Merge in from trunk r64802 - r68625

[wxWidgets.git] / src / png / png.h

diff --git a/src/png/png.h b/src/png/png.h
index 4314ac7751a410fe5e8efa2b22b3f1e5a348add9..805be120f57d6d7141d6764293fa93ecae52a580 100644 (file)
--- a/src/png/png.h
+++ b/src/png/png.h
@@ -1,125 +1,240 @@
 
 /* png.h - header file for PNG reference library
  *
 
 /* png.h - header file for PNG reference library
  *

- * libpng version 1.0.3 - January 14, 1999
- * Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.
- * Copyright (c) 1996, 1997 Andreas Dilger
- * Copyright (c) 1998, 1999 Glenn Randers-Pehrson
+ * libpng version 1.4.4 - September 23, 2010
+ * Copyright (c) 1998-2010 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.)

  *
  *

- * Y2K compliance in libpng:
- * =========================
+ * This code is released under the libpng license (See LICENSE, below)

  *
  *

- *    January 13, 1999
+ * 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 1.4.4 - September 23, 2010: Glenn
+ *  See also "Contributing Authors", below.

  *
  *

- *    Since the PNG Development group is an ad-hoc body, we can't make
- *    an official declaration.
+ * Note about libpng version numbers:

  *
  *

- *    This is your unofficial assurance that libpng from version 0.81 and
- *    upward are Y2K compliant.  It is my belief that earlier versions were
- *    also Y2K compliant.
+ *    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:

  *
  *

- *    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.
+ *    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  12.so.0.1.0.17rc1
+ *    1.2.7rc1                13    10207  12.so.0.1.2.7rc1
+ *    1.0.17                  10    10017  12.so.0.1.0.17
+ *    1.2.7                   13    10207  12.so.0.1.2.7
+ *    1.2.8beta1-5            13    10208  12.so.0.1.2.8beta1-5
+ *    1.0.18rc1-5             10    10018  12.so.0.1.0.18rc1-5
+ *    1.2.8rc1-5              13    10208  12.so.0.1.2.8rc1-5
+ *    1.0.18                  10    10018  12.so.0.1.0.18
+ *    1.2.8                   13    10208  12.so.0.1.2.8
+ *    1.2.9beta1-3            13    10209  12.so.0.1.2.9beta1-3
+ *    1.2.9beta4-11           13    10209  12.so.0.9[.0]
+ *    1.2.9rc1                13    10209  12.so.0.9[.0]
+ *    1.2.9                   13    10209  12.so.0.9[.0]
+ *    1.2.10beta1-7           13    10210  12.so.0.10[.0]
+ *    1.2.10rc1-2             13    10210  12.so.0.10[.0]
+ *    1.2.10                  13    10210  12.so.0.10[.0]
+ *    1.4.0beta1-5            14    10400  14.so.0.0[.0]
+ *    1.2.11beta1-4           13    10211  12.so.0.11[.0]
+ *    1.4.0beta7-8            14    10400  14.so.0.0[.0]
+ *    1.2.11                  13    10211  12.so.0.11[.0]
+ *    1.2.12                  13    10212  12.so.0.12[.0]
+ *    1.4.0beta9-14           14    10400  14.so.0.0[.0]
+ *    1.2.13                  13    10213  12.so.0.13[.0]
+ *    1.4.0beta15-36          14    10400  14.so.0.0[.0]
+ *    1.4.0beta37-87          14    10400  14.so.14.0[.0]
+ *    1.4.0rc01               14    10400  14.so.14.0[.0]
+ *    1.4.0beta88-109         14    10400  14.so.14.0[.0]
+ *    1.4.0rc02-08            14    10400  14.so.14.0[.0]
+ *    1.4.0                   14    10400  14.so.14.0[.0]
+ *    1.4.1beta01-03          14    10401  14.so.14.1[.0]
+ *    1.4.1rc01               14    10401  14.so.14.1[.0]
+ *    1.4.1beta04-12          14    10401  14.so.14.1[.0]
+ *    1.4.1rc02-04            14    10401  14.so.14.1[.0]
+ *    1.4.1                   14    10401  14.so.14.1[.0]
+ *    1.4.2beta01             14    10402  14.so.14.2[.0]
+ *    1.4.2rc02-06            14    10402  14.so.14.2[.0]
+ *    1.4.2                   14    10402  14.so.14.2[.0]
+ *    1.4.3beta01-05          14    10403  14.so.14.3[.0]
+ *    1.4.3rc01-03            14    10403  14.so.14.3[.0]
+ *    1.4.3                   14    10403  14.so.14.3[.0]
+ *    1.4.4beta01-08          14    10404  14.so.14.4[.0]
+ *    1.4.4rc01-06            14    10404  14.so.14.4[.0]

  *
  *

- *    The integer is
- *        "png_uint_16 year" in png_time_struct.
+ *    Henceforth the source version will match the shared-library major
+ *    and minor numbers; the shared-library major version number will be
+ *    used for changes in backward compatibility, as it is intended.  The
+ *    PNG_LIBPNG_VER macro, which is not used within libpng but is available
+ *    for applications, is an unsigned integer of the form xyyzz corresponding
+ *    to the source version x.y.z (leading zeros in y and z).  Beta versions
+ *    were given the previous public release number plus a letter, until
+ *    version 1.0.6j; from then on they were given the upcoming public
+ *    release number plus "betaNN" or "rcN".

  *
  *

- *    The strings are
- *        "png_charp time_buffer" in png_struct and
- *        "near_time_buffer", which is a local character string in png.c.
+ *    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.

  *
  *

- *    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
+ *    DLLNUM will change each time there are forward or backward changes
+ *    in binary compatibility (e.g., when a new feature is added).

  *
  *

- *    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 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.
+ * 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:

  *
  *

- *    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.
+ * If you modify libpng you may insert additional notices immediately following
+ * this sentence.

  *
  *

+ * This code is released under the libpng license.

  *
  *

- *       Glenn Randers-Pehrson
- *       libpng maintainer
- *       PNG Development Group
+ * libpng versions 1.2.6, August 15, 2004, through 1.4.4, September 23, 2010, are
+ * Copyright (c) 2004, 2006-2010 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:

  *
  *

- * Note about libpng version numbers:
+ *    Cosmin Truta

  *
  *

- *    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:
+ * 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:

  *
  *

- *    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 [int should be 10000]
- *    1.0.0                     1.0.0      100  2.1.0 [int should be 10000]
- *    1.0.1                     1.0.1    10001  2.1.0
- *    1.0.1a-e                  1.0.1a-e 10002  2.1.0.1a-e
- *    1.0.2                     1.0.2    10002  2.1.0.2
- *    1.0.2a-c                  1.0.2a   10003  2.1.0.2a-c
- *    1.0.3                     1.0.3    10003  2.1.0.3
+ *    Simon-Pierre Cadieux
+ *    Eric S. Raymond
+ *    Gilles Vollant

  *
  *

- *    Henceforth the source version will match the shared-library minor
- *    and patch numbers; the shared-library major version number will be
- *    used for changes in backward compatibility, as it is intended.  The
- *    PNG_PNGLIB_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).
+ * and with the following additions to the disclaimer:

  *
  *

- * See libpng.txt or libpng.3 for more information.  The PNG specification
- * is available as RFC 2083 <ftp://ftp.uu.net/graphics/png/documents/>
- * and as a W3C Recommendation <http://www.w3.org/TR/REC.png.html>
+ *    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:

  *
  *

- * Contributing Authors:

  *    John Bowler
  *    Kevin Bracey
  *    Sam Bushell
  *    John Bowler
  *    Kevin Bracey
  *    Sam Bushell

- *    Andreas Dilger

  *    Magnus Holmgren
  *    Magnus Holmgren

- *    Tom Lane
- *    Dave Martindale
- *    Glenn Randers-Pehrson

  *    Greg Roelofs
  *    Greg Roelofs

- *    Guy Eric Schalnat
- *    Paul Schmidt

  *    Tom Tanner
  *    Tom Tanner

- *    Willem van Schaik
- *    Tim Wegner

  *
  *

- * 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.
+ * libpng versions 0.5, May 1995, through 0.88, January 1996, are
+ * Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.

  *
  *

- * Thanks to Frank J. T. Wojcik for helping with the documentation.
+ * For the purposes of this copyright and license, "Contributing Authors"
+ * is defined as the following set of individuals:

  *
  *

- * COPYRIGHT NOTICE:
+ *    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,
  *
  * The PNG Reference Library is supplied "AS IS".  The Contributing Authors
  * and Group 42, Inc. disclaim all warranties, expressed or implied,


@@ -132,11 +247,14 @@
  * 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:
  * 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.
  * 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.
+ *
+ * 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
  *
  * The Contributing Authors and Group 42, Inc. specifically permit, without
  * fee, and encourage the use of this source code as a component to


@@ -145,13 +263,87 @@
  * appreciated.
  */
 
  * 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).
+ */

 
 

-#ifndef _PNG_H
-#define _PNG_H
+/*
+ * Libpng is OSI Certified Open Source Software.  OSI Certified is a
+ * certification mark of the Open Source Initiative.
+ */

 
 

-#ifdef __cplusplus
-extern "C" {
-#endif /* __cplusplus */
+/*
+ * 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:
+ * =========================
+ *
+ *    September 23, 2010
+ *
+ *    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 1.4.4 are Y2K compliant.  It is my belief that earlier
+ *    versions were also Y2K compliant.
+ *
+ *    Libpng only has three year fields.  One is a 2-byte unsigned integer
+ *    that will hold years up to 65535.  The other two hold the date in text
+ *    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
 
 /* 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


@@ -159,46 +351,102 @@ extern "C" {
  * at the actual function definitions and structure components.
  */
 
  * at the actual function definitions and structure components.
  */
 

-/* include the compression library's header */
+/* Version information for png.h - this should match the version in png.c */
+#define PNG_LIBPNG_VER_STRING "1.4.4"
+#define PNG_HEADER_VERSION_STRING \
+   " libpng version 1.4.4 - September 23, 2010\n"
+
+#define PNG_LIBPNG_VER_SONUM   14
+#define PNG_LIBPNG_VER_DLLNUM  14
+
+/* These should match the first 3 components of PNG_LIBPNG_VER_STRING: */
+#define PNG_LIBPNG_VER_MAJOR   1
+#define PNG_LIBPNG_VER_MINOR   4
+#define PNG_LIBPNG_VER_RELEASE 4
+/* This should match the numeric part of the final component of
+ * PNG_LIBPNG_VER_STRING, omitting any leading zero:
+ */
+
+#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_BETA
+
+/* Careful here.  At one time, Guy wanted to use 082, but that would be octal.
+ * We must not include leading zeros.
+ * Versions 0.7 through 1.0.0 were in the range 0 to 100 here (only
+ * version 1.0.0 was mis-numbered 100 instead of 10000).  From
+ * version 1.0.1 it's    xxyyzz, where x=major, y=minor, z=release
+ */
+#define PNG_LIBPNG_VER 10404 /* 1.4.4 */
+
+#ifndef PNG_VERSION_INFO_ONLY
+/* Include the compression library's header */

 #include "zlib.h"
 #include "zlib.h"

+#endif

 
 

-/* include all user configurable info */
+/* Include all user configurable info, including optional assembler routines */

 #include "pngconf.h"
 
 #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.
+ */
+
+#ifdef PNG_USER_PRIVATEBUILD
+#  define PNG_LIBPNG_BUILD_TYPE \
+          (PNG_LIBPNG_BUILD_BASE_TYPE | PNG_LIBPNG_BUILD_PRIVATE)
+#else
+#  ifdef 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.
  */
 
 /* 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.
  */
 

-/* Version information for png.h - this should match the version in png.c */
-#define PNG_LIBPNG_VER_STRING "1.0.3"
-
-/* 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=bugfix */
-#define PNG_LIBPNG_VER    10003  /* 1.0.3 */
-
-/* variables declared in png.c - only it needs to define PNG_NO_EXTERN */
+/* 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.
  */
 #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.
  */

-extern char png_libpng_ver[12];   /* need room for 99.99.99aa */
-
-/* Structures to facilitate easy interlacing.  See png.c for more details */
-extern int FARDATA png_pass_start[7];
-extern int FARDATA png_pass_inc[7];
-extern int FARDATA png_pass_ystart[7];
-extern int FARDATA png_pass_yinc[7];
-extern int FARDATA png_pass_mask[7];
-extern int FARDATA png_pass_dsp_mask[7];
-/* These aren't currently used.  If you need them, see png.c for more details
-extern int FARDATA png_pass_width[7];
-extern int FARDATA png_pass_height[7];
-*/
+#define png_libpng_ver png_get_header_ver(NULL)

 
 #endif /* PNG_NO_EXTERN */
 
 
 #endif /* PNG_NO_EXTERN */
 


@@ -237,17 +485,67 @@ typedef struct png_color_8_struct
 typedef png_color_8 FAR * png_color_8p;
 typedef png_color_8 FAR * FAR * png_color_8pp;
 
 typedef png_color_8 FAR * png_color_8p;
 typedef png_color_8 FAR * FAR * png_color_8pp;
 

-/* png_text holds the text in a PNG file, and whether they are compressed
-   in the PNG file or not.  The "text" field points to a regular C string. */
+/*
+ * 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
 {
 typedef struct png_text_struct
 {

-   int compression;        /* compression value, see PNG_TEXT_COMPRESSION_ */
+   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 key;          /* keyword, 1-79 character description of "text" */

-   png_charp text;         /* comment, may be an empty string (ie "") */
-   png_size_t text_length; /* length of "text" field */
+   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;
 } 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. */
 
 /* Supported compression types for text in PNG files (tEXt, and zTXt).
  * The values of the PNG_TEXT_COMPRESSION_ defines should NOT be changed. */


@@ -255,13 +553,15 @@ typedef png_text FAR * FAR * png_textpp;
 #define PNG_TEXT_COMPRESSION_zTXt_WR -2
 #define PNG_TEXT_COMPRESSION_NONE    -1
 #define PNG_TEXT_COMPRESSION_zTXt     0
 #define PNG_TEXT_COMPRESSION_zTXt_WR -2
 #define PNG_TEXT_COMPRESSION_NONE    -1
 #define PNG_TEXT_COMPRESSION_zTXt     0

-#define PNG_TEXT_COMPRESSION_LAST     1  /* Not a valid value */
+#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
 
 /* 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 is Year 2000 compliant!
+ * note - PNG has always been Year 2000 compliant!

