ANNOUNCE - third_party/libpng - Git at Google


 Libpng 1.6.0beta08 - January 29, 2012

 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

    1.6.0beta08.tar.xz (LZMA-compressed, recommended)
    1.6.0beta08.tar.gz
    1.6.0beta08.tar.bz2

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

    lp160b08.7z  (LZMA-compressed, recommended)
    lp160b08.zip

 Other information:

    1.6.0beta08-README.txt
    1.6.0beta08-LICENSE.txt

 Changes since the last public release (1.5.7):

 Version 1.6.0beta01 [December 15, 2011]
   Removed machine-generated configure files from the GIT repository (they will
     continue to appear in the tarball distributions).
   Restored the new 'simplified' API, which was started in libpng-1.5.7beta02
     but later deleted from libpng-1.5.7beta05.
   Added example programs for the new 'simplified' API.
   Added ANSI-C (C90) headers and require them, and take advantage of the
     change. Also fixed some of the projects/* and contrib/* files that needed
     updates for libpng16 and the move of pngvalid.c.
     With this change the required ANSI-C header files are assumed to exist: the
     implementation must provide float.h, limits.h, stdarg.h and stddef.h and
     libpng relies on limits.h and stddef.h existing and behaving as defined
     (the other two required headers aren't used).  Non-ANSI systems that don't
     have stddef.h or limits.h will have to provide an appropriate fake
     containing the relevant types and #defines.
   The use of FAR/far has been eliminated and the definition of png_alloc_size_t
     is now controlled by a flag so that 'small size_t' systems can select it
     if necessary.  Libpng 1.6 may not currently work on such systems -- it
     seems likely that it will ask 'malloc' for more than 65535 bytes with any
     image that has a sufficiently large row size (rather than simply failing
     to read such images).
   New tools directory containing tools used to generate libpng code.
   Fixed race conditions in parallel make builds. With higher degrees of
     parallelism during 'make' the use of the same temporary file names such
     as 'dfn*' can result in a race where a temporary file from one arm of the
     build is deleted or overwritten in another arm.  This changes the
     temporary files for suffix rules to always use $* and ensures that the
     non-suffix rules use unique file names.

 Version 1.6.0beta02 [December 21, 2011]
   Correct configure builds where build and source directories are separate.
     The include path of 'config.h' was erroneously made relative in pngvalid.c
     in libpng 1.5.7.

 Version 1.6.0beta03 [December 22, 2011]
   Start-up code size improvements, error handler flexibility. These changes
     alter how the tricky allocation of the initial png_struct and png_info
     structures are handled. png_info is now handled in pretty much the same
     way as everything else, except that the allocations handle NULL return
     silently.  png_struct is changed in a similar way on allocation and on
     deallocation a 'safety' error handler is put in place (which should never
     be required).  The error handler itself is changed to permit mismatches
     in the application and libpng error buffer size; however, this means a
     silent change to the API to return the jmp_buf if the size doesn't match
     the size from the libpng compilation; libpng now allocates the memory and
     this may fail.  Overall these changes result in slight code size
     reductions; however, this is a reduction in code that is always executed
     so is particularly valuable.  Overall on a 64-bit system the libpng DLL
     decreases in code size by 1733 bytes.  pngerror.o increases in size by
     about 465 bytes because of the new functionality.

 Version 1.6.0beta04 [December 30, 2011]
   Regenerated configure scripts with automake-1.11.2
   Eliminated png_info_destroy(). It is now used only in png.c and only calls
     one other internal function and memset().
   Enabled png_get_sCAL_fixed() if floating point APIs are enabled. Previously
     it was disabled whenever internal fixed point arithmetic was selected,
     which meant it didn't exist even on systems where FP was available but not
     preferred.
   Added pngvalid.c compile time checks for const APIs.
   Implemented 'restrict' for png_info and png_struct. Because of the way
     libpng works both png_info and png_struct are always accessed via a
     single pointer.  This means adding C99 'restrict' to the pointer gives
     the compiler some opportunity to optimize the code.  This change allows
     that.
   Moved AC_MSG_CHECKING([if libraries can be versioned]) later to the proper
     location in configure.ac (Gilles Espinasse).
   Changed png_memcpy to C assignment where appropriate. Changed all those
     uses of png_memcpy that were doing a simple assignment to assignments
     (all those cases where the thing being copied is a non-array C L-value).
   Added some error checking to png_set_*() routines.
   Removed the reference to the non-exported function png_memcpy() from
     example.c.
   Fixed the Visual C 64-bit build - it requires jmp_buf to be aligned, but
     it had become misaligned.
   Revised contrib/pngminus/pnm2png.c to avoid warnings when png_uint_32
     and unsigned long are of different sizes.

 Version 1.6.0beta05 [January 15, 2012]
   Updated manual with description of the simplified API (copied from png.h)
   Fix bug in pngerror.c: some long warnings were being improperly truncated
     (bug introduced in libpng-1.5.3beta05).

