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123 lines
5.8 KiB
Plaintext
123 lines
5.8 KiB
Plaintext
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Libpng 1.7.0alpha06 - January 1, 2013
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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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1.7.0alpha06.tar.xz (LZMA-compressed, recommended)
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1.7.0alpha06.tar.gz
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1.7.0alpha06.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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lp170a06.7z (LZMA-compressed, recommended)
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lp170a06.zip
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Other information:
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1.7.0alpha06-README.txt
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1.7.0alpha06-LICENSE.txt
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Changes since the last public release (1.6.0):
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Version 1.7.0alpha01 [December 15, 2012]
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Started 1.7.0 branch from libpng-1.6.0beta33.
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Made 8-bit compose and rgb_to_grayscale accuracy improvements. These
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changes cause 16-bit arithmetic to be used for 8-bit data in the gamma
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corrected compose and grayscale operations. The arithmetic errors have
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three sources all of which are fixed in this commit:
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1) 8-bit linear calculations produce massive errors for lower intensity
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values.
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2) The old 16-bit "16 to 8" gamma table code erroneously wrote the lowest
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output value into a table entry which corresponded to multiple output
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values (so where the value written should have been the closest to the
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transformed input value.)
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3) In a number of cases the code to access the 16-bit table did not round;
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it did a simple shift, which was wrong and made the side effects of (2)
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even worse.
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The new gamma code does not have the 16-to-8 problem at the cost of slightly
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more calculations and the algorithm used to minimize the number of
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calculations has been extended to all the 16-bit tables; it has advantages
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for any significant gamma correction.
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Rearranged png_struct, remove unused members, change png_set_filter handling
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png_struct members rearranged - partly to reorder to avoid packing, partly
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to put frequently accessed members at the start and partly to make
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the grouping more clear. png_set_filter code has been rewritten and the
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code shared with png_write_start_row moved to a common function. Comments
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in png.h have been made more clear. Minor fixes to
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contrib/libtests/timepng.c and some of the png_*_tRNS logic, including
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more error detection in png_set_tRNS.
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Cleaned up USER_LIMITS feature, removing members from png_struct when not
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required.
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Rearranged ARM-NEON optimizations to isolate the machine specific code to
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the hardware subdirectory, and add comments to pngrutil.c so that
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implementors of other optimizations will know what to do.
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Fixed cases of unquoted DESTDIR in Makefile.am.
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Rebuilt Makefile.in, configure, etc., with autoconf-2.69 and automake-1.12.5.
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Version 1.7.0alpha02 [December 17, 2012]
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Removed functions that were deprecated in libpng-1.6.0:
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png_reset_zstream(), png_info_init_3(), and png_data_freer() and its
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associated flags.
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Removed some duplicated lines from contrib/tools/scale.c and png.c.
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Changed some instances of png_warning() to png_app_error().
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Updated some left over "1.6.0beta32" in code sources.
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Fixed a "png_structp" prototype (should be png_structrp) in arm_init.c
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Updated the version-number hack in pngvalid.c
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Version 1.7.0alpha03 [December 19, 2012]
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Cleaned up and enhanced the configure option; libpng now correctly
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links and tests against zlib with a prefix; tests have been clarified; and
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irrelevant or obsolete things (as defined by the autotools man page) have
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been removed.
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Documented new PNG_ABORT behavior in the manual and commentary in pngerror.c
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Cleaned up whitespace in the synopsis portion of the manpage "libpng.3"
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Fixed previous support for Z_PREFIX in configure builds, corrected sCAL APIs;
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some of these use floating point arithmetic so they need to be disabled if
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floating point arithmetic is switched off. This is a quiet API change -
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previously it appeared that the APIs were supported if fixed point
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arithmetic was used internally, however they required certain APIs (floor,
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modf, frexp, atof) that are part of C floating point support. Changed
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png_fixed and the gamma code specific version of the same to avoid floor(),
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which may be a library function (not an intrinsic). Removed unused #if 0
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code.
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Disassembled the version number in scripts/options.awk (necessary for
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building on SunOs).
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Version 1.7.0alpha04 [December 23, 2012]
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Added scripts/makefile.msys contributed by Christopher M. Wheeler
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Made default Zlib compression settings be configurable. This adds #defines to
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pnglibconf.h to control the defaults.
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Fixed Windows build issues, enabled ARM compilation. Various warnings issued
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by earlier versions of GCC fixed for Cygwin and Min/GW (which both use old
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GCCs.) ARM support is enabled by default in zlib.props (unsupported by
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Microsoft) and ARM compilation is made possible by deleting the check for
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x86. The test programs cannot be run because they are not signed.
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Version 1.7.0alpha05 [December 24, 2012]
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Discontinued distributing libpng-1.x.x.tar.bz2.
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Discontinued distributing libpng-1.7.0-1.6.0-diff.txt and similar.
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Version 1.7.0alpha06 [January 1, 2013]
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Fixed 'make distcheck' on SUN OS - libpng.so was not being removed
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===========================================================================
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NOTICE November 17, 2012:
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The location of the git repository at SourceForge has changed.
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Visit http://libpng.sf.net/ for details.
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===========================================================================
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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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