  */
 typedef struct png_time_struct
 {
  */
 typedef struct png_time_struct
 {


@@ -275,6 +575,27 @@ typedef struct png_time_struct
 typedef png_time FAR * png_timep;
 typedef png_time FAR * FAR * png_timepp;
 
 typedef png_time FAR * png_timep;
 typedef png_time FAR * FAR * png_timepp;
 

+#if defined(PNG_UNKNOWN_CHUNKS_SUPPORTED) || \
+ defined(PNG_HANDLE_AS_UNKNOWN_SUPPORTED)
+/* png_unknown_chunk is a structure to hold queued chunks for which there is
+ * no specific support.  The idea is that we can use this to queue
+ * up private chunks for output even though the library doesn't actually
+ * know about their semantics.
+ */
+typedef struct png_unknown_chunk_t
+{
+    png_byte name[5];
+    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
 /* 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


@@ -295,28 +616,60 @@ typedef png_time FAR * FAR * png_timepp;
  * 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.
  * 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 */
  */
 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) */
-   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 */
+   png_uint_32 width PNG_DEPSTRUCT;  /* width of image in pixels (from IHDR) */
+   png_uint_32 height PNG_DEPSTRUCT; /* height of image in pixels (from IHDR) */
+   png_uint_32 valid PNG_DEPSTRUCT;  /* valid chunk data (see PNG_INFO_
+                                        below) */
+   png_size_t rowbytes PNG_DEPSTRUCT; /* bytes needed to hold an untransformed
+                                         row */
+   png_colorp palette PNG_DEPSTRUCT;      /* array of color values
+                                             (valid & PNG_INFO_PLTE) */
+   png_uint_16 num_palette PNG_DEPSTRUCT; /* number of color entries in
+                                             "palette" (PLTE) */
+   png_uint_16 num_trans PNG_DEPSTRUCT;   /* number of transparent palette
+                                             color (tRNS) */
+   png_byte bit_depth PNG_DEPSTRUCT;      /* 1, 2, 4, 8, or 16 bits/channel
+                                             (from IHDR) */
+   png_byte color_type PNG_DEPSTRUCT;     /* see PNG_COLOR_TYPE_ below
+                                             (from IHDR) */
+   /* The following three should have been named *_method not *_type */
+   png_byte compression_type PNG_DEPSTRUCT; /* must be
+                                             PNG_COMPRESSION_TYPE_BASE (IHDR) */
+   png_byte filter_type PNG_DEPSTRUCT;    /* must be PNG_FILTER_TYPE_BASE
+                                             (from IHDR) */
+   png_byte interlace_type PNG_DEPSTRUCT; /* One of PNG_INTERLACE_NONE,
+                                             PNG_INTERLACE_ADAM7 */

 
    /* The following is informational only on read, and not used on writes. */
 
    /* The following is informational only on read, and not used on writes. */

-   png_byte channels;       /* number of data channels per pixel (1, 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 */
+   png_byte channels PNG_DEPSTRUCT;       /* number of data channels per
+                                             pixel (1, 2, 3, 4) */
+   png_byte pixel_depth PNG_DEPSTRUCT;    /* number of bits per pixel */
+   png_byte spare_byte PNG_DEPSTRUCT;     /* to align the data, and for
+                                             future use */
+   png_byte signature[8] PNG_DEPSTRUCT;   /* 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
 
    /* 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


@@ -324,51 +677,55 @@ typedef struct png_info_struct
     * and initialize the appropriate fields below.
     */
 
     * and initialize the appropriate fields below.
     */
 

-#if defined(PNG_READ_gAMA_SUPPORTED) || defined(PNG_WRITE_gAMA_SUPPORTED) || \
-    defined(PNG_READ_GAMMA_SUPPORTED)
+#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.
     */
    /* 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 /* PNG_READ_gAMA_SUPPORTED || PNG_WRITE_gAMA_SUPPORTED */
+   float gamma PNG_DEPSTRUCT; /* gamma value of image,
+                                 if (valid & PNG_INFO_gAMA) */
+#endif

 
 

-#if defined(PNG_READ_sRGB_SUPPORTED) || defined(PNG_WRITE_sRGB_SUPPORTED)
+#ifdef PNG_sRGB_SUPPORTED

     /* GR-P, 0.96a */
     /* Data valid if (valid & PNG_INFO_sRGB) non-zero. */
     /* 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 /* PNG_READ_sRGB_SUPPORTED || PNG_WRITE_sRGB_SUPPORTED */
-
-#if defined(PNG_READ_tEXt_SUPPORTED) || defined(PNG_WRITE_tEXt_SUPPORTED) || \
-    defined(PNG_READ_zTXt_SUPPORTED) || defined(PNG_WRITE_zTXt_SUPPORTED)
-   /* The tEXt and zTXt chunks contain human-readable textual data in
-    * uncompressed and 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.
+   png_byte srgb_intent PNG_DEPSTRUCT; /* sRGB rendering intent
+                                          [0, 1, 2, or 3] */
+#endif
+
+#ifdef 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_READ_OR_WRITE_tEXt_OR_zTXt_SUPPORTED */
-#if defined(PNG_READ_tIME_SUPPORTED) || defined(PNG_WRITE_tIME_SUPPORTED)
+   int num_text PNG_DEPSTRUCT; /* number of comments read/to write */
+   int max_text PNG_DEPSTRUCT; /* current size of text array */
+   png_textp text PNG_DEPSTRUCT; /* array of comments read/to write */
+#endif /* PNG_TEXT_SUPPORTED */
+
+#ifdef 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.
     */
    /* 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 /* PNG_READ_tIME_SUPPORTED || PNG_WRITE_tIME_SUPPORTED */
-#if defined(PNG_READ_sBIT_SUPPORTED) || defined(PNG_WRITE_sBIT_SUPPORTED)
+   png_time mod_time PNG_DEPSTRUCT;
+#endif
+
+#ifdef 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.
     */
    /* 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 /* PNG_READ_sBIT_SUPPORTED || PNG_WRITE_sBIT_SUPPORTED */
-#if defined(PNG_READ_tRNS_SUPPORTED) || defined(PNG_WRITE_tRNS_SUPPORTED) || \
-    defined(PNG_READ_EXPAND_SUPPORTED) || defined(PNG_READ_BACKGROUND_SUPPORTED)
+   png_color_8 sig_bit PNG_DEPSTRUCT; /* 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
    /* 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


@@ -378,88 +735,177 @@ typedef struct png_info_struct
     * single color specified that should be treated as fully transparent.
     * Data is valid if (valid & PNG_INFO_tRNS) is non-zero.
     */
     * 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 /* PNG_READ_tRNS_SUPPORTED || PNG_WRITE_tRNS_SUPPORTED */
-#if defined(PNG_READ_bKGD_SUPPORTED) || defined(PNG_WRITE_bKGD_SUPPORTED) || \
-    defined(PNG_READ_BACKGROUND_SUPPORTED)
+   png_bytep trans_alpha PNG_DEPSTRUCT;    /* alpha values for paletted
+                                              image */
+   png_color_16 trans_color PNG_DEPSTRUCT; /* 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.
     */
    /* 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 /* PNG_READ_bKGD_SUPPORTED || PNG_WRITE_bKGD_SUPPORTED */
-#if defined(PNG_READ_oFFs_SUPPORTED) || defined(PNG_WRITE_oFFs_SUPPORTED)
+   png_color_16 background PNG_DEPSTRUCT;
+#endif
+
+#ifdef 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.
     */
    /* 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_uint_32 x_offset; /* x offset on page */
-   png_uint_32 y_offset; /* y offset on page */
-   png_byte offset_unit_type; /* offset units type */
-#endif /* PNG_READ_oFFs_SUPPORTED || PNG_WRITE_oFFs_SUPPORTED */
-#if defined(PNG_READ_pHYs_SUPPORTED) || defined(PNG_WRITE_pHYs_SUPPORTED)
+   png_int_32 x_offset PNG_DEPSTRUCT; /* x offset on page */
+   png_int_32 y_offset PNG_DEPSTRUCT; /* y offset on page */
+   png_byte offset_unit_type PNG_DEPSTRUCT; /* offset units type */
+#endif
+
+#ifdef 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.
     */
    /* 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 /* PNG_READ_pHYs_SUPPORTED || PNG_WRITE_pHYs_SUPPORTED */
-#if defined(PNG_READ_hIST_SUPPORTED) || defined(PNG_WRITE_hIST_SUPPORTED)
+   png_uint_32 x_pixels_per_unit PNG_DEPSTRUCT; /* horizontal pixel density */
+   png_uint_32 y_pixels_per_unit PNG_DEPSTRUCT; /* vertical pixel density */
+   png_byte phys_unit_type PNG_DEPSTRUCT; /* resolution type (see
+                                             PNG_RESOLUTION_ below) */
+#endif
+
+#ifdef 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.
     */
    /* 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 /* PNG_READ_hIST_SUPPORTED || PNG_WRITE_hIST_SUPPORTED */
-#if defined(PNG_READ_cHRM_SUPPORTED) || defined(PNG_WRITE_cHRM_SUPPORTED)
+   png_uint_16p hist PNG_DEPSTRUCT;
+#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.
     */
    /* 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.
     */

-   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 /* PNG_READ_cHRM_SUPPORTED || PNG_WRITE_cHRM_SUPPORTED */
-#if defined(PNG_READ_pCAL_SUPPORTED) || defined(PNG_WRITE_pCAL_SUPPORTED)
+#ifdef PNG_FLOATING_POINT_SUPPORTED
+   float x_white PNG_DEPSTRUCT;
+   float y_white PNG_DEPSTRUCT;
+   float x_red PNG_DEPSTRUCT;
+   float y_red PNG_DEPSTRUCT;
+   float x_green PNG_DEPSTRUCT;
+   float y_green PNG_DEPSTRUCT;
+   float x_blue PNG_DEPSTRUCT;
+   float y_blue PNG_DEPSTRUCT;
+#endif
+#endif
+
+#ifdef PNG_pCAL_SUPPORTED

    /* The pCAL chunk describes a transformation between the stored pixel
    /* The pCAL chunk describes a transformation between the stored pixel

-    * values and original physcical data values used to create the image.
+    * 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_
     * 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 Scientific Visualization extension
-    * chunks document png-scivis-19970203 for a complete description of the
-    * transformations and how they should be implemented, as well as the
-    * png-extensions document for a description of the ASCII parameter
-    * strings.  Data values are valid if (valid & PNG_INFO_pCAL) non-zero.
+    * 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 PNG_DEPSTRUCT;  /* pCAL chunk description string */
+   png_int_32 pcal_X0 PNG_DEPSTRUCT;      /* minimum value */
+   png_int_32 pcal_X1 PNG_DEPSTRUCT;      /* maximum value */
+   png_charp pcal_units PNG_DEPSTRUCT;    /* Latin-1 string giving physical
+                                             units */
+   png_charpp pcal_params PNG_DEPSTRUCT;  /* ASCII strings containing
+                                             parameter values */
+   png_byte pcal_type PNG_DEPSTRUCT;      /* equation type
+                                             (see PNG_EQUATION_ below) */
+   png_byte pcal_nparams PNG_DEPSTRUCT;   /* number of parameters given
+                                             in pcal_params */
+#endif
+
+/* New members added in libpng-1.0.6 */
+   png_uint_32 free_me PNG_DEPSTRUCT;     /* flags items libpng is
+                                             responsible for freeing */
+
+#if defined(PNG_UNKNOWN_CHUNKS_SUPPORTED) || \
+ defined(PNG_HANDLE_AS_UNKNOWN_SUPPORTED)
+   /* Storage for unknown chunks that the library doesn't recognize. */
+   png_unknown_chunkp unknown_chunks PNG_DEPSTRUCT;
+   png_size_t unknown_chunks_num PNG_DEPSTRUCT;
+#endif
+
+#ifdef PNG_iCCP_SUPPORTED
+   /* iCCP chunk data. */
+   png_charp iccp_name PNG_DEPSTRUCT;     /* profile name */
+   png_charp iccp_profile PNG_DEPSTRUCT;  /* International Color Consortium
+                                             profile data */
+                            /* Note to maintainer: should be png_bytep */
+   png_uint_32 iccp_proflen PNG_DEPSTRUCT;  /* ICC profile data length */
+   png_byte iccp_compression PNG_DEPSTRUCT; /* Always zero */
+#endif
+
+#ifdef PNG_sPLT_SUPPORTED
+   /* Data on sPLT chunks (there may be more than one). */
+   png_sPLT_tp splt_palettes PNG_DEPSTRUCT;
+   png_uint_32 splt_palettes_num PNG_DEPSTRUCT;
+#endif
+
+#ifdef 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_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 /* PNG_READ_pCAL_SUPPORTED || PNG_WRITE_pCAL_SUPPORTED */
+   png_byte scal_unit PNG_DEPSTRUCT;         /* unit of physical scale */
+#ifdef PNG_FLOATING_POINT_SUPPORTED
+   double scal_pixel_width PNG_DEPSTRUCT;    /* width of one pixel */
+   double scal_pixel_height PNG_DEPSTRUCT;   /* height of one pixel */
+#endif
+#ifdef PNG_FIXED_POINT_SUPPORTED
+   png_charp scal_s_width PNG_DEPSTRUCT;     /* string containing height */
+   png_charp scal_s_height PNG_DEPSTRUCT;    /* string containing width */
+#endif
+#endif
+
+#ifdef 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 PNG_DEPSTRUCT;        /* the image bits */
+#endif
+
+#if defined(PNG_FIXED_POINT_SUPPORTED) && defined(PNG_gAMA_SUPPORTED)
+   png_fixed_point int_gamma PNG_DEPSTRUCT; /* 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_DEPSTRUCT;
+   png_fixed_point int_y_white PNG_DEPSTRUCT;
+   png_fixed_point int_x_red PNG_DEPSTRUCT;
+   png_fixed_point int_y_red PNG_DEPSTRUCT;
+   png_fixed_point int_x_green PNG_DEPSTRUCT;
+   png_fixed_point int_y_green PNG_DEPSTRUCT;
+   png_fixed_point int_x_blue PNG_DEPSTRUCT;
+   png_fixed_point int_y_blue PNG_DEPSTRUCT;
+#endif
+

 } png_info;
 } png_info;

+

 typedef png_info FAR * png_infop;
 typedef png_info FAR * FAR * png_infopp;
 
 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))
+

 /* These describe the color_type field in png_info. */
 /* color type masks */
 #define PNG_COLOR_MASK_PALETTE    1
 /* These describe the color_type field in png_info. */
 /* color type masks */
 #define PNG_COLOR_MASK_PALETTE    1


@@ -472,13 +918,17 @@ typedef png_info FAR * FAR * png_infopp;
 #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)
 #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 only defines the single type. */
+/* 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
 
 #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 only defines the single type. */
+/* 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_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_FILTER_TYPE_DEFAULT   PNG_FILTER_TYPE_BASE
 
 /* These are for the interlacing type.  These values should NOT be changed. */


@@ -498,19 +948,29 @@ typedef png_info FAR * FAR * png_infopp;
 #define PNG_EQUATION_HYPERBOLIC   3 /* Hyperbolic sine transformation */
 #define PNG_EQUATION_LAST         4 /* Not a valid value */
 
 #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. */
 /* 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_SATURATION 0
-#define PNG_sRGB_INTENT_PERCEPTUAL 1
-#define PNG_sRGB_INTENT_ABSOLUTE   2
-#define PNG_sRGB_INTENT_RELATIVE   3
+#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 */
 
 #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
 
 /* 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


@@ -529,6 +989,10 @@ typedef png_info FAR * FAR * png_infopp;
 #define PNG_INFO_tIME 0x0200
 #define PNG_INFO_pCAL 0x0400
 #define PNG_INFO_sRGB 0x0800   /* GR-P, 0.96a */
 #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
 
 /* This is used for the transformation routines, as some of them
  * change these values for the row.  It also should enable using


@@ -537,7 +1001,7 @@ typedef png_info FAR * FAR * png_infopp;
 typedef struct png_row_info_struct
 {
    png_uint_32 width; /* width of row */
 typedef struct png_row_info_struct
 {
    png_uint_32 width; /* width of row */

-   png_uint_32 rowbytes; /* number of bytes in row */
+   png_size_t rowbytes; /* number of bytes in row */

    png_byte color_type; /* color type of row */
    png_byte bit_depth; /* bit depth of row */
    png_byte channels; /* number of channels (1, 2, 3, or 4) */
    png_byte 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) */