 Version 1.6.0beta06 [January 24, 2012]
   Added palette support to the simplified APIs. This commit
     changes some of the macro definitions in png.h, app code
     may need corresponding changes.
   Increased the formatted warning buffer to 192 bytes.
   Added color-map support to simplified API. This is an initial version for
     review; the documentation has not yet been updated.
   Fixed Min/GW uninstall to remove libpng.dll.a

 Version 1.6.0beta07 [January 28, 2012]
   Eliminated Intel icc/icl compiler warnings. The Intel (GCC derived)
     compiler issues slightly different warnings from those issued by the
     current vesions of GCC. This eliminates those warnings by
     adding/removing casts and small code rewrites.
   Updated configure.ac from autoupdate: added --enable-werror option.
     Also some layout regularization and removal of introduced tab characters
     (replaced with 3-character indentation).  Obsolete macros identified by
     autoupdate have been removed; the replacements are all in 2.59 so
     the pre-req hasn't been changed.  --enable-werror checks for support
     for -Werror (or the given argument) in the compiler.  This mimics the
     gcc configure option by allowing -Werror to be turned on safely; without
     the option the tests written in configure itself fail compilation because
     they cause compiler warnings.
   Rewrote autogen.sh to run autoreconf instead of running tools one-by-one.
   Conditionalize the install rules for MINGW and CYGWIN in CMakeLists.txt and
     set CMAKE_LIBRARY_OUTPUT_DIRECTORY to "lib" on all platforms (C. Yapp).
   Freeze libtool files in the 'scripts' directory. This version of autogen.sh
     attempts to dissuade people from running it when it is not, or should not,
     be necessary.
   Added two images to contrib/pngsuite (1-bit and 2-bit transparent grayscale),
     and renamed three whose names were inconsistent with those in
     pngsuite/README.txt.

 Version 1.6.0beta08 [January 29, 2012]
   Fixed Image::colormap misalignment in pngstest.c
   Check libtool/libtoolize version number (2.4.2) in configure.ac
   Divide test-pngstest.sh into separate pngstest runs for basic and
     transparent images.
   Moved automake options to AM_INIT_AUTOMAKE in configure.ac
   Added color-tests, silent-rules (Not yet implemented in Makefile.am) and
     version checking to configure.ac
   Improved pngstest speed by not doing redundant tests and add const to
     the background parameter of png_image_finish_read. The --background
     option is now done automagically only when required, so that commandline
     option no longer exists.

 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 1.6.0beta08 - January 29, 2012

	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

	1.6.0beta08.tar.xz (LZMA-compressed, recommended)
	1.6.0beta08.tar.gz
	1.6.0beta08.tar.bz2

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

	lp160b08.7z (LZMA-compressed, recommended)
	lp160b08.zip

	Other information:

	1.6.0beta08-README.txt
	1.6.0beta08-LICENSE.txt

	Changes since the last public release (1.5.7):

	Version 1.6.0beta01 [December 15, 2011]
	Removed machine-generated configure files from the GIT repository (they will
	continue to appear in the tarball distributions).
	Restored the new 'simplified' API, which was started in libpng-1.5.7beta02
	but later deleted from libpng-1.5.7beta05.
	Added example programs for the new 'simplified' API.
	Added ANSI-C (C90) headers and require them, and take advantage of the
	change. Also fixed some of the projects/* and contrib/* files that needed
	updates for libpng16 and the move of pngvalid.c.
	With this change the required ANSI-C header files are assumed to exist: the
	implementation must provide float.h, limits.h, stdarg.h and stddef.h and
	libpng relies on limits.h and stddef.h existing and behaving as defined
	(the other two required headers aren't used). Non-ANSI systems that don't
	have stddef.h or limits.h will have to provide an appropriate fake
	containing the relevant types and #defines.
	The use of FAR/far has been eliminated and the definition of png_alloc_size_t
	is now controlled by a flag so that 'small size_t' systems can select it
	if necessary. Libpng 1.6 may not currently work on such systems -- it
	seems likely that it will ask 'malloc' for more than 65535 bytes with any
	image that has a sufficiently large row size (rather than simply failing
	to read such images).
	New tools directory containing tools used to generate libpng code.
	Fixed race conditions in parallel make builds. With higher degrees of
	parallelism during 'make' the use of the same temporary file names such
	as 'dfn*' can result in a race where a temporary file from one arm of the
	build is deleted or overwritten in another arm. This changes the
	temporary files for suffix rules to always use $* and ensures that the
	non-suffix rules use unique file names.

	Version 1.6.0beta02 [December 21, 2011]
	Correct configure builds where build and source directories are separate.
	The include path of 'config.h' was erroneously made relative in pngvalid.c
	in libpng 1.5.7.

