2 CHANGES - changes for libpng
5 added reader into png.h
6 fixed small problems in stub file
9 split up pngwrite.c to several files
12 cleaned up writer, adding a few new tranformations
13 fixed some bugs in writer
14 interfaced with zlib 0.5
16 added check for 64 KB blocks for 16 bit machines
18 cleaned up code and commented code
19 simplified time handling into png_time
20 created png_color_16 and png_color_8 to handle color needs
21 cleaned up color type defines
23 made various names more consistant
24 interfaced with zlib 0.71
25 cleaned up zTXt reader and writer (using zlib's Reset functions)
26 split transformations into pngrtran.c and pngwtran.c
28 interfaced with zlib 0.8
29 fixed many reading and writing bugs
30 saved using 3 spaces instead of tabs
32 added png_large_malloc() and png_large_free()
34 cleaned up some compiler warnings
35 added png_start_read_image()
37 cleaned up lots of bugs
38 finished dithering and other stuff
40 changed name from pnglib to libpng
41 version 0.71 [June, 1995]
42 changed pngtest.png for zlib 0.93
43 fixed error in libpng.txt and example.c
46 added png_set_filler()
47 split up pngstub.c into pngmem.c, pngio.c, and pngerror.c
48 added #define's to remove unwanted code
49 moved png_info_init() to png.c
50 added old_size into png_realloc()
51 added functions to manually set filtering and compression info
52 changed compression parameters based on image type
53 optimized filter selection code
55 changed external functions passing floats to doubles (k&r problems?)
56 put all the configurable stuff in pngconf.h
57 enabled png_set_shift to work with paletted images on read
58 added png_read_update_info() - updates info structure with
60 version 0.81 [August, 1995]
61 incorporated Tim Wegner's medium model code (thanks, Tim)
62 version 0.82 [September, 1995]
64 version 0.85 [December, 1995]
65 added more medium model code (almost everything's a far)
66 added i/o, error, and memory callback functions
67 fixed some bugs (16 bit, 4 bit interlaced, etc.)
68 added first run progressive reader (barely tested)
69 version 0.86 [January, 1996]
71 improved documentation
72 version 0.87 [January, 1996]
73 fixed medium model bugs
74 fixed other bugs introduced in 0.85 and 0.86
75 added some minor documentation
76 version 0.88 [January, 1996]
77 fixed progressive bugs
78 replaced tabs with spaces
79 cleaned up documentation
80 added callbacks for read/write and warning/error functions
81 version 0.89 [July, 1996]
82 added new initialization API to make libpng work better with shared libs
83 we now have png_create_read_struct(), png_create_write_struct(),
84 png_create_info_struct(), png_destroy_read_struct(), and
85 png_destroy_write_struct() instead of the separate calls to
86 malloc and png_read_init(), png_info_init(), and png_write_init()
87 changed warning/error callback functions to fix bug - this means you
88 should use the new initialization API if you were using the old
89 png_set_message_fn() calls, and that the old API no longer exists
90 so that people are aware that they need to change their code
91 changed filter selection API to allow selection of multiple filters
92 since it didn't work in previous versions of libpng anyways
93 optimized filter selection code
94 fixed png_set_background() to allow using an arbitrary RGB color for
96 fixed gamma and background correction for paletted images, so
97 png_correct_palette is not needed unless you are correcting an
98 external palette (you will need to #define PNG_CORRECT_PALETTE_SUPPORTED
99 in pngconf.h) - if nobody uses this, it may disappear in the future.
100 fixed bug with Borland 64K memory allocation (Alexander Lehmann)
101 fixed bug in interlace handling (Smarasderagd, I think)
102 added more error checking for writing and image to reduce invalid files
103 separated read and write functions so that they won't both be linked
104 into a binary when only reading or writing functionality is used
105 new pngtest image also has interlacing and zTXt
106 updated documentation to reflect new API
107 version 0.90 [January, 1997]
108 made CRC errors/warnings on critical and ancillary chunks configurable
109 libpng will use the zlib CRC routines by (compile-time) default
110 changed DOS small/medium model memory support - needs zlib 1.04 (Tim Wegner)
111 added external C++ wrapper statements to png.h (Gilles Dauphin)
112 allow PNG file to be read when some or all of file signature has already
113 been read from the beginning of the stream. ****This affects the size
114 of info_struct and invalidates all programs that use a shared libpng****
115 fixed png_filler() declarations
116 fixed? background color conversions
117 fixed order of error function pointers to match documentation
118 current chunk name is now available in png_struct to reduce the number
119 of nearly identical error messages (will simplify multi-lingual
120 support when available)
121 try to get ready for unknown-chunk callback functions:
122 - previously read critical chunks are flagged, so the chunk handling
123 routines can determine if the chunk is in the right place
124 - all chunk handling routines have the same prototypes, so we will
125 be able to handle all chunks via a callback mechanism
126 try to fix Linux "setjmp" buffer size problems
127 removed png_large_malloc, png_large_free, and png_realloc functions.
128 version 0.95 [March, 1997]
129 fixed bug in pngwutil.c allocating "up_row" twice and "avg_row" never
130 fixed bug in PNG file signature compares when start != 0
131 changed parameter type of png_set_filler(...filler...) from png_byte
133 added test for MACOS to ensure that both math.h and fp.h are not #included
134 added macros for libpng to be compiled as a Windows DLL (Andreas Kupries)
135 added "packswap" transformation, which changes the endianness of
136 packed-pixel bytes (Kevin Bracey)
137 added "strip_alpha" transformation, which removes the alpha channel of
138 input images without using it (not neccesarily a good idea)
139 added "swap_alpha" transformation, which puts the alpha channel in front
140 of the color bytes instead of after
141 removed all implicit variable tests which assume NULL == 0 (I think)
142 changed several variables to "png_size_t" to show 16/32-bit limitations
143 added new pCAL chunk read/write support
144 added experimental filter selection weighting (Greg Roelofs)
145 removed old png_set_rgbx() and png_set_xrgb() functions that have been
146 obsolete for about 2 years now (use png_set_filler() instead)
147 added macros to read 16- and 32-bit ints directly from buffer, to be
148 used only on those systems that support it (namely PowerPC and 680x0)
149 With some testing, this may become the default for MACOS/PPC systems.
150 only calculate CRC on data if we are going to use it
151 added macros for zTXt compression type PNG_zTXt_COMPRESSION_???
152 added macros for simple libpng debugging output selectable at compile time
153 removed PNG_READ_END_MODE in progressive reader (Smarasderagd)
154 more description of info_struct in libpng.txt and png.h
155 more instructions in example.c
156 more chunk types tested in pngtest.c
157 renamed pngrcb.c to pngset.c, and all png_read_<chunk> functions to be
158 png_set_<chunk>. We now have corresponding png_get_<chunk>
159 functions in pngget.c to get infomation in info_ptr. This isolates
160 the application from the internal organization of png_info_struct
161 (good for shared library implementations).
162 version 0.96 [May, 1997]
163 fixed serious bug with < 8bpp images introduced in 0.95
164 fixed 256-color transparency bug (Greg Roelofs)
165 fixed up documentation (Greg Roelofs, Laszlo Nyul)
166 fixed "error" in pngconf.h for Linux setjmp() behaviour
167 fixed DOS medium model support (Tim Wegner)
168 fixed png_check_keyword() for case with error in static string text
169 added read of CRC after IEND chunk for embedded PNGs (Laszlo Nyul)
170 added typecasts to quiet compiler errors
171 added more debugging info
172 version 0.97 [January, 1998]
173 removed PNG_USE_OWN_CRC capability
174 relocated png_set_crc_action from pngrutil.c to pngrtran.c
175 fixed typecasts of "new_key", etc. (Andreas Dilger)
176 added RFC 1152 [sic] date support
177 fixed bug in gamma handling of 4-bit grayscale
178 added 2-bit grayscale gamma handling (Glenn R-P)
179 added more typecasts. 65536L becomes (png_uint_32)65536L, etc. (Glenn R-P)
180 minor corrections in libpng.txt
181 added simple sRGB support (Glenn R-P)
182 easier conditional compiling, e.g. define PNG_READ/WRITE_NOT_FULLY_SUPPORTED;
183 all configurable options can be selected from command-line instead
184 of having to edit pngconf.h (Glenn R-P)
185 fixed memory leak in pngwrite.c (free info_ptr->text) (Glenn R-P)
186 added more conditions for png_do_background, to avoid changing
187 black pixels to background when a background is supplied and
188 no pixels are transparent
189 repaired PNG_NO_STDIO behaviour
190 tested NODIV support and made it default behaviour (Greg Roelofs)
191 added "-m" option and PNGTEST_DEBUG_MEMORY to pngtest (John Bowler)
192 regularized version numbering scheme and bumped shared-library major
193 version number to 2 to avoid problems with libpng 0.89 apps (Greg Roelofs)
194 version 0.98 [January, 1998]
195 cleaned up some typos in libpng.txt and in code documentation
196 fixed memory leaks in pCAL chunk processing (Glenn R-P and John Bowler)
197 cosmetic change "display_gamma" to "screen_gamma" in pngrtran.c
198 changed recommendation about file_gamma for PC images to .51 from .45,
199 in example.c and libpng.txt, added comments to distinguish between
200 screen_gamma, viewing_gamma, and display_gamma.
201 changed all references to RFC1152 to read RFC1123 and changed the
202 PNG_TIME_RFC1152_SUPPORTED macro to PNG_TIME_RFC1123_SUPPORTED
203 added png_invert_alpha capability (Glenn R-P -- suggestion by Jon Vincent)
204 changed srgb_intent from png_byte to int to avoid compiler bugs
205 version 0.99 [January 30, 1998]
206 free info_ptr->text instead of end_info_ptr->text in pngread.c (John Bowler)
207 fixed a longstanding "packswap" bug in pngtrans.c
208 fixed some inconsistencies in pngconf.h that prevented compiling with
209 PNG_READ_GAMMA_SUPPORTED and PNG_READ_hIST_SUPPORTED undefined
210 fixed some typos and made other minor rearrangement of libpng.txt (Andreas)
211 changed recommendation about file_gamma for PC images to .50 from .51 in
212 example.c and libpng.txt, and changed file_gamma for sRGB images to .45
213 added a number of functions to access information from the png structure
214 png_get_image_height(), etc. (Glenn R-P, suggestion by Brad Pettit)
215 added TARGET_MACOS similar to zlib-1.0.8
216 define PNG_ALWAYS_EXTERN when __MWERKS__ && WIN32 are defined
217 added type casting to all png_malloc() function calls
218 version 0.99a [January 31, 1998]
219 Added type casts and parentheses to all returns that return a value.(Tim W.)
220 version 0.99b [February 4, 1998]
221 Added type cast png_uint_32 on malloc function calls where needed.
222 Changed type of num_hist from png_uint_32 to int (same as num_palette).
223 Added checks for rowbytes overflow, in case png_size_t is less than 32 bits.
224 Renamed makefile.elf to makefile.lnx.
225 version 0.99c [February 7, 1998]
226 More type casting. Removed erroneous overflow test in pngmem.c.
227 Added png_buffered_memcpy() and png_buffered_memset(), apply them to rowbytes.
228 Added UNIX manual pages libpng.3 (incorporating libpng.txt) and png.5.
229 version 0.99d [February 11, 1998]
230 Renamed "far_to_near()" "png_far_to_near()"
232 Version 99c "buffered" operations didn't work as intended. Replaced them
233 with png_memcpy_check() and png_memset_check().
