-Libpng 1.0.3 - January 14, 1999
+Libpng 1.2.4 - July 8, 2002
This is a public release of libpng, intended for use in production codes.
-Changes since the previous public release (1.0.2):
-
-libpng-1.0.3:
-
- Replaced and extended code that was removed from png_set_filler() in 1.0.1a.
- Fixed a bug in png_do_filler() that made it fail to write filler bytes in
- the left-most pixel of each row (Kevin Bracey).
- Changed "static pngcharp tIME_string" to "static char tIME_string[30]"
- in pngtest.c (Duncan Simpson).
- Fixed a bug in pngtest.c that caused pngtest to try to write a tIME chunk
- even when no tIME chunk was present in the source file.
- Fixed a problem in pngrutil.c: gray_to_rgb didn't always work with 16-bit.
- Fixed a problem in png_read_push_finish_row(), which would not skip some
- passes that it should skip, for images that are less than 3 pixels high.
- Interchanged the order of calls to png_do_swap() and png_do_shift()
- in pngwtran.c (John Cromer).
- Added #ifdef PNG_DEBUG/#endif surrounding use of PNG_DEBUG in png.h .
- Changed "bad adaptive filter type" from error to warning in pngrutil.c .
- Fixed a documentation error about default filtering with 8-bit indexed-color.
- Separated the PNG_NO_STDIO macro into PNG_NO_STDIO and PNG_NO_CONSOLE_IO
- (L. Peter Deutsch).
- Added png_set_rgb_to_gray() and png_get_rgb_to_gray_status() functions.
- Added png_get_copyright() and png_get_header_version() functions.
- Revised comments on png_set_progressive_read_fn() in libpng.txt and example.c
- Added information about debugging in libpng.txt and libpng.3 .
- Changed "ln -sf" to "ln -s -f" in makefile.s2x, makefile.lnx, and makefile.sco.
- Removed lines after Dynamic Dependencies" in makefile.aco .
- Revised makefile.dec to make a shared library (Jeremie Petit).
- Removed trailing blanks from all files.
- Removed misplaced #endif and #ifdef PNG_NO_EXTERN near the end of png.h
- Added "if" tests to silence complaints about unused png_ptr in png.h and png.c
- Changed "check_if_png" function in example.c to return true (nonzero) if PNG.
- Changed libpng.txt to demonstrate png_sig_cmp() instead of png_check_sig()
- which is obsolete.
- Added makefile.hux, for Hewlett Packard HPUX 10.20 and 11.00 (Jim Rice)
- Added a statement of Y2K compliance in png.h, libpng.1, and Y2KINFO.
+Changes since the last public release (1.2.3):
+
+ Added libpng.pc and libpng-config to "all:" target in 16 makefiles.
+ Fixed bug in 16 makefiles: $(DESTDIR)/$(LIBPATH) to $(DESTDIR)$(LIBPATH)
+ Added missing "\" before closing double quote in makefile.gcmmx.
+ Plugged various memory leaks; added png_malloc_warn() and png_set_text_2()
+ functions.
+ Plugged memory leak of png_ptr->current_text (Matt Holgate).
+ Check for buffer overflow before reading CRC in pngpread.c (Warwick Allison)
+ Added -soname to the loader flags in makefile.dec, makefile.sgi, and
+ makefile.sggcc.
+ Added "test-installed" targets to makefile.linux, makefile.gcmmx,
+ makefile.sgi, makefile.sggcc, makefile.32sunu, makefile.64sunu,
+ makefile.beos, makefile.darwin, makefile.dec, makefile.macosx,
+ makefile.solaris, makefile.sco, makefile.cygwin, makefile.hpux,
+ makefile.hpgcc, and makefile.so9.
+ Plugged memory leak of row_buf in pngtest.c when there is a png_error().
+ Detect buffer overflow in pngpread.c when IDAT is corrupted with extra data.
+ Revised pnggccrd.c to be able to back out version 1.0.x via PNG_1_0_X macro.
+ Changed png_warning() to png_error() when width is too large to process.
Send comments/corrections/commendations to
-png-implement@dworkin.wustl.edu or to randeg@alumni.rpi.edu
+png-implement@ccrc.wustl.edu or to randeg@alum.rpi.edu
Glenn R-P
-
-Send comments/corrections/commendations to
-png-implement@dworkin.wustl.edu or to randeg@alumni.rpi.edu
-
-Glenn Randers-Pehrson
-libpng maintainer
-PNG Development Group
+
CHANGES - changes for libpng
version 0.2
- all chunk handling routines have the same prototypes, so we will
be able to handle all chunks via a callback mechanism
try to fix Linux "setjmp" buffer size problems
+ removed png_large_malloc, png_large_free, and png_realloc functions.
version 0.95 [March, 1997]
fixed bug in pngwutil.c allocating "up_row" twice and "avg_row" never
fixed bug in PNG file signature compares when start != 0
Minor changes to previous minor changes to pngtest.c
Changed PNG_READ_NOT_FULLY_SUPPORTED to PNG_READ_TRANSFORMS_NOT_SUPPORTED
and added PNG_PROGRESSIVE_READ_NOT_SUPPORTED macro
+ Added user transform capability
version 1.00 [March 7, 1998]
Changed several typedefs in pngrutil.c
Added makefile.wat (Pawel Mrochen), updated makefile.tc3 (Willem van Schaik)
Changed "ln -sf" to "ln -s -f" in makefile.s2x, makefile.lnx, and makefile.sco.
Removed lines after Dynamic Dependencies" in makefile.aco .
Revised makefile.dec to make a shared library (Jeremie Petit).
- Removed trailing blanks from all files.
+ Removed trailing blanks from all files.
version 1.0.2a [January 6, 1999]
Removed misplaced #endif and #ifdef PNG_NO_EXTERN near the end of png.h
Added "if" tests to silence complaints about unused png_ptr in png.h and png.c
which is obsolete.
version 1.0.3 [January 14, 1999]
Added makefile.hux, for Hewlett Packard HPUX 10.20 and 11.00 (Jim Rice)
- Added a statement of Y2K compliance in png.h, libpng.1, and Y2KINFO.
+ Added a statement of Y2K compliance in png.h, libpng.3, and Y2KINFO.
+version 1.0.3a [August 12, 1999]
+ Added check for PNG_READ_INTERLACE_SUPPORTED in pngread.c; issue a warning
+ if an attempt is made to read an interlaced image when it's not supported.
+ Added check if png_ptr->trans is defined before freeing it in pngread.c
+ Modified the Y2K statement to include versions back to version 0.71
+ Fixed a bug in the check for valid IHDR bit_depth/color_types in pngrutil.c
+ Modified makefile.wat (added -zp8 flag, ".symbolic", changed some comments)
+ Replaced leading blanks with tab characters in makefile.hux
+ Changed "dworkin.wustl.edu" to "ccrc.wustl.edu" in various documents.
+ Changed (float)red and (float)green to (double)red, (double)green
+ in png_set_rgb_to_gray() to avoid "promotion" problems in AIX.
+ Fixed a bug in pngconf.h that omitted <stdio.h> when PNG_DEBUG==0 (K Bracey).
+ Reformatted libpng.3 and libpngpf.3 with proper fonts (script by J. vanZandt).
+ Updated documentation to refer to the PNG-1.2 specification.
+ Removed ansi2knr.c and left pointers to the latest source for ansi2knr.c
+ in makefile.knr, INSTALL, and README (L. Peter Deutsch)
+ Fixed bugs in calculation of the length of rowbytes when adding alpha
+ channels to 16-bit images, in pngrtran.c (Chris Nokleberg)
+ Added function png_set_user_transform_info() to store user_transform_ptr,
+ user_depth, and user_channels into the png_struct, and a function
+ png_get_user_transform_ptr() to retrieve the pointer (Chris Nokleberg)
+ Added function png_set_empty_plte_permitted() to make libpng useable
+ in MNG applications.
+ Corrected the typedef for png_free_ptr in png.h (Jesse Jones).
+ Correct gamma with srgb is 45455 instead of 45000 in pngrutil.c, to be
+ consistent with PNG-1.2, and allow variance of 500 before complaining.
+ Added assembler code contributed by Intel in file pngvcrd.c and modified
+ makefile.w32 to use it (Nirav Chhatrapati, INTEL Corporation, Gilles Vollant)
+ Changed "ln -s -f" to "ln -f -s" in the makefiles to make Solaris happy.
+ Added some aliases for png_set_expand() in pngrtran.c, namely
+ png_set_expand_PLTE(), png_set_expand_depth(), and png_set_expand_tRNS()
+ (Greg Roelofs, in "PNG: The Definitive Guide").
+ Added makefile.beo for BEOS on X86, contributed by Sander Stok.
+version 1.0.3b [August 26, 1999]
+ Replaced 2147483647L several places with PNG_MAX_UINT macro, defined in png.h
+ Changed leading blanks to tabs in all makefiles.
+ Define PNG_USE_PNGVCRD in makefile.w32, to get MMX assembler code.
+ Made alternate versions of png_set_expand() in pngrtran.c, namely
+ png_set_gray_1_2_4_to_8, png_set_palette_to_rgb, and png_set_tRNS_to_alpha
+ (Greg Roelofs, in "PNG: The Definitive Guide"). Deleted the 1.0.3a aliases.
+ Relocated start of 'extern "C"' block in png.h so it doesn't include pngconf.h
+ Revised calculation of num_blocks in pngmem.c to avoid a potentially
+ negative shift distance, whose results are undefined in the C language.
+ Added a check in pngset.c to prevent writing multiple tIME chunks.
+ Added a check in pngwrite.c to detect invalid small window_bits sizes.
+version 1.0.3d [September 4, 1999]
+ Fixed type casting of igamma in pngrutil.c
+ Added new png_expand functions to scripts/pngdef.pas and pngos2.def
+ Added a demo read_user_transform_fn that examines the row filters in pngtest.c
+version 1.0.4 [September 24, 1999]
+ Define PNG_ALWAYS_EXTERN in pngconf.h if __STDC__ is defined
+ Delete #define PNG_INTERNAL and include "png.h" from pngasmrd.h
+ Made several minor corrections to pngtest.c
+ Renamed the makefiles with longer but more user friendly extensions.
+ Copied the PNG copyright and license to a separate LICENSE file.
+ Revised documentation, png.h, and example.c to remove reference to
+ "viewing_gamma" which no longer appears in the PNG specification.
+ Revised pngvcrd.c to use MMX code for interlacing only on the final pass.
+ Updated pngvcrd.c to use the faster C filter algorithms from libpng-1.0.1a
+ Split makefile.win32vc into two versions, makefile.vcawin32 (uses MMX
+ assembler code) and makefile.vcwin32 (doesn't).
+ Added a CPU timing report to pngtest.c (enabled by defining PNGTEST_TIMING)
+ Added a copy of pngnow.png to the distribution.
+version 1.0.4a [September 25, 1999]
+ Increase max_pixel_depth in pngrutil.c if a user transform needs it.
+ Changed several division operations to right-shifts in pngvcrd.c
+version 1.0.4b [September 30, 1999]
+ Added parentheses in line 3732 of pngvcrd.c
+ Added a comment in makefile.linux warning about buggy -O3 in pgcc 2.95.1
+version 1.0.4c [October 1, 1999]
+ Added a "png_check_version" function in png.c and pngtest.c that will generate
+ a helpful compiler error if an old png.h is found in the search path.
+ Changed type of png_user_transform_depth|channels from int to png_byte.
+version 1.0.4d [October 6, 1999]
+ Changed 0.45 to 0.45455 in png_set_sRGB()
+ Removed unused PLTE entries from pngnow.png
+ Re-enabled some parts of pngvcrd.c (png_combine_row) that work properly.
+version 1.0.4e [October 10, 1999]
+ Fixed sign error in pngvcrd.c (Greg Roelofs)
+ Replaced some instances of memcpy with simple assignments in pngvcrd (GR-P)
+version 1.0.4f [October 15, 1999]
+ Surrounded example.c code with #if 0 .. #endif to prevent people from
+ inadvertently trying to compile it.
+ Changed png_get_header_version() from a function to a macro in png.h
+ Added type casting mostly in pngrtran.c and pngwtran.c
+ Removed some pointless "ptr = NULL" in pngmem.c
+ Added a "contrib" directory containing the source code from Greg's book.
+version 1.0.5 [October 15, 1999]
+ Minor editing of the INSTALL and README files.
+version 1.0.5a [October 23, 1999]
+ Added contrib/pngsuite and contrib/pngminus (Willem van Schaik)
+ Fixed a typo in the png_set_sRGB() function call in example.c (Jan Nijtmans)
+ Further optimization and bugfix of pngvcrd.c
+ Revised pngset.c so that it does not allocate or free memory in the user's
+ text_ptr structure. Instead, it makes its own copy.
+ Created separate write_end_info_struct in pngtest.c for a more severe test.
+ Added code in pngwrite.c to free info_ptr->text[i].key to stop a memory leak.
+version 1.0.5b [November 23, 1999]
+ Moved PNG_FLAG_HAVE_CHUNK_HEADER, PNG_FLAG_BACKGROUND_IS_GRAY and
+ PNG_FLAG_WROTE_tIME from flags to mode.
+ Added png_write_info_before_PLTE() function.
+ Fixed some typecasting in contrib/gregbook/*.c
+ Updated scripts/makevms.com and added makevms.com to contrib/gregbook
+ and contrib/pngminus (Martin Zinser)
+version 1.0.5c [November 26, 1999]
+ Moved png_get_header_version from png.h to png.c, to accomodate ansi2knr.
+ Removed all global arrays (according to PNG_NO_GLOBAL_ARRAYS macro), to
+ accomodate making DLL's: Moved usr_png_ver from global variable to function
+ png_get_header_ver() in png.c. Moved png_sig to png_sig_bytes in png.c and
+ eliminated use of png_sig in pngwutil.c. Moved the various png_CHNK arrays
+ into pngtypes.h. Eliminated use of global png_pass arrays. Declared the
+ png_CHNK and png_pass arrays to be "const". Made the global arrays
+ available to applications (although none are used in libpng itself) when
+ PNG_NO_GLOBAL_ARRAYS is not defined or when PNG_GLOBAL_ARRAYS is defined.
+ Removed some extraneous "-I" from contrib/pngminus/makefile.std
+ Changed the PNG_sRGB_INTENT macros in png.h to be consistent with PNG-1.2.
+ Change PNG_SRGB_INTENT to PNG_sRGB_INTENT in libpng.txt and libpng.3
+version 1.0.5d [November 29, 1999]
+ Add type cast (png_const_charp) two places in png.c
+ Eliminated pngtypes.h; use macros instead to declare PNG_CHNK arrays.
+ Renamed "PNG_GLOBAL_ARRAYS" to "PNG_USE_GLOBAL_ARRAYS" and made available
+ to applications a macro "PNG_USE_LOCAL_ARRAYS".
+ #ifdef out all the new declarations when PNG_USE_GLOBAL_ARRAYS is defined.
+ Added PNG_EXPORT_VAR macro to accommodate making DLL's.
+version 1.0.5e [November 30, 1999]
+ Added iCCP, iTXt, and sPLT support; added "lang" member to the png_text
+ structure; refactored the inflate/deflate support to make adding new chunks
+ with trailing compressed parts easier in the future, and added new functions
+ png_free_iCCP, png_free_pCAL, png_free_sPLT, png_free_text, png_get_iCCP,
+ png_get_spalettes, png_set_iCCP, png_set_spalettes (Eric S. Raymond).
+ NOTE: Applications that write text chunks MUST define png_text->lang
+ before calling png_set_text(). It must be set to NULL if you want to
+ write tEXt or zTXt chunks. If you want your application to be able to
+ run with older versions of libpng, use
+
+ #ifdef PNG_iTXt_SUPPORTED
+ png_text[i].lang = NULL;
+ #endif
+
+ Changed png_get_oFFs() and png_set_oFFs() to use signed rather than unsigned
+ offsets (Eric S. Raymond).
+ Combined PNG_READ_cHNK_SUPPORTED and PNG_WRITE_cHNK_SUPPORTED macros into
+ PNG_cHNK_SUPPORTED and combined the three types of PNG_text_SUPPORTED
+ macros, leaving the separate macros also available.
+ Removed comments on #endifs at the end of many short, non-nested #if-blocks.
+version 1.0.5f [December 6, 1999]
+ Changed makefile.solaris to issue a warning about potential problems when
+ the ucb "ld" is in the path ahead of the ccs "ld".
+ Removed "- [date]" from the "synopsis" line in libpng.3 and libpngpf.3.
+ Added sCAL chunk support (Eric S. Raymond).
+version 1.0.5g [December 7, 1999]
+ Fixed "png_free_spallettes" typo in png.h
+ Added code to handle new chunks in pngpread.c
+ Moved PNG_CHNK string macro definitions outside of PNG_NO_EXTERN block
+ Added "translated_key" to png_text structure and png_write_iTXt().
+ Added code in pngwrite.c to work around a newly discovered zlib bug.
+version 1.0.5h [December 10, 1999]
+ NOTE: regarding the note for version 1.0.5e, the following must also
+ be included in your code:
+ png_text[i].translated_key = NULL;
+ Unknown chunk handling is now supported.
+ Option to eliminate all floating point support was added. Some new
+ fixed-point functions such as png_set_gAMA_fixed() were added.
+ Expanded tabs and removed trailing blanks in source files.
+version 1.0.5i [December 13, 1999]
+ Added some type casts to silence compiler warnings.
+ Renamed "png_free_spalette" to "png_free_spalettes" for consistency.
+ Removed leading blanks from a #define in pngvcrd.c
+ Added some parameters to the new png_set_keep_unknown_chunks() function.
+ Added a test for up->location != 0 in the first instance of writing
+ unknown chunks in pngwrite.c
+ Changed "num" to "i" in png_free_spalettes() and png_free_unknowns() to
+ prevent recursion.
+ Added png_free_hIST() function.
+ Various patches to fix bugs in the sCAL and integer cHRM processing,
+ and to add some convenience macros for use with sCAL.
+version 1.0.5j [December 21, 1999]
+ Changed "unit" parameter of png_write_sCAL from png_byte to int, to work
+ around buggy compilers.
+ Added new type "png_fixed_point" for integers that hold float*100000 values
+ Restored backward compatibility of tEXt/zTXt chunk processing:
+ Restored the first four members of png_text to the same order as v.1.0.5d.
+ Added members "lang_key" and "itxt_length" to png_text struct. Set
+ text_length=0 when "text" contains iTXt data. Use the "compression"
+ member to distinguish among tEXt/zTXt/iTXt types. Added
+ PNG_ITXT_COMPRESSION_NONE (1) and PNG_ITXT_COMPRESSION_zTXt(2) macros.
+ The "Note" above, about backward incompatibility of libpng-1.0.5e, no
+ longer applies.
+ Fixed png_read|write_iTXt() to read|write parameters in the right order,
+ and to write the iTXt chunk after IDAT if it appears in the end_ptr.
+ Added pnggccrd.c, version of pngvcrd.c Intel assembler for gcc (Greg Roelofs)
+ Reversed the order of trying to write floating-point and fixed-point gAMA.
+version 1.0.5k [December 27, 1999]
+ Added many parentheses, e.g., "if (a && b & c)" becomes "if (a && (b & c))"
+ Added png_handle_as_unknown() function (Glenn)
+ Added png_free_chunk_list() function and chunk_list and num_chunk_list members
+ of png_ptr.
+ Eliminated erroneous warnings about multiple sPLT chunks and sPLT-after-PLTE.
+ Fixed a libpng-1.0.5h bug in pngrutil.c that was issuing erroneous warnings
+ about ignoring incorrect gAMA with sRGB (gAMA was in fact not ignored)
+ Added png_free_tRNS(); png_set_tRNS() now malloc's its own trans array (ESR).
+ Define png_get_int_32 when oFFs chunk is supported as well as when pCAL is.
+ Changed type of proflen from png_int_32 to png_uint_32 in png_get_iCCP().
+version 1.0.5l [January 1, 2000]
+ Added functions png_set_read_user_chunk_fn() and png_get_user_chunk_ptr()
+ for setting a callback function to handle unknown chunks and for
+ retrieving the associated user pointer (Glenn).
+version 1.0.5m [January 7, 2000]
+ Added high-level functions png_read_png(), png_write_png(), png_free_pixels().
+version 1.0.5n [January 9, 2000]
+ Added png_free_PLTE() function, and modified png_set_PLTE() to malloc its
+ own memory for info_ptr->palette. This makes it safe for the calling
+ application to free its copy of the palette any time after it calls
+ png_set_PLTE().
+version 1.0.5o [January 20, 2000]
+ Cosmetic changes only (removed some trailing blanks and TABs)
+version 1.0.5p [January 31, 2000]
+ Renamed pngdll.mak to makefile.bd32
+ Cosmetic changes in pngtest.c
+version 1.0.5q [February 5, 2000]
+ Relocated the makefile.solaris warning about PATH problems.
+ Fixed pngvcrd.c bug by pushing/popping registers in mmxsupport (Bruce Oberg)
+ Revised makefile.gcmmx
+ Added PNG_SETJMP_SUPPORTED, PNG_SETJMP_NOT_SUPPORTED, and PNG_ABORT() macros
+version 1.0.5r [February 7, 2000]
+ Removed superfluous prototype for png_get_itxt from png.h
+ Fixed a bug in pngrtran.c that improperly expanded the background color.
+ Return *num_text=0 from png_get_text() when appropriate, and fix documentation
+ of png_get_text() in libpng.txt/libpng.3.
+version 1.0.5s [February 18, 2000]
+ Added "png_jmp_env()" macro to pngconf.h, to help people migrate to the
+ new error handler that's planned for the next libpng release, and changed
+ example.c, pngtest.c, and contrib programs to use this macro.
+ Revised some of the DLL-export macros in pngconf.h (Greg Roelofs)
+ Fixed a bug in png_read_png() that caused it to fail to expand some images
+ that it should have expanded.
+ Fixed some mistakes in the unused and undocumented INCH_CONVERSIONS functions
+ in pngget.c
+ Changed the allocation of palette, history, and trans arrays back to
+ the version 1.0.5 method (linking instead of copying) which restores
+ backward compatibility with version 1.0.5. Added some remarks about
+ that in example.c. Added "free_me" member to info_ptr and png_ptr
+ and added png_free_data() function.
+ Updated makefile.linux and makefile.gccmmx to make directories conditionally.
+ Made cosmetic changes to pngasmrd.h
+ Added png_set_rows() and png_get_rows(), for use with png_read|write_png().
+ Modified png_read_png() to allocate info_ptr->row_pointers only if it
+ hasn't already been allocated.
+version 1.0.5t [March 4, 2000]
+ Changed png_jmp_env() migration aiding macro to png_jmpbuf().
+ Fixed "interlace" typo (should be "interlaced") in contrib/gregbook/read2-x.c
+ Fixed bug with use of PNG_BEFORE_IHDR bit in png_ptr->mode, introduced when
+ PNG_FLAG_HAVE_CHUNK_HEADER was moved into png_ptr->mode in version 1.0.5b
+ Files in contrib/gregbook were revised to use png_jmpbuf() and to select
+ a 24-bit visual if one is available, and to allow abbreviated options.
+ Files in contrib/pngminus were revised to use the png_jmpbuf() macro.
+ Removed spaces in makefile.linux and makefile.gcmmx, introduced in 1.0.5s
+version 1.0.5u [March 5, 2000]
+ Simplified the code that detects old png.h in png.c and pngtest.c
+ Renamed png_spalette (_p, _pp) to png_sPLT_t (_tp, _tpp)
+ Increased precision of rgb_to_gray calculations from 8 to 15 bits and
+ added png_set_rgb_to_gray_fixed() function.
+ Added makefile.bc32 (32-bit Borland C++, C mode)
+version 1.0.5v [March 11, 2000]
+ Added some parentheses to the png_jmpbuf macro definition.
+ Updated references to the zlib home page, which has moved to freesoftware.com.
+ Corrected bugs in documentation regarding png_read_row() and png_write_row().
+ Updated documentation of png_rgb_to_gray calculations in libpng.3/libpng.txt.
+ Renamed makefile.borland,turboc3 back to makefile.bor,tc3 as in version 1.0.3,
+ revised borland makefiles; added makefile.ibmvac3 and makefile.gcc (Cosmin)
+version 1.0.6 [March 20, 2000]
+ Minor revisions of makefile.bor, libpng.txt, and gregbook/rpng2-win.c
+ Added makefile.sggcc (SGI IRIX with gcc)
+version 1.0.6d [April 7, 2000]
+ Changed sprintf() to strcpy() in png_write_sCAL_s() to work without STDIO
+ Added data_length parameter to png_decompress_chunk() function
+ Revised documentation to remove reference to abandoned png_free_chnk functions
+ Fixed an error in png_rgb_to_gray_fixed()
+ Revised example.c, usage of png_destroy_write_struct().
+ Renamed makefile.ibmvac3 to makefile.ibmc, added libpng.icc IBM project file
+ Added a check for info_ptr->free_me&PNG_FREE_TEXT when freeing text in png.c
+ Simplify png_sig_bytes() function to remove use of non-ISO-C strdup().
+version 1.0.6e [April 9, 2000]
+ Added png_data_freer() function.
+ In the code that checks for over-length tRNS chunks, added check of
+ info_ptr->num_trans as well as png_ptr->num_trans (Matthias Benckmann)
+ Minor revisions of libpng.txt/libpng.3.
+ Check for existing data and free it if the free_me flag is set, in png_set_*()
+ and png_handle_*().
+ Only define PNG_WEIGHTED_FILTERS_SUPPORTED when PNG_FLOATING_POINT_SUPPORTED
+ is defined.
+ Changed several instances of PNG_NO_CONSOLE_ID to PNG_NO_STDIO in pngrutil.c
+ and mentioned the purposes of the two macros in libpng.txt/libpng.3.
+version 1.0.6f [April 14, 2000]
+ Revised png_set_iCCP() and png_set_rows() to avoid prematurely freeing data.
+ Add checks in png_set_text() for NULL members of the input text structure.
+ Revised libpng.txt/libpng.3.
+ Removed superfluous prototype for png_set_itxt from png.h
+ Removed "else" from pngread.c, after png_error(), and changed "0" to "length".
+ Changed several png_errors about malformed ancillary chunks to png_warnings.
+version 1.0.6g [April 24, 2000]
+ Added png_pass-* arrays to pnggccrd.c when PNG_USE_LOCAL_ARRAYS is defined.
+ Relocated paragraph about png_set_background() in libpng.3/libpng.txt
+ and other revisions (Matthias Benckmann)
+ Relocated info_ptr->free_me, png_ptr->free_me, and other info_ptr and
+ png_ptr members to restore binary compatibility with libpng-1.0.5
+ (breaks compatibility with libpng-1.0.6).
+version 1.0.6h [April 24, 2000]
+ Changed shared library so-number pattern from 2.x.y.z to xy.z (this builds
+ libpng.so.10 & libpng.so.10.6h instead of libpng.so.2 & libpng.so.2.1.0.6h)
+ This is a temporary change for test purposes.
+version 1.0.6i [May 2, 2000]
+ Rearranged some members at the end of png_info and png_struct, to put
+ unknown_chunks_num and free_me within the original size of the png_structs
+ and free_me, png_read_user_fn, and png_free_fn within the original png_info,
+ because some old applications allocate the structs directly instead of
+ using png_create_*().
+ Added documentation of user memory functions in libpng.txt/libpng.3
+ Modified png_read_png so that it will use user_allocated row_pointers
+ if present, unless free_me directs that it be freed, and added description
+ of the use of png_set_rows() and png_get_rows() in libpng.txt/libpng.3.
+ Added PNG_LEGACY_SUPPORTED macro, and #ifdef out all new (since version
+ 1.00) members of png_struct and png_info, to regain binary compatibility
+ when you define this macro. Capabilities lost in this event
+ are user transforms (new in version 1.0.0),the user transform pointer
+ (new in version 1.0.2), rgb_to_gray (new in 1.0.5), iCCP, sCAL, sPLT,
+ the high-level interface, and unknown chunks support (all new in 1.0.6).
+ This was necessary because of old applications that allocate the structs
+ directly as authors were instructed to do in libpng-0.88 and earlier,
+ instead of using png_create_*().
+ Added modes PNG_CREATED_READ_STRUCT and PNG_CREATED_WRITE_STRUCT which
+ can be used to detect codes that directly allocate the structs, and
+ code to check these modes in png_read_init() and png_write_init() and
+ generate a libpng error if the modes aren't set and PNG_LEGACY_SUPPORTED
+ was not defined.
+ Added makefile.intel and updated makefile.watcom (Pawel Mrochen)
+version 1.0.6j [May 3, 2000]
+ Overloaded png_read_init() and png_write_init() with macros that convert
+ calls to png_read_init_2() or png_write_init_2() that check the version
+ and structure sizes.
+version 1.0.7beta11 [May 7, 2000]
+ Removed the new PNG_CREATED_READ_STRUCT and PNG_CREATED_WRITE_STRUCT modes
+ which are no longer used.
+ Eliminated the three new members of png_text when PNG_LEGACY_SUPPORTED is
+ defined or when neither PNG_READ_iTXt_SUPPORTED nor PNG_WRITE_iTXT_SUPPORTED
+ is defined.
+ Made PNG_NO_READ|WRITE_iTXt the default setting, to avoid memory
+ overrun when old applications fill the info_ptr->text structure directly.
+ Added PNGAPI macro, and added it to the definitions of all exported functions.
+ Relocated version macro definitions ahead of the includes of zlib.h and
+ pngconf.h in png.h.
+version 1.0.7beta12 [May 12, 2000]
+ Revised pngset.c to avoid a problem with expanding the png_debug macro.
+ Deleted some extraneous defines from pngconf.h
+ Made PNG_NO_CONSOLE_IO the default condition when PNG_BUILD_DLL is defined.
+ Use MSC _RPTn debugging instead of fprintf if _MSC_VER is defined.
+ Added png_access_version_number() function.
+ Check for mask&PNG_FREE_CHNK (for TEXT, SCAL, PCAL) in png_free_data().
+ Expanded libpng.3/libpng.txt information about png_data_freer().
+version 1.0.7beta14 [May 17, 2000] (beta13 was not published)
+ Changed pnggccrd.c and pngvcrd.c to handle bad adaptive filter types as
+ warnings instead of errors, as pngrutil.c does.
+ Set the PNG_INFO_IDAT valid flag in png_set_rows() so png_write_png()
+ will actually write IDATs.
+ Made the default PNG_USE_LOCAL_ARRAYS depend on PNG_DLL instead of WIN32.
+ Make png_free_data() ignore its final parameter except when freeing data
+ that can have multiple instances (text, sPLT, unknowns).
+ Fixed a new bug in png_set_rows().
+ Removed info_ptr->valid tests from png_free_data(), as in version 1.0.5.
+ Added png_set_invalid() function.
+ Fixed incorrect illustrations of png_destroy_write_struct() in example.c.
+version 1.0.7beta15 [May 30, 2000]
+ Revised the deliberately erroneous Linux setjmp code in pngconf.h to produce
+ fewer error messages.
+ Rearranged checks for Z_OK to check the most likely path first in pngpread.c
+ and pngwutil.c.
+ Added checks in pngtest.c for png_create_*() returning NULL, and mentioned
+ in libpng.txt/libpng.3 the need for applications to check this.
+ Changed names of png_default_*() functions in pngtest to pngtest_*().
+ Changed return type of png_get_x|y_offset_*() from png_uint_32 to png_int_32.
+ Fixed some bugs in the unused PNG_INCH_CONVERSIONS functions in pngget.c
+ Set each pointer to NULL after freeing it in png_free_data().
+ Worked around a problem in pngconf.h; AIX's strings.h defines an "index"
+ macro that conflicts with libpng's png_color_16.index. (Dimitri Papadapoulos)
+ Added "msvc" directory with MSVC++ project files (Simon-Pierre Cadieux).
+version 1.0.7beta16 [June 4, 2000]
+ Revised the workaround of AIX string.h "index" bug.
+ Added a check for overlength PLTE chunk in pngrutil.c.
+ Added PNG_NO_POINTER_INDEXING macro to use array-indexing instead of pointer
+ indexing in pngrutil.c and pngwutil.c to accommodate a buggy compiler.
+ Added a warning in png_decompress_chunk() when it runs out of data, e.g.
+ when it tries to read an erroneous PhotoShop iCCP chunk.
+ Added PNG_USE_DLL macro.
+ Revised the copyright/disclaimer/license notice.
+ Added contrib/msvctest directory
+version 1.0.7rc1 [June 9, 2000]
+ Corrected the definition of PNG_TRANSFORM_INVERT_ALPHA (0x0400 not 0x0200)
+ Added contrib/visupng directory (Willem van Schaik)
+version 1.0.7beta18 [June 23, 2000]
+ Revised PNGAPI definition, and pngvcrd.c to work with __GCC__
+ and do not redefine PNGAPI if it is passed in via a compiler directive.
+ Revised visupng/PngFile.c to remove returns from within the Try block.
+ Removed leading underscores from "_PNG_H" and "_PNG_SAVE_BSD_SOURCE" macros.
+ Updated contrib/visupng/cexcept.h to version 1.0.0.
+ Fixed bugs in pngwrite.c and pngwutil.c that prevented writing iCCP chunks.
+version 1.0.7rc2 [June 28, 2000]
+ Updated license to include disclaimers required by UCITA.
+ Fixed "DJBPP" typo in pnggccrd.c introduced in beta18.
+version 1.0.7 [July 1, 2000]
+ Revised the definition of "trans_values" in libpng.3/libpng.txt
+version 1.0.8beta1 [July 8, 2000]
+ Added png_free(png_ptr, key) two places in pngpread.c to stop memory leaks.
+ Changed PNG_NO_STDIO to PNG_NO_CONSOLE_IO, several places in pngrutil.c and
+ pngwutil.c.
+ Changed PNG_EXPORT_VAR to use PNG_IMPEXP, in pngconf.h.
+ Removed unused "#include <assert.h>" from png.c
+ Added WindowsCE support.
+ Revised pnggccrd.c to work with gcc-2.95.2 and in the Cygwin environment.
+version 1.0.8beta2 [July 10, 2000]
+ Added project files to the wince directory and made further revisions
+ of pngtest.c, pngrio.c, and pngwio.c in support of WindowsCE.
+version 1.0.8beta3 [July 11, 2000]
+ Only set the PNG_FLAG_FREE_TRNS or PNG_FREE_TRNS flag in png_handle_tRNS()
+ for indexed-color input files to avoid potential double-freeing trans array
+ under some unusual conditions; problem was introduced in version 1.0.6f.
+ Further revisions to pngtest.c and files in the wince subdirectory.
+version 1.0.8beta4 [July 14, 2000]
+ Added the files pngbar.png and pngbar.jpg to the distribution.
+ Added makefile.cygwin, and cygwin support in pngconf.h
+ Added PNG_NO_ZALLOC_ZERO macro (makes png_zalloc skip zeroing memory)
+version 1.0.8rc1 [July 16, 2000]
+ Revised png_debug() macros and statements to eliminate compiler warnings.
+version 1.0.8 [July 24, 2000]
+ Added png_flush() in pngwrite.c, after png_write_IEND().
+ Updated makefile.hpux to build a shared library.
+version 1.0.9beta1 [November 10, 2000]
+ Fixed typo in scripts/makefile.hpux
+ Updated makevms.com in scripts and contrib/* and contrib/* (Martin Zinser)
+ Fixed seqence-point bug in contrib/pngminus/png2pnm (Martin Zinser)
+ Changed "cdrom.com" in documentation to "libpng.org"
+ Revised pnggccrd.c to get it all working, and updated makefile.gcmmx (Greg).
+ Changed type of "params" from voidp to png_voidp in png_read|write_png().
+ Make sure PNGAPI and PNG_IMPEXP are defined in pngconf.h.
+ Revised the 3 instances of WRITEFILE in pngtest.c.
+ Relocated "msvc" and "wince" project subdirectories into "dll" subdirectory.
+ Updated png.rc in dll/msvc project
+ Revised makefile.dec to define and use LIBPATH and INCPATH
+ Increased size of global png_libpng_ver[] array from 12 to 18 chars.
+ Made global png_libpng_ver[], png_sig[] and png_pass_*[] arrays const.
+ Removed duplicate png_crc_finish() from png_handle_bKGD() function.
+ Added a warning when application calls png_read_update_info() multiple times.
+ Revised makefile.cygwin
+ Fixed bugs in iCCP support in pngrutil.c and pngwutil.c.
+ Replaced png_set_empty_plte_permitted() with png_permit_mng_features().
+version 1.0.9beta2 [November 19, 2000]
+ Renamed the "dll" subdirectory "projects".
+ Added borland project files to "projects" subdirectory.
+ Set VS_FF_PRERELEASE and VS_FF_PATCHED flags in msvc/png.rc when appropriate.
+ Add error message in png_set_compression_buffer_size() when malloc fails.
+version 1.0.9beta3 [November 23, 2000]
+ Revised PNG_LIBPNG_BUILD_TYPE macro in png.h, used in the msvc project.
+ Removed the png_flush() in pngwrite.c that crashes some applications
+ that don't set png_output_flush_fn.
+ Added makefile.macosx and makefile.aix to scripts directory.
+version 1.0.9beta4 [December 1, 2000]
+ Change png_chunk_warning to png_warning in png_check_keyword().
+ Increased the first part of msg buffer from 16 to 18 in png_chunk_error().
+version 1.0.9beta5 [December 15, 2000]
+ Added support for filter method 64 (for PNG datastreams embedded in MNG).
+version 1.0.9beta6 [December 18, 2000]
+ Revised png_set_filter() to accept filter method 64 when appropriate.
+ Added new PNG_HAVE_PNG_SIGNATURE bit to png_ptr->mode and use it to
+ help prevent applications from using MNG features in PNG datastreams.
+ Added png_permit_mng_features() function.
+ Revised libpng.3/libpng.txt. Changed "filter type" to "filter method".
+version 1.0.9rc1 [December 23, 2000]
+ Revised test for PNG_HAVE_PNG_SIGNATURE in pngrutil.c
+ Fixed error handling of unknown compression type in png_decompress_chunk().
+ In pngconf.h, define __cdecl when _MSC_VER is defined.
+version 1.0.9beta7 [December 28, 2000]
+ Changed PNG_TEXT_COMPRESSION_zTXt to PNG_COMPRESSION_TYPE_BASE several places.
+ Revised memory management in png_set_hIST and png_handle_hIST in a backward
+ compatible manner. PLTE and tRNS were revised similarly.
+ Revised the iCCP chunk reader to ignore trailing garbage.
+version 1.0.9beta8 [January 12, 2001]
+ Moved pngasmrd.h into pngconf.h.
+ Improved handling of out-of-spec garbage iCCP chunks generated by PhotoShop.
+version 1.0.9beta9 [January 15, 2001]
+ Added png_set_invalid, png_permit_mng_features, and png_mmx_supported to
+ wince and msvc project module definition files.
+ Minor revision of makefile.cygwin.
+ Fixed bug with progressive reading of narrow interlaced images in pngpread.c
+version 1.0.9beta10 [January 16, 2001]
+ Do not typedef png_FILE_p in pngconf.h when PNG_NO_STDIO is defined.
+ Fixed "png_mmx_supported" typo in project definition files.
+version 1.0.9beta11 [January 19, 2001]
+ Updated makefile.sgi to make shared library.
+ Removed png_mmx_support() function and disabled PNG_MNG_FEATURES_SUPPORTED
+ by default, for the benefit of DLL forward compatibility. These will
+ be re-enabled in version 1.2.0.
+version 1.0.9rc2 [January 22, 2001]
+ Revised cygwin support.
+version 1.0.9 [January 31, 2001]
+ Added check of cygwin's ALL_STATIC in pngconf.h
+ Added "-nommx" parameter to contrib/gregbook/rpng2-win and rpng2-x demos.
+version 1.0.10beta1 [March 14, 2001]
+ Revised makefile.dec, makefile.sgi, and makefile.sggcc; added makefile.hpgcc.
+ Reformatted libpng.3 to eliminate bad line breaks.
+ Added checks for _mmx_supported in the read_filter_row function of pnggccrd.c
+ Added prototype for png_mmx_support() near the top of pnggccrd.c
+ Moved some error checking from png_handle_IHDR to png_set_IHDR.
+ Added PNG_NO_READ_SUPPORTED and PNG_NO_WRITE_SUPPORTED macros.
+ Revised png_mmx_support() function in pnggccrd.c
+ Restored version 1.0.8 PNG_WRITE_EMPTY_PLTE_SUPPORTED behavior in pngwutil.c
+ Fixed memory leak in contrib/visupng/PngFile.c
+ Fixed bugs in png_combine_row() in pnggccrd.c and pngvcrd.c (C version)
+ Added warnings when retrieving or setting gamma=0.
+ Increased the first part of msg buffer from 16 to 18 in png_chunk_warning().
+version 1.0.10rc1 [March 23, 2001]
+ Changed all instances of memcpy, strcpy, and strlen to png_memcpy, png_strcpy,
+ and png_strlen.
+ Revised png_mmx_supported() function in pnggccrd.c to return proper value.
+ Fixed bug in progressive reading (pngpread.c) with small images (height < 8).
+version 1.0.10 [March 30, 2001]
+ Deleted extraneous space (introduced in 1.0.9) from line 42 of makefile.cygwin
+ Added beos project files (Chris Herborth)
+version 1.0.11beta1 [April 3, 2001]
+ Added type casts on several png_malloc() calls (Dimitri Papadapoulos).
+ Removed a no-longer needed AIX work-around from pngconf.h
+ Changed several "//" single-line comments to C-style in pnggccrd.c
+version 1.0.11beta2 [April 11, 2001]
+ Removed PNGAPI from several functions whose prototypes did not have PNGAPI.
+ Updated scripts/pngos2.def
+version 1.0.11beta3 [April 14, 2001]
+ Added checking the results of many instances of png_malloc() for NULL
+version 1.0.11beta4 [April 20, 2001]
+ Undid the changes from version 1.0.11beta3. Added a check for NULL return
+ from user's malloc_fn().
+ Removed some useless type casts of the NULL pointer.
+ Added makefile.netbsd
+version 1.0.11 [April 27, 2001]
+ Revised makefile.netbsd
+version 1.0.12beta1 [May 14, 2001]
+ Test for Windows platform in pngconf.h when including malloc.h (Emmanuel Blot)
+ Updated makefile.cygwin and handling of Cygwin's ALL_STATIC in pngconf.h
+ Added some never-to-be-executed code in pnggccrd.c to quiet compiler warnings.
+ Eliminated the png_error about apps using png_read|write_init(). Instead,
+ libpng will reallocate the png_struct and info_struct if they are too small.
+ This retains future binary compatibility for old applications written for
+ libpng-0.88 and earlier.
+version 1.2.0beta1 [May 6, 2001]
+ Bumped DLLNUM to 2.
+ Re-enabled PNG_MNG_FEATURES_SUPPORTED and enabled PNG_ASSEMBLER_CODE_SUPPORTED
+ by default.
+ Added runtime selection of MMX features.
+ Added png_set_strip_error_numbers function and related macros.
+version 1.2.0beta2 [May 7, 2001]
+ Finished merging 1.2.0beta1 with version 1.0.11
+ Added a check for attempts to read or write PLTE in grayscale PNG datastreams.
+version 1.2.0beta3 [May 17, 2001]
+ Enabled user memory function by default.
+ Modified png_create_struct so it passes user mem_ptr to user memory allocator.
+ Increased png_mng_features flag from png_byte to png_uint_32.
+ Bumped shared-library (so-number) and dll-number to 3.
+version 1.2.0beta4 [June 23, 2001]
+ Check for missing profile length field in iCCP chunk and free chunk_data
+ in case of truncated iCCP chunk.
+ Bumped shared-library number to 3 in makefile.sgi and makefile.sggcc
+ Bumped dll-number from 2 to 3 in makefile.cygwin
+ Revised contrib/gregbook/rpng*-x.c to avoid a memory leak and to exit cleanly
+ if user attempts to run it on an 8-bit display.
+ Updated contrib/gregbook
+ Use png_malloc instead of png_zalloc to allocate palette in pngset.c
+ Updated makefile.ibmc
+ Added some typecasts to eliminate gcc 3.0 warnings. Changed prototypes
+ of png_write_oFFS width and height from png_uint_32 to png_int_32.
+ Updated example.c
+ Revised prototypes for png_debug_malloc and png_debug_free in pngtest.c
+version 1.2.0beta5 [August 8, 2001]
+ Revised contrib/gregbook
+ Revised makefile.gcmmx
+ Revised pnggccrd.c to conditionally compile some thread-unsafe code only
+ when PNG_THREAD_UNSAFE_OK is defined.
+ Added tests to prevent pngwutil.c from writing a bKGD or tRNS chunk with
+ value exceeding 2^bit_depth-1
+ Revised makefile.sgi and makefile.sggcc
+ Replaced calls to fprintf(stderr,...) with png_warning() in pnggccrd.c
+ Removed restriction that do_invert_mono only operate on 1-bit opaque files
+version 1.2.0 [September 1, 2001]
+ Changed a png_warning() to png_debug() in pnggccrd.c
+ Fixed contrib/gregbook/rpng-x.c, rpng2-x.c to avoid crash with XFreeGC().
+version 1.2.1beta1 [October 19, 2001]
+ Revised makefile.std in contrib/pngminus
+ Include background_1 in png_struct regardless of gamma support.
+ Revised makefile.netbsd and makefile.macosx, added makefile.darwin.
+ Revised example.c to provide more details about using row_callback().
+version 1.2.1beta2 [October 25, 2001]
+ Added type cast to each NULL appearing in a function call, except for
+ WINCE functions.
+ Added makefile.so9.
+version 1.2.1beta3 [October 27, 2001]
+ Removed type casts from all NULLs.
+ Simplified png_create_struct_2().
+version 1.2.1beta4 [November 7, 2001]
+ Revised png_create_info_struct() and png_creat_struct_2().
+ Added error message if png_write_info() was omitted.
+ Type cast NULLs appearing in function calls when _NO_PROTO or
+ PNG_TYPECAST_NULL is defined.
+version 1.2.1rc1 [November 24, 2001]
+ Type cast NULLs appearing in function calls except when PNG_NO_TYPECAST_NULL
+ is defined.
+ Changed typecast of "size" argument to png_size_t in pngmem.c calls to
+ the user malloc_fn, to agree with the prototype in png.h
+ Added a pop/push operation to pnggccrd.c, to preserve Eflag (Maxim Sobolev)
+ Updated makefile.sgi to recognize LIBPATH and INCPATH.
+ Updated various makefiles so "make clean" does not remove previous major
+ version of the shared library.
+version 1.2.1rc2 [December 4, 2001]
+ Always allocate 256-entry internal palette, hist, and trans arrays, to
+ avoid out-of-bounds memory reference caused by invalid PNG datastreams.
+ Added a check for prefix_length > data_length in iCCP chunk handler.
+version 1.2.1 [December 7, 2001]
+ None.
+version 1.2.2beta1 [February 22, 2002]
+ Fixed a bug with reading the length of iCCP profiles (Larry Reeves).
+ Revised makefile.linux, makefile.gcmmx, and makefile.sgi to generate
+ libpng.a, libpng12.so (not libpng.so.3), and libpng12/png.h
+ Revised makefile.darwin to remove "-undefined suppress" option.
+ Added checks for gamma and chromaticity values over 21474.83, which exceed
+ the limit for PNG unsigned 32-bit integers when encoded.
+ Revised calls to png_create_read_struct() and png_create_write_struct()
+ for simpler debugging.
+ Revised png_zalloc() so zlib handles errors (uses PNG_FLAG_MALLOC_NULL_MEM_OK)
+version 1.2.2beta2 [February 23, 2002]
+ Check chunk_length and idat_size for invalid (over PNG_MAX_UINT) lengths.
+ Check for invalid image dimensions in png_get_IHDR.
+ Added missing "fi;" in the install target of the SGI makefiles.
+ Added install-static to all makefiles that make shared libraries.
+ Always do gamma compensation when image is partially transparent.
+version 1.2.2beta3 [March 7, 2002]
+ Compute background.gray and background_1.gray even when color_type is RGB
+ in case image gets reduced to gray later.
+ Modified shared-library makefiles to install pkgconfig/libpngNN.pc.
+ Export (with PNGAPI) png_zalloc, png_zfree, and png_handle_as_unknown
+ Removed unused png_write_destroy_info prototype from png.h
+ Eliminated incorrect use of width_mmx from pnggccrd.c in pixel_bytes == 8 case
+ Added install-shared target to all makefiles that make shared libraries.
+ Stopped a double free of palette, hist, and trans when not using free_me.
+ Added makefile.32sunu for Sun Ultra 32 and makefile.64sunu for Sun Ultra 64.
+version 1.2.2beta4 [March 8, 2002]
+ Compute background.gray and background_1.gray even when color_type is RGB
+ in case image gets reduced to gray later (Jason Summers).
+ Relocated a misplaced /bin/rm in the "install-shared" makefile targets
+ Added PNG_1_0_X macro which can be used to build a 1.0.x-compatible library.
+version 1.2.2beta5 [March 26, 2002]
+ Added missing PNGAPI to several function definitions.
+ Check for invalid bit_depth or color_type in png_get_IHDR(), and
+ check for missing PLTE or IHDR in png_push_read_chunk() (Matthias Clasen).
+ Revised iTXt support to accept NULL for lang and lang_key.
+ Compute gamma for color components of background even when color_type is gray.
+ Changed "()" to "{}" in scripts/libpng.pc.in.
+ Revised makefiles to put png.h and pngconf.h only in $prefix/include/libpngNN
+ Revised makefiles to make symlink to libpng.so.NN in addition to libpngNN.so
+version 1.2.2beta6 [March 31, 2002]
+version 1.0.13beta1 [March 31, 2002]
+ Prevent png_zalloc() from trying to memset memory that it failed to acquire.
+ Add typecasts of PNG_MAX_UINT in pngset_cHRM_fixed() (Matt Holgate).
+ Ensure that the right function (user or default) is used to free the
+ png_struct after an error in png_create_read_struct_2().
+version 1.2.2rc1 [April 7, 2002]
+version 1.0.13rc1 [April 7, 2002]
+ Save the ebx register in pnggccrd.c (Sami Farin)
+ Add "mem_ptr = png_ptr->mem_ptr" in png_destroy_write_struct() (Paul Gardner).
+ Updated makefiles to put headers in include/libpng and remove old include/*.h.
+version 1.2.2 [April 15, 2002]
+version 1.0.13 [April 15, 2002]
+ Revised description of png_set_filter() in libpng.3/libpng.txt.
+ Revised makefile.netbsd and added makefile.neNNbsd and makefile.freebsd
+version 1.0.13patch01 [April 17, 2002]
+version 1.2.2patch01 [April 17, 2002]
+ Changed ${PNGMAJ}.${PNGVER} bug to ${PNGVER} in makefile.sgi and makefile.sggcc
+ Fixed VER -> PNGVER typo in makefile.macosx and added install-static to install
+ Added install: target to makefile.32sunu and makefile.64sunu
+version 1.0.13patch03 [April 18, 2002]
+version 1.2.2patch03 [April 18, 2002]
+ Revised 15 makefiles to link libpng.a to libpngNN.a and the include libpng
+ subdirectory to libpngNN subdirectory without the full pathname.
+ Moved generation of libpng.pc from "install" to "all" in 15 makefiles.
+version 1.2.3rc1 [April 28, 2002]
+ Added install-man target to 15 makefiles (Dimitri Papadopolous-Orfanos).
+ Added $(DESTDIR) feature to 24 makefiles (Tim Mooney)
+ Fixed bug with $prefix, should be $(prefix) in makefile.hpux.
+ Updated cygwin-specific portion of pngconf.h and revised makefile.cygwin
+ Added a link from libpngNN.pc to libpng.pc in 15 makefiles.
+ Added links from include/libpngNN/*.h to include/*.h in 24 makefiles.
+ Revised makefile.darwin to make relative links without full pathname.
+ Added setjmp() at the end of png_create_*_struct_2() in case user forgets
+ to put one in their application.
+ Restored png_zalloc() and png_zfree() prototypes to version 1.2.1 and
+ removed them from module definition files.
+version 1.2.3rc2 [May 1, 2002]
+ Fixed bug in reporting number of channels in pngget.c and pngset.c,
+ that was introduced in version 1.2.2beta5.
+ Exported png_zalloc(), png_zfree(), png_default_read(), png_default_write(),
+ png_default_flush(), and png_push_fill_buffer() and included them in
+ module definition files.
+ Added "libpng.pc" dependency to the "install-shared" target in 15 makefiles.
+version 1.2.3rc3 [May 1, 2002]
+ Revised prototype for png_default_flush()
+ Remove old libpng.pc and libpngNN.pc before installing new ones.
+version 1.2.3rc4 [May 2, 2002]
+ Typos in *.def files (png_default_read|write -> png_default_read|write_data)
+ In makefiles, changed rm libpng.NN.pc to rm libpngNN.pc
+ Added libpng-config and libpngNN-config and modified makefiles to install them.
+ Changed $(MANPATH) to $(DESTDIR)$(MANPATH) in makefiles
+ Added "Win32 DLL VB" configuration to projects/msvc/libpng.dsp
+version 1.2.3rc5 [May 11, 2002]
+ Changed "error" and "message" in prototypes to "error_message" and
+ "warning_message" to avoid namespace conflict.
+ Revised 15 makefiles to build libpng-config from libpng-config-*.in
+ Once more restored png_zalloc and png_zfree to regular nonexported form.
+ Restored png_default_read|write_data, png_default_flush, png_read_fill_buffer
+ to nonexported form, but with PNGAPI, and removed them from module def files.
+version 1.2.3rc6 [May 14, 2002]
+ Removed "PNGAPI" from png_zalloc() and png_zfree() in png.c
+ Changed "Gz" to "Gd" in projects/msvc/libpng.dsp and zlib.dsp.
+ Removed leftover libpng-config "sed" script from four makefiles.
+ Revised libpng-config creating script in 16 makefiles.
+version 1.2.3 [May 22, 2002]
+ Revised libpng-config target in makefile.cygwin.
+ Removed description of png_set_mem_fn() from documentation.
+ Revised makefile.freebsd.
+ Minor cosmetic changes to 15 makefiles, e.g., $(DI) = $(DESTDIR)/$(INCDIR).
+ Revised projects/msvc/README.txt
+ Changed -lpng to -lpngNN in LDFLAGS in several makefiles.
+version 1.2.4beta1 [May 24, 2002]
+ Added libpng.pc and libpng-config to "all:" target in 16 makefiles.
+ Fixed bug in 16 makefiles: $(DESTDIR)/$(LIBPATH) to $(DESTDIR)$(LIBPATH)
+ Added missing "\" before closing double quote in makefile.gcmmx.
+ Plugged various memory leaks; added png_malloc_warn() and png_set_text_2()
+ functions.
+version 1.2.4beta2 [June 25, 2002]
+ Plugged memory leak of png_ptr->current_text (Matt Holgate).
+ Check for buffer overflow before reading CRC in pngpread.c (Warwick Allison)
+ Added -soname to the loader flags in makefile.dec, makefile.sgi, and
+ makefile.sggcc.
+ Added "test-installed" target to makefile.linux, makefile.gcmmx,
+ makefile.sgi, and makefile.sggcc.
+version 1.2.4beta3 [June 28, 2002]
+ Plugged memory leak of row_buf in pngtest.c when there is a png_error().
+ Detect buffer overflow in pngpread.c when IDAT is corrupted with extra data.
+ Added "test-installed" target to makefile.32sunu, makefile.64sunu,
+ makefile.beos, makefile.darwin, makefile.dec, makefile.macosx,
+ makefile.solaris, makefile.hpux, makefile.hpgcc, and makefile.so9.
+version 1.2.4rc1 [July 2, 2002]
+ Added "test-installed" target to makefile.cygwin and makefile.sco.
+ Revised pnggccrd.c to be able to back out version 1.0.x via PNG_1_0_X macro.
+version 1.2.4 [July 8, 2002]
+ Changed png_warning() to png_error() when width is too large to process.
+
+Send comments/corrections/commendations to
+png-implement@ccrc.wustl.edu or to randeg@alum.rpi.edu
+
+Glenn R-P
-Installing libpng version 1.0.3 - January 14, 1999
+Installing libpng version 1.2.4 - July 8, 2002
Before installing libpng, you must first install zlib. zlib
can usually be found wherever you got libpng. zlib can be
version of zlib that's installed.
You can rename the directories that you downloaded (they
-might be called "libpng-1.0.3" or "lpng103" and "zlib-1.1.3"
-or "zlib113") so that you have directories called "zlib" and "libpng".
+might be called "libpng-1.2.4" or "lpng109" and "zlib-1.1.4"
+or "zlib114") so that you have directories called "zlib" and "libpng".
Your directory structure should look like this:
README
*.h
*.c
+ contrib
+ gregbook
+ msvctest
+ pngminus
+ pngsuite
+ visupng
+ projects
+ beos
+ borland
+ msvc
+ netware.txt
+ wince.txt
scripts
makefile.*
+ libpng*.in
+ mangle
+ makefile.*
+ mangle.in
pngtest.png
etc.
zlib
contrib
etc.
-First enter the zlib directory and follow the instructions
-in zlib/README. Then come back here and choose the
-appropriate makefile.sys in the scripts directory.
+If the line endings in the files look funny, you may wish to get the other
+distribution of libpng. It is available in both tar.gz (UNIX style line
+endings) and zip (DOS style line endings) formats.
+
+If you are building libpng with MSVC, you can enter the libpng\msvc directory
+and follow the instructions in msvc\README.txt.
+
+You can build libpng for WindowsCE by entering the downloading and installing
+the libpng\wince directory as instructed in the projects\wince.txt file, and
+then following the instructions in the README* files. Similarly, you can
+build libpng for Netware as instructed in projects\netware.txt.
+
+Else enter the zlib directory and follow the instructions in zlib/README,
+then come back here and choose the appropriate makefile.sys in the scripts
+directory.
+
The files that are presently available in the scripts directory
include
- descrip.mms => VMS makefile for MMS or MMK
- makefile.std => Generic UNIX makefile
- makefile.knr => Archaic UNIX Makefile that converts files with ansi2knr
- makefile.dec => DEC Alpha UNIX makefile
- makefile.hux => HPUX (10.20 and 11.00) makefile
- makefile.sgi => Silicon Graphics IRIX makefile
- makefile.sun => Sun makefile
- makefile.s2x => Solaris 2.X makefile (gcc, creates libpng.so.2.1.0)
- makefile.lnx => Linux/ELF makefile (gcc, creates libpng.so.2.1.0)
- makefile.mip => MIPS makefile
- makefile.aco => Acorn makefile
- makefile.ama => Amiga makefile
- smakefile.ppc => AMIGA smakefile for SAS C V6.58/7.00 PPC compiler
- (Requires SCOPTIONS, copied from scripts/SCOPTIONS.ppc)
- makefile.atr => Atari makefile
- makefile.bor => Borland makefile
- build.bat => MS-DOS batch file for Borland compiler
- makefile.dj2 => DJGPP 2 makefile
- makefile.msc => Microsoft C makefile
- makefile.w32 => makefile for Microsoft Visual C++ 4.0 and later
- makefile.tc3 => Turbo C 3.0 makefile
- makefile.os2 => OS/2 Makefile (gcc and emx, requires pngos2.def)
- pngos2.def => OS/2 module definition file used by makefile.os2
- makefile.wat => Watcom 10a+ Makefile, 32-bit flat memory model
- makevms.com => VMS build script
- pngdll.mak => To make a png32bd.dll with Borland C++ 4.5
- pngdef.pas => Defines for a png32bd.dll with Borland C++ 4.5
+ makefile.std => Generic UNIX makefile (cc, creates static libpng.a)
+ makefile.linux => Linux/ELF makefile (gcc, creates libpng12.so.0.1.2.4)
+ makefile.gcmmx => Linux/ELF makefile (gcc, creates libpng12.so.0.1.2.4,
+ uses assembler code tuned for Intel MMX platform)
+ makefile.gcc => Generic makefile (gcc, creates static libpng.a)
+ makefile.knr => Archaic UNIX Makefile that converts files with
+ ansi2knr (Requires ansi2knr.c from
+ ftp://ftp.cs.wisc.edu/ghost)
+ makefile.aix => AIX makefile
+ makefile.cygwin => Cygwin/gcc makefile
+ makefile.darwin => Darwin makefile
+ makefile.dec => DEC Alpha UNIX makefile
+ makefile.hpgcc => FreeBSD makefile
+ makefile.hpgcc => HPUX makefile using gcc
+ makefile.hpux => HPUX (10.20 and 11.00) makefile
+ makefile.ibmc => IBM C/C++ version 3.x for Win32 and OS/2 (static)
+ makefile.intel => Intel C/C++ version 4.0 and later
+ libpng.icc => Project file for IBM VisualAge/C++ version 4.0 or later
+ makefile.macosx => MACOS X Makefile
+ makefile.netbsd => NetBSD/cc makefile, uses PNGGCCRD, makes libpng.so.
+ makefile.ne0bsd => NetBSD/cc makefile, uses PNGGCCRD, makes libpng0.so
+ makefile.openbsd => OpenBSD makefile
+ makefile.sgi => Silicon Graphics IRIX makefile (cc, creates static lib)
+ makefile.sggcc => Silicon Graphics (gcc, creates libpng12.so.0.1.2.4)
+ makefile.sunos => Sun makefile
+ makefile.solaris => Solaris 2.X makefile (gcc, creates libpng12.so.0.1.2.4)
+ makefile.so9 => Solaris 9 makefile (gcc, creates libpng12.so.0.1.2.4)
+ makefile.32sunu => Sun Ultra 32-bit makefile
+ makefile.64sunu => Sun Ultra 64-bit makefile
+ makefile.sco => For SCO OSr5 ELF and Unixware 7 with Native cc
+ makefile.mips => MIPS makefile
+ makefile.acorn => Acorn makefile
+ makefile.amiga => Amiga makefile
+ smakefile.ppc => AMIGA smakefile for SAS C V6.58/7.00 PPC compiler
+ (Requires SCOPTIONS, copied from scripts/SCOPTIONS.ppc)
+ makefile.atari => Atari makefile
+ makefile.beos => BEOS makefile for X86
+ makefile.bor => Borland makefile (uses bcc)
+ makefile.bc32 => 32-bit Borland C++ (all modules compiled in C mode)
+ makefile.bd32 => To make a png32bd.dll with Borland C++ 4.5
+ makefile.tc3 => Turbo C 3.0 makefile
+ makefile.dj2 => DJGPP 2 makefile
+ makefile.msc => Microsoft C makefile
+ makefile.vcawin32 => makefile for Microsoft Visual C++ 5.0 and later (uses
+ assembler code tuned for Intel MMX platform)
+ makefile.vcwin32 => makefile for Microsoft Visual C++ 4.0 and later (does
+ not use assembler code)
+ makefile.os2 => OS/2 Makefile (gcc and emx, requires pngos2.def)
+ pngos2.def => OS/2 module definition file used by makefile.os2
+ makefile.watcom => Watcom 10a+ Makefile, 32-bit flat memory model
+ makevms.com => VMS build script
+ descrip.mms => VMS makefile for MMS or MMK
+ pngdef.pas => Defines for a png32bd.dll with Borland C++ 4.5
+ SCOPTIONS.ppc => Used with smakefile.ppc
Copy the file (or files) that you need from the
scripts directory into this directory, for example
- MSDOS example: copy scripts\makefile.msd makefile
+ MSDOS example: copy scripts\makefile.msc makefile
UNIX example: cp scripts/makefile.std makefile
Read the makefile to see if you need to change any source or
Then just run "make test" which will create the libpng library in
this directory and run a quick test that reads the "pngtest.png"
file and writes a "pngout.png" file that should be identical to it.
+Look for "9782 zero samples" in the output of the test. For more
+confidence, you can run another test by typing "pngtest pngnow.png"
+and looking for "289 zero samples" in the output. Also, you can
+run "pngtest -m *.png" in the "contrib/pngsuite" directory and compare
+your output with the result shown in contrib/pngsuite/README.
Most of the makefiles will allow you to run "make install" to
put the library in its final resting place (if you want to
do that, run "make install" in the zlib directory first if necessary).
+Some also allow you to run "make test-installed" after you have
+run "make install". This will build and run executables called "pngtesti"
+and "mangle/pngtestm".
+
+The files that are presently available in the mangle directory include the
+following. The makefiles are automatically run by the corresponding makefiles
+in the scripts directory when you run "make", "make install", or
+"make test-installed".
+
+ mangle.in => Function-decoration macros added to png.h by the
+ makefiles.
+ makefile.linux => Linux/ELF makefile
+ (gcc, creates libpng12m.so.0.1.2.4)
+ makefile.gcmmx => Linux/ELF makefile (gcc, creates
+ libpng12.so.0m.1.2.4, uses assembler code
+ tuned for Intel MMX platform)
+ makefile.sgi => Silicon Graphics (cc, creates libpng12m.so)
+ makefile.sggcc => Silicon Graphics (gcc, creates libpng12m.so)
Further information can be found in the README and libpng.txt
-files, in the individual makefiles, and in png.h, and the manual
-pages libpng.3 and png.5.
+files, in the individual makefiles, in png.h, in the README files in
+subdirectories of the LIB directory, and the manual pages libpng.3 and png.5.
-README for libpng 1.0.3 - January 14, 1999 (shared library 2.1)
+README for libpng 1.2.4 - July 8, 2002 (shared library 12.0)
See the note about version numbers near the top of png.h
See INSTALL for instructions on how to install libpng.
-This is the first official release of libpng. Don't let the fact that
-it's the first release fool you. The libpng library has been in
-extensive use and testing for about two and a half years. However, it's
-finally gotten to the stage where there haven't been significant
+Libpng comes in two distribution formats. Get libpng-*.tar.gz if you
+want UNIX-style line endings in the text files, or lpng*.zip if you want
+DOS-style line endings.
+
+Version 0.89 was the first official release of libpng. Don't let the
+fact that it's the first release fool you. The libpng library has been in
+extensive use and testing since mid-1995. By late 1997 it had
+finally gotten to the stage where there hadn't been significant
changes to the API in some time, and people have a bad feeling about
-libraries with versions < 1.0.
+libraries with versions < 1.0. Version 1.0.0 was released in
+March 1998.
****
Note that some of the changes to the png_info structure render this
It is important to note that the APIs do not make current programs
that access the info struct directly incompatible with the new
library. However, it is strongly suggested that new programs use
-the new APIs (as shown in example.c), and older programs be converted
-to the new format, to facilitate upgrades in the future.
+the new APIs (as shown in example.c and pngtest.c), and older programs
+be converted to the new format, to facilitate upgrades in the future.
****
Additions since 0.90 include the ability to compile libpng as a
critical or an ancillary chunk.
The changes made to the library, and bugs fixed are based on discussions
-on the PNG implementation mailing list <png-implement@dworking.wustl.edu>
-and not on material submitted to Guy.
+on the PNG implementation mailing list <png-implement@ccrc.wustl.edu>
+and not on material submitted privately to Guy, Andreas, or Glenn. They will
+forward any good suggestions to the list.
For a detailed description on using libpng, read libpng.txt. For
examples of libpng in a program, see example.c and pngtest.c. For usage
This release was created and will be supported by myself (of course
based in a large way on Guy's and Andreas' earlier work), and the PNG group.
-randeg@alumni.rpi.edu
-png-implement@dworkin.wustl.edu
+randeg@alum.rpi.edu
+png-implement@ccrc.wustl.edu
You can't reach Guy, the original libpng author, at the addresses
given in previous versions of this document. He and Andreas will read mail
Please do not send general questions about PNG. Send them to
the address in the specification (png-group@w3.org). At the same
time, please do not send libpng questions to that address, send them to me
-or to png-implement@dworkin.wustl.edu. I'll
+or to png-implement@ccrc.wustl.edu. I'll
get them in the end anyway. If you have a question about something
in the PNG specification that is related to using libpng, send it
to me. Send me any questions that start with "I was using libpng,
Files in this distribution:
+ ANNOUNCE => Announcement of this version, with recent changes
CHANGES => Description of changes between libpng versions
+ KNOWNBUG => List of known bugs and deficiencies
+ LICENSE => License to use and redistribute libpng
README => This file
TODO => Things not implemented in the current library
- ansi2knr.1 => Manual page for ansi2knr
- ansi2knr.c => Converts files to K&R style function declarations
- build.bat => MS-DOS batch file for Borland compiler
- descrip.mms => VMS project file
+ Y2KINFO => Statement of Y2K compliance
example.c => Example code for using libpng functions
- libpng.3 => manual page for libpng
+ libpng.3 => manual page for libpng (includes libpng.txt)
libpng.txt => Description of libpng and its functions
libpngpf.3 => manual page for libpng's private functions
png.5 => manual page for the PNG format
png.c => Basic interface functions common to library
png.h => Library function and interface declarations
pngconf.h => System specific library configuration
+ pngasmrd.h => Header file for assembler-coded functions
pngerror.c => Error/warning message I/O functions
pngget.c => Functions for retrieving info from struct
pngmem.c => Memory handling functions
+ pngbar.png => PNG logo, 88x31
+ pngnow.png => PNG logo, 98x31
pngpread.c => Progressive reading functions
pngread.c => Read data/helper high-level functions
pngrio.c => Lowest-level data read I/O functions
pngwrite.c => High-level write functions
pngwtran.c => Write data transformations
pngwutil.c => Write utility functions
+ contrib => Contributions
+ gregbook => source code for PNG reading and writing, from
+ Greg Roelofs' "PNG: The Definitive Guide",
+ O'Reilly, 1999
+ msvctest => Builds and runs pngtest using a MSVC workspace
+ pngminus => Simple pnm2png and png2pnm programs
+ pngsuite => Test images
+ visupng => Contains a MSVC workspace for VisualPng
+ projects => Contains project files and workspaces for building DLL
+ beos => Contains a Beos workspace for building libpng
+ borland => Contains a Borland workspace for building libpng
+ and zlib
+ msvc => Contains a Microsoft Visual C++ (MSVC) workspace
+ for building libpng and zlib
+ netware.txt => Contains instructions for downloading a set of
+ project files for building libpng and zlib on
+ Netware.
+ wince.txt => Contains instructions for downloading a Microsoft
+ Visual C++ (Windows CD Toolkit) workspace for
+ building libpng and zlib on WindowsCE
scripts => Directory containing scripts for building libpng:
- descrip.mms => VMS makefile for MMS or MMK
- makefile.std => Generic UNIX makefile
- makefile.knr => Archaic UNIX Makefile that converts files with ansi2knr
- makefile.dec => DEC Alpha UNIX makefile
- makefile.hux => HPUX (10.20 and 11.00) makefile
- makefile.sgi => Silicon Graphics IRIX makefile
- makefile.sun => Sun makefile
- makefile.s2x => Solaris 2.X makefile (gcc, creates libpng.so.2.1.0)
- makefile.lnx => Linux/ELF makefile (gcc, creates libpng.so.2.1.0)
- makefile.mip => MIPS makefile
- makefile.aco => Acorn makefile
- makefile.ama => Amiga makefile
- smakefile.ppc => AMIGA smakefile for SAS C V6.58/7.00 PPC compiler
- (Requires SCOPTIONS, copied from scripts/SCOPTIONS.ppc)
- makefile.atr => Atari makefile
- makefile.bor => Borland makefile
- build.bat => MS-DOS batch file for Borland compiler
- makefile.dj2 => DJGPP 2 makefile
- makefile.msc => Microsoft C makefile
- makefile.w32 => makefile for Microsoft Visual C++ 4.0 and later
- makefile.tc3 => Turbo C 3.0 makefile
- makefile.os2 => OS/2 Makefile (gcc and emx, requires pngos2.def)
- makefile.wat => Watcom 10a+ Makefile, 32-bit flat memory model
- pngos2.def => OS/2 module definition file used by makefile.os2
- makevms.com => VMS build script
- pngdll.mak => To make a png32bd.dll with Borland C++ 4.5
- pngdef.pas => Defines for a png32bd.dll with Borland C++ 4.5
+ descrip.mms => VMS makefile for MMS or MMK
+ makefile.std => Generic UNIX makefile (cc, creates static libpng.a)
+ makefile.linux => Linux/ELF makefile
+ (gcc, creates libpng12.so.0.1.2.4)
+ makefile.gcmmx => Linux/ELF makefile (gcc, creates
+ libpng12.so.0.1.2.4, uses assembler code
+ tuned for Intel MMX platform)
+ makefile.gcc => Generic makefile (gcc, creates static libpng.a)
+ makefile.knr => Archaic UNIX Makefile that converts files with
+ ansi2knr (Requires ansi2knr.c from
+ ftp://ftp.cs.wisc.edu/ghost)
+ makefile.aix => AIX makefile
+ makefile.cygwin => Cygwin/gcc makefile
+ makefile.darwin => Darwin makefile
+ makefile.dec => DEC Alpha UNIX makefile
+ makefile.freebsd => FreeBSD makefile
+ makefile.hpgcc => HPUX makefile using gcc
+ makefile.hpux => HPUX (10.20 and 11.00) makefile
+ makefile.ibmc => IBM C/C++ version 3.x for Win32 and OS/2 (static)
+ makefile.intel => Intel C/C++ version 4.0 and later
+ libpng.icc => Project file, IBM VisualAge/C++ 4.0 or later
+ makefile.macosx => MACOS X Makefile
+ makefile.netbsd => NetBSD/cc makefile, PNGGCCRD, makes libpng.so.
+ makefile.ne0bsd => NetBSD/cc makefile, PNGGCCRD, makes libpng0.so
+ makefile.openbsd => OpenBSD makefile
+ makefile.sgi => Silicon Graphics IRIX (cc, creates static lib)
+ makefile.sggcc => Silicon Graphics (gcc, creates libpng12.so.0.1.2.4)
+ makefile.sunos => Sun makefile
+ makefile.solaris => Solaris 2.X makefile
+ (gcc, creates libpng12.so.0.1.2.4)
+ makefile.so9 => Solaris 9 makefile
+ (gcc, creates libpng12.so.0.1.2.4)
+ makefile.32sunu => Sun Ultra 32-bit makefile
+ makefile.64sunu => Sun Ultra 64-bit makefile
+ makefile.sco => For SCO OSr5 ELF and Unixware 7 with Native cc
+ makefile.mips => MIPS makefile
+ makefile.acorn => Acorn makefile
+ makefile.amiga => Amiga makefile
+ smakefile.ppc => AMIGA smakefile for SAS C V6.58/7.00 PPC
+ compiler (Requires SCOPTIONS, copied from
+ scripts/SCOPTIONS.ppc)
+ makefile.atari => Atari makefile
+ makefile.beos => BEOS makefile for X86
+ makefile.bor => Borland makefile (uses bcc)
+ makefile.bc32 => 32-bit Borland C++ (all modules compiled in C mode)
+ makefile.bd32 => To make a png32bd.dll with Borland C++ 4.5
+ makefile.tc3 => Turbo C 3.0 makefile
+ makefile.dj2 => DJGPP 2 makefile
+ makefile.msc => Microsoft C makefile
+ makefile.vcawin32 => makefile for Microsoft Visual C++ 5.0 and
+ later (uses assembler code tuned for Intel MMX
+ platform)
+ makefile.vcwin32 => makefile for Microsoft Visual C++ 4.0 and
+ later (does not use assembler code)
+ makefile.os2 => OS/2 Makefile (gcc and emx, requires pngos2.def)
+ pngos2.def => OS/2 module definition file used by makefile.os2
+ makefile.watcom => Watcom 10a+ Makefile, 32-bit flat memory model
+ makevms.com => VMS build script
+ pngdef.pas => Defines for a png32bd.dll with Borland C++ 4.5
+ SCOPTIONS.ppc => Used with smakefile.ppc
+ mangle => Directory containing scripts to build libpng12m.so:
+ mangle.in => Function-decoration macros added to png.h by the
+ makefiles.
+ makefile.linux => Linux/ELF makefile
+ (gcc, creates libpng12m.so.0.1.2.4)
+ makefile.gcmmx => Linux/ELF makefile (gcc, creates
+ libpng12.so.0m.1.2.4, uses assembler code
+ tuned for Intel MMX platform)
+ makefile.sgi => Silicon Graphics (cc, creates libpng12m.so)
+ makefile.sggcc => Silicon Graphics (gcc, creates libpng12m.so)
Good luck, and happy coding.
-Glenn Randers-Pehrson
- Internet: randeg@alumni.rpi.edu
- Web: http://www.rpi.edu/~randeg/index.html
+ Internet: randeg@alum.rpi.edu
-Andreas Eric Dilger
Internet: adilger@enel.ucalgary.ca
-foreach i (ANNOUNCE CHANGES INSTALL README TODO Y2KINFO example.c libpng.3 libpng.txt libpngpf.3 png.5 png.c png.h pngconf.h pngerror.c pngget.c pngmem.c pngpread.c pngread.c pngrio.c pngrtran.c pngrutil.c pngset.c pngtest.c pngtrans.c pngwio.c pngwrite.c pngwtran.c pngwutil.c)
+TODO - list of things to do for libpng:
-cvs up -rLIBPNG_1_0_3 $i
-cp $i $i.old
-cvs up -A $i
-mv $i.old $i
-cvs add $i
-
-end
+Final bug fixes.
+Improve API by hiding the png_struct and png_info structs.
+Finish work on the no-floating-point version (including gamma compensation)
+Better C++ wrapper/full C++ implementation?
+Fix problem with C++ and EXTERN "C".
+cHRM transformation.
+Improve setjmp/longjmp usage or remove it in favor of returning error codes.
+Add "grayscale->palette" transformation and "palette->grayscale" detection.
+Improved dithering.
+Multi-lingual error and warning message support.
+Complete sRGB transformation (presently it simply uses gamma=0.45455).
+Man pages for function calls.
+Better documentation.
+Better filter selection
+ (counting huffman bits/precompression? filter inertia? filter costs?).
+Histogram creation.
+Text conversion between different code pages (Latin-1 -> Mac and DOS).
+Should we always malloc 2^bit_depth PLTE/tRNS/hIST entries for safety?
+Build gamma tables using fixed point (and do away with floating point entirely).
+Use greater precision when changing to linear gamma for compositing against
+ background and doing rgb-to-gray transformation.
+Investigate pre-incremented loop counters and other loop constructions.
Y2K compliance in libpng:
=========================
-
- January 13, 1999
-
+
+ July 8, 2002
+
Since the PNG Development group is an ad-hoc body, we can't make
an official declaration.
-
- This is your unofficial assurance that libpng from version 0.81 and
- upward are Y2K compliant. It is my belief that earlier versions were
- also Y2K compliant.
-
+
+ This is your unofficial assurance that libpng from version 0.71 and
+ upward through 1.2.4 are Y2K compliant. It is my belief that earlier
+ versions were also Y2K compliant.
+
Libpng only has three year fields. One is a 2-byte unsigned integer
that will hold years up to 65535. The other two hold the date in text
format, and will hold years up to 9999.
-
+
The integer is
"png_uint_16 year" in png_time_struct.
-
+
The strings are
"png_charp time_buffer" in png_struct and
"near_time_buffer", which is a local character string in png.c.
-
+
There are seven time-related functions:
- png_convert_to_rfc_1123() in png.c
+ png_convert_to_rfc_1123() in png.c
(formerly png_convert_to_rfc_1152() in error)
png_convert_from_struct_tm() in pngwrite.c, called in pngwrite.c
png_convert_from_time_t() in pngwrite.c
png_handle_tIME() in pngrutil.c, called in pngread.c
png_set_tIME() in pngset.c
png_write_tIME() in pngwutil.c, called in pngwrite.c
-
- All appear to handle dates properly in a Y2K environment. The
+
+ All appear to handle dates properly in a Y2K environment. The
png_convert_from_time_t() function calls gmtime() to convert from system
clock time, which returns (year - 1900), which we properly convert to
the full 4-digit year. There is a possibility that applications using
libpng are not passing 4-digit years into the png_convert_to_rfc_1123()
- function, or incorrectly passing only a 2-digit year instead of
- "year - 1900" into the png_convert_from_struct_tm() function, but this
- is not under our control. The libpng documentation has always stated
- that it works with 4-digit years, and the APIs have been documented as
- such.
-
+ function, or that they are incorrectly passing only a 2-digit year
+ instead of "year - 1900" into the png_convert_from_struct_tm() function,
+ but this is not under our control. The libpng documentation has always
+ stated that it works with 4-digit years, and the APIs have been
+ documented as such.
+
The tIME chunk itself is also Y2K compliant. It uses a 2-byte unsigned
integer to hold the year, and can hold years as large as 65535.
-
-
+
+ zlib, upon which libpng depends, is also Y2K compliant. It contains
+ no date-related code.
+
+
Glenn Randers-Pehrson
libpng maintainer
PNG Development Group
+#if 0 /* in case someone actually tries to compile this */
+
/* example.c - an example of using libpng */
/* This is an example of how to use libpng to read and write PNG files.
* The file libpng.txt is much more verbose then this. If you have not
* read it, do so first. This was designed to be a starting point of an
- * implementation. This is not officially part of libpng, and therefore
- * does not require a copyright notice.
+ * implementation. This is not officially part of libpng, is hereby placed
+ * in the public domain, and therefore does not require a copyright notice.
*
* This file does not currently compile, because it is missing certain
* parts, like allocating memory to hold an image. You will have to
* supply these parts to get it to compile. For an example of a minimal
- * working PNG reader/writer, see pngtest.c, included in this distribution.
+ * working PNG reader/writer, see pngtest.c, included in this distribution;
+ * see also the programs in the contrib directory.
*/
#include "png.h"
+ /* The png_jmpbuf() macro, used in error handling, became available in
+ * libpng version 1.0.6. If you want to be able to run your code with older
+ * versions of libpng, you must define the macro yourself (but only if it
+ * is not already defined by libpng!).
+ */
+
+#ifndef png_jmpbuf
+# define png_jmpbuf(png_ptr) ((png_ptr)->jmpbuf)
+#endif
+
/* Check to see if a file is a PNG file using png_sig_cmp(). png_sig_cmp()
* returns zero if the image is a PNG and nonzero if it isn't a PNG.
*
char buf[PNG_BYTES_TO_CHECK];
/* Open the prospective PNG file. */
- if ((*fp = fopen(file_name, "rb")) != NULL);
+ if ((*fp = fopen(file_name, "rb")) == NULL)
return 0;
/* Read in some of the signature bytes */
FILE *fp;
if ((fp = fopen(file_name, "rb")) == NULL)
- return;
+ return (ERROR);
#else no_open_file /* prototype 2 */
void read_png(FILE *fp, unsigned int sig_read) /* file is already open */
{
if (png_ptr == NULL)
{
fclose(fp);
- return;
+ return (ERROR);
}
/* Allocate/initialize the memory for image information. REQUIRED. */
if (info_ptr == NULL)
{
fclose(fp);
- png_destroy_read_struct(&png_ptr, (png_infopp)NULL, (png_infopp)NULL);
- return;
+ png_destroy_read_struct(&png_ptr, png_infopp_NULL, png_infopp_NULL);
+ return (ERROR);
}
/* Set error handling if you are using the setjmp/longjmp method (this is
* the normal method of doing things with libpng). REQUIRED unless you
* set up your own error handlers in the png_create_read_struct() earlier.
*/
- if (setjmp(png_ptr->jmpbuf))
+
+ if (setjmp(png_jmpbuf(png_ptr)))
{
/* Free all of the memory associated with the png_ptr and info_ptr */
- png_destroy_read_struct(&png_ptr, &info_ptr, (png_infopp)NULL);
+ png_destroy_read_struct(&png_ptr, &info_ptr, png_infopp_NULL);
fclose(fp);
/* If we get here, we had a problem reading the file */
- return;
+ return (ERROR);
}
/* One of the following I/O initialization methods is REQUIRED */
/* If we have already read some of the signature */
png_set_sig_bytes(png_ptr, sig_read);
+#ifdef hilevel
+ /*
+ * If you have enough memory to read in the entire image at once,
+ * and you need to specify only transforms that can be controlled
+ * with one of the PNG_TRANSFORM_* bits (this presently excludes
+ * dithering, filling, setting background, and doing gamma
+ * adjustment), then you can read the entire image (including
+ * pixels) into the info structure with this call:
+ */
+ png_read_png(png_ptr, info_ptr, png_transforms, png_voidp_NULL);
+#else
+ /* OK, you're doing it the hard way, with the lower-level functions */
+
/* The call to png_read_info() gives us all of the information from the
* PNG file before the first IDAT (image data chunk). REQUIRED
*/
png_read_info(png_ptr, info_ptr);
png_get_IHDR(png_ptr, info_ptr, &width, &height, &bit_depth, &color_type,
- &interlace_type, NULL, NULL);
+ &interlace_type, int_p_NULL, int_p_NULL);
-/**** Set up the data transformations you want. Note that these are all
- **** optional. Only call them if you want/need them. Many of the
- **** transformations only work on specific types of images, and many
- **** are mutually exclusive.
- ****/
+/* Set up the data transformations you want. Note that these are all
+ * optional. Only call them if you want/need them. Many of the
+ * transformations only work on specific types of images, and many
+ * are mutually exclusive.
+ */
/* tell libpng to strip 16 bit/color files down to 8 bits/color */
png_set_strip_16(png_ptr);
- /* Strip alpha bytes from the input data without combining with th
+ /* Strip alpha bytes from the input data without combining with the
* background (not recommended).
*/
png_set_strip_alpha(png_ptr);
/* Expand paletted colors into true RGB triplets */
if (color_type == PNG_COLOR_TYPE_PALETTE)
- png_set_expand(png_ptr);
+ png_set_palette_rgb(png_ptr);
/* Expand grayscale images to the full 8 bits from 1, 2, or 4 bits/pixel */
if (color_type == PNG_COLOR_TYPE_GRAY && bit_depth < 8)
- png_set_expand(png_ptr);
+ png_set_gray_1_2_4_to_8(png_ptr);
/* Expand paletted or RGB images with transparency to full alpha channels
* so the data will be available as RGBA quartets.
*/
if (png_get_valid(png_ptr, info_ptr, PNG_INFO_tRNS))
- png_set_expand(png_ptr);
+ png_set_tRNS_to_alpha(png_ptr);
/* Set the background color to draw transparent and alpha images over.
* It is possible to set the red, green, and blue components directly
/* Some suggestions as to how to get a screen gamma value */
- /* Note that screen gamma is (display_gamma/viewing_gamma) */
+ /* Note that screen gamma is the display_exponent, which includes
+ * the CRT_exponent and any correction for viewing conditions */
if (/* We have a user-defined screen gamma value */)
{
screen_gamma = user-defined screen_gamma;
screen_gamma = 1.7 or 1.0; /* A good guess for Mac systems */
}
- /* Tell libpng to handle the gamma conversion for you. The second call
+ /* Tell libpng to handle the gamma conversion for you. The final call
* is a good guess for PC generated images, but it should be configurable
* by the user at run time by the user. It is strongly suggested that
* your application support gamma correction.
int intent;
if (png_get_sRGB(png_ptr, info_ptr, &intent))
- png_set_sRGB(png_ptr, intent, 0);
+ png_set_gamma(png_ptr, screen_gamma, 0.45455);
else
{
double image_gamma;
*/
if (color_type & PNG_COLOR_MASK_COLOR)
{
- png_uint_32 num_palette;
+ int num_palette;
png_colorp palette;
/* This reduces the image to the application supplied palette */
png_color std_color_cube[MAX_SCREEN_COLORS];
png_set_dither(png_ptr, std_color_cube, MAX_SCREEN_COLORS,
- MAX_SCREEN_COLORS, NULL, 0);
+ MAX_SCREEN_COLORS, png_uint_16p_NULL, 0);
}
/* This reduces the image to the palette supplied in the file */
else if (png_get_PLTE(png_ptr, info_ptr, &palette, &num_palette))
{
- png_color16p histogram;
+ png_uint_16p histogram;
png_get_hIST(png_ptr, info_ptr, &histogram);
}
}
- /* invert monocrome files to have 0 as white and 1 as black */
+ /* invert monochrome files to have 0 as white and 1 as black */
png_set_invert_mono(png_ptr);
/* If you want to shift the pixel values from the range [0,255] or
*/
if (png_get_valid(png_ptr, info_ptr, PNG_INFO_sBIT))
{
- png_color8p sig_bit;
+ png_color_8p sig_bit;
png_get_sBIT(png_ptr, info_ptr, &sig_bit);
png_set_shift(png_ptr, sig_bit);
}
/* flip the RGB pixels to BGR (or RGBA to BGRA) */
- png_set_bgr(png_ptr);
+ if (color_type & PNG_COLOR_MASK_COLOR)
+ png_set_bgr(png_ptr);
/* swap the RGBA or GA data to ARGB or AG (or BGRA to ABGR) */
png_set_swap_alpha(png_ptr);
for (row = 0; row < height; row++)
{
- row_pointers[row] = malloc(png_get_rowbytes(png_ptr, info_ptr));
+ row_pointers[row] = png_malloc(png_ptr, png_get_rowbytes(png_ptr,
+ info_ptr));
}
/* Now it's time to read the image. One of these methods is REQUIRED */
#ifdef single /* Read the image a single row at a time */
for (y = 0; y < height; y++)
{
- png_read_rows(png_ptr, &row_pointers[y], NULL, 1);
+ png_read_rows(png_ptr, &row_pointers[y], png_bytepp_NULL, 1);
}
#else no_single /* Read the image several rows at a time */
for (y = 0; y < height; y += number_of_rows)
{
#ifdef sparkle /* Read the image using the "sparkle" effect. */
- png_read_rows(png_ptr, &row_pointers[y], NULL, number_of_rows);
-
- png_read_rows(png_ptr, NULL, row_pointers[y], number_of_rows);
+ png_read_rows(png_ptr, &row_pointers[y], png_bytepp_NULL,
+ number_of_rows);
#else no_sparkle /* Read the image using the "rectangle" effect */
- png_read_rows(png_ptr, NULL, &row_pointers[y], number_of_rows);
+ png_read_rows(png_ptr, png_bytepp_NULL, &row_pointers[y],
+ number_of_rows);
#endif no_sparkle /* use only one of these two methods */
}
/* read rest of file, and get additional chunks in info_ptr - REQUIRED */
png_read_end(png_ptr, info_ptr);
+#endif hilevel
+
+ /* At this point you have read the entire image */
/* clean up after the read, and free any memory allocated - REQUIRED */
- png_destroy_read_struct(&png_ptr, &info_ptr, (png_infopp)NULL);
+ png_destroy_read_struct(&png_ptr, &info_ptr, png_infopp_NULL);
/* close the file */
fclose(fp);
/* that's it */
- return;
+ return (OK);
}
/* progressively read a file */
if (*png_ptr == NULL)
{
*info_ptr = NULL;
- return ERROR;
+ return (ERROR);
}
*info_ptr = png_create_info_struct(png_ptr);
if (*info_ptr == NULL)
{
- png_destroy_read_struct(png_ptr, info_ptr, (png_infopp)NULL);
- return ERROR;
+ png_destroy_read_struct(png_ptr, info_ptr, png_infopp_NULL);
+ return (ERROR);
}
- if (setjmp((*png_ptr)->jmpbuf))
+ if (setjmp(png_jmpbuf((*png_ptr))))
{
- png_destroy_read_struct(png_ptr, info_ptr, (png_infopp)NULL);
- return ERROR;
+ png_destroy_read_struct(png_ptr, info_ptr, png_infopp_NULL);
+ return (ERROR);
}
/* This one's new. You will need to provide all three
png_set_progressive_read_fn(*png_ptr, (void *)stream_data,
info_callback, row_callback, end_callback);
- return OK;
+ return (OK);
}
int
process_data(png_structp *png_ptr, png_infop *info_ptr,
png_bytep buffer, png_uint_32 length)
{
- if (setjmp((*png_ptr)->jmpbuf))
+ if (setjmp(png_jmpbuf((*png_ptr))))
{
/* Free the png_ptr and info_ptr memory on error */
- png_destroy_read_struct(png_ptr, info_ptr, (png_infopp)NULL);
- return ERROR;
+ png_destroy_read_struct(png_ptr, info_ptr, png_infopp_NULL);
+ return (ERROR);
}
/* This one's new also. Simply give it chunks of data as
* callback, if you aren't already displaying them there.
*/
png_process_data(*png_ptr, *info_ptr, buffer, length);
- return OK;
+ return (OK);
}
info_callback(png_structp png_ptr, png_infop info)
row_callback(png_structp png_ptr, png_bytep new_row,
png_uint_32 row_num, int pass)
{
-/* this function is called for every row in the image. If the
- * image is interlacing, and you turned on the interlace handler,
+/*
+ * This function is called for every row in the image. If the
+ * image is interlaced, and you turned on the interlace handler,
* this function will be called for every row in every pass.
- * Some of these rows will not be changed from the previous pass.
- * When the row is not changed, the new_row variable will be NULL.
+ *
+ * In this function you will receive a pointer to new row data from
+ * libpng called new_row that is to replace a corresponding row (of
+ * the same data format) in a buffer allocated by your application.
+ *
+ * The new row data pointer new_row may be NULL, indicating there is
+ * no new data to be replaced (in cases of interlace loading).
+ *
+ * If new_row is not NULL then you need to call
+ * png_progressive_combine_row() to replace the corresponding row as
+ * shown below:
+ */
+ /* Check if row_num is in bounds. */
+ if((row_num >= 0) && (row_num < height))
+ {
+ /* Get pointer to corresponding row in our
+ * PNG read buffer.
+ */
+ png_bytep old_row = ((png_bytep *)our_data)[row_num];
+
+ /* If both rows are allocated then copy the new row
+ * data to the corresponding row data.
+ */
+ if((old_row != NULL) && (new_row != NULL))
+ png_progressive_combine_row(png_ptr, old_row, new_row);
+ }
+/*
* The rows and passes are called in order, so you don't really
* need the row_num and pass, but I'm supplying them because it
* may make your life easier.
*
* For the non-NULL rows of interlaced images, you must call
- * png_progressive_combine_row() passing in the row and the
- * old row. You can call this function for NULL rows (it will
- * just return) and for non-interlaced images (it just does the
- * memcpy for you) if it will make the code easier. Thus, you
- * can just do this for all cases:
+ * png_progressive_combine_row() passing in the new row and the
+ * old row, as demonstrated above. You can call this function for
+ * NULL rows (it will just return) and for non-interlaced images
+ * (it just does the png_memcpy for you) if it will make the code
+ * easier. Thus, you can just do this for all cases:
*/
png_progressive_combine_row(png_ptr, old_row, new_row);
* that the first pass (pass == 0 really) will completely cover
* the old row, so the rows do not have to be initialized. After
* the first pass (and only for interlaced images), you will have
- * to pass the current row, and the function will combine the
- * old row and the new row.
+ * to pass the current row as new_row, and the function will combine
+ * the old row and the new row.
*/
}
FILE *fp;
png_structp png_ptr;
png_infop info_ptr;
+ png_colorp palette;
/* open the file */
fp = fopen(file_name, "wb");
if (fp == NULL)
- return;
+ return (ERROR);
/* Create and initialize the png_struct with the desired error handler
* functions. If you want to use the default stderr and longjump method,
if (png_ptr == NULL)
{
fclose(fp);
- return;
+ return (ERROR);
}
/* Allocate/initialize the image information data. REQUIRED */
if (info_ptr == NULL)
{
fclose(fp);
- png_destroy_write_struct(&png_ptr, (png_infopp)NULL);
- return;
+ png_destroy_write_struct(&png_ptr, png_infopp_NULL);
+ return (ERROR);
}
/* Set error handling. REQUIRED if you aren't supplying your own
- * error hadnling functions in the png_create_write_struct() call.
+ * error handling functions in the png_create_write_struct() call.
*/
- if (setjmp(png_ptr->jmpbuf))
+ if (setjmp(png_jmpbuf(png_ptr)))
{
/* If we get here, we had a problem reading the file */
fclose(fp);
- png_destroy_write_struct(&png_ptr, (png_infopp)NULL);
- return;
+ png_destroy_write_struct(&png_ptr, &info_ptr);
+ return (ERROR);
}
/* One of the following I/O initialization functions is REQUIRED */
/* where user_io_ptr is a structure you want available to the callbacks */
#endif no_streams /* only use one initialization method */
+#ifdef hilevel
+ /* This is the easy way. Use it if you already have all the
+ * image info living info in the structure. You could "|" many
+ * PNG_TRANSFORM flags into the png_transforms integer here.
+ */
+ png_write_png(png_ptr, info_ptr, png_transforms, png_voidp_NULL);
+#else
+ /* This is the hard way */
+
/* Set the image information here. Width and height are up to 2^31,
* bit_depth is one of 1, 2, 4, 8, or 16, but valid values also depend on
* the color_type selected. color_type is one of PNG_COLOR_TYPE_GRAY,
PNG_INTERLACE_????, PNG_COMPRESSION_TYPE_BASE, PNG_FILTER_TYPE_BASE);
/* set the palette if there is one. REQUIRED for indexed-color images */
- palette = (png_colorp)png_malloc(png_ptr, 256 * sizeof (png_color));
+ palette = (png_colorp)png_malloc(png_ptr, PNG_MAX_PALETTE_LENGTH
+ * sizeof (png_color));
/* ... set palette colors ... */
- png_set_PLTE(png_ptr, info_ptr, palette, 256);
+ png_set_PLTE(png_ptr, info_ptr, palette, PNG_MAX_PALETTE_LENGTH);
+ /* You must not free palette here, because png_set_PLTE only makes a link to
+ the palette that you malloced. Wait until you are about to destroy
+ the png structure. */
/* optional significant bit chunk */
/* if we are dealing with a grayscale image then */
text_ptr[2].key = "Description";
text_ptr[2].text = "<long text>";
text_ptr[2].compression = PNG_TEXT_COMPRESSION_zTXt;
+#ifdef PNG_iTXt_SUPPORTED
+ text_ptr[0].lang = NULL;
+ text_ptr[1].lang = NULL;
+ text_ptr[2].lang = NULL;
+#endif
png_set_text(png_ptr, info_ptr, text_ptr, 3);
/* other optional chunks like cHRM, bKGD, tRNS, tIME, oFFs, pHYs, */
- /* note that if sRGB is present the cHRM chunk must be ignored
+ /* note that if sRGB is present the gAMA and cHRM chunks must be ignored
* on read and must be written in accordance with the sRGB profile */
/* Write the file header information. REQUIRED */
png_write_info(png_ptr, info_ptr);
+ /* If you want, you can write the info in two steps, in case you need to
+ * write your private chunk ahead of PLTE:
+ *
+ * png_write_info_before_PLTE(write_ptr, write_info_ptr);
+ * write_my_chunk();
+ * png_write_info(png_ptr, info_ptr);
+ *
+ * However, given the level of known- and unknown-chunk support in 1.1.0
+ * and up, this should no longer be necessary.
+ */
+
/* Once we write out the header, the compression type on the text
* chunks gets changed to PNG_TEXT_COMPRESSION_NONE_WR or
* PNG_TEXT_COMPRESSION_zTXt_WR, so it doesn't get written out again
* all optional. Only call them if you want them.
*/
- /* invert monocrome pixels */
+ /* invert monochrome pixels */
png_set_invert_mono(png_ptr);
/* Shift the pixels up to a legal bit depth and fill in
* use the first method if you aren't handling interlacing yourself.
*/
png_uint_32 k, height, width;
- png_byte image[height][width];
+ png_byte image[height][width*bytes_per_pixel];
png_bytep row_pointers[height];
for (k = 0; k < height; k++)
- row_pointers[k] = image + k*width;
+ row_pointers[k] = image + k*width*bytes_per_pixel;
/* One of the following output methods is REQUIRED */
#ifdef entire /* write out the entire image data in one call */
#endif no_entire /* use only one output method */
/* You can write optional chunks like tEXt, zTXt, and tIME at the end
- * as well.
+ * as well. Shouldn't be necessary in 1.1.0 and up as all the public
+ * chunks are supported and you can use png_set_unknown_chunks() to
+ * register unknown chunks into the info structure to be written out.
*/
/* It is REQUIRED to call this to finish writing the rest of the file */
png_write_end(png_ptr, info_ptr);
-
- /* if you malloced the palette, free it here */
- free(info_ptr->palette);
-
- /* if you allocated any text comments, free them here */
+#endif hilevel
+
+ /* If you png_malloced a palette, free it here (don't free info_ptr->palette,
+ as recommended in versions 1.0.5m and earlier of this example; if
+ libpng mallocs info_ptr->palette, libpng will free it). If you
+ allocated it with malloc() instead of png_malloc(), use free() instead
+ of png_free(). */
+ png_free(png_ptr, palette);
+ palette=NULL;
+
+ /* Similarly, if you png_malloced any data that you passed in with
+ png_set_something(), such as a hist or trans array, free it here,
+ when you can be sure that libpng is through with it. */
+ png_free(png_ptr, trans);
+ trans=NULL;
/* clean up after the write, and free any memory allocated */
- png_destroy_write_struct(&png_ptr, (png_infopp)NULL);
+ png_destroy_write_struct(&png_ptr, &info_ptr);
/* close the file */
fclose(fp);
/* that's it */
- return;
+ return (OK);
}
+#endif /* if 0 */
-.TH LIBPNG 3 "January 14, 1999"
+.TH LIBPNG 3 "July 8, 2002"
.SH NAME
-libpng \- Portable Network Graphics (PNG) Reference Library 1.0.3 - January 14, 1999
+libpng \- Portable Network Graphics (PNG) Reference Library 1.2.4
.SH SYNOPSIS
+\fI\fB
-#include <png.h>
+\fB#include <png.h>\fP
+
+\fI\fB
+
+\fBpng_uint_32 png_access_version_number \fI(void\fP\fB);\fP
+
+\fI\fB
+
+\fBint png_check_sig (png_bytep \fP\fIsig\fP\fB, int \fInum\fP\fB);\fP
+
+\fI\fB
+
+\fBvoid png_chunk_error (png_structp \fP\fIpng_ptr\fP\fB, png_const_charp \fIerror\fP\fB);\fP
+
+\fI\fB
+
+\fBvoid png_chunk_warning (png_structp \fP\fIpng_ptr\fP\fB, png_const_charp \fImessage\fP\fB);\fP
+
+\fI\fB
+
+\fBvoid png_convert_from_struct_tm (png_timep \fP\fIptime\fP\fB, struct tm FAR * \fIttime\fP\fB);\fP
+
+\fI\fB
+
+\fBvoid png_convert_from_time_t (png_timep \fP\fIptime\fP\fB, time_t \fIttime\fP\fB);\fP
+
+\fI\fB
+
+\fBpng_charp png_convert_to_rfc1123 (png_structp \fP\fIpng_ptr\fP\fB, png_timep \fIptime\fP\fB);\fP
+
+\fI\fB
+
+\fBpng_infop png_create_info_struct (png_structp \fIpng_ptr\fP\fB);\fP
+
+\fI\fB
+
+\fBpng_structp png_create_read_struct (png_const_charp \fP\fIuser_png_ver\fP\fB, png_voidp \fP\fIerror_ptr\fP\fB, png_error_ptr \fP\fIerror_fn\fP\fB, png_error_ptr \fIwarn_fn\fP\fB);\fP
+
+\fI\fB
+
+\fBpng_structp png_create_read_struct_2(png_const_charp \fP\fIuser_png_ver\fP\fB, png_voidp \fP\fIerror_ptr\fP\fB, png_error_ptr \fP\fIerror_fn\fP\fB, png_error_ptr \fP\fIwarn_fn\fP\fB, png_voidp \fP\fImem_ptr\fP\fB, png_malloc_ptr \fP\fImalloc_fn\fP\fB, png_free_ptr \fIfree_fn\fP\fB);\fP
+
+\fI\fB
+
+\fBpng_structp png_create_write_struct (png_const_charp \fP\fIuser_png_ver\fP\fB, png_voidp \fP\fIerror_ptr\fP\fB, png_error_ptr \fP\fIerror_fn\fP\fB, png_error_ptr \fIwarn_fn\fP\fB);\fP
+
+\fI\fB
+
+\fBpng_structp png_create_write_struct_2(png_const_charp \fP\fIuser_png_ver\fP\fB, png_voidp \fP\fIerror_ptr\fP\fB, png_error_ptr \fP\fIerror_fn\fP\fB, png_error_ptr \fP\fIwarn_fn\fP\fB, png_voidp \fP\fImem_ptr\fP\fB, png_malloc_ptr \fP\fImalloc_fn\fP\fB, png_free_ptr \fIfree_fn\fP\fB);\fP
+
+\fI\fB
+
+\fBint png_debug(int \fP\fIlevel\fP\fB, png_const_charp \fImessage\fP\fB);\fP
+
+\fI\fB
+
+\fBint png_debug1(int \fP\fIlevel\fP\fB, png_const_charp \fP\fImessage\fP\fB, \fIp1\fP\fB);\fP
+
+\fI\fB
+
+\fBint png_debug2(int \fP\fIlevel\fP\fB, png_const_charp \fP\fImessage\fP\fB, \fP\fIp1\fP\fB, \fIp2\fP\fB);\fP
+
+\fI\fB
+
+\fBvoid png_destroy_info_struct (png_structp \fP\fIpng_ptr\fP\fB, png_infopp \fIinfo_ptr_ptr\fP\fB);\fP
+
+\fI\fB
+
+\fBvoid png_destroy_read_struct (png_structpp \fP\fIpng_ptr_ptr\fP\fB, png_infopp \fP\fIinfo_ptr_ptr\fP\fB, png_infopp \fIend_info_ptr_ptr\fP\fB);\fP
+
+\fI\fB
+
+\fBvoid png_destroy_write_struct (png_structpp \fP\fIpng_ptr_ptr\fP\fB, png_infopp \fIinfo_ptr_ptr\fP\fB);\fP
+
+\fI\fB
+
+\fBvoid png_error (png_structp \fP\fIpng_ptr\fP\fB, png_const_charp \fIerror\fP\fB);\fP
+
+\fI\fB
+
+\fBvoid png_free (png_structp \fP\fIpng_ptr\fP\fB, png_voidp \fIptr\fP\fB);\fP
+
+\fI\fB
+
+\fBvoid png_free_chunk_list (png_structp \fIpng_ptr\fP\fB);\fP
+
+\fI\fB
+
+\fBvoid png_free_default(png_structp \fP\fIpng_ptr\fP\fB, png_voidp \fIptr\fP\fB);\fP
+
+\fI\fB
+
+\fBvoid png_free_data (png_structp \fP\fIpng_ptr\fP\fB, png_infop \fP\fIinfo_ptr\fP\fB, int \fInum\fP\fB);\fP
+
+\fI\fB
+
+\fBpng_uint_32 png_get_asm_flags (png_structp \fIpng_ptr\fP\fB);\fP
+
+\fI\fB
+
+\fBpng_byte png_get_bit_depth (png_structp \fP\fIpng_ptr\fP\fB, png_infop \fIinfo_ptr\fP\fB);\fP
+
+\fI\fB
+
+\fBpng_uint_32 png_get_bKGD (png_structp \fP\fIpng_ptr\fP\fB, png_infop \fP\fIinfo_ptr\fP\fB, png_color_16p \fI*background\fP\fB);\fP
+
+\fI\fB
+
+\fBpng_byte png_get_channels (png_structp \fP\fIpng_ptr\fP\fB, png_infop \fIinfo_ptr\fP\fB);\fP
+
+\fI\fB
+
+\fBpng_uint_32 png_get_cHRM (png_structp \fP\fIpng_ptr\fP\fB, png_infop \fP\fIinfo_ptr\fP\fB, double \fP\fI*white_x\fP\fB, double \fP\fI*white_y\fP\fB, double \fP\fI*red_x\fP\fB, double \fP\fI*red_y\fP\fB, double \fP\fI*green_x\fP\fB, double \fP\fI*green_y\fP\fB, double \fP\fI*blue_x\fP\fB, double \fI*blue_y\fP\fB);\fP
+
+\fI\fB
+
+\fBpng_uint_32 png_get_cHRM_fixed (png_structp \fP\fIpng_ptr\fP\fB, png_infop \fP\fIinfo_ptr\fP\fB, png_uint_32 \fP\fI*white_x\fP\fB, png_uint_32 \fP\fI*white_y\fP\fB, png_uint_32 \fP\fI*red_x\fP\fB, png_uint_32 \fP\fI*red_y\fP\fB, png_uint_32 \fP\fI*green_x\fP\fB, png_uint_32 \fP\fI*green_y\fP\fB, png_uint_32 \fP\fI*blue_x\fP\fB, png_uint_32 \fI*blue_y\fP\fB);\fP
+
+\fI\fB
+
+\fBpng_byte png_get_color_type (png_structp \fP\fIpng_ptr\fP\fB, png_infop \fIinfo_ptr\fP\fB);\fP
+
+\fI\fB
+
+\fBpng_byte png_get_compression_type (png_structp \fP\fIpng_ptr\fP\fB, png_infop \fIinfo_ptr\fP\fB);\fP
+
+\fI\fB
+
+\fBpng_byte png_get_copyright (png_structp \fIpng_ptr\fP\fB);\fP
+
+\fI\fB
+
+\fBpng_voidp png_get_error_ptr (png_structp \fIpng_ptr\fP\fB);\fP
+
+\fI\fB
+
+\fBpng_byte png_get_filter_type (png_structp \fP\fIpng_ptr\fP\fB, png_infop \fIinfo_ptr\fP\fB);\fP
+
+\fI\fB
+
+\fBpng_uint_32 png_get_gAMA (png_structp \fP\fIpng_ptr\fP\fB, png_infop \fP\fIinfo_ptr\fP\fB, double \fI*file_gamma\fP\fB);\fP
+
+\fI\fB
+
+\fBpng_uint_32 png_get_gAMA_fixed (png_structp \fP\fIpng_ptr\fP\fB, png_infop \fP\fIinfo_ptr\fP\fB, png_uint_32 \fI*int_file_gamma\fP\fB);\fP
+
+\fI\fB
+
+\fBpng_byte png_get_header_ver (png_structp \fIpng_ptr\fP\fB);\fP
+
+\fI\fB
+
+\fBpng_byte png_get_header_version (png_structp \fIpng_ptr\fP\fB);\fP
+
+\fI\fB
+
+\fBpng_uint_32 png_get_hIST (png_structp \fP\fIpng_ptr\fP\fB, png_infop \fP\fIinfo_ptr\fP\fB, png_uint_16p \fI*hist\fP\fB);\fP
+
+\fI\fB
+
+\fBpng_uint_32 png_get_iCCP (png_structp \fP\fIpng_ptr\fP\fB, png_infop \fP\fIinfo_ptr\fP\fB, png_charpp \fP\fIname\fP\fB, int \fP\fI*compression_type\fP\fB, png_charpp \fP\fIprofile\fP\fB, png_uint_32 \fI*proflen\fP\fB);\fP
+
+\fI\fB
+
+\fBpng_uint_32 png_get_IHDR (png_structp \fP\fIpng_ptr\fP\fB, png_infop \fP\fIinfo_ptr\fP\fB, png_uint_32 \fP\fI*width\fP\fB, png_uint_32 \fP\fI*height\fP\fB, int \fP\fI*bit_depth\fP\fB, int \fP\fI*color_type\fP\fB, int \fP\fI*interlace_type\fP\fB, int \fP\fI*compression_type\fP\fB, int \fI*filter_type\fP\fB);\fP
+
+\fI\fB
+
+\fBpng_uint_32 png_get_image_height (png_structp \fP\fIpng_ptr\fP\fB, png_infop \fIinfo_ptr\fP\fB);\fP
+
+\fI\fB
+
+\fBpng_uint_32 png_get_image_width (png_structp \fP\fIpng_ptr\fP\fB, png_infop \fIinfo_ptr\fP\fB);\fP
+
+\fI\fB
+
+\fBpng_byte png_get_interlace_type (png_structp \fP\fIpng_ptr\fP\fB, png_infop \fIinfo_ptr\fP\fB);\fP
+
+\fI\fB
+
+\fBpng_voidp png_get_io_ptr (png_structp \fIpng_ptr\fP\fB);\fP
+
+\fI\fB
+
+\fBpng_byte png_get_libpng_ver (png_structp \fIpng_ptr\fP\fB);\fP
+
+\fI\fB
+
+\fBpng_voidp png_get_mem_ptr(png_structp \fIpng_ptr\fP\fB);\fP
+
+\fI\fB
+
+\fBpng_byte png_get_mmx_bitdepth_threshold (png_structp \fIpng_ptr\fP\fB);\fP
+
+\fI\fB
+
+\fBpng_uint_32 png_get_mmx_flagmask (int \fP\fIflag_select\fP\fB, int \fI*compilerID\fP\fB);\fP
+
+\fI\fB
+
+\fBpng_uint_32 png_get_mmx_rowbytes_threshold (png_structp \fIpng_ptr\fP\fB);\fP
+
+\fI\fB
+
+\fBpng_uint_32 png_get_oFFs (png_structp \fP\fIpng_ptr\fP\fB, png_infop \fP\fIinfo_ptr\fP\fB, png_uint_32 \fP\fI*offset_x\fP\fB, png_uint_32 \fP\fI*offset_y\fP\fB, int \fI*unit_type\fP\fB);\fP
+
+\fI\fB
+
+\fBpng_uint_32 png_get_pCAL (png_structp \fP\fIpng_ptr\fP\fB, png_infop \fP\fIinfo_ptr\fP\fB, png_charp \fP\fI*purpose\fP\fB, png_int_32 \fP\fI*X0\fP\fB, png_int_32 \fP\fI*X1\fP\fB, int \fP\fI*type\fP\fB, int \fP\fI*nparams\fP\fB, png_charp \fP\fI*units\fP\fB, png_charpp \fI*params\fP\fB);\fP
+
+\fI\fB
+
+\fBpng_uint_32 png_get_pHYs (png_structp \fP\fIpng_ptr\fP\fB, png_infop \fP\fIinfo_ptr\fP\fB, png_uint_32 \fP\fI*res_x\fP\fB, png_uint_32 \fP\fI*res_y\fP\fB, int \fI*unit_type\fP\fB);\fP
+
+\fI\fB
+
+\fBfloat png_get_pixel_aspect_ratio (png_structp \fP\fIpng_ptr\fP\fB, png_infop \fIinfo_ptr\fP\fB);\fP
+
+\fI\fB
+
+\fBpng_uint_32 png_get_pixels_per_meter (png_structp \fP\fIpng_ptr\fP\fB, png_infop \fIinfo_ptr\fP\fB);\fP
+
+\fI\fB
+
+\fBpng_voidp png_get_progressive_ptr (png_structp \fIpng_ptr\fP\fB);\fP
+
+\fI\fB
+
+\fBpng_uint_32 png_get_PLTE (png_structp \fP\fIpng_ptr\fP\fB, png_infop \fP\fIinfo_ptr\fP\fB, png_colorp \fP\fI*palette\fP\fB, int \fI*num_palette\fP\fB);\fP
+
+\fI\fB
+
+\fBpng_byte png_get_rgb_to_gray_status (png_structp \fIpng_ptr)
+
+\fBpng_uint_32 png_get_rowbytes (png_structp \fP\fIpng_ptr\fP\fB, png_infop \fIinfo_ptr\fP\fB);\fP
+
+\fI\fB
+
+\fBpng_bytepp png_get_rows (png_structp \fP\fIpng_ptr\fP\fB, png_infop \fIinfo_ptr\fP\fB);\fP
+
+\fI\fB
+
+\fBpng_uint_32 png_get_sBIT (png_structp \fP\fIpng_ptr\fP\fB, png_infop \fP\fIinfo_ptr\fP\fB, png_color_8p \fI*sig_bit\fP\fB);\fP
+
+\fI\fB
+
+\fBpng_bytep png_get_signature (png_structp \fP\fIpng_ptr\fP\fB, png_infop \fIinfo_ptr\fP\fB);\fP
+
+\fI\fB
+
+\fBpng_uint_32 png_get_sPLT (png_structp \fP\fIpng_ptr\fP\fB, png_infop \fP\fIinfo_ptr\fP\fB, png_spalette_p \fI*splt_ptr\fP\fB);\fP
+
+\fI\fB
+
+\fBpng_uint_32 png_get_sRGB (png_structp \fP\fIpng_ptr\fP\fB, png_infop \fP\fIinfo_ptr\fP\fB, int \fI*intent\fP\fB);\fP
+
+\fI\fB
+
+\fBpng_uint_32 png_get_text (png_structp \fP\fIpng_ptr\fP\fB, png_infop \fP\fIinfo_ptr\fP\fB, png_textp \fP\fI*text_ptr\fP\fB, int \fI*num_text\fP\fB);\fP
+
+\fI\fB
+
+\fBpng_uint_32 png_get_tIME (png_structp \fP\fIpng_ptr\fP\fB, png_infop \fP\fIinfo_ptr\fP\fB, png_timep \fI*mod_time\fP\fB);\fP
+
+\fI\fB
+
+\fBpng_uint_32 png_get_tRNS (png_structp \fP\fIpng_ptr\fP\fB, png_infop \fP\fIinfo_ptr\fP\fB, png_bytep \fP\fI*trans\fP\fB, int \fP\fI*num_trans\fP\fB, png_color_16p \fI*trans_values\fP\fB);\fP
+
+\fI\fB
+
+\fBpng_uint_32 png_get_unknown_chunks (png_structp \fP\fIpng_ptr\fP\fB, png_infop \fP\fIinfo_ptr\fP\fB, png_unknown_chunkpp \fIunknowns\fP\fB);\fP
+
+\fI\fB
+
+\fBpng_voidp png_get_user_chunk_ptr (png_structp \fIpng_ptr\fP\fB);\fP
+
+\fI\fB
+
+\fBpng_voidp png_get_user_transform_ptr (png_structp \fIpng_ptr\fP\fB);\fP
+
+\fI\fB
+
+\fBpng_uint_32 png_get_valid (png_structp \fP\fIpng_ptr\fP\fB, png_infop \fP\fIinfo_ptr\fP\fB, png_uint_32 \fIflag\fP\fB);\fP
+
+\fI\fB
+
+\fBpng_int_32 png_get_x_offset_microns (png_structp \fP\fIpng_ptr\fP\fB, png_infop \fIinfo_ptr\fP\fB);\fP
+
+\fI\fB
+
+\fBpng_int_32 png_get_x_offset_pixels (png_structp \fP\fIpng_ptr\fP\fB, png_infop \fIinfo_ptr\fP\fB);\fP
+
+\fI\fB
+
+\fBpng_uint_32 png_get_x_pixels_per_meter (png_structp \fP\fIpng_ptr\fP\fB, png_infop \fIinfo_ptr\fP\fB);\fP
+
+\fI\fB
+
+\fBpng_int_32 png_get_y_offset_microns (png_structp \fP\fIpng_ptr\fP\fB, png_infop \fIinfo_ptr\fP\fB);\fP
+
+\fI\fB
+
+\fBpng_int_32 png_get_y_offset_pixels (png_structp \fP\fIpng_ptr\fP\fB, png_infop \fIinfo_ptr\fP\fB);\fP
+
+\fI\fB
+
+\fBpng_uint_32 png_get_y_pixels_per_meter (png_structp \fP\fIpng_ptr\fP\fB, png_infop \fIinfo_ptr\fP\fB);\fP
+
+\fI\fB
+
+\fBpng_uint_32 png_get_compression_buffer_size (png_structp \fIpng_ptr\fP\fB);\fP
+
+\fI\fB
+
+\fBint png_handle_as_unknown (png_structp \fP\fIpng_ptr\fP\fB, png_bytep \fIchunk_name\fP\fB);\fP
+
+\fI\fB
+
+\fBvoid png_init_io (png_structp \fP\fIpng_ptr\fP\fB, FILE \fI*fp\fP\fB);\fP
+
+\fI\fB
+
+\fBDEPRECATED: void png_info_init (png_infop \fIinfo_ptr\fP\fB);\fP
+
+\fI\fB
+
+\fBDEPRECATED: void png_info_init_2 (png_infopp \fP\fIptr_ptr\fP\fB, png_size_t \fIpng_info_struct_size\fP\fB);\fP
+
+\fI\fB
+
+\fBpng_voidp png_malloc (png_structp \fP\fIpng_ptr\fP\fB, png_uint_32 \fIsize\fP\fB);\fP
+
+\fI\fB
+
+\fBpng_voidp png_malloc_default(png_structp \fP\fIpng_ptr\fP\fB, png_uint_32 \fIsize\fP\fB);\fP
+
+\fI\fB
+
+\fBpng_voidp png_malloc_warn (png_structp \fP\fIpng_ptr\fP\fB, png_uint_32 \fIsize\fP\fB);\fP
+
+\fI\fB
+
+\fBvoidp png_memcpy (png_voidp \fP\fIs1\fP\fB, png_voidp \fP\fIs2\fP\fB, png_size_t \fIsize\fP\fB);\fP
+
+\fI\fB
+
+\fBpng_voidp png_memcpy_check (png_structp \fP\fIpng_ptr\fP\fB, png_voidp \fP\fIs1\fP\fB, png_voidp \fP\fIs2\fP\fB, png_uint_32 \fIsize\fP\fB);\fP
+
+\fI\fB
+
+\fBvoidp png_memset (png_voidp \fP\fIs1\fP\fB, int \fP\fIvalue\fP\fB, png_size_t \fIsize\fP\fB);\fP
+
+\fI\fB
+
+\fBpng_voidp png_memset_check (png_structp \fP\fIpng_ptr\fP\fB, png_voidp \fP\fIs1\fP\fB, int \fP\fIvalue\fP\fB, png_uint_32 \fIsize\fP\fB);\fP
+
+\fI\fB
+
+\fBint png_mmx_support \fI(void\fP\fB);\fP
+
+\fI\fB
+
+\fBDEPRECATED: void png_permit_empty_plte (png_structp \fP\fIpng_ptr\fP\fB, int \fIempty_plte_permitted\fP\fB);\fP
+
+\fI\fB
+
+\fBvoid png_process_data (png_structp \fP\fIpng_ptr\fP\fB, png_infop \fP\fIinfo_ptr\fP\fB, png_bytep \fP\fIbuffer\fP\fB, png_size_t \fIbuffer_size\fP\fB);\fP
+
+\fI\fB
+
+\fBvoid png_progressive_combine_row (png_structp \fP\fIpng_ptr\fP\fB, png_bytep \fP\fIold_row\fP\fB, png_bytep \fInew_row\fP\fB);\fP
+
+\fI\fB
+
+\fBvoid png_read_destroy (png_structp \fP\fIpng_ptr\fP\fB, png_infop \fP\fIinfo_ptr\fP\fB, png_infop \fIend_info_ptr\fP\fB);\fP
+
+\fI\fB
+
+\fBvoid png_read_end (png_structp \fP\fIpng_ptr\fP\fB, png_infop \fIinfo_ptr\fP\fB);\fP
+
+\fI\fB
+
+\fBvoid png_read_image (png_structp \fP\fIpng_ptr\fP\fB, png_bytepp \fIimage\fP\fB);\fP
+
+\fI\fB
+
+\fBDEPRECATED: void png_read_init (png_structp \fIpng_ptr\fP\fB);\fP
+
+\fI\fB
+
+\fBDEPRECATED: void png_read_init_2 (png_structpp \fP\fIptr_ptr\fP\fB, png_const_charp \fP\fIuser_png_ver\fP\fB, png_size_t \fP\fIpng_struct_size\fP\fB, png_size_t \fIpng_info_size\fP\fB);\fP
+
+\fI\fB
+
+\fBvoid png_read_info (png_structp \fP\fIpng_ptr\fP\fB, png_infop \fIinfo_ptr\fP\fB);\fP
+
+\fI\fB
+
+\fBvoid png_read_png (png_structp \fP\fIpng_ptr\fP\fB, png_infop \fP\fIinfo_ptr\fP\fB, int \fP\fItransforms\fP\fB, png_voidp \fIparams\fP\fB);\fP
+
+\fI\fB
+
+\fBvoid png_read_row (png_structp \fP\fIpng_ptr\fP\fB, png_bytep \fP\fIrow\fP\fB, png_bytep \fIdisplay_row\fP\fB);\fP
+
+\fI\fB
+
+\fBvoid png_read_rows (png_structp \fP\fIpng_ptr\fP\fB, png_bytepp \fP\fIrow\fP\fB, png_bytepp \fP\fIdisplay_row\fP\fB, png_uint_32 \fInum_rows\fP\fB);\fP
+
+\fI\fB
+
+\fBvoid png_read_update_info (png_structp \fP\fIpng_ptr\fP\fB, png_infop \fIinfo_ptr\fP\fB);\fP
+
+\fI\fB
+
+\fBpng_set_asm_flags (png_structp \fP\fIpng_ptr\fP\fB, png_uint_32 \fIasm_flags\fP\fB);\fP
+
+\fI\fB
+
+\fBvoid png_set_background (png_structp \fP\fIpng_ptr\fP\fB, png_color_16p \fP\fIbackground_color\fP\fB, int \fP\fIbackground_gamma_code\fP\fB, int \fP\fIneed_expand\fP\fB, double \fIbackground_gamma\fP\fB);\fP
+
+\fI\fB
+
+\fBvoid png_set_bgr (png_structp \fIpng_ptr\fP\fB);\fP
+
+\fI\fB
-int png_check_sig (png_bytep sig, int num);
+\fBvoid png_set_bKGD (png_structp \fP\fIpng_ptr\fP\fB, png_infop \fP\fIinfo_ptr\fP\fB, png_color_16p \fIbackground\fP\fB);\fP
-void png_chunk_error (png_structp png_ptr, png_const_charp
-error);
+\fI\fB
-void png_chunk_warning (png_structp png_ptr, png_const_charp
-message);
+\fBvoid png_set_cHRM (png_structp \fP\fIpng_ptr\fP\fB, png_infop \fP\fIinfo_ptr\fP\fB, double \fP\fIwhite_x\fP\fB, double \fP\fIwhite_y\fP\fB, double \fP\fIred_x\fP\fB, double \fP\fIred_y\fP\fB, double \fP\fIgreen_x\fP\fB, double \fP\fIgreen_y\fP\fB, double \fP\fIblue_x\fP\fB, double \fIblue_y\fP\fB);\fP
-void png_convert_from_struct_tm (png_timep ptime, struct tm FAR
-* ttime);
+\fI\fB
-void png_convert_from_time_t (png_timep ptime, time_t ttime);
+\fBvoid png_set_cHRM_fixed (png_structp \fP\fIpng_ptr\fP\fB, png_infop \fP\fIinfo_ptr\fP\fB, png_uint_32 \fP\fIwhite_x\fP\fB, png_uint_32 \fP\fIwhite_y\fP\fB, png_uint_32 \fP\fIred_x\fP\fB, png_uint_32 \fP\fIred_y\fP\fB, png_uint_32 \fP\fIgreen_x\fP\fB, png_uint_32 \fP\fIgreen_y\fP\fB, png_uint_32 \fP\fIblue_x\fP\fB, png_uint_32 \fIblue_y\fP\fB);\fP
-png_charp png_convert_to_rfc1123 (png_structp png_ptr,
-png_timep ptime);
+\fI\fB
-png_infop png_create_info_struct (png_structp png_ptr);
+\fBvoid png_set_compression_level (png_structp \fP\fIpng_ptr\fP\fB, int \fIlevel\fP\fB);\fP
-png_structp png_create_read_struct (png_const_charp
-user_png_ver, voidp error_ptr, png_error_ptr error_fn,
-png_error_ptr warn_fn);
+\fI\fB
-png_structp png_create_read_struct_2(png_const_charp user_png_ver,
-png_voidp error_ptr, png_error_ptr error_fn, png_error_ptr
-warn_fn, png_voidp mem_ptr, png_malloc_ptr malloc_fn,
-png_free_ptr free_fn)
+\fBvoid png_set_compression_mem_level (png_structp \fP\fIpng_ptr\fP\fB, int \fImem_level\fP\fB);\fP
-png_structp png_create_write_struct (png_const_charp
-user_png_ver, voidp error_ptr, png_error_ptr error_fn,
-png_error_ptr warn_fn);
+\fI\fB
-png_structp png_create_write_struct_2(png_const_charp
-user_png_ver, png_voidp error_ptr, png_error_ptr error_fn,
-png_error_ptr warn_fn, png_voidp mem_ptr,
-png_malloc_ptr malloc_fn, png_free_ptr free_fn)
+\fBvoid png_set_compression_method (png_structp \fP\fIpng_ptr\fP\fB, int \fImethod\fP\fB);\fP
-int png_debug(int level, png_const_charp message)
+\fI\fB
-int png_debug1(int level, png_const_charp message, p1)
+\fBvoid png_set_compression_strategy (png_structp \fP\fIpng_ptr\fP\fB, int \fIstrategy\fP\fB);\fP
-int png_debug2(int level, png_const_charp message, p1, p2)
+\fI\fB
-void png_destroy_info_struct (png_structp png_ptr, png_infopp
-info_ptr_ptr);
+\fBvoid png_set_compression_window_bits (png_structp \fP\fIpng_ptr\fP\fB, int \fIwindow_bits\fP\fB);\fP
-void png_destroy_read_struct (png_structpp png_ptr_ptr,
-png_infopp info_ptr_ptr, png_infopp end_info_ptr_ptr);
+\fI\fB
-void png_destroy_write_struct (png_structpp png_ptr_ptr,
-png_infopp info_ptr_ptr);
+\fBvoid png_set_crc_action (png_structp \fP\fIpng_ptr\fP\fB, int \fP\fIcrit_action\fP\fB, int \fIancil_action\fP\fB);\fP
-void png_error (png_structp png_ptr, png_const_charp error);
+\fI\fB
-void png_free (png_structp png_ptr, png_voidp ptr);
+\fBvoid png_set_dither (png_structp \fP\fIpng_ptr\fP\fB, png_colorp \fP\fIpalette\fP\fB, int \fP\fInum_palette\fP\fB, int \fP\fImaximum_colors\fP\fB, png_uint_16p \fP\fIhistogram\fP\fB, int \fIfull_dither\fP\fB);\fP
-void png_free_default(png_structp png_ptr, png_voidp ptr)
+\fI\fB
-png_byte png_get_bit_depth (png_structp png_ptr, png_infop
-info_ptr);
+\fBvoid png_set_error_fn (png_structp \fP\fIpng_ptr\fP\fB, png_voidp \fP\fIerror_ptr\fP\fB, png_error_ptr \fP\fIerror_fn\fP\fB, png_error_ptr \fIwarning_fn\fP\fB);\fP
-png_uint_32 png_get_bKGD (png_structp png_ptr, png_infop
-info_ptr, png_color_16p *background);
+\fI\fB
-png_byte png_get_channels (png_structp png_ptr, png_infop
-info_ptr);
+\fBvoid png_set_expand (png_structp \fIpng_ptr\fP\fB);\fP
-png_uint_32 png_get_cHRM (png_structp png_ptr, png_infop
-info_ptr, double *white_x, double *white_y, double *red_x,
-double *red_y, double *green_x, double *green_y, double
-*blue_x, double *blue_y);
+\fI\fB
-png_byte png_get_color_type (png_structp png_ptr, png_infop
-info_ptr);
+\fBvoid png_set_filler (png_structp \fP\fIpng_ptr\fP\fB, png_uint_32 \fP\fIfiller\fP\fB, int \fIflags\fP\fB);\fP
-png_byte png_get_compression_type (png_structp png_ptr,
-png_infop info_ptr);
+\fI\fB
-png_byte png_get_copyright (png_structp png_ptr);
+\fBvoid png_set_filter (png_structp \fP\fIpng_ptr\fP\fB, int \fP\fImethod\fP\fB, int \fIfilters\fP\fB);\fP
-png_voidp png_get_error_ptr (png_structp png_ptr);
+\fI\fB
-png_byte png_get_filter_type (png_structp png_ptr, png_infop
-info_ptr);
+\fBvoid png_set_filter_heuristics (png_structp \fP\fIpng_ptr\fP\fB, int \fP\fIheuristic_method\fP\fB, int \fP\fInum_weights\fP\fB, png_doublep \fP\fIfilter_weights\fP\fB, png_doublep \fIfilter_costs\fP\fB);\fP
-png_uint_32 png_get_gAMA (png_structp png_ptr, png_infop
-info_ptr, double *file_gamma);
+\fI\fB
-png_byte png_get_header_version (png_structp png_ptr);
+\fBvoid png_set_flush (png_structp \fP\fIpng_ptr\fP\fB, int \fInrows\fP\fB);\fP
-png_uint_32 png_get_hIST (png_structp png_ptr, png_infop
-info_ptr, png_uint_16p *hist);
+\fI\fB
-png_uint_32 png_get_IHDR (png_structp png_ptr, png_infop
-info_ptr, png_uint_32 *width, png_uint_32 *height, int
-*bit_depth, int *color_type, int *interlace_type, int
-*compression_type, int *filter_type);
+\fBvoid png_set_gamma (png_structp \fP\fIpng_ptr\fP\fB, double \fP\fIscreen_gamma\fP\fB, double \fIdefault_file_gamma\fP\fB);\fP
-png_uint_32 png_get_image_height (png_structp png_ptr,
-png_infop info_ptr);
+\fI\fB
-png_uint_32 png_get_image_width (png_structp png_ptr, png_infop
-info_ptr);
+\fBvoid png_set_gAMA (png_structp \fP\fIpng_ptr\fP\fB, png_infop \fP\fIinfo_ptr\fP\fB, double \fIfile_gamma\fP\fB);\fP
-png_byte png_get_interlace_type (png_structp png_ptr, png_infop
-info_ptr);
+\fI\fB
-png_voidp png_get_io_ptr (png_structp png_ptr);
+\fBvoid png_set_gAMA_fixed (png_structp \fP\fIpng_ptr\fP\fB, png_infop \fP\fIinfo_ptr\fP\fB, png_uint_32 \fIfile_gamma\fP\fB);\fP
-png_voidp png_get_mem_ptr(png_structp png_ptr)
+\fI\fB
-png_uint_32 png_get_oFFs (png_structp png_ptr, png_infop
-info_ptr, png_uint_32 *offset_x, png_uint_32 *offset_y, int
-*unit_type);
+\fBvoid png_set_gray_1_2_4_to_8(png_structp \fIpng_ptr\fP\fB);\fP
-png_uint_32 png_get_pCAL (png_structp png_ptr, png_infop
-info_ptr, png_charp *purpose, png_int_32 *X0, png_int_32 *X1,
-int *type, int *nparams, png_charp *units, png_charpp *params);
+\fI\fB
-png_uint_32 png_get_pHYs (png_structp png_ptr, png_infop
-info_ptr, png_uint_32 *res_x, png_uint_32 *res_y, int
-*unit_type);
+\fBvoid png_set_gray_to_rgb (png_structp \fIpng_ptr\fP\fB);\fP
-float png_get_pixel_aspect_ratio (png_structp png_ptr,
-png_infop info_ptr);
+\fI\fB
-png_uint_32 png_get_pixels_per_meter (png_structp png_ptr,
-png_infop info_ptr);
+\fBvoid png_set_hIST (png_structp \fP\fIpng_ptr\fP\fB, png_infop \fP\fIinfo_ptr\fP\fB, png_uint_16p \fIhist\fP\fB);\fP
-png_voidp png_get_progressive_ptr (png_structp png_ptr);
+\fI\fB
-png_uint_32 png_get_PLTE (png_structp png_ptr, png_infop
-info_ptr, png_colorp *palette, int *num_palette);
+\fBvoid png_set_iCCP (png_structp \fP\fIpng_ptr\fP\fB, png_infop \fP\fIinfo_ptr\fP\fB, png_charp \fP\fIname\fP\fB, int \fP\fIcompression_type\fP\fB, png_charp \fP\fIprofile\fP\fB, png_uint_32 \fIproflen\fP\fB);\fP
-png_byte png_get_rgb_to_gray_status (png_structp png_ptr)
+\fI\fB
-png_uint_32 png_get_rowbytes (png_structp png_ptr, png_infop
-info_ptr);
+\fBint png_set_interlace_handling (png_structp \fIpng_ptr\fP\fB);\fP
-png_uint_32 png_get_sBIT (png_structp png_ptr, png_infop
-info_ptr, png_color_8p *sig_bit);
+\fI\fB
-png_bytep png_get_signature (png_structp png_ptr, png_infop
-info_ptr);
+\fBvoid png_set_invalid (png_structp \fP\fIpng_ptr\fP\fB, png_infop \fP\fIinfo_ptr\fP\fB, int \fImask\fP\fB);\fP
-png_uint_32 png_get_sRGB (png_structp png_ptr, png_infop
-info_ptr, int *intent);
+\fI\fB
-png_uint_32 png_get_text (png_structp png_ptr, png_infop
-info_ptr, png_textp *text_ptr, int *num_text);
+\fBvoid png_set_invert_alpha (png_structp \fIpng_ptr\fP\fB);\fP
-png_uint_32 png_get_tIME (png_structp png_ptr, png_infop
-info_ptr, png_timep *mod_time);
+\fI\fB
-png_uint_32 png_get_tRNS (png_structp png_ptr, png_infop
-info_ptr, png_bytep *trans, int *num_trans, png_color_16p
-*trans_values);
+\fBvoid png_set_invert_mono (png_structp \fIpng_ptr\fP\fB);\fP
-png_uint_32 png_get_valid (png_structp png_ptr, png_infop
-info_ptr, png_uint_32 flag);
+\fI\fB
-png_uint_32 png_get_x_offset_microns (png_structp png_ptr,
-png_infop info_ptr);
+\fBvoid png_set_IHDR (png_structp \fP\fIpng_ptr\fP\fB, png_infop \fP\fIinfo_ptr\fP\fB, png_uint_32 \fP\fIwidth\fP\fB, png_uint_32 \fP\fIheight\fP\fB, int \fP\fIbit_depth\fP\fB, int \fP\fIcolor_type\fP\fB, int \fP\fIinterlace_type\fP\fB, int \fP\fIcompression_type\fP\fB, int \fIfilter_type\fP\fB);\fP
-png_uint_32 png_get_x_offset_pixels (png_structp png_ptr,
-png_infop info_ptr);
+\fI\fB
-png_uint_32 png_get_x_pixels_per_meter (png_structp png_ptr,
-png_infop info_ptr);
+\fBvoid png_set_keep_unknown_chunks (png_structp \fP\fIpng_ptr\fP\fB, int \fP\fIkeep\fP\fB, png_bytep \fP\fIchunk_list\fP\fB, int \fInum_chunks\fP\fB);\fP
-png_uint_32 png_get_y_offset_microns (png_structp png_ptr,
-png_infop info_ptr);
+\fI\fB
-png_uint_32 png_get_y_offset_pixels (png_structp png_ptr,
-png_infop info_ptr);
+\fBvoid png_set_mem_fn(png_structp \fP\fIpng_ptr\fP\fB, png_voidp \fP\fImem_ptr\fP\fB, png_malloc_ptr \fP\fImalloc_fn\fP\fB, png_free_ptr \fIfree_fn\fP\fB);\fP
-png_uint_32 png_get_y_pixels_per_meter (png_structp png_ptr,
-png_infop info_ptr);
+\fI\fB
-void png_info_init (png_infop info_ptr);
+\fBpng_set_mmx_thresholds (png_structp \fP\fIpng_ptr\fP\fB, png_byte \fP\fImmx_bitdepth_threshold\fP\fB, png_uint_32 \fImmx_rowbytes_threshold\fP\fB);\fP
-void png_init_io (png_structp png_ptr, FILE *fp);
+\fI\fB
-png_voidp png_malloc (png_structp png_ptr, png_uint_32 size);
+\fBvoid png_set_oFFs (png_structp \fP\fIpng_ptr\fP\fB, png_infop \fP\fIinfo_ptr\fP\fB, png_uint_32 \fP\fIoffset_x\fP\fB, png_uint_32 \fP\fIoffset_y\fP\fB, int \fIunit_type\fP\fB);\fP
-png_voidp png_malloc_default(png_structp png_ptr,
-png_uint_32 size)
+\fI\fB
-voidp png_memcpy (png_voidp s1, png_voidp s2, png_size_t size);
+\fBvoid png_set_packing (png_structp \fIpng_ptr\fP\fB);\fP
-png_voidp png_memcpy_check (png_structp png_ptr, png_voidp s1,
-png_voidp s2, png_uint_32 size);
+\fI\fB
-voidp png_memset (png_voidp s1, int value, png_size_t size);
+\fBvoid png_set_packswap (png_structp \fIpng_ptr\fP\fB);\fP
-png_voidp png_memset_check (png_structp png_ptr, png_voidp
-s1, int value, png_uint_32 size);
+\fI\fB
-void png_process_data (png_structp png_ptr, png_infop info_ptr,
-png_bytep buffer, png_size_t buffer_size);
+\fBvoid png_set_palette_to_rgb(png_structp \fIpng_ptr\fP\fB);\fP
-void png_progressive_combine_row (png_structp png_ptr,
-png_bytep old_row, png_bytep new_row);
+\fI\fB
-void png_read_destroy (png_structp png_ptr, png_infop info_ptr,
-png_infop end_info_ptr);
+\fBvoid png_set_pCAL (png_structp \fP\fIpng_ptr\fP\fB, png_infop \fP\fIinfo_ptr\fP\fB, png_charp \fP\fIpurpose\fP\fB, png_int_32 \fP\fIX0\fP\fB, png_int_32 \fP\fIX1\fP\fB, int \fP\fItype\fP\fB, int \fP\fInparams\fP\fB, png_charp \fP\fIunits\fP\fB, png_charpp \fIparams\fP\fB);\fP
-void png_read_end (png_structp png_ptr, png_infop info_ptr);
+\fI\fB
-void png_read_image (png_structp png_ptr, png_bytepp image);
+\fBvoid png_set_pHYs (png_structp \fP\fIpng_ptr\fP\fB, png_infop \fP\fIinfo_ptr\fP\fB, png_uint_32 \fP\fIres_x\fP\fB, png_uint_32 \fP\fIres_y\fP\fB, int \fIunit_type\fP\fB);\fP
-void png_read_info (png_structp png_ptr, png_infop info_ptr);
+\fI\fB
-void png_read_row (png_structp png_ptr, png_bytep row,
-png_bytep display_row);
+\fBvoid png_set_progressive_read_fn (png_structp \fP\fIpng_ptr\fP\fB, png_voidp \fP\fIprogressive_ptr\fP\fB, png_progressive_info_ptr \fP\fIinfo_fn\fP\fB, png_progressive_row_ptr \fP\fIrow_fn\fP\fB, png_progressive_end_ptr \fIend_fn\fP\fB);\fP
-void png_read_rows (png_structp png_ptr, png_bytepp row,
-png_bytepp display_row, png_uint_32 num_rows);
+\fI\fB
-void png_read_update_info (png_structp png_ptr, png_infop
-info_ptr);
+\fBvoid png_set_PLTE (png_structp \fP\fIpng_ptr\fP\fB, png_infop \fP\fIinfo_ptr\fP\fB, png_colorp \fP\fIpalette\fP\fB, int \fInum_palette\fP\fB);\fP
-void png_set_background (png_structp png_ptr, png_color_16p
-background_color, int background_gamma_code, int need_expand,
-double background_gamma);
+\fI\fB
-void png_set_bgr (png_structp png_ptr);
+\fBvoid png_set_read_fn (png_structp \fP\fIpng_ptr\fP\fB, png_voidp \fP\fIio_ptr\fP\fB, png_rw_ptr \fIread_data_fn\fP\fB);\fP
-void png_set_bKGD (png_structp png_ptr, png_infop info_ptr,
-png_color_16p background);
+\fI\fB
-void png_set_cHRM (png_structp png_ptr, png_infop info_ptr,
-double white_x, double white_y, double red_x, double red_y,
-double green_x, double green_y, double blue_x, double blue_y);
+\fBvoid png_set_read_status_fn (png_structp \fP\fIpng_ptr\fP\fB, png_read_status_ptr \fIread_row_fn\fP\fB);\fP
-void png_set_compression_level (png_structp png_ptr, int
-level);
+\fI\fB
-void png_set_compression_mem_level (png_structp png_ptr, int
-mem_level);
+\fBvoid png_set_read_user_transform_fn (png_structp \fP\fIpng_ptr\fP\fB, png_user_transform_ptr \fIread_user_transform_fn\fP\fB);\fP
-void png_set_compression_method (png_structp png_ptr, int
-method);
+\fI\fB
-void png_set_compression_strategy (png_structp png_ptr, int
-strategy);
+\fBvoid png_set_rgb_to_gray (png_structp \fP\fIpng_ptr\fP\fB, int \fP\fIerror_action\fP\fB, double \fP\fIred\fP\fB, double \fIgreen\fP\fB);\fP
-void png_set_compression_window_bits (png_structp png_ptr, int
-window_bits);
+\fI\fB
-void png_set_crc_action (png_structp png_ptr, int crit_action,
-int ancil_action);
+\fBvoid png_set_rgb_to_gray_fixed (png_structp \fP\fIpng_ptr\fP\fB, int error_action png_fixed_point \fP\fIred\fP\fB, png_fixed_point \fIgreen\fP\fB);\fP
-void png_set_dither (png_structp png_ptr, png_colorp palette,
-int num_palette, int maximum_colors, png_uint_16p histogram,
-int full_dither);
+\fI\fB
-void png_set_error_fn (png_structp png_ptr, png_voidp
-error_ptr, png_error_ptr error_fn, png_error_ptr warning_fn);
+\fBvoid png_set_rows (png_structp \fP\fIpng_ptr\fP\fB, png_infop \fP\fIinfo_ptr\fP\fB, png_bytepp \fIrow_pointers\fP\fB);\fP
-void png_set_expand (png_structp png_ptr);
+\fI\fB
-void png_set_filler (png_structp png_ptr, png_uint_32 filler,
-int flags);
+\fBvoid png_set_sBIT (png_structp \fP\fIpng_ptr\fP\fB, png_infop \fP\fIinfo_ptr\fP\fB, png_color_8p \fIsig_bit\fP\fB);\fP
-void png_set_filter (png_structp png_ptr, int method, int
-filters);
+\fI\fB
-void png_set_filter_heuristics (png_structp png_ptr, int
-heuristic_method, int num_weights, png_doublep filter_weights,
-png_doublep filter_costs);
+\fBvoid png_set_sCAL (png_structp \fP\fIpng_ptr\fP\fB, png_infop \fP\fIinfo_ptr\fP\fB, png_charp \fP\fIunit\fP\fB, double \fP\fIwidth\fP\fB, double \fIheight\fP\fB);\fP
-void png_set_flush (png_structp png_ptr, int nrows);
+\fI\fB
-void png_set_gamma (png_structp png_ptr, double screen_gamma,
-double default_file_gamma);
+\fBvoid png_set_shift (png_structp \fP\fIpng_ptr\fP\fB, png_color_8p \fItrue_bits\fP\fB);\fP
-void png_set_gAMA (png_structp png_ptr, png_infop info_ptr,
-double file_gamma);
+\fI\fB
-void png_set_gray_to_rgb (png_structp png_ptr);
+\fBvoid png_set_sig_bytes (png_structp \fP\fIpng_ptr\fP\fB, int \fInum_bytes\fP\fB);\fP
-void png_set_hIST (png_structp png_ptr, png_infop info_ptr,
-png_uint_16p hist);
+\fI\fB
-int png_set_interlace_handling (png_structp png_ptr);
+\fBvoid png_set_sPLT (png_structp \fP\fIpng_ptr\fP\fB, png_infop \fP\fIinfo_ptr\fP\fB, png_spalette_p \fP\fIsplt_ptr\fP\fB, int \fInum_spalettes\fP\fB);\fP
-void png_set_invert_alpha (png_structp png_ptr);
+\fI\fB
-void png_set_invert_mono (png_structp png_ptr);
+\fBvoid png_set_sRGB (png_structp \fP\fIpng_ptr\fP\fB, png_infop \fP\fIinfo_ptr\fP\fB, int \fIintent\fP\fB);\fP
-void png_set_IHDR (png_structp png_ptr, png_infop info_ptr,
-png_uint_32 width, png_uint_32 height, int bit_depth, int
-color_type, int interlace_type, int compression_type, int
-filter_type);
+\fI\fB
-void png_set_mem_fn(png_structp png_ptr, png_voidp mem_ptr,
-png_malloc_ptr malloc_fn, png_free_ptr free_fn)
+\fBvoid png_set_sRGB_gAMA_and_cHRM (png_structp \fP\fIpng_ptr\fP\fB, png_infop \fP\fIinfo_ptr\fP\fB, int \fIintent\fP\fB);\fP
-void png_set_oFFs (png_structp png_ptr, png_infop info_ptr,
-png_uint_32 offset_x, png_uint_32 offset_y, int unit_type);
+\fI\fB
-void png_set_packing (png_structp png_ptr);
+\fBvoid png_set_strip_16 (png_structp \fIpng_ptr\fP\fB);\fP
-void png_set_packswap (png_structp png_ptr);
+\fI\fB
-void png_set_pCAL (png_structp png_ptr, png_infop info_ptr,
-png_charp purpose, png_int_32 X0, png_int_32 X1, int type, int
-nparams, png_charp units, png_charpp params);
+\fBvoid png_set_strip_alpha (png_structp \fIpng_ptr\fP\fB);\fP
-void png_set_pHYs (png_structp png_ptr, png_infop info_ptr,
-png_uint_32 res_x, png_uint_32 res_y, int unit_type);
+\fI\fB
-void png_set_progressive_read_fn (png_structp png_ptr,
-png_voidp progressive_ptr, png_progressive_info_ptr info_fn,
-png_progressive_row_ptr row_fn, png_progressive_end_ptr
-end_fn);
+\fBvoid png_set_strip_error_numbers (png_structp \fIpng_ptr,
-void png_set_PLTE (png_structp png_ptr, png_infop info_ptr,
-png_colorp palette, int num_palette);
+\fBpng_uint_32 \fIstrip_mode\fP\fB);\fP
-void png_set_read_fn (png_structp png_ptr, png_voidp io_ptr,
-png_rw_ptr read_data_fn);
+\fI\fB
-void png_set_read_status_fn (png_structp png_ptr, png_read_status_ptr
-read_row_fn);
+\fBvoid png_set_swap (png_structp \fIpng_ptr\fP\fB);\fP
-void png_set_read_user_transform_fn (png_structp png_ptr,
-png_user_transform_ptr read_user_transform_fn);
+\fI\fB
-void png_set_rgb_to_gray (png_structp png_ptr, int error_action);
+\fBvoid png_set_swap_alpha (png_structp \fIpng_ptr\fP\fB);\fP
-void png_set_sBIT (png_structp png_ptr, png_infop info_ptr,
-png_color_8p sig_bit);
+\fI\fB
-void png_set_shift (png_structp png_ptr, png_color_8p
-true_bits);
+\fBvoid png_set_text (png_structp \fP\fIpng_ptr\fP\fB, png_infop \fP\fIinfo_ptr\fP\fB, png_textp \fP\fItext_ptr\fP\fB, int \fInum_text\fP\fB);\fP
-void png_set_sig_bytes (png_structp png_ptr, int num_bytes);
+\fI\fB
-void png_set_sRGB (png_structp png_ptr, png_infop info_ptr, int
-intent);
+\fBvoid png_set_tIME (png_structp \fP\fIpng_ptr\fP\fB, png_infop \fP\fIinfo_ptr\fP\fB, png_timep \fImod_time\fP\fB);\fP
-void png_set_sRGB_gAMA_and_cHRM (png_structp png_ptr, png_infop
-info_ptr, int intent);
+\fI\fB
-void png_set_strip_16 (png_structp png_ptr);
+\fBvoid png_set_tRNS (png_structp \fP\fIpng_ptr\fP\fB, png_infop \fP\fIinfo_ptr\fP\fB, png_bytep \fP\fItrans\fP\fB, int \fP\fInum_trans\fP\fB, png_color_16p \fItrans_values\fP\fB);\fP
-void png_set_strip_alpha (png_structp png_ptr);
+\fI\fB
-void png_set_swap (png_structp png_ptr);
+\fBvoid png_set_tRNS_to_alpha(png_structp \fIpng_ptr\fP\fB);\fP
-void png_set_swap_alpha (png_structp png_ptr);
+\fI\fB
-void png_set_text (png_structp png_ptr, png_infop info_ptr,
-png_textp text_ptr, int num_text);
+\fBpng_uint_32 png_set_unknown_chunks (png_structp \fP\fIpng_ptr\fP\fB, png_infop \fP\fIinfo_ptr\fP\fB, png_unknown_chunkp \fP\fIunknowns\fP\fB, int \fP\fInum\fP\fB, int \fIlocation\fP\fB);\fP
-void png_set_tIME (png_structp png_ptr, png_infop info_ptr,
-png_timep mod_time);
+\fI\fB
-void png_set_tRNS (png_structp png_ptr, png_infop info_ptr,
-png_bytep trans, int num_trans, png_color_16p trans_values);
+\fBvoid png_set_unknown_chunk_location(png_structp \fP\fIpng_ptr\fP\fB, png_infop \fP\fIinfo_ptr\fP\fB, int \fP\fIchunk\fP\fB, int \fIlocation\fP\fB);\fP
-void png_set_write_fn (png_structp png_ptr, png_voidp io_ptr,
-png_rw_ptr write_data_fn, png_flush_ptr output_flush_fn);
+\fI\fB
-void png_set_write_status_fn (png_structp png_ptr, png_write_status_ptr
-write_row_fn);
+\fBvoid png_set_read_user_chunk_fn (png_structp \fP\fIpng_ptr\fP\fB, png_voidp \fP\fIuser_chunk_ptr\fP\fB, png_user_chunk_ptr \fIread_user_chunk_fn\fP\fB);\fP
-void png_set_write_user_transform_fn (png_structp png_ptr,
-png_user_transform_ptr write_user_transform_fn);
+\fI\fB
-int png_sig_cmp (png_bytep sig, png_size_t start, png_size_t
-num_to_check);
+\fBvoid png_set_user_transform_info (png_structp \fP\fIpng_ptr\fP\fB, png_voidp \fP\fIuser_transform_ptr\fP\fB, int \fP\fIuser_transform_depth\fP\fB, int \fIuser_transform_channels\fP\fB);\fP
-void png_start_read_image (png_structp png_ptr);
+\fI\fB
-void png_warning (png_structp png_ptr, png_const_charp
-message);
+\fBvoid png_set_write_fn (png_structp \fP\fIpng_ptr\fP\fB, png_voidp \fP\fIio_ptr\fP\fB, png_rw_ptr \fP\fIwrite_data_fn\fP\fB, png_flush_ptr \fIoutput_flush_fn\fP\fB);\fP
-void png_write_chunk (png_structp png_ptr, png_bytep
-chunk_name, png_bytep data, png_size_t length);
+\fI\fB
-void png_write_chunk_data (png_structp png_ptr, png_bytep data,
-png_size_t length);
+\fBvoid png_set_write_status_fn (png_structp \fP\fIpng_ptr\fP\fB, png_write_status_ptr \fIwrite_row_fn\fP\fB);\fP
-void png_write_chunk_end (png_structp png_ptr);
+\fI\fB
-void png_write_chunk_start (png_structp png_ptr, png_bytep
-chunk_name, png_uint_32 length);
+\fBvoid png_set_write_user_transform_fn (png_structp \fP\fIpng_ptr\fP\fB, png_user_transform_ptr \fIwrite_user_transform_fn\fP\fB);\fP
-void png_write_destroy (png_structp png_ptr);
+\fI\fB
-void png_write_destroy_info (png_infop info_ptr);
+\fBvoid png_set_compression_buffer_size(png_structp \fP\fIpng_ptr\fP\fB, png_uint_32 \fIsize\fP\fB);\fP
-void png_write_end (png_structp png_ptr, png_infop info_ptr);
+\fI\fB
-void png_write_flush (png_structp png_ptr);
+\fBint png_sig_cmp (png_bytep \fP\fIsig\fP\fB, png_size_t \fP\fIstart\fP\fB, png_size_t \fInum_to_check\fP\fB);\fP
-void png_write_image (png_structp png_ptr, png_bytepp image);
+\fI\fB
-void png_write_info (png_structp png_ptr, png_infop info_ptr);
+\fBvoid png_start_read_image (png_structp \fIpng_ptr\fP\fB);\fP
-void png_write_row (png_structp png_ptr, png_bytep row);
+\fI\fB
-void png_write_rows (png_structp png_ptr, png_bytepp row,
-png_uint_32 num_rows);
+\fBvoid png_warning (png_structp \fP\fIpng_ptr\fP\fB, png_const_charp \fImessage\fP\fB);\fP
+
+\fI\fB
+
+\fBvoid png_write_chunk (png_structp \fP\fIpng_ptr\fP\fB, png_bytep \fP\fIchunk_name\fP\fB, png_bytep \fP\fIdata\fP\fB, png_size_t \fIlength\fP\fB);\fP
+
+\fI\fB
+
+\fBvoid png_write_chunk_data (png_structp \fP\fIpng_ptr\fP\fB, png_bytep \fP\fIdata\fP\fB, png_size_t \fIlength\fP\fB);\fP
+
+\fI\fB
+
+\fBvoid png_write_chunk_end (png_structp \fIpng_ptr\fP\fB);\fP
+
+\fI\fB
+
+\fBvoid png_write_chunk_start (png_structp \fP\fIpng_ptr\fP\fB, png_bytep \fP\fIchunk_name\fP\fB, png_uint_32 \fIlength\fP\fB);\fP
+
+\fI\fB
+
+\fBvoid png_write_destroy (png_structp \fIpng_ptr\fP\fB);\fP
+
+\fI\fB
+
+\fBvoid png_write_end (png_structp \fP\fIpng_ptr\fP\fB, png_infop \fIinfo_ptr\fP\fB);\fP
+
+\fI\fB
+
+\fBvoid png_write_flush (png_structp \fIpng_ptr\fP\fB);\fP
+
+\fI\fB
+
+\fBvoid png_write_image (png_structp \fP\fIpng_ptr\fP\fB, png_bytepp \fIimage\fP\fB);\fP
+
+\fI\fB
+
+\fBDEPRECATED: void png_write_init (png_structp \fIpng_ptr\fP\fB);\fP
+
+\fI\fB
+
+\fBDEPRECATED: void png_write_init_2 (png_structpp \fP\fIptr_ptr\fP\fB, png_const_charp \fP\fIuser_png_ver\fP\fB, png_size_t \fP\fIpng_struct_size\fP\fB, png_size_t \fIpng_info_size\fP\fB);\fP
+
+\fI\fB
+
+\fBvoid png_write_info (png_structp \fP\fIpng_ptr\fP\fB, png_infop \fIinfo_ptr\fP\fB);\fP
+
+\fI\fB
+
+\fBvoid png_write_info_before_PLTE (png_structp \fP\fIpng_ptr\fP\fB, png_infop \fIinfo_ptr\fP\fB);\fP
+
+\fI\fB
+
+\fBvoid png_write_png (png_structp \fP\fIpng_ptr\fP\fB, png_infop \fP\fIinfo_ptr\fP\fB, int \fP\fItransforms\fP\fB, png_voidp \fIparams\fP\fB);\fP
+
+\fI\fB
+
+\fBvoid png_write_row (png_structp \fP\fIpng_ptr\fP\fB, png_bytep \fIrow\fP\fB);\fP
+
+\fI\fB
+
+\fBvoid png_write_rows (png_structp \fP\fIpng_ptr\fP\fB, png_bytepp \fP\fIrow\fP\fB, png_uint_32 \fInum_rows\fP\fB);\fP
+
+\fI\fB
.SH DESCRIPTION
The
.SH LIBPNG.TXT
libpng.txt - A description on how to use and modify libpng
- libpng version 1.0.3 - January 14, 1999
+ libpng version 1.2.4 - July 8, 2002
Updated and distributed by Glenn Randers-Pehrson
- <randeg@alumni.rpi.edu>
- Copyright (c) 1998, 1999 Glenn Randers-Pehrson
+ <randeg@alum.rpi.edu>
+ Copyright (c) 1998-2002 Glenn Randers-Pehrson
For conditions of distribution and use, see copyright
notice in png.h.