@@ -556,26 +1020,70 @@ typedef png_row_info FAR * FAR * png_row_infopp;
 typedef struct png_struct_def png_struct;
 typedef png_struct FAR * png_structp;
 
 typedef struct png_struct_def png_struct;
 typedef png_struct FAR * png_structp;
 

-typedef void (*png_error_ptr) PNGARG((png_structp, png_const_charp));
-typedef void (*png_rw_ptr) PNGARG((png_structp, png_bytep, png_size_t));
-typedef void (*png_flush_ptr) PNGARG((png_structp));
-typedef void (*png_read_status_ptr) PNGARG((png_structp, png_uint_32, int));
-typedef void (*png_write_status_ptr) PNGARG((png_structp, png_uint_32, int));
+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
 #ifdef PNG_PROGRESSIVE_READ_SUPPORTED

-typedef void (*png_progressive_info_ptr) PNGARG((png_structp, png_infop));
-typedef void (*png_progressive_end_ptr) PNGARG((png_structp, png_infop));
-typedef void (*png_progressive_row_ptr) PNGARG((png_structp, png_bytep,
+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));
    png_uint_32, int));

-#endif /* PNG_PROGRESSIVE_READ_SUPPORTED */
+#endif

 
 #if defined(PNG_READ_USER_TRANSFORM_SUPPORTED) || \
     defined(PNG_WRITE_USER_TRANSFORM_SUPPORTED)
 
 #if defined(PNG_READ_USER_TRANSFORM_SUPPORTED) || \
     defined(PNG_WRITE_USER_TRANSFORM_SUPPORTED)

-typedef void (*png_user_transform_ptr) PNGARG((png_structp,
+typedef void (PNGAPI *png_user_transform_ptr) PNGARG((png_structp,

     png_row_infop, png_bytep));
     png_row_infop, png_bytep));

-#endif /* PNG_READ|WRITE_USER_TRANSFORM_SUPPORTED */
+#endif

 
 

-typedef png_voidp (*png_malloc_ptr) PNGARG((png_structp, png_size_t));
-typedef void (*png_free_ptr) PNGARG((png_structp, png_structp));
+#ifdef PNG_USER_CHUNKS_SUPPORTED
+typedef int (PNGAPI *png_user_chunk_ptr) PNGARG((png_structp,
+   png_unknown_chunkp));
+#endif
+#ifdef PNG_UNKNOWN_CHUNKS_SUPPORTED
+typedef void (PNGAPI *png_unknown_chunk_ptr) PNGARG((png_structp));
+#endif
+#ifdef PNG_SETJMP_SUPPORTED
+/* This must match the function definition in <setjmp.h>, and the
+ * application must include this before png.h to obtain the definition
+ * of jmp_buf.
+ */
+typedef void (PNGAPI *png_longjmp_ptr) PNGARG((jmp_buf, int));
+#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 */
+/* Added to libpng-1.2.34 */
+#define PNG_TRANSFORM_STRIP_FILLER_BEFORE PNG_TRANSFORM_STRIP_FILLER
+#define PNG_TRANSFORM_STRIP_FILLER_AFTER 0x1000 /* write only */
+/* Added to libpng-1.4.0 */
+#define PNG_TRANSFORM_GRAY_TO_RGB   0x2000      /* read only */
+
+/* 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_alloc_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
 
 /* 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


@@ -586,185 +1094,405 @@ typedef void (*png_free_ptr) PNGARG((png_structp, png_structp));
 
 struct png_struct_def
 {
 
 struct png_struct_def
 {

-   jmp_buf jmpbuf;            /* used in png_error */
+#ifdef PNG_SETJMP_SUPPORTED
+   jmp_buf jmpbuf PNG_DEPSTRUCT;            /* used in png_error */
+   png_longjmp_ptr longjmp_fn PNG_DEPSTRUCT;/* setjmp non-local goto
+                                               function. */
+#endif
+   png_error_ptr error_fn PNG_DEPSTRUCT;    /* function for printing
+                                               errors and aborting */
+   png_error_ptr warning_fn PNG_DEPSTRUCT;  /* function for printing
+                                               warnings */
+   png_voidp error_ptr PNG_DEPSTRUCT;       /* user supplied struct for
+                                               error functions */
+   png_rw_ptr write_data_fn PNG_DEPSTRUCT;  /* function for writing
+                                               output data */
+   png_rw_ptr read_data_fn PNG_DEPSTRUCT;   /* function for reading
+                                               input data */
+   png_voidp io_ptr PNG_DEPSTRUCT;          /* ptr to application struct
+                                               for I/O functions */

 
 

-   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 */
+#ifdef PNG_READ_USER_TRANSFORM_SUPPORTED
+   png_user_transform_ptr read_user_transform_fn PNG_DEPSTRUCT; /* user read
+                                                                 transform */
+#endif
+
+#ifdef PNG_WRITE_USER_TRANSFORM_SUPPORTED
+   png_user_transform_ptr write_user_transform_fn PNG_DEPSTRUCT; /* user write
+                                                                  transform */
+#endif
+
+/* These were added in libpng-1.0.2 */
+#ifdef PNG_USER_TRANSFORM_PTR_SUPPORTED

 #if defined(PNG_READ_USER_TRANSFORM_SUPPORTED) || \
     defined(PNG_WRITE_USER_TRANSFORM_SUPPORTED)
 #if defined(PNG_READ_USER_TRANSFORM_SUPPORTED) || \
     defined(PNG_WRITE_USER_TRANSFORM_SUPPORTED)

-   png_user_transform_ptr read_user_transform_fn; /* user read transform */
-   png_user_transform_ptr write_user_transform_fn; /* user write transform */
-#endif
-   png_voidp io_ptr;          /* ptr to application struct for I/O functions*/
-
-   png_uint_32 mode;          /* tells us where we are in the PNG file */
-   png_uint_32 flags;         /* flags indicating various things to libpng */
-   png_uint_32 transformations; /* which transformations to perform */
-
-   z_stream zstream;          /* pointer to decompression structure (below) */
-   png_bytep zbuf;            /* buffer for zlib */
-   png_size_t zbuf_size;      /* size of zbuf */
-   int zlib_level;            /* holds zlib compression level */
-   int zlib_method;           /* holds zlib compression method */
-   int zlib_window_bits;      /* holds zlib compression window bits */
-   int zlib_mem_level;        /* holds zlib compression memory level */
-   int zlib_strategy;         /* holds zlib compression strategy */
-
-   png_uint_32 width;         /* width of image in pixels */
-   png_uint_32 height;        /* height of image in pixels */
-   png_uint_32 num_rows;      /* number of rows in current pass */
-   png_uint_32 usr_width;     /* width of row at start of write */
-   png_uint_32 rowbytes;      /* size of row in bytes */
-   png_uint_32 irowbytes;     /* size of current interlaced row in bytes */
-   png_uint_32 iwidth;        /* width of current interlaced row in pixels */
-   png_uint_32 row_number;    /* current row in interlace pass */
-   png_bytep prev_row;        /* buffer to save previous (unfiltered) row */
-   png_bytep row_buf;         /* buffer to save current (unfiltered) row */
-   png_bytep sub_row;         /* buffer to save "sub" row when filtering */
-   png_bytep up_row;          /* buffer to save "up" row when filtering */
-   png_bytep avg_row;         /* buffer to save "avg" row when filtering */
-   png_bytep paeth_row;       /* buffer to save "Paeth" row when filtering */
-   png_row_info row_info;     /* used for transformation routines */
-
-   png_uint_32 idat_size;     /* current IDAT size for read */
-   png_uint_32 crc;           /* current chunk CRC value */
-   png_colorp palette;        /* palette from the input file */
-   png_uint_16 num_palette;   /* number of color entries in palette */
-   png_uint_16 num_trans;     /* number of transparency values */
-   png_byte chunk_name[5];    /* null-terminated name of current chunk */
-   png_byte compression;      /* file compression type (always 0) */
-   png_byte filter;           /* file filter type (always 0) */
-   png_byte interlaced;       /* PNG_INTERLACE_NONE, PNG_INTERLACE_ADAM7 */
-   png_byte pass;             /* current interlace pass (0 - 6) */
-   png_byte do_filter;        /* row filter flags (see PNG_FILTER_ below ) */
-   png_byte color_type;       /* color type of file */
-   png_byte bit_depth;        /* bit depth of file */
-   png_byte usr_bit_depth;    /* bit depth of users row */
-   png_byte pixel_depth;      /* number of bits per pixel */
-   png_byte channels;         /* number of channels in file */
-   png_byte usr_channels;     /* channels at start of write */
-   png_byte sig_bytes;        /* magic bytes read/written from start of file */
+   png_voidp user_transform_ptr PNG_DEPSTRUCT; /* user supplied struct
+                                                  for user transform */
+   png_byte user_transform_depth PNG_DEPSTRUCT;    /* bit depth of user
+                                                      transformed pixels */
+   png_byte user_transform_channels PNG_DEPSTRUCT; /* channels in user
+                                                      transformed pixels */
+#endif
+#endif
+
+   png_uint_32 mode PNG_DEPSTRUCT;          /* tells us where we are in
+                                               the PNG file */
+   png_uint_32 flags PNG_DEPSTRUCT;         /* flags indicating various
+                                               things to libpng */
+   png_uint_32 transformations PNG_DEPSTRUCT; /* which transformations
+                                                 to perform */
+
+   z_stream zstream PNG_DEPSTRUCT;          /* pointer to decompression
+                                               structure (below) */
+   png_bytep zbuf PNG_DEPSTRUCT;            /* buffer for zlib */
+   png_size_t zbuf_size PNG_DEPSTRUCT;      /* size of zbuf */
+   int zlib_level PNG_DEPSTRUCT;            /* holds zlib compression level */
+   int zlib_method PNG_DEPSTRUCT;           /* holds zlib compression method */
+   int zlib_window_bits PNG_DEPSTRUCT;      /* holds zlib compression window
+                                               bits */
+   int zlib_mem_level PNG_DEPSTRUCT;        /* holds zlib compression memory
+                                               level */
+   int zlib_strategy PNG_DEPSTRUCT;         /* holds zlib compression
+                                               strategy */
+
+   png_uint_32 width PNG_DEPSTRUCT;         /* width of image in pixels */
+   png_uint_32 height PNG_DEPSTRUCT;        /* height of image in pixels */
+   png_uint_32 num_rows PNG_DEPSTRUCT;      /* number of rows in current pass */
+   png_uint_32 usr_width PNG_DEPSTRUCT;     /* width of row at start of write */
+   png_size_t rowbytes PNG_DEPSTRUCT;       /* size of row in bytes */
+#if 0 /* Replaced with the following in libpng-1.4.1 */
+   png_size_t irowbytes PNG_DEPSTRUCT;
+#endif
+/* Added in libpng-1.4.1 */
+#ifdef PNG_USER_LIMITS_SUPPORTED
+   /* Total memory that a zTXt, sPLT, iTXt, iCCP, or unknown chunk
+    * can occupy when decompressed.  0 means unlimited.
+    * We will change the typedef from png_size_t to png_alloc_size_t
+    * in libpng-1.6.0
+    */
+   png_alloc_size_t user_chunk_malloc_max PNG_DEPSTRUCT;
+#endif
+   png_uint_32 iwidth PNG_DEPSTRUCT;        /* width of current interlaced
+                                               row in pixels */
+   png_uint_32 row_number PNG_DEPSTRUCT;    /* current row in interlace pass */
+   png_bytep prev_row PNG_DEPSTRUCT;        /* buffer to save previous
+                                               (unfiltered) row */
+   png_bytep row_buf PNG_DEPSTRUCT;         /* buffer to save current
+                                               (unfiltered) row */
+   png_bytep sub_row PNG_DEPSTRUCT;         /* buffer to save "sub" row
+                                               when filtering */
+   png_bytep up_row PNG_DEPSTRUCT;          /* buffer to save "up" row
+                                               when filtering */
+   png_bytep avg_row PNG_DEPSTRUCT;         /* buffer to save "avg" row
+                                               when filtering */
+   png_bytep paeth_row PNG_DEPSTRUCT;       /* buffer to save "Paeth" row
+                                               when filtering */
+   png_row_info row_info PNG_DEPSTRUCT;     /* used for transformation
+                                               routines */
+
+   png_uint_32 idat_size PNG_DEPSTRUCT;     /* current IDAT size for read */
+   png_uint_32 crc PNG_DEPSTRUCT;           /* current chunk CRC value */
+   png_colorp palette PNG_DEPSTRUCT;        /* palette from the input file */
+   png_uint_16 num_palette PNG_DEPSTRUCT;   /* number of color entries in
+                                               palette */
+   png_uint_16 num_trans PNG_DEPSTRUCT;     /* number of transparency values */
+   png_byte chunk_name[5] PNG_DEPSTRUCT;    /* null-terminated name of current
+                                               chunk */
+   png_byte compression PNG_DEPSTRUCT;      /* file compression type
+                                               (always 0) */
+   png_byte filter PNG_DEPSTRUCT;           /* file filter type (always 0) */
+   png_byte interlaced PNG_DEPSTRUCT;       /* PNG_INTERLACE_NONE,
+                                               PNG_INTERLACE_ADAM7 */
+   png_byte pass PNG_DEPSTRUCT;             /* current interlace pass (0 - 6) */
+   png_byte do_filter PNG_DEPSTRUCT;        /* row filter flags (see
+                                               PNG_FILTER_ below ) */
+   png_byte color_type PNG_DEPSTRUCT;       /* color type of file */
+   png_byte bit_depth PNG_DEPSTRUCT;        /* bit depth of file */
+   png_byte usr_bit_depth PNG_DEPSTRUCT;    /* bit depth of users row */
+   png_byte pixel_depth PNG_DEPSTRUCT;      /* number of bits per pixel */
+   png_byte channels PNG_DEPSTRUCT;         /* number of channels in file */
+   png_byte usr_channels PNG_DEPSTRUCT;     /* channels at start of write */
+   png_byte sig_bytes PNG_DEPSTRUCT;        /* magic bytes read/written from
+                                               start of file */

 
 #if defined(PNG_READ_FILLER_SUPPORTED) || defined(PNG_WRITE_FILLER_SUPPORTED)
 
 #if defined(PNG_READ_FILLER_SUPPORTED) || defined(PNG_WRITE_FILLER_SUPPORTED)