234 Added many "if (png_ptr == NULL) return" to quell compiler warnings about
235 unused png_ptr, mostly in pngget.c and pngset.c.
236 Check for overlength tRNS chunk present when indexed-color PLTE is read.
237 Cleaned up spelling errors in libpng.3/libpng.txt
238 Corrected a problem with png_get_tRNS() which returned undefined trans array
239 version 0.99e [February 28, 1998]
240 Corrected png_get_tRNS() again.
241 Add parentheses for easier reading of pngget.c, fixed "||" should be "&&".
242 Touched up example.c to make more of it compileable, although the entire
243 file still can't be compiled (Willem van Schaik)
244 Fixed a bug in png_do_shift() (Bryan Tsai)
245 Added a space in png.h prototype for png_write_chunk_start()
246 Replaced pngtest.png with one created with zlib 1.1.1
247 Changed pngtest to report PASS even when file size is different (Jean-loup G.)
248 Corrected some logic errors in png_do_invert_alpha() (Chris Patterson)
249 version 0.99f [March 5, 1998]
250 Corrected a bug in pngpread() introduced in version 99c (Kevin Bracey)
251 Moved makefiles into a "scripts" directory, and added INSTALL instruction file
252 Added makefile.os2 and pngos2.def (A. Zabolotny) and makefile.s2x (W. Sebok)
253 Added pointers to "note on libpng versions" in makefile.lnx and README
254 Added row callback feature when reading and writing nonprogressive rows
255 and added a test of this feature in pngtest.c
256 Added user transform callbacks, with test of the feature in pngtest.c
257 version 0.99g [March 6, 1998, morning]
258 Minor changes to pngtest.c to suppress compiler warnings.
259 Removed "beta" language from documentation.
260 version 0.99h [March 6, 1998, evening]
261 Minor changes to previous minor changes to pngtest.c
262 Changed PNG_READ_NOT_FULLY_SUPPORTED to PNG_READ_TRANSFORMS_NOT_SUPPORTED
263 and added PNG_PROGRESSIVE_READ_NOT_SUPPORTED macro
264 Added user transform capability
265 version 1.00 [March 7, 1998]
266 Changed several typedefs in pngrutil.c
267 Added makefile.wat (Pawel Mrochen), updated makefile.tc3 (Willem van Schaik)
268 replaced "while(1)" with "for(;;)"
269 added PNGARG() to prototypes in pngtest.c and removed some prototypes
270 updated some of the makefiles (Tom Lane)
271 changed some typedefs (s_start, etc.) in pngrutil.c
272 fixed dimensions of "short_months" array in pngwrite.c
273 Replaced ansi2knr.c with the one from jpeg-v6
274 version 1.0.0 [March 8, 1998]
275 Changed name from 1.00 to 1.0.0 (Adam Costello)
276 Added smakefile.ppc (with SCOPTIONS.ppc) for Amiga PPC (Andreas Kleinert)
277 version 1.0.0a [March 9, 1998]
278 Fixed three bugs in pngrtran.c to make gamma+background handling consistent
280 Changed format of the PNG_LIBPNG_VER integer to xyyzz instead of xyz
281 for major, minor, and bugfix releases. This is 10001. (Adam Costello,
283 Make months range from 1-12 in png_convert_to_rfc1123
284 version 1.0.0b [March 13, 1998]
285 Quieted compiler complaints about two empty "for" loops in pngrutil.c
286 Minor changes to makefile.s2x
287 Removed #ifdef/#endif around a png_free() in pngread.c
288 version 1.0.1 [March 14, 1998]
289 Changed makefile.s2x to reduce security risk of using a relative pathname
290 Fixed some typos in the documentation (Greg).
291 Fixed a problem with value of "channels" returned by png_read_update_info()
292 version 1.0.1a [April 21, 1998]
293 Optimized Paeth calculations by replacing abs() function calls with intrinsics
294 plus other loop optimizations. Improves avg decoding speed by about 20%.
295 Commented out i386istic "align" compiler flags in makefile.lnx.
296 Reduced the default warning level in some makefiles, to make them consistent.
297 Removed references to IJG and JPEG in the ansi2knr.c copyright statement.
298 Fixed a bug in png_do_strip_filler with XXRRGGBB => RRGGBB transformation.
299 Added grayscale and 16-bit capability to png_do_read_filler().
300 Fixed a bug in pngset.c, introduced in version 0.99c, that sets rowbytes
301 too large when writing an image with bit_depth < 8 (Bob Dellaca).
302 Corrected some bugs in the experimental weighted filtering heuristics.
303 Moved a misplaced pngrutil code block that truncates tRNS if it has more
304 than num_palette entries -- test was done before num_palette was defined.
305 Fixed a png_convert_to_rfc1123() bug that converts day 31 to 0 (Steve Eddins).
306 Changed compiler flags in makefile.wat for better optimization (Pawel Mrochen).
307 version 1.0.1b [May 2, 1998]
308 Relocated png_do_gray_to_rgb() within png_do_read_transformations() (Greg).
309 Relocated the png_composite macros from pngrtran.c to png.h (Greg).
310 Added makefile.sco (contributed by Mike Hopkirk).
311 Fixed two bugs (missing definitions of "istop") introduced in libpng-1.0.1a.
312 Fixed a bug in pngrtran.c that would set channels=5 under some circumstances.
313 More work on the Paeth-filtering, achieving imperceptible speedup (A Kleinert).
314 More work on loop optimization which may help when compiled with C++ compilers.
315 Added warnings when people try to use transforms they've defined out.
316 Collapsed 4 "i" and "c" loops into single "i" loops in pngrtran and pngwtran.
317 Revised paragraph about png_set_expand() in libpng.txt and libpng.3 (Greg)
318 version 1.0.1c [May 11, 1998]
319 Fixed a bug in pngrtran.c (introduced in libpng-1.0.1a) where the masks for
320 filler bytes should have been 0xff instead of 0xf.
321 Added max_pixel_depth=32 in pngrutil.c when using FILLER with palette images.
322 Moved PNG_WRITE_WEIGHTED_FILTER_SUPPORTED and PNG_WRITE_FLUSH_SUPPORTED
323 out of the PNG_WRITE_TRANSFORMS_NOT_SUPPORTED block of pngconf.h
324 Added "PNG_NO_WRITE_TRANSFORMS" etc., as alternatives for *_NOT_SUPPORTED,
325 for consistency, in pngconf.h
326 Added individual "ifndef PNG_NO_[CAPABILITY]" in pngconf.h to make it easier
327 to remove unwanted capabilities via the compile line
328 Made some corrections to grammar (which, it's) in documentation (Greg).
329 Corrected example.c, use of row_pointers in png_write_image().
330 version 1.0.1d [May 24, 1998]
331 Corrected several statements that used side effects illegally in pngrutil.c
332 and pngtrans.c, that were introduced in version 1.0.1b
333 Revised png_read_rows() to avoid repeated if-testing for NULL (A Kleinert)
334 More corrections to example.c, use of row_pointers in png_write_image()
336 Added pngdll.mak and pngdef.pas to scripts directory, contributed by
337 Bob Dellaca, to make a png32bd.dll with Borland C++ 4.5
338 Fixed error in example.c with png_set_text: num_text is 3, not 2 (Guido V.)
339 Changed several loops from count-down to count-up, for consistency.
340 version 1.0.1e [June 6, 1998]
341 Revised libpng.txt and libpng.3 description of png_set_read|write_fn(), and
342 added warnings when people try to set png_read_fn and png_write_fn in
344 Added a test such that png_do_gamma will be done when num_trans==0
345 for truecolor images that have defined a background. This corrects an
346 error that was introduced in libpng-0.90 that can cause gamma processing
348 Added tests in png.h to include "trans" and "trans_values" in structures
349 when PNG_READ_BACKGROUND_SUPPORTED or PNG_READ_EXPAND_SUPPORTED is defined.
350 Add png_free(png_ptr->time_buffer) in png_destroy_read_struct()
351 Moved png_convert_to_rfc_1123() from pngwrite.c to png.c
352 Added capability for user-provided malloc_fn() and free_fn() functions,
353 and revised pngtest.c to demonstrate their use, replacing the
354 PNGTEST_DEBUG_MEM feature.
355 Added makefile.w32, for Microsoft C++ 4.0 and later (Tim Wegner).
356 version 1.0.2 [June 14, 1998]
357 Fixed two bugs in makefile.bor .
358 version 1.0.2a [December 30, 1998]
359 Replaced and extended code that was removed from png_set_filler() in 1.0.1a.
360 Fixed a bug in png_do_filler() that made it fail to write filler bytes in
361 the left-most pixel of each row (Kevin Bracey).
362 Changed "static pngcharp tIME_string" to "static char tIME_string[30]"
363 in pngtest.c (Duncan Simpson).
364 Fixed a bug in pngtest.c that caused pngtest to try to write a tIME chunk
365 even when no tIME chunk was present in the source file.
366 Fixed a problem in pngrutil.c: gray_to_rgb didn't always work with 16-bit.
367 Fixed a problem in png_read_push_finish_row(), which would not skip some
368 passes that it should skip, for images that are less than 3 pixels high.
369 Interchanged the order of calls to png_do_swap() and png_do_shift()
370 in pngwtran.c (John Cromer).
