92 lines
4.2 KiB
Plaintext
92 lines
4.2 KiB
Plaintext
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Libpng 1.5.5 - September 22, 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
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"configure" script
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libpng-1.5.5.tar.xz (LZMA-compressed, recommended)
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libpng-1.5.5.tar.gz
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libpng-1.5.5.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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lpng155.7z (LZMA-compressed, recommended)
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lpng155.zip
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Other information:
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libpng-1.5.5-README.txt
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libpng-1.5.5-LICENSE.txt
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Changes since the last public release (1.5.4):
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Fixed some typos and made other minor changes in the manual.
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Updated contrib/pngminus/makefile.std (Samuli Souminen)
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Revised Makefile.am and Makefile.in to look in the right directory for
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pnglibconf.h.prebuilt
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Enabled compilation with g++ compiler. This compiler does not recognize
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the file extension, so it always compiles with C++ rules. Made minor
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changes to pngrutil.c to cast results where C++ expects it but C does not.
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Minor editing of libpng.3 and libpng-manual.txt.
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Revised CMakeLists.txt (Clifford Yapp)
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Updated commentary about the png_rgb_to_gray() default coefficients
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in the manual and in pngrtran.c
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Prevent unexpected API exports from non-libpng DLLs on Windows. The "_DLL"
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is removed from the test of whether a DLL is being built (this erroneously
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caused the libpng APIs to be marked as DLL exports in static builds under
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Microsoft Visual Studio). Almost all of the libpng building configuration
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is moved from pngconf.h to pngpriv.h, but PNG_DLL_EXPORT remains in
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pngconf.h, though, so that it is colocated with the import definition (it
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is no longer used anywhere in the installed headers). The VStudio project
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definitions have been cleaned up: "_USRDLL" has been removed from the
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static library builds (this was incorrect), and PNG_USE_DLL has been added
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to pngvalid to test the functionality (pngtest does not supply it,
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deliberately). The spurious "_EXPORTS" has been removed from the
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libpng build (all these errors were a result of copy/paste between project
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configurations.)
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Added new types and internal functions for CIE RGB end point handling to
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pngpriv.h (functions yet to be implemented).
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Ensure the CMAKE_LIBRARY_OUTPUT_DIRECTORY is set in CMakeLists.txt
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(Clifford Yap)
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Fixes to rgb_to_gray and cHRM XYZ APIs (John Bowler):
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The rgb_to_gray code had errors when combined with gamma correction.
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Some pixels were treated as true grey when they weren't and such pixels
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and true grey ones were not gamma corrected (the original value of the
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red component was used instead). APIs to get and set cHRM using color
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space end points have been added and the rgb_to_gray code that defaults
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based on cHRM, and the divide-by-zero bug in png_handle_cHRM (CERT
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VU#477046, CVE-2011-3328, introduced in 1.5.4) have been corrected.
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A considerable number of tests has been added to pngvalid for the
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rgb_to_gray transform.
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Arithmetic errors in rgb_to_gray whereby the calculated gray value was
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truncated to the bit depth rather than rounded have been fixed except in
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the 8-bit non-gamma-corrected case (where consistency seems more important
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than correctness.) The code still has considerable inaccuracies in the
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8-bit case because 8-bit linear arithmetic is used.
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Added "$(ARCH)" option to makefile.darwin
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Added SunOS support to configure.ac and Makefile.am
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Changed png_chunk_benign_error() to png_warning() in png.c, in
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png_XYZ_from_xy_checked().
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Fixed 64-bit compilation errors (gcc). The errors fixed relate
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to conditions where types that are 32 bits in the GCC 32-bit
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world (uLong and png_size_t) become 64 bits in the 64-bit
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world. This produces potential truncation errors that the
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compiler correctly flags.
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Constant changes for 64-bit compatibility (removal of L suffixes). The
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16-bit cases still use "L" as we don't have a 16-bit test system.
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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)
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or to glennrp at users.sourceforge.net
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Glenn R-P
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*/ }
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#endif
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