[libpng15] Imported from libpng-1.5.7beta01.tar

[libpng15] Paeth filter speed improvements from work by Siarhei Siamashka. This
changes the 'Paeth' reconstruction function to improve the GCC code generation on x86. The changes are only part of the suggested ones; just the changes that definitely improve speed and remain simple. The changes also slightly increase the clarity of the code. In a
2025-07-10 18:04:09 +02:00 · 2011-11-04 13:47:49 -05:00 · 2011-11-03 18:31:00 -05:00 · 2011-11-03 18:19:53 -05:00 · 2011-11-03 16:11:08 -05:00 · 2011-11-03 00:49:07 -05:00
57 changed files with 1572 additions and 649 deletions
--- a/76
+++ b/76
@@ -1,5 +1,5 @@

-Libpng 1.5.6beta05 - October 12, 2011
+Libpng 1.5.7beta01 - November 4, 2011

 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.
@@ -9,66 +9,40 @@ Files available for download:
 Source files with LF line endings (for Unix/Linux) and with a
 "configure" script

-   1.5.6beta05.tar.xz (LZMA-compressed, recommended)
-   1.5.6beta05.tar.gz
-   1.5.6beta05.tar.bz2
+   1.5.7beta01.tar.xz (LZMA-compressed, recommended)
+   1.5.7beta01.tar.gz
+   1.5.7beta01.tar.bz2

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

-   lp156b05.7z  (LZMA-compressed, recommended)
-   lp156b05.zip
+   lp157b01.7z  (LZMA-compressed, recommended)
+   lp157b01.zip

 Other information:

-   1.5.6beta05-README.txt
-   1.5.6beta05-LICENSE.txt
+   1.5.7beta01-README.txt
+   1.5.7beta01-LICENSE.txt

-Changes since the last public release (1.5.5):
+Changes since the last public release (1.5.6):

-Version 1.5.6beta01 [September 22, 2011]
-  Fixed some 64-bit type conversion warnings in pngrtran.c
-  Moved row_info from png_struct to a local variable.
-  The various interlace mask arrays have been made into arrays of
-    bytes and made PNG_CONST and static (previously some arrays were
-    marked PNG_CONST and some weren't).
-  Additional checks have been added to the transform code to validate the
-    pixel depths after the transforms on both read and write.
-  Removed some redundant code from pngwrite.c, in png_desgtroy_write_struct().
-  Changed chunk reading/writing code to use png_uint_32 instead of png_byte[4].
-    This removes the need to allocate temporary strings for chunk names on
-    the stack in the read/write code.  Unknown chunk handling still uses the
-    string form because this is exposed in the API.
+Version 1.5.7beta01 [November 4, 2011]
+  Added support for ARM processor (Mans Rullgard)
+  Fixed bug in pngvalid on early allocation failure; fixed type cast in
+    pngmem.c; pngvalid would attempt to call png_error() if the allocation
+    of a png_struct or png_info failed. This would probably have led to a
+    crash.  The pngmem.c implementation of png_malloc() included a cast
+    to png_size_t which would fail on large allocations on 16-bit systems.
+  Fix for the preprocessor of the Intel C compiler. The preprocessor
+    splits adjacent @ signs with a space; this changes the concatentation
+    token from @@@ to PNG_JOIN; that should work with all compiler
+    preprocessors.
+  Paeth filter speed improvements from work by Siarhei Siamashka. This
+    changes the 'Paeth' reconstruction function to improve the GCC code
+    generation on x86. The changes are only part of the suggested ones;
+    just the changes that definitely improve speed and remain simple.
+    The changes also slightly increase the clarity of the code. In a

-Version 1.5.6beta02 [September 26, 2011]
-  Added a note in the manual the png_read_update_info() must be called only
-    once with a particular info_ptr.
-  Fixed a typo in the definition of the new PNG_STRING_FROM_CHUNK(s,c) macro.
-
-Version 1.5.6beta03 [September 28, 2011]
-  Revised test-pngtest.sh to report FAIL when pngtest fails.
-  Added "--strict" option to pngtest, to report FAIL when the failure is
-    only because the resulting valid files are different.
-  Revised CMakeLists.txt to work with mingw and removed some material from
-    CMakeLists.txt that is no longer useful in libpng-1.5.
-
-Version 1.5.6beta04 [October 5, 2011]
-  Fixed typo in Makefile.in and Makefile.am ("-M Wl" should be "-M -Wl")."
-
-Version 1.5.6beta05 [October 12, 2011]
-  Speed up png_combine_row() for interlaced images. This reduces the generality
-    of the code, allowing it to be optimized for Adam7 interlace.  The masks
-    passed to png_combine_row() are now generated internally, avoiding
-    some code duplication and localizing the interlace handling somewhat.
-  Align png_struct::row_buf - previously it was always unaligned, caused by
-    a bug in the code that attempted to align it; the code needs to subtract
-    one from the pointer to take account of the filter byte prepended to
-    each row.
-  Optimized png_combine_row() when rows are aligned. This gains a small
-    percentage for 16-bit and 32-bit pixels in the typical case where the
-    output row buffers are appropriately aligned. The optimization was not
-    previously possible because the png_struct buffer was always misaligned.
-  Fixed bug in png_write_chunk_header() debug print, introduced in 1.5.6bet01.

 Send comments/corrections/commendations to png-mng-implement at lists.sf.net:
 (subscription required; visit
--- a/57
+++ b/57
@@ -3629,7 +3629,62 @@ Version 1.5.6beta05 [October 12, 2011]
    percentage for 16-bit and 32-bit pixels in the typical case where the
    output row buffers are appropriately aligned. The optimization was not
    previously possible because the png_struct buffer was always misaligned.
-  Fixed bug in png_write_chunk_header() debug print, introduced in 1.5.6bet01.
+  Fixed bug in png_write_chunk_header() debug print, introduced in 1.5.6beta01.
+
+Version 1.5.6beta06 [October 17, 2011]
+  Removed two redundant tests for unitialized row.
+  Fixed a relatively harmless memory overwrite in compressed text writing
+    with a 1 byte zlib buffer.
+  Add ability to call png_read_update_info multiple times to pngvalid.c.
+  Fixes for multiple calls to png_read_update_info. These fixes attend to
+    most of the errors revealed in pngvalid, however doing the gamma work
+    twice results in inaccuracies that can't be easily fixed.  There is now
+    a warning in the code if this is going to happen.
+  Turned on multiple png_read_update_info in pngvalid transform tests.
+  Prevent libpng from overwriting unused bits at the end of the image when
+    it is not byte aligned, while reading. Prior to libpng-1.5.6 libpng would
+    overwrite the partial byte at the end of each row if the row width was not
+    an exact multiple of 8 bits and the image is not interlaced.
+
+Version 1.5.6beta07 [October 21, 2011]
+  Made png_ptr->prev_row an aligned pointer into png_ptr->big_prev_row
+    (Mans Rullgard).
+
+Version 1.5.6rc01 [October 26, 2011]
+  Changed misleading "Missing PLTE before cHRM" warning to "Out of place cHRM"
+
+Version 1.5.6rc02 [October 27, 2011]
+  Added LSR() macro to defend against buggy compilers that evaluate non-taken
+    code branches and complain about out-of-range shifts. 
+
+Version 1.5.6rc03 [October 28, 2011]
+  Renamed the LSR() macro to PNG_LSR() and added PNG_LSL() macro.
+  Fixed compiler warnings with Intel and MSYS compilers. The logical shift
+    fix for Microsoft Visual C is required by other compilers, so this
+    enables that fix for all compilers when using compile-time constants.
+    Under MSYS 'byte' is a name declared in a system header file, so we
+    changed the name of a local variable to avoid the warnings that result.
+  Added #define PNG_ALIGN_TYPE PNG_ALIGN_NONE to contrib/pngminim/*/pngusr.h
+
+Version 1.5.6 [November 3, 2011]
+  No changes.
+
+Version 1.5.7beta01 [November 4, 2011]
+  Added support for ARM processor (Mans Rullgard)
+  Fixed bug in pngvalid on early allocation failure; fixed type cast in
+    pngmem.c; pngvalid would attempt to call png_error() if the allocation
+    of a png_struct or png_info failed. This would probably have led to a
+    crash.  The pngmem.c implementation of png_malloc() included a cast
+    to png_size_t which would fail on large allocations on 16-bit systems.
+  Fix for the preprocessor of the Intel C compiler. The preprocessor
+    splits adjacent @ signs with a space; this changes the concatentation
+    token from @@@ to PNG_JOIN; that should work with all compiler
+    preprocessors.
+  Paeth filter speed improvements from work by Siarhei Siamashka. This
+    changes the 'Paeth' reconstruction function to improve the GCC code
+    generation on x86. The changes are only part of the suggested ones;
+    just the changes that definitely improve speed and remain simple.
+    The changes also slightly increase the clarity of the code. In a

 Send comments/corrections/commendations to png-mng-implement at lists.sf.net
 (subscription required; visit
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -35,7 +35,7 @@ enable_testing()

 set(PNGLIB_MAJOR 1)
 set(PNGLIB_MINOR 5)
-set(PNGLIB_RELEASE 6)
+set(PNGLIB_RELEASE 7)
 set(PNGLIB_NAME libpng${PNGLIB_MAJOR}${PNGLIB_MINOR})
 set(PNGLIB_VERSION ${PNGLIB_MAJOR}.${PNGLIB_MINOR}.${PNGLIB_RELEASE})

@@ -229,7 +229,7 @@ endif(NOT WIN32 OR CYGWIN)
 # SET UP LINKS
 if(PNG_SHARED)
  set_target_properties(${PNG_LIB_NAME} PROPERTIES
-#   VERSION 15.${PNGLIB_RELEASE}.1.5.6beta05
+#   VERSION 15.${PNGLIB_RELEASE}.1.5.7beta01
    VERSION 15.${PNGLIB_RELEASE}.0
    SOVERSION 15
    CLEAN_DIRECT_OUTPUT 1)
--- a/4
+++ b/4
@@ -10,7 +10,7 @@ this sentence.

 This code is released under the libpng license.

-libpng versions 1.2.6, August 15, 2004, through 1.5.6beta05, October 12, 2011, are
+libpng versions 1.2.6, August 15, 2004, through 1.5.7beta01, November 4, 2011, are
 Copyright (c) 2004, 2006-2011 Glenn Randers-Pehrson, and are
 distributed according to the same disclaimer and license as libpng-1.2.5
 with the following individual added to the list of Contributing Authors
@@ -108,4 +108,4 @@ certification mark of the Open Source Initiative.

 Glenn Randers-Pehrson
 glennrp at users.sourceforge.net
-October 12, 2011
+November 4, 2011
--- a/Makefile.am
+++ b/Makefile.am
@@ -36,6 +36,10 @@ libpng@PNGLIB_MAJOR@@PNGLIB_MINOR@_la_SOURCES = png.c pngerror.c\
 	pngset.c pngtrans.c pngwio.c pngwrite.c pngwtran.c pngwutil.c\
 	png.h pngconf.h pngdebug.h pnginfo.h pngpriv.h pngstruct.h

+if PNG_ARM_NEON
+libpng@PNGLIB_MAJOR@@PNGLIB_MINOR@_la_SOURCES += arm/filter_neon.S
+endif
+
 nodist_libpng@PNGLIB_MAJOR@@PNGLIB_MINOR@_la_SOURCES = pnglibconf.h

 libpng@PNGLIB_MAJOR@@PNGLIB_MINOR@_la_CPPFLAGS = @LIBPNG_DEFINES@
@@ -138,9 +142,9 @@ SYMBOL_CFLAGS = -DPNGLIB_LIBNAME='PNG@PNGLIB_MAJOR@@PNGLIB_MINOR@_0'\
 	echo '#include "$<"' >dfn.c
 	$(DFNCPP) $(DEFS) $(DEFAULT_INCLUDES) $(INCLUDES) @LIBPNG_DEFINES@\
 	    $(CPPFLAGS) $(SYMBOL_CFLAGS) dfn.c > dfn1.out
-	$(SED) -n -e 's|^.*PNG_DEFN_MAGIC-\(.*\)-PNG_DEFN_END.*$$|\1|p'\
+	$(SED) -n -e 's|^.*PNG_DEFN_MAGIC *-\(.*\)- *PNG_DEFN_END.*$$|\1|p'\
 	    dfn1.out >dfn2.out
-	$(SED) -e 's| *@@@ *||g' -e 's| *$$||' dfn2.out >dfn3.out
+	$(SED) -e 's| *PNG_JOIN *||g' -e 's| *$$||' dfn2.out >dfn3.out
 	rm -f dfn.c dfn[12].out
 	mv dfn3.out $@

--- a/Makefile.in
+++ b/Makefile.in
@@ -41,12 +41,13 @@ POST_UNINSTALL = :
 build_triplet = @build@
 host_triplet = @host@
 check_PROGRAMS = pngtest$(EXEEXT) pngvalid$(EXEEXT)
+@PNG_ARM_NEON_TRUE@am__append_1 = arm/filter_neon.S

 #   Versioned symbols and restricted exports
-@HAVE_LD_VERSION_SCRIPT_TRUE@@HAVE_SOLARIS_LD_TRUE@am__append_1 = -Wl,-M -Wl,libpng.vers
-@HAVE_LD_VERSION_SCRIPT_TRUE@@HAVE_SOLARIS_LD_FALSE@am__append_2 = -Wl,--version-script=libpng.vers
+@HAVE_LD_VERSION_SCRIPT_TRUE@@HAVE_SOLARIS_LD_TRUE@am__append_2 = -Wl,-M -Wl,libpng.vers
+@HAVE_LD_VERSION_SCRIPT_TRUE@@HAVE_SOLARIS_LD_FALSE@am__append_3 = -Wl,--version-script=libpng.vers
 #   Only restricted exports when possible
-@HAVE_LD_VERSION_SCRIPT_FALSE@am__append_3 = -export-symbols libpng.sym
+@HAVE_LD_VERSION_SCRIPT_FALSE@am__append_4 = -export-symbols libpng.sym
 subdir = .
 DIST_COMMON = README $(am__configure_deps) $(dist_man_MANS) \
 	$(pkginclude_HEADERS) $(srcdir)/Makefile.am \
@@ -91,6 +92,12 @@ am__installdirs = "$(DESTDIR)$(libdir)" "$(DESTDIR)$(bindir)" \
 	"$(DESTDIR)$(pkgincludedir)"
 LTLIBRARIES = $(lib_LTLIBRARIES)
 libpng@PNGLIB_MAJOR@@PNGLIB_MINOR@_la_LIBADD =
+am__libpng@PNGLIB_MAJOR@@PNGLIB_MINOR@_la_SOURCES_DIST = png.c \
+	pngerror.c pngget.c pngmem.c pngpread.c pngread.c pngrio.c \
+	pngrtran.c pngrutil.c pngset.c pngtrans.c pngwio.c pngwrite.c \
+	pngwtran.c pngwutil.c png.h pngconf.h pngdebug.h pnginfo.h \
+	pngpriv.h pngstruct.h arm/filter_neon.S
+@PNG_ARM_NEON_TRUE@am__objects_1 = libpng@PNGLIB_MAJOR@@PNGLIB_MINOR@_la-filter_neon.lo
 am_libpng@PNGLIB_MAJOR@@PNGLIB_MINOR@_la_OBJECTS =  \
 	libpng@PNGLIB_MAJOR@@PNGLIB_MINOR@_la-png.lo \
 	libpng@PNGLIB_MAJOR@@PNGLIB_MINOR@_la-pngerror.lo \
@@ -106,7 +113,8 @@ am_libpng@PNGLIB_MAJOR@@PNGLIB_MINOR@_la_OBJECTS =  \
 	libpng@PNGLIB_MAJOR@@PNGLIB_MINOR@_la-pngwio.lo \
 	libpng@PNGLIB_MAJOR@@PNGLIB_MINOR@_la-pngwrite.lo \
 	libpng@PNGLIB_MAJOR@@PNGLIB_MINOR@_la-pngwtran.lo \
-	libpng@PNGLIB_MAJOR@@PNGLIB_MINOR@_la-pngwutil.lo
+	libpng@PNGLIB_MAJOR@@PNGLIB_MINOR@_la-pngwutil.lo \
+	$(am__objects_1)
 nodist_libpng@PNGLIB_MAJOR@@PNGLIB_MINOR@_la_OBJECTS =
 libpng@PNGLIB_MAJOR@@PNGLIB_MINOR@_la_OBJECTS =  \
 	$(am_libpng@PNGLIB_MAJOR@@PNGLIB_MINOR@_la_OBJECTS) \
@@ -127,6 +135,11 @@ DEFAULT_INCLUDES = -I.@am__isrc@
 depcomp = $(SHELL) $(top_srcdir)/depcomp
 am__depfiles_maybe = depfiles
 am__mv = mv -f
+CPPASCOMPILE = $(CCAS) $(DEFS) $(DEFAULT_INCLUDES) $(INCLUDES) \
+	$(AM_CPPFLAGS) $(CPPFLAGS) $(AM_CCASFLAGS) $(CCASFLAGS)
+LTCPPASCOMPILE = $(LIBTOOL) $(AM_LIBTOOLFLAGS) $(LIBTOOLFLAGS) \
+	--mode=compile $(CCAS) $(DEFS) $(DEFAULT_INCLUDES) $(INCLUDES) \
+	$(AM_CPPFLAGS) $(CPPFLAGS) $(AM_CCASFLAGS) $(CCASFLAGS)
 COMPILE = $(CC) $(DEFS) $(DEFAULT_INCLUDES) $(INCLUDES) $(AM_CPPFLAGS) \
 	$(CPPFLAGS) $(AM_CFLAGS) $(CFLAGS)
 LTCOMPILE = $(LIBTOOL) --tag=CC $(AM_LIBTOOLFLAGS) $(LIBTOOLFLAGS) \
@@ -139,7 +152,8 @@ LINK = $(LIBTOOL) --tag=CC $(AM_LIBTOOLFLAGS) $(LIBTOOLFLAGS) \
 SOURCES = $(libpng@PNGLIB_MAJOR@@PNGLIB_MINOR@_la_SOURCES) \
 	$(nodist_libpng@PNGLIB_MAJOR@@PNGLIB_MINOR@_la_SOURCES) \
 	$(pngtest_SOURCES) $(pngvalid_SOURCES)
-DIST_SOURCES = $(libpng@PNGLIB_MAJOR@@PNGLIB_MINOR@_la_SOURCES) \
+DIST_SOURCES =  \
+	$(am__libpng@PNGLIB_MAJOR@@PNGLIB_MINOR@_la_SOURCES_DIST) \
 	$(pngtest_SOURCES) $(pngvalid_SOURCES)
 man3dir = $(mandir)/man3
 man5dir = $(mandir)/man5
@@ -174,6 +188,9 @@ AUTOHEADER = @AUTOHEADER@
 AUTOMAKE = @AUTOMAKE@
 AWK = @AWK@
 CC = @CC@
+CCAS = @CCAS@
+CCASDEPMODE = @CCASDEPMODE@
+CCASFLAGS = @CCASFLAGS@
 CCDEPMODE = @CCDEPMODE@
 CFLAGS = @CFLAGS@
 CPP = @CPP@
@@ -324,17 +341,17 @@ bin_SCRIPTS = @binconfigs@
 # rules to build libpng, only build the old library on request
 lib_LTLIBRARIES = libpng@PNGLIB_MAJOR@@PNGLIB_MINOR@.la
 # EXTRA_LTLIBRARIES= libpng.la
-libpng@PNGLIB_MAJOR@@PNGLIB_MINOR@_la_SOURCES = png.c pngerror.c\
-	pngget.c pngmem.c pngpread.c pngread.c pngrio.c pngrtran.c pngrutil.c\
-	pngset.c pngtrans.c pngwio.c pngwrite.c pngwtran.c pngwutil.c\
-	png.h pngconf.h pngdebug.h pnginfo.h pngpriv.h pngstruct.h
-
+libpng@PNGLIB_MAJOR@@PNGLIB_MINOR@_la_SOURCES = png.c pngerror.c \
+	pngget.c pngmem.c pngpread.c pngread.c pngrio.c pngrtran.c \
+	pngrutil.c pngset.c pngtrans.c pngwio.c pngwrite.c pngwtran.c \
+	pngwutil.c png.h pngconf.h pngdebug.h pnginfo.h pngpriv.h \
+	pngstruct.h $(am__append_1)
 nodist_libpng@PNGLIB_MAJOR@@PNGLIB_MINOR@_la_SOURCES = pnglibconf.h
 libpng@PNGLIB_MAJOR@@PNGLIB_MINOR@_la_CPPFLAGS = @LIBPNG_DEFINES@
 libpng@PNGLIB_MAJOR@@PNGLIB_MINOR@_la_LDFLAGS = -no-undefined \
 	-export-dynamic -version-number \
 	@PNGLIB_MAJOR@@PNGLIB_MINOR@:@PNGLIB_RELEASE@:0 \
-	$(am__append_1) $(am__append_2) $(am__append_3)
+	$(am__append_2) $(am__append_3) $(am__append_4)
@HAVE_LD_VERSION_SCRIPT_FALSE@libpng@PNGLIB_MAJOR@@PNGLIB_MINOR@_la_DEPENDENCIES = libpng.sym
@HAVE_LD_VERSION_SCRIPT_TRUE@libpng@PNGLIB_MAJOR@@PNGLIB_MINOR@_la_DEPENDENCIES = libpng.vers
 pkginclude_HEADERS = png.h pngconf.h
@@ -372,7 +389,7 @@ all: config.h
 	$(MAKE) $(AM_MAKEFLAGS) all-am

 .SUFFIXES:
-.SUFFIXES: .chk .dfn .out .c .lo .o .obj
+.SUFFIXES: .chk .dfn .out .S .c .lo .o .obj
 am--refresh:
 	@:
 $(srcdir)/Makefile.in: @MAINTAINER_MODE_TRUE@ $(srcdir)/Makefile.am  $(am__configure_deps)
@@ -517,6 +534,7 @@ mostlyclean-compile:
 distclean-compile:
 	-rm -f *.tab.c

+@AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/libpng@PNGLIB_MAJOR@@PNGLIB_MINOR@_la-filter_neon.Plo@am__quote@
@AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/libpng@PNGLIB_MAJOR@@PNGLIB_MINOR@_la-png.Plo@am__quote@
@AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/libpng@PNGLIB_MAJOR@@PNGLIB_MINOR@_la-pngerror.Plo@am__quote@
@AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/libpng@PNGLIB_MAJOR@@PNGLIB_MINOR@_la-pngget.Plo@am__quote@
@@ -535,6 +553,34 @@ distclean-compile:
@AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/pngtest.Po@am__quote@
@AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/pngvalid.Po@am__quote@

+.S.o:
+@am__fastdepCCAS_TRUE@	$(CPPASCOMPILE) -MT $@ -MD -MP -MF $(DEPDIR)/$*.Tpo -c -o $@ $<
+@am__fastdepCCAS_TRUE@	$(am__mv) $(DEPDIR)/$*.Tpo $(DEPDIR)/$*.Po
+@AMDEP_TRUE@@am__fastdepCCAS_FALSE@	source='$<' object='$@' libtool=no @AMDEPBACKSLASH@
+@AMDEP_TRUE@@am__fastdepCCAS_FALSE@	DEPDIR=$(DEPDIR) $(CCASDEPMODE) $(depcomp) @AMDEPBACKSLASH@
+@am__fastdepCCAS_FALSE@	$(CPPASCOMPILE) -c -o $@ $<
+
+.S.obj:
+@am__fastdepCCAS_TRUE@	$(CPPASCOMPILE) -MT $@ -MD -MP -MF $(DEPDIR)/$*.Tpo -c -o $@ `$(CYGPATH_W) '$<'`
+@am__fastdepCCAS_TRUE@	$(am__mv) $(DEPDIR)/$*.Tpo $(DEPDIR)/$*.Po
+@AMDEP_TRUE@@am__fastdepCCAS_FALSE@	source='$<' object='$@' libtool=no @AMDEPBACKSLASH@
+@AMDEP_TRUE@@am__fastdepCCAS_FALSE@	DEPDIR=$(DEPDIR) $(CCASDEPMODE) $(depcomp) @AMDEPBACKSLASH@
+@am__fastdepCCAS_FALSE@	$(CPPASCOMPILE) -c -o $@ `$(CYGPATH_W) '$<'`
+
+.S.lo:
+@am__fastdepCCAS_TRUE@	$(LTCPPASCOMPILE) -MT $@ -MD -MP -MF $(DEPDIR)/$*.Tpo -c -o $@ $<
+@am__fastdepCCAS_TRUE@	$(am__mv) $(DEPDIR)/$*.Tpo $(DEPDIR)/$*.Plo
+@AMDEP_TRUE@@am__fastdepCCAS_FALSE@	source='$<' object='$@' libtool=yes @AMDEPBACKSLASH@
+@AMDEP_TRUE@@am__fastdepCCAS_FALSE@	DEPDIR=$(DEPDIR) $(CCASDEPMODE) $(depcomp) @AMDEPBACKSLASH@
+@am__fastdepCCAS_FALSE@	$(LTCPPASCOMPILE) -c -o $@ $<
+
+libpng@PNGLIB_MAJOR@@PNGLIB_MINOR@_la-filter_neon.lo: arm/filter_neon.S
+@am__fastdepCCAS_TRUE@	$(LIBTOOL)  $(AM_LIBTOOLFLAGS) $(LIBTOOLFLAGS) --mode=compile $(CCAS) $(DEFS) $(DEFAULT_INCLUDES) $(INCLUDES) $(libpng@PNGLIB_MAJOR@@PNGLIB_MINOR@_la_CPPFLAGS) $(CPPFLAGS) $(AM_CCASFLAGS) $(CCASFLAGS) -MT libpng@PNGLIB_MAJOR@@PNGLIB_MINOR@_la-filter_neon.lo -MD -MP -MF $(DEPDIR)/libpng@PNGLIB_MAJOR@@PNGLIB_MINOR@_la-filter_neon.Tpo -c -o libpng@PNGLIB_MAJOR@@PNGLIB_MINOR@_la-filter_neon.lo `test -f 'arm/filter_neon.S' || echo '$(srcdir)/'`arm/filter_neon.S
+@am__fastdepCCAS_TRUE@	$(am__mv) $(DEPDIR)/libpng@PNGLIB_MAJOR@@PNGLIB_MINOR@_la-filter_neon.Tpo $(DEPDIR)/libpng@PNGLIB_MAJOR@@PNGLIB_MINOR@_la-filter_neon.Plo
+@AMDEP_TRUE@@am__fastdepCCAS_FALSE@	source='arm/filter_neon.S' object='libpng@PNGLIB_MAJOR@@PNGLIB_MINOR@_la-filter_neon.lo' libtool=yes @AMDEPBACKSLASH@
+@AMDEP_TRUE@@am__fastdepCCAS_FALSE@	DEPDIR=$(DEPDIR) $(CCASDEPMODE) $(depcomp) @AMDEPBACKSLASH@
+@am__fastdepCCAS_FALSE@	$(LIBTOOL)  $(AM_LIBTOOLFLAGS) $(LIBTOOLFLAGS) --mode=compile $(CCAS) $(DEFS) $(DEFAULT_INCLUDES) $(INCLUDES) $(libpng@PNGLIB_MAJOR@@PNGLIB_MINOR@_la_CPPFLAGS) $(CPPFLAGS) $(AM_CCASFLAGS) $(CCASFLAGS) -c -o libpng@PNGLIB_MAJOR@@PNGLIB_MINOR@_la-filter_neon.lo `test -f 'arm/filter_neon.S' || echo '$(srcdir)/'`arm/filter_neon.S
+
 .c.o:
@am__fastdepCC_TRUE@	$(COMPILE) -MT $@ -MD -MP -MF $(DEPDIR)/$*.Tpo -c -o $@ $<
@am__fastdepCC_TRUE@	$(am__mv) $(DEPDIR)/$*.Tpo $(DEPDIR)/$*.Po
@@ -1294,9 +1340,9 @@ pngvalid.o pngtest.o: pnglibconf.h
 	echo '#include "$<"' >dfn.c
 	$(DFNCPP) $(DEFS) $(DEFAULT_INCLUDES) $(INCLUDES) @LIBPNG_DEFINES@\
 	    $(CPPFLAGS) $(SYMBOL_CFLAGS) dfn.c > dfn1.out
-	$(SED) -n -e 's|^.*PNG_DEFN_MAGIC-\(.*\)-PNG_DEFN_END.*$$|\1|p'\
+	$(SED) -n -e 's|^.*PNG_DEFN_MAGIC *-\(.*\)- *PNG_DEFN_END.*$$|\1|p'\
 	    dfn1.out >dfn2.out
-	$(SED) -e 's| *@@@ *||g' -e 's| *$$||' dfn2.out >dfn3.out
+	$(SED) -e 's| *PNG_JOIN *||g' -e 's| *$$||' dfn2.out >dfn3.out
 	rm -f dfn.c dfn[12].out
 	mv dfn3.out $@