371 Added #ifdef PNG_DEBUG/#endif surrounding use of PNG_DEBUG in png.h .
372 Changed "bad adaptive filter type" from error to warning in pngrutil.c .
373 Fixed a documentation error about default filtering with 8-bit indexed-color.
374 Separated the PNG_NO_STDIO macro into PNG_NO_STDIO and PNG_NO_CONSOLE_IO
376 Added png_set_rgb_to_gray() and png_get_rgb_to_gray_status() functions.
377 Added png_get_copyright() and png_get_header_version() functions.
378 Revised comments on png_set_progressive_read_fn() in libpng.txt and example.c
379 Added information about debugging in libpng.txt and libpng.3 .
380 Changed "ln -sf" to "ln -s -f" in makefile.s2x, makefile.lnx, and makefile.sco.
381 Removed lines after Dynamic Dependencies" in makefile.aco .
382 Revised makefile.dec to make a shared library (Jeremie Petit).
383 Removed trailing blanks from all files.
384 version 1.0.2a [January 6, 1999]
385 Removed misplaced #endif and #ifdef PNG_NO_EXTERN near the end of png.h
386 Added "if" tests to silence complaints about unused png_ptr in png.h and png.c
387 Changed "check_if_png" function in example.c to return true (nonzero) if PNG.
388 Changed libpng.txt to demonstrate png_sig_cmp() instead of png_check_sig()
390 version 1.0.3 [January 14, 1999]
391 Added makefile.hux, for Hewlett Packard HPUX 10.20 and 11.00 (Jim Rice)
392 Added a statement of Y2K compliance in png.h, libpng.3, and Y2KINFO.
393 version 1.0.3a [August 12, 1999]
394 Added check for PNG_READ_INTERLACE_SUPPORTED in pngread.c; issue a warning
395 if an attempt is made to read an interlaced image when it's not supported.
396 Added check if png_ptr->trans is defined before freeing it in pngread.c
397 Modified the Y2K statement to include versions back to version 0.71
398 Fixed a bug in the check for valid IHDR bit_depth/color_types in pngrutil.c
399 Modified makefile.wat (added -zp8 flag, ".symbolic", changed some comments)
400 Replaced leading blanks with tab characters in makefile.hux
401 Changed "dworkin.wustl.edu" to "ccrc.wustl.edu" in various documents.
402 Changed (float)red and (float)green to (double)red, (double)green
403 in png_set_rgb_to_gray() to avoid "promotion" problems in AIX.
404 Fixed a bug in pngconf.h that omitted <stdio.h> when PNG_DEBUG==0 (K Bracey).
405 Reformatted libpng.3 and libpngpf.3 with proper fonts (script by J. vanZandt).
406 Updated documentation to refer to the PNG-1.2 specification.
407 Removed ansi2knr.c and left pointers to the latest source for ansi2knr.c
408 in makefile.knr, INSTALL, and README (L. Peter Deutsch)
409 Fixed bugs in calculation of the length of rowbytes when adding alpha
410 channels to 16-bit images, in pngrtran.c (Chris Nokleberg)
411 Added function png_set_user_transform_info() to store user_transform_ptr,
412 user_depth, and user_channels into the png_struct, and a function
413 png_get_user_transform_ptr() to retrieve the pointer (Chris Nokleberg)
414 Added function png_set_empty_plte_permitted() to make libpng useable
416 Corrected the typedef for png_free_ptr in png.h (Jesse Jones).
417 Correct gamma with srgb is 45455 instead of 45000 in pngrutil.c, to be
418 consistent with PNG-1.2, and allow variance of 500 before complaining.
419 Added assembler code contributed by Intel in file pngvcrd.c and modified
420 makefile.w32 to use it (Nirav Chhatrapati, INTEL Corporation, Gilles Vollant)
421 Changed "ln -s -f" to "ln -f -s" in the makefiles to make Solaris happy.
422 Added some aliases for png_set_expand() in pngrtran.c, namely
423 png_set_expand_PLTE(), png_set_expand_depth(), and png_set_expand_tRNS()
424 (Greg Roelofs, in "PNG: The Definitive Guide").
425 Added makefile.beo for BEOS on X86, contributed by Sander Stok.
426 version 1.0.3b [August 26, 1999]
427 Replaced 2147483647L several places with PNG_MAX_UINT macro, defined in png.h
428 Changed leading blanks to tabs in all makefiles.
429 Define PNG_USE_PNGVCRD in makefile.w32, to get MMX assembler code.
430 Made alternate versions of png_set_expand() in pngrtran.c, namely
431 png_set_gray_1_2_4_to_8, png_set_palette_to_rgb, and png_set_tRNS_to_alpha
432 (Greg Roelofs, in "PNG: The Definitive Guide"). Deleted the 1.0.3a aliases.
433 Relocated start of 'extern "C"' block in png.h so it doesn't include pngconf.h
434 Revised calculation of num_blocks in pngmem.c to avoid a potentially
435 negative shift distance, whose results are undefined in the C language.
436 Added a check in pngset.c to prevent writing multiple tIME chunks.
437 Added a check in pngwrite.c to detect invalid small window_bits sizes.
438 version 1.0.3d [September 4, 1999]
439 Fixed type casting of igamma in pngrutil.c
440 Added new png_expand functions to scripts/pngdef.pas and pngos2.def
441 Added a demo read_user_transform_fn that examines the row filters in pngtest.c
442 version 1.0.4 [September 24, 1999]
443 Define PNG_ALWAYS_EXTERN in pngconf.h if __STDC__ is defined
444 Delete #define PNG_INTERNAL and include "png.h" from pngasmrd.h
445 Made several minor corrections to pngtest.c
446 Renamed the makefiles with longer but more user friendly extensions.
447 Copied the PNG copyright and license to a separate LICENSE file.
448 Revised documentation, png.h, and example.c to remove reference to
449 "viewing_gamma" which no longer appears in the PNG specification.
450 Revised pngvcrd.c to use MMX code for interlacing only on the final pass.
451 Updated pngvcrd.c to use the faster C filter algorithms from libpng-1.0.1a
452 Split makefile.win32vc into two versions, makefile.vcawin32 (uses MMX
453 assembler code) and makefile.vcwin32 (doesn't).
454 Added a CPU timing report to pngtest.c (enabled by defining PNGTEST_TIMING)
455 Added a copy of pngnow.png to the distribution.
456 version 1.0.4a [September 25, 1999]
457 Increase max_pixel_depth in pngrutil.c if a user transform needs it.
458 Changed several division operations to right-shifts in pngvcrd.c
459 version 1.0.4b [September 30, 1999]
460 Added parentheses in line 3732 of pngvcrd.c
461 Added a comment in makefile.linux warning about buggy -O3 in pgcc 2.95.1
462 version 1.0.4c [October 1, 1999]
463 Added a "png_check_version" function in png.c and pngtest.c that will generate
464 a helpful compiler error if an old png.h is found in the search path.
465 Changed type of png_user_transform_depth|channels from int to png_byte.
466 version 1.0.4d [October 6, 1999]
467 Changed 0.45 to 0.45455 in png_set_sRGB()
468 Removed unused PLTE entries from pngnow.png
469 Re-enabled some parts of pngvcrd.c (png_combine_row) that work properly.
470 version 1.0.4e [October 10, 1999]
471 Fixed sign error in pngvcrd.c (Greg Roelofs)
472 Replaced some instances of memcpy with simple assignments in pngvcrd (GR-P)
473 version 1.0.4f [October 15, 1999]
474 Surrounded example.c code with #if 0 .. #endif to prevent people from
475 inadvertently trying to compile it.
476 Changed png_get_header_version() from a function to a macro in png.h
477 Added type casting mostly in pngrtran.c and pngwtran.c
478 Removed some pointless "ptr = NULL" in pngmem.c
479 Added a "contrib" directory containing the source code from Greg's book.
480 version 1.0.5 [October 15, 1999]
481 Minor editing of the INSTALL and README files.
482 version 1.0.5a [October 23, 1999]
483 Added contrib/pngsuite and contrib/pngminus (Willem van Schaik)
484 Fixed a typo in the png_set_sRGB() function call in example.c (Jan Nijtmans)
485 Further optimization and bugfix of pngvcrd.c
486 Revised pngset.c so that it does not allocate or free memory in the user's
487 text_ptr structure. Instead, it makes its own copy.
488 Created separate write_end_info_struct in pngtest.c for a more severe test.
489 Added code in pngwrite.c to free info_ptr->text[i].key to stop a memory leak.
490 version 1.0.5b [November 23, 1999]
491 Moved PNG_FLAG_HAVE_CHUNK_HEADER, PNG_FLAG_BACKGROUND_IS_GRAY and
492 PNG_FLAG_WROTE_tIME from flags to mode.
493 Added png_write_info_before_PLTE() function.
494 Fixed some typecasting in contrib/gregbook/*.c
495 Updated scripts/makevms.com and added makevms.com to contrib/gregbook
496 and contrib/pngminus (Martin Zinser)
497 version 1.0.5c [November 26, 1999]
498 Moved png_get_header_version from png.h to png.c, to accomodate ansi2knr.
499 Removed all global arrays (according to PNG_NO_GLOBAL_ARRAYS macro), to
500 accomodate making DLL's: Moved usr_png_ver from global variable to function
501 png_get_header_ver() in png.c. Moved png_sig to png_sig_bytes in png.c and
502 eliminated use of png_sig in pngwutil.c. Moved the various png_CHNK arrays
503 into pngtypes.h. Eliminated use of global png_pass arrays. Declared the
504 png_CHNK and png_pass arrays to be "const". Made the global arrays
505 available to applications (although none are used in libpng itself) when
506 PNG_NO_GLOBAL_ARRAYS is not defined or when PNG_GLOBAL_ARRAYS is defined.
507 Removed some extraneous "-I" from contrib/pngminus/makefile.std
508 Changed the PNG_sRGB_INTENT macros in png.h to be consistent with PNG-1.2.
509 Change PNG_SRGB_INTENT to PNG_sRGB_INTENT in libpng.txt and libpng.3
510 version 1.0.5d [November 29, 1999]
511 Add type cast (png_const_charp) two places in png.c
512 Eliminated pngtypes.h; use macros instead to declare PNG_CHNK arrays.
513 Renamed "PNG_GLOBAL_ARRAYS" to "PNG_USE_GLOBAL_ARRAYS" and made available
514 to applications a macro "PNG_USE_LOCAL_ARRAYS".
515 #ifdef out all the new declarations when PNG_USE_GLOBAL_ARRAYS is defined.
516 Added PNG_EXPORT_VAR macro to accommodate making DLL's.
517 version 1.0.5e [November 30, 1999]
518 Added iCCP, iTXt, and sPLT support; added "lang" member to the png_text
519 structure; refactored the inflate/deflate support to make adding new chunks
520 with trailing compressed parts easier in the future, and added new functions
521 png_free_iCCP, png_free_pCAL, png_free_sPLT, png_free_text, png_get_iCCP,
522 png_get_spalettes, png_set_iCCP, png_set_spalettes (Eric S. Raymond).
