From 3489e853a11ff4b60a44351e00dbb31ca04b8d02 Mon Sep 17 00:00:00 2001
From: dborth <dborth@d154fe42-be53-0410-aac0-356034171556>
Date: Thu, 14 Aug 2008 06:08:03 +0000
Subject: [PATCH]

---
 source/libpng/png.h       | 3569 -------------------------------------
 source/libpng/pngconf.h   | 1481 ---------------
 source/libpng/pngu/pngu.c | 1132 ------------
 source/libpng/pngu/pngu.h |  171 --
 4 files changed, 6353 deletions(-)
 delete mode 100644 source/libpng/png.h
 delete mode 100644 source/libpng/pngconf.h
 delete mode 100644 source/libpng/pngu/pngu.c
 delete mode 100644 source/libpng/pngu/pngu.h

diff --git a/source/libpng/png.h b/source/libpng/png.h
deleted file mode 100644
index e0cec0c..0000000
--- a/source/libpng/png.h
+++ /dev/null
@@ -1,3569 +0,0 @@
-/* png.h - header file for PNG reference library
- *
- * libpng version 1.2.29 - May 8, 2008
- * Copyright (c) 1998-2008 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.)
- *
- * 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 1.2.29 - May 8, 2008: 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:
- *
- *    source                 png.h  png.h  shared-lib
- *    version                string   int  version
- *    -------                ------ -----  ----------
- *    0.89c "1.0 beta 3"     0.89      89  1.0.89
- *    0.90  "1.0 beta 4"     0.90      90  0.90  [should have been 2.0.90]
- *    0.95  "1.0 beta 5"     0.95      95  0.95  [should have been 2.0.95]
- *    0.96  "1.0 beta 6"     0.96      96  0.96  [should have been 2.0.96]
- *    0.97b "1.00.97 beta 7" 1.00.97   97  1.0.1 [should have been 2.0.97]
- *    0.97c                  0.97      97  2.0.97
- *    0.98                   0.98      98  2.0.98
- *    0.99                   0.99      98  2.0.99
- *    0.99a-m                0.99      99  2.0.99
- *    1.00                   1.00     100  2.1.0 [100 should be 10000]
- *    1.0.0      (from here on, the   100  2.1.0 [100 should be 10000]
- *    1.0.1       png.h string is   10001  2.1.0
- *    1.0.1a-e    identical to the  10002  from here on, the shared library
- *    1.0.2       source version)   10002  is 2.V where V is the source code
- *    1.0.2a-b                      10003  version, except as noted.
- *    1.0.3                         10003
- *    1.0.3a-d                      10004
- *    1.0.4                         10004
- *    1.0.4a-f                      10005
- *    1.0.5 (+ 2 patches)           10005
- *    1.0.5a-d                      10006
- *    1.0.5e-r                      10100 (not source compatible)
- *    1.0.5s-v                      10006 (not binary compatible)
- *    1.0.6 (+ 3 patches)           10006 (still binary incompatible)
- *    1.0.6d-f                      10007 (still binary incompatible)
- *    1.0.6g                        10007
- *    1.0.6h                        10007  10.6h (testing xy.z so-numbering)
- *    1.0.6i                        10007  10.6i
- *    1.0.6j                        10007  2.1.0.6j (incompatible with 1.0.0)
- *    1.0.7beta11-14        DLLNUM  10007  2.1.0.7beta11-14 (binary compatible)
- *    1.0.7beta15-18           1    10007  2.1.0.7beta15-18 (binary compatible)
- *    1.0.7rc1-2               1    10007  2.1.0.7rc1-2 (binary compatible)
- *    1.0.7                    1    10007  (still compatible)
- *    1.0.8beta1-4             1    10008  2.1.0.8beta1-4
- *    1.0.8rc1                 1    10008  2.1.0.8rc1
- *    1.0.8                    1    10008  2.1.0.8
- *    1.0.9beta1-6             1    10009  2.1.0.9beta1-6
- *    1.0.9rc1                 1    10009  2.1.0.9rc1
- *    1.0.9beta7-10            1    10009  2.1.0.9beta7-10
- *    1.0.9rc2                 1    10009  2.1.0.9rc2
- *    1.0.9                    1    10009  2.1.0.9
- *    1.0.10beta1              1    10010  2.1.0.10beta1
- *    1.0.10rc1                1    10010  2.1.0.10rc1
- *    1.0.10                   1    10010  2.1.0.10
- *    1.0.11beta1-3            1    10011  2.1.0.11beta1-3
- *    1.0.11rc1                1    10011  2.1.0.11rc1
- *    1.0.11                   1    10011  2.1.0.11
- *    1.0.12beta1-2            2    10012  2.1.0.12beta1-2
- *    1.0.12rc1                2    10012  2.1.0.12rc1
- *    1.0.12                   2    10012  2.1.0.12
- *    1.1.0a-f                 -    10100  2.1.1.0a-f (branch abandoned)
- *    1.2.0beta1-2             2    10200  2.1.2.0beta1-2
- *    1.2.0beta3-5             3    10200  3.1.2.0beta3-5
- *    1.2.0rc1                 3    10200  3.1.2.0rc1
- *    1.2.0                    3    10200  3.1.2.0
- *    1.2.1beta1-4             3    10201  3.1.2.1beta1-4
- *    1.2.1rc1-2               3    10201  3.1.2.1rc1-2
- *    1.2.1                    3    10201  3.1.2.1
- *    1.2.2beta1-6            12    10202  12.so.0.1.2.2beta1-6
- *    1.0.13beta1             10    10013  10.so.0.1.0.13beta1
- *    1.0.13rc1               10    10013  10.so.0.1.0.13rc1
- *    1.2.2rc1                12    10202  12.so.0.1.2.2rc1
- *    1.0.13                  10    10013  10.so.0.1.0.13
- *    1.2.2                   12    10202  12.so.0.1.2.2
- *    1.2.3rc1-6              12    10203  12.so.0.1.2.3rc1-6
- *    1.2.3                   12    10203  12.so.0.1.2.3
- *    1.2.4beta1-3            13    10204  12.so.0.1.2.4beta1-3
- *    1.0.14rc1               13    10014  10.so.0.1.0.14rc1
- *    1.2.4rc1                13    10204  12.so.0.1.2.4rc1
- *    1.0.14                  10    10014  10.so.0.1.0.14
- *    1.2.4                   13    10204  12.so.0.1.2.4
- *    1.2.5beta1-2            13    10205  12.so.0.1.2.5beta1-2
- *    1.0.15rc1-3             10    10015  10.so.0.1.0.15rc1-3
- *    1.2.5rc1-3              13    10205  12.so.0.1.2.5rc1-3
- *    1.0.15                  10    10015  10.so.0.1.0.15
- *    1.2.5                   13    10205  12.so.0.1.2.5
- *    1.2.6beta1-4            13    10206  12.so.0.1.2.6beta1-4
- *    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
- *    1.2.7rc1                13    10207  12.so.0.1.2.7rc1
- *    1.0.17                  10    10017  10.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
- *    1.2.8rc1-5              13    10208  12.so.0.1.2.8rc1-5
- *    1.0.18                  10    10018  10.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]
- *    1.2.10                  13    10210  12.so.0.10[.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]
- *    1.2.11                  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]
- *    1.2.13                  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]
- *    1.2.19beta1-31          13    10219  12.so.0.19[.0]
- *    1.0.27rc1-6             10    10027  10.so.0.27[.0]
- *    1.2.19rc1-6             13    10219  12.so.0.19[.0]
- *    1.0.27                  10    10027  10.so.0.27[.0]
- *    1.2.19                  13    10219  12.so.0.19[.0]
- *    1.2.20beta01-04         13    10220  12.so.0.20[.0]
- *    1.0.28rc1-6             10    10028  10.so.0.28[.0]
- *    1.2.20rc1-6             13    10220  12.so.0.20[.0]
- *    1.0.28                  10    10028  10.so.0.28[.0]
- *    1.2.20                  13    10220  12.so.0.20[.0]
- *    1.2.21beta1-2           13    10221  12.so.0.21[.0]
- *    1.2.21rc1-3             13    10221  12.so.0.21[.0]
- *    1.0.29                  10    10029  10.so.0.29[.0]
- *    1.2.21                  13    10221  12.so.0.21[.0]
- *    1.2.22beta1-4           13    10222  12.so.0.22[.0]
- *    1.0.30rc1               10    10030  10.so.0.30[.0]
- *    1.2.22rc1               13    10222  12.so.0.22[.0]
- *    1.0.30                  10    10030  10.so.0.30[.0]
- *    1.2.22                  13    10222  12.so.0.22[.0]
- *    1.2.23beta01-05         13    10223  12.so.0.23[.0]
- *    1.2.23rc01              13    10223  12.so.0.23[.0]
- *    1.2.23                  13    10223  12.so.0.23[.0]
- *    1.2.24beta01-02         13    10224  12.so.0.24[.0]
- *    1.2.24rc01              13    10224  12.so.0.24[.0]
- *    1.2.24                  13    10224  12.so.0.24[.0]
- *    1.2.25beta01-06         13    10225  12.so.0.25[.0]
- *    1.2.25rc01-02           13    10225  12.so.0.25[.0]
- *    1.0.31                  10    10031  10.so.0.31[.0]
- *    1.2.25                  13    10225  12.so.0.25[.0]
- *    1.2.26beta01-06         13    10226  12.so.0.26[.0]
- *    1.2.26rc01              13    10226  12.so.0.26[.0]
- *    1.2.26                  13    10226  12.so.0.26[.0]
- *    1.0.32                  10    10032  10.so.0.32[.0]
- *    1.2.27beta01-06         13    10227  12.so.0.27[.0]
- *    1.2.27rc01              13    10227  12.so.0.27[.0]
- *    1.0.33                  10    10033  10.so.0.33[.0]
- *    1.2.27                  13    10227  12.so.0.27[.0]
- *    1.0.34                  10    10034  10.so.0.34[.0]
- *    1.2.28                  13    10228  12.so.0.28[.0]
- *    1.2.29beta01-03         13    10229  12.so.0.29[.0]
- *    1.2.29rc01              13    10229  12.so.0.29[.0]
- *    1.0.35                  10    10035  10.so.0.35[.0]
- *    1.2.29                  13    10229  12.so.0.29[.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 "rcNN".
- *
- *    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).
- *
- * 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/
- */
-
-/*
- * COPYRIGHT NOTICE, DISCLAIMER, and LICENSE:
- *
- * If you modify libpng you may insert additional notices immediately following
- * this sentence.
- *
- * libpng versions 1.2.6, August 15, 2004, through 1.2.29, May 8, 2008, are
- * Copyright (c) 2004, 2006-2008 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:
- *
- *    Cosmin Truta
- *
- * libpng versions 1.0.7, July 1, 2000, through 1.2.5, October 3, 2002, are
- * Copyright (c) 2000-2002 Glenn Randers-Pehrson, and are
- * distributed according to the same disclaimer and license as libpng-1.0.6
- * with the following individuals added to the list of Contributing Authors:
- *
- *    Simon-Pierre Cadieux
- *    Eric S. Raymond
- *    Gilles Vollant
- *
- * and with the following additions to the disclaimer:
- *
- *    There is no warranty against interference with your enjoyment of the
- *    library or against infringement.  There is no warranty that our
- *    efforts or the library will fulfill any of your particular purposes
- *    or needs.  This library is provided with all faults, and the entire
- *    risk of satisfactory quality, performance, accuracy, and effort is with
- *    the user.
- *
- * libpng versions 0.97, January 1998, through 1.0.6, March 20, 2000, are
- * Copyright (c) 1998, 1999, 2000 Glenn Randers-Pehrson, and are
- * distributed according to the same disclaimer and license as libpng-0.96,
- * with the following individuals added to the list of Contributing Authors:
- *
- *    Tom Lane
- *    Glenn Randers-Pehrson
- *    Willem van Schaik
- *
- * libpng versions 0.89, June 1996, through 0.96, May 1997, are
- * Copyright (c) 1996, 1997 Andreas Dilger
- * Distributed according to the same disclaimer and license as libpng-0.88,
- * with the following individuals added to the list of Contributing Authors:
- *
- *    John Bowler
- *    Kevin Bracey
- *    Sam Bushell
- *    Magnus Holmgren
- *    Greg Roelofs
- *    Tom Tanner
- *
- * libpng versions 0.5, May 1995, through 0.88, January 1996, are
- * Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.
- *
- * For the purposes of this copyright and license, "Contributing Authors"
- * is defined as the following set of individuals:
- *
- *    Andreas Dilger
- *    Dave Martindale
- *    Guy Eric Schalnat
- *    Paul Schmidt
- *    Tim Wegner
- *
- * The PNG Reference Library is supplied "AS IS".  The Contributing Authors
- * and Group 42, Inc. disclaim all warranties, expressed or implied,
- * including, without limitation, the warranties of merchantability and of
- * fitness for any purpose.  The Contributing Authors and Group 42, Inc.
- * assume no liability for direct, indirect, incidental, special, exemplary,
- * or consequential damages, which may result from the use of the PNG
- * Reference Library, even if advised of the possibility of such damage.
- *
- * Permission is hereby granted to use, copy, modify, and distribute this
- * 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.
- *
- * 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.
- *
- * The Contributing Authors and Group 42, Inc. specifically permit, without
- * fee, and encourage the use of this source code as a component to
- * supporting the PNG file format in commercial products.  If you use this
- * source code in a product, acknowledgment is not required but would be
- * appreciated.
- */
-
-/*
- * A "png_get_copyright" function is available, for convenient use in "about"
- * boxes and the like:
- *
- * 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).
- */
-
-/*
- * Libpng is OSI Certified Open Source Software.  OSI Certified is a
- * certification mark of the Open Source Initiative.
- */
-
-/*
- * The contributing authors would like to thank all those who helped
- * with testing, bug fixes, and patience.  This wouldn't have been
- * possible without all of you.
- *
- * Thanks to Frank J. T. Wojcik for helping with the documentation.
- */
-
-/*
- * Y2K compliance in libpng:
- * =========================
- *
- *    May 8, 2008
- *
- *    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 1.2.29 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
- *    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.
- *
- *    There are seven time-related functions:
- *        png.c: png_convert_to_rfc_1123() in png.c
- *          (formerly png_convert_to_rfc_1152() in error)
- *        png_convert_from_struct_tm() in pngwrite.c, called in pngwrite.c
- *        png_convert_from_time_t() in pngwrite.c
- *        png_get_tIME() in pngget.c
- *        png_handle_tIME() in pngrutil.c, called in pngread.c
- *        png_set_tIME() in pngset.c
- *        png_write_tIME() in pngwutil.c, called in pngwrite.c
- *
- *    All handle dates properly in a Y2K environment.  The
- *    png_convert_from_time_t() function calls gmtime() to convert from system
- *    clock time, which returns (year - 1900), which we properly convert to
- *    the full 4-digit year.  There is a possibility that applications using
- *    libpng are not passing 4-digit years into the png_convert_to_rfc_1123()
- *    function, or that they are incorrectly passing only a 2-digit year
- *    instead of "year - 1900" into the png_convert_from_struct_tm() function,
- *    but this is not under our control.  The libpng documentation has always
- *    stated that it works with 4-digit years, and the APIs have been
- *    documented as such.
- *
- *    The tIME chunk itself is also Y2K compliant.  It uses a 2-byte unsigned
- *    integer to hold the year, and can hold years as large as 65535.
- *
- *    zlib, upon which libpng depends, is also Y2K compliant.  It contains
- *    no date-related code.
- *
- *       Glenn Randers-Pehrson
- *       libpng maintainer
- *       PNG Development Group
- */
-
-#ifndef PNG_H
-#define PNG_H
-
-/* This is not the place to learn how to use libpng.  The file libpng.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 "1.2.29"
-#define PNG_HEADER_VERSION_STRING \
-   " libpng version 1.2.29 - May 8, 2008\n"
-
-#define PNG_LIBPNG_VER_SONUM   0
-#define PNG_LIBPNG_VER_DLLNUM  13
-
-/* 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 29
-/* This should match the numeric part of the final component of
- * PNG_LIBPNG_VER_STRING, omitting any leading zero: */
-
-#define PNG_LIBPNG_VER_BUILD  0
-
-/* Release Status */
-#define PNG_LIBPNG_BUILD_ALPHA    1
-#define PNG_LIBPNG_BUILD_BETA     2
-#define PNG_LIBPNG_BUILD_RC       3
-#define PNG_LIBPNG_BUILD_STABLE   4
-#define PNG_LIBPNG_BUILD_RELEASE_STATUS_MASK 7
-  
-/* Release-Specific Flags */
-#define PNG_LIBPNG_BUILD_PATCH    8 /* Can be OR'ed with
-                                       PNG_LIBPNG_BUILD_STABLE only */
-#define PNG_LIBPNG_BUILD_PRIVATE 16 /* Cannot be OR'ed with
-                                       PNG_LIBPNG_BUILD_SPECIAL */
-#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
-
-/* 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 10229 /* 1.2.29 */
-
-#ifndef PNG_VERSION_INFO_ONLY
-/* include the compression library's header */
-#include "zlib.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
- * VS_FF_PRIVATEBUILD File *was not* built using standard release
- * procedures. If this value is given, the StringFileInfo block must
- * contain a PrivateBuild string. 
- *
- * VS_FF_SPECIALBUILD File *was* built by the original company using
- * standard release procedures but is a variation of the standard
- * file of the same version number. If this value is given, the
- * StringFileInfo block must contain a SpecialBuild string. 
- */
-
-#if defined(PNG_USER_PRIVATEBUILD)
-#  define PNG_LIBPNG_BUILD_TYPE \
-          (PNG_LIBPNG_BUILD_BASE_TYPE | PNG_LIBPNG_BUILD_PRIVATE)
-#else
-#  if defined(PNG_LIBPNG_SPECIALBUILD)
-#    define PNG_LIBPNG_BUILD_TYPE \
-            (PNG_LIBPNG_BUILD_BASE_TYPE | PNG_LIBPNG_BUILD_SPECIAL)
-#  else
-#    define PNG_LIBPNG_BUILD_TYPE (PNG_LIBPNG_BUILD_BASE_TYPE)
-#  endif
-#endif
-
-#ifndef PNG_VERSION_INFO_ONLY
-
-/* Inhibit C++ name-mangling for libpng functions but not for system calls. */
-#ifdef __cplusplus
-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 (PNG_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 (PNG_CONST int FARDATA) png_pass_start[7];
-PNG_EXPORT_VAR (PNG_CONST int FARDATA) png_pass_inc[7];
-PNG_EXPORT_VAR (PNG_CONST int FARDATA) png_pass_ystart[7];
-PNG_EXPORT_VAR (PNG_CONST int FARDATA) png_pass_yinc[7];
-PNG_EXPORT_VAR (PNG_CONST int FARDATA) png_pass_mask[7];
-PNG_EXPORT_VAR (PNG_CONST int FARDATA) png_pass_dsp_mask[7];
-/* This isn't currently used.  If you need it, see png.c for more details.
-PNG_EXPORT_VAR (PNG_CONST int FARDATA) png_pass_height[7];
-*/
-#endif
-
-#endif /* PNG_NO_EXTERN */
-
-/* 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
- * be png_byte or png_uint_16 (as defined below).
- */
-typedef struct png_color_struct
-{
-   png_byte red;
-   png_byte green;
-   png_byte blue;
-} png_color;
-typedef png_color FAR * png_colorp;
-typedef png_color FAR * FAR * png_colorpp;
-
-typedef struct png_color_16_struct
-{
-   png_byte index;    /* used for palette files */
-   png_uint_16 red;   /* for use in red green blue files */
-   png_uint_16 green;
-   png_uint_16 blue;
-   png_uint_16 gray;  /* for use in grayscale files */
-} png_color_16;
-typedef png_color_16 FAR * png_color_16p;
-typedef png_color_16 FAR * FAR * png_color_16pp;
-
-typedef struct png_color_8_struct
-{
-   png_byte red;   /* for use in red green blue files */
-   png_byte green;
-   png_byte blue;
-   png_byte gray;  /* for use in grayscale files */
-   png_byte alpha; /* for alpha channel files */
-} png_color_8;
-typedef png_color_8 FAR * png_color_8p;
-typedef png_color_8 FAR * FAR * png_color_8pp;
-
-/*
- * The following two structures are used for the in-core representation
- * of sPLT chunks.
- */
-typedef struct png_sPLT_entry_struct
-{
-   png_uint_16 red;
-   png_uint_16 green;
-   png_uint_16 blue;
-   png_uint_16 alpha;
-   png_uint_16 frequency;
-} png_sPLT_entry;
-typedef png_sPLT_entry FAR * png_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
- *  occupy the LSB of their respective members, and the MSB of each member
- *  is zero-filled.  The frequency member always occupies the full 16 bits.
- */
-
-typedef struct png_sPLT_struct
-{
-   png_charp name;           /* palette name */
-   png_byte depth;           /* depth of palette samples */
-   png_sPLT_entryp entries;  /* palette entries */
-   png_int_32 nentries;      /* number of palette entries */
-} png_sPLT_t;
-typedef png_sPLT_t FAR * png_sPLT_tp;
-typedef png_sPLT_t FAR * FAR * png_sPLT_tpp;
-
-#ifdef PNG_TEXT_SUPPORTED
-/* png_text holds the contents of a text/ztxt/itxt chunk in a PNG file,
- * 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
- * regular zero-terminated C strings (possibly empty), never NULL pointers,
- * so they can be safely used in printf() and other string-handling functions.
- */
-typedef struct png_text_struct
-{
-   int  compression;       /* compression value:
-                             -1: tEXt, none
-                              0: zTXt, deflate
-                              1: iTXt, none
-                              2: iTXt, deflate  */
-   png_charp key;          /* keyword, 1-79 character description of "text" */
-   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_text FAR * FAR * png_textpp;
-#endif
-
-/* Supported compression types for text in PNG files (tEXt, and zTXt).
- * The values of the PNG_TEXT_COMPRESSION_ defines should NOT be changed. */
-#define PNG_TEXT_COMPRESSION_NONE_WR -3
-#define PNG_TEXT_COMPRESSION_zTXt_WR -2
-#define PNG_TEXT_COMPRESSION_NONE    -1
-#define PNG_TEXT_COMPRESSION_zTXt     0
-#define PNG_ITXT_COMPRESSION_NONE     1
-#define PNG_ITXT_COMPRESSION_zTXt     2
-#define PNG_TEXT_COMPRESSION_LAST     3  /* Not a valid value */
-
-/* png_time is a way to hold the time in an machine independent way.
- * Two conversions are provided, both from time_t and struct tm.  There
- * is no portable way to convert to either of these structures, as far
- * as I know.  If you know of a portable way, send it to me.  As a side
- * note - PNG has always been Year 2000 compliant!
- */
-typedef struct png_time_struct
-{
-   png_uint_16 year; /* full year, as in, 1995 */
-   png_byte month;   /* month of year, 1 - 12 */
-   png_byte day;     /* day of month, 1 - 31 */
-   png_byte hour;    /* hour of day, 0 - 23 */
-   png_byte minute;  /* minute of hour, 0 - 59 */
-   png_byte second;  /* second of minute, 0 - 60 (for leap seconds) */
-} png_time;
-typedef png_time FAR * png_timep;
-typedef png_time FAR * FAR * png_timepp;
-
-#if defined(PNG_UNKNOWN_CHUNKS_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
- * know about their semantics.
- */
-#define PNG_CHUNK_NAME_LENGTH 5
-typedef struct png_unknown_chunk_t
-{
-    png_byte name[PNG_CHUNK_NAME_LENGTH];
-    png_byte *data;
-    png_size_t size;
-
-    /* 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_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.
- */
-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 png_info FAR * png_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 describe the color_type field in png_info. */
-/* color type masks */
-#define PNG_COLOR_MASK_PALETTE    1
-#define PNG_COLOR_MASK_COLOR      2
-#define PNG_COLOR_MASK_ALPHA      4
-
-/* color types.  Note that not all combinations are legal */
-#define PNG_COLOR_TYPE_GRAY 0
-#define PNG_COLOR_TYPE_PALETTE  (PNG_COLOR_MASK_COLOR | PNG_COLOR_MASK_PALETTE)
-#define PNG_COLOR_TYPE_RGB        (PNG_COLOR_MASK_COLOR)
-#define PNG_COLOR_TYPE_RGB_ALPHA  (PNG_COLOR_MASK_COLOR | PNG_COLOR_MASK_ALPHA)
-#define PNG_COLOR_TYPE_GRAY_ALPHA (PNG_COLOR_MASK_ALPHA)
-/* aliases */
-#define PNG_COLOR_TYPE_RGBA  PNG_COLOR_TYPE_RGB_ALPHA
-#define PNG_COLOR_TYPE_GA  PNG_COLOR_TYPE_GRAY_ALPHA
-
-/* This is for compression type. PNG 1.0-1.2 only define the single type. */
-#define PNG_COMPRESSION_TYPE_BASE 0 /* Deflate method 8, 32K window */
-#define PNG_COMPRESSION_TYPE_DEFAULT PNG_COMPRESSION_TYPE_BASE
-
-/* This is for filter type. PNG 1.0-1.2 only define the single type. */
-#define PNG_FILTER_TYPE_BASE      0 /* Single row per-byte filtering */
-#define PNG_INTRAPIXEL_DIFFERENCING 64 /* Used only in MNG datastreams */
-#define PNG_FILTER_TYPE_DEFAULT   PNG_FILTER_TYPE_BASE
-
-/* These are for the interlacing type.  These values should NOT be changed. */
-#define PNG_INTERLACE_NONE        0 /* Non-interlaced image */
-#define PNG_INTERLACE_ADAM7       1 /* Adam7 interlacing */
-#define PNG_INTERLACE_LAST        2 /* Not a valid value */
-
-/* These are for the oFFs chunk.  These values should NOT be changed. */
-#define PNG_OFFSET_PIXEL          0 /* Offset in pixels */
-#define PNG_OFFSET_MICROMETER     1 /* Offset in micrometers (1/10^6 meter) */
-#define PNG_OFFSET_LAST           2 /* Not a valid value */
-
-/* These are for the pCAL chunk.  These values should NOT be changed. */
-#define PNG_EQUATION_LINEAR       0 /* Linear transformation */
-#define PNG_EQUATION_BASE_E       1 /* Exponential base e transform */
-#define PNG_EQUATION_ARBITRARY    2 /* Arbitrary base exponential transform */
-#define PNG_EQUATION_HYPERBOLIC   3 /* Hyperbolic sine transformation */
-#define PNG_EQUATION_LAST         4 /* Not a valid value */
-
-/* These are for the sCAL chunk.  These values should NOT be changed. */
-#define PNG_SCALE_UNKNOWN         0 /* unknown unit (image scale) */
-#define PNG_SCALE_METER           1 /* meters per pixel */
-#define PNG_SCALE_RADIAN          2 /* radians per pixel */
-#define PNG_SCALE_LAST            3 /* Not a valid value */
-
-/* These are for the pHYs chunk.  These values should NOT be changed. */
-#define PNG_RESOLUTION_UNKNOWN    0 /* pixels/unknown unit (aspect ratio) */
-#define PNG_RESOLUTION_METER      1 /* pixels/meter */
-#define PNG_RESOLUTION_LAST       2 /* Not a valid value */
-
-/* These are for the sRGB chunk.  These values should NOT be changed. */
-#define PNG_sRGB_INTENT_PERCEPTUAL 0
-#define PNG_sRGB_INTENT_RELATIVE   1
-#define PNG_sRGB_INTENT_SATURATION 2
-#define PNG_sRGB_INTENT_ABSOLUTE   3
-#define PNG_sRGB_INTENT_LAST       4 /* Not a valid value */
-
-/* This is for text chunks */
-#define PNG_KEYWORD_MAX_LENGTH     79
-
-/* Maximum number of entries in PLTE/sPLT/tRNS arrays */
-#define PNG_MAX_PALETTE_LENGTH    256
-
-/* These determine if an ancillary chunk's data has been successfully read
- * from the PNG header, or if the application has filled in the corresponding
- * data in the info_struct to be written into the output file.  The values
- * of the PNG_INFO_<chunk> defines should NOT be changed.
- */
-#define PNG_INFO_gAMA 0x0001
-#define PNG_INFO_sBIT 0x0002
-#define PNG_INFO_cHRM 0x0004
-#define PNG_INFO_PLTE 0x0008
-#define PNG_INFO_tRNS 0x0010
-#define PNG_INFO_bKGD 0x0020
-#define PNG_INFO_hIST 0x0040
-#define PNG_INFO_pHYs 0x0080
-#define PNG_INFO_oFFs 0x0100
-#define PNG_INFO_tIME 0x0200
-#define PNG_INFO_pCAL 0x0400
-#define PNG_INFO_sRGB 0x0800   /* GR-P, 0.96a */
-#define PNG_INFO_iCCP 0x1000   /* ESR, 1.0.6 */
-#define PNG_INFO_sPLT 0x2000   /* ESR, 1.0.6 */
-#define PNG_INFO_sCAL 0x4000   /* ESR, 1.0.6 */
-#define PNG_INFO_IDAT 0x8000L  /* ESR, 1.0.6 */
-
-/* This is used for the transformation routines, as some of them
- * change these values for the row.  It also should enable using
- * the routines for other purposes.
- */
-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_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;
-
-/* 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.
- */
-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));
-
-#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));
-#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));
-#endif
-
-#if defined(PNG_USER_CHUNKS_SUPPORTED)
-typedef int (PNGAPI *png_user_chunk_ptr) PNGARG((png_structp, png_unknown_chunkp));
-#endif
-#if defined(PNG_UNKNOWN_CHUNKS_SUPPORTED)
-typedef void (PNGAPI *png_unknown_chunk_ptr) PNGARG((png_structp));
-#endif
-
-/* Transform masks for the high-level interface */
-#define PNG_TRANSFORM_IDENTITY       0x0000    /* read and write */
-#define PNG_TRANSFORM_STRIP_16       0x0001    /* read only */
-#define PNG_TRANSFORM_STRIP_ALPHA    0x0002    /* read only */
-#define PNG_TRANSFORM_PACKING        0x0004    /* read and write */
-#define PNG_TRANSFORM_PACKSWAP       0x0008    /* read and write */
-#define PNG_TRANSFORM_EXPAND         0x0010    /* read only */
-#define PNG_TRANSFORM_INVERT_MONO    0x0020    /* read and write */
-#define PNG_TRANSFORM_SHIFT          0x0040    /* read and write */
-#define PNG_TRANSFORM_BGR            0x0080    /* read and write */
-#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 */
-
-/* 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.