-   png_uint_16 filler;           /* filler bytes for pixel expansion */
-#endif /* PNG_READ_FILLER_SUPPORTED */
-#if defined(PNG_READ_bKGD_SUPPORTED)
-   png_byte background_gamma_type;
-   float background_gamma;
-   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 /* PNG_READ_GAMMA && PNG_READ_bKGD_SUPPORTED */
-#endif /* PNG_READ_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 /* PNG_WRITE_FLUSH_SUPPORTED */
-#if defined(PNG_READ_GAMMA_SUPPORTED) || defined(PNG_READ_BACKGROUND_SUPPORTED)
-   int gamma_shift;      /* number of "insignificant" bits 16-bit gamma */
-   float gamma;          /* file gamma value */
-   float screen_gamma;   /* screen gamma value (display_gamma/viewing_gamma */
-#endif /* PNG_READ_GAMMA_SUPPORTED */
-#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 /* PNG_READ_GAMMA_SUPPORTED || PNG_WRITE_GAMMA_SUPPORTED */
-#if defined(PNG_READ_GAMMA_SUPPORTED) || defined (PNG_READ_sBIT_SUPPORTED)
-   png_color_8 sig_bit;       /* significant bits in each available channel */
-#endif /* PNG_READ_GAMMA_SUPPORTED || PNG_READ_sBIT_SUPPORTED */
-#if defined(PNG_READ_SHIFT_SUPPORTED) || defined(PNG_WRITE_SHIFT_SUPPORTED)
-   png_color_8 shift;         /* shift for significant bit tranformation */
-#endif /* PNG_READ_SHIFT_SUPPORTED || PNG_WRITE_SHIFT_SUPPORTED */
-#if defined(PNG_READ_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|WRITE_tRNS_SUPPORTED||PNG_READ_EXPAND|BACKGROUND_SUPPORTED */
-   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_READ_tEXt_SUPPORTED) || defined(PNG_READ_zTXt_SUPPORTED)
-   png_size_t current_text_size;     /* current size of text input data */
-   png_size_t current_text_left;     /* how much text left to read in input */
-   png_charp current_text;           /* current text chunk buffer */
-   png_charp current_text_ptr;       /* current location in current_text */
-#endif /* PNG_PROGRESSIVE_READ_SUPPORTED && PNG_READ_tEXt/zTXt_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 /* __TURBOC__&&!_Windows&&!__FLAT__ */
-#if defined(PNG_READ_DITHER_SUPPORTED)
-   png_bytep palette_lookup;         /* lookup table for dithering */
-   png_bytep dither_index;           /* index translation for palette files */
-#endif /* PNG_READ_DITHER_SUPPORTED */
-#if defined(PNG_READ_DITHER_SUPPORTED) || defined(PNG_READ_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 /* PNG_WRITE_WEIGHTED_FILTER_SUPPORTED */
-#if defined(PNG_TIME_RFC1123_SUPPORTED)
-   png_charp time_buffer;            /* String to hold RFC 1123 time text */
-#endif /* PNG_TIME_RFC1123_SUPPORTED */
-#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 /* PNG_USER_MEM_SUPPORTED */
-#if defined(PNG_READ_RGB_TO_GRAY_SUPPORTED)
-   png_byte rgb_to_gray_status;
-   png_byte rgb_to_gray_red_coeff;
-   png_byte rgb_to_gray_green_coeff;
-   png_byte rgb_to_gray_blue_coeff;
+   png_uint_16 filler PNG_DEPSTRUCT;           /* filler bytes for pixel
+                                                  expansion */

 #endif
 #endif

-};

 
 

-typedef png_struct FAR * FAR * png_structpp;
+#ifdef PNG_bKGD_SUPPORTED
+   png_byte background_gamma_type PNG_DEPSTRUCT;
+#  ifdef PNG_FLOATING_POINT_SUPPORTED
+   float background_gamma PNG_DEPSTRUCT;
+#  endif
+   png_color_16 background PNG_DEPSTRUCT;   /* background color in
+                                               screen gamma space */
+#ifdef PNG_READ_GAMMA_SUPPORTED
+   png_color_16 background_1 PNG_DEPSTRUCT; /* background normalized
+                                               to gamma 1.0 */
+#endif
+#endif /* PNG_bKGD_SUPPORTED */

 
 

-/* 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 of the use of each function.
- */
+#ifdef PNG_WRITE_FLUSH_SUPPORTED
+   png_flush_ptr output_flush_fn PNG_DEPSTRUCT; /* Function for flushing
+                                               output */
+   png_uint_32 flush_dist PNG_DEPSTRUCT;    /* how many rows apart to flush,
+                                               0 - no flush */
+   png_uint_32 flush_rows PNG_DEPSTRUCT;    /* number of rows written since
+                                               last flush */
+#endif
+
+#if defined(PNG_READ_GAMMA_SUPPORTED) || defined(PNG_READ_BACKGROUND_SUPPORTED)
+   int gamma_shift PNG_DEPSTRUCT;      /* number of "insignificant" bits
+                                          16-bit gamma */
+#ifdef PNG_FLOATING_POINT_SUPPORTED
+   float gamma PNG_DEPSTRUCT;          /* file gamma value */
+   float screen_gamma PNG_DEPSTRUCT;   /* screen gamma value
+                                          (display_exponent) */
+#endif
+#endif
+
+#if defined(PNG_READ_GAMMA_SUPPORTED) || defined(PNG_READ_BACKGROUND_SUPPORTED)
+   png_bytep gamma_table PNG_DEPSTRUCT;     /* gamma table for 8-bit
+                                               depth files */
+   png_bytep gamma_from_1 PNG_DEPSTRUCT;    /* converts from 1.0 to screen */
+   png_bytep gamma_to_1 PNG_DEPSTRUCT;      /* converts from file to 1.0 */
+   png_uint_16pp gamma_16_table PNG_DEPSTRUCT; /* gamma table for 16-bit
+                                                  depth files */
+   png_uint_16pp gamma_16_from_1 PNG_DEPSTRUCT; /* converts from 1.0 to
+                                                   screen */
+   png_uint_16pp gamma_16_to_1 PNG_DEPSTRUCT; /* converts from file to 1.0 */
+#endif
+
+#if defined(PNG_READ_GAMMA_SUPPORTED) || defined(PNG_sBIT_SUPPORTED)
+   png_color_8 sig_bit PNG_DEPSTRUCT;       /* significant bits in each
+                                               available channel */
+#endif
+
+#if defined(PNG_READ_SHIFT_SUPPORTED) || defined(PNG_WRITE_SHIFT_SUPPORTED)
+   png_color_8 shift PNG_DEPSTRUCT;         /* 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_alpha PNG_DEPSTRUCT;           /* alpha values for
+                                                     paletted files */
+   png_color_16 trans_color PNG_DEPSTRUCT;  /* transparent color for
+                                               non-paletted files */
+#endif
+
+   png_read_status_ptr read_row_fn PNG_DEPSTRUCT;   /* called after each
+                                                       row is decoded */
+   png_write_status_ptr write_row_fn PNG_DEPSTRUCT; /* called after each
+                                                       row is encoded */
+#ifdef PNG_PROGRESSIVE_READ_SUPPORTED
+   png_progressive_info_ptr info_fn PNG_DEPSTRUCT; /* called after header
+                                                      data fully read */
+   png_progressive_row_ptr row_fn PNG_DEPSTRUCT;   /* called after each
+                                                      prog. row is decoded */
+   png_progressive_end_ptr end_fn PNG_DEPSTRUCT;   /* called after image
+                                                      is complete */
+   png_bytep save_buffer_ptr PNG_DEPSTRUCT;        /* current location in
+                                                      save_buffer */
+   png_bytep save_buffer PNG_DEPSTRUCT;            /* buffer for previously
+                                                      read data */
+   png_bytep current_buffer_ptr PNG_DEPSTRUCT;     /* current location in
+                                                      current_buffer */
+   png_bytep current_buffer PNG_DEPSTRUCT;         /* buffer for recently
+                                                      used data */
+   png_uint_32 push_length PNG_DEPSTRUCT;          /* size of current input
+                                                      chunk */
+   png_uint_32 skip_length PNG_DEPSTRUCT;          /* bytes to skip in
+                                                      input data */
+   png_size_t save_buffer_size PNG_DEPSTRUCT;      /* amount of data now
+                                                      in save_buffer */
+   png_size_t save_buffer_max PNG_DEPSTRUCT;       /* total size of
+                                                      save_buffer */
+   png_size_t buffer_size PNG_DEPSTRUCT;           /* total amount of
+                                                      available input data */
+   png_size_t current_buffer_size PNG_DEPSTRUCT;   /* amount of data now
+                                                      in current_buffer */
+   int process_mode PNG_DEPSTRUCT;                 /* what push library
+                                                      is currently doing */
+   int cur_palette PNG_DEPSTRUCT;                  /* current push library
+                                                      palette index */
+
+#  ifdef PNG_TEXT_SUPPORTED
+     png_size_t current_text_size PNG_DEPSTRUCT;   /* current size of
+                                                      text input data */
+     png_size_t current_text_left PNG_DEPSTRUCT;   /* how much text left
+                                                      to read in input */
+     png_charp current_text PNG_DEPSTRUCT;         /* current text chunk
+                                                      buffer */
+     png_charp current_text_ptr PNG_DEPSTRUCT;     /* current location
+                                                      in current_text */
+#  endif /* PNG_PROGRESSIVE_READ_SUPPORTED && PNG_TEXT_SUPPORTED */
+
+#endif /* PNG_PROGRESSIVE_READ_SUPPORTED */
+
+#if defined(__TURBOC__) && !defined(_Windows) && !defined(__FLAT__)
+/* For the Borland special 64K segment handler */
+   png_bytepp offset_table_ptr PNG_DEPSTRUCT;
+   png_bytep offset_table PNG_DEPSTRUCT;
+   png_uint_16 offset_table_number PNG_DEPSTRUCT;
+   png_uint_16 offset_table_count PNG_DEPSTRUCT;
+   png_uint_16 offset_table_count_free PNG_DEPSTRUCT;
+#endif
+
+#ifdef PNG_READ_QUANTIZE_SUPPORTED
+   png_bytep palette_lookup PNG_DEPSTRUCT; /* lookup table for quantizing */
+   png_bytep quantize_index PNG_DEPSTRUCT; /* index translation for palette
+                                              files */
+#endif
+
+#if defined(PNG_READ_QUANTIZE_SUPPORTED) || defined(PNG_hIST_SUPPORTED)
+   png_uint_16p hist PNG_DEPSTRUCT;                /* histogram */
+#endif
+
+#ifdef PNG_WRITE_WEIGHTED_FILTER_SUPPORTED
+   png_byte heuristic_method PNG_DEPSTRUCT;        /* heuristic for row
+                                                      filter selection */
+   png_byte num_prev_filters PNG_DEPSTRUCT;        /* number of weights
+                                                      for previous rows */
+   png_bytep prev_filters PNG_DEPSTRUCT;           /* filter type(s) of
+                                                      previous row(s) */
+   png_uint_16p filter_weights PNG_DEPSTRUCT;      /* weight(s) for previous
+                                                      line(s) */
+   png_uint_16p inv_filter_weights PNG_DEPSTRUCT;  /* 1/weight(s) for
+                                                      previous line(s) */
+   png_uint_16p filter_costs PNG_DEPSTRUCT;        /* relative filter
+                                                      calculation cost */
+   png_uint_16p inv_filter_costs PNG_DEPSTRUCT;    /* 1/relative filter
+                                                      calculation cost */
+#endif
+
+#ifdef PNG_TIME_RFC1123_SUPPORTED
+   png_charp time_buffer PNG_DEPSTRUCT; /* String to hold RFC 1123 time text */
+#endif
+
+/* New members added in libpng-1.0.6 */
+
+   png_uint_32 free_me PNG_DEPSTRUCT;    /* flags items libpng is
+                                            responsible for freeing */
+
+#ifdef PNG_USER_CHUNKS_SUPPORTED
+   png_voidp user_chunk_ptr PNG_DEPSTRUCT;
+   png_user_chunk_ptr read_user_chunk_fn PNG_DEPSTRUCT; /* user read
+                                                           chunk handler */
+#endif
+
+#ifdef PNG_HANDLE_AS_UNKNOWN_SUPPORTED
+   int num_chunk_list PNG_DEPSTRUCT;
+   png_bytep chunk_list PNG_DEPSTRUCT;
+#endif
+
+/* New members added in libpng-1.0.3 */
+#ifdef PNG_READ_RGB_TO_GRAY_SUPPORTED
+   png_byte rgb_to_gray_status PNG_DEPSTRUCT;
+   /* These were changed from png_byte in libpng-1.0.6 */
+   png_uint_16 rgb_to_gray_red_coeff PNG_DEPSTRUCT;
+   png_uint_16 rgb_to_gray_green_coeff PNG_DEPSTRUCT;
+   png_uint_16 rgb_to_gray_blue_coeff PNG_DEPSTRUCT;
+#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 */
+   png_uint_32 mng_features_permitted PNG_DEPSTRUCT;
+#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 PNG_DEPSTRUCT;
+#endif
+
+/* New member added in libpng-1.0.9, ifdef'ed out in 1.0.12, enabled in 1.2.0 */
+#ifdef PNG_MNG_FEATURES_SUPPORTED
+   png_byte filter_type PNG_DEPSTRUCT;
+#endif
+
+/* New members added in libpng-1.2.0 */
+
+/* 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 PNG_DEPSTRUCT;             /* user supplied struct for
+                                                   mem functions */
+   png_malloc_ptr malloc_fn PNG_DEPSTRUCT;      /* function for
+                                                   allocating memory */
+   png_free_ptr free_fn PNG_DEPSTRUCT;          /* function for
+                                                   freeing memory */
+#endif
+
+/* New member added in libpng-1.0.13 and 1.2.0 */
+   png_bytep big_row_buf PNG_DEPSTRUCT;         /* buffer to save current
+                                                   (unfiltered) row */
+
+#ifdef PNG_READ_QUANTIZE_SUPPORTED
+/* The following three members were added at version 1.0.14 and 1.2.4 */
+   png_bytep quantize_sort PNG_DEPSTRUCT;          /* working sort array */
+   png_bytep index_to_palette PNG_DEPSTRUCT;       /* where the original
+                                                     index currently is
+                                                     in the palette */
+   png_bytep palette_to_index PNG_DEPSTRUCT;       /* 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 PNG_DEPSTRUCT;
+
+#ifdef PNG_USER_LIMITS_SUPPORTED
+   png_uint_32 user_width_max PNG_DEPSTRUCT;
+   png_uint_32 user_height_max PNG_DEPSTRUCT;
+   /* Added in libpng-1.4.0: Total number of sPLT, text, and unknown
+    * chunks that can be stored (0 means unlimited).
+    */
+   png_uint_32 user_chunk_cache_max PNG_DEPSTRUCT;
+#endif
+
+/* New member added in libpng-1.0.25 and 1.2.17 */
+#ifdef PNG_UNKNOWN_CHUNKS_SUPPORTED
+   /* Storage for unknown chunk that the library doesn't recognize. */
+   png_unknown_chunk unknown_chunk PNG_DEPSTRUCT;
+#endif
+
+/* New members added in libpng-1.2.26 */
+  png_uint_32 old_big_row_buf_size PNG_DEPSTRUCT;
+  png_uint_32 old_prev_row_size PNG_DEPSTRUCT;
+
+/* New member added in libpng-1.2.30 */
+  png_charp chunkdata PNG_DEPSTRUCT;  /* buffer for reading chunk data */
+
+#ifdef PNG_IO_STATE_SUPPORTED
+/* New member added in libpng-1.4.0 */
+   png_uint_32 io_state PNG_DEPSTRUCT;
+#endif
+};
+
+
+/* This triggers a compiler error in png.c, if png.c and png.h
+ * do not agree upon the version number.
+ */
+typedef png_structp version_1_4_4;
+
+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 */
+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.
  */
 
 /* 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,
+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
    int num_bytes));
 
 /* Check sig[start] through sig[start + num_to_check - 1] to see if it's a


@@ -772,263 +1500,320 @@ extern PNG_EXPORT(void,png_set_sig_bytes) PNGARG((png_structp png_ptr,
  * signature, and non-zero otherwise.  Having num_to_check == 0 or
  * start > 7 will always fail (ie return non-zero).
  */
  * 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_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).
  */
    png_size_t num_to_check));
 
 /* Simple signature checking function.  This is the same as calling
  * png_check_sig(sig, n) := !png_sig_cmp(sig, 0, n).
  */