--- a/2
+++ b/2
@@ -1,4 +1,4 @@
-README for libpng version 1.5.6beta05 - October 12, 2011 (shared library 15.0)
+README for libpng version 1.5.7beta01 - November 4, 2011 (shared library 15.0)
 See the note about version numbers near the top of png.h

 See INSTALL for instructions on how to install libpng.
--- a/aclocal.m4
+++ b/aclocal.m4
@@ -2436,7 +2436,14 @@ freebsd* | dragonfly*)
    *) objformat=elf ;;
    esac
  fi
-  version_type=freebsd-$objformat
+  # Handle Gentoo/FreeBSD as it was Linux
+  case $host_vendor in
+    gentoo)
+      version_type=linux ;;
+    *)
+      version_type=freebsd-$objformat ;;
+  esac
+
  case $version_type in
    freebsd-elf*)
      library_names_spec='${libname}${release}${shared_ext}$versuffix ${libname}${release}${shared_ext} $libname${shared_ext}'
@@ -2447,6 +2454,12 @@ freebsd* | dragonfly*)
      library_names_spec='${libname}${release}${shared_ext}$versuffix $libname${shared_ext}$versuffix'
      need_version=yes
      ;;
+    linux)
+      library_names_spec='${libname}${release}${shared_ext}$versuffix ${libname}${release}${shared_ext}$major ${libname}${shared_ext}'
+      soname_spec='${libname}${release}${shared_ext}$major'
+      need_lib_prefix=no
+      need_version=no
+      ;;
  esac
  shlibpath_var=LD_LIBRARY_PATH
  case $host_os in
@@ -8482,6 +8495,28 @@ m4_ifndef([AC_AUTOCONF_VERSION],
  [m4_copy([m4_PACKAGE_VERSION], [AC_AUTOCONF_VERSION])])dnl
 _AM_AUTOCONF_VERSION(m4_defn([AC_AUTOCONF_VERSION]))])

+# Figure out how to run the assembler.                      -*- Autoconf -*-
+
+# Copyright (C) 2001, 2003, 2004, 2005, 2006  Free Software Foundation, Inc.
+#
+# This file is free software; the Free Software Foundation
+# gives unlimited permission to copy and/or distribute it,
+# with or without modifications, as long as this notice is preserved.
+
+# serial 5
+
+# AM_PROG_AS
+# ----------
+AC_DEFUN([AM_PROG_AS],
+[# By default we simply use the C compiler to build assembly code.
+AC_REQUIRE([AC_PROG_CC])
+test "${CCAS+set}" = set || CCAS=$CC
+test "${CCASFLAGS+set}" = set || CCASFLAGS=$CFLAGS
+AC_ARG_VAR([CCAS],      [assembler compiler command (defaults to CC)])
+AC_ARG_VAR([CCASFLAGS], [assembler compiler flags (defaults to CFLAGS)])
+_AM_IF_OPTION([no-dependencies],, [_AM_DEPENDENCIES([CCAS])])dnl
+])
+
 # AM_AUX_DIR_EXPAND                                         -*- Autoconf -*-

 # Copyright (C) 2001, 2003, 2005  Free Software Foundation, Inc.
--- a/arm/filter_neon.S
+++ b/arm/filter_neon.S
@@ -0,0 +1,220 @@
+
+/* filter_neon.S - NEON optimised filter functions
+ *
+ * Copyright (c) 2011 Mans Rullgard
+ *
+ * This code is released under the libpng license.
+ * For conditions of distribution and use, see the disclaimer
+ * and license in png.h
+ */
+
+#ifdef __ELF__
+#   define ELF
+#else
+#   define ELF @
+#endif
+
+        .arch armv7-a
+        .fpu  neon
+
+.macro  func    name, export=0
+    .macro endfunc
+ELF     .size   \name, . - \name
+        .endfunc
+        .purgem endfunc
+    .endm
+        .text
+    .if \export
+        .global \name
+    .endif
+ELF     .type   \name, STT_FUNC
+        .func   \name
+\name:
+.endm
+
+func    png_read_filter_row_sub4_neon, export=1
+        ldr             r3,  [r0, #4]           @ rowbytes
+        vmov.i8         d3,  #0
+1:
+        vld4.32         {d4[],d5[],d6[],d7[]},    [r1,:128]
+        vadd.u8         d0,  d3,  d4
+        vadd.u8         d1,  d0,  d5
+        vadd.u8         d2,  d1,  d6
+        vadd.u8         d3,  d2,  d7
+        vst4.32         {d0[0],d1[0],d2[0],d3[0]},[r1,:128]!
+        subs            r3,  r3,  #16
+        bgt             1b
+
+        bx              lr
+endfunc
+
+func    png_read_filter_row_sub3_neon, export=1
+        ldr             r3,  [r0, #4]           @ rowbytes
+        vmov.i8         d3,  #0
+        mov             r0,  r1
+        mov             r2,  #3
+        mov             r12, #12
+        vld1.8          {q11},    [r0], r12
+1:
+        vext.8          d5,  d22, d23, #3
+        vadd.u8         d0,  d3,  d22
+        vext.8          d6,  d22, d23, #6
+        vadd.u8         d1,  d0,  d5
+        vext.8          d7,  d23, d23, #1
+        vld1.8          {q11},    [r0], r12
+        vst1.32         {d0[0]},  [r1,:32], r2
+        vadd.u8         d2,  d1,  d6
+        vst1.32         {d1[0]},  [r1], r2
+        vadd.u8         d3,  d2,  d7
+        vst1.32         {d2[0]},  [r1], r2
+        vst1.32         {d3[0]},  [r1], r2
+        subs            r3,  r3,  #12
+        bgt             1b
+
+        bx              lr
+endfunc
+
+func    png_read_filter_row_up_neon, export=1
+        ldr             r3,  [r0, #4]           @ rowbytes
+1:
+        vld1.8          {q0}, [r1,:128]
+        vld1.8          {q1}, [r2,:128]!
+        vadd.u8         q0,  q0,  q1
+        vst1.8          {q0}, [r1,:128]!
+        subs            r3,  r3,  #16
+        bgt             1b
+
+        bx              lr
+endfunc
+
+func    png_read_filter_row_avg4_neon, export=1
+        ldr             r12, [r0, #4]           @ rowbytes
+        vmov.i8         d3,  #0
+1:
+        vld4.32         {d4[],d5[],d6[],d7[]},    [r1,:128]
+        vld4.32         {d16[],d17[],d18[],d19[]},[r2,:128]!
+        vhadd.u8        d0,  d3,  d16
+        vadd.u8         d0,  d0,  d4
+        vhadd.u8        d1,  d0,  d17
+        vadd.u8         d1,  d1,  d5
+        vhadd.u8        d2,  d1,  d18
+        vadd.u8         d2,  d2,  d6
+        vhadd.u8        d3,  d2,  d19
+        vadd.u8         d3,  d3,  d7
+        vst4.32         {d0[0],d1[0],d2[0],d3[0]},[r1,:128]!
+        subs            r12, r12, #16
+        bgt             1b
+
+        bx              lr
+endfunc
+
+func    png_read_filter_row_avg3_neon, export=1
+        push            {r4,lr}
+        ldr             r12, [r0, #4]           @ rowbytes
+        vmov.i8         d3,  #0
+        mov             r0,  r1
+        mov             r4,  #3
+        mov             lr,  #12
+        vld1.8          {q11},    [r0], lr
+1:
+        vld1.8          {q10},    [r2], lr
+        vext.8          d5,  d22, d23, #3
+        vhadd.u8        d0,  d3,  d20
+        vext.8          d17, d20, d21, #3
+        vadd.u8         d0,  d0,  d22
+        vext.8          d6,  d22, d23, #6
+        vhadd.u8        d1,  d0,  d17
+        vext.8          d18, d20, d21, #6
+        vadd.u8         d1,  d1,  d5
+        vext.8          d7,  d23, d23, #1
+        vld1.8          {q11},    [r0], lr
+        vst1.32         {d0[0]},  [r1,:32], r4
+        vhadd.u8        d2,  d1,  d18
+        vst1.32         {d1[0]},  [r1], r4
+        vext.8          d19, d21, d21, #1
+        vadd.u8         d2,  d2,  d6
+        vhadd.u8        d3,  d2,  d19
+        vst1.32         {d2[0]},  [r1], r4
+        vadd.u8         d3,  d3,  d7
+        vst1.32         {d3[0]},  [r1], r4
+        subs            r12, r12, #12
+        bgt             1b
+
+        pop             {r4,pc}
+endfunc
+
+.macro  paeth           rx,  ra,  rb,  rc
+        vaddl.u8        q12, \ra, \rb           @ a + b
+        vaddl.u8        q15, \rc, \rc           @ 2*c
+        vabdl.u8        q13, \rb, \rc           @ pa
+        vabdl.u8        q14, \ra, \rc           @ pb
+        vabd.u16        q15, q12, q15           @ pc
+        vcle.u16        q12, q13, q14           @ pa <= pb
+        vcle.u16        q13, q13, q15           @ pa <= pc
+        vcle.u16        q14, q14, q15           @ pb <= pc
+        vand            q12, q12, q13           @ pa <= pb && pa <= pc
+        vmovn.u16       d28, q14
+        vmovn.u16       \rx, q12
+        vbsl            d28, \rb, \rc
+        vbsl            \rx, \ra, d28
+.endm
+
+func    png_read_filter_row_paeth4_neon, export=1
+        ldr             r12, [r0, #4]           @ rowbytes
+        vmov.i8         d3,  #0
+        vmov.i8         d20, #0
+1:
+        vld4.32         {d4[],d5[],d6[],d7[]},    [r1,:128]
+        vld4.32         {d16[],d17[],d18[],d19[]},[r2,:128]!
+        paeth           d0,  d3,  d16, d20
+        vadd.u8         d0,  d0,  d4
+        paeth           d1,  d0,  d17, d16
+        vadd.u8         d1,  d1,  d5
+        paeth           d2,  d1,  d18, d17
+        vadd.u8         d2,  d2,  d6
+        paeth           d3,  d2,  d19, d18
+        vmov            d20, d19
+        vadd.u8         d3,  d3,  d7
+        vst4.32         {d0[0],d1[0],d2[0],d3[0]},[r1,:128]!
+        subs            r12, r12, #16
+        bgt             1b
+
+        bx              lr
+endfunc
+
+func    png_read_filter_row_paeth3_neon, export=1
+        push            {r4,lr}
+        ldr             r12, [r0, #4]           @ rowbytes
+        vmov.i8         d3,  #0
+        vmov.i8         d4,  #0
+        mov             r0,  r1
+        mov             r4,  #3
+        mov             lr,  #12
+        vld1.8          {q11},    [r0], lr
+1:
+        vld1.8          {q10},    [r2], lr
+        paeth           d0,  d3,  d20, d4
+        vext.8          d5,  d22, d23, #3
+        vadd.u8         d0,  d0,  d22
+        vext.8          d17, d20, d21, #3
+        paeth           d1,  d0,  d17, d20
+        vst1.32         {d0[0]},  [r1,:32], r4
+        vext.8          d6,  d22, d23, #6
+        vadd.u8         d1,  d1,  d5
+        vext.8          d18, d20, d21, #6
+        paeth           d2,  d1,  d18, d17
+        vext.8          d7,  d23, d23, #1
+        vld1.8          {q11},    [r0], lr
+        vst1.32         {d1[0]},  [r1], r4
+        vadd.u8         d2,  d2,  d6
+        vext.8          d19, d21, d21, #1
+        paeth           d3,  d2,  d19, d18
+        vst1.32         {d2[0]},  [r1], r4
+        vmov            d4,  d19
+        vadd.u8         d3,  d3,  d7
+        vst1.32         {d3[0]},  [r1], r4
+        subs            r12, r12, #12
+        bgt             1b
+
+        pop             {r4,pc}
+endfunc
--- a/config.guess
+++ b/config.guess
@@ -1,10 +1,10 @@
 #! /bin/sh
 # Attempt to guess a canonical system name.
 #   Copyright (C) 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999,
-#   2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009
-#   Free Software Foundation, Inc.
+#   2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010,
+#   2011 Free Software Foundation, Inc.

-timestamp='2009-11-20'
+timestamp='2011-02-02'

 # This file is free software; you can redistribute it and/or modify it
 # under the terms of the GNU General Public License as published by
@@ -56,8 +56,9 @@ version="\
 GNU config.guess ($timestamp)

 Originally written by Per Bothner.
-Copyright (C) 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999, 2000, 2001,
-2002, 2003, 2004, 2005, 2006, 2007, 2008 Free Software Foundation, Inc.
+Copyright (C) 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999, 2000,
+2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011 Free
+Software Foundation, Inc.

 This is free software; see the source for copying conditions.  There is NO
 warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE."
@@ -139,6 +140,29 @@ UNAME_RELEASE=`(uname -r) 2>/dev/null` || UNAME_RELEASE=unknown
 UNAME_SYSTEM=`(uname -s) 2>/dev/null`  || UNAME_SYSTEM=unknown
 UNAME_VERSION=`(uname -v) 2>/dev/null` || UNAME_VERSION=unknown

+case "${UNAME_SYSTEM}" in
+Linux|GNU/*)
+	eval $set_cc_for_build
+	cat <<-EOF > $dummy.c
+	#include <features.h>
+	#ifdef __UCLIBC__
+	# ifdef __UCLIBC_CONFIG_VERSION__
+	LIBC=uclibc __UCLIBC_CONFIG_VERSION__
+	# else
+	LIBC=uclibc
+	# endif
+	#else
+	# ifdef __dietlibc__
+	LIBC=dietlibc
+	# else
+	LIBC=gnu
+	# endif
+	#endif
+	EOF
+	eval `$CC_FOR_BUILD -E $dummy.c 2>/dev/null | grep '^LIBC'`
+	;;
+esac
+
 # Note: order is significant - the case branches are not exclusive.

 case "${UNAME_MACHINE}:${UNAME_SYSTEM}:${UNAME_RELEASE}:${UNAME_VERSION}" in
@@ -180,7 +204,7 @@ case "${UNAME_MACHINE}:${UNAME_SYSTEM}:${UNAME_RELEASE}:${UNAME_VERSION}" in
 		fi
 		;;
 	    *)
-	        os=netbsd
+		os=netbsd
 		;;
 	esac
 	# The OS release
@@ -223,7 +247,7 @@ case "${UNAME_MACHINE}:${UNAME_SYSTEM}:${UNAME_RELEASE}:${UNAME_VERSION}" in
 		UNAME_RELEASE=`/usr/sbin/sizer -v | awk '{print $3}'`
 		;;
 	*5.*)
-	        UNAME_RELEASE=`/usr/sbin/sizer -v | awk '{print $4}'`
+		UNAME_RELEASE=`/usr/sbin/sizer -v | awk '{print $4}'`
 		;;
 	esac
 	# According to Compaq, /usr/sbin/psrinfo has been available on
@@ -269,7 +293,10 @@ case "${UNAME_MACHINE}:${UNAME_SYSTEM}:${UNAME_RELEASE}:${UNAME_VERSION}" in
 	# A Xn.n version is an unreleased experimental baselevel.
 	# 1.2 uses "1.2" for uname -r.
 	echo ${UNAME_MACHINE}-dec-osf`echo ${UNAME_RELEASE} | sed -e 's/^[PVTX]//' | tr 'ABCDEFGHIJKLMNOPQRSTUVWXYZ' 'abcdefghijklmnopqrstuvwxyz'`
-	exit ;;
+	# Reset EXIT trap before exiting to avoid spurious non-zero exit code.
+	exitcode=$?
+	trap '' 0
+	exit $exitcode ;;
    Alpha\ *:Windows_NT*:*)
 	# How do we know it's Interix rather than the generic POSIX subsystem?
 	# Should we change UNAME_MACHINE based on the output of uname instead
@@ -295,7 +322,7 @@ case "${UNAME_MACHINE}:${UNAME_SYSTEM}:${UNAME_RELEASE}:${UNAME_VERSION}" in
 	echo s390-ibm-zvmoe
 	exit ;;
    *:OS400:*:*)
-        echo powerpc-ibm-os400
+	echo powerpc-ibm-os400
 	exit ;;
    arm:RISC*:1.[012]*:*|arm:riscix:1.[012]*:*)
 	echo arm-acorn-riscix${UNAME_RELEASE}
@@ -394,23 +421,23 @@ case "${UNAME_MACHINE}:${UNAME_SYSTEM}:${UNAME_RELEASE}:${UNAME_VERSION}" in
    # MiNT.  But MiNT is downward compatible to TOS, so this should
    # be no problem.
    atarist[e]:*MiNT:*:* | atarist[e]:*mint:*:* | atarist[e]:*TOS:*:*)
-        echo m68k-atari-mint${UNAME_RELEASE}
+	echo m68k-atari-mint${UNAME_RELEASE}
 	exit ;;
    atari*:*MiNT:*:* | atari*:*mint:*:* | atarist[e]:*TOS:*:*)
 	echo m68k-atari-mint${UNAME_RELEASE}
-        exit ;;
+	exit ;;
    *falcon*:*MiNT:*:* | *falcon*:*mint:*:* | *falcon*:*TOS:*:*)
-        echo m68k-atari-mint${UNAME_RELEASE}
+	echo m68k-atari-mint${UNAME_RELEASE}
 	exit ;;
    milan*:*MiNT:*:* | milan*:*mint:*:* | *milan*:*TOS:*:*)
-        echo m68k-milan-mint${UNAME_RELEASE}
-        exit ;;
+	echo m68k-milan-mint${UNAME_RELEASE}
+	exit ;;
    hades*:*MiNT:*:* | hades*:*mint:*:* | *hades*:*TOS:*:*)
-        echo m68k-hades-mint${UNAME_RELEASE}
-        exit ;;
+	echo m68k-hades-mint${UNAME_RELEASE}
+	exit ;;
    *:*MiNT:*:* | *:*mint:*:* | *:*TOS:*:*)
-        echo m68k-unknown-mint${UNAME_RELEASE}
-        exit ;;
+	echo m68k-unknown-mint${UNAME_RELEASE}
+	exit ;;
    m68k:machten:*:*)
 	echo m68k-apple-machten${UNAME_RELEASE}
 	exit ;;
@@ -480,8 +507,8 @@ EOF
 	echo m88k-motorola-sysv3
 	exit ;;
    AViiON:dgux:*:*)
-        # DG/UX returns AViiON for all architectures
-        UNAME_PROCESSOR=`/usr/bin/uname -p`
+	# DG/UX returns AViiON for all architectures
+	UNAME_PROCESSOR=`/usr/bin/uname -p`
 	if [ $UNAME_PROCESSOR = mc88100 ] || [ $UNAME_PROCESSOR = mc88110 ]
 	then
 	    if [ ${TARGET_BINARY_INTERFACE}x = m88kdguxelfx ] || \
@@ -494,7 +521,7 @@ EOF
 	else
 	    echo i586-dg-dgux${UNAME_RELEASE}
 	fi
- 	exit ;;
+	exit ;;
    M88*:DolphinOS:*:*)	# DolphinOS (SVR3)
 	echo m88k-dolphin-sysv3
 	exit ;;
@@ -551,7 +578,7 @@ EOF
 		echo rs6000-ibm-aix3.2
 	fi
 	exit ;;
-    *:AIX:*:[456])
+    *:AIX:*:[4567])
 	IBM_CPU_ID=`/usr/sbin/lsdev -C -c processor -S available | sed 1q | awk '{ print $1 }'`
 	if /usr/sbin/lsattr -El ${IBM_CPU_ID} | grep ' POWER' >/dev/null 2>&1; then
 		IBM_ARCH=rs6000
@@ -594,52 +621,52 @@ EOF
 	    9000/[678][0-9][0-9])
 		if [ -x /usr/bin/getconf ]; then
 		    sc_cpu_version=`/usr/bin/getconf SC_CPU_VERSION 2>/dev/null`
-                    sc_kernel_bits=`/usr/bin/getconf SC_KERNEL_BITS 2>/dev/null`
-                    case "${sc_cpu_version}" in
-                      523) HP_ARCH="hppa1.0" ;; # CPU_PA_RISC1_0
-                      528) HP_ARCH="hppa1.1" ;; # CPU_PA_RISC1_1
-                      532)                      # CPU_PA_RISC2_0
-                        case "${sc_kernel_bits}" in
-                          32) HP_ARCH="hppa2.0n" ;;
-                          64) HP_ARCH="hppa2.0w" ;;
+		    sc_kernel_bits=`/usr/bin/getconf SC_KERNEL_BITS 2>/dev/null`
+		    case "${sc_cpu_version}" in
+		      523) HP_ARCH="hppa1.0" ;; # CPU_PA_RISC1_0
+		      528) HP_ARCH="hppa1.1" ;; # CPU_PA_RISC1_1
+		      532)                      # CPU_PA_RISC2_0
+			case "${sc_kernel_bits}" in
+			  32) HP_ARCH="hppa2.0n" ;;
+			  64) HP_ARCH="hppa2.0w" ;;
 			  '') HP_ARCH="hppa2.0" ;;   # HP-UX 10.20
-                        esac ;;
-                    esac
+			esac ;;
+		    esac
 		fi
 		if [ "${HP_ARCH}" = "" ]; then
 		    eval $set_cc_for_build
-		    sed 's/^              //' << EOF >$dummy.c
+		    sed 's/^		//' << EOF >$dummy.c

-              #define _HPUX_SOURCE
-              #include <stdlib.h>
-              #include <unistd.h>
+		#define _HPUX_SOURCE
+		#include <stdlib.h>
+		#include <unistd.h>

-              int main ()
-              {
-              #if defined(_SC_KERNEL_BITS)
-                  long bits = sysconf(_SC_KERNEL_BITS);
-              #endif
-                  long cpu  = sysconf (_SC_CPU_VERSION);
+		int main ()
+		{
+		#if defined(_SC_KERNEL_BITS)
+		    long bits = sysconf(_SC_KERNEL_BITS);
+		#endif
+		    long cpu  = sysconf (_SC_CPU_VERSION);