Schalnat, Group 42, Inc.
Updated/rewritten per request in the libpng FAQ
- Copyright (c) 1995 Frank J. T. Wojcik
- December 18, 1995 && January 20, 1996
+ Copyright (c) 1995, 1996 Frank J. T. Wojcik
+ December 18, 1995 & January 20, 1996
.SH I. Introduction
Libpng was written as a companion to the PNG specification, as a way
of reducing the amount of time and effort it takes to support the PNG
-file format in application programs. The PNG specification is available
+file format in application programs.
+
+The PNG-1.2 specification is available at <http://www.libpng.org/pub/png>
+and at <ftp://ftp.uu.net/graphics/png/documents/>.
+
+The PNG-1.0 specification is available
as RFC 2083 <ftp://ftp.uu.net/graphics/png/documents/> and as a
W3C Recommendation <http://www.w3.org/TR/REC.png.html>. Some
additional chunks are described in the special-purpose public chunks
-documents at <ftp://ftp.uu.net/graphics/png/documents/>. Other information
+documents at <ftp://ftp.uu.net/graphics/png/documents/>.
+
+Other information
about PNG, and the latest version of libpng, can be found at the PNG home
-page, <http://www.cdrom.com/pub/png/>.
+page, <http://www.libpng.org/pub/png/>
+and at <ftp://ftp.uu.net/graphics/png/>.
Most users will not have to modify the library significantly; advanced
users may want to modify it more. All attempts were made to make it as
Libpng uses zlib for its compression and decompression of PNG files.
Further information about zlib, and the latest version of zlib, can
-be found at the zlib home page, <http://www.cdrom.com/pub/infozip/zlib/>.
+be found at the zlib home page, <http://www.info-zip.org/pub/infozip/zlib/>.
The zlib compression utility is a general purpose utility that is
useful for more than PNG files, and can be used without libpng.
See the documentation delivered with zlib for more details.
instances of the structures. Each thread should have its own
png_struct and png_info instances, and thus its own image.
Libpng does not protect itself against two threads using the
-same instance of a structure.
+same instance of a structure. Note: thread safety may be defeated
+by use of some of the MMX assembler code in pnggccrd.c, which is only
+compiled when the user defines PNG_THREAD_UNSAFE_OK.
.SH II. Structures
PNG file. At one time, the fields of png_info were intended to be
directly accessible to the user. However, this tended to cause problems
with applications using dynamically loaded libraries, and as a result
-a set of interface functions for png_info was developed. The fields
-of png_info are still available for older applications, but it is
-suggested that applications use the new interfaces if at all possible.
+a set of interface functions for png_info (the png_get_*() and png_set_*()
+functions) was developed. The fields of png_info are still available for
+older applications, but it is suggested that applications use the new
+interfaces if at all possible.
+
+Applications that do make direct access to the members of png_struct (except
+for png_ptr->jmpbuf) must be recompiled whenever the library is updated,
+and applications that make direct access to the members of png_info must
+be recompiled if they were compiled or loaded with libpng version 1.0.6,
+in which the members were in a different order. In version 1.0.7, the
+members of the png_info structure reverted to the old order, as they were
+in versions 0.97c through 1.0.5. Starting with version 2.0.0, both
+structures are going to be hidden, and the contents of the structures will
+only be accessible through the png_get/png_set functions.
The png.h header file is an invaluable reference for programming with libpng.
And while I'm on the topic, make sure you include the libpng header file:
.SH III. Reading
-Reading PNG files:
-
We'll now walk you through the possible functions to call when reading
-in a PNG file, briefly explaining the syntax and purpose of each one.
-See example.c and png.h for more detail. While Progressive reading
-is covered in the next section, you will still need some of the
-functions discussed in this section to read a PNG file.
+in a PNG file sequentially, briefly explaining the syntax and purpose
+of each one. See example.c and png.h for more detail. While
+progressive reading is covered in the next section, you will still
+need some of the functions discussed in this section to read a PNG
+file.
+
+.SS Setup
You will want to do the I/O initialization(*) before you get into libpng,
so if it doesn't work, you don't have much to undo. Of course, you
will also want to insure that you are, in fact, dealing with a PNG
file. Libpng provides a simple check to see if a file is a PNG file.
-To use it, pass in the first 1 to 8 bytes of the file, and it will
-return true or false (1 or 0) depending on whether the bytes could be
-part of a PNG file. Of course, the more bytes you pass in, the
-greater the accuracy of the prediction.
+To use it, pass in the first 1 to 8 bytes of the file to the function
+png_sig_cmp(), and it will return 0 if the bytes match the corresponding
+bytes of the PNG signature, or nonzero otherwise. Of course, the more bytes
+you pass in, the greater the accuracy of the prediction.
If you are intending to keep the file pointer open for use in libpng,
you must ensure you don't read more than 8 bytes from the beginning
FILE *fp = fopen(file_name, "rb");
if (!fp)
{
- return;
+ return (ERROR);
}
fread(header, 1, number, fp);
is_png = !png_sig_cmp(header, 0, number);
if (!is_png)
{
- return;
+ return (NOT_PNG);
}
use by the error functions, if necessary (the pointer and functions can
be NULL if the default error handlers are to be used). See the section
on Changes to Libpng below regarding the old initialization functions.
+The structure allocation functions quietly return NULL if they fail to
+create the structure, so your application should check for that.
png_structp png_ptr = png_create_read_struct
(PNG_LIBPNG_VER_STRING, (png_voidp)user_error_ptr,
user_error_fn, user_warning_fn);
if (!png_ptr)
- return;
+ return (ERROR);
png_infop info_ptr = png_create_info_struct(png_ptr);
if (!info_ptr)
{
png_destroy_read_struct(&png_ptr,
(png_infopp)NULL, (png_infopp)NULL);
- return;
+ return (ERROR);
}
png_infop end_info = png_create_info_struct(png_ptr);
{
png_destroy_read_struct(&png_ptr, &info_ptr,
(png_infopp)NULL);
- return;
+ return (ERROR);
}
If you want to use your own memory allocation routines,
When libpng encounters an error, it expects to longjmp back
to your routine. Therefore, you will need to call setjmp and pass
-your png_ptr->jmpbuf. If you read the file from different
+your png_jmpbuf(png_ptr). If you read the file from different
routines, you will need to update the jmpbuf field every time you enter
-a new routine that will call a png_ function.
+a new routine that will call a png_*() function.
See your documentation of setjmp/longjmp for your compiler for more
-handling in the Customizing Libpng section below for more information on
-the libpng error handling. If an error occurs, and libpng longjmp's
+information on setjmp/longjmp. See the discussion on libpng error
+handling in the Customizing Libpng section below for more information
+on the libpng error handling. If an error occurs, and libpng longjmp's
back to your setjmp, you will want to call png_destroy_read_struct() to
free any memory.
- if (setjmp(png_ptr->jmpbuf))
+ if (setjmp(png_jmpbuf(png_ptr)))
{
png_destroy_read_struct(&png_ptr, &info_ptr,
&end_info);
fclose(fp);
- return;
+ return (ERROR);
}
+If you would rather avoid the complexity of setjmp/longjmp issues,
+you can compile libpng with PNG_SETJMP_NOT_SUPPORTED, in which case
+errors will result in a call to PNG_ABORT() which defaults to abort().
+
Now you need to set up the input code. The default for libpng is to
use the C function fread(). If you use this, you will need to pass a
valid FILE * in the function png_init_io(). Be sure that the file is
png_set_sig_bytes(png_ptr, number);
+.SS Setting up callback code
+
+You can set up a callback function to handle any unknown chunks in the
+input stream. You must supply the function
+
+ read_chunk_callback(png_ptr ptr,
+ png_unknown_chunkp chunk);
+ {
+ /* The unknown chunk structure contains your
+ chunk data: */
+ png_byte name[5];
+ png_byte *data;
+ png_size_t size;
+ /* Note that libpng has already taken care of
+ the CRC handling */
+
+ /* put your code here. Return one of the
+ following: */
+
+ return (-n); /* chunk had an error */
+ return (0); /* did not recognize */
+ return (n); /* success */
+ }
+
+(You can give your function another name that you like instead of
+"read_chunk_callback")
+
+To inform libpng about your function, use
+
+ png_set_read_user_chunk_fn(png_ptr, user_chunk_ptr,
+ read_chunk_callback);
+
+This names not only the callback function, but also a user pointer that
+you can retrieve with
+
+ png_get_user_chunk_ptr(png_ptr);
+
At this point, you can set up a callback function that will be
called after each row has been read, which you can use to control
a progress meter or the like. It's demonstrated in pngtest.c.
You must supply a function
- void read_row_callback(png_ptr, png_uint_32 row, int pass);
+ void read_row_callback(png_ptr ptr, png_uint_32 row,
+ int pass);
{
/* put your code here */
}
png_set_read_status_fn(png_ptr, read_row_callback);
-In PNG files, the alpha channel in an image is the level of opacity.
-If you need the alpha channel in an image to be the level of transparency
-instead of opacity, you can invert the alpha channel (or the tRNS chunk
-data) after it's read, so that 0 is fully opaque and 255 (in 8-bit or
-paletted images) or 65535 (in 16-bit images) is fully transparent, with
+.SS Unknown-chunk handling
+
+Now you get to set the way the library processes unknown chunks in the
+input PNG stream. Both known and unknown chunks will be read. Normal
+behavior is that known chunks will be parsed into information in
+various info_ptr members; unknown chunks will be discarded. To change
+this, you can call:
+
+ png_set_keep_unknown_chunks(png_ptr, info_ptr, keep,
+ chunk_list, num_chunks);
+ keep - 0: do not keep
+ 1: keep only if safe-to-copy
+ 2: keep even if unsafe-to-copy
+ chunk_list - list of chunks affected (a byte string,
+ five bytes per chunk, NULL or '\0' if
+ num_chunks is 0)
+ num_chunks - number of chunks affected; if 0, all
+ unknown chunks are affected
+
+Unknown chunks declared in this way will be saved as raw data onto a
+list of png_unknown_chunk structures. If a chunk that is normally
+known to libpng is named in the list, it will be handled as unknown,
+according to the "keep" directive. If a chunk is named in successive
+instances of png_set_keep_unknown_chunks(), the final instance will
+take precedence.
+
+.SS The high-level read interface
+
+At this point there are two ways to proceed; through the high-level
+read interface, or through a sequence of low-level read operations.
+You can use the high-level interface if (a) you are willing to read
+the entire image into memory, and (b) the input transformations
+you want to do are limited to the following set:
+
+ PNG_TRANSFORM_IDENTITY No transformation
+ PNG_TRANSFORM_STRIP_16 Strip 16-bit samples to
+ 8 bits
+ PNG_TRANSFORM_STRIP_ALPHA Discard the alpha channel
+ PNG_TRANSFORM_PACKING Expand 1, 2 and 4-bit
+ samples to bytes
+ PNG_TRANSFORM_PACKSWAP Change order of packed
+ pixels to LSB first
+ PNG_TRANSFORM_EXPAND Perform set_expand()
+ PNG_TRANSFORM_INVERT_MONO Invert monochrome images
+ PNG_TRANSFORM_SHIFT Normalize pixels to the
+ sBIT depth
+ PNG_TRANSFORM_BGR Flip RGB to BGR, RGBA
+ to BGRA
+ PNG_TRANSFORM_SWAP_ALPHA Flip RGBA to ARGB or GA
+ to AG
+ PNG_TRANSFORM_INVERT_ALPHA Change alpha from opacity
+ to transparency
+ PNG_TRANSFORM_SWAP_ENDIAN Byte-swap 16-bit samples
+
+(This excludes setting a background color, doing gamma transformation,
+dithering, and setting filler.) If this is the case, simply do this:
+
+ png_read_png(png_ptr, info_ptr, png_transforms, NULL)
+
+where png_transforms is an integer containing the logical OR of
+some set of transformation flags. This call is equivalent to png_read_info(),
+followed the set of transformations indicated by the transform mask,
+then png_read_image(), and finally png_read_end().
+
+(The final parameter of this call is not yet used. Someday it might point
+to transformation parameters required by some future input transform.)
+
+After you have called png_read_png(), you can retrieve the image data
+with
- png_set_invert_alpha(png_ptr);
+ row_pointers = png_get_rows(png_ptr, info_ptr);
-This has to appear here rather than later with the other transformations
-because the tRNS chunk data must be modified in the case of paletted images.
-If your image is not a paletted image, the tRNS data (which in such cases
-represents a single color to be rendered as transparent) won't be changed.
+where row_pointers is an array of pointers to the pixel data for each row:
-Finally, you can write your own transformation function if none of
-the existing ones meets your needs. This is done by setting a callback
-with
+ png_bytep row_pointers[height];
- png_set_read_user_transform_fn(png_ptr,
- read_transform_fn);
+If you know your image size and pixel size ahead of time, you can allocate
+row_pointers prior to calling png_read_png() with
-You must supply the function
+ row_pointers = png_malloc(png_ptr,
+ height*sizeof(png_bytep));
+ for (int i=0; i<height, i++)
+ row_pointers[i]=png_malloc(png_ptr,
+ width*pixel_size);
+ png_set_rows(png_ptr, info_ptr, &row_pointers);
- void read_transform_fn(png_ptr ptr, row_info_ptr
- row_info, png_bytep data)
+Alternatively you could allocate your image in one big block and define
+row_pointers[i] to point into the proper places in your block.
-See pngtest.c for a working example. Your function will be called
-after all of the other transformations have been processed.
+If you use png_set_rows(), the application is responsible for freeing
+row_pointers (and row_pointers[i], if they were separately allocated).
+
+If you don't allocate row_pointers ahead of time, png_read_png() will
+do it, and it'll be free'ed when you call png_destroy_*().
-You are now ready to read all the file information up to the actual
-image data. You do this with a call to png_read_info().
+.SS The low-level read interface
+
+If you are going the low-level route, you are now ready to read all
+the file information up to the actual image data. You do this with a
+call to png_read_info().
png_read_info(png_ptr, info_ptr);
-Functions are used to get the information from the info_ptr:
+This will process all chunks up to but not including the image data.
+
+.SS Querying the info structure
+
+Functions are used to get the information from the info_ptr once it
+has been read. Note that these fields may not be completely filled
+in until png_read_end() has read the chunk data following the image.
png_get_IHDR(png_ptr, info_ptr, &width, &height,
&bit_depth, &color_type, &interlace_type,
- &compression_type, &filter_type);
+ &compression_type, &filter_method);
width - holds the width of the image
in pixels (up to 2^31).
PNG_COLOR_MASK_COLOR
PNG_COLOR_MASK_ALPHA
- filter_type - (must be PNG_FILTER_TYPE_BASE
- for PNG 1.0)
+ filter_method - (must be PNG_FILTER_TYPE_BASE
+ for PNG 1.0, and can also be
+ PNG_INTRAPIXEL_DIFFERENCING if
+ the PNG datastream is embedded in
+ a MNG-1.0 datastream)
compression_type - (must be PNG_COMPRESSION_TYPE_BASE
for PNG 1.0)
interlace_type - (PNG_INTERLACE_NONE or
PNG_INTERLACE_ADAM7)
Any or all of interlace_type, compression_type, of
- filter_type can be
- NULL if you are not interested in their values.
+ filter_method can be NULL if you are
+ not interested in their values.
channels = png_get_channels(png_ptr, info_ptr);
channels - number of channels of info for the
info_ptr);
color_type = png_get_color_type(png_ptr,
info_ptr);
- filter_type = png_get_filter_type(png_ptr,
+ filter_method = png_get_filter_type(png_ptr,
info_ptr);
compression_type = png_get_compression_type(png_ptr,
info_ptr);
implies specific values of gAMA and
cHRM.
+ png_get_iCCP(png_ptr, info_ptr, &name,
+ &compression_type, &profile, &proflen);
+ name - The profile name.
+ compression - The compression type; always
+ PNG_COMPRESSION_TYPE_BASE for PNG 1.0.
+ You may give NULL to this argument to
+ ignore it.
+ profile - International Color Consortium color
+ profile data. May contain NULs.
+ proflen - length of profile data in bytes.
+
png_get_sBIT(png_ptr, info_ptr, &sig_bit);
sig_bit - the number of significant bits for
(PNG_INFO_sBIT) each of the gray,
&trans_values);
trans - array of transparent entries for
palette (PNG_INFO_tRNS)
- trans_values - transparent pixel for non-paletted
- images (PNG_INFO_tRNS)
+ trans_values - graylevel or color sample values of
+ the single transparent color for
+ non-paletted images (PNG_INFO_tRNS)
num_trans - number of transparent entries
(PNG_INFO_tRNS)
png_get_hIST(png_ptr, info_ptr, &hist);
(PNG_INFO_hIST)
hist - histogram of palette (array of
- png_color_16)
+ png_uint_16)
png_get_tIME(png_ptr, info_ptr, &mod_time);
mod_time - time image was last modified
png_get_bKGD(png_ptr, info_ptr, &background);
background - background color (PNG_VALID_bKGD)
+ valid 16-bit red, green and blue
+ values, regardless of color_type
- num_text = png_get_text(png_ptr, info_ptr, &text_ptr);
+ num_comments = png_get_text(png_ptr, info_ptr,
+ &text_ptr, &num_text);
+ num_comments - number of comments
text_ptr - array of png_text holding image
comments
- text_ptr[i]->key - keyword for comment.
- text_ptr[i]->text - text comments for current
- keyword.
- text_ptr[i]->compression - type of compression used
- on "text" PNG_TEXT_COMPRESSION_NONE
- or PNG_TEXT_COMPRESSION_zTXt
- num_text - number of comments
+ text_ptr[i].compression - type of compression used
+ on "text" PNG_TEXT_COMPRESSION_NONE
+ PNG_TEXT_COMPRESSION_zTXt
+ PNG_ITXT_COMPRESSION_NONE
+ PNG_ITXT_COMPRESSION_zTXt
+ text_ptr[i].key - keyword for comment. Must contain
+ 1-79 characters.
+ text_ptr[i].text - text comments for current
+ keyword. Can be empty.
+ text_ptr[i].text_length - length of text string,
+ after decompression, 0 for iTXt
+ text_ptr[i].itxt_length - length of itxt string,
+ after decompression, 0 for tEXt/zTXt
+ text_ptr[i].lang - language of comment (empty
+ string for unknown).
+ text_ptr[i].lang_key - keyword in UTF-8
+ (empty string for unknown).
+ num_text - number of comments (same as
+ num_comments; you can put NULL here
+ to avoid the duplication)
+ Note while png_set_text() will accept text, language,
+ and translated keywords that can be NULL pointers, the
+ structure returned by png_get_text will always contain
+ regular zero-terminated C strings. They might be
+ empty strings but they will never be NULL pointers.
+
+ num_spalettes = png_get_sPLT(png_ptr, info_ptr,
+ &palette_ptr);
+ palette_ptr - array of palette structures holding
+ contents of one or more sPLT chunks
+ read.
+ num_spalettes - number of sPLT chunks read.
png_get_oFFs(png_ptr, info_ptr, &offset_x, &offset_y,
- &unit_type);
+ &unit_type);
offset_x - positive offset from the left edge
of the screen
offset_y - positive offset from the top edge
unit_type - PNG_OFFSET_PIXEL, PNG_OFFSET_MICROMETER
png_get_pHYs(png_ptr, info_ptr, &res_x, &res_y,
- &unit_type);
+ &unit_type);
res_x - pixels/unit physical resolution in
x direction
res_y - pixels/unit physical resolution in
unit_type - PNG_RESOLUTION_UNKNOWN,
PNG_RESOLUTION_METER
+ png_get_sCAL(png_ptr, info_ptr, &unit, &width,
+ &height)
+ unit - physical scale units (an integer)
+ width - width of a pixel in physical scale units
+ height - height of a pixel in physical scale units
+ (width and height are doubles)
+
+ png_get_sCAL_s(png_ptr, info_ptr, &unit, &width,
+ &height)
+ unit - physical scale units (an integer)
+ width - width of a pixel in physical scale units
+ height - height of a pixel in physical scale units
+ (width and height are strings like "2.54")
+
+ num_unknown_chunks = png_get_unknown_chunks(png_ptr,
+ info_ptr, &unknowns)
+ unknowns - array of png_unknown_chunk
+ structures holding unknown chunks
+ unknowns[i].name - name of unknown chunk
+ unknowns[i].data - data of unknown chunk
+ unknowns[i].size - size of unknown chunk's data
+ unknowns[i].location - position of chunk in file
+
+ The value of "i" corresponds to the order in which the
+ chunks were read from the PNG file or inserted with the
+ png_set_unknown_chunks() function.
+
The data from the pHYs chunk can be retrieved in several convenient
forms:
res_x = png_get_x_pixels_per_meter(png_ptr,
- info_ptr)
+ info_ptr)
res_y = png_get_y_pixels_per_meter(png_ptr,
- info_ptr)
+ info_ptr)
res_x_and_y = png_get_pixels_per_meter(png_ptr,
- info_ptr)
+ info_ptr)
+ res_x = png_get_x_pixels_per_inch(png_ptr,
+ info_ptr)
+ res_y = png_get_y_pixels_per_inch(png_ptr,
+ info_ptr)
+ res_x_and_y = png_get_pixels_per_inch(png_ptr,
+ info_ptr)
aspect_ratio = png_get_pixel_aspect_ratio(png_ptr,
- info_ptr)
+ info_ptr)
(Each of these returns 0 [signifying "unknown"] if
the data is not present or if res_x is 0;
res_x_and_y is 0 if res_x != res_y)
+The data from the oFFs chunk can be retrieved in several convenient
+forms:
+
+ x_offset = png_get_x_offset_microns(png_ptr, info_ptr);
+ y_offset = png_get_y_offset_microns(png_ptr, info_ptr);
+ x_offset = png_get_x_offset_inches(png_ptr, info_ptr);
+ y_offset = png_get_y_offset_inches(png_ptr, info_ptr);
+
+ (Each of these returns 0 [signifying "unknown" if both
+ x and y are 0] if the data is not present or if the
+ chunk is present but the unit is the pixel)
+
For more information, see the png_info definition in png.h and the
PNG specification for chunk contents. Be careful with trusting
rowbytes, as some of the transformations could increase the space
Keywords should be limited to 79 Latin-1 characters without leading or
trailing spaces, but non-consecutive spaces are allowed within the
keyword. It is possible to have the same keyword any number of times.
-The text_ptr is an array of png_text structures, each holding pointer
-to a keyword and a pointer to a text string. Only the text string may
-be null. The keyword/text pairs are put into the array in the order
-that they are received. However, some or all of the text chunks may be
-after the image, so, to make sure you have read all the text chunks,
-don't mess with these until after you read the stuff after the image.
-This will be mentioned again below in the discussion that goes with
-png_read_end().
+The text_ptr is an array of png_text structures, each holding a
+pointer to a language string, a pointer to a keyword and a pointer to
+a text string. The text string, language code, and translated
+keyword may be empty or NULL pointers. The keyword/text
+pairs are put into the array in the order that they are received.
+However, some or all of the text chunks may be after the image, so, to
+make sure you have read all the text chunks, don't mess with these
+until after you read the stuff after the image. This will be
+mentioned again below in the discussion that goes with png_read_end().
+
+.SS Input transformations
After you've read the header information, you can set up the library
to handle any special transformations of the image data. The various
grayscale images with bit depths of 2 or 4 or if there is a multiple-image
viewing application that wishes to treat all images in the same way.
- if (color_type == PNG_COLOR_TYPE_PALETTE &&
- bit_depth <= 8) png_set_expand(png_ptr);
+ if (color_type == PNG_COLOR_TYPE_PALETTE)
+ png_set_palette_to_rgb(png_ptr);
if (color_type == PNG_COLOR_TYPE_GRAY &&
- bit_depth < 8) png_set_expand(png_ptr);
+ bit_depth < 8) png_set_gray_1_2_4_to_8(png_ptr);
if (png_get_valid(png_ptr, info_ptr,
- PNG_INFO_tRNS)) png_set_expand(png_ptr);
+ PNG_INFO_tRNS)) png_set_tRNS_to_alpha(png_ptr);
+
+These three functions are actually aliases for png_set_expand(), added
+in libpng version 1.0.4, with the function names expanded to improve code
+readability. In some future version they may actually do different
+things.
PNG can have files with 16 bits per channel. If you only can handle
8 bits per channel, this will strip the pixels down to 8 bit.
if (bit_depth == 16)
png_set_strip_16(png_ptr);
-The png_set_background() function tells libpng to composite images
-with alpha or simple transparency against the supplied background
-color. If the PNG file contains a bKGD chunk (PNG_INFO_bKGD valid),
-you may use this color, or supply another color more suitable for
-the current display (e.g., the background color from a web page). You
-need to tell libpng whether the color is in the gamma space of the
-display (PNG_BACKGROUND_GAMMA_SCREEN for colors you supply), the file
-(PNG_BACKGROUND_GAMMA_FILE for colors from the bKGD chunk), or one
-that is neither of these gammas (PNG_BACKGROUND_GAMMA_UNIQUE - I don't
-know why anyone would use this, but it's here).
-
If, for some reason, you don't need the alpha channel on an image,
and you want to remove it rather than combining it with the background
(but the image author certainly had in mind that you *would* combine
if (color_type & PNG_COLOR_MASK_ALPHA)
png_set_strip_alpha(png_ptr);
+In PNG files, the alpha channel in an image
+is the level of opacity. If you need the alpha channel in an image to
+be the level of transparency instead of opacity, you can invert the
+alpha channel (or the tRNS chunk data) after it's read, so that 0 is
+fully opaque and 255 (in 8-bit or paletted images) or 65535 (in 16-bit
+images) is fully transparent, with
+
+ png_set_invert_alpha(png_ptr);
+
PNG files pack pixels of bit depths 1, 2, and 4 into bytes as small as
they can, resulting in, for example, 8 pixels per byte for 1 bit
files. This code expands to 1 pixel per byte without changing the
convert the PNG pixel data back to the original bit depth of the image.
This call reduces the pixels back down to the original bit depth:
- png_color_16p sig_bit;
+ png_color_8p sig_bit;
if (png_get_sBIT(png_ptr, info_ptr, &sig_bit))
png_set_shift(png_ptr, sig_bit);
color_type == PNG_COLOR_TYPE_RGB_ALPHA)
png_set_bgr(png_ptr);
-PNG files store RGB pixels packed into 3 bytes. This code expands them
-into 4 bytes for windowing systems that need them in this format:
+PNG files store RGB pixels packed into 3 or 6 bytes. This code expands them
+into 4 or 8 bytes for windowing systems that need them in this format:
- if (bit_depth == 8 && color_type ==
- PNG_COLOR_TYPE_RGB) png_set_filler(png_ptr,
- filler, PNG_FILLER_BEFORE);
+ if (color_type == PNG_COLOR_TYPE_RGB)
+ png_set_filler(png_ptr, filler, PNG_FILLER_BEFORE);
where "filler" is the 8 or 16-bit number to fill with, and the location is
either PNG_FILLER_BEFORE or PNG_FILLER_AFTER, depending upon whether
you want the filler before the RGB or after. This transformation
-does not affect images that already have full alpha channels.
+does not affect images that already have full alpha channels. To add an
+opaque alpha channel, use filler=0xff or 0xffff and PNG_FILLER_AFTER which
+will generate RGBA pixels.
If you are reading an image with an alpha channel, and you need the
data as ARGB instead of the normal PNG format RGBA:
png_set_gray_to_rgb(png_ptr);
Conversely, you can convert an RGB or RGBA image to grayscale or grayscale
-with alpha. This is intended for conversion of images that really are
-gray (red == green == blue), so the function simply strips out the red
-and blue channels, leaving the green channel in the gray position.
+with alpha.
if (color_type == PNG_COLOR_TYPE_RGB ||
color_type == PNG_COLOR_TYPE_RGB_ALPHA)
- png_set_rgb_to_gray(png_ptr, error_action,
- float red_weight, float green_weight);
+ png_set_rgb_to_gray_fixed(png_ptr, error_action,
+ int red_weight, int green_weight);
error_action = 1: silently do the conversion
error_action = 2: issue a warning if the original
image has any pixel where
red != green or red != blue
- red_weight: weight of red component
- (NULL -> default 54/256)
- green_weight: weight of green component
- (NULL -> default 183/256)
+ red_weight: weight of red component times 100000
+ green_weight: weight of green component times 100000
+ If either weight is negative, default
+ weights (21268, 71514) are used.
If you have set error_action = 1 or 2, you can
later check whether the image really was gray, after processing
will be silently converted to grayscale, using the green channel
data, regardless of the error_action setting.
-With 0.0<=red_weight+green_weight<=1.0,
+With red_weight+green_weight<=100000,
the normalized graylevel is computed:
- int rw = red_weight * 256;
- int gw = green_weight * 256;
- int bw = 256 - (rw + gw);
- gray = (rw*red + gw*green + bw*blue)/256;
+ int rw = red_weight * 65536;
+ int gw = green_weight * 65536;
+ int bw = 65536 - (rw + gw);
+ gray = (rw*red + gw*green + bw*blue)/65536;
The default values approximate those recommended in the Charles
Poynton's Color FAQ, <http://www.inforamp.net/~poynton/>
Libpng approximates this with
- Y = 0.211 * R + 0.715 * G + 0.074 * B
+ Y = 0.21268 * R + 0.7151 * G + 0.07217 * B
which can be expressed with integers as
- Y = (54 * R + 183 * G + 19 * B)/256
+ Y = (6969 * R + 23434 * G + 2365 * B)/32768
The calculation is done in a linear colorspace, if the image gamma
is known.
-If you have a grayscale and you are using png_set_expand() to change to
+If you have a grayscale and you are using png_set_expand_depth(),
+png_set_expand(), or png_set_gray_to_rgb to change to truecolor or to
a higher bit-depth, you must either supply the background color as a gray
value at the original file bit-depth (need_expand = 1) or else supply the
background color as an RGB triplet at the final, expanded bit depth
png_set_background(png_ptr, &my_background,
PNG_BACKGROUND_GAMMA_SCREEN, 0, 1.0);
+The png_set_background() function tells libpng to composite images
+with alpha or simple transparency against the supplied background
+color. If the PNG file contains a bKGD chunk (PNG_INFO_bKGD valid),
+you may use this color, or supply another color more suitable for
+the current display (e.g., the background color from a web page). You
+need to tell libpng whether the color is in the gamma space of the
+display (PNG_BACKGROUND_GAMMA_SCREEN for colors you supply), the file
+(PNG_BACKGROUND_GAMMA_FILE for colors from the bKGD chunk), or one
+that is neither of these gammas (PNG_BACKGROUND_GAMMA_UNIQUE - I don't
+know why anyone would use this, but it's here).
+
To properly display PNG images on any kind of system, the application needs
to know what the display gamma is. Ideally, the user will know this, and
the application will allow them to set it. One method of allowing the user
-to set the display gamma separately for each system is to check for the
-DISPLAY_GAMMA and VIEWING_GAMMA environment variables or for a SCREEN_GAMMA
-environment variable, which will hopefully be correctly set.
-
-Note that display_gamma is the gamma of your display, while screen_gamma is
-the overall gamma correction required to produce pleasing results,
-which depends on the lighting conditions in the surrounding environment.
-Screen_gamma is display_gamma/viewing_gamma, where viewing_gamma is
-the amount of additional gamma correction needed to compensate for
-a (viewing_gamma=1.25) environment. In a dim or brightly lit room, no
-compensation other than the display_gamma is needed (viewing_gamma=1.0).
+to set the display gamma separately for each system is to check for a
+SCREEN_GAMMA or DISPLAY_GAMMA environment variable, which will hopefully be
+correctly set.
+
+Note that display_gamma is the overall gamma correction required to produce
+pleasing results, which depends on the lighting conditions in the surrounding
+environment. In a dim or brightly lit room, no compensation other than
+the physical gamma exponent of the monitor is needed, while in a dark room
+a slightly smaller exponent is better.
+
+ double gamma, screen_gamma;
if (/* We have a user-defined screen
gamma value */)
else if ((gamma_str = getenv("SCREEN_GAMMA"))
!= NULL)
{
- screen_gamma = atof(gamma_str);
+ screen_gamma = (double)atof(gamma_str);
}
/* If we don't have another value */
else
if (png_get_valid(png_ptr, info_ptr,
PNG_INFO_PLTE))
{
- png_color_16p histogram;
+ png_uint_16p histogram;
png_get_hIST(png_ptr, info_ptr,
&histogram);
The following code will reverse this (make black be one and white be
zero):
- if (bit_depth == 1 && color_type == PNG_COLOR_GRAY)
+ if (bit_depth == 1 && color_type == PNG_COLOR_TYPE_GRAY)
+ png_set_invert_mono(png_ptr);
+
+This function can also be used to invert grayscale and gray-alpha images:
+
+ if (color_type == PNG_COLOR_TYPE_GRAY ||
+ color_type == PNG_COLOR_TYPE_GRAY_ALPHA)
png_set_invert_mono(png_ptr);
PNG files store 16 bit pixels in network byte order (big-endian,
if (bit_depth < 8)
png_set_packswap(png_ptr);
+Finally, you can write your own transformation function if none of
+the existing ones meets your needs. This is done by setting a callback
+with
+
+ png_set_read_user_transform_fn(png_ptr,
+ read_transform_fn);
+
+You must supply the function
+
+ void read_transform_fn(png_ptr ptr, row_info_ptr
+ row_info, png_bytep data)
+
+See pngtest.c for a working example. Your function will be called
+after all of the other transformations have been processed.
+
+You can also set up a pointer to a user structure for use by your
+callback function, and you can inform libpng that your transform
+function will change the number of channels or bit depth with the
+function
+
+ png_set_user_transform_info(png_ptr, user_ptr,
+ user_depth, user_channels);
+
+The user's application, not libpng, is responsible for allocating and
+freeing any memory required for the user structure.
+
+You can retrieve the pointer via the function
+png_get_user_transform_ptr(). For example:
+
+ voidp read_user_transform_ptr =
+ png_get_user_transform_ptr(png_ptr);
+
The last thing to handle is interlacing; this is covered in detail below,
but you must call the function here if you want libpng to handle expansion
of the interlaced image.
array of pointers to each row, as it will be needed for some
of the functions below.
+.SS Reading image data
+
After you've allocated memory, you can read the image data.
The simplest way to do this is in one function call. If you are
allocating enough memory to hold the whole image, you can just
where row_pointers is the same as in the png_read_image() call.
If you are doing this just one row at a time, you can do this with
-row_pointers:
+a single row_pointer instead of an array of row_pointers:
- png_bytep row_pointers = row;
- png_read_row(png_ptr, &row_pointers, NULL);
+ png_bytep row_pointer = row;
+ png_read_row(png_ptr, row_pointer, NULL);
-If the file is interlaced (info_ptr->interlace_type != 0), things get
-somewhat harder. The only current (PNG Specification version 1.0)
+If the file is interlaced (interlace_type != 0 in the IHDR chunk), things
+get somewhat harder. The only current (PNG Specification version 1.2)
interlacing type for PNG is (interlace_type == PNG_INTERLACE_ADAM7)
is a somewhat complicated 2D interlace scheme, known as Adam7, that
breaks down an image into seven smaller images of varying size, based
png_read_rows(png_ptr, NULL, row_pointers,
number_of_rows);
-After you are finished reading the image, you can finish reading
-the file. If you are interested in comments or time, which may be
-stored either before or after the image data, you should pass the
-separate png_info struct if you want to keep the comments from
-before and after the image separate. If you are not interested, you
-can pass NULL.
+.SS Finishing a sequential read
+
+After you are finished reading the image through either the high- or
+low-level interfaces, you can finish reading the file. If you are
+interested in comments or time, which may be stored either before or
+after the image data, you should pass the separate png_info struct if
+you want to keep the comments from before and after the image
+separate. If you are not interested, you can pass NULL.
png_read_end(png_ptr, end_info);
png_destroy_read_struct(&png_ptr, &info_ptr,
&end_info);
-For a more compact example of reading a PNG image, see the file example.c.
+It is also possible to individually free the info_ptr members that
+point to libpng-allocated storage with the following function:
+
+ png_free_data(png_ptr, info_ptr, mask, seq)
+ mask - identifies data to be freed, a mask
+ containing the logical OR of one or
+ more of
+ PNG_FREE_PLTE, PNG_FREE_TRNS,
+ PNG_FREE_HIST, PNG_FREE_ICCP,
+ PNG_FREE_PCAL, PNG_FREE_ROWS,
+ PNG_FREE_SCAL, PNG_FREE_SPLT,
+ PNG_FREE_TEXT, PNG_FREE_UNKN,
+ or simply PNG_FREE_ALL
+ seq - sequence number of item to be freed
+ (-1 for all items)
+
+This function may be safely called when the relevant storage has
+already been freed, or has not yet been allocated, or was allocated
+by the user and not by libpng, and will in those
+cases do nothing. The "seq" parameter is ignored if only one item
+of the selected data type, such as PLTE, is allowed. If "seq" is not
+-1, and multiple items are allowed for the data type identified in
+the mask, such as text or sPLT, only the n'th item in the structure
+is freed, where n is "seq".
+
+The default behavior is only to free data that was allocated internally
+by libpng. This can be changed, so that libpng will not free the data,
+or so that it will free data that was allocated by the user with png_malloc()
+or png_zalloc() and passed in via a png_set_*() function, with
+
+ png_data_freer(png_ptr, info_ptr, freer, mask)
+ mask - which data elements are affected
+ same choices as in png_free_data()
+ freer - one of
+ PNG_DESTROY_WILL_FREE_DATA
+ PNG_SET_WILL_FREE_DATA
+ PNG_USER_WILL_FREE_DATA
+
+This function only affects data that has already been allocated.
+You can call this function after reading the PNG data but before calling
+any png_set_*() functions, to control whether the user or the png_set_*()
+function is responsible for freeing any existing data that might be present,
+and again after the png_set_*() functions to control whether the user
+or png_destroy_*() is supposed to free the data. When the user assumes
+responsibility for libpng-allocated data, the application must use
+png_free() to free it, and when the user transfers responsibility to libpng
+for data that the user has allocated, the user must have used png_malloc()
+or png_zalloc() to allocate it.
+
+If you allocated your row_pointers in a single block, as suggested above in
+the description of the high level read interface, you must not transfer
+responsibility for freeing it to the png_set_rows or png_read_destroy function,
+because they would also try to free the individual row_pointers[i].
+
+If you allocated text_ptr.text, text_ptr.lang, and text_ptr.translated_keyword
+separately, do not transfer responsibility for freeing text_ptr to libpng,
+because when libpng fills a png_text structure it combines these members with
+the key member, and png_free_data() will free only text_ptr.key. Similarly,
+if you transfer responsibility for free'ing text_ptr from libpng to your
+application, your application must not separately free those members.
+
+The png_free_data() function will turn off the "valid" flag for anything
+it frees. If you need to turn the flag off for a chunk that was freed by your
+application instead of by libpng, you can use
+
+ png_set_invalid(png_ptr, info_ptr, mask);
+ mask - identifies the chunks to be made invalid,
+ containing the logical OR of one or
+ more of
+ PNG_INFO_gAMA, PNG_INFO_sBIT,
+ PNG_INFO_cHRM, PNG_INFO_PLTE,
+ PNG_INFO_tRNS, PNG_INFO_bKGD,
+ PNG_INFO_hIST, PNG_INFO_pHYs,
+ PNG_INFO_oFFs, PNG_INFO_tIME,
+ PNG_INFO_pCAL, PNG_INFO_sRGB,
+ PNG_INFO_iCCP, PNG_INFO_sPLT,
+ PNG_INFO_sCAL, PNG_INFO_IDAT
+For a more compact example of reading a PNG image, see the file example.c.
-Reading PNG files progressively:
+.SS Reading PNG files progressively
The progressive reader is slightly different then the non-progressive
reader. Instead of calling png_read_info(), png_read_rows(), and
(PNG_LIBPNG_VER_STRING, (png_voidp)user_error_ptr,
user_error_fn, user_warning_fn);
if (!png_ptr)
- return -1;
+ return (ERROR);
info_ptr = png_create_info_struct(png_ptr);
if (!info_ptr)
{
png_destroy_read_struct(&png_ptr, (png_infopp)NULL,
(png_infopp)NULL);
- return -1;
+ return (ERROR);
}
- if (setjmp(png_ptr->jmpbuf))
+ if (setjmp(png_jmpbuf(png_ptr)))
{
png_destroy_read_struct(&png_ptr, &info_ptr,
(png_infopp)NULL);
- return -1;
+ return (ERROR);
}
/* This one's new. You can provide functions
int
process_data(png_bytep buffer, png_uint_32 length)
{
- if (setjmp(png_ptr->jmpbuf))
+ if (setjmp(png_jmpbuf(png_ptr)))
{
png_destroy_read_struct(&png_ptr, &info_ptr,
(png_infopp)NULL);
- return -1;
+ return (ERROR);
}
/* This one's new also. Simply give it a chunk
importance is repeated here, so you won't have to constantly look
back up in the reading section to understand writing.
+.SS Setup
+
You will want to do the I/O initialization before you get into libpng,
so if it doesn't work, you don't have anything to undo. If you are not
using the standard I/O functions, you will need to replace them with
FILE *fp = fopen(file_name, "wb");
if (!fp)
{
- return;
+ return (ERROR);
}
Next, png_struct and png_info need to be allocated and initialized.
(PNG_LIBPNG_VER_STRING, (png_voidp)user_error_ptr,
user_error_fn, user_warning_fn);
if (!png_ptr)
- return;
+ return (ERROR);
png_infop info_ptr = png_create_info_struct(png_ptr);
if (!info_ptr)
{
png_destroy_write_struct(&png_ptr,
(png_infopp)NULL);
- return;
+ return (ERROR);
}
If you want to use your own memory allocation routines,
define PNG_USER_MEM_SUPPORTED and use
-png_create_write_struct_2() instead of png_create_read_struct():
+png_create_write_struct_2() instead of png_create_write_struct():
png_structp png_ptr = png_create_write_struct_2
(PNG_LIBPNG_VER_STRING, (png_voidp)user_error_ptr,
After you have these structures, you will need to set up the
error handling. When libpng encounters an error, it expects to
longjmp() back to your routine. Therefore, you will need to call
-setjmp() and pass the png_ptr->jmpbuf. If you
+setjmp() and pass the png_jmpbuf(png_ptr). If you
write the file from different routines, you will need to update
-the jmpbuf field every time you enter a new routine that will
-call a png_ function. See your documentation of setjmp/longjmp
+the png_jmpbuf(png_ptr) every time you enter a new routine that will
+call a png_*() function. See your documentation of setjmp/longjmp
for your compiler for more information on setjmp/longjmp. See
the discussion on libpng error handling in the Customizing Libpng
section below for more information on the libpng error handling.
- if (setjmp(png_ptr->jmpbuf))
+ if (setjmp(png_jmpbuf(png_ptr)))
{
- png_destroy_write_struct(&png_ptr, &info_ptr);
- fclose(fp);
- return;
+ png_destroy_write_struct(&png_ptr, &info_ptr);
+ fclose(fp);
+ return (ERROR);
}
...
return;
+If you would rather avoid the complexity of setjmp/longjmp issues,
+you can compile libpng with PNG_SETJMP_NOT_SUPPORTED, in which case
+errors will result in a call to PNG_ABORT() which defaults to abort().
+
Now you need to set up the output code. The default for libpng is to
use the C function fwrite(). If you use this, you will need to pass a
valid FILE * in the function png_init_io(). Be sure that the file is
png_init_io(png_ptr, fp);
+.SS Write callbacks
+
At this point, you can set up a callback function that will be
called after each row has been written, which you can use to control
a progress meter or the like. It's demonstrated in pngtest.c.
You must supply a function
- void write_row_callback(png_ptr, png_uint_32 row, int pass);
+ void write_row_callback(png_ptr, png_uint_32 row,
+ int pass);
{
/* put your code here */
}
have no special needs in this area, let the library do what it wants by
not calling this function at all, as it has been tuned to deliver a good
speed/compression ratio. The second parameter to png_set_filter() is
-the filter method, for which the only valid value is '0' (as of the
-October 1996 PNG specification, version 1.0). The third parameter is a
-flag that indicates which filter type(s) are to be tested for each
-scanline. See the Compression Library for details on the specific filter
+the filter method, for which the only valid values are 0 (as of the
+July 1999 PNG specification, version 1.2) or 64 (if you are writing
+a PNG datastream that is to be embedded in a MNG datastream). The third
+parameter is a flag that indicates which filter type(s) are to be tested
+for each scanline. See the PNG specification for details on the specific filter
types.
/* turn on or off filtering, and/or choose
- specific filters */
+ specific filters. You can use either a single
+ PNG_FILTER_VALUE_NAME or the logical OR of one
+ or more PNG_FILTER_NAME masks. */
png_set_filter(png_ptr, 0,
- PNG_FILTER_NONE | PNG_FILTER_SUB |
- PNG_FILTER_PAETH);
-
-The png_set_compression_???() functions interface to the zlib compression
+ PNG_FILTER_NONE | PNG_FILTER_VALUE_NONE |
+ PNG_FILTER_SUB | PNG_FILTER_VALUE_SUB |
+ PNG_FILTER_UP | PNG_FILTER_VALUE_UP |
+ PNG_FILTER_AVE | PNG_FILTER_VALUE_AVE |
+ PNG_FILTER_PAETH | PNG_FILTER_VALUE_PAETH|
+ PNG_ALL_FILTERS);
+
+If an application
+wants to start and stop using particular filters during compression,
+it should start out with all of the filters (to ensure that the previous
+row of pixels will be stored in case it's needed later), and then add
+and remove them after the start of compression.
+
+If you are writing a PNG datastream that is to be embedded in a MNG
+datastream, the second parameter can be either 0 or 64.
+
+The png_set_compression_*() functions interface to the zlib compression
library, and should mostly be ignored unless you really know what you are
doing. The only generally useful call is png_set_compression_level()
which changes how much time zlib spends on trying to compress the image
-data. See the Compression Library for details on the compression levels.
+data. See the Compression Library (zlib.h and algorithm.txt, distributed
+with zlib) for details on the compression levels.
/* set the zlib compression level */
png_set_compression_level(png_ptr,
Z_DEFAULT_STRATEGY);
png_set_compression_window_bits(png_ptr, 15);
png_set_compression_method(png_ptr, 8);
+ png_set_compression_buffer_size(png_ptr, 8192)
+
+extern PNG_EXPORT(void,png_set_zbuf_size)
+
+.SS Setting the contents of info for output
You now need to fill in the png_info structure with all the data you
wish to write before the actual image. Note that the only thing you
are allowed to write after the image is the text chunks and the time
-chunk (as of PNG Specification 1.0, anyway). See png_write_end() and
+chunk (as of PNG Specification 1.2, anyway). See png_write_end() and
the latest PNG specification for more information on that. If you
wish to write them before the image, fill them in now, and flag that
data as being valid. If you want to wait until after the data, don't
png_set_IHDR(png_ptr, info_ptr, width, height,
bit_depth, color_type, interlace_type,
- compression_type, filter_type)
+ compression_type, filter_method)
width - holds the width of the image
in pixels (up to 2^31).
height - holds the height of the image
PNG_INTERLACE_ADAM7
compression_type - (must be
PNG_COMPRESSION_TYPE_DEFAULT)
- filter_type - (must be PNG_FILTER_TYPE_DEFAULT)
+ filter_method - (must be PNG_FILTER_TYPE_DEFAULT
+ or, if you are writing a PNG to
+ be embedded in a MNG datastream,
+ can also be
+ PNG_INTRAPIXEL_DIFFERENCING)
png_set_PLTE(png_ptr, info_ptr, palette,
num_palette);
Color Consortium
(http://www.color.org).
It can be one of
- PNG_SRGB_INTENT_SATURATION,
- PNG_SRGB_INTENT_PERCEPTUAL,
- PNG_SRGB_INTENT_ABSOLUTE, or
- PNG_SRGB_INTENT_RELATIVE.
+ PNG_sRGB_INTENT_SATURATION,
+ PNG_sRGB_INTENT_PERCEPTUAL,
+ PNG_sRGB_INTENT_ABSOLUTE, or
+ PNG_sRGB_INTENT_RELATIVE.
png_set_sRGB_gAMA_and_cHRM(png_ptr, info_ptr,
that are consistent with sRGB to be
written.
+ png_set_iCCP(png_ptr, info_ptr, name, compression_type,
+ profile, proflen);
+ name - The profile name.
+ compression - The compression type; always
+ PNG_COMPRESSION_TYPE_BASE for PNG 1.0.
+ You may give NULL to this argument to
+ ignore it.
+ profile - International Color Consortium color
+ profile data. May contain NULs.
+ proflen - length of profile data in bytes.
+
png_set_sBIT(png_ptr, info_ptr, sig_bit);
sig_bit - the number of significant bits for
(PNG_INFO_sBIT) each of the gray, red,
trans_values);
trans - array of transparent entries for
palette (PNG_INFO_tRNS)
- trans_values - transparent pixel for non-paletted
- images (PNG_INFO_tRNS)
+ trans_values - graylevel or color sample values of
+ the single transparent color for
+ non-paletted images (PNG_INFO_tRNS)
num_trans - number of transparent entries
(PNG_INFO_tRNS)
png_set_hIST(png_ptr, info_ptr, hist);
(PNG_INFO_hIST)
hist - histogram of palette (array of
- png_color_16)
+ png_uint_16)
png_set_tIME(png_ptr, info_ptr, mod_time);
mod_time - time image was last modified
png_set_text(png_ptr, info_ptr, text_ptr, num_text);
text_ptr - array of png_text holding image
comments
- text_ptr[i]->key - keyword for comment.
- text_ptr[i]->text - text comments for current
- keyword.
- text_ptr[i]->compression - type of compression used
- on "text" PNG_TEXT_COMPRESSION_NONE or
- PNG_TEXT_COMPRESSION_zTXt
- num_text - number of comments in text_ptr
+ text_ptr[i].compression - type of compression used
+ on "text" PNG_TEXT_COMPRESSION_NONE
+ PNG_TEXT_COMPRESSION_zTXt
+ PNG_ITXT_COMPRESSION_NONE
+ PNG_ITXT_COMPRESSION_zTXt
+ text_ptr[i].key - keyword for comment. Must contain
+ 1-79 characters.
+ text_ptr[i].text - text comments for current
+ keyword. Can be NULL or empty.
+ text_ptr[i].text_length - length of text string,
+ after decompression, 0 for iTXt
+ text_ptr[i].itxt_length - length of itxt string,
+ after decompression, 0 for tEXt/zTXt
+ text_ptr[i].lang - language of comment (NULL or
+ empty for unknown).
+ text_ptr[i].translated_keyword - keyword in UTF-8 (NULL
+ or empty for unknown).
+ num_text - number of comments
+
+ png_set_sPLT(png_ptr, info_ptr, &palette_ptr,
+ num_spalettes);
+ palette_ptr - array of png_sPLT_struct structures
+ to be added to the list of palettes
+ in the info structure.
+ num_spalettes - number of palette structures to be
+ added.
png_set_oFFs(png_ptr, info_ptr, offset_x, offset_y,
unit_type);
unit_type - PNG_RESOLUTION_UNKNOWN,
PNG_RESOLUTION_METER
-In PNG files, the alpha channel in an image is the level of opacity.
-If your data is supplied as a level of transparency, you can invert the
-alpha channel before you write it, so that 0 is fully transparent and 255
-(in 8-bit or paletted images) or 65535 (in 16-bit images) is fully opaque,
-with
-
- png_set_invert_alpha(png_ptr);
-
-This must appear here instead of later with the other transformations
-because in the case of paletted images the tRNS chunk data has to
-be inverted before the tRNS chunk is written. If your image is not a
-paletted image, the tRNS data (which in such cases represents a single
-color to be rendered as transparent) won't be changed.
+ png_set_sCAL(png_ptr, info_ptr, unit, width, height)
+ unit - physical scale units (an integer)
+ width - width of a pixel in physical scale units
+ height - height of a pixel in physical scale units
+ (width and height are doubles)
+
+ png_set_sCAL_s(png_ptr, info_ptr, unit, width, height)
+ unit - physical scale units (an integer)
+ width - width of a pixel in physical scale units
+ height - height of a pixel in physical scale units
+ (width and height are strings like "2.54")
+
+ png_set_unknown_chunks(png_ptr, info_ptr, &unknowns,
+ num_unknowns)
+ unknowns - array of png_unknown_chunk
+ structures holding unknown chunks
+ unknowns[i].name - name of unknown chunk
+ unknowns[i].data - data of unknown chunk
+ unknowns[i].size - size of unknown chunk's data
+ unknowns[i].location - position to write chunk in file
+ 0: do not write chunk
+ PNG_HAVE_IHDR: before PLTE
+ PNG_HAVE_PLTE: before IDAT
+ PNG_AFTER_IDAT: after IDAT
+
+The "location" member is set automatically according to
+what part of the output file has already been written.
+You can change its value after calling png_set_unknown_chunks()
+as demonstrated in pngtest.c. Within each of the "locations",
+the chunks are sequenced according to their position in the
+structure (that is, the value of "i", which is the order in which
+the chunk was either read from the input file or defined with
+png_set_unknown_chunks).
A quick word about text and num_text. text is an array of png_text
structures. num_text is the number of valid structures in the array.
-If you want, you can use max_text to hold the size of the array, but
-libpng ignores it for writing (it does use it for reading). Each
-png_text structure holds a keyword-text value, and a compression type.
+Each png_text structure holds a language code, a keyword, a text value,
+and a compression type.
+
The compression types have the same valid numbers as the compression
types of the image data. Currently, the only valid number is zero.
However, you can store text either compressed or uncompressed, unlike
images, which always have to be compressed. So if you don't want the
text compressed, set the compression type to PNG_TEXT_COMPRESSION_NONE.
+Because tEXt and zTXt chunks don't have a language field, if you
+specify PNG_TEXT_COMPRESSION_NONE or PNG_TEXT_COMPRESSION_zTXt
+any language code or translated keyword will not be written out.
+
Until text gets around 1000 bytes, it is not worth compressing it.
After the text has been written out to the file, the compression type
is set to PNG_TEXT_COMPRESSION_NONE_WR or PNG_TEXT_COMPRESSION_zTXt_WR,
is compressed anyway, so the compression would be meaningless.
PNG supports modification time via the png_time structure. Two
-conversion routines are proved, png_convert_from_time_t() for
+conversion routines are provided, png_convert_from_time_t() for
time_t and png_convert_from_struct_tm() for struct tm. The
time_t routine uses gmtime(). You don't have to use either of
these, but if you wish to fill in the png_time structure directly,
png_convert_to_rfc1123(png_timep) is provided to convert from PNG
time to an RFC 1123 format string.
-You are now ready to write all the file information up to the actual
-image data. You do this with a call to png_write_info().
+.SS Writing unknown chunks
+
+You can use the png_set_unknown_chunks function to queue up chunks
+for writing. You give it a chunk name, raw data, and a size; that's
+all there is to it. The chunks will be written by the next following
+png_write_info_before_PLTE, png_write_info, or png_write_end function.
+Any chunks previously read into the info structure's unknown-chunk
+list will also be written out in a sequence that satisfies the PNG
+specification's ordering rules.
+
+.SS The high-level write interface
+
+At this point there are two ways to proceed; through the high-level
+write interface, or through a sequence of low-level write operations.
+You can use the high-level interface if your image data is present
+in the info structure. All defined output
+transformations are permitted, enabled by the following masks.
+
+ PNG_TRANSFORM_IDENTITY No transformation
+ PNG_TRANSFORM_PACKING Pack 1, 2 and 4-bit samples
+ PNG_TRANSFORM_PACKSWAP Change order of packed
+ pixels to LSB first
+ PNG_TRANSFORM_INVERT_MONO Invert monochrome images
+ PNG_TRANSFORM_SHIFT Normalize pixels to the
+ sBIT depth
+ PNG_TRANSFORM_BGR Flip RGB to BGR, RGBA
+ to BGRA
+ PNG_TRANSFORM_SWAP_ALPHA Flip RGBA to ARGB or GA
+ to AG
+ PNG_TRANSFORM_INVERT_ALPHA Change alpha from opacity
+ to transparency
+ PNG_TRANSFORM_SWAP_ENDIAN Byte-swap 16-bit samples
+ PNG_TRANSFORM_STRIP_FILLER Strip out filler bytes.
+
+If you have valid image data in the info structure (you can use
+png_set_rows() to put image data in the info structure), simply do this:
+
+ png_write_png(png_ptr, info_ptr, png_transforms, NULL)
+
+where png_transforms is an integer containing the logical OR of some set of
+transformation flags. This call is equivalent to png_write_info(),
+followed the set of transformations indicated by the transform mask,
+then png_write_image(), and finally png_write_end().
+
+(The final parameter of this call is not yet used. Someday it might point
+to transformation parameters required by some future output transform.)
+
+.SS The low-level write interface
+
+If you are going the low-level route instead, you are now ready to
+write all the file information up to the actual image data. You do
+this with a call to png_write_info().
png_write_info(png_ptr, info_ptr);
+Note that there is one transformation you may need to do before
+png_write_info(). In PNG files, the alpha channel in an image is the
+level of opacity. If your data is supplied as a level of
+transparency, you can invert the alpha channel before you write it, so
+that 0 is fully transparent and 255 (in 8-bit or paletted images) or
+65535 (in 16-bit images) is fully opaque, with
+
+ png_set_invert_alpha(png_ptr);
+
+This must appear before png_write_info() instead of later with the
+other transformations because in the case of paletted images the tRNS
+chunk data has to be inverted before the tRNS chunk is written. If
+your image is not a paletted image, the tRNS data (which in such cases
+represents a single color to be rendered as transparent) won't need to
+be changed, and you can safely do this transformation after your
+png_write_info() call.
+
+If you need to write a private chunk that you want to appear before
+the PLTE chunk when PLTE is present, you can write the PNG info in
+two steps, and insert code to write your own chunk between them:
+
+ png_write_info_before_PLTE(png_ptr, info_ptr);
+ png_set_unknown_chunks(png_ptr, info_ptr, ...);
+ png_write_info(png_ptr, info_ptr);
+
After you've written the file information, you can set up the library
to handle any special transformations of the image data. The various
ways to transform the data will be described in the order that they
data. For example, don't swap red and blue on grayscale data.
PNG files store RGB pixels packed into 3 or 6 bytes. This code tells
-the library to expand the input data to 4 or 8 bytes per pixel
-(or expand 1 or 2-byte grayscale data to 2 or 4 bytes per pixel).
+the library to strip input data that has 4 or 8 bytes per pixel down
+to 3 or 6 bytes (or strip 2 or 4-byte grayscale+filler data to 1 or 2
+bytes per pixel).
png_set_filler(png_ptr, 0, PNG_FILLER_BEFORE);
-where the 0 is the value that will be put in the 4th byte, and the
-location is either PNG_FILLER_BEFORE or PNG_FILLER_AFTER, depending
-upon whether the filler byte is stored XRGB or RGBX.
+where the 0 is unused, and the location is either PNG_FILLER_BEFORE or
+PNG_FILLER_AFTER, depending upon whether the filler byte in the pixel
+is stored XRGB or RGBX.
PNG files pack pixels of bit depths 1, 2, and 4 into bytes as small as
they can, resulting in, for example, 8 pixels per byte for 1 bit files.
PNG files reduce possible bit depths to 1, 2, 4, 8, and 16. If your
data is of another bit depth, you can write an sBIT chunk into the
-file so that decoders can get the original data if desired.
+file so that decoders can recover the original data if desired.
/* Set the true bit depth of the image data */
if (color_type & PNG_COLOR_MASK_COLOR)
row_info, png_bytep data)
See pngtest.c for a working example. Your function will be called
-before any of the other transformations have been processed.
+before any of the other transformations are processed.
+
+You can also set up a pointer to a user structure for use by your
+callback function.
+
+ png_set_user_transform_info(png_ptr, user_ptr, 0, 0);
+
+The user_channels and user_depth parameters of this function are ignored
+when writing; you can set them to zero as shown.
+
+You can retrieve the pointer via the function png_get_user_transform_ptr().
+For example:
+
+ voidp write_user_transform_ptr =
+ png_get_user_transform_ptr(png_ptr);
It is possible to have libpng flush any pending output, either manually,
or automatically after a certain number of lines have been written. To
only degrade the compression performance by a few percent over images
that do not use flushing.
+.SS Writing the image data
+
That's it for the transformations. Now you can write the image data.
-The simplest way to do this is in one function call. If have the
+The simplest way to do this is in one function call. If you have the
whole image in memory, you can just call png_write_image() and libpng
will write the image. You will need to pass in an array of pointers to
each row. This function automatically handles interlacing, so you don't
row_pointers is the same as in the png_write_image() call.
If you are just writing one row at a time, you can do this with
-row_pointers:
+a single row_pointer instead of an array of row_pointers:
png_bytep row_pointer = row;
- png_write_row(png_ptr, &row_pointer);
+ png_write_row(png_ptr, row_pointer);
When the file is interlaced, things can get a good deal more
-complicated. The only currently (as of February 1998 -- PNG Specification
-version 1.0, dated October 1996) defined interlacing scheme for PNG files
+complicated. The only currently (as of the PNG Specification
+version 1.2, dated July 1999) defined interlacing scheme for PNG files
is the "Adam7" interlace scheme, that breaks down an
image into seven smaller images of varying size. libpng will build
these images for you, or you can do them yourself. If you want to
you may want to read about interlacing in the PNG specification,
and only update the rows that are actually used.
+.SS Finishing a sequential write
+
After you are finished writing the image, you should finish writing
the file. If you are interested in writing comments or time, you should
pass an appropriately filled png_info pointer. If you are not interested,
png_destroy_write_struct(&png_ptr, &info_ptr);
-You must free any data you allocated for info_ptr, such as comments,
-palette, or histogram, before the call to png_destroy_write_struct();
-
+It is also possible to individually free the info_ptr members that
+point to libpng-allocated storage with the following function:
+
+ png_free_data(png_ptr, info_ptr, mask, seq)
+ mask - identifies data to be freed, a mask
+ containing the logical OR of one or
+ more of
+ PNG_FREE_PLTE, PNG_FREE_TRNS,
+ PNG_FREE_HIST, PNG_FREE_ICCP,
+ PNG_FREE_PCAL, PNG_FREE_ROWS,
+ PNG_FREE_SCAL, PNG_FREE_SPLT,
+ PNG_FREE_TEXT, PNG_FREE_UNKN,
+ or simply PNG_FREE_ALL
+ seq - sequence number of item to be freed
+ (-1 for all items)
+
+This function may be safely called when the relevant storage has
+already been freed, or has not yet been allocated, or was allocated
+by the user and not by libpng, and will in those
+cases do nothing. The "seq" parameter is ignored if only one item
+of the selected data type, such as PLTE, is allowed. If "seq" is not
+-1, and multiple items are allowed for the data type identified in
+the mask, such as text or sPLT, only the n'th item in the structure
+is freed, where n is "seq".
+
+If you allocated data such as a palette that you passed
+in to libpng with png_set_*, you must not free it until just before the call to
+png_destroy_write_struct().
+
+The default behavior is only to free data that was allocated internally
+by libpng. This can be changed, so that libpng will not free the data,
+or so that it will free data that was allocated by the user with png_malloc()
+or png_zalloc() and passed in via a png_set_*() function, with
+
+ png_data_freer(png_ptr, info_ptr, freer, mask)
+ mask - which data elements are affected
+ same choices as in png_free_data()
+ freer - one of
+ PNG_DESTROY_WILL_FREE_DATA
+ PNG_SET_WILL_FREE_DATA
+ PNG_USER_WILL_FREE_DATA
+
+For example, to transfer responsibility for some data from a read structure
+to a write structure, you could use
+
+ png_data_freer(read_ptr, read_info_ptr,
+ PNG_USER_WILL_FREE_DATA,
+ PNG_FREE_PLTE|PNG_FREE_tRNS|PNG_FREE_hIST)
+ png_data_freer(write_ptr, write_info_ptr,
+ PNG_DESTROY_WILL_FREE_DATA,
+ PNG_FREE_PLTE|PNG_FREE_tRNS|PNG_FREE_hIST)
+
+thereby briefly reassigning responsibility for freeing to the user but
+immediately afterwards reassigning it once more to the write_destroy
+function. Having done this, it would then be safe to destroy the read
+structure and continue to use the PLTE, tRNS, and hIST data in the write
+structure.
+
+This function only affects data that has already been allocated.
+You can call this function before calling after the png_set_*() functions
+to control whether the user or png_destroy_*() is supposed to free the data.
+When the user assumes responsibility for libpng-allocated data, the
+application must use
+png_free() to free it, and when the user transfers responsibility to libpng
+for data that the user has allocated, the user must have used png_malloc()
+or png_zalloc() to allocate it.
+
+If you allocated text_ptr.text, text_ptr.lang, and text_ptr.translated_keyword
+separately, do not transfer responsibility for freeing text_ptr to libpng,
+because when libpng fills a png_text structure it combines these members with
+the key member, and png_free_data() will free only text_ptr.key. Similarly,
+if you transfer responsibility for free'ing text_ptr from libpng to your
+application, your application must not separately free those members.
For a more compact example of writing a PNG image, see the file example.c.
-
.SH V. Modifying/Customizing libpng:
-There are two issues here. The first is changing how libpng does
+There are three issues here. The first is changing how libpng does
standard things like memory allocation, input/output, and error handling.
The second deals with more complicated things like adding new chunks,
adding new transformations, and generally changing how libpng works.
+Both of those are compile-time issues; that is, they are generally
+determined at the time the code is written, and there is rarely a need
+to provide the user with a means of changing them. The third is a
+run-time issue: choosing between and/or tuning one or more alternate
+versions of computationally intensive routines; specifically, optimized
+assembly-language (and therefore compiler- and platform-dependent)
+versions.
+
+Memory allocation, input/output, and error handling
All of the memory allocation, input/output, and error handling in libpng
-goes through callbacks that are user settable. The default routines are
-in pngmem.c, pngrio.c, pngwio.c, and pngerror.c respectively. To change
-these functions, call the appropriate png_set_???_fn() function.
-
-Memory allocation is done through the functions png_large_malloc(),
-png_malloc(), png_realloc(), png_large_free(), and png_free(). These
-currently just call the standard C functions. The large functions must
-handle exactly 64K, but they don't have to handle more than that. If
+goes through callbacks that are user-settable. The default routines are
+in pngmem.c, pngrio.c, pngwio.c, and pngerror.c, respectively. To change
+these functions, call the appropriate png_set_*_fn() function.
+
+Memory allocation is done through the functions png_malloc()
+and png_free(). These currently just call the standard C functions. If
your pointers can't access more then 64K at a time, you will want to set
MAXSEG_64K in zlib.h. Since it is unlikely that the method of handling
memory allocation on a platform will change between applications, these
-functions must be modified in the library at compile time.
+functions must be modified in the library at compile time. If you prefer
+to use a different method of allocating and freeing data, you can use
+png_create_read_struct_2() or png_create_write_struct_2() to register
+your own functions as described above.
+
+These functions also provide a void pointer that can be retrieved via
+
+ mem_ptr=png_get_mem_ptr(png_ptr);
+
+Your replacement memory functions must have prototypes as follows:
+
+ png_voidp malloc_fn(png_structp png_ptr,
+ png_size_t size);
+ void free_fn(png_structp png_ptr, png_voidp ptr);
+
+Your malloc_fn() should return NULL in case of failure. The png_malloc()
+function will call png_error() if it receives a NULL from the system
+memory allocator or from your replacement malloc_fn().
Input/Output in libpng is done through png_read() and png_write(),
which currently just call fread() and fwrite(). The FILE * is stored in
voidp read_io_ptr = png_get_io_ptr(read_ptr);
voidp write_io_ptr = png_get_io_ptr(write_ptr);
-The replacement I/O functions should have prototypes as follows:
+The replacement I/O functions must have prototypes as follows:
void user_read_data(png_structp png_ptr,
- png_bytep data, png_uint_32 length);
+ png_bytep data, png_size_t length);
void user_write_data(png_structp png_ptr,
- png_bytep data, png_uint_32 length);
+ png_bytep data, png_size_t length);
void user_flush_data(png_structp png_ptr);
Supplying NULL for the read, write, or flush functions sets them back
Error handling in libpng is done through png_error() and png_warning().
Errors handled through png_error() are fatal, meaning that png_error()
should never return to its caller. Currently, this is handled via
-setjmp() and longjmp(), but you could change this to do things like
-exit() if you should wish. On non-fatal errors, png_warning() is called
+setjmp() and longjmp() (unless you have compiled libpng with
+PNG_SETJMP_NOT_SUPPORTED, in which case it is handled via PNG_ABORT()),
+but you could change this to do things like exit() if you should wish.
+
+On non-fatal errors, png_warning() is called
to print a warning message, and then control returns to the calling code.
By default png_error() and png_warning() print a message on stderr via
-fprintf() unless the library is compiled with PNG_NO_STDIO defined. If
-you wish to change the behavior of the error functions, you will need to
-set up your own message callbacks. These functions are normally supplied
-at the time that the png_struct is created. It is also possible to change
-these functions after png_create_???_struct() has been called by calling:
+fprintf() unless the library is compiled with PNG_NO_CONSOLE_IO defined
+(because you don't want the messages) or PNG_NO_STDIO defined (because
+fprintf() isn't available). If you wish to change the behavior of the error
+functions, you will need to set up your own message callbacks. These
+functions are normally supplied at the time that the png_struct is created.
+It is also possible to redirect errors and warnings to your own replacement
+functions after png_create_*_struct() has been called by calling:
png_set_error_fn(png_structp png_ptr,
png_voidp error_ptr, png_error_ptr error_fn,
However, there are some uncertainties about the status of local variables
after a longjmp, so the user may want to be careful about doing anything after
setjmp returns non-zero besides returning itself. Consult your compiler
-documentation for more details.
-
-If you need to read or write custom chunks, you will need to get deeper
-into the libpng code, as a mechanism has not yet been supplied for user
-callbacks with custom chunks. First, read the PNG specification, and have
-a first level of understanding of how it works. Pay particular attention
-to the sections that describe chunk names, and look at how other chunks
-were designed, so you can do things similarly. Second, check out the
-sections of libpng that read and write chunks. Try to find a chunk that
-is similar to yours and copy off of it. More details can be found in the
-comments inside the code. A way of handling unknown chunks in a generic
-method, potentially via callback functions, would be best.
+documentation for more details. For an alternative approach, you may wish
+to use the "cexcept" facility (see http://cexcept.sourceforge.net).
+
+.SS Custom chunks
+
+If you need to read or write custom chunks, you may need to get deeper
+into the libpng code. The library now has mechanisms for storing
+and writing chunks of unknown type; you can even declare callbacks
+for custom chunks. Hoewver, this may not be good enough if the
+library code itself needs to know about interactions between your
+chunk and existing `intrinsic' chunks.
+
+If you need to write a new intrinsic chunk, first read the PNG
+specification. Acquire a first level of
+understanding of how it works. Pay particular attention to the
+sections that describe chunk names, and look at how other chunks were
+designed, so you can do things similarly. Second, check out the
+sections of libpng that read and write chunks. Try to find a chunk
+that is similar to yours and use it as a template. More details can
+be found in the comments inside the code. It is best to handle unknown
+chunks in a generic method, via callback functions, instead of by
+modifying libpng functions.
If you wish to write your own transformation for the data, look through
the part of the code that does the transformations, and check out some of
transformation to the one you want to add and copy off of it. More details
can be found in the comments inside the code itself.
-Configuring for 16 bit platforms:
+.SS Configuring for 16 bit platforms
-You may need to change the png_large_malloc() and png_large_free()
-routines in pngmem.c, as these are required to allocate 64K, although
-there is already support for many of the common DOS compilers. Also,
-you will want to look into zconf.h to tell zlib (and thus libpng) that
+You will want to look into zconf.h to tell zlib (and thus libpng) that
it cannot allocate more then 64K at a time. Even if you can, the memory
won't be accessible. So limit zlib and libpng to 64K by defining MAXSEG_64K.
-Configuring for DOS:
+.SS Configuring for DOS
For DOS users who only have access to the lower 640K, you will
have to limit zlib's memory usage via a png_set_compression_mem_level()
call. See zlib.h or zconf.h in the zlib library for more information.
-Configuring for Medium Model:
+.SS Configuring for Medium Model
Libpng's support for medium model has been tested on most of the popular
compilers. Make sure MAXSEG_64K gets defined, USE_FAR_KEYWORD gets
all set. Everything in the library (except for zlib's structure) is
expecting far data. You must use the typedefs with the p or pp on
the end for pointers (or at least look at them and be careful). Make
-note that the row's of data are defined as png_bytepp, which is an
+note that the rows of data are defined as png_bytepp, which is an
unsigned char far * far *.
-Configuring for gui/windowing platforms:
+.SS Configuring for gui/windowing platforms:
You will need to write new error and warning functions that use the GUI
interface, as described previously, and set them to be the error and
-warning functions at the time that png_create_???_struct() is called,
+warning functions at the time that png_create_*_struct() is called,
in order to have them available during the structure initialization.
They can be changed later via png_set_error_fn(). On some compilers,
you may also have to change the memory allocators (png_malloc, etc.).
-Configuring for compiler xxx:
+.SS Configuring for compiler xxx:
All includes for libpng are in pngconf.h. If you need to add/change/delete
an include, this is the place to do it. The includes that are not
which is only defined for those routines inside libpng itself. The
files in libpng proper only include png.h, which includes pngconf.h.
-Configuring zlib:
+.SS Configuring zlib:
There are special functions to configure the compression. Perhaps the
most useful one changes the compression level, which currently uses
Another useful one is to reduce the memory level used by the library.
The memory level defaults to 8, but it can be lowered if you are
short on memory (running DOS, for example, where you only have 640K).
+Note that the memory level does have an effect on compression; among
+other things, lower levels will result in sections of incompressible
+data being emitted in smaller stored blocks, with a correspondingly
+larger relative overhead of up to 15% in the worst case.
png_set_compression_mem_level(png_ptr, level);
png_set_compression_window_bits(png_ptr,
window_bits);
png_set_compression_method(png_ptr, method);
+ png_set_compression_buffer_size(png_ptr, size);
-Controlling row filtering:
+.SS Controlling row filtering
If you want to control whether libpng uses filtering or not, which
filters are used, and how it goes about picking row filters, you
for any images with bit depths less than 8 bits/pixel.
The 'method' parameter sets the main filtering method, which is
-currently only '0' in the PNG 1.0 specification. The 'filters'
+currently only '0' in the PNG 1.2 specification. The 'filters'
parameter sets which filter(s), if any, should be used for each
scanline. Possible values are PNG_ALL_FILTERS and PNG_NO_FILTERS
to turn filtering on and off, respectively.
Individual filter types are PNG_FILTER_NONE, PNG_FILTER_SUB,
PNG_FILTER_UP, PNG_FILTER_AVG, PNG_FILTER_PAETH, which can be bitwise
-ORed together '|' to specify one or more filters to use. These
-filters are described in more detail in the PNG specification. If
-you intend to change the filter type during the course of writing
+ORed together with '|' to specify one or more filters to use.
+These filters are described in more detail in the PNG specification.
+If you intend to change the filter type during the course of writing
the image, you should start with flags set for all of the filters
you intend to use so that libpng can initialize its internal
-structures appropriately for all of the filter types.
+structures appropriately for all of the filter types. (Note that this
+means the first row must always be adaptively filtered, because libpng
+currently does not allocate the filter buffers until png_write_row()
+is called for the first time.)
filters = PNG_FILTER_NONE | PNG_FILTER_SUB
- | PNG_FILTER_UP;
+ PNG_FILTER_UP | PNG_FILTER_AVE |
+ PNG_FILTER_PAETH | PNG_ALL_FILTERS;
+
png_set_filter(png_ptr, PNG_FILTER_TYPE_BASE,
filters);
+ The second parameter can also be
+ PNG_INTRAPIXEL_DIFFERENCING if you are
+ writing a PNG to be embedded in a MNG
+ datastream. This parameter must be the
+ same as the value of filter_method used
+ in png_set_IHDR().
It is also possible to influence how libpng chooses from among the
-available filters. This is done in two ways - by telling it how
-important it is to keep the same filter for successive rows, and
-by telling it the relative computational costs of the filters.
+available filters. This is done in one or both of two ways - by
+telling it how important it is to keep the same filter for successive
+rows, and by telling it the relative computational costs of the filters.
double weights[3] = {1.5, 1.3, 1.1},
costs[PNG_FILTER_VALUE_LAST] =
{1.0, 1.3, 1.3, 1.5, 1.7};
- png_set_filter_selection(png_ptr,
- PNG_FILTER_SELECTION_WEIGHTED, 3,
+ png_set_filter_heuristics(png_ptr,
+ PNG_FILTER_HEURISTIC_WEIGHTED, 3,
weights, costs);
The weights are multiplying factors that indicate to libpng that the
are given only to help explain the function usage. Little testing has
been done to find optimum values for either the costs or the weights.
-Removing unwanted object code:
+.SS Removing unwanted object code
There are a bunch of #define's in pngconf.h that control what parts of
libpng are compiled. All the defines end in _SUPPORTED. If you are
PNG_NO_.
You can also turn all of the transforms and ancillary chunk capabilities
-off en masse with compiler directives that define
+off en masse with compiler directives that define
PNG_NO_READ[or WRITE]_TRANSFORMS, or PNG_NO_READ[or WRITE]_ANCILLARY_CHUNKS,
or all four,
along with directives to turn on any of the capabilities that you do
want. The PNG_NO_READ[or WRITE]_TRANSFORMS directives disable
the extra transformations but still leave the library fully capable of reading
-and writing PNG files with all known public chunks [except for sPLT].
+and writing PNG files with all known public chunks
Use of the PNG_NO_READ[or WRITE]_ANCILLARY_CHUNKS directive
produces a library that is incapable of reading or writing ancillary chunks.
If you are not using the progressive reading capability, you can
The size of the library itself should not be an issue, because only
those sections that are actually used will be loaded into memory.
-Requesting debug printout:
+.SS Requesting debug printout
The macro definition PNG_DEBUG can be used to request debugging
printout. Set it to an integer value in the range 0 to 3. Higher
having level = 0 will be printed. There aren't any such statements in
this version of libpng, but if you insert some they will be printed.
-.SH VI. Changes to Libpng from version 0.88
+.SH VI. Runtime optimization
+
+A new feature in libpng 1.2.0 is the ability to dynamically switch between
+standard and optimized versions of some routines. Currently these are
+limited to three computationally intensive tasks when reading PNG files:
+decoding row filters, expanding interlacing, and combining interlaced or
+transparent row data with previous row data. Currently the optimized
+versions are available only for x86 (Intel, AMD, etc.) platforms with
+MMX support, though this may change in future versions. (For example,
+the non-MMX assembler optimizations for zlib might become similarly
+runtime-selectable in future releases, in which case libpng could be
+extended to support them. Alternatively, the compile-time choice of
+floating-point versus integer routines for gamma correction might become
+runtime-selectable.)
+
+Because such optimizations tend to be very platform- and compiler-dependent,
+both in how they are written and in how they perform, the new runtime code
+in libpng has been written to allow programs to query, enable, and disable
+either specific optimizations or all such optimizations. For example, to
+enable all possible optimizations (bearing in mind that some "optimizations"
+may actually run more slowly in rare cases):
+
+ #if defined(PNG_LIBPNG_VER) && (PNG_LIBPNG_VER >= 10200)
+ png_uint_32 mask, flags;
+
+ flags = png_get_asm_flags(png_ptr);
+ mask = png_get_asm_flagmask(PNG_SELECT_READ | PNG_SELECT_WRITE);
+ png_set_asm_flags(png_ptr, flags | mask);
+ #endif
+
+To enable only optimizations relevant to reading PNGs, use PNG_SELECT_READ
+by itself when calling png_get_asm_flagmask(); similarly for optimizing
+only writing. To disable all optimizations:
+
+ #if defined(PNG_LIBPNG_VER) && (PNG_LIBPNG_VER >= 10200)
+ flags = png_get_asm_flags(png_ptr);
+ mask = png_get_asm_flagmask(PNG_SELECT_READ | PNG_SELECT_WRITE);
+ png_set_asm_flags(png_ptr, flags & ~mask);
+ #endif
+
+To enable or disable only MMX-related features, use png_get_mmx_flagmask()
+in place of png_get_asm_flagmask(). The mmx version takes one additional
+parameter:
+
+ #if defined(PNG_LIBPNG_VER) && (PNG_LIBPNG_VER >= 10200)
+ int selection = PNG_SELECT_READ | PNG_SELECT_WRITE;
+ int compilerID;
+
+ mask = png_get_mmx_flagmask(selection, &compilerID);
+ #endif
+
+On return, compilerID will indicate which version of the MMX assembler
+optimizations was compiled. Currently two flavors exist: Microsoft
+Visual C++ (compilerID == 1) and GNU C (a.k.a. gcc/gas, compilerID == 2).
+On non-x86 platforms or on systems compiled without MMX optimizations, a
+value of -1 is used.
+
+Note that both png_get_asm_flagmask() and png_get_mmx_flagmask() return
+all valid, settable optimization bits for the version of the library that's
+currently in use. In the case of shared (dynamically linked) libraries,
+this may include optimizations that did not exist at the time the code was
+written and compiled. It is also possible, of course, to enable only known,
+specific optimizations; for example:
+
+ #if defined(PNG_LIBPNG_VER) && (PNG_LIBPNG_VER >= 10200)
+ flags = PNG_ASM_FLAG_MMX_READ_COMBINE_ROW \
+ | PNG_ASM_FLAG_MMX_READ_INTERLACE \
+ | PNG_ASM_FLAG_MMX_READ_FILTER_SUB \
+ | PNG_ASM_FLAG_MMX_READ_FILTER_UP \
+ | PNG_ASM_FLAG_MMX_READ_FILTER_AVG \
+ | PNG_ASM_FLAG_MMX_READ_FILTER_PAETH ;
+ png_set_asm_flags(png_ptr, flags);
+ #endif
+
+This method would enable only the MMX read-optimizations available at the
+time of libpng 1.2.0's release, regardless of whether a later version of
+the DLL were actually being used. (Also note that these functions did not
+exist in versions older than 1.2.0, so any attempt to run a dynamically
+linked app on such an older version would fail.)
+
+To determine whether the processor supports MMX instructions at all, use
+the png_mmx_support() function:
+
+ #if defined(PNG_LIBPNG_VER) && (PNG_LIBPNG_VER >= 10200)
+ mmxsupport = png_mmx_support();
+ #endif
+
+It returns -1 if MMX support is not compiled into libpng, 0 if MMX code
+is compiled but MMX is not supported by the processor, or 1 if MMX support
+is fully available. Note that png_mmx_support(), png_get_mmx_flagmask(),
+and png_get_asm_flagmask() all may be called without allocating and ini-
+tializing any PNG structures (for example, as part of a usage screen or
+"about" box).
+
+The following code can be used to prevent an application from using the
+thread_unsafe features, even if libpng was built with PNG_THREAD_UNSAFE_OK
+defined:
+
+#if defined(PNG_USE_PNGGCCRD) && defined(PNG_ASSEMBLER_CODE_SUPPORTED) \
+ && defined(PNG_THREAD_UNSAFE_OK)
+ /* Disable thread-unsafe features of pnggccrd */
+ if (png_access_version() >= 10200)
+ {
+ png_uint_32 mmx_disable_mask = 0;
+ png_uint_32 asm_flags;
+
+ mmx_disable_mask |= ( PNG_ASM_FLAG_MMX_READ_COMBINE_ROW \
+ | PNG_ASM_FLAG_MMX_READ_FILTER_SUB \
+ | PNG_ASM_FLAG_MMX_READ_FILTER_AVG \
+ | PNG_ASM_FLAG_MMX_READ_FILTER_PAETH );
+ asm_flags = png_get_asm_flags(png_ptr);
+ png_set_asm_flags(png_ptr, asm_flags & ~mmx_disable_mask);
+ }
+#endif
+
+For more extensive examples of runtime querying, enabling and disabling
+of optimized features, see contrib/gregbook/readpng2.c in the libpng
+source-code distribution.
+
+
+.SH VII. MNG support
+
+The MNG specification (available at http://www.libpng.org/pub/mng) allows
+certain extensions to PNG for PNG images that are embedded in MNG datastreams.
+Libpng can support some of these extensions. To enable them, use the
+png_permit_mng_features() function:
+
+ feature_set = png_permit_mng_features(png_ptr, mask)
+ mask is a png_uint_32 containing the logical OR of the
+ features you want to enable. These include
+ PNG_FLAG_MNG_EMPTY_PLTE
+ PNG_FLAG_MNG_FILTER_64
+ PNG_ALL_MNG_FEATURES
+ feature_set is a png_32_uint that is the logical AND of
+ your mask with the set of MNG features that is
+ supported by the version of libpng that you are using.
+
+It is an error to use this function when reading or writing a standalone
+PNG file with the PNG 8-byte signature. The PNG datastream must be wrapped
+in a MNG datastream. As a minimum, it must have the MNG 8-byte signature
+and the MHDR and MEND chunks. Libpng does not provide support for these
+or any other MNG chunks; your application must provide its own support for
+them. You may wish to consider using libmng (available at
+http://www.libmng.com) instead.
+
+.SH VIII. Changes to Libpng from version 0.88
It should be noted that versions of libpng later than 0.96 are not
distributed by the original libpng author, Guy Schalnat, nor by
still alive and well, but they have moved on to other things.
The old libpng functions png_read_init(), png_write_init(),
-png_info_init(), png_read_destroy(), and png_write_destory() have been
-moved to PNG_INTERNAL in version 0.95 to discourage their use. The
-preferred method of creating and initializing the libpng structures is
+png_info_init(), png_read_destroy(), and png_write_destroy() have been
+moved to PNG_INTERNAL in version 0.95 to discourage their use. These
+functions will be removed from libpng version 2.0.0.
+
+The preferred method of creating and initializing the libpng structures is
via the png_create_read_struct(), png_create_write_struct(), and
png_create_info_struct() because they isolate the size of the structures
from the application, allow version error checking, and also allow the
because this caused applications that do not use custom error functions
to fail if the png_ptr was not initialized to zero. It is still possible
to set the error callbacks AFTER png_read_init(), or to change them with
-png_set_error_fn(), which is essentially the same function, but with a
-new name to force compilation errors with applications that try to use
-the old method.
+png_set_error_fn(), which is essentially the same function, but with a new
+name to force compilation errors with applications that try to use the old
+method.
+
+Starting with version 1.0.7, you can find out which version of the library
+you are using at run-time:
+
+ png_uint_32 libpng_vn = png_access_version_number();
+
+The number libpng_vn is constructed from the major version, minor
+version with leading zero, and release number with leading zero,
+(e.g., libpng_vn for version 1.0.7 is 10007).
+
+You can also check which version of png.h you used when compiling your
+application:
+
+ png_uint_32 application_vn = PNG_LIBPNG_VER;
-.SH VII. Y2K Compliance in libpng
+.SH IX. Y2K Compliance in libpng
-January 13, 1999
+July 8, 2002
Since the PNG Development group is an ad-hoc body, we can't make
an official declaration.
-This is your unofficial assurance that libpng from version 0.81 and
-upward are Y2K compliant. It is my belief that earlier versions were
-also Y2K compliant.
+This is your unofficial assurance that libpng from version 0.71 and
+upward through 1.2.4 are Y2K compliant. It is my belief that earlier
+versions were also Y2K compliant.
Libpng only has three year fields. One is a 2-byte unsigned integer that
will hold years up to 65535. The other two hold the date in text
There are seven time-related functions:
- png_convert_to_rfc_1123() in png.c
+ png_convert_to_rfc_1123() in png.c
(formerly png_convert_to_rfc_1152() in error)
- png_convert_from_struct_tm() in pngwrite.c, called in pngwrite.c
+ png_convert_from_struct_tm() in pngwrite.c, called
+ in pngwrite.c
png_convert_from_time_t() in pngwrite.c
png_get_tIME() in pngget.c
png_handle_tIME() in pngrutil.c, called in pngread.c
png_set_tIME() in pngset.c
png_write_tIME() in pngwutil.c, called in pngwrite.c
-All appear to handle dates properly in a Y2K environment. The
+All appear to handle dates properly in a Y2K environment. The
png_convert_from_time_t() function calls gmtime() to convert from system
clock time, which returns (year - 1900), which we properly convert to
the full 4-digit year. There is a possibility that applications using
libpng are not passing 4-digit years into the png_convert_to_rfc_1123()
-function, or incorrectly passing only a 2-digit year instead of
-"year - 1900" into the png_convert_from_struct_tm() function, but this
-is not under our control. The libpng documentation has always stated
-that it works with 4-digit years, and the APIs have been documented as
-such.
+function, or that they are incorrectly passing only a 2-digit year
+instead of "year - 1900" into the png_convert_from_struct_tm() function,
+but this is not under our control. The libpng documentation has always
+stated that it works with 4-digit years, and the APIs have been
+documented as such.
The tIME chunk itself is also Y2K compliant. It uses a 2-byte unsigned
integer to hold the year, and can hold years as large as 65535.
+zlib, upon which libpng depends, is also Y2K compliant. It contains
+no date-related code.
+
Glenn Randers-Pehrson
libpng maintainer
The following table summarizes matters since version 0.89c, which was
the first widely used release:
- source png.h png.h shared-lib
- version string int version
- ------- ------ ------ ----------
- 0.89c 0.89 89 1.0.89
- 0.90 0.90 90 0.90 [should be 2.0.90]
- 0.95 0.95 95 0.95 [should be 2.0.95]
- 0.96 0.96 96 0.96 [should be 2.0.96]
- 0.97b 1.00.97 97 1.0.1 [should be 2.0.97]
- 0.97c 0.97 97 2.0.97
- 0.98 0.98 98 2.0.98
- 0.99 0.99 98 2.0.99
- 0.99a-m 0.99 99 2.0.99
- 1.00 1.00 100 2.1.0 [int should be 10000]
- 1.0.0 1.0.0 100 2.1.0 [int should be 10000]
- 1.0.1 1.0.1 10001 2.1.0
-
-Henceforth the source version will match the shared-library
-minor and patch numbers; the shared-library major version number will be
-used for changes in backward compatibility, as it is intended.
-The PNG_PNGLIB_VER macro, which is not used within libpng but
-is available for applications, is an unsigned integer of the form
-xyyzz corresponding to the source version x.y.z (leading zeros in y and z).
-
+ source png.h png.h shared-lib
+ version string int version
+ ------- ------ ----- ----------
+ 0.89c ("beta 3") 0.89 89 1.0.89
+ 0.90 ("beta 4") 0.90 90 0.90
+ 0.95 ("beta 5") 0.95 95 0.95
+ 0.96 ("beta 6") 0.96 96 0.96
+ 0.97b ("beta 7") 1.00.97 97 1.0.1
+ 0.97c 0.97 97 2.0.97
+ 0.98 0.98 98 2.0.98
+ 0.99 0.99 98 2.0.99
+ 0.99a-m 0.99 99 2.0.99
+ 1.00 1.00 100 2.1.0
+ 1.0.0 1.0.0 100 2.1.0
+ 1.0.0 (from here on, the 100 2.1.0
+ 1.0.1 png.h string is 10001 2.1.0
+ 1.0.1a-e identical to the 10002 from here on, the
+ 1.0.2 source version) 10002 shared library is 2.V
+ 1.0.2a-b 10003 where V is the source
+ 1.0.1 10001 code version except as
+ 1.0.1a-e 10002 2.1.0.1a-e noted.
+ 1.0.2 10002 2.1.0.2
+ 1.0.2a-b 10003 2.1.0.2a-b
+ 1.0.3 10003 2.1.0.3
+ 1.0.3a-d 10004 2.1.0.3a-d
+ 1.0.4 10004 2.1.0.4
+ 1.0.4a-f 10005 2.1.0.4a-f
+ 1.0.5 (+ 2 patches) 10005 2.1.0.5
+ 1.0.5a-d 10006 2.1.0.5a-d
+ 1.0.5e-r 10100 2.1.0.5e-r
+ 1.0.5s-v 10006 2.1.0.5s-v
+ 1.0.6 (+ 3 patches) 10006 2.1.0.6
+ 1.0.6d-g 10007 2.1.0.6d-g
+ 1.0.6h 10007 10.6h
+ 1.0.6i 10007 10.6i
+ 1.0.6j 10007 2.1.0.6j
+ 1.0.7beta11-14 DLLNUM 10007 2.1.0.7beta11-14
+ 1.0.7beta15-18 1 10007 2.1.0.7beta15-18
+ 1.0.7rc1-2 1 10007 2.1.0.7rc1-2
+ 1.0.7 1 10007 2.1.0.7
+ 1.0.8beta1-4 1 10008 2.1.0.8beta1-4
+ 1.0.8rc1 1 10008 2.1.0.8rc1
+ 1.0.8 1 10008 2.1.0.8
+ 1.0.9beta1-6 1 10009 2.1.0.9beta1-6
+ 1.0.9rc1 1 10009 2.1.0.9rc1
+ 1.0.9beta7-10 1 10009 2.1.0.9beta7-10
+ 1.0.9rc2 1 10009 2.1.0.9rc2
+ 1.0.9 1 10009 2.1.0.9
+ 1.0.10beta1 1 10010 2.1.0.10beta1
+ 1.0.10rc1 1 10010 2.1.0.10rc1
+ 1.0.10 1 10010 2.1.0.10
+ 1.0.11beta1-3 1 10011 2.1.0.11beta1-3
+ 1.0.11rc1 1 10011 2.1.0.11rc1
+ 1.0.11 1 10011 2.1.0.11
+ 1.0.12beta1-2 2 10012 2.1.0.12beta1-2
+ 1.0.12rc1 2 10012 2.1.0.12rc1
+ 1.0.12 2 10012 2.1.0.12
+ 1.1.0a-f - 10100 2.1.1.0a-f abandoned
+ 1.2.0beta1-2 2 10200 2.1.2.0beta1-2
+ 1.2.0beta3-5 3 10200 3.1.2.0beta3-5
+ 1.2.0rc1 3 10200 3.1.2.0rc1
+ 1.2.0 3 10200 3.1.2.0
+ 1.2.1beta-4 3 10201 3.1.2.1beta1-4
+ 1.2.1rc1-2 3 10201 3.1.2.1rc1-2
+ 1.2.1 3 10201 3.1.2.1
+ 1.2.2beta1-6 12 10202 12.so.0.1.2.2beta1-6
+ 1.0.13beta1 10 10013 10.so.0.1.0.13beta1
+ 1.0.13rc1 10 10013 10.so.0.1.0.13rc1
+ 1.2.2rc1 12 10202 12.so.0.1.2.2rc1
+ 1.0.13 10 10013 10.so.0.1.0.13
+ 1.2.2 12 10202 12.so.0.1.2.2
+ 1.2.3rc1-6 12 10203 12.so.0.1.2.3rc1-6
+ 1.2.3 12 10203 12.so.0.1.2.3
+ 1.2.4beta1-3 13 10204 12.so.0.1.2.4beta1-3
+ 1.2.4rc1 13 10204 12.so.0.1.2.4rc1
+ 1.0.14 10 10014 10.so.0.1.0.14
+ 1.2.4 13 10204 12.so.0.1.2.4
+
+Henceforth the source version will match the shared-library minor
+and patch numbers; the shared-library major version number will be
+used for changes in backward compatibility, as it is intended. The
+PNG_PNGLIB_VER macro, which is not used within libpng but is available
+for applications, is an unsigned integer of the form xyyzz corresponding
+to the source version x.y.z (leading zeros in y and z). Beta versions
+were given the previous public release number plus a letter, until
+version 1.0.6j; from then on they were given the upcoming public
+release number plus "betaNN" or "rcN".
+
.SH "SEE ALSO"
libpngpf(3), png(5)
.LP
.IR libpng :
.IP
ftp://ftp.uu.net/graphics/png
-http://www.cdrom.com/pub/png
+http://www.libpng.org/pub/png
.LP
.IR zlib :
.br
ftp://ftp.uu.net/pub/archiving/zip/zlib
.br
-http://www.cdrom.com/pub/infozip/zlib
+ftp://ftp.info-zip.org/pub/infozip/zlib
.LP
.IR PNG specification: RFC 2083
.SH AUTHORS
This man page: Glenn Randers-Pehrson
-<randeg@alumni.rpi.edu>
-
-Contributing Authors: John Bowler, Kevin Bracey, Sam Bushell, Andreas Dilger,
-Magnus Holmgren, Tom Lane, Dave Martindale, Glenn Randers-Pehrson,
-Greg Roelofs, Guy Eric Schalnat, Paul Schmidt, Tom Tanner, Willem van
-Schaik, Tim Wegner.
-<png-implement@dworkin.wustl.edu>
+<randeg@alum.rpi.edu>
The contributing authors would like to thank all those who helped
with testing, bug fixes, and patience. This wouldn't have been
possible without all of you.
Thanks to Frank J. T. Wojcik for helping with the documentation.
-
-Libpng version 1.0.3 - January 14, 1999:
+
+Libpng version 1.2.4 - July 8, 2002:
Initially created in 1995 by Guy Eric Schalnat, then of Group 42, Inc.
-Currently maintained by Glenn Randers-Pehrson (randeg@alumni.rpi.edu).
+Currently maintained by Glenn Randers-Pehrson (randeg@alum.rpi.edu).
Supported by the PNG development group
.br
-(png-implement@dworkin.wustl.edu).
+(png-implement@ccrc.wustl.edu).
-.SH COPYRIGHT NOTICE:
+.SH COPYRIGHT NOTICE, DISCLAIMER, and LICENSE:
-Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.
-Copyright (c) 1996, 1997 Andreas Dilger
+(This copy of the libpng notices is provided for your convenience. In case of
+any discrepancy between this copy and the notices in the file png.h that is
+included in the libpng distribution, the latter shall prevail.)
+
+If you modify libpng you may insert additional notices immediately following
+this sentence.
+
+libpng versions 1.0.7, July 1, 2000, through 1.2.4, July 8, 2002, are
+Copyright (c) 2000-2002 Glenn Randers-Pehrson, and are
+distributed according to the same disclaimer and license as libpng-1.0.6
+with the following individuals added to the list of Contributing Authors
+
+ Simon-Pierre Cadieux
+ Eric S. Raymond
+ Gilles Vollant
+
+and with the following additions to the disclaimer:
+
+ There is no warranty against interference with your
+ enjoyment of the library or against infringement.
+ There is no warranty that our efforts or the library
+ will fulfill any of your particular purposes or needs.
+ This library is provided with all faults, and the entire
+ risk of satisfactory quality, performance, accuracy, and
+ effort is with the user.
+
+libpng versions 0.97, January 1998, through 1.0.6, March 20, 2000, are
Copyright (c) 1998, 1999 Glenn Randers-Pehrson
+Distributed according to the same disclaimer and license as libpng-0.96,
+with the following individuals added to the list of Contributing Authors:
+
+ Tom Lane
+ Glenn Randers-Pehrson
+ Willem van Schaik
-The PNG Reference Library (libpng) is supplied "AS IS". The Contributing
-Authors and Group 42, Inc. disclaim all warranties, expressed or implied,
+libpng versions 0.89, June 1996, through 0.96, May 1997, are
+Copyright (c) 1996, 1997 Andreas Dilger
+Distributed according to the same disclaimer and license as libpng-0.88,
+with the following individuals added to the list of Contributing Authors:
+
+ John Bowler
+ Kevin Bracey
+ Sam Bushell
+ Magnus Holmgren
+ Greg Roelofs
+ Tom Tanner
+
+libpng versions 0.5, May 1995, through 0.88, January 1996, are
+Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.
+
+For the purposes of this copyright and license, "Contributing Authors"
+is defined as the following set of individuals:
+
+ Andreas Dilger
+ Dave Martindale
+ Guy Eric Schalnat
+ Paul Schmidt
+ Tim Wegner
+
+The PNG Reference Library is supplied "AS IS". The Contributing Authors
+and Group 42, Inc. disclaim all warranties, expressed or implied,
including, without limitation, the warranties of merchantability and of
fitness for any purpose. The Contributing Authors and Group 42, Inc.
assume no liability for direct, indirect, incidental, special, exemplary,
source code, or portions hereof, for any purpose, without fee, subject
to the following restrictions:
- 1. The origin of this source code must not be
- misrepresented.
+1. The origin of this source code must not be misrepresented.
- 2. Altered versions must be plainly marked as such
- and must not be misrepresented as being the
- original source.
+2. Altered versions must be plainly marked as such and
+ must not be misrepresented as being the original source.
- 3. This Copyright notice may not be removed or
- altered from any source or altered source
- distribution.
+3. This Copyright notice may not be removed or altered from
+ any source or altered source distribution.
The Contributing Authors and Group 42, Inc. specifically permit, without
fee, and encourage the use of this source code as a component to
source code in a product, acknowledgment is not required but would be
appreciated.
+
+A "png_get_copyright" function is available, for convenient use in "about"
+boxes and the like:
+
+ printf("%s",png_get_copyright(NULL));
+
+Also, the PNG logo (in PNG format, of course) is supplied in the
+files "pngbar.png" and "pngbar.jpg (88x31) and "pngnow.png" (98x31).
+
+Libpng is OSI Certified Open Source Software. OSI Certified Open Source is a
+certification mark of the Open Source Initiative.
+
+Glenn Randers-Pehrson
+randeg@alum.rpi.edu
+July 8, 2002
+
.\" end of man page
libpng.txt - A description on how to use and modify libpng
- libpng version 1.0.3 - January 14, 1999
+ libpng version 1.2.4 - July 8, 2002
Updated and distributed by Glenn Randers-Pehrson
- <randeg@alumni.rpi.edu>
- Copyright (c) 1998, 1999 Glenn Randers-Pehrson
+ <randeg@alum.rpi.edu>
+ Copyright (c) 1998-2002 Glenn Randers-Pehrson
For conditions of distribution and use, see copyright
notice in png.h.
Schalnat, Group 42, Inc.
Updated/rewritten per request in the libpng FAQ
- Copyright (c) 1995 Frank J. T. Wojcik
- December 18, 1995 && January 20, 1996
+ Copyright (c) 1995, 1996 Frank J. T. Wojcik
+ December 18, 1995 & January 20, 1996
I. Introduction
Libpng was written as a companion to the PNG specification, as a way
of reducing the amount of time and effort it takes to support the PNG
-file format in application programs. The PNG specification is available
+file format in application programs.
+
+The PNG-1.2 specification is available at <http://www.libpng.org/pub/png>
+and at <ftp://ftp.uu.net/graphics/png/documents/>.
+
+The PNG-1.0 specification is available
as RFC 2083 <ftp://ftp.uu.net/graphics/png/documents/> and as a
W3C Recommendation <http://www.w3.org/TR/REC.png.html>. Some
additional chunks are described in the special-purpose public chunks
-documents at <ftp://ftp.uu.net/graphics/png/documents/>. Other information
+documents at <ftp://ftp.uu.net/graphics/png/documents/>.
+
+Other information
about PNG, and the latest version of libpng, can be found at the PNG home
-page, <http://www.cdrom.com/pub/png/>.
+page, <http://www.libpng.org/pub/png/>
+and at <ftp://ftp.uu.net/graphics/png/>.
Most users will not have to modify the library significantly; advanced
users may want to modify it more. All attempts were made to make it as
Libpng uses zlib for its compression and decompression of PNG files.
Further information about zlib, and the latest version of zlib, can
-be found at the zlib home page, <http://www.cdrom.com/pub/infozip/zlib/>.
+be found at the zlib home page, <http://www.info-zip.org/pub/infozip/zlib/>.
The zlib compression utility is a general purpose utility that is
useful for more than PNG files, and can be used without libpng.
See the documentation delivered with zlib for more details.
instances of the structures. Each thread should have its own
png_struct and png_info instances, and thus its own image.
Libpng does not protect itself against two threads using the
-same instance of a structure.
+same instance of a structure. Note: thread safety may be defeated
+by use of some of the MMX assembler code in pnggccrd.c, which is only
+compiled when the user defines PNG_THREAD_UNSAFE_OK.
II. Structures
PNG file. At one time, the fields of png_info were intended to be
directly accessible to the user. However, this tended to cause problems
with applications using dynamically loaded libraries, and as a result
-a set of interface functions for png_info was developed. The fields
-of png_info are still available for older applications, but it is
-suggested that applications use the new interfaces if at all possible.
+a set of interface functions for png_info (the png_get_*() and png_set_*()
+functions) was developed. The fields of png_info are still available for
+older applications, but it is suggested that applications use the new
+interfaces if at all possible.
+
+Applications that do make direct access to the members of png_struct (except
+for png_ptr->jmpbuf) must be recompiled whenever the library is updated,
+and applications that make direct access to the members of png_info must
+be recompiled if they were compiled or loaded with libpng version 1.0.6,
+in which the members were in a different order. In version 1.0.7, the
+members of the png_info structure reverted to the old order, as they were
+in versions 0.97c through 1.0.5. Starting with version 2.0.0, both
+structures are going to be hidden, and the contents of the structures will
+only be accessible through the png_get/png_set functions.
The png.h header file is an invaluable reference for programming with libpng.
And while I'm on the topic, make sure you include the libpng header file:
III. Reading
-Reading PNG files:
-
We'll now walk you through the possible functions to call when reading
-in a PNG file, briefly explaining the syntax and purpose of each one.
-See example.c and png.h for more detail. While Progressive reading
-is covered in the next section, you will still need some of the
-functions discussed in this section to read a PNG file.
+in a PNG file sequentially, briefly explaining the syntax and purpose
+of each one. See example.c and png.h for more detail. While
+progressive reading is covered in the next section, you will still
+need some of the functions discussed in this section to read a PNG
+file.
+
+Setup
You will want to do the I/O initialization(*) before you get into libpng,
so if it doesn't work, you don't have much to undo. Of course, you
will also want to insure that you are, in fact, dealing with a PNG
file. Libpng provides a simple check to see if a file is a PNG file.
-To use it, pass in the first 1 to 8 bytes of the file, and it will
-return true or false (1 or 0) depending on whether the bytes could be
-part of a PNG file. Of course, the more bytes you pass in, the
-greater the accuracy of the prediction.
+To use it, pass in the first 1 to 8 bytes of the file to the function
+png_sig_cmp(), and it will return 0 if the bytes match the corresponding
+bytes of the PNG signature, or nonzero otherwise. Of course, the more bytes
+you pass in, the greater the accuracy of the prediction.
If you are intending to keep the file pointer open for use in libpng,
you must ensure you don't read more than 8 bytes from the beginning
FILE *fp = fopen(file_name, "rb");
if (!fp)
{
- return;
+ return (ERROR);
}
fread(header, 1, number, fp);
is_png = !png_sig_cmp(header, 0, number);
if (!is_png)
{
- return;
+ return (NOT_PNG);
}
use by the error functions, if necessary (the pointer and functions can
be NULL if the default error handlers are to be used). See the section
on Changes to Libpng below regarding the old initialization functions.
+The structure allocation functions quietly return NULL if they fail to
+create the structure, so your application should check for that.
png_structp png_ptr = png_create_read_struct
(PNG_LIBPNG_VER_STRING, (png_voidp)user_error_ptr,
user_error_fn, user_warning_fn);
if (!png_ptr)
- return;
+ return (ERROR);
png_infop info_ptr = png_create_info_struct(png_ptr);
if (!info_ptr)
{
png_destroy_read_struct(&png_ptr,
(png_infopp)NULL, (png_infopp)NULL);
- return;
+ return (ERROR);
}
png_infop end_info = png_create_info_struct(png_ptr);
{
png_destroy_read_struct(&png_ptr, &info_ptr,
(png_infopp)NULL);
- return;
+ return (ERROR);
}
If you want to use your own memory allocation routines,
When libpng encounters an error, it expects to longjmp back
to your routine. Therefore, you will need to call setjmp and pass
-your png_ptr->jmpbuf. If you read the file from different
+your png_jmpbuf(png_ptr). If you read the file from different
routines, you will need to update the jmpbuf field every time you enter
-a new routine that will call a png_ function.
+a new routine that will call a png_*() function.
See your documentation of setjmp/longjmp for your compiler for more
-handling in the Customizing Libpng section below for more information on
-the libpng error handling. If an error occurs, and libpng longjmp's
+information on setjmp/longjmp. See the discussion on libpng error
+handling in the Customizing Libpng section below for more information
+on the libpng error handling. If an error occurs, and libpng longjmp's
back to your setjmp, you will want to call png_destroy_read_struct() to
free any memory.
- if (setjmp(png_ptr->jmpbuf))
+ if (setjmp(png_jmpbuf(png_ptr)))
{
png_destroy_read_struct(&png_ptr, &info_ptr,
&end_info);
fclose(fp);
- return;
+ return (ERROR);
}
+If you would rather avoid the complexity of setjmp/longjmp issues,
+you can compile libpng with PNG_SETJMP_NOT_SUPPORTED, in which case
+errors will result in a call to PNG_ABORT() which defaults to abort().
+
Now you need to set up the input code. The default for libpng is to
use the C function fread(). If you use this, you will need to pass a
valid FILE * in the function png_init_io(). Be sure that the file is
png_set_sig_bytes(png_ptr, number);
+Setting up callback code
+
+You can set up a callback function to handle any unknown chunks in the
+input stream. You must supply the function
+
+ read_chunk_callback(png_ptr ptr,
+ png_unknown_chunkp chunk);
+ {
+ /* The unknown chunk structure contains your
+ chunk data: */
+ png_byte name[5];
+ png_byte *data;
+ png_size_t size;
+ /* Note that libpng has already taken care of
+ the CRC handling */
+
+ /* put your code here. Return one of the
+ following: */
+
+ return (-n); /* chunk had an error */
+ return (0); /* did not recognize */
+ return (n); /* success */
+ }
+
+(You can give your function another name that you like instead of
+"read_chunk_callback")
+
+To inform libpng about your function, use
+
+ png_set_read_user_chunk_fn(png_ptr, user_chunk_ptr,
+ read_chunk_callback);
+
+This names not only the callback function, but also a user pointer that
+you can retrieve with
+
+ png_get_user_chunk_ptr(png_ptr);
+
At this point, you can set up a callback function that will be
called after each row has been read, which you can use to control
a progress meter or the like. It's demonstrated in pngtest.c.
You must supply a function
- void read_row_callback(png_ptr, png_uint_32 row, int pass);
+ void read_row_callback(png_ptr ptr, png_uint_32 row,
+ int pass);
{
/* put your code here */
}
png_set_read_status_fn(png_ptr, read_row_callback);
-In PNG files, the alpha channel in an image is the level of opacity.
-If you need the alpha channel in an image to be the level of transparency
-instead of opacity, you can invert the alpha channel (or the tRNS chunk
-data) after it's read, so that 0 is fully opaque and 255 (in 8-bit or
-paletted images) or 65535 (in 16-bit images) is fully transparent, with
+Unknown-chunk handling
+
+Now you get to set the way the library processes unknown chunks in the
+input PNG stream. Both known and unknown chunks will be read. Normal
+behavior is that known chunks will be parsed into information in
+various info_ptr members; unknown chunks will be discarded. To change
+this, you can call:
+
+ png_set_keep_unknown_chunks(png_ptr, info_ptr, keep,
+ chunk_list, num_chunks);
+ keep - 0: do not keep
+ 1: keep only if safe-to-copy
+ 2: keep even if unsafe-to-copy
+ chunk_list - list of chunks affected (a byte string,
+ five bytes per chunk, NULL or '\0' if
+ num_chunks is 0)
+ num_chunks - number of chunks affected; if 0, all
+ unknown chunks are affected
+
+Unknown chunks declared in this way will be saved as raw data onto a
+list of png_unknown_chunk structures. If a chunk that is normally
+known to libpng is named in the list, it will be handled as unknown,
+according to the "keep" directive. If a chunk is named in successive
+instances of png_set_keep_unknown_chunks(), the final instance will
+take precedence.
+
+The high-level read interface
+
+At this point there are two ways to proceed; through the high-level
+read interface, or through a sequence of low-level read operations.
+You can use the high-level interface if (a) you are willing to read
+the entire image into memory, and (b) the input transformations
+you want to do are limited to the following set:
+
+ PNG_TRANSFORM_IDENTITY No transformation
+ PNG_TRANSFORM_STRIP_16 Strip 16-bit samples to
+ 8 bits
+ PNG_TRANSFORM_STRIP_ALPHA Discard the alpha channel
+ PNG_TRANSFORM_PACKING Expand 1, 2 and 4-bit
+ samples to bytes
+ PNG_TRANSFORM_PACKSWAP Change order of packed
+ pixels to LSB first
+ PNG_TRANSFORM_EXPAND Perform set_expand()
+ PNG_TRANSFORM_INVERT_MONO Invert monochrome images
+ PNG_TRANSFORM_SHIFT Normalize pixels to the
+ sBIT depth
+ PNG_TRANSFORM_BGR Flip RGB to BGR, RGBA
+ to BGRA
+ PNG_TRANSFORM_SWAP_ALPHA Flip RGBA to ARGB or GA
+ to AG
+ PNG_TRANSFORM_INVERT_ALPHA Change alpha from opacity
+ to transparency
+ PNG_TRANSFORM_SWAP_ENDIAN Byte-swap 16-bit samples
+
+(This excludes setting a background color, doing gamma transformation,
+dithering, and setting filler.) If this is the case, simply do this:
+
+ png_read_png(png_ptr, info_ptr, png_transforms, NULL)
+
+where png_transforms is an integer containing the logical OR of
+some set of transformation flags. This call is equivalent to png_read_info(),
+followed the set of transformations indicated by the transform mask,
+then png_read_image(), and finally png_read_end().
+
+(The final parameter of this call is not yet used. Someday it might point
+to transformation parameters required by some future input transform.)
+
+After you have called png_read_png(), you can retrieve the image data
+with
- png_set_invert_alpha(png_ptr);
+ row_pointers = png_get_rows(png_ptr, info_ptr);
-This has to appear here rather than later with the other transformations
-because the tRNS chunk data must be modified in the case of paletted images.
-If your image is not a paletted image, the tRNS data (which in such cases
-represents a single color to be rendered as transparent) won't be changed.
+where row_pointers is an array of pointers to the pixel data for each row:
-Finally, you can write your own transformation function if none of
-the existing ones meets your needs. This is done by setting a callback
-with
+ png_bytep row_pointers[height];
- png_set_read_user_transform_fn(png_ptr,
- read_transform_fn);
+If you know your image size and pixel size ahead of time, you can allocate
+row_pointers prior to calling png_read_png() with
-You must supply the function
+ row_pointers = png_malloc(png_ptr,
+ height*sizeof(png_bytep));
+ for (int i=0; i<height, i++)
+ row_pointers[i]=png_malloc(png_ptr,
+ width*pixel_size);
+ png_set_rows(png_ptr, info_ptr, &row_pointers);
- void read_transform_fn(png_ptr ptr, row_info_ptr
- row_info, png_bytep data)
+Alternatively you could allocate your image in one big block and define
+row_pointers[i] to point into the proper places in your block.
-See pngtest.c for a working example. Your function will be called
-after all of the other transformations have been processed.
+If you use png_set_rows(), the application is responsible for freeing
+row_pointers (and row_pointers[i], if they were separately allocated).
-You are now ready to read all the file information up to the actual
-image data. You do this with a call to png_read_info().
+If you don't allocate row_pointers ahead of time, png_read_png() will
+do it, and it'll be free'ed when you call png_destroy_*().
+
+The low-level read interface
+
+If you are going the low-level route, you are now ready to read all
+the file information up to the actual image data. You do this with a
+call to png_read_info().
png_read_info(png_ptr, info_ptr);
-Functions are used to get the information from the info_ptr:
+This will process all chunks up to but not including the image data.
+
+Querying the info structure
+
+Functions are used to get the information from the info_ptr once it
+has been read. Note that these fields may not be completely filled
+in until png_read_end() has read the chunk data following the image.
png_get_IHDR(png_ptr, info_ptr, &width, &height,
&bit_depth, &color_type, &interlace_type,
- &compression_type, &filter_type);
+ &compression_type, &filter_method);
width - holds the width of the image
in pixels (up to 2^31).
PNG_COLOR_MASK_COLOR
PNG_COLOR_MASK_ALPHA
- filter_type - (must be PNG_FILTER_TYPE_BASE
- for PNG 1.0)
+ filter_method - (must be PNG_FILTER_TYPE_BASE
+ for PNG 1.0, and can also be
+ PNG_INTRAPIXEL_DIFFERENCING if
+ the PNG datastream is embedded in
+ a MNG-1.0 datastream)
compression_type - (must be PNG_COMPRESSION_TYPE_BASE
for PNG 1.0)
interlace_type - (PNG_INTERLACE_NONE or
PNG_INTERLACE_ADAM7)
Any or all of interlace_type, compression_type, of
- filter_type can be
- NULL if you are not interested in their values.
+ filter_method can be NULL if you are
+ not interested in their values.
channels = png_get_channels(png_ptr, info_ptr);
channels - number of channels of info for the
info_ptr);
color_type = png_get_color_type(png_ptr,
info_ptr);
- filter_type = png_get_filter_type(png_ptr,
+ filter_method = png_get_filter_type(png_ptr,
info_ptr);
compression_type = png_get_compression_type(png_ptr,
info_ptr);
implies specific values of gAMA and
cHRM.
+ png_get_iCCP(png_ptr, info_ptr, &name,
+ &compression_type, &profile, &proflen);
+ name - The profile name.
+ compression - The compression type; always
+ PNG_COMPRESSION_TYPE_BASE for PNG 1.0.
+ You may give NULL to this argument to
+ ignore it.
+ profile - International Color Consortium color
+ profile data. May contain NULs.
+ proflen - length of profile data in bytes.
+
png_get_sBIT(png_ptr, info_ptr, &sig_bit);
sig_bit - the number of significant bits for
(PNG_INFO_sBIT) each of the gray,
&trans_values);
trans - array of transparent entries for
palette (PNG_INFO_tRNS)
- trans_values - transparent pixel for non-paletted
- images (PNG_INFO_tRNS)
+ trans_values - graylevel or color sample values of
+ the single transparent color for
+ non-paletted images (PNG_INFO_tRNS)
num_trans - number of transparent entries
(PNG_INFO_tRNS)
png_get_hIST(png_ptr, info_ptr, &hist);
(PNG_INFO_hIST)
hist - histogram of palette (array of
- png_color_16)
+ png_uint_16)
png_get_tIME(png_ptr, info_ptr, &mod_time);
mod_time - time image was last modified
png_get_bKGD(png_ptr, info_ptr, &background);
background - background color (PNG_VALID_bKGD)
+ valid 16-bit red, green and blue
+ values, regardless of color_type
- num_text = png_get_text(png_ptr, info_ptr, &text_ptr);
+ num_comments = png_get_text(png_ptr, info_ptr,
+ &text_ptr, &num_text);
+ num_comments - number of comments
text_ptr - array of png_text holding image
comments
- text_ptr[i]->key - keyword for comment.
- text_ptr[i]->text - text comments for current
- keyword.
- text_ptr[i]->compression - type of compression used
- on "text" PNG_TEXT_COMPRESSION_NONE
- or PNG_TEXT_COMPRESSION_zTXt
- num_text - number of comments
+ text_ptr[i].compression - type of compression used
+ on "text" PNG_TEXT_COMPRESSION_NONE
+ PNG_TEXT_COMPRESSION_zTXt
+ PNG_ITXT_COMPRESSION_NONE
+ PNG_ITXT_COMPRESSION_zTXt
+ text_ptr[i].key - keyword for comment. Must contain
+ 1-79 characters.
+ text_ptr[i].text - text comments for current
+ keyword. Can be empty.
+ text_ptr[i].text_length - length of text string,
+ after decompression, 0 for iTXt
+ text_ptr[i].itxt_length - length of itxt string,
+ after decompression, 0 for tEXt/zTXt
+ text_ptr[i].lang - language of comment (empty
+ string for unknown).
+ text_ptr[i].lang_key - keyword in UTF-8
+ (empty string for unknown).
+ num_text - number of comments (same as
+ num_comments; you can put NULL here
+ to avoid the duplication)
+ Note while png_set_text() will accept text, language,
+ and translated keywords that can be NULL pointers, the
+ structure returned by png_get_text will always contain
+ regular zero-terminated C strings. They might be
+ empty strings but they will never be NULL pointers.
+
+ num_spalettes = png_get_sPLT(png_ptr, info_ptr,
+ &palette_ptr);
+ palette_ptr - array of palette structures holding
+ contents of one or more sPLT chunks
+ read.
+ num_spalettes - number of sPLT chunks read.
png_get_oFFs(png_ptr, info_ptr, &offset_x, &offset_y,
- &unit_type);
+ &unit_type);
offset_x - positive offset from the left edge
of the screen
offset_y - positive offset from the top edge
unit_type - PNG_OFFSET_PIXEL, PNG_OFFSET_MICROMETER
png_get_pHYs(png_ptr, info_ptr, &res_x, &res_y,
- &unit_type);
+ &unit_type);
res_x - pixels/unit physical resolution in
x direction
res_y - pixels/unit physical resolution in
unit_type - PNG_RESOLUTION_UNKNOWN,
PNG_RESOLUTION_METER
+ png_get_sCAL(png_ptr, info_ptr, &unit, &width,
+ &height)
+ unit - physical scale units (an integer)
+ width - width of a pixel in physical scale units
+ height - height of a pixel in physical scale units
+ (width and height are doubles)
+
+ png_get_sCAL_s(png_ptr, info_ptr, &unit, &width,
+ &height)
+ unit - physical scale units (an integer)
+ width - width of a pixel in physical scale units
+ height - height of a pixel in physical scale units
+ (width and height are strings like "2.54")
+
+ num_unknown_chunks = png_get_unknown_chunks(png_ptr,
+ info_ptr, &unknowns)
+ unknowns - array of png_unknown_chunk
+ structures holding unknown chunks
+ unknowns[i].name - name of unknown chunk
+ unknowns[i].data - data of unknown chunk
+ unknowns[i].size - size of unknown chunk's data
+ unknowns[i].location - position of chunk in file
+
+ The value of "i" corresponds to the order in which the
+ chunks were read from the PNG file or inserted with the
+ png_set_unknown_chunks() function.
+
The data from the pHYs chunk can be retrieved in several convenient
forms:
res_x = png_get_x_pixels_per_meter(png_ptr,
- info_ptr)
+ info_ptr)
res_y = png_get_y_pixels_per_meter(png_ptr,
- info_ptr)
+ info_ptr)
res_x_and_y = png_get_pixels_per_meter(png_ptr,
- info_ptr)
+ info_ptr)
+ res_x = png_get_x_pixels_per_inch(png_ptr,
+ info_ptr)
+ res_y = png_get_y_pixels_per_inch(png_ptr,
+ info_ptr)
+ res_x_and_y = png_get_pixels_per_inch(png_ptr,
+ info_ptr)
aspect_ratio = png_get_pixel_aspect_ratio(png_ptr,
- info_ptr)
+ info_ptr)
(Each of these returns 0 [signifying "unknown"] if
the data is not present or if res_x is 0;
res_x_and_y is 0 if res_x != res_y)
+The data from the oFFs chunk can be retrieved in several convenient
+forms:
+
+ x_offset = png_get_x_offset_microns(png_ptr, info_ptr);
+ y_offset = png_get_y_offset_microns(png_ptr, info_ptr);
+ x_offset = png_get_x_offset_inches(png_ptr, info_ptr);
+ y_offset = png_get_y_offset_inches(png_ptr, info_ptr);
+
+ (Each of these returns 0 [signifying "unknown" if both
+ x and y are 0] if the data is not present or if the
+ chunk is present but the unit is the pixel)
+
For more information, see the png_info definition in png.h and the
PNG specification for chunk contents. Be careful with trusting
rowbytes, as some of the transformations could increase the space
Keywords should be limited to 79 Latin-1 characters without leading or
trailing spaces, but non-consecutive spaces are allowed within the
keyword. It is possible to have the same keyword any number of times.
-The text_ptr is an array of png_text structures, each holding pointer
-to a keyword and a pointer to a text string. Only the text string may
-be null. The keyword/text pairs are put into the array in the order
-that they are received. However, some or all of the text chunks may be
-after the image, so, to make sure you have read all the text chunks,
-don't mess with these until after you read the stuff after the image.
-This will be mentioned again below in the discussion that goes with
-png_read_end().
+The text_ptr is an array of png_text structures, each holding a
+pointer to a language string, a pointer to a keyword and a pointer to
+a text string. The text string, language code, and translated
+keyword may be empty or NULL pointers. The keyword/text
+pairs are put into the array in the order that they are received.
+However, some or all of the text chunks may be after the image, so, to
+make sure you have read all the text chunks, don't mess with these
+until after you read the stuff after the image. This will be
+mentioned again below in the discussion that goes with png_read_end().
+
+Input transformations
After you've read the header information, you can set up the library
to handle any special transformations of the image data. The various
grayscale images with bit depths of 2 or 4 or if there is a multiple-image
viewing application that wishes to treat all images in the same way.
- if (color_type == PNG_COLOR_TYPE_PALETTE &&
- bit_depth <= 8) png_set_expand(png_ptr);
+ if (color_type == PNG_COLOR_TYPE_PALETTE)
+ png_set_palette_to_rgb(png_ptr);
if (color_type == PNG_COLOR_TYPE_GRAY &&
- bit_depth < 8) png_set_expand(png_ptr);
+ bit_depth < 8) png_set_gray_1_2_4_to_8(png_ptr);
if (png_get_valid(png_ptr, info_ptr,
- PNG_INFO_tRNS)) png_set_expand(png_ptr);
+ PNG_INFO_tRNS)) png_set_tRNS_to_alpha(png_ptr);
+
+These three functions are actually aliases for png_set_expand(), added
+in libpng version 1.0.4, with the function names expanded to improve code
+readability. In some future version they may actually do different
+things.
PNG can have files with 16 bits per channel. If you only can handle
8 bits per channel, this will strip the pixels down to 8 bit.
if (bit_depth == 16)
png_set_strip_16(png_ptr);
-The png_set_background() function tells libpng to composite images
-with alpha or simple transparency against the supplied background
-color. If the PNG file contains a bKGD chunk (PNG_INFO_bKGD valid),
-you may use this color, or supply another color more suitable for
-the current display (e.g., the background color from a web page). You
-need to tell libpng whether the color is in the gamma space of the
-display (PNG_BACKGROUND_GAMMA_SCREEN for colors you supply), the file
-(PNG_BACKGROUND_GAMMA_FILE for colors from the bKGD chunk), or one
-that is neither of these gammas (PNG_BACKGROUND_GAMMA_UNIQUE - I don't
-know why anyone would use this, but it's here).
-
If, for some reason, you don't need the alpha channel on an image,
and you want to remove it rather than combining it with the background
(but the image author certainly had in mind that you *would* combine
if (color_type & PNG_COLOR_MASK_ALPHA)
png_set_strip_alpha(png_ptr);
+In PNG files, the alpha channel in an image
+is the level of opacity. If you need the alpha channel in an image to
+be the level of transparency instead of opacity, you can invert the
+alpha channel (or the tRNS chunk data) after it's read, so that 0 is
+fully opaque and 255 (in 8-bit or paletted images) or 65535 (in 16-bit
+images) is fully transparent, with
+
+ png_set_invert_alpha(png_ptr);
+
PNG files pack pixels of bit depths 1, 2, and 4 into bytes as small as
they can, resulting in, for example, 8 pixels per byte for 1 bit
files. This code expands to 1 pixel per byte without changing the
convert the PNG pixel data back to the original bit depth of the image.
This call reduces the pixels back down to the original bit depth:
- png_color_16p sig_bit;
+ png_color_8p sig_bit;
if (png_get_sBIT(png_ptr, info_ptr, &sig_bit))
png_set_shift(png_ptr, sig_bit);
color_type == PNG_COLOR_TYPE_RGB_ALPHA)
png_set_bgr(png_ptr);
-PNG files store RGB pixels packed into 3 bytes. This code expands them
-into 4 bytes for windowing systems that need them in this format:
+PNG files store RGB pixels packed into 3 or 6 bytes. This code expands them
+into 4 or 8 bytes for windowing systems that need them in this format:
- if (bit_depth == 8 && color_type ==
- PNG_COLOR_TYPE_RGB) png_set_filler(png_ptr,
- filler, PNG_FILLER_BEFORE);
+ if (color_type == PNG_COLOR_TYPE_RGB)
+ png_set_filler(png_ptr, filler, PNG_FILLER_BEFORE);
where "filler" is the 8 or 16-bit number to fill with, and the location is
either PNG_FILLER_BEFORE or PNG_FILLER_AFTER, depending upon whether
you want the filler before the RGB or after. This transformation
-does not affect images that already have full alpha channels.
+does not affect images that already have full alpha channels. To add an
+opaque alpha channel, use filler=0xff or 0xffff and PNG_FILLER_AFTER which
+will generate RGBA pixels.
If you are reading an image with an alpha channel, and you need the
data as ARGB instead of the normal PNG format RGBA:
png_set_gray_to_rgb(png_ptr);
Conversely, you can convert an RGB or RGBA image to grayscale or grayscale
-with alpha. This is intended for conversion of images that really are
-gray (red == green == blue), so the function simply strips out the red
-and blue channels, leaving the green channel in the gray position.
+with alpha.
if (color_type == PNG_COLOR_TYPE_RGB ||
color_type == PNG_COLOR_TYPE_RGB_ALPHA)
- png_set_rgb_to_gray(png_ptr, error_action,
- float red_weight, float green_weight);
+ png_set_rgb_to_gray_fixed(png_ptr, error_action,
+ int red_weight, int green_weight);
error_action = 1: silently do the conversion
error_action = 2: issue a warning if the original
image has any pixel where
red != green or red != blue
- red_weight: weight of red component
- (NULL -> default 54/256)
- green_weight: weight of green component
- (NULL -> default 183/256)
+ red_weight: weight of red component times 100000
+ green_weight: weight of green component times 100000
+ If either weight is negative, default
+ weights (21268, 71514) are used.
If you have set error_action = 1 or 2, you can
later check whether the image really was gray, after processing
will be silently converted to grayscale, using the green channel
data, regardless of the error_action setting.
-With 0.0<=red_weight+green_weight<=1.0,
+With red_weight+green_weight<=100000,
the normalized graylevel is computed:
- int rw = red_weight * 256;
- int gw = green_weight * 256;
- int bw = 256 - (rw + gw);
- gray = (rw*red + gw*green + bw*blue)/256;
+ int rw = red_weight * 65536;
+ int gw = green_weight * 65536;
+ int bw = 65536 - (rw + gw);
+ gray = (rw*red + gw*green + bw*blue)/65536;
The default values approximate those recommended in the Charles
Poynton's Color FAQ, <http://www.inforamp.net/~poynton/>
Libpng approximates this with
- Y = 0.211 * R + 0.715 * G + 0.074 * B
+ Y = 0.21268 * R + 0.7151 * G + 0.07217 * B
which can be expressed with integers as
- Y = (54 * R + 183 * G + 19 * B)/256
+ Y = (6969 * R + 23434 * G + 2365 * B)/32768
The calculation is done in a linear colorspace, if the image gamma
is known.