-extern PNG_EXPORT(int,png_check_sig) PNGARG((png_bytep sig, int num));
+#define png_check_sig(sig,n) !png_sig_cmp((sig), 0, (n))

 
 /* Allocate and initialize png_ptr struct for reading, and any other memory. */
 
 /* Allocate and initialize png_ptr struct for reading, and any other memory. */

-extern PNG_EXPORT(png_structp,png_create_read_struct)
+PNG_EXPORT(png_structp,png_create_read_struct)

    PNGARG((png_const_charp user_png_ver, png_voidp error_ptr,
    PNGARG((png_const_charp user_png_ver, png_voidp error_ptr,

-   png_error_ptr error_fn, png_error_ptr warn_fn));
+   png_error_ptr error_fn, png_error_ptr warn_fn)) PNG_ALLOCATED;

 
 /* Allocate and initialize png_ptr struct for writing, and any other memory */
 
 /* Allocate and initialize png_ptr struct for writing, and any other memory */

-extern PNG_EXPORT(png_structp,png_create_write_struct)
+PNG_EXPORT(png_structp,png_create_write_struct)

    PNGARG((png_const_charp user_png_ver, png_voidp error_ptr,
    PNGARG((png_const_charp user_png_ver, png_voidp error_ptr,

-   png_error_ptr error_fn, png_error_ptr warn_fn));
+   png_error_ptr error_fn, png_error_ptr warn_fn)) PNG_ALLOCATED;
+
+PNG_EXPORT(png_size_t,png_get_compression_buffer_size)
+   PNGARG((png_structp png_ptr));
+
+PNG_EXPORT(void,png_set_compression_buffer_size)
+   PNGARG((png_structp png_ptr, png_size_t size));

 
 

+/* Moved from pngconf.h in 1.4.0 and modified to ensure setjmp/longjmp
+ * match up.
+ */
+#ifdef PNG_SETJMP_SUPPORTED
+/* This function returns the jmp_buf built in to *png_ptr.  It must be
+ * supplied with an appropriate 'longjmp' function to use on that jmp_buf
+ * unless the default error function is overridden in which case NULL is
+ * acceptable.  The size of the jmp_buf is checked against the actual size
+ * allocated by the library - the call will return NULL on a mismatch
+ * indicating an ABI mismatch.
+ */
+PNG_EXPORT(jmp_buf*, png_set_longjmp_fn)
+   PNGARG((png_structp png_ptr, png_longjmp_ptr longjmp_fn, size_t
+       jmp_buf_size));
+#  define png_jmpbuf(png_ptr) \
+   (*png_set_longjmp_fn((png_ptr), longjmp, sizeof (jmp_buf)))
+#else
+#  define png_jmpbuf(png_ptr) \
+   (LIBPNG_WAS_COMPILED_WITH__PNG_NO_SETJMP)
+#endif
+
+#ifdef PNG_READ_SUPPORTED
+/* Reset the compression stream */
+PNG_EXPORT(int,png_reset_zstream) PNGARG((png_structp png_ptr));
+#endif
+
+/* New functions added in libpng-1.0.2 (not enabled by default until 1.2.0) */

 #ifdef PNG_USER_MEM_SUPPORTED
 #ifdef PNG_USER_MEM_SUPPORTED

-extern PNG_EXPORT(png_structp,png_create_read_struct_2)
+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,
    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)
+   png_malloc_ptr malloc_fn, png_free_ptr free_fn)) PNG_ALLOCATED;
+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,
    PNGARG((png_const_charp user_png_ver, png_voidp error_ptr,
    png_error_ptr error_fn, png_error_ptr warn_fn, png_voidp mem_ptr,

-   png_malloc_ptr malloc_fn, png_free_ptr free_fn));
+   png_malloc_ptr malloc_fn, png_free_ptr free_fn)) PNG_ALLOCATED;

 #endif
 
 #endif
 

+/* Write the PNG file signature. */
+PNG_EXPORT(void,png_write_sig) PNGARG((png_structp png_ptr));
+

 /* Write a PNG chunk - size, type, (optional) data, CRC. */
 /* Write a PNG chunk - size, type, (optional) data, CRC. */

-extern PNG_EXPORT(void,png_write_chunk) PNGARG((png_structp png_ptr,
+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. */
    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_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(). */
    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_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). */
    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));
+PNG_EXPORT(void,png_write_chunk_end) PNGARG((png_structp png_ptr));

 
 /* Allocate and initialize the info structure */
 
 /* Allocate and initialize the info structure */

-extern PNG_EXPORT(png_infop,png_create_info_struct)
-   PNGARG((png_structp png_ptr));
+PNG_EXPORT(png_infop,png_create_info_struct)
+   PNGARG((png_structp png_ptr)) PNG_ALLOCATED;

 
 

-/* Initialize the info structure (old interface - NOT DLL EXPORTED) */
-extern void png_info_init PNGARG((png_infop info_ptr));
+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. */
 
 /* Writes all the PNG information before the image. */

-extern PNG_EXPORT(void,png_write_info) PNGARG((png_structp png_ptr,
+PNG_EXPORT(void,png_write_info_before_PLTE) PNGARG((png_structp png_ptr,
+   png_infop info_ptr));
+PNG_EXPORT(void,png_write_info) PNGARG((png_structp png_ptr,

    png_infop info_ptr));
 
    png_infop info_ptr));
 

-/* read the information before the actual image data. */
-extern PNG_EXPORT(void,png_read_info) PNGARG((png_structp png_ptr,
+#ifdef PNG_SEQUENTIAL_READ_SUPPORTED
+/* Read the information before the actual image data. */
+PNG_EXPORT(void,png_read_info) PNGARG((png_structp png_ptr,

    png_infop info_ptr));
    png_infop info_ptr));

+#endif

 
 

-#if defined(PNG_TIME_RFC1123_SUPPORTED)
-extern PNG_EXPORT(png_charp,png_convert_to_rfc1123)
+#ifdef PNG_TIME_RFC1123_SUPPORTED
+PNG_EXPORT(png_charp,png_convert_to_rfc1123)

    PNGARG((png_structp png_ptr, png_timep ptime));
    PNGARG((png_structp png_ptr, png_timep ptime));

-#endif /* PNG_TIME_RFC1123_SUPPORTED */
+#endif

 
 

-#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,
+#ifdef PNG_CONVERT_tIME_SUPPORTED
+/* Convert from a struct tm to png_time */
+PNG_EXPORT(void,png_convert_from_struct_tm) PNGARG((png_timep ptime,

    struct tm FAR * ttime));
 
    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,
+/* Convert from time_t to png_time.  Uses gmtime() */
+PNG_EXPORT(void,png_convert_from_time_t) PNGARG((png_timep ptime,

    time_t ttime));
    time_t ttime));

-#endif /* PNG_WRITE_tIME_SUPPORTED */
+#endif /* PNG_CONVERT_tIME_SUPPORTED */

 
 

-#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));
-#endif /* PNG_READ_EXPAND_SUPPORTED */
+#ifdef PNG_READ_EXPAND_SUPPORTED
+/* Expand data to 24-bit RGB, or 8-bit grayscale, with alpha if available. */
+PNG_EXPORT(void,png_set_expand) PNGARG((png_structp png_ptr));
+PNG_EXPORT(void,png_set_expand_gray_1_2_4_to_8) PNGARG((png_structp
+  png_ptr));
+PNG_EXPORT(void,png_set_palette_to_rgb) PNGARG((png_structp png_ptr));
+PNG_EXPORT(void,png_set_tRNS_to_alpha) PNGARG((png_structp png_ptr));
+#endif

 
 #if defined(PNG_READ_BGR_SUPPORTED) || defined(PNG_WRITE_BGR_SUPPORTED)
 /* Use blue, green, red order for pixels. */
 
 #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 /* PNG_READ_BGR_SUPPORTED || PNG_WRITE_BGR_SUPPORTED */
+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 /* PNG_READ_GRAY_TO_RGB_SUPPORTED */
+#ifdef PNG_READ_GRAY_TO_RGB_SUPPORTED
+/* Expand the grayscale to 24-bit RGB if necessary. */
+PNG_EXPORT(void,png_set_gray_to_rgb) PNGARG((png_structp png_ptr));
+#endif

 
 

-#if defined(PNG_READ_RGB_TO_GRAY_SUPPORTED)
+#ifdef PNG_READ_RGB_TO_GRAY_SUPPORTED

 /* Reduce RGB to grayscale. */
 /* Reduce RGB to grayscale. */

-extern PNG_EXPORT(void,png_set_rgb_to_gray) PNGARG((png_structp png_ptr,
-   int error_action, float red, float green ));
-extern PNG_EXPORT(png_byte,png_get_rgb_to_gray_status) PNGARG((png_structp
+#ifdef PNG_FLOATING_POINT_SUPPORTED
+PNG_EXPORT(void,png_set_rgb_to_gray) PNGARG((png_structp png_ptr,
+   int error_action, double red, double green ));
+#endif
+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 ));
+PNG_EXPORT(png_byte,png_get_rgb_to_gray_status) PNGARG((png_structp

    png_ptr));
    png_ptr));

-#endif /* PNG_READ_RGB_TO_GRAY_SUPPORTED */
+#endif

 
 

-extern PNG_EXPORT(void,png_build_grayscale_palette) PNGARG((int bit_depth,
+PNG_EXPORT(void,png_build_grayscale_palette) PNGARG((int bit_depth,

    png_colorp palette));
 
    png_colorp palette));
 

-#if defined(PNG_READ_STRIP_ALPHA_SUPPORTED)
-extern PNG_EXPORT(void,png_set_strip_alpha) PNGARG((png_structp png_ptr));
-#endif /* PNG_READ_STRIP_ALPHA_SUPPORTED */
+#ifdef PNG_READ_STRIP_ALPHA_SUPPORTED
+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)
 
 #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 /* PNG_READ_SWAP_ALPHA_SUPPORTED || PNG_WRITE_SWAP_ALPHA_SUPPORTED */
+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)
 
 #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 /* PNG_READ_INVERT_ALPHA_SUPPORTED || PNG_WRITE_INVERT_ALPHA_SUPPORTED */
+PNG_EXPORT(void,png_set_invert_alpha) PNGARG((png_structp png_ptr));
+#endif

 
 #if defined(PNG_READ_FILLER_SUPPORTED) || defined(PNG_WRITE_FILLER_SUPPORTED)
 
 #if defined(PNG_READ_FILLER_SUPPORTED) || defined(PNG_WRITE_FILLER_SUPPORTED)

-/* Add a filler byte to 24-bit RGB images. */
-extern PNG_EXPORT(void,png_set_filler) PNGARG((png_structp png_ptr,
+/* Add a filler byte to 8-bit Gray or 24-bit RGB images. */
+PNG_EXPORT(void,png_set_filler) PNGARG((png_structp png_ptr,

    png_uint_32 filler, int flags));
    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
 /* 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. */
+PNG_EXPORT(void,png_set_add_alpha) PNGARG((png_structp png_ptr,
+   png_uint_32 filler, int flags));

 #endif /* PNG_READ_FILLER_SUPPORTED || PNG_WRITE_FILLER_SUPPORTED */
 
 #if defined(PNG_READ_SWAP_SUPPORTED) || defined(PNG_WRITE_SWAP_SUPPORTED)
 #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 /* PNG_READ_SWAP_SUPPORTED || PNG_WRITE_SWAP_SUPPORTED */
+/* Swap bytes in 16-bit depth files. */
+PNG_EXPORT(void,png_set_swap) PNGARG((png_structp png_ptr));
+#endif

 
 #if defined(PNG_READ_PACK_SUPPORTED) || defined(PNG_WRITE_PACK_SUPPORTED)
 
 #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 /* PNG_READ_PACK_SUPPORTED || PNG_WRITE_PACK_SUPPORTED */
+/* Use 1 byte per pixel in 1, 2, or 4-bit depth files. */
+PNG_EXPORT(void,png_set_packing) PNGARG((png_structp png_ptr));
+#endif

 
 

-#if defined(PNG_READ_PACKSWAP_SUPPORTED) || defined(PNG_WRITE_PACKSWAP_SUPPORTED)
+#if defined(PNG_READ_PACKSWAP_SUPPORTED) || \
+    defined(PNG_WRITE_PACKSWAP_SUPPORTED)

 /* Swap packing order of pixels in bytes. */
 /* Swap packing order of pixels in bytes. */

-extern PNG_EXPORT(void,png_set_packswap) PNGARG((png_structp png_ptr));
-#endif /* PNG_READ_PACKSWAP_SUPPORTED || PNG_WRITE_PACKSWAP_SUPPOR */
+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. */
 
 #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_EXPORT(void,png_set_shift) PNGARG((png_structp png_ptr,

    png_color_8p true_bits));
    png_color_8p true_bits));

-#endif /* PNG_READ_SHIFT_SUPPORTED || PNG_WRITE_SHIFT_SUPPORTED */
+#endif

 
 #if defined(PNG_READ_INTERLACING_SUPPORTED) || \
     defined(PNG_WRITE_INTERLACING_SUPPORTED)
 /* Have the code handle the interlacing.  Returns the number of passes. */
 
 #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 /* PNG_READ_INTERLACING_SUPPORTED || PNG_WRITE_INTERLACING_SUPPORTED */
+PNG_EXPORT(int,png_set_interlace_handling) PNGARG((png_structp png_ptr));
+#endif

 
 #if defined(PNG_READ_INVERT_SUPPORTED) || defined(PNG_WRITE_INVERT_SUPPORTED)
 
 #if defined(PNG_READ_INVERT_SUPPORTED) || defined(PNG_WRITE_INVERT_SUPPORTED)

-/* Invert monocrome files */
-extern PNG_EXPORT(void,png_set_invert_mono) PNGARG((png_structp png_ptr));
-#endif /* PNG_READ_INVERT_SUPPORTED || PNG_WRITE_INVERT_SUPPORTED */
+/* Invert monochrome files */
+PNG_EXPORT(void,png_set_invert_mono) PNGARG((png_structp png_ptr));
+#endif

 
 

-#if defined(PNG_READ_BACKGROUND_SUPPORTED)
+#ifdef PNG_READ_BACKGROUND_SUPPORTED

 /* Handle alpha and tRNS by replacing with a background color. */
 /* Handle alpha and tRNS by replacing with a background color. */

-extern PNG_EXPORT(void,png_set_background) PNGARG((png_structp png_ptr,
+#ifdef PNG_FLOATING_POINT_SUPPORTED
+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));
    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
 #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 /* PNG_READ_BACKGROUND_SUPPORTED */
+#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 /* PNG_READ_16_TO_8_SUPPORTED */
+#ifdef PNG_READ_16_TO_8_SUPPORTED
+/* Strip the second byte of information from a 16-bit depth file. */
+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,
+#ifdef PNG_READ_QUANTIZE_SUPPORTED
+/* Turn on quantizing, and reduce the palette to the number of colors
+ * available.  Prior to libpng-1.4.2, this was png_set_dither().
+ */
+PNG_EXPORT(void,png_set_quantize) PNGARG((png_structp png_ptr,

    png_colorp palette, int num_palette, int maximum_colors,
    png_colorp palette, int num_palette, int maximum_colors,

-   png_uint_16p histogram, int full_dither));
-#endif /* PNG_READ_DITHER_SUPPORTED */
+   png_uint_16p histogram, int full_quantize));
+#endif
+/* This migration aid will be removed from libpng-1.5.0 */
+#define png_set_dither png_set_quantize

 
 