- */
-
-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 */
-#ifndef PNG_NO_WRITE_FILTERING
-   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 */
-#endif
-   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_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)
-/* 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
-
-/* New members added in libpng-1.2.26 */
-  png_uint_32 old_big_row_buf_size, old_prev_row_size;
-};
-
-
-/* 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_29;
-
-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
- * full explanation, see example.c for the summary.  This just provides
- * a simple one line description of the use of each function.
- */
-
-/* Returns the version number of the library */
-extern PNG_EXPORT(png_uint_32,png_access_version_number) PNGARG((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));
-
-/* 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));
-
-/* 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));
-
-/* 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));
-
-/* 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));
-
-#ifdef PNG_WRITE_SUPPORTED
-extern PNG_EXPORT(png_uint_32,png_get_compression_buffer_size)
-   PNGARG((png_structp png_ptr));
-#endif
-
-#ifdef PNG_WRITE_SUPPORTED
-extern PNG_EXPORT(void,png_set_compression_buffer_size)
-   PNGARG((png_structp png_ptr, png_uint_32 size));
-#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));
-#endif
-
-/* 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));
-
-/* 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));
-
-/* 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));
-
-/* Finish a chunk started with png_write_chunk_start() (includes CRC). */
-extern PNG_EXPORT(void,png_write_chunk_end) PNGARG((png_structp png_ptr));
-
-/* Allocate and initialize the info structure */
-extern PNG_EXPORT(png_infop,png_create_info_struct)
-   PNGARG((png_structp png_ptr));
-
-#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_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));
-
-#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));
-#endif
-
-#if defined(PNG_TIME_RFC1123_SUPPORTED)
-extern PNG_EXPORT(png_charp,png_convert_to_rfc1123)
-   PNGARG((png_structp png_ptr, png_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));
-
-/* 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 */
-
-#if defined(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));
-#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
-#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));
-#endif
-
-#if defined(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));
-#endif
-
-#if defined(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));
-#endif
-
-extern PNG_EXPORT(void,png_build_grayscale_palette) PNGARG((int bit_depth,
-   png_colorp palette));
-
-#if defined(PNG_READ_STRIP_ALPHA_SUPPORTED)
-extern PNG_EXPORT(void,png_set_strip_alpha) PNGARG((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));
-#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));
-#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));
-/* The values of the PNG_FILLER_ defines should NOT be changed */
-#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
-#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));
-#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));
-#endif
-
-#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));
-#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));
-#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));
-#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));
-#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));
-#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
-#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));
-#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));
-#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
-#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
-#endif
-
-#if defined(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));
-/* Flush the current PNG output buffer */
-extern PNG_EXPORT(void,png_write_flush) PNGARG((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 call to update the users info structure */
-extern PNG_EXPORT(void,png_read_update_info) PNGARG((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));
-#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));
-#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));
-#endif
-
-/* write a row of image data */
-extern PNG_EXPORT(void,png_write_row) PNGARG((png_structp png_ptr,
-   png_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 the image data */
-extern PNG_EXPORT(void,png_write_image) PNGARG((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));
-
-#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));
-#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_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 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 */
-extern PNG_EXPORT(void,png_destroy_write_struct)
-   PNGARG((png_structpp png_ptr_ptr, png_infopp info_ptr_ptr));
-
-/* 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
- * 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,
- * whereas in version 0.90 and later, the action for CRC errors in ancillary
- * chunks is warn/discard.  These values should NOT be changed.
- *
- *      value                       action:critical     action:ancillary
- */
-#define PNG_CRC_DEFAULT       0  /* error/quit          warn/discard data */
-#define PNG_CRC_ERROR_QUIT    1  /* error/quit          error/quit        */
-#define PNG_CRC_WARN_DISCARD  2  /* (INVALID)           warn/discard data */
-#define PNG_CRC_WARN_USE      3  /* warn/use data       warn/use data     */
-#define PNG_CRC_QUIET_USE     4  /* quiet/use data      quiet/use data    */
-#define PNG_CRC_NO_CHANGE     5  /* use current value   use current value */
-
-/* These functions give the user control over the scan-line filtering in
- * libpng and the compression methods used by zlib.  These functions are
- * mainly useful for testing, as the defaults should work with most users.
- * Those users who are tight on memory or want faster performance at the
- * expense of compression can modify them.  See the compression library
- * header file (zlib.h) for an explination of the compression functions.
- */
-
-/* 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));
-
-/* 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
- * below, in case they are supplied instead of the #defined constants.
- * These values should NOT be changed.
- */
-#define PNG_NO_FILTERS     0x00
-#define PNG_FILTER_NONE    0x08
-#define PNG_FILTER_SUB     0x10
-#define PNG_FILTER_UP      0x20
-#define PNG_FILTER_AVG     0x40
-#define PNG_FILTER_PAETH   0x80
-#define PNG_ALL_FILTERS (PNG_FILTER_NONE | PNG_FILTER_SUB | PNG_FILTER_UP | \
-                         PNG_FILTER_AVG | PNG_FILTER_PAETH)
-
-/* Filter values (not flags) - used in pngwrite.c, pngwutil.c for now.
- * These defines should NOT be changed.
- */
-#define PNG_FILTER_VALUE_NONE  0
-#define PNG_FILTER_VALUE_SUB   1
-#define PNG_FILTER_VALUE_UP    2
-#define PNG_FILTER_VALUE_AVG   3
-#define PNG_FILTER_VALUE_PAETH 4
-#define PNG_FILTER_VALUE_LAST  5
-
-#if defined(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).
- *
- * Weights are factors >= 1.0, indicating how important it is to keep the
- * filter type consistent between rows.  Larger numbers mean the current
- * filter is that many times as likely to be the same as the "num_weights"
- * previous filters.  This is cumulative for each previous row with a weight.
- * There needs to be "num_weights" values in "filter_weights", or it can be
- * NULL if the weights aren't being specified.  Weights have no influence on
- * the selection of the first row filter.  Well chosen weights can (in theory)
- * improve the compression for a given image.
- *
- * Costs are factors >= 1.0 indicating the relative decoding costs of a
- * filter type.  Higher costs indicate more decoding expense, and are
- * therefore less likely to be selected over a filter with lower computational
- * costs.  There needs to be a value in "filter_costs" for each valid filter
- * type (given by PNG_FILTER_VALUE_LAST), or it can be NULL if you aren't
- * setting the costs.  Costs try to improve the speed of decompression without
- * unduly increasing the compressed image size.
- *
- * A negative weight or cost indicates the default value is to be used, and
- * values in the range [0.0, 1.0) indicate the value is to remain unchanged.
- * The default values for both weights and costs are currently 1.0, but may
- * change if good general weighting/cost heuristics can be found.  If both
- * 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
-#endif /*  PNG_WRITE_WEIGHTED_FILTER_SUPPORTED */
-
-/* Heuristic used for row filter selection.  These defines should NOT be
- * changed.
- */
-#define PNG_FILTER_HEURISTIC_DEFAULT    0  /* Currently "UNWEIGHTED" */
-#define PNG_FILTER_HEURISTIC_UNWEIGHTED 1  /* Used by libpng < 0.95 */
-#define PNG_FILTER_HEURISTIC_WEIGHTED   2  /* Experimental feature */
-#define PNG_FILTER_HEURISTIC_LAST       3  /* Not a valid value */
-
-/* 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
- * shown that zlib compression levels 3-6 usually perform as well as level 9
- * 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));
-
-extern PNG_EXPORT(void,png_set_compression_mem_level)
-   PNGARG((png_structp png_ptr, int mem_level));
-
-extern PNG_EXPORT(void,png_set_compression_strategy)
-   PNGARG((png_structp png_ptr, int strategy));
-
-extern PNG_EXPORT(void,png_set_compression_window_bits)
-   PNGARG((png_structp png_ptr, int window_bits));
-
-extern PNG_EXPORT(void,png_set_compression_method) PNGARG((png_structp png_ptr,
-   int method));
-
-/* 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
- * more information.
- */
-
-#if !defined(PNG_NO_STDIO)
-/* 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));
-#endif
-
-/* Replace the (error and abort), and warning functions with user
- * supplied functions.  If no messages are to be printed you must still
- * write and use replacement functions. The replacement error_fn should
- * still do a longjmp to the last setjmp location if you are using this
- * method of error handling.  If error_fn or warning_fn is NULL, the
- * 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));
-
-/* Return the user pointer associated with the error functions */
-extern PNG_EXPORT(png_voidp,png_get_error_ptr) PNGARG((png_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).
- */
-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));
-
-/* 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));
-
-/* Return the user pointer associated with the I/O functions */
-extern PNG_EXPORT(png_voidp,png_get_io_ptr) PNGARG((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));
-
-extern PNG_EXPORT(void,png_set_write_status_fn) PNGARG((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));
-/* Return the user pointer associated with the memory functions */
-extern PNG_EXPORT(png_voidp,png_get_mem_ptr) PNGARG((png_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));
-#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));
-#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));
-/* 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));
-#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));
-#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));
-
-/* returns the user pointer associated with the push read functions */
-extern PNG_EXPORT(png_voidp,png_get_progressive_ptr)
-   PNGARG((png_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 that combines rows.  Not very much different than the
- * png_combine_row() call.  Is this even used?????
- */
-extern PNG_EXPORT(void,png_progressive_combine_row) PNGARG((png_structp png_ptr,
-   png_bytep old_row, png_bytep new_row));
-#endif /* PNG_PROGRESSIVE_READ_SUPPORTED */
-
-extern PNG_EXPORT(png_voidp,png_malloc) PNGARG((png_structp png_ptr,
-   png_uint_32 size));
-
-#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
-
-/* 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
-
-/* 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
-/* 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 */
-#define PNG_DESTROY_WILL_FREE_DATA 1
-#define PNG_SET_WILL_FREE_DATA 1
-#define PNG_USER_WILL_FREE_DATA 2
-/* Flags for png_ptr->free_me and info_ptr->free_me */
-#define PNG_FREE_HIST 0x0008
-#define PNG_FREE_ICCP 0x0010
-#define PNG_FREE_SPLT 0x0020
-#define PNG_FREE_ROWS 0x0040
-#define PNG_FREE_PCAL 0x0080
-#define PNG_FREE_SCAL 0x0100
-#define PNG_FREE_UNKN 0x0200
-#define PNG_FREE_LIST 0x0400
-#define PNG_FREE_PLTE 0x1000
-#define PNG_FREE_TRNS 0x2000
-#define PNG_FREE_TEXT 0x4000
-#define PNG_FREE_ALL  0x7fff
-#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));
-#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 */
-
-#ifndef PNG_NO_ERROR_TEXT
-/* 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));
-
-/* 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));
-#else
-/* Fatal error in PNG image of libpng - can't continue */
-extern PNG_EXPORT(void,png_err) PNGARG((png_structp png_ptr));
-#endif
-
-#ifndef PNG_NO_WARNINGS
-/* 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));
-
-#ifdef PNG_READ_SUPPORTED
-/* 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));
-#endif /* PNG_READ_SUPPORTED */
-#endif /* PNG_NO_WARNINGS */
-
-/* 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
- * png_info_struct, either storing the parameters in the passed variables, or
- * setting pointers into the png_info_struct where the data is stored.  The
- * png_get_<chunk> functions return a non-zero value if the data was available
- * in info_ptr, or return zero and do not change any of the parameters if the
- * data was not available.
- *
- * These functions should be used instead of directly accessing png_info
- * to avoid problems with future changes in the size and internal layout of
- * 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));
-
-/* 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));
-
-#if defined(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));
-/* 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));
-#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));
-
-#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));
-
-/* Returns image height in pixels. */
-extern PNG_EXPORT(png_uint_32, png_get_image_height) PNGARG((png_structp
-png_ptr, png_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));
-
-/* Returns image color_type. */
-extern PNG_EXPORT(png_byte, png_get_color_type) PNGARG((png_structp
-png_ptr, png_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));
-
-/* Returns image interlace_type. */
-extern PNG_EXPORT(png_byte, png_get_interlace_type) PNGARG((png_structp
-png_ptr, png_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));
-
-/* 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));
-
-/* 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
-
-/* 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));
-
-#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));
-
-#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));
-#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));
-#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));
-#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
-#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));
-#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));
-#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));
-#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));
-#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));
-
-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));
-
-#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));
-#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));
-#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));
-#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));
-#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));
-#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));
-#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));
-
-extern PNG_EXPORT(void,png_set_PLTE) PNGARG((png_structp png_ptr,
-   png_infop info_ptr, png_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));
-#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));
-#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));
-#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));
-#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 */
-#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 */
-#endif
-
-#if defined(PNG_sPLT_SUPPORTED)
-extern PNG_EXPORT(png_uint_32,png_get_sPLT) PNGARG((png_structp png_ptr,
-   png_infop info_ptr, png_sPLT_tpp entries));
-#endif
-
-#if defined(PNG_sPLT_SUPPORTED)
-extern PNG_EXPORT(void,png_set_sPLT) PNGARG((png_structp png_ptr,
-   png_infop info_ptr, png_sPLT_tp entries, int nentries));
-#endif
-
-#if defined(PNG_TEXT_SUPPORTED)
-/* png_get_text also returns the number of text chunks in *num_text */
-extern PNG_EXPORT(png_uint_32,png_get_text) PNGARG((png_structp png_ptr,
-   png_infop info_ptr, png_textp *text_ptr, int *num_text));
-#endif
-
-/*
- *  Note while png_set_text() will accept a structure whose text,
- *  language, and  translated keywords are NULL pointers, the structure
- *  returned by png_get_text will always contain regular
- *  zero-terminated C strings.  They might be empty strings but
- *  they will never be NULL pointers.
- */
-
-#if defined(PNG_TEXT_SUPPORTED)
-extern PNG_EXPORT(void,png_set_text) PNGARG((png_structp png_ptr,
-   png_infop info_ptr, png_textp text_ptr, int num_text));
-#endif
-
-#if defined(PNG_tIME_SUPPORTED)
-extern PNG_EXPORT(png_uint_32,png_get_tIME) PNGARG((png_structp png_ptr,
-   png_infop info_ptr, png_timep *mod_time));
-#endif
-
-#if defined(PNG_tIME_SUPPORTED)
-extern PNG_EXPORT(void,png_set_tIME) PNGARG((png_structp png_ptr,
-   png_infop info_ptr, png_timep mod_time));
-#endif
-
-#if defined(PNG_tRNS_SUPPORTED)
-extern PNG_EXPORT(png_uint_32,png_get_tRNS) PNGARG((png_structp png_ptr,
-   png_infop info_ptr, png_bytep *trans, int *num_trans,
-   png_color_16p *trans_values));
-#endif
-
-#if defined(PNG_tRNS_SUPPORTED)
-extern PNG_EXPORT(void,png_set_tRNS) PNGARG((png_structp png_ptr,
-   png_infop info_ptr, png_bytep trans, int num_trans,
-   png_color_16p trans_values));
-#endif
-
-#if defined(PNG_tRNS_SUPPORTED)
-#endif
-
-#if defined(PNG_sCAL_SUPPORTED)
-#ifdef PNG_FLOATING_POINT_SUPPORTED
-extern PNG_EXPORT(png_uint_32,png_get_sCAL) PNGARG((png_structp png_ptr,
-   png_infop info_ptr, int *unit, double *width, double *height));
-#else
-#ifdef PNG_FIXED_POINT_SUPPORTED
-extern PNG_EXPORT(png_uint_32,png_get_sCAL_s) PNGARG((png_structp png_ptr,
-   png_infop info_ptr, int *unit, png_charpp swidth, png_charpp sheight));
-#endif
-#endif
-#endif /* PNG_sCAL_SUPPORTED */
-
-#if defined(PNG_sCAL_SUPPORTED)
-#ifdef PNG_FLOATING_POINT_SUPPORTED
-extern PNG_EXPORT(void,png_set_sCAL) PNGARG((png_structp png_ptr,
-   png_infop info_ptr, int unit, double width, double height));
-#else
-#ifdef PNG_FIXED_POINT_SUPPORTED
-extern PNG_EXPORT(void,png_set_sCAL_s) PNGARG((png_structp png_ptr,
-   png_infop info_ptr, int unit, png_charp swidth, png_charp sheight));
-#endif
-#endif
-#endif /* PNG_sCAL_SUPPORTED || PNG_WRITE_sCAL_SUPPORTED */
-
-#if defined(PNG_UNKNOWN_CHUNKS_SUPPORTED)
-/* provide a list of chunks and how they are to be handled, if the built-in
-   handling or default unknown chunk handling is not desired.  Any chunks not
-   listed will be handled in the default manner.  The IHDR and IEND chunks
-   must not be listed.
-      keep = 0: follow default behaviour
-           = 1: do not keep
-           = 2: keep only if safe-to-copy
-           = 3: keep even if unsafe-to-copy
-*/
-extern PNG_EXPORT(void, png_set_keep_unknown_chunks) PNGARG((png_structp
-   png_ptr, int keep, png_bytep chunk_list, int num_chunks));
-extern PNG_EXPORT(void, png_set_unknown_chunks) PNGARG((png_structp png_ptr,
-   png_infop info_ptr, png_unknown_chunkp unknowns, int num_unknowns));
-extern PNG_EXPORT(void, png_set_unknown_chunk_location)
-   PNGARG((png_structp png_ptr, png_infop info_ptr, int chunk, int location));
-extern PNG_EXPORT(png_uint_32,png_get_unknown_chunks) PNGARG((png_structp
-   png_ptr, png_infop info_ptr, png_unknown_chunkpp entries));
-#endif
-#ifdef PNG_HANDLE_AS_UNKNOWN_SUPPORTED
-PNG_EXPORT(int,png_handle_as_unknown) PNGARG((png_structp png_ptr, png_bytep
-   chunk_name));
-#endif
-
-/* Png_free_data() will turn off the "valid" flag for anything it frees.
-   If you need to turn it off for a chunk that your application has freed,
-   you can use png_set_invalid(png_ptr, info_ptr, PNG_INFO_CHNK); */
-extern PNG_EXPORT(void, png_set_invalid) PNGARG((png_structp png_ptr,
-   png_infop info_ptr, int mask));
-
-#if defined(PNG_INFO_IMAGE_SUPPORTED)
-/* The "params" pointer is currently not used and is for future expansion. */
-extern PNG_EXPORT(void, png_read_png) PNGARG((png_structp png_ptr,
-                        png_infop info_ptr,
-                        int transforms,
-                        png_voidp params));
-extern PNG_EXPORT(void, png_write_png) PNGARG((png_structp png_ptr,
-                        png_infop info_ptr,
-                        int transforms,
-                        png_voidp params));
-#endif
-
-/* Define PNG_DEBUG at compile time for debugging information.  Higher
- * numbers for PNG_DEBUG mean more debugging information.  This has
- * only been added since version 0.95 so it is not implemented throughout
- * libpng yet, but more support will be added as needed.
- */
-#ifdef PNG_DEBUG
-#if (PNG_DEBUG > 0)
-#if !defined(PNG_DEBUG_FILE) && defined(_MSC_VER)
-#include <crtdbg.h>
-#if (PNG_DEBUG > 1)
-#define png_debug(l,m)  _RPT0(_CRT_WARN,m)
-#define png_debug1(l,m,p1)  _RPT1(_CRT_WARN,m,p1)
-#define png_debug2(l,m,p1,p2) _RPT2(_CRT_WARN,m,p1,p2)
-#endif
-#else /* PNG_DEBUG_FILE || !_MSC_VER */
-#ifndef PNG_DEBUG_FILE
-#define PNG_DEBUG_FILE stderr
-#endif /* PNG_DEBUG_FILE */
-#if (PNG_DEBUG > 1)
-#define png_debug(l,m) \
-{ \
-     int num_tabs=l; \
-     fprintf(PNG_DEBUG_FILE,"%s"m,(num_tabs==1 ? "\t" : \
-       (num_tabs==2 ? "\t\t":(num_tabs>2 ? "\t\t\t":"")))); \
-}
-#define png_debug1(l,m,p1) \
-{ \
-     int num_tabs=l; \
-     fprintf(PNG_DEBUG_FILE,"%s"m,(num_tabs==1 ? "\t" : \
-       (num_tabs==2 ? "\t\t":(num_tabs>2 ? "\t\t\t":""))),p1); \
-}
-#define png_debug2(l,m,p1,p2) \
-{ \
-     int num_tabs=l; \
-     fprintf(PNG_DEBUG_FILE,"%s"m,(num_tabs==1 ? "\t" : \
-       (num_tabs==2 ? "\t\t":(num_tabs>2 ? "\t\t\t":""))),p1,p2); \
-}
-#endif /* (PNG_DEBUG > 1) */
-#endif /* _MSC_VER */
-#endif /* (PNG_DEBUG > 0) */
-#endif /* PNG_DEBUG */
-#ifndef png_debug
-#define png_debug(l, m)
-#endif
-#ifndef png_debug1
-#define png_debug1(l, m, p1)
-#endif
-#ifndef png_debug2
-#define png_debug2(l, m, p1, p2)
-#endif
-
-extern PNG_EXPORT(png_charp,png_get_copyright) PNGARG((png_structp png_ptr));
-extern PNG_EXPORT(png_charp,png_get_header_ver) PNGARG((png_structp png_ptr));
-extern PNG_EXPORT(png_charp,png_get_header_version) PNGARG((png_structp png_ptr));
-extern PNG_EXPORT(png_charp,png_get_libpng_ver) PNGARG((png_structp png_ptr));
-
-#ifdef PNG_MNG_FEATURES_SUPPORTED
-extern PNG_EXPORT(png_uint_32,png_permit_mng_features) PNGARG((png_structp
-   png_ptr, png_uint_32 mng_features_permitted));
-#endif
-
-/* For use in png_set_keep_unknown, added to version 1.2.6 */
-#define PNG_HANDLE_CHUNK_AS_DEFAULT   0
-#define PNG_HANDLE_CHUNK_NEVER        1
-#define PNG_HANDLE_CHUNK_IF_SAFE      2
-#define PNG_HANDLE_CHUNK_ALWAYS       3
-
-/* Added to version 1.2.0 */
-#if defined(PNG_ASSEMBLER_CODE_SUPPORTED)
-#if defined(PNG_MMX_CODE_SUPPORTED)
-#define PNG_ASM_FLAG_MMX_SUPPORT_COMPILED  0x01  /* not user-settable */
-#define PNG_ASM_FLAG_MMX_SUPPORT_IN_CPU    0x02  /* not user-settable */
-#define PNG_ASM_FLAG_MMX_READ_COMBINE_ROW  0x04
-#define PNG_ASM_FLAG_MMX_READ_INTERLACE    0x08
-#define PNG_ASM_FLAG_MMX_READ_FILTER_SUB   0x10
-#define PNG_ASM_FLAG_MMX_READ_FILTER_UP    0x20
-#define PNG_ASM_FLAG_MMX_READ_FILTER_AVG   0x40
-#define PNG_ASM_FLAG_MMX_READ_FILTER_PAETH 0x80
-#define PNG_ASM_FLAGS_INITIALIZED          0x80000000  /* not user-settable */
-
-#define PNG_MMX_READ_FLAGS ( PNG_ASM_FLAG_MMX_READ_COMBINE_ROW  \
-                           | PNG_ASM_FLAG_MMX_READ_INTERLACE    \
-                           | 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 )
-#define PNG_MMX_WRITE_FLAGS ( 0 )
-
-#define PNG_MMX_FLAGS ( PNG_ASM_FLAG_MMX_SUPPORT_COMPILED \
-                      | PNG_ASM_FLAG_MMX_SUPPORT_IN_CPU   \
-                      | PNG_MMX_READ_FLAGS                \
-                      | PNG_MMX_WRITE_FLAGS )
-
-#define PNG_SELECT_READ   1
-#define PNG_SELECT_WRITE  2
-#endif /* PNG_MMX_CODE_SUPPORTED */
-
-#if !defined(PNG_1_0_X)
-/* pngget.c */
-extern PNG_EXPORT(png_uint_32,png_get_mmx_flagmask)
-   PNGARG((int flag_select, int *compilerID));
-
-/* pngget.c */
-extern PNG_EXPORT(png_uint_32,png_get_asm_flagmask)
-   PNGARG((int flag_select));
-
-/* pngget.c */
-extern PNG_EXPORT(png_uint_32,png_get_asm_flags)
-   PNGARG((png_structp png_ptr));
-
-/* pngget.c */
-extern PNG_EXPORT(png_byte,png_get_mmx_bitdepth_threshold)
-   PNGARG((png_structp png_ptr));
-
-/* pngget.c */
-extern PNG_EXPORT(png_uint_32,png_get_mmx_rowbytes_threshold)
-   PNGARG((png_structp png_ptr));
-
-/* pngset.c */
-extern PNG_EXPORT(void,png_set_asm_flags)
-   PNGARG((png_structp png_ptr, png_uint_32 asm_flags));
-
-/* pngset.c */
-extern PNG_EXPORT(void,png_set_mmx_thresholds)
-   PNGARG((png_structp png_ptr, png_byte mmx_bitdepth_threshold,
-   png_uint_32 mmx_rowbytes_threshold));
-
-#endif /* PNG_1_0_X */
-
-#if !defined(PNG_1_0_X)
-/* png.c, pnggccrd.c, or pngvcrd.c */
-extern PNG_EXPORT(int,png_mmx_support) PNGARG((void));
-#endif /* PNG_ASSEMBLER_CODE_SUPPORTED */
-
-/* Strip the prepended error numbers ("#nnn ") from error and warning
- * messages before passing them to the error or warning handler. */
-#ifdef PNG_ERROR_NUMBERS_SUPPORTED
-extern PNG_EXPORT(void,png_set_strip_error_numbers) PNGARG((png_structp
-   png_ptr, png_uint_32 strip_mode));
-#endif
-
-#endif /* PNG_1_0_X */
-
-/* Added at libpng-1.2.6 */
-#ifdef PNG_SET_USER_LIMITS_SUPPORTED
-extern PNG_EXPORT(void,png_set_user_limits) PNGARG((png_structp
-   png_ptr, png_uint_32 user_width_max, png_uint_32 user_height_max));
-extern PNG_EXPORT(png_uint_32,png_get_user_width_max) PNGARG((png_structp
-   png_ptr));
-extern PNG_EXPORT(png_uint_32,png_get_user_height_max) PNGARG((png_structp
-   png_ptr));
-#endif
-
-/* Maintainer: Put new public prototypes here ^, in libpng.3, and project defs */
-
-#ifdef PNG_READ_COMPOSITE_NODIV_SUPPORTED
-/* With these routines we avoid an integer divide, which will be slower on
- * most machines.  However, it does take more operations than the corresponding
- * divide method, so it may be slower on a few RISC systems.  There are two
- * shifts (by 8 or 16 bits) and an addition, versus a single integer divide.
- *
- * Note that the rounding factors are NOT supposed to be the same!  128 and
- * 32768 are correct for the NODIV code; 127 and 32767 are correct for the
- * standard method.
- *
- * [Optimized code by Greg Roelofs and Mark Adler...blame us for bugs. :-) ]
- */
-
- /* fg and bg should be in `gamma 1.0' space; alpha is the opacity          */
-
-#  define png_composite(composite, fg, alpha, bg)                            \
-     { png_uint_16 temp = (png_uint_16)((png_uint_16)(fg) * (png_uint_16)(alpha) \
-                        +        (png_uint_16)(bg)*(png_uint_16)(255 -       \
-                        (png_uint_16)(alpha)) + (png_uint_16)128);           \
-       (composite) = (png_byte)((temp + (temp >> 8)) >> 8); }
-
-#  define png_composite_16(composite, fg, alpha, bg)                         \
-     { png_uint_32 temp = (png_uint_32)((png_uint_32)(fg) * (png_uint_32)(alpha) \
-                        + (png_uint_32)(bg)*(png_uint_32)(65535L -           \
-                        (png_uint_32)(alpha)) + (png_uint_32)32768L);        \
-       (composite) = (png_uint_16)((temp + (temp >> 16)) >> 16); }
-
-#else  /* standard method using integer division */
-
-#  define png_composite(composite, fg, alpha, bg)                            \
-     (composite) = (png_byte)(((png_uint_16)(fg) * (png_uint_16)(alpha) +    \
-       (png_uint_16)(bg) * (png_uint_16)(255 - (png_uint_16)(alpha)) +       \
-       (png_uint_16)127) / 255)
-
-#  define png_composite_16(composite, fg, alpha, bg)                         \
-     (composite) = (png_uint_16)(((png_uint_32)(fg) * (png_uint_32)(alpha) + \
-       (png_uint_32)(bg)*(png_uint_32)(65535L - (png_uint_32)(alpha)) +      \
-       (png_uint_32)32767) / (png_uint_32)65535L)
-
-#endif /* PNG_READ_COMPOSITE_NODIV_SUPPORTED */
-
-/* Inline macros to do direct reads of bytes from the input buffer.  These
- * require that you are using an architecture that uses PNG byte ordering
- * (MSB first) and supports unaligned data storage.  I think that PowerPC
- * in big-endian mode and 680x0 are the only ones that will support this.
- * The x86 line of processors definitely do not.  The png_get_int_32()
- * routine also assumes we are using two's complement format for negative
- * values, which is almost certainly true.
- */
-#if defined(PNG_READ_BIG_ENDIAN_SUPPORTED)
-#  define png_get_uint_32(buf) ( *((png_uint_32p) (buf)))
-#  define png_get_uint_16(buf) ( *((png_uint_16p) (buf)))
-#  define png_get_int_32(buf)  ( *((png_int_32p)  (buf)))
-#else
-extern PNG_EXPORT(png_uint_32,png_get_uint_32) PNGARG((png_bytep buf));
-extern PNG_EXPORT(png_uint_16,png_get_uint_16) PNGARG((png_bytep buf));
-extern PNG_EXPORT(png_int_32,png_get_int_32) PNGARG((png_bytep buf));
-#endif /* !PNG_READ_BIG_ENDIAN_SUPPORTED */
-extern PNG_EXPORT(png_uint_32,png_get_uint_31)
-  PNGARG((png_structp png_ptr, png_bytep buf));
-/* No png_get_int_16 -- may be added if there's a real need for it. */
-
-/* Place a 32-bit number into a buffer in PNG byte order (big-endian).
