Log message:
Update to 1.6.2:

Version 1.6.2rc01 [April 18, 2013]
  Added contrib/tools/fixitxt.c, to repair the erroneous iTXt chunk length
    written by libpng-1.6.0 and 1.6.1.
  Disallow storing sRGB information when the sRGB is not supported.

Version 1.6.2rc02 [April 18, 2013]
  Merge pngtest.c with libpng-1.7.0

Version 1.6.2rc03 [April 22, 2013]
  Trivial spelling cleanup.

Version 1.6.2rc04 and 1.6.2rc05 [omitted]

Version 1.6.2rc06 [April 24, 2013]
  Reverted to version 1.6.2rc03.  Recent changes to arm/neon support
    have been ported to libpng-1.7.0beta09 and will reappear in version
    1.6.3beta01.

Log message:
Update png to 1.6.2beta01

Version 1.6.2beta01 [April 14, 2013]
  Updated documentation of 1.5.x to 1.6.x changes in iCCP chunk handling.
  Fixed incorrect warning of excess deflate data. End condition - the
    warning would be produced if the end of the deflate stream wasn't read
    in the last row.  The warning is harmless.
  Corrected the test on user transform changes on read. It was in the
    png_set of the transform function, but that doesn't matter unless the
    transform function changes the rowbuf size, and that is only valid if
    transform_info is called.
  Corrected a misplaced closing bracket in contrib/libtests/pngvalid.c
    (Flavio Medeiros).
  Corrected length written to uncompressed iTXt chunks (Samuli Suominen).

Log message:
Updated graphics/png to 1.6.1 [kim 2013-04-01]

Version 1.6.1beta06 [March 4, 2013]
  Better documentation of unknown handling API interactions.
  Corrected Android builds and corrected libpng.vers with symbol
    prefixing This adds an API to set optimization options externally,
    providing an alternative and general solution for the non-portable
    run-time tests used by the ARM Neon code.  It also makes those tests
    compile and link on Android.
  The order of settings vs options in pnglibconf.h is reversed to allow
    settings to depend on options and options can now set (or override) the
    defaults for settings.

Version 1.6.1beta07 [March 7, 2013]
  Corrected simplified API default gamma for color-mapped output, added
    a flag to change default. In 1.6.0 when the simplified API was used
    to produce color-mapped output from an input image with no gamma
    information the gamma assumed for the input could be different from
    that assumed for non-color-mapped output.  In particular 16-bit depth
    input files were assumed to be sRGB encoded, whereas in the 'direct'
    case they were assumed to have linear data.  This was an error.  The
    fix makes the simplified API treat all input files the same way and
    adds a new flag to the png_image::flags member to allow the
    application/user to specify that 16-bit files contain sRGB data
    rather than the default linear.
  Fixed bugs in the pngpixel and makepng test programs.

Version 1.6.1beta08 [March 7, 2013]
  Fixed CMakelists.txt to allow building a single variant of the library
    (Claudio Bley):
  Introduced a PNG_LIB_TARGETS variable that lists all activated library
    targets.  It is an error if this variable ends up empty, ie. you have
    to build at least one library variant.
  Made the *_COPY targets only depend on library targets actually being build.
  Use PNG_LIB_TARGETS to unify a code path.
  Changed the CREATE_SYMLINK macro to expect the full path to a file as the
    first argument. When symlinking the filename component of that path is
    determined and used as the link target.
  Use copy_if_different in the CREATE_SYMLINK macro.

Version 1.6.1beta09 [March 13, 2013]
  Eliminated two warnings from the Intel C compiler. The warnings are
    technically valid, although a reasonable treatment of division would
    show it to be incorrect.

Version 1.6.1rc01 [March 21, 2013]
  No changes.

Version 1.6.1 [March 28, 2013]
  No changes.

Log message:
Update to 1.6.1beta05 for a bugfix needed by wm/awesome (via
ImageMagick).

