changeset 10578:6b5ef47dcbc9

Merge
author lana
date Mon, 26 Sep 2011 14:29:34 -0700
parents bc5710332b29 b637c25cf5c7
children 1016a2947a34
files jdk/src/share/native/sun/awt/libpng/pnggccrd.c jdk/src/share/native/sun/awt/libpng/pngvcrd.c
diffstat 29 files changed, 19202 insertions(+), 21874 deletions(-) [+]
line wrap: on
line diff
--- a/jdk/src/share/native/sun/awt/libpng/CHANGES	Wed Jul 05 17:51:25 2017 +0200
+++ b/jdk/src/share/native/sun/awt/libpng/CHANGES	Mon Sep 26 14:29:34 2011 -0700
@@ -1,5 +1,5 @@
-/* 
- * Copyright (c) 2005, 2007, Oracle and/or its affiliates. All rights reserved.
+/*
+ * Copyright (c) 2011, Oracle and/or its affiliates. All rights reserved.
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  *
  * This code is free software; you can redistribute it and/or modify it
@@ -23,13 +23,15 @@
  * questions.
  */
 
+#if 0
+libpng_changes(){ /*
 CHANGES - changes for libpng
 
-version 0.2
+Version 0.2
   added reader into png.h
   fixed small problems in stub file
 
-version 0.3
+Version 0.3
   added pull reader
   split up pngwrite.c to several files
   added pnglib.txt
@@ -38,9 +40,9 @@
   fixed some bugs in writer
   interfaced with zlib 0.5
   added K&R support
-  added check for 64 KB blocks for 16 bit machines
-
-version 0.4
+  added check for 64 KB blocks for 16-bit machines
+
+Version 0.4
   cleaned up code and commented code
   simplified time handling into png_time
   created png_color_16 and png_color_8 to handle color needs
@@ -51,28 +53,28 @@
   cleaned up zTXt reader and writer (using zlib's Reset functions)
   split transformations into pngrtran.c and pngwtran.c
 
-version 0.5
+Version 0.5
   interfaced with zlib 0.8
   fixed many reading and writing bugs
   saved using 3 spaces instead of tabs
 
-version 0.6
+Version 0.6
   added png_large_malloc() and png_large_free()
   added png_size_t
   cleaned up some compiler warnings
   added png_start_read_image()
 
-version 0.7
+Version 0.7
   cleaned up lots of bugs
   finished dithering and other stuff
   added test program
   changed name from pnglib to libpng
 
-version 0.71 [June, 1995]
+Version 0.71 [June, 1995]
   changed pngtest.png for zlib 0.93
   fixed error in libpng.txt and example.c
 
-version 0.8
+Version 0.8
   cleaned up some bugs
   added png_set_filler()
   split up pngstub.c into pngmem.c, pngio.c, and pngerror.c
@@ -86,191 +88,194 @@
   changed external functions passing floats to doubles (k&r problems?)
   put all the configurable stuff in pngconf.h
   enabled png_set_shift to work with paletted images on read
-  added png_read_update_info() - updates info structure with
-     transformations
-
-version 0.81 [August, 1995]
+  added png_read_update_info() - updates info structure with transformations
+
+Version 0.81 [August, 1995]
   incorporated Tim Wegner's medium model code (thanks, Tim)
 
-version 0.82 [September, 1995]
+Version 0.82 [September, 1995]
   [unspecified changes]
 
-version 0.85 [December, 1995]
+Version 0.85 [December, 1995]
   added more medium model code (almost everything's a far)
   added i/o, error, and memory callback functions
-  fixed some bugs (16 bit, 4 bit interlaced, etc.)
+  fixed some bugs (16-bit, 4-bit interlaced, etc.)
   added first run progressive reader (barely tested)
 
-version 0.86 [January, 1996]
+Version 0.86 [January, 1996]
   fixed bugs
   improved documentation
 
-version 0.87 [January, 1996]
+Version 0.87 [January, 1996]
   fixed medium model bugs
   fixed other bugs introduced in 0.85 and 0.86
   added some minor documentation
 
-version 0.88 [January, 1996]
+Version 0.88 [January, 1996]
   fixed progressive bugs
   replaced tabs with spaces
   cleaned up documentation
   added callbacks for read/write and warning/error functions
 
-version 0.89 [July, 1996]
-  added new initialization API to make libpng work better with shared libs
-     we now have png_create_read_struct(), png_create_write_struct(),
-     png_create_info_struct(), png_destroy_read_struct(), and
-     png_destroy_write_struct() instead of the separate calls to
-     malloc and png_read_init(), png_info_init(), and png_write_init()
-  changed warning/error callback functions to fix bug - this means you
-     should use the new initialization API if you were using the old
-     png_set_message_fn() calls, and that the old API no longer exists
-     so that people are aware that they need to change their code
-  changed filter selection API to allow selection of multiple filters
-     since it didn't work in previous versions of libpng anyways
-  optimized filter selection code
-  fixed png_set_background() to allow using an arbitrary RGB color for
-     paletted images
-  fixed gamma and background correction for paletted images, so
-     png_correct_palette is not needed unless you are correcting an
-     external palette (you will need to #define PNG_CORRECT_PALETTE_SUPPORTED
-     in pngconf.h) - if nobody uses this, it may disappear in the future.
-  fixed bug with Borland 64K memory allocation (Alexander Lehmann)
-  fixed bug in interlace handling (Smarasderagd, I think)
-  added more error checking for writing and image to reduce invalid files
-  separated read and write functions so that they won't both be linked
-     into a binary when only reading or writing functionality is used
-  new pngtest image also has interlacing and zTXt
-  updated documentation to reflect new API
-
-version 0.90 [January, 1997]
-  made CRC errors/warnings on critical and ancillary chunks configurable
+Version 0.89 [July, 1996]
+  Added new initialization API to make libpng work better with shared libs
+    we now have png_create_read_struct(), png_create_write_struct(),
+    png_create_info_struct(), png_destroy_read_struct(), and
+    png_destroy_write_struct() instead of the separate calls to
+    malloc and png_read_init(), png_info_init(), and png_write_init()
+  Changed warning/error callback functions to fix bug - this means you
+    should use the new initialization API if you were using the old
+    png_set_message_fn() calls, and that the old API no longer exists
+    so that people are aware that they need to change their code
+  Changed filter selection API to allow selection of multiple filters
+    since it didn't work in previous versions of libpng anyways
+  Optimized filter selection code
+  Fixed png_set_background() to allow using an arbitrary RGB color for
+    paletted images
+  Fixed gamma and background correction for paletted images, so
+    png_correct_palette is not needed unless you are correcting an
+    external palette (you will need to #define PNG_CORRECT_PALETTE_SUPPORTED
+    in pngconf.h) - if nobody uses this, it may disappear in the future.
+  Fixed bug with Borland 64K memory allocation (Alexander Lehmann)
+  Fixed bug in interlace handling (Smarasderagd, I think)
+  Added more error checking for writing and image to reduce invalid files
+  Separated read and write functions so that they won't both be linked
+    into a binary when only reading or writing functionality is used
+  New pngtest image also has interlacing and zTXt
+  Updated documentation to reflect new API
+
+Version 0.90 [January, 1997]
+  Made CRC errors/warnings on critical and ancillary chunks configurable
   libpng will use the zlib CRC routines by (compile-time) default
-  changed DOS small/medium model memory support - needs zlib 1.04 (Tim Wegner)
-  added external C++ wrapper statements to png.h (Gilles Dauphin)
-  allow PNG file to be read when some or all of file signature has already
-     been read from the beginning of the stream.  ****This affects the size
-     of info_struct and invalidates all programs that use a shared libpng****
-  fixed png_filler() declarations
-  fixed? background color conversions
-  fixed order of error function pointers to match documentation
-  current chunk name is now available in png_struct to reduce the number
-     of nearly identical error messages (will simplify multi-lingual
-     support when available)
-  try to get ready for unknown-chunk callback functions:
-     - previously read critical chunks are flagged, so the chunk handling
-       routines can determine if the chunk is in the right place
-     - all chunk handling routines have the same prototypes, so we will
-       be able to handle all chunks via a callback mechanism
-  try to fix Linux "setjmp" buffer size problems
-  removed png_large_malloc, png_large_free, and png_realloc functions.
-
-version 0.95 [March, 1997]
-  fixed bug in pngwutil.c allocating "up_row" twice and "avg_row" never
-  fixed bug in PNG file signature compares when start != 0
-  changed parameter type of png_set_filler(...filler...) from png_byte
-     to png_uint_32
-  added test for MACOS to ensure that both math.h and fp.h are not #included
-  added macros for libpng to be compiled as a Windows DLL (Andreas Kupries)
-  added "packswap" transformation, which changes the endianness of
-     packed-pixel bytes (Kevin Bracey)
-  added "strip_alpha" transformation, which removes the alpha channel of
-     input images without using it (not necessarily a good idea)
-  added "swap_alpha" transformation, which puts the alpha channel in front
-     of the color bytes instead of after
-  removed all implicit variable tests which assume NULL == 0 (I think)
-  changed several variables to "png_size_t" to show 16/32-bit limitations
-  added new pCAL chunk read/write support
-  added experimental filter selection weighting (Greg Roelofs)
-  removed old png_set_rgbx() and png_set_xrgb() functions that have been
+  Changed DOS small/medium model memory support - needs zlib 1.04 (Tim Wegner)
+  Added external C++ wrapper statements to png.h (Gilles Dauphin)
+  Allow PNG file to be read when some or all of file signature has already
+    been read from the beginning of the stream.  ****This affects the size
+    of info_struct and invalidates all programs that use a shared libpng****
+  Fixed png_filler() declarations
+  Fixed? background color conversions
+  Fixed order of error function pointers to match documentation
+  Current chunk name is now available in png_struct to reduce the number
+    of nearly identical error messages (will simplify multi-lingual
+    support when available)
+  Try to get ready for unknown-chunk callback functions:
+    - previously read critical chunks are flagged, so the chunk handling
+      routines can determine if the chunk is in the right place
+    - all chunk handling routines have the same prototypes, so we will
+      be able to handle all chunks via a callback mechanism
+  Try to fix Linux "setjmp" buffer size problems
+  Removed png_large_malloc, png_large_free, and png_realloc functions.
+
+Version 0.95 [March, 1997]
+  Fixed bug in pngwutil.c allocating "up_row" twice and "avg_row" never
+  Fixed bug in PNG file signature compares when start != 0
+  Changed parameter type of png_set_filler(...filler...) from png_byte
+    to png_uint_32
+  Added test for MACOS to ensure that both math.h and fp.h are not #included
+  Added macros for libpng to be compiled as a Windows DLL (Andreas Kupries)
+  Added "packswap" transformation, which changes the endianness of
+    packed-pixel bytes (Kevin Bracey)
+  Added "strip_alpha" transformation, which removes the alpha channel of
+    input images without using it (not necessarily a good idea)
+  Added "swap_alpha" transformation, which puts the alpha channel in front
+    of the color bytes instead of after
+  Removed all implicit variable tests which assume NULL == 0 (I think)
+  Changed several variables to "png_size_t" to show 16/32-bit limitations
+  Added new pCAL chunk read/write support
+  Added experimental filter selection weighting (Greg Roelofs)
+  Removed old png_set_rgbx() and png_set_xrgb() functions that have been
      obsolete for about 2 years now (use png_set_filler() instead)
-  added macros to read 16- and 32-bit ints directly from buffer, to be
-     used only on those systems that support it (namely PowerPC and 680x0)
-     With some testing, this may become the default for MACOS/PPC systems.
-  only calculate CRC on data if we are going to use it
-  added macros for zTXt compression type PNG_zTXt_COMPRESSION_???
-  added macros for simple libpng debugging output selectable at compile time
-  removed PNG_READ_END_MODE in progressive reader (Smarasderagd)
-  more description of info_struct in libpng.txt and png.h
-  more instructions in example.c
-  more chunk types tested in pngtest.c
-  renamed pngrcb.c to pngset.c, and all png_read_<chunk> functions to be
-     png_set_<chunk>.  We now have corresponding png_get_<chunk>
-     functions in pngget.c to get information in info_ptr.  This isolates
-     the application from the internal organization of png_info_struct
-     (good for shared library implementations).
-
-version 0.96 [May, 1997]
-  fixed serious bug with < 8bpp images introduced in 0.95
-  fixed 256-color transparency bug (Greg Roelofs)
-  fixed up documentation (Greg Roelofs, Laszlo Nyul)
-  fixed "error" in pngconf.h for Linux setjmp() behaviour
-  fixed DOS medium model support (Tim Wegner)
-  fixed png_check_keyword() for case with error in static string text
-  added read of CRC after IEND chunk for embedded PNGs (Laszlo Nyul)
-  added typecasts to quiet compiler errors
-  added more debugging info
-
-version 0.97 [January, 1998]
-  removed PNG_USE_OWN_CRC capability
-  relocated png_set_crc_action from pngrutil.c to pngrtran.c
-  fixed typecasts of "new_key", etc. (Andreas Dilger)
-  added RFC 1152 [sic] date support
-  fixed bug in gamma handling of 4-bit grayscale
-  added 2-bit grayscale gamma handling (Glenn R-P)
-  added more typecasts. 65536L becomes (png_uint_32)65536L, etc. (Glenn R-P)
-  minor corrections in libpng.txt
-  added simple sRGB support (Glenn R-P)
-  easier conditional compiling, e.g. define PNG_READ/WRITE_NOT_FULLY_SUPPORTED;
-     all configurable options can be selected from command-line instead
-     of having to edit pngconf.h (Glenn R-P)
-  fixed memory leak in pngwrite.c (free info_ptr->text) (Glenn R-P)
-  added more conditions for png_do_background, to avoid changing
-     black pixels to background when a background is supplied and
-     no pixels are transparent
-  repaired PNG_NO_STDIO behaviour
-  tested NODIV support and made it default behaviour (Greg Roelofs)
-  added "-m" option and PNGTEST_DEBUG_MEMORY to pngtest (John Bowler)
-  regularized version numbering scheme and bumped shared-library major
+  Added macros to read 16- and 32-bit ints directly from buffer, to be
+    used only on those systems that support it (namely PowerPC and 680x0)
+    With some testing, this may become the default for MACOS/PPC systems.
+  Only calculate CRC on data if we are going to use it
+  Added macros for zTXt compression type PNG_zTXt_COMPRESSION_???
+  Added macros for simple libpng debugging output selectable at compile time
+  Removed PNG_READ_END_MODE in progressive reader (Smarasderagd)
+  More description of info_struct in libpng.txt and png.h
+  More instructions in example.c
+  More chunk types tested in pngtest.c
+  Renamed pngrcb.c to pngset.c, and all png_read_<chunk> functions to be
+    png_set_<chunk>.  We now have corresponding png_get_<chunk>
+    functions in pngget.c to get information in info_ptr.  This isolates
+    the application from the internal organization of png_info_struct
+    (good for shared library implementations).
+
+Version 0.96 [May, 1997]
+  Fixed serious bug with < 8bpp images introduced in 0.95
+  Fixed 256-color transparency bug (Greg Roelofs)
+  Fixed up documentation (Greg Roelofs, Laszlo Nyul)
+  Fixed "error" in pngconf.h for Linux setjmp() behaviour
+  Fixed DOS medium model support (Tim Wegner)
+  Fixed png_check_keyword() for case with error in static string text
+  Added read of CRC after IEND chunk for embedded PNGs (Laszlo Nyul)
+  Added typecasts to quiet compiler errors
+  Added more debugging info
+
+Version 0.97 [January, 1998]
+  Removed PNG_USE_OWN_CRC capability
+  Relocated png_set_crc_action from pngrutil.c to pngrtran.c
+  Fixed typecasts of "new_key", etc. (Andreas Dilger)
+  Added RFC 1152 [sic] date support
+  Fixed bug in gamma handling of 4-bit grayscale
+  Added 2-bit grayscale gamma handling (Glenn R-P)
+  Added more typecasts. 65536L becomes (png_uint_32)65536L, etc. (Glenn R-P)
+  Minor corrections in libpng.txt
+  Added simple sRGB support (Glenn R-P)
+  Easier conditional compiling, e.g. define PNG_READ/WRITE_NOT_FULLY_SUPPORTED;
+    all configurable options can be selected from command-line instead
+    of having to edit pngconf.h (Glenn R-P)
+  Fixed memory leak in pngwrite.c (free info_ptr->text) (Glenn R-P)
+  Added more conditions for png_do_background, to avoid changing
+    black pixels to background when a background is supplied and
+    no pixels are transparent
+  Repaired PNG_NO_STDIO behaviour
+  Tested NODIV support and made it default behaviour (Greg Roelofs)
+  Added "-m" option and PNGTEST_DEBUG_MEMORY to pngtest (John Bowler)
+  Regularized version numbering scheme and bumped shared-library major
      version number to 2 to avoid problems with libpng 0.89 apps (Greg Roelofs)
 
-version 0.98 [January, 1998]
-  cleaned up some typos in libpng.txt and in code documentation
-  fixed memory leaks in pCAL chunk processing (Glenn R-P and John Bowler)
-  cosmetic change "display_gamma" to "screen_gamma" in pngrtran.c
-  changed recommendation about file_gamma for PC images to .51 from .45,
-     in example.c and libpng.txt, added comments to distinguish between
-     screen_gamma, viewing_gamma, and display_gamma.
-  changed all references to RFC1152 to read RFC1123 and changed the
-     PNG_TIME_RFC1152_SUPPORTED macro to PNG_TIME_RFC1123_SUPPORTED
-  added png_invert_alpha capability (Glenn R-P -- suggestion by Jon Vincent)
-  changed srgb_intent from png_byte to int to avoid compiler bugs
-
-version 0.99 [January 30, 1998]
-  free info_ptr->text instead of end_info_ptr->text in pngread.c (John Bowler)
-  fixed a longstanding "packswap" bug in pngtrans.c
-  fixed some inconsistencies in pngconf.h that prevented compiling with
-     PNG_READ_GAMMA_SUPPORTED and PNG_READ_hIST_SUPPORTED undefined
-  fixed some typos and made other minor rearrangement of libpng.txt (Andreas)
-  changed recommendation about file_gamma for PC images to .50 from .51 in
-     example.c and libpng.txt, and changed file_gamma for sRGB images to .45
-  added a number of functions to access information from the png structure
-     png_get_image_height(), etc. (Glenn R-P, suggestion by Brad Pettit)
-  added TARGET_MACOS similar to zlib-1.0.8
-  define PNG_ALWAYS_EXTERN when __MWERKS__ && WIN32 are defined
-  added type casting to all png_malloc() function calls
-version 0.99a [January 31, 1998]
+Version 0.98 [January, 1998]
+  Cleaned up some typos in libpng.txt and in code documentation
+  Fixed memory leaks in pCAL chunk processing (Glenn R-P and John Bowler)
+  Cosmetic change "display_gamma" to "screen_gamma" in pngrtran.c
+  Changed recommendation about file_gamma for PC images to .51 from .45,
+    in example.c and libpng.txt, added comments to distinguish between
+    screen_gamma, viewing_gamma, and display_gamma.
+  Changed all references to RFC1152 to read RFC1123 and changed the
+    PNG_TIME_RFC1152_SUPPORTED macro to PNG_TIME_RFC1123_SUPPORTED
+  Added png_invert_alpha capability (Glenn R-P -- suggestion by Jon Vincent)
+  Changed srgb_intent from png_byte to int to avoid compiler bugs
+
+Version 0.99 [January 30, 1998]
+  Free info_ptr->text instead of end_info_ptr->text in pngread.c (John Bowler)
+  Fixed a longstanding "packswap" bug in pngtrans.c
+  Fixed some inconsistencies in pngconf.h that prevented compiling with
+    PNG_READ_GAMMA_SUPPORTED and PNG_READ_hIST_SUPPORTED undefined
+  Fixed some typos and made other minor rearrangement of libpng.txt (Andreas)
+  Changed recommendation about file_gamma for PC images to .50 from .51 in
+    example.c and libpng.txt, and changed file_gamma for sRGB images to .45
+  Added a number of functions to access information from the png structure
+    png_get_image_height(), etc. (Glenn R-P, suggestion by Brad Pettit)
+  Added TARGET_MACOS similar to zlib-1.0.8
+  Define PNG_ALWAYS_EXTERN when __MWERKS__ && WIN32 are defined
+  Added type casting to all png_malloc() function calls
+
+Version 0.99a [January 31, 1998]
   Added type casts and parentheses to all returns that return a value.(Tim W.)
-version 0.99b [February 4, 1998]
+
+Version 0.99b [February 4, 1998]
   Added type cast png_uint_32 on malloc function calls where needed.
   Changed type of num_hist from png_uint_32 to int (same as num_palette).
   Added checks for rowbytes overflow, in case png_size_t is less than 32 bits.
   Renamed makefile.elf to makefile.lnx.
-version 0.99c [February 7, 1998]
+
+Version 0.99c [February 7, 1998]
   More type casting.  Removed erroneous overflow test in pngmem.c.
   Added png_buffered_memcpy() and png_buffered_memset(), apply them to rowbytes.
   Added UNIX manual pages libpng.3 (incorporating libpng.txt) and  png.5.
-version 0.99d [February 11, 1998]
+
+Version 0.99d [February 11, 1998]
   Renamed "far_to_near()" "png_far_to_near()"
   Revised libpng.3
   Version 99c "buffered" operations didn't work as intended.  Replaced them
@@ -280,7 +285,8 @@
   Check for overlength tRNS chunk present when indexed-color PLTE is read.
   Cleaned up spelling errors in libpng.3/libpng.txt
   Corrected a problem with png_get_tRNS() which returned undefined trans array
-version 0.99e [February 28, 1998]
+
+Version 0.99e [February 28, 1998]
   Corrected png_get_tRNS() again.
   Add parentheses for easier reading of pngget.c, fixed "||" should be "&&".
   Touched up example.c to make more of it compileable, although the entire
@@ -290,53 +296,59 @@
   Replaced pngtest.png with one created with zlib 1.1.1
   Changed pngtest to report PASS even when file size is different (Jean-loup G.)
   Corrected some logic errors in png_do_invert_alpha() (Chris Patterson)
-version 0.99f [March 5, 1998]
+
+Version 0.99f [March 5, 1998]
   Corrected a bug in pngpread() introduced in version 99c (Kevin Bracey)
   Moved makefiles into a "scripts" directory, and added INSTALL instruction file
   Added makefile.os2 and pngos2.def (A. Zabolotny) and makefile.s2x (W. Sebok)
   Added pointers to "note on libpng versions" in makefile.lnx and README
   Added row callback feature when reading and writing nonprogressive rows
-     and added a test of this feature in pngtest.c
+    and added a test of this feature in pngtest.c
   Added user transform callbacks, with test of the feature in pngtest.c
-version 0.99g [March 6, 1998, morning]
+
+Version 0.99g [March 6, 1998, morning]
   Minor changes to pngtest.c to suppress compiler warnings.
   Removed "beta" language from documentation.
-version 0.99h [March 6, 1998, evening]
+
+Version 0.99h [March 6, 1998, evening]
   Minor changes to previous minor changes to pngtest.c
   Changed PNG_READ_NOT_FULLY_SUPPORTED to PNG_READ_TRANSFORMS_NOT_SUPPORTED
-  and added PNG_PROGRESSIVE_READ_NOT_SUPPORTED macro
+    and added PNG_PROGRESSIVE_READ_NOT_SUPPORTED macro
   Added user transform capability
 
-version 1.00 [March 7, 1998]
+Version 1.00 [March 7, 1998]
   Changed several typedefs in pngrutil.c
   Added makefile.wat (Pawel Mrochen), updated makefile.tc3 (Willem van Schaik)
-  replaced "while(1)" with "for(;;)"
-  added PNGARG() to prototypes in pngtest.c and removed some prototypes
-  updated some of the makefiles (Tom Lane)
-  changed some typedefs (s_start, etc.) in pngrutil.c
-  fixed dimensions of "short_months" array in pngwrite.c
+  Replaced "while(1)" with "for(;;)"
+  Added PNGARG() to prototypes in pngtest.c and removed some prototypes
+  Updated some of the makefiles (Tom Lane)
+  Changed some typedefs (s_start, etc.) in pngrutil.c
+  Fixed dimensions of "short_months" array in pngwrite.c
   Replaced ansi2knr.c with the one from jpeg-v6
 
-version 1.0.0 [March 8, 1998]
+Version 1.0.0 [March 8, 1998]
   Changed name from 1.00 to 1.0.0 (Adam Costello)
   Added smakefile.ppc (with SCOPTIONS.ppc) for Amiga PPC (Andreas Kleinert)
-version 1.0.0a [March 9, 1998]
+
+Version 1.0.0a [March 9, 1998]
   Fixed three bugs in pngrtran.c to make gamma+background handling consistent
-  (Greg Roelofs)
+    (Greg Roelofs)
   Changed format of the PNG_LIBPNG_VER integer to xyyzz instead of xyz
-  for major, minor, and bugfix releases.  This is 10001. (Adam Costello,
-  Tom Lane)
+    for major, minor, and bugfix releases.  This is 10001. (Adam Costello,
+    Tom Lane)
   Make months range from 1-12 in png_convert_to_rfc1123
-version 1.0.0b [March 13, 1998]
+
+Version 1.0.0b [March 13, 1998]
   Quieted compiler complaints about two empty "for" loops in pngrutil.c
   Minor changes to makefile.s2x
   Removed #ifdef/#endif around a png_free() in pngread.c
 
-version 1.0.1 [March 14, 1998]
+Version 1.0.1 [March 14, 1998]
   Changed makefile.s2x to reduce security risk of using a relative pathname
   Fixed some typos in the documentation (Greg).
   Fixed a problem with value of "channels" returned by png_read_update_info()
-version 1.0.1a [April 21, 1998]
+
+Version 1.0.1a [April 21, 1998]
   Optimized Paeth calculations by replacing abs() function calls with intrinsics
   plus other loop optimizations. Improves avg decoding speed by about 20%.
   Commented out i386istic "align" compiler flags in makefile.lnx.
@@ -350,19 +362,24 @@
   Moved a misplaced pngrutil code block that truncates tRNS if it has more
     than num_palette entries -- test was done before num_palette was defined.
   Fixed a png_convert_to_rfc1123() bug that converts day 31 to 0 (Steve Eddins).
-  Changed compiler flags in makefile.wat for better optimization (Pawel Mrochen).
-version 1.0.1b [May 2, 1998]
+  Changed compiler flags in makefile.wat for better optimization
+    (Pawel Mrochen).
+
+Version 1.0.1b [May 2, 1998]
   Relocated png_do_gray_to_rgb() within png_do_read_transformations() (Greg).
   Relocated the png_composite macros from pngrtran.c to png.h (Greg).
   Added makefile.sco (contributed by Mike Hopkirk).
   Fixed two bugs (missing definitions of "istop") introduced in libpng-1.0.1a.
   Fixed a bug in pngrtran.c that would set channels=5 under some circumstances.
-  More work on the Paeth-filtering, achieving imperceptible speedup (A Kleinert).
-  More work on loop optimization which may help when compiled with C++ compilers.
+  More work on the Paeth-filtering, achieving imperceptible speedup
+    (A Kleinert).
+  More work on loop optimization which may help when compiled with C++
+    compilers.
   Added warnings when people try to use transforms they've defined out.
   Collapsed 4 "i" and "c" loops into single "i" loops in pngrtran and pngwtran.
   Revised paragraph about png_set_expand() in libpng.txt and libpng.3 (Greg)
-version 1.0.1c [May 11, 1998]
+
+Version 1.0.1c [May 11, 1998]
   Fixed a bug in pngrtran.c (introduced in libpng-1.0.1a) where the masks for
     filler bytes should have been 0xff instead of 0xf.
   Added max_pixel_depth=32 in pngrutil.c when using FILLER with palette images.
@@ -374,7 +391,8 @@
     to remove unwanted capabilities via the compile line
   Made some corrections to grammar (which, it's) in documentation (Greg).
   Corrected example.c, use of row_pointers in png_write_image().
-version 1.0.1d [May 24, 1998]
+
+Version 1.0.1d [May 24, 1998]
   Corrected several statements that used side effects illegally in pngrutil.c
     and pngtrans.c, that were introduced in version 1.0.1b
   Revised png_read_rows() to avoid repeated if-testing for NULL (A Kleinert)
@@ -384,7 +402,8 @@
     Bob Dellaca, to make a png32bd.dll with Borland C++ 4.5
   Fixed error in example.c with png_set_text: num_text is 3, not 2 (Guido V.)
   Changed several loops from count-down to count-up, for consistency.
-version 1.0.1e [June 6, 1998]
+
+Version 1.0.1e [June 6, 1998]
   Revised libpng.txt and libpng.3 description of png_set_read|write_fn(), and
     added warnings when people try to set png_read_fn and png_write_fn in
     the same structure.
@@ -401,9 +420,10 @@
     PNGTEST_DEBUG_MEM feature.
   Added makefile.w32, for Microsoft C++ 4.0 and later (Tim Wegner).
 
-version 1.0.2 [June 14, 1998]
+Version 1.0.2 [June 14, 1998]
   Fixed two bugs in makefile.bor .
-version 1.0.2a [December 30, 1998]
+
+Version 1.0.2a [December 30, 1998]
   Replaced and extended code that was removed from png_set_filler() in 1.0.1a.
   Fixed a bug in png_do_filler() that made it fail to write filler bytes in
     the left-most pixel of each row (Kevin Bracey).
@@ -425,21 +445,24 @@
   Added png_get_copyright() and png_get_header_version() functions.
   Revised comments on png_set_progressive_read_fn() in libpng.txt and example.c
   Added information about debugging in libpng.txt and libpng.3 .
-  Changed "ln -sf" to "ln -s -f" in makefile.s2x, makefile.lnx, and makefile.sco.
+  Changed "ln -sf" to "ln -s -f" in makefile.s2x, makefile.lnx, and
+    makefile.sco.
   Removed lines after Dynamic Dependencies" in makefile.aco .
   Revised makefile.dec to make a shared library (Jeremie Petit).
   Removed trailing blanks from all files.
-version 1.0.2a [January 6, 1999]
+
+Version 1.0.2a [January 6, 1999]
   Removed misplaced #endif and #ifdef PNG_NO_EXTERN near the end of png.h
   Added "if" tests to silence complaints about unused png_ptr in png.h and png.c
   Changed "check_if_png" function in example.c to return true (nonzero) if PNG.
   Changed libpng.txt to demonstrate png_sig_cmp() instead of png_check_sig()
     which is obsolete.
 
-version 1.0.3 [January 14, 1999]
+Version 1.0.3 [January 14, 1999]
   Added makefile.hux, for Hewlett Packard HPUX 10.20 and 11.00 (Jim Rice)
   Added a statement of Y2K compliance in png.h, libpng.3, and Y2KINFO.
-version 1.0.3a [August 12, 1999]
+
+Version 1.0.3a [August 12, 1999]
   Added check for PNG_READ_INTERLACE_SUPPORTED in pngread.c; issue a warning
      if an attempt is made to read an interlaced image when it's not supported.
   Added check if png_ptr->trans is defined before freeing it in pngread.c
@@ -466,13 +489,15 @@
   Correct gamma with srgb is 45455 instead of 45000 in pngrutil.c, to be
     consistent with PNG-1.2, and allow variance of 500 before complaining.
   Added assembler code contributed by Intel in file pngvcrd.c and modified
-    makefile.w32 to use it (Nirav Chhatrapati, INTEL Corporation, Gilles Vollant)
+    makefile.w32 to use it (Nirav Chhatrapati, INTEL Corporation,
+    Gilles Vollant)
   Changed "ln -s -f" to "ln -f -s" in the makefiles to make Solaris happy.
   Added some aliases for png_set_expand() in pngrtran.c, namely
     png_set_expand_PLTE(), png_set_expand_depth(), and png_set_expand_tRNS()
     (Greg Roelofs, in "PNG: The Definitive Guide").
   Added makefile.beo for BEOS on X86, contributed by Sander Stok.
-version 1.0.3b [August 26, 1999]
+
+Version 1.0.3b [August 26, 1999]
   Replaced 2147483647L several places with PNG_MAX_UINT macro, defined in png.h
   Changed leading blanks to tabs in all makefiles.
   Define PNG_USE_PNGVCRD in makefile.w32, to get MMX assembler code.
@@ -484,12 +509,13 @@
     negative shift distance, whose results are undefined in the C language.
   Added a check in pngset.c to prevent writing multiple tIME chunks.
   Added a check in pngwrite.c to detect invalid small window_bits sizes.
-version 1.0.3d [September 4, 1999]
+
+Version 1.0.3d [September 4, 1999]
   Fixed type casting of igamma in pngrutil.c
   Added new png_expand functions to scripts/pngdef.pas and pngos2.def
   Added a demo read_user_transform_fn that examines the row filters in pngtest.c
 
-version 1.0.4 [September 24, 1999]
+Version 1.0.4 [September 24, 1999]
   Define PNG_ALWAYS_EXTERN in pngconf.h if __STDC__ is defined
   Delete #define PNG_INTERNAL and include "png.h" from pngasmrd.h
   Made several minor corrections to pngtest.c
@@ -503,24 +529,30 @@
     assembler code) and makefile.vcwin32 (doesn't).
   Added a CPU timing report to pngtest.c (enabled by defining PNGTEST_TIMING)
   Added a copy of pngnow.png to the distribution.
-version 1.0.4a [September 25, 1999]
+
+Version 1.0.4a [September 25, 1999]
   Increase max_pixel_depth in pngrutil.c if a user transform needs it.
   Changed several division operations to right-shifts in pngvcrd.c
-version 1.0.4b [September 30, 1999]
+
+Version 1.0.4b [September 30, 1999]
   Added parentheses in line 3732 of pngvcrd.c
   Added a comment in makefile.linux warning about buggy -O3 in pgcc 2.95.1
-version 1.0.4c [October 1, 1999]
+
+Version 1.0.4c [October 1, 1999]
   Added a "png_check_version" function in png.c and pngtest.c that will generate
     a helpful compiler error if an old png.h is found in the search path.
   Changed type of png_user_transform_depth|channels from int to png_byte.
-version 1.0.4d [October 6, 1999]
+
+Version 1.0.4d [October 6, 1999]
   Changed 0.45 to 0.45455 in png_set_sRGB()
   Removed unused PLTE entries from pngnow.png
   Re-enabled some parts of pngvcrd.c (png_combine_row) that work properly.
-version 1.0.4e [October 10, 1999]
+
+Version 1.0.4e [October 10, 1999]
   Fixed sign error in pngvcrd.c (Greg Roelofs)
   Replaced some instances of memcpy with simple assignments in pngvcrd (GR-P)
-version 1.0.4f [October 15, 1999]
+
+Version 1.0.4f [October 15, 1999]
   Surrounded example.c code with #if 0 .. #endif to prevent people from
     inadvertently trying to compile it.
   Changed png_get_header_version() from a function to a macro in png.h
@@ -528,9 +560,10 @@
   Removed some pointless "ptr = NULL" in pngmem.c
   Added a "contrib" directory containing the source code from Greg's book.
 
-version 1.0.5 [October 15, 1999]
+Version 1.0.5 [October 15, 1999]
   Minor editing of the INSTALL and README files.
-version 1.0.5a [October 23, 1999]
+
+Version 1.0.5a [October 23, 1999]
   Added contrib/pngsuite and contrib/pngminus (Willem van Schaik)
   Fixed a typo in the png_set_sRGB() function call in example.c (Jan Nijtmans)
   Further optimization and bugfix of pngvcrd.c
@@ -538,14 +571,16 @@
     text_ptr structure.  Instead, it makes its own copy.
   Created separate write_end_info_struct in pngtest.c for a more severe test.
   Added code in pngwrite.c to free info_ptr->text[i].key to stop a memory leak.
-version 1.0.5b [November 23, 1999]
+
+Version 1.0.5b [November 23, 1999]
   Moved PNG_FLAG_HAVE_CHUNK_HEADER, PNG_FLAG_BACKGROUND_IS_GRAY and
     PNG_FLAG_WROTE_tIME from flags to mode.
   Added png_write_info_before_PLTE() function.
   Fixed some typecasting in contrib/gregbook/*.c
   Updated scripts/makevms.com and added makevms.com to contrib/gregbook
     and contrib/pngminus (Martin Zinser)
-version 1.0.5c [November 26, 1999]
+
+Version 1.0.5c [November 26, 1999]
   Moved png_get_header_version from png.h to png.c, to accommodate ansi2knr.
   Removed all global arrays (according to PNG_NO_GLOBAL_ARRAYS macro), to
     accommodate making DLL's: Moved usr_png_ver from global variable to function
@@ -558,14 +593,17 @@
   Removed some extraneous "-I" from contrib/pngminus/makefile.std
   Changed the PNG_sRGB_INTENT macros in png.h to be consistent with PNG-1.2.
   Change PNG_SRGB_INTENT to PNG_sRGB_INTENT in libpng.txt and libpng.3
-version 1.0.5d [November 29, 1999]
+
+Version 1.0.5d [November 29, 1999]
   Add type cast (png_const_charp) two places in png.c
   Eliminated pngtypes.h; use macros instead to declare PNG_CHNK arrays.
   Renamed "PNG_GLOBAL_ARRAYS" to "PNG_USE_GLOBAL_ARRAYS" and made available
     to applications a macro "PNG_USE_LOCAL_ARRAYS".
-  #ifdef out all the new declarations when PNG_USE_GLOBAL_ARRAYS is defined.
+  comment out (with #ifdef) all the new declarations when
+    PNG_USE_GLOBAL_ARRAYS is defined.
   Added PNG_EXPORT_VAR macro to accommodate making DLL's.
-version 1.0.5e [November 30, 1999]
+
+Version 1.0.5e [November 30, 1999]
   Added iCCP, iTXt, and sPLT support; added "lang" member to the png_text
     structure; refactored the inflate/deflate support to make adding new chunks
     with trailing compressed parts easier in the future, and added new functions
@@ -586,18 +624,21 @@
     PNG_cHNK_SUPPORTED and combined the three types of PNG_text_SUPPORTED
     macros, leaving the separate macros also available.
   Removed comments on #endifs at the end of many short, non-nested #if-blocks.
-version 1.0.5f [December 6, 1999]
+
+Version 1.0.5f [December 6, 1999]
   Changed makefile.solaris to issue a warning about potential problems when
     the ucb "ld" is in the path ahead of the ccs "ld".
   Removed "- [date]" from the "synopsis" line in libpng.3 and libpngpf.3.
   Added sCAL chunk support (Eric S. Raymond).
-version 1.0.5g [December 7, 1999]
+
+Version 1.0.5g [December 7, 1999]
   Fixed "png_free_spallettes" typo in png.h
   Added code to handle new chunks in pngpread.c
   Moved PNG_CHNK string macro definitions outside of PNG_NO_EXTERN block
   Added "translated_key" to png_text structure and png_write_iTXt().
   Added code in pngwrite.c to work around a newly discovered zlib bug.
-version 1.0.5h [December 10, 1999]
+
+Version 1.0.5h [December 10, 1999]
   NOTE: regarding the note for version 1.0.5e, the following must also
     be included in your code:
         png_text[i].translated_key = NULL;
@@ -605,7 +646,8 @@
   Option to eliminate all floating point support was added.  Some new
     fixed-point functions such as png_set_gAMA_fixed() were added.
   Expanded tabs and removed trailing blanks in source files.
-version 1.0.5i [December 13, 1999]
+
+Version 1.0.5i [December 13, 1999]
   Added some type casts to silence compiler warnings.
   Renamed "png_free_spalette" to "png_free_spalettes" for consistency.
   Removed leading blanks from a #define in pngvcrd.c
@@ -617,7 +659,8 @@
   Added png_free_hIST() function.
   Various patches to fix bugs in the sCAL and integer cHRM processing,
     and to add some convenience macros for use with sCAL.
-version 1.0.5j [December 21, 1999]
+
+Version 1.0.5j [December 21, 1999]
   Changed "unit" parameter of png_write_sCAL from png_byte to int, to work
     around buggy compilers.
   Added new type "png_fixed_point" for integers that hold float*100000 values
@@ -633,7 +676,8 @@
     and to write the iTXt chunk after IDAT if it appears in the end_ptr.
   Added pnggccrd.c, version of pngvcrd.c Intel assembler for gcc (Greg Roelofs)
   Reversed the order of trying to write floating-point and fixed-point gAMA.
-version 1.0.5k [December 27, 1999]
+
+Version 1.0.5k [December 27, 1999]
   Added many parentheses, e.g., "if (a && b & c)" becomes "if (a && (b & c))"
   Added png_handle_as_unknown() function (Glenn)
   Added png_free_chunk_list() function and chunk_list and num_chunk_list members
@@ -644,33 +688,41 @@
   Added png_free_tRNS(); png_set_tRNS() now malloc's its own trans array (ESR).
   Define png_get_int_32 when oFFs chunk is supported as well as when pCAL is.
   Changed type of proflen from png_int_32 to png_uint_32 in png_get_iCCP().
-version 1.0.5l [January 1, 2000]
+
+Version 1.0.5l [January 1, 2000]
   Added functions png_set_read_user_chunk_fn() and png_get_user_chunk_ptr()
     for setting a callback function to handle unknown chunks and for
     retrieving the associated user pointer (Glenn).
-version 1.0.5m [January 7, 2000]
+
+Version 1.0.5m [January 7, 2000]
   Added high-level functions png_read_png(), png_write_png(), png_free_pixels().
-version 1.0.5n [January 9, 2000]
+
+Version 1.0.5n [January 9, 2000]
   Added png_free_PLTE() function, and modified png_set_PLTE() to malloc its
     own memory for info_ptr->palette.  This makes it safe for the calling
     application to free its copy of the palette any time after it calls
     png_set_PLTE().
-version 1.0.5o [January 20, 2000]
+
+Version 1.0.5o [January 20, 2000]
   Cosmetic changes only (removed some trailing blanks and TABs)
-version 1.0.5p [January 31, 2000]
+
+Version 1.0.5p [January 31, 2000]
   Renamed pngdll.mak to makefile.bd32
   Cosmetic changes in pngtest.c
-version 1.0.5q [February 5, 2000]
+
+Version 1.0.5q [February 5, 2000]
   Relocated the makefile.solaris warning about PATH problems.
   Fixed pngvcrd.c bug by pushing/popping registers in mmxsupport (Bruce Oberg)
   Revised makefile.gcmmx
   Added PNG_SETJMP_SUPPORTED, PNG_SETJMP_NOT_SUPPORTED, and PNG_ABORT() macros
-version 1.0.5r [February 7, 2000]
+
+Version 1.0.5r [February 7, 2000]
   Removed superfluous prototype for png_get_itxt from png.h
   Fixed a bug in pngrtran.c that improperly expanded the background color.
   Return *num_text=0 from png_get_text() when appropriate, and fix documentation
     of png_get_text() in libpng.txt/libpng.3.
-version 1.0.5s [February 18, 2000]
+
+Version 1.0.5s [February 18, 2000]
   Added "png_jmp_env()" macro to pngconf.h, to help people migrate to the
     new error handler that's planned for the next libpng release, and changed
     example.c, pngtest.c, and contrib programs to use this macro.
@@ -689,7 +741,8 @@
   Added png_set_rows() and png_get_rows(), for use with png_read|write_png().
   Modified png_read_png() to allocate info_ptr->row_pointers only if it
     hasn't already been allocated.
-version 1.0.5t [March 4, 2000]
+
+Version 1.0.5t [March 4, 2000]
   Changed png_jmp_env() migration aiding macro to png_jmpbuf().
   Fixed "interlace" typo (should be "interlaced") in contrib/gregbook/read2-x.c
   Fixed bug with use of PNG_BEFORE_IHDR bit in png_ptr->mode, introduced when
@@ -698,13 +751,15 @@
     a 24-bit visual if one is available, and to allow abbreviated options.
   Files in contrib/pngminus were revised to use the png_jmpbuf() macro.
   Removed spaces in makefile.linux and makefile.gcmmx, introduced in 1.0.5s
-version 1.0.5u [March 5, 2000]
+
+Version 1.0.5u [March 5, 2000]
   Simplified the code that detects old png.h in png.c and pngtest.c
   Renamed png_spalette (_p, _pp) to png_sPLT_t (_tp, _tpp)
   Increased precision of rgb_to_gray calculations from 8 to 15 bits and
     added png_set_rgb_to_gray_fixed() function.
   Added makefile.bc32 (32-bit Borland C++, C mode)
-version 1.0.5v [March 11, 2000]
+
+Version 1.0.5v [March 11, 2000]
   Added some parentheses to the png_jmpbuf macro definition.
   Updated references to the zlib home page, which has moved to freesoftware.com.
   Corrected bugs in documentation regarding png_read_row() and png_write_row().
@@ -712,10 +767,11 @@
   Renamed makefile.borland,turboc3 back to makefile.bor,tc3 as in version 1.0.3,
     revised borland makefiles; added makefile.ibmvac3 and makefile.gcc (Cosmin)
 
-version 1.0.6 [March 20, 2000]
+Version 1.0.6 [March 20, 2000]
   Minor revisions of makefile.bor, libpng.txt, and gregbook/rpng2-win.c
   Added makefile.sggcc (SGI IRIX with gcc)
-version 1.0.6d [April 7, 2000]
+
+Version 1.0.6d [April 7, 2000]
   Changed sprintf() to strcpy() in png_write_sCAL_s() to work without STDIO
   Added data_length parameter to png_decompress_chunk() function
   Revised documentation to remove reference to abandoned png_free_chnk functions
@@ -724,7 +780,8 @@
   Renamed makefile.ibmvac3 to makefile.ibmc, added libpng.icc IBM project file
   Added a check for info_ptr->free_me&PNG_FREE_TEXT when freeing text in png.c
   Simplify png_sig_bytes() function to remove use of non-ISO-C strdup().
-version 1.0.6e [April 9, 2000]
+
+Version 1.0.6e [April 9, 2000]
   Added png_data_freer() function.
   In the code that checks for over-length tRNS chunks, added check of
     info_ptr->num_trans as well as png_ptr->num_trans (Matthias Benckmann)
@@ -735,25 +792,29 @@
     is defined.
   Changed several instances of PNG_NO_CONSOLE_ID to PNG_NO_STDIO in pngrutil.c
     and mentioned the purposes of the two macros in libpng.txt/libpng.3.
-version 1.0.6f [April 14, 2000]
+
+Version 1.0.6f [April 14, 2000]
   Revised png_set_iCCP() and png_set_rows() to avoid prematurely freeing data.
   Add checks in png_set_text() for NULL members of the input text structure.
   Revised libpng.txt/libpng.3.
-  Removed superfluous prototype for png_set_itxt from png.h
+  Removed superfluous prototype for png_set_iTXt from png.h
   Removed "else" from pngread.c, after png_error(), and changed "0" to "length".
   Changed several png_errors about malformed ancillary chunks to png_warnings.
-version 1.0.6g [April 24, 2000]
+
+Version 1.0.6g [April 24, 2000]
   Added png_pass-* arrays to pnggccrd.c when PNG_USE_LOCAL_ARRAYS is defined.
   Relocated paragraph about png_set_background() in libpng.3/libpng.txt
     and other revisions (Matthias Benckmann)
   Relocated info_ptr->free_me, png_ptr->free_me, and other info_ptr and
     png_ptr members to restore binary compatibility with libpng-1.0.5
     (breaks compatibility with libpng-1.0.6).
-version 1.0.6h [April 24, 2000]
+
+Version 1.0.6h [April 24, 2000]
   Changed shared library so-number pattern from 2.x.y.z to xy.z (this builds
     libpng.so.10 & libpng.so.10.6h instead of libpng.so.2 & libpng.so.2.1.0.6h)
     This is a temporary change for test purposes.
-version 1.0.6i [May 2, 2000]
+
+Version 1.0.6i [May 2, 2000]
   Rearranged some members at the end of png_info and png_struct, to put
     unknown_chunks_num and free_me within the original size of the png_structs
     and free_me, png_read_user_fn, and png_free_fn within the original png_info,
@@ -778,11 +839,13 @@
     generate a libpng error if the modes aren't set and PNG_LEGACY_SUPPORTED
     was not defined.
   Added makefile.intel and updated makefile.watcom (Pawel Mrochen)
-version 1.0.6j [May 3, 2000]
+
+Version 1.0.6j [May 3, 2000]
   Overloaded png_read_init() and png_write_init() with macros that convert
     calls to png_read_init_2() or png_write_init_2() that check the version
     and structure sizes.
-version 1.0.7beta11 [May 7, 2000]
+
+Version 1.0.7beta11 [May 7, 2000]
   Removed the new PNG_CREATED_READ_STRUCT and PNG_CREATED_WRITE_STRUCT modes
     which are no longer used.
   Eliminated the three new members of png_text when PNG_LEGACY_SUPPORTED is
@@ -793,7 +856,8 @@
   Added PNGAPI macro, and added it to the definitions of all exported functions.
   Relocated version macro definitions ahead of the includes of zlib.h and
     pngconf.h in png.h.
-version 1.0.7beta12 [May 12, 2000]
+
+Version 1.0.7beta12 [May 12, 2000]
   Revised pngset.c to avoid a problem with expanding the png_debug macro.
   Deleted some extraneous defines from pngconf.h
   Made PNG_NO_CONSOLE_IO the default condition when PNG_BUILD_DLL is defined.
@@ -801,7 +865,8 @@
   Added png_access_version_number() function.
   Check for mask&PNG_FREE_CHNK (for TEXT, SCAL, PCAL) in png_free_data().
   Expanded libpng.3/libpng.txt information about png_data_freer().
-version 1.0.7beta14 [May 17, 2000] (beta13 was not published)
+
+Version 1.0.7beta14 [May 17, 2000] (beta13 was not published)
   Changed pnggccrd.c and pngvcrd.c to handle bad adaptive filter types as
     warnings instead of errors, as pngrutil.c does.
   Set the PNG_INFO_IDAT valid flag in png_set_rows() so png_write_png()
@@ -813,7 +878,8 @@
   Removed info_ptr->valid tests from png_free_data(), as in version 1.0.5.
   Added png_set_invalid() function.
   Fixed incorrect illustrations of png_destroy_write_struct() in example.c.
-version 1.0.7beta15 [May 30, 2000]
+
+Version 1.0.7beta15 [May 30, 2000]
   Revised the deliberately erroneous Linux setjmp code in pngconf.h to produce
     fewer error messages.
   Rearranged checks for Z_OK to check the most likely path first in pngpread.c
@@ -825,9 +891,11 @@
   Fixed some bugs in the unused PNG_INCH_CONVERSIONS functions in pngget.c
   Set each pointer to NULL after freeing it in png_free_data().
   Worked around a problem in pngconf.h; AIX's strings.h defines an "index"
-    macro that conflicts with libpng's png_color_16.index. (Dimitri Papadapoulos)
+    macro that conflicts with libpng's png_color_16.index. (Dimitri
+    Papadapoulos)
   Added "msvc" directory with MSVC++ project files (Simon-Pierre Cadieux).
-version 1.0.7beta16 [June 4, 2000]
+
+Version 1.0.7beta16 [June 4, 2000]
   Revised the workaround of AIX string.h "index" bug.
   Added a check for overlength PLTE chunk in pngrutil.c.
   Added PNG_NO_POINTER_INDEXING macro to use array-indexing instead of pointer
@@ -837,23 +905,27 @@
   Added PNG_USE_DLL macro.
   Revised the copyright/disclaimer/license notice.
   Added contrib/msvctest directory
-version 1.0.7rc1 [June 9, 2000]
+
+Version 1.0.7rc1 [June 9, 2000]
   Corrected the definition of PNG_TRANSFORM_INVERT_ALPHA  (0x0400 not 0x0200)
   Added contrib/visupng directory (Willem van Schaik)
-version 1.0.7beta18 [June 23, 2000]
+
+Version 1.0.7beta18 [June 23, 2000]
   Revised PNGAPI definition, and pngvcrd.c to work with __GCC__
     and do not redefine PNGAPI if it is passed in via a compiler directive.
   Revised visupng/PngFile.c to remove returns from within the Try block.
   Removed leading underscores from "_PNG_H" and "_PNG_SAVE_BSD_SOURCE" macros.
   Updated contrib/visupng/cexcept.h to version 1.0.0.
   Fixed bugs in pngwrite.c and pngwutil.c that prevented writing iCCP chunks.
-version 1.0.7rc2 [June 28, 2000]
+
+Version 1.0.7rc2 [June 28, 2000]
   Updated license to include disclaimers required by UCITA.
   Fixed "DJBPP" typo in pnggccrd.c introduced in beta18.
 
-version 1.0.7 [July 1, 2000]
+Version 1.0.7 [July 1, 2000]
   Revised the definition of "trans_values" in libpng.3/libpng.txt
-version 1.0.8beta1 [July 8, 2000]
+
+Version 1.0.8beta1 [July 8, 2000]
   Added png_free(png_ptr, key) two places in pngpread.c to stop memory leaks.
   Changed PNG_NO_STDIO to PNG_NO_CONSOLE_IO, several places in pngrutil.c and
      pngwutil.c.
@@ -861,25 +933,30 @@
   Removed unused "#include <assert.h>" from png.c
   Added WindowsCE support.
   Revised pnggccrd.c to work with gcc-2.95.2 and in the Cygwin environment.
-version 1.0.8beta2 [July 10, 2000]
+
+Version 1.0.8beta2 [July 10, 2000]
   Added project files to the wince directory and made further revisions
      of pngtest.c, pngrio.c, and pngwio.c in support of WindowsCE.
-version 1.0.8beta3 [July 11, 2000]
+
+Version 1.0.8beta3 [July 11, 2000]
   Only set the PNG_FLAG_FREE_TRNS or PNG_FREE_TRNS flag in png_handle_tRNS()
      for indexed-color input files to avoid potential double-freeing trans array
      under some unusual conditions; problem was introduced in version 1.0.6f.
   Further revisions to pngtest.c and files in the wince subdirectory.
-version 1.0.8beta4 [July 14, 2000]
+
+Version 1.0.8beta4 [July 14, 2000]
   Added the files pngbar.png and pngbar.jpg to the distribution.
   Added makefile.cygwin, and cygwin support in pngconf.h
   Added PNG_NO_ZALLOC_ZERO macro (makes png_zalloc skip zeroing memory)
-version 1.0.8rc1 [July 16, 2000]
+
+Version 1.0.8rc1 [July 16, 2000]
   Revised png_debug() macros and statements to eliminate compiler warnings.
 
-version 1.0.8 [July 24, 2000]
+Version 1.0.8 [July 24, 2000]
   Added png_flush() in pngwrite.c, after png_write_IEND().
   Updated makefile.hpux to build a shared library.
-version 1.0.9beta1 [November 10, 2000]
+
+Version 1.0.9beta1 [November 10, 2000]
   Fixed typo in scripts/makefile.hpux
   Updated makevms.com in scripts and contrib/* and contrib/* (Martin Zinser)
   Fixed seqence-point bug in contrib/pngminus/png2pnm (Martin Zinser)
@@ -898,59 +975,72 @@
   Revised makefile.cygwin
   Fixed bugs in iCCP support in pngrutil.c and pngwutil.c.
   Replaced png_set_empty_plte_permitted() with png_permit_mng_features().
-version 1.0.9beta2 [November 19, 2000]
+
+Version 1.0.9beta2 [November 19, 2000]
   Renamed the "dll" subdirectory "projects".
   Added borland project files to "projects" subdirectory.
   Set VS_FF_PRERELEASE and VS_FF_PATCHED flags in msvc/png.rc when appropriate.
   Add error message in png_set_compression_buffer_size() when malloc fails.
-version 1.0.9beta3 [November 23, 2000]
+
+Version 1.0.9beta3 [November 23, 2000]
   Revised PNG_LIBPNG_BUILD_TYPE macro in png.h, used in the msvc project.
   Removed the png_flush() in pngwrite.c that crashes some applications
     that don't set png_output_flush_fn.
   Added makefile.macosx and makefile.aix to scripts directory.
-version 1.0.9beta4 [December 1, 2000]
+
+Version 1.0.9beta4 [December 1, 2000]
   Change png_chunk_warning to png_warning in png_check_keyword().
   Increased the first part of msg buffer from 16 to 18 in png_chunk_error().
-version 1.0.9beta5 [December 15, 2000]
+
+Version 1.0.9beta5 [December 15, 2000]
   Added support for filter method 64 (for PNG datastreams embedded in MNG).
-version 1.0.9beta6 [December 18, 2000]
+
+Version 1.0.9beta6 [December 18, 2000]
   Revised png_set_filter() to accept filter method 64 when appropriate.
   Added new PNG_HAVE_PNG_SIGNATURE bit to png_ptr->mode and use it to
     help prevent applications from using MNG features in PNG datastreams.
   Added png_permit_mng_features() function.
   Revised libpng.3/libpng.txt.  Changed "filter type" to "filter method".
-version 1.0.9rc1 [December 23, 2000]
+
+Version 1.0.9rc1 [December 23, 2000]
   Revised test for PNG_HAVE_PNG_SIGNATURE in pngrutil.c
   Fixed error handling of unknown compression type in png_decompress_chunk().
   In pngconf.h, define __cdecl when _MSC_VER is defined.
-version 1.0.9beta7 [December 28, 2000]
+
+Version 1.0.9beta7 [December 28, 2000]
   Changed PNG_TEXT_COMPRESSION_zTXt to PNG_COMPRESSION_TYPE_BASE several places.
   Revised memory management in png_set_hIST and png_handle_hIST in a backward
     compatible manner.  PLTE and tRNS were revised similarly.
   Revised the iCCP chunk reader to ignore trailing garbage.
-version 1.0.9beta8 [January 12, 2001]
+
+Version 1.0.9beta8 [January 12, 2001]
   Moved pngasmrd.h into pngconf.h.
   Improved handling of out-of-spec garbage iCCP chunks generated by PhotoShop.
-version 1.0.9beta9 [January 15, 2001]
+
+Version 1.0.9beta9 [January 15, 2001]
   Added png_set_invalid, png_permit_mng_features, and png_mmx_supported to
     wince and msvc project module definition files.
   Minor revision of makefile.cygwin.
   Fixed bug with progressive reading of narrow interlaced images in pngpread.c
-version 1.0.9beta10 [January 16, 2001]
+
+Version 1.0.9beta10 [January 16, 2001]
   Do not typedef png_FILE_p in pngconf.h when PNG_NO_STDIO is defined.
   Fixed "png_mmx_supported" typo in project definition files.
-version 1.0.9beta11 [January 19, 2001]
+
+Version 1.0.9beta11 [January 19, 2001]
   Updated makefile.sgi to make shared library.
   Removed png_mmx_support() function and disabled PNG_MNG_FEATURES_SUPPORTED
     by default, for the benefit of DLL forward compatibility.  These will
     be re-enabled in version 1.2.0.
-version 1.0.9rc2 [January 22, 2001]
+
+Version 1.0.9rc2 [January 22, 2001]
   Revised cygwin support.
 