- */
-extern PNG_EXPORT(void,png_save_uint_32)
-   PNGARG((png_bytep buf, png_uint_32 i));
-extern PNG_EXPORT(void,png_save_int_32)
-   PNGARG((png_bytep buf, png_int_32 i));
-
-/* Place a 16-bit number into a buffer in PNG byte order.
- * The parameter is declared unsigned int, not png_uint_16,
- * just to avoid potential problems on pre-ANSI C compilers.
- */
-extern PNG_EXPORT(void,png_save_uint_16)
-   PNGARG((png_bytep buf, unsigned int i));
-/* No png_save_int_16 -- may be added if there's a real need for it. */
-
-/* ************************************************************************* */
-
-/* These next functions are used internally in the code.  They generally
- * shouldn't be used unless you are writing code to add or replace some
- * functionality in libpng.  More information about most functions can
- * be found in the files where the functions are located.
- */
-
-
-/* Various modes of operation, that are visible to applications because
- * they are used for unknown chunk location.
- */
-#define PNG_HAVE_IHDR               0x01
-#define PNG_HAVE_PLTE               0x02
-#define PNG_HAVE_IDAT               0x04
-#define PNG_AFTER_IDAT              0x08 /* Have complete zlib datastream */
-#define PNG_HAVE_IEND               0x10
-
-#if defined(PNG_INTERNAL)
-
-/* More modes of operation.  Note that after an init, mode is set to
- * zero automatically when the structure is created.
- */
-#define PNG_HAVE_gAMA               0x20
-#define PNG_HAVE_cHRM               0x40
-#define PNG_HAVE_sRGB               0x80
-#define PNG_HAVE_CHUNK_HEADER      0x100
-#define PNG_WROTE_tIME             0x200
-#define PNG_WROTE_INFO_BEFORE_PLTE 0x400
-#define PNG_BACKGROUND_IS_GRAY     0x800
-#define PNG_HAVE_PNG_SIGNATURE    0x1000
-#define PNG_HAVE_CHUNK_AFTER_IDAT 0x2000 /* Have another chunk after IDAT */
-
-/* flags for the transformations the PNG library does on the image data */
-#define PNG_BGR                0x0001
-#define PNG_INTERLACE          0x0002
-#define PNG_PACK               0x0004
-#define PNG_SHIFT              0x0008
-#define PNG_SWAP_BYTES         0x0010
-#define PNG_INVERT_MONO        0x0020
-#define PNG_DITHER             0x0040
-#define PNG_BACKGROUND         0x0080
-#define PNG_BACKGROUND_EXPAND  0x0100
-                          /*   0x0200 unused */
-#define PNG_16_TO_8            0x0400
-#define PNG_RGBA               0x0800
-#define PNG_EXPAND             0x1000
-#define PNG_GAMMA              0x2000
-#define PNG_GRAY_TO_RGB        0x4000
-#define PNG_FILLER             0x8000L
-#define PNG_PACKSWAP          0x10000L
-#define PNG_SWAP_ALPHA        0x20000L
-#define PNG_STRIP_ALPHA       0x40000L
-#define PNG_INVERT_ALPHA      0x80000L
-#define PNG_USER_TRANSFORM   0x100000L
-#define PNG_RGB_TO_GRAY_ERR  0x200000L
-#define PNG_RGB_TO_GRAY_WARN 0x400000L
-#define PNG_RGB_TO_GRAY      0x600000L  /* two bits, RGB_TO_GRAY_ERR|WARN */
-                       /*    0x800000L     Unused */
-#define PNG_ADD_ALPHA       0x1000000L  /* Added to libpng-1.2.7 */
-#define PNG_EXPAND_tRNS     0x2000000L  /* Added to libpng-1.2.9 */
-                       /*   0x4000000L  unused */
-                       /*   0x8000000L  unused */
-                       /*  0x10000000L  unused */
-                       /*  0x20000000L  unused */
-                       /*  0x40000000L  unused */
-
-/* flags for png_create_struct */
-#define PNG_STRUCT_PNG   0x0001
-#define PNG_STRUCT_INFO  0x0002
-
-/* Scaling factor for filter heuristic weighting calculations */
-#define PNG_WEIGHT_SHIFT 8
-#define PNG_WEIGHT_FACTOR (1<<(PNG_WEIGHT_SHIFT))
-#define PNG_COST_SHIFT 3
-#define PNG_COST_FACTOR (1<<(PNG_COST_SHIFT))
-
-/* flags for the png_ptr->flags rather than declaring a byte for each one */
-#define PNG_FLAG_ZLIB_CUSTOM_STRATEGY     0x0001
-#define PNG_FLAG_ZLIB_CUSTOM_LEVEL        0x0002
-#define PNG_FLAG_ZLIB_CUSTOM_MEM_LEVEL    0x0004
-#define PNG_FLAG_ZLIB_CUSTOM_WINDOW_BITS  0x0008
-#define PNG_FLAG_ZLIB_CUSTOM_METHOD       0x0010
-#define PNG_FLAG_ZLIB_FINISHED            0x0020
-#define PNG_FLAG_ROW_INIT                 0x0040
-#define PNG_FLAG_FILLER_AFTER             0x0080
-#define PNG_FLAG_CRC_ANCILLARY_USE        0x0100
-#define PNG_FLAG_CRC_ANCILLARY_NOWARN     0x0200
-#define PNG_FLAG_CRC_CRITICAL_USE         0x0400
-#define PNG_FLAG_CRC_CRITICAL_IGNORE      0x0800
-#define PNG_FLAG_FREE_PLTE                0x1000
-#define PNG_FLAG_FREE_TRNS                0x2000
-#define PNG_FLAG_FREE_HIST                0x4000
-#define PNG_FLAG_KEEP_UNKNOWN_CHUNKS      0x8000L
-#define PNG_FLAG_KEEP_UNSAFE_CHUNKS       0x10000L
-#define PNG_FLAG_LIBRARY_MISMATCH         0x20000L
-#define PNG_FLAG_STRIP_ERROR_NUMBERS      0x40000L
-#define PNG_FLAG_STRIP_ERROR_TEXT         0x80000L
-#define PNG_FLAG_MALLOC_NULL_MEM_OK       0x100000L
-#define PNG_FLAG_ADD_ALPHA                0x200000L  /* Added to libpng-1.2.8 */
-#define PNG_FLAG_STRIP_ALPHA              0x400000L  /* Added to libpng-1.2.8 */
-                                  /*      0x800000L  unused */
-                                  /*     0x1000000L  unused */
-                                  /*     0x2000000L  unused */
-                                  /*     0x4000000L  unused */
-                                  /*     0x8000000L  unused */
-                                  /*    0x10000000L  unused */
-                                  /*    0x20000000L  unused */
-                                  /*    0x40000000L  unused */
-
-#define PNG_FLAG_CRC_ANCILLARY_MASK (PNG_FLAG_CRC_ANCILLARY_USE | \
-                                     PNG_FLAG_CRC_ANCILLARY_NOWARN)
-
-#define PNG_FLAG_CRC_CRITICAL_MASK  (PNG_FLAG_CRC_CRITICAL_USE | \
-                                     PNG_FLAG_CRC_CRITICAL_IGNORE)
-
-#define PNG_FLAG_CRC_MASK           (PNG_FLAG_CRC_ANCILLARY_MASK | \
-                                     PNG_FLAG_CRC_CRITICAL_MASK)
-
-/* save typing and make code easier to understand */
-
-#define PNG_COLOR_DIST(c1, c2) (abs((int)((c1).red) - (int)((c2).red)) + \
-   abs((int)((c1).green) - (int)((c2).green)) + \
-   abs((int)((c1).blue) - (int)((c2).blue)))
-
-/* Added to libpng-1.2.6 JB */
-#define PNG_ROWBYTES(pixel_bits, width) \
-    ((pixel_bits) >= 8 ? \
-    ((width) * (((png_uint_32)(pixel_bits)) >> 3)) : \
-    (( ((width) * ((png_uint_32)(pixel_bits))) + 7) >> 3) )
-
-/* PNG_OUT_OF_RANGE returns true if value is outside the range
-   ideal-delta..ideal+delta.  Each argument is evaluated twice.
-   "ideal" and "delta" should be constants, normally simple
-   integers, "value" a variable. Added to libpng-1.2.6 JB */
-#define PNG_OUT_OF_RANGE(value, ideal, delta) \
-        ( (value) < (ideal)-(delta) || (value) > (ideal)+(delta) )
-
-/* variables declared in png.c - only it needs to define PNG_NO_EXTERN */
-#if !defined(PNG_NO_EXTERN) || defined(PNG_ALWAYS_EXTERN)
-/* place to hold the signature string for a PNG file. */
-#ifdef PNG_USE_GLOBAL_ARRAYS
-   PNG_EXPORT_VAR (PNG_CONST png_byte FARDATA) png_sig[8];
-#else
-#endif
-#endif /* PNG_NO_EXTERN */
-
-/* Constant strings for known chunk types.  If you need to add a chunk,
- * define the name here, and add an invocation of the macro in png.c and
- * wherever it's needed.
- */
-#define PNG_IHDR png_byte png_IHDR[5] = { 73,  72,  68,  82, '\0'}
-#define PNG_IDAT png_byte png_IDAT[5] = { 73,  68,  65,  84, '\0'}
-#define PNG_IEND png_byte png_IEND[5] = { 73,  69,  78,  68, '\0'}
-#define PNG_PLTE png_byte png_PLTE[5] = { 80,  76,  84,  69, '\0'}
-#define PNG_bKGD png_byte png_bKGD[5] = { 98,  75,  71,  68, '\0'}
-#define PNG_cHRM png_byte png_cHRM[5] = { 99,  72,  82,  77, '\0'}
-#define PNG_gAMA png_byte png_gAMA[5] = {103,  65,  77,  65, '\0'}
-#define PNG_hIST png_byte png_hIST[5] = {104,  73,  83,  84, '\0'}
-#define PNG_iCCP png_byte png_iCCP[5] = {105,  67,  67,  80, '\0'}
-#define PNG_iTXt png_byte png_iTXt[5] = {105,  84,  88, 116, '\0'}
-#define PNG_oFFs png_byte png_oFFs[5] = {111,  70,  70, 115, '\0'}
-#define PNG_pCAL png_byte png_pCAL[5] = {112,  67,  65,  76, '\0'}
-#define PNG_sCAL png_byte png_sCAL[5] = {115,  67,  65,  76, '\0'}
-#define PNG_pHYs png_byte png_pHYs[5] = {112,  72,  89, 115, '\0'}
-#define PNG_sBIT png_byte png_sBIT[5] = {115,  66,  73,  84, '\0'}
-#define PNG_sPLT png_byte png_sPLT[5] = {115,  80,  76,  84, '\0'}
-#define PNG_sRGB png_byte png_sRGB[5] = {115,  82,  71,  66, '\0'}
-#define PNG_tEXt png_byte png_tEXt[5] = {116,  69,  88, 116, '\0'}
-#define PNG_tIME png_byte png_tIME[5] = {116,  73,  77,  69, '\0'}
-#define PNG_tRNS png_byte png_tRNS[5] = {116,  82,  78,  83, '\0'}
-#define PNG_zTXt png_byte png_zTXt[5] = {122,  84,  88, 116, '\0'}
-
-#ifdef PNG_USE_GLOBAL_ARRAYS
-PNG_EXPORT_VAR (png_byte FARDATA) png_IHDR[5];
-PNG_EXPORT_VAR (png_byte FARDATA) png_IDAT[5];
-PNG_EXPORT_VAR (png_byte FARDATA) png_IEND[5];
-PNG_EXPORT_VAR (png_byte FARDATA) png_PLTE[5];
-PNG_EXPORT_VAR (png_byte FARDATA) png_bKGD[5];
-PNG_EXPORT_VAR (png_byte FARDATA) png_cHRM[5];
-PNG_EXPORT_VAR (png_byte FARDATA) png_gAMA[5];
-PNG_EXPORT_VAR (png_byte FARDATA) png_hIST[5];
-PNG_EXPORT_VAR (png_byte FARDATA) png_iCCP[5];
-PNG_EXPORT_VAR (png_byte FARDATA) png_iTXt[5];
-PNG_EXPORT_VAR (png_byte FARDATA) png_oFFs[5];
-PNG_EXPORT_VAR (png_byte FARDATA) png_pCAL[5];
-PNG_EXPORT_VAR (png_byte FARDATA) png_sCAL[5];
-PNG_EXPORT_VAR (png_byte FARDATA) png_pHYs[5];
-PNG_EXPORT_VAR (png_byte FARDATA) png_sBIT[5];
-PNG_EXPORT_VAR (png_byte FARDATA) png_sPLT[5];
-PNG_EXPORT_VAR (png_byte FARDATA) png_sRGB[5];
-PNG_EXPORT_VAR (png_byte FARDATA) png_tEXt[5];
-PNG_EXPORT_VAR (png_byte FARDATA) png_tIME[5];
-PNG_EXPORT_VAR (png_byte FARDATA) png_tRNS[5];
-PNG_EXPORT_VAR (png_byte FARDATA) png_zTXt[5];
-#endif /* PNG_USE_GLOBAL_ARRAYS */
-
-#if defined(PNG_1_0_X) || defined (PNG_1_2_X)
-/* Initialize png_ptr struct for reading, and allocate any other memory.
- * (old interface - DEPRECATED - use png_create_read_struct instead).
- */
-extern PNG_EXPORT(void,png_read_init) PNGARG((png_structp png_ptr));
-#undef png_read_init
-#define png_read_init(png_ptr) png_read_init_3(&png_ptr, \
-    PNG_LIBPNG_VER_STRING,  png_sizeof(png_struct));
-#endif
-
-extern PNG_EXPORT(void,png_read_init_3) PNGARG((png_structpp ptr_ptr,
-    png_const_charp user_png_ver, png_size_t png_struct_size));
-#if defined(PNG_1_0_X) || defined (PNG_1_2_X)
-extern PNG_EXPORT(void,png_read_init_2) PNGARG((png_structp png_ptr,
-    png_const_charp user_png_ver, png_size_t png_struct_size, png_size_t
-    png_info_size));
-#endif
-
-#if defined(PNG_1_0_X) || defined (PNG_1_2_X)
-/* Initialize png_ptr struct for writing, and allocate any other memory.
- * (old interface - DEPRECATED - use png_create_write_struct instead).
- */
-extern PNG_EXPORT(void,png_write_init) PNGARG((png_structp png_ptr));
-#undef png_write_init
-#define png_write_init(png_ptr) png_write_init_3(&png_ptr, \
-    PNG_LIBPNG_VER_STRING, png_sizeof(png_struct));
-#endif
-
-extern PNG_EXPORT(void,png_write_init_3) PNGARG((png_structpp ptr_ptr,
-    png_const_charp user_png_ver, png_size_t png_struct_size));
-extern PNG_EXPORT(void,png_write_init_2) PNGARG((png_structp png_ptr,
-    png_const_charp user_png_ver, png_size_t png_struct_size, png_size_t
-    png_info_size));
-
-/* Allocate memory for an internal libpng struct */
-PNG_EXTERN png_voidp png_create_struct PNGARG((int type));
-
-/* Free memory from internal libpng struct */
-PNG_EXTERN void png_destroy_struct PNGARG((png_voidp struct_ptr));
-
-PNG_EXTERN png_voidp png_create_struct_2 PNGARG((int type, png_malloc_ptr
-  malloc_fn, png_voidp mem_ptr));
-PNG_EXTERN void png_destroy_struct_2 PNGARG((png_voidp struct_ptr,
-   png_free_ptr free_fn, png_voidp mem_ptr));
-
-/* Free any memory that info_ptr points to and reset struct. */
-PNG_EXTERN void png_info_destroy PNGARG((png_structp png_ptr,
-   png_infop info_ptr));
-
-#ifndef PNG_1_0_X
-/* Function to allocate memory for zlib. */
-PNG_EXTERN voidpf png_zalloc PNGARG((voidpf png_ptr, uInt items, uInt size));
-
-/* Function to free memory for zlib */
-PNG_EXTERN void png_zfree PNGARG((voidpf png_ptr, voidpf ptr));
-
-#ifdef PNG_SIZE_T
-/* Function to convert a sizeof an item to png_sizeof item */
-   PNG_EXTERN png_size_t PNGAPI png_convert_size PNGARG((size_t size));
-#endif
-
-/* Next four functions are used internally as callbacks.  PNGAPI is required
- * but not PNG_EXPORT.  PNGAPI added at libpng version 1.2.3. */
-
-PNG_EXTERN void PNGAPI png_default_read_data PNGARG((png_structp png_ptr,
-   png_bytep data, png_size_t length));
-
-#ifdef PNG_PROGRESSIVE_READ_SUPPORTED
-PNG_EXTERN void PNGAPI png_push_fill_buffer PNGARG((png_structp png_ptr,
-   png_bytep buffer, png_size_t length));
-#endif
-
-PNG_EXTERN void PNGAPI png_default_write_data PNGARG((png_structp png_ptr,
-   png_bytep data, png_size_t length));
-
-#if defined(PNG_WRITE_FLUSH_SUPPORTED)
-#if !defined(PNG_NO_STDIO)
-PNG_EXTERN void PNGAPI png_default_flush PNGARG((png_structp png_ptr));
-#endif
-#endif
-#else /* PNG_1_0_X */
-#ifdef PNG_PROGRESSIVE_READ_SUPPORTED
-PNG_EXTERN void png_push_fill_buffer PNGARG((png_structp png_ptr,
-   png_bytep buffer, png_size_t length));
-#endif
-#endif /* PNG_1_0_X */
-
-/* Reset the CRC variable */
-PNG_EXTERN void png_reset_crc PNGARG((png_structp png_ptr));
-
-/* Write the "data" buffer to whatever output you are using. */
-PNG_EXTERN void png_write_data PNGARG((png_structp png_ptr, png_bytep data,
-   png_size_t length));
-
-/* Read data from whatever input you are using into the "data" buffer */
-PNG_EXTERN void png_read_data PNGARG((png_structp png_ptr, png_bytep data,
-   png_size_t length));
-
-/* Read bytes into buf, and update png_ptr->crc */
-PNG_EXTERN void png_crc_read PNGARG((png_structp png_ptr, png_bytep buf,
-   png_size_t length));
-
-/* Decompress data in a chunk that uses compression */
-#if defined(PNG_zTXt_SUPPORTED) || defined(PNG_iTXt_SUPPORTED) || \
-    defined(PNG_iCCP_SUPPORTED) || defined(PNG_sPLT_SUPPORTED)
-PNG_EXTERN png_charp png_decompress_chunk PNGARG((png_structp png_ptr,
-   int comp_type, png_charp chunkdata, png_size_t chunklength,
-   png_size_t prefix_length, png_size_t *data_length));
-#endif
-
-/* Read "skip" bytes, read the file crc, and (optionally) verify png_ptr->crc */
-PNG_EXTERN int png_crc_finish PNGARG((png_structp png_ptr, png_uint_32 skip));
-
-/* Read the CRC from the file and compare it to the libpng calculated CRC */
-PNG_EXTERN int png_crc_error PNGARG((png_structp png_ptr));
-
-/* Calculate the CRC over a section of data.  Note that we are only
- * passing a maximum of 64K on systems that have this as a memory limit,
- * since this is the maximum buffer size we can specify.
- */
-PNG_EXTERN void png_calculate_crc PNGARG((png_structp png_ptr, png_bytep ptr,
-   png_size_t length));
-
-#if defined(PNG_WRITE_FLUSH_SUPPORTED)
-PNG_EXTERN void png_flush PNGARG((png_structp png_ptr));
-#endif
-
-/* simple function to write the signature */
-PNG_EXTERN void png_write_sig PNGARG((png_structp png_ptr));
-
-/* write various chunks */
-
-/* Write the IHDR chunk, and update the png_struct with the necessary
- * information.
- */
-PNG_EXTERN void png_write_IHDR PNGARG((png_structp png_ptr, png_uint_32 width,
-   png_uint_32 height,
-   int bit_depth, int color_type, int compression_method, int filter_method,
-   int interlace_method));
-
-PNG_EXTERN void png_write_PLTE PNGARG((png_structp png_ptr, png_colorp palette,
-   png_uint_32 num_pal));
-
-PNG_EXTERN void png_write_IDAT PNGARG((png_structp png_ptr, png_bytep data,
-   png_size_t length));
-
-PNG_EXTERN void png_write_IEND PNGARG((png_structp png_ptr));
-
-#if defined(PNG_WRITE_gAMA_SUPPORTED)
-#ifdef PNG_FLOATING_POINT_SUPPORTED
-PNG_EXTERN void png_write_gAMA PNGARG((png_structp png_ptr, double file_gamma));
-#endif
-#ifdef PNG_FIXED_POINT_SUPPORTED
-PNG_EXTERN void png_write_gAMA_fixed PNGARG((png_structp png_ptr, png_fixed_point
-    file_gamma));
-#endif
-#endif
-
-#if defined(PNG_WRITE_sBIT_SUPPORTED)
-PNG_EXTERN void png_write_sBIT PNGARG((png_structp png_ptr, png_color_8p sbit,
-   int color_type));
-#endif
-
-#if defined(PNG_WRITE_cHRM_SUPPORTED)
-#ifdef PNG_FLOATING_POINT_SUPPORTED
-PNG_EXTERN void png_write_cHRM PNGARG((png_structp png_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
-PNG_EXTERN void png_write_cHRM_fixed PNGARG((png_structp png_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_WRITE_sRGB_SUPPORTED)
-PNG_EXTERN void png_write_sRGB PNGARG((png_structp png_ptr,
-   int intent));
-#endif
-
-#if defined(PNG_WRITE_iCCP_SUPPORTED)
-PNG_EXTERN void png_write_iCCP PNGARG((png_structp png_ptr,
-   png_charp name, int compression_type,
-   png_charp profile, int proflen));
-   /* Note to maintainer: profile should be png_bytep */
-#endif
-
-#if defined(PNG_WRITE_sPLT_SUPPORTED)
-PNG_EXTERN void png_write_sPLT PNGARG((png_structp png_ptr,
-   png_sPLT_tp palette));
-#endif
-
-#if defined(PNG_WRITE_tRNS_SUPPORTED)
-PNG_EXTERN void png_write_tRNS PNGARG((png_structp png_ptr, png_bytep trans,
-   png_color_16p values, int number, int color_type));
-#endif
-
-#if defined(PNG_WRITE_bKGD_SUPPORTED)
-PNG_EXTERN void png_write_bKGD PNGARG((png_structp png_ptr,
-   png_color_16p values, int color_type));
-#endif
-
-#if defined(PNG_WRITE_hIST_SUPPORTED)
-PNG_EXTERN void png_write_hIST PNGARG((png_structp png_ptr, png_uint_16p hist,
-   int num_hist));
-#endif
-
-#if defined(PNG_WRITE_TEXT_SUPPORTED) || defined(PNG_WRITE_pCAL_SUPPORTED) || \
-    defined(PNG_WRITE_iCCP_SUPPORTED) || defined(PNG_WRITE_sPLT_SUPPORTED)
-PNG_EXTERN png_size_t png_check_keyword PNGARG((png_structp png_ptr,
-   png_charp key, png_charpp new_key));
-#endif
-
-#if defined(PNG_WRITE_tEXt_SUPPORTED)
-PNG_EXTERN void png_write_tEXt PNGARG((png_structp png_ptr, png_charp key,
-   png_charp text, png_size_t text_len));
-#endif
-
-#if defined(PNG_WRITE_zTXt_SUPPORTED)
-PNG_EXTERN void png_write_zTXt PNGARG((png_structp png_ptr, png_charp key,
-   png_charp text, png_size_t text_len, int compression));
-#endif
-
-#if defined(PNG_WRITE_iTXt_SUPPORTED)
-PNG_EXTERN void png_write_iTXt PNGARG((png_structp png_ptr,
-   int compression, png_charp key, png_charp lang, png_charp lang_key,
-   png_charp text));
-#endif
-
-#if defined(PNG_TEXT_SUPPORTED)  /* Added at version 1.0.14 and 1.2.4 */
-PNG_EXTERN int png_set_text_2 PNGARG((png_structp png_ptr,
-   png_infop info_ptr, png_textp text_ptr, int num_text));
-#endif
-
-#if defined(PNG_WRITE_oFFs_SUPPORTED)
-PNG_EXTERN void png_write_oFFs PNGARG((png_structp png_ptr,
-   png_int_32 x_offset, png_int_32 y_offset, int unit_type));
-#endif
-
-#if defined(PNG_WRITE_pCAL_SUPPORTED)
-PNG_EXTERN void png_write_pCAL PNGARG((png_structp png_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_WRITE_pHYs_SUPPORTED)
-PNG_EXTERN void png_write_pHYs PNGARG((png_structp png_ptr,
-   png_uint_32 x_pixels_per_unit, png_uint_32 y_pixels_per_unit,
-   int unit_type));
-#endif
-
-#if defined(PNG_WRITE_tIME_SUPPORTED)
-PNG_EXTERN void png_write_tIME PNGARG((png_structp png_ptr,
-   png_timep mod_time));
-#endif
-
-#if defined(PNG_WRITE_sCAL_SUPPORTED)
-#if defined(PNG_FLOATING_POINT_SUPPORTED) && !defined(PNG_NO_STDIO)
-PNG_EXTERN void png_write_sCAL PNGARG((png_structp png_ptr,
-   int unit, double width, double height));
-#else
-#ifdef PNG_FIXED_POINT_SUPPORTED
-PNG_EXTERN void png_write_sCAL_s PNGARG((png_structp png_ptr,
-   int unit, png_charp width, png_charp height));
-#endif
-#endif
-#endif
-
-/* Called when finished processing a row of data */
-PNG_EXTERN void png_write_finish_row PNGARG((png_structp png_ptr));
-
-/* Internal use only.   Called before first row of data */
-PNG_EXTERN void png_write_start_row PNGARG((png_structp png_ptr));
-
-#if defined(PNG_READ_GAMMA_SUPPORTED)
-PNG_EXTERN void png_build_gamma_table PNGARG((png_structp png_ptr));
-#endif
-
-/* combine a row of data, dealing with alpha, etc. if requested */
-PNG_EXTERN void png_combine_row PNGARG((png_structp png_ptr, png_bytep row,
-   int mask));
-
-#if defined(PNG_READ_INTERLACING_SUPPORTED)
-/* expand an interlaced row */
-/* OLD pre-1.0.9 interface:
-PNG_EXTERN void png_do_read_interlace PNGARG((png_row_infop row_info,
-   png_bytep row, int pass, png_uint_32 transformations));
- */
-PNG_EXTERN void png_do_read_interlace PNGARG((png_structp png_ptr));
-#endif
-
-/* GRR TO DO (2.0 or whenever):  simplify other internal calling interfaces */
-
-#if defined(PNG_WRITE_INTERLACING_SUPPORTED)
-/* grab pixels out of a row for an interlaced pass */
-PNG_EXTERN void png_do_write_interlace PNGARG((png_row_infop row_info,
-   png_bytep row, int pass));
-#endif
-
-/* unfilter a row */
-PNG_EXTERN void png_read_filter_row PNGARG((png_structp png_ptr,
-   png_row_infop row_info, png_bytep row, png_bytep prev_row, int filter));
-
-/* Choose the best filter to use and filter the row data */
-PNG_EXTERN void png_write_find_filter PNGARG((png_structp png_ptr,
-   png_row_infop row_info));
-
-/* Write out the filtered row. */
-PNG_EXTERN void png_write_filtered_row PNGARG((png_structp png_ptr,
-   png_bytep filtered_row));
-/* finish a row while reading, dealing with interlacing passes, etc. */
-PNG_EXTERN void png_read_finish_row PNGARG((png_structp png_ptr));
-
-/* initialize the row buffers, etc. */
-PNG_EXTERN void png_read_start_row PNGARG((png_structp png_ptr));
-/* optional call to update the users info structure */
-PNG_EXTERN void png_read_transform_info PNGARG((png_structp png_ptr,
-   png_infop info_ptr));
-
-/* these are the functions that do the transformations */
-#if defined(PNG_READ_FILLER_SUPPORTED)
-PNG_EXTERN void png_do_read_filler PNGARG((png_row_infop row_info,
-   png_bytep row, png_uint_32 filler, png_uint_32 flags));
-#endif
-
-#if defined(PNG_READ_SWAP_ALPHA_SUPPORTED)
-PNG_EXTERN void png_do_read_swap_alpha PNGARG((png_row_infop row_info,
-   png_bytep row));
-#endif
-
-#if defined(PNG_WRITE_SWAP_ALPHA_SUPPORTED)
-PNG_EXTERN void png_do_write_swap_alpha PNGARG((png_row_infop row_info,
-   png_bytep row));
-#endif
-
-#if defined(PNG_READ_INVERT_ALPHA_SUPPORTED)
-PNG_EXTERN void png_do_read_invert_alpha PNGARG((png_row_infop row_info,
-   png_bytep row));
-#endif
-
-#if defined(PNG_WRITE_INVERT_ALPHA_SUPPORTED)
-PNG_EXTERN void png_do_write_invert_alpha PNGARG((png_row_infop row_info,
-   png_bytep row));
-#endif
-
-#if defined(PNG_WRITE_FILLER_SUPPORTED) || \
-    defined(PNG_READ_STRIP_ALPHA_SUPPORTED)
-PNG_EXTERN void png_do_strip_filler PNGARG((png_row_infop row_info,
-   png_bytep row, png_uint_32 flags));
-#endif
-
-#if defined(PNG_READ_SWAP_SUPPORTED) || defined(PNG_WRITE_SWAP_SUPPORTED)
-PNG_EXTERN void png_do_swap PNGARG((png_row_infop row_info, png_bytep row));
-#endif
-
-#if defined(PNG_READ_PACKSWAP_SUPPORTED) || defined(PNG_WRITE_PACKSWAP_SUPPORTED)
-PNG_EXTERN void png_do_packswap PNGARG((png_row_infop row_info, png_bytep row));
-#endif
-
-#if defined(PNG_READ_RGB_TO_GRAY_SUPPORTED)
-PNG_EXTERN int png_do_rgb_to_gray PNGARG((png_structp png_ptr, png_row_infop
-   row_info, png_bytep row));
-#endif
-
-#if defined(PNG_READ_GRAY_TO_RGB_SUPPORTED)
-PNG_EXTERN void png_do_gray_to_rgb PNGARG((png_row_infop row_info,
-   png_bytep row));
-#endif
-
-#if defined(PNG_READ_PACK_SUPPORTED)
-PNG_EXTERN void png_do_unpack PNGARG((png_row_infop row_info, png_bytep row));
-#endif
-
-#if defined(PNG_READ_SHIFT_SUPPORTED)
-PNG_EXTERN void png_do_unshift PNGARG((png_row_infop row_info, png_bytep row,
-   png_color_8p sig_bits));
-#endif
-
-#if defined(PNG_READ_INVERT_SUPPORTED) || defined(PNG_WRITE_INVERT_SUPPORTED)
-PNG_EXTERN void png_do_invert PNGARG((png_row_infop row_info, png_bytep row));
-#endif
-
-#if defined(PNG_READ_16_TO_8_SUPPORTED)
-PNG_EXTERN void png_do_chop PNGARG((png_row_infop row_info, png_bytep row));
-#endif
-
-#if defined(PNG_READ_DITHER_SUPPORTED)
-PNG_EXTERN void png_do_dither PNGARG((png_row_infop row_info,
-   png_bytep row, png_bytep palette_lookup, png_bytep dither_lookup));
-
-#  if defined(PNG_CORRECT_PALETTE_SUPPORTED)
-PNG_EXTERN void png_correct_palette PNGARG((png_structp png_ptr,
-   png_colorp palette, int num_palette));
-#  endif
-#endif
-
-#if defined(PNG_READ_BGR_SUPPORTED) || defined(PNG_WRITE_BGR_SUPPORTED)
-PNG_EXTERN void png_do_bgr PNGARG((png_row_infop row_info, png_bytep row));
-#endif
-
-#if defined(PNG_WRITE_PACK_SUPPORTED)
-PNG_EXTERN void png_do_pack PNGARG((png_row_infop row_info,
-   png_bytep row, png_uint_32 bit_depth));
-#endif
-
-#if defined(PNG_WRITE_SHIFT_SUPPORTED)
-PNG_EXTERN void png_do_shift PNGARG((png_row_infop row_info, png_bytep row,
-   png_color_8p bit_depth));
-#endif
-
-#if defined(PNG_READ_BACKGROUND_SUPPORTED)
-#if defined(PNG_READ_GAMMA_SUPPORTED)
-PNG_EXTERN void png_do_background PNGARG((png_row_infop row_info, png_bytep row,
-   png_color_16p trans_values, png_color_16p background,
-   png_color_16p background_1,
-   png_bytep gamma_table, png_bytep gamma_from_1, png_bytep gamma_to_1,
-   png_uint_16pp gamma_16, png_uint_16pp gamma_16_from_1,
-   png_uint_16pp gamma_16_to_1, int gamma_shift));
-#else
-PNG_EXTERN void png_do_background PNGARG((png_row_infop row_info, png_bytep row,
-   png_color_16p trans_values, png_color_16p background));
-#endif
-#endif
-
-#if defined(PNG_READ_GAMMA_SUPPORTED)
-PNG_EXTERN void png_do_gamma PNGARG((png_row_infop row_info, png_bytep row,
-   png_bytep gamma_table, png_uint_16pp gamma_16_table,
-   int gamma_shift));
-#endif
-
-#if defined(PNG_READ_EXPAND_SUPPORTED)
-PNG_EXTERN void png_do_expand_palette PNGARG((png_row_infop row_info,
-   png_bytep row, png_colorp palette, png_bytep trans, int num_trans));
-PNG_EXTERN void png_do_expand PNGARG((png_row_infop row_info,
-   png_bytep row, png_color_16p trans_value));
-#endif
-
-/* The following decodes the appropriate chunks, and does error correction,
- * then calls the appropriate callback for the chunk if it is valid.