	Version 1.6.0beta03 [December 22, 2011]
	Start-up code size improvements, error handler flexibility. These changes
	alter how the tricky allocation of the initial png_struct and png_info
	structures are handled. png_info is now handled in pretty much the same
	way as everything else, except that the allocations handle NULL return
	silently. png_struct is changed in a similar way on allocation and on
	deallocation a 'safety' error handler is put in place (which should never
	be required). The error handler itself is changed to permit mismatches
	in the application and libpng error buffer size; however, this means a
	silent change to the API to return the jmp_buf if the size doesn't match
	the size from the libpng compilation; libpng now allocates the memory and
	this may fail. Overall these changes result in slight code size
	reductions; however, this is a reduction in code that is always executed
	so is particularly valuable. Overall on a 64-bit system the libpng DLL
	decreases in code size by 1733 bytes. pngerror.o increases in size by
	about 465 bytes because of the new functionality.

	Version 1.6.0beta04 [December 30, 2011]
	Regenerated configure scripts with automake-1.11.2
	Eliminated png_info_destroy(). It is now used only in png.c and only calls
	one other internal function and memset().
	Enabled png_get_sCAL_fixed() if floating point APIs are enabled. Previously
	it was disabled whenever internal fixed point arithmetic was selected,
	which meant it didn't exist even on systems where FP was available but not
	preferred.
	Added pngvalid.c compile time checks for const APIs.
	Implemented 'restrict' for png_info and png_struct. Because of the way
	libpng works both png_info and png_struct are always accessed via a
	single pointer. This means adding C99 'restrict' to the pointer gives
	the compiler some opportunity to optimize the code. This change allows
	that.
	Moved AC_MSG_CHECKING([if libraries can be versioned]) later to the proper
	location in configure.ac (Gilles Espinasse).
	Changed png_memcpy to C assignment where appropriate. Changed all those
	uses of png_memcpy that were doing a simple assignment to assignments
	(all those cases where the thing being copied is a non-array C L-value).
	Added some error checking to png_set_*() routines.
	Removed the reference to the non-exported function png_memcpy() from
	example.c.
	Fixed the Visual C 64-bit build - it requires jmp_buf to be aligned, but
	it had become misaligned.
	Revised contrib/pngminus/pnm2png.c to avoid warnings when png_uint_32
	and unsigned long are of different sizes.

	Version 1.6.0beta05 [January 15, 2012]
	Updated manual with description of the simplified API (copied from png.h)
	Fix bug in pngerror.c: some long warnings were being improperly truncated
	(bug introduced in libpng-1.5.3beta05).

	Version 1.6.0beta06 [January 24, 2012]
	Added palette support to the simplified APIs. This commit
	changes some of the macro definitions in png.h, app code
	may need corresponding changes.
	Increased the formatted warning buffer to 192 bytes.
	Added color-map support to simplified API. This is an initial version for
	review; the documentation has not yet been updated.
	Fixed Min/GW uninstall to remove libpng.dll.a

	Version 1.6.0beta07 [January 28, 2012]
	Eliminated Intel icc/icl compiler warnings. The Intel (GCC derived)
	compiler issues slightly different warnings from those issued by the
	current vesions of GCC. This eliminates those warnings by
	adding/removing casts and small code rewrites.
	Updated configure.ac from autoupdate: added --enable-werror option.
	Also some layout regularization and removal of introduced tab characters
	(replaced with 3-character indentation). Obsolete macros identified by
	autoupdate have been removed; the replacements are all in 2.59 so
	the pre-req hasn't been changed. --enable-werror checks for support
	for -Werror (or the given argument) in the compiler. This mimics the
	gcc configure option by allowing -Werror to be turned on safely; without
	the option the tests written in configure itself fail compilation because
	they cause compiler warnings.
	Rewrote autogen.sh to run autoreconf instead of running tools one-by-one.
	Conditionalize the install rules for MINGW and CYGWIN in CMakeLists.txt and
	set CMAKE_LIBRARY_OUTPUT_DIRECTORY to "lib" on all platforms (C. Yapp).
	Freeze libtool files in the 'scripts' directory. This version of autogen.sh
	attempts to dissuade people from running it when it is not, or should not,
	be necessary.
	Added two images to contrib/pngsuite (1-bit and 2-bit transparent grayscale),
	and renamed three whose names were inconsistent with those in
	pngsuite/README.txt.

	Version 1.6.0beta08 [January 29, 2012]
	Fixed Image::colormap misalignment in pngstest.c
	Check libtool/libtoolize version number (2.4.2) in configure.ac
	Divide test-pngstest.sh into separate pngstest runs for basic and
	transparent images.
	Moved automake options to AM_INIT_AUTOMAKE in configure.ac
	Added color-tests, silent-rules (Not yet implemented in Makefile.am) and
	version checking to configure.ac
	Improved pngstest speed by not doing redundant tests and add const to
	the background parameter of png_image_finish_read. The --background
	option is now done automagically only when required, so that commandline
	option no longer exists.

	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