-version 1.0.9 [January 31, 2001]
+Version 1.0.9 [January 31, 2001]
   Added check of cygwin's ALL_STATIC in pngconf.h
   Added "-nommx" parameter to contrib/gregbook/rpng2-win and rpng2-x demos.
-version 1.0.10beta1 [March 14, 2001]
+
+Version 1.0.10beta1 [March 14, 2001]
   Revised makefile.dec, makefile.sgi, and makefile.sggcc; added makefile.hpgcc.
   Reformatted libpng.3 to eliminate bad line breaks.
   Added checks for _mmx_supported in the read_filter_row function of pnggccrd.c
@@ -963,33 +1053,39 @@
   Fixed bugs in png_combine_row() in pnggccrd.c and pngvcrd.c (C version)
   Added warnings when retrieving or setting gamma=0.
   Increased the first part of msg buffer from 16 to 18 in png_chunk_warning().
-version 1.0.10rc1 [March 23, 2001]
+
+Version 1.0.10rc1 [March 23, 2001]
   Changed all instances of memcpy, strcpy, and strlen to png_memcpy, png_strcpy,
     and png_strlen.
   Revised png_mmx_supported() function in pnggccrd.c to return proper value.
   Fixed bug in progressive reading (pngpread.c) with small images (height < 8).
 
-version 1.0.10 [March 30, 2001]
+Version 1.0.10 [March 30, 2001]
   Deleted extraneous space (introduced in 1.0.9) from line 42 of makefile.cygwin
   Added beos project files (Chris Herborth)
-version 1.0.11beta1 [April 3, 2001]
+
+Version 1.0.11beta1 [April 3, 2001]
   Added type casts on several png_malloc() calls (Dimitri Papadapoulos).
   Removed a no-longer needed AIX work-around from pngconf.h
   Changed several "//" single-line comments to C-style in pnggccrd.c
-version 1.0.11beta2 [April 11, 2001]
+
+Version 1.0.11beta2 [April 11, 2001]
   Removed PNGAPI from several functions whose prototypes did not have PNGAPI.
   Updated scripts/pngos2.def
-version 1.0.11beta3 [April 14, 2001]
+
+Version 1.0.11beta3 [April 14, 2001]
   Added checking the results of many instances of png_malloc() for NULL
-version 1.0.11beta4 [April 20, 2001]
+
+Version 1.0.11beta4 [April 20, 2001]
   Undid the changes from version 1.0.11beta3.  Added a check for NULL return
     from user's malloc_fn().
   Removed some useless type casts of the NULL pointer.
   Added makefile.netbsd
 
-version 1.0.11 [April 27, 2001]
+Version 1.0.11 [April 27, 2001]
   Revised makefile.netbsd
-version 1.0.12beta1 [May 14, 2001]
+
+Version 1.0.12beta1 [May 14, 2001]
   Test for Windows platform in pngconf.h when including malloc.h (Emmanuel Blot)
   Updated makefile.cygwin and handling of Cygwin's ALL_STATIC in pngconf.h
   Added some never-to-be-executed code in pnggccrd.c to quiet compiler warnings.
@@ -997,21 +1093,25 @@
     libpng will reallocate the png_struct and info_struct if they are too small.
     This retains future binary compatibility for old applications written for
     libpng-0.88 and earlier.
-version 1.2.0beta1 [May 6, 2001]
+
+Version 1.2.0beta1 [May 6, 2001]
   Bumped DLLNUM to 2.
   Re-enabled PNG_MNG_FEATURES_SUPPORTED and enabled PNG_ASSEMBLER_CODE_SUPPORTED
     by default.
   Added runtime selection of MMX features.
   Added png_set_strip_error_numbers function and related macros.
-version 1.2.0beta2 [May 7, 2001]
+
+Version 1.2.0beta2 [May 7, 2001]
   Finished merging 1.2.0beta1 with version 1.0.11
   Added a check for attempts to read or write PLTE in grayscale PNG datastreams.
-version 1.2.0beta3 [May 17, 2001]
+
+Version 1.2.0beta3 [May 17, 2001]
   Enabled user memory function by default.
   Modified png_create_struct so it passes user mem_ptr to user memory allocator.
   Increased png_mng_features flag from png_byte to png_uint_32.
   Bumped shared-library (so-number) and dll-number to 3.
-version 1.2.0beta4 [June 23, 2001]
+
+Version 1.2.0beta4 [June 23, 2001]
   Check for missing profile length field in iCCP chunk and free chunk_data
      in case of truncated iCCP chunk.
   Bumped shared-library number to 3 in makefile.sgi and makefile.sggcc
@@ -1025,7 +1125,8 @@
      of png_write_oFFS width and height from png_uint_32 to png_int_32.
   Updated example.c
   Revised prototypes for png_debug_malloc and png_debug_free in pngtest.c
-version 1.2.0beta5 [August 8, 2001]
+
+Version 1.2.0beta5 [August 8, 2001]
   Revised contrib/gregbook
   Revised makefile.gcmmx
   Revised pnggccrd.c to conditionally compile some thread-unsafe code only
@@ -1036,27 +1137,32 @@
   Replaced calls to fprintf(stderr,...) with png_warning() in pnggccrd.c
   Removed restriction that do_invert_mono only operate on 1-bit opaque files
 
-version 1.2.0 [September 1, 2001]
+Version 1.2.0 [September 1, 2001]
   Changed a png_warning() to png_debug() in pnggccrd.c
   Fixed contrib/gregbook/rpng-x.c, rpng2-x.c to avoid crash with XFreeGC().
-version 1.2.1beta1 [October 19, 2001]
+
+Version 1.2.1beta1 [October 19, 2001]
   Revised makefile.std in contrib/pngminus
   Include background_1 in png_struct regardless of gamma support.
   Revised makefile.netbsd and makefile.macosx, added makefile.darwin.
   Revised example.c to provide more details about using row_callback().
-version 1.2.1beta2 [October 25, 2001]
+
+Version 1.2.1beta2 [October 25, 2001]
   Added type cast to each NULL appearing in a function call, except for
     WINCE functions.
   Added makefile.so9.
-version 1.2.1beta3 [October 27, 2001]
+
+Version 1.2.1beta3 [October 27, 2001]
   Removed type casts from all NULLs.
   Simplified png_create_struct_2().
-version 1.2.1beta4 [November 7, 2001]
+
+Version 1.2.1beta4 [November 7, 2001]
   Revised png_create_info_struct() and png_creat_struct_2().
   Added error message if png_write_info() was omitted.
   Type cast NULLs appearing in function calls when _NO_PROTO or
     PNG_TYPECAST_NULL is defined.
-version 1.2.1rc1 [November 24, 2001]
+
+Version 1.2.1rc1 [November 24, 2001]
   Type cast NULLs appearing in function calls except when PNG_NO_TYPECAST_NULL
     is defined.
   Changed typecast of "size" argument to png_size_t in pngmem.c calls to
@@ -1065,14 +1171,16 @@
   Updated makefile.sgi to recognize LIBPATH and INCPATH.
   Updated various makefiles so "make clean" does not remove previous major
     version of the shared library.
-version 1.2.1rc2 [December 4, 2001]
+
+Version 1.2.1rc2 [December 4, 2001]
   Always allocate 256-entry internal palette, hist, and trans arrays, to
     avoid out-of-bounds memory reference caused by invalid PNG datastreams.
   Added a check for prefix_length > data_length in iCCP chunk handler.
 
-version 1.2.1 [December 7, 2001]
+Version 1.2.1 [December 7, 2001]
   None.
-version 1.2.2beta1 [February 22, 2002]
+
+Version 1.2.2beta1 [February 22, 2002]
   Fixed a bug with reading the length of iCCP profiles (Larry Reeves).
   Revised makefile.linux, makefile.gcmmx, and makefile.sgi to generate
     libpng.a, libpng12.so (not libpng.so.3), and libpng12/png.h
@@ -1082,13 +1190,15 @@
   Revised calls to png_create_read_struct() and png_create_write_struct()
     for simpler debugging.
   Revised png_zalloc() so zlib handles errors (uses PNG_FLAG_MALLOC_NULL_MEM_OK)
-version 1.2.2beta2 [February 23, 2002]
+
+Version 1.2.2beta2 [February 23, 2002]
   Check chunk_length and idat_size for invalid (over PNG_MAX_UINT) lengths.
   Check for invalid image dimensions in png_get_IHDR.
   Added missing "fi;" in the install target of the SGI makefiles.
   Added install-static to all makefiles that make shared libraries.
   Always do gamma compensation when image is partially transparent.
-version 1.2.2beta3 [March 7, 2002]
+
+Version 1.2.2beta3 [March 7, 2002]
   Compute background.gray and background_1.gray even when color_type is RGB
     in case image gets reduced to gray later.
   Modified shared-library makefiles to install pkgconfig/libpngNN.pc.
@@ -1098,12 +1208,14 @@
   Added install-shared target to all makefiles that make shared libraries.
   Stopped a double free of palette, hist, and trans when not using free_me.
   Added makefile.32sunu for Sun Ultra 32 and makefile.64sunu for Sun Ultra 64.
-version 1.2.2beta4 [March 8, 2002]
+
+Version 1.2.2beta4 [March 8, 2002]
   Compute background.gray and background_1.gray even when color_type is RGB
     in case image gets reduced to gray later (Jason Summers).
   Relocated a misplaced /bin/rm in the "install-shared" makefile targets
   Added PNG_1_0_X macro which can be used to build a 1.0.x-compatible library.
-version 1.2.2beta5 [March 26, 2002]
+
+Version 1.2.2beta5 [March 26, 2002]
   Added missing PNGAPI to several function definitions.
   Check for invalid bit_depth or color_type in png_get_IHDR(), and
     check for missing PLTE or IHDR in png_push_read_chunk() (Matthias Clasen).
@@ -1112,33 +1224,45 @@
   Changed "()" to "{}" in scripts/libpng.pc.in.
   Revised makefiles to put png.h and pngconf.h only in $prefix/include/libpngNN
   Revised makefiles to make symlink to libpng.so.NN in addition to libpngNN.so
-version 1.2.2beta6 [March 31, 2002]
-version 1.0.13beta1 [March 31, 2002]
+
+Version 1.2.2beta6 [March 31, 2002]
+
+Version 1.0.13beta1 [March 31, 2002]
   Prevent png_zalloc() from trying to memset memory that it failed to acquire.
   Add typecasts of PNG_MAX_UINT in pngset_cHRM_fixed() (Matt Holgate).
   Ensure that the right function (user or default) is used to free the
     png_struct after an error in png_create_read_struct_2().
-version 1.2.2rc1 [April 7, 2002]
-version 1.0.13rc1 [April 7, 2002]
+
+Version 1.2.2rc1 [April 7, 2002]
+
+Version 1.0.13rc1 [April 7, 2002]
   Save the ebx register in pnggccrd.c (Sami Farin)
   Add "mem_ptr = png_ptr->mem_ptr" in png_destroy_write_struct() (Paul Gardner).
   Updated makefiles to put headers in include/libpng and remove old include/*.h.
 
-version 1.2.2 [April 15, 2002]
-version 1.0.13 [April 15, 2002]
+Version 1.2.2 [April 15, 2002]
+
+Version 1.0.13 [April 15, 2002]
   Revised description of png_set_filter() in libpng.3/libpng.txt.
   Revised makefile.netbsd and added makefile.neNNbsd and makefile.freebsd
-version 1.0.13patch01 [April 17, 2002]
-version 1.2.2patch01 [April 17, 2002]
-  Changed ${PNGMAJ}.${PNGVER} bug to ${PNGVER} in makefile.sgi and makefile.sggcc
-  Fixed VER -> PNGVER typo in makefile.macosx and added install-static to install
+
+Version 1.0.13patch01 [April 17, 2002]
+
+Version 1.2.2patch01 [April 17, 2002]
+  Changed ${PNGMAJ}.${PNGVER} bug to ${PNGVER} in makefile.sgi and
+    makefile.sggcc
+  Fixed VER -> PNGVER typo in makefile.macosx and added install-static to
+    install
   Added install: target to makefile.32sunu and makefile.64sunu
-version 1.0.13patch03 [April 18, 2002]
-version 1.2.2patch03 [April 18, 2002]
+
+Version 1.0.13patch03 [April 18, 2002]
+
+Version 1.2.2patch03 [April 18, 2002]
   Revised 15 makefiles to link libpng.a to libpngNN.a and the include libpng
   subdirectory to libpngNN subdirectory without the full pathname.
   Moved generation of libpng.pc from "install" to "all" in 15 makefiles.
-version 1.2.3rc1 [April 28, 2002]
+
+Version 1.2.3rc1 [April 28, 2002]
   Added install-man target to 15 makefiles (Dimitri Papadopolous-Orfanos).
   Added $(DESTDIR) feature to 24 makefiles (Tim Mooney)
   Fixed bug with $prefix, should be $(prefix) in makefile.hpux.
@@ -1150,70 +1274,83 @@
     to put one in their application.
   Restored png_zalloc() and png_zfree() prototypes to version 1.2.1 and
     removed them from module definition files.
-version 1.2.3rc2 [May 1, 2002]
+
+Version 1.2.3rc2 [May 1, 2002]
   Fixed bug in reporting number of channels in pngget.c and pngset.c,
     that was introduced in version 1.2.2beta5.
   Exported png_zalloc(), png_zfree(), png_default_read(), png_default_write(),
     png_default_flush(), and png_push_fill_buffer() and included them in
     module definition files.
   Added "libpng.pc" dependency to the "install-shared" target in 15 makefiles.
-version 1.2.3rc3 [May 1, 2002]
+
+Version 1.2.3rc3 [May 1, 2002]
   Revised prototype for png_default_flush()
   Remove old libpng.pc and libpngNN.pc before installing new ones.
-version 1.2.3rc4 [May 2, 2002]
+
+Version 1.2.3rc4 [May 2, 2002]
   Typos in *.def files (png_default_read|write -> png_default_read|write_data)
   In makefiles, changed rm libpng.NN.pc to rm libpngNN.pc
-  Added libpng-config and libpngNN-config and modified makefiles to install them.
+  Added libpng-config and libpngNN-config and modified makefiles to install
+    them.
   Changed $(MANPATH) to $(DESTDIR)$(MANPATH) in makefiles
   Added "Win32 DLL VB" configuration to projects/msvc/libpng.dsp
-version 1.2.3rc5 [May 11, 2002]
+
+Version 1.2.3rc5 [May 11, 2002]
   Changed "error" and "message" in prototypes to "error_message" and
     "warning_message" to avoid namespace conflict.
   Revised 15 makefiles to build libpng-config from libpng-config-*.in
   Once more restored png_zalloc and png_zfree to regular nonexported form.
   Restored png_default_read|write_data, png_default_flush, png_read_fill_buffer
-    to nonexported form, but with PNGAPI, and removed them from module def files.
-version 1.2.3rc6 [May 14, 2002]
+    to nonexported form, but with PNGAPI, and removed them from module def
+    files.
+
+Version 1.2.3rc6 [May 14, 2002]
   Removed "PNGAPI" from png_zalloc() and png_zfree() in png.c
   Changed "Gz" to "Gd" in projects/msvc/libpng.dsp and zlib.dsp.
   Removed leftover libpng-config "sed" script from four makefiles.
   Revised libpng-config creating script in 16 makefiles.
 
-version 1.2.3 [May 22, 2002]
+Version 1.2.3 [May 22, 2002]
   Revised libpng-config target in makefile.cygwin.
   Removed description of png_set_mem_fn() from documentation.
   Revised makefile.freebsd.
   Minor cosmetic changes to 15 makefiles, e.g., $(DI) = $(DESTDIR)/$(INCDIR).
   Revised projects/msvc/README.txt
   Changed -lpng to -lpngNN in LDFLAGS in several makefiles.
-version 1.2.4beta1 [May 24, 2002]
+
+Version 1.2.4beta1 [May 24, 2002]
   Added libpng.pc and libpng-config to "all:" target in 16 makefiles.
   Fixed bug in 16 makefiles: $(DESTDIR)/$(LIBPATH) to $(DESTDIR)$(LIBPATH)
   Added missing "\" before closing double quote in makefile.gcmmx.
   Plugged various memory leaks; added png_malloc_warn() and png_set_text_2()
     functions.
-version 1.2.4beta2 [June 25, 2002]
+
+Version 1.2.4beta2 [June 25, 2002]
   Plugged memory leak of png_ptr->current_text (Matt Holgate).
   Check for buffer overflow before reading CRC in pngpread.c (Warwick Allison)
   Added -soname to the loader flags in makefile.dec, makefile.sgi, and
     makefile.sggcc.
   Added "test-installed" target to makefile.linux, makefile.gcmmx,
     makefile.sgi, and makefile.sggcc.
-version 1.2.4beta3 [June 28, 2002]
+
+Version 1.2.4beta3 [June 28, 2002]
   Plugged memory leak of row_buf in pngtest.c when there is a png_error().
   Detect buffer overflow in pngpread.c when IDAT is corrupted with extra data.
   Added "test-installed" target to makefile.32sunu, makefile.64sunu,
-    makefile.beos, makefile.darwin, makefile.dec, makefile.macosx, 
+    makefile.beos, makefile.darwin, makefile.dec, makefile.macosx,
     makefile.solaris, makefile.hpux, makefile.hpgcc, and makefile.so9.
-version 1.2.4rc1 and 1.0.14rc1 [July 2, 2002]
+
+Version 1.2.4rc1 and 1.0.14rc1 [July 2, 2002]
   Added "test-installed" target to makefile.cygwin and makefile.sco.
   Revised pnggccrd.c to be able to back out version 1.0.x via PNG_1_0_X macro.
 
-version 1.2.4 and 1.0.14 [July 8, 2002]
+Version 1.2.4 and 1.0.14 [July 8, 2002]
   Changed png_warning() to png_error() when width is too large to process.
-version 1.2.4patch01 [July 20, 2002]
+
+Version 1.2.4patch01 [July 20, 2002]
   Revised makefile.cygwin to use DLL number 12 instead of 13.
-version 1.2.5beta1 [August 6, 2002]
+
+Version 1.2.5beta1 [August 6, 2002]
   Added code to contrib/gregbook/readpng2.c to ignore unused chunks.
   Replaced toucan.png in contrib/gregbook (it has been corrupt since 1.0.11)
   Removed some stray *.o files from contrib/gregbook.
@@ -1222,36 +1359,43 @@
   Prevent png_ptr->pass from exceeding 7 in png_push_finish_row().
   Updated makefile.hpgcc
   Updated png.c and pnggccrd.c handling of return from png_mmx_support()
-version 1.2.5beta2 [August 15, 2002]
+
+Version 1.2.5beta2 [August 15, 2002]
   Only issue png_warning() about "Too much data" in pngpread.c when avail_in
     is nonzero.
   Updated makefiles to install a separate libpng.so.3 with its own rpath.
-version 1.2.5rc1 and 1.0.15rc1 [August 24, 2002]
+
+Version 1.2.5rc1 and 1.0.15rc1 [August 24, 2002]
   Revised makefiles to not remove previous minor versions of shared libraries.
-version 1.2.5rc2 and 1.0.15rc2 [September 16, 2002]
+
+Version 1.2.5rc2 and 1.0.15rc2 [September 16, 2002]
   Revised 13 makefiles to remove "-lz" and "-L$(ZLIBLIB)", etc., from shared
     library loader directive.
   Added missing "$OBJSDLL" line to makefile.gcmmx.
   Added missing "; fi" to makefile.32sunu.
-version 1.2.5rc3 and 1.0.15rc3 [September 18, 2002]
+
+Version 1.2.5rc3 and 1.0.15rc3 [September 18, 2002]
   Revised libpng-config script.
 
-version 1.2.5 and 1.0.15 [October 3, 2002]
+Version 1.2.5 and 1.0.15 [October 3, 2002]
   Revised makefile.macosx, makefile.darwin, makefile.hpgcc, and makefile.hpux,
     and makefile.aix.
   Relocated two misplaced PNGAPI lines in pngtest.c
-version 1.2.6beta1 [October 22, 2002]
+
+Version 1.2.6beta1 [October 22, 2002]
   Commented out warning about uninitialized mmx_support in pnggccrd.c.
   Changed "IBMCPP__" flag to "__IBMCPP__" in pngconf.h.
   Relocated two more misplaced PNGAPI lines in pngtest.c
   Fixed memory overrun bug in png_do_read_filler() with 16-bit datastreams,
     introduced in version 1.0.2.
   Revised makefile.macosx, makefile.dec, makefile.aix, and makefile.32sunu.
-version 1.2.6beta2 [November 1, 2002]
+
+Version 1.2.6beta2 [November 1, 2002]
   Added libpng-config "--ldopts" output.
   Added "AR=ar" and "ARFLAGS=rc" and changed "ar rc" to "$(AR) $(ARFLAGS)"
     in makefiles.
-version 1.2.6beta3 [July 18, 2004]
+
+Version 1.2.6beta3 [July 18, 2004]
   Reverted makefile changes from version 1.2.6beta2 and some of the changes
     from version 1.2.6beta1; these will be postponed until version 1.2.7.
     Version 1.2.6 is going to be a simple bugfix release.
@@ -1304,7 +1448,8 @@
   Updated contrib/visupng/VisualPng.dsp (Cosmin).
   Updated contrib/visupng/cexcept.h to version 2.0.0 (Cosmin).
   Added a separate distribution with "configure" and supporting files (Junichi).
-version 1.2.6beta4 [July 28, 2004]
+
+Version 1.2.6beta4 [July 28, 2004]
   Added user ability to change png_size_t via a PNG_SIZE_T macro.
   Added png_sizeof() and png_convert_size() functions.
   Added PNG_SIZE_MAX (maximum value of a png_size_t variable.
@@ -1324,9 +1469,10 @@
   Added PNG_NO_SEQUENTIAL_READ_SUPPORTED macro to conditionally remove
     sequential read support.
   Added some "#if PNG_WRITE_SUPPORTED" blocks.
-  #ifdef'ed out some redundancy in png_malloc_default().
+  Added #ifdef to remove some redundancy in png_malloc_default().
   Use png_malloc instead of png_zalloc to allocate the pallete.
-version 1.0.16rc1 and 1.2.6rc1 [August 4, 2004]
+
+Version 1.0.16rc1 and 1.2.6rc1 [August 4, 2004]
   Fixed buffer overflow vulnerability in png_handle_tRNS()
   Fixed integer arithmetic overflow vulnerability in png_read_png().
   Fixed some harmless bugs in png_handle_sBIT, etc, that would cause
@@ -1341,7 +1487,8 @@
   Fixed wrong cast of returns from png_get_user_width|height_max().
   Changed some "keep the compiler happy" from empty statements to returns,
   Revised libpng.txt to remove 1.2.x stuff from the 1.0.x distribution
-version 1.0.16rc2 and 1.2.6rc2 [August 7, 2004]
+
+Version 1.0.16rc2 and 1.2.6rc2 [August 7, 2004]
   Revised makefile.darwin and makefile.solaris.  Removed makefile.macosx.
   Revised pngtest's png_debug_malloc() to use png_malloc() instead of
     png_malloc_default() which is not supposed to be exported.
@@ -1355,90 +1502,106 @@
   Changed "HANDLE_CHUNK_*" to "PNG_HANDLE_CHUNK_*" (Cosmin)
   Added "-@/bin/rm -f $(DL)/$(LIBNAME).so.$(PNGMAJ)" to 15 *NIX makefiles.
   Added code to update the row_info->colortype in png_do_read_filler() (MSB).
-version 1.0.16rc3 and 1.2.6rc3 [August 9, 2004]
+
+Version 1.0.16rc3 and 1.2.6rc3 [August 9, 2004]
   Eliminated use of "abs()" in testing cHRM and gAMA values, to avoid
     trouble with some 64-bit compilers.  Created PNG_OUT_OF_RANGE() macro.
   Revised documentation of png_set_keep_unknown_chunks().
   Check handle_as_unknown status in pngpread.c, as in pngread.c previously.
   Moved  "PNG_HANDLE_CHUNK_*" macros out of PNG_INTERNAL section of png.h
   Added "rim" definitions for CONST4 and CONST6 in pnggccrd.c
-version 1.0.16rc4 and 1.2.6rc4 [August 10, 2004]
+
+Version 1.0.16rc4 and 1.2.6rc4 [August 10, 2004]
   Fixed mistake in pngtest.c introduced in 1.2.6rc2 (declaration of
     "pinfo" was out of place).
-version 1.0.16rc5 and 1.2.6rc5 [August 10, 2004]
+
+Version 1.0.16rc5 and 1.2.6rc5 [August 10, 2004]
   Moved  "PNG_HANDLE_CHUNK_*" macros out of PNG_ASSEMBLER_CODE_SUPPORTED
      section of png.h where they were inadvertently placed in version rc3.
 
-version 1.2.6 and 1.0.16 [August 15, 2004]
+Version 1.2.6 and 1.0.16 [August 15, 2004]
   Revised pngtest so memory allocation testing is only done when PNG_DEBUG==1.
-version 1.2.7beta1 [August 26, 2004]
+
+Version 1.2.7beta1 [August 26, 2004]
   Removed unused pngasmrd.h file.
   Removed references to uu.net for archived files.  Added references to
     PNG Spec (second edition) and the PNG ISO/IEC Standard.
   Added "test-dd" target in 15 makefiles, to run pngtest in DESTDIR.
   Fixed bug with "optimized window size" in the IDAT datastream, that
     causes libpng to write PNG files with incorrect zlib header bytes.
-version 1.2.7beta2 [August 28, 2004]
+
+Version 1.2.7beta2 [August 28, 2004]
   Fixed bug with sCAL chunk and big-endian machines (David Munro).
   Undid new code added in 1.2.6rc2 to update the color_type in
     png_set_filler().
   Added png_set_add_alpha() that updates color type.
-version 1.0.17rc1 and 1.2.7rc1 [September 4, 2004]
+
+Version 1.0.17rc1 and 1.2.7rc1 [September 4, 2004]
   Revised png_set_strip_filler() to not remove alpha if color_type has alpha.
 
-version 1.2.7 and 1.0.17 [September 12, 2004]
+Version 1.2.7 and 1.0.17 [September 12, 2004]
   Added makefile.hp64
   Changed projects/msvc/png32ms.def to scripts/png32ms.def in makefile.cygwin
-version 1.2.8beta1 [November 1, 2004]
+
+Version 1.2.8beta1 [November 1, 2004]
   Fixed bug in png_text_compress() that would fail to complete a large block.
   Fixed bug, introduced in libpng-1.2.7, that overruns a buffer during
     strip alpha operation in png_do_strip_filler().
   Added PNG_1_2_X definition in pngconf.h
-  #ifdef out png_info_init in png.c and png_read_init in pngread.c (as of 1.3.0)
-version 1.2.8beta2 [November 2, 2004]
+  Use #ifdef to comment out png_info_init in png.c and png_read_init in
+    pngread.c (as of 1.3.0)
+
+Version 1.2.8beta2 [November 2, 2004]
   Reduce color_type to a nonalpha type after strip alpha operation in
     png_do_strip_filler().
-version 1.2.8beta3 [November 3, 2004]
+
+Version 1.2.8beta3 [November 3, 2004]
   Revised definitions of PNG_MAX_UINT_32, PNG_MAX_SIZE, and PNG_MAXSUM
-version 1.2.8beta4 [November 12, 2004]
+
+Version 1.2.8beta4 [November 12, 2004]
   Fixed (again) definition of PNG_LIBPNG_VER_DLLNUM in png.h (Cosmin).
   Added PNG_LIBPNG_BUILD_PRIVATE in png.h (Cosmin).
   Set png_ptr->zstream.data_type to Z_BINARY, to avoid unnecessary detection
     of data type in deflate (Cosmin).
   Deprecated but continue to support SPECIALBUILD and PRIVATEBUILD in favor of
     PNG_LIBPNG_BUILD_SPECIAL_STRING and PNG_LIBPNG_BUILD_PRIVATE_STRING.
-version 1.2.8beta5 [November 20, 2004]
+
+Version 1.2.8beta5 [November 20, 2004]
   Use png_ptr->flags instead of png_ptr->transformations to pass
     PNG_STRIP_ALPHA info to png_do_strip_filler(), to preserve ABI
     compatibility.
-  Revised handling of SPECIALBUILD, PRIVATEBUILD, 
+  Revised handling of SPECIALBUILD, PRIVATEBUILD,
     PNG_LIBPNG_BUILD_SPECIAL_STRING and PNG_LIBPNG_BUILD_PRIVATE_STRING.
-version 1.2.8rc1 [November 24, 2004]
+
+Version 1.2.8rc1 [November 24, 2004]
   Moved handling of BUILD macros from pngconf.h to png.h
   Added definition of PNG_LIBPNG_BASE_TYPE in png.h, inadvertently
     omitted from beta5.
   Revised scripts/pngw32.rc
   Despammed mailing addresses by masking "@" with "at".
   Inadvertently installed a supposedly faster test version of pngrutil.c
-version 1.2.8rc2 [November 26, 2004]
+
+Version 1.2.8rc2 [November 26, 2004]
   Added two missing "\" in png.h
   Change tests in pngread.c and pngpread.c to
     if (png_ptr->transformations || (png_ptr->flags&PNG_FLAG_STRIP_ALPHA))
        png_do_read_transformations(png_ptr);
-version 1.2.8rc3 [November 28, 2004]
+
+Version 1.2.8rc3 [November 28, 2004]
   Reverted pngrutil.c to version libpng-1.2.8beta5.
   Added scripts/makefile.elf with supporting code in pngconf.h for symbol
     versioning (John Bowler).
-version 1.2.8rc4 [November 29, 2004]
+
+Version 1.2.8rc4 [November 29, 2004]
   Added projects/visualc7 (Simon-pierre).
-version 1.2.8rc5 [November 29, 2004]
+
+Version 1.2.8rc5 [November 29, 2004]
   Fixed new typo in scripts/pngw32.rc
 
-version 1.2.8 [December 3, 2004]
+Version 1.2.8 [December 3, 2004]
   Removed projects/visualc7, added projects/visualc71.
 
-version 1.2.9beta1 [February 21, 2006]
-
+Version 1.2.9beta1 [February 21, 2006]
   Initialized some structure members in pngwutil.c to avoid gcc-4.0.0 complaints
   Revised man page and libpng.txt to make it clear that one should not call
     png_read_end or png_write_end after png_read_png or png_write_png.
@@ -1460,8 +1623,7 @@
   Fixed scripts/makefile.cygwin (Christian Biesinger, Cosmin).
   Default iTXt support was inadvertently enabled.
 
-version 1.2.9beta2 [February 21, 2006]
-
+Version 1.2.9beta2 [February 21, 2006]
   Check for png_rgb_to_gray and png_gray_to_rgb read transformations before
     checking for png_read_dither in pngrtran.c
   Revised checking of chromaticity limits to accommodate extended RGB
@@ -1474,8 +1636,7 @@
   Eliminated distributions without the "configure" script.
   Updated INSTALL instructions.
 
-version 1.2.9beta3 [February 24, 2006]
-
+Version 1.2.9beta3 [February 24, 2006]
   Fixed CRCRLF line endings in contrib/visupng/VisualPng.dsp
   Made libpng.pc respect EXEC_PREFIX (D. P. Kreil, J. Bowler)
   Removed reference to pngasmrd.h from Makefile.am
@@ -1484,8 +1645,7 @@
   Renamed ANNOUNCE to NEWS.
   Created AUTHORS file.
 
-version 1.2.9beta4 [March 3, 2006]
-
+Version 1.2.9beta4 [March 3, 2006]
   Changed definition of PKGCONFIG from $prefix/lib to $libdir in configure.ac
   Reverted to filenames LICENSE and ANNOUNCE; removed AUTHORS and COPYING.
   Removed newline from the end of some error and warning messages.
@@ -1496,17 +1656,17 @@
   Added "OS2" to list of systems that don't need underscores, in pnggccrd.c
   Removed libpng version and date from *.c files.
 
-version 1.2.9beta5 [March 4, 2006]
+Version 1.2.9beta5 [March 4, 2006]
   Removed trailing blanks from source files.
   Put version and date of latest change in each source file, and changed
     copyright year accordingly.
-  More cleanup of configure.ac, Makefile.ac, and associated scripts.
+  More cleanup of configure.ac, Makefile.am, and associated scripts.
   Restored scripts/makefile.elf which was inadvertently deleted.
 
-version 1.2.9beta6 [March 6, 2006]
-  Fixed typo (18) in configuration files.
-
-version 1.2.9beta7 [March 7, 2006]
+Version 1.2.9beta6 [March 6, 2006]
+  Fixed typo (RELEASE) in configuration files.
+
+Version 1.2.9beta7 [March 7, 2006]
   Removed libpng.vers and libpng.sym from libpng12_la_SOURCES in Makefile.am
   Fixed inconsistent #ifdef's around png_sig_bytes() and png_set_sCAL_s()
     in png.h.
@@ -1514,7 +1674,7 @@
   Made cosmetic changes to some makefiles, adding LN_SF and other macros.
   Made some makefiles accept "exec_prefix".
 
-version 1.2.9beta8 [March 9, 2006]
+Version 1.2.9beta8 [March 9, 2006]
   Fixed some "#if defined (..." which should be "#if defined(..."
     Bug introduced in libpng-1.2.8.
   Fixed inconsistency in definition of png_default_read_data()
@@ -1525,82 +1685,82 @@
   Added png_set_expand_gray_1_2_4_to_8() and deprecated
     png_set_gray_1_2_4_to_8() which also expands tRNS to alpha.
 
-version 1.2.9beta9 [March 10, 2006]
+Version 1.2.9beta9 [March 10, 2006]
   Include "config.h" in pngconf.h when available.
   Added some checks for NULL png_ptr or NULL info_ptr (timeless)
 
-version 1.2.9beta10 [March 20, 2006]
+Version 1.2.9beta10 [March 20, 2006]
   Removed extra CR from contrib/visualpng/VisualPng.dsw (Cosmin)
   Made pnggccrd.c PIC-compliant (Christian Aichinger).
   Added makefile.mingw (Wolfgang Glas).
   Revised pngconf.h MMX checking.
 
-version 1.2.9beta11 [March 22, 2006]
+Version 1.2.9beta11 [March 22, 2006]
   Fixed out-of-order declaration in pngwrite.c that was introduced in beta9
   Simplified some makefiles by using LIBSO, LIBSOMAJ, and LIBSOVER macros.
 
-version 1.2.9rc1 [March 31, 2006]
+Version 1.2.9rc1 [March 31, 2006]
   Defined PNG_USER_PRIVATEBUILD when including "pngusr.h" (Cosmin).
   Removed nonsensical assertion check from pngtest.c (Cosmin).
 
-version 1.2.9 [April 14, 2006]
+Version 1.2.9 [April 14, 2006]
   Revised makefile.beos and added "none" selector in ltmain.sh
 
-version 1.2.10beta1 [April 15, 2006]
+Version 1.2.10beta1 [April 15, 2006]
   Renamed "config.h" to "png_conf.h" and revised Makefile.am to add
     -DPNG_BUILDING_LIBPNG to compile directive, and modified pngconf.h
     to include png_conf.h only when PNG_BUILDING_LIBPNG is defined.
 
-version 1.2.10beta2 [April 15, 2006]
+Version 1.2.10beta2 [April 15, 2006]
   Manually updated Makefile.in and configure.  Changed png_conf.h.in
     back to config.h.
 
-version 1.2.10beta3 [April 15, 2006]
+Version 1.2.10beta3 [April 15, 2006]
   Change png_conf.h back to config.h in pngconf.h.
 
-version 1.2.10beta4 [April 16, 2006]
+Version 1.2.10beta4 [April 16, 2006]
   Change PNG_BUILDING_LIBPNG to PNG_CONFIGURE_LIBPNG in config/Makefile*.
 
-version 1.2.10beta5 [April 16, 2006]
+Version 1.2.10beta5 [April 16, 2006]
   Added a configure check for compiling assembler code in pnggccrd.c
 
-version 1.2.10beta6 [April 17, 2006]
+Version 1.2.10beta6 [April 17, 2006]
   Revised the configure check for pnggccrd.c
   Moved -DPNG_CONFIGURE_LIBPNG into @LIBPNG_DEFINES@
   Added @LIBPNG_DEFINES@ to arguments when building libpng.sym
 
-version 1.2.10beta7 [April 18, 2006]
+Version 1.2.10beta7 [April 18, 2006]
   Change "exec_prefix=$prefix" to "exec_prefix=$(prefix)" in makefiles.
 
-version 1.2.10rc1 [April 19, 2006]
+Version 1.2.10rc1 [April 19, 2006]
   Ensure pngconf.h doesn't define both PNG_USE_PNGGCCRD and PNG_USE_PNGVCRD
   Fixed "LN_FS" typo in makefile.sco and makefile.solaris.
 
-version 1.2.10rc2 [April 20, 2006]
+Version 1.2.10rc2 [April 20, 2006]
   Added a backslash between -DPNG_CONFIGURE_LIBPNG and -DPNG_NO_ASSEMBLER_CODE
    in configure.ac and configure
   Made the configure warning about versioned symbols less arrogant.
 
-version 1.2.10rc3 [April 21, 2006]
+Version 1.2.10rc3 [April 21, 2006]
   Added a note in libpng.txt that png_set_sig_bytes(8) can be used when
     writing an embedded PNG without the 8-byte signature.
   Revised makefiles and configure to avoid making links to libpng.so.*
 
-version 1.2.10 [April 23, 2006]
+Version 1.2.10 [April 23, 2006]
   Reverted configure to "rc2" state.
 
-version 1.2.11beta1 [May 31, 2006]
+Version 1.2.11beta1 [May 31, 2006]
   scripts/libpng.pc.in contained "configure" style version info and would
     not work with makefiles.
   The shared-library makefiles were linking to libpng.so.0 instead of
     libpng.so.3 compatibility as the library.
 
-version 1.2.11beta2 [June 2, 2006]
+Version 1.2.11beta2 [June 2, 2006]
   Increased sprintf buffer from 50 to 52 chars in pngrutil.c to avoid
     buffer overflow.
   Fixed bug in example.c (png_set_palette_rgb -> png_set_palette_to_rgb)
 
-version 1.2.11beta3 [June 5, 2006]
+Version 1.2.11beta3 [June 5, 2006]
   Prepended "#! /bin/sh" to ltmail.sh and contrib/pngminus/*.sh (Cosmin).
   Removed the accidental leftover Makefile.in~ (Cosmin).
   Avoided potential buffer overflow and optimized buffer in
@@ -1608,116 +1768,116 @@
   Removed the include directories and libraries from CFLAGS and LDFLAGS
     in scripts/makefile.gcc (Nelson A. de Oliveira, Cosmin).
 
-version 1.2.11beta4 [June 6, 2006]
+Version 1.2.11beta4 [June 6, 2006]
   Allow zero-length IDAT chunks after the entire zlib datastream, but not
     after another intervening chunk type.
 
-version 1.0.19rc1, 1.2.11rc1 [June 13, 2006]
+Version 1.0.19rc1, 1.2.11rc1 [June 13, 2006]
   Deleted extraneous square brackets from [config.h] in configure.ac
 
-version 1.0.19rc2, 1.2.11rc2 [June 14, 2006]
+Version 1.0.19rc2, 1.2.11rc2 [June 14, 2006]
   Added prototypes for PNG_INCH_CONVERSIONS functions to png.h
   Revised INSTALL and autogen.sh
   Fixed typo in several makefiles (-W1 should be -Wl)
   Added typedef for png_int_32 and png_uint_32 on 64-bit systems.
 
-version 1.0.19rc3, 1.2.11rc3 [June 15, 2006]
+Version 1.0.19rc3, 1.2.11rc3 [June 15, 2006]
   Removed the new typedefs for 64-bit systems (delay until version 1.4.0)
   Added one zero element to png_gamma_shift[] array in pngrtran.c to avoid
     reading out of bounds.
 
-version 1.0.19rc4, 1.2.11rc4 [June 15, 2006]
+Version 1.0.19rc4, 1.2.11rc4 [June 15, 2006]
   Really removed the new typedefs for 64-bit systems.
 
-version 1.0.19rc5, 1.2.11rc5 [June 22, 2006]
+Version 1.0.19rc5, 1.2.11rc5 [June 22, 2006]
   Removed png_sig_bytes entry from scripts/pngw32.def
 
-version 1.0.19, 1.2.11 [June 26, 2006]
+Version 1.0.19, 1.2.11 [June 26, 2006]
   None.
 
-version 1.0.20, 1.2.12 [June 27, 2006]
+Version 1.0.20, 1.2.12 [June 27, 2006]
   Really increased sprintf buffer from 50 to 52 chars in pngrutil.c to avoid
     buffer overflow.
 
-version 1.2.13beta1 [October 2, 2006]
+Version 1.2.13beta1 [October 2, 2006]
   Removed AC_FUNC_MALLOC from configure.ac
   Work around Intel-Mac compiler bug by setting PNG_NO_MMX_CODE in pngconf.h
   Change "logical" to "bitwise" throughout documentation.
   Detect and fix attempt to write wrong iCCP profile length.
 
-version 1.0.21, 1.2.13 [November 14, 2006]
+Version 1.0.21, 1.2.13 [November 14, 2006]
   Fix potential buffer overflow in sPLT chunk handler.
   Fix Makefile.am to not try to link to noexistent files.
   Check all exported functions for NULL png_ptr.
 
-version 1.2.14beta1 [November 17, 2006]
+Version 1.2.14beta1 [November 17, 2006]
   Relocated three misplaced tests for NULL png_ptr.
   Built Makefile.in with automake-1.9.6 instead of 1.9.2.
   Build configure with autoconf-2.60 instead of 2.59
 
-version 1.2.14beta2 [November 17, 2006]
+Version 1.2.14beta2 [November 17, 2006]
   Added some typecasts in png_zalloc().
 
-version 1.2.14rc1 [November 20, 2006]
+Version 1.2.14rc1 [November 20, 2006]
   Changed "strtod" to "png_strtod" in pngrutil.c
 
-version 1.0.22, 1.2.14    [November 27, 2006]
+Version 1.0.22, 1.2.14    [November 27, 2006]
   Added missing "$(srcdir)" in Makefile.am and Makefile.in
 
-version 1.2.15beta1 [December 3, 2006]
+Version 1.2.15beta1 [December 3, 2006]
   Generated configure with autoconf-2.61 instead of 2.60
   Revised configure.ac to update libpng.pc and libpng-config.
 
-version 1.2.15beta2 [December 3, 2006]
+Version 1.2.15beta2 [December 3, 2006]
   Always export MMX asm functions, just stubs if not building pnggccrd.c
 
-version 1.2.15beta3 [December 4, 2006]
+Version 1.2.15beta3 [December 4, 2006]
   Add "png_bytep" typecast to profile while calculating length in pngwutil.c
 
-version 1.2.15beta4 [December 7, 2006]
+Version 1.2.15beta4 [December 7, 2006]
   Added scripts/CMakeLists.txt
   Changed PNG_NO_ASSEMBLER_CODE to PNG_NO_MMX_CODE in scripts, like 1.4.0beta
 
-version 1.2.15beta5 [December 7, 2006]
+Version 1.2.15beta5 [December 7, 2006]
   Changed some instances of PNG_ASSEMBLER_* to PNG_MMX_* in pnggccrd.c
   Revised scripts/CMakeLists.txt
 
-version 1.2.15beta6 [December 13, 2006]
+Version 1.2.15beta6 [December 13, 2006]
   Revised scripts/CMakeLists.txt and configure.ac
 
-version 1.2.15rc1 [December 18, 2006]
+Version 1.2.15rc1 [December 18, 2006]
   Revised scripts/CMakeLists.txt
 
-version 1.2.15rc2 [December 21, 2006]
+Version 1.2.15rc2 [December 21, 2006]
   Added conditional #undef jmpbuf in pngtest.c to undo #define in AIX headers.
   Added scripts/makefile.nommx
 
-version 1.2.15rc3 [December 25, 2006]
-  Fixed shared library numbering error that was intruduced in 1.2.15beta6.
-
-version 1.2.15rc4 [December 27, 2006]
+Version 1.2.15rc3 [December 25, 2006]
+  Fixed shared library numbering error that was introduced in 1.2.15beta6.
+
+Version 1.2.15rc4 [December 27, 2006]
   Fixed handling of rgb_to_gray when png_ptr->color.gray isn't set.
 
-version 1.2.15rc5 [December 31, 2006]
+Version 1.2.15rc5 [December 31, 2006]
   Revised handling of rgb_to_gray.
 
-version 1.2.15 [January 5, 2007]
+Version 1.2.15 [January 5, 2007]
   Added some (unsigned long) typecasts in pngtest.c to avoid printing errors.
 
-version 1.2.16beta1 [January 6, 2007]
+Version 1.2.16beta1 [January 6, 2007]
   Fix bugs in makefile.nommx
 
-version 1.2.16beta2 [January 16, 2007]
+Version 1.2.16beta2 [January 16, 2007]
   Revised scripts/CMakeLists.txt
- 
-version 1.2.16 [January 31, 2007]
+
+Version 1.2.16 [January 31, 2007]
   No changes.
- 
-version 1.2.17beta1 [March 6, 2007]
+
+Version 1.2.17beta1 [March 6, 2007]
   Revised scripts/CMakeLists.txt to install both shared and static libraries.
   Deleted a redundant line from pngset.c.
- 
-version 1.2.17beta2 [April 26, 2007]
+
+Version 1.2.17beta2 [April 26, 2007]
   Relocated misplaced test for png_ptr == NULL in pngpread.c
   Change "==" to "&" for testing PNG_RGB_TO_GRAY_ERR & PNG_RGB_TO_GRAY_WARN
     flags.
@@ -1726,10 +1886,10 @@
   Added "const" to some array declarations.
   Mention examples of libpng usage in the libpng*.txt and libpng.3 documents.
 
-version 1.2.17rc1 [May 4, 2007]
+Version 1.2.17rc1 [May 4, 2007]
   No changes.
 
-version 1.2.17rc2 [May 8, 2007]
+Version 1.2.17rc2 [May 8, 2007]
   Moved several PNG_HAVE_* macros out of PNG_INTERNAL because applications
     calling set_unknown_chunk_location() need them.
   Changed transformation flag from PNG_EXPAND_tRNS to PNG_EXPAND in
@@ -1737,22 +1897,1642 @@
   Added png_ptr->unknown_chunk to hold working unknown chunk data, so it
     can be free'ed in case of error.  Revised unknown chunk handling in
     pngrutil.c and pngpread.c to use this structure.
- 
-version 1.2.17rc3 [May 8, 2007]
+
+Version 1.2.17rc3 [May 8, 2007]
   Revised symbol-handling in configure script.
 
-version 1.2.17rc4 [May 10, 2007]
+Version 1.2.17rc4 [May 10, 2007]
   Revised unknown chunk handling to avoid storing unknown critical chunks.
 
-version 1.0.25 [May 15, 2007]
-version 1.2.17 [May 15, 2007]
+Version 1.0.25 [May 15, 2007]
+Version 1.2.17 [May 15, 2007]
   Added "png_ptr->num_trans=0" before error return in png_handle_tRNS,
-    to eliminate a vulnerability (CVE-2007-2554, CERT VU#684664)
-
-version 1.0.26 [May 15, 2007]
-version 1.2.18 [May 15, 2007]
+    to eliminate a vulnerability (CVE-2007-2445, CERT VU#684664)
+
+Version 1.0.26 [May 15, 2007]
+Version 1.2.18 [May 15, 2007]
   Reverted the libpng-1.2.17rc3 change to symbol-handling in configure script
 
