[devel] Imported from libpng-1.5.1beta11.tar

[devel] Fixed comments around PNG_UNUSED macro definition in pngpriv.h
[devel] Updated CHANGES and ANNOUNCE.
2025-07-10 18:04:09 +02:00 · 2011-01-28 15:16:05 -06:00 · 2011-01-28 15:14:43 -06:00 · 2011-01-28 07:05:53 -06:00 · 2011-01-28 06:38:14 -06:00 · 2011-01-28 06:34:02 -06:00
60 changed files with 3511 additions and 1631 deletions
--- a/69
+++ b/69
@@ -1,5 +1,5 @@

-Libpng 1.5.1beta06 - January 20, 2011
+Libpng 1.5.1beta11 - January 28, 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.
@@ -9,20 +9,20 @@ Files available for download:
 Source files with LF line endings (for Unix/Linux) and with a
 "configure" script

-   1.5.1beta06.tar.xz (LZMA-compressed, recommended)
-   1.5.1beta06.tar.gz
-   1.5.1beta06.tar.bz2
+   1.5.1beta11.tar.xz (LZMA-compressed, recommended)
+   1.5.1beta11.tar.gz
+   1.5.1beta11.tar.bz2

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

-   lp151b06.7z  (LZMA-compressed, recommended)
-   lp151b06.zip
+   lp151b11.7z  (LZMA-compressed, recommended)
+   lp151b11.zip

 Other information:

-   1.5.1beta06-README.txt
-   1.5.1beta06-LICENSE.txt
+   1.5.1beta11-README.txt
+   1.5.1beta11-LICENSE.txt

 Changes since the last public release (1.5.0):

@@ -32,7 +32,8 @@ version 1.5.1beta01 [January 8, 2011]
    from png_charpp to png_bytepp in png_get_iCCP().  This change happened
    in version 1.5.0beta36 but is not noted in the CHANGES.  Similarly,
    it was changed from png_charpp to png_const_bytepp in png_set_iCCP().
-  Ensure that png_rgb_to_gray ignores palette mapped images,
+  Ensure that png_rgb_to_gray ignores palette mapped images, if libpng
+    internally happens to call it with one.
  Fixed the failure to handle palette mapped images correctly.

 Version 1.5.1beta02 [January 14, 2011]
@@ -64,6 +65,56 @@ Version 1.5.1beta06 [January 20, 2011]
  Revised png_fixed() in png.c to avoid compiler warning about reaching the
    end without returning anything.

+Version 1.5.1beta07 [January 22, 2011]
+  In the manual, describe the png_get_IHDR() arguments in the correct order.
+  Added const_png_structp and const_png_infop types, and used them in
+    prototypes for most png_get_*() functions.
+
+Version 1.5.1beta08 [January 23, 2011]
+  Added png_get_io_chunk_type() and deprecated png_get_io_chunk_name()
+  Added synopses for the IO_STATE functions and other missing synopses
+    to the manual. Removed the synopses from libpngpf.3 because they
+    were out of date and no longer useful.  Better information can be
+    obtained by reading the prototypes and comments in pngpriv.h
+  Attempted to fix cpp on Solaris with S. Studio 12 cc, fix build
+    Added a make macro DFNCPP that is a CPP that will accept the tokens in
+    a .dfn file and adds configure stuff to test for such a CPP.  ./configure
+    should fail if one is not available.
+  Corrected const_png_ in png.h to png_const_ to avoid polluting the namespace.
+  Added png_get_current_row_number and png_get_current_pass_number for the
+    benefit of the user transform callback.
+  Added png_process_data_pause and png_process_data_skip for the benefit of
+    progressive readers that need to stop data processing or want to optimize
+    skipping of unread data (e.g. if the reader marks a chunk to be skipped.)
+
+Version 1.5.1beta09 [January 24, 2011]
+  Enhanced pngvalid, corrected an error in gray_to_rgb, corrected doc error.
+    pngvalid contains tests of transforms, which tests are currently disabled
+    because they are incompletely tested.  gray_to_rgb was failing to expand
+    the bit depth for smaller bit depth images; this seems to be a long
+    standing error and resulted, apparently, in invalid output.  The
+    documentation did not accurately describe what libpng really does when
+    converting RGB to gray.
+
+Version 1.5.1beta10 [January 27, 2010]
+  Fixed incorrect examples of callback prototypes in the manual, that were
+    introduced in libpng-1.0.0.
+  In addition the order of the png_get_uint macros with respect to the
+    relevant function definitions has been reversed.  This helps the
+    preprocessing of the symbol files be more robust.  Furthermore, the
+    symbol file preprocessing now uses -DPNG_NO_USE_READ_MACROS even when
+    the library may actually be built with PNG_USE_READ_MACROS; this stops
+    the read macros interfering with the symbol file format.
+  Made the manual, synopses, and function prototypes use the function
+    argument names file_gamma, int_file_gamma, and srgb_intent consistently.
+
+Version 1.5.1beta11 [January 28, 2011]
+  Changed PNG_UNUSED from "param=param;" to "{if(param){}}".
+  Corrected local variable type in new API png_process_data_skip()
+    The type was self-evidently incorrect but only causes problems on 64 bit
+    architectures.
+  Added transform tests to pngvalid and simplified the arguments.
+
 Send comments/corrections/commendations to png-mng-implement at lists.sf.net:
 (subscription required; visit
 https://lists.sourceforge.net/lists/listinfo/png-mng-implement
--- a/55
+++ b/55
@@ -3148,8 +3148,9 @@ version 1.5.1beta01 [January 8, 2011]
    from png_charpp to png_bytepp in png_get_iCCP().  This change happened
    in version 1.5.0beta36 but is not noted in the CHANGES.  Similarly,
    it was changed from png_charpp to png_const_bytepp in png_set_iCCP().
-  Ensure that png_rgb_to_gray ignores palette mapped images,
-  Fixed the failure to handle palette mapped images correctly.
+  Ensure that png_rgb_to_gray ignores palette mapped images, if libpng
+    internally happens to call it with one.
+  Fixed a failure to handle palette mapped images correctly.

 Version 1.5.1beta02 [January 14, 2011]
  Fixed a bug in handling of interlaced images (bero at arklinux.org).
@@ -3180,6 +3181,56 @@ Version 1.5.1beta06 [January 20, 2011]
  Revised png_fixed() in png.c to avoid compiler warning about reaching the
    end without returning anything.

+Version 1.5.1beta07 [January 22, 2011]
+  In the manual, describe the png_get_IHDR() arguments in the correct order.
+  Added const_png_structp and const_png_infop types, and used them in
+    prototypes for most png_get_*() functions.
+
+Version 1.5.1beta08 [January 23, 2011]
+  Added png_get_io_chunk_type() and deprecated png_get_io_chunk_name()
+  Added synopses for the IO_STATE functions and other missing synopses
+    to the manual. Removed the synopses from libpngpf.3 because they
+    were out of date and no longer useful.  Better information can be
+    obtained by reading the prototypes and comments in pngpriv.h
+  Attempted to fix cpp on Solaris with S. Studio 12 cc, fix build
+    Added a make macro DFNCPP that is a CPP that will accept the tokens in
+    a .dfn file and adds configure stuff to test for such a CPP.  ./configure
+    should fail if one is not available.
+  Corrected const_png_ in png.h to png_const_ to avoid polluting the namespace.
+  Added png_get_current_row_number and png_get_current_pass_number for the
+    benefit of the user transform callback.
+  Added png_process_data_pause and png_process_data_skip for the benefit of
+    progressive readers that need to stop data processing or want to optimize
+    skipping of unread data (e.g., if the reader marks a chunk to be skipped.)
+
+Version 1.5.1beta09 [January 24, 2011]
+  Enhanced pngvalid, corrected an error in gray_to_rgb, corrected doc error.
+    pngvalid contains tests of transforms, which tests are currently disabled
+    because they are incompletely tested.  gray_to_rgb was failing to expand
+    the bit depth for smaller bit depth images; this seems to be a long
+    standing error and resulted, apparently, in invalid output.  The
+    documentation did not accurately describe what libpng really does when
+    converting RGB to gray.
+
+Version 1.5.1beta10 [January 27, 2010]
+  Fixed incorrect examples of callback prototypes in the manual, that were
+    introduced in libpng-1.0.0.
+  In addition the order of the png_get_uint macros with respect to the
+    relevant function definitions has been reversed.  This helps the
+    preprocessing of the symbol files be more robust.  Furthermore, the
+    symbol file preprocessing now uses -DPNG_NO_USE_READ_MACROS even when
+    the library may actually be built with PNG_USE_READ_MACROS; this stops
+    the read macros interfering with the symbol file format.
+  Made the manual, synopses, and function prototypes use the function
+    argument names file_gamma, int_file_gamma, and srgb_intent consistently.
+
+Version 1.5.1beta11 [January 28, 2011]
+  Changed PNG_UNUSED from "param=param;" to "{if(param){}}".
+  Corrected local variable type in new API png_process_data_skip()
+    The type was self-evidently incorrect but only causes problems on 64 bit
+    architectures.
+  Added transform tests to pngvalid and simplified the arguments.
+
 Send comments/corrections/commendations to png-mng-implement at lists.sf.net
 (subscription required; visit
 https://lists.sourceforge.net/lists/listinfo/png-mng-implement
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -264,7 +264,7 @@ install(CODE ${PNG_CONFIG_INSTALL_CODE})
 # SET UP LINKS
 if(PNG_SHARED)
  set_target_properties(${PNG_LIB_NAME} PROPERTIES
-#   VERSION 15.${PNGLIB_RELEASE}.1.5.1beta06
+#   VERSION 15.${PNGLIB_RELEASE}.1.5.1beta11
    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 1.5.1beta06, January 20, 2011, are
+libpng versions 1.2.6, August 15, 2004, through 1.5.1beta11, January 28, 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
-January 20, 2011
+January 28, 2011
--- a/Makefile.am
+++ b/Makefile.am
@@ -81,6 +81,13 @@ CLEANFILES= dfn.c dfn?.out pngout.png libpng@PNGLIB_MAJOR@@PNGLIB_MINOR@.pc \
 MAINTAINERCLEANFILES = Makefile.in aclocal.m4 config.guess config.h.in \
 config.sub configure depcomp install-sh ltmain.sh missing

+# DFNCPP is normally just CPP - the C preprocessor - but on Solaris and maybe
+# other operating systems (NeXT?) the C preprocessor selected by configure
+# checks input tokens for validity - effectively it performs part of the ANSI-C
+# parsing - and therefore fails with the .df files.  configure.ac has special
+# checks for this and sets DFNCPP appropriately.
+DFNCPP = @DFNCPP@
+
 SUFFIXES = .chk .dfn .out

 $(PNGLIB_BASENAME).pc: libpng.pc
@@ -111,15 +118,19 @@ scripts/pnglibconf.h.prebuilt:
 # 'make test' is the first thing the user does.)
 pngvalid.o pngtest.o: pnglibconf.h

+# We must use -DPNG_NO_USE_READ_MACROS here even when the library may actually
+# be built with PNG_USE_READ_MACROS; this stops the read macros interfering
+# with the symbol file format.
 SYMBOL_CFLAGS = -DPNGLIB_LIBNAME='PNG@PNGLIB_MAJOR@@PNGLIB_MINOR@_0'\
 		-DPNGLIB_VERSION='@PNGLIB_VERSION@'\
-		-DSYMBOL_PREFIX='$(SYMBOL_PREFIX)'
+		-DSYMBOL_PREFIX='$(SYMBOL_PREFIX)'\
+		-DPNG_NO_USE_READ_MACROS

 .dfn.out:
 	rm -f $@ dfn.c dfn?.out
 	test -d scripts || mkdir scripts
 	echo '#include "$<"' >dfn.c
-	$(CPP) $(DEFS) $(DEFAULT_INCLUDES) $(INCLUDES) @LIBPNG_DEFINES@\
+	$(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'\
 	    dfn1.out >dfn2.out
--- a/Makefile.in
+++ b/Makefile.in
@@ -177,6 +177,13 @@ CPPFLAGS = @CPPFLAGS@
 CYGPATH_W = @CYGPATH_W@
 DEFS = @DEFS@
 DEPDIR = @DEPDIR@
+
+# DFNCPP is normally just CPP - the C preprocessor - but on Solaris and maybe
+# other operating systems (NeXT?) the C preprocessor selected by configure
+# checks input tokens for validity - effectively it performs part of the ANSI-C
+# parsing - and therefore fails with the .df files.  configure.ac has special
+# checks for this and sets DFNCPP appropriately.
+DFNCPP = @DFNCPP@
 DLLTOOL = @DLLTOOL@
 DSYMUTIL = @DSYMUTIL@
 DUMPBIN = @DUMPBIN@
@@ -348,9 +355,14 @@ MAINTAINERCLEANFILES = Makefile.in aclocal.m4 config.guess config.h.in \
 config.sub configure depcomp install-sh ltmain.sh missing

 SUFFIXES = .chk .dfn .out
+
+# We must use -DPNG_NO_USE_READ_MACROS here even when the library may actually
+# be built with PNG_USE_READ_MACROS; this stops the read macros interfering
+# with the symbol file format.
 SYMBOL_CFLAGS = -DPNGLIB_LIBNAME='PNG@PNGLIB_MAJOR@@PNGLIB_MINOR@_0'\
 		-DPNGLIB_VERSION='@PNGLIB_VERSION@'\
-		-DSYMBOL_PREFIX='$(SYMBOL_PREFIX)'
+		-DSYMBOL_PREFIX='$(SYMBOL_PREFIX)'\
+		-DPNG_NO_USE_READ_MACROS

 all: config.h
 	$(MAKE) $(AM_MAKEFLAGS) all-am
@@ -1278,7 +1290,7 @@ pngvalid.o pngtest.o: pnglibconf.h
 	rm -f $@ dfn.c dfn?.out
 	test -d scripts || mkdir scripts
 	echo '#include "$<"' >dfn.c
-	$(CPP) $(DEFS) $(DEFAULT_INCLUDES) $(INCLUDES) @LIBPNG_DEFINES@\
+	$(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'\
 	    dfn1.out >dfn2.out
--- a/2
+++ b/2
@@ -1,4 +1,4 @@
-README for libpng version 1.5.1beta06 - January 20, 2011 (shared library 15.0)
+README for libpng version 1.5.1beta11 - January 28, 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/71
+++ b/71
@@ -1,6 +1,6 @@
 #! /bin/sh
 # Guess values for system-dependent variables and create Makefiles.
-# Generated by GNU Autoconf 2.68 for libpng 1.5.1beta06
+# Generated by GNU Autoconf 2.68 for libpng 1.5.1beta11.
 #
 # 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='1.5.1beta06'
-PACKAGE_STRING='libpng 1.5.1beta06'
+PACKAGE_VERSION='1.5.1beta11'
+PACKAGE_STRING='libpng 1.5.1beta11'
 PACKAGE_BUGREPORT='png-mng-implement@lists.sourceforge.net'
 PACKAGE_URL=''

@@ -627,6 +627,7 @@ HAVE_LD_VERSION_SCRIPT_TRUE
 LIBPNG_DEFINES
 LIBOBJS
 POW_LIB
+DFNCPP
 OTOOL64
 OTOOL
 LIPO
@@ -1306,7 +1307,7 @@ 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 1.5.1beta06 to adapt to many kinds of systems.
+\`configure' configures libpng 1.5.1beta11 to adapt to many kinds of systems.

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

@@ -1376,7 +1377,7 @@ fi

 if test -n "$ac_init_help"; then
  case $ac_init_help in
-     short | recursive ) echo "Configuration of libpng 1.5.1beta06:";;
+     short | recursive ) echo "Configuration of libpng 1.5.1beta11:";;
   esac
  cat <<\_ACEOF

@@ -1484,7 +1485,7 @@ fi
 test -n "$ac_init_help" && exit $ac_status
 if $ac_init_version; then
  cat <<\_ACEOF
-libpng configure 1.5.1beta06
+libpng configure 1.5.1beta11
 generated by GNU Autoconf 2.68

 Copyright (C) 2010 Free Software Foundation, Inc.
@@ -1907,7 +1908,7 @@ 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 1.5.1beta06, which was
+It was created by libpng $as_me 1.5.1beta11, which was
 generated by GNU Autoconf 2.68.  Invocation command line was

  $ $0 $@
@@ -2722,7 +2723,7 @@ fi

 # Define the identity of the package.
 PACKAGE='libpng'
- VERSION='1.5.1beta06'
+ VERSION='1.5.1beta11'


 cat >>confdefs.h <<_ACEOF
@@ -2786,7 +2787,7 @@ fi



-PNGLIB_VERSION=1.5.1beta06
+PNGLIB_VERSION=1.5.1beta11
 PNGLIB_MAJOR=1
 PNGLIB_MINOR=5
 PNGLIB_RELEASE=1
@@ -2797,6 +2798,12 @@ ac_config_headers="$ac_config_headers config.h"


 # Checks for programs.
+ac_ext=c
+ac_cpp='$CPP $CPPFLAGS'
+ac_compile='$CC -c $CFLAGS $CPPFLAGS conftest.$ac_ext >&5'
+ac_link='$CC -o conftest$ac_exeext $CFLAGS $CPPFLAGS $LDFLAGS conftest.$ac_ext $LIBS >&5'
+ac_compiler_gnu=$ac_cv_c_compiler_gnu
+
 ac_ext=c
 ac_cpp='$CPP $CPPFLAGS'
 ac_compile='$CC -c $CFLAGS $CPPFLAGS conftest.$ac_ext >&5'
@@ -11809,6 +11816,46 @@ CC="$lt_save_CC"



+# On Solaris 10 and 12 CPP gets set to cc -E, however this still
+# does some input parsing.  We need strict ANSI-C style tokenization,
+# check this:
+
+{ $as_echo "$as_me:${as_lineno-$LINENO}: checking for a C preprocessor that does not parse its input" >&5
+$as_echo_n "checking for a C preprocessor that does not parse its input... " >&6; }
+cat confdefs.h - <<_ACEOF >conftest.$ac_ext
+/* end confdefs.h.  */
+1.5.0 16BIT
+_ACEOF
+if ac_fn_c_try_cpp "$LINENO"; then :
+  DFNCPP="$CPP"
+else
+  DFNCPP=""
+   sav_CPP="$CPP"
+   for CPP in "${CC-cc} -E" "${CC-cc} -E -traditional-cpp" "/lib/cpp" "cpp"; do
+      cat confdefs.h - <<_ACEOF >conftest.$ac_ext
+/* end confdefs.h.  */
+1.5.0 16BIT
+_ACEOF
+if ac_fn_c_try_cpp "$LINENO"; then :
+  DFNCPP="$CPP"
+         break
+fi
+rm -f conftest.err conftest.i conftest.$ac_ext
+   done
+   CPP="$sav_CPP"
+fi
+rm -f conftest.err conftest.i conftest.$ac_ext
+if test -n "$DFNCPP"; then
+   { $as_echo "$as_me:${as_lineno-$LINENO}: result: $DFNCPP" >&5
+$as_echo "$DFNCPP" >&6; }
+
+else
+   { { $as_echo "$as_me:${as_lineno-$LINENO}: error: in \`$ac_pwd':" >&5
+$as_echo "$as_me: error: in \`$ac_pwd':" >&2;}
+as_fn_error 1 "not found
+See \`config.log' for more details" "$LINENO" 5; }
+fi
+
 # Checks for header files.
 { $as_echo "$as_me:${as_lineno-$LINENO}: checking for ANSI C header files" >&5
 $as_echo_n "checking for ANSI C header files... " >&6; }
@@ -12365,7 +12412,7 @@ $as_echo_n "checking if libraries can be versioned... " >&6; }
 # support for version-script, but doesn't actually
 # DO anything with it.
 case $host in
-*cygwin* | *mingw32* )
+*cygwin* | *mingw32* | *interix* )
    have_ld_version_script=no
    { $as_echo "$as_me:${as_lineno-$LINENO}: result: no" >&5
 $as_echo "no" >&6; }
@@ -12993,7 +13040,7 @@ cat >>$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 1.5.1beta06, which was
+This file was extended by libpng $as_me 1.5.1beta11, which was
 generated by GNU Autoconf 2.68.  Invocation command line was

  CONFIG_FILES    = $CONFIG_FILES
@@ -13059,7 +13106,7 @@ _ACEOF
 cat >>$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 1.5.1beta06
+libpng config.status 1.5.1beta11
 configured by $0, generated by GNU Autoconf 2.68,
  with options \\"\$ac_cs_config\\"

