ANNOUNCE - third_party/libpng - Git at Google


 Libpng 1.6.3beta09 - June 27, 2013

 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

    1.6.3beta09.tar.xz (LZMA-compressed, recommended)
    1.6.3beta09.tar.gz

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

    lp163b09.7z  (LZMA-compressed, recommended)
    lp163b09.zip

 Other information:

    1.6.3beta09-README.txt
    1.6.3beta09-LICENSE.txt

 Changes since the last public release (1.6.2):

 Version 1.6.3beta01 [April 25, 2013]
   Revised stack marking in arm/filter_neon.S and configure.ac.
   Ensure that NEON filter stuff is completely disabled when switched 'off'.
     Previously the ARM NEON specific files were still built if the option
     was switched 'off' as opposed to being explicitly disabled.

 Version 1.6.3beta02 [April 26, 2013]
   Test for 'arm*' not just 'arm' in the host_cpu configure variable.
   Rebuilt the configure scripts.

 Version 1.6.3beta03 [April 30, 2013]
   Expanded manual paragraph about writing private chunks, particularly
     the need to call png_set_keep_unknown_chunks() when writing them.
   Avoid dereferencing NULL pointer possibly returned from
      png_create_write_struct() (Andrew Church).

 Version 1.6.3beta05 [May 9, 2013]
   Calculate our own zlib windowBits when decoding rather than trusting the
     CMF bytes in the PNG datastream.
   Added an option to force maximum window size for inflating, which was
     the behavior of libpng15 and earlier.
   Added png-fix-itxt and png-fix-too-far-back to the built programs and
     removed warnings from the source code and timepng that are revealed as
     a result.
   Detect wrong libpng versions linked to png-fix-too-far-back, which currently
     only works with libpng versions that can be made to reliably fail when
     the deflate data contains an out-of-window reference.  This means only
     1.6 and later.
   Fixed gnu issues: g++ needs a static_cast, gcc 4.4.7 has a broken warning
     message which it is easier to work round than ignore.
   Updated contrib/pngminus/pnm2png.c (Paul Stewart):
     Check for EOF
     Ignore "#" delimited comments in input file to pnm2png.c.
     Fixed whitespace handling
     Added a call to png_set_packing()
     Initialize dimension values so if sscanf fails at least we have known
       invalid values.
   Attempt to detect configuration issues with png-fix-too-far-back, which
     requires both the correct libpng and the correct zlib to function
     correctly.
   Check ZLIB_VERNUM for mismatches, enclose #error in quotes
   Added information in the documentation about problems with and fixes for
     the bad CRC and bad iTXt chunk situations.

 Version 1.6.3beta06 [May 12, 2013]
   Allow contrib/pngminus/pnm2png.c to compile without WRITE_INVERT and
     WRITE_PACK supported (writes error message that it can't read P1 or
   Improved png-fix-too-far-back usage message, added --suffix option.
   Revised contrib/pngminim/*/makefile to generate pnglibconf.h with the
     right zlib header files.
   Separated CPPFLAGS and CFLAGS in contrib/pngminim/*/makefile

 Version 1.6.3beta07 [June 8, 2013]
   Removed a redundant test in png_set_IHDR().
   Added set(CMAKE_CONFIGURATION_TYPES ...) to CMakeLists.txt (Andrew Hundt)
   Deleted set(CMAKE_BUILD_TYPE) block from CMakeLists.txt
   Enclose the prototypes for the simplified write API in
     #ifdef PNG_STDIO_SUPPORTED/#endif
   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.

 Version 1.6.3beta08 [June 18, 2013]
   Revised libpng.3 so that "doclifter" can process it.

 Version 1.6.3beta09 [June 27, 2013]
   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.
   Renamed contrib/tools/png-fix-too-far-back.c to pngfix.c and revised it
     to check all compressed chunks known to libpng.

 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

	Libpng 1.6.3beta09 - June 27, 2013

	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

	1.6.3beta09.tar.xz (LZMA-compressed, recommended)
	1.6.3beta09.tar.gz

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

	lp163b09.7z (LZMA-compressed, recommended)
	lp163b09.zip

	Other information:

	1.6.3beta09-README.txt
	1.6.3beta09-LICENSE.txt

	Changes since the last public release (1.6.2):

	Version 1.6.3beta01 [April 25, 2013]
	Revised stack marking in arm/filter_neon.S and configure.ac.
	Ensure that NEON filter stuff is completely disabled when switched 'off'.
	Previously the ARM NEON specific files were still built if the option
	was switched 'off' as opposed to being explicitly disabled.

	Version 1.6.3beta02 [April 26, 2013]
	Test for 'arm*' not just 'arm' in the host_cpu configure variable.
	Rebuilt the configure scripts.

	Version 1.6.3beta03 [April 30, 2013]
	Expanded manual paragraph about writing private chunks, particularly
	the need to call png_set_keep_unknown_chunks() when writing them.
	Avoid dereferencing NULL pointer possibly returned from
	png_create_write_struct() (Andrew Church).

	Version 1.6.3beta05 [May 9, 2013]
	Calculate our own zlib windowBits when decoding rather than trusting the
	CMF bytes in the PNG datastream.
	Added an option to force maximum window size for inflating, which was
	the behavior of libpng15 and earlier.
	Added png-fix-itxt and png-fix-too-far-back to the built programs and
	removed warnings from the source code and timepng that are revealed as
	a result.
	Detect wrong libpng versions linked to png-fix-too-far-back, which currently
	only works with libpng versions that can be made to reliably fail when
	the deflate data contains an out-of-window reference. This means only
	1.6 and later.
	Fixed gnu issues: g++ needs a static_cast, gcc 4.4.7 has a broken warning
	message which it is easier to work round than ignore.
	Updated contrib/pngminus/pnm2png.c (Paul Stewart):
	Check for EOF
	Ignore "#" delimited comments in input file to pnm2png.c.
	Fixed whitespace handling
	Added a call to png_set_packing()
	Initialize dimension values so if sscanf fails at least we have known
	invalid values.
	Attempt to detect configuration issues with png-fix-too-far-back, which
	requires both the correct libpng and the correct zlib to function
	correctly.
	Check ZLIB_VERNUM for mismatches, enclose #error in quotes
	Added information in the documentation about problems with and fixes for
	the bad CRC and bad iTXt chunk situations.

	Version 1.6.3beta06 [May 12, 2013]
	Allow contrib/pngminus/pnm2png.c to compile without WRITE_INVERT and
	WRITE_PACK supported (writes error message that it can't read P1 or
	Improved png-fix-too-far-back usage message, added --suffix option.
	Revised contrib/pngminim/*/makefile to generate pnglibconf.h with the
	right zlib header files.
	Separated CPPFLAGS and CFLAGS in contrib/pngminim/*/makefile

	Version 1.6.3beta07 [June 8, 2013]
	Removed a redundant test in png_set_IHDR().
	Added set(CMAKE_CONFIGURATION_TYPES ...) to CMakeLists.txt (Andrew Hundt)
	Deleted set(CMAKE_BUILD_TYPE) block from CMakeLists.txt
	Enclose the prototypes for the simplified write API in
	#ifdef PNG_STDIO_SUPPORTED/#endif
	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.

	Version 1.6.3beta08 [June 18, 2013]
	Revised libpng.3 so that "doclifter" can process it.

	Version 1.6.3beta09 [June 27, 2013]
	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.
	Renamed contrib/tools/png-fix-too-far-back.c to pngfix.c and revised it
	to check all compressed chunks known to libpng.

	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