Libpng 1.5.17 - June 27, 2013

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-1.5.17.tar.xz (LZMA-compressed, recommended)
  libpng-1.5.17.tar.gz
  libpng-1.5.17.tar.bz2

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

  lpng1517.7z  (LZMA-compressed, recommended)
  lpng1517.zip

Other information:

  libpng-1.5.17-README.txt
  libpng-1.5.17-LICENSE.txt

Changes since the last public release (1.5.16):

 Removed a redundant test from png_set_IHDR().
 Added set(CMAKE_CONFIGURATION_TYPES ...) to CMakeLists.txt (Andrew Hundt)
 Deleted set(CMAKE_BUILD_TYPE) block from CMakeLists.txt
 Make ARM NEON support work at compile time (not just configure time).
   This moves the test on __ARM_NEON__ into pngconf.h to avoid issues when
   using a compiler that compiles for multiple architectures at one time.
 Removed PNG_FILTER_OPTIMIZATIONS and PNG_ARM_NEON_SUPPORTED from
   pnglibconf.h, allowing more of the decisions to be made internally
   (pngpriv.h) during the compile.  Without this, symbol prefixing is broken
   under certain circumstances on ARM platforms.  Now only the API parts of
   the optimizations ('check' vs 'api') are exposed in the public header files
   except that the new setting PNG_ARM_NEON_OPT documents how libpng makes the
   decision about whether or not to use the optimizations.
 Protect symbol prefixing against CC/CPPFLAGS/CFLAGS useage.
   Previous iOS/Xcode fixes for the ARM NEON optimizations moved the test
   on __ARM_NEON__ from configure time to compile time.  This breaks symbol
   prefixing because the definition of the special png_init_filter_functions
   call was hidden at configure time if the relevant compiler arguments are
   passed in CFLAGS as opposed to CC.  This change attempts to avoid all
   the confusion that would result by declaring the init function even when
   it is not used, so that it will always get prefixed.
 Revised libpng.3 so that "doclifter" can process it.
 Revised example.c to illustrate use of PNG_DEFAULT_sRGB and PNG_GAMMA_MAC_18
   as parameters for png_set_gamma().  These have been available since
   libpng-1.5.4.

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