--- a/configure.ac
+++ b/configure.ac
@@ -18,12 +18,12 @@ AC_PREREQ(2.59)

 dnl Version number stuff here:

-AC_INIT([libpng], [1.5.1beta06], [png-mng-implement@lists.sourceforge.net])
+AC_INIT([libpng], [1.5.1beta11], [png-mng-implement@lists.sourceforge.net])
 AM_INIT_AUTOMAKE
 dnl stop configure from automagically running automake
 AM_MAINTAINER_MODE

-PNGLIB_VERSION=1.5.1beta06
+PNGLIB_VERSION=1.5.1beta11
 PNGLIB_MAJOR=1
 PNGLIB_MINOR=5
 PNGLIB_RELEASE=1
@@ -34,6 +34,7 @@ AC_CONFIG_SRCDIR([pngget.c])
 AM_CONFIG_HEADER(config.h)

 # Checks for programs.
+AC_LANG([C])
 AC_PROG_CC
 AC_PROG_LD
 AC_PROG_CPP
@@ -44,6 +45,28 @@ AC_PROG_LN_S
 AC_PROG_MAKE_SET
 LT_INIT([win32-dll])

+# On Solaris 10 and 12 CPP gets set to cc -E, however this still
+# does some input parsing.  We need strict ANSI-C style tokenization,
+# check this:
+AC_REQUIRE_CPP
+AC_MSG_CHECKING([for a C preprocessor that does not parse its input])
+AC_TRY_CPP([1.5.0 16BIT],
+   [DFNCPP="$CPP"],
+   [DFNCPP=""
+   sav_CPP="$CPP"
+   for CPP in "${CC-cc} -E" "${CC-cc} -E -traditional-cpp" "/lib/cpp" "cpp"; do
+      AC_TRY_CPP([1.5.0 16BIT],
+         [DFNCPP="$CPP"]
+         [break],,)
+   done
+   CPP="$sav_CPP"])
+if test -n "$DFNCPP"; then
+   AC_MSG_RESULT([$DFNCPP])
+   AC_SUBST(DFNCPP)
+else
+   AC_MSG_FAILURE([not found], 1)
+fi
+
 # Checks for header files.
 AC_HEADER_STDC
 AC_CHECK_HEADERS([malloc.h stdlib.h string.h strings.h])
@@ -76,7 +99,7 @@ AC_MSG_CHECKING([if libraries can be versioned])
 # support for version-script, but doesn't actually
 # DO anything with it.
 case $host in
-*cygwin* | *mingw32* )
+*cygwin* | *mingw32* | *interix* )
    have_ld_version_script=no
    AC_MSG_RESULT(no)
 ;;
--- a/libpng-manual.txt
+++ b/libpng-manual.txt
--- a/libpng.3
+++ b/libpng.3
--- a/libpngpf.3
+++ b/libpngpf.3
@@ -1,908 +1,24 @@
-.TH LIBPNGPF 3 "January 20, 2011"
+.TH LIBPNGPF 3 "January 28, 2011"
 .SH NAME
-libpng \- Portable Network Graphics (PNG) Reference Library 1.5.1beta06
+libpng \- Portable Network Graphics (PNG) Reference Library 1.5.1beta11
 (private functions)
 .SH SYNOPSIS
 \fB#include \fI"pngpriv.h"

 \fI\fB

-\fBvoid png_64bit_product (long \fP\fIv1\fP\fB, long \fP\fIv2\fP\fB, unsigned long \fP\fI*hi_product\fP\fB, unsigned long \fI*lo_product\fP\fB);\fP
+\fBAs of libpng version \fP\fI1.5.1\fP\fB, this section is no longer \fP\fImaintained\fP\fB, now \fIthat

-\fI\fB
+\fBthe private function prototypes are hidden in pngpriv.h and not \fIaccessible

-\fI\fB
+\fBto applications. Look in pngpriv.h for the prototypes and a short \fIdescription

-\fBvoid png_ascii_from_fp (png_structp \fP\fIpng_ptr\fP\fB, png_charp \fP\fIascii\fP\fB, png_size_t \fP\fIsize\fP\fB, double \fP\fIfp\fP\fB, unsigned \fIprecision\fP\fB);\fP
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-\fI\fB
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-\fBvoid png_build_gamma_table (png_structp \fP\fIpng_ptr\fP\fB, png_byte \fIbit_depth\fP\fB);\fP
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-\fBvoid png_build_grayscale_palette (int \fP\fIbit_depth\fP\fB, png_colorp \fIpalette\fP\fB);\fP
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-\fBvoid png_calculate_crc (png_structp \fP\fIpng_ptr\fP\fB, png_bytep \fP\fIptr\fP\fB, png_size_t \fIlength\fP\fB);\fP
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-\fBint png_check_cHRM_fixed (png_structp \fP\fIpng_ptr\fP\fB, png_fixed_point \fP\fIint_white_x\fP\fB, png_fixed_point \fP\fIint_white_y\fP\fB, png_fixed_point \fP\fIint_red_x\fP\fB, png_fixed_point \fP\fIint_red_y\fP\fB, png_fixed_point \fP\fIint_green_x\fP\fB, png_fixed_point \fP\fIint_green_y\fP\fB, png_fixed_point \fP\fIint_blue_x\fP\fB, png_fixed_point \fIint_blue_y\fP\fB);\fP
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-\fBvoid png_check_chunk_name (png_structp \fP\fIpng_ptr\fP\fB, png_bytep \fIchunk_name\fP\fB);\fP
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-\fBint png_check_fp_number (png_charp \fP\fIstring\fP\fB, png_size_t \fP\fIsize\fP\fB, int* \fP\fIstatep\fP\fB, png_size_tp \fIwhereami\fP\fB);\fP
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-\fBint png_check_fp_string (png_charp \fP\fIstring\fP\fB, png_size_t \fIsize\fP\fB);\fP
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-\fBpng_size_t png_check_keyword (png_structp \fP\fIpng_ptr\fP\fB, png_charp \fP\fIkey\fP\fB, png_charpp \fInew_key\fP\fB);\fP
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-\fBvoid png_check_IHDR (png_structp \fP\fIpng_ptr\fP\fB, png_uint_32 \fP\fIwidth\fP\fB, png_uint_32 \fP\fIheight\fP\fB, int \fP\fIbit_depth\fP\fB, int \fP\fIcolor_type\fP\fB, int \fP\fIinterlace_type\fP\fB, int \fP\fIcompression_type\fP\fB, int \fIfilter_type\fP\fB);\fP
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-\fBvoid png_combine_row (png_structp \fP\fIpng_ptr\fP\fB, png_bytep \fP\fIrow\fP\fB, int \fImask\fP\fB);\fP
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-\fBvoid png_correct_palette (png_structp \fP\fIpng_ptr\fP\fB, png_colorp \fP\fIpalette\fP\fB, int \fInum_palette\fP\fB);\fP
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-\fBint png_crc_error (png_structp \fIpng_ptr\fP\fB);\fP
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-\fBint png_crc_finish (png_structp \fP\fIpng_ptr\fP\fB, png_uint_32 \fIskip\fP\fB);\fP
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-\fBvoid png_crc_read (png_structp \fP\fIpng_ptr\fP\fB, png_bytep \fP\fIbuf\fP\fB, png_size_t \fIlength\fP\fB);\fP
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-\fBpng_voidp png_create_struct (int \fItype\fP\fB);\fP
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-\fBpng_voidp png_create_struct_2 (int \fP\fItype\fP\fB, png_malloc_ptr \fP\fImalloc_fn\fP\fB, png_voidp \fImem_ptr\fP\fB);\fP
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-\fBint png_debug(int \fP\fIlevel\fP\fB, png_const_charp \fImessage\fP\fB);\fP
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-\fBint png_debug1(int \fP\fIlevel\fP\fB, png_const_charp \fP\fImessage\fP\fB, \fIp1\fP\fB);\fP
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-\fBint png_debug2(int \fP\fIlevel\fP\fB, png_const_charp \fP\fImessage\fP\fB, \fP\fIp1\fP\fB, \fIp2\fP\fB);\fP
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-\fI\fB
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-\fBvoid png_decompress_chunk (png_structp \fP\fIpng_ptr\fP\fB, int \fP\fIcomp_type\fP\fB, png_size_t \fP\fIchunklength\fP\fB, png_size_t \fP\fIprefix_length\fP\fB, png_size_t \fI*data_length\fP\fB);\fP
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-\fBvoid png_destroy_struct (png_voidp \fIstruct_ptr\fP\fB);\fP
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-\fBvoid png_destroy_struct_2 (png_voidp \fP\fIstruct_ptr\fP\fB, png_free_ptr \fP\fIfree_fn\fP\fB, png_voidp \fImem_ptr\fP\fB);\fP
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-\fBvoid png_do_background (png_row_infop \fP\fIrow_info\fP\fB, png_bytep \fP\fIrow\fP\fB, png_color_16p \fP\fItrans_color\fP\fB, png_color_16p \fP\fIbackground\fP\fB, png_color_16p \fP\fIbackground_1\fP\fB, png_bytep \fP\fIgamma_table\fP\fB, png_bytep \fP\fIgamma_from_1\fP\fB, png_bytep \fP\fIgamma_to_1\fP\fB, png_uint_16pp \fP\fIgamma_16\fP\fB, png_uint_16pp \fP\fIgamma_16_from_1\fP\fB, png_uint_16pp \fP\fIgamma_16_to_1\fP\fB, int \fIgamma_shift\fP\fB);\fP
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-\fBvoid png_do_bgr (png_row_infop \fP\fIrow_info\fP\fB, png_bytep \fIrow\fP\fB);\fP
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-\fBvoid png_do_chop (png_row_infop \fP\fIrow_info\fP\fB, png_bytep \fIrow\fP\fB);\fP
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-\fBvoid png_do_expand (png_row_infop \fP\fIrow_info\fP\fB, png_bytep \fP\fIrow\fP\fB, png_color_16p \fItrans_value\fP\fB);\fP
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-\fBvoid png_do_expand_palette (png_row_infop \fP\fIrow_info\fP\fB, png_bytep \fP\fIrow\fP\fB, png_colorp \fP\fIpalette\fP\fB, png_bytep \fP\fItrans\fP\fB, int \fInum_trans\fP\fB);\fP
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-\fBvoid png_do_gamma (png_row_infop \fP\fIrow_info\fP\fB, png_bytep \fP\fIrow\fP\fB, png_bytep \fP\fIgamma_table\fP\fB, png_uint_16pp \fP\fIgamma_16_table\fP\fB, int \fIgamma_shift\fP\fB);\fP
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-\fBvoid png_do_gray_to_rgb (png_row_infop \fP\fIrow_info\fP\fB, png_bytep \fIrow\fP\fB);\fP
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-\fBvoid png_do_invert (png_row_infop \fP\fIrow_info\fP\fB, png_bytep \fIrow\fP\fB);\fP
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-\fBvoid png_do_pack (png_row_infop \fP\fIrow_info\fP\fB, png_bytep \fP\fIrow\fP\fB, png_uint_32 \fIbit_depth\fP\fB);\fP
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-\fBvoid png_do_packswap (png_row_infop \fP\fIrow_info\fP\fB, png_bytep \fIrow\fP\fB);\fP
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-\fBvoid png_do_quantize (png_row_infop \fP\fIrow_info\fP\fB, png_bytep \fP\fIrow\fP\fB, png_bytep \fP\fIpalette_lookup\fP\fB, png_bytep \fIquantize_lookup\fP\fB);\fP
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-\fBvoid png_do_read_filler (png_row_infop \fP\fIrow_info\fP\fB, png_bytep \fP\fIrow\fP\fB, png_uint_32 \fP\fIfiller\fP\fB, png_uint_32 \fIflags\fP\fB);\fP
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-\fBvoid png_do_read_interlace (png_row_infop \fP\fIrow_info\fP\fB, png_bytep \fP\fIrow\fP\fB, int \fP\fIpass\fP\fB, png_uint_32 \fItransformations\fP\fB);\fP
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-\fBvoid png_do_read_invert_alpha (png_row_infop \fP\fIrow_info\fP\fB, png_bytep \fIrow\fP\fB);\fP
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-\fI\fB
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-\fBvoid png_do_read_swap_alpha (png_row_infop \fP\fIrow_info\fP\fB, png_bytep \fIrow\fP\fB);\fP
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-\fBvoid png_do_read_transformations (png_structp \fIpng_ptr\fP\fB);\fP
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-\fBint png_do_rgb_to_gray (png_row_infop \fP\fIrow_info\fP\fB, png_bytep \fIrow\fP\fB);\fP
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-\fBvoid png_do_shift (png_row_infop \fP\fIrow_info\fP\fB, png_bytep \fP\fIrow\fP\fB, png_color_8p \fIbit_depth\fP\fB);\fP
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-\fBvoid png_do_strip_filler (png_row_infop \fP\fIrow_info\fP\fB, png_bytep \fP\fIrow\fP\fB, png_uint_32 \fIflags\fP\fB);\fP
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-\fBvoid png_do_swap (png_row_infop \fP\fIrow_info\fP\fB, png_bytep \fIrow\fP\fB);\fP
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-\fBvoid png_do_unpack (png_row_infop \fP\fIrow_info\fP\fB, png_bytep \fIrow\fP\fB);\fP
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-\fBvoid png_do_unshift (png_row_infop \fP\fIrow_info\fP\fB, png_bytep \fP\fIrow\fP\fB, png_color_8p \fIsig_bits\fP\fB);\fP
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-\fBvoid png_do_write_interlace (png_row_infop \fP\fIrow_info\fP\fB, png_bytep \fP\fIrow\fP\fB, int \fIpass\fP\fB);\fP
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-\fBvoid png_do_write_invert_alpha (png_row_infop \fP\fIrow_info\fP\fB, png_bytep \fIrow\fP\fB);\fP
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-\fBvoid png_do_write_swap_alpha (png_row_infop \fP\fIrow_info\fP\fB, png_bytep \fIrow\fP\fB);\fP
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-\fBvoid png_do_write_transformations (png_structp \fIpng_ptr\fP\fB);\fP
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-\fBvoid *png_far_to_near (png_structp \fP\fIpng_ptr\fP\fB, png_voidp \fP\fIptr\fP\fB, int \fIcheck\fP\fB);\fP
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-\fBvoid png_fixed_error (png_structp \fP\fIpng_ptr\fP\fB, \fIpng_const_charp
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-\fBname, double \fIvalue\fP\fB);\fP
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-\fBvoid png_flush (png_structp \fIpng_ptr\fP\fB);\fP
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-\fBint png_gamma_significant (png_fixed_point \fIgamma\fP\fB);\fP
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-\fBpng_uint_16 png_gamma_16bit_correct (png_structp \fP\fIpng_ptr\fP\fB, unsigned \fP\fIvalue\fP\fB, png_fixed_point \fIgamma\fP\fB);\fP
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-\fBpng_byte png_gamma_8bit_correct (png_structp \fP\fIpng_ptr\fP\fB, unsigned \fP\fIvalue\fP\fB, png_fixed_point \fIgamma\fP\fB);\fP
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-\fBvoid png_handle_bKGD (png_structp \fP\fIpng_ptr\fP\fB, png_infop \fP\fIinfo_ptr\fP\fB, png_uint_32 \fIlength\fP\fB);\fP
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-\fBvoid png_handle_cHRM (png_structp \fP\fIpng_ptr\fP\fB, png_infop \fP\fIinfo_ptr\fP\fB, png_uint_32 \fIlength\fP\fB);\fP
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-\fBvoid png_handle_gAMA (png_structp \fP\fIpng_ptr\fP\fB, png_infop \fP\fIinfo_ptr\fP\fB, png_uint_32 \fIlength\fP\fB);\fP
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-\fBvoid png_handle_hIST (png_structp \fP\fIpng_ptr\fP\fB, png_infop \fP\fIinfo_ptr\fP\fB, png_uint_32 \fIlength\fP\fB);\fP
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-\fBvoid png_handle_IEND (png_structp \fP\fIpng_ptr\fP\fB, png_infop \fP\fIinfo_ptr\fP\fB, png_uint_32 \fIlength\fP\fB);\fP
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-\fBvoid png_handle_IHDR (png_structp \fP\fIpng_ptr\fP\fB, png_infop \fP\fIinfo_ptr\fP\fB, png_uint_32 \fIlength\fP\fB);\fP
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-\fBvoid png_handle_iCCP (png_structp \fP\fIpng_ptr\fP\fB, png_infop \fP\fIinfo_ptr\fP\fB, png_uint_32 \fIlength\fP\fB);\fP
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-\fBvoid png_handle_iTXt (png_structp \fP\fIpng_ptr\fP\fB, png_infop \fP\fIinfo_ptr\fP\fB, png_uint_32 \fIlength\fP\fB);\fP
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-\fBvoid png_handle_oFFs (png_structp \fP\fIpng_ptr\fP\fB, png_infop \fP\fIinfo_ptr\fP\fB, png_uint_32 \fIlength\fP\fB);\fP
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-\fBvoid png_handle_pCAL (png_structp \fP\fIpng_ptr\fP\fB, png_infop \fP\fIinfo_ptr\fP\fB, png_uint_32 \fIlength\fP\fB);\fP
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-\fBvoid png_handle_pHYs (png_structp \fP\fIpng_ptr\fP\fB, png_infop \fP\fIinfo_ptr\fP\fB, png_uint_32 \fIlength\fP\fB);\fP
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-\fBvoid png_handle_PLTE (png_structp \fP\fIpng_ptr\fP\fB, png_infop \fP\fIinfo_ptr\fP\fB, png_uint_32 \fIlength\fP\fB);\fP
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-\fBvoid png_handle_sBIT (png_structp \fP\fIpng_ptr\fP\fB, png_infop \fP\fIinfo_ptr\fP\fB, png_uint_32 \fIlength\fP\fB);\fP
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-\fBvoid png_handle_sCAL (png_structp \fP\fIpng_ptr\fP\fB, png_infop \fP\fIinfo_ptr\fP\fB, png_uint_32 \fIlength\fP\fB);\fP
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-\fBvoid png_handle_sPLT (png_structp \fP\fIpng_ptr\fP\fB, png_infop \fP\fIinfo_ptr\fP\fB, png_uint_32 \fIlength\fP\fB);\fP
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-\fBvoid png_handle_sRGB (png_structp \fP\fIpng_ptr\fP\fB, png_infop \fP\fIinfo_ptr\fP\fB, png_uint_32 \fIlength\fP\fB);\fP
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-\fBvoid png_handle_tEXt (png_structp \fP\fIpng_ptr\fP\fB, png_infop \fP\fIinfo_ptr\fP\fB, png_uint_32 \fIlength\fP\fB);\fP
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-\fBvoid png_handle_tIME (png_structp \fP\fIpng_ptr\fP\fB, png_infop \fP\fIinfo_ptr\fP\fB, png_uint_32 \fIlength\fP\fB);\fP
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-\fBvoid png_handle_tRNS (png_structp \fP\fIpng_ptr\fP\fB, png_infop \fP\fIinfo_ptr\fP\fB, png_uint_32 \fIlength\fP\fB);\fP
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-\fBvoid png_handle_unknown (png_structp \fP\fIpng_ptr\fP\fB, png_infop \fP\fIinfo_ptr\fP\fB, png_uint_32 \fIlength\fP\fB);\fP
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-\fBvoid png_handle_zTXt (png_structp \fP\fIpng_ptr\fP\fB, png_infop \fP\fIinfo_ptr\fP\fB, png_uint_32 \fIlength\fP\fB);\fP
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-\fBvoid png_info_destroy (png_structp \fP\fIpng_ptr\fP\fB, png_infop \fIinfo_ptr\fP\fB);\fP
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-\fBvoid png_init_mmx_flags (png_structp \fIpng_ptr\fP\fB);\fP
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-\fBvoid png_init_read_transformations (png_structp \fIpng_ptr\fP\fB);\fP
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-\fI\fB
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-\fBint png_muldiv (png_fixed_point_p \fP\fIres\fP\fB, png_fixed_point \fP\fIa\fP\fB, png_int_32 \fP\fItimes\fP\fB, png_int_32 \fIdiv\fP\fB);\fP
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-\fBpng_fixed_point png_muldiv_warn (png_structp \fP\fIpng_ptr\fP\fB, png_fixed_point \fP\fIa\fP\fB, png_int_32 \fP\fItimes\fP\fB, png_int_32 \fIdiv\fP\fB);\fP
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-\fI\fB
-
-\fBvoid png_process_IDAT_data (png_structp \fP\fIpng_ptr\fP\fB, png_bytep \fP\fIbuffer\fP\fB, png_size_t \fIbuffer_length\fP\fB);\fP
-
-\fI\fB
-
-\fI\fB
-
-\fBvoid png_process_some_data (png_structp \fP\fIpng_ptr\fP\fB, png_infop \fIinfo_ptr\fP\fB);\fP
-
-\fI\fB
-
-\fI\fB
-
-\fBvoid png_push_check_crc (png_structp \fIpng_ptr\fP\fB);\fP
-
-\fI\fB
-
-\fI\fB
-
-\fBvoid png_push_crc_finish (png_structp \fIpng_ptr\fP\fB);\fP
-
-\fI\fB
-
-\fI\fB
-
-\fBvoid png_push_crc_skip (png_structp \fP\fIpng_ptr\fP\fB, png_uint_32 \fIlength\fP\fB);\fP
-
-\fI\fB
-
-\fI\fB
-
-\fBvoid png_push_fill_buffer (png_structp \fP\fIpng_ptr\fP\fB, png_bytep \fP\fIbuffer\fP\fB, png_size_t \fIlength\fP\fB);\fP
-
-\fI\fB
-
-\fI\fB
-
-\fBvoid png_push_handle_tEXt (png_structp \fP\fIpng_ptr\fP\fB, png_infop \fP\fIinfo_ptr\fP\fB, png_uint_32 \fIlength\fP\fB);\fP
-
-\fI\fB
-
-\fI\fB
-
-\fBvoid png_push_handle_unknown (png_structp \fP\fIpng_ptr\fP\fB, png_infop \fP\fIinfo_ptr\fP\fB, png_uint_32 \fIlength\fP\fB);\fP
-
-\fI\fB
-
-\fI\fB
-
-\fBvoid png_push_handle_zTXt (png_structp \fP\fIpng_ptr\fP\fB, png_infop \fP\fIinfo_ptr\fP\fB, png_uint_32 \fIlength\fP\fB);\fP
-
-\fI\fB
-
-\fI\fB
-
-\fBvoid png_push_have_end (png_structp \fP\fIpng_ptr\fP\fB, png_infop \fIinfo_ptr\fP\fB);\fP
-
-\fI\fB
-
-\fI\fB
-
-\fBvoid png_push_have_info (png_structp \fP\fIpng_ptr\fP\fB, png_infop \fIinfo_ptr\fP\fB);\fP
-
-\fI\fB
-
-\fI\fB
-
-\fBvoid png_push_have_row (png_structp \fP\fIpng_ptr\fP\fB, png_bytep \fIrow\fP\fB);\fP
-
-\fI\fB
-
-\fI\fB
-
-\fBvoid png_push_process_row (png_structp \fIpng_ptr\fP\fB);\fP
-
-\fI\fB
-
-\fI\fB
-
-\fBvoid png_push_read_chunk (png_structp \fP\fIpng_ptr\fP\fB, png_infop \fIinfo_ptr\fP\fB);\fP
-
-\fI\fB
-
-\fI\fB
-
-\fBvoid png_push_read_end (png_structp \fP\fIpng_ptr\fP\fB, png_infop \fIinfo_ptr\fP\fB);\fP
-
-\fI\fB
-
-\fI\fB
-
-\fBvoid png_push_read_IDAT (png_structp \fIpng_ptr\fP\fB);\fP
-
-\fI\fB
-
-\fI\fB
-
-\fBvoid png_push_read_sig (png_structp \fP\fIpng_ptr\fP\fB, png_infop \fIinfo_ptr\fP\fB);\fP
-
-\fI\fB
-
-\fI\fB
-
-\fBvoid png_push_read_tEXt (png_structp \fP\fIpng_ptr\fP\fB, png_infop \fIinfo_ptr\fP\fB);\fP
-
-\fI\fB
-
-\fI\fB
-
-\fBvoid png_push_read_zTXt (png_structp \fP\fIpng_ptr\fP\fB, png_infop \fIinfo_ptr\fP\fB);\fP
-
-\fI\fB
-
-\fI\fB
-
-\fBvoid png_push_restore_buffer (png_structp \fP\fIpng_ptr\fP\fB, png_bytep \fP\fIbuffer\fP\fB, png_size_t \fIbuffer_length\fP\fB);\fP
-
-\fI\fB
-
-\fI\fB
-
-\fBvoid png_push_save_buffer (png_structp \fIpng_ptr\fP\fB);\fP
-
-\fI\fB
-
-\fI\fB
-
-\fBvoid png_read_data (png_structp \fP\fIpng_ptr\fP\fB, png_bytep \fP\fIdata\fP\fB, png_size_t \fIlength\fP\fB);\fP
-
-\fI\fB
-
-\fBvoid png_read_destroy (png_structp \fP\fIpng_ptr\fP\fB, png_infop \fP\fIinfo_ptr\fP\fB, png_infop \fIend_info_ptr\fP\fB);\fP
-
-\fI\fB
-
-\fBvoid png_read_filter_row (png_structp \fP\fIpng_ptr\fP\fB, png_row_infop \fP\fIrow_info\fP\fB, png_bytep \fP\fIrow\fP\fB, png_bytep \fP\fIprev_row\fP\fB, int \fIfilter\fP\fB);\fP
-
-\fI\fB
-
-\fI\fB
-
-\fBvoid png_read_finish_row (png_structp \fIpng_ptr\fP\fB);\fP
-
-\fI\fB
-
-\fBvoid png_read_push_finish_row (png_structp \fIpng_ptr\fP\fB);\fP
-
-\fI\fB
-
-\fBvoid png_read_start_row (png_structp \fIpng_ptr\fP\fB);\fP
-
-\fI\fB
-
-\fBvoid png_read_sig (png_structp \fP\fIpng_ptr\fP\fB, png_infop \fIinfo_ptr\fP\fB);\fP
-
-\fI\fB
-
-\fBvoid png_read_transform_info (png_structp \fP\fIpng_ptr\fP\fB, png_infop \fIinfo_ptr\fP\fB);\fP
-
-\fI\fB
-
-\fBpng_fixed_point png_reciprocal (png_fixed_point \fIa\fP\fB);\fP
-
-\fI\fB
-
-\fBpng_fixed_point png_reciprocal2 (png_fixed_point \fP\fIa\fP\fB, png_fixed_point \fIb\fP\fB);\fP
-
-\fI\fB
-
-\fBvoid png_reset_crc (png_structp \fIpng_ptr\fP\fB);\fP
-
-\fI\fB
-
-\fBint png_set_text_2 (png_structp \fP\fIpng_ptr\fP\fB, png_infop \fP\fIinfo_ptr\fP\fB, png_textp \fP\fItext_ptr\fP\fB, int \fInum_text\fP\fB);\fP
-
-\fI\fB
-
-\fBvoid png_write_cHRM (png_structp \fP\fIpng_ptr\fP\fB, double \fP\fIwhite_x\fP\fB, double \fP\fIwhite_y\fP\fB, double \fP\fIred_x\fP\fB, double \fP\fIred_y\fP\fB, double \fP\fIgreen_x\fP\fB, double \fP\fIgreen_y\fP\fB, double \fP\fIblue_x\fP\fB, double \fIblue_y\fP\fB);\fP
-
-\fI\fB
-
-\fI\fB
-
-\fBvoid png_write_cHRM_fixed (png_structp \fP\fIpng_ptr\fP\fB, png_uint_32 \fP\fIwhite_x\fP\fB, png_uint_32 \fP\fIwhite_y\fP\fB, png_uint_32 \fP\fIred_x\fP\fB, png_uint_32 \fP\fIred_y\fP\fB, png_uint_32 \fP\fIgreen_x\fP\fB, png_uint_32 \fP\fIgreen_y\fP\fB, png_uint_32 \fP\fIblue_x\fP\fB, png_uint_32 \fIblue_y\fP\fB);\fP
-
-\fI\fB
-
-\fI\fB
-
-\fBvoid png_write_data (png_structp \fP\fIpng_ptr\fP\fB, png_bytep \fP\fIdata\fP\fB, png_size_t \fIlength\fP\fB);\fP
-
-\fI\fB
-
-\fBvoid png_write_destroy (png_structp \fIpng_ptr\fP\fB);\fP
-
-\fI\fB
-
-\fBvoid png_write_filtered_row (png_structp \fP\fIpng_ptr\fP\fB, png_bytep \fIfiltered_row\fP\fB);\fP
-
-\fI\fB
-
-\fI\fB
-
-\fBvoid png_write_find_filter (png_structp \fP\fIpng_ptr\fP\fB, png_row_infop \fIrow_info\fP\fB);\fP
-
-\fI\fB
-
-\fI\fB
-
-\fBvoid png_write_finish_row (png_structp \fIpng_ptr\fP\fB);\fP
-
-\fI\fB
-
-\fI\fB
-
-\fBvoid png_write_gAMA (png_structp \fP\fIpng_ptr\fP\fB, double \fIfile_gamma\fP\fB);\fP
-
-\fI\fB
-
-\fI\fB
-
-\fBvoid png_write_gAMA_fixed (png_structp \fP\fIpng_ptr\fP\fB, png_uint_32 \fIint_file_gamma\fP\fB);\fP
-
-\fI\fB
-
-\fI\fB
-
-\fBvoid png_write_hIST (png_structp \fP\fIpng_ptr\fP\fB, png_uint_16p \fP\fIhist\fP\fB, int \fInum_hist\fP\fB);\fP
-
-\fI\fB
-
-\fI\fB
-
-\fBvoid png_write_iCCP (png_structp \fP\fIpng_ptr\fP\fB, png_charp \fP\fIname\fP\fB, int \fP\fIcompression_type\fP\fB, png_charp \fP\fIprofile\fP\fB, int \fIproflen\fP\fB);\fP
-
-\fI\fB
-
-\fI\fB
-
-\fBvoid png_write_IDAT (png_structp \fP\fIpng_ptr\fP\fB, png_bytep \fP\fIdata\fP\fB, png_size_t \fIlength\fP\fB);\fP
-
-\fI\fB
-
-\fI\fB
-
-\fBvoid png_write_IEND (png_structp \fIpng_ptr\fP\fB);\fP
-
-\fI\fB
-
-\fI\fB
-
-\fBvoid png_write_IHDR (png_structp \fP\fIpng_ptr\fP\fB, png_uint_32 \fP\fIwidth\fP\fB, png_uint_32 \fP\fIheight\fP\fB, int \fP\fIbit_depth\fP\fB, int \fP\fIcolor_type\fP\fB, int \fP\fIcompression_type\fP\fB, int \fP\fIfilter_type\fP\fB, int \fIinterlace_type\fP\fB);\fP
-
-\fI\fB
-
-\fI\fB
-
-\fBvoid png_write_iTXt (png_structp \fP\fIpng_ptr\fP\fB, int \fP\fIcompression\fP\fB, png_charp \fP\fIkey\fP\fB, png_charp \fP\fIlang\fP\fB, png_charp \fP\fItranslated_key\fP\fB, png_charp \fItext\fP\fB);\fP
-
-\fI\fB
-
-\fI\fB
-
-\fBvoid png_write_oFFs (png_structp \fP\fIpng_ptr\fP\fB, png_uint_32 \fP\fIx_offset\fP\fB, png_uint_32 \fP\fIy_offset\fP\fB, int \fIunit_type\fP\fB);\fP
-
-\fI\fB
-
-\fI\fB
-
-\fBvoid png_write_pCAL (png_structp \fP\fIpng_ptr\fP\fB, png_charp \fP\fIpurpose\fP\fB, png_int_32 \fP\fIX0\fP\fB, png_int_32 \fP\fIX1\fP\fB, int \fP\fItype\fP\fB, int \fP\fInparams\fP\fB, png_charp \fP\fIunits\fP\fB, png_charpp \fIparams\fP\fB);\fP
-
-\fI\fB
-
-\fI\fB
-
-\fBvoid png_write_pHYs (png_structp \fP\fIpng_ptr\fP\fB, png_uint_32 \fP\fIx_pixels_per_unit\fP\fB, png_uint_32 \fP\fIy_pixels_per_unit\fP\fB, int \fIunit_type\fP\fB);\fP
-
-\fI\fB
-
-\fI\fB
-
-\fBvoid png_write_PLTE (png_structp \fP\fIpng_ptr\fP\fB, png_colorp \fP\fIpalette\fP\fB, png_uint_32 \fInum_pal\fP\fB);\fP
-
-\fI\fB
-
-\fI\fB
-
-\fBvoid png_write_sBIT (png_structp \fP\fIpng_ptr\fP\fB, png_color_8p \fP\fIsbit\fP\fB, int \fIcolor_type\fP\fB);\fP
-
-\fI\fB
-
-\fI\fB
-
-\fBvoid png_write_sCAL (png_structp \fP\fIpng_ptr\fP\fB, png_charp \fP\fIunit\fP\fB, double \fP\fIwidth\fP\fB, double \fIheight\fP\fB);\fP
-
-\fI\fB
-
-\fI\fB
-
-\fBvoid png_write_sCAL_s (png_structp \fP\fIpng_ptr\fP\fB, png_charp \fP\fIunit\fP\fB, png_charp \fP\fIwidth\fP\fB, png_charp \fIheight\fP\fB);\fP
-
-\fI\fB
-
-\fI\fB
-
-\fBvoid png_write_sRGB (png_structp \fP\fIpng_ptr\fP\fB, int \fIintent\fP\fB);\fP
-
-\fI\fB
-
-\fI\fB
-
-\fBvoid png_write_sPLT (png_structp \fP\fIpng_ptr\fP\fB, png_spalette_p \fIpalette\fP\fB);\fP
-
-\fI\fB
-
-\fI\fB
-
-\fBvoid png_write_start_row (png_structp \fIpng_ptr\fP\fB);\fP
-
-\fI\fB
-
-\fI\fB
-
-\fBvoid png_write_tEXt (png_structp \fP\fIpng_ptr\fP\fB, png_charp \fP\fIkey\fP\fB, png_charp \fP\fItext\fP\fB, png_size_t \fItext_len\fP\fB);\fP
-
-\fI\fB
-
-\fI\fB
-
-\fBvoid png_write_tIME (png_structp \fP\fIpng_ptr\fP\fB, png_timep \fImod_time\fP\fB);\fP
-
-\fI\fB
-
-\fI\fB
-
-\fBvoid png_write_tRNS (png_structp \fP\fIpng_ptr\fP\fB, png_bytep \fP\fItrans\fP\fB, png_color_16p \fP\fIvalues\fP\fB, int \fP\fInumber\fP\fB, int \fIcolor_type\fP\fB);\fP
-
-\fI\fB
-
-\fI\fB
-
-\fBvoid png_write_zTXt (png_structp \fP\fIpng_ptr\fP\fB, png_charp \fP\fIkey\fP\fB, png_charp \fP\fItext\fP\fB, png_size_t \fP\fItext_len\fP\fB, int \fIcompression\fP\fB);\fP
-
-\fI\fB
-
-\fI\fB
-
-\fBvoidpf png_zalloc (voidpf \fP\fIpng_ptr\fP\fB, uInt \fP\fIitems\fP\fB, uInt \fIsize\fP\fB);\fP
-
-\fI\fB
-
-\fI\fB
-
-\fBvoid png_zfree (voidpf \fP\fIpng_ptr\fP\fB, voidpf \fIptr\fP\fB);\fP
-
-\fI\fB
-
-\fBvoid png_fixed_error (png_structp \fP\fIpng_ptr\fP\fB, png_const_charp \fP\fIname\fP\fB, double \fIvalue\fP\fB);\fP
+\fBof each \fIfunction.