+Version 1.2.19beta1 [May 18, 2007]
+  Changed "const static" to "static PNG_CONST" everywhere, mostly undoing
+    change of libpng-1.2.17beta2.  Changed other "const" to "PNG_CONST"
+  Changed some handling of unused parameters, to avoid compiler warnings.
+    "if (unused == NULL) return;" becomes "unused = unused".
+
+Version 1.2.19beta2 [May 18, 2007]
+  Only use the valid bits of tRNS value in png_do_expand() (Brian Cartier)
+
+Version 1.2.19beta3 [May 19, 2007]
+  Add some "png_byte" typecasts in png_check_keyword() and write new_key
+  instead of key in zTXt chunk (Kevin Ryde).
+
+Version 1.2.19beta4 [May 21, 2007]
+  Add png_snprintf() function and use it in place of sprint() for improved
+    defense against buffer overflows.
+
+Version 1.2.19beta5 [May 21, 2007]
+  Fixed png_handle_tRNS() to only use the valid bits of tRNS value.
+  Changed handling of more unused parameters, to avoid compiler warnings.
+  Removed some PNG_CONST in pngwutil.c to avoid compiler warnings.
+
+Version 1.2.19beta6 [May 22, 2007]
+  Added some #ifdef PNG_MMX_CODE_SUPPORTED where needed in pngvcrd.c
+  Added a special "_MSC_VER" case that defines png_snprintf to _snprintf
+
+Version 1.2.19beta7 [May 22, 2007]
+  Squelched png_squelch_warnings() in pnggccrd.c and added
+    an #ifdef PNG_MMX_CODE_SUPPORTED block around the declarations that caused
+    the warnings that png_squelch_warnings was squelching.
+
+Version 1.2.19beta8 [May 22, 2007]
+  Removed __MMX__ from test in pngconf.h.
+
+Version 1.2.19beta9 [May 23, 2007]
+  Made png_squelch_warnings() available via PNG_SQUELCH_WARNINGS macro.
+  Revised png_squelch_warnings() so it might work.
+  Updated makefile.sgcc and makefile.solaris; added makefile.solaris-x86.
+
+Version 1.2.19beta10 [May 24, 2007]
+  Resquelched png_squelch_warnings(), use "__attribute__((used))" instead.
+
+Version 1.4.0beta1 [April 20, 2006]
+  Enabled iTXt support (changes png_struct, thus requires so-number change).
+  Cleaned up PNG_ASSEMBLER_CODE_SUPPORTED vs PNG_MMX_CODE_SUPPORTED
+  Eliminated PNG_1_0_X and PNG_1_2_X macros.
+  Removed deprecated functions png_read_init, png_write_init, png_info_init,
+    png_permit_empty_plte, png_set_gray_1_2_4_to_8, png_check_sig, and
+    removed the deprecated macro PNG_MAX_UINT.
+  Moved "PNG_INTERNAL" parts of png.h and pngconf.h into pngintrn.h
+  Removed many WIN32_WCE #ifdefs (Cosmin).
+  Reduced dependency on C-runtime library when on Windows (Simon-Pierre)
+  Replaced sprintf() with png_sprintf() (Simon-Pierre)
+
+Version 1.4.0beta2 [April 20, 2006]
+  Revised makefiles and configure to avoid making links to libpng.so.*
+  Moved some leftover MMX-related defines from pngconf.h to pngintrn.h
+  Updated scripts/pngos2.def, pngw32.def, and projects/wince/png32ce.def
+
+Version 1.4.0beta3 [May 10, 2006]
+  Updated scripts/pngw32.def to comment out MMX functions.
+  Added PNG_NO_GET_INT_32 and PNG_NO_SAVE_INT_32 macros.
+  Scripts/libpng.pc.in contained "configure" style version info and would
+    not work with makefiles.
+  Revised pngconf.h and added pngconf.h.in, so makefiles and configure can
+    pass defines to libpng and applications.
+
+Version 1.4.0beta4 [May 11, 2006]
+  Revised configure.ac, Makefile.am, and many of the makefiles to write
+    their defines in pngconf.h.
+
+Version 1.4.0beta5 [May 15, 2006]
+  Added a missing semicolon in Makefile.am and Makefile.in
+  Deleted extraneous square brackets from configure.ac
+
+Version 1.4.0beta6 [June 2, 2006]
+  Increased sprintf buffer from 50 to 52 chars in pngrutil.c to avoid
+    buffer overflow.
+  Changed sonum from 0 to 1.
+  Removed unused prototype for png_check_sig() from png.h
+
+Version 1.4.0beta7 [June 16, 2006]
+  Exported png_write_sig (Cosmin).
+  Optimized buffer in png_handle_cHRM() (Cosmin).
+  Set pHYs = 2835 x 2835 pixels per meter, and added
+    sCAL = 0.352778e-3 x 0.352778e-3 meters, in pngtest.png (Cosmin).
+  Added png_set_benign_errors(), png_benign_error(), png_chunk_benign_error().
+  Added typedef for png_int_32 and png_uint_32 on 64-bit systems.
+  Added "(unsigned long)" typecast on png_uint_32 variables in printf lists.
+
+Version 1.4.0beta8 [June 22, 2006]
+  Added demonstration of user chunk support in pngtest.c, to support the
+    public sTER chunk and a private vpAg chunk.
+
+Version 1.4.0beta9 [July 3, 2006]
+  Removed ordinals from scripts/pngw32.def and removed png_info_int and
+    png_set_gray_1_2_4_to_8 entries.
+  Inline call of png_get_uint_32() in png_get_uint_31().
+  Use png_get_uint_31() to get vpAg width and height in pngtest.c
+  Removed WINCE and Netware projects.
+  Removed standalone Y2KINFO file.
+
+Version 1.4.0beta10 [July 12, 2006]
+  Eliminated automatic copy of pngconf.h to pngconf.h.in from configure and
+    some makefiles, because it was not working reliably.  Instead, distribute
+    pngconf.h.in along with pngconf.h and cause configure and some of the
+    makefiles to update pngconf.h from pngconf.h.in.
+  Added pngconf.h to DEPENDENCIES in Makefile.am
+
+Version 1.4.0beta11 [August 19, 2006]
+  Removed AC_FUNC_MALLOC from configure.ac.
+  Added a warning when writing iCCP profile with mismatched profile length.
+  Patched pnggccrd.c to assemble on x86_64 platforms.
+  Moved chunk header reading into a separate function png_read_chunk_header()
+    in pngrutil.c.  The chunk header (len+sig) is now serialized in a single
+    operation (Cosmin).
+  Implemented support for I/O states. Added png_ptr member io_state, and
+    functions png_get_io_chunk_name() and png_get_io_state() in pngget.c
+    (Cosmin).
+  Added png_get_io_chunk_name and png_get_io_state to scripts/*.def (Cosmin).
+  Renamed scripts/pngw32.* to scripts/pngwin.* (Cosmin).
+  Removed the include directories and libraries from CFLAGS and LDFLAGS
+    in scripts/makefile.gcc (Cosmin).
+  Used png_save_uint_32() to set vpAg width and height in pngtest.c (Cosmin).
+  Cast to proper type when getting/setting vpAg units in pngtest.c (Cosmin).
+  Added pngintrn.h to the Visual C++ projects (Cosmin).
+  Removed scripts/list (Cosmin).
+  Updated copyright year in scripts/pngwin.def (Cosmin).
+  Removed PNG_TYPECAST_NULL and used standard NULL consistently (Cosmin).
+  Disallowed the user to redefine png_size_t, and enforced a consistent use
+    of png_size_t across libpng (Cosmin).
+  Changed the type of png_ptr->rowbytes, PNG_ROWBYTES() and friends
+    to png_size_t (Cosmin).
+  Removed png_convert_size() and replaced png_sizeof with sizeof (Cosmin).
+  Removed some unnecessary type casts (Cosmin).
+  Changed prototype of png_get_compression_buffer_size() and
+    png_set_compression_buffer_size() to work with png_size_t instead of
+    png_uint_32 (Cosmin).
+  Removed png_memcpy_check() and png_memset_check() (Cosmin).
+  Fixed a typo (png_byte --> png_bytep) in libpng.3 and libpng.txt (Cosmin).
+  Clarified that png_zalloc() does not clear the allocated memory,
+    and png_zalloc() and png_zfree() cannot be PNGAPI (Cosmin).
+  Renamed png_mem_size_t to png_alloc_size_t, fixed its definition in
+    pngconf.h, and used it in all memory allocation functions (Cosmin).
+  Renamed pngintrn.h to pngpriv.h, added a comment at the top of the file
+    mentioning that the symbols declared in that file are private, and
+    updated the scripts and the Visual C++ projects accordingly (Cosmin).
+  Removed circular references between pngconf.h and pngconf.h.in in
+    scripts/makefile.vc*win32 (Cosmin).
+  Removing trailing '.' from the warning and error messages (Cosmin).
+  Added pngdefs.h that is built by makefile or configure, instead of
+    pngconf.h.in (Glenn).
+  Detect and fix attempt to write wrong iCCP profile length.
+
+Version 1.4.0beta12 [October 19, 2006]
+  Changed "logical" to "bitwise" in the documentation.
+  Work around Intel-Mac compiler bug by setting PNG_NO_MMX_CODE in pngconf.h
+  Add a typecast to stifle compiler warning in pngrutil.c
+
+Version 1.4.0beta13 [November 10, 2006]
+  Fix potential buffer overflow in sPLT chunk handler.
+  Fix Makefile.am to not try to link to noexistent files.
+
+Version 1.4.0beta14 [November 15, 2006]
+  Check all exported functions for NULL png_ptr.
+
+Version 1.4.0beta15 [November 17, 2006]
+  Relocated two misplaced tests for NULL png_ptr.
+  Built Makefile.in with automake-1.9.6 instead of 1.9.2.
+  Build configure with autoconf-2.60 instead of 2.59
+  Add "install: all" in Makefile.am so "configure; make install" will work.
+
+Version 1.4.0beta16 [November 17, 2006]
+  Added a typecast in png_zalloc().
+
+Version 1.4.0beta17 [December 4, 2006]
+  Changed "new_key[79] = '\0';" to "(*new_key)[79] = '\0';" in pngwutil.c
+  Add "png_bytep" typecast to profile while calculating length in pngwutil.c
+
+Version 1.4.0beta18 [December 7, 2006]
+  Added scripts/CMakeLists.txt
+
+Version 1.4.0beta19 [May 16, 2007]
+  Revised scripts/CMakeLists.txt
+  Rebuilt configure and Makefile.in with newer tools.
+  Added conditional #undef jmpbuf in pngtest.c to undo #define in AIX headers.
+  Added scripts/makefile.nommx
+
+Version 1.4.0beta20 [July 9, 2008]
+  Moved several PNG_HAVE_* macros from pngpriv.h to png.h because applications
+    calling set_unknown_chunk_location() need them.
+  Moved several macro definitions from pngpriv.h to pngconf.h
+  Merge with changes to the 1.2.X branch, as of 1.2.30beta04.
+  Deleted all use of the MMX assembler code and Intel-licensed optimizations.
+  Revised makefile.mingw
+
+Version 1.4.0beta21 [July 21, 2008]
+  Moved local array "chunkdata" from pngrutil.c to the png_struct, so
+    it will be freed by png_read_destroy() in case of a read error (Kurt
+    Christensen).
+
+Version 1.4.0beta22 [July 21, 2008]
+  Change "purpose" and "buffer" to png_ptr->chunkdata to avoid memory leaking.
+
+Version 1.4.0beta23 [July 22, 2008]
+  Change "chunkdata = NULL" to "png_ptr->chunkdata = NULL" several places in
+    png_decompress_chunk().
+
+Version 1.4.0beta24 [July 25, 2008]
+  Change all remaining "chunkdata" to "png_ptr->chunkdata" in
+    png_decompress_chunk(), and remove "chunkdata" from parameter list.
+  Put a call to png_check_chunk_name() in png_read_chunk_header().
+  Revised png_check_chunk_name() to reject a name with a lowercase 3rd byte.
+  Removed two calls to png_check_chunk_name() occuring later in the process.
+  Define PNG_NO_ERROR_NUMBERS by default in pngconf.h
+
+Version 1.4.0beta25 [July 30, 2008]
+  Added a call to png_check_chunk_name() in pngpread.c
+  Reverted png_check_chunk_name() to accept a name with a lowercase 3rd byte.
+  Added png_push_have_buffer() function to pngpread.c
+  Eliminated PNG_BIG_ENDIAN_SUPPORTED and associated png_get_* macros.
+  Made inline expansion of png_get_*() optional with PNG_USE_READ_MACROS.
+  Eliminated all PNG_USELESS_TESTS and PNG_CORRECT_PALETTE_SUPPORTED code.
+  Synced contrib directory and configure files with libpng-1.2.30beta06.
+  Eliminated no-longer-used pngdefs.h (but it's still built in the makefiles)
+  Relocated a misplaced "#endif /* PNG_NO_WRITE_FILTER */" in pngwutil.c
+
+Version 1.4.0beta26 [August 4, 2008]
+  Removed png_push_have_buffer() function in pngpread.c.  It increased the
+    compiled library size slightly.
+  Changed "-Wall" to "-W -Wall" in the CFLAGS in all makefiles (Cosmin Truta)
+  Declared png_ptr "volatile" in pngread.c and pngwrite.c to avoid warnings.
+  Updated contrib/visupng/cexcept.h to version 2.0.1
+  Added PNG_LITERAL_CHARACTER macros for #, [, and ].
+
+Version 1.4.0beta27 [August 5, 2008]
+  Revised usage of PNG_LITERAL_SHARP in pngerror.c.
+  Moved newline character from individual png_debug messages into the
+    png_debug macros.
+  Allow user to #define their own png_debug, png_debug1, and png_debug2.
+
+Version 1.4.0beta28 [August 5, 2008]
+  Revised usage of PNG_LITERAL_SHARP in pngerror.c.
+  Added PNG_STRING_NEWLINE macro
+
+Version 1.4.0beta29 [August 9, 2008]
+  Revised usage of PNG_STRING_NEWLINE to work on non-ISO compilers.
+  Added PNG_STRING_COPYRIGHT macro.
+  Added non-ISO versions of png_debug macros.
+
+Version 1.4.0beta30 [August 14, 2008]
+  Added premultiplied alpha feature (Volker Wiendl).
+
+Version 1.4.0beta31 [August 18, 2008]
+  Moved png_set_premultiply_alpha from pngtrans.c to pngrtran.c
+  Removed extra crc check at the end of png_handle_cHRM().  Bug introduced
+    in libpng-1.4.0beta20.
+
+Version 1.4.0beta32 [August 19, 2008]
+  Added PNG_WRITE_FLUSH_SUPPORTED block around new png_flush() call.
+  Revised PNG_NO_STDIO version of png_write_flush()
+
+Version 1.4.0beta33 [August 20, 2008]
+  Added png_get|set_chunk_cache_max() to limit the total number of sPLT,
+    text, and unknown chunks that can be stored.
+
+Version 1.4.0beta34 [September 6, 2008]
+  Shortened tIME_string to 29 bytes in pngtest.c
+  Fixed off-by-one error introduced in png_push_read_zTXt() function in
+    libpng-1.2.30beta04/pngpread.c (Harald van Dijk)
+
+Version 1.4.0beta35 [October 6, 2008]
+  Changed "trans_values" to "trans_color".
+  Changed so-number from 0 to 14.  Some OS do not like 0.
+  Revised makefile.darwin to fix shared library numbering.
+  Change png_set_gray_1_2_4_to_8() to png_set_expand_gray_1_2_4_to_8()
+    in example.c (debian bug report)
+
+Version 1.4.0beta36 [October 25, 2008]
+  Sync with tEXt vulnerability fix in libpng-1.2.33rc02.
+
+Version 1.4.0beta37 [November 13, 2008]
+  Added png_check_cHRM in png.c and moved checking from pngget.c, pngrutil.c,
+    and pngwrite.c
+
+Version 1.4.0beta38 [November 22, 2008]
+  Added check for zero-area RGB cHRM triangle in png_check_cHRM() and
+    png_check_cHRM_fixed().
+
+Version 1.4.0beta39 [November 23, 2008]
+  Revised png_warning() to write its message on standard output by default
+    when warning_fn is NULL.
+
+Version 1.4.0beta40 [November 24, 2008]
+  Eliminated png_check_cHRM().  Instead, always use png_check_cHRM_fixed().
+  In png_check_cHRM_fixed(), ensure white_y is > 0, and removed redundant
+    check for all-zero coordinates that is detected by the triangle check.
+
+Version 1.4.0beta41 [November 26, 2008]
+  Fixed string vs pointer-to-string error in png_check_keyword().
+  Rearranged test expressions in png_check_cHRM_fixed() to avoid internal
+    overflows.
+  Added PNG_NO_CHECK_cHRM conditional.
+
+Version 1.4.0beta42, 43 [December 1, 2008]
+  Merge png_debug with version 1.2.34beta04.
+
+Version 1.4.0beta44 [December 6, 2008]
+  Removed redundant check for key==NULL before calling png_check_keyword()
+    to ensure that new_key gets initialized and removed extra warning
+    (Merge with version 1.2.34beta05 -- Arvan Pritchard).
+
+Version 1.4.0beta45 [December 9, 2008]
+  In png_write_png(), respect the placement of the filler bytes in an earlier
+    call to png_set_filler() (Jim Barry).
+
+Version 1.4.0beta46 [December 10, 2008]
+  Undid previous change and added PNG_TRANSFORM_STRIP_FILLER_BEFORE and
+    PNG_TRANSFORM_STRIP_FILLER_AFTER conditionals and deprecated
+    PNG_TRANSFORM_STRIP_FILLER (Jim Barry).
+
+Version 1.4.0beta47 [December 15, 2008]
+  Support for dithering was disabled by default, because it has never
+    been well tested and doesn't work very well.  The code has not
+    been removed, however, and can be enabled by building libpng with
+    PNG_READ_DITHER_SUPPORTED defined.
+
+Version 1.4.0beta48 [February 14, 2009]
+  Added new exported function png_calloc().
+  Combined several instances of png_malloc(); png_memset() into png_calloc().
+  Removed prototype for png_freeptr() that was added in libpng-1.4.0beta24
+    but was never defined.
+
+Version 1.4.0beta49 [February 28, 2009]
+  Added png_fileno() macro to pngconf.h, used in pngwio.c
+  Corrected order of #ifdef's in png_debug definition in png.h
+  Fixed bug introduced in libpng-1.4.0beta48 with the memset arguments
+    for pcal_params.
+  Fixed order of #ifdef directives in the png_debug defines in png.h
+    (bug introduced in libpng-1.2.34/1.4.0beta29).
+  Revised comments in png_set_read_fn() and png_set_write_fn().
+
+Version 1.4.0beta50 [March 18, 2009]
+  Use png_calloc() instead of png_malloc() to allocate big_row_buf when
+    reading an interlaced file, to avoid a possible UMR.
+  Undid revision of PNG_NO_STDIO version of png_write_flush().  Users
+    having trouble with fflush() can build with PNG_NO_WRITE_FLUSH defined
+    or supply their own flush_fn() replacement.
+  Revised libpng*.txt and png.h documentation about use of png_write_flush()
+    and png_set_write_fn().
+  Removed fflush() from pngtest.c.
+  Added "#define PNG_NO_WRITE_FLUSH" to contrib/pngminim/encoder/pngusr.h
+
+Version 1.4.0beta51 [March 21, 2009]
+  Removed new png_fileno() macro from pngconf.h .
+
+Version 1.4.0beta52 [March 27, 2009]
+  Relocated png_do_chop() ahead of building gamma tables in pngrtran.c
+    This avoids building 16-bit gamma tables unnecessarily.
+  Removed fflush() from pngtest.c.
+  Added "#define PNG_NO_WRITE_FLUSH" to contrib/pngminim/encoder/pngusr.h
+  Added a section on differences between 1.0.x and 1.2.x to libpng.3/libpng.txt
+
+Version 1.4.0beta53 [April 1, 2009]
+  Removed some remaining MMX macros from pngpriv.h
+  Fixed potential memory leak of "new_name" in png_write_iCCP() (Ralph Giles)
+
+Version 1.4.0beta54 [April 13, 2009]
+  Added "ifndef PNG_SKIP_SETJMP_CHECK" block in pngconf.h to allow
+    application code writers to bypass the check for multiple inclusion
+    of setjmp.h when they know that it is safe to ignore the situation.
+  Eliminated internal use of setjmp() in pngread.c and pngwrite.c
+  Reordered ancillary chunks in pngtest.png to be the same as what
+    pngtest now produces, and made some cosmetic changes to pngtest output.
+  Eliminated deprecated png_read_init_3() and png_write_init_3() functions.
+
+Version 1.4.0beta55 [April 15, 2009]
+  Simplified error handling in pngread.c and pngwrite.c by putting
+    the new png_read_cleanup() and png_write_cleanup() functions inline.
+
+Version 1.4.0beta56 [April 25, 2009]
+  Renamed "user_chunk_data" to "my_user_chunk_data" in pngtest.c to suppress
+    "shadowed declaration" warning from gcc-4.3.3.
+  Renamed "gamma" to "png_gamma" in pngset.c to avoid "shadowed declaration"
+    warning about a global "gamma" variable in math.h on some platforms.
+
+Version 1.4.0beta57 [May 2, 2009]
+  Removed prototype for png_freeptr() that was added in libpng-1.4.0beta24
+    but was never defined (again).
+  Rebuilt configure scripts with autoconf-2.63 instead of 2.62
+  Removed pngprefs.h and MMX from makefiles
+
+Version 1.4.0beta58 [May 14, 2009]
+  Changed pngw32.def to pngwin.def in makefile.mingw (typo was introduced
+    in beta57).
+  Clarified usage of sig_bit versus sig_bit_p in example.c (Vincent Torri)
+
+Version 1.4.0beta59 [May 15, 2009]
+  Reformated sources in libpng style (3-space intentation, comment format)
+  Fixed typo in libpng docs (PNG_FILTER_AVE should be PNG_FILTER_AVG)
+  Added sections about the git repository and our coding style to the
+    documentation
+  Relocated misplaced #endif in pngwrite.c, sCAL chunk handler.
+
+Version 1.4.0beta60 [May 19, 2009]
+  Conditionally compile png_read_finish_row() which is not used by
+    progressive readers.
+  Added contrib/pngminim/preader to demonstrate building minimal progressive
+    decoder, based on contrib/gregbook with embedded libpng and zlib.
+
+Version 1.4.0beta61 [May 20, 2009]
+  In contrib/pngminim/*, renamed "makefile.std" to "makefile", since there
+    is only one makefile in those directories, and revised the README files
+    accordingly.
+  More reformatting of comments, mostly to capitalize sentences.
+
+Version 1.4.0beta62 [June 2, 2009]
+  Added "#define PNG_NO_WRITE_SWAP" to contrib/pngminim/encoder/pngusr.h
+    and "define PNG_NO_READ_SWAP" to decoder/pngusr.h and preader/pngusr.h
+  Reformatted several remaining "else statement" into two lines.
+  Added a section to the libpng documentation about using png_get_io_ptr()
+    in configure scripts to detect the presence of libpng.
+
+Version 1.4.0beta63 [June 15, 2009]
+  Revised libpng*.txt and libpng.3 to mention calling png_set_IHDR()
+    multiple times and to specify the sample order in the tRNS chunk,
+    because the ISO PNG specification has a typo in the tRNS table.
+  Changed several PNG_UNKNOWN_CHUNK_SUPPORTED to
+    PNG_HANDLE_AS_UNKNOWN_SUPPORTED, to make the png_set_keep mechanism
+    available for ignoring known chunks even when not saving unknown chunks.
+  Adopted preference for consistent use of "#ifdef" and "#ifndef" versus
+    "#if defined()" and "if !defined()" where possible.
+
+Version 1.4.0beta64 [June 24, 2009]
+  Eliminated PNG_LEGACY_SUPPORTED code.
+  Moved the various unknown chunk macro definitions outside of the
+     PNG_READ|WRITE_ANCILLARY_CHUNK_SUPPORTED blocks.
+
+Version 1.4.0beta65 [June 26, 2009]
+  Added a reference to the libpng license in each file.
+
+Version 1.4.0beta66 [June 27, 2009]
+  Refer to the libpng license instead of the libpng license in each file.
+
+Version 1.4.0beta67 [July 6, 2009]
+  Relocated INVERT_ALPHA within png_read_png() and png_write_png().
+  Added high-level API transform PNG_TRANSFORM_GRAY_TO_RGB.
+  Added an "xcode" project to the projects directory (Alam Arias).
+
+Version 1.4.0beta68 [July 19, 2009]
+  Avoid some tests in filter selection in pngwutil.c
+
+Version 1.4.0beta69 [July 25, 2009]
+  Simplified the new filter-selection test.  This runs faster in the
+    common "PNG_ALL_FILTERS" and PNG_FILTER_NONE cases.
+  Removed extraneous declaration from the new call to png_read_gray_to_rgb()
+    (bug introduced in libpng-1.4.0beta67).
+  Fixed up xcode project (Alam Arias)
+  Added a prototype for png_64bit_product() in png.c
+
+Version 1.4.0beta70 [July 27, 2009]
+  Avoid a possible NULL dereference in debug build, in png_set_text_2().
+    (bug introduced in libpng-0.95, discovered by Evan Rouault)
+
+Version 1.4.0beta71 [July 29, 2009]
+  Rebuilt configure scripts with autoconf-2.64.
+
+Version 1.4.0beta72 [August 1, 2009]
+  Replaced *.tar.lzma with *.tar.xz in distribution.  Get the xz codec
+    from <http://tukaani.org/xz>.
+
+Version 1.4.0beta73 [August 1, 2009]
+  Reject attempt to write iCCP chunk with negative embedded profile length
+    (JD Chen)
+
+Version 1.4.0beta74 [August 8, 2009]
+  Changed png_ptr and info_ptr member "trans" to "trans_alpha".
+
+Version 1.4.0beta75 [August 21, 2009]
+  Removed an extra png_debug() recently added to png_write_find_filter().
+  Fixed incorrect #ifdef in pngset.c regarding unknown chunk support.
+
+Version 1.4.0beta76 [August 22, 2009]
+  Moved an incorrectly located test in png_read_row() in pngread.c
+
+Version 1.4.0beta77 [August 27, 2009]
+  Removed lpXYZ.tar.bz2 (with CRLF), KNOWNBUG, libpng-x.y.z-KNOWNBUG.txt,
+    and the "noconfig" files from the distribution.
+  Moved CMakeLists.txt from scripts into the main libpng directory.
+  Various bugfixes and improvements to CMakeLists.txt (Philip Lowman)
+
+Version 1.4.0beta78 [August 31, 2009]
+  Converted all PNG_NO_* tests to PNG_*_SUPPORTED everywhere except pngconf.h
+  Eliminated PNG_NO_FREE_ME and PNG_FREE_ME_SUPPORTED macros.
+  Use png_malloc plus a loop instead of png_calloc() to initialize
+    row_pointers in png_read_png().
+
+Version 1.4.0beta79 [September 1, 2009]
+  Eliminated PNG_GLOBAL_ARRAYS and PNG_LOCAL_ARRAYS; always use local arrays.
+  Eliminated PNG_CALLOC_SUPPORTED macro and always provide png_calloc().
+
+Version 1.4.0beta80 [September 17, 2009]
+  Removed scripts/libpng.icc
+  Changed typecast of filler from png_byte to png_uint_16 in png_set_filler().
+    (Dennis Gustafsson)
+  Fixed typo introduced in beta78 in pngtest.c ("#if def " should be "#ifdef ")
+
+Version 1.4.0beta81 [September 23, 2009]
+  Eliminated unused PNG_FLAG_FREE_* defines from pngpriv.h
+  Expanded TAB characters in pngrtran.c
+  Removed PNG_CONST from all "PNG_CONST PNG_CHNK" declarations to avoid
+    compiler complaints about doubly declaring things "const".
+  Changed all "#if [!]defined(X)" to "if[n]def X" where possible.
+  Eliminated unused png_ptr->row_buf_size
+
+Version 1.4.0beta82 [September 25, 2009]
+  Moved redundant IHDR checking into new png_check_IHDR() in png.c
+    and report all errors found in the IHDR data.
+  Eliminated useless call to png_check_cHRM() from pngset.c
+
+Version 1.4.0beta83 [September 25, 2009]
+  Revised png_check_IHDR() to eliminate bogus complaint about filter_type.
+
+Version 1.4.0beta84 [September 30, 2009]
+  Fixed some inconsistent indentation in pngconf.h
+  Revised png_check_IHDR() to add a test for width variable less than 32-bit.
+
+Version 1.4.0beta85 [October 1, 2009]
+  Revised png_check_IHDR() again, to check info_ptr members instead of
+    the contents of the returned parameters.
+
+Version 1.4.0beta86 [October 9, 2009]
+  Updated the "xcode" project (Alam Arias).
+  Eliminated a shadowed declaration of "pp" in png_handle_sPLT().
+
+Version 1.4.0rc01 [October 19, 2009]
+  Trivial cosmetic changes.
+
+Version 1.4.0beta87 [October 30, 2009]
+  Moved version 1.4.0 back into beta.
+
+Version 1.4.0beta88 [October 30, 2009]
+  Revised libpng*.txt section about differences between 1.2.x and 1.4.0
+    because most of the new features have now been ported back to 1.2.41
+
+Version 1.4.0beta89 [November 1, 2009]
+  More bugfixes and improvements to CMakeLists.txt (Philip Lowman)
+  Removed a harmless extra png_set_invert_alpha() from pngwrite.c
+  Apply png_user_chunk_cache_max within png_decompress_chunk().
+  Merged libpng-1.2.41.txt with libpng-1.4.0.txt where appropriate.
+
+Version 1.4.0beta90 [November 2, 2009]
+  Removed all remaining WIN32_WCE #ifdefs except those involving the
+    time.h "tm" structure
+
+Version 1.4.0beta91 [November 3, 2009]
+  Updated scripts/pngw32.def and projects/wince/png32ce.def
+  Copied projects/wince/png32ce.def to the scripts directory.
+  Added scripts/makefile.wce
+  Patched ltmain.sh for wince support.
+  Added PNG_CONVERT_tIME_SUPPORTED macro.
+
+Version 1.4.0beta92 [November 4, 2009]
+  Make inclusion of time.h in pngconf.h depend on PNG_CONVERT_tIME_SUPPORTED
+  Make #define PNG_CONVERT_tIME_SUPPORTED depend on PNG_WRITE_tIME_SUPPORTED
+  Revised libpng*.txt to describe differences from 1.2.40 to 1.4.0 (instead
+    of differences from 1.2.41 to 1.4.0)
+
+Version 1.4.0beta93 [November 7, 2009]
+  Added PNG_DEPSTRUCT, PNG_DEPRECATED, PNG_USE_RESULT, PNG_NORETURN, and
+    PNG_ALLOCATED macros to detect deprecated direct access to the
+    png_struct or info_struct members and other deprecated usage in
+    applications (John Bowler).
+  Updated scripts/makefile* to add "-DPNG_CONFIGURE_LIBPNG" to CFLAGS,
+    to prevent warnings about direct access to png structs by libpng
+    functions while building libpng.  They need to be tested, especially
+    those using compilers other than gcc.
+  Updated projects/visualc6 and visualc71 with "/d PNG_CONFIGURE_LIBPNG".
+    They should work but still need to be updated to remove
+    references to pnggccrd.c or pngvcrd.c and ASM building.
+  Added README.txt to the beos, cbuilder5, netware, and xcode projects warning
+    that they need to be updated, to remove references to pnggccrd.c and
+    pngvcrd.c and to depend on pngpriv.h
+  Removed three direct references to read_info_ptr members in pngtest.c
+    that were detected by the new PNG_DEPSTRUCT macro.
+  Moved the png_debug macro definitions and the png_read_destroy(),
+    png_write_destroy() and png_far_to_near() prototypes from png.h
+    to pngpriv.h (John Bowler)
+  Moved the synopsis lines for png_read_destroy(), png_write_destroy()
+    png_debug(), png_debug1(), and png_debug2() from libpng.3 to libpngpf.3.
+
+Version 1.4.0beta94 [November 9, 2009]
+  Removed the obsolete, unused pnggccrd.c and pngvcrd.c files.
+  Updated CMakeLists.txt to add "-DPNG_CONFIGURE_LIBPNG" to the definitions.
+  Removed dependency of pngtest.o on pngpriv.h in the makefiles.
+  Only #define PNG_DEPSTRUCT, etc. in pngconf.h if not already defined.
+
+Version 1.4.0beta95 [November 10, 2009]
+  Changed png_check_sig() to !png_sig_cmp() in contrib programs.
+  Added -DPNG_CONFIGURE_LIBPNG to contrib/pngminm/*/makefile
+  Changed png_check_sig() to !png_sig_cmp() in contrib programs.
+  Corrected the png_get_IHDR() call in contrib/gregbook/readpng2.c
+  Changed pngminim/*/gather.sh to stop trying to remove pnggccrd.c and pngvcrd.c
+  Added dependency on pngpriv.h in contrib/pngminim/*/makefile
+
+Version 1.4.0beta96 [November 12, 2009]
+  Renamed scripts/makefile.wce to scripts/makefile.cegcc
+  Revised Makefile.am to use libpng.sys while building libpng.so
+    so that only PNG_EXPORT functions are exported.
+  Removed the deprecated png_check_sig() function/macro.
+  Removed recently removed function names from scripts/*.def
+  Revised pngtest.png to put chunks in the same order written by pngtest
+    (evidently the same change made in libpng-1.0beta54 was lost).
+  Added PNG_PRIVATE macro definition in pngconf.h for possible future use.
+
+Version 1.4.0beta97 [November 13, 2009]
+  Restored pngtest.png to the libpng-1.4.0beta7 version.
+  Removed projects/beos and netware.txt; no one seems to be supporting them.
+  Revised Makefile.in
+
+Version 1.4.0beta98 [November 13, 2009]
+  Added the "xcode" project to zip distributions,
+  Fixed a typo in scripts/pngwin.def introduced in beta97.
+
+Version 1.4.0beta99 [November 14, 2009]
+  Moved libpng-config.in and libpng.pc-configure.in out of the scripts
+    directory, to libpng-config.in and libpng-pc.in, respectively, and
+    modified Makefile.am and configure.ac accordingly.  Now "configure"
+    needs nothing from the "scripts" directory.
+  Avoid redefining PNG_CONST in pngconf.h
+
+Version 1.4.0beta100 [November 14, 2009]
+  Removed ASM builds from projects/visualc6 and projects/visualc71
+  Removed scripts/makefile.nommx and makefile.vcawin32
+  Revised CMakeLists.txt to account for new location of libpng-config.in
+    and libpng-pc.in
+  Updated INSTALL to reflect removal and relocation of files.
+
+Version 1.4.0beta101 [November 14, 2009]
+  Restored the binary files (*.jpg, *.png, some project files) that were
+    accidentally deleted from the zip and 7z distributions when the xcode
+    project was added.
+
+Version 1.4.0beta102 [November 18, 2009]
+  Added libpng-config.in and libpng-pc.in to the zip and 7z distributions.
+  Fixed a typo in projects/visualc6/pngtest.dsp, introduced in beta100.
+  Moved descriptions of makefiles and other scripts out of INSTALL into
+    scripts/README.txt
+  Updated the copyright year in scripts/pngwin.rc from 2006 to 2009.
+
+Version 1.4.0beta103 [November 21, 2009]
+  Removed obsolete comments about ASM from projects/visualc71/README_zlib.txt
+  Align row_buf on 16-byte boundary in memory.
+  Restored the PNG_WRITE_FLUSH_AFTER_IEND_SUPPORTED guard around the call
+    to png_flush() after png_write_IEND().  See 1.4.0beta32, 1.4.0beta50
+    changes above and 1.2.30, 1.2.30rc01 and rc03 in 1.2.41 CHANGES.  Someone
+    needs this feature.
+  Make the 'png_jmpbuf' macro expand to a call that records the correct
+    longjmp function as well as returning a pointer to the setjmp
+    jmp_buf buffer, and marked direct access to jmpbuf 'deprecated'.
+    (John Bowler)
+
+Version 1.4.0beta104 [November 22, 2009]
+  Removed png_longjmp_ptr from scripts/*.def and libpng.3
+  Rebuilt configure scripts with autoconf-2.65
+
+Version 1.4.0beta105 [November 25, 2009]
+  Use fast integer PNG_DIVIDE_BY_255() or PNG_DIVIDE_BY_65535()
+    to accomplish alpha premultiplication when
+    PNG_READ_COMPOSITE_NODIV_SUPPORTED is defined.
+  Changed "/255" to "/255.0" in background calculations to make it clear
+    that the 255 is used as a double.
+
+Version 1.4.0beta106 [November 27, 2009]
+  Removed premultiplied alpha feature.
+
+Version 1.4.0beta107 [December 4, 2009]
+  Updated README
+  Added "#define PNG_NO_PEDANTIC_WARNINGS" in the libpng source files.
+  Removed "-DPNG_CONFIGURE_LIBPNG" from the makefiles and projects.
+  Revised scripts/makefile.netbsd, makefile.openbsd, and makefile.sco
+    to put png.h and pngconf.h in $prefix/include, like the other scripts,
+    instead of in $prefix/include/libpng.  Also revised makefile.sco
+    to put them in $prefix/include/libpng15 instead of in
+    $prefix/include/libpng/libpng15.
+
+Version 1.4.0beta108 [December 11, 2009]
+  Removed leftover "-DPNG_CONFIGURE_LIBPNG" from contrib/pngminim/*/makefile
+  Relocated png_do_chop() to its original position in pngrtran.c; the
+    change in version 1.2.41beta08 caused transparency to be handled wrong
+    in some 16-bit datastreams (Yusaku Sugai).
+
+Version 1.4.0beta109 [December 13, 2009]
+  Added "bit_depth" parameter to the private png_build_gamma_table() function.
+  Pass bit_depth=8 to png_build_gamma_table() when bit_depth is 16 but the
+    PNG_16_TO_8 transform has been set, to avoid unnecessary build of 16-bit
+    tables.
+
+Version 1.4.0rc02 [December 20, 2009]
+  Declared png_cleanup_needed "volatile" in pngread.c and pngwrite.c
+
+Version 1.4.0rc03 [December 22, 2009]
+  Renamed libpng-pc.in back to libpng.pc.in and revised CMakeLists.txt
+    (revising the change in 1.4.0beta99)
+
+Version 1.4.0rc04 [December 25, 2009]
+  Swapped PNG_UNKNOWN_CHUNKS_SUPPORTED and PNG_HANDLE_AS_UNKNOWN_SUPPORTED
+    in pngset.c to be consistent with other changes in version 1.2.38.
+
+Version 1.4.0rc05 [December 25, 2009]
+  Changed "libpng-pc.in" to "libpng.pc.in" in configure.ac, configure, and
+    Makefile.in to be consistent with changes in libpng-1.4.0rc03
+
+Version 1.4.0rc06 [December 29, 2009]
+  Reverted the gamma_table changes from libpng-1.4.0beta109.
+  Fixed some indentation errors.
+
+Version 1.4.0rc07 [January 1, 2010]
+  Revised libpng*.txt and libpng.3 about 1.2.x->1.4.x differences.
+  Use png_calloc() instead of png_malloc(); png_memset() in pngrutil.c
+  Update copyright year to 2010.
+
+Version 1.4.0rc08 [January 2, 2010]
+  Avoid deprecated references to png_ptr-io_ptr and png_ptr->error_ptr
+    in pngtest.c
+
+Version 1.4.0 [January 3, 2010]
+  No changes.
+
+Version 1.4.1beta01 [January 8, 2010]
+  Updated CMakeLists.txt for consistent indentation and to avoid an
+    unclosed if-statement warning (Philip Lowman).
+  Revised Makefile.am and Makefile.in to remove references to Y2KINFO,
+    KNOWNBUG, and libpng.la (Robert Schwebel).
+  Revised the makefiles to install the same files and symbolic
+    links as configure, except for libpng.la and libpng14.la.
+  Make png_set|get_compression_buffer_size() available even when
+    PNG_WRITE_SUPPORTED is not enabled.
+  Revised Makefile.am and Makefile.in to simplify their maintenance.
+  Revised scripts/makefile.linux to install a link to libpng14.so.14.1
+
+Version 1.4.1beta02 [January 9, 2010]
+  Revised the rest of the makefiles to install a link to libpng14.so.14.1
+
+Version 1.4.1beta03 [January 10, 2010]
+  Removed png_set_premultiply_alpha() from scripts/*.def
+
+Version 1.4.1rc01 [January 16, 2010]
+  No changes.
+
+Version 1.4.1beta04 [January 23, 2010]
+  Revised png_decompress_chunk() to improve speed and memory usage when
+    decoding large chunks.
+  Added png_set|get_chunk_malloc_max() functions.
+
+Version 1.4.1beta05 [January 26, 2010]
+  Relocated "int k" declaration in pngtest.c to minimize its scope.
+
+Version 1.4.1beta06 [January 28, 2010]
+  Revised png_decompress_chunk() to use a two-pass method suggested by
+    John Bowler.
+
+Version 1.4.1beta07 [February 6, 2010]
+  Folded some long lines in the source files.
+  Added defineable PNG_USER_CHUNK_CACHE_MAX, PNG_USER_CHUNK_MALLOC_MAX,
+    and a PNG_USER_LIMITS_SUPPORTED flag.
+  Eliminated use of png_ptr->irowbytes and reused the slot in png_ptr as
+    png_ptr->png_user_chunk_malloc_max.
+  Revised png_push_save_buffer() to do fewer but larger png_malloc() calls.
+
+Version 1.4.1beta08 [February 6, 2010]
+  Minor cleanup and updating of dates and copyright year.
+
+Version 1.5.0beta01 [February 7, 2010]
+  Moved declaration of png_struct into private pngstruct.h and png_info
+    into pnginfo.h
+
+Version 1.4.1beta09 and 1.5.0beta02 [February 7, 2010]
+  Reverted to original png_push_save_buffer() code.
+
+Version 1.4.1beta10 and 1.5.0beta03 [February 8, 2010]
+  Return allocated "old_buffer" in png_push_save_buffer() before
+    calling png_error(), to avoid a potential memory leak.
+  Updated configure script to use SO number 15.
+
+Version 1.5.0beta04 [February 9, 2010]
+  Removed malformed "incomplete struct declaration" of png_info from png.h
+
+Version 1.5.0beta05 [February 12, 2010]
+  Removed PNG_DEPSTRUCT markup in pngstruct.h and pnginfo.h, and undid the
+    linewrapping that it entailed.
+  Revised comments in pngstruct.h and pnginfo.h and added pointers to
+    the libpng license.
+  Changed PNG_INTERNAL to PNG_EXPOSE_INTERNAL_STRUCTURES
+  Removed the cbuilder5 project, which has not been updated to 1.4.0.
+
+Version 1.4.1beta12 and 1.5.0beta06 [February 14, 2010]
+  Fixed type declaration of png_get_chunk_malloc_max() in pngget.c (Daisuke
+    Nishikawa)
+
+Version 1.5.0beta07 [omitted]
+
+Version 1.5.0beta08 [February 19, 2010]
+  Changed #ifdef PNG_NO_STDIO_SUPPORTED to #ifdef PNG_NO_CONSOLE_IO_SUPPORTED
+    wherever png_snprintf() is used to construct error and warning messages.
+  Noted in scripts/makefile.mingw that it expects to be run under MSYS.
+  Removed obsolete unused MMX-querying support from contrib/gregbook
+  Added exported png_longjmp() function.
+  Removed the AIX redefinition of jmpbuf in png.h
+  Added -D_ALLSOURCE in configure.ac, makefile.aix, and CMakeLists.txt
+    when building on AIX.
+
+Version 1.5.0beta09 [February 19, 2010]
+  Removed -D_ALLSOURCE from configure.ac, makefile.aix, and CMakeLists.txt.
+  Changed the name of png_ptr->jmpbuf to png_ptr->png_jmpbuf in pngstruct.h
+
+Version 1.5.0beta10 [February 25, 2010]
+  Removed unused gzio.c from contrib/pngminim gather and makefile scripts
+  Removed replacement error handlers from contrib/gregbook.  Because of
+    the new png_longjmp() function they are no longer needed.
+
+Version 1.5.0beta11 [March 6, 2010]
+  Removed checking for already-included setjmp.h from pngconf.h
+  Fixed inconsistent indentations and made numerous cosmetic changes.
+  Revised the "SEE ALSO" style of libpng.3, libpngpf.3, and png.5
+
+Version 1.5.0beta12 [March 9, 2010]
+  Moved "#include png.h" inside pngpriv.h and removed "#include png.h" from
+    the source files, along with "#define PNG_EXPOSE_INTERNAL_STRUCTURES"
+    and "#define PNG_NO_PEDANTIC_WARNINGS" (John Bowler).
+  Created new pngdebug.h and moved debug definitions there.
+
+Version 1.5.0beta13 [March 10, 2010]
+  Protect pngstruct.h, pnginfo.h, and pngdebug.h from being included twice.
+  Revise the "#ifdef" blocks in png_inflate() so it will compile when neither
+    PNG_USER_CHUNK_MALLOC_MAX nor PNG_SET_CHUNK_MALLOC_LIMIT_SUPPORTED
+    is defined.
+  Removed unused png_measure_compressed_chunk() from pngpriv.h and libpngpf.3
+  Moved the 'config.h' support from pngconf.h to pngpriv.h
+  Removed PNGAPI from the png_longjmp_ptr typedef.
+  Eliminated dependence of pngtest.c on the private pngdebug.h file.
+  Make all png_debug macros into *unterminated* statements or
+    expressions (i.e. a trailing ';' must always be added) and correct
+    the format statements in various png_debug messages.
+
+Version 1.5.0beta14 [March 14, 2010]
+  Removed direct access to png_ptr->io_ptr from the Windows code in pngtest.c
+  Revised Makefile.am to account for recent additions and replacements.
+  Corrected CE and OS/2 DEF files (scripts/png*def) for symbols removed and
+    added ordinal numbers to the Windows DEF file and corrected the duplicated
+    ordinal numbers on CE symbols that are commented out.
+  Added back in export symbols that can be present in the Windows build but
+    are disabled by default.
+  PNG_EXPORT changed to include an 'ordinal' field for DEF file generation.
+    PNG_CALLBACK added to make callback definitions uniform.  PNGAPI split
+    into PNGCAPI (base C form), PNGAPI (exports) and PNGCBAPI (callbacks),
+    and appropriate changes made to all files.  Cygwin builds re-hinged to
+    allow procedure call standard changes and to remove the need for the DEF
+    file (fixes build on Cygwin).
+  Enabled 'attribute' warnings that are relevant to library APIs and callbacks.
+  Changed rules for generation of the various symbol files and added a new
+    rule for a DEF file (which is also added to the distribution).
+  Updated the symbol file generation to stop it adding spurious spaces
+    to EOL (coming from preprocessor macro expansion).  Added a facility
+    to join tokens in the output and rewrite *.dfn to use this.
+  Eliminated scripts/*.def in favor of libpng.def; updated projects/visualc71
+    and removed scripts/makefile.cygwin.
+  Made PNG_BUILD_DLL safe: it can be set whenever a DLL is being built.
+  Removed the include of sys/types.h - apparently unnecessary now on the
+    platforms on which it happened (all but Mac OS and RISC OS).
+  Moved the Mac OS test into pngpriv.h (the only place it is used.)
+
+Version 1.5.0beta15 [March 17, 2010]
+  Added symbols.chk target to Makefile.am to validate the symbols in png.h
+    against the new DEF file scripts/symbols.def.
+  Changed the default DEF file back to pngwin.def.
+  Removed makefile.mingw.
+  Eliminated PNG_NO_EXTERN and PNG_ALL_EXTERN
+
+Version 1.5.0beta16 [April 1, 2010]
+  Make png_text_struct independent of PNG_iTXt_SUPPORTED, so that
+    fields are initialized in all configurations.  The READ/WRITE
+    macros (PNG_(READ|WRITE)_iTXt_SUPPORTED) still function as
+    before to disable code to actually read or write iTXt chunks
+    and iTXt_SUPPORTED can be used to detect presence of either
+    read or write support (but it is probably better to check for
+    the one actually required - read or write.)
+  Combined multiple png_warning() calls for a single error.
+  Restored the macro definition of png_check_sig().
+
+Version 1.5.0beta17 [April 17, 2010]
+  Added some "(long)" typecasts to printf calls in png_handle_cHRM().
+  Documented the fact that png_set_dither() was disabled since libpng-1.4.0.
+  Reenabled png_set_dither() but renamed it to png_set_quantize() to reflect
+    more accurately what it actually does.  At the same time, renamed
+    the PNG_DITHER_[RED,GREEN_BLUE]_BITS macros to
+    PNG_QUANTIZE_[RED,GREEN,BLUE]_BITS.
+  Added some "(long)" typecasts to printf calls in png_handle_cHRM().
+  Freeze build-time only configuration in the build.
+    In all prior versions of libpng most configuration options
+    controlled by compiler #defines had to be repeated by the
+    application code that used libpng.  This patch changes this
+    so that compilation options that can only be changed at build
+    time are frozen in the build.  Options that are compiler
+    dependent (and those that are system dependent) are evaluated
+    each time - pngconf.h holds these.  Options that can be changed
+    per-file in the application are in png.h.  Frozen options are
+    in the new installed header file pnglibconf.h (John Bowler)
+  Removed the xcode project because it has not been updated to work
+    with libpng-1.5.0.
+  Removed the ability to include optional pngusr.h
+
+Version 1.5.0beta18 [April 17, 2010]
+  Restored the ability to include optional pngusr.h
+  Moved replacements for png_error() and png_warning() from the
+    contrib/pngminim project to pngerror.c, for use when warnings or
+    errors are disabled via PNG_NO_WARN or PNG_NO_ERROR_TEXT, to avoid
+    storing unneeded error/warning text.
+  Updated contrib/pngminim project to work with the new pnglibconf.h
+  Added some PNG_NO_* defines to contrib/pngminim/*/pngusr.h to save space.
+
+Version 1.5.0beta19 [April 24, 2010]
+  Added PNG_{READ,WRITE}_INT_FUNCTIONS_SUPPORTED.  This allows the functions
+    to read and write ints to be disabled independently of PNG_USE_READ_MACROS,
+    which allows libpng to be built with the functions even though the default
+    is to use the macros - this allows applications to choose at app build
+    time whether or not to use macros (previously impossible because the
+    functions weren't in the default build.)
+  Changed Windows calling convention back to __cdecl for API functions.
+    For Windows/x86 platforms only:
+      __stdcall is no longer needed for Visual Basic, so libpng-1.5.0 uses
+      __cdecl throughout (both API functions and callbacks) on Windows/x86
+      platforms.
+  Replaced visualc6 and visualc71 projects with new vstudio project
+  Relaxed the overly-restrictive permissions of some files.
+
+Version 1.5.0beta20 [April 24, 2010]
+  Relaxed more overly-restrictive permissions of some files.
+
+Version 1.5.0beta21 [April 27, 2010]
+  Removed some unwanted binary bytes and changed CRLF to NEWLINE in the new
+    vstudio project files, and some trivial editing of some files in the
+    scripts directory.
+  Set PNG_NO_READ_BGR, PNG_NO_IO_STATE, and PNG_NO_TIME_RFC1123 in
+    contrib/pngminim/decoder/pngusr.h to make a smaller decoder application.
+
+Version 1.5.0beta22 [April 28, 2010]
+  Fixed dependencies of GET_INT_32 - it does not require READ_INT_FUNCTIONS
+    because it has a macro equivalent.
+  Improved the options.awk script; added an "everything off" option.
+  Revised contrib/pngminim to use the "everything off" option in pngusr.dfa.
+
+Version 1.5.0beta23 [April 29, 2010]
+  Corrected PNG_REMOVED macro to take five arguments.
+    The macro was documented with two arguments (name,ordinal), however
+    the symbol checking .dfn files assumed five arguments.  The five
+    argument form seems more useful so it is changed to that.
+  Corrected PNG_UNKNOWN_CHUNKS_SUPPORTED to PNG_HANDLE_AS_UNKNOWN_SUPPORTED
+    in gregbook/readpng2.c
+  Corrected protection of png_get_user_transform_ptr. The API declaration in
+    png.h is removed if both READ and WRITE USER_TRANSFORM are turned off
+    but was left defined in pngtrans.c
+  Added logunsupported=1 to cause pnglibconf.h to document disabled options.
+    This makes the installed pnglibconf.h more readable but causes no
+    other change.  The intention is that users of libpng will find it
+    easier to understand if an API they need is missing.
+  Include png_reset_zstream() in png.c only when PNG_READ_SUPPORTED is defined.
+  Removed dummy_inflate.c from contrib/pngminim/encoder
+  Removed contrib/pngminim/*/gather.sh; gathering is now done in the makefile.
+
+Version 1.5.0beta24 [May 7, 2010]
+  Use bitwise "&" instead of arithmetic mod in pngrutil.c calculation of the
+    offset of the png_ptr->rowbuf pointer into png_ptr->big_row_buf.
+  Added more blank lines for readability.
+
+Version 1.5.0beta25 [June 18, 2010]
+  In pngpread.c: png_push_have_row() add check for new_row > height
+  Removed the now-redundant check for out-of-bounds new_row from example.c
+
+Version 1.5.0beta26 [June 18, 2010]
+  In pngpread.c: png_push_process_row() add check for too many rows.
+
+Version 1.5.0beta27 [June 18, 2010]
+  Removed the check added in beta25 as it is now redundant.
+
+Version 1.5.0beta28 [June 20, 2010]
+  Rewrote png_process_IDAT_data to consistently treat extra data as warnings
+    and handle end conditions more cleanly.
+  Removed the new (beta26) check in png_push_process_row().
+
+Version 1.5.0beta29 [June 21, 2010]
+  Revised scripts/options.awk to work on Sunos (but still doesn't work)
+  Added comment to options.awk and contrib/pngminim/*/makefile to try nawk.
+
+Version 1.5.0beta30 [June 22, 2010]
+  Stop memory leak when reading a malformed sCAL chunk.
+
+Version 1.5.0beta31 [June 26, 2010]
+  Revised pngpread.c patch of beta28 to avoid an endless loop.
+  Removed some trailing blanks.
+
+Version 1.5.0beta32 [June 26, 2010]
+  Removed leftover scripts/options.patch and scripts/options.rej
+
+Version 1.5.0beta33 [July 6, 3010]
+  Made FIXED and FLOATING options consistent in the APIs they enable and
+    disable.  Corrected scripts/options.awk to handle both command line
+    options and options specified in the .dfa files.
+  Changed char *msg to PNG_CONST char *msg in pngrutil.c
+  Make png_set_sRGB_gAMA_and_cHRM set values using either the fixed or
+    floating point APIs, but not both.
+  Reversed patch to remove error handler when the jmp_buf is stored in the
+    main program structure, not the png_struct.
+    The error handler is needed because the default handler in libpng will
+    always use the jmp_buf in the library control structure; this is never
+    set.  The gregbook code is a useful example because, even though it
+    uses setjmp/longjmp, it shows how error handling can be implemented
+    using control mechanisms not directly supported by libpng.  The
+    technique will work correctly with mechanisms such as Microsoft
+    Structure Exceptions or C++ exceptions (compiler willing - note that gcc
+    does not by default support interworking of C and C++ error handling.)
+  Reverted changes to call png_longjmp in contrib/gregbook where it is not
+    appropriate.  If mainprog->jmpbuf is used by setjmp, then png_longjmp
+    cannot be used.
+  Changed "extern PNG_EXPORT" to "PNG_EXPORT" in png.h (Jan Nijtmans)
+  Changed "extern" to "PNG_EXTERN" in pngpriv.h (except for the 'extern "C" {')
+
+Version 1.5.0beta34 [July 12, 2010]
+  Put #ifndef PNG_EXTERN, #endif around the define PNG_EXTERN in pngpriv.h
+
+Version 1.5.0beta35 [July 24, 2010]
+  Removed some newly-added TAB characters.
+  Added -DNO_PNG_SNPRINTF to CFLAGS in scripts/makefile.dj2
+  Moved the definition of png_snprintf() outside of the enclosing
+    #ifdef blocks in pngconf.h
+
+Version 1.5.0beta36 [July 29, 2010]
+  Patches by John Bowler:
+  Fixed point APIs are now supported throughout (no missing APIs).
+  Internal fixed point arithmetic support exists for all internal floating
+    point operations.
+  sCAL validates the floating point strings it is passed.
+  Safe, albeit rudimentary, Watcom support is provided by PNG_API_RULE==2
+  Two new APIs exist to get the number of passes without turning on the
+    PNG_INTERLACE transform and to get the number of rows in the current
+    pass.
+  A new test program, pngvalid.c, validates the gamma code.
+  Errors in the 16-bit gamma correction (overflows) have been corrected.
+  cHRM chunk testing is done consistently (previously the floating point
+    API bypassed it, because the test really didn't work on FP, now the test
+    is performed on the actual values to be stored in the PNG file so it
+    works in the FP case too.)
+  Most floating point APIs now simply call the fixed point APIs after
+    converting the values to the fixed point form used in the PNG file.
+  The standard headers no longer include zlib.h, which is currently only
+    required for pngstruct.h and can therefore be internal.
+  Revised png_get_int_32 to undo the PNG two's complement representation of
+    negative numbers.
+
+Version 1.5.0beta37 [July 30, 2010]
+  Added a typecast in png_get_int_32() in png.h and pngrutil.h to avoid
+    a compiler warning.
+  Replaced oFFs 0,0 with oFFs -10,20 in pngtest.png
+
+Version 1.5.0beta38 [July 31, 2010]
+  Implemented remaining "_fixed" functions.
+  Corrected a number of recently introduced warnings mostly resulting from
+    safe but uncast assignments to shorter integers.  Also added a zlib
+    VStudio release library project because the latest zlib Official Windows
+    build does not include such a thing.
+  Revised png_get_int_16() to be similar to png_get_int_32().
+  Restored projects/visualc71.
+
+Version 1.5.0beta39 [August 2, 2010]
+  VisualC/GCC warning fixes, VisualC build fixes
+  The changes include support for function attributes in VC in addition to
+    those already present in GCC - necessary because without these some
+    warnings are unavoidable.  Fixes include signed/unsigned fixes in
+    pngvalid and checks with gcc -Wall -Wextra -Wunused.
+  VC requires function attributes on function definitions as well as
+    declarations, PNG_FUNCTION has been added to enable this and the
+    relevant function definitions changed.
+
+Version 1.5.0beta40 [August 6, 2010]
+  Correct use of _WINDOWS_ in pngconf.h
+  Removed png_mem_ #defines; they are no longer used.
+  Added the sRGB chunk to pngtest.png
+
+Version 1.5.0beta41 [August 11, 2010]
+  Added the cHRM chunk to pngtest.png
+  Don't try to use version-script with cygwin/mingw.
+  Revised contrib/gregbook to work under cygwin/mingw.
+
+Version 1.5.0beta42 [August 18, 2010]
+  Add .dll.a to the list of extensions to be symlinked by Makefile.am (Yaakov)
+  Made all API functions that have const arguments and constant string
+    literal pointers declare them (John Bowler).
+
+Version 1.5.0beta43 [August 20, 2010]
+  Removed spurious tabs, shorten long lines (no source change)
+    Also added scripts/chkfmt to validate the format of all the files that can
+    reasonably be validated (it is suggested to run "make distclean" before
+    checking, because some machine generated files have long lines.)
+  Reformatted the CHANGES file to be more consistent throughout.
+  Made changes to address various issues identified by GCC, mostly
+    signed/unsigned and shortening problems on assignment but also a few
+    difficult to optimize (for GCC) loops.
+  Fixed non-GCC fixed point builds.  In png.c a declaration was misplaced
+    in an earlier update.  Fixed to declare the auto variables at the head.
+  Use cexcept.h in pngvalid.c.
+
+Version 1.5.0beta44 [August 24, 2010]
+  Updated CMakeLists.txt to use CMAKE_INSTALL_LIBDIR variable; useful for
+    installing libpng in /usr/lib64 (Funda Wang).
+  Revised CMakeLists.txt to put the man pages in share/man/man* not man/man*
+  Revised CMakeLists.txt to make symlinks instead of copies when installing.
+  Changed PNG_LIB_NAME from pngNN to libpngNN in CMakeLists.txt (Philip Lowman)
+  Implemented memory checks within pngvalid
+  Reformatted/rearranged pngvalid.c to assist use of progressive reader.
+  Check interlaced images in pngvalid
+  Clarified pngusr.h comments in pnglibconf.dfa
+  Simplified the pngvalid error-handling code now that cexcept.h is in place.
+  Implemented progressive reader in pngvalid.c for standard tests
+  Implemented progressive read in pngvalid.c gamma tests
+  Turn on progressive reader in pngvalid.c by default and tidy code.
+
+Version 1.5.0beta45 [August 26, 2010]
+  Added an explicit make step to projects/vstudio for pnglibconf.h
+    Also corrected zlib.vcxproj into which Visual Studio had introduced
+    what it calls an "authoring error".  The change to make pnglibconf.h
+    simply copies the file; in the future it may actually generate the
+    file from scripts/pnglibconf.dfa as the other build systems do.
+  Changed pngvalid to work when floating point APIs are disabled
+  Renamed the prebuilt scripts/pnglibconf.h to scripts/pnglibconf.h.prebuilt
+  Supply default values for PNG_USER_PRIVATEBUILD and PNG_USER_DLLFNAME_POSTFIX
+    in pngpriv.h in case the user neglected to define them in their pngusr.h
+
+Version 1.5.0beta46 [August 28, 2010]
+  Added new private header files to libpng_sources in CMakeLists.txt
+  Added PNG_READ_16BIT, PNG_WRITE_16BIT, and PNG_16BIT options.
+  Added reference to scripts/pnglibconf.h.prebuilt in the visualc71 project.
+
+Version 1.5.0beta47 [September 11, 2010]
+  Fixed a number of problems with 64-bit compilation reported by Visual
+    Studio 2010 (John Bowler).
+
+Version 1.5.0beta48 [October 4, 2010]
+  Updated CMakeLists.txt (Philip Lowman).
+  Revised autogen.sh to recognize and use $AUTOCONF, $AUTOMAKE, $AUTOHEADER,
+    $AUTOPOINT, $ACLOCAL and $LIBTOOLIZE
+  Fixed problem with symbols creation in Makefile.am which was assuming that
+    all versions of ccp write to standard output by default (Martin Banky). The
+    bug was introduced in libpng-1.2.9beta5.
+  Removed unused mkinstalldirs.
+
+Version 1.5.0beta49 [October 8, 2010]
+  Undid Makefile.am revision of 1.5.0beta48.
+
+Version 1.5.0beta50 [October 14, 2010]
+  Revised Makefile.in to account for mkinstalldirs being removed.
+  Added some "(unsigned long)" typecasts in printf statements in pngvalid.c.
+  Suppressed a compiler warning in png_handle_sPLT().
+  Check for out-of-range text compression mode in png_set_text().
+
+Version 1.5.0beta51 [October 15, 2010]
+  Changed embedded dates to "(PENDING RELEASE) in beta releases (and future
+    rc releases) to minimize the difference between releases.
+
+Version 1.5.0beta52 [October 16, 2010]
+  Restored some of the embedded dates (in png.h, png.c, documentation, etc.)
+
+Version 1.5.0beta53 [October 18, 2010]
+  Updated INSTALL to mention using "make maintainer-clean" and to remove
+    obsolete statement about a custom ltmain.sh
+  Disabled "color-tests" by default in Makefile.am so it will work with
+    automake versions earlier than 1.11.1
+  Use document name "libpng-manual.txt" instead of "libpng-<version>.txt"
+    to simplify version differences.
+  Removed obsolete remarks about setjmp handling from INSTALL.
+  Revised and renamed the typedef in png.h and png.c that was designed
+    to catch library and header mismatch.
+
+Version 1.5.0beta54 [November 10, 2010]
+  Require 48 bytes, not 64 bytes, for big_row_buf in overflow checks.
+  Used a consistent structure for the pngget.c functions.
+
+Version 1.5.0beta55 [November 21, 2010]
+  Revised png_get_uint_32, png_get_int_32, png_get_uint_16 (Cosmin)
+  Moved reading of file signature into png_read_sig (Cosmin)
+  Fixed atomicity of chunk header serialization (Cosmin)
+  Added test for io_state in pngtest.c (Cosmin)
+  Added "#!/bin/sh" at the top of contrib/pngminim/*/gather.sh scripts.
+  Changes to remove gcc warnings (John Bowler)
+    Certain optional gcc warning flags resulted in warnings in libpng code.
+    With these changes only -Wconversion and -Wcast-qual cannot be turned on.
+    Changes are trivial rearrangements of code.  -Wconversion is not possible
+    for pngrutil.c (because of the widespread use of += et al on variables
+    smaller than (int) or (unsigned int)) and -Wcast-qual is not possible
+    with pngwio.c and pngwutil.c because the 'write' callback and zlib
+    compression both fail to declare their input buffers with 'const'.
+
+Version 1.5.0beta56 [December 7, 2010]
+  Added the private PNG_UNUSED() macro definition in pngpriv.h.
+  Added some commentary about PNG_EXPORT in png.h and pngconf.h
+  Revised PNG_EXPORT() macro and added PNG_EXPORTA() macro, with the
+    objective of simplifying and improving the cosmetic appearance of png.h.
+  Fixed some incorrect "=" macro names in pnglibconf.dfa
+  Included documentation of changes in 1.5.0 from 1.4.x in libpng-manual.txt
+
+Version 1.5.0beta57 [December 9, 2010]
+  Documented the pngvalid gamma error summary with additional comments and
+    print statements.
+  Improved missing symbol handling in checksym.awk; symbols missing in both
+    the old and new files can now be optionally ignored, treated as errors
+    or warnings.
+  Removed references to pngvcrd.c and pnggccrd.c from the vstudio project.
+  Updated "libpng14" to "libpng15" in the visualc71 project.
+  Enabled the strip16 tests in pngvalid.`
+  Don't display test results (except PASS/FAIL) when running "make test".
+    Instead put them in pngtest-log.txt
+  Added "--with-zprefix=<string>" to configure.ac
+  Updated the prebuilt configuration files to autoconf version 2.68
+
+Version 1.5.0beta58 [December 19, 2010]
+  Fixed interlace image handling and add test cases (John Bowler)
+  Fixed the clean rule in Makefile.am to remove pngtest-log.txt
+  Made minor changes to work around warnings in gcc 3.4
+
+Version 1.5.0rc01 [December 27, 2010]
+  No changes.
+
+Version 1.5.0rc02 [December 27, 2010]
+  Eliminated references to the scripts/*.def files in project/visualc71.
+
+Version 1.5.0rc03 [December 28, 2010]
+  Eliminated scripts/*.def and revised Makefile.am accordingly
+
+Version 1.5.0rc04 [December 29, 2010]
+  Fixed bug in background transformation handling in pngrtran.c (it was
+    looking for the flag in png_ptr->transformations instead of in
+    png_ptr->flags) (David Raymond).
+
+Version 1.5.0rc05 [December 31, 2010]
+  Fixed typo in a comment in CMakeLists.txt (libpng14 => libpng15) (Cosmin)
+
+Version 1.5.0rc06 [January 4, 2011]
+  Changed the new configure option "zprefix=string" to "zlib-prefix=string"
+
+Version 1.5.0rc07 [January 4, 2011]
+  Updated copyright year.
+
+Version 1.5.0 [January 6, 2011]
+  No changes.
+
+version 1.5.1beta01 [January 8, 2011]
+  Added description of png_set_crc_action() to the manual.
+  Added a note in the manual that the type of the iCCP profile was changed
+    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, 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).
+  Updated CMakeLists.txt (Clifford Yapp)
+
+Version 1.5.1beta03 [January 14, 2011]
+  Fixed typecasting of some png_debug() statements (Cosmin)
+
+Version 1.5.1beta04 [January 16, 2011]
+  Updated documentation of png_set|get_tRNS() (Thomas Klausner).
+  Mentioned in the documentation that applications must #include "zlib.h"
+    if they need access to anything in zlib.h, and that a number of
+    macros such as png_memset() are no longer accessible by applications.
+  Corrected pngvalid gamma test "sample" function to access all of the color
+    samples of each pixel, instead of sampling the red channel three times.
+  Prefixed variable names index, div, exp, gamma with "png_" to avoid "shadow"
+    warnings, and (mistakenly) changed png_exp() to exp().
+
+Version 1.5.1beta05 [January 16, 2011]
+  Changed variable names png_index, png_div, png_exp, and png_gamma to
+    char_index, divisor, exp_b10, and gamma_val, respectively, and
+    changed exp() back to png_exp().
+
+Version 1.5.1beta06 [January 20, 2011]
+  Prevent png_push_crc_skip() from hanging while reading an unknown chunk
+    or an over-large compressed zTXt chunk with the progressive reader.
+  Eliminated more GCC "shadow" warnings.
+  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
+    (CVE-2011-0408, CERT VU#643140).  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.
+
+Version 1.5.1rc01 [January 29, 2011]
+  No changes.
+
+Version 1.5.1rc02 [January 31, 2011]
+  Added a request in the manual that applications do not use "png_" or
+    "PNG_" to begin any of their own symbols.
+  Changed PNG_UNUSED to "(void)param;" and updated the commentary in pngpriv.h
+
+Version 1.5.1 [February 3, 2011]
+  No changes.
+
+Version 1.5.2beta01 [February 13, 2011]
+  More -Wshadow fixes for older gcc compilers.  Older gcc versions apparently
+    check formal parameters names in function declarations (as well as
+    definitions) to see if they match a name in the global namespace.
+  Revised PNG_EXPORTA macro to not use an empty parameter, to accommodate the
+    old VisualC++ preprocessor.
+  Turned on interlace handling in png_read_png().
+  Fixed gcc pendantic warnings.
+  Handle longjmp in Cygwin.
+  Fixed png_get_current_row_number() in the interlaced case.
+  Cleaned up ALPHA flags and transformations.
+  Implemented expansion to 16 bits.
+
+Version 1.5.2beta02 [February 19, 2011]
+  Fixed mistake in the descriptions of user read_transform and write_transform
+    function prototypes in the manual.  The row_info struct is png_row_infop.
+  Reverted png_get_current_row_number() to previous (1.5.2beta01) behavior.
+  Corrected png_get_current_row_number documentation
+  Fixed the read/write row callback documentation.
+    This documents the current behavior, where the callback is called after
+    every row with information pertaining to the next row.
+
+Version 1.5.2beta03 [March 3, 2011]
+  Fixed scripts/makefile.vcwin32
+  Updated contrib/pngsuite/README to add the word "modify".
+  Define PNG_ALLOCATED to blank when _MSC_VER<1300.
+
+Version 1.5.2rc01 [March 19, 2011]
+  Define remaining attributes to blank when MSC_VER<1300.
+  ifdef out mask arrays in pngread.c when interlacing is not supported.
+
+Version 1.5.2rc02 [March 22, 2011]
+  Added a hint to try CPP=/bin/cpp if "cpp -E" fails in scripts/pnglibconf.mak
+    and in contrib/pngminim/*/makefile, eg., on SunOS 5.10, and removed "strip"
+    from the makefiles.
+  Fixed a bug (present since libpng-1.0.7) that makes png_handle_sPLT() fail
+    to compile when PNG_NO_POINTER_INDEXING is defined (Chubanov Kirill)
+
+Version 1.5.2rc03 [March 24, 2011]
+  Don't include standard header files in png.h while building the symbol table,
+    to avoid cpp failure on SunOS (introduced PNG_BUILDING_SYMBOL_TABLE macro).
+
+Version 1.5.2 [March 31, 2011]
+  No changes.
+
+Version 1.5.3beta01 [April 1, 2011]
+  Re-initialize the zlib compressor before compressing non-IDAT chunks.
+  Added API functions to set parameters for zlib compression of non-IDAT
+    chunks.
+
+Version 1.5.3beta02 [April 3, 2011]
+  Updated scripts/symbols.def with new API functions.
+  Only compile the new zlib re-initializing code when text or iCCP is
+    supported, using PNG_WRITE_COMPRESSED_TEXT_SUPPORTED macro.
+  Improved the optimization of the zlib CMF byte (see libpng-1.2.6beta03).
+  Optimize the zlib CMF byte in non-IDAT compressed chunks
+
+Version 1.5.3beta03 [April 16, 2011]
+  Fixed gcc -ansi -pedantic compile. A strict ANSI system does not have
+    snprintf, and the "__STRICT_ANSI__" detects that condition more reliably
+    than __STDC__ (John Bowler).
+  Removed the PNG_PTR_NORETURN attribute because it too dangerous. It tells
+    the compiler that a user supplied callback (the error handler) does not
+    return, yet there is no guarantee in practice that the application code
+    will correctly implement the error handler because the compiler only
+    issues a warning if there is a mistake (John Bowler).
+  Removed the no-longer-used PNG_DEPSTRUCT macro.
+  Updated the zlib version to 1.2.5 in the VStudio project.
+  Fixed 64-bit builds where png_uint_32 is smaller than png_size_t in
+    pngwutil.c (John Bowler).
+  Fixed bug with stripping the filler or alpha channel when writing, that
+    was introduced in libpng-1.5.2beta01 (bug report by Andrew Church).
+
+Version 1.5.3beta04 [April 27, 2011]
+  Updated pngtest.png with the new zlib CMF optimization.
+  Cleaned up conditional compilation code and of background/gamma handling
+    Internal changes only except a new option to avoid compiling the
+    png_build_grayscale_palette API (which is not used at all internally.)
+    The main change is to move the transform tests (READ_TRANSFORMS,
+    WRITE_TRANSFORMS) up one level to the caller of the APIs.  This avoids
+    calls to spurious functions if all transforms are disabled and slightly
+    simplifies those functions.  Pngvalid modified to handle this.
+    A minor change is to stop the strip_16 and expand_16 interfaces from
+    disabling each other; this allows the future alpha premultiplication
+    code to use 16-bit intermediate values while still producing 8-bit output.
+    png_do_background and png_do_gamma have been simplified to take a single
+    pointer to the png_struct rather than pointers to every item required
+    from the png_struct. This makes no practical difference to the internal
+    code.
+  A serious bug in the pngvalid internal routine 'standard_display_init' has
+    been fixed - this failed to initialize the red channel and accidentally
+    initialized the alpha channel twice.
+  Changed png_struct jmp_buf member name from png_jmpbuf to tmp_jmpbuf to
+    avoid a possible clash with the png_jmpbuf macro on some platforms.
+
+Version 1.5.3beta05 [May 6, 2011]
+  Added the "_POSIX_SOURCE" feature test macro to ensure libpng sees the
+    correct API. _POSIX_SOURCE is defined in pngpriv.h, pngtest.c and
+    pngvalid.c to ensure that POSIX conformant systems disable non-POSIX APIs.
+  Removed png_snprintf and added formatted warning messages.  This change adds
+    internal APIs to allow png_warning messages to have parameters without
+    requiring the host OS to implement snprintf.  As a side effect the
+    dependency of the tIME-supporting RFC1132 code on stdio is removed and
+    PNG_NO_WARNINGS does actually work now.
+  Pass "" instead of '\0' to png_default_error() in png_err().  This mistake
+    was introduced in libpng-1.2.20beta01.
+  Added PNG_WRITE_OPTIMIZE_CMF_SUPPORTED macro to make the zlib "CMF" byte
+    optimization configureable.
+  IDAT compression failed if preceded by a compressed text chunk (bug
+    introduced in libpng-1.5.3beta01-02).  This was because the attempt to
+    reset the zlib stream in png_write_IDAT happened after the first IDAT
+    chunk had been deflated - much too late.  In this change internal
+    functions were added to claim/release the z_stream and, hopefully, make
+    the code more robust.  Also deflateEnd checking is added - previously
+    libpng would ignore an error at the end of the stream.
+
+Version 1.5.3beta06 [May 8, 2011]
+  Removed the -D_ALL_SOURCE from definitions for AIX in CMakeLists.txt
+  Implemented premultiplied alpha support: png_set_alpha_mode API
+
+Version 1.5.3beta07 [May 11, 2011]
+  Added expand_16 support to the high level interface.
+  Added named value and 'flag' gamma support to png_set_gamma.  Made a minor
+    change from the previous (unreleased) ABI/API to hide the exact value used
+    for Macs - it's not a good idea to embed this in the ABI!
+  Moved macro definitions for PNG_HAVE_IHDR, PNG_HAVE_PLTE, and PNG_AFTER_IDAT
+    from pngpriv.h to png.h because they must be visible to applications
+    that call png_set_unknown_chunks().
+  Check for up->location !PNG_AFTER_IDAT when writing unknown chunks
+    before IDAT.
+
+Version 1.5.3beta08 [May 16, 2011]
+  Improved "pngvalid --speed" to exclude more of pngvalid from the time.
+  Documented png_set_alpha_mode(), other changes in libpng.3/libpng-manual.txt
+  The cHRM chunk now sets the defaults for png_set_rgb_to_gray() (when negative
+    parameters are supplied by the caller), while in the absence of cHRM
+    sRGB/Rec 709 values are still used.
+  The bKGD chunk no longer overwrites the background value set by
+    png_set_background(), allowing the latter to be used before the file
+    header is read. It never performed any useful function to override
+    the default anyway.
+  Added memory overwrite and palette image checks to pngvalid.c
+    Previously palette image code was poorly checked. Since the transformation
+    code has a special palette path in most cases this was a severe weakness.
+  Minor cleanup and some extra checking in pngrutil.c and pngrtran.c. When
+    expanding an indexed image, always expand to RGBA if transparency is
+    present.
+
+Version 1.5.3beta09 [May 17, 2011]
+  Reversed earlier 1.5.3 change of transformation order; move png_expand_16
+    back where it was.  The change doesn't work because it requires 16-bit
+    gamma tables when the code only generates 8-bit ones.  This fails
+    silently; the libpng code just doesn't do any gamma correction.  Moving
+    the tests back leaves the old, inaccurate, 8-bit gamma calculations, but
+    these are clearly better than none!
+
+Version 1.5.3beta10 [May 20, 2011]
+
+  png_set_background() and png_expand_16() did not work together correctly.
+    This problem is present in 1.5.2; if png_set_background is called with
+    need_expand false and the matching 16 bit color libpng erroneously just
+    treats it as an 8-bit color because of where png_do_expand_16 is in the
+    transform list.  This simple fix reduces the supplied colour to 8-bits,
+    so it gets smashed, but this is better than the current behavior.
+  Added tests for expand16, more fixes for palette image tests to pngvalid.
+    Corrects the code for palette image tests and disables attempts to
+    validate palette colors.
+
+Version 1.5.3rc01 [June 3, 2011]
+  No changes.
+
+Version 1.5.3rc02 [June 8, 2011]
+  Fixed uninitialized memory read in png_format_buffer() (Bug report by
+    Frank Busse, CVE-2011-2501, related to CVE-2004-0421).
+
+Version 1.5.3beta11 [June 11, 2011]
+  Fixed png_handle_sCAL which is broken in 1.5; added sCAL to pngtest.png
+  Revised documentation about png_set_user_limits() to say that it also affects
+    png writing.
+  Revised handling of png_set_user_limits() so that it can increase the
+    limit beyond the PNG_USER_WIDTH|HEIGHT_MAX; previously it could only
+    reduce it.
+  Make the 16-to-8 scaling accurate. Dividing by 256 with no rounding is
+    wrong (high by one) 25% of the time. Dividing by 257 with rounding is
+    wrong in 128 out of 65536 cases. Getting the right answer all the time
+    without division is easy.
+  Added "_SUPPORTED" to the PNG_WRITE_CUSTOMIZE_ZTXT_COMPRESSION macro.
+  Added projects/owatcom, an IDE project for OpenWatcom to replace
+    scripts/makefile.watcom.  This project works with OpenWatcom 1.9. The
+    IDE autogenerates appropriate makefiles (libpng.mk) for batch processing.
+    The project is configurable, unlike the Visual Studio project, so long
+    as the developer has an awk.
+  Changed png_set_gAMA to limit the gamma value range so that the inverse
+    of the stored value cannot overflow the fixed point representation,
+    and changed other things OpenWatcom warns about.
+  Revised pngvalid.c to test PNG_ALPHA_MODE_SUPPORTED correctly. This allows
+    pngvalid to build when ALPHA_MODE is not supported, which is required if
+    it is to build on libpng 1.4.
+  Removed string/memory macros that are no longer used and are not
+    necessarily fully supportable, particularly png_strncpy and png_snprintf.
+  Added log option to pngvalid.c and attempted to improve gamma messages.
+  
+Version 1.5.3 [omitted]
+  People found the presence of a beta release following an rc release
+    to be confusing; therefore we bump the version to libpng-1.5.4beta01
+    and there will be no libpng-1.5.3 release.
+
+Version 1.5.4beta01 [June 14, 2011]
+  Made it possible to undefine PNG_READ_16_TO_8_ACCURATE_SCALE_SUPPORTED
+    to get the same (inaccurate) output as libpng-1.5.2 and earlier.
+  Moved definitions of PNG_HAVE_IHDR, PNG_AFTER_IDAT, and PNG_HAVE_PLTE
+    outside of an unknown-chunk block in png.h because they are also
+    needed for other uses.
+
+Version 1.5.4beta02 [June 14, 2011]
+  Fixed and clarified LEGACY 16-to-8 scaling code.
+  Added png_set_chop_16() API, to match inaccurate results from previous
+    libpng versions.
+  Removed the ACCURATE and LEGACY options (they are no longer useable)
+  Use the old scaling method for background if png_set_chop_16() was
+    called.
+  Made png_set_chop_16() API removeable by disabling PNG_CHOP_16_TO_8_SUPPORTED
+
+Version 1.5.4beta03 [June 15, 2011]
+  Fixed a problem in png_do_expand_palette() exposed by optimization in
+    1.5.3beta06
+  Also removed a spurious and confusing "trans" member ("trans") from png_info.
+  The palette expand optimization prevented expansion to an intermediate RGBA
+    form if tRNS was present but alpha was marked to be stripped; this exposed
+    a check for tRNS in png_do_expand_palette() which is inconsistent with the
+    code elsewhere in libpng.
+  Correction to the expand_16 code; removed extra instance of
+    png_set_scale_16_to_8 from pngpriv.h
+
+Version 1.5.4beta04 [June 16, 2011]
+  Added a missing "#ifdef PNG_READ_BACKGROUND_SUPPORTED/#endif" in pngrtran.c
+  Added PNG_TRANSFORM_CHOP_16 to the high-level read transforms.
+  Made PNG_READ_16_TO_8_ACCURATE_SCALE configurable again.  If this is
+    not enabled, png_set_strip_16() and png_do_scale_16_to_8() aren't built.
+  Revised contrib/visupng, gregbook, and pngminim to demonstrate chop_16_to_8
+
+Version 1.5.4beta05 [June 16, 2011]
+  Renamed png_set_strip_16() to png_set_scale_16() and renamed
+    png_set_chop_16() to png_set_strip(16) in an attempt to minimize the
+    behavior changes between libpng14 and libpng15.
+
+Version 1.5.4beta06 [June 18, 2011]
+  Fixed new bug that was causing both strip_16 and scale_16 to be applied.
+
+Version 1.5.4beta07 [June 19, 2011]
+  Fixed pngvalid, simplified macros, added checking for 0 in sCAL.
+    The ACCURATE scale macro is no longer defined in 1.5 - call the
+    png_scale_16_to_8 API.  Made sure that PNG_READ_16_TO_8 is still defined
+    if the png_strip_16_to_8 API is present.  png_check_fp_number now
+    maintains some state so that positive, negative and zero values are
+    identified.  sCAL uses these to be strictly spec conformant.
+
+Version 1.5.4beta08 [June 23, 2011]
+  Fixed pngvalid if ACCURATE_SCALE is defined.
+  Updated scripts/pnglibconf.h.prebuilt.
+
+Version 1.5.4rc01 [June 30, 2011]
+  Define PNG_ALLOCATED to "restrict" only if MSC_VER >= 1400.
+
+Version 1.5.4 [July 7, 2011]
+
 Send comments/corrections/commendations to png-mng-implement at lists.sf.net
 (subscription required; visit
 https://lists.sourceforge.net/lists/listinfo/png-mng-implement
@@ -1760,3 +3540,5 @@
 or to glennrp at users.sourceforge.net
 
