[master] Imported from libpng-1.6.4.tar

ANNOUNCE

@@ -1,5 +1,5 @@
 
-Libpng 1.6.3 - July 18, 2013
+Libpng 1.6.4 - September 12, 2013
 
 This is a public release of libpng, intended for use in production codes.
 
@@ -8,106 +8,28 @@ Files available for download:
 Source files with LF line endings (for Unix/Linux) and with a
 "configure" script
 
-   libpng-1.6.3.tar.xz (LZMA-compressed, recommended)
-   libpng-1.6.3.tar.gz
+   libpng-1.6.4.tar.xz (LZMA-compressed, recommended)
+   libpng-1.6.4.tar.gz
 
 Source files with CRLF line endings (for Windows), without the
 "configure" script
 
-   lpng163.7z  (LZMA-compressed, recommended)
-   lpng163.zip
+   lpng164.7z  (LZMA-compressed, recommended)
+   lpng164.zip
 
 Other information:
 
-   libpng-1.6.3-README.txt
-   libpng-1.6.3-LICENSE.txt
+   libpng-1.6.4-README.txt
+   libpng-1.6.4-LICENSE.txt
+   Gnupg/*.asc (PGP armored detached signatures)
 
-Changes since the last public release (1.6.2):
-
-  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.
-  Test for 'arm*' not just 'arm' in the host_cpu configure variable.
-  Rebuilt the configure scripts.
-  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).
-  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.
-  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
-  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.
-  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.
-  Renamed contrib/tools/png-fix-too-far-back.c to pngfix.c and revised it
-    to check all compressed chunks known to libpng.
-  Updated documentation to show default behavior of benign errors correctly.
-  Only compile ARM code when PNG_READ_SUPPORTED is defined.
-  Fixed undefined behavior in contrib/tools/pngfix.c and added new strip
-    option. pngfix relied on undefined behavior and even a simple change from
-    gcc to g++ caused it to fail.  The new strip option 'unsafe' has been
-    implemented and is the default if --max is given.  Option names have
-    been clarified, with --strip=transform now stripping the bKGD chunk,
-    which was stripped previously with --strip=unused.
-  Added all documented chunk types to pngpriv.h
-  Unified pngfix.c source with libpng17.
-  Revised manual about changes in iTXt chunk handling made in libpng-1.6.0.
-  Added "/* SAFE */" comments in pngrutil.c and pngrtran.c where warnings
-    may be erroneously issued by code-checking applications.
+Changes since the last public release (1.6.3):
+  Added information about png_set_options() to the manual.
+  Delay calling png_init_filter_functions() until a row with nonzero filter
+    is found.
+  Fixed inconsistent conditional compilation of png_chunk_unknown_handling()
+    prototype, definition, and usage.  Made it depend on
+    PNG_HANDLE_AS_UNKNOWN_SUPPORTED everywhere.
 
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