-If you have a grayscale and you are using png_set_expand() to change to
+If you have a grayscale and you are using png_set_expand_depth(),
+png_set_expand(), or png_set_gray_to_rgb to change to truecolor or to
a higher bit-depth, you must either supply the background color as a gray
value at the original file bit-depth (need_expand = 1) or else supply the
background color as an RGB triplet at the final, expanded bit depth
png_set_background(png_ptr, &my_background,
PNG_BACKGROUND_GAMMA_SCREEN, 0, 1.0);
+The png_set_background() function tells libpng to composite images
+with alpha or simple transparency against the supplied background
+color. If the PNG file contains a bKGD chunk (PNG_INFO_bKGD valid),
+you may use this color, or supply another color more suitable for
+the current display (e.g., the background color from a web page). You
+need to tell libpng whether the color is in the gamma space of the
+display (PNG_BACKGROUND_GAMMA_SCREEN for colors you supply), the file
+(PNG_BACKGROUND_GAMMA_FILE for colors from the bKGD chunk), or one
+that is neither of these gammas (PNG_BACKGROUND_GAMMA_UNIQUE - I don't
+know why anyone would use this, but it's here).
+
To properly display PNG images on any kind of system, the application needs
to know what the display gamma is. Ideally, the user will know this, and
the application will allow them to set it. One method of allowing the user
-to set the display gamma separately for each system is to check for the
-DISPLAY_GAMMA and VIEWING_GAMMA environment variables or for a SCREEN_GAMMA
-environment variable, which will hopefully be correctly set.
-
-Note that display_gamma is the gamma of your display, while screen_gamma is
-the overall gamma correction required to produce pleasing results,
-which depends on the lighting conditions in the surrounding environment.
-Screen_gamma is display_gamma/viewing_gamma, where viewing_gamma is
-the amount of additional gamma correction needed to compensate for
-a (viewing_gamma=1.25) environment. In a dim or brightly lit room, no
-compensation other than the display_gamma is needed (viewing_gamma=1.0).
+to set the display gamma separately for each system is to check for a
+SCREEN_GAMMA or DISPLAY_GAMMA environment variable, which will hopefully be
+correctly set.
+
+Note that display_gamma is the overall gamma correction required to produce
+pleasing results, which depends on the lighting conditions in the surrounding
+environment. In a dim or brightly lit room, no compensation other than
+the physical gamma exponent of the monitor is needed, while in a dark room
+a slightly smaller exponent is better.
+
+ double gamma, screen_gamma;
if (/* We have a user-defined screen
gamma value */)
else if ((gamma_str = getenv("SCREEN_GAMMA"))
!= NULL)
{
- screen_gamma = atof(gamma_str);
+ screen_gamma = (double)atof(gamma_str);
}
/* If we don't have another value */
else
if (png_get_valid(png_ptr, info_ptr,
PNG_INFO_PLTE))
{
- png_color_16p histogram;
+ png_uint_16p histogram;
png_get_hIST(png_ptr, info_ptr,
&histogram);
The following code will reverse this (make black be one and white be
zero):
- if (bit_depth == 1 && color_type == PNG_COLOR_GRAY)
+ if (bit_depth == 1 && color_type == PNG_COLOR_TYPE_GRAY)
+ png_set_invert_mono(png_ptr);
+
+This function can also be used to invert grayscale and gray-alpha images:
+
+ if (color_type == PNG_COLOR_TYPE_GRAY ||
+ color_type == PNG_COLOR_TYPE_GRAY_ALPHA)
png_set_invert_mono(png_ptr);
PNG files store 16 bit pixels in network byte order (big-endian,
if (bit_depth < 8)
png_set_packswap(png_ptr);
+Finally, you can write your own transformation function if none of
+the existing ones meets your needs. This is done by setting a callback
+with
+
+ png_set_read_user_transform_fn(png_ptr,
+ read_transform_fn);
+
+You must supply the function
+
+ void read_transform_fn(png_ptr ptr, row_info_ptr
+ row_info, png_bytep data)
+
+See pngtest.c for a working example. Your function will be called
+after all of the other transformations have been processed.
+
+You can also set up a pointer to a user structure for use by your
+callback function, and you can inform libpng that your transform
+function will change the number of channels or bit depth with the
+function
+
+ png_set_user_transform_info(png_ptr, user_ptr,
+ user_depth, user_channels);
+
+The user's application, not libpng, is responsible for allocating and
+freeing any memory required for the user structure.
+
+You can retrieve the pointer via the function
+png_get_user_transform_ptr(). For example:
+
+ voidp read_user_transform_ptr =
+ png_get_user_transform_ptr(png_ptr);
+
The last thing to handle is interlacing; this is covered in detail below,
but you must call the function here if you want libpng to handle expansion
of the interlaced image.
array of pointers to each row, as it will be needed for some
of the functions below.
+Reading image data
+
After you've allocated memory, you can read the image data.
The simplest way to do this is in one function call. If you are
allocating enough memory to hold the whole image, you can just
where row_pointers is the same as in the png_read_image() call.
If you are doing this just one row at a time, you can do this with
-row_pointers:
+a single row_pointer instead of an array of row_pointers:
- png_bytep row_pointers = row;
- png_read_row(png_ptr, &row_pointers, NULL);
+ png_bytep row_pointer = row;
+ png_read_row(png_ptr, row_pointer, NULL);
-If the file is interlaced (info_ptr->interlace_type != 0), things get
-somewhat harder. The only current (PNG Specification version 1.0)
+If the file is interlaced (interlace_type != 0 in the IHDR chunk), things
+get somewhat harder. The only current (PNG Specification version 1.2)
interlacing type for PNG is (interlace_type == PNG_INTERLACE_ADAM7)
is a somewhat complicated 2D interlace scheme, known as Adam7, that
breaks down an image into seven smaller images of varying size, based
png_read_rows(png_ptr, NULL, row_pointers,
number_of_rows);
-After you are finished reading the image, you can finish reading
-the file. If you are interested in comments or time, which may be
-stored either before or after the image data, you should pass the
-separate png_info struct if you want to keep the comments from
-before and after the image separate. If you are not interested, you
-can pass NULL.
+Finishing a sequential read
+
+After you are finished reading the image through either the high- or
+low-level interfaces, you can finish reading the file. If you are
+interested in comments or time, which may be stored either before or
+after the image data, you should pass the separate png_info struct if
+you want to keep the comments from before and after the image
+separate. If you are not interested, you can pass NULL.
png_read_end(png_ptr, end_info);
png_destroy_read_struct(&png_ptr, &info_ptr,
&end_info);
-For a more compact example of reading a PNG image, see the file example.c.
+It is also possible to individually free the info_ptr members that
+point to libpng-allocated storage with the following function:
+
+ png_free_data(png_ptr, info_ptr, mask, seq)
+ mask - identifies data to be freed, a mask
+ containing the logical OR of one or
+ more of
+ PNG_FREE_PLTE, PNG_FREE_TRNS,
+ PNG_FREE_HIST, PNG_FREE_ICCP,
+ PNG_FREE_PCAL, PNG_FREE_ROWS,
+ PNG_FREE_SCAL, PNG_FREE_SPLT,
+ PNG_FREE_TEXT, PNG_FREE_UNKN,
+ or simply PNG_FREE_ALL
+ seq - sequence number of item to be freed
+ (-1 for all items)
+
+This function may be safely called when the relevant storage has
+already been freed, or has not yet been allocated, or was allocated
+by the user and not by libpng, and will in those
+cases do nothing. The "seq" parameter is ignored if only one item
+of the selected data type, such as PLTE, is allowed. If "seq" is not
+-1, and multiple items are allowed for the data type identified in
+the mask, such as text or sPLT, only the n'th item in the structure
+is freed, where n is "seq".
+
+The default behavior is only to free data that was allocated internally
+by libpng. This can be changed, so that libpng will not free the data,
+or so that it will free data that was allocated by the user with png_malloc()
+or png_zalloc() and passed in via a png_set_*() function, with
+
+ png_data_freer(png_ptr, info_ptr, freer, mask)
+ mask - which data elements are affected
+ same choices as in png_free_data()
+ freer - one of
+ PNG_DESTROY_WILL_FREE_DATA
+ PNG_SET_WILL_FREE_DATA
+ PNG_USER_WILL_FREE_DATA
+
+This function only affects data that has already been allocated.
+You can call this function after reading the PNG data but before calling
+any png_set_*() functions, to control whether the user or the png_set_*()
+function is responsible for freeing any existing data that might be present,
+and again after the png_set_*() functions to control whether the user
+or png_destroy_*() is supposed to free the data. When the user assumes
+responsibility for libpng-allocated data, the application must use
+png_free() to free it, and when the user transfers responsibility to libpng
+for data that the user has allocated, the user must have used png_malloc()
+or png_zalloc() to allocate it.
+
+If you allocated your row_pointers in a single block, as suggested above in
+the description of the high level read interface, you must not transfer
+responsibility for freeing it to the png_set_rows or png_read_destroy function,
+because they would also try to free the individual row_pointers[i].
+
+If you allocated text_ptr.text, text_ptr.lang, and text_ptr.translated_keyword
+separately, do not transfer responsibility for freeing text_ptr to libpng,
+because when libpng fills a png_text structure it combines these members with
+the key member, and png_free_data() will free only text_ptr.key. Similarly,
+if you transfer responsibility for free'ing text_ptr from libpng to your
+application, your application must not separately free those members.
+
+The png_free_data() function will turn off the "valid" flag for anything
+it frees. If you need to turn the flag off for a chunk that was freed by your
+application instead of by libpng, you can use
+
+ png_set_invalid(png_ptr, info_ptr, mask);
+ mask - identifies the chunks to be made invalid,
+ containing the logical OR of one or
+ more of
+ PNG_INFO_gAMA, PNG_INFO_sBIT,
+ PNG_INFO_cHRM, PNG_INFO_PLTE,
+ PNG_INFO_tRNS, PNG_INFO_bKGD,
+ PNG_INFO_hIST, PNG_INFO_pHYs,
+ PNG_INFO_oFFs, PNG_INFO_tIME,
+ PNG_INFO_pCAL, PNG_INFO_sRGB,
+ PNG_INFO_iCCP, PNG_INFO_sPLT,
+ PNG_INFO_sCAL, PNG_INFO_IDAT
+For a more compact example of reading a PNG image, see the file example.c.
-Reading PNG files progressively:
+Reading PNG files progressively
The progressive reader is slightly different then the non-progressive
reader. Instead of calling png_read_info(), png_read_rows(), and
(PNG_LIBPNG_VER_STRING, (png_voidp)user_error_ptr,
user_error_fn, user_warning_fn);
if (!png_ptr)
- return -1;
+ return (ERROR);
info_ptr = png_create_info_struct(png_ptr);
if (!info_ptr)
{
png_destroy_read_struct(&png_ptr, (png_infopp)NULL,
(png_infopp)NULL);
- return -1;
+ return (ERROR);
}
- if (setjmp(png_ptr->jmpbuf))
+ if (setjmp(png_jmpbuf(png_ptr)))
{
png_destroy_read_struct(&png_ptr, &info_ptr,
(png_infopp)NULL);
- return -1;
+ return (ERROR);
}
/* This one's new. You can provide functions
int
process_data(png_bytep buffer, png_uint_32 length)
{
- if (setjmp(png_ptr->jmpbuf))
+ if (setjmp(png_jmpbuf(png_ptr)))
{
png_destroy_read_struct(&png_ptr, &info_ptr,
(png_infopp)NULL);
- return -1;
+ return (ERROR);
}
/* This one's new also. Simply give it a chunk
importance is repeated here, so you won't have to constantly look
back up in the reading section to understand writing.
+Setup
+
You will want to do the I/O initialization before you get into libpng,
so if it doesn't work, you don't have anything to undo. If you are not
using the standard I/O functions, you will need to replace them with
FILE *fp = fopen(file_name, "wb");
if (!fp)
{
- return;
+ return (ERROR);
}
Next, png_struct and png_info need to be allocated and initialized.
(PNG_LIBPNG_VER_STRING, (png_voidp)user_error_ptr,
user_error_fn, user_warning_fn);
if (!png_ptr)
- return;
+ return (ERROR);
png_infop info_ptr = png_create_info_struct(png_ptr);
if (!info_ptr)
{
png_destroy_write_struct(&png_ptr,
(png_infopp)NULL);
- return;
+ return (ERROR);
}
If you want to use your own memory allocation routines,
define PNG_USER_MEM_SUPPORTED and use
-png_create_write_struct_2() instead of png_create_read_struct():
+png_create_write_struct_2() instead of png_create_write_struct():
png_structp png_ptr = png_create_write_struct_2
(PNG_LIBPNG_VER_STRING, (png_voidp)user_error_ptr,
After you have these structures, you will need to set up the
error handling. When libpng encounters an error, it expects to
longjmp() back to your routine. Therefore, you will need to call
-setjmp() and pass the png_ptr->jmpbuf. If you
+setjmp() and pass the png_jmpbuf(png_ptr). If you
write the file from different routines, you will need to update
-the jmpbuf field every time you enter a new routine that will
-call a png_ function. See your documentation of setjmp/longjmp
+the png_jmpbuf(png_ptr) every time you enter a new routine that will
+call a png_*() function. See your documentation of setjmp/longjmp
for your compiler for more information on setjmp/longjmp. See
the discussion on libpng error handling in the Customizing Libpng
section below for more information on the libpng error handling.
- if (setjmp(png_ptr->jmpbuf))
+ if (setjmp(png_jmpbuf(png_ptr)))
{
- png_destroy_write_struct(&png_ptr, &info_ptr);
- fclose(fp);
- return;
+ png_destroy_write_struct(&png_ptr, &info_ptr);
+ fclose(fp);
+ return (ERROR);
}
...
return;
+If you would rather avoid the complexity of setjmp/longjmp issues,
+you can compile libpng with PNG_SETJMP_NOT_SUPPORTED, in which case
+errors will result in a call to PNG_ABORT() which defaults to abort().
+
Now you need to set up the output code. The default for libpng is to
use the C function fwrite(). If you use this, you will need to pass a
valid FILE * in the function png_init_io(). Be sure that the file is
png_init_io(png_ptr, fp);
+Write callbacks
+
At this point, you can set up a callback function that will be
called after each row has been written, which you can use to control
a progress meter or the like. It's demonstrated in pngtest.c.
You must supply a function
- void write_row_callback(png_ptr, png_uint_32 row, int pass);
+ void write_row_callback(png_ptr, png_uint_32 row,
+ int pass);
{
/* put your code here */
}
have no special needs in this area, let the library do what it wants by
not calling this function at all, as it has been tuned to deliver a good
speed/compression ratio. The second parameter to png_set_filter() is
-the filter method, for which the only valid value is '0' (as of the
-October 1996 PNG specification, version 1.0). The third parameter is a
-flag that indicates which filter type(s) are to be tested for each
-scanline. See the Compression Library for details on the specific filter
+the filter method, for which the only valid values are 0 (as of the
+July 1999 PNG specification, version 1.2) or 64 (if you are writing
+a PNG datastream that is to be embedded in a MNG datastream). The third
+parameter is a flag that indicates which filter type(s) are to be tested
+for each scanline. See the PNG specification for details on the specific filter
types.
/* turn on or off filtering, and/or choose
- specific filters */
+ specific filters. You can use either a single
+ PNG_FILTER_VALUE_NAME or the logical OR of one
+ or more PNG_FILTER_NAME masks. */
png_set_filter(png_ptr, 0,
- PNG_FILTER_NONE | PNG_FILTER_SUB |
- PNG_FILTER_PAETH);
-
-The png_set_compression_???() functions interface to the zlib compression
+ PNG_FILTER_NONE | PNG_FILTER_VALUE_NONE |
+ PNG_FILTER_SUB | PNG_FILTER_VALUE_SUB |
+ PNG_FILTER_UP | PNG_FILTER_VALUE_UP |
+ PNG_FILTER_AVE | PNG_FILTER_VALUE_AVE |
+ PNG_FILTER_PAETH | PNG_FILTER_VALUE_PAETH|
+ PNG_ALL_FILTERS);
+
+If an application
+wants to start and stop using particular filters during compression,
+it should start out with all of the filters (to ensure that the previous
+row of pixels will be stored in case it's needed later), and then add
+and remove them after the start of compression.
+
+If you are writing a PNG datastream that is to be embedded in a MNG
+datastream, the second parameter can be either 0 or 64.
+
+The png_set_compression_*() functions interface to the zlib compression
library, and should mostly be ignored unless you really know what you are
doing. The only generally useful call is png_set_compression_level()
which changes how much time zlib spends on trying to compress the image
-data. See the Compression Library for details on the compression levels.
+data. See the Compression Library (zlib.h and algorithm.txt, distributed
+with zlib) for details on the compression levels.
/* set the zlib compression level */
png_set_compression_level(png_ptr,
Z_DEFAULT_STRATEGY);
png_set_compression_window_bits(png_ptr, 15);
png_set_compression_method(png_ptr, 8);
+ png_set_compression_buffer_size(png_ptr, 8192)
+
+extern PNG_EXPORT(void,png_set_zbuf_size)
+
+Setting the contents of info for output
You now need to fill in the png_info structure with all the data you
wish to write before the actual image. Note that the only thing you
are allowed to write after the image is the text chunks and the time
-chunk (as of PNG Specification 1.0, anyway). See png_write_end() and
+chunk (as of PNG Specification 1.2, anyway). See png_write_end() and
the latest PNG specification for more information on that. If you
wish to write them before the image, fill them in now, and flag that
data as being valid. If you want to wait until after the data, don't
png_set_IHDR(png_ptr, info_ptr, width, height,
bit_depth, color_type, interlace_type,
- compression_type, filter_type)
+ compression_type, filter_method)
width - holds the width of the image
in pixels (up to 2^31).
height - holds the height of the image
PNG_INTERLACE_ADAM7
compression_type - (must be
PNG_COMPRESSION_TYPE_DEFAULT)
- filter_type - (must be PNG_FILTER_TYPE_DEFAULT)
+ filter_method - (must be PNG_FILTER_TYPE_DEFAULT
+ or, if you are writing a PNG to
+ be embedded in a MNG datastream,
+ can also be
+ PNG_INTRAPIXEL_DIFFERENCING)
png_set_PLTE(png_ptr, info_ptr, palette,
num_palette);
Color Consortium
(http://www.color.org).
It can be one of
- PNG_SRGB_INTENT_SATURATION,
- PNG_SRGB_INTENT_PERCEPTUAL,
- PNG_SRGB_INTENT_ABSOLUTE, or
- PNG_SRGB_INTENT_RELATIVE.
+ PNG_sRGB_INTENT_SATURATION,
+ PNG_sRGB_INTENT_PERCEPTUAL,
+ PNG_sRGB_INTENT_ABSOLUTE, or
+ PNG_sRGB_INTENT_RELATIVE.
png_set_sRGB_gAMA_and_cHRM(png_ptr, info_ptr,
that are consistent with sRGB to be
written.
+ png_set_iCCP(png_ptr, info_ptr, name, compression_type,
+ profile, proflen);
+ name - The profile name.
+ compression - The compression type; always
+ PNG_COMPRESSION_TYPE_BASE for PNG 1.0.
+ You may give NULL to this argument to
+ ignore it.
+ profile - International Color Consortium color
+ profile data. May contain NULs.
+ proflen - length of profile data in bytes.
+
png_set_sBIT(png_ptr, info_ptr, sig_bit);
sig_bit - the number of significant bits for
(PNG_INFO_sBIT) each of the gray, red,
trans_values);
trans - array of transparent entries for
palette (PNG_INFO_tRNS)
- trans_values - transparent pixel for non-paletted
- images (PNG_INFO_tRNS)
+ trans_values - graylevel or color sample values of
+ the single transparent color for
+ non-paletted images (PNG_INFO_tRNS)
num_trans - number of transparent entries
(PNG_INFO_tRNS)
png_set_hIST(png_ptr, info_ptr, hist);
(PNG_INFO_hIST)
hist - histogram of palette (array of
- png_color_16)
+ png_uint_16)
png_set_tIME(png_ptr, info_ptr, mod_time);
mod_time - time image was last modified
png_set_text(png_ptr, info_ptr, text_ptr, num_text);
text_ptr - array of png_text holding image
comments
- text_ptr[i]->key - keyword for comment.
- text_ptr[i]->text - text comments for current
- keyword.
- text_ptr[i]->compression - type of compression used
- on "text" PNG_TEXT_COMPRESSION_NONE or
- PNG_TEXT_COMPRESSION_zTXt
- num_text - number of comments in text_ptr
+ text_ptr[i].compression - type of compression used
+ on "text" PNG_TEXT_COMPRESSION_NONE
+ PNG_TEXT_COMPRESSION_zTXt
+ PNG_ITXT_COMPRESSION_NONE
+ PNG_ITXT_COMPRESSION_zTXt
+ text_ptr[i].key - keyword for comment. Must contain
+ 1-79 characters.
+ text_ptr[i].text - text comments for current
+ keyword. Can be NULL or empty.
+ text_ptr[i].text_length - length of text string,
+ after decompression, 0 for iTXt
+ text_ptr[i].itxt_length - length of itxt string,
+ after decompression, 0 for tEXt/zTXt
+ text_ptr[i].lang - language of comment (NULL or
+ empty for unknown).
+ text_ptr[i].translated_keyword - keyword in UTF-8 (NULL
+ or empty for unknown).
+ num_text - number of comments
+
+ png_set_sPLT(png_ptr, info_ptr, &palette_ptr,
+ num_spalettes);
+ palette_ptr - array of png_sPLT_struct structures
+ to be added to the list of palettes
+ in the info structure.
+ num_spalettes - number of palette structures to be
+ added.
png_set_oFFs(png_ptr, info_ptr, offset_x, offset_y,
unit_type);
unit_type - PNG_RESOLUTION_UNKNOWN,
PNG_RESOLUTION_METER
-In PNG files, the alpha channel in an image is the level of opacity.
-If your data is supplied as a level of transparency, you can invert the
-alpha channel before you write it, so that 0 is fully transparent and 255
-(in 8-bit or paletted images) or 65535 (in 16-bit images) is fully opaque,
-with
-
- png_set_invert_alpha(png_ptr);
-
-This must appear here instead of later with the other transformations
-because in the case of paletted images the tRNS chunk data has to
-be inverted before the tRNS chunk is written. If your image is not a
-paletted image, the tRNS data (which in such cases represents a single
-color to be rendered as transparent) won't be changed.
+ png_set_sCAL(png_ptr, info_ptr, unit, width, height)
+ unit - physical scale units (an integer)
+ width - width of a pixel in physical scale units
+ height - height of a pixel in physical scale units
+ (width and height are doubles)
+
+ png_set_sCAL_s(png_ptr, info_ptr, unit, width, height)
+ unit - physical scale units (an integer)
+ width - width of a pixel in physical scale units
+ height - height of a pixel in physical scale units
+ (width and height are strings like "2.54")
+
+ png_set_unknown_chunks(png_ptr, info_ptr, &unknowns,
+ num_unknowns)
+ unknowns - array of png_unknown_chunk
+ structures holding unknown chunks
+ unknowns[i].name - name of unknown chunk
+ unknowns[i].data - data of unknown chunk
+ unknowns[i].size - size of unknown chunk's data
+ unknowns[i].location - position to write chunk in file
+ 0: do not write chunk
+ PNG_HAVE_IHDR: before PLTE
+ PNG_HAVE_PLTE: before IDAT
+ PNG_AFTER_IDAT: after IDAT
+
+The "location" member is set automatically according to
+what part of the output file has already been written.
+You can change its value after calling png_set_unknown_chunks()
+as demonstrated in pngtest.c. Within each of the "locations",
+the chunks are sequenced according to their position in the
+structure (that is, the value of "i", which is the order in which
+the chunk was either read from the input file or defined with
+png_set_unknown_chunks).
A quick word about text and num_text. text is an array of png_text
structures. num_text is the number of valid structures in the array.
-If you want, you can use max_text to hold the size of the array, but
-libpng ignores it for writing (it does use it for reading). Each
-png_text structure holds a keyword-text value, and a compression type.
+Each png_text structure holds a language code, a keyword, a text value,
+and a compression type.
+
The compression types have the same valid numbers as the compression
types of the image data. Currently, the only valid number is zero.
However, you can store text either compressed or uncompressed, unlike
images, which always have to be compressed. So if you don't want the
text compressed, set the compression type to PNG_TEXT_COMPRESSION_NONE.
+Because tEXt and zTXt chunks don't have a language field, if you
+specify PNG_TEXT_COMPRESSION_NONE or PNG_TEXT_COMPRESSION_zTXt
+any language code or translated keyword will not be written out.
+
Until text gets around 1000 bytes, it is not worth compressing it.
After the text has been written out to the file, the compression type
is set to PNG_TEXT_COMPRESSION_NONE_WR or PNG_TEXT_COMPRESSION_zTXt_WR,
is compressed anyway, so the compression would be meaningless.
PNG supports modification time via the png_time structure. Two
-conversion routines are proved, png_convert_from_time_t() for
+conversion routines are provided, png_convert_from_time_t() for
time_t and png_convert_from_struct_tm() for struct tm. The
time_t routine uses gmtime(). You don't have to use either of
these, but if you wish to fill in the png_time structure directly,
png_convert_to_rfc1123(png_timep) is provided to convert from PNG
time to an RFC 1123 format string.
-You are now ready to write all the file information up to the actual
-image data. You do this with a call to png_write_info().
+Writing unknown chunks
+
+You can use the png_set_unknown_chunks function to queue up chunks
+for writing. You give it a chunk name, raw data, and a size; that's
+all there is to it. The chunks will be written by the next following
+png_write_info_before_PLTE, png_write_info, or png_write_end function.
+Any chunks previously read into the info structure's unknown-chunk
+list will also be written out in a sequence that satisfies the PNG
+specification's ordering rules.
+
+The high-level write interface
+
+At this point there are two ways to proceed; through the high-level
+write interface, or through a sequence of low-level write operations.
+You can use the high-level interface if your image data is present
+in the info structure. All defined output
+transformations are permitted, enabled by the following masks.
+
+ PNG_TRANSFORM_IDENTITY No transformation
+ PNG_TRANSFORM_PACKING Pack 1, 2 and 4-bit samples
+ PNG_TRANSFORM_PACKSWAP Change order of packed
+ pixels to LSB first
+ PNG_TRANSFORM_INVERT_MONO Invert monochrome images
+ PNG_TRANSFORM_SHIFT Normalize pixels to the
+ sBIT depth
+ PNG_TRANSFORM_BGR Flip RGB to BGR, RGBA
+ to BGRA
+ PNG_TRANSFORM_SWAP_ALPHA Flip RGBA to ARGB or GA
+ to AG
+ PNG_TRANSFORM_INVERT_ALPHA Change alpha from opacity
+ to transparency
+ PNG_TRANSFORM_SWAP_ENDIAN Byte-swap 16-bit samples
+ PNG_TRANSFORM_STRIP_FILLER Strip out filler bytes.
+
+If you have valid image data in the info structure (you can use
+png_set_rows() to put image data in the info structure), simply do this:
+
+ png_write_png(png_ptr, info_ptr, png_transforms, NULL)
+
+where png_transforms is an integer containing the logical OR of some set of
+transformation flags. This call is equivalent to png_write_info(),
+followed the set of transformations indicated by the transform mask,
+then png_write_image(), and finally png_write_end().
+
+(The final parameter of this call is not yet used. Someday it might point
+to transformation parameters required by some future output transform.)
+
+The low-level write interface
+
+If you are going the low-level route instead, you are now ready to
+write all the file information up to the actual image data. You do
+this with a call to png_write_info().
+
+ png_write_info(png_ptr, info_ptr);
+
+Note that there is one transformation you may need to do before
+png_write_info(). In PNG files, the alpha channel in an image is the
+level of opacity. If your data is supplied as a level of
+transparency, you can invert the alpha channel before you write it, so
+that 0 is fully transparent and 255 (in 8-bit or paletted images) or
+65535 (in 16-bit images) is fully opaque, with
+
+ png_set_invert_alpha(png_ptr);
+
+This must appear before png_write_info() instead of later with the
+other transformations because in the case of paletted images the tRNS
+chunk data has to be inverted before the tRNS chunk is written. If
+your image is not a paletted image, the tRNS data (which in such cases
+represents a single color to be rendered as transparent) won't need to
+be changed, and you can safely do this transformation after your
+png_write_info() call.
+
+If you need to write a private chunk that you want to appear before
+the PLTE chunk when PLTE is present, you can write the PNG info in
+two steps, and insert code to write your own chunk between them:
+ png_write_info_before_PLTE(png_ptr, info_ptr);
+ png_set_unknown_chunks(png_ptr, info_ptr, ...);
png_write_info(png_ptr, info_ptr);
After you've written the file information, you can set up the library
data. For example, don't swap red and blue on grayscale data.
PNG files store RGB pixels packed into 3 or 6 bytes. This code tells
-the library to expand the input data to 4 or 8 bytes per pixel
-(or expand 1 or 2-byte grayscale data to 2 or 4 bytes per pixel).
+the library to strip input data that has 4 or 8 bytes per pixel down
+to 3 or 6 bytes (or strip 2 or 4-byte grayscale+filler data to 1 or 2
+bytes per pixel).
png_set_filler(png_ptr, 0, PNG_FILLER_BEFORE);
-where the 0 is the value that will be put in the 4th byte, and the
-location is either PNG_FILLER_BEFORE or PNG_FILLER_AFTER, depending
-upon whether the filler byte is stored XRGB or RGBX.
+where the 0 is unused, and the location is either PNG_FILLER_BEFORE or
+PNG_FILLER_AFTER, depending upon whether the filler byte in the pixel
+is stored XRGB or RGBX.
PNG files pack pixels of bit depths 1, 2, and 4 into bytes as small as
they can, resulting in, for example, 8 pixels per byte for 1 bit files.
PNG files reduce possible bit depths to 1, 2, 4, 8, and 16. If your
data is of another bit depth, you can write an sBIT chunk into the
-file so that decoders can get the original data if desired.
+file so that decoders can recover the original data if desired.
/* Set the true bit depth of the image data */
if (color_type & PNG_COLOR_MASK_COLOR)
row_info, png_bytep data)
See pngtest.c for a working example. Your function will be called
-before any of the other transformations have been processed.
+before any of the other transformations are processed.
+
+You can also set up a pointer to a user structure for use by your
+callback function.
+
+ png_set_user_transform_info(png_ptr, user_ptr, 0, 0);
+
+The user_channels and user_depth parameters of this function are ignored
+when writing; you can set them to zero as shown.
+
+You can retrieve the pointer via the function png_get_user_transform_ptr().
+For example:
+
+ voidp write_user_transform_ptr =
+ png_get_user_transform_ptr(png_ptr);
It is possible to have libpng flush any pending output, either manually,
or automatically after a certain number of lines have been written. To
only degrade the compression performance by a few percent over images
that do not use flushing.
+Writing the image data
+
That's it for the transformations. Now you can write the image data.
-The simplest way to do this is in one function call. If have the
+The simplest way to do this is in one function call. If you have the
whole image in memory, you can just call png_write_image() and libpng
will write the image. You will need to pass in an array of pointers to
each row. This function automatically handles interlacing, so you don't
row_pointers is the same as in the png_write_image() call.
If you are just writing one row at a time, you can do this with
-row_pointers:
+a single row_pointer instead of an array of row_pointers:
png_bytep row_pointer = row;
- png_write_row(png_ptr, &row_pointer);
+ png_write_row(png_ptr, row_pointer);
When the file is interlaced, things can get a good deal more
-complicated. The only currently (as of February 1998 -- PNG Specification
-version 1.0, dated October 1996) defined interlacing scheme for PNG files
+complicated. The only currently (as of the PNG Specification
+version 1.2, dated July 1999) defined interlacing scheme for PNG files
is the "Adam7" interlace scheme, that breaks down an
image into seven smaller images of varying size. libpng will build
these images for you, or you can do them yourself. If you want to
you may want to read about interlacing in the PNG specification,
and only update the rows that are actually used.
+Finishing a sequential write
+
After you are finished writing the image, you should finish writing
the file. If you are interested in writing comments or time, you should
pass an appropriately filled png_info pointer. If you are not interested,
png_destroy_write_struct(&png_ptr, &info_ptr);
-You must free any data you allocated for info_ptr, such as comments,
-palette, or histogram, before the call to png_destroy_write_struct();
-
+It is also possible to individually free the info_ptr members that
+point to libpng-allocated storage with the following function:
+
+ png_free_data(png_ptr, info_ptr, mask, seq)
+ mask - identifies data to be freed, a mask
+ containing the logical OR of one or
+ more of
+ PNG_FREE_PLTE, PNG_FREE_TRNS,
+ PNG_FREE_HIST, PNG_FREE_ICCP,
+ PNG_FREE_PCAL, PNG_FREE_ROWS,
+ PNG_FREE_SCAL, PNG_FREE_SPLT,
+ PNG_FREE_TEXT, PNG_FREE_UNKN,
+ or simply PNG_FREE_ALL
+ seq - sequence number of item to be freed
+ (-1 for all items)
+
+This function may be safely called when the relevant storage has
+already been freed, or has not yet been allocated, or was allocated
+by the user and not by libpng, and will in those
+cases do nothing. The "seq" parameter is ignored if only one item
+of the selected data type, such as PLTE, is allowed. If "seq" is not
+-1, and multiple items are allowed for the data type identified in
+the mask, such as text or sPLT, only the n'th item in the structure
+is freed, where n is "seq".
+
+If you allocated data such as a palette that you passed
+in to libpng with png_set_*, you must not free it until just before the call to
+png_destroy_write_struct().
+
+The default behavior is only to free data that was allocated internally
+by libpng. This can be changed, so that libpng will not free the data,
+or so that it will free data that was allocated by the user with png_malloc()
+or png_zalloc() and passed in via a png_set_*() function, with
+
+ png_data_freer(png_ptr, info_ptr, freer, mask)
+ mask - which data elements are affected
+ same choices as in png_free_data()
+ freer - one of
+ PNG_DESTROY_WILL_FREE_DATA
+ PNG_SET_WILL_FREE_DATA
+ PNG_USER_WILL_FREE_DATA
+
+For example, to transfer responsibility for some data from a read structure
+to a write structure, you could use
+
+ png_data_freer(read_ptr, read_info_ptr,
+ PNG_USER_WILL_FREE_DATA,
+ PNG_FREE_PLTE|PNG_FREE_tRNS|PNG_FREE_hIST)
+ png_data_freer(write_ptr, write_info_ptr,
+ PNG_DESTROY_WILL_FREE_DATA,
+ PNG_FREE_PLTE|PNG_FREE_tRNS|PNG_FREE_hIST)
+
+thereby briefly reassigning responsibility for freeing to the user but
+immediately afterwards reassigning it once more to the write_destroy
+function. Having done this, it would then be safe to destroy the read
+structure and continue to use the PLTE, tRNS, and hIST data in the write
+structure.
+
+This function only affects data that has already been allocated.
+You can call this function before calling after the png_set_*() functions
+to control whether the user or png_destroy_*() is supposed to free the data.
+When the user assumes responsibility for libpng-allocated data, the
+application must use
+png_free() to free it, and when the user transfers responsibility to libpng
+for data that the user has allocated, the user must have used png_malloc()
+or png_zalloc() to allocate it.
+
+If you allocated text_ptr.text, text_ptr.lang, and text_ptr.translated_keyword
+separately, do not transfer responsibility for freeing text_ptr to libpng,
+because when libpng fills a png_text structure it combines these members with
+the key member, and png_free_data() will free only text_ptr.key. Similarly,
+if you transfer responsibility for free'ing text_ptr from libpng to your
+application, your application must not separately free those members.
For a more compact example of writing a PNG image, see the file example.c.
-
V. Modifying/Customizing libpng:
-There are two issues here. The first is changing how libpng does
+There are three issues here. The first is changing how libpng does
standard things like memory allocation, input/output, and error handling.
The second deals with more complicated things like adding new chunks,
adding new transformations, and generally changing how libpng works.
+Both of those are compile-time issues; that is, they are generally
+determined at the time the code is written, and there is rarely a need
+to provide the user with a means of changing them. The third is a
+run-time issue: choosing between and/or tuning one or more alternate
+versions of computationally intensive routines; specifically, optimized
+assembly-language (and therefore compiler- and platform-dependent)
+versions.
+
+Memory allocation, input/output, and error handling
All of the memory allocation, input/output, and error handling in libpng
-goes through callbacks that are user settable. The default routines are
-in pngmem.c, pngrio.c, pngwio.c, and pngerror.c respectively. To change
-these functions, call the appropriate png_set_???_fn() function.
-
-Memory allocation is done through the functions png_large_malloc(),
-png_malloc(), png_realloc(), png_large_free(), and png_free(). These
-currently just call the standard C functions. The large functions must
-handle exactly 64K, but they don't have to handle more than that. If
+goes through callbacks that are user-settable. The default routines are
+in pngmem.c, pngrio.c, pngwio.c, and pngerror.c, respectively. To change
+these functions, call the appropriate png_set_*_fn() function.
+
+Memory allocation is done through the functions png_malloc()
+and png_free(). These currently just call the standard C functions. If
your pointers can't access more then 64K at a time, you will want to set
MAXSEG_64K in zlib.h. Since it is unlikely that the method of handling
memory allocation on a platform will change between applications, these
-functions must be modified in the library at compile time.
+functions must be modified in the library at compile time. If you prefer
+to use a different method of allocating and freeing data, you can use
+png_create_read_struct_2() or png_create_write_struct_2() to register
+your own functions as described above.
+
+These functions also provide a void pointer that can be retrieved via
+
+ mem_ptr=png_get_mem_ptr(png_ptr);
+
+Your replacement memory functions must have prototypes as follows:
+
+ png_voidp malloc_fn(png_structp png_ptr,
+ png_size_t size);
+ void free_fn(png_structp png_ptr, png_voidp ptr);
+
+Your malloc_fn() should return NULL in case of failure. The png_malloc()
+function will call png_error() if it receives a NULL from the system
+memory allocator or from your replacement malloc_fn().
Input/Output in libpng is done through png_read() and png_write(),
which currently just call fread() and fwrite(). The FILE * is stored in
voidp read_io_ptr = png_get_io_ptr(read_ptr);
voidp write_io_ptr = png_get_io_ptr(write_ptr);
-The replacement I/O functions should have prototypes as follows:
+The replacement I/O functions must have prototypes as follows:
void user_read_data(png_structp png_ptr,
- png_bytep data, png_uint_32 length);
+ png_bytep data, png_size_t length);
void user_write_data(png_structp png_ptr,
- png_bytep data, png_uint_32 length);
+ png_bytep data, png_size_t length);
void user_flush_data(png_structp png_ptr);
Supplying NULL for the read, write, or flush functions sets them back
Error handling in libpng is done through png_error() and png_warning().
Errors handled through png_error() are fatal, meaning that png_error()
should never return to its caller. Currently, this is handled via
-setjmp() and longjmp(), but you could change this to do things like
-exit() if you should wish. On non-fatal errors, png_warning() is called
+setjmp() and longjmp() (unless you have compiled libpng with
+PNG_SETJMP_NOT_SUPPORTED, in which case it is handled via PNG_ABORT()),
+but you could change this to do things like exit() if you should wish.
+
+On non-fatal errors, png_warning() is called
to print a warning message, and then control returns to the calling code.
By default png_error() and png_warning() print a message on stderr via
-fprintf() unless the library is compiled with PNG_NO_STDIO defined. If
-you wish to change the behavior of the error functions, you will need to
-set up your own message callbacks. These functions are normally supplied
-at the time that the png_struct is created. It is also possible to change
-these functions after png_create_???_struct() has been called by calling:
+fprintf() unless the library is compiled with PNG_NO_CONSOLE_IO defined
+(because you don't want the messages) or PNG_NO_STDIO defined (because
+fprintf() isn't available). If you wish to change the behavior of the error
+functions, you will need to set up your own message callbacks. These
+functions are normally supplied at the time that the png_struct is created.
+It is also possible to redirect errors and warnings to your own replacement
+functions after png_create_*_struct() has been called by calling:
png_set_error_fn(png_structp png_ptr,
png_voidp error_ptr, png_error_ptr error_fn,
However, there are some uncertainties about the status of local variables
after a longjmp, so the user may want to be careful about doing anything after
setjmp returns non-zero besides returning itself. Consult your compiler
-documentation for more details.
-
-If you need to read or write custom chunks, you will need to get deeper
-into the libpng code, as a mechanism has not yet been supplied for user
-callbacks with custom chunks. First, read the PNG specification, and have
-a first level of understanding of how it works. Pay particular attention
-to the sections that describe chunk names, and look at how other chunks
-were designed, so you can do things similarly. Second, check out the
-sections of libpng that read and write chunks. Try to find a chunk that
-is similar to yours and copy off of it. More details can be found in the
-comments inside the code. A way of handling unknown chunks in a generic
-method, potentially via callback functions, would be best.
+documentation for more details. For an alternative approach, you may wish
+to use the "cexcept" facility (see http://cexcept.sourceforge.net).
+
+Custom chunks
+
+If you need to read or write custom chunks, you may need to get deeper
+into the libpng code. The library now has mechanisms for storing
+and writing chunks of unknown type; you can even declare callbacks
+for custom chunks. Hoewver, this may not be good enough if the
+library code itself needs to know about interactions between your
+chunk and existing `intrinsic' chunks.
+
+If you need to write a new intrinsic chunk, first read the PNG
+specification. Acquire a first level of
+understanding of how it works. Pay particular attention to the
+sections that describe chunk names, and look at how other chunks were
+designed, so you can do things similarly. Second, check out the
+sections of libpng that read and write chunks. Try to find a chunk
+that is similar to yours and use it as a template. More details can
+be found in the comments inside the code. It is best to handle unknown
+chunks in a generic method, via callback functions, instead of by
+modifying libpng functions.
If you wish to write your own transformation for the data, look through
the part of the code that does the transformations, and check out some of
transformation to the one you want to add and copy off of it. More details
can be found in the comments inside the code itself.
-Configuring for 16 bit platforms:
+Configuring for 16 bit platforms
-You may need to change the png_large_malloc() and png_large_free()
-routines in pngmem.c, as these are required to allocate 64K, although
-there is already support for many of the common DOS compilers. Also,
-you will want to look into zconf.h to tell zlib (and thus libpng) that
+You will want to look into zconf.h to tell zlib (and thus libpng) that
it cannot allocate more then 64K at a time. Even if you can, the memory
won't be accessible. So limit zlib and libpng to 64K by defining MAXSEG_64K.
-Configuring for DOS:
+Configuring for DOS
For DOS users who only have access to the lower 640K, you will
have to limit zlib's memory usage via a png_set_compression_mem_level()
call. See zlib.h or zconf.h in the zlib library for more information.
-Configuring for Medium Model:
+Configuring for Medium Model
Libpng's support for medium model has been tested on most of the popular
compilers. Make sure MAXSEG_64K gets defined, USE_FAR_KEYWORD gets
all set. Everything in the library (except for zlib's structure) is
expecting far data. You must use the typedefs with the p or pp on
the end for pointers (or at least look at them and be careful). Make
-note that the row's of data are defined as png_bytepp, which is an
+note that the rows of data are defined as png_bytepp, which is an
unsigned char far * far *.
Configuring for gui/windowing platforms:
You will need to write new error and warning functions that use the GUI
interface, as described previously, and set them to be the error and
-warning functions at the time that png_create_???_struct() is called,
+warning functions at the time that png_create_*_struct() is called,
in order to have them available during the structure initialization.
They can be changed later via png_set_error_fn(). On some compilers,
you may also have to change the memory allocators (png_malloc, etc.).
Another useful one is to reduce the memory level used by the library.
The memory level defaults to 8, but it can be lowered if you are
short on memory (running DOS, for example, where you only have 640K).
+Note that the memory level does have an effect on compression; among
+other things, lower levels will result in sections of incompressible
+data being emitted in smaller stored blocks, with a correspondingly
+larger relative overhead of up to 15% in the worst case.
png_set_compression_mem_level(png_ptr, level);
png_set_compression_window_bits(png_ptr,
window_bits);
png_set_compression_method(png_ptr, method);
+ png_set_compression_buffer_size(png_ptr, size);
-Controlling row filtering:
+Controlling row filtering
If you want to control whether libpng uses filtering or not, which
filters are used, and how it goes about picking row filters, you
for any images with bit depths less than 8 bits/pixel.
The 'method' parameter sets the main filtering method, which is
-currently only '0' in the PNG 1.0 specification. The 'filters'
+currently only '0' in the PNG 1.2 specification. The 'filters'
parameter sets which filter(s), if any, should be used for each
scanline. Possible values are PNG_ALL_FILTERS and PNG_NO_FILTERS
to turn filtering on and off, respectively.
Individual filter types are PNG_FILTER_NONE, PNG_FILTER_SUB,
PNG_FILTER_UP, PNG_FILTER_AVG, PNG_FILTER_PAETH, which can be bitwise
-ORed together '|' to specify one or more filters to use. These
-filters are described in more detail in the PNG specification. If
-you intend to change the filter type during the course of writing
+ORed together with '|' to specify one or more filters to use.
+These filters are described in more detail in the PNG specification.
+If you intend to change the filter type during the course of writing
the image, you should start with flags set for all of the filters
you intend to use so that libpng can initialize its internal
-structures appropriately for all of the filter types.
+structures appropriately for all of the filter types. (Note that this
+means the first row must always be adaptively filtered, because libpng
+currently does not allocate the filter buffers until png_write_row()
+is called for the first time.)
filters = PNG_FILTER_NONE | PNG_FILTER_SUB
- | PNG_FILTER_UP;
+ PNG_FILTER_UP | PNG_FILTER_AVE |
+ PNG_FILTER_PAETH | PNG_ALL_FILTERS;
+
png_set_filter(png_ptr, PNG_FILTER_TYPE_BASE,
filters);
+ The second parameter can also be
+ PNG_INTRAPIXEL_DIFFERENCING if you are
+ writing a PNG to be embedded in a MNG
+ datastream. This parameter must be the
+ same as the value of filter_method used
+ in png_set_IHDR().
It is also possible to influence how libpng chooses from among the
-available filters. This is done in two ways - by telling it how
-important it is to keep the same filter for successive rows, and
-by telling it the relative computational costs of the filters.
+available filters. This is done in one or both of two ways - by
+telling it how important it is to keep the same filter for successive
+rows, and by telling it the relative computational costs of the filters.
double weights[3] = {1.5, 1.3, 1.1},
costs[PNG_FILTER_VALUE_LAST] =
{1.0, 1.3, 1.3, 1.5, 1.7};
- png_set_filter_selection(png_ptr,
- PNG_FILTER_SELECTION_WEIGHTED, 3,
+ png_set_filter_heuristics(png_ptr,
+ PNG_FILTER_HEURISTIC_WEIGHTED, 3,
weights, costs);
The weights are multiplying factors that indicate to libpng that the
are given only to help explain the function usage. Little testing has
been done to find optimum values for either the costs or the weights.
-Removing unwanted object code:
+Removing unwanted object code
There are a bunch of #define's in pngconf.h that control what parts of
libpng are compiled. All the defines end in _SUPPORTED. If you are
PNG_NO_.
You can also turn all of the transforms and ancillary chunk capabilities
-off en masse with compiler directives that define
+off en masse with compiler directives that define
PNG_NO_READ[or WRITE]_TRANSFORMS, or PNG_NO_READ[or WRITE]_ANCILLARY_CHUNKS,
or all four,
along with directives to turn on any of the capabilities that you do
want. The PNG_NO_READ[or WRITE]_TRANSFORMS directives disable
the extra transformations but still leave the library fully capable of reading
-and writing PNG files with all known public chunks [except for sPLT].
+and writing PNG files with all known public chunks
Use of the PNG_NO_READ[or WRITE]_ANCILLARY_CHUNKS directive
produces a library that is incapable of reading or writing ancillary chunks.
If you are not using the progressive reading capability, you can
The size of the library itself should not be an issue, because only
those sections that are actually used will be loaded into memory.
-Requesting debug printout:
+Requesting debug printout
The macro definition PNG_DEBUG can be used to request debugging
printout. Set it to an integer value in the range 0 to 3. Higher
having level = 0 will be printed. There aren't any such statements in
this version of libpng, but if you insert some they will be printed.
-VI. Changes to Libpng from version 0.88
+VI. Runtime optimization
+
+A new feature in libpng 1.2.0 is the ability to dynamically switch between
+standard and optimized versions of some routines. Currently these are
+limited to three computationally intensive tasks when reading PNG files:
+decoding row filters, expanding interlacing, and combining interlaced or
+transparent row data with previous row data. Currently the optimized
+versions are available only for x86 (Intel, AMD, etc.) platforms with
+MMX support, though this may change in future versions. (For example,
+the non-MMX assembler optimizations for zlib might become similarly
+runtime-selectable in future releases, in which case libpng could be
+extended to support them. Alternatively, the compile-time choice of
+floating-point versus integer routines for gamma correction might become
+runtime-selectable.)
+
+Because such optimizations tend to be very platform- and compiler-dependent,
+both in how they are written and in how they perform, the new runtime code
+in libpng has been written to allow programs to query, enable, and disable
+either specific optimizations or all such optimizations. For example, to
+enable all possible optimizations (bearing in mind that some "optimizations"
+may actually run more slowly in rare cases):
+
+ #if defined(PNG_LIBPNG_VER) && (PNG_LIBPNG_VER >= 10200)
+ png_uint_32 mask, flags;
+
+ flags = png_get_asm_flags(png_ptr);
+ mask = png_get_asm_flagmask(PNG_SELECT_READ | PNG_SELECT_WRITE);
+ png_set_asm_flags(png_ptr, flags | mask);
+ #endif
+
+To enable only optimizations relevant to reading PNGs, use PNG_SELECT_READ
+by itself when calling png_get_asm_flagmask(); similarly for optimizing
+only writing. To disable all optimizations:
+
+ #if defined(PNG_LIBPNG_VER) && (PNG_LIBPNG_VER >= 10200)
+ flags = png_get_asm_flags(png_ptr);
+ mask = png_get_asm_flagmask(PNG_SELECT_READ | PNG_SELECT_WRITE);
+ png_set_asm_flags(png_ptr, flags & ~mask);
+ #endif
+
+To enable or disable only MMX-related features, use png_get_mmx_flagmask()
+in place of png_get_asm_flagmask(). The mmx version takes one additional
+parameter:
+
+ #if defined(PNG_LIBPNG_VER) && (PNG_LIBPNG_VER >= 10200)
+ int selection = PNG_SELECT_READ | PNG_SELECT_WRITE;
+ int compilerID;
+
+ mask = png_get_mmx_flagmask(selection, &compilerID);
+ #endif
+
+On return, compilerID will indicate which version of the MMX assembler
+optimizations was compiled. Currently two flavors exist: Microsoft
+Visual C++ (compilerID == 1) and GNU C (a.k.a. gcc/gas, compilerID == 2).
+On non-x86 platforms or on systems compiled without MMX optimizations, a
+value of -1 is used.
+
+Note that both png_get_asm_flagmask() and png_get_mmx_flagmask() return
+all valid, settable optimization bits for the version of the library that's
+currently in use. In the case of shared (dynamically linked) libraries,
+this may include optimizations that did not exist at the time the code was
+written and compiled. It is also possible, of course, to enable only known,
+specific optimizations; for example:
+
+ #if defined(PNG_LIBPNG_VER) && (PNG_LIBPNG_VER >= 10200)
+ flags = PNG_ASM_FLAG_MMX_READ_COMBINE_ROW \
+ | PNG_ASM_FLAG_MMX_READ_INTERLACE \
+ | PNG_ASM_FLAG_MMX_READ_FILTER_SUB \
+ | PNG_ASM_FLAG_MMX_READ_FILTER_UP \
+ | PNG_ASM_FLAG_MMX_READ_FILTER_AVG \
+ | PNG_ASM_FLAG_MMX_READ_FILTER_PAETH ;
+ png_set_asm_flags(png_ptr, flags);
+ #endif
+
+This method would enable only the MMX read-optimizations available at the
+time of libpng 1.2.0's release, regardless of whether a later version of
+the DLL were actually being used. (Also note that these functions did not
+exist in versions older than 1.2.0, so any attempt to run a dynamically
+linked app on such an older version would fail.)
+
+To determine whether the processor supports MMX instructions at all, use
+the png_mmx_support() function:
+
+ #if defined(PNG_LIBPNG_VER) && (PNG_LIBPNG_VER >= 10200)
+ mmxsupport = png_mmx_support();
+ #endif
+
+It returns -1 if MMX support is not compiled into libpng, 0 if MMX code
+is compiled but MMX is not supported by the processor, or 1 if MMX support
+is fully available. Note that png_mmx_support(), png_get_mmx_flagmask(),
+and png_get_asm_flagmask() all may be called without allocating and ini-
+tializing any PNG structures (for example, as part of a usage screen or
+"about" box).
+
+The following code can be used to prevent an application from using the
+thread_unsafe features, even if libpng was built with PNG_THREAD_UNSAFE_OK
+defined:
+
+#if defined(PNG_USE_PNGGCCRD) && defined(PNG_ASSEMBLER_CODE_SUPPORTED) \
+ && defined(PNG_THREAD_UNSAFE_OK)
+ /* Disable thread-unsafe features of pnggccrd */
+ if (png_access_version() >= 10200)
+ {
+ png_uint_32 mmx_disable_mask = 0;
+ png_uint_32 asm_flags;
+
+ mmx_disable_mask |= ( PNG_ASM_FLAG_MMX_READ_COMBINE_ROW \
+ | PNG_ASM_FLAG_MMX_READ_FILTER_SUB \
+ | PNG_ASM_FLAG_MMX_READ_FILTER_AVG \
+ | PNG_ASM_FLAG_MMX_READ_FILTER_PAETH );
+ asm_flags = png_get_asm_flags(png_ptr);
+ png_set_asm_flags(png_ptr, asm_flags & ~mmx_disable_mask);
+ }
+#endif
+
+For more extensive examples of runtime querying, enabling and disabling
+of optimized features, see contrib/gregbook/readpng2.c in the libpng
+source-code distribution.
+
+
+VII. MNG support
+
+The MNG specification (available at http://www.libpng.org/pub/mng) allows
+certain extensions to PNG for PNG images that are embedded in MNG datastreams.
+Libpng can support some of these extensions. To enable them, use the
+png_permit_mng_features() function:
+
+ feature_set = png_permit_mng_features(png_ptr, mask)
+ mask is a png_uint_32 containing the logical OR of the
+ features you want to enable. These include
+ PNG_FLAG_MNG_EMPTY_PLTE
+ PNG_FLAG_MNG_FILTER_64
+ PNG_ALL_MNG_FEATURES
+ feature_set is a png_32_uint that is the logical AND of
+ your mask with the set of MNG features that is
+ supported by the version of libpng that you are using.
+
+It is an error to use this function when reading or writing a standalone
+PNG file with the PNG 8-byte signature. The PNG datastream must be wrapped
+in a MNG datastream. As a minimum, it must have the MNG 8-byte signature
+and the MHDR and MEND chunks. Libpng does not provide support for these
+or any other MNG chunks; your application must provide its own support for
+them. You may wish to consider using libmng (available at
+http://www.libmng.com) instead.
+
+VIII. Changes to Libpng from version 0.88
It should be noted that versions of libpng later than 0.96 are not
distributed by the original libpng author, Guy Schalnat, nor by
still alive and well, but they have moved on to other things.
The old libpng functions png_read_init(), png_write_init(),
-png_info_init(), png_read_destroy(), and png_write_destory() have been
-moved to PNG_INTERNAL in version 0.95 to discourage their use. The
-preferred method of creating and initializing the libpng structures is
+png_info_init(), png_read_destroy(), and png_write_destroy() have been
+moved to PNG_INTERNAL in version 0.95 to discourage their use. These
+functions will be removed from libpng version 2.0.0.
+
+The preferred method of creating and initializing the libpng structures is
via the png_create_read_struct(), png_create_write_struct(), and
png_create_info_struct() because they isolate the size of the structures
from the application, allow version error checking, and also allow the
because this caused applications that do not use custom error functions
to fail if the png_ptr was not initialized to zero. It is still possible
to set the error callbacks AFTER png_read_init(), or to change them with
-png_set_error_fn(), which is essentially the same function, but with a
-new name to force compilation errors with applications that try to use
-the old method.
+png_set_error_fn(), which is essentially the same function, but with a new
+name to force compilation errors with applications that try to use the old
+method.
+
+Starting with version 1.0.7, you can find out which version of the library
+you are using at run-time:
+
+ png_uint_32 libpng_vn = png_access_version_number();
-VII. Y2K Compliance in libpng
+The number libpng_vn is constructed from the major version, minor
+version with leading zero, and release number with leading zero,
+(e.g., libpng_vn for version 1.0.7 is 10007).
-January 13, 1999
+You can also check which version of png.h you used when compiling your
+application:
+
+ png_uint_32 application_vn = PNG_LIBPNG_VER;
+
+IX. Y2K Compliance in libpng
+
+July 8, 2002
Since the PNG Development group is an ad-hoc body, we can't make
an official declaration.
-This is your unofficial assurance that libpng from version 0.81 and
-upward are Y2K compliant. It is my belief that earlier versions were
-also Y2K compliant.
+This is your unofficial assurance that libpng from version 0.71 and
+upward through 1.2.4 are Y2K compliant. It is my belief that earlier
+versions were also Y2K compliant.
Libpng only has three year fields. One is a 2-byte unsigned integer that
will hold years up to 65535. The other two hold the date in text
There are seven time-related functions:
- png_convert_to_rfc_1123() in png.c
+ png_convert_to_rfc_1123() in png.c
(formerly png_convert_to_rfc_1152() in error)
- png_convert_from_struct_tm() in pngwrite.c, called in pngwrite.c
+ png_convert_from_struct_tm() in pngwrite.c, called
+ in pngwrite.c
png_convert_from_time_t() in pngwrite.c
png_get_tIME() in pngget.c
png_handle_tIME() in pngrutil.c, called in pngread.c
png_set_tIME() in pngset.c
png_write_tIME() in pngwutil.c, called in pngwrite.c
-All appear to handle dates properly in a Y2K environment. The
+All appear to handle dates properly in a Y2K environment. The
png_convert_from_time_t() function calls gmtime() to convert from system
clock time, which returns (year - 1900), which we properly convert to
the full 4-digit year. There is a possibility that applications using
libpng are not passing 4-digit years into the png_convert_to_rfc_1123()
-function, or incorrectly passing only a 2-digit year instead of
-"year - 1900" into the png_convert_from_struct_tm() function, but this
-is not under our control. The libpng documentation has always stated
-that it works with 4-digit years, and the APIs have been documented as
-such.
+function, or that they are incorrectly passing only a 2-digit year
+instead of "year - 1900" into the png_convert_from_struct_tm() function,
+but this is not under our control. The libpng documentation has always
+stated that it works with 4-digit years, and the APIs have been
+documented as such.
The tIME chunk itself is also Y2K compliant. It uses a 2-byte unsigned
integer to hold the year, and can hold years as large as 65535.
+zlib, upon which libpng depends, is also Y2K compliant. It contains
+no date-related code.
+
Glenn Randers-Pehrson
libpng maintainer
-.TH LIBPNGPF 3 "January 14, 1999"
+.TH LIBPNGPF 3 "July 8, 2002"
.SH NAME
-libpng \- Portable Network Graphics (PNG) Reference Library 1.0.3 - January 14, 1999
+libpng \- Portable Network Graphics (PNG) Reference Library 1.2.4
(private functions)
.SH SYNOPSIS
-#include <png.h>
+\fB#include <png.h>\fP
-void png_build_gamma_table (png_structp png_ptr);
+\fI\fB
-void png_build_grayscale_palette (int bit_depth, png_colorp
-palette);
+\fBvoid png_build_gamma_table (png_structp \fIpng_ptr\fP\fB);\fP
-void png_calculate_crc (png_structp png_ptr, png_bytep ptr,
-png_size_t length);
-void png_check_chunk_name (png_structp png_ptr, png_bytep
-chunk_name);
+\fI\fB
-png_size_t png_check_keyword (png_structp png_ptr, png_charp
-key, png_charpp new_key);
+\fBvoid png_build_grayscale_palette (int \fP\fIbit_depth\fP\fB, png_colorp \fIpalette\fP\fB);\fP
-void png_combine_row (png_structp png_ptr, png_bytep row, int
-mask);
+\fI\fB
-void png_correct_palette (png_structp png_ptr, png_colorp
-palette, int num_palette);
+\fBvoid png_calculate_crc (png_structp \fP\fIpng_ptr\fP\fB, png_bytep \fP\fIptr\fP\fB, png_size_t \fIlength\fP\fB);\fP
-int png_crc_error (png_structp png_ptr);
+\fI\fB
-int png_crc_finish (png_structp png_ptr, png_uint_32 skip);
+\fBvoid png_check_chunk_name (png_structp \fP\fIpng_ptr\fP\fB, png_bytep \fIchunk_name\fP\fB);\fP
-void png_crc_read (png_structp png_ptr, png_bytep buf,
-png_size_t length);
+\fI\fB
-png_voidp png_create_struct (int type, png_malloc_ptr malloc_fn);
+\fBpng_size_t png_check_keyword (png_structp \fP\fIpng_ptr\fP\fB, png_charp \fP\fIkey\fP\fB, png_charpp \fInew_key\fP\fB);\fP
-png_voidp png_create_struct_2 (int type);
+\fI\fB
-void png_destroy_struct (png_voidp struct_ptr);
+\fBvoid png_combine_row (png_structp \fP\fIpng_ptr\fP\fB, png_bytep \fP\fIrow\fP\fB, int \fImask\fP\fB);\fP
-void png_destroy_struct_2 (png_voidp struct_ptr, png_free_ptr
-free_fn);
+\fI\fB
-void png_do_background (png_row_infop row_info, png_bytep row,
-png_color_16p trans_values, png_color_16p background,
-png_color_16p background_1, png_bytep gamma_table, png_bytep
-gamma_from_1, png_bytep gamma_to_1, png_uint_16pp gamma_16,
-png_uint_16pp gamma_16_from_1, png_uint_16pp gamma_16_to_1, int
-gamma_shift);
+\fBvoid png_correct_palette (png_structp \fP\fIpng_ptr\fP\fB, png_colorp \fP\fIpalette\fP\fB, int \fInum_palette\fP\fB);\fP
-void png_do_bgr (png_row_infop row_info, png_bytep row);
+\fI\fB
-void png_do_chop (png_row_infop row_info, png_bytep row);
+\fBint png_crc_error (png_structp \fIpng_ptr\fP\fB);\fP
-void png_do_dither (png_row_infop row_info, png_bytep row,
-png_bytep palette_lookup, png_bytep dither_lookup);
+\fI\fB
-void png_do_expand (png_row_infop row_info, png_bytep row,
-png_color_16p trans_value);
+\fBint png_crc_finish (png_structp \fP\fIpng_ptr\fP\fB, png_uint_32 \fIskip\fP\fB);\fP
-void png_do_expand_palette (png_row_infop row_info, png_bytep
-row, png_colorp palette, png_bytep trans, int num_trans);
+\fI\fB
-void png_do_gamma (png_row_infop row_info, png_bytep row,
-png_bytep gamma_table, png_uint_16pp gamma_16_table, int
-gamma_shift);
+\fBvoid png_crc_read (png_structp \fP\fIpng_ptr\fP\fB, png_bytep \fP\fIbuf\fP\fB, png_size_t \fIlength\fP\fB);\fP
-void png_do_gray_to_rgb (png_row_infop row_info, png_bytep
-row);
+\fI\fB
-void png_do_invert (png_row_infop row_info, png_bytep row);
+\fBpng_voidp png_create_struct (int \fItype\fP\fB);\fP
-void png_do_pack (png_row_infop row_info, png_bytep row,
-png_uint_32 bit_depth);
+\fI\fB
-void png_do_packswap (png_row_infop row_info, png_bytep row);
+\fBpng_voidp png_create_struct_2 (int \fP\fItype\fP\fB, png_malloc_ptr \fP\fImalloc_fn\fP\fB, png_voidp \fImem_ptr\fP\fB);\fP
-void png_do_read_filler (png_row_infop row_info, png_bytep row,
-png_uint_32 filler, png_uint_32 flags);
+\fI\fB
-void png_do_read_interlace (png_row_infop row_info, png_bytep
-row, int pass, png_uint_32 transformations);
+\fBpng_charp png_decompress_chunk (png_structp \fP\fIpng_ptr\fP\fB, int \fP\fIcomp_type\fP\fB, png_charp \fP\fIchunkdata\fP\fB, png_size_t \fP\fIchunklength\fP\fB, png_size_t \fP\fIprefix_length\fP\fB, png_size_t \fI*data_length\fP\fB);\fP
-void png_do_read_invert_alpha (png_row_infop row_info,
-png_bytep row);
+\fI\fB
-void png_do_read_swap_alpha (png_row_infop row_info, png_bytep
-row);
+\fBvoid png_destroy_struct (png_voidp \fIstruct_ptr\fP\fB);\fP
-void png_do_read_transformations (png_structp png_ptr);
+\fI\fB
-int png_do_rgb_to_gray (png_row_infop row_info, png_bytep
-row);
+\fBvoid png_destroy_struct_2 (png_voidp \fP\fIstruct_ptr\fP\fB, png_free_ptr \fP\fIfree_fn\fP\fB, png_voidp \fImem_ptr\fP\fB);\fP
-void png_do_shift (png_row_infop row_info, png_bytep row,
-png_color_8p bit_depth);
+\fI\fB
-void png_do_strip_filler (png_row_infop row_info, png_bytep
-row, png_uint_32 flags);
+\fBvoid png_do_background (png_row_infop \fP\fIrow_info\fP\fB, png_bytep \fP\fIrow\fP\fB, png_color_16p \fP\fItrans_values\fP\fB, png_color_16p \fP\fIbackground\fP\fB, png_color_16p \fP\fIbackground_1\fP\fB, png_bytep \fP\fIgamma_table\fP\fB, png_bytep \fP\fIgamma_from_1\fP\fB, png_bytep \fP\fIgamma_to_1\fP\fB, png_uint_16pp \fP\fIgamma_16\fP\fB, png_uint_16pp \fP\fIgamma_16_from_1\fP\fB, png_uint_16pp \fP\fIgamma_16_to_1\fP\fB, int \fIgamma_shift\fP\fB);\fP
-void png_do_swap (png_row_infop row_info, png_bytep row);
+\fI\fB
-void png_do_unpack (png_row_infop row_info, png_bytep row);
+\fBvoid png_do_bgr (png_row_infop \fP\fIrow_info\fP\fB, png_bytep \fIrow\fP\fB);\fP
-void png_do_unshift (png_row_infop row_info, png_bytep row,
-png_color_8p sig_bits);
+\fI\fB
-void png_do_write_interlace (png_row_infop row_info, png_bytep
-row, int pass);
+\fBvoid png_do_chop (png_row_infop \fP\fIrow_info\fP\fB, png_bytep \fIrow\fP\fB);\fP
-void png_do_write_invert_alpha (png_row_infop row_info,
-png_bytep row);
+\fI\fB
-void png_do_write_swap_alpha (png_row_infop row_info, png_bytep
-row);
+\fBvoid png_do_dither (png_row_infop \fP\fIrow_info\fP\fB, png_bytep \fP\fIrow\fP\fB, png_bytep \fP\fIpalette_lookup\fP\fB, png_bytep \fIdither_lookup\fP\fB);\fP
-void png_do_write_transformations (png_structp png_ptr);
+\fI\fB
-void *png_far_to_near (png_structp png_ptr,png_voidp ptr,
-int check);
+\fBvoid png_do_expand (png_row_infop \fP\fIrow_info\fP\fB, png_bytep \fP\fIrow\fP\fB, png_color_16p \fItrans_value\fP\fB);\fP
-void png_flush (png_structp png_ptr);
+\fI\fB
-png_int_32 png_get_int_32 (png_bytep buf);
+\fBvoid png_do_expand_palette (png_row_infop \fP\fIrow_info\fP\fB, png_bytep \fP\fIrow\fP\fB, png_colorp \fP\fIpalette\fP\fB, png_bytep \fP\fItrans\fP\fB, int \fInum_trans\fP\fB);\fP
-png_uint_16 png_get_uint_16 (png_bytep buf);
+\fI\fB
-png_uint_32 png_get_uint_32 (png_bytep buf);
+\fBvoid png_do_gamma (png_row_infop \fP\fIrow_info\fP\fB, png_bytep \fP\fIrow\fP\fB, png_bytep \fP\fIgamma_table\fP\fB, png_uint_16pp \fP\fIgamma_16_table\fP\fB, int \fIgamma_shift\fP\fB);\fP
-void png_handle_bKGD (png_structp png_ptr, png_infop info_ptr,
-png_uint_32 length);
+\fI\fB
-void png_handle_cHRM (png_structp png_ptr, png_infop info_ptr,
-png_uint_32 length);
+\fBvoid png_do_gray_to_rgb (png_row_infop \fP\fIrow_info\fP\fB, png_bytep \fIrow\fP\fB);\fP
-void png_handle_gAMA (png_structp png_ptr, png_infop info_ptr,
-png_uint_32 length);
+\fI\fB
-void png_handle_hIST (png_structp png_ptr, png_infop info_ptr,
-png_uint_32 length);
+\fBvoid png_do_invert (png_row_infop \fP\fIrow_info\fP\fB, png_bytep \fIrow\fP\fB);\fP
-void png_handle_IEND (png_structp png_ptr, png_infop info_ptr,
-png_uint_32 length);
+\fI\fB
-void png_handle_IHDR (png_structp png_ptr, png_infop info_ptr,
-png_uint_32 length);
+\fBvoid png_do_pack (png_row_infop \fP\fIrow_info\fP\fB, png_bytep \fP\fIrow\fP\fB, png_uint_32 \fIbit_depth\fP\fB);\fP
-void png_handle_oFFs (png_structp png_ptr, png_infop info_ptr,
-png_uint_32 length);
+\fI\fB
-void png_handle_pCAL (png_structp png_ptr, png_infop info_ptr,
-png_uint_32 length);
+\fBvoid png_do_packswap (png_row_infop \fP\fIrow_info\fP\fB, png_bytep \fIrow\fP\fB);\fP
-void png_handle_pHYs (png_structp png_ptr, png_infop info_ptr,
-png_uint_32 length);
+\fI\fB
-void png_handle_PLTE (png_structp png_ptr, png_infop info_ptr,
-png_uint_32 length);
+\fBvoid png_do_read_filler (png_row_infop \fP\fIrow_info\fP\fB, png_bytep \fP\fIrow\fP\fB, png_uint_32 \fP\fIfiller\fP\fB, png_uint_32 \fIflags\fP\fB);\fP
-void png_handle_sBIT (png_structp png_ptr, png_infop info_ptr,
-png_uint_32 length);
+\fI\fB
-void png_handle_sRGB (png_structp png_ptr, png_infop info_ptr,
-png_uint_32 length);
+\fBvoid png_do_read_interlace (png_row_infop \fP\fIrow_info\fP\fB, png_bytep \fP\fIrow\fP\fB, int \fP\fIpass\fP\fB, png_uint_32 \fItransformations\fP\fB);\fP
-void png_handle_tEXt (png_structp png_ptr, png_infop info_ptr,
-png_uint_32 length);
+\fI\fB
-void png_handle_tIME (png_structp png_ptr, png_infop info_ptr,
-png_uint_32 length);
+\fBvoid png_do_read_invert_alpha (png_row_infop \fP\fIrow_info\fP\fB, png_bytep \fIrow\fP\fB);\fP
-void png_handle_tRNS (png_structp png_ptr, png_infop info_ptr,
-png_uint_32 length);
+\fI\fB
-void png_handle_unknown (png_structp png_ptr, png_infop
-info_ptr, png_uint_32 length);
+\fBvoid png_do_read_swap_alpha (png_row_infop \fP\fIrow_info\fP\fB, png_bytep \fIrow\fP\fB);\fP
-void png_handle_zTXt (png_structp png_ptr, png_infop info_ptr,
-png_uint_32 length);
+\fI\fB
-void png_info_destroy (png_structp png_ptr, png_infop
-info_ptr);
+\fBvoid png_do_read_transformations (png_structp \fIpng_ptr\fP\fB);\fP
-void png_init_read_transformations (png_structp png_ptr);
+\fI\fB
-void png_process_IDAT_data (png_structp png_ptr, png_bytep
-buffer, png_size_t buffer_length);
+\fBint png_do_rgb_to_gray (png_row_infop \fP\fIrow_info\fP\fB, png_bytep \fIrow\fP\fB);\fP
-void png_process_some_data (png_structp png_ptr, png_infop
-info_ptr);
+\fI\fB
-void png_push_check_crc (png_structp png_ptr);
+\fBvoid png_do_shift (png_row_infop \fP\fIrow_info\fP\fB, png_bytep \fP\fIrow\fP\fB, png_color_8p \fIbit_depth\fP\fB);\fP
-void png_push_crc_finish (png_structp png_ptr);
+\fI\fB
-void png_push_crc_skip (png_structp png_ptr, png_uint_32
-length);
+\fBvoid png_do_strip_filler (png_row_infop \fP\fIrow_info\fP\fB, png_bytep \fP\fIrow\fP\fB, png_uint_32 \fIflags\fP\fB);\fP
-void png_push_fill_buffer (png_structp png_ptr, png_bytep
-buffer, png_size_t length);
+\fI\fB
-void png_push_handle_tEXt (png_structp png_ptr, png_infop
-info_ptr, png_uint_32 length);
+\fBvoid png_do_swap (png_row_infop \fP\fIrow_info\fP\fB, png_bytep \fIrow\fP\fB);\fP
-void png_push_handle_unknown (png_structp png_ptr, png_infop
-info_ptr, png_uint_32 length);
+\fI\fB
-void png_push_handle_zTXt (png_structp png_ptr, png_infop
-info_ptr, png_uint_32 length);
+\fBvoid png_do_unpack (png_row_infop \fP\fIrow_info\fP\fB, png_bytep \fIrow\fP\fB);\fP
-void png_push_have_end (png_structp png_ptr, png_infop
-info_ptr);
+\fI\fB
-void png_push_have_info (png_structp png_ptr, png_infop
-info_ptr);
+\fBvoid png_do_unshift (png_row_infop \fP\fIrow_info\fP\fB, png_bytep \fP\fIrow\fP\fB, png_color_8p \fIsig_bits\fP\fB);\fP
-void png_push_have_row (png_structp png_ptr, png_bytep row);
+\fI\fB
-void png_push_process_row (png_structp png_ptr);
+\fBvoid png_do_write_interlace (png_row_infop \fP\fIrow_info\fP\fB, png_bytep \fP\fIrow\fP\fB, int \fIpass\fP\fB);\fP
-void png_push_read_chunk (png_structp png_ptr, png_infop
-info_ptr);
+\fI\fB
-void png_push_read_end (png_structp png_ptr, png_infop
-info_ptr);
+\fBvoid png_do_write_invert_alpha (png_row_infop \fP\fIrow_info\fP\fB, png_bytep \fIrow\fP\fB);\fP
-void png_push_read_IDAT (png_structp png_ptr);
+\fI\fB
-void png_push_read_sig (png_structp png_ptr, png_infop
-info_ptr);
+\fBvoid png_do_write_swap_alpha (png_row_infop \fP\fIrow_info\fP\fB, png_bytep \fIrow\fP\fB);\fP
-void png_push_read_tEXt (png_structp png_ptr, png_infop
-info_ptr);
+\fI\fB
-void png_push_read_zTXt (png_structp png_ptr, png_infop
-info_ptr);
+\fBvoid png_do_write_transformations (png_structp \fIpng_ptr\fP\fB);\fP
-void png_push_restore_buffer (png_structp png_ptr, png_bytep
-buffer, png_size_t buffer_length);
+\fI\fB
-void png_push_save_buffer (png_structp png_ptr);
+\fBvoid *png_far_to_near (png_structp png_ptr,png_voidp \fP\fIptr\fP\fB, int \fIcheck\fP\fB);\fP
-void png_read_data (png_structp png_ptr, png_bytep data,
-png_size_t length);
+\fI\fB
-void png_read_filter_row (png_structp png_ptr, png_row_infop
-row_info, png_bytep row, png_bytep prev_row, int filter);
+\fBvoid png_flush (png_structp \fIpng_ptr\fP\fB);\fP
-void png_read_finish_row (png_structp png_ptr);
+\fI\fB
-void png_read_init (png_structp png_ptr);
+\fBpng_int_32 png_get_int_32 (png_bytep \fIbuf\fP\fB);\fP
-void png_read_push_finish_row (png_structp png_ptr);
+\fI\fB
-void png_read_start_row (png_structp png_ptr);
+\fBpng_uint_16 png_get_uint_16 (png_bytep \fIbuf\fP\fB);\fP
-void png_read_transform_info (png_structp png_ptr, png_infop
-info_ptr);
+\fI\fB
-void png_reset_crc (png_structp png_ptr);
+\fBpng_uint_32 png_get_uint_32 (png_bytep \fIbuf\fP\fB);\fP
-void png_save_int_32 (png_bytep buf, png_int_32 i);
+\fI\fB
-void png_save_uint_16 (png_bytep buf, unsigned int i);
+\fBvoid png_handle_bKGD (png_structp \fP\fIpng_ptr\fP\fB, png_infop \fP\fIinfo_ptr\fP\fB, png_uint_32 \fIlength\fP\fB);\fP
-void png_save_uint_32 (png_bytep buf, png_uint_32 i);
+\fI\fB
-void png_write_bKGD (png_structp png_ptr, png_color_16p values,
-int color_type);
+\fBvoid png_handle_cHRM (png_structp \fP\fIpng_ptr\fP\fB, png_infop \fP\fIinfo_ptr\fP\fB, png_uint_32 \fIlength\fP\fB);\fP
-void png_write_cHRM (png_structp png_ptr, double white_x,
-double white_y, double red_x, double red_y, double green_x,
-double green_y, double blue_x, double blue_y);
+\fI\fB
-void png_write_data (png_structp png_ptr, png_bytep data,
-png_size_t length);
-void png_write_filtered_row (png_structp png_ptr, png_bytep
-filtered_row);
+\fBvoid png_handle_gAMA (png_structp \fP\fIpng_ptr\fP\fB, png_infop \fP\fIinfo_ptr\fP\fB, png_uint_32 \fIlength\fP\fB);\fP
-void png_write_find_filter (png_structp png_ptr, png_row_infop
-row_info);
+\fI\fB
-void png_write_finish_row (png_structp png_ptr);
+\fBvoid png_handle_hIST (png_structp \fP\fIpng_ptr\fP\fB, png_infop \fP\fIinfo_ptr\fP\fB, png_uint_32 \fIlength\fP\fB);\fP
-void png_write_gAMA (png_structp png_ptr, double file_gamma);
+\fI\fB
-void png_write_hIST (png_structp png_ptr, png_uint_16p hist,
-int num_hist);
+\fBvoid png_handle_IEND (png_structp \fP\fIpng_ptr\fP\fB, png_infop \fP\fIinfo_ptr\fP\fB, png_uint_32 \fIlength\fP\fB);\fP
-void png_write_init (png_structp png_ptr);
+\fI\fB
-void png_write_IDAT (png_structp png_ptr, png_bytep data,
-png_size_t length);
+\fBvoid png_handle_IHDR (png_structp \fP\fIpng_ptr\fP\fB, png_infop \fP\fIinfo_ptr\fP\fB, png_uint_32 \fIlength\fP\fB);\fP
-void png_write_IEND (png_structp png_ptr);
+\fI\fB
-void png_write_IHDR (png_structp png_ptr, png_uint_32 width,
-png_uint_32 height, int bit_depth, int color_type, int
-compression_type, int filter_type, int interlace_type);
+\fBvoid png_handle_iCCP (png_structp \fP\fIpng_ptr\fP\fB, png_infop \fP\fIinfo_ptr\fP\fB, png_uint_32 \fIlength\fP\fB);\fP
-void png_write_oFFs (png_structp png_ptr, png_uint_32 x_offset,
-png_uint_32 y_offset, int unit_type);
+\fI\fB
-void png_write_pCAL (png_structp png_ptr, png_charp purpose,
-png_int_32 X0, png_int_32 X1, int type, int nparams, png_charp
-units, png_charpp params);
+\fBvoid png_handle_iTXt (png_structp \fP\fIpng_ptr\fP\fB, png_infop \fP\fIinfo_ptr\fP\fB, png_uint_32 \fIlength\fP\fB);\fP
-void png_write_pHYs (png_structp png_ptr, png_uint_32
-x_pixels_per_unit, png_uint_32 y_pixels_per_unit, int
-unit_type);
+\fI\fB
-void png_write_PLTE (png_structp png_ptr, png_colorp palette,
-png_uint_32 num_pal);
+\fBvoid png_handle_oFFs (png_structp \fP\fIpng_ptr\fP\fB, png_infop \fP\fIinfo_ptr\fP\fB, png_uint_32 \fIlength\fP\fB);\fP
-void png_write_sBIT (png_structp png_ptr, png_color_8p sbit,
-int color_type);
+\fI\fB
-void png_write_sig (png_structp png_ptr);
+\fBvoid png_handle_pCAL (png_structp \fP\fIpng_ptr\fP\fB, png_infop \fP\fIinfo_ptr\fP\fB, png_uint_32 \fIlength\fP\fB);\fP
-void png_write_sRGB (png_structp png_ptr, int intent);
+\fI\fB
-void png_write_start_row (png_structp png_ptr);
+\fBvoid png_handle_pHYs (png_structp \fP\fIpng_ptr\fP\fB, png_infop \fP\fIinfo_ptr\fP\fB, png_uint_32 \fIlength\fP\fB);\fP
-void png_write_tEXt (png_structp png_ptr, png_charp key,
-png_charp text, png_size_t text_len);
+\fI\fB
-void png_write_tIME (png_structp png_ptr, png_timep mod_time);
+\fBvoid png_handle_PLTE (png_structp \fP\fIpng_ptr\fP\fB, png_infop \fP\fIinfo_ptr\fP\fB, png_uint_32 \fIlength\fP\fB);\fP
-void png_write_tRNS (png_structp png_ptr, png_bytep trans,
-png_color_16p values, int number, int color_type);
+\fI\fB
-void png_write_zTXt (png_structp png_ptr, png_charp key,
-png_charp text, png_size_t text_len, int compression);
+\fBvoid png_handle_sBIT (png_structp \fP\fIpng_ptr\fP\fB, png_infop \fP\fIinfo_ptr\fP\fB, png_uint_32 \fIlength\fP\fB);\fP
-voidpf png_zalloc (voidpf png_ptr, uInt items, uInt size);
+\fI\fB
-void png_zfree (voidpf png_ptr, voidpf ptr);
+\fBvoid png_handle_sCAL (png_structp \fP\fIpng_ptr\fP\fB, png_infop \fP\fIinfo_ptr\fP\fB, png_uint_32 \fIlength\fP\fB);\fP
+
+\fI\fB
+
+\fBvoid png_handle_sPLT (png_structp \fP\fIpng_ptr\fP\fB, png_infop \fP\fIinfo_ptr\fP\fB, png_uint_32 \fIlength\fP\fB);\fP
+
+\fI\fB
+
+\fBvoid png_handle_sRGB (png_structp \fP\fIpng_ptr\fP\fB, png_infop \fP\fIinfo_ptr\fP\fB, png_uint_32 \fIlength\fP\fB);\fP
+
+\fI\fB
+
+\fBvoid png_handle_tEXt (png_structp \fP\fIpng_ptr\fP\fB, png_infop \fP\fIinfo_ptr\fP\fB, png_uint_32 \fIlength\fP\fB);\fP
+
+\fI\fB
+
+\fBvoid png_handle_tIME (png_structp \fP\fIpng_ptr\fP\fB, png_infop \fP\fIinfo_ptr\fP\fB, png_uint_32 \fIlength\fP\fB);\fP
+
+\fI\fB
+
+\fBvoid png_handle_tRNS (png_structp \fP\fIpng_ptr\fP\fB, png_infop \fP\fIinfo_ptr\fP\fB, png_uint_32 \fIlength\fP\fB);\fP
+
+\fI\fB
+
+\fBvoid png_handle_unknown (png_structp \fP\fIpng_ptr\fP\fB, png_infop \fP\fIinfo_ptr\fP\fB, png_uint_32 \fIlength\fP\fB);\fP
+
+\fI\fB
+
+\fBvoid png_handle_zTXt (png_structp \fP\fIpng_ptr\fP\fB, png_infop \fP\fIinfo_ptr\fP\fB, png_uint_32 \fIlength\fP\fB);\fP
+
+\fI\fB
+
+\fBvoid png_info_destroy (png_structp \fP\fIpng_ptr\fP\fB, png_infop \fIinfo_ptr\fP\fB);\fP
+
+\fI\fB
+
+\fBvoid png_init_mmx_flags (png_structp \fIpng_ptr\fP\fB);\fP
+
+\fI\fB
+
+\fBvoid png_init_read_transformations (png_structp \fIpng_ptr\fP\fB);\fP
+
+\fI\fB
+
+\fBvoid png_process_IDAT_data (png_structp \fP\fIpng_ptr\fP\fB, png_bytep \fP\fIbuffer\fP\fB, png_size_t \fIbuffer_length\fP\fB);\fP
+
+\fI\fB
+
+\fBvoid png_process_some_data (png_structp \fP\fIpng_ptr\fP\fB, png_infop \fIinfo_ptr\fP\fB);\fP
+
+\fI\fB
+
+\fBvoid png_push_check_crc (png_structp \fIpng_ptr\fP\fB);\fP
+
+\fI\fB
+
+\fBvoid png_push_crc_finish (png_structp \fIpng_ptr\fP\fB);\fP
+
+\fI\fB
+
+\fBvoid png_push_crc_skip (png_structp \fP\fIpng_ptr\fP\fB, png_uint_32 \fIlength\fP\fB);\fP
+
+\fI\fB
+
+\fBvoid png_push_fill_buffer (png_structp \fP\fIpng_ptr\fP\fB, png_bytep \fP\fIbuffer\fP\fB, png_size_t \fIlength\fP\fB);\fP
+
+\fI\fB
+
+\fBvoid png_push_handle_tEXt (png_structp \fP\fIpng_ptr\fP\fB, png_infop \fP\fIinfo_ptr\fP\fB, png_uint_32 \fIlength\fP\fB);\fP
+
+\fI\fB
+
+\fBvoid png_push_handle_unknown (png_structp \fP\fIpng_ptr\fP\fB, png_infop \fP\fIinfo_ptr\fP\fB, png_uint_32 \fIlength\fP\fB);\fP
+
+\fI\fB
+
+\fBvoid png_push_handle_zTXt (png_structp \fP\fIpng_ptr\fP\fB, png_infop \fP\fIinfo_ptr\fP\fB, png_uint_32 \fIlength\fP\fB);\fP
+
+\fI\fB
+
+\fBvoid png_push_have_end (png_structp \fP\fIpng_ptr\fP\fB, png_infop \fIinfo_ptr\fP\fB);\fP
+
+\fI\fB
+
+\fBvoid png_push_have_info (png_structp \fP\fIpng_ptr\fP\fB, png_infop \fIinfo_ptr\fP\fB);\fP
+
+\fI\fB
+
+\fBvoid png_push_have_row (png_structp \fP\fIpng_ptr\fP\fB, png_bytep \fIrow\fP\fB);\fP
+
+\fI\fB
+
+\fBvoid png_push_process_row (png_structp \fIpng_ptr\fP\fB);\fP
+
+\fI\fB
+
+\fBvoid png_push_read_chunk (png_structp \fP\fIpng_ptr\fP\fB, png_infop \fIinfo_ptr\fP\fB);\fP
+
+\fI\fB
+
+\fBvoid png_push_read_end (png_structp \fP\fIpng_ptr\fP\fB, png_infop \fIinfo_ptr\fP\fB);\fP
+
+\fI\fB
+
+\fBvoid png_push_read_IDAT (png_structp \fIpng_ptr\fP\fB);\fP
+
+\fI\fB
+
+\fBvoid png_push_read_sig (png_structp \fP\fIpng_ptr\fP\fB, png_infop \fIinfo_ptr\fP\fB);\fP
+
+\fI\fB
+
+\fBvoid png_push_read_tEXt (png_structp \fP\fIpng_ptr\fP\fB, png_infop \fIinfo_ptr\fP\fB);\fP
+
+\fI\fB
+
+\fBvoid png_push_read_zTXt (png_structp \fP\fIpng_ptr\fP\fB, png_infop \fIinfo_ptr\fP\fB);\fP
+
+\fI\fB
+
+\fBvoid png_push_restore_buffer (png_structp \fP\fIpng_ptr\fP\fB, png_bytep \fP\fIbuffer\fP\fB, png_size_t \fIbuffer_length\fP\fB);\fP
+
+\fI\fB
+
+\fBvoid png_push_save_buffer (png_structp \fIpng_ptr\fP\fB);\fP
+
+\fI\fB
+
+\fBvoid png_read_data (png_structp \fP\fIpng_ptr\fP\fB, png_bytep \fP\fIdata\fP\fB, png_size_t \fIlength\fP\fB);\fP
+
+\fI\fB
+
+\fBvoid png_read_filter_row (png_structp \fP\fIpng_ptr\fP\fB, png_row_infop \fP\fIrow_info\fP\fB, png_bytep \fP\fIrow\fP\fB, png_bytep \fP\fIprev_row\fP\fB, int \fIfilter\fP\fB);\fP
+
+\fI\fB
+
+\fBvoid png_read_finish_row (png_structp \fIpng_ptr\fP\fB);\fP
+
+\fI\fB
+
+\fBvoid png_read_push_finish_row (png_structp \fIpng_ptr\fP\fB);\fP
+
+\fI\fB
+
+\fBvoid png_read_start_row (png_structp \fIpng_ptr\fP\fB);\fP
+
+\fI\fB
+
+\fBvoid png_read_transform_info (png_structp \fP\fIpng_ptr\fP\fB, png_infop \fIinfo_ptr\fP\fB);\fP
+
+\fI\fB
+
+\fBvoid png_reset_crc (png_structp \fIpng_ptr\fP\fB);\fP
+
+\fI\fB
+
+\fBvoid png_save_int_32 (png_bytep \fP\fIbuf\fP\fB, png_int_32 \fIi\fP\fB);\fP
+
+\fI\fB
+
+\fBvoid png_save_uint_16 (png_bytep \fP\fIbuf\fP\fB, unsigned int \fIi\fP\fB);\fP
+
+\fI\fB
+
+\fBvoid png_save_uint_32 (png_bytep \fP\fIbuf\fP\fB, png_uint_32 \fIi\fP\fB);\fP
+
+\fI\fB
+
+\fBint png_set_text_2 (png_structp \fP\fIpng_ptr\fP\fB, png_infop \fP\fIinfo_ptr\fP\fB, png_textp \fP\fItext_ptr\fP\fB, int \fInum_text)\fP\fB);\fP
+
+\fI\fB
+
+\fBvoid png_write_cHRM (png_structp \fP\fIpng_ptr\fP\fB, double \fP\fIwhite_x\fP\fB, double \fP\fIwhite_y\fP\fB, double \fP\fIred_x\fP\fB, double \fP\fIred_y\fP\fB, double \fP\fIgreen_x\fP\fB, double \fP\fIgreen_y\fP\fB, double \fP\fIblue_x\fP\fB, double \fIblue_y\fP\fB);\fP
+
+\fI\fB
+
+\fBvoid png_write_cHRM_fixed (png_structp \fP\fIpng_ptr\fP\fB, png_uint_32 \fP\fIwhite_x\fP\fB, png_uint_32 \fP\fIwhite_y\fP\fB, png_uint_32 \fP\fIred_x\fP\fB, png_uint_32 \fP\fIred_y\fP\fB, png_uint_32 \fP\fIgreen_x\fP\fB, png_uint_32 \fP\fIgreen_y\fP\fB, png_uint_32 \fP\fIblue_x\fP\fB, png_uint_32 \fIblue_y\fP\fB);\fP
+
+\fI\fB
+
+\fBvoid png_write_data (png_structp \fP\fIpng_ptr\fP\fB, png_bytep \fP\fIdata\fP\fB, png_size_t \fIlength\fP\fB);\fP
+
+\fI\fB
+
+\fBvoid png_write_filtered_row (png_structp \fP\fIpng_ptr\fP\fB, png_bytep \fIfiltered_row\fP\fB);\fP
+
+\fI\fB
+
+\fBvoid png_write_find_filter (png_structp \fP\fIpng_ptr\fP\fB, png_row_infop \fIrow_info\fP\fB);\fP
+
+\fI\fB
+
+\fBvoid png_write_finish_row (png_structp \fIpng_ptr\fP\fB);\fP
+
+\fI\fB
+
+\fBvoid png_write_gAMA (png_structp \fP\fIpng_ptr\fP\fB, double \fIfile_gamma\fP\fB);\fP
+
+\fI\fB
+
+\fBvoid png_write_gAMA_fixed (png_structp \fP\fIpng_ptr\fP\fB, png_uint_32 \fIint_file_gamma\fP\fB);\fP
+
+\fI\fB
+
+\fBvoid png_write_hIST (png_structp \fP\fIpng_ptr\fP\fB, png_uint_16p \fP\fIhist\fP\fB, int \fInum_hist\fP\fB);\fP
+
+\fI\fB
+
+\fBvoid png_write_iCCP (png_structp \fP\fIpng_ptr\fP\fB, png_charp \fP\fIname\fP\fB, int \fP\fIcompression_type\fP\fB, png_charp \fP\fIprofile\fP\fB, int \fIproflen\fP\fB);\fP
+
+\fI\fB
+
+\fBvoid png_write_IDAT (png_structp \fP\fIpng_ptr\fP\fB, png_bytep \fP\fIdata\fP\fB, png_size_t \fIlength\fP\fB);\fP
+
+\fI\fB
+
+\fBvoid png_write_IEND (png_structp \fIpng_ptr\fP\fB);\fP
+
+\fI\fB
+
+\fBvoid png_write_IHDR (png_structp \fP\fIpng_ptr\fP\fB, png_uint_32 \fP\fIwidth\fP\fB, png_uint_32 \fP\fIheight\fP\fB, int \fP\fIbit_depth\fP\fB, int \fP\fIcolor_type\fP\fB, int \fP\fIcompression_type\fP\fB, int \fP\fIfilter_type\fP\fB, int \fIinterlace_type\fP\fB);\fP
+
+\fI\fB
+
+\fBvoid png_write_iTXt (png_structp \fP\fIpng_ptr\fP\fB, int \fP\fIcompression\fP\fB, png_charp \fP\fIkey\fP\fB, png_charp \fP\fIlang\fP\fB, png_charp \fP\fItranslated_key\fP\fB, png_charp \fItext)\fP\fB);\fP
+
+\fI\fB
+
+\fBvoid png_write_oFFs (png_structp \fP\fIpng_ptr\fP\fB, png_uint_32 \fP\fIx_offset\fP\fB, png_uint_32 \fP\fIy_offset\fP\fB, int \fIunit_type\fP\fB);\fP
+
+\fI\fB
+
+\fBvoid png_write_pCAL (png_structp \fP\fIpng_ptr\fP\fB, png_charp \fP\fIpurpose\fP\fB, png_int_32 \fP\fIX0\fP\fB, png_int_32 \fP\fIX1\fP\fB, int \fP\fItype\fP\fB, int \fP\fInparams\fP\fB, png_charp \fP\fIunits\fP\fB, png_charpp \fIparams\fP\fB);\fP
+
+\fI\fB
+
+\fBvoid png_write_pHYs (png_structp \fP\fIpng_ptr\fP\fB, png_uint_32 \fP\fIx_pixels_per_unit\fP\fB, png_uint_32 \fP\fIy_pixels_per_unit\fP\fB, int \fIunit_type\fP\fB);\fP
+
+\fI\fB
+
+\fBvoid png_write_PLTE (png_structp \fP\fIpng_ptr\fP\fB, png_colorp \fP\fIpalette\fP\fB, png_uint_32 \fInum_pal\fP\fB);\fP
+
+\fI\fB
+
+\fBvoid png_write_sBIT (png_structp \fP\fIpng_ptr\fP\fB, png_color_8p \fP\fIsbit\fP\fB, int \fIcolor_type\fP\fB);\fP
+
+\fI\fB
+
+\fBvoid png_write_sCAL (png_structp \fP\fIpng_ptr\fP\fB, png_charp \fP\fIunit\fP\fB, double \fP\fIwidth\fP\fB, double \fIheight\fP\fB);\fP
+
+\fI\fB
+
+\fBvoid png_write_sCAL_s (png_structp \fP\fIpng_ptr\fP\fB, png_charp \fP\fIunit\fP\fB, png_charp \fP\fIwidth\fP\fB, png_charp \fIheight\fP\fB);\fP
+
+\fI\fB
+
+\fBvoid png_write_sig (png_structp \fIpng_ptr\fP\fB);\fP
+
+\fI\fB
+
+\fBvoid png_write_sRGB (png_structp \fP\fIpng_ptr\fP\fB, int \fIintent\fP\fB);\fP
+
+\fI\fB
+
+\fBvoid png_write_sPLT (png_structp \fP\fIpng_ptr\fP\fB, png_spalette_p \fIpalette\fP\fB);\fP
+
+\fI\fB
+
+\fBvoid png_write_start_row (png_structp \fIpng_ptr\fP\fB);\fP
+
+\fI\fB
+
+\fBvoid png_write_tEXt (png_structp \fP\fIpng_ptr\fP\fB, png_charp \fP\fIkey\fP\fB, png_charp \fP\fItext\fP\fB, png_size_t \fItext_len\fP\fB);\fP
+
+\fI\fB
+
+\fBvoid png_write_tIME (png_structp \fP\fIpng_ptr\fP\fB, png_timep \fImod_time\fP\fB);\fP
+
+\fI\fB
+
+\fBvoid png_write_tRNS (png_structp \fP\fIpng_ptr\fP\fB, png_bytep \fP\fItrans\fP\fB, png_color_16p \fP\fIvalues\fP\fB, int \fP\fInumber\fP\fB, int \fIcolor_type\fP\fB);\fP
+
+\fI\fB
+
+\fBvoid png_write_zTXt (png_structp \fP\fIpng_ptr\fP\fB, png_charp \fP\fIkey\fP\fB, png_charp \fP\fItext\fP\fB, png_size_t \fP\fItext_len\fP\fB, int \fIcompression\fP\fB);\fP
+
+\fI\fB
+
+\fBvoidpf png_zalloc (voidpf \fP\fIpng_ptr\fP\fB, uInt \fP\fIitems\fP\fB, uInt \fIsize\fP\fB);\fP
+
+\fI\fB
+
+\fBvoid png_zfree (voidpf \fP\fIpng_ptr\fP\fB, voidpf \fIptr\fP\fB);\fP
+
+\fI\fB
.SH DESCRIPTION
The functions listed above are used privately by libpng
-and are not recommended for use by applications. They
+and are not recommended for use by applications. They are
+not "exported" to applications using shared libraries. They
are listed alphabetically here as an aid to libpng maintainers.
See png.h for more information on these functions.
-.TH PNG 5 "January 14, 1999"
+.TH PNG 5 "July 8, 2002"
.SH NAME
png \- Portable Network Graphics (PNG) format
.SH DESCRIPTION
.SH "SEE ALSO"
.IR libpng(3), zlib(3), deflate(5), and zlib(5)
.LP
-PNG specification:
+PNG 1.2 specification, July 1999:
+.IP
+.br
+http://www.libpng.org/pub/png
+.br
+or ftp://ftp.uu.net/graphics/png/documents
+.LP
+PNG 1.0 specification, October 1996:
+.IP
+.br
RFC 2083
.IP
.br
.SH AUTHORS
This man page: Glenn Randers-Pehrson
.LP
+Portable Network Graphics (PNG) Specification Version 1.2 (July 8, 1999):
+Glenn Randers-Pehrson and others (png-list@ccrc.wustl.edu).
+.LP
Portable Network Graphics (PNG) Specification Version 1.0 (October 1, 1996):
-Thomas Boutell and others (png-list@dworkin.wustl.edu).
+Thomas Boutell and others (png-list@ccrc.wustl.edu).
.LP
+
.SH COPYRIGHT NOTICE
-The PNG specification is copyright (c) 1996 Massachussets Institute of
+The PNG-1.2 specification is copyright (c) 1999 Glenn Randers-Pehrson.
+See the specification for conditions of use and distribution.
+.LP
+The PNG-1.0 specification is copyright (c) 1996 Massachusetts Institute of
Technology. See the specification for conditions of use and distribution.
.LP
.\" end of man page
/* png.c - location for general purpose libpng functions
*
- * libpng version 1.0.3 - January 14, 1999
- * Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.
- * Copyright (c) 1996, 1997 Andreas Dilger
- * Copyright (c) 1998, 1999 Glenn Randers-Pehrson
- *
+ * libpng version 1.2.4 - July 8, 2002
+ * Copyright (c) 1998-2002 Glenn Randers-Pehrson
+ * (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger)
+ * (Version 0.88 Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.)
+ *
*/
#define PNG_INTERNAL
#define PNG_NO_EXTERN
#include "png.h"
+/* Generate a compiler error if there is an old png.h in the search path. */
+typedef version_1_2_4 Your_png_h_is_not_version_1_2_4;
+
/* Version information for C files. This had better match the version
- * string defined in png.h.
- */
+ * string defined in png.h. */
-char png_libpng_ver[12] = "1.0.3";
+#ifdef PNG_USE_GLOBAL_ARRAYS
+/* png_libpng_ver was changed to a function in version 1.0.5c */
+const char png_libpng_ver[18] = "1.2.4";
+/* png_sig was changed to a function in version 1.0.5c */
/* Place to hold the signature string for a PNG file. */
-png_byte FARDATA png_sig[8] = {137, 80, 78, 71, 13, 10, 26, 10};
-
-/* Constant strings for known chunk types. If you need to add a chunk,
- * add a string holding the name here. If you want to make the code
- * portable to EBCDIC machines, use ASCII numbers, not characters.
- */
-png_byte FARDATA png_IHDR[5] = { 73, 72, 68, 82, '\0'};
-png_byte FARDATA png_IDAT[5] = { 73, 68, 65, 84, '\0'};
-png_byte FARDATA png_IEND[5] = { 73, 69, 78, 68, '\0'};
-png_byte FARDATA png_PLTE[5] = { 80, 76, 84, 69, '\0'};
-png_byte FARDATA png_bKGD[5] = { 98, 75, 71, 68, '\0'};
-png_byte FARDATA png_cHRM[5] = { 99, 72, 82, 77, '\0'};
-png_byte FARDATA png_gAMA[5] = {103, 65, 77, 65, '\0'};
-png_byte FARDATA png_hIST[5] = {104, 73, 83, 84, '\0'};
-png_byte FARDATA png_oFFs[5] = {111, 70, 70, 115, '\0'};
-png_byte FARDATA png_pCAL[5] = {112, 67, 65, 76, '\0'};
-png_byte FARDATA png_pHYs[5] = {112, 72, 89, 115, '\0'};
-png_byte FARDATA png_sBIT[5] = {115, 66, 73, 84, '\0'};
-png_byte FARDATA png_sRGB[5] = {115, 82, 71, 66, '\0'};
-png_byte FARDATA png_tEXt[5] = {116, 69, 88, 116, '\0'};
-png_byte FARDATA png_tIME[5] = {116, 73, 77, 69, '\0'};
-png_byte FARDATA png_tRNS[5] = {116, 82, 78, 83, '\0'};
-png_byte FARDATA png_zTXt[5] = {122, 84, 88, 116, '\0'};
+const png_byte FARDATA png_sig[8] = {137, 80, 78, 71, 13, 10, 26, 10};
+
+/* Invoke global declarations for constant strings for known chunk types */
+PNG_IHDR;
+PNG_IDAT;
+PNG_IEND;
+PNG_PLTE;
+PNG_bKGD;
+PNG_cHRM;
+PNG_gAMA;
+PNG_hIST;
+PNG_iCCP;
+PNG_iTXt;
+PNG_oFFs;
+PNG_pCAL;
+PNG_sCAL;
+PNG_pHYs;
+PNG_sBIT;
+PNG_sPLT;
+PNG_sRGB;
+PNG_tEXt;
+PNG_tIME;
+PNG_tRNS;
+PNG_zTXt;
/* arrays to facilitate easy interlacing - use pass (0 - 6) as index */
/* start of interlace block */
-int FARDATA png_pass_start[] = {0, 4, 0, 2, 0, 1, 0};
+const int FARDATA png_pass_start[] = {0, 4, 0, 2, 0, 1, 0};
/* offset to next interlace block */
-int FARDATA png_pass_inc[] = {8, 8, 4, 4, 2, 2, 1};
+const int FARDATA png_pass_inc[] = {8, 8, 4, 4, 2, 2, 1};
/* start of interlace block in the y direction */
-int FARDATA png_pass_ystart[] = {0, 0, 4, 0, 2, 0, 1};
+const int FARDATA png_pass_ystart[] = {0, 0, 4, 0, 2, 0, 1};
/* offset to next interlace block in the y direction */
-int FARDATA png_pass_yinc[] = {8, 8, 8, 4, 4, 2, 2};
+const int FARDATA png_pass_yinc[] = {8, 8, 8, 4, 4, 2, 2};
-/* Width of interlace block. This is not currently used - if you need
- * it, uncomment it here and in png.h
-int FARDATA png_pass_width[] = {8, 4, 4, 2, 2, 1, 1};
-*/
+/* width of interlace block (used in assembler routines only) */
+#ifdef PNG_HAVE_ASSEMBLER_COMBINE_ROW
+const int FARDATA png_pass_width[] = {8, 4, 4, 2, 2, 1, 1};
+#endif
/* Height of interlace block. This is not currently used - if you need
* it, uncomment it here and in png.h
-int FARDATA png_pass_height[] = {8, 8, 4, 4, 2, 2, 1};
+const int FARDATA png_pass_height[] = {8, 8, 4, 4, 2, 2, 1};
*/
/* Mask to determine which pixels are valid in a pass */
-int FARDATA png_pass_mask[] = {0x80, 0x08, 0x88, 0x22, 0xaa, 0x55, 0xff};
+const int FARDATA png_pass_mask[] = {0x80, 0x08, 0x88, 0x22, 0xaa, 0x55, 0xff};
/* Mask to determine which pixels to overwrite while displaying */
-int FARDATA png_pass_dsp_mask[] = {0xff, 0x0f, 0xff, 0x33, 0xff, 0x55, 0xff};
+const int FARDATA png_pass_dsp_mask[]
+ = {0xff, 0x0f, 0xff, 0x33, 0xff, 0x55, 0xff};
+#endif
/* Tells libpng that we have already handled the first "num_bytes" bytes
* of the PNG file signature. If the PNG data is embedded into another
* stream we can set num_bytes = 8 so that libpng will not attempt to read
* or write any of the magic bytes before it starts on the IHDR.
*/
-void
+
+void PNGAPI
png_set_sig_bytes(png_structp png_ptr, int num_bytes)
{
png_debug(1, "in png_set_sig_bytes\n");
if (num_bytes > 8)
png_error(png_ptr, "Too many bytes for PNG signature.");
- png_ptr->sig_bytes = num_bytes < 0 ? 0 : num_bytes;
+ png_ptr->sig_bytes = (png_byte)(num_bytes < 0 ? 0 : num_bytes);
}
/* Checks whether the supplied bytes match the PNG signature. We allow
* respectively, to be less than, to match, or be greater than the correct
* PNG signature (this is the same behaviour as strcmp, memcmp, etc).
*/
-int
+int PNGAPI
png_sig_cmp(png_bytep sig, png_size_t start, png_size_t num_to_check)
{
+ png_byte png_signature[8] = {137, 80, 78, 71, 13, 10, 26, 10};
if (num_to_check > 8)
num_to_check = 8;
else if (num_to_check < 1)
if (start + num_to_check > 8)
num_to_check = 8 - start;
- return ((int)(png_memcmp(&sig[start], &png_sig[start], num_to_check)));
+ return ((int)(png_memcmp(&sig[start], &png_signature[start], num_to_check)));
}
/* (Obsolete) function to check signature bytes. It does not allow one
* to check a partial signature. This function might be removed in the
* future - use png_sig_cmp(). Returns true (nonzero) if the file is a PNG.
*/
-int
+int PNGAPI
png_check_sig(png_bytep sig, int num)
{
return ((int)!png_sig_cmp(sig, (png_size_t)0, (png_size_t)num));
}
-/* Function to allocate memory for zlib. */
-voidpf
+/* Function to allocate memory for zlib and clear it to 0. */
+#ifdef PNG_1_0_X
+void PNGAPI
+#else
+voidpf /* private */
+#endif
png_zalloc(voidpf png_ptr, uInt items, uInt size)
{
png_uint_32 num_bytes = (png_uint_32)items * size;
- png_voidp ptr = (png_voidp)png_malloc((png_structp)png_ptr, num_bytes);
+ png_voidp ptr;
+ png_structp p=png_ptr;
+ png_uint_32 save_flags=p->flags;
+
+ p->flags|=PNG_FLAG_MALLOC_NULL_MEM_OK;
+ ptr = (png_voidp)png_malloc((png_structp)png_ptr, num_bytes);
+ p->flags=save_flags;
+
+#ifndef PNG_NO_ZALLOC_ZERO
+ if (ptr == NULL)
+ return ((voidpf)ptr);
if (num_bytes > (png_uint_32)0x8000L)
{
{
png_memset(ptr, 0, (png_size_t)num_bytes);
}
+#endif
return ((voidpf)ptr);
}
/* function to free memory for zlib */
-void
+#ifdef PNG_1_0_X
+void PNGAPI
+#else
+void /* private */
+#endif
png_zfree(voidpf png_ptr, voidpf ptr)
{
png_free((png_structp)png_ptr, (png_voidp)ptr);
/* Reset the CRC variable to 32 bits of 1's. Care must be taken
* in case CRC is > 32 bits to leave the top bits 0.
*/
-void
+void /* PRIVATE */
png_reset_crc(png_structp png_ptr)
{
png_ptr->crc = crc32(0, Z_NULL, 0);
* also check that this data will actually be used before going to the
* trouble of calculating it.
*/
-void
+void /* PRIVATE */
png_calculate_crc(png_structp png_ptr, png_bytep ptr, png_size_t length)
{
int need_crc = 1;
* and png_info_init() so that applications that want to use a shared
* libpng don't have to be recompiled if png_info changes size.
*/
-png_infop
+png_infop PNGAPI
png_create_info_struct(png_structp png_ptr)
{
png_infop info_ptr;
png_debug(1, "in png_create_info_struct\n");
if(png_ptr == NULL) return (NULL);
#ifdef PNG_USER_MEM_SUPPORTED
- if ((info_ptr = (png_infop)png_create_struct_2(PNG_STRUCT_INFO,
- png_ptr->malloc_fn)) != NULL)
+ info_ptr = (png_infop)png_create_struct_2(PNG_STRUCT_INFO,
+ png_ptr->malloc_fn, png_ptr->mem_ptr);
#else
- if ((info_ptr = (png_infop)png_create_struct(PNG_STRUCT_INFO)) != NULL)
+ info_ptr = (png_infop)png_create_struct(PNG_STRUCT_INFO);
#endif
- {
- png_info_init(info_ptr);
- }
+ if (info_ptr != NULL)
+ png_info_init_3(&info_ptr, sizeof(png_info));
return (info_ptr);
}
* png_destroy_write_struct() to free an info struct, but this may be
* useful for some applications.
*/
-void
+void PNGAPI
png_destroy_info_struct(png_structp png_ptr, png_infopp info_ptr_ptr)
{
png_infop info_ptr = NULL;
png_info_destroy(png_ptr, info_ptr);
#ifdef PNG_USER_MEM_SUPPORTED
- png_destroy_struct_2((png_voidp)info_ptr, png_ptr->free_fn);
+ png_destroy_struct_2((png_voidp)info_ptr, png_ptr->free_fn,
+ png_ptr->mem_ptr);
#else
png_destroy_struct((png_voidp)info_ptr);
#endif
- *info_ptr_ptr = (png_infop)NULL;
+ *info_ptr_ptr = NULL;
}
}
* and applications using it are urged to use png_create_info_struct()
* instead.
*/
-void
+#undef png_info_init
+void PNGAPI
png_info_init(png_infop info_ptr)
{
- png_debug(1, "in png_info_init\n");
+ /* We only come here via pre-1.0.12-compiled applications */
+ png_info_init_3(&info_ptr, 0);
+}
+
+void PNGAPI
+png_info_init_3(png_infopp ptr_ptr, png_size_t png_info_struct_size)
+{
+ png_infop info_ptr = *ptr_ptr;
+
+ png_debug(1, "in png_info_init_3\n");
+
+ if(sizeof(png_info) > png_info_struct_size)
+ {
+ png_destroy_struct(info_ptr);
+ info_ptr = (png_infop)png_create_struct(PNG_STRUCT_INFO);
+ *ptr_ptr = info_ptr;
+ }
+
/* set everything to 0 */
png_memset(info_ptr, 0, sizeof (png_info));
}
+#ifdef PNG_FREE_ME_SUPPORTED
+void PNGAPI
+png_data_freer(png_structp png_ptr, png_infop info_ptr,
+ int freer, png_uint_32 mask)
+{
+ png_debug(1, "in png_data_freer\n");
+ if (png_ptr == NULL || info_ptr == NULL)
+ return;
+ if(freer == PNG_DESTROY_WILL_FREE_DATA)
+ info_ptr->free_me |= mask;
+ else if(freer == PNG_USER_WILL_FREE_DATA)
+ info_ptr->free_me &= ~mask;
+ else
+ png_warning(png_ptr,
+ "Unknown freer parameter in png_data_freer.");
+}
+#endif
+
+void PNGAPI
+png_free_data(png_structp png_ptr, png_infop info_ptr, png_uint_32 mask,
+ int num)
+{
+ png_debug(1, "in png_free_data\n");
+ if (png_ptr == NULL || info_ptr == NULL)
+ return;
+
+#if defined(PNG_TEXT_SUPPORTED)
+/* free text item num or (if num == -1) all text items */
+#ifdef PNG_FREE_ME_SUPPORTED
+if ((mask & PNG_FREE_TEXT) & info_ptr->free_me)
+#else
+if (mask & PNG_FREE_TEXT)
+#endif
+{
+ if (num != -1)
+ {
+ if (info_ptr->text && info_ptr->text[num].key)
+ {
+ png_free(png_ptr, info_ptr->text[num].key);
+ info_ptr->text[num].key = NULL;
+ }
+ }
+ else
+ {
+ int i;
+ for (i = 0; i < info_ptr->num_text; i++)
+ png_free_data(png_ptr, info_ptr, PNG_FREE_TEXT, i);
+ png_free(png_ptr, info_ptr->text);
+ info_ptr->text = NULL;
+ info_ptr->num_text=0;
+ }
+}
+#endif
+
+#if defined(PNG_tRNS_SUPPORTED)
+/* free any tRNS entry */
+#ifdef PNG_FREE_ME_SUPPORTED
+if ((mask & PNG_FREE_TRNS) & info_ptr->free_me)
+#else
+if ((mask & PNG_FREE_TRNS) && (png_ptr->flags & PNG_FLAG_FREE_TRNS))
+#endif
+{
+ png_free(png_ptr, info_ptr->trans);
+ info_ptr->valid &= ~PNG_INFO_tRNS;
+#ifndef PNG_FREE_ME_SUPPORTED
+ png_ptr->flags &= ~PNG_FLAG_FREE_TRNS;
+#endif
+ info_ptr->trans = NULL;
+}
+#endif
+
+#if defined(PNG_sCAL_SUPPORTED)
+/* free any sCAL entry */
+#ifdef PNG_FREE_ME_SUPPORTED
+if ((mask & PNG_FREE_SCAL) & info_ptr->free_me)
+#else
+if (mask & PNG_FREE_SCAL)
+#endif
+{
+#if defined(PNG_FIXED_POINT_SUPPORTED) && !defined(PNG_FLOATING_POINT_SUPPORTED)
+ png_free(png_ptr, info_ptr->scal_s_width);
+ png_free(png_ptr, info_ptr->scal_s_height);
+ info_ptr->scal_s_width = NULL;
+ info_ptr->scal_s_height = NULL;
+#endif
+ info_ptr->valid &= ~PNG_INFO_sCAL;
+}
+#endif
+
+#if defined(PNG_pCAL_SUPPORTED)
+/* free any pCAL entry */
+#ifdef PNG_FREE_ME_SUPPORTED
+if ((mask & PNG_FREE_PCAL) & info_ptr->free_me)
+#else
+if (mask & PNG_FREE_PCAL)
+#endif
+{
+ png_free(png_ptr, info_ptr->pcal_purpose);
+ png_free(png_ptr, info_ptr->pcal_units);
+ info_ptr->pcal_purpose = NULL;
+ info_ptr->pcal_units = NULL;
+ if (info_ptr->pcal_params != NULL)
+ {
+ int i;
+ for (i = 0; i < (int)info_ptr->pcal_nparams; i++)
+ {
+ png_free(png_ptr, info_ptr->pcal_params[i]);
+ info_ptr->pcal_params[i]=NULL;
+ }
+ png_free(png_ptr, info_ptr->pcal_params);
+ info_ptr->pcal_params = NULL;
+ }
+ info_ptr->valid &= ~PNG_INFO_pCAL;
+}
+#endif
+
+#if defined(PNG_iCCP_SUPPORTED)
+/* free any iCCP entry */
+#ifdef PNG_FREE_ME_SUPPORTED
+if ((mask & PNG_FREE_ICCP) & info_ptr->free_me)
+#else
+if (mask & PNG_FREE_ICCP)
+#endif
+{
+ png_free(png_ptr, info_ptr->iccp_name);
+ png_free(png_ptr, info_ptr->iccp_profile);
+ info_ptr->iccp_name = NULL;
+ info_ptr->iccp_profile = NULL;
+ info_ptr->valid &= ~PNG_INFO_iCCP;
+}
+#endif
+
+#if defined(PNG_sPLT_SUPPORTED)
+/* free a given sPLT entry, or (if num == -1) all sPLT entries */
+#ifdef PNG_FREE_ME_SUPPORTED
+if ((mask & PNG_FREE_SPLT) & info_ptr->free_me)
+#else
+if (mask & PNG_FREE_SPLT)
+#endif
+{
+ if (num != -1)
+ {
+ if(info_ptr->splt_palettes)
+ {
+ png_free(png_ptr, info_ptr->splt_palettes[num].name);
+ png_free(png_ptr, info_ptr->splt_palettes[num].entries);
+ info_ptr->splt_palettes[num].name = NULL;
+ info_ptr->splt_palettes[num].entries = NULL;
+ }
+ }
+ else
+ {
+ if(info_ptr->splt_palettes_num)
+ {
+ int i;
+ for (i = 0; i < (int)info_ptr->splt_palettes_num; i++)
+ png_free_data(png_ptr, info_ptr, PNG_FREE_SPLT, i);
+
+ png_free(png_ptr, info_ptr->splt_palettes);
+ info_ptr->splt_palettes = NULL;
+ info_ptr->splt_palettes_num = 0;
+ }
+ info_ptr->valid &= ~PNG_INFO_sPLT;
+ }
+}
+#endif
+
+#if defined(PNG_UNKNOWN_CHUNKS_SUPPORTED)
+#ifdef PNG_FREE_ME_SUPPORTED
+if ((mask & PNG_FREE_UNKN) & info_ptr->free_me)
+#else
+if (mask & PNG_FREE_UNKN)
+#endif
+{
+ if (num != -1)
+ {
+ if(info_ptr->unknown_chunks)
+ {
+ png_free(png_ptr, info_ptr->unknown_chunks[num].data);
+ info_ptr->unknown_chunks[num].data = NULL;
+ }
+ }
+ else
+ {
+ int i;
+
+ if(info_ptr->unknown_chunks_num)
+ {
+ for (i = 0; i < (int)info_ptr->unknown_chunks_num; i++)
+ png_free_data(png_ptr, info_ptr, PNG_FREE_UNKN, i);
+
+ png_free(png_ptr, info_ptr->unknown_chunks);
+ info_ptr->unknown_chunks = NULL;
+ info_ptr->unknown_chunks_num = 0;
+ }
+ }
+}
+#endif
+
+#if defined(PNG_hIST_SUPPORTED)
+/* free any hIST entry */
+#ifdef PNG_FREE_ME_SUPPORTED
+if ((mask & PNG_FREE_HIST) & info_ptr->free_me)
+#else
+if ((mask & PNG_FREE_HIST) && (png_ptr->flags & PNG_FLAG_FREE_HIST))
+#endif
+{
+ png_free(png_ptr, info_ptr->hist);
+ info_ptr->hist = NULL;
+ info_ptr->valid &= ~PNG_INFO_hIST;
+#ifndef PNG_FREE_ME_SUPPORTED
+ png_ptr->flags &= ~PNG_FLAG_FREE_HIST;
+#endif
+}
+#endif
+
+/* free any PLTE entry that was internally allocated */
+#ifdef PNG_FREE_ME_SUPPORTED
+if ((mask & PNG_FREE_PLTE) & info_ptr->free_me)
+#else
+if ((mask & PNG_FREE_PLTE) && (png_ptr->flags & PNG_FLAG_FREE_PLTE))
+#endif
+{
+ png_zfree(png_ptr, info_ptr->palette);
+ info_ptr->palette = NULL;
+ info_ptr->valid &= ~PNG_INFO_PLTE;
+#ifndef PNG_FREE_ME_SUPPORTED
+ png_ptr->flags &= ~PNG_FLAG_FREE_PLTE;
+#endif
+ info_ptr->num_palette = 0;
+}
+
+#if defined(PNG_INFO_IMAGE_SUPPORTED)
+/* free any image bits attached to the info structure */
+#ifdef PNG_FREE_ME_SUPPORTED
+if ((mask & PNG_FREE_ROWS) & info_ptr->free_me)
+#else
+if (mask & PNG_FREE_ROWS)
+#endif
+{
+ if(info_ptr->row_pointers)
+ {
+ int row;
+ for (row = 0; row < (int)info_ptr->height; row++)
+ {
+ png_free(png_ptr, info_ptr->row_pointers[row]);
+ info_ptr->row_pointers[row]=NULL;
+ }
+ png_free(png_ptr, info_ptr->row_pointers);
+ info_ptr->row_pointers=NULL;
+ }
+ info_ptr->valid &= ~PNG_INFO_IDAT;
+}
+#endif
+
+#ifdef PNG_FREE_ME_SUPPORTED
+ if(num == -1)
+ info_ptr->free_me &= ~mask;
+ else
+ info_ptr->free_me &= ~(mask & ~PNG_FREE_MUL);
+#endif
+}
+
/* This is an internal routine to free any memory that the info struct is
* pointing to before re-using it or freeing the struct itself. Recall
* that png_free() checks for NULL pointers for us.
*/
-void
+void /* PRIVATE */
png_info_destroy(png_structp png_ptr, png_infop info_ptr)
{
-#if defined(PNG_READ_tEXt_SUPPORTED) || defined(PNG_READ_zTXt_SUPPORTED)
png_debug(1, "in png_info_destroy\n");
- if (info_ptr->text != NULL)
- {
- int i;
- for (i = 0; i < info_ptr->num_text; i++)
- {
- png_free(png_ptr, info_ptr->text[i].key);
- }
- png_free(png_ptr, info_ptr->text);
- }
-#endif
-#if defined(PNG_READ_pCAL_SUPPORTED)
- png_free(png_ptr, info_ptr->pcal_purpose);
- png_free(png_ptr, info_ptr->pcal_units);
- if (info_ptr->pcal_params != NULL)
+
+ png_free_data(png_ptr, info_ptr, PNG_FREE_ALL, -1);
+
+#if defined(PNG_UNKNOWN_CHUNKS_SUPPORTED)
+ if (png_ptr->num_chunk_list)
{
- int i;
- for (i = 0; i < (int)info_ptr->pcal_nparams; i++)
- {
- png_free(png_ptr, info_ptr->pcal_params[i]);
- }
- png_free(png_ptr, info_ptr->pcal_params);
+ png_free(png_ptr, png_ptr->chunk_list);
+ png_ptr->chunk_list=NULL;
+ png_ptr->num_chunk_list=0;
}
#endif
- png_info_init(info_ptr);
+ png_info_init_3(&info_ptr, sizeof(png_info));
}
/* This function returns a pointer to the io_ptr associated with the user
* functions. The application should free any memory associated with this
* pointer before png_write_destroy() or png_read_destroy() are called.
*/
-png_voidp
+png_voidp PNGAPI
png_get_io_ptr(png_structp png_ptr)
{
return (png_ptr->io_ptr);
#if !defined(PNG_NO_STDIO)
/* Initialize the default input/output functions for the PNG file. If you
* use your own read or write routines, you can call either png_set_read_fn()
- * or png_set_write_fn() instead of png_init_io().
+ * or png_set_write_fn() instead of png_init_io(). If you have defined
+ * PNG_NO_STDIO, you must use a function of your own because "FILE *" isn't
+ * necessarily available.
*/
-void
-png_init_io(png_structp png_ptr, FILE *fp)
+void PNGAPI
+png_init_io(png_structp png_ptr, png_FILE_p fp)
{
png_debug(1, "in png_init_io\n");
png_ptr->io_ptr = (png_voidp)fp;
/* Convert the supplied time into an RFC 1123 string suitable for use in
* a "Creation Time" or other text-based time string.
*/
-png_charp
+png_charp PNGAPI
png_convert_to_rfc1123(png_structp png_ptr, png_timep ptime)
{
static PNG_CONST char short_months[12][4] =
sizeof(char)));
}
+#if defined(_WIN32_WCE)
+ {
+ wchar_t time_buf[29];
+ wsprintf(time_buf, TEXT("%d %S %d %02d:%02d:%02d +0000"),
+ ptime->day % 32, short_months[(ptime->month - 1) % 12],
+ ptime->year, ptime->hour % 24, ptime->minute % 60,
+ ptime->second % 61);
+ WideCharToMultiByte(CP_ACP, 0, time_buf, -1, png_ptr->time_buffer, 29,
+ NULL, NULL);
+ }
+#else
#ifdef USE_FAR_KEYWORD
{
char near_time_buf[29];
sprintf(near_time_buf, "%d %s %d %02d:%02d:%02d +0000",
- ptime->day % 32, short_months[(ptime->month - 1) % 12],
- ptime->year, ptime->hour % 24, ptime->minute % 60,
- ptime->second % 61);
+ ptime->day % 32, short_months[(ptime->month - 1) % 12],
+ ptime->year, ptime->hour % 24, ptime->minute % 60,
+ ptime->second % 61);
png_memcpy(png_ptr->time_buffer, near_time_buf,
- 29*sizeof(char));
+ 29*sizeof(char));
}
#else
sprintf(png_ptr->time_buffer, "%d %s %d %02d:%02d:%02d +0000",
- ptime->day % 32, short_months[(ptime->month - 1) % 12],
- ptime->year, ptime->hour % 24, ptime->minute % 60,
- ptime->second % 61);
+ ptime->day % 32, short_months[(ptime->month - 1) % 12],
+ ptime->year, ptime->hour % 24, ptime->minute % 60,
+ ptime->second % 61);
#endif
+#endif /* _WIN32_WCE */
return ((png_charp)png_ptr->time_buffer);
}
#endif /* PNG_TIME_RFC1123_SUPPORTED */
-png_charp
+#if 0
+/* Signature string for a PNG file. */
+png_bytep PNGAPI
+png_sig_bytes(void)
+{
+ return ((png_bytep)"\211\120\116\107\015\012\032\012");
+}
+#endif
+
+png_charp PNGAPI
png_get_copyright(png_structp png_ptr)
{
- if(png_ptr == NULL)
- /* silence compiler warning about unused png_ptr */ ;
- return("\n libpng version 1.0.3 - January 14, 1999\n\
- Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.\n\
- Copyright (c) 1996, 1997 Andreas Dilger\n\
- Copyright (c) 1998, 1999, Glenn Randers-Pehrson\n");
+ if (png_ptr != NULL || png_ptr == NULL) /* silence compiler warning */
+ return ((png_charp) "\n libpng version 1.2.4 - July 8, 2002\n\
+ Copyright (c) 1998-2002 Glenn Randers-Pehrson\n\
+ Copyright (c) 1996-1997 Andreas Dilger\n\
+ Copyright (c) 1995-1996 Guy Eric Schalnat, Group 42, Inc.\n");
+ return ((png_charp) "");
}
+
+/* The following return the library version as a short string in the
+ * format 1.0.0 through 99.99.99zz. To get the version of *.h files used
+ * with your application, print out PNG_LIBPNG_VER_STRING, which is defined
+ * in png.h.
+ */
+
+png_charp PNGAPI
+png_get_libpng_ver(png_structp png_ptr)
+{
+ /* Version of *.c files used when building libpng */
+ if(png_ptr != NULL) /* silence compiler warning about unused png_ptr */
+ return((png_charp) "1.2.4");
+ return((png_charp) "1.2.4");
+}
+
+png_charp PNGAPI
+png_get_header_ver(png_structp png_ptr)
+{
+ /* Version of *.h files used when building libpng */
+ if(png_ptr != NULL) /* silence compiler warning about unused png_ptr */
+ return((png_charp) PNG_LIBPNG_VER_STRING);
+ return((png_charp) PNG_LIBPNG_VER_STRING);
+}
+
+png_charp PNGAPI
+png_get_header_version(png_structp png_ptr)
+{
+ /* Returns longer string containing both version and date */
+ if(png_ptr != NULL) /* silence compiler warning about unused png_ptr */
+ return((png_charp) PNG_HEADER_VERSION_STRING);
+ return((png_charp) PNG_HEADER_VERSION_STRING);
+}
+
+#ifdef PNG_HANDLE_AS_UNKNOWN_SUPPORTED
+int PNGAPI
+png_handle_as_unknown(png_structp png_ptr, png_bytep chunk_name)
+{
+ /* check chunk_name and return "keep" value if it's on the list, else 0 */
+ int i;
+ png_bytep p;
+ if((png_ptr == NULL && chunk_name == NULL) || png_ptr->num_chunk_list<=0)
+ return 0;
+ p=png_ptr->chunk_list+png_ptr->num_chunk_list*5-5;
+ for (i = png_ptr->num_chunk_list; i; i--, p-=5)
+ if (!png_memcmp(chunk_name, p, 4))
+ return ((int)*(p+4));
+ return 0;
+}
+#endif
+
+/* This function, added to libpng-1.0.6g, is untested. */
+int PNGAPI
+png_reset_zstream(png_structp png_ptr)
+{
+ return (inflateReset(&png_ptr->zstream));
+}
+
+/* This function was added to libpng-1.0.7 */
+png_uint_32 PNGAPI
+png_access_version_number(void)
+{
+ /* Version of *.c files used when building libpng */
+ return((png_uint_32) 10204L);
+}
+
+
+#if !defined(PNG_1_0_X)
+#if defined(PNG_ASSEMBLER_CODE_SUPPORTED)
+ /* GRR: could add this: && defined(PNG_MMX_CODE_SUPPORTED) */
+/* this INTERNAL function was added to libpng 1.2.0 */
+void /* PRIVATE */
+png_init_mmx_flags (png_structp png_ptr)
+{
+ png_ptr->mmx_rowbytes_threshold = 0;
+ png_ptr->mmx_bitdepth_threshold = 0;
+
+# if (defined(PNG_USE_PNGVCRD) || defined(PNG_USE_PNGGCCRD))
+
+ png_ptr->asm_flags |= PNG_ASM_FLAG_MMX_SUPPORT_COMPILED;
+
+ if (png_mmx_support()) {
+ png_ptr->asm_flags |= PNG_ASM_FLAG_MMX_SUPPORT_IN_CPU
+# ifdef PNG_HAVE_ASSEMBLER_COMBINE_ROW
+ | PNG_ASM_FLAG_MMX_READ_COMBINE_ROW
+# endif
+# ifdef PNG_HAVE_ASSEMBLER_READ_INTERLACE
+ | PNG_ASM_FLAG_MMX_READ_INTERLACE
+# endif
+# ifndef PNG_HAVE_ASSEMBLER_READ_FILTER_ROW
+ ;
+# else
+ | PNG_ASM_FLAG_MMX_READ_FILTER_SUB
+ | PNG_ASM_FLAG_MMX_READ_FILTER_UP
+ | PNG_ASM_FLAG_MMX_READ_FILTER_AVG
+ | PNG_ASM_FLAG_MMX_READ_FILTER_PAETH ;
+
+ png_ptr->mmx_rowbytes_threshold = PNG_MMX_ROWBYTES_THRESHOLD_DEFAULT;
+ png_ptr->mmx_bitdepth_threshold = PNG_MMX_BITDEPTH_THRESHOLD_DEFAULT;
+# endif
+ } else {
+ png_ptr->asm_flags &= ~( PNG_ASM_FLAG_MMX_SUPPORT_IN_CPU
+ | PNG_MMX_READ_FLAGS
+ | PNG_MMX_WRITE_FLAGS );
+ }
+
+# else /* !((PNGVCRD || PNGGCCRD) && PNG_ASSEMBLER_CODE_SUPPORTED)) */
+
+ /* clear all MMX flags; no support is compiled in */
+ png_ptr->asm_flags &= ~( PNG_MMX_FLAGS );
+
+# endif /* ?(PNGVCRD || PNGGCCRD) */
+}
+
+#endif /* !(PNG_ASSEMBLER_CODE_SUPPORTED) */
+
+/* this function was added to libpng 1.2.0 */
+#if !defined(PNG_USE_PNGGCCRD) && \
+ !(defined(PNG_ASSEMBLER_CODE_SUPPORTED) && defined(PNG_USE_PNGVCRD))
+int PNGAPI
+png_mmx_support(void)
+{
+ return -1;
+}
+#endif
+#endif /* PNG_1_0_X */
-
/* png.h - header file for PNG reference library
*
- * libpng version 1.0.3 - January 14, 1999
- * Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.
- * Copyright (c) 1996, 1997 Andreas Dilger
- * Copyright (c) 1998, 1999 Glenn Randers-Pehrson
- *
- * Y2K compliance in libpng:
- * =========================
- *
- * January 13, 1999
- *
- * Since the PNG Development group is an ad-hoc body, we can't make
- * an official declaration.
- *
- * This is your unofficial assurance that libpng from version 0.81 and
- * upward are Y2K compliant. It is my belief that earlier versions were
- * also Y2K compliant.
- *
- * Libpng only has three year fields. One is a 2-byte unsigned integer
- * that will hold years up to 65535. The other two hold the date in text
- * format, and will hold years up to 9999.
+ * libpng version 1.2.4 - July 8, 2002
+ * Copyright (c) 1998-2002 Glenn Randers-Pehrson
+ * (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger)
+ * (Version 0.88 Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.)
*
- * The integer is
- * "png_uint_16 year" in png_time_struct.
- *
- * The strings are
- * "png_charp time_buffer" in png_struct and
- * "near_time_buffer", which is a local character string in png.c.
- *
- * There are seven time-related functions:
- * png.c: png_convert_to_rfc_1123() in png.c
- * (formerly png_convert_to_rfc_1152() in error)
- * png_convert_from_struct_tm() in pngwrite.c, called in pngwrite.c
- * png_convert_from_time_t() in pngwrite.c
- * png_get_tIME() in pngget.c
- * png_handle_tIME() in pngrutil.c, called in pngread.c
- * png_set_tIME() in pngset.c
- * png_write_tIME() in pngwutil.c, called in pngwrite.c
- *
- * All handle dates properly in a Y2K environment. The
- * png_convert_from_time_t() function calls gmtime() to convert from system
- * clock time, which returns (year - 1900), which we properly convert to
- * the full 4-digit year. There is a possibility that applications using
- * libpng are not passing 4-digit years into the png_convert_to_rfc_1123()
- * function, or incorrectly passing only a 2-digit year instead of
- * "year - 1900" into the png_convert_from_struct_tm() function, but this
- * is not under our control. The libpng documentation has always stated
- * that it works with 4-digit years, and the APIs have been documented as
- * such.
- *
- * The tIME chunk itself is also Y2K compliant. It uses a 2-byte unsigned
- * integer to hold the year, and can hold years as large as 65535.
- *
- *
- * Glenn Randers-Pehrson
- * libpng maintainer
- * PNG Development Group
+ * Authors and maintainers:
+ * libpng versions 0.71, May 1995, through 0.88, January 1996: Guy Schalnat
+ * libpng versions 0.89c, June 1996, through 0.96, May 1997: Andreas Dilger
+ * libpng versions 0.97, January 1998, through 1.2.4 - July 8, 2002: Glenn
+ * See also "Contributing Authors", below.
*
* Note about libpng version numbers:
*
* The following table summarizes matters since version 0.89c, which was
* the first widely used release:
*
- * source png.h png.h shared-lib
- * version string int version
- * ------- ------ ----- ----------
- * 0.89c ("1.0 beta 3") 0.89 89 1.0.89
- * 0.90 ("1.0 beta 4") 0.90 90 0.90 [should have been 2.0.90]
- * 0.95 ("1.0 beta 5") 0.95 95 0.95 [should have been 2.0.95]
- * 0.96 ("1.0 beta 6") 0.96 96 0.96 [should have been 2.0.96]
- * 0.97b ("1.00.97 beta 7") 1.00.97 97 1.0.1 [should have been 2.0.97]
- * 0.97c 0.97 97 2.0.97
- * 0.98 0.98 98 2.0.98
- * 0.99 0.99 98 2.0.99
- * 0.99a-m 0.99 99 2.0.99
- * 1.00 1.00 100 2.1.0 [int should be 10000]
- * 1.0.0 1.0.0 100 2.1.0 [int should be 10000]
- * 1.0.1 1.0.1 10001 2.1.0
- * 1.0.1a-e 1.0.1a-e 10002 2.1.0.1a-e
- * 1.0.2 1.0.2 10002 2.1.0.2
- * 1.0.2a-c 1.0.2a 10003 2.1.0.2a-c
- * 1.0.3 1.0.3 10003 2.1.0.3
+ * source png.h png.h shared-lib
+ * version string int version
+ * ------- ------ ----- ----------
+ * 0.89c "1.0 beta 3" 0.89 89 1.0.89
+ * 0.90 "1.0 beta 4" 0.90 90 0.90 [should have been 2.0.90]
+ * 0.95 "1.0 beta 5" 0.95 95 0.95 [should have been 2.0.95]
+ * 0.96 "1.0 beta 6" 0.96 96 0.96 [should have been 2.0.96]
+ * 0.97b "1.00.97 beta 7" 1.00.97 97 1.0.1 [should have been 2.0.97]
+ * 0.97c 0.97 97 2.0.97
+ * 0.98 0.98 98 2.0.98
+ * 0.99 0.99 98 2.0.99
+ * 0.99a-m 0.99 99 2.0.99
+ * 1.00 1.00 100 2.1.0 [100 should be 10000]
+ * 1.0.0 (from here on, the 100 2.1.0 [100 should be 10000]
+ * 1.0.1 png.h string is 10001 2.1.0
+ * 1.0.1a-e identical to the 10002 from here on, the shared library
+ * 1.0.2 source version) 10002 is 2.V where V is the source code
+ * 1.0.2a-b 10003 version, except as noted.
+ * 1.0.3 10003
+ * 1.0.3a-d 10004
+ * 1.0.4 10004
+ * 1.0.4a-f 10005
+ * 1.0.5 (+ 2 patches) 10005
+ * 1.0.5a-d 10006
+ * 1.0.5e-r 10100 (not source compatible)
+ * 1.0.5s-v 10006 (not binary compatible)
+ * 1.0.6 (+ 3 patches) 10006 (still binary incompatible)
+ * 1.0.6d-f 10007 (still binary incompatible)
+ * 1.0.6g 10007
+ * 1.0.6h 10007 10.6h (testing xy.z so-numbering)
+ * 1.0.6i 10007 10.6i
+ * 1.0.6j 10007 2.1.0.6j (incompatible with 1.0.0)
+ * 1.0.7beta11-14 DLLNUM 10007 2.1.0.7beta11-14 (binary compatible)
+ * 1.0.7beta15-18 1 10007 2.1.0.7beta15-18 (binary compatible)
+ * 1.0.7rc1-2 1 10007 2.1.0.7rc1-2 (binary compatible)
+ * 1.0.7 1 10007 (still compatible)
+ * 1.0.8beta1-4 1 10008 2.1.0.8beta1-4
+ * 1.0.8rc1 1 10008 2.1.0.8rc1
+ * 1.0.8 1 10008 2.1.0.8
+ * 1.0.9beta1-6 1 10009 2.1.0.9beta1-6
+ * 1.0.9rc1 1 10009 2.1.0.9rc1
+ * 1.0.9beta7-10 1 10009 2.1.0.9beta7-10
+ * 1.0.9rc2 1 10009 2.1.0.9rc2
+ * 1.0.9 1 10009 2.1.0.9
+ * 1.0.10beta1 1 10010 2.1.0.10beta1
+ * 1.0.10rc1 1 10010 2.1.0.10rc1
+ * 1.0.10 1 10010 2.1.0.10
+ * 1.0.11beta1-3 1 10011 2.1.0.11beta1-3
+ * 1.0.11rc1 1 10011 2.1.0.11rc1
+ * 1.0.11 1 10011 2.1.0.11
+ * 1.0.12beta1-2 2 10012 2.1.0.12beta1-2
+ * 1.0.12rc1 2 10012 2.1.0.12rc1
+ * 1.0.12 2 10012 2.1.0.12
+ * 1.1.0a-f - 10100 2.1.1.0a-f (branch abandoned)
+ * 1.2.0beta1-2 2 10200 2.1.2.0beta1-2
+ * 1.2.0beta3-5 3 10200 3.1.2.0beta3-5
+ * 1.2.0rc1 3 10200 3.1.2.0rc1
+ * 1.2.0 3 10200 3.1.2.0
+ * 1.2.1beta1-4 3 10201 3.1.2.1beta1-4
+ * 1.2.1rc1-2 3 10201 3.1.2.1rc1-2
+ * 1.2.1 3 10201 3.1.2.1
+ * 1.2.2beta1-6 12 10202 12.so.0.1.2.2beta1-6
+ * 1.0.13beta1 10 10013 10.so.0.1.0.13beta1
+ * 1.0.13rc1 10 10013 10.so.0.1.0.13rc1
+ * 1.2.2rc1 12 10202 12.so.0.1.2.2rc1
+ * 1.0.13 10 10013 10.so.0.1.0.13
+ * 1.2.2 12 10202 12.so.0.1.2.2
+ * 1.2.3rc1-6 12 10203 12.so.0.1.2.3rc1-6
+ * 1.2.3 12 10203 12.so.0.1.2.3
+ * 1.2.4beta1-3 13 10204 12.so.0.1.2.4beta1-3
+ * 1.0.14rc1 13 10014 10.so.0.1.0.14rc1
+ * 1.2.4rc1 13 10204 12.so.0.1.2.4rc1
+ * 1.0.14 10 10014 10.so.0.1.0.14
+ * 1.2.4 13 10204 12.so.0.1.2.4
*
- * Henceforth the source version will match the shared-library minor
- * and patch numbers; the shared-library major version number will be
+ * Henceforth the source version will match the shared-library major
+ * and minor numbers; the shared-library major version number will be
* used for changes in backward compatibility, as it is intended. The
- * PNG_PNGLIB_VER macro, which is not used within libpng but is available
+ * PNG_LIBPNG_VER macro, which is not used within libpng but is available
* for applications, is an unsigned integer of the form xyyzz corresponding
- * to the source version x.y.z (leading zeros in y and z).
+ * to the source version x.y.z (leading zeros in y and z). Beta versions
+ * were given the previous public release number plus a letter, until
+ * version 1.0.6j; from then on they were given the upcoming public
+ * release number plus "betaNN" or "rcN".
+ *
+ * Binary incompatibility exists only when applications make direct access
+ * to the info_ptr or png_ptr members through png.h, and the compiled
+ * application is loaded with a different version of the library.
+ *
+ * DLLNUM will change each time there are forward or backward changes
+ * in binary compatibility (e.g., when a new feature is added).
*
* See libpng.txt or libpng.3 for more information. The PNG specification
* is available as RFC 2083 <ftp://ftp.uu.net/graphics/png/documents/>
* and as a W3C Recommendation <http://www.w3.org/TR/REC.png.html>
+ */
+
+/*
+ * COPYRIGHT NOTICE, DISCLAIMER, and LICENSE:
+ *
+ * If you modify libpng you may insert additional notices immediately following
+ * this sentence.
+ *
+ * libpng versions 1.0.7, July 1, 2000, through 1.2.4, July 8, 2002, are
+ * Copyright (c) 2000-2002 Glenn Randers-Pehrson, and are
+ * distributed according to the same disclaimer and license as libpng-1.0.6
+ * with the following individuals added to the list of Contributing Authors
+ *
+ * Simon-Pierre Cadieux
+ * Eric S. Raymond
+ * Gilles Vollant
+ *
+ * and with the following additions to the disclaimer:
+ *
+ * There is no warranty against interference with your enjoyment of the
+ * library or against infringement. There is no warranty that our
+ * efforts or the library will fulfill any of your particular purposes
+ * or needs. This library is provided with all faults, and the entire
+ * risk of satisfactory quality, performance, accuracy, and effort is with
+ * the user.