 \fI\fB

 .SH DESCRIPTION
-The functions listed above are used privately by libpng
+The functions previously listed here are  used privately by libpng
 and are not recommended for use by applications.  They are
 not "exported" to applications using shared libraries.  They
 are listed alphabetically here as an aid to libpng maintainers.
--- a/png.5
+++ b/png.5
@@ -1,4 +1,4 @@
-.TH PNG 5 "January 20, 2011"
+.TH PNG 5 "January 28, 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 1.5.0 [January 6, 2011]
+ * Last changed in libpng 1.5.1 [(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.)
@@ -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_1beta06 Your_png_h_is_not_version_1_5_1beta06;
+typedef png_libpng_version_1_5_1beta11 Your_png_h_is_not_version_1_5_1beta11;

 /* 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
@@ -547,7 +547,7 @@ png_convert_to_rfc1123(png_structp png_ptr, png_const_timep ptime)
 #endif /* defined(PNG_READ_SUPPORTED) || defined(PNG_WRITE_SUPPORTED) */

 png_const_charp PNGAPI
-png_get_copyright(png_structp png_ptr)
+png_get_copyright(png_const_structp png_ptr)
 {
   PNG_UNUSED(png_ptr)  /* Silence compiler warning about unused png_ptr */
 #ifdef PNG_STRING_COPYRIGHT
@@ -555,13 +555,13 @@ png_get_copyright(png_structp png_ptr)
 #else
 #  ifdef __STDC__
   return PNG_STRING_NEWLINE \
-     "libpng version 1.5.1beta06 - January 20, 2011" PNG_STRING_NEWLINE \
+     "libpng version 1.5.1beta11 - January 28, 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 1.5.1beta06 - January 20, 2011\
+      return "libpng version 1.5.1beta11 - January 28, 2011\
      Copyright (c) 1998-2011 Glenn Randers-Pehrson\
      Copyright (c) 1996-1997 Andreas Dilger\
      Copyright (c) 1995-1996 Guy Eric Schalnat, Group 42, Inc.";
@@ -578,14 +578,14 @@ png_get_copyright(png_structp png_ptr)
 * it is guaranteed that png.c uses the correct version of png.h.
 */
 png_const_charp PNGAPI
-png_get_libpng_ver(png_structp png_ptr)
+png_get_libpng_ver(png_const_structp png_ptr)
 {
   /* Version of *.c files used when building libpng */
   return png_get_header_ver(png_ptr);
 }

 png_const_charp PNGAPI
-png_get_header_ver(png_structp png_ptr)
+png_get_header_ver(png_const_structp png_ptr)
 {
   /* Version of *.h files used when building libpng */
   PNG_UNUSED(png_ptr)  /* Silence compiler warning about unused png_ptr */
@@ -593,7 +593,7 @@ png_get_header_ver(png_structp png_ptr)
 }

 png_const_charp PNGAPI
-png_get_header_version(png_structp png_ptr)
+png_get_header_version(png_const_structp png_ptr)
 {
   /* Returns longer string containing both version and date */
   PNG_UNUSED(png_ptr)  /* Silence compiler warning about unused png_ptr */
--- a/png.h
+++ b/png.h
@@ -1,7 +1,7 @@

 /* png.h - header file for PNG reference library
 *
- * libpng version 1.5.1beta06 - January 20, 2011
+ * libpng version 1.5.1beta11 - January 28, 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 1.5.1beta06 - January 20, 2011: Glenn
+ *   libpng versions 0.97, January 1998, through 1.5.1beta11 - January 28, 2011: Glenn
 *   See also "Contributing Authors", below.
 *
 * Note about libpng version numbers:
@@ -144,7 +144,8 @@
 *    1.5.0beta01-58          15    10500  15.so.15.0[.0]
 *    1.5.0rc01-07            15    10500  15.so.15.0[.0]
 *    1.5.0                   15    10500  15.so.15.0[.0]
- *    1.5.1beta01-06          15    10501  15.so.15.1[.0]
+ *    1.5.1beta01-10          15    10501  15.so.15.1[.0]
+ *    1.5.1rc01               15    10501  15.so.15.1[.0]
 *
 *   Henceforth the source version will match the shared-library major
 *   and minor numbers; the shared-library major version number will be
@@ -176,7 +177,7 @@
 *
 * This code is released under the libpng license.
 *
- * libpng versions 1.2.6, August 15, 2004, through 1.5.1beta06, January 20, 2011, are
+ * libpng versions 1.2.6, August 15, 2004, through 1.5.1beta11, January 28, 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:
@@ -288,13 +289,13 @@
 * Y2K compliance in libpng:
 * =========================
 *
- *    January 20, 2011
+ *    January 28, 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 1.5.1beta06 are Y2K compliant.  It is my belief that
+ *    upward through 1.5.1beta11 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
@@ -350,9 +351,9 @@
 */

