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46369f35c5
by earlier versions of GCC fixed for Cygwin and Min/GW (which both use old GCCs.) ARM support is enabled by default in zlib.props (unsupported by Microsoft) and ARM compilation is made possible by deleting the check for x86. The test programs cannot be run because they are not signed.
116 lines
5.5 KiB
Plaintext
116 lines
5.5 KiB
Plaintext
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Libpng 1.7.0alpha04 - December 21, 2012
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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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1.7.0alpha04.tar.xz (LZMA-compressed, recommended)
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1.7.0alpha04.tar.gz
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1.7.0alpha04.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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lp170a04.7z (LZMA-compressed, recommended)
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lp170a04.zip
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Other information:
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1.7.0alpha04-README.txt
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1.7.0alpha04-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 21, 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 by
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earlier versions of GCC fixed for Cygwin and Min/GW (which both use old GCCs.)
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ARM support is enabled by default in zlib.props (unsupported by Microsoft) and
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ARM compilation is made possible by deleting the check for x86. The test programs
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cannot be run because they are not signed.
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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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