523 NOTE: Applications that write text chunks MUST define png_text->lang
524 before calling png_set_text(). It must be set to NULL if you want to
525 write tEXt or zTXt chunks. If you want your application to be able to
526 run with older versions of libpng, use
528 #ifdef PNG_iTXt_SUPPORTED
529 png_text[i].lang = NULL;
532 Changed png_get_oFFs() and png_set_oFFs() to use signed rather than unsigned
533 offsets (Eric S. Raymond).
534 Combined PNG_READ_cHNK_SUPPORTED and PNG_WRITE_cHNK_SUPPORTED macros into
535 PNG_cHNK_SUPPORTED and combined the three types of PNG_text_SUPPORTED
536 macros, leaving the separate macros also available.
537 Removed comments on #endifs at the end of many short, non-nested #if-blocks.
538 version 1.0.5f [December 6, 1999]
539 Changed makefile.solaris to issue a warning about potential problems when
540 the ucb "ld" is in the path ahead of the ccs "ld".
541 Removed "- [date]" from the "synopsis" line in libpng.3 and libpngpf.3.
542 Added sCAL chunk support (Eric S. Raymond).
543 version 1.0.5g [December 7, 1999]
544 Fixed "png_free_spallettes" typo in png.h
545 Added code to handle new chunks in pngpread.c
546 Moved PNG_CHNK string macro definitions outside of PNG_NO_EXTERN block
547 Added "translated_key" to png_text structure and png_write_iTXt().
548 Added code in pngwrite.c to work around a newly discovered zlib bug.
549 version 1.0.5h [December 10, 1999]
550 NOTE: regarding the note for version 1.0.5e, the following must also
551 be included in your code:
552 png_text[i].translated_key = NULL;
553 Unknown chunk handling is now supported.
554 Option to eliminate all floating point support was added. Some new
555 fixed-point functions such as png_set_gAMA_fixed() were added.
556 Expanded tabs and removed trailing blanks in source files.
557 version 1.0.5i [December 13, 1999]
558 Added some type casts to silence compiler warnings.
559 Renamed "png_free_spalette" to "png_free_spalettes" for consistency.
560 Removed leading blanks from a #define in pngvcrd.c
561 Added some parameters to the new png_set_keep_unknown_chunks() function.
562 Added a test for up->location != 0 in the first instance of writing
563 unknown chunks in pngwrite.c
564 Changed "num" to "i" in png_free_spalettes() and png_free_unknowns() to
566 Added png_free_hIST() function.
567 Various patches to fix bugs in the sCAL and integer cHRM processing,
568 and to add some convenience macros for use with sCAL.
569 version 1.0.5j [December 21, 1999]
570 Changed "unit" parameter of png_write_sCAL from png_byte to int, to work
571 around buggy compilers.
572 Added new type "png_fixed_point" for integers that hold float*100000 values
573 Restored backward compatibility of tEXt/zTXt chunk processing:
574 Restored the first four members of png_text to the same order as v.1.0.5d.
575 Added members "lang_key" and "itxt_length" to png_text struct. Set
576 text_length=0 when "text" contains iTXt data. Use the "compression"
577 member to distinguish among tEXt/zTXt/iTXt types. Added
578 PNG_ITXT_COMPRESSION_NONE (1) and PNG_ITXT_COMPRESSION_zTXt(2) macros.
579 The "Note" above, about backward incompatibility of libpng-1.0.5e, no
581 Fixed png_read|write_iTXt() to read|write parameters in the right order,
582 and to write the iTXt chunk after IDAT if it appears in the end_ptr.
583 Added pnggccrd.c, version of pngvcrd.c Intel assembler for gcc (Greg Roelofs)
584 Reversed the order of trying to write floating-point and fixed-point gAMA.
585 version 1.0.5k [December 27, 1999]
586 Added many parentheses, e.g., "if (a && b & c)" becomes "if (a && (b & c))"
587 Added png_handle_as_unknown() function (Glenn)
588 Added png_free_chunk_list() function and chunk_list and num_chunk_list members
590 Eliminated erroneous warnings about multiple sPLT chunks and sPLT-after-PLTE.
591 Fixed a libpng-1.0.5h bug in pngrutil.c that was issuing erroneous warnings
592 about ignoring incorrect gAMA with sRGB (gAMA was in fact not ignored)
593 Added png_free_tRNS(); png_set_tRNS() now malloc's its own trans array (ESR).
594 Define png_get_int_32 when oFFs chunk is supported as well as when pCAL is.
595 Changed type of proflen from png_int_32 to png_uint_32 in png_get_iCCP().
596 version 1.0.5l [January 1, 2000]
597 Added functions png_set_read_user_chunk_fn() and png_get_user_chunk_ptr()
598 for setting a callback function to handle unknown chunks and for
599 retrieving the associated user pointer (Glenn).
600 version 1.0.5m [January 7, 2000]
601 Added high-level functions png_read_png(), png_write_png(), png_free_pixels().
602 version 1.0.5n [January 9, 2000]
603 Added png_free_PLTE() function, and modified png_set_PLTE() to malloc its
604 own memory for info_ptr->palette. This makes it safe for the calling
605 application to free its copy of the palette any time after it calls
607 version 1.0.5o [January 20, 2000]
608 Cosmetic changes only (removed some trailing blanks and TABs)
609 version 1.0.5p [January 31, 2000]
610 Renamed pngdll.mak to makefile.bd32
611 Cosmetic changes in pngtest.c
612 version 1.0.5q [February 5, 2000]
613 Relocated the makefile.solaris warning about PATH problems.
614 Fixed pngvcrd.c bug by pushing/popping registers in mmxsupport (Bruce Oberg)
615 Revised makefile.gcmmx
616 Added PNG_SETJMP_SUPPORTED, PNG_SETJMP_NOT_SUPPORTED, and PNG_ABORT() macros
617 version 1.0.5r [February 7, 2000]
618 Removed superfluous prototype for png_get_itxt from png.h
619 Fixed a bug in pngrtran.c that improperly expanded the background color.
620 Return *num_text=0 from png_get_text() when appropriate, and fix documentation
621 of png_get_text() in libpng.txt/libpng.3.
622 version 1.0.5s [February 18, 2000]
623 Added "png_jmp_env()" macro to pngconf.h, to help people migrate to the
624 new error handler that's planned for the next libpng release, and changed
625 example.c, pngtest.c, and contrib programs to use this macro.
626 Revised some of the DLL-export macros in pngconf.h (Greg Roelofs)
627 Fixed a bug in png_read_png() that caused it to fail to expand some images
628 that it should have expanded.
629 Fixed some mistakes in the unused and undocumented INCH_CONVERSIONS functions
631 Changed the allocation of palette, history, and trans arrays back to
632 the version 1.0.5 method (linking instead of copying) which restores
633 backward compatibility with version 1.0.5. Added some remarks about
634 that in example.c. Added "free_me" member to info_ptr and png_ptr
635 and added png_free_data() function.
636 Updated makefile.linux and makefile.gccmmx to make directories conditionally.
637 Made cosmetic changes to pngasmrd.h
638 Added png_set_rows() and png_get_rows(), for use with png_read|write_png().
639 Modified png_read_png() to allocate info_ptr->row_pointers only if it
640 hasn't already been allocated.
641 version 1.0.5t [March 4, 2000]
642 Changed png_jmp_env() migration aiding macro to png_jmpbuf().
643 Fixed "interlace" typo (should be "interlaced") in contrib/gregbook/read2-x.c
644 Fixed bug with use of PNG_BEFORE_IHDR bit in png_ptr->mode, introduced when
645 PNG_FLAG_HAVE_CHUNK_HEADER was moved into png_ptr->mode in version 1.0.5b
646 Files in contrib/gregbook were revised to use png_jmpbuf() and to select
647 a 24-bit visual if one is available, and to allow abbreviated options.
648 Files in contrib/pngminus were revised to use the png_jmpbuf() macro.
649 Removed spaces in makefile.linux and makefile.gcmmx, introduced in 1.0.5s
650 version 1.0.5u [March 5, 2000]
651 Simplified the code that detects old png.h in png.c and pngtest.c
652 Renamed png_spalette (_p, _pp) to png_sPLT_t (_tp, _tpp)
653 Increased precision of rgb_to_gray calculations from 8 to 15 bits and
654 added png_set_rgb_to_gray_fixed() function.
655 Added makefile.bc32 (32-bit Borland C++, C mode)
656 version 1.0.5v [March 11, 2000]
657 Added some parentheses to the png_jmpbuf macro definition.
658 Updated references to the zlib home page, which has moved to freesoftware.com.
659 Corrected bugs in documentation regarding png_read_row() and png_write_row().
660 Updated documentation of png_rgb_to_gray calculations in libpng.3/libpng.txt.
661 Renamed makefile.borland,turboc3 back to makefile.bor,tc3 as in version 1.0.3,
662 revised borland makefiles; added makefile.ibmvac3 and makefile.gcc (Cosmin)
663 version 1.0.6 [March 20, 2000]
664 Minor revisions of makefile.bor, libpng.txt, and gregbook/rpng2-win.c
665 Added makefile.sggcc (SGI IRIX with gcc)
666 version 1.0.6d [April 7, 2000]
667 Changed sprintf() to strcpy() in png_write_sCAL_s() to work without STDIO
668 Added data_length parameter to png_decompress_chunk() function
669 Revised documentation to remove reference to abandoned png_free_chnk functions
670 Fixed an error in png_rgb_to_gray_fixed()
671 Revised example.c, usage of png_destroy_write_struct().
672 Renamed makefile.ibmvac3 to makefile.ibmc, added libpng.icc IBM project file
673 Added a check for info_ptr->free_me&PNG_FREE_TEXT when freeing text in png.c
674 Simplify png_sig_bytes() function to remove use of non-ISO-C strdup().
675 version 1.0.6e [April 9, 2000]
676 Added png_data_freer() function.
677 In the code that checks for over-length tRNS chunks, added check of
678 info_ptr->num_trans as well as png_ptr->num_trans (Matthias Benckmann)
679 Minor revisions of libpng.txt/libpng.3.
680 Check for existing data and free it if the free_me flag is set, in png_set_*()
682 Only define PNG_WEIGHTED_FILTERS_SUPPORTED when PNG_FLOATING_POINT_SUPPORTED
684 Changed several instances of PNG_NO_CONSOLE_ID to PNG_NO_STDIO in pngrutil.c
685 and mentioned the purposes of the two macros in libpng.txt/libpng.3.
