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-Libpng 1.6.18 - July 23, 2015
-
-This is a public release of libpng, intended for use in production codes.
-
-Files available for download:
-
-Source files with LF line endings (for Unix/Linux) and with a
-"configure" script
-
- libpng-1.6.18.tar.xz (LZMA-compressed, recommended)
- libpng-1.6.18.tar.gz
-
-Source files with CRLF line endings (for Windows), without the
-"configure" script
-
- lpng1618.7z (LZMA-compressed, recommended)
- lpng1618.zip
-
-Other information:
-
- libpng-1.6.18-README.txt
- libpng-1.6.18-LICENSE.txt
- libpng-1.6.18-*.asc (armored detached GPG signatures)
-
-Changes since the last public release (1.6.17):
- Removed PNG_SET_CHUNK_[CACHE|MALLOC]_LIMIT_SUPPORTED macros. They
- have been combined with PNG_SET_USER_LIMITS_SUPPORTED (resolves
- bug report by Andrew Church).
- Fixed rgb_to_gray checks and added tRNS checks to pngvalid.c. This
- fixes some arithmetic errors that caused some tests to fail on
- some 32-bit platforms (Bug reports by Peter Breitenlohner [i686]
- and Petr Gajdos [i586]).
- Suppressed some warnings from the Borland C++ 5.5.1/5.82 compiler
- (Bug report by Viktor Szaka'ts).
- Replaced "unexpected" with an integer (0xabadca11) in pngset.c
- where a long was expected, to avoid a compiler warning when PNG_DEBUG > 1.
- Added contrib/examples/simpleover.c, to demonstrate how to handle
- alpha compositing of multiple images, using the "simplified API"
- and an example PNG generation tool, contrib/examples/genpng.c
- (John Bowler).
- PNG_RELEASE_BUILD replaces tests where the code depended on the build base
- type and can be defined on the command line, allowing testing in beta
- builds (John Bowler).
- Avoid Coverity issue 80858 (REVERSE NULL) in pngtest.c
- Avoid a harmless potential integer overflow in png_XYZ_from_xy() (Bug
- report from Christopher Ferris).
- Backport filter selection code from libpng-1.7.0beta51, to combine
- sub_row, up_row, avg_row, and paeth_row into try_row and tst_row.
- Changed png_voidcast(), etc., to voidcast(), etc., in contrib/tools/pngfix.c
- to avoid confusion with the libpng private macros.
- Fixed old cut&paste bug in the weighted filter selection code in
- pngwutil.c, introduced in libpng-0.95, March 1997.
- Removed WRITE_WEIGHTED_FILTERED code, to save a few kbytes of the
- compiled library size. It never worked properly and as far as we can
- tell, no one uses it. The png_set_filter_heuristics() and
- png_set_filter_heuristics_fixed() APIs are retained but deprecated
- and do nothing.
- Quieted some Coverity issues in pngfix.c, png-fix-itxt.c, pngvalid.c,
- pngstest.c, and pngimage.c. Most seem harmless, but png-fix-itxt
- would only work with iTXt chunks with length 255 or less.
- Removed non-working progressive reader 'skip' function. This
- function has apparently never been used. It was implemented
- to support back-door modification of png_struct in libpng-1.4.x
- but (because it does nothing and cannot do anything) was apparently
- never tested (John Bowler).
- Fixed cexcept.h in which GCC 5 now reports that one of the auto
- variables in the Try macro needs to be volatile to prevent value
- being lost over the setjmp (John Bowler).
- Added #ifdef's to contrib/examples programs so people don't try
- to compile them without the minimum required support enabled
- (suggested by Flavio Medeiros).
- Eliminated the final two Coverity defects (insecure temporary file
- handling in contrib/libtests/pngstest.c; possible overflow of
- unsigned char in contrib/tools/png-fix-itxt.c). To use the "secure"
- file handling, define PNG_USE_MKSTEMP, otherwise "tmpfile()" will
- be used.
- Removed some unused WEIGHTED_FILTER macros from pngstruct.h
- Replaced arbitrary use of 'extern' with #define PNG_LINKAGE_*. To
- preserve API compatibility, the new defines all default to "extern"
- (requested by Jan Nijtmans).
- Belatedly added Mans Rullgard and James Yu to the list of Contributing
- Authors.
-
-Send comments/corrections/commendations to png-mng-implement at lists.sf.net
-(subscription required; visit
-https://lists.sourceforge.net/lists/listinfo/png-mng-implement
-to subscribe)
-or to glennrp at users.sourceforge.net
-
-Glenn R-P