-                  switch (cpu)
-              	{
-              	case CPU_PA_RISC1_0: puts ("hppa1.0"); break;
-              	case CPU_PA_RISC1_1: puts ("hppa1.1"); break;
-              	case CPU_PA_RISC2_0:
-              #if defined(_SC_KERNEL_BITS)
-              	    switch (bits)
-              		{
-              		case 64: puts ("hppa2.0w"); break;
-              		case 32: puts ("hppa2.0n"); break;
-              		default: puts ("hppa2.0"); break;
-              		} break;
-              #else  /* !defined(_SC_KERNEL_BITS) */
-              	    puts ("hppa2.0"); break;
-              #endif
-              	default: puts ("hppa1.0"); break;
-              	}
-                  exit (0);
-              }
+		    switch (cpu)
+			{
+			case CPU_PA_RISC1_0: puts ("hppa1.0"); break;
+			case CPU_PA_RISC1_1: puts ("hppa1.1"); break;
+			case CPU_PA_RISC2_0:
+		#if defined(_SC_KERNEL_BITS)
+			    switch (bits)
+				{
+				case 64: puts ("hppa2.0w"); break;
+				case 32: puts ("hppa2.0n"); break;
+				default: puts ("hppa2.0"); break;
+				} break;
+		#else  /* !defined(_SC_KERNEL_BITS) */
+			    puts ("hppa2.0"); break;
+		#endif
+			default: puts ("hppa1.0"); break;
+			}
+		    exit (0);
+		}
 EOF
 		    (CCOPTS= $CC_FOR_BUILD -o $dummy $dummy.c 2>/dev/null) && HP_ARCH=`$dummy`
 		    test -z "$HP_ARCH" && HP_ARCH=hppa
@@ -730,22 +757,22 @@ EOF
 	exit ;;
    C1*:ConvexOS:*:* | convex:ConvexOS:C1*:*)
 	echo c1-convex-bsd
-        exit ;;
+	exit ;;
    C2*:ConvexOS:*:* | convex:ConvexOS:C2*:*)
 	if getsysinfo -f scalar_acc
 	then echo c32-convex-bsd
 	else echo c2-convex-bsd
 	fi
-        exit ;;
+	exit ;;
    C34*:ConvexOS:*:* | convex:ConvexOS:C34*:*)
 	echo c34-convex-bsd
-        exit ;;
+	exit ;;
    C38*:ConvexOS:*:* | convex:ConvexOS:C38*:*)
 	echo c38-convex-bsd
-        exit ;;
+	exit ;;
    C4*:ConvexOS:*:* | convex:ConvexOS:C4*:*)
 	echo c4-convex-bsd
-        exit ;;
+	exit ;;
    CRAY*Y-MP:*:*:*)
 	echo ymp-cray-unicos${UNAME_RELEASE} | sed -e 's/\.[^.]*$/.X/'
 	exit ;;
@@ -769,14 +796,14 @@ EOF
 	exit ;;
    F30[01]:UNIX_System_V:*:* | F700:UNIX_System_V:*:*)
 	FUJITSU_PROC=`uname -m | tr 'ABCDEFGHIJKLMNOPQRSTUVWXYZ' 'abcdefghijklmnopqrstuvwxyz'`
-        FUJITSU_SYS=`uname -p | tr 'ABCDEFGHIJKLMNOPQRSTUVWXYZ' 'abcdefghijklmnopqrstuvwxyz' | sed -e 's/\///'`
-        FUJITSU_REL=`echo ${UNAME_RELEASE} | sed -e 's/ /_/'`
-        echo "${FUJITSU_PROC}-fujitsu-${FUJITSU_SYS}${FUJITSU_REL}"
-        exit ;;
+	FUJITSU_SYS=`uname -p | tr 'ABCDEFGHIJKLMNOPQRSTUVWXYZ' 'abcdefghijklmnopqrstuvwxyz' | sed -e 's/\///'`
+	FUJITSU_REL=`echo ${UNAME_RELEASE} | sed -e 's/ /_/'`
+	echo "${FUJITSU_PROC}-fujitsu-${FUJITSU_SYS}${FUJITSU_REL}"
+	exit ;;
    5000:UNIX_System_V:4.*:*)
-        FUJITSU_SYS=`uname -p | tr 'ABCDEFGHIJKLMNOPQRSTUVWXYZ' 'abcdefghijklmnopqrstuvwxyz' | sed -e 's/\///'`
-        FUJITSU_REL=`echo ${UNAME_RELEASE} | tr 'ABCDEFGHIJKLMNOPQRSTUVWXYZ' 'abcdefghijklmnopqrstuvwxyz' | sed -e 's/ /_/'`
-        echo "sparc-fujitsu-${FUJITSU_SYS}${FUJITSU_REL}"
+	FUJITSU_SYS=`uname -p | tr 'ABCDEFGHIJKLMNOPQRSTUVWXYZ' 'abcdefghijklmnopqrstuvwxyz' | sed -e 's/\///'`
+	FUJITSU_REL=`echo ${UNAME_RELEASE} | tr 'ABCDEFGHIJKLMNOPQRSTUVWXYZ' 'abcdefghijklmnopqrstuvwxyz' | sed -e 's/ /_/'`
+	echo "sparc-fujitsu-${FUJITSU_SYS}${FUJITSU_REL}"
 	exit ;;
    i*86:BSD/386:*:* | i*86:BSD/OS:*:* | *:Ascend\ Embedded/OS:*:*)
 	echo ${UNAME_MACHINE}-pc-bsdi${UNAME_RELEASE}
@@ -804,14 +831,14 @@ EOF
 	echo ${UNAME_MACHINE}-pc-mingw32
 	exit ;;
    i*:windows32*:*)
-    	# uname -m includes "-pc" on this system.
-    	echo ${UNAME_MACHINE}-mingw32
+	# uname -m includes "-pc" on this system.
+	echo ${UNAME_MACHINE}-mingw32
 	exit ;;
    i*:PW*:*)
 	echo ${UNAME_MACHINE}-pc-pw32
 	exit ;;
    *:Interix*:*)
-    	case ${UNAME_MACHINE} in
+	case ${UNAME_MACHINE} in
 	    x86)
 		echo i586-pc-interix${UNAME_RELEASE}
 		exit ;;
@@ -848,11 +875,11 @@ EOF
 	exit ;;
    *:GNU:*:*)
 	# the GNU system
-	echo `echo ${UNAME_MACHINE}|sed -e 's,[-/].*$,,'`-unknown-gnu`echo ${UNAME_RELEASE}|sed -e 's,/.*$,,'`
+	echo `echo ${UNAME_MACHINE}|sed -e 's,[-/].*$,,'`-unknown-${LIBC}`echo ${UNAME_RELEASE}|sed -e 's,/.*$,,'`
 	exit ;;
    *:GNU/*:*:*)
 	# other systems with GNU libc and userland
-	echo ${UNAME_MACHINE}-unknown-`echo ${UNAME_SYSTEM} | sed 's,^[^/]*/,,' | tr '[A-Z]' '[a-z]'``echo ${UNAME_RELEASE}|sed -e 's/[-(].*//'`-gnu
+	echo ${UNAME_MACHINE}-unknown-`echo ${UNAME_SYSTEM} | sed 's,^[^/]*/,,' | tr '[A-Z]' '[a-z]'``echo ${UNAME_RELEASE}|sed -e 's/[-(].*//'`-${LIBC}
 	exit ;;
    i*86:Minix:*:*)
 	echo ${UNAME_MACHINE}-pc-minix
@@ -866,52 +893,44 @@ EOF
 	  EV6)   UNAME_MACHINE=alphaev6 ;;
 	  EV67)  UNAME_MACHINE=alphaev67 ;;
 	  EV68*) UNAME_MACHINE=alphaev68 ;;
-        esac
+	esac
 	objdump --private-headers /bin/sh | grep -q ld.so.1
-	if test "$?" = 0 ; then LIBC="libc1" ; else LIBC="" ; fi
-	echo ${UNAME_MACHINE}-unknown-linux-gnu${LIBC}
+	if test "$?" = 0 ; then LIBC="gnulibc1" ; fi
+	echo ${UNAME_MACHINE}-unknown-linux-${LIBC}
 	exit ;;
    arm*:Linux:*:*)
 	eval $set_cc_for_build
 	if echo __ARM_EABI__ | $CC_FOR_BUILD -E - 2>/dev/null \
 	    | grep -q __ARM_EABI__
 	then
-	    echo ${UNAME_MACHINE}-unknown-linux-gnu
+	    echo ${UNAME_MACHINE}-unknown-linux-${LIBC}
 	else
-	    echo ${UNAME_MACHINE}-unknown-linux-gnueabi
+	    echo ${UNAME_MACHINE}-unknown-linux-${LIBC}eabi
 	fi
 	exit ;;
    avr32*:Linux:*:*)
-	echo ${UNAME_MACHINE}-unknown-linux-gnu
+	echo ${UNAME_MACHINE}-unknown-linux-${LIBC}
 	exit ;;
    cris:Linux:*:*)
-	echo cris-axis-linux-gnu
+	echo cris-axis-linux-${LIBC}
 	exit ;;
    crisv32:Linux:*:*)
-	echo crisv32-axis-linux-gnu
+	echo crisv32-axis-linux-${LIBC}
 	exit ;;
    frv:Linux:*:*)
-    	echo frv-unknown-linux-gnu
+	echo frv-unknown-linux-${LIBC}
 	exit ;;
    i*86:Linux:*:*)
-	LIBC=gnu
-	eval $set_cc_for_build
-	sed 's/^	//' << EOF >$dummy.c
-	#ifdef __dietlibc__
-	LIBC=dietlibc
-	#endif
-EOF
-	eval `$CC_FOR_BUILD -E $dummy.c 2>/dev/null | grep '^LIBC'`
-	echo "${UNAME_MACHINE}-pc-linux-${LIBC}"
+	echo ${UNAME_MACHINE}-pc-linux-${LIBC}
 	exit ;;
    ia64:Linux:*:*)
-	echo ${UNAME_MACHINE}-unknown-linux-gnu
+	echo ${UNAME_MACHINE}-unknown-linux-${LIBC}
 	exit ;;
    m32r*:Linux:*:*)
-	echo ${UNAME_MACHINE}-unknown-linux-gnu
+	echo ${UNAME_MACHINE}-unknown-linux-${LIBC}
 	exit ;;
    m68*:Linux:*:*)
-	echo ${UNAME_MACHINE}-unknown-linux-gnu
+	echo ${UNAME_MACHINE}-unknown-linux-${LIBC}
 	exit ;;
    mips:Linux:*:* | mips64:Linux:*:*)
 	eval $set_cc_for_build
@@ -930,51 +949,54 @@ EOF
 	#endif
 EOF
 	eval `$CC_FOR_BUILD -E $dummy.c 2>/dev/null | grep '^CPU'`
-	test x"${CPU}" != x && { echo "${CPU}-unknown-linux-gnu"; exit; }
+	test x"${CPU}" != x && { echo "${CPU}-unknown-linux-${LIBC}"; exit; }
 	;;
    or32:Linux:*:*)
-	echo or32-unknown-linux-gnu
+	echo or32-unknown-linux-${LIBC}
 	exit ;;
    padre:Linux:*:*)
-	echo sparc-unknown-linux-gnu
+	echo sparc-unknown-linux-${LIBC}
 	exit ;;
    parisc64:Linux:*:* | hppa64:Linux:*:*)
-	echo hppa64-unknown-linux-gnu
+	echo hppa64-unknown-linux-${LIBC}
 	exit ;;
    parisc:Linux:*:* | hppa:Linux:*:*)
 	# Look for CPU level
 	case `grep '^cpu[^a-z]*:' /proc/cpuinfo 2>/dev/null | cut -d' ' -f2` in
-	  PA7*) echo hppa1.1-unknown-linux-gnu ;;
-	  PA8*) echo hppa2.0-unknown-linux-gnu ;;
-	  *)    echo hppa-unknown-linux-gnu ;;
+	  PA7*) echo hppa1.1-unknown-linux-${LIBC} ;;
+	  PA8*) echo hppa2.0-unknown-linux-${LIBC} ;;
+	  *)    echo hppa-unknown-linux-${LIBC} ;;
 	esac
 	exit ;;
    ppc64:Linux:*:*)
-	echo powerpc64-unknown-linux-gnu
+	echo powerpc64-unknown-linux-${LIBC}
 	exit ;;
    ppc:Linux:*:*)
-	echo powerpc-unknown-linux-gnu
+	echo powerpc-unknown-linux-${LIBC}
 	exit ;;
    s390:Linux:*:* | s390x:Linux:*:*)
 	echo ${UNAME_MACHINE}-ibm-linux
 	exit ;;
    sh64*:Linux:*:*)
-    	echo ${UNAME_MACHINE}-unknown-linux-gnu
+	echo ${UNAME_MACHINE}-unknown-linux-${LIBC}
 	exit ;;
    sh*:Linux:*:*)
-	echo ${UNAME_MACHINE}-unknown-linux-gnu
+	echo ${UNAME_MACHINE}-unknown-linux-${LIBC}
 	exit ;;
    sparc:Linux:*:* | sparc64:Linux:*:*)
-	echo ${UNAME_MACHINE}-unknown-linux-gnu
+	echo ${UNAME_MACHINE}-unknown-linux-${LIBC}
+	exit ;;
+    tile*:Linux:*:*)
+	echo ${UNAME_MACHINE}-tilera-linux-gnu
 	exit ;;
    vax:Linux:*:*)
-	echo ${UNAME_MACHINE}-dec-linux-gnu
+	echo ${UNAME_MACHINE}-dec-linux-${LIBC}
 	exit ;;
    x86_64:Linux:*:*)
-	echo x86_64-unknown-linux-gnu
+	echo x86_64-unknown-linux-${LIBC}
 	exit ;;
    xtensa*:Linux:*:*)
-    	echo ${UNAME_MACHINE}-unknown-linux-gnu
+	echo ${UNAME_MACHINE}-unknown-linux-${LIBC}
 	exit ;;
    i*86:DYNIX/ptx:4*:*)
 	# ptx 4.0 does uname -s correctly, with DYNIX/ptx in there.
@@ -983,11 +1005,11 @@ EOF
 	echo i386-sequent-sysv4
 	exit ;;
    i*86:UNIX_SV:4.2MP:2.*)
-        # Unixware is an offshoot of SVR4, but it has its own version
-        # number series starting with 2...
-        # I am not positive that other SVR4 systems won't match this,
+	# Unixware is an offshoot of SVR4, but it has its own version
+	# number series starting with 2...
+	# I am not positive that other SVR4 systems won't match this,
 	# I just have to hope.  -- rms.
-        # Use sysv4.2uw... so that sysv4* matches it.
+	# Use sysv4.2uw... so that sysv4* matches it.
 	echo ${UNAME_MACHINE}-pc-sysv4.2uw${UNAME_VERSION}
 	exit ;;
    i*86:OS/2:*:*)
@@ -1019,7 +1041,7 @@ EOF
 	fi
 	exit ;;
    i*86:*:5:[678]*)
-    	# UnixWare 7.x, OpenUNIX and OpenServer 6.
+	# UnixWare 7.x, OpenUNIX and OpenServer 6.
 	case `/bin/uname -X | grep "^Machine"` in
 	    *486*)	     UNAME_MACHINE=i486 ;;
 	    *Pentium)	     UNAME_MACHINE=i586 ;;
@@ -1047,13 +1069,13 @@ EOF
 	exit ;;
    pc:*:*:*)
 	# Left here for compatibility:
-        # uname -m prints for DJGPP always 'pc', but it prints nothing about
-        # the processor, so we play safe by assuming i586.
+	# uname -m prints for DJGPP always 'pc', but it prints nothing about
+	# the processor, so we play safe by assuming i586.
 	# Note: whatever this is, it MUST be the same as what config.sub
 	# prints for the "djgpp" host, or else GDB configury will decide that
 	# this is a cross-build.
 	echo i586-pc-msdosdjgpp
-        exit ;;
+	exit ;;
    Intel:Mach:3*:*)
 	echo i386-pc-mach3
 	exit ;;
@@ -1088,8 +1110,8 @@ EOF
 	/bin/uname -p 2>/dev/null | /bin/grep entium >/dev/null \
 	  && { echo i586-ncr-sysv4.3${OS_REL}; exit; } ;;
    3[34]??:*:4.0:* | 3[34]??,*:*:4.0:*)
-        /bin/uname -p 2>/dev/null | grep 86 >/dev/null \
-          && { echo i486-ncr-sysv4; exit; } ;;
+	/bin/uname -p 2>/dev/null | grep 86 >/dev/null \
+	  && { echo i486-ncr-sysv4; exit; } ;;
    NCR*:*:4.2:* | MPRAS*:*:4.2:*)
 	OS_REL='.3'
 	test -r /etc/.relid \
@@ -1132,10 +1154,10 @@ EOF
 		echo ns32k-sni-sysv
 	fi
 	exit ;;
-    PENTIUM:*:4.0*:*) # Unisys `ClearPath HMP IX 4000' SVR4/MP effort
-                      # says <Richard.M.Bartel@ccMail.Census.GOV>
-        echo i586-unisys-sysv4
-        exit ;;
+    PENTIUM:*:4.0*:*)	# Unisys `ClearPath HMP IX 4000' SVR4/MP effort
+			# says <Richard.M.Bartel@ccMail.Census.GOV>
+	echo i586-unisys-sysv4
+	exit ;;
    *:UNIX_System_V:4*:FTX*)
 	# From Gerald Hewes <hewes@openmarket.com>.
 	# How about differentiating between stratus architectures? -djm
@@ -1161,11 +1183,11 @@ EOF
 	exit ;;
    R[34]000:*System_V*:*:* | R4000:UNIX_SYSV:*:* | R*000:UNIX_SV:*:*)
 	if [ -d /usr/nec ]; then
-	        echo mips-nec-sysv${UNAME_RELEASE}
+		echo mips-nec-sysv${UNAME_RELEASE}
 	else
-	        echo mips-unknown-sysv${UNAME_RELEASE}
+		echo mips-unknown-sysv${UNAME_RELEASE}
 	fi
-        exit ;;
+	exit ;;
    BeBox:BeOS:*:*)	# BeOS running on hardware made by Be, PPC only.
 	echo powerpc-be-beos
 	exit ;;
@@ -1230,6 +1252,9 @@ EOF
    *:QNX:*:4*)
 	echo i386-pc-qnx
 	exit ;;
+    NEO-?:NONSTOP_KERNEL:*:*)
+	echo neo-tandem-nsk${UNAME_RELEASE}
+	exit ;;
    NSE-?:NONSTOP_KERNEL:*:*)
 	echo nse-tandem-nsk${UNAME_RELEASE}
 	exit ;;
@@ -1275,13 +1300,13 @@ EOF
 	echo pdp10-unknown-its
 	exit ;;
    SEI:*:*:SEIUX)
-        echo mips-sei-seiux${UNAME_RELEASE}
+	echo mips-sei-seiux${UNAME_RELEASE}
 	exit ;;
    *:DragonFly:*:*)
 	echo ${UNAME_MACHINE}-unknown-dragonfly`echo ${UNAME_RELEASE}|sed -e 's/[-(].*//'`
 	exit ;;
    *:*VMS:*:*)
-    	UNAME_MACHINE=`(uname -p) 2>/dev/null`
+	UNAME_MACHINE=`(uname -p) 2>/dev/null`
 	case "${UNAME_MACHINE}" in
 	    A*) echo alpha-dec-vms ; exit ;;
 	    I*) echo ia64-dec-vms ; exit ;;
@@ -1321,11 +1346,11 @@ main ()
 #include <sys/param.h>
  printf ("m68k-sony-newsos%s\n",
 #ifdef NEWSOS4
-          "4"
+	"4"
 #else
-	  ""
+	""
 #endif
-         ); exit (0);
+	); exit (0);
 #endif
 #endif

--- a/config.h.in
+++ b/config.h.in
@@ -70,6 +70,12 @@
 /* Define to the version of this package. */
 #undef PACKAGE_VERSION

+/* Align row buffers */
+#undef PNG_ALIGNED_MEMORY_SUPPORTED
+
+/* Enable ARM NEON optmizations */
+#undef PNG_ARM_NEON
+
 /* Define to 1 if you have the ANSI C header files. */
 #undef STDC_HEADERS

--- a/config.sub
+++ b/config.sub
@@ -1,10 +1,10 @@
 #! /bin/sh
 # Configuration validation subroutine script.
 #   Copyright (C) 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999,
-#   2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009
-#   Free Software Foundation, Inc.
+#   2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010,
+#   2011 Free Software Foundation, Inc.

-timestamp='2009-11-20'
+timestamp='2011-02-02'

 # This file is (in principle) common to ALL GNU software.
 # The presence of a machine in this file suggests that SOME GNU software
@@ -75,8 +75,9 @@ Report bugs and patches to <config-patches@gnu.org>."
 version="\
 GNU config.sub ($timestamp)

-Copyright (C) 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999, 2000, 2001,
-2002, 2003, 2004, 2005, 2006, 2007, 2008 Free Software Foundation, Inc.
+Copyright (C) 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999, 2000,
+2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010 Free
+Software Foundation, Inc.

 This is free software; see the source for copying conditions.  There is NO
 warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE."
@@ -123,8 +124,9 @@ esac
 # Here we must recognize all the valid KERNEL-OS combinations.
 maybe_os=`echo $1 | sed 's/^\(.*\)-\([^-]*-[^-]*\)$/\2/'`
 case $maybe_os in
-  nto-qnx* | linux-gnu* | linux-dietlibc | linux-newlib* | linux-uclibc* | \
-  uclinux-uclibc* | uclinux-gnu* | kfreebsd*-gnu* | knetbsd*-gnu* | netbsd*-gnu* | \
+  nto-qnx* | linux-gnu* | linux-android* | linux-dietlibc | linux-newlib* | \
+  linux-uclibc* | uclinux-uclibc* | uclinux-gnu* | kfreebsd*-gnu* | \
+  knetbsd*-gnu* | netbsd*-gnu* | \
  kopensolaris*-gnu* | \
  storm-chaos* | os2-emx* | rtmk-nova*)
    os=-$maybe_os
@@ -156,8 +158,8 @@ case $os in
 		os=
 		basic_machine=$1
 		;;
-        -bluegene*)
-	        os=-cnk
+	-bluegene*)
+		os=-cnk
 		;;
 	-sim | -cisco | -oki | -wec | -winbond)
 		os=
@@ -173,10 +175,10 @@ case $os in
 		os=-chorusos
 		basic_machine=$1
 		;;
- 	-chorusrdb)
- 		os=-chorusrdb
+	-chorusrdb)
+		os=-chorusrdb
 		basic_machine=$1
- 		;;
+		;;
 	-hiux*)
 		os=-hiuxwe2
 		;;
@@ -251,7 +253,7 @@ case $basic_machine in
 	| arc | arm | arm[bl]e | arme[lb] | armv[2345] | armv[345][lb] | avr | avr32 \
 	| bfin \
 	| c4x | clipper \
-	| d10v | d30v | dlx | dsp16xx \
+	| d10v | d30v | dlx | dsp16xx | dvp \
 	| fido | fr30 | frv \
 	| h8300 | h8500 | hppa | hppa1.[01] | hppa2.0 | hppa2.0[nw] | hppa64 \
 	| i370 | i860 | i960 | ia64 \
@@ -281,6 +283,7 @@ case $basic_machine in
 	| moxie \
 	| mt \
 	| msp430 \
+	| nds32 | nds32le | nds32be \
 	| nios | nios2 \
 	| ns16k | ns32k \
 	| or32 \
@@ -294,7 +297,7 @@ case $basic_machine in
 	| sparc | sparc64 | sparc64b | sparc64v | sparc86x | sparclet | sparclite \
 	| sparcv8 | sparcv9 | sparcv9b | sparcv9v \
 	| spu | strongarm \
-	| tahoe | thumb | tic4x | tic80 | tron \
+	| tahoe | thumb | tic4x | tic54x | tic55x | tic6x | tic80 | tron \
 	| ubicom32 \
 	| v850 | v850e \
 	| we32k \
@@ -302,6 +305,15 @@ case $basic_machine in
 	| z8k | z80)
 		basic_machine=$basic_machine-unknown
 		;;
+	c54x)
+		basic_machine=tic54x-unknown
+		;;
+	c55x)
+		basic_machine=tic55x-unknown
+		;;
+	c6x)
+		basic_machine=tic6x-unknown
+		;;
 	m6811 | m68hc11 | m6812 | m68hc12 | picochip)
 		# Motorola 68HC11/12.
 		basic_machine=$basic_machine-unknown
@@ -333,7 +345,7 @@ case $basic_machine in
 	| arm-*  | armbe-* | armle-* | armeb-* | armv*-* \
 	| avr-* | avr32-* \
 	| bfin-* | bs2000-* \
-	| c[123]* | c30-* | [cjt]90-* | c4x-* | c54x-* | c55x-* | c6x-* \
+	| c[123]* | c30-* | [cjt]90-* | c4x-* \
 	| clipper-* | craynv-* | cydra-* \
 	| d10v-* | d30v-* | dlx-* \
 	| elxsi-* \
@@ -367,6 +379,7 @@ case $basic_machine in
 	| mmix-* \
 	| mt-* \
 	| msp430-* \
+	| nds32-* | nds32le-* | nds32be-* \
 	| nios-* | nios2-* \
 	| none-* | np1-* | ns16k-* | ns32k-* \
 	| orion-* \
@@ -380,7 +393,8 @@ case $basic_machine in
 	| sparclite-* \
 	| sparcv8-* | sparcv9-* | sparcv9b-* | sparcv9v-* | strongarm-* | sv1-* | sx?-* \
 	| tahoe-* | thumb-* \
-	| tic30-* | tic4x-* | tic54x-* | tic55x-* | tic6x-* | tic80-* | tile-* \
+	| tic30-* | tic4x-* | tic54x-* | tic55x-* | tic6x-* | tic80-* \
+	| tile-* | tilegx-* \
 	| tron-* \
 	| ubicom32-* \
 	| v850-* | v850e-* | vax-* \
@@ -410,7 +424,7 @@ case $basic_machine in
 		basic_machine=a29k-amd
 		os=-udi
 		;;
-    	abacus)
+	abacus)
 		basic_machine=abacus-unknown
 		;;
 	adobe68k)
@@ -480,11 +494,20 @@ case $basic_machine in
 		basic_machine=powerpc-ibm
 		os=-cnk
 		;;
+	c54x-*)
+		basic_machine=tic54x-`echo $basic_machine | sed 's/^[^-]*-//'`
+		;;
+	c55x-*)
+		basic_machine=tic55x-`echo $basic_machine | sed 's/^[^-]*-//'`
+		;;
+	c6x-*)
+		basic_machine=tic6x-`echo $basic_machine | sed 's/^[^-]*-//'`
+		;;
 	c90)
 		basic_machine=c90-cray
 		os=-unicos
 		;;
-        cegcc)
+	cegcc)
 		basic_machine=arm-unknown
 		os=-cegcc
 		;;
@@ -516,7 +539,7 @@ case $basic_machine in
 		basic_machine=craynv-cray
 		os=-unicosmp
 		;;
-	cr16)
+	cr16 | cr16-*)
 		basic_machine=cr16-unknown
 		os=-elf
 		;;
@@ -732,7 +755,7 @@ case $basic_machine in
 		basic_machine=ns32k-utek
 		os=-sysv
 		;;
-        microblaze)
+	microblaze)
 		basic_machine=microblaze-xilinx
 		;;
 	mingw32)
@@ -750,6 +773,24 @@ case $basic_machine in
 		basic_machine=m68k-atari
 		os=-mint
 		;;
+	mipsEE* | ee | ps2)
+		basic_machine=mips64r5900el-scei
+		case $os in
+		    -linux*)
+			;;
+		    *)
+			os=-elf
+			;;
+		esac
+		;;
+	iop)
+		basic_machine=mipsel-scei
+		os=-irx
+		;;
+	dvp)
+		basic_machine=dvp-scei
+		os=-elf
+		;;
 	mips3*-*)
 		basic_machine=`echo $basic_machine | sed -e 's/mips3/mips64/'`
 		;;
@@ -839,6 +880,12 @@ case $basic_machine in
 	np1)
 		basic_machine=np1-gould
 		;;
+	neo-tandem)
+		basic_machine=neo-tandem
+		;;
+	nse-tandem)
+		basic_machine=nse-tandem
+		;;
 	nsr-tandem)
 		basic_machine=nsr-tandem
 		;;
@@ -1073,17 +1120,10 @@ case $basic_machine in
 		basic_machine=t90-cray
 		os=-unicos
 		;;
-	tic54x | c54x*)
-		basic_machine=tic54x-unknown
-		os=-coff
-		;;
-	tic55x | c55x*)
-		basic_machine=tic55x-unknown
-		os=-coff
-		;;
-	tic6x | c6x*)
-		basic_machine=tic6x-unknown
-		os=-coff
+	# This must be matched before tile*.
+	tilegx*)
+		basic_machine=tilegx-unknown
+		os=-linux-gnu
 		;;
 	tile*)
 		basic_machine=tile-unknown
@@ -1253,11 +1293,11 @@ esac
 if [ x"$os" != x"" ]
 then
 case $os in
-        # First match some system type aliases
-        # that might get confused with valid system types.
+	# First match some system type aliases
+	# that might get confused with valid system types.
 	# -solaris* is a basic system type, with this one exception.
-        -auroraux)
-	        os=-auroraux
+	-auroraux)
+		os=-auroraux
 		;;
 	-solaris1 | -solaris1.*)
 		os=`echo $os | sed -e 's|solaris1|sunos4|'`
@@ -1294,11 +1334,12 @@ case $os in
 	      | -udi* | -eabi* | -lites* | -ieee* | -go32* | -aux* \
 	      | -chorusos* | -chorusrdb* | -cegcc* \
 	      | -cygwin* | -pe* | -psos* | -moss* | -proelf* | -rtems* \
-	      | -mingw32* | -linux-gnu* | -linux-newlib* | -linux-uclibc* \
+	      | -mingw32* | -linux-gnu* | -linux-android* \
+	      | -linux-newlib* | -linux-uclibc* \
 	      | -uxpv* | -beos* | -mpeix* | -udk* \
 	      | -interix* | -uwin* | -mks* | -rhapsody* | -darwin* | -opened* \
 	      | -openstep* | -oskit* | -conix* | -pw32* | -nonstopux* \
-	      | -storm-chaos* | -tops10* | -tenex* | -tops20* | -its* \
+	      | -storm-chaos* | -tops10* | -tenex* | -tops20* | -its* | -irx* \
 	      | -os2* | -vos* | -palmos* | -uclinux* | -nucleus* \
 	      | -morphos* | -superux* | -rtmk* | -rtmk-nova* | -windiss* \
 	      | -powermax* | -dnix* | -nx6 | -nx7 | -sei* | -dragonfly* \
@@ -1341,7 +1382,7 @@ case $os in
 	-opened*)
 		os=-openedition
 		;;
-        -os400*)
+	-os400*)
 		os=-os400
 		;;
 	-wince*)
@@ -1390,7 +1431,7 @@ case $os in
 	-sinix*)
 		os=-sysv4
 		;;
-        -tpf*)
+	-tpf*)
 		os=-tpf
 		;;
 	-triton*)
@@ -1435,6 +1476,8 @@ case $os in
 	-dicos*)
 		os=-dicos
 		;;
+	-nacl*)
+		;;
 	-none)
 		;;
 	*)
@@ -1457,10 +1500,10 @@ else
 # system, and we'll never get to this point.