 Glenn R-P
+*/ }
+#endif
--- a/jdk/src/share/native/sun/awt/libpng/LICENSE	Wed Jul 05 17:51:25 2017 +0200
+++ b/jdk/src/share/native/sun/awt/libpng/LICENSE	Mon Sep 26 14:29:34 2011 -0700
@@ -8,8 +8,10 @@
 If you modify libpng you may insert additional notices immediately following
 this sentence.
 
-libpng versions 1.2.6, August 15, 2004, through 1.2.18, May 15, 2007, are
-Copyright (c) 2004, 2006-2007 Glenn Randers-Pehrson, and are
+This code is released under the libpng license.
+
+libpng versions 1.2.6, August 15, 2004, through 1.5.4, July 7, 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
 
@@ -106,4 +108,4 @@
 
 Glenn Randers-Pehrson
 glennrp at users.sourceforge.net
-May 15, 2007
+July 7, 2011
--- a/jdk/src/share/native/sun/awt/libpng/README	Wed Jul 05 17:51:25 2017 +0200
+++ b/jdk/src/share/native/sun/awt/libpng/README	Mon Sep 26 14:29:34 2011 -0700
@@ -1,11 +1,11 @@
-README for libpng version 1.2.18 - May 15, 2007 (shared library 12.0)
+README for libpng version 1.5.4 - July 7, 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.
 
-Libpng comes in several distribution formats.  Get libpng-*.tar.gz
-or libpng-*.tar.bz2 if you want UNIX-style line endings in the text
-files, or lpng*.zip if you want DOS-style line endings.
+Libpng comes in several distribution formats.  Get libpng-*.tar.gz,
+libpng-*.tar.xz or libpng-*.tar.bz2 if you want UNIX-style line endings
+in the text files, or lpng*.zip if you want DOS-style line endings.
 
 Version 0.89 was the first official release of libpng.  Don't let the
 fact that it's the first release fool you.  The libpng library has been in
@@ -54,11 +54,11 @@
 critical or an ancillary chunk.
 
 The changes made to the library, and bugs fixed are based on discussions
-on the PNG-implement mailing list
-and not on material submitted privately to Guy, Andreas, or Glenn.  They will
-forward any good suggestions to the list.
+on the PNG-implement mailing list and not on material submitted
+privately to Guy, Andreas, or Glenn.  They will forward any good
+suggestions to the list.
 
-For a detailed description on using libpng, read libpng.txt.  For
+For a detailed description on using libpng, read libpng-manual.txt.  For
 examples of libpng in a program, see example.c and pngtest.c.  For usage
 information and restrictions (what little they are) on libpng, see
 png.h.  For a description on using zlib (the compression library used by
@@ -101,31 +101,29 @@
 fix.  Please mention "libpng" somewhere in the subject line.  Thanks.
 
 This release was created and will be supported by myself (of course
-based in a large way on Guy's and Andreas' earlier work), and the PNG group.
+based in a large way on Guy's and Andreas' earlier work), and the PNG
+development group.
 
-Send comments/corrections/commendations to png-mng-implement at lists.sf.net
-(subscription required; visit 
+Send comments/corrections/commendations to png-mng-implement at
+lists.sourceforge.net (subscription required; visit 
 https://lists.sourceforge.net/lists/listinfo/png-mng-implement
 to subscribe) or to glennrp at users.sourceforge.net
 
 You can't reach Guy, the original libpng author, at the addresses
-given in previous versions of this document.  He and Andreas will read mail
-addressed to the png-implement list, however.
+given in previous versions of this document.  He and Andreas will
+read mail addressed to the png-implement list, however.
 
 Please do not send general questions about PNG.  Send them to
-the (png-list at ccrc.wustl.edu, subscription required, write to
-majordomo at ccrc.wustl.edu with "subscribe png-list" in your message).
-On the other hand,
-please do not send libpng questions to that address, send them to me
-or to the png-implement list.  I'll
-get them in the end anyway.  If you have a question about something
+png-mng-misc at lists.sf.net (subscription required; visit
+https://lists.sourceforge.net/lists/listinfo/png-mng-misc to
+subscribe).  If you have a question about something
 in the PNG specification that is related to using libpng, send it
 to me.  Send me any questions that start with "I was using libpng,
 and ...".  If in doubt, send questions to me.  I'll bounce them
 to others, if necessary.
 
 Please do not send suggestions on how to change PNG.  We have
-been discussing PNG for nine years now, and it is official and
+been discussing PNG for sixteen years now, and it is official and
 finished.  If you have suggestions for libpng, however, I'll
 gladly listen.  Even if your suggestion is not used immediately,
 it may be used later.
@@ -140,14 +138,17 @@
       TODO          =>  Things not implemented in the current library
       Y2KINFO       =>  Statement of Y2K compliance
       example.c     =>  Example code for using libpng functions
-      libpng.3      =>  manual page for libpng (includes libpng.txt)
-      libpng.txt    =>  Description of libpng and its functions
+      libpng.3      =>  manual page for libpng (includes libpng-manual.txt)
+      libpng-manual.txt  =>  Description of libpng and its functions
       libpngpf.3    =>  manual page for libpng's private functions
       png.5         =>  manual page for the PNG format
       png.c         =>  Basic interface functions common to library
-      png.h         =>  Library function and interface declarations
-      pngconf.h     =>  System specific library configuration
-      pngasmrd.h    =>  Header file for assembler-coded functions
+      png.h         =>  Library function and interface declarations (public)
+      pngpriv.h     =>  Library function and interface declarations (private)
+      pngconf.h     =>  System specific library configuration (public)
+      pngstruct.h   =>  png_struct declaration (private)
+      pnginfo.h     =>  png_info struct declaration (private)
+      pngdebug.h    =>  debugging macros (private)
       pngerror.c    =>  Error/warning message I/O functions
       pngget.c      =>  Functions for retrieving info from struct
       pngmem.c      =>  Memory handling functions
@@ -174,84 +175,22 @@
        pngminus     =>  Simple pnm2png and png2pnm programs
        pngsuite     =>  Test images
        visupng      =>  Contains a MSVC workspace for VisualPng
-      projects      =>  Contains project files and workspaces for building DLL
-       beos             =>  Contains a Beos workspace for building libpng
-       c5builder        =>  Contains a Borland workspace for building libpng
-                            and zlib
-       visualc6         =>  Contains a Microsoft Visual C++ (MSVC) workspace
-                            for building libpng and zlib
-       netware.txt      =>  Contains instructions for downloading a set of
-                            project files for building libpng and zlib on
-                            Netware.
-       wince.txt        =>  Contains instructions for downloading a Microsoft
-                            Visual C++ (Windows CD Toolkit) workspace for
-                            building libpng and zlib on WindowsCE
+      projects      =>  Contains project files and workspaces for
+                        building a DLL
+       cbuilder5        =>  Contains a Borland workspace for building
+                            libpng and zlib
+       visualc6         =>  Contains a Microsoft Visual C++ (MSVC)
+                            workspace for building libpng and zlib
+       visualc71        =>  Contains a Microsoft Visual C++ (MSVC)
+                            workspace for building libpng and zlib
+       xcode            =>  Contains an Apple xcode
+                            workspace for building libpng and zlib
       scripts       =>  Directory containing scripts for building libpng:
-       descrip.mms      =>  VMS makefile for MMS or MMK
-       makefile.std     =>  Generic UNIX makefile (cc, creates static libpng.a)
-       makefile.elf     =>  Linux/ELF makefile symbol versioning,
-                            gcc, creates libpng12.so.0.1.2.18)
-       makefile.linux   =>  Linux/ELF makefile
-                            (gcc, creates libpng12.so.0.1.2.18)
-       makefile.gcmmx   =>  Linux/ELF makefile
-                            (gcc, creates libpng12.so.0.1.2.18,
-                            uses assembler code tuned for Intel MMX platform)
-       makefile.gcc     =>  Generic makefile (gcc, creates static libpng.a)
-       makefile.knr     =>  Archaic UNIX Makefile that converts files with
-                            ansi2knr (Requires ansi2knr.c from
-                            ftp://ftp.cs.wisc.edu/ghost)
-       makefile.aix     =>  AIX makefile
-       makefile.cygwin  =>  Cygwin/gcc makefile
-       makefile.darwin  =>  Darwin makefile
-       makefile.dec     =>  DEC Alpha UNIX makefile
-       makefile.freebsd =>  FreeBSD makefile
-       makefile.hpgcc   =>  HPUX makefile using gcc
-       makefile.hpux    =>  HPUX (10.20 and 11.00) makefile
-       makefile.hp64    =>  HPUX (10.20 and 11.00) makefile, 64 bit
-       makefile.ibmc    =>  IBM C/C++ version 3.x for Win32 and OS/2 (static)
-       makefile.intel   =>  Intel C/C++ version 4.0 and later
-       libpng.icc       =>  Project file, IBM VisualAge/C++ 4.0 or later
-       makefile.netbsd  =>  NetBSD/cc makefile, PNGGCCRD, makes libpng.so.
-       makefile.ne12bsd  =>  NetBSD/cc makefile, PNGGCCRD, makes libpng12.so
-       makefile.openbsd =>  OpenBSD makefile
-       makefile.sgi     =>  Silicon Graphics IRIX (cc, creates static lib)
-       makefile.sggcc   =>  Silicon Graphics
-                            (gcc, creates libpng12.so.0.1.2.18)
-       makefile.sunos   =>  Sun makefile
-       makefile.solaris =>  Solaris 2.X makefile
-                            (gcc, creates libpng12.so.0.1.2.18)
-       makefile.so9     =>  Solaris 9 makefile
-                            (gcc, creates libpng12.so.0.1.2.18)
-       makefile.32sunu  =>  Sun Ultra 32-bit makefile
-       makefile.64sunu  =>  Sun Ultra 64-bit makefile
-       makefile.sco     =>  For SCO OSr5  ELF and Unixware 7 with Native cc
-       makefile.mips    =>  MIPS makefile
-       makefile.acorn   =>  Acorn makefile
-       makefile.amiga   =>  Amiga makefile
-       smakefile.ppc    =>  AMIGA smakefile for SAS C V6.58/7.00 PPC
-                            compiler (Requires SCOPTIONS, copied from
-                            scripts/SCOPTIONS.ppc)
-       makefile.atari   =>  Atari makefile
-       makefile.beos    =>  BEOS makefile for X86
-       makefile.bor     =>  Borland makefile (uses bcc)
-       makefile.bc32    =>  32-bit Borland C++ (all modules compiled in C mode)
-       makefile.tc3     =>  Turbo C 3.0 makefile
-       makefile.dj2     =>  DJGPP 2 makefile
-       makefile.msc     =>  Microsoft C makefile
-       makefile.vcawin32=>  makefile for Microsoft Visual C++ 5.0 and
-                            later (uses assembler code tuned for Intel MMX
-                            platform)
-       makefile.vcwin32 =>  makefile for Microsoft Visual C++ 4.0 and
-                            later (does not use assembler code)
-       makefile.os2     =>  OS/2 Makefile (gcc and emx, requires pngos2.def)
-       pngos2.def       =>  OS/2 module definition file used by makefile.os2
-       makefile.watcom  =>  Watcom 10a+ Makefile, 32-bit flat memory model
-       makevms.com      =>  VMS build script
-       SCOPTIONS.ppc    =>  Used with smakefile.ppc
+                            (see scripts/README.txt for the list of scripts)
 
 Good luck, and happy coding.
 
--Glenn Randers-Pehrson (current maintainer)
+-Glenn Randers-Pehrson (current maintainer, since 1998)
  Internet: glennrp at users.sourceforge.net
 
 -Andreas Eric Dilger (former maintainer, 1996-1997)
--- a/jdk/src/share/native/sun/awt/libpng/png.c	Wed Jul 05 17:51:25 2017 +0200
+++ b/jdk/src/share/native/sun/awt/libpng/png.c	Mon Sep 26 14:29:34 2011 -0700
@@ -29,91 +29,20 @@
  * However, the following notice accompanied the original version of this
  * file and, per its terms, should not be removed:
  *
- * Last changed in libpng 1.2.17 May 15, 2007
- * For conditions of distribution and use, see copyright notice in png.h
- * Copyright (c) 1998-2007 Glenn Randers-Pehrson
+ * Last changed in libpng 1.5.4 [July 7, 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.)
+ *
+ * This code is released under the libpng license.
+ * For conditions of distribution and use, see the disclaimer
+ * and license in png.h
  */
 
-#define PNG_INTERNAL
-#define PNG_NO_EXTERN
-#include "png.h"
+#include "pngpriv.h"
 
 /* Generate a compiler error if there is an old png.h in the search path. */
-typedef version_1_2_18 Your_png_h_is_not_version_1_2_18;
-
-/* Version information for C files.  This had better match the version
- * string defined in png.h.  */
-
-#ifdef PNG_USE_GLOBAL_ARRAYS
-/* png_libpng_ver was changed to a function in version 1.0.5c */
-const char png_libpng_ver[18] = PNG_LIBPNG_VER_STRING;
-
-#ifdef PNG_READ_SUPPORTED
-
-/* png_sig was changed to a function in version 1.0.5c */
-/* Place to hold the signature string for a PNG file. */
-const png_byte FARDATA png_sig[8] = {137, 80, 78, 71, 13, 10, 26, 10};
-#endif /* PNG_READ_SUPPORTED */
-
-/* Invoke global declarations for constant strings for known chunk types */
-PNG_IHDR;
-PNG_IDAT;
-PNG_IEND;
-PNG_PLTE;
-PNG_bKGD;
-PNG_cHRM;
-PNG_gAMA;
-PNG_hIST;
-PNG_iCCP;
-PNG_iTXt;
-PNG_oFFs;
-PNG_pCAL;
-PNG_sCAL;
-PNG_pHYs;
-PNG_sBIT;
-PNG_sPLT;
-PNG_sRGB;
-PNG_tEXt;
-PNG_tIME;
-PNG_tRNS;
-PNG_zTXt;
-
-#ifdef PNG_READ_SUPPORTED
-/* arrays to facilitate easy interlacing - use pass (0 - 6) as index */
-
-/* start of interlace block */
-const int FARDATA png_pass_start[] = {0, 4, 0, 2, 0, 1, 0};
-
-/* offset to next interlace block */
-const int FARDATA png_pass_inc[] = {8, 8, 4, 4, 2, 2, 1};
-
-/* start of interlace block in the y direction */
-const int FARDATA png_pass_ystart[] = {0, 0, 4, 0, 2, 0, 1};
-
-/* offset to next interlace block in the y direction */
-const int FARDATA png_pass_yinc[] = {8, 8, 8, 4, 4, 2, 2};
-
-/* width of interlace block (used in assembler routines only) */
-#ifdef PNG_HAVE_MMX_COMBINE_ROW
-const int FARDATA png_pass_width[] = {8, 4, 4, 2, 2, 1, 1};
-#endif
-
-/* Height of interlace block.  This is not currently used - if you need
- * it, uncomment it here and in png.h
-const int FARDATA png_pass_height[] = {8, 8, 4, 4, 2, 2, 1};
-*/
-
-/* Mask to determine which pixels are valid in a pass */
-const int FARDATA png_pass_mask[] = {0x80, 0x08, 0x88, 0x22, 0xaa, 0x55, 0xff};
-
-/* Mask to determine which pixels to overwrite while displaying */
-const int FARDATA png_pass_dsp_mask[]
-   = {0xff, 0x0f, 0xff, 0x33, 0xff, 0x55, 0xff};
-
-#endif /* PNG_READ_SUPPORTED */
-#endif /* PNG_USE_GLOBAL_ARRAYS */
+typedef png_libpng_version_1_5_4 Your_png_h_is_not_version_1_5_4;
 
 /* 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
@@ -125,10 +54,13 @@
 void PNGAPI
 png_set_sig_bytes(png_structp png_ptr, int num_bytes)
 {
-   if(png_ptr == NULL) return;
-   png_debug(1, "in png_set_sig_bytes\n");
+   png_debug(1, "in png_set_sig_bytes");
+
+   if (png_ptr == NULL)
+      return;
+
    if (num_bytes > 8)
-      png_error(png_ptr, "Too many bytes for PNG signature.");
+      png_error(png_ptr, "Too many bytes for PNG signature");
 
    png_ptr->sig_bytes = (png_byte)(num_bytes < 0 ? 0 : num_bytes);
 }
@@ -142,11 +74,13 @@
  * PNG signature (this is the same behaviour as strcmp, memcmp, etc).
  */
 int PNGAPI
-png_sig_cmp(png_bytep sig, png_size_t start, png_size_t num_to_check)
+png_sig_cmp(png_const_bytep sig, png_size_t start, png_size_t num_to_check)
 {
    png_byte png_signature[8] = {137, 80, 78, 71, 13, 10, 26, 10};
+
    if (num_to_check > 8)
       num_to_check = 8;
+
    else if (num_to_check < 1)
       return (-1);
 
@@ -159,69 +93,37 @@
    return ((int)(png_memcmp(&sig[start], &png_signature[start], num_to_check)));
 }
 
-#if defined(PNG_1_0_X) || defined(PNG_1_2_X)
-/* (Obsolete) function to check signature bytes.  It does not allow one
- * to check a partial signature.  This function might be removed in the
- * future - use png_sig_cmp().  Returns true (nonzero) if the file is a PNG.
- */
-int PNGAPI
-png_check_sig(png_bytep sig, int num)
-{
-  return ((int)!png_sig_cmp(sig, (png_size_t)0, (png_size_t)num));
-}
-#endif
 #endif /* PNG_READ_SUPPORTED */
 
 #if defined(PNG_READ_SUPPORTED) || defined(PNG_WRITE_SUPPORTED)
-/* Function to allocate memory for zlib and clear it to 0. */
-#ifdef PNG_1_0_X
-voidpf PNGAPI
-#else
-voidpf /* private */
-#endif
-png_zalloc(voidpf png_ptr, uInt items, uInt size)
+/* Function to allocate memory for zlib */
+PNG_FUNCTION(voidpf /* PRIVATE */,
+png_zalloc,(voidpf png_ptr, uInt items, uInt size),PNG_ALLOCATED)
 {
    png_voidp ptr;
    png_structp p=(png_structp)png_ptr;
    png_uint_32 save_flags=p->flags;
-   png_uint_32 num_bytes;
+   png_alloc_size_t num_bytes;
 
-   if(png_ptr == NULL) return (NULL);
+   if (png_ptr == NULL)
+      return (NULL);
+
    if (items > PNG_UINT_32_MAX/size)
    {
      png_warning (p, "Potential overflow in png_zalloc()");
      return (NULL);
    }
-   num_bytes = (png_uint_32)items * size;
+   num_bytes = (png_alloc_size_t)items * size;
 
    p->flags|=PNG_FLAG_MALLOC_NULL_MEM_OK;
    ptr = (png_voidp)png_malloc((png_structp)png_ptr, num_bytes);
    p->flags=save_flags;
 
-#if defined(PNG_1_0_X) && !defined(PNG_NO_ZALLOC_ZERO)
-   if (ptr == NULL)
-       return ((voidpf)ptr);
-
-   if (num_bytes > (png_uint_32)0x8000L)
-   {
-      png_memset(ptr, 0, (png_size_t)0x8000L);
-      png_memset((png_bytep)ptr + (png_size_t)0x8000L, 0,
-         (png_size_t)(num_bytes - (png_uint_32)0x8000L));
-   }
-   else
-   {
-      png_memset(ptr, 0, (png_size_t)num_bytes);
-   }
-#endif
    return ((voidpf)ptr);
 }
 
-/* function to free memory for zlib */
-#ifdef PNG_1_0_X
-void PNGAPI
-#else
-void /* private */
-#endif
+/* Function to free memory for zlib */
+void /* PRIVATE */
 png_zfree(voidpf png_ptr, voidpf ptr)
 {
    png_free((png_structp)png_ptr, (png_voidp)ptr);
@@ -242,7 +144,7 @@
  * trouble of calculating it.
  */
 void /* PRIVATE */
-png_calculate_crc(png_structp png_ptr, png_bytep ptr, png_size_t length)
+png_calculate_crc(png_structp png_ptr, png_const_bytep ptr, png_size_t length)
 {
    int need_crc = 1;
 
@@ -252,6 +154,7 @@
           (PNG_FLAG_CRC_ANCILLARY_USE | PNG_FLAG_CRC_ANCILLARY_NOWARN))
          need_crc = 0;
    }
+
    else                                                    /* critical */
    {
       if (png_ptr->flags & PNG_FLAG_CRC_CRITICAL_IGNORE)
@@ -262,19 +165,77 @@
       png_ptr->crc = crc32(png_ptr->crc, ptr, (uInt)length);
 }
 
+/* Check a user supplied version number, called from both read and write
+ * functions that create a png_struct
+ */
+int
+png_user_version_check(png_structp png_ptr, png_const_charp user_png_ver)
+{
+   if (user_png_ver)
+   {
+      int i = 0;
+
+      do
+      {
+         if (user_png_ver[i] != png_libpng_ver[i])
+            png_ptr->flags |= PNG_FLAG_LIBRARY_MISMATCH;
+      } while (png_libpng_ver[i++]);
+   }
+
+   else
+      png_ptr->flags |= PNG_FLAG_LIBRARY_MISMATCH;
+
+   if (png_ptr->flags & PNG_FLAG_LIBRARY_MISMATCH)
+   {
+     /* Libpng 0.90 and later are binary incompatible with libpng 0.89, so
+      * we must recompile any applications that use any older library version.
+      * For versions after libpng 1.0, we will be compatible, so we need
+      * only check the first digit.
+      */
+      if (user_png_ver == NULL || user_png_ver[0] != png_libpng_ver[0] ||
+          (user_png_ver[0] == '1' && user_png_ver[2] != png_libpng_ver[2]) ||
+          (user_png_ver[0] == '0' && user_png_ver[2] < '9'))
+      {
+#ifdef PNG_WARNINGS_SUPPORTED
+         size_t pos = 0;
+         char m[128];
+
+         pos = png_safecat(m, sizeof m, pos, "Application built with libpng-");
+         pos = png_safecat(m, sizeof m, pos, user_png_ver);
+         pos = png_safecat(m, sizeof m, pos, " but running with ");
+         pos = png_safecat(m, sizeof m, pos, png_libpng_ver);
+
+         png_warning(png_ptr, m);
+#endif
+
+#ifdef PNG_ERROR_NUMBERS_SUPPORTED
+         png_ptr->flags = 0;
+#endif
+
+         return 0;
+      }
+   }
+
+   /* Success return. */
+   return 1;
+}
+
 /* Allocate the memory for an info_struct for the application.  We don't
  * really need the png_ptr, but it could potentially be useful in the
  * future.  This should be used in favour of malloc(png_sizeof(png_info))
  * and png_info_init() so that applications that want to use a shared
  * libpng don't have to be recompiled if png_info changes size.
  */
-png_infop PNGAPI
-png_create_info_struct(png_structp png_ptr)
+PNG_FUNCTION(png_infop,PNGAPI
+png_create_info_struct,(png_structp png_ptr),PNG_ALLOCATED)
 {
    png_infop info_ptr;
 
-   png_debug(1, "in png_create_info_struct\n");
-   if(png_ptr == NULL) return (NULL);
+   png_debug(1, "in png_create_info_struct");
+
+   if (png_ptr == NULL)
+      return (NULL);
+
 #ifdef PNG_USER_MEM_SUPPORTED
    info_ptr = (png_infop)png_create_struct_2(PNG_STRUCT_INFO,
       png_ptr->malloc_fn, png_ptr->mem_ptr);
@@ -296,9 +257,12 @@
 png_destroy_info_struct(png_structp png_ptr, png_infopp info_ptr_ptr)
 {
    png_infop info_ptr = NULL;
-   if(png_ptr == NULL) return;
 
-   png_debug(1, "in png_destroy_info_struct\n");
+   png_debug(1, "in png_destroy_info_struct");
+
+   if (png_ptr == NULL)
+      return;
+
    if (info_ptr_ptr != NULL)
       info_ptr = *info_ptr_ptr;
 
@@ -320,302 +284,248 @@
  * and applications using it are urged to use png_create_info_struct()
  * instead.
  */
-#if defined(PNG_1_0_X) || defined(PNG_1_2_X)
-#undef png_info_init
-void PNGAPI
-png_info_init(png_infop info_ptr)
-{
-   /* We only come here via pre-1.0.12-compiled applications */
-   png_info_init_3(&info_ptr, 0);
-}
-#endif
 
 void PNGAPI
 png_info_init_3(png_infopp ptr_ptr, png_size_t png_info_struct_size)
 {
    png_infop info_ptr = *ptr_ptr;
 
-   if(info_ptr == NULL) return;
+   png_debug(1, "in png_info_init_3");
 
-   png_debug(1, "in png_info_init_3\n");
+   if (info_ptr == NULL)
+      return;
 
-   if(png_sizeof(png_info) > png_info_struct_size)
-     {
-       png_destroy_struct(info_ptr);
-       info_ptr = (png_infop)png_create_struct(PNG_STRUCT_INFO);
-       *ptr_ptr = info_ptr;
-     }
+   if (png_sizeof(png_info) > png_info_struct_size)
+   {
+      png_destroy_struct(info_ptr);
+      info_ptr = (png_infop)png_create_struct(PNG_STRUCT_INFO);
+      *ptr_ptr = info_ptr;
+   }
 
-   /* set everything to 0 */
-   png_memset(info_ptr, 0, png_sizeof (png_info));
+   /* Set everything to 0 */
+   png_memset(info_ptr, 0, png_sizeof(png_info));
 }
 
-#ifdef PNG_FREE_ME_SUPPORTED
 void PNGAPI
 png_data_freer(png_structp png_ptr, png_infop info_ptr,
    int freer, png_uint_32 mask)
 {
-   png_debug(1, "in png_data_freer\n");
+   png_debug(1, "in png_data_freer");
+
    if (png_ptr == NULL || info_ptr == NULL)
       return;
-   if(freer == PNG_DESTROY_WILL_FREE_DATA)
+
+   if (freer == PNG_DESTROY_WILL_FREE_DATA)
       info_ptr->free_me |= mask;
-   else if(freer == PNG_USER_WILL_FREE_DATA)
+
+   else if (freer == PNG_USER_WILL_FREE_DATA)
       info_ptr->free_me &= ~mask;
+
    else
       png_warning(png_ptr,
-         "Unknown freer parameter in png_data_freer.");
+         "Unknown freer parameter in png_data_freer");
 }
-#endif
 
 void PNGAPI
 png_free_data(png_structp png_ptr, png_infop info_ptr, png_uint_32 mask,
    int num)
 {
-   png_debug(1, "in png_free_data\n");
+   png_debug(1, "in png_free_data");
+
    if (png_ptr == NULL || info_ptr == NULL)
       return;
 
-#if defined(PNG_TEXT_SUPPORTED)
-/* free text item num or (if num == -1) all text items */
-#ifdef PNG_FREE_ME_SUPPORTED
-if ((mask & PNG_FREE_TEXT) & info_ptr->free_me)
-#else
-if (mask & PNG_FREE_TEXT)
-#endif
-{
-   if (num != -1)
+#ifdef PNG_TEXT_SUPPORTED
+   /* Free text item num or (if num == -1) all text items */
+   if ((mask & PNG_FREE_TEXT) & info_ptr->free_me)
    {
-     if (info_ptr->text && info_ptr->text[num].key)
-     {
-         png_free(png_ptr, info_ptr->text[num].key);
-         info_ptr->text[num].key = NULL;
-     }
+      if (num != -1)
+      {
+         if (info_ptr->text && info_ptr->text[num].key)
+         {
+            png_free(png_ptr, info_ptr->text[num].key);
+            info_ptr->text[num].key = NULL;
+         }
+      }
+
+      else
+      {
+         int i;
+         for (i = 0; i < info_ptr->num_text; i++)
+             png_free_data(png_ptr, info_ptr, PNG_FREE_TEXT, i);
+         png_free(png_ptr, info_ptr->text);
+         info_ptr->text = NULL;
+         info_ptr->num_text=0;
+      }
    }
-   else
-   {
-       int i;
-       for (i = 0; i < info_ptr->num_text; i++)
-           png_free_data(png_ptr, info_ptr, PNG_FREE_TEXT, i);
-       png_free(png_ptr, info_ptr->text);
-       info_ptr->text = NULL;
-       info_ptr->num_text=0;
-   }
-}
 #endif
 
-#if defined(PNG_tRNS_SUPPORTED)
-/* free any tRNS entry */
-#ifdef PNG_FREE_ME_SUPPORTED
-if ((mask & PNG_FREE_TRNS) & info_ptr->free_me)
-#else
-if ((mask & PNG_FREE_TRNS) && (png_ptr->flags & PNG_FLAG_FREE_TRNS))
-#endif
-{
-    png_free(png_ptr, info_ptr->trans);
-    info_ptr->valid &= ~PNG_INFO_tRNS;
-#ifndef PNG_FREE_ME_SUPPORTED
-    png_ptr->flags &= ~PNG_FLAG_FREE_TRNS;
-#endif
-    info_ptr->trans = NULL;
-}
+#ifdef PNG_tRNS_SUPPORTED
+   /* Free any tRNS entry */
+   if ((mask & PNG_FREE_TRNS) & info_ptr->free_me)
+   {
+      png_free(png_ptr, info_ptr->trans_alpha);
+      info_ptr->trans_alpha = NULL;
+      info_ptr->valid &= ~PNG_INFO_tRNS;
+   }
 #endif
 
-#if defined(PNG_sCAL_SUPPORTED)
-/* free any sCAL entry */
-#ifdef PNG_FREE_ME_SUPPORTED
-if ((mask & PNG_FREE_SCAL) & info_ptr->free_me)
-#else
-if (mask & PNG_FREE_SCAL)
-#endif
-{
-#if defined(PNG_FIXED_POINT_SUPPORTED) && !defined(PNG_FLOATING_POINT_SUPPORTED)
-    png_free(png_ptr, info_ptr->scal_s_width);
-    png_free(png_ptr, info_ptr->scal_s_height);
-    info_ptr->scal_s_width = NULL;
-    info_ptr->scal_s_height = NULL;
-#endif
-    info_ptr->valid &= ~PNG_INFO_sCAL;
-}
+#ifdef PNG_sCAL_SUPPORTED
+   /* Free any sCAL entry */
+   if ((mask & PNG_FREE_SCAL) & info_ptr->free_me)
+   {
+      png_free(png_ptr, info_ptr->scal_s_width);
+      png_free(png_ptr, info_ptr->scal_s_height);
+      info_ptr->scal_s_width = NULL;
+      info_ptr->scal_s_height = NULL;
+      info_ptr->valid &= ~PNG_INFO_sCAL;
+   }
 #endif
 
-#if defined(PNG_pCAL_SUPPORTED)
-/* free any pCAL entry */
-#ifdef PNG_FREE_ME_SUPPORTED
-if ((mask & PNG_FREE_PCAL) & info_ptr->free_me)
-#else
-if (mask & PNG_FREE_PCAL)
-#endif
-{
-    png_free(png_ptr, info_ptr->pcal_purpose);
-    png_free(png_ptr, info_ptr->pcal_units);
-    info_ptr->pcal_purpose = NULL;
-    info_ptr->pcal_units = NULL;
-    if (info_ptr->pcal_params != NULL)
-    {
-        int i;
-        for (i = 0; i < (int)info_ptr->pcal_nparams; i++)
-        {
-          png_free(png_ptr, info_ptr->pcal_params[i]);
-          info_ptr->pcal_params[i]=NULL;
-        }
-        png_free(png_ptr, info_ptr->pcal_params);
-        info_ptr->pcal_params = NULL;
-    }
-    info_ptr->valid &= ~PNG_INFO_pCAL;
-}
+#ifdef PNG_pCAL_SUPPORTED
+   /* Free any pCAL entry */
+   if ((mask & PNG_FREE_PCAL) & info_ptr->free_me)
+   {
+      png_free(png_ptr, info_ptr->pcal_purpose);
+      png_free(png_ptr, info_ptr->pcal_units);
+      info_ptr->pcal_purpose = NULL;
+      info_ptr->pcal_units = NULL;
+      if (info_ptr->pcal_params != NULL)
+         {
+            int i;
+            for (i = 0; i < (int)info_ptr->pcal_nparams; i++)
+            {
+               png_free(png_ptr, info_ptr->pcal_params[i]);
+               info_ptr->pcal_params[i] = NULL;
+            }
+            png_free(png_ptr, info_ptr->pcal_params);
+            info_ptr->pcal_params = NULL;
+         }
+      info_ptr->valid &= ~PNG_INFO_pCAL;
+   }
 #endif
 
-#if defined(PNG_iCCP_SUPPORTED)
-/* free any iCCP entry */
-#ifdef PNG_FREE_ME_SUPPORTED
-if ((mask & PNG_FREE_ICCP) & info_ptr->free_me)
-#else
-if (mask & PNG_FREE_ICCP)
-#endif
-{
-    png_free(png_ptr, info_ptr->iccp_name);
-    png_free(png_ptr, info_ptr->iccp_profile);
-    info_ptr->iccp_name = NULL;
-    info_ptr->iccp_profile = NULL;
-    info_ptr->valid &= ~PNG_INFO_iCCP;
-}
+#ifdef PNG_iCCP_SUPPORTED
+   /* Free any iCCP entry */
+   if ((mask & PNG_FREE_ICCP) & info_ptr->free_me)
+   {
+      png_free(png_ptr, info_ptr->iccp_name);
+      png_free(png_ptr, info_ptr->iccp_profile);
+      info_ptr->iccp_name = NULL;
+      info_ptr->iccp_profile = NULL;
+      info_ptr->valid &= ~PNG_INFO_iCCP;
+   }
 #endif
 
-#if defined(PNG_sPLT_SUPPORTED)
-/* free a given sPLT entry, or (if num == -1) all sPLT entries */
-#ifdef PNG_FREE_ME_SUPPORTED
-if ((mask & PNG_FREE_SPLT) & info_ptr->free_me)
-#else
-if (mask & PNG_FREE_SPLT)
-#endif
-{
-   if (num != -1)
+#ifdef PNG_sPLT_SUPPORTED
+   /* Free a given sPLT entry, or (if num == -1) all sPLT entries */
+   if ((mask & PNG_FREE_SPLT) & info_ptr->free_me)
    {
-      if(info_ptr->splt_palettes)
+      if (num != -1)
       {
-          png_free(png_ptr, info_ptr->splt_palettes[num].name);
-          png_free(png_ptr, info_ptr->splt_palettes[num].entries);
-          info_ptr->splt_palettes[num].name = NULL;
-          info_ptr->splt_palettes[num].entries = NULL;
+         if (info_ptr->splt_palettes)
+         {
+            png_free(png_ptr, info_ptr->splt_palettes[num].name);
+            png_free(png_ptr, info_ptr->splt_palettes[num].entries);
+            info_ptr->splt_palettes[num].name = NULL;
+            info_ptr->splt_palettes[num].entries = NULL;
+         }
+      }
+
+      else
+      {
+         if (info_ptr->splt_palettes_num)
+         {
+            int i;
+            for (i = 0; i < (int)info_ptr->splt_palettes_num; i++)
+               png_free_data(png_ptr, info_ptr, PNG_FREE_SPLT, i);
+
+            png_free(png_ptr, info_ptr->splt_palettes);
+            info_ptr->splt_palettes = NULL;
+            info_ptr->splt_palettes_num = 0;
+         }
+         info_ptr->valid &= ~PNG_INFO_sPLT;
       }
    }
-   else
-   {
-       if(info_ptr->splt_palettes_num)
-       {
-         int i;
-         for (i = 0; i < (int)info_ptr->splt_palettes_num; i++)
-            png_free_data(png_ptr, info_ptr, PNG_FREE_SPLT, i);
-
-         png_free(png_ptr, info_ptr->splt_palettes);
-         info_ptr->splt_palettes = NULL;
-         info_ptr->splt_palettes_num = 0;
-       }
-       info_ptr->valid &= ~PNG_INFO_sPLT;
-   }
-}
 #endif
 
-#if defined(PNG_UNKNOWN_CHUNKS_SUPPORTED)
-  if(png_ptr->unknown_chunk.data)
-  {
-    png_free(png_ptr, png_ptr->unknown_chunk.data);
-    png_ptr->unknown_chunk.data = NULL;
-  }
-#ifdef PNG_FREE_ME_SUPPORTED
-if ((mask & PNG_FREE_UNKN) & info_ptr->free_me)
-#else
-if (mask & PNG_FREE_UNKN)
-#endif
-{
-   if (num != -1)
+#ifdef PNG_UNKNOWN_CHUNKS_SUPPORTED
+   if (png_ptr->unknown_chunk.data)
    {
-       if(info_ptr->unknown_chunks)
-       {
-          png_free(png_ptr, info_ptr->unknown_chunks[num].data);
-          info_ptr->unknown_chunks[num].data = NULL;
-       }
+      png_free(png_ptr, png_ptr->unknown_chunk.data);
+      png_ptr->unknown_chunk.data = NULL;
    }
-   else
+
+   if ((mask & PNG_FREE_UNKN) & info_ptr->free_me)
    {
-       int i;
+      if (num != -1)
+      {
+          if (info_ptr->unknown_chunks)
+          {
+             png_free(png_ptr, info_ptr->unknown_chunks[num].data);
+             info_ptr->unknown_chunks[num].data = NULL;
+          }
+      }
 
-       if(info_ptr->unknown_chunks_num)
-       {
-         for (i = 0; i < (int)info_ptr->unknown_chunks_num; i++)
-            png_free_data(png_ptr, info_ptr, PNG_FREE_UNKN, i);
+      else
+      {
+         int i;
 
-         png_free(png_ptr, info_ptr->unknown_chunks);
-         info_ptr->unknown_chunks = NULL;
-         info_ptr->unknown_chunks_num = 0;
-       }
+         if (info_ptr->unknown_chunks_num)
+         {
+            for (i = 0; i < info_ptr->unknown_chunks_num; i++)
+               png_free_data(png_ptr, info_ptr, PNG_FREE_UNKN, i);
+
+            png_free(png_ptr, info_ptr->unknown_chunks);
+            info_ptr->unknown_chunks = NULL;
+            info_ptr->unknown_chunks_num = 0;
+         }
+      }
    }
-}
 #endif
 