 /* Version information for png.h - this should match the version in png.c */
-#define PNG_LIBPNG_VER_STRING "1.5.1beta06"
+#define PNG_LIBPNG_VER_STRING "1.5.1beta11"
 #define PNG_HEADER_VERSION_STRING \
-     " libpng version 1.5.1beta06 - January 20, 2011\n"
+     " libpng version 1.5.1beta11 - January 28, 2011\n"

 #define PNG_LIBPNG_VER_SONUM   15
 #define PNG_LIBPNG_VER_DLLNUM  15
@@ -365,7 +366,7 @@
 * PNG_LIBPNG_VER_STRING, omitting any leading zero:
 */

-#define PNG_LIBPNG_VER_BUILD  06
+#define PNG_LIBPNG_VER_BUILD  11

 /* Release Status */
 #define PNG_LIBPNG_BUILD_ALPHA    1
@@ -507,7 +508,7 @@ 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_1beta06;
+typedef char* png_libpng_version_1_5_1beta11;

 /* 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
@@ -663,6 +664,7 @@ typedef png_unknown_chunk FAR * FAR * png_unknown_chunkpp;

 typedef struct png_info_def png_info;
 typedef png_info FAR * png_infop;
+typedef PNG_CONST png_info FAR * png_const_infop;
 typedef png_info FAR * FAR * png_infopp;

 /* Maximum positive integer used in PNG is (2^31)-1 */
@@ -790,6 +792,7 @@ typedef png_row_info FAR * FAR * png_row_infopp;
 * expected to return the read data in the buffer.
 */
 typedef struct png_struct_def png_struct;
+typedef PNG_CONST png_struct FAR * png_const_structp;
 typedef png_struct FAR * png_structp;

 typedef PNG_CALLBACK(void, *png_error_ptr, (png_structp, png_const_charp), );
@@ -945,7 +948,7 @@ PNG_EXPORTA(5, png_structp, png_create_write_struct,
    PNG_ALLOCATED);

 PNG_EXPORT(6, png_size_t, png_get_compression_buffer_size,
-    (png_structp png_ptr));
+    (png_const_structp png_ptr));

 PNG_EXPORT(7, void, png_set_compression_buffer_size, (png_structp png_ptr, 
    png_size_t size));
@@ -1065,14 +1068,17 @@ PNG_EXPORT(30, void, png_set_bgr, (png_structp png_ptr));
 #ifdef PNG_READ_GRAY_TO_RGB_SUPPORTED
 /* Expand the grayscale to 24-bit RGB if necessary. */
 PNG_EXPORT(31, void, png_set_gray_to_rgb, (png_structp png_ptr));
+#endif

+#ifdef PNG_READ_RGB_TO_GRAY_SUPPORTED
 /* Reduce RGB to grayscale. */
 PNG_FP_EXPORT(32, void, png_set_rgb_to_gray, (png_structp png_ptr,
    int error_action, double red, double green));
 PNG_FIXED_EXPORT(33, void, png_set_rgb_to_gray_fixed, (png_structp png_ptr, 
    int error_action, png_fixed_point red, png_fixed_point green));

-PNG_EXPORT(34, png_byte, png_get_rgb_to_gray_status, (png_structp png_ptr));
+PNG_EXPORT(34, png_byte, png_get_rgb_to_gray_status, (png_const_structp
+    png_ptr));
 #endif

 PNG_EXPORT(35, void, png_build_grayscale_palette, (int bit_depth, 
@@ -1409,7 +1415,7 @@ PNG_EXPORT(75, void, png_set_error_fn,
    png_error_ptr error_fn, png_error_ptr warning_fn));

 /* Return the user pointer associated with the error functions */
-PNG_EXPORT(76, png_voidp, png_get_error_ptr, (png_structp png_ptr));
+PNG_EXPORT(76, png_voidp, png_get_error_ptr, (png_const_structp png_ptr));

 /* Replace the default data output functions with a user supplied one(s).
 * If buffered output is not used, then output_flush_fn can be set to NULL.
@@ -1442,7 +1448,7 @@ PNG_EXPORT(81, void, png_set_write_status_fn, (png_structp png_ptr,
 PNG_EXPORT(82, void, png_set_mem_fn, (png_structp png_ptr, png_voidp mem_ptr, 
    png_malloc_ptr malloc_fn, png_free_ptr free_fn));
 /* Return the user pointer associated with the memory functions */
-PNG_EXPORT(83, png_voidp, png_get_mem_ptr, (png_structp png_ptr));
+PNG_EXPORT(83, png_voidp, png_get_mem_ptr, (png_const_structp png_ptr));
 #endif

 #ifdef PNG_READ_USER_TRANSFORM_SUPPORTED
@@ -1455,19 +1461,31 @@ PNG_EXPORT(85, void, png_set_write_user_transform_fn, (png_structp png_ptr,
    png_user_transform_ptr write_user_transform_fn));
 #endif

-#if defined(PNG_READ_USER_TRANSFORM_SUPPORTED) || \
-    defined(PNG_WRITE_USER_TRANSFORM_SUPPORTED)
+#ifdef PNG_USER_TRANSFORM_PTR_SUPPORTED
 PNG_EXPORT(86, void, png_set_user_transform_info, (png_structp png_ptr, 
    png_voidp user_transform_ptr, int user_transform_depth, 
    int user_transform_channels));
 /* Return the user pointer associated with the user transform functions */
-PNG_EXPORT(87, png_voidp, png_get_user_transform_ptr, (png_structp png_ptr));
+PNG_EXPORT(87, png_voidp, png_get_user_transform_ptr,
+    (png_const_structp png_ptr));
+#endif
+
+#ifdef PNG_USER_TRANSFORM_INFO_SUPPORTED
+/* Return information about the row currently being processed.  Note that these
+ * APIs do not fail but will return unexpected results if called outside a user
+ * transform callback.  Also note that when transforming an interlaced image the
+ * row number is still the row in the final, de-interlaced, image but the row
+ * only contains the data of the current pass - consult png_row_info for the
+ * actual width of the row!
+ */
+PNG_EXPORT(217, png_uint_32, png_get_current_row_number, (png_const_structp));
+PNG_EXPORT(218, png_byte, png_get_current_pass_number, (png_const_structp));
 #endif

 #ifdef PNG_USER_CHUNKS_SUPPORTED
 PNG_EXPORT(88, void, png_set_read_user_chunk_fn, (png_structp png_ptr, 
    png_voidp user_chunk_ptr, png_user_chunk_ptr read_user_chunk_fn));
-PNG_EXPORT(89, png_voidp, png_get_user_chunk_ptr, (png_structp png_ptr));
+PNG_EXPORT(89, png_voidp, png_get_user_chunk_ptr, (png_const_structp png_ptr));
 #endif

 #ifdef PNG_PROGRESSIVE_READ_SUPPORTED
@@ -1479,13 +1497,30 @@ PNG_EXPORT(90, void, png_set_progressive_read_fn, (png_structp png_ptr,
    png_progressive_row_ptr row_fn, png_progressive_end_ptr end_fn));

 /* Returns the user pointer associated with the push read functions */
-PNG_EXPORT(91, png_voidp, png_get_progressive_ptr, (png_structp png_ptr));
+PNG_EXPORT(91, png_voidp, png_get_progressive_ptr, (png_const_structp png_ptr));

 /* Function to be called when data becomes available */
 PNG_EXPORT(92, void, png_process_data,
    (png_structp png_ptr, png_infop info_ptr, 
    png_bytep buffer, png_size_t buffer_size));

+/* A function which may be called *only* within png_process_data to stop the
+ * processing of any more data.  The function returns the number of bytes
+ * remaining, excluding any that libpng has cached internally.  A subsequent
+ * call to png_process_data must supply these bytes again.  If the argument
+ * 'save' is set to true the routine will first save all the pending data and
+ * will always return 0.
+ */
+PNG_EXPORT(219, png_size_t, png_process_data_pause, (png_structp, int save));
+
+/* A function which may be called *only* outside (after) a call to
+ * png_process_data.  It returns the number of bytes of data to skip in the
+ * input.  Normally it will return 0, but if it returns a non-zero value the
+ * application must skip than number of bytes of input data and pass the
+ * following data to the next call to png_process_data.
+ */
+PNG_EXPORT(220, png_uint_32, png_process_data_skip, (png_structp));
+
 /* Function that combines rows.  'new_row' is a flag that should come from
 * the callback and be non-NULL if anything needs to be done; the library
 * stores its own version of the new data internally and ignores the passed
@@ -1605,92 +1640,92 @@ PNG_EXPORT(109, void, png_set_benign_errors,
 */
 /* Returns "flag" if chunk data is valid in info_ptr. */
 PNG_EXPORT(110, png_uint_32, png_get_valid,
-    (png_structp png_ptr, png_infop info_ptr, 
+    (png_const_structp png_ptr, png_const_infop info_ptr, 
    png_uint_32 flag));

 /* Returns number of bytes needed to hold a transformed row. */
-PNG_EXPORT(111, png_size_t, png_get_rowbytes, (png_structp png_ptr, 
-    png_infop info_ptr));
+PNG_EXPORT(111, png_size_t, png_get_rowbytes, (png_const_structp png_ptr, 
+    png_const_infop info_ptr));

 #ifdef PNG_INFO_IMAGE_SUPPORTED
 /* Returns row_pointers, which is an array of pointers to scanlines that was
 * returned from png_read_png().
 */
 PNG_EXPORT(112, png_bytepp, png_get_rows,
-    (png_structp png_ptr, png_infop info_ptr));
+    (png_const_structp png_ptr, png_const_infop info_ptr));
 /* Set row_pointers, which is an array of pointers to scanlines for use
 * by png_write_png().
 */
-PNG_EXPORT(113, void, png_set_rows, (png_structp png_ptr, png_infop info_ptr, 
-    png_bytepp row_pointers));
+PNG_EXPORT(113, void, png_set_rows, (png_structp png_ptr,
+    png_infop info_ptr, png_bytepp row_pointers));
 #endif

 /* Returns number of color channels in image. */
 PNG_EXPORT(114, png_byte, png_get_channels,
-    (png_structp png_ptr, png_infop info_ptr));
+    (png_const_structp png_ptr, png_const_infop info_ptr));

 #ifdef PNG_EASY_ACCESS_SUPPORTED
 /* Returns image width in pixels. */
-PNG_EXPORT(115, png_uint_32, png_get_image_width, (png_structp png_ptr, 
-    png_infop info_ptr));
+PNG_EXPORT(115, png_uint_32, png_get_image_width, (png_const_structp png_ptr, 
+    png_const_infop info_ptr));

 /* Returns image height in pixels. */
-PNG_EXPORT(116, png_uint_32, png_get_image_height, (png_structp png_ptr, 
-    png_infop info_ptr));
+PNG_EXPORT(116, png_uint_32, png_get_image_height, (png_const_structp png_ptr, 
+    png_const_infop info_ptr));

 /* Returns image bit_depth. */
 PNG_EXPORT(117, png_byte, png_get_bit_depth,
-    (png_structp png_ptr, png_infop info_ptr));
+    (png_const_structp png_ptr, png_const_infop info_ptr));

 /* Returns image color_type. */
-PNG_EXPORT(118, png_byte, png_get_color_type, (png_structp png_ptr, 
-    png_infop info_ptr));
+PNG_EXPORT(118, png_byte, png_get_color_type, (png_const_structp png_ptr, 
+    png_const_infop info_ptr));

 /* Returns image filter_type. */
-PNG_EXPORT(119, png_byte, png_get_filter_type, (png_structp png_ptr, 
-    png_infop info_ptr));
+PNG_EXPORT(119, png_byte, png_get_filter_type, (png_const_structp png_ptr, 
+    png_const_infop info_ptr));

 /* Returns image interlace_type. */
-PNG_EXPORT(120, png_byte, png_get_interlace_type, (png_structp png_ptr, 
-    png_infop info_ptr));
+PNG_EXPORT(120, png_byte, png_get_interlace_type, (png_const_structp png_ptr, 
+    png_const_infop info_ptr));

 /* Returns image compression_type. */
-PNG_EXPORT(121, png_byte, png_get_compression_type, (png_structp png_ptr, 
-    png_infop info_ptr));
+PNG_EXPORT(121, png_byte, png_get_compression_type, (png_const_structp png_ptr, 
+    png_const_infop info_ptr));

 /* Returns image resolution in pixels per meter, from pHYs chunk data. */
-PNG_EXPORT(122, png_uint_32, png_get_pixels_per_meter, (png_structp png_ptr, 
-    png_infop info_ptr));
-PNG_EXPORT(123, png_uint_32, png_get_x_pixels_per_meter, (png_structp png_ptr, 
-    png_infop info_ptr));
-PNG_EXPORT(124, png_uint_32, png_get_y_pixels_per_meter, (png_structp png_ptr, 
-    png_infop info_ptr));
+PNG_EXPORT(122, png_uint_32, png_get_pixels_per_meter,
+    (png_const_structp png_ptr, png_const_infop info_ptr));
+PNG_EXPORT(123, png_uint_32, png_get_x_pixels_per_meter,
+    (png_const_structp png_ptr, png_const_infop info_ptr));
+PNG_EXPORT(124, png_uint_32, png_get_y_pixels_per_meter,
+    (png_const_structp png_ptr, png_const_infop info_ptr));

 /* Returns pixel aspect ratio, computed from pHYs chunk data.  */
-PNG_FP_EXPORT(125, float, png_get_pixel_aspect_ratio, (png_structp png_ptr, 
-    png_infop info_ptr));
+PNG_FP_EXPORT(125, float, png_get_pixel_aspect_ratio,
+    (png_const_structp png_ptr, png_const_infop info_ptr));
 PNG_FIXED_EXPORT(210, png_fixed_point, png_get_pixel_aspect_ratio_fixed, 
-    (png_structp png_ptr, png_infop info_ptr));
+    (png_const_structp png_ptr, png_const_infop info_ptr));

 /* Returns image x, y offset in pixels or microns, from oFFs chunk data. */
-PNG_EXPORT(126, png_int_32, png_get_x_offset_pixels, (png_structp png_ptr, 
-    png_infop info_ptr));
-PNG_EXPORT(127, png_int_32, png_get_y_offset_pixels, (png_structp png_ptr, 
-    png_infop info_ptr));
-PNG_EXPORT(128, png_int_32, png_get_x_offset_microns, (png_structp png_ptr, 
-    png_infop info_ptr));
-PNG_EXPORT(129, png_int_32, png_get_y_offset_microns, (png_structp png_ptr, 
-    png_infop info_ptr));
+PNG_EXPORT(126, png_int_32, png_get_x_offset_pixels,
+    (png_const_structp png_ptr, png_const_infop info_ptr));
+PNG_EXPORT(127, png_int_32, png_get_y_offset_pixels,
+    (png_const_structp png_ptr, png_const_infop info_ptr));
+PNG_EXPORT(128, png_int_32, png_get_x_offset_microns,
+    (png_const_structp png_ptr, png_const_infop info_ptr));
+PNG_EXPORT(129, png_int_32, png_get_y_offset_microns,
+    (png_const_structp png_ptr, png_const_infop info_ptr));

 #endif /* PNG_EASY_ACCESS_SUPPORTED */

 /* Returns pointer to signature string read from PNG header */
-PNG_EXPORT(130, png_const_bytep, png_get_signature, (png_structp png_ptr, 
-    png_infop info_ptr));
+PNG_EXPORT(130, png_const_bytep, png_get_signature,
+    (png_const_structp png_ptr, png_infop info_ptr));

 #ifdef PNG_bKGD_SUPPORTED
 PNG_EXPORT(131, png_uint_32, png_get_bKGD,
-    (png_structp png_ptr, png_infop info_ptr, 
+    (png_const_structp png_ptr, png_infop info_ptr, 
    png_color_16p *background));
 #endif

@@ -1700,13 +1735,14 @@ PNG_EXPORT(132, void, png_set_bKGD, (png_structp png_ptr, png_infop info_ptr,
 #endif

 #ifdef PNG_cHRM_SUPPORTED
-PNG_FP_EXPORT(133, png_uint_32, png_get_cHRM, (png_structp png_ptr, 
-    png_infop info_ptr, double *white_x, double *white_y, double *red_x, 
+PNG_FP_EXPORT(133, png_uint_32, png_get_cHRM, (png_const_structp png_ptr, 
+   png_const_infop info_ptr, double *white_x, double *white_y, double *red_x, 
    double *red_y, double *green_x, double *green_y, double *blue_x, 
    double *blue_y));
 #ifdef PNG_FIXED_POINT_SUPPORTED /* Otherwise not implemented */
-PNG_FIXED_EXPORT(134, png_uint_32, png_get_cHRM_fixed, (png_structp png_ptr, 
-    png_infop info_ptr, png_fixed_point *int_white_x, 
+PNG_FIXED_EXPORT(134, png_uint_32, png_get_cHRM_fixed,
+    (png_const_structp png_ptr, 
+    png_const_infop info_ptr, png_fixed_point *int_white_x, 
    png_fixed_point *int_white_y, png_fixed_point *int_red_x, 
    png_fixed_point *int_red_y, png_fixed_point *int_green_x, 
    png_fixed_point *int_green_y, png_fixed_point *int_blue_x, 
@@ -1729,28 +1765,29 @@ PNG_FIXED_EXPORT(136, void, png_set_cHRM_fixed, (png_structp png_ptr,

 #ifdef PNG_gAMA_SUPPORTED
 PNG_FP_EXPORT(137, png_uint_32, png_get_gAMA,
-    (png_structp png_ptr, png_infop info_ptr, 
+    (png_const_structp png_ptr, png_const_infop info_ptr, 
    double *file_gamma));
-PNG_FIXED_EXPORT(138, png_uint_32, png_get_gAMA_fixed, (png_structp png_ptr, 
-    png_infop info_ptr, png_fixed_point *int_file_gamma));
+PNG_FIXED_EXPORT(138, png_uint_32, png_get_gAMA_fixed,
+    (png_const_structp png_ptr, png_const_infop info_ptr,
+    png_fixed_point *int_file_gamma));
 #endif

 #ifdef PNG_gAMA_SUPPORTED
-PNG_FP_EXPORT(139, void, png_set_gAMA, (png_structp png_ptr, png_infop info_ptr, 
-    double file_gamma));
+PNG_FP_EXPORT(139, void, png_set_gAMA, (png_structp png_ptr,
+    png_infop info_ptr, double file_gamma));
 PNG_FIXED_EXPORT(140, void, png_set_gAMA_fixed, (png_structp png_ptr, 
    png_infop info_ptr, png_fixed_point int_file_gamma));
 #endif

 #ifdef PNG_hIST_SUPPORTED
 PNG_EXPORT(141, png_uint_32, png_get_hIST,
-    (png_structp png_ptr, png_infop info_ptr, 
+    (png_const_structp png_ptr, png_const_infop info_ptr, 
    png_uint_16p *hist));
 #endif

 #ifdef PNG_hIST_SUPPORTED
-PNG_EXPORT(142, void, png_set_hIST, (png_structp png_ptr, png_infop info_ptr, 
-    png_const_uint_16p hist));
+PNG_EXPORT(142, void, png_set_hIST, (png_structp png_ptr,
+    png_infop info_ptr, png_const_uint_16p hist));
 #endif

 PNG_EXPORT(143, png_uint_32, png_get_IHDR,
@@ -1765,7 +1802,7 @@ PNG_EXPORT(144, void, png_set_IHDR,

 #ifdef PNG_oFFs_SUPPORTED
 PNG_EXPORT(145, png_uint_32, png_get_oFFs,
-    (png_structp png_ptr, png_infop info_ptr, 
+    (png_const_structp png_ptr, png_const_infop info_ptr, 
    png_int_32 *offset_x, png_int_32 *offset_y, int *unit_type));
 #endif

@@ -1777,21 +1814,22 @@ PNG_EXPORT(146, void, png_set_oFFs,

 #ifdef PNG_pCAL_SUPPORTED
 PNG_EXPORT(147, png_uint_32, png_get_pCAL,
-    (png_structp png_ptr, png_infop info_ptr, 
+    (png_const_structp png_ptr, png_const_infop info_ptr, 
    png_charp *purpose, png_int_32 *X0, png_int_32 *X1, int *type,
    int *nparams, 
    png_charp *units, png_charpp *params));
 #endif

 #ifdef PNG_pCAL_SUPPORTED
-PNG_EXPORT(148, void, png_set_pCAL, (png_structp png_ptr, png_infop info_ptr, 
+PNG_EXPORT(148, void, png_set_pCAL, (png_structp png_ptr,
+    png_infop info_ptr, 
    png_const_charp purpose, png_int_32 X0, png_int_32 X1, int type, 
    int nparams, png_const_charp units, png_charpp params));
 #endif