 case $basic_machine in
-        score-*)
+	score-*)
 		os=-elf
 		;;
-        spu-*)
+	spu-*)
 		os=-elf
 		;;
 	*-acorn)
@@ -1472,8 +1515,17 @@ case $basic_machine in
 	arm*-semi)
 		os=-aout
 		;;
-        c4x-* | tic4x-*)
-        	os=-coff
+	c4x-* | tic4x-*)
+		os=-coff
+		;;
+	tic54x-*)
+		os=-coff
+		;;
+	tic55x-*)
+		os=-coff
+		;;
+	tic6x-*)
+		os=-coff
 		;;
 	# This must come before the *-dec entry.
 	pdp10-*)
@@ -1500,7 +1552,7 @@ case $basic_machine in
 	m68*-cisco)
 		os=-aout
 		;;
-        mep-*)
+	mep-*)
 		os=-elf
 		;;
 	mips*-cisco)
@@ -1527,7 +1579,7 @@ case $basic_machine in
 	*-ibm)
 		os=-aix
 		;;
-    	*-knuth)
+	*-knuth)
 		os=-mmixware
 		;;
 	*-wec)
--- a/213
+++ b/213
@@ -1,6 +1,6 @@
 #! /bin/sh
 # Guess values for system-dependent variables and create Makefiles.
-# Generated by GNU Autoconf 2.68 for libpng 1.5.6beta05.
+# Generated by GNU Autoconf 2.68 for libpng 1.5.7beta01.
 #
 # Report bugs to <png-mng-implement@lists.sourceforge.net>.
 #
@@ -570,8 +570,8 @@ MAKEFLAGS=
 # Identity of this package.
 PACKAGE_NAME='libpng'
 PACKAGE_TARNAME='libpng'
-PACKAGE_VERSION='1.5.6beta05'
-PACKAGE_STRING='libpng 1.5.6beta05'
+PACKAGE_VERSION='1.5.7beta01'
+PACKAGE_STRING='libpng 1.5.7beta01'
 PACKAGE_BUGREPORT='png-mng-implement@lists.sourceforge.net'
 PACKAGE_URL=''

@@ -615,6 +615,8 @@ ac_includes_default="\
 ac_subst_vars='am__EXEEXT_FALSE
 am__EXEEXT_TRUE
 LTLIBOBJS
+PNG_ARM_NEON_FALSE
+PNG_ARM_NEON_TRUE
 binconfigs
 pkgconfigdir
 PNGLIB_RELEASE
@@ -661,6 +663,11 @@ build_os
 build_vendor
 build_cpu
 build
+am__fastdepCCAS_FALSE
+am__fastdepCCAS_TRUE
+CCASDEPMODE
+CCASFLAGS
+CCAS
 am__fastdepCC_FALSE
 am__fastdepCC_TRUE
 CCDEPMODE
@@ -756,6 +763,7 @@ enable_libtool_lock
 with_zlib_prefix
 with_pkgconfigdir
 with_binconfigs
+enable_arm_neon
 '
      ac_precious_vars='build_alias
 host_alias
@@ -765,6 +773,8 @@ CFLAGS
 LDFLAGS
 LIBS
 CPPFLAGS
+CCAS
+CCASFLAGS
 CPP'


@@ -1308,7 +1318,7 @@ if test "$ac_init_help" = "long"; then
  # Omit some internal or obsolete options to make the list less imposing.
  # This message is too long to be a string in the A/UX 3.1 sh.
  cat <<_ACEOF
-\`configure' configures libpng 1.5.6beta05 to adapt to many kinds of systems.
+\`configure' configures libpng 1.5.7beta01 to adapt to many kinds of systems.

 Usage: $0 [OPTION]... [VAR=VALUE]...

@@ -1378,7 +1388,7 @@ fi

 if test -n "$ac_init_help"; then
  case $ac_init_help in
-     short | recursive ) echo "Configuration of libpng 1.5.6beta05:";;
+     short | recursive ) echo "Configuration of libpng 1.5.7beta01:";;
   esac
  cat <<\_ACEOF

@@ -1395,6 +1405,7 @@ Optional Features:
  --enable-fast-install[=PKGS]
                          optimize for fast installation [default=yes]
  --disable-libtool-lock  avoid locking (might break parallel builds)
+  --enable-arm-neon       Enable ARM NEON optmizations

 Optional Packages:
  --with-PACKAGE[=ARG]    use PACKAGE [ARG=yes]
@@ -1418,6 +1429,8 @@ Some influential environment variables:
  LIBS        libraries to pass to the linker, e.g. -l<library>
  CPPFLAGS    (Objective) C/C++ preprocessor flags, e.g. -I<include dir> if
              you have headers in a nonstandard directory <include dir>
+  CCAS        assembler compiler command (defaults to CC)
+  CCASFLAGS   assembler compiler flags (defaults to CFLAGS)
  CPP         C preprocessor

 Use these variables to override the choices made by `configure' or to help
@@ -1486,7 +1499,7 @@ fi
 test -n "$ac_init_help" && exit $ac_status
 if $ac_init_version; then
  cat <<\_ACEOF
-libpng configure 1.5.6beta05
+libpng configure 1.5.7beta01
 generated by GNU Autoconf 2.68

 Copyright (C) 2010 Free Software Foundation, Inc.
@@ -1909,7 +1922,7 @@ cat >config.log <<_ACEOF
 This file contains any messages produced by compilers while
 running configure, to aid debugging if configure makes a mistake.

-It was created by libpng $as_me 1.5.6beta05, which was
+It was created by libpng $as_me 1.5.7beta01, which was
 generated by GNU Autoconf 2.68.  Invocation command line was

  $ $0 $@
@@ -2724,7 +2737,7 @@ fi

 # Define the identity of the package.
 PACKAGE='libpng'
- VERSION='1.5.6beta05'
+ VERSION='1.5.7beta01'


 cat >>confdefs.h <<_ACEOF
@@ -2788,10 +2801,10 @@ fi



-PNGLIB_VERSION=1.5.6beta05
+PNGLIB_VERSION=1.5.7beta01
 PNGLIB_MAJOR=1
 PNGLIB_MINOR=5
-PNGLIB_RELEASE=6
+PNGLIB_RELEASE=7



@@ -3784,6 +3797,138 @@ else
 fi


+# By default we simply use the C compiler to build assembly code.
+
+test "${CCAS+set}" = set || CCAS=$CC
+test "${CCASFLAGS+set}" = set || CCASFLAGS=$CFLAGS
+
+
+
+depcc="$CCAS"   am_compiler_list=
+
+{ $as_echo "$as_me:${as_lineno-$LINENO}: checking dependency style of $depcc" >&5
+$as_echo_n "checking dependency style of $depcc... " >&6; }
+if ${am_cv_CCAS_dependencies_compiler_type+:} false; then :
+  $as_echo_n "(cached) " >&6
+else
+  if test -z "$AMDEP_TRUE" && test -f "$am_depcomp"; then
+  # We make a subdir and do the tests there.  Otherwise we can end up
+  # making bogus files that we don't know about and never remove.  For
+  # instance it was reported that on HP-UX the gcc test will end up
+  # making a dummy file named `D' -- because `-MD' means `put the output
+  # in D'.
+  mkdir conftest.dir
+  # Copy depcomp to subdir because otherwise we won't find it if we're
+  # using a relative directory.
+  cp "$am_depcomp" conftest.dir
+  cd conftest.dir
+  # We will build objects and dependencies in a subdirectory because
+  # it helps to detect inapplicable dependency modes.  For instance
+  # both Tru64's cc and ICC support -MD to output dependencies as a
+  # side effect of compilation, but ICC will put the dependencies in
+  # the current directory while Tru64 will put them in the object
+  # directory.
+  mkdir sub
+
+  am_cv_CCAS_dependencies_compiler_type=none
+  if test "$am_compiler_list" = ""; then
+     am_compiler_list=`sed -n 's/^#*\([a-zA-Z0-9]*\))$/\1/p' < ./depcomp`
+  fi
+  am__universal=false
+
+
+  for depmode in $am_compiler_list; do
+    # Setup a source with many dependencies, because some compilers
+    # like to wrap large dependency lists on column 80 (with \), and
+    # we should not choose a depcomp mode which is confused by this.
+    #
+    # We need to recreate these files for each test, as the compiler may
+    # overwrite some of them when testing with obscure command lines.
+    # This happens at least with the AIX C compiler.
+    : > sub/conftest.c
+    for i in 1 2 3 4 5 6; do
+      echo '#include "conftst'$i'.h"' >> sub/conftest.c
+      # Using `: > sub/conftst$i.h' creates only sub/conftst1.h with
+      # Solaris 8's {/usr,}/bin/sh.
+      touch sub/conftst$i.h
+    done
+    echo "${am__include} ${am__quote}sub/conftest.Po${am__quote}" > confmf
+
+    # We check with `-c' and `-o' for the sake of the "dashmstdout"
+    # mode.  It turns out that the SunPro C++ compiler does not properly
+    # handle `-M -o', and we need to detect this.  Also, some Intel
+    # versions had trouble with output in subdirs
+    am__obj=sub/conftest.${OBJEXT-o}
+    am__minus_obj="-o $am__obj"
+    case $depmode in
+    gcc)
+      # This depmode causes a compiler race in universal mode.
+      test "$am__universal" = false || continue
+      ;;
+    nosideeffect)
+      # after this tag, mechanisms are not by side-effect, so they'll
+      # only be used when explicitly requested
+      if test "x$enable_dependency_tracking" = xyes; then
+	continue
+      else
+	break
+      fi
+      ;;
+    msvisualcpp | msvcmsys)
+      # This compiler won't grok `-c -o', but also, the minuso test has
+      # not run yet.  These depmodes are late enough in the game, and
+      # so weak that their functioning should not be impacted.
+      am__obj=conftest.${OBJEXT-o}
+      am__minus_obj=
+      ;;
+    none) break ;;
+    esac
+    if depmode=$depmode \
+       source=sub/conftest.c object=$am__obj \
+       depfile=sub/conftest.Po tmpdepfile=sub/conftest.TPo \
+       $SHELL ./depcomp $depcc -c $am__minus_obj sub/conftest.c \
+         >/dev/null 2>conftest.err &&
+       grep sub/conftst1.h sub/conftest.Po > /dev/null 2>&1 &&
+       grep sub/conftst6.h sub/conftest.Po > /dev/null 2>&1 &&
+       grep $am__obj sub/conftest.Po > /dev/null 2>&1 &&
+       ${MAKE-make} -s -f confmf > /dev/null 2>&1; then
+      # icc doesn't choke on unknown options, it will just issue warnings
+      # or remarks (even with -Werror).  So we grep stderr for any message
+      # that says an option was ignored or not supported.
+      # When given -MP, icc 7.0 and 7.1 complain thusly:
+      #   icc: Command line warning: ignoring option '-M'; no argument required
+      # The diagnosis changed in icc 8.0:
+      #   icc: Command line remark: option '-MP' not supported
+      if (grep 'ignoring option' conftest.err ||
+          grep 'not supported' conftest.err) >/dev/null 2>&1; then :; else
+        am_cv_CCAS_dependencies_compiler_type=$depmode
+        break
+      fi
+    fi
+  done
+
+  cd ..
+  rm -rf conftest.dir
+else
+  am_cv_CCAS_dependencies_compiler_type=none
+fi
+
+fi
+{ $as_echo "$as_me:${as_lineno-$LINENO}: result: $am_cv_CCAS_dependencies_compiler_type" >&5
+$as_echo "$am_cv_CCAS_dependencies_compiler_type" >&6; }
+CCASDEPMODE=depmode=$am_cv_CCAS_dependencies_compiler_type
+
+ if
+  test "x$enable_dependency_tracking" != xno \
+  && test "$am_cv_CCAS_dependencies_compiler_type" = gcc3; then
+  am__fastdepCCAS_TRUE=
+  am__fastdepCCAS_FALSE='#'
+else
+  am__fastdepCCAS_TRUE='#'
+  am__fastdepCCAS_FALSE=
+fi
+
+
 # Make sure we can run config.sub.
 $SHELL "$ac_aux_dir/config.sub" sun4 >/dev/null 2>&1 ||
  as_fn_error $? "cannot run $SHELL $ac_aux_dir/config.sub" "$LINENO" 5
@@ -10625,7 +10770,14 @@ freebsd* | dragonfly*)
    *) objformat=elf ;;
    esac
  fi
-  version_type=freebsd-$objformat
+  # Handle Gentoo/FreeBSD as it was Linux
+  case $host_vendor in
+    gentoo)
+      version_type=linux ;;
+    *)
+      version_type=freebsd-$objformat ;;
+  esac
+
  case $version_type in
    freebsd-elf*)
      library_names_spec='${libname}${release}${shared_ext}$versuffix ${libname}${release}${shared_ext} $libname${shared_ext}'
@@ -10636,6 +10788,12 @@ freebsd* | dragonfly*)
      library_names_spec='${libname}${release}${shared_ext}$versuffix $libname${shared_ext}$versuffix'
      need_version=yes
      ;;
+    linux)
+      library_names_spec='${libname}${release}${shared_ext}$versuffix ${libname}${release}${shared_ext}$major ${libname}${shared_ext}'
+      soname_spec='${libname}${release}${shared_ext}$major'
+      need_lib_prefix=no
+      need_version=no
+      ;;
  esac
  shlibpath_var=LD_LIBRARY_PATH
  case $host_os in
@@ -12521,6 +12679,27 @@ fi



+# Check whether --enable-arm-neon was given.
+if test "${enable_arm_neon+set}" = set; then :
+  enableval=$enable_arm_neon; if test "${enableval}" = yes; then
+
+$as_echo "#define PNG_ARM_NEON 1" >>confdefs.h
+
+
+$as_echo "#define PNG_ALIGNED_MEMORY_SUPPORTED 1" >>confdefs.h
+
+	fi
+fi
+
+ if test "${enable_arm_neon:-no}" = yes; then
+  PNG_ARM_NEON_TRUE=
+  PNG_ARM_NEON_FALSE='#'
+else
+  PNG_ARM_NEON_TRUE='#'
+  PNG_ARM_NEON_FALSE=
+fi
+
+
 # Config files, substituting as above
 ac_config_files="$ac_config_files Makefile libpng.pc:libpng.pc.in"

@@ -12656,6 +12835,10 @@ if test -z "${am__fastdepCC_TRUE}" && test -z "${am__fastdepCC_FALSE}"; then
  as_fn_error $? "conditional \"am__fastdepCC\" was never defined.
 Usually this means the macro was only invoked conditionally." "$LINENO" 5
 fi
+if test -z "${am__fastdepCCAS_TRUE}" && test -z "${am__fastdepCCAS_FALSE}"; then
+  as_fn_error $? "conditional \"am__fastdepCCAS\" was never defined.
+Usually this means the macro was only invoked conditionally." "$LINENO" 5
+fi
 if test -z "${HAVE_SOLARIS_LD_TRUE}" && test -z "${HAVE_SOLARIS_LD_FALSE}"; then
  as_fn_error $? "conditional \"HAVE_SOLARIS_LD\" was never defined.
 Usually this means the macro was only invoked conditionally." "$LINENO" 5
@@ -12664,6 +12847,10 @@ if test -z "${HAVE_LD_VERSION_SCRIPT_TRUE}" && test -z "${HAVE_LD_VERSION_SCRIPT
  as_fn_error $? "conditional \"HAVE_LD_VERSION_SCRIPT\" was never defined.
 Usually this means the macro was only invoked conditionally." "$LINENO" 5
 fi
+if test -z "${PNG_ARM_NEON_TRUE}" && test -z "${PNG_ARM_NEON_FALSE}"; then
+  as_fn_error $? "conditional \"PNG_ARM_NEON\" was never defined.
+Usually this means the macro was only invoked conditionally." "$LINENO" 5
+fi

 : "${CONFIG_STATUS=./config.status}"
 ac_write_fail=0
@@ -13073,7 +13260,7 @@ cat >>$CONFIG_STATUS <<\_ACEOF || ac_write_fail=1
 # report actual input values of CONFIG_FILES etc. instead of their
 # values after options handling.
 ac_log="
-This file was extended by libpng $as_me 1.5.6beta05, which was
+This file was extended by libpng $as_me 1.5.7beta01, which was
 generated by GNU Autoconf 2.68.  Invocation command line was

  CONFIG_FILES    = $CONFIG_FILES
@@ -13139,7 +13326,7 @@ _ACEOF
 cat >>$CONFIG_STATUS <<_ACEOF || ac_write_fail=1
 ac_cs_config="`$as_echo "$ac_configure_args" | sed 's/^ //; s/[\\""\`\$]/\\\\&/g'`"
 ac_cs_version="\\
-libpng config.status 1.5.6beta05
+libpng config.status 1.5.7beta01
 configured by $0, generated by GNU Autoconf 2.68,
  with options \\"\$ac_cs_config\\"

--- a/configure.ac
+++ b/configure.ac
@@ -18,15 +18,15 @@ AC_PREREQ(2.59)

 dnl Version number stuff here:

-AC_INIT([libpng], [1.5.6beta05], [png-mng-implement@lists.sourceforge.net])
+AC_INIT([libpng], [1.5.7beta01], [png-mng-implement@lists.sourceforge.net])
 AM_INIT_AUTOMAKE
 dnl stop configure from automagically running automake
 AM_MAINTAINER_MODE

-PNGLIB_VERSION=1.5.6beta05
+PNGLIB_VERSION=1.5.7beta01
 PNGLIB_MAJOR=1
 PNGLIB_MINOR=5
-PNGLIB_RELEASE=6
+PNGLIB_RELEASE=7

 dnl End of version number stuff

@@ -36,6 +36,7 @@ AM_CONFIG_HEADER(config.h)
 # Checks for programs.
 AC_LANG([C])
 AC_PROG_CC
+AM_PROG_AS
 AC_PROG_LD
 AC_PROG_CPP
 AC_CHECK_TOOL(SED, sed, :)
@@ -177,6 +178,14 @@ AC_ARG_WITH(binconfigs,
 	[binconfigs='${binconfigs}'])
 AC_SUBST([binconfigs])

+AC_ARG_ENABLE([arm-neon],
+	AC_HELP_STRING([--enable-arm-neon], [Enable ARM NEON optmizations]),
+	[if test "${enableval}" = yes; then
+		AC_DEFINE([PNG_ARM_NEON], [1], [Enable ARM NEON optmizations])
+		AC_DEFINE([PNG_ALIGNED_MEMORY_SUPPORTED], [1], [Align row buffers])
+	fi])
+AM_CONDITIONAL([PNG_ARM_NEON], [test "${enable_arm_neon:-no}" = yes])
+
 # Config files, substituting as above
 AC_CONFIG_FILES([Makefile libpng.pc:libpng.pc.in])
 AC_CONFIG_FILES([libpng-config:libpng-config.in],
--- a/contrib/pngminim/decoder/pngusr.h
+++ b/contrib/pngminim/decoder/pngusr.h
@@ -19,5 +19,6 @@
 */

 #define PNG_NO_WARNINGS
+#define PNG_ALIGN_TYPE PNG_ALIGN_NONE

 #endif /* MINRDPNGCONF_H */
--- a/contrib/pngminim/encoder/pngusr.h
+++ b/contrib/pngminim/encoder/pngusr.h
@@ -19,5 +19,6 @@
 */

 #define PNG_NO_WARNINGS
+#define PNG_ALIGN_TYPE PNG_ALIGN_NONE

 #endif /* MINWRPNGCONF_H */
--- a/contrib/pngminim/preader/pngusr.h
+++ b/contrib/pngminim/preader/pngusr.h
@@ -19,5 +19,6 @@
 */

 #define PNG_NO_WARNINGS
+#define PNG_ALIGN_TYPE PNG_ALIGN_NONE

 #endif /* MINPRDPNGCONF_H */
--- a/example.c
+++ b/example.c
@@ -2,7 +2,7 @@
 #if 0 /* in case someone actually tries to compile this */

 /* example.c - an example of using libpng
- * Last changed in libpng 1.5.6 [(PENDING RELEASE)]
+ * Last changed in libpng 1.5.6 [November 3, 2011]
 * This file has been placed in the public domain by the authors.
 * Maintained 1998-2011 Glenn Randers-Pehrson
 * Maintained 1996, 1997 Andreas Dilger)
--- a/libpng-manual.txt
+++ b/libpng-manual.txt
@@ -1,6 +1,6 @@
 libpng-manual.txt - A description on how to use and modify libpng

- libpng version 1.5.6beta05 - October 12, 2011
+ libpng version 1.5.7beta01 - November 4, 2011
 Updated and distributed by Glenn Randers-Pehrson
 <glennrp at users.sourceforge.net>
 Copyright (c) 1998-2011 Glenn Randers-Pehrson
@@ -11,7 +11,7 @@ libpng-manual.txt - A description on how to use and modify libpng

 Based on:

- libpng versions 0.97, January 1998, through 1.5.6beta05 - October 12, 2011
+ libpng versions 0.97, January 1998, through 1.5.7beta01 - November 4, 2011
 Updated and distributed by Glenn Randers-Pehrson
 Copyright (c) 1998-2011 Glenn Randers-Pehrson

@@ -4555,6 +4555,9 @@ left parenthesis that follows it:
 We prefer #ifdef and #ifndef to #if defined() and if !defined()
 when there is only one macro being tested.

+We prefer to express integers that are used as bit masks in hex format,
+with an even number of lower-case hex digits (e.g., 0x00, 0xff, 0x0100).
+
 We do not use the TAB character for indentation in the C sources.

 Lines do not exceed 80 characters.
@@ -4563,13 +4566,13 @@ Other rules can be inferred by inspecting the libpng source.

 XIV. Y2K Compliance in libpng

-October 12, 2011
+November 4, 2011

 Since the PNG Development group is an ad-hoc body, we can't make
 an official declaration.

 This is your unofficial assurance that libpng from version 0.71 and
-upward through 1.5.6beta05 are Y2K compliant.  It is my belief that earlier
+upward through 1.5.7beta01 are Y2K compliant.  It is my belief that earlier
 versions were also Y2K compliant.

