Libpng 1.6.22 - May 26, 2016

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-1.6.22.tar.xz (LZMA-compressed, recommended)
  libpng-1.6.22.tar.gz

Source files with CRLF line endings (for Windows), without the
"configure" script

  lpng1622.7z  (LZMA-compressed, recommended)
  lpng1622.zip

Other information:

  libpng-1.6.22-README.txt
  libpng-1.6.22-LICENSE.txt
  libpng-1.6.22-*.asc (armored detached GPG signatures)

Changes since the last public release (1.6.21):
 Changed PNG_USE_MKSTEMP to __COVERITY__ to select alternate
   "tmpfile()" implementation in contrib/libtests/pngstest.c
 Fixed NO_STDIO build of pngunknown.c to skip calling png_init_io()
   if there is no stdio.h support.
 Added a png_image_write_to_memory() API and a number of assist macros
   to allow an application that uses the simplified API write to bypass
   stdio and write directly to memory.
 Added some warnings (png.h) and some check code to detect *possible*
   overflow in the ROW_STRIDE and simplified image SIZE macros.  This
   disallows image width/height/format that *might* overflow.  This is
   a quiet API change that limits in-memory image size (uncompressed) to
   less than 4GByte and image row size (stride) to less than 2GByte.
 Revised workaround for false-positive Coverity issue in pngvalid.c.
 Only use exit(77) in configure builds.
 Updated CMakeLists.txt, added supporting scripts/gen*.cmake.in
   and test.cmake.in (Roger Leigh).
 Relaxed limit checks on gamma values in pngrtran.c. As suggested in
   the comments gamma values outside the range currently permitted
   by png_set_alpha_mode are useful for HDR data encoding.  These values
   are already permitted by png_set_gamma so it is reasonable caution to
   extend the png_set_alpha_mode range as HDR imaging systems are starting
   to emerge.
 Added a common-law trademark notice and export control information
   to the LICENSE file, png.h, and the man page.
 Restored "& 0xff" in png_save_uint_16() and png_save_uint_32() that
   were accidentally removed from libpng-1.6.17.
 Changed PNG_INFO_cHNK and PNG_FREE_cHNK from 0xnnnn to 0xnnnnU in png.h
   (Robert C. Seacord).
 Removed dubious "#if INT_MAX" test from png.h that was added to
   libpng-1.6.19 (John Bowler).
 Add ${INCLUDES} in scripts/genout.cmake.in (Bug report by Nixon Kwok).
 Updated LICENSE to say files in the contrib directory are not
   necessarily under the libpng license, and that some makefiles have
   other copyright owners.
 Added INTEL-SSE2 support (Mike Klein and Matt Sarett, Google, Inc.).
 Made contrib/libtests/timepng more robust.  The code no longer gives
   up/fails on invalid PNG data, it just skips it (with error messages).
   The code no longer fails on PNG files with data beyond IEND.  Options
   exist to use png_read_png (reading the whole image, not by row) and, in
   that case, to apply any of the supported transforms.  This makes for
   more realistic testing; the decoded data actually gets used in a
   meaningful fashion (John Bowler).
 Fixed some misleading indentation (Krishnaraj Bhat).
 Force GCC compilation to C89 if needed (Dagobert Michelsen).
 SSE filter speed improvements for bpp=3:
   memcpy-free implementations of load3() / store3().
   call load3() only when needed at the end of a scanline.
 Added PNG_FAST_FILTERS macro (defined as
   PNG_FILTER_NONE|PNG_FILTER_SUB|PNG_FILTER_UP).
 Various fixes for contrib/libtests/timepng.c
 Fixed typo (missing underscore) in #define PNG_READ_16_TO_8_SUPPORTED
   (Bug report by Y.Ohashik).
 Quieted two Coverity issues in contrib/libtests/timepng.c.
 Fixed issues with scripts/genout.cmake.in (David Capello, Nixon Kwok):
   Added support to use multiple directories in ZLIBINCDIR variable,
   Fixed CMAKE_C_FLAGS with multiple values when genout is compiled on MSVC,
   Fixed pnglibconf.c compilation on OS X including the sysroot path.
 Check for CLOCK_PROCESS_CPUTIME_ID when building /contrib/libtests/timepng.
 Check for the presence of clock_gettime() in configure.ac and Makefile.am.

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