132 lines
6.4 KiB
Plaintext
132 lines
6.4 KiB
Plaintext
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Libpng 1.5.7rc02 - December 2, 2011
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This is not intended to be a public release. It will be replaced
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within a few weeks by a public version or by another test version.
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Files available for download:
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Source files with LF line endings (for Unix/Linux) and with a
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"configure" script
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1.5.7rc02.tar.xz (LZMA-compressed, recommended)
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1.5.7rc02.tar.gz
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1.5.7rc02.tar.bz2
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Source files with CRLF line endings (for Windows), without the
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"configure" script
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lp157r02.7z (LZMA-compressed, recommended)
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lp157r02.zip
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Other information:
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1.5.7rc02-README.txt
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1.5.7rc02-LICENSE.txt
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Changes since the last public release (1.5.6):
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Version 1.5.7beta01 [November 4, 2011]
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Added support for ARM processor (Mans Rullgard)
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Fixed bug in pngvalid on early allocation failure; fixed type cast in
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pngmem.c; pngvalid would attempt to call png_error() if the allocation
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of a png_struct or png_info failed. This would probably have led to a
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crash. The pngmem.c implementation of png_malloc() included a cast
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to png_size_t which would fail on large allocations on 16-bit systems.
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Fix for the preprocessor of the Intel C compiler. The preprocessor
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splits adjacent @ signs with a space; this changes the concatentation
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token from @-@-@ to PNG_JOIN; that should work with all compiler
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preprocessors.
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Paeth filter speed improvements from work by Siarhei Siamashka. This
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changes the 'Paeth' reconstruction function to improve the GCC code
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generation on x86. The changes are only part of the suggested ones;
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just the changes that definitely improve speed and remain simple.
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The changes also slightly increase the clarity of the code.
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Version 1.5.7beta02 [November 11, 2011]
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Check compression_type parameter in png_get_iCCP and remove spurious
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casts. The compression_type parameter is always assigned to, so must
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be non-NULL. The cast of the profile length potentially truncated the
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value unnecessarily on a 16-bit int system, so the cast of the (byte)
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compression type to (int) is specified by ANSI-C anyway.
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Fixed FP division by zero in pngvalid.c; the 'test_pixel' code left
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the sBIT fields in the test pixel as 0, which resulted in a floating
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point division by zero which was irrelevant but causes systems where
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FP exceptions cause a crash. Added code to pngvalid to turn on FP
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exceptions if the appropriate glibc support is there to ensure this is
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tested in the future.
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Updated scripts/pnglibconf.mak and scripts/makefile.std to handle the
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new PNG_JOIN macro.
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Added versioning to pnglibconf.h comments.
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Simplified read/write API initial version; basic read/write tested on
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a variety of images, limited documentation (in the header file.)
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Installed more accurate linear to sRGB conversion tables. The slightly
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modified tables reduce the number of 16-bit values that
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convert to an off-by-one 8-bit value. The "makesRGB.c" code that was used
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to generate the tables is now in a contrib/sRGBtables sub-directory.
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Version 1.5.7beta03 [November 17, 2011]
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Removed PNG_CONST from the sRGB table declarations in pngpriv.h and png.c
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Added run-time detection of NEON support.
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Added contrib/libtests; includes simplified API test and timing test and
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a color conversion utility for rapid checking of failed 'pngstest' results.
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Multiple transform bug fixes plus a work-round for double gamma correction.
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libpng does not support more than one transform that requires linear data
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at once - if this is tried typically the results is double gamma
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correction. Since the simplified APIs can need rgb to gray combined with
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a compose operation it is necessary to do one of these outside the main
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libpng transform code. This check-in also contains fixes to various bugs
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in the simplified APIs themselves and to some bugs in compose and rgb to
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gray (on palette) itself.
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Fixes for C++ compilation using g++ When libpng source is compiled
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using g++. The compiler imposes C++ rules on the C source; thus it
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is desireable to make the source work with either C or C++ rules
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without throwing away useful error information. This change adds
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png_voidcast to allow C semantic (void*) cases or the corresponding
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C++ static_cast operation, as appropriate.
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Added --noexecstack to assembler file compilation. GCC does not set
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this on assembler compilation, even though it does on C compilation.
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This creates security issues if assembler code is enabled; the
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work-around is to set it by default in the flags for $(CCAS)
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Work around compilers that don't support declaration of const data. Some
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compilers fault 'extern const' data declarations (because the data is
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not initialized); this turns on const-ness only for compilers where
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this is known to work.
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Version 1.5.7beta04 [November 17, 2011]
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Since the gcc driver does not recognize the --noexecstack flag, we must
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use the -Wa prefix to have it passed through to the assembler.
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Also removed a duplicate setting of this flag.
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Added files that were omitted from the libpng-1.5.7beta03 zip distribution.
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Version 1.5.7beta05 [November 25, 2011]
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Removed "zTXt" from warning in generic chunk decompression function.
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Validate time settings passed to pngset() and png_convert_to_rfc1123()
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(Frank Busse).
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Added MINGW support to CMakeLists.txt
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Reject invalid compression flag or method when reading the iTXt chunk.
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Backed out 'simplified' API changes. The API seems too complex and there
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is a lack of consensus or enthusiasm for the proposals. The API also
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reveals significant bugs inside libpng (double gamma correction and the
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known bug of being unable to retrieve a corrected palette). It seems
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better to wait until the bugs, at least, are corrected.
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Moved pngvalid.c into contrib/libtests
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Rebuilt Makefile.in, configure, etc., with autoconf-2.68
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Version 1.5.7rc01 [December 1, 2011]
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Replaced an "#if" with "#ifdef" in pngrtran.c
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Revised #if PNG_DO_BC block in png.c (use #ifdef and add #else)
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Version 1.5.7rc02 [December 2, 2011]
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Revised project files and contrib/pngvalid/pngvalid.c to account for
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the relocation of pngvalid into contrib/libtests.
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Revised pngconf.h to use " __declspec(restrict)" only when MSC_VER >= 1400,
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as in libpng-1.5.4.
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Send comments/corrections/commendations to png-mng-implement at lists.sf.net:
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(subscription required; visit
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https://lists.sourceforge.net/lists/listinfo/png-mng-implement
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to subscribe) or to glennrp at users.sourceforge.net
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Glenn R-P
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