- */
-
-/* decode the IHDR chunk */
-PNG_EXTERN void png_handle_IHDR PNGARG((png_structp png_ptr, png_infop info_ptr,
-   png_uint_32 length));
-PNG_EXTERN void png_handle_PLTE PNGARG((png_structp png_ptr, png_infop info_ptr,
-   png_uint_32 length));
-PNG_EXTERN void png_handle_IEND PNGARG((png_structp png_ptr, png_infop info_ptr,
-   png_uint_32 length));
-
-#if defined(PNG_READ_bKGD_SUPPORTED)
-PNG_EXTERN void png_handle_bKGD PNGARG((png_structp png_ptr, png_infop info_ptr,
-   png_uint_32 length));
-#endif
-
-#if defined(PNG_READ_cHRM_SUPPORTED)
-PNG_EXTERN void png_handle_cHRM PNGARG((png_structp png_ptr, png_infop info_ptr,
-   png_uint_32 length));
-#endif
-
-#if defined(PNG_READ_gAMA_SUPPORTED)
-PNG_EXTERN void png_handle_gAMA PNGARG((png_structp png_ptr, png_infop info_ptr,
-   png_uint_32 length));
-#endif
-
-#if defined(PNG_READ_hIST_SUPPORTED)
-PNG_EXTERN void png_handle_hIST PNGARG((png_structp png_ptr, png_infop info_ptr,
-   png_uint_32 length));
-#endif
-
-#if defined(PNG_READ_iCCP_SUPPORTED)
-extern void png_handle_iCCP PNGARG((png_structp png_ptr, png_infop info_ptr,
-   png_uint_32 length));
-#endif /* PNG_READ_iCCP_SUPPORTED */
-
-#if defined(PNG_READ_iTXt_SUPPORTED)
-PNG_EXTERN void png_handle_iTXt PNGARG((png_structp png_ptr, png_infop info_ptr,
-   png_uint_32 length));
-#endif
-
-#if defined(PNG_READ_oFFs_SUPPORTED)
-PNG_EXTERN void png_handle_oFFs PNGARG((png_structp png_ptr, png_infop info_ptr,
-   png_uint_32 length));
-#endif
-
-#if defined(PNG_READ_pCAL_SUPPORTED)
-PNG_EXTERN void png_handle_pCAL PNGARG((png_structp png_ptr, png_infop info_ptr,
-   png_uint_32 length));
-#endif
-
-#if defined(PNG_READ_pHYs_SUPPORTED)
-PNG_EXTERN void png_handle_pHYs PNGARG((png_structp png_ptr, png_infop info_ptr,
-   png_uint_32 length));
-#endif
-
-#if defined(PNG_READ_sBIT_SUPPORTED)
-PNG_EXTERN void png_handle_sBIT PNGARG((png_structp png_ptr, png_infop info_ptr,
-   png_uint_32 length));
-#endif
-
-#if defined(PNG_READ_sCAL_SUPPORTED)
-PNG_EXTERN void png_handle_sCAL PNGARG((png_structp png_ptr, png_infop info_ptr,
-   png_uint_32 length));
-#endif
-
-#if defined(PNG_READ_sPLT_SUPPORTED)
-extern void png_handle_sPLT PNGARG((png_structp png_ptr, png_infop info_ptr,
-   png_uint_32 length));
-#endif /* PNG_READ_sPLT_SUPPORTED */
-
-#if defined(PNG_READ_sRGB_SUPPORTED)
-PNG_EXTERN void png_handle_sRGB PNGARG((png_structp png_ptr, png_infop info_ptr,
-   png_uint_32 length));
-#endif
-
-#if defined(PNG_READ_tEXt_SUPPORTED)
-PNG_EXTERN void png_handle_tEXt PNGARG((png_structp png_ptr, png_infop info_ptr,
-   png_uint_32 length));
-#endif
-
-#if defined(PNG_READ_tIME_SUPPORTED)
-PNG_EXTERN void png_handle_tIME PNGARG((png_structp png_ptr, png_infop info_ptr,
-   png_uint_32 length));
-#endif
-
-#if defined(PNG_READ_tRNS_SUPPORTED)
-PNG_EXTERN void png_handle_tRNS PNGARG((png_structp png_ptr, png_infop info_ptr,
-   png_uint_32 length));
-#endif
-
-#if defined(PNG_READ_zTXt_SUPPORTED)
-PNG_EXTERN void png_handle_zTXt PNGARG((png_structp png_ptr, png_infop info_ptr,
-   png_uint_32 length));
-#endif
-
-PNG_EXTERN void png_handle_unknown PNGARG((png_structp png_ptr,
-   png_infop info_ptr, png_uint_32 length));
-
-PNG_EXTERN void png_check_chunk_name PNGARG((png_structp png_ptr,
-   png_bytep chunk_name));
-
-/* handle the transformations for reading and writing */
-PNG_EXTERN void png_do_read_transformations PNGARG((png_structp png_ptr));
-PNG_EXTERN void png_do_write_transformations PNGARG((png_structp png_ptr));
-
-PNG_EXTERN void png_init_read_transformations PNGARG((png_structp png_ptr));
-
-#ifdef PNG_PROGRESSIVE_READ_SUPPORTED
-PNG_EXTERN void png_push_read_chunk PNGARG((png_structp png_ptr,
-   png_infop info_ptr));
-PNG_EXTERN void png_push_read_sig PNGARG((png_structp png_ptr,
-   png_infop info_ptr));
-PNG_EXTERN void png_push_check_crc PNGARG((png_structp png_ptr));
-PNG_EXTERN void png_push_crc_skip PNGARG((png_structp png_ptr,
-   png_uint_32 length));
-PNG_EXTERN void png_push_crc_finish PNGARG((png_structp png_ptr));
-PNG_EXTERN void png_push_save_buffer PNGARG((png_structp png_ptr));
-PNG_EXTERN void png_push_restore_buffer PNGARG((png_structp png_ptr,
-   png_bytep buffer, png_size_t buffer_length));
-PNG_EXTERN void png_push_read_IDAT PNGARG((png_structp png_ptr));
-PNG_EXTERN void png_process_IDAT_data PNGARG((png_structp png_ptr,
-   png_bytep buffer, png_size_t buffer_length));
-PNG_EXTERN void png_push_process_row PNGARG((png_structp png_ptr));
-PNG_EXTERN void png_push_handle_unknown PNGARG((png_structp png_ptr,
-   png_infop info_ptr, png_uint_32 length));
-PNG_EXTERN void png_push_have_info PNGARG((png_structp png_ptr,
-   png_infop info_ptr));
-PNG_EXTERN void png_push_have_end PNGARG((png_structp png_ptr,
-   png_infop info_ptr));
-PNG_EXTERN void png_push_have_row PNGARG((png_structp png_ptr, png_bytep row));
-PNG_EXTERN void png_push_read_end PNGARG((png_structp png_ptr,
-   png_infop info_ptr));
-PNG_EXTERN void png_process_some_data PNGARG((png_structp png_ptr,
-   png_infop info_ptr));
-PNG_EXTERN void png_read_push_finish_row PNGARG((png_structp png_ptr));
-#if defined(PNG_READ_tEXt_SUPPORTED)
-PNG_EXTERN void png_push_handle_tEXt PNGARG((png_structp png_ptr,
-   png_infop info_ptr, png_uint_32 length));
-PNG_EXTERN void png_push_read_tEXt PNGARG((png_structp png_ptr,
-   png_infop info_ptr));
-#endif
-#if defined(PNG_READ_zTXt_SUPPORTED)
-PNG_EXTERN void png_push_handle_zTXt PNGARG((png_structp png_ptr,
-   png_infop info_ptr, png_uint_32 length));
-PNG_EXTERN void png_push_read_zTXt PNGARG((png_structp png_ptr,
-   png_infop info_ptr));
-#endif
-#if defined(PNG_READ_iTXt_SUPPORTED)
-PNG_EXTERN void png_push_handle_iTXt PNGARG((png_structp png_ptr,
-   png_infop info_ptr, png_uint_32 length));
-PNG_EXTERN void png_push_read_iTXt PNGARG((png_structp png_ptr,
-   png_infop info_ptr));
-#endif
-
-#endif /* PNG_PROGRESSIVE_READ_SUPPORTED */
-
-#ifdef PNG_MNG_FEATURES_SUPPORTED
-PNG_EXTERN void png_do_read_intrapixel PNGARG((png_row_infop row_info,
-   png_bytep row));
-PNG_EXTERN void png_do_write_intrapixel PNGARG((png_row_infop row_info,
-   png_bytep row));
-#endif
-
-#if defined(PNG_ASSEMBLER_CODE_SUPPORTED)
-#if defined(PNG_MMX_CODE_SUPPORTED)
-/* png.c */ /* PRIVATE */
-PNG_EXTERN void png_init_mmx_flags PNGARG((png_structp png_ptr));
-#endif
-#endif
-
-#if defined(PNG_INCH_CONVERSIONS) && defined(PNG_FLOATING_POINT_SUPPORTED)
-PNG_EXTERN png_uint_32 png_get_pixels_per_inch PNGARG((png_structp png_ptr,
-png_infop info_ptr));
-
-PNG_EXTERN png_uint_32 png_get_x_pixels_per_inch PNGARG((png_structp png_ptr,
-png_infop info_ptr));
-
-PNG_EXTERN png_uint_32 png_get_y_pixels_per_inch PNGARG((png_structp png_ptr,
-png_infop info_ptr));
-
-PNG_EXTERN float png_get_x_offset_inches PNGARG((png_structp png_ptr,
-png_infop info_ptr));
-
-PNG_EXTERN float png_get_y_offset_inches PNGARG((png_structp png_ptr,
-png_infop info_ptr));
-
-#if defined(PNG_pHYs_SUPPORTED)
-PNG_EXTERN png_uint_32 png_get_pHYs_dpi PNGARG((png_structp png_ptr,
-png_infop info_ptr, png_uint_32 *res_x, png_uint_32 *res_y, int *unit_type));
-#endif /* PNG_pHYs_SUPPORTED */
-#endif  /* PNG_INCH_CONVERSIONS && PNG_FLOATING_POINT_SUPPORTED */
-
-/* Maintainer: Put new private prototypes here ^ and in libpngpf.3 */
-
-#endif /* PNG_INTERNAL */
-
-#ifdef __cplusplus
-}
-#endif
-
-#endif /* PNG_VERSION_INFO_ONLY */
-/* do not put anything past this line */
-#endif /* PNG_H */
diff --git a/source/libpng/pngconf.h b/source/libpng/pngconf.h
deleted file mode 100644
index 06a182f..0000000
--- a/source/libpng/pngconf.h
+++ /dev/null
@@ -1,1481 +0,0 @@
-
-/* pngconf.h - machine configurable file for libpng
- *
- * libpng version 1.2.29 - May 8, 2008
- * For conditions of distribution and use, see copyright notice in png.h
- * Copyright (c) 1998-2008 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.)
- */
-
-/* Any machine specific code is near the front of this file, so if you
- * are configuring libpng for a machine, you may want to read the section
- * starting here down to where it starts to typedef png_color, png_text,
- * and png_info.
- */
-
-#ifndef PNGCONF_H
-#define PNGCONF_H
-
-#define PNG_1_2_X
-
-/* 
- * PNG_USER_CONFIG has to be defined on the compiler command line. This
- * includes the resource compiler for Windows DLL configurations.
- */
-#ifdef PNG_USER_CONFIG
-#  ifndef PNG_USER_PRIVATEBUILD
-#    define PNG_USER_PRIVATEBUILD
-#  endif
-#include "pngusr.h"
-#endif
-
-/* PNG_CONFIGURE_LIBPNG is set by the "configure" script. */
-#ifdef PNG_CONFIGURE_LIBPNG
-#ifdef HAVE_CONFIG_H
-#include "config.h"
-#endif
-#endif
-
-/*
- * Added at libpng-1.2.8
- *  
- * If you create a private DLL you need to define in "pngusr.h" the followings:
- * #define PNG_USER_PRIVATEBUILD <Describes by whom and why this version of
- *        the DLL was built>
- *  e.g. #define PNG_USER_PRIVATEBUILD "Build by MyCompany for xyz reasons."
- * #define PNG_USER_DLLFNAME_POSTFIX <two-letter postfix that serve to
- *        distinguish your DLL from those of the official release. These
- *        correspond to the trailing letters that come after the version
- *        number and must match your private DLL name>
- *  e.g. // private DLL "libpng13gx.dll"
- *       #define PNG_USER_DLLFNAME_POSTFIX "gx"
- * 
- * The following macros are also at your disposal if you want to complete the 
- * DLL VERSIONINFO structure.
- * - PNG_USER_VERSIONINFO_COMMENTS
- * - PNG_USER_VERSIONINFO_COMPANYNAME
- * - PNG_USER_VERSIONINFO_LEGALTRADEMARKS
- */
-
-#ifdef __STDC__
-#ifdef SPECIALBUILD
-#  pragma message("PNG_LIBPNG_SPECIALBUILD (and deprecated SPECIALBUILD)\
- are now LIBPNG reserved macros. Use PNG_USER_PRIVATEBUILD instead.")
-#endif
-
-#ifdef PRIVATEBUILD
-# pragma message("PRIVATEBUILD is deprecated.\
- Use PNG_USER_PRIVATEBUILD instead.")
-# define PNG_USER_PRIVATEBUILD PRIVATEBUILD
-#endif
-#endif /* __STDC__ */
-
-#ifndef PNG_VERSION_INFO_ONLY
-
-/* End of material added to libpng-1.2.8 */
-
-/* Added at libpng-1.2.19, removed at libpng-1.2.20 because it caused trouble
-   Restored at libpng-1.2.21 */
-#if !defined(PNG_NO_WARN_UNINITIALIZED_ROW) && \
-    !defined(PNG_WARN_UNINITIALIZED_ROW)
-#  define PNG_WARN_UNINITIALIZED_ROW 1
-#endif
-/* End of material added at libpng-1.2.19/1.2.21 */
-
-/* This is the size of the compression buffer, and thus the size of
- * an IDAT chunk.  Make this whatever size you feel is best for your
- * machine.  One of these will be allocated per png_struct.  When this
- * is full, it writes the data to the disk, and does some other
- * calculations.  Making this an extremely small size will slow
- * the library down, but you may want to experiment to determine
- * where it becomes significant, if you are concerned with memory
- * usage.  Note that zlib allocates at least 32Kb also.  For readers,
- * this describes the size of the buffer available to read the data in.
- * Unless this gets smaller than the size of a row (compressed),
- * it should not make much difference how big this is.
- */
-
-#ifndef PNG_ZBUF_SIZE
-#  define PNG_ZBUF_SIZE 8192
-#endif
-
-/* Enable if you want a write-only libpng */
-
-#ifndef PNG_NO_READ_SUPPORTED
-#  define PNG_READ_SUPPORTED
-#endif
-
-/* Enable if you want a read-only libpng */
-
-#ifndef PNG_NO_WRITE_SUPPORTED
-#  define PNG_WRITE_SUPPORTED
-#endif
-
-/* Enabled by default in 1.2.0.  You can disable this if you don't need to
-   support PNGs that are embedded in MNG datastreams */
-#if !defined(PNG_1_0_X) && !defined(PNG_NO_MNG_FEATURES)
-#  ifndef PNG_MNG_FEATURES_SUPPORTED
-#    define PNG_MNG_FEATURES_SUPPORTED
-#  endif
-#endif
-
-#ifndef PNG_NO_FLOATING_POINT_SUPPORTED
-#  ifndef PNG_FLOATING_POINT_SUPPORTED
-#    define PNG_FLOATING_POINT_SUPPORTED
-#  endif
-#endif
-
-/* If you are running on a machine where you cannot allocate more
- * than 64K of memory at once, uncomment this.  While libpng will not
- * normally need that much memory in a chunk (unless you load up a very
- * large file), zlib needs to know how big of a chunk it can use, and
- * libpng thus makes sure to check any memory allocation to verify it
- * will fit into memory.
-#define PNG_MAX_MALLOC_64K
- */
-#if defined(MAXSEG_64K) && !defined(PNG_MAX_MALLOC_64K)
-#  define PNG_MAX_MALLOC_64K
-#endif
-
-/* Special munging to support doing things the 'cygwin' way:
- * 'Normal' png-on-win32 defines/defaults:
- *   PNG_BUILD_DLL -- building dll
- *   PNG_USE_DLL   -- building an application, linking to dll
- *   (no define)   -- building static library, or building an
- *                    application and linking to the static lib
- * 'Cygwin' defines/defaults:
- *   PNG_BUILD_DLL -- (ignored) building the dll
- *   (no define)   -- (ignored) building an application, linking to the dll
- *   PNG_STATIC    -- (ignored) building the static lib, or building an 
- *                    application that links to the static lib.
- *   ALL_STATIC    -- (ignored) building various static libs, or building an 
- *                    application that links to the static libs.
- * Thus,
- * a cygwin user should define either PNG_BUILD_DLL or PNG_STATIC, and
- * this bit of #ifdefs will define the 'correct' config variables based on
- * that. If a cygwin user *wants* to define 'PNG_USE_DLL' that's okay, but
- * unnecessary.
- *
- * Also, the precedence order is:
- *   ALL_STATIC (since we can't #undef something outside our namespace)
- *   PNG_BUILD_DLL
- *   PNG_STATIC
- *   (nothing) == PNG_USE_DLL
- * 
- * CYGWIN (2002-01-20): The preceding is now obsolete. With the advent
- *   of auto-import in binutils, we no longer need to worry about 
- *   __declspec(dllexport) / __declspec(dllimport) and friends.  Therefore,
- *   we don't need to worry about PNG_STATIC or ALL_STATIC when it comes
- *   to __declspec() stuff.  However, we DO need to worry about 
- *   PNG_BUILD_DLL and PNG_STATIC because those change some defaults
- *   such as CONSOLE_IO and whether GLOBAL_ARRAYS are allowed.
- */
-#if defined(__CYGWIN__)
-#  if defined(ALL_STATIC)
-#    if defined(PNG_BUILD_DLL)
-#      undef PNG_BUILD_DLL
-#    endif
-#    if defined(PNG_USE_DLL)
-#      undef PNG_USE_DLL
-#    endif
-#    if defined(PNG_DLL)
-#      undef PNG_DLL
-#    endif
-#    if !defined(PNG_STATIC)
-#      define PNG_STATIC
-#    endif
-#  else
-#    if defined (PNG_BUILD_DLL)
-#      if defined(PNG_STATIC)
-#        undef PNG_STATIC
-#      endif
-#      if defined(PNG_USE_DLL)
-#        undef PNG_USE_DLL
-#      endif
-#      if !defined(PNG_DLL)
-#        define PNG_DLL
-#      endif
-#    else
-#      if defined(PNG_STATIC)
-#        if defined(PNG_USE_DLL)
-#          undef PNG_USE_DLL
-#        endif
-#        if defined(PNG_DLL)
-#          undef PNG_DLL
-#        endif
-#      else
-#        if !defined(PNG_USE_DLL)
-#          define PNG_USE_DLL
-#        endif
-#        if !defined(PNG_DLL)
-#          define PNG_DLL
-#        endif
-#      endif  
-#    endif  
-#  endif
-#endif
-
-/* This protects us against compilers that run on a windowing system
- * and thus don't have or would rather us not use the stdio types:
- * stdin, stdout, and stderr.  The only one currently used is stderr
- * in png_error() and png_warning().  #defining PNG_NO_CONSOLE_IO will
- * prevent these from being compiled and used. #defining PNG_NO_STDIO
- * will also prevent these, plus will prevent the entire set of stdio
- * macros and functions (FILE *, printf, etc.) from being compiled and used,
- * unless (PNG_DEBUG > 0) has been #defined.
- *
- * #define PNG_NO_CONSOLE_IO
- * #define PNG_NO_STDIO
- */
-
-#if defined(_WIN32_WCE)
-#  include <windows.h>
-   /* Console I/O functions are not supported on WindowsCE */
-#  define PNG_NO_CONSOLE_IO
-#  ifdef PNG_DEBUG
-#    undef PNG_DEBUG
-#  endif
-#endif
-
-#ifdef PNG_BUILD_DLL
-#  ifndef PNG_CONSOLE_IO_SUPPORTED
-#    ifndef PNG_NO_CONSOLE_IO
-#      define PNG_NO_CONSOLE_IO
-#    endif
-#  endif
-#endif
-
-#  ifdef PNG_NO_STDIO
-#    ifndef PNG_NO_CONSOLE_IO
-#      define PNG_NO_CONSOLE_IO
-#    endif
-#    ifdef PNG_DEBUG
-#      if (PNG_DEBUG > 0)
-#        include <stdio.h>
-#      endif
-#    endif
-#  else
-#    if !defined(_WIN32_WCE)
-/* "stdio.h" functions are not supported on WindowsCE */
-#      include <stdio.h>
-#    endif
-#  endif
-
-/* This macro protects us against machines that don't have function
- * prototypes (ie K&R style headers).  If your compiler does not handle
- * function prototypes, define this macro and use the included ansi2knr.
- * I've always been able to use _NO_PROTO as the indicator, but you may
- * need to drag the empty declaration out in front of here, or change the
- * ifdef to suit your own needs.
- */
-#ifndef PNGARG
-
-#ifdef OF /* zlib prototype munger */
-#  define PNGARG(arglist) OF(arglist)
-#else
-
-#ifdef _NO_PROTO
-#  define PNGARG(arglist) ()
-#  ifndef PNG_TYPECAST_NULL
-#     define PNG_TYPECAST_NULL
-#  endif
-#else
-#  define PNGARG(arglist) arglist
-#endif /* _NO_PROTO */
-
-
-#endif /* OF */
-
-#endif /* PNGARG */
-
-/* Try to determine if we are compiling on a Mac.  Note that testing for
- * just __MWERKS__ is not good enough, because the Codewarrior is now used
- * on non-Mac platforms.
- */
-#ifndef MACOS
-#  if (defined(__MWERKS__) && defined(macintosh)) || defined(applec) || \
-      defined(THINK_C) || defined(__SC__) || defined(TARGET_OS_MAC)
-#    define MACOS
-#  endif
-#endif
-
-/* enough people need this for various reasons to include it here */
-#if !defined(MACOS) && !defined(RISCOS) && !defined(_WIN32_WCE)
-#  include <sys/types.h>
-#endif
-
-#if !defined(PNG_SETJMP_NOT_SUPPORTED) && !defined(PNG_NO_SETJMP_SUPPORTED)
-#  define PNG_SETJMP_SUPPORTED
-#endif
-
-#ifdef PNG_SETJMP_SUPPORTED
-/* This is an attempt to force a single setjmp behaviour on Linux.  If
- * the X config stuff didn't define _BSD_SOURCE we wouldn't need this.
- */
-
-#  ifdef __linux__
-#    ifdef _BSD_SOURCE
-#      define PNG_SAVE_BSD_SOURCE
-#      undef _BSD_SOURCE
-#    endif
-#    ifdef _SETJMP_H
-     /* If you encounter a compiler error here, see the explanation
-      * near the end of INSTALL.
-      */
-         __pngconf.h__ already includes setjmp.h;
-         __dont__ include it again.;
-#    endif
-#  endif /* __linux__ */
-
-   /* include setjmp.h for error handling */
-#  include <setjmp.h>
-
-#  ifdef __linux__
-#    ifdef PNG_SAVE_BSD_SOURCE
-#      ifndef _BSD_SOURCE
-#        define _BSD_SOURCE
-#      endif
-#      undef PNG_SAVE_BSD_SOURCE
-#    endif
-#  endif /* __linux__ */
-#endif /* PNG_SETJMP_SUPPORTED */
-
-#ifdef BSD
-#  include <strings.h>
-#else
-#  include <string.h>
-#endif
-
-/* Other defines for things like memory and the like can go here.  */
-#ifdef PNG_INTERNAL
-
-#include <stdlib.h>
-
-/* The functions exported by PNG_EXTERN are PNG_INTERNAL functions, which
- * aren't usually used outside the library (as far as I know), so it is
- * debatable if they should be exported at all.  In the future, when it is
- * possible to have run-time registry of chunk-handling functions, some of
- * these will be made available again.
-#define PNG_EXTERN extern
- */
-#define PNG_EXTERN
-
-/* Other defines specific to compilers can go here.  Try to keep
- * them inside an appropriate ifdef/endif pair for portability.
- */
-
-#if defined(PNG_FLOATING_POINT_SUPPORTED)
-#  if defined(MACOS)
-     /* We need to check that <math.h> hasn't already been included earlier
-      * as it seems it doesn't agree with <fp.h>, yet we should really use
-      * <fp.h> if possible.
-      */
-#    if !defined(__MATH_H__) && !defined(__MATH_H) && !defined(__cmath__)
-#      include <fp.h>
-#    endif
-#  else
-#    include <math.h>
-#  endif
-#  if defined(_AMIGA) && defined(__SASC) && defined(_M68881)
-     /* Amiga SAS/C: We must include builtin FPU functions when compiling using
-      * MATH=68881
-      */
-#    include <m68881.h>
-#  endif
-#endif
-
-/* Codewarrior on NT has linking problems without this. */
-#if (defined(__MWERKS__) && defined(WIN32)) || defined(__STDC__)
-#  define PNG_ALWAYS_EXTERN
-#endif
-
-/* This provides the non-ANSI (far) memory allocation routines. */
-#if defined(__TURBOC__) && defined(__MSDOS__)
-#  include <mem.h>
-#  include <alloc.h>
-#endif
-
-/* I have no idea why is this necessary... */
-#if defined(_MSC_VER) && (defined(WIN32) || defined(_Windows) || \
-    defined(_WINDOWS) || defined(_WIN32) || defined(__WIN32__))
-#  include <malloc.h>
-#endif
-
-/* This controls how fine the dithering gets.  As this allocates
- * a largish chunk of memory (32K), those who are not as concerned
- * with dithering quality can decrease some or all of these.
