mirror of
https://git.code.sf.net/p/libpng/code.git
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369 lines
19 KiB
Plaintext
369 lines
19 KiB
Plaintext
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Libpng 1.7.0beta19 - September 16, 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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1.7.0beta19.tar.xz (LZMA-compressed, recommended)
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1.7.0beta19.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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lp170b19.7z (LZMA-compressed, recommended)
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lp170b19.zip
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Other information:
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1.7.0beta19-README.txt
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1.7.0beta19-LICENSE.txt
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Gnupg/*.asc (PGP armored detached signatures)
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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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Version 1.7.0alpha07 [January 10, 2013]
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Fixed conceivable but difficult to repro overflow. Also added two test
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programs to generate and test a PNG which should have the problem.
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Version 1.7.0alpha08 [January 17, 2013]
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Corrected previous attempt at overflow detection in png_set_unknown_chunks().
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Version 1.7.0alpha09 [January 21, 2013]
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Pulled changes to multi-chunk handling from libpng-1.6.0beta40.
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Version 1.7.0alpha10 [February 5, 2013]
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Make symbol prefixing work with the ARM neon optimizations. Also
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allow pngpriv.h to be included for preprocessor definitions only, so
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it can be used in non-C/C++ files.
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Added png_get_palette_max() function.
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Changed png_size_t to size_t throughout headers, make sRGB check numbers
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consistent.
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Fixed ARM support (Mans Rullgard).
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Removed stray out-of-order #endif and #ifdef (Mans Rullgard).
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Ported libpng 1.5 options.awk/dfn file handling to 1.7, fixed one bug.
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Rebuilt Makefile.in, configure, etc., with autoconf-2.69 and automake-1.13.
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Minor fixes to assembler changes, verified with a dummy .S file
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Removed cc -E workround, corrected png_get_palette_max API. Tested on
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SUN OS cc 5.9, which demonstrates the tokenization problem previously
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avoided by using /lib/cpp. Since all .dfn output is now protected
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in double quotes unless it is to be macro substituted the fix should work
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everywhere.
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Version 1.7.0beta01 [February 15, 2013]
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Enable parallel tests and rearrange TESTS order to take advantage of
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the massive speed improvements use a make capable of parallel builds
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on a multi-CPU machine and pass the right arguments to make (-j10000
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for GNU make) to get the build to run in parallel.
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Fixed previous support for Z_PREFIX in configure builds, corrected
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sCAL APIs; some of these use floating point arithmetic so need to be
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disabled if floating point arithmetic is switched off. This is a quiet API
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change - 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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Fixed make distcheck to skip over the test result files. They were
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being included because the whole of the 'tests' directory is included,
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fixed to just include the actual test files and tests/pngstest. Also
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reverted the previous erroneous change to remove the ${srcdir} from the
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front of contrib, scripts, projects and added an explanation of what is
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going on to Makefile.am
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Fixed missing dependency in --prefix builds. The intermediate
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internal 'prefix.h' file can only be generated correctly after pnglibconf.h,
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however the dependency was not in Makefile.am. The symptoms are
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unpredictable depending on the order make chooses to build pngprefix.h and
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pnglibconf.h, often the error goes unnoticed because there is a system
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pnglibconf.h to use instead.
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Accept "," as a separator in pnglibconf.dfa and allow for
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continuation lines. This adds to the syntax of "option" and "chunk" lines,
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allowing the elements to be separated by a "," at the end of an element and
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interpreting a "," at end of line as a continuation - so the following line
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is read. The new syntax is optional and solely provided for readability.
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Enclosed the new png_get_palette_max in #ifdef PNG_GET_PALETTE_MAX_SUPPORTED
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block, and revised pnglibconf.h and pnglibconf.h.prebuilt accordingly.
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Version 1.7.0beta02 [February 18, 2013]
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Fixed a race condition in the creation of the build 'scripts' directory
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while building with a parallel make.
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Use approved/supported Android method to check for NEON, use Linux/POSIX
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1003.1 API to check /proc/self/auxv avoiding buffer allocation and other
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library calls (ported from libpng15).
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Use parentheses more consistently in "#if defined(MACRO)" tests.
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Folded long lines.
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Version 1.7.0beta03 [February 22, 2013]
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Reenabled code to allow zero length PLTE chunks for MNG.
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Fixed ALIGNED_MEMORY support.
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Allow run-time ARM NEON checking to be disabled. A new configure option:
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--enable-arm-neon=always will stop the run-time checks. New checks
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within arm/arm_init.c will cause the code not to be compiled unless
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__ARM_NEON__ is set. This should make it fail safe (if someone asks
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for it on then the build will fail if it can't be done.)