-#if defined(PNG_READ_GAMMA_SUPPORTED)
-/* Handle gamma correction. Screen_gamma=(display_gamma/viewing_gamma) */
-extern PNG_EXPORT(void,png_set_gamma) PNGARG((png_structp png_ptr,
+#ifdef PNG_READ_GAMMA_SUPPORTED
+/* Handle gamma correction. Screen_gamma=(display_exponent) */
+#ifdef PNG_FLOATING_POINT_SUPPORTED
+PNG_EXPORT(void,png_set_gamma) PNGARG((png_structp png_ptr,

    double screen_gamma, double default_file_gamma));
    double screen_gamma, double default_file_gamma));

-#endif /* PNG_READ_GAMMA_SUPPORTED */
+#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));

 
 

+#ifdef PNG_WRITE_FLUSH_SUPPORTED
+/* Set how many lines between output flushes - 0 for no flushing */
+PNG_EXPORT(void,png_set_flush) PNGARG((png_structp png_ptr, int nrows));

 /* Flush the current PNG output buffer */
 /* Flush the current PNG output buffer */

-extern PNG_EXPORT(void,png_write_flush) PNGARG((png_structp png_ptr));
-#endif /* PNG_WRITE_FLUSH_SUPPORTED */
+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 update palette with requested transformations */
+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,
+/* Optional call to update the users info structure */
+PNG_EXPORT(void,png_read_update_info) PNGARG((png_structp png_ptr,

    png_infop info_ptr));
 
    png_infop info_ptr));
 

-/* read a one or more rows of image data.*/
-extern PNG_EXPORT(void,png_read_rows) PNGARG((png_structp png_ptr,
+#ifdef PNG_SEQUENTIAL_READ_SUPPORTED
+/* Read one or more rows of image data. */
+PNG_EXPORT(void,png_read_rows) PNGARG((png_structp png_ptr,

    png_bytepp row, png_bytepp display_row, png_uint_32 num_rows));
    png_bytepp row, png_bytepp display_row, png_uint_32 num_rows));

+#endif

 
 

-/* read a row of data.*/
-extern PNG_EXPORT(void,png_read_row) PNGARG((png_structp png_ptr,
+#ifdef PNG_SEQUENTIAL_READ_SUPPORTED
+/* Read a row of data. */
+PNG_EXPORT(void,png_read_row) PNGARG((png_structp png_ptr,

    png_bytep row,
    png_bytep display_row));
    png_bytep row,
    png_bytep display_row));

+#endif

 
 

-/* read the whole image into memory at once. */
-extern PNG_EXPORT(void,png_read_image) PNGARG((png_structp png_ptr,
+#ifdef PNG_SEQUENTIAL_READ_SUPPORTED
+/* Read the whole image into memory at once. */
+PNG_EXPORT(void,png_read_image) PNGARG((png_structp png_ptr,

    png_bytepp image));
    png_bytepp image));

+#endif

 
 

-/* write a row of image data */
-extern PNG_EXPORT(void,png_write_row) PNGARG((png_structp png_ptr,
+/* Write a row of image data */
+PNG_EXPORT(void,png_write_row) PNGARG((png_structp png_ptr,

    png_bytep row));
 
    png_bytep row));
 

-/* write a few rows of image data */
-extern PNG_EXPORT(void,png_write_rows) PNGARG((png_structp png_ptr,
+/* Write a few rows of image data */
+PNG_EXPORT(void,png_write_rows) PNGARG((png_structp png_ptr,

    png_bytepp row, png_uint_32 num_rows));
 
    png_bytepp row, png_uint_32 num_rows));
 

-/* write the image data */
-extern PNG_EXPORT(void,png_write_image) PNGARG((png_structp png_ptr,
+/* Write the image data */
+PNG_EXPORT(void,png_write_image) PNGARG((png_structp png_ptr,

    png_bytepp image));
 
    png_bytepp image));
 

-/* writes the end of the PNG file. */
-extern PNG_EXPORT(void,png_write_end) PNGARG((png_structp png_ptr,
+/* Write the end of the PNG file. */
+PNG_EXPORT(void,png_write_end) PNGARG((png_structp png_ptr,

    png_infop info_ptr));
 
    png_infop info_ptr));
 

-/* read the end of the PNG file. */
-extern PNG_EXPORT(void,png_read_end) PNGARG((png_structp png_ptr,
+#ifdef PNG_SEQUENTIAL_READ_SUPPORTED
+/* Read the end of the PNG file. */
+PNG_EXPORT(void,png_read_end) PNGARG((png_structp png_ptr,

    png_infop info_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,
+/* Free any memory associated with the png_info_struct */
+PNG_EXPORT(void,png_destroy_info_struct) PNGARG((png_structp png_ptr,

    png_infopp info_ptr_ptr));
 
    png_infopp info_ptr_ptr));
 

-/* free any memory associated with the png_struct and the png_info_structs */
-extern PNG_EXPORT(void,png_destroy_read_struct) PNGARG((png_structpp
+/* Free any memory associated with the png_struct and the png_info_structs */
+PNG_EXPORT(void,png_destroy_read_struct) PNGARG((png_structpp

    png_ptr_ptr, png_infopp info_ptr_ptr, png_infopp end_info_ptr_ptr));
 
    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)
+/* Free any memory associated with the png_struct and the png_info_structs */
+PNG_EXPORT(void,png_destroy_write_struct)

    PNGARG((png_structpp png_ptr_ptr, png_infopp info_ptr_ptr));
 
    PNGARG((png_structpp png_ptr_ptr, png_infopp info_ptr_ptr));
 

-/* free any memory used in info_ptr struct (old method - NOT DLL EXPORTED) */
-extern void png_write_destroy_info PNGARG((png_infop info_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,
+/* Set the libpng method of handling chunk CRC errors */
+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
    int crit_action, int ancil_action));
 
 /* Values for png_set_crc_action() to say how to handle CRC errors in


@@ -1055,10 +1840,10 @@ extern PNG_EXPORT(void,png_set_crc_action) PNGARG((png_structp png_ptr,
  * header file (zlib.h) for an explination of the compression functions.
  */
 
  * header file (zlib.h) for an explination of the compression functions.
  */
 

-/* set the filtering method(s) used by libpng.  Currently, the only valid
+/* Set the filtering method(s) used by libpng.  Currently, the only valid

  * value for "method" is 0.
  */
  * value for "method" is 0.
  */

-extern PNG_EXPORT(void,png_set_filter) PNGARG((png_structp png_ptr, int method,
+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
    int filters));
 
 /* Flags for png_set_filter() to say which filters to use.  The flags


@@ -1085,7 +1870,7 @@ extern PNG_EXPORT(void,png_set_filter) PNGARG((png_structp png_ptr, int method,
 #define PNG_FILTER_VALUE_PAETH 4
 #define PNG_FILTER_VALUE_LAST  5
 
 #define PNG_FILTER_VALUE_PAETH 4
 #define PNG_FILTER_VALUE_LAST  5
 

-#if defined(PNG_WRITE_WEIGHTED_FILTER_SUPPORTED) /* EXPERIMENTAL */
+#ifdef PNG_WRITE_WEIGHTED_FILTER_SUPPORTED /* EXPERIMENTAL */

 /* The "heuristic_method" is given by one of the PNG_FILTER_HEURISTIC_
  * defines, either the default (minimum-sum-of-absolute-differences), or
  * the experimental method (weighted-minimum-sum-of-absolute-differences).
 /* 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).


@@ -1114,9 +1899,11 @@ extern PNG_EXPORT(void,png_set_filter) PNGARG((png_structp png_ptr, int method,
  * the weights and costs are set to 1.0, this degenerates the WEIGHTED method
  * to the UNWEIGHTED method, but with added encoding time/computation.
  */
  * the weights and costs are set to 1.0, this degenerates the WEIGHTED method
  * to the UNWEIGHTED method, but with added encoding time/computation.
  */

-extern PNG_EXPORT(void,png_set_filter_heuristics) PNGARG((png_structp png_ptr,
+#ifdef PNG_FLOATING_POINT_SUPPORTED
+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));
    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
 #endif /*  PNG_WRITE_WEIGHTED_FILTER_SUPPORTED */
 
 /* Heuristic used for row filter selection.  These defines should NOT be


@@ -1134,19 +1921,19 @@ extern PNG_EXPORT(void,png_set_filter_heuristics) PNGARG((png_structp png_ptr,
  * for PNG images, and do considerably fewer caclulations.  In the future,
  * these values may not correspond directly to the zlib compression levels.
  */
  * 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,
+PNG_EXPORT(void,png_set_compression_level) PNGARG((png_structp png_ptr,

    int level));
 
    int level));
 

-extern PNG_EXPORT(void,png_set_compression_mem_level)
+PNG_EXPORT(void,png_set_compression_mem_level)

    PNGARG((png_structp png_ptr, int mem_level));
 
    PNGARG((png_structp png_ptr, int mem_level));
 

-extern PNG_EXPORT(void,png_set_compression_strategy)
+PNG_EXPORT(void,png_set_compression_strategy)

    PNGARG((png_structp png_ptr, int strategy));
 
    PNGARG((png_structp png_ptr, int strategy));
 

-extern PNG_EXPORT(void,png_set_compression_window_bits)
+PNG_EXPORT(void,png_set_compression_window_bits)

    PNGARG((png_structp png_ptr, int window_bits));
 
    PNGARG((png_structp png_ptr, int window_bits));
 

-extern PNG_EXPORT(void,png_set_compression_method) PNGARG((png_structp png_ptr,
+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
    int method));
 
 /* These next functions are called for input/output, memory, and error


@@ -1158,9 +1945,10 @@ extern PNG_EXPORT(void,png_set_compression_method) PNGARG((png_structp png_ptr,
  * more information.
  */
 
  * more information.
  */
 

-#if !defined(PNG_NO_STDIO)
+#ifdef PNG_STDIO_SUPPORTED

 /* Initialize the input/output for the PNG file to the default functions. */
 /* Initialize the input/output for the PNG file to the default functions. */

-extern PNG_EXPORT(void,png_init_io) PNGARG((png_structp png_ptr, FILE *fp));
+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
 #endif
 
 /* Replace the (error and abort), and warning functions with user


@@ -1171,115 +1959,178 @@ extern PNG_EXPORT(void,png_init_io) PNGARG((png_structp png_ptr, FILE *fp));
  * default function will be used.
  */
 
  * default function will be used.
  */
 

-extern PNG_EXPORT(void,png_set_error_fn) PNGARG((png_structp png_ptr,
+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 */
    png_voidp error_ptr, png_error_ptr error_fn, png_error_ptr warning_fn));
 
 /* Return the user pointer associated with the error functions */

-extern PNG_EXPORT(png_voidp,png_get_error_ptr) PNGARG((png_structp png_ptr));
+PNG_EXPORT(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).
 
 /* Replace the default data output functions with a user supplied one(s).
  * If buffered output is not used, then output_flush_fn can be set to NULL.
  * If PNG_WRITE_FLUSH_SUPPORTED is not defined at libpng compile time
  * output_flush_fn will be ignored (and thus can be NULL).

+ * It is probably a mistake to use NULL for output_flush_fn if
+ * write_data_fn is not also NULL unless you have built libpng with
+ * PNG_WRITE_FLUSH_SUPPORTED undefined, because in this case libpng's
+ * default flush function, which uses the standard *FILE structure, will
+ * be used.

  */
  */

-extern PNG_EXPORT(void,png_set_write_fn) PNGARG((png_structp png_ptr,
+PNG_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. */
    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_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 */
    png_voidp io_ptr, png_rw_ptr read_data_fn));
 
 /* Return the user pointer associated with the I/O functions */

-extern PNG_EXPORT(png_voidp,png_get_io_ptr) PNGARG((png_structp png_ptr));
+PNG_EXPORT(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_EXPORT(void,png_set_read_status_fn) PNGARG((png_structp png_ptr,

    png_read_status_ptr read_row_fn));
 
    png_read_status_ptr read_row_fn));
 

-extern PNG_EXPORT(void,png_set_write_status_fn) PNGARG((png_structp png_ptr,
+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). */
    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_EXPORT(void,png_set_mem_fn) PNGARG((png_structp png_ptr,

    png_voidp mem_ptr, png_malloc_ptr malloc_fn, png_free_ptr free_fn));
    png_voidp mem_ptr, png_malloc_ptr malloc_fn, png_free_ptr free_fn));

-

 /* Return the user pointer associated with the memory functions */
 /* Return the user pointer associated with the memory functions */

-extern PNG_EXPORT(png_voidp,png_get_mem_ptr) PNGARG((png_structp png_ptr));
-#endif /* PNG_USER_MEM_SUPPORTED */
+PNG_EXPORT(png_voidp,png_get_mem_ptr) PNGARG((png_structp png_ptr));
+#endif

 
 #ifdef PNG_READ_USER_TRANSFORM_SUPPORTED
 
 #ifdef PNG_READ_USER_TRANSFORM_SUPPORTED

-extern PNG_EXPORT(void,png_set_read_user_transform_fn) PNGARG((png_structp
+PNG_EXPORT(void,png_set_read_user_transform_fn) PNGARG((png_structp

    png_ptr, png_user_transform_ptr read_user_transform_fn));
 #endif
 
 #ifdef PNG_WRITE_USER_TRANSFORM_SUPPORTED
    png_ptr, png_user_transform_ptr read_user_transform_fn));
 #endif
 
 #ifdef PNG_WRITE_USER_TRANSFORM_SUPPORTED

-extern PNG_EXPORT(void,png_set_write_user_transform_fn) PNGARG((png_structp
+PNG_EXPORT(void,png_set_write_user_transform_fn) PNGARG((png_structp

    png_ptr, png_user_transform_ptr write_user_transform_fn));
 #endif
 
    png_ptr, png_user_transform_ptr write_user_transform_fn));
 #endif
 

+#if defined(PNG_READ_USER_TRANSFORM_SUPPORTED) || \
+    defined(PNG_WRITE_USER_TRANSFORM_SUPPORTED)
+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 */
+PNG_EXPORT(png_voidp,png_get_user_transform_ptr)
+   PNGARG((png_structp png_ptr));
+#endif
+
+#ifdef PNG_USER_CHUNKS_SUPPORTED
+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));
+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.
  */
 #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_EXPORT(void,png_set_progressive_read_fn) PNGARG((png_structp png_ptr,

    png_voidp progressive_ptr,
    png_progressive_info_ptr info_fn, png_progressive_row_ptr row_fn,
    png_progressive_end_ptr end_fn));
 
    png_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)
+/* Returns the user pointer associated with the push read functions */
+PNG_EXPORT(png_voidp,png_get_progressive_ptr)

    PNGARG((png_structp png_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,
+/* Function to be called when data becomes available */
+PNG_EXPORT(void,png_process_data) PNGARG((png_structp png_ptr,

    png_infop info_ptr, png_bytep buffer, png_size_t buffer_size));
 
    png_infop info_ptr, png_bytep buffer, png_size_t buffer_size));
 

-/* function that combines rows.  Not very much different than the
+/* Function that combines rows.  Not very much different than the

  * png_combine_row() call.  Is this even used?????
  */
  * png_combine_row() call.  Is this even used?????
  */

-extern PNG_EXPORT(void,png_progressive_combine_row) PNGARG((png_structp png_ptr,
+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 */
 
