src/png/ANNOUNCE

   1
   2 Libpng 1.5.7 - December 15, 2011
   3
   4 This is a public release of libpng, intended for use in production codes.
   5
   6 Files available for download:
   7
   8 Source files with LF line endings (for Unix/Linux) and with a
   9 "configure" script
  10
  11    libpng-1.5.7.tar.xz (LZMA-compressed, recommended)
  12    libpng-1.5.7.tar.gz
  13    libpng-1.5.7.tar.bz2
  14
  15 Source files with CRLF line endings (for Windows), without the
  16 "configure" script
  17
  18    lpng157.7z  (LZMA-compressed, recommended)
  19    lpng157.zip
  20
  21 Other information:
  22
  23    libpng-1.5.7-README.txt
  24    libpng-1.5.7-LICENSE.txt
  25
  26 Changes since the last public release (1.5.6):
  27   Added support for ARM processor (Mans Rullgard)
  28   Fixed bug in pngvalid on early allocation failure; fixed type cast in
  29     pngmem.c; pngvalid would attempt to call png_error() if the allocation
  30     of a png_struct or png_info failed. This would probably have led to a
  31     crash.  The pngmem.c implementation of png_malloc() included a cast
  32     to png_size_t which would fail on large allocations on 16-bit systems.
  33   Fix for the preprocessor of the Intel C compiler. The preprocessor
  34     splits adjacent @ signs with a space; this changes the concatentation
  35     token from @-@-@ to PNG_JOIN; that should work with all compiler
  36     preprocessors.
  37   Paeth filter speed improvements from work by Siarhei Siamashka. This
  38     changes the 'Paeth' reconstruction function to improve the GCC code
  39     generation on x86. The changes are only part of the suggested ones;
  40     just the changes that definitely improve speed and remain simple.
  41     The changes also slightly increase the clarity of the code.
  42   Check compression_type parameter in png_get_iCCP and remove spurious
  43     casts. The compression_type parameter is always assigned to, so must
  44     be non-NULL. The cast of the profile length potentially truncated the
  45     value unnecessarily on a 16-bit int system, so the cast of the (byte)
  46     compression type to (int) is specified by ANSI-C anyway.
  47   Fixed FP division by zero in pngvalid.c; the 'test_pixel' code left
  48     the sBIT fields in the test pixel as 0, which resulted in a floating
  49     point division by zero which was irrelevant but causes systems where
  50     FP exceptions cause a crash. Added code to pngvalid to turn on FP
  51     exceptions if the appropriate glibc support is there to ensure this is
  52     tested in the future.
  53   Added versioning to pnglibconf.h comments.
  54   Installed more accurate linear to sRGB conversion tables. The slightly
  55     modified tables reduce the number of 16-bit values that
  56     convert to an off-by-one 8-bit value.  The "makesRGB.c" code that was used
  57     to generate the tables is now in a contrib/sRGBtables sub-directory.
  58   Added run-time detection of NEON support.
  59   Multiple transform bug fixes plus a work-round for double gamma correction.
  60     libpng does not support more than one transform that requires linear data
  61     at once - if this is tried typically the results is double gamma
  62     correction. Since the simplified APIs can need rgb to gray combined with
  63     a compose operation it is necessary to do one of these outside the main
  64     libpng transform code. This check-in also contains fixes to various bugs
  65     in compose and rgb to gray (on palette).
  66   Fixes for C++ compilation using g++ When libpng source is compiled
  67     using g++. The compiler imposes C++ rules on the C source; thus it
  68     is desireable to make the source work with either C or C++ rules
  69     without throwing away useful error information.  This change adds
  70     png_voidcast to allow C semantic (void*) cases or the corresponding
  71     C++ static_cast operation, as appropriate.
  72   Added --noexecstack to assembler file compilation. GCC does not set
  73     this on assembler compilation, even though it does on C compilation.
  74     This creates security issues if assembler code is enabled; the
  75     work-around is to set it by default in the flags for $(CCAS)
  76   Removed "zTXt" from warning in generic chunk decompression function.
  77   Validate time settings passed to pngset() and png_convert_to_rfc1123()
  78     (Frank Busse).
  79   Added MINGW support to CMakeLists.txt
  80   Reject invalid compression flag or method when reading the iTXt chunk.
  81   Moved pngvalid.c into contrib/libtests
  82   Rebuilt Makefile.in, configure, etc., with autoconf-2.68
  83   Replaced an "#if" with "#ifdef" in pngrtran.c
  84   Revised #if PNG_DO_BC block in png.c (use #ifdef and add #else)
  85   Revised pngconf.h to use " __declspec(restrict)" only when MSC_VER >= 1400,
  86     as in libpng-1.5.4.
  87   Put CRLF line endings in the owatcom project files.
  88   Updated CMakeLists.txt to account for the relocation of pngvalid.c
  89   Minor fixes to pngvalid.c for gcc 4.6.2 compatibility to remove warnings
  90     reported by earlier versions.
  91
  92 Send comments/corrections/commendations to png-mng-implement at lists.sf.net
  93 (subscription required; visit
  94 https://lists.sourceforge.net/lists/listinfo/png-mng-implement
  95 to subscribe)
  96 or to glennrp at users.sourceforge.net
  97
  98 Glenn R-P