686 version 1.0.6f [April 14, 2000]
687 Revised png_set_iCCP() and png_set_rows() to avoid prematurely freeing data.
688 Add checks in png_set_text() for NULL members of the input text structure.
689 Revised libpng.txt/libpng.3.
690 Removed superfluous prototype for png_set_itxt from png.h
691 Removed "else" from pngread.c, after png_error(), and changed "0" to "length".
692 Changed several png_errors about malformed ancillary chunks to png_warnings.
693 version 1.0.6g [April 24, 2000]
694 Added png_pass-* arrays to pnggccrd.c when PNG_USE_LOCAL_ARRAYS is defined.
695 Relocated paragraph about png_set_background() in libpng.3/libpng.txt
696 and other revisions (Matthias Benckmann)
697 Relocated info_ptr->free_me, png_ptr->free_me, and other info_ptr and
698 png_ptr members to restore binary compatibility with libpng-1.0.5
699 (breaks compatibility with libpng-1.0.6).
700 version 1.0.6h [April 24, 2000]
701 Changed shared library so-number pattern from 2.x.y.z to xy.z (this builds
702 libpng.so.10 & libpng.so.10.6h instead of libpng.so.2 & libpng.so.2.1.0.6h)
703 This is a temporary change for test purposes.
704 version 1.0.6i [May 2, 2000]
705 Rearranged some members at the end of png_info and png_struct, to put
706 unknown_chunks_num and free_me within the original size of the png_structs
707 and free_me, png_read_user_fn, and png_free_fn within the original png_info,
708 because some old applications allocate the structs directly instead of
709 using png_create_*().
710 Added documentation of user memory functions in libpng.txt/libpng.3
711 Modified png_read_png so that it will use user_allocated row_pointers
712 if present, unless free_me directs that it be freed, and added description
713 of the use of png_set_rows() and png_get_rows() in libpng.txt/libpng.3.
714 Added PNG_LEGACY_SUPPORTED macro, and #ifdef out all new (since version
715 1.00) members of png_struct and png_info, to regain binary compatibility
716 when you define this macro. Capabilities lost in this event
717 are user transforms (new in version 1.0.0),the user transform pointer
718 (new in version 1.0.2), rgb_to_gray (new in 1.0.5), iCCP, sCAL, sPLT,
719 the high-level interface, and unknown chunks support (all new in 1.0.6).
720 This was necessary because of old applications that allocate the structs
721 directly as authors were instructed to do in libpng-0.88 and earlier,
722 instead of using png_create_*().
723 Added modes PNG_CREATED_READ_STRUCT and PNG_CREATED_WRITE_STRUCT which
724 can be used to detect codes that directly allocate the structs, and
725 code to check these modes in png_read_init() and png_write_init() and
726 generate a libpng error if the modes aren't set and PNG_LEGACY_SUPPORTED
728 Added makefile.intel and updated makefile.watcom (Pawel Mrochen)
729 version 1.0.6j [May 3, 2000]
730 Overloaded png_read_init() and png_write_init() with macros that convert
731 calls to png_read_init_2() or png_write_init_2() that check the version
733 version 1.0.7beta11 [May 7, 2000]
734 Removed the new PNG_CREATED_READ_STRUCT and PNG_CREATED_WRITE_STRUCT modes
735 which are no longer used.
736 Eliminated the three new members of png_text when PNG_LEGACY_SUPPORTED is
737 defined or when neither PNG_READ_iTXt_SUPPORTED nor PNG_WRITE_iTXT_SUPPORTED
739 Made PNG_NO_READ|WRITE_iTXt the default setting, to avoid memory
740 overrun when old applications fill the info_ptr->text structure directly.
741 Added PNGAPI macro, and added it to the definitions of all exported functions.
742 Relocated version macro definitions ahead of the includes of zlib.h and
744 version 1.0.7beta12 [May 12, 2000]
745 Revised pngset.c to avoid a problem with expanding the png_debug macro.
746 Deleted some extraneous defines from pngconf.h
747 Made PNG_NO_CONSOLE_IO the default condition when PNG_BUILD_DLL is defined.
748 Use MSC _RPTn debugging instead of fprintf if _MSC_VER is defined.
749 Added png_access_version_number() function.
750 Check for mask&PNG_FREE_CHNK (for TEXT, SCAL, PCAL) in png_free_data().
751 Expanded libpng.3/libpng.txt information about png_data_freer().
752 version 1.0.7beta14 [May 17, 2000] (beta13 was not published)
753 Changed pnggccrd.c and pngvcrd.c to handle bad adaptive filter types as
754 warnings instead of errors, as pngrutil.c does.
755 Set the PNG_INFO_IDAT valid flag in png_set_rows() so png_write_png()
756 will actually write IDATs.
757 Made the default PNG_USE_LOCAL_ARRAYS depend on PNG_DLL instead of WIN32.
758 Make png_free_data() ignore its final parameter except when freeing data
759 that can have multiple instances (text, sPLT, unknowns).
760 Fixed a new bug in png_set_rows().
761 Removed info_ptr->valid tests from png_free_data(), as in version 1.0.5.
762 Added png_set_invalid() function.
763 Fixed incorrect illustrations of png_destroy_write_struct() in example.c.
764 version 1.0.7beta15 [May 30, 2000]
765 Revised the deliberately erroneous Linux setjmp code in pngconf.h to produce
766 fewer error messages.
767 Rearranged checks for Z_OK to check the most likely path first in pngpread.c
769 Added checks in pngtest.c for png_create_*() returning NULL, and mentioned
770 in libpng.txt/libpng.3 the need for applications to check this.
771 Changed names of png_default_*() functions in pngtest to pngtest_*().
772 Changed return type of png_get_x|y_offset_*() from png_uint_32 to png_int_32.
773 Fixed some bugs in the unused PNG_INCH_CONVERSIONS functions in pngget.c
774 Set each pointer to NULL after freeing it in png_free_data().
775 Worked around a problem in pngconf.h; AIX's strings.h defines an "index"
776 macro that conflicts with libpng's png_color_16.index. (Dimitri Papadapoulos)
777 Added "msvc" directory with MSVC++ project files (Simon-Pierre Cadieux).
778 version 1.0.7beta16 [June 4, 2000]
779 Revised the workaround of AIX string.h "index" bug.
780 Added a check for overlength PLTE chunk in pngrutil.c.
781 Added PNG_NO_POINTER_INDEXING macro to use array-indexing instead of pointer
782 indexing in pngrutil.c and pngwutil.c to accommodate a buggy compiler.
783 Added a warning in png_decompress_chunk() when it runs out of data, e.g.
784 when it tries to read an erroneous PhotoShop iCCP chunk.
785 Added PNG_USE_DLL macro.
786 Revised the copyright/disclaimer/license notice.
787 Added contrib/msvctest directory
788 version 1.0.7rc1 [June 9, 2000]
789 Corrected the definition of PNG_TRANSFORM_INVERT_ALPHA (0x0400 not 0x0200)
790 Added contrib/visupng directory (Willem van Schaik)
791 version 1.0.7beta18 [June 23, 2000]
792 Revised PNGAPI definition, and pngvcrd.c to work with __GCC__
793 and do not redefine PNGAPI if it is passed in via a compiler directive.
794 Revised visupng/PngFile.c to remove returns from within the Try block.
795 Removed leading underscores from "_PNG_H" and "_PNG_SAVE_BSD_SOURCE" macros.
796 Updated contrib/visupng/cexcept.h to version 1.0.0.
797 Fixed bugs in pngwrite.c and pngwutil.c that prevented writing iCCP chunks.
798 version 1.0.7rc2 [June 28, 2000]
799 Updated license to include disclaimers required by UCITA.
800 Fixed "DJBPP" typo in pnggccrd.c introduced in beta18.
801 version 1.0.7 [July 1, 2000]
802 Revised the definition of "trans_values" in libpng.3/libpng.txt
803 version 1.0.8beta1 [July 8, 2000]
804 Added png_free(png_ptr, key) two places in pngpread.c to stop memory leaks.
805 Changed PNG_NO_STDIO to PNG_NO_CONSOLE_IO, several places in pngrutil.c and
807 Changed PNG_EXPORT_VAR to use PNG_IMPEXP, in pngconf.h.
808 Removed unused "#include <assert.h>" from png.c
809 Added WindowsCE support.
810 Revised pnggccrd.c to work with gcc-2.95.2 and in the Cygwin environment.
811 version 1.0.8beta2 [July 10, 2000]
812 Added project files to the wince directory and made further revisions
813 of pngtest.c, pngrio.c, and pngwio.c in support of WindowsCE.
814 version 1.0.8beta3 [July 11, 2000]
815 Only set the PNG_FLAG_FREE_TRNS or PNG_FREE_TRNS flag in png_handle_tRNS()
816 for indexed-color input files to avoid potential double-freeing trans array
817 under some unusual conditions; problem was introduced in version 1.0.6f.
818 Further revisions to pngtest.c and files in the wince subdirectory.
819 version 1.0.8beta4 [July 14, 2000]
820 Added the files pngbar.png and pngbar.jpg to the distribution.
821 Added makefile.cygwin, and cygwin support in pngconf.h
822 Added PNG_NO_ZALLOC_ZERO macro (makes png_zalloc skip zeroing memory)
823 version 1.0.8rc1 [July 16, 2000]
824 Revised png_debug() macros and statements to eliminate compiler warnings.
825 version 1.0.8 [July 24, 2000]
826 Added png_flush() in pngwrite.c, after png_write_IEND().
827 Updated makefile.hpux to build a shared library.
828 version 1.0.9beta1 [November 10, 2000]
829 Fixed typo in scripts/makefile.hpux
830 Updated makevms.com in scripts and contrib/* and contrib/* (Martin Zinser)
831 Fixed seqence-point bug in contrib/pngminus/png2pnm (Martin Zinser)
832 Changed "cdrom.com" in documentation to "libpng.org"
833 Revised pnggccrd.c to get it all working, and updated makefile.gcmmx (Greg).
834 Changed type of "params" from voidp to png_voidp in png_read|write_png().
835 Make sure PNGAPI and PNG_IMPEXP are defined in pngconf.h.
836 Revised the 3 instances of WRITEFILE in pngtest.c.
837 Relocated "msvc" and "wince" project subdirectories into "dll" subdirectory.
838 Updated png.rc in dll/msvc project
839 Revised makefile.dec to define and use LIBPATH and INCPATH
840 Increased size of global png_libpng_ver[] array from 12 to 18 chars.
841 Made global png_libpng_ver[], png_sig[] and png_pass_*[] arrays const.
842 Removed duplicate png_crc_finish() from png_handle_bKGD() function.
843 Added a warning when application calls png_read_update_info() multiple times.
844 Revised makefile.cygwin
845 Fixed bugs in iCCP support in pngrutil.c and pngwutil.c.
846 Replaced png_set_empty_plte_permitted() with png_permit_mng_features().
847 version 1.0.9beta2 [November 19, 2000]
848 Renamed the "dll" subdirectory "projects".
849 Added borland project files to "projects" subdirectory.
850 Set VS_FF_PRERELEASE and VS_FF_PATCHED flags in msvc/png.rc when appropriate.
851 Add error message in png_set_compression_buffer_size() when malloc fails.
852 version 1.0.9beta3 [November 23, 2000]
853 Revised PNG_LIBPNG_BUILD_TYPE macro in png.h, used in the msvc project.
854 Removed the png_flush() in pngwrite.c that crashes some applications
855 that don't set png_output_flush_fn.