- */
-#ifndef PNG_DITHER_RED_BITS
-#  define PNG_DITHER_RED_BITS 5
-#endif
-#ifndef PNG_DITHER_GREEN_BITS
-#  define PNG_DITHER_GREEN_BITS 5
-#endif
-#ifndef PNG_DITHER_BLUE_BITS
-#  define PNG_DITHER_BLUE_BITS 5
-#endif
-
-/* This controls how fine the gamma correction becomes when you
- * are only interested in 8 bits anyway.  Increasing this value
- * results in more memory being used, and more pow() functions
- * being called to fill in the gamma tables.  Don't set this value
- * less then 8, and even that may not work (I haven't tested it).
- */
-
-#ifndef PNG_MAX_GAMMA_8
-#  define PNG_MAX_GAMMA_8 11
-#endif
-
-/* This controls how much a difference in gamma we can tolerate before
- * we actually start doing gamma conversion.
- */
-#ifndef PNG_GAMMA_THRESHOLD
-#  define PNG_GAMMA_THRESHOLD 0.05
-#endif
-
-#endif /* PNG_INTERNAL */
-
-/* The following uses const char * instead of char * for error
- * and warning message functions, so some compilers won't complain.
- * If you do not want to use const, define PNG_NO_CONST here.
- */
-
-#ifndef PNG_NO_CONST
-#  define PNG_CONST const
-#else
-#  define PNG_CONST
-#endif
-
-/* The following defines give you the ability to remove code from the
- * library that you will not be using.  I wish I could figure out how to
- * automate this, but I can't do that without making it seriously hard
- * on the users.  So if you are not using an ability, change the #define
- * to and #undef, and that part of the library will not be compiled.  If
- * your linker can't find a function, you may want to make sure the
- * ability is defined here.  Some of these depend upon some others being
- * defined.  I haven't figured out all the interactions here, so you may
- * have to experiment awhile to get everything to compile.  If you are
- * creating or using a shared library, you probably shouldn't touch this,
- * as it will affect the size of the structures, and this will cause bad
- * things to happen if the library and/or application ever change.
- */
-
-/* Any features you will not be using can be undef'ed here */
-
-/* GR-P, 0.96a: Set "*TRANSFORMS_SUPPORTED as default but allow user
- * to turn it off with "*TRANSFORMS_NOT_SUPPORTED" or *PNG_NO_*_TRANSFORMS
- * on the compile line, then pick and choose which ones to define without
- * having to edit this file. It is safe to use the *TRANSFORMS_NOT_SUPPORTED
- * if you only want to have a png-compliant reader/writer but don't need
- * any of the extra transformations.  This saves about 80 kbytes in a
- * typical installation of the library. (PNG_NO_* form added in version
- * 1.0.1c, for consistency)
- */
-
-/* The size of the png_text structure changed in libpng-1.0.6 when
- * iTXt support was added.  iTXt support was turned off by default through
- * libpng-1.2.x, to support old apps that malloc the png_text structure
- * instead of calling png_set_text() and letting libpng malloc it.  It
- * was turned on by default in libpng-1.3.0.
- */
-
-#if defined(PNG_1_0_X) || defined (PNG_1_2_X)
-#  ifndef PNG_NO_iTXt_SUPPORTED
-#    define PNG_NO_iTXt_SUPPORTED
-#  endif
-#  ifndef PNG_NO_READ_iTXt
-#    define PNG_NO_READ_iTXt
-#  endif
-#  ifndef PNG_NO_WRITE_iTXt
-#    define PNG_NO_WRITE_iTXt
-#  endif
-#endif
-
-#if !defined(PNG_NO_iTXt_SUPPORTED)
-#  if !defined(PNG_READ_iTXt_SUPPORTED) && !defined(PNG_NO_READ_iTXt)
-#    define PNG_READ_iTXt
-#  endif
-#  if !defined(PNG_WRITE_iTXt_SUPPORTED) && !defined(PNG_NO_WRITE_iTXt)
-#    define PNG_WRITE_iTXt
-#  endif
-#endif
-
-/* The following support, added after version 1.0.0, can be turned off here en
- * masse by defining PNG_LEGACY_SUPPORTED in case you need binary compatibility
- * with old applications that require the length of png_struct and png_info
- * to remain unchanged.
- */
-
-#ifdef PNG_LEGACY_SUPPORTED
-#  define PNG_NO_FREE_ME
-#  define PNG_NO_READ_UNKNOWN_CHUNKS
-#  define PNG_NO_WRITE_UNKNOWN_CHUNKS
-#  define PNG_NO_READ_USER_CHUNKS
-#  define PNG_NO_READ_iCCP
-#  define PNG_NO_WRITE_iCCP
-#  define PNG_NO_READ_iTXt
-#  define PNG_NO_WRITE_iTXt
-#  define PNG_NO_READ_sCAL
-#  define PNG_NO_WRITE_sCAL
-#  define PNG_NO_READ_sPLT
-#  define PNG_NO_WRITE_sPLT
-#  define PNG_NO_INFO_IMAGE
-#  define PNG_NO_READ_RGB_TO_GRAY
-#  define PNG_NO_READ_USER_TRANSFORM
-#  define PNG_NO_WRITE_USER_TRANSFORM
-#  define PNG_NO_USER_MEM
-#  define PNG_NO_READ_EMPTY_PLTE
-#  define PNG_NO_MNG_FEATURES
-#  define PNG_NO_FIXED_POINT_SUPPORTED
-#endif
-
-/* Ignore attempt to turn off both floating and fixed point support */
-#if !defined(PNG_FLOATING_POINT_SUPPORTED) || \
-    !defined(PNG_NO_FIXED_POINT_SUPPORTED)
-#  define PNG_FIXED_POINT_SUPPORTED
-#endif
-
-#ifndef PNG_NO_FREE_ME
-#  define PNG_FREE_ME_SUPPORTED
-#endif
-
-#if defined(PNG_READ_SUPPORTED)
-
-#if !defined(PNG_READ_TRANSFORMS_NOT_SUPPORTED) && \
-      !defined(PNG_NO_READ_TRANSFORMS)
-#  define PNG_READ_TRANSFORMS_SUPPORTED
-#endif
-
-#ifdef PNG_READ_TRANSFORMS_SUPPORTED
-#  ifndef PNG_NO_READ_EXPAND
-#    define PNG_READ_EXPAND_SUPPORTED
-#  endif
-#  ifndef PNG_NO_READ_SHIFT
-#    define PNG_READ_SHIFT_SUPPORTED
-#  endif
-#  ifndef PNG_NO_READ_PACK
-#    define PNG_READ_PACK_SUPPORTED
-#  endif
-#  ifndef PNG_NO_READ_BGR
-#    define PNG_READ_BGR_SUPPORTED
-#  endif
-#  ifndef PNG_NO_READ_SWAP
-#    define PNG_READ_SWAP_SUPPORTED
-#  endif
-#  ifndef PNG_NO_READ_PACKSWAP
-#    define PNG_READ_PACKSWAP_SUPPORTED
-#  endif
-#  ifndef PNG_NO_READ_INVERT
-#    define PNG_READ_INVERT_SUPPORTED
-#  endif
-#  ifndef PNG_NO_READ_DITHER
-#    define PNG_READ_DITHER_SUPPORTED
-#  endif
-#  ifndef PNG_NO_READ_BACKGROUND
-#    define PNG_READ_BACKGROUND_SUPPORTED
-#  endif
-#  ifndef PNG_NO_READ_16_TO_8
-#    define PNG_READ_16_TO_8_SUPPORTED
-#  endif
-#  ifndef PNG_NO_READ_FILLER
-#    define PNG_READ_FILLER_SUPPORTED
-#  endif
-#  ifndef PNG_NO_READ_GAMMA
-#    define PNG_READ_GAMMA_SUPPORTED
-#  endif
-#  ifndef PNG_NO_READ_GRAY_TO_RGB
-#    define PNG_READ_GRAY_TO_RGB_SUPPORTED
-#  endif
-#  ifndef PNG_NO_READ_SWAP_ALPHA
-#    define PNG_READ_SWAP_ALPHA_SUPPORTED
-#  endif
-#  ifndef PNG_NO_READ_INVERT_ALPHA
-#    define PNG_READ_INVERT_ALPHA_SUPPORTED
-#  endif
-#  ifndef PNG_NO_READ_STRIP_ALPHA
-#    define PNG_READ_STRIP_ALPHA_SUPPORTED
-#  endif
-#  ifndef PNG_NO_READ_USER_TRANSFORM
-#    define PNG_READ_USER_TRANSFORM_SUPPORTED
-#  endif
-#  ifndef PNG_NO_READ_RGB_TO_GRAY
-#    define PNG_READ_RGB_TO_GRAY_SUPPORTED
-#  endif
-#endif /* PNG_READ_TRANSFORMS_SUPPORTED */
-
-#if !defined(PNG_NO_PROGRESSIVE_READ) && \
- !defined(PNG_PROGRESSIVE_READ_SUPPORTED) /* if you don't do progressive   */
-#  define PNG_PROGRESSIVE_READ_SUPPORTED  /* reading.  This is not talking */
-#endif                            /* about interlacing capability!  You'll */
-           /* still have interlacing unless you change the following line: */
-
-#define PNG_READ_INTERLACING_SUPPORTED /* required in PNG-compliant decoders */
-
-#ifndef PNG_NO_READ_COMPOSITE_NODIV
-#  ifndef PNG_NO_READ_COMPOSITED_NODIV  /* libpng-1.0.x misspelling */
-#    define PNG_READ_COMPOSITE_NODIV_SUPPORTED  /* well tested on Intel, SGI */
-#  endif
-#endif
-
-#if defined(PNG_1_0_X) || defined (PNG_1_2_X)
-/* Deprecated, will be removed from version 2.0.0.
-   Use PNG_MNG_FEATURES_SUPPORTED instead. */
-#ifndef PNG_NO_READ_EMPTY_PLTE
-#  define PNG_READ_EMPTY_PLTE_SUPPORTED
-#endif
-#endif
-
-#endif /* PNG_READ_SUPPORTED */
-
-#if defined(PNG_WRITE_SUPPORTED)
-
-# if !defined(PNG_WRITE_TRANSFORMS_NOT_SUPPORTED) && \
-    !defined(PNG_NO_WRITE_TRANSFORMS)
-#  define PNG_WRITE_TRANSFORMS_SUPPORTED
-#endif
-
-#ifdef PNG_WRITE_TRANSFORMS_SUPPORTED
-#  ifndef PNG_NO_WRITE_SHIFT
-#    define PNG_WRITE_SHIFT_SUPPORTED
-#  endif
-#  ifndef PNG_NO_WRITE_PACK
-#    define PNG_WRITE_PACK_SUPPORTED
-#  endif
-#  ifndef PNG_NO_WRITE_BGR
-#    define PNG_WRITE_BGR_SUPPORTED
-#  endif
-#  ifndef PNG_NO_WRITE_SWAP
-#    define PNG_WRITE_SWAP_SUPPORTED
-#  endif
-#  ifndef PNG_NO_WRITE_PACKSWAP
-#    define PNG_WRITE_PACKSWAP_SUPPORTED
-#  endif
-#  ifndef PNG_NO_WRITE_INVERT
-#    define PNG_WRITE_INVERT_SUPPORTED
-#  endif
-#  ifndef PNG_NO_WRITE_FILLER
-#    define PNG_WRITE_FILLER_SUPPORTED   /* same as WRITE_STRIP_ALPHA */
-#  endif
-#  ifndef PNG_NO_WRITE_SWAP_ALPHA
-#    define PNG_WRITE_SWAP_ALPHA_SUPPORTED
-#  endif
-#  ifndef PNG_NO_WRITE_INVERT_ALPHA
-#    define PNG_WRITE_INVERT_ALPHA_SUPPORTED
-#  endif
-#  ifndef PNG_NO_WRITE_USER_TRANSFORM
-#    define PNG_WRITE_USER_TRANSFORM_SUPPORTED
-#  endif
-#endif /* PNG_WRITE_TRANSFORMS_SUPPORTED */
-
-#if !defined(PNG_NO_WRITE_INTERLACING_SUPPORTED) && \
-    !defined(PNG_WRITE_INTERLACING_SUPPORTED)
-#define PNG_WRITE_INTERLACING_SUPPORTED  /* not required for PNG-compliant
-                                            encoders, but can cause trouble
-                                            if left undefined */
-#endif
-
-#if !defined(PNG_NO_WRITE_WEIGHTED_FILTER) && \
-    !defined(PNG_WRITE_WEIGHTED_FILTER) && \
-     defined(PNG_FLOATING_POINT_SUPPORTED)
-#  define PNG_WRITE_WEIGHTED_FILTER_SUPPORTED
-#endif
-
-#ifndef PNG_NO_WRITE_FLUSH
-#  define PNG_WRITE_FLUSH_SUPPORTED
-#endif
-
-#if defined(PNG_1_0_X) || defined (PNG_1_2_X)
-/* Deprecated, see PNG_MNG_FEATURES_SUPPORTED, above */
-#ifndef PNG_NO_WRITE_EMPTY_PLTE
-#  define PNG_WRITE_EMPTY_PLTE_SUPPORTED
-#endif
-#endif
-
-#endif /* PNG_WRITE_SUPPORTED */
-
-#ifndef PNG_1_0_X
-#  ifndef PNG_NO_ERROR_NUMBERS
-#    define PNG_ERROR_NUMBERS_SUPPORTED
-#  endif
-#endif /* PNG_1_0_X */
-
-#if defined(PNG_READ_USER_TRANSFORM_SUPPORTED) || \
-    defined(PNG_WRITE_USER_TRANSFORM_SUPPORTED)
-#  ifndef PNG_NO_USER_TRANSFORM_PTR
-#    define PNG_USER_TRANSFORM_PTR_SUPPORTED
-#  endif
-#endif
-
-#ifndef PNG_NO_STDIO
-#  define PNG_TIME_RFC1123_SUPPORTED
-#endif
-
-/* This adds extra functions in pngget.c for accessing data from the
- * info pointer (added in version 0.99)
- * png_get_image_width()
- * png_get_image_height()
- * png_get_bit_depth()
- * png_get_color_type()
- * png_get_compression_type()
- * png_get_filter_type()
- * png_get_interlace_type()
- * png_get_pixel_aspect_ratio()
- * png_get_pixels_per_meter()
- * png_get_x_offset_pixels()
- * png_get_y_offset_pixels()
- * png_get_x_offset_microns()
- * png_get_y_offset_microns()
- */
-#if !defined(PNG_NO_EASY_ACCESS) && !defined(PNG_EASY_ACCESS_SUPPORTED)
-#  define PNG_EASY_ACCESS_SUPPORTED
-#endif
-
-/* PNG_ASSEMBLER_CODE was enabled by default in version 1.2.0 
- * and removed from version 1.2.20.  The following will be removed
- * from libpng-1.4.0
-*/
-
-#if defined(PNG_READ_SUPPORTED) && !defined(PNG_NO_OPTIMIZED_CODE)
-#  ifndef PNG_OPTIMIZED_CODE_SUPPORTED
-#    define PNG_OPTIMIZED_CODE_SUPPORTED
-#  endif
-#endif
-
-#if defined(PNG_READ_SUPPORTED) && !defined(PNG_NO_ASSEMBLER_CODE)
-#  ifndef PNG_ASSEMBLER_CODE_SUPPORTED
-#    define PNG_ASSEMBLER_CODE_SUPPORTED
-#  endif
-
-#  if defined(__GNUC__) && defined(__x86_64__) && (__GNUC__ < 4)
-     /* work around 64-bit gcc compiler bugs in gcc-3.x */
-#    if !defined(PNG_MMX_CODE_SUPPORTED) && !defined(PNG_NO_MMX_CODE)
-#      define PNG_NO_MMX_CODE
-#    endif
-#  endif
-
-#  if defined(__APPLE__)
-#    if !defined(PNG_MMX_CODE_SUPPORTED) && !defined(PNG_NO_MMX_CODE)
-#      define PNG_NO_MMX_CODE
-#    endif
-#  endif
-
-#  if (defined(__MWERKS__) && ((__MWERKS__ < 0x0900) || macintosh))
-#    if !defined(PNG_MMX_CODE_SUPPORTED) && !defined(PNG_NO_MMX_CODE)
-#      define PNG_NO_MMX_CODE
-#    endif
-#  endif
-
-#  if !defined(PNG_MMX_CODE_SUPPORTED) && !defined(PNG_NO_MMX_CODE)
-#    define PNG_MMX_CODE_SUPPORTED
-#  endif
-
-#endif
-/* end of obsolete code to be removed from libpng-1.4.0 */
-
-#if !defined(PNG_1_0_X)
-#if !defined(PNG_NO_USER_MEM) && !defined(PNG_USER_MEM_SUPPORTED)
-#  define PNG_USER_MEM_SUPPORTED
-#endif
-#endif /* PNG_1_0_X */
-
-/* Added at libpng-1.2.6 */
-#if !defined(PNG_1_0_X)
-#ifndef PNG_SET_USER_LIMITS_SUPPORTED
-#if !defined(PNG_NO_SET_USER_LIMITS) && !defined(PNG_SET_USER_LIMITS_SUPPORTED)
-#  define PNG_SET_USER_LIMITS_SUPPORTED
-#endif
-#endif
-#endif /* PNG_1_0_X */
-
-/* Added at libpng-1.0.16 and 1.2.6.  To accept all valid PNGS no matter
- * how large, set these limits to 0x7fffffffL
- */
-#ifndef PNG_USER_WIDTH_MAX
-#  define PNG_USER_WIDTH_MAX 1000000L
-#endif
-#ifndef PNG_USER_HEIGHT_MAX
-#  define PNG_USER_HEIGHT_MAX 1000000L
-#endif
-
-/* These are currently experimental features, define them if you want */
-
-/* very little testing */
-/*
-#ifdef PNG_READ_SUPPORTED
-#  ifndef PNG_READ_16_TO_8_ACCURATE_SCALE_SUPPORTED
-#    define PNG_READ_16_TO_8_ACCURATE_SCALE_SUPPORTED
-#  endif
-#endif
-*/
-
-/* This is only for PowerPC big-endian and 680x0 systems */
-/* some testing */
-/*
-#ifndef PNG_READ_BIG_ENDIAN_SUPPORTED
-#  define PNG_READ_BIG_ENDIAN_SUPPORTED
-#endif
-*/
-
-/* Buggy compilers (e.g., gcc 2.7.2.2) need this */
-/*
-#define PNG_NO_POINTER_INDEXING
-*/
-
-/* These functions are turned off by default, as they will be phased out. */
-/*
-#define  PNG_USELESS_TESTS_SUPPORTED
-#define  PNG_CORRECT_PALETTE_SUPPORTED
-*/
-
-/* Any chunks you are not interested in, you can undef here.  The
- * ones that allocate memory may be expecially important (hIST,
- * tEXt, zTXt, tRNS, pCAL).  Others will just save time and make png_info
- * a bit smaller.
- */
-
-#if defined(PNG_READ_SUPPORTED) && \
-    !defined(PNG_READ_ANCILLARY_CHUNKS_NOT_SUPPORTED) && \
-    !defined(PNG_NO_READ_ANCILLARY_CHUNKS)
-#  define PNG_READ_ANCILLARY_CHUNKS_SUPPORTED
-#endif
-
-#if defined(PNG_WRITE_SUPPORTED) && \
-    !defined(PNG_WRITE_ANCILLARY_CHUNKS_NOT_SUPPORTED) && \
-    !defined(PNG_NO_WRITE_ANCILLARY_CHUNKS)
-#  define PNG_WRITE_ANCILLARY_CHUNKS_SUPPORTED
-#endif
-
-#ifdef PNG_READ_ANCILLARY_CHUNKS_SUPPORTED
-
-#ifdef PNG_NO_READ_TEXT
-#  define PNG_NO_READ_iTXt
-#  define PNG_NO_READ_tEXt
-#  define PNG_NO_READ_zTXt
-#endif
-#ifndef PNG_NO_READ_bKGD
-#  define PNG_READ_bKGD_SUPPORTED
-#  define PNG_bKGD_SUPPORTED
-#endif
-#ifndef PNG_NO_READ_cHRM
-#  define PNG_READ_cHRM_SUPPORTED
-#  define PNG_cHRM_SUPPORTED
-#endif
-#ifndef PNG_NO_READ_gAMA
-#  define PNG_READ_gAMA_SUPPORTED
-#  define PNG_gAMA_SUPPORTED
-#endif
-#ifndef PNG_NO_READ_hIST
-#  define PNG_READ_hIST_SUPPORTED
-#  define PNG_hIST_SUPPORTED
-#endif
-#ifndef PNG_NO_READ_iCCP
-#  define PNG_READ_iCCP_SUPPORTED
-#  define PNG_iCCP_SUPPORTED
-#endif
-#ifndef PNG_NO_READ_iTXt
-#  ifndef PNG_READ_iTXt_SUPPORTED
-#    define PNG_READ_iTXt_SUPPORTED
-#  endif
-#  ifndef PNG_iTXt_SUPPORTED
-#    define PNG_iTXt_SUPPORTED
-#  endif
-#endif
-#ifndef PNG_NO_READ_oFFs
-#  define PNG_READ_oFFs_SUPPORTED
-#  define PNG_oFFs_SUPPORTED
-#endif
-#ifndef PNG_NO_READ_pCAL
-#  define PNG_READ_pCAL_SUPPORTED
-#  define PNG_pCAL_SUPPORTED
-#endif
-#ifndef PNG_NO_READ_sCAL
-#  define PNG_READ_sCAL_SUPPORTED
-#  define PNG_sCAL_SUPPORTED
-#endif
-#ifndef PNG_NO_READ_pHYs
-#  define PNG_READ_pHYs_SUPPORTED
-#  define PNG_pHYs_SUPPORTED
-#endif
-#ifndef PNG_NO_READ_sBIT
-#  define PNG_READ_sBIT_SUPPORTED
-#  define PNG_sBIT_SUPPORTED
-#endif
-#ifndef PNG_NO_READ_sPLT
-#  define PNG_READ_sPLT_SUPPORTED
-#  define PNG_sPLT_SUPPORTED
-#endif
-#ifndef PNG_NO_READ_sRGB
-#  define PNG_READ_sRGB_SUPPORTED
-#  define PNG_sRGB_SUPPORTED
-#endif
-#ifndef PNG_NO_READ_tEXt
-#  define PNG_READ_tEXt_SUPPORTED
-#  define PNG_tEXt_SUPPORTED
-#endif
-#ifndef PNG_NO_READ_tIME
-#  define PNG_READ_tIME_SUPPORTED
-#  define PNG_tIME_SUPPORTED
-#endif
-#ifndef PNG_NO_READ_tRNS
-#  define PNG_READ_tRNS_SUPPORTED
-#  define PNG_tRNS_SUPPORTED
-#endif
-#ifndef PNG_NO_READ_zTXt
-#  define PNG_READ_zTXt_SUPPORTED
-#  define PNG_zTXt_SUPPORTED
-#endif
-#ifndef PNG_NO_READ_UNKNOWN_CHUNKS
-#  define PNG_READ_UNKNOWN_CHUNKS_SUPPORTED
-#  ifndef PNG_UNKNOWN_CHUNKS_SUPPORTED
-#    define PNG_UNKNOWN_CHUNKS_SUPPORTED
-#  endif
-#  ifndef PNG_NO_HANDLE_AS_UNKNOWN
-#    define PNG_HANDLE_AS_UNKNOWN_SUPPORTED
-#  endif
-#endif
-#if !defined(PNG_NO_READ_USER_CHUNKS) && \
-     defined(PNG_READ_UNKNOWN_CHUNKS_SUPPORTED)
-#  define PNG_READ_USER_CHUNKS_SUPPORTED
-#  define PNG_USER_CHUNKS_SUPPORTED
-#  ifdef PNG_NO_READ_UNKNOWN_CHUNKS
-#    undef PNG_NO_READ_UNKNOWN_CHUNKS
-#  endif
-#  ifdef PNG_NO_HANDLE_AS_UNKNOWN
-#    undef PNG_NO_HANDLE_AS_UNKNOWN
-#  endif
-#endif
-#ifndef PNG_NO_READ_OPT_PLTE
-#  define PNG_READ_OPT_PLTE_SUPPORTED /* only affects support of the */
-#endif                      /* optional PLTE chunk in RGB and RGBA images */
-#if defined(PNG_READ_iTXt_SUPPORTED) || defined(PNG_READ_tEXt_SUPPORTED) || \
-    defined(PNG_READ_zTXt_SUPPORTED)
-#  define PNG_READ_TEXT_SUPPORTED
-#  define PNG_TEXT_SUPPORTED
-#endif
-
-#endif /* PNG_READ_ANCILLARY_CHUNKS_SUPPORTED */
-
-#ifdef PNG_WRITE_ANCILLARY_CHUNKS_SUPPORTED
-
-#ifdef PNG_NO_WRITE_TEXT
-#  define PNG_NO_WRITE_iTXt
-#  define PNG_NO_WRITE_tEXt
-#  define PNG_NO_WRITE_zTXt
-#endif
-#ifndef PNG_NO_WRITE_bKGD
-#  define PNG_WRITE_bKGD_SUPPORTED
-#  ifndef PNG_bKGD_SUPPORTED
-#    define PNG_bKGD_SUPPORTED
-#  endif
-#endif
-#ifndef PNG_NO_WRITE_cHRM
-#  define PNG_WRITE_cHRM_SUPPORTED
-#  ifndef PNG_cHRM_SUPPORTED
-#    define PNG_cHRM_SUPPORTED
-#  endif
-#endif
-#ifndef PNG_NO_WRITE_gAMA
-#  define PNG_WRITE_gAMA_SUPPORTED
-#  ifndef PNG_gAMA_SUPPORTED
-#    define PNG_gAMA_SUPPORTED
-#  endif
-#endif
-#ifndef PNG_NO_WRITE_hIST
-#  define PNG_WRITE_hIST_SUPPORTED
-#  ifndef PNG_hIST_SUPPORTED
-#    define PNG_hIST_SUPPORTED
-#  endif
-#endif
-#ifndef PNG_NO_WRITE_iCCP
-#  define PNG_WRITE_iCCP_SUPPORTED
-#  ifndef PNG_iCCP_SUPPORTED
-#    define PNG_iCCP_SUPPORTED
-#  endif
-#endif
-#ifndef PNG_NO_WRITE_iTXt
-#  ifndef PNG_WRITE_iTXt_SUPPORTED
-#    define PNG_WRITE_iTXt_SUPPORTED
-#  endif
-#  ifndef PNG_iTXt_SUPPORTED
-#    define PNG_iTXt_SUPPORTED
-#  endif
-#endif
-#ifndef PNG_NO_WRITE_oFFs
-#  define PNG_WRITE_oFFs_SUPPORTED
-#  ifndef PNG_oFFs_SUPPORTED
-#    define PNG_oFFs_SUPPORTED
-#  endif
-#endif
-#ifndef PNG_NO_WRITE_pCAL
-#  define PNG_WRITE_pCAL_SUPPORTED
-#  ifndef PNG_pCAL_SUPPORTED
-#    define PNG_pCAL_SUPPORTED
-#  endif
-#endif
-#ifndef PNG_NO_WRITE_sCAL
-#  define PNG_WRITE_sCAL_SUPPORTED
-#  ifndef PNG_sCAL_SUPPORTED
-#    define PNG_sCAL_SUPPORTED
-#  endif
-#endif
-#ifndef PNG_NO_WRITE_pHYs
-#  define PNG_WRITE_pHYs_SUPPORTED
-#  ifndef PNG_pHYs_SUPPORTED
-#    define PNG_pHYs_SUPPORTED
-#  endif
-#endif
-#ifndef PNG_NO_WRITE_sBIT
-#  define PNG_WRITE_sBIT_SUPPORTED
-#  ifndef PNG_sBIT_SUPPORTED
-#    define PNG_sBIT_SUPPORTED
-#  endif
-#endif
-#ifndef PNG_NO_WRITE_sPLT
-#  define PNG_WRITE_sPLT_SUPPORTED
-#  ifndef PNG_sPLT_SUPPORTED
-#    define PNG_sPLT_SUPPORTED
-#  endif
-#endif
-#ifndef PNG_NO_WRITE_sRGB
-#  define PNG_WRITE_sRGB_SUPPORTED
-#  ifndef PNG_sRGB_SUPPORTED
-#    define PNG_sRGB_SUPPORTED
-#  endif
-#endif
-#ifndef PNG_NO_WRITE_tEXt
-#  define PNG_WRITE_tEXt_SUPPORTED
-#  ifndef PNG_tEXt_SUPPORTED
-#    define PNG_tEXt_SUPPORTED
-#  endif
-#endif
-#ifndef PNG_NO_WRITE_tIME
-#  define PNG_WRITE_tIME_SUPPORTED
-#  ifndef PNG_tIME_SUPPORTED
-#    define PNG_tIME_SUPPORTED
-#  endif
-#endif
-#ifndef PNG_NO_WRITE_tRNS
-#  define PNG_WRITE_tRNS_SUPPORTED
-#  ifndef PNG_tRNS_SUPPORTED
-#    define PNG_tRNS_SUPPORTED
-#  endif
-#endif
-#ifndef PNG_NO_WRITE_zTXt
-#  define PNG_WRITE_zTXt_SUPPORTED
-#  ifndef PNG_zTXt_SUPPORTED
-#    define PNG_zTXt_SUPPORTED
-#  endif
-#endif
-#ifndef PNG_NO_WRITE_UNKNOWN_CHUNKS
-#  define PNG_WRITE_UNKNOWN_CHUNKS_SUPPORTED
-#  ifndef PNG_UNKNOWN_CHUNKS_SUPPORTED
-#    define PNG_UNKNOWN_CHUNKS_SUPPORTED
-#  endif
-#  ifndef PNG_NO_HANDLE_AS_UNKNOWN
-#     ifndef PNG_HANDLE_AS_UNKNOWN_SUPPORTED
-#       define PNG_HANDLE_AS_UNKNOWN_SUPPORTED
-#     endif
-#  endif
-#endif
-#if defined(PNG_WRITE_iTXt_SUPPORTED) || defined(PNG_WRITE_tEXt_SUPPORTED) || \
-    defined(PNG_WRITE_zTXt_SUPPORTED)
-#  define PNG_WRITE_TEXT_SUPPORTED
-#  ifndef PNG_TEXT_SUPPORTED
-#    define PNG_TEXT_SUPPORTED
-#  endif
-#endif
-
-#endif /* PNG_WRITE_ANCILLARY_CHUNKS_SUPPORTED */
-
-/* Turn this off to disable png_read_png() and
- * png_write_png() and leave the row_pointers member
- * out of the info structure.