 Libpng only has three year fields.  One is a 2-byte unsigned integer that
--- a/libpng.3
+++ b/libpng.3
@@ -1,6 +1,6 @@
-.TH LIBPNG 3 "October 12, 2011"
+.TH LIBPNG 3 "November 4, 2011"
 .SH NAME
-libpng \- Portable Network Graphics (PNG) Reference Library 1.5.6beta05
+libpng \- Portable Network Graphics (PNG) Reference Library 1.5.7beta01
 .SH SYNOPSIS
 \fI\fB

@@ -977,7 +977,7 @@ Following is a copy of the libpng-manual.txt file that accompanies libpng.
 .SH LIBPNG.TXT
 libpng-manual.txt - A description on how to use and modify libpng

- libpng version 1.5.6beta05 - October 12, 2011
+ libpng version 1.5.7beta01 - November 4, 2011
 Updated and distributed by Glenn Randers-Pehrson
 <glennrp at users.sourceforge.net>
 Copyright (c) 1998-2011 Glenn Randers-Pehrson
@@ -988,7 +988,7 @@ libpng-manual.txt - A description on how to use and modify libpng

 Based on:

- libpng versions 0.97, January 1998, through 1.5.6beta05 - October 12, 2011
+ libpng versions 0.97, January 1998, through 1.5.7beta01 - November 4, 2011
 Updated and distributed by Glenn Randers-Pehrson
 Copyright (c) 1998-2011 Glenn Randers-Pehrson

@@ -5533,6 +5533,9 @@ left parenthesis that follows it:
 We prefer #ifdef and #ifndef to #if defined() and if !defined()
 when there is only one macro being tested.

+We prefer to express integers that are used as bit masks in hex format,
+with an even number of lower-case hex digits (e.g., 0x00, 0xff, 0x0100).
+
 We do not use the TAB character for indentation in the C sources.

 Lines do not exceed 80 characters.
@@ -5541,13 +5544,13 @@ Other rules can be inferred by inspecting the libpng source.

 .SH XIV. Y2K Compliance in libpng

-October 12, 2011
+November 4, 2011

 Since the PNG Development group is an ad-hoc body, we can't make
 an official declaration.

 This is your unofficial assurance that libpng from version 0.71 and
-upward through 1.5.6beta05 are Y2K compliant.  It is my belief that earlier
+upward through 1.5.7beta01 are Y2K compliant.  It is my belief that earlier
 versions were also Y2K compliant.

 Libpng only has three year fields.  One is a 2-byte unsigned integer that
@@ -5746,7 +5749,10 @@ the first widely used release:
 1.5.5beta01-08      15    10505  15.so.15.5[.0]
 1.5.5rc01           15    10505  15.so.15.5[.0]
 1.5.5               15    10505  15.so.15.5[.0]
- 1.5.6beta01-05      15    10506  15.so.15.6[.0]
+ 1.5.6beta01-07      15    10506  15.so.15.6[.0]
+ 1.5.6rc01-03        15    10506  15.so.15.6[.0]
+ 1.5.6               15    10506  15.so.15.6[.0]
+ 1.5.7beta01         15    10507  15.so.15.7[.0]

 Henceforth the source version will match the shared-library minor
 and patch numbers; the shared-library major version number will be
@@ -5803,7 +5809,7 @@ possible without all of you.

 Thanks to Frank J. T. Wojcik for helping with the documentation.

-Libpng version 1.5.6beta05 - October 12, 2011:
+Libpng version 1.5.7beta01 - November 4, 2011:
 Initially created in 1995 by Guy Eric Schalnat, then of Group 42, Inc.
 Currently maintained by Glenn Randers-Pehrson (glennrp at users.sourceforge.net).

@@ -5826,7 +5832,7 @@ this sentence.

 This code is released under the libpng license.

-libpng versions 1.2.6, August 15, 2004, through 1.5.6beta05, October 12, 2011, are
+libpng versions 1.2.6, August 15, 2004, through 1.5.7beta01, November 4, 2011, are
 Copyright (c) 2004,2006-2007 Glenn Randers-Pehrson, and are
 distributed according to the same disclaimer and license as libpng-1.2.5
 with the following individual added to the list of Contributing Authors
@@ -5925,7 +5931,7 @@ certification mark of the Open Source Initiative.

 Glenn Randers-Pehrson
 glennrp at users.sourceforge.net
-October 12, 2011
+November 4, 2011

 .\" end of man page

--- a/libpngpf.3
+++ b/libpngpf.3
@@ -1,6 +1,6 @@
-.TH LIBPNGPF 3 "October 12, 2011"
+.TH LIBPNGPF 3 "November 4, 2011"
 .SH NAME
-libpng \- Portable Network Graphics (PNG) Reference Library 1.5.6beta05
+libpng \- Portable Network Graphics (PNG) Reference Library 1.5.7beta01
 (private functions)
 .SH SYNOPSIS
 \fB#include \fI"pngpriv.h"
--- a/png.5
+++ b/png.5
@@ -1,4 +1,4 @@
-.TH PNG 5 "October 12, 2011"
+.TH PNG 5 "November 4, 2011"
 .SH NAME
 png \- Portable Network Graphics (PNG) format
 .SH DESCRIPTION
--- a/png.c
+++ b/png.c
@@ -1,7 +1,7 @@

 /* png.c - location for general purpose libpng functions
 *
- * Last changed in libpng 1.5.6 [(PENDING RELEASE)]
+ * Last changed in libpng 1.5.6 [November 3, 2011]
 * Copyright (c) 1998-2011 Glenn Randers-Pehrson
 * (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger)
 * (Version 0.88 Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.)
@@ -14,7 +14,7 @@
 #include "pngpriv.h"

 /* Generate a compiler error if there is an old png.h in the search path. */
-typedef png_libpng_version_1_5_6beta05 Your_png_h_is_not_version_1_5_6beta05;
+typedef png_libpng_version_1_5_7beta01 Your_png_h_is_not_version_1_5_7beta01;

 /* Tells libpng that we have already handled the first "num_bytes" bytes
 * of the PNG file signature.  If the PNG data is embedded into another
@@ -645,13 +645,13 @@ png_get_copyright(png_const_structp png_ptr)
 #else
 #  ifdef __STDC__
   return PNG_STRING_NEWLINE \
-     "libpng version 1.5.6beta05 - October 12, 2011" PNG_STRING_NEWLINE \
+     "libpng version 1.5.7beta01 - November 4, 2011" PNG_STRING_NEWLINE \
     "Copyright (c) 1998-2011 Glenn Randers-Pehrson" PNG_STRING_NEWLINE \
     "Copyright (c) 1996-1997 Andreas Dilger" PNG_STRING_NEWLINE \
     "Copyright (c) 1995-1996 Guy Eric Schalnat, Group 42, Inc." \
     PNG_STRING_NEWLINE;
 #  else
-      return "libpng version 1.5.6beta05 - October 12, 2011\
+      return "libpng version 1.5.7beta01 - November 4, 2011\
      Copyright (c) 1998-2011 Glenn Randers-Pehrson\
      Copyright (c) 1996-1997 Andreas Dilger\
      Copyright (c) 1995-1996 Guy Eric Schalnat, Group 42, Inc.";
@@ -2663,6 +2663,60 @@ png_build_8bit_table(png_structp png_ptr, png_bytepp ptable,
      table[i] = (png_byte)i;
 }

+/* Used from png_read_destroy and below to release the memory used by the gamma
+ * tables.
+ */
+void /* PRIVATE */
+png_destroy_gamma_table(png_structp png_ptr)
+{
+   png_free(png_ptr, png_ptr->gamma_table);
+   png_ptr->gamma_table = NULL;
+
+   if (png_ptr->gamma_16_table != NULL)
+   {
+      int i;
+      int istop = (1 << (8 - png_ptr->gamma_shift));
+      for (i = 0; i < istop; i++)
+      {
+         png_free(png_ptr, png_ptr->gamma_16_table[i]);
+      }
+   png_free(png_ptr, png_ptr->gamma_16_table);
+   png_ptr->gamma_16_table = NULL;
+   }
+
+#if defined(PNG_READ_BACKGROUND_SUPPORTED) || \
+   defined(PNG_READ_ALPHA_MODE_SUPPORTED) || \
+   defined(PNG_READ_RGB_TO_GRAY_SUPPORTED)
+   png_free(png_ptr, png_ptr->gamma_from_1);
+   png_ptr->gamma_from_1 = NULL;
+   png_free(png_ptr, png_ptr->gamma_to_1);
+   png_ptr->gamma_to_1 = NULL;
+
+   if (png_ptr->gamma_16_from_1 != NULL)
+   {
+      int i;
+      int istop = (1 << (8 - png_ptr->gamma_shift));
+      for (i = 0; i < istop; i++)
+      {
+         png_free(png_ptr, png_ptr->gamma_16_from_1[i]);
+      }
+   png_free(png_ptr, png_ptr->gamma_16_from_1);
+   png_ptr->gamma_16_from_1 = NULL;
+   }
+   if (png_ptr->gamma_16_to_1 != NULL)
+   {
+      int i;
+      int istop = (1 << (8 - png_ptr->gamma_shift));
+      for (i = 0; i < istop; i++)
+      {
+         png_free(png_ptr, png_ptr->gamma_16_to_1[i]);
+      }
+   png_free(png_ptr, png_ptr->gamma_16_to_1);
+   png_ptr->gamma_16_to_1 = NULL;
+   }
+#endif /* READ_BACKGROUND || READ_ALPHA_MODE || RGB_TO_GRAY */
+}
+
 /* We build the 8- or 16-bit gamma tables here.  Note that for 16-bit
 * tables, we don't make a full table if we are reducing to 8-bit in
 * the future.  Note also how the gamma_16 tables are segmented so that
@@ -2673,6 +2727,18 @@ png_build_gamma_table(png_structp png_ptr, int bit_depth)
 {
  png_debug(1, "in png_build_gamma_table");

+  /* Remove any existing table; this copes with multiple calls to
+   * png_read_update_info.  The warning is because building the gamma tables
+   * multiple times is a performance hit - it's harmless but the ability to call
+   * png_read_update_info() multiple times is new in 1.5.6 so it seems sensible
+   * to warn if the app introduces such a hit.
+   */
+  if (png_ptr->gamma_table != NULL || png_ptr->gamma_16_table != NULL)
+  {
+    png_warning(png_ptr, "gamma table being rebuilt");
+    png_destroy_gamma_table(png_ptr);
+  }
+
  if (bit_depth <= 8)
  {
     png_build_8bit_table(png_ptr, &png_ptr->gamma_table,
--- a/png.h
+++ b/png.h
@@ -1,7 +1,7 @@

 /* png.h - header file for PNG reference library
 *
- * libpng version 1.5.6beta05 - October 12, 2011
+ * libpng version 1.5.7beta01 - November 4, 2011
 * Copyright (c) 1998-2011 Glenn Randers-Pehrson
 * (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger)
 * (Version 0.88 Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.)
@@ -11,7 +11,7 @@
 * Authors and maintainers:
 *   libpng versions 0.71, May 1995, through 0.88, January 1996: Guy Schalnat
 *   libpng versions 0.89c, June 1996, through 0.96, May 1997: Andreas Dilger
- *   libpng versions 0.97, January 1998, through 1.5.6beta05 - October 12, 2011: Glenn
+ *   libpng versions 0.97, January 1998, through 1.5.7beta01 - November 4, 2011: Glenn
 *   See also "Contributing Authors", below.
 *
 * Note about libpng version numbers:
@@ -160,7 +160,10 @@
 *    1.5.5beta01-08          15    10505  15.so.15.5[.0]
 *    1.5.5rc01               15    10505  15.so.15.5[.0]
 *    1.5.5                   15    10505  15.so.15.5[.0]
- *    1.5.6beta01-05          15    10506  15.so.15.6[.0]
+ *    1.5.6beta01-07          15    10506  15.so.15.6[.0]
+ *    1.5.6rc01-03            15    10506  15.so.15.6[.0]
+ *    1.5.6                   15    10506  15.so.15.6[.0]
+ *    1.5.7beta01             15    10507  15.so.15.7[.0]
 *
 *   Henceforth the source version will match the shared-library major
 *   and minor numbers; the shared-library major version number will be
@@ -192,7 +195,7 @@
 *
 * This code is released under the libpng license.
 *
- * libpng versions 1.2.6, August 15, 2004, through 1.5.6beta05, October 12, 2011, are
+ * libpng versions 1.2.6, August 15, 2004, through 1.5.7beta01, November 4, 2011, are
 * Copyright (c) 2004, 2006-2011 Glenn Randers-Pehrson, and are
 * distributed according to the same disclaimer and license as libpng-1.2.5
 * with the following individual added to the list of Contributing Authors:
@@ -304,13 +307,13 @@
 * Y2K compliance in libpng:
 * =========================
 *
- *    October 12, 2011
+ *    November 4, 2011
 *
 *    Since the PNG Development group is an ad-hoc body, we can't make
 *    an official declaration.
 *
 *    This is your unofficial assurance that libpng from version 0.71 and
- *    upward through 1.5.6beta05 are Y2K compliant.  It is my belief that
+ *    upward through 1.5.7beta01 are Y2K compliant.  It is my belief that
 *    earlier versions were also Y2K compliant.
 *
 *    Libpng only has two year fields.  One is a 2-byte unsigned integer
@@ -365,9 +368,9 @@
 */

 /* Version information for png.h - this should match the version in png.c */
-#define PNG_LIBPNG_VER_STRING "1.5.6beta05"
+#define PNG_LIBPNG_VER_STRING "1.5.7beta01"
 #define PNG_HEADER_VERSION_STRING \
-     " libpng version 1.5.6beta05 - October 12, 2011\n"
+     " libpng version 1.5.7beta01 - November 4, 2011\n"

 #define PNG_LIBPNG_VER_SONUM   15
 #define PNG_LIBPNG_VER_DLLNUM  15
@@ -375,12 +378,12 @@
 /* These should match the first 3 components of PNG_LIBPNG_VER_STRING: */
 #define PNG_LIBPNG_VER_MAJOR   1
 #define PNG_LIBPNG_VER_MINOR   5
-#define PNG_LIBPNG_VER_RELEASE 6
+#define PNG_LIBPNG_VER_RELEASE 7
 /* This should match the numeric part of the final component of
 * PNG_LIBPNG_VER_STRING, omitting any leading zero:
 */

-#define PNG_LIBPNG_VER_BUILD  05
+#define PNG_LIBPNG_VER_BUILD  01

 /* Release Status */
 #define PNG_LIBPNG_BUILD_ALPHA    1
@@ -405,7 +408,7 @@
 * version 1.0.0 was mis-numbered 100 instead of 10000).  From
 * version 1.0.1 it's    xxyyzz, where x=major, y=minor, z=release
 */
-#define PNG_LIBPNG_VER 10506 /* 1.5.6 */
+#define PNG_LIBPNG_VER 10507 /* 1.5.7 */

 /* Library configuration: these options cannot be changed after
 * the library has been built.
@@ -527,7 +530,7 @@ extern "C" {
 /* This triggers a compiler error in png.c, if png.c and png.h
 * do not agree upon the version number.
 */
-typedef char* png_libpng_version_1_5_6beta05;
+typedef char* png_libpng_version_1_5_7beta01;

 /* Three color definitions.  The order of the red, green, and blue, (and the
 * exact size) is not important, although the size of the fields need to
--- a/pngconf.h
+++ b/pngconf.h
@@ -1,7 +1,7 @@

 /* pngconf.h - machine configurable file for libpng
 *
- * libpng version 1.5.6beta05 - October 12, 2011
+ * libpng version 1.5.7beta01 - November 4, 2011
 *
 * Copyright (c) 1998-2011 Glenn Randers-Pehrson
 * (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger)
--- a/pngerror.c
+++ b/pngerror.c
@@ -1,7 +1,7 @@

 /* pngerror.c - stub functions for i/o and memory allocation
 *
- * Last changed in libpng 1.5.6 [(PENDING RELEASE)]
+ * Last changed in libpng 1.5.6 [November 3, 2011]
 * Copyright (c) 1998-2011 Glenn Randers-Pehrson
 * (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger)
 * (Version 0.88 Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.)
--- a/pngget.c
+++ b/pngget.c
@@ -1,7 +1,7 @@

 /* pngget.c - retrieval of values from info struct
 *
- * Last changed in libpng 1.5.6 [(PENDING RELEASE)]
+ * Last changed in libpng 1.5.6 [November 3, 2011]
 * Copyright (c) 1998-2011 Glenn Randers-Pehrson
 * (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger)
 * (Version 0.88 Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.)
@@ -1068,7 +1068,6 @@ png_get_compression_buffer_size(png_const_structp png_ptr)
   return (png_ptr ? png_ptr->zbuf_size : 0);
 }

-
 #ifdef PNG_SET_USER_LIMITS_SUPPORTED
 /* These functions were added to libpng 1.2.6 and were enabled
 * by default in libpng-1.4.0 */
--- a/pngmem.c
+++ b/pngmem.c
@@ -1,7 +1,7 @@

 /* pngmem.c - stub functions for memory allocation
 *
- * Last changed in libpng 1.5.4 [July 7, 2011]
+ * Last changed in libpng 1.5.7 [(PENDING RELEASE)]
 * Copyright (c) 1998-2011 Glenn Randers-Pehrson
 * (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger)
 * (Version 0.88 Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.)
@@ -56,9 +56,9 @@ png_create_struct_2,(int type, png_malloc_ptr malloc_fn, png_voidp mem_ptr),
   if (malloc_fn != NULL)
   {
      png_struct dummy_struct;
-      png_structp png_ptr = &dummy_struct;
-      png_ptr->mem_ptr=mem_ptr;
-      struct_ptr = (*(malloc_fn))(png_ptr, (png_uint_32)size);
+      memset(&dummy_struct, 0, sizeof dummy_struct);
+      dummy_struct.mem_ptr=mem_ptr;
+      struct_ptr = (*(malloc_fn))(&dummy_struct, (png_alloc_size_t)size);
   }

   else
@@ -90,9 +90,9 @@ png_destroy_struct_2(png_voidp struct_ptr, png_free_ptr free_fn,
      if (free_fn != NULL)
      {
         png_struct dummy_struct;
-         png_structp png_ptr = &dummy_struct;
-         png_ptr->mem_ptr=mem_ptr;
-         (*(free_fn))(png_ptr, struct_ptr);
+         memset(&dummy_struct, 0, sizeof dummy_struct);
+         dummy_struct.mem_ptr=mem_ptr;
+         (*(free_fn))(&dummy_struct, struct_ptr);
         return;
      }

@@ -143,7 +143,7 @@ png_malloc,(png_structp png_ptr, png_alloc_size_t size),PNG_ALLOCATED)

 #  ifdef PNG_USER_MEM_SUPPORTED
   if (png_ptr->malloc_fn != NULL)
-      ret = ((png_voidp)(*(png_ptr->malloc_fn))(png_ptr, (png_size_t)size));
+      ret = ((png_voidp)(*(png_ptr->malloc_fn))(png_ptr, size));

   else
      ret = (png_malloc_default(png_ptr, size));
--- a/pngpread.c
+++ b/pngpread.c
@@ -1,7 +1,7 @@

 /* pngpread.c - read a png file in push mode
 *
- * Last changed in libpng 1.5.6 [(PENDING RELEASE)]
+ * Last changed in libpng 1.5.7 [(PENDING RELEASE)]
 * Copyright (c) 1998-2011 Glenn Randers-Pehrson
 * (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger)
 * (Version 0.88 Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.)
@@ -985,7 +985,7 @@ png_push_process_row(png_structp png_ptr)
   if (png_ptr->row_buf[0] > PNG_FILTER_VALUE_NONE)
   {
      if (png_ptr->row_buf[0] < PNG_FILTER_VALUE_LAST)
-         png_read_filter_row(&row_info, png_ptr->row_buf + 1,
+         png_read_filter_row(png_ptr, &row_info, png_ptr->row_buf + 1,
            png_ptr->prev_row + 1, png_ptr->row_buf[0]);
      else
         png_error(png_ptr, "bad adaptive filter value");
--- a/pngpriv.h
+++ b/pngpriv.h
@@ -6,7 +6,7 @@
 * (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger)
 * (Version 0.88 Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.)
 *
- * Last changed in libpng 1.5.6 [(PENDING RELEASE)]
+ * Last changed in libpng 1.5.7 [(PENDING RELEASE)]
 *
 * This code is released under the libpng license.
 * For conditions of distribution and use, see the disclaimer
@@ -922,9 +922,24 @@ PNG_EXTERN void png_do_write_interlace PNGARG((png_row_infop row_info,
 /* Unfilter a row: check the filter value before calling this, there is no point
 * calling it for PNG_FILTER_VALUE_NONE.
 */
-PNG_EXTERN void png_read_filter_row PNGARG((png_row_infop row_info,
+PNG_EXTERN void png_read_filter_row PNGARG((png_structp pp, png_row_infop row_info,
    png_bytep row, png_const_bytep prev_row, int filter));

+PNG_EXTERN void png_read_filter_row_up_neon PNGARG((png_row_infop row_info,
+    png_bytep row, png_const_bytep prev_row));
+PNG_EXTERN void png_read_filter_row_sub3_neon PNGARG((png_row_infop row_info,
+    png_bytep row, png_const_bytep prev_row));
+PNG_EXTERN void png_read_filter_row_sub4_neon PNGARG((png_row_infop row_info,
+    png_bytep row, png_const_bytep prev_row));
+PNG_EXTERN void png_read_filter_row_avg3_neon PNGARG((png_row_infop row_info,
+    png_bytep row, png_const_bytep prev_row));
+PNG_EXTERN void png_read_filter_row_avg4_neon PNGARG((png_row_infop row_info,
+    png_bytep row, png_const_bytep prev_row));
+PNG_EXTERN void png_read_filter_row_paeth3_neon PNGARG((png_row_infop row_info,
+    png_bytep row, png_const_bytep prev_row));
+PNG_EXTERN void png_read_filter_row_paeth4_neon PNGARG((png_row_infop row_info,
+    png_bytep row, png_const_bytep prev_row));
+
 /* Choose the best filter to use and filter the row data */
 PNG_EXTERN void png_write_find_filter PNGARG((png_structp png_ptr,
    png_row_infop row_info));
@@ -1568,6 +1583,7 @@ PNG_EXTERN png_uint_16 png_gamma_16bit_correct PNGARG((unsigned int value,
    png_fixed_point gamma_value));
 PNG_EXTERN png_byte png_gamma_8bit_correct PNGARG((unsigned int value,
    png_fixed_point gamma_value));
+PNG_EXTERN void png_destroy_gamma_table(png_structp png_ptr);
 PNG_EXTERN void png_build_gamma_table PNGARG((png_structp png_ptr,
    int bit_depth));
 #endif
--- a/pngread.c
+++ b/pngread.c
@@ -1,7 +1,7 @@

 /* pngread.c - read a PNG file
 *
- * Last changed in libpng 1.5.6 [(PENDING RELEASE)]
+ * Last changed in libpng 1.5.7 [(PENDING RELEASE)]
 * Copyright (c) 1998-2011 Glenn Randers-Pehrson
 * (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger)
 * (Version 0.88 Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.)
@@ -348,13 +348,7 @@ png_read_update_info(png_structp png_ptr, png_infop info_ptr)
   if (png_ptr == NULL)
      return;

-   if (!(png_ptr->flags & PNG_FLAG_ROW_INIT))
-      png_read_start_row(png_ptr);
-
-   else
-      png_warning(png_ptr,
-          "Ignoring extra png_read_update_info() call;"
-          " row buffer not reallocated");
+   png_read_start_row(png_ptr);

 #ifdef PNG_READ_TRANSFORMS_SUPPORTED
   png_read_transform_info(png_ptr, info_ptr);
@@ -374,15 +368,8 @@ png_start_read_image(png_structp png_ptr)
 {
   png_debug(1, "in png_start_read_image");

-   if (png_ptr == NULL)
-      return;
-
-   if (!(png_ptr->flags & PNG_FLAG_ROW_INIT))
-      png_read_start_row(png_ptr);
-   else
-      png_warning(png_ptr,
-          "Ignoring extra png_start_read_image() call;"
-          " row buffer not reallocated");
+   if (png_ptr != NULL)
+     png_read_start_row(png_ptr);
 }
 #endif /* PNG_SEQUENTIAL_READ_SUPPORTED */

@@ -591,7 +578,7 @@ png_read_row(png_structp png_ptr, png_bytep row, png_bytep dsp_row)
   if (png_ptr->row_buf[0] > PNG_FILTER_VALUE_NONE)
   {
      if (png_ptr->row_buf[0] < PNG_FILTER_VALUE_LAST)
-         png_read_filter_row(&row_info, png_ptr->row_buf + 1,
+         png_read_filter_row(png_ptr, &row_info, png_ptr->row_buf + 1,
            png_ptr->prev_row + 1, png_ptr->row_buf[0]);
      else
         png_error(png_ptr, "bad adaptive filter value");
@@ -1045,9 +1032,13 @@ png_read_destroy(png_structp png_ptr, png_infop info_ptr,
   if (end_info_ptr != NULL)
      png_info_destroy(png_ptr, end_info_ptr);

+#ifdef PNG_READ_GAMMA_SUPPORTED
+   png_destroy_gamma_table(png_ptr);
+#endif
+
   png_free(png_ptr, png_ptr->zbuf);
   png_free(png_ptr, png_ptr->big_row_buf);
-   png_free(png_ptr, png_ptr->prev_row);
+   png_free(png_ptr, png_ptr->big_prev_row);
   png_free(png_ptr, png_ptr->chunkdata);

 #ifdef PNG_READ_QUANTIZE_SUPPORTED
@@ -1055,15 +1046,6 @@ png_read_destroy(png_structp png_ptr, png_infop info_ptr,
   png_free(png_ptr, png_ptr->quantize_index);
 #endif

-#ifdef PNG_READ_GAMMA_SUPPORTED
-   png_free(png_ptr, png_ptr->gamma_table);
-#endif
-
-#ifdef PNG_READ_BACKGROUND_SUPPORTED
-   png_free(png_ptr, png_ptr->gamma_from_1);
-   png_free(png_ptr, png_ptr->gamma_to_1);
-#endif
-
   if (png_ptr->free_me & PNG_FREE_PLTE)
      png_zfree(png_ptr, png_ptr->palette);
   png_ptr->free_me &= ~PNG_FREE_PLTE;
@@ -1081,42 +1063,6 @@ png_read_destroy(png_structp png_ptr, png_infop info_ptr,
   png_ptr->free_me &= ~PNG_FREE_HIST;
 #endif