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Updated the INSTALL document.
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Version 1.7.0beta04 [February 27, 2013]
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Revised INSTALL to recommend using CPPFLAGS instead of INCLUDES.
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Revised scripts/makefile.freebsd to respect ZLIBLIB and ZLIBINC.
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Revised scripts/dfn.awk to work with the buggy MSYS awk that has trouble
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with CRLF line endings.
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Version 1.7.0beta05 [March 5, 2013]
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Avoid a possible memory leak in contrib/gregbook/readpng.c
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Changed user chunk callback API to respect global and per chunk defaults.
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Previously a return of 0 from a user chunk callback would result in the
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chunk being saved (if this was safe, even if the chunk was unsafe-to-copy);
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this change respects the defaults set by the application, so unknown chunks
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can be discarded by default and known-safe ones preserved.
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Corrected Android builds and corrected libpng.vers with symbol
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prefixing. This adds an API to set optimization options externally,
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providing an alternative and general solution for the non-portable
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run-time tests used by the ARM Neon code. It also makes those tests
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compile and link on Android. The order of settings vs options in
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pnglibconf.h is reversed to allow settings to depend on options and
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options can now set (or override) the defaults for settings.
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Version 1.7.0beta06 [March 13, 2013]
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Corrected simplified API default gamma for color-mapped output, added
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a flag to change default. In 1.6.0 when the simplified API was used
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to produce color-mapped output from an input image with no gamma
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information the gamma assumed for the input could be different from
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that assumed for non-color-mapped output. In particular 16-bit depth
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input files were assumed to be sRGB encoded, whereas in the 'direct'
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case they were assumed to have linear data. This was an error. The
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fix makes the simplified API treat all input files the same way and
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adds a new flag to the png_image::flags member to allow the
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application/user to specify that 16-bit files contain sRGB data
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rather than the default linear.
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Fixed bugs in the pngpixel and makepng test programs.
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Fixed CMakelists.txt to allow building a single variant of the library
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(Claudio Bley):
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Introduced a PNG_LIB_TARGETS variable that lists all activated library
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targets. It is an error if this variable ends up empty, ie. you have
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to build at least one library variant.
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Made the *_COPY targets only depend on library targets actually being build.
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Use PNG_LIB_TARGETS to unify a code path.
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Changed the CREATE_SYMLINK macro to expect the full path to a file as the
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first argument. When symlinking the filename component of that path is
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determined and used as the link target.
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Use copy_if_different in the CREATE_SYMLINK macro.
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Eliminated two warnings from the Intel C compiler. The warnings are
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technically valid, although a reasonable treatment of division would
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show it to be incorrect.
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Version 1.7.0beta07 [April 14, 2013]
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Updated documentation of 1.5.x to 1.6.x changes in iCCP chunk handling.
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Fixed incorrect warning of excess deflate data. End condition - the
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warning would be produced if the end of the deflate stream wasn't read
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in the last row. The warning is harmless.
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Corrected the test on user transform changes on read. It was in the
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png_set of the transform function, but that doesn't matter unless the
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transform function changes the rowbuf size, and that is only valid if
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transform_info is called.
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Corrected a misplaced closing bracket in contrib/libtests/pngvalid.c
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(Flavio Medeiros).
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Corrected length written to uncompressed iTXt chunks (Samuli Suominen).
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Version 1.7.0beta08 [April 18, 2013]
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Added contrib/tools/fixitxt.c, to repair the erroneous iTXt chunk length
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written by libpng-1.6.0 and 1.6.1.
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Disallow storing sRGB information when the sRGB is not supported.
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Version 1.7.0beta09 [April 24, 2013]
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Exposed PNG chunk types in png.h
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Modified png_uint_32 macros/code to make as few assumptions as possible
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Revised stack marking in arm/filter_neon.S and configure.ac
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Ensure that NEON filter stuff is completely disabled when switched 'off'.
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Previously the ARM NEON specific files were still built if the option
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was switched 'off' as opposed to being explicitly disabled.
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Version 1.7.0beta10 [April 24, 2013]
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Attempt to fix the PNG_ARM_NEON configuration mess.
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Version 1.7.0beta11 [April 26, 2013]
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Test for 'arm*', not just 'arm' in the host_cpu configure variable.
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Version 1.7.0beta12 [April 30, 2013]
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Added png_app_warning for out-of-range unknown chunk index in
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png_set_unknown_chunk_location().
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Expanded manual paragraph about writing private chunks.