- */
-#ifndef PNG_NO_INFO_IMAGE
-#  define PNG_INFO_IMAGE_SUPPORTED
-#endif
-
-/* need the time information for reading tIME chunks */
-#if defined(PNG_tIME_SUPPORTED)
-#  if !defined(_WIN32_WCE)
-     /* "time.h" functions are not supported on WindowsCE */
-#    include <time.h>
-#  endif
-#endif
-
-/* Some typedefs to get us started.  These should be safe on most of the
- * common platforms.  The typedefs should be at least as large as the
- * numbers suggest (a png_uint_32 must be at least 32 bits long), but they
- * don't have to be exactly that size.  Some compilers dislike passing
- * unsigned shorts as function parameters, so you may be better off using
- * unsigned int for png_uint_16.  Likewise, for 64-bit systems, you may
- * want to have unsigned int for png_uint_32 instead of unsigned long.
- */
-
-typedef unsigned long png_uint_32;
-typedef long png_int_32;
-typedef unsigned short png_uint_16;
-typedef short png_int_16;
-typedef unsigned char png_byte;
-
-/* This is usually size_t.  It is typedef'ed just in case you need it to
-   change (I'm not sure if you will or not, so I thought I'd be safe) */
-#ifdef PNG_SIZE_T
-   typedef PNG_SIZE_T png_size_t;
-#  define png_sizeof(x) png_convert_size(sizeof (x))
-#else
-   typedef size_t png_size_t;
-#  define png_sizeof(x) sizeof (x)
-#endif
-
-/* The following is needed for medium model support.  It cannot be in the
- * PNG_INTERNAL section.  Needs modification for other compilers besides
- * MSC.  Model independent support declares all arrays and pointers to be
- * large using the far keyword.  The zlib version used must also support
- * model independent data.  As of version zlib 1.0.4, the necessary changes
- * have been made in zlib.  The USE_FAR_KEYWORD define triggers other
- * changes that are needed. (Tim Wegner)
- */
-
-/* Separate compiler dependencies (problem here is that zlib.h always
-   defines FAR. (SJT) */
-#ifdef __BORLANDC__
-#  if defined(__LARGE__) || defined(__HUGE__) || defined(__COMPACT__)
-#    define LDATA 1
-#  else
-#    define LDATA 0
-#  endif
-   /* GRR:  why is Cygwin in here?  Cygwin is not Borland C... */
-#  if !defined(__WIN32__) && !defined(__FLAT__) && !defined(__CYGWIN__)
-#    define PNG_MAX_MALLOC_64K
-#    if (LDATA != 1)
-#      ifndef FAR
-#        define FAR __far
-#      endif
-#      define USE_FAR_KEYWORD
-#    endif   /* LDATA != 1 */
-     /* Possibly useful for moving data out of default segment.
-      * Uncomment it if you want. Could also define FARDATA as
-      * const if your compiler supports it. (SJT)
-#    define FARDATA FAR
-      */
-#  endif  /* __WIN32__, __FLAT__, __CYGWIN__ */
-#endif   /* __BORLANDC__ */
-
-
-/* Suggest testing for specific compiler first before testing for
- * FAR.  The Watcom compiler defines both __MEDIUM__ and M_I86MM,
- * making reliance oncertain keywords suspect. (SJT)
- */
-
-/* MSC Medium model */
-#if defined(FAR)
-#  if defined(M_I86MM)
-#    define USE_FAR_KEYWORD
-#    define FARDATA FAR
-#    include <dos.h>
-#  endif
-#endif
-
-/* SJT: default case */
-#ifndef FAR
-#  define FAR
-#endif
-
-/* At this point FAR is always defined */
-#ifndef FARDATA
-#  define FARDATA
-#endif
-
-/* Typedef for floating-point numbers that are converted
-   to fixed-point with a multiple of 100,000, e.g., int_gamma */
-typedef png_int_32 png_fixed_point;
-
-/* Add typedefs for pointers */
-typedef void            FAR * png_voidp;
-typedef png_byte        FAR * png_bytep;
-typedef png_uint_32     FAR * png_uint_32p;
-typedef png_int_32      FAR * png_int_32p;
-typedef png_uint_16     FAR * png_uint_16p;
-typedef png_int_16      FAR * png_int_16p;
-typedef PNG_CONST char  FAR * png_const_charp;
-typedef char            FAR * png_charp;
-typedef png_fixed_point FAR * png_fixed_point_p;
-
-#ifndef PNG_NO_STDIO
-#if defined(_WIN32_WCE)
-typedef HANDLE                png_FILE_p;
-#else
-typedef FILE                * png_FILE_p;
-#endif
-#endif
-
-#ifdef PNG_FLOATING_POINT_SUPPORTED
-typedef double          FAR * png_doublep;
-#endif
-
-/* Pointers to pointers; i.e. arrays */
-typedef png_byte        FAR * FAR * png_bytepp;
-typedef png_uint_32     FAR * FAR * png_uint_32pp;
-typedef png_int_32      FAR * FAR * png_int_32pp;
-typedef png_uint_16     FAR * FAR * png_uint_16pp;
-typedef png_int_16      FAR * FAR * png_int_16pp;
-typedef PNG_CONST char  FAR * FAR * png_const_charpp;
-typedef char            FAR * FAR * png_charpp;
-typedef png_fixed_point FAR * FAR * png_fixed_point_pp;
-#ifdef PNG_FLOATING_POINT_SUPPORTED
-typedef double          FAR * FAR * png_doublepp;
-#endif
-
-/* Pointers to pointers to pointers; i.e., pointer to array */
-typedef char            FAR * FAR * FAR * png_charppp;
-
-#if defined(PNG_1_0_X) || defined(PNG_1_2_X)
-/* SPC -  Is this stuff deprecated? */
-/* It'll be removed as of libpng-1.3.0 - GR-P */
-/* libpng typedefs for types in zlib. If zlib changes
- * or another compression library is used, then change these.
- * Eliminates need to change all the source files.
- */
-typedef charf *         png_zcharp;
-typedef charf * FAR *   png_zcharpp;
-typedef z_stream FAR *  png_zstreamp;
-#endif /* (PNG_1_0_X) || defined(PNG_1_2_X) */
-
-/*
- * Define PNG_BUILD_DLL if the module being built is a Windows
- * LIBPNG DLL.
- *
- * Define PNG_USE_DLL if you want to *link* to the Windows LIBPNG DLL.
- * It is equivalent to Microsoft predefined macro _DLL that is
- * automatically defined when you compile using the share
- * version of the CRT (C Run-Time library)
- *
- * The cygwin mods make this behavior a little different:
- * Define PNG_BUILD_DLL if you are building a dll for use with cygwin
- * Define PNG_STATIC if you are building a static library for use with cygwin,
- *   -or- if you are building an application that you want to link to the
- *   static library.
- * PNG_USE_DLL is defined by default (no user action needed) unless one of
- *   the other flags is defined.
- */
-
-#if !defined(PNG_DLL) && (defined(PNG_BUILD_DLL) || defined(PNG_USE_DLL))
-#  define PNG_DLL
-#endif
-/* If CYGWIN, then disallow GLOBAL ARRAYS unless building a static lib.
- * When building a static lib, default to no GLOBAL ARRAYS, but allow
- * command-line override
- */
-#if defined(__CYGWIN__)
-#  if !defined(PNG_STATIC)
-#    if defined(PNG_USE_GLOBAL_ARRAYS)
-#      undef PNG_USE_GLOBAL_ARRAYS
-#    endif
-#    if !defined(PNG_USE_LOCAL_ARRAYS)
-#      define PNG_USE_LOCAL_ARRAYS
-#    endif
-#  else
-#    if defined(PNG_USE_LOCAL_ARRAYS) || defined(PNG_NO_GLOBAL_ARRAYS)
-#      if defined(PNG_USE_GLOBAL_ARRAYS)
-#        undef PNG_USE_GLOBAL_ARRAYS
-#      endif
-#    endif
-#  endif
-#  if !defined(PNG_USE_LOCAL_ARRAYS) && !defined(PNG_USE_GLOBAL_ARRAYS)
-#    define PNG_USE_LOCAL_ARRAYS
-#  endif
-#endif
-
-/* Do not use global arrays (helps with building DLL's)
- * They are no longer used in libpng itself, since version 1.0.5c,
- * but might be required for some pre-1.0.5c applications.
- */
-#if !defined(PNG_USE_LOCAL_ARRAYS) && !defined(PNG_USE_GLOBAL_ARRAYS)
-#  if defined(PNG_NO_GLOBAL_ARRAYS) || \
-      (defined(__GNUC__) && defined(PNG_DLL)) || defined(_MSC_VER)
-#    define PNG_USE_LOCAL_ARRAYS
-#  else
-#    define PNG_USE_GLOBAL_ARRAYS
-#  endif
-#endif
-
-#if defined(__CYGWIN__)
-#  undef PNGAPI
-#  define PNGAPI __cdecl
-#  undef PNG_IMPEXP
-#  define PNG_IMPEXP
-#endif  
-
-/* If you define PNGAPI, e.g., with compiler option "-DPNGAPI=__stdcall",
- * you may get warnings regarding the linkage of png_zalloc and png_zfree.
- * Don't ignore those warnings; you must also reset the default calling
- * convention in your compiler to match your PNGAPI, and you must build
- * zlib and your applications the same way you build libpng.
- */
-
-#if defined(__MINGW32__) && !defined(PNG_MODULEDEF)
-#  ifndef PNG_NO_MODULEDEF
-#    define PNG_NO_MODULEDEF
-#  endif
-#endif
-
-#if !defined(PNG_IMPEXP) && defined(PNG_BUILD_DLL) && !defined(PNG_NO_MODULEDEF)
-#  define PNG_IMPEXP
-#endif
-
-#if defined(PNG_DLL) || defined(_DLL) || defined(__DLL__ ) || \
-    (( defined(_Windows) || defined(_WINDOWS) || \
-       defined(WIN32) || defined(_WIN32) || defined(__WIN32__) ))
-
-#  ifndef PNGAPI
-#     if defined(__GNUC__) || (defined (_MSC_VER) && (_MSC_VER >= 800))
-#        define PNGAPI __cdecl
-#     else
-#        define PNGAPI _cdecl
-#     endif
-#  endif
-
-#  if !defined(PNG_IMPEXP) && (!defined(PNG_DLL) || \
-       0 /* WINCOMPILER_WITH_NO_SUPPORT_FOR_DECLIMPEXP */)
-#     define PNG_IMPEXP
-#  endif
-
-#  if !defined(PNG_IMPEXP)
-
-#     define PNG_EXPORT_TYPE1(type,symbol)  PNG_IMPEXP type PNGAPI symbol
-#     define PNG_EXPORT_TYPE2(type,symbol)  type PNG_IMPEXP PNGAPI symbol
-
-      /* Borland/Microsoft */
-#     if defined(_MSC_VER) || defined(__BORLANDC__)
-#        if (_MSC_VER >= 800) || (__BORLANDC__ >= 0x500)
-#           define PNG_EXPORT PNG_EXPORT_TYPE1
-#        else
-#           define PNG_EXPORT PNG_EXPORT_TYPE2
-#           if defined(PNG_BUILD_DLL)
-#              define PNG_IMPEXP __export
-#           else
-#              define PNG_IMPEXP /*__import */ /* doesn't exist AFAIK in
-                                                 VC++ */
-#           endif                             /* Exists in Borland C++ for
-                                                 C++ classes (== huge) */
-#        endif
-#     endif
-
-#     if !defined(PNG_IMPEXP)
-#        if defined(PNG_BUILD_DLL)
-#           define PNG_IMPEXP __declspec(dllexport)
-#        else
-#           define PNG_IMPEXP __declspec(dllimport)
-#        endif
-#     endif
-#  endif  /* PNG_IMPEXP */
-#else /* !(DLL || non-cygwin WINDOWS) */
-#   if (defined(__IBMC__) || defined(__IBMCPP__)) && defined(__OS2__)
-#      ifndef PNGAPI
-#         define PNGAPI _System
-#      endif
-#   else
-#      if 0 /* ... other platforms, with other meanings */
-#      endif
-#   endif
-#endif
-
-#ifndef PNGAPI
-#  define PNGAPI
-#endif
-#ifndef PNG_IMPEXP
-#  define PNG_IMPEXP
-#endif
-
-#ifdef PNG_BUILDSYMS
-#  ifndef PNG_EXPORT
-#    define PNG_EXPORT(type,symbol) PNG_FUNCTION_EXPORT symbol END
-#  endif
-#  ifdef PNG_USE_GLOBAL_ARRAYS
-#    ifndef PNG_EXPORT_VAR
-#      define PNG_EXPORT_VAR(type) PNG_DATA_EXPORT
-#    endif
-#  endif
-#endif
-
-#ifndef PNG_EXPORT
-#  define PNG_EXPORT(type,symbol) PNG_IMPEXP type PNGAPI symbol
-#endif
-
-#ifdef PNG_USE_GLOBAL_ARRAYS
-#  ifndef PNG_EXPORT_VAR
-#    define PNG_EXPORT_VAR(type) extern PNG_IMPEXP type
-#  endif
-#endif
-
-/* User may want to use these so they are not in PNG_INTERNAL. Any library
- * functions that are passed far data must be model independent.
- */
-
-#ifndef PNG_ABORT
-#  define PNG_ABORT() abort()
-#endif
-
-#ifdef PNG_SETJMP_SUPPORTED
-#  define png_jmpbuf(png_ptr) ((png_ptr)->jmpbuf)
-#else
-#  define png_jmpbuf(png_ptr) \
-   (LIBPNG_WAS_COMPILED_WITH__PNG_SETJMP_NOT_SUPPORTED)
-#endif
-
-#if defined(USE_FAR_KEYWORD)  /* memory model independent fns */
-/* use this to make far-to-near assignments */
-#  define CHECK   1
-#  define NOCHECK 0
-#  define CVT_PTR(ptr) (png_far_to_near(png_ptr,ptr,CHECK))
-#  define CVT_PTR_NOCHECK(ptr) (png_far_to_near(png_ptr,ptr,NOCHECK))
-#  define png_snprintf _fsnprintf   /* Added to v 1.2.19 */
-#  define png_strlen  _fstrlen
-#  define png_memcmp  _fmemcmp    /* SJT: added */
-#  define png_memcpy  _fmemcpy
-#  define png_memset  _fmemset
-#else /* use the usual functions */
-#  define CVT_PTR(ptr)         (ptr)
-#  define CVT_PTR_NOCHECK(ptr) (ptr)
-#  ifndef PNG_NO_SNPRINTF
-#    ifdef _MSC_VER
-#      define png_snprintf _snprintf   /* Added to v 1.2.19 */
-#      define png_snprintf2 _snprintf
-#      define png_snprintf6 _snprintf
-#    else
-#      define png_snprintf snprintf   /* Added to v 1.2.19 */
-#      define png_snprintf2 snprintf
-#      define png_snprintf6 snprintf
-#    endif
-#  else
-     /* You don't have or don't want to use snprintf().  Caution: Using
-      * sprintf instead of snprintf exposes your application to accidental
-      * or malevolent buffer overflows.  If you don't have snprintf()
-      * as a general rule you should provide one (you can get one from
-      * Portable OpenSSH). */
-#    define png_snprintf(s1,n,fmt,x1) sprintf(s1,fmt,x1)
-#    define png_snprintf2(s1,n,fmt,x1,x2) sprintf(s1,fmt,x1,x2)
-#    define png_snprintf6(s1,n,fmt,x1,x2,x3,x4,x5,x6) \
-        sprintf(s1,fmt,x1,x2,x3,x4,x5,x6)
-#  endif
-#  define png_strlen  strlen
-#  define png_memcmp  memcmp      /* SJT: added */
-#  define png_memcpy  memcpy
-#  define png_memset  memset
-#endif
-/* End of memory model independent support */
-
-/* Just a little check that someone hasn't tried to define something
- * contradictory.
- */
-#if (PNG_ZBUF_SIZE > 65536L) && defined(PNG_MAX_MALLOC_64K)
-#  undef PNG_ZBUF_SIZE
-#  define PNG_ZBUF_SIZE 65536L
-#endif
-
-/* Added at libpng-1.2.8 */
-#endif /* PNG_VERSION_INFO_ONLY */
-
-#endif /* PNGCONF_H */
diff --git a/source/libpng/pngu/pngu.c b/source/libpng/pngu/pngu.c
deleted file mode 100644
index e2cfb7f..0000000
--- a/source/libpng/pngu/pngu.c
+++ /dev/null
@@ -1,1132 +0,0 @@
-/********************************************************************************************
-
-PNGU Version : 0.2a
-
-Coder : frontier
-
-More info : http://frontier-dev.net
-
-********************************************************************************************/
-#include <stdio.h>
-#include <malloc.h>
-#include "pngu.h"
-#include "../png.h"
-
-
-// Constants
-#define PNGU_SOURCE_BUFFER			1
-#define PNGU_SOURCE_DEVICE			2
-
-
-// Prototypes of helper functions
-int pngu_info (IMGCTX ctx);
-int pngu_decode (IMGCTX ctx, PNGU_u32 width, PNGU_u32 height, PNGU_u32 stripAlpha);
-void pngu_free_info (IMGCTX ctx);
-void pngu_read_data_from_buffer (png_structp png_ptr, png_bytep data, png_size_t length);
-void pngu_write_data_to_buffer (png_structp png_ptr, png_bytep data, png_size_t length);
-void pngu_flush_data_to_buffer (png_structp png_ptr);
-int pngu_clamp (int value, int min, int max);
-
-
-// PNGU Image context struct
-struct _IMGCTX
-{
-	int source;
-	void *buffer;
-	char *filename;
-	PNGU_u32 cursor;
-
-	PNGU_u32 propRead;
-	PNGUPROP prop;
-
-	PNGU_u32 infoRead;
-	png_structp png_ptr;
-	png_infop info_ptr;
-	FILE *fd;
-	
-	png_bytep *row_pointers;
-	png_bytep img_data;
-};
-
-
-// PNGU Implementation //
-
-IMGCTX PNGU_SelectImageFromBuffer (const void *buffer)
-{
-	IMGCTX ctx = NULL;
-
-	if (!buffer)
-		return NULL;
-
-	ctx = malloc (sizeof (struct _IMGCTX));
-	if (!ctx)
-		return NULL;
-
-	ctx->buffer = (void *) buffer;
-	ctx->source = PNGU_SOURCE_BUFFER;
-	ctx->cursor = 0;
-	ctx->filename = NULL;
-	ctx->propRead = 0;
-	ctx->infoRead = 0;
-
-	return ctx;
-}
-
-
-IMGCTX PNGU_SelectImageFromDevice (const char *filename)
-{
-	IMGCTX ctx = NULL;
-
-	if (!filename)
-		return NULL;
-
-	ctx = malloc (sizeof (struct _IMGCTX));
-	if (!ctx)
-		return NULL;
-
-	ctx->buffer = NULL;
-	ctx->source = PNGU_SOURCE_DEVICE;
-	ctx->cursor = 0;
-
-	ctx->filename = malloc (strlen (filename) + 1);
-	if (!ctx->filename)
-	{
-		free (ctx);
-		return NULL;
-	}
-	strcpy(ctx->filename, filename);
-
-	ctx->propRead = 0;
-	ctx->infoRead = 0;
-
-	return ctx;
-}
-
-
-void PNGU_ReleaseImageContext (IMGCTX ctx)
-{
-	if (!ctx)
-		return;
-
-	if (ctx->filename)
-		free (ctx->filename);
-
-	if ((ctx->propRead) && (ctx->prop.trans))
-		free (ctx->prop.trans);
-
-	pngu_free_info (ctx);
-
-	free (ctx);
-}
-
-
-int PNGU_GetImageProperties (IMGCTX ctx, PNGUPROP *imgprop)
-{
-	int res;
-
-	if (!ctx->propRead)
-	{
-		res = pngu_info (ctx);
-		if (res != PNGU_OK)
-			return res;
-	}
-
-	*imgprop = ctx->prop;
-
-	return PNGU_OK;
-}
-
-
-int PNGU_DecodeToYCbYCr (IMGCTX ctx, PNGU_u32 width, PNGU_u32 height, void *buffer, PNGU_u32 stride)
-{
-	int result;
-	PNGU_u32 x, y, buffWidth;
-
-	// width needs to be divisible by two
-	if (width % 2)
-		return PNGU_ODD_WIDTH;
-
-	// stride needs to be divisible by two
-	if (stride % 2)
-		return PNGU_ODD_STRIDE;
-
-	result = pngu_decode (ctx, width, height, 1);
-	if (result != PNGU_OK)
-		return result;
-
-	// Copy image to the output buffer
-	buffWidth = (width + stride) / 2;
-	for (y = 0; y < height; y++)
-		for (x = 0; x < (width / 2); x++)
-			((PNGU_u32 *)buffer)[y*buffWidth+x] = PNGU_RGB8_TO_YCbYCr (*(ctx->row_pointers[y]+x*6), *(ctx->row_pointers[y]+x*6+1), *(ctx->row_pointers[y]+x*6+2),
-															*(ctx->row_pointers[y]+x*6+3), *(ctx->row_pointers[y]+x*6+4), *(ctx->row_pointers[y]+x*6+5));
-	
-	// Free resources
-	free (ctx->img_data);
-	free (ctx->row_pointers);
-
-	// Success
-	return PNGU_OK;
-}
-
-
-int PNGU_DecodeToRGB565 (IMGCTX ctx, PNGU_u32 width, PNGU_u32 height, void *buffer, PNGU_u32 stride)
-{
-	int result;
-	PNGU_u32 x, y, buffWidth;
-	
-	result = pngu_decode (ctx, width, height, 1);
-	if (result != PNGU_OK)
-		return result;
-
-	buffWidth = width + stride;
-
-	// Copy image to the output buffer
-	for (y = 0; y < height; y++)
-		for (x = 0; x < width; x++)
-			((PNGU_u16 *)buffer)[y*buffWidth+x] = 
-				(((PNGU_u16) (ctx->row_pointers[y][x*3] & 0xF8)) << 8) | 
-				(((PNGU_u16) (ctx->row_pointers[y][x*3+1] & 0xFC)) << 3) | 
-				(((PNGU_u16) (ctx->row_pointers[y][x*3+2] & 0xF8)) >> 3);
-	
-	// Free resources
-	free (ctx->img_data);
-	free (ctx->row_pointers);
-
-	// Success
-	return PNGU_OK;
-}
-
-
-int PNGU_DecodeToRGBA8 (IMGCTX ctx, PNGU_u32 width, PNGU_u32 height, void *buffer, PNGU_u32 stride, PNGU_u8 default_alpha)
-{
-	int result;
-	PNGU_u32 x, y, buffWidth;
-	
-	result = pngu_decode (ctx, width, height, 0);
-	if (result != PNGU_OK)
-		return result;
-
-	buffWidth = width + stride;
-
-	// Check is source image has an alpha channel
-	if ( (ctx->prop.imgColorType == PNGU_COLOR_TYPE_GRAY_ALPHA) || (ctx->prop.imgColorType == PNGU_COLOR_TYPE_RGB_ALPHA) )
-	{
-		// Alpha channel present, copy image to the output buffer
-		for (y = 0; y < height; y++)
-			memcpy (buffer + (y * buffWidth * 4), ctx->row_pointers[y], width * 4);
-	}
-	else
-	{
-		// No alpha channel present, copy image to the output buffer
-		for (y = 0; y < height; y++)
-			for (x = 0; x < width; x++)
-				((PNGU_u32 *)buffer)[y*buffWidth+x] = 
-					(((PNGU_u32) ctx->row_pointers[y][x*3]) << 24) | 
-					(((PNGU_u32) ctx->row_pointers[y][x*3+1]) << 16) | 
-					(((PNGU_u32) ctx->row_pointers[y][x*3+2]) << 8) | 
-					((PNGU_u32) default_alpha);
-	}
-	
-	// Free resources
-	free (ctx->img_data);
-	free (ctx->row_pointers);
-
-	// Success
-	return PNGU_OK;
-}
-
-
-int PNGU_DecodeTo4x4RGB565 (IMGCTX ctx, PNGU_u32 width, PNGU_u32 height, void *buffer)
-{
-	int result;
-	PNGU_u32 x, y, qwidth, qheight;
-
-	// width and height need to be divisible by four
-	if ((width % 4) || (height % 4))
-		return PNGU_INVALID_WIDTH_OR_HEIGHT;
-
-	result = pngu_decode (ctx, width, height, 1);
-	if (result != PNGU_OK)
-		return result;
-
-	// Copy image to the output buffer
-	qwidth = width / 4;
-	qheight = height / 4;
-
-	for (y = 0; y < qheight; y++)
-		for (x = 0; x < qwidth; x++)
-		{
-			int blockbase = (y * qwidth + x) * 4;
-
-			PNGU_u64 field64 = *((PNGU_u64 *)(ctx->row_pointers[y*4]+x*12));
-			PNGU_u64 field32 = (PNGU_u64) *((PNGU_u32 *)(ctx->row_pointers[y*4]+x*12+8));
-			((PNGU_u64 *) buffer)[blockbase] = 
-				(((field64 & 0xF800000000000000ULL) | ((field64 & 0xFC000000000000ULL) << 3) | ((field64 & 0xF80000000000ULL) << 5)) | 
-				(((field64 & 0xF800000000ULL) << 8) | ((field64 & 0xFC000000ULL) << 11) | ((field64 & 0xF80000ULL) << 13)) | 
-				(((field64 & 0xF800ULL) << 16) | ((field64 & 0xFCULL) << 19) | ((field32 & 0xF8000000ULL) >> 11)) |
-				(((field32 & 0xF80000ULL) >> 8) | ((field32 & 0xFC00ULL) >> 5) | ((field32 & 0xF8ULL) >> 3)));
-
-			field64 = *((PNGU_u64 *)(ctx->row_pointers[y*4+1]+x*12));
-			field32 = (PNGU_u64) *((PNGU_u32 *)(ctx->row_pointers[y*4+1]+x*12+8));
-			((PNGU_u64 *) buffer)[blockbase+1] = 
-				(((field64 & 0xF800000000000000ULL) | ((field64 & 0xFC000000000000ULL) << 3) | ((field64 & 0xF80000000000ULL) << 5)) | 
-				(((field64 & 0xF800000000ULL) << 8) | ((field64 & 0xFC000000ULL) << 11) | ((field64 & 0xF80000ULL) << 13)) | 
-				(((field64 & 0xF800ULL) << 16) | ((field64 & 0xFCULL) << 19) | ((field32 & 0xF8000000ULL) >> 11)) |
-				(((field32 & 0xF80000ULL) >> 8) | ((field32 & 0xFC00ULL) >> 5) | ((field32 & 0xF8ULL) >> 3)));
-
-			field64 = *((PNGU_u64 *)(ctx->row_pointers[y*4+2]+x*12));
-			field32 = (PNGU_u64) *((PNGU_u32 *)(ctx->row_pointers[y*4+2]+x*12+8));
-			((PNGU_u64 *) buffer)[blockbase+2] = 
-				(((field64 & 0xF800000000000000ULL) | ((field64 & 0xFC000000000000ULL) << 3) | ((field64 & 0xF80000000000ULL) << 5)) | 
-				(((field64 & 0xF800000000ULL) << 8) | ((field64 & 0xFC000000ULL) << 11) | ((field64 & 0xF80000ULL) << 13)) | 
-				(((field64 & 0xF800ULL) << 16) | ((field64 & 0xFCULL) << 19) | ((field32 & 0xF8000000ULL) >> 11)) |
-				(((field32 & 0xF80000ULL) >> 8) | ((field32 & 0xFC00ULL) >> 5) | ((field32 & 0xF8ULL) >> 3)));
-
-			field64 = *((PNGU_u64 *)(ctx->row_pointers[y*4+3]+x*12));
-			field32 = (PNGU_u64) *((PNGU_u32 *)(ctx->row_pointers[y*4+3]+x*12+8));
-			((PNGU_u64 *) buffer)[blockbase+3] = 
-				(((field64 & 0xF800000000000000ULL) | ((field64 & 0xFC000000000000ULL) << 3) | ((field64 & 0xF80000000000ULL) << 5)) | 
-				(((field64 & 0xF800000000ULL) << 8) | ((field64 & 0xFC000000ULL) << 11) | ((field64 & 0xF80000ULL) << 13)) | 
-				(((field64 & 0xF800ULL) << 16) | ((field64 & 0xFCULL) << 19) | ((field32 & 0xF8000000ULL) >> 11)) |
-				(((field32 & 0xF80000ULL) >> 8) | ((field32 & 0xFC00ULL) >> 5) | ((field32 & 0xF8ULL) >> 3)));
-		}
-	
-	// Free resources
-	free (ctx->img_data);
-	free (ctx->row_pointers);
-
-	// Success
-	return PNGU_OK;
-}
-
-
