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