 #ifdef PNG_pHYs_SUPPORTED
 PNG_EXPORT(149, png_uint_32, png_get_pHYs,
-    (png_structp png_ptr, png_infop info_ptr, 
+    (png_const_structp png_ptr, png_const_infop info_ptr, 
    png_uint_32 *res_x, png_uint_32 *res_y, int *unit_type));
 #endif

@@ -1802,7 +1840,7 @@ PNG_EXPORT(150, void, png_set_pHYs,
 #endif

 PNG_EXPORT(151, png_uint_32, png_get_PLTE,
-    (png_structp png_ptr, png_infop info_ptr, 
+    (png_const_structp png_ptr, png_const_infop info_ptr, 
    png_colorp *palette, int *num_palette));

 PNG_EXPORT(152, void, png_set_PLTE,
@@ -1811,7 +1849,7 @@ PNG_EXPORT(152, void, png_set_PLTE,

 #ifdef PNG_sBIT_SUPPORTED
 PNG_EXPORT(153, png_uint_32, png_get_sBIT,
-    (png_structp png_ptr, png_infop info_ptr, 
+    (png_const_structp png_ptr, png_infop info_ptr, 
    png_color_8p *sig_bit));
 #endif

@@ -1821,20 +1859,20 @@ PNG_EXPORT(154, void, png_set_sBIT,
 #endif

 #ifdef PNG_sRGB_SUPPORTED
-PNG_EXPORT(155, png_uint_32, png_get_sRGB,
-    (png_structp png_ptr, png_infop info_ptr, int *intent));
+PNG_EXPORT(155, png_uint_32, png_get_sRGB, (png_const_structp png_ptr,
+    png_const_infop info_ptr, int *file_srgb_intent));
 #endif

 #ifdef PNG_sRGB_SUPPORTED
 PNG_EXPORT(156, void, png_set_sRGB,
-    (png_structp png_ptr, png_infop info_ptr, int intent));
+    (png_structp png_ptr, png_infop info_ptr, int srgb_intent));
 PNG_EXPORT(157, void, png_set_sRGB_gAMA_and_cHRM, (png_structp png_ptr, 
-    png_infop info_ptr, int intent));
+    png_infop info_ptr, int srgb_intent));
 #endif

 #ifdef PNG_iCCP_SUPPORTED
 PNG_EXPORT(158, png_uint_32, png_get_iCCP,
-    (png_structp png_ptr, png_infop info_ptr, 
+    (png_const_structp png_ptr, png_const_infop info_ptr, 
    png_charpp name, int *compression_type, png_bytepp profile, 
    png_uint_32 *proflen));
 #endif
@@ -1848,7 +1886,7 @@ PNG_EXPORT(159, void, png_set_iCCP,

 #ifdef PNG_sPLT_SUPPORTED
 PNG_EXPORT(160, png_uint_32, png_get_sPLT,
-    (png_structp png_ptr, png_infop info_ptr, 
+    (png_const_structp png_ptr, png_const_infop info_ptr, 
    png_sPLT_tpp entries));
 #endif

@@ -1861,7 +1899,7 @@ PNG_EXPORT(161, void, png_set_sPLT,
 #ifdef PNG_TEXT_SUPPORTED
 /* png_get_text also returns the number of text chunks in *num_text */
 PNG_EXPORT(162, png_uint_32, png_get_text,
-    (png_structp png_ptr, png_infop info_ptr, 
+    (png_const_structp png_ptr, png_const_infop info_ptr, 
    png_textp *text_ptr, int *num_text));
 #endif

@@ -1880,7 +1918,7 @@ PNG_EXPORT(163, void, png_set_text,

 #ifdef PNG_tIME_SUPPORTED
 PNG_EXPORT(164, png_uint_32, png_get_tIME,
-    (png_structp png_ptr, png_infop info_ptr, png_timep *mod_time));
+    (png_const_structp png_ptr, png_infop info_ptr, png_timep *mod_time));
 #endif

 #ifdef PNG_tIME_SUPPORTED
@@ -1890,7 +1928,7 @@ PNG_EXPORT(165, void, png_set_tIME,

 #ifdef PNG_tRNS_SUPPORTED
 PNG_EXPORT(166, png_uint_32, png_get_tRNS,
-    (png_structp png_ptr, png_infop info_ptr, 
+    (png_const_structp png_ptr, png_infop info_ptr, 
    png_bytep *trans_alpha, int *num_trans, png_color_16p *trans_color));
 #endif

@@ -1903,7 +1941,7 @@ PNG_EXPORT(167, void, png_set_tRNS,

 #ifdef PNG_sCAL_SUPPORTED
 PNG_FP_EXPORT(168, png_uint_32, png_get_sCAL,
-    (png_structp png_ptr, png_infop info_ptr, 
+    (png_const_structp png_ptr, png_const_infop info_ptr, 
    int *unit, double *width, double *height));
 #ifdef PNG_FLOATING_ARITHMETIC_SUPPORTED
 /* NOTE: this API is currently implemented using floating point arithmetic, 
@@ -1911,13 +1949,14 @@ PNG_FP_EXPORT(168, png_uint_32, png_get_sCAL,
 * In any case the range of values supported by png_fixed_point is small and it
 * is highly recommended that png_get_sCAL_s be used instead.
 */
-PNG_FIXED_EXPORT(214, png_uint_32, png_get_sCAL_fixed, (png_structp png_ptr, 
-    png_infop info_ptr, int *unit, png_fixed_point *width, 
+PNG_FIXED_EXPORT(214, png_uint_32, png_get_sCAL_fixed,
+    (png_structp png_ptr, png_const_infop info_ptr, int *unit,
+    png_fixed_point *width, 
    png_fixed_point *height));
 #endif
 PNG_EXPORT(169, png_uint_32, png_get_sCAL_s,
-    (png_structp png_ptr, 
-    png_infop info_ptr, int *unit, png_charpp swidth, png_charpp sheight));
+    (png_const_structp png_ptr, png_const_infop info_ptr,
+    int *unit, png_charpp swidth, png_charpp sheight));

 PNG_FP_EXPORT(170, void, png_set_sCAL,
    (png_structp png_ptr, png_infop info_ptr, 
@@ -1948,11 +1987,12 @@ PNG_EXPORT(173, int, png_handle_as_unknown, (png_structp png_ptr,
 #endif
 #ifdef PNG_UNKNOWN_CHUNKS_SUPPORTED
 PNG_EXPORT(174, void, png_set_unknown_chunks, (png_structp png_ptr, 
-    png_infop info_ptr, png_const_unknown_chunkp unknowns, int num_unknowns));
-PNG_EXPORT(175, void, png_set_unknown_chunk_location, (png_structp png_ptr, 
-    png_infop info_ptr, int chunk, int location));
-PNG_EXPORT(176, int, png_get_unknown_chunks, (png_structp png_ptr, 
-    png_infop info_ptr, png_unknown_chunkpp entries));
+    png_infop info_ptr, png_const_unknown_chunkp unknowns,
+    int num_unknowns));
+PNG_EXPORT(175, void, png_set_unknown_chunk_location,
+    (png_structp png_ptr, png_infop info_ptr, int chunk, int location));
+PNG_EXPORT(176, int, png_get_unknown_chunks, (png_const_structp png_ptr, 
+    png_const_infop info_ptr, png_unknown_chunkpp entries));
 #endif

 /* Png_free_data() will turn off the "valid" flag for anything it frees.
@@ -1970,10 +2010,14 @@ PNG_EXPORT(179, void, png_write_png, (png_structp png_ptr, png_infop info_ptr,
    int transforms, png_voidp params));
 #endif

-PNG_EXPORT(180, png_const_charp, png_get_copyright, (png_structp png_ptr));
-PNG_EXPORT(181, png_const_charp, png_get_header_ver, (png_structp png_ptr));
-PNG_EXPORT(182, png_const_charp, png_get_header_version, (png_structp png_ptr));
-PNG_EXPORT(183, png_const_charp, png_get_libpng_ver, (png_structp png_ptr));
+PNG_EXPORT(180, png_const_charp, png_get_copyright,
+    (png_const_structp png_ptr));
+PNG_EXPORT(181, png_const_charp, png_get_header_ver,
+    (png_const_structp png_ptr));
+PNG_EXPORT(182, png_const_charp, png_get_header_version,
+    (png_const_structp png_ptr));
+PNG_EXPORT(183, png_const_charp, png_get_libpng_ver,
+    (png_const_structp png_ptr));

 #ifdef PNG_MNG_FEATURES_SUPPORTED
 PNG_EXPORT(184, png_uint_32, png_permit_mng_features, (png_structp png_ptr, 
@@ -1999,46 +2043,49 @@ PNG_EXPORT(185, void, png_set_strip_error_numbers,
 #ifdef PNG_SET_USER_LIMITS_SUPPORTED
 PNG_EXPORT(186, void, png_set_user_limits, (png_structp png_ptr, 
    png_uint_32 user_width_max, png_uint_32 user_height_max));
-PNG_EXPORT(187, png_uint_32, png_get_user_width_max, (png_structp png_ptr));
-PNG_EXPORT(188, png_uint_32, png_get_user_height_max, (png_structp png_ptr));
+PNG_EXPORT(187, png_uint_32, png_get_user_width_max,
+    (png_const_structp png_ptr));
+PNG_EXPORT(188, png_uint_32, png_get_user_height_max,
+    (png_const_structp png_ptr));
 /* Added in libpng-1.4.0 */
 PNG_EXPORT(189, void, png_set_chunk_cache_max, (png_structp png_ptr, 
    png_uint_32 user_chunk_cache_max));
-PNG_EXPORT(190, png_uint_32, png_get_chunk_cache_max, (png_structp png_ptr));
+PNG_EXPORT(190, png_uint_32, png_get_chunk_cache_max,
+    (png_const_structp png_ptr));
 /* Added in libpng-1.4.1 */
 PNG_EXPORT(191, void, png_set_chunk_malloc_max, (png_structp png_ptr, 
    png_alloc_size_t user_chunk_cache_max));
 PNG_EXPORT(192, png_alloc_size_t, png_get_chunk_malloc_max,
-    (png_structp png_ptr));
+    (png_const_structp png_ptr));
 #endif

 #if defined(PNG_INCH_CONVERSIONS_SUPPORTED)
-PNG_EXPORT(193, png_uint_32, png_get_pixels_per_inch, (png_structp png_ptr, 
-    png_infop info_ptr));
+PNG_EXPORT(193, png_uint_32, png_get_pixels_per_inch,
+    (png_const_structp png_ptr, png_const_infop info_ptr));

-PNG_EXPORT(194, png_uint_32, png_get_x_pixels_per_inch, (png_structp png_ptr, 
-    png_infop info_ptr));
+PNG_EXPORT(194, png_uint_32, png_get_x_pixels_per_inch,
+    (png_const_structp png_ptr, png_const_infop info_ptr));

-PNG_EXPORT(195, png_uint_32, png_get_y_pixels_per_inch, (png_structp png_ptr, 
-    png_infop info_ptr));
+PNG_EXPORT(195, png_uint_32, png_get_y_pixels_per_inch,
+    (png_const_structp png_ptr, png_const_infop info_ptr));

-PNG_FP_EXPORT(196, float, png_get_x_offset_inches, (png_structp png_ptr, 
-    png_infop info_ptr));
+PNG_FP_EXPORT(196, float, png_get_x_offset_inches,
+    (png_const_structp png_ptr, png_const_infop info_ptr));
 #ifdef PNG_FIXED_POINT_SUPPORTED /* otherwise not implemented. */
 PNG_FIXED_EXPORT(211, png_fixed_point, png_get_x_offset_inches_fixed, 
-    (png_structp png_ptr, png_infop info_ptr));
+    (png_structp png_ptr, png_const_infop info_ptr));
 #endif

-PNG_FP_EXPORT(197, float, png_get_y_offset_inches, (png_structp png_ptr, 
-    png_infop info_ptr));
+PNG_FP_EXPORT(197, float, png_get_y_offset_inches, (png_const_structp png_ptr, 
+    png_const_infop info_ptr));
 #ifdef PNG_FIXED_POINT_SUPPORTED /* otherwise not implemented. */
 PNG_FIXED_EXPORT(212, png_fixed_point, png_get_y_offset_inches_fixed, 
-    (png_structp png_ptr, png_infop info_ptr));
+    (png_structp png_ptr, png_const_infop info_ptr));
 #endif

 #  ifdef PNG_pHYs_SUPPORTED
-PNG_EXPORT(198, png_uint_32, png_get_pHYs_dpi, (png_structp png_ptr, 
-    png_infop info_ptr, png_uint_32 *res_x, png_uint_32 *res_y,
+PNG_EXPORT(198, png_uint_32, png_get_pHYs_dpi, (png_const_structp png_ptr, 
+    png_const_infop info_ptr, png_uint_32 *res_x, png_uint_32 *res_y,
    int *unit_type));
 #  endif /* PNG_pHYs_SUPPORTED */
 #endif  /* PNG_INCH_CONVERSIONS_SUPPORTED */
@@ -2047,7 +2094,10 @@ PNG_EXPORT(198, png_uint_32, png_get_pHYs_dpi, (png_structp png_ptr,
 #ifdef PNG_IO_STATE_SUPPORTED
 PNG_EXPORT(199, png_uint_32, png_get_io_state, (png_structp png_ptr));

-PNG_EXPORT(200, png_const_bytep, png_get_io_chunk_name, (png_structp png_ptr));
+PNG_EXPORTA(200, png_const_bytep, png_get_io_chunk_name,
+    (png_structp png_ptr), PNG_DEPRECATED);
+PNG_EXPORT(216, png_uint_32, png_get_io_chunk_type,
+    (png_const_structp png_ptr));

 /* The flags returned by png_get_io_state() are the following: */
 #  define PNG_IO_NONE        0x0000   /* no I/O at this moment */
@@ -2156,31 +2206,6 @@ PNG_EXPORT(200, png_const_bytep, png_get_io_chunk_name, (png_structp png_ptr));
     (png_uint_32)32767) / (png_uint_32)65535L)
 #endif /* PNG_READ_COMPOSITE_NODIV_SUPPORTED */

-#ifdef PNG_USE_READ_MACROS
-/* Inline macros to do direct reads of bytes from the input buffer.
- * The png_get_int_32() routine assumes we are using two's complement
- * format for negative values, which is almost certainly true.
- */
-#  define png_get_uint_32(buf) \
-     (((png_uint_32)(*(buf)) << 24) + \
-      ((png_uint_32)(*((buf) + 1)) << 16) + \
-      ((png_uint_32)(*((buf) + 2)) << 8) + \
-      ((png_uint_32)(*((buf) + 3))))
-
-   /* From libpng-1.4.0 until 1.4.4, the png_get_uint_16 macro (but not the
-    * function) incorrectly returned a value of type png_uint_32.
-    */
-#  define png_get_uint_16(buf) \
-     ((png_uint_16) \
-      (((unsigned int)(*(buf)) << 8) + \
-       ((unsigned int)(*((buf) + 1)))))
-
-#  define png_get_int_32(buf) \
-     ((png_int_32)((*(buf) & 0x80) \
-      ? -((png_int_32)((png_get_uint_32(buf) ^ 0xffffffffL) + 1)) \
-      : (png_int_32)png_get_uint_32(buf)))
-#endif
-
 #ifdef PNG_READ_INT_FUNCTIONS_SUPPORTED
 PNG_EXPORT(201, png_uint_32, png_get_uint_32, (png_const_bytep buf));
 PNG_EXPORT(202, png_uint_16, png_get_uint_16, (png_const_bytep buf));
@@ -2208,15 +2233,41 @@ PNG_EXPORT(207, void, png_save_uint_16, (png_bytep buf, unsigned int i));
 /* No png_save_int_16 -- may be added if there's a real need for it. */
 #endif

+#ifdef PNG_USE_READ_MACROS
+/* Inline macros to do direct reads of bytes from the input buffer.
+ * The png_get_int_32() routine assumes we are using two's complement
+ * format for negative values, which is almost certainly true.
+ */
+#  define png_get_uint_32(buf) \
+     (((png_uint_32)(*(buf)) << 24) + \
+      ((png_uint_32)(*((buf) + 1)) << 16) + \
+      ((png_uint_32)(*((buf) + 2)) << 8) + \
+      ((png_uint_32)(*((buf) + 3))))
+
+   /* From libpng-1.4.0 until 1.4.4, the png_get_uint_16 macro (but not the
+    * function) incorrectly returned a value of type png_uint_32.
+    */
+#  define png_get_uint_16(buf) \
+     ((png_uint_16) \
+      (((unsigned int)(*(buf)) << 8) + \
+       ((unsigned int)(*((buf) + 1)))))
+
+#  define png_get_int_32(buf) \
+     ((png_int_32)((*(buf) & 0x80) \
+      ? -((png_int_32)((png_get_uint_32(buf) ^ 0xffffffffL) + 1)) \
+      : (png_int_32)png_get_uint_32(buf)))
+#endif
+
 /* Maintainer: Put new public prototypes here ^, in libpng.3, and project
 * defs
 */

 /* The last ordinal number (this is the *last* one already used; the next
- * one to use is one more than this.)
+ * one to use is one more than this.)  Maintainer, remember to add an entry to
+ * scripts/symbols.def as well.
 */
 #ifdef PNG_EXPORT_LAST_ORDINAL
-  PNG_EXPORT_LAST_ORDINAL(215);
+  PNG_EXPORT_LAST_ORDINAL(220);
 #endif

 #ifdef __cplusplus
--- a/pngconf.h
+++ b/pngconf.h
@@ -1,7 +1,7 @@

 /* pngconf.h - machine configurable file for libpng
 *
- * libpng version 1.5.1beta06 - (PENDING RELEASE)
+ * libpng version 1.5.1beta11 - (PENDING RELEASE)
 *
 * 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 1.5.0 [January 6, 2011]
+ * Last changed in libpng 1.5.1 [(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.)
@@ -423,7 +423,7 @@ png_set_error_fn(png_structp png_ptr, png_voidp error_ptr,
 * pointer before png_write_destroy and png_read_destroy are called.
 */
 png_voidp PNGAPI
-png_get_error_ptr(png_structp png_ptr)
+png_get_error_ptr(png_const_structp png_ptr)
 {
   if (png_ptr == NULL)
      return NULL;
--- a/pngget.c
+++ b/pngget.c
@@ -1,7 +1,7 @@

 /* pngget.c - retrieval of values from info struct
 *
- * Last changed in libpng 1.5.0 [January 6, 2011]
+ * Last changed in libpng 1.5.1 [(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.)
@@ -17,7 +17,8 @@
 #if defined(PNG_READ_SUPPORTED) || defined(PNG_WRITE_SUPPORTED)

 png_uint_32 PNGAPI
-png_get_valid(png_structp png_ptr, png_infop info_ptr, png_uint_32 flag)
+png_get_valid(png_const_structp png_ptr, png_const_infop info_ptr,
+    png_uint_32 flag)
 {
   if (png_ptr != NULL && info_ptr != NULL)
      return(info_ptr->valid & flag);
@@ -26,7 +27,7 @@ png_get_valid(png_structp png_ptr, png_infop info_ptr, png_uint_32 flag)
 }

 png_size_t PNGAPI
-png_get_rowbytes(png_structp png_ptr, png_infop info_ptr)
+png_get_rowbytes(png_const_structp png_ptr, png_const_infop info_ptr)
 {
   if (png_ptr != NULL && info_ptr != NULL)
      return(info_ptr->rowbytes);
@@ -36,7 +37,7 @@ png_get_rowbytes(png_structp png_ptr, png_infop info_ptr)