-#if defined(PNG_hIST_SUPPORTED)
-/* free any hIST entry */
-#ifdef PNG_FREE_ME_SUPPORTED
-if ((mask & PNG_FREE_HIST)  & info_ptr->free_me)
-#else
-if ((mask & PNG_FREE_HIST) && (png_ptr->flags & PNG_FLAG_FREE_HIST))
-#endif
-{
-    png_free(png_ptr, info_ptr->hist);
-    info_ptr->hist = NULL;
-    info_ptr->valid &= ~PNG_INFO_hIST;
-#ifndef PNG_FREE_ME_SUPPORTED
-    png_ptr->flags &= ~PNG_FLAG_FREE_HIST;
-#endif
-}
+#ifdef PNG_hIST_SUPPORTED
+   /* Free any hIST entry */
+   if ((mask & PNG_FREE_HIST)  & info_ptr->free_me)
+   {
+      png_free(png_ptr, info_ptr->hist);
+      info_ptr->hist = NULL;
+      info_ptr->valid &= ~PNG_INFO_hIST;
+   }
 #endif
 
-/* free any PLTE entry that was internally allocated */
-#ifdef PNG_FREE_ME_SUPPORTED
-if ((mask & PNG_FREE_PLTE) & info_ptr->free_me)
-#else
-if ((mask & PNG_FREE_PLTE) && (png_ptr->flags & PNG_FLAG_FREE_PLTE))
-#endif
-{
-    png_zfree(png_ptr, info_ptr->palette);
-    info_ptr->palette = NULL;
-    info_ptr->valid &= ~PNG_INFO_PLTE;
-#ifndef PNG_FREE_ME_SUPPORTED
-    png_ptr->flags &= ~PNG_FLAG_FREE_PLTE;
-#endif
-    info_ptr->num_palette = 0;
-}
+   /* Free any PLTE entry that was internally allocated */
+   if ((mask & PNG_FREE_PLTE) & info_ptr->free_me)
+   {
+      png_zfree(png_ptr, info_ptr->palette);
+      info_ptr->palette = NULL;
+      info_ptr->valid &= ~PNG_INFO_PLTE;
+      info_ptr->num_palette = 0;
+   }
 
-#if defined(PNG_INFO_IMAGE_SUPPORTED)
-/* free any image bits attached to the info structure */
-#ifdef PNG_FREE_ME_SUPPORTED
-if ((mask & PNG_FREE_ROWS) & info_ptr->free_me)
-#else
-if (mask & PNG_FREE_ROWS)
-#endif
-{
-    if(info_ptr->row_pointers)
-    {
-       int row;
-       for (row = 0; row < (int)info_ptr->height; row++)
-       {
-          png_free(png_ptr, info_ptr->row_pointers[row]);
-          info_ptr->row_pointers[row]=NULL;
-       }
-       png_free(png_ptr, info_ptr->row_pointers);
-       info_ptr->row_pointers=NULL;
-    }
-    info_ptr->valid &= ~PNG_INFO_IDAT;
-}
+#ifdef PNG_INFO_IMAGE_SUPPORTED
+   /* Free any image bits attached to the info structure */
+   if ((mask & PNG_FREE_ROWS) & info_ptr->free_me)
+   {
+      if (info_ptr->row_pointers)
+      {
+         int row;
+         for (row = 0; row < (int)info_ptr->height; row++)
+         {
+            png_free(png_ptr, info_ptr->row_pointers[row]);
+            info_ptr->row_pointers[row] = NULL;
+         }
+         png_free(png_ptr, info_ptr->row_pointers);
+         info_ptr->row_pointers = NULL;
+      }
+      info_ptr->valid &= ~PNG_INFO_IDAT;
+   }
 #endif
 
-#ifdef PNG_FREE_ME_SUPPORTED
-   if(num == -1)
-     info_ptr->free_me &= ~mask;
-   else
-     info_ptr->free_me &= ~(mask & ~PNG_FREE_MUL);
-#endif
+   if (num != -1)
+      mask &= ~PNG_FREE_MUL;
+
+   info_ptr->free_me &= ~mask;
 }
 
 /* This is an internal routine to free any memory that the info struct is
@@ -625,16 +535,16 @@
 void /* PRIVATE */
 png_info_destroy(png_structp png_ptr, png_infop info_ptr)
 {
-   png_debug(1, "in png_info_destroy\n");
+   png_debug(1, "in png_info_destroy");
 
    png_free_data(png_ptr, info_ptr, PNG_FREE_ALL, -1);
 
-#if defined(PNG_UNKNOWN_CHUNKS_SUPPORTED)
+#ifdef PNG_HANDLE_AS_UNKNOWN_SUPPORTED
    if (png_ptr->num_chunk_list)
    {
-       png_free(png_ptr, png_ptr->chunk_list);
-       png_ptr->chunk_list=NULL;
-       png_ptr->num_chunk_list=0;
+      png_free(png_ptr, png_ptr->chunk_list);
+      png_ptr->chunk_list = NULL;
+      png_ptr->num_chunk_list = 0;
    }
 #endif
 
@@ -649,12 +559,14 @@
 png_voidp PNGAPI
 png_get_io_ptr(png_structp png_ptr)
 {
-   if(png_ptr == NULL) return (NULL);
+   if (png_ptr == NULL)
+      return (NULL);
+
    return (png_ptr->io_ptr);
 }
 
 #if defined(PNG_READ_SUPPORTED) || defined(PNG_WRITE_SUPPORTED)
-#if !defined(PNG_NO_STDIO)
+#  ifdef PNG_STDIO_SUPPORTED
 /* Initialize the default input/output functions for the PNG file.  If you
  * use your own read or write routines, you can call either png_set_read_fn()
  * or png_set_write_fn() instead of png_init_io().  If you have defined
@@ -664,81 +576,87 @@
 void PNGAPI
 png_init_io(png_structp png_ptr, png_FILE_p fp)
 {
-   png_debug(1, "in png_init_io\n");
-   if(png_ptr == NULL) return;
+   png_debug(1, "in png_init_io");
+
+   if (png_ptr == NULL)
+      return;
+
    png_ptr->io_ptr = (png_voidp)fp;
 }
-#endif
+#  endif
 
-#if defined(PNG_TIME_RFC1123_SUPPORTED)
+#  ifdef PNG_TIME_RFC1123_SUPPORTED
 /* Convert the supplied time into an RFC 1123 string suitable for use in
  * a "Creation Time" or other text-based time string.
  */
-png_charp PNGAPI
-png_convert_to_rfc1123(png_structp png_ptr, png_timep ptime)
+png_const_charp PNGAPI
+png_convert_to_rfc1123(png_structp png_ptr, png_const_timep ptime)
 {
    static PNG_CONST char short_months[12][4] =
         {"Jan", "Feb", "Mar", "Apr", "May", "Jun",
          "Jul", "Aug", "Sep", "Oct", "Nov", "Dec"};
 
-   if(png_ptr == NULL) return (NULL);
-   if (png_ptr->time_buffer == NULL)
+   if (png_ptr == NULL)
+      return (NULL);
+
    {
-      png_ptr->time_buffer = (png_charp)png_malloc(png_ptr, (png_uint_32)(29*
-         png_sizeof(char)));
+      size_t pos = 0;
+      char number_buf[5]; /* enough for a four digit year */
+
+#     define APPEND_STRING(string)\
+         pos = png_safecat(png_ptr->time_buffer, sizeof png_ptr->time_buffer,\
+            pos, (string))
+#     define APPEND_NUMBER(format, value)\
+         APPEND_STRING(PNG_FORMAT_NUMBER(number_buf, format, (value)))
+#     define APPEND(ch)\
+         if (pos < (sizeof png_ptr->time_buffer)-1)\
+            png_ptr->time_buffer[pos++] = (ch)
+
+      APPEND_NUMBER(PNG_NUMBER_FORMAT_u, (unsigned)ptime->day % 32);
+      APPEND(' ');
+      APPEND_STRING(short_months[(ptime->month - 1) % 12]);
+      APPEND(' ');
+      APPEND_NUMBER(PNG_NUMBER_FORMAT_u, ptime->year);
+      APPEND(' ');
+      APPEND_NUMBER(PNG_NUMBER_FORMAT_02u, (unsigned)ptime->hour % 24);
+      APPEND(':');
+      APPEND_NUMBER(PNG_NUMBER_FORMAT_02u, (unsigned)ptime->minute % 60);
+      APPEND(':');
+      APPEND_NUMBER(PNG_NUMBER_FORMAT_02u, (unsigned)ptime->second % 61);
+      APPEND_STRING(" +0000"); /* This reliably terminates the buffer */
+
+#     undef APPEND
+#     undef APPEND_NUMBER
+#     undef APPEND_STRING
    }
 
-#if defined(_WIN32_WCE)
-   {
-      wchar_t time_buf[29];
-      wsprintf(time_buf, TEXT("%d %S %d %02d:%02d:%02d +0000"),
-          ptime->day % 32, short_months[(ptime->month - 1) % 12],
-        ptime->year, ptime->hour % 24, ptime->minute % 60,
-          ptime->second % 61);
-      WideCharToMultiByte(CP_ACP, 0, time_buf, -1, png_ptr->time_buffer, 29,
-          NULL, NULL);
-   }
-#else
-#ifdef USE_FAR_KEYWORD
-   {
-      char near_time_buf[29];
-      sprintf(near_time_buf, "%d %s %d %02d:%02d:%02d +0000",
-          ptime->day % 32, short_months[(ptime->month - 1) % 12],
-          ptime->year, ptime->hour % 24, ptime->minute % 60,
-          ptime->second % 61);
-      png_memcpy(png_ptr->time_buffer, near_time_buf,
-          29*png_sizeof(char));
-   }
-#else
-   sprintf(png_ptr->time_buffer, "%d %s %d %02d:%02d:%02d +0000",
-       ptime->day % 32, short_months[(ptime->month - 1) % 12],
-       ptime->year, ptime->hour % 24, ptime->minute % 60,
-       ptime->second % 61);
-#endif
-#endif /* _WIN32_WCE */
-   return ((png_charp)png_ptr->time_buffer);
+   return png_ptr->time_buffer;
 }
-#endif /* PNG_TIME_RFC1123_SUPPORTED */
+#  endif /* PNG_TIME_RFC1123_SUPPORTED */
 
-#if 0
-/* Signature string for a PNG file. */
-png_bytep PNGAPI
-png_sig_bytes(void)
-{
-   return ((png_bytep)"\211\120\116\107\015\012\032\012");
-}
-#endif
 #endif /* defined(PNG_READ_SUPPORTED) || defined(PNG_WRITE_SUPPORTED) */
 
-png_charp PNGAPI
-png_get_copyright(png_structp png_ptr)
+png_const_charp PNGAPI
+png_get_copyright(png_const_structp png_ptr)
 {
-   if (&png_ptr != NULL)  /* silence compiler warning about unused png_ptr */
-   return ((png_charp) "\n libpng version 1.2.18 - May 15, 2007\n\
-   Copyright (c) 1998-2007 Glenn Randers-Pehrson\n\
-   Copyright (c) 1996-1997 Andreas Dilger\n\
-   Copyright (c) 1995-1996 Guy Eric Schalnat, Group 42, Inc.\n");
-   return ((png_charp) "");
+   PNG_UNUSED(png_ptr)  /* Silence compiler warning about unused png_ptr */
+#ifdef PNG_STRING_COPYRIGHT
+   return PNG_STRING_COPYRIGHT
+#else
+#  ifdef __STDC__
+   return PNG_STRING_NEWLINE \
+     "libpng version 1.5.4 - July 7, 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 1.5.4 - July 7, 2011\
+      Copyright (c) 1998-2011 Glenn Randers-Pehrson\
+      Copyright (c) 1996-1997 Andreas Dilger\
+      Copyright (c) 1995-1996 Guy Eric Schalnat, Group 42, Inc.";
+#  endif
+#endif
 }
 
 /* The following return the library version as a short string in the
@@ -749,141 +667,1784 @@
  * png_get_header_ver().  Due to the version_nn_nn_nn typedef guard,
  * it is guaranteed that png.c uses the correct version of png.h.
  */
-png_charp PNGAPI
-png_get_libpng_ver(png_structp png_ptr)
+png_const_charp PNGAPI
+png_get_libpng_ver(png_const_structp png_ptr)
 {
    /* Version of *.c files used when building libpng */
-   if (&png_ptr != NULL)  /* silence compiler warning about unused png_ptr */
-      return ((png_charp) PNG_LIBPNG_VER_STRING);
-   return ((png_charp) "");
+   return png_get_header_ver(png_ptr);
 }
 
-png_charp PNGAPI
-png_get_header_ver(png_structp png_ptr)
+png_const_charp PNGAPI
+png_get_header_ver(png_const_structp png_ptr)
 {
    /* Version of *.h files used when building libpng */
-   if (&png_ptr != NULL)  /* silence compiler warning about unused png_ptr */
-      return ((png_charp) PNG_LIBPNG_VER_STRING);
-   return ((png_charp) "");
+   PNG_UNUSED(png_ptr)  /* Silence compiler warning about unused png_ptr */
+   return PNG_LIBPNG_VER_STRING;
 }
 
-png_charp PNGAPI
-png_get_header_version(png_structp png_ptr)
+png_const_charp PNGAPI
+png_get_header_version(png_const_structp png_ptr)
 {
    /* Returns longer string containing both version and date */
-   if (&png_ptr != NULL)  /* silence compiler warning about unused png_ptr */
-      return ((png_charp) PNG_HEADER_VERSION_STRING);
-   return ((png_charp) "");
+   PNG_UNUSED(png_ptr)  /* Silence compiler warning about unused png_ptr */
+#ifdef __STDC__
+   return PNG_HEADER_VERSION_STRING
+#  ifndef PNG_READ_SUPPORTED
+   "     (NO READ SUPPORT)"
+#  endif
+   PNG_STRING_NEWLINE;
+#else
+   return PNG_HEADER_VERSION_STRING;
+#endif
 }
 
 #if defined(PNG_READ_SUPPORTED) || defined(PNG_WRITE_SUPPORTED)
-#ifdef PNG_HANDLE_AS_UNKNOWN_SUPPORTED
+#  ifdef PNG_HANDLE_AS_UNKNOWN_SUPPORTED
 int PNGAPI
-png_handle_as_unknown(png_structp png_ptr, png_bytep chunk_name)
+png_handle_as_unknown(png_structp png_ptr, png_const_bytep chunk_name)
 {
-   /* check chunk_name and return "keep" value if it's on the list, else 0 */
+   /* Check chunk_name and return "keep" value if it's on the list, else 0 */
    int i;
    png_bytep p;
-   if((png_ptr == NULL && chunk_name == NULL) || png_ptr->num_chunk_list<=0)
+   if (png_ptr == NULL || chunk_name == NULL || png_ptr->num_chunk_list<=0)
       return 0;
-   p=png_ptr->chunk_list+png_ptr->num_chunk_list*5-5;
-   for (i = png_ptr->num_chunk_list; i; i--, p-=5)
+
+   p = png_ptr->chunk_list + png_ptr->num_chunk_list*5 - 5;
+   for (i = png_ptr->num_chunk_list; i; i--, p -= 5)
       if (!png_memcmp(chunk_name, p, 4))
-        return ((int)*(p+4));
+        return ((int)*(p + 4));
    return 0;
 }
-#endif
+#  endif
+#endif /* defined(PNG_READ_SUPPORTED) || defined(PNG_WRITE_SUPPORTED) */
 
+#ifdef PNG_READ_SUPPORTED
 /* This function, added to libpng-1.0.6g, is untested. */
 int PNGAPI
 png_reset_zstream(png_structp png_ptr)
 {
-   if (png_ptr == NULL) return Z_STREAM_ERROR;
+   if (png_ptr == NULL)
+      return Z_STREAM_ERROR;
+
    return (inflateReset(&png_ptr->zstream));
 }
-#endif /* defined(PNG_READ_SUPPORTED) || defined(PNG_WRITE_SUPPORTED) */
+#endif /* PNG_READ_SUPPORTED */
 
 /* This function was added to libpng-1.0.7 */
 png_uint_32 PNGAPI
 png_access_version_number(void)
 {
    /* Version of *.c files used when building libpng */
-   return((png_uint_32) PNG_LIBPNG_VER);
+   return((png_uint_32)PNG_LIBPNG_VER);
 }
 
 
-#if defined(PNG_READ_SUPPORTED) && defined(PNG_ASSEMBLER_CODE_SUPPORTED)
-#if !defined(PNG_1_0_X)
-#if defined(PNG_MMX_CODE_SUPPORTED)
-/* this INTERNAL function was added to libpng 1.2.0 */
-void /* PRIVATE */
-png_init_mmx_flags (png_structp png_ptr)
-{
-    if(png_ptr == NULL) return;
-    png_ptr->mmx_rowbytes_threshold = 0;
-    png_ptr->mmx_bitdepth_threshold = 0;
-
-#  if (defined(PNG_USE_PNGVCRD) || defined(PNG_USE_PNGGCCRD))
-
-    png_ptr->asm_flags |= PNG_ASM_FLAG_MMX_SUPPORT_COMPILED;
-
-    if (png_mmx_support() > 0) {
-        png_ptr->asm_flags |= PNG_ASM_FLAG_MMX_SUPPORT_IN_CPU
-#    ifdef PNG_HAVE_MMX_COMBINE_ROW
-                              | PNG_ASM_FLAG_MMX_READ_COMBINE_ROW
-#    endif
-#    ifdef PNG_HAVE_MMX_READ_INTERLACE
-                              | PNG_ASM_FLAG_MMX_READ_INTERLACE
-#    endif
-#    ifndef PNG_HAVE_MMX_READ_FILTER_ROW
-                              ;
-#    else
-                              | PNG_ASM_FLAG_MMX_READ_FILTER_SUB
-                              | PNG_ASM_FLAG_MMX_READ_FILTER_UP
-                              | PNG_ASM_FLAG_MMX_READ_FILTER_AVG
-                              | PNG_ASM_FLAG_MMX_READ_FILTER_PAETH ;
-
-        png_ptr->mmx_rowbytes_threshold = PNG_MMX_ROWBYTES_THRESHOLD_DEFAULT;
-        png_ptr->mmx_bitdepth_threshold = PNG_MMX_BITDEPTH_THRESHOLD_DEFAULT;
-#    endif
-    } else {
-        png_ptr->asm_flags &= ~( PNG_ASM_FLAG_MMX_SUPPORT_IN_CPU
-                               | PNG_MMX_READ_FLAGS
-                               | PNG_MMX_WRITE_FLAGS );
-    }
-
-#  else /* !(PNGVCRD || PNGGCCRD) */
-
-    /* clear all MMX flags; no support is compiled in */
-    png_ptr->asm_flags &= ~( PNG_MMX_FLAGS );
-
-#  endif /* ?(PNGVCRD || PNGGCCRD) */
-}
-
-#endif /* !(PNG_MMX_CODE_SUPPORTED) */
-
-/* this function was added to libpng 1.2.0 */
-#if !defined(PNG_USE_PNGGCCRD) && \
-    !(defined(PNG_MMX_CODE_SUPPORTED) && defined(PNG_USE_PNGVCRD))
-int PNGAPI
-png_mmx_support(void)
-{
-    return -1;
-}
-#endif
-#endif /* PNG_1_0_X  && PNG_ASSEMBLER_CODE_SUPPORTED */
-#endif /* PNG_READ_SUPPORTED */
 
 #if defined(PNG_READ_SUPPORTED) || defined(PNG_WRITE_SUPPORTED)
-#ifdef PNG_SIZE_T
+#  ifdef PNG_SIZE_T
 /* Added at libpng version 1.2.6 */
    PNG_EXTERN png_size_t PNGAPI png_convert_size PNGARG((size_t size));
 png_size_t PNGAPI
 png_convert_size(size_t size)
 {
-  if (size > (png_size_t)-1)
-     PNG_ABORT();  /* We haven't got access to png_ptr, so no png_error() */
-  return ((png_size_t)size);
+   if (size > (png_size_t)-1)
+      PNG_ABORT();  /* We haven't got access to png_ptr, so no png_error() */
+
+   return ((png_size_t)size);
 }
-#endif /* PNG_SIZE_T */
+#  endif /* PNG_SIZE_T */
+
+/* Added at libpng version 1.2.34 and 1.4.0 (moved from pngset.c) */
+#  ifdef PNG_CHECK_cHRM_SUPPORTED
+
+int /* PRIVATE */
+png_check_cHRM_fixed(png_structp png_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)
+{
+   int ret = 1;
+   unsigned long xy_hi,xy_lo,yx_hi,yx_lo;
+
+   png_debug(1, "in function png_check_cHRM_fixed");
+
+   if (png_ptr == NULL)
+      return 0;
+
+   /* (x,y,z) values are first limited to 0..100000 (PNG_FP_1), the white
+    * y must also be greater than 0.  To test for the upper limit calculate
+    * (PNG_FP_1-y) - x must be <= to this for z to be >= 0 (and the expression
+    * cannot overflow.)  At this point we know x and y are >= 0 and (x+y) is
+    * <= PNG_FP_1.  The previous test on PNG_MAX_UINT_31 is removed because it
+    * pointless (and it produces compiler warnings!)
+    */
+   if (white_x < 0 || white_y <= 0 ||
+         red_x < 0 ||   red_y <  0 ||
+       green_x < 0 || green_y <  0 ||
+        blue_x < 0 ||  blue_y <  0)
+   {
+      png_warning(png_ptr,
+        "Ignoring attempt to set negative chromaticity value");
+      ret = 0;
+   }
+   /* And (x+y) must be <= PNG_FP_1 (so z is >= 0) */
+   if (white_x > PNG_FP_1 - white_y)
+   {
+      png_warning(png_ptr, "Invalid cHRM white point");
+      ret = 0;
+   }
+
+   if (red_x > PNG_FP_1 - red_y)
+   {
+      png_warning(png_ptr, "Invalid cHRM red point");
+      ret = 0;
+   }
+
+   if (green_x > PNG_FP_1 - green_y)
+   {
+      png_warning(png_ptr, "Invalid cHRM green point");
+      ret = 0;
+   }
+
+   if (blue_x > PNG_FP_1 - blue_y)
+   {
+      png_warning(png_ptr, "Invalid cHRM blue point");
+      ret = 0;
+   }
+
+   png_64bit_product(green_x - red_x, blue_y - red_y, &xy_hi, &xy_lo);
+   png_64bit_product(green_y - red_y, blue_x - red_x, &yx_hi, &yx_lo);
+
+   if (xy_hi == yx_hi && xy_lo == yx_lo)
+   {
+      png_warning(png_ptr,
+         "Ignoring attempt to set cHRM RGB triangle with zero area");
+      ret = 0;
+   }
+
+   return ret;
+}
+#  endif /* PNG_CHECK_cHRM_SUPPORTED */
+
+void /* PRIVATE */
+png_check_IHDR(png_structp png_ptr,
+   png_uint_32 width, png_uint_32 height, int bit_depth,
+   int color_type, int interlace_type, int compression_type,
+   int filter_type)
+{
+   int error = 0;
+
+   /* Check for width and height valid values */
+   if (width == 0)
+   {
+      png_warning(png_ptr, "Image width is zero in IHDR");
+      error = 1;
+   }
+
+   if (height == 0)
+   {
+      png_warning(png_ptr, "Image height is zero in IHDR");
+      error = 1;
+   }
+
+#  ifdef PNG_SET_USER_LIMITS_SUPPORTED
+   if (width > png_ptr->user_width_max)
+
+#  else
+   if (width > PNG_USER_WIDTH_MAX)
+#  endif
+   {
+      png_warning(png_ptr, "Image width exceeds user limit in IHDR");
+      error = 1;
+   }
+
+#  ifdef PNG_SET_USER_LIMITS_SUPPORTED
+   if (height > png_ptr->user_height_max)
+#  else
+   if (height > PNG_USER_HEIGHT_MAX)
+#  endif
+   {
+      png_warning(png_ptr, "Image height exceeds user limit in IHDR");
+      error = 1;
+   }
+
+   if (width > PNG_UINT_31_MAX)
+   {
+      png_warning(png_ptr, "Invalid image width in IHDR");
+      error = 1;
+   }
+
+   if (height > PNG_UINT_31_MAX)
+   {
+      png_warning(png_ptr, "Invalid image height in IHDR");
+      error = 1;
+   }
+
+   if (width > (PNG_UINT_32_MAX
+                 >> 3)      /* 8-byte RGBA pixels */
+                 - 48       /* bigrowbuf hack */
+                 - 1        /* filter byte */
+                 - 7*8      /* rounding of width to multiple of 8 pixels */
+                 - 8)       /* extra max_pixel_depth pad */
+      png_warning(png_ptr, "Width is too large for libpng to process pixels");
+
+   /* Check other values */
+   if (bit_depth != 1 && bit_depth != 2 && bit_depth != 4 &&
+       bit_depth != 8 && bit_depth != 16)
+   {
+      png_warning(png_ptr, "Invalid bit depth in IHDR");
+      error = 1;
+   }
+
+   if (color_type < 0 || color_type == 1 ||
+       color_type == 5 || color_type > 6)
+   {
+      png_warning(png_ptr, "Invalid color type in IHDR");
+      error = 1;
+   }
+
+   if (((color_type == PNG_COLOR_TYPE_PALETTE) && bit_depth > 8) ||
+       ((color_type == PNG_COLOR_TYPE_RGB ||
+         color_type == PNG_COLOR_TYPE_GRAY_ALPHA ||
+         color_type == PNG_COLOR_TYPE_RGB_ALPHA) && bit_depth < 8))
+   {
+      png_warning(png_ptr, "Invalid color type/bit depth combination in IHDR");
+      error = 1;
+   }
+
+   if (interlace_type >= PNG_INTERLACE_LAST)
+   {
+      png_warning(png_ptr, "Unknown interlace method in IHDR");
+      error = 1;
+   }
+
+   if (compression_type != PNG_COMPRESSION_TYPE_BASE)
+   {
+      png_warning(png_ptr, "Unknown compression method in IHDR");
+      error = 1;
+   }
+
+#  ifdef PNG_MNG_FEATURES_SUPPORTED
+   /* Accept filter_method 64 (intrapixel differencing) only if
+    * 1. Libpng was compiled with PNG_MNG_FEATURES_SUPPORTED and
+    * 2. Libpng did not read a PNG signature (this filter_method is only
+    *    used in PNG datastreams that are embedded in MNG datastreams) and
+    * 3. The application called png_permit_mng_features with a mask that
+    *    included PNG_FLAG_MNG_FILTER_64 and
+    * 4. The filter_method is 64 and
+    * 5. The color_type is RGB or RGBA
+    */
+   if ((png_ptr->mode & PNG_HAVE_PNG_SIGNATURE) &&
+       png_ptr->mng_features_permitted)
+      png_warning(png_ptr, "MNG features are not allowed in a PNG datastream");
+
+   if (filter_type != PNG_FILTER_TYPE_BASE)
+   {
+      if (!((png_ptr->mng_features_permitted & PNG_FLAG_MNG_FILTER_64) &&
+          (filter_type == PNG_INTRAPIXEL_DIFFERENCING) &&
+          ((png_ptr->mode & PNG_HAVE_PNG_SIGNATURE) == 0) &&
+          (color_type == PNG_COLOR_TYPE_RGB ||
+          color_type == PNG_COLOR_TYPE_RGB_ALPHA)))
+      {
+         png_warning(png_ptr, "Unknown filter method in IHDR");
+         error = 1;
+      }
+
+      if (png_ptr->mode & PNG_HAVE_PNG_SIGNATURE)
+      {
+         png_warning(png_ptr, "Invalid filter method in IHDR");
+         error = 1;
+      }
+   }
+
+#  else
+   if (filter_type != PNG_FILTER_TYPE_BASE)
+   {
+      png_warning(png_ptr, "Unknown filter method in IHDR");
+      error = 1;
+   }
+#  endif
+
+   if (error == 1)
+      png_error(png_ptr, "Invalid IHDR data");
+}
+
+#if defined(PNG_sCAL_SUPPORTED) || defined(PNG_pCAL_SUPPORTED)
+/* ASCII to fp functions */
+/* Check an ASCII formated floating point value, see the more detailed
+ * comments in pngpriv.h
+ */
+/* The following is used internally to preserve the sticky flags */
+#define png_fp_add(state, flags) ((state) |= (flags))
+#define png_fp_set(state, value) ((state) = (value) | ((state) & PNG_FP_STICKY))
+
+int /* PRIVATE */
+png_check_fp_number(png_const_charp string, png_size_t size, int *statep,
+   png_size_tp whereami)
+{
+   int state = *statep;
+   png_size_t i = *whereami;
+
+   while (i < size)
+   {
+      int type;
+      /* First find the type of the next character */
+      switch (string[i])
+      {
+      case 43:  type = PNG_FP_SAW_SIGN;                   break;
+      case 45:  type = PNG_FP_SAW_SIGN + PNG_FP_NEGATIVE; break;
+      case 46:  type = PNG_FP_SAW_DOT;                    break;
+      case 48:  type = PNG_FP_SAW_DIGIT;                  break;
+      case 49: case 50: case 51: case 52:
+      case 53: case 54: case 55: case 56:
+      case 57:  type = PNG_FP_SAW_DIGIT + PNG_FP_NONZERO; break;
+      case 69:
+      case 101: type = PNG_FP_SAW_E;                      break;
+      default:  goto PNG_FP_End;
+      }
+
+      /* Now deal with this type according to the current
+       * state, the type is arranged to not overlap the
+       * bits of the PNG_FP_STATE.
+       */
+      switch ((state & PNG_FP_STATE) + (type & PNG_FP_SAW_ANY))
+      {
+      case PNG_FP_INTEGER + PNG_FP_SAW_SIGN:
+         if (state & PNG_FP_SAW_ANY)
+            goto PNG_FP_End; /* not a part of the number */
+
+         png_fp_add(state, type);
+         break;
+
+      case PNG_FP_INTEGER + PNG_FP_SAW_DOT:
+         /* Ok as trailer, ok as lead of fraction. */
+         if (state & PNG_FP_SAW_DOT) /* two dots */
+            goto PNG_FP_End;
+
+         else if (state & PNG_FP_SAW_DIGIT) /* trailing dot? */
+            png_fp_add(state, type);
+
+         else
+            png_fp_set(state, PNG_FP_FRACTION | type);
+
+         break;
+
+      case PNG_FP_INTEGER + PNG_FP_SAW_DIGIT:
+         if (state & PNG_FP_SAW_DOT) /* delayed fraction */
+            png_fp_set(state, PNG_FP_FRACTION | PNG_FP_SAW_DOT);
+
+         png_fp_add(state, type | PNG_FP_WAS_VALID);
+
+         break;
+
+      case PNG_FP_INTEGER + PNG_FP_SAW_E:
+         if ((state & PNG_FP_SAW_DIGIT) == 0)
+            goto PNG_FP_End;
+
+         png_fp_set(state, PNG_FP_EXPONENT);
+
+         break;
+
+   /* case PNG_FP_FRACTION + PNG_FP_SAW_SIGN:
+         goto PNG_FP_End; ** no sign in fraction */
+
+   /* case PNG_FP_FRACTION + PNG_FP_SAW_DOT:
+         goto PNG_FP_End; ** Because SAW_DOT is always set */
+
+      case PNG_FP_FRACTION + PNG_FP_SAW_DIGIT:
+         png_fp_add(state, type | PNG_FP_WAS_VALID);
+         break;
+
+      case PNG_FP_FRACTION + PNG_FP_SAW_E:
+         /* This is correct because the trailing '.' on an
+          * integer is handled above - so we can only get here
+          * with the sequence ".E" (with no preceding digits).
+          */
+         if ((state & PNG_FP_SAW_DIGIT) == 0)
+            goto PNG_FP_End;
+
+         png_fp_set(state, PNG_FP_EXPONENT);
+
+         break;
+
+      case PNG_FP_EXPONENT + PNG_FP_SAW_SIGN:
+         if (state & PNG_FP_SAW_ANY)
+            goto PNG_FP_End; /* not a part of the number */
+
+         png_fp_add(state, PNG_FP_SAW_SIGN);
+
+         break;
+
+   /* case PNG_FP_EXPONENT + PNG_FP_SAW_DOT:
+         goto PNG_FP_End; */
+
+      case PNG_FP_EXPONENT + PNG_FP_SAW_DIGIT:
+         png_fp_add(state, PNG_FP_SAW_DIGIT | PNG_FP_WAS_VALID);
+
+         break;
+
+   /* case PNG_FP_EXPONEXT + PNG_FP_SAW_E:
+         goto PNG_FP_End; */
+
+      default: goto PNG_FP_End; /* I.e. break 2 */
+      }
+
+      /* The character seems ok, continue. */
+      ++i;
+   }
+
+PNG_FP_End:
+   /* Here at the end, update the state and return the correct
+    * return code.
+    */
+   *statep = state;
+   *whereami = i;
+
+   return (state & PNG_FP_SAW_DIGIT) != 0;
+}
+
+
+/* The same but for a complete string. */
+int
+png_check_fp_string(png_const_charp string, png_size_t size)
+{
+   int        state=0;
+   png_size_t char_index=0;
+
+   if (png_check_fp_number(string, size, &state, &char_index) &&
+      (char_index == size || string[char_index] == 0))
+      return state /* must be non-zero - see above */;
+
+   return 0; /* i.e. fail */
+}
+#endif /* pCAL or sCAL */
+
+#ifdef PNG_READ_sCAL_SUPPORTED
+#  ifdef PNG_FLOATING_POINT_SUPPORTED
+/* Utility used below - a simple accurate power of ten from an integral
+ * exponent.
+ */
+static double
+png_pow10(int power)
+{
+   int recip = 0;
+   double d = 1;
+
+   /* Handle negative exponent with a reciprocal at the end because
+    * 10 is exact whereas .1 is inexact in base 2
+    */
+   if (power < 0)
+   {
+      if (power < DBL_MIN_10_EXP) return 0;
+      recip = 1, power = -power;
+   }
+
+   if (power > 0)
+   {
+      /* Decompose power bitwise. */
+      double mult = 10;
+      do
+      {
+         if (power & 1) d *= mult;
+         mult *= mult;
+         power >>= 1;
+      }
+      while (power > 0);
+
+      if (recip) d = 1/d;
+   }
+   /* else power is 0 and d is 1 */
+
+   return d;
+}
+
+/* Function to format a floating point value in ASCII with a given
+ * precision.
+ */
+void /* PRIVATE */
+png_ascii_from_fp(png_structp png_ptr, png_charp ascii, png_size_t size,
+    double fp, unsigned int precision)
+{
+   /* We use standard functions from math.h, but not printf because
+    * that would require stdio.  The caller must supply a buffer of
+    * sufficient size or we will png_error.  The tests on size and
+    * the space in ascii[] consumed are indicated below.
+    */
+   if (precision < 1)
+      precision = DBL_DIG;
+
+   /* Enforce the limit of the implementation precision too. */
+   if (precision > DBL_DIG+1)
+      precision = DBL_DIG+1;
+
+   /* Basic sanity checks */
+   if (size >= precision+5) /* See the requirements below. */
+   {
+      if (fp < 0)
+      {
+         fp = -fp;
+         *ascii++ = 45; /* '-'  PLUS 1 TOTAL 1 */
+         --size;
+      }
+
+      if (fp >= DBL_MIN && fp <= DBL_MAX)
+      {
+         int exp_b10;       /* A base 10 exponent */
+         double base;   /* 10^exp_b10 */
+
+         /* First extract a base 10 exponent of the number,
+          * the calculation below rounds down when converting
+          * from base 2 to base 10 (multiply by log10(2) -
+          * 0.3010, but 77/256 is 0.3008, so exp_b10 needs to
+          * be increased.  Note that the arithmetic shift
+          * performs a floor() unlike C arithmetic - using a
+          * C multiply would break the following for negative
+          * exponents.
+          */
+         (void)frexp(fp, &exp_b10); /* exponent to base 2 */
+
+         exp_b10 = (exp_b10 * 77) >> 8; /* <= exponent to base 10 */
+
+         /* Avoid underflow here. */
+         base = png_pow10(exp_b10); /* May underflow */
+
+         while (base < DBL_MIN || base < fp)
+         {
+            /* And this may overflow. */
+            double test = png_pow10(exp_b10+1);
+
+            if (test <= DBL_MAX)
+               ++exp_b10, base = test;
+
+            else
+               break;
+         }
+
+         /* Normalize fp and correct exp_b10, after this fp is in the
+          * range [.1,1) and exp_b10 is both the exponent and the digit
+          * *before* which the decimal point should be inserted
+          * (starting with 0 for the first digit).  Note that this
+          * works even if 10^exp_b10 is out of range because of the
+          * test on DBL_MAX above.
+          */
+         fp /= base;
+         while (fp >= 1) fp /= 10, ++exp_b10;
+
+         /* Because of the code above fp may, at this point, be
+          * less than .1, this is ok because the code below can
+          * handle the leading zeros this generates, so no attempt
+          * is made to correct that here.
+          */
+
+         {
+            int czero, clead, cdigits;
+            char exponent[10];
+
+            /* Allow up to two leading zeros - this will not lengthen
+             * the number compared to using E-n.
+             */
+            if (exp_b10 < 0 && exp_b10 > -3) /* PLUS 3 TOTAL 4 */
+            {
+               czero = -exp_b10; /* PLUS 2 digits: TOTAL 3 */
+               exp_b10 = 0;      /* Dot added below before first output. */
+            }
+            else
+               czero = 0;    /* No zeros to add */
+
+            /* Generate the digit list, stripping trailing zeros and
+             * inserting a '.' before a digit if the exponent is 0.
+             */
+            clead = czero; /* Count of leading zeros */
+            cdigits = 0;   /* Count of digits in list. */
+
+            do
+            {
+               double d;
+
+               fp *= 10;
+               /* Use modf here, not floor and subtract, so that
+                * the separation is done in one step.  At the end
+                * of the loop don't break the number into parts so
+                * that the final digit is rounded.
+                */
+               if (cdigits+czero-clead+1 < (int)precision)
+                  fp = modf(fp, &d);
+
+               else
+               {
+                  d = floor(fp + .5);
+
+                  if (d > 9)
+                  {
+                     /* Rounding up to 10, handle that here. */
+                     if (czero > 0)
+                     {
+                        --czero, d = 1;
+                        if (cdigits == 0) --clead;
+                     }
+                     else
+                     {
+                        while (cdigits > 0 && d > 9)
+                        {
+                           int ch = *--ascii;
+
+                           if (exp_b10 != (-1))
+                              ++exp_b10;
+
+                           else if (ch == 46)
+                           {
+                              ch = *--ascii, ++size;
+                              /* Advance exp_b10 to '1', so that the
+                               * decimal point happens after the
+                               * previous digit.
+                               */
+                              exp_b10 = 1;
+                           }
+
+                           --cdigits;
+                           d = ch - 47;  /* I.e. 1+(ch-48) */
+                        }
+
+                        /* Did we reach the beginning? If so adjust the
+                         * exponent but take into account the leading
+                         * decimal point.
+                         */
+                        if (d > 9)  /* cdigits == 0 */
+                        {
+                           if (exp_b10 == (-1))
+                           {
+                              /* Leading decimal point (plus zeros?), if
+                               * we lose the decimal point here it must
+                               * be reentered below.
+                               */
+                              int ch = *--ascii;
+
+                              if (ch == 46)
+                                 ++size, exp_b10 = 1;
+
+                              /* Else lost a leading zero, so 'exp_b10' is
+                               * still ok at (-1)
+                               */
+                           }
+                           else
+                              ++exp_b10;
+
+                           /* In all cases we output a '1' */
+                           d = 1;
+                        }
+                     }
+                  }
+                  fp = 0; /* Guarantees termination below. */
+               }
+
+               if (d == 0)
+               {
+                  ++czero;
+                  if (cdigits == 0) ++clead;
+               }
+               else
+               {
+                  /* Included embedded zeros in the digit count. */
+                  cdigits += czero - clead;
+                  clead = 0;
+
+                  while (czero > 0)
+                  {
+                     /* exp_b10 == (-1) means we just output the decimal
+                      * place - after the DP don't adjust 'exp_b10' any
+                      * more!
+                      */
+                     if (exp_b10 != (-1))
+                     {
+                        if (exp_b10 == 0) *ascii++ = 46, --size;
+                        /* PLUS 1: TOTAL 4 */
+                        --exp_b10;
+                     }
+                     *ascii++ = 48, --czero;
+                  }
+
+                  if (exp_b10 != (-1))
+                  {
+                     if (exp_b10 == 0) *ascii++ = 46, --size; /* counted
+                                                                 above */
+                     --exp_b10;
+                  }
+                  *ascii++ = (char)(48 + (int)d), ++cdigits;
+               }
+            }
+            while (cdigits+czero-clead < (int)precision && fp > DBL_MIN);
+
+            /* The total output count (max) is now 4+precision */
+
+            /* Check for an exponent, if we don't need one we are
+             * done and just need to terminate the string.  At
+             * this point exp_b10==(-1) is effectively if flag - it got
+             * to '-1' because of the decrement after outputing
+             * the decimal point above (the exponent required is
+             * *not* -1!)
+             */
+            if (exp_b10 >= (-1) && exp_b10 <= 2)
+            {
+               /* The following only happens if we didn't output the
+                * leading zeros above for negative exponent, so this
+                * doest add to the digit requirement.  Note that the
+                * two zeros here can only be output if the two leading
+                * zeros were *not* output, so this doesn't increase
+                * the output count.
+                */
+               while (--exp_b10 >= 0) *ascii++ = 48;
+
+               *ascii = 0;
+
+               /* Total buffer requirement (including the '\0') is
+                * 5+precision - see check at the start.
+                */
+               return;
+            }
+
+            /* Here if an exponent is required, adjust size for
+             * the digits we output but did not count.  The total
+             * digit output here so far is at most 1+precision - no
+             * decimal point and no leading or trailing zeros have
+             * been output.
+             */
+            size -= cdigits;
+
+            *ascii++ = 69, --size;    /* 'E': PLUS 1 TOTAL 2+precision */
+            if (exp_b10 < 0)
+            {
+               *ascii++ = 45, --size; /* '-': PLUS 1 TOTAL 3+precision */
+               exp_b10 = -exp_b10;
+            }
+
+            cdigits = 0;
+
+            while (exp_b10 > 0)
+            {
+               exponent[cdigits++] = (char)(48 + exp_b10 % 10);
+               exp_b10 /= 10;
+            }
+
+            /* Need another size check here for the exponent digits, so
+             * this need not be considered above.
+             */
+            if ((int)size > cdigits)
+            {
+               while (cdigits > 0) *ascii++ = exponent[--cdigits];
+
+               *ascii = 0;
+
+               return;
+            }
+         }
+      }
+      else if (!(fp >= DBL_MIN))
+      {
+         *ascii++ = 48; /* '0' */
+         *ascii = 0;
+         return;
+      }
+      else
+      {
+         *ascii++ = 105; /* 'i' */
+         *ascii++ = 110; /* 'n' */
+         *ascii++ = 102; /* 'f' */
+         *ascii = 0;
+         return;
+      }
+   }
+
+   /* Here on buffer too small. */
+   png_error(png_ptr, "ASCII conversion buffer too small");
+}
+
+#  endif /* FLOATING_POINT */
+
+#  ifdef PNG_FIXED_POINT_SUPPORTED
+/* Function to format a fixed point value in ASCII.
+ */
+void /* PRIVATE */
+png_ascii_from_fixed(png_structp png_ptr, png_charp ascii, png_size_t size,
+    png_fixed_point fp)
+{
+   /* Require space for 10 decimal digits, a decimal point, a minus sign and a
+    * trailing \0, 13 characters:
+    */
+   if (size > 12)
+   {
+      png_uint_32 num;
+
+      /* Avoid overflow here on the minimum integer. */
+      if (fp < 0)
+         *ascii++ = 45, --size, num = -fp;
+      else
+         num = fp;
+
+      if (num <= 0x80000000U) /* else overflowed */
+      {
+         unsigned int ndigits = 0, first = 16 /* flag value */;
+         char digits[10];
+
+         while (num)
+         {
+            /* Split the low digit off num: */
+            unsigned int tmp = num/10;
+            num -= tmp*10;
+            digits[ndigits++] = (char)(48 + num);
+            /* Record the first non-zero digit, note that this is a number
+             * starting at 1, it's not actually the array index.
+             */
+            if (first == 16 && num > 0)
+               first = ndigits;
+            num = tmp;
+         }
+
+         if (ndigits > 0)
+         {
+            while (ndigits > 5) *ascii++ = digits[--ndigits];
+            /* The remaining digits are fractional digits, ndigits is '5' or
+             * smaller at this point.  It is certainly not zero.  Check for a
+             * non-zero fractional digit:
+             */
+            if (first <= 5)
+            {
+               unsigned int i;
+               *ascii++ = 46; /* decimal point */
+               /* ndigits may be <5 for small numbers, output leading zeros
+                * then ndigits digits to first:
+                */
+               i = 5;
+               while (ndigits < i) *ascii++ = 48, --i;
+               while (ndigits >= first) *ascii++ = digits[--ndigits];
+               /* Don't output the trailing zeros! */
+            }
+         }
+         else
+            *ascii++ = 48;
+
+         /* And null terminate the string: */
+         *ascii = 0;
+         return;
+      }
+   }
+
+   /* Here on buffer too small. */
+   png_error(png_ptr, "ASCII conversion buffer too small");
+}
+#   endif /* FIXED_POINT */
+#endif /* READ_SCAL */
+
+#if defined(PNG_FLOATING_POINT_SUPPORTED) && \
+   !defined(PNG_FIXED_POINT_MACRO_SUPPORTED)
+png_fixed_point
+png_fixed(png_structp png_ptr, double fp, png_const_charp text)
+{
+   double r = floor(100000 * fp + .5);
+
+   if (r > 2147483647. || r < -2147483648.)
+      png_fixed_error(png_ptr, text);
+
+   return (png_fixed_point)r;
+}
+#endif
+
+#if defined(PNG_READ_GAMMA_SUPPORTED) || \
+    defined(PNG_INCH_CONVERSIONS_SUPPORTED) || defined(PNG__READ_pHYs_SUPPORTED)
+/* muldiv functions */
+/* This API takes signed arguments and rounds the result to the nearest
+ * integer (or, for a fixed point number - the standard argument - to
+ * the nearest .00001).  Overflow and divide by zero are signalled in
+ * the result, a boolean - true on success, false on overflow.
+ */
+int
+png_muldiv(png_fixed_point_p res, png_fixed_point a, png_int_32 times,
+    png_int_32 divisor)
+{
+   /* Return a * times / divisor, rounded. */
+   if (divisor != 0)
+   {
+      if (a == 0 || times == 0)
+      {
+         *res = 0;
+         return 1;
+      }
+      else
+      {
+#ifdef PNG_FLOATING_ARITHMETIC_SUPPORTED
+         double r = a;
+         r *= times;
+         r /= divisor;
+         r = floor(r+.5);
+
+         /* A png_fixed_point is a 32-bit integer. */
+         if (r <= 2147483647. && r >= -2147483648.)
+         {
+            *res = (png_fixed_point)r;
+            return 1;
+         }
+#else
+         int negative = 0;
+         png_uint_32 A, T, D;
+         png_uint_32 s16, s32, s00;
+
+         if (a < 0)
+            negative = 1, A = -a;
+         else
+            A = a;
+
+         if (times < 0)
+            negative = !negative, T = -times;
+         else
+            T = times;
+
+         if (divisor < 0)
+            negative = !negative, D = -divisor;
+         else
+            D = divisor;
+
+         /* Following can't overflow because the arguments only
+          * have 31 bits each, however the result may be 32 bits.
+          */
+         s16 = (A >> 16) * (T & 0xffff) +
+                           (A & 0xffff) * (T >> 16);
+         /* Can't overflow because the a*times bit is only 30
+          * bits at most.
+          */
+         s32 = (A >> 16) * (T >> 16) + (s16 >> 16);
+         s00 = (A & 0xffff) * (T & 0xffff);
+
+         s16 = (s16 & 0xffff) << 16;
+         s00 += s16;
+
+         if (s00 < s16)
+            ++s32; /* carry */
+
+         if (s32 < D) /* else overflow */
+         {
+            /* s32.s00 is now the 64-bit product, do a standard
+             * division, we know that s32 < D, so the maximum
+             * required shift is 31.
+             */
+            int bitshift = 32;
+            png_fixed_point result = 0; /* NOTE: signed */
+
+            while (--bitshift >= 0)
+            {
+               png_uint_32 d32, d00;
+
+               if (bitshift > 0)
+                  d32 = D >> (32-bitshift), d00 = D << bitshift;
+
+               else
+                  d32 = 0, d00 = D;
+
+               if (s32 > d32)
+               {
+                  if (s00 < d00) --s32; /* carry */
+                  s32 -= d32, s00 -= d00, result += 1<<bitshift;
+               }
+
+               else
+                  if (s32 == d32 && s00 >= d00)
+                     s32 = 0, s00 -= d00, result += 1<<bitshift;
+            }
+
+            /* Handle the rounding. */
+            if (s00 >= (D >> 1))
+               ++result;
+
+            if (negative)
+               result = -result;
+
+            /* Check for overflow. */
+            if ((negative && result <= 0) || (!negative && result >= 0))
+            {
+               *res = result;
+               return 1;
+            }
+         }
+#endif
+      }
+   }
+
+   return 0;
+}
+#endif /* READ_GAMMA || INCH_CONVERSIONS */
+
+#if defined(PNG_READ_GAMMA_SUPPORTED) || defined(PNG_INCH_CONVERSIONS_SUPPORTED)
+/* The following is for when the caller doesn't much care about the
+ * result.
+ */
+png_fixed_point
+png_muldiv_warn(png_structp png_ptr, png_fixed_point a, png_int_32 times,
+    png_int_32 divisor)
+{
+   png_fixed_point result;
+
+   if (png_muldiv(&result, a, times, divisor))
+      return result;
+
+   png_warning(png_ptr, "fixed point overflow ignored");
+   return 0;
+}
+#endif
+
+#ifdef PNG_READ_GAMMA_SUPPORTED /* more fixed point functions for gammma */
+/* Calculate a reciprocal, return 0 on div-by-zero or overflow. */
+png_fixed_point
+png_reciprocal(png_fixed_point a)
+{
+#ifdef PNG_FLOATING_ARITHMETIC_SUPPORTED
+   double r = floor(1E10/a+.5);
+
+   if (r <= 2147483647. && r >= -2147483648.)
+      return (png_fixed_point)r;
+#else
+   png_fixed_point res;
+
+   if (png_muldiv(&res, 100000, 100000, a))
+      return res;
+#endif
+
+   return 0; /* error/overflow */
+}
+
+/* A local convenience routine. */
+static png_fixed_point
+png_product2(png_fixed_point a, png_fixed_point b)
+{
+   /* The required result is 1/a * 1/b; the following preserves accuracy. */
+#ifdef PNG_FLOATING_ARITHMETIC_SUPPORTED
+   double r = a * 1E-5;
+   r *= b;
+   r = floor(r+.5);
+
+   if (r <= 2147483647. && r >= -2147483648.)
+      return (png_fixed_point)r;
+#else
+   png_fixed_point res;
+
+   if (png_muldiv(&res, a, b, 100000))
+      return res;
+#endif
+
+   return 0; /* overflow */
+}
+
+/* The inverse of the above. */
+png_fixed_point
+png_reciprocal2(png_fixed_point a, png_fixed_point b)
+{
+   /* The required result is 1/a * 1/b; the following preserves accuracy. */
+#ifdef PNG_FLOATING_ARITHMETIC_SUPPORTED
+   double r = 1E15/a;
+   r /= b;
+   r = floor(r+.5);
+
+   if (r <= 2147483647. && r >= -2147483648.)
+      return (png_fixed_point)r;
+#else
+   /* This may overflow because the range of png_fixed_point isn't symmetric,
+    * but this API is only used for the product of file and screen gamma so it
+    * doesn't matter that the smallest number it can produce is 1/21474, not
+    * 1/100000
+    */
+   png_fixed_point res = png_product2(a, b);
+
+   if (res != 0)
+      return png_reciprocal(res);
+#endif
+
+   return 0; /* overflow */
+}
+#endif /* READ_GAMMA */
+
+#ifdef PNG_CHECK_cHRM_SUPPORTED
+/* Added at libpng version 1.2.34 (Dec 8, 2008) and 1.4.0 (Jan 2,
+ * 2010: moved from pngset.c) */
+/*
+ *    Multiply two 32-bit numbers, V1 and V2, using 32-bit
+ *    arithmetic, to produce a 64-bit result in the HI/LO words.
+ *
+ *                  A B
+ *                x C D
+ *               ------
+ *              AD || BD
+ *        AC || CB || 0
+ *
+ *    where A and B are the high and low 16-bit words of V1,
+ *    C and D are the 16-bit words of V2, AD is the product of
+ *    A and D, and X || Y is (X << 16) + Y.
+*/
+
+void /* PRIVATE */
+png_64bit_product (long v1, long v2, unsigned long *hi_product,
+    unsigned long *lo_product)
+{
+   int a, b, c, d;
+   long lo, hi, x, y;
+
+   a = (v1 >> 16) & 0xffff;
+   b = v1 & 0xffff;
+   c = (v2 >> 16) & 0xffff;
+   d = v2 & 0xffff;
+
+   lo = b * d;                   /* BD */
+   x = a * d + c * b;            /* AD + CB */
+   y = ((lo >> 16) & 0xffff) + x;
+
+   lo = (lo & 0xffff) | ((y & 0xffff) << 16);
+   hi = (y >> 16) & 0xffff;
+
+   hi += a * c;                  /* AC */
+
+   *hi_product = (unsigned long)hi;
+   *lo_product = (unsigned long)lo;
+}
+#endif /* CHECK_cHRM */
+
+#ifdef PNG_READ_GAMMA_SUPPORTED /* gamma table code */
+#ifndef PNG_FLOATING_ARITHMETIC_SUPPORTED
+/* Fixed point gamma.
+ *
+ * To calculate gamma this code implements fast log() and exp() calls using only
+ * fixed point arithmetic.  This code has sufficient precision for either 8-bit
+ * or 16-bit sample values.
+ *
+ * The tables used here were calculated using simple 'bc' programs, but C double
+ * precision floating point arithmetic would work fine.  The programs are given
+ * at the head of each table.
+ *
+ * 8-bit log table
+ *   This is a table of -log(value/255)/log(2) for 'value' in the range 128 to
+ *   255, so it's the base 2 logarithm of a normalized 8-bit floating point
+ *   mantissa.  The numbers are 32-bit fractions.
+ */
+static png_uint_32
+png_8bit_l2[128] =
+{
+#  if PNG_DO_BC
+      for (i=128;i<256;++i) { .5 - l(i/255)/l(2)*65536*65536; }
+#  endif
+   4270715492U, 4222494797U, 4174646467U, 4127164793U, 4080044201U, 4033279239U,
+   3986864580U, 3940795015U, 3895065449U, 3849670902U, 3804606499U, 3759867474U,
+   3715449162U, 3671346997U, 3627556511U, 3584073329U, 3540893168U, 3498011834U,
+   3455425220U, 3413129301U, 3371120137U, 3329393864U, 3287946700U, 3246774933U,
+   3205874930U, 3165243125U, 3124876025U, 3084770202U, 3044922296U, 3005329011U,
+   2965987113U, 2926893432U, 2888044853U, 2849438323U, 2811070844U, 2772939474U,
+   2735041326U, 2697373562U, 2659933400U, 2622718104U, 2585724991U, 2548951424U,
+   2512394810U, 2476052606U, 2439922311U, 2404001468U, 2368287663U, 2332778523U,
+   2297471715U, 2262364947U, 2227455964U, 2192742551U, 2158222529U, 2123893754U,
+   2089754119U, 2055801552U, 2022034013U, 1988449497U, 1955046031U, 1921821672U,
+   1888774511U, 1855902668U, 1823204291U, 1790677560U, 1758320682U, 1726131893U,
+   1694109454U, 1662251657U, 1630556815U, 1599023271U, 1567649391U, 1536433567U,
+   1505374214U, 1474469770U, 1443718700U, 1413119487U, 1382670639U, 1352370686U,
+   1322218179U, 1292211689U, 1262349810U, 1232631153U, 1203054352U, 1173618059U,
+   1144320946U, 1115161701U, 1086139034U, 1057251672U, 1028498358U, 999877854U,
+   971388940U, 943030410U, 914801076U, 886699767U, 858725327U, 830876614U,
+   803152505U, 775551890U, 748073672U, 720716771U, 693480120U, 666362667U,
+   639363374U, 612481215U, 585715177U, 559064263U, 532527486U, 506103872U,
+   479792461U, 453592303U, 427502463U, 401522014U, 375650043U, 349885648U,
+   324227938U, 298676034U, 273229066U, 247886176U, 222646516U, 197509248U,
+   172473545U, 147538590U, 122703574U, 97967701U, 73330182U, 48790236U,
+   24347096U, 0U
+#if 0
+   /* The following are the values for 16-bit tables - these work fine for the
+    * 8-bit conversions but produce very slightly larger errors in the 16-bit
+    * log (about 1.2 as opposed to 0.7 absolute error in the final value).  To
+    * use these all the shifts below must be adjusted appropriately.
+    */
+   65166, 64430, 63700, 62976, 62257, 61543, 60835, 60132, 59434, 58741, 58054,
+   57371, 56693, 56020, 55352, 54689, 54030, 53375, 52726, 52080, 51439, 50803,
+   50170, 49542, 48918, 48298, 47682, 47070, 46462, 45858, 45257, 44661, 44068,
+   43479, 42894, 42312, 41733, 41159, 40587, 40020, 39455, 38894, 38336, 37782,
+   37230, 36682, 36137, 35595, 35057, 34521, 33988, 33459, 32932, 32408, 31887,
+   31369, 30854, 30341, 29832, 29325, 28820, 28319, 27820, 27324, 26830, 26339,
+   25850, 25364, 24880, 24399, 23920, 23444, 22970, 22499, 22029, 21562, 21098,
+   20636, 20175, 19718, 19262, 18808, 18357, 17908, 17461, 17016, 16573, 16132,
+   15694, 15257, 14822, 14390, 13959, 13530, 13103, 12678, 12255, 11834, 11415,
+   10997, 10582, 10168, 9756, 9346, 8937, 8531, 8126, 7723, 7321, 6921, 6523,
+   6127, 5732, 5339, 4947, 4557, 4169, 3782, 3397, 3014, 2632, 2251, 1872, 1495,
+   1119, 744, 372
+#endif
+};
+
+PNG_STATIC png_int_32
+png_log8bit(unsigned int x)
+{
+   unsigned int lg2 = 0;
+   /* Each time 'x' is multiplied by 2, 1 must be subtracted off the final log,
+    * because the log is actually negate that means adding 1.  The final
+    * returned value thus has the range 0 (for 255 input) to 7.994 (for 1
+    * input), return 7.99998 for the overflow (log 0) case - so the result is
+    * always at most 19 bits.
+    */
+   if ((x &= 0xff) == 0)
+      return 0xffffffff;
+
+   if ((x & 0xf0) == 0)
+      lg2  = 4, x <<= 4;
+
+   if ((x & 0xc0) == 0)
+      lg2 += 2, x <<= 2;
+
+   if ((x & 0x80) == 0)
+      lg2 += 1, x <<= 1;
+
+   /* result is at most 19 bits, so this cast is safe: */
+   return (png_int_32)((lg2 << 16) + ((png_8bit_l2[x-128]+32768)>>16));
+}
+
+/* The above gives exact (to 16 binary places) log2 values for 8-bit images,
+ * for 16-bit images we use the most significant 8 bits of the 16-bit value to
+ * get an approximation then multiply the approximation by a correction factor
+ * determined by the remaining up to 8 bits.  This requires an additional step
+ * in the 16-bit case.
+ *
+ * We want log2(value/65535), we have log2(v'/255), where:
+ *
+ *    value = v' * 256 + v''
+ *          = v' * f
+ *
+ * So f is value/v', which is equal to (256+v''/v') since v' is in the range 128
+ * to 255 and v'' is in the range 0 to 255 f will be in the range 256 to less
+ * than 258.  The final factor also needs to correct for the fact that our 8-bit
+ * value is scaled by 255, whereas the 16-bit values must be scaled by 65535.
+ *
+ * This gives a final formula using a calculated value 'x' which is value/v' and
+ * scaling by 65536 to match the above table:
+ *
+ *   log2(x/257) * 65536
+ *
+ * Since these numbers are so close to '1' we can use simple linear
+ * interpolation between the two end values 256/257 (result -368.61) and 258/257
+ * (result 367.179).  The values used below are scaled by a further 64 to give
+ * 16-bit precision in the interpolation:
+ *
+ * Start (256): -23591
+ * Zero  (257):      0
+ * End   (258):  23499
+ */
+PNG_STATIC png_int_32
+png_log16bit(png_uint_32 x)
+{
+   unsigned int lg2 = 0;
+
+   /* As above, but now the input has 16 bits. */
+   if ((x &= 0xffff) == 0)
+      return 0xffffffff;
+
+   if ((x & 0xff00) == 0)
+      lg2  = 8, x <<= 8;
+
+   if ((x & 0xf000) == 0)
+      lg2 += 4, x <<= 4;
+
+   if ((x & 0xc000) == 0)
+      lg2 += 2, x <<= 2;
+
+   if ((x & 0x8000) == 0)
+      lg2 += 1, x <<= 1;
+
+   /* Calculate the base logarithm from the top 8 bits as a 28-bit fractional
+    * value.
+    */
+   lg2 <<= 28;
+   lg2 += (png_8bit_l2[(x>>8)-128]+8) >> 4;
+
+   /* Now we need to interpolate the factor, this requires a division by the top
+    * 8 bits.  Do this with maximum precision.
+    */
+   x = ((x << 16) + (x >> 9)) / (x >> 8);
+
+   /* Since we divided by the top 8 bits of 'x' there will be a '1' at 1<<24,
+    * the value at 1<<16 (ignoring this) will be 0 or 1; this gives us exactly
+    * 16 bits to interpolate to get the low bits of the result.  Round the
+    * answer.  Note that the end point values are scaled by 64 to retain overall
+    * precision and that 'lg2' is current scaled by an extra 12 bits, so adjust
+    * the overall scaling by 6-12.  Round at every step.
+    */
+   x -= 1U << 24;
+
+   if (x <= 65536U) /* <= '257' */
+      lg2 += ((23591U * (65536U-x)) + (1U << (16+6-12-1))) >> (16+6-12);
+
+   else
+      lg2 -= ((23499U * (x-65536U)) + (1U << (16+6-12-1))) >> (16+6-12);
+
+   /* Safe, because the result can't have more than 20 bits: */
+   return (png_int_32)((lg2 + 2048) >> 12);
+}
+
+/* The 'exp()' case must invert the above, taking a 20-bit fixed point
+ * logarithmic value and returning a 16 or 8-bit number as appropriate.  In
+ * each case only the low 16 bits are relevant - the fraction - since the
+ * integer bits (the top 4) simply determine a shift.
+ *
+ * The worst case is the 16-bit distinction between 65535 and 65534, this
+ * requires perhaps spurious accuracty in the decoding of the logarithm to
+ * distinguish log2(65535/65534.5) - 10^-5 or 17 bits.  There is little chance
+ * of getting this accuracy in practice.
+ *
+ * To deal with this the following exp() function works out the exponent of the
+ * frational part of the logarithm by using an accurate 32-bit value from the
+ * top four fractional bits then multiplying in the remaining bits.
+ */
+static png_uint_32
+png_32bit_exp[16] =
+{
+#  if PNG_DO_BC
+      for (i=0;i<16;++i) { .5 + e(-i/16*l(2))*2^32; }
+#  endif
+   /* NOTE: the first entry is deliberately set to the maximum 32-bit value. */
+   4294967295U, 4112874773U, 3938502376U, 3771522796U, 3611622603U, 3458501653U,
+   3311872529U, 3171459999U, 3037000500U, 2908241642U, 2784941738U, 2666869345U,
+   2553802834U, 2445529972U, 2341847524U, 2242560872U
+};
+
+/* Adjustment table; provided to explain the numbers in the code below. */
+#if PNG_DO_BC
+for (i=11;i>=0;--i){ print i, " ", (1 - e(-(2^i)/65536*l(2))) * 2^(32-i), "\n"}
+   11 44937.64284865548751208448
+   10 45180.98734845585101160448
+    9 45303.31936980687359311872
+    8 45364.65110595323018870784
+    7 45395.35850361789624614912
+    6 45410.72259715102037508096
+    5 45418.40724413220722311168
+    4 45422.25021786898173001728
+    3 45424.17186732298419044352
+    2 45425.13273269940811464704
+    1 45425.61317555035558641664
+    0 45425.85339951654943850496
+#endif
+
+PNG_STATIC png_uint_32
+png_exp(png_fixed_point x)
+{
+   if (x > 0 && x <= 0xfffff) /* Else overflow or zero (underflow) */
+   {
+      /* Obtain a 4-bit approximation */
+      png_uint_32 e = png_32bit_exp[(x >> 12) & 0xf];
+
+      /* Incorporate the low 12 bits - these decrease the returned value by
+       * multiplying by a number less than 1 if the bit is set.  The multiplier
+       * is determined by the above table and the shift. Notice that the values
+       * converge on 45426 and this is used to allow linear interpolation of the
+       * low bits.
+       */
+      if (x & 0x800)
+         e -= (((e >> 16) * 44938U) +  16U) >> 5;
+
+      if (x & 0x400)
+         e -= (((e >> 16) * 45181U) +  32U) >> 6;
+
+      if (x & 0x200)
+         e -= (((e >> 16) * 45303U) +  64U) >> 7;
+
+      if (x & 0x100)
+         e -= (((e >> 16) * 45365U) + 128U) >> 8;
+
+      if (x & 0x080)
+         e -= (((e >> 16) * 45395U) + 256U) >> 9;
+
+      if (x & 0x040)
+         e -= (((e >> 16) * 45410U) + 512U) >> 10;
+
+      /* And handle the low 6 bits in a single block. */
+      e -= (((e >> 16) * 355U * (x & 0x3fU)) + 256U) >> 9;
+
+      /* Handle the upper bits of x. */
+      e >>= x >> 16;
+      return e;
+   }
+
+   /* Check for overflow */
+   if (x <= 0)
+      return png_32bit_exp[0];
+
+   /* Else underflow */
+   return 0;
+}
+
+PNG_STATIC png_byte
+png_exp8bit(png_fixed_point lg2)
+{
+   /* Get a 32-bit value: */
+   png_uint_32 x = png_exp(lg2);
+
+   /* Convert the 32-bit value to 0..255 by multiplying by 256-1, note that the
+    * second, rounding, step can't overflow because of the first, subtraction,
+    * step.
+    */
+   x -= x >> 8;
+   return (png_byte)((x + 0x7fffffU) >> 24);
+}
+
+PNG_STATIC png_uint_16
+png_exp16bit(png_fixed_point lg2)
+{
+   /* Get a 32-bit value: */
+   png_uint_32 x = png_exp(lg2);
+
+   /* Convert the 32-bit value to 0..65535 by multiplying by 65536-1: */
+   x -= x >> 16;
+   return (png_uint_16)((x + 32767U) >> 16);
+}
+#endif /* FLOATING_ARITHMETIC */
+
+png_byte
+png_gamma_8bit_correct(unsigned int value, png_fixed_point gamma_val)
+{
+   if (value > 0 && value < 255)
+   {
+#     ifdef PNG_FLOATING_ARITHMETIC_SUPPORTED
+         double r = floor(255*pow(value/255.,gamma_val*.00001)+.5);
+         return (png_byte)r;
+#     else
+         png_int_32 lg2 = png_log8bit(value);
+         png_fixed_point res;
+
+         if (png_muldiv(&res, gamma_val, lg2, PNG_FP_1))
+            return png_exp8bit(res);
+
+         /* Overflow. */
+         value = 0;
+#     endif
+   }
+
+   return (png_byte)value;
+}
+
+png_uint_16
+png_gamma_16bit_correct(unsigned int value, png_fixed_point gamma_val)
+{
+   if (value > 0 && value < 65535)
+   {
+#     ifdef PNG_FLOATING_ARITHMETIC_SUPPORTED
+         double r = floor(65535*pow(value/65535.,gamma_val*.00001)+.5);
+         return (png_uint_16)r;
+#     else
+         png_int_32 lg2 = png_log16bit(value);
+         png_fixed_point res;
+
+         if (png_muldiv(&res, gamma_val, lg2, PNG_FP_1))
+            return png_exp16bit(res);
+
+         /* Overflow. */
+         value = 0;
+#     endif
+   }
+
+   return (png_uint_16)value;
+}
+
+/* This does the right thing based on the bit_depth field of the
+ * png_struct, interpreting values as 8-bit or 16-bit.  While the result
+ * is nominally a 16-bit value if bit depth is 8 then the result is
+ * 8-bit (as are the arguments.)
+ */
+png_uint_16 /* PRIVATE */
+png_gamma_correct(png_structp png_ptr, unsigned int value,
+    png_fixed_point gamma_val)
+{
+   if (png_ptr->bit_depth == 8)
+      return png_gamma_8bit_correct(value, gamma_val);
+
+   else
+      return png_gamma_16bit_correct(value, gamma_val);
+}
+
+/* This is the shared test on whether a gamma value is 'significant' - whether
+ * it is worth doing gamma correction.
+ */
+int /* PRIVATE */
+png_gamma_significant(png_fixed_point gamma_val)
+{
+   return gamma_val < PNG_FP_1 - PNG_GAMMA_THRESHOLD_FIXED ||
+       gamma_val > PNG_FP_1 + PNG_GAMMA_THRESHOLD_FIXED;
+}
+
+/* Internal function to build a single 16-bit table - the table consists of
+ * 'num' 256 entry subtables, where 'num' is determined by 'shift' - the amount
+ * to shift the input values right (or 16-number_of_signifiant_bits).
+ *
+ * The caller is responsible for ensuring that the table gets cleaned up on
+ * png_error (i.e. if one of the mallocs below fails) - i.e. the *table argument
+ * should be somewhere that will be cleaned.
+ */
+static void
+png_build_16bit_table(png_structp png_ptr, png_uint_16pp *ptable,
+   PNG_CONST unsigned int shift, PNG_CONST png_fixed_point gamma_val)
+{
+   /* Various values derived from 'shift': */
+   PNG_CONST unsigned int num = 1U << (8U - shift);
+   PNG_CONST unsigned int max = (1U << (16U - shift))-1U;
+   PNG_CONST unsigned int max_by_2 = 1U << (15U-shift);
+   unsigned int i;
+
+   png_uint_16pp table = *ptable =
+       (png_uint_16pp)png_calloc(png_ptr, num * png_sizeof(png_uint_16p));
+
+   for (i = 0; i < num; i++)
+   {
+      png_uint_16p sub_table = table[i] =
+          (png_uint_16p)png_malloc(png_ptr, 256 * png_sizeof(png_uint_16));
+
+      /* The 'threshold' test is repeated here because it can arise for one of
+       * the 16-bit tables even if the others don't hit it.
+       */
+      if (png_gamma_significant(gamma_val))
+      {
+         /* The old code would overflow at the end and this would cause the
+          * 'pow' function to return a result >1, resulting in an
+          * arithmetic error.  This code follows the spec exactly; ig is
+          * the recovered input sample, it always has 8-16 bits.
+          *
+          * We want input * 65535/max, rounded, the arithmetic fits in 32
+          * bits (unsigned) so long as max <= 32767.
+          */
+         unsigned int j;
+         for (j = 0; j < 256; j++)
+         {
+            png_uint_32 ig = (j << (8-shift)) + i;
+#           ifdef PNG_FLOATING_ARITHMETIC_SUPPORTED
+               /* Inline the 'max' scaling operation: */
+               double d = floor(65535*pow(ig/(double)max, gamma_val*.00001)+.5);
+               sub_table[j] = (png_uint_16)d;
+#           else
+               if (shift)
+                  ig = (ig * 65535U + max_by_2)/max;
+
+               sub_table[j] = png_gamma_16bit_correct(ig, gamma_val);
+#           endif
+         }
+      }
+      else
+      {
+         /* We must still build a table, but do it the fast way. */
+         unsigned int j;
+
+         for (j = 0; j < 256; j++)
+         {
+            png_uint_32 ig = (j << (8-shift)) + i;
+
+            if (shift)
+               ig = (ig * 65535U + max_by_2)/max;
+
+            sub_table[j] = (png_uint_16)ig;
+         }
+      }
+   }
+}
+
+/* NOTE: this function expects the *inverse* of the overall gamma transformation
+ * required.
+ */
+static void
+png_build_16to8_table(png_structp png_ptr, png_uint_16pp *ptable,
+   PNG_CONST unsigned int shift, PNG_CONST png_fixed_point gamma_val)
+{
+   PNG_CONST unsigned int num = 1U << (8U - shift);
+   PNG_CONST unsigned int max = (1U << (16U - shift))-1U;
+   unsigned int i;
+   png_uint_32 last;
+
+   png_uint_16pp table = *ptable =
+       (png_uint_16pp)png_calloc(png_ptr, num * png_sizeof(png_uint_16p));
+
+   /* 'num' is the number of tables and also the number of low bits of low
+    * bits of the input 16-bit value used to select a table.  Each table is
+    * itself index by the high 8 bits of the value.
+    */
+   for (i = 0; i < num; i++)
+      table[i] = (png_uint_16p)png_malloc(png_ptr,
+          256 * png_sizeof(png_uint_16));
+
+   /* 'gamma_val' is set to the reciprocal of the value calculated above, so
+    * pow(out,g) is an *input* value.  'last' is the last input value set.
+    *
+    * In the loop 'i' is used to find output values.  Since the output is
+    * 8-bit there are only 256 possible values.  The tables are set up to
+    * select the closest possible output value for each input by finding
+    * the input value at the boundary between each pair of output values
+    * and filling the table up to that boundary with the lower output
+    * value.
+    *
+    * The boundary values are 0.5,1.5..253.5,254.5.  Since these are 9-bit
+    * values the code below uses a 16-bit value in i; the values start at
+    * 128.5 (for 0.5) and step by 257, for a total of 254 values (the last
+    * entries are filled with 255).  Start i at 128 and fill all 'last'
+    * table entries <= 'max'
+    */
+   last = 0;
+   for (i = 0; i < 255; ++i) /* 8-bit output value */
+   {
+      /* Find the corresponding maximum input value */
+      png_uint_16 out = (png_uint_16)(i * 257U); /* 16-bit output value */
+
+      /* Find the boundary value in 16 bits: */
+      png_uint_32 bound = png_gamma_16bit_correct(out+128U, gamma_val);
+
+      /* Adjust (round) to (16-shift) bits: */
+      bound = (bound * max + 32768U)/65535U + 1U;
+
+      while (last < bound)
+      {
+         table[last & (0xffU >> shift)][last >> (8U - shift)] = out;
+         last++;
+      }
+   }
+
+   /* And fill in the final entries. */
+   while (last < (num << 8))
+   {
+      table[last & (0xff >> shift)][last >> (8U - shift)] = 65535U;
+      last++;
+   }
+}
+
+/* Build a single 8-bit table: same as the 16-bit case but much simpler (and
+ * typically much faster).  Note that libpng currently does no sBIT processing
+ * (apparently contrary to the spec) so a 256 entry table is always generated.
+ */
+static void
+png_build_8bit_table(png_structp png_ptr, png_bytepp ptable,
+   PNG_CONST png_fixed_point gamma_val)
+{
+   unsigned int i;
+   png_bytep table = *ptable = (png_bytep)png_malloc(png_ptr, 256);
+
+   if (png_gamma_significant(gamma_val)) for (i=0; i<256; i++)
+      table[i] = png_gamma_8bit_correct(i, gamma_val);
+
+   else for (i=0; i<256; ++i)
+      table[i] = (png_byte)i;
+}
+
+/* We build the 8- or 16-bit gamma tables here.  Note that for 16-bit
+ * tables, we don't make a full table if we are reducing to 8-bit in
+ * the future.  Note also how the gamma_16 tables are segmented so that
+ * we don't need to allocate > 64K chunks for a full 16-bit table.
+ */
+void /* PRIVATE */
+png_build_gamma_table(png_structp png_ptr, int bit_depth)
+{
+  png_debug(1, "in png_build_gamma_table");
+
+  if (bit_depth <= 8)
+  {
+     png_build_8bit_table(png_ptr, &png_ptr->gamma_table,
+         png_ptr->screen_gamma > 0 ?  png_reciprocal2(png_ptr->gamma,
+         png_ptr->screen_gamma) : PNG_FP_1);
+
+#if defined(PNG_READ_BACKGROUND_SUPPORTED) || \
+   defined(PNG_READ_ALPHA_MODE_SUPPORTED) || \
+   defined(PNG_READ_RGB_TO_GRAY_SUPPORTED)
+     if (png_ptr->transformations & (PNG_COMPOSE | PNG_RGB_TO_GRAY))
+     {
+        png_build_8bit_table(png_ptr, &png_ptr->gamma_to_1,
+            png_reciprocal(png_ptr->gamma));
+
+        png_build_8bit_table(png_ptr, &png_ptr->gamma_from_1,
+            png_ptr->screen_gamma > 0 ?  png_reciprocal(png_ptr->screen_gamma) :
+            png_ptr->gamma/* Probably doing rgb_to_gray */);
+     }
+#endif /* READ_BACKGROUND || READ_ALPHA_MODE || RGB_TO_GRAY */
+  }
+  else
+  {
+     png_byte shift, sig_bit;
+
+     if (png_ptr->color_type & PNG_COLOR_MASK_COLOR)
+     {
+        sig_bit = png_ptr->sig_bit.red;
+
+        if (png_ptr->sig_bit.green > sig_bit)
+           sig_bit = png_ptr->sig_bit.green;
+
+        if (png_ptr->sig_bit.blue > sig_bit)
+           sig_bit = png_ptr->sig_bit.blue;
+     }
+     else
+        sig_bit = png_ptr->sig_bit.gray;
+
+     /* 16-bit gamma code uses this equation:
+      *
+      *   ov = table[(iv & 0xff) >> gamma_shift][iv >> 8]
+      *
+      * Where 'iv' is the input color value and 'ov' is the output value -
+      * pow(iv, gamma).
+      *
+      * Thus the gamma table consists of up to 256 256 entry tables.  The table
+      * is selected by the (8-gamma_shift) most significant of the low 8 bits of
+      * the color value then indexed by the upper 8 bits:
+      *
+      *   table[low bits][high 8 bits]
+      *
+      * So the table 'n' corresponds to all those 'iv' of:
+      *
+      *   <all high 8-bit values><n << gamma_shift>..<(n+1 << gamma_shift)-1>
+      *
+      */
+     if (sig_bit > 0 && sig_bit < 16U)
+        shift = (png_byte)(16U - sig_bit); /* shift == insignificant bits */
+
+     else
+        shift = 0; /* keep all 16 bits */
+
+     if (png_ptr->transformations & (PNG_16_TO_8 | PNG_SCALE_16_TO_8))
+     {
+        /* PNG_MAX_GAMMA_8 is the number of bits to keep - effectively
+         * the significant bits in the *input* when the output will
+         * eventually be 8 bits.  By default it is 11.
+         */
+        if (shift < (16U - PNG_MAX_GAMMA_8))
+           shift = (16U - PNG_MAX_GAMMA_8);
+     }
+
+     if (shift > 8U)
+        shift = 8U; /* Guarantees at least one table! */
+
+     png_ptr->gamma_shift = shift;
+
+#ifdef PNG_16BIT_SUPPORTED
+     /* NOTE: prior to 1.5.4 this test used to include PNG_BACKGROUND (now
+      * PNG_COMPOSE).  This effectively smashed the background calculation for
+      * 16-bit output because the 8-bit table assumes the result will be reduced
+      * to 8 bits.
+      */
+     if (png_ptr->transformations & (PNG_16_TO_8 | PNG_SCALE_16_TO_8))
+#endif
+         png_build_16to8_table(png_ptr, &png_ptr->gamma_16_table, shift,
+         png_ptr->screen_gamma > 0 ? png_product2(png_ptr->gamma,
+         png_ptr->screen_gamma) : PNG_FP_1);
+
+#ifdef PNG_16BIT_SUPPORTED
+     else
+         png_build_16bit_table(png_ptr, &png_ptr->gamma_16_table, shift,
+         png_ptr->screen_gamma > 0 ? png_reciprocal2(png_ptr->gamma,
+         png_ptr->screen_gamma) : PNG_FP_1);
+#endif
+
+#if defined(PNG_READ_BACKGROUND_SUPPORTED) || \
+   defined(PNG_READ_ALPHA_MODE_SUPPORTED) || \
+   defined(PNG_READ_RGB_TO_GRAY_SUPPORTED)
+     if (png_ptr->transformations & (PNG_COMPOSE | PNG_RGB_TO_GRAY))
+     {
+        png_build_16bit_table(png_ptr, &png_ptr->gamma_16_to_1, shift,
+            png_reciprocal(png_ptr->gamma));
+
+        /* Notice that the '16 from 1' table should be full precision, however
+         * the lookup on this table still uses gamma_shift, so it can't be.
+         * TODO: fix this.
+         */
+        png_build_16bit_table(png_ptr, &png_ptr->gamma_16_from_1, shift,
+            png_ptr->screen_gamma > 0 ? png_reciprocal(png_ptr->screen_gamma) :
+            png_ptr->gamma/* Probably doing rgb_to_gray */);
+     }
+#endif /* READ_BACKGROUND || READ_ALPHA_MODE || RGB_TO_GRAY */
+  }
+}
+#endif /* READ_GAMMA */
 #endif /* defined(PNG_READ_SUPPORTED) || defined(PNG_WRITE_SUPPORTED) */
--- a/jdk/src/share/native/sun/awt/libpng/png.h	Wed Jul 05 17:51:25 2017 +0200
+++ b/jdk/src/share/native/sun/awt/libpng/png.h	Mon Sep 26 14:29:34 2011 -0700
@@ -29,24 +29,26 @@
  * However, the following notice accompanied the original version of this
  * file and, per its terms, should not be removed:
  *
- * libpng version 1.2.18 - May 15, 2007
- * Copyright (c) 1998-2007 Glenn Randers-Pehrson
+ * libpng version 1.5.4 - July 7, 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.)
  *
+ * This code is released under the libpng license (See LICENSE, below)
+ *
  * 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 1.2.18 - May 15, 2007: Glenn
- *  See also "Contributing Authors", below.
+ *   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 1.5.4 - July 7, 2011: Glenn
+ *   See also "Contributing Authors", below.
  *
  * Note about libpng version numbers:
  *
- *    Due to various miscommunications, unforeseen code incompatibilities
- *    and occasional factors outside the authors' control, version numbering
- *    on the library has not always been consistent and straightforward.
- *    The following table summarizes matters since version 0.89c, which was
- *    the first widely used release:
+ *   Due to various miscommunications, unforeseen code incompatibilities
+ *   and occasional factors outside the authors' control, version numbering
+ *   on the library has not always been consistent and straightforward.
+ *   The following table summarizes matters since version 0.89c, which was
+ *   the first widely used release:
  *
  *    source                 png.h  png.h  shared-lib
  *    version                string   int  version
@@ -131,74 +133,79 @@
  *    1.0.16                  10    10016  10.so.0.1.0.16
  *    1.2.6                   13    10206  12.so.0.1.2.6
  *    1.2.7beta1-2            13    10207  12.so.0.1.2.7beta1-2
- *    1.0.17rc1               10    10017  10.so.0.1.0.17rc1
+ *    1.0.17rc1               10    10017  12.so.0.1.0.17rc1
  *    1.2.7rc1                13    10207  12.so.0.1.2.7rc1
- *    1.0.17                  10    10017  10.so.0.1.0.17
+ *    1.0.17                  10    10017  12.so.0.1.0.17
  *    1.2.7                   13    10207  12.so.0.1.2.7
  *    1.2.8beta1-5            13    10208  12.so.0.1.2.8beta1-5
- *    1.0.18rc1-5             10    10018  10.so.0.1.0.18rc1-5
+ *    1.0.18rc1-5             10    10018  12.so.0.1.0.18rc1-5
  *    1.2.8rc1-5              13    10208  12.so.0.1.2.8rc1-5
- *    1.0.18                  10    10018  10.so.0.1.0.18
+ *    1.0.18                  10    10018  12.so.0.1.0.18
  *    1.2.8                   13    10208  12.so.0.1.2.8
  *    1.2.9beta1-3            13    10209  12.so.0.1.2.9beta1-3
  *    1.2.9beta4-11           13    10209  12.so.0.9[.0]
  *    1.2.9rc1                13    10209  12.so.0.9[.0]
  *    1.2.9                   13    10209  12.so.0.9[.0]
- *    1.2.10beta1-8           13    10210  12.so.0.10[.0]
- *    1.2.10rc1-3             13    10210  12.so.0.10[.0]
+ *    1.2.10beta1-7           13    10210  12.so.0.10[.0]
+ *    1.2.10rc1-2             13    10210  12.so.0.10[.0]
  *    1.2.10                  13    10210  12.so.0.10[.0]
+ *    1.4.0beta1-5            14    10400  14.so.0.0[.0]
  *    1.2.11beta1-4           13    10211  12.so.0.11[.0]
- *    1.0.19rc1-5             10    10019  10.so.0.19[.0]
- *    1.2.11rc1-5             13    10211  12.so.0.11[.0]
- *    1.0.19                  10    10019  10.so.0.19[.0]
+ *    1.4.0beta7-8            14    10400  14.so.0.0[.0]
  *    1.2.11                  13    10211  12.so.0.11[.0]
- *    1.0.20                  10    10020  10.so.0.20[.0]
  *    1.2.12                  13    10212  12.so.0.12[.0]
- *    1.2.13beta1             13    10213  12.so.0.13[.0]
- *    1.0.21                  10    10021  10.so.0.21[.0]
+ *    1.4.0beta9-14           14    10400  14.so.0.0[.0]
  *    1.2.13                  13    10213  12.so.0.13[.0]
- *    1.2.14beta1-2           13    10214  12.so.0.14[.0]
- *    1.0.22rc1               10    10022  10.so.0.22[.0]
- *    1.2.14rc1               13    10214  12.so.0.14[.0]
- *    1.0.22                  10    10022  10.so.0.22[.0]
- *    1.2.14                  13    10214  12.so.0.14[.0]
- *    1.2.15beta1-6           13    10215  12.so.0.15[.0]
- *    1.0.23rc1-5             10    10023  10.so.0.23[.0]
- *    1.2.15rc1-5             13    10215  12.so.0.15[.0]
- *    1.0.23                  10    10023  10.so.0.23[.0]
- *    1.2.15                  13    10215  12.so.0.15[.0]
- *    1.2.16beta1-2           13    10216  12.so.0.16[.0]
- *    1.2.16rc1               13    10216  12.so.0.16[.0]
- *    1.0.24                  10    10024  10.so.0.24[.0]
- *    1.2.16                  13    10216  12.so.0.16[.0]
- *    1.2.17beta1-2           13    10217  12.so.0.17[.0]
- *    1.0.25rc1               10    10025  10.so.0.25[.0]
- *    1.2.17rc1-3             13    10217  12.so.0.17[.0]
- *    1.0.25                  10    10025  10.so.0.25[.0]
- *    1.2.17                  13    10217  12.so.0.17[.0]
- *    1.0.26                  10    10026  10.so.0.26[.0]
- *    1.2.18                  13    10218  12.so.0.18[.0]
+ *    1.4.0beta15-36          14    10400  14.so.0.0[.0]
+ *    1.4.0beta37-87          14    10400  14.so.14.0[.0]
+ *    1.4.0rc01               14    10400  14.so.14.0[.0]
+ *    1.4.0beta88-109         14    10400  14.so.14.0[.0]
+ *    1.4.0rc02-08            14    10400  14.so.14.0[.0]
+ *    1.4.0                   14    10400  14.so.14.0[.0]
+ *    1.4.1beta01-03          14    10401  14.so.14.1[.0]
+ *    1.4.1rc01               14    10401  14.so.14.1[.0]
+ *    1.4.1beta04-12          14    10401  14.so.14.1[.0]
+ *    1.4.1                   14    10401  14.so.14.1[.0]
+ *    1.4.2                   14    10402  14.so.14.2[.0]
+ *    1.4.3                   14    10403  14.so.14.3[.0]
+ *    1.4.4                   14    10404  14.so.14.4[.0]
+ *    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]
+ *    1.5.1beta01-11          15    10501  15.so.15.1[.0]
+ *    1.5.1rc01-02            15    10501  15.so.15.1[.0]
+ *    1.5.1                   15    10501  15.so.15.1[.0]
+ *    1.5.2beta01-03          15    10502  15.so.15.2[.0]
+ *    1.5.2rc01-03            15    10502  15.so.15.2[.0]
+ *    1.5.2                   15    10502  15.so.15.2[.0]
+ *    1.5.3beta01-10          15    10503  15.so.15.3[.0]
+ *    1.5.3rc01-02            15    10503  15.so.15.3[.0]
+ *    1.5.3beta11             15    10503  15.so.15.3[.0]
+ *    1.5.3 [omitted]
+ *    1.5.4beta01-08          15    10504  15.so.15.4[.0]
+ *    1.5.4rc01               15    10504  15.so.15.4[.0]
+ *    1.5.4                   15    10504  15.so.15.4[.0]
  *
- *    Henceforth the source version will match the shared-library major
- *    and minor numbers; the shared-library major version number will be
- *    used for changes in backward compatibility, as it is intended.  The
- *    PNG_LIBPNG_VER macro, which is not used within libpng but is available
- *    for applications, is an unsigned integer of the form xyyzz corresponding
- *    to the source version x.y.z (leading zeros in y and z).  Beta versions
- *    were given the previous public release number plus a letter, until
- *    version 1.0.6j; from then on they were given the upcoming public
- *    release number plus "betaNN" or "rcN".
+ *   Henceforth the source version will match the shared-library major
+ *   and minor numbers; the shared-library major version number will be
+ *   used for changes in backward compatibility, as it is intended.  The
+ *   PNG_LIBPNG_VER macro, which is not used within libpng but is available
+ *   for applications, is an unsigned integer of the form xyyzz corresponding
+ *   to the source version x.y.z (leading zeros in y and z).  Beta versions
+ *   were given the previous public release number plus a letter, until
+ *   version 1.0.6j; from then on they were given the upcoming public
+ *   release number plus "betaNN" or "rcN".
  *
- *    Binary incompatibility exists only when applications make direct access
- *    to the info_ptr or png_ptr members through png.h, and the compiled
- *    application is loaded with a different version of the library.
+ *   Binary incompatibility exists only when applications make direct access
+ *   to the info_ptr or png_ptr members through png.h, and the compiled
+ *   application is loaded with a different version of the library.
  *
- *    DLLNUM will change each time there are forward or backward changes
- *    in binary compatibility (e.g., when a new feature is added).
+ *   DLLNUM will change each time there are forward or backward changes
+ *   in binary compatibility (e.g., when a new feature is added).
  *
- * See libpng.txt or libpng.3 for more information.  The PNG specification
- * is available as a W3C Recommendation and as an ISO Specification,
- * <http://www.w3.org/TR/2003/REC-PNG-20031110/
+ * See libpng-manual.txt or libpng.3 for more information.  The PNG
+ * specification is available as a W3C Recommendation and as an ISO
+ * Specification, <http://www.w3.org/TR/2003/REC-PNG-20031110/
  */
 