856 Added makefile.macosx and makefile.aix to scripts directory.
857 version 1.0.9beta4 [December 1, 2000]
858 Change png_chunk_warning to png_warning in png_check_keyword().
859 Increased the first part of msg buffer from 16 to 18 in png_chunk_error().
860 version 1.0.9beta5 [December 15, 2000]
861 Added support for filter method 64 (for PNG datastreams embedded in MNG).
862 version 1.0.9beta6 [December 18, 2000]
863 Revised png_set_filter() to accept filter method 64 when appropriate.
864 Added new PNG_HAVE_PNG_SIGNATURE bit to png_ptr->mode and use it to
865 help prevent applications from using MNG features in PNG datastreams.
866 Added png_permit_mng_features() function.
867 Revised libpng.3/libpng.txt. Changed "filter type" to "filter method".
868 version 1.0.9rc1 [December 23, 2000]
869 Revised test for PNG_HAVE_PNG_SIGNATURE in pngrutil.c
870 Fixed error handling of unknown compression type in png_decompress_chunk().
871 In pngconf.h, define __cdecl when _MSC_VER is defined.
872 version 1.0.9beta7 [December 28, 2000]
873 Changed PNG_TEXT_COMPRESSION_zTXt to PNG_COMPRESSION_TYPE_BASE several places.
874 Revised memory management in png_set_hIST and png_handle_hIST in a backward
875 compatible manner. PLTE and tRNS were revised similarly.
876 Revised the iCCP chunk reader to ignore trailing garbage.
877 version 1.0.9beta8 [January 12, 2001]
878 Moved pngasmrd.h into pngconf.h.
879 Improved handling of out-of-spec garbage iCCP chunks generated by PhotoShop.
880 version 1.0.9beta9 [January 15, 2001]
881 Added png_set_invalid, png_permit_mng_features, and png_mmx_supported to
882 wince and msvc project module definition files.
883 Minor revision of makefile.cygwin.
884 Fixed bug with progressive reading of narrow interlaced images in pngpread.c
885 version 1.0.9beta10 [January 16, 2001]
886 Do not typedef png_FILE_p in pngconf.h when PNG_NO_STDIO is defined.
887 Fixed "png_mmx_supported" typo in project definition files.
888 version 1.0.9beta11 [January 19, 2001]
889 Updated makefile.sgi to make shared library.
890 Removed png_mmx_support() function and disabled PNG_MNG_FEATURES_SUPPORTED
891 by default, for the benefit of DLL forward compatibility. These will
892 be re-enabled in version 1.2.0.
893 version 1.0.9rc2 [January 22, 2001]
894 Revised cygwin support.
895 version 1.0.9 [January 31, 2001]
896 Added check of cygwin's ALL_STATIC in pngconf.h
897 Added "-nommx" parameter to contrib/gregbook/rpng2-win and rpng2-x demos.
898 version 1.0.10beta1 [March 14, 2001]
899 Revised makefile.dec, makefile.sgi, and makefile.sggcc; added makefile.hpgcc.
900 Reformatted libpng.3 to eliminate bad line breaks.
901 Added checks for _mmx_supported in the read_filter_row function of pnggccrd.c
902 Added prototype for png_mmx_support() near the top of pnggccrd.c
903 Moved some error checking from png_handle_IHDR to png_set_IHDR.
904 Added PNG_NO_READ_SUPPORTED and PNG_NO_WRITE_SUPPORTED macros.
905 Revised png_mmx_support() function in pnggccrd.c
906 Restored version 1.0.8 PNG_WRITE_EMPTY_PLTE_SUPPORTED behavior in pngwutil.c
907 Fixed memory leak in contrib/visupng/PngFile.c
908 Fixed bugs in png_combine_row() in pnggccrd.c and pngvcrd.c (C version)
909 Added warnings when retrieving or setting gamma=0.
910 Increased the first part of msg buffer from 16 to 18 in png_chunk_warning().
911 version 1.0.10rc1 [March 23, 2001]
912 Changed all instances of memcpy, strcpy, and strlen to png_memcpy, png_strcpy,
914 Revised png_mmx_supported() function in pnggccrd.c to return proper value.
915 Fixed bug in progressive reading (pngpread.c) with small images (height < 8).
916 version 1.0.10 [March 30, 2001]
917 Deleted extraneous space (introduced in 1.0.9) from line 42 of makefile.cygwin
918 Added beos project files (Chris Herborth)
919 version 1.0.11beta1 [April 3, 2001]
920 Added type casts on several png_malloc() calls (Dimitri Papadapoulos).
921 Removed a no-longer needed AIX work-around from pngconf.h
922 Changed several "//" single-line comments to C-style in pnggccrd.c
923 version 1.0.11beta2 [April 11, 2001]
924 Removed PNGAPI from several functions whose prototypes did not have PNGAPI.
925 Updated scripts/pngos2.def
926 version 1.0.11beta3 [April 14, 2001]
927 Added checking the results of many instances of png_malloc() for NULL
928 version 1.0.11beta4 [April 20, 2001]
929 Undid the changes from version 1.0.11beta3. Added a check for NULL return
930 from user's malloc_fn().
931 Removed some useless type casts of the NULL pointer.
932 Added makefile.netbsd
933 version 1.0.11 [April 27, 2001]
934 Revised makefile.netbsd
935 version 1.0.12beta1 [May 14, 2001]
936 Test for Windows platform in pngconf.h when including malloc.h (Emmanuel Blot)
937 Updated makefile.cygwin and handling of Cygwin's ALL_STATIC in pngconf.h
938 Added some never-to-be-executed code in pnggccrd.c to quiet compiler warnings.
939 Eliminated the png_error about apps using png_read|write_init(). Instead,
940 libpng will reallocate the png_struct and info_struct if they are too small.
941 This retains future binary compatibility for old applications written for
942 libpng-0.88 and earlier.
943 version 1.2.0beta1 [May 6, 2001]
945 Re-enabled PNG_MNG_FEATURES_SUPPORTED and enabled PNG_ASSEMBLER_CODE_SUPPORTED
947 Added runtime selection of MMX features.
948 Added png_set_strip_error_numbers function and related macros.
949 version 1.2.0beta2 [May 7, 2001]
950 Finished merging 1.2.0beta1 with version 1.0.11
951 Added a check for attempts to read or write PLTE in grayscale PNG datastreams.
952 version 1.2.0beta3 [May 17, 2001]
953 Enabled user memory function by default.
954 Modified png_create_struct so it passes user mem_ptr to user memory allocator.
955 Increased png_mng_features flag from png_byte to png_uint_32.
956 Bumped shared-library (so-number) and dll-number to 3.
957 version 1.2.0beta4 [June 23, 2001]
958 Check for missing profile length field in iCCP chunk and free chunk_data
959 in case of truncated iCCP chunk.
960 Bumped shared-library number to 3 in makefile.sgi and makefile.sggcc
961 Bumped dll-number from 2 to 3 in makefile.cygwin
962 Revised contrib/gregbook/rpng*-x.c to avoid a memory leak and to exit cleanly
963 if user attempts to run it on an 8-bit display.
964 Updated contrib/gregbook
965 Use png_malloc instead of png_zalloc to allocate palette in pngset.c
966 Updated makefile.ibmc
967 Added some typecasts to eliminate gcc 3.0 warnings. Changed prototypes
968 of png_write_oFFS width and height from png_uint_32 to png_int_32.
970 Revised prototypes for png_debug_malloc and png_debug_free in pngtest.c
971 version 1.2.0beta5 [August 8, 2001]
972 Revised contrib/gregbook
973 Revised makefile.gcmmx
974 Revised pnggccrd.c to conditionally compile some thread-unsafe code only
975 when PNG_THREAD_UNSAFE_OK is defined.
976 Added tests to prevent pngwutil.c from writing a bKGD or tRNS chunk with
977 value exceeding 2^bit_depth-1
978 Revised makefile.sgi and makefile.sggcc
979 Replaced calls to fprintf(stderr,...) with png_warning() in pnggccrd.c
980 Removed restriction that do_invert_mono only operate on 1-bit opaque files
981 version 1.2.0 [September 1, 2001]
982 Changed a png_warning() to png_debug() in pnggccrd.c
983 Fixed contrib/gregbook/rpng-x.c, rpng2-x.c to avoid crash with XFreeGC().
984 version 1.2.1beta1 [October 19, 2001]
985 Revised makefile.std in contrib/pngminus
986 Include background_1 in png_struct regardless of gamma support.
987 Revised makefile.netbsd and makefile.macosx, added makefile.darwin.
988 Revised example.c to provide more details about using row_callback().
989 version 1.2.1beta2 [October 25, 2001]
990 Added type cast to each NULL appearing in a function call, except for
993 version 1.2.1beta3 [October 27, 2001]
994 Removed type casts from all NULLs.
995 Simplified png_create_struct_2().
996 version 1.2.1beta4 [November 7, 2001]
997 Revised png_create_info_struct() and png_creat_struct_2().
998 Added error message if png_write_info() was omitted.
999 Type cast NULLs appearing in function calls when _NO_PROTO or
1000 PNG_TYPECAST_NULL is defined.
1001 version 1.2.1rc1 [November 24, 2001]
1002 Type cast NULLs appearing in function calls except when PNG_NO_TYPECAST_NULL
1004 Changed typecast of "size" argument to png_size_t in pngmem.c calls to
1005 the user malloc_fn, to agree with the prototype in png.h
1006 Added a pop/push operation to pnggccrd.c, to preserve Eflag (Maxim Sobolev)
1007 Updated makefile.sgi to recognize LIBPATH and INCPATH.
1008 Updated various makefiles so "make clean" does not remove previous major
1009 version of the shared library.
1010 version 1.2.1rc2 [December 4, 2001]
1011 Always allocate 256-entry internal palette, hist, and trans arrays, to
1012 avoid out-of-bounds memory reference caused by invalid PNG datastreams.