-int PNGU_DecodeTo4x4RGB5A3 (IMGCTX ctx, PNGU_u32 width, PNGU_u32 height, void *buffer, PNGU_u8 default_alpha)
-{
-	int result;
-	PNGU_u32 x, y, qwidth, qheight;
-	PNGU_u64 alphaMask;
-
-	// width and height need to be divisible by four
-	if ((width % 4) || (height % 4))
-		return PNGU_INVALID_WIDTH_OR_HEIGHT;
-
-	result = pngu_decode (ctx, width, height, 0);
-	if (result != PNGU_OK)
-		return result;
-
-	// Init some vars
-	qwidth = width / 4;
-	qheight = height / 4;
-
-	// Check is source image has an alpha channel
-	if ( (ctx->prop.imgColorType == PNGU_COLOR_TYPE_GRAY_ALPHA) || (ctx->prop.imgColorType == PNGU_COLOR_TYPE_RGB_ALPHA) )
-	{
-		// Alpha channel present, copy image to the output buffer
-		for (y = 0; y < qheight; y++)
-			for (x = 0; x < qwidth; x++)
-			{
-				int blockbase = (y * qwidth + x) * 4;
-				PNGU_u64 tmp;
-
-				PNGU_u64 fieldA = *((PNGU_u64 *)(ctx->row_pointers[y*4]+x*16));
-				PNGU_u64 fieldB = *((PNGU_u64 *)(ctx->row_pointers[y*4]+x*16+8));
-				// If first pixel is opaque set MSB to 1 and encode colors in RGB555, else set MSB to 0 and encode colors in ARGB3444
-				if ((fieldA & 0xE000000000ULL) == 0xE000000000ULL)			
-					tmp = 0x8000000000000000ULL | ((fieldA & 0xF800000000000000ULL) >> 1) | ((fieldA & 0xF8000000000000ULL) << 2) | ((fieldA & 0xF80000000000ULL) << 5);
-				else
-					tmp = ((fieldA & 0xE000000000ULL) << 23) | ((fieldA & 0xF000000000000000ULL) >> 4) | (fieldA & 0xF0000000000000ULL) | ((fieldA & 0xF00000000000ULL) << 4);
-
-				// If second pixel is opaque set MSB to 1 and encode colors in RGB555, else set MSB to 0 and encode colors in ARGB3444
-				if ((fieldA & 0xE0ULL) == 0xE0ULL)
-					tmp = tmp | 0x800000000000ULL | ((fieldA & 0xF8000000ULL) << 15) | ((fieldA & 0xF80000ULL) << 18) | ((fieldA & 0xF800ULL) << 21);
-				else
-					tmp = tmp | ((fieldA & 0xE0ULL) << 39) | ((fieldA & 0xF0000000ULL) << 12) | ((fieldA & 0xF00000ULL) << 16) | ((fieldA & 0xF000ULL) << 20);
-
-				// If third pixel is opaque set MSB to 1 and encode colors in RGB555, else set MSB to 0 and encode colors in ARGB3444
-				if ((fieldB & 0xE000000000ULL) == 0xE000000000ULL)
-					tmp = tmp | 0x80000000ULL | ((fieldB & 0xF800000000000000ULL) >> 33) | ((fieldB & 0xF8000000000000ULL) >> 30) | ((fieldB & 0xF80000000000ULL) >> 27);
-				else
-					tmp = tmp | ((fieldB & 0xE000000000ULL) >> 9) | ((fieldB & 0xF000000000000000ULL) >> 36) | ((fieldB & 0xF0000000000000ULL) >> 32) | ((fieldB & 0xF00000000000ULL) >> 28);
-
-				// If fourth pixel is opaque set MSB to 1 and encode colors in RGB555, else set MSB to 0 and encode colors in ARGB3444
-				if ((fieldB & 0xE0ULL) == 0xE0ULL)
-					tmp = tmp | 0x8000ULL | ((fieldB & 0xF8000000ULL) >> 17) | ((fieldB & 0xF80000ULL) >> 14) | ((fieldB & 0xF800ULL) >> 11);
-				else
-					tmp = tmp | ((fieldB & 0xE0ULL) << 7) | ((fieldB & 0xF0000000ULL) >> 20) | ((fieldB & 0xF00000ULL) >> 16) | ((fieldB & 0xF000ULL) >> 12);
-				((PNGU_u64 *) buffer)[blockbase] = tmp;
-
-				fieldA = *((PNGU_u64 *)(ctx->row_pointers[y*4+1]+x*16));
-				fieldB = *((PNGU_u64 *)(ctx->row_pointers[y*4+1]+x*16+8));
-				if ((fieldA & 0xE000000000ULL) == 0xE000000000ULL)
-					// Opaque pixel, so set MSB to 1 and encode colors in RGB555
-					tmp = 0x8000000000000000ULL | ((fieldA & 0xF800000000000000ULL) >> 1) | ((fieldA & 0xF8000000000000ULL) << 2) | ((fieldA & 0xF80000000000ULL) << 5);
-				else
-					// Tranlucid pixel, so set MSB to 0 and encode colors in ARGB3444
-					tmp = ((fieldA & 0xE000000000ULL) << 23) | ((fieldA & 0xF000000000000000ULL) >> 4) | (fieldA & 0xF0000000000000ULL) | ((fieldA & 0xF00000000000ULL) << 4);
-
-				if ((fieldA & 0xE0ULL) == 0xE0ULL)
-					// Opaque pixel, so set MSB to 1 and encode colors in RGB555
-					tmp = tmp | 0x800000000000ULL | ((fieldA & 0xF8000000ULL) << 15) | ((fieldA & 0xF80000ULL) << 18) | ((fieldA & 0xF800ULL) << 21);
-				else
-					// Tranlucid pixel, so set MSB to 0 and encode colors in ARGB3444
-					tmp = tmp | ((fieldA & 0xE0ULL) << 39) | ((fieldA & 0xF0000000ULL) << 12) | ((fieldA & 0xF00000ULL) << 16) | ((fieldA & 0xF000ULL) << 20);
-
-				if ((fieldB & 0xE000000000ULL) == 0xE000000000ULL)
-					// Opaque pixel, so set MSB to 1 and encode colors in RGB555
-					tmp = tmp | 0x80000000ULL | ((fieldB & 0xF800000000000000ULL) >> 33) | ((fieldB & 0xF8000000000000ULL) >> 30) | ((fieldB & 0xF80000000000ULL) >> 27);
-				else
-					// Tranlucid pixel, so set MSB to 0 and encode colors in ARGB3444
-					tmp = tmp | ((fieldB & 0xE000000000ULL) >> 9) | ((fieldB & 0xF000000000000000ULL) >> 36) | ((fieldB & 0xF0000000000000ULL) >> 32) | ((fieldB & 0xF00000000000ULL) >> 28);
-
-				if ((fieldB & 0xE0ULL) == 0xE0ULL)
-					// Opaque pixel, so set MSB to 1 and encode colors in RGB555
-					tmp = tmp | 0x8000ULL | ((fieldB & 0xF8000000ULL) >> 17) | ((fieldB & 0xF80000ULL) >> 14) | ((fieldB & 0xF800ULL) >> 11);
-				else
-					// Tranlucid pixel, so set MSB to 0 and encode colors in ARGB3444
-					tmp = tmp | ((fieldB & 0xE0ULL) << 7) | ((fieldB & 0xF0000000ULL) >> 20) | ((fieldB & 0xF00000ULL) >> 16) | ((fieldB & 0xF000ULL) >> 12);
-				((PNGU_u64 *) buffer)[blockbase+1] = tmp;
-
-				fieldA = *((PNGU_u64 *)(ctx->row_pointers[y*4+2]+x*16));
-				fieldB = *((PNGU_u64 *)(ctx->row_pointers[y*4+2]+x*16+8));
-				if ((fieldA & 0xE000000000ULL) == 0xE000000000ULL)
-					// Opaque pixel, so set MSB to 1 and encode colors in RGB555
-					tmp = 0x8000000000000000ULL | ((fieldA & 0xF800000000000000ULL) >> 1) | ((fieldA & 0xF8000000000000ULL) << 2) | ((fieldA & 0xF80000000000ULL) << 5);
-				else
-					// Tranlucid pixel, so set MSB to 0 and encode colors in ARGB3444
-					tmp = ((fieldA & 0xE000000000ULL) << 23) | ((fieldA & 0xF000000000000000ULL) >> 4) | (fieldA & 0xF0000000000000ULL) | ((fieldA & 0xF00000000000ULL) << 4);
-
-				if ((fieldA & 0xE0ULL) == 0xE0ULL)
-					// Opaque pixel, so set MSB to 1 and encode colors in RGB555
-					tmp = tmp | 0x800000000000ULL | ((fieldA & 0xF8000000ULL) << 15) | ((fieldA & 0xF80000ULL) << 18) | ((fieldA & 0xF800ULL) << 21);
-				else
-					// Tranlucid pixel, so set MSB to 0 and encode colors in ARGB3444
-					tmp = tmp | ((fieldA & 0xE0ULL) << 39) | ((fieldA & 0xF0000000ULL) << 12) | ((fieldA & 0xF00000ULL) << 16) | ((fieldA & 0xF000ULL) << 20);
-
-				if ((fieldB & 0xE000000000ULL) == 0xE000000000ULL)
-					// Opaque pixel, so set MSB to 1 and encode colors in RGB555
-					tmp = tmp | 0x80000000ULL | ((fieldB & 0xF800000000000000ULL) >> 33) | ((fieldB & 0xF8000000000000ULL) >> 30) | ((fieldB & 0xF80000000000ULL) >> 27);
-				else
-					// Tranlucid pixel, so set MSB to 0 and encode colors in ARGB3444
-					tmp = tmp | ((fieldB & 0xE000000000ULL) >> 9) | ((fieldB & 0xF000000000000000ULL) >> 36) | ((fieldB & 0xF0000000000000ULL) >> 32) | ((fieldB & 0xF00000000000ULL) >> 28);
-
-				if ((fieldB & 0xE0ULL) == 0xE0ULL)
-					// Opaque pixel, so set MSB to 1 and encode colors in RGB555
-					tmp = tmp | 0x8000ULL | ((fieldB & 0xF8000000ULL) >> 17) | ((fieldB & 0xF80000ULL) >> 14) | ((fieldB & 0xF800ULL) >> 11);
-				else
-					// Tranlucid pixel, so set MSB to 0 and encode colors in ARGB3444
-					tmp = tmp | ((fieldB & 0xE0ULL) << 7) | ((fieldB & 0xF0000000ULL) >> 20) | ((fieldB & 0xF00000ULL) >> 16) | ((fieldB & 0xF000ULL) >> 12);
-				((PNGU_u64 *) buffer)[blockbase+2] = tmp;
-
-				fieldA = *((PNGU_u64 *)(ctx->row_pointers[y*4+3]+x*16));
-				fieldB = *((PNGU_u64 *)(ctx->row_pointers[y*4+3]+x*16+8));
-				if ((fieldA & 0xE000000000ULL) == 0xE000000000ULL)
-					// Opaque pixel, so set MSB to 1 and encode colors in RGB555
-					tmp = 0x8000000000000000ULL | ((fieldA & 0xF800000000000000ULL) >> 1) | ((fieldA & 0xF8000000000000ULL) << 2) | ((fieldA & 0xF80000000000ULL) << 5);
-				else
-					// Tranlucid pixel, so set MSB to 0 and encode colors in ARGB3444
-					tmp = ((fieldA & 0xE000000000ULL) << 23) | ((fieldA & 0xF000000000000000ULL) >> 4) | (fieldA & 0xF0000000000000ULL) | ((fieldA & 0xF00000000000ULL) << 4);
-
-				if ((fieldA & 0xE0ULL) == 0xE0ULL)
-					// Opaque pixel, so set MSB to 1 and encode colors in RGB555
-					tmp = tmp | 0x800000000000ULL | ((fieldA & 0xF8000000ULL) << 15) | ((fieldA & 0xF80000ULL) << 18) | ((fieldA & 0xF800ULL) << 21);
-				else
-					// Tranlucid pixel, so set MSB to 0 and encode colors in ARGB3444
-					tmp = tmp | ((fieldA & 0xE0ULL) << 39) | ((fieldA & 0xF0000000ULL) << 12) | ((fieldA & 0xF00000ULL) << 16) | ((fieldA & 0xF000ULL) << 20);
-
-				if ((fieldB & 0xE000000000ULL) == 0xE000000000ULL)
-					// Opaque pixel, so set MSB to 1 and encode colors in RGB555
-					tmp = tmp | 0x80000000ULL | ((fieldB & 0xF800000000000000ULL) >> 33) | ((fieldB & 0xF8000000000000ULL) >> 30) | ((fieldB & 0xF80000000000ULL) >> 27);
-				else
-					// Tranlucid pixel, so set MSB to 0 and encode colors in ARGB3444
-					tmp = tmp | ((fieldB & 0xE000000000ULL) >> 9) | ((fieldB & 0xF000000000000000ULL) >> 36) | ((fieldB & 0xF0000000000000ULL) >> 32) | ((fieldB & 0xF00000000000ULL) >> 28);
-
-				if ((fieldB & 0xE0ULL) == 0xE0ULL)
-					// Opaque pixel, so set MSB to 1 and encode colors in RGB555
-					tmp = tmp | 0x8000ULL | ((fieldB & 0xF8000000ULL) >> 17) | ((fieldB & 0xF80000ULL) >> 14) | ((fieldB & 0xF800ULL) >> 11);
-				else
-					// Tranlucid pixel, so set MSB to 0 and encode colors in ARGB3444
-					tmp = tmp | ((fieldB & 0xE0ULL) << 7) | ((fieldB & 0xF0000000ULL) >> 20) | ((fieldB & 0xF00000ULL) >> 16) | ((fieldB & 0xF000ULL) >> 12);
-				((PNGU_u64 *) buffer)[blockbase+3] = tmp;
-			}
-	}
-	else
-	{
-		// No alpha channel present, copy image to the output buffer
-		default_alpha = (default_alpha >> 5);
-		if (default_alpha == 7)
-		{
-			// The user wants an opaque texture, so set MSB to 1 and encode colors in RGB555
-			alphaMask = 0x8000800080008000ULL;
-
-			for (y = 0; y < qheight; y++)
-				for (x = 0; x < qwidth; x++)
-				{
-					int blockbase = (y * qwidth + x) * 4;
-
-					PNGU_u64 field64 = *((PNGU_u64 *)(ctx->row_pointers[y*4]+x*12));
-					PNGU_u64 field32 = (PNGU_u64) *((PNGU_u32 *)(ctx->row_pointers[y*4]+x*12+8));
-					((PNGU_u64 *) buffer)[blockbase] = 
-						 alphaMask | ((field64 & 0xF800000000000000ULL) >> 1) | ((field64 & 0xF8000000000000ULL) << 2) |
-						((field64 & 0xF80000000000ULL) << 5) | ((field64 & 0xF800000000ULL) << 7) | ((field64 & 0xF8000000ULL) << 10) |
-						((field64 & 0xF80000ULL) << 13) | ((field64 & 0xF800ULL) << 15) | ((field64 & 0xF8ULL) << 18) | 
-						((field32 & 0xF8000000ULL) >> 11) |	((field32 & 0xF80000ULL) >> 9) | ((field32 & 0xF800ULL) >> 6) | ((field32 & 0xF8ULL) >> 3);
-
-					field64 = *((PNGU_u64 *)(ctx->row_pointers[y*4+1]+x*12));
-					field32 = (PNGU_u64) *((PNGU_u32 *)(ctx->row_pointers[y*4+1]+x*12+8));
-					((PNGU_u64 *) buffer)[blockbase+1] = 
-						alphaMask | ((field64 & 0xF800000000000000ULL) >> 1) | ((field64 & 0xF8000000000000ULL) << 2) |
-						((field64 & 0xF80000000000ULL) << 5) | ((field64 & 0xF800000000ULL) << 7) | ((field64 & 0xF8000000ULL) << 10) |
-						((field64 & 0xF80000ULL) << 13) | ((field64 & 0xF800ULL) << 15) | ((field64 & 0xF8ULL) << 18) | 
-						((field32 & 0xF8000000ULL) >> 11) |	((field32 & 0xF80000ULL) >> 9) | ((field32 & 0xF800ULL) >> 6) | ((field32 & 0xF8ULL) >> 3);
-
-					field64 = *((PNGU_u64 *)(ctx->row_pointers[y*4+2]+x*12));
-					field32 = (PNGU_u64) *((PNGU_u32 *)(ctx->row_pointers[y*4+2]+x*12+8));
-					((PNGU_u64 *) buffer)[blockbase+2] = 
-						alphaMask | ((field64 & 0xF800000000000000ULL) >> 1) | ((field64 & 0xF8000000000000ULL) << 2) |
-						((field64 & 0xF80000000000ULL) << 5) | ((field64 & 0xF800000000ULL) << 7) | ((field64 & 0xF8000000ULL) << 10) |
-						((field64 & 0xF80000ULL) << 13) | ((field64 & 0xF800ULL) << 15) | ((field64 & 0xF8ULL) << 18) | 
-						((field32 & 0xF8000000ULL) >> 11) |	((field32 & 0xF80000ULL) >> 9) | ((field32 & 0xF800ULL) >> 6) | ((field32 & 0xF8ULL) >> 3);
-
-					field64 = *((PNGU_u64 *)(ctx->row_pointers[y*4+3]+x*12));
-					field32 = (PNGU_u64) *((PNGU_u32 *)(ctx->row_pointers[y*4+3]+x*12+8));
-					((PNGU_u64 *) buffer)[blockbase+3] = 
-						alphaMask | ((field64 & 0xF800000000000000ULL) >> 1) | ((field64 & 0xF8000000000000ULL) << 2) |
-						((field64 & 0xF80000000000ULL) << 5) | ((field64 & 0xF800000000ULL) << 7) | ((field64 & 0xF8000000ULL) << 10) |
-						((field64 & 0xF80000ULL) << 13) | ((field64 & 0xF800ULL) << 15) | ((field64 & 0xF8ULL) << 18) | 
-						((field32 & 0xF8000000ULL) >> 11) |	((field32 & 0xF80000ULL) >> 9) | ((field32 & 0xF800ULL) >> 6) | ((field32 & 0xF8ULL) >> 3);
-				}
-		}
-		else
-		{
-			// The user wants a translucid texture, so set MSB to 0 and encode colors in ARGB3444
-			default_alpha = (default_alpha << 4);
-			alphaMask = (((PNGU_u64) default_alpha) << 56) | (((PNGU_u64) default_alpha) << 40) |
-						(((PNGU_u64) default_alpha) << 24) | (((PNGU_u64) default_alpha) << 8);
-
-			for (y = 0; y < qheight; y++)
-				for (x = 0; x < qwidth; x++)
-				{
-					int blockbase = (y * qwidth + x) * 4;
-
-					PNGU_u64 field64 = *((PNGU_u64 *)(ctx->row_pointers[y*4]+x*12));
-					PNGU_u64 field32 = (PNGU_u64) *((PNGU_u32 *)(ctx->row_pointers[y*4]+x*12+8));
-					((PNGU_u64 *) buffer)[blockbase] = 
-						alphaMask | ((field64 & 0xF000000000000000ULL) >> 4) | (field64 & 0xF0000000000000ULL) | ((field64 & 0xF00000000000ULL) << 4) | 
-						((field64 & 0xF000000000ULL) << 4) | ((field64 & 0xF0000000ULL) << 8) | ((field64 & 0xF00000ULL) << 12) | 
-						((field64 & 0xF000ULL) << 12) | ((field64 & 0xF0ULL) << 16) | ((field32 & 0xF0000000ULL) >> 12) |	
-						((field32 & 0xF00000ULL) >> 12) | ((field32 & 0xF000ULL) >> 8) | ((field32 & 0xF0ULL) >> 4);
-
-					field64 = *((PNGU_u64 *)(ctx->row_pointers[y*4+1]+x*12));
-					field32 = (PNGU_u64) *((PNGU_u32 *)(ctx->row_pointers[y*4+1]+x*12+8));
-					((PNGU_u64 *) buffer)[blockbase+1] = 
-						alphaMask | ((field64 & 0xF000000000000000ULL) >> 4) | (field64 & 0xF0000000000000ULL) | ((field64 & 0xF00000000000ULL) << 4) | 
-						((field64 & 0xF000000000ULL) << 4) | ((field64 & 0xF0000000ULL) << 8) | ((field64 & 0xF00000ULL) << 12) | 
-						((field64 & 0xF000ULL) << 12) | ((field64 & 0xF0ULL) << 16) | ((field32 & 0xF0000000ULL) >> 12) |	
-						((field32 & 0xF00000ULL) >> 12) | ((field32 & 0xF000ULL) >> 8) | ((field32 & 0xF0ULL) >> 4);
-
-					field64 = *((PNGU_u64 *)(ctx->row_pointers[y*4+2]+x*12));
-					field32 = (PNGU_u64) *((PNGU_u32 *)(ctx->row_pointers[y*4+2]+x*12+8));
-					((PNGU_u64 *) buffer)[blockbase+2] = 
-						alphaMask | ((field64 & 0xF000000000000000ULL) >> 4) | (field64 & 0xF0000000000000ULL) | ((field64 & 0xF00000000000ULL) << 4) | 
-						((field64 & 0xF000000000ULL) << 4) | ((field64 & 0xF0000000ULL) << 8) | ((field64 & 0xF00000ULL) << 12) | 
-						((field64 & 0xF000ULL) << 12) | ((field64 & 0xF0ULL) << 16) | ((field32 & 0xF0000000ULL) >> 12) |	
-						((field32 & 0xF00000ULL) >> 12) | ((field32 & 0xF000ULL) >> 8) | ((field32 & 0xF0ULL) >> 4);
-
-					field64 = *((PNGU_u64 *)(ctx->row_pointers[y*4+3]+x*12));
-					field32 = (PNGU_u64) *((PNGU_u32 *)(ctx->row_pointers[y*4+3]+x*12+8));
-					((PNGU_u64 *) buffer)[blockbase+3] = 
-						alphaMask | ((field64 & 0xF000000000000000ULL) >> 4) | (field64 & 0xF0000000000000ULL) | ((field64 & 0xF00000000000ULL) << 4) | 
-						((field64 & 0xF000000000ULL) << 4) | ((field64 & 0xF0000000ULL) << 8) | ((field64 & 0xF00000ULL) << 12) | 
-						((field64 & 0xF000ULL) << 12) | ((field64 & 0xF0ULL) << 16) | ((field32 & 0xF0000000ULL) >> 12) |	
-						((field32 & 0xF00000ULL) >> 12) | ((field32 & 0xF000ULL) >> 8) | ((field32 & 0xF0ULL) >> 4);
-				}
-		}
-	}
-	
-	// Free resources
-	free (ctx->img_data);
-	free (ctx->row_pointers);
-
-	// Success
-	return PNGU_OK;
-}
-
-
-int PNGU_DecodeTo4x4RGBA8 (IMGCTX ctx, PNGU_u32 width, PNGU_u32 height, void *buffer, PNGU_u8 default_alpha)
-{
-	int result;
-	PNGU_u32 x, y, qwidth, qheight;
-	PNGU_u64 alphaMask;
-
-	// width and height need to be divisible by four
-	if ((width % 4) || (height % 4))
-		return PNGU_INVALID_WIDTH_OR_HEIGHT;
-
-	result = pngu_decode (ctx, width, height, 0);
-	if (result != PNGU_OK)
-		return result;
-
-	// Init some variables
-	qwidth = width / 4;
-	qheight = height / 4;
-
-	// Check is source image has an alpha channel
-	if ( (ctx->prop.imgColorType == PNGU_COLOR_TYPE_GRAY_ALPHA) || (ctx->prop.imgColorType == PNGU_COLOR_TYPE_RGB_ALPHA) )
-	{
-		// Alpha channel present, copy image to the output buffer
-		for (y = 0; y < qheight; y++)
-			for (x = 0; x < qwidth; x++)
-			{
-				int blockbase = (y * qwidth + x) * 8;
-
-				PNGU_u64 fieldA = *((PNGU_u64 *)(ctx->row_pointers[y*4]+x*16));
-				PNGU_u64 fieldB = *((PNGU_u64 *)(ctx->row_pointers[y*4]+x*16+8));
-				((PNGU_u64 *) buffer)[blockbase] = 
-					((fieldA & 0xFF00000000ULL) << 24) | ((fieldA & 0xFF00000000000000ULL) >> 8) | 
-					((fieldA & 0xFFULL) << 40) | ((fieldA & 0xFF000000ULL) << 8) | 
-					((fieldB & 0xFF00000000ULL) >> 8) | ((fieldB & 0xFF00000000000000ULL) >> 40) | 
-					((fieldB & 0xFFULL) << 8) | ((fieldB & 0xFF000000ULL) >> 24);
-				((PNGU_u64 *) buffer)[blockbase+4] =
-					((fieldA & 0xFFFF0000000000ULL) << 8) | ((fieldA & 0xFFFF00ULL) << 24) |
-					((fieldB & 0xFFFF0000000000ULL) >> 24) | ((fieldB & 0xFFFF00ULL) >> 8);
-
-				fieldA = *((PNGU_u64 *)(ctx->row_pointers[y*4+1]+x*16));
-				fieldB = *((PNGU_u64 *)(ctx->row_pointers[y*4+1]+x*16+8));
-				((PNGU_u64 *) buffer)[blockbase+1] = 
-					((fieldA & 0xFF00000000ULL) << 24) | ((fieldA & 0xFF00000000000000ULL) >> 8) | 
-					((fieldA & 0xFFULL) << 40) | ((fieldA & 0xFF000000ULL) << 8) | 
-					((fieldB & 0xFF00000000ULL) >> 8) | ((fieldB & 0xFF00000000000000ULL) >> 40) | 
-					((fieldB & 0xFFULL) << 8) | ((fieldB & 0xFF000000ULL) >> 24);
-				((PNGU_u64 *) buffer)[blockbase+5] =
-					((fieldA & 0xFFFF0000000000ULL) << 8) | ((fieldA & 0xFFFF00ULL) << 24) |
-					((fieldB & 0xFFFF0000000000ULL) >> 24) | ((fieldB & 0xFFFF00ULL) >> 8);
-
-				fieldA = *((PNGU_u64 *)(ctx->row_pointers[y*4+2]+x*16));
-				fieldB = *((PNGU_u64 *)(ctx->row_pointers[y*4+2]+x*16+8));
-				((PNGU_u64 *) buffer)[blockbase+2] = 
-					((fieldA & 0xFF00000000ULL) << 24) | ((fieldA & 0xFF00000000000000ULL) >> 8) | 
-					((fieldA & 0xFFULL) << 40) | ((fieldA & 0xFF000000ULL) << 8) | 
-					((fieldB & 0xFF00000000ULL) >> 8) | ((fieldB & 0xFF00000000000000ULL) >> 40) | 
-					((fieldB & 0xFFULL) << 8) | ((fieldB & 0xFF000000ULL) >> 24);
-				((PNGU_u64 *) buffer)[blockbase+6] =
-					((fieldA & 0xFFFF0000000000ULL) << 8) | ((fieldA & 0xFFFF00ULL) << 24) |
-					((fieldB & 0xFFFF0000000000ULL) >> 24) | ((fieldB & 0xFFFF00ULL) >> 8);
-
-				fieldA = *((PNGU_u64 *)(ctx->row_pointers[y*4+3]+x*16));
-				fieldB = *((PNGU_u64 *)(ctx->row_pointers[y*4+3]+x*16+8));
-				((PNGU_u64 *) buffer)[blockbase+3] = 
-					((fieldA & 0xFF00000000ULL) << 24) | ((fieldA & 0xFF00000000000000ULL) >> 8) | 
-					((fieldA & 0xFFULL) << 40) | ((fieldA & 0xFF000000ULL) << 8) | 
-					((fieldB & 0xFF00000000ULL) >> 8) | ((fieldB & 0xFF00000000000000ULL) >> 40) | 
-					((fieldB & 0xFFULL) << 8) | ((fieldB & 0xFF000000ULL) >> 24);
-				((PNGU_u64 *) buffer)[blockbase+7] =
-					((fieldA & 0xFFFF0000000000ULL) << 8) | ((fieldA & 0xFFFF00ULL) << 24) |
-					((fieldB & 0xFFFF0000000000ULL) >> 24) | ((fieldB & 0xFFFF00ULL) >> 8);
-			}
-	}
-	else
-	{
-		// No alpha channel present, copy image to the output buffer
-		alphaMask = (((PNGU_u64)default_alpha) << 56) | (((PNGU_u64)default_alpha) << 40) |
-					(((PNGU_u64)default_alpha) << 24) | (((PNGU_u64)default_alpha) << 8);
-
-		for (y = 0; y < qheight; y++)
-			for (x = 0; x < qwidth; x++)
-			{
-				int blockbase = (y * qwidth + x) * 8;
-
-				PNGU_u64 field64 = *((PNGU_u64 *)(ctx->row_pointers[y*4]+x*12));
-				PNGU_u64 field32 = (PNGU_u64) *((PNGU_u32 *)(ctx->row_pointers[y*4]+x*12+8));
-				((PNGU_u64 *) buffer)[blockbase] = 
-					(((field64 & 0xFF00000000000000ULL) >> 8) | (field64 & 0xFF00000000ULL) | 
-					((field64 & 0xFF00ULL) << 8) | ((field32 & 0xFF0000ULL) >> 16) | alphaMask);
-				((PNGU_u64 *) buffer)[blockbase+4] =
-					(((field64 & 0xFFFF0000000000ULL) << 8) | ((field64 & 0xFFFF0000ULL) << 16) |
-					((field64 & 0xFFULL) << 24) | ((field32 & 0xFF000000ULL) >> 8) | (field32 & 0xFFFFULL));
-
-				field64 = *((PNGU_u64 *)(ctx->row_pointers[y*4+1]+x*12));
-				field32 = (PNGU_u64) *((PNGU_u32 *)(ctx->row_pointers[y*4+1]+x*12+8));
-				((PNGU_u64 *) buffer)[blockbase+1] = 
-					(((field64 & 0xFF00000000000000ULL) >> 8) | (field64 & 0xFF00000000ULL) | 
-					((field64 & 0xFF00ULL) << 8) | ((field32 & 0xFF0000ULL) >> 16) | alphaMask);
-				((PNGU_u64 *) buffer)[blockbase+5] =
-					(((field64 & 0xFFFF0000000000ULL) << 8) | ((field64 & 0xFFFF0000ULL) << 16) |
-					((field64 & 0xFFULL) << 24) | ((field32 & 0xFF000000ULL) >> 8) | (field32 & 0xFFFFULL));
-
-				field64 = *((PNGU_u64 *)(ctx->row_pointers[y*4+2]+x*12));
-				field32 = (PNGU_u64) *((PNGU_u32 *)(ctx->row_pointers[y*4+2]+x*12+8));
-				((PNGU_u64 *) buffer)[blockbase+2] = 
-					(((field64 & 0xFF00000000000000ULL) >> 8) | (field64 & 0xFF00000000ULL) | 
-					((field64 & 0xFF00ULL) << 8) | ((field32 & 0xFF0000ULL) >> 16) | alphaMask);
-				((PNGU_u64 *) buffer)[blockbase+6] =
-					(((field64 & 0xFFFF0000000000ULL) << 8) | ((field64 & 0xFFFF0000ULL) << 16) |
-					((field64 & 0xFFULL) << 24) | ((field32 & 0xFF000000ULL) >> 8) | (field32 & 0xFFFFULL));
-
-				field64 = *((PNGU_u64 *)(ctx->row_pointers[y*4+3]+x*12));
-				field32 = (PNGU_u64) *((PNGU_u32 *)(ctx->row_pointers[y*4+3]+x*12+8));
-				((PNGU_u64 *) buffer)[blockbase+3] = 
-					(((field64 & 0xFF00000000000000ULL) >> 8) | (field64 & 0xFF00000000ULL) | 
-					((field64 & 0xFF00ULL) << 8) | ((field32 & 0xFF0000ULL) >> 16) | alphaMask);