+ *
+ * libpng versions 0.97, January 1998, through 1.0.6, March 20, 2000, are
+ * Copyright (c) 1998, 1999, 2000 Glenn Randers-Pehrson
+ * Distributed according to the same disclaimer and license as libpng-0.96,
+ * with the following individuals added to the list of Contributing Authors:
+ *
+ * Tom Lane
+ * Glenn Randers-Pehrson
+ * Willem van Schaik
+ *
+ * libpng versions 0.89, June 1996, through 0.96, May 1997, are
+ * Copyright (c) 1996, 1997 Andreas Dilger
+ * Distributed according to the same disclaimer and license as libpng-0.88,
+ * with the following individuals added to the list of Contributing Authors:
*
- * Contributing Authors:
* John Bowler
* Kevin Bracey
* Sam Bushell
- * Andreas Dilger
* Magnus Holmgren
- * Tom Lane
- * Dave Martindale
- * Glenn Randers-Pehrson
* Greg Roelofs
- * Guy Eric Schalnat
- * Paul Schmidt
* Tom Tanner
- * Willem van Schaik
- * Tim Wegner
*
- * The contributing authors would like to thank all those who helped
- * with testing, bug fixes, and patience. This wouldn't have been
- * possible without all of you.
+ * libpng versions 0.5, May 1995, through 0.88, January 1996, are
+ * Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.
*
- * Thanks to Frank J. T. Wojcik for helping with the documentation.
+ * For the purposes of this copyright and license, "Contributing Authors"
+ * is defined as the following set of individuals:
*
- * COPYRIGHT NOTICE:
+ * Andreas Dilger
+ * Dave Martindale
+ * Guy Eric Schalnat
+ * Paul Schmidt
+ * Tim Wegner
*
* The PNG Reference Library is supplied "AS IS". The Contributing Authors
* and Group 42, Inc. disclaim all warranties, expressed or implied,
* Permission is hereby granted to use, copy, modify, and distribute this
* source code, or portions hereof, for any purpose, without fee, subject
* to the following restrictions:
+ *
* 1. The origin of this source code must not be misrepresented.
- * 2. Altered versions must be plainly marked as such and must not be
- * misrepresented as being the original source.
- * 3. This Copyright notice may not be removed or altered from any source or
- * altered source distribution.
+ *
+ * 2. Altered versions must be plainly marked as such and
+ * must not be misrepresented as being the original source.
+ *
+ * 3. This Copyright notice may not be removed or altered from
+ * any source or altered source distribution.
*
* The Contributing Authors and Group 42, Inc. specifically permit, without
* fee, and encourage the use of this source code as a component to
* appreciated.
*/
+/*
+ * A "png_get_copyright" function is available, for convenient use in "about"
+ * boxes and the like:
+ *
+ * printf("%s",png_get_copyright(NULL));
+ *
+ * Also, the PNG logo (in PNG format, of course) is supplied in the
+ * files "pngbar.png" and "pngbar.jpg (88x31) and "pngnow.png" (98x31).
+ */
-#ifndef _PNG_H
-#define _PNG_H
+/*
+ * Libpng is OSI Certified Open Source Software. OSI Certified is a
+ * certification mark of the Open Source Initiative.
+ */
-#ifdef __cplusplus
-extern "C" {
-#endif /* __cplusplus */
+/*
+ * The contributing authors would like to thank all those who helped
+ * with testing, bug fixes, and patience. This wouldn't have been
+ * possible without all of you.
+ *
+ * Thanks to Frank J. T. Wojcik for helping with the documentation.
+ */
+
+/*
+ * Y2K compliance in libpng:
+ * =========================
+ *
+ * July 8, 2002
+ *
+ * Since the PNG Development group is an ad-hoc body, we can't make
+ * an official declaration.
+ *
+ * This is your unofficial assurance that libpng from version 0.71 and
+ * upward through 1.2.4 are Y2K compliant. It is my belief that earlier
+ * versions were also Y2K compliant.
+ *
+ * Libpng only has three year fields. One is a 2-byte unsigned integer
+ * that will hold years up to 65535. The other two hold the date in text
+ * format, and will hold years up to 9999.
+ *
+ * The integer is
+ * "png_uint_16 year" in png_time_struct.
+ *
+ * The strings are
+ * "png_charp time_buffer" in png_struct and
+ * "near_time_buffer", which is a local character string in png.c.
+ *
+ * There are seven time-related functions:
+ * png.c: png_convert_to_rfc_1123() in png.c
+ * (formerly png_convert_to_rfc_1152() in error)
+ * png_convert_from_struct_tm() in pngwrite.c, called in pngwrite.c
+ * png_convert_from_time_t() in pngwrite.c
+ * png_get_tIME() in pngget.c
+ * png_handle_tIME() in pngrutil.c, called in pngread.c
+ * png_set_tIME() in pngset.c
+ * png_write_tIME() in pngwutil.c, called in pngwrite.c
+ *
+ * All handle dates properly in a Y2K environment. The
+ * png_convert_from_time_t() function calls gmtime() to convert from system
+ * clock time, which returns (year - 1900), which we properly convert to
+ * the full 4-digit year. There is a possibility that applications using
+ * libpng are not passing 4-digit years into the png_convert_to_rfc_1123()
+ * function, or that they are incorrectly passing only a 2-digit year
+ * instead of "year - 1900" into the png_convert_from_struct_tm() function,
+ * but this is not under our control. The libpng documentation has always
+ * stated that it works with 4-digit years, and the APIs have been
+ * documented as such.
+ *
+ * The tIME chunk itself is also Y2K compliant. It uses a 2-byte unsigned
+ * integer to hold the year, and can hold years as large as 65535.
+ *
+ * zlib, upon which libpng depends, is also Y2K compliant. It contains
+ * no date-related code.
+ *
+ * Glenn Randers-Pehrson
+ * libpng maintainer
+ * PNG Development Group
+ */
+
+#ifndef PNG_H
+#define PNG_H
/* This is not the place to learn how to use libpng. The file libpng.txt
* describes how to use libpng, and the file example.c summarizes it
* at the actual function definitions and structure components.
*/
+/* Version information for png.h - this should match the version in png.c */
+#define PNG_LIBPNG_VER_STRING "1.2.4"
+
+#define PNG_LIBPNG_VER_SONUM 0
+#define PNG_LIBPNG_VER_DLLNUM %DLLNUM%
+
+/* These should match the first 3 components of PNG_LIBPNG_VER_STRING: */
+#define PNG_LIBPNG_VER_MAJOR 1
+#define PNG_LIBPNG_VER_MINOR 2
+#define PNG_LIBPNG_VER_RELEASE 4
+/* This should match the numeric part of the final component of
+ * PNG_LIBPNG_VER_STRING, omitting any leading zero: */
+
+#define PNG_LIBPNG_VER_BUILD 0
+
+#define PNG_LIBPNG_BUILD_ALPHA 1
+#define PNG_LIBPNG_BUILD_BETA 2
+#define PNG_LIBPNG_BUILD_RC 3
+#define PNG_LIBPNG_BUILD_STABLE 4
+#define PNG_LIBPNG_BUILD_TYPEMASK 7
+#define PNG_LIBPNG_BUILD_PATCH 8 /* Can be OR'ed with STABLE only */
+#define PNG_LIBPNG_BUILD_TYPE 4
+
+/* Careful here. At one time, Guy wanted to use 082, but that would be octal.
+ * We must not include leading zeros.
+ * Versions 0.7 through 1.0.0 were in the range 0 to 100 here (only
+ * version 1.0.0 was mis-numbered 100 instead of 10000). From
+ * version 1.0.1 it's xxyyzz, where x=major, y=minor, z=release */
+#define PNG_LIBPNG_VER 10204 /* 1.2.4 */
+
+#ifndef PNG_VERSION_INFO_ONLY
+
/* include the compression library's header */
#include "zlib.h"
-/* include all user configurable info */
+/* include all user configurable info, including optional assembler routines */
#include "pngconf.h"
+/* Inhibit C++ name-mangling for libpng functions but not for system calls. */
+#ifdef __cplusplus
+extern "C" {
+#endif /* __cplusplus */
+
/* This file is arranged in several sections. The first section contains
* structure and type definitions. The second section contains the external
* library functions, while the third has the internal library functions,
* which applications aren't expected to use directly.
*/
-/* Version information for png.h - this should match the version in png.c */
-#define PNG_LIBPNG_VER_STRING "1.0.3"
-
-/* Careful here. At one time, Guy wanted to use 082, but that would be octal.
- * We must not include leading zeros.
- * Versions 0.7 through 1.0.0 were in the range 0 to 100 here (only
- * version 1.0.0 was mis-numbered 100 instead of 10000). From
- * version 1.0.1 it's xxyyzz, where x=major, y=minor, z=bugfix */
-#define PNG_LIBPNG_VER 10003 /* 1.0.3 */
+#ifndef PNG_NO_TYPECAST_NULL
+#define int_p_NULL (int *)NULL
+#define png_bytep_NULL (png_bytep)NULL
+#define png_bytepp_NULL (png_bytepp)NULL
+#define png_doublep_NULL (png_doublep)NULL
+#define png_error_ptr_NULL (png_error_ptr)NULL
+#define png_flush_ptr_NULL (png_flush_ptr)NULL
+#define png_free_ptr_NULL (png_free_ptr)NULL
+#define png_infopp_NULL (png_infopp)NULL
+#define png_malloc_ptr_NULL (png_malloc_ptr)NULL
+#define png_read_status_ptr_NULL (png_read_status_ptr)NULL
+#define png_rw_ptr_NULL (png_rw_ptr)NULL
+#define png_structp_NULL (png_structp)NULL
+#define png_uint_16p_NULL (png_uint_16p)NULL
+#define png_voidp_NULL (png_voidp)NULL
+#define png_write_status_ptr_NULL (png_write_status_ptr)NULL
+#else
+#define int_p_NULL NULL
+#define png_bytep_NULL NULL
+#define png_bytepp_NULL NULL
+#define png_doublep_NULL NULL
+#define png_error_ptr_NULL NULL
+#define png_flush_ptr_NULL NULL
+#define png_free_ptr_NULL NULL
+#define png_infopp_NULL NULL
+#define png_malloc_ptr_NULL NULL
+#define png_read_status_ptr_NULL NULL
+#define png_rw_ptr_NULL NULL
+#define png_structp_NULL NULL
+#define png_uint_16p_NULL NULL
+#define png_voidp_NULL NULL
+#define png_write_status_ptr_NULL NULL
+#endif
/* variables declared in png.c - only it needs to define PNG_NO_EXTERN */
#if !defined(PNG_NO_EXTERN) || defined(PNG_ALWAYS_EXTERN)
/* Version information for C files, stored in png.c. This had better match
* the version above.
*/
-extern char png_libpng_ver[12]; /* need room for 99.99.99aa */
+#ifdef PNG_USE_GLOBAL_ARRAYS
+PNG_EXPORT_VAR (const char) png_libpng_ver[18];
+ /* need room for 99.99.99beta99z */
+#else
+#define png_libpng_ver png_get_header_ver(NULL)
+#endif
+#ifdef PNG_USE_GLOBAL_ARRAYS
+/* This was removed in version 1.0.5c */
/* Structures to facilitate easy interlacing. See png.c for more details */
-extern int FARDATA png_pass_start[7];
-extern int FARDATA png_pass_inc[7];
-extern int FARDATA png_pass_ystart[7];
-extern int FARDATA png_pass_yinc[7];
-extern int FARDATA png_pass_mask[7];
-extern int FARDATA png_pass_dsp_mask[7];
-/* These aren't currently used. If you need them, see png.c for more details
-extern int FARDATA png_pass_width[7];
-extern int FARDATA png_pass_height[7];
+PNG_EXPORT_VAR (const int FARDATA) png_pass_start[7];
+PNG_EXPORT_VAR (const int FARDATA) png_pass_inc[7];
+PNG_EXPORT_VAR (const int FARDATA) png_pass_ystart[7];
+PNG_EXPORT_VAR (const int FARDATA) png_pass_yinc[7];
+PNG_EXPORT_VAR (const int FARDATA) png_pass_mask[7];
+PNG_EXPORT_VAR (const int FARDATA) png_pass_dsp_mask[7];
+#ifdef PNG_HAVE_ASSEMBLER_COMBINE_ROW
+PNG_EXPORT_VAR (const int FARDATA) png_pass_width[7];
+#endif
+/* This isn't currently used. If you need it, see png.c for more details.
+PNG_EXPORT_VAR (const int FARDATA) png_pass_height[7];
*/
+#endif
#endif /* PNG_NO_EXTERN */
typedef png_color_8 FAR * png_color_8p;
typedef png_color_8 FAR * FAR * png_color_8pp;
-/* png_text holds the text in a PNG file, and whether they are compressed
- in the PNG file or not. The "text" field points to a regular C string. */
+/*
+ * The following two structures are used for the in-core representation
+ * of sPLT chunks.
+ */
+typedef struct png_sPLT_entry_struct
+{
+ png_uint_16 red;
+ png_uint_16 green;
+ png_uint_16 blue;
+ png_uint_16 alpha;
+ png_uint_16 frequency;
+} png_sPLT_entry;
+typedef png_sPLT_entry FAR * png_sPLT_entryp;
+typedef png_sPLT_entry FAR * FAR * png_sPLT_entrypp;
+
+/* When the depth of the sPLT palette is 8 bits, the color and alpha samples
+ * occupy the LSB of their respective members, and the MSB of each member
+ * is zero-filled. The frequency member always occupies the full 16 bits.
+ */
+
+typedef struct png_sPLT_struct
+{
+ png_charp name; /* palette name */
+ png_byte depth; /* depth of palette samples */
+ png_sPLT_entryp entries; /* palette entries */
+ png_int_32 nentries; /* number of palette entries */
+} png_sPLT_t;
+typedef png_sPLT_t FAR * png_sPLT_tp;
+typedef png_sPLT_t FAR * FAR * png_sPLT_tpp;
+
+#ifdef PNG_TEXT_SUPPORTED
+/* png_text holds the contents of a text/ztxt/itxt chunk in a PNG file,
+ * and whether that contents is compressed or not. The "key" field
+ * points to a regular zero-terminated C string. The "text", "lang", and
+ * "lang_key" fields can be regular C strings, empty strings, or NULL pointers.
+ * However, the * structure returned by png_get_text() will always contain
+ * regular zero-terminated C strings (possibly empty), never NULL pointers,
+ * so they can be safely used in printf() and other string-handling functions.
+ */
typedef struct png_text_struct
{
- int compression; /* compression value, see PNG_TEXT_COMPRESSION_ */
+ int compression; /* compression value:
+ -1: tEXt, none
+ 0: zTXt, deflate
+ 1: iTXt, none
+ 2: iTXt, deflate */
png_charp key; /* keyword, 1-79 character description of "text" */
- png_charp text; /* comment, may be an empty string (ie "") */
- png_size_t text_length; /* length of "text" field */
+ png_charp text; /* comment, may be an empty string (ie "")
+ or a NULL pointer */
+ png_size_t text_length; /* length of the text string */
+#ifdef PNG_iTXt_SUPPORTED
+ png_size_t itxt_length; /* length of the itxt string */
+ png_charp lang; /* language code, 0-79 characters
+ or a NULL pointer */
+ png_charp lang_key; /* keyword translated UTF-8 string, 0 or more
+ chars or a NULL pointer */
+#endif
} png_text;
typedef png_text FAR * png_textp;
typedef png_text FAR * FAR * png_textpp;
+#endif
/* Supported compression types for text in PNG files (tEXt, and zTXt).
* The values of the PNG_TEXT_COMPRESSION_ defines should NOT be changed. */
#define PNG_TEXT_COMPRESSION_zTXt_WR -2
#define PNG_TEXT_COMPRESSION_NONE -1
#define PNG_TEXT_COMPRESSION_zTXt 0
-#define PNG_TEXT_COMPRESSION_LAST 1 /* Not a valid value */
+#define PNG_ITXT_COMPRESSION_NONE 1
+#define PNG_ITXT_COMPRESSION_zTXt 2
+#define PNG_TEXT_COMPRESSION_LAST 3 /* Not a valid value */
/* png_time is a way to hold the time in an machine independent way.
* Two conversions are provided, both from time_t and struct tm. There
* is no portable way to convert to either of these structures, as far
* as I know. If you know of a portable way, send it to me. As a side
- * note - PNG is Year 2000 compliant!
+ * note - PNG has always been Year 2000 compliant!
*/
typedef struct png_time_struct
{
typedef png_time FAR * png_timep;
typedef png_time FAR * FAR * png_timepp;
+#if defined(PNG_UNKNOWN_CHUNKS_SUPPORTED)
+/* png_unknown_chunk is a structure to hold queued chunks for which there is
+ * no specific support. The idea is that we can use this to queue
+ * up private chunks for output even though the library doesn't actually
+ * know about their semantics.
+ */
+typedef struct png_unknown_chunk_t
+{
+ png_byte name[5];
+ png_byte *data;
+ png_size_t size;
+
+ /* libpng-using applications should NOT directly modify this byte. */
+ png_byte location; /* mode of operation at read time */
+}
+png_unknown_chunk;
+typedef png_unknown_chunk FAR * png_unknown_chunkp;
+typedef png_unknown_chunk FAR * FAR * png_unknown_chunkpp;
+#endif
+
/* png_info is a structure that holds the information in a PNG file so
* that the application can find out the characteristics of the image.
* If you are reading the file, this structure will tell you what is
* In any case, the order of the parameters in png_info_struct should NOT
* be changed for as long as possible to keep compatibility with applications
* that use the old direct-access method with png_info_struct.
+ *
+ * The following members may have allocated storage attached that should be
+ * cleaned up before the structure is discarded: palette, trans, text,
+ * pcal_purpose, pcal_units, pcal_params, hist, iccp_name, iccp_profile,
+ * splt_palettes, scal_unit, row_pointers, and unknowns. By default, these
+ * are automatically freed when the info structure is deallocated, if they were
+ * allocated internally by libpng. This behavior can be changed by means
+ * of the png_data_freer() function.
+ *
+ * More allocation details: all the chunk-reading functions that
+ * change these members go through the corresponding png_set_*
+ * functions. A function to clear these members is available: see
+ * png_free_data(). The png_set_* functions do not depend on being
+ * able to point info structure members to any of the storage they are
+ * passed (they make their own copies), EXCEPT that the png_set_text
+ * functions use the same storage passed to them in the text_ptr or
+ * itxt_ptr structure argument, and the png_set_rows and png_set_unknowns
+ * functions do not make their own copies.
*/
typedef struct png_info_struct
{
png_uint_16 num_trans; /* number of transparent palette color (tRNS) */
png_byte bit_depth; /* 1, 2, 4, 8, or 16 bits/channel (from IHDR) */
png_byte color_type; /* see PNG_COLOR_TYPE_ below (from IHDR) */
+ /* The following three should have been named *_method not *_type */
png_byte compression_type; /* must be PNG_COMPRESSION_TYPE_BASE (IHDR) */
png_byte filter_type; /* must be PNG_FILTER_TYPE_BASE (from IHDR) */
png_byte interlace_type; /* One of PNG_INTERLACE_NONE, PNG_INTERLACE_ADAM7 */
/* The following is informational only on read, and not used on writes. */
- png_byte channels; /* number of data channels per pixel (1, 3, 4)*/
+ png_byte channels; /* number of data channels per pixel (1, 2, 3, 4) */
png_byte pixel_depth; /* number of bits per pixel */
png_byte spare_byte; /* to align the data, and for future use */
png_byte signature[8]; /* magic bytes read by libpng from start of file */
* and initialize the appropriate fields below.
*/
-#if defined(PNG_READ_gAMA_SUPPORTED) || defined(PNG_WRITE_gAMA_SUPPORTED) || \
- defined(PNG_READ_GAMMA_SUPPORTED)
+#if defined(PNG_gAMA_SUPPORTED) && defined(PNG_FLOATING_POINT_SUPPORTED)
/* The gAMA chunk describes the gamma characteristics of the system
* on which the image was created, normally in the range [1.0, 2.5].
* Data is valid if (valid & PNG_INFO_gAMA) is non-zero.
*/
float gamma; /* gamma value of image, if (valid & PNG_INFO_gAMA) */
-#endif /* PNG_READ_gAMA_SUPPORTED || PNG_WRITE_gAMA_SUPPORTED */
+#endif
-#if defined(PNG_READ_sRGB_SUPPORTED) || defined(PNG_WRITE_sRGB_SUPPORTED)
+#if defined(PNG_sRGB_SUPPORTED)
/* GR-P, 0.96a */
/* Data valid if (valid & PNG_INFO_sRGB) non-zero. */
png_byte srgb_intent; /* sRGB rendering intent [0, 1, 2, or 3] */
-#endif /* PNG_READ_sRGB_SUPPORTED || PNG_WRITE_sRGB_SUPPORTED */
-
-#if defined(PNG_READ_tEXt_SUPPORTED) || defined(PNG_WRITE_tEXt_SUPPORTED) || \
- defined(PNG_READ_zTXt_SUPPORTED) || defined(PNG_WRITE_zTXt_SUPPORTED)
- /* The tEXt and zTXt chunks contain human-readable textual data in
- * uncompressed and compressed forms, respectively. The data in "text"
- * is an array of pointers to uncompressed, null-terminated C strings.
- * Each chunk has a keyword that describes the textual data contained
- * in that chunk. Keywords are not required to be unique, and the text
- * string may be empty. Any number of text chunks may be in an image.
+#endif
+
+#if defined(PNG_TEXT_SUPPORTED)
+ /* The tEXt, and zTXt chunks contain human-readable textual data in
+ * uncompressed, compressed, and optionally compressed forms, respectively.
+ * The data in "text" is an array of pointers to uncompressed,
+ * null-terminated C strings. Each chunk has a keyword that describes the
+ * textual data contained in that chunk. Keywords are not required to be
+ * unique, and the text string may be empty. Any number of text chunks may
+ * be in an image.
*/
int num_text; /* number of comments read/to write */
int max_text; /* current size of text array */
png_textp text; /* array of comments read/to write */
-#endif /* PNG_READ_OR_WRITE_tEXt_OR_zTXt_SUPPORTED */
-#if defined(PNG_READ_tIME_SUPPORTED) || defined(PNG_WRITE_tIME_SUPPORTED)
+#endif /* PNG_TEXT_SUPPORTED */
+
+#if defined(PNG_tIME_SUPPORTED)
/* The tIME chunk holds the last time the displayed image data was
* modified. See the png_time struct for the contents of this struct.
*/
png_time mod_time;
-#endif /* PNG_READ_tIME_SUPPORTED || PNG_WRITE_tIME_SUPPORTED */
-#if defined(PNG_READ_sBIT_SUPPORTED) || defined(PNG_WRITE_sBIT_SUPPORTED)
+#endif
+
+#if defined(PNG_sBIT_SUPPORTED)
/* The sBIT chunk specifies the number of significant high-order bits
* in the pixel data. Values are in the range [1, bit_depth], and are
* only specified for the channels in the pixel data. The contents of
* (valid & PNG_INFO_sBIT) is non-zero.
*/
png_color_8 sig_bit; /* significant bits in color channels */
-#endif /* PNG_READ_sBIT_SUPPORTED || PNG_WRITE_sBIT_SUPPORTED */
-#if defined(PNG_READ_tRNS_SUPPORTED) || defined(PNG_WRITE_tRNS_SUPPORTED) || \
- defined(PNG_READ_EXPAND_SUPPORTED) || defined(PNG_READ_BACKGROUND_SUPPORTED)
+#endif
+
+#if defined(PNG_tRNS_SUPPORTED) || defined(PNG_READ_EXPAND_SUPPORTED) || \
+defined(PNG_READ_BACKGROUND_SUPPORTED)
/* The tRNS chunk supplies transparency data for paletted images and
* other image types that don't need a full alpha channel. There are
* "num_trans" transparency values for a paletted image, stored in the
*/
png_bytep trans; /* transparent values for paletted image */
png_color_16 trans_values; /* transparent color for non-palette image */
-#endif /* PNG_READ_tRNS_SUPPORTED || PNG_WRITE_tRNS_SUPPORTED */
-#if defined(PNG_READ_bKGD_SUPPORTED) || defined(PNG_WRITE_bKGD_SUPPORTED) || \
- defined(PNG_READ_BACKGROUND_SUPPORTED)
+#endif
+
+#if defined(PNG_bKGD_SUPPORTED) || defined(PNG_READ_BACKGROUND_SUPPORTED)
/* The bKGD chunk gives the suggested image background color if the
* display program does not have its own background color and the image
* is needs to composited onto a background before display. The colors
* pixel data. Data is valid if (valid & PNG_INFO_bKGD) is non-zero.
*/
png_color_16 background;
-#endif /* PNG_READ_bKGD_SUPPORTED || PNG_WRITE_bKGD_SUPPORTED */
-#if defined(PNG_READ_oFFs_SUPPORTED) || defined(PNG_WRITE_oFFs_SUPPORTED)
+#endif
+
+#if defined(PNG_oFFs_SUPPORTED)
/* The oFFs chunk gives the offset in "offset_unit_type" units rightwards
* and downwards from the top-left corner of the display, page, or other
* application-specific co-ordinate space. See the PNG_OFFSET_ defines
* below for the unit types. Valid if (valid & PNG_INFO_oFFs) non-zero.
*/
- png_uint_32 x_offset; /* x offset on page */
- png_uint_32 y_offset; /* y offset on page */
+ png_int_32 x_offset; /* x offset on page */
+ png_int_32 y_offset; /* y offset on page */
png_byte offset_unit_type; /* offset units type */
-#endif /* PNG_READ_oFFs_SUPPORTED || PNG_WRITE_oFFs_SUPPORTED */
-#if defined(PNG_READ_pHYs_SUPPORTED) || defined(PNG_WRITE_pHYs_SUPPORTED)
+#endif
+
+#if defined(PNG_pHYs_SUPPORTED)
/* The pHYs chunk gives the physical pixel density of the image for
* display or printing in "phys_unit_type" units (see PNG_RESOLUTION_
* defines below). Data is valid if (valid & PNG_INFO_pHYs) is non-zero.
png_uint_32 x_pixels_per_unit; /* horizontal pixel density */
png_uint_32 y_pixels_per_unit; /* vertical pixel density */
png_byte phys_unit_type; /* resolution type (see PNG_RESOLUTION_ below) */
-#endif /* PNG_READ_pHYs_SUPPORTED || PNG_WRITE_pHYs_SUPPORTED */
-#if defined(PNG_READ_hIST_SUPPORTED) || defined(PNG_WRITE_hIST_SUPPORTED)
+#endif
+
+#if defined(PNG_hIST_SUPPORTED)
/* The hIST chunk contains the relative frequency or importance of the
* various palette entries, so that a viewer can intelligently select a
* reduced-color palette, if required. Data is an array of "num_palette"
* is non-zero.
*/
png_uint_16p hist;
-#endif /* PNG_READ_hIST_SUPPORTED || PNG_WRITE_hIST_SUPPORTED */
-#if defined(PNG_READ_cHRM_SUPPORTED) || defined(PNG_WRITE_cHRM_SUPPORTED)
+#endif
+
+#ifdef PNG_cHRM_SUPPORTED
/* The cHRM chunk describes the CIE color characteristics of the monitor
* on which the PNG was created. This data allows the viewer to do gamut
* mapping of the input image to ensure that the viewer sees the same
* colors in the image as the creator. Values are in the range
* [0.0, 0.8]. Data valid if (valid & PNG_INFO_cHRM) non-zero.
*/
+#ifdef PNG_FLOATING_POINT_SUPPORTED
float x_white;
float y_white;
float x_red;
float y_green;
float x_blue;
float y_blue;
-#endif /* PNG_READ_cHRM_SUPPORTED || PNG_WRITE_cHRM_SUPPORTED */
-#if defined(PNG_READ_pCAL_SUPPORTED) || defined(PNG_WRITE_pCAL_SUPPORTED)
+#endif
+#endif
+
+#if defined(PNG_pCAL_SUPPORTED)
/* The pCAL chunk describes a transformation between the stored pixel
- * values and original physcical data values used to create the image.
+ * values and original physical data values used to create the image.
* The integer range [0, 2^bit_depth - 1] maps to the floating-point
* range given by [pcal_X0, pcal_X1], and are further transformed by a
* (possibly non-linear) transformation function given by "pcal_type"
* and "pcal_params" into "pcal_units". Please see the PNG_EQUATION_
- * defines below, and the PNG-Group's Scientific Visualization extension
- * chunks document png-scivis-19970203 for a complete description of the
- * transformations and how they should be implemented, as well as the
- * png-extensions document for a description of the ASCII parameter
- * strings. Data values are valid if (valid & PNG_INFO_pCAL) non-zero.
+ * defines below, and the PNG-Group's PNG extensions document for a
+ * complete description of the transformations and how they should be
+ * implemented, and for a description of the ASCII parameter strings.
+ * Data values are valid if (valid & PNG_INFO_pCAL) non-zero.
*/
png_charp pcal_purpose; /* pCAL chunk description string */
png_int_32 pcal_X0; /* minimum value */
png_charpp pcal_params; /* ASCII strings containing parameter values */
png_byte pcal_type; /* equation type (see PNG_EQUATION_ below) */
png_byte pcal_nparams; /* number of parameters given in pcal_params */
-#endif /* PNG_READ_pCAL_SUPPORTED || PNG_WRITE_pCAL_SUPPORTED */
+#endif
+
+/* New members added in libpng-1.0.6 */
+#ifdef PNG_FREE_ME_SUPPORTED
+ png_uint_32 free_me; /* flags items libpng is responsible for freeing */
+#endif
+
+#if defined(PNG_UNKNOWN_CHUNKS_SUPPORTED)
+ /* storage for unknown chunks that the library doesn't recognize. */
+ png_unknown_chunkp unknown_chunks;
+ png_size_t unknown_chunks_num;
+#endif
+
+#if defined(PNG_iCCP_SUPPORTED)
+ /* iCCP chunk data. */
+ png_charp iccp_name; /* profile name */
+ png_charp iccp_profile; /* International Color Consortium profile data */
+ /* Note to maintainer: should be png_bytep */
+ png_uint_32 iccp_proflen; /* ICC profile data length */
+ png_byte iccp_compression; /* Always zero */
+#endif
+
+#if defined(PNG_sPLT_SUPPORTED)
+ /* data on sPLT chunks (there may be more than one). */
+ png_sPLT_tp splt_palettes;
+ png_uint_32 splt_palettes_num;
+#endif
+
+#if defined(PNG_sCAL_SUPPORTED)
+ /* The sCAL chunk describes the actual physical dimensions of the
+ * subject matter of the graphic. The chunk contains a unit specification
+ * a byte value, and two ASCII strings representing floating-point
+ * values. The values are width and height corresponsing to one pixel
+ * in the image. This external representation is converted to double
+ * here. Data values are valid if (valid & PNG_INFO_sCAL) is non-zero.
+ */
+ png_byte scal_unit; /* unit of physical scale */
+#ifdef PNG_FLOATING_POINT_SUPPORTED
+ double scal_pixel_width; /* width of one pixel */
+ double scal_pixel_height; /* height of one pixel */
+#endif
+#ifdef PNG_FIXED_POINT_SUPPORTED
+ png_charp scal_s_width; /* string containing height */
+ png_charp scal_s_height; /* string containing width */
+#endif
+#endif
+
+#if defined(PNG_INFO_IMAGE_SUPPORTED)
+ /* Memory has been allocated if (valid & PNG_ALLOCATED_INFO_ROWS) non-zero */
+ /* Data valid if (valid & PNG_INFO_IDAT) non-zero */
+ png_bytepp row_pointers; /* the image bits */
+#endif
+
+#if defined(PNG_FIXED_POINT_SUPPORTED) && defined(PNG_gAMA_SUPPORTED)
+ png_fixed_point int_gamma; /* gamma of image, if (valid & PNG_INFO_gAMA) */
+#endif
+
+#if defined(PNG_cHRM_SUPPORTED) && defined(PNG_FIXED_POINT_SUPPORTED)
+ png_fixed_point int_x_white;
+ png_fixed_point int_y_white;
+ png_fixed_point int_x_red;
+ png_fixed_point int_y_red;
+ png_fixed_point int_x_green;
+ png_fixed_point int_y_green;
+ png_fixed_point int_x_blue;
+ png_fixed_point int_y_blue;
+#endif
+
} png_info;
+
typedef png_info FAR * png_infop;
typedef png_info FAR * FAR * png_infopp;
+/* Maximum positive integer used in PNG is (2^31)-1 */
+#define PNG_MAX_UINT ((png_uint_32)0x7fffffffL)
+
/* These describe the color_type field in png_info. */
/* color type masks */
#define PNG_COLOR_MASK_PALETTE 1
#define PNG_COLOR_TYPE_RGB (PNG_COLOR_MASK_COLOR)
#define PNG_COLOR_TYPE_RGB_ALPHA (PNG_COLOR_MASK_COLOR | PNG_COLOR_MASK_ALPHA)
#define PNG_COLOR_TYPE_GRAY_ALPHA (PNG_COLOR_MASK_ALPHA)
+/* aliases */
+#define PNG_COLOR_TYPE_RGBA PNG_COLOR_TYPE_RGB_ALPHA
+#define PNG_COLOR_TYPE_GA PNG_COLOR_TYPE_GRAY_ALPHA
-/* This is for compression type. PNG 1.0 only defines the single type. */
+/* This is for compression type. PNG 1.0-1.2 only define the single type. */
#define PNG_COMPRESSION_TYPE_BASE 0 /* Deflate method 8, 32K window */
#define PNG_COMPRESSION_TYPE_DEFAULT PNG_COMPRESSION_TYPE_BASE
-/* This is for filter type. PNG 1.0 only defines the single type. */
+/* This is for filter type. PNG 1.0-1.2 only define the single type. */
#define PNG_FILTER_TYPE_BASE 0 /* Single row per-byte filtering */
+#define PNG_INTRAPIXEL_DIFFERENCING 64 /* Used only in MNG datastreams */
#define PNG_FILTER_TYPE_DEFAULT PNG_FILTER_TYPE_BASE
/* These are for the interlacing type. These values should NOT be changed. */
#define PNG_EQUATION_HYPERBOLIC 3 /* Hyperbolic sine transformation */
#define PNG_EQUATION_LAST 4 /* Not a valid value */
+/* These are for the sCAL chunk. These values should NOT be changed. */
+#define PNG_SCALE_UNKNOWN 0 /* unknown unit (image scale) */
+#define PNG_SCALE_METER 1 /* meters per pixel */
+#define PNG_SCALE_RADIAN 2 /* radians per pixel */
+#define PNG_SCALE_LAST 3 /* Not a valid value */
+
/* These are for the pHYs chunk. These values should NOT be changed. */
#define PNG_RESOLUTION_UNKNOWN 0 /* pixels/unknown unit (aspect ratio) */
#define PNG_RESOLUTION_METER 1 /* pixels/meter */
#define PNG_RESOLUTION_LAST 2 /* Not a valid value */
/* These are for the sRGB chunk. These values should NOT be changed. */
-#define PNG_sRGB_INTENT_SATURATION 0
-#define PNG_sRGB_INTENT_PERCEPTUAL 1
-#define PNG_sRGB_INTENT_ABSOLUTE 2
-#define PNG_sRGB_INTENT_RELATIVE 3
+#define PNG_sRGB_INTENT_PERCEPTUAL 0
+#define PNG_sRGB_INTENT_RELATIVE 1
+#define PNG_sRGB_INTENT_SATURATION 2
+#define PNG_sRGB_INTENT_ABSOLUTE 3
#define PNG_sRGB_INTENT_LAST 4 /* Not a valid value */
+/* This is for text chunks */
+#define PNG_KEYWORD_MAX_LENGTH 79
+/* Maximum number of entries in PLTE/sPLT/tRNS arrays */
+#define PNG_MAX_PALETTE_LENGTH 256
/* These determine if an ancillary chunk's data has been successfully read
* from the PNG header, or if the application has filled in the corresponding
#define PNG_INFO_tIME 0x0200
#define PNG_INFO_pCAL 0x0400
#define PNG_INFO_sRGB 0x0800 /* GR-P, 0.96a */
+#define PNG_INFO_iCCP 0x1000 /* ESR, 1.0.6 */
+#define PNG_INFO_sPLT 0x2000 /* ESR, 1.0.6 */
+#define PNG_INFO_sCAL 0x4000 /* ESR, 1.0.6 */
+#define PNG_INFO_IDAT 0x8000L /* ESR, 1.0.6 */
/* This is used for the transformation routines, as some of them
* change these values for the row. It also should enable using
typedef struct png_struct_def png_struct;
typedef png_struct FAR * png_structp;
-typedef void (*png_error_ptr) PNGARG((png_structp, png_const_charp));
-typedef void (*png_rw_ptr) PNGARG((png_structp, png_bytep, png_size_t));
-typedef void (*png_flush_ptr) PNGARG((png_structp));
-typedef void (*png_read_status_ptr) PNGARG((png_structp, png_uint_32, int));
-typedef void (*png_write_status_ptr) PNGARG((png_structp, png_uint_32, int));
+typedef void (PNGAPI *png_error_ptr) PNGARG((png_structp, png_const_charp));
+typedef void (PNGAPI *png_rw_ptr) PNGARG((png_structp, png_bytep, png_size_t));
+typedef void (PNGAPI *png_flush_ptr) PNGARG((png_structp));
+typedef void (PNGAPI *png_read_status_ptr) PNGARG((png_structp, png_uint_32,
+ int));
+typedef void (PNGAPI *png_write_status_ptr) PNGARG((png_structp, png_uint_32,
+ int));
+
#ifdef PNG_PROGRESSIVE_READ_SUPPORTED
-typedef void (*png_progressive_info_ptr) PNGARG((png_structp, png_infop));
-typedef void (*png_progressive_end_ptr) PNGARG((png_structp, png_infop));
-typedef void (*png_progressive_row_ptr) PNGARG((png_structp, png_bytep,
+typedef void (PNGAPI *png_progressive_info_ptr) PNGARG((png_structp, png_infop));
+typedef void (PNGAPI *png_progressive_end_ptr) PNGARG((png_structp, png_infop));
+typedef void (PNGAPI *png_progressive_row_ptr) PNGARG((png_structp, png_bytep,
png_uint_32, int));
-#endif /* PNG_PROGRESSIVE_READ_SUPPORTED */
+#endif
#if defined(PNG_READ_USER_TRANSFORM_SUPPORTED) || \
- defined(PNG_WRITE_USER_TRANSFORM_SUPPORTED)
-typedef void (*png_user_transform_ptr) PNGARG((png_structp,
+ defined(PNG_WRITE_USER_TRANSFORM_SUPPORTED) || \
+ defined(PNG_LEGACY_SUPPORTED)
+typedef void (PNGAPI *png_user_transform_ptr) PNGARG((png_structp,
png_row_infop, png_bytep));
-#endif /* PNG_READ|WRITE_USER_TRANSFORM_SUPPORTED */
+#endif
+
+#if defined(PNG_USER_CHUNKS_SUPPORTED)
+typedef int (PNGAPI *png_user_chunk_ptr) PNGARG((png_structp, png_unknown_chunkp));
+#endif
+#if defined(PNG_UNKNOWN_CHUNKS_SUPPORTED)
+typedef void (PNGAPI *png_unknown_chunk_ptr) PNGARG((png_structp));
+#endif
+
+/* Transform masks for the high-level interface */
+#define PNG_TRANSFORM_IDENTITY 0x0000 /* read and write */
+#define PNG_TRANSFORM_STRIP_16 0x0001 /* read only */
+#define PNG_TRANSFORM_STRIP_ALPHA 0x0002 /* read only */
+#define PNG_TRANSFORM_PACKING 0x0004 /* read and write */
+#define PNG_TRANSFORM_PACKSWAP 0x0008 /* read and write */
+#define PNG_TRANSFORM_EXPAND 0x0010 /* read only */
+#define PNG_TRANSFORM_INVERT_MONO 0x0020 /* read and write */
+#define PNG_TRANSFORM_SHIFT 0x0040 /* read and write */
+#define PNG_TRANSFORM_BGR 0x0080 /* read and write */
+#define PNG_TRANSFORM_SWAP_ALPHA 0x0100 /* read and write */
+#define PNG_TRANSFORM_SWAP_ENDIAN 0x0200 /* read and write */
+#define PNG_TRANSFORM_INVERT_ALPHA 0x0400 /* read and write */
+#define PNG_TRANSFORM_STRIP_FILLER 0x0800 /* WRITE only */
+
+/* Flags for MNG supported features */
+#define PNG_FLAG_MNG_EMPTY_PLTE 0x01
+#define PNG_FLAG_MNG_FILTER_64 0x04
+#define PNG_ALL_MNG_FEATURES 0x05
typedef png_voidp (*png_malloc_ptr) PNGARG((png_structp, png_size_t));
-typedef void (*png_free_ptr) PNGARG((png_structp, png_structp));
+typedef void (*png_free_ptr) PNGARG((png_structp, png_voidp));
/* The structure that holds the information to read and write PNG files.
* The only people who need to care about what is inside of this are the
struct png_struct_def
{
+#ifdef PNG_SETJMP_SUPPORTED
jmp_buf jmpbuf; /* used in png_error */
-
+#endif
png_error_ptr error_fn; /* function for printing errors and aborting */
png_error_ptr warning_fn; /* function for printing warnings */
png_voidp error_ptr; /* user supplied struct for error functions */
png_rw_ptr write_data_fn; /* function for writing output data */
png_rw_ptr read_data_fn; /* function for reading input data */
-#if defined(PNG_READ_USER_TRANSFORM_SUPPORTED) || \
- defined(PNG_WRITE_USER_TRANSFORM_SUPPORTED)
+ png_voidp io_ptr; /* ptr to application struct for I/O functions */
+
+#if defined(PNG_READ_USER_TRANSFORM_SUPPORTED)
png_user_transform_ptr read_user_transform_fn; /* user read transform */
+#endif
+
+#if defined(PNG_WRITE_USER_TRANSFORM_SUPPORTED)
png_user_transform_ptr write_user_transform_fn; /* user write transform */
#endif
- png_voidp io_ptr; /* ptr to application struct for I/O functions*/
+
+/* These were added in libpng-1.0.2 */
+#if defined(PNG_USER_TRANSFORM_PTR_SUPPORTED)
+#if defined(PNG_READ_USER_TRANSFORM_SUPPORTED) || \
+ defined(PNG_WRITE_USER_TRANSFORM_SUPPORTED)
+ png_voidp user_transform_ptr; /* user supplied struct for user transform */
+ png_byte user_transform_depth; /* bit depth of user transformed pixels */
+ png_byte user_transform_channels; /* channels in user transformed pixels */
+#endif
+#endif
png_uint_32 mode; /* tells us where we are in the PNG file */
png_uint_32 flags; /* flags indicating various things to libpng */
png_byte sig_bytes; /* magic bytes read/written from start of file */
#if defined(PNG_READ_FILLER_SUPPORTED) || defined(PNG_WRITE_FILLER_SUPPORTED)
+#ifdef PNG_LEGACY_SUPPORTED
+ png_byte filler; /* filler byte for pixel expansion */
+#else
png_uint_16 filler; /* filler bytes for pixel expansion */
-#endif /* PNG_READ_FILLER_SUPPORTED */
-#if defined(PNG_READ_bKGD_SUPPORTED)
+#endif
+#endif
+
+#if defined(PNG_bKGD_SUPPORTED)
png_byte background_gamma_type;
+# ifdef PNG_FLOATING_POINT_SUPPORTED
float background_gamma;
+# endif
png_color_16 background; /* background color in screen gamma space */
#if defined(PNG_READ_GAMMA_SUPPORTED)
png_color_16 background_1; /* background normalized to gamma 1.0 */
-#endif /* PNG_READ_GAMMA && PNG_READ_bKGD_SUPPORTED */
-#endif /* PNG_READ_bKGD_SUPPORTED */
+#endif
+#endif /* PNG_bKGD_SUPPORTED */
+
#if defined(PNG_WRITE_FLUSH_SUPPORTED)
png_flush_ptr output_flush_fn;/* Function for flushing output */
png_uint_32 flush_dist; /* how many rows apart to flush, 0 - no flush */
png_uint_32 flush_rows; /* number of rows written since last flush */
-#endif /* PNG_WRITE_FLUSH_SUPPORTED */
+#endif
+
#if defined(PNG_READ_GAMMA_SUPPORTED) || defined(PNG_READ_BACKGROUND_SUPPORTED)
int gamma_shift; /* number of "insignificant" bits 16-bit gamma */
+#ifdef PNG_FLOATING_POINT_SUPPORTED
float gamma; /* file gamma value */
- float screen_gamma; /* screen gamma value (display_gamma/viewing_gamma */
-#endif /* PNG_READ_GAMMA_SUPPORTED */
+ float screen_gamma; /* screen gamma value (display_exponent) */
+#endif
+#endif
+
#if defined(PNG_READ_GAMMA_SUPPORTED) || defined(PNG_READ_BACKGROUND_SUPPORTED)
- png_bytep gamma_table; /* gamma table for 8 bit depth files */
+ png_bytep gamma_table; /* gamma table for 8-bit depth files */
png_bytep gamma_from_1; /* converts from 1.0 to screen */
png_bytep gamma_to_1; /* converts from file to 1.0 */
- png_uint_16pp gamma_16_table; /* gamma table for 16 bit depth files */
+ png_uint_16pp gamma_16_table; /* gamma table for 16-bit depth files */
png_uint_16pp gamma_16_from_1; /* converts from 1.0 to screen */
png_uint_16pp gamma_16_to_1; /* converts from file to 1.0 */
-#endif /* PNG_READ_GAMMA_SUPPORTED || PNG_WRITE_GAMMA_SUPPORTED */
-#if defined(PNG_READ_GAMMA_SUPPORTED) || defined (PNG_READ_sBIT_SUPPORTED)
+#endif
+
+#if defined(PNG_READ_GAMMA_SUPPORTED) || defined(PNG_sBIT_SUPPORTED)
png_color_8 sig_bit; /* significant bits in each available channel */
-#endif /* PNG_READ_GAMMA_SUPPORTED || PNG_READ_sBIT_SUPPORTED */
+#endif
+
#if defined(PNG_READ_SHIFT_SUPPORTED) || defined(PNG_WRITE_SHIFT_SUPPORTED)
png_color_8 shift; /* shift for significant bit tranformation */
-#endif /* PNG_READ_SHIFT_SUPPORTED || PNG_WRITE_SHIFT_SUPPORTED */
-#if defined(PNG_READ_tRNS_SUPPORTED) || defined(PNG_READ_BACKGROUND_SUPPORTED) \
+#endif
+
+#if defined(PNG_tRNS_SUPPORTED) || defined(PNG_READ_BACKGROUND_SUPPORTED) \
|| defined(PNG_READ_EXPAND_SUPPORTED) || defined(PNG_READ_BACKGROUND_SUPPORTED)
png_bytep trans; /* transparency values for paletted files */
png_color_16 trans_values; /* transparency values for non-paletted files */
-#endif /* PNG_READ|WRITE_tRNS_SUPPORTED||PNG_READ_EXPAND|BACKGROUND_SUPPORTED */
+#endif
+
png_read_status_ptr read_row_fn; /* called after each row is decoded */
png_write_status_ptr write_row_fn; /* called after each row is encoded */
#ifdef PNG_PROGRESSIVE_READ_SUPPORTED
png_size_t current_buffer_size; /* amount of data now in current_buffer */
int process_mode; /* what push library is currently doing */
int cur_palette; /* current push library palette index */
-#if defined(PNG_READ_tEXt_SUPPORTED) || defined(PNG_READ_zTXt_SUPPORTED)
- png_size_t current_text_size; /* current size of text input data */
- png_size_t current_text_left; /* how much text left to read in input */
- png_charp current_text; /* current text chunk buffer */
- png_charp current_text_ptr; /* current location in current_text */
-#endif /* PNG_PROGRESSIVE_READ_SUPPORTED && PNG_READ_tEXt/zTXt_SUPPORTED */
+
+# if defined(PNG_TEXT_SUPPORTED)
+ png_size_t current_text_size; /* current size of text input data */
+ png_size_t current_text_left; /* how much text left to read in input */
+ png_charp current_text; /* current text chunk buffer */
+ png_charp current_text_ptr; /* current location in current_text */
+# endif /* PNG_PROGRESSIVE_READ_SUPPORTED && PNG_TEXT_SUPPORTED */
+
#endif /* PNG_PROGRESSIVE_READ_SUPPORTED */
+
#if defined(__TURBOC__) && !defined(_Windows) && !defined(__FLAT__)
/* for the Borland special 64K segment handler */
png_bytepp offset_table_ptr;
png_uint_16 offset_table_number;
png_uint_16 offset_table_count;
png_uint_16 offset_table_count_free;
-#endif /* __TURBOC__&&!_Windows&&!__FLAT__ */
+#endif
+
#if defined(PNG_READ_DITHER_SUPPORTED)
png_bytep palette_lookup; /* lookup table for dithering */
png_bytep dither_index; /* index translation for palette files */
-#endif /* PNG_READ_DITHER_SUPPORTED */
-#if defined(PNG_READ_DITHER_SUPPORTED) || defined(PNG_READ_hIST_SUPPORTED)
+#endif
+
+#if defined(PNG_READ_DITHER_SUPPORTED) || defined(PNG_hIST_SUPPORTED)
png_uint_16p hist; /* histogram */
#endif
+
#if defined(PNG_WRITE_WEIGHTED_FILTER_SUPPORTED)
png_byte heuristic_method; /* heuristic for row filter selection */
png_byte num_prev_filters; /* number of weights for previous rows */
png_uint_16p inv_filter_weights; /* 1/weight(s) for previous line(s) */
png_uint_16p filter_costs; /* relative filter calculation cost */
png_uint_16p inv_filter_costs; /* 1/relative filter calculation cost */
-#endif /* PNG_WRITE_WEIGHTED_FILTER_SUPPORTED */
+#endif
+
#if defined(PNG_TIME_RFC1123_SUPPORTED)
png_charp time_buffer; /* String to hold RFC 1123 time text */
-#endif /* PNG_TIME_RFC1123_SUPPORTED */
+#endif
+
+/* New members added in libpng-1.0.6 */
+
+#ifdef PNG_FREE_ME_SUPPORTED
+ png_uint_32 free_me; /* flags items libpng is responsible for freeing */
+#endif
+
+#if defined(PNG_USER_CHUNKS_SUPPORTED)
+ png_voidp user_chunk_ptr;
+ png_user_chunk_ptr read_user_chunk_fn; /* user read chunk handler */
+#endif
+
+#if defined(PNG_UNKNOWN_CHUNKS_SUPPORTED)
+ int num_chunk_list;
+ png_bytep chunk_list;
+#endif
+
+/* New members added in libpng-1.0.3 */
+#if defined(PNG_READ_RGB_TO_GRAY_SUPPORTED)
+ png_byte rgb_to_gray_status;
+ /* These were changed from png_byte in libpng-1.0.6 */
+ png_uint_16 rgb_to_gray_red_coeff;
+ png_uint_16 rgb_to_gray_green_coeff;
+ png_uint_16 rgb_to_gray_blue_coeff;
+#endif
+
+/* New member added in libpng-1.0.4 (renamed in 1.0.9) */
+#if defined(PNG_MNG_FEATURES_SUPPORTED) || \
+ defined(PNG_READ_EMPTY_PLTE_SUPPORTED) || \
+ defined(PNG_WRITE_EMPTY_PLTE_SUPPORTED)
+/* changed from png_byte to png_uint_32 at version 1.2.0 */
+#ifdef PNG_1_0_X
+ png_byte mng_features_permitted;
+#else
+ png_uint_32 mng_features_permitted;
+#endif /* PNG_1_0_X */
+#endif
+
+/* New member added in libpng-1.0.7 */
+#if defined(PNG_READ_GAMMA_SUPPORTED) || defined(PNG_READ_BACKGROUND_SUPPORTED)
+ png_fixed_point int_gamma;
+#endif
+
+/* New member added in libpng-1.0.9, ifdef'ed out in 1.0.12, enabled in 1.2.0 */
+#if defined(PNG_MNG_FEATURES_SUPPORTED)
+ png_byte filter_type;
+#endif
+
+#if defined(PNG_1_0_X) || (defined(PNG_DEBUG) && defined(PNG_USE_PNGGCCRD))
+/* New member added in libpng-1.0.10, ifdef'ed out in 1.2.0 */
+ png_uint_32 row_buf_size;
+#endif
+
+/* New members added in libpng-1.2.0 */
+#if !defined(PNG_1_0_X) && defined(PNG_ASSEMBLER_CODE_SUPPORTED)
+ png_byte mmx_bitdepth_threshold;
+ png_uint_32 mmx_rowbytes_threshold;
+ png_uint_32 asm_flags;
+#endif
+
+/* New members added in libpng-1.0.2 but first enabled by default in 1.2.0 */
#ifdef PNG_USER_MEM_SUPPORTED
png_voidp mem_ptr; /* user supplied struct for mem functions */
png_malloc_ptr malloc_fn; /* function for allocating memory */
png_free_ptr free_fn; /* function for freeing memory */
-#endif /* PNG_USER_MEM_SUPPORTED */
-#if defined(PNG_READ_RGB_TO_GRAY_SUPPORTED)
- png_byte rgb_to_gray_status;
- png_byte rgb_to_gray_red_coeff;
- png_byte rgb_to_gray_green_coeff;
- png_byte rgb_to_gray_blue_coeff;
#endif
+
+/* New member added in libpng-1.0.13 and 1.2.0 */
+ png_bytep big_row_buf; /* buffer to save current (unfiltered) row */
+
+#if defined(PNG_READ_DITHER_SUPPORTED)
+/* The following three members were added at version 1.0.14 and 1.2.4 */
+ png_bytep dither_sort; /* working sort array */
+ png_bytep index_to_palette; /* where the original index currently is */
+ /* in the palette */
+ png_bytep palette_to_index; /* which original index points to this */
+ /* palette color */
+#endif
+
};
+
+/* This prevents a compiler error in png.c if png.c and png.h are both at
+ version 1.2.4
+ */
+typedef png_structp version_1_2_4;
+
typedef png_struct FAR * FAR * png_structpp;
/* Here are the function definitions most commonly used. This is not
* the place to find out how to use libpng. See libpng.txt for the
* full explanation, see example.c for the summary. This just provides
- * a simple one line of the use of each function.
+ * a simple one line description of the use of each function.
*/
+/* Returns the version number of the library */
+extern PNG_EXPORT(png_uint_32,png_access_version_number) PNGARG((void));
+
/* Tell lib we have already handled the first <num_bytes> magic bytes.
* Handling more than 8 bytes from the beginning of the file is an error.
*/
PNGARG((png_const_charp user_png_ver, png_voidp error_ptr,
png_error_ptr error_fn, png_error_ptr warn_fn));
+extern PNG_EXPORT(png_uint_32,png_get_compression_buffer_size)
+ PNGARG((png_structp png_ptr));
+
+extern PNG_EXPORT(void,png_set_compression_buffer_size)
+ PNGARG((png_structp png_ptr, png_uint_32 size));
+
+/* Reset the compression stream */
+extern PNG_EXPORT(int,png_reset_zstream) PNGARG((png_structp png_ptr));
+
+/* New functions added in libpng-1.0.2 (not enabled by default until 1.2.0) */
#ifdef PNG_USER_MEM_SUPPORTED
extern PNG_EXPORT(png_structp,png_create_read_struct_2)
PNGARG((png_const_charp user_png_ver, png_voidp error_ptr,
extern PNG_EXPORT(png_infop,png_create_info_struct)
PNGARG((png_structp png_ptr));
-/* Initialize the info structure (old interface - NOT DLL EXPORTED) */
-extern void png_info_init PNGARG((png_infop info_ptr));
+/* Initialize the info structure (old interface - DEPRECATED) */
+extern PNG_EXPORT(void,png_info_init) PNGARG((png_infop info_ptr));
+#undef png_info_init
+#define png_info_init(info_ptr) png_info_init_3(&info_ptr, sizeof(png_info));
+extern PNG_EXPORT(void,png_info_init_3) PNGARG((png_infopp info_ptr,
+ png_size_t png_info_struct_size));
/* Writes all the PNG information before the image. */
+extern PNG_EXPORT(void,png_write_info_before_PLTE) PNGARG((png_structp png_ptr,
+ png_infop info_ptr));
extern PNG_EXPORT(void,png_write_info) PNGARG((png_structp png_ptr,
png_infop info_ptr));
#if defined(PNG_TIME_RFC1123_SUPPORTED)
extern PNG_EXPORT(png_charp,png_convert_to_rfc1123)
PNGARG((png_structp png_ptr, png_timep ptime));
-#endif /* PNG_TIME_RFC1123_SUPPORTED */
+#endif
+#if !defined(_WIN32_WCE)
+/* "time.h" functions are not supported on WindowsCE */
#if defined(PNG_WRITE_tIME_SUPPORTED)
/* convert from a struct tm to png_time */
extern PNG_EXPORT(void,png_convert_from_struct_tm) PNGARG((png_timep ptime,
extern PNG_EXPORT(void,png_convert_from_time_t) PNGARG((png_timep ptime,
time_t ttime));
#endif /* PNG_WRITE_tIME_SUPPORTED */
+#endif /* _WIN32_WCE */
#if defined(PNG_READ_EXPAND_SUPPORTED)
-/* Expand data to 24 bit RGB, or 8 bit grayscale, with alpha if available. */
+/* Expand data to 24-bit RGB, or 8-bit grayscale, with alpha if available. */
extern PNG_EXPORT(void,png_set_expand) PNGARG((png_structp png_ptr));
-#endif /* PNG_READ_EXPAND_SUPPORTED */
+extern PNG_EXPORT(void,png_set_gray_1_2_4_to_8) PNGARG((png_structp png_ptr));
+extern PNG_EXPORT(void,png_set_palette_to_rgb) PNGARG((png_structp png_ptr));
+extern PNG_EXPORT(void,png_set_tRNS_to_alpha) PNGARG((png_structp png_ptr));
+#endif
#if defined(PNG_READ_BGR_SUPPORTED) || defined(PNG_WRITE_BGR_SUPPORTED)
/* Use blue, green, red order for pixels. */
extern PNG_EXPORT(void,png_set_bgr) PNGARG((png_structp png_ptr));
-#endif /* PNG_READ_BGR_SUPPORTED || PNG_WRITE_BGR_SUPPORTED */
+#endif
#if defined(PNG_READ_GRAY_TO_RGB_SUPPORTED)
-/* Expand the grayscale to 24 bit RGB if necessary. */
+/* Expand the grayscale to 24-bit RGB if necessary. */
extern PNG_EXPORT(void,png_set_gray_to_rgb) PNGARG((png_structp png_ptr));
-#endif /* PNG_READ_GRAY_TO_RGB_SUPPORTED */
+#endif
#if defined(PNG_READ_RGB_TO_GRAY_SUPPORTED)
/* Reduce RGB to grayscale. */
+#ifdef PNG_FLOATING_POINT_SUPPORTED
extern PNG_EXPORT(void,png_set_rgb_to_gray) PNGARG((png_structp png_ptr,
- int error_action, float red, float green ));
+ int error_action, double red, double green ));
+#endif
+extern PNG_EXPORT(void,png_set_rgb_to_gray_fixed) PNGARG((png_structp png_ptr,
+ int error_action, png_fixed_point red, png_fixed_point green ));
extern PNG_EXPORT(png_byte,png_get_rgb_to_gray_status) PNGARG((png_structp
png_ptr));
-#endif /* PNG_READ_RGB_TO_GRAY_SUPPORTED */
+#endif
extern PNG_EXPORT(void,png_build_grayscale_palette) PNGARG((int bit_depth,
png_colorp palette));
#if defined(PNG_READ_STRIP_ALPHA_SUPPORTED)
extern PNG_EXPORT(void,png_set_strip_alpha) PNGARG((png_structp png_ptr));
-#endif /* PNG_READ_STRIP_ALPHA_SUPPORTED */
+#endif
#if defined(PNG_READ_SWAP_ALPHA_SUPPORTED) || \
defined(PNG_WRITE_SWAP_ALPHA_SUPPORTED)
extern PNG_EXPORT(void,png_set_swap_alpha) PNGARG((png_structp png_ptr));
-#endif /* PNG_READ_SWAP_ALPHA_SUPPORTED || PNG_WRITE_SWAP_ALPHA_SUPPORTED */
+#endif
#if defined(PNG_READ_INVERT_ALPHA_SUPPORTED) || \
defined(PNG_WRITE_INVERT_ALPHA_SUPPORTED)
extern PNG_EXPORT(void,png_set_invert_alpha) PNGARG((png_structp png_ptr));
-#endif /* PNG_READ_INVERT_ALPHA_SUPPORTED || PNG_WRITE_INVERT_ALPHA_SUPPORTED */
+#endif
#if defined(PNG_READ_FILLER_SUPPORTED) || defined(PNG_WRITE_FILLER_SUPPORTED)
/* Add a filler byte to 24-bit RGB images. */
extern PNG_EXPORT(void,png_set_filler) PNGARG((png_structp png_ptr,
png_uint_32 filler, int flags));
-
/* The values of the PNG_FILLER_ defines should NOT be changed */
#define PNG_FILLER_BEFORE 0
#define PNG_FILLER_AFTER 1
#endif /* PNG_READ_FILLER_SUPPORTED || PNG_WRITE_FILLER_SUPPORTED */
#if defined(PNG_READ_SWAP_SUPPORTED) || defined(PNG_WRITE_SWAP_SUPPORTED)
-/* Swap bytes in 16 bit depth files. */
+/* Swap bytes in 16-bit depth files. */
extern PNG_EXPORT(void,png_set_swap) PNGARG((png_structp png_ptr));
-#endif /* PNG_READ_SWAP_SUPPORTED || PNG_WRITE_SWAP_SUPPORTED */
+#endif
#if defined(PNG_READ_PACK_SUPPORTED) || defined(PNG_WRITE_PACK_SUPPORTED)
-/* Use 1 byte per pixel in 1, 2, or 4 bit depth files. */
+/* Use 1 byte per pixel in 1, 2, or 4-bit depth files. */
extern PNG_EXPORT(void,png_set_packing) PNGARG((png_structp png_ptr));
-#endif /* PNG_READ_PACK_SUPPORTED || PNG_WRITE_PACK_SUPPORTED */
+#endif
#if defined(PNG_READ_PACKSWAP_SUPPORTED) || defined(PNG_WRITE_PACKSWAP_SUPPORTED)
/* Swap packing order of pixels in bytes. */
extern PNG_EXPORT(void,png_set_packswap) PNGARG((png_structp png_ptr));
-#endif /* PNG_READ_PACKSWAP_SUPPORTED || PNG_WRITE_PACKSWAP_SUPPOR */
+#endif
#if defined(PNG_READ_SHIFT_SUPPORTED) || defined(PNG_WRITE_SHIFT_SUPPORTED)
/* Converts files to legal bit depths. */
extern PNG_EXPORT(void,png_set_shift) PNGARG((png_structp png_ptr,
png_color_8p true_bits));
-#endif /* PNG_READ_SHIFT_SUPPORTED || PNG_WRITE_SHIFT_SUPPORTED */
+#endif
#if defined(PNG_READ_INTERLACING_SUPPORTED) || \
defined(PNG_WRITE_INTERLACING_SUPPORTED)
/* Have the code handle the interlacing. Returns the number of passes. */
extern PNG_EXPORT(int,png_set_interlace_handling) PNGARG((png_structp png_ptr));
-#endif /* PNG_READ_INTERLACING_SUPPORTED || PNG_WRITE_INTERLACING_SUPPORTED */
+#endif
#if defined(PNG_READ_INVERT_SUPPORTED) || defined(PNG_WRITE_INVERT_SUPPORTED)
-/* Invert monocrome files */
+/* Invert monochrome files */
extern PNG_EXPORT(void,png_set_invert_mono) PNGARG((png_structp png_ptr));
-#endif /* PNG_READ_INVERT_SUPPORTED || PNG_WRITE_INVERT_SUPPORTED */
+#endif
#if defined(PNG_READ_BACKGROUND_SUPPORTED)
/* Handle alpha and tRNS by replacing with a background color. */
+#ifdef PNG_FLOATING_POINT_SUPPORTED
extern PNG_EXPORT(void,png_set_background) PNGARG((png_structp png_ptr,
png_color_16p background_color, int background_gamma_code,
int need_expand, double background_gamma));
+#endif
#define PNG_BACKGROUND_GAMMA_UNKNOWN 0
#define PNG_BACKGROUND_GAMMA_SCREEN 1
#define PNG_BACKGROUND_GAMMA_FILE 2
#define PNG_BACKGROUND_GAMMA_UNIQUE 3
-#endif /* PNG_READ_BACKGROUND_SUPPORTED */
+#endif
#if defined(PNG_READ_16_TO_8_SUPPORTED)
-/* strip the second byte of information from a 16 bit depth file. */
+/* strip the second byte of information from a 16-bit depth file. */
extern PNG_EXPORT(void,png_set_strip_16) PNGARG((png_structp png_ptr));
-#endif /* PNG_READ_16_TO_8_SUPPORTED */
+#endif
#if defined(PNG_READ_DITHER_SUPPORTED)
/* Turn on dithering, and reduce the palette to the number of colors available. */
extern PNG_EXPORT(void,png_set_dither) PNGARG((png_structp png_ptr,
png_colorp palette, int num_palette, int maximum_colors,
png_uint_16p histogram, int full_dither));
-#endif /* PNG_READ_DITHER_SUPPORTED */
+#endif
#if defined(PNG_READ_GAMMA_SUPPORTED)
-/* Handle gamma correction. Screen_gamma=(display_gamma/viewing_gamma) */
+/* Handle gamma correction. Screen_gamma=(display_exponent) */
+#ifdef PNG_FLOATING_POINT_SUPPORTED
extern PNG_EXPORT(void,png_set_gamma) PNGARG((png_structp png_ptr,
double screen_gamma, double default_file_gamma));
-#endif /* PNG_READ_GAMMA_SUPPORTED */
+#endif
+#endif
+
+#if defined(PNG_READ_EMPTY_PLTE_SUPPORTED) || \
+ defined(PNG_WRITE_EMPTY_PLTE_SUPPORTED)
+/* Permit or disallow empty PLTE (0: not permitted, 1: permitted) */
+/* Deprecated and will be removed. Use png_permit_mng_features() instead. */
+extern PNG_EXPORT(void,png_permit_empty_plte) PNGARG((png_structp png_ptr,
+ int empty_plte_permitted));
+#endif
#if defined(PNG_WRITE_FLUSH_SUPPORTED)
/* Set how many lines between output flushes - 0 for no flushing */
extern PNG_EXPORT(void,png_set_flush) PNGARG((png_structp png_ptr, int nrows));
-
/* Flush the current PNG output buffer */
extern PNG_EXPORT(void,png_write_flush) PNGARG((png_structp png_ptr));
-#endif /* PNG_WRITE_FLUSH_SUPPORTED */
+#endif
/* optional update palette with requested transformations */
extern PNG_EXPORT(void,png_start_read_image) PNGARG((png_structp png_ptr));
extern PNG_EXPORT(void,png_read_update_info) PNGARG((png_structp png_ptr,
png_infop info_ptr));
-/* read a one or more rows of image data.*/
+/* read one or more rows of image data. */
extern PNG_EXPORT(void,png_read_rows) PNGARG((png_structp png_ptr,
png_bytepp row, png_bytepp display_row, png_uint_32 num_rows));
-/* read a row of data.*/
+/* read a row of data. */
extern PNG_EXPORT(void,png_read_row) PNGARG((png_structp png_ptr,
png_bytep row,
png_bytep display_row));
extern PNG_EXPORT(void,png_destroy_write_struct)
PNGARG((png_structpp png_ptr_ptr, png_infopp info_ptr_ptr));
-/* free any memory used in info_ptr struct (old method - NOT DLL EXPORTED) */
-extern void png_write_destroy_info PNGARG((png_infop info_ptr));
-
/* free any memory used in png_ptr struct (old method - NOT DLL EXPORTED) */
extern void png_write_destroy PNGARG((png_structp png_ptr));
* the weights and costs are set to 1.0, this degenerates the WEIGHTED method
* to the UNWEIGHTED method, but with added encoding time/computation.
*/
+#ifdef PNG_FLOATING_POINT_SUPPORTED
extern PNG_EXPORT(void,png_set_filter_heuristics) PNGARG((png_structp png_ptr,
int heuristic_method, int num_weights, png_doublep filter_weights,
png_doublep filter_costs));
+#endif
#endif /* PNG_WRITE_WEIGHTED_FILTER_SUPPORTED */
/* Heuristic used for row filter selection. These defines should NOT be
#if !defined(PNG_NO_STDIO)
/* Initialize the input/output for the PNG file to the default functions. */
-extern PNG_EXPORT(void,png_init_io) PNGARG((png_structp png_ptr, FILE *fp));
+extern PNG_EXPORT(void,png_init_io) PNGARG((png_structp png_ptr, png_FILE_p fp));
#endif
/* Replace the (error and abort), and warning functions with user
/* Replace the default memory allocation functions with user supplied one(s). */
extern PNG_EXPORT(void,png_set_mem_fn) PNGARG((png_structp png_ptr,
png_voidp mem_ptr, png_malloc_ptr malloc_fn, png_free_ptr free_fn));
-
/* Return the user pointer associated with the memory functions */
extern PNG_EXPORT(png_voidp,png_get_mem_ptr) PNGARG((png_structp png_ptr));
-#endif /* PNG_USER_MEM_SUPPORTED */
+#endif
-#ifdef PNG_READ_USER_TRANSFORM_SUPPORTED
+#if defined(PNG_READ_USER_TRANSFORM_SUPPORTED) || \
+ defined(PNG_LEGACY_SUPPORTED)
extern PNG_EXPORT(void,png_set_read_user_transform_fn) PNGARG((png_structp
png_ptr, png_user_transform_ptr read_user_transform_fn));
#endif
-#ifdef PNG_WRITE_USER_TRANSFORM_SUPPORTED
+#if defined(PNG_WRITE_USER_TRANSFORM_SUPPORTED) || \
+ defined(PNG_LEGACY_SUPPORTED)
extern PNG_EXPORT(void,png_set_write_user_transform_fn) PNGARG((png_structp
png_ptr, png_user_transform_ptr write_user_transform_fn));
#endif
+#if defined(PNG_READ_USER_TRANSFORM_SUPPORTED) || \
+ defined(PNG_WRITE_USER_TRANSFORM_SUPPORTED) || \
+ defined(PNG_LEGACY_SUPPORTED)
+extern PNG_EXPORT(void,png_set_user_transform_info) PNGARG((png_structp
+ png_ptr, png_voidp user_transform_ptr, int user_transform_depth,
+ int user_transform_channels));
+/* Return the user pointer associated with the user transform functions */
+extern PNG_EXPORT(png_voidp,png_get_user_transform_ptr)
+ PNGARG((png_structp png_ptr));
+#endif
+
+#ifdef PNG_USER_CHUNKS_SUPPORTED
+extern PNG_EXPORT(void,png_set_read_user_chunk_fn) PNGARG((png_structp png_ptr,
+ png_voidp user_chunk_ptr, png_user_chunk_ptr read_user_chunk_fn));
+extern PNG_EXPORT(png_voidp,png_get_user_chunk_ptr) PNGARG((png_structp
+ png_ptr));
+#endif
+
#ifdef PNG_PROGRESSIVE_READ_SUPPORTED
/* Sets the function callbacks for the push reader, and a pointer to a
* user-defined structure available to the callback functions.
extern PNG_EXPORT(png_voidp,png_malloc) PNGARG((png_structp png_ptr,
png_uint_32 size));
+#if defined(PNG_1_0_X)
+# define png_malloc_warn png_malloc
+#else
+/* Added at libpng version 1.2.4 */
+extern PNG_EXPORT(png_voidp,png_malloc_warn) PNGARG((png_structp png_ptr,
+ png_uint_32 size));
+#endif
+
/* frees a pointer allocated by png_malloc() */
extern PNG_EXPORT(void,png_free) PNGARG((png_structp png_ptr, png_voidp ptr));
+#if defined(PNG_1_0_X)
+/* Function to allocate memory for zlib. */
+extern PNG_EXPORT(voidpf,png_zalloc) PNGARG((voidpf png_ptr, uInt items,
+ uInt size));
+
+/* Function to free memory for zlib */
+extern PNG_EXPORT(void,png_zfree) PNGARG((voidpf png_ptr, voidpf ptr));
+#endif
+
+/* Free data that was allocated internally */
+extern PNG_EXPORT(void,png_free_data) PNGARG((png_structp png_ptr,
+ png_infop info_ptr, png_uint_32 free_me, int num));
+#ifdef PNG_FREE_ME_SUPPORTED
+/* Reassign responsibility for freeing existing data, whether allocated
+ * by libpng or by the application */
+extern PNG_EXPORT(void,png_data_freer) PNGARG((png_structp png_ptr,
+ png_infop info_ptr, int freer, png_uint_32 mask));
+#endif
+/* assignments for png_data_freer */
+#define PNG_DESTROY_WILL_FREE_DATA 1
+#define PNG_SET_WILL_FREE_DATA 1
+#define PNG_USER_WILL_FREE_DATA 2
+/* Flags for png_ptr->free_me and info_ptr->free_me */
+#define PNG_FREE_HIST 0x0008
+#define PNG_FREE_ICCP 0x0010
+#define PNG_FREE_SPLT 0x0020
+#define PNG_FREE_ROWS 0x0040
+#define PNG_FREE_PCAL 0x0080
+#define PNG_FREE_SCAL 0x0100
+#define PNG_FREE_UNKN 0x0200
+#define PNG_FREE_LIST 0x0400
+#define PNG_FREE_PLTE 0x1000
+#define PNG_FREE_TRNS 0x2000
+#define PNG_FREE_TEXT 0x4000
+#define PNG_FREE_ALL 0x7fff
+#define PNG_FREE_MUL 0x4220 /* PNG_FREE_SPLT|PNG_FREE_TEXT|PNG_FREE_UNKN */
+
#ifdef PNG_USER_MEM_SUPPORTED
extern PNG_EXPORT(png_voidp,png_malloc_default) PNGARG((png_structp png_ptr,
png_uint_32 size));
extern PNG_EXPORT(void,png_free_default) PNGARG((png_structp png_ptr,
png_voidp ptr));
-#endif /* PNG_USER_MEM_SUPPORTED */
+#endif
extern PNG_EXPORT(png_voidp,png_memcpy_check) PNGARG((png_structp png_ptr,
png_voidp s1, png_voidp s2, png_uint_32 size));
/* Fatal error in PNG image of libpng - can't continue */
extern PNG_EXPORT(void,png_error) PNGARG((png_structp png_ptr,
- png_const_charp error));
+ png_const_charp error_message));
/* The same, but the chunk name is prepended to the error string. */
extern PNG_EXPORT(void,png_chunk_error) PNGARG((png_structp png_ptr,
- png_const_charp error));
+ png_const_charp error_message));
/* Non-fatal error in libpng. Can continue, but may have a problem. */
extern PNG_EXPORT(void,png_warning) PNGARG((png_structp png_ptr,
- png_const_charp message));
+ png_const_charp warning_message));
/* Non-fatal error in libpng, chunk name is prepended to message. */
extern PNG_EXPORT(void,png_chunk_warning) PNGARG((png_structp png_ptr,
- png_const_charp message));
+ png_const_charp warning_message));
/* The png_set_<chunk> functions are for storing values in the png_info_struct.
* Similarly, the png_get_<chunk> calls are used to read values from the
extern PNG_EXPORT(png_uint_32,png_get_rowbytes) PNGARG((png_structp png_ptr,
png_infop info_ptr));
+#if defined(PNG_INFO_IMAGE_SUPPORTED)
+/* Returns row_pointers, which is an array of pointers to scanlines that was
+returned from png_read_png(). */
+extern PNG_EXPORT(png_bytepp,png_get_rows) PNGARG((png_structp png_ptr,
+png_infop info_ptr));
+/* Set row_pointers, which is an array of pointers to scanlines for use
+by png_write_png(). */
+extern PNG_EXPORT(void,png_set_rows) PNGARG((png_structp png_ptr,
+ png_infop info_ptr, png_bytepp row_pointers));
+#endif
+
/* Returns number of color channels in image. */
extern PNG_EXPORT(png_byte,png_get_channels) PNGARG((png_structp png_ptr,
png_infop info_ptr));
png_ptr, png_infop info_ptr));
/* Returns pixel aspect ratio, computed from pHYs chunk data. */
+#ifdef PNG_FLOATING_POINT_SUPPORTED
extern PNG_EXPORT(float, png_get_pixel_aspect_ratio) PNGARG((png_structp
png_ptr, png_infop info_ptr));
+#endif
/* Returns image x, y offset in pixels or microns, from oFFs chunk data. */
-extern PNG_EXPORT(png_uint_32, png_get_x_offset_pixels) PNGARG((png_structp
+extern PNG_EXPORT(png_int_32, png_get_x_offset_pixels) PNGARG((png_structp
png_ptr, png_infop info_ptr));
-extern PNG_EXPORT(png_uint_32, png_get_y_offset_pixels) PNGARG((png_structp
+extern PNG_EXPORT(png_int_32, png_get_y_offset_pixels) PNGARG((png_structp
png_ptr, png_infop info_ptr));
-extern PNG_EXPORT(png_uint_32, png_get_x_offset_microns) PNGARG((png_structp
+extern PNG_EXPORT(png_int_32, png_get_x_offset_microns) PNGARG((png_structp
png_ptr, png_infop info_ptr));
-extern PNG_EXPORT(png_uint_32, png_get_y_offset_microns) PNGARG((png_structp
+extern PNG_EXPORT(png_int_32, png_get_y_offset_microns) PNGARG((png_structp
png_ptr, png_infop info_ptr));
#endif /* PNG_EASY_ACCESS_SUPPORTED */
extern PNG_EXPORT(png_bytep,png_get_signature) PNGARG((png_structp png_ptr,
png_infop info_ptr));
-#if defined(PNG_READ_bKGD_SUPPORTED)
+#if defined(PNG_bKGD_SUPPORTED)
extern PNG_EXPORT(png_uint_32,png_get_bKGD) PNGARG((png_structp png_ptr,
png_infop info_ptr, png_color_16p *background));
-#endif /* PNG_READ_bKGD_SUPPORTED */
+#endif
-#if defined(PNG_READ_bKGD_SUPPORTED) || defined(PNG_WRITE_bKGD_SUPPORTED)
+#if defined(PNG_bKGD_SUPPORTED)
extern PNG_EXPORT(void,png_set_bKGD) PNGARG((png_structp png_ptr,
png_infop info_ptr, png_color_16p background));
-#endif /* PNG_READ_bKGD_SUPPORTED || PNG_WRITE_bKGD_SUPPORTED */
+#endif
-#if defined(PNG_READ_cHRM_SUPPORTED)
+#if defined(PNG_cHRM_SUPPORTED)
+#ifdef PNG_FLOATING_POINT_SUPPORTED
extern PNG_EXPORT(png_uint_32,png_get_cHRM) PNGARG((png_structp png_ptr,
png_infop info_ptr, double *white_x, double *white_y, double *red_x,
double *red_y, double *green_x, double *green_y, double *blue_x,
double *blue_y));
-#endif /* PNG_READ_cHRM_SUPPORTED */
+#endif
+#ifdef PNG_FIXED_POINT_SUPPORTED
+extern PNG_EXPORT(png_uint_32,png_get_cHRM_fixed) PNGARG((png_structp png_ptr,
+ png_infop info_ptr, png_fixed_point *int_white_x, png_fixed_point
+ *int_white_y, png_fixed_point *int_red_x, png_fixed_point *int_red_y,
+ png_fixed_point *int_green_x, png_fixed_point *int_green_y, png_fixed_point
+ *int_blue_x, png_fixed_point *int_blue_y));
+#endif
+#endif
-#if defined(PNG_READ_cHRM_SUPPORTED) || defined(PNG_WRITE_cHRM_SUPPORTED)
+#if defined(PNG_cHRM_SUPPORTED)
+#ifdef PNG_FLOATING_POINT_SUPPORTED
extern PNG_EXPORT(void,png_set_cHRM) PNGARG((png_structp png_ptr,
png_infop info_ptr, double white_x, double white_y, double red_x,
double red_y, double green_x, double green_y, double blue_x, double blue_y));
-#endif /* PNG_READ_cHRM_SUPPORTED || PNG_WRITE_cHRM_SUPPORTED */
+#endif
+#ifdef PNG_FIXED_POINT_SUPPORTED
+extern PNG_EXPORT(void,png_set_cHRM_fixed) PNGARG((png_structp png_ptr,
+ png_infop info_ptr, png_fixed_point int_white_x, png_fixed_point int_white_y,
+ png_fixed_point int_red_x, png_fixed_point int_red_y, png_fixed_point
+ int_green_x, png_fixed_point int_green_y, png_fixed_point int_blue_x,
+ png_fixed_point int_blue_y));
+#endif
+#endif
-#if defined(PNG_READ_gAMA_SUPPORTED)
+#if defined(PNG_gAMA_SUPPORTED)
+#ifdef PNG_FLOATING_POINT_SUPPORTED
extern PNG_EXPORT(png_uint_32,png_get_gAMA) PNGARG((png_structp png_ptr,
png_infop info_ptr, double *file_gamma));
-#endif /* PNG_READ_gAMA_SUPPORTED */
+#endif
+extern PNG_EXPORT(png_uint_32,png_get_gAMA_fixed) PNGARG((png_structp png_ptr,
+ png_infop info_ptr, png_fixed_point *int_file_gamma));
+#endif
-#if defined(PNG_READ_gAMA_SUPPORTED) || defined(PNG_WRITE_gAMA_SUPPORTED)
+#if defined(PNG_gAMA_SUPPORTED)
+#ifdef PNG_FLOATING_POINT_SUPPORTED
extern PNG_EXPORT(void,png_set_gAMA) PNGARG((png_structp png_ptr,
png_infop info_ptr, double file_gamma));
-#endif /* PNG_READ_gAMA_SUPPORTED || PNG_WRITE_gAMA_SUPPORTED */
+#endif
+extern PNG_EXPORT(void,png_set_gAMA_fixed) PNGARG((png_structp png_ptr,
+ png_infop info_ptr, png_fixed_point int_file_gamma));
+#endif
-#if defined(PNG_READ_hIST_SUPPORTED)
+#if defined(PNG_hIST_SUPPORTED)
extern PNG_EXPORT(png_uint_32,png_get_hIST) PNGARG((png_structp png_ptr,
png_infop info_ptr, png_uint_16p *hist));
-#endif /* PNG_READ_hIST_SUPPORTED */
+#endif
-#if defined(PNG_READ_hIST_SUPPORTED) || defined(PNG_WRITE_hIST_SUPPORTED)
+#if defined(PNG_hIST_SUPPORTED)
extern PNG_EXPORT(void,png_set_hIST) PNGARG((png_structp png_ptr,
png_infop info_ptr, png_uint_16p hist));
-#endif /* PNG_READ_hIST_SUPPORTED || PNG_WRITE_hIST_SUPPORTED */
+#endif
extern PNG_EXPORT(png_uint_32,png_get_IHDR) PNGARG((png_structp png_ptr,
png_infop info_ptr, png_uint_32 *width, png_uint_32 *height,
- int *bit_depth, int *color_type, int *interlace_type,
- int *compression_type, int *filter_type));
+ int *bit_depth, int *color_type, int *interlace_method,
+ int *compression_method, int *filter_method));
extern PNG_EXPORT(void,png_set_IHDR) PNGARG((png_structp png_ptr,
png_infop info_ptr, png_uint_32 width, png_uint_32 height, int bit_depth,
- int color_type, int interlace_type, int compression_type, int filter_type));
+ int color_type, int interlace_method, int compression_method,
+ int filter_method));
-#if defined(PNG_READ_oFFs_SUPPORTED)
+#if defined(PNG_oFFs_SUPPORTED)
extern PNG_EXPORT(png_uint_32,png_get_oFFs) PNGARG((png_structp png_ptr,
- png_infop info_ptr, png_uint_32 *offset_x, png_uint_32 *offset_y,
+ png_infop info_ptr, png_int_32 *offset_x, png_int_32 *offset_y,
int *unit_type));
-#endif /* PNG_READ_oFFs_SUPPORTED */
+#endif
-#if defined(PNG_READ_oFFs_SUPPORTED) || defined(PNG_WRITE_oFFs_SUPPORTED)
+#if defined(PNG_oFFs_SUPPORTED)
extern PNG_EXPORT(void,png_set_oFFs) PNGARG((png_structp png_ptr,
- png_infop info_ptr, png_uint_32 offset_x, png_uint_32 offset_y,
+ png_infop info_ptr, png_int_32 offset_x, png_int_32 offset_y,
int unit_type));
-#endif /* PNG_READ_oFFs_SUPPORTED || PNG_WRITE_oFFs_SUPPORTED */
+#endif
-#if defined(PNG_READ_pCAL_SUPPORTED)
+#if defined(PNG_pCAL_SUPPORTED)
extern PNG_EXPORT(png_uint_32,png_get_pCAL) PNGARG((png_structp png_ptr,
png_infop info_ptr, png_charp *purpose, png_int_32 *X0, png_int_32 *X1,
int *type, int *nparams, png_charp *units, png_charpp *params));
-#endif /* PNG_READ_pCAL_SUPPORTED */
+#endif
-#if defined(PNG_READ_pCAL_SUPPORTED) || defined(PNG_WRITE_pCAL_SUPPORTED)
+#if defined(PNG_pCAL_SUPPORTED)
extern PNG_EXPORT(void,png_set_pCAL) PNGARG((png_structp png_ptr,
png_infop info_ptr, png_charp purpose, png_int_32 X0, png_int_32 X1,
int type, int nparams, png_charp units, png_charpp params));
-#endif /* PNG_READ_pCAL_SUPPORTED || PNG_WRITE_pCAL_SUPPORTED */
+#endif
-#if defined(PNG_READ_pHYs_SUPPORTED)
+#if defined(PNG_pHYs_SUPPORTED)
extern PNG_EXPORT(png_uint_32,png_get_pHYs) PNGARG((png_structp png_ptr,
png_infop info_ptr, png_uint_32 *res_x, png_uint_32 *res_y, int *unit_type));
-#endif /* PNG_READ_pHYs_SUPPORTED */
+#endif
-#if defined(PNG_READ_pHYs_SUPPORTED) || defined(PNG_WRITE_pHYs_SUPPORTED)
+#if defined(PNG_pHYs_SUPPORTED)
extern PNG_EXPORT(void,png_set_pHYs) PNGARG((png_structp png_ptr,
png_infop info_ptr, png_uint_32 res_x, png_uint_32 res_y, int unit_type));
-#endif /* PNG_READ_pHYs_SUPPORTED || PNG_WRITE_pHYs_SUPPORTED */
+#endif
extern PNG_EXPORT(png_uint_32,png_get_PLTE) PNGARG((png_structp png_ptr,
png_infop info_ptr, png_colorp *palette, int *num_palette));
extern PNG_EXPORT(void,png_set_PLTE) PNGARG((png_structp png_ptr,
png_infop info_ptr, png_colorp palette, int num_palette));
-#if defined(PNG_READ_sBIT_SUPPORTED)
+#if defined(PNG_sBIT_SUPPORTED)
extern PNG_EXPORT(png_uint_32,png_get_sBIT) PNGARG((png_structp png_ptr,
png_infop info_ptr, png_color_8p *sig_bit));
-#endif /* PNG_READ_sBIT_SUPPORTED */
+#endif
-#if defined(PNG_READ_sBIT_SUPPORTED) || defined(PNG_WRITE_sBIT_SUPPORTED)
+#if defined(PNG_sBIT_SUPPORTED)
extern PNG_EXPORT(void,png_set_sBIT) PNGARG((png_structp png_ptr,
png_infop info_ptr, png_color_8p sig_bit));
-#endif /* PNG_READ_sBIT_SUPPORTED || PNG_WRITE_sBIT_SUPPORTED */
+#endif
-#if defined(PNG_READ_sRGB_SUPPORTED)
+#if defined(PNG_sRGB_SUPPORTED)
extern PNG_EXPORT(png_uint_32,png_get_sRGB) PNGARG((png_structp png_ptr,
png_infop info_ptr, int *intent));
-#endif /* PNG_READ_sRGB_SUPPORTED */
+#endif
-#if defined(PNG_READ_sRGB_SUPPORTED) || defined(PNG_WRITE_sRGB_SUPPORTED)
+#if defined(PNG_sRGB_SUPPORTED)
extern PNG_EXPORT(void,png_set_sRGB) PNGARG((png_structp png_ptr,
png_infop info_ptr, int intent));
extern PNG_EXPORT(void,png_set_sRGB_gAMA_and_cHRM) PNGARG((png_structp png_ptr,
png_infop info_ptr, int intent));
-#endif /* PNG_READ_sRGB_SUPPORTED || PNG_WRITE_sRGB_SUPPORTED */
+#endif
-#if defined(PNG_READ_tEXt_SUPPORTED) || defined(PNG_READ_zTXt_SUPPORTED)
-/* png_get_text also returns the number of text chunks in text_ptr */
+#if defined(PNG_iCCP_SUPPORTED)
+extern PNG_EXPORT(png_uint_32,png_get_iCCP) PNGARG((png_structp png_ptr,
+ png_infop info_ptr, png_charpp name, int *compression_type,
+ png_charpp profile, png_uint_32 *proflen));
+ /* Note to maintainer: profile should be png_bytepp */
+#endif
+
+#if defined(PNG_iCCP_SUPPORTED)
+extern PNG_EXPORT(void,png_set_iCCP) PNGARG((png_structp png_ptr,
+ png_infop info_ptr, png_charp name, int compression_type,
+ png_charp profile, png_uint_32 proflen));
+ /* Note to maintainer: profile should be png_bytep */
+#endif
+
+#if defined(PNG_sPLT_SUPPORTED)
+extern PNG_EXPORT(png_uint_32,png_get_sPLT) PNGARG((png_structp png_ptr,
+ png_infop info_ptr, png_sPLT_tpp entries));
+#endif
+
+#if defined(PNG_sPLT_SUPPORTED)
+extern PNG_EXPORT(void,png_set_sPLT) PNGARG((png_structp png_ptr,
+ png_infop info_ptr, png_sPLT_tp entries, int nentries));
+#endif
+
+#if defined(PNG_TEXT_SUPPORTED)
+/* png_get_text also returns the number of text chunks in *num_text */
extern PNG_EXPORT(png_uint_32,png_get_text) PNGARG((png_structp png_ptr,
png_infop info_ptr, png_textp *text_ptr, int *num_text));
-#endif /* PNG_READ_tEXt_SUPPORTED || PNG_READ_zTXt_SUPPORTED */
+#endif
+
+/*
+ * Note while png_set_text() will accept a structure whose text,
+ * language, and translated keywords are NULL pointers, the structure
+ * returned by png_get_text will always contain regular
+ * zero-terminated C strings. They might be empty strings but
+ * they will never be NULL pointers.
+ */
-#if defined(PNG_READ_tEXt_SUPPORTED) || defined(PNG_WRITE_tEXt_SUPPORTED) || \
- defined(PNG_READ_zTXt_SUPPORTED) || defined(PNG_WRITE_zTXt_SUPPORTED)
+#if defined(PNG_TEXT_SUPPORTED)
extern PNG_EXPORT(void,png_set_text) PNGARG((png_structp png_ptr,
png_infop info_ptr, png_textp text_ptr, int num_text));
-#endif /* PNG_READ_OR_WRITE_tEXt_OR_zTXt_SUPPORTED */
+#endif
-#if defined(PNG_READ_tIME_SUPPORTED)
+#if defined(PNG_tIME_SUPPORTED)
extern PNG_EXPORT(png_uint_32,png_get_tIME) PNGARG((png_structp png_ptr,
png_infop info_ptr, png_timep *mod_time));
-#endif /* PNG_READ_tIME_SUPPORTED */
+#endif
-#if defined(PNG_READ_tIME_SUPPORTED) || defined(PNG_WRITE_tIME_SUPPORTED)
+#if defined(PNG_tIME_SUPPORTED)
extern PNG_EXPORT(void,png_set_tIME) PNGARG((png_structp png_ptr,
png_infop info_ptr, png_timep mod_time));
-#endif /* PNG_READ_tIME_SUPPORTED || PNG_WRITE_tIME_SUPPORTED */
+#endif
-#if defined(PNG_READ_tRNS_SUPPORTED)
+#if defined(PNG_tRNS_SUPPORTED)
extern PNG_EXPORT(png_uint_32,png_get_tRNS) PNGARG((png_structp png_ptr,
png_infop info_ptr, png_bytep *trans, int *num_trans,
png_color_16p *trans_values));
-#endif /* PNG_READ_tRNS_SUPPORTED */
+#endif
-#if defined(PNG_READ_tRNS_SUPPORTED) || defined(PNG_WRITE_tRNS_SUPPORTED)
+#if defined(PNG_tRNS_SUPPORTED)
extern PNG_EXPORT(void,png_set_tRNS) PNGARG((png_structp png_ptr,
png_infop info_ptr, png_bytep trans, int num_trans,
png_color_16p trans_values));
-#endif /* PNG_READ_tRNS_SUPPORTED || PNG_WRITE_tRNS_SUPPORTED */
+#endif
+
+#if defined(PNG_tRNS_SUPPORTED)
+#endif
+
+#if defined(PNG_sCAL_SUPPORTED)
+#ifdef PNG_FLOATING_POINT_SUPPORTED
+extern PNG_EXPORT(png_uint_32,png_get_sCAL) PNGARG((png_structp png_ptr,
+ png_infop info_ptr, int *unit, double *width, double *height));
+#else
+#ifdef PNG_FIXED_POINT_SUPPORTED
+extern PNG_EXPORT(png_uint_32,png_get_sCAL_s) PNGARG((png_structp png_ptr,
+ png_infop info_ptr, int *unit, png_charpp swidth, png_charpp sheight));
+#endif
+#endif
+#endif /* PNG_sCAL_SUPPORTED */
+
+#if defined(PNG_sCAL_SUPPORTED)
+#ifdef PNG_FLOATING_POINT_SUPPORTED
+extern PNG_EXPORT(void,png_set_sCAL) PNGARG((png_structp png_ptr,
+ png_infop info_ptr, int unit, double width, double height));
+#endif
+#ifdef PNG_FIXED_POINT_SUPPORTED
+extern PNG_EXPORT(void,png_set_sCAL_s) PNGARG((png_structp png_ptr,
+ png_infop info_ptr, int unit, png_charp swidth, png_charp sheight));
+#endif
+#endif /* PNG_sCAL_SUPPORTED || PNG_WRITE_sCAL_SUPPORTED */
+
+#if defined(PNG_UNKNOWN_CHUNKS_SUPPORTED)
+/* provide a list of chunks and how they are to be handled, if the built-in
+ handling or default unknown chunk handling is not desired. Any chunks not
+ listed will be handled in the default manner. The IHDR and IEND chunks
+ must not be listed.
+ keep = 0: follow default behavour
+ = 1: do not keep
+ = 2: keep only if safe-to-copy
+ = 3: keep even if unsafe-to-copy
+*/
+extern PNG_EXPORT(void, png_set_keep_unknown_chunks) PNGARG((png_structp
+ png_ptr, int keep, png_bytep chunk_list, int num_chunks));
+extern PNG_EXPORT(void, png_set_unknown_chunks) PNGARG((png_structp png_ptr,
+ png_infop info_ptr, png_unknown_chunkp unknowns, int num_unknowns));
+extern PNG_EXPORT(void, png_set_unknown_chunk_location)
+ PNGARG((png_structp png_ptr, png_infop info_ptr, int chunk, int location));
+extern PNG_EXPORT(png_uint_32,png_get_unknown_chunks) PNGARG((png_structp
+ png_ptr, png_infop info_ptr, png_unknown_chunkpp entries));
+#endif
+#ifdef PNG_HANDLE_AS_UNKNOWN_SUPPORTED
+PNG_EXPORT(int,png_handle_as_unknown) PNGARG((png_structp png_ptr, png_bytep
+ chunk_name));
+#endif
+
+/* Png_free_data() will turn off the "valid" flag for anything it frees.
+ If you need to turn it off for a chunk that your application has freed,
+ you can use png_set_invalid(png_ptr, info_ptr, PNG_INFO_CHNK); */
+extern PNG_EXPORT(void, png_set_invalid) PNGARG((png_structp png_ptr,
+ png_infop info_ptr, int mask));
+
+#if defined(PNG_INFO_IMAGE_SUPPORTED)
+/* The "params" pointer is currently not used and is for future expansion. */
+extern PNG_EXPORT(void, png_read_png) PNGARG((png_structp png_ptr,
+ png_infop info_ptr,
+ int transforms,
+ png_voidp params));
+extern PNG_EXPORT(void, png_write_png) PNGARG((png_structp png_ptr,
+ png_infop info_ptr,
+ int transforms,
+ png_voidp params));
+#endif
/* Define PNG_DEBUG at compile time for debugging information. Higher
* numbers for PNG_DEBUG mean more debugging information. This has
*/
#ifdef PNG_DEBUG
#if (PNG_DEBUG > 0)
+#if !defined(PNG_DEBUG_FILE) && defined(_MSC_VER)
+#include <crtdbg.h>
+#if (PNG_DEBUG > 1)
+#define png_debug(l,m) _RPT0(_CRT_WARN,m)
+#define png_debug1(l,m,p1) _RPT1(_CRT_WARN,m,p1)
+#define png_debug2(l,m,p1,p2) _RPT2(_CRT_WARN,m,p1,p2)
+#endif
+#else /* PNG_DEBUG_FILE || !_MSC_VER */
#ifndef PNG_DEBUG_FILE
#define PNG_DEBUG_FILE stderr
#endif /* PNG_DEBUG_FILE */
-
-#define png_debug(l,m) if (PNG_DEBUG > l) \
- fprintf(PNG_DEBUG_FILE,"%s"m,(l==1 ? "\t" : \
- (l==2 ? "\t\t":(l>2 ? "\t\t\t":""))))
-#define png_debug1(l,m,p1) if (PNG_DEBUG > l) \
- fprintf(PNG_DEBUG_FILE,"%s"m,(l==1 ? "\t" : \
- (l==2 ? "\t\t":(l>2 ? "\t\t\t":""))),p1)
-#define png_debug2(l,m,p1,p2) if (PNG_DEBUG > l) \
- fprintf(PNG_DEBUG_FILE,"%s"m,(l==1 ? "\t" : \
- (l==2 ? "\t\t":(l>2 ? "\t\t\t":""))),p1,p2)
+#if (PNG_DEBUG > 1)
+#define png_debug(l,m) \
+{ \
+ int num_tabs=l; \
+ fprintf(PNG_DEBUG_FILE,"%s"m,(num_tabs==1 ? "\t" : \
+ (num_tabs==2 ? "\t\t":(num_tabs>2 ? "\t\t\t":"")))); \
+}
+#define png_debug1(l,m,p1) \
+{ \
+ int num_tabs=l; \
+ fprintf(PNG_DEBUG_FILE,"%s"m,(num_tabs==1 ? "\t" : \
+ (num_tabs==2 ? "\t\t":(num_tabs>2 ? "\t\t\t":""))),p1); \
+}
+#define png_debug2(l,m,p1,p2) \
+{ \
+ int num_tabs=l; \
+ fprintf(PNG_DEBUG_FILE,"%s"m,(num_tabs==1 ? "\t" : \
+ (num_tabs==2 ? "\t\t":(num_tabs>2 ? "\t\t\t":""))),p1,p2); \
+}
+#endif /* (PNG_DEBUG > 1) */
+#endif /* _MSC_VER */
#endif /* (PNG_DEBUG > 0) */
#endif /* PNG_DEBUG */
#ifndef png_debug
#define png_debug2(l, m, p1, p2)
#endif
+extern PNG_EXPORT(png_bytep,png_sig_bytes) PNGARG((void));
+
extern PNG_EXPORT(png_charp,png_get_copyright) PNGARG((png_structp png_ptr));
+extern PNG_EXPORT(png_charp,png_get_header_ver) PNGARG((png_structp png_ptr));
extern PNG_EXPORT(png_charp,png_get_header_version) PNGARG((png_structp png_ptr));
+extern PNG_EXPORT(png_charp,png_get_libpng_ver) PNGARG((png_structp png_ptr));
+
+#ifdef PNG_MNG_FEATURES_SUPPORTED
+extern PNG_EXPORT(png_uint_32,png_permit_mng_features) PNGARG((png_structp
+ png_ptr, png_uint_32 mng_features_permitted));
+#endif
+
+/* Added to version 1.2.0 */
+#if defined(PNG_ASSEMBLER_CODE_SUPPORTED)
+#define PNG_ASM_FLAG_MMX_SUPPORT_COMPILED 0x01 /* not user-settable */
+#define PNG_ASM_FLAG_MMX_SUPPORT_IN_CPU 0x02 /* not user-settable */
+#define PNG_ASM_FLAG_MMX_READ_COMBINE_ROW 0x04
+#define PNG_ASM_FLAG_MMX_READ_INTERLACE 0x08
+#define PNG_ASM_FLAG_MMX_READ_FILTER_SUB 0x10
+#define PNG_ASM_FLAG_MMX_READ_FILTER_UP 0x20
+#define PNG_ASM_FLAG_MMX_READ_FILTER_AVG 0x40
+#define PNG_ASM_FLAG_MMX_READ_FILTER_PAETH 0x80
+#define PNG_ASM_FLAGS_INITIALIZED 0x80000000 /* not user-settable */
+
+#define PNG_MMX_READ_FLAGS ( PNG_ASM_FLAG_MMX_READ_COMBINE_ROW \
+ | PNG_ASM_FLAG_MMX_READ_INTERLACE \
+ | PNG_ASM_FLAG_MMX_READ_FILTER_SUB \
+ | PNG_ASM_FLAG_MMX_READ_FILTER_UP \
+ | PNG_ASM_FLAG_MMX_READ_FILTER_AVG \
+ | PNG_ASM_FLAG_MMX_READ_FILTER_PAETH )
+#define PNG_MMX_WRITE_FLAGS ( 0 )
+
+#define PNG_MMX_FLAGS ( PNG_ASM_FLAG_MMX_SUPPORT_COMPILED \
+ | PNG_ASM_FLAG_MMX_SUPPORT_IN_CPU \
+ | PNG_MMX_READ_FLAGS \
+ | PNG_MMX_WRITE_FLAGS )
+
+#define PNG_SELECT_READ 1
+#define PNG_SELECT_WRITE 2
+
+
+#if !defined(PNG_1_0_X)
+/* pngget.c */
+extern PNG_EXPORT(png_uint_32,png_get_mmx_flagmask)
+ PNGARG((int flag_select, int *compilerID));
+
+/* pngget.c */
+extern PNG_EXPORT(png_uint_32,png_get_asm_flagmask)
+ PNGARG((int flag_select));
+
+/* pngget.c */
+extern PNG_EXPORT(png_uint_32,png_get_asm_flags)
+ PNGARG((png_structp png_ptr));
-#ifdef PNG_NO_EXTERN
-/* this only gets included in png.c */
-png_charp
-png_get_header_version(png_structp png_ptr)
-{
- if(png_ptr == NULL)
- /* silence compiler warning about unused png_ptr */ ;
- return("\n libpng version 1.0.3 - January 14, 1999 (header)\n");
-}
+/* pngget.c */
+extern PNG_EXPORT(png_byte,png_get_mmx_bitdepth_threshold)
+ PNGARG((png_structp png_ptr));
+
+/* pngget.c */
+extern PNG_EXPORT(png_uint_32,png_get_mmx_rowbytes_threshold)
+ PNGARG((png_structp png_ptr));
+
+/* pngset.c */
+extern PNG_EXPORT(void,png_set_asm_flags)
+ PNGARG((png_structp png_ptr, png_uint_32 asm_flags));
+
+/* pngset.c */
+extern PNG_EXPORT(void,png_set_mmx_thresholds)
+ PNGARG((png_structp png_ptr, png_byte mmx_bitdepth_threshold,
+ png_uint_32 mmx_rowbytes_threshold));
+
+#endif /* PNG_1_0_X */
+#endif /* PNG_ASSEMBLER_CODE_SUPPORTED */
+
+#if !defined(PNG_1_0_X)
+/* png.c, pnggccrd.c, or pngvcrd.c */
+extern PNG_EXPORT(int,png_mmx_support) PNGARG((void));
+
+/* Strip the prepended error numbers ("#nnn ") from error and warning
+ * messages before passing them to the error or warning handler. */
+#ifdef PNG_ERROR_NUMBERS_SUPPORTED
+extern PNG_EXPORT(void,png_set_strip_error_numbers) PNGARG((png_structp
+ png_ptr, png_uint_32 strip_mode));
#endif
+#endif /* PNG_1_0_X */
+
+/* Maintainer: Put new public prototypes here ^, in libpng.3, and project defs */
+
+#define PNG_HEADER_VERSION_STRING \
+ " libpng version 1.2.4 - July 8, 2002 (header)\n"
#ifdef PNG_READ_COMPOSITE_NODIV_SUPPORTED
/* With these routines we avoid an integer divide, which will be slower on
/* fg and bg should be in `gamma 1.0' space; alpha is the opacity */
# define png_composite(composite, fg, alpha, bg) \
- { png_uint_16 temp = ((png_uint_16)(fg) * (png_uint_16)(alpha) + \
- (png_uint_16)(bg)*(png_uint_16)(255 - \
+ { png_uint_16 temp = (png_uint_16)((png_uint_16)(fg) * (png_uint_16)(alpha) \
+ + (png_uint_16)(bg)*(png_uint_16)(255 - \
(png_uint_16)(alpha)) + (png_uint_16)128); \
(composite) = (png_byte)((temp + (temp >> 8)) >> 8); }
# define png_composite_16(composite, fg, alpha, bg) \
- { png_uint_32 temp = ((png_uint_32)(fg) * (png_uint_32)(alpha) + \
- (png_uint_32)(bg)*(png_uint_32)(65535L - \
+ { png_uint_32 temp = (png_uint_32)((png_uint_32)(fg) * (png_uint_32)(alpha) \
+ + (png_uint_32)(bg)*(png_uint_32)(65535L - \
(png_uint_32)(alpha)) + (png_uint_32)32768L); \
(composite) = (png_uint_16)((temp + (temp >> 16)) >> 16); }
/* Various modes of operation. Note that after an init, mode is set to
* zero automatically when the structure is created.
*/
-#define PNG_BEFORE_IHDR 0x00
-#define PNG_HAVE_IHDR 0x01
-#define PNG_HAVE_PLTE 0x02
-#define PNG_HAVE_IDAT 0x04
-#define PNG_AFTER_IDAT 0x08
-#define PNG_HAVE_IEND 0x10
-#define PNG_HAVE_gAMA 0x20
-#define PNG_HAVE_cHRM 0x40
-#define PNG_HAVE_sRGB 0x80
-
-/* push model modes */
-#define PNG_READ_SIG_MODE 0
-#define PNG_READ_CHUNK_MODE 1
-#define PNG_READ_IDAT_MODE 2
-#define PNG_SKIP_MODE 3
-#define PNG_READ_tEXt_MODE 4
-#define PNG_READ_zTXt_MODE 5
-#define PNG_READ_DONE_MODE 6
-#define PNG_ERROR_MODE 7
+#define PNG_HAVE_IHDR 0x01
+#define PNG_HAVE_PLTE 0x02
+#define PNG_HAVE_IDAT 0x04
+#define PNG_AFTER_IDAT 0x08
+#define PNG_HAVE_IEND 0x10
+#define PNG_HAVE_gAMA 0x20
+#define PNG_HAVE_cHRM 0x40
+#define PNG_HAVE_sRGB 0x80
+#define PNG_HAVE_CHUNK_HEADER 0x100
+#define PNG_WROTE_tIME 0x200
+#define PNG_WROTE_INFO_BEFORE_PLTE 0x400
+#define PNG_BACKGROUND_IS_GRAY 0x800
+#define PNG_HAVE_PNG_SIGNATURE 0x1000
/* flags for the transformations the PNG library does on the image data */
#define PNG_BGR 0x0001
#define PNG_EXPAND 0x1000
#define PNG_GAMMA 0x2000
#define PNG_GRAY_TO_RGB 0x4000
-#define PNG_FILLER 0x8000
+#define PNG_FILLER 0x8000L
#define PNG_PACKSWAP 0x10000L
#define PNG_SWAP_ALPHA 0x20000L
#define PNG_STRIP_ALPHA 0x40000L
#define PNG_FLAG_CRC_ANCILLARY_NOWARN 0x0200
#define PNG_FLAG_CRC_CRITICAL_USE 0x0400
#define PNG_FLAG_CRC_CRITICAL_IGNORE 0x0800
-#define PNG_FLAG_FREE_PALETTE 0x1000
-#define PNG_FLAG_FREE_TRANS 0x2000
+#define PNG_FLAG_FREE_PLTE 0x1000
+#define PNG_FLAG_FREE_TRNS 0x2000
#define PNG_FLAG_FREE_HIST 0x4000
-#define PNG_FLAG_HAVE_CHUNK_HEADER 0x8000L
-#define PNG_FLAG_WROTE_tIME 0x10000L
-#define PNG_FLAG_BACKGROUND_IS_GRAY 0x20000L
+#define PNG_FLAG_KEEP_UNKNOWN_CHUNKS 0x8000L
+#define PNG_FLAG_KEEP_UNSAFE_CHUNKS 0x10000L
+#define PNG_FLAG_LIBRARY_MISMATCH 0x20000L
+#define PNG_FLAG_STRIP_ERROR_NUMBERS 0x40000L
+#define PNG_FLAG_STRIP_ERROR_TEXT 0x80000L
+#define PNG_FLAG_MALLOC_NULL_MEM_OK 0x100000L
+
+/* For use in png_set_keep_unknown, png_handle_as_unknown */
+#define HANDLE_CHUNK_AS_DEFAULT 0
+#define HANDLE_CHUNK_NEVER 1
+#define HANDLE_CHUNK_IF_SAFE 2
+#define HANDLE_CHUNK_ALWAYS 3
#define PNG_FLAG_CRC_ANCILLARY_MASK (PNG_FLAG_CRC_ANCILLARY_USE | \
PNG_FLAG_CRC_ANCILLARY_NOWARN)
/* variables declared in png.c - only it needs to define PNG_NO_EXTERN */
#if !defined(PNG_NO_EXTERN) || defined(PNG_ALWAYS_EXTERN)
/* place to hold the signature string for a PNG file. */
-extern png_byte FARDATA png_sig[8];
+#ifdef PNG_USE_GLOBAL_ARRAYS
+ PNG_EXPORT_VAR (const png_byte FARDATA) png_sig[8];
+#else
+#define png_sig png_sig_bytes(NULL)
+#endif
+#endif /* PNG_NO_EXTERN */
/* Constant strings for known chunk types. If you need to add a chunk,
- * add a string holding the name here. See png.c for more details. We
- * can't selectively include these, since we still check for chunk in the
- * wrong locations with these labels.
+ * define the name here, and add an invocation of the macro in png.c and
+ * wherever it's needed.
*/
-extern png_byte FARDATA png_IHDR[5];
-extern png_byte FARDATA png_IDAT[5];
-extern png_byte FARDATA png_IEND[5];
-extern png_byte FARDATA png_PLTE[5];
-extern png_byte FARDATA png_bKGD[5];
-extern png_byte FARDATA png_cHRM[5];
-extern png_byte FARDATA png_gAMA[5];
-extern png_byte FARDATA png_hIST[5];
-extern png_byte FARDATA png_oFFs[5];
-extern png_byte FARDATA png_pCAL[5];
-extern png_byte FARDATA png_pHYs[5];
-extern png_byte FARDATA png_sBIT[5];
-extern png_byte FARDATA png_sRGB[5];
-extern png_byte FARDATA png_tEXt[5];
-extern png_byte FARDATA png_tIME[5];
-extern png_byte FARDATA png_tRNS[5];
-extern png_byte FARDATA png_zTXt[5];
+#define PNG_IHDR const png_byte png_IHDR[5] = { 73, 72, 68, 82, '\0'}
+#define PNG_IDAT const png_byte png_IDAT[5] = { 73, 68, 65, 84, '\0'}
+#define PNG_IEND const png_byte png_IEND[5] = { 73, 69, 78, 68, '\0'}
+#define PNG_PLTE const png_byte png_PLTE[5] = { 80, 76, 84, 69, '\0'}
+#define PNG_bKGD const png_byte png_bKGD[5] = { 98, 75, 71, 68, '\0'}
+#define PNG_cHRM const png_byte png_cHRM[5] = { 99, 72, 82, 77, '\0'}
+#define PNG_gAMA const png_byte png_gAMA[5] = {103, 65, 77, 65, '\0'}
+#define PNG_hIST const png_byte png_hIST[5] = {104, 73, 83, 84, '\0'}
+#define PNG_iCCP const png_byte png_iCCP[5] = {105, 67, 67, 80, '\0'}
+#define PNG_iTXt const png_byte png_iTXt[5] = {105, 84, 88, 116, '\0'}
+#define PNG_oFFs const png_byte png_oFFs[5] = {111, 70, 70, 115, '\0'}
+#define PNG_pCAL const png_byte png_pCAL[5] = {112, 67, 65, 76, '\0'}
+#define PNG_sCAL const png_byte png_sCAL[5] = {115, 67, 65, 76, '\0'}
+#define PNG_pHYs const png_byte png_pHYs[5] = {112, 72, 89, 115, '\0'}
+#define PNG_sBIT const png_byte png_sBIT[5] = {115, 66, 73, 84, '\0'}
+#define PNG_sPLT const png_byte png_sPLT[5] = {115, 80, 76, 84, '\0'}
+#define PNG_sRGB const png_byte png_sRGB[5] = {115, 82, 71, 66, '\0'}
+#define PNG_tEXt const png_byte png_tEXt[5] = {116, 69, 88, 116, '\0'}
+#define PNG_tIME const png_byte png_tIME[5] = {116, 73, 77, 69, '\0'}
+#define PNG_tRNS const png_byte png_tRNS[5] = {116, 82, 78, 83, '\0'}
+#define PNG_zTXt const png_byte png_zTXt[5] = {122, 84, 88, 116, '\0'}
+
+#ifdef PNG_USE_GLOBAL_ARRAYS
+PNG_EXPORT_VAR (const png_byte FARDATA) png_IHDR[5];
+PNG_EXPORT_VAR (const png_byte FARDATA) png_IDAT[5];
+PNG_EXPORT_VAR (const png_byte FARDATA) png_IEND[5];
+PNG_EXPORT_VAR (const png_byte FARDATA) png_PLTE[5];
+PNG_EXPORT_VAR (const png_byte FARDATA) png_bKGD[5];
+PNG_EXPORT_VAR (const png_byte FARDATA) png_cHRM[5];
+PNG_EXPORT_VAR (const png_byte FARDATA) png_gAMA[5];
+PNG_EXPORT_VAR (const png_byte FARDATA) png_hIST[5];
+PNG_EXPORT_VAR (const png_byte FARDATA) png_iCCP[5];
+PNG_EXPORT_VAR (const png_byte FARDATA) png_iTXt[5];
+PNG_EXPORT_VAR (const png_byte FARDATA) png_oFFs[5];
+PNG_EXPORT_VAR (const png_byte FARDATA) png_pCAL[5];
+PNG_EXPORT_VAR (const png_byte FARDATA) png_sCAL[5];
+PNG_EXPORT_VAR (const png_byte FARDATA) png_pHYs[5];
+PNG_EXPORT_VAR (const png_byte FARDATA) png_sBIT[5];
+PNG_EXPORT_VAR (const png_byte FARDATA) png_sPLT[5];
+PNG_EXPORT_VAR (const png_byte FARDATA) png_sRGB[5];
+PNG_EXPORT_VAR (const png_byte FARDATA) png_tEXt[5];
+PNG_EXPORT_VAR (const png_byte FARDATA) png_tIME[5];
+PNG_EXPORT_VAR (const png_byte FARDATA) png_tRNS[5];
+PNG_EXPORT_VAR (const png_byte FARDATA) png_zTXt[5];
+#endif /* PNG_USE_GLOBAL_ARRAYS */
-#endif /* PNG_NO_EXTERN */
/* Inline macros to do direct reads of bytes from the input buffer. These
* require that you are using an architecture that uses PNG byte ordering
* values, which is almost certainly true.
*/
#if defined(PNG_READ_BIG_ENDIAN_SUPPORTED)
-#if defined(PNG_READ_pCAL_SUPPORTED)
-#define png_get_int_32(buf) ( *((png_int_32p) (buf)))
-#endif /* PNG_READ_pCAL_SUPPORTED */
-#define png_get_uint_32(buf) ( *((png_uint_32p) (buf)))
-#define png_get_uint_16(buf) ( *((png_uint_16p) (buf)))
+# if defined(PNG_pCAL_SUPPORTED) || defined(PNG_oFFs_SUPPORTED)
+# define png_get_int_32(buf) ( *((png_int_32p) (buf)))
+# endif
+# define png_get_uint_32(buf) ( *((png_uint_32p) (buf)))
+# define png_get_uint_16(buf) ( *((png_uint_16p) (buf)))
#else
-#if defined(PNG_READ_pCAL_SUPPORTED)
+# if defined(PNG_pCAL_SUPPORTED) || defined(PNG_oFFs_SUPPORTED)
PNG_EXTERN png_int_32 png_get_int_32 PNGARG((png_bytep buf));
-#endif /* PNG_READ_pCAL_SUPPORTED */
+# endif
PNG_EXTERN png_uint_32 png_get_uint_32 PNGARG((png_bytep buf));
PNG_EXTERN png_uint_16 png_get_uint_16 PNGARG((png_bytep buf));
-#endif /* PNG_READ_BIG_ENDIAN_SUPPORTED */
+#endif /* !PNG_READ_BIG_ENDIAN_SUPPORTED */
/* Initialize png_ptr struct for reading, and allocate any other memory.
- * (old interface - NOT DLL EXPORTED).
+ * (old interface - DEPRECATED - use png_create_read_struct instead).
*/
-extern void png_read_init PNGARG((png_structp png_ptr));
+extern PNG_EXPORT(void,png_read_init) PNGARG((png_structp png_ptr));
+#undef png_read_init
+#define png_read_init(png_ptr) png_read_init_3(&png_ptr, \
+ PNG_LIBPNG_VER_STRING, sizeof(png_struct));
+extern PNG_EXPORT(void,png_read_init_3) PNGARG((png_structpp ptr_ptr,
+ png_const_charp user_png_ver, png_size_t png_struct_size));
+extern PNG_EXPORT(void,png_read_init_2) PNGARG((png_structp png_ptr,
+ png_const_charp user_png_ver, png_size_t png_struct_size, png_size_t
+ png_info_size));
/* Initialize png_ptr struct for writing, and allocate any other memory.
- * (old interface - NOT DLL EXPORTED).
+ * (old interface - DEPRECATED - use png_create_write_struct instead).
*/
-extern void png_write_init PNGARG((png_structp png_ptr));
-
-/* allocate memory for an internal libpng struct */
+extern PNG_EXPORT(void,png_write_init) PNGARG((png_structp png_ptr));
+#undef png_write_init
+#define png_write_init(png_ptr) png_write_init_3(&png_ptr, \
+ PNG_LIBPNG_VER_STRING, sizeof(png_struct));
+extern PNG_EXPORT(void,png_write_init_3) PNGARG((png_structpp ptr_ptr,
+ png_const_charp user_png_ver, png_size_t png_struct_size));
+extern PNG_EXPORT(void,png_write_init_2) PNGARG((png_structp png_ptr,
+ png_const_charp user_png_ver, png_size_t png_struct_size, png_size_t
+ png_info_size));
+
+/* Allocate memory for an internal libpng struct */
PNG_EXTERN png_voidp png_create_struct PNGARG((int type));
-/* free memory from internal libpng struct */
+/* Free memory from internal libpng struct */
PNG_EXTERN void png_destroy_struct PNGARG((png_voidp struct_ptr));
PNG_EXTERN png_voidp png_create_struct_2 PNGARG((int type, png_malloc_ptr
- malloc_fn));
+ malloc_fn, png_voidp mem_ptr));
PNG_EXTERN void png_destroy_struct_2 PNGARG((png_voidp struct_ptr,
- png_free_ptr free_fn));
+ png_free_ptr free_fn, png_voidp mem_ptr));
-/* free any memory that info_ptr points to and reset struct. */
+/* Free any memory that info_ptr points to and reset struct. */
PNG_EXTERN void png_info_destroy PNGARG((png_structp png_ptr,
png_infop info_ptr));
+#ifndef PNG_1_0_X
/* Function to allocate memory for zlib. */
PNG_EXTERN voidpf png_zalloc PNGARG((voidpf png_ptr, uInt items, uInt size));
-/* function to free memory for zlib */
+/* Function to free memory for zlib */
PNG_EXTERN void png_zfree PNGARG((voidpf png_ptr, voidpf ptr));
-/* reset the CRC variable */
+/* Next four functions are used internally as callbacks. PNGAPI is required
+ * but not PNG_EXPORT. PNGAPI added at libpng version 1.2.3. */
+
+PNG_EXTERN void PNGAPI png_default_read_data PNGARG((png_structp png_ptr,
+ png_bytep data, png_size_t length));
+
+#ifdef PNG_PROGRESSIVE_READ_SUPPORTED
+PNG_EXTERN void PNGAPI png_push_fill_buffer PNGARG((png_structp png_ptr,
+ png_bytep buffer, png_size_t length));
+#endif
+
+PNG_EXTERN void PNGAPI png_default_write_data PNGARG((png_structp png_ptr,
+ png_bytep data, png_size_t length));
+
+#if defined(PNG_WRITE_FLUSH_SUPPORTED)
+#if !defined(PNG_NO_STDIO)
+PNG_EXTERN void PNGAPI png_default_flush PNGARG((png_structp png_ptr));
+#endif
+#endif
+#else /* PNG_1_0_X */
+#ifdef PNG_PROGRESSIVE_READ_SUPPORTED
+PNG_EXTERN void png_push_fill_buffer PNGARG((png_structp png_ptr,
+ png_bytep buffer, png_size_t length));
+#endif
+#endif /* PNG_1_0_X */
+
+/* Reset the CRC variable */
PNG_EXTERN void png_reset_crc PNGARG((png_structp png_ptr));
/* Write the "data" buffer to whatever output you are using. */
PNG_EXTERN void png_read_data PNGARG((png_structp png_ptr, png_bytep data,
png_size_t length));
-/* read bytes into buf, and update png_ptr->crc */
+/* Read bytes into buf, and update png_ptr->crc */
PNG_EXTERN void png_crc_read PNGARG((png_structp png_ptr, png_bytep buf,
png_size_t length));
-/* read "skip" bytes, read the file crc, and (optionally) verify png_ptr->crc */
+/* Decompress data in a chunk that uses compression */
+#if defined(PNG_zTXt_SUPPORTED) || defined(PNG_iTXt_SUPPORTED) || \
+ defined(PNG_iCCP_SUPPORTED) || defined(PNG_sPLT_SUPPORTED)
+PNG_EXTERN png_charp png_decompress_chunk PNGARG((png_structp png_ptr,
+ int comp_type, png_charp chunkdata, png_size_t chunklength,
+ png_size_t prefix_length, png_size_t *data_length));
+#endif
+
+/* Read "skip" bytes, read the file crc, and (optionally) verify png_ptr->crc */
PNG_EXTERN int png_crc_finish PNGARG((png_structp png_ptr, png_uint_32 skip));
-/* read the CRC from the file and compare it to the libpng calculated CRC */
+/* Read the CRC from the file and compare it to the libpng calculated CRC */
PNG_EXTERN int png_crc_error PNGARG((png_structp png_ptr));
/* Calculate the CRC over a section of data. Note that we are only
PNG_EXTERN void png_flush PNGARG((png_structp png_ptr));
#endif
+
/* Place a 32-bit number into a buffer in PNG byte order (big-endian).
* The only currently known PNG chunks that use signed numbers are
* the ancillary extension chunks, oFFs and pCAL.
*/
PNG_EXTERN void png_save_uint_32 PNGARG((png_bytep buf, png_uint_32 i));
-#if defined(PNG_WRITE_pCAL_SUPPORTED)
+#if defined(PNG_WRITE_pCAL_SUPPORTED) || defined(PNG_WRITE_oFFs_SUPPORTED)
PNG_EXTERN void png_save_int_32 PNGARG((png_bytep buf, png_int_32 i));
#endif
-/* Place a 16 bit number into a buffer in PNG byte order.
+/* Place a 16-bit number into a buffer in PNG byte order.
* The parameter is declared unsigned int, not png_uint_16,
* just to avoid potential problems on pre-ANSI C compilers.
*/
*/
PNG_EXTERN void png_write_IHDR PNGARG((png_structp png_ptr, png_uint_32 width,
png_uint_32 height,
- int bit_depth, int color_type, int compression_type, int filter_type,
- int interlace_type));
+ int bit_depth, int color_type, int compression_method, int filter_method,
+ int interlace_method));
PNG_EXTERN void png_write_PLTE PNGARG((png_structp png_ptr, png_colorp palette,
png_uint_32 num_pal));
PNG_EXTERN void png_write_IEND PNGARG((png_structp png_ptr));
#if defined(PNG_WRITE_gAMA_SUPPORTED)
+#ifdef PNG_FLOATING_POINT_SUPPORTED
PNG_EXTERN void png_write_gAMA PNGARG((png_structp png_ptr, double file_gamma));
#endif
+#ifdef PNG_FIXED_POINT_SUPPORTED
+PNG_EXTERN void png_write_gAMA_fixed PNGARG((png_structp png_ptr, png_fixed_point
+ file_gamma));
+#endif
+#endif
#if defined(PNG_WRITE_sBIT_SUPPORTED)
PNG_EXTERN void png_write_sBIT PNGARG((png_structp png_ptr, png_color_8p sbit,
#endif
#if defined(PNG_WRITE_cHRM_SUPPORTED)
+#ifdef PNG_FLOATING_POINT_SUPPORTED
PNG_EXTERN void png_write_cHRM PNGARG((png_structp png_ptr,
double white_x, double white_y,
double red_x, double red_y, double green_x, double green_y,
double blue_x, double blue_y));
#endif
+#ifdef PNG_FIXED_POINT_SUPPORTED
+PNG_EXTERN void png_write_cHRM_fixed PNGARG((png_structp png_ptr,
+ png_fixed_point int_white_x, png_fixed_point int_white_y,
+ png_fixed_point int_red_x, png_fixed_point int_red_y, png_fixed_point
+ int_green_x, png_fixed_point int_green_y, png_fixed_point int_blue_x,
+ png_fixed_point int_blue_y));
+#endif
+#endif
#if defined(PNG_WRITE_sRGB_SUPPORTED)
PNG_EXTERN void png_write_sRGB PNGARG((png_structp png_ptr,
int intent));
#endif
+#if defined(PNG_WRITE_iCCP_SUPPORTED)
+PNG_EXTERN void png_write_iCCP PNGARG((png_structp png_ptr,
+ png_charp name, int compression_type,
+ png_charp profile, int proflen));
+ /* Note to maintainer: profile should be png_bytep */
+#endif
+
+#if defined(PNG_WRITE_sPLT_SUPPORTED)
+PNG_EXTERN void png_write_sPLT PNGARG((png_structp png_ptr,
+ png_sPLT_tp palette));
+#endif
+
#if defined(PNG_WRITE_tRNS_SUPPORTED)
PNG_EXTERN void png_write_tRNS PNGARG((png_structp png_ptr, png_bytep trans,
png_color_16p values, int number, int color_type));
int num_hist));
#endif
-#if defined(PNG_WRITE_tEXt_SUPPORTED) || defined(PNG_WRITE_zTXt_SUPPORTED) || \
- defined(PNG_WRITE_pCAL_SUPPORTED)
+#if defined(PNG_WRITE_TEXT_SUPPORTED) || defined(PNG_WRITE_pCAL_SUPPORTED) || \
+ defined(PNG_WRITE_iCCP_SUPPORTED) || defined(PNG_WRITE_sPLT_SUPPORTED)
PNG_EXTERN png_size_t png_check_keyword PNGARG((png_structp png_ptr,
png_charp key, png_charpp new_key));
#endif
png_charp text, png_size_t text_len, int compression));
#endif
+#if defined(PNG_WRITE_iTXt_SUPPORTED)
+PNG_EXTERN void png_write_iTXt PNGARG((png_structp png_ptr,
+ int compression, png_charp key, png_charp lang, png_charp lang_key,
+ png_charp text));
+#endif
+
+#if defined(PNG_TEXT_SUPPORTED) /* Added at version 1.0.14 and 1.2.4 */
+PNG_EXTERN int png_set_text_2 PNGARG((png_structp png_ptr,
+ png_infop info_ptr, png_textp text_ptr, int num_text));
+#endif
+
#if defined(PNG_WRITE_oFFs_SUPPORTED)
PNG_EXTERN void png_write_oFFs PNGARG((png_structp png_ptr,
- png_uint_32 x_offset, png_uint_32 y_offset, int unit_type));
+ png_int_32 x_offset, png_int_32 y_offset, int unit_type));
#endif
#if defined(PNG_WRITE_pCAL_SUPPORTED)
png_timep mod_time));
#endif
+#if defined(PNG_WRITE_sCAL_SUPPORTED)
+#if defined(PNG_FLOATING_POINT_SUPPORTED) && !defined(PNG_NO_STDIO)
+PNG_EXTERN void png_write_sCAL PNGARG((png_structp png_ptr,
+ int unit, double width, double height));
+#else
+#ifdef PNG_FIXED_POINT_SUPPORTED
+PNG_EXTERN void png_write_sCAL_s PNGARG((png_structp png_ptr,
+ int unit, png_charp width, png_charp height));
+#endif
+#endif
+#endif
+
/* Called when finished processing a row of data */
PNG_EXTERN void png_write_finish_row PNGARG((png_structp png_ptr));
#if defined(PNG_READ_INTERLACING_SUPPORTED)
/* expand an interlaced row */
+/* OLD pre-1.0.9 interface:
PNG_EXTERN void png_do_read_interlace PNGARG((png_row_infop row_info,
png_bytep row, int pass, png_uint_32 transformations));
+ */
+PNG_EXTERN void png_do_read_interlace PNGARG((png_structp png_ptr));
#endif
+/* GRR TO DO (2.0 or whenever): simplify other internal calling interfaces */
+
#if defined(PNG_WRITE_INTERLACING_SUPPORTED)
/* grab pixels out of a row for an interlaced pass */
PNG_EXTERN void png_do_write_interlace PNGARG((png_row_infop row_info,
#endif
#if defined(PNG_READ_BACKGROUND_SUPPORTED)
+#if defined(PNG_READ_GAMMA_SUPPORTED)
PNG_EXTERN void png_do_background PNGARG((png_row_infop row_info, png_bytep row,
png_color_16p trans_values, png_color_16p background,
png_color_16p background_1,
png_bytep gamma_table, png_bytep gamma_from_1, png_bytep gamma_to_1,
png_uint_16pp gamma_16, png_uint_16pp gamma_16_from_1,
png_uint_16pp gamma_16_to_1, int gamma_shift));
+#else
+PNG_EXTERN void png_do_background PNGARG((png_row_infop row_info, png_bytep row,
+ png_color_16p trans_values, png_color_16p background));
+#endif
#endif
#if defined(PNG_READ_GAMMA_SUPPORTED)
PNG_EXTERN void png_handle_IEND PNGARG((png_structp png_ptr, png_infop info_ptr,
png_uint_32 length));
-#if defined(PNG_READ_gAMA_SUPPORTED)
-PNG_EXTERN void png_handle_gAMA PNGARG((png_structp png_ptr, png_infop info_ptr,
- png_uint_32 length));
-#endif
-
-#if defined(PNG_READ_sBIT_SUPPORTED)
-PNG_EXTERN void png_handle_sBIT PNGARG((png_structp png_ptr, png_infop info_ptr,
+#if defined(PNG_READ_bKGD_SUPPORTED)
+PNG_EXTERN void png_handle_bKGD PNGARG((png_structp png_ptr, png_infop info_ptr,
png_uint_32 length));
#endif
png_uint_32 length));
#endif
-#if defined(PNG_READ_sRGB_SUPPORTED)
-PNG_EXTERN void png_handle_sRGB PNGARG((png_structp png_ptr, png_infop info_ptr,
+#if defined(PNG_READ_gAMA_SUPPORTED)
+PNG_EXTERN void png_handle_gAMA PNGARG((png_structp png_ptr, png_infop info_ptr,
png_uint_32 length));
#endif
-#if defined(PNG_READ_tRNS_SUPPORTED)
-PNG_EXTERN void png_handle_tRNS PNGARG((png_structp png_ptr, png_infop info_ptr,
+#if defined(PNG_READ_hIST_SUPPORTED)
+PNG_EXTERN void png_handle_hIST PNGARG((png_structp png_ptr, png_infop info_ptr,
png_uint_32 length));
#endif
-#if defined(PNG_READ_bKGD_SUPPORTED)
-PNG_EXTERN void png_handle_bKGD PNGARG((png_structp png_ptr, png_infop info_ptr,
+#if defined(PNG_READ_iCCP_SUPPORTED)
+extern void png_handle_iCCP PNGARG((png_structp png_ptr, png_infop info_ptr,
png_uint_32 length));
-#endif
+#endif /* PNG_READ_iCCP_SUPPORTED */
-#if defined(PNG_READ_hIST_SUPPORTED)
-PNG_EXTERN void png_handle_hIST PNGARG((png_structp png_ptr, png_infop info_ptr,
+#if defined(PNG_READ_iTXt_SUPPORTED)
+PNG_EXTERN void png_handle_iTXt PNGARG((png_structp png_ptr, png_infop info_ptr,
png_uint_32 length));
#endif
png_uint_32 length));
#endif
-#if defined(PNG_READ_tIME_SUPPORTED)
-PNG_EXTERN void png_handle_tIME PNGARG((png_structp png_ptr, png_infop info_ptr,
+#if defined(PNG_READ_sBIT_SUPPORTED)
+PNG_EXTERN void png_handle_sBIT PNGARG((png_structp png_ptr, png_infop info_ptr,
+ png_uint_32 length));
+#endif
+
+#if defined(PNG_READ_sCAL_SUPPORTED)
+PNG_EXTERN void png_handle_sCAL PNGARG((png_structp png_ptr, png_infop info_ptr,
+ png_uint_32 length));
+#endif
+
+#if defined(PNG_READ_sPLT_SUPPORTED)
+extern void png_handle_sPLT PNGARG((png_structp png_ptr, png_infop info_ptr,
+ png_uint_32 length));
+#endif /* PNG_READ_sPLT_SUPPORTED */
+
+#if defined(PNG_READ_sRGB_SUPPORTED)
+PNG_EXTERN void png_handle_sRGB PNGARG((png_structp png_ptr, png_infop info_ptr,
png_uint_32 length));
#endif
png_uint_32 length));
#endif
+#if defined(PNG_READ_tIME_SUPPORTED)
+PNG_EXTERN void png_handle_tIME PNGARG((png_structp png_ptr, png_infop info_ptr,
+ png_uint_32 length));
+#endif
+
+#if defined(PNG_READ_tRNS_SUPPORTED)
+PNG_EXTERN void png_handle_tRNS PNGARG((png_structp png_ptr, png_infop info_ptr,
+ png_uint_32 length));
+#endif
+
#if defined(PNG_READ_zTXt_SUPPORTED)
PNG_EXTERN void png_handle_zTXt PNGARG((png_structp png_ptr, png_infop info_ptr,
png_uint_32 length));
PNG_EXTERN void png_push_crc_skip PNGARG((png_structp png_ptr,
png_uint_32 length));
PNG_EXTERN void png_push_crc_finish PNGARG((png_structp png_ptr));
-PNG_EXTERN void png_push_fill_buffer PNGARG((png_structp png_ptr,
- png_bytep buffer, png_size_t length));
PNG_EXTERN void png_push_save_buffer PNGARG((png_structp png_ptr));
PNG_EXTERN void png_push_restore_buffer PNGARG((png_structp png_ptr,
png_bytep buffer, png_size_t buffer_length));
PNG_EXTERN void png_push_read_zTXt PNGARG((png_structp png_ptr,
png_infop info_ptr));
#endif
+#if defined(PNG_READ_iTXt_SUPPORTED)
+PNG_EXTERN void png_push_handle_iTXt PNGARG((png_structp png_ptr,
+ png_infop info_ptr, png_uint_32 length));
+PNG_EXTERN void png_push_read_iTXt PNGARG((png_structp png_ptr,
+ png_infop info_ptr));
+#endif
#endif /* PNG_PROGRESSIVE_READ_SUPPORTED */
+#ifdef PNG_MNG_FEATURES_SUPPORTED
+PNG_EXTERN void png_do_read_intrapixel PNGARG((png_row_infop row_info,
+ png_bytep row));
+PNG_EXTERN void png_do_write_intrapixel PNGARG((png_row_infop row_info,
+ png_bytep row));
+#endif
+
+#if defined(PNG_ASSEMBLER_CODE_SUPPORTED)
+/* png.c */ /* PRIVATE */
+PNG_EXTERN void png_init_mmx_flags PNGARG((png_structp png_ptr));
+#endif
+/* Maintainer: Put new private prototypes here ^ and in libpngpf.3 */
+
#endif /* PNG_INTERNAL */
#ifdef __cplusplus
}
#endif
+#endif /* PNG_VERSION_INFO_ONLY */
/* do not put anything past this line */
-#endif /* _PNG_H */
+#endif /* PNG_H */
-
/* pngconf.h - machine configurable file for libpng
*
- * libpng 1.0.3 - January 14, 1999
+ * libpng 1.2.4 - July 8, 2002
* For conditions of distribution and use, see copyright notice in png.h
- * Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.
- * Copyright (c) 1996, 1997 Andreas Dilger
- * Copyright (c) 1998, 1999 Glenn Randers-Pehrson
+ * Copyright (c) 1998-2002 Glenn Randers-Pehrson
+ * (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger)
+ * (Version 0.88 Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.)
*/
/* Any machine specific code is near the front of this file, so if you
#ifndef PNGCONF_H
#define PNGCONF_H
-
/* This is the size of the compression buffer, and thus the size of
* an IDAT chunk. Make this whatever size you feel is best for your
* machine. One of these will be allocated per png_struct. When this
*/
#ifndef PNG_ZBUF_SIZE
-#define PNG_ZBUF_SIZE 8192
+# define PNG_ZBUF_SIZE 8192
+#endif
+
+/* Enable if you want a write-only libpng */
+
+#ifndef PNG_NO_READ_SUPPORTED
+# define PNG_READ_SUPPORTED
+#endif
+
+/* Enable if you want a read-only libpng */
+
+#ifndef PNG_NO_WRITE_SUPPORTED
+# define PNG_WRITE_SUPPORTED
+#endif
+
+/* Enabled by default in 1.2.0. You can disable this if you don't need to
+ support PNGs that are embedded in MNG datastreams */
+#if !defined(PNG_1_0_X) && !defined(PNG_NO_MNG_FEATURES)
+# ifndef PNG_MNG_FEATURES_SUPPORTED
+# define PNG_MNG_FEATURES_SUPPORTED
+# endif
+#endif
+
+#ifndef PNG_NO_FLOATING_POINT_SUPPORTED
+# ifndef PNG_FLOATING_POINT_SUPPORTED
+# define PNG_FLOATING_POINT_SUPPORTED
+# endif
#endif
/* If you are running on a machine where you cannot allocate more
#define PNG_MAX_MALLOC_64K
*/
#if defined(MAXSEG_64K) && !defined(PNG_MAX_MALLOC_64K)
-#define PNG_MAX_MALLOC_64K
+# define PNG_MAX_MALLOC_64K
+#endif
+
+/* Special munging to support doing things the 'cygwin' way:
+ * 'Normal' png-on-win32 defines/defaults:
+ * PNG_BUILD_DLL -- building dll
+ * PNG_USE_DLL -- building an application, linking to dll
+ * (no define) -- building static library, or building an
+ * application and linking to the static lib
+ * 'Cygwin' defines/defaults:
+ * PNG_BUILD_DLL -- (ignored) building the dll
+ * (no define) -- (ignored) building an application, linking to the dll
+ * PNG_STATIC -- (ignored) building the static lib, or building an
+ * application that links to the static lib.
+ * ALL_STATIC -- (ignored) building various static libs, or building an
+ * application that links to the static libs.
+ * Thus,
+ * a cygwin user should define either PNG_BUILD_DLL or PNG_STATIC, and
+ * this bit of #ifdefs will define the 'correct' config variables based on
+ * that. If a cygwin user *wants* to define 'PNG_USE_DLL' that's okay, but
+ * unnecessary.
+ *
+ * Also, the precedence order is:
+ * ALL_STATIC (since we can't #undef something outside our namespace)
+ * PNG_BUILD_DLL
+ * PNG_STATIC
+ * (nothing) == PNG_USE_DLL
+ *
+ * CYGWIN (2002-01-20): The preceding is now obsolete. With the advent
+ * of auto-import in binutils, we no longer need to worry about
+ * __declspec(dllexport) / __declspec(dllimport) and friends. Therefore,
+ * we don't need to worry about PNG_STATIC or ALL_STATIC when it comes
+ * to __declspec() stuff. However, we DO need to worry about
+ * PNG_BUILD_DLL and PNG_STATIC because those change some defaults
+ * such as CONSOLE_IO and whether GLOBAL_ARRAYS are allowed.
+ */
+#if defined(__CYGWIN__)
+# if defined(ALL_STATIC)
+# if defined(PNG_BUILD_DLL)
+# undef PNG_BUILD_DLL
+# endif
+# if defined(PNG_USE_DLL)
+# undef PNG_USE_DLL
+# endif
+# if defined(PNG_DLL)
+# undef PNG_DLL
+# endif
+# if !defined(PNG_STATIC)
+# define PNG_STATIC
+# endif
+# else
+# if defined (PNG_BUILD_DLL)
+# if defined(PNG_STATIC)
+# undef PNG_STATIC
+# endif
+# if defined(PNG_USE_DLL)
+# undef PNG_USE_DLL
+# endif
+# if !defined(PNG_DLL)
+# define PNG_DLL
+# endif
+# else
+# if defined(PNG_STATIC)
+# if defined(PNG_USE_DLL)
+# undef PNG_USE_DLL
+# endif
+# if defined(PNG_DLL)
+# undef PNG_DLL
+# endif
+# else
+# if !defined(PNG_USE_DLL)
+# define PNG_USE_DLL
+# endif
+# if !defined(PNG_DLL)
+# define PNG_DLL
+# endif
+# endif
+# endif
+# endif
#endif
/* This protects us against compilers that run on a windowing system
* prevent these from being compiled and used. #defining PNG_NO_STDIO
* will also prevent these, plus will prevent the entire set of stdio
* macros and functions (FILE *, printf, etc.) from being compiled and used,
- * unless PNG_DEBUG has been #defined.
+ * unless (PNG_DEBUG > 0) has been #defined.
*
* #define PNG_NO_CONSOLE_IO
* #define PNG_NO_STDIO
*/
-#ifdef PNG_DEBUG
-# if (PNG_DEBUG > 0)
-# include <stdio.h>
+#if defined(_WIN32_WCE)
+# include <windows.h>
+ /* Console I/O functions are not supported on WindowsCE */
+# define PNG_NO_CONSOLE_IO
+# ifdef PNG_DEBUG
+# undef PNG_DEBUG
# endif
-#else
+#endif
+
+#ifdef PNG_BUILD_DLL
+# ifndef PNG_CONSOLE_IO_SUPPORTED
+# ifndef PNG_NO_CONSOLE_IO
+# define PNG_NO_CONSOLE_IO
+# endif
+# endif
+#endif
+
# ifdef PNG_NO_STDIO
# ifndef PNG_NO_CONSOLE_IO
# define PNG_NO_CONSOLE_IO
# endif
+# ifdef PNG_DEBUG
+# if (PNG_DEBUG > 0)
+# include <stdio.h>
+# endif
+# endif
# else
-# include <stdio.h>
+# if !defined(_WIN32_WCE)
+/* "stdio.h" functions are not supported on WindowsCE */
+# include <stdio.h>
+# endif
# endif
-#endif
/* This macro protects us against machines that don't have function
* prototypes (ie K&R style headers). If your compiler does not handle
#ifndef PNGARG
#ifdef OF /* zlib prototype munger */
-#define PNGARG(arglist) OF(arglist)
+# define PNGARG(arglist) OF(arglist)
#else
#ifdef _NO_PROTO
-#define PNGARG(arglist) ()
+# define PNGARG(arglist) ()
+# ifndef PNG_TYPECAST_NULL
+# define PNG_TYPECAST_NULL
+# endif
#else
-#define PNGARG(arglist) arglist
+# define PNGARG(arglist) arglist
#endif /* _NO_PROTO */
#endif /* OF */
* on non-Mac platforms.
*/
#ifndef MACOS
-#if (defined(__MWERKS__) && defined(macintosh)) || defined(applec) || \
- defined(THINK_C) || defined(__SC__) || defined(TARGET_OS_MAC)
-#define MACOS
-#endif
+# if (defined(__MWERKS__) && defined(macintosh)) || defined(applec) || \
+ defined(THINK_C) || defined(__SC__) || defined(TARGET_OS_MAC)
+# define MACOS
+# endif
#endif
/* enough people need this for various reasons to include it here */
-#if !defined(MACOS) && !defined(RISCOS)
-#include <sys/types.h>
+#if !defined(MACOS) && !defined(RISCOS) && !defined(_WIN32_WCE)
+# include <sys/types.h>
+#endif
+
+#if !defined(PNG_SETJMP_NOT_SUPPORTED) && !defined(PNG_NO_SETJMP_SUPPORTED)
+# define PNG_SETJMP_SUPPORTED
#endif
+#ifdef PNG_SETJMP_SUPPORTED
/* This is an attempt to force a single setjmp behaviour on Linux. If
* the X config stuff didn't define _BSD_SOURCE we wouldn't need this.