1013 Added a check for prefix_length > data_length in iCCP chunk handler.
1014 version 1.2.1 [December 7, 2001]
1016 version 1.2.2beta1 [February 22, 2002]
1017 Fixed a bug with reading the length of iCCP profiles (Larry Reeves).
1018 Revised makefile.linux, makefile.gcmmx, and makefile.sgi to generate
1019 libpng.a, libpng12.so (not libpng.so.3), and libpng12/png.h
1020 Revised makefile.darwin to remove "-undefined suppress" option.
1021 Added checks for gamma and chromaticity values over 21474.83, which exceed
1022 the limit for PNG unsigned 32-bit integers when encoded.
1023 Revised calls to png_create_read_struct() and png_create_write_struct()
1024 for simpler debugging.
1025 Revised png_zalloc() so zlib handles errors (uses PNG_FLAG_MALLOC_NULL_MEM_OK)
1026 version 1.2.2beta2 [February 23, 2002]
1027 Check chunk_length and idat_size for invalid (over PNG_MAX_UINT) lengths.
1028 Check for invalid image dimensions in png_get_IHDR.
1029 Added missing "fi;" in the install target of the SGI makefiles.
1030 Added install-static to all makefiles that make shared libraries.
1031 Always do gamma compensation when image is partially transparent.
1032 version 1.2.2beta3 [March 7, 2002]
1033 Compute background.gray and background_1.gray even when color_type is RGB
1034 in case image gets reduced to gray later.
1035 Modified shared-library makefiles to install pkgconfig/libpngNN.pc.
1036 Export (with PNGAPI) png_zalloc, png_zfree, and png_handle_as_unknown
1037 Removed unused png_write_destroy_info prototype from png.h
1038 Eliminated incorrect use of width_mmx from pnggccrd.c in pixel_bytes == 8 case
1039 Added install-shared target to all makefiles that make shared libraries.
1040 Stopped a double free of palette, hist, and trans when not using free_me.
1041 Added makefile.32sunu for Sun Ultra 32 and makefile.64sunu for Sun Ultra 64.
1042 version 1.2.2beta4 [March 8, 2002]
1043 Compute background.gray and background_1.gray even when color_type is RGB
1044 in case image gets reduced to gray later (Jason Summers).
1045 Relocated a misplaced /bin/rm in the "install-shared" makefile targets
1046 Added PNG_1_0_X macro which can be used to build a 1.0.x-compatible library.
1047 version 1.2.2beta5 [March 26, 2002]
1048 Added missing PNGAPI to several function definitions.
1049 Check for invalid bit_depth or color_type in png_get_IHDR(), and
1050 check for missing PLTE or IHDR in png_push_read_chunk() (Matthias Clasen).
1051 Revised iTXt support to accept NULL for lang and lang_key.
1052 Compute gamma for color components of background even when color_type is gray.
1053 Changed "()" to "{}" in scripts/libpng.pc.in.
1054 Revised makefiles to put png.h and pngconf.h only in $prefix/include/libpngNN
1055 Revised makefiles to make symlink to libpng.so.NN in addition to libpngNN.so
1056 version 1.2.2beta6 [March 31, 2002]
1057 version 1.0.13beta1 [March 31, 2002]
1058 Prevent png_zalloc() from trying to memset memory that it failed to acquire.
1059 Add typecasts of PNG_MAX_UINT in pngset_cHRM_fixed() (Matt Holgate).
1060 Ensure that the right function (user or default) is used to free the
1061 png_struct after an error in png_create_read_struct_2().
1062 version 1.2.2rc1 [April 7, 2002]
1063 version 1.0.13rc1 [April 7, 2002]
1064 Save the ebx register in pnggccrd.c (Sami Farin)
1065 Add "mem_ptr = png_ptr->mem_ptr" in png_destroy_write_struct() (Paul Gardner).
1066 Updated makefiles to put headers in include/libpng and remove old include/*.h.
1067 version 1.2.2 [April 15, 2002]
1068 version 1.0.13 [April 15, 2002]
1069 Revised description of png_set_filter() in libpng.3/libpng.txt.
1070 Revised makefile.netbsd and added makefile.neNNbsd and makefile.freebsd
1071 version 1.0.13patch01 [April 17, 2002]
1072 version 1.2.2patch01 [April 17, 2002]
1073 Changed ${PNGMAJ}.${PNGVER} bug to ${PNGVER} in makefile.sgi and makefile.sggcc
1074 Fixed VER -> PNGVER typo in makefile.macosx and added install-static to install
1075 Added install: target to makefile.32sunu and makefile.64sunu
1076 version 1.0.13patch03 [April 18, 2002]
1077 version 1.2.2patch03 [April 18, 2002]
1078 Revised 15 makefiles to link libpng.a to libpngNN.a and the include libpng
1079 subdirectory to libpngNN subdirectory without the full pathname.
1080 Moved generation of libpng.pc from "install" to "all" in 15 makefiles.
1081 version 1.2.3rc1 [April 28, 2002]
1082 Added install-man target to 15 makefiles (Dimitri Papadopolous-Orfanos).
1083 Added $(DESTDIR) feature to 24 makefiles (Tim Mooney)
1084 Fixed bug with $prefix, should be $(prefix) in makefile.hpux.
1085 Updated cygwin-specific portion of pngconf.h and revised makefile.cygwin
1086 Added a link from libpngNN.pc to libpng.pc in 15 makefiles.
1087 Added links from include/libpngNN/*.h to include/*.h in 24 makefiles.
1088 Revised makefile.darwin to make relative links without full pathname.
1089 Added setjmp() at the end of png_create_*_struct_2() in case user forgets
1090 to put one in their application.
1091 Restored png_zalloc() and png_zfree() prototypes to version 1.2.1 and
1092 removed them from module definition files.
1093 version 1.2.3rc2 [May 1, 2002]
1094 Fixed bug in reporting number of channels in pngget.c and pngset.c,
1095 that was introduced in version 1.2.2beta5.
1096 Exported png_zalloc(), png_zfree(), png_default_read(), png_default_write(),
1097 png_default_flush(), and png_push_fill_buffer() and included them in
1098 module definition files.
1099 Added "libpng.pc" dependency to the "install-shared" target in 15 makefiles.
1100 version 1.2.3rc3 [May 1, 2002]
1101 Revised prototype for png_default_flush()
1102 Remove old libpng.pc and libpngNN.pc before installing new ones.
1103 version 1.2.3rc4 [May 2, 2002]
1104 Typos in *.def files (png_default_read|write -> png_default_read|write_data)
1105 In makefiles, changed rm libpng.NN.pc to rm libpngNN.pc
1106 Added libpng-config and libpngNN-config and modified makefiles to install them.
1107 Changed $(MANPATH) to $(DESTDIR)$(MANPATH) in makefiles
1108 Added "Win32 DLL VB" configuration to projects/msvc/libpng.dsp
1109 version 1.2.3rc5 [May 11, 2002]
1110 Changed "error" and "message" in prototypes to "error_message" and
1111 "warning_message" to avoid namespace conflict.
1112 Revised 15 makefiles to build libpng-config from libpng-config-*.in
1113 Once more restored png_zalloc and png_zfree to regular nonexported form.
1114 Restored png_default_read|write_data, png_default_flush, png_read_fill_buffer
1115 to nonexported form, but with PNGAPI, and removed them from module def files.
1116 version 1.2.3rc6 [May 14, 2002]
1117 Removed "PNGAPI" from png_zalloc() and png_zfree() in png.c
1118 Changed "Gz" to "Gd" in projects/msvc/libpng.dsp and zlib.dsp.
1119 Removed leftover libpng-config "sed" script from four makefiles.
1120 Revised libpng-config creating script in 16 makefiles.
1121 version 1.2.3 [May 22, 2002]
1122 Revised libpng-config target in makefile.cygwin.
1123 Removed description of png_set_mem_fn() from documentation.
1124 Revised makefile.freebsd.
1125 Minor cosmetic changes to 15 makefiles, e.g., $(DI) = $(DESTDIR)/$(INCDIR).
1126 Revised projects/msvc/README.txt
1127 Changed -lpng to -lpngNN in LDFLAGS in several makefiles.
1128 version 1.2.4beta1 [May 24, 2002]
1129 Added libpng.pc and libpng-config to "all:" target in 16 makefiles.
1130 Fixed bug in 16 makefiles: $(DESTDIR)/$(LIBPATH) to $(DESTDIR)$(LIBPATH)
1131 Added missing "\" before closing double quote in makefile.gcmmx.
1132 Plugged various memory leaks; added png_malloc_warn() and png_set_text_2()
1134 version 1.2.4beta2 [June 25, 2002]
1135 Plugged memory leak of png_ptr->current_text (Matt Holgate).
1136 Check for buffer overflow before reading CRC in pngpread.c (Warwick Allison)
1137 Added -soname to the loader flags in makefile.dec, makefile.sgi, and
1139 Added "test-installed" target to makefile.linux, makefile.gcmmx,
1140 makefile.sgi, and makefile.sggcc.
1141 version 1.2.4beta3 [June 28, 2002]
1142 Plugged memory leak of row_buf in pngtest.c when there is a png_error().
1143 Detect buffer overflow in pngpread.c when IDAT is corrupted with extra data.
1144 Added "test-installed" target to makefile.32sunu, makefile.64sunu,
1145 makefile.beos, makefile.darwin, makefile.dec, makefile.macosx,
1146 makefile.solaris, makefile.hpux, makefile.hpgcc, and makefile.so9.
1147 version 1.2.4rc1 and 1.0.14rc1 [July 2, 2002]
1148 Added "test-installed" target to makefile.cygwin and makefile.sco.
1149 Revised pnggccrd.c to be able to back out version 1.0.x via PNG_1_0_X macro.
1150 version 1.2.4 and 1.0.14 [July 8, 2002]
1151 Changed png_warning() to png_error() when width is too large to process.
1152 version 1.2.4patch01 [July 20, 2002]
1153 Revised makefile.cygwin to use DLL number 12 instead of 13.
1154 version 1.2.5beta1 [August 6, 2002]
1155 Added code to contrib/gregbook/readpng2.c to ignore unused chunks.
1156 Replaced toucan.png in contrib/gregbook (it has been corrupt since 1.0.11)
1157 Removed some stray *.o files from contrib/gregbook.
1158 Changed png_error() to png_warning() about "Too much data" in pngpread.c
1159 and about "Extra compressed data" in pngrutil.c.