Version 1.6.1beta01 [February 16, 2013]
  Made symbol prefixing work with the ARM neon optimizations. Also allow
    pngpriv.h to be included for preprocessor definitions only, so it can
    be used in non-C/C++ files. Back ported from libpng 1.7.
  Made sRGB check numbers consistent.
  Ported libpng 1.5 options.awk/dfn file handling to 1.6, fixed one bug.
  Removed cc -E workround, corrected png_get_palette_max API Tested on
    SUN OS cc 5.9, which demonstrates the tokenization problem previously
    avoided by using /lib/cpp.  Since all .dfn output is now protected in
    double quotes unless it is to be macro substituted the fix should
    work everywhere.
  Enabled parallel tests - back ported from libpng-1.7.
  scripts/pnglibconf.dfa formatting improvements back ported from libpng17.
  Fixed a race condition in the creation of the build 'scripts' directory
    while building with a parallel make.
  Use approved/supported Android method to check for NEON, use Linux/POSIX
    1003.1 API to check /proc/self/auxv avoiding buffer allocation and other
    library calls (ported from libpng15).

Version 1.6.1beta02 [February 19, 2013]
  Use parentheses more consistently in "#if defined(MACRO)" tests.
  Folded long lines.
  Reenabled code to allow zero length PLTE chunks for MNG.

Version 1.6.1beta03 [February 22, 2013]
  Fixed ALIGNED_MEMORY support.
  Allow run-time ARM NEON checking to be disabled. A new configure option:
    --enable-arm-neon=always will stop the run-time checks. New checks
    within arm/arm_init.c will cause the code not to be compiled unless
    __ARM_NEON__ is set. This should make it fail safe (if someone asks
    for it on then the build will fail if it can't be done.)
  Updated the INSTALL document.

Version 1.6.1beta04 [February 27, 2013]
  Revised INSTALL to recommend using CPPFLAGS instead of INCLUDES.
  Revised scripts/makefile.freebsd to respect ZLIBLIB and ZLIBINC.
  Revised scripts/dfn.awk to work with the buggy MSYS awk that has trouble
    with CRLF line endings.

Version 1.6.1beta05 [March 2, 2013]
  Avoid a possible memory leak in contrib/gregbook/readpng.c
  Fixed bug introduced in libpng-1.6.0beta28 that causes libpng to handle chunks
    even when they have been tagged PNG_HANDLE_CHUNK_NEVER.

Log message:
Update to 1.6.0:

This release adds a "simplified API" and removes some features
that have been deprecated since libpng.1.5.x.

Changes to Libpng from version 1.5.x to 1.6.x:

A "simplified API" has been added (see documentation in png.h and a simple
example in contrib/examples/pngtopng.c).  The new publicly visible API
includes the following:

   macros:
     PNG_FORMAT_*
     PNG_IMAGE_*
   structures:
     png_control
     png_image
   read functions
     png_image_begin_read_from_file()
     png_image_begin_read_from_stdio()
     png_image_begin_read_from_memory()
     png_image_finish_read()
     png_image_free()
   write functions
     png_image_write_to_file()
     png_image_write_to_stdio()

Starting with libpng-1.6.0, you can configure libpng to prefix all exported
symbols, using the PNG_PREFIX macro.

We no longer include string.h in png.h.  The include statement has been moved
to pngpriv.h, where it is not accessible by applications.  Applications that
need access to information in string.h must add an '#include "string.h"'
directive.  It does not matter whether this is placed prior to or after
the '"#include png.h"' directive.

The following API are now DEPRECATED:
   png_info_init_3()
   png_convert_to_rfc1123() which has been replaced
     with png_convert_to_rfc1123_buffer()
   png_data_freer()
   png_malloc_default()
   png_free_default()
   png_reset_zstream()

The following has been removed:
   png_get_io_chunk_name(), which has been replaced
     with png_get_io_chunk_type().  The new
     function returns a 32-bit integer instead of
     a string.
   The png_sizeof(), png_strlen(), png_memcpy(), png_memcmp(), and
     png_memset() macros are no longer used in the libpng sources and
     have been removed.  These had already been made invisible to
applications
     (i.e., defined in the private pngpriv.h header file) since
libpng-1.5.0.

The signatures of many exported functions were changed, such that
   png_structp became png_structrp or png_const_structrp
   png_infop became png_inforp or png_const_inforp
where "rp" indicates a "restricted pointer".

Error detection in some chunks has improved; in particular the iCCP chunk
reader now does pretty complete validation of the basic format.  Some bad
profiles that were previously accepted are now rejected, in particular the
very old broken Microsoft/HP sRGB profile.

