103 lines
4.6 KiB
Plaintext
103 lines
4.6 KiB
Plaintext
Libpng 1.6.24rc01 - July 25, 2016
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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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1.6.24rc01.tar.xz (LZMA-compressed, recommended)
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1.6.24rc01.tar.gz
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Source files with CRLF line endings (for Windows), without the
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"configure" script
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lp1624r01.7z (LZMA-compressed, recommended)
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lp1624r01.zip
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Other information:
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1.6.24rc01-README.txt
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1.6.24rc01-LICENSE.txt
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libpng-1.6.24rc01-*.asc (armored detached GPG signatures)
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Changes since the last public release (1.6.23):
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Version 1.6.24beta01 [June 11, 2016]
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Avoid potential overflow of the PNG_IMAGE_SIZE macro. This macro
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is not used within libpng, but is used in some of the examples.
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Version 1.6.24beta02 [June 23, 2016]
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Correct filter heuristic overflow handling. This was broken when the
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write filter code was moved out-of-line; if there is a single filter and
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the heuristic sum overflows the calculation of the filtered line is not
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completed. In versions prior to 1.6 the code was duplicated in-line
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and the check not performed, so the filter operation completed; however,
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in the multi-filter case where the sum is performed the 'none' filter would
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be selected if all the sums overflowed, even if it wasn't in the filter
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list. The fix to the first problem is simply to provide PNG_SIZE_MAX as
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the current lmins sum value; this means the sum can never exceed it and
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overflows silently. A reasonable compiler that does choose to inline
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the code will simply eliminate the sum check.
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The fix to the second problem is to use high precision arithmetic (this is
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implemented in 1.7), however a simple safe fix here is to chose the lowest
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numbered filter in the list from png_set_filter (this only works if the
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first problem is also fixed) (John Bowler).
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Use a more efficient absolute value calculation on SSE2 (Matthieu Darbois).
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Fixed the case where PNG_IMAGE_BUFFER_SIZE can overflow in the application
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as a result of the application using an increased 'row_stride'; previously
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png_image_finish_read only checked for overflow on the base calculation of
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components. (I.e. it checked for overflow of a 32-bit number on the total
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number of pixel components in the output format, not the possibly padded row
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length and not the number of bytes, which for linear formats is twice the
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number of components.)
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MSVC does not like '-(unsigned)', so replaced it with 0U-(unsigned)
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MSVC does not like (uInt) = -(unsigned) (i.e. as an initializer), unless
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the conversion is explicitly invoked by a cast.
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Put the SKIP definition in the correct place. It needs to come after the
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png.h include (see all the other .c files in contrib/libtests) because it
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depends on PNG_LIBPNG_VER.
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Removed the three compile warning options from the individual project
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files into the zlib.props globals. It increases the warning level from 4
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to All and adds a list of the warnings that need to be turned off. This is
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semi-documentary; the intent is to tell libpng users which warnings have
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been examined and judged non-fixable at present. The warning about
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structure padding is fixable, but it would be a signficant change (moving
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structure members around).
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Version 1.6.24beta03 [July 4, 2016]
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Optimized absolute value calculation in filter selection, similar to
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code in the PAETH decoder in pngrutil.c. Build with PNG_USE_ABS to
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use this.
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Added pngcp to the build together with a pngcp.dfa configuration test.
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Added high resolution timing to pngcp.
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Added "Common linking failures" section to INSTALL.
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Relocated misplaced #endif in png.c sRGB profile checking.
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Fixed two Coverity issues in pngcp.c.
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Version 1.6.24beta04 [July 8, 2016]
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Avoid filter-selection heuristic sum calculations in cases where only one
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filter is a candidate for selection. This trades off code size (added
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private png_setup_*_row_only() functions) for speed.
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Version 1.6.24beta05 [July 13, 2016]
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Fixed some indentation to comply with our coding style.
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Added contrib/tools/reindent.
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Version 1.6.24beta06 [July 18, 2016]
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Fixed more indentation to comply with our coding style.
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Eliminated unnecessary tests of boolean png_isaligned() vs 0.
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Version 1.6.24rc01 [July 25, 2016]
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No changes.
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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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