 #ifdef PNG_INFO_IMAGE_SUPPORTED
 png_bytepp PNGAPI
-png_get_rows(png_structp png_ptr, png_infop info_ptr)
+png_get_rows(png_const_structp png_ptr, png_const_infop info_ptr)
 {
   if (png_ptr != NULL && info_ptr != NULL)
      return(info_ptr->row_pointers);
@@ -48,7 +49,7 @@ png_get_rows(png_structp png_ptr, png_infop info_ptr)
 #ifdef PNG_EASY_ACCESS_SUPPORTED
 /* Easy access to info, added in libpng-0.99 */
 png_uint_32 PNGAPI
-png_get_image_width(png_structp png_ptr, png_infop info_ptr)
+png_get_image_width(png_const_structp png_ptr, png_const_infop info_ptr)
 {
   if (png_ptr != NULL && info_ptr != NULL)
      return info_ptr->width;
@@ -57,7 +58,7 @@ png_get_image_width(png_structp png_ptr, png_infop info_ptr)
 }

 png_uint_32 PNGAPI
-png_get_image_height(png_structp png_ptr, png_infop info_ptr)
+png_get_image_height(png_const_structp png_ptr, png_const_infop info_ptr)
 {
   if (png_ptr != NULL && info_ptr != NULL)
      return info_ptr->height;
@@ -66,7 +67,7 @@ png_get_image_height(png_structp png_ptr, png_infop info_ptr)
 }

 png_byte PNGAPI
-png_get_bit_depth(png_structp png_ptr, png_infop info_ptr)
+png_get_bit_depth(png_const_structp png_ptr, png_const_infop info_ptr)
 {
   if (png_ptr != NULL && info_ptr != NULL)
      return info_ptr->bit_depth;
@@ -75,7 +76,7 @@ png_get_bit_depth(png_structp png_ptr, png_infop info_ptr)
 }

 png_byte PNGAPI
-png_get_color_type(png_structp png_ptr, png_infop info_ptr)
+png_get_color_type(png_const_structp png_ptr, png_const_infop info_ptr)
 {
   if (png_ptr != NULL && info_ptr != NULL)
      return info_ptr->color_type;
@@ -84,7 +85,7 @@ png_get_color_type(png_structp png_ptr, png_infop info_ptr)
 }

 png_byte PNGAPI
-png_get_filter_type(png_structp png_ptr, png_infop info_ptr)
+png_get_filter_type(png_const_structp png_ptr, png_const_infop info_ptr)
 {
   if (png_ptr != NULL && info_ptr != NULL)
      return info_ptr->filter_type;
@@ -93,7 +94,7 @@ png_get_filter_type(png_structp png_ptr, png_infop info_ptr)
 }

 png_byte PNGAPI
-png_get_interlace_type(png_structp png_ptr, png_infop info_ptr)
+png_get_interlace_type(png_const_structp png_ptr, png_const_infop info_ptr)
 {
   if (png_ptr != NULL && info_ptr != NULL)
      return info_ptr->interlace_type;
@@ -102,7 +103,7 @@ png_get_interlace_type(png_structp png_ptr, png_infop info_ptr)
 }

 png_byte PNGAPI
-png_get_compression_type(png_structp png_ptr, png_infop info_ptr)
+png_get_compression_type(png_const_structp png_ptr, png_const_infop info_ptr)
 {
   if (png_ptr != NULL && info_ptr != NULL)
      return info_ptr->compression_type;
@@ -111,7 +112,7 @@ png_get_compression_type(png_structp png_ptr, png_infop info_ptr)
 }

 png_uint_32 PNGAPI
-png_get_x_pixels_per_meter(png_structp png_ptr, png_infop info_ptr)
+png_get_x_pixels_per_meter(png_const_structp png_ptr, png_const_infop info_ptr)
 {
 #ifdef PNG_pHYs_SUPPORTED
   if (png_ptr != NULL && info_ptr != NULL && (info_ptr->valid & PNG_INFO_pHYs))
@@ -128,7 +129,7 @@ png_get_x_pixels_per_meter(png_structp png_ptr, png_infop info_ptr)
 }

 png_uint_32 PNGAPI
-png_get_y_pixels_per_meter(png_structp png_ptr, png_infop info_ptr)
+png_get_y_pixels_per_meter(png_const_structp png_ptr, png_const_infop info_ptr)
 {
 #ifdef PNG_pHYs_SUPPORTED
   if (png_ptr != NULL && info_ptr != NULL && (info_ptr->valid & PNG_INFO_pHYs))
@@ -145,7 +146,7 @@ png_get_y_pixels_per_meter(png_structp png_ptr, png_infop info_ptr)
 }

 png_uint_32 PNGAPI
-png_get_pixels_per_meter(png_structp png_ptr, png_infop info_ptr)
+png_get_pixels_per_meter(png_const_structp png_ptr, png_const_infop info_ptr)
 {
 #ifdef PNG_pHYs_SUPPORTED
   if (png_ptr != NULL && info_ptr != NULL && (info_ptr->valid & PNG_INFO_pHYs))
@@ -163,7 +164,7 @@ png_get_pixels_per_meter(png_structp png_ptr, png_infop info_ptr)

 #ifdef PNG_FLOATING_POINT_SUPPORTED
 float PNGAPI
-png_get_pixel_aspect_ratio(png_structp png_ptr, png_infop info_ptr)
+png_get_pixel_aspect_ratio(png_const_structp png_ptr, png_const_infop info_ptr)
 {
 #ifdef PNG_READ_pHYs_SUPPORTED
   if (png_ptr != NULL && info_ptr != NULL && (info_ptr->valid & PNG_INFO_pHYs))
@@ -182,7 +183,8 @@ png_get_pixel_aspect_ratio(png_structp png_ptr, png_infop info_ptr)

 #ifdef PNG_FIXED_POINT_SUPPORTED
 png_fixed_point PNGAPI
-png_get_pixel_aspect_ratio_fixed(png_structp png_ptr, png_infop info_ptr)
+png_get_pixel_aspect_ratio_fixed(png_const_structp png_ptr,
+    png_const_infop info_ptr)
 {
 #ifdef PNG_READ_pHYs_SUPPORTED
   if (png_ptr != NULL && info_ptr != NULL && (info_ptr->valid & PNG_INFO_pHYs)
@@ -208,7 +210,7 @@ png_get_pixel_aspect_ratio_fixed(png_structp png_ptr, png_infop info_ptr)
 #endif

 png_int_32 PNGAPI
-png_get_x_offset_microns(png_structp png_ptr, png_infop info_ptr)
+png_get_x_offset_microns(png_const_structp png_ptr, png_const_infop info_ptr)
 {
 #ifdef PNG_oFFs_SUPPORTED
   if (png_ptr != NULL && info_ptr != NULL && (info_ptr->valid & PNG_INFO_oFFs))
@@ -224,7 +226,7 @@ png_get_x_offset_microns(png_structp png_ptr, png_infop info_ptr)
 }

 png_int_32 PNGAPI
-png_get_y_offset_microns(png_structp png_ptr, png_infop info_ptr)
+png_get_y_offset_microns(png_const_structp png_ptr, png_const_infop info_ptr)
 {
 #ifdef PNG_oFFs_SUPPORTED
   if (png_ptr != NULL && info_ptr != NULL && (info_ptr->valid & PNG_INFO_oFFs))
@@ -240,7 +242,7 @@ png_get_y_offset_microns(png_structp png_ptr, png_infop info_ptr)
 }

 png_int_32 PNGAPI
-png_get_x_offset_pixels(png_structp png_ptr, png_infop info_ptr)
+png_get_x_offset_pixels(png_const_structp png_ptr, png_const_infop info_ptr)
 {
 #ifdef PNG_oFFs_SUPPORTED
   if (png_ptr != NULL && info_ptr != NULL && (info_ptr->valid & PNG_INFO_oFFs))
@@ -256,7 +258,7 @@ png_get_x_offset_pixels(png_structp png_ptr, png_infop info_ptr)
 }

 png_int_32 PNGAPI
-png_get_y_offset_pixels(png_structp png_ptr, png_infop info_ptr)
+png_get_y_offset_pixels(png_const_structp png_ptr, png_const_infop info_ptr)
 {
 #ifdef PNG_oFFs_SUPPORTED
   if (png_ptr != NULL && info_ptr != NULL && (info_ptr->valid & PNG_INFO_oFFs))
@@ -305,19 +307,19 @@ ppi_from_ppm(png_uint_32 ppm)
 }

 png_uint_32 PNGAPI
-png_get_pixels_per_inch(png_structp png_ptr, png_infop info_ptr)
+png_get_pixels_per_inch(png_const_structp png_ptr, png_const_infop info_ptr)
 {
   return ppi_from_ppm(png_get_pixels_per_meter(png_ptr, info_ptr));
 }

 png_uint_32 PNGAPI
-png_get_x_pixels_per_inch(png_structp png_ptr, png_infop info_ptr)
+png_get_x_pixels_per_inch(png_const_structp png_ptr, png_const_infop info_ptr)
 {
   return ppi_from_ppm(png_get_x_pixels_per_meter(png_ptr, info_ptr));
 }

 png_uint_32 PNGAPI
-png_get_y_pixels_per_inch(png_structp png_ptr, png_infop info_ptr)
+png_get_y_pixels_per_inch(png_const_structp png_ptr, png_const_infop info_ptr)
 {
   return ppi_from_ppm(png_get_y_pixels_per_meter(png_ptr, info_ptr));
 }
@@ -335,7 +337,8 @@ png_fixed_inches_from_microns(png_structp png_ptr, png_int_32 microns)
 }

 png_fixed_point PNGAPI
-png_get_x_offset_inches_fixed(png_structp png_ptr, png_infop info_ptr)
+png_get_x_offset_inches_fixed(png_structp png_ptr,
+    png_const_infop info_ptr)
 {
   return png_fixed_inches_from_microns(png_ptr,
       png_get_x_offset_microns(png_ptr, info_ptr));
@@ -344,7 +347,8 @@ png_get_x_offset_inches_fixed(png_structp png_ptr, png_infop info_ptr)

 #ifdef PNG_FIXED_POINT_SUPPORTED
 png_fixed_point PNGAPI
-png_get_y_offset_inches_fixed(png_structp png_ptr, png_infop info_ptr)
+png_get_y_offset_inches_fixed(png_structp png_ptr,
+    png_const_infop info_ptr)
 {
   return png_fixed_inches_from_microns(png_ptr,
       png_get_y_offset_microns(png_ptr, info_ptr));
@@ -353,7 +357,7 @@ png_get_y_offset_inches_fixed(png_structp png_ptr, png_infop info_ptr)

 #ifdef PNG_FLOATING_POINT_SUPPORTED
 float PNGAPI
-png_get_x_offset_inches(png_structp png_ptr, png_infop info_ptr)
+png_get_x_offset_inches(png_const_structp png_ptr, png_const_infop info_ptr)
 {
   /* To avoid the overflow do the conversion directly in floating
    * point.
@@ -364,7 +368,7 @@ png_get_x_offset_inches(png_structp png_ptr, png_infop info_ptr)

 #ifdef PNG_FLOATING_POINT_SUPPORTED
 float PNGAPI
-png_get_y_offset_inches(png_structp png_ptr, png_infop info_ptr)
+png_get_y_offset_inches(png_const_structp png_ptr, png_const_infop info_ptr)
 {
   /* To avoid the overflow do the conversion directly in floating
    * point.
@@ -375,7 +379,7 @@ png_get_y_offset_inches(png_structp png_ptr, png_infop info_ptr)

 #ifdef PNG_pHYs_SUPPORTED
 png_uint_32 PNGAPI
-png_get_pHYs_dpi(png_structp png_ptr, png_infop info_ptr,
+png_get_pHYs_dpi(png_const_structp png_ptr, png_const_infop info_ptr,
    png_uint_32 *res_x, png_uint_32 *res_y, int *unit_type)
 {
   png_uint_32 retval = 0;
@@ -419,7 +423,7 @@ png_get_pHYs_dpi(png_structp png_ptr, png_infop info_ptr,
 #endif  /* PNG_EASY_ACCESS_SUPPORTED */

 png_byte PNGAPI
-png_get_channels(png_structp png_ptr, png_infop info_ptr)
+png_get_channels(png_const_structp png_ptr, png_const_infop info_ptr)
 {
   if (png_ptr != NULL && info_ptr != NULL)
      return(info_ptr->channels);
@@ -428,7 +432,7 @@ png_get_channels(png_structp png_ptr, png_infop info_ptr)
 }

 png_const_bytep PNGAPI
-png_get_signature(png_structp png_ptr, png_infop info_ptr)
+png_get_signature(png_const_structp png_ptr, png_infop info_ptr)
 {
   if (png_ptr != NULL && info_ptr != NULL)
      return(info_ptr->signature);
@@ -438,7 +442,7 @@ png_get_signature(png_structp png_ptr, png_infop info_ptr)

 #ifdef PNG_bKGD_SUPPORTED
 png_uint_32 PNGAPI
-png_get_bKGD(png_structp png_ptr, png_infop info_ptr,
+png_get_bKGD(png_const_structp png_ptr, png_infop info_ptr,
   png_color_16p *background)
 {
   if (png_ptr != NULL && info_ptr != NULL && (info_ptr->valid & PNG_INFO_bKGD)
@@ -457,7 +461,7 @@ png_get_bKGD(png_structp png_ptr, png_infop info_ptr,
 #ifdef PNG_cHRM_SUPPORTED
 #  ifdef PNG_FLOATING_POINT_SUPPORTED
 png_uint_32 PNGAPI
-png_get_cHRM(png_structp png_ptr, png_infop info_ptr,
+png_get_cHRM(png_const_structp png_ptr, png_const_infop info_ptr,
    double *white_x, double *white_y, double *red_x, double *red_y,
    double *green_x, double *green_y, double *blue_x, double *blue_y)
 {
@@ -490,7 +494,7 @@ png_get_cHRM(png_structp png_ptr, png_infop info_ptr,

 #  ifdef PNG_FIXED_POINT_SUPPORTED
 png_uint_32 PNGAPI
-png_get_cHRM_fixed(png_structp png_ptr, png_infop info_ptr,
+png_get_cHRM_fixed(png_const_structp png_ptr, png_const_infop info_ptr,
    png_fixed_point *white_x, png_fixed_point *white_y, png_fixed_point *red_x,
    png_fixed_point *red_y, png_fixed_point *green_x, png_fixed_point *green_y,
    png_fixed_point *blue_x, png_fixed_point *blue_y)
@@ -525,7 +529,7 @@ png_get_cHRM_fixed(png_structp png_ptr, png_infop info_ptr,

 #ifdef PNG_gAMA_SUPPORTED
 png_uint_32 PNGFAPI
-png_get_gAMA_fixed(png_structp png_ptr, png_infop info_ptr,
+png_get_gAMA_fixed(png_const_structp png_ptr, png_const_infop info_ptr,
    png_fixed_point *file_gamma)
 {
   png_debug1(1, "in %s retrieval function", "gAMA");
@@ -541,7 +545,8 @@ png_get_gAMA_fixed(png_structp png_ptr, png_infop info_ptr,
 }
 #  ifdef PNG_FLOATING_POINT_SUPPORTED
 png_uint_32 PNGAPI
-png_get_gAMA(png_structp png_ptr, png_infop info_ptr, double *file_gamma)
+png_get_gAMA(png_const_structp png_ptr, png_const_infop info_ptr,
+    double *file_gamma)
 {
   png_fixed_point igamma;
   png_uint_32 ok = png_get_gAMA_fixed(png_ptr, info_ptr, &igamma);
@@ -557,7 +562,8 @@ png_get_gAMA(png_structp png_ptr, png_infop info_ptr, double *file_gamma)

 #ifdef PNG_sRGB_SUPPORTED
 png_uint_32 PNGAPI
-png_get_sRGB(png_structp png_ptr, png_infop info_ptr, int *file_srgb_intent)
+png_get_sRGB(png_const_structp png_ptr, png_const_infop info_ptr,
+    int *file_srgb_intent)
 {
   png_debug1(1, "in %s retrieval function", "sRGB");

@@ -574,7 +580,7 @@ png_get_sRGB(png_structp png_ptr, png_infop info_ptr, int *file_srgb_intent)

 #ifdef PNG_iCCP_SUPPORTED
 png_uint_32 PNGAPI
-png_get_iCCP(png_structp png_ptr, png_infop info_ptr,
+png_get_iCCP(png_const_structp png_ptr, png_const_infop info_ptr,
    png_charpp name, int *compression_type,
    png_bytepp profile, png_uint_32 *proflen)
 {
@@ -599,7 +605,7 @@ png_get_iCCP(png_structp png_ptr, png_infop info_ptr,

 #ifdef PNG_sPLT_SUPPORTED
 png_uint_32 PNGAPI
-png_get_sPLT(png_structp png_ptr, png_infop info_ptr,
+png_get_sPLT(png_const_structp png_ptr, png_const_infop info_ptr,
    png_sPLT_tpp spalettes)
 {
   if (png_ptr != NULL && info_ptr != NULL && spalettes != NULL)
@@ -614,7 +620,8 @@ png_get_sPLT(png_structp png_ptr, png_infop info_ptr,

 #ifdef PNG_hIST_SUPPORTED
 png_uint_32 PNGAPI
-png_get_hIST(png_structp png_ptr, png_infop info_ptr, png_uint_16p *hist)
+png_get_hIST(png_const_structp png_ptr, png_const_infop info_ptr,
+    png_uint_16p *hist)
 {
   png_debug1(1, "in %s retrieval function", "hIST");

@@ -670,7 +677,7 @@ png_get_IHDR(png_structp png_ptr, png_infop info_ptr,

 #ifdef PNG_oFFs_SUPPORTED
 png_uint_32 PNGAPI
-png_get_oFFs(png_structp png_ptr, png_infop info_ptr,
+png_get_oFFs(png_const_structp png_ptr, png_const_infop info_ptr,
    png_int_32 *offset_x, png_int_32 *offset_y, int *unit_type)
 {
   png_debug1(1, "in %s retrieval function", "oFFs");
@@ -690,7 +697,7 @@ png_get_oFFs(png_structp png_ptr, png_infop info_ptr,

 #ifdef PNG_pCAL_SUPPORTED
 png_uint_32 PNGAPI
-png_get_pCAL(png_structp png_ptr, png_infop info_ptr,
+png_get_pCAL(png_const_structp png_ptr, png_const_infop info_ptr,
    png_charp *purpose, png_int_32 *X0, png_int_32 *X1, int *type, int *nparams,
    png_charp *units, png_charpp *params)
 {
@@ -718,7 +725,7 @@ png_get_pCAL(png_structp png_ptr, png_infop info_ptr,
 #  ifdef PNG_FIXED_POINT_SUPPORTED
 #    ifdef PNG_FLOATING_ARITHMETIC_SUPPORTED
 png_uint_32 PNGAPI
-png_get_sCAL_fixed(png_structp png_ptr, png_infop info_ptr,
+png_get_sCAL_fixed(png_structp png_ptr, png_const_infop info_ptr,
    int *unit, png_fixed_point *width, png_fixed_point *height)
 {
   if (png_ptr != NULL && info_ptr != NULL &&
@@ -738,7 +745,7 @@ png_get_sCAL_fixed(png_structp png_ptr, png_infop info_ptr,
 #  endif /* FIXED_POINT */
 #  ifdef PNG_FLOATING_POINT_SUPPORTED
 png_uint_32 PNGAPI
-png_get_sCAL(png_structp png_ptr, png_infop info_ptr,
+png_get_sCAL(png_const_structp png_ptr, png_const_infop info_ptr,
    int *unit, double *width, double *height)
 {
   if (png_ptr != NULL && info_ptr != NULL &&
@@ -754,7 +761,7 @@ png_get_sCAL(png_structp png_ptr, png_infop info_ptr,
 }
 #  endif /* FLOATING POINT */
 png_uint_32 PNGAPI
-png_get_sCAL_s(png_structp png_ptr, png_infop info_ptr,
+png_get_sCAL_s(png_const_structp png_ptr, png_const_infop info_ptr,
    int *unit, png_charpp width, png_charpp height)
 {
   if (png_ptr != NULL && info_ptr != NULL &&
@@ -772,7 +779,7 @@ png_get_sCAL_s(png_structp png_ptr, png_infop info_ptr,

 #ifdef PNG_pHYs_SUPPORTED
 png_uint_32 PNGAPI
-png_get_pHYs(png_structp png_ptr, png_infop info_ptr,
+png_get_pHYs(png_const_structp png_ptr, png_const_infop info_ptr,
    png_uint_32 *res_x, png_uint_32 *res_y, int *unit_type)
 {
   png_uint_32 retval = 0;
@@ -806,8 +813,8 @@ png_get_pHYs(png_structp png_ptr, png_infop info_ptr,
 #endif /* pHYs */

 png_uint_32 PNGAPI
-png_get_PLTE(png_structp png_ptr, png_infop info_ptr, png_colorp *palette,
-    int *num_palette)
+png_get_PLTE(png_const_structp png_ptr, png_const_infop info_ptr,
+    png_colorp *palette, int *num_palette)
 {
   png_debug1(1, "in %s retrieval function", "PLTE");

@@ -825,7 +832,8 @@ png_get_PLTE(png_structp png_ptr, png_infop info_ptr, png_colorp *palette,