*/
-#ifdef __linux__
-#ifdef _BSD_SOURCE
-#define _PNG_SAVE_BSD_SOURCE
-#undef _BSD_SOURCE
-#endif
-#ifdef _SETJMP_H
-__png.h__ already includes setjmp.h
-__dont__ include it again
-#endif
-#endif /* __linux__ */
-/* include setjmp.h for error handling */
-#include <setjmp.h>
+# ifdef __linux__
+# ifdef _BSD_SOURCE
+# define PNG_SAVE_BSD_SOURCE
+# undef _BSD_SOURCE
+# endif
+# ifdef _SETJMP_H
+ __png.h__ already includes setjmp.h;
+ __dont__ include it again.;
+# endif
+# endif /* __linux__ */
+
+ /* include setjmp.h for error handling */
+# include <setjmp.h>
-#ifdef __linux__
-#ifdef _PNG_SAVE_BSD_SOURCE
-#define _BSD_SOURCE
-#undef _PNG_SAVE_BSD_SOURCE
-#endif
-#endif /* __linux__ */
+# ifdef __linux__
+# ifdef PNG_SAVE_BSD_SOURCE
+# define _BSD_SOURCE
+# undef PNG_SAVE_BSD_SOURCE
+# endif
+# endif /* __linux__ */
+#endif /* PNG_SETJMP_SUPPORTED */
#ifdef BSD
-#include <strings.h>
+# include <strings.h>
#else
-#include <string.h>
+# include <string.h>
#endif
/* Other defines for things like memory and the like can go here. */
#ifdef PNG_INTERNAL
+
#include <stdlib.h>
/* The functions exported by PNG_EXTERN are PNG_INTERNAL functions, which
* them inside an appropriate ifdef/endif pair for portability.
*/
-#if defined(MACOS)
-/* We need to check that <math.h> hasn't already been included earlier
- * as it seems it doesn't agree with <fp.h>, yet we should really use
- * <fp.h> if possible.
- */
-#if !defined(__MATH_H__) && !defined(__MATH_H) && !defined(__cmath__)
-#include <fp.h>
-#endif
-#else
-#include <math.h>
+#if defined(PNG_FLOATING_POINT_SUPPORTED)
+# if defined(MACOS)
+ /* We need to check that <math.h> hasn't already been included earlier
+ * as it seems it doesn't agree with <fp.h>, yet we should really use
+ * <fp.h> if possible.
+ */
+# if !defined(__MATH_H__) && !defined(__MATH_H) && !defined(__cmath__)
+# include <fp.h>
+# endif
+# else
+# include <math.h>
+# endif
+# if defined(_AMIGA) && defined(__SASC) && defined(_M68881)
+ /* Amiga SAS/C: We must include builtin FPU functions when compiling using
+ * MATH=68881
+ */
+# include <m68881.h>
+# endif
#endif
/* Codewarrior on NT has linking problems without this. */
-#if defined(__MWERKS__) && defined(WIN32)
-#define PNG_ALWAYS_EXTERN
+#if (defined(__MWERKS__) && defined(WIN32)) || defined(__STDC__)
+# define PNG_ALWAYS_EXTERN
#endif
/* For some reason, Borland C++ defines memcmp, etc. in mem.h, not
* "feature"?
*/
#ifdef __TURBOC__
-#include <mem.h>
-#include "alloc.h"
+# include <mem.h>
+# include "alloc.h"
#endif
-#ifdef _MSC_VER
-#include <malloc.h>
+#if defined(_MSC_VER) && (defined(WIN32) || defined(_Windows) || \
+ defined(_WINDOWS) || defined(_WIN32) || defined(__WIN32__))
+# include <malloc.h>
#endif
/* This controls how fine the dithering gets. As this allocates
* with dithering quality can decrease some or all of these.
*/
#ifndef PNG_DITHER_RED_BITS
-#define PNG_DITHER_RED_BITS 5
+# define PNG_DITHER_RED_BITS 5
#endif
#ifndef PNG_DITHER_GREEN_BITS
-#define PNG_DITHER_GREEN_BITS 5
+# define PNG_DITHER_GREEN_BITS 5
#endif
#ifndef PNG_DITHER_BLUE_BITS
-#define PNG_DITHER_BLUE_BITS 5
+# define PNG_DITHER_BLUE_BITS 5
#endif
/* This controls how fine the gamma correction becomes when you
*/
#ifndef PNG_MAX_GAMMA_8
-#define PNG_MAX_GAMMA_8 11
+# define PNG_MAX_GAMMA_8 11
#endif
/* This controls how much a difference in gamma we can tolerate before
* we actually start doing gamma conversion.
*/
#ifndef PNG_GAMMA_THRESHOLD
-#define PNG_GAMMA_THRESHOLD 0.05
+# define PNG_GAMMA_THRESHOLD 0.05
#endif
#endif /* PNG_INTERNAL */
* things to happen if the library and/or application ever change.
*/
-/* Any transformations you will not be using can be undef'ed here */
+/* Any features you will not be using can be undef'ed here */
/* GR-P, 0.96a: Set "*TRANSFORMS_SUPPORTED as default but allow user
- to turn it off with "*TRANSFORMS_NOT_SUPPORTED" or *PNG_NO_*_TRANSFORMS
- on the compile line, then pick and choose which ones to define without
- having to edit this file. It is safe to use the *TRANSFORMS_NOT_SUPPORTED
- if you only want to have a png-compliant reader/writer but don't need
- any of the extra transformations. This saves about 80 kbytes in a
- typical installation of the library. (PNG_NO_* form added in version
- 1.0.1c, for consistency)
+ * to turn it off with "*TRANSFORMS_NOT_SUPPORTED" or *PNG_NO_*_TRANSFORMS
+ * on the compile line, then pick and choose which ones to define without
+ * having to edit this file. It is safe to use the *TRANSFORMS_NOT_SUPPORTED
+ * if you only want to have a png-compliant reader/writer but don't need
+ * any of the extra transformations. This saves about 80 kbytes in a
+ * typical installation of the library. (PNG_NO_* form added in version
+ * 1.0.1c, for consistency)
*/
+/* The size of the png_text structure changed in libpng-1.0.6 when
+ * iTXt is supported. It is turned off by default, to support old apps
+ * that malloc the png_text structure instead of calling png_set_text()
+ * and letting libpng malloc it. It will be turned on by default in
+ * libpng-1.3.0.
+ */
-#if !defined(PNG_READ_TRANSFORMS_NOT_SUPPORTED) && \
- !defined(PNG_NO_READ_TRANSFORMS)
-#define PNG_READ_TRANSFORMS_SUPPORTED
+#ifndef PNG_iTXt_SUPPORTED
+# if !defined(PNG_READ_iTXt_SUPPORTED) && !defined(PNG_NO_READ_iTXt)
+# define PNG_NO_READ_iTXt
+# endif
+# if !defined(PNG_WRITE_iTXt_SUPPORTED) && !defined(PNG_NO_WRITE_iTXt)
+# define PNG_NO_WRITE_iTXt
+# endif
#endif
-#if !defined(PNG_WRITE_TRANSFORMS_NOT_SUPPORTED) && \
- !defined(PNG_NO_WRITE_TRANSFORMS)
-#define PNG_WRITE_TRANSFORMS_SUPPORTED
+
+/* The following support, added after version 1.0.0, can be turned off here en
+ * masse by defining PNG_LEGACY_SUPPORTED in case you need binary compatibility
+ * with old applications that require the length of png_struct and png_info
+ * to remain unchanged.
+ */
+
+#ifdef PNG_LEGACY_SUPPORTED
+# define PNG_NO_FREE_ME
+# define PNG_NO_READ_UNKNOWN_CHUNKS
+# define PNG_NO_WRITE_UNKNOWN_CHUNKS
+# define PNG_NO_READ_USER_CHUNKS
+# define PNG_NO_READ_iCCP
+# define PNG_NO_WRITE_iCCP
+# define PNG_NO_READ_iTXt
+# define PNG_NO_WRITE_iTXt
+# define PNG_NO_READ_sCAL
+# define PNG_NO_WRITE_sCAL
+# define PNG_NO_READ_sPLT
+# define PNG_NO_WRITE_sPLT
+# define PNG_NO_INFO_IMAGE
+# define PNG_NO_READ_RGB_TO_GRAY
+# define PNG_NO_READ_USER_TRANSFORM
+# define PNG_NO_WRITE_USER_TRANSFORM
+# define PNG_NO_USER_MEM
+# define PNG_NO_READ_EMPTY_PLTE
+# define PNG_NO_MNG_FEATURES
+# define PNG_NO_FIXED_POINT_SUPPORTED
+#endif
+
+/* Ignore attempt to turn off both floating and fixed point support */
+#if !defined(PNG_FLOATING_POINT_SUPPORTED) || \
+ !defined(PNG_NO_FIXED_POINT_SUPPORTED)
+# define PNG_FIXED_POINT_SUPPORTED
+#endif
+
+#ifndef PNG_NO_FREE_ME
+# define PNG_FREE_ME_SUPPORTED
+#endif
+
+#if defined(PNG_READ_SUPPORTED)
+
+#if !defined(PNG_READ_TRANSFORMS_NOT_SUPPORTED) && \
+ !defined(PNG_NO_READ_TRANSFORMS)
+# define PNG_READ_TRANSFORMS_SUPPORTED
#endif
#ifdef PNG_READ_TRANSFORMS_SUPPORTED
-#ifndef PNG_NO_READ_EXPAND
-#define PNG_READ_EXPAND_SUPPORTED
-#endif
-#ifndef PNG_NO_READ_SHIFT
-#define PNG_READ_SHIFT_SUPPORTED
-#endif
-#ifndef PNG_NO_READ_PACK
-#define PNG_READ_PACK_SUPPORTED
-#endif
-#ifndef PNG_NO_READ_BGR
-#define PNG_READ_BGR_SUPPORTED
-#endif
-#ifndef PNG_NO_READ_SWAP
-#define PNG_READ_SWAP_SUPPORTED
-#endif
-#ifndef PNG_NO_READ_PACKSWAP
-#define PNG_READ_PACKSWAP_SUPPORTED
-#endif
-#ifndef PNG_NO_READ_INVERT
-#define PNG_READ_INVERT_SUPPORTED
-#endif
-#ifndef PNG_NO_READ_DITHER
-#define PNG_READ_DITHER_SUPPORTED
-#endif
-#ifndef PNG_NO_READ_BACKGROUND
-#define PNG_READ_BACKGROUND_SUPPORTED
-#endif
-#ifndef PNG_NO_READ_16_TO_8
-#define PNG_READ_16_TO_8_SUPPORTED
-#endif
-#ifndef PNG_NO_READ_FILLER
-#define PNG_READ_FILLER_SUPPORTED
-#endif
-#ifndef PNG_NO_READ_GAMMA
-#define PNG_READ_GAMMA_SUPPORTED
-#endif
-#ifndef PNG_NO_READ_GRAY_TO_RGB
-#define PNG_READ_GRAY_TO_RGB_SUPPORTED
-#endif
-#ifndef PNG_NO_READ_SWAP_ALPHA
-#define PNG_READ_SWAP_ALPHA_SUPPORTED
-#endif
-#ifndef PNG_NO_READ_INVERT_ALPHA
-#define PNG_READ_INVERT_ALPHA_SUPPORTED
-#endif
-#ifndef PNG_NO_READ_STRIP_ALPHA
-#define PNG_READ_STRIP_ALPHA_SUPPORTED
-#endif
-#ifndef PNG_NO_READ_USER_TRANSFORM
-#define PNG_READ_USER_TRANSFORM_SUPPORTED
-#endif
-#ifndef PNG_NO_READ_RGB_TO_GRAY
-#define PNG_READ_RGB_TO_GRAY_SUPPORTED
-#endif
+# ifndef PNG_NO_READ_EXPAND
+# define PNG_READ_EXPAND_SUPPORTED
+# endif
+# ifndef PNG_NO_READ_SHIFT
+# define PNG_READ_SHIFT_SUPPORTED
+# endif
+# ifndef PNG_NO_READ_PACK
+# define PNG_READ_PACK_SUPPORTED
+# endif
+# ifndef PNG_NO_READ_BGR
+# define PNG_READ_BGR_SUPPORTED
+# endif
+# ifndef PNG_NO_READ_SWAP
+# define PNG_READ_SWAP_SUPPORTED
+# endif
+# ifndef PNG_NO_READ_PACKSWAP
+# define PNG_READ_PACKSWAP_SUPPORTED
+# endif
+# ifndef PNG_NO_READ_INVERT
+# define PNG_READ_INVERT_SUPPORTED
+# endif
+# ifndef PNG_NO_READ_DITHER
+# define PNG_READ_DITHER_SUPPORTED
+# endif
+# ifndef PNG_NO_READ_BACKGROUND
+# define PNG_READ_BACKGROUND_SUPPORTED
+# endif
+# ifndef PNG_NO_READ_16_TO_8
+# define PNG_READ_16_TO_8_SUPPORTED
+# endif
+# ifndef PNG_NO_READ_FILLER
+# define PNG_READ_FILLER_SUPPORTED
+# endif
+# ifndef PNG_NO_READ_GAMMA
+# define PNG_READ_GAMMA_SUPPORTED
+# endif
+# ifndef PNG_NO_READ_GRAY_TO_RGB
+# define PNG_READ_GRAY_TO_RGB_SUPPORTED
+# endif
+# ifndef PNG_NO_READ_SWAP_ALPHA
+# define PNG_READ_SWAP_ALPHA_SUPPORTED
+# endif
+# ifndef PNG_NO_READ_INVERT_ALPHA
+# define PNG_READ_INVERT_ALPHA_SUPPORTED
+# endif
+# ifndef PNG_NO_READ_STRIP_ALPHA
+# define PNG_READ_STRIP_ALPHA_SUPPORTED
+# endif
+# ifndef PNG_NO_READ_USER_TRANSFORM
+# define PNG_READ_USER_TRANSFORM_SUPPORTED
+# endif
+# ifndef PNG_NO_READ_RGB_TO_GRAY
+# define PNG_READ_RGB_TO_GRAY_SUPPORTED
+# endif
#endif /* PNG_READ_TRANSFORMS_SUPPORTED */
#if !defined(PNG_NO_PROGRESSIVE_READ) && \
- !defined(PNG_PROGRESSIVE_READ_NOT_SUPPORTED) /* if you don't do progressive */
-#define PNG_PROGRESSIVE_READ_SUPPORTED /* reading. This is not talking */
+ !defined(PNG_PROGRESSIVE_READ_NOT_SUPPORTED) /* if you don't do progressive */
+# define PNG_PROGRESSIVE_READ_SUPPORTED /* reading. This is not talking */
#endif /* about interlacing capability! You'll */
/* still have interlacing unless you change the following line: */
+
#define PNG_READ_INTERLACING_SUPPORTED /* required for PNG-compliant decoders */
-#ifndef PNG_NO_READ_COMPOSITED_NODIV
-#define PNG_READ_COMPOSITE_NODIV_SUPPORTED /* well tested on Intel and SGI */
+#ifndef PNG_NO_READ_COMPOSITE_NODIV
+# ifndef PNG_NO_READ_COMPOSITED_NODIV /* libpng-1.0.x misspelling */
+# define PNG_READ_COMPOSITE_NODIV_SUPPORTED /* well tested on Intel, SGI */
+# endif
#endif
-#ifdef PNG_WRITE_TRANSFORMS_SUPPORTED
-#ifndef PNG_NO_WRITE_SHIFT
-#define PNG_WRITE_SHIFT_SUPPORTED
-#endif
-#ifndef PNG_NO_WRITE_PACK
-#define PNG_WRITE_PACK_SUPPORTED
+/* Deprecated, will be removed from version 2.0.0.
+ Use PNG_MNG_FEATURES_SUPPORTED instead. */
+#ifndef PNG_NO_READ_EMPTY_PLTE
+# define PNG_READ_EMPTY_PLTE_SUPPORTED
#endif
-#ifndef PNG_NO_WRITE_BGR
-#define PNG_WRITE_BGR_SUPPORTED
-#endif
-#ifndef PNG_NO_WRITE_SWAP
-#define PNG_WRITE_SWAP_SUPPORTED
-#endif
-#ifndef PNG_NO_WRITE_PACKSWAP
-#define PNG_WRITE_PACKSWAP_SUPPORTED
-#endif
-#ifndef PNG_NO_WRITE_INVERT
-#define PNG_WRITE_INVERT_SUPPORTED
-#endif
-#ifndef PNG_NO_WRITE_FILLER
-#define PNG_WRITE_FILLER_SUPPORTED /* This is the same as WRITE_STRIP_ALPHA */
-#endif
-#ifndef PNG_NO_WRITE_SWAP_ALPHA
-#define PNG_WRITE_SWAP_ALPHA_SUPPORTED
-#endif
-#ifndef PNG_NO_WRITE_INVERT_ALPHA
-#define PNG_WRITE_INVERT_ALPHA_SUPPORTED
-#endif
-#ifndef PNG_NO_WRITE_USER_TRANSFORM
-#define PNG_WRITE_USER_TRANSFORM_SUPPORTED
+
+#endif /* PNG_READ_SUPPORTED */
+
+#if defined(PNG_WRITE_SUPPORTED)
+
+# if !defined(PNG_WRITE_TRANSFORMS_NOT_SUPPORTED) && \
+ !defined(PNG_NO_WRITE_TRANSFORMS)
+# define PNG_WRITE_TRANSFORMS_SUPPORTED
#endif
+
+#ifdef PNG_WRITE_TRANSFORMS_SUPPORTED
+# ifndef PNG_NO_WRITE_SHIFT
+# define PNG_WRITE_SHIFT_SUPPORTED
+# endif
+# ifndef PNG_NO_WRITE_PACK
+# define PNG_WRITE_PACK_SUPPORTED
+# endif
+# ifndef PNG_NO_WRITE_BGR
+# define PNG_WRITE_BGR_SUPPORTED
+# endif
+# ifndef PNG_NO_WRITE_SWAP
+# define PNG_WRITE_SWAP_SUPPORTED
+# endif
+# ifndef PNG_NO_WRITE_PACKSWAP
+# define PNG_WRITE_PACKSWAP_SUPPORTED
+# endif
+# ifndef PNG_NO_WRITE_INVERT
+# define PNG_WRITE_INVERT_SUPPORTED
+# endif
+# ifndef PNG_NO_WRITE_FILLER
+# define PNG_WRITE_FILLER_SUPPORTED /* same as WRITE_STRIP_ALPHA */
+# endif
+# ifndef PNG_NO_WRITE_SWAP_ALPHA
+# define PNG_WRITE_SWAP_ALPHA_SUPPORTED
+# endif
+# ifndef PNG_NO_WRITE_INVERT_ALPHA
+# define PNG_WRITE_INVERT_ALPHA_SUPPORTED
+# endif
+# ifndef PNG_NO_WRITE_USER_TRANSFORM
+# define PNG_WRITE_USER_TRANSFORM_SUPPORTED
+# endif
#endif /* PNG_WRITE_TRANSFORMS_SUPPORTED */
+#if defined(PNG_READ_USER_TRANSFORM_SUPPORTED) || \
+ defined(PNG_WRITE_USER_TRANSFORM_SUPPORTED)
+# ifndef PNG_NO_USER_TRANSFORM_PTR
+# define PNG_USER_TRANSFORM_PTR_SUPPORTED
+# endif
+#endif
+
#define PNG_WRITE_INTERLACING_SUPPORTED /* not required for PNG-compliant
encoders, but can cause trouble
if left undefined */
-#ifndef PNG_NO_WRITE_WEIGHTED_FILTER
-#define PNG_WRITE_WEIGHTED_FILTER_SUPPORTED
+#if !defined(PNG_NO_WRITE_WEIGHTED_FILTER) && \
+ defined(PNG_FLOATING_POINT_SUPPORTED)
+# define PNG_WRITE_WEIGHTED_FILTER_SUPPORTED
#endif
+#ifndef PNG_1_0_X
+#ifndef PNG_NO_ERROR_NUMBERS
+#define PNG_ERROR_NUMBERS_SUPPORTED
+#endif
+#endif /* PNG_1_0_X */
+
#ifndef PNG_NO_WRITE_FLUSH
-#define PNG_WRITE_FLUSH_SUPPORTED
+# define PNG_WRITE_FLUSH_SUPPORTED
+#endif
+
+/* Deprecated, see PNG_MNG_FEATURES_SUPPORTED, above */
+#ifndef PNG_NO_WRITE_EMPTY_PLTE
+# define PNG_WRITE_EMPTY_PLTE_SUPPORTED
#endif
+#endif /* PNG_WRITE_SUPPORTED */
+
#ifndef PNG_NO_STDIO
-#define PNG_TIME_RFC1123_SUPPORTED
+# define PNG_TIME_RFC1123_SUPPORTED
#endif
/* This adds extra functions in pngget.c for accessing data from the
* png_get_x_offset_microns()
* png_get_y_offset_microns()
*/
-#ifndef PNG_NO_EASY_ACCESS
-#define PNG_EASY_ACCESS_SUPPORTED
+#if !defined(PNG_NO_EASY_ACCESS) && !defined(PNG_EASY_ACCESS_SUPPORTED)
+# define PNG_EASY_ACCESS_SUPPORTED
+#endif
+
+/* PNG_ASSEMBLER_CODE was enabled by default in version 1.2.0
+ even when PNG_USE_PNGVCRD or PNG_USE_PNGGCCRD is not defined */
+#if defined(PNG_READ_SUPPORTED) && !defined(PNG_NO_ASSEMBLER_CODE)
+# ifndef PNG_ASSEMBLER_CODE_SUPPORTED
+# define PNG_ASSEMBLER_CODE_SUPPORTED
+# endif
+# if !defined(PNG_MMX_CODE_SUPPORTED) && !defined(PNG_NO_MMX_CODE)
+# define PNG_MMX_CODE_SUPPORTED
+# endif
#endif
+/* If you are sure that you don't need thread safety and you are compiling
+ with PNG_USE_PNGCCRD for an MMX application, you can define this for
+ faster execution. See pnggccrd.c.
+#define PNG_THREAD_UNSAFE_OK
+*/
+
+#if !defined(PNG_1_0_X)
+#if !defined(PNG_NO_USER_MEM) && !defined(PNG_USER_MEM_SUPPORTED)
+# define PNG_USER_MEM_SUPPORTED
+#endif
+#endif /* PNG_1_0_X */
+
/* These are currently experimental features, define them if you want */
/* very little testing */
/*
-#define PNG_READ_16_TO_8_ACCURATE_SCALE_SUPPORTED
-#define PNG_USER_MEM_SUPPORTED
+#ifdef PNG_READ_SUPPORTED
+# ifndef PNG_READ_16_TO_8_ACCURATE_SCALE_SUPPORTED
+# define PNG_READ_16_TO_8_ACCURATE_SCALE_SUPPORTED
+# endif
+#endif
*/
/* This is only for PowerPC big-endian and 680x0 systems */
/* some testing */
/*
-#define PNG_READ_BIG_ENDIAN_SUPPORTED
+#ifdef PNG_READ_SUPPORTED
+# ifndef PNG_PNG_READ_BIG_ENDIAN_SUPPORTED
+# define PNG_READ_BIG_ENDIAN_SUPPORTED
+# endif
+#endif
+*/
+
+/* Buggy compilers (e.g., gcc 2.7.2.2) need this */
+/*
+#define PNG_NO_POINTER_INDEXING
*/
/* These functions are turned off by default, as they will be phased out. */
* a bit smaller.
*/
-#if !defined(PNG_READ_ANCILLARY_CHUNKS_NOT_SUPPORTED) && \
+#if defined(PNG_READ_SUPPORTED) && \
+ !defined(PNG_READ_ANCILLARY_CHUNKS_NOT_SUPPORTED) && \
!defined(PNG_NO_READ_ANCILLARY_CHUNKS)
-#define PNG_READ_ANCILLARY_CHUNKS_SUPPORTED
+# define PNG_READ_ANCILLARY_CHUNKS_SUPPORTED
#endif
-#if !defined(PNG_WRITE_ANCILLARY_CHUNKS_NOT_SUPPORTED) && \
+
+#if defined(PNG_WRITE_SUPPORTED) && \
+ !defined(PNG_WRITE_ANCILLARY_CHUNKS_NOT_SUPPORTED) && \
!defined(PNG_NO_WRITE_ANCILLARY_CHUNKS)
-#define PNG_WRITE_ANCILLARY_CHUNKS_SUPPORTED
+# define PNG_WRITE_ANCILLARY_CHUNKS_SUPPORTED
#endif
#ifdef PNG_READ_ANCILLARY_CHUNKS_SUPPORTED
+
+#ifdef PNG_NO_READ_TEXT
+# define PNG_NO_READ_iTXt
+# define PNG_NO_READ_tEXt
+# define PNG_NO_READ_zTXt
+#endif
#ifndef PNG_NO_READ_bKGD
-#define PNG_READ_bKGD_SUPPORTED
+# define PNG_READ_bKGD_SUPPORTED
+# define PNG_bKGD_SUPPORTED
#endif
#ifndef PNG_NO_READ_cHRM
-#define PNG_READ_cHRM_SUPPORTED
+# define PNG_READ_cHRM_SUPPORTED
+# define PNG_cHRM_SUPPORTED
#endif
#ifndef PNG_NO_READ_gAMA
-#define PNG_READ_gAMA_SUPPORTED
+# define PNG_READ_gAMA_SUPPORTED
+# define PNG_gAMA_SUPPORTED
#endif
#ifndef PNG_NO_READ_hIST
-#define PNG_READ_hIST_SUPPORTED
+# define PNG_READ_hIST_SUPPORTED
+# define PNG_hIST_SUPPORTED
+#endif
+#ifndef PNG_NO_READ_iCCP
+# define PNG_READ_iCCP_SUPPORTED
+# define PNG_iCCP_SUPPORTED
+#endif
+#ifndef PNG_NO_READ_iTXt
+# ifndef PNG_READ_iTXt_SUPPORTED
+# define PNG_READ_iTXt_SUPPORTED
+# endif
+# ifndef PNG_iTXt_SUPPORTED
+# define PNG_iTXt_SUPPORTED
+# endif
#endif
#ifndef PNG_NO_READ_oFFs
-#define PNG_READ_oFFs_SUPPORTED
+# define PNG_READ_oFFs_SUPPORTED
+# define PNG_oFFs_SUPPORTED
#endif
#ifndef PNG_NO_READ_pCAL
-#define PNG_READ_pCAL_SUPPORTED
+# define PNG_READ_pCAL_SUPPORTED
+# define PNG_pCAL_SUPPORTED
+#endif
+#ifndef PNG_NO_READ_sCAL
+# define PNG_READ_sCAL_SUPPORTED
+# define PNG_sCAL_SUPPORTED
#endif
#ifndef PNG_NO_READ_pHYs
-#define PNG_READ_pHYs_SUPPORTED
+# define PNG_READ_pHYs_SUPPORTED
+# define PNG_pHYs_SUPPORTED
#endif
#ifndef PNG_NO_READ_sBIT
-#define PNG_READ_sBIT_SUPPORTED
+# define PNG_READ_sBIT_SUPPORTED
+# define PNG_sBIT_SUPPORTED
+#endif
+#ifndef PNG_NO_READ_sPLT
+# define PNG_READ_sPLT_SUPPORTED
+# define PNG_sPLT_SUPPORTED
#endif
#ifndef PNG_NO_READ_sRGB
-#define PNG_READ_sRGB_SUPPORTED
+# define PNG_READ_sRGB_SUPPORTED
+# define PNG_sRGB_SUPPORTED
#endif
#ifndef PNG_NO_READ_tEXt
-#define PNG_READ_tEXt_SUPPORTED
+# define PNG_READ_tEXt_SUPPORTED
+# define PNG_tEXt_SUPPORTED
#endif
#ifndef PNG_NO_READ_tIME
-#define PNG_READ_tIME_SUPPORTED
+# define PNG_READ_tIME_SUPPORTED
+# define PNG_tIME_SUPPORTED
#endif
#ifndef PNG_NO_READ_tRNS
-#define PNG_READ_tRNS_SUPPORTED
+# define PNG_READ_tRNS_SUPPORTED
+# define PNG_tRNS_SUPPORTED
#endif
#ifndef PNG_NO_READ_zTXt
-#define PNG_READ_zTXt_SUPPORTED
+# define PNG_READ_zTXt_SUPPORTED
+# define PNG_zTXt_SUPPORTED
+#endif
+#ifndef PNG_NO_READ_UNKNOWN_CHUNKS
+# define PNG_READ_UNKNOWN_CHUNKS_SUPPORTED
+# ifndef PNG_UNKNOWN_CHUNKS_SUPPORTED
+# define PNG_UNKNOWN_CHUNKS_SUPPORTED
+# endif
+# ifndef PNG_NO_HANDLE_AS_UNKNOWN
+# define PNG_HANDLE_AS_UNKNOWN_SUPPORTED
+# endif
+#endif
+#if !defined(PNG_NO_READ_USER_CHUNKS) && \
+ defined(PNG_READ_UNKNOWN_CHUNKS_SUPPORTED)
+# define PNG_READ_USER_CHUNKS_SUPPORTED
+# define PNG_USER_CHUNKS_SUPPORTED
+# ifdef PNG_NO_READ_UNKNOWN_CHUNKS
+# undef PNG_NO_READ_UNKNOWN_CHUNKS
+# endif
+# ifdef PNG_NO_HANDLE_AS_UNKNOWN
+# undef PNG_NO_HANDLE_AS_UNKNOWN
+# endif
#endif
#ifndef PNG_NO_READ_OPT_PLTE
-#define PNG_READ_OPT_PLTE_SUPPORTED /* only affects support of the optional */
-#endif /* PLTE chunk in RGB and RGBA images */
+# define PNG_READ_OPT_PLTE_SUPPORTED /* only affects support of the */
+#endif /* optional PLTE chunk in RGB and RGBA images */
+#if defined(PNG_READ_iTXt_SUPPORTED) || defined(PNG_READ_tEXt_SUPPORTED) || \
+ defined(PNG_READ_zTXt_SUPPORTED)
+# define PNG_READ_TEXT_SUPPORTED
+# define PNG_TEXT_SUPPORTED
+#endif
+
#endif /* PNG_READ_ANCILLARY_CHUNKS_SUPPORTED */
#ifdef PNG_WRITE_ANCILLARY_CHUNKS_SUPPORTED
+
+#ifdef PNG_NO_WRITE_TEXT
+# define PNG_NO_WRITE_iTXt
+# define PNG_NO_WRITE_tEXt
+# define PNG_NO_WRITE_zTXt
+#endif
#ifndef PNG_NO_WRITE_bKGD
-#define PNG_WRITE_bKGD_SUPPORTED
+# define PNG_WRITE_bKGD_SUPPORTED
+# ifndef PNG_bKGD_SUPPORTED
+# define PNG_bKGD_SUPPORTED
+# endif
#endif
#ifndef PNG_NO_WRITE_cHRM
-#define PNG_WRITE_cHRM_SUPPORTED
+# define PNG_WRITE_cHRM_SUPPORTED
+# ifndef PNG_cHRM_SUPPORTED
+# define PNG_cHRM_SUPPORTED
+# endif
#endif
#ifndef PNG_NO_WRITE_gAMA
-#define PNG_WRITE_gAMA_SUPPORTED
+# define PNG_WRITE_gAMA_SUPPORTED
+# ifndef PNG_gAMA_SUPPORTED
+# define PNG_gAMA_SUPPORTED
+# endif
#endif
#ifndef PNG_NO_WRITE_hIST
-#define PNG_WRITE_hIST_SUPPORTED
+# define PNG_WRITE_hIST_SUPPORTED
+# ifndef PNG_hIST_SUPPORTED
+# define PNG_hIST_SUPPORTED
+# endif
+#endif
+#ifndef PNG_NO_WRITE_iCCP
+# define PNG_WRITE_iCCP_SUPPORTED
+# ifndef PNG_iCCP_SUPPORTED
+# define PNG_iCCP_SUPPORTED
+# endif
+#endif
+#ifndef PNG_NO_WRITE_iTXt
+# ifndef PNG_WRITE_iTXt_SUPPORTED
+# define PNG_WRITE_iTXt_SUPPORTED
+# endif
+# ifndef PNG_iTXt_SUPPORTED
+# define PNG_iTXt_SUPPORTED
+# endif
#endif
#ifndef PNG_NO_WRITE_oFFs
-#define PNG_WRITE_oFFs_SUPPORTED
+# define PNG_WRITE_oFFs_SUPPORTED
+# ifndef PNG_oFFs_SUPPORTED
+# define PNG_oFFs_SUPPORTED
+# endif
#endif
#ifndef PNG_NO_WRITE_pCAL
-#define PNG_WRITE_pCAL_SUPPORTED
+# define PNG_WRITE_pCAL_SUPPORTED
+# ifndef PNG_pCAL_SUPPORTED
+# define PNG_pCAL_SUPPORTED
+# endif
+#endif
+#ifndef PNG_NO_WRITE_sCAL
+# define PNG_WRITE_sCAL_SUPPORTED
+# ifndef PNG_sCAL_SUPPORTED
+# define PNG_sCAL_SUPPORTED
+# endif
#endif
#ifndef PNG_NO_WRITE_pHYs
-#define PNG_WRITE_pHYs_SUPPORTED
+# define PNG_WRITE_pHYs_SUPPORTED
+# ifndef PNG_pHYs_SUPPORTED
+# define PNG_pHYs_SUPPORTED
+# endif
#endif
#ifndef PNG_NO_WRITE_sBIT
-#define PNG_WRITE_sBIT_SUPPORTED
+# define PNG_WRITE_sBIT_SUPPORTED
+# ifndef PNG_sBIT_SUPPORTED
+# define PNG_sBIT_SUPPORTED
+# endif
+#endif
+#ifndef PNG_NO_WRITE_sPLT
+# define PNG_WRITE_sPLT_SUPPORTED
+# ifndef PNG_sPLT_SUPPORTED
+# define PNG_sPLT_SUPPORTED
+# endif
#endif
#ifndef PNG_NO_WRITE_sRGB
-#define PNG_WRITE_sRGB_SUPPORTED
+# define PNG_WRITE_sRGB_SUPPORTED
+# ifndef PNG_sRGB_SUPPORTED
+# define PNG_sRGB_SUPPORTED
+# endif
#endif
#ifndef PNG_NO_WRITE_tEXt
-#define PNG_WRITE_tEXt_SUPPORTED
+# define PNG_WRITE_tEXt_SUPPORTED
+# ifndef PNG_tEXt_SUPPORTED
+# define PNG_tEXt_SUPPORTED
+# endif
#endif
#ifndef PNG_NO_WRITE_tIME
-#define PNG_WRITE_tIME_SUPPORTED
+# define PNG_WRITE_tIME_SUPPORTED
+# ifndef PNG_tIME_SUPPORTED
+# define PNG_tIME_SUPPORTED
+# endif
#endif
#ifndef PNG_NO_WRITE_tRNS
-#define PNG_WRITE_tRNS_SUPPORTED
+# define PNG_WRITE_tRNS_SUPPORTED
+# ifndef PNG_tRNS_SUPPORTED
+# define PNG_tRNS_SUPPORTED
+# endif
#endif
#ifndef PNG_NO_WRITE_zTXt
-#define PNG_WRITE_zTXt_SUPPORTED
+# define PNG_WRITE_zTXt_SUPPORTED
+# ifndef PNG_zTXt_SUPPORTED
+# define PNG_zTXt_SUPPORTED
+# endif
#endif
+#ifndef PNG_NO_WRITE_UNKNOWN_CHUNKS
+# define PNG_WRITE_UNKNOWN_CHUNKS_SUPPORTED
+# ifndef PNG_UNKNOWN_CHUNKS_SUPPORTED
+# define PNG_UNKNOWN_CHUNKS_SUPPORTED
+# endif
+# ifndef PNG_NO_HANDLE_AS_UNKNOWN
+# ifndef PNG_HANDLE_AS_UNKNOWN_SUPPORTED
+# define PNG_HANDLE_AS_UNKNOWN_SUPPORTED
+# endif
+# endif
+#endif
+#if defined(PNG_WRITE_iTXt_SUPPORTED) || defined(PNG_WRITE_tEXt_SUPPORTED) || \
+ defined(PNG_WRITE_zTXt_SUPPORTED)
+# define PNG_WRITE_TEXT_SUPPORTED
+# ifndef PNG_TEXT_SUPPORTED
+# define PNG_TEXT_SUPPORTED
+# endif
+#endif
+
#endif /* PNG_WRITE_ANCILLARY_CHUNKS_SUPPORTED */
+/* Turn this off to disable png_read_png() and
+ * png_write_png() and leave the row_pointers member
+ * out of the info structure.
+ */
+#ifndef PNG_NO_INFO_IMAGE
+# define PNG_INFO_IMAGE_SUPPORTED
+#endif
+
/* need the time information for reading tIME chunks */
-#if defined(PNG_READ_tIME_SUPPORTED) || defined(PNG_WRITE_tIME_SUPPORTED)
-#include <time.h>
+#if defined(PNG_tIME_SUPPORTED)
+# if !defined(_WIN32_WCE)
+ /* "time.h" functions are not supported on WindowsCE */
+# include <time.h>
+# endif
#endif
/* Some typedefs to get us started. These should be safe on most of the
/* Separate compiler dependencies (problem here is that zlib.h always
defines FAR. (SJT) */
#ifdef __BORLANDC__
-#if defined(__LARGE__) || defined(__HUGE__) || defined(__COMPACT__)
-#define LDATA 1
-#else
-#define LDATA 0
-#endif
-
-#if !defined(__WIN32__) && !defined(__FLAT__)
-#define PNG_MAX_MALLOC_64K
-#if (LDATA != 1)
-#ifndef FAR
-#define FAR __far
-#endif
-#define USE_FAR_KEYWORD
-#endif /* LDATA != 1 */
-
-/* Possibly useful for moving data out of default segment.
- * Uncomment it if you want. Could also define FARDATA as
- * const if your compiler supports it. (SJT)
-# define FARDATA FAR
- */
-#endif /* __WIN32__, __FLAT__ */
-
+# if defined(__LARGE__) || defined(__HUGE__) || defined(__COMPACT__)
+# define LDATA 1
+# else
+# define LDATA 0
+# endif
+ /* GRR: why is Cygwin in here? Cygwin is not Borland C... */
+# if !defined(__WIN32__) && !defined(__FLAT__) && !defined(__CYGWIN__)
+# define PNG_MAX_MALLOC_64K
+# if (LDATA != 1)
+# ifndef FAR
+# define FAR __far
+# endif
+# define USE_FAR_KEYWORD
+# endif /* LDATA != 1 */
+ /* Possibly useful for moving data out of default segment.
+ * Uncomment it if you want. Could also define FARDATA as
+ * const if your compiler supports it. (SJT)
+# define FARDATA FAR
+ */
+# endif /* __WIN32__, __FLAT__, __CYGWIN__ */
#endif /* __BORLANDC__ */
/* MSC Medium model */
#if defined(FAR)
# if defined(M_I86MM)
-# define USE_FAR_KEYWORD
-# define FARDATA FAR
-# include <dos.h>
+# define USE_FAR_KEYWORD
+# define FARDATA FAR
+# include <dos.h>
# endif
#endif
/* SJT: default case */
#ifndef FAR
-# define FAR
+# define FAR
#endif
/* At this point FAR is always defined */
#ifndef FARDATA
-#define FARDATA
+# define FARDATA
#endif
+/* Typedef for floating-point numbers that are converted
+ to fixed-point with a multiple of 100,000, e.g., int_gamma */
+typedef png_int_32 png_fixed_point;
+
/* Add typedefs for pointers */
typedef void FAR * png_voidp;
typedef png_byte FAR * png_bytep;
typedef png_int_16 FAR * png_int_16p;
typedef PNG_CONST char FAR * png_const_charp;
typedef char FAR * png_charp;
+typedef png_fixed_point FAR * png_fixed_point_p;
+
+#ifndef PNG_NO_STDIO
+#if defined(_WIN32_WCE)
+typedef HANDLE png_FILE_p;
+#else
+typedef FILE * png_FILE_p;
+#endif
+#endif
+
+#ifdef PNG_FLOATING_POINT_SUPPORTED
typedef double FAR * png_doublep;
+#endif
/* Pointers to pointers; i.e. arrays */
typedef png_byte FAR * FAR * png_bytepp;
typedef png_int_16 FAR * FAR * png_int_16pp;
typedef PNG_CONST char FAR * FAR * png_const_charpp;
typedef char FAR * FAR * png_charpp;
+typedef png_fixed_point FAR * FAR * png_fixed_point_pp;
+#ifdef PNG_FLOATING_POINT_SUPPORTED
typedef double FAR * FAR * png_doublepp;
+#endif
-/* Pointers to pointers to pointers; i.e. pointer to array */
+/* Pointers to pointers to pointers; i.e., pointer to array */
typedef char FAR * FAR * FAR * png_charppp;
/* libpng typedefs for types in zlib. If zlib changes
typedef charf * FAR * png_zcharpp;
typedef z_stream FAR * png_zstreamp;
-/* allow for compilation as dll under MS Windows */
-#ifdef __WIN32DLL__
-#define PNG_EXPORT(type,symbol) __declspec(dllexport) type symbol
+/*
+ * Define PNG_BUILD_DLL if the module being built is a Windows
+ * LIBPNG DLL.
+ *
+ * Define PNG_USE_DLL if you want to *link* to the Windows LIBPNG DLL.
+ * It is equivalent to Microsoft predefined macro _DLL that is
+ * automatically defined when you compile using the share
+ * version of the CRT (C Run-Time library)
+ *
+ * The cygwin mods make this behavior a little different:
+ * Define PNG_BUILD_DLL if you are building a dll for use with cygwin
+ * Define PNG_STATIC if you are building a static library for use with cygwin,
+ * -or- if you are building an application that you want to link to the
+ * static library.
+ * PNG_USE_DLL is defined by default (no user action needed) unless one of
+ * the other flags is defined.
+ */
+
+#if !defined(PNG_DLL) && (defined(PNG_BUILD_DLL) || defined(PNG_USE_DLL))
+# define PNG_DLL
+#endif
+/* If CYGWIN, then disallow GLOBAL ARRAYS unless building a static lib.
+ * When building a static lib, default to no GLOBAL ARRAYS, but allow
+ * command-line override
+ */
+#if defined(__CYGWIN__)
+# if !defined(PNG_STATIC)
+# if defined(PNG_USE_GLOBAL_ARRAYS)
+# undef PNG_USE_GLOBAL_ARRAYS
+# endif
+# if !defined(PNG_USE_LOCAL_ARRAYS)
+# define PNG_USE_LOCAL_ARRAYS
+# endif
+# else
+# if defined(PNG_USE_LOCAL_ARRAYS) || defined(PNG_NO_GLOBAL_ARRAYS)
+# if defined(PNG_USE_GLOBAL_ARRAYS)
+# undef PNG_USE_GLOBAL_ARRAYS
+# endif
+# endif
+# endif
+# if !defined(PNG_USE_LOCAL_ARRAYS) && !defined(PNG_USE_GLOBAL_ARRAYS)
+# define PNG_USE_LOCAL_ARRAYS
+# endif
#endif
-/* allow for compilation as dll with BORLAND C++ 5.0 */
-#if defined(__BORLANDC__) && defined(_Windows) && defined(__DLL__)
-# define PNG_EXPORT(type,symbol) type _export symbol
+/* Do not use global arrays (helps with building DLL's)
+ * They are no longer used in libpng itself, since version 1.0.5c,
+ * but might be required for some pre-1.0.5c applications.
+ */
+#if !defined(PNG_USE_LOCAL_ARRAYS) && !defined(PNG_USE_GLOBAL_ARRAYS)
+# if defined(PNG_NO_GLOBAL_ARRAYS) || (defined(__GNUC__) && defined(PNG_DLL))
+# define PNG_USE_LOCAL_ARRAYS
+# else
+# define PNG_USE_GLOBAL_ARRAYS
+# endif
+#endif
+
+#if defined(__CYGWIN__)
+# undef PNGAPI
+# define PNGAPI __cdecl
+# undef PNG_IMPEXP
+# define PNG_IMPEXP
+#endif
+
+/* If you define PNGAPI, e.g., with compiler option "-DPNGAPI=__stdcall",
+ * you may get warnings regarding the linkage of png_zalloc and png_zfree.
+ * Don't ignore those warnings; you must also reset the default calling
+ * convention in your compiler to match your PNGAPI, and you must build
+ * zlib and your applications the same way you build libpng.
+ */
+
+#ifndef PNGAPI
+
+#if defined(__MINGW32__) && !defined(PNG_MODULEDEF)
+# ifndef PNG_NO_MODULEDEF
+# define PNG_NO_MODULEDEF
+# endif
#endif
-/* allow for compilation as shared lib under BeOS */
-#ifdef __BEOSDLL__
-#define PNG_EXPORT(type,symbol) __declspec(export) type symbol
+#if !defined(PNG_IMPEXP) && defined(PNG_BUILD_DLL) && !defined(PNG_NO_MODULEDEF)
+# define PNG_IMPEXP
+#endif
+
+#if defined(PNG_DLL) || defined(_DLL) || defined(__DLL__ ) || \
+ (( defined(_Windows) || defined(_WINDOWS) || \
+ defined(WIN32) || defined(_WIN32) || defined(__WIN32__) ))
+
+# if defined(__GNUC__) || (defined (_MSC_VER) && (_MSC_VER >= 800))
+# define PNGAPI __cdecl
+# else
+# define PNGAPI _cdecl
+# endif
+
+# if !defined(PNG_IMPEXP) && (!defined(PNG_DLL) || \
+ 0 /* WINCOMPILER_WITH_NO_SUPPORT_FOR_DECLIMPEXP */)
+# define PNG_IMPEXP
+# endif
+
+# if !defined(PNG_IMPEXP)
+
+# define PNG_EXPORT_TYPE1(type,symbol) PNG_IMPEXP type PNGAPI symbol
+# define PNG_EXPORT_TYPE2(type,symbol) type PNG_IMPEXP PNGAPI symbol
+
+ /* Borland/Microsoft */
+# if defined(_MSC_VER) || defined(__BORLANDC__)
+# if (_MSC_VER >= 800) || (__BORLANDC__ >= 0x500)
+# define PNG_EXPORT PNG_EXPORT_TYPE1
+# else
+# define PNG_EXPORT PNG_EXPORT_TYPE2
+# if defined(PNG_BUILD_DLL)
+# define PNG_IMPEXP __export
+# else
+# define PNG_IMPEXP /*__import */ /* doesn't exist AFAIK in
+ VC++ */
+# endif /* Exists in Borland C++ for
+ C++ classes (== huge) */
+# endif
+# endif
+
+# if !defined(PNG_IMPEXP)
+# if defined(PNG_BUILD_DLL)
+# define PNG_IMPEXP __declspec(dllexport)
+# else
+# define PNG_IMPEXP __declspec(dllimport)
+# endif
+# endif
+# endif /* PNG_IMPEXP */
+#else /* !(DLL || non-cygwin WINDOWS) */
+# if (defined(__IBMC__) || defined(IBMCPP__)) && defined(__OS2__)
+# define PNGAPI _System
+# define PNG_IMPEXP
+# else
+# if 0 /* ... other platforms, with other meanings */
+# else
+# define PNGAPI
+# define PNG_IMPEXP
+# endif
+# endif
+#endif
+#endif
+
+#ifndef PNGAPI
+# define PNGAPI
+#endif
+#ifndef PNG_IMPEXP
+# define PNG_IMPEXP
#endif
#ifndef PNG_EXPORT
-#define PNG_EXPORT(type,symbol) type symbol
+# define PNG_EXPORT(type,symbol) PNG_IMPEXP type PNGAPI symbol
#endif
+#ifdef PNG_USE_GLOBAL_ARRAYS
+# ifndef PNG_EXPORT_VAR
+# define PNG_EXPORT_VAR(type) extern PNG_IMPEXP type
+# endif
+#endif
-/* User may want to use these so not in PNG_INTERNAL. Any library functions
- * that are passed far data must be model independent.
+/* User may want to use these so they are not in PNG_INTERNAL. Any library
+ * functions that are passed far data must be model independent.
*/
+#ifndef PNG_ABORT
+# define PNG_ABORT() abort()
+#endif
+
+#ifdef PNG_SETJMP_SUPPORTED
+# define png_jmpbuf(png_ptr) ((png_ptr)->jmpbuf)
+#else
+# define png_jmpbuf(png_ptr) \
+ (LIBPNG_WAS_COMPILED_WITH__PNG_SETJMP_NOT_SUPPORTED)
+#endif
+
#if defined(USE_FAR_KEYWORD) /* memory model independent fns */
/* use this to make far-to-near assignments */
-# define CHECK 1
-# define NOCHECK 0
-# define CVT_PTR(ptr) (png_far_to_near(png_ptr,ptr,CHECK))
-# define CVT_PTR_NOCHECK(ptr) (png_far_to_near(png_ptr,ptr,NOCHECK))
-# define png_strcpy _fstrcpy
-# define png_strlen _fstrlen
-# define png_memcmp _fmemcmp /* SJT: added */
-# define png_memcpy _fmemcpy
-# define png_memset _fmemset
+# define CHECK 1
+# define NOCHECK 0
+# define CVT_PTR(ptr) (png_far_to_near(png_ptr,ptr,CHECK))
+# define CVT_PTR_NOCHECK(ptr) (png_far_to_near(png_ptr,ptr,NOCHECK))
+# define png_strcpy _fstrcpy
+# define png_strlen _fstrlen
+# define png_memcmp _fmemcmp /* SJT: added */
+# define png_memcpy _fmemcpy
+# define png_memset _fmemset
#else /* use the usual functions */
-# define CVT_PTR(ptr) (ptr)
-# define CVT_PTR_NOCHECK(ptr) (ptr)
-# define png_strcpy strcpy
-# define png_strlen strlen
-# define png_memcmp memcmp /* SJT: added */
-# define png_memcpy memcpy
-# define png_memset memset
+# define CVT_PTR(ptr) (ptr)
+# define CVT_PTR_NOCHECK(ptr) (ptr)
+# define png_strcpy strcpy
+# define png_strlen strlen
+# define png_memcmp memcmp /* SJT: added */
+# define png_memcpy memcpy
+# define png_memset memset
#endif
/* End of memory model independent support */
-/* Just a double check that someone hasn't tried to define something
+/* Just a little check that someone hasn't tried to define something
* contradictory.
*/
#if (PNG_ZBUF_SIZE > 65536) && defined(PNG_MAX_MALLOC_64K)
-#undef PNG_ZBUF_SIZE
-#define PNG_ZBUF_SIZE 65536
+# undef PNG_ZBUF_SIZE
+# define PNG_ZBUF_SIZE 65536
+#endif
+
+#ifdef PNG_READ_SUPPORTED
+/* Prior to libpng-1.0.9, this block was in pngasmrd.h */
+#if defined(PNG_INTERNAL)
+
+/* These are the default thresholds before the MMX code kicks in; if either
+ * rowbytes or bitdepth is below the threshold, plain C code is used. These
+ * can be overridden at runtime via the png_set_mmx_thresholds() call in
+ * libpng 1.2.0 and later. The values below were chosen by Intel.
+ */
+
+#ifndef PNG_MMX_ROWBYTES_THRESHOLD_DEFAULT
+# define PNG_MMX_ROWBYTES_THRESHOLD_DEFAULT 128 /* >= */
+#endif
+#ifndef PNG_MMX_BITDEPTH_THRESHOLD_DEFAULT
+# define PNG_MMX_BITDEPTH_THRESHOLD_DEFAULT 9 /* >= */
#endif
+/* Set this in the makefile for VC++ on Pentium, not here. */
+/* Platform must be Pentium. Makefile must assemble and load pngvcrd.c .
+ * MMX will be detected at run time and used if present.
+ */
+#ifdef PNG_USE_PNGVCRD
+# define PNG_HAVE_ASSEMBLER_COMBINE_ROW
+# define PNG_HAVE_ASSEMBLER_READ_INTERLACE
+# define PNG_HAVE_ASSEMBLER_READ_FILTER_ROW
+#endif
+
+/* Set this in the makefile for gcc/as on Pentium, not here. */
+/* Platform must be Pentium. Makefile must assemble and load pnggccrd.c .
+ * MMX will be detected at run time and used if present.
+ */
+#ifdef PNG_USE_PNGGCCRD
+# define PNG_HAVE_ASSEMBLER_COMBINE_ROW
+# define PNG_HAVE_ASSEMBLER_READ_INTERLACE
+# define PNG_HAVE_ASSEMBLER_READ_FILTER_ROW
+#endif
+/* - see pnggccrd.c for info about what is currently enabled */
+
+#endif /* PNG_INTERNAL */
+#endif /* PNG_READ_SUPPORTED */
+
#endif /* PNGCONF_H */
/* pngerror.c - stub functions for i/o and memory allocation
*
- * libpng 1.0.3 - January 14, 1999
+ * libpng 1.2.4 - July 8, 2002
* For conditions of distribution and use, see copyright notice in png.h
- * Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.
- * Copyright (c) 1996, 1997 Andreas Dilger
- * Copyright (c) 1998, 1999 Glenn Randers-Pehrson
+ * Copyright (c) 1998-2002 Glenn Randers-Pehrson
+ * (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger)
+ * (Version 0.88 Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.)
*
* This file provides a location for all error handling. Users who
* need special error handling are expected to write replacement functions
#define PNG_INTERNAL
#include "png.h"
-static void png_default_error PNGARG((png_structp png_ptr,
- png_const_charp message));
-static void png_default_warning PNGARG((png_structp png_ptr,
- png_const_charp message));
+static void /* PRIVATE */
+png_default_error PNGARG((png_structp png_ptr,
+ png_const_charp error_message));
+static void /* PRIVATE */
+png_default_warning PNGARG((png_structp png_ptr,
+ png_const_charp warning_message));
/* This function is called whenever there is a fatal error. This function
* should not be changed. If there is a need to handle errors differently,
* you should supply a replacement error function and use png_set_error_fn()
* to replace the error function at run-time.
*/
-void
-png_error(png_structp png_ptr, png_const_charp message)
+void PNGAPI
+png_error(png_structp png_ptr, png_const_charp error_message)
{
+#ifdef PNG_ERROR_NUMBERS_SUPPORTED
+ char msg[16];
+ if (png_ptr->flags&(PNG_FLAG_STRIP_ERROR_NUMBERS|PNG_FLAG_STRIP_ERROR_TEXT))
+ {
+ int offset = 0;
+ if (*error_message == '#')
+ {
+ for (offset=1; offset<15; offset++)
+ if (*(error_message+offset) == ' ')
+ break;
+ if (png_ptr->flags&PNG_FLAG_STRIP_ERROR_TEXT)
+ {
+ int i;
+ for (i=0; i<offset-1; i++)
+ msg[i]=error_message[i+1];
+ msg[i]='\0';
+ error_message=msg;
+ }
+ else
+ error_message+=offset;
+ }
+ else
+ {
+ if (png_ptr->flags&PNG_FLAG_STRIP_ERROR_TEXT)
+ {
+ msg[0]='0';
+ msg[1]='\0';
+ error_message=msg;
+ }
+ }
+ }
+#endif
if (png_ptr->error_fn != NULL)
- (*(png_ptr->error_fn))(png_ptr, message);
+ (*(png_ptr->error_fn))(png_ptr, error_message);
/* if the following returns or doesn't exist, use the default function,
which will not return */
- png_default_error(png_ptr, message);
+ png_default_error(png_ptr, error_message);
}
/* This function is called whenever there is a non-fatal error. This function
* you should supply a replacement warning function and use
* png_set_error_fn() to replace the warning function at run-time.
*/
-void
-png_warning(png_structp png_ptr, png_const_charp message)
+void PNGAPI
+png_warning(png_structp png_ptr, png_const_charp warning_message)
{
+ int offset = 0;
+#ifdef PNG_ERROR_NUMBERS_SUPPORTED
+ if (png_ptr->flags&(PNG_FLAG_STRIP_ERROR_NUMBERS|PNG_FLAG_STRIP_ERROR_TEXT))
+#endif
+ {
+ if (*warning_message == '#')
+ {
+ for (offset=1; offset<15; offset++)
+ if (*(warning_message+offset) == ' ')
+ break;
+ }
+ }
if (png_ptr->warning_fn != NULL)
- (*(png_ptr->warning_fn))(png_ptr, message);
+ (*(png_ptr->warning_fn))(png_ptr,
+ (png_const_charp)(warning_message+offset));
else
- png_default_warning(png_ptr, message);
+ png_default_warning(png_ptr, (png_const_charp)(warning_message+offset));
}
/* These utilities are used internally to build an error message that relates
*/
#define isnonalpha(c) ((c) < 41 || (c) > 122 || ((c) > 90 && (c) < 97))
static PNG_CONST char png_digit[16] = {
- '0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'A', 'B', 'C', 'D', 'E', 'F'
-};
+ '0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'A', 'B', 'C', 'D', 'E',
+ 'F' };
-static void
-png_format_buffer(png_structp png_ptr, png_charp buffer, png_const_charp message)
+static void /* PRIVATE */
+png_format_buffer(png_structp png_ptr, png_charp buffer, png_const_charp
+ error_message)
{
int iout = 0, iin = 0;
- while (iin < 4) {
+ while (iin < 4)
+ {
int c = png_ptr->chunk_name[iin++];
- if (isnonalpha(c)) {
+ if (isnonalpha(c))
+ {
buffer[iout++] = '[';
buffer[iout++] = png_digit[(c & 0xf0) >> 4];
- buffer[iout++] = png_digit[c & 0xf];
+ buffer[iout++] = png_digit[c & 0x0f];
buffer[iout++] = ']';
- } else {
- buffer[iout++] = c;
+ }
+ else
+ {
+ buffer[iout++] = (png_byte)c;
}
}
- if (message == NULL)
+ if (error_message == NULL)
buffer[iout] = 0;
- else {
+ else
+ {
buffer[iout++] = ':';
buffer[iout++] = ' ';
- png_memcpy(buffer+iout, message, 64);
+ png_memcpy(buffer+iout, error_message, 64);
buffer[iout+63] = 0;
}
}
-void
-png_chunk_error(png_structp png_ptr, png_const_charp message)
+void PNGAPI
+png_chunk_error(png_structp png_ptr, png_const_charp error_message)
{
- char msg[16+64];
- png_format_buffer(png_ptr, msg, message);
+ char msg[18+64];
+ png_format_buffer(png_ptr, msg, error_message);
png_error(png_ptr, msg);
}
-void
-png_chunk_warning(png_structp png_ptr, png_const_charp message)
+void PNGAPI
+png_chunk_warning(png_structp png_ptr, png_const_charp warning_message)
{
- char msg[16+64];
- png_format_buffer(png_ptr, msg, message);
+ char msg[18+64];
+ png_format_buffer(png_ptr, msg, warning_message);
png_warning(png_ptr, msg);
}
* function is used by default, or if the program supplies NULL for the
* error function pointer in png_set_error_fn().
*/
-static void
-png_default_error(png_structp png_ptr, png_const_charp message)
+static void /* PRIVATE */
+png_default_error(png_structp png_ptr, png_const_charp error_message)
{
#ifndef PNG_NO_CONSOLE_IO
- fprintf(stderr, "libpng error: %s\n", message);
+#ifdef PNG_ERROR_NUMBERS_SUPPORTED
+ if (*error_message == '#')
+ {
+ int offset;
+ char error_number[16];
+ for (offset=0; offset<15; offset++)
+ {
+ error_number[offset] = *(error_message+offset+1);
+ if (*(error_message+offset) == ' ')
+ break;
+ }
+ if((offset > 1) && (offset < 15))
+ {
+ error_number[offset-1]='\0';
+ fprintf(stderr, "libpng error no. %s: %s\n", error_number,
+ error_message+offset);
+ }
+ else
+ fprintf(stderr, "libpng error: %s, offset=%d\n", error_message,offset);
+ }
+ else
+#endif
+ fprintf(stderr, "libpng error: %s\n", error_message);
+#else
+ if (error_message)
+ /* make compiler happy */ ;
#endif
-#ifdef USE_FAR_KEYWORD
+#ifdef PNG_SETJMP_SUPPORTED
+# ifdef USE_FAR_KEYWORD
{
jmp_buf jmpbuf;
png_memcpy(jmpbuf,png_ptr->jmpbuf,sizeof(jmp_buf));
longjmp(jmpbuf, 1);
}
-#else
+# else
longjmp(png_ptr->jmpbuf, 1);
+# endif
+#else
+ if (png_ptr)
+ /* make compiler happy */ ;
+ PNG_ABORT();
#endif
}
* here if you don't want them to. In the default configuration, png_ptr is
* not used, but it is passed in case it may be useful.
*/
-static void
-png_default_warning(png_structp png_ptr, png_const_charp message)
+static void /* PRIVATE */
+png_default_warning(png_structp png_ptr, png_const_charp warning_message)
{
#ifndef PNG_NO_CONSOLE_IO
- fprintf(stderr, "libpng warning: %s\n", message);
+# ifdef PNG_ERROR_NUMBERS_SUPPORTED
+ if (*warning_message == '#')
+ {
+ int offset;
+ char warning_number[16];
+ for (offset=0; offset<15; offset++)
+ {
+ warning_number[offset]=*(warning_message+offset+1);
+ if (*(warning_message+offset) == ' ')
+ break;
+ }
+ if((offset > 1) && (offset < 15))
+ {
+ warning_number[offset-1]='\0';
+ fprintf(stderr, "libpng warning no. %s: %s\n", warning_number,
+ warning_message+offset);
+ }
+ else
+ fprintf(stderr, "libpng warning: %s\n", warning_message);
+ }
+ else
+# endif
+ fprintf(stderr, "libpng warning: %s\n", warning_message);
+#else
+ if (warning_message)
+ /* appease compiler */ ;
#endif
- if (png_ptr == NULL)
+ if (png_ptr)
return;
}
* return to the calling routine or serious problems will occur. The return
* method used in the default routine calls longjmp(png_ptr->jmpbuf, 1)
*/
-void
+void PNGAPI
png_set_error_fn(png_structp png_ptr, png_voidp error_ptr,
png_error_ptr error_fn, png_error_ptr warning_fn)
{
* functions. The application should free any memory associated with this
* pointer before png_write_destroy and png_read_destroy are called.
*/
-png_voidp
+png_voidp PNGAPI
png_get_error_ptr(png_structp png_ptr)
{
return ((png_voidp)png_ptr->error_ptr);
}
-
+#ifdef PNG_ERROR_NUMBERS_SUPPORTED
+void PNGAPI
+png_set_strip_error_numbers(png_structp png_ptr, png_uint_32 strip_mode)
+{
+ if(png_ptr != NULL)
+ {
+ png_ptr->flags &=
+ ((~(PNG_FLAG_STRIP_ERROR_NUMBERS|PNG_FLAG_STRIP_ERROR_TEXT))&strip_mode);
+ }
+}
+#endif
/* pngget.c - retrieval of values from info struct
*
- * libpng 1.0.3 - January 14, 1999
+ * libpng 1.2.4 - July 8, 2002
* For conditions of distribution and use, see copyright notice in png.h
- * Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.
- * Copyright (c) 1996, 1997 Andreas Dilger
- * Copyright (c) 1998, 1999 Glenn Randers-Pehrson
+ * Copyright (c) 1998-2002 Glenn Randers-Pehrson
+ * (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger)
+ * (Version 0.88 Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.)
*/
#define PNG_INTERNAL
#include "png.h"
-png_uint_32
+png_uint_32 PNGAPI
png_get_valid(png_structp png_ptr, png_infop info_ptr, png_uint_32 flag)
{
if (png_ptr != NULL && info_ptr != NULL)
return(0);
}
-png_uint_32
+png_uint_32 PNGAPI
png_get_rowbytes(png_structp png_ptr, png_infop info_ptr)
{
if (png_ptr != NULL && info_ptr != NULL)
return(0);
}
+#if defined(PNG_INFO_IMAGE_SUPPORTED)
+png_bytepp PNGAPI
+png_get_rows(png_structp png_ptr, png_infop info_ptr)
+{
+ if (png_ptr != NULL && info_ptr != NULL)
+ return(info_ptr->row_pointers);
+ else
+ return(0);
+}
+#endif
+
#ifdef PNG_EASY_ACCESS_SUPPORTED
/* easy access to info, added in libpng-0.99 */
-png_uint_32
+png_uint_32 PNGAPI
png_get_image_width(png_structp png_ptr, png_infop info_ptr)
{
if (png_ptr != NULL && info_ptr != NULL)
return (0);
}
-png_uint_32
+png_uint_32 PNGAPI
png_get_image_height(png_structp png_ptr, png_infop info_ptr)
{
if (png_ptr != NULL && info_ptr != NULL)
return (0);
}
-png_byte
+png_byte PNGAPI
png_get_bit_depth(png_structp png_ptr, png_infop info_ptr)
{
if (png_ptr != NULL && info_ptr != NULL)
return (0);
}
-png_byte
+png_byte PNGAPI
png_get_color_type(png_structp png_ptr, png_infop info_ptr)
{
if (png_ptr != NULL && info_ptr != NULL)
return (0);
}
-png_byte
+png_byte PNGAPI
png_get_filter_type(png_structp png_ptr, png_infop info_ptr)
{
if (png_ptr != NULL && info_ptr != NULL)
return (0);
}
-png_byte
+png_byte PNGAPI
png_get_interlace_type(png_structp png_ptr, png_infop info_ptr)
{
if (png_ptr != NULL && info_ptr != NULL)
return (0);
}
-png_byte
+png_byte PNGAPI
png_get_compression_type(png_structp png_ptr, png_infop info_ptr)
{
if (png_ptr != NULL && info_ptr != NULL)
return (0);
}
-png_uint_32
+png_uint_32 PNGAPI
png_get_x_pixels_per_meter(png_structp png_ptr, png_infop info_ptr)
{
-#if defined(PNG_READ_pHYs_SUPPORTED) || defined(PNG_WRITE_pHYs_SUPPORTED)
- if (png_ptr != NULL && info_ptr != NULL && (info_ptr->valid & PNG_INFO_pHYs))
+ if (png_ptr != NULL && info_ptr != NULL)
+#if defined(PNG_pHYs_SUPPORTED)
+ if (info_ptr->valid & PNG_INFO_pHYs)
{
png_debug1(1, "in %s retrieval function\n", "png_get_x_pixels_per_meter");
if(info_ptr->phys_unit_type != PNG_RESOLUTION_METER)
return (0);
else return (info_ptr->x_pixels_per_unit);
}
- else
+#else
+ return (0);
#endif
return (0);
}
-png_uint_32
+png_uint_32 PNGAPI
png_get_y_pixels_per_meter(png_structp png_ptr, png_infop info_ptr)
{
-#if defined(PNG_READ_pHYs_SUPPORTED) || defined(PNG_WRITE_pHYs_SUPPORTED)
- if (png_ptr != NULL && info_ptr != NULL && (info_ptr->valid & PNG_INFO_pHYs))
+ if (png_ptr != NULL && info_ptr != NULL)
+#if defined(PNG_pHYs_SUPPORTED)
+ if (info_ptr->valid & PNG_INFO_pHYs)
{
png_debug1(1, "in %s retrieval function\n", "png_get_y_pixels_per_meter");
if(info_ptr->phys_unit_type != PNG_RESOLUTION_METER)
return (0);
else return (info_ptr->y_pixels_per_unit);
}
- else
+#else
+ return (0);
#endif
return (0);
}
-png_uint_32
+png_uint_32 PNGAPI
png_get_pixels_per_meter(png_structp png_ptr, png_infop info_ptr)
{
-#if defined(PNG_READ_pHYs_SUPPORTED) || defined(PNG_WRITE_pHYs_SUPPORTED)
- if (png_ptr != NULL && info_ptr != NULL && (info_ptr->valid & PNG_INFO_pHYs))
+ if (png_ptr != NULL && info_ptr != NULL)
+#if defined(PNG_pHYs_SUPPORTED)
+ if (info_ptr->valid & PNG_INFO_pHYs)
{
png_debug1(1, "in %s retrieval function\n", "png_get_pixels_per_meter");
if(info_ptr->phys_unit_type != PNG_RESOLUTION_METER ||
return (0);
else return (info_ptr->x_pixels_per_unit);
}
- else
+#else
+ return (0);
#endif
return (0);
}
-float
+#ifdef PNG_FLOATING_POINT_SUPPORTED
+float PNGAPI
png_get_pixel_aspect_ratio(png_structp png_ptr, png_infop info_ptr)
{
-#if defined(PNG_READ_pHYs_SUPPORTED) || defined(PNG_WRITE_pHYs_SUPPORTED)
- if (png_ptr != NULL && info_ptr != NULL && (info_ptr->valid & PNG_INFO_pHYs))
+ if (png_ptr != NULL && info_ptr != NULL)
+#if defined(PNG_pHYs_SUPPORTED)
+ if (info_ptr->valid & PNG_INFO_pHYs)
{
png_debug1(1, "in %s retrieval function\n", "png_get_aspect_ratio");
if (info_ptr->x_pixels_per_unit == 0)
return ((float)0.0);
else
- return ((float)info_ptr->y_pixels_per_unit
- /(float)info_ptr->x_pixels_per_unit);
+ return ((float)((float)info_ptr->y_pixels_per_unit
+ /(float)info_ptr->x_pixels_per_unit));
}
- else
+#else
+ return (0.0);
#endif
- return ((float)0.0);
+ return ((float)0.0);
}
+#endif
-png_uint_32
+png_int_32 PNGAPI
png_get_x_offset_microns(png_structp png_ptr, png_infop info_ptr)
{
-#if defined(PNG_READ_oFFs_SUPPORTED) || defined(PNG_WRITE_oFFs_SUPPORTED)
- if (png_ptr != NULL && info_ptr != NULL && (info_ptr->valid & PNG_INFO_oFFs))
+ if (png_ptr != NULL && info_ptr != NULL)
+#if defined(PNG_oFFs_SUPPORTED)
+ if (info_ptr->valid & PNG_INFO_oFFs)
{
png_debug1(1, "in %s retrieval function\n", "png_get_x_offset_microns");
if(info_ptr->offset_unit_type != PNG_OFFSET_MICROMETER)
return (0);
else return (info_ptr->x_offset);
}
- else
+#else
+ return (0);
#endif
return (0);
}
-png_uint_32
+png_int_32 PNGAPI
png_get_y_offset_microns(png_structp png_ptr, png_infop info_ptr)
{
-#if defined(PNG_READ_oFFs_SUPPORTED) || defined(PNG_WRITE_oFFs_SUPPORTED)
- if (png_ptr != NULL && info_ptr != NULL && (info_ptr->valid & PNG_INFO_oFFs))
+ if (png_ptr != NULL && info_ptr != NULL)
+#if defined(PNG_oFFs_SUPPORTED)
+ if (info_ptr->valid & PNG_INFO_oFFs)
{
png_debug1(1, "in %s retrieval function\n", "png_get_y_offset_microns");
if(info_ptr->offset_unit_type != PNG_OFFSET_MICROMETER)
return (0);
else return (info_ptr->y_offset);
}
- else
+#else
+ return (0);
#endif
return (0);
}
-png_uint_32
+png_int_32 PNGAPI
png_get_x_offset_pixels(png_structp png_ptr, png_infop info_ptr)
{
-#if defined(PNG_READ_oFFs_SUPPORTED) || defined(PNG_WRITE_oFFs_SUPPORTED)
- if (png_ptr != NULL && info_ptr != NULL && (info_ptr->valid & PNG_INFO_oFFs))
+ if (png_ptr != NULL && info_ptr != NULL)
+#if defined(PNG_oFFs_SUPPORTED)
+ if (info_ptr->valid & PNG_INFO_oFFs)
{
png_debug1(1, "in %s retrieval function\n", "png_get_x_offset_microns");
if(info_ptr->offset_unit_type != PNG_OFFSET_PIXEL)
return (0);
else return (info_ptr->x_offset);
}
- else
+#else
+ return (0);
#endif
return (0);
}
-png_uint_32
+png_int_32 PNGAPI
png_get_y_offset_pixels(png_structp png_ptr, png_infop info_ptr)
{
-#if defined(PNG_READ_oFFs_SUPPORTED) || defined(PNG_WRITE_oFFs_SUPPORTED)
- if (png_ptr != NULL && info_ptr != NULL && (info_ptr->valid & PNG_INFO_oFFs))
+ if (png_ptr != NULL && info_ptr != NULL)
+#if defined(PNG_oFFs_SUPPORTED)
+ if (info_ptr->valid & PNG_INFO_oFFs)
{
png_debug1(1, "in %s retrieval function\n", "png_get_y_offset_microns");
if(info_ptr->offset_unit_type != PNG_OFFSET_PIXEL)
return (0);
else return (info_ptr->y_offset);
}
- else
+#else
+ return (0);
#endif
return (0);
}
-#ifdef PNG_INCH_CONVERSIONS
-png_uint_32
+#if defined(PNG_INCH_CONVERSIONS) && defined(PNG_FLOATING_POINT_SUPPORTED)
+png_uint_32 PNGAPI
png_get_pixels_per_inch(png_structp png_ptr, png_infop info_ptr)
{
return ((png_uint_32)((float)png_get_pixels_per_meter(png_ptr, info_ptr)
- *.03937 +.5)
+ *.0254 +.5));
}
-png_uint_32
+png_uint_32 PNGAPI
png_get_x_pixels_per_inch(png_structp png_ptr, png_infop info_ptr)
{
return ((png_uint_32)((float)png_get_x_pixels_per_meter(png_ptr, info_ptr)
- *.03937 +.5)
+ *.0254 +.5));
}
-png_uint_32
+png_uint_32 PNGAPI
png_get_y_pixels_per_inch(png_structp png_ptr, png_infop info_ptr)
{
return ((png_uint_32)((float)png_get_y_pixels_per_meter(png_ptr, info_ptr)
- *.03937 +.5)
+ *.0254 +.5));
}
-float
+float PNGAPI
png_get_x_offset_inches(png_structp png_ptr, png_infop info_ptr)
{
return ((float)png_get_x_offset_microns(png_ptr, info_ptr)
- *.03937/1000000. +.5)
+ *.00003937);
}
-float
+float PNGAPI
png_get_y_offset_inches(png_structp png_ptr, png_infop info_ptr)
{
return ((float)png_get_y_offset_microns(png_ptr, info_ptr)
- *.03937/1000000. +.5)
+ *.00003937);
}
-#if defined(PNG_READ_pHYs_SUPPORTED)
-png_uint_32
+#if defined(PNG_pHYs_SUPPORTED)
+png_uint_32 PNGAPI
png_get_pHYs_dpi(png_structp png_ptr, png_infop info_ptr,
png_uint_32 *res_x, png_uint_32 *res_y, int *unit_type)
{
png_uint_32 retval = 0;
- if (png_ptr != NULL && info_ptr != NULL && info_ptr->valid & PNG_INFO_pHYs)
+ if (png_ptr != NULL && info_ptr != NULL && (info_ptr->valid & PNG_INFO_pHYs))
{
png_debug1(1, "in %s retrieval function\n", "pHYs");
if (res_x != NULL)
{
*unit_type = (int)info_ptr->phys_unit_type;
retval |= PNG_INFO_pHYs;
- if(unit_type == 1)
+ if(*unit_type == 1)
{
- if (res_x != NULL) *res_x = (png_uint_32)(*res_x * 39.37 + .50);
- if (res_y != NULL) *res_y = (png_uint_32)(*res_y * 39.37 + .50);
+ if (res_x != NULL) *res_x = (png_uint_32)(*res_x * .0254 + .50);
+ if (res_y != NULL) *res_y = (png_uint_32)(*res_y * .0254 + .50);
}
}
}
return (retval);
}
-#endif /* PNG_READ_pHYs_SUPPORTED */
-#endif /* PNG_INCH_CONVERSIONS */
+#endif /* PNG_pHYs_SUPPORTED */
+#endif /* PNG_INCH_CONVERSIONS && PNG_FLOATING_POINT_SUPPORTED */
/* png_get_channels really belongs in here, too, but it's been around longer */
#endif /* PNG_EASY_ACCESS_SUPPORTED */
-png_byte
+png_byte PNGAPI
png_get_channels(png_structp png_ptr, png_infop info_ptr)
{
if (png_ptr != NULL && info_ptr != NULL)
return (0);
}
-png_bytep
+png_bytep PNGAPI
png_get_signature(png_structp png_ptr, png_infop info_ptr)
{
if (png_ptr != NULL && info_ptr != NULL)
return (NULL);
}
-#if defined(PNG_READ_bKGD_SUPPORTED)
-png_uint_32
+#if defined(PNG_bKGD_SUPPORTED)
+png_uint_32 PNGAPI
png_get_bKGD(png_structp png_ptr, png_infop info_ptr,
png_color_16p *background)
{
}
#endif
-#if defined(PNG_READ_cHRM_SUPPORTED)
-png_uint_32
+#if defined(PNG_cHRM_SUPPORTED)
+#ifdef PNG_FLOATING_POINT_SUPPORTED
+png_uint_32 PNGAPI
png_get_cHRM(png_structp png_ptr, png_infop info_ptr,
double *white_x, double *white_y, double *red_x, double *red_y,
double *green_x, double *green_y, double *blue_x, double *blue_y)
return (0);
}
#endif
+#ifdef PNG_FIXED_POINT_SUPPORTED
+png_uint_32 PNGAPI
+png_get_cHRM_fixed(png_structp png_ptr, png_infop info_ptr,
+ png_fixed_point *white_x, png_fixed_point *white_y, png_fixed_point *red_x,
+ png_fixed_point *red_y, png_fixed_point *green_x, png_fixed_point *green_y,
+ png_fixed_point *blue_x, png_fixed_point *blue_y)
+{
+ if (png_ptr != NULL && info_ptr != NULL && (info_ptr->valid & PNG_INFO_cHRM))
+ {
+ png_debug1(1, "in %s retrieval function\n", "cHRM");
+ if (white_x != NULL)
+ *white_x = info_ptr->int_x_white;
+ if (white_y != NULL)
+ *white_y = info_ptr->int_y_white;
+ if (red_x != NULL)
+ *red_x = info_ptr->int_x_red;
+ if (red_y != NULL)
+ *red_y = info_ptr->int_y_red;
+ if (green_x != NULL)
+ *green_x = info_ptr->int_x_green;
+ if (green_y != NULL)
+ *green_y = info_ptr->int_y_green;
+ if (blue_x != NULL)
+ *blue_x = info_ptr->int_x_blue;
+ if (blue_y != NULL)
+ *blue_y = info_ptr->int_y_blue;
+ return (PNG_INFO_cHRM);
+ }
+ return (0);
+}
+#endif
+#endif
-#if defined(PNG_READ_gAMA_SUPPORTED)
-png_uint_32
+#if defined(PNG_gAMA_SUPPORTED)
+#ifdef PNG_FLOATING_POINT_SUPPORTED
+png_uint_32 PNGAPI
png_get_gAMA(png_structp png_ptr, png_infop info_ptr, double *file_gamma)
{
if (png_ptr != NULL && info_ptr != NULL && (info_ptr->valid & PNG_INFO_gAMA)
return (0);
}
#endif
+#ifdef PNG_FIXED_POINT_SUPPORTED
+png_uint_32 PNGAPI
+png_get_gAMA_fixed(png_structp png_ptr, png_infop info_ptr,
+ png_fixed_point *int_file_gamma)
+{
+ if (png_ptr != NULL && info_ptr != NULL && (info_ptr->valid & PNG_INFO_gAMA)
+ && int_file_gamma != NULL)
+ {
+ png_debug1(1, "in %s retrieval function\n", "gAMA");
+ *int_file_gamma = info_ptr->int_gamma;
+ return (PNG_INFO_gAMA);
+ }
+ return (0);
+}
+#endif
+#endif
-#if defined(PNG_READ_sRGB_SUPPORTED)
-png_uint_32
+#if defined(PNG_sRGB_SUPPORTED)
+png_uint_32 PNGAPI
png_get_sRGB(png_structp png_ptr, png_infop info_ptr, int *file_srgb_intent)
{
if (png_ptr != NULL && info_ptr != NULL && (info_ptr->valid & PNG_INFO_sRGB)
}
#endif
-#if defined(PNG_READ_hIST_SUPPORTED)
-png_uint_32
+#if defined(PNG_iCCP_SUPPORTED)
+png_uint_32 PNGAPI
+png_get_iCCP(png_structp png_ptr, png_infop info_ptr,
+ png_charpp name, int *compression_type,
+ png_charpp profile, png_uint_32 *proflen)
+{
+ if (png_ptr != NULL && info_ptr != NULL && (info_ptr->valid & PNG_INFO_iCCP)
+ && name != NULL && profile != NULL && proflen != NULL)
+ {
+ png_debug1(1, "in %s retrieval function\n", "iCCP");
+ *name = info_ptr->iccp_name;
+ *profile = info_ptr->iccp_profile;
+ /* compression_type is a dummy so the API won't have to change
+ if we introduce multiple compression types later. */
+ *proflen = (int)info_ptr->iccp_proflen;
+ *compression_type = (int)info_ptr->iccp_compression;
+ return (PNG_INFO_iCCP);
+ }
+ return (0);
+}
+#endif
+
+#if defined(PNG_sPLT_SUPPORTED)
+png_uint_32 PNGAPI
+png_get_sPLT(png_structp png_ptr, png_infop info_ptr,
+ png_sPLT_tpp spalettes)
+{
+ if (png_ptr != NULL && info_ptr != NULL && spalettes != NULL)
+ *spalettes = info_ptr->splt_palettes;
+ return ((png_uint_32)info_ptr->splt_palettes_num);
+}
+#endif
+
+#if defined(PNG_hIST_SUPPORTED)
+png_uint_32 PNGAPI
png_get_hIST(png_structp png_ptr, png_infop info_ptr, png_uint_16p *hist)
{
if (png_ptr != NULL && info_ptr != NULL && (info_ptr->valid & PNG_INFO_hIST)
}
#endif
-png_uint_32
+png_uint_32 PNGAPI
png_get_IHDR(png_structp png_ptr, png_infop info_ptr,
png_uint_32 *width, png_uint_32 *height, int *bit_depth,
int *color_type, int *interlace_type, int *compression_type,
*width = info_ptr->width;
*height = info_ptr->height;
*bit_depth = info_ptr->bit_depth;
+ if (info_ptr->bit_depth < 1 || info_ptr->bit_depth > 16)
+ png_error(png_ptr, "Invalid bit depth");
*color_type = info_ptr->color_type;
+ if (info_ptr->color_type > 6)
+ png_error(png_ptr, "Invalid color type");
if (compression_type != NULL)
*compression_type = info_ptr->compression_type;
if (filter_type != NULL)
channels++;
pixel_depth = *bit_depth * channels;
rowbytes_per_pixel = (pixel_depth + 7) >> 3;
- if ((*width > (png_uint_32)2147483647L/rowbytes_per_pixel))
+ if (width == 0 || *width > PNG_MAX_UINT)
+ png_error(png_ptr, "Invalid image width");
+ if (height == 0 || *height > PNG_MAX_UINT)
+ png_error(png_ptr, "Invalid image height");
+ if (*width > PNG_MAX_UINT/rowbytes_per_pixel - 64)
{
- png_warning(png_ptr,
+ png_error(png_ptr,
"Width too large for libpng to process image data.");
}
return (1);
return (0);
}
-#if defined(PNG_READ_oFFs_SUPPORTED)
-png_uint_32
+#if defined(PNG_oFFs_SUPPORTED)
+png_uint_32 PNGAPI
png_get_oFFs(png_structp png_ptr, png_infop info_ptr,
- png_uint_32 *offset_x, png_uint_32 *offset_y, int *unit_type)
+ png_int_32 *offset_x, png_int_32 *offset_y, int *unit_type)
{
if (png_ptr != NULL && info_ptr != NULL && (info_ptr->valid & PNG_INFO_oFFs)
&& offset_x != NULL && offset_y != NULL && unit_type != NULL)
}
#endif
-#if defined(PNG_READ_pCAL_SUPPORTED)
-png_uint_32
+#if defined(PNG_pCAL_SUPPORTED)
+png_uint_32 PNGAPI
png_get_pCAL(png_structp png_ptr, png_infop info_ptr,
png_charp *purpose, png_int_32 *X0, png_int_32 *X1, int *type, int *nparams,
png_charp *units, png_charpp *params)
{
- if (png_ptr != NULL && info_ptr != NULL && info_ptr->valid & PNG_INFO_pCAL &&
- purpose != NULL && X0 != NULL && X1 != NULL && type != NULL &&
+ if (png_ptr != NULL && info_ptr != NULL && (info_ptr->valid & PNG_INFO_pCAL)
+ && purpose != NULL && X0 != NULL && X1 != NULL && type != NULL &&
nparams != NULL && units != NULL && params != NULL)
{
png_debug1(1, "in %s retrieval function\n", "pCAL");
}
#endif
-#if defined(PNG_READ_pHYs_SUPPORTED)
-png_uint_32
+#if defined(PNG_sCAL_SUPPORTED)
+#ifdef PNG_FLOATING_POINT_SUPPORTED
+png_uint_32 PNGAPI
+png_get_sCAL(png_structp png_ptr, png_infop info_ptr,
+ int *unit, double *width, double *height)
+{
+ if (png_ptr != NULL && info_ptr != NULL &&
+ (info_ptr->valid & PNG_INFO_sCAL))
+ {
+ *unit = info_ptr->scal_unit;
+ *width = info_ptr->scal_pixel_width;
+ *height = info_ptr->scal_pixel_height;
+ return (PNG_INFO_sCAL);
+ }
+ return(0);
+}
+#else
+#ifdef PNG_FIXED_POINT_SUPPORTED
+png_uint_32 PNGAPI
+png_get_sCAL_s(png_structp png_ptr, png_infop info_ptr,
+ int *unit, png_charpp width, png_charpp height)
+{
+ if (png_ptr != NULL && info_ptr != NULL &&
+ (info_ptr->valid & PNG_INFO_sCAL))
+ {
+ *unit = info_ptr->scal_unit;
+ *width = info_ptr->scal_s_width;
+ *height = info_ptr->scal_s_height;
+ return (PNG_INFO_sCAL);
+ }
+ return(0);
+}
+#endif
+#endif
+#endif
+
+#if defined(PNG_pHYs_SUPPORTED)
+png_uint_32 PNGAPI
png_get_pHYs(png_structp png_ptr, png_infop info_ptr,
png_uint_32 *res_x, png_uint_32 *res_y, int *unit_type)
{
png_uint_32 retval = 0;
- if (png_ptr != NULL && info_ptr != NULL && info_ptr->valid & PNG_INFO_pHYs)
+ if (png_ptr != NULL && info_ptr != NULL &&
+ (info_ptr->valid & PNG_INFO_pHYs))
{
png_debug1(1, "in %s retrieval function\n", "pHYs");
if (res_x != NULL)
}
#endif
-png_uint_32
+png_uint_32 PNGAPI
png_get_PLTE(png_structp png_ptr, png_infop info_ptr, png_colorp *palette,
int *num_palette)
{
- if (png_ptr != NULL && info_ptr != NULL && info_ptr->valid & PNG_INFO_PLTE &&
- palette != NULL)
+ if (png_ptr != NULL && info_ptr != NULL && (info_ptr->valid & PNG_INFO_PLTE)
+ && palette != NULL)
{
png_debug1(1, "in %s retrieval function\n", "PLTE");
*palette = info_ptr->palette;
return (0);
}
-#if defined(PNG_READ_sBIT_SUPPORTED)
-png_uint_32
+#if defined(PNG_sBIT_SUPPORTED)
+png_uint_32 PNGAPI
png_get_sBIT(png_structp png_ptr, png_infop info_ptr, png_color_8p *sig_bit)
{
- if (png_ptr != NULL && info_ptr != NULL && info_ptr->valid & PNG_INFO_sBIT &&
- sig_bit != NULL)
+ if (png_ptr != NULL && info_ptr != NULL && (info_ptr->valid & PNG_INFO_sBIT)
+ && sig_bit != NULL)
{
png_debug1(1, "in %s retrieval function\n", "sBIT");
*sig_bit = &(info_ptr->sig_bit);
}
#endif
-#if defined(PNG_READ_tEXt_SUPPORTED) || defined(PNG_READ_zTXt_SUPPORTED)
-png_uint_32
+#if defined(PNG_TEXT_SUPPORTED)
+png_uint_32 PNGAPI
png_get_text(png_structp png_ptr, png_infop info_ptr, png_textp *text_ptr,
int *num_text)
{
*num_text = info_ptr->num_text;
return ((png_uint_32)info_ptr->num_text);
}
+ if (num_text != NULL)
+ *num_text = 0;
return(0);
}
#endif
-#if defined(PNG_READ_tIME_SUPPORTED)
-png_uint_32
+#if defined(PNG_tIME_SUPPORTED)
+png_uint_32 PNGAPI
png_get_tIME(png_structp png_ptr, png_infop info_ptr, png_timep *mod_time)
{
- if (png_ptr != NULL && info_ptr != NULL && info_ptr->valid & PNG_INFO_tIME &&
- mod_time != NULL)
+ if (png_ptr != NULL && info_ptr != NULL && (info_ptr->valid & PNG_INFO_tIME)
+ && mod_time != NULL)
{
png_debug1(1, "in %s retrieval function\n", "tIME");
*mod_time = &(info_ptr->mod_time);
}
#endif
-#if defined(PNG_READ_tRNS_SUPPORTED)
-png_uint_32
+#if defined(PNG_tRNS_SUPPORTED)
+png_uint_32 PNGAPI
png_get_tRNS(png_structp png_ptr, png_infop info_ptr,
png_bytep *trans, int *num_trans, png_color_16p *trans_values)
{
png_uint_32 retval = 0;
- if (png_ptr != NULL && info_ptr != NULL && info_ptr->valid & PNG_INFO_tRNS)
+ if (png_ptr != NULL && info_ptr != NULL && (info_ptr->valid & PNG_INFO_tRNS))
{
png_debug1(1, "in %s retrieval function\n", "tRNS");
if (info_ptr->color_type == PNG_COLOR_TYPE_PALETTE)
}
#endif
+#if defined(PNG_UNKNOWN_CHUNKS_SUPPORTED)
+png_uint_32 PNGAPI
+png_get_unknown_chunks(png_structp png_ptr, png_infop info_ptr,
+ png_unknown_chunkpp unknowns)
+{
+ if (png_ptr != NULL && info_ptr != NULL && unknowns != NULL)
+ *unknowns = info_ptr->unknown_chunks;
+ return ((png_uint_32)info_ptr->unknown_chunks_num);
+}
+#endif
+
#if defined(PNG_READ_RGB_TO_GRAY_SUPPORTED)
-png_byte
+png_byte PNGAPI
png_get_rgb_to_gray_status (png_structp png_ptr)
{
- return png_ptr->rgb_to_gray_status;
+ return (png_byte)(png_ptr? png_ptr->rgb_to_gray_status : 0);
+}
+#endif
+
+#if defined(PNG_USER_CHUNKS_SUPPORTED)
+png_voidp PNGAPI
+png_get_user_chunk_ptr(png_structp png_ptr)
+{
+ return (png_ptr? png_ptr->user_chunk_ptr : NULL);
}
#endif
+
+
+png_uint_32 PNGAPI
+png_get_compression_buffer_size(png_structp png_ptr)
+{
+ return (png_uint_32)(png_ptr? png_ptr->zbuf_size : 0L);
+}
+
+
+#ifndef PNG_1_0_X
+#ifdef PNG_ASSEMBLER_CODE_SUPPORTED
+/* this function was added to libpng 1.2.0 and should exist by default */
+png_uint_32 PNGAPI
+png_get_asm_flags (png_structp png_ptr)
+{
+ return (png_uint_32)(png_ptr? png_ptr->asm_flags : 0L);
+}
+
+/* this function was added to libpng 1.2.0 and should exist by default */
+png_uint_32 PNGAPI
+png_get_asm_flagmask (int flag_select)
+{
+ png_uint_32 settable_asm_flags = 0;
+
+ if (flag_select & PNG_SELECT_READ)
+ settable_asm_flags |=
+ PNG_ASM_FLAG_MMX_READ_COMBINE_ROW |
+ PNG_ASM_FLAG_MMX_READ_INTERLACE |
+ PNG_ASM_FLAG_MMX_READ_FILTER_SUB |
+ PNG_ASM_FLAG_MMX_READ_FILTER_UP |
+ PNG_ASM_FLAG_MMX_READ_FILTER_AVG |
+ PNG_ASM_FLAG_MMX_READ_FILTER_PAETH ;
+ /* no non-MMX flags yet */
+
+#if 0
+ /* GRR: no write-flags yet, either, but someday... */
+ if (flag_select & PNG_SELECT_WRITE)
+ settable_asm_flags |=
+ PNG_ASM_FLAG_MMX_WRITE_ [whatever] ;
+#endif /* 0 */
+
+ return settable_asm_flags; /* _theoretically_ settable capabilities only */
+}
+#endif /* PNG_ASSEMBLER_CODE_SUPPORTED */
+
+
+#if defined(PNG_ASSEMBLER_CODE_SUPPORTED)
+ /* GRR: could add this: && defined(PNG_MMX_CODE_SUPPORTED) */
+/* this function was added to libpng 1.2.0 */
+png_uint_32 PNGAPI
+png_get_mmx_flagmask (int flag_select, int *compilerID)
+{
+ png_uint_32 settable_mmx_flags = 0;
+
+ if (flag_select & PNG_SELECT_READ)
+ settable_mmx_flags |=
+ PNG_ASM_FLAG_MMX_READ_COMBINE_ROW |
+ PNG_ASM_FLAG_MMX_READ_INTERLACE |
+ PNG_ASM_FLAG_MMX_READ_FILTER_SUB |
+ PNG_ASM_FLAG_MMX_READ_FILTER_UP |
+ PNG_ASM_FLAG_MMX_READ_FILTER_AVG |
+ PNG_ASM_FLAG_MMX_READ_FILTER_PAETH ;
+#if 0
+ /* GRR: no MMX write support yet, but someday... */
+ if (flag_select & PNG_SELECT_WRITE)
+ settable_mmx_flags |=
+ PNG_ASM_FLAG_MMX_WRITE_ [whatever] ;
+#endif /* 0 */
+
+ if (compilerID != NULL) {
+#ifdef PNG_USE_PNGVCRD
+ *compilerID = 1; /* MSVC */
+#else
+#ifdef PNG_USE_PNGGCCRD
+ *compilerID = 2; /* gcc/gas */
+#else
+ *compilerID = -1; /* unknown (i.e., no asm/MMX code compiled) */
+#endif
+#endif
+ }
+
+ return settable_mmx_flags; /* _theoretically_ settable capabilities only */
+}
+
+/* this function was added to libpng 1.2.0 */
+png_byte PNGAPI
+png_get_mmx_bitdepth_threshold (png_structp png_ptr)
+{
+ return (png_byte)(png_ptr? png_ptr->mmx_bitdepth_threshold : 0);
+}
+
+/* this function was added to libpng 1.2.0 */
+png_uint_32 PNGAPI
+png_get_mmx_rowbytes_threshold (png_structp png_ptr)
+{
+ return (png_uint_32)(png_ptr? png_ptr->mmx_rowbytes_threshold : 0L);
+}
+#endif /* PNG_ASSEMBLER_CODE_SUPPORTED */
+#endif /* PNG_1_0_X */
/* pngmem.c - stub functions for memory allocation
*
- * libpng 1.0.3 - January 14, 1999
+ * libpng 1.2.4 - July 8, 2002
* For conditions of distribution and use, see copyright notice in png.h
- * Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.
- * Copyright (c) 1996, 1997 Andreas Dilger
- * Copyright (c) 1998, 1999 Glenn Randers-Pehrson
+ * Copyright (c) 1998-2002 Glenn Randers-Pehrson
+ * (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger)
+ * (Version 0.88 Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.)
*
* This file provides a location for all memory allocation. Users who
* need special memory handling are expected to supply replacement
/* Allocate memory for a png_struct. The malloc and memset can be replaced
by a single call to calloc() if this is thought to improve performance. */
-png_voidp
+png_voidp /* PRIVATE */
png_create_struct(int type)
{
#ifdef PNG_USER_MEM_SUPPORTED
- return (png_create_struct_2(type, NULL));
+ return (png_create_struct_2(type, png_malloc_ptr_NULL, png_voidp_NULL));
}
/* Alternate version of png_create_struct, for use with user-defined malloc. */
-png_voidp
-png_create_struct_2(int type, png_malloc_ptr malloc_fn)
+png_voidp /* PRIVATE */
+png_create_struct_2(int type, png_malloc_ptr malloc_fn, png_voidp mem_ptr)
{
#endif /* PNG_USER_MEM_SUPPORTED */
png_size_t size;
else if (type == PNG_STRUCT_PNG)
size = sizeof(png_struct);
else
- return ((png_voidp)NULL);
+ return (png_get_copyright());
#ifdef PNG_USER_MEM_SUPPORTED
if(malloc_fn != NULL)
{
- if ((struct_ptr = (*(malloc_fn))(NULL, size)) != NULL)
- png_memset(struct_ptr, 0, size);
- return (struct_ptr);
+ png_struct dummy_struct;
+ png_structp png_ptr = &dummy_struct;
+ png_ptr->mem_ptr=mem_ptr;
+ struct_ptr = (*(malloc_fn))(png_ptr, (png_uint_32)size);
}
+ else
#endif /* PNG_USER_MEM_SUPPORTED */
- if ((struct_ptr = (png_voidp)farmalloc(size)) != NULL)
- {
+ struct_ptr = (png_voidp)farmalloc(size));
+ if (struct_ptr != NULL)
png_memset(struct_ptr, 0, size);
- }
return (struct_ptr);
}
-
/* Free memory allocated by a png_create_struct() call */
-void
+void /* PRIVATE */
png_destroy_struct(png_voidp struct_ptr)
{
#ifdef PNG_USER_MEM_SUPPORTED
- png_destroy_struct_2(struct_ptr, (png_free_ptr)NULL);
+ png_destroy_struct_2(struct_ptr, png_free_ptr_NULL, png_voidp_NULL);
}
/* Free memory allocated by a png_create_struct() call */
-void
-png_destroy_struct_2(png_voidp struct_ptr, png_free_ptr free_fn)
+void /* PRIVATE */
+png_destroy_struct_2(png_voidp struct_ptr, png_free_ptr free_fn,
+ png_voidp mem_ptr)
{
#endif
if (struct_ptr != NULL)
{
png_struct dummy_struct;
png_structp png_ptr = &dummy_struct;
+ png_ptr->mem_ptr=mem_ptr;
(*(free_fn))(png_ptr, struct_ptr);
- struct_ptr = NULL;
return;
}
#endif /* PNG_USER_MEM_SUPPORTED */
farfree (struct_ptr);
- struct_ptr = NULL;
}
}
* result, we would be truncating potentially larger memory requests
* (which should cause a fatal error) and introducing major problems.
*/
-png_voidp
+
+png_voidp PNGAPI
png_malloc(png_structp png_ptr, png_uint_32 size)
{
-#ifndef PNG_USER_MEM_SUPPORTED
png_voidp ret;
-#endif
+
if (png_ptr == NULL || size == 0)
- return ((png_voidp)NULL);
+ return (NULL);
#ifdef PNG_USER_MEM_SUPPORTED
if(png_ptr->malloc_fn != NULL)
- return ((png_voidp)(*(png_ptr->malloc_fn))(png_ptr, size));
+ {
+ ret = ((png_voidp)(*(png_ptr->malloc_fn))(png_ptr, (png_size_t)size));
+ if (ret == NULL && (png_ptr->flags&PNG_FLAG_MALLOC_NULL_MEM_OK) == 0)
+ png_error(png_ptr, "Out of memory!");
+ return (ret);
+ }
else
return png_malloc_default(png_ptr, size);
}
-png_voidp
+png_voidp PNGAPI
png_malloc_default(png_structp png_ptr, png_uint_32 size)
{
png_voidp ret;
ret = NULL;
}
- num_blocks = (int)(1 << (png_ptr->zlib_window_bits - 14));
- if (num_blocks < 1)
+ if(png_ptr->zlib_window_bits > 14)
+ num_blocks = (int)(1 << (png_ptr->zlib_window_bits - 14));
+ else
num_blocks = 1;
if (png_ptr->zlib_mem_level >= 7)
num_blocks += (int)(1 << (png_ptr->zlib_mem_level - 7));
if (table == NULL)
{
- png_error(png_ptr, "Out Of Memory."); /* Note "O" and "M" */
+ if (png_ptr->flags&PNG_FLAG_MALLOC_NULL_MEM_OK) == 0)
+ png_error(png_ptr, "Out Of Memory."); /* Note "O" and "M" */
+ else
+ png_warning(png_ptr, "Out Of Memory.");
+ return (NULL);
}
if ((png_size_t)table & 0xfff0)
{
- png_error(png_ptr, "Farmalloc didn't return normalized pointer");
+ if (png_ptr->flags&PNG_FLAG_MALLOC_NULL_MEM_OK) == 0)
+ png_error(png_ptr,
+ "Farmalloc didn't return normalized pointer");
+ else
+ png_warning(png_ptr,
+ "Farmalloc didn't return normalized pointer");
+ return (NULL);
}
png_ptr->offset_table = table;
if (png_ptr->offset_table_ptr == NULL)
{
- png_error(png_ptr, "Out Of memory.");
+ if (png_ptr->flags&PNG_FLAG_MALLOC_NULL_MEM_OK) == 0)
+ png_error(png_ptr, "Out Of memory."); /* Note "O" and "M" */
+ else
+ png_warning(png_ptr, "Out Of memory.");
+ return (NULL);
}
hptr = (png_byte huge *)table;
if ((png_size_t)hptr & 0xf)
{
hptr = (png_byte huge *)((long)(hptr) & 0xfffffff0L);
- hptr += 16L;
+ hptr = hptr + 16L; /* "hptr += 16L" fails on Turbo C++ 3.0 */
}
for (i = 0; i < num_blocks; i++)
{
png_ptr->offset_table_ptr[i] = (png_bytep)hptr;
- hptr += (png_uint_32)65536L;
+ hptr = hptr + (png_uint_32)65536L; /* "+=" fails on TC++3.0 */
}
png_ptr->offset_table_number = num_blocks;
}
if (png_ptr->offset_table_count >= png_ptr->offset_table_number)
- png_error(png_ptr, "Out of Memory.");
+ {
+ if (png_ptr->flags&PNG_FLAG_MALLOC_NULL_MEM_OK) == 0)
+ png_error(png_ptr, "Out of Memory."); /* Note "o" and "M" */
+ else
+ png_warning(png_ptr, "Out of Memory.");
+ return (NULL);
+ }
ret = png_ptr->offset_table_ptr[png_ptr->offset_table_count++];
}
if (ret == NULL)
{
- png_error(png_ptr, "Out of memory."); /* Note "o" and "m" */
+ if (png_ptr->flags&PNG_FLAG_MALLOC_NULL_MEM_OK) == 0)
+ png_error(png_ptr, "Out of memory."); /* Note "o" and "m" */
+ else
+ png_warning(png_ptr, "Out of memory."); /* Note "o" and "m" */
}
return (ret);
/* free a pointer allocated by png_malloc(). In the default
configuration, png_ptr is not used, but is passed in case it
is needed. If ptr is NULL, return without taking any action. */
-void
+void PNGAPI
png_free(png_structp png_ptr, png_voidp ptr)
{
if (png_ptr == NULL || ptr == NULL)
if (png_ptr->free_fn != NULL)
{
(*(png_ptr->free_fn))(png_ptr, ptr);
- ptr = NULL;
return;
}
else png_free_default(png_ptr, ptr);
}
-void
+void PNGAPI
png_free_default(png_structp png_ptr, png_voidp ptr)
{
#endif /* PNG_USER_MEM_SUPPORTED */
if (ptr != NULL)
{
farfree(ptr);
- ptr = NULL;
}
}
/* Allocate memory for a png_struct or a png_info. The malloc and
memset can be replaced by a single call to calloc() if this is thought
- to improve performance noticably.*/
-png_voidp
+ to improve performance noticably. */
+png_voidp /* PRIVATE */
png_create_struct(int type)
{
#ifdef PNG_USER_MEM_SUPPORTED
- return (png_create_struct_2(type, NULL));
+ return (png_create_struct_2(type, png_malloc_ptr_NULL, png_voidp_NULL));
}
/* Allocate memory for a png_struct or a png_info. The malloc and
memset can be replaced by a single call to calloc() if this is thought
- to improve performance noticably.*/
-png_voidp
-png_create_struct_2(int type, png_malloc_ptr malloc_fn)
+ to improve performance noticably. */
+png_voidp /* PRIVATE */
+png_create_struct_2(int type, png_malloc_ptr malloc_fn, png_voidp mem_ptr)
{
#endif /* PNG_USER_MEM_SUPPORTED */
png_size_t size;
else if (type == PNG_STRUCT_PNG)
size = sizeof(png_struct);
else
- return ((png_voidp)NULL);
+ return (NULL);
#ifdef PNG_USER_MEM_SUPPORTED
if(malloc_fn != NULL)
{
- if ((struct_ptr = (*(malloc_fn))(NULL, size)) != NULL)
+ png_struct dummy_struct;
+ png_structp png_ptr = &dummy_struct;
+ png_ptr->mem_ptr=mem_ptr;
+ struct_ptr = (*(malloc_fn))(png_ptr, size);
+ if (struct_ptr != NULL)
png_memset(struct_ptr, 0, size);
return (struct_ptr);
}
/* Free memory allocated by a png_create_struct() call */
-void
+void /* PRIVATE */
png_destroy_struct(png_voidp struct_ptr)
{
#ifdef PNG_USER_MEM_SUPPORTED
- png_destroy_struct_2(struct_ptr, (png_free_ptr)NULL);
+ png_destroy_struct_2(struct_ptr, png_free_ptr_NULL, png_voidp_NULL);
}
/* Free memory allocated by a png_create_struct() call */
-void
-png_destroy_struct_2(png_voidp struct_ptr, png_free_ptr free_fn)
+void /* PRIVATE */
+png_destroy_struct_2(png_voidp struct_ptr, png_free_ptr free_fn,
+ png_voidp mem_ptr)
{
#endif /* PNG_USER_MEM_SUPPORTED */
if (struct_ptr != NULL)
{
png_struct dummy_struct;
png_structp png_ptr = &dummy_struct;
+ png_ptr->mem_ptr=mem_ptr;
(*(free_fn))(png_ptr, struct_ptr);
- struct_ptr = NULL;
return;
}
#endif /* PNG_USER_MEM_SUPPORTED */
#if defined(__TURBOC__) && !defined(__FLAT__)
farfree(struct_ptr);
- struct_ptr = NULL;
#else
# if defined(_MSC_VER) && defined(MAXSEG_64K)
hfree(struct_ptr);
- struct_ptr = NULL;
# else
free(struct_ptr);
- struct_ptr = NULL;
# endif
#endif
}
}
-
/* Allocate memory. For reasonable files, size should never exceed
64K. However, zlib may allocate more then 64K if you don't tell
it not to. See zconf.h and png.h for more information. zlib does
need to allocate exactly 64K, so whatever you call here must
have the ability to do that. */
-png_voidp
+png_voidp PNGAPI
png_malloc(png_structp png_ptr, png_uint_32 size)
{
-#ifndef PNG_USER_MEM_SUPPORTED
png_voidp ret;
-#endif
+
if (png_ptr == NULL || size == 0)
- return ((png_voidp)NULL);
+ return (NULL);
#ifdef PNG_USER_MEM_SUPPORTED
if(png_ptr->malloc_fn != NULL)
- return ((png_voidp)(*(png_ptr->malloc_fn))(png_ptr, size));
+ {
+ ret = ((png_voidp)(*(png_ptr->malloc_fn))(png_ptr, (png_size_t)size));
+ if (ret == NULL && (png_ptr->flags&PNG_FLAG_MALLOC_NULL_MEM_OK) == 0)
+ png_error(png_ptr, "Out of Memory!");
+ return (ret);
+ }
else
return (png_malloc_default(png_ptr, size));
}
-png_voidp
+
+png_voidp PNGAPI
png_malloc_default(png_structp png_ptr, png_uint_32 size)
{
png_voidp ret;
#ifdef PNG_MAX_MALLOC_64K
if (size > (png_uint_32)65536L)
- png_error(png_ptr, "Cannot Allocate > 64K");
+ {
+ if(png_ptr->flags&PNG_FLAG_MALLOC_NULL_MEM_OK) == 0)
+ png_error(png_ptr, "Cannot Allocate > 64K");
+ else
+ return NULL;
+ }
#endif
#if defined(__TURBOC__) && !defined(__FLAT__)
# endif
#endif
- if (ret == NULL)
- {
+ if (ret == NULL && (png_ptr->flags&PNG_FLAG_MALLOC_NULL_MEM_OK) == 0)
png_error(png_ptr, "Out of Memory");
- }
return (ret);
}
/* Free a pointer allocated by png_malloc(). If ptr is NULL, return
without taking any action. */
-void
+void PNGAPI
png_free(png_structp png_ptr, png_voidp ptr)
{
if (png_ptr == NULL || ptr == NULL)
if (png_ptr->free_fn != NULL)
{
(*(png_ptr->free_fn))(png_ptr, ptr);
- ptr = NULL;
return;
}
else png_free_default(png_ptr, ptr);
}
-void
+void PNGAPI
png_free_default(png_structp png_ptr, png_voidp ptr)
{
+ if (png_ptr == NULL || ptr == NULL)
+ return;
+
#endif /* PNG_USER_MEM_SUPPORTED */
#if defined(__TURBOC__) && !defined(__FLAT__)
farfree(ptr);
- ptr = NULL;
#else
# if defined(_MSC_VER) && defined(MAXSEG_64K)
hfree(ptr);
- ptr = NULL;
# else
free(ptr);
- ptr = NULL;
# endif
#endif
}
#endif /* Not Borland DOS special memory handler */
-png_voidp
+#if defined(PNG_1_0_X)
+# define png_malloc_warn png_malloc
+#else
+/* This function was added at libpng version 1.2.3. The png_malloc_warn()
+ * function will issue a png_warning and return NULL instead of issuing a
+ * png_error, if it fails to allocate the requested memory.
+ */
+png_voidp PNGAPI
+png_malloc_warn(png_structp png_ptr, png_uint_32 size)
+{
+ png_voidp ptr;
+ png_uint_32 save_flags=png_ptr->flags;
+
+ png_ptr->flags|=PNG_FLAG_MALLOC_NULL_MEM_OK;
+ ptr = (png_voidp)png_malloc((png_structp)png_ptr, size);
+ png_ptr->flags=save_flags;
+ return(ptr);
+}
+#endif
+
+png_voidp PNGAPI
png_memcpy_check (png_structp png_ptr, png_voidp s1, png_voidp s2,
png_uint_32 length)
{
return(png_memcpy (s1, s2, size));
}
-png_voidp
+png_voidp PNGAPI
png_memset_check (png_structp png_ptr, png_voidp s1, int value,
png_uint_32 length)
{
/* This function is called when the application wants to use another method
* of allocating and freeing memory.
*/
-void
+void PNGAPI
png_set_mem_fn(png_structp png_ptr, png_voidp mem_ptr, png_malloc_ptr
malloc_fn, png_free_ptr free_fn)
{
* functions. The application should free any memory associated with this
* pointer before png_write_destroy and png_read_destroy are called.
*/
-png_voidp
+png_voidp PNGAPI
png_get_mem_ptr(png_structp png_ptr)
{
return ((png_voidp)png_ptr->mem_ptr);
/* pngpread.c - read a png file in push mode
*
- * libpng 1.0.3 - January 14, 1999
+ * libpng 1.2.4 - July 8, 2002
* For conditions of distribution and use, see copyright notice in png.h
- * Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.
- * Copyright (c) 1996, 1997 Andreas Dilger
- * Copyright (c) 1998, 1999 Glenn Randers-Pehrson
+ * Copyright (c) 1998-2002 Glenn Randers-Pehrson
+ * (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger)
+ * (Version 0.88 Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.)
*/
#define PNG_INTERNAL
#ifdef PNG_PROGRESSIVE_READ_SUPPORTED
-void
+/* push model modes */
+#define PNG_READ_SIG_MODE 0
+#define PNG_READ_CHUNK_MODE 1
+#define PNG_READ_IDAT_MODE 2
+#define PNG_SKIP_MODE 3
+#define PNG_READ_tEXt_MODE 4
+#define PNG_READ_zTXt_MODE 5
+#define PNG_READ_DONE_MODE 6
+#define PNG_READ_iTXt_MODE 7
+#define PNG_ERROR_MODE 8
+
+void PNGAPI
png_process_data(png_structp png_ptr, png_infop info_ptr,
png_bytep buffer, png_size_t buffer_size)
{
/* What we do with the incoming data depends on what we were previously
* doing before we ran out of data...
*/
-void
+void /* PRIVATE */
png_process_some_data(png_structp png_ptr, png_infop info_ptr)
{
switch (png_ptr->process_mode)
png_push_read_zTXt(png_ptr, info_ptr);
break;
}
+#endif
+#if defined(PNG_READ_iTXt_SUPPORTED)
+ case PNG_READ_iTXt_MODE:
+ {
+ png_push_read_iTXt(png_ptr, info_ptr);
+ break;
+ }
#endif
case PNG_SKIP_MODE:
{
* checked by the calling application, or because of multiple calls to this
* routine.
*/
-void
+void /* PRIVATE */
png_push_read_sig(png_structp png_ptr, png_infop info_ptr)
{
png_size_t num_checked = png_ptr->sig_bytes,
png_push_fill_buffer(png_ptr, &(info_ptr->signature[num_checked]),
num_to_check);
- png_ptr->sig_bytes += num_to_check;
+ png_ptr->sig_bytes = (png_byte)(png_ptr->sig_bytes+num_to_check);
if (png_sig_cmp(info_ptr->signature, num_checked, num_to_check))
{
}
}
-void
+void /* PRIVATE */
png_push_read_chunk(png_structp png_ptr, png_infop info_ptr)
{
+#ifdef PNG_USE_LOCAL_ARRAYS
+ PNG_IHDR;
+ PNG_IDAT;
+ PNG_IEND;
+ PNG_PLTE;
+#if defined(PNG_READ_bKGD_SUPPORTED)
+ PNG_bKGD;
+#endif
+#if defined(PNG_READ_cHRM_SUPPORTED)
+ PNG_cHRM;
+#endif
+#if defined(PNG_READ_gAMA_SUPPORTED)
+ PNG_gAMA;
+#endif
+#if defined(PNG_READ_hIST_SUPPORTED)
+ PNG_hIST;
+#endif
+#if defined(PNG_READ_iCCP_SUPPORTED)
+ PNG_iCCP;
+#endif
+#if defined(PNG_READ_iTXt_SUPPORTED)
+ PNG_iTXt;
+#endif
+#if defined(PNG_READ_oFFs_SUPPORTED)
+ PNG_oFFs;
+#endif
+#if defined(PNG_READ_pCAL_SUPPORTED)
+ PNG_pCAL;
+#endif
+#if defined(PNG_READ_pHYs_SUPPORTED)
+ PNG_pHYs;
+#endif
+#if defined(PNG_READ_sBIT_SUPPORTED)
+ PNG_sBIT;
+#endif
+#if defined(PNG_READ_sCAL_SUPPORTED)
+ PNG_sCAL;
+#endif
+#if defined(PNG_READ_sRGB_SUPPORTED)
+ PNG_sRGB;
+#endif
+#if defined(PNG_READ_sPLT_SUPPORTED)
+ PNG_sPLT;
+#endif
+#if defined(PNG_READ_tEXt_SUPPORTED)
+ PNG_tEXt;
+#endif
+#if defined(PNG_READ_tIME_SUPPORTED)
+ PNG_tIME;
+#endif
+#if defined(PNG_READ_tRNS_SUPPORTED)
+ PNG_tRNS;
+#endif
+#if defined(PNG_READ_zTXt_SUPPORTED)
+ PNG_zTXt;
+#endif
+#endif /* PNG_USE_LOCAL_ARRAYS */
/* First we make sure we have enough data for the 4 byte chunk name
* and the 4 byte chunk length before proceeding with decoding the
* chunk data. To fully decode each of these chunks, we also make
* sure we have enough data in the buffer for the 4 byte CRC at the
* end of every chunk (except IDAT, which is handled separately).
*/
- if (!(png_ptr->flags & PNG_FLAG_HAVE_CHUNK_HEADER))
+ if (!(png_ptr->mode & PNG_HAVE_CHUNK_HEADER))
{
png_byte chunk_length[4];
png_ptr->push_length = png_get_uint_32(chunk_length);
png_reset_crc(png_ptr);
png_crc_read(png_ptr, png_ptr->chunk_name, 4);
- png_ptr->flags |= PNG_FLAG_HAVE_CHUNK_HEADER;
+ png_ptr->mode |= PNG_HAVE_CHUNK_HEADER;
}
if (!png_memcmp(png_ptr->chunk_name, png_IHDR, 4))
png_push_save_buffer(png_ptr);
return;
}
-
png_handle_IHDR(png_ptr, info_ptr, png_ptr->push_length);
}
else if (!png_memcmp(png_ptr->chunk_name, png_PLTE, 4))
png_push_save_buffer(png_ptr);
return;
}
-
png_handle_PLTE(png_ptr, info_ptr, png_ptr->push_length);
}
- else if (!png_memcmp(png_ptr->chunk_name, png_IDAT, 4))
+ else if (!png_memcmp(png_ptr->chunk_name, (png_bytep)png_IDAT, 4))
{
/* If we reach an IDAT chunk, this means we have read all of the
* header chunks, and we can start reading the image (or if this
* is called after the image has been read - we have an error).
*/
+ if (!(png_ptr->mode & PNG_HAVE_IHDR))
+ png_error(png_ptr, "Missing IHDR before IDAT");
+ else if (png_ptr->color_type == PNG_COLOR_TYPE_PALETTE &&
+ !(png_ptr->mode & PNG_HAVE_PLTE))
+ png_error(png_ptr, "Missing PLTE before IDAT");
+
if (png_ptr->mode & PNG_HAVE_IDAT)
{
if (png_ptr->push_length == 0)
png_push_save_buffer(png_ptr);
return;
}
-
png_handle_IEND(png_ptr, info_ptr, png_ptr->push_length);
+
png_ptr->process_mode = PNG_READ_DONE_MODE;
png_push_have_end(png_ptr, info_ptr);
}
png_push_save_buffer(png_ptr);
return;
}
-
png_handle_gAMA(png_ptr, info_ptr, png_ptr->push_length);
}
#endif
png_push_save_buffer(png_ptr);
return;
}
-
png_handle_sBIT(png_ptr, info_ptr, png_ptr->push_length);
}
#endif
png_push_save_buffer(png_ptr);
return;
}
-
png_handle_cHRM(png_ptr, info_ptr, png_ptr->push_length);
}
#endif
png_push_save_buffer(png_ptr);
return;
}
-
png_handle_sRGB(png_ptr, info_ptr, png_ptr->push_length);
}
#endif
+#if defined(PNG_READ_iCCP_SUPPORTED)
+ else if (!png_memcmp(png_ptr->chunk_name, png_iCCP, 4))
+ {
+ if (png_ptr->push_length + 4 > png_ptr->buffer_size)
+ {
+ png_push_save_buffer(png_ptr);
+ return;
+ }
+ png_handle_iCCP(png_ptr, info_ptr, png_ptr->push_length);
+ }
+#endif
+#if defined(PNG_READ_sPLT_SUPPORTED)
+ else if (!png_memcmp(png_ptr->chunk_name, png_sPLT, 4))
+ {
+ if (png_ptr->push_length + 4 > png_ptr->buffer_size)
+ {
+ png_push_save_buffer(png_ptr);
+ return;
+ }
+ png_handle_sPLT(png_ptr, info_ptr, png_ptr->push_length);
+ }
+#endif
#if defined(PNG_READ_tRNS_SUPPORTED)
else if (!png_memcmp(png_ptr->chunk_name, png_tRNS, 4))
{
png_push_save_buffer(png_ptr);
return;
}
-
png_handle_tRNS(png_ptr, info_ptr, png_ptr->push_length);
}
#endif
png_push_save_buffer(png_ptr);
return;
}
-
png_handle_bKGD(png_ptr, info_ptr, png_ptr->push_length);
}
#endif
png_push_save_buffer(png_ptr);
return;
}
-
png_handle_hIST(png_ptr, info_ptr, png_ptr->push_length);
}
#endif
png_push_save_buffer(png_ptr);
return;
}
-
png_handle_pHYs(png_ptr, info_ptr, png_ptr->push_length);
}
#endif
png_push_save_buffer(png_ptr);
return;
}
-
png_handle_oFFs(png_ptr, info_ptr, png_ptr->push_length);
}
#endif
png_push_save_buffer(png_ptr);
return;
}
-
png_handle_pCAL(png_ptr, info_ptr, png_ptr->push_length);
}
#endif
+#if defined(PNG_READ_sCAL_SUPPORTED)
+ else if (!png_memcmp(png_ptr->chunk_name, png_sCAL, 4))
+ {
+ if (png_ptr->push_length + 4 > png_ptr->buffer_size)
+ {
+ png_push_save_buffer(png_ptr);
+ return;
+ }
+ png_handle_sCAL(png_ptr, info_ptr, png_ptr->push_length);
+ }
+#endif
#if defined(PNG_READ_tIME_SUPPORTED)
else if (!png_memcmp(png_ptr->chunk_name, png_tIME, 4))
{
png_push_save_buffer(png_ptr);
return;
}
-
png_handle_tIME(png_ptr, info_ptr, png_ptr->push_length);
}
#endif
#if defined(PNG_READ_tEXt_SUPPORTED)
else if (!png_memcmp(png_ptr->chunk_name, png_tEXt, 4))
{
+ if (png_ptr->push_length + 4 > png_ptr->buffer_size)
+ {
+ png_push_save_buffer(png_ptr);
+ return;
+ }
png_push_handle_tEXt(png_ptr, info_ptr, png_ptr->push_length);
}
#endif
#if defined(PNG_READ_zTXt_SUPPORTED)
else if (!png_memcmp(png_ptr->chunk_name, png_zTXt, 4))
{
+ if (png_ptr->push_length + 4 > png_ptr->buffer_size)
+ {
+ png_push_save_buffer(png_ptr);
+ return;
+ }
png_push_handle_zTXt(png_ptr, info_ptr, png_ptr->push_length);
}
+#endif
+#if defined(PNG_READ_iTXt_SUPPORTED)
+ else if (!png_memcmp(png_ptr->chunk_name, png_iTXt, 4))
+ {
+ if (png_ptr->push_length + 4 > png_ptr->buffer_size)
+ {
+ png_push_save_buffer(png_ptr);
+ return;
+ }
+ png_push_handle_iTXt(png_ptr, info_ptr, png_ptr->push_length);
+ }
#endif
else
{
+ if (png_ptr->push_length + 4 > png_ptr->buffer_size)
+ {
+ png_push_save_buffer(png_ptr);
+ return;
+ }
png_push_handle_unknown(png_ptr, info_ptr, png_ptr->push_length);
}
- png_ptr->flags &= ~PNG_FLAG_HAVE_CHUNK_HEADER;
+ png_ptr->mode &= ~PNG_HAVE_CHUNK_HEADER;
}
-void
+void /* PRIVATE */
png_push_crc_skip(png_structp png_ptr, png_uint_32 skip)
{
png_ptr->process_mode = PNG_SKIP_MODE;
png_ptr->skip_length = skip;
}
-void
+void /* PRIVATE */
png_push_crc_finish(png_structp png_ptr)
{
if (png_ptr->skip_length && png_ptr->save_buffer_size)
}
}
-void
+void PNGAPI
png_push_fill_buffer(png_structp png_ptr, png_bytep buffer, png_size_t length)
{
png_bytep ptr;
}
}
-void
+void /* PRIVATE */
png_push_save_buffer(png_structp png_ptr)
{
if (png_ptr->save_buffer_size)
png_ptr->buffer_size = 0;
}
-void
+void /* PRIVATE */
png_push_restore_buffer(png_structp png_ptr, png_bytep buffer,
png_size_t buffer_length)
{
png_ptr->current_buffer_ptr = png_ptr->current_buffer;
}
-void
+void /* PRIVATE */
png_push_read_IDAT(png_structp png_ptr)
{
- if (!(png_ptr->flags & PNG_FLAG_HAVE_CHUNK_HEADER))
+#ifdef PNG_USE_LOCAL_ARRAYS
+ PNG_IDAT;
+#endif
+ if (!(png_ptr->mode & PNG_HAVE_CHUNK_HEADER))
{
png_byte chunk_length[4];
png_reset_crc(png_ptr);
png_crc_read(png_ptr, png_ptr->chunk_name, 4);
- png_ptr->flags |= PNG_FLAG_HAVE_CHUNK_HEADER;
+ png_ptr->mode |= PNG_HAVE_CHUNK_HEADER;
- if (png_memcmp(png_ptr->chunk_name, png_IDAT, 4))
+ if (png_memcmp(png_ptr->chunk_name, (png_bytep)png_IDAT, 4))
{
png_ptr->process_mode = PNG_READ_CHUNK_MODE;
if (!(png_ptr->flags & PNG_FLAG_ZLIB_FINISHED))
}
png_crc_finish(png_ptr, 0);
- png_ptr->flags &= ~PNG_FLAG_HAVE_CHUNK_HEADER;
+ png_ptr->mode &= ~PNG_HAVE_CHUNK_HEADER;
}
}
-void
+void /* PRIVATE */
png_process_IDAT_data(png_structp png_ptr, png_bytep buffer,
png_size_t buffer_length)
{
for(;;)
{
ret = inflate(&png_ptr->zstream, Z_PARTIAL_FLUSH);
- if (ret == Z_STREAM_END)
+ if (ret != Z_OK)
{
- if (png_ptr->zstream.avail_in)
- png_error(png_ptr, "Extra compressed data");
- if (!(png_ptr->zstream.avail_out))
+ if (ret == Z_STREAM_END)
{
- png_push_process_row(png_ptr);
- }
+ if (png_ptr->zstream.avail_in)
+ png_error(png_ptr, "Extra compressed data");
+ if (!(png_ptr->zstream.avail_out))
+ {
+ png_push_process_row(png_ptr);
+ }
- png_ptr->mode |= PNG_AFTER_IDAT;
- png_ptr->flags |= PNG_FLAG_ZLIB_FINISHED;
- break;
+ png_ptr->mode |= PNG_AFTER_IDAT;
+ png_ptr->flags |= PNG_FLAG_ZLIB_FINISHED;
+ break;
+ }
+ else if (ret == Z_BUF_ERROR)
+ break;
+ else
+ png_error(png_ptr, "Decompression Error");
}
- else if (ret == Z_BUF_ERROR)
- break;
- else if (ret != Z_OK)
- png_error(png_ptr, "Decompression Error");
if (!(png_ptr->zstream.avail_out))
{
+ if ((
+#if defined(PNG_READ_INTERLACING_SUPPORTED)
+ png_ptr->interlaced && png_ptr->pass > 6) ||
+ (!png_ptr->interlaced &&
+#endif
+ png_ptr->row_number == png_ptr->num_rows-1))
+ png_error(png_ptr, "Too much data in IDAT chunks");
png_push_process_row(png_ptr);
png_ptr->zstream.avail_out = (uInt)png_ptr->irowbytes;
png_ptr->zstream.next_out = png_ptr->row_buf;
}
}
-void
+void /* PRIVATE */
png_push_process_row(png_structp png_ptr)
{
png_ptr->row_info.color_type = png_ptr->color_type;
if (png_ptr->interlaced && (png_ptr->transformations & PNG_INTERLACE))
{
if (png_ptr->pass < 6)
+/* old interface (pre-1.0.9):
png_do_read_interlace(&(png_ptr->row_info),
png_ptr->row_buf + 1, png_ptr->pass, png_ptr->transformations);
+ */
+ png_do_read_interlace(png_ptr);
- switch (png_ptr->pass)
- {
+ switch (png_ptr->pass)
+ {
case 0:
{
int i;
for (i = 0; i < 8 && png_ptr->pass == 0; i++)
{
png_push_have_row(png_ptr, png_ptr->row_buf + 1);
- png_read_push_finish_row(png_ptr);
+ png_read_push_finish_row(png_ptr); /* updates png_ptr->pass */
+ }
+ if (png_ptr->pass == 2) /* pass 1 might be empty */
+ {
+ for (i = 0; i < 4 && png_ptr->pass == 2; i++)
+ {
+ png_push_have_row(png_ptr, png_bytep_NULL);
+ png_read_push_finish_row(png_ptr);
+ }
+ }
+ if (png_ptr->pass == 4 && png_ptr->height <= 4)
+ {
+ for (i = 0; i < 2 && png_ptr->pass == 4; i++)
+ {
+ png_push_have_row(png_ptr, png_bytep_NULL);
+ png_read_push_finish_row(png_ptr);
+ }
+ }
+ if (png_ptr->pass == 6 && png_ptr->height <= 4)
+ {
+ png_push_have_row(png_ptr, png_bytep_NULL);
+ png_read_push_finish_row(png_ptr);
}
break;
}
png_push_have_row(png_ptr, png_ptr->row_buf + 1);
png_read_push_finish_row(png_ptr);
}
- if (png_ptr->pass == 2)
+ if (png_ptr->pass == 2) /* skip top 4 generated rows */
{
for (i = 0; i < 4 && png_ptr->pass == 2; i++)
{
- png_push_have_row(png_ptr, NULL);
+ png_push_have_row(png_ptr, png_bytep_NULL);
png_read_push_finish_row(png_ptr);
}
}
}
for (i = 0; i < 4 && png_ptr->pass == 2; i++)
{
- png_push_have_row(png_ptr, NULL);
+ png_push_have_row(png_ptr, png_bytep_NULL);
png_read_push_finish_row(png_ptr);
}
+ if (png_ptr->pass == 4) /* pass 3 might be empty */
+ {
+ for (i = 0; i < 2 && png_ptr->pass == 4; i++)
+ {
+ png_push_have_row(png_ptr, png_bytep_NULL);
+ png_read_push_finish_row(png_ptr);
+ }
+ }
break;
}
case 3:
png_push_have_row(png_ptr, png_ptr->row_buf + 1);
png_read_push_finish_row(png_ptr);
}
- if (png_ptr->pass == 4)
+ if (png_ptr->pass == 4) /* skip top two generated rows */
{
for (i = 0; i < 2 && png_ptr->pass == 4; i++)
{
- png_push_have_row(png_ptr, NULL);
+ png_push_have_row(png_ptr, png_bytep_NULL);
png_read_push_finish_row(png_ptr);
}
}
}
for (i = 0; i < 2 && png_ptr->pass == 4; i++)
{
- png_push_have_row(png_ptr, NULL);
+ png_push_have_row(png_ptr, png_bytep_NULL);
+ png_read_push_finish_row(png_ptr);
+ }
+ if (png_ptr->pass == 6) /* pass 5 might be empty */
+ {
+ png_push_have_row(png_ptr, png_bytep_NULL);
png_read_push_finish_row(png_ptr);
}
break;
png_push_have_row(png_ptr, png_ptr->row_buf + 1);
png_read_push_finish_row(png_ptr);
}
- if (png_ptr->pass == 6)
+ if (png_ptr->pass == 6) /* skip top generated row */
{
- png_push_have_row(png_ptr, NULL);
+ png_push_have_row(png_ptr, png_bytep_NULL);
png_read_push_finish_row(png_ptr);
}
break;
png_read_push_finish_row(png_ptr);
if (png_ptr->pass != 6)
break;
- png_push_have_row(png_ptr, NULL);
+ png_push_have_row(png_ptr, png_bytep_NULL);
png_read_push_finish_row(png_ptr);
}
}
}
}
-void
+void /* PRIVATE */
png_read_push_finish_row(png_structp png_ptr)
{
+#ifdef PNG_USE_LOCAL_ARRAYS
+ /* arrays to facilitate easy interlacing - use pass (0 - 6) as index */
+
+ /* start of interlace block */
+ const int FARDATA png_pass_start[] = {0, 4, 0, 2, 0, 1, 0};
+
+ /* offset to next interlace block */
+ const int FARDATA png_pass_inc[] = {8, 8, 4, 4, 2, 2, 1};
+
+ /* start of interlace block in the y direction */
+ const int FARDATA png_pass_ystart[] = {0, 0, 4, 0, 2, 0, 1};
+
+ /* offset to next interlace block in the y direction */
+ const int FARDATA png_pass_yinc[] = {8, 8, 8, 4, 4, 2, 2};
+
+ /* Width of interlace block. This is not currently used - if you need
+ * it, uncomment it here and in png.h
+ const int FARDATA png_pass_width[] = {8, 4, 4, 2, 2, 1, 1};
+ */
+
+ /* Height of interlace block. This is not currently used - if you need
+ * it, uncomment it here and in png.h
+ const int FARDATA png_pass_height[] = {8, 8, 4, 4, 2, 2, 1};
+ */
+#endif
+
png_ptr->row_number++;
if (png_ptr->row_number < png_ptr->num_rows)
return;
do
{
png_ptr->pass++;
+ if ((png_ptr->pass == 1 && png_ptr->width < 5) ||
+ (png_ptr->pass == 3 && png_ptr->width < 3) ||
+ (png_ptr->pass == 5 && png_ptr->width < 2))
+ png_ptr->pass++;
+
if (png_ptr->pass >= 7)
break;
}
#if defined(PNG_READ_tEXt_SUPPORTED)
-void
-png_push_handle_tEXt(png_structp png_ptr, png_infop info_ptr, png_uint_32 length)
+void /* PRIVATE */
+png_push_handle_tEXt(png_structp png_ptr, png_infop info_ptr, png_uint_32
+ length)
{
- if (png_ptr->mode == PNG_BEFORE_IHDR || png_ptr->mode & PNG_HAVE_IEND)
+ if (!(png_ptr->mode & PNG_HAVE_IHDR) || (png_ptr->mode & PNG_HAVE_IEND))
{
png_error(png_ptr, "Out of place tEXt");
/* to quiet some compiler warnings */
#ifdef PNG_MAX_MALLOC_64K
png_ptr->skip_length = 0; /* This may not be necessary */
- if (length > (png_uint_32)65535L) /* Can't hold the entire string in memory */
+ if (length > (png_uint_32)65535L) /* Can't hold entire string in memory */
{
png_warning(png_ptr, "tEXt chunk too large to fit in memory");
png_ptr->skip_length = length - (png_uint_32)65535L;
png_ptr->process_mode = PNG_READ_tEXt_MODE;
}
-void
+void /* PRIVATE */
png_push_read_tEXt(png_structp png_ptr, png_infop info_ptr)
{
if (png_ptr->buffer_size && png_ptr->current_text_left)
png_textp text_ptr;
png_charp text;
png_charp key;
+ int ret;
if (png_ptr->buffer_size < 4)
{
#endif
key = png_ptr->current_text;
- png_ptr->current_text = 0;
for (text = key; *text; text++)
/* empty loop */ ;
text_ptr = (png_textp)png_malloc(png_ptr, (png_uint_32)sizeof(png_text));
text_ptr->compression = PNG_TEXT_COMPRESSION_NONE;
text_ptr->key = key;
+#ifdef PNG_iTXt_SUPPORTED
+ text_ptr->lang = NULL;
+ text_ptr->lang_key = NULL;
+#endif
text_ptr->text = text;
- png_set_text(png_ptr, info_ptr, text_ptr, 1);
+ ret = png_set_text_2(png_ptr, info_ptr, text_ptr, 1);
+ png_free(png_ptr, key);
png_free(png_ptr, text_ptr);
+ png_ptr->current_text = NULL;
+
+ if (ret)
+ png_warning(png_ptr, "Insufficient memory to store text chunk.");
}
}
#endif
#if defined(PNG_READ_zTXt_SUPPORTED)
-void
-png_push_handle_zTXt(png_structp png_ptr, png_infop info_ptr, png_uint_32 length)
+void /* PRIVATE */
+png_push_handle_zTXt(png_structp png_ptr, png_infop info_ptr, png_uint_32
+ length)
{
- if (png_ptr->mode == PNG_BEFORE_IHDR || png_ptr->mode & PNG_HAVE_IEND)
+ if (!(png_ptr->mode & PNG_HAVE_IHDR) || (png_ptr->mode & PNG_HAVE_IEND))
{
png_error(png_ptr, "Out of place zTXt");
/* to quiet some compiler warnings */
png_ptr->process_mode = PNG_READ_zTXt_MODE;
}
-void
+void /* PRIVATE */
png_push_read_zTXt(png_structp png_ptr, png_infop info_ptr)
{
if (png_ptr->buffer_size && png_ptr->current_text_left)
png_push_crc_finish(png_ptr);
key = png_ptr->current_text;
- png_ptr->current_text = 0;
for (text = key; *text; text++)
/* empty loop */ ;
/* zTXt can't have zero text */
if (text == key + png_ptr->current_text_size)
{
+ png_ptr->current_text = NULL;
png_free(png_ptr, key);
return;
}
if (*text != PNG_TEXT_COMPRESSION_zTXt) /* check compression byte */
{
+ png_ptr->current_text = NULL;
png_free(png_ptr, key);
return;
}
{
inflateReset(&png_ptr->zstream);
png_ptr->zstream.avail_in = 0;
+ png_ptr->current_text = NULL;
png_free(png_ptr, key);
png_free(png_ptr, text);
return;
if (text == NULL)
{
text = (png_charp)png_malloc(png_ptr,
- (png_uint_32)(png_ptr->zbuf_size - png_ptr->zstream.avail_out +
- key_size + 1));
+ (png_uint_32)(png_ptr->zbuf_size - png_ptr->zstream.avail_out
+ + key_size + 1));
png_memcpy(text + key_size, png_ptr->zbuf,
png_ptr->zbuf_size - png_ptr->zstream.avail_out);
png_memcpy(text, key, key_size);
if (ret != Z_STREAM_END)
{
+ png_ptr->current_text = NULL;
png_free(png_ptr, key);
png_free(png_ptr, text);
return;
}
+ png_ptr->current_text = NULL;
png_free(png_ptr, key);
key = text;
text += key_size;
text_ptr = (png_textp)png_malloc(png_ptr, (png_uint_32)sizeof(png_text));
text_ptr->compression = PNG_TEXT_COMPRESSION_zTXt;
text_ptr->key = key;
+#ifdef PNG_iTXt_SUPPORTED
+ text_ptr->lang = NULL;
+ text_ptr->lang_key = NULL;
+#endif
text_ptr->text = text;
- png_set_text(png_ptr, info_ptr, text_ptr, 1);
+ ret = png_set_text_2(png_ptr, info_ptr, text_ptr, 1);
+ png_free(png_ptr, key);
png_free(png_ptr, text_ptr);
+
+ if (ret)
+ png_warning(png_ptr, "Insufficient memory to store text chunk.");
+ }
+}
+#endif
+
+#if defined(PNG_READ_iTXt_SUPPORTED)
+void /* PRIVATE */
+png_push_handle_iTXt(png_structp png_ptr, png_infop info_ptr, png_uint_32
+ length)
+{
+ if (!(png_ptr->mode & PNG_HAVE_IHDR) || (png_ptr->mode & PNG_HAVE_IEND))
+ {
+ png_error(png_ptr, "Out of place iTXt");
+ /* to quiet some compiler warnings */
+ if(info_ptr == NULL) return;
+ }
+
+#ifdef PNG_MAX_MALLOC_64K
+ png_ptr->skip_length = 0; /* This may not be necessary */
+
+ if (length > (png_uint_32)65535L) /* Can't hold entire string in memory */
+ {
+ png_warning(png_ptr, "iTXt chunk too large to fit in memory");
+ png_ptr->skip_length = length - (png_uint_32)65535L;
+ length = (png_uint_32)65535L;
+ }
+#endif
+
+ png_ptr->current_text = (png_charp)png_malloc(png_ptr,
+ (png_uint_32)(length+1));
+ png_ptr->current_text[length] = '\0';
+ png_ptr->current_text_ptr = png_ptr->current_text;
+ png_ptr->current_text_size = (png_size_t)length;
+ png_ptr->current_text_left = (png_size_t)length;
+ png_ptr->process_mode = PNG_READ_iTXt_MODE;
+}
+
+void /* PRIVATE */
+png_push_read_iTXt(png_structp png_ptr, png_infop info_ptr)
+{
+
+ if (png_ptr->buffer_size && png_ptr->current_text_left)
+ {
+ png_size_t text_size;
+
+ if (png_ptr->buffer_size < png_ptr->current_text_left)
+ text_size = png_ptr->buffer_size;
+ else
+ text_size = png_ptr->current_text_left;
+ png_crc_read(png_ptr, (png_bytep)png_ptr->current_text_ptr, text_size);
+ png_ptr->current_text_left -= text_size;
+ png_ptr->current_text_ptr += text_size;
+ }
+ if (!(png_ptr->current_text_left))
+ {
+ png_textp text_ptr;
+ png_charp key;
+ int comp_flag;
+ png_charp lang;
+ png_charp lang_key;
+ png_charp text;
+ int ret;
+
+ if (png_ptr->buffer_size < 4)
+ {
+ png_push_save_buffer(png_ptr);
+ return;
+ }
+
+ png_push_crc_finish(png_ptr);
+
+#if defined(PNG_MAX_MALLOC_64K)
+ if (png_ptr->skip_length)
+ return;
+#endif
+
+ key = png_ptr->current_text;
+
+ for (lang = key; *lang; lang++)
+ /* empty loop */ ;
+
+ if (lang != key + png_ptr->current_text_size)
+ lang++;
+
+ comp_flag = *lang++;
+ lang++; /* skip comp_type, always zero */
+
+ for (lang_key = lang; *lang_key; lang_key++)
+ /* empty loop */ ;
+ lang_key++; /* skip NUL separator */
+
+ for (text = lang_key; *text; text++)
+ /* empty loop */ ;
+
+ if (text != key + png_ptr->current_text_size)
+ text++;
+
+ text_ptr = (png_textp)png_malloc(png_ptr, (png_uint_32)sizeof(png_text));
+ text_ptr->compression = comp_flag + 2;
+ text_ptr->key = key;
+ text_ptr->lang = lang;
+ text_ptr->lang_key = lang_key;
+ text_ptr->text = text;
+ text_ptr->text_length = 0;
+ text_ptr->itxt_length = png_strlen(text);
+
+ ret = png_set_text_2(png_ptr, info_ptr, text_ptr, 1);
+
+ png_ptr->current_text = NULL;
+
+ png_free(png_ptr, text_ptr);
+ if (ret)
+ png_warning(png_ptr, "Insufficient memory to store iTXt chunk.");
}
}
#endif
/* This function is called when we haven't found a handler for this
- * chunk. In the future we will have code here that can handle
- * user-defined callback functions for unknown chunks before they are
- * ignored or cause an error. If there isn't a problem with the
- * chunk itself (ie a bad chunk name or a critical chunk), the chunk
- * is (currently) silently ignored.
+ * chunk. If there isn't a problem with the chunk itself (ie a bad chunk
+ * name or a critical chunk), the chunk is (currently) silently ignored.