    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));
-
-/* frees a pointer allocated by png_malloc() */
-extern PNG_EXPORT(void,png_free) PNGARG((png_structp png_ptr, png_voidp ptr));
+PNG_EXPORT(png_voidp,png_malloc) PNGARG((png_structp png_ptr,
+   png_alloc_size_t size)) PNG_ALLOCATED;
+/* Added at libpng version 1.4.0 */
+PNG_EXPORT(png_voidp,png_calloc) PNGARG((png_structp png_ptr,
+   png_alloc_size_t size)) PNG_ALLOCATED;
+
+/* Added at libpng version 1.2.4 */
+PNG_EXPORT(png_voidp,png_malloc_warn) PNGARG((png_structp png_ptr,
+   png_alloc_size_t size)) PNG_ALLOCATED;
+
+/* Frees a pointer allocated by png_malloc() */
+PNG_EXPORT(void,png_free) PNGARG((png_structp png_ptr, png_voidp ptr));
+
+/* Free data that was allocated internally */
+PNG_EXPORT(void,png_free_data) PNGARG((png_structp png_ptr,
+   png_infop info_ptr, png_uint_32 free_me, int num));
+/* Reassign responsibility for freeing existing data, whether allocated
+ * by libpng or by the application */
+PNG_EXPORT(void,png_data_freer) PNGARG((png_structp png_ptr,
+   png_infop info_ptr, int freer, png_uint_32 mask));
+/* Assignments for png_data_freer */
+#define PNG_DESTROY_WILL_FREE_DATA 1
+#define PNG_SET_WILL_FREE_DATA 1
+#define PNG_USER_WILL_FREE_DATA 2
+/* 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
 
 #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_EXPORT(png_voidp,png_malloc_default) PNGARG((png_structp png_ptr,
+   png_alloc_size_t size)) PNG_ALLOCATED;
+PNG_EXPORT(void,png_free_default) PNGARG((png_structp png_ptr,

    png_voidp ptr));
    png_voidp ptr));

-#endif /* PNG_USER_MEM_SUPPORTED */
-
-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 */
+#endif

 
 

+#ifndef PNG_NO_ERROR_TEXT

 /* Fatal error in PNG image of libpng - can't continue */
 /* 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));
+PNG_EXPORT(void,png_error) PNGARG((png_structp png_ptr,
+   png_const_charp error_message)) PNG_NORETURN;

 
 /* The same, but the chunk name is prepended to the error string. */
 
 /* 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));
+PNG_EXPORT(void,png_chunk_error) PNGARG((png_structp png_ptr,
+   png_const_charp error_message)) PNG_NORETURN;
+
+#else
+/* Fatal error in PNG image of libpng - can't continue */
+PNG_EXPORT(void,png_err) PNGARG((png_structp png_ptr)) PNG_NORETURN;
+#endif

 
 /* Non-fatal error in libpng.  Can continue, but may have a problem. */
 
 /* 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 message));
+PNG_EXPORT(void,png_warning) PNGARG((png_structp png_ptr,
+   png_const_charp warning_message));

 
 /* Non-fatal error in libpng, chunk name is prepended to message. */
 
 /* Non-fatal error in libpng, chunk name is prepended to message. */

-extern PNG_EXPORT(void,png_chunk_warning) PNGARG((png_structp png_ptr,
-   png_const_charp message));
+PNG_EXPORT(void,png_chunk_warning) PNGARG((png_structp png_ptr,
+   png_const_charp warning_message));
+
+#ifdef PNG_BENIGN_ERRORS_SUPPORTED
+/* Benign error in libpng.  Can continue, but may have a problem.
+ * User can choose whether to handle as a fatal error or as a warning. */
+PNG_EXPORT(void,png_benign_error) PNGARG((png_structp png_ptr,
+   png_const_charp warning_message));
+
+/* Same, chunk name is prepended to message. */
+PNG_EXPORT(void,png_chunk_benign_error) PNGARG((png_structp png_ptr,
+   png_const_charp warning_message));
+
+PNG_EXPORT(void,png_set_benign_errors) PNGARG((png_structp
+   png_ptr, int allowed));
+#endif

 
 /* The png_set_<chunk> functions are for storing values in the png_info_struct.
  * Similarly, the png_get_<chunk> calls are used to read values from the
 
 /* 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


@@ -1294,934 +2145,555 @@ extern PNG_EXPORT(void,png_chunk_warning) PNGARG((png_structp png_ptr,
  * png_info_struct.
  */
 /* Returns "flag" if chunk data is valid in info_ptr. */
  * 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_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. */
 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_EXPORT(png_size_t,png_get_rowbytes) PNGARG((png_structp png_ptr,

 png_infop info_ptr));
 
 png_infop info_ptr));
 

+#ifdef PNG_INFO_IMAGE_SUPPORTED
+/* Returns row_pointers, which is an array of pointers to scanlines that was
+ * returned from png_read_png().
+ */
+PNG_EXPORT(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().
+ */
+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. */
 /* Returns number of color channels in image. */

-extern PNG_EXPORT(png_byte,png_get_channels) PNGARG((png_structp png_ptr,
+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. */
 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_EXPORT(png_uint_32, png_get_image_width) PNGARG((png_structp

 png_ptr, png_infop info_ptr));
 
 /* Returns image height in pixels. */
 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_EXPORT(png_uint_32, png_get_image_height) PNGARG((png_structp

 png_ptr, png_infop info_ptr));
 
 /* Returns image bit_depth. */
 png_ptr, png_infop info_ptr));
 
 /* Returns image bit_depth. */

-extern PNG_EXPORT(png_byte, png_get_bit_depth) PNGARG((png_structp
+PNG_EXPORT(png_byte, png_get_bit_depth) PNGARG((png_structp

 png_ptr, png_infop info_ptr));
 
 /* Returns image color_type. */
 png_ptr, png_infop info_ptr));
 
 /* Returns image color_type. */

-extern PNG_EXPORT(png_byte, png_get_color_type) PNGARG((png_structp
+PNG_EXPORT(png_byte, png_get_color_type) PNGARG((png_structp

 png_ptr, png_infop info_ptr));
 
 /* Returns image filter_type. */
 png_ptr, png_infop info_ptr));
 
 /* Returns image filter_type. */

-extern PNG_EXPORT(png_byte, png_get_filter_type) PNGARG((png_structp
+PNG_EXPORT(png_byte, png_get_filter_type) PNGARG((png_structp

 png_ptr, png_infop info_ptr));
 
 /* Returns image interlace_type. */
 png_ptr, png_infop info_ptr));
 
 /* Returns image interlace_type. */

-extern PNG_EXPORT(png_byte, png_get_interlace_type) PNGARG((png_structp
+PNG_EXPORT(png_byte, png_get_interlace_type) PNGARG((png_structp

 png_ptr, png_infop info_ptr));
 
 /* Returns image compression_type. */
 png_ptr, png_infop info_ptr));
 
 /* Returns image compression_type. */

-extern PNG_EXPORT(png_byte, png_get_compression_type) PNGARG((png_structp
+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. */
 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_EXPORT(png_uint_32, png_get_pixels_per_meter) PNGARG((png_structp

 png_ptr, png_infop info_ptr));
 png_ptr, png_infop info_ptr));

-extern PNG_EXPORT(png_uint_32, png_get_x_pixels_per_meter) PNGARG((png_structp
+PNG_EXPORT(png_uint_32, png_get_x_pixels_per_meter) PNGARG((png_structp

 png_ptr, png_infop info_ptr));
 png_ptr, png_infop info_ptr));

-extern PNG_EXPORT(png_uint_32, png_get_y_pixels_per_meter) PNGARG((png_structp
+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.  */
 png_ptr, png_infop info_ptr));
 
 /* Returns pixel aspect ratio, computed from pHYs chunk data.  */

-extern PNG_EXPORT(float, png_get_pixel_aspect_ratio) PNGARG((png_structp
+#ifdef PNG_FLOATING_POINT_SUPPORTED
+PNG_EXPORT(float, png_get_pixel_aspect_ratio) PNGARG((png_structp

 png_ptr, png_infop info_ptr));
 png_ptr, png_infop info_ptr));

+#endif

 
 /* Returns image x, y offset in pixels or microns, from oFFs chunk data. */
 
 /* Returns image x, y offset in pixels or microns, from oFFs chunk data. */

-extern PNG_EXPORT(png_uint_32, png_get_x_offset_pixels) PNGARG((png_structp
+PNG_EXPORT(png_int_32, png_get_x_offset_pixels) PNGARG((png_structp

 png_ptr, png_infop info_ptr));
 png_ptr, png_infop info_ptr));

-extern PNG_EXPORT(png_uint_32, png_get_y_offset_pixels) PNGARG((png_structp
+PNG_EXPORT(png_int_32, png_get_y_offset_pixels) PNGARG((png_structp

 png_ptr, png_infop info_ptr));
 png_ptr, png_infop info_ptr));

-extern PNG_EXPORT(png_uint_32, png_get_x_offset_microns) PNGARG((png_structp
+PNG_EXPORT(png_int_32, png_get_x_offset_microns) PNGARG((png_structp

 png_ptr, png_infop info_ptr));
 png_ptr, png_infop info_ptr));

-extern PNG_EXPORT(png_uint_32, png_get_y_offset_microns) PNGARG((png_structp
+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 */
 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_EXPORT(png_bytep,png_get_signature) PNGARG((png_structp png_ptr,

 png_infop info_ptr));
 
 png_infop info_ptr));
 

-#if defined(PNG_READ_bKGD_SUPPORTED)
-extern PNG_EXPORT(png_uint_32,png_get_bKGD) PNGARG((png_structp png_ptr,
+#ifdef PNG_bKGD_SUPPORTED
+PNG_EXPORT(png_uint_32,png_get_bKGD) PNGARG((png_structp png_ptr,

    png_infop info_ptr, png_color_16p *background));
    png_infop info_ptr, png_color_16p *background));

-#endif /* PNG_READ_bKGD_SUPPORTED */
+#endif

 
 

-#if defined(PNG_READ_bKGD_SUPPORTED) || defined(PNG_WRITE_bKGD_SUPPORTED)
-extern PNG_EXPORT(void,png_set_bKGD) PNGARG((png_structp png_ptr,
+#ifdef PNG_bKGD_SUPPORTED
+PNG_EXPORT(void,png_set_bKGD) PNGARG((png_structp png_ptr,

    png_infop info_ptr, png_color_16p background));
    png_infop info_ptr, png_color_16p background));

-#endif /* PNG_READ_bKGD_SUPPORTED || PNG_WRITE_bKGD_SUPPORTED */
+#endif

 
 

-#if defined(PNG_READ_cHRM_SUPPORTED)
-extern PNG_EXPORT(png_uint_32,png_get_cHRM) PNGARG((png_structp png_ptr,
+#ifdef PNG_cHRM_SUPPORTED
+#ifdef PNG_FLOATING_POINT_SUPPORTED
+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));
    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 /* PNG_READ_cHRM_SUPPORTED */
+#endif
+#ifdef PNG_FIXED_POINT_SUPPORTED
+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_READ_cHRM_SUPPORTED) || defined(PNG_WRITE_cHRM_SUPPORTED)
-extern PNG_EXPORT(void,png_set_cHRM) PNGARG((png_structp png_ptr,
+#ifdef PNG_cHRM_SUPPORTED
+#ifdef PNG_FLOATING_POINT_SUPPORTED
+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));
    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 /* PNG_READ_cHRM_SUPPORTED || PNG_WRITE_cHRM_SUPPORTED */
+#endif
+#ifdef PNG_FIXED_POINT_SUPPORTED
+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_READ_gAMA_SUPPORTED)
-extern PNG_EXPORT(png_uint_32,png_get_gAMA) PNGARG((png_structp png_ptr,
+#ifdef PNG_gAMA_SUPPORTED
+#ifdef PNG_FLOATING_POINT_SUPPORTED
+PNG_EXPORT(png_uint_32,png_get_gAMA) PNGARG((png_structp png_ptr,

    png_infop info_ptr, double *file_gamma));
    png_infop info_ptr, double *file_gamma));

-#endif /* PNG_READ_gAMA_SUPPORTED */
+#endif
+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_READ_gAMA_SUPPORTED) || defined(PNG_WRITE_gAMA_SUPPORTED)
-extern PNG_EXPORT(void,png_set_gAMA) PNGARG((png_structp png_ptr,
+#ifdef PNG_gAMA_SUPPORTED
+#ifdef PNG_FLOATING_POINT_SUPPORTED
+PNG_EXPORT(void,png_set_gAMA) PNGARG((png_structp png_ptr,

    png_infop info_ptr, double file_gamma));
    png_infop info_ptr, double file_gamma));

-#endif /* PNG_READ_gAMA_SUPPORTED || PNG_WRITE_gAMA_SUPPORTED */
+#endif
+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_READ_hIST_SUPPORTED)
-extern PNG_EXPORT(png_uint_32,png_get_hIST) PNGARG((png_structp png_ptr,
+#ifdef PNG_hIST_SUPPORTED
+PNG_EXPORT(png_uint_32,png_get_hIST) PNGARG((png_structp png_ptr,

    png_infop info_ptr, png_uint_16p *hist));
    png_infop info_ptr, png_uint_16p *hist));

-#endif /* PNG_READ_hIST_SUPPORTED */
+#endif

 
 

-#if defined(PNG_READ_hIST_SUPPORTED) || defined(PNG_WRITE_hIST_SUPPORTED)
-extern PNG_EXPORT(void,png_set_hIST) PNGARG((png_structp png_ptr,
+#ifdef PNG_hIST_SUPPORTED
+PNG_EXPORT(void,png_set_hIST) PNGARG((png_structp png_ptr,

    png_infop info_ptr, png_uint_16p hist));
    png_infop info_ptr, png_uint_16p hist));

-#endif /* PNG_READ_hIST_SUPPORTED || PNG_WRITE_hIST_SUPPORTED */
+#endif

 
 

-extern PNG_EXPORT(png_uint_32,png_get_IHDR) PNGARG((png_structp png_ptr,
+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,
    png_infop info_ptr, png_uint_32 *width, png_uint_32 *height,

-   int *bit_depth, int *color_type, int *interlace_type,
-   int *compression_type, int *filter_type));
+   int *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_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,
    png_infop info_ptr, png_uint_32 width, png_uint_32 height, int bit_depth,

-   int color_type, int interlace_type, int compression_type, int filter_type));
+   int color_type, int interlace_method, int compression_method,
+   int filter_method));

 
 

-#if defined(PNG_READ_oFFs_SUPPORTED)
-extern PNG_EXPORT(png_uint_32,png_get_oFFs) PNGARG((png_structp png_ptr,
-   png_infop info_ptr, png_uint_32 *offset_x, png_uint_32 *offset_y,
+#ifdef PNG_oFFs_SUPPORTED
+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));
    int *unit_type));

-#endif /* PNG_READ_oFFs_SUPPORTED */
+#endif

 
 

-#if defined(PNG_READ_oFFs_SUPPORTED) || defined(PNG_WRITE_oFFs_SUPPORTED)
-extern PNG_EXPORT(void,png_set_oFFs) PNGARG((png_structp png_ptr,
-   png_infop info_ptr, png_uint_32 offset_x, png_uint_32 offset_y,
+#ifdef PNG_oFFs_SUPPORTED
+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));
    int unit_type));

-#endif /* PNG_READ_oFFs_SUPPORTED || PNG_WRITE_oFFs_SUPPORTED */
+#endif

 
 

-#if defined(PNG_READ_pCAL_SUPPORTED)
-extern PNG_EXPORT(png_uint_32,png_get_pCAL) PNGARG((png_structp png_ptr,
+#ifdef PNG_pCAL_SUPPORTED
+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));
    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 /* PNG_READ_pCAL_SUPPORTED */
+#endif