-#ifdef PNG_READ_GAMMA_SUPPORTED
-   if (png_ptr->gamma_16_table != NULL)
-   {
-      int i;
-      int istop = (1 << (8 - png_ptr->gamma_shift));
-      for (i = 0; i < istop; i++)
-      {
-         png_free(png_ptr, png_ptr->gamma_16_table[i]);
-      }
-   png_free(png_ptr, png_ptr->gamma_16_table);
-   }
-
-#ifdef PNG_READ_BACKGROUND_SUPPORTED
-   if (png_ptr->gamma_16_from_1 != NULL)
-   {
-      int i;
-      int istop = (1 << (8 - png_ptr->gamma_shift));
-      for (i = 0; i < istop; i++)
-      {
-         png_free(png_ptr, png_ptr->gamma_16_from_1[i]);
-      }
-   png_free(png_ptr, png_ptr->gamma_16_from_1);
-   }
-   if (png_ptr->gamma_16_to_1 != NULL)
-   {
-      int i;
-      int istop = (1 << (8 - png_ptr->gamma_shift));
-      for (i = 0; i < istop; i++)
-      {
-         png_free(png_ptr, png_ptr->gamma_16_to_1[i]);
-      }
-   png_free(png_ptr, png_ptr->gamma_16_to_1);
-   }
-#endif
-#endif
-
   inflateEnd(&png_ptr->zstream);

 #ifdef PNG_PROGRESSIVE_READ_SUPPORTED
--- a/pngrtran.c
+++ b/pngrtran.c
@@ -1,7 +1,7 @@

 /* pngrtran.c - transforms the data in a row for PNG readers
 *
- * Last changed in libpng 1.5.6 [(PENDING RELEASE)]
+ * Last changed in libpng 1.5.6 [November 3, 2011]
 * Copyright (c) 1998-2011 Glenn Randers-Pehrson
 * (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger)
 * (Version 0.88 Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.)
@@ -1641,8 +1641,9 @@ png_init_read_transformations(png_structp png_ptr)
         /* if (png_ptr->background_gamma_type!=PNG_BACKGROUND_GAMMA_UNKNOWN) */
         else /* color_type != PNG_COLOR_TYPE_PALETTE */
         {
-            png_fixed_point g = PNG_FP_1;
-            png_fixed_point gs = PNG_FP_1;
+            int gs_sig, g_sig;
+            png_fixed_point g = PNG_FP_1;  /* Correction to linear */
+            png_fixed_point gs = PNG_FP_1; /* Correction to screen */

            switch (png_ptr->background_gamma_type)
            {
@@ -1666,34 +1667,45 @@ png_init_read_transformations(png_structp png_ptr)
                  png_error(png_ptr, "invalid background gamma type");
            }

-            png_ptr->background_1.gray = png_gamma_correct(png_ptr,
-                png_ptr->background.gray, g);
+            g_sig = png_gamma_significant(g);
+            gs_sig = png_gamma_significant(gs);

-            png_ptr->background.gray = png_gamma_correct(png_ptr,
-                png_ptr->background.gray, gs);
+            if (g_sig)
+               png_ptr->background_1.gray = png_gamma_correct(png_ptr,
+                   png_ptr->background.gray, g);
+
+            if (gs_sig)
+               png_ptr->background.gray = png_gamma_correct(png_ptr,
+                   png_ptr->background.gray, gs);

            if ((png_ptr->background.red != png_ptr->background.green) ||
                (png_ptr->background.red != png_ptr->background.blue) ||
                (png_ptr->background.red != png_ptr->background.gray))
            {
               /* RGB or RGBA with color background */
-               png_ptr->background_1.red = png_gamma_correct(png_ptr,
-                   png_ptr->background.red, g);
+               if (g_sig)
+               {
+                  png_ptr->background_1.red = png_gamma_correct(png_ptr,
+                      png_ptr->background.red, g);

-               png_ptr->background_1.green = png_gamma_correct(png_ptr,
-                   png_ptr->background.green, g);
+                  png_ptr->background_1.green = png_gamma_correct(png_ptr,
+                      png_ptr->background.green, g);

-               png_ptr->background_1.blue = png_gamma_correct(png_ptr,
-                   png_ptr->background.blue, g);
+                  png_ptr->background_1.blue = png_gamma_correct(png_ptr,
+                      png_ptr->background.blue, g);
+               }

-               png_ptr->background.red = png_gamma_correct(png_ptr,
-                   png_ptr->background.red, gs);
+               if (gs_sig)
+               {
+                  png_ptr->background.red = png_gamma_correct(png_ptr,
+                      png_ptr->background.red, gs);

-               png_ptr->background.green = png_gamma_correct(png_ptr,
-                   png_ptr->background.green, gs);
+                  png_ptr->background.green = png_gamma_correct(png_ptr,
+                      png_ptr->background.green, gs);

-               png_ptr->background.blue = png_gamma_correct(png_ptr,
-                   png_ptr->background.blue, gs);
+                  png_ptr->background.blue = png_gamma_correct(png_ptr,
+                      png_ptr->background.blue, gs);
+               }
            }

            else
@@ -1705,6 +1717,9 @@ png_init_read_transformations(png_structp png_ptr)
               png_ptr->background.red = png_ptr->background.green
                   = png_ptr->background.blue = png_ptr->background.gray;
            }
+
+            /* The background is now in screen gamma: */
+            png_ptr->background_gamma_type = PNG_BACKGROUND_GAMMA_SCREEN;
         } /* color_type != PNG_COLOR_TYPE_PALETTE */
      }/* png_ptr->transformations & PNG_BACKGROUND */

@@ -2469,8 +2484,8 @@ png_do_unshift(png_row_infop row_info, png_bytep row,

            while (bp < bp_end)
            {
-               int byte = (*bp >> 1) & 0x55;
-               *bp++ = (png_byte)byte;
+               int b = (*bp >> 1) & 0x55;
+               *bp++ = (png_byte)b;
            }
            break;
         }
@@ -2488,8 +2503,8 @@ png_do_unshift(png_row_infop row_info, png_bytep row,

            while (bp < bp_end)
            {
-               int byte = (*bp >> gray_shift) & mask;
-               *bp++ = (png_byte)byte;
+               int b = (*bp >> gray_shift) & mask;
+               *bp++ = (png_byte)b;
            }
            break;
         }
@@ -2503,10 +2518,10 @@ png_do_unshift(png_row_infop row_info, png_bytep row,

            while (bp < bp_end)
            {
-               int byte = *bp >> shift[channel];
+               int b = *bp >> shift[channel];
               if (++channel >= channels)
                  channel = 0;
-               *bp++ = (png_byte)byte;
+               *bp++ = (png_byte)b;
            }
            break;
         }
@@ -3404,7 +3419,8 @@ png_build_grayscale_palette(int bit_depth, png_colorp palette)


 #ifdef PNG_READ_TRANSFORMS_SUPPORTED
-#ifdef PNG_READ_BACKGROUND_SUPPORTED
+#if (defined PNG_READ_BACKGROUND_SUPPORTED) ||\
+   (defined PNG_READ_ALPHA_MODE_SUPPORTED)
 /* Replace any alpha or transparency with the supplied background color.
 * "background" is already in the screen gamma, while "background_1" is
 * at a gamma of 1.0.  Paletted files have already been taken care of.
@@ -4112,7 +4128,7 @@ png_do_compose(png_row_infop row_info, png_bytep row, png_structp png_ptr)
      }
   }
 }
-#endif
+#endif /* PNG_READ_BACKGROUND_SUPPORTED || PNG_READ_ALPHA_MODE_SUPPORTED */

 #ifdef PNG_READ_GAMMA_SUPPORTED
 /* Gamma correct the image, avoiding the alpha channel.  Make sure
--- a/pngrutil.c
+++ b/pngrutil.c
@@ -1,7 +1,7 @@

 /* pngrutil.c - utilities to read a PNG file
 *
- * Last changed in libpng 1.5.6 [(PENDING RELEASE)]
+ * Last changed in libpng 1.5.7 [(PENDING RELEASE)]
 * Copyright (c) 1998-2011 Glenn Randers-Pehrson
 * (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger)
 * (Version 0.88 Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.)
@@ -301,7 +301,7 @@ png_inflate(png_structp png_ptr, png_bytep data, png_size_t size,
   {
      int ret, avail;

-      /* The setting of 'avail_in' used to be outside the loop, by setting it
+      /* The setting of 'avail_in' used to be outside the loop; by setting it
       * inside it is possible to chunk the input to zlib and simply rely on
       * zlib to advance the 'next_in' pointer.  This allows arbitrary amounts o
       * data to be passed through zlib at the unavoidable cost of requiring a
@@ -941,7 +941,7 @@ png_handle_cHRM(png_structp png_ptr, png_infop info_ptr, png_uint_32 length)

   else if (png_ptr->mode & PNG_HAVE_PLTE)
      /* Should be an error, but we can cope with it */
-      png_warning(png_ptr, "Missing PLTE before cHRM");
+      png_warning(png_ptr, "Out of place cHRM chunk");

   if (info_ptr != NULL && (info_ptr->valid & PNG_INFO_cHRM)
 #  ifdef PNG_READ_sRGB_SUPPORTED
@@ -2786,6 +2786,9 @@ png_combine_row(png_structp png_ptr, png_bytep dp, int display)
   png_const_bytep sp = png_ptr->row_buf + 1;
   png_uint_32 row_width = png_ptr->width;
   unsigned int pass = png_ptr->pass;
+   png_bytep end_ptr = 0;
+   png_byte end_byte = 0;
+   unsigned int end_mask;

   png_debug(1, "in png_combine_row");

@@ -2807,9 +2810,31 @@ png_combine_row(png_structp png_ptr, png_bytep dp, int display)
   if (row_width == 0)
      png_error(png_ptr, "internal row width error");

-   /* This reduces to a memcpy for non-interlaced images and for the case where
-    * interlacing isn't supported or isn't done (in that case the caller gets a
-    * sequence of interlace pass rows.)
+   /* Preserve the last byte in cases where only part of it will be overwritten,
+    * the multiply below may overflow, we don't care because ANSI-C guarantees
+    * we get the low bits.
+    */
+   end_mask = (pixel_depth * row_width) & 7;
+   if (end_mask != 0)
+   {
+      /* end_ptr == NULL is a flag to say do nothing */
+      end_ptr = dp + PNG_ROWBYTES(pixel_depth, row_width) - 1;
+      end_byte = *end_ptr;
+#     ifdef PNG_READ_PACKSWAP_SUPPORTED
+         if (png_ptr->transformations & PNG_PACKSWAP) /* little-endian byte */
+            end_mask = 0xff << end_mask;
+
+         else /* big-endian byte */
+#     endif
+         end_mask = 0xff >> end_mask;
+      /* end_mask is now the bits to *keep* from the destination row */
+   }
+
+   /* For non-interlaced images this reduces to a png_memcpy(). A png_memcpy()
+    * will also happen if interlacing isn't supported or if the application
+    * does not call png_set_interlace_handling().  In the latter cases the
+    * caller just gets a sequence of the unexpanded rows from each interlace
+    * pass.
    */
 #ifdef PNG_READ_INTERLACING_SUPPORTED
   if (png_ptr->interlaced && (png_ptr->transformations & PNG_INTERLACE) &&
@@ -2825,9 +2850,9 @@ png_combine_row(png_structp png_ptr, png_bytep dp, int display)

      if (pixel_depth < 8)
      {
-         /* For pixel depths up to 4bpp the 8-pixel mask can be expanded to fit
+         /* For pixel depths up to 4-bpp the 8-pixel mask can be expanded to fit
          * into 32 bits, then a single loop over the bytes using the four byte
-          * values in the 32 bit mask can be used.  For the 'display' option the
+          * values in the 32-bit mask can be used.  For the 'display' option the
          * expanded mask may also not require any masking within a byte.  To
          * make this work the PACKSWAP option must be taken into account - it
          * simply requires the pixels to be reversed in each byte.
@@ -2846,15 +2871,33 @@ png_combine_row(png_structp png_ptr, png_bytep dp, int display)
          *
          * The following defines allow generation of compile time constant bit
          * masks for each pixel depth and each possibility of swapped or not
-          * swapped bytes.  Pass is in the range 0..6, 'x', a pixel index, is in
-          * the range 0..7, the result is 1 if the pixel is to be copied in the
-          * pass, 0 if not.  'S' is for the sparkle method, 'B' for the block
-          * method.
+          * swapped bytes.  Pass 'p' is in the range 0..6; 'x', a pixel index,
+          * is in the range 0..7; and the result is 1 if the pixel is to be
+          * copied in the pass, 0 if not.  'S' is for the sparkle method, 'B'
+          * for the block method.
+          *
+          * With some compilers a compile time expression of the general form:
+          *
+          *    (shift >= 32) ? (a >> (shift-32)) : (b >> shift)
+          *
+          * Produces warnings with values of 'shift' in the range 33 to 63
+          * because the right hand side of the ?: expression is evaluated by
+          * the compiler even though it isn't used.  Microsoft Visual C (various
+          * versions) and the Intel C compiler are known to do this.  To avoid
+          * this the following macros are used in 1.5.6.  This is a temporary
+          * solution to avoid destablizing the code during the release process.
          */
-#        define S_COPY(p,x) (((p)<4 ? 0x80088822 >> ((3-(p))*8+(7-(x))) :\
-            0xaa55ff00 >> ((7-(p))*8+(7-(x)))) & 1)
-#        define B_COPY(p,x) (((p)<4 ? 0xff0fff33 >> ((3-(p))*8+(7-(x))) :\
-            0xff55ff00 >> ((7-(p))*8+(7-(x)))) & 1)
+#        if PNG_USE_COMPILE_TIME_MASKS
+#           define PNG_LSR(x,s) ((x)>>((s) & 0x1f))
+#           define PNG_LSL(x,s) ((x)<<((s) & 0x1f))
+#        else
+#           define PNG_LSR(x,s) ((x)>>(s))
+#           define PNG_LSL(x,s) ((x)<<(s))
+#        endif
+#        define S_COPY(p,x) (((p)<4 ? PNG_LSR(0x80088822,(3-(p))*8+(7-(x))) :\
+           PNG_LSR(0xaa55ff00,(7-(p))*8+(7-(x)))) & 1)
+#        define B_COPY(p,x) (((p)<4 ? PNG_LSR(0xff0fff33,(3-(p))*8+(7-(x))) :\
+           PNG_LSR(0xff55ff00,(7-(p))*8+(7-(x)))) & 1)

         /* Return a mask for pass 'p' pixel 'x' at depth 'd'.  The mask is
          * little endian - the first pixel is at bit 0 - however the extra
@@ -2862,16 +2905,17 @@ png_combine_row(png_structp png_ptr, png_bytep dp, int display)
          * within each byte, to match the PNG format.  This is done by XOR of
          * the shift with 7, 6 or 4 for bit depths 1, 2 and 4.
          */
-#        define PIXEL_MASK(p,x,d,s) (((1U<<(d))-1)<<(((x)*(d))^((s)?8-(d):0)))
+#        define PIXEL_MASK(p,x,d,s) \
+            (PNG_LSL(((PNG_LSL(1U,(d)))-1),(((x)*(d))^((s)?8-(d):0))))

         /* Hence generate the appropriate 'block' or 'sparkle' pixel copy mask.
          */
 #        define S_MASKx(p,x,d,s) (S_COPY(p,x)?PIXEL_MASK(p,x,d,s):0)
 #        define B_MASKx(p,x,d,s) (B_COPY(p,x)?PIXEL_MASK(p,x,d,s):0)

-         /* Combine 8 of these to get the full mask.  For the 1 and 2 bpp cases
-          * the result needs replicating, for the 4bpp case the above generates
-          * a full 32 bits.
+         /* Combine 8 of these to get the full mask.  For the 1-bpp and 2-bpp
+          * cases the result needs replicating, for the 4-bpp case the above
+          * generates a full 32 bits.
          */
 #        define MASK_EXPAND(m,d) ((m)*((d)==1?0x01010101:((d)==2?0x00010001:1)))

@@ -2949,7 +2993,7 @@ png_combine_row(png_structp png_ptr, png_bytep dp, int display)
            png_uint_32 m;

            /* It doesn't matter in the following if png_uint_32 has more than
-             * 32 bits because the high bits always match those in m<<24, it is,
+             * 32 bits because the high bits always match those in m<<24; it is,
             * however, essential to use OR here, not +, because of this.
             */
            m = mask;
@@ -2965,11 +3009,11 @@ png_combine_row(png_structp png_ptr, png_bytep dp, int display)
            }

            /* NOTE: this may overwrite the last byte with garbage if the image
-             * is not an exact number of bytes wide, libpng has always done
+             * is not an exact number of bytes wide; libpng has always done
             * this.
             */
            if (row_width <= pixels_per_byte)
-               return;
+               break; /* May need to restore part of the last byte */

            row_width -= pixels_per_byte;
            ++dp;
@@ -3021,8 +3065,12 @@ png_combine_row(png_structp png_ptr, png_bytep dp, int display)
         bytes_to_jump = PNG_PASS_COL_OFFSET(pass) * pixel_depth;

         /* And simply copy these bytes.  Some optimization is possible here,
-          * depending on the value of 'bytes_to_copy'.  Speical case the low
+          * depending on the value of 'bytes_to_copy'.  Special case the low
          * byte counts, which we know to be frequent.
+          *
+          * Notice that these cases all 'return' rather than 'break' - this
+          * avoids an unnecessary test on whether to restore the last byte
+          * below.
          */
         switch (bytes_to_copy)
         {
@@ -3040,7 +3088,7 @@ png_combine_row(png_structp png_ptr, png_bytep dp, int display)
               }

            case 2:
-               /* There is a possibility of a partial copy at the end here, this
+               /* There is a possibility of a partial copy at the end here; this
                * slows the code down somewhat.
                */
               do
@@ -3078,12 +3126,12 @@ png_combine_row(png_structp png_ptr, png_bytep dp, int display)

            default:
 #if PNG_ALIGN_TYPE != PNG_ALIGN_NONE
-               /* Check for double byte alignment and, if possible, use a 16
-                * bit copy.  Don't attempt this for narrow images - ones that
+               /* Check for double byte alignment and, if possible, use a
+                * 16-bit copy.  Don't attempt this for narrow images - ones that
                * are less than an interlace panel wide.  Don't attempt it for
-                * wide bytes-to-copy either - use the memcpy there.
+                * wide bytes-to-copy either - use the png_memcpy there.
                */
-               if (bytes_to_copy < 16 /*else use memcpy*/ &&
+               if (bytes_to_copy < 16 /*else use png_memcpy*/ &&
                  png_isaligned(dp, png_uint_16) &&
                  png_isaligned(sp, png_uint_16) &&
                  bytes_to_copy % sizeof (png_uint_16) == 0 &&
@@ -3123,7 +3171,7 @@ png_combine_row(png_structp png_ptr, png_bytep dp, int display)

                     /* Get to here when the row_width truncates the final copy.
                      * There will be 1-3 bytes left to copy, so don't try the
-                      * 16bit loop below.
+                      * 16-bit loop below.
                      */
                     dp = (png_bytep)dp32;
                     sp = (png_const_bytep)sp32;
@@ -3133,7 +3181,7 @@ png_combine_row(png_structp png_ptr, png_bytep dp, int display)
                     return;
                  }

-                  /* Else do it in 16 bit quantities, but only if the size is
+                  /* Else do it in 16-bit quantities, but only if the size is
                   * not too large.
                   */
                  else
@@ -3162,7 +3210,7 @@ png_combine_row(png_structp png_ptr, png_bytep dp, int display)
                     }
                     while (bytes_to_copy <= row_width);

-                     /* End of row - 1 byte left, bytes_to_copy>row_width: */
+                     /* End of row - 1 byte left, bytes_to_copy > row_width: */
                     dp = (png_bytep)dp16;
                     sp = (png_const_bytep)sp16;
                     do
@@ -3173,7 +3221,7 @@ png_combine_row(png_structp png_ptr, png_bytep dp, int display)
               }
 #endif /* PNG_ALIGN_ code */

-               /* The true default - use a memcpy: */
+               /* The true default - use a png_memcpy: */
               for (;;)
               {
                  png_memcpy(dp, sp, bytes_to_copy);
@@ -3188,18 +3236,24 @@ png_combine_row(png_structp png_ptr, png_bytep dp, int display)
                     bytes_to_copy = row_width;
               }
         }
+
+         /* NOT REACHED*/
      } /* pixel_depth >= 8 */

-      /* NOT REACHED*/
+      /* Here if pixel_depth < 8 to check 'end_ptr' below. */
   }
   else
 #endif

-   /* If here then the switch above wasn't used so just memcpy the whole row
+   /* If here then the switch above wasn't used so just png_memcpy the whole row
    * from the temporary row buffer (notice that this overwrites the end of the
    * destination row if it is a partial byte.)
    */
   png_memcpy(dp, sp, PNG_ROWBYTES(pixel_depth, row_width));
+
+   /* Restore the overwritten bits from the last byte if necessary. */
+   if (end_ptr != NULL)
+      *end_ptr = (png_byte)((end_byte & end_mask) | (*end_ptr & ~end_mask));
 }

 #ifdef PNG_READ_INTERLACING_SUPPORTED
@@ -3374,7 +3428,7 @@ png_do_read_interlace(png_row_infop row_info, png_bytep row, int pass,

            for (i = 0; i < row_info->width; i++)
            {
-               png_byte v = (png_byte)((*sp >> sshift) & 0xf);
+               png_byte v = (png_byte)((*sp >> sshift) & 0x0f);
               int j;

               for (j = 0; j < jstop; j++)
@@ -3444,132 +3498,212 @@ png_do_read_interlace(png_row_infop row_info, png_bytep row, int pass,
 }
 #endif /* PNG_READ_INTERLACING_SUPPORTED */

-/* 1.5.6: Changed to just take a png_row_info (not png_ptr) and to ignore bad
- * adaptive filter bytes.
- */
-void /* PRIVATE */
-png_read_filter_row(png_row_infop row_info, png_bytep row,
-   png_const_bytep prev_row, int filter)
+static void
+png_read_filter_row_sub(png_row_infop row_info, png_bytep row,
+   png_const_bytep prev_row)
 {
-   switch (filter)
+   png_size_t i;
+   png_size_t istop = row_info->rowbytes;
+   unsigned int bpp = (row_info->pixel_depth + 7) >> 3;
+   png_bytep rp = row + bpp;
+   png_bytep lp = row;
+
+   PNG_UNUSED(prev_row)
+
+   for (i = bpp; i < istop; i++)
   {
-      case PNG_FILTER_VALUE_NONE:
-         break;
+      *rp = (png_byte)(((int)(*rp) + (int)(*lp++)) & 0xff);
+      rp++;
+   }
+}

-      case PNG_FILTER_VALUE_SUB:
-      {
-         png_size_t i;
-         png_size_t istop = row_info->rowbytes;
-         unsigned int bpp = (row_info->pixel_depth + 7) >> 3;
-         png_bytep rp = row + bpp;
-         png_bytep lp = row;
+static void
+png_read_filter_row_up(png_row_infop row_info, png_bytep row,
+   png_const_bytep prev_row)
+{
+   png_size_t i;
+   png_size_t istop = row_info->rowbytes;
+   png_bytep rp = row;
+   png_const_bytep pp = prev_row;

-         for (i = bpp; i < istop; i++)
-         {
-            *rp = (png_byte)(((int)(*rp) + (int)(*lp++)) & 0xff);
-            rp++;
-         }
-         break;
-      }
-      case PNG_FILTER_VALUE_UP:
-      {
-         png_size_t i;
-         png_size_t istop = row_info->rowbytes;
-         png_bytep rp = row;
-         png_const_bytep pp = prev_row;
+   for (i = 0; i < istop; i++)
+   {
+      *rp = (png_byte)(((int)(*rp) + (int)(*pp++)) & 0xff);
+      rp++;
+   }
+}

-         for (i = 0; i < istop; i++)
-         {
-            *rp = (png_byte)(((int)(*rp) + (int)(*pp++)) & 0xff);
-            rp++;
-         }
-         break;
-      }
-      case PNG_FILTER_VALUE_AVG:
-      {
-         png_size_t i;
-         png_bytep rp = row;
-         png_const_bytep pp = prev_row;
-         png_bytep lp = row;
-         unsigned int bpp = (row_info->pixel_depth + 7) >> 3;
-         png_size_t istop = row_info->rowbytes - bpp;
+static void
+png_read_filter_row_avg(png_row_infop row_info, png_bytep row,
+   png_const_bytep prev_row)
+{
+   png_size_t i;
+   png_bytep rp = row;
+   png_const_bytep pp = prev_row;
+   png_bytep lp = row;
+   unsigned int bpp = (row_info->pixel_depth + 7) >> 3;
+   png_size_t istop = row_info->rowbytes - bpp;

-         for (i = 0; i < bpp; i++)
-         {
-            *rp = (png_byte)(((int)(*rp) +
-                ((int)(*pp++) / 2 )) & 0xff);
+   for (i = 0; i < bpp; i++)
+   {
+      *rp = (png_byte)(((int)(*rp) +
+         ((int)(*pp++) / 2 )) & 0xff);

-            rp++;
-         }
+      rp++;
+   }

-         for (i = 0; i < istop; i++)
-         {
-            *rp = (png_byte)(((int)(*rp) +
-                (int)(*pp++ + *lp++) / 2 ) & 0xff);
+   for (i = 0; i < istop; i++)
+   {
+      *rp = (png_byte)(((int)(*rp) +
+         (int)(*pp++ + *lp++) / 2 ) & 0xff);

-            rp++;
-         }
-         break;
-      }
-      case PNG_FILTER_VALUE_PAETH:
-      {
-         png_size_t i;
-         png_bytep rp = row;
-         png_const_bytep pp = prev_row;
-         png_bytep lp = row;
-         png_const_bytep cp = prev_row;
-         unsigned int bpp = (row_info->pixel_depth + 7) >> 3;
-         png_size_t istop=row_info->rowbytes - bpp;
+      rp++;
+   }
+}