1160 Prevent png_ptr->pass from exceeding 7 in png_push_finish_row().
1161 Updated makefile.hpgcc
1162 Updated png.c and pnggccrd.c handling of return from png_mmx_support()
1163 version 1.2.5beta2 [August 15, 2002]
1164 Only issue png_warning() about "Too much data" in pngpread.c when avail_in
1166 Updated makefiles to install a separate libpng.so.3 with its own rpath.
1167 version 1.2.5rc1 and 1.0.15rc1 [August 24, 2002]
1168 Revised makefiles to not remove previous minor versions of shared libraries.
1169 version 1.2.5rc2 and 1.0.15rc2 [September 16, 2002]
1170 Revised 13 makefiles to remove "-lz" and "-L$(ZLIBLIB)", etc., from shared
1171 library loader directive.
1172 Added missing "$OBJSDLL" line to makefile.gcmmx.
1173 Added missing "; fi" to makefile.32sunu.
1174 version 1.2.5rc3 and 1.0.15rc3 [September 18, 2002]
1175 Revised libpng-config script.
1176 version 1.2.5 and 1.0.15 [October 3, 2002]
1177 Revised makefile.macosx, makefile.darwin, makefile.hpgcc, and makefile.hpux,
1179 Relocated two misplaced PNGAPI lines in pngtest.c
1180 version 1.2.6beta1 [October 22, 2002]
1181 Commented out warning about uninitialized mmx_support in pnggccrd.c.
1182 Changed "IBMCPP__" flag to "__IBMCPP__" in pngconf.h.
1183 Relocated two more misplaced PNGAPI lines in pngtest.c
1184 Fixed memory overrun bug in png_do_read_filler() with 16-bit datastreams,
1185 introduced in version 1.0.2.
1186 Revised makefile.macosx, makefile.dec, makefile.aix, and makefile.32sunu.
1187 version 1.2.6beta2 [November 1, 2002]
1188 Added libpng-config "--ldopts" output.
1189 Added "AR=ar" and "ARFLAGS=rc" and changed "ar rc" to "$(AR) $(ARFLAGS)"
1191 version 1.2.6beta3 [July 18, 2004]
1192 Reverted makefile changes from version 1.2.6beta2 and some of the changes
1193 from version 1.2.6beta1; these will be postponed until version 1.2.7.
1194 Version 1.2.6 is going to be a simple bugfix release.
1195 Changed the one instance of "ln -sf" to "ln -f -s" in each Sun makefile.
1196 Fixed potential overrun in pngerror.c by using strncpy instead of memcpy.
1197 Added "#!/bin/sh" at the top of configure, for recognition of the
1198 'x' flag under Cygwin (Cosmin).
1199 Optimized vacuous tests that silence compiler warnings, in png.c (Cosmin).
1200 Added support for PNG_USER_CONFIG, in pngconf.h (Cosmin).
1201 Fixed the special memory handler for Borland C under DOS, in pngmem.c
1203 Removed some spurious assignments in pngrutil.c (Cosmin).
1204 Replaced 65536 with 65536L, and 0xffff with 0xffffL, to silence warnings
1205 on 16-bit platforms (Cosmin).
1206 Enclosed shift op expressions in parentheses, to silence warnings (Cosmin).
1207 Used proper type png_fixed_point, to avoid problems on 16-bit platforms,
1208 in png_handle_sRGB() (Cosmin).
1209 Added compression_type to png_struct, and optimized the window size
1210 inside the deflate stream (Cosmin).
1211 Fixed definition of isnonalpha(), in pngerror.c and pngrutil.c (Cosmin).
1212 Fixed handling of unknown chunks that come after IDAT (Cosmin).
1213 Allowed png_error() and png_warning() to work even if png_ptr == NULL
1215 Replaced row_info->rowbytes with row_bytes in png_write_find_filter()
1217 Fixed definition of PNG_LIBPNG_VER_DLLNUM (Simon-Pierre).
1218 Used PNG_LIBPNG_VER and PNG_LIBPNG_VER_STRING instead of the hardcoded
1219 values in png.c (Simon-Pierre, Cosmin).
1220 Initialized png_libpng_ver[] with PNG_LIBPNG_VER_STRING (Simon-Pierre).
1221 Replaced PNG_LIBPNG_VER_MAJOR with PNG_LIBPNG_VER_DLLNUM in png.rc
1223 Moved the definition of PNG_HEADER_VERSION_STRING near the definitions
1224 of the other PNG_LIBPNG_VER_... symbols in png.h (Cosmin).
1225 Relocated #ifndef PNGAPI guards in pngconf.h (Simon-Pierre, Cosmin).
1226 Updated scripts/makefile.vc(a)win32 (Cosmin).
1227 Updated the MSVC project (Simon-Pierre, Cosmin).
1228 Updated the Borland C++ Builder project (Cosmin).
1229 Avoided access to asm_flags in pngvcrd.c, if PNG_1_0_X is defined (Cosmin).
1230 Commented out warning about uninitialized mmx_support in pngvcrd.c (Cosmin).
1231 Removed scripts/makefile.bd32 and scripts/pngdef.pas (Cosmin).
1232 Added extra guard around inclusion of Turbo C memory headers, in pngconf.h
1234 Renamed projects/msvc/ to projects/visualc6/, and projects/borland/ to
1235 projects/cbuilder5/ (Cosmin).
1236 Moved projects/visualc6/png32ms.def to scripts/pngw32.def,
1237 and projects/visualc6/png.rc to scripts/pngw32.rc (Cosmin).
1238 Added projects/visualc6/pngtest.dsp; removed contrib/msvctest/ (Cosmin).
1239 Changed line endings to DOS style in cbuilder5 and visualc6 files, even
1240 in the tar.* distributions (Cosmin).
1241 Updated contrib/visupng/VisualPng.dsp (Cosmin).
1242 Updated contrib/visupng/cexcept.h to version 2.0.0 (Cosmin).
1243 Added a separate distribution with "configure" and supporting files (Junichi).
1244 version 1.2.6beta4 [July 28, 2004]
1245 Added user ability to change png_size_t via a PNG_SIZE_T macro.
1246 Added png_sizeof() and png_convert_size() functions.
1247 Added PNG_SIZE_MAX (maximum value of a png_size_t variable.
1248 Added check in png_malloc_default() for (size_t)size != (png_uint_32)size
1249 which would indicate an overflow.
1250 Changed sPLT failure action from png_error to png_warning and abandon chunk.
1251 Changed sCAL and iCCP failures from png_error to png_warning and abandon.
1252 Added png_get_uint_31(png_ptr, buf) function.
1253 Added PNG_UINT_32_MAX macro.
1254 Renamed PNG_MAX_UINT to PNG_UINT_31_MAX.
1255 Made png_zalloc() issue a png_warning and return NULL on potential
1257 Turn on PNG_NO_ZALLOC_ZERO by default in version 1.2.x
1258 Revised "clobber list" in pnggccrd.c so it will compile under gcc-3.4.
1259 Revised Borland portion of png_malloc() to return NULL or issue
1260 png_error() according to setting of PNG_FLAG_MALLOC_NULL_MEM_OK.
1261 Added PNG_NO_SEQUENTIAL_READ_SUPPORTED macro to conditionally remove
1262 sequential read support.
1263 Added some "#if PNG_WRITE_SUPPORTED" blocks.
1264 #ifdef'ed out some redundancy in png_malloc_default().
1265 Use png_malloc instead of png_zalloc to allocate the pallete.
1266 version 1.2.6rc1 [August 4, 2004]
1267 Fixed buffer overflow vulnerability in png_handle_tRNS()
1268 Fixed integer arithmetic overflow vulnerability in png_read_png().
1269 Fixed some harmless bugs in png_handle_sBIT, etc, that would cause
1270 duplicate chunk types to go undetected.
1271 Fixed some timestamps in the -config version
1272 Rearranged order of processing of color types in png_handle_tRNS().
1273 Added ROWBYTES macro to calculate rowbytes without integer overflow.
1274 Updated makefile.darwin and removed makefile.macosx from scripts directory.
1275 Imposed default one million column, one-million row limits on the image
1276 dimensions, and added png_set_user_limits() function to override them.
1277 Revised use of PNG_SET_USER_LIMITS_SUPPORTED macro.
1278 Fixed wrong cast of returns from png_get_user_width|height_max().
1279 Changed some "keep the compiler happy" from empty statements to returns,
1280 version 1.2.6rc2 [August 7, 2004]
1281 Revised makefile.darwin and makefile.solaris. Removed makefile.macosx.
1282 Revised pngtest's png_debug_malloc() to use png_malloc() instead of
1283 png_malloc_default() which is not supposed to be exported.
1284 Fixed off-by-one error in one of the conversions to PNG_ROWBYTES() in
1285 pngpread.c. Bug was introduced in 1.2.6rc1.
1286 Fixed bug in RGB to RGBX transformation introduced in 1.2.6rc1.
1287 Fixed old bug in RGB to Gray transformation.
1288 Fixed problem with 64-bit compilers by casting arguments to abs()
1290 Changed "ln -sf" to "ln -f -s" in three makefiles (solaris, sco, so9).
1291 Changed "HANDLE_CHUNK_*" to "PNG_HANDLE_CHUNK_*" (Cosmin)
1292 Added "-@/bin/rm -f $(DL)/$(LIBNAME).so.$(PNGMAJ)" to 15 *NIX makefiles.
1293 Added code to update the row_info->colortype in png_do_read_filler() (MSB).
1294 version 1.2.6rc3 [August 9, 2004]
1295 Eliminated use of "abs()" in testing cHRM and gAMA values, to avoid
1296 trouble with some 64-bit compilers. Created PNG_OUT_OF_RANGE() macro.
1297 Revised documentation of png_set_keep_unknown_chunks().
1298 Check handle_as_unknown status in pngpread.c, as in pngread.c previously.
1299 Moved "PNG_HANDLE_CHUNK_*" macros out of PNG_INTERNAL section of png.h
1300 Added "rim" definitions for CONST4 and CONST6 in pnggccrd.c
1301 version 1.2.6rc4 [August 10, 2004]
1302 Fixed mistake in pngtest.c introduced in 1.2.6rc2 (declaration of
1303 "pinfo" was out of place).
1304 version 1.2.6rc5 [August 10, 2004]
1305 Moved "PNG_HANDLE_CHUNK_*" macros out of PNG_ASSEMBLER_CODE_SUPPORTED
1306 section of png.h where they were inadvertently placed in version rc3.
1307 version 1.2.6rc6 [August 15, 2004]
1308 Revised pngtest so memory allocation testing is only done when PNG_DEBUG==1.
1310 Send comments/corrections/commendations to
1311 png-implement@ccrc.wustl.edu or to glennrp@users.sourceforge.net
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