119 lines
5.9 KiB
Plaintext
119 lines
5.9 KiB
Plaintext
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Libpng 1.6.3 - July 18, 2013
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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-1.6.3.tar.xz (LZMA-compressed, recommended)
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libpng-1.6.3.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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lpng163.7z (LZMA-compressed, recommended)
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lpng163.zip
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Other information:
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libpng-1.6.3-README.txt
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libpng-1.6.3-LICENSE.txt
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Changes since the last public release (1.6.2):
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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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Test for 'arm*' not just 'arm' in the host_cpu configure variable.
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Rebuilt the configure scripts.
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Expanded manual paragraph about writing private chunks, particularly
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the need to call png_set_keep_unknown_chunks() when writing them.
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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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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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Fixed gnu issues: g++ needs a static_cast, gcc 4.4.7 has a broken warning
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message which it is easier to work round than ignore.
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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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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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Allow contrib/pngminus/pnm2png.c to compile without WRITE_INVERT and
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WRITE_PACK supported (writes error message that it can't read P1 or
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Improved png-fix-too-far-back usage message, added --suffix option.
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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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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
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#ifdef PNG_STDIO_SUPPORTED/#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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Revised libpng.3 so that "doclifter" can process it.
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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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Only compile ARM code when PNG_READ_SUPPORTED is defined.
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Fixed undefined behavior in contrib/tools/pngfix.c and added new strip
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option. pngfix relied on undefined behavior and even a simple change from
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gcc to g++ caused it to fail. The new strip option 'unsafe' has been
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implemented and is the default if --max is given. Option names have
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been clarified, with --strip=transform now stripping the bKGD chunk,
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which was stripped previously with --strip=unused.
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Added all documented chunk types to pngpriv.h
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Unified pngfix.c source with libpng17.
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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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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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