-         for (i = 0; i < bpp; i++)
-         {
-            *rp = (png_byte)(((int)(*rp) + (int)(*pp++)) & 0xff);
-            rp++;
-         }
+static void
+png_read_filter_row_paeth_1byte_pixel(png_row_infop row_info, png_bytep row,
+   png_const_bytep prev_row)
+{
+   png_bytep rp_end = row + row_info->rowbytes;
+   int a, c;

-         for (i = 0; i < istop; i++)   /* Use leftover rp,pp */
-         {
-            int a, b, c, pa, pb, pc, p;
+   /* First pixel/byte */
+   c = *prev_row++;
+   a = *row + c;
+   *row++ = (png_byte)a;

-            a = *lp++;
-            b = *pp++;
-            c = *cp++;
+   /* Remainder */
+   while (row < rp_end)
+   {
+      int b, pa, pb, pc, p;

-            p = b - c;
-            pc = a - c;
+      a &= 0xff; /* From previous iteration or start */
+      b = *prev_row++;

-#ifdef PNG_USE_ABS
-            pa = abs(p);
-            pb = abs(pc);
-            pc = abs(p + pc);
-#else
-            pa = p < 0 ? -p : p;
-            pb = pc < 0 ? -pc : pc;
-            pc = (p + pc) < 0 ? -(p + pc) : p + pc;
+      p = b - c;
+      pc = a - c;
+
+#     ifdef PNG_USE_ABS
+         pa = abs(p);
+         pb = abs(pc);
+         pc = abs(p + pc);
+#     else
+         pa = p < 0 ? -p : p;
+         pb = pc < 0 ? -pc : pc;
+         pc = (p + pc) < 0 ? -(p + pc) : p + pc;
+#     endif
+
+      /* Find the best predictor, the least of pa, pb, pc favoring the earlier
+       * ones in the case of a tie.
+       */
+      if (pb < pa) pa = pb, a = b;
+      if (pc < pa) a = c;
+
+      /* Calculate the current pixel in a, and move the previous row pixel to c
+       * for the next time round the loop
+       */
+      c = b;
+      a += *row;
+      *row++ = (png_byte)a;
+   }
+}
+
+static void
+png_read_filter_row_paeth_multibyte_pixel(png_row_infop row_info, png_bytep row,
+   png_const_bytep prev_row)
+{
+   int bpp = (row_info->pixel_depth + 7) >> 3;
+   png_bytep rp_end = row + bpp;
+
+   /* Process the first pixel in the row completely (this is the same as 'up'
+    * because there is only one candidate predictor for the first row).
+    */
+   while (row < rp_end)
+   {
+      int a = *row + *prev_row++;
+      *row++ = (png_byte)a;
+   }
+
+   /* Remainder */
+   rp_end += row_info->rowbytes - bpp;
+
+   while (row < rp_end)
+   {
+      int a, b, c, pa, pb, pc, p;
+
+      c = *(prev_row - bpp);
+      a = *(row - bpp);
+      b = *prev_row++;
+
+      p = b - c;
+      pc = a - c;
+
+#     ifdef PNG_USE_ABS
+         pa = abs(p);
+         pb = abs(pc);
+         pc = abs(p + pc);
+#     else
+         pa = p < 0 ? -p : p;
+         pb = pc < 0 ? -pc : pc;
+         pc = (p + pc) < 0 ? -(p + pc) : p + pc;
+#     endif
+
+      if (pb < pa) pa = pb, a = b;
+      if (pc < pa) a = c;
+
+      c = b;
+      a += *row;
+      *row++ = (png_byte)a;
+   }
+}
+
+#ifdef PNG_ARM_NEON
+static void
+png_init_filter_functions_neon(png_structp pp, unsigned int bpp)
+{
+   pp->read_filter[PNG_FILTER_VALUE_UP-1] = png_read_filter_row_up_neon;
+
+   if (bpp == 3) {
+      pp->read_filter[PNG_FILTER_VALUE_SUB-1] = png_read_filter_row_sub3_neon;
+      pp->read_filter[PNG_FILTER_VALUE_AVG-1] = png_read_filter_row_avg3_neon;
+      pp->read_filter[PNG_FILTER_VALUE_PAETH-1] = png_read_filter_row_paeth3_neon;
+   } else if (bpp == 4) {
+      pp->read_filter[PNG_FILTER_VALUE_SUB-1] = png_read_filter_row_sub4_neon;
+      pp->read_filter[PNG_FILTER_VALUE_AVG-1] = png_read_filter_row_avg4_neon;
+      pp->read_filter[PNG_FILTER_VALUE_PAETH-1] = png_read_filter_row_paeth4_neon;
+   }
+}
 #endif

-            /*
-               if (pa <= pb && pa <= pc)
-                  p = a;
+static void
+png_init_filter_functions(png_structp pp)
+{
+   unsigned int bpp = (pp->pixel_depth + 7) >> 3;

-               else if (pb <= pc)
-                  p = b;
+   pp->read_filter[PNG_FILTER_VALUE_SUB-1] = png_read_filter_row_sub;
+   pp->read_filter[PNG_FILTER_VALUE_UP-1] = png_read_filter_row_up;
+   pp->read_filter[PNG_FILTER_VALUE_AVG-1] = png_read_filter_row_avg;
+   if (bpp == 1)
+      pp->read_filter[PNG_FILTER_VALUE_PAETH-1] =
+         png_read_filter_row_paeth_1byte_pixel;
+   else
+      pp->read_filter[PNG_FILTER_VALUE_PAETH-1] =
+         png_read_filter_row_paeth_multibyte_pixel;

-               else
-                  p = c;
-             */
+#ifdef PNG_ARM_NEON
+   png_init_filter_functions_neon(pp, bpp);
+#endif
+}

-            p = (pa <= pb && pa <= pc) ? a : (pb <= pc) ? b : c;
-
-            *rp = (png_byte)(((int)(*rp) + p) & 0xff);
-            rp++;
-         }
-         break;
-      }
-      default:
-         /* NOT REACHED */
-         break;
-   }
+void /* PRIVATE */
+png_read_filter_row(png_structp pp, png_row_infop row_info, png_bytep row,
+   png_const_bytep prev_row, int filter)
+{
+   if (pp->read_filter[0] == NULL)
+      png_init_filter_functions(pp);
+   if (filter > PNG_FILTER_VALUE_NONE && filter < PNG_FILTER_VALUE_LAST)
+      pp->read_filter[filter-1](row_info, row, prev_row);
 }

 #ifdef PNG_SEQUENTIAL_READ_SUPPORTED
@@ -3913,35 +4047,39 @@ defined(PNG_USER_TRANSFORM_PTR_SUPPORTED)
   if (row_bytes + 48 > png_ptr->old_big_row_buf_size)
   {
     png_free(png_ptr, png_ptr->big_row_buf);
+     png_free(png_ptr, png_ptr->big_prev_row);

     if (png_ptr->interlaced)
        png_ptr->big_row_buf = (png_bytep)png_calloc(png_ptr,
            row_bytes + 48);

     else
-        png_ptr->big_row_buf = (png_bytep)png_malloc(png_ptr,
-            row_bytes + 48);
+        png_ptr->big_row_buf = (png_bytep)png_malloc(png_ptr, row_bytes + 48);

-     png_ptr->old_big_row_buf_size = row_bytes + 48;
+     png_ptr->big_prev_row = (png_bytep)png_malloc(png_ptr, row_bytes + 48);

 #ifdef PNG_ALIGNED_MEMORY_SUPPORTED
     /* Use 16-byte aligned memory for row_buf with at least 16 bytes
-      * of padding before and after row_buf.
+      * of padding before and after row_buf; treat prev_row similarly.
      * NOTE: the alignment is to the start of the pixels, one beyond the start
      * of the buffer, because of the filter byte.  Prior to libpng 1.5.6 this
-      * was incorrect, the filter byte was aligned, which had the exact opposite
-      * effect to that intended.
+      * was incorrect; the filter byte was aligned, which had the exact
+      * opposite effect of that intended.
      */
     {
        png_bytep temp = png_ptr->big_row_buf + 32;
-        int extra = (int)((temp - (png_bytep)0) & 0xf);
+        int extra = (int)((temp - (png_bytep)0) & 0x0f);
        png_ptr->row_buf = temp - extra - 1/*filter byte*/;
+
+        temp = png_ptr->big_prev_row + 32;
+        extra = (int)((temp - (png_bytep)0) & 0x0f);
+        png_ptr->prev_row = temp - extra - 1/*filter byte*/;
     }

-     png_ptr->old_big_row_buf_size = row_bytes + 48;
 #else
     /* Use 31 bytes of padding before and 17 bytes after row_buf. */
     png_ptr->row_buf = png_ptr->big_row_buf + 31;
+     png_ptr->prev_row = png_ptr->big_prev_row + 31;
 #endif
     png_ptr->old_big_row_buf_size = row_bytes + 48;
   }
@@ -3954,15 +4092,6 @@ defined(PNG_USER_TRANSFORM_PTR_SUPPORTED)
   if (png_ptr->rowbytes > (PNG_SIZE_MAX - 1))
      png_error(png_ptr, "Row has too many bytes to allocate in memory");

-   if (png_ptr->rowbytes + 1 > png_ptr->old_prev_row_size)
-   {
-      png_free(png_ptr, png_ptr->prev_row);
-
-      png_ptr->prev_row = (png_bytep)png_malloc(png_ptr, png_ptr->rowbytes + 1);
-
-      png_ptr->old_prev_row_size = png_ptr->rowbytes + 1;
-   }
-
   png_memset(png_ptr->prev_row, 0, png_ptr->rowbytes + 1);

   png_debug1(3, "width = %u,", png_ptr->width);
--- a/pngset.c
+++ b/pngset.c
@@ -1,7 +1,7 @@

 /* pngset.c - storage of image information into info struct
 *
- * Last changed in libpng 1.5.6 [(PENDING RELEASE)]
+ * Last changed in libpng 1.5.6 [November 3, 2011]
 * Copyright (c) 1998-2011 Glenn Randers-Pehrson
 * (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger)
 * (Version 0.88 Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.)
--- a/pngstruct.h
+++ b/pngstruct.h
@@ -105,8 +105,12 @@ struct png_struct_def
   png_uint_32 iwidth;        /* width of current interlaced row in pixels */
   png_uint_32 row_number;    /* current row in interlace pass */
   png_uint_32 chunk_name;    /* PNG_CHUNK() id of current chunk */
-   png_bytep prev_row;        /* buffer to save previous (unfiltered) row */
-   png_bytep row_buf;         /* buffer to save current (unfiltered) row */
+   png_bytep prev_row;        /* buffer to save previous (unfiltered) row.
+                               * This is a pointer into big_prev_row
+                               */
+   png_bytep row_buf;         /* buffer to save current (unfiltered) row.
+                               * This is a pointer into big_row_buf
+                               */
   png_bytep sub_row;         /* buffer to save "sub" row when filtering */
   png_bytep up_row;          /* buffer to save "up" row when filtering */
   png_bytep avg_row;         /* buffer to save "avg" row when filtering */
@@ -157,19 +161,21 @@ struct png_struct_def
   png_uint_32 flush_rows;    /* number of rows written since last flush */
 #endif

-#if defined(PNG_READ_GAMMA_SUPPORTED) || defined(PNG_READ_BACKGROUND_SUPPORTED)
+#ifdef PNG_READ_GAMMA_SUPPORTED
   int gamma_shift;      /* number of "insignificant" bits in 16-bit gamma */
   png_fixed_point gamma;        /* file gamma value */
   png_fixed_point screen_gamma; /* screen gamma value (display_exponent) */
-#endif

-#if defined(PNG_READ_GAMMA_SUPPORTED) || defined(PNG_READ_BACKGROUND_SUPPORTED)
   png_bytep gamma_table;     /* gamma table for 8-bit depth files */
+   png_uint_16pp gamma_16_table; /* gamma table for 16-bit depth files */
+#if defined(PNG_READ_BACKGROUND_SUPPORTED) || \
+   defined(PNG_READ_ALPHA_MODE_SUPPORTED) || \
+   defined(PNG_READ_RGB_TO_GRAY_SUPPORTED)
   png_bytep gamma_from_1;    /* converts from 1.0 to screen */
   png_bytep gamma_to_1;      /* converts from file to 1.0 */
-   png_uint_16pp gamma_16_table; /* gamma table for 16-bit depth files */
   png_uint_16pp gamma_16_from_1; /* converts from 1.0 to screen */
   png_uint_16pp gamma_16_to_1; /* converts from file to 1.0 */
+#endif /* READ_BACKGROUND || READ_ALPHA_MODE || RGB_TO_GRAY */
 #endif

 #if defined(PNG_READ_GAMMA_SUPPORTED) || defined(PNG_sBIT_SUPPORTED)
@@ -334,9 +340,8 @@ struct png_struct_def
   png_unknown_chunk unknown_chunk;
 #endif

-/* New members added in libpng-1.2.26 */
+/* New member added in libpng-1.2.26 */
  png_size_t old_big_row_buf_size;
-  png_size_t old_prev_row_size;

 /* New member added in libpng-1.2.30 */
  png_charp chunkdata;  /* buffer for reading chunk data */
@@ -345,5 +350,11 @@ struct png_struct_def
 /* New member added in libpng-1.4.0 */
   png_uint_32 io_state;
 #endif
+
+/* New member added in libpng-1.5.6 */
+   png_bytep big_prev_row;
+
+   void (*read_filter[PNG_FILTER_VALUE_LAST-1])(png_row_infop row_info,
+      png_bytep row, png_const_bytep prev_row);
 };
 #endif /* PNGSTRUCT_H */
--- a/pngtest.c
+++ b/pngtest.c
@@ -1,7 +1,7 @@

 /* pngtest.c - a simple test program to test libpng
 *
- * Last changed in libpng 1.5.6 [(PENDING RELEASE)]
+ * Last changed in libpng 1.5.6 [November 3, 2011]
 * Copyright (c) 1998-2011 Glenn Randers-Pehrson
 * (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger)
 * (Version 0.88 Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.)
@@ -1813,4 +1813,4 @@ main(int argc, char *argv[])
 }

 /* Generate a compiler error if there is an old png.h in the search path. */
-typedef png_libpng_version_1_5_6beta05 Your_png_h_is_not_version_1_5_6beta05;
+typedef png_libpng_version_1_5_7beta01 Your_png_h_is_not_version_1_5_7beta01;
--- a/pngvalid.c
+++ b/pngvalid.c
@@ -1,7 +1,7 @@

 /* pngvalid.c - validate libpng by constructing then reading png files.
 *
- * Last changed in libpng 1.5.6 [(PENDING RELEASE)]
+ * Last changed in libpng 1.5.7 [(PENDING RELEASE)]
 * Copyright (c) 2011 Glenn Randers-Pehrson
 * Written by John Cunningham Bowler
 *
@@ -433,12 +433,35 @@ pixel_copy(png_bytep toBuffer, png_uint_32 toIndex,
      memmove(toBuffer+(toIndex>>3), fromBuffer+(fromIndex>>3), pixelSize>>3);
 }

+/* Copy a complete row of pixels, taking into account potential partial
+ * bytes at the end.
+ */
+static void
+row_copy(png_bytep toBuffer, png_const_bytep fromBuffer, unsigned int bitWidth)
+{
+   memcpy(toBuffer, fromBuffer, bitWidth >> 3);
+
+   if ((bitWidth & 7) != 0)
+   {
+      unsigned int mask;
+
+      toBuffer += bitWidth >> 3;
+      fromBuffer += bitWidth >> 3;
+      /* The remaining bits are in the top of the byte, the mask is the bits to
+       * retain.
+       */
+      mask = 0xff >> (bitWidth & 7);
+      *toBuffer = (png_byte)((*toBuffer & mask) | (*fromBuffer & ~mask));
+   }
+}
+
 /* Compare pixels - they are assumed to start at the first byte in the
 * given buffers.
 */
 static int
 pixel_cmp(png_const_bytep pa, png_const_bytep pb, png_uint_32 bit_width)
 {
+#if PNG_LIBPNG_VER < 10506
   if (memcmp(pa, pb, bit_width>>3) == 0)
   {
      png_uint_32 p;
@@ -459,6 +482,13 @@ pixel_cmp(png_const_bytep pa, png_const_bytep pb, png_uint_32 bit_width)

      if (p == 0) return 0;
   }
+#else
+   /* From libpng-1.5.6 the overwrite should be fixed, so compare the trailing
+    * bits too:
+    */
+   if (memcmp(pa, pb, (bit_width+7)>>3) == 0)
+      return 0;
+#endif

   /* Return the index of the changed byte. */
   {
@@ -908,11 +938,13 @@ store_ensure_image(png_store *ps, png_structp pp, int nImages, png_size_t cbRow,
   ps->cb_row = cbRow;
   ps->image_h = cRows;

-   /* For error checking, the whole buffer is set to '1' - this matches what
-    * happens with the 'size' test images on write and also matches the unused
-    * bits in the test rows.
+   /* For error checking, the whole buffer is set to 10110010 (0xb2 - 178).
+    * This deliberately doesn't match the bits in the size test image which are
+    * outside the image; these are set to 0xff (all 1).  To make the row
+    * comparison work in the 'size' test case the size rows are pre-initialized
+    * to the same value prior to calling 'standard_row'.
    */
-   memset(ps->image, 0xff, cb);
+   memset(ps->image, 178, cb);

   /* Then put in the marks. */
   while (--nImages >= 0)
@@ -1300,7 +1332,21 @@ store_malloc(png_structp pp, png_alloc_size_t cb)
   }

   else
-      store_pool_error(pool->store, pp, "out of memory");
+   {
+      /* NOTE: the PNG user malloc function cannot use the png_ptr it is passed
+       * other than to retrieve the allocation pointer!  libpng calls the
+       * store_malloc callback in two basic cases:
+       *
+       * 1) From png_malloc; png_malloc will do a png_error itself if NULL is
+       *    returned.
+       * 2) From png_struct or png_info structure creation; png_malloc is
+       *    to return so cleanup can be performed.
+       *
+       * To handle this store_malloc can log a message, but can't do anything
+       * else.
+       */
+      store_log(pool->store, pp, "out of memory", 1 /* is_error */);
+   }

   return new;
 }
@@ -1311,6 +1357,14 @@ store_free(png_structp pp, png_voidp memory)
   store_pool *pool = voidcast(store_pool*, png_get_mem_ptr(pp));
   store_memory *this = voidcast(store_memory*, memory), **test;

+   /* Because libpng calls store_free with a dummy png_struct when deleting
+    * png_struct or png_info via png_destroy_struct_2 it is necessary to check
+    * the passed in png_structp to ensure it is valid, and not pass it to
+    * png_error if it is not.
+    */
+   if (pp != pool->store->pread && pp != pool->store->pwrite)
+      pp = NULL;
+
   /* First check that this 'memory' really is valid memory - it must be in the
    * pool list.  If it is, use the shared memory_free function to free it.
    */
@@ -1715,6 +1769,11 @@ typedef struct png_modifier
   double                   error_indexed;

   /* Flags: */
+   /* Whether to call png_read_update_info, not png_read_start_image, and how
+    * many times to call it.
+    */
+   int                      use_update_info;
+
   /* Whether or not to interlace. */
   int                      interlace_type :9; /* int, but must store '1' */

@@ -1798,6 +1857,7 @@ modifier_init(png_modifier *pm)
   pm->error_gray_2 = pm->error_gray_4 = pm->error_gray_8 = 0;
   pm->error_gray_16 = pm->error_color_8 = pm->error_color_16 = 0;
   pm->error_indexed = 0;
+   pm->use_update_info = 0;
   pm->interlace_type = PNG_INTERLACE_NONE;
   pm->test_standard = 0;
   pm->test_size = 0;
@@ -3884,6 +3944,7 @@ typedef struct standard_display
   int         do_interlace;   /* Do interlacing internally */
   int         is_transparent; /* Transparency information was present. */
   int         speed;          /* Doing a speed test */
+   int         use_update_info;/* Call update_info, not start_image */
   struct
   {
      png_uint_16 red;
@@ -3897,7 +3958,7 @@ typedef struct standard_display

 static void
 standard_display_init(standard_display *dp, png_store* ps, png_uint_32 id,
-   int do_interlace)
+   int do_interlace, int use_update_info)
 {
   memset(dp, 0, sizeof *dp);

@@ -3921,6 +3982,7 @@ standard_display_init(standard_display *dp, png_store* ps, png_uint_32 id,
   dp->do_interlace = do_interlace;
   dp->is_transparent = 0;
   dp->speed = ps->speed;
+   dp->use_update_info = use_update_info;
   dp->npalette = 0;
   /* Preset the transparent color to black: */
   memset(&dp->transparent, 0, sizeof dp->transparent);
@@ -4278,7 +4340,16 @@ standard_info_imp(standard_display *dp, png_structp pp, png_infop pi,
   /* And the info callback has to call this (or png_read_update_info - see
    * below in the png_modifier code for that variant.
    */
-   png_start_read_image(pp);
+   if (dp->use_update_info)
+   {
+      /* For debugging the effect of multiple calls: */
+      int i = dp->use_update_info;
+      while (i-- > 0)
+         png_read_update_info(pp, pi);
+   }
+
+   else
+      png_start_read_image(pp);

   /* Validate the height, width and rowbytes plus ensure that sufficient buffer
    * exists for decoding the image.
@@ -4343,7 +4414,7 @@ progressive_row(png_structp pp, png_bytep new_row, png_uint_32 y, int pass)
         if (dp->interlace_type == PNG_INTERLACE_ADAM7)
            deinterlace_row(row, new_row, dp->pixel_size, dp->w, pass);
         else
-            memcpy(row, new_row, dp->cbRow);
+            row_copy(row, new_row, dp->pixel_size * dp->w);
      }
      else
         png_progressive_combine_row(pp, row, new_row);
@@ -4387,10 +4458,12 @@ sequential_row(standard_display *dp, png_structp pp, png_infop pi,

               /* The following aids (to some extent) error detection - we can
                * see where png_read_row wrote.  Use opposite values in row and
-                * display to make this easier.
+                * display to make this easier.  Don't use 0xff (which is used in
+                * the image write code to fill unused bits) or 0 (which is a
+                * likely value to overwrite unused bits with).
                */
-               memset(row, 0xff, sizeof row);
-               memset(display, 0, sizeof display);
+               memset(row, 0xc5, sizeof row);
+               memset(display, 0x5c, sizeof display);

               png_read_row(pp, row, display);

@@ -4423,39 +4496,51 @@ standard_row_validate(standard_display *dp, png_structp pp,
   int where;
   png_byte std[STANDARD_ROWMAX];

-   memset(std, 0xff, sizeof std);
+   /* The row must be pre-initialized to the magic number here for the size
+    * tests to pass:
+    */
+   memset(std, 178, sizeof std);
   standard_row(pp, std, dp->id, y);

   /* At the end both the 'row' and 'display' arrays should end up identical.
    * In earlier passes 'row' will be partially filled in, with only the pixels
    * that have been read so far, but 'display' will have those pixels
    * replicated to fill the unread pixels while reading an interlaced image.
+#if PNG_LIBPNG_VER < 10506
    * The side effect inside the libpng sequential reader is that the 'row'
    * array retains the correct values for unwritten pixels within the row
    * bytes, while the 'display' array gets bits off the end of the image (in
    * the last byte) trashed.  Unfortunately in the progressive reader the
    * row bytes are always trashed, so we always do a pixel_cmp here even though
    * a memcmp of all cbRow bytes will succeed for the sequential reader.
+#endif
    */
   if (iImage >= 0 &&
      (where = pixel_cmp(std, store_image_row(dp->ps, pp, iImage, y),
            dp->bit_width)) != 0)
   {
      char msg[64];
-      sprintf(msg, "PNG image row %d changed at byte %d", y, where-1);
+      sprintf(msg, "PNG image row[%d][%d] changed from %.2x to %.2x", y,
+         where-1, std[where-1],
+         store_image_row(dp->ps, pp, iImage, y)[where-1]);
      png_error(pp, msg);
   }

+#if PNG_LIBPNG_VER < 10506
   /* In this case use pixel_cmp because we need to compare a partial
    * byte at the end of the row if the row is not an exact multiple
-    * of 8 bits wide.
+    * of 8 bits wide.  (This is fixed in libpng-1.5.6 and pixel_cmp is
+    * changed to match!)
    */
+#endif
   if (iDisplay >= 0 &&
      (where = pixel_cmp(std, store_image_row(dp->ps, pp, iDisplay, y),
         dp->bit_width)) != 0)
   {
      char msg[64];
-      sprintf(msg, "display row %d changed at byte %d", y, where-1);
+      sprintf(msg, "display  row[%d][%d] changed from %.2x to %.2x", y,
+         where-1, std[where-1],
+         store_image_row(dp->ps, pp, iDisplay, y)[where-1]);
      png_error(pp, msg);
   }
 }
@@ -4496,7 +4581,7 @@ standard_end(png_structp pp, png_infop pi)
 /* A single test run checking the standard image to ensure it is not damaged. */
 static void
 standard_test(png_store* PNG_CONST psIn, png_uint_32 PNG_CONST id,
-   int do_interlace)
+   int do_interlace, int use_update_info)
 {
   standard_display d;
   context(psIn, fault);
@@ -4504,7 +4589,7 @@ standard_test(png_store* PNG_CONST psIn, png_uint_32 PNG_CONST id,
   /* Set up the display (stack frame) variables from the arguments to the
    * function and initialize the locals that are filled in later.
    */
-   standard_display_init(&d, psIn, id, do_interlace);
+   standard_display_init(&d, psIn, id, do_interlace, use_update_info);