 #ifdef PNG_sBIT_SUPPORTED
 png_uint_32 PNGAPI
-png_get_sBIT(png_structp png_ptr, png_infop info_ptr, png_color_8p *sig_bit)
+png_get_sBIT(png_const_structp png_ptr, png_infop info_ptr,
+    png_color_8p *sig_bit)
 {
   png_debug1(1, "in %s retrieval function", "sBIT");

@@ -842,8 +850,8 @@ png_get_sBIT(png_structp png_ptr, png_infop info_ptr, png_color_8p *sig_bit)

 #ifdef PNG_TEXT_SUPPORTED
 png_uint_32 PNGAPI
-png_get_text(png_structp png_ptr, png_infop info_ptr, png_textp *text_ptr,
-    int *num_text)
+png_get_text(png_const_structp png_ptr, png_const_infop info_ptr,
+    png_textp *text_ptr, int *num_text)
 {
   if (png_ptr != NULL && info_ptr != NULL && info_ptr->num_text > 0)
   {
@@ -869,7 +877,7 @@ png_get_text(png_structp png_ptr, png_infop info_ptr, png_textp *text_ptr,

 #ifdef PNG_tIME_SUPPORTED
 png_uint_32 PNGAPI
-png_get_tIME(png_structp png_ptr, png_infop info_ptr, png_timep *mod_time)
+png_get_tIME(png_const_structp png_ptr, png_infop info_ptr, png_timep *mod_time)
 {
   png_debug1(1, "in %s retrieval function", "tIME");

@@ -886,7 +894,7 @@ png_get_tIME(png_structp png_ptr, png_infop info_ptr, png_timep *mod_time)

 #ifdef PNG_tRNS_SUPPORTED
 png_uint_32 PNGAPI
-png_get_tRNS(png_structp png_ptr, png_infop info_ptr,
+png_get_tRNS(png_const_structp png_ptr, png_infop info_ptr,
    png_bytep *trans_alpha, int *num_trans, png_color_16p *trans_color)
 {
   png_uint_32 retval = 0;
@@ -931,7 +939,7 @@ png_get_tRNS(png_structp png_ptr, png_infop info_ptr,

 #ifdef PNG_UNKNOWN_CHUNKS_SUPPORTED
 int PNGAPI
-png_get_unknown_chunks(png_structp png_ptr, png_infop info_ptr,
+png_get_unknown_chunks(png_const_structp png_ptr, png_const_infop info_ptr,
    png_unknown_chunkpp unknowns)
 {
   if (png_ptr != NULL && info_ptr != NULL && unknowns != NULL)
@@ -946,7 +954,7 @@ png_get_unknown_chunks(png_structp png_ptr, png_infop info_ptr,

 #ifdef PNG_READ_RGB_TO_GRAY_SUPPORTED
 png_byte PNGAPI
-png_get_rgb_to_gray_status (png_structp png_ptr)
+png_get_rgb_to_gray_status (png_const_structp png_ptr)
 {
   return (png_byte)(png_ptr ? png_ptr->rgb_to_gray_status : 0);
 }
@@ -954,14 +962,14 @@ png_get_rgb_to_gray_status (png_structp png_ptr)

 #ifdef PNG_USER_CHUNKS_SUPPORTED
 png_voidp PNGAPI
-png_get_user_chunk_ptr(png_structp png_ptr)
+png_get_user_chunk_ptr(png_const_structp png_ptr)
 {
   return (png_ptr ? png_ptr->user_chunk_ptr : NULL);
 }
 #endif

 png_size_t PNGAPI
-png_get_compression_buffer_size(png_structp png_ptr)
+png_get_compression_buffer_size(png_const_structp png_ptr)
 {
   return (png_ptr ? png_ptr->zbuf_size : 0L);
 }
@@ -971,27 +979,27 @@ png_get_compression_buffer_size(png_structp png_ptr)
 /* These functions were added to libpng 1.2.6 and were enabled
 * by default in libpng-1.4.0 */
 png_uint_32 PNGAPI
-png_get_user_width_max (png_structp png_ptr)
+png_get_user_width_max (png_const_structp png_ptr)
 {
   return (png_ptr ? png_ptr->user_width_max : 0);
 }

 png_uint_32 PNGAPI
-png_get_user_height_max (png_structp png_ptr)
+png_get_user_height_max (png_const_structp png_ptr)
 {
   return (png_ptr ? png_ptr->user_height_max : 0);
 }

 /* This function was added to libpng 1.4.0 */
 png_uint_32 PNGAPI
-png_get_chunk_cache_max (png_structp png_ptr)
+png_get_chunk_cache_max (png_const_structp png_ptr)
 {
   return (png_ptr ? png_ptr->user_chunk_cache_max : 0);
 }

 /* This function was added to libpng 1.4.1 */
 png_alloc_size_t PNGAPI
-png_get_chunk_malloc_max (png_structp png_ptr)
+png_get_chunk_malloc_max (png_const_structp png_ptr)
 {
   return (png_ptr ? png_ptr->user_chunk_malloc_max : 0);
 }
@@ -1005,6 +1013,15 @@ png_get_io_state (png_structp png_ptr)
   return png_ptr->io_state;
 }

+png_uint_32 PNGAPI
+png_get_io_chunk_type (png_const_structp png_ptr)
+{
+   return ((png_ptr->chunk_name[0] << 24) +
+           (png_ptr->chunk_name[1] << 16) +
+           (png_ptr->chunk_name[2] <<  8) +
+           (png_ptr->chunk_name[3]));
+}
+
 png_const_bytep PNGAPI
 png_get_io_chunk_name (png_structp png_ptr)
 {
--- a/pngmem.c
+++ b/pngmem.c
@@ -1,7 +1,7 @@

 /* pngmem.c - stub functions for memory allocation
 *
- * Last changed in libpng 1.5.0 [January 6, 2011]
+ * Last changed in libpng 1.5.1 [(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.)
@@ -647,7 +647,7 @@ png_set_mem_fn(png_structp png_ptr, png_voidp mem_ptr, png_malloc_ptr
 * pointer before png_write_destroy and png_read_destroy are called.
 */
 png_voidp PNGAPI
-png_get_mem_ptr(png_structp png_ptr)
+png_get_mem_ptr(png_const_structp png_ptr)
 {
   if (png_ptr == NULL)
      return (NULL);
--- a/pngpread.c
+++ b/pngpread.c
@@ -1,7 +1,7 @@

 /* pngpread.c - read a png file in push mode
 *
- * Last changed in libpng 1.5.0 [January 6, 2011]
+ * Last changed in libpng 1.5.1 [(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.)
@@ -41,6 +41,64 @@ png_process_data(png_structp png_ptr, png_infop info_ptr,
   }
 }

+png_size_t PNGAPI
+png_process_data_pause(png_structp png_ptr, int save)
+{
+   if (png_ptr != NULL)
+   {
+      /* It's easiest for the caller if we do the save, then the caller doesn't
+       * have to supply the same data again:
+       */
+      if (save)
+         png_push_save_buffer(png_ptr);
+      else
+      {
+         /* This includes any pending saved bytes: */
+         png_size_t remaining = png_ptr->buffer_size;
+         png_ptr->buffer_size = 0;
+
+         /* So subtract the saved buffer size, unless all the data
+          * is actually 'saved', in which case we just return 0
+          */
+         if (png_ptr->save_buffer_size < remaining)
+            return remaining - png_ptr->save_buffer_size;
+      }
+   }
+
+   return 0;
+}
+
+png_uint_32 PNGAPI
+png_process_data_skip(png_structp png_ptr)
+{
+   png_uint_32 remaining = 0;
+
+   if (png_ptr != NULL && png_ptr->process_mode == PNG_SKIP_MODE &&
+      png_ptr->skip_length > 0)
+   {
+      /* At the end of png_process_data the buffer size must be 0 (see the loop
+       * above) so we can detect a broken call here:
+       */
+      if (png_ptr->buffer_size != 0)
+         png_error(png_ptr,
+            "png_process_data_skip called inside png_process_data");
+
+      /* If is impossible for there to be a saved buffer at this point -
+       * otherwise we could not be in SKIP mode.  This will also happen if
+       * png_process_skip is called inside png_process_data (but only very
+       * rarely.)
+       */
+      if (png_ptr->save_buffer_size != 0)
+         png_error(png_ptr, "png_process_data_skip called with saved data");
+
+      remaining = png_ptr->skip_length;
+      png_ptr->skip_length = 0;
+      png_ptr->process_mode = PNG_READ_CHUNK_MODE;
+   }
+
+   return remaining;
+}
+
 /* What we do with the incoming data depends on what we were previously
 * doing before we ran out of data...
 */
@@ -1786,7 +1844,7 @@ png_set_progressive_read_fn(png_structp png_ptr, png_voidp progressive_ptr,
 }

 png_voidp PNGAPI
-png_get_progressive_ptr(png_structp png_ptr)
+png_get_progressive_ptr(png_const_structp png_ptr)
 {
   if (png_ptr == NULL)
      return (NULL);
--- a/pngpriv.h
+++ b/pngpriv.h
@@ -86,11 +86,28 @@ typedef PNG_CONST png_uint_16p FAR * png_const_uint_16pp;
 /* Unused formal parameter errors are removed using the following macro
 * which is expected to have no bad effects on performance.  Note that
 * if you replace it with something other than whitespace, you must include
- * the terminating semicolon.
+ * the terminating semicolon.  Also note that some of these might not
+ * work when "param" is a structure, but that is never the case in libpng.
 */
-#ifndef PNG_UNUSED
-#  define PNG_UNUSED(param) param = param;
-#endif
+#define PNG_UNUSED(param) {if(param){}}
+
+#if 0 /* Possibilities discussed on png-mng-implement, starting 27 Jan 2011 */
+#ifndef PNG_UNUSED                                 /* "best" but complex */
+ #if defined(__GNUC__) || defined(_MSC_VER)
+ #  define PNG_UNUSED(param) (void)param;
+ #else
+ #  define PNG_UNUSED(param)
+ #endif
+#define PNG_UNUSED(param) param = param;            /* What we used before */
+#define PNG_UNUSED(param) {(void)param;}            /* Visual C complains */
+#define PNG_UNUSED(param) if(param);                /* gcc-4.2 complains */
+#define PNG_UNUSED(param) if(param){}               /* more brackets nicer */
+#define PNG_UNUSED(param) ((void)(param ? 0 : 0));  /* 0:0 might be seen */
+#define PNG_UNUSED(param) {if(&param){}}            /* gcc-4 complains */
+#define PNG_UNUSED(param) {if(&param-&param){}}     /* No comment. */
+#define PNG_UNUSED(param) /* generates smallest (no) code but emits warning */
+#endif /* 0 */
+#endif /* PNG_UNUSED */

 /* Just a little check that someone hasn't tried to define something
 * contradictory.
--- a/pngrtran.c
+++ b/pngrtran.c
@@ -692,8 +692,13 @@ png_set_gray_to_rgb(png_structp png_ptr)
 {
   png_debug(1, "in png_set_gray_to_rgb");

-   png_ptr->transformations |= PNG_GRAY_TO_RGB;
-   png_ptr->flags &= ~PNG_FLAG_ROW_INIT;
+   if (png_ptr != NULL)
+   {
+      /* Because rgb must be 8 bits or more: */
+      png_set_expand_gray_1_2_4_to_8(png_ptr);
+      png_ptr->transformations |= PNG_GRAY_TO_RGB;
+      png_ptr->flags &= ~PNG_FLAG_ROW_INIT;
+   }
 }
 #endif

--- a/pngset.c
+++ b/pngset.c
@@ -522,27 +522,27 @@ png_set_sBIT(png_structp png_ptr, png_infop info_ptr,

 #ifdef PNG_sRGB_SUPPORTED
 void PNGAPI
-png_set_sRGB(png_structp png_ptr, png_infop info_ptr, int intent)
+png_set_sRGB(png_structp png_ptr, png_infop info_ptr, int srgb_intent)
 {
   png_debug1(1, "in %s storage function", "sRGB");

   if (png_ptr == NULL || info_ptr == NULL)
      return;

-   info_ptr->srgb_intent = (png_byte)intent;
+   info_ptr->srgb_intent = (png_byte)srgb_intent;
   info_ptr->valid |= PNG_INFO_sRGB;
 }

 void PNGAPI
 png_set_sRGB_gAMA_and_cHRM(png_structp png_ptr, png_infop info_ptr,
-    int intent)
+    int srgb_intent)
 {
   png_debug1(1, "in %s storage function", "sRGB_gAMA_and_cHRM");

   if (png_ptr == NULL || info_ptr == NULL)
      return;

-   png_set_sRGB(png_ptr, info_ptr, intent);
+   png_set_sRGB(png_ptr, info_ptr, srgb_intent);

 #  ifdef PNG_gAMA_SUPPORTED
   png_set_gAMA_fixed(png_ptr, info_ptr, 45455L);
--- a/pngtest.c
+++ b/pngtest.c
@@ -1784,4 +1784,4 @@ 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_1beta06 Your_png_h_is_not_version_1_5_1beta06;
+typedef png_libpng_version_1_5_1beta11 Your_png_h_is_not_version_1_5_1beta11;
--- a/pngtrans.c
+++ b/pngtrans.c
@@ -1,7 +1,7 @@

 /* pngtrans.c - transforms the data in a row (used by both readers and writers)
 *
- * Last changed in libpng 1.5.0 [January 6, 2011]
+ * Last changed in libpng 1.5.1 [(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.)
@@ -672,6 +672,7 @@ png_do_bgr(png_row_infop row_info, png_bytep row)

 #if defined(PNG_READ_USER_TRANSFORM_SUPPORTED) || \
    defined(PNG_WRITE_USER_TRANSFORM_SUPPORTED)
+#ifdef PNG_USER_TRANSFORM_PTR_SUPPORTED
 void PNGAPI
 png_set_user_transform_info(png_structp png_ptr, png_voidp
   user_transform_ptr, int user_transform_depth, int user_transform_channels)
@@ -680,33 +681,42 @@ png_set_user_transform_info(png_structp png_ptr, png_voidp

   if (png_ptr == NULL)
      return;
-#ifdef PNG_USER_TRANSFORM_PTR_SUPPORTED
   png_ptr->user_transform_ptr = user_transform_ptr;
   png_ptr->user_transform_depth = (png_byte)user_transform_depth;
   png_ptr->user_transform_channels = (png_byte)user_transform_channels;
-#else
-   if (user_transform_ptr || user_transform_depth || user_transform_channels)
-      png_warning(png_ptr,
-        "This version of libpng does not support user transform info");
-#endif
 }
+#endif

 /* This function returns a pointer to the user_transform_ptr associated with
 * the user transform functions.  The application should free any memory
 * associated with this pointer before png_write_destroy and png_read_destroy
 * are called.
 */
+#ifdef PNG_USER_TRANSFORM_PTR_SUPPORTED
 png_voidp PNGAPI
-png_get_user_transform_ptr(png_structp png_ptr)
+png_get_user_transform_ptr(png_const_structp png_ptr)
 {
   if (png_ptr == NULL)
      return (NULL);

-#ifdef PNG_USER_TRANSFORM_PTR_SUPPORTED
   return ((png_voidp)png_ptr->user_transform_ptr);
-#else
-   return (NULL);
+}
 #endif
+
+png_uint_32 PNGAPI
+png_get_current_row_number(png_const_structp png_ptr)
+{
+   if (png_ptr != NULL)
+      return png_ptr->row_number;
+   return PNG_UINT_32_MAX; /* help the app not to fail silently */
+}
+
+png_byte PNGAPI
+png_get_current_pass_number(png_const_structp png_ptr)
+{
+   if (png_ptr != NULL)
+      return png_ptr->pass;
+   return 8; /* invalid */
 }
 #endif /* PNG_READ_USER_TRANSFORM_SUPPORTED ||
          PNG_WRITE_USER_TRANSFORM_SUPPORTED */
--- a/pngvalid.c
+++ b/pngvalid.c
--- a/projects/vstudio/readme.txt
+++ b/projects/vstudio/readme.txt
@@ -1,7 +1,7 @@

 VisualStudio instructions

-libpng version 1.5.1beta06 - January 20, 2011
+libpng version 1.5.1beta11 - January 28, 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 1.5.1beta06 - January 20, 2011
+ * libpng version 1.5.1beta11 - January 28, 2011
 *
 * Copyright (c) 1998-2010 Glenn Randers-Pehrson
 *
--- a/scripts/README.txt
+++ b/scripts/README.txt
@@ -1,9 +1,9 @@

-Makefiles for  libpng version 1.5.1beta06 - January 20, 2011
+Makefiles for  libpng version 1.5.1beta11 - January 28, 2011

 pnglibconf.h.prebuilt       =>  Stores configuration settings
 makefile.linux    =>  Linux/ELF makefile
-                       (gcc, creates libpng15.so.15.1.5.1beta06)
+                       (gcc, creates libpng15.so.15.1.5.1beta11)
 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.15.1.5.1beta06)
+                       (gcc, creates libpng15.so.15.1.5.1beta11)
 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.15.1.5.1beta06)
+                       creates libpng15.so.15.1.5.1beta11)
 makefile.sgi      =>  Silicon Graphics IRIX makefile (cc, creates static lib)
 makefile.solaris  =>  Solaris 2.X makefile (gcc,
-                       creates libpng15.so.15.1.5.1beta06)
+                       creates libpng15.so.15.1.5.1beta11)
 makefile.so9      =>  Solaris 9 makefile (gcc,
-                       creates libpng15.so.15.1.5.1beta06)
+                       creates libpng15.so.15.1.5.1beta11)
 makefile.std      =>  Generic UNIX makefile (cc, creates static libpng.a)
 makefile.sunos    =>  Sun makefile
 makefile.32sunu   =>  Sun Ultra 32-bit makefile
--- a/scripts/libpng-config-head.in
+++ b/scripts/libpng-config-head.in
@@ -11,7 +11,7 @@

 # Modeled after libxml-config.

-version=1.5.1beta06
+version=1.5.1beta11
 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: 1.5.1beta06
+Version: 1.5.1beta11
 Libs: -L${libdir} -lpng15
 Cflags: -I${includedir}
--- a/scripts/makefile.32sunu
+++ b/scripts/makefile.32sunu
@@ -1,6 +1,6 @@
 # makefile for libpng on Solaris 2.x with cc
 # Contributed by William L. Sebok, based on makefile.linux
-# Copyright (C) 2002, 2006, 2010 Glenn Randers-Pehrson
+# Copyright (C) 2002, 2006, 2010-2011 Glenn Randers-Pehrson
 # Copyright (C) 1998 Greg Roelofs
 # Copyright (C) 1996, 1997 Andreas Dilger

--- a/scripts/makefile.64sunu
+++ b/scripts/makefile.64sunu
@@ -1,6 +1,6 @@
 # makefile for libpng on Solaris 2.x with cc
 # Contributed by William L. Sebok, based on makefile.linux
-# Copyright (C) 2002, 2006, 2010 Glenn Randers-Pehrson
+# Copyright (C) 2002, 2006, 2010-2011 Glenn Randers-Pehrson
 # Copyright (C) 1998 Greg Roelofs
 # Copyright (C) 1996, 1997 Andreas Dilger