 /*
@@ -207,8 +214,10 @@
  * If you modify libpng you may insert additional notices immediately following
  * this sentence.
  *
- * libpng versions 1.2.6, August 15, 2004, through 1.2.18, May 15, 2007, are
- * Copyright (c) 2004, 2006-2007 Glenn Randers-Pehrson, and are
+ * This code is released under the libpng license.
+ *
+ * libpng versions 1.2.6, August 15, 2004, through 1.5.4, July 7, 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:
  *
@@ -277,13 +286,13 @@
  * source code, or portions hereof, for any purpose, without fee, subject
  * to the following restrictions:
  *
- * 1. The origin of this source code must not be misrepresented.
+ *   1. The origin of this source code must not be misrepresented.
  *
- * 2. Altered versions must be plainly marked as such and
- * must not be misrepresented as being the original source.
+ *   2. Altered versions must be plainly marked as such and must not
+ *      be misrepresented as being the original source.
  *
- * 3. This Copyright notice may not be removed or altered from
- *    any source or altered source distribution.
+ *   3. This Copyright notice may not be removed or altered from
+ *      any source or altered source distribution.
  *
  * The Contributing Authors and Group 42, Inc. specifically permit, without
  * fee, and encourage the use of this source code as a component to
@@ -296,7 +305,7 @@
  * A "png_get_copyright" function is available, for convenient use in "about"
  * boxes and the like:
  *
- * printf("%s",png_get_copyright(NULL));
+ *     printf("%s", png_get_copyright(NULL));
  *
  * Also, the PNG logo (in PNG format, of course) is supplied in the
  * files "pngbar.png" and "pngbar.jpg (88x31) and "pngnow.png" (98x31).
@@ -319,25 +328,24 @@
  * Y2K compliance in libpng:
  * =========================
  *
- *    May 15, 2007
+ *    July 7, 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 1.2.18 are Y2K compliant.  It is my belief that earlier
- *    versions were also Y2K compliant.
+ *    upward through 1.5.4 are Y2K compliant.  It is my belief that
+ *    earlier versions were also Y2K compliant.
  *
- *    Libpng only has three year fields.  One is a 2-byte unsigned integer
- *    that will hold years up to 65535.  The other two hold the date in text
+ *    Libpng only has two year fields.  One is a 2-byte unsigned integer
+ *    that will hold years up to 65535.  The other holds the date in text
  *    format, and will hold years up to 9999.
  *
  *    The integer is
  *        "png_uint_16 year" in png_time_struct.
  *
- *    The strings are
- *        "png_charp time_buffer" in png_struct and
- *        "near_time_buffer", which is a local character string in png.c.
+ *    The string is
+ *        "png_char time_buffer" in png_struct
  *
  *    There are seven time-related functions:
  *        png.c: png_convert_to_rfc_1123() in png.c
@@ -374,26 +382,27 @@
 #ifndef PNG_H
 #define PNG_H
 
-/* This is not the place to learn how to use libpng.  The file libpng.txt
+/* This is not the place to learn how to use libpng. The file libpng-manual.txt
  * describes how to use libpng, and the file example.c summarizes it
  * with some code on which to build.  This file is useful for looking
  * at the actual function definitions and structure components.
  */
 
 /* Version information for png.h - this should match the version in png.c */
-#define PNG_LIBPNG_VER_STRING "1.2.18"
+#define PNG_LIBPNG_VER_STRING "1.5.4"
 #define PNG_HEADER_VERSION_STRING \
-   " libpng version 1.2.18 - May 15, 2007 (header)\n"
+     " libpng version 1.5.4 - July 7, 2011\n"
 
-#define PNG_LIBPNG_VER_SONUM   0
-#define PNG_LIBPNG_VER_DLLNUM  13
+#define PNG_LIBPNG_VER_SONUM   15
+#define PNG_LIBPNG_VER_DLLNUM  15
 
 /* These should match the first 3 components of PNG_LIBPNG_VER_STRING: */
 #define PNG_LIBPNG_VER_MAJOR   1
-#define PNG_LIBPNG_VER_MINOR   2
-#define PNG_LIBPNG_VER_RELEASE 18
+#define PNG_LIBPNG_VER_MINOR   5
+#define PNG_LIBPNG_VER_RELEASE 4
 /* This should match the numeric part of the final component of
- * PNG_LIBPNG_VER_STRING, omitting any leading zero: */
+ * PNG_LIBPNG_VER_STRING, omitting any leading zero:
+ */
 
 #define PNG_LIBPNG_VER_BUILD  0
 
@@ -412,26 +421,53 @@
 #define PNG_LIBPNG_BUILD_SPECIAL 32 /* Cannot be OR'ed with
                                        PNG_LIBPNG_BUILD_PRIVATE */
 
-#define PNG_LIBPNG_BUILD_BASE_TYPE PNG_LIBPNG_BUILD_STABLE
+#define PNG_LIBPNG_BUILD_BASE_TYPE PNG_LIBPNG_BUILD_BETA
 
 /* Careful here.  At one time, Guy wanted to use 082, but that would be octal.
  * We must not include leading zeros.
  * Versions 0.7 through 1.0.0 were in the range 0 to 100 here (only
  * version 1.0.0 was mis-numbered 100 instead of 10000).  From
- * version 1.0.1 it's    xxyyzz, where x=major, y=minor, z=release */
-#define PNG_LIBPNG_VER 10218 /* 1.2.18 */
+ * version 1.0.1 it's    xxyyzz, where x=major, y=minor, z=release
+ */
+#define PNG_LIBPNG_VER 10504 /* 1.5.4 */
+
+/* Library configuration: these options cannot be changed after
+ * the library has been built.
+ */
+#ifndef PNGLCONF_H
+    /* If pnglibconf.h is missing, you can
+     * copy scripts/pnglibconf.h.prebuilt to pnglibconf.h
+     */
+#   include "pnglibconf.h"
+#endif
 
 #ifndef PNG_VERSION_INFO_ONLY
-/* include the compression library's header */
-#include "zlib.h"
+#  ifndef PNG_BUILDING_SYMBOL_TABLE
+  /*
+   *   Standard header files (not needed for the version info or while
+   *   building symbol table -- see scripts/pnglibconf.dfa)
+   */
+#    ifdef PNG_SETJMP_SUPPORTED
+#      include <setjmp.h>
+#    endif
+
+    /* Need the time information for converting tIME chunks, it
+     * defines struct tm:
+     */
+#    ifdef PNG_CONVERT_tIME_SUPPORTED
+       /* "time.h" functions are not supported on all operating systems */
+#      include <time.h>
+#    endif
+#  endif
+
+/* Machine specific configuration. */
+#  include "pngconf.h"
 #endif
 
-/* include all user configurable info, including optional assembler routines */
-#include "pngconf.h"
-
 /*
- * Added at libpng-1.2.8 */
-/* Ref MSDN: Private as priority over Special
+ * Added at libpng-1.2.8
+ *
+ * Ref MSDN: Private as priority over Special
  * VS_FF_PRIVATEBUILD File *was not* built using standard release
  * procedures. If this value is given, the StringFileInfo block must
  * contain a PrivateBuild string.
@@ -442,13 +478,13 @@
  * StringFileInfo block must contain a SpecialBuild string.
  */
 
-#if defined(PNG_USER_PRIVATEBUILD)
+#ifdef PNG_USER_PRIVATEBUILD /* From pnglibconf.h */
 #  define PNG_LIBPNG_BUILD_TYPE \
-          (PNG_LIBPNG_BUILD_BASE_TYPE | PNG_LIBPNG_BUILD_PRIVATE)
+       (PNG_LIBPNG_BUILD_BASE_TYPE | PNG_LIBPNG_BUILD_PRIVATE)
 #else
-#  if defined(PNG_LIBPNG_SPECIALBUILD)
+#  ifdef PNG_LIBPNG_SPECIALBUILD
 #    define PNG_LIBPNG_BUILD_TYPE \
-            (PNG_LIBPNG_BUILD_BASE_TYPE | PNG_LIBPNG_BUILD_SPECIAL)
+         (PNG_LIBPNG_BUILD_BASE_TYPE | PNG_LIBPNG_BUILD_SPECIAL)
 #  else
 #    define PNG_LIBPNG_BUILD_TYPE (PNG_LIBPNG_BUILD_BASE_TYPE)
 #  endif
@@ -461,76 +497,61 @@
 extern "C" {
 #endif /* __cplusplus */
 
-/* This file is arranged in several sections.  The first section contains
- * structure and type definitions.  The second section contains the external
- * library functions, while the third has the internal library functions,
- * which applications aren't expected to use directly.
- */
-
-#ifndef PNG_NO_TYPECAST_NULL
-#define int_p_NULL                (int *)NULL
-#define png_bytep_NULL            (png_bytep)NULL
-#define png_bytepp_NULL           (png_bytepp)NULL
-#define png_doublep_NULL          (png_doublep)NULL
-#define png_error_ptr_NULL        (png_error_ptr)NULL
-#define png_flush_ptr_NULL        (png_flush_ptr)NULL
-#define png_free_ptr_NULL         (png_free_ptr)NULL
-#define png_infopp_NULL           (png_infopp)NULL
-#define png_malloc_ptr_NULL       (png_malloc_ptr)NULL
-#define png_read_status_ptr_NULL  (png_read_status_ptr)NULL
-#define png_rw_ptr_NULL           (png_rw_ptr)NULL
-#define png_structp_NULL          (png_structp)NULL
-#define png_uint_16p_NULL         (png_uint_16p)NULL
-#define png_voidp_NULL            (png_voidp)NULL
-#define png_write_status_ptr_NULL (png_write_status_ptr)NULL
-#else
-#define int_p_NULL                NULL
-#define png_bytep_NULL            NULL
-#define png_bytepp_NULL           NULL
-#define png_doublep_NULL          NULL
-#define png_error_ptr_NULL        NULL
-#define png_flush_ptr_NULL        NULL
-#define png_free_ptr_NULL         NULL
-#define png_infopp_NULL           NULL
-#define png_malloc_ptr_NULL       NULL
-#define png_read_status_ptr_NULL  NULL
-#define png_rw_ptr_NULL           NULL
-#define png_structp_NULL          NULL
-#define png_uint_16p_NULL         NULL
-#define png_voidp_NULL            NULL
-#define png_write_status_ptr_NULL NULL
-#endif
-
-/* variables declared in png.c - only it needs to define PNG_NO_EXTERN */
-#if !defined(PNG_NO_EXTERN) || defined(PNG_ALWAYS_EXTERN)
 /* Version information for C files, stored in png.c.  This had better match
  * the version above.
  */
-#ifdef PNG_USE_GLOBAL_ARRAYS
-PNG_EXPORT_VAR (const char) png_libpng_ver[18];
-  /* need room for 99.99.99beta99z */
-#else
 #define png_libpng_ver png_get_header_ver(NULL)
-#endif
 
-#ifdef PNG_USE_GLOBAL_ARRAYS
-/* This was removed in version 1.0.5c */
-/* Structures to facilitate easy interlacing.  See png.c for more details */
-PNG_EXPORT_VAR (const int FARDATA) png_pass_start[7];
-PNG_EXPORT_VAR (const int FARDATA) png_pass_inc[7];
-PNG_EXPORT_VAR (const int FARDATA) png_pass_ystart[7];
-PNG_EXPORT_VAR (const int FARDATA) png_pass_yinc[7];
-PNG_EXPORT_VAR (const int FARDATA) png_pass_mask[7];
-PNG_EXPORT_VAR (const int FARDATA) png_pass_dsp_mask[7];
-#ifdef PNG_USE_PNGGCCRD
-PNG_EXPORT_VAR (const int FARDATA) png_pass_width[7];
-#endif
-/* This isn't currently used.  If you need it, see png.c for more details.
-PNG_EXPORT_VAR (const int FARDATA) png_pass_height[7];
-*/
-#endif
+/* This file is arranged in several sections:
+ *
+ * 1. Any configuration options that can be specified by for the application
+ *    code when it is built.  (Build time configuration is in pnglibconf.h)
+ * 2. Type definitions (base types are defined in pngconf.h), structure
+ *    definitions.
+ * 3. Exported library functions.
+ *
+ * The library source code has additional files (principally pngpriv.h) that
+ * allow configuration of the library.
+ */
+/* Section 1: run time configuration
+ * See pnglibconf.h for build time configuration
+ *
+ * Run time configuration allows the application to choose between
+ * implementations of certain arithmetic APIs.  The default is set
+ * at build time and recorded in pnglibconf.h, but it is safe to
+ * override these (and only these) settings.  Note that this won't
+ * change what the library does, only application code, and the
+ * settings can (and probably should) be made on a per-file basis
+ * by setting the #defines before including png.h
+ *
+ * Use macros to read integers from PNG data or use the exported
+ * functions?
+ *   PNG_USE_READ_MACROS: use the macros (see below)  Note that
+ *     the macros evaluate their argument multiple times.
+ *   PNG_NO_USE_READ_MACROS: call the relevant library function.
+ *
+ * Use the alternative algorithm for compositing alpha samples that
+ * does not use division?
+ *   PNG_READ_COMPOSITE_NODIV_SUPPORTED: use the 'no division'
+ *      algorithm.
+ *   PNG_NO_READ_COMPOSITE_NODIV: use the 'division' algorithm.
+ *
+ * How to handle benign errors if PNG_ALLOW_BENIGN_ERRORS is
+ * false?
+ *   PNG_ALLOW_BENIGN_ERRORS: map calls to the benign error
+ *      APIs to png_warning.
+ * Otherwise the calls are mapped to png_error.
+ */
 
-#endif /* PNG_NO_EXTERN */
+/* Section 2: type definitions, including structures and compile time
+ * constants.
+ * See pngconf.h for base types that vary by machine/system
+ */
+
+/* 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_4;
 
 /* 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
@@ -543,6 +564,7 @@
    png_byte blue;
 } png_color;
 typedef png_color FAR * png_colorp;
+typedef PNG_CONST png_color FAR * png_const_colorp;
 typedef png_color FAR * FAR * png_colorpp;
 
 typedef struct png_color_16_struct
@@ -554,6 +576,7 @@
    png_uint_16 gray;  /* for use in grayscale files */
 } png_color_16;
 typedef png_color_16 FAR * png_color_16p;
+typedef PNG_CONST png_color_16 FAR * png_const_color_16p;
 typedef png_color_16 FAR * FAR * png_color_16pp;
 
 typedef struct png_color_8_struct
@@ -565,6 +588,7 @@
    png_byte alpha; /* for alpha channel files */
 } png_color_8;
 typedef png_color_8 FAR * png_color_8p;
+typedef PNG_CONST png_color_8 FAR * png_const_color_8p;
 typedef png_color_8 FAR * FAR * png_color_8pp;
 
 /*
@@ -580,6 +604,7 @@
    png_uint_16 frequency;
 } png_sPLT_entry;
 typedef png_sPLT_entry FAR * png_sPLT_entryp;
+typedef PNG_CONST png_sPLT_entry FAR * png_const_sPLT_entryp;
 typedef png_sPLT_entry FAR * FAR * png_sPLT_entrypp;
 
 /*  When the depth of the sPLT palette is 8 bits, the color and alpha samples
@@ -595,6 +620,7 @@
    png_int_32 nentries;      /* number of palette entries */
 } png_sPLT_t;
 typedef png_sPLT_t FAR * png_sPLT_tp;
+typedef PNG_CONST png_sPLT_t FAR * png_const_sPLT_tp;
 typedef png_sPLT_t FAR * FAR * png_sPLT_tpp;
 
 #ifdef PNG_TEXT_SUPPORTED
@@ -602,7 +628,7 @@
  * and whether that contents is compressed or not.  The "key" field
  * points to a regular zero-terminated C string.  The "text", "lang", and
  * "lang_key" fields can be regular C strings, empty strings, or NULL pointers.
- * However, the * structure returned by png_get_text() will always contain
+ * However, the structure returned by png_get_text() will always contain
  * regular zero-terminated C strings (possibly empty), never NULL pointers,
  * so they can be safely used in printf() and other string-handling functions.
  */
@@ -617,15 +643,14 @@
    png_charp text;         /* comment, may be an empty string (ie "")
                               or a NULL pointer */
    png_size_t text_length; /* length of the text string */
-#ifdef PNG_iTXt_SUPPORTED
    png_size_t itxt_length; /* length of the itxt string */
    png_charp lang;         /* language code, 0-79 characters
                               or a NULL pointer */
    png_charp lang_key;     /* keyword translated UTF-8 string, 0 or more
                               chars or a NULL pointer */
-#endif
 } png_text;
 typedef png_text FAR * png_textp;
+typedef PNG_CONST png_text FAR * png_const_textp;
 typedef png_text FAR * FAR * png_textpp;
 #endif
 
@@ -655,9 +680,11 @@
    png_byte second;  /* second of minute, 0 - 60 (for leap seconds) */
 } png_time;
 typedef png_time FAR * png_timep;
+typedef PNG_CONST png_time FAR * png_const_timep;
 typedef png_time FAR * FAR * png_timepp;
 
-#if defined(PNG_UNKNOWN_CHUNKS_SUPPORTED)
+#if defined(PNG_UNKNOWN_CHUNKS_SUPPORTED) || \
+    defined(PNG_HANDLE_AS_UNKNOWN_SUPPORTED)
 /* png_unknown_chunk is a structure to hold queued chunks for which there is
  * no specific support.  The idea is that we can use this to queue
  * up private chunks for output even though the library doesn't actually
@@ -672,299 +699,41 @@
     /* libpng-using applications should NOT directly modify this byte. */
     png_byte location; /* mode of operation at read time */
 }
+
+
 png_unknown_chunk;
 typedef png_unknown_chunk FAR * png_unknown_chunkp;
+typedef PNG_CONST png_unknown_chunk FAR * png_const_unknown_chunkp;
 typedef png_unknown_chunk FAR * FAR * png_unknown_chunkpp;
 #endif
 