*/
-void
-png_push_handle_unknown(png_structp png_ptr, png_infop info_ptr, png_uint_32 length)
+void /* PRIVATE */
+png_push_handle_unknown(png_structp png_ptr, png_infop info_ptr, png_uint_32
+ length)
{
+ png_uint_32 skip=0;
png_check_chunk_name(png_ptr, png_ptr->chunk_name);
if (!(png_ptr->chunk_name[0] & 0x20))
{
- png_chunk_error(png_ptr, "unknown critical chunk");
- /* to quiet some compiler warnings */
- if(info_ptr == NULL) return;
+#if defined(PNG_READ_UNKNOWN_CHUNKS_SUPPORTED)
+ if(png_handle_as_unknown(png_ptr, png_ptr->chunk_name) !=
+ HANDLE_CHUNK_ALWAYS
+#if defined(PNG_READ_USER_CHUNKS_SUPPORTED)
+ && png_ptr->read_user_chunk_fn == NULL
+#endif
+ )
+#endif
+ png_chunk_error(png_ptr, "unknown critical chunk");
+
+ /* to quiet compiler warnings about unused info_ptr */
+ if (info_ptr == NULL)
+ return;
}
- png_push_crc_skip(png_ptr, length);
+#if defined(PNG_READ_UNKNOWN_CHUNKS_SUPPORTED)
+ if (png_ptr->flags & PNG_FLAG_KEEP_UNKNOWN_CHUNKS)
+ {
+ png_unknown_chunk chunk;
+
+#ifdef PNG_MAX_MALLOC_64K
+ if (length > (png_uint_32)65535L)
+ {
+ png_warning(png_ptr, "unknown chunk too large to fit in memory");
+ skip = length - (png_uint_32)65535L;
+ length = (png_uint_32)65535L;
+ }
+#endif
+
+ png_strcpy((png_charp)chunk.name, (png_charp)png_ptr->chunk_name);
+ chunk.data = (png_bytep)png_malloc(png_ptr, length);
+ png_crc_read(png_ptr, chunk.data, length);
+ chunk.size = length;
+#if defined(PNG_READ_USER_CHUNKS_SUPPORTED)
+ if(png_ptr->read_user_chunk_fn != NULL)
+ {
+ /* callback to user unknown chunk handler */
+ if ((*(png_ptr->read_user_chunk_fn)) (png_ptr, &chunk) <= 0)
+ {
+ if (!(png_ptr->chunk_name[0] & 0x20))
+ if(png_handle_as_unknown(png_ptr, png_ptr->chunk_name) !=
+ HANDLE_CHUNK_ALWAYS)
+ png_chunk_error(png_ptr, "unknown critical chunk");
+ }
+ png_set_unknown_chunks(png_ptr, info_ptr, &chunk, 1);
+ }
+ else
+#endif
+ png_set_unknown_chunks(png_ptr, info_ptr, &chunk, 1);
+ png_free(png_ptr, chunk.data);
+ }
+ else
+#endif
+ skip=length;
+ png_push_crc_skip(png_ptr, skip);
}
-void
+void /* PRIVATE */
png_push_have_info(png_structp png_ptr, png_infop info_ptr)
{
if (png_ptr->info_fn != NULL)
(*(png_ptr->info_fn))(png_ptr, info_ptr);
}
-void
+void /* PRIVATE */
png_push_have_end(png_structp png_ptr, png_infop info_ptr)
{
if (png_ptr->end_fn != NULL)
(*(png_ptr->end_fn))(png_ptr, info_ptr);
}
-void
+void /* PRIVATE */
png_push_have_row(png_structp png_ptr, png_bytep row)
{
if (png_ptr->row_fn != NULL)
(int)png_ptr->pass);
}
-void
+void PNGAPI
png_progressive_combine_row (png_structp png_ptr,
png_bytep old_row, png_bytep new_row)
{
+#ifdef PNG_USE_LOCAL_ARRAYS
+ const int FARDATA png_pass_dsp_mask[7] =
+ {0xff, 0x0f, 0xff, 0x33, 0xff, 0x55, 0xff};
+#endif
if (new_row != NULL) /* new_row must == png_ptr->row_buf here. */
png_combine_row(png_ptr, old_row, png_pass_dsp_mask[png_ptr->pass]);
}
-void
+void PNGAPI
png_set_progressive_read_fn(png_structp png_ptr, png_voidp progressive_ptr,
png_progressive_info_ptr info_fn, png_progressive_row_ptr row_fn,
png_progressive_end_ptr end_fn)
png_set_read_fn(png_ptr, progressive_ptr, png_push_fill_buffer);
}
-png_voidp
+png_voidp PNGAPI
png_get_progressive_ptr(png_structp png_ptr)
{
return png_ptr->io_ptr;
}
-
#endif /* PNG_PROGRESSIVE_READ_SUPPORTED */
-
/* pngread.c - read a PNG file
*
- * libpng 1.0.3 - January 14, 1999
+ * libpng 1.2.4 - July 8, 2002
* For conditions of distribution and use, see copyright notice in png.h
- * Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.
- * Copyright (c) 1996, 1997 Andreas Dilger
- * Copyright (c) 1998, 1999 Glenn Randers-Pehrson
+ * Copyright (c) 1998-2002 Glenn Randers-Pehrson
+ * (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger)
+ * (Version 0.88 Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.)
*
* This file contains routines that an application calls directly to
* read a PNG file or stream.
#include "png.h"
/* Create a PNG structure for reading, and allocate any memory needed. */
-png_structp
+png_structp PNGAPI
png_create_read_struct(png_const_charp user_png_ver, png_voidp error_ptr,
png_error_ptr error_fn, png_error_ptr warn_fn)
{
#ifdef PNG_USER_MEM_SUPPORTED
return (png_create_read_struct_2(user_png_ver, error_ptr, error_fn,
- warn_fn, NULL, NULL, NULL));
+ warn_fn, png_voidp_NULL, png_malloc_ptr_NULL, png_free_ptr_NULL));
}
/* Alternate create PNG structure for reading, and allocate any memory needed. */
-png_structp
+png_structp PNGAPI
png_create_read_struct_2(png_const_charp user_png_ver, png_voidp error_ptr,
png_error_ptr error_fn, png_error_ptr warn_fn, png_voidp mem_ptr,
png_malloc_ptr malloc_fn, png_free_ptr free_fn)
#endif /* PNG_USER_MEM_SUPPORTED */
png_structp png_ptr;
+
+#ifdef PNG_SETJMP_SUPPORTED
#ifdef USE_FAR_KEYWORD
jmp_buf jmpbuf;
#endif
+#endif
+
+ int i;
+
png_debug(1, "in png_create_read_struct\n");
#ifdef PNG_USER_MEM_SUPPORTED
- if ((png_ptr = (png_structp)png_create_struct_2(PNG_STRUCT_PNG,
- (png_malloc_ptr)malloc_fn)) == NULL)
+ png_ptr = (png_structp)png_create_struct_2(PNG_STRUCT_PNG,
+ (png_malloc_ptr)malloc_fn, (png_voidp)mem_ptr);
#else
- if ((png_ptr = (png_structp)png_create_struct(PNG_STRUCT_PNG)) == NULL)
+ png_ptr = (png_structp)png_create_struct(PNG_STRUCT_PNG);
#endif
- {
- return (png_structp)NULL;
- }
+ if (png_ptr == NULL)
+ return (NULL);
+
+#if !defined(PNG_1_0_X)
+#ifdef PNG_ASSEMBLER_CODE_SUPPORTED
+ png_init_mmx_flags(png_ptr); /* 1.2.0 addition */
+#endif
+#endif /* PNG_1_0_X */
+
+#ifdef PNG_SETJMP_SUPPORTED
#ifdef USE_FAR_KEYWORD
if (setjmp(jmpbuf))
#else
#endif
{
png_free(png_ptr, png_ptr->zbuf);
- png_destroy_struct(png_ptr);
- return (png_structp)NULL;
+ png_ptr->zbuf=NULL;
+#ifdef PNG_USER_MEM_SUPPORTED
+ png_destroy_struct_2((png_voidp)png_ptr,
+ (png_free_ptr)free_fn, (png_voidp)mem_ptr);
+#else
+ png_destroy_struct((png_voidp)png_ptr);
+#endif
+ return (NULL);
}
#ifdef USE_FAR_KEYWORD
png_memcpy(png_ptr->jmpbuf,jmpbuf,sizeof(jmp_buf));
#endif
+#endif
#ifdef PNG_USER_MEM_SUPPORTED
png_set_mem_fn(png_ptr, mem_ptr, malloc_fn, free_fn);
-#endif /* PNG_USER_MEM_SUPPORTED */
+#endif
png_set_error_fn(png_ptr, error_ptr, error_fn, warn_fn);
- /* Libpng 0.90 and later are binary incompatible with libpng 0.89, so
- * we must recompile any applications that use any older library version.
- * For versions after libpng 1.0, we will be compatible, so we need
- * only check the first digit.
- */
- if (user_png_ver == NULL || user_png_ver[0] != png_libpng_ver[0] ||
- (user_png_ver[0] == '0' && user_png_ver[2] < '9'))
+ i=0;
+ do
{
- png_error(png_ptr,
- "Incompatible libpng version in application and library");
+ if(user_png_ver[i] != png_libpng_ver[i])
+ png_ptr->flags |= PNG_FLAG_LIBRARY_MISMATCH;
+ } while (png_libpng_ver[i++]);
+
+ if (png_ptr->flags & PNG_FLAG_LIBRARY_MISMATCH)
+ {
+ /* Libpng 0.90 and later are binary incompatible with libpng 0.89, so
+ * we must recompile any applications that use any older library version.
+ * For versions after libpng 1.0, we will be compatible, so we need
+ * only check the first digit.
+ */
+ if (user_png_ver == NULL || user_png_ver[0] != png_libpng_ver[0] ||
+ (user_png_ver[0] == '1' && user_png_ver[2] != png_libpng_ver[2]) ||
+ (user_png_ver[0] == '0' && user_png_ver[2] < '9'))
+ {
+#if !defined(PNG_NO_STDIO) && !defined(_WIN32_WCE)
+ char msg[80];
+ if (user_png_ver)
+ {
+ sprintf(msg, "Application was compiled with png.h from libpng-%.20s",
+ user_png_ver);
+ png_warning(png_ptr, msg);
+ }
+ sprintf(msg, "Application is running with png.c from libpng-%.20s",
+ png_libpng_ver);
+ png_warning(png_ptr, msg);
+#endif
+#ifdef PNG_ERROR_NUMBERS_SUPPORTED
+ png_ptr->flags=0;
+#endif
+ png_error(png_ptr,
+ "Incompatible libpng version in application and library");
+ }
}
/* initialize zbuf - compression buffer */
png_ptr->zstream.next_out = png_ptr->zbuf;
png_ptr->zstream.avail_out = (uInt)png_ptr->zbuf_size;
- png_set_read_fn(png_ptr, NULL, NULL);
+ png_set_read_fn(png_ptr, png_voidp_NULL, png_rw_ptr_NULL);
+#ifdef PNG_SETJMP_SUPPORTED
+/* Applications that neglect to set up their own setjmp() and then encounter
+ a png_error() will longjmp here. Since the jmpbuf is then meaningless we
+ abort instead of returning. */
+#ifdef USE_FAR_KEYWORD
+ if (setjmp(jmpbuf))
+ PNG_ABORT();
+ png_memcpy(png_ptr->jmpbuf,jmpbuf,sizeof(jmp_buf));
+#else
+ if (setjmp(png_ptr->jmpbuf))
+ PNG_ABORT();
+#endif
+#endif
return (png_ptr);
}
/* Initialize PNG structure for reading, and allocate any memory needed.
This interface is deprecated in favour of the png_create_read_struct(),
and it will eventually disappear. */
-void
+#undef png_read_init
+void PNGAPI
png_read_init(png_structp png_ptr)
{
+ /* We only come here via pre-1.0.7-compiled applications */
+ png_read_init_2(png_ptr, "1.0.6 or earlier", 0, 0);
+}
+
+void PNGAPI
+png_read_init_2(png_structp png_ptr, png_const_charp user_png_ver,
+ png_size_t png_struct_size, png_size_t png_info_size)
+{
+ /* We only come here via pre-1.0.12-compiled applications */
+#if !defined(PNG_NO_STDIO) && !defined(_WIN32_WCE)
+ if(sizeof(png_struct) > png_struct_size || sizeof(png_info) > png_info_size)
+ {
+ char msg[80];
+ png_ptr->warning_fn=NULL;
+ if (user_png_ver)
+ {
+ sprintf(msg, "Application was compiled with png.h from libpng-%.20s",
+ user_png_ver);
+ png_warning(png_ptr, msg);
+ }
+ sprintf(msg, "Application is running with png.c from libpng-%.20s",
+ png_libpng_ver);
+ png_warning(png_ptr, msg);
+ }
+#endif
+ if(sizeof(png_struct) > png_struct_size)
+ {
+ png_ptr->error_fn=NULL;
+#ifdef PNG_ERROR_NUMBERS_SUPPORTED
+ png_ptr->flags=0;
+#endif
+ png_error(png_ptr,
+ "The png struct allocated by the application for reading is too small.");
+ }
+ if(sizeof(png_info) > png_info_size)
+ {
+ png_ptr->error_fn=NULL;
+#ifdef PNG_ERROR_NUMBERS_SUPPORTED
+ png_ptr->flags=0;
+#endif
+ png_error(png_ptr,
+ "The info struct allocated by application for reading is too small.");
+ }
+ png_read_init_3(&png_ptr, user_png_ver, png_struct_size);
+}
+
+void PNGAPI
+png_read_init_3(png_structpp ptr_ptr, png_const_charp user_png_ver,
+ png_size_t png_struct_size)
+{
+#ifdef PNG_SETJMP_SUPPORTED
jmp_buf tmp_jmp; /* to save current jump buffer */
+#endif
+
+ int i=0;
- png_debug(1, "in png_read_init\n");
+ png_structp png_ptr=*ptr_ptr;
+
+ do
+ {
+ if(user_png_ver[i] != png_libpng_ver[i])
+ {
+#ifdef PNG_LEGACY_SUPPORTED
+ png_ptr->flags |= PNG_FLAG_LIBRARY_MISMATCH;
+#else
+ png_ptr->warning_fn=NULL;
+ png_warning(png_ptr,
+ "Application uses deprecated png_read_init() and should be recompiled.");
+ break;
+#endif
+ }
+ } while (png_libpng_ver[i++]);
+
+ png_debug(1, "in png_read_init_3\n");
+
+#ifdef PNG_SETJMP_SUPPORTED
/* save jump buffer and error functions */
png_memcpy(tmp_jmp, png_ptr->jmpbuf, sizeof (jmp_buf));
+#endif
+
+ if(sizeof(png_struct) > png_struct_size)
+ {
+ png_destroy_struct(png_ptr);
+ *ptr_ptr = (png_structp)png_create_struct(PNG_STRUCT_PNG);
+ png_ptr = *ptr_ptr;
+ }
/* reset all variables to 0 */
png_memset(png_ptr, 0, sizeof (png_struct));
+#ifdef PNG_SETJMP_SUPPORTED
/* restore jump buffer */
png_memcpy(png_ptr->jmpbuf, tmp_jmp, sizeof (jmp_buf));
+#endif
/* initialize zbuf - compression buffer */
png_ptr->zbuf_size = PNG_ZBUF_SIZE;
png_ptr->zstream.next_out = png_ptr->zbuf;
png_ptr->zstream.avail_out = (uInt)png_ptr->zbuf_size;
- png_set_read_fn(png_ptr, NULL, NULL);
+ png_set_read_fn(png_ptr, png_voidp_NULL, png_rw_ptr_NULL);
}
/* Read the information before the actual image data. This has been
* here. The application can then have access to the signature bytes we
* read if it is determined that this isn't a valid PNG file.
*/
-void
+void PNGAPI
png_read_info(png_structp png_ptr, png_infop info_ptr)
{
png_debug(1, "in png_read_info\n");
- /* save jump buffer and error functions */
/* If we haven't checked all of the PNG signature bytes, do so now. */
if (png_ptr->sig_bytes < 8)
{
else
png_error(png_ptr, "PNG file corrupted by ASCII conversion");
}
+ if (num_checked < 3)
+ png_ptr->mode |= PNG_HAVE_PNG_SIGNATURE;
}
for(;;)
{
+#ifdef PNG_USE_LOCAL_ARRAYS
+ PNG_IHDR;
+ PNG_IDAT;
+ PNG_IEND;
+ PNG_PLTE;
+#if defined(PNG_READ_bKGD_SUPPORTED)
+ PNG_bKGD;
+#endif
+#if defined(PNG_READ_cHRM_SUPPORTED)
+ PNG_cHRM;
+#endif
+#if defined(PNG_READ_gAMA_SUPPORTED)
+ PNG_gAMA;
+#endif
+#if defined(PNG_READ_hIST_SUPPORTED)
+ PNG_hIST;
+#endif
+#if defined(PNG_READ_iCCP_SUPPORTED)
+ PNG_iCCP;
+#endif
+#if defined(PNG_READ_iTXt_SUPPORTED)
+ PNG_iTXt;
+#endif
+#if defined(PNG_READ_oFFs_SUPPORTED)
+ PNG_oFFs;
+#endif
+#if defined(PNG_READ_pCAL_SUPPORTED)
+ PNG_pCAL;
+#endif
+#if defined(PNG_READ_pHYs_SUPPORTED)
+ PNG_pHYs;
+#endif
+#if defined(PNG_READ_sBIT_SUPPORTED)
+ PNG_sBIT;
+#endif
+#if defined(PNG_READ_sCAL_SUPPORTED)
+ PNG_sCAL;
+#endif
+#if defined(PNG_READ_sPLT_SUPPORTED)
+ PNG_sPLT;
+#endif
+#if defined(PNG_READ_sRGB_SUPPORTED)
+ PNG_sRGB;
+#endif
+#if defined(PNG_READ_tEXt_SUPPORTED)
+ PNG_tEXt;
+#endif
+#if defined(PNG_READ_tIME_SUPPORTED)
+ PNG_tIME;
+#endif
+#if defined(PNG_READ_tRNS_SUPPORTED)
+ PNG_tRNS;
+#endif
+#if defined(PNG_READ_zTXt_SUPPORTED)
+ PNG_zTXt;
+#endif
+#endif /* PNG_GLOBAL_ARRAYS */
png_byte chunk_length[4];
png_uint_32 length;
png_reset_crc(png_ptr);
png_crc_read(png_ptr, png_ptr->chunk_name, 4);
- png_debug1(0, "Reading %s chunk.\n", png_ptr->chunk_name);
+ png_debug2(0, "Reading %s chunk, length=%lu.\n", png_ptr->chunk_name,
+ length);
+
+ if (length > PNG_MAX_UINT)
+ png_error(png_ptr, "Invalid chunk length.");
/* This should be a binary subdivision search or a hash for
* matching the chunk name rather than a linear search.
*/
if (!png_memcmp(png_ptr->chunk_name, png_IHDR, 4))
png_handle_IHDR(png_ptr, info_ptr, length);
- else if (!png_memcmp(png_ptr->chunk_name, png_PLTE, 4))
- png_handle_PLTE(png_ptr, info_ptr, length);
else if (!png_memcmp(png_ptr->chunk_name, png_IEND, 4))
png_handle_IEND(png_ptr, info_ptr, length);
+#ifdef PNG_HANDLE_AS_UNKNOWN_SUPPORTED
+ else if (png_handle_as_unknown(png_ptr, png_ptr->chunk_name))
+ {
+ if (!png_memcmp(png_ptr->chunk_name, png_IDAT, 4))
+ png_ptr->mode |= PNG_HAVE_IDAT;
+ png_handle_unknown(png_ptr, info_ptr, length);
+ if (!png_memcmp(png_ptr->chunk_name, png_PLTE, 4))
+ png_ptr->mode |= PNG_HAVE_PLTE;
+ else if (!png_memcmp(png_ptr->chunk_name, png_IDAT, 4))
+ {
+ if (!(png_ptr->mode & PNG_HAVE_IHDR))
+ png_error(png_ptr, "Missing IHDR before IDAT");
+ else if (png_ptr->color_type == PNG_COLOR_TYPE_PALETTE &&
+ !(png_ptr->mode & PNG_HAVE_PLTE))
+ png_error(png_ptr, "Missing PLTE before IDAT");
+ break;
+ }
+ }
+#endif
+ else if (!png_memcmp(png_ptr->chunk_name, png_PLTE, 4))
+ png_handle_PLTE(png_ptr, info_ptr, length);
else if (!png_memcmp(png_ptr->chunk_name, png_IDAT, 4))
{
if (!(png_ptr->mode & PNG_HAVE_IHDR))
else if (!png_memcmp(png_ptr->chunk_name, png_pCAL, 4))
png_handle_pCAL(png_ptr, info_ptr, length);
#endif
+#if defined(PNG_READ_sCAL_SUPPORTED)
+ else if (!png_memcmp(png_ptr->chunk_name, png_sCAL, 4))
+ png_handle_sCAL(png_ptr, info_ptr, length);
+#endif
#if defined(PNG_READ_pHYs_SUPPORTED)
else if (!png_memcmp(png_ptr->chunk_name, png_pHYs, 4))
png_handle_pHYs(png_ptr, info_ptr, length);
else if (!png_memcmp(png_ptr->chunk_name, png_sRGB, 4))
png_handle_sRGB(png_ptr, info_ptr, length);
#endif
+#if defined(PNG_READ_iCCP_SUPPORTED)
+ else if (!png_memcmp(png_ptr->chunk_name, png_iCCP, 4))
+ png_handle_iCCP(png_ptr, info_ptr, length);
+#endif
+#if defined(PNG_READ_sPLT_SUPPORTED)
+ else if (!png_memcmp(png_ptr->chunk_name, png_sPLT, 4))
+ png_handle_sPLT(png_ptr, info_ptr, length);
+#endif
#if defined(PNG_READ_tEXt_SUPPORTED)
else if (!png_memcmp(png_ptr->chunk_name, png_tEXt, 4))
png_handle_tEXt(png_ptr, info_ptr, length);
#if defined(PNG_READ_zTXt_SUPPORTED)
else if (!png_memcmp(png_ptr->chunk_name, png_zTXt, 4))
png_handle_zTXt(png_ptr, info_ptr, length);
+#endif
+#if defined(PNG_READ_iTXt_SUPPORTED)
+ else if (!png_memcmp(png_ptr->chunk_name, png_iTXt, 4))
+ png_handle_iTXt(png_ptr, info_ptr, length);
#endif
else
png_handle_unknown(png_ptr, info_ptr, length);
}
/* optional call to update the users info_ptr structure */
-void
+void PNGAPI
png_read_update_info(png_structp png_ptr, png_infop info_ptr)
{
png_debug(1, "in png_read_update_info\n");
- /* save jump buffer and error functions */
if (!(png_ptr->flags & PNG_FLAG_ROW_INIT))
png_read_start_row(png_ptr);
+ else
+ png_warning(png_ptr,
+ "Ignoring extra png_read_update_info() call; row buffer not reallocated");
png_read_transform_info(png_ptr, info_ptr);
}
* the user to obtain a gamma-corrected palette, for example.
* If the user doesn't call this, we will do it ourselves.
*/
-void
+void PNGAPI
png_start_read_image(png_structp png_ptr)
{
png_debug(1, "in png_start_read_image\n");
- /* save jump buffer and error functions */
if (!(png_ptr->flags & PNG_FLAG_ROW_INIT))
png_read_start_row(png_ptr);
}
-void
+void PNGAPI
png_read_row(png_structp png_ptr, png_bytep row, png_bytep dsp_row)
{
+#ifdef PNG_USE_LOCAL_ARRAYS
+ PNG_IDAT;
+ const int png_pass_dsp_mask[7] = {0xff, 0x0f, 0xff, 0x33, 0xff, 0x55, 0xff};
+ const int png_pass_mask[7] = {0x80, 0x08, 0x88, 0x22, 0xaa, 0x55, 0xff};
+#endif
int ret;
- png_debug2(1, "in png_read_row (row %d, pass %d)\n",
+ png_debug2(1, "in png_read_row (row %lu, pass %d)\n",
png_ptr->row_number, png_ptr->pass);
- /* save jump buffer and error functions */
if (!(png_ptr->flags & PNG_FLAG_ROW_INIT))
png_read_start_row(png_ptr);
if (png_ptr->row_number == 0 && png_ptr->pass == 0)
switch (png_ptr->pass)
{
case 0:
- if (png_ptr->row_number & 7)
+ if (png_ptr->row_number & 0x07)
{
if (dsp_row != NULL)
png_combine_row(png_ptr, dsp_row,
}
break;
case 1:
- if ((png_ptr->row_number & 7) || png_ptr->width < 5)
+ if ((png_ptr->row_number & 0x07) || png_ptr->width < 5)
{
if (dsp_row != NULL)
png_combine_row(png_ptr, dsp_row,
}
break;
case 2:
- if ((png_ptr->row_number & 7) != 4)
+ if ((png_ptr->row_number & 0x07) != 4)
{
if (dsp_row != NULL && (png_ptr->row_number & 4))
png_combine_row(png_ptr, dsp_row,
png_read_data(png_ptr, chunk_length, 4);
png_ptr->idat_size = png_get_uint_32(chunk_length);
+ if (png_ptr->idat_size > PNG_MAX_UINT)
+ png_error(png_ptr, "Invalid chunk length.");
+
png_reset_crc(png_ptr);
png_crc_read(png_ptr, png_ptr->chunk_name, 4);
if (png_memcmp(png_ptr->chunk_name, png_IDAT, 4))
png_ptr->row_info.channels = png_ptr->channels;
png_ptr->row_info.bit_depth = png_ptr->bit_depth;
png_ptr->row_info.pixel_depth = png_ptr->pixel_depth;
- {
- png_ptr->row_info.rowbytes = ((png_ptr->row_info.width *
- (png_uint_32)png_ptr->row_info.pixel_depth + 7) >> 3);
- }
+ png_ptr->row_info.rowbytes = ((png_ptr->row_info.width *
+ (png_uint_32)png_ptr->row_info.pixel_depth + 7) >> 3);
+ if(png_ptr->row_buf[0])
png_read_filter_row(png_ptr, &(png_ptr->row_info),
png_ptr->row_buf + 1, png_ptr->prev_row + 1,
(int)(png_ptr->row_buf[0]));
png_memcpy_check(png_ptr, png_ptr->prev_row, png_ptr->row_buf,
png_ptr->rowbytes + 1);
+
+#if defined(PNG_MNG_FEATURES_SUPPORTED)
+ if((png_ptr->mng_features_permitted & PNG_FLAG_MNG_FILTER_64) &&
+ (png_ptr->filter_type == PNG_INTRAPIXEL_DIFFERENCING))
+ {
+ /* Intrapixel differencing */
+ png_do_read_intrapixel(&(png_ptr->row_info), png_ptr->row_buf + 1);
+ }
+#endif
if (png_ptr->transformations)
png_do_read_transformations(png_ptr);
(png_ptr->transformations & PNG_INTERLACE))
{
if (png_ptr->pass < 6)
+/* old interface (pre-1.0.9):
png_do_read_interlace(&(png_ptr->row_info),
png_ptr->row_buf + 1, png_ptr->pass, png_ptr->transformations);
+ */
+ png_do_read_interlace(png_ptr);
if (dsp_row != NULL)
png_combine_row(png_ptr, dsp_row,
* not called png_set_interlace_handling(), the display_row buffer will
* be ignored, so pass NULL to it.
*
- * [*] png_handle_alpha() does not exist yet, as of libpng version 1.0.3.
+ * [*] png_handle_alpha() does not exist yet, as of libpng version 1.2.4
*/
-void
+void PNGAPI
png_read_rows(png_structp png_ptr, png_bytepp row,
png_bytepp display_row, png_uint_32 num_rows)
{
png_bytepp dp;
png_debug(1, "in png_read_rows\n");
- /* save jump buffer and error functions */
rp = row;
dp = display_row;
if (rp != NULL && dp != NULL)
for (i = 0; i < num_rows; i++)
{
png_bytep rptr = *rp;
- png_read_row(png_ptr, rptr, NULL);
+ png_read_row(png_ptr, rptr, png_bytep_NULL);
rp++;
}
else if(dp != NULL)
for (i = 0; i < num_rows; i++)
{
png_bytep dptr = *dp;
- png_read_row(png_ptr, NULL, dptr);
+ png_read_row(png_ptr, png_bytep_NULL, dptr);
dp++;
}
}
* only call this function once. If you desire to have an image for
* each pass of a interlaced image, use png_read_rows() instead.
*
- * [*] png_handle_alpha() does not exist yet, as of libpng version 1.0.3.
+ * [*] png_handle_alpha() does not exist yet, as of libpng version 1.2.4
*/
-void
+void PNGAPI
png_read_image(png_structp png_ptr, png_bytepp image)
{
png_uint_32 i,image_height;
png_bytepp rp;
png_debug(1, "in png_read_image\n");
- /* save jump buffer and error functions */
+
+#ifdef PNG_READ_INTERLACING_SUPPORTED
pass = png_set_interlace_handling(png_ptr);
+#else
+ if (png_ptr->interlaced)
+ png_error(png_ptr,
+ "Cannot read interlaced image -- interlace handler disabled.");
+ pass = 1;
+#endif
+
image_height=png_ptr->height;
png_ptr->num_rows = image_height; /* Make sure this is set correctly */
rp = image;
for (i = 0; i < image_height; i++)
{
- png_read_row(png_ptr, *rp, NULL);
+ png_read_row(png_ptr, *rp, png_bytep_NULL);
rp++;
}
}
* file, will verify the end is accurate, and will read any comments
* or time information at the end of the file, if info is not NULL.
*/
-void
+void PNGAPI
png_read_end(png_structp png_ptr, png_infop info_ptr)
{
png_byte chunk_length[4];
png_uint_32 length;
png_debug(1, "in png_read_end\n");
- /* save jump buffer and error functions */
png_crc_finish(png_ptr, 0); /* Finish off CRC from last IDAT chunk */
do
{
+#ifdef PNG_USE_LOCAL_ARRAYS
+ PNG_IHDR;
+ PNG_IDAT;
+ PNG_IEND;
+ PNG_PLTE;
+#if defined(PNG_READ_bKGD_SUPPORTED)
+ PNG_bKGD;
+#endif
+#if defined(PNG_READ_cHRM_SUPPORTED)
+ PNG_cHRM;
+#endif
+#if defined(PNG_READ_gAMA_SUPPORTED)
+ PNG_gAMA;
+#endif
+#if defined(PNG_READ_hIST_SUPPORTED)
+ PNG_hIST;
+#endif
+#if defined(PNG_READ_iCCP_SUPPORTED)
+ PNG_iCCP;
+#endif
+#if defined(PNG_READ_iTXt_SUPPORTED)
+ PNG_iTXt;
+#endif
+#if defined(PNG_READ_oFFs_SUPPORTED)
+ PNG_oFFs;
+#endif
+#if defined(PNG_READ_pCAL_SUPPORTED)
+ PNG_pCAL;
+#endif
+#if defined(PNG_READ_pHYs_SUPPORTED)
+ PNG_pHYs;
+#endif
+#if defined(PNG_READ_sBIT_SUPPORTED)
+ PNG_sBIT;
+#endif
+#if defined(PNG_READ_sCAL_SUPPORTED)
+ PNG_sCAL;
+#endif
+#if defined(PNG_READ_sPLT_SUPPORTED)
+ PNG_sPLT;
+#endif
+#if defined(PNG_READ_sRGB_SUPPORTED)
+ PNG_sRGB;
+#endif
+#if defined(PNG_READ_tEXt_SUPPORTED)
+ PNG_tEXt;
+#endif
+#if defined(PNG_READ_tIME_SUPPORTED)
+ PNG_tIME;
+#endif
+#if defined(PNG_READ_tRNS_SUPPORTED)
+ PNG_tRNS;
+#endif
+#if defined(PNG_READ_zTXt_SUPPORTED)
+ PNG_zTXt;
+#endif
+#endif /* PNG_GLOBAL_ARRAYS */
+
png_read_data(png_ptr, chunk_length, 4);
length = png_get_uint_32(chunk_length);
png_debug1(0, "Reading %s chunk.\n", png_ptr->chunk_name);
+ if (length > PNG_MAX_UINT)
+ png_error(png_ptr, "Invalid chunk length.");
+
if (!png_memcmp(png_ptr->chunk_name, png_IHDR, 4))
png_handle_IHDR(png_ptr, info_ptr, length);
+ else if (!png_memcmp(png_ptr->chunk_name, png_IEND, 4))
+ png_handle_IEND(png_ptr, info_ptr, length);
+#ifdef PNG_HANDLE_AS_UNKNOWN_SUPPORTED
+ else if (png_handle_as_unknown(png_ptr, png_ptr->chunk_name))
+ {
+ if (!png_memcmp(png_ptr->chunk_name, png_IDAT, 4))
+ {
+ if (length > 0 || png_ptr->mode & PNG_AFTER_IDAT)
+ png_error(png_ptr, "Too many IDAT's found");
+ }
+ else
+ png_ptr->mode |= PNG_AFTER_IDAT;
+ png_handle_unknown(png_ptr, info_ptr, length);
+ if (!png_memcmp(png_ptr->chunk_name, png_PLTE, 4))
+ png_ptr->mode |= PNG_HAVE_PLTE;
+ }
+#endif
else if (!png_memcmp(png_ptr->chunk_name, png_IDAT, 4))
{
/* Zero length IDATs are legal after the last IDAT has been
*/
if (length > 0 || png_ptr->mode & PNG_AFTER_IDAT)
png_error(png_ptr, "Too many IDAT's found");
- else
- png_crc_finish(png_ptr, 0);
+ png_crc_finish(png_ptr, length);
}
else if (!png_memcmp(png_ptr->chunk_name, png_PLTE, 4))
png_handle_PLTE(png_ptr, info_ptr, length);
- else if (!png_memcmp(png_ptr->chunk_name, png_IEND, 4))
- png_handle_IEND(png_ptr, info_ptr, length);
#if defined(PNG_READ_bKGD_SUPPORTED)
else if (!png_memcmp(png_ptr->chunk_name, png_bKGD, 4))
png_handle_bKGD(png_ptr, info_ptr, length);
else if (!png_memcmp(png_ptr->chunk_name, png_pCAL, 4))
png_handle_pCAL(png_ptr, info_ptr, length);
#endif
+#if defined(PNG_READ_sCAL_SUPPORTED)
+ else if (!png_memcmp(png_ptr->chunk_name, png_sCAL, 4))
+ png_handle_sCAL(png_ptr, info_ptr, length);
+#endif
#if defined(PNG_READ_pHYs_SUPPORTED)
else if (!png_memcmp(png_ptr->chunk_name, png_pHYs, 4))
png_handle_pHYs(png_ptr, info_ptr, length);
else if (!png_memcmp(png_ptr->chunk_name, png_sRGB, 4))
png_handle_sRGB(png_ptr, info_ptr, length);
#endif
+#if defined(PNG_READ_iCCP_SUPPORTED)
+ else if (!png_memcmp(png_ptr->chunk_name, png_iCCP, 4))
+ png_handle_iCCP(png_ptr, info_ptr, length);
+#endif
+#if defined(PNG_READ_sPLT_SUPPORTED)
+ else if (!png_memcmp(png_ptr->chunk_name, png_sPLT, 4))
+ png_handle_sPLT(png_ptr, info_ptr, length);
+#endif
#if defined(PNG_READ_tEXt_SUPPORTED)
else if (!png_memcmp(png_ptr->chunk_name, png_tEXt, 4))
png_handle_tEXt(png_ptr, info_ptr, length);
#if defined(PNG_READ_zTXt_SUPPORTED)
else if (!png_memcmp(png_ptr->chunk_name, png_zTXt, 4))
png_handle_zTXt(png_ptr, info_ptr, length);
+#endif
+#if defined(PNG_READ_iTXt_SUPPORTED)
+ else if (!png_memcmp(png_ptr->chunk_name, png_iTXt, 4))
+ png_handle_iTXt(png_ptr, info_ptr, length);
#endif
else
png_handle_unknown(png_ptr, info_ptr, length);
}
/* free all memory used by the read */
-void
+void PNGAPI
png_destroy_read_struct(png_structpp png_ptr_ptr, png_infopp info_ptr_ptr,
png_infopp end_info_ptr_ptr)
{
png_infop info_ptr = NULL, end_info_ptr = NULL;
#ifdef PNG_USER_MEM_SUPPORTED
png_free_ptr free_fn = NULL;
-#endif /* PNG_USER_MEM_SUPPORTED */
+ png_voidp mem_ptr = NULL;
+#endif
png_debug(1, "in png_destroy_read_struct\n");
- /* save jump buffer and error functions */
if (png_ptr_ptr != NULL)
png_ptr = *png_ptr_ptr;
#ifdef PNG_USER_MEM_SUPPORTED
free_fn = png_ptr->free_fn;
+ mem_ptr = png_ptr->mem_ptr;
#endif
png_read_destroy(png_ptr, info_ptr, end_info_ptr);
if (info_ptr != NULL)
{
-#if defined(PNG_READ_tEXt_SUPPORTED) || defined(PNG_READ_zTXt_SUPPORTED)
- png_free(png_ptr, info_ptr->text);
+#if defined(PNG_TEXT_SUPPORTED)
+ png_free_data(png_ptr, info_ptr, PNG_FREE_TEXT, -1);
#endif
#ifdef PNG_USER_MEM_SUPPORTED
- png_destroy_struct_2((png_voidp)info_ptr, free_fn);
+ png_destroy_struct_2((png_voidp)info_ptr, (png_free_ptr)free_fn,
+ (png_voidp)mem_ptr);
#else
png_destroy_struct((png_voidp)info_ptr);
#endif
- *info_ptr_ptr = (png_infop)NULL;
+ *info_ptr_ptr = NULL;
}
if (end_info_ptr != NULL)
{
-#if defined(PNG_READ_tEXt_SUPPORTED) || defined(PNG_READ_zTXt_SUPPORTED)
- png_free(png_ptr, end_info_ptr->text);
+#if defined(PNG_READ_TEXT_SUPPORTED)
+ png_free_data(png_ptr, end_info_ptr, PNG_FREE_TEXT, -1);
#endif
#ifdef PNG_USER_MEM_SUPPORTED
- png_destroy_struct_2((png_voidp)end_info_ptr, free_fn);
+ png_destroy_struct_2((png_voidp)end_info_ptr, (png_free_ptr)free_fn,
+ (png_voidp)mem_ptr);
#else
png_destroy_struct((png_voidp)end_info_ptr);
#endif
- *end_info_ptr_ptr = (png_infop)NULL;
+ *end_info_ptr_ptr = NULL;
}
if (png_ptr != NULL)
{
#ifdef PNG_USER_MEM_SUPPORTED
- png_destroy_struct_2((png_voidp)png_ptr, free_fn);
+ png_destroy_struct_2((png_voidp)png_ptr, (png_free_ptr)free_fn,
+ (png_voidp)mem_ptr);
#else
png_destroy_struct((png_voidp)png_ptr);
#endif
- *png_ptr_ptr = (png_structp)NULL;
+ *png_ptr_ptr = NULL;
}
}
/* free all memory used by the read (old method) */
-void
+void /* PRIVATE */
png_read_destroy(png_structp png_ptr, png_infop info_ptr, png_infop end_info_ptr)
{
+#ifdef PNG_SETJMP_SUPPORTED
jmp_buf tmp_jmp;
+#endif
png_error_ptr error_fn;
png_error_ptr warning_fn;
png_voidp error_ptr;
#endif
png_debug(1, "in png_read_destroy\n");
- /* save jump buffer and error functions */
if (info_ptr != NULL)
png_info_destroy(png_ptr, info_ptr);
png_info_destroy(png_ptr, end_info_ptr);
png_free(png_ptr, png_ptr->zbuf);
- png_free(png_ptr, png_ptr->row_buf);
+ png_free(png_ptr, png_ptr->big_row_buf);
png_free(png_ptr, png_ptr->prev_row);
#if defined(PNG_READ_DITHER_SUPPORTED)
png_free(png_ptr, png_ptr->palette_lookup);
png_free(png_ptr, png_ptr->gamma_from_1);
png_free(png_ptr, png_ptr->gamma_to_1);
#endif
- if (png_ptr->flags & PNG_FLAG_FREE_PALETTE)
+#ifdef PNG_FREE_ME_SUPPORTED
+ if (png_ptr->free_me & PNG_FREE_PLTE)
png_zfree(png_ptr, png_ptr->palette);
- if (png_ptr->flags & PNG_FLAG_FREE_TRANS)
+ png_ptr->free_me &= ~PNG_FREE_PLTE;
+#else
+ if (png_ptr->flags & PNG_FLAG_FREE_PLTE)
+ png_zfree(png_ptr, png_ptr->palette);
+ png_ptr->flags &= ~PNG_FLAG_FREE_PLTE;
+#endif
+#if defined(PNG_tRNS_SUPPORTED) || \
+ defined(PNG_READ_EXPAND_SUPPORTED) || defined(PNG_READ_BACKGROUND_SUPPORTED)
+#ifdef PNG_FREE_ME_SUPPORTED
+ if (png_ptr->free_me & PNG_FREE_TRNS)
png_free(png_ptr, png_ptr->trans);
+ png_ptr->free_me &= ~PNG_FREE_TRNS;
+#else
+ if (png_ptr->flags & PNG_FLAG_FREE_TRNS)
+ png_free(png_ptr, png_ptr->trans);
+ png_ptr->flags &= ~PNG_FLAG_FREE_TRNS;
+#endif
+#endif
#if defined(PNG_READ_hIST_SUPPORTED)
+#ifdef PNG_FREE_ME_SUPPORTED
+ if (png_ptr->free_me & PNG_FREE_HIST)
+ png_free(png_ptr, png_ptr->hist);
+ png_ptr->free_me &= ~PNG_FREE_HIST;
+#else
if (png_ptr->flags & PNG_FLAG_FREE_HIST)
png_free(png_ptr, png_ptr->hist);
+ png_ptr->flags &= ~PNG_FLAG_FREE_HIST;
+#endif
#endif
#if defined(PNG_READ_GAMMA_SUPPORTED)
if (png_ptr->gamma_16_table != NULL)
#endif
#if defined(PNG_TIME_RFC1123_SUPPORTED)
png_free(png_ptr, png_ptr->time_buffer);
-#endif /* PNG_TIME_RFC1123_SUPPORTED */
+#endif
inflateEnd(&png_ptr->zstream);
#ifdef PNG_PROGRESSIVE_READ_SUPPORTED
png_free(png_ptr, png_ptr->save_buffer);
#endif
+#ifdef PNG_PROGRESSIVE_READ_SUPPORTED
+#ifdef PNG_TEXT_SUPPORTED
+ png_free(png_ptr, png_ptr->current_text);
+#endif /* PNG_TEXT_SUPPORTED */
+#endif /* PNG_PROGRESSIVE_READ_SUPPORTED */
+
/* Save the important info out of the png_struct, in case it is
* being used again.
*/
+#ifdef PNG_SETJMP_SUPPORTED
png_memcpy(tmp_jmp, png_ptr->jmpbuf, sizeof (jmp_buf));
+#endif
error_fn = png_ptr->error_fn;
warning_fn = png_ptr->warning_fn;
png_ptr->free_fn = free_fn;
#endif
+#ifdef PNG_SETJMP_SUPPORTED
png_memcpy(png_ptr->jmpbuf, tmp_jmp, sizeof (jmp_buf));
+#endif
+
}
-void
+void PNGAPI
png_set_read_status_fn(png_structp png_ptr, png_read_status_ptr read_row_fn)
{
png_ptr->read_row_fn = read_row_fn;
}
+
+#if defined(PNG_INFO_IMAGE_SUPPORTED)
+void PNGAPI
+png_read_png(png_structp png_ptr, png_infop info_ptr,
+ int transforms,
+ voidp params)
+{
+ int row;
+
+#if defined(PNG_READ_INVERT_ALPHA_SUPPORTED)
+ /* invert the alpha channel from opacity to transparency */
+ if (transforms & PNG_TRANSFORM_INVERT_ALPHA)
+ png_set_invert_alpha(png_ptr);
+#endif
+
+ /* The call to png_read_info() gives us all of the information from the
+ * PNG file before the first IDAT (image data chunk).
+ */
+ png_read_info(png_ptr, info_ptr);
+
+ /* -------------- image transformations start here ------------------- */
+
+#if defined(PNG_READ_16_TO_8_SUPPORTED)
+ /* tell libpng to strip 16 bit/color files down to 8 bits/color */
+ if (transforms & PNG_TRANSFORM_STRIP_16)
+ png_set_strip_16(png_ptr);
+#endif
+
+#if defined(PNG_READ_STRIP_ALPHA_SUPPORTED)
+ /* Strip alpha bytes from the input data without combining with the
+ * background (not recommended).
+ */
+ if (transforms & PNG_TRANSFORM_STRIP_ALPHA)
+ png_set_strip_alpha(png_ptr);
+#endif
+
+#if defined(PNG_READ_PACK_SUPPORTED) && !defined(PNG_READ_EXPAND_SUPPORTED)
+ /* Extract multiple pixels with bit depths of 1, 2, and 4 from a single
+ * byte into separate bytes (useful for paletted and grayscale images).
+ */
+ if (transforms & PNG_TRANSFORM_PACKING)
+ png_set_packing(png_ptr);
+#endif
+
+#if defined(PNG_READ_PACKSWAP_SUPPORTED)
+ /* Change the order of packed pixels to least significant bit first
+ * (not useful if you are using png_set_packing). */
+ if (transforms & PNG_TRANSFORM_PACKSWAP)
+ png_set_packswap(png_ptr);
+#endif
+
+#if defined(PNG_READ_EXPAND_SUPPORTED)
+ /* Expand paletted colors into true RGB triplets
+ * Expand grayscale images to full 8 bits from 1, 2, or 4 bits/pixel
+ * Expand paletted or RGB images with transparency to full alpha
+ * channels so the data will be available as RGBA quartets.
+ */
+ if (transforms & PNG_TRANSFORM_EXPAND)
+ if ((png_ptr->bit_depth < 8) ||
+ (png_ptr->color_type == PNG_COLOR_TYPE_PALETTE) ||
+ (png_get_valid(png_ptr, info_ptr, PNG_INFO_tRNS)))
+ png_set_expand(png_ptr);
+#endif
+
+ /* We don't handle background color or gamma transformation or dithering. */
+
+#if defined(PNG_READ_INVERT_SUPPORTED)
+ /* invert monochrome files to have 0 as white and 1 as black */
+ if (transforms & PNG_TRANSFORM_INVERT_MONO)
+ png_set_invert_mono(png_ptr);
+#endif
+
+#if defined(PNG_READ_SHIFT_SUPPORTED)
+ /* If you want to shift the pixel values from the range [0,255] or
+ * [0,65535] to the original [0,7] or [0,31], or whatever range the
+ * colors were originally in:
+ */
+ if ((transforms & PNG_TRANSFORM_SHIFT)
+ && png_get_valid(png_ptr, info_ptr, PNG_INFO_sBIT))
+ {
+ png_color_8p sig_bit;
+
+ png_get_sBIT(png_ptr, info_ptr, &sig_bit);
+ png_set_shift(png_ptr, sig_bit);
+ }
+#endif
+
+#if defined(PNG_READ_BGR_SUPPORTED)
+ /* flip the RGB pixels to BGR (or RGBA to BGRA) */
+ if (transforms & PNG_TRANSFORM_BGR)
+ png_set_bgr(png_ptr);
+#endif
+
+#if defined(PNG_READ_SWAP_ALPHA_SUPPORTED)
+ /* swap the RGBA or GA data to ARGB or AG (or BGRA to ABGR) */
+ if (transforms & PNG_TRANSFORM_SWAP_ALPHA)
+ png_set_swap_alpha(png_ptr);
+#endif
+
+#if defined(PNG_READ_SWAP_SUPPORTED)
+ /* swap bytes of 16 bit files to least significant byte first */
+ if (transforms & PNG_TRANSFORM_SWAP_ENDIAN)
+ png_set_swap(png_ptr);
+#endif
+
+ /* We don't handle adding filler bytes */
+
+ /* Optional call to gamma correct and add the background to the palette
+ * and update info structure. REQUIRED if you are expecting libpng to
+ * update the palette for you (i.e., you selected such a transform above).
+ */
+ png_read_update_info(png_ptr, info_ptr);
+
+ /* -------------- image transformations end here ------------------- */
+
+#ifdef PNG_FREE_ME_SUPPORTED
+ png_free_data(png_ptr, info_ptr, PNG_FREE_ROWS, 0);
+#endif
+ if(info_ptr->row_pointers == NULL)
+ {
+ info_ptr->row_pointers = (png_bytepp)png_malloc(png_ptr,
+ info_ptr->height * sizeof(png_bytep));
+#ifdef PNG_FREE_ME_SUPPORTED
+ info_ptr->free_me |= PNG_FREE_ROWS;
+#endif
+ for (row = 0; row < (int)info_ptr->height; row++)
+ {
+ info_ptr->row_pointers[row] = (png_bytep)png_malloc(png_ptr,
+ png_get_rowbytes(png_ptr, info_ptr));
+ }
+ }
+
+ png_read_image(png_ptr, info_ptr->row_pointers);
+ info_ptr->valid |= PNG_INFO_IDAT;
+
+ /* read rest of file, and get additional chunks in info_ptr - REQUIRED */
+ png_read_end(png_ptr, info_ptr);
+
+ if(transforms == 0 || params == NULL)
+ /* quiet compiler warnings */ return;
+
+}
+#endif
/* pngrio.c - functions for data input
*
- * libpng 1.0.3 - January 14, 1999
+ * libpng 1.2.4 - July 8, 2002
* For conditions of distribution and use, see copyright notice in png.h
- * Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.
- * Copyright (c) 1996, 1997 Andreas Dilger
- * Copyright (c) 1998, 1999 Glenn Randers-Pehrson
+ * Copyright (c) 1998-2002 Glenn Randers-Pehrson
+ * (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger)
+ * (Version 0.88 Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.)
*
* This file provides a location for all input. Users who need
* special handling are expected to write a function that has the same
with very small lengths, so you should implement some kind of simple
buffering if you are using unbuffered reads. This should never be asked
to read more then 64K on a 16 bit machine. */
-void
+void /* PRIVATE */
png_read_data(png_structp png_ptr, png_bytep data, png_size_t length)
{
- png_debug1(4,"reading %d bytes\n", length);
+ png_debug1(4,"reading %d bytes\n", (int)length);
if (png_ptr->read_data_fn != NULL)
(*(png_ptr->read_data_fn))(png_ptr, data, length);
else
read_data function and use it at run time with png_set_read_fn(), rather
than changing the library. */
#ifndef USE_FAR_KEYWORD
-#ifdef __VISAGECPP__
-static void _Optlink
+void PNGAPI
png_default_read_data(png_structp png_ptr, png_bytep data, png_size_t length)
-#else
-static void
-png_default_read_data(png_structp png_ptr, png_bytep data, png_size_t length)
-#endif
{
png_size_t check;
/* fread() returns 0 on error, so it is OK to store this in a png_size_t
* instead of an int, which is what fread() actually returns.
*/
+#if defined(_WIN32_WCE)
+ if ( !ReadFile((HANDLE)(png_ptr->io_ptr), data, length, &check, NULL) )
+ check = 0;
+#else
check = (png_size_t)fread(data, (png_size_t)1, length,
- (FILE *)png_ptr->io_ptr);
+ (png_FILE_p)png_ptr->io_ptr);
+#endif
if (check != length)
- {
png_error(png_ptr, "Read Error");
- }
}
#else
/* this is the model-independent version. Since the standard I/O library
#define NEAR_BUF_SIZE 1024
#define MIN(a,b) (a <= b ? a : b)
-static void
+static void /* PRIVATE */
png_default_read_data(png_structp png_ptr, png_bytep data, png_size_t length)
{
int check;
png_byte *n_data;
- FILE *io_ptr;
+ png_FILE_p io_ptr;
/* Check if data really is near. If so, use usual code. */
n_data = (png_byte *)CVT_PTR_NOCHECK(data);
- io_ptr = (FILE *)CVT_PTR(png_ptr->io_ptr);
+ io_ptr = (png_FILE_p)CVT_PTR(png_ptr->io_ptr);
if ((png_bytep)n_data == data)
{
+#if defined(_WIN32_WCE)
+ if ( !ReadFile((HANDLE)(png_ptr->io_ptr), data, length, &check, NULL) )
+ check = 0;
+#else
check = fread(n_data, 1, length, io_ptr);
+#endif
}
else
{
do
{
read = MIN(NEAR_BUF_SIZE, remaining);
+#if defined(_WIN32_WCE)
+ if ( !ReadFile((HANDLE)(io_ptr), buf, read, &err, NULL) )
+ err = 0;
+#else
err = fread(buf, (png_size_t)1, read, io_ptr);
+#endif
png_memcpy(data, buf, read); /* copy far buffer to near buffer */
if(err != read)
break;
while (remaining != 0);
}
if ((png_uint_32)check != (png_uint_32)length)
- {
png_error(png_ptr, "read Error");
- }
}
#endif
#endif
unsigned int that is the number of bytes to be read.
To exit and output any fatal error messages the new write
function should call png_error(png_ptr, "Error msg"). */
-void
+void PNGAPI
png_set_read_fn(png_structp png_ptr, png_voidp io_ptr,
png_rw_ptr read_data_fn)
{
#if defined(PNG_WRITE_FLUSH_SUPPORTED)
png_ptr->output_flush_fn = NULL;
-#endif /* PNG_WRITE_FLUSH_SUPPORTED */
+#endif
}
-
/* pngrtran.c - transforms the data in a row for PNG readers
*
- * libpng 1.0.3 - January 14, 1999
+ * libpng 1.2.4 - July 8, 2002
* For conditions of distribution and use, see copyright notice in png.h
- * Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.
- * Copyright (c) 1996, 1997 Andreas Dilger
- * Copyright (c) 1998, 1999 Glenn Randers-Pehrson
+ * Copyright (c) 1998-2002 Glenn Randers-Pehrson
+ * (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger)
+ * (Version 0.88 Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.)
*
* This file contains functions optionally called by an application
* in order to tell libpng how to handle data when reading a PNG.
#endif
/* Set the action on getting a CRC error for an ancillary or critical chunk. */
-void
+void PNGAPI
png_set_crc_action(png_structp png_ptr, int crit_action, int ancil_action)
{
png_debug(1, "in png_set_crc_action\n");
}
}
-#if defined(PNG_READ_BACKGROUND_SUPPORTED)
+#if defined(PNG_READ_BACKGROUND_SUPPORTED) && \
+ defined(PNG_FLOATING_POINT_SUPPORTED)
/* handle alpha and tRNS via a background color */
-void
+void PNGAPI
png_set_background(png_structp png_ptr,
png_color_16p background_color, int background_gamma_code,
int need_expand, double background_gamma)
/* Note: if need_expand is set and color_type is either RGB or RGB_ALPHA
* (in which case need_expand is superfluous anyway), the background color
* might actually be gray yet not be flagged as such. This is not a problem
- * for the current code, which uses PNG_FLAG_BACKGROUND_IS_GRAY only to
+ * for the current code, which uses PNG_BACKGROUND_IS_GRAY only to
* decide when to do the png_do_gray_to_rgb() transformation.
*/
if ((need_expand && !(png_ptr->color_type & PNG_COLOR_MASK_COLOR)) ||
(!need_expand && background_color->red == background_color->green &&
background_color->red == background_color->blue))
- png_ptr->flags |= PNG_FLAG_BACKGROUND_IS_GRAY;
+ png_ptr->mode |= PNG_BACKGROUND_IS_GRAY;
}
#endif
#if defined(PNG_READ_16_TO_8_SUPPORTED)
/* strip 16 bit depth files to 8 bit depth */
-void
+void PNGAPI
png_set_strip_16(png_structp png_ptr)
{
png_debug(1, "in png_set_strip_16\n");
#endif
#if defined(PNG_READ_STRIP_ALPHA_SUPPORTED)
-void
+void PNGAPI
png_set_strip_alpha(png_structp png_ptr)
{
png_debug(1, "in png_set_strip_alpha\n");
typedef png_dsort FAR * png_dsortp;
typedef png_dsort FAR * FAR * png_dsortpp;
-void
+void PNGAPI
png_set_dither(png_structp png_ptr, png_colorp palette,
int num_palette, int maximum_colors, png_uint_16p histogram,
int full_dither)
Perhaps not the best solution, but good enough. */
int i;
- png_bytep sort;
/* initialize an array to sort colors */
- sort = (png_bytep)png_malloc(png_ptr, (png_uint_32)(num_palette
- * sizeof (png_byte)));
+ png_ptr->dither_sort = (png_bytep)png_malloc(png_ptr,
+ (png_uint_32)(num_palette * sizeof (png_byte)));
- /* initialize the sort array */
+ /* initialize the dither_sort array */
for (i = 0; i < num_palette; i++)
- sort[i] = (png_byte)i;
+ png_ptr->dither_sort[i] = (png_byte)i;
/* Find the least used palette entries by starting a
bubble sort, and running it until we have sorted
done = 1;
for (j = 0; j < i; j++)
{
- if (histogram[sort[j]] < histogram[sort[j + 1]])
+ if (histogram[png_ptr->dither_sort[j]]
+ < histogram[png_ptr->dither_sort[j + 1]])
{
png_byte t;
- t = sort[j];
- sort[j] = sort[j + 1];
- sort[j + 1] = t;
+ t = png_ptr->dither_sort[j];
+ png_ptr->dither_sort[j] = png_ptr->dither_sort[j + 1];
+ png_ptr->dither_sort[j + 1] = t;
done = 0;
}
}
move the others */
for (i = 0; i < maximum_colors; i++)
{
- if ((int)sort[i] >= maximum_colors)
+ if ((int)png_ptr->dither_sort[i] >= maximum_colors)
{
do
j--;
- while ((int)sort[j] >= maximum_colors);
+ while ((int)png_ptr->dither_sort[j] >= maximum_colors);
palette[i] = palette[j];
}
}
for (i = 0; i < maximum_colors; i++)
{
/* only move the colors we need to */
- if ((int)sort[i] >= maximum_colors)
+ if ((int)png_ptr->dither_sort[i] >= maximum_colors)
{
png_color tmp_color;
do
j--;
- while ((int)sort[j] >= maximum_colors);
+ while ((int)png_ptr->dither_sort[j] >= maximum_colors);
tmp_color = palette[j];
palette[j] = palette[i];
}
}
}
- png_free(png_ptr, sort);
+ png_free(png_ptr, png_ptr->dither_sort);
+ png_ptr->dither_sort=NULL;
}
else
{
int i;
int max_d;
int num_new_palette;
+ png_dsortp t;
png_dsortpp hash;
- png_bytep index_to_palette;
- /* where the original index currently is in the palette */
- png_bytep palette_to_index;
- /* which original index points to this palette color */
+
+ t=NULL;
/* initialize palette index arrays */
- index_to_palette = (png_bytep)png_malloc(png_ptr,
+ png_ptr->index_to_palette = (png_bytep)png_malloc(png_ptr,
(png_uint_32)(num_palette * sizeof (png_byte)));
- palette_to_index = (png_bytep)png_malloc(png_ptr,
+ png_ptr->palette_to_index = (png_bytep)png_malloc(png_ptr,
(png_uint_32)(num_palette * sizeof (png_byte)));
/* initialize the sort array */
for (i = 0; i < num_palette; i++)
{
- index_to_palette[i] = (png_byte)i;
- palette_to_index[i] = (png_byte)i;
+ png_ptr->index_to_palette[i] = (png_byte)i;
+ png_ptr->palette_to_index[i] = (png_byte)i;
}
hash = (png_dsortpp)png_malloc(png_ptr, (png_uint_32)(769 *
if (d <= max_d)
{
- png_dsortp t;
- t = (png_dsortp)png_malloc(png_ptr, (png_uint_32)(sizeof
- (png_dsort)));
+ t = (png_dsortp)png_malloc_warn(png_ptr,
+ (png_uint_32)(sizeof(png_dsort)));
+ if (t == NULL)
+ break;
t->next = hash[d];
t->left = (png_byte)i;
t->right = (png_byte)j;
hash[d] = t;
}
}
+ if (t == NULL)
+ break;
}
+ if (t != NULL)
for (i = 0; i <= max_d; i++)
{
if (hash[i] != NULL)
for (p = hash[i]; p; p = p->next)
{
- if ((int)index_to_palette[p->left] < num_new_palette &&
- (int)index_to_palette[p->right] < num_new_palette)
+ if ((int)png_ptr->index_to_palette[p->left]
+ < num_new_palette &&
+ (int)png_ptr->index_to_palette[p->right]
+ < num_new_palette)
{
int j, next_j;
- if (num_new_palette & 1)
+ if (num_new_palette & 0x01)
{
j = p->left;
next_j = p->right;
}
num_new_palette--;
- palette[index_to_palette[j]] = palette[num_new_palette];
+ palette[png_ptr->index_to_palette[j]]
+ = palette[num_new_palette];
if (!full_dither)
{
int k;
for (k = 0; k < num_palette; k++)
{
if (png_ptr->dither_index[k] ==
- index_to_palette[j])
+ png_ptr->index_to_palette[j])
png_ptr->dither_index[k] =
- index_to_palette[next_j];
+ png_ptr->index_to_palette[next_j];
if ((int)png_ptr->dither_index[k] ==
num_new_palette)
png_ptr->dither_index[k] =
- index_to_palette[j];
+ png_ptr->index_to_palette[j];
}
}
- index_to_palette[palette_to_index[num_new_palette]] =
- index_to_palette[j];
- palette_to_index[index_to_palette[j]] =
- palette_to_index[num_new_palette];
+ png_ptr->index_to_palette[png_ptr->palette_to_index
+ [num_new_palette]] = png_ptr->index_to_palette[j];
+ png_ptr->palette_to_index[png_ptr->index_to_palette[j]]
+ = png_ptr->palette_to_index[num_new_palette];
- index_to_palette[j] = (png_byte)num_new_palette;
- palette_to_index[num_new_palette] = (png_byte)j;
+ png_ptr->index_to_palette[j] = (png_byte)num_new_palette;
+ png_ptr->palette_to_index[num_new_palette] = (png_byte)j;
}
if (num_new_palette <= maximum_colors)
break;
png_dsortp p = hash[i];
while (p)
{
- png_dsortp t;
-
t = p->next;
png_free(png_ptr, p);
p = t;
max_d += 96;
}
png_free(png_ptr, hash);
- png_free(png_ptr, palette_to_index);
- png_free(png_ptr, index_to_palette);
+ png_free(png_ptr, png_ptr->palette_to_index);
+ png_free(png_ptr, png_ptr->index_to_palette);
+ png_ptr->palette_to_index=NULL;
+ png_ptr->index_to_palette=NULL;
}
num_palette = maximum_colors;
}
}
#endif
-#if defined(PNG_READ_GAMMA_SUPPORTED)
+#if defined(PNG_READ_GAMMA_SUPPORTED) && defined(PNG_FLOATING_POINT_SUPPORTED)
/* Transform the image from the file_gamma to the screen_gamma. We
* only do transformations on images where the file_gamma and screen_gamma
* are not close reciprocals, otherwise it slows things down slightly, and
* also needlessly introduces small errors.
+ *
+ * We will turn off gamma transformation later if no semitransparent entries
+ * are present in the tRNS array for palette images. We can't do it here
+ * because we don't necessarily have the tRNS chunk yet.
*/
-void
+void PNGAPI
png_set_gamma(png_structp png_ptr, double scrn_gamma, double file_gamma)
{
png_debug(1, "in png_set_gamma\n");
- if (fabs(scrn_gamma * file_gamma - 1.0) > PNG_GAMMA_THRESHOLD)
- png_ptr->transformations |= PNG_GAMMA;
+ if ((fabs(scrn_gamma * file_gamma - 1.0) > PNG_GAMMA_THRESHOLD) ||
+ (png_ptr->color_type & PNG_COLOR_MASK_ALPHA) ||
+ (png_ptr->color_type == PNG_COLOR_TYPE_PALETTE))
+ png_ptr->transformations |= PNG_GAMMA;
png_ptr->gamma = (float)file_gamma;
png_ptr->screen_gamma = (float)scrn_gamma;
}
#endif
#if defined(PNG_READ_EXPAND_SUPPORTED)
-/* Expand paletted images to rgb, expand grayscale images of
- * less than 8 bit depth to 8 bit depth, and expand tRNS chunks
+/* Expand paletted images to RGB, expand grayscale images of
+ * less than 8-bit depth to 8-bit depth, and expand tRNS chunks
* to alpha channels.
*/
-void
+void PNGAPI
png_set_expand(png_structp png_ptr)
{
png_debug(1, "in png_set_expand\n");
png_ptr->transformations |= PNG_EXPAND;
}
-#endif
+
+/* GRR 19990627: the following three functions currently are identical
+ * to png_set_expand(). However, it is entirely reasonable that someone
+ * might wish to expand an indexed image to RGB but *not* expand a single,
+ * fully transparent palette entry to a full alpha channel--perhaps instead
+ * convert tRNS to the grayscale/RGB format (16-bit RGB value), or replace
+ * the transparent color with a particular RGB value, or drop tRNS entirely.
+ * IOW, a future version of the library may make the transformations flag
+ * a bit more fine-grained, with separate bits for each of these three
+ * functions.
+ *
+ * More to the point, these functions make it obvious what libpng will be
+ * doing, whereas "expand" can (and does) mean any number of things.
+ */
+
+/* Expand paletted images to RGB. */
+void PNGAPI
+png_set_palette_to_rgb(png_structp png_ptr)
+{
+ png_debug(1, "in png_set_expand\n");
+ png_ptr->transformations |= PNG_EXPAND;
+}
+
+/* Expand grayscale images of less than 8-bit depth to 8 bits. */
+void PNGAPI
+png_set_gray_1_2_4_to_8(png_structp png_ptr)
+{
+ png_debug(1, "in png_set_expand\n");
+ png_ptr->transformations |= PNG_EXPAND;
+}
+
+/* Expand tRNS chunks to alpha channels. */
+void PNGAPI
+png_set_tRNS_to_alpha(png_structp png_ptr)
+{
+ png_debug(1, "in png_set_expand\n");
+ png_ptr->transformations |= PNG_EXPAND;
+}
+#endif /* defined(PNG_READ_EXPAND_SUPPORTED) */
#if defined(PNG_READ_GRAY_TO_RGB_SUPPORTED)
-void
+void PNGAPI
png_set_gray_to_rgb(png_structp png_ptr)
{
png_debug(1, "in png_set_gray_to_rgb\n");
#endif
#if defined(PNG_READ_RGB_TO_GRAY_SUPPORTED)
+#if defined(PNG_FLOATING_POINT_SUPPORTED)
/* Convert a RGB image to a grayscale of the same width. This allows us,
* for example, to convert a 24 bpp RGB image into an 8 bpp grayscale image.
*/
-void
-png_set_rgb_to_gray(png_structp png_ptr, int error_action, float red,
- float green)
+
+void PNGAPI
+png_set_rgb_to_gray(png_structp png_ptr, int error_action, double red,
+ double green)
+{
+ int red_fixed = (int)((float)red*100000.0 + 0.5);
+ int green_fixed = (int)((float)green*100000.0 + 0.5);
+ png_set_rgb_to_gray_fixed(png_ptr, error_action, red_fixed, green_fixed);
+}
+#endif
+
+void PNGAPI
+png_set_rgb_to_gray_fixed(png_structp png_ptr, int error_action,
+ png_fixed_point red, png_fixed_point green)
{
png_debug(1, "in png_set_rgb_to_gray\n");
switch(error_action)
}
#endif
{
- png_byte red_byte = (png_byte)(red*255.0 + 0.5);
- png_byte green_byte = (png_byte)(green*255.0 + 0.5);
- if(red < 0.0 || green < 0.0)
+ png_uint_16 red_int, green_int;
+ if(red < 0 || green < 0)
{
- red_byte = 54;
- green_byte = 183;
+ red_int = 6968; /* .212671 * 32768 + .5 */
+ green_int = 23434; /* .715160 * 32768 + .5 */
}
- else if(red_byte + green_byte > 255)
+ else if(red + green < 100000L)
+ {
+ red_int = (png_uint_16)(((png_uint_32)red*32768L)/100000L);
+ green_int = (png_uint_16)(((png_uint_32)green*32768L)/100000L);
+ }
+ else
{
png_warning(png_ptr, "ignoring out of range rgb_to_gray coefficients");
- red_byte = 54;
- green_byte = 183;
+ red_int = 6968;
+ green_int = 23434;
}
- png_ptr->rgb_to_gray_red_coeff = red_byte;
- png_ptr->rgb_to_gray_green_coeff = green_byte;
- png_ptr->rgb_to_gray_blue_coeff = 255 - red_byte - green_byte;
+ png_ptr->rgb_to_gray_red_coeff = red_int;
+ png_ptr->rgb_to_gray_green_coeff = green_int;
+ png_ptr->rgb_to_gray_blue_coeff = (png_uint_16)(32768-red_int-green_int);
}
}
#endif
-#if defined(PNG_READ_USER_TRANSFORM_SUPPORTED)
-void
+#if defined(PNG_READ_USER_TRANSFORM_SUPPORTED) || \
+ defined(PNG_WRITE_USER_TRANSFORM_SUPPORTED) || \
+ defined(PNG_LEGACY_SUPPORTED)
+void PNGAPI
png_set_read_user_transform_fn(png_structp png_ptr, png_user_transform_ptr
read_user_transform_fn)
{
png_debug(1, "in png_set_read_user_transform_fn\n");
+#if defined(PNG_READ_USER_TRANSFORM_SUPPORTED)
png_ptr->transformations |= PNG_USER_TRANSFORM;
png_ptr->read_user_transform_fn = read_user_transform_fn;
+#endif
+#ifdef PNG_LEGACY_SUPPORTED
+ if(read_user_transform_fn)
+ png_warning(png_ptr,
+ "This version of libpng does not support user transforms");
+#endif
}
#endif
/* Initialize everything needed for the read. This includes modifying
* the palette.
*/
-void
+void /* PRIVATE */
png_init_read_transformations(png_structp png_ptr)
{
png_debug(1, "in png_init_read_transformations\n");
#endif
#if defined(PNG_READ_EXPAND_SUPPORTED) && defined(PNG_READ_BACKGROUND_SUPPORTED)
- if (png_ptr->transformations & PNG_BACKGROUND_EXPAND)
+ if ((png_ptr->transformations & PNG_BACKGROUND_EXPAND) &&
+ (png_ptr->transformations & PNG_EXPAND))
{
if (!(color_type & PNG_COLOR_MASK_COLOR)) /* i.e., GRAY or GRAY_ALPHA */
{
{
case 1:
png_ptr->background.gray *= (png_uint_16)0xff;
- png_ptr->background.red = png_ptr->background.green =
- png_ptr->background.blue = png_ptr->background.gray;
+ png_ptr->background.red = png_ptr->background.green
+ = png_ptr->background.blue = png_ptr->background.gray;
break;
case 2:
png_ptr->background.gray *= (png_uint_16)0x55;
- png_ptr->background.red = png_ptr->background.green =
- png_ptr->background.blue = png_ptr->background.gray;
+ png_ptr->background.red = png_ptr->background.green
+ = png_ptr->background.blue = png_ptr->background.gray;
break;
case 4:
png_ptr->background.gray *= (png_uint_16)0x11;
- png_ptr->background.red = png_ptr->background.green =
- png_ptr->background.blue = png_ptr->background.gray;
+ png_ptr->background.red = png_ptr->background.green
+ = png_ptr->background.blue = png_ptr->background.gray;
break;
case 8:
case 16:
- png_ptr->background.red = png_ptr->background.green =
- png_ptr->background.blue = png_ptr->background.gray;
+ png_ptr->background.red = png_ptr->background.green
+ = png_ptr->background.blue = png_ptr->background.gray;
break;
}
}
int i,istop;
istop=(int)png_ptr->num_trans;
for (i=0; i<istop; i++)
- png_ptr->trans[i] = 255 - png_ptr->trans[i];
+ png_ptr->trans[i] = (png_byte)(255 - png_ptr->trans[i]);
}
}
#endif
}
#endif
-#if defined(PNG_READ_BACKGROUND_SUPPORTED)
+#if defined(PNG_READ_BACKGROUND_SUPPORTED) && defined(PNG_READ_GAMMA_SUPPORTED)
png_ptr->background_1 = png_ptr->background;
#endif
-#if defined(PNG_READ_GAMMA_SUPPORTED)
+#if defined(PNG_READ_GAMMA_SUPPORTED) && defined(PNG_FLOATING_POINT_SUPPORTED)
+
+ if ((color_type == PNG_COLOR_TYPE_PALETTE && png_ptr->num_trans != 0)
+ && (fabs(png_ptr->screen_gamma * png_ptr->gamma - 1.0)
+ < PNG_GAMMA_THRESHOLD))
+ {
+ int i,k;
+ k=0;
+ for (i=0; i<png_ptr->num_trans; i++)
+ {
+ if (png_ptr->trans[i] != 0 && png_ptr->trans[i] != 0xff)
+ k=1; /* partial transparency is present */
+ }
+ if (k == 0)
+ png_ptr->transformations &= (~PNG_GAMMA);
+ }
+
if (png_ptr->transformations & (PNG_GAMMA | PNG_RGB_TO_GRAY))
{
png_build_gamma_table(png_ptr);
{
if (color_type == PNG_COLOR_TYPE_PALETTE)
{
+ /* could skip if no transparency and
+ */
png_color back, back_1;
png_colorp palette = png_ptr->palette;
int num_palette = png_ptr->num_palette;
int i;
-
if (png_ptr->background_gamma_type == PNG_BACKGROUND_GAMMA_FILE)
{
back.red = png_ptr->gamma_table[png_ptr->background.red];
back_1.blue = (png_byte)(pow(
(double)png_ptr->background.blue/255, g) * 255.0 + .5);
}
-
for (i = 0; i < num_palette; i++)
{
if (i < (int)png_ptr->num_trans && png_ptr->trans[i] != 0xff)
}
}
}
- /* if (png_ptr->background_gamma_type!=PNG_BACKGROUND_GAMMA_UNKNOWN)*/
+ /* if (png_ptr->background_gamma_type!=PNG_BACKGROUND_GAMMA_UNKNOWN) */
else
/* color_type != PNG_COLOR_TYPE_PALETTE */
{
break;
}
- if (color_type & PNG_COLOR_MASK_COLOR)
+ png_ptr->background_1.gray = (png_uint_16)(pow(
+ (double)png_ptr->background.gray / m, g) * m + .5);
+ png_ptr->background.gray = (png_uint_16)(pow(
+ (double)png_ptr->background.gray / m, gs) * m + .5);
+
+ if ((png_ptr->background.red != png_ptr->background.green) ||
+ (png_ptr->background.red != png_ptr->background.blue) ||
+ (png_ptr->background.red != png_ptr->background.gray))
{
- /* RGB or RGBA */
+ /* RGB or RGBA with color background */
png_ptr->background_1.red = (png_uint_16)(pow(
(double)png_ptr->background.red / m, g) * m + .5);
png_ptr->background_1.green = (png_uint_16)(pow(
}
else
{
- /* GRAY or GRAY ALPHA */
- png_ptr->background_1.gray = (png_uint_16)(pow(
- (double)png_ptr->background.gray / m, g) * m + .5);
- png_ptr->background.gray = (png_uint_16)(pow(
- (double)png_ptr->background.gray / m, gs) * m + .5);
+ /* GRAY, GRAY ALPHA, RGB, or RGBA with gray background */
+ png_ptr->background_1.red = png_ptr->background_1.green
+ = png_ptr->background_1.blue = png_ptr->background_1.gray;
+ png_ptr->background.red = png_ptr->background.green
+ = png_ptr->background.blue = png_ptr->background.gray;
}
}
}
else
/* transformation does not include PNG_BACKGROUND */
-#endif
+#endif /* PNG_READ_BACKGROUND_SUPPORTED */
if (color_type == PNG_COLOR_TYPE_PALETTE)
{
png_colorp palette = png_ptr->palette;
#if defined(PNG_READ_BACKGROUND_SUPPORTED)
else
#endif
-#endif
+#endif /* PNG_READ_GAMMA_SUPPORTED && PNG_FLOATING_POINT_SUPPORTED */
#if defined(PNG_READ_BACKGROUND_SUPPORTED)
/* No GAMMA transformation */
- if (png_ptr->transformations & PNG_BACKGROUND &&
- color_type == PNG_COLOR_TYPE_PALETTE)
+ if ((png_ptr->transformations & PNG_BACKGROUND) &&
+ (color_type == PNG_COLOR_TYPE_PALETTE))
{
int i;
int istop = (int)png_ptr->num_trans;
}
}
}
-#endif
+#endif /* PNG_READ_BACKGROUND_SUPPORTED */
#if defined(PNG_READ_SHIFT_SUPPORTED)
if ((png_ptr->transformations & PNG_SHIFT) &&
- color_type == PNG_COLOR_TYPE_PALETTE)
+ (color_type == PNG_COLOR_TYPE_PALETTE))
{
png_uint_16 i;
png_uint_16 istop = png_ptr->num_palette;
png_ptr->palette[i].blue >>= sb;
}
}
-#endif
+#endif /* PNG_READ_SHIFT_SUPPORTED */
}
+#if !defined(PNG_READ_GAMMA_SUPPORTED) && !defined(PNG_READ_SHIFT_SUPPORTED) \
+ && !defined(PNG_READ_BACKGROUND_SUPPORTED)
+ if(png_ptr)
+ return;
+#endif
}
/* Modify the info structure to reflect the transformations. The
* info should be updated so a PNG file could be written with it,
* assuming the transformations result in valid PNG data.
*/
-void
+void /* PRIVATE */
png_read_transform_info(png_structp png_ptr, png_infop info_ptr)
{
png_debug(1, "in png_read_transform_info\n");
#if defined(PNG_READ_GAMMA_SUPPORTED)
if (png_ptr->transformations & PNG_GAMMA)
+ {
+#ifdef PNG_FLOATING_POINT_SUPPORTED
info_ptr->gamma = png_ptr->gamma;
#endif
+#ifdef PNG_FIXED_POINT_SUPPORTED
+ info_ptr->int_gamma = png_ptr->int_gamma;
+#endif
+ }
+#endif
#if defined(PNG_READ_16_TO_8_SUPPORTED)
- if ((png_ptr->transformations & PNG_16_TO_8) && info_ptr->bit_depth == 16)
+ if ((png_ptr->transformations & PNG_16_TO_8) && (info_ptr->bit_depth == 16))
info_ptr->bit_depth = 8;
#endif
#endif
#if defined(PNG_READ_PACK_SUPPORTED)
- if ((png_ptr->transformations & PNG_PACK) && info_ptr->bit_depth < 8)
+ if ((png_ptr->transformations & PNG_PACK) && (info_ptr->bit_depth < 8))
info_ptr->bit_depth = 8;
#endif
#if defined(PNG_READ_FILLER_SUPPORTED)
/* STRIP_ALPHA and FILLER allowed: MASK_ALPHA bit stripped above */
- if (png_ptr->transformations & PNG_FILLER &&
- (info_ptr->color_type == PNG_COLOR_TYPE_RGB ||
- info_ptr->color_type == PNG_COLOR_TYPE_GRAY))
- ++info_ptr->channels;
+ if ((png_ptr->transformations & PNG_FILLER) &&
+ ((info_ptr->color_type == PNG_COLOR_TYPE_RGB) ||
+ (info_ptr->color_type == PNG_COLOR_TYPE_GRAY)))
+ {
+ info_ptr->channels++;
+#if 0 /* if adding a true alpha channel not just filler */
+ info_ptr->color_type |= PNG_COLOR_MASK_ALPHA;
+#endif
+ }
+#endif
+
+#if defined(PNG_USER_TRANSFORM_PTR_SUPPORTED) && \
+defined(PNG_READ_USER_TRANSFORM_SUPPORTED)
+ if(png_ptr->transformations & PNG_USER_TRANSFORM)
+ {
+ if(info_ptr->bit_depth < png_ptr->user_transform_depth)
+ info_ptr->bit_depth = png_ptr->user_transform_depth;
+ if(info_ptr->channels < png_ptr->user_transform_channels)
+ info_ptr->channels = png_ptr->user_transform_channels;
+ }
#endif
info_ptr->pixel_depth = (png_byte)(info_ptr->channels *
info_ptr->bit_depth);
info_ptr->rowbytes = ((info_ptr->width * info_ptr->pixel_depth + 7) >> 3);
+
+#if !defined(PNG_READ_EXPAND_SUPPORTED)
+ if(png_ptr)
+ return;
+#endif
}
/* Transform the row. The order of transformations is significant,
* and is very touchy. If you add a transformation, take care to
* decide how it fits in with the other transformations here.
*/
-void
+void /* PRIVATE */
png_do_read_transformations(png_structp png_ptr)
{
png_debug(1, "in png_do_read_transformations\n");
#if !defined(PNG_USELESS_TESTS_SUPPORTED)
if (png_ptr->row_buf == NULL)
{
-#if !defined(PNG_NO_STDIO)
+#if !defined(PNG_NO_STDIO) && !defined(_WIN32_WCE)
char msg[50];
sprintf(msg, "NULL row buffer for row %ld, pass %d", png_ptr->row_number,
#if defined(PNG_READ_GRAY_TO_RGB_SUPPORTED)
/* if gray -> RGB, do so now only if background is non-gray; else do later
* for performance reasons */
- if (png_ptr->transformations & PNG_GRAY_TO_RGB &&
- !(png_ptr->flags & PNG_FLAG_BACKGROUND_IS_GRAY))
+ if ((png_ptr->transformations & PNG_GRAY_TO_RGB) &&
+ !(png_ptr->mode & PNG_BACKGROUND_IS_GRAY))
png_do_gray_to_rgb(&(png_ptr->row_info), png_ptr->row_buf + 1);
#endif
((png_ptr->num_trans != 0 ) ||
(png_ptr->color_type & PNG_COLOR_MASK_ALPHA)))
png_do_background(&(png_ptr->row_info), png_ptr->row_buf + 1,
- &(png_ptr->trans_values), &(png_ptr->background),
- &(png_ptr->background_1),
+ &(png_ptr->trans_values), &(png_ptr->background)
+#if defined(PNG_READ_GAMMA_SUPPORTED)
+ , &(png_ptr->background_1),
png_ptr->gamma_table, png_ptr->gamma_from_1,
png_ptr->gamma_to_1, png_ptr->gamma_16_table,
png_ptr->gamma_16_from_1, png_ptr->gamma_16_to_1,
- png_ptr->gamma_shift);
+ png_ptr->gamma_shift
+#endif
+);
#endif
#if defined(PNG_READ_GAMMA_SUPPORTED)
#if defined(PNG_READ_GRAY_TO_RGB_SUPPORTED)
/* if gray -> RGB, do so now only if we did not do so above */
- if (png_ptr->transformations & PNG_GRAY_TO_RGB &&
- png_ptr->flags & PNG_FLAG_BACKGROUND_IS_GRAY)
+ if ((png_ptr->transformations & PNG_GRAY_TO_RGB) &&
+ (png_ptr->mode & PNG_BACKGROUND_IS_GRAY))
png_do_gray_to_rgb(&(png_ptr->row_info), png_ptr->row_buf + 1);
#endif
#if defined(PNG_READ_USER_TRANSFORM_SUPPORTED)
if (png_ptr->transformations & PNG_USER_TRANSFORM)
+ {
if(png_ptr->read_user_transform_fn != NULL)
(*(png_ptr->read_user_transform_fn)) /* user read transform function */
(png_ptr, /* png_ptr */
/* png_byte channels; number of channels (1-4) */
/* png_byte pixel_depth; bits per pixel (depth*channels) */
png_ptr->row_buf + 1); /* start of pixel data for row */
+#if defined(PNG_USER_TRANSFORM_PTR_SUPPORTED)
+ if(png_ptr->user_transform_depth)
+ png_ptr->row_info.bit_depth = png_ptr->user_transform_depth;
+ if(png_ptr->user_transform_channels)
+ png_ptr->row_info.channels = png_ptr->user_transform_channels;
+#endif
+ png_ptr->row_info.pixel_depth = (png_byte)(png_ptr->row_info.bit_depth *
+ png_ptr->row_info.channels);
+ png_ptr->row_info.rowbytes = (png_ptr->row_info.width *
+ png_ptr->row_info.pixel_depth+7)>>3;
+ }
#endif
}
* the numbers 0 or 1. If you would rather they contain 0 and 255, use
* png_do_shift() after this.
*/
-void
+void /* PRIVATE */
png_do_unpack(png_row_infop row_info, png_bytep row)
{
png_debug(1, "in png_do_unpack\n");
{
png_bytep sp = row + (png_size_t)((row_width - 1) >> 3);
png_bytep dp = row + (png_size_t)row_width - 1;
- png_uint_32 shift = 7 - (int)((row_width + 7) & 7);
+ png_uint_32 shift = 7 - (int)((row_width + 7) & 0x07);
for (i = 0; i < row_width; i++)
{
- *dp = (png_byte)((*sp >> shift) & 0x1);
+ *dp = (png_byte)((*sp >> shift) & 0x01);
if (shift == 7)
{
shift = 0;
png_bytep sp = row + (png_size_t)((row_width - 1) >> 2);
png_bytep dp = row + (png_size_t)row_width - 1;
- png_uint_32 shift = (int)((3 - ((row_width + 3) & 3)) << 1);
+ png_uint_32 shift = (int)((3 - ((row_width + 3) & 0x03)) << 1);
for (i = 0; i < row_width; i++)
{
- *dp = (png_byte)((*sp >> shift) & 0x3);
+ *dp = (png_byte)((*sp >> shift) & 0x03);
if (shift == 6)
{
shift = 0;
{
png_bytep sp = row + (png_size_t)((row_width - 1) >> 1);
png_bytep dp = row + (png_size_t)row_width - 1;
- png_uint_32 shift = (int)((1 - ((row_width + 1) & 1)) << 2);
+ png_uint_32 shift = (int)((1 - ((row_width + 1) & 0x01)) << 2);
for (i = 0; i < row_width; i++)
{
- *dp = (png_byte)((*sp >> shift) & 0xf);
+ *dp = (png_byte)((*sp >> shift) & 0x0f);
if (shift == 4)
{
shift = 0;
* a row of bit depth 8, but only 5 are significant, this will shift
* the values back to 0 through 31.
*/
-void
+void /* PRIVATE */
png_do_unshift(png_row_infop row_info, png_bytep row, png_color_8p sig_bits)
{
png_debug(1, "in png_do_unshift\n");
png_bytep bp = row;
png_uint_32 i;
png_uint_32 istop = row_info->rowbytes;
- png_byte mask = (png_byte)(((int)0xf0 >> shift[0]) & (int)0xf0) |
- (png_byte)((int)0xf >> shift[0]);
+ png_byte mask = (png_byte)((((int)0xf0 >> shift[0]) & (int)0xf0) |
+ (png_byte)((int)0xf >> shift[0]));
for (i = 0; i < istop; i++)
{
#if defined(PNG_READ_16_TO_8_SUPPORTED)
/* chop rows of bit depth 16 down to 8 */
-void
+void /* PRIVATE */
png_do_chop(png_row_infop row_info, png_bytep row)
{
png_debug(1, "in png_do_chop\n");
#endif
#if defined(PNG_READ_SWAP_ALPHA_SUPPORTED)
-void
+void /* PRIVATE */
png_do_read_swap_alpha(png_row_infop row_info, png_bytep row)
{
png_debug(1, "in png_do_read_swap_alpha\n");
#endif
#if defined(PNG_READ_INVERT_ALPHA_SUPPORTED)
-void
+void /* PRIVATE */
png_do_read_invert_alpha(png_row_infop row_info, png_bytep row)
{
png_debug(1, "in png_do_read_invert_alpha\n");
for (i = 0; i < row_width; i++)
{
- *(--dp) = 255 - *(--sp);
+ *(--dp) = (png_byte)(255 - *(--sp));
+
+/* This does nothing:
*(--dp) = *(--sp);
*(--dp) = *(--sp);
*(--dp) = *(--sp);
+ We can replace it with:
+*/
+ sp-=3;
+ dp=sp;
}
}
/* This inverts the alpha channel in RRGGBBAA */
for (i = 0; i < row_width; i++)
{
- *(--dp) = 255 - *(--sp);
- *(--dp) = 255 - *(--sp);
+ *(--dp) = (png_byte)(255 - *(--sp));
+ *(--dp) = (png_byte)(255 - *(--sp));
+
+/* This does nothing:
*(--dp) = *(--sp);
*(--dp) = *(--sp);
*(--dp) = *(--sp);
*(--dp) = *(--sp);
*(--dp) = *(--sp);
*(--dp) = *(--sp);
+ We can replace it with:
+*/
+ sp-=6;
+ dp=sp;
}
}
}
for (i = 0; i < row_width; i++)
{
- *(--dp) = 255 - *(--sp);
+ *(--dp) = (png_byte)(255 - *(--sp));
*(--dp) = *(--sp);
}
}
for (i = 0; i < row_width; i++)
{
- *(--dp) = 255 - *(--sp);
- *(--dp) = 255 - *(--sp);
+ *(--dp) = (png_byte)(255 - *(--sp));
+ *(--dp) = (png_byte)(255 - *(--sp));
+/*
*(--dp) = *(--sp);
*(--dp) = *(--sp);
+*/
+ sp-=2;
+ dp=sp;
}
}
}
#if defined(PNG_READ_FILLER_SUPPORTED)
/* Add filler channel if we have RGB color */
-void
+void /* PRIVATE */
png_do_read_filler(png_row_infop row_info, png_bytep row,
png_uint_32 filler, png_uint_32 flags)
{
*(--dp) = lo_filler;
row_info->channels = 2;
row_info->pixel_depth = 32;
- row_info->rowbytes = row_width * 2;
+ row_info->rowbytes = row_width * 4;
}
/* This changes the data from GG to XXGG */
else
*(--dp) = lo_filler;
}
row_info->channels = 2;
- row_info->pixel_depth = 16;
- row_info->rowbytes = row_width * 2;
+ row_info->pixel_depth = 32;
+ row_info->rowbytes = row_width * 4;
}
}
} /* COLOR_TYPE == GRAY */
*(--dp) = lo_filler;
row_info->channels = 4;
row_info->pixel_depth = 64;
- row_info->rowbytes = row_width * 4;
+ row_info->rowbytes = row_width * 8;
}
/* This changes the data from RRGGBB to XXRRGGBB */
else
}
row_info->channels = 4;
row_info->pixel_depth = 64;
- row_info->rowbytes = row_width * 4;
+ row_info->rowbytes = row_width * 8;
}
}
} /* COLOR_TYPE == RGB */
#if defined(PNG_READ_GRAY_TO_RGB_SUPPORTED)
/* expand grayscale files to RGB, with or without alpha */
-void
+void /* PRIVATE */
png_do_gray_to_rgb(png_row_infop row_info, png_bytep row)
{
png_uint_32 i;
{
*(dp--) = *sp;
*(dp--) = *sp;
- *(dp--) = *sp;
- sp--;
+ *(dp--) = *(sp--);
}
}
else
*(dp--) = *(sp - 1);
*(dp--) = *sp;
*(dp--) = *(sp - 1);
- *(dp--) = *sp;
- *(dp--) = *(sp - 1);
- sp--;
- sp--;
+ *(dp--) = *(sp--);
+ *(dp--) = *(sp--);
}
}
}
*(dp--) = *(sp--);
*(dp--) = *sp;
*(dp--) = *sp;
- *(dp--) = *sp;
- sp--;
+ *(dp--) = *(sp--);
}
}
else
*(dp--) = *(sp - 1);
*(dp--) = *sp;
*(dp--) = *(sp - 1);
- *(dp--) = *sp;
- *(dp--) = *(sp - 1);
- sp--;
- sp--;
+ *(dp--) = *(sp--);
+ *(dp--) = *(sp--);
}
}
}
#endif
#if defined(PNG_READ_RGB_TO_GRAY_SUPPORTED)
-/* reduce RGB files to grayscale, with or without alpha
+/* reduce RGB files to grayscale, with or without alpha
* using the equation given in Poynton's ColorFAQ at
* <http://www.inforamp.net/~poynton/>
* Copyright (c) 1998-01-04 Charles Poynton poynton@inforamp.net
* Y = 0.212671 * R + 0.715160 * G + 0.072169 * B
*
* We approximate this with
- *
- * Y = 0.211 * R + 0.715 * G + 0.074 * B
+ *
+ * Y = 0.21268 * R + 0.7151 * G + 0.07217 * B
*
* which can be expressed with integers as
*
- * Y = (54 * R + 183 * G + 19 * B)/256
+ * Y = (6969 * R + 23434 * G + 2365 * B)/32768
*
* The calculation is to be done in a linear colorspace.
*
* Other integer coefficents can be used via png_set_rgb_to_gray().
*/
-int
+int /* PRIVATE */
png_do_rgb_to_gray(png_structp png_ptr, png_row_infop row_info, png_bytep row)
{
#endif
(row_info->color_type & PNG_COLOR_MASK_COLOR))
{
- png_byte rc = png_ptr->rgb_to_gray_red_coeff;
- png_byte gc = png_ptr->rgb_to_gray_green_coeff;
- png_byte bc = png_ptr->rgb_to_gray_blue_coeff;
+ png_uint_32 rc = png_ptr->rgb_to_gray_red_coeff;
+ png_uint_32 gc = png_ptr->rgb_to_gray_green_coeff;
+ png_uint_32 bc = png_ptr->rgb_to_gray_blue_coeff;
if (row_info->color_type == PNG_COLOR_TYPE_RGB)
{
{
rgb_error |= 1;
*(dp++) = png_ptr->gamma_from_1[
- (rc*red+gc*green+bc*blue)>>8];
+ (rc*red+gc*green+bc*blue)>>15];
}
else
*(dp++) = *(sp-1);
if(red != green || red != blue)
{
rgb_error |= 1;
- *(dp++) = (rc*red+gc*green+bc*blue)>>8;
+ *(dp++) = (png_byte)((rc*red+gc*green+bc*blue)>>15);
}
else
*(dp++) = *(sp-1);
}
}
}
-
+
else /* RGB bit_depth == 16 */
{
#if defined(PNG_READ_GAMMA_SUPPORTED) || defined(PNG_READ_BACKGROUND_SUPPORTED)
{
png_uint_16 red, green, blue, w;
- red = ((*(sp))<<8) | *(sp+1); sp+=2;
- green = ((*(sp))<<8) | *(sp+1); sp+=2;
- blue = ((*(sp))<<8) | *(sp+1); sp+=2;
+ red = (png_uint_16)(((*(sp))<<8) | *(sp+1)); sp+=2;
+ green = (png_uint_16)(((*(sp))<<8) | *(sp+1)); sp+=2;
+ blue = (png_uint_16)(((*(sp))<<8) | *(sp+1)); sp+=2;
if(red == green && red == blue)
w = red;
png_ptr->gamma_shift][red>>8];
png_uint_16 green_1 = png_ptr->gamma_16_to_1[(green&0xff) >>
png_ptr->gamma_shift][green>>8];
- png_uint_16 blue_1 = png_ptr->gamma_16_to_1[(blue&0xff) >>
+ png_uint_16 blue_1 = png_ptr->gamma_16_to_1[(blue&0xff) >>
png_ptr->gamma_shift][blue>>8];
- png_uint_16 gray16 = (rc * red_1 + gc * green_1
- + bc * blue_1)>>8;
+ png_uint_16 gray16 = (png_uint_16)((rc*red_1 + gc*green_1
+ + bc*blue_1)>>15);
w = png_ptr->gamma_16_from_1[(gray16&0xff) >>
png_ptr->gamma_shift][gray16 >> 8];
rgb_error |= 1;
}
-
- *(dp++) = (w>>8) & 0xff;
- *(dp++) = w & 0xff;
+
+ *(dp++) = (png_byte)((w>>8) & 0xff);
+ *(dp++) = (png_byte)(w & 0xff);
}
}
else
{
png_uint_16 red, green, blue, gray16;
- red = ((*(sp))<<8) | *(sp+1); sp+=2;
- green = ((*(sp))<<8) | *(sp+1); sp+=2;
- blue = ((*(sp))<<8) | *(sp+1); sp+=2;
+ red = (png_uint_16)(((*(sp))<<8) | *(sp+1)); sp+=2;
+ green = (png_uint_16)(((*(sp))<<8) | *(sp+1)); sp+=2;
+ blue = (png_uint_16)(((*(sp))<<8) | *(sp+1)); sp+=2;
if(red != green || red != blue)
rgb_error |= 1;
- gray16 = (rc * red + gc * green + bc * blue)>>8;
- *(dp++) = (gray16>>8) & 0xff;
- *(dp++) = gray16 & 0xff;
+ gray16 = (png_uint_16)((rc*red + gc*green + bc*blue)>>15);
+ *(dp++) = (png_byte)((gray16>>8) & 0xff);
+ *(dp++) = (png_byte)(gray16 & 0xff);
}
}
}
if(red != green || red != blue)
rgb_error |= 1;
*(dp++) = png_ptr->gamma_from_1
- [(rc*red + gc*green + bc*blue)>>8];
+ [(rc*red + gc*green + bc*blue)>>15];
*(dp++) = *(sp++); /* alpha */
}
}
png_byte blue = *(sp++);
if(red != green || red != blue)
rgb_error |= 1;
- *(dp++) = (gc*red + gc*green + bc*blue)>>8;
+ *(dp++) = (png_byte)((gc*red + gc*green + bc*blue)>>8);
*(dp++) = *(sp++); /* alpha */
}
}
{
png_uint_16 red, green, blue, w;
- red = ((*(sp))<<8) | *(sp+1); sp+=2;
- green = ((*(sp))<<8) | *(sp+1); sp+=2;
- blue = ((*(sp))<<8) | *(sp+1); sp+=2;
+ red = (png_uint_16)(((*(sp))<<8) | *(sp+1)); sp+=2;
+ green = (png_uint_16)(((*(sp))<<8) | *(sp+1)); sp+=2;
+ blue = (png_uint_16)(((*(sp))<<8) | *(sp+1)); sp+=2;
if(red == green && red == blue)
w = red;
png_ptr->gamma_shift][red>>8];
png_uint_16 green_1 = png_ptr->gamma_16_to_1[(green&0xff) >>
png_ptr->gamma_shift][green>>8];
- png_uint_16 blue_1 = png_ptr->gamma_16_to_1[(blue&0xff) >>
+ png_uint_16 blue_1 = png_ptr->gamma_16_to_1[(blue&0xff) >>
png_ptr->gamma_shift][blue>>8];
- png_uint_16 gray16 = (rc * red_1 + gc * green_1
- + bc * blue_1)>>8;
+ png_uint_16 gray16 = (png_uint_16)((rc * red_1
+ + gc * green_1 + bc * blue_1)>>15);
w = png_ptr->gamma_16_from_1[(gray16&0xff) >>
png_ptr->gamma_shift][gray16 >> 8];
rgb_error |= 1;
}
-
- *(dp++) = (w>>8) & 0xff;
- *(dp++) = w & 0xff;
+
+ *(dp++) = (png_byte)((w>>8) & 0xff);
+ *(dp++) = (png_byte)(w & 0xff);
*(dp++) = *(sp++); /* alpha */
*(dp++) = *(sp++);
}
for (i = 0; i < row_width; i++)
{
png_uint_16 red, green, blue, gray16;
- red = (*(sp)<<8) | *(sp+1); sp+=2;
- green = (*(sp)<<8) | *(sp+1); sp+=2;
- blue = (*(sp)<<8) | *(sp+1); sp+=2;
+ red = (png_uint_16)((*(sp)<<8) | *(sp+1)); sp+=2;
+ green = (png_uint_16)((*(sp)<<8) | *(sp+1)); sp+=2;
+ blue = (png_uint_16)((*(sp)<<8) | *(sp+1)); sp+=2;
if(red != green || red != blue)
rgb_error |= 1;
- gray16 = (rc * red + gc * green + bc * blue)>>8;
- *(dp++) = (gray16>>8) & 0xff;
- *(dp++) = gray16 & 0xff;
+ gray16 = (png_uint_16)((rc*red + gc*green + bc*blue)>>15);
+ *(dp++) = (png_byte)((gray16>>8) & 0xff);
+ *(dp++) = (png_byte)(gray16 & 0xff);
*(dp++) = *(sp++); /* alpha */
*(dp++) = *(sp++);
}
* paletted. Most useful for gamma correction and simplification
* of code.
*/
-void
+void PNGAPI
png_build_grayscale_palette(int bit_depth, png_colorp palette)
{
int num_palette;
/* This function is currently unused. Do we really need it? */
#if defined(PNG_READ_DITHER_SUPPORTED) && defined(PNG_CORRECT_PALETTE_SUPPORTED)
-void
+void /* PRIVATE */
png_correct_palette(png_structp png_ptr, png_colorp palette,
int num_palette)
{
png_debug(1, "in png_correct_palette\n");
-#if defined(PNG_READ_BACKGROUND_SUPPORTED) && defined(PNG_READ_GAMMA_SUPPORTED)
+#if defined(PNG_READ_BACKGROUND_SUPPORTED) && \
+ defined(PNG_READ_GAMMA_SUPPORTED) && defined(PNG_FLOATING_POINT_SUPPORTED)
if (png_ptr->transformations & (PNG_GAMMA | PNG_BACKGROUND))
{
png_color back, back_1;
* "background" is already in the screen gamma, while "background_1" is
* at a gamma of 1.0. Paletted files have already been taken care of.
*/
-void
+void /* PRIVATE */
png_do_background(png_row_infop row_info, png_bytep row,
- png_color_16p trans_values, png_color_16p background,
- png_color_16p background_1,
+ png_color_16p trans_values, png_color_16p background
+#if defined(PNG_READ_GAMMA_SUPPORTED)
+ , png_color_16p background_1,
png_bytep gamma_table, png_bytep gamma_from_1, png_bytep gamma_to_1,
png_uint_16pp gamma_16, png_uint_16pp gamma_16_from_1,
- png_uint_16pp gamma_16_to_1, int gamma_shift)
+ png_uint_16pp gamma_16_to_1, int gamma_shift
+#endif
+ )
{
png_bytep sp, dp;
png_uint_32 i;
shift = 7;
for (i = 0; i < row_width; i++)
{
- if ((png_uint_16)((*sp >> shift) & 0x1)
+ if ((png_uint_16)((*sp >> shift) & 0x01)
== trans_values->gray)
{
*sp &= (png_byte)((0x7f7f >> (7 - shift)) & 0xff);
shift = 6;
for (i = 0; i < row_width; i++)
{
- if ((png_uint_16)((*sp >> shift) & 0x3)
+ if ((png_uint_16)((*sp >> shift) & 0x03)
== trans_values->gray)
{
*sp &= (png_byte)((0x3f3f >> (6 - shift)) & 0xff);
}
else
{
- png_byte p = (*sp >> shift) & 0x3;
- png_byte g = (gamma_table [p | (p << 2) | (p << 4) |
- (p << 6)] >> 6) & 0x3;
+ png_byte p = (png_byte)((*sp >> shift) & 0x03);
+ png_byte g = (png_byte)((gamma_table [p | (p << 2) |
+ (p << 4) | (p << 6)] >> 6) & 0x03);
*sp &= (png_byte)((0x3f3f >> (6 - shift)) & 0xff);
*sp |= (png_byte)(g << shift);
}
shift = 6;
for (i = 0; i < row_width; i++)
{
- if ((png_uint_16)((*sp >> shift) & 0x3)
+ if ((png_uint_16)((*sp >> shift) & 0x03)
== trans_values->gray)
{
*sp &= (png_byte)((0x3f3f >> (6 - shift)) & 0xff);
shift = 4;
for (i = 0; i < row_width; i++)
{
- if ((png_uint_16)((*sp >> shift) & 0xf)
+ if ((png_uint_16)((*sp >> shift) & 0x0f)
== trans_values->gray)
{
*sp &= (png_byte)((0xf0f >> (4 - shift)) & 0xff);
}
else
{
- png_byte p = (*sp >> shift) & 0xf;
- png_byte g = (gamma_table[p | (p << 4)] >> 4) & 0xf;
+ png_byte p = (png_byte)((*sp >> shift) & 0x0f);
+ png_byte g = (png_byte)((gamma_table[p |
+ (p << 4)] >> 4) & 0x0f);
*sp &= (png_byte)((0xf0f >> (4 - shift)) & 0xff);
*sp |= (png_byte)(g << shift);
}
shift = 4;
for (i = 0; i < row_width; i++)
{
- if ((png_uint_16)((*sp >> shift) & 0xf)
+ if ((png_uint_16)((*sp >> shift) & 0x0f)
== trans_values->gray)
{
*sp &= (png_byte)((0xf0f >> (4 - shift)) & 0xff);
{
png_uint_16 v;
- v = ((png_uint_16)(*sp) << 8) + *(sp + 1);
+ v = (png_uint_16)(((*sp) << 8) + *(sp + 1));
if (v == trans_values->gray)
{
/* background is already in screen gamma */
{
png_uint_16 v;
- v = ((png_uint_16)(*sp) << 8) + *(sp + 1);
+ v = (png_uint_16)(((*sp) << 8) + *(sp + 1));
if (v == trans_values->gray)
{
*sp = (png_byte)((background->gray >> 8) & 0xff);
sp = row;
for (i = 0; i < row_width; i++, sp += 6)
{
- png_uint_16 r = ((png_uint_16)(*sp) << 8) + *(sp + 1);
- png_uint_16 g = ((png_uint_16)(*(sp + 2)) << 8) + *(sp + 3);
- png_uint_16 b = ((png_uint_16)(*(sp + 4)) << 8) + *(sp + 5);
+ png_uint_16 r = (png_uint_16)(((*sp) << 8) + *(sp + 1));
+ png_uint_16 g = (png_uint_16)(((*(sp+2)) << 8) + *(sp+3));
+ png_uint_16 b = (png_uint_16)(((*(sp+4)) << 8) + *(sp+5));
if (r == trans_values->red && g == trans_values->green &&
b == trans_values->blue)
{
sp = row;
for (i = 0; i < row_width; i++, sp += 6)
{
- png_uint_16 r = ((png_uint_16)(*sp) << 8) + *(sp + 1);
- png_uint_16 g = ((png_uint_16)(*(sp + 2)) << 8) + *(sp + 3);
- png_uint_16 b = ((png_uint_16)(*(sp + 4)) << 8) + *(sp + 5);
+ png_uint_16 r = (png_uint_16)(((*sp) << 8) + *(sp+1));
+ png_uint_16 g = (png_uint_16)(((*(sp+2)) << 8) + *(sp+3));
+ png_uint_16 b = (png_uint_16)(((*(sp+4)) << 8) + *(sp+5));
if (r == trans_values->red && g == trans_values->green &&
b == trans_values->blue)
{
*dp = *sp;
}
+#if defined(PNG_READ_GAMMA_SUPPORTED)
else if (a == 0)
{
*dp = (png_byte)background->gray;
{
png_composite(*dp, *sp, a, background_1->gray);
}
+#else
+ *dp = (png_byte)background->gray;
+#endif
}
}
}
dp = row;
for (i = 0; i < row_width; i++, sp += 4, dp += 2)
{
- png_uint_16 a = ((png_uint_16)(*(sp + 2)) << 8) + *(sp + 3);
+ png_uint_16 a = (png_uint_16)(((*(sp+2)) << 8) + *(sp+3));
if (a == (png_uint_16)0xffff)
{
*dp = (png_byte)((v >> 8) & 0xff);
*(dp + 1) = (png_byte)(v & 0xff);
}
+#if defined(PNG_READ_GAMMA_SUPPORTED)
else if (a == 0)
+#else
+ else
+#endif
{
/* background is already in screen gamma */
*dp = (png_byte)((background->gray >> 8) & 0xff);
*(dp + 1) = (png_byte)(background->gray & 0xff);
}
+#if defined(PNG_READ_GAMMA_SUPPORTED)
else
{
png_uint_16 g, v, w;
*dp = (png_byte)((w >> 8) & 0xff);
*(dp + 1) = (png_byte)(w & 0xff);
}
+#endif
}
}
else
dp = row;
for (i = 0; i < row_width; i++, sp += 4, dp += 2)
{
- png_uint_16 a = ((png_uint_16)(*(sp + 2)) << 8) + *(sp + 3);
+ png_uint_16 a = (png_uint_16)(((*(sp+2)) << 8) + *(sp+3));
if (a == (png_uint_16)0xffff)
{
png_memcpy(dp, sp, 2);
}
+#if defined(PNG_READ_GAMMA_SUPPORTED)
else if (a == 0)
+#else
+ else
+#endif
{
*dp = (png_byte)((background->gray >> 8) & 0xff);
*(dp + 1) = (png_byte)(background->gray & 0xff);
}
+#if defined(PNG_READ_GAMMA_SUPPORTED)
else
{
png_uint_16 g, v;
- g = ((png_uint_16)(*sp) << 8) + *(sp + 1);
+ g = (png_uint_16)(((*sp) << 8) + *(sp + 1));
png_composite_16(v, g, a, background_1->gray);
*dp = (png_byte)((v >> 8) & 0xff);
*(dp + 1) = (png_byte)(v & 0xff);
}
+#endif
}
}
}
png_uint_16 v, w, x;
v = gamma_16_to_1[*(sp + 1) >> gamma_shift][*sp];
- png_composite_16(w, v, a, background->red);
+ png_composite_16(w, v, a, background_1->red);
x = gamma_16_from_1[((w&0xff) >> gamma_shift)][w >> 8];
*dp = (png_byte)((x >> 8) & 0xff);
*(dp + 1) = (png_byte)(x & 0xff);
v = gamma_16_to_1[*(sp + 3) >> gamma_shift][*(sp + 2)];
- png_composite_16(w, v, a, background->green);
+ png_composite_16(w, v, a, background_1->green);
x = gamma_16_from_1[((w&0xff) >> gamma_shift)][w >> 8];
*(dp + 2) = (png_byte)((x >> 8) & 0xff);
*(dp + 3) = (png_byte)(x & 0xff);
v = gamma_16_to_1[*(sp + 5) >> gamma_shift][*(sp + 4)];
- png_composite_16(w, v, a, background->blue);
+ png_composite_16(w, v, a, background_1->blue);
x = gamma_16_from_1[(w & 0xff) >> gamma_shift][w >> 8];
*(dp + 4) = (png_byte)((x >> 8) & 0xff);
*(dp + 5) = (png_byte)(x & 0xff);
{
png_uint_16 v;
- png_uint_16 r = ((png_uint_16)(*sp) << 8) + *(sp + 1);
- png_uint_16 g = ((png_uint_16)(*(sp + 2)) << 8)
- + *(sp + 3);
- png_uint_16 b = ((png_uint_16)(*(sp + 4)) << 8)
- + *(sp + 5);
+ png_uint_16 r = (png_uint_16)(((*sp) << 8) + *(sp + 1));
+ png_uint_16 g = (png_uint_16)(((*(sp + 2)) << 8)
+ + *(sp + 3));
+ png_uint_16 b = (png_uint_16)(((*(sp + 4)) << 8)
+ + *(sp + 5));
png_composite_16(v, r, a, background->red);
*dp = (png_byte)((v >> 8) & 0xff);
#if defined(PNG_READ_GAMMA_SUPPORTED)
/* Gamma correct the image, avoiding the alpha channel. Make sure
* you do this after you deal with the transparency issue on grayscale
- * or rgb images. If your bit depth is 8, use gamma_table, if it
+ * or RGB images. If your bit depth is 8, use gamma_table, if it
* is 16, use gamma_16_table and gamma_shift. Build these with
* build_gamma_table().
*/
-void
+void /* PRIVATE */
png_do_gamma(png_row_infop row_info, png_bytep row,
png_bytep gamma_table, png_uint_16pp gamma_16_table,
int gamma_shift)
int c = *sp & 0x0c;
int d = *sp & 0x03;
- *sp = ((((int)gamma_table[a|(a>>2)|(a>>4)|(a>>6)]) ) & 0xc0)|
+ *sp = (png_byte)(
+ ((((int)gamma_table[a|(a>>2)|(a>>4)|(a>>6)]) ) & 0xc0)|
((((int)gamma_table[(b<<2)|b|(b>>2)|(b>>4)])>>2) & 0x30)|
((((int)gamma_table[(c<<4)|(c<<2)|c|(c>>2)])>>4) & 0x0c)|
- ((((int)gamma_table[(d<<6)|(d<<4)|(d<<2)|d])>>6) );
+ ((((int)gamma_table[(d<<6)|(d<<4)|(d<<2)|d])>>6) ));
sp++;
}
}
int msb = *sp & 0xf0;
int lsb = *sp & 0x0f;
- *sp = (((int)gamma_table[msb | (msb >> 4)]) & 0xf0) |
- (((int)gamma_table[(lsb << 4) | lsb]) >> 4);
+ *sp = (png_byte)((((int)gamma_table[msb | (msb >> 4)]) & 0xf0)
+ | (((int)gamma_table[(lsb << 4) | lsb]) >> 4));
sp++;
}
}
#endif
#if defined(PNG_READ_EXPAND_SUPPORTED)
-/* Expands a palette row to an rgb or rgba row depending
+/* Expands a palette row to an RGB or RGBA row depending
* upon whether you supply trans and num_trans.
*/
-void
+void /* PRIVATE */
png_do_expand_palette(png_row_infop row_info, png_bytep row,
png_colorp palette, png_bytep trans, int num_trans)
{
{
sp = row + (png_size_t)((row_width - 1) >> 3);
dp = row + (png_size_t)row_width - 1;
- shift = 7 - (int)((row_width + 7) & 7);
+ shift = 7 - (int)((row_width + 7) & 0x07);
for (i = 0; i < row_width; i++)
{
- if ((*sp >> shift) & 0x1)
+ if ((*sp >> shift) & 0x01)
*dp = 1;
else
*dp = 0;
{
sp = row + (png_size_t)((row_width - 1) >> 2);
dp = row + (png_size_t)row_width - 1;
- shift = (int)((3 - ((row_width + 3) & 3)) << 1);
+ shift = (int)((3 - ((row_width + 3) & 0x03)) << 1);
for (i = 0; i < row_width; i++)
{
- value = (*sp >> shift) & 0x3;
+ value = (*sp >> shift) & 0x03;
*dp = (png_byte)value;
if (shift == 6)
{
{
sp = row + (png_size_t)((row_width - 1) >> 1);
dp = row + (png_size_t)row_width - 1;
- shift = (int)((row_width & 1) << 2);
+ shift = (int)((row_width & 0x01) << 2);
for (i = 0; i < row_width; i++)
{
- value = (*sp >> shift) & 0xf;
+ value = (*sp >> shift) & 0x0f;
*dp = (png_byte)value;
if (shift == 4)
{
/* If the bit depth < 8, it is expanded to 8. Also, if the
* transparency value is supplied, an alpha channel is built.
*/
-void
+void /* PRIVATE */
png_do_expand(png_row_infop row_info, png_bytep row,
png_color_16p trans_value)
{
{
if (row_info->color_type == PNG_COLOR_TYPE_GRAY)
{
- png_uint_16 gray = trans_value ? trans_value->gray : 0;
+ png_uint_16 gray = (png_uint_16)(trans_value ? trans_value->gray : 0);
if (row_info->bit_depth < 8)
{
{
case 1:
{
- gray *= 0xff;
+ gray = (png_uint_16)(gray*0xff);
sp = row + (png_size_t)((row_width - 1) >> 3);
dp = row + (png_size_t)row_width - 1;
- shift = 7 - (int)((row_width + 7) & 7);
+ shift = 7 - (int)((row_width + 7) & 0x07);
for (i = 0; i < row_width; i++)
{
- if ((*sp >> shift) & 0x1)
+ if ((*sp >> shift) & 0x01)
*dp = 0xff;
else
*dp = 0;
}
case 2:
{
- gray *= 0x55;
+ gray = (png_uint_16)(gray*0x55);
sp = row + (png_size_t)((row_width - 1) >> 2);
dp = row + (png_size_t)row_width - 1;
- shift = (int)((3 - ((row_width + 3) & 3)) << 1);
+ shift = (int)((3 - ((row_width + 3) & 0x03)) << 1);
for (i = 0; i < row_width; i++)
{
- value = (*sp >> shift) & 0x3;
+ value = (*sp >> shift) & 0x03;
*dp = (png_byte)(value | (value << 2) | (value << 4) |
(value << 6));
if (shift == 6)
}
case 4:
{
- gray *= 0x11;
+ gray = (png_uint_16)(gray*0x11);
sp = row + (png_size_t)((row_width - 1) >> 1);
dp = row + (png_size_t)row_width - 1;
- shift = (int)((1 - ((row_width + 1) & 1)) << 2);
+ shift = (int)((1 - ((row_width + 1) & 0x01)) << 2);
for (i = 0; i < row_width; i++)
{
- value = (*sp >> shift) & 0xf;
+ value = (*sp >> shift) & 0x0f;
*dp = (png_byte)(value | (value << 4));
if (shift == 4)
{
#endif
#if defined(PNG_READ_DITHER_SUPPORTED)
-void
+void /* PRIVATE */
png_do_dither(png_row_infop row_info, png_bytep row,
png_bytep palette_lookup, png_bytep dither_lookup)
{
}
#endif
+#ifdef PNG_FLOATING_POINT_SUPPORTED
#if defined(PNG_READ_GAMMA_SUPPORTED)
static int png_gamma_shift[] =
{0x10, 0x21, 0x42, 0x84, 0x110, 0x248, 0x550, 0xff0};
* the future. Note also how the gamma_16 tables are segmented so that
* we don't need to allocate > 64K chunks for a full 16-bit table.
*/
-void
+void /* PRIVATE */
png_build_gamma_table(png_structp png_ptr)
{
png_debug(1, "in png_build_gamma_table\n");
#if defined(PNG_READ_BACKGROUND_SUPPORTED) || \
defined(PNG_READ_RGB_TO_GRAY_SUPPORTED)
- if (png_ptr->transformations & (PNG_BACKGROUND | PNG_RGB_TO_GRAY))
+ if (png_ptr->transformations & ((PNG_BACKGROUND) | PNG_RGB_TO_GRAY))
{
g = 1.0 / (png_ptr->gamma);
g) * 255.0 + .5);
}
-
+
png_ptr->gamma_from_1 = (png_bytep)png_malloc(png_ptr,
(png_uint_32)256);
}
}
#endif
+/* To do: install integer version of png_build_gamma_table here */
+#endif
+
+#if defined(PNG_MNG_FEATURES_SUPPORTED)
+/* undoes intrapixel differencing */
+void /* PRIVATE */
+png_do_read_intrapixel(png_row_infop row_info, png_bytep row)
+{
+ png_debug(1, "in png_do_read_intrapixel\n");
+ if (
+#if defined(PNG_USELESS_TESTS_SUPPORTED)
+ row != NULL && row_info != NULL &&
+#endif
+ (row_info->color_type & PNG_COLOR_MASK_COLOR))
+ {
+ int bytes_per_pixel;
+ png_uint_32 row_width = row_info->width;
+ if (row_info->bit_depth == 8)
+ {
+ png_bytep rp;
+ png_uint_32 i;
+
+ if (row_info->color_type == PNG_COLOR_TYPE_RGB)
+ bytes_per_pixel = 3;
+ else if (row_info->color_type == PNG_COLOR_TYPE_RGB_ALPHA)
+ bytes_per_pixel = 4;
+ else
+ return;
+
+ for (i = 0, rp = row; i < row_width; i++, rp += bytes_per_pixel)
+ {
+ *(rp) = (png_byte)((256 + *rp + *(rp+1))&0xff);
+ *(rp+2) = (png_byte)((256 + *(rp+2) + *(rp+1))&0xff);
+ }
+ }
+ else if (row_info->bit_depth == 16)
+ {
+ png_bytep rp;
+ png_uint_32 i;
+ if (row_info->color_type == PNG_COLOR_TYPE_RGB)
+ bytes_per_pixel = 6;
+ else if (row_info->color_type == PNG_COLOR_TYPE_RGB_ALPHA)
+ bytes_per_pixel = 8;
+ else
+ return;
+
+ for (i = 0, rp = row; i < row_width; i++, rp += bytes_per_pixel)
+ {
+ png_uint_32 s0=*(rp )<<8 | *(rp+1);
+ png_uint_32 s1=*(rp+2)<<8 | *(rp+3);
+ png_uint_32 s2=*(rp+4)<<8 | *(rp+5);
+ png_uint_32 red=(65536+s0+s1)&0xffff;
+ png_uint_32 blue=(65536+s2+s1)&0xffff;
+ *(rp ) = (png_byte)((red>>8)&0xff);
+ *(rp+1) = (png_byte)(red&0xff);
+ *(rp+4) = (png_byte)((blue>>8)&0xff);
+ *(rp+5) = (png_byte)(blue&0xff);
+ }
+ }
+ }
+}
+#endif /* PNG_MNG_FEATURES_SUPPORTED */
/* pngrutil.c - utilities to read a PNG file
*
- * libpng 1.0.3 - January 14, 1999
+ * libpng 1.2.4 - July 8, 2002
* For conditions of distribution and use, see copyright notice in png.h
- * Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.
- * Copyright (c) 1996, 1997 Andreas Dilger
- * Copyright (c) 1998, 1999 Glenn Randers-Pehrson
+ * Copyright (c) 1998-2002 Glenn Randers-Pehrson
+ * (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger)
+ * (Version 0.88 Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.)
*
* This file contains routines that are only called from within
* libpng itself during the course of reading an image.
#define PNG_INTERNAL
#include "png.h"
+#if defined(_WIN32_WCE)
+/* strtod() function is not supported on WindowsCE */
+# ifdef PNG_FLOATING_POINT_SUPPORTED
+__inline double strtod(const char *nptr, char **endptr)
+{
+ double result = 0;
+ int len;
+ wchar_t *str, *end;
+
+ len = MultiByteToWideChar(CP_ACP, 0, nptr, -1, NULL, 0);
+ str = (wchar_t *)malloc(len * sizeof(wchar_t));
+ if ( NULL != str )
+ {
+ MultiByteToWideChar(CP_ACP, 0, nptr, -1, str, len);
+ result = wcstod(str, &end);
+ len = WideCharToMultiByte(CP_ACP, 0, end, -1, NULL, 0, NULL, NULL);
+ *endptr = (char *)nptr + (png_strlen(nptr) - len + 1);
+ free(str);
+ }
+ return result;
+}
+# endif
+#endif
+
#ifndef PNG_READ_BIG_ENDIAN_SUPPORTED
/* Grab an unsigned 32-bit integer from a buffer in big-endian format. */
-png_uint_32
+png_uint_32 /* PRIVATE */
png_get_uint_32(png_bytep buf)
{
png_uint_32 i = ((png_uint_32)(*buf) << 24) +
return (i);
}
-#if defined(PNG_READ_pCAL_SUPPORTED)
+#if defined(PNG_READ_pCAL_SUPPORTED) || defined(PNG_READ_oFFs_SUPPORTED)
/* Grab a signed 32-bit integer from a buffer in big-endian format. The
* data is stored in the PNG file in two's complement format, and it is
* assumed that the machine format for signed integers is the same. */
-png_int_32
+png_int_32 /* PRIVATE */
png_get_int_32(png_bytep buf)
{
png_int_32 i = ((png_int_32)(*buf) << 24) +
#endif /* PNG_READ_pCAL_SUPPORTED */
/* Grab an unsigned 16-bit integer from a buffer in big-endian format. */
-png_uint_16
+png_uint_16 /* PRIVATE */
png_get_uint_16(png_bytep buf)
{
png_uint_16 i = (png_uint_16)(((png_uint_16)(*buf) << 8) +
#endif /* PNG_READ_BIG_ENDIAN_SUPPORTED */
/* Read data, and (optionally) run it through the CRC. */
-void
+void /* PRIVATE */
png_crc_read(png_structp png_ptr, png_bytep buf, png_size_t length)
{
png_read_data(png_ptr, buf, length);
are reading a ancillary or critical chunk, and how the program has set
things up, we may calculate the CRC on the data and print a message.
Returns '1' if there was a CRC error, '0' otherwise. */
-int
+int /* PRIVATE */
png_crc_finish(png_structp png_ptr, png_uint_32 skip)
{
png_size_t i;
if (png_crc_error(png_ptr))
{
- if ((png_ptr->chunk_name[0] & 0x20 && /* Ancillary */
+ if (((png_ptr->chunk_name[0] & 0x20) && /* Ancillary */
!(png_ptr->flags & PNG_FLAG_CRC_ANCILLARY_NOWARN)) ||
(!(png_ptr->chunk_name[0] & 0x20) && /* Critical */
- png_ptr->flags & PNG_FLAG_CRC_CRITICAL_USE))
+ (png_ptr->flags & PNG_FLAG_CRC_CRITICAL_USE)))
{
png_chunk_warning(png_ptr, "CRC error");
}
/* Compare the CRC stored in the PNG file with that calculated by libpng from
the data it has read thus far. */
-int
+int /* PRIVATE */
png_crc_error(png_structp png_ptr)
{
png_byte crc_bytes[4];
return (0);
}
+#if defined(PNG_READ_zTXt_SUPPORTED) || defined(PNG_READ_iTXt_SUPPORTED) || \
+ defined(PNG_READ_iCCP_SUPPORTED)
+/*
+ * Decompress trailing data in a chunk. The assumption is that chunkdata
+ * points at an allocated area holding the contents of a chunk with a
+ * trailing compressed part. What we get back is an allocated area
+ * holding the original prefix part and an uncompressed version of the
+ * trailing part (the malloc area passed in is freed).