   /* Everything is protected by a Try/Catch.  The functions called also
    * typically have local Try/Catch blocks.
@@ -4591,7 +4676,7 @@ test_standard(png_modifier* PNG_CONST pm, png_byte PNG_CONST colour_type,
           interlace_type < PNG_INTERLACE_LAST; ++interlace_type)
      {
         standard_test(&pm->this, FILEID(colour_type, DEPTH(bdlo), 0/*palette*/,
-            interlace_type, 0, 0, 0), 0/*do_interlace*/);
+            interlace_type, 0, 0, 0), 0/*do_interlace*/, pm->use_update_info);

         if (fail(pm))
            return 0;
@@ -4650,25 +4735,29 @@ test_size(png_modifier* PNG_CONST pm, png_byte PNG_CONST colour_type,
          * to validate.
          */
         standard_test(&pm->this, FILEID(colour_type, DEPTH(bdlo), 0/*palette*/,
-            PNG_INTERLACE_NONE, w, h, 0), 0/*do_interlace*/);
+            PNG_INTERLACE_NONE, w, h, 0), 0/*do_interlace*/,
+            pm->use_update_info);

         if (fail(pm))
            return 0;

         standard_test(&pm->this, FILEID(colour_type, DEPTH(bdlo), 0/*palette*/,
-            PNG_INTERLACE_NONE, w, h, 1), 0/*do_interlace*/);
+            PNG_INTERLACE_NONE, w, h, 1), 0/*do_interlace*/,
+            pm->use_update_info);

         if (fail(pm))
            return 0;

         standard_test(&pm->this, FILEID(colour_type, DEPTH(bdlo), 0/*palette*/,
-            PNG_INTERLACE_ADAM7, w, h, 0), 0/*do_interlace*/);
+            PNG_INTERLACE_ADAM7, w, h, 0), 0/*do_interlace*/,
+            pm->use_update_info);

         if (fail(pm))
            return 0;

         standard_test(&pm->this, FILEID(colour_type, DEPTH(bdlo), 0/*palette*/,
-            PNG_INTERLACE_ADAM7, w, h, 1), 0/*do_interlace*/);
+            PNG_INTERLACE_ADAM7, w, h, 1), 0/*do_interlace*/,
+            pm->use_update_info);

         if (fail(pm))
            return 0;
@@ -4678,13 +4767,15 @@ test_size(png_modifier* PNG_CONST pm, png_byte PNG_CONST colour_type,
          * to the code used in the non-interlaced case too.
          */
         standard_test(&pm->this, FILEID(colour_type, DEPTH(bdlo), 0/*palette*/,
-            PNG_INTERLACE_NONE, w, h, 0), 1/*do_interlace*/);
+            PNG_INTERLACE_NONE, w, h, 0), 1/*do_interlace*/,
+            pm->use_update_info);

         if (fail(pm))
            return 0;

         standard_test(&pm->this, FILEID(colour_type, DEPTH(bdlo), 0/*palette*/,
-            PNG_INTERLACE_ADAM7, w, h, 0), 1/*do_interlace*/);
+            PNG_INTERLACE_ADAM7, w, h, 0), 1/*do_interlace*/,
+            pm->use_update_info);

         if (fail(pm))
            return 0;
@@ -5159,7 +5250,8 @@ transform_display_init(transform_display *dp, png_modifier *pm, png_uint_32 id,
   memset(dp, 0, sizeof dp);

   /* Standard fields */
-   standard_display_init(&dp->this, &pm->this, id, 0/*do_interlace*/);
+   standard_display_init(&dp->this, &pm->this, id, 0/*do_interlace*/,
+      pm->use_update_info);

   /* Parameter fields */
   dp->pm = pm;
@@ -5180,7 +5272,13 @@ transform_info_imp(transform_display *dp, png_structp pp, png_infop pi)
   dp->transform_list->set(dp->transform_list, dp, pp, pi);

   /* Update the info structure for these transforms: */
-   png_read_update_info(pp, pi);
+   {
+      int i = dp->this.use_update_info;
+      /* Always do one call, even if use_update_info is 0. */
+      do
+         png_read_update_info(pp, pi);
+      while (--i > 0);
+   }

   /* And get the output information into the standard_display */
   standard_info_part2(&dp->this, pp, pi, 1/*images*/);
@@ -7012,7 +7110,8 @@ gamma_display_init(gamma_display *dp, png_modifier *pm, png_uint_32 id,
    double background_gamma)
 {
   /* Standard fields */
-   standard_display_init(&dp->this, &pm->this, id, 0/*do_interlace*/);
+   standard_display_init(&dp->this, &pm->this, id, 0/*do_interlace*/,
+      pm->use_update_info);

   /* Parameter fields */
   dp->pm = pm;
@@ -7141,7 +7240,13 @@ gamma_info_imp(gamma_display *dp, png_structp pp, png_infop pi)
      }
   }

-   png_read_update_info(pp, pi);
+   {
+      int i = dp->this.use_update_info;
+      /* Always do one call, even if use_update_info is 0. */
+      do
+         png_read_update_info(pp, pi);
+      while (--i > 0);
+   }

   /* Now we may get a different cbRow: */
   standard_info_part2(&dp->this, pp, pi, 1 /*images*/);
@@ -7748,7 +7853,7 @@ gamma_component_validate(PNG_CONST char *name, PNG_CONST validate_info *vi,
               case ALPHA_MODE_OFFSET + PNG_ALPHA_BROKEN:
               case ALPHA_MODE_OFFSET + PNG_ALPHA_OPTIMIZED:
 #           endif /* ALPHA_MODE_SUPPORTED */
-               do_compose = (alpha >= 0 && alpha < 1);
+               do_compose = (alpha > 0 && alpha < 1);
               use_input = (alpha != 0);
               break;

@@ -9372,6 +9477,9 @@ int main(int argc, PNG_CONST char **argv)
      else if (strcmp(*argv, "--progressive-read") == 0)
         pm.this.progressive = 1;

+      else if (strcmp(*argv, "--use-update-info") == 0)
+         ++pm.use_update_info; /* Can call multiple times */
+
      else if (strcmp(*argv, "--interlace") == 0)
         pm.interlace_type = PNG_INTERLACE_ADAM7;

--- a/pngwrite.c
+++ b/pngwrite.c
@@ -1,7 +1,7 @@

 /* pngwrite.c - general routines to write a PNG file
 *
- * Last changed in libpng 1.5.6 [(PENDING RELEASE)]
+ * Last changed in libpng 1.5.6 [November 3, 2011]
 * Copyright (c) 1998-2011 Glenn Randers-Pehrson
 * (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger)
 * (Version 0.88 Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.)
--- a/pngwtran.c
+++ b/pngwtran.c
@@ -1,7 +1,7 @@

 /* pngwtran.c - transforms the data in a row for PNG writers
 *
- * Last changed in libpng 1.5.6 [(PENDING RELEASE)]
+ * Last changed in libpng 1.5.6 [November 3, 2011]
 * Copyright (c) 1998-2011 Glenn Randers-Pehrson
 * (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger)
 * (Version 0.88 Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.)
--- a/pngwutil.c
+++ b/pngwutil.c
@@ -1,7 +1,7 @@

 /* pngwutil.c - utilities to write a PNG file
 *
- * Last changed in libpng 1.5.6 [(PENDING RELEASE)]
+ * Last changed in libpng 1.5.6 [November 3, 2011]
 * Copyright (c) 1998-2011 Glenn Randers-Pehrson
 * (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger)
 * (Version 0.88 Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.)
@@ -582,7 +582,10 @@ png_write_compressed_data_out(png_structp png_ptr, compression_state *comp)
   }

 #ifdef PNG_WRITE_OPTIMIZE_CMF_SUPPORTED
-   if (comp->input_len >= 2 && comp->input_len < 16384)
+   /* The zbuf_size test is because the code below doesn't work if zbuf_size is
+    * '1'; simply skip it to avoid memory overwrite.
+    */
+   if (comp->input_len >= 2 && comp->input_len < 16384 && png_ptr->zbuf_size > 1)
   {
      unsigned int z_cmf;  /* zlib compression method and flags */

--- a/projects/vstudio/readme.txt
+++ b/projects/vstudio/readme.txt
@@ -1,7 +1,7 @@

 VisualStudio instructions

-libpng version 1.5.6beta05 - October 12, 2011
+libpng version 1.5.7beta01 - November 4, 2011

 Copyright (c) 1998-2010 Glenn Randers-Pehrson

--- a/projects/vstudio/zlib.props
+++ b/projects/vstudio/zlib.props
@@ -2,7 +2,7 @@
 <!--
 * zlib.props - location of zlib source
 *
- * libpng version 1.5.6beta05 - October 12, 2011
+ * libpng version 1.5.7beta01 - November 4, 2011
 *
 * Copyright (c) 1998-2011 Glenn Randers-Pehrson
 *
--- a/scripts/README.txt
+++ b/scripts/README.txt
@@ -1,9 +1,9 @@

-Makefiles for  libpng version 1.5.6beta05 - October 12, 2011
+Makefiles for  libpng version 1.5.7beta01 - November 4, 2011

 pnglibconf.h.prebuilt       =>  Stores configuration settings
 makefile.linux    =>  Linux/ELF makefile
-                       (gcc, creates libpng15.so.15.1.5.6beta05)
+                       (gcc, creates libpng15.so.15.1.5.7beta01)
 makefile.gcc      =>  Generic makefile (gcc, creates static libpng.a)
 makefile.knr      =>  Archaic UNIX Makefile that converts files with
                       ansi2knr (Requires ansi2knr.c from
@@ -20,7 +20,7 @@ pnglibconf.h.prebuilt       =>  Stores configuration settings
 makefile.dec      =>  DEC Alpha UNIX makefile
 makefile.dj2      =>  DJGPP 2 makefile
 makefile.elf      =>  Linux/ELF makefile symbol versioning,
-                       (gcc, creates libpng15.so.15.1.5.6beta05)
+                       (gcc, creates libpng15.so.15.1.5.7beta01)
 makefile.freebsd  =>  FreeBSD makefile
 makefile.gcc      =>  Generic gcc makefile
 makefile.hpgcc    =>  HPUX makefile using gcc
@@ -35,12 +35,12 @@ pnglibconf.h.prebuilt       =>  Stores configuration settings
 makefile.os2      =>  OS/2 Makefile (gcc and emx, requires libpng.def)
 makefile.sco      =>  For SCO OSr5  ELF and Unixware 7 with Native cc
 makefile.sggcc    =>  Silicon Graphics (gcc,
-                       creates libpng15.so.15.1.5.6beta05)
+                       creates libpng15.so.15.1.5.7beta01)
 makefile.sgi      =>  Silicon Graphics IRIX makefile (cc, creates static lib)
 makefile.solaris  =>  Solaris 2.X makefile (gcc,
-                       creates libpng15.so.15.1.5.6beta05)
+                       creates libpng15.so.15.1.5.7beta01)
 makefile.so9      =>  Solaris 9 makefile (gcc,
-                       creates libpng15.so.15.1.5.6beta05)
+                       creates libpng15.so.15.1.5.7beta01)
 makefile.std      =>  Generic UNIX makefile (cc, creates static libpng.a)
 makefile.sunos    =>  Sun makefile
 makefile.32sunu   =>  Sun Ultra 32-bit makefile
--- a/scripts/def.dfn
+++ b/scripts/def.dfn
@@ -27,12 +27,12 @@ S--E
 S-EXPORTS-E
 S-;Version 1.5.0beta58-E

-/* NOTE: @@@ is interpreted by the calling script as a signal to
+/* NOTE: PNG_JOIN is interpreted by the calling script as a signal to
 * join the two things on either side, so we can do symbol
 * substitution within the name, regular C ## joins the pp-tokens,
 * not their final values.
 */
 #define PNG_EXPORTA(ordinal, type, name, args, attributes)\
-	PNG_DEFN_MAGIC- SYMBOL_PREFIX @@@ name-PNG_DEFN_END
+	PNG_DEFN_MAGIC- SYMBOL_PREFIX PNG_JOIN name-PNG_DEFN_END

 #include "../png.h"
--- a/scripts/libpng-config-head.in
+++ b/scripts/libpng-config-head.in
@@ -11,7 +11,7 @@

 # Modeled after libxml-config.

-version=1.5.6beta05
+version=1.5.7beta01
 prefix=""
 libdir=""
 libs=""
--- a/scripts/libpng.pc.in
+++ b/scripts/libpng.pc.in
@@ -5,6 +5,6 @@ includedir=@includedir@/libpng15

 Name: libpng
 Description: Loads and saves PNG files
-Version: 1.5.6beta05
+Version: 1.5.7beta01
 Libs: -L${libdir} -lpng15
 Cflags: -I${includedir}
--- a/scripts/makefile.cegcc
+++ b/scripts/makefile.cegcc
@@ -23,7 +23,7 @@

 VERMAJ = 1
 VERMIN = 5
-VERMIC = 6
+VERMIC = 7
 VER = $(VERMAJ).$(VERMIN).$(VERMIC)
 NAME = libpng
 PACKAGE = $(NAME)-$(VER)
--- a/scripts/makefile.linux
+++ b/scripts/makefile.linux
@@ -10,7 +10,7 @@
 # Library name:
 LIBNAME = libpng15
 PNGMAJ = 15
-RELEASE = 6
+RELEASE = 7

 # Shared library names:
 LIBSO=$(LIBNAME).so
--- a/scripts/makefile.ne12bsd
+++ b/scripts/makefile.ne12bsd
@@ -17,7 +17,7 @@ INCSDIR=${LOCALBASE}/include/libpng15

 LIB=	png15
 SHLIB_MAJOR=	0
-SHLIB_MINOR=	1.5.6beta05
+SHLIB_MINOR=	1.5.7beta01
 SRCS=	png.c pngset.c pngget.c pngrutil.c pngtrans.c pngwutil.c \
 	pngread.c pngrio.c pngwio.c pngwrite.c pngrtran.c \
 	pngwtran.c pngmem.c pngerror.c pngpread.c
--- a/scripts/makefile.netbsd
+++ b/scripts/makefile.netbsd
@@ -17,7 +17,7 @@ INCSDIR=${LOCALBASE}/include

 LIB=	png
 SHLIB_MAJOR=	15
-SHLIB_MINOR=	1.5.6beta05
+SHLIB_MINOR=	1.5.7beta01
 SRCS=	png.c pngset.c pngget.c pngrutil.c pngtrans.c pngwutil.c \
 	pngread.c pngrio.c pngwio.c pngwrite.c pngrtran.c \
 	pngwtran.c pngmem.c pngerror.c pngpread.c
--- a/scripts/makefile.openbsd
+++ b/scripts/makefile.openbsd
@@ -11,7 +11,7 @@ LIBDIR=	${PREFIX}/lib
 MANDIR= ${PREFIX}/man/cat

 SHLIB_MAJOR=	15
-SHLIB_MINOR=	1.5.6beta05
+SHLIB_MINOR=	1.5.7beta01

 LIB=	png
 SRCS=	png.c pngerror.c pngget.c pngmem.c pngpread.c \
--- a/scripts/options.awk
+++ b/scripts/options.awk
@@ -35,13 +35,14 @@ BEGIN{
   err=0                        # in-line exit sets this
   start="PNG_DEFN_MAGIC-"      # Arbitrary start
   end="-PNG_DEFN_END"          # Arbitrary end
-   cx= "/@@@*"                  # Open C comment for output file
+   ct="PNG_JOIN"                # Join two tokens
+   cx= "/" ct "*"               # Open C comment for output file
   comment=start cx             # Comment start
   cend="*/" end                # Comment end
-   def=start "#define PNG_@@@"  # Arbitrary define
-   sup="@@@_SUPPORTED" end      # end supported option
-   und=comment "#undef PNG_@@@" # Unsupported option
-   une="@@@_SUPPORTED" cend     # end unsupported option
+   def=start "#define PNG_" ct  # Arbitrary define
+   sup=ct "_SUPPORTED" end      # end supported option
+   und=comment "#undef PNG_" ct # Unsupported option
+   une=ct "_SUPPORTED" cend     # end unsupported option
   error=start "ERROR:"         # error message

   # Variables
--- a/scripts/sym.dfn
+++ b/scripts/sym.dfn
@@ -10,6 +10,6 @@
 */

 #define PNG_EXPORTA(ordinal, type, name, args, attributes)\
-	PNG_DEFN_MAGIC-SYMBOL_PREFIX @@@ name-PNG_DEFN_END
+	PNG_DEFN_MAGIC-SYMBOL_PREFIX PNG_JOIN name-PNG_DEFN_END

 #include "../png.h"
--- a/scripts/symbols.def
+++ b/scripts/symbols.def
@@ -5,7 +5,7 @@
 LIBRARY

 EXPORTS
-;Version 1.5.6beta05
+;Version 1.5.7beta01
 png_access_version_number @1
 png_set_sig_bytes @2
 png_sig_cmp @3
--- a/scripts/vers.dfn
+++ b/scripts/vers.dfn
@@ -11,13 +11,13 @@

 #define HEADER PNG_DEFN_MAGIC-PNGLIB_LIBNAME {global:-PNG_DEFN_END

-/* NOTE: @@@ is interpreted by the calling script as a signal to
+/* NOTE: PNG_JOIN is interpreted by the calling script as a signal to
 * join the two things on either side, so we can do symbol
 * substitution within the name, regular C ## joins the pp-tokens,
 * not their final values.
 */
 #define PNG_EXPORTA(ordinal, type, name, args, attributes)\
-	PNG_DEFN_MAGIC- SYMBOL_PREFIX @@@ name;-PNG_DEFN_END
+	PNG_DEFN_MAGIC- SYMBOL_PREFIX PNG_JOIN name;-PNG_DEFN_END

 #define TRAILER PNG_DEFN_MAGIC-local: *; };-PNG_DEFN_END

--- a/test-pngvalid-full.sh
+++ b/test-pngvalid-full.sh
@@ -9,11 +9,11 @@ echo "============ pngvalid-full.sh ==============" >> pngtest-log.txt
 echo "Running test-pngvalid-full.sh"
 for gamma in threshold transform sbit 16-to-8 background alpha-mode "transform --expand16" "background --expand16" "alpha-mode --expand16"
 do
-   if ./pngvalid --gamma-$gamma >> pngtest-log.txt 2>&1
+   if ./pngvalid "$@" --gamma-$gamma >> pngtest-log.txt 2>&1
   then
-      echo "  PASS:" pngvalid "--gamma-$gamma"
+      echo "  PASS: pngvalid" "$@" "--gamma-$gamma"
   else
-      echo "  FAIL:" pngvalid "--gamma-$gamma"
+      echo "  FAIL: pngvalid" "$@" "--gamma-$gamma"
      err=1
   fi
 done
--- a/test-pngvalid-simple.sh
+++ b/test-pngvalid-simple.sh
@@ -18,11 +18,11 @@ for opts in "--standard" "--standard --progressive-read" \
   "--size" "--size --progressive-read" \
   "--transform"
 do
-   if ./pngvalid  $opts >> pngtest-log.txt 2>&1
+   if ./pngvalid "$@" $opts >> pngtest-log.txt 2>&1
   then
-      echo "  PASS:" pngvalid $opts
+      echo "  PASS: pngvalid" "$@" $opts
   else
-      echo "  FAIL:" pngvalid $opts
+      echo "  FAIL: pngvalid" "$@" $opts
      err=1
   fi
 done
Author	SHA1	Message	Date
Glenn Randers-Pehrson	55e85c24b4	[libpng15] Imported from libpng-1.5.7beta01.tar	2011-11-04 13:47:49 -05:00
John Bowler	fcc0263191	[libpng15] Paeth filter speed improvements from work by Siarhei Siamashka. This changes the 'Paeth' reconstruction function to improve the GCC code generation on x86. The changes are only part of the suggested ones; just the changes that definitely improve speed and remain simple. The changes also slightly increase the clarity of the code. In a	2011-11-03 18:31:00 -05:00
John Bowler	1d8b75550f	[libpng15] Fix for the preprocessor of the Intel C compiler. The preprocessor adjacent @ signs with a space; this changes the concatentation from @@@ to PNG_JOIN; that should work with all compiler preprocessors.	2011-11-03 18:19:53 -05:00
John Bowler	aff44028ba	[libpng15] Fixed bug in pngvalid on early allocation failure; fixed type cast in pngmem.c; pngvalid would attempt to call png_error() if the allocation of a png_struct or png_info failed. This would probably have led to a crash. The pngmem.c implementation of png_malloc() included a cast to png_size_t which would fail on large allocations on 16-bit systems.	2011-11-03 16:11:08 -05:00
Glenn Randers-Pehrson	6d7705eedf	[libpng15] Bump version to libpng-1.5.7beta01	2011-11-03 00:49:07 -05:00
Mans Rullgard	d3a94802d8	[libpng15] Added support for ARM processor (Mans Rullgard)	2011-11-03 00:47:55 -05:00
Glenn Randers-Pehrson	2b7d730e27	[libpng15] Bump version to libpng-1.5.7beta01	2011-11-02 23:14:13 -05:00
Glenn Randers-Pehrson	bc6726bc04	[libpng15] Imported from libpng-1.5.6.tar	2011-11-02 22:48:36 -05:00
Glenn Randers-Pehrson	1876366b17	[libpng15] Fixed a spelling error.	2011-10-27 22:09:22 -05:00
Glenn Randers-Pehrson	c94b996af8	[libpng15] Bump version to libpng-1.5.6rc04	2011-10-27 21:09:08 -05:00
Glenn Randers-Pehrson	0e9f8ced1e	[libpng15] Imported from libpng-1.5.6rc03.tar	2011-10-27 21:03:00 -05:00
Glenn Randers-Pehrson	7342fcaf92	[libpng] #define PNG_ALIGN_TYPE PNG_ALIGN_NONE in contrib/pngminim/*/pngusr.h	2011-10-27 19:56:36 -05:00
John Bowler	92ef313c77	[libpng15] Fixed compiler warnings with Intel and MSYS compilers. The logical shift fix for Microsoft Visual C is required by other compilers, so this enables that fix for all compilers when using compile-time constants. Under MSYS 'byte' is a name declared in a system header file, so we changed the name of a local variable to avoid the warnings that result.	2011-10-27 19:53:14 -05:00
Glenn Randers-Pehrson	cb75699dff	[libpng15] Renamed the LSR() macro to PNG_LSR() and added PNG_LSL() macro.	2011-10-27 16:59:03 -05:00
Glenn Randers-Pehrson	122a525c83	[libpng15] Bump version to libpng-1.5.6rc03	2011-10-27 16:51:52 -05:00
Glenn Randers-Pehrson	5e823c1fd5	[libpng15] Imported from libpng-1.5.6rc02.tar	2011-10-27 16:19:17 -05:00
Glenn Randers-Pehrson	8db19980fa	[libpng15] Add leading zero to some 1-digit hex constants (0xf -> 0x0f).	2011-10-27 16:17:24 -05:00
Glenn Randers-Pehrson	ef02d563a3	[libpng15] Added LSR() macro to defend against buggy compilers that evaluate non-taken code branches and complain about out-of-range shifts.	2011-10-27 12:05:58 -05:00
Glenn Randers-Pehrson	b2068640d1	[libpng15] Bump version to libpng-1.5.6rc02	2011-10-26 08:48:35 -05:00
Glenn Randers-Pehrson	93254f66fc	[libpng15] Imported from libpng-1.5.6rc01.tar	2011-10-26 08:48:23 -05:00
Glenn Randers-Pehrson	52093f1776	[libpng15] Corrected recent ANNOUNCE and CHANGES entry	2011-10-21 12:57:01 -05:00
Glenn Randers-Pehrson	0654d63196	[libpng15] Bump version to libpng-1.5.6beta08	2011-10-21 07:39:45 -05:00
Glenn Randers-Pehrson	4e8aa822dc	[libpng15] Imported from libpng-1.5.6beta07.tar	2011-10-21 07:39:34 -05:00
Mans Rullgard	1c42276a39	[libpng15] New png_struct member png_ptr->old_prev_row	2011-10-17 16:52:19 -05:00
Mans Rullgard	c9e27d026d	[libpng15] Made png_ptr->prev_row an aligned pointer into png_ptr->big_prev_row and removed a redundant assignment (Mans Rullgard).	2011-10-17 15:25:03 -05:00
Glenn Randers-Pehrson	e7db181e5d	[libpng15] Bump version to libpng-1.5.6beta07	2011-10-17 08:08:16 -05:00
Glenn Randers-Pehrson	f5c5e53bf5	[libpng15] Imported from libpng-1.5.6beta06.tar	2011-10-17 08:08:08 -05:00
John Bowler	ecb3ad035a	[libpng15] Updated ANNOUNCE and CHANGES	2011-10-16 22:55:44 -05:00
John Bowler	fb5b3ac013	[libpng15] Prevent libpng overwriting unused bits at the end of the image when is not byte aligned, while reading. Prior to libpng-1.5.6 libpng would overwrite the end of the image if the row width is not an exact multiple of 8 bits and the image is not interlaced.	2011-10-16 22:52:56 -05:00
John Bowler	5b84901c55	[libpng15] Turned on multiple png_read_update_info in pngvalid transform tests.	2011-10-16 22:42:46 -05:00
John Bowler	57cbcf6b8f	[libpng15] Add ability to call png_read_update_info multiple times to pngvalid.c	2011-10-14 19:43:53 -05:00
John Bowler	07772cba07	[libpng15] Fixes for multiple calls to png_read_update_info. These fixes attend to most of the errors revealed in pngvalid, however doing the gamma work twice results in inaccuracies that can't be easily fixed. There is now a warning in the code if this is going to happen.	2011-10-14 18:19:47 -05:00
John Bowler	5c1905caae	[libpng15] Fixed a relatively harmless memory overwrite in compressed text writing	2011-10-14 12:33:52 -05:00
Glenn Randers-Pehrson	d58251b47e	[libpng15] Reverted previous change; removed png_get_compression_buffer() API. It is too risky. Exactly how png_ptr->zbuf is used is under control of the individual chunk implementation and there could easily be significant changes within a major release.	2011-10-13 20:30:02 -05:00
Glenn Randers-Pehrson	d3dcb463d6	[libpng15] Added png_get_compression_buffer() API.	2011-10-13 17:51:31 -05:00
Glenn Randers-Pehrson	3dbfd300ff	[libpng15] Removed two redundant tests for unitialized row.	2011-10-13 17:24:36 -05:00
Glenn Randers-Pehrson	ff36991ca2	[libpng15] Bump version to libpng-1.5.6beta06	2011-10-12 06:54:55 -05:00