The library now issues a warning if both background processing and RGB to
gray are used when gamma correction happens. As with previous versions of
the library the results are numerically very incorrect in this case.

There are some minor arithmetic changes in some transforms such as
png_set_background(), that might be detected by certain regression tests.

Unknown chunk handling has been improved internally, without any API change.
This adds more correct option control of the unknown handling, corrects
a pre-existing bug where the per-chunk 'keep' setting is ignored, and makes
it possible to skip IDAT chunks in the sequential reader.

Log message:
Update to 1.5.14:

Changes since the last public release (1.5.13):
  Added -DZ_SOLO to contrib/pngminim/*/makefile to work with zlib-1.2.7
  Warn about the incorrect runtime library setting for VS2010 debug DLL builds.
  Fixed build when using #define PNG_NO_READ_GAMMA in png_do_compose() in
    pngrtran.c (Domani Hannes).
  Check for png_ptr==NULL earlier in png_zalloc().
  Ignore, with a warning, out-of-range value of num_trans in png_set_tRNS().
  Rearranged building of ARM NEON optimizations. The ARM specific code is
    split out entirely to the arm subdirectory and changes to configure.acand
    Makefile.am to add new stuff are reduced.  Now material code changes,
    although for build test purposes, --enable-arm-neon now builds on non-ARM
    systems.
  Rebuilt Makefile.in, configure, etc., with autoconf-2.69 and automake-1.12.5.
  Fixed cases of unquoted DESTDIR in Makefile.am
  Fixed a minor bug in types to malloc and major bug in handling compressed
    iTXt. Compressed iTXt could not be handled.
  Cleaned up whitespace in the synopsis portion of the manpage "libpng.3"
  Disassembled the version number in scripts/options.awk (necessary for
    building on SunOs).
  Fixed Windows build issues, enabled ARM compilation. Various warnings issued
    by earlier versions of GCC fixed for Cygwin and Min/GW (which both use old
    GCCs.) ARM support is enabled by default in zlib.props (unsupported by
    Microsoft) and ARM compilation is made possible by deleting the check for
    x86. The test programs cannot be run because they are not signed.
  Fixed 'make distcheck' on SUN OS - libpng.so was not being removed
  Replaced AM_CONFIG_HEADER(config.h) with AC_CONFIG_HEADERS([config.h])
    in configure.ac
  De-configured build fixes to make a range of deconfiguration options (such
    as switching off read or write support) work in more cases.  Also upgraded
    pngtest and pngvalid to the libpng 1.6 versions (with some modifications)
    which provide more extensive testing.  Replaced pngtest.png because pngtest
    writes the ancillary chunks in a different order.
  Check validity of "num_unknowns" parameter of png_set_unknown_chunks()
    (Bug report from yuris).
  Check the validity of the "nentries" parameter of png_set_sPLT() and the
  "num_text" parameter of png_set_text_2().

Log message:
Drop superfluous PKG_DESTDIR_SUPPORT, "user-destdir" is default these days.

Log message:
Update to 1.5.13:

Version 1.5.13beta01 [August 8, 2012]
  Do not compile PNG_DEPRECATED, PNG_ALLOC and PNG_PRIVATE when __GNUC__ < 3.
  Removed references to png_zalloc() and png_zfree() from the manual.
  Revised PNG_FP_EXPORT and PNG_FIXED_EXPORT macros to avoid generating
    lone semicolons (patch ported from libpng-1.6.0beta11).

Version 1.5.13beta02 [September 10, 2012]
  Corrected handling of the image array and the row_pointers array in example.c
  When png_set_filler is used to strip a filler channel during write, the
    code prior to 1.5 would ignore the case where the output required an
    alpha channel or when the output was a palettized PNG.  In libpng-1.5 the
    ignorance was lost and libpng proceeded to strip the channel resulting
    in a bad (potential memory overwrite) failure later.  This reverts
    the behavior to the pre-1.5 state but issues a warning. libpng-1.6 is
    expected to issue an error on the erroneous png_set_filler call.
  Use png_memset() consistently (pngmem.c contained some bare "memset" \ 
calls).

Version 1.5.13rc01 [September 17, 2012]
  No changes.

Version 1.5.13 [September 27, 2012]
  No changes.