+ */
+png_charp /* PRIVATE */
+png_decompress_chunk(png_structp png_ptr, int comp_type,
+ png_charp chunkdata, png_size_t chunklength,
+ png_size_t prefix_size, png_size_t *newlength)
+{
+ static char msg[] = "Error decoding compressed text";
+ png_charp text = NULL;
+ png_size_t text_size;
+
+ if (comp_type == PNG_COMPRESSION_TYPE_BASE)
+ {
+ int ret = Z_OK;
+ png_ptr->zstream.next_in = (png_bytep)(chunkdata + prefix_size);
+ png_ptr->zstream.avail_in = (uInt)(chunklength - prefix_size);
+ png_ptr->zstream.next_out = png_ptr->zbuf;
+ png_ptr->zstream.avail_out = (uInt)png_ptr->zbuf_size;
+
+ text_size = 0;
+ text = NULL;
+
+ while (png_ptr->zstream.avail_in)
+ {
+ ret = inflate(&png_ptr->zstream, Z_PARTIAL_FLUSH);
+ if (ret != Z_OK && ret != Z_STREAM_END)
+ {
+ if (png_ptr->zstream.msg != NULL)
+ png_warning(png_ptr, png_ptr->zstream.msg);
+ else
+ png_warning(png_ptr, msg);
+ inflateReset(&png_ptr->zstream);
+ png_ptr->zstream.avail_in = 0;
+
+ if (text == NULL)
+ {
+ text_size = prefix_size + sizeof(msg) + 1;
+ text = (png_charp)png_malloc_warn(png_ptr, text_size);
+ if (text == NULL)
+ {
+ png_free(png_ptr,chunkdata);
+ png_error(png_ptr,"Not enough memory to decompress chunk");
+ }
+ png_memcpy(text, chunkdata, prefix_size);
+ }
+
+ text[text_size - 1] = 0x00;
+
+ /* Copy what we can of the error message into the text chunk */
+ text_size = (png_size_t)(chunklength - (text - chunkdata) - 1);
+ text_size = sizeof(msg) > text_size ? text_size : sizeof(msg);
+ png_memcpy(text + prefix_size, msg, text_size + 1);
+ break;
+ }
+ if (!png_ptr->zstream.avail_out || ret == Z_STREAM_END)
+ {
+ if (text == NULL)
+ {
+ text_size = prefix_size +
+ png_ptr->zbuf_size - png_ptr->zstream.avail_out;
+ text = (png_charp)png_malloc_warn(png_ptr, text_size + 1);
+ if (text == NULL)
+ {
+ png_free(png_ptr,chunkdata);
+ png_error(png_ptr,"Not enough memory to decompress chunk.");
+ }
+ png_memcpy(text + prefix_size, png_ptr->zbuf,
+ text_size - prefix_size);
+ png_memcpy(text, chunkdata, prefix_size);
+ *(text + text_size) = 0x00;
+ }
+ else
+ {
+ png_charp tmp;
+
+ tmp = text;
+ text = (png_charp)png_malloc_warn(png_ptr,
+ (png_uint_32)(text_size +
+ png_ptr->zbuf_size - png_ptr->zstream.avail_out + 1));
+ if (text == NULL)
+ {
+ png_free(png_ptr, tmp);
+ png_free(png_ptr, chunkdata);
+ png_error(png_ptr,"Not enough memory to decompress chunk..");
+ }
+ png_memcpy(text, tmp, text_size);
+ png_free(png_ptr, tmp);
+ png_memcpy(text + text_size, png_ptr->zbuf,
+ (png_ptr->zbuf_size - png_ptr->zstream.avail_out));
+ text_size += png_ptr->zbuf_size - png_ptr->zstream.avail_out;
+ *(text + text_size) = 0x00;
+ }
+ if (ret == Z_STREAM_END)
+ break;
+ else
+ {
+ png_ptr->zstream.next_out = png_ptr->zbuf;
+ png_ptr->zstream.avail_out = (uInt)png_ptr->zbuf_size;
+ }
+ }
+ }
+ if (ret != Z_STREAM_END)
+ {
+#if !defined(PNG_NO_STDIO) && !defined(_WIN32_WCE)
+ char umsg[50];
+
+ if (ret == Z_BUF_ERROR)
+ sprintf(umsg,"Buffer error in compressed datastream in %s chunk",
+ png_ptr->chunk_name);
+ else if (ret == Z_DATA_ERROR)
+ sprintf(umsg,"Data error in compressed datastream in %s chunk",
+ png_ptr->chunk_name);
+ else
+ sprintf(umsg,"Incomplete compressed datastream in %s chunk",
+ png_ptr->chunk_name);
+ png_warning(png_ptr, umsg);
+#else
+ png_warning(png_ptr,
+ "Incomplete compressed datastream in chunk other than IDAT");
+#endif
+ text_size=prefix_size;
+ if (text == NULL)
+ {
+ text = (png_charp)png_malloc_warn(png_ptr, text_size+1);
+ if (text == NULL)
+ {
+ png_free(png_ptr, chunkdata);
+ png_error(png_ptr,"Not enough memory for text.");
+ }
+ png_memcpy(text, chunkdata, prefix_size);
+ }
+ *(text + text_size) = 0x00;
+ }
+
+ inflateReset(&png_ptr->zstream);
+ png_ptr->zstream.avail_in = 0;
+
+ png_free(png_ptr, chunkdata);
+ chunkdata = text;
+ *newlength=text_size;
+ }
+ else /* if (comp_type != PNG_COMPRESSION_TYPE_BASE) */
+ {
+#if !defined(PNG_NO_STDIO) && !defined(_WIN32_WCE)
+ char umsg[50];
+
+ sprintf(umsg, "Unknown zTXt compression type %d", comp_type);
+ png_warning(png_ptr, umsg);
+#else
+ png_warning(png_ptr, "Unknown zTXt compression type");
+#endif
+
+ *(chunkdata + prefix_size) = 0x00;
+ *newlength=prefix_size;
+ }
+
+ return chunkdata;
+}
+#endif
/* read and check the IDHR chunk */
-void
+void /* PRIVATE */
png_handle_IHDR(png_structp png_ptr, png_infop info_ptr, png_uint_32 length)
{
png_byte buf[13];
png_debug(1, "in png_handle_IHDR\n");
- if (png_ptr->mode != PNG_BEFORE_IHDR)
+ if (png_ptr->mode & PNG_HAVE_IHDR)
png_error(png_ptr, "Out of place IHDR");
/* check the length */
filter_type = buf[11];
interlace_type = buf[12];
- /* check for width and height valid values */
- if (width == 0 || width > (png_uint_32)2147483647L || height == 0 ||
- height > (png_uint_32)2147483647L)
- png_error(png_ptr, "Invalid image size in IHDR");
-
- /* check other values */
- if (bit_depth != 1 && bit_depth != 2 && bit_depth != 4 &&
- bit_depth != 8 && bit_depth != 16)
- png_error(png_ptr, "Invalid bit depth in IHDR");
-
- if (color_type < 0 || color_type == 1 ||
- color_type == 5 || color_type > 6)
- png_error(png_ptr, "Invalid color type in IHDR");
-
- if ((color_type == PNG_COLOR_TYPE_PALETTE && bit_depth) > 8 ||
- ((color_type == PNG_COLOR_TYPE_RGB ||
- color_type == PNG_COLOR_TYPE_GRAY_ALPHA ||
- color_type == PNG_COLOR_TYPE_RGB_ALPHA) && bit_depth < 8))
- png_error(png_ptr, "Invalid color type/bit depth combination in IHDR");
-
- if (interlace_type >= PNG_INTERLACE_LAST)
- png_error(png_ptr, "Unknown interlace method in IHDR");
-
- if (compression_type != PNG_COMPRESSION_TYPE_BASE)
- png_error(png_ptr, "Unknown compression method in IHDR");
-
- if (filter_type != PNG_FILTER_TYPE_BASE)
- png_error(png_ptr, "Unknown filter method in IHDR");
/* set internal variables */
png_ptr->width = width;
png_ptr->bit_depth = (png_byte)bit_depth;
png_ptr->interlaced = (png_byte)interlace_type;
png_ptr->color_type = (png_byte)color_type;
+#if defined(PNG_MNG_FEATURES_SUPPORTED)
+ png_ptr->filter_type = (png_byte)filter_type;
+#endif
/* find number of channels */
switch (png_ptr->color_type)
(png_uint_32)png_ptr->pixel_depth + 7) >> 3);
png_debug1(3,"bit_depth = %d\n", png_ptr->bit_depth);
png_debug1(3,"channels = %d\n", png_ptr->channels);
- png_debug1(3,"rowbytes = %d\n", png_ptr->rowbytes);
+ png_debug1(3,"rowbytes = %lu\n", png_ptr->rowbytes);
png_set_IHDR(png_ptr, info_ptr, width, height, bit_depth,
color_type, interlace_type, compression_type, filter_type);
}
/* read and check the palette */
-void
+void /* PRIVATE */
png_handle_PLTE(png_structp png_ptr, png_infop info_ptr, png_uint_32 length)
{
- png_colorp palette;
+ png_color palette[PNG_MAX_PALETTE_LENGTH];
int num, i;
+#ifndef PNG_NO_POINTER_INDEXING
+ png_colorp pal_ptr;
+#endif
png_debug(1, "in png_handle_PLTE\n");
png_ptr->mode |= PNG_HAVE_PLTE;
+ if (!(png_ptr->color_type&PNG_COLOR_MASK_COLOR))
+ {
+ png_warning(png_ptr,
+ "Ignoring PLTE chunk in grayscale PNG");
+ png_crc_finish(png_ptr, length);
+ return;
+ }
#if !defined(PNG_READ_OPT_PLTE_SUPPORTED)
if (png_ptr->color_type != PNG_COLOR_TYPE_PALETTE)
{
}
#endif
- if (length % 3)
+ if (length > 3*PNG_MAX_PALETTE_LENGTH || length % 3)
{
if (png_ptr->color_type != PNG_COLOR_TYPE_PALETTE)
{
}
num = (int)length / 3;
- palette = (png_colorp)png_zalloc(png_ptr, (uInt)num, sizeof (png_color));
- png_ptr->flags |= PNG_FLAG_FREE_PALETTE;
+
+#ifndef PNG_NO_POINTER_INDEXING
+ for (i = 0, pal_ptr = palette; i < num; i++, pal_ptr++)
+ {
+ png_byte buf[3];
+
+ png_crc_read(png_ptr, buf, 3);
+ pal_ptr->red = buf[0];
+ pal_ptr->green = buf[1];
+ pal_ptr->blue = buf[2];
+ }
+#else
for (i = 0; i < num; i++)
{
png_byte buf[3];
palette[i].green = buf[1];
palette[i].blue = buf[2];
}
+#endif
/* If we actually NEED the PLTE chunk (ie for a paletted image), we do
whatever the normal CRC configuration tells us. However, if we
else
{
png_chunk_warning(png_ptr, "CRC error");
- png_ptr->flags &= ~PNG_FLAG_FREE_PALETTE;
- png_zfree(png_ptr, palette);
return;
}
}
}
}
#endif
- png_ptr->palette = palette;
- png_ptr->num_palette = (png_uint_16)num;
+
png_set_PLTE(png_ptr, info_ptr, palette, num);
-#if defined (PNG_READ_tRNS_SUPPORTED)
+#if defined(PNG_READ_tRNS_SUPPORTED)
if (png_ptr->color_type == PNG_COLOR_TYPE_PALETTE)
{
- if (info_ptr != NULL && info_ptr->valid & PNG_INFO_tRNS)
+ if (info_ptr != NULL && (info_ptr->valid & PNG_INFO_tRNS))
{
- if (png_ptr->num_trans > png_ptr->num_palette)
+ if (png_ptr->num_trans > (png_uint_16)num)
{
png_warning(png_ptr, "Truncating incorrect tRNS chunk length");
- png_ptr->num_trans = png_ptr->num_palette;
+ png_ptr->num_trans = (png_uint_16)num;
+ }
+ if (info_ptr->num_trans > (png_uint_16)num)
+ {
+ png_warning(png_ptr, "Truncating incorrect info tRNS chunk length");
+ info_ptr->num_trans = (png_uint_16)num;
}
}
}
}
-void
+void /* PRIVATE */
png_handle_IEND(png_structp png_ptr, png_infop info_ptr, png_uint_32 length)
{
png_debug(1, "in png_handle_IEND\n");
{
png_error(png_ptr, "No image in file");
- /* to quiet compiler warnings about unused info_ptr */
- if (info_ptr == NULL)
- return;
+ info_ptr = info_ptr; /* quiet compiler warnings about unused info_ptr */
}
- png_ptr->mode |= PNG_AFTER_IDAT | PNG_HAVE_IEND;
+ png_ptr->mode |= (PNG_AFTER_IDAT | PNG_HAVE_IEND);
if (length != 0)
{
}
#if defined(PNG_READ_gAMA_SUPPORTED)
-void
+void /* PRIVATE */
png_handle_gAMA(png_structp png_ptr, png_infop info_ptr, png_uint_32 length)
{
- png_uint_32 igamma;
+ png_fixed_point igamma;
+#ifdef PNG_FLOATING_POINT_SUPPORTED
float file_gamma;
+#endif
png_byte buf[4];
png_debug(1, "in png_handle_gAMA\n");
/* Should be an error, but we can cope with it */
png_warning(png_ptr, "Out of place gAMA chunk");
- else if (info_ptr != NULL && info_ptr->valid & PNG_INFO_gAMA
+ else if (info_ptr != NULL && (info_ptr->valid & PNG_INFO_gAMA)
#if defined(PNG_READ_sRGB_SUPPORTED)
&& !(info_ptr->valid & PNG_INFO_sRGB)
#endif
if (png_crc_finish(png_ptr, 0))
return;
- igamma = png_get_uint_32(buf);
+ igamma = (png_fixed_point)png_get_uint_32(buf);
/* check for zero gamma */
if (igamma == 0)
- return;
+ {
+ png_warning(png_ptr,
+ "Ignoring gAMA chunk with gamma=0");
+ return;
+ }
#if defined(PNG_READ_sRGB_SUPPORTED)
if (info_ptr->valid & PNG_INFO_sRGB)
- if(igamma != (png_uint_32)45000L)
+ if(igamma < 45000L || igamma > 46000L)
{
png_warning(png_ptr,
"Ignoring incorrect gAMA value when sRGB is also present");
#ifndef PNG_NO_CONSOLE_IO
- fprintf(stderr, "igamma = %lu\n", igamma);
+ fprintf(stderr, "gamma = (%d/100000)\n", (int)igamma);
#endif
return;
}
#endif /* PNG_READ_sRGB_SUPPORTED */
+#ifdef PNG_FLOATING_POINT_SUPPORTED
file_gamma = (float)igamma / (float)100000.0;
-#ifdef PNG_READ_GAMMA_SUPPORTED
- png_ptr->gamma = file_gamma;
+# ifdef PNG_READ_GAMMA_SUPPORTED
+ png_ptr->gamma = file_gamma;
+# endif
+ png_set_gAMA(png_ptr, info_ptr, file_gamma);
+#endif
+#ifdef PNG_FIXED_POINT_SUPPORTED
+ png_set_gAMA_fixed(png_ptr, info_ptr, igamma);
#endif
- png_set_gAMA(png_ptr, info_ptr, file_gamma);
}
#endif
#if defined(PNG_READ_sBIT_SUPPORTED)
-void
+void /* PRIVATE */
png_handle_sBIT(png_structp png_ptr, png_infop info_ptr, png_uint_32 length)
{
png_size_t truelen;
/* Should be an error, but we can cope with it */
png_warning(png_ptr, "Out of place sBIT chunk");
}
- else if (info_ptr != NULL && info_ptr->valid & PNG_INFO_sBIT)
+ else if (info_ptr != NULL && (info_ptr->valid & PNG_INFO_sBIT))
{
png_warning(png_ptr, "Duplicate sBIT chunk");
png_crc_finish(png_ptr, length);
#endif
#if defined(PNG_READ_cHRM_SUPPORTED)
-void
+void /* PRIVATE */
png_handle_cHRM(png_structp png_ptr, png_infop info_ptr, png_uint_32 length)
{
png_byte buf[4];
- png_uint_32 val;
+#ifdef PNG_FLOATING_POINT_SUPPORTED
float white_x, white_y, red_x, red_y, green_x, green_y, blue_x, blue_y;
+#endif
+ png_fixed_point int_x_white, int_y_white, int_x_red, int_y_red, int_x_green,
+ int_y_green, int_x_blue, int_y_blue;
+
+ png_uint_32 uint_x, uint_y;
png_debug(1, "in png_handle_cHRM\n");
if (!(png_ptr->mode & PNG_HAVE_IHDR))
- png_error(png_ptr, "Missing IHDR before sBIT");
+ png_error(png_ptr, "Missing IHDR before cHRM");
else if (png_ptr->mode & PNG_HAVE_IDAT)
{
png_warning(png_ptr, "Invalid cHRM after IDAT");
/* Should be an error, but we can cope with it */
png_warning(png_ptr, "Missing PLTE before cHRM");
- else if (info_ptr != NULL && info_ptr->valid & PNG_INFO_cHRM
+ else if (info_ptr != NULL && (info_ptr->valid & PNG_INFO_cHRM)
#if defined(PNG_READ_sRGB_SUPPORTED)
&& !(info_ptr->valid & PNG_INFO_sRGB)
#endif
}
png_crc_read(png_ptr, buf, 4);
- val = png_get_uint_32(buf);
- white_x = (float)val / (float)100000.0;
+ uint_x = png_get_uint_32(buf);
png_crc_read(png_ptr, buf, 4);
- val = png_get_uint_32(buf);
- white_y = (float)val / (float)100000.0;
+ uint_y = png_get_uint_32(buf);
- if (white_x < 0 || white_x > 0.8 || white_y < 0 || white_y > 0.8 ||
- white_x + white_y > 1.0)
+ if (uint_x > 80000L || uint_y > 80000L ||
+ uint_x + uint_y > 100000L)
{
png_warning(png_ptr, "Invalid cHRM white point");
png_crc_finish(png_ptr, 24);
return;
}
+ int_x_white = (png_fixed_point)uint_x;
+ int_y_white = (png_fixed_point)uint_y;
png_crc_read(png_ptr, buf, 4);
- val = png_get_uint_32(buf);
- red_x = (float)val / (float)100000.0;
+ uint_x = png_get_uint_32(buf);
png_crc_read(png_ptr, buf, 4);
- val = png_get_uint_32(buf);
- red_y = (float)val / (float)100000.0;
+ uint_y = png_get_uint_32(buf);
- if (red_x < 0 || red_x > 0.8 || red_y < 0 || red_y > 0.8 ||
- red_x + red_y > 1.0)
+ if (uint_x > 80000L || uint_y > 80000L ||
+ uint_x + uint_y > 100000L)
{
png_warning(png_ptr, "Invalid cHRM red point");
png_crc_finish(png_ptr, 16);
return;
}
+ int_x_red = (png_fixed_point)uint_x;
+ int_y_red = (png_fixed_point)uint_y;
png_crc_read(png_ptr, buf, 4);
- val = png_get_uint_32(buf);
- green_x = (float)val / (float)100000.0;
+ uint_x = png_get_uint_32(buf);
png_crc_read(png_ptr, buf, 4);
- val = png_get_uint_32(buf);
- green_y = (float)val / (float)100000.0;
+ uint_y = png_get_uint_32(buf);
- if (green_x < 0 || green_x > 0.8 || green_y < 0 || green_y > 0.8 ||
- green_x + green_y > 1.0)
+ if (uint_x > 80000L || uint_y > 80000L ||
+ uint_x + uint_y > 100000L)
{
png_warning(png_ptr, "Invalid cHRM green point");
png_crc_finish(png_ptr, 8);
return;
}
+ int_x_green = (png_fixed_point)uint_x;
+ int_y_green = (png_fixed_point)uint_y;
png_crc_read(png_ptr, buf, 4);
- val = png_get_uint_32(buf);
- blue_x = (float)val / (float)100000.0;
+ uint_x = png_get_uint_32(buf);
png_crc_read(png_ptr, buf, 4);
- val = png_get_uint_32(buf);
- blue_y = (float)val / (float)100000.0;
+ uint_y = png_get_uint_32(buf);
- if (blue_x < (float)0 || blue_x > (float)0.8 || blue_y < (float)0 ||
- blue_y > (float)0.8 || blue_x + blue_y > (float)1.0)
+ if (uint_x > 80000L || uint_y > 80000L ||
+ uint_x + uint_y > 100000L)
{
png_warning(png_ptr, "Invalid cHRM blue point");
png_crc_finish(png_ptr, 0);
return;
}
-
- if (png_crc_finish(png_ptr, 0))
- return;
+ int_x_blue = (png_fixed_point)uint_x;
+ int_y_blue = (png_fixed_point)uint_y;
+
+#ifdef PNG_FLOATING_POINT_SUPPORTED
+ white_x = (float)int_x_white / (float)100000.0;
+ white_y = (float)int_y_white / (float)100000.0;
+ red_x = (float)int_x_red / (float)100000.0;
+ red_y = (float)int_y_red / (float)100000.0;
+ green_x = (float)int_x_green / (float)100000.0;
+ green_y = (float)int_y_green / (float)100000.0;
+ blue_x = (float)int_x_blue / (float)100000.0;
+ blue_y = (float)int_y_blue / (float)100000.0;
+#endif
#if defined(PNG_READ_sRGB_SUPPORTED)
if (info_ptr->valid & PNG_INFO_sRGB)
{
- if (fabs(white_x - (float).3127) > (float).001 ||
- fabs(white_y - (float).3290) > (float).001 ||
- fabs( red_x - (float).6400) > (float).001 ||
- fabs( red_y - (float).3300) > (float).001 ||
- fabs(green_x - (float).3000) > (float).001 ||
- fabs(green_y - (float).6000) > (float).001 ||
- fabs( blue_x - (float).1500) > (float).001 ||
- fabs( blue_y - (float).0600) > (float).001)
+ if (abs(int_x_white - 31270L) > 1000 ||
+ abs(int_y_white - 32900L) > 1000 ||
+ abs(int_x_red - 64000L) > 1000 ||
+ abs(int_y_red - 33000L) > 1000 ||
+ abs(int_x_green - 30000L) > 1000 ||
+ abs(int_y_green - 60000L) > 1000 ||
+ abs(int_x_blue - 15000L) > 1000 ||
+ abs(int_y_blue - 6000L) > 1000)
{
png_warning(png_ptr,
"Ignoring incorrect cHRM value when sRGB is also present");
#ifndef PNG_NO_CONSOLE_IO
+#ifdef PNG_FLOATING_POINT_SUPPORTED
fprintf(stderr,"wx=%f, wy=%f, rx=%f, ry=%f\n",
white_x, white_y, red_x, red_y);
fprintf(stderr,"gx=%f, gy=%f, bx=%f, by=%f\n",
green_x, green_y, blue_x, blue_y);
+#else
+ fprintf(stderr,"wx=%ld, wy=%ld, rx=%ld, ry=%ld\n",
+ int_x_white, int_y_white, int_x_red, int_y_red);
+ fprintf(stderr,"gx=%ld, gy=%ld, bx=%ld, by=%ld\n",
+ int_x_green, int_y_green, int_x_blue, int_y_blue);
#endif
+#endif /* PNG_NO_CONSOLE_IO */
}
+ png_crc_finish(png_ptr, 0);
return;
}
#endif /* PNG_READ_sRGB_SUPPORTED */
+#ifdef PNG_FLOATING_POINT_SUPPORTED
png_set_cHRM(png_ptr, info_ptr,
white_x, white_y, red_x, red_y, green_x, green_y, blue_x, blue_y);
+#endif
+#ifdef PNG_FIXED_POINT_SUPPORTED
+ png_set_cHRM_fixed(png_ptr, info_ptr,
+ int_x_white, int_y_white, int_x_red, int_y_red, int_x_green,
+ int_y_green, int_x_blue, int_y_blue);
+#endif
+ if (png_crc_finish(png_ptr, 0))
+ return;
}
#endif
#if defined(PNG_READ_sRGB_SUPPORTED)
-void
+void /* PRIVATE */
png_handle_sRGB(png_structp png_ptr, png_infop info_ptr, png_uint_32 length)
{
int intent;
/* Should be an error, but we can cope with it */
png_warning(png_ptr, "Out of place sRGB chunk");
- else if (info_ptr != NULL && info_ptr->valid & PNG_INFO_sRGB)
+ else if (info_ptr != NULL && (info_ptr->valid & PNG_INFO_sRGB))
{
png_warning(png_ptr, "Duplicate sRGB chunk");
png_crc_finish(png_ptr, length);
#if defined(PNG_READ_gAMA_SUPPORTED) && defined(PNG_READ_GAMMA_SUPPORTED)
if ((info_ptr->valid & PNG_INFO_gAMA))
- if((png_uint_32)(png_ptr->gamma*(float)100000.+.5) != (png_uint_32)45000L)
+ {
+ int igamma;
+#ifdef PNG_FIXED_POINT_SUPPORTED
+ igamma=(int)info_ptr->int_gamma;
+#else
+# ifdef PNG_FLOATING_POINT_SUPPORTED
+ igamma=(int)(info_ptr->gamma * 100000.);
+# endif
+#endif
+ if(igamma < 45000L || igamma > 46000L)
{
png_warning(png_ptr,
"Ignoring incorrect gAMA value when sRGB is also present");
#ifndef PNG_NO_CONSOLE_IO
- fprintf(stderr,"gamma=%f\n",png_ptr->gamma);
+# ifdef PNG_FIXED_POINT_SUPPORTED
+ fprintf(stderr,"incorrect gamma=(%d/100000)\n",(int)png_ptr->int_gamma);
+# else
+# ifdef PNG_FLOATING_POINT_SUPPORTED
+ fprintf(stderr,"incorrect gamma=%f\n",png_ptr->gamma);
+# endif
+# endif
#endif
}
+ }
#endif /* PNG_READ_gAMA_SUPPORTED */
#ifdef PNG_READ_cHRM_SUPPORTED
+#ifdef PNG_FIXED_POINT_SUPPORTED
if (info_ptr->valid & PNG_INFO_cHRM)
- if (fabs(info_ptr->x_white - (float).3127) > (float).001 ||
- fabs(info_ptr->y_white - (float).3290) > (float).001 ||
- fabs( info_ptr->x_red - (float).6400) > (float).001 ||
- fabs( info_ptr->y_red - (float).3300) > (float).001 ||
- fabs(info_ptr->x_green - (float).3000) > (float).001 ||
- fabs(info_ptr->y_green - (float).6000) > (float).001 ||
- fabs( info_ptr->x_blue - (float).1500) > (float).001 ||
- fabs( info_ptr->y_blue - (float).0600) > (float).001)
+ if (abs(info_ptr->int_x_white - 31270L) > 1000 ||
+ abs(info_ptr->int_y_white - 32900L) > 1000 ||
+ abs(info_ptr->int_x_red - 64000L) > 1000 ||
+ abs(info_ptr->int_y_red - 33000L) > 1000 ||
+ abs(info_ptr->int_x_green - 30000L) > 1000 ||
+ abs(info_ptr->int_y_green - 60000L) > 1000 ||
+ abs(info_ptr->int_x_blue - 15000L) > 1000 ||
+ abs(info_ptr->int_y_blue - 6000L) > 1000)
{
png_warning(png_ptr,
"Ignoring incorrect cHRM value when sRGB is also present");
}
+#endif /* PNG_FIXED_POINT_SUPPORTED */
#endif /* PNG_READ_cHRM_SUPPORTED */
png_set_sRGB_gAMA_and_cHRM(png_ptr, info_ptr, intent);
}
#endif /* PNG_READ_sRGB_SUPPORTED */
+#if defined(PNG_READ_iCCP_SUPPORTED)
+void /* PRIVATE */
+png_handle_iCCP(png_structp png_ptr, png_infop info_ptr, png_uint_32 length)
+/* Note: this does not properly handle chunks that are > 64K under DOS */
+{
+ png_charp chunkdata;
+ png_byte compression_type;
+ png_bytep pC;
+ png_charp profile;
+ png_uint_32 skip = 0;
+ png_uint_32 profile_size = 0;
+ png_uint_32 profile_length = 0;
+ png_size_t slength, prefix_length, data_length;
+
+ png_debug(1, "in png_handle_iCCP\n");
+
+ if (!(png_ptr->mode & PNG_HAVE_IHDR))
+ png_error(png_ptr, "Missing IHDR before iCCP");
+ else if (png_ptr->mode & PNG_HAVE_IDAT)
+ {
+ png_warning(png_ptr, "Invalid iCCP after IDAT");
+ png_crc_finish(png_ptr, length);
+ return;
+ }
+ else if (png_ptr->mode & PNG_HAVE_PLTE)
+ /* Should be an error, but we can cope with it */
+ png_warning(png_ptr, "Out of place iCCP chunk");
+
+ else if (info_ptr != NULL && (info_ptr->valid & PNG_INFO_iCCP))
+ {
+ png_warning(png_ptr, "Duplicate iCCP chunk");
+ png_crc_finish(png_ptr, length);
+ return;
+ }
+
+#ifdef PNG_MAX_MALLOC_64K
+ if (length > (png_uint_32)65535L)
+ {
+ png_warning(png_ptr, "iCCP chunk too large to fit in memory");
+ skip = length - (png_uint_32)65535L;
+ length = (png_uint_32)65535L;
+ }
+#endif
+
+ chunkdata = (png_charp)png_malloc(png_ptr, length + 1);
+ slength = (png_size_t)length;
+ png_crc_read(png_ptr, (png_bytep)chunkdata, slength);
+
+ if (png_crc_finish(png_ptr, skip))
+ {
+ png_free(png_ptr, chunkdata);
+ return;
+ }
+
+ chunkdata[slength] = 0x00;
+
+ for (profile = chunkdata; *profile; profile++)
+ /* empty loop to find end of name */ ;
+
+ ++profile;
+
+ /* there should be at least one zero (the compression type byte)
+ following the separator, and we should be on it */
+ if ( profile >= chunkdata + slength)
+ {
+ png_free(png_ptr, chunkdata);
+ png_warning(png_ptr, "Malformed iCCP chunk");
+ return;
+ }
+
+ /* compression_type should always be zero */
+ compression_type = *profile++;
+ if (compression_type)
+ {
+ png_warning(png_ptr, "Ignoring nonzero compression type in iCCP chunk");
+ compression_type=0x00; /* Reset it to zero (libpng-1.0.6 through 1.0.8
+ wrote nonzero) */
+ }
+
+ prefix_length = profile - chunkdata;
+ chunkdata = png_decompress_chunk(png_ptr, compression_type, chunkdata,
+ slength, prefix_length, &data_length);
+
+ profile_length = data_length - prefix_length;
+
+ if ( prefix_length > data_length || profile_length < 4)
+ {
+ png_free(png_ptr, chunkdata);
+ png_warning(png_ptr, "Profile size field missing from iCCP chunk");
+ return;
+ }
+
+ /* Check the profile_size recorded in the first 32 bits of the ICC profile */
+ pC = (png_bytep)(chunkdata+prefix_length);
+ profile_size = ((*(pC ))<<24) |
+ ((*(pC+1))<<16) |
+ ((*(pC+2))<< 8) |
+ ((*(pC+3)) );
+
+ if(profile_size < profile_length)
+ profile_length = profile_size;
+
+ if(profile_size > profile_length)
+ {
+ png_free(png_ptr, chunkdata);
+ png_warning(png_ptr, "Ignoring truncated iCCP profile.\n");
+ return;
+ }
+
+ png_set_iCCP(png_ptr, info_ptr, chunkdata, compression_type,
+ chunkdata + prefix_length, profile_length);
+ png_free(png_ptr, chunkdata);
+}
+#endif /* PNG_READ_iCCP_SUPPORTED */
+
+#if defined(PNG_READ_sPLT_SUPPORTED)
+void /* PRIVATE */
+png_handle_sPLT(png_structp png_ptr, png_infop info_ptr, png_uint_32 length)
+/* Note: this does not properly handle chunks that are > 64K under DOS */
+{
+ png_bytep chunkdata;
+ png_bytep entry_start;
+ png_sPLT_t new_palette;
+#ifdef PNG_NO_POINTER_INDEXING
+ png_sPLT_entryp pp;
+#endif
+ int data_length, entry_size, i;
+ png_uint_32 skip = 0;
+ png_size_t slength;
+
+ png_debug(1, "in png_handle_sPLT\n");
+
+ if (!(png_ptr->mode & PNG_HAVE_IHDR))
+ png_error(png_ptr, "Missing IHDR before sPLT");
+ else if (png_ptr->mode & PNG_HAVE_IDAT)
+ {
+ png_warning(png_ptr, "Invalid sPLT after IDAT");
+ png_crc_finish(png_ptr, length);
+ return;
+ }
+
+#ifdef PNG_MAX_MALLOC_64K
+ if (length > (png_uint_32)65535L)
+ {
+ png_warning(png_ptr, "sPLT chunk too large to fit in memory");
+ skip = length - (png_uint_32)65535L;
+ length = (png_uint_32)65535L;
+ }
+#endif
+
+ chunkdata = (png_bytep)png_malloc(png_ptr, length + 1);
+ slength = (png_size_t)length;
+ png_crc_read(png_ptr, (png_bytep)chunkdata, slength);
+
+ if (png_crc_finish(png_ptr, skip))
+ {
+ png_free(png_ptr, chunkdata);
+ return;
+ }
+
+ chunkdata[slength] = 0x00;
+
+ for (entry_start = chunkdata; *entry_start; entry_start++)
+ /* empty loop to find end of name */ ;
+ ++entry_start;
+
+ /* a sample depth should follow the separator, and we should be on it */
+ if (entry_start > chunkdata + slength)
+ {
+ png_free(png_ptr, chunkdata);
+ png_warning(png_ptr, "malformed sPLT chunk");
+ return;
+ }
+
+ new_palette.depth = *entry_start++;
+ entry_size = (new_palette.depth == 8 ? 6 : 10);
+ data_length = (slength - (entry_start - chunkdata));
+
+ /* integrity-check the data length */
+ if (data_length % entry_size)
+ {
+ png_free(png_ptr, chunkdata);
+ png_warning(png_ptr, "sPLT chunk has bad length");
+ return;
+ }
+
+ new_palette.nentries = data_length / entry_size;
+ new_palette.entries = (png_sPLT_entryp)png_malloc(
+ png_ptr, new_palette.nentries * sizeof(png_sPLT_entry));
+
+#ifndef PNG_NO_POINTER_INDEXING
+ for (i = 0; i < new_palette.nentries; i++)
+ {
+ png_sPLT_entryp pp = new_palette.entries + i;
+
+ if (new_palette.depth == 8)
+ {
+ pp->red = *entry_start++;
+ pp->green = *entry_start++;
+ pp->blue = *entry_start++;
+ pp->alpha = *entry_start++;
+ }
+ else
+ {
+ pp->red = png_get_uint_16(entry_start); entry_start += 2;
+ pp->green = png_get_uint_16(entry_start); entry_start += 2;
+ pp->blue = png_get_uint_16(entry_start); entry_start += 2;
+ pp->alpha = png_get_uint_16(entry_start); entry_start += 2;
+ }
+ pp->frequency = png_get_uint_16(entry_start); entry_start += 2;
+ }
+#else
+ pp = new_palette.entries;
+ for (i = 0; i < new_palette.nentries; i++)
+ {
+
+ if (new_palette.depth == 8)
+ {
+ pp[i].red = *entry_start++;
+ pp[i].green = *entry_start++;
+ pp[i].blue = *entry_start++;
+ pp[i].alpha = *entry_start++;
+ }
+ else
+ {
+ pp[i].red = png_get_uint_16(entry_start); entry_start += 2;
+ pp[i].green = png_get_uint_16(entry_start); entry_start += 2;
+ pp[i].blue = png_get_uint_16(entry_start); entry_start += 2;
+ pp[i].alpha = png_get_uint_16(entry_start); entry_start += 2;
+ }
+ pp->frequency = png_get_uint_16(entry_start); entry_start += 2;
+ }
+#endif
+
+ /* discard all chunk data except the name and stash that */
+ new_palette.name = (png_charp)chunkdata;
+
+ png_set_sPLT(png_ptr, info_ptr, &new_palette, 1);
+
+ png_free(png_ptr, chunkdata);
+ png_free(png_ptr, new_palette.entries);
+}
+#endif /* PNG_READ_sPLT_SUPPORTED */
+
#if defined(PNG_READ_tRNS_SUPPORTED)
-void
+void /* PRIVATE */
png_handle_tRNS(png_structp png_ptr, png_infop info_ptr, png_uint_32 length)
{
+ png_byte readbuf[PNG_MAX_PALETTE_LENGTH];
+
png_debug(1, "in png_handle_tRNS\n");
if (!(png_ptr->mode & PNG_HAVE_IHDR))
png_crc_finish(png_ptr, length);
return;
}
- else if (info_ptr != NULL && info_ptr->valid & PNG_INFO_tRNS)
+ else if (info_ptr != NULL && (info_ptr->valid & PNG_INFO_tRNS))
{
png_warning(png_ptr, "Duplicate tRNS chunk");
png_crc_finish(png_ptr, length);
/* Should be an error, but we can cope with it */
png_warning(png_ptr, "Missing PLTE before tRNS");
}
- else if (length > png_ptr->num_palette)
+ else if (length > (png_uint_32)png_ptr->num_palette)
{
png_warning(png_ptr, "Incorrect tRNS chunk length");
png_crc_finish(png_ptr, length);
return;
}
- png_ptr->trans = (png_bytep)png_malloc(png_ptr, length);
- png_ptr->flags |= PNG_FLAG_FREE_TRANS;
- png_crc_read(png_ptr, png_ptr->trans, (png_size_t)length);
+ png_crc_read(png_ptr, readbuf, (png_size_t)length);
png_ptr->num_trans = (png_uint_16)length;
}
else if (png_ptr->color_type == PNG_COLOR_TYPE_RGB)
if (png_crc_finish(png_ptr, 0))
return;
- png_set_tRNS(png_ptr, info_ptr, png_ptr->trans, png_ptr->num_trans,
+ png_set_tRNS(png_ptr, info_ptr, readbuf, png_ptr->num_trans,
&(png_ptr->trans_values));
}
#endif
#if defined(PNG_READ_bKGD_SUPPORTED)
-void
+void /* PRIVATE */
png_handle_bKGD(png_structp png_ptr, png_infop info_ptr, png_uint_32 length)
{
png_size_t truelen;
png_crc_finish(png_ptr, length);
return;
}
- else if (info_ptr != NULL && info_ptr->valid & PNG_INFO_bKGD)
+ else if (info_ptr != NULL && (info_ptr->valid & PNG_INFO_bKGD))
{
png_warning(png_ptr, "Duplicate bKGD chunk");
png_crc_finish(png_ptr, length);
if (png_ptr->color_type == PNG_COLOR_TYPE_PALETTE)
{
png_ptr->background.index = buf[0];
- png_ptr->background.red = (png_uint_16)png_ptr->palette[buf[0]].red;
- png_ptr->background.green = (png_uint_16)png_ptr->palette[buf[0]].green;
- png_ptr->background.blue = (png_uint_16)png_ptr->palette[buf[0]].blue;
+ if(info_ptr->num_palette)
+ {
+ if(buf[0] > info_ptr->num_palette)
+ {
+ png_warning(png_ptr, "Incorrect bKGD chunk index value");
+ return;
+ }
+ png_ptr->background.red =
+ (png_uint_16)png_ptr->palette[buf[0]].red;
+ png_ptr->background.green =
+ (png_uint_16)png_ptr->palette[buf[0]].green;
+ png_ptr->background.blue =
+ (png_uint_16)png_ptr->palette[buf[0]].blue;
+ }
}
else if (!(png_ptr->color_type & PNG_COLOR_MASK_COLOR)) /* GRAY */
{
#endif
#if defined(PNG_READ_hIST_SUPPORTED)
-void
+void /* PRIVATE */
png_handle_hIST(png_structp png_ptr, png_infop info_ptr, png_uint_32 length)
{
int num, i;
+ png_uint_16 readbuf[PNG_MAX_PALETTE_LENGTH];
png_debug(1, "in png_handle_hIST\n");
png_crc_finish(png_ptr, length);
return;
}
- else if (info_ptr != NULL && info_ptr->valid & PNG_INFO_hIST)
+ else if (info_ptr != NULL && (info_ptr->valid & PNG_INFO_hIST))
{
png_warning(png_ptr, "Duplicate hIST chunk");
png_crc_finish(png_ptr, length);
return;
}
- if (length != (png_uint_32)(2 * png_ptr->num_palette))
+ num = (int)length / 2 ;
+ if (num != png_ptr->num_palette)
{
png_warning(png_ptr, "Incorrect hIST chunk length");
png_crc_finish(png_ptr, length);
return;
}
- num = (int)length / 2;
- png_ptr->hist = (png_uint_16p)png_malloc(png_ptr,
- (png_uint_32)(num * sizeof (png_uint_16)));
- png_ptr->flags |= PNG_FLAG_FREE_HIST;
for (i = 0; i < num; i++)
{
png_byte buf[2];
png_crc_read(png_ptr, buf, 2);
- png_ptr->hist[i] = png_get_uint_16(buf);
+ readbuf[i] = png_get_uint_16(buf);
}
if (png_crc_finish(png_ptr, 0))
return;
- png_set_hIST(png_ptr, info_ptr, png_ptr->hist);
+ png_set_hIST(png_ptr, info_ptr, readbuf);
}
#endif
#if defined(PNG_READ_pHYs_SUPPORTED)
-void
+void /* PRIVATE */
png_handle_pHYs(png_structp png_ptr, png_infop info_ptr, png_uint_32 length)
{
png_byte buf[9];
png_debug(1, "in png_handle_pHYs\n");
if (!(png_ptr->mode & PNG_HAVE_IHDR))
- png_error(png_ptr, "Missing IHDR before pHYS");
+ png_error(png_ptr, "Missing IHDR before pHYs");
else if (png_ptr->mode & PNG_HAVE_IDAT)
{
- png_warning(png_ptr, "Invalid pHYS after IDAT");
+ png_warning(png_ptr, "Invalid pHYs after IDAT");
png_crc_finish(png_ptr, length);
return;
}
- else if (info_ptr != NULL && info_ptr->valid & PNG_INFO_pHYs)
+ else if (info_ptr != NULL && (info_ptr->valid & PNG_INFO_pHYs))
{
- png_warning(png_ptr, "Duplicate pHYS chunk");
+ png_warning(png_ptr, "Duplicate pHYs chunk");
png_crc_finish(png_ptr, length);
return;
}
#endif
#if defined(PNG_READ_oFFs_SUPPORTED)
-void
+void /* PRIVATE */
png_handle_oFFs(png_structp png_ptr, png_infop info_ptr, png_uint_32 length)
{
png_byte buf[9];
- png_uint_32 offset_x, offset_y;
+ png_int_32 offset_x, offset_y;
int unit_type;
png_debug(1, "in png_handle_oFFs\n");
png_crc_finish(png_ptr, length);
return;
}
- else if (info_ptr != NULL && info_ptr->valid & PNG_INFO_oFFs)
+ else if (info_ptr != NULL && (info_ptr->valid & PNG_INFO_oFFs))
{
png_warning(png_ptr, "Duplicate oFFs chunk");
png_crc_finish(png_ptr, length);
if (png_crc_finish(png_ptr, 0))
return;
- offset_x = png_get_uint_32(buf);
- offset_y = png_get_uint_32(buf + 4);
+ offset_x = png_get_int_32(buf);
+ offset_y = png_get_int_32(buf + 4);
unit_type = buf[8];
png_set_oFFs(png_ptr, info_ptr, offset_x, offset_y, unit_type);
}
#endif
#if defined(PNG_READ_pCAL_SUPPORTED)
-/* read the pCAL chunk (png-scivis-19970203) */
-void
+/* read the pCAL chunk (described in the PNG Extensions document) */
+void /* PRIVATE */
png_handle_pCAL(png_structp png_ptr, png_infop info_ptr, png_uint_32 length)
{
png_charp purpose;
png_crc_finish(png_ptr, length);
return;
}
- else if (info_ptr != NULL && info_ptr->valid & PNG_INFO_pCAL)
+ else if (info_ptr != NULL && (info_ptr->valid & PNG_INFO_pCAL))
{
png_warning(png_ptr, "Duplicate pCAL chunk");
png_crc_finish(png_ptr, length);
return;
}
- png_debug1(2, "Allocating and reading pCAL chunk data (%d bytes)\n",
+ png_debug1(2, "Allocating and reading pCAL chunk data (%lu bytes)\n",
length + 1);
- purpose = (png_charp)png_malloc(png_ptr, length + 1);
+ purpose = (png_charp)png_malloc_warn(png_ptr, length + 1);
+ if (purpose == NULL)
+ {
+ png_warning(png_ptr, "No memory for pCAL purpose.");
+ return;
+ }
slength = (png_size_t)length;
png_crc_read(png_ptr, (png_bytep)purpose, slength);
/* Empty loop to move past the units string. */ ;
png_debug(3, "Allocating pCAL parameters array\n");
- params = (png_charpp)png_malloc(png_ptr, (png_uint_32)(nparams
+ params = (png_charpp)png_malloc_warn(png_ptr, (png_uint_32)(nparams
*sizeof(png_charp))) ;
+ if (params == NULL)
+ {
+ png_free(png_ptr, purpose);
+ png_warning(png_ptr, "No memory for pCAL params.");
+ return;
+ }
/* Get pointers to the start of each parameter string. */
for (i = 0; i < (int)nparams; i++)
}
#endif
+#if defined(PNG_READ_sCAL_SUPPORTED)
+/* read the sCAL chunk */
+void /* PRIVATE */
+png_handle_sCAL(png_structp png_ptr, png_infop info_ptr, png_uint_32 length)
+{
+ png_charp buffer, ep;
+#ifdef PNG_FLOATING_POINT_SUPPORTED
+ double width, height;
+ png_charp vp;
+#else
+#ifdef PNG_FIXED_POINT_SUPPORTED
+ png_charp swidth, sheight;
+#endif
+#endif
+ png_size_t slength;
+
+ png_debug(1, "in png_handle_sCAL\n");
+
+ if (!(png_ptr->mode & PNG_HAVE_IHDR))
+ png_error(png_ptr, "Missing IHDR before sCAL");
+ else if (png_ptr->mode & PNG_HAVE_IDAT)
+ {
+ png_warning(png_ptr, "Invalid sCAL after IDAT");
+ png_crc_finish(png_ptr, length);
+ return;
+ }
+ else if (info_ptr != NULL && (info_ptr->valid & PNG_INFO_sCAL))
+ {
+ png_warning(png_ptr, "Duplicate sCAL chunk");
+ png_crc_finish(png_ptr, length);
+ return;
+ }
+
+ png_debug1(2, "Allocating and reading sCAL chunk data (%lu bytes)\n",
+ length + 1);
+ buffer = (png_charp)png_malloc_warn(png_ptr, length + 1);
+ if (buffer == NULL)
+ {
+ png_warning(png_ptr, "Out of memory while processing sCAL chunk");
+ return;
+ }
+ slength = (png_size_t)length;
+ png_crc_read(png_ptr, (png_bytep)buffer, slength);
+
+ if (png_crc_finish(png_ptr, 0))
+ {
+ png_free(png_ptr, buffer);
+ return;
+ }
+
+ buffer[slength] = 0x00; /* null terminate the last string */
+
+ ep = buffer + 1; /* skip unit byte */
+
+#ifdef PNG_FLOATING_POINT_SUPPORTED
+ width = strtod(ep, &vp);
+ if (*vp)
+ {
+ png_warning(png_ptr, "malformed width string in sCAL chunk");
+ return;
+ }
+#else
+#ifdef PNG_FIXED_POINT_SUPPORTED
+ swidth = (png_charp)png_malloc_warn(png_ptr, png_strlen(ep) + 1);
+ if (swidth == NULL)
+ {
+ png_warning(png_ptr, "Out of memory while processing sCAL chunk width");
+ return;
+ }
+ png_memcpy(swidth, ep, (png_size_t)png_strlen(ep));
+#endif
+#endif
+
+ for (ep = buffer; *ep; ep++)
+ /* empty loop */ ;
+ ep++;
+
+#ifdef PNG_FLOATING_POINT_SUPPORTED
+ height = strtod(ep, &vp);
+ if (*vp)
+ {
+ png_warning(png_ptr, "malformed height string in sCAL chunk");
+ return;
+ }
+#else
+#ifdef PNG_FIXED_POINT_SUPPORTED
+ sheight = (png_charp)png_malloc_warn(png_ptr, png_strlen(ep) + 1);
+ if (swidth == NULL)
+ {
+ png_warning(png_ptr, "Out of memory while processing sCAL chunk height");
+ return;
+ }
+ png_memcpy(sheight, ep, (png_size_t)png_strlen(ep));
+#endif
+#endif
+
+ if (buffer + slength < ep
+#ifdef PNG_FLOATING_POINT_SUPPORTED
+ || width <= 0. || height <= 0.
+#endif
+ )
+ {
+ png_warning(png_ptr, "Invalid sCAL data");
+ png_free(png_ptr, buffer);
+#if defined(PNG_FIXED_POINT_SUPPORTED) && !defined(PNG_FLOATING_POINT_SUPPORTED)
+ png_free(png_ptr, swidth);
+ png_free(png_ptr, sheight);
+#endif
+ return;
+ }
+
+
+#ifdef PNG_FLOATING_POINT_SUPPORTED
+ png_set_sCAL(png_ptr, info_ptr, buffer[0], width, height);
+#else
+#ifdef PNG_FIXED_POINT_SUPPORTED
+ png_set_sCAL_s(png_ptr, info_ptr, buffer[0], swidth, sheight);
+#endif
+#endif
+
+ png_free(png_ptr, buffer);
+#if defined(PNG_FIXED_POINT_SUPPORTED) && !defined(PNG_FLOATING_POINT_SUPPORTED)
+ png_free(png_ptr, swidth);
+ png_free(png_ptr, sheight);
+#endif
+}
+#endif
+
#if defined(PNG_READ_tIME_SUPPORTED)
-void
+void /* PRIVATE */
png_handle_tIME(png_structp png_ptr, png_infop info_ptr, png_uint_32 length)
{
png_byte buf[7];
if (!(png_ptr->mode & PNG_HAVE_IHDR))
png_error(png_ptr, "Out of place tIME chunk");
- else if (info_ptr != NULL && info_ptr->valid & PNG_INFO_tIME)
+ else if (info_ptr != NULL && (info_ptr->valid & PNG_INFO_tIME))
{
png_warning(png_ptr, "Duplicate tIME chunk");
png_crc_finish(png_ptr, length);
#if defined(PNG_READ_tEXt_SUPPORTED)
/* Note: this does not properly handle chunks that are > 64K under DOS */
-void
+void /* PRIVATE */
png_handle_tEXt(png_structp png_ptr, png_infop info_ptr, png_uint_32 length)
{
png_textp text_ptr;
png_charp text;
png_uint_32 skip = 0;
png_size_t slength;
+ int ret;
png_debug(1, "in png_handle_tEXt\n");
}
#endif
- key = (png_charp)png_malloc(png_ptr, length + 1);
+ key = (png_charp)png_malloc_warn(png_ptr, length + 1);
+ if (key == NULL)
+ {
+ png_warning(png_ptr, "No memory to process text chunk.");
+ return;
+ }
slength = (png_size_t)length;
png_crc_read(png_ptr, (png_bytep)key, slength);
if (text != key + slength)
text++;
- text_ptr = (png_textp)png_malloc(png_ptr, (png_uint_32)sizeof(png_text));
+ text_ptr = (png_textp)png_malloc_warn(png_ptr, (png_uint_32)sizeof(png_text));
+ if (text_ptr == NULL)
+ {
+ png_warning(png_ptr, "Not enough memory to process text chunk.");
+ png_free(png_ptr, key);
+ return;
+ }
text_ptr->compression = PNG_TEXT_COMPRESSION_NONE;
text_ptr->key = key;
+#ifdef PNG_iTXt_SUPPORTED
+ text_ptr->lang = NULL;
+ text_ptr->lang_key = NULL;
+ text_ptr->itxt_length = 0;
+#endif
text_ptr->text = text;
+ text_ptr->text_length = png_strlen(text);
- png_set_text(png_ptr, info_ptr, text_ptr, 1);
+ ret=png_set_text_2(png_ptr, info_ptr, text_ptr, 1);
+ png_free(png_ptr, key);
png_free(png_ptr, text_ptr);
+ if (ret)
+ png_warning(png_ptr, "Insufficient memory to process text chunk.");
}
#endif
#if defined(PNG_READ_zTXt_SUPPORTED)
/* note: this does not correctly handle chunks that are > 64K under DOS */
-void
+void /* PRIVATE */
png_handle_zTXt(png_structp png_ptr, png_infop info_ptr, png_uint_32 length)
{
- static char msg[] = "Error decoding zTXt chunk";
png_textp text_ptr;
- png_charp key;
+ png_charp chunkdata;
png_charp text;
- int comp_type = PNG_TEXT_COMPRESSION_NONE;
- png_size_t slength;
+ int comp_type;
+ int ret;
+ png_size_t slength, prefix_len, data_len;
png_debug(1, "in png_handle_zTXt\n");
-
if (!(png_ptr->mode & PNG_HAVE_IHDR))
png_error(png_ptr, "Missing IHDR before zTXt");
}
#endif
- key = (png_charp)png_malloc(png_ptr, length + 1);
+ chunkdata = (png_charp)png_malloc_warn(png_ptr, length + 1);
+ if (chunkdata == NULL)
+ {
+ png_warning(png_ptr,"Out of memory processing zTXt chunk.");
+ return;
+ }
slength = (png_size_t)length;
- png_crc_read(png_ptr, (png_bytep)key, slength);
+ png_crc_read(png_ptr, (png_bytep)chunkdata, slength);
if (png_crc_finish(png_ptr, 0))
{
- png_free(png_ptr, key);
+ png_free(png_ptr, chunkdata);
return;
}
- key[slength] = 0x00;
+ chunkdata[slength] = 0x00;
- for (text = key; *text; text++)
+ for (text = chunkdata; *text; text++)
/* empty loop */ ;
- /* zTXt must have some text after the keyword */
- if (text == key + slength)
+ /* zTXt must have some text after the chunkdataword */
+ if (text == chunkdata + slength)
{
+ comp_type = PNG_TEXT_COMPRESSION_NONE;
png_warning(png_ptr, "Zero length zTXt chunk");
}
- else if ((comp_type = *(++text)) == PNG_TEXT_COMPRESSION_zTXt)
+ else
{
- png_size_t text_size, key_size;
- text++;
+ comp_type = *(++text);
+ if (comp_type != PNG_TEXT_COMPRESSION_zTXt)
+ {
+ png_warning(png_ptr, "Unknown compression type in zTXt chunk");
+ comp_type = PNG_TEXT_COMPRESSION_zTXt;
+ }
+ text++; /* skip the compression_method byte */
+ }
+ prefix_len = text - chunkdata;
- png_ptr->zstream.next_in = (png_bytep)text;
- png_ptr->zstream.avail_in = (uInt)(length - (text - key));
- png_ptr->zstream.next_out = png_ptr->zbuf;
- png_ptr->zstream.avail_out = (uInt)png_ptr->zbuf_size;
+ chunkdata = (png_charp)png_decompress_chunk(png_ptr, comp_type, chunkdata,
+ (png_size_t)length, prefix_len, &data_len);
- key_size = (png_size_t)(text - key);
- text_size = 0;
- text = NULL;
+ text_ptr = (png_textp)png_malloc_warn(png_ptr, (png_uint_32)sizeof(png_text));
+ if (text_ptr == NULL)
+ {
+ png_warning(png_ptr,"Not enough memory to process zTXt chunk.");
+ png_free(png_ptr, chunkdata);
+ return;
+ }
+ text_ptr->compression = comp_type;
+ text_ptr->key = chunkdata;
+#ifdef PNG_iTXt_SUPPORTED
+ text_ptr->lang = NULL;
+ text_ptr->lang_key = NULL;
+ text_ptr->itxt_length = 0;
+#endif
+ text_ptr->text = chunkdata + prefix_len;
+ text_ptr->text_length = data_len;
- while (png_ptr->zstream.avail_in)
- {
- int ret;
+ ret=png_set_text_2(png_ptr, info_ptr, text_ptr, 1);
- ret = inflate(&png_ptr->zstream, Z_PARTIAL_FLUSH);
- if (ret != Z_OK && ret != Z_STREAM_END)
- {
- if (png_ptr->zstream.msg != NULL)
- png_warning(png_ptr, png_ptr->zstream.msg);
- else
- png_warning(png_ptr, msg);
- inflateReset(&png_ptr->zstream);
- png_ptr->zstream.avail_in = 0;
+ png_free(png_ptr, text_ptr);
+ png_free(png_ptr, chunkdata);
+ if (ret)
+ png_error(png_ptr, "Insufficient memory to store zTXt chunk.");
+}
+#endif
- if (text == NULL)
- {
- text_size = key_size + sizeof(msg) + 1;
- text = (png_charp)png_malloc(png_ptr, (png_uint_32)text_size);
- png_memcpy(text, key, key_size);
- }
+#if defined(PNG_READ_iTXt_SUPPORTED)
+/* note: this does not correctly handle chunks that are > 64K under DOS */
+void /* PRIVATE */
+png_handle_iTXt(png_structp png_ptr, png_infop info_ptr, png_uint_32 length)
+{
+ png_textp text_ptr;
+ png_charp chunkdata;
+ png_charp key, lang, text, lang_key;
+ int comp_flag;
+ int comp_type = 0;
+ int ret;
+ png_size_t slength, prefix_len, data_len;
- text[text_size - 1] = 0x00;
+ png_debug(1, "in png_handle_iTXt\n");
- /* Copy what we can of the error message into the text chunk */
- text_size = (png_size_t)(slength - (text - key) - 1);
- text_size = sizeof(msg) > text_size ? text_size : sizeof(msg);
- png_memcpy(text + key_size, msg, text_size + 1);
- break;
- }
- if (!png_ptr->zstream.avail_out || ret == Z_STREAM_END)
- {
- if (text == NULL)
- {
- text = (png_charp)png_malloc(png_ptr,
- (png_uint_32)(png_ptr->zbuf_size - png_ptr->zstream.avail_out
- + key_size + 1));
- png_memcpy(text + key_size, png_ptr->zbuf,
- png_ptr->zbuf_size - png_ptr->zstream.avail_out);
- png_memcpy(text, key, key_size);
- text_size = key_size + png_ptr->zbuf_size -
- png_ptr->zstream.avail_out;
- *(text + text_size) = 0x00;
- }
- else
- {
- png_charp tmp;
+ if (!(png_ptr->mode & PNG_HAVE_IHDR))
+ png_error(png_ptr, "Missing IHDR before iTXt");
- tmp = text;
- text = (png_charp)png_malloc(png_ptr, (png_uint_32)(text_size +
- png_ptr->zbuf_size - png_ptr->zstream.avail_out + 1));
- png_memcpy(text, tmp, text_size);
- png_free(png_ptr, tmp);
- png_memcpy(text + text_size, png_ptr->zbuf,
- (png_ptr->zbuf_size - png_ptr->zstream.avail_out));
- text_size += png_ptr->zbuf_size - png_ptr->zstream.avail_out;
- *(text + text_size) = 0x00;
- }
- if (ret != Z_STREAM_END)
- {
- png_ptr->zstream.next_out = png_ptr->zbuf;
- png_ptr->zstream.avail_out = (uInt)png_ptr->zbuf_size;
- }
- else
- {
- break;
- }
- }
- }
+ if (png_ptr->mode & PNG_HAVE_IDAT)
+ png_ptr->mode |= PNG_AFTER_IDAT;
- inflateReset(&png_ptr->zstream);
- png_ptr->zstream.avail_in = 0;
+#ifdef PNG_MAX_MALLOC_64K
+ /* We will no doubt have problems with chunks even half this size, but
+ there is no hard and fast rule to tell us where to stop. */
+ if (length > (png_uint_32)65535L)
+ {
+ png_warning(png_ptr,"iTXt chunk too large to fit in memory");
+ png_crc_finish(png_ptr, length);
+ return;
+ }
+#endif
- png_free(png_ptr, key);
- key = text;
- text += key_size;
+ chunkdata = (png_charp)png_malloc_warn(png_ptr, length + 1);
+ if (chunkdata == NULL)
+ {
+ png_warning(png_ptr, "No memory to process iTXt chunk.");
+ return;
}
- else /* if (comp_type >= PNG_TEXT_COMPRESSION_LAST) */
+ slength = (png_size_t)length;
+ png_crc_read(png_ptr, (png_bytep)chunkdata, slength);
+ if (png_crc_finish(png_ptr, 0))
{
- png_size_t text_size;
-#if !defined(PNG_NO_STDIO)
- char umsg[50];
+ png_free(png_ptr, chunkdata);
+ return;
+ }
- sprintf(umsg, "Unknown zTXt compression type %d", comp_type);
- png_warning(png_ptr, umsg);
-#else
- png_warning(png_ptr, "Unknown zTXt compression type");
-#endif
+ chunkdata[slength] = 0x00;
+
+ for (lang = chunkdata; *lang; lang++)
+ /* empty loop */ ;
+ lang++; /* skip NUL separator */
- /* Copy what we can of the error message into the text chunk */
- text_size = (png_size_t)(slength - (text - key) - 1);
- text_size = sizeof(msg) > text_size ? text_size : sizeof(msg);
- png_memcpy(text, msg, text_size + 1);
+ /* iTXt must have a language tag (possibly empty), two compression bytes,
+ translated keyword (possibly empty), and possibly some text after the
+ keyword */
+
+ if (lang >= chunkdata + slength)
+ {
+ comp_flag = PNG_TEXT_COMPRESSION_NONE;
+ png_warning(png_ptr, "Zero length iTXt chunk");
+ }
+ else
+ {
+ comp_flag = *lang++;
+ comp_type = *lang++;
}
- text_ptr = (png_textp)png_malloc(png_ptr, (png_uint_32)sizeof(png_text));
- text_ptr->compression = comp_type;
- text_ptr->key = key;
- text_ptr->text = text;
+ for (lang_key = lang; *lang_key; lang_key++)
+ /* empty loop */ ;
+ lang_key++; /* skip NUL separator */
+
+ for (text = lang_key; *text; text++)
+ /* empty loop */ ;
+ text++; /* skip NUL separator */
- png_set_text(png_ptr, info_ptr, text_ptr, 1);
+ prefix_len = text - chunkdata;
+
+ key=chunkdata;
+ if (comp_flag)
+ chunkdata = png_decompress_chunk(png_ptr, comp_type, chunkdata,
+ (size_t)length, prefix_len, &data_len);
+ else
+ data_len=png_strlen(chunkdata + prefix_len);
+ text_ptr = (png_textp)png_malloc_warn(png_ptr, (png_uint_32)sizeof(png_text));
+ if (text_ptr == NULL)
+ {
+ png_warning(png_ptr,"Not enough memory to process iTXt chunk.");
+ png_free(png_ptr, chunkdata);
+ return;
+ }
+ text_ptr->compression = (int)comp_flag + 1;
+ text_ptr->lang_key = chunkdata+(lang_key-key);
+ text_ptr->lang = chunkdata+(lang-key);
+ text_ptr->itxt_length = data_len;
+ text_ptr->text_length = 0;
+ text_ptr->key = chunkdata;
+ text_ptr->text = chunkdata + prefix_len;
+
+ ret=png_set_text_2(png_ptr, info_ptr, text_ptr, 1);
png_free(png_ptr, text_ptr);
+ png_free(png_ptr, chunkdata);
+ if (ret)
+ png_error(png_ptr, "Insufficient memory to store iTXt chunk.");
}
#endif
/* This function is called when we haven't found a handler for a
chunk. If there isn't a problem with the chunk itself (ie bad
- chunk name, CRC, or a critical chunk), the chunk is silently ignored. */
-void
+ chunk name, CRC, or a critical chunk), the chunk is silently ignored
+ -- unless the PNG_FLAG_UNKNOWN_CHUNKS_SUPPORTED flag is on in which
+ case it will be saved away to be written out later. */
+void /* PRIVATE */
png_handle_unknown(png_structp png_ptr, png_infop info_ptr, png_uint_32 length)
{
+ png_uint_32 skip = 0;
+
png_debug(1, "in png_handle_unknown\n");
- /* In the future we can have code here that calls user-supplied
- * callback functions for unknown chunks before they are ignored or
- * cause an error.
- */
+ if (png_ptr->mode & PNG_HAVE_IDAT)
+ {
+#ifdef PNG_USE_LOCAL_ARRAYS
+ PNG_IDAT;
+#endif
+ if (png_memcmp(png_ptr->chunk_name, png_IDAT, 4)) /* not an IDAT */
+ png_ptr->mode |= PNG_AFTER_IDAT;
+ }
+
png_check_chunk_name(png_ptr, png_ptr->chunk_name);
if (!(png_ptr->chunk_name[0] & 0x20))
{
- png_chunk_error(png_ptr, "unknown critical chunk");
-
- /* to quiet compiler warnings about unused info_ptr */
- if (info_ptr == NULL)
- return;
+#if defined(PNG_READ_UNKNOWN_CHUNKS_SUPPORTED)
+ if(png_handle_as_unknown(png_ptr, png_ptr->chunk_name) !=
+ HANDLE_CHUNK_ALWAYS
+#if defined(PNG_READ_USER_CHUNKS_SUPPORTED)
+ && png_ptr->read_user_chunk_fn == NULL
+#endif
+ )
+#endif
+ png_chunk_error(png_ptr, "unknown critical chunk");
}
- if (png_ptr->mode & PNG_HAVE_IDAT)
- png_ptr->mode |= PNG_AFTER_IDAT;
+#if defined(PNG_READ_UNKNOWN_CHUNKS_SUPPORTED)
+ if (png_ptr->flags & PNG_FLAG_KEEP_UNKNOWN_CHUNKS)
+ {
+ png_unknown_chunk chunk;
- png_crc_finish(png_ptr, length);
+#ifdef PNG_MAX_MALLOC_64K
+ if (length > (png_uint_32)65535L)
+ {
+ png_warning(png_ptr, "unknown chunk too large to fit in memory");
+ skip = length - (png_uint_32)65535L;
+ length = (png_uint_32)65535L;
+ }
+#endif
+ png_strcpy((png_charp)chunk.name, (png_charp)png_ptr->chunk_name);
+ chunk.data = (png_bytep)png_malloc(png_ptr, length);
+ chunk.size = (png_size_t)length;
+ png_crc_read(png_ptr, (png_bytep)chunk.data, length);
+#if defined(PNG_READ_USER_CHUNKS_SUPPORTED)
+ if(png_ptr->read_user_chunk_fn != NULL)
+ {
+ /* callback to user unknown chunk handler */
+ if ((*(png_ptr->read_user_chunk_fn)) (png_ptr, &chunk) <= 0)
+ {
+ if (!(png_ptr->chunk_name[0] & 0x20))
+ if(png_handle_as_unknown(png_ptr, png_ptr->chunk_name) !=
+ HANDLE_CHUNK_ALWAYS)
+ {
+ png_free(png_ptr, chunk.data);
+ png_chunk_error(png_ptr, "unknown critical chunk");
+ }
+ png_set_unknown_chunks(png_ptr, info_ptr, &chunk, 1);
+ }
+ }
+ else
+#endif
+ png_set_unknown_chunks(png_ptr, info_ptr, &chunk, 1);
+ png_free(png_ptr, chunk.data);
+ }
+ else
+#endif
+ skip = length;
+
+ png_crc_finish(png_ptr, skip);
+#if !defined(PNG_READ_USER_CHUNKS_SUPPORTED)
+ info_ptr = info_ptr; /* quiet compiler warnings about unused info_ptr */
+#endif
}
/* This function is called to verify that a chunk name is valid.
#define isnonalpha(c) ((c) < 41 || (c) > 122 || ((c) > 90 && (c) < 97))
-void
+void /* PRIVATE */
png_check_chunk_name(png_structp png_ptr, png_bytep chunk_name)
{
png_debug(1, "in png_check_chunk_name\n");
a zero indicates the pixel is to be skipped. This is in addition
to any alpha or transparency value associated with the pixel. If
you want all pixels to be combined, pass 0xff (255) in mask. */
-void
-png_combine_row(png_structp png_ptr, png_bytep row,
- int mask)
+#ifndef PNG_HAVE_ASSEMBLER_COMBINE_ROW
+void /* PRIVATE */
+png_combine_row(png_structp png_ptr, png_bytep row, int mask)
{
png_debug(1,"in png_combine_row\n");
if (mask == 0xff)
{
int value;
- value = (*sp >> shift) & 0x1;
+ value = (*sp >> shift) & 0x01;
*dp &= (png_byte)((0x7f7f >> (7 - shift)) & 0xff);
*dp |= (png_byte)(value << shift);
}
{
if (m & mask)
{
- value = (*sp >> shift) & 0x3;
+ value = (*sp >> shift) & 0x03;
*dp &= (png_byte)((0x3f3f >> (6 - shift)) & 0xff);
*dp |= (png_byte)(value << shift);
}
}
}
}
+#endif /* !PNG_HAVE_ASSEMBLER_COMBINE_ROW */
-#if defined(PNG_READ_INTERLACING_SUPPORTED)
-void
-png_do_read_interlace(png_row_infop row_info, png_bytep row, int pass,
+#ifdef PNG_READ_INTERLACING_SUPPORTED
+#ifndef PNG_HAVE_ASSEMBLER_READ_INTERLACE /* else in pngvcrd.c, pnggccrd.c */
+/* OLD pre-1.0.9 interface:
+void png_do_read_interlace(png_row_infop row_info, png_bytep row, int pass,
png_uint_32 transformations)
+ */
+void /* PRIVATE */
+png_do_read_interlace(png_structp png_ptr)
{
- png_debug(1,"in png_do_read_interlace\n");
+ png_row_infop row_info = &(png_ptr->row_info);
+ png_bytep row = png_ptr->row_buf + 1;
+ int pass = png_ptr->pass;
+ png_uint_32 transformations = png_ptr->transformations;
+#ifdef PNG_USE_LOCAL_ARRAYS
+ /* arrays to facilitate easy interlacing - use pass (0 - 6) as index */
+ /* offset to next interlace block */
+ const int png_pass_inc[7] = {8, 8, 4, 4, 2, 2, 1};
+#endif
+
+ png_debug(1,"in png_do_read_interlace (stock C version)\n");
if (row != NULL && row_info != NULL)
{
png_uint_32 final_width;
#if defined(PNG_READ_PACKSWAP_SUPPORTED)
if (transformations & PNG_PACKSWAP)
{
- sshift = (int)((row_info->width + 7) & 7);
- dshift = (int)((final_width + 7) & 7);
+ sshift = (int)((row_info->width + 7) & 0x07);
+ dshift = (int)((final_width + 7) & 0x07);
s_start = 7;
s_end = 0;
s_inc = -1;
else
#endif
{
- sshift = 7 - (int)((row_info->width + 7) & 7);
- dshift = 7 - (int)((final_width + 7) & 7);
+ sshift = 7 - (int)((row_info->width + 7) & 0x07);
+ dshift = 7 - (int)((final_width + 7) & 0x07);
s_start = 0;
s_end = 7;
s_inc = 1;
for (i = 0; i < row_info->width; i++)
{
- v = (png_byte)((*sp >> sshift) & 0x1);
+ v = (png_byte)((*sp >> sshift) & 0x01);
for (j = 0; j < jstop; j++)
{
*dp &= (png_byte)((0x7f7f >> (7 - dshift)) & 0xff);
#if defined(PNG_READ_PACKSWAP_SUPPORTED)
if (transformations & PNG_PACKSWAP)
{
- sshift = (int)(((row_info->width + 3) & 3) << 1);
- dshift = (int)(((final_width + 3) & 3) << 1);
+ sshift = (int)(((row_info->width + 3) & 0x03) << 1);
+ dshift = (int)(((final_width + 3) & 0x03) << 1);
s_start = 6;
s_end = 0;
s_inc = -2;
else
#endif
{
- sshift = (int)((3 - ((row_info->width + 3) & 3)) << 1);
- dshift = (int)((3 - ((final_width + 3) & 3)) << 1);
+ sshift = (int)((3 - ((row_info->width + 3) & 0x03)) << 1);
+ dshift = (int)((3 - ((final_width + 3) & 0x03)) << 1);
s_start = 0;
s_end = 6;
s_inc = 2;
png_byte v;
int j;
- v = (png_byte)((*sp >> sshift) & 0x3);
+ v = (png_byte)((*sp >> sshift) & 0x03);
for (j = 0; j < jstop; j++)
{
*dp &= (png_byte)((0x3f3f >> (6 - dshift)) & 0xff);
#if defined(PNG_READ_PACKSWAP_SUPPORTED)
if (transformations & PNG_PACKSWAP)
{
- sshift = (int)(((row_info->width + 1) & 1) << 2);
- dshift = (int)(((final_width + 1) & 1) << 2);
+ sshift = (int)(((row_info->width + 1) & 0x01) << 2);
+ dshift = (int)(((final_width + 1) & 0x01) << 2);
s_start = 4;
s_end = 0;
s_inc = -4;
else
#endif
{
- sshift = (int)((1 - ((row_info->width + 1) & 1)) << 2);
- dshift = (int)((1 - ((final_width + 1) & 1)) << 2);
+ sshift = (int)((1 - ((row_info->width + 1) & 0x01)) << 2);
+ dshift = (int)((1 - ((final_width + 1) & 0x01)) << 2);
s_start = 0;
s_end = 4;
s_inc = 4;
png_size_t pixel_bytes = (row_info->pixel_depth >> 3);
png_bytep sp = row + (png_size_t)(row_info->width - 1) * pixel_bytes;
png_bytep dp = row + (png_size_t)(final_width - 1) * pixel_bytes;
+
int jstop = png_pass_inc[pass];
png_uint_32 i;
row_info->rowbytes = ((final_width *
(png_uint_32)row_info->pixel_depth + 7) >> 3);
}
-}
+#if !defined(PNG_READ_PACKSWAP_SUPPORTED)
+ transformations = transformations; /* silence compiler warning */
#endif
+}
+#endif /* !PNG_HAVE_ASSEMBLER_READ_INTERLACE */
+#endif /* PNG_READ_INTERLACING_SUPPORTED */
-void
+#ifndef PNG_HAVE_ASSEMBLER_READ_FILTER_ROW
+void /* PRIVATE */
png_read_filter_row(png_structp png_ptr, png_row_infop row_info, png_bytep row,
png_bytep prev_row, int filter)
{
png_debug(1, "in png_read_filter_row\n");
- png_debug2(2,"row = %d, filter = %d\n", png_ptr->row_number, filter);
-
-
+ png_debug2(2,"row = %lu, filter = %d\n", png_ptr->row_number, filter);
switch (filter)
{
case PNG_FILTER_VALUE_NONE:
{
png_uint_32 i;
png_uint_32 istop = row_info->rowbytes;
- png_uint_32 bpp = (row_info->pixel_depth + 7) / 8;
+ png_uint_32 bpp = (row_info->pixel_depth + 7) >> 3;
png_bytep rp = row + bpp;
png_bytep lp = row;
png_bytep rp = row;
png_bytep pp = prev_row;
png_bytep lp = row;
- png_uint_32 bpp = (row_info->pixel_depth + 7) / 8;
+ png_uint_32 bpp = (row_info->pixel_depth + 7) >> 3;
png_uint_32 istop = row_info->rowbytes - bpp;
for (i = 0; i < bpp; i++)
{
*rp = (png_byte)(((int)(*rp) +
- ((int)(*pp++) / 2)) & 0xff);
+ ((int)(*pp++) / 2 )) & 0xff);
rp++;
}
for (i = 0; i < istop; i++)
{
*rp = (png_byte)(((int)(*rp) +
- (int)(*pp++ + *lp++) / 2) & 0xff);
+ (int)(*pp++ + *lp++) / 2 ) & 0xff);
rp++;
}
break;
png_bytep pp = prev_row;
png_bytep lp = row;
png_bytep cp = prev_row;
- png_uint_32 bpp = (row_info->pixel_depth + 7) / 8;
+ png_uint_32 bpp = (row_info->pixel_depth + 7) >> 3;
png_uint_32 istop=row_info->rowbytes - bpp;
for (i = 0; i < bpp; i++)
break;
}
}
+#endif /* !PNG_HAVE_ASSEMBLER_READ_FILTER_ROW */
-void
+void /* PRIVATE */
png_read_finish_row(png_structp png_ptr)
{
+#ifdef PNG_USE_LOCAL_ARRAYS
+ /* arrays to facilitate easy interlacing - use pass (0 - 6) as index */
+
+ /* start of interlace block */
+ const int png_pass_start[7] = {0, 4, 0, 2, 0, 1, 0};
+
+ /* offset to next interlace block */
+ const int png_pass_inc[7] = {8, 8, 4, 4, 2, 2, 1};
+
+ /* start of interlace block in the y direction */
+ const int png_pass_ystart[7] = {0, 0, 4, 0, 2, 0, 1};
+
+ /* offset to next interlace block in the y direction */
+ const int png_pass_yinc[7] = {8, 8, 8, 4, 4, 2, 2};
+#endif
+
png_debug(1, "in png_read_finish_row\n");
png_ptr->row_number++;
if (png_ptr->row_number < png_ptr->num_rows)
if (!(png_ptr->flags & PNG_FLAG_ZLIB_FINISHED))
{
+#ifdef PNG_USE_LOCAL_ARRAYS
+ PNG_IDAT;
+#endif
char extra;
int ret;
png_reset_crc(png_ptr);
png_crc_read(png_ptr, png_ptr->chunk_name, 4);
- if (png_memcmp(png_ptr->chunk_name, png_IDAT, 4))
+ if (png_memcmp(png_ptr->chunk_name, (png_bytep)png_IDAT, 4))
png_error(png_ptr, "Not enough image data");
}
png_ptr->mode |= PNG_AFTER_IDAT;
}
-void
+void /* PRIVATE */
png_read_start_row(png_structp png_ptr)
{
+#ifdef PNG_USE_LOCAL_ARRAYS
+ /* arrays to facilitate easy interlacing - use pass (0 - 6) as index */
+
+ /* start of interlace block */
+ const int png_pass_start[7] = {0, 4, 0, 2, 0, 1, 0};
+
+ /* offset to next interlace block */
+ const int png_pass_inc[7] = {8, 8, 4, 4, 2, 2, 1};
+
+ /* start of interlace block in the y direction */
+ const int png_pass_ystart[7] = {0, 0, 4, 0, 2, 0, 1};
+
+ /* offset to next interlace block in the y direction */
+ const int png_pass_yinc[7] = {8, 8, 8, 4, 4, 2, 2};
+#endif
+
int max_pixel_depth;
png_uint_32 row_bytes;
else
{
if (max_pixel_depth <= 8)
- max_pixel_depth = 24;
+ {
+ if (png_ptr->color_type == PNG_COLOR_TYPE_RGB_ALPHA)
+ max_pixel_depth = 32;
+ else
+ max_pixel_depth = 24;
+ }
+ else if (png_ptr->color_type == PNG_COLOR_TYPE_RGB_ALPHA)
+ max_pixel_depth = 64;
else
max_pixel_depth = 48;
}
}
#endif
+#if defined(PNG_READ_USER_TRANSFORM_SUPPORTED) && \
+defined(PNG_USER_TRANSFORM_PTR_SUPPORTED)
+ if(png_ptr->transformations & PNG_USER_TRANSFORM)
+ {
+ int user_pixel_depth=png_ptr->user_transform_depth*
+ png_ptr->user_transform_channels;
+ if(user_pixel_depth > max_pixel_depth)
+ max_pixel_depth=user_pixel_depth;
+ }
+#endif
+
/* align the width on the next larger 8 pixels. Mainly used
for interlacing */
row_bytes = ((png_ptr->width + 7) & ~((png_uint_32)7));
if (row_bytes > (png_uint_32)65536L)
png_error(png_ptr, "This image requires a row greater than 64KB");
#endif
- png_ptr->row_buf = (png_bytep)png_malloc(png_ptr, row_bytes);
+ png_ptr->big_row_buf = (png_bytep)png_malloc(png_ptr, row_bytes+64);
+ png_ptr->row_buf = png_ptr->big_row_buf+32;
+#if defined(PNG_DEBUG) && defined(PNG_USE_PNGGCCRD)
+ png_ptr->row_buf_size = row_bytes;
+#endif
#ifdef PNG_MAX_MALLOC_64K
if ((png_uint_32)png_ptr->rowbytes + 1 > (png_uint_32)65536L)
png_memset_check(png_ptr, png_ptr->prev_row, 0, png_ptr->rowbytes + 1);
- png_debug1(3, "width = %d,\n", png_ptr->width);
- png_debug1(3, "height = %d,\n", png_ptr->height);
- png_debug1(3, "iwidth = %d,\n", png_ptr->iwidth);
- png_debug1(3, "num_rows = %d\n", png_ptr->num_rows);
- png_debug1(3, "rowbytes = %d,\n", png_ptr->rowbytes);
- png_debug1(3, "irowbytes = %d,\n", png_ptr->irowbytes);
+ png_debug1(3, "width = %lu,\n", png_ptr->width);
+ png_debug1(3, "height = %lu,\n", png_ptr->height);
+ png_debug1(3, "iwidth = %lu,\n", png_ptr->iwidth);
+ png_debug1(3, "num_rows = %lu\n", png_ptr->num_rows);
+ png_debug1(3, "rowbytes = %lu,\n", png_ptr->rowbytes);
+ png_debug1(3, "irowbytes = %lu,\n", png_ptr->irowbytes);
png_ptr->flags |= PNG_FLAG_ROW_INIT;
}
/* pngset.c - storage of image information into info struct
*
- * libpng 1.0.3 - January 14, 1999
+ * libpng 1.2.4 - July 8, 2002
* For conditions of distribution and use, see copyright notice in png.h
- * Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.
- * Copyright (c) 1996, 1997 Andreas Dilger
- * Copyright (c) 1998, 1999 Glenn Randers-Pehrson
+ * Copyright (c) 1998-2002 Glenn Randers-Pehrson
+ * (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger)
+ * (Version 0.88 Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.)
*
* The functions here are used during reads to store data from the file
* into the info struct, and during writes to store application data
#define PNG_INTERNAL
#include "png.h"
-#if defined(PNG_READ_bKGD_SUPPORTED) || defined(PNG_WRITE_bKGD_SUPPORTED)
-void
+#if defined(PNG_bKGD_SUPPORTED)
+void PNGAPI
png_set_bKGD(png_structp png_ptr, png_infop info_ptr, png_color_16p background)
{
png_debug1(1, "in %s storage function\n", "bKGD");
}
#endif
-#if defined(PNG_READ_cHRM_SUPPORTED) || defined(PNG_WRITE_cHRM_SUPPORTED)
-void
+#if defined(PNG_cHRM_SUPPORTED)
+#ifdef PNG_FLOATING_POINT_SUPPORTED
+void PNGAPI
png_set_cHRM(png_structp png_ptr, png_infop info_ptr,
double white_x, double white_y, double red_x, double red_y,
double green_x, double green_y, double blue_x, double blue_y)
if (png_ptr == NULL || info_ptr == NULL)
return;
+ if (white_x < 0.0 || white_y < 0.0 ||
+ red_x < 0.0 || red_y < 0.0 ||
+ green_x < 0.0 || green_y < 0.0 ||
+ blue_x < 0.0 || blue_y < 0.0)
+ {
+ png_warning(png_ptr,
+ "Ignoring attempt to set negative chromaticity value");
+ return;
+ }
+ if (white_x > 21474.83 || white_y > 21474.83 ||
+ red_x > 21474.83 || red_y > 21474.83 ||
+ green_x > 21474.83 || green_y > 21474.83 ||
+ blue_x > 21474.83 || blue_y > 21474.83)
+ {
+ png_warning(png_ptr,
+ "Ignoring attempt to set chromaticity value exceeding 21474.83");
+ return;
+ }
+
info_ptr->x_white = (float)white_x;
info_ptr->y_white = (float)white_y;
info_ptr->x_red = (float)red_x;
info_ptr->y_green = (float)green_y;
info_ptr->x_blue = (float)blue_x;
info_ptr->y_blue = (float)blue_y;
+#ifdef PNG_FIXED_POINT_SUPPORTED
+ info_ptr->int_x_white = (png_fixed_point)(white_x*100000.+0.5);
+ info_ptr->int_y_white = (png_fixed_point)(white_y*100000.+0.5);
+ info_ptr->int_x_red = (png_fixed_point)( red_x*100000.+0.5);
+ info_ptr->int_y_red = (png_fixed_point)( red_y*100000.+0.5);
+ info_ptr->int_x_green = (png_fixed_point)(green_x*100000.+0.5);
+ info_ptr->int_y_green = (png_fixed_point)(green_y*100000.+0.5);
+ info_ptr->int_x_blue = (png_fixed_point)( blue_x*100000.+0.5);
+ info_ptr->int_y_blue = (png_fixed_point)( blue_y*100000.+0.5);
+#endif
info_ptr->valid |= PNG_INFO_cHRM;
}
#endif
+#ifdef PNG_FIXED_POINT_SUPPORTED
+void PNGAPI
+png_set_cHRM_fixed(png_structp png_ptr, png_infop info_ptr,
+ png_fixed_point white_x, png_fixed_point white_y, png_fixed_point red_x,
+ png_fixed_point red_y, png_fixed_point green_x, png_fixed_point green_y,
+ png_fixed_point blue_x, png_fixed_point blue_y)
+{
+ png_debug1(1, "in %s storage function\n", "cHRM");
+ if (png_ptr == NULL || info_ptr == NULL)
+ return;
-#if defined(PNG_READ_gAMA_SUPPORTED) || defined(PNG_WRITE_gAMA_SUPPORTED)
-void
+ if (white_x < 0 || white_y < 0 ||
+ red_x < 0 || red_y < 0 ||
+ green_x < 0 || green_y < 0 ||
+ blue_x < 0 || blue_y < 0)
+ {
+ png_warning(png_ptr,
+ "Ignoring attempt to set negative chromaticity value");
+ return;
+ }
+ if (white_x > (double) PNG_MAX_UINT || white_y > (double) PNG_MAX_UINT ||
+ red_x > (double) PNG_MAX_UINT || red_y > (double) PNG_MAX_UINT ||
+ green_x > (double) PNG_MAX_UINT || green_y > (double) PNG_MAX_UINT ||
+ blue_x > (double) PNG_MAX_UINT || blue_y > (double) PNG_MAX_UINT)
+ {
+ png_warning(png_ptr,
+ "Ignoring attempt to set chromaticity value exceeding 21474.83");
+ return;
+ }
+ info_ptr->int_x_white = white_x;
+ info_ptr->int_y_white = white_y;
+ info_ptr->int_x_red = red_x;
+ info_ptr->int_y_red = red_y;
+ info_ptr->int_x_green = green_x;
+ info_ptr->int_y_green = green_y;
+ info_ptr->int_x_blue = blue_x;
+ info_ptr->int_y_blue = blue_y;
+#ifdef PNG_FLOATING_POINT_SUPPORTED
+ info_ptr->x_white = (float)(white_x/100000.);
+ info_ptr->y_white = (float)(white_y/100000.);
+ info_ptr->x_red = (float)( red_x/100000.);
+ info_ptr->y_red = (float)( red_y/100000.);
+ info_ptr->x_green = (float)(green_x/100000.);
+ info_ptr->y_green = (float)(green_y/100000.);
+ info_ptr->x_blue = (float)( blue_x/100000.);
+ info_ptr->y_blue = (float)( blue_y/100000.);
+#endif
+ info_ptr->valid |= PNG_INFO_cHRM;
+}
+#endif
+#endif
+
+#if defined(PNG_gAMA_SUPPORTED)
+#ifdef PNG_FLOATING_POINT_SUPPORTED
+void PNGAPI
png_set_gAMA(png_structp png_ptr, png_infop info_ptr, double file_gamma)
{
+ double gamma;
+ png_debug1(1, "in %s storage function\n", "gAMA");
+ if (png_ptr == NULL || info_ptr == NULL)
+ return;
+
+ /* Check for overflow */
+ if (file_gamma > 21474.83)
+ {
+ png_warning(png_ptr, "Limiting gamma to 21474.83");
+ gamma=21474.83;
+ }
+ else
+ gamma=file_gamma;
+ info_ptr->gamma = (float)gamma;
+#ifdef PNG_FIXED_POINT_SUPPORTED
+ info_ptr->int_gamma = (int)(gamma*100000.+.5);
+#endif
+ info_ptr->valid |= PNG_INFO_gAMA;
+ if(gamma == 0.0)
+ png_warning(png_ptr, "Setting gamma=0");
+}
+#endif
+void PNGAPI
+png_set_gAMA_fixed(png_structp png_ptr, png_infop info_ptr, png_fixed_point
+ int_gamma)
+{
+ png_fixed_point gamma;
+
png_debug1(1, "in %s storage function\n", "gAMA");
if (png_ptr == NULL || info_ptr == NULL)
return;
- info_ptr->gamma = (float)file_gamma;
+ if (int_gamma > (png_fixed_point) PNG_MAX_UINT)
+ {
+ png_warning(png_ptr, "Limiting gamma to 21474.83");
+ gamma=PNG_MAX_UINT;
+ }
+ else
+ {
+ if (int_gamma < 0)
+ {
+ png_warning(png_ptr, "Setting negative gamma to zero");
+ gamma=0;
+ }
+ else
+ gamma=int_gamma;
+ }
+#ifdef PNG_FLOATING_POINT_SUPPORTED
+ info_ptr->gamma = (float)(gamma/100000.);
+#endif
+#ifdef PNG_FIXED_POINT_SUPPORTED
+ info_ptr->int_gamma = gamma;
+#endif
info_ptr->valid |= PNG_INFO_gAMA;
+ if(gamma == 0)
+ png_warning(png_ptr, "Setting gamma=0");
}
#endif
-#if defined(PNG_READ_hIST_SUPPORTED) || defined(PNG_WRITE_hIST_SUPPORTED)
-void
+#if defined(PNG_hIST_SUPPORTED)
+void PNGAPI
png_set_hIST(png_structp png_ptr, png_infop info_ptr, png_uint_16p hist)
{
+ int i;
+
png_debug1(1, "in %s storage function\n", "hIST");
if (png_ptr == NULL || info_ptr == NULL)
return;
+ if (info_ptr->num_palette == 0)
+ {
+ png_warning(png_ptr,
+ "Palette size 0, hIST allocation skipped.");
+ return;
+ }
+
+#ifdef PNG_FREE_ME_SUPPORTED
+ png_free_data(png_ptr, info_ptr, PNG_FREE_HIST, 0);
+#endif
+ /* Changed from info->num_palette to 256 in version 1.2.1 */
+ png_ptr->hist = (png_uint_16p)png_malloc_warn(png_ptr,
+ (png_uint_32)(256 * sizeof (png_uint_16)));
+ if (png_ptr->hist == NULL)
+ {
+ png_warning(png_ptr, "Insufficient memory for hIST chunk data.");
+ return;
+ }
- info_ptr->hist = hist;
+ for (i = 0; i < info_ptr->num_palette; i++)
+ png_ptr->hist[i] = hist[i];
+ info_ptr->hist = png_ptr->hist;
info_ptr->valid |= PNG_INFO_hIST;
+
+#ifdef PNG_FREE_ME_SUPPORTED
+ info_ptr->free_me |= PNG_FREE_HIST;
+#else
+ png_ptr->flags |= PNG_FLAG_FREE_HIST;
+#endif
}
#endif
-void
+void PNGAPI
png_set_IHDR(png_structp png_ptr, png_infop info_ptr,
png_uint_32 width, png_uint_32 height, int bit_depth,
int color_type, int interlace_type, int compression_type,
if (png_ptr == NULL || info_ptr == NULL)
return;
+ /* check for width and height valid values */
+ if (width == 0 || height == 0)
+ png_error(png_ptr, "Image width or height is zero in IHDR");
+ if (width > PNG_MAX_UINT || height > PNG_MAX_UINT)
+ png_error(png_ptr, "Invalid image size in IHDR");
+
+ /* check other values */
+ if (bit_depth != 1 && bit_depth != 2 && bit_depth != 4 &&
+ bit_depth != 8 && bit_depth != 16)
+ png_error(png_ptr, "Invalid bit depth in IHDR");
+
+ if (color_type < 0 || color_type == 1 ||
+ color_type == 5 || color_type > 6)
+ png_error(png_ptr, "Invalid color type in IHDR");
+
+ if (((color_type == PNG_COLOR_TYPE_PALETTE) && bit_depth > 8) ||
+ ((color_type == PNG_COLOR_TYPE_RGB ||
+ color_type == PNG_COLOR_TYPE_GRAY_ALPHA ||
+ color_type == PNG_COLOR_TYPE_RGB_ALPHA) && bit_depth < 8))
+ png_error(png_ptr, "Invalid color type/bit depth combination in IHDR");
+
+ if (interlace_type >= PNG_INTERLACE_LAST)
+ png_error(png_ptr, "Unknown interlace method in IHDR");
+
+ if (compression_type != PNG_COMPRESSION_TYPE_BASE)
+ png_error(png_ptr, "Unknown compression method in IHDR");
+
+#if defined(PNG_MNG_FEATURES_SUPPORTED)
+ /* Accept filter_method 64 (intrapixel differencing) only if
+ * 1. Libpng was compiled with PNG_MNG_FEATURES_SUPPORTED and
+ * 2. Libpng did not read a PNG signature (this filter_method is only
+ * used in PNG datastreams that are embedded in MNG datastreams) and
+ * 3. The application called png_permit_mng_features with a mask that
+ * included PNG_FLAG_MNG_FILTER_64 and
+ * 4. The filter_method is 64 and
+ * 5. The color_type is RGB or RGBA
+ */
+ if((png_ptr->mode&PNG_HAVE_PNG_SIGNATURE)&&png_ptr->mng_features_permitted)
+ png_warning(png_ptr,"MNG features are not allowed in a PNG datastream\n");
+ if(filter_type != PNG_FILTER_TYPE_BASE)
+ {
+ if(!((png_ptr->mng_features_permitted & PNG_FLAG_MNG_FILTER_64) &&
+ (filter_type == PNG_INTRAPIXEL_DIFFERENCING) &&
+ ((png_ptr->mode&PNG_HAVE_PNG_SIGNATURE) == 0) &&
+ (color_type == PNG_COLOR_TYPE_RGB ||
+ color_type == PNG_COLOR_TYPE_RGB_ALPHA)))
+ png_error(png_ptr, "Unknown filter method in IHDR");
+ if(png_ptr->mode&PNG_HAVE_PNG_SIGNATURE)
+ png_warning(png_ptr, "Invalid filter method in IHDR");
+ }
+#else
+ if(filter_type != PNG_FILTER_TYPE_BASE)
+ png_error(png_ptr, "Unknown filter method in IHDR");
+#endif
+
info_ptr->width = width;
info_ptr->height = height;
info_ptr->bit_depth = (png_byte)bit_depth;
/* check for overflow */
rowbytes_per_pixel = (info_ptr->pixel_depth + 7) >> 3;
- if (( width > (png_uint_32)2147483647L/rowbytes_per_pixel))
+ if ( width > PNG_MAX_UINT/rowbytes_per_pixel - 64)
{
png_warning(png_ptr,
"Width too large to process image data; rowbytes will overflow.");
info_ptr->rowbytes = (info_ptr->width * info_ptr->pixel_depth + 7) >> 3;
}
-#if defined(PNG_READ_oFFs_SUPPORTED) || defined(PNG_WRITE_oFFs_SUPPORTED)
-void
+#if defined(PNG_oFFs_SUPPORTED)
+void PNGAPI
png_set_oFFs(png_structp png_ptr, png_infop info_ptr,
- png_uint_32 offset_x, png_uint_32 offset_y, int unit_type)
+ png_int_32 offset_x, png_int_32 offset_y, int unit_type)
{
png_debug1(1, "in %s storage function\n", "oFFs");
if (png_ptr == NULL || info_ptr == NULL)
}
#endif
-#if defined(PNG_READ_pCAL_SUPPORTED) || defined(PNG_WRITE_pCAL_SUPPORTED)
-void
+#if defined(PNG_pCAL_SUPPORTED)
+void PNGAPI
png_set_pCAL(png_structp png_ptr, png_infop info_ptr,
png_charp purpose, png_int_32 X0, png_int_32 X1, int type, int nparams,
png_charp units, png_charpp params)
return;
length = png_strlen(purpose) + 1;
- png_debug1(3, "allocating purpose for info (%d bytes)\n", length);
- info_ptr->pcal_purpose = (png_charp)png_malloc(png_ptr, length);
+ png_debug1(3, "allocating purpose for info (%lu bytes)\n", length);
+ info_ptr->pcal_purpose = (png_charp)png_malloc_warn(png_ptr, length);
+ if (info_ptr->pcal_purpose == NULL)
+ {
+ png_warning(png_ptr, "Insufficient memory for pCAL purpose.");
+ return;
+ }
png_memcpy(info_ptr->pcal_purpose, purpose, (png_size_t)length);
png_debug(3, "storing X0, X1, type, and nparams in info\n");
info_ptr->pcal_nparams = (png_byte)nparams;
length = png_strlen(units) + 1;
- png_debug1(3, "allocating units for info (%d bytes)\n", length);
- info_ptr->pcal_units = (png_charp)png_malloc(png_ptr, length);
+ png_debug1(3, "allocating units for info (%lu bytes)\n", length);
+ info_ptr->pcal_units = (png_charp)png_malloc_warn(png_ptr, length);
+ if (info_ptr->pcal_units == NULL)
+ {
+ png_warning(png_ptr, "Insufficient memory for pCAL units.");
+ return;
+ }
png_memcpy(info_ptr->pcal_units, units, (png_size_t)length);
- info_ptr->pcal_params = (png_charpp)png_malloc(png_ptr,
+ info_ptr->pcal_params = (png_charpp)png_malloc_warn(png_ptr,
(png_uint_32)((nparams + 1) * sizeof(png_charp)));
+ if (info_ptr->pcal_params == NULL)
+ {
+ png_warning(png_ptr, "Insufficient memory for pCAL params.");
+ return;
+ }
+
info_ptr->pcal_params[nparams] = NULL;
for (i = 0; i < nparams; i++)
{
length = png_strlen(params[i]) + 1;
- png_debug2(3, "allocating parameter %d for info (%d bytes)\n", i, length);
- info_ptr->pcal_params[i] = (png_charp)png_malloc(png_ptr, length);
+ png_debug2(3, "allocating parameter %d for info (%lu bytes)\n", i, length);
+ info_ptr->pcal_params[i] = (png_charp)png_malloc_warn(png_ptr, length);
+ if (info_ptr->pcal_params[i] == NULL)
+ {
+ png_warning(png_ptr, "Insufficient memory for pCAL parameter.");
+ return;
+ }
png_memcpy(info_ptr->pcal_params[i], params[i], (png_size_t)length);
}
info_ptr->valid |= PNG_INFO_pCAL;
+#ifdef PNG_FREE_ME_SUPPORTED
+ info_ptr->free_me |= PNG_FREE_PCAL;
+#endif
+}
+#endif
+
+#if defined(PNG_READ_sCAL_SUPPORTED) || defined(PNG_WRITE_sCAL_SUPPORTED)
+#ifdef PNG_FLOATING_POINT_SUPPORTED
+void PNGAPI
+png_set_sCAL(png_structp png_ptr, png_infop info_ptr,
+ int unit, double width, double height)
+{
+ png_debug1(1, "in %s storage function\n", "sCAL");
+ if (png_ptr == NULL || info_ptr == NULL)
+ return;
+
+ info_ptr->scal_unit = (png_byte)unit;
+ info_ptr->scal_pixel_width = width;
+ info_ptr->scal_pixel_height = height;
+
+ info_ptr->valid |= PNG_INFO_sCAL;
+}
+#else
+#ifdef PNG_FIXED_POINT_SUPPORTED
+void PNGAPI
+png_set_sCAL_s(png_structp png_ptr, png_infop info_ptr,
+ int unit, png_charp swidth, png_charp sheight)
+{
+ png_uint_32 length;
+
+ png_debug1(1, "in %s storage function\n", "sCAL");
+ if (png_ptr == NULL || info_ptr == NULL)
+ return;
+
+ info_ptr->scal_unit = (png_byte)unit;
+
+ length = png_strlen(swidth) + 1;
+ png_debug1(3, "allocating unit for info (%d bytes)\n", length);
+ info_ptr->scal_s_width = (png_charp)png_malloc(png_ptr, length);
+ png_memcpy(info_ptr->scal_s_width, swidth, (png_size_t)length);
+
+ length = png_strlen(sheight) + 1;
+ png_debug1(3, "allocating unit for info (%d bytes)\n", length);
+ info_ptr->scal_s_height = (png_charp)png_malloc(png_ptr, length);
+ png_memcpy(info_ptr->scal_s_height, sheight, (png_size_t)length);
+
+ info_ptr->valid |= PNG_INFO_sCAL;
+#ifdef PNG_FREE_ME_SUPPORTED
+ info_ptr->free_me |= PNG_FREE_SCAL;
+#endif
}
#endif
+#endif
+#endif
-#if defined(PNG_READ_pHYs_SUPPORTED) || defined(PNG_WRITE_pHYs_SUPPORTED)
-void
+#if defined(PNG_pHYs_SUPPORTED)
+void PNGAPI
png_set_pHYs(png_structp png_ptr, png_infop info_ptr,
png_uint_32 res_x, png_uint_32 res_y, int unit_type)
{
}
#endif
-void
+void PNGAPI
png_set_PLTE(png_structp png_ptr, png_infop info_ptr,
png_colorp palette, int num_palette)
{
+
png_debug1(1, "in %s storage function\n", "PLTE");
if (png_ptr == NULL || info_ptr == NULL)
return;
- info_ptr->palette = palette;
- info_ptr->num_palette = (png_uint_16)num_palette;
+ /*
+ * It may not actually be necessary to set png_ptr->palette here;
+ * we do it for backward compatibility with the way the png_handle_tRNS
+ * function used to do the allocation.
+ */
+#ifdef PNG_FREE_ME_SUPPORTED
+ png_free_data(png_ptr, info_ptr, PNG_FREE_PLTE, 0);
+#endif
+ /* Changed in libpng-1.2.1 to allocate 256 instead of num_palette entries,
+ in case of an invalid PNG file that has too-large sample values. */
+ png_ptr->palette = (png_colorp)png_zalloc(png_ptr, (uInt)256,
+ sizeof (png_color));
+ if (png_ptr->palette == NULL)
+ png_error(png_ptr, "Unable to malloc palette");
+ png_memcpy(png_ptr->palette, palette, num_palette * sizeof (png_color));
+ info_ptr->palette = png_ptr->palette;
+ info_ptr->num_palette = png_ptr->num_palette = (png_uint_16)num_palette;
+
+#ifdef PNG_FREE_ME_SUPPORTED
+ info_ptr->free_me |= PNG_FREE_PLTE;
+#else
+ png_ptr->flags |= PNG_FLAG_FREE_PLTE;
+#endif
+
info_ptr->valid |= PNG_INFO_PLTE;
}
-#if defined(PNG_READ_sBIT_SUPPORTED) || defined(PNG_WRITE_sBIT_SUPPORTED)
-void
+#if defined(PNG_sBIT_SUPPORTED)
+void PNGAPI
png_set_sBIT(png_structp png_ptr, png_infop info_ptr,
png_color_8p sig_bit)
{
}
#endif
-#if defined(PNG_READ_sRGB_SUPPORTED) || defined(PNG_WRITE_sRGB_SUPPORTED)
-void
+#if defined(PNG_sRGB_SUPPORTED)
+void PNGAPI
png_set_sRGB(png_structp png_ptr, png_infop info_ptr, int intent)
{
png_debug1(1, "in %s storage function\n", "sRGB");
info_ptr->srgb_intent = (png_byte)intent;
info_ptr->valid |= PNG_INFO_sRGB;
}
-void
+
+void PNGAPI
png_set_sRGB_gAMA_and_cHRM(png_structp png_ptr, png_infop info_ptr,
int intent)
{
-#if defined(PNG_READ_gAMA_SUPPORTED) || defined(PNG_WRITE_gAMA_SUPPORTED)
+#if defined(PNG_gAMA_SUPPORTED)
+#ifdef PNG_FLOATING_POINT_SUPPORTED
float file_gamma;
#endif
-#if defined(PNG_READ_cHRM_SUPPORTED) || defined(PNG_WRITE_cHRM_SUPPORTED)
+#ifdef PNG_FIXED_POINT_SUPPORTED
+ png_fixed_point int_file_gamma;
+#endif
+#endif
+#if defined(PNG_cHRM_SUPPORTED)
+#ifdef PNG_FLOATING_POINT_SUPPORTED
float white_x, white_y, red_x, red_y, green_x, green_y, blue_x, blue_y;
+#endif
+#ifdef PNG_FIXED_POINT_SUPPORTED
+ png_fixed_point int_white_x, int_white_y, int_red_x, int_red_y, int_green_x,
+ int_green_y, int_blue_x, int_blue_y;
+#endif
#endif
png_debug1(1, "in %s storage function\n", "sRGB_gAMA_and_cHRM");
if (png_ptr == NULL || info_ptr == NULL)
png_set_sRGB(png_ptr, info_ptr, intent);
-#if defined(PNG_READ_gAMA_SUPPORTED) || defined(PNG_WRITE_gAMA_SUPPORTED)
- file_gamma = (float).45;
+#if defined(PNG_gAMA_SUPPORTED)
+#ifdef PNG_FLOATING_POINT_SUPPORTED
+ file_gamma = (float).45455;
png_set_gAMA(png_ptr, info_ptr, file_gamma);
#endif
+#ifdef PNG_FIXED_POINT_SUPPORTED
+ int_file_gamma = 45455L;
+ png_set_gAMA_fixed(png_ptr, info_ptr, int_file_gamma);
+#endif
+#endif
+
+#if defined(PNG_cHRM_SUPPORTED)
+#ifdef PNG_FIXED_POINT_SUPPORTED
+ int_white_x = 31270L;
+ int_white_y = 32900L;
+ int_red_x = 64000L;
+ int_red_y = 33000L;
+ int_green_x = 30000L;
+ int_green_y = 60000L;
+ int_blue_x = 15000L;
+ int_blue_y = 6000L;
-#if defined(PNG_READ_cHRM_SUPPORTED) || defined(PNG_WRITE_cHRM_SUPPORTED)
+ png_set_cHRM_fixed(png_ptr, info_ptr,
+ int_white_x, int_white_y, int_red_x, int_red_y, int_green_x, int_green_y,
+ int_blue_x, int_blue_y);
+#endif
+#ifdef PNG_FLOATING_POINT_SUPPORTED
white_x = (float).3127;
white_y = (float).3290;
red_x = (float).64;
png_set_cHRM(png_ptr, info_ptr,
white_x, white_y, red_x, red_y, green_x, green_y, blue_x, blue_y);
+#endif
+#endif
+}
+#endif
+
+
+#if defined(PNG_iCCP_SUPPORTED)
+void PNGAPI
+png_set_iCCP(png_structp png_ptr, png_infop info_ptr,
+ png_charp name, int compression_type,
+ png_charp profile, png_uint_32 proflen)
+{
+ png_charp new_iccp_name;
+ png_charp new_iccp_profile;
+
+ png_debug1(1, "in %s storage function\n", "iCCP");
+ if (png_ptr == NULL || info_ptr == NULL || name == NULL || profile == NULL)
+ return;
+
+ new_iccp_name = (png_charp)png_malloc(png_ptr, png_strlen(name)+1);
+ png_strcpy(new_iccp_name, name);
+ new_iccp_profile = (png_charp)png_malloc(png_ptr, proflen);
+ png_memcpy(new_iccp_profile, profile, (png_size_t)proflen);
+
+ png_free_data(png_ptr, info_ptr, PNG_FREE_ICCP, 0);
+ info_ptr->iccp_proflen = proflen;
+ info_ptr->iccp_name = new_iccp_name;
+ info_ptr->iccp_profile = new_iccp_profile;
+ /* Compression is always zero but is here so the API and info structure
+ * does not have to change if we introduce multiple compression types */
+ info_ptr->iccp_compression = (png_byte)compression_type;
+#ifdef PNG_FREE_ME_SUPPORTED
+ info_ptr->free_me |= PNG_FREE_ICCP;
#endif
+ info_ptr->valid |= PNG_INFO_iCCP;
}
#endif
-#if defined(PNG_READ_tEXt_SUPPORTED) || defined(PNG_WRITE_tEXt_SUPPORTED) || \
- defined(PNG_READ_zTXt_SUPPORTED) || defined(PNG_WRITE_zTXt_SUPPORTED)
-void
+#if defined(PNG_TEXT_SUPPORTED)
+void PNGAPI
png_set_text(png_structp png_ptr, png_infop info_ptr, png_textp text_ptr,
int num_text)
+{
+ int ret;
+ ret=png_set_text_2(png_ptr, info_ptr, text_ptr, num_text);
+ if (ret)
+ png_error(png_ptr, "Insufficient memory to store text");
+}
+
+int /* PRIVATE */
+png_set_text_2(png_structp png_ptr, png_infop info_ptr, png_textp text_ptr,
+ int num_text)
{
int i;
"text" : (png_const_charp)png_ptr->chunk_name));
if (png_ptr == NULL || info_ptr == NULL || num_text == 0)
- return;
+ return(0);
/* Make sure we have enough space in the "text" array in info_struct
* to hold all of the incoming text_ptr objects.
old_max = info_ptr->max_text;
info_ptr->max_text = info_ptr->num_text + num_text + 8;
old_text = info_ptr->text;
- info_ptr->text = (png_textp)png_malloc(png_ptr,
+ info_ptr->text = (png_textp)png_malloc_warn(png_ptr,
(png_uint_32)(info_ptr->max_text * sizeof (png_text)));
+ if (info_ptr->text == NULL)
+ {
+ png_free(png_ptr, old_text);
+ return(1);
+ }
png_memcpy(info_ptr->text, old_text, (png_size_t)(old_max *
sizeof(png_text)));
png_free(png_ptr, old_text);
{
info_ptr->max_text = num_text + 8;
info_ptr->num_text = 0;
- info_ptr->text = (png_textp)png_malloc(png_ptr,
+ info_ptr->text = (png_textp)png_malloc_warn(png_ptr,
(png_uint_32)(info_ptr->max_text * sizeof (png_text)));
+ if (info_ptr->text == NULL)
+ return(1);
+#ifdef PNG_FREE_ME_SUPPORTED
+ info_ptr->free_me |= PNG_FREE_TEXT;
+#endif
}
png_debug1(3, "allocated %d entries for info_ptr->text\n",
info_ptr->max_text);
}
-
for (i = 0; i < num_text; i++)
{
+ png_size_t text_length,key_len;
+ png_size_t lang_len,lang_key_len;
png_textp textp = &(info_ptr->text[info_ptr->num_text]);
- if (text_ptr[i].text == NULL)
- text_ptr[i].text = (png_charp)"";
+ if (text_ptr[i].key == NULL)
+ continue;
+
+ key_len = png_strlen(text_ptr[i].key);
- if (text_ptr[i].text[0] == '\0')
+ if(text_ptr[i].compression <= 0)
{
- textp->text_length = 0;
- textp->compression = PNG_TEXT_COMPRESSION_NONE;
+ lang_len = 0;
+ lang_key_len = 0;
}
else
+#ifdef PNG_iTXt_SUPPORTED
+ {
+ /* set iTXt data */
+ if (text_ptr[i].lang != NULL)
+ lang_len = png_strlen(text_ptr[i].lang);
+ else
+ lang_len = 0;
+ if (text_ptr[i].lang_key != NULL)
+ lang_key_len = png_strlen(text_ptr[i].lang_key);
+ else
+ lang_key_len = 0;
+ }
+#else
+ {
+ png_warning(png_ptr, "iTXt chunk not supported.");
+ continue;
+ }
+#endif
+
+ if (text_ptr[i].text == NULL || text_ptr[i].text[0] == '\0')
{
- textp->text_length = png_strlen(text_ptr[i].text);
+ text_length = 0;
+#ifdef PNG_iTXt_SUPPORTED
+ if(text_ptr[i].compression > 0)
+ textp->compression = PNG_ITXT_COMPRESSION_NONE;
+ else
+#endif
+ textp->compression = PNG_TEXT_COMPRESSION_NONE;
+ }
+ else
+ {
+ text_length = png_strlen(text_ptr[i].text);
textp->compression = text_ptr[i].compression;
}
- textp->text = text_ptr[i].text;
- textp->key = text_ptr[i].key;
+
+ textp->key = (png_charp)png_malloc_warn(png_ptr,
+ (png_uint_32)(key_len + text_length + lang_len + lang_key_len + 4));
+ if (textp->key == NULL)
+ return(1);
+ png_debug2(2, "Allocated %lu bytes at %x in png_set_text\n",
+ (png_uint_32)(key_len + lang_len + lang_key_len + text_length + 4),
+ (int)textp->key);
+
+ png_memcpy(textp->key, text_ptr[i].key,
+ (png_size_t)(key_len));
+ *(textp->key+key_len) = '\0';
+#ifdef PNG_iTXt_SUPPORTED
+ if (text_ptr[i].compression > 0)
+ {
+ textp->lang=textp->key + key_len + 1;
+ png_memcpy(textp->lang, text_ptr[i].lang, lang_len);
+ *(textp->lang+lang_len) = '\0';
+ textp->lang_key=textp->lang + lang_len + 1;
+ png_memcpy(textp->lang_key, text_ptr[i].lang_key, lang_key_len);
+ *(textp->lang_key+lang_key_len) = '\0';
+ textp->text=textp->lang_key + lang_key_len + 1;
+ }
+ else
+#endif
+ {
+#ifdef PNG_iTXt_SUPPORTED
+ textp->lang=NULL;
+ textp->lang_key=NULL;
+#endif
+ textp->text=textp->key + key_len + 1;
+ }
+ if(text_length)
+ png_memcpy(textp->text, text_ptr[i].text,
+ (png_size_t)(text_length));
+ *(textp->text+text_length) = '\0';
+
+#ifdef PNG_iTXt_SUPPORTED
+ if(textp->compression > 0)
+ {
+ textp->text_length = 0;
+ textp->itxt_length = text_length;
+ }
+ else
+#endif
+ {
+ textp->text_length = text_length;
+#ifdef PNG_iTXt_SUPPORTED
+ textp->itxt_length = 0;
+#endif
+ }
+ info_ptr->text[info_ptr->num_text]= *textp;
info_ptr->num_text++;
png_debug1(3, "transferred text chunk %d\n", info_ptr->num_text);
}
+ return(0);
}
#endif
-#if defined(PNG_READ_tIME_SUPPORTED) || defined(PNG_WRITE_tIME_SUPPORTED)
-void
+#if defined(PNG_tIME_SUPPORTED)
+void PNGAPI
png_set_tIME(png_structp png_ptr, png_infop info_ptr, png_timep mod_time)
{
png_debug1(1, "in %s storage function\n", "tIME");
- if (png_ptr == NULL || info_ptr == NULL)
+ if (png_ptr == NULL || info_ptr == NULL ||
+ (png_ptr->mode & PNG_WROTE_tIME))
return;
png_memcpy(&(info_ptr->mod_time), mod_time, sizeof (png_time));
}
#endif
-#if defined(PNG_READ_tRNS_SUPPORTED) || defined(PNG_WRITE_tRNS_SUPPORTED)
-void
+#if defined(PNG_tRNS_SUPPORTED)
+void PNGAPI
png_set_tRNS(png_structp png_ptr, png_infop info_ptr,
png_bytep trans, int num_trans, png_color_16p trans_values)
{
if (trans != NULL)
{
- info_ptr->trans = trans;
+ /*
+ * It may not actually be necessary to set png_ptr->trans here;
+ * we do it for backward compatibility with the way the png_handle_tRNS
+ * function used to do the allocation.
+ */
+#ifdef PNG_FREE_ME_SUPPORTED
+ png_free_data(png_ptr, info_ptr, PNG_FREE_TRNS, 0);
+#endif
+ /* Changed from num_trans to 256 in version 1.2.1 */
+ png_ptr->trans = info_ptr->trans = (png_bytep)png_malloc(png_ptr,
+ (png_uint_32)256);
+ png_memcpy(info_ptr->trans, trans, (png_size_t)num_trans);
+#ifdef PNG_FREE_ME_SUPPORTED
+ info_ptr->free_me |= PNG_FREE_TRNS;
+#else
+ png_ptr->flags |= PNG_FLAG_FREE_TRNS;
+#endif
}
if (trans_values != NULL)
}
#endif
+#if defined(PNG_sPLT_SUPPORTED)
+void PNGAPI
+png_set_sPLT(png_structp png_ptr,
+ png_infop info_ptr, png_sPLT_tp entries, int nentries)
+{
+ png_sPLT_tp np;
+ int i;
+
+ np = (png_sPLT_tp)png_malloc_warn(png_ptr,
+ (info_ptr->splt_palettes_num + nentries) * sizeof(png_sPLT_t));
+ if (np == NULL)
+ {
+ png_warning(png_ptr, "No memory for sPLT palettes.");
+ return;
+ }
+
+ png_memcpy(np, info_ptr->splt_palettes,
+ info_ptr->splt_palettes_num * sizeof(png_sPLT_t));
+ png_free(png_ptr, info_ptr->splt_palettes);
+ info_ptr->splt_palettes=NULL;
+
+ for (i = 0; i < nentries; i++)
+ {
+ png_sPLT_tp to = np + info_ptr->splt_palettes_num + i;
+ png_sPLT_tp from = entries + i;
+
+ to->name = (png_charp)png_malloc(png_ptr,
+ png_strlen(from->name) + 1);
+ png_strcpy(to->name, from->name);
+ to->entries = (png_sPLT_entryp)png_malloc(png_ptr,
+ from->nentries * sizeof(png_sPLT_t));
+ png_memcpy(to->entries, from->entries,
+ from->nentries * sizeof(png_sPLT_t));
+ to->nentries = from->nentries;
+ to->depth = from->depth;
+ }
+
+ info_ptr->splt_palettes = np;
+ info_ptr->splt_palettes_num += nentries;
+ info_ptr->valid |= PNG_INFO_sPLT;
+#ifdef PNG_FREE_ME_SUPPORTED
+ info_ptr->free_me |= PNG_FREE_SPLT;
+#endif
+}
+#endif /* PNG_sPLT_SUPPORTED */
+
+#if defined(PNG_UNKNOWN_CHUNKS_SUPPORTED)
+void PNGAPI
+png_set_unknown_chunks(png_structp png_ptr,
+ png_infop info_ptr, png_unknown_chunkp unknowns, int num_unknowns)
+{
+ png_unknown_chunkp np;
+ int i;
+
+ if (png_ptr == NULL || info_ptr == NULL || num_unknowns == 0)
+ return;
+
+ np = (png_unknown_chunkp)png_malloc_warn(png_ptr,
+ (info_ptr->unknown_chunks_num + num_unknowns) *
+ sizeof(png_unknown_chunk));
+ if (np == NULL)
+ {
+ png_warning(png_ptr, "Out of memory while processing unknown chunk.");
+ return;
+ }
+
+ png_memcpy(np, info_ptr->unknown_chunks,
+ info_ptr->unknown_chunks_num * sizeof(png_unknown_chunk));
+ png_free(png_ptr, info_ptr->unknown_chunks);
+ info_ptr->unknown_chunks=NULL;
+
+ for (i = 0; i < num_unknowns; i++)
+ {
+ png_unknown_chunkp to = np + info_ptr->unknown_chunks_num + i;
+ png_unknown_chunkp from = unknowns + i;
+
+ png_strcpy((png_charp)to->name, (png_charp)from->name);
+ to->data = (png_bytep)png_malloc(png_ptr, from->size);
+ if (to->data == NULL)
+ png_warning(png_ptr, "Out of memory while processing unknown chunk.");
+ else
+ {
+ png_memcpy(to->data, from->data, from->size);
+ to->size = from->size;
+
+ /* note our location in the read or write sequence */
+ to->location = (png_byte)(png_ptr->mode & 0xff);
+ }
+ }
+
+ info_ptr->unknown_chunks = np;
+ info_ptr->unknown_chunks_num += num_unknowns;
+#ifdef PNG_FREE_ME_SUPPORTED
+ info_ptr->free_me |= PNG_FREE_UNKN;
+#endif
+}
+void PNGAPI
+png_set_unknown_chunk_location(png_structp png_ptr, png_infop info_ptr,
+ int chunk, int location)
+{
+ if(png_ptr != NULL && info_ptr != NULL && chunk >= 0 && chunk <
+ (int)info_ptr->unknown_chunks_num)
+ info_ptr->unknown_chunks[chunk].location = (png_byte)location;
+}
+#endif
+
+#if defined(PNG_READ_EMPTY_PLTE_SUPPORTED) || \
+ defined(PNG_WRITE_EMPTY_PLTE_SUPPORTED)
+void PNGAPI
+png_permit_empty_plte (png_structp png_ptr, int empty_plte_permitted)
+{
+ /* This function is deprecated in favor of png_permit_mng_features()
+ and will be removed from libpng-2.0.0 */
+ png_debug(1, "in png_permit_empty_plte, DEPRECATED.\n");
+ if (png_ptr == NULL)
+ return;
+ png_ptr->mng_features_permitted = (png_byte)
+ ((png_ptr->mng_features_permitted & (~(PNG_FLAG_MNG_EMPTY_PLTE))) |
+ ((empty_plte_permitted & PNG_FLAG_MNG_EMPTY_PLTE)));
+}
+#endif
+
+#if defined(PNG_MNG_FEATURES_SUPPORTED)
+png_uint_32 PNGAPI
+png_permit_mng_features (png_structp png_ptr, png_uint_32 mng_features)
+{
+ png_debug(1, "in png_permit_mng_features\n");
+ if (png_ptr == NULL)
+ return (png_uint_32)0;
+ png_ptr->mng_features_permitted =
+ (png_byte)(mng_features & PNG_ALL_MNG_FEATURES);
+ return (png_uint_32)png_ptr->mng_features_permitted;
+}
+#endif
+
+#if defined(PNG_UNKNOWN_CHUNKS_SUPPORTED)
+void PNGAPI
+png_set_keep_unknown_chunks(png_structp png_ptr, int keep, png_bytep
+ chunk_list, int num_chunks)
+{
+ png_bytep new_list, p;
+ int i, old_num_chunks;
+ if (num_chunks == 0)
+ {
+ if(keep == HANDLE_CHUNK_ALWAYS || keep == HANDLE_CHUNK_IF_SAFE)
+ png_ptr->flags |= PNG_FLAG_KEEP_UNKNOWN_CHUNKS;
+ else
+ png_ptr->flags &= ~PNG_FLAG_KEEP_UNKNOWN_CHUNKS;
+
+ if(keep == HANDLE_CHUNK_ALWAYS)
+ png_ptr->flags |= PNG_FLAG_KEEP_UNSAFE_CHUNKS;
+ else
+ png_ptr->flags &= ~PNG_FLAG_KEEP_UNSAFE_CHUNKS;
+ return;
+ }
+ if (chunk_list == NULL)
+ return;
+ old_num_chunks=png_ptr->num_chunk_list;
+ new_list=(png_bytep)png_malloc(png_ptr,
+ (png_uint_32)(5*(num_chunks+old_num_chunks)));
+ if(png_ptr->chunk_list != NULL)
+ {
+ png_memcpy(new_list, png_ptr->chunk_list,
+ (png_size_t)(5*old_num_chunks));
+ png_free(png_ptr, png_ptr->chunk_list);
+ png_ptr->chunk_list=NULL;
+ }
+ png_memcpy(new_list+5*old_num_chunks, chunk_list,
+ (png_size_t)(5*num_chunks));
+ for (p=new_list+5*old_num_chunks+4, i=0; i<num_chunks; i++, p+=5)
+ *p=(png_byte)keep;
+ png_ptr->num_chunk_list=old_num_chunks+num_chunks;
+ png_ptr->chunk_list=new_list;
+#ifdef PNG_FREE_ME_SUPPORTED
+ png_ptr->free_me |= PNG_FREE_LIST;
+#endif
+}
+#endif
+
+#if defined(PNG_READ_USER_CHUNKS_SUPPORTED)
+void PNGAPI
+png_set_read_user_chunk_fn(png_structp png_ptr, png_voidp user_chunk_ptr,
+ png_user_chunk_ptr read_user_chunk_fn)
+{
+ png_debug(1, "in png_set_read_user_chunk_fn\n");
+ png_ptr->read_user_chunk_fn = read_user_chunk_fn;
+ png_ptr->user_chunk_ptr = user_chunk_ptr;
+}
+#endif
+
+#if defined(PNG_INFO_IMAGE_SUPPORTED)
+void PNGAPI
+png_set_rows(png_structp png_ptr, png_infop info_ptr, png_bytepp row_pointers)
+{
+ png_debug1(1, "in %s storage function\n", "rows");
+
+ if (png_ptr == NULL || info_ptr == NULL)
+ return;
+
+ if(info_ptr->row_pointers && (info_ptr->row_pointers != row_pointers))
+ png_free_data(png_ptr, info_ptr, PNG_FREE_ROWS, 0);
+ info_ptr->row_pointers = row_pointers;
+ if(row_pointers)
+ info_ptr->valid |= PNG_INFO_IDAT;
+}
+#endif
+
+void PNGAPI
+png_set_compression_buffer_size(png_structp png_ptr, png_uint_32 size)
+{
+ if(png_ptr->zbuf)
+ png_free(png_ptr, png_ptr->zbuf);
+ png_ptr->zbuf_size = (png_size_t)size;
+ png_ptr->zbuf = (png_bytep)png_malloc(png_ptr, size);
+ png_ptr->zstream.next_out = png_ptr->zbuf;
+ png_ptr->zstream.avail_out = (uInt)png_ptr->zbuf_size;
+}
+
+void PNGAPI
+png_set_invalid(png_structp png_ptr, png_infop info_ptr, int mask)
+{
+ if (png_ptr && info_ptr)
+ info_ptr->valid &= ~(mask);
+}
+
+
+#ifndef PNG_1_0_X
+#ifdef PNG_ASSEMBLER_CODE_SUPPORTED
+/* this function was added to libpng 1.2.0 and should always exist by default */
+void PNGAPI
+png_set_asm_flags (png_structp png_ptr, png_uint_32 asm_flags)
+{
+ png_uint_32 settable_asm_flags;
+ png_uint_32 settable_mmx_flags;
+
+ settable_mmx_flags =
+#ifdef PNG_HAVE_ASSEMBLER_COMBINE_ROW
+ PNG_ASM_FLAG_MMX_READ_COMBINE_ROW |
+#endif
+#ifdef PNG_HAVE_ASSEMBLER_READ_INTERLACE
+ PNG_ASM_FLAG_MMX_READ_INTERLACE |
+#endif
+#ifdef PNG_HAVE_ASSEMBLER_READ_FILTER_ROW
+ PNG_ASM_FLAG_MMX_READ_FILTER_SUB |
+ PNG_ASM_FLAG_MMX_READ_FILTER_UP |
+ PNG_ASM_FLAG_MMX_READ_FILTER_AVG |
+ PNG_ASM_FLAG_MMX_READ_FILTER_PAETH |
+#endif
+ 0;
+
+ /* could be some non-MMX ones in the future, but not currently: */
+ settable_asm_flags = settable_mmx_flags;
+
+ if (!(png_ptr->asm_flags & PNG_ASM_FLAG_MMX_SUPPORT_COMPILED) ||
+ !(png_ptr->asm_flags & PNG_ASM_FLAG_MMX_SUPPORT_IN_CPU))
+ {
+ /* clear all MMX flags if MMX isn't supported */
+ settable_asm_flags &= ~settable_mmx_flags;
+ png_ptr->asm_flags &= ~settable_mmx_flags;
+ }
+
+ /* we're replacing the settable bits with those passed in by the user,
+ * so first zero them out of the master copy, then logical-OR in the
+ * allowed subset that was requested */
+
+ png_ptr->asm_flags &= ~settable_asm_flags; /* zero them */
+ png_ptr->asm_flags |= (asm_flags & settable_asm_flags); /* set them */
+}
+#endif /* ?PNG_ASSEMBLER_CODE_SUPPORTED */
+
+#ifdef PNG_ASSEMBLER_CODE_SUPPORTED
+/* this function was added to libpng 1.2.0 */
+void PNGAPI
+png_set_mmx_thresholds (png_structp png_ptr,
+ png_byte mmx_bitdepth_threshold,
+ png_uint_32 mmx_rowbytes_threshold)
+{
+ png_ptr->mmx_bitdepth_threshold = mmx_bitdepth_threshold;
+ png_ptr->mmx_rowbytes_threshold = mmx_rowbytes_threshold;
+}
+#endif /* ?PNG_ASSEMBLER_CODE_SUPPORTED */
+#endif /* ?PNG_1_0_X */
/* pngtest.c - a simple test program to test libpng
*
- * libpng 1.0.3 -January 14, 1999
+ * libpng 1.2.4 - July 8, 2002
* For conditions of distribution and use, see copyright notice in png.h
- * Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.
- * Copyright (c) 1996, 1997 Andreas Dilger
- * Copyright (c) 1998, 1999 Glenn Randers-Pehrson
+ * Copyright (c) 1998-2002 Glenn Randers-Pehrson
+ * (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger)
+ * (Version 0.88 Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.)
*
* This program reads in a PNG image, writes it out again, and then
* compares the two files. If the files are identical, this shows that
*
* The program will report "FAIL" in certain legitimate cases:
* 1) when the compression level or filter selection method is changed.
- * 2) when the chunk size is not 8K.
- * 3) unknown ancillary chunks exist in the input file.
+ * 2) when the maximum IDAT size (PNG_ZBUF_SIZE in pngconf.h) is not 8192.
+ * 3) unknown unsafe-to-copy ancillary chunks or unknown critical chunks
+ * exist in the input file.
* 4) others not listed here...
* In these cases, it is best to check with another tool such as "pngcheck"
- * to see what the differences between the two images are.
+ * to see what the differences between the two files are.
*
* If a filename is given on the command-line, then this file is used
* for the input, rather than the default "pngtest.png". This allows
* of files at once by typing "pngtest -m file1.png file2.png ..."
*/
-#include <stdio.h>
-#include <stdlib.h>
+#if defined(_WIN32_WCE)
+# if _WIN32_WCE < 211
+ __error__ (f|w)printf functions are not supported on old WindowsCE.;
+# endif
+# include <windows.h>
+# include <stdlib.h>
+# define READFILE(file, data, length, check) \
+ if (ReadFile(file, data, length, &check,NULL)) check = 0
+# define WRITEFILE(file, data, length, check)) \
+ if (WriteFile(file, data, length, &check, NULL)) check = 0
+# define FCLOSE(file) CloseHandle(file)
+#else
+# include <stdio.h>
+# include <stdlib.h>
+# include <assert.h>
+# define READFILE(file, data, length, check) \
+ check=(png_size_t)fread(data,(png_size_t)1,length,file)
+# define WRITEFILE(file, data, length, check) \
+ check=(png_size_t)fwrite(data,(png_size_t)1, length, file)
+# define FCLOSE(file) fclose(file)
+#endif
+
+#if defined(PNG_NO_STDIO)
+# if defined(_WIN32_WCE)
+ typedef HANDLE png_FILE_p;
+# else
+ typedef FILE * png_FILE_p;
+# endif
+#endif
/* Makes pngtest verbose so we can find problems (needs to be before png.h) */
#ifndef PNG_DEBUG
-#define PNG_DEBUG 0
+# define PNG_DEBUG 0
+#endif
+
+#if !PNG_DEBUG
+# define SINGLE_ROWBUF_ALLOC /* makes buffer overruns easier to nail */
+#endif
+
+/* Turn on CPU timing
+#define PNGTEST_TIMING
+*/
+
+#ifdef PNG_NO_FLOATING_POINT_SUPPORTED
+#undef PNGTEST_TIMING
+#endif
+
+#ifdef PNGTEST_TIMING
+static float t_start, t_stop, t_decode, t_encode, t_misc;
+#include <time.h>
#endif
#include "png.h"
+/* Define png_jmpbuf() in case we are using a pre-1.0.6 version of libpng */
+#ifndef png_jmpbuf
+# define png_jmpbuf(png_ptr) png_ptr->jmpbuf
+#endif
+
+#ifdef PNGTEST_TIMING
+static float t_start, t_stop, t_decode, t_encode, t_misc;
+#if !defined(PNG_tIME_SUPPORTED)
+#include <time.h>
+#endif
+#endif
+
#if defined(PNG_TIME_RFC1123_SUPPORTED)
static int tIME_chunk_present=0;
static char tIME_string[30] = "no tIME chunk present in file";
-#endif /* PNG_TIME_RFC1123_SUPPORTED */
+#endif
+
+static int verbose = 0;
int test_one_file PNGARG((PNG_CONST char *inname, PNG_CONST char *outname));
static int status_dots_requested=0;
static int status_dots=1;
+void
+#ifdef PNG_1_0_X
+PNGAPI
+#endif
+read_row_callback(png_structp png_ptr, png_uint_32 row_number, int pass);
+#ifdef PNG_1_0_X
+PNGAPI
+#endif
void
read_row_callback(png_structp png_ptr, png_uint_32 row_number, int pass)
{
- if(png_ptr == NULL || row_number > 0x3fffffffL) return;
+ if(png_ptr == NULL || row_number > PNG_MAX_UINT) return;
if(status_pass != pass)
{
fprintf(stdout,"\n Pass %d: ",pass);
status_pass = pass;
- status_dots = 30;
+ status_dots = 31;
}
status_dots--;
if(status_dots == 0)
fprintf(stdout, "r");
}
+#ifdef PNG_1_0_X
+PNGAPI
+#endif
+void
+write_row_callback(png_structp png_ptr, png_uint_32 row_number, int pass);
+#ifdef PNG_1_0_X
+PNGAPI
+#endif
void
write_row_callback(png_structp png_ptr, png_uint_32 row_number, int pass)
{
- if(png_ptr == NULL || row_number > 0x3fffffffL || pass > 7) return;
+ if(png_ptr == NULL || row_number > PNG_MAX_UINT || pass > 7) return;
fprintf(stdout, "w");
}
+#if defined(PNG_READ_USER_TRANSFORM_SUPPORTED)
+/* Example of using user transform callback (we don't transform anything,
+ but merely examine the row filters. We set this to 256 rather than
+ 5 in case illegal filter values are present.) */
+static png_uint_32 filters_used[256];
+void
+#ifdef PNG_1_0_X
+PNGAPI
+#endif
+count_filters(png_structp png_ptr, png_row_infop row_info, png_bytep data);
+void
+#ifdef PNG_1_0_X
+PNGAPI
+#endif
+count_filters(png_structp png_ptr, png_row_infop row_info, png_bytep data)
+{
+ if(png_ptr != NULL && row_info != NULL)
+ ++filters_used[*(data-1)];
+}
+#endif
+
#if defined(PNG_WRITE_USER_TRANSFORM_SUPPORTED)
/* example of using user transform callback (we don't transform anything,
but merely count the zero samples) */
static png_uint_32 zero_samples;
void
+#ifdef PNG_1_0_X
+PNGAPI
+#endif
+count_zero_samples(png_structp png_ptr, png_row_infop row_info, png_bytep data);
+void
+#ifdef PNG_1_0_X
+PNGAPI
+#endif
count_zero_samples(png_structp png_ptr, png_row_infop row_info, png_bytep data)
{
png_bytep dp = data;
* png_byte pixel_depth bits per pixel (depth*channels)
*/
+
/* counts the number of zero samples (or zero pixels if color_type is 3 */
if(row_info->color_type == 0 || row_info->color_type == 3)
{
if(row_info->bit_depth == 1)
{
- if(((*dp << pos++ )& 0x80) == 0) zero_samples++;
+ if(((*dp << pos++ ) & 0x80) == 0) zero_samples++;
if(pos == 8)
{
pos = 0;
}
if(row_info->bit_depth == 2)
{
- if(((*dp << (pos+=2))& 0xc0) == 0) zero_samples++;
+ if(((*dp << (pos+=2)) & 0xc0) == 0) zero_samples++;
if(pos == 8)
{
pos = 0;
}
if(row_info->bit_depth == 4)
{
- if(((*dp << (pos+=4))& 0xf0) == 0) zero_samples++;
+ if(((*dp << (pos+=4)) & 0xf0) == 0) zero_samples++;
if(pos == 8)
{
pos = 0;
}
#endif /* PNG_WRITE_USER_TRANSFORM_SUPPORTED */
-static int verbose = 0;
static int wrote_question = 0;
#if defined(PNG_NO_STDIO)
not reading from a standard C stream, you should create a replacement
read_data function and use it at run time with png_set_read_fn(), rather
than changing the library. */
+
#ifndef USE_FAR_KEYWORD
static void
-png_default_read_data(png_structp png_ptr, png_bytep data, png_size_t length)
+pngtest_read_data(png_structp png_ptr, png_bytep data, png_size_t length)
{
png_size_t check;
/* fread() returns 0 on error, so it is OK to store this in a png_size_t
* instead of an int, which is what fread() actually returns.
*/
- check = (png_size_t)fread(data, (png_size_t)1, length,
- (FILE *)png_ptr->io_ptr);
+ READFILE((png_FILE_p)png_ptr->io_ptr, data, length, check);
if (check != length)
{
- png_error(png_ptr, "Read Error");
+ png_error(png_ptr, "Read Error!");
}
}
#else
#define MIN(a,b) (a <= b ? a : b)
static void
-png_default_read_data(png_structp png_ptr, png_bytep data, png_size_t length)
+pngtest_read_data(png_structp png_ptr, png_bytep data, png_size_t length)
{
int check;
png_byte *n_data;
- FILE *io_ptr;
+ png_FILE_p io_ptr;
/* Check if data really is near. If so, use usual code. */
n_data = (png_byte *)CVT_PTR_NOCHECK(data);
- io_ptr = (FILE *)CVT_PTR(png_ptr->io_ptr);
+ io_ptr = (png_FILE_p)CVT_PTR(png_ptr->io_ptr);
if ((png_bytep)n_data == data)
{
- check = fread(n_data, 1, length, io_ptr);
+ READFILE(io_ptr, n_data, length, check);
}
else
{
do
{
read = MIN(NEAR_BUF_SIZE, remaining);
- err = fread(buf, (png_size_t)1, read, io_ptr);
+ READFILE(io_ptr, buf, 1, err);
png_memcpy(data, buf, read); /* copy far buffer to near buffer */
if(err != read)
break;
#if defined(PNG_WRITE_FLUSH_SUPPORTED)
static void
-png_default_flush(png_structp png_ptr)
+pngtest_flush(png_structp png_ptr)
{
- FILE *io_ptr;
- io_ptr = (FILE *)CVT_PTR((png_ptr->io_ptr));
+#if !defined(_WIN32_WCE)
+ png_FILE_p io_ptr;
+ io_ptr = (png_FILE_p)CVT_PTR((png_ptr->io_ptr));
if (io_ptr != NULL)
fflush(io_ptr);
+#endif
}
#endif
than changing the library. */
#ifndef USE_FAR_KEYWORD
static void
-png_default_write_data(png_structp png_ptr, png_bytep data, png_size_t length)
+pngtest_write_data(png_structp png_ptr, png_bytep data, png_size_t length)
{
png_uint_32 check;
- check = fwrite(data, 1, length, (FILE *)(png_ptr->io_ptr));
+ WRITEFILE((png_FILE_p)png_ptr->io_ptr, data, length, check);
if (check != length)
{
png_error(png_ptr, "Write Error");
#define MIN(a,b) (a <= b ? a : b)
static void
-png_default_write_data(png_structp png_ptr, png_bytep data, png_size_t length)
+pngtest_write_data(png_structp png_ptr, png_bytep data, png_size_t length)
{
png_uint_32 check;
png_byte *near_data; /* Needs to be "png_byte *" instead of "png_bytep" */
- FILE *io_ptr;
+ png_FILE_p io_ptr;
/* Check if data really is near. If so, use usual code. */
near_data = (png_byte *)CVT_PTR_NOCHECK(data);
- io_ptr = (FILE *)CVT_PTR(png_ptr->io_ptr);
+ io_ptr = (png_FILE_p)CVT_PTR(png_ptr->io_ptr);
if ((png_bytep)near_data == data)
{
- check = fwrite(near_data, 1, length, io_ptr);
+ WRITEFILE(io_ptr, near_data, length, check);
}
else
{
{
written = MIN(NEAR_BUF_SIZE, remaining);
png_memcpy(buf, data, written); /* copy far buffer to near buffer */
- err = fwrite(buf, 1, written, io_ptr);
+ WRITEFILE(io_ptr, buf, written, err);
if (err != written)
break;
else
* not used, but it is passed in case it may be useful.
*/
static void
-png_default_warning(png_structp png_ptr, png_const_charp message)
+pngtest_warning(png_structp png_ptr, png_const_charp message)
{
PNG_CONST char *name = "UNKNOWN (ERROR!)";
if (png_ptr != NULL && png_ptr->error_ptr != NULL)
* error function pointer in png_set_error_fn().
*/
static void
-png_default_error(png_structp png_ptr, png_const_charp message)
+pngtest_error(png_structp png_ptr, png_const_charp message)
{
- png_default_warning(png_ptr, message);
+ pngtest_warning(png_ptr, message);
/* We can return because png_error calls the default handler, which is
* actually OK in this case. */
}
This piece of code can be compiled to validate max 64K allocations
by setting MAXSEG_64K in zlib zconf.h *or* PNG_MAX_MALLOC_64K. */
-typedef struct memory_information {
- png_uint_32 size;
+typedef struct memory_information
+{
+ png_uint_32 size;
png_voidp pointer;
struct memory_information FAR *next;
} memory_information;
static memory_infop pinformation = NULL;
static int current_allocation = 0;
static int maximum_allocation = 0;
+static int total_allocation = 0;
+static int num_allocations = 0;
-extern PNG_EXPORT(png_voidp,png_debug_malloc) PNGARG((png_structp png_ptr,
- png_uint_32 size));
-extern PNG_EXPORT(void,png_debug_free) PNGARG((png_structp png_ptr,
- png_voidp ptr));
+png_voidp png_debug_malloc PNGARG((png_structp png_ptr, png_uint_32 size));
+void png_debug_free PNGARG((png_structp png_ptr, png_voidp ptr));
png_voidp
-png_debug_malloc(png_structp png_ptr, png_uint_32 size) {
+png_debug_malloc(png_structp png_ptr, png_uint_32 size)
+{
/* png_malloc has already tested for NULL; png_create_struct calls
png_debug_malloc directly, with png_ptr == NULL which is OK */
if (size == 0)
- return (png_voidp)(NULL);
+ return (NULL);
/* This calls the library allocator twice, once to get the requested
buffer and once to get a new free list entry. */
{
- memory_infop pinfo = png_malloc_default(png_ptr, sizeof *pinfo);
+ memory_infop pinfo = (memory_infop)png_malloc_default(png_ptr,
+ (png_uint_32)sizeof *pinfo);
pinfo->size = size;
current_allocation += size;
+ total_allocation += size;
+ num_allocations ++;
if (current_allocation > maximum_allocation)
maximum_allocation = current_allocation;
- pinfo->pointer = png_malloc_default(png_ptr, size);
+ pinfo->pointer = (png_voidp)png_malloc_default(png_ptr, size);
pinfo->next = pinformation;
pinformation = pinfo;
/* Make sure the caller isn't assuming zeroed memory. */
png_memset(pinfo->pointer, 0xdd, pinfo->size);
+#if PNG_DEBUG
+ if(verbose)
+ printf("png_malloc %lu bytes at %x\n",size,pinfo->pointer);
+#endif
+ assert(pinfo->size != 12345678);
return (png_voidp)(pinfo->pointer);
}
}
{
if (png_ptr == NULL)
fprintf(STDERR, "NULL pointer to png_debug_free.\n");
- if (ptr == 0) {
+ if (ptr == 0)
+ {
#if 0 /* This happens all the time. */
fprintf(STDERR, "WARNING: freeing NULL pointer\n");
#endif
/* Unlink the element from the list. */
{
memory_infop FAR *ppinfo = &pinformation;
- for (;;) {
+ for (;;)
+ {
memory_infop pinfo = *ppinfo;
- if (pinfo->pointer == ptr) {
+ if (pinfo->pointer == ptr)
+ {
*ppinfo = pinfo->next;
current_allocation -= pinfo->size;
if (current_allocation < 0)
fprintf(STDERR, "Duplicate free of memory\n");
/* We must free the list element too, but first kill
the memory that is to be freed. */
- memset(ptr, 0x55, pinfo->size);
+ png_memset(ptr, 0x55, pinfo->size);
png_free_default(png_ptr, pinfo);
+ pinfo=NULL;
break;
}
- if (pinfo->next == NULL) {
- fprintf(STDERR, "Pointer %x not found\n", ptr);
+ if (pinfo->next == NULL)
+ {
+ fprintf(STDERR, "Pointer %x not found\n", (unsigned int)ptr);
break;
}
ppinfo = &pinfo->next;
}
/* Finally free the data. */
+#if PNG_DEBUG
+ if(verbose)
+ printf("Freeing %x\n",ptr);
+#endif
png_free_default(png_ptr, ptr);
+ ptr=NULL;
}
#endif /* PNG_USER_MEM_SUPPORTED */
/* END of code to test memory allocation/deallocation */
int
test_one_file(PNG_CONST char *inname, PNG_CONST char *outname)
{
- static FILE *fpin, *fpout; /* "static" prevents setjmp corruption */
- png_structp read_ptr, write_ptr;
- png_infop read_info_ptr, write_info_ptr, end_info_ptr;
+ static png_FILE_p fpin;
+ static png_FILE_p fpout; /* "static" prevents setjmp corruption */
+ png_structp read_ptr;
+ png_infop read_info_ptr, end_info_ptr;
+#ifdef PNG_WRITE_SUPPORTED
+ png_structp write_ptr;
+ png_infop write_info_ptr;
+ png_infop write_end_info_ptr;
+#else
+ png_structp write_ptr = NULL;
+ png_infop write_info_ptr = NULL;
+ png_infop write_end_info_ptr = NULL;
+#endif
png_bytep row_buf;
png_uint_32 y;
png_uint_32 width, height;
int num_pass, pass;
int bit_depth, color_type;
+#ifdef PNG_SETJMP_SUPPORTED
#ifdef USE_FAR_KEYWORD
jmp_buf jmpbuf;
-#endif
+#endif
+#endif
+#if defined(_WIN32_WCE)
+ TCHAR path[MAX_PATH];
+#endif
char inbuf[256], outbuf[256];
- row_buf = (png_bytep)NULL;
+ row_buf = NULL;
+#if defined(_WIN32_WCE)
+ MultiByteToWideChar(CP_ACP, 0, inname, -1, path, MAX_PATH);
+ if ((fpin = CreateFile(path, GENERIC_READ, 0, NULL, OPEN_EXISTING, 0, NULL)) == INVALID_HANDLE_VALUE)
+#else
if ((fpin = fopen(inname, "rb")) == NULL)
+#endif
{
fprintf(STDERR, "Could not find input file %s\n", inname);
return (1);
}
+#if defined(_WIN32_WCE)
+ MultiByteToWideChar(CP_ACP, 0, outname, -1, path, MAX_PATH);
+ if ((fpout = CreateFile(path, GENERIC_WRITE, 0, NULL, CREATE_ALWAYS, 0, NULL)) == INVALID_HANDLE_VALUE)
+#else
if ((fpout = fopen(outname, "wb")) == NULL)
+#endif
{
fprintf(STDERR, "Could not open output file %s\n", outname);
- fclose(fpin);
+ FCLOSE(fpin);
return (1);
}
png_debug(0, "Allocating read and write structures\n");
#ifdef PNG_USER_MEM_SUPPORTED
- read_ptr = png_create_read_struct_2(PNG_LIBPNG_VER_STRING, (png_voidp)NULL,
- (png_error_ptr)NULL, (png_error_ptr)NULL, (png_voidp)NULL,
+ read_ptr = png_create_read_struct_2(PNG_LIBPNG_VER_STRING, png_voidp_NULL,
+ png_error_ptr_NULL, png_error_ptr_NULL, png_voidp_NULL,
(png_malloc_ptr)png_debug_malloc, (png_free_ptr)png_debug_free);
#else
- read_ptr = png_create_read_struct(PNG_LIBPNG_VER_STRING, (png_voidp)NULL,
- (png_error_ptr)NULL, (png_error_ptr)NULL);
+ read_ptr = png_create_read_struct(PNG_LIBPNG_VER_STRING, png_voidp_NULL,
+ png_error_ptr_NULL, png_error_ptr_NULL);
#endif
#if defined(PNG_NO_STDIO)
- png_set_error_fn(read_ptr, (png_voidp)inname, png_default_error,
- png_default_warning);
+ png_set_error_fn(read_ptr, (png_voidp)inname, pngtest_error,
+ pngtest_warning);
#endif
+#ifdef PNG_WRITE_SUPPORTED
#ifdef PNG_USER_MEM_SUPPORTED
- write_ptr = png_create_write_struct_2(PNG_LIBPNG_VER_STRING, (png_voidp)NULL,
- (png_error_ptr)NULL, (png_error_ptr)NULL, (png_voidp)NULL,
+ write_ptr = png_create_write_struct_2(PNG_LIBPNG_VER_STRING, png_voidp_NULL,
+ png_error_ptr_NULL, png_error_ptr_NULL, png_voidp_NULL,
(png_malloc_ptr)png_debug_malloc, (png_free_ptr)png_debug_free);
#else
- write_ptr = png_create_write_struct(PNG_LIBPNG_VER_STRING, (png_voidp)NULL,
- (png_error_ptr)NULL, (png_error_ptr)NULL);
+ write_ptr = png_create_write_struct(PNG_LIBPNG_VER_STRING, png_voidp_NULL,
+ png_error_ptr_NULL, png_error_ptr_NULL);
#endif
#if defined(PNG_NO_STDIO)
- png_set_error_fn(write_ptr, (png_voidp)inname, png_default_error,
- png_default_warning);
+ png_set_error_fn(write_ptr, (png_voidp)inname, pngtest_error,
+ pngtest_warning);
+#endif
#endif
png_debug(0, "Allocating read_info, write_info and end_info structures\n");
read_info_ptr = png_create_info_struct(read_ptr);
- write_info_ptr = png_create_info_struct(write_ptr);
end_info_ptr = png_create_info_struct(read_ptr);
-#ifdef PNG_USER_MEM_SUPPORTED
+#ifdef PNG_WRITE_SUPPORTED
+ write_info_ptr = png_create_info_struct(write_ptr);
+ write_end_info_ptr = png_create_info_struct(write_ptr);
#endif
+#ifdef PNG_SETJMP_SUPPORTED
png_debug(0, "Setting jmpbuf for read struct\n");
#ifdef USE_FAR_KEYWORD
if (setjmp(jmpbuf))
#else
- if (setjmp(read_ptr->jmpbuf))
+ if (setjmp(png_jmpbuf(read_ptr)))
#endif
{
fprintf(STDERR, "%s -> %s: libpng read error\n", inname, outname);
+ if (row_buf)
+ png_free(read_ptr, row_buf);
png_destroy_read_struct(&read_ptr, &read_info_ptr, &end_info_ptr);
+#ifdef PNG_WRITE_SUPPORTED
+ png_destroy_info_struct(write_ptr, &write_end_info_ptr);
png_destroy_write_struct(&write_ptr, &write_info_ptr);
- fclose(fpin);
- fclose(fpout);
+#endif
+ FCLOSE(fpin);
+ FCLOSE(fpout);
return (1);
}
#ifdef USE_FAR_KEYWORD
- png_memcpy(read_ptr->jmpbuf,jmpbuf,sizeof(jmp_buf));
+ png_memcpy(png_jmpbuf(read_ptr),jmpbuf,sizeof(jmp_buf));
#endif
+#ifdef PNG_WRITE_SUPPORTED
png_debug(0, "Setting jmpbuf for write struct\n");
#ifdef USE_FAR_KEYWORD
if (setjmp(jmpbuf))
#else
- if (setjmp(write_ptr->jmpbuf))
+ if (setjmp(png_jmpbuf(write_ptr)))
#endif
{
fprintf(STDERR, "%s -> %s: libpng write error\n", inname, outname);
png_destroy_read_struct(&read_ptr, &read_info_ptr, &end_info_ptr);
+ png_destroy_info_struct(write_ptr, &write_end_info_ptr);
+#ifdef PNG_WRITE_SUPPORTED
png_destroy_write_struct(&write_ptr, &write_info_ptr);
- fclose(fpin);
- fclose(fpout);
+#endif
+ FCLOSE(fpin);
+ FCLOSE(fpout);
return (1);
}
#ifdef USE_FAR_KEYWORD
- png_memcpy(write_ptr->jmpbuf,jmpbuf,sizeof(jmp_buf));
+ png_memcpy(png_jmpbuf(write_ptr),jmpbuf,sizeof(jmp_buf));
+#endif
+#endif
#endif
png_debug(0, "Initializing input and output streams\n");
#if !defined(PNG_NO_STDIO)
png_init_io(read_ptr, fpin);
+# ifdef PNG_WRITE_SUPPORTED
png_init_io(write_ptr, fpout);
+# endif
#else
- png_set_read_fn(read_ptr, (png_voidp)fpin, png_default_read_data);
- png_set_write_fn(write_ptr, (png_voidp)fpout, png_default_write_data,
-#if defined(PNG_WRITE_FLUSH_SUPPORTED)
- png_default_flush);
-#else
+ png_set_read_fn(read_ptr, (png_voidp)fpin, pngtest_read_data);
+# ifdef PNG_WRITE_SUPPORTED
+ png_set_write_fn(write_ptr, (png_voidp)fpout, pngtest_write_data,
+# if defined(PNG_WRITE_FLUSH_SUPPORTED)
+ pngtest_flush);
+# else
NULL);
-#endif
+# endif
+# endif
#endif
if(status_dots_requested == 1)
{
+#ifdef PNG_WRITE_SUPPORTED
png_set_write_status_fn(write_ptr, write_row_callback);
+#endif
png_set_read_status_fn(read_ptr, read_row_callback);
}
else
{
- png_set_write_status_fn(write_ptr, NULL);
- png_set_read_status_fn(read_ptr, NULL);
+#ifdef PNG_WRITE_SUPPORTED
+ png_set_write_status_fn(write_ptr, png_write_status_ptr_NULL);
+#endif
+ png_set_read_status_fn(read_ptr, png_read_status_ptr_NULL);
}
-# if defined(PNG_WRITE_USER_TRANSFORM_SUPPORTED)
- zero_samples=0;
- png_set_write_user_transform_fn(write_ptr, count_zero_samples);
-# endif
+#if defined(PNG_READ_USER_TRANSFORM_SUPPORTED)
+ {
+ int i;
+ for(i=0; i<256; i++)
+ filters_used[i]=0;
+ png_set_read_user_transform_fn(read_ptr, count_filters);
+ }
+#endif
+#if defined(PNG_WRITE_USER_TRANSFORM_SUPPORTED)
+ zero_samples=0;
+ png_set_write_user_transform_fn(write_ptr, count_zero_samples);
+#endif
+
+#define HANDLE_CHUNK_IF_SAFE 2
+#define HANDLE_CHUNK_ALWAYS 3
+#if defined(PNG_READ_UNKNOWN_CHUNKS_SUPPORTED)
+ png_set_keep_unknown_chunks(read_ptr, HANDLE_CHUNK_ALWAYS,
+ png_bytep_NULL, 0);
+#endif
+#if defined(PNG_WRITE_UNKNOWN_CHUNKS_SUPPORTED)
+ png_set_keep_unknown_chunks(write_ptr, HANDLE_CHUNK_IF_SAFE,
+ png_bytep_NULL, 0);
+#endif
png_debug(0, "Reading info struct\n");
png_read_info(read_ptr, read_info_ptr);
#endif
}
}
-#if defined(PNG_READ_bKGD_SUPPORTED) && defined(PNG_WRITE_bKGD_SUPPORTED)
+#if defined(PNG_FIXED_POINT_SUPPORTED)
+#if defined(PNG_cHRM_SUPPORTED)
{
- png_color_16p background;
-
- if (png_get_bKGD(read_ptr, read_info_ptr, &background))
+ png_fixed_point white_x, white_y, red_x, red_y, green_x, green_y, blue_x,
+ blue_y;
+ if (png_get_cHRM_fixed(read_ptr, read_info_ptr, &white_x, &white_y, &red_x,
+ &red_y, &green_x, &green_y, &blue_x, &blue_y))
{
- png_set_bKGD(write_ptr, write_info_ptr, background);
+ png_set_cHRM_fixed(write_ptr, write_info_ptr, white_x, white_y, red_x,
+ red_y, green_x, green_y, blue_x, blue_y);
}
}
#endif
-#if defined(PNG_READ_cHRM_SUPPORTED) && defined(PNG_WRITE_cHRM_SUPPORTED)
+#if defined(PNG_gAMA_SUPPORTED)
{
- double white_x, white_y, red_x, red_y, green_x, green_y, blue_x, blue_y;
+ png_fixed_point gamma;
+ if (png_get_gAMA_fixed(read_ptr, read_info_ptr, &gamma))
+ {
+ png_set_gAMA_fixed(write_ptr, write_info_ptr, gamma);
+ }
+ }
+#endif
+#else /* Use floating point versions */
+#if defined(PNG_FLOATING_POINT_SUPPORTED)
+#if defined(PNG_cHRM_SUPPORTED)
+ {
+ double white_x, white_y, red_x, red_y, green_x, green_y, blue_x,
+ blue_y;
if (png_get_cHRM(read_ptr, read_info_ptr, &white_x, &white_y, &red_x,
&red_y, &green_x, &green_y, &blue_x, &blue_y))
{
}
}
#endif
-#if defined(PNG_READ_gAMA_SUPPORTED) && defined(PNG_WRITE_gAMA_SUPPORTED)
+#if defined(PNG_gAMA_SUPPORTED)
{
double gamma;
}
}
#endif
-#if defined(PNG_READ_sRGB_SUPPORTED) && defined(PNG_WRITE_sRGB_SUPPORTED)
+#endif /* floating point */
+#endif /* fixed point */
+#if defined(PNG_iCCP_SUPPORTED)
+ {
+ png_charp name;
+ png_charp profile;
+ png_uint_32 proflen;
+ int compression_type;
+
+ if (png_get_iCCP(read_ptr, read_info_ptr, &name, &compression_type,
+ &profile, &proflen))
+ {
+ png_set_iCCP(write_ptr, write_info_ptr, name, compression_type,
+ profile, proflen);
+ }
+ }
+#endif
+#if defined(PNG_sRGB_SUPPORTED)
{
int intent;
}
}
#endif
-#if defined(PNG_READ_hIST_SUPPORTED) && defined(PNG_WRITE_hIST_SUPPORTED)
+ {
+ png_colorp palette;
+ int num_palette;
+
+ if (png_get_PLTE(read_ptr, read_info_ptr, &palette, &num_palette))
+ {
+ png_set_PLTE(write_ptr, write_info_ptr, palette, num_palette);
+ }
+ }
+#if defined(PNG_bKGD_SUPPORTED)
+ {
+ png_color_16p background;
+
+ if (png_get_bKGD(read_ptr, read_info_ptr, &background))
+ {
+ png_set_bKGD(write_ptr, write_info_ptr, background);
+ }
+ }
+#endif
+#if defined(PNG_hIST_SUPPORTED)
{
png_uint_16p hist;
}
}
#endif
-#if defined(PNG_READ_oFFs_SUPPORTED) && defined(PNG_WRITE_oFFs_SUPPORTED)
+#if defined(PNG_oFFs_SUPPORTED)
{
- png_uint_32 offset_x, offset_y;
+ png_int_32 offset_x, offset_y;
int unit_type;
if (png_get_oFFs(read_ptr, read_info_ptr,&offset_x,&offset_y,&unit_type))
}
}
#endif
-#if defined(PNG_READ_pCAL_SUPPORTED) && defined(PNG_WRITE_pCAL_SUPPORTED)
+#if defined(PNG_pCAL_SUPPORTED)
{
png_charp purpose, units;
png_charpp params;
}
}
#endif
-#if defined(PNG_READ_pHYs_SUPPORTED) && defined(PNG_WRITE_pHYs_SUPPORTED)
+#if defined(PNG_pHYs_SUPPORTED)
{
png_uint_32 res_x, res_y;
int unit_type;
}
}
#endif
+#if defined(PNG_sBIT_SUPPORTED)
{
- png_colorp palette;
- int num_palette;
+ png_color_8p sig_bit;
- if (png_get_PLTE(read_ptr, read_info_ptr, &palette, &num_palette))
+ if (png_get_sBIT(read_ptr, read_info_ptr, &sig_bit))
{
- png_set_PLTE(write_ptr, write_info_ptr, palette, num_palette);
+ png_set_sBIT(write_ptr, write_info_ptr, sig_bit);
}
}
-#if defined(PNG_READ_sBIT_SUPPORTED) && defined(PNG_WRITE_sBIT_SUPPORTED)
+#endif
+#if defined(PNG_sCAL_SUPPORTED)
+#ifdef PNG_FLOATING_POINT_SUPPORTED
{
- png_color_8p sig_bit;
+ int unit;
+ double scal_width, scal_height;
- if (png_get_sBIT(read_ptr, read_info_ptr, &sig_bit))
+ if (png_get_sCAL(read_ptr, read_info_ptr, &unit, &scal_width,
+ &scal_height))
{
- png_set_sBIT(write_ptr, write_info_ptr, sig_bit);
+ png_set_sCAL(write_ptr, write_info_ptr, unit, scal_width, scal_height);
}
}
+#else
+#ifdef PNG_FIXED_POINT_SUPPORTED
+ {
+ int unit;
+ png_charp scal_width, scal_height;
+
+ if (png_get_sCAL_s(read_ptr, read_info_ptr, &unit, &scal_width,
+ &scal_height))
+ {
+ png_set_sCAL_s(write_ptr, write_info_ptr, unit, scal_width, scal_height);
+ }
+ }
+#endif
#endif
-#if (defined(PNG_READ_tEXt_SUPPORTED) && defined(PNG_WRITE_tEXt_SUPPORTED)) || \
- (defined(PNG_READ_zTXt_SUPPORTED) && defined(PNG_WRITE_zTXt_SUPPORTED))
+#endif
+#if defined(PNG_TEXT_SUPPORTED)
{
png_textp text_ptr;
int num_text;
if (png_get_text(read_ptr, read_info_ptr, &text_ptr, &num_text) > 0)
{
- png_debug1(0, "Handling %d tEXt/zTXt chunks\n", num_text);
+ png_debug1(0, "Handling %d iTXt/tEXt/zTXt chunks\n", num_text);
png_set_text(write_ptr, write_info_ptr, text_ptr, num_text);
}
}
#endif
-#if defined(PNG_READ_tIME_SUPPORTED) && defined(PNG_WRITE_tIME_SUPPORTED)
+#if defined(PNG_tIME_SUPPORTED)
{
png_timep mod_time;
}
}
#endif
-#if defined(PNG_READ_tRNS_SUPPORTED) && defined(PNG_WRITE_tRNS_SUPPORTED)
+#if defined(PNG_tRNS_SUPPORTED)
{
png_bytep trans;
int num_trans;
}
}
#endif
+#if defined(PNG_WRITE_UNKNOWN_CHUNKS_SUPPORTED)
+ {
+ png_unknown_chunkp unknowns;
+ int num_unknowns = (int)png_get_unknown_chunks(read_ptr, read_info_ptr,
+ &unknowns);
+ if (num_unknowns)
+ {
+ png_size_t i;
+ png_set_unknown_chunks(write_ptr, write_info_ptr, unknowns,
+ num_unknowns);
+ /* copy the locations from the read_info_ptr. The automatically
+ generated locations in write_info_ptr are wrong because we
+ haven't written anything yet */
+ for (i = 0; i < (png_size_t)num_unknowns; i++)
+ png_set_unknown_chunk_location(write_ptr, write_info_ptr, i,
+ unknowns[i].location);
+ }
+ }
+#endif
+#ifdef PNG_WRITE_SUPPORTED
png_debug(0, "\nWriting info struct\n");
+
+/* If we wanted, we could write info in two steps:
+ png_write_info_before_PLTE(write_ptr, write_info_ptr);
+ */
png_write_info(write_ptr, write_info_ptr);
+#endif
- png_debug(0, "\nAllocating row buffer \n");
+#ifdef SINGLE_ROWBUF_ALLOC
+ png_debug(0, "\nAllocating row buffer...");
row_buf = (png_bytep)png_malloc(read_ptr,
png_get_rowbytes(read_ptr, read_info_ptr));
- if (row_buf == NULL)
- {
- fprintf(STDERR, "No memory to allocate row buffer\n");
- png_destroy_read_struct(&read_ptr, &read_info_ptr, (png_infopp)NULL);
- png_destroy_write_struct(&write_ptr, &write_info_ptr);
- fclose(fpin);
- fclose(fpout);
- return (1);
- }
+ png_debug1(0, "0x%08lx\n\n", (unsigned long)row_buf);
+#endif /* SINGLE_ROWBUF_ALLOC */
png_debug(0, "Writing row data\n");
+#if defined(PNG_READ_INTERLACING_SUPPORTED) || \
+ defined(PNG_WRITE_INTERLACING_SUPPORTED)
num_pass = png_set_interlace_handling(read_ptr);
+# ifdef PNG_WRITE_SUPPORTED
png_set_interlace_handling(write_ptr);
+# endif
+#else
+ num_pass=1;
+#endif
+#ifdef PNGTEST_TIMING
+ t_stop = (float)clock();
+ t_misc += (t_stop - t_start);
+ t_start = t_stop;
+#endif
for (pass = 0; pass < num_pass; pass++)
{
png_debug1(0, "Writing row data for pass %d\n",pass);
for (y = 0; y < height; y++)
{
- png_read_rows(read_ptr, (png_bytepp)&row_buf, (png_bytepp)NULL, 1);
+#ifndef SINGLE_ROWBUF_ALLOC
+ png_debug2(0, "\nAllocating row buffer (pass %d, y = %ld)...", pass,y);
+ row_buf = (png_bytep)png_malloc(read_ptr,
+ png_get_rowbytes(read_ptr, read_info_ptr));
+ png_debug2(0, "0x%08lx (%ld bytes)\n", (unsigned long)row_buf,
+ png_get_rowbytes(read_ptr, read_info_ptr));
+#endif /* !SINGLE_ROWBUF_ALLOC */
+ png_read_rows(read_ptr, (png_bytepp)&row_buf, png_bytepp_NULL, 1);
+
+#ifdef PNG_WRITE_SUPPORTED
+#ifdef PNGTEST_TIMING
+ t_stop = (float)clock();
+ t_decode += (t_stop - t_start);
+ t_start = t_stop;
+#endif
png_write_rows(write_ptr, (png_bytepp)&row_buf, 1);
+#ifdef PNGTEST_TIMING
+ t_stop = (float)clock();
+ t_encode += (t_stop - t_start);
+ t_start = t_stop;
+#endif
+#endif /* PNG_WRITE_SUPPORTED */
+
+#ifndef SINGLE_ROWBUF_ALLOC
+ png_debug2(0, "Freeing row buffer (pass %d, y = %ld)\n\n", pass, y);
+ png_free(read_ptr, row_buf);
+#endif /* !SINGLE_ROWBUF_ALLOC */
}
}
+#if defined(PNG_READ_UNKNOWN_CHUNKS_SUPPORTED)
+ png_free_data(read_ptr, read_info_ptr, PNG_FREE_UNKN, -1);
+#endif
+#if defined(PNG_WRITE_UNKNOWN_CHUNKS_SUPPORTED)
+ png_free_data(write_ptr, write_info_ptr, PNG_FREE_UNKN, -1);
+#endif
+
png_debug(0, "Reading and writing end_info data\n");
+
png_read_end(read_ptr, end_info_ptr);
- png_write_end(write_ptr, end_info_ptr);
+#if defined(PNG_TEXT_SUPPORTED)
+ {
+ png_textp text_ptr;
+ int num_text;
+
+ if (png_get_text(read_ptr, end_info_ptr, &text_ptr, &num_text) > 0)
+ {
+ png_debug1(0, "Handling %d iTXt/tEXt/zTXt chunks\n", num_text);
+ png_set_text(write_ptr, write_end_info_ptr, text_ptr, num_text);
+ }
+ }
+#endif
+#if defined(PNG_tIME_SUPPORTED)
+ {
+ png_timep mod_time;
+
+ if (png_get_tIME(read_ptr, end_info_ptr, &mod_time))
+ {
+ png_set_tIME(write_ptr, write_end_info_ptr, mod_time);
+#if defined(PNG_TIME_RFC1123_SUPPORTED)
+ /* we have to use png_strcpy instead of "=" because the string
+ pointed to by png_convert_to_rfc1123() gets free'ed before
+ we use it */
+ png_strcpy(tIME_string,png_convert_to_rfc1123(read_ptr, mod_time));
+ tIME_chunk_present++;
+#endif /* PNG_TIME_RFC1123_SUPPORTED */
+ }
+ }
+#endif
+#if defined(PNG_WRITE_UNKNOWN_CHUNKS_SUPPORTED)
+ {
+ png_unknown_chunkp unknowns;
+ int num_unknowns;
+ num_unknowns = (int)png_get_unknown_chunks(read_ptr, end_info_ptr,
+ &unknowns);
+ if (num_unknowns)
+ {
+ png_size_t i;
+ png_set_unknown_chunks(write_ptr, write_end_info_ptr, unknowns,
+ num_unknowns);
+ /* copy the locations from the read_info_ptr. The automatically
+ generated locations in write_end_info_ptr are wrong because we
+ haven't written the end_info yet */
+ for (i = 0; i < (png_size_t)num_unknowns; i++)
+ png_set_unknown_chunk_location(write_ptr, write_end_info_ptr, i,
+ unknowns[i].location);
+ }
+ }
+#endif
+#ifdef PNG_WRITE_SUPPORTED
+ png_write_end(write_ptr, write_end_info_ptr);
+#endif
#ifdef PNG_EASY_ACCESS_SUPPORTED
if(verbose)
#endif
png_debug(0, "Destroying data structs\n");
+#ifdef SINGLE_ROWBUF_ALLOC
+ png_debug(1, "destroying row_buf for read_ptr\n");
png_free(read_ptr, row_buf);
+ row_buf=NULL;
+#endif /* SINGLE_ROWBUF_ALLOC */
+ png_debug(1, "destroying read_ptr, read_info_ptr, end_info_ptr\n");
png_destroy_read_struct(&read_ptr, &read_info_ptr, &end_info_ptr);
+#ifdef PNG_WRITE_SUPPORTED
+ png_debug(1, "destroying write_end_info_ptr\n");
+ png_destroy_info_struct(write_ptr, &write_end_info_ptr);
+ png_debug(1, "destroying write_ptr, write_info_ptr\n");
png_destroy_write_struct(&write_ptr, &write_info_ptr);
+#endif
+ png_debug(0, "Destruction complete.\n");
- fclose(fpin);
- fclose(fpout);
+ FCLOSE(fpin);
+ FCLOSE(fpout);
png_debug(0, "Opening files for comparison\n");
+#if defined(_WIN32_WCE)
+ MultiByteToWideChar(CP_ACP, 0, inname, -1, path, MAX_PATH);
+ if ((fpin = CreateFile(path, GENERIC_READ, 0, NULL, OPEN_EXISTING, 0, NULL)) == INVALID_HANDLE_VALUE)
+#else
if ((fpin = fopen(inname, "rb")) == NULL)
+#endif
{
fprintf(STDERR, "Could not find file %s\n", inname);
return (1);
}
+#if defined(_WIN32_WCE)
+ MultiByteToWideChar(CP_ACP, 0, outname, -1, path, MAX_PATH);
+ if ((fpout = CreateFile(path, GENERIC_READ, 0, NULL, OPEN_EXISTING, 0, NULL)) == INVALID_HANDLE_VALUE)
+#else
if ((fpout = fopen(outname, "rb")) == NULL)
+#endif
{
fprintf(STDERR, "Could not find file %s\n", outname);
- fclose(fpin);
+ FCLOSE(fpin);
return (1);
}
{
png_size_t num_in, num_out;
- num_in = fread(inbuf, 1, 1, fpin);
- num_out = fread(outbuf, 1, 1, fpout);
+ READFILE(fpin, inbuf, 1, num_in);
+ READFILE(fpout, outbuf, 1, num_out);
if (num_in != num_out)
{
- fprintf(STDERR, "Files %s and %s are of a different size\n",
+ fprintf(STDERR, "\nFiles %s and %s are of a different size\n",
inname, outname);
if(wrote_question == 0)
{
fprintf(STDERR,
- " Was %s written with the same chunk size (8k),",inname);
+ " Was %s written with the same maximum IDAT chunk size (%d bytes),",
+ inname,PNG_ZBUF_SIZE);
fprintf(STDERR,
- " filtering\n heuristic (libpng default), compression");
+ "\n filtering heuristic (libpng default), compression");
fprintf(STDERR,
- " level (zlib default)\n and zlib version (%s)?\n\n",
+ " level (zlib default),\n and zlib version (%s)?\n\n",
ZLIB_VERSION);
wrote_question=1;
}
- fclose(fpin);
- fclose(fpout);
+ FCLOSE(fpin);
+ FCLOSE(fpout);
return (0);
}
if (png_memcmp(inbuf, outbuf, num_in))
{
- fprintf(STDERR, "Files %s and %s are different\n", inname, outname);
+ fprintf(STDERR, "\nFiles %s and %s are different\n", inname, outname);
if(wrote_question == 0)
{
fprintf(STDERR,
- " Was %s written with the same chunk size (8k),",inname);
+ " Was %s written with the same maximum IDAT chunk size (%d bytes),",
+ inname,PNG_ZBUF_SIZE);
fprintf(STDERR,
- " filtering\n heuristic (libpng default), compression");
+ "\n filtering heuristic (libpng default), compression");
fprintf(STDERR,
- " level (zlib default)\n and zlib version (%s)?\n\n",
+ " level (zlib default),\n and zlib version (%s)?\n\n",
ZLIB_VERSION);
wrote_question=1;
}
- fclose(fpin);
- fclose(fpout);
+ FCLOSE(fpin);
+ FCLOSE(fpout);
return (0);
}
}
- fclose(fpin);
- fclose(fpout);
+ FCLOSE(fpin);
+ FCLOSE(fpout);
return (0);
}
/* input and output filenames */
#ifdef RISCOS
-PNG_CONST char *inname = "pngtest/png";
-PNG_CONST char *outname = "pngout/png";
+static PNG_CONST char *inname = "pngtest/png";
+static PNG_CONST char *outname = "pngout/png";
#else
static PNG_CONST char *inname = "pngtest.png";
static PNG_CONST char *outname = "pngout.png";
fprintf(STDERR, "Testing libpng version %s\n", PNG_LIBPNG_VER_STRING);
fprintf(STDERR, " with zlib version %s\n", ZLIB_VERSION);
fprintf(STDERR,"%s",png_get_copyright(NULL));
+ /* Show the version of libpng used in building the library */
+ fprintf(STDERR," library (%lu):%s", png_access_version_number(),
+ png_get_header_version(NULL));
+ /* Show the version of libpng used in building the application */
+ fprintf(STDERR," pngtest (%lu):%s", (unsigned long)PNG_LIBPNG_VER,
+ PNG_HEADER_VERSION_STRING);
+ fprintf(STDERR," sizeof(png_struct)=%ld, sizeof(png_info)=%ld\n",
+ (long)sizeof(png_struct), (long)sizeof(png_info));
/* Do some consistency checking on the memory allocation settings, I'm
not sure this matters, but it is nice to know, the first of these
#endif
for (i=2; i<argc; ++i)
{
+#if defined(PNG_READ_USER_TRANSFORM_SUPPORTED)
+ int k;
+#endif
int kerror;
fprintf(STDERR, "Testing %s:",argv[i]);
kerror = test_one_file(argv[i], outname);
if (kerror == 0)
{
#if defined(PNG_WRITE_USER_TRANSFORM_SUPPORTED)
- fprintf(STDERR, " PASS (%lu zero samples)\n",zero_samples);
+ fprintf(STDERR, "\n PASS (%lu zero samples)\n",zero_samples);
#else
fprintf(STDERR, " PASS\n");
#endif
+#if defined(PNG_READ_USER_TRANSFORM_SUPPORTED)
+ for (k=0; k<256; k++)
+ if(filters_used[k])
+ fprintf(STDERR, " Filter %d was used %lu times\n",
+ k,filters_used[k]);
+#endif
#if defined(PNG_TIME_RFC1123_SUPPORTED)
if(tIME_chunk_present != 0)
fprintf(STDERR, " tIME = %s\n",tIME_string);
if (allocation_now != current_allocation)
fprintf(STDERR, "MEMORY ERROR: %d bytes lost\n",
current_allocation-allocation_now);
- if (current_allocation != 0) {
+ if (current_allocation != 0)
+ {
memory_infop pinfo = pinformation;
fprintf(STDERR, "MEMORY ERROR: %d bytes still allocated\n",
current_allocation);
- while (pinfo != NULL) {
- fprintf(STDERR, " %d bytes at %x\n", pinfo->size, pinfo->pointer);
+ while (pinfo != NULL)
+ {
+ fprintf(STDERR, " %lu bytes at %x\n", pinfo->size,
+ (unsigned int) pinfo->pointer);
pinfo = pinfo->next;
- }
+ }
}
#endif
}
#ifdef PNG_USER_MEM_SUPPORTED
- fprintf(STDERR, "Maximum memory allocation: %d bytes\n",
+ fprintf(STDERR, " Current memory allocation: %10d bytes\n",
+ current_allocation);
+ fprintf(STDERR, " Maximum memory allocation: %10d bytes\n",
maximum_allocation);
+ fprintf(STDERR, " Total memory allocation: %10d bytes\n",
+ total_allocation);
+ fprintf(STDERR, " Number of allocations: %10d\n",
+ num_allocations);
#endif
}
else
{
int i;
- for (i=0; i<3; ++i) {
+ for (i=0; i<3; ++i)
+ {
int kerror;
#ifdef PNG_USER_MEM_SUPPORTED
int allocation_now = current_allocation;
{
if(verbose == 1 || i == 2)
{
+#if defined(PNG_READ_USER_TRANSFORM_SUPPORTED)
+ int k;
+#endif
#if defined(PNG_WRITE_USER_TRANSFORM_SUPPORTED)
- fprintf(STDERR, " PASS (%lu zero samples)\n",zero_samples);
+ fprintf(STDERR, "\n PASS (%lu zero samples)\n",zero_samples);
#else
fprintf(STDERR, " PASS\n");
#endif
+#if defined(PNG_READ_USER_TRANSFORM_SUPPORTED)
+ for (k=0; k<256; k++)
+ if(filters_used[k])
+ fprintf(STDERR, " Filter %d was used %lu times\n",
+ k,filters_used[k]);
+#endif
#if defined(PNG_TIME_RFC1123_SUPPORTED)
- if(tIME_chunk_present != 0)
- fprintf(STDERR, " tIME = %s\n",tIME_string);
+ if(tIME_chunk_present != 0)
+ fprintf(STDERR, " tIME = %s\n",tIME_string);
#endif /* PNG_TIME_RFC1123_SUPPORTED */
}
}
if (allocation_now != current_allocation)
fprintf(STDERR, "MEMORY ERROR: %d bytes lost\n",
current_allocation-allocation_now);
- if (current_allocation != 0) {
+ if (current_allocation != 0)
+ {
memory_infop pinfo = pinformation;
fprintf(STDERR, "MEMORY ERROR: %d bytes still allocated\n",
current_allocation);
- while (pinfo != NULL) {
- fprintf(STDERR, " %d bytes at %x\n", pinfo->size, pinfo->pointer);
+ while (pinfo != NULL)
+ {
+ fprintf(STDERR," %lu bytes at %x\n",
+ pinfo->size, (unsigned int)pinfo->pointer);
pinfo = pinfo->next;
}
}
#endif
}
#ifdef PNG_USER_MEM_SUPPORTED
- fprintf(STDERR, "Maximum memory allocation: %d bytes\n",
+ fprintf(STDERR, " Current memory allocation: %10d bytes\n",
+ current_allocation);
+ fprintf(STDERR, " Maximum memory allocation: %10d bytes\n",
maximum_allocation);
+ fprintf(STDERR, " Total memory allocation: %10d bytes\n",
+ total_allocation);
+ fprintf(STDERR, " Number of allocations: %10d\n",
+ num_allocations);
#endif
}
+#ifdef PNGTEST_TIMING
+ t_stop = (float)clock();
+ t_misc += (t_stop - t_start);
+ t_start = t_stop;
+ fprintf(STDERR," CPU time used = %.3f seconds",
+ (t_misc+t_decode+t_encode)/(float)CLOCKS_PER_SEC);
+ fprintf(STDERR," (decoding %.3f,\n",
+ t_decode/(float)CLOCKS_PER_SEC);
+ fprintf(STDERR," encoding %.3f ,",
+ t_encode/(float)CLOCKS_PER_SEC);
+ fprintf(STDERR," other %.3f seconds)\n\n",
+ t_misc/(float)CLOCKS_PER_SEC);
+#endif
+
if (ierror == 0)
fprintf(STDERR, "libpng passes test\n");
else
return (int)(ierror != 0);
}
+/* Generate a compiler error if there is an old png.h in the search path. */
+typedef version_1_2_4 your_png_h_is_not_version_1_2_4;
/* pngtrans.c - transforms the data in a row (used by both readers and writers)
*
- * libpng 1.0.3 - January 14, 1999
+ * libpng 1.2.4 - July 8, 2002
* For conditions of distribution and use, see copyright notice in png.h
- * Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.