--- a/scripts/makefile.beos
+++ b/scripts/makefile.beos
@@ -1,6 +1,6 @@
 # makefile for libpng on BeOS x86 ELF with gcc
 # modified from makefile.linux by Sander Stoks
-# Copyright (C) 2002, 2006, 2008, 2010 Glenn Randers-Pehrson
+# Copyright (C) 2002, 2006, 2008, 2010-2011 Glenn Randers-Pehrson
 # Copyright (C) 1999 Greg Roelofs
 # Copyright (C) 1996, 1997 Andreas Dilger
 #
--- a/scripts/makefile.darwin
+++ b/scripts/makefile.darwin
@@ -1,5 +1,5 @@
 # makefile for libpng on Darwin / Mac OS X
-# Copyright (C) 2002, 2004, 2006, 2008, 2010 Glenn Randers-Pehrson
+# Copyright (C) 2002, 2004, 2006, 2008, 2010-2011 Glenn Randers-Pehrson
 # Copyright (C) 2001 Christoph Pfisterer
 # derived from makefile.linux:
 #  Copyright (C) 1998, 1999 Greg Roelofs
--- a/scripts/makefile.dec
+++ b/scripts/makefile.dec
@@ -1,5 +1,5 @@
 # makefile for libpng on DEC Alpha Unix
-# Copyright (C) 2000-2002, 2006, 2010 Glenn Randers-Pehrson
+# Copyright (C) 2000-2002, 2006, 2010-2011 Glenn Randers-Pehrson
 # Copyright (C) 1995 Guy Eric Schalnat, Group 42, Inc.
 #
 # This code is released under the libpng license.
--- a/scripts/makefile.dj2
+++ b/scripts/makefile.dj2
@@ -1,5 +1,5 @@
 # DJGPP (DOS gcc) makefile for libpng
-# Copyright (C) 2002, 2006, 2009-2010 Glenn Randers-Pehrson
+# Copyright (C) 2002, 2006, 2009-2010-2011 Glenn Randers-Pehrson
 # Copyright (C) 1995 Guy Eric Schalnat, Group 42, Inc.
 #
 # This code is released under the libpng license.
--- a/scripts/makefile.elf
+++ b/scripts/makefile.elf
@@ -1,5 +1,5 @@
 # makefile for libpng.a and libpng15.so on Linux ELF with gcc
-# Copyright (C) 1998, 1999, 2002, 2006, 2008, 2010 Greg Roelofs
+# Copyright (C) 1998, 1999, 2002, 2006, 2008, 2010-2011 Greg Roelofs
 # and Glenn Randers-Pehrson
 # Copyright (C) 1996, 1997 Andreas Dilger
 #
--- a/scripts/makefile.hp64
+++ b/scripts/makefile.hp64
@@ -1,5 +1,5 @@
 # makefile for libpng, HPUX (10.20 and 11.00) using the ANSI/C product.
-# Copyright (C) 1999-2002, 2006, 2009, 2010 Glenn Randers-Pehrson
+# Copyright (C) 1999-2002, 2006, 2009, 2010-2011 Glenn Randers-Pehrson
 # Copyright (C) 1995 Guy Eric Schalnat, Group 42
 # contributed by Jim Rice and updated by Chris Schleicher, Hewlett Packard
 #
--- a/scripts/makefile.hpgcc
+++ b/scripts/makefile.hpgcc
@@ -1,5 +1,5 @@
 # makefile for libpng on HP-UX using GCC with the HP ANSI/C linker.
-# Copyright (C) 2002, 2006-2008, 2010 Glenn Randers-Pehrson
+# Copyright (C) 2002, 2006-2008, 2010-2011 Glenn Randers-Pehrson
 # Copyright (C) 2001, Laurent faillie
 # Copyright (C) 1998, 1999 Greg Roelofs
 # Copyright (C) 1996, 1997 Andreas Dilger
--- a/scripts/makefile.hpux
+++ b/scripts/makefile.hpux
@@ -1,5 +1,5 @@
 # makefile for libpng, HPUX (10.20 and 11.00) using the ANSI/C product.
-# Copyright (C) 1999-2002, 2006, 2010 Glenn Randers-Pehrson
+# Copyright (C) 1999-2002, 2006, 2010-2011 Glenn Randers-Pehrson
 # Copyright (C) 1995 Guy Eric Schalnat, Group 42
 # contributed by Jim Rice and updated by Chris Schleicher, Hewlett Packard
 #
--- a/scripts/makefile.linux
+++ b/scripts/makefile.linux
@@ -1,5 +1,5 @@
 # makefile for libpng.a and libpng15.so on Linux ELF with gcc
-# Copyright (C) 1998, 1999, 2002, 2006, 2008, 2010 Greg Roelofs and
+# Copyright (C) 1998, 1999, 2002, 2006, 2008, 2010-2011 Greg Roelofs and
 # Glenn Randers-Pehrson
 # Copyright (C) 1996, 1997 Andreas Dilger
 #
--- a/scripts/makefile.ne12bsd
+++ b/scripts/makefile.ne12bsd
@@ -17,7 +17,7 @@ INCSDIR=${LOCALBASE}/include/libpng15

 LIB=	png15
 SHLIB_MAJOR=	0
-SHLIB_MINOR=	1.5.1beta06
+SHLIB_MINOR=	1.5.1beta11
 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=	1.5.1beta06
+SHLIB_MINOR=	1.5.1beta11
 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=	1.5.1beta06
+SHLIB_MINOR=	1.5.1beta11

 LIB=	png
 SRCS=	png.c pngerror.c pngget.c pngmem.c pngpread.c \
--- a/scripts/makefile.sco
+++ b/scripts/makefile.sco
@@ -1,7 +1,7 @@
 # makefile for SCO OSr5  ELF and Unixware 7 with Native cc
 # Contributed by Mike Hopkirk (hops@sco.com) modified from Makefile.lnx
 #   force ELF build dynamic linking, SONAME setting in lib and RPATH in app
-# Copyright (C) 2002, 2006, 2010 Glenn Randers-Pehrson
+# Copyright (C) 2002, 2006, 2010-2011 Glenn Randers-Pehrson
 # Copyright (C) 1998 Greg Roelofs
 # Copyright (C) 1996, 1997 Andreas Dilger
 #
--- a/scripts/makefile.sggcc
+++ b/scripts/makefile.sggcc
@@ -1,5 +1,5 @@
 # makefile for libpng.a and libpng15.so, SGI IRIX with 'cc'
-# Copyright (C) 2001-2002, 2006, 2010 Glenn Randers-Pehrson
+# Copyright (C) 2001-2002, 2006, 2010-2011 Glenn Randers-Pehrson
 # Copyright (C) 1995 Guy Eric Schalnat, Group 42, Inc.
 #
 # This code is released under the libpng license.
--- a/scripts/makefile.sgi
+++ b/scripts/makefile.sgi
@@ -1,5 +1,5 @@
 # makefile for libpng.a and libpng15.so, SGI IRIX with 'cc'
-# Copyright (C) 2001-2002, 2006, 2007, 2010 Glenn Randers-Pehrson
+# Copyright (C) 2001-2002, 2006, 2007, 2010-2011 Glenn Randers-Pehrson
 # Copyright (C) 1995 Guy Eric Schalnat, Group 42, Inc.
 #
 # This code is released under the libpng license.
--- a/scripts/makefile.so9
+++ b/scripts/makefile.so9
@@ -1,7 +1,7 @@
 # makefile for libpng on Solaris 9 (beta) with Forte cc
 # Updated by Chad Schrock for Solaris 9
 # Contributed by William L. Sebok, based on makefile.linux
-# Copyright (C) 2002, 2006, 2008, 2010 Glenn Randers-Pehrson
+# Copyright (C) 2002, 2006, 2008, 2010-2011 Glenn Randers-Pehrson
 # Copyright (C) 1998-2001 Greg Roelofs
 # Copyright (C) 1996-1997 Andreas Dilger
 #
--- a/scripts/makefile.solaris
+++ b/scripts/makefile.solaris
@@ -1,5 +1,5 @@
 # makefile for libpng on Solaris 2.x with gcc
-# Copyright (C) 2004, 2006-2008, 2010 Glenn Randers-Pehrson
+# Copyright (C) 2004, 2006-2008, 2010-2011 Glenn Randers-Pehrson
 # Contributed by William L. Sebok, based on makefile.linux
 # Copyright (C) 1998 Greg Roelofs
 # Copyright (C) 1996, 1997 Andreas Dilger
--- a/scripts/makefile.solaris-x86
+++ b/scripts/makefile.solaris-x86
@@ -1,5 +1,5 @@
 # makefile for libpng on Solaris 2.x with gcc
-# Copyright (C) 2004, 2006-2008, 2010 Glenn Randers-Pehrson
+# Copyright (C) 2004, 2006-2008, 2010-2011 Glenn Randers-Pehrson
 # Contributed by William L. Sebok, based on makefile.linux
 # Copyright (C) 1998 Greg Roelofs
 # Copyright (C) 1996, 1997 Andreas Dilger
--- a/scripts/options.awk
+++ b/scripts/options.awk
@@ -3,7 +3,7 @@
 #
 # last changed in libpng version 1.5.0 - January 6, 2011
 #
-# Copyright (c) 1998-2010 Glenn Randers-Pehrson
+# Copyright (c) 1998-2011 Glenn Randers-Pehrson
 #
 # This code is released under the libpng license.
 # For conditions of distribution and use, see the disclaimer
--- a/scripts/pnglibconf.dfa
+++ b/scripts/pnglibconf.dfa
@@ -8,7 +8,7 @@ com pnglibconf.h - library build configuration
 com
 com libpng version 1.5.0 - January 6, 2011
 com
-com Copyright (c) 1998-2010 Glenn Randers-Pehrson
+com Copyright (c) 1998-2011 Glenn Randers-Pehrson
 com
 com This code is released under the libpng license.
 com For conditions of distribution and use, see the disclaimer
@@ -380,8 +380,10 @@ option WRITE_WEIGHTED_FILTER requires WRITE

 option WRITE_FLUSH requires WRITE

-# Note: this can be turned off explicitly, is this correct?
+# Note: these can be turned off explicitly if not required by the
+# apps implementing the user transforms
 option USER_TRANSFORM_PTR if READ_USER_TRANSFORM WRITE_USER_TRANSFORM
+option USER_TRANSFORM_INFO if READ_USER_TRANSFORM WRITE_USER_TRANSFORM

 # Any chunks you are not interested in, you can undef here.  The
 # ones that allocate memory may be expecially important (hIST,
--- a/scripts/pnglibconf.h.prebuilt
+++ b/scripts/pnglibconf.h.prebuilt
@@ -5,7 +5,7 @@

 /* libpng version 1.5.0 - last changed on January 6, 2011 */

-/* Copyright (c) 1998-2010 Glenn Randers-Pehrson */
+/* Copyright (c) 1998-2011 Glenn Randers-Pehrson */

 /* This code is released under the libpng license. */
 /* For conditions of distribution and use, see the disclaimer */
@@ -155,6 +155,7 @@
 #define PNG_WRITE_iTXt_SUPPORTED
 #define PNG_oFFs_SUPPORTED
 #define PNG_USER_TRANSFORM_PTR_SUPPORTED
+#define PNG_USER_TRANSFORM_INFO_SUPPORTED
 #define PNG_hIST_SUPPORTED
 #define PNG_iCCP_SUPPORTED
 #define PNG_sRGB_SUPPORTED
--- a/scripts/sym.dfn
+++ b/scripts/sym.dfn
@@ -2,7 +2,7 @@
 /* sym.dfn - define format of libpng.sym
 *
 * Last changed in libpng version 1.5.0 [January 6, 2011]
- * Copyright (c) 1998-2010 Glenn Randers-Pehrson
+ * Copyright (c) 1998-2011 Glenn Randers-Pehrson
 *
 * This code is released under the libpng license.
 * For conditions of distribution and use, see the disclaimer
--- a/scripts/symbols.def
+++ b/scripts/symbols.def
@@ -5,7 +5,7 @@
 LIBRARY

 EXPORTS
-;Version 1.5.1beta06
+;Version 1.5.1beta11
 png_access_version_number @1
 png_set_sig_bytes @2
 png_sig_cmp @3
@@ -221,3 +221,8 @@ EXPORTS
 png_set_sCAL_fixed @213
 png_get_sCAL_fixed @214
 png_set_background_fixed @215
+ png_get_io_chunk_type @216
+ png_get_current_row_number @217
+ png_get_current_pass_number @218
+ png_process_data_pause @219
+ png_process_data_skip @220
--- a/scripts/symbols.dfn
+++ b/scripts/symbols.dfn
@@ -2,7 +2,7 @@
 /* symbols.dfn - find all exported symbols
 *
 * Last changed in libpng version 1.5.0 [January 6, 2011]
- * Copyright (c) 1998-2010 Glenn Randers-Pehrson
+ * Copyright (c) 1998-2011 Glenn Randers-Pehrson
 *
 * This code is released under the libpng license.
 * For conditions of distribution and use, see the disclaimer
--- a/scripts/vers.dfn
+++ b/scripts/vers.dfn
@@ -2,7 +2,7 @@
 /* vers.dfn - define format of libpng.vers
 *
 * Last changed in libpng version 1.5.0 [January 6, 2011]
- * Copyright (c) 1998-2010 Glenn Randers-Pehrson
+ * Copyright (c) 1998-2011 Glenn Randers-Pehrson
 *
 * This code is released under the libpng license.
 * For conditions of distribution and use, see the disclaimer
--- a/test-pngvalid-full.sh
+++ b/test-pngvalid-full.sh
@@ -6,20 +6,14 @@ err=0
 echo >> pngtest-log.txt
 echo "============ pngvalid-full.sh ==============" >> pngtest-log.txt

-echo "Running test-pngvalid-full.sh -- it's lengthy, please wait..."
+echo "Running test-pngvalid-full.sh"
 for gamma in threshold transform sbit 16-to-8
 do
-   opts=
-   test "$gamma" = threshold || opts="$opts --nogamma-threshold"
-   test "$gamma" = transform || opts="$opts --nogamma-transform"
-   test "$gamma" = sbit      || opts="$opts --nogamma-sbit"
-   test "$gamma" = 16-to-8   || opts="$opts --nogamma-16-to-8"
-
-   if ./pngvalid --nostandard $opts >> pngtest-log.txt 2>&1
+   if ./pngvalid "--gamma-$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
@@ -9,18 +9,20 @@ echo "============ pngvalid-simple.sh ==============" >> pngtest-log.txt
 echo "Running test-pngvalid-simple.sh"
 # The options to test are:
 #
-# --progressive-read, --interlace on the 'transform' images
-# --progressive-read on the 'size' images
+# standard tests with and without progressive reading and interlace
+# size images with and without progressive reading
+# transform tests (standard, non-interlaced only)
 #
-for opts in "" --progressive-read --interlace \
-   "--progressive-read --interlace" "--nostandard --size" \
-   "--nostandard --size --progressive-read"
+for opts in "--standard" "--standard --progressive-read" \
+   "--standard --interlace" "--standard --progressive-read --interlace" \
+   "--size" "--size --progressive-read" \
+   "--transform"
 do
-   if ./pngvalid  --nogamma $opts >> pngtest-log.txt 2>&1
+   if ./pngvalid  $opts >> pngtest-log.txt 2>&1
   then
-      echo "  PASS:" pngvalid --nogamma $opts
+      echo "  PASS:" pngvalid $opts
   else
-      echo "  FAIL:" pngvalid --nogamma $opts
+      echo "  FAIL:" pngvalid $opts
      err=1
   fi
 done
Author	SHA1	Message	Date
Glenn Randers-Pehrson	254670338e	[devel] Imported from libpng-1.5.1beta11.tar	2011-01-28 15:16:05 -06:00
Glenn Randers-Pehrson	bf3293a3cb	[devel] Fixed comments around PNG_UNUSED macro definition in pngpriv.h	2011-01-28 15:14:43 -06:00
Glenn Randers-Pehrson	4e7c47fb73	[devel] Updated CHANGES and ANNOUNCE.	2011-01-28 07:05:53 -06:00
John Bowler	afea7d19e0	[devel] Add-transform-tests-to-pngvalid-simplify-arguments	2011-01-28 06:38:14 -06:00
John Bowler	fca50dfab3	[devel] Correct-local-variable-type-in-new-API-png_process	2011-01-28 06:34:02 -06:00
Glenn Randers-Pehrson	4e2e14addf	[devel] Changed PNG_UNUSED from "param=param;" to "{if(param){}}".	2011-01-27 13:23:08 -06:00
Glenn Randers-Pehrson	0e15da5b94	[devel] Simplified the PNG_UNUSED macro.	2011-01-27 12:45:56 -06:00
Glenn Randers-Pehrson	2774238722	[devel] Trying a different PNG_UNUSED macro.	2011-01-27 09:37:34 -06:00
Glenn Randers-Pehrson	0012e9cd54	[devel] Imported from libpng-1.5.1beta10.tar	2011-01-26 22:05:32 -06:00
Glenn Randers-Pehrson	8d0bc0f026	[devel] Made the manual, synopses, and function prototypes use the function argument names file_gamma, int_file_gamma, and srgb_intent consistently.	2011-01-25 22:15:58 -06:00
Glenn Randers-Pehrson	81ce889435	[devel] Fixed incorrect examples of callback prototypes in the manual. "png_ptr ptr" should be "png_structp png_ptr"	2011-01-24 08:04:37 -06:00
Glenn Randers-Pehrson	135d17ce3e	[devel] Bump to version libpng-1.5.1beta10	2011-01-24 00:18:05 -06:00
Glenn Randers-Pehrson	9962b84659	[devel] Imported from libpng-1.5.1beta09.tar	2011-01-24 00:14:22 -06:00
Glenn Randers-Pehrson	b0b058b767	[devel] Updated CHANGDES and ANNOUNCE files about John's checkin.	2011-01-24 00:13:36 -06:00
John Bowler	f21a0d0eee	[devel] Enhance pngvalid, correct an error in gray_to_rgb, correct doc error.	2011-01-23 23:55:19 -06:00
Glenn Randers-Pehrson	d52cd11ed2	[devel] Bump to version libpng-1.5.1beta09	2011-01-22 20:23:07 -06:00
Glenn Randers-Pehrson	3bd489d315	[devel] Imported from libpng-1.5.1beta08.tar	2011-01-22 20:19:10 -06:00
Glenn Randers-Pehrson	cbabd9c7e1	[devel] Updated CHANGES and ANNOUNCE.	2011-01-22 18:37:17 -06:00
John Bowler	f19abd6725	[devel] Added four new convenience functions (John Bowler)	2011-01-22 18:29:24 -06:00
John Bowler	0a5c9c02fa	[devel] Corrected const_png_ in png.h to png_const_ to avoid polluting the namespace. Added png_get_current_row_number and png_get_current_pass_number for the benefit of the user transform callback. Added png_process_data_pause and png_process_data_skip for the benefit of progressive readers that need to stop data processing or want to optimize skipping of unread data (e.g. if the reader marks a chunk to be skipped.)	2011-01-22 17:36:34 -06:00
Glenn Randers-Pehrson	155ce40218	[devel] Rebuilt Makefile.in and configure from the new sources.	2011-01-22 17:12:32 -06:00
John Bowler	71a10f2ca1	[devel] Attempted to fix cpp on Solaris with S. Studio 12 cc, fix build Added a make macro DFNCPP that is a CPP that will accept the tokens in a .dfn file and adds configure stuff to test for such a CPP. ./configure should fail if one is not available.	2011-01-22 17:03:33 -06:00
Glenn Randers-Pehrson	a861ed971e	[devel] Added synopses for the IO_STATE functions and other missing synopses to the manual. Removed the synopses from libpngpf.3 because they were out of date and no longer useful. Better information can be obtained by reading the prototypes and comments in pngpriv.h	2011-01-22 16:46:37 -06:00
Glenn Randers-Pehrson	bb98bcba91	[manual] Updated libpng.3 synopses to agree with scripts/symbols.def	2011-01-22 16:27:39 -06:00
John Bowler	adaffe7761	[devel] Add png_get_io_chunk_type to scripts/symbols.def	2011-01-22 14:35:36 -06:00
Glenn Randers-Pehrson	cf7cce6da5	[devel] Corrected (again) the ordinal of png_get_io_chunk_type().	2011-01-22 12:42:43 -06:00
Glenn Randers-Pehrson	aa23159209	[devel] Bump to version libpng-1.5.1beta08	2011-01-22 12:37:40 -06:00
Glenn Randers-Pehrson	c63409b078	[devel] Corrected the ordinal for the new function in png.h	2011-01-22 09:42:19 -06:00
Glenn Randers-Pehrson	eac893b60b	[devel] Added synopses for the IO_STATE functions to the manual.	2011-01-22 09:06:38 -06:00
Glenn Randers-Pehrson	a63dbedead	[devel] Added png_get_io_chunk_type() and deprecated png_get_io_chunk_name()	2011-01-22 08:51:19 -06:00
Glenn Randers-Pehrson	5c5db5a55f	[devel] Imported from libpng-1.5.1beta07.tar	2011-01-21 23:32:11 -06:00
Glenn Randers-Pehrson	7bc25013f0	[devel] Updated manual synopses, fixed several typos, put paramter descriptions in proper order, applied libpng indentation style in code snippets.	2011-01-21 23:29:09 -06:00
Glenn Randers-Pehrson	b86b4928d6	[devel] Added const_png_structp and const_png_infop types, and used them in prototypes for most png_get_*() functions.	2011-01-21 23:12:51 -06:00
Glenn Randers-Pehrson	2cb633b915	[devel] In the manual, describe the png_get_IHDR() arguments in the right order.	2011-01-21 08:31:29 -06:00
Glenn Randers-Pehrson	47457a01f7	[devel] Bump to version libpng-1.5.1rc01	2011-01-21 08:25:26 -06:00