-/* png_info is a structure that holds the information in a PNG file so
- * that the application can find out the characteristics of the image.
- * If you are reading the file, this structure will tell you what is
- * in the PNG file.  If you are writing the file, fill in the information
- * you want to put into the PNG file, then call png_write_info().
- * The names chosen should be very close to the PNG specification, so
- * consult that document for information about the meaning of each field.
- *
- * With libpng < 0.95, it was only possible to directly set and read the
- * the values in the png_info_struct, which meant that the contents and
- * order of the values had to remain fixed.  With libpng 0.95 and later,
- * however, there are now functions that abstract the contents of
- * png_info_struct from the application, so this makes it easier to use
- * libpng with dynamic libraries, and even makes it possible to use
- * libraries that don't have all of the libpng ancillary chunk-handing
- * functionality.
- *
- * In any case, the order of the parameters in png_info_struct should NOT
- * be changed for as long as possible to keep compatibility with applications
- * that use the old direct-access method with png_info_struct.
- *
- * The following members may have allocated storage attached that should be
- * cleaned up before the structure is discarded: palette, trans, text,
- * pcal_purpose, pcal_units, pcal_params, hist, iccp_name, iccp_profile,
- * splt_palettes, scal_unit, row_pointers, and unknowns.   By default, these
- * are automatically freed when the info structure is deallocated, if they were
- * allocated internally by libpng.  This behavior can be changed by means
- * of the png_data_freer() function.
- *
- * More allocation details: all the chunk-reading functions that
- * change these members go through the corresponding png_set_*
- * functions.  A function to clear these members is available: see
- * png_free_data().  The png_set_* functions do not depend on being
- * able to point info structure members to any of the storage they are
- * passed (they make their own copies), EXCEPT that the png_set_text
- * functions use the same storage passed to them in the text_ptr or
- * itxt_ptr structure argument, and the png_set_rows and png_set_unknowns
- * functions do not make their own copies.
+/* Values for the unknown chunk location byte */
+
+#define PNG_HAVE_IHDR  0x01
+#define PNG_HAVE_PLTE  0x02
+#define PNG_AFTER_IDAT 0x08
+
+/* The complete definition of png_info has, as of libpng-1.5.0,
+ * been moved into a separate header file that is not accessible to
+ * applications.  Read libpng-manual.txt or libpng.3 for more info.
  */
-typedef struct png_info_struct
-{
-   /* the following are necessary for every PNG file */
-   png_uint_32 width;       /* width of image in pixels (from IHDR) */
-   png_uint_32 height;      /* height of image in pixels (from IHDR) */
-   png_uint_32 valid;       /* valid chunk data (see PNG_INFO_ below) */
-   png_uint_32 rowbytes;    /* bytes needed to hold an untransformed row */
-   png_colorp palette;      /* array of color values (valid & PNG_INFO_PLTE) */
-   png_uint_16 num_palette; /* number of color entries in "palette" (PLTE) */
-   png_uint_16 num_trans;   /* number of transparent palette color (tRNS) */
-   png_byte bit_depth;      /* 1, 2, 4, 8, or 16 bits/channel (from IHDR) */
-   png_byte color_type;     /* see PNG_COLOR_TYPE_ below (from IHDR) */
-   /* The following three should have been named *_method not *_type */
-   png_byte compression_type; /* must be PNG_COMPRESSION_TYPE_BASE (IHDR) */
-   png_byte filter_type;    /* must be PNG_FILTER_TYPE_BASE (from IHDR) */
-   png_byte interlace_type; /* One of PNG_INTERLACE_NONE, PNG_INTERLACE_ADAM7 */
-
-   /* The following is informational only on read, and not used on writes. */
-   png_byte channels;       /* number of data channels per pixel (1, 2, 3, 4) */
-   png_byte pixel_depth;    /* number of bits per pixel */
-   png_byte spare_byte;     /* to align the data, and for future use */
-   png_byte signature[8];   /* magic bytes read by libpng from start of file */
-
-   /* The rest of the data is optional.  If you are reading, check the
-    * valid field to see if the information in these are valid.  If you
-    * are writing, set the valid field to those chunks you want written,
-    * and initialize the appropriate fields below.
-    */
-
-#if defined(PNG_gAMA_SUPPORTED) && defined(PNG_FLOATING_POINT_SUPPORTED)
-   /* The gAMA chunk describes the gamma characteristics of the system
-    * on which the image was created, normally in the range [1.0, 2.5].
-    * Data is valid if (valid & PNG_INFO_gAMA) is non-zero.
-    */
-   float gamma; /* gamma value of image, if (valid & PNG_INFO_gAMA) */
-#endif
-
-#if defined(PNG_sRGB_SUPPORTED)
-    /* GR-P, 0.96a */
-    /* Data valid if (valid & PNG_INFO_sRGB) non-zero. */
-   png_byte srgb_intent; /* sRGB rendering intent [0, 1, 2, or 3] */
-#endif
-
-#if defined(PNG_TEXT_SUPPORTED)
-   /* The tEXt, and zTXt chunks contain human-readable textual data in
-    * uncompressed, compressed, and optionally compressed forms, respectively.
-    * The data in "text" is an array of pointers to uncompressed,
-    * null-terminated C strings. Each chunk has a keyword that describes the
-    * textual data contained in that chunk.  Keywords are not required to be
-    * unique, and the text string may be empty.  Any number of text chunks may
-    * be in an image.
-    */
-   int num_text; /* number of comments read/to write */
-   int max_text; /* current size of text array */
-   png_textp text; /* array of comments read/to write */
-#endif /* PNG_TEXT_SUPPORTED */
-
-#if defined(PNG_tIME_SUPPORTED)
-   /* The tIME chunk holds the last time the displayed image data was
-    * modified.  See the png_time struct for the contents of this struct.
-    */
-   png_time mod_time;
-#endif
-
-#if defined(PNG_sBIT_SUPPORTED)
-   /* The sBIT chunk specifies the number of significant high-order bits
-    * in the pixel data.  Values are in the range [1, bit_depth], and are
-    * only specified for the channels in the pixel data.  The contents of
-    * the low-order bits is not specified.  Data is valid if
-    * (valid & PNG_INFO_sBIT) is non-zero.
-    */
-   png_color_8 sig_bit; /* significant bits in color channels */
-#endif
-
-#if defined(PNG_tRNS_SUPPORTED) || defined(PNG_READ_EXPAND_SUPPORTED) || \
-defined(PNG_READ_BACKGROUND_SUPPORTED)
-   /* The tRNS chunk supplies transparency data for paletted images and
-    * other image types that don't need a full alpha channel.  There are
-    * "num_trans" transparency values for a paletted image, stored in the
-    * same order as the palette colors, starting from index 0.  Values
-    * for the data are in the range [0, 255], ranging from fully transparent
-    * to fully opaque, respectively.  For non-paletted images, there is a
-    * single color specified that should be treated as fully transparent.
-    * Data is valid if (valid & PNG_INFO_tRNS) is non-zero.
-    */
-   png_bytep trans; /* transparent values for paletted image */
-   png_color_16 trans_values; /* transparent color for non-palette image */
-#endif
-
-#if defined(PNG_bKGD_SUPPORTED) || defined(PNG_READ_BACKGROUND_SUPPORTED)
-   /* The bKGD chunk gives the suggested image background color if the
-    * display program does not have its own background color and the image
-    * is needs to composited onto a background before display.  The colors
-    * in "background" are normally in the same color space/depth as the
-    * pixel data.  Data is valid if (valid & PNG_INFO_bKGD) is non-zero.
-    */
-   png_color_16 background;
-#endif
-
-#if defined(PNG_oFFs_SUPPORTED)
-   /* The oFFs chunk gives the offset in "offset_unit_type" units rightwards
-    * and downwards from the top-left corner of the display, page, or other
-    * application-specific co-ordinate space.  See the PNG_OFFSET_ defines
-    * below for the unit types.  Valid if (valid & PNG_INFO_oFFs) non-zero.
-    */
-   png_int_32 x_offset; /* x offset on page */
-   png_int_32 y_offset; /* y offset on page */
-   png_byte offset_unit_type; /* offset units type */
-#endif
-
-#if defined(PNG_pHYs_SUPPORTED)
-   /* The pHYs chunk gives the physical pixel density of the image for
-    * display or printing in "phys_unit_type" units (see PNG_RESOLUTION_
-    * defines below).  Data is valid if (valid & PNG_INFO_pHYs) is non-zero.
-    */
-   png_uint_32 x_pixels_per_unit; /* horizontal pixel density */
-   png_uint_32 y_pixels_per_unit; /* vertical pixel density */
-   png_byte phys_unit_type; /* resolution type (see PNG_RESOLUTION_ below) */
-#endif
-
-#if defined(PNG_hIST_SUPPORTED)
-   /* The hIST chunk contains the relative frequency or importance of the
-    * various palette entries, so that a viewer can intelligently select a
-    * reduced-color palette, if required.  Data is an array of "num_palette"
-    * values in the range [0,65535]. Data valid if (valid & PNG_INFO_hIST)
-    * is non-zero.
-    */
-   png_uint_16p hist;
-#endif
-
-#ifdef PNG_cHRM_SUPPORTED
-   /* The cHRM chunk describes the CIE color characteristics of the monitor
-    * on which the PNG was created.  This data allows the viewer to do gamut
-    * mapping of the input image to ensure that the viewer sees the same
-    * colors in the image as the creator.  Values are in the range
-    * [0.0, 0.8].  Data valid if (valid & PNG_INFO_cHRM) non-zero.
-    */
-#ifdef PNG_FLOATING_POINT_SUPPORTED
-   float x_white;
-   float y_white;
-   float x_red;
-   float y_red;
-   float x_green;
-   float y_green;
-   float x_blue;
-   float y_blue;
-#endif
-#endif
-
-#if defined(PNG_pCAL_SUPPORTED)
-   /* The pCAL chunk describes a transformation between the stored pixel
-    * values and original physical data values used to create the image.
-    * The integer range [0, 2^bit_depth - 1] maps to the floating-point
-    * range given by [pcal_X0, pcal_X1], and are further transformed by a
-    * (possibly non-linear) transformation function given by "pcal_type"
-    * and "pcal_params" into "pcal_units".  Please see the PNG_EQUATION_
-    * defines below, and the PNG-Group's PNG extensions document for a
-    * complete description of the transformations and how they should be
-    * implemented, and for a description of the ASCII parameter strings.
-    * Data values are valid if (valid & PNG_INFO_pCAL) non-zero.
-    */
-   png_charp pcal_purpose;  /* pCAL chunk description string */
-   png_int_32 pcal_X0;      /* minimum value */
-   png_int_32 pcal_X1;      /* maximum value */
-   png_charp pcal_units;    /* Latin-1 string giving physical units */
-   png_charpp pcal_params;  /* ASCII strings containing parameter values */
-   png_byte pcal_type;      /* equation type (see PNG_EQUATION_ below) */
-   png_byte pcal_nparams;   /* number of parameters given in pcal_params */
-#endif
-
-/* New members added in libpng-1.0.6 */
-#ifdef PNG_FREE_ME_SUPPORTED
-   png_uint_32 free_me;     /* flags items libpng is responsible for freeing */
-#endif
-
-#if defined(PNG_UNKNOWN_CHUNKS_SUPPORTED)
-   /* storage for unknown chunks that the library doesn't recognize. */
-   png_unknown_chunkp unknown_chunks;
-   png_size_t unknown_chunks_num;
-#endif
-
-#if defined(PNG_iCCP_SUPPORTED)
-   /* iCCP chunk data. */
-   png_charp iccp_name;     /* profile name */
-   png_charp iccp_profile;  /* International Color Consortium profile data */
-                            /* Note to maintainer: should be png_bytep */
-   png_uint_32 iccp_proflen;  /* ICC profile data length */
-   png_byte iccp_compression; /* Always zero */
-#endif
-
-#if defined(PNG_sPLT_SUPPORTED)
-   /* data on sPLT chunks (there may be more than one). */
-   png_sPLT_tp splt_palettes;
-   png_uint_32 splt_palettes_num;
-#endif
-
-#if defined(PNG_sCAL_SUPPORTED)
-   /* The sCAL chunk describes the actual physical dimensions of the
-    * subject matter of the graphic.  The chunk contains a unit specification
-    * a byte value, and two ASCII strings representing floating-point
-    * values.  The values are width and height corresponsing to one pixel
-    * in the image.  This external representation is converted to double
-    * here.  Data values are valid if (valid & PNG_INFO_sCAL) is non-zero.
-    */
-   png_byte scal_unit;         /* unit of physical scale */
-#ifdef PNG_FLOATING_POINT_SUPPORTED
-   double scal_pixel_width;    /* width of one pixel */
-   double scal_pixel_height;   /* height of one pixel */
-#endif
-#ifdef PNG_FIXED_POINT_SUPPORTED
-   png_charp scal_s_width;     /* string containing height */
-   png_charp scal_s_height;    /* string containing width */
-#endif
-#endif
-
-#if defined(PNG_INFO_IMAGE_SUPPORTED)
-   /* Memory has been allocated if (valid & PNG_ALLOCATED_INFO_ROWS) non-zero */
-   /* Data valid if (valid & PNG_INFO_IDAT) non-zero */
-   png_bytepp row_pointers;        /* the image bits */
-#endif
-
-#if defined(PNG_FIXED_POINT_SUPPORTED) && defined(PNG_gAMA_SUPPORTED)
-   png_fixed_point int_gamma; /* gamma of image, if (valid & PNG_INFO_gAMA) */
-#endif
-
-#if defined(PNG_cHRM_SUPPORTED) && defined(PNG_FIXED_POINT_SUPPORTED)
-   png_fixed_point int_x_white;
-   png_fixed_point int_y_white;
-   png_fixed_point int_x_red;
-   png_fixed_point int_y_red;
-   png_fixed_point int_x_green;
-   png_fixed_point int_y_green;
-   png_fixed_point int_x_blue;
-   png_fixed_point int_y_blue;
-#endif
-
-} png_info;
-
+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 */
 #define PNG_UINT_31_MAX ((png_uint_32)0x7fffffffL)
 #define PNG_UINT_32_MAX ((png_uint_32)(-1))
 #define PNG_SIZE_MAX ((png_size_t)(-1))
-#if defined(PNG_1_0_X) || defined (PNG_1_2_X)
-/* PNG_MAX_UINT is deprecated; use PNG_UINT_31_MAX instead. */
-#define PNG_MAX_UINT PNG_UINT_31_MAX
-#endif
+
+/* These are constants for fixed point values encoded in the
+ * PNG specification manner (x100000)
+ */
+#define PNG_FP_1    100000
+#define PNG_FP_HALF  50000
+#define PNG_FP_MAX  ((png_fixed_point)0x7fffffffL)
+#define PNG_FP_MIN  (-PNG_FP_MAX)
 
 /* These describe the color_type field in png_info. */
 /* color type masks */
@@ -1060,53 +829,86 @@
  */
 typedef struct png_row_info_struct
 {
-   png_uint_32 width; /* width of row */
-   png_uint_32 rowbytes; /* number of bytes in row */
-   png_byte color_type; /* color type of row */
-   png_byte bit_depth; /* bit depth of row */
-   png_byte channels; /* number of channels (1, 2, 3, or 4) */
+   png_uint_32 width;    /* width of row */
+   png_size_t rowbytes;  /* number of bytes in row */
+   png_byte color_type;  /* color type of row */
+   png_byte bit_depth;   /* bit depth of row */
+   png_byte channels;    /* number of channels (1, 2, 3, or 4) */
    png_byte pixel_depth; /* bits per pixel (depth * channels) */
 } png_row_info;
 
 typedef png_row_info FAR * png_row_infop;
 typedef png_row_info FAR * FAR * png_row_infopp;
 
+/* The complete definition of png_struct has, as of libpng-1.5.0,
+ * been moved into a separate header file that is not accessible to
+ * applications.  Read libpng-manual.txt or libpng.3 for more info.
+ */
+typedef struct png_struct_def png_struct;
+typedef PNG_CONST png_struct FAR * png_const_structp;
+typedef png_struct FAR * png_structp;
+
 /* These are the function types for the I/O functions and for the functions
  * that allow the user to override the default I/O functions with his or her
  * own.  The png_error_ptr type should match that of user-supplied warning
  * and error functions, while the png_rw_ptr type should match that of the
- * user read/write data functions.
+ * user read/write data functions.  Note that the 'write' function must not
+ * modify the buffer it is passed. The 'read' function, on the other hand, is
+ * expected to return the read data in the buffer.
  */
-typedef struct png_struct_def png_struct;
-typedef png_struct FAR * png_structp;
-
-typedef void (PNGAPI *png_error_ptr) PNGARG((png_structp, png_const_charp));
-typedef void (PNGAPI *png_rw_ptr) PNGARG((png_structp, png_bytep, png_size_t));
-typedef void (PNGAPI *png_flush_ptr) PNGARG((png_structp));
-typedef void (PNGAPI *png_read_status_ptr) PNGARG((png_structp, png_uint_32,
-   int));
-typedef void (PNGAPI *png_write_status_ptr) PNGARG((png_structp, png_uint_32,
-   int));
+typedef PNG_CALLBACK(void, *png_error_ptr, (png_structp, png_const_charp));
+typedef PNG_CALLBACK(void, *png_rw_ptr, (png_structp, png_bytep, png_size_t));
+typedef PNG_CALLBACK(void, *png_flush_ptr, (png_structp));
+typedef PNG_CALLBACK(void, *png_read_status_ptr, (png_structp, png_uint_32,
+    int));
+typedef PNG_CALLBACK(void, *png_write_status_ptr, (png_structp, png_uint_32,
+    int));
 
 #ifdef PNG_PROGRESSIVE_READ_SUPPORTED
-typedef void (PNGAPI *png_progressive_info_ptr) PNGARG((png_structp, png_infop));
-typedef void (PNGAPI *png_progressive_end_ptr) PNGARG((png_structp, png_infop));
-typedef void (PNGAPI *png_progressive_row_ptr) PNGARG((png_structp, png_bytep,
-   png_uint_32, int));
+typedef PNG_CALLBACK(void, *png_progressive_info_ptr, (png_structp, png_infop));
+typedef PNG_CALLBACK(void, *png_progressive_end_ptr, (png_structp, png_infop));
+
+/* The following callback receives png_uint_32 row_number, int pass for the
+ * png_bytep data of the row.  When transforming an interlaced image the
+ * row number is the row number within the sub-image of the interlace pass, so
+ * the value will increase to the height of the sub-image (not the full image)
+ * then reset to 0 for the next pass.
+ *
+ * Use PNG_ROW_FROM_PASS_ROW(row, pass) and PNG_COL_FROM_PASS_COL(col, pass) to
+ * find the output pixel (x,y) given an interlaced sub-image pixel
+ * (row,col,pass).  (See below for these macros.)
+ */
+typedef PNG_CALLBACK(void, *png_progressive_row_ptr, (png_structp, png_bytep,
+    png_uint_32, int));
 #endif
 
 #if defined(PNG_READ_USER_TRANSFORM_SUPPORTED) || \
-    defined(PNG_WRITE_USER_TRANSFORM_SUPPORTED) || \
-    defined(PNG_LEGACY_SUPPORTED)
-typedef void (PNGAPI *png_user_transform_ptr) PNGARG((png_structp,
-    png_row_infop, png_bytep));
+    defined(PNG_WRITE_USER_TRANSFORM_SUPPORTED)
+typedef PNG_CALLBACK(void, *png_user_transform_ptr, (png_structp, png_row_infop,
+    png_bytep));
 #endif
 
-#if defined(PNG_USER_CHUNKS_SUPPORTED)
-typedef int (PNGAPI *png_user_chunk_ptr) PNGARG((png_structp, png_unknown_chunkp));
+#ifdef PNG_USER_CHUNKS_SUPPORTED
+typedef PNG_CALLBACK(int, *png_user_chunk_ptr, (png_structp,
+    png_unknown_chunkp));
 #endif
-#if defined(PNG_UNKNOWN_CHUNKS_SUPPORTED)
-typedef void (PNGAPI *png_unknown_chunk_ptr) PNGARG((png_structp));
+#ifdef PNG_UNKNOWN_CHUNKS_SUPPORTED
+typedef PNG_CALLBACK(void, *png_unknown_chunk_ptr, (png_structp));
+#endif
+
+#ifdef PNG_SETJMP_SUPPORTED
+/* This must match the function definition in <setjmp.h>, and the application
+ * must include this before png.h to obtain the definition of jmp_buf.  The
+ * function is required to be PNG_NORETURN, but this is not checked.  If the
+ * function does return the application will crash via an abort() or similar
+ * system level call.
+ *
+ * If you get a warning here while building the library you may need to make
+ * changes to ensure that pnglibconf.h records the calling convention used by
+ * your compiler.  This may be very difficult - try using a different compiler
+ * to build the library!
+ */
+PNG_FUNCTION(void, (PNGCAPI *png_longjmp_ptr), PNGARG((jmp_buf, int)), typedef);
 #endif
 
 /* Transform masks for the high-level interface */
@@ -1122,667 +924,653 @@
 #define PNG_TRANSFORM_SWAP_ALPHA     0x0100    /* read and write */
 #define PNG_TRANSFORM_SWAP_ENDIAN    0x0200    /* read and write */
 #define PNG_TRANSFORM_INVERT_ALPHA   0x0400    /* read and write */
-#define PNG_TRANSFORM_STRIP_FILLER   0x0800    /* WRITE only */
+#define PNG_TRANSFORM_STRIP_FILLER   0x0800    /* write only */
+/* Added to libpng-1.2.34 */
+#define PNG_TRANSFORM_STRIP_FILLER_BEFORE PNG_TRANSFORM_STRIP_FILLER
+#define PNG_TRANSFORM_STRIP_FILLER_AFTER 0x1000 /* write only */
+/* Added to libpng-1.4.0 */
+#define PNG_TRANSFORM_GRAY_TO_RGB   0x2000      /* read only */
+/* Added to libpng-1.5.4 */
+#define PNG_TRANSFORM_EXPAND_16     0x4000      /* read only */
+#define PNG_TRANSFORM_SCALE_16      0x8000      /* read only */
 
 /* Flags for MNG supported features */
 #define PNG_FLAG_MNG_EMPTY_PLTE     0x01
 #define PNG_FLAG_MNG_FILTER_64      0x04
 #define PNG_ALL_MNG_FEATURES        0x05
 
-typedef png_voidp (*png_malloc_ptr) PNGARG((png_structp, png_size_t));
-typedef void (*png_free_ptr) PNGARG((png_structp, png_voidp));
-
-/* The structure that holds the information to read and write PNG files.
- * The only people who need to care about what is inside of this are the
- * people who will be modifying the library for their own special needs.
- * It should NOT be accessed directly by an application, except to store
- * the jmp_buf.
+/* NOTE: prior to 1.5 these functions had no 'API' style declaration,
+ * this allowed the zlib default functions to be used on Windows
+ * platforms.  In 1.5 the zlib default malloc (which just calls malloc and
+ * ignores the first argument) should be completely compatible with the
+ * following.
  */
-
-struct png_struct_def
-{
-#ifdef PNG_SETJMP_SUPPORTED
-   jmp_buf jmpbuf;            /* used in png_error */
-#endif
-   png_error_ptr error_fn;    /* function for printing errors and aborting */
-   png_error_ptr warning_fn;  /* function for printing warnings */
-   png_voidp error_ptr;       /* user supplied struct for error functions */
-   png_rw_ptr write_data_fn;  /* function for writing output data */
-   png_rw_ptr read_data_fn;   /* function for reading input data */
-   png_voidp io_ptr;          /* ptr to application struct for I/O functions */
-
-#if defined(PNG_READ_USER_TRANSFORM_SUPPORTED)
-   png_user_transform_ptr read_user_transform_fn; /* user read transform */
-#endif
-
-#if defined(PNG_WRITE_USER_TRANSFORM_SUPPORTED)
-   png_user_transform_ptr write_user_transform_fn; /* user write transform */
-#endif
-
-/* These were added in libpng-1.0.2 */
-#if defined(PNG_USER_TRANSFORM_PTR_SUPPORTED)
-#if defined(PNG_READ_USER_TRANSFORM_SUPPORTED) || \
-    defined(PNG_WRITE_USER_TRANSFORM_SUPPORTED)
-   png_voidp user_transform_ptr; /* user supplied struct for user transform */
-   png_byte user_transform_depth;    /* bit depth of user transformed pixels */
-   png_byte user_transform_channels; /* channels in user transformed pixels */
-#endif
-#endif
-
-   png_uint_32 mode;          /* tells us where we are in the PNG file */
-   png_uint_32 flags;         /* flags indicating various things to libpng */
-   png_uint_32 transformations; /* which transformations to perform */
-
-   z_stream zstream;          /* pointer to decompression structure (below) */
-   png_bytep zbuf;            /* buffer for zlib */
-   png_size_t zbuf_size;      /* size of zbuf */
-   int zlib_level;            /* holds zlib compression level */
-   int zlib_method;           /* holds zlib compression method */
-   int zlib_window_bits;      /* holds zlib compression window bits */
-   int zlib_mem_level;        /* holds zlib compression memory level */
-   int zlib_strategy;         /* holds zlib compression strategy */
-
-   png_uint_32 width;         /* width of image in pixels */
-   png_uint_32 height;        /* height of image in pixels */
-   png_uint_32 num_rows;      /* number of rows in current pass */
-   png_uint_32 usr_width;     /* width of row at start of write */
-   png_uint_32 rowbytes;      /* size of row in bytes */
-   png_uint_32 irowbytes;     /* size of current interlaced row in bytes */
-   png_uint_32 iwidth;        /* width of current interlaced row in pixels */
-   png_uint_32 row_number;    /* current row in interlace pass */
-   png_bytep prev_row;        /* buffer to save previous (unfiltered) row */
-   png_bytep row_buf;         /* buffer to save current (unfiltered) row */
-   png_bytep sub_row;         /* buffer to save "sub" row when filtering */
-   png_bytep up_row;          /* buffer to save "up" row when filtering */
-   png_bytep avg_row;         /* buffer to save "avg" row when filtering */
-   png_bytep paeth_row;       /* buffer to save "Paeth" row when filtering */
-   png_row_info row_info;     /* used for transformation routines */
-
-   png_uint_32 idat_size;     /* current IDAT size for read */
-   png_uint_32 crc;           /* current chunk CRC value */
-   png_colorp palette;        /* palette from the input file */
-   png_uint_16 num_palette;   /* number of color entries in palette */
-   png_uint_16 num_trans;     /* number of transparency values */
-   png_byte chunk_name[5];    /* null-terminated name of current chunk */
-   png_byte compression;      /* file compression type (always 0) */
-   png_byte filter;           /* file filter type (always 0) */
-   png_byte interlaced;       /* PNG_INTERLACE_NONE, PNG_INTERLACE_ADAM7 */
-   png_byte pass;             /* current interlace pass (0 - 6) */
-   png_byte do_filter;        /* row filter flags (see PNG_FILTER_ below ) */
-   png_byte color_type;       /* color type of file */
-   png_byte bit_depth;        /* bit depth of file */
-   png_byte usr_bit_depth;    /* bit depth of users row */
-   png_byte pixel_depth;      /* number of bits per pixel */
-   png_byte channels;         /* number of channels in file */
-   png_byte usr_channels;     /* channels at start of write */
-   png_byte sig_bytes;        /* magic bytes read/written from start of file */
-
-#if defined(PNG_READ_FILLER_SUPPORTED) || defined(PNG_WRITE_FILLER_SUPPORTED)
-#ifdef PNG_LEGACY_SUPPORTED
-   png_byte filler;           /* filler byte for pixel expansion */
-#else
-   png_uint_16 filler;           /* filler bytes for pixel expansion */
-#endif
-#endif
-
-#if defined(PNG_bKGD_SUPPORTED)
-   png_byte background_gamma_type;
-#  ifdef PNG_FLOATING_POINT_SUPPORTED
-   float background_gamma;
-#  endif
-   png_color_16 background;   /* background color in screen gamma space */
-#if defined(PNG_READ_GAMMA_SUPPORTED)
-   png_color_16 background_1; /* background normalized to gamma 1.0 */
-#endif
-#endif /* PNG_bKGD_SUPPORTED */
-
-#if defined(PNG_WRITE_FLUSH_SUPPORTED)
-   png_flush_ptr output_flush_fn;/* Function for flushing output */
-   png_uint_32 flush_dist;    /* how many rows apart to flush, 0 - no flush */
-   png_uint_32 flush_rows;    /* number of rows written since last flush */
-#endif
-
-#if defined(PNG_READ_GAMMA_SUPPORTED) || defined(PNG_READ_BACKGROUND_SUPPORTED)
-   int gamma_shift;      /* number of "insignificant" bits 16-bit gamma */
-#ifdef PNG_FLOATING_POINT_SUPPORTED
-   float gamma;          /* file gamma value */
-   float screen_gamma;   /* screen gamma value (display_exponent) */
-#endif
-#endif
-
-#if defined(PNG_READ_GAMMA_SUPPORTED) || defined(PNG_READ_BACKGROUND_SUPPORTED)
-   png_bytep gamma_table;     /* gamma table for 8-bit depth files */
-   png_bytep gamma_from_1;    /* converts from 1.0 to screen */
-   png_bytep gamma_to_1;      /* converts from file to 1.0 */
-   png_uint_16pp gamma_16_table; /* gamma table for 16-bit depth files */
-   png_uint_16pp gamma_16_from_1; /* converts from 1.0 to screen */
-   png_uint_16pp gamma_16_to_1; /* converts from file to 1.0 */
-#endif
-
-#if defined(PNG_READ_GAMMA_SUPPORTED) || defined(PNG_sBIT_SUPPORTED)
-   png_color_8 sig_bit;       /* significant bits in each available channel */
-#endif
-
-#if defined(PNG_READ_SHIFT_SUPPORTED) || defined(PNG_WRITE_SHIFT_SUPPORTED)
-   png_color_8 shift;         /* shift for significant bit tranformation */
-#endif
-
-#if defined(PNG_tRNS_SUPPORTED) || defined(PNG_READ_BACKGROUND_SUPPORTED) \
- || defined(PNG_READ_EXPAND_SUPPORTED) || defined(PNG_READ_BACKGROUND_SUPPORTED)
-   png_bytep trans;           /* transparency values for paletted files */
-   png_color_16 trans_values; /* transparency values for non-paletted files */
-#endif
-
-   png_read_status_ptr read_row_fn;   /* called after each row is decoded */
-   png_write_status_ptr write_row_fn; /* called after each row is encoded */
-#ifdef PNG_PROGRESSIVE_READ_SUPPORTED
-   png_progressive_info_ptr info_fn; /* called after header data fully read */
-   png_progressive_row_ptr row_fn;   /* called after each prog. row is decoded */
-   png_progressive_end_ptr end_fn;   /* called after image is complete */
-   png_bytep save_buffer_ptr;        /* current location in save_buffer */
-   png_bytep save_buffer;            /* buffer for previously read data */
-   png_bytep current_buffer_ptr;     /* current location in current_buffer */
-   png_bytep current_buffer;         /* buffer for recently used data */
-   png_uint_32 push_length;          /* size of current input chunk */
-   png_uint_32 skip_length;          /* bytes to skip in input data */
-   png_size_t save_buffer_size;      /* amount of data now in save_buffer */
-   png_size_t save_buffer_max;       /* total size of save_buffer */
-   png_size_t buffer_size;           /* total amount of available input data */
-   png_size_t current_buffer_size;   /* amount of data now in current_buffer */
-   int process_mode;                 /* what push library is currently doing */
-   int cur_palette;                  /* current push library palette index */
-
-#  if defined(PNG_TEXT_SUPPORTED)
-     png_size_t current_text_size;   /* current size of text input data */
-     png_size_t current_text_left;   /* how much text left to read in input */
-     png_charp current_text;         /* current text chunk buffer */
-     png_charp current_text_ptr;     /* current location in current_text */
-#  endif /* PNG_PROGRESSIVE_READ_SUPPORTED && PNG_TEXT_SUPPORTED */
-
-#endif /* PNG_PROGRESSIVE_READ_SUPPORTED */
-
-#if defined(__TURBOC__) && !defined(_Windows) && !defined(__FLAT__)
-/* for the Borland special 64K segment handler */
-   png_bytepp offset_table_ptr;
-   png_bytep offset_table;
-   png_uint_16 offset_table_number;
-   png_uint_16 offset_table_count;
-   png_uint_16 offset_table_count_free;
-#endif
-
-#if defined(PNG_READ_DITHER_SUPPORTED)
-   png_bytep palette_lookup;         /* lookup table for dithering */
-   png_bytep dither_index;           /* index translation for palette files */
-#endif
-
-#if defined(PNG_READ_DITHER_SUPPORTED) || defined(PNG_hIST_SUPPORTED)
-   png_uint_16p hist;                /* histogram */
-#endif
-
-#if defined(PNG_WRITE_WEIGHTED_FILTER_SUPPORTED)
-   png_byte heuristic_method;        /* heuristic for row filter selection */
-   png_byte num_prev_filters;        /* number of weights for previous rows */
-   png_bytep prev_filters;           /* filter type(s) of previous row(s) */
-   png_uint_16p filter_weights;      /* weight(s) for previous line(s) */
-   png_uint_16p inv_filter_weights;  /* 1/weight(s) for previous line(s) */
-   png_uint_16p filter_costs;        /* relative filter calculation cost */
-   png_uint_16p inv_filter_costs;    /* 1/relative filter calculation cost */
-#endif
-
-#if defined(PNG_TIME_RFC1123_SUPPORTED)
-   png_charp time_buffer;            /* String to hold RFC 1123 time text */
-#endif
-
-/* New members added in libpng-1.0.6 */
-
-#ifdef PNG_FREE_ME_SUPPORTED
-   png_uint_32 free_me;       /* flags items libpng is responsible for freeing */
-#endif
-
-#if defined(PNG_USER_CHUNKS_SUPPORTED)
-   png_voidp user_chunk_ptr;
-   png_user_chunk_ptr read_user_chunk_fn; /* user read chunk handler */
-#endif
-
-#if defined(PNG_UNKNOWN_CHUNKS_SUPPORTED)
-   int num_chunk_list;
-   png_bytep chunk_list;
-#endif
-
-/* New members added in libpng-1.0.3 */
-#if defined(PNG_READ_RGB_TO_GRAY_SUPPORTED)
-   png_byte rgb_to_gray_status;
-   /* These were changed from png_byte in libpng-1.0.6 */
-   png_uint_16 rgb_to_gray_red_coeff;
-   png_uint_16 rgb_to_gray_green_coeff;
-   png_uint_16 rgb_to_gray_blue_coeff;
-#endif
-
-/* New member added in libpng-1.0.4 (renamed in 1.0.9) */
-#if defined(PNG_MNG_FEATURES_SUPPORTED) || \
-    defined(PNG_READ_EMPTY_PLTE_SUPPORTED) || \
-    defined(PNG_WRITE_EMPTY_PLTE_SUPPORTED)
-/* changed from png_byte to png_uint_32 at version 1.2.0 */
-#ifdef PNG_1_0_X
-   png_byte mng_features_permitted;
-#else
-   png_uint_32 mng_features_permitted;
-#endif /* PNG_1_0_X */
-#endif
-
-/* New member added in libpng-1.0.7 */
-#if defined(PNG_READ_GAMMA_SUPPORTED) || defined(PNG_READ_BACKGROUND_SUPPORTED)
-   png_fixed_point int_gamma;
-#endif
-
-/* New member added in libpng-1.0.9, ifdef'ed out in 1.0.12, enabled in 1.2.0 */
-#if defined(PNG_MNG_FEATURES_SUPPORTED)
-   png_byte filter_type;
-#endif
-
-#if defined(PNG_1_0_X) || (defined(PNG_DEBUG) && defined(PNG_USE_PNGGCCRD))
-/* New member added in libpng-1.0.10, ifdef'ed out in 1.2.0 */
-   png_uint_32 row_buf_size;
-#endif
-
-/* New members added in libpng-1.2.0 */
-#if defined(PNG_ASSEMBLER_CODE_SUPPORTED)
-#  if !defined(PNG_1_0_X)
-#    if defined(PNG_MMX_CODE_SUPPORTED)
-   png_byte     mmx_bitdepth_threshold;
-   png_uint_32  mmx_rowbytes_threshold;
-#    endif
-   png_uint_32  asm_flags;
-#  endif
-#endif
-
-/* New members added in libpng-1.0.2 but first enabled by default in 1.2.0 */
-#ifdef PNG_USER_MEM_SUPPORTED
-   png_voidp mem_ptr;                /* user supplied struct for mem functions */
-   png_malloc_ptr malloc_fn;         /* function for allocating memory */
-   png_free_ptr free_fn;             /* function for freeing memory */
-#endif
-
-/* New member added in libpng-1.0.13 and 1.2.0 */
-   png_bytep big_row_buf;         /* buffer to save current (unfiltered) row */
-
-#if defined(PNG_READ_DITHER_SUPPORTED)
-/* The following three members were added at version 1.0.14 and 1.2.4 */
-   png_bytep dither_sort;            /* working sort array */
-   png_bytep index_to_palette;       /* where the original index currently is */
-                                     /* in the palette */
-   png_bytep palette_to_index;       /* which original index points to this */
-                                     /* palette color */
-#endif
-
-/* New members added in libpng-1.0.16 and 1.2.6 */
-   png_byte compression_type;
-
-#ifdef PNG_SET_USER_LIMITS_SUPPORTED
-   png_uint_32 user_width_max;
-   png_uint_32 user_height_max;
-#endif
-
-/* New member added in libpng-1.0.25 and 1.2.17 */
-#if defined(PNG_UNKNOWN_CHUNKS_SUPPORTED)
-   /* storage for unknown chunk that the library doesn't recognize. */
-   png_unknown_chunk unknown_chunk;
-#endif
-};
-
-
-/* This triggers a compiler error in png.c, if png.c and png.h
- * do not agree upon the version number.
- */
-typedef png_structp version_1_2_18;
+typedef PNG_CALLBACK(png_voidp, *png_malloc_ptr, (png_structp,
+    png_alloc_size_t));
+typedef PNG_CALLBACK(void, *png_free_ptr, (png_structp, png_voidp));
 
 typedef png_struct FAR * FAR * png_structpp;
 
-/* Here are the function definitions most commonly used.  This is not
- * the place to find out how to use libpng.  See libpng.txt for the
+/* Section 3: exported functions
+ * Here are the function definitions most commonly used.  This is not
+ * the place to find out how to use libpng.  See libpng-manual.txt for the
  * full explanation, see example.c for the summary.  This just provides
  * a simple one line description of the use of each function.
+ *
+ * The PNG_EXPORT() and PNG_EXPORTA() macros used below are defined in
+ * pngconf.h and in the *.dfn files in the scripts directory.
+ *
+ *   PNG_EXPORT(ordinal, type, name, (args));
+ *
+ *       ordinal:    ordinal that is used while building
+ *                   *.def files. The ordinal value is only
+ *                   relevant when preprocessing png.h with
+ *                   the *.dfn files for building symbol table
+ *                   entries, and are removed by pngconf.h.
+ *       type:       return type of the function
+ *       name:       function name
+ *       args:       function arguments, with types
+ *
+ * When we wish to append attributes to a function prototype we use
+ * the PNG_EXPORTA() macro instead.
+ *
+ *   PNG_EXPORTA(ordinal, type, name, (args), attributes);
+ *
+ *       ordinal, type, name, and args: same as in PNG_EXPORT().
+ *       attributes: function attributes
  */
 
 /* Returns the version number of the library */
-extern PNG_EXPORT(png_uint_32,png_access_version_number) PNGARG((void));
+PNG_EXPORT(1, png_uint_32, png_access_version_number, (void));
 
 /* Tell lib we have already handled the first <num_bytes> magic bytes.
  * Handling more than 8 bytes from the beginning of the file is an error.
  */
-extern PNG_EXPORT(void,png_set_sig_bytes) PNGARG((png_structp png_ptr,
-   int num_bytes));
+PNG_EXPORT(2, void, png_set_sig_bytes, (png_structp png_ptr, int num_bytes));
 
 /* Check sig[start] through sig[start + num_to_check - 1] to see if it's a
  * PNG file.  Returns zero if the supplied bytes match the 8-byte PNG
  * signature, and non-zero otherwise.  Having num_to_check == 0 or
  * start > 7 will always fail (ie return non-zero).
  */
-extern PNG_EXPORT(int,png_sig_cmp) PNGARG((png_bytep sig, png_size_t start,
-   png_size_t num_to_check));
+PNG_EXPORT(3, int, png_sig_cmp, (png_const_bytep sig, png_size_t start,
+    png_size_t num_to_check));
 
 /* Simple signature checking function.  This is the same as calling
  * png_check_sig(sig, n) := !png_sig_cmp(sig, 0, n).
  */
-extern PNG_EXPORT(int,png_check_sig) PNGARG((png_bytep sig, int num));
+#define png_check_sig(sig, n) !png_sig_cmp((sig), 0, (n))
 
 /* Allocate and initialize png_ptr struct for reading, and any other memory. */
-extern PNG_EXPORT(png_structp,png_create_read_struct)
-   PNGARG((png_const_charp user_png_ver, png_voidp error_ptr,
-   png_error_ptr error_fn, png_error_ptr warn_fn));
+PNG_EXPORTA(4, png_structp, png_create_read_struct,
+    (png_const_charp user_png_ver, png_voidp error_ptr,
+    png_error_ptr error_fn, png_error_ptr warn_fn),
+    PNG_ALLOCATED);
 
 /* Allocate and initialize png_ptr struct for writing, and any other memory */
-extern PNG_EXPORT(png_structp,png_create_write_struct)
-   PNGARG((png_const_charp user_png_ver, png_voidp error_ptr,
-   png_error_ptr error_fn, png_error_ptr warn_fn));
+PNG_EXPORTA(5, png_structp, png_create_write_struct,
+    (png_const_charp user_png_ver, png_voidp error_ptr, png_error_ptr error_fn,
+    png_error_ptr warn_fn),
+    PNG_ALLOCATED);
 
-#ifdef PNG_WRITE_SUPPORTED
-extern PNG_EXPORT(png_uint_32,png_get_compression_buffer_size)
-   PNGARG((png_structp png_ptr));
+PNG_EXPORT(6, png_size_t, png_get_compression_buffer_size,
+    (png_const_structp png_ptr));
+
+PNG_EXPORT(7, void, png_set_compression_buffer_size, (png_structp png_ptr,
+    png_size_t size));
+
+/* Moved from pngconf.h in 1.4.0 and modified to ensure setjmp/longjmp
+ * match up.
+ */
+#ifdef PNG_SETJMP_SUPPORTED
+/* This function returns the jmp_buf built in to *png_ptr.  It must be
+ * supplied with an appropriate 'longjmp' function to use on that jmp_buf
+ * unless the default error function is overridden in which case NULL is
+ * acceptable.  The size of the jmp_buf is checked against the actual size
+ * allocated by the library - the call will return NULL on a mismatch
+ * indicating an ABI mismatch.
+ */
+PNG_EXPORT(8, jmp_buf*, png_set_longjmp_fn, (png_structp png_ptr,
+    png_longjmp_ptr longjmp_fn, size_t jmp_buf_size));
+#  define png_jmpbuf(png_ptr) \
+      (*png_set_longjmp_fn((png_ptr), longjmp, sizeof (jmp_buf)))
+#else
+#  define png_jmpbuf(png_ptr) \
+      (LIBPNG_WAS_COMPILED_WITH__PNG_NO_SETJMP)
 #endif
+/* This function should be used by libpng applications in place of
+ * longjmp(png_ptr->jmpbuf, val).  If longjmp_fn() has been set, it
+ * will use it; otherwise it will call PNG_ABORT().  This function was
+ * added in libpng-1.5.0.
+ */
+PNG_EXPORTA(9, void, png_longjmp, (png_structp png_ptr, int val),
+    PNG_NORETURN);
 
-#ifdef PNG_WRITE_SUPPORTED
-extern PNG_EXPORT(void,png_set_compression_buffer_size)
-   PNGARG((png_structp png_ptr, png_uint_32 size));
+#ifdef PNG_READ_SUPPORTED
+/* Reset the compression stream */
+PNG_EXPORT(10, int, png_reset_zstream, (png_structp png_ptr));
 #endif
 
-/* Reset the compression stream */
-extern PNG_EXPORT(int,png_reset_zstream) PNGARG((png_structp png_ptr));
-
 /* New functions added in libpng-1.0.2 (not enabled by default until 1.2.0) */
 #ifdef PNG_USER_MEM_SUPPORTED
-extern PNG_EXPORT(png_structp,png_create_read_struct_2)
-   PNGARG((png_const_charp user_png_ver, png_voidp error_ptr,
-   png_error_ptr error_fn, png_error_ptr warn_fn, png_voidp mem_ptr,
-   png_malloc_ptr malloc_fn, png_free_ptr free_fn));
-extern PNG_EXPORT(png_structp,png_create_write_struct_2)
-   PNGARG((png_const_charp user_png_ver, png_voidp error_ptr,
-   png_error_ptr error_fn, png_error_ptr warn_fn, png_voidp mem_ptr,
-   png_malloc_ptr malloc_fn, png_free_ptr free_fn));
+PNG_EXPORTA(11, png_structp, png_create_read_struct_2,
+    (png_const_charp user_png_ver, png_voidp error_ptr, png_error_ptr error_fn,
+    png_error_ptr warn_fn,
+    png_voidp mem_ptr, png_malloc_ptr malloc_fn, png_free_ptr free_fn),
+    PNG_ALLOCATED);
+PNG_EXPORTA(12, png_structp, png_create_write_struct_2,
+    (png_const_charp user_png_ver, png_voidp error_ptr, png_error_ptr error_fn,
+    png_error_ptr warn_fn,
+    png_voidp mem_ptr, png_malloc_ptr malloc_fn, png_free_ptr free_fn),
+    PNG_ALLOCATED);
 #endif
 
+/* Write the PNG file signature. */
+PNG_EXPORT(13, void, png_write_sig, (png_structp png_ptr));
+
 /* Write a PNG chunk - size, type, (optional) data, CRC. */
-extern PNG_EXPORT(void,png_write_chunk) PNGARG((png_structp png_ptr,
-   png_bytep chunk_name, png_bytep data, png_size_t length));
+PNG_EXPORT(14, void, png_write_chunk, (png_structp png_ptr, png_const_bytep
+    chunk_name, png_const_bytep data, png_size_t length));
 
 /* Write the start of a PNG chunk - length and chunk name. */
-extern PNG_EXPORT(void,png_write_chunk_start) PNGARG((png_structp png_ptr,
-   png_bytep chunk_name, png_uint_32 length));
+PNG_EXPORT(15, void, png_write_chunk_start, (png_structp png_ptr,
+    png_const_bytep chunk_name, png_uint_32 length));
 
 /* Write the data of a PNG chunk started with png_write_chunk_start(). */
-extern PNG_EXPORT(void,png_write_chunk_data) PNGARG((png_structp png_ptr,
-   png_bytep data, png_size_t length));
+PNG_EXPORT(16, void, png_write_chunk_data, (png_structp png_ptr,
+    png_const_bytep data, png_size_t length));
 
 /* Finish a chunk started with png_write_chunk_start() (includes CRC). */
-extern PNG_EXPORT(void,png_write_chunk_end) PNGARG((png_structp png_ptr));
+PNG_EXPORT(17, void, png_write_chunk_end, (png_structp png_ptr));
 
 /* Allocate and initialize the info structure */
-extern PNG_EXPORT(png_infop,png_create_info_struct)
-   PNGARG((png_structp png_ptr));
+PNG_EXPORTA(18, png_infop, png_create_info_struct, (png_structp png_ptr),
+    PNG_ALLOCATED);
 
-#if defined(PNG_1_0_X) || defined (PNG_1_2_X)
-/* Initialize the info structure (old interface - DEPRECATED) */
-extern PNG_EXPORT(void,png_info_init) PNGARG((png_infop info_ptr));
-#undef png_info_init
-#define png_info_init(info_ptr) png_info_init_3(&info_ptr,\
-    png_sizeof(png_info));
-#endif
-
-extern PNG_EXPORT(void,png_info_init_3) PNGARG((png_infopp info_ptr,
+PNG_EXPORT(19, void, png_info_init_3, (png_infopp info_ptr,
     png_size_t png_info_struct_size));
 
 /* Writes all the PNG information before the image. */
-extern PNG_EXPORT(void,png_write_info_before_PLTE) PNGARG((png_structp png_ptr,
-   png_infop info_ptr));
-extern PNG_EXPORT(void,png_write_info) PNGARG((png_structp png_ptr,
-   png_infop info_ptr));
+PNG_EXPORT(20, void, png_write_info_before_PLTE,
+    (png_structp png_ptr, png_infop info_ptr));
+PNG_EXPORT(21, void, png_write_info,
+    (png_structp png_ptr, png_infop info_ptr));
 
-#ifndef PNG_NO_SEQUENTIAL_READ_SUPPORTED
-/* read the information before the actual image data. */
-extern PNG_EXPORT(void,png_read_info) PNGARG((png_structp png_ptr,
-   png_infop info_ptr));
+#ifdef PNG_SEQUENTIAL_READ_SUPPORTED
+/* Read the information before the actual image data. */
+PNG_EXPORT(22, void, png_read_info,
+    (png_structp png_ptr, png_infop info_ptr));
 #endif
 
-#if defined(PNG_TIME_RFC1123_SUPPORTED)
-extern PNG_EXPORT(png_charp,png_convert_to_rfc1123)
-   PNGARG((png_structp png_ptr, png_timep ptime));
+#ifdef PNG_TIME_RFC1123_SUPPORTED
+PNG_EXPORT(23, png_const_charp, png_convert_to_rfc1123,
+    (png_structp png_ptr,
+    png_const_timep ptime));
 #endif
 
-#if !defined(_WIN32_WCE)
-/* "time.h" functions are not supported on WindowsCE */
-#if defined(PNG_WRITE_tIME_SUPPORTED)
-/* convert from a struct tm to png_time */
-extern PNG_EXPORT(void,png_convert_from_struct_tm) PNGARG((png_timep ptime,
-   struct tm FAR * ttime));
+#ifdef PNG_CONVERT_tIME_SUPPORTED
+/* Convert from a struct tm to png_time */
+PNG_EXPORT(24, void, png_convert_from_struct_tm, (png_timep ptime,
+    PNG_CONST struct tm FAR * ttime));
 
-/* convert from time_t to png_time.  Uses gmtime() */
-extern PNG_EXPORT(void,png_convert_from_time_t) PNGARG((png_timep ptime,
-   time_t ttime));
-#endif /* PNG_WRITE_tIME_SUPPORTED */
-#endif /* _WIN32_WCE */
+/* Convert from time_t to png_time.  Uses gmtime() */
+PNG_EXPORT(25, void, png_convert_from_time_t,
+    (png_timep ptime, time_t ttime));
+#endif /* PNG_CONVERT_tIME_SUPPORTED */
 
-#if defined(PNG_READ_EXPAND_SUPPORTED)
+#ifdef PNG_READ_EXPAND_SUPPORTED
 /* Expand data to 24-bit RGB, or 8-bit grayscale, with alpha if available. */
-extern PNG_EXPORT(void,png_set_expand) PNGARG((png_structp png_ptr));
-#if !defined(PNG_1_0_X)
-extern PNG_EXPORT(void,png_set_expand_gray_1_2_4_to_8) PNGARG((png_structp
-  png_ptr));
+PNG_EXPORT(26, void, png_set_expand, (png_structp png_ptr));
+PNG_EXPORT(27, void, png_set_expand_gray_1_2_4_to_8, (png_structp png_ptr));
+PNG_EXPORT(28, void, png_set_palette_to_rgb, (png_structp png_ptr));
+PNG_EXPORT(29, void, png_set_tRNS_to_alpha, (png_structp png_ptr));
 #endif
-extern PNG_EXPORT(void,png_set_palette_to_rgb) PNGARG((png_structp png_ptr));
-extern PNG_EXPORT(void,png_set_tRNS_to_alpha) PNGARG((png_structp png_ptr));
-#if defined(PNG_1_0_X) || defined (PNG_1_2_X)
-/* Deprecated */
-extern PNG_EXPORT(void,png_set_gray_1_2_4_to_8) PNGARG((png_structp png_ptr));
-#endif
+
+#ifdef PNG_READ_EXPAND_16_SUPPORTED
+/* Expand to 16-bit channels, forces conversion of palette to RGB and expansion
+ * of a tRNS chunk if present.
+ */
+PNG_EXPORT(221, void, png_set_expand_16, (png_structp png_ptr));
 #endif
 
 #if defined(PNG_READ_BGR_SUPPORTED) || defined(PNG_WRITE_BGR_SUPPORTED)
 /* Use blue, green, red order for pixels. */
-extern PNG_EXPORT(void,png_set_bgr) PNGARG((png_structp png_ptr));
+PNG_EXPORT(30, void, png_set_bgr, (png_structp png_ptr));
 #endif
 
-#if defined(PNG_READ_GRAY_TO_RGB_SUPPORTED)
+#ifdef PNG_READ_GRAY_TO_RGB_SUPPORTED
 /* Expand the grayscale to 24-bit RGB if necessary. */
-extern PNG_EXPORT(void,png_set_gray_to_rgb) PNGARG((png_structp png_ptr));
+PNG_EXPORT(31, void, png_set_gray_to_rgb, (png_structp png_ptr));
 #endif
 
-#if defined(PNG_READ_RGB_TO_GRAY_SUPPORTED)
+#ifdef PNG_READ_RGB_TO_GRAY_SUPPORTED
 /* Reduce RGB to grayscale. */
-#ifdef PNG_FLOATING_POINT_SUPPORTED
-extern PNG_EXPORT(void,png_set_rgb_to_gray) PNGARG((png_structp png_ptr,
-   int error_action, double red, double green ));
-#endif
-extern PNG_EXPORT(void,png_set_rgb_to_gray_fixed) PNGARG((png_structp png_ptr,
-   int error_action, png_fixed_point red, png_fixed_point green ));
-extern PNG_EXPORT(png_byte,png_get_rgb_to_gray_status) PNGARG((png_structp
-   png_ptr));
+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_const_structp
+    png_ptr));
 #endif
 
-extern PNG_EXPORT(void,png_build_grayscale_palette) PNGARG((int bit_depth,
-   png_colorp palette));
+#ifdef PNG_BUILD_GRAYSCALE_PALETTE_SUPPORTED
+PNG_EXPORT(35, void, png_build_grayscale_palette, (int bit_depth,
+    png_colorp palette));
+#endif
 
-#if defined(PNG_READ_STRIP_ALPHA_SUPPORTED)
-extern PNG_EXPORT(void,png_set_strip_alpha) PNGARG((png_structp png_ptr));
+#ifdef PNG_READ_ALPHA_MODE_SUPPORTED
+/* How the alpha channel is interpreted - this affects how the color channels of
+ * a PNG file are returned when an alpha channel, or tRNS chunk in a palette
+ * file, is present.
+ *
+ * This has no effect on the way pixels are written into a PNG output
+ * datastream. The color samples in a PNG datastream are never premultiplied
+ * with the alpha samples.
+ *
+ * The default is to return data according to the PNG specification: the alpha
+ * channel is a linear measure of the contribution of the pixel to the
+ * corresponding composited pixel.  The gamma encoded color channels must be
+ * scaled according to the contribution and to do this it is necessary to undo
+ * the encoding, scale the color values, perform the composition and reencode
+ * the values.  This is the 'PNG' mode.
+ *
+ * The alternative is to 'associate' the alpha with the color information by
+ * storing color channel values that have been scaled by the alpha.  The
+ * advantage is that the color channels can be resampled (the image can be
+ * scaled) in this form.  The disadvantage is that normal practice is to store
+ * linear, not (gamma) encoded, values and this requires 16-bit channels for
+ * still images rather than the 8-bit channels that are just about sufficient if
+ * gamma encoding is used.  In addition all non-transparent pixel values,
+ * including completely opaque ones, must be gamma encoded to produce the final
+ * image.  This is the 'STANDARD', 'ASSOCIATED' or 'PREMULTIPLIED' mode (the
+ * latter being the two common names for associated alpha color channels.)
+ *
+ * Since it is not necessary to perform arithmetic on opaque color values so
+ * long as they are not to be resampled and are in the final color space it is
+ * possible to optimize the handling of alpha by storing the opaque pixels in
+ * the PNG format (adjusted for the output color space) while storing partially
+ * opaque pixels in the standard, linear, format.  The accuracy required for
+ * standard alpha composition is relatively low, because the pixels are
+ * isolated, therefore typically the accuracy loss in storing 8-bit linear
+ * values is acceptable.  (This is not true if the alpha channel is used to
+ * simulate transparency over large areas - use 16 bits or the PNG mode in
+ * this case!)  This is the 'OPTIMIZED' mode.  For this mode a pixel is
+ * treated as opaque only if the alpha value is equal to the maximum value.
+ *
+ * The final choice is to gamma encode the alpha channel as well.  This is
+ * broken because, in practice, no implementation that uses this choice
+ * correctly undoes the encoding before handling alpha composition.  Use this
+ * choice only if other serious errors in the software or hardware you use
+ * mandate it; the typical serious error is for dark halos to appear around
+ * opaque areas of the composited PNG image because of arithmetic overflow.
+ *
+ * The API function png_set_alpha_mode specifies which of these choices to use
+ * with an enumerated 'mode' value and the gamma of the required output:
+ */
+#define PNG_ALPHA_PNG           0 /* according to the PNG standard */
+#define PNG_ALPHA_STANDARD      1 /* according to Porter/Duff */
+#define PNG_ALPHA_ASSOCIATED    1 /* as above; this is the normal practice */
+#define PNG_ALPHA_PREMULTIPLIED 1 /* as above */
+#define PNG_ALPHA_OPTIMIZED     2 /* 'PNG' for opaque pixels, else 'STANDARD' */
+#define PNG_ALPHA_BROKEN        3 /* the alpha channel is gamma encoded */
+
+PNG_FP_EXPORT(227, void, png_set_alpha_mode, (png_structp png_ptr, int mode,
+    double output_gamma));
+PNG_FIXED_EXPORT(228, void, png_set_alpha_mode_fixed, (png_structp png_ptr,
+    int mode, png_fixed_point output_gamma));
+#endif
+
+#if defined(PNG_READ_GAMMA_SUPPORTED) || defined(PNG_READ_ALPHA_MODE_SUPPORTED)
+/* The output_gamma value is a screen gamma in libpng terminology: it expresses
+ * how to decode the output values, not how they are encoded.  The values used
+ * correspond to the normal numbers used to describe the overall gamma of a
+ * computer display system; for example 2.2 for an sRGB conformant system.  The
+ * values are scaled by 100000 in the _fixed version of the API (so 220000 for
+ * sRGB.)
+ *
+ * The inverse of the value is always used to provide a default for the PNG file
+ * encoding if it has no gAMA chunk and if png_set_gamma() has not been called
+ * to override the PNG gamma information.
+ *
+ * When the ALPHA_OPTIMIZED mode is selected the output gamma is used to encode
+ * opaque pixels however pixels with lower alpha values are not encoded,
+ * regardless of the output gamma setting.
+ *
+ * When the standard Porter Duff handling is requested with mode 1 the output
+ * encoding is set to be linear and the output_gamma value is only relevant
+ * as a default for input data that has no gamma information.  The linear output
+ * encoding will be overridden if png_set_gamma() is called - the results may be
+ * highly unexpected!
+ *
+ * The following numbers are derived from the sRGB standard and the research
+ * behind it.  sRGB is defined to be approximated by a PNG gAMA chunk value of
+ * 0.45455 (1/2.2) for PNG.  The value implicitly includes any viewing
+ * correction required to take account of any differences in the color
+ * environment of the original scene and the intended display environment; the
+ * value expresses how to *decode* the image for display, not how the original
+ * data was *encoded*.
+ *
+ * sRGB provides a peg for the PNG standard by defining a viewing environment.
+ * sRGB itself, and earlier TV standards, actually use a more complex transform
+ * (a linear portion then a gamma 2.4 power law) than PNG can express.  (PNG is
+ * limited to simple power laws.)  By saying that an image for direct display on
+ * an sRGB conformant system should be stored with a gAMA chunk value of 45455
+ * (11.3.3.2 and 11.3.3.5 of the ISO PNG specification) the PNG specification
+ * makes it possible to derive values for other display systems and
+ * environments.
+ *
+ * The Mac value is deduced from the sRGB based on an assumption that the actual
+ * extra viewing correction used in early Mac display systems was implemented as
+ * a power 1.45 lookup table.
+ *
+ * Any system where a programmable lookup table is used or where the behavior of
+ * the final display device characteristics can be changed requires system
+ * specific code to obtain the current characteristic.  However this can be
+ * difficult and most PNG gamma correction only requires an approximate value.
+ *
+ * By default, if png_set_alpha_mode() is not called, libpng assumes that all
+ * values are unencoded, linear, values and that the output device also has a
+ * linear characteristic.  This is only very rarely correct - it is invariably
+ * better to call png_set_alpha_mode() with PNG_DEFAULT_sRGB than rely on the
+ * default if you don't know what the right answer is!
+ *
+ * The special value PNG_GAMMA_MAC_18 indicates an older Mac system (pre Mac OS
+ * 10.6) which used a correction table to implement a somewhat lower gamma on an
+ * otherwise sRGB system.
+ *
+ * Both these values are reserved (not simple gamma values) in order to allow
+ * more precise correction internally in the future.
+ *
+ * NOTE: the following values can be passed to either the fixed or floating
+ * point APIs, but the floating point API will also accept floating point
+ * values.
+ */
+#define PNG_DEFAULT_sRGB -1       /* sRGB gamma and color space */
+#define PNG_GAMMA_MAC_18 -2       /* Old Mac '1.8' gamma and color space */
+#define PNG_GAMMA_sRGB   220000   /* Television standards--matches sRGB gamma */
+#define PNG_GAMMA_LINEAR PNG_FP_1 /* Linear */
+#endif
+
+/* The following are examples of calls to png_set_alpha_mode to achieve the
+ * required overall gamma correction and, where necessary, alpha
+ * premultiplication.
+ *
+ * png_set_alpha_mode(pp, PNG_ALPHA_PNG, PNG_DEFAULT_sRGB);
+ *    This is the default libpng handling of the alpha channel - it is not
+ *    pre-multiplied into the color components.  In addition the call states
+ *    that the output is for a sRGB system and causes all PNG files without gAMA
+ *    chunks to be assumed to be encoded using sRGB.
+ *
+ * png_set_alpha_mode(pp, PNG_ALPHA_PNG, PNG_GAMMA_MAC);
+ *    In this case the output is assumed to be something like an sRGB conformant
+ *    display preceeded by a power-law lookup table of power 1.45.  This is how
+ *    early Mac systems behaved.
+ *
+ * png_set_alpha_mode(pp, PNG_ALPHA_STANDARD, PNG_GAMMA_LINEAR);
+ *    This is the classic Jim Blinn approach and will work in academic
+ *    environments where everything is done by the book.  It has the shortcoming
+ *    of assuming that input PNG data with no gamma information is linear - this
+ *    is unlikely to be correct unless the PNG files where generated locally.
+ *    Most of the time the output precision will be so low as to show
+ *    significant banding in dark areas of the image.
+ *
+ * png_set_expand_16(pp);
+ * png_set_alpha_mode(pp, PNG_ALPHA_STANDARD, PNG_DEFAULT_sRGB);
+ *    This is a somewhat more realistic Jim Blinn inspired approach.  PNG files
+ *    are assumed to have the sRGB encoding if not marked with a gamma value and
+ *    the output is always 16 bits per component.  This permits accurate scaling
+ *    and processing of the data.  If you know that your input PNG files were
+ *    generated locally you might need to replace PNG_DEFAULT_sRGB with the
+ *    correct value for your system.
+ *
+ * png_set_alpha_mode(pp, PNG_ALPHA_OPTIMIZED, PNG_DEFAULT_sRGB);
+ *    If you just need to composite the PNG image onto an existing background
+ *    and if you control the code that does this you can use the optimization
+ *    setting.  In this case you just copy completely opaque pixels to the
+ *    output.  For pixels that are not completely transparent (you just skip
+ *    those) you do the composition math using png_composite or png_composite_16
+ *    below then encode the resultant 8-bit or 16-bit values to match the output
+ *    encoding.
+ *
+ * Other cases
+ *    If neither the PNG nor the standard linear encoding work for you because
+ *    of the software or hardware you use then you have a big problem.  The PNG
+ *    case will probably result in halos around the image.  The linear encoding
+ *    will probably result in a washed out, too bright, image (it's actually too
+ *    contrasty.)  Try the ALPHA_OPTIMIZED mode above - this will probably
+ *    substantially reduce the halos.  Alternatively try:
+ *
+ * png_set_alpha_mode(pp, PNG_ALPHA_BROKEN, PNG_DEFAULT_sRGB);
+ *    This option will also reduce the halos, but there will be slight dark
+ *    halos round the opaque parts of the image where the background is light.
+ *    In the OPTIMIZED mode the halos will be light halos where the background
+ *    is dark.  Take your pick - the halos are unavoidable unless you can get
+ *    your hardware/software fixed!  (The OPTIMIZED approach is slightly
+ *    faster.)
+ *
+ * When the default gamma of PNG files doesn't match the output gamma.
+ *    If you have PNG files with no gamma information png_set_alpha_mode allows
+ *    you to provide a default gamma, but it also sets the ouput gamma to the
+ *    matching value.  If you know your PNG files have a gamma that doesn't
+ *    match the output you can take advantage of the fact that
+ *    png_set_alpha_mode always sets the output gamma but only sets the PNG
+ *    default if it is not already set:
+ *
+ * png_set_alpha_mode(pp, PNG_ALPHA_PNG, PNG_DEFAULT_sRGB);
+ * png_set_alpha_mode(pp, PNG_ALPHA_PNG, PNG_GAMMA_MAC);
+ *    The first call sets both the default and the output gamma values, the
+ *    second call overrides the output gamma without changing the default.  This
+ *    is easier than achieving the same effect with png_set_gamma.  You must use
+ *    PNG_ALPHA_PNG for the first call - internal checking in png_set_alpha will
+ *    fire if more than one call to png_set_alpha_mode and png_set_background is
+ *    made in the same read operation, however multiple calls with PNG_ALPHA_PNG
+ *    are ignored.
+ */
+
+#ifdef PNG_READ_STRIP_ALPHA_SUPPORTED
+PNG_EXPORT(36, void, png_set_strip_alpha, (png_structp png_ptr));
 #endif
 
