Libpng 1.5.18 - February 6, 2014

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-1.5.18.tar.xz (LZMA-compressed, recommended)
  libpng-1.5.18.tar.gz
  libpng-1.5.18.tar.bz2

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

  lpng1518.7z  (LZMA-compressed, recommended)
  lpng1518.zip

Other information:

  libpng-1.5.18-README.txt
  libpng-1.5.18-LICENSE.txt
  libpng-1.5.18-*.asc (PGP armored detached signatures)

Changes since the last public release (1.5.17):

 Delay calling png_init_filter_functions() until a row with nonzero filter
   is found.
 Changed tabs to 3 spaces in png_debug macros and changed '"%s"m'
   to '"%s" m' to improve portability among compilers.
 Added "-Wall" to CFLAGS in contrib/pngminim/*/makefile
 Conditionally compile some unused functions reported by -Wall in
   pngminim.
 Rebuilt configure scripts with automake-1.14.1 and autoconf-2.69
   in the tar distributions.
 Fixed 'unused' warnings and merged with libpng16 pngvalid.
   Various warnings revealed by configurations added to the tested
   configurations in libpng 1.6 need corresponding fixes in libpng 1.5.
   This takes the libpng 1.6 pngvalid.c and adds it back to libpng 1.5,
   however one write-only test is currently disabled because it does not
   work; possibly because of failures to reset or initialize the deflate
   stream correctly in write-only cases.
 Merged libpng-1.7 changes and created a single pngvalid.c
 Merged pngvalid and pngtest from libpng-1.5; made compressed chunks
   after IDAT work with the progressive read code (this is a minor and
   somewhat ugly fix-up; the proper fix is in 1.6).
 The 'make all-am' command no longer builds $(check_PROGRAMS), leading
   to a lack of checks on cross-builds such as ARM.  Makefile.am also
   requires correct dependencies for the check programs on pnglibconf.h
   otherwise parallel builds on fast machines can sometimes pick up the
   system pnglibconf.h.
 Rebuilt configure scripts with automake 1.14.1 and autoconf-2.69.
 Require automake-1.13 and enable automake "subdirs" feature in autoconf.ac.
 Allow unversioned links created on install to be disabled in configure.
   In configure builds 'make install' changes/adds links like png.h
   and libpng.a to point to the newly installed, versioned, files (e.g.
   libpng17/png.h and libpng17.a). Three new configure options and some
   rearrangement of Makefile.am allow creation of these links to be disabled.
 Removed potentially misleading warning from png_check_IHDR().
 Updated scripts/makefile.* to use CPPFLAGS (Cosmin)
 Quiet an uninitialized memory warning from VC2013 in png_get_png().

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