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Avoid dereferencing NULL pointer possibly returned from
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png_create_write_struct() (Andrew Church).
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Version 1.7.0beta13 [May 12, 2013]
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Revised contrib/pngminim/*/makefile to generate pnglibconf.h with the
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right zlib header files.
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Separated CPPFLAGS and CFLAGS in contrib/pngminim/*/makefile
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Updated contrib/pngminus/pnm2png.c (Paul Stewart):
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Check for EOF
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Ignore "#" delimited comments in input file to pnm2png.c.
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Fixed whitespace handling
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Added a call to png_set_packing()
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Initialize dimension values so if sscanf fails at least we have known
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invalid values.
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Calculate our own zlib windowBits when decoding rather than trusting the
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CMF bytes in the PNG datastream.
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Added an option to force maximum window size for inflating, which was
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the behavior of libpng15 and earlier.
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Added png-fix-itxt and png-fix-too-far-back to the built programs and
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removed warnings from the source code and timepng that are revealed as
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a result.
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Detect wrong libpng versions linked to png-fix-too-far-back, which currently
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only works with libpng versions that can be made to reliably fail when
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the deflate data contains an out-of-window reference. This means only
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1.6 and later.
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Attempt to detect configuration issues with png-fix-too-far-back, which
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requires both the correct libpng and the correct zlib to function
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correctly.
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Check ZLIB_VERNUM for mismatches, enclose #error in quotes
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Added information in the documentation about problems with and fixes for
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the bad CRC and bad iTXt chunk situations.
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Version 1.7.0beta14 [June 8, 2013]
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Removed a redundant test in png_set_IHDR().
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Added set(CMAKE_CONFIGURATION_TYPES ...) to CMakeLists.txt (Andrew Hundt)
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Deleted set(CMAKE_BUILD_TYPE) block from CMakeLists.txt
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Enclose the prototypes for the simplified write API in #ifdef STDIO/#endif
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Make ARM NEON support work at compile time (not just configure time).
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This moves the test on __ARM_NEON__ into pngconf.h to avoid issues when
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using a compiler that compiles for multiple architectures at one time.
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Removed PNG_FILTER_OPTIMIZATIONS and PNG_ARM_NEON_SUPPORTED from
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pnglibconf.h, allowing more of the decisions to be made internally
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(pngpriv.h) during the compile. Without this, symbol prefixing is broken
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under certain circumstances on ARM platforms. Now only the API parts of
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the optimizations ('check' vs 'api') are exposed in the public header files
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except that the new setting PNG_ARM_NEON_OPT documents how libpng makes the
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decision about whether or not to use the optimizations.
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Protect symbol prefixing against CC/CPPFLAGS/CFLAGS useage.
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Previous iOS/Xcode fixes for the ARM NEON optimizations moved the test
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on __ARM_NEON__ from configure time to compile time. This breaks symbol
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prefixing because the definition of the special png_init_filter_functions
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call was hidden at configure time if the relevant compiler arguments are
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passed in CFLAGS as opposed to CC. This change attempts to avoid all
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the confusion that would result by declaring the init function even when
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it is not used, so that it will always get prefixed.
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Version 1.7.0beta15 [June 18, 2013]
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Revised libpng.3 so that "doclifter" can process it.
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Version 1.7.0beta16 [July 5, 2013]
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Revised example.c to illustrate use of PNG_DEFAULT_sRGB and PNG_GAMMA_MAC_18
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as parameters for png_set_gamma(). These have been available since
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libpng-1.5.4.
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Renamed contrib/tools/png-fix-too-far-back.c to pngfix.c and revised it
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to check all compressed chunks known to libpng.
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Updated documentation to show default behavior of benign errors correctly.
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Added perfect hash code generation for lists of PNG chunks. This is
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a work in progress; checked in for use in pngfix.c
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Ported ARM no-read patch from libpng16.
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Ported pngfix.c patches from libpng16.
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Version 1.7.0beta17 [August 21, 2013]
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Revised manual about changes in iTXt chunk handling made in libpng-1.6.0.
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Added "/* SAFE */" comments in pngrutil.c and pngrtran.c where warnings
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may be erroneously issued by code-checking applications.
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Added information about png_set_options() to the manual.
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Delay calling png_init_filter_functions() until a row with nonzero filter
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is found.
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Version 1.7.0beta18 [September 16, 2013]
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Fixed inconsistent conditional compilation of png_chunk_unknown_handling()
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prototype, definition, and usage. Made it depend on
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PNG_HANDLE_AS_UNKNOWN_SUPPORTED everywhere.
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Version 1.7.0beta19 [September 16, 2013]
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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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