-				((PNGU_u64 *) buffer)[blockbase+7] =
-					(((field64 & 0xFFFF0000000000ULL) << 8) | ((field64 & 0xFFFF0000ULL) << 16) |
-					((field64 & 0xFFULL) << 24) | ((field32 & 0xFF000000ULL) >> 8) | (field32 & 0xFFFFULL));
-			}
-	}
-	
-	// Free resources
-	free (ctx->img_data);
-	free (ctx->row_pointers);
-
-	// Success
-	return PNGU_OK;
-}
-
-
-int PNGU_EncodeFromYCbYCr (IMGCTX ctx, PNGU_u32 width, PNGU_u32 height, void *buffer, PNGU_u32 stride)
-{
-	png_uint_32 rowbytes;
-	PNGU_u32 x, y, buffWidth;
-
-	// Erase from the context any readed info
-	pngu_free_info (ctx);
-	ctx->propRead = 0;
-
-	// Check if the user has selected a file to write the image
-	if (ctx->source == PNGU_SOURCE_BUFFER);	
-
-	else if (ctx->source == PNGU_SOURCE_DEVICE)
-	{
-		// Open file
-		if (!(ctx->fd = fopen (ctx->filename, "wb")))
-			return PNGU_CANT_OPEN_FILE;
-	}
-
-	else
-		return PNGU_NO_FILE_SELECTED;
-
-	// Allocation of libpng structs
-	ctx->png_ptr = png_create_write_struct (PNG_LIBPNG_VER_STRING, NULL, NULL, NULL);
-    if (!(ctx->png_ptr))
-	{
-		if (ctx->source == PNGU_SOURCE_DEVICE)
-			fclose (ctx->fd);
-        return PNGU_LIB_ERROR;
-	}
-
-    ctx->info_ptr = png_create_info_struct (ctx->png_ptr);
-    if (!(ctx->info_ptr))
-    {
-		png_destroy_write_struct (&(ctx->png_ptr), (png_infopp)NULL);
-		if (ctx->source == PNGU_SOURCE_DEVICE)
-			fclose (ctx->fd);
-        return PNGU_LIB_ERROR;
-    }
-
-	if (ctx->source == PNGU_SOURCE_BUFFER)
-	{
-		// Installation of our custom data writer function
-		ctx->cursor = 0;
-		png_set_write_fn (ctx->png_ptr, ctx, pngu_write_data_to_buffer, pngu_flush_data_to_buffer);
-	}
-	else if (ctx->source == PNGU_SOURCE_DEVICE)
-	{
-		// Default data writer uses function fwrite, so it needs to use our FILE*
-		png_init_io (ctx->png_ptr, ctx->fd);
-	}
-
-	// Setup output file properties
-    png_set_IHDR (ctx->png_ptr, ctx->info_ptr, width, height, 8, PNG_COLOR_TYPE_RGB, 
-				PNG_INTERLACE_NONE, PNG_COMPRESSION_TYPE_DEFAULT, PNG_FILTER_TYPE_DEFAULT);
-
-	// Allocate memory to store the image in RGB format
-	rowbytes = width * 3;
-	if (rowbytes % 4)
-		rowbytes = ((rowbytes / 4) + 1) * 4; // Add extra padding so each row starts in a 4 byte boundary
-
-	ctx->img_data = malloc (rowbytes * height);
-	if (!ctx->img_data)
-	{
-		png_destroy_write_struct (&(ctx->png_ptr), (png_infopp)NULL);
-		if (ctx->source == PNGU_SOURCE_DEVICE)
-			fclose (ctx->fd);
-		return PNGU_LIB_ERROR;
-	}
-
-	ctx->row_pointers = malloc (sizeof (png_bytep) * height);
-	if (!ctx->row_pointers)
-	{
-		png_destroy_write_struct (&(ctx->png_ptr), (png_infopp)NULL);
-		if (ctx->source == PNGU_SOURCE_DEVICE)
-			fclose (ctx->fd);
-		return PNGU_LIB_ERROR;
-	}
-
-	// Encode YCbYCr image into RGB8 format
-	buffWidth = (width + stride) / 2;
-	for (y = 0; y < height; y++)
-	{
-		ctx->row_pointers[y] = ctx->img_data + (y * rowbytes);
-
-		for (x = 0; x < (width / 2); x++)
-			PNGU_YCbYCr_TO_RGB8 ( ((PNGU_u32 *)buffer)[y*buffWidth+x], 
-				((PNGU_u8 *) ctx->row_pointers[y]+x*6), ((PNGU_u8 *) ctx->row_pointers[y]+x*6+1),
-				((PNGU_u8 *) ctx->row_pointers[y]+x*6+2), ((PNGU_u8 *) ctx->row_pointers[y]+x*6+3),
-				((PNGU_u8 *) ctx->row_pointers[y]+x*6+4), ((PNGU_u8 *) ctx->row_pointers[y]+x*6+5) );
-	}
-
-	// Tell libpng where is our image data
-	png_set_rows (ctx->png_ptr, ctx->info_ptr, ctx->row_pointers);
-
-	// Write file header and image data
-	png_write_png (ctx->png_ptr, ctx->info_ptr, PNG_TRANSFORM_IDENTITY, NULL);
-
-	// Tell libpng we have no more data to write
-	png_write_end (ctx->png_ptr, (png_infop) NULL);
-
-	// Free resources
-	free (ctx->img_data);
-	free (ctx->row_pointers);
-	png_destroy_write_struct (&(ctx->png_ptr), &(ctx->info_ptr));
-	if (ctx->source == PNGU_SOURCE_DEVICE)
-		fclose (ctx->fd);
-
-	// Success
-	return PNGU_OK;
-}
-
-
-// This function is taken from a libogc example
-PNGU_u32 PNGU_RGB8_TO_YCbYCr (PNGU_u8 r1, PNGU_u8 g1, PNGU_u8 b1, PNGU_u8 r2, PNGU_u8 g2, PNGU_u8 b2)
-{
-  int y1, cb1, cr1, y2, cb2, cr2, cb, cr;
-
-  y1 = (299 * r1 + 587 * g1 + 114 * b1) / 1000;
-  cb1 = (-16874 * r1 - 33126 * g1 + 50000 * b1 + 12800000) / 100000;
-  cr1 = (50000 * r1 - 41869 * g1 - 8131 * b1 + 12800000) / 100000;
- 
-  y2 = (299 * r2 + 587 * g2 + 114 * b2) / 1000;
-  cb2 = (-16874 * r2 - 33126 * g2 + 50000 * b2 + 12800000) / 100000;
-  cr2 = (50000 * r2 - 41869 * g2 - 8131 * b2 + 12800000) / 100000;
- 
-  cb = (cb1 + cb2) >> 1;
-  cr = (cr1 + cr2) >> 1;
- 
-  return (PNGU_u32) ((y1 << 24) | (cb << 16) | (y2 << 8) | cr);
-}
-
-
-void PNGU_YCbYCr_TO_RGB8 (PNGU_u32 ycbycr, PNGU_u8 *r1, PNGU_u8 *g1, PNGU_u8 *b1, PNGU_u8 *r2, PNGU_u8 *g2, PNGU_u8 *b2)
-{
-	PNGU_u8 *val = (PNGU_u8 *) &ycbycr;
-	int r, g, b;
-
-	r = 1.371f * (val[3] - 128);
-	g = - 0.698f * (val[3] - 128) - 0.336f * (val[1] - 128);
-	b = 1.732f * (val[1] - 128);
-
-	*r1 = pngu_clamp (val[0] + r, 0, 255);
-	*g1 = pngu_clamp (val[0] + g, 0, 255);
-	*b1 = pngu_clamp (val[0] + b, 0, 255);
-
-	*r2 = pngu_clamp (val[2] + r, 0, 255);
-	*g2 = pngu_clamp (val[2] + g, 0, 255);
-	*b2 = pngu_clamp (val[2] + b, 0, 255);
-}
-
-
-int pngu_info (IMGCTX ctx)
-{
-	png_byte magic[8];
-	png_uint_32 width;
-	png_uint_32 height;
-	png_color_16p background;
-	png_bytep trans;
-	png_color_16p trans_values;
-	int scale, i;
-
-	// Check if there is a file selected and if it is a valid .png
-	if (ctx->source == PNGU_SOURCE_BUFFER)
-		memcpy (magic, ctx->buffer, 8);
-
-	else if (ctx->source == PNGU_SOURCE_DEVICE)
-	{
-		// Open file
-		if (!(ctx->fd = fopen (ctx->filename, "rb")))
-			return PNGU_CANT_OPEN_FILE;
-
-		// Load first 8 bytes into magic buffer
-        if (fread (magic, 1, 8, ctx->fd) != 8)
-		{
-			fclose (ctx->fd);
-			return PNGU_CANT_READ_FILE;
-		}
-	}
-
-	else
-		return PNGU_NO_FILE_SELECTED;;
-
-	if (png_sig_cmp(magic, 0, 8) != 0)
-	{
-		if (ctx->source == PNGU_SOURCE_DEVICE)
-			fclose (ctx->fd);
-		return PNGU_FILE_IS_NOT_PNG;
-	}
-
-	// Allocation of libpng structs
-	ctx->png_ptr = png_create_read_struct (PNG_LIBPNG_VER_STRING, NULL, NULL, NULL);
-    if (!(ctx->png_ptr))
-	{
-		if (ctx->source == PNGU_SOURCE_DEVICE)
-			fclose (ctx->fd);
-        return PNGU_LIB_ERROR;
-	}
-
-    ctx->info_ptr = png_create_info_struct (ctx->png_ptr);
-    if (!(ctx->info_ptr))
-    {
-		if (ctx->source == PNGU_SOURCE_DEVICE)
-			fclose (ctx->fd);
-        png_destroy_read_struct (&(ctx->png_ptr), (png_infopp)NULL, (png_infopp)NULL);
-        return PNGU_LIB_ERROR;
-    }
-
-	if (ctx->source == PNGU_SOURCE_BUFFER)
-	{
-		// Installation of our custom data provider function
-		ctx->cursor = 0;
-		png_set_read_fn (ctx->png_ptr, ctx, pngu_read_data_from_buffer);
-	}
-	else if (ctx->source == PNGU_SOURCE_DEVICE)
-	{
-		// Default data provider uses function fread, so it needs to use our FILE*
-		png_init_io (ctx->png_ptr, ctx->fd);
-		png_set_sig_bytes (ctx->png_ptr, 8); // We have read 8 bytes already to check PNG authenticity
-	}
-
-	// Read png header
-	png_read_info (ctx->png_ptr, ctx->info_ptr);
-
-	// Query image properties if they have not been queried before
-	if (!ctx->propRead)
-	{
-		png_get_IHDR(ctx->png_ptr, ctx->info_ptr, &width, &height,
-					(int *) &(ctx->prop.imgBitDepth), 
-					(int *) &(ctx->prop.imgColorType),
-					NULL, NULL, NULL);
-
-		ctx->prop.imgWidth = width;
-		ctx->prop.imgHeight = height;
-		switch (ctx->prop.imgColorType)
-		{
-			case PNG_COLOR_TYPE_GRAY:
-				ctx->prop.imgColorType = PNGU_COLOR_TYPE_GRAY;
-				break;
-			case PNG_COLOR_TYPE_GRAY_ALPHA:
-				ctx->prop.imgColorType = PNGU_COLOR_TYPE_GRAY_ALPHA;
-				break;
-			case PNG_COLOR_TYPE_PALETTE:
-				ctx->prop.imgColorType = PNGU_COLOR_TYPE_PALETTE;
-				break;
-			case PNG_COLOR_TYPE_RGB:
-				ctx->prop.imgColorType = PNGU_COLOR_TYPE_RGB;
-				break;
-			case PNG_COLOR_TYPE_RGB_ALPHA:
-				ctx->prop.imgColorType = PNGU_COLOR_TYPE_RGB_ALPHA;
-				break;
-			default:
-				ctx->prop.imgColorType = PNGU_COLOR_TYPE_UNKNOWN;
-				break;
-		}
-
-		// Constant used to scale 16 bit values to 8 bit values
-		scale = 1;
-		if (ctx->prop.imgBitDepth == 16)
-			scale = 256;
-
-		// Query background color, if any.
-		ctx->prop.validBckgrnd = 0;
-		if (((ctx->prop.imgColorType == PNGU_COLOR_TYPE_RGB) || (ctx->prop.imgColorType == PNGU_COLOR_TYPE_RGB_ALPHA)) &&
-			(png_get_bKGD (ctx->png_ptr, ctx->info_ptr, &background)))
-		{
-			ctx->prop.validBckgrnd = 1;
-			ctx->prop.bckgrnd.r = background->red / scale;
-			ctx->prop.bckgrnd.g = background->green / scale;
-			ctx->prop.bckgrnd.b = background->blue / scale;
-		}
-		else if (((ctx->prop.imgColorType == PNGU_COLOR_TYPE_GRAY) || (ctx->prop.imgColorType == PNGU_COLOR_TYPE_GRAY_ALPHA)) &&
-			(png_get_bKGD (ctx->png_ptr, ctx->info_ptr, &background)))
-		{
-			ctx->prop.validBckgrnd = 1;
-			ctx->prop.bckgrnd.r = ctx->prop.bckgrnd.g = ctx->prop.bckgrnd.b = background->gray / scale;
-		}
-
-		// Query list of transparent colors, if any.
-		ctx->prop.numTrans = 0;
-		ctx->prop.trans = NULL;
-		if (((ctx->prop.imgColorType == PNGU_COLOR_TYPE_RGB) || (ctx->prop.imgColorType == PNGU_COLOR_TYPE_RGB_ALPHA)) &&
-			(png_get_tRNS (ctx->png_ptr, ctx->info_ptr, &trans, (int *) &(ctx->prop.numTrans), &trans_values)))
-		{
-			if (ctx->prop.numTrans)
-			{
-				ctx->prop.trans = malloc (sizeof (PNGUCOLOR) * ctx->prop.numTrans);
-				if (ctx->prop.trans)
-					for (i = 0; i < ctx->prop.numTrans; i++)
-					{
-						ctx->prop.trans[i].r = trans_values[i].red / scale;
-						ctx->prop.trans[i].g = trans_values[i].green / scale;
-						ctx->prop.trans[i].b = trans_values[i].blue / scale;
-					}
-				else
-					ctx->prop.numTrans = 0;
-			}
-		}
-		else if (((ctx->prop.imgColorType == PNGU_COLOR_TYPE_GRAY) || (ctx->prop.imgColorType == PNGU_COLOR_TYPE_GRAY_ALPHA)) &&
-			(png_get_tRNS (ctx->png_ptr, ctx->info_ptr, &trans, (int *) &(ctx->prop.numTrans), &trans_values)))
-		{
-			if (ctx->prop.numTrans)
-			{
-				ctx->prop.trans = malloc (sizeof (PNGUCOLOR) * ctx->prop.numTrans);
-				if (ctx->prop.trans)
-					for (i = 0; i < ctx->prop.numTrans; i++)
-						ctx->prop.trans[i].r = ctx->prop.trans[i].g = ctx->prop.trans[i].b = 
-						trans_values[i].gray / scale;
-				else
-					ctx->prop.numTrans = 0;
-			}
-		}
-
-		ctx->propRead = 1;
-	}
-
-	// Success
-	ctx->infoRead = 1;
-
-	return PNGU_OK;
-}
-
-
-int pngu_decode (IMGCTX ctx, PNGU_u32 width, PNGU_u32 height, PNGU_u32 stripAlpha)
-{
-	png_uint_32 rowbytes;
-	int i;
-
-	// Read info if it hasn't been read before
-	if (!ctx->infoRead)
-	{
-		i = pngu_info (ctx);
-		if (i != PNGU_OK)
-			return i;
-	}
-
-	// Check if the user has specified the real width and height of the image
-	if ( (ctx->prop.imgWidth != width) || (ctx->prop.imgHeight != height) )
-		return PNGU_INVALID_WIDTH_OR_HEIGHT;
-
-	// Check if color type is supported by PNGU
-	if ( (ctx->prop.imgColorType == PNGU_COLOR_TYPE_PALETTE) || (ctx->prop.imgColorType == PNGU_COLOR_TYPE_UNKNOWN) )
-		return PNGU_UNSUPPORTED_COLOR_TYPE;
-
-	// Scale 16 bit samples to 8 bit
-	if (ctx->prop.imgBitDepth == 16)
-        png_set_strip_16 (ctx->png_ptr);
-
-	// Remove alpha channel if we don't need it
-	if (stripAlpha && ((ctx->prop.imgColorType == PNGU_COLOR_TYPE_RGB_ALPHA) || (ctx->prop.imgColorType == PNGU_COLOR_TYPE_GRAY_ALPHA)))
-        png_set_strip_alpha (ctx->png_ptr);
-
-	// Expand 1, 2 and 4 bit samples to 8 bit
-	if (ctx->prop.imgBitDepth < 8)
-        png_set_packing (ctx->png_ptr);
-
-	// Transform grayscale images to RGB
-	if ( (ctx->prop.imgColorType == PNGU_COLOR_TYPE_GRAY) || (ctx->prop.imgColorType == PNGU_COLOR_TYPE_GRAY_ALPHA) )
-		png_set_gray_to_rgb (ctx->png_ptr);
-
-	// Flush transformations
-	png_read_update_info (ctx->png_ptr, ctx->info_ptr);
-
-	// Allocate memory to store the image
-	rowbytes = png_get_rowbytes (ctx->png_ptr, ctx->info_ptr);
-	if (rowbytes % 4)
-		rowbytes = ((rowbytes / 4) + 1) * 4; // Add extra padding so each row starts in a 4 byte boundary
-
-	ctx->img_data = malloc (rowbytes * ctx->prop.imgHeight);
-	if (!ctx->img_data)
-	{
-		pngu_free_info (ctx);
-		return PNGU_LIB_ERROR;
-	}
-
-	ctx->row_pointers = malloc (sizeof (png_bytep) * ctx->prop.imgHeight);
-	if (!ctx->row_pointers)
-	{
-		free (ctx->img_data);
-		pngu_free_info (ctx);
-		return PNGU_LIB_ERROR;
-	}
-
-	for (i = 0; i < ctx->prop.imgHeight; i++)
-		ctx->row_pointers[i] = ctx->img_data + (i * rowbytes);
-
-	// Transform the image and copy it to our allocated memory
-	png_read_image (ctx->png_ptr, ctx->row_pointers);
-
-	// Free resources
-	pngu_free_info (ctx);
-
-	// Success
-	return PNGU_OK;
-}
-
-
-void pngu_free_info (IMGCTX ctx)
-{
-	if (ctx->infoRead)
-	{
-		if (ctx->source == PNGU_SOURCE_DEVICE)
-			fclose (ctx->fd);
-
-		png_destroy_read_struct (&(ctx->png_ptr), &(ctx->info_ptr), (png_infopp)NULL);
-
-		ctx->infoRead = 0;
-	}
-}
-
-
-// Custom data provider function used for reading from memory buffers.
-void pngu_read_data_from_buffer (png_structp png_ptr, png_bytep data, png_size_t length)
-{
-	IMGCTX ctx = (IMGCTX) png_get_io_ptr (png_ptr);
-	memcpy (data, ctx->buffer + ctx->cursor, length);
-	ctx->cursor += length;
-}
-
-
-// Custom data writer function used for writing to memory buffers.
-void pngu_write_data_to_buffer (png_structp png_ptr, png_bytep data, png_size_t length)
-{
-	IMGCTX ctx = (IMGCTX) png_get_io_ptr (png_ptr);
-	memcpy (ctx->buffer + ctx->cursor, data, length);
-	ctx->cursor += length;
-}
-
-
-// Custom data flusher function used for writing to memory buffers.
-void pngu_flush_data_to_buffer (png_structp png_ptr)
-{
-	// Nothing to do here
-}
-
-
-// Function used in YCbYCr to RGB decoding
-int pngu_clamp (int value, int min, int max)
-{
-	if (value < min)
-		value = min;
-	else if (value > max)
-		value = max;
-
-	return value;
-}
-
diff --git a/source/libpng/pngu/pngu.h b/source/libpng/pngu/pngu.h
deleted file mode 100644
index b5e172b..0000000
--- a/source/libpng/pngu/pngu.h
+++ /dev/null
@@ -1,171 +0,0 @@
-/********************************************************************************************
-
-PNGU Version : 0.2a
-
-Coder : frontier
-
-More info : http://frontier-dev.net
-
-********************************************************************************************/
-#ifndef __PNGU__
-#define __PNGU__
-
-// Return codes
-#define PNGU_OK							0
-#define PNGU_ODD_WIDTH					1
-#define PNGU_ODD_STRIDE					2
-#define PNGU_INVALID_WIDTH_OR_HEIGHT	3
-#define PNGU_FILE_IS_NOT_PNG			4
-#define PNGU_UNSUPPORTED_COLOR_TYPE		5
-#define PNGU_NO_FILE_SELECTED			6
-#define PNGU_CANT_OPEN_FILE				7
-#define PNGU_CANT_READ_FILE				8
-#define PNGU_LIB_ERROR					9
-
-// Color types
-#define PNGU_COLOR_TYPE_GRAY			1
-#define PNGU_COLOR_TYPE_GRAY_ALPHA		2
-#define PNGU_COLOR_TYPE_PALETTE			3
-#define PNGU_COLOR_TYPE_RGB				4
-#define PNGU_COLOR_TYPE_RGB_ALPHA		5
-#define PNGU_COLOR_TYPE_UNKNOWN 		6
-
-
-#ifdef __cplusplus
-	extern "C" {
-#endif
-
-// Types
-typedef unsigned char PNGU_u8;
-typedef unsigned short PNGU_u16;
-typedef unsigned int PNGU_u32;
-typedef unsigned long long PNGU_u64;
-
-typedef struct
-{
-	PNGU_u8 r;
-	PNGU_u8 g;
-	PNGU_u8 b;
-} PNGUCOLOR;
-
-typedef struct
-{
-	PNGU_u32 imgWidth; // In pixels
-	PNGU_u32 imgHeight; // In pixels
-	PNGU_u32 imgBitDepth; // In bitx
-	PNGU_u32 imgColorType; // PNGU_COLOR_TYPE_*
-	PNGU_u32 validBckgrnd; // Non zero if there is a background color
-	PNGUCOLOR bckgrnd; // Backgroun color
-	PNGU_u32 numTrans; // Number of transparent colors
-	PNGUCOLOR *trans; // Transparent colors
-} PNGUPROP;
-
-// Image context, always initialize with SelectImageFrom* and free with ReleaseImageContext
-struct _IMGCTX;
-typedef struct _IMGCTX *IMGCTX; 
-
-
-/****************************************************************************
-*							 Pixel conversion								*
-****************************************************************************/
-
-// Macro to convert RGB8 values to RGB565
-#define PNGU_RGB8_TO_RGB565(r,g,b) ( ((((PNGU_u16) r) & 0xF8U) << 8) | ((((PNGU_u16) g) & 0xFCU) << 3) | (((PNGU_u16) b) >> 3) )
-
-// Macro to convert RGBA8 values to RGB5A3
-#define PNGU_RGB8_TO_RGB5A3(r,g,b,a)	(PNGU_u16) (((a & 0xE0U) == 0xE0U) ? \
-										(0x8000U | ((((PNGU_u16) r) & 0xF8U) << 7) | ((((PNGU_u16) g) & 0xF8U) << 2) | (((PNGU_u16) b) >> 3)) : \
-										(((((PNGU_u16) a) & 0xE0U) << 7) | ((((PNGU_u16) r) & 0xF0U) << 4) | (((PNGU_u16) g) & 0xF0U) | ((((PNGU_u16) b) & 0xF0U) >> 4)))
-
-// Function to convert two RGB8 values to YCbYCr
-PNGU_u32 PNGU_RGB8_TO_YCbYCr (PNGU_u8 r1, PNGU_u8 g1, PNGU_u8 b1, PNGU_u8 r2, PNGU_u8 g2, PNGU_u8 b2);
-
-// Function to convert an YCbYCr to two RGB8 values.
-void PNGU_YCbYCr_TO_RGB8 (PNGU_u32 ycbycr, PNGU_u8 *r1, PNGU_u8 *g1, PNGU_u8 *b1, PNGU_u8 *r2, PNGU_u8 *g2, PNGU_u8 *b2);
-
-
-/****************************************************************************
-*							 Image context handling							*
-****************************************************************************/
-
-// Selects a PNG file, previosly loaded into a buffer, and creates an image context for subsequent procesing.
-IMGCTX PNGU_SelectImageFromBuffer (const void *buffer);
-
-// Selects a PNG file, from any devoptab device, and creates an image context for subsequent procesing.
-IMGCTX PNGU_SelectImageFromDevice (const char *filename);
-
-// Frees resources associated with an image context. Always call this function when you no longer need the IMGCTX.
-void PNGU_ReleaseImageContext (IMGCTX ctx);
-
-
-/****************************************************************************
-*							 Miscelaneous									*
-****************************************************************************/
-
-// Retrieves info from selected PNG file, including image dimensions, color format, background and transparency colors.
-int PNGU_GetImageProperties (IMGCTX ctx, PNGUPROP *fileproperties);
-
-
-/****************************************************************************
-*							 Image conversion								*
-****************************************************************************/
-
-// Expands selected image into an YCbYCr buffer. You need to specify context, image dimensions, 
-// destination address and stride in pixels (stride = buffer width - image width).
-int PNGU_DecodeToYCbYCr (IMGCTX ctx, PNGU_u32 width, PNGU_u32 height, void *buffer, PNGU_u32 stride);
-
-// Macro for decoding an image inside a buffer at given coordinates.
-#define PNGU_DECODE_TO_COORDS_YCbYCr(ctx,coordX,coordY,imgWidth,imgHeight,bufferWidth,bufferHeight,buffer)	\
-																											\
-		PNGU_DecodeToYCbYCr (ctx, imgWidth, imgHeight, ((void *) buffer) + (coordY) * (bufferWidth) * 2 +	\
-							(coordX) * 2, (bufferWidth) - (imgWidth))
-
-// Expands selected image into a linear RGB565 buffer. You need to specify context, image dimensions, 
-// destination address and stride in pixels (stride = buffer width - image width).
-int PNGU_DecodeToRGB565 (IMGCTX ctx, PNGU_u32 width, PNGU_u32 height, void *buffer, PNGU_u32 stride);
-
-// Macro for decoding an image inside a buffer at given coordinates.
-#define PNGU_DECODE_TO_COORDS_RGB565(ctx,coordX,coordY,imgWidth,imgHeight,bufferWidth,bufferHeight,buffer)	\
-																											\
-		PNGU_DecodeToRGB565 (ctx, imgWidth, imgHeight, ((void *) buffer) + (coordY) * (bufferWidth) * 2 +	\
-							(coordX) * 2, (bufferWidth) - (imgWidth))
-
-// Expands selected image into a linear RGBA8 buffer. You need to specify context, image dimensions, 
-// destination address, stride in pixels and default alpha value, which is used if the source image 
-// doesn't have an alpha channel.
-int PNGU_DecodeToRGBA8 (IMGCTX ctx, PNGU_u32 width, PNGU_u32 height, void *buffer, PNGU_u32 stride, PNGU_u8 default_alpha);
-
-// Macro for decoding an image inside a buffer at given coordinates.
-#define PNGU_DECODE_TO_COORDS_RGBA8(ctx,coordX,coordY,imgWidth,imgHeight,default_alpha,bufferWidth,bufferHeight,buffer)	\
-																											\
-		PNGU_DecodeToRGBA8 (ctx, imgWidth, imgHeight, ((void *) buffer) + (coordY) * (bufferWidth) * 2 +	\
-							(coordX) * 2, (bufferWidth) - (imgWidth), default_alpha)
-
-// Expands selected image into a 4x4 tiled RGB565 buffer. You need to specify context, image dimensions
-// and destination address.
-int PNGU_DecodeTo4x4RGB565 (IMGCTX ctx, PNGU_u32 width, PNGU_u32 height, void *buffer);
-
-// Expands selected image into a 4x4 tiled RGB5A3 buffer. You need to specify context, image dimensions,
-// destination address and default alpha value, which is used if the source image doesn't have an alpha channel.
-int PNGU_DecodeTo4x4RGB5A3 (IMGCTX ctx, PNGU_u32 width, PNGU_u32 height, void *buffer, PNGU_u8 default_alpha);
-
-// Expands selected image into a 4x4 tiled RGBA8 buffer. You need to specify context, image dimensions,
-// destination address and default alpha value, which is used if the source image doesn't have an alpha channel.
-int PNGU_DecodeTo4x4RGBA8 (IMGCTX ctx, PNGU_u32 width, PNGU_u32 height, void *buffer, PNGU_u8 default_alpha);
-
-// Encodes an YCbYCr image in PNG format and stores it in the selected device or memory buffer. You need to 
-// specify context, image dimensions, destination address and stride in pixels (stride = buffer width - image width).
-int PNGU_EncodeFromYCbYCr (IMGCTX ctx, PNGU_u32 width, PNGU_u32 height, void *buffer, PNGU_u32 stride);
-
-// Macro for encoding an image stored into an YCbYCr buffer at given coordinates.
-#define PNGU_ENCODE_TO_COORDS_YCbYCr(ctx,coordX,coordY,imgWidth,imgHeight,bufferWidth,bufferHeight,buffer)	\
-																											\
-		PNGU_EncodeFromYCbYCr (ctx, imgWidth, imgHeight, ((void *) buffer) + (coordY) * (bufferWidth) * 2 +	\
-							(coordX) * 2, (bufferWidth) - (imgWidth))
-
-#ifdef __cplusplus
-	}
-#endif
-
-#endif
-