Libpng 1.6.18rc01 - July 9, 2015 This is not intended to be a public release. It will be replaced within a few weeks by a public version or by another test version. Files available for download: Source files with LF line endings (for Unix/Linux) and with a "configure" script 1.6.18rc01.tar.xz (LZMA-compressed, recommended) 1.6.18rc01.tar.gz Source files with CRLF line endings (for Windows), without the "configure" script lp1618r01.7z (LZMA-compressed, recommended) lp1618r01.zip Other information: 1.6.18rc01-README.txt 1.6.18rc01-LICENSE.txt libpng-1.6.18rc01-*.asc (armored detached GPG signatures) Changes since the last public release (1.6.17): Version 1.6.18beta01 [April 1, 2015] 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]). Version 1.6.18beta02 [April 26, 2015] Suppressed some warnings from the Borland C++ 5.5.1/5.82 compiler (Bug report by Viktor Szaka'ts). Version 1.6.18beta03 [May 6, 2015] 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). Version 1.6.18beta04 [May 20, 2015] 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). Version 1.6.18beta05 [May 31, 2015] 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. Version 1.6.18beta06 [June 1, 2015] 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. Version 1.6.18beta07 [June 6, 2015] 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). Fixed NO_WRITE_FILTER and -Wconversion build breaks (John Bowler). Fix g++ build breaks (John Bowler). 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. 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). Version 1.6.18beta08 [June 30, 2015] 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 png.h and pngstruct.h Version 1.6.18beta09 [July 5, 2015] Removed some useless typecasts from contrib/tools/png-fix-itxt.c Fixed a new signed-unsigned comparison in pngrtran.c (Max Stepin). Replaced arbitrary use of 'extern' with #define PNG_LINKAGE_*. To preserve API compatibility, the new defines all default to "extern" (requested by Jan Nijtmans). Version 1.6.18rc01 [July 9, 2015] 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