- * Copyright (c) 1996, 1997 Andreas Dilger
- * Copyright (c) 1998, 1999 Glenn Randers-Pehrson
+ * Copyright (c) 1998-2002 Glenn Randers-Pehrson
+ * (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger)
+ * (Version 0.88 Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.)
*/
#define PNG_INTERNAL
#include "png.h"
#if defined(PNG_READ_BGR_SUPPORTED) || defined(PNG_WRITE_BGR_SUPPORTED)
-/* turn on bgr to rgb mapping */
-void
+/* turn on BGR-to-RGB mapping */
+void PNGAPI
png_set_bgr(png_structp png_ptr)
{
png_debug(1, "in png_set_bgr\n");
#if defined(PNG_READ_SWAP_SUPPORTED) || defined(PNG_WRITE_SWAP_SUPPORTED)
/* turn on 16 bit byte swapping */
-void
+void PNGAPI
png_set_swap(png_structp png_ptr)
{
png_debug(1, "in png_set_swap\n");
#if defined(PNG_READ_PACK_SUPPORTED) || defined(PNG_WRITE_PACK_SUPPORTED)
/* turn on pixel packing */
-void
+void PNGAPI
png_set_packing(png_structp png_ptr)
{
png_debug(1, "in png_set_packing\n");
#if defined(PNG_READ_PACKSWAP_SUPPORTED)||defined(PNG_WRITE_PACKSWAP_SUPPORTED)
/* turn on packed pixel swapping */
-void
+void PNGAPI
png_set_packswap(png_structp png_ptr)
{
png_debug(1, "in png_set_packswap\n");
#endif
#if defined(PNG_READ_SHIFT_SUPPORTED) || defined(PNG_WRITE_SHIFT_SUPPORTED)
-void
+void PNGAPI
png_set_shift(png_structp png_ptr, png_color_8p true_bits)
{
png_debug(1, "in png_set_shift\n");
#if defined(PNG_READ_INTERLACING_SUPPORTED) || \
defined(PNG_WRITE_INTERLACING_SUPPORTED)
-int
+int PNGAPI
png_set_interlace_handling(png_structp png_ptr)
{
png_debug(1, "in png_set_interlace handling\n");
* for 48-bit input data, as well as to avoid problems with some compilers
* that don't like bytes as parameters.
*/
-void
+void PNGAPI
png_set_filler(png_structp png_ptr, png_uint_32 filler, int filler_loc)
{
png_debug(1, "in png_set_filler\n");
#if defined(PNG_READ_SWAP_ALPHA_SUPPORTED) || \
defined(PNG_WRITE_SWAP_ALPHA_SUPPORTED)
-void
+void PNGAPI
png_set_swap_alpha(png_structp png_ptr)
{
png_debug(1, "in png_set_swap_alpha\n");
#if defined(PNG_READ_INVERT_ALPHA_SUPPORTED) || \
defined(PNG_WRITE_INVERT_ALPHA_SUPPORTED)
-void
+void PNGAPI
png_set_invert_alpha(png_structp png_ptr)
{
png_debug(1, "in png_set_invert_alpha\n");
#endif
#if defined(PNG_READ_INVERT_SUPPORTED) || defined(PNG_WRITE_INVERT_SUPPORTED)
-void
+void PNGAPI
png_set_invert_mono(png_structp png_ptr)
{
png_debug(1, "in png_set_invert_mono\n");
}
/* invert monochrome grayscale data */
-void
+void /* PRIVATE */
png_do_invert(png_row_infop row_info, png_bytep row)
{
png_debug(1, "in png_do_invert\n");
- if (row_info->bit_depth == 1 &&
+ /* This test removed from libpng version 1.0.13 and 1.2.0:
+ * if (row_info->bit_depth == 1 &&
+ */
#if defined(PNG_USELESS_TESTS_SUPPORTED)
- row != NULL && row_info != NULL &&
+ if (row == NULL || row_info == NULL)
+ return;
#endif
- row_info->color_type == PNG_COLOR_TYPE_GRAY)
+ if (row_info->color_type == PNG_COLOR_TYPE_GRAY)
{
png_bytep rp = row;
png_uint_32 i;
rp++;
}
}
+ else if (row_info->color_type == PNG_COLOR_TYPE_GRAY_ALPHA &&
+ row_info->bit_depth == 8)
+ {
+ png_bytep rp = row;
+ png_uint_32 i;
+ png_uint_32 istop = row_info->rowbytes;
+
+ for (i = 0; i < istop; i+=2)
+ {
+ *rp = (png_byte)(~(*rp));
+ rp+=2;
+ }
+ }
+ else if (row_info->color_type == PNG_COLOR_TYPE_GRAY_ALPHA &&
+ row_info->bit_depth == 16)
+ {
+ png_bytep rp = row;
+ png_uint_32 i;
+ png_uint_32 istop = row_info->rowbytes;
+
+ for (i = 0; i < istop; i+=4)
+ {
+ *rp = (png_byte)(~(*rp));
+ *(rp+1) = (png_byte)(~(*(rp+1)));
+ rp+=4;
+ }
+ }
}
#endif
#if defined(PNG_READ_SWAP_SUPPORTED) || defined(PNG_WRITE_SWAP_SUPPORTED)
/* swaps byte order on 16 bit depth images */
-void
+void /* PRIVATE */
png_do_swap(png_row_infop row_info, png_bytep row)
{
png_debug(1, "in png_do_swap\n");
};
/* swaps pixel packing order within bytes */
-void
+void /* PRIVATE */
png_do_packswap(png_row_infop row_info, png_bytep row)
{
png_debug(1, "in png_do_packswap\n");
#if defined(PNG_WRITE_FILLER_SUPPORTED) || \
defined(PNG_READ_STRIP_ALPHA_SUPPORTED)
/* remove filler or alpha byte(s) */
-void
+void /* PRIVATE */
png_do_strip_filler(png_row_infop row_info, png_bytep row, png_uint_32 flags)
{
png_debug(1, "in png_do_strip_filler\n");
sp += 8; dp += 6;
for (i = 1; i < row_width; i++)
{
- /* This could be (although memcpy is probably slower):
+ /* This could be (although png_memcpy is probably slower):
png_memcpy(dp, sp, 6);
sp += 8;
dp += 6;
*/
+
*dp++ = *sp++;
*dp++ = *sp++;
*dp++ = *sp++;
/* This converts from XXRRGGBB or AARRGGBB to RRGGBB */
for (i = 0; i < row_width; i++)
{
- /* This could be (although memcpy is probably slower):
+ /* This could be (although png_memcpy is probably slower):
png_memcpy(dp, sp, 6);
sp += 8;
dp += 6;
*/
+
sp+=2;
*dp++ = *sp++;
*dp++ = *sp++;
#if defined(PNG_READ_BGR_SUPPORTED) || defined(PNG_WRITE_BGR_SUPPORTED)
/* swaps red and blue bytes within a pixel */
-void
+void /* PRIVATE */
png_do_bgr(png_row_infop row_info, png_bytep row)
{
png_debug(1, "in png_do_bgr\n");
}
#endif /* PNG_READ_BGR_SUPPORTED or PNG_WRITE_BGR_SUPPORTED */
+#if defined(PNG_READ_USER_TRANSFORM_SUPPORTED) || \
+ defined(PNG_WRITE_USER_TRANSFORM_SUPPORTED) || \
+ defined(PNG_LEGACY_SUPPORTED)
+void PNGAPI
+png_set_user_transform_info(png_structp png_ptr, png_voidp
+ user_transform_ptr, int user_transform_depth, int user_transform_channels)
+{
+ png_debug(1, "in png_set_user_transform_info\n");
+#if defined(PNG_USER_TRANSFORM_PTR_SUPPORTED)
+ png_ptr->user_transform_ptr = user_transform_ptr;
+ png_ptr->user_transform_depth = (png_byte)user_transform_depth;
+ png_ptr->user_transform_channels = (png_byte)user_transform_channels;
+#else
+ if(user_transform_ptr || user_transform_depth || user_transform_channels)
+ png_warning(png_ptr,
+ "This version of libpng does not support user transform info");
+#endif
+}
+#endif
+
+/* This function returns a pointer to the user_transform_ptr associated with
+ * the user transform functions. The application should free any memory
+ * associated with this pointer before png_write_destroy and png_read_destroy
+ * are called.
+ */
+png_voidp PNGAPI
+png_get_user_transform_ptr(png_structp png_ptr)
+{
+#if defined(PNG_USER_TRANSFORM_PTR_SUPPORTED)
+ return ((png_voidp)png_ptr->user_transform_ptr);
+#else
+ if(png_ptr)
+ return (NULL);
+ return (NULL);
+#endif
+}
/* pngwio.c - functions for data output
*
- * libpng 1.0.3 - January 14, 1999
+ * libpng 1.2.4 - July 8, 2002
* For conditions of distribution and use, see copyright notice in png.h
- * Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.
- * Copyright (c) 1996, 1997 Andreas Dilger
- * Copyright (c) 1998, 1999 Glenn Randers-Pehrson
+ * Copyright (c) 1998-2002 Glenn Randers-Pehrson
+ * (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger)
+ * (Version 0.88 Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.)
*
* This file provides a location for all output. Users who need
* special handling are expected to write functions that have the same
#define PNG_INTERNAL
#include "png.h"
+#ifdef PNG_WRITE_SUPPORTED
/* Write the data to whatever output you are using. The default routine
writes to a file pointer. Note that this routine sometimes gets called
buffering if you are using unbuffered writes. This should never be asked
to write more than 64K on a 16 bit machine. */
-void
+void /* PRIVATE */
png_write_data(png_structp png_ptr, png_bytep data, png_size_t length)
{
if (png_ptr->write_data_fn != NULL )
write_data function and use it at run time with png_set_write_fn(), rather
than changing the library. */
#ifndef USE_FAR_KEYWORD
-#ifdef __VISAGECPP__
-static void _Optlink
+void PNGAPI
png_default_write_data(png_structp png_ptr, png_bytep data, png_size_t length)
-#else
-static void
-png_default_write_data(png_structp png_ptr, png_bytep data, png_size_t length)
-#endif
{
png_uint_32 check;
- check = fwrite(data, 1, length, (FILE *)(png_ptr->io_ptr));
+#if defined(_WIN32_WCE)
+ if ( !WriteFile((HANDLE)(png_ptr->io_ptr), data, length, &check, NULL) )
+ check = 0;
+#else
+ check = fwrite(data, 1, length, (png_FILE_p)(png_ptr->io_ptr));
+#endif
if (check != length)
- {
png_error(png_ptr, "Write Error");
- }
}
#else
/* this is the model-independent version. Since the standard I/O library
#define NEAR_BUF_SIZE 1024
#define MIN(a,b) (a <= b ? a : b)
-#ifdef __VISAGECPP__
-static void _Optlink
+void PNGAPI
png_default_write_data(png_structp png_ptr, png_bytep data, png_size_t length)
-#else
-static void
-png_default_write_data(png_structp png_ptr, png_bytep data, png_size_t length)
-#endif
{
png_uint_32 check;
png_byte *near_data; /* Needs to be "png_byte *" instead of "png_bytep" */
- FILE *io_ptr;
+ png_FILE_p io_ptr;
/* Check if data really is near. If so, use usual code. */
near_data = (png_byte *)CVT_PTR_NOCHECK(data);
- io_ptr = (FILE *)CVT_PTR(png_ptr->io_ptr);
+ io_ptr = (png_FILE_p)CVT_PTR(png_ptr->io_ptr);
if ((png_bytep)near_data == data)
{
+#if defined(_WIN32_WCE)
+ if ( !WriteFile(io_ptr, near_data, length, &check, NULL) )
+ check = 0;
+#else
check = fwrite(near_data, 1, length, io_ptr);
+#endif
}
else
{
{
written = MIN(NEAR_BUF_SIZE, remaining);
png_memcpy(buf, data, written); /* copy far buffer to near buffer */
+#if defined(_WIN32_WCE)
+ if ( !WriteFile(io_ptr, buf, written, &err, NULL) )
+ err = 0;
+#else
err = fwrite(buf, 1, written, io_ptr);
+#endif
if (err != written)
break;
else
while (remaining != 0);
}
if (check != length)
- {
png_error(png_ptr, "Write Error");
- }
}
#endif
to disk). After png_flush is called, there should be no data pending
writing in any buffers. */
#if defined(PNG_WRITE_FLUSH_SUPPORTED)
-void
+void /* PRIVATE */
png_flush(png_structp png_ptr)
{
if (png_ptr->output_flush_fn != NULL)
}
#if !defined(PNG_NO_STDIO)
-#ifdef __VISAGECPP__
-static void _Optlink
-png_default_flush(png_structp png_ptr)
-#else
-static void
+void PNGAPI
png_default_flush(png_structp png_ptr)
-#endif
{
- FILE *io_ptr;
- io_ptr = (FILE *)CVT_PTR((png_ptr->io_ptr));
+#if !defined(_WIN32_WCE)
+ png_FILE_p io_ptr;
+ io_ptr = (png_FILE_p)CVT_PTR((png_ptr->io_ptr));
if (io_ptr != NULL)
fflush(io_ptr);
+#endif
}
#endif
#endif
PNG_WRITE_FLUSH_SUPPORTED is not defined at libpng compile
time, output_flush_fn will be ignored, although it must be
supplied for compatibility. */
-void
+void PNGAPI
png_set_write_fn(png_structp png_ptr, png_voidp io_ptr,
png_rw_ptr write_data_fn, png_flush_ptr output_flush_fn)
{
}
# endif
# endif
+#endif /* PNG_WRITE_SUPPORTED */
/* pngwrite.c - general routines to write a PNG file
*
- * libpng 1.0.3 - January 14, 1999
+ * libpng 1.2.4 - July 8, 2002
* For conditions of distribution and use, see copyright notice in png.h
- * Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.
- * Copyright (c) 1996, 1997 Andreas Dilger
- * Copyright (c) 1998, 1999 Glenn Randers-Pehrson
+ * Copyright (c) 1998-2002 Glenn Randers-Pehrson
+ * (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger)
+ * (Version 0.88 Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.)
*/
/* get internal access to png.h */
#define PNG_INTERNAL
#include "png.h"
+#ifdef PNG_WRITE_SUPPORTED
/* Writes all the PNG information. This is the suggested way to use the
* library. If you have a new chunk to add, make a function to write it,
* write a plain PNG file. If you have long comments, I suggest writing
* them in png_write_end(), and compressing them.
*/
-void
-png_write_info(png_structp png_ptr, png_infop info_ptr)
+void PNGAPI
+png_write_info_before_PLTE(png_structp png_ptr, png_infop info_ptr)
{
-#if defined(PNG_WRITE_tEXt_SUPPORTED) || defined(PNG_WRITE_zTXt_SUPPORTED)
- int i;
-#endif
-
- png_debug(1, "in png_write_info\n");
+ png_debug(1, "in png_write_info_before_PLTE\n");
+ if (!(png_ptr->mode & PNG_WROTE_INFO_BEFORE_PLTE))
+ {
png_write_sig(png_ptr); /* write PNG signature */
+#if defined(PNG_MNG_FEATURES_SUPPORTED)
+ if((png_ptr->mode&PNG_HAVE_PNG_SIGNATURE)&&(png_ptr->mng_features_permitted))
+ {
+ png_warning(png_ptr,"MNG features are not allowed in a PNG datastream\n");
+ png_ptr->mng_features_permitted=0;
+ }
+#endif
/* write IHDR information. */
png_write_IHDR(png_ptr, info_ptr->width, info_ptr->height,
info_ptr->bit_depth, info_ptr->color_type, info_ptr->compression_type,
flag set, and if it does, writes the chunk. */
#if defined(PNG_WRITE_gAMA_SUPPORTED)
if (info_ptr->valid & PNG_INFO_gAMA)
+ {
+# ifdef PNG_FLOATING_POINT_SUPPORTED
png_write_gAMA(png_ptr, info_ptr->gamma);
+#else
+#ifdef PNG_FIXED_POINT_SUPPORTED
+ png_write_gAMA_fixed(png_ptr, info_ptr->int_gamma);
+# endif
+#endif
+ }
#endif
#if defined(PNG_WRITE_sRGB_SUPPORTED)
if (info_ptr->valid & PNG_INFO_sRGB)
png_write_sRGB(png_ptr, (int)info_ptr->srgb_intent);
#endif
+#if defined(PNG_WRITE_iCCP_SUPPORTED)
+ if (info_ptr->valid & PNG_INFO_iCCP)
+ png_write_iCCP(png_ptr, info_ptr->iccp_name, PNG_COMPRESSION_TYPE_BASE,
+ info_ptr->iccp_profile, (int)info_ptr->iccp_proflen);
+#endif
#if defined(PNG_WRITE_sBIT_SUPPORTED)
if (info_ptr->valid & PNG_INFO_sBIT)
png_write_sBIT(png_ptr, &(info_ptr->sig_bit), info_ptr->color_type);
#endif
#if defined(PNG_WRITE_cHRM_SUPPORTED)
if (info_ptr->valid & PNG_INFO_cHRM)
+ {
+#ifdef PNG_FLOATING_POINT_SUPPORTED
png_write_cHRM(png_ptr,
info_ptr->x_white, info_ptr->y_white,
info_ptr->x_red, info_ptr->y_red,
info_ptr->x_green, info_ptr->y_green,
info_ptr->x_blue, info_ptr->y_blue);
+#else
+# ifdef PNG_FIXED_POINT_SUPPORTED
+ png_write_cHRM_fixed(png_ptr,
+ info_ptr->int_x_white, info_ptr->int_y_white,
+ info_ptr->int_x_red, info_ptr->int_y_red,
+ info_ptr->int_x_green, info_ptr->int_y_green,
+ info_ptr->int_x_blue, info_ptr->int_y_blue);
+# endif
#endif
+ }
+#endif
+#if defined(PNG_WRITE_UNKNOWN_CHUNKS_SUPPORTED)
+ if (info_ptr->unknown_chunks_num)
+ {
+ png_unknown_chunk *up;
+
+ png_debug(5, "writing extra chunks\n");
+
+ for (up = info_ptr->unknown_chunks;
+ up < info_ptr->unknown_chunks + info_ptr->unknown_chunks_num;
+ up++)
+ {
+ int keep=png_handle_as_unknown(png_ptr, up->name);
+ if (keep != HANDLE_CHUNK_NEVER &&
+ up->location && (!(up->location & PNG_HAVE_PLTE)) &&
+ ((up->name[3] & 0x20) || keep == HANDLE_CHUNK_ALWAYS ||
+ (png_ptr->flags & PNG_FLAG_KEEP_UNSAFE_CHUNKS)))
+ {
+ png_write_chunk(png_ptr, up->name, up->data, up->size);
+ }
+ }
+ }
+#endif
+ png_ptr->mode |= PNG_WROTE_INFO_BEFORE_PLTE;
+ }
+}
+
+void PNGAPI
+png_write_info(png_structp png_ptr, png_infop info_ptr)
+{
+#if defined(PNG_WRITE_TEXT_SUPPORTED) || defined(PNG_WRITE_sPLT_SUPPORTED)
+ int i;
+#endif
+
+ png_debug(1, "in png_write_info\n");
+
+ png_write_info_before_PLTE(png_ptr, info_ptr);
+
if (info_ptr->valid & PNG_INFO_PLTE)
png_write_PLTE(png_ptr, info_ptr->palette,
(png_uint_32)info_ptr->num_palette);
{
#if defined(PNG_WRITE_INVERT_ALPHA_SUPPORTED)
/* invert the alpha channel (in tRNS) */
- if (png_ptr->transformations & PNG_INVERT_ALPHA &&
+ if ((png_ptr->transformations & PNG_INVERT_ALPHA) &&
info_ptr->color_type == PNG_COLOR_TYPE_PALETTE)
{
int j;
for (j=0; j<(int)info_ptr->num_trans; j++)
- info_ptr->trans[j] = 255 - info_ptr->trans[j];
+ info_ptr->trans[j] = (png_byte)(255 - info_ptr->trans[j]);
}
#endif
png_write_tRNS(png_ptr, info_ptr->trans, &(info_ptr->trans_values),
info_ptr->pcal_X1, info_ptr->pcal_type, info_ptr->pcal_nparams,
info_ptr->pcal_units, info_ptr->pcal_params);
#endif
+#if defined(PNG_WRITE_sCAL_SUPPORTED)
+ if (info_ptr->valid & PNG_INFO_sCAL)
+#if defined(PNG_FLOATING_POINT_SUPPORTED) && !defined(PNG_NO_STDIO)
+ png_write_sCAL(png_ptr, (int)info_ptr->scal_unit,
+ info_ptr->scal_pixel_width, info_ptr->scal_pixel_height);
+#else
+#ifdef PNG_FIXED_POINT_SUPPORTED
+ png_write_sCAL_s(png_ptr, (int)info_ptr->scal_unit,
+ info_ptr->scal_s_width, info_ptr->scal_s_height);
+#else
+ png_warning(png_ptr,
+ "png_write_sCAL not supported; sCAL chunk not written.\n");
+#endif
+#endif
+#endif
#if defined(PNG_WRITE_pHYs_SUPPORTED)
if (info_ptr->valid & PNG_INFO_pHYs)
png_write_pHYs(png_ptr, info_ptr->x_pixels_per_unit,
if (info_ptr->valid & PNG_INFO_tIME)
{
png_write_tIME(png_ptr, &(info_ptr->mod_time));
- png_ptr->flags |= PNG_FLAG_WROTE_tIME;
+ png_ptr->mode |= PNG_WROTE_tIME;
}
#endif
-#if defined(PNG_WRITE_tEXt_SUPPORTED) || defined(PNG_WRITE_zTXt_SUPPORTED)
+#if defined(PNG_WRITE_sPLT_SUPPORTED)
+ if (info_ptr->valid & PNG_INFO_sPLT)
+ for (i = 0; i < (int)info_ptr->splt_palettes_num; i++)
+ png_write_sPLT(png_ptr, info_ptr->splt_palettes + i);
+#endif
+#if defined(PNG_WRITE_TEXT_SUPPORTED)
/* Check to see if we need to write text chunks */
for (i = 0; i < info_ptr->num_text; i++)
{
png_debug2(2, "Writing header text chunk %d, type %d\n", i,
info_ptr->text[i].compression);
+ /* an internationalized chunk? */
+ if (info_ptr->text[i].compression > 0)
+ {
+#if defined(PNG_WRITE_iTXt_SUPPORTED)
+ /* write international chunk */
+ png_write_iTXt(png_ptr,
+ info_ptr->text[i].compression,
+ info_ptr->text[i].key,
+ info_ptr->text[i].lang,
+ info_ptr->text[i].lang_key,
+ info_ptr->text[i].text);
+#else
+ png_warning(png_ptr, "Unable to write international text\n");
+#endif
+ /* Mark this chunk as written */
+ info_ptr->text[i].compression = PNG_TEXT_COMPRESSION_NONE_WR;
+ }
/* If we want a compressed text chunk */
- if (info_ptr->text[i].compression >= PNG_TEXT_COMPRESSION_zTXt)
+ else if (info_ptr->text[i].compression == PNG_TEXT_COMPRESSION_zTXt)
{
#if defined(PNG_WRITE_zTXt_SUPPORTED)
/* write compressed chunk */
png_write_zTXt(png_ptr, info_ptr->text[i].key,
- info_ptr->text[i].text, info_ptr->text[i].text_length,
+ info_ptr->text[i].text, 0,
info_ptr->text[i].compression);
#else
png_warning(png_ptr, "Unable to write compressed text\n");
#if defined(PNG_WRITE_tEXt_SUPPORTED)
/* write uncompressed chunk */
png_write_tEXt(png_ptr, info_ptr->text[i].key,
- info_ptr->text[i].text, info_ptr->text[i].text_length);
+ info_ptr->text[i].text,
+ 0);
#else
png_warning(png_ptr, "Unable to write uncompressed text\n");
#endif
}
}
#endif
+#if defined(PNG_WRITE_UNKNOWN_CHUNKS_SUPPORTED)
+ if (info_ptr->unknown_chunks_num)
+ {
+ png_unknown_chunk *up;
+
+ png_debug(5, "writing extra chunks\n");
+
+ for (up = info_ptr->unknown_chunks;
+ up < info_ptr->unknown_chunks + info_ptr->unknown_chunks_num;
+ up++)
+ {
+ int keep=png_handle_as_unknown(png_ptr, up->name);
+ if (keep != HANDLE_CHUNK_NEVER &&
+ up->location && (up->location & PNG_HAVE_PLTE) &&
+ !(up->location & PNG_HAVE_IDAT) &&
+ ((up->name[3] & 0x20) || keep == HANDLE_CHUNK_ALWAYS ||
+ (png_ptr->flags & PNG_FLAG_KEEP_UNSAFE_CHUNKS)))
+ {
+ png_write_chunk(png_ptr, up->name, up->data, up->size);
+ }
+ }
+ }
+#endif
}
/* Writes the end of the PNG file. If you don't want to write comments or
* in png_write_info(), do not write them again here. If you have long
* comments, I suggest writing them here, and compressing them.
*/
-void
+void PNGAPI
png_write_end(png_structp png_ptr, png_infop info_ptr)
{
png_debug(1, "in png_write_end\n");
/* see if user wants us to write information chunks */
if (info_ptr != NULL)
{
-#if defined(PNG_WRITE_tEXt_SUPPORTED) || defined(PNG_WRITE_zTXt_SUPPORTED)
+#if defined(PNG_WRITE_TEXT_SUPPORTED)
int i; /* local index variable */
#endif
#if defined(PNG_WRITE_tIME_SUPPORTED)
/* check to see if user has supplied a time chunk */
- if (info_ptr->valid & PNG_INFO_tIME &&
- !(png_ptr->flags & PNG_FLAG_WROTE_tIME))
+ if ((info_ptr->valid & PNG_INFO_tIME) &&
+ !(png_ptr->mode & PNG_WROTE_tIME))
png_write_tIME(png_ptr, &(info_ptr->mod_time));
#endif
-#if defined(PNG_WRITE_tEXt_SUPPORTED) || defined(PNG_WRITE_zTXt_SUPPORTED)
+#if defined(PNG_WRITE_TEXT_SUPPORTED)
/* loop through comment chunks */
for (i = 0; i < info_ptr->num_text; i++)
{
png_debug2(2, "Writing trailer text chunk %d, type %d\n", i,
info_ptr->text[i].compression);
- if (info_ptr->text[i].compression >= PNG_TEXT_COMPRESSION_zTXt)
+ /* an internationalized chunk? */
+ if (info_ptr->text[i].compression > 0)
+ {
+#if defined(PNG_WRITE_iTXt_SUPPORTED)
+ /* write international chunk */
+ png_write_iTXt(png_ptr,
+ info_ptr->text[i].compression,
+ info_ptr->text[i].key,
+ info_ptr->text[i].lang,
+ info_ptr->text[i].lang_key,
+ info_ptr->text[i].text);
+#else
+ png_warning(png_ptr, "Unable to write international text\n");
+#endif
+ /* Mark this chunk as written */
+ info_ptr->text[i].compression = PNG_TEXT_COMPRESSION_NONE_WR;
+ }
+ else if (info_ptr->text[i].compression >= PNG_TEXT_COMPRESSION_zTXt)
{
#if defined(PNG_WRITE_zTXt_SUPPORTED)
/* write compressed chunk */
png_write_zTXt(png_ptr, info_ptr->text[i].key,
- info_ptr->text[i].text, info_ptr->text[i].text_length,
+ info_ptr->text[i].text, 0,
info_ptr->text[i].compression);
#else
png_warning(png_ptr, "Unable to write compressed text\n");
#if defined(PNG_WRITE_tEXt_SUPPORTED)
/* write uncompressed chunk */
png_write_tEXt(png_ptr, info_ptr->text[i].key,
- info_ptr->text[i].text, info_ptr->text[i].text_length);
+ info_ptr->text[i].text, 0);
#else
png_warning(png_ptr, "Unable to write uncompressed text\n");
#endif
info_ptr->text[i].compression = PNG_TEXT_COMPRESSION_NONE_WR;
}
}
+#endif
+#if defined(PNG_WRITE_UNKNOWN_CHUNKS_SUPPORTED)
+ if (info_ptr->unknown_chunks_num)
+ {
+ png_unknown_chunk *up;
+
+ png_debug(5, "writing extra chunks\n");
+
+ for (up = info_ptr->unknown_chunks;
+ up < info_ptr->unknown_chunks + info_ptr->unknown_chunks_num;
+ up++)
+ {
+ int keep=png_handle_as_unknown(png_ptr, up->name);
+ if (keep != HANDLE_CHUNK_NEVER &&
+ up->location && (up->location & PNG_AFTER_IDAT) &&
+ ((up->name[3] & 0x20) || keep == HANDLE_CHUNK_ALWAYS ||
+ (png_ptr->flags & PNG_FLAG_KEEP_UNSAFE_CHUNKS)))
+ {
+ png_write_chunk(png_ptr, up->name, up->data, up->size);
+ }
+ }
+ }
#endif
}
/* write end of PNG file */
png_write_IEND(png_ptr);
+#if 0
+/* This flush, added in libpng-1.0.8, causes some applications to crash
+ because they do not set png_ptr->output_flush_fn */
+ png_flush(png_ptr);
+#endif
}
#if defined(PNG_WRITE_tIME_SUPPORTED)
-void
+#if !defined(_WIN32_WCE)
+/* "time.h" functions are not supported on WindowsCE */
+void PNGAPI
png_convert_from_struct_tm(png_timep ptime, struct tm FAR * ttime)
{
png_debug(1, "in png_convert_from_struct_tm\n");
ptime->second = (png_byte)ttime->tm_sec;
}
-void
+void PNGAPI
png_convert_from_time_t(png_timep ptime, time_t ttime)
{
struct tm *tbuf;
png_convert_from_struct_tm(ptime, tbuf);
}
#endif
+#endif
/* Initialize png_ptr structure, and allocate any memory needed */
-png_structp
+png_structp PNGAPI
png_create_write_struct(png_const_charp user_png_ver, png_voidp error_ptr,
png_error_ptr error_fn, png_error_ptr warn_fn)
{
#ifdef PNG_USER_MEM_SUPPORTED
return (png_create_write_struct_2(user_png_ver, error_ptr, error_fn,
- warn_fn, NULL, NULL, NULL));
+ warn_fn, png_voidp_NULL, png_malloc_ptr_NULL, png_free_ptr_NULL));
}
/* Alternate initialize png_ptr structure, and allocate any memory needed */
-png_structp
+png_structp PNGAPI
png_create_write_struct_2(png_const_charp user_png_ver, png_voidp error_ptr,
png_error_ptr error_fn, png_error_ptr warn_fn, png_voidp mem_ptr,
png_malloc_ptr malloc_fn, png_free_ptr free_fn)
{
#endif /* PNG_USER_MEM_SUPPORTED */
png_structp png_ptr;
+#ifdef PNG_SETJMP_SUPPORTED
#ifdef USE_FAR_KEYWORD
jmp_buf jmpbuf;
#endif
+#endif
+ int i;
png_debug(1, "in png_create_write_struct\n");
#ifdef PNG_USER_MEM_SUPPORTED
- if ((png_ptr = (png_structp)png_create_struct_2(PNG_STRUCT_PNG,
- (png_malloc_ptr)malloc_fn)) == NULL)
+ png_ptr = (png_structp)png_create_struct_2(PNG_STRUCT_PNG,
+ (png_malloc_ptr)malloc_fn, (png_voidp)mem_ptr);
#else
- if ((png_ptr = (png_structp)png_create_struct(PNG_STRUCT_PNG)) == NULL)
+ png_ptr = (png_structp)png_create_struct(PNG_STRUCT_PNG);
#endif /* PNG_USER_MEM_SUPPORTED */
- {
- return ((png_structp)NULL);
- }
+ if (png_ptr == NULL)
+ return (NULL);
+
+#if !defined(PNG_1_0_X)
+#ifdef PNG_ASSEMBLER_CODE_SUPPORTED
+ png_init_mmx_flags(png_ptr); /* 1.2.0 addition */
+#endif
+#endif /* PNG_1_0_X */
+
+#ifdef PNG_SETJMP_SUPPORTED
#ifdef USE_FAR_KEYWORD
if (setjmp(jmpbuf))
#else
#endif
{
png_free(png_ptr, png_ptr->zbuf);
+ png_ptr->zbuf=NULL;
png_destroy_struct(png_ptr);
- return ((png_structp)NULL);
+ return (NULL);
}
#ifdef USE_FAR_KEYWORD
png_memcpy(png_ptr->jmpbuf,jmpbuf,sizeof(jmp_buf));
#endif
+#endif
+
#ifdef PNG_USER_MEM_SUPPORTED
png_set_mem_fn(png_ptr, mem_ptr, malloc_fn, free_fn);
#endif /* PNG_USER_MEM_SUPPORTED */
png_set_error_fn(png_ptr, error_ptr, error_fn, warn_fn);
- /* Libpng 0.90 and later are binary incompatible with libpng 0.89, so
- * we must recompile any applications that use any older library version.
- * For versions after libpng 1.0, we will be compatible, so we need
- * only check the first digit.
- */
- if (user_png_ver == NULL || user_png_ver[0] != png_libpng_ver[0] ||
- (png_libpng_ver[0] == '0' && user_png_ver[2] < '9'))
+ i=0;
+ do
{
- png_error(png_ptr,
- "Incompatible libpng version in application and library");
+ if(user_png_ver[i] != png_libpng_ver[i])
+ png_ptr->flags |= PNG_FLAG_LIBRARY_MISMATCH;
+ } while (png_libpng_ver[i++]);
+
+ if (png_ptr->flags & PNG_FLAG_LIBRARY_MISMATCH)
+ {
+ /* Libpng 0.90 and later are binary incompatible with libpng 0.89, so
+ * we must recompile any applications that use any older library version.
+ * For versions after libpng 1.0, we will be compatible, so we need
+ * only check the first digit.
+ */
+ if (user_png_ver == NULL || user_png_ver[0] != png_libpng_ver[0] ||
+ (user_png_ver[0] == '1' && user_png_ver[2] != png_libpng_ver[2]) ||
+ (user_png_ver[0] == '0' && user_png_ver[2] < '9'))
+ {
+#if !defined(PNG_NO_STDIO) && !defined(_WIN32_WCE)
+ char msg[80];
+ if (user_png_ver)
+ {
+ sprintf(msg, "Application was compiled with png.h from libpng-%.20s",
+ user_png_ver);
+ png_warning(png_ptr, msg);
+ }
+ sprintf(msg, "Application is running with png.c from libpng-%.20s",
+ png_libpng_ver);
+ png_warning(png_ptr, msg);
+#endif
+#ifdef PNG_ERROR_NUMBERS_SUPPORTED
+ png_ptr->flags=0;
+#endif
+ png_error(png_ptr,
+ "Incompatible libpng version in application and library");
+ }
}
/* initialize zbuf - compression buffer */
png_ptr->zbuf = (png_bytep)png_malloc(png_ptr,
(png_uint_32)png_ptr->zbuf_size);
- png_set_write_fn(png_ptr, NULL, NULL, NULL);
+ png_set_write_fn(png_ptr, png_voidp_NULL, png_rw_ptr_NULL,
+ png_flush_ptr_NULL);
#if defined(PNG_WRITE_WEIGHTED_FILTER_SUPPORTED)
png_set_filter_heuristics(png_ptr, PNG_FILTER_HEURISTIC_DEFAULT,
- 1, NULL, NULL);
+ 1, png_doublep_NULL, png_doublep_NULL);
#endif
- return ((png_structp)png_ptr);
+#ifdef PNG_SETJMP_SUPPORTED
+/* Applications that neglect to set up their own setjmp() and then encounter
+ a png_error() will longjmp here. Since the jmpbuf is then meaningless we
+ abort instead of returning. */
+#ifdef USE_FAR_KEYWORD
+ if (setjmp(jmpbuf))
+ PNG_ABORT();
+ png_memcpy(png_ptr->jmpbuf,jmpbuf,sizeof(jmp_buf));
+#else
+ if (setjmp(png_ptr->jmpbuf))
+ PNG_ABORT();
+#endif
+#endif
+ return (png_ptr);
}
/* Initialize png_ptr structure, and allocate any memory needed */
-void
+#undef png_write_init
+void PNGAPI
png_write_init(png_structp png_ptr)
{
+ /* We only come here via pre-1.0.7-compiled applications */
+ png_write_init_2(png_ptr, "1.0.6 or earlier", 0, 0);
+}
+
+void PNGAPI
+png_write_init_2(png_structp png_ptr, png_const_charp user_png_ver,
+ png_size_t png_struct_size, png_size_t png_info_size)
+{
+ /* We only come here via pre-1.0.12-compiled applications */
+#if !defined(PNG_NO_STDIO) && !defined(_WIN32_WCE)
+ if(sizeof(png_struct) > png_struct_size || sizeof(png_info) > png_info_size)
+ {
+ char msg[80];
+ png_ptr->warning_fn=NULL;
+ if (user_png_ver)
+ {
+ sprintf(msg, "Application was compiled with png.h from libpng-%.20s",
+ user_png_ver);
+ png_warning(png_ptr, msg);
+ }
+ sprintf(msg, "Application is running with png.c from libpng-%.20s",
+ png_libpng_ver);
+ png_warning(png_ptr, msg);
+ }
+#endif
+ if(sizeof(png_struct) > png_struct_size)
+ {
+ png_ptr->error_fn=NULL;
+#ifdef PNG_ERROR_NUMBERS_SUPPORTED
+ png_ptr->flags=0;
+#endif
+ png_error(png_ptr,
+ "The png struct allocated by the application for writing is too small.");
+ }
+ if(sizeof(png_info) > png_info_size)
+ {
+ png_ptr->error_fn=NULL;
+#ifdef PNG_ERROR_NUMBERS_SUPPORTED
+ png_ptr->flags=0;
+#endif
+ png_error(png_ptr,
+ "The info struct allocated by the application for writing is too small.");
+ }
+ png_write_init_3(&png_ptr, user_png_ver, png_struct_size);
+}
+
+
+void PNGAPI
+png_write_init_3(png_structpp ptr_ptr, png_const_charp user_png_ver,
+ png_size_t png_struct_size)
+{
+ png_structp png_ptr=*ptr_ptr;
+#ifdef PNG_SETJMP_SUPPORTED
jmp_buf tmp_jmp; /* to save current jump buffer */
+#endif
+ int i = 0;
+ do
+ {
+ if (user_png_ver[i] != png_libpng_ver[i])
+ {
+#ifdef PNG_LEGACY_SUPPORTED
+ png_ptr->flags |= PNG_FLAG_LIBRARY_MISMATCH;
+#else
+ png_ptr->warning_fn=NULL;
+ png_warning(png_ptr,
+ "Application uses deprecated png_write_init() and should be recompiled.");
+ break;
+#endif
+ }
+ } while (png_libpng_ver[i++]);
- png_debug(1, "in png_write_init\n");
+ png_debug(1, "in png_write_init_3\n");
+
+#ifdef PNG_SETJMP_SUPPORTED
/* save jump buffer and error functions */
png_memcpy(tmp_jmp, png_ptr->jmpbuf, sizeof (jmp_buf));
+#endif
+
+ if (sizeof(png_struct) > png_struct_size)
+ {
+ png_destroy_struct(png_ptr);
+ png_ptr = (png_structp)png_create_struct(PNG_STRUCT_PNG);
+ *ptr_ptr = png_ptr;
+ }
/* reset all variables to 0 */
png_memset(png_ptr, 0, sizeof (png_struct));
+#if !defined(PNG_1_0_X)
+#ifdef PNG_ASSEMBLER_CODE_SUPPORTED
+ png_init_mmx_flags(png_ptr); /* 1.2.0 addition */
+#endif
+#endif /* PNG_1_0_X */
+
+#ifdef PNG_SETJMP_SUPPORTED
/* restore jump buffer */
png_memcpy(png_ptr->jmpbuf, tmp_jmp, sizeof (jmp_buf));
+#endif
+
+ png_set_write_fn(png_ptr, png_voidp_NULL, png_rw_ptr_NULL,
+ png_flush_ptr_NULL);
/* initialize zbuf - compression buffer */
png_ptr->zbuf_size = PNG_ZBUF_SIZE;
png_ptr->zbuf = (png_bytep)png_malloc(png_ptr,
(png_uint_32)png_ptr->zbuf_size);
- png_set_write_fn(png_ptr, NULL, NULL, NULL);
#if defined(PNG_WRITE_WEIGHTED_FILTER_SUPPORTED)
png_set_filter_heuristics(png_ptr, PNG_FILTER_HEURISTIC_DEFAULT,
- 1, NULL, NULL);
+ 1, png_doublep_NULL, png_doublep_NULL);
#endif
}
* have called png_set_interlace_handling(), you will have to
* "write" the image seven times.
*/
-void
+void PNGAPI
png_write_rows(png_structp png_ptr, png_bytepp row,
png_uint_32 num_rows)
{
/* Write the image. You only need to call this function once, even
* if you are writing an interlaced image.
*/
-void
+void PNGAPI
png_write_image(png_structp png_ptr, png_bytepp image)
{
png_uint_32 i; /* row index */
}
/* called by user to write a row of image data */
-void
+void PNGAPI
png_write_row(png_structp png_ptr, png_bytep row)
{
png_debug2(1, "in png_write_row (row %ld, pass %d)\n",
/* initialize transformations and other stuff if first time */
if (png_ptr->row_number == 0 && png_ptr->pass == 0)
{
+ /* make sure we wrote the header info */
+ if (!(png_ptr->mode & PNG_WROTE_INFO_BEFORE_PLTE))
+ png_error(png_ptr,
+ "png_write_info was never called before png_write_row.");
+
/* check for transforms that have been set but were defined out */
#if !defined(PNG_WRITE_INVERT_SUPPORTED) && defined(PNG_READ_INVERT_SUPPORTED)
if (png_ptr->transformations & PNG_INVERT_MONO)
switch (png_ptr->pass)
{
case 0:
- if (png_ptr->row_number & 7)
+ if (png_ptr->row_number & 0x07)
{
png_write_finish_row(png_ptr);
return;
}
break;
case 1:
- if ((png_ptr->row_number & 7) || png_ptr->width < 5)
+ if ((png_ptr->row_number & 0x07) || png_ptr->width < 5)
{
png_write_finish_row(png_ptr);
return;
}
break;
case 2:
- if ((png_ptr->row_number & 7) != 4)
+ if ((png_ptr->row_number & 0x07) != 4)
{
png_write_finish_row(png_ptr);
return;
}
break;
case 3:
- if ((png_ptr->row_number & 3) || png_ptr->width < 3)
+ if ((png_ptr->row_number & 0x03) || png_ptr->width < 3)
{
png_write_finish_row(png_ptr);
return;
}
break;
case 4:
- if ((png_ptr->row_number & 3) != 2)
+ if ((png_ptr->row_number & 0x03) != 2)
{
png_write_finish_row(png_ptr);
return;
}
break;
case 5:
- if ((png_ptr->row_number & 1) || png_ptr->width < 2)
+ if ((png_ptr->row_number & 0x01) || png_ptr->width < 2)
{
png_write_finish_row(png_ptr);
return;
}
break;
case 6:
- if (!(png_ptr->row_number & 1))
+ if (!(png_ptr->row_number & 0x01))
{
png_write_finish_row(png_ptr);
return;
(png_uint_32)png_ptr->row_info.pixel_depth + 7) >> 3);
png_debug1(3, "row_info->color_type = %d\n", png_ptr->row_info.color_type);
- png_debug1(3, "row_info->width = %d\n", png_ptr->row_info.width);
+ png_debug1(3, "row_info->width = %lu\n", png_ptr->row_info.width);
png_debug1(3, "row_info->channels = %d\n", png_ptr->row_info.channels);
png_debug1(3, "row_info->bit_depth = %d\n", png_ptr->row_info.bit_depth);
png_debug1(3, "row_info->pixel_depth = %d\n", png_ptr->row_info.pixel_depth);
- png_debug1(3, "row_info->rowbytes = %d\n", png_ptr->row_info.rowbytes);
+ png_debug1(3, "row_info->rowbytes = %lu\n", png_ptr->row_info.rowbytes);
/* Copy user's row into buffer, leaving room for filter byte. */
png_memcpy_check(png_ptr, png_ptr->row_buf + 1, row,
if (png_ptr->transformations)
png_do_write_transformations(png_ptr);
+#if defined(PNG_MNG_FEATURES_SUPPORTED)
+ /* Write filter_method 64 (intrapixel differencing) only if
+ * 1. Libpng was compiled with PNG_MNG_FEATURES_SUPPORTED and
+ * 2. Libpng did not write a PNG signature (this filter_method is only
+ * used in PNG datastreams that are embedded in MNG datastreams) and
+ * 3. The application called png_permit_mng_features with a mask that
+ * included PNG_FLAG_MNG_FILTER_64 and
+ * 4. The filter_method is 64 and
+ * 5. The color_type is RGB or RGBA
+ */
+ if((png_ptr->mng_features_permitted & PNG_FLAG_MNG_FILTER_64) &&
+ (png_ptr->filter_type == PNG_INTRAPIXEL_DIFFERENCING))
+ {
+ /* Intrapixel differencing */
+ png_do_write_intrapixel(&(png_ptr->row_info), png_ptr->row_buf + 1);
+ }
+#endif
+
/* Find a filter if necessary, filter the row and write it out. */
png_write_find_filter(png_ptr, &(png_ptr->row_info));
#if defined(PNG_WRITE_FLUSH_SUPPORTED)
/* Set the automatic flush interval or 0 to turn flushing off */
-void
+void PNGAPI
png_set_flush(png_structp png_ptr, int nrows)
{
png_debug(1, "in png_set_flush\n");
}
/* flush the current output buffers now */
-void
+void PNGAPI
png_write_flush(png_structp png_ptr)
{
int wrote_IDAT;
#endif /* PNG_WRITE_FLUSH_SUPPORTED */
/* free all memory used by the write */
-void
+void PNGAPI
png_destroy_write_struct(png_structpp png_ptr_ptr, png_infopp info_ptr_ptr)
{
png_structp png_ptr = NULL;
png_infop info_ptr = NULL;
#ifdef PNG_USER_MEM_SUPPORTED
png_free_ptr free_fn = NULL;
+ png_voidp mem_ptr = NULL;
#endif
png_debug(1, "in png_destroy_write_struct\n");
png_ptr = *png_ptr_ptr;
#ifdef PNG_USER_MEM_SUPPORTED
free_fn = png_ptr->free_fn;
+ mem_ptr = png_ptr->mem_ptr;
#endif
}
if (info_ptr != NULL)
{
-#ifdef PNG_WRITE_tEXt_SUPPORTED
- png_free(png_ptr, info_ptr->text);
-#endif
-#if defined(PNG_READ_pCAL_SUPPORTED)
- png_free(png_ptr, info_ptr->pcal_purpose);
- png_free(png_ptr, info_ptr->pcal_units);
- if (info_ptr->pcal_params != NULL)
+ png_free_data(png_ptr, info_ptr, PNG_FREE_ALL, -1);
+
+#if defined(PNG_UNKNOWN_CHUNKS_SUPPORTED)
+ if (png_ptr->num_chunk_list)
{
- int i;
- for (i = 0; i < (int)info_ptr->pcal_nparams; i++)
- {
- png_free(png_ptr, info_ptr->pcal_params[i]);
- }
- png_free(png_ptr, info_ptr->pcal_params);
+ png_free(png_ptr, png_ptr->chunk_list);
+ png_ptr->chunk_list=NULL;
+ png_ptr->num_chunk_list=0;
}
#endif
+
#ifdef PNG_USER_MEM_SUPPORTED
- png_destroy_struct_2((png_voidp)info_ptr, free_fn);
+ png_destroy_struct_2((png_voidp)info_ptr, (png_free_ptr)free_fn,
+ (png_voidp)mem_ptr);
#else
png_destroy_struct((png_voidp)info_ptr);
#endif
- *info_ptr_ptr = (png_infop)NULL;
+ *info_ptr_ptr = NULL;
}
if (png_ptr != NULL)
{
png_write_destroy(png_ptr);
#ifdef PNG_USER_MEM_SUPPORTED
- png_destroy_struct_2((png_voidp)png_ptr, free_fn);
+ png_destroy_struct_2((png_voidp)png_ptr, (png_free_ptr)free_fn,
+ (png_voidp)mem_ptr);
#else
png_destroy_struct((png_voidp)png_ptr);
#endif
- *png_ptr_ptr = (png_structp)NULL;
+ *png_ptr_ptr = NULL;
}
}
/* Free any memory used in png_ptr struct (old method) */
-void
+void /* PRIVATE */
png_write_destroy(png_structp png_ptr)
{
+#ifdef PNG_SETJMP_SUPPORTED
jmp_buf tmp_jmp; /* save jump buffer */
+#endif
png_error_ptr error_fn;
png_error_ptr warning_fn;
png_voidp error_ptr;
png_free(png_ptr, png_ptr->up_row);
png_free(png_ptr, png_ptr->avg_row);
png_free(png_ptr, png_ptr->paeth_row);
+
#if defined(PNG_TIME_RFC1123_SUPPORTED)
png_free(png_ptr, png_ptr->time_buffer);
-#endif /* PNG_TIME_RFC1123_SUPPORTED */
+#endif
+
#if defined(PNG_WRITE_WEIGHTED_FILTER_SUPPORTED)
png_free(png_ptr, png_ptr->prev_filters);
png_free(png_ptr, png_ptr->filter_weights);
png_free(png_ptr, png_ptr->inv_filter_weights);
png_free(png_ptr, png_ptr->filter_costs);
png_free(png_ptr, png_ptr->inv_filter_costs);
-#endif /* PNG_WRITE_WEIGHTED_FILTER_SUPPORTED */
+#endif
+#ifdef PNG_SETJMP_SUPPORTED
/* reset structure */
png_memcpy(tmp_jmp, png_ptr->jmpbuf, sizeof (jmp_buf));
+#endif
error_fn = png_ptr->error_fn;
warning_fn = png_ptr->warning_fn;
png_ptr->free_fn = free_fn;
#endif
+#ifdef PNG_SETJMP_SUPPORTED
png_memcpy(png_ptr->jmpbuf, tmp_jmp, sizeof (jmp_buf));
+#endif
}
/* Allow the application to select one or more row filters to use. */
-void
+void PNGAPI
png_set_filter(png_structp png_ptr, int method, int filters)
{
png_debug(1, "in png_set_filter\n");
- /* We allow 'method' only for future expansion of the base filter method. */
+#if defined(PNG_MNG_FEATURES_SUPPORTED)
+ if((png_ptr->mng_features_permitted & PNG_FLAG_MNG_FILTER_64) &&
+ (method == PNG_INTRAPIXEL_DIFFERENCING))
+ method = PNG_FILTER_TYPE_BASE;
+#endif
if (method == PNG_FILTER_TYPE_BASE)
{
switch (filters & (PNG_ALL_FILTERS | 0x07))
*/
if (png_ptr->row_buf != NULL)
{
- if (png_ptr->do_filter & PNG_FILTER_SUB && png_ptr->sub_row == NULL)
+ if ((png_ptr->do_filter & PNG_FILTER_SUB) && png_ptr->sub_row == NULL)
{
png_ptr->sub_row = (png_bytep)png_malloc(png_ptr,
(png_ptr->rowbytes + 1));
png_ptr->sub_row[0] = PNG_FILTER_VALUE_SUB;
}
- if (png_ptr->do_filter & PNG_FILTER_UP && png_ptr->up_row == NULL)
+ if ((png_ptr->do_filter & PNG_FILTER_UP) && png_ptr->up_row == NULL)
{
if (png_ptr->prev_row == NULL)
{
}
}
- if (png_ptr->do_filter & PNG_FILTER_AVG && png_ptr->avg_row == NULL)
+ if ((png_ptr->do_filter & PNG_FILTER_AVG) && png_ptr->avg_row == NULL)
{
if (png_ptr->prev_row == NULL)
{
}
}
- if (png_ptr->do_filter & PNG_FILTER_PAETH &&
+ if ((png_ptr->do_filter & PNG_FILTER_PAETH) &&
png_ptr->paeth_row == NULL)
{
if (png_ptr->prev_row == NULL)
{
png_warning(png_ptr, "Can't add Paeth filter after starting");
- png_ptr->do_filter &= ~PNG_FILTER_PAETH;
+ png_ptr->do_filter &= (png_byte)(~PNG_FILTER_PAETH);
}
else
{
* better compression.
*/
#if defined(PNG_WRITE_WEIGHTED_FILTER_SUPPORTED) /* GRR 970116 */
-void
+void PNGAPI
png_set_filter_heuristics(png_structp png_ptr, int heuristic_method,
int num_weights, png_doublep filter_weights,
png_doublep filter_costs)
num_weights = 0;
}
- png_ptr->num_prev_filters = num_weights;
- png_ptr->heuristic_method = heuristic_method;
+ png_ptr->num_prev_filters = (png_byte)num_weights;
+ png_ptr->heuristic_method = (png_byte)heuristic_method;
if (num_weights > 0)
{
if (png_ptr->filter_weights == NULL)
{
- png_ptr->filter_weights = (png_uint_16p) png_malloc(png_ptr,
+ png_ptr->filter_weights = (png_uint_16p)png_malloc(png_ptr,
(png_uint_32)(sizeof(png_uint_16) * num_weights));
- png_ptr->inv_filter_weights = (png_uint_16p) png_malloc(png_ptr,
+ png_ptr->inv_filter_weights = (png_uint_16p)png_malloc(png_ptr,
(png_uint_32)(sizeof(png_uint_16) * num_weights));
-
for (i = 0; i < num_weights; i++)
{
png_ptr->inv_filter_weights[i] =
*/
if (png_ptr->filter_costs == NULL)
{
- png_ptr->filter_costs = (png_uint_16p) png_malloc(png_ptr,
+ png_ptr->filter_costs = (png_uint_16p)png_malloc(png_ptr,
(png_uint_32)(sizeof(png_uint_16) * PNG_FILTER_VALUE_LAST));
- png_ptr->inv_filter_costs = (png_uint_16p) png_malloc(png_ptr,
+ png_ptr->inv_filter_costs = (png_uint_16p)png_malloc(png_ptr,
(png_uint_32)(sizeof(png_uint_16) * PNG_FILTER_VALUE_LAST));
for (i = 0; i < PNG_FILTER_VALUE_LAST; i++)
}
#endif /* PNG_WRITE_WEIGHTED_FILTER_SUPPORTED */
-void
+void PNGAPI
png_set_compression_level(png_structp png_ptr, int level)
{
png_debug(1, "in png_set_compression_level\n");
png_ptr->zlib_level = level;
}
-void
+void PNGAPI
png_set_compression_mem_level(png_structp png_ptr, int mem_level)
{
png_debug(1, "in png_set_compression_mem_level\n");
png_ptr->zlib_mem_level = mem_level;
}
-void
+void PNGAPI
png_set_compression_strategy(png_structp png_ptr, int strategy)
{
png_debug(1, "in png_set_compression_strategy\n");
png_ptr->zlib_strategy = strategy;
}
-void
+void PNGAPI
png_set_compression_window_bits(png_structp png_ptr, int window_bits)
{
if (window_bits > 15)
png_warning(png_ptr, "Only compression windows <= 32k supported by PNG");
+ else if (window_bits < 8)
+ png_warning(png_ptr, "Only compression windows >= 256 supported by PNG");
+#ifndef WBITS_8_OK
+ /* avoid libpng bug with 256-byte windows */
+ if (window_bits == 8)
+ {
+ png_warning(png_ptr, "Compression window is being reset to 512");
+ window_bits=9;
+ }
+#endif
png_ptr->flags |= PNG_FLAG_ZLIB_CUSTOM_WINDOW_BITS;
png_ptr->zlib_window_bits = window_bits;
}
-void
+void PNGAPI
png_set_compression_method(png_structp png_ptr, int method)
{
png_debug(1, "in png_set_compression_method\n");
png_ptr->zlib_method = method;
}
-void
+void PNGAPI
png_set_write_status_fn(png_structp png_ptr, png_write_status_ptr write_row_fn)
{
png_ptr->write_row_fn = write_row_fn;
}
#if defined(PNG_WRITE_USER_TRANSFORM_SUPPORTED)
-void
+void PNGAPI
png_set_write_user_transform_fn(png_structp png_ptr, png_user_transform_ptr
write_user_transform_fn)
{
}
#endif
+
+#if defined(PNG_INFO_IMAGE_SUPPORTED)
+void PNGAPI
+png_write_png(png_structp png_ptr, png_infop info_ptr,
+ int transforms, voidp params)
+{
+#if defined(PNG_WRITE_INVERT_ALPHA_SUPPORTED)
+ /* invert the alpha channel from opacity to transparency */
+ if (transforms & PNG_TRANSFORM_INVERT_ALPHA)
+ png_set_invert_alpha(png_ptr);
+#endif
+
+ /* Write the file header information. */
+ png_write_info(png_ptr, info_ptr);
+
+ /* ------ these transformations don't touch the info structure ------- */
+
+#if defined(PNG_WRITE_INVERT_SUPPORTED)
+ /* invert monochrome pixels */
+ if (transforms & PNG_TRANSFORM_INVERT_MONO)
+ png_set_invert_mono(png_ptr);
+#endif
+
+#if defined(PNG_WRITE_SHIFT_SUPPORTED)
+ /* Shift the pixels up to a legal bit depth and fill in
+ * as appropriate to correctly scale the image.
+ */
+ if ((transforms & PNG_TRANSFORM_SHIFT)
+ && (info_ptr->valid & PNG_INFO_sBIT))
+ png_set_shift(png_ptr, &info_ptr->sig_bit);
+#endif
+
+#if defined(PNG_WRITE_PACK_SUPPORTED)
+ /* pack pixels into bytes */
+ if (transforms & PNG_TRANSFORM_PACKING)
+ png_set_packing(png_ptr);
+#endif
+
+#if defined(PNG_WRITE_SWAP_ALPHA_SUPPORTED)
+ /* swap location of alpha bytes from ARGB to RGBA */
+ if (transforms & PNG_TRANSFORM_SWAP_ALPHA)
+ png_set_swap_alpha(png_ptr);
+#endif
+
+#if defined(PNG_WRITE_FILLER_SUPPORTED)
+ /* Get rid of filler (OR ALPHA) bytes, pack XRGB/RGBX/ARGB/RGBA into
+ * RGB (4 channels -> 3 channels). The second parameter is not used.
+ */
+ if (transforms & PNG_TRANSFORM_STRIP_FILLER)
+ png_set_filler(png_ptr, 0, PNG_FILLER_BEFORE);
+#endif
+
+#if defined(PNG_WRITE_BGR_SUPPORTED)
+ /* flip BGR pixels to RGB */
+ if (transforms & PNG_TRANSFORM_BGR)
+ png_set_bgr(png_ptr);
+#endif
+
+#if defined(PNG_WRITE_SWAP_SUPPORTED)
+ /* swap bytes of 16-bit files to most significant byte first */
+ if (transforms & PNG_TRANSFORM_SWAP_ENDIAN)
+ png_set_swap(png_ptr);
+#endif
+
+#if defined(PNG_WRITE_PACKSWAP_SUPPORTED)
+ /* swap bits of 1, 2, 4 bit packed pixel formats */
+ if (transforms & PNG_TRANSFORM_PACKSWAP)
+ png_set_packswap(png_ptr);
+#endif
+
+ /* ----------------------- end of transformations ------------------- */
+
+ /* write the bits */
+ if (info_ptr->valid & PNG_INFO_IDAT)
+ png_write_image(png_ptr, info_ptr->row_pointers);
+
+ /* It is REQUIRED to call this to finish writing the rest of the file */
+ png_write_end(png_ptr, info_ptr);
+
+ if(transforms == 0 || params == NULL)
+ /* quiet compiler warnings */ return;
+}
+#endif
+#endif /* PNG_WRITE_SUPPORTED */
/* pngwtran.c - transforms the data in a row for PNG writers
*
- * libpng 1.0.3 - January 14, 1999
+ * libpng 1.2.4 - July 8, 2002
* For conditions of distribution and use, see copyright notice in png.h
- * Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.
- * Copyright (c) 1996, 1997 Andreas Dilger
- * Copyright (c) 1998, 1999 Glenn Randers-Pehrson
+ * Copyright (c) 1998-2002 Glenn Randers-Pehrson
+ * (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger)
+ * (Version 0.88 Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.)
*/
#define PNG_INTERNAL
#include "png.h"
+#ifdef PNG_WRITE_SUPPORTED
/* Transform the data according to the user's wishes. The order of
* transformations is significant.
*/
-void
+void /* PRIVATE */
png_do_write_transformations(png_structp png_ptr)
{
png_debug(1, "in png_do_write_transformations\n");
+ if (png_ptr == NULL)
+ return;
+
#if defined(PNG_WRITE_USER_TRANSFORM_SUPPORTED)
if (png_ptr->transformations & PNG_USER_TRANSFORM)
if(png_ptr->write_user_transform_fn != NULL)
* row_info bit depth should be 8 (one pixel per byte). The channels
* should be 1 (this only happens on grayscale and paletted images).
*/
-void
+void /* PRIVATE */
png_do_pack(png_row_infop row_info, png_bytep row, png_uint_32 bit_depth)
{
png_debug(1, "in png_do_pack\n");
{
png_byte value;
- value = (png_byte)(*sp & 0x3);
+ value = (png_byte)(*sp & 0x03);
v |= (value << shift);
if (shift == 0)
{
{
png_byte value;
- value = (png_byte)(*sp & 0xf);
+ value = (png_byte)(*sp & 0x0f);
v |= (value << shift);
if (shift == 0)
* would pass 3 as bit_depth, and this routine would translate the
* data to 0 to 15.
*/
-void
+void /* PRIVATE */
png_do_shift(png_row_infop row_info, png_bytep row, png_color_8p bit_depth)
{
png_debug(1, "in png_do_shift\n");
png_uint_16 value, v;
int j;
- v = ((png_uint_16)(*bp) << 8) + *(bp + 1);
+ v = (png_uint_16)(((png_uint_16)(*bp) << 8) + *(bp + 1));
value = 0;
for (j = shift_start[c]; j > -shift_dec[c]; j -= shift_dec[c])
{
#endif
#if defined(PNG_WRITE_SWAP_ALPHA_SUPPORTED)
-void
+void /* PRIVATE */
png_do_write_swap_alpha(png_row_infop row_info, png_bytep row)
{
png_debug(1, "in png_do_write_swap_alpha\n");
#endif
#if defined(PNG_WRITE_INVERT_ALPHA_SUPPORTED)
-void
+void /* PRIVATE */
png_do_write_invert_alpha(png_row_infop row_info, png_bytep row)
{
png_debug(1, "in png_do_write_invert_alpha\n");
*(dp++) = *(sp++);
*(dp++) = *(sp++);
*(dp++) = *(sp++);
- *(dp++) = 255 - *(sp++);
+ *(dp++) = (png_byte)(255 - *(sp++));
}
}
/* This inverts the alpha channel in RRGGBBAA */
*(dp++) = *(sp++);
*(dp++) = *(sp++);
*(dp++) = *(sp++);
- *(dp++) = 255 - *(sp++);
- *(dp++) = 255 - *(sp++);
+ *(dp++) = (png_byte)(255 - *(sp++));
+ *(dp++) = (png_byte)(255 - *(sp++));
}
}
}
for (i = 0, sp = dp = row; i < row_width; i++)
{
*(dp++) = *(sp++);
- *(dp++) = 255 - *(sp++);
+ *(dp++) = (png_byte)(255 - *(sp++));
}
}
/* This inverts the alpha channel in GGAA */
{
*(dp++) = *(sp++);
*(dp++) = *(sp++);
- *(dp++) = 255 - *(sp++);
- *(dp++) = 255 - *(sp++);
+ *(dp++) = (png_byte)(255 - *(sp++));
+ *(dp++) = (png_byte)(255 - *(sp++));
}
}
}
}
}
#endif
+
+#if defined(PNG_MNG_FEATURES_SUPPORTED)
+/* undoes intrapixel differencing */
+void /* PRIVATE */
+png_do_write_intrapixel(png_row_infop row_info, png_bytep row)
+{
+ png_debug(1, "in png_do_write_intrapixel\n");
+ if (
+#if defined(PNG_USELESS_TESTS_SUPPORTED)
+ row != NULL && row_info != NULL &&
+#endif
+ (row_info->color_type & PNG_COLOR_MASK_COLOR))
+ {
+ int bytes_per_pixel;
+ png_uint_32 row_width = row_info->width;
+ if (row_info->bit_depth == 8)
+ {
+ png_bytep rp;
+ png_uint_32 i;
+
+ if (row_info->color_type == PNG_COLOR_TYPE_RGB)
+ bytes_per_pixel = 3;
+ else if (row_info->color_type == PNG_COLOR_TYPE_RGB_ALPHA)
+ bytes_per_pixel = 4;
+ else
+ return;
+
+ for (i = 0, rp = row; i < row_width; i++, rp += bytes_per_pixel)
+ {
+ *(rp) = (png_byte)((*rp - *(rp+1))&0xff);
+ *(rp+2) = (png_byte)((*(rp+2) - *(rp+1))&0xff);
+ }
+ }
+ else if (row_info->bit_depth == 16)
+ {
+ png_bytep rp;
+ png_uint_32 i;
+
+ if (row_info->color_type == PNG_COLOR_TYPE_RGB)
+ bytes_per_pixel = 6;
+ else if (row_info->color_type == PNG_COLOR_TYPE_RGB_ALPHA)
+ bytes_per_pixel = 8;
+ else
+ return;
+
+ for (i = 0, rp = row; i < row_width; i++, rp += bytes_per_pixel)
+ {
+ png_uint_32 s0=*(rp )<<8 | *(rp+1);
+ png_uint_32 s1=*(rp+2)<<8 | *(rp+3);
+ png_uint_32 s2=*(rp+4)<<8 | *(rp+5);
+ png_uint_32 red=(s0-s1)&0xffff;
+ png_uint_32 blue=(s2-s1)&0xffff;
+ *(rp ) = (png_byte)((red>>8)&0xff);
+ *(rp+1) = (png_byte)(red&0xff);
+ *(rp+4) = (png_byte)((blue>>8)&0xff);
+ *(rp+5) = (png_byte)(blue&0xff);
+ }
+ }
+ }
+}
+#endif /* PNG_MNG_FEATURES_SUPPORTED */
+#endif /* PNG_WRITE_SUPPORTED */
/* pngwutil.c - utilities to write a PNG file
*
- * libpng 1.0.3 - January 14, 1999
+ * libpng 1.2.4 - July 8, 2002
* For conditions of distribution and use, see copyright notice in png.h
- * Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.
- * Copyright (c) 1996, 1997 Andreas Dilger
- * Copyright (c) 1998, 1999 Glenn Randers-Pehrson
+ * Copyright (c) 1998-2002 Glenn Randers-Pehrson
+ * (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger)
+ * (Version 0.88 Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.)
*/
#define PNG_INTERNAL
#include "png.h"
+#ifdef PNG_WRITE_SUPPORTED
/* Place a 32-bit number into a buffer in PNG byte order. We work
* with unsigned numbers for convenience, although one supported
* ancillary chunk uses signed (two's complement) numbers.
*/
-void
+void /* PRIVATE */
png_save_uint_32(png_bytep buf, png_uint_32 i)
{
buf[0] = (png_byte)((i >> 24) & 0xff);
buf[3] = (png_byte)(i & 0xff);
}
-#if defined(PNG_WRITE_pCAL_SUPPORTED)
+#if defined(PNG_WRITE_pCAL_SUPPORTED) || defined(PNG_WRITE_oFFs_SUPPORTED)
/* The png_save_int_32 function assumes integers are stored in two's
* complement format. If this isn't the case, then this routine needs to
* be modified to write data in two's complement format.
*/
-void
+void /* PRIVATE */
png_save_int_32(png_bytep buf, png_int_32 i)
{
buf[0] = (png_byte)((i >> 24) & 0xff);
* The parameter is declared unsigned int, not png_uint_16,
* just to avoid potential problems on pre-ANSI C compilers.
*/
-void
+void /* PRIVATE */
png_save_uint_16(png_bytep buf, unsigned int i)
{
buf[0] = (png_byte)((i >> 8) & 0xff);
* png_write_chunk_start(), png_write_chunk_data(), and png_write_chunk_end()
* functions instead.
*/
-void
+void PNGAPI
png_write_chunk(png_structp png_ptr, png_bytep chunk_name,
png_bytep data, png_size_t length)
{
* The total_length is the sum of the lengths of all the data you will be
* passing in png_write_chunk_data().
*/
-void
+void PNGAPI
png_write_chunk_start(png_structp png_ptr, png_bytep chunk_name,
png_uint_32 length)
{
png_byte buf[4];
- png_debug2(0, "Writing %s chunk (%d bytes)\n", chunk_name, length);
+ png_debug2(0, "Writing %s chunk (%lu bytes)\n", chunk_name, length);
/* write the length */
png_save_uint_32(buf, length);
* sum of the lengths from these calls *must* add up to the total_length
* given to png_write_chunk_start().
*/
-void
+void PNGAPI
png_write_chunk_data(png_structp png_ptr, png_bytep data, png_size_t length)
{
/* write the data, and run the CRC over it */
}
/* Finish a chunk started with png_write_chunk_start(). */
-void
+void PNGAPI
png_write_chunk_end(png_structp png_ptr)
{
png_byte buf[4];
* we should call png_set_sig_bytes() to tell libpng how many of the
* bytes have already been written.
*/
-void
+void /* PRIVATE */
png_write_sig(png_structp png_ptr)
{
+ png_byte png_signature[8] = {137, 80, 78, 71, 13, 10, 26, 10};
/* write the rest of the 8 byte signature */
- png_write_data(png_ptr, &png_sig[png_ptr->sig_bytes],
+ png_write_data(png_ptr, &png_signature[png_ptr->sig_bytes],
(png_size_t)8 - png_ptr->sig_bytes);
+ if(png_ptr->sig_bytes < 3)
+ png_ptr->mode |= PNG_HAVE_PNG_SIGNATURE;
+}
+
+#if defined(PNG_WRITE_TEXT_SUPPORTED) || defined(PNG_WRITE_iCCP_SUPPORTED)
+/*
+ * This pair of functions encapsulates the operation of (a) compressing a
+ * text string, and (b) issuing it later as a series of chunk data writes.
+ * The compression_state structure is shared context for these functions
+ * set up by the caller in order to make the whole mess thread-safe.
+ */
+
+typedef struct
+{
+ char *input; /* the uncompressed input data */
+ int input_len; /* its length */
+ int num_output_ptr; /* number of output pointers used */
+ int max_output_ptr; /* size of output_ptr */
+ png_charpp output_ptr; /* array of pointers to output */
+} compression_state;
+
+/* compress given text into storage in the png_ptr structure */
+static int /* PRIVATE */
+png_text_compress(png_structp png_ptr,
+ png_charp text, png_size_t text_len, int compression,
+ compression_state *comp)
+{
+ int ret;
+
+ comp->num_output_ptr = comp->max_output_ptr = 0;
+ comp->output_ptr = NULL;
+ comp->input = NULL;
+
+ /* we may just want to pass the text right through */
+ if (compression == PNG_TEXT_COMPRESSION_NONE)
+ {
+ comp->input = text;
+ comp->input_len = text_len;
+ return((int)text_len);
+ }
+
+ if (compression >= PNG_TEXT_COMPRESSION_LAST)
+ {
+#if !defined(PNG_NO_STDIO) && !defined(_WIN32_WCE)
+ char msg[50];
+ sprintf(msg, "Unknown compression type %d", compression);
+ png_warning(png_ptr, msg);
+#else
+ png_warning(png_ptr, "Unknown compression type");
+#endif
+ }
+
+ /* We can't write the chunk until we find out how much data we have,
+ * which means we need to run the compressor first and save the
+ * output. This shouldn't be a problem, as the vast majority of
+ * comments should be reasonable, but we will set up an array of
+ * malloc'd pointers to be sure.
+ *
+ * If we knew the application was well behaved, we could simplify this
+ * greatly by assuming we can always malloc an output buffer large
+ * enough to hold the compressed text ((1001 * text_len / 1000) + 12)
+ * and malloc this directly. The only time this would be a bad idea is
+ * if we can't malloc more than 64K and we have 64K of random input
+ * data, or if the input string is incredibly large (although this
+ * wouldn't cause a failure, just a slowdown due to swapping).
+ */
+
+ /* set up the compression buffers */
+ png_ptr->zstream.avail_in = (uInt)text_len;
+ png_ptr->zstream.next_in = (Bytef *)text;
+ png_ptr->zstream.avail_out = (uInt)png_ptr->zbuf_size;
+ png_ptr->zstream.next_out = (Bytef *)png_ptr->zbuf;
+
+ /* this is the same compression loop as in png_write_row() */
+ do
+ {
+ /* compress the data */
+ ret = deflate(&png_ptr->zstream, Z_NO_FLUSH);
+ if (ret != Z_OK)
+ {
+ /* error */
+ if (png_ptr->zstream.msg != NULL)
+ png_error(png_ptr, png_ptr->zstream.msg);
+ else
+ png_error(png_ptr, "zlib error");
+ }
+ /* check to see if we need more room */
+ if (!png_ptr->zstream.avail_out && png_ptr->zstream.avail_in)
+ {
+ /* make sure the output array has room */
+ if (comp->num_output_ptr >= comp->max_output_ptr)
+ {
+ int old_max;
+
+ old_max = comp->max_output_ptr;
+ comp->max_output_ptr = comp->num_output_ptr + 4;
+ if (comp->output_ptr != NULL)
+ {
+ png_charpp old_ptr;
+
+ old_ptr = comp->output_ptr;
+ comp->output_ptr = (png_charpp)png_malloc(png_ptr,
+ (png_uint_32)(comp->max_output_ptr * sizeof (png_charpp)));
+ png_memcpy(comp->output_ptr, old_ptr, old_max
+ * sizeof (png_charp));
+ png_free(png_ptr, old_ptr);
+ }
+ else
+ comp->output_ptr = (png_charpp)png_malloc(png_ptr,
+ (png_uint_32)(comp->max_output_ptr * sizeof (png_charp)));
+ }
+
+ /* save the data */
+ comp->output_ptr[comp->num_output_ptr] = (png_charp)png_malloc(png_ptr,
+ (png_uint_32)png_ptr->zbuf_size);
+ png_memcpy(comp->output_ptr[comp->num_output_ptr], png_ptr->zbuf,
+ png_ptr->zbuf_size);
+ comp->num_output_ptr++;
+
+ /* and reset the buffer */
+ png_ptr->zstream.avail_out = (uInt)png_ptr->zbuf_size;
+ png_ptr->zstream.next_out = png_ptr->zbuf;
+ }
+ /* continue until we don't have any more to compress */
+ } while (png_ptr->zstream.avail_in);
+
+ /* finish the compression */
+ do
+ {
+ /* tell zlib we are finished */
+ ret = deflate(&png_ptr->zstream, Z_FINISH);
+
+ if (ret == Z_OK)
+ {
+ /* check to see if we need more room */
+ if (!(png_ptr->zstream.avail_out))
+ {
+ /* check to make sure our output array has room */
+ if (comp->num_output_ptr >= comp->max_output_ptr)
+ {
+ int old_max;
+
+ old_max = comp->max_output_ptr;
+ comp->max_output_ptr = comp->num_output_ptr + 4;
+ if (comp->output_ptr != NULL)
+ {
+ png_charpp old_ptr;
+
+ old_ptr = comp->output_ptr;
+ /* This could be optimized to realloc() */
+ comp->output_ptr = (png_charpp)png_malloc(png_ptr,
+ (png_uint_32)(comp->max_output_ptr * sizeof (png_charpp)));
+ png_memcpy(comp->output_ptr, old_ptr,
+ old_max * sizeof (png_charp));
+ png_free(png_ptr, old_ptr);
+ }
+ else
+ comp->output_ptr = (png_charpp)png_malloc(png_ptr,
+ (png_uint_32)(comp->max_output_ptr * sizeof (png_charp)));
+ }
+
+ /* save off the data */
+ comp->output_ptr[comp->num_output_ptr] =
+ (png_charp)png_malloc(png_ptr, (png_uint_32)png_ptr->zbuf_size);
+ png_memcpy(comp->output_ptr[comp->num_output_ptr], png_ptr->zbuf,
+ png_ptr->zbuf_size);
+ comp->num_output_ptr++;
+
+ /* and reset the buffer pointers */
+ png_ptr->zstream.avail_out = (uInt)png_ptr->zbuf_size;
+ png_ptr->zstream.next_out = png_ptr->zbuf;
+ }
+ }
+ else if (ret != Z_STREAM_END)
+ {
+ /* we got an error */
+ if (png_ptr->zstream.msg != NULL)
+ png_error(png_ptr, png_ptr->zstream.msg);
+ else
+ png_error(png_ptr, "zlib error");
+ }
+ } while (ret != Z_STREAM_END);
+
+ /* text length is number of buffers plus last buffer */
+ text_len = png_ptr->zbuf_size * comp->num_output_ptr;
+ if (png_ptr->zstream.avail_out < png_ptr->zbuf_size)
+ text_len += png_ptr->zbuf_size - (png_size_t)png_ptr->zstream.avail_out;
+
+ return((int)text_len);
+}
+
+/* ship the compressed text out via chunk writes */
+static void /* PRIVATE */
+png_write_compressed_data_out(png_structp png_ptr, compression_state *comp)
+{
+ int i;
+
+ /* handle the no-compression case */
+ if (comp->input)
+ {
+ png_write_chunk_data(png_ptr, (png_bytep)comp->input,
+ (png_size_t)comp->input_len);
+ return;
+ }
+
+ /* write saved output buffers, if any */
+ for (i = 0; i < comp->num_output_ptr; i++)
+ {
+ png_write_chunk_data(png_ptr,(png_bytep)comp->output_ptr[i],
+ png_ptr->zbuf_size);
+ png_free(png_ptr, comp->output_ptr[i]);
+ comp->output_ptr[i]=NULL;
+ }
+ if (comp->max_output_ptr != 0)
+ png_free(png_ptr, comp->output_ptr);
+ comp->output_ptr=NULL;
+ /* write anything left in zbuf */
+ if (png_ptr->zstream.avail_out < (png_uint_32)png_ptr->zbuf_size)
+ png_write_chunk_data(png_ptr, png_ptr->zbuf,
+ png_ptr->zbuf_size - png_ptr->zstream.avail_out);
+
+ /* reset zlib for another zTXt/iTXt or the image data */
+ deflateReset(&png_ptr->zstream);
+
}
+#endif
/* Write the IHDR chunk, and update the png_struct with the necessary
* information. Note that the rest of this code depends upon this
* information being correct.
*/
-void
+void /* PRIVATE */
png_write_IHDR(png_structp png_ptr, png_uint_32 width, png_uint_32 height,
int bit_depth, int color_type, int compression_type, int filter_type,
int interlace_type)
{
+#ifdef PNG_USE_LOCAL_ARRAYS
+ PNG_IHDR;
+#endif
png_byte buf[13]; /* buffer to store the IHDR info */
png_debug(1, "in png_write_IHDR\n");
compression_type = PNG_COMPRESSION_TYPE_BASE;
}
- if (filter_type != PNG_FILTER_TYPE_BASE)
+ /* Write filter_method 64 (intrapixel differencing) only if
+ * 1. Libpng was compiled with PNG_MNG_FEATURES_SUPPORTED and
+ * 2. Libpng did not write a PNG signature (this filter_method is only
+ * used in PNG datastreams that are embedded in MNG datastreams) and
+ * 3. The application called png_permit_mng_features with a mask that
+ * included PNG_FLAG_MNG_FILTER_64 and
+ * 4. The filter_method is 64 and
+ * 5. The color_type is RGB or RGBA
+ */
+ if (
+#if defined(PNG_MNG_FEATURES_SUPPORTED)
+ !((png_ptr->mng_features_permitted & PNG_FLAG_MNG_FILTER_64) &&
+ ((png_ptr->mode&PNG_HAVE_PNG_SIGNATURE) == 0) &&
+ (color_type == PNG_COLOR_TYPE_RGB ||
+ color_type == PNG_COLOR_TYPE_RGB_ALPHA) &&
+ (filter_type == PNG_INTRAPIXEL_DIFFERENCING)) &&
+#endif
+ filter_type != PNG_FILTER_TYPE_BASE)
{
png_warning(png_ptr, "Invalid filter type specified");
filter_type = PNG_FILTER_TYPE_BASE;
png_ptr->bit_depth = (png_byte)bit_depth;
png_ptr->color_type = (png_byte)color_type;
png_ptr->interlaced = (png_byte)interlace_type;
+#if defined(PNG_MNG_FEATURES_SUPPORTED)
+ png_ptr->filter_type = (png_byte)filter_type;
+#endif
png_ptr->width = width;
png_ptr->height = height;
buf[12] = (png_byte)interlace_type;
/* write the chunk */
- png_write_chunk(png_ptr, png_IHDR, buf, (png_size_t)13);
+ png_write_chunk(png_ptr, (png_bytep)png_IHDR, buf, (png_size_t)13);
/* initialize zlib with PNG info */
png_ptr->zstream.zalloc = png_zalloc;
* correct order for PNG, so people can redefine it to any convenient
* structure.
*/
-void
+void /* PRIVATE */
png_write_PLTE(png_structp png_ptr, png_colorp palette, png_uint_32 num_pal)
{
+#ifdef PNG_USE_LOCAL_ARRAYS
+ PNG_PLTE;
+#endif
png_uint_32 i;
png_colorp pal_ptr;
png_byte buf[3];
png_debug(1, "in png_write_PLTE\n");
- if (num_pal == 0 || num_pal > 256)
+ if ((
+#if defined(PNG_MNG_FEATURES_SUPPORTED)
+ !(png_ptr->mng_features_permitted & PNG_FLAG_MNG_EMPTY_PLTE) &&
+#endif
+ num_pal == 0) || num_pal > 256)
{
- if (png_ptr->color_type == PNG_COLOR_TYPE_PALETTE)
- {
- png_error(png_ptr, "Invalid number of colors in palette");
- }
- else
- {
- png_warning(png_ptr, "Invalid number of colors in palette");
- return;
- }
+ if (png_ptr->color_type == PNG_COLOR_TYPE_PALETTE)
+ {
+ png_error(png_ptr, "Invalid number of colors in palette");
+ }
+ else
+ {
+ png_warning(png_ptr, "Invalid number of colors in palette");
+ return;
+ }
+ }
+
+ if (!(png_ptr->color_type&PNG_COLOR_MASK_COLOR))
+ {
+ png_warning(png_ptr,
+ "Ignoring request to write a PLTE chunk in grayscale PNG");
+ return;
}
png_ptr->num_palette = (png_uint_16)num_pal;
png_debug1(3, "num_palette = %d\n", png_ptr->num_palette);
- png_write_chunk_start(png_ptr, png_PLTE, num_pal * 3);
+ png_write_chunk_start(png_ptr, (png_bytep)png_PLTE, num_pal * 3);
+#ifndef PNG_NO_POINTER_INDEXING
for (i = 0, pal_ptr = palette; i < num_pal; i++, pal_ptr++)
{
buf[0] = pal_ptr->red;
buf[2] = pal_ptr->blue;
png_write_chunk_data(png_ptr, buf, (png_size_t)3);
}
+#else
+ /* This is a little slower but some buggy compilers need to do this instead */
+ pal_ptr=palette;
+ for (i = 0; i < num_pal; i++)
+ {
+ buf[0] = pal_ptr[i].red;
+ buf[1] = pal_ptr[i].green;
+ buf[2] = pal_ptr[i].blue;
+ png_write_chunk_data(png_ptr, buf, (png_size_t)3);
+ }
+#endif
png_write_chunk_end(png_ptr);
png_ptr->mode |= PNG_HAVE_PLTE;
}
/* write an IDAT chunk */
-void
+void /* PRIVATE */
png_write_IDAT(png_structp png_ptr, png_bytep data, png_size_t length)
{
+#ifdef PNG_USE_LOCAL_ARRAYS
+ PNG_IDAT;
+#endif
png_debug(1, "in png_write_IDAT\n");
- png_write_chunk(png_ptr, png_IDAT, data, length);
+ png_write_chunk(png_ptr, (png_bytep)png_IDAT, data, length);
png_ptr->mode |= PNG_HAVE_IDAT;
}
/* write an IEND chunk */
-void
+void /* PRIVATE */
png_write_IEND(png_structp png_ptr)
{
+#ifdef PNG_USE_LOCAL_ARRAYS
+ PNG_IEND;
+#endif
png_debug(1, "in png_write_IEND\n");
- png_write_chunk(png_ptr, png_IEND, NULL, (png_size_t)0);
+ png_write_chunk(png_ptr, (png_bytep)png_IEND, png_bytep_NULL,
+ (png_size_t)0);
png_ptr->mode |= PNG_HAVE_IEND;
}
#if defined(PNG_WRITE_gAMA_SUPPORTED)
/* write a gAMA chunk */
-void
+#ifdef PNG_FLOATING_POINT_SUPPORTED
+void /* PRIVATE */
png_write_gAMA(png_structp png_ptr, double file_gamma)
{
+#ifdef PNG_USE_LOCAL_ARRAYS
+ PNG_gAMA;
+#endif
png_uint_32 igamma;
png_byte buf[4];
png_debug(1, "in png_write_gAMA\n");
- /* file_gamma is saved in 1/1000000ths */
+ /* file_gamma is saved in 1/100,000ths */
igamma = (png_uint_32)(file_gamma * 100000.0 + 0.5);
png_save_uint_32(buf, igamma);
- png_write_chunk(png_ptr, png_gAMA, buf, (png_size_t)4);
+ png_write_chunk(png_ptr, (png_bytep)png_gAMA, buf, (png_size_t)4);
+}
+#endif
+#ifdef PNG_FIXED_POINT_SUPPORTED
+void /* PRIVATE */
+png_write_gAMA_fixed(png_structp png_ptr, png_fixed_point file_gamma)
+{
+#ifdef PNG_USE_LOCAL_ARRAYS
+ PNG_gAMA;
+#endif
+ png_byte buf[4];
+
+ png_debug(1, "in png_write_gAMA\n");
+ /* file_gamma is saved in 1/100,000ths */
+ png_save_uint_32(buf, (png_uint_32)file_gamma);
+ png_write_chunk(png_ptr, (png_bytep)png_gAMA, buf, (png_size_t)4);
}
#endif
+#endif
#if defined(PNG_WRITE_sRGB_SUPPORTED)
/* write a sRGB chunk */
-void
+void /* PRIVATE */
png_write_sRGB(png_structp png_ptr, int srgb_intent)
{
+#ifdef PNG_USE_LOCAL_ARRAYS
+ PNG_sRGB;
+#endif
png_byte buf[1];
png_debug(1, "in png_write_sRGB\n");
png_warning(png_ptr,
"Invalid sRGB rendering intent specified");
buf[0]=(png_byte)srgb_intent;
- png_write_chunk(png_ptr, png_sRGB, buf, (png_size_t)1);
+ png_write_chunk(png_ptr, (png_bytep)png_sRGB, buf, (png_size_t)1);
+}
+#endif
+
+#if defined(PNG_WRITE_iCCP_SUPPORTED)
+/* write an iCCP chunk */
+void /* PRIVATE */
+png_write_iCCP(png_structp png_ptr, png_charp name, int compression_type,
+ png_charp profile, int profile_len)
+{
+#ifdef PNG_USE_LOCAL_ARRAYS
+ PNG_iCCP;
+#endif
+ png_size_t name_len;
+ png_charp new_name;
+ compression_state comp;
+
+ png_debug(1, "in png_write_iCCP\n");
+ if (name == NULL || (name_len = png_check_keyword(png_ptr, name,
+ &new_name)) == 0)
+ {
+ png_warning(png_ptr, "Empty keyword in iCCP chunk");
+ return;
+ }
+
+ if (compression_type != PNG_COMPRESSION_TYPE_BASE)
+ png_warning(png_ptr, "Unknown compression type in iCCP chunk");
+
+ if (profile == NULL)
+ profile_len = 0;
+
+ if (profile_len)
+ profile_len = png_text_compress(png_ptr, profile, (png_size_t)profile_len,
+ PNG_COMPRESSION_TYPE_BASE, &comp);
+
+ /* make sure we include the NULL after the name and the compression type */
+ png_write_chunk_start(png_ptr, (png_bytep)png_iCCP,
+ (png_uint_32)name_len+profile_len+2);
+ new_name[name_len+1]=0x00;
+ png_write_chunk_data(png_ptr, (png_bytep)new_name, name_len + 2);
+
+ if (profile_len)
+ png_write_compressed_data_out(png_ptr, &comp);
+
+ png_write_chunk_end(png_ptr);
+ png_free(png_ptr, new_name);
+}
+#endif
+
+#if defined(PNG_WRITE_sPLT_SUPPORTED)
+/* write a sPLT chunk */
+void /* PRIVATE */
+png_write_sPLT(png_structp png_ptr, png_sPLT_tp spalette)
+{
+#ifdef PNG_USE_LOCAL_ARRAYS
+ PNG_sPLT;
+#endif
+ png_size_t name_len;
+ png_charp new_name;
+ png_byte entrybuf[10];
+ int entry_size = (spalette->depth == 8 ? 6 : 10);
+ int palette_size = entry_size * spalette->nentries;
+ png_sPLT_entryp ep;
+#ifdef PNG_NO_POINTER_INDEXING
+ int i;
+#endif
+
+ png_debug(1, "in png_write_sPLT\n");
+ if (spalette->name == NULL || (name_len = png_check_keyword(png_ptr,
+ spalette->name, &new_name))==0)
+ {
+ png_warning(png_ptr, "Empty keyword in sPLT chunk");
+ return;
+ }
+
+ /* make sure we include the NULL after the name */
+ png_write_chunk_start(png_ptr, (png_bytep)png_sPLT,
+ (png_uint_32)(name_len + 2 + palette_size));
+ png_write_chunk_data(png_ptr, (png_bytep)new_name, name_len + 1);
+ png_write_chunk_data(png_ptr, (png_bytep)&spalette->depth, 1);
+
+ /* loop through each palette entry, writing appropriately */
+#ifndef PNG_NO_POINTER_INDEXING
+ for (ep = spalette->entries; ep<spalette->entries+spalette->nentries; ep++)
+ {
+ if (spalette->depth == 8)
+ {
+ entrybuf[0] = (png_byte)ep->red;
+ entrybuf[1] = (png_byte)ep->green;
+ entrybuf[2] = (png_byte)ep->blue;
+ entrybuf[3] = (png_byte)ep->alpha;
+ png_save_uint_16(entrybuf + 4, ep->frequency);
+ }
+ else
+ {
+ png_save_uint_16(entrybuf + 0, ep->red);
+ png_save_uint_16(entrybuf + 2, ep->green);
+ png_save_uint_16(entrybuf + 4, ep->blue);
+ png_save_uint_16(entrybuf + 6, ep->alpha);
+ png_save_uint_16(entrybuf + 8, ep->frequency);
+ }
+ png_write_chunk_data(png_ptr, entrybuf, (png_size_t)entry_size);
+ }
+#else
+ ep=spalette->entries;
+ for (i=0; i>spalette->nentries; i++)
+ {
+ if (spalette->depth == 8)
+ {
+ entrybuf[0] = (png_byte)ep[i].red;
+ entrybuf[1] = (png_byte)ep[i].green;
+ entrybuf[2] = (png_byte)ep[i].blue;
+ entrybuf[3] = (png_byte)ep[i].alpha;
+ png_save_uint_16(entrybuf + 4, ep[i].frequency);
+ }
+ else
+ {
+ png_save_uint_16(entrybuf + 0, ep[i].red);
+ png_save_uint_16(entrybuf + 2, ep[i].green);
+ png_save_uint_16(entrybuf + 4, ep[i].blue);
+ png_save_uint_16(entrybuf + 6, ep[i].alpha);
+ png_save_uint_16(entrybuf + 8, ep[i].frequency);
+ }
+ png_write_chunk_data(png_ptr, entrybuf, entry_size);
+ }
+#endif
+
+ png_write_chunk_end(png_ptr);
+ png_free(png_ptr, new_name);
}
#endif
#if defined(PNG_WRITE_sBIT_SUPPORTED)
/* write the sBIT chunk */
-void
+void /* PRIVATE */
png_write_sBIT(png_structp png_ptr, png_color_8p sbit, int color_type)
{
+#ifdef PNG_USE_LOCAL_ARRAYS
+ PNG_sBIT;
+#endif
png_byte buf[4];
png_size_t size;
{
png_byte maxbits;
- maxbits = color_type==PNG_COLOR_TYPE_PALETTE ? 8 : png_ptr->usr_bit_depth;
+ maxbits = (png_byte)(color_type==PNG_COLOR_TYPE_PALETTE ? 8 :
+ png_ptr->usr_bit_depth);
if (sbit->red == 0 || sbit->red > maxbits ||
sbit->green == 0 || sbit->green > maxbits ||
sbit->blue == 0 || sbit->blue > maxbits)
buf[size++] = sbit->alpha;
}
- png_write_chunk(png_ptr, png_sBIT, buf, size);
+ png_write_chunk(png_ptr, (png_bytep)png_sBIT, buf, size);
}
#endif
#if defined(PNG_WRITE_cHRM_SUPPORTED)
/* write the cHRM chunk */
-void
+#ifdef PNG_FLOATING_POINT_SUPPORTED
+void /* PRIVATE */
png_write_cHRM(png_structp png_ptr, double white_x, double white_y,
double red_x, double red_y, double green_x, double green_y,
double blue_x, double blue_y)
{
- png_uint_32 itemp;
+#ifdef PNG_USE_LOCAL_ARRAYS
+ PNG_cHRM;
+#endif
png_byte buf[32];
+ png_uint_32 itemp;
png_debug(1, "in png_write_cHRM\n");
- /* each value is saved int 1/1000000ths */
+ /* each value is saved in 1/100,000ths */
if (white_x < 0 || white_x > 0.8 || white_y < 0 || white_y > 0.8 ||
white_x + white_y > 1.0)
{
png_warning(png_ptr, "Invalid cHRM white point specified");
+#if !defined(PNG_NO_CONSOLE_IO)
+ fprintf(stderr,"white_x=%f, white_y=%f\n",white_x, white_y);
+#endif
return;
}
itemp = (png_uint_32)(white_x * 100000.0 + 0.5);
itemp = (png_uint_32)(blue_y * 100000.0 + 0.5);
png_save_uint_32(buf + 28, itemp);
- png_write_chunk(png_ptr, png_cHRM, buf, (png_size_t)32);
+ png_write_chunk(png_ptr, (png_bytep)png_cHRM, buf, (png_size_t)32);
+}
+#endif
+#ifdef PNG_FIXED_POINT_SUPPORTED
+void /* PRIVATE */
+png_write_cHRM_fixed(png_structp png_ptr, png_fixed_point white_x,
+ png_fixed_point white_y, png_fixed_point red_x, png_fixed_point red_y,
+ png_fixed_point green_x, png_fixed_point green_y, png_fixed_point blue_x,
+ png_fixed_point blue_y)
+{
+#ifdef PNG_USE_LOCAL_ARRAYS
+ PNG_cHRM;
+#endif
+ png_byte buf[32];
+
+ png_debug(1, "in png_write_cHRM\n");
+ /* each value is saved in 1/100,000ths */
+ if (white_x > 80000L || white_y > 80000L || white_x + white_y > 100000L)
+ {
+ png_warning(png_ptr, "Invalid fixed cHRM white point specified");
+#if !defined(PNG_NO_CONSOLE_IO)
+ fprintf(stderr,"white_x=%ld, white_y=%ld\n",white_x, white_y);
+#endif
+ return;
+ }
+ png_save_uint_32(buf, (png_uint_32)white_x);
+ png_save_uint_32(buf + 4, (png_uint_32)white_y);
+
+ if (red_x > 80000L || red_y > 80000L || red_x + red_y > 100000L)
+ {
+ png_warning(png_ptr, "Invalid cHRM fixed red point specified");
+ return;
+ }
+ png_save_uint_32(buf + 8, (png_uint_32)red_x);
+ png_save_uint_32(buf + 12, (png_uint_32)red_y);
+
+ if (green_x > 80000L || green_y > 80000L || green_x + green_y > 100000L)
+ {
+ png_warning(png_ptr, "Invalid fixed cHRM green point specified");
+ return;
+ }
+ png_save_uint_32(buf + 16, (png_uint_32)green_x);
+ png_save_uint_32(buf + 20, (png_uint_32)green_y);
+
+ if (blue_x > 80000L || blue_y > 80000L || blue_x + blue_y > 100000L)
+ {
+ png_warning(png_ptr, "Invalid fixed cHRM blue point specified");
+ return;
+ }
+ png_save_uint_32(buf + 24, (png_uint_32)blue_x);
+ png_save_uint_32(buf + 28, (png_uint_32)blue_y);
+
+ png_write_chunk(png_ptr, (png_bytep)png_cHRM, buf, (png_size_t)32);
}
#endif
+#endif
#if defined(PNG_WRITE_tRNS_SUPPORTED)
/* write the tRNS chunk */
-void
+void /* PRIVATE */
png_write_tRNS(png_structp png_ptr, png_bytep trans, png_color_16p tran,
int num_trans, int color_type)
{
+#ifdef PNG_USE_LOCAL_ARRAYS
+ PNG_tRNS;
+#endif
png_byte buf[6];
png_debug(1, "in png_write_tRNS\n");
return;
}
/* write the chunk out as it is */
- png_write_chunk(png_ptr, png_tRNS, trans, (png_size_t)num_trans);
+ png_write_chunk(png_ptr, (png_bytep)png_tRNS, trans, (png_size_t)num_trans);
}
else if (color_type == PNG_COLOR_TYPE_GRAY)
{
/* one 16 bit value */
+ if(tran->gray >= (1 << png_ptr->bit_depth))
+ {
+ png_warning(png_ptr,
+ "Ignoring attempt to write tRNS chunk out-of-range for bit_depth");
+ return;
+ }
png_save_uint_16(buf, tran->gray);
- png_write_chunk(png_ptr, png_tRNS, buf, (png_size_t)2);
+ png_write_chunk(png_ptr, (png_bytep)png_tRNS, buf, (png_size_t)2);
}
else if (color_type == PNG_COLOR_TYPE_RGB)
{
png_save_uint_16(buf, tran->red);
png_save_uint_16(buf + 2, tran->green);
png_save_uint_16(buf + 4, tran->blue);
- png_write_chunk(png_ptr, png_tRNS, buf, (png_size_t)6);
+ if(png_ptr->bit_depth == 8 && (buf[0] | buf[2] | buf[4]))
+ {
+ png_warning(png_ptr,
+ "Ignoring attempt to write 16-bit tRNS chunk when bit_depth is 8");
+ return;
+ }
+ png_write_chunk(png_ptr, (png_bytep)png_tRNS, buf, (png_size_t)6);
}
else
{
#if defined(PNG_WRITE_bKGD_SUPPORTED)
/* write the background chunk */
-void
+void /* PRIVATE */
png_write_bKGD(png_structp png_ptr, png_color_16p back, int color_type)
{
+#ifdef PNG_USE_LOCAL_ARRAYS
+ PNG_bKGD;
+#endif
png_byte buf[6];
png_debug(1, "in png_write_bKGD\n");
if (color_type == PNG_COLOR_TYPE_PALETTE)
{
- if (back->index > png_ptr->num_palette)
+ if (
+#if defined(PNG_MNG_FEATURES_SUPPORTED)
+ (png_ptr->num_palette ||
+ (!(png_ptr->mng_features_permitted & PNG_FLAG_MNG_EMPTY_PLTE))) &&
+#endif
+ back->index > png_ptr->num_palette)
{
png_warning(png_ptr, "Invalid background palette index");
return;
}
buf[0] = back->index;
- png_write_chunk(png_ptr, png_bKGD, buf, (png_size_t)1);
+ png_write_chunk(png_ptr, (png_bytep)png_bKGD, buf, (png_size_t)1);
}
else if (color_type & PNG_COLOR_MASK_COLOR)
{
png_save_uint_16(buf, back->red);
png_save_uint_16(buf + 2, back->green);
png_save_uint_16(buf + 4, back->blue);
- png_write_chunk(png_ptr, png_bKGD, buf, (png_size_t)6);
+ if(png_ptr->bit_depth == 8 && (buf[0] | buf[2] | buf[4]))
+ {
+ png_warning(png_ptr,
+ "Ignoring attempt to write 16-bit bKGD chunk when bit_depth is 8");
+ return;
+ }
+ png_write_chunk(png_ptr, (png_bytep)png_bKGD, buf, (png_size_t)6);
}
else
{
+ if(back->gray >= (1 << png_ptr->bit_depth))
+ {
+ png_warning(png_ptr,
+ "Ignoring attempt to write bKGD chunk out-of-range for bit_depth");
+ return;
+ }
png_save_uint_16(buf, back->gray);
- png_write_chunk(png_ptr, png_bKGD, buf, (png_size_t)2);
+ png_write_chunk(png_ptr, (png_bytep)png_bKGD, buf, (png_size_t)2);
}
}
#endif
#if defined(PNG_WRITE_hIST_SUPPORTED)
/* write the histogram */
-void
+void /* PRIVATE */
png_write_hIST(png_structp png_ptr, png_uint_16p hist, int num_hist)
{
+#ifdef PNG_USE_LOCAL_ARRAYS
+ PNG_hIST;
+#endif
int i;
png_byte buf[3];
return;
}
- png_write_chunk_start(png_ptr, png_hIST, (png_uint_32)(num_hist * 2));
+ png_write_chunk_start(png_ptr, (png_bytep)png_hIST, (png_uint_32)(num_hist * 2));
for (i = 0; i < num_hist; i++)
{
png_save_uint_16(buf, hist[i]);
}
#endif
-#if defined(PNG_WRITE_tEXt_SUPPORTED) || defined(PNG_WRITE_zTXt_SUPPORTED) || \
- defined(PNG_WRITE_pCAL_SUPPORTED)
+#if defined(PNG_WRITE_TEXT_SUPPORTED) || defined(PNG_WRITE_pCAL_SUPPORTED) || \
+ defined(PNG_WRITE_iCCP_SUPPORTED) || defined(PNG_WRITE_sPLT_SUPPORTED)
/* Check that the tEXt or zTXt keyword is valid per PNG 1.0 specification,
* and if invalid, correct the keyword rather than discarding the entire
* chunk. The PNG 1.0 specification requires keywords 1-79 characters in
* by the calling routine. This avoids problems with trying to write to
* static keywords without having to have duplicate copies of the strings.
*/
-png_size_t
+png_size_t /* PRIVATE */
png_check_keyword(png_structp png_ptr, png_charp key, png_charpp new_key)
{
png_size_t key_len;
png_charp kp, dp;
int kflag;
+ int kwarn=0;
png_debug(1, "in png_check_keyword\n");
*new_key = NULL;
if (key == NULL || (key_len = png_strlen(key)) == 0)
{
- png_chunk_warning(png_ptr, "zero length keyword");
+ png_warning(png_ptr, "zero length keyword");
return ((png_size_t)0);
}
png_debug1(2, "Keyword to be checked is '%s'\n", key);
- *new_key = (png_charp)png_malloc(png_ptr, (png_uint_32)(key_len + 1));
+ *new_key = (png_charp)png_malloc(png_ptr, (png_uint_32)(key_len + 2));
/* Replace non-printing characters with a blank and print a warning */
for (kp = key, dp = *new_key; *kp != '\0'; kp++, dp++)
{
if (*kp < 0x20 || (*kp > 0x7E && (png_byte)*kp < 0xA1))
{
-#if !defined(PNG_NO_STDIO)
+#if !defined(PNG_NO_STDIO) && !defined(_WIN32_WCE)
char msg[40];
sprintf(msg, "invalid keyword character 0x%02X", *kp);
- png_chunk_warning(png_ptr, msg);
+ png_warning(png_ptr, msg);
#else
- png_chunk_warning(png_ptr, "invalid character in keyword");
+ png_warning(png_ptr, "invalid character in keyword");
#endif
*dp = ' ';
}
kp = *new_key + key_len - 1;
if (*kp == ' ')
{
- png_chunk_warning(png_ptr, "trailing spaces removed from keyword");
+ png_warning(png_ptr, "trailing spaces removed from keyword");
while (*kp == ' ')
{
kp = *new_key;
if (*kp == ' ')
{
- png_chunk_warning(png_ptr, "leading spaces removed from keyword");
+ png_warning(png_ptr, "leading spaces removed from keyword");
while (*kp == ' ')
{
else if (*kp == ' ')
{
key_len--;
+ kwarn=1;
}
else
{
}
}
*dp = '\0';
+ if(kwarn)
+ png_warning(png_ptr, "extra interior spaces removed from keyword");
if (key_len == 0)
{
- png_chunk_warning(png_ptr, "zero length keyword");
+ png_free(png_ptr, *new_key);
+ *new_key=NULL;
+ png_warning(png_ptr, "Zero length keyword");
}
if (key_len > 79)
{
- png_chunk_warning(png_ptr, "keyword length must be 1 - 79 characters");
+ png_warning(png_ptr, "keyword length must be 1 - 79 characters");
new_key[79] = '\0';
key_len = 79;
}
#if defined(PNG_WRITE_tEXt_SUPPORTED)
/* write a tEXt chunk */
-void
+void /* PRIVATE */
png_write_tEXt(png_structp png_ptr, png_charp key, png_charp text,
png_size_t text_len)
{
+#ifdef PNG_USE_LOCAL_ARRAYS
+ PNG_tEXt;
+#endif
png_size_t key_len;
png_charp new_key;
if (text == NULL || *text == '\0')
text_len = 0;
+ else
+ text_len = png_strlen(text);
/* make sure we include the 0 after the key */
- png_write_chunk_start(png_ptr, png_tEXt, (png_uint_32)key_len+text_len+1);
+ png_write_chunk_start(png_ptr, (png_bytep)png_tEXt, (png_uint_32)key_len+text_len+1);
+ /*
+ * We leave it to the application to meet PNG-1.0 requirements on the
+ * contents of the text. PNG-1.0 through PNG-1.2 discourage the use of
+ * any non-Latin-1 characters except for NEWLINE. ISO PNG will forbid them.
+ * The NUL character is forbidden by PNG-1.0 through PNG-1.2 and ISO PNG.
+ */
png_write_chunk_data(png_ptr, (png_bytep)new_key, key_len + 1);
if (text_len)
png_write_chunk_data(png_ptr, (png_bytep)text, text_len);
#if defined(PNG_WRITE_zTXt_SUPPORTED)
/* write a compressed text chunk */
-void
+void /* PRIVATE */
png_write_zTXt(png_structp png_ptr, png_charp key, png_charp text,
png_size_t text_len, int compression)
{
+#ifdef PNG_USE_LOCAL_ARRAYS
+ PNG_zTXt;
+#endif
png_size_t key_len;
char buf[1];
png_charp new_key;
- int i, ret;
- png_charpp output_ptr = NULL; /* array of pointers to output */
- int num_output_ptr = 0; /* number of output pointers used */
- int max_output_ptr = 0; /* size of output_ptr */
+ compression_state comp;
png_debug(1, "in png_write_zTXt\n");
return;
}
- png_free(png_ptr, new_key);
-
- if (compression >= PNG_TEXT_COMPRESSION_LAST)
- {
-#if !defined(PNG_NO_STDIO)
- char msg[50];
- sprintf(msg, "Unknown zTXt compression type %d", compression);
- png_warning(png_ptr, msg);
-#else
- png_warning(png_ptr, "Unknown zTXt compression type");
-#endif
- compression = PNG_TEXT_COMPRESSION_zTXt;
- }
-
- /* We can't write the chunk until we find out how much data we have,
- * which means we need to run the compressor first and save the
- * output. This shouldn't be a problem, as the vast majority of
- * comments should be reasonable, but we will set up an array of
- * malloc'd pointers to be sure.
- *
- * If we knew the application was well behaved, we could simplify this
- * greatly by assuming we can always malloc an output buffer large
- * enough to hold the compressed text ((1001 * text_len / 1000) + 12)
- * and malloc this directly. The only time this would be a bad idea is
- * if we can't malloc more than 64K and we have 64K of random input
- * data, or if the input string is incredibly large (although this
- * wouldn't cause a failure, just a slowdown due to swapping).
- */
+ text_len = png_strlen(text);
- /* set up the compression buffers */
- png_ptr->zstream.avail_in = (uInt)text_len;
- png_ptr->zstream.next_in = (Bytef *)text;
- png_ptr->zstream.avail_out = (uInt)png_ptr->zbuf_size;
- png_ptr->zstream.next_out = (Bytef *)png_ptr->zbuf;
+ png_free(png_ptr, new_key);
- /* this is the same compression loop as in png_write_row() */
- do
- {
- /* compress the data */
- ret = deflate(&png_ptr->zstream, Z_NO_FLUSH);
- if (ret != Z_OK)
- {
- /* error */
- if (png_ptr->zstream.msg != NULL)
- png_error(png_ptr, png_ptr->zstream.msg);
- else
- png_error(png_ptr, "zlib error");
- }
- /* check to see if we need more room */
- if (!png_ptr->zstream.avail_out && png_ptr->zstream.avail_in)
- {
- /* make sure the output array has room */
- if (num_output_ptr >= max_output_ptr)
- {
- int old_max;
+ /* compute the compressed data; do it now for the length */
+ text_len = png_text_compress(png_ptr, text, text_len, compression,
+ &comp);
- old_max = max_output_ptr;
- max_output_ptr = num_output_ptr + 4;
- if (output_ptr != NULL)
- {
- png_charpp old_ptr;
+ /* write start of chunk */
+ png_write_chunk_start(png_ptr, (png_bytep)png_zTXt, (png_uint_32)
+ (key_len+text_len+2));
+ /* write key */
+ png_write_chunk_data(png_ptr, (png_bytep)key, key_len + 1);
+ buf[0] = (png_byte)compression;
+ /* write compression */
+ png_write_chunk_data(png_ptr, (png_bytep)buf, (png_size_t)1);
+ /* write the compressed data */
+ png_write_compressed_data_out(png_ptr, &comp);
- old_ptr = output_ptr;
- output_ptr = (png_charpp)png_malloc(png_ptr,
- (png_uint_32)(max_output_ptr * sizeof (png_charpp)));
- png_memcpy(output_ptr, old_ptr, old_max * sizeof (png_charp));
- png_free(png_ptr, old_ptr);
- }
- else
- output_ptr = (png_charpp)png_malloc(png_ptr,
- (png_uint_32)(max_output_ptr * sizeof (png_charp)));
- }
+ /* close the chunk */
+ png_write_chunk_end(png_ptr);
+}
+#endif
- /* save the data */
- output_ptr[num_output_ptr] = (png_charp)png_malloc(png_ptr,
- (png_uint_32)png_ptr->zbuf_size);
- png_memcpy(output_ptr[num_output_ptr], png_ptr->zbuf,
- png_ptr->zbuf_size);
- num_output_ptr++;
+#if defined(PNG_WRITE_iTXt_SUPPORTED)
+/* write an iTXt chunk */
+void /* PRIVATE */
+png_write_iTXt(png_structp png_ptr, int compression, png_charp key,
+ png_charp lang, png_charp lang_key, png_charp text)
+{
+#ifdef PNG_USE_LOCAL_ARRAYS
+ PNG_iTXt;
+#endif
+ png_size_t lang_len, key_len, lang_key_len, text_len;
+ png_charp new_lang, new_key;
+ png_byte cbuf[2];
+ compression_state comp;
- /* and reset the buffer */
- png_ptr->zstream.avail_out = (uInt)png_ptr->zbuf_size;
- png_ptr->zstream.next_out = png_ptr->zbuf;
- }
- /* continue until we don't have any more to compress */
- } while (png_ptr->zstream.avail_in);
+ png_debug(1, "in png_write_iTXt\n");
- /* finish the compression */
- do
+ if (key == NULL || (key_len = png_check_keyword(png_ptr, key, &new_key))==0)
{
- /* tell zlib we are finished */
- ret = deflate(&png_ptr->zstream, Z_FINISH);
- if (ret != Z_OK && ret != Z_STREAM_END)
- {
- /* we got an error */
- if (png_ptr->zstream.msg != NULL)
- png_error(png_ptr, png_ptr->zstream.msg);
- else
- png_error(png_ptr, "zlib error");
- }
+ png_warning(png_ptr, "Empty keyword in iTXt chunk");
+ return;
+ }
+ if (lang == NULL || (lang_len = png_check_keyword(png_ptr, lang, &new_lang))==0)
+ {
+ png_warning(png_ptr, "Empty language field in iTXt chunk");
+ new_lang = NULL;
+ lang_len = 0;
+ }
- /* check to see if we need more room */
- if (!(png_ptr->zstream.avail_out) && ret == Z_OK)
- {
- /* check to make sure our output array has room */
- if (num_output_ptr >= max_output_ptr)
- {
- int old_max;
+ if (lang_key == NULL)
+ lang_key_len = 0;
+ else
+ lang_key_len = png_strlen(lang_key);
- old_max = max_output_ptr;
- max_output_ptr = num_output_ptr + 4;
- if (output_ptr != NULL)
- {
- png_charpp old_ptr;
+ if (text == NULL)
+ text_len = 0;
+ else
+ text_len = png_strlen(text);
- old_ptr = output_ptr;
- /* This could be optimized to realloc() */
- output_ptr = (png_charpp)png_malloc(png_ptr,
- (png_uint_32)(max_output_ptr * sizeof (png_charpp)));
- png_memcpy(output_ptr, old_ptr, old_max * sizeof (png_charp));
- png_free(png_ptr, old_ptr);
- }
- else
- output_ptr = (png_charpp)png_malloc(png_ptr,
- (png_uint_32)(max_output_ptr * sizeof (png_charp)));
- }
+ /* compute the compressed data; do it now for the length */
+ text_len = png_text_compress(png_ptr, text, text_len, compression-2,
+ &comp);
- /* save off the data */
- output_ptr[num_output_ptr] = (png_charp)png_malloc(png_ptr,
- (png_uint_32)png_ptr->zbuf_size);
- png_memcpy(output_ptr[num_output_ptr], png_ptr->zbuf,
- png_ptr->zbuf_size);
- num_output_ptr++;
- /* and reset the buffer pointers */
- png_ptr->zstream.avail_out = (uInt)png_ptr->zbuf_size;
- png_ptr->zstream.next_out = png_ptr->zbuf;
- }
- } while (ret != Z_STREAM_END);
+ /* make sure we include the compression flag, the compression byte,
+ * and the NULs after the key, lang, and lang_key parts */
- /* text length is number of buffers plus last buffer */
- text_len = png_ptr->zbuf_size * num_output_ptr;
- if (png_ptr->zstream.avail_out < png_ptr->zbuf_size)
- text_len += png_ptr->zbuf_size - (png_size_t)png_ptr->zstream.avail_out;
+ png_write_chunk_start(png_ptr, (png_bytep)png_iTXt,
+ (png_uint_32)(
+ 5 /* comp byte, comp flag, terminators for key, lang and lang_key */
+ + key_len
+ + lang_len
+ + lang_key_len
+ + text_len));
- /* write start of chunk */
- png_write_chunk_start(png_ptr, png_zTXt, (png_uint_32)(key_len+text_len+2));
- /* write key */
- png_write_chunk_data(png_ptr, (png_bytep)key, key_len + 1);
- buf[0] = (png_byte)compression;
- /* write compression */
- png_write_chunk_data(png_ptr, (png_bytep)buf, (png_size_t)1);
+ /*
+ * We leave it to the application to meet PNG-1.0 requirements on the
+ * contents of the text. PNG-1.0 through PNG-1.2 discourage the use of
+ * any non-Latin-1 characters except for NEWLINE. ISO PNG will forbid them.
+ * The NUL character is forbidden by PNG-1.0 through PNG-1.2 and ISO PNG.
+ */
+ png_write_chunk_data(png_ptr, (png_bytep)new_key, key_len + 1);
- /* write saved output buffers, if any */
- for (i = 0; i < num_output_ptr; i++)
- {
- png_write_chunk_data(png_ptr,(png_bytep)output_ptr[i],png_ptr->zbuf_size);
- png_free(png_ptr, output_ptr[i]);
- }
- if (max_output_ptr != 0)
- png_free(png_ptr, output_ptr);
- /* write anything left in zbuf */
- if (png_ptr->zstream.avail_out < (png_uint_32)png_ptr->zbuf_size)
- png_write_chunk_data(png_ptr, png_ptr->zbuf,
- png_ptr->zbuf_size - png_ptr->zstream.avail_out);
- /* close the chunk */
- png_write_chunk_end(png_ptr);
+ /* set the compression flag */
+ if (compression == PNG_ITXT_COMPRESSION_NONE || \
+ compression == PNG_TEXT_COMPRESSION_NONE)
+ cbuf[0] = 0;
+ else /* compression == PNG_ITXT_COMPRESSION_zTXt */
+ cbuf[0] = 1;
+ /* set the compression method */
+ cbuf[1] = 0;
+ png_write_chunk_data(png_ptr, cbuf, 2);
+
+ cbuf[0] = 0;
+ png_write_chunk_data(png_ptr, (new_lang ? (png_bytep)new_lang : cbuf), lang_len + 1);
+ png_write_chunk_data(png_ptr, (lang_key ? (png_bytep)lang_key : cbuf), lang_key_len + 1);
+ png_write_compressed_data_out(png_ptr, &comp);
- /* reset zlib for another zTXt or the image data */
- deflateReset(&png_ptr->zstream);
+ png_write_chunk_end(png_ptr);
+ png_free(png_ptr, new_key);
+ if (new_lang)
+ png_free(png_ptr, new_lang);
}
#endif
-
#if defined(PNG_WRITE_oFFs_SUPPORTED)
/* write the oFFs chunk */
-void
-png_write_oFFs(png_structp png_ptr, png_uint_32 x_offset,
- png_uint_32 y_offset,
+void /* PRIVATE */
+png_write_oFFs(png_structp png_ptr, png_int_32 x_offset, png_int_32 y_offset,
int unit_type)
{
+#ifdef PNG_USE_LOCAL_ARRAYS
+ PNG_oFFs;
+#endif
png_byte buf[9];
png_debug(1, "in png_write_oFFs\n");
if (unit_type >= PNG_OFFSET_LAST)
png_warning(png_ptr, "Unrecognized unit type for oFFs chunk");
- png_save_uint_32(buf, x_offset);
- png_save_uint_32(buf + 4, y_offset);
+ png_save_int_32(buf, x_offset);
+ png_save_int_32(buf + 4, y_offset);
buf[8] = (png_byte)unit_type;
- png_write_chunk(png_ptr, png_oFFs, buf, (png_size_t)9);
+ png_write_chunk(png_ptr, (png_bytep)png_oFFs, buf, (png_size_t)9);
}
#endif
#if defined(PNG_WRITE_pCAL_SUPPORTED)
-/* write the pCAL chunk (png-scivis-19970203) */
-void
+/* write the pCAL chunk (described in the PNG extensions document) */
+void /* PRIVATE */
png_write_pCAL(png_structp png_ptr, png_charp purpose, png_int_32 X0,
png_int_32 X1, int type, int nparams, png_charp units, png_charpp params)
{
+#ifdef PNG_USE_LOCAL_ARRAYS
+ PNG_pCAL;
+#endif
png_size_t purpose_len, units_len, total_len;
png_uint_32p params_len;
png_byte buf[10];
png_warning(png_ptr, "Unrecognized equation type for pCAL chunk");
purpose_len = png_check_keyword(png_ptr, purpose, &new_purpose) + 1;
- png_debug1(3, "pCAL purpose length = %d\n", purpose_len);
+ png_debug1(3, "pCAL purpose length = %d\n", (int)purpose_len);
units_len = png_strlen(units) + (nparams == 0 ? 0 : 1);
- png_debug1(3, "pCAL units length = %d\n", units_len);
+ png_debug1(3, "pCAL units length = %d\n", (int)units_len);
total_len = purpose_len + units_len + 10;
params_len = (png_uint_32p)png_malloc(png_ptr, (png_uint_32)(nparams
for (i = 0; i < nparams; i++)
{
params_len[i] = png_strlen(params[i]) + (i == nparams - 1 ? 0 : 1);
- png_debug2(3, "pCAL parameter %d length = %d\n", i, params_len[i]);
+ png_debug2(3, "pCAL parameter %d length = %lu\n", i, params_len[i]);
total_len += (png_size_t)params_len[i];
}
- png_debug1(3, "pCAL total length = %d\n", total_len);
- png_write_chunk_start(png_ptr, png_pCAL, (png_uint_32)total_len);
+ png_debug1(3, "pCAL total length = %d\n", (int)total_len);
+ png_write_chunk_start(png_ptr, (png_bytep)png_pCAL, (png_uint_32)total_len);
png_write_chunk_data(png_ptr, (png_bytep)new_purpose, purpose_len);
png_save_int_32(buf, X0);
png_save_int_32(buf + 4, X1);
}
#endif
+#if defined(PNG_WRITE_sCAL_SUPPORTED)
+/* write the sCAL chunk */
+#if defined(PNG_FLOATING_POINT_SUPPORTED) && !defined(PNG_NO_STDIO)
+void /* PRIVATE */
+png_write_sCAL(png_structp png_ptr, int unit, double width,double height)
+{
+#ifdef PNG_USE_LOCAL_ARRAYS
+ PNG_sCAL;
+#endif
+ png_size_t total_len;
+ char wbuf[32], hbuf[32];
+
+ png_debug(1, "in png_write_sCAL\n");
+
+#if defined(_WIN32_WCE)
+/* sprintf() function is not supported on WindowsCE */
+ {
+ wchar_t wc_buf[32];
+ swprintf(wc_buf, TEXT("%12.12e"), width);
+ WideCharToMultiByte(CP_ACP, 0, wc_buf, -1, wbuf, 32, NULL, NULL);
+ swprintf(wc_buf, TEXT("%12.12e"), height);
+ WideCharToMultiByte(CP_ACP, 0, wc_buf, -1, hbuf, 32, NULL, NULL);
+ }
+#else
+ sprintf(wbuf, "%12.12e", width);
+ sprintf(hbuf, "%12.12e", height);
+#endif
+ total_len = 1 + png_strlen(wbuf)+1 + png_strlen(hbuf);
+
+ png_debug1(3, "sCAL total length = %d\n", (int)total_len);
+ png_write_chunk_start(png_ptr, (png_bytep)png_sCAL, (png_uint_32)total_len);
+ png_write_chunk_data(png_ptr, (png_bytep)&unit, 1);
+ png_write_chunk_data(png_ptr, (png_bytep)wbuf, png_strlen(wbuf)+1);
+ png_write_chunk_data(png_ptr, (png_bytep)hbuf, png_strlen(hbuf));
+
+ png_write_chunk_end(png_ptr);
+}
+#else
+#ifdef PNG_FIXED_POINT_SUPPORTED
+void /* PRIVATE */
+png_write_sCAL_s(png_structp png_ptr, int unit, png_charp width,
+ png_charp height)
+{
+#ifdef PNG_USE_LOCAL_ARRAYS
+ PNG_sCAL;
+#endif
+ png_size_t total_len;
+ char wbuf[32], hbuf[32];
+
+ png_debug(1, "in png_write_sCAL_s\n");
+
+ png_strcpy(wbuf,(const char *)width);
+ png_strcpy(hbuf,(const char *)height);
+ total_len = 1 + png_strlen(wbuf)+1 + png_strlen(hbuf);
+
+ png_debug1(3, "sCAL total length = %d\n", total_len);
+ png_write_chunk_start(png_ptr, (png_bytep)png_sCAL, (png_uint_32)total_len);
+ png_write_chunk_data(png_ptr, (png_bytep)&unit, 1);
+ png_write_chunk_data(png_ptr, (png_bytep)wbuf, png_strlen(wbuf)+1);
+ png_write_chunk_data(png_ptr, (png_bytep)hbuf, png_strlen(hbuf));
+
+ png_write_chunk_end(png_ptr);
+}
+#endif
+#endif
+#endif
+
#if defined(PNG_WRITE_pHYs_SUPPORTED)
/* write the pHYs chunk */
-void
+void /* PRIVATE */
png_write_pHYs(png_structp png_ptr, png_uint_32 x_pixels_per_unit,
png_uint_32 y_pixels_per_unit,
int unit_type)
{
+#ifdef PNG_USE_LOCAL_ARRAYS
+ PNG_pHYs;
+#endif
png_byte buf[9];
png_debug(1, "in png_write_pHYs\n");
png_save_uint_32(buf + 4, y_pixels_per_unit);
buf[8] = (png_byte)unit_type;
- png_write_chunk(png_ptr, png_pHYs, buf, (png_size_t)9);
+ png_write_chunk(png_ptr, (png_bytep)png_pHYs, buf, (png_size_t)9);
}
#endif
/* Write the tIME chunk. Use either png_convert_from_struct_tm()
* or png_convert_from_time_t(), or fill in the structure yourself.
*/
-void
+void /* PRIVATE */
png_write_tIME(png_structp png_ptr, png_timep mod_time)
{
+#ifdef PNG_USE_LOCAL_ARRAYS
+ PNG_tIME;
+#endif
png_byte buf[7];
png_debug(1, "in png_write_tIME\n");
buf[5] = mod_time->minute;
buf[6] = mod_time->second;
- png_write_chunk(png_ptr, png_tIME, buf, (png_size_t)7);
+ png_write_chunk(png_ptr, (png_bytep)png_tIME, buf, (png_size_t)7);
}
#endif
/* initializes the row writing capability of libpng */
-void
+void /* PRIVATE */
png_write_start_row(png_structp png_ptr)
{
+#ifdef PNG_USE_LOCAL_ARRAYS
+ /* arrays to facilitate easy interlacing - use pass (0 - 6) as index */
+
+ /* start of interlace block */
+ int png_pass_start[7] = {0, 4, 0, 2, 0, 1, 0};
+
+ /* offset to next interlace block */
+ int png_pass_inc[7] = {8, 8, 4, 4, 2, 2, 1};
+
+ /* start of interlace block in the y direction */
+ int png_pass_ystart[7] = {0, 0, 4, 0, 2, 0, 1};
+
+ /* offset to next interlace block in the y direction */
+ int png_pass_yinc[7] = {8, 8, 8, 4, 4, 2, 2};
+#endif
+
png_size_t buf_size;
png_debug(1, "in png_write_start_row\n");
}
/* Internal use only. Called when finished processing a row of data. */
-void
+void /* PRIVATE */
png_write_finish_row(png_structp png_ptr)
{
+#ifdef PNG_USE_LOCAL_ARRAYS
+ /* arrays to facilitate easy interlacing - use pass (0 - 6) as index */
+
+ /* start of interlace block */
+ int png_pass_start[7] = {0, 4, 0, 2, 0, 1, 0};
+
+ /* offset to next interlace block */
+ int png_pass_inc[7] = {8, 8, 4, 4, 2, 2, 1};
+
+ /* start of interlace block in the y direction */
+ int png_pass_ystart[7] = {0, 0, 4, 0, 2, 0, 1};
+
+ /* offset to next interlace block in the y direction */
+ int png_pass_yinc[7] = {8, 8, 8, 4, 4, 2, 2};
+#endif
+
int ret;
png_debug(1, "in png_write_finish_row\n");
/* tell the compressor we are done */
ret = deflate(&png_ptr->zstream, Z_FINISH);
/* check for an error */
- if (ret != Z_OK && ret != Z_STREAM_END)
+ if (ret == Z_OK)
+ {
+ /* check to see if we need more room */
+ if (!(png_ptr->zstream.avail_out))
+ {
+ png_write_IDAT(png_ptr, png_ptr->zbuf, png_ptr->zbuf_size);
+ png_ptr->zstream.next_out = png_ptr->zbuf;
+ png_ptr->zstream.avail_out = (uInt)png_ptr->zbuf_size;
+ }
+ }
+ else if (ret != Z_STREAM_END)
{
if (png_ptr->zstream.msg != NULL)
png_error(png_ptr, png_ptr->zstream.msg);
else
png_error(png_ptr, "zlib error");
}
- /* check to see if we need more room */
- if (!(png_ptr->zstream.avail_out) && ret == Z_OK)
- {
- png_write_IDAT(png_ptr, png_ptr->zbuf, png_ptr->zbuf_size);
- png_ptr->zstream.next_out = png_ptr->zbuf;
- png_ptr->zstream.avail_out = (uInt)png_ptr->zbuf_size;
- }
} while (ret != Z_STREAM_END);
/* write any extra space */
* sp will always be >= dp, so we should never overwrite anything.
* See the default: case for the easiest code to understand.
*/
-void
+void /* PRIVATE */
png_do_write_interlace(png_row_infop row_info, png_bytep row, int pass)
{
+#ifdef PNG_USE_LOCAL_ARRAYS
+ /* arrays to facilitate easy interlacing - use pass (0 - 6) as index */
+
+ /* start of interlace block */
+ int png_pass_start[7] = {0, 4, 0, 2, 0, 1, 0};
+
+ /* offset to next interlace block */
+ int png_pass_inc[7] = {8, 8, 4, 4, 2, 2, 1};
+#endif
+
png_debug(1, "in png_do_write_interlace\n");
/* we don't have to do anything on the last pass (6) */
#if defined(PNG_USELESS_TESTS_SUPPORTED)
i += png_pass_inc[pass])
{
sp = row + (png_size_t)(i >> 3);
- value = (int)(*sp >> (7 - (int)(i & 7))) & 0x1;
+ value = (int)(*sp >> (7 - (int)(i & 0x07))) & 0x01;
d |= (value << shift);
if (shift == 0)
i += png_pass_inc[pass])
{
sp = row + (png_size_t)(i >> 2);
- value = (*sp >> ((3 - (int)(i & 3)) << 1)) & 0x3;
+ value = (*sp >> ((3 - (int)(i & 0x03)) << 1)) & 0x03;
d |= (value << shift);
if (shift == 0)
i += png_pass_inc[pass])
{
sp = row + (png_size_t)(i >> 1);
- value = (*sp >> ((1 - (int)(i & 1)) << 2)) & 0xf;
+ value = (*sp >> ((1 - (int)(i & 0x01)) << 2)) & 0x0f;
d |= (value << shift);
if (shift == 0)
#define PNG_HISHIFT 10
#define PNG_LOMASK ((png_uint_32)0xffffL)
#define PNG_HIMASK ((png_uint_32)(~PNG_LOMASK >> PNG_HISHIFT))
-void
+void /* PRIVATE */
png_write_find_filter(png_structp png_ptr, png_row_infop row_info)
{
png_bytep prev_row, best_row, row_buf;
/* We don't need to test the 'no filter' case if this is the only filter
* that has been chosen, as it doesn't actually do anything to the data.
*/
- if (filter_to_do & PNG_FILTER_NONE &&
+ if ((filter_to_do & PNG_FILTER_NONE) &&
filter_to_do != PNG_FILTER_NONE)
{
png_bytep rp;
/* Do the actual writing of a previously filtered row. */
-void
+void /* PRIVATE */
png_write_filtered_row(png_structp png_ptr, png_bytep filtered_row)
{
png_debug(1, "in png_write_filtered_row\n");
png_debug1(2, "filter = %d\n", filtered_row[0]);
/* set up the zlib input buffer */
+
png_ptr->zstream.next_in = filtered_row;
png_ptr->zstream.avail_in = (uInt)png_ptr->row_info.rowbytes + 1;
/* repeat until we have compressed all the data */
{
png_write_flush(png_ptr);
}
-#endif /* PNG_WRITE_FLUSH_SUPPORTED */
+#endif
}
+#endif /* PNG_WRITE_SUPPORTED */
projects / wxWidgets.git / commitdiff