 #if defined(PNG_READ_SWAP_ALPHA_SUPPORTED) || \
     defined(PNG_WRITE_SWAP_ALPHA_SUPPORTED)
-extern PNG_EXPORT(void,png_set_swap_alpha) PNGARG((png_structp png_ptr));
+PNG_EXPORT(37, void, png_set_swap_alpha, (png_structp png_ptr));
 #endif
 
 #if defined(PNG_READ_INVERT_ALPHA_SUPPORTED) || \
     defined(PNG_WRITE_INVERT_ALPHA_SUPPORTED)
-extern PNG_EXPORT(void,png_set_invert_alpha) PNGARG((png_structp png_ptr));
+PNG_EXPORT(38, void, png_set_invert_alpha, (png_structp png_ptr));
 #endif
 
 #if defined(PNG_READ_FILLER_SUPPORTED) || defined(PNG_WRITE_FILLER_SUPPORTED)
 /* Add a filler byte to 8-bit Gray or 24-bit RGB images. */
-extern PNG_EXPORT(void,png_set_filler) PNGARG((png_structp png_ptr,
-   png_uint_32 filler, int flags));
+PNG_EXPORT(39, void, png_set_filler, (png_structp png_ptr, png_uint_32 filler,
+    int flags));
 /* The values of the PNG_FILLER_ defines should NOT be changed */
-#define PNG_FILLER_BEFORE 0
-#define PNG_FILLER_AFTER 1
+#  define PNG_FILLER_BEFORE 0
+#  define PNG_FILLER_AFTER 1
 /* Add an alpha byte to 8-bit Gray or 24-bit RGB images. */
-#if !defined(PNG_1_0_X)
-extern PNG_EXPORT(void,png_set_add_alpha) PNGARG((png_structp png_ptr,
-   png_uint_32 filler, int flags));
-#endif
+PNG_EXPORT(40, void, png_set_add_alpha,
+    (png_structp png_ptr, png_uint_32 filler,
+    int flags));
 #endif /* PNG_READ_FILLER_SUPPORTED || PNG_WRITE_FILLER_SUPPORTED */
 
 #if defined(PNG_READ_SWAP_SUPPORTED) || defined(PNG_WRITE_SWAP_SUPPORTED)
 /* Swap bytes in 16-bit depth files. */
-extern PNG_EXPORT(void,png_set_swap) PNGARG((png_structp png_ptr));
+PNG_EXPORT(41, void, png_set_swap, (png_structp png_ptr));
 #endif
 
 #if defined(PNG_READ_PACK_SUPPORTED) || defined(PNG_WRITE_PACK_SUPPORTED)
 /* Use 1 byte per pixel in 1, 2, or 4-bit depth files. */
-extern PNG_EXPORT(void,png_set_packing) PNGARG((png_structp png_ptr));
+PNG_EXPORT(42, void, png_set_packing, (png_structp png_ptr));
 #endif
 
-#if defined(PNG_READ_PACKSWAP_SUPPORTED) || defined(PNG_WRITE_PACKSWAP_SUPPORTED)
+#if defined(PNG_READ_PACKSWAP_SUPPORTED) || \
+    defined(PNG_WRITE_PACKSWAP_SUPPORTED)
 /* Swap packing order of pixels in bytes. */
-extern PNG_EXPORT(void,png_set_packswap) PNGARG((png_structp png_ptr));
+PNG_EXPORT(43, void, png_set_packswap, (png_structp png_ptr));
 #endif
 
 #if defined(PNG_READ_SHIFT_SUPPORTED) || defined(PNG_WRITE_SHIFT_SUPPORTED)
 /* Converts files to legal bit depths. */
-extern PNG_EXPORT(void,png_set_shift) PNGARG((png_structp png_ptr,
-   png_color_8p true_bits));
+PNG_EXPORT(44, void, png_set_shift, (png_structp png_ptr, png_const_color_8p
+    true_bits));
 #endif
 
 #if defined(PNG_READ_INTERLACING_SUPPORTED) || \
     defined(PNG_WRITE_INTERLACING_SUPPORTED)
-/* Have the code handle the interlacing.  Returns the number of passes. */
-extern PNG_EXPORT(int,png_set_interlace_handling) PNGARG((png_structp png_ptr));
+/* Have the code handle the interlacing.  Returns the number of passes.
+ * MUST be called before png_read_update_info or png_start_read_image,
+ * otherwise it will not have the desired effect.  Note that it is still
+ * necessary to call png_read_row or png_read_rows png_get_image_height
+ * times for each pass.
+*/
+PNG_EXPORT(45, int, png_set_interlace_handling, (png_structp png_ptr));
 #endif
 
 #if defined(PNG_READ_INVERT_SUPPORTED) || defined(PNG_WRITE_INVERT_SUPPORTED)
 /* Invert monochrome files */
-extern PNG_EXPORT(void,png_set_invert_mono) PNGARG((png_structp png_ptr));
+PNG_EXPORT(46, void, png_set_invert_mono, (png_structp png_ptr));
 #endif
 
-#if defined(PNG_READ_BACKGROUND_SUPPORTED)
-/* Handle alpha and tRNS by replacing with a background color. */
-#ifdef PNG_FLOATING_POINT_SUPPORTED
-extern PNG_EXPORT(void,png_set_background) PNGARG((png_structp png_ptr,
-   png_color_16p background_color, int background_gamma_code,
-   int need_expand, double background_gamma));
+#ifdef PNG_READ_BACKGROUND_SUPPORTED
+/* Handle alpha and tRNS by replacing with a background color.  Prior to
+ * libpng-1.5.4 this API must not be called before the PNG file header has been
+ * read.  Doing so will result in unexpected behavior and possible warnings or
+ * errors if the PNG file contains a bKGD chunk.
+ */
+PNG_FP_EXPORT(47, void, png_set_background, (png_structp png_ptr,
+    png_const_color_16p background_color, int background_gamma_code,
+    int need_expand, double background_gamma));
+PNG_FIXED_EXPORT(215, void, png_set_background_fixed, (png_structp png_ptr,
+    png_const_color_16p background_color, int background_gamma_code,
+    int need_expand, png_fixed_point background_gamma));
 #endif
-#define PNG_BACKGROUND_GAMMA_UNKNOWN 0
-#define PNG_BACKGROUND_GAMMA_SCREEN  1
-#define PNG_BACKGROUND_GAMMA_FILE    2
-#define PNG_BACKGROUND_GAMMA_UNIQUE  3
+#ifdef PNG_READ_BACKGROUND_SUPPORTED
+#  define PNG_BACKGROUND_GAMMA_UNKNOWN 0
+#  define PNG_BACKGROUND_GAMMA_SCREEN  1
+#  define PNG_BACKGROUND_GAMMA_FILE    2
+#  define PNG_BACKGROUND_GAMMA_UNIQUE  3
 #endif
 
-#if defined(PNG_READ_16_TO_8_SUPPORTED)
-/* strip the second byte of information from a 16-bit depth file. */
-extern PNG_EXPORT(void,png_set_strip_16) PNGARG((png_structp png_ptr));
+#ifdef PNG_READ_SCALE_16_TO_8_SUPPORTED
+/* Scale a 16-bit depth file down to 8-bit, accurately. */
+PNG_EXPORT(229, void, png_set_scale_16, (png_structp png_ptr));
 #endif
 
-#if defined(PNG_READ_DITHER_SUPPORTED)
-/* Turn on dithering, and reduce the palette to the number of colors available. */
-extern PNG_EXPORT(void,png_set_dither) PNGARG((png_structp png_ptr,
-   png_colorp palette, int num_palette, int maximum_colors,
-   png_uint_16p histogram, int full_dither));
+#ifdef PNG_READ_STRIP_16_TO_8_SUPPORTED
+#define PNG_READ_16_TO_8 SUPPORTED /* Name prior to 1.5.4 */
+/* Strip the second byte of information from a 16-bit depth file. */
+PNG_EXPORT(48, void, png_set_strip_16, (png_structp png_ptr));
 #endif
 
-#if defined(PNG_READ_GAMMA_SUPPORTED)
-/* Handle gamma correction. Screen_gamma=(display_exponent) */
-#ifdef PNG_FLOATING_POINT_SUPPORTED
-extern PNG_EXPORT(void,png_set_gamma) PNGARG((png_structp png_ptr,
-   double screen_gamma, double default_file_gamma));
-#endif
+#ifdef PNG_READ_QUANTIZE_SUPPORTED
+/* Turn on quantizing, and reduce the palette to the number of colors
+ * available.
+ */
+PNG_EXPORT(49, void, png_set_quantize,
+    (png_structp png_ptr, png_colorp palette,
+    int num_palette, int maximum_colors, png_const_uint_16p histogram,
+    int full_quantize));
 #endif
 
-#if defined(PNG_1_0_X) || defined (PNG_1_2_X)
-#if defined(PNG_READ_EMPTY_PLTE_SUPPORTED) || \
-    defined(PNG_WRITE_EMPTY_PLTE_SUPPORTED)
-/* Permit or disallow empty PLTE (0: not permitted, 1: permitted) */
-/* Deprecated and will be removed.  Use png_permit_mng_features() instead. */
-extern PNG_EXPORT(void,png_permit_empty_plte) PNGARG((png_structp png_ptr,
-   int empty_plte_permitted));
-#endif
+#ifdef PNG_READ_GAMMA_SUPPORTED
+/* The threshold on gamma processing is configurable but hard-wired into the
+ * library.  The following is the floating point variant.
+ */
+#define PNG_GAMMA_THRESHOLD (PNG_GAMMA_THRESHOLD_FIXED*.00001)
+
+/* Handle gamma correction. Screen_gamma=(display_exponent).
+ * NOTE: this API simply sets the screen and file gamma values. It will
+ * therefore override the value for gamma in a PNG file if it is called after
+ * the file header has been read - use with care  - call before reading the PNG
+ * file for best results!
+ *
+ * These routines accept the same gamma values as png_set_alpha_mode (described
+ * above).  The PNG_GAMMA_ defines and PNG_DEFAULT_sRGB can be passed to either
+ * API (floating point or fixed.)  Notice, however, that the 'file_gamma' value
+ * is the inverse of a 'screen gamma' value.
+ */
+PNG_FP_EXPORT(50, void, png_set_gamma,
+    (png_structp png_ptr, double screen_gamma,
+    double override_file_gamma));
+PNG_FIXED_EXPORT(208, void, png_set_gamma_fixed, (png_structp png_ptr,
+    png_fixed_point screen_gamma, png_fixed_point override_file_gamma));
 #endif
 
-#if defined(PNG_WRITE_FLUSH_SUPPORTED)
+#ifdef PNG_WRITE_FLUSH_SUPPORTED
 /* Set how many lines between output flushes - 0 for no flushing */
-extern PNG_EXPORT(void,png_set_flush) PNGARG((png_structp png_ptr, int nrows));
+PNG_EXPORT(51, void, png_set_flush, (png_structp png_ptr, int nrows));
 /* Flush the current PNG output buffer */
-extern PNG_EXPORT(void,png_write_flush) PNGARG((png_structp png_ptr));
+PNG_EXPORT(52, void, png_write_flush, (png_structp png_ptr));
 #endif
 
-/* optional update palette with requested transformations */
-extern PNG_EXPORT(void,png_start_read_image) PNGARG((png_structp png_ptr));
+/* Optional update palette with requested transformations */
+PNG_EXPORT(53, void, png_start_read_image, (png_structp png_ptr));
 
-/* optional call to update the users info structure */
-extern PNG_EXPORT(void,png_read_update_info) PNGARG((png_structp png_ptr,
-   png_infop info_ptr));
+/* Optional call to update the users info structure */
+PNG_EXPORT(54, void, png_read_update_info,
+    (png_structp png_ptr, png_infop info_ptr));
 
-#ifndef PNG_NO_SEQUENTIAL_READ_SUPPORTED
-/* read one or more rows of image data. */
-extern PNG_EXPORT(void,png_read_rows) PNGARG((png_structp png_ptr,
-   png_bytepp row, png_bytepp display_row, png_uint_32 num_rows));
+#ifdef PNG_SEQUENTIAL_READ_SUPPORTED
+/* Read one or more rows of image data. */
+PNG_EXPORT(55, void, png_read_rows, (png_structp png_ptr, png_bytepp row,
+    png_bytepp display_row, png_uint_32 num_rows));
 #endif
 
-#ifndef PNG_NO_SEQUENTIAL_READ_SUPPORTED
-/* read a row of data. */
-extern PNG_EXPORT(void,png_read_row) PNGARG((png_structp png_ptr,
-   png_bytep row,
-   png_bytep display_row));
+#ifdef PNG_SEQUENTIAL_READ_SUPPORTED
+/* Read a row of data. */
+PNG_EXPORT(56, void, png_read_row, (png_structp png_ptr, png_bytep row,
+    png_bytep display_row));
 #endif
 
-#ifndef PNG_NO_SEQUENTIAL_READ_SUPPORTED
-/* read the whole image into memory at once. */
-extern PNG_EXPORT(void,png_read_image) PNGARG((png_structp png_ptr,
-   png_bytepp image));
+#ifdef PNG_SEQUENTIAL_READ_SUPPORTED
+/* Read the whole image into memory at once. */
+PNG_EXPORT(57, void, png_read_image, (png_structp png_ptr, png_bytepp image));
 #endif
 
-/* write a row of image data */
-extern PNG_EXPORT(void,png_write_row) PNGARG((png_structp png_ptr,
-   png_bytep row));
+/* Write a row of image data */
+PNG_EXPORT(58, void, png_write_row,
+    (png_structp png_ptr, png_const_bytep row));
 
-/* write a few rows of image data */
-extern PNG_EXPORT(void,png_write_rows) PNGARG((png_structp png_ptr,
-   png_bytepp row, png_uint_32 num_rows));
+/* Write a few rows of image data: (*row) is not written; however, the type
+ * is declared as writeable to maintain compatibility with previous versions
+ * of libpng and to allow the 'display_row' array from read_rows to be passed
+ * unchanged to write_rows.
+ */
+PNG_EXPORT(59, void, png_write_rows, (png_structp png_ptr, png_bytepp row,
+    png_uint_32 num_rows));
 
-/* write the image data */
-extern PNG_EXPORT(void,png_write_image) PNGARG((png_structp png_ptr,
-   png_bytepp image));
+/* Write the image data */
+PNG_EXPORT(60, void, png_write_image,
+    (png_structp png_ptr, png_bytepp image));
 
-/* writes the end of the PNG file. */
-extern PNG_EXPORT(void,png_write_end) PNGARG((png_structp png_ptr,
-   png_infop info_ptr));
+/* Write the end of the PNG file. */
+PNG_EXPORT(61, void, png_write_end,
+    (png_structp png_ptr, png_infop info_ptr));
 
-#ifndef PNG_NO_SEQUENTIAL_READ_SUPPORTED
-/* read the end of the PNG file. */
-extern PNG_EXPORT(void,png_read_end) PNGARG((png_structp png_ptr,
-   png_infop info_ptr));
+#ifdef PNG_SEQUENTIAL_READ_SUPPORTED
+/* Read the end of the PNG file. */
+PNG_EXPORT(62, void, png_read_end, (png_structp png_ptr, png_infop info_ptr));
 #endif
 
-/* free any memory associated with the png_info_struct */
-extern PNG_EXPORT(void,png_destroy_info_struct) PNGARG((png_structp png_ptr,
-   png_infopp info_ptr_ptr));
+/* Free any memory associated with the png_info_struct */
+PNG_EXPORT(63, void, png_destroy_info_struct, (png_structp png_ptr,
+    png_infopp info_ptr_ptr));
 
-/* free any memory associated with the png_struct and the png_info_structs */
-extern PNG_EXPORT(void,png_destroy_read_struct) PNGARG((png_structpp
-   png_ptr_ptr, png_infopp info_ptr_ptr, png_infopp end_info_ptr_ptr));
+/* Free any memory associated with the png_struct and the png_info_structs */
+PNG_EXPORT(64, void, png_destroy_read_struct, (png_structpp png_ptr_ptr,
+    png_infopp info_ptr_ptr, png_infopp end_info_ptr_ptr));
 
-/* free all memory used by the read (old method - NOT DLL EXPORTED) */
-extern void png_read_destroy PNGARG((png_structp png_ptr, png_infop info_ptr,
-   png_infop end_info_ptr));
+/* Free any memory associated with the png_struct and the png_info_structs */
+PNG_EXPORT(65, void, png_destroy_write_struct, (png_structpp png_ptr_ptr,
+    png_infopp info_ptr_ptr));
 
-/* free any memory associated with the png_struct and the png_info_structs */
-extern PNG_EXPORT(void,png_destroy_write_struct)
-   PNGARG((png_structpp png_ptr_ptr, png_infopp info_ptr_ptr));
+/* Set the libpng method of handling chunk CRC errors */
+PNG_EXPORT(66, void, png_set_crc_action,
+    (png_structp png_ptr, int crit_action, int ancil_action));
 
-/* free any memory used in png_ptr struct (old method - NOT DLL EXPORTED) */
-extern void png_write_destroy PNGARG((png_structp png_ptr));
-
-/* set the libpng method of handling chunk CRC errors */
-extern PNG_EXPORT(void,png_set_crc_action) PNGARG((png_structp png_ptr,
-   int crit_action, int ancil_action));
-
-/* Values for png_set_crc_action() to say how to handle CRC errors in
+/* Values for png_set_crc_action() say how to handle CRC errors in
  * ancillary and critical chunks, and whether to use the data contained
  * therein.  Note that it is impossible to "discard" data in a critical
  * chunk.  For versions prior to 0.90, the action was always error/quit,
@@ -1806,11 +1594,11 @@
  * header file (zlib.h) for an explination of the compression functions.
  */
 
-/* set the filtering method(s) used by libpng.  Currently, the only valid
+/* Set the filtering method(s) used by libpng.  Currently, the only valid
  * value for "method" is 0.
  */
-extern PNG_EXPORT(void,png_set_filter) PNGARG((png_structp png_ptr, int method,
-   int filters));
+PNG_EXPORT(67, void, png_set_filter,
+    (png_structp png_ptr, int method, int filters));
 
 /* Flags for png_set_filter() to say which filters to use.  The flags
  * are chosen so that they don't conflict with real filter types
@@ -1836,7 +1624,7 @@
 #define PNG_FILTER_VALUE_PAETH 4
 #define PNG_FILTER_VALUE_LAST  5
 
-#if defined(PNG_WRITE_WEIGHTED_FILTER_SUPPORTED) /* EXPERIMENTAL */
+#ifdef PNG_WRITE_WEIGHTED_FILTER_SUPPORTED /* EXPERIMENTAL */
 /* The "heuristic_method" is given by one of the PNG_FILTER_HEURISTIC_
  * defines, either the default (minimum-sum-of-absolute-differences), or
  * the experimental method (weighted-minimum-sum-of-absolute-differences).
@@ -1865,11 +1653,13 @@
  * the weights and costs are set to 1.0, this degenerates the WEIGHTED method
  * to the UNWEIGHTED method, but with added encoding time/computation.
  */
-#ifdef PNG_FLOATING_POINT_SUPPORTED
-extern PNG_EXPORT(void,png_set_filter_heuristics) PNGARG((png_structp png_ptr,
-   int heuristic_method, int num_weights, png_doublep filter_weights,
-   png_doublep filter_costs));
-#endif
+PNG_FP_EXPORT(68, void, png_set_filter_heuristics, (png_structp png_ptr,
+    int heuristic_method, int num_weights, png_const_doublep filter_weights,
+    png_const_doublep filter_costs));
+PNG_FIXED_EXPORT(209, void, png_set_filter_heuristics_fixed,
+    (png_structp png_ptr,
+    int heuristic_method, int num_weights, png_const_fixed_point_p
+    filter_weights, png_const_fixed_point_p filter_costs));
 #endif /*  PNG_WRITE_WEIGHTED_FILTER_SUPPORTED */
 
 /* Heuristic used for row filter selection.  These defines should NOT be
@@ -1880,6 +1670,7 @@
 #define PNG_FILTER_HEURISTIC_WEIGHTED   2  /* Experimental feature */
 #define PNG_FILTER_HEURISTIC_LAST       3  /* Not a valid value */
 
+#ifdef PNG_WRITE_SUPPORTED
 /* Set the library compression level.  Currently, valid values range from
  * 0 - 9, corresponding directly to the zlib compression levels 0 - 9
  * (0 - no compression, 9 - "maximal" compression).  Note that tests have
@@ -1887,33 +1678,58 @@
  * for PNG images, and do considerably fewer caclulations.  In the future,
  * these values may not correspond directly to the zlib compression levels.
  */
-extern PNG_EXPORT(void,png_set_compression_level) PNGARG((png_structp png_ptr,
-   int level));
+PNG_EXPORT(69, void, png_set_compression_level,
+    (png_structp png_ptr, int level));
 
-extern PNG_EXPORT(void,png_set_compression_mem_level)
-   PNGARG((png_structp png_ptr, int mem_level));
+PNG_EXPORT(70, void, png_set_compression_mem_level, (png_structp png_ptr,
+    int mem_level));
 
-extern PNG_EXPORT(void,png_set_compression_strategy)
-   PNGARG((png_structp png_ptr, int strategy));
+PNG_EXPORT(71, void, png_set_compression_strategy, (png_structp png_ptr,
+    int strategy));
 
-extern PNG_EXPORT(void,png_set_compression_window_bits)
-   PNGARG((png_structp png_ptr, int window_bits));
+/* If PNG_WRITE_OPTIMIZE_CMF_SUPPORTED is defined, libpng will use a
+ * smaller value of window_bits if it can do so safely.
+ */
+PNG_EXPORT(72, void, png_set_compression_window_bits, (png_structp png_ptr,
+    int window_bits));
 
-extern PNG_EXPORT(void,png_set_compression_method) PNGARG((png_structp png_ptr,
-   int method));
+PNG_EXPORT(73, void, png_set_compression_method, (png_structp png_ptr,
+    int method));
+#endif
+
+#ifdef PNG_WRITE_CUSTOMIZE_ZTXT_COMPRESSION_SUPPORTED
+/* Also set zlib parameters for compressing non-IDAT chunks */
+PNG_EXPORT(222, void, png_set_text_compression_level,
+    (png_structp png_ptr, int level));
+
+PNG_EXPORT(223, void, png_set_text_compression_mem_level, (png_structp png_ptr,
+    int mem_level));
+
+PNG_EXPORT(224, void, png_set_text_compression_strategy, (png_structp png_ptr,
+    int strategy));
+
+/* If PNG_WRITE_OPTIMIZE_CMF_SUPPORTED is defined, libpng will use a
+ * smaller value of window_bits if it can do so safely.
+ */
+PNG_EXPORT(225, void, png_set_text_compression_window_bits, (png_structp
+    png_ptr, int window_bits));
+
+PNG_EXPORT(226, void, png_set_text_compression_method, (png_structp png_ptr,
+    int method));
+#endif /* PNG_WRITE_CUSTOMIZE_ZTXT_COMPRESSION_SUPPORTED */
 
 /* These next functions are called for input/output, memory, and error
  * handling.  They are in the file pngrio.c, pngwio.c, and pngerror.c,
  * and call standard C I/O routines such as fread(), fwrite(), and
  * fprintf().  These functions can be made to use other I/O routines
  * at run time for those applications that need to handle I/O in a
- * different manner by calling png_set_???_fn().  See libpng.txt for
+ * different manner by calling png_set_???_fn().  See libpng-manual.txt for
  * more information.
  */
 
-#if !defined(PNG_NO_STDIO)
+#ifdef PNG_STDIO_SUPPORTED
 /* Initialize the input/output for the PNG file to the default functions. */
-extern PNG_EXPORT(void,png_init_io) PNGARG((png_structp png_ptr, png_FILE_p fp));
+PNG_EXPORT(74, void, png_init_io, (png_structp png_ptr, png_FILE_p fp));
 #endif
 
 /* Replace the (error and abort), and warning functions with user
@@ -1924,128 +1740,155 @@
  * default function will be used.
  */
 
-extern PNG_EXPORT(void,png_set_error_fn) PNGARG((png_structp png_ptr,
-   png_voidp error_ptr, png_error_ptr error_fn, png_error_ptr warning_fn));
+PNG_EXPORT(75, void, png_set_error_fn,
+    (png_structp png_ptr, png_voidp error_ptr,
+    png_error_ptr error_fn, png_error_ptr warning_fn));
 
 /* Return the user pointer associated with the error functions */
-extern PNG_EXPORT(png_voidp,png_get_error_ptr) PNGARG((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.
  * If PNG_WRITE_FLUSH_SUPPORTED is not defined at libpng compile time
  * output_flush_fn will be ignored (and thus can be NULL).
+ * It is probably a mistake to use NULL for output_flush_fn if
+ * write_data_fn is not also NULL unless you have built libpng with
+ * PNG_WRITE_FLUSH_SUPPORTED undefined, because in this case libpng's
+ * default flush function, which uses the standard *FILE structure, will
+ * be used.
  */
-extern PNG_EXPORT(void,png_set_write_fn) PNGARG((png_structp png_ptr,
-   png_voidp io_ptr, png_rw_ptr write_data_fn, png_flush_ptr output_flush_fn));
+PNG_EXPORT(77, void, png_set_write_fn, (png_structp png_ptr, png_voidp io_ptr,
+    png_rw_ptr write_data_fn, png_flush_ptr output_flush_fn));
 
 /* Replace the default data input function with a user supplied one. */
-extern PNG_EXPORT(void,png_set_read_fn) PNGARG((png_structp png_ptr,
-   png_voidp io_ptr, png_rw_ptr read_data_fn));
+PNG_EXPORT(78, void, png_set_read_fn, (png_structp png_ptr, png_voidp io_ptr,
+    png_rw_ptr read_data_fn));
 
 /* Return the user pointer associated with the I/O functions */
-extern PNG_EXPORT(png_voidp,png_get_io_ptr) PNGARG((png_structp png_ptr));
+PNG_EXPORT(79, png_voidp, png_get_io_ptr, (png_structp png_ptr));
 
-extern PNG_EXPORT(void,png_set_read_status_fn) PNGARG((png_structp png_ptr,
-   png_read_status_ptr read_row_fn));
+PNG_EXPORT(80, void, png_set_read_status_fn, (png_structp png_ptr,
+    png_read_status_ptr read_row_fn));
 
-extern PNG_EXPORT(void,png_set_write_status_fn) PNGARG((png_structp png_ptr,
-   png_write_status_ptr write_row_fn));
+PNG_EXPORT(81, void, png_set_write_status_fn, (png_structp png_ptr,
+    png_write_status_ptr write_row_fn));
 
 #ifdef PNG_USER_MEM_SUPPORTED
 /* Replace the default memory allocation functions with user supplied one(s). */
-extern PNG_EXPORT(void,png_set_mem_fn) PNGARG((png_structp png_ptr,
-   png_voidp mem_ptr, png_malloc_ptr malloc_fn, png_free_ptr free_fn));
+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 */
-extern PNG_EXPORT(png_voidp,png_get_mem_ptr) PNGARG((png_structp png_ptr));
+PNG_EXPORT(83, png_voidp, png_get_mem_ptr, (png_const_structp png_ptr));
 #endif
 
-#if defined(PNG_READ_USER_TRANSFORM_SUPPORTED) || \
-    defined(PNG_LEGACY_SUPPORTED)
-extern PNG_EXPORT(void,png_set_read_user_transform_fn) PNGARG((png_structp
-   png_ptr, png_user_transform_ptr read_user_transform_fn));
+#ifdef PNG_READ_USER_TRANSFORM_SUPPORTED
+PNG_EXPORT(84, void, png_set_read_user_transform_fn, (png_structp png_ptr,
+    png_user_transform_ptr read_user_transform_fn));
 #endif
 
-#if defined(PNG_WRITE_USER_TRANSFORM_SUPPORTED) || \
-    defined(PNG_LEGACY_SUPPORTED)
-extern PNG_EXPORT(void,png_set_write_user_transform_fn) PNGARG((png_structp
-   png_ptr, png_user_transform_ptr write_user_transform_fn));
+#ifdef PNG_WRITE_USER_TRANSFORM_SUPPORTED
+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) || \
-    defined(PNG_LEGACY_SUPPORTED)
-extern PNG_EXPORT(void,png_set_user_transform_info) PNGARG((png_structp
-   png_ptr, png_voidp user_transform_ptr, int user_transform_depth,
-   int user_transform_channels));
+#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 */
-extern PNG_EXPORT(png_voidp,png_get_user_transform_ptr)
-   PNGARG((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 the row number within the sub-image of the interlace pass, so
+ * the value will increase to the height of the sub-image (not the full image)
+ * then reset to 0 for the next pass.
+ *
+ * Use PNG_ROW_FROM_PASS_ROW(row, pass) and PNG_COL_FROM_PASS_COL(col, pass) to
+ * find the output pixel (x,y) given an interlaced sub-image pixel
+ * (row,col,pass).  (See below for these macros.)
+ */
+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
-extern PNG_EXPORT(void,png_set_read_user_chunk_fn) PNGARG((png_structp png_ptr,
-   png_voidp user_chunk_ptr, png_user_chunk_ptr read_user_chunk_fn));
-extern PNG_EXPORT(png_voidp,png_get_user_chunk_ptr) PNGARG((png_structp
-   png_ptr));
+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_const_structp png_ptr));
 #endif
 
 #ifdef PNG_PROGRESSIVE_READ_SUPPORTED
 /* Sets the function callbacks for the push reader, and a pointer to a
  * user-defined structure available to the callback functions.
  */
-extern PNG_EXPORT(void,png_set_progressive_read_fn) PNGARG((png_structp png_ptr,
-   png_voidp progressive_ptr,
-   png_progressive_info_ptr info_fn, png_progressive_row_ptr row_fn,
-   png_progressive_end_ptr end_fn));
+PNG_EXPORT(90, void, png_set_progressive_read_fn, (png_structp png_ptr,
+    png_voidp progressive_ptr, png_progressive_info_ptr info_fn,
+    png_progressive_row_ptr row_fn, png_progressive_end_ptr end_fn));
 
-/* returns the user pointer associated with the push read functions */
-extern PNG_EXPORT(png_voidp,png_get_progressive_ptr)
-   PNGARG((png_structp png_ptr));
+/* Returns the user pointer associated with the push read functions */
+PNG_EXPORT(91, png_voidp, png_get_progressive_ptr, (png_const_structp png_ptr));
 
-/* function to be called when data becomes available */
-extern PNG_EXPORT(void,png_process_data) PNGARG((png_structp png_ptr,
-   png_infop info_ptr, png_bytep buffer, png_size_t buffer_size));
+/* 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));
 
-/* function that combines rows.  Not very much different than the
- * png_combine_row() call.  Is this even used?????
+/* 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.
  */
-extern PNG_EXPORT(void,png_progressive_combine_row) PNGARG((png_structp png_ptr,
-   png_bytep old_row, png_bytep new_row));
+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
+ * in value.
+ */
+PNG_EXPORT(93, void, png_progressive_combine_row, (png_structp png_ptr,
+    png_bytep old_row, png_const_bytep new_row));
 #endif /* PNG_PROGRESSIVE_READ_SUPPORTED */
 
-extern PNG_EXPORT(png_voidp,png_malloc) PNGARG((png_structp png_ptr,
-   png_uint_32 size));
+PNG_EXPORTA(94, png_voidp, png_malloc,
+    (png_structp png_ptr, png_alloc_size_t size),
+    PNG_ALLOCATED);
+/* Added at libpng version 1.4.0 */
+PNG_EXPORTA(95, png_voidp, png_calloc,
+    (png_structp png_ptr, png_alloc_size_t size),
+    PNG_ALLOCATED);
 
-#if defined(PNG_1_0_X)
-#  define png_malloc_warn png_malloc
-#else
 /* Added at libpng version 1.2.4 */
-extern PNG_EXPORT(png_voidp,png_malloc_warn) PNGARG((png_structp png_ptr,
-   png_uint_32 size));
-#endif
+PNG_EXPORTA(96, png_voidp, png_malloc_warn, (png_structp png_ptr,
+    png_alloc_size_t size), PNG_ALLOCATED);
 
-/* frees a pointer allocated by png_malloc() */
-extern PNG_EXPORT(void,png_free) PNGARG((png_structp png_ptr, png_voidp ptr));
-
-#if defined(PNG_1_0_X)
-/* Function to allocate memory for zlib. */
-extern PNG_EXPORT(voidpf,png_zalloc) PNGARG((voidpf png_ptr, uInt items,
-   uInt size));
-
-/* Function to free memory for zlib */
-extern PNG_EXPORT(void,png_zfree) PNGARG((voidpf png_ptr, voidpf ptr));
-#endif
+/* Frees a pointer allocated by png_malloc() */
+PNG_EXPORT(97, void, png_free, (png_structp png_ptr, png_voidp ptr));
 
 /* Free data that was allocated internally */
-extern PNG_EXPORT(void,png_free_data) PNGARG((png_structp png_ptr,
-   png_infop info_ptr, png_uint_32 free_me, int num));
-#ifdef PNG_FREE_ME_SUPPORTED
+PNG_EXPORT(98, void, png_free_data,
+    (png_structp png_ptr, png_infop info_ptr, png_uint_32 free_me, int num));
+
 /* Reassign responsibility for freeing existing data, whether allocated
  * by libpng or by the application */
-extern PNG_EXPORT(void,png_data_freer) PNGARG((png_structp png_ptr,
-   png_infop info_ptr, int freer, png_uint_32 mask));
-#endif
-/* assignments for png_data_freer */
+PNG_EXPORT(99, void, png_data_freer,
+    (png_structp png_ptr, png_infop info_ptr, int freer, png_uint_32 mask));
+
+/* Assignments for png_data_freer */
 #define PNG_DESTROY_WILL_FREE_DATA 1
 #define PNG_SET_WILL_FREE_DATA 1
 #define PNG_USER_WILL_FREE_DATA 2
@@ -2065,38 +1908,59 @@
 #define PNG_FREE_MUL  0x4220 /* PNG_FREE_SPLT|PNG_FREE_TEXT|PNG_FREE_UNKN */
 
 #ifdef PNG_USER_MEM_SUPPORTED
-extern PNG_EXPORT(png_voidp,png_malloc_default) PNGARG((png_structp png_ptr,
-   png_uint_32 size));
-extern PNG_EXPORT(void,png_free_default) PNGARG((png_structp png_ptr,
-   png_voidp ptr));
+PNG_EXPORTA(100, png_voidp, png_malloc_default, (png_structp png_ptr,
+    png_alloc_size_t size), PNG_ALLOCATED);
+PNG_EXPORT(101, void, png_free_default, (png_structp png_ptr, png_voidp ptr));
 #endif
 
-extern PNG_EXPORT(png_voidp,png_memcpy_check) PNGARG((png_structp png_ptr,
-   png_voidp s1, png_voidp s2, png_uint_32 size));
-
-extern PNG_EXPORT(png_voidp,png_memset_check) PNGARG((png_structp png_ptr,
-   png_voidp s1, int value, png_uint_32 size));
-
-#if defined(USE_FAR_KEYWORD)  /* memory model conversion function */
-extern void *png_far_to_near PNGARG((png_structp png_ptr,png_voidp ptr,
-   int check));
-#endif /* USE_FAR_KEYWORD */
-
+#ifdef PNG_ERROR_TEXT_SUPPORTED
 /* Fatal error in PNG image of libpng - can't continue */
-extern PNG_EXPORT(void,png_error) PNGARG((png_structp png_ptr,
-   png_const_charp error_message));
+PNG_EXPORTA(102, void, png_error,
+    (png_structp png_ptr, png_const_charp error_message),
+    PNG_NORETURN);
 
 /* The same, but the chunk name is prepended to the error string. */
-extern PNG_EXPORT(void,png_chunk_error) PNGARG((png_structp png_ptr,
-   png_const_charp error_message));
+PNG_EXPORTA(103, void, png_chunk_error, (png_structp png_ptr,
+    png_const_charp error_message), PNG_NORETURN);
 
+#else
+/* Fatal error in PNG image of libpng - can't continue */
+PNG_EXPORTA(104, void, png_err, (png_structp png_ptr), PNG_NORETURN);
+#endif
+
+#ifdef PNG_WARNINGS_SUPPORTED
 /* Non-fatal error in libpng.  Can continue, but may have a problem. */
-extern PNG_EXPORT(void,png_warning) PNGARG((png_structp png_ptr,
-   png_const_charp warning_message));
+PNG_EXPORT(105, void, png_warning, (png_structp png_ptr,
+    png_const_charp warning_message));
 
 /* Non-fatal error in libpng, chunk name is prepended to message. */
-extern PNG_EXPORT(void,png_chunk_warning) PNGARG((png_structp png_ptr,
-   png_const_charp warning_message));
+PNG_EXPORT(106, void, png_chunk_warning, (png_structp png_ptr,
+    png_const_charp warning_message));
+#endif
+
+#ifdef PNG_BENIGN_ERRORS_SUPPORTED
+/* Benign error in libpng.  Can continue, but may have a problem.
+ * User can choose whether to handle as a fatal error or as a warning. */
+#  undef png_benign_error
+PNG_EXPORT(107, void, png_benign_error, (png_structp png_ptr,
+    png_const_charp warning_message));
+
+/* Same, chunk name is prepended to message. */
+#  undef png_chunk_benign_error
+PNG_EXPORT(108, void, png_chunk_benign_error, (png_structp png_ptr,
+    png_const_charp warning_message));
+
+PNG_EXPORT(109, void, png_set_benign_errors,
+    (png_structp png_ptr, int allowed));
+#else
+#  ifdef PNG_ALLOW_BENIGN_ERRORS
+#    define png_benign_error png_warning
+#    define png_chunk_benign_error png_chunk_warning
+#  else
+#    define png_benign_error png_error
+#    define png_chunk_benign_error png_chunk_error
+#  endif
+#endif
 
 /* The png_set_<chunk> functions are for storing values in the png_info_struct.
  * Similarly, the png_get_<chunk> calls are used to read values from the
@@ -2111,322 +1975,338 @@
  * png_info_struct.
  */
 /* Returns "flag" if chunk data is valid in info_ptr. */
-extern PNG_EXPORT(png_uint_32,png_get_valid) PNGARG((png_structp png_ptr,
-png_infop info_ptr, png_uint_32 flag));
+PNG_EXPORT(110, png_uint_32, png_get_valid,
+    (png_const_structp png_ptr, png_const_infop info_ptr,
+    png_uint_32 flag));
 
 /* Returns number of bytes needed to hold a transformed row. */
-extern PNG_EXPORT(png_uint_32,png_get_rowbytes) PNGARG((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));
 
-#if defined(PNG_INFO_IMAGE_SUPPORTED)
+#ifdef PNG_INFO_IMAGE_SUPPORTED
 /* Returns row_pointers, which is an array of pointers to scanlines that was
-returned from png_read_png(). */
-extern PNG_EXPORT(png_bytepp,png_get_rows) PNGARG((png_structp png_ptr,
-png_infop info_ptr));
+ * returned from png_read_png().
+ */
+PNG_EXPORT(112, png_bytepp, png_get_rows,
+    (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(). */
-extern PNG_EXPORT(void,png_set_rows) PNGARG((png_structp png_ptr,
-   png_infop info_ptr, png_bytepp row_pointers));
+ * by png_write_png().
+ */
+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. */
-extern PNG_EXPORT(png_byte,png_get_channels) PNGARG((png_structp png_ptr,
-png_infop info_ptr));
+PNG_EXPORT(114, png_byte, png_get_channels,
+    (png_const_structp png_ptr, png_const_infop info_ptr));
 
 #ifdef PNG_EASY_ACCESS_SUPPORTED
 /* Returns image width in pixels. */
-extern PNG_EXPORT(png_uint_32, png_get_image_width) PNGARG((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. */
-extern PNG_EXPORT(png_uint_32, png_get_image_height) PNGARG((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. */
-extern PNG_EXPORT(png_byte, png_get_bit_depth) PNGARG((png_structp
-png_ptr, png_infop info_ptr));
+PNG_EXPORT(117, png_byte, png_get_bit_depth,
+    (png_const_structp png_ptr, png_const_infop info_ptr));
 
 /* Returns image color_type. */
-extern PNG_EXPORT(png_byte, png_get_color_type) PNGARG((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. */
-extern PNG_EXPORT(png_byte, png_get_filter_type) PNGARG((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. */
-extern PNG_EXPORT(png_byte, png_get_interlace_type) PNGARG((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. */
-extern PNG_EXPORT(png_byte, png_get_compression_type) PNGARG((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. */
-extern PNG_EXPORT(png_uint_32, png_get_pixels_per_meter) PNGARG((png_structp
-png_ptr, png_infop info_ptr));
-extern PNG_EXPORT(png_uint_32, png_get_x_pixels_per_meter) PNGARG((png_structp
-png_ptr, png_infop info_ptr));
-extern PNG_EXPORT(png_uint_32, png_get_y_pixels_per_meter) PNGARG((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.  */
-#ifdef PNG_FLOATING_POINT_SUPPORTED
-extern PNG_EXPORT(float, png_get_pixel_aspect_ratio) PNGARG((png_structp
-png_ptr, png_infop info_ptr));
-#endif
+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_const_structp png_ptr, png_const_infop info_ptr));
 
 /* Returns image x, y offset in pixels or microns, from oFFs chunk data. */
-extern PNG_EXPORT(png_int_32, png_get_x_offset_pixels) PNGARG((png_structp
-png_ptr, png_infop info_ptr));
-extern PNG_EXPORT(png_int_32, png_get_y_offset_pixels) PNGARG((png_structp
-png_ptr, png_infop info_ptr));
-extern PNG_EXPORT(png_int_32, png_get_x_offset_microns) PNGARG((png_structp
-png_ptr, png_infop info_ptr));
-extern PNG_EXPORT(png_int_32, png_get_y_offset_microns) PNGARG((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 */
-extern PNG_EXPORT(png_bytep,png_get_signature) PNGARG((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));
 
-#if defined(PNG_bKGD_SUPPORTED)
-extern PNG_EXPORT(png_uint_32,png_get_bKGD) PNGARG((png_structp png_ptr,
-   png_infop info_ptr, png_color_16p *background));
+#ifdef PNG_bKGD_SUPPORTED
+PNG_EXPORT(131, png_uint_32, png_get_bKGD,
+    (png_const_structp png_ptr, png_infop info_ptr,
+    png_color_16p *background));
 #endif
 
-#if defined(PNG_bKGD_SUPPORTED)
-extern PNG_EXPORT(void,png_set_bKGD) PNGARG((png_structp png_ptr,
-   png_infop info_ptr, png_color_16p background));
+#ifdef PNG_bKGD_SUPPORTED
+PNG_EXPORT(132, void, png_set_bKGD, (png_structp png_ptr, png_infop info_ptr,
+    png_const_color_16p background));
 #endif
 
-#if defined(PNG_cHRM_SUPPORTED)
-#ifdef PNG_FLOATING_POINT_SUPPORTED
-extern PNG_EXPORT(png_uint_32,png_get_cHRM) PNGARG((png_structp png_ptr,
-   png_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));
-#endif
-#ifdef PNG_FIXED_POINT_SUPPORTED
-extern PNG_EXPORT(png_uint_32,png_get_cHRM_fixed) PNGARG((png_structp png_ptr,
-   png_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, png_fixed_point *int_blue_y));
+#ifdef PNG_cHRM_SUPPORTED
+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_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,
+    png_fixed_point *int_blue_y));
 #endif
 #endif
 
-#if defined(PNG_cHRM_SUPPORTED)
-#ifdef PNG_FLOATING_POINT_SUPPORTED
-extern PNG_EXPORT(void,png_set_cHRM) PNGARG((png_structp png_ptr,
-   png_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));
-#endif
-#ifdef PNG_FIXED_POINT_SUPPORTED
-extern PNG_EXPORT(void,png_set_cHRM_fixed) PNGARG((png_structp png_ptr,
-   png_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,
-   png_fixed_point int_blue_y));
-#endif
+#ifdef PNG_cHRM_SUPPORTED
+PNG_FP_EXPORT(135, void, png_set_cHRM,
+    (png_structp png_ptr, png_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));
+PNG_FIXED_EXPORT(136, void, png_set_cHRM_fixed, (png_structp png_ptr,
+    png_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,
+    png_fixed_point int_blue_y));
 #endif
 
-#if defined(PNG_gAMA_SUPPORTED)
-#ifdef PNG_FLOATING_POINT_SUPPORTED
-extern PNG_EXPORT(png_uint_32,png_get_gAMA) PNGARG((png_structp png_ptr,
-   png_infop info_ptr, double *file_gamma));
-#endif
-extern PNG_EXPORT(png_uint_32,png_get_gAMA_fixed) PNGARG((png_structp png_ptr,
-   png_infop info_ptr, png_fixed_point *int_file_gamma));
+#ifdef PNG_gAMA_SUPPORTED
+PNG_FP_EXPORT(137, png_uint_32, png_get_gAMA,
+    (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_const_structp png_ptr, png_const_infop info_ptr,
+    png_fixed_point *int_file_gamma));
 #endif
 
-#if defined(PNG_gAMA_SUPPORTED)
-#ifdef PNG_FLOATING_POINT_SUPPORTED
-extern PNG_EXPORT(void,png_set_gAMA) PNGARG((png_structp png_ptr,
-   png_infop info_ptr, double file_gamma));
-#endif
-extern PNG_EXPORT(void,png_set_gAMA_fixed) PNGARG((png_structp png_ptr,
-   png_infop info_ptr, png_fixed_point int_file_gamma));
+#ifdef PNG_gAMA_SUPPORTED
+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
 
-#if defined(PNG_hIST_SUPPORTED)
-extern PNG_EXPORT(png_uint_32,png_get_hIST) PNGARG((png_structp png_ptr,
-   png_infop info_ptr, png_uint_16p *hist));
+#ifdef PNG_hIST_SUPPORTED
+PNG_EXPORT(141, png_uint_32, png_get_hIST,
+    (png_const_structp png_ptr, png_const_infop info_ptr,
+    png_uint_16p *hist));
 #endif
 
-#if defined(PNG_hIST_SUPPORTED)
-extern PNG_EXPORT(void,png_set_hIST) PNGARG((png_structp png_ptr,
-   png_infop info_ptr, png_uint_16p hist));
+#ifdef PNG_hIST_SUPPORTED
+PNG_EXPORT(142, void, png_set_hIST, (png_structp png_ptr,
+    png_infop info_ptr, png_const_uint_16p hist));
 #endif
 
-extern PNG_EXPORT(png_uint_32,png_get_IHDR) PNGARG((png_structp png_ptr,
-   png_infop info_ptr, png_uint_32 *width, png_uint_32 *height,
-   int *bit_depth, int *color_type, int *interlace_method,
-   int *compression_method, int *filter_method));
+PNG_EXPORT(143, png_uint_32, png_get_IHDR,
+    (png_structp png_ptr, png_infop info_ptr,
+    png_uint_32 *width, png_uint_32 *height, int *bit_depth, int *color_type,
+    int *interlace_method, int *compression_method, int *filter_method));
 
-extern PNG_EXPORT(void,png_set_IHDR) PNGARG((png_structp png_ptr,
-   png_infop info_ptr, png_uint_32 width, png_uint_32 height, int bit_depth,
-   int color_type, int interlace_method, int compression_method,
-   int filter_method));
+PNG_EXPORT(144, void, png_set_IHDR,
+    (png_structp png_ptr, png_infop info_ptr,
+    png_uint_32 width, png_uint_32 height, int bit_depth, int color_type,
+    int interlace_method, int compression_method, int filter_method));
 
-#if defined(PNG_oFFs_SUPPORTED)
-extern PNG_EXPORT(png_uint_32,png_get_oFFs) PNGARG((png_structp png_ptr,
-   png_infop info_ptr, png_int_32 *offset_x, png_int_32 *offset_y,
-   int *unit_type));
+#ifdef PNG_oFFs_SUPPORTED
+PNG_EXPORT(145, png_uint_32, 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));
 #endif
 
-#if defined(PNG_oFFs_SUPPORTED)
-extern PNG_EXPORT(void,png_set_oFFs) PNGARG((png_structp png_ptr,
-   png_infop info_ptr, png_int_32 offset_x, png_int_32 offset_y,
-   int unit_type));
+#ifdef PNG_oFFs_SUPPORTED
+PNG_EXPORT(146, void, png_set_oFFs,
+    (png_structp png_ptr, png_infop info_ptr,
+    png_int_32 offset_x, png_int_32 offset_y, int unit_type));
 #endif
 
-#if defined(PNG_pCAL_SUPPORTED)
-extern PNG_EXPORT(png_uint_32,png_get_pCAL) PNGARG((png_structp png_ptr,
-   png_infop info_ptr, png_charp *purpose, png_int_32 *X0, png_int_32 *X1,
-   int *type, int *nparams, png_charp *units, png_charpp *params));
+#ifdef PNG_pCAL_SUPPORTED
+PNG_EXPORT(147, png_uint_32, 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));
 #endif
 
-#if defined(PNG_pCAL_SUPPORTED)
-extern PNG_EXPORT(void,png_set_pCAL) PNGARG((png_structp png_ptr,
-   png_infop info_ptr, png_charp purpose, png_int_32 X0, png_int_32 X1,
-   int type, int nparams, png_charp units, png_charpp params));
+#ifdef PNG_pCAL_SUPPORTED
+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
 
-#if defined(PNG_pHYs_SUPPORTED)
-extern PNG_EXPORT(png_uint_32,png_get_pHYs) PNGARG((png_structp png_ptr,
-   png_infop info_ptr, png_uint_32 *res_x, png_uint_32 *res_y, int *unit_type));
+#ifdef PNG_pHYs_SUPPORTED
+PNG_EXPORT(149, png_uint_32, 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));
 #endif
 
-#if defined(PNG_pHYs_SUPPORTED)
-extern PNG_EXPORT(void,png_set_pHYs) PNGARG((png_structp png_ptr,
-   png_infop info_ptr, png_uint_32 res_x, png_uint_32 res_y, int unit_type));
+#ifdef PNG_pHYs_SUPPORTED
+PNG_EXPORT(150, void, png_set_pHYs,
+    (png_structp png_ptr, png_infop info_ptr,
+    png_uint_32 res_x, png_uint_32 res_y, int unit_type));
 #endif
 
-extern PNG_EXPORT(png_uint_32,png_get_PLTE) PNGARG((png_structp png_ptr,
-   png_infop info_ptr, png_colorp *palette, int *num_palette));
+PNG_EXPORT(151, png_uint_32, png_get_PLTE,
+    (png_const_structp png_ptr, png_const_infop info_ptr,
+    png_colorp *palette, int *num_palette));
 
-extern PNG_EXPORT(void,png_set_PLTE) PNGARG((png_structp png_ptr,
-   png_infop info_ptr, png_colorp palette, int num_palette));
+PNG_EXPORT(152, void, png_set_PLTE,
+    (png_structp png_ptr, png_infop info_ptr,
+    png_const_colorp palette, int num_palette));
 
-#if defined(PNG_sBIT_SUPPORTED)
-extern PNG_EXPORT(png_uint_32,png_get_sBIT) PNGARG((png_structp png_ptr,
-   png_infop info_ptr, png_color_8p *sig_bit));
+#ifdef PNG_sBIT_SUPPORTED
+PNG_EXPORT(153, png_uint_32, png_get_sBIT,
+    (png_const_structp png_ptr, png_infop info_ptr,
+    png_color_8p *sig_bit));
 #endif
 
-#if defined(PNG_sBIT_SUPPORTED)
-extern PNG_EXPORT(void,png_set_sBIT) PNGARG((png_structp png_ptr,
-   png_infop info_ptr, png_color_8p sig_bit));
+#ifdef PNG_sBIT_SUPPORTED
+PNG_EXPORT(154, void, png_set_sBIT,
+    (png_structp png_ptr, png_infop info_ptr, png_const_color_8p sig_bit));
 #endif
 
-#if defined(PNG_sRGB_SUPPORTED)
-extern PNG_EXPORT(png_uint_32,png_get_sRGB) PNGARG((png_structp png_ptr,
-   png_infop info_ptr, int *intent));
+#ifdef PNG_sRGB_SUPPORTED
+PNG_EXPORT(155, png_uint_32, png_get_sRGB, (png_const_structp png_ptr,
+    png_const_infop info_ptr, int *file_srgb_intent));
 #endif
 
-#if defined(PNG_sRGB_SUPPORTED)
-extern PNG_EXPORT(void,png_set_sRGB) PNGARG((png_structp png_ptr,
-   png_infop info_ptr, int intent));
-extern PNG_EXPORT(void,png_set_sRGB_gAMA_and_cHRM) PNGARG((png_structp png_ptr,
-   png_infop info_ptr, int intent));
+#ifdef PNG_sRGB_SUPPORTED
+PNG_EXPORT(156, void, png_set_sRGB,
+    (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 srgb_intent));
 #endif
 
-#if defined(PNG_iCCP_SUPPORTED)
-extern PNG_EXPORT(png_uint_32,png_get_iCCP) PNGARG((png_structp png_ptr,
-   png_infop info_ptr, png_charpp name, int *compression_type,
-   png_charpp profile, png_uint_32 *proflen));
-   /* Note to maintainer: profile should be png_bytepp */
+#ifdef PNG_iCCP_SUPPORTED
+PNG_EXPORT(158, png_uint_32, 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));
 #endif
 
-#if defined(PNG_iCCP_SUPPORTED)
-extern PNG_EXPORT(void,png_set_iCCP) PNGARG((png_structp png_ptr,
-   png_infop info_ptr, png_charp name, int compression_type,
-   png_charp profile, png_uint_32 proflen));
-   /* Note to maintainer: profile should be png_bytep */
+#ifdef PNG_iCCP_SUPPORTED
+PNG_EXPORT(159, void, png_set_iCCP,
+    (png_structp png_ptr, png_infop info_ptr,
+    png_const_charp name, int compression_type, png_const_bytep profile,
+    png_uint_32 proflen));
 #endif
 
-#if defined(PNG_sPLT_SUPPORTED)
-extern PNG_EXPORT(png_uint_32