 
 

-#if defined(PNG_READ_pCAL_SUPPORTED) || defined(PNG_WRITE_pCAL_SUPPORTED)
-extern PNG_EXPORT(void,png_set_pCAL) PNGARG((png_structp png_ptr,
+#ifdef PNG_pCAL_SUPPORTED
+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));
    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 /* PNG_READ_pCAL_SUPPORTED || PNG_WRITE_pCAL_SUPPORTED */
+#endif

 
 

-#if defined(PNG_READ_pHYs_SUPPORTED)
-extern PNG_EXPORT(png_uint_32,png_get_pHYs) PNGARG((png_structp png_ptr,
+#ifdef PNG_pHYs_SUPPORTED
+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));
    png_infop info_ptr, png_uint_32 *res_x, png_uint_32 *res_y, int *unit_type));

-#endif /* PNG_READ_pHYs_SUPPORTED */
+#endif

 
 

-#if defined(PNG_READ_pHYs_SUPPORTED) || defined(PNG_WRITE_pHYs_SUPPORTED)
-extern PNG_EXPORT(void,png_set_pHYs) PNGARG((png_structp png_ptr,
+#ifdef PNG_pHYs_SUPPORTED
+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));
    png_infop info_ptr, png_uint_32 res_x, png_uint_32 res_y, int unit_type));

-#endif /* PNG_READ_pHYs_SUPPORTED || PNG_WRITE_pHYs_SUPPORTED */
+#endif

 
 

-extern PNG_EXPORT(png_uint_32,png_get_PLTE) PNGARG((png_structp png_ptr,
+PNG_EXPORT(png_uint_32,png_get_PLTE) PNGARG((png_structp png_ptr,

    png_infop info_ptr, png_colorp *palette, int *num_palette));
 
    png_infop info_ptr, png_colorp *palette, int *num_palette));
 

-extern PNG_EXPORT(void,png_set_PLTE) PNGARG((png_structp png_ptr,
+PNG_EXPORT(void,png_set_PLTE) PNGARG((png_structp png_ptr,

    png_infop info_ptr, png_colorp palette, int num_palette));
 
    png_infop info_ptr, png_colorp palette, int num_palette));
 

-#if defined(PNG_READ_sBIT_SUPPORTED)
-extern PNG_EXPORT(png_uint_32,png_get_sBIT) PNGARG((png_structp png_ptr,
+#ifdef PNG_sBIT_SUPPORTED
+PNG_EXPORT(png_uint_32,png_get_sBIT) PNGARG((png_structp png_ptr,

    png_infop info_ptr, png_color_8p *sig_bit));
    png_infop info_ptr, png_color_8p *sig_bit));

-#endif /* PNG_READ_sBIT_SUPPORTED */
+#endif

 
 

-#if defined(PNG_READ_sBIT_SUPPORTED) || defined(PNG_WRITE_sBIT_SUPPORTED)
-extern PNG_EXPORT(void,png_set_sBIT) PNGARG((png_structp png_ptr,
+#ifdef PNG_sBIT_SUPPORTED
+PNG_EXPORT(void,png_set_sBIT) PNGARG((png_structp png_ptr,

    png_infop info_ptr, png_color_8p sig_bit));
    png_infop info_ptr, png_color_8p sig_bit));

-#endif /* PNG_READ_sBIT_SUPPORTED || PNG_WRITE_sBIT_SUPPORTED */
+#endif

 
 

-#if defined(PNG_READ_sRGB_SUPPORTED)
-extern PNG_EXPORT(png_uint_32,png_get_sRGB) PNGARG((png_structp png_ptr,
+#ifdef PNG_sRGB_SUPPORTED
+PNG_EXPORT(png_uint_32,png_get_sRGB) PNGARG((png_structp png_ptr,

    png_infop info_ptr, int *intent));
    png_infop info_ptr, int *intent));

-#endif /* PNG_READ_sRGB_SUPPORTED */
+#endif

 
 

-#if defined(PNG_READ_sRGB_SUPPORTED) || defined(PNG_WRITE_sRGB_SUPPORTED)
-extern PNG_EXPORT(void,png_set_sRGB) PNGARG((png_structp png_ptr,
+#ifdef PNG_sRGB_SUPPORTED
+PNG_EXPORT(void,png_set_sRGB) PNGARG((png_structp png_ptr,

    png_infop info_ptr, int intent));
    png_infop info_ptr, int intent));

-extern PNG_EXPORT(void,png_set_sRGB_gAMA_and_cHRM) PNGARG((png_structp png_ptr,
+PNG_EXPORT(void,png_set_sRGB_gAMA_and_cHRM) PNGARG((png_structp png_ptr,

    png_infop info_ptr, int intent));
    png_infop info_ptr, int intent));

-#endif /* PNG_READ_sRGB_SUPPORTED || PNG_WRITE_sRGB_SUPPORTED */
-
-#if defined(PNG_READ_tEXt_SUPPORTED) || defined(PNG_READ_zTXt_SUPPORTED)
-/* png_get_text also returns the number of text chunks in text_ptr */
-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 /* PNG_READ_tEXt_SUPPORTED || PNG_READ_zTXt_SUPPORTED */
-
-#if defined(PNG_READ_tEXt_SUPPORTED) || defined(PNG_WRITE_tEXt_SUPPORTED) || \
-    defined(PNG_READ_zTXt_SUPPORTED) || defined(PNG_WRITE_zTXt_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 /* PNG_READ_OR_WRITE_tEXt_OR_zTXt_SUPPORTED */
-
-#if defined(PNG_READ_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 /* PNG_READ_tIME_SUPPORTED */
-
-#if defined(PNG_READ_tIME_SUPPORTED) || defined(PNG_WRITE_tIME_SUPPORTED)
-extern PNG_EXPORT(void,png_set_tIME) PNGARG((png_structp png_ptr,
-   png_infop info_ptr, png_timep mod_time));
-#endif /* PNG_READ_tIME_SUPPORTED || PNG_WRITE_tIME_SUPPORTED */
-
-#if defined(PNG_READ_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 /* PNG_READ_tRNS_SUPPORTED */
-
-#if defined(PNG_READ_tRNS_SUPPORTED) || defined(PNG_WRITE_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 /* PNG_READ_tRNS_SUPPORTED || PNG_WRITE_tRNS_SUPPORTED */
-
-/* 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)
-#ifndef PNG_DEBUG_FILE
-#define PNG_DEBUG_FILE stderr
-#endif /* PNG_DEBUG_FILE */
-
-#define png_debug(l,m)        if (PNG_DEBUG > l) \
-                                 fprintf(PNG_DEBUG_FILE,"%s"m,(l==1 ? "\t" : \
-                                    (l==2 ? "\t\t":(l>2 ? "\t\t\t":""))))
-#define png_debug1(l,m,p1)    if (PNG_DEBUG > l) \
-                                 fprintf(PNG_DEBUG_FILE,"%s"m,(l==1 ? "\t" : \
-                                    (l==2 ? "\t\t":(l>2 ? "\t\t\t":""))),p1)
-#define png_debug2(l,m,p1,p2) if (PNG_DEBUG > l) \
-                                 fprintf(PNG_DEBUG_FILE,"%s"m,(l==1 ? "\t" : \
-                                    (l==2 ? "\t\t":(l>2 ? "\t\t\t":""))),p1,p2)
-#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_version) PNGARG((png_structp png_ptr));
-
-#ifdef PNG_NO_EXTERN
-/* this only gets included in png.c */
-png_charp
-png_get_header_version(png_structp png_ptr)
-{
-   if(png_ptr == NULL)
-     /* silence compiler warning about unused png_ptr */ ;
-   return("\n libpng version 1.0.3 - January 14, 1999 (header)\n");
-}

 #endif
 
 #endif
 

-#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)(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)(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 */
-
-/* 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.
- */
-
-#if defined(PNG_INTERNAL)
-
-/* Various modes of operation.  Note that after an init, mode is set to
- * zero automatically when the structure is created.
- */
-#define PNG_BEFORE_IHDR       0x00
-#define PNG_HAVE_IHDR         0x01
-#define PNG_HAVE_PLTE         0x02
-#define PNG_HAVE_IDAT         0x04
-#define PNG_AFTER_IDAT        0x08
-#define PNG_HAVE_IEND         0x10
-#define PNG_HAVE_gAMA         0x20
-#define PNG_HAVE_cHRM         0x40
-#define PNG_HAVE_sRGB         0x80
-
-/* push model modes */
-#define PNG_READ_SIG_MODE   0
-#define PNG_READ_CHUNK_MODE 1
-#define PNG_READ_IDAT_MODE  2
-#define PNG_SKIP_MODE       3
-#define PNG_READ_tEXt_MODE  4
-#define PNG_READ_zTXt_MODE  5
-#define PNG_READ_DONE_MODE  6
-#define PNG_ERROR_MODE      7
-
-/* 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             0x8000
-#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 */
-
-/* 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_PALETTE             0x1000
-#define PNG_FLAG_FREE_TRANS               0x2000
-#define PNG_FLAG_FREE_HIST                0x4000
-#define PNG_FLAG_HAVE_CHUNK_HEADER        0x8000L
-#define PNG_FLAG_WROTE_tIME              0x10000L
-#define PNG_FLAG_BACKGROUND_IS_GRAY      0x20000L
-
-#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)))
-
-/* 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. */
-extern png_byte FARDATA png_sig[8];
-
-/* Constant strings for known chunk types.  If you need to add a chunk,
- * add a string holding the name here.  See png.c for more details.  We
- * can't selectively include these, since we still check for chunk in the
- * wrong locations with these labels.
- */
-extern png_byte FARDATA png_IHDR[5];
-extern png_byte FARDATA png_IDAT[5];
-extern png_byte FARDATA png_IEND[5];
-extern png_byte FARDATA png_PLTE[5];
-extern png_byte FARDATA png_bKGD[5];
-extern png_byte FARDATA png_cHRM[5];
-extern png_byte FARDATA png_gAMA[5];
-extern png_byte FARDATA png_hIST[5];
-extern png_byte FARDATA png_oFFs[5];
-extern png_byte FARDATA png_pCAL[5];
-extern png_byte FARDATA png_pHYs[5];
-extern png_byte FARDATA png_sBIT[5];
-extern png_byte FARDATA png_sRGB[5];
-extern png_byte FARDATA png_tEXt[5];
-extern png_byte FARDATA png_tIME[5];
-extern png_byte FARDATA png_tRNS[5];
-extern png_byte FARDATA png_zTXt[5];
-
-#endif /* PNG_NO_EXTERN */
-
-/* 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)
-#if defined(PNG_READ_pCAL_SUPPORTED)
-#define png_get_int_32(buf) ( *((png_int_32p) (buf)))
-#endif /* PNG_READ_pCAL_SUPPORTED */
-#define png_get_uint_32(buf) ( *((png_uint_32p) (buf)))
-#define png_get_uint_16(buf) ( *((png_uint_16p) (buf)))
-#else
-#if defined(PNG_READ_pCAL_SUPPORTED)
-PNG_EXTERN png_int_32 png_get_int_32 PNGARG((png_bytep buf));
-#endif /* PNG_READ_pCAL_SUPPORTED */
-PNG_EXTERN png_uint_32 png_get_uint_32 PNGARG((png_bytep buf));
-PNG_EXTERN png_uint_16 png_get_uint_16 PNGARG((png_bytep buf));
-#endif /* PNG_READ_BIG_ENDIAN_SUPPORTED */
-
-/* Initialize png_ptr struct for reading, and allocate any other memory.
- * (old interface - NOT DLL EXPORTED).
- */
-extern void png_read_init PNGARG((png_structp png_ptr));
-
-/* Initialize png_ptr struct for writing, and allocate any other memory.
- * (old interface - NOT DLL EXPORTED).
- */
-extern void png_write_init PNGARG((png_structp png_ptr));
-
-/* 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_EXTERN void png_destroy_struct_2 PNGARG((png_voidp struct_ptr,
-   png_free_ptr free_fn));
-
-/* 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));
-
-/* 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));
-
-/* 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));
-
-/* 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));
+#ifdef PNG_iCCP_SUPPORTED
+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
 
 #endif
 

-/* Place a 32-bit number into a buffer in PNG byte order (big-endian).
- * The only currently known PNG chunks that use signed numbers are
- * the ancillary extension chunks, oFFs and pCAL.
- */
-PNG_EXTERN void png_save_uint_32 PNGARG((png_bytep buf, png_uint_32 i));
-
-#if defined(PNG_WRITE_pCAL_SUPPORTED)
-PNG_EXTERN void png_save_int_32 PNGARG((png_bytep buf, png_int_32 i));
+#ifdef PNG_iCCP_SUPPORTED
+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
 
 #endif
 

-/* 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.
- */
-PNG_EXTERN void png_save_uint_16 PNGARG((png_bytep buf, unsigned int i));
-
-/* 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_type, int filter_type,
-   int interlace_type));
-
-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)
-PNG_EXTERN void png_write_gAMA PNGARG((png_structp png_ptr, double file_gamma));
-#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)
-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
-
-#if defined(PNG_WRITE_sRGB_SUPPORTED)
-PNG_EXTERN void png_write_sRGB PNGARG((png_structp png_ptr,
-   int intent));
-#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_zTXt_SUPPORTED) || \
-    defined(PNG_WRITE_pCAL_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_oFFs_SUPPORTED)
-PNG_EXTERN void png_write_oFFs PNGARG((png_structp png_ptr,
-   png_uint_32 x_offset, png_uint_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));
+#ifdef PNG_sPLT_SUPPORTED
+PNG_EXPORT(png_uint_32,png_get_sPLT) PNGARG((png_structp png_ptr,
+   png_infop info_ptr, png_sPLT_tpp entries));

 #endif
 
 #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
-
-/* 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 */
-PNG_EXTERN void png_do_read_interlace PNGARG((png_row_infop row_info,
-   png_bytep row, int pass, png_uint_32 transformations));
-#endif
-
-#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));
+#ifdef PNG_sPLT_SUPPORTED
+PNG_EXPORT(void,png_set_sPLT) PNGARG((png_structp png_ptr,
+   png_infop info_ptr, png_sPLT_tp entries, int nentries));

 #endif
 
 #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));
+#ifdef PNG_TEXT_SUPPORTED
+/* png_get_text also returns the number of text chunks in *num_text */
+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
 
 #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
+/* 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_WRITE_INVERT_ALPHA_SUPPORTED)
-PNG_EXTERN void png_do_write_invert_alpha PNGARG((png_row_infop row_info,
-   png_bytep row));
+#ifdef PNG_TEXT_SUPPORTED
+PNG_EXPORT(void,png_set_text) PNGARG((png_structp png_ptr,
+   png_infop info_ptr, png_textp text_ptr, int num_text));

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

 #endif
 
 #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));
+#ifdef PNG_tIME_SUPPORTED
+PNG_EXPORT(void,png_set_tIME) PNGARG((png_structp png_ptr,
+   png_infop info_ptr, png_timep mod_time));

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

 #endif
 
 #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));
+#ifdef PNG_tRNS_SUPPORTED
+PNG_EXPORT(void,png_set_tRNS) PNGARG((png_structp png_ptr,
+   png_infop info_ptr, png_bytep trans_alpha, int num_trans,
+   png_color_16p trans_color));

 #endif
 
 #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));
+#ifdef PNG_tRNS_SUPPORTED

 #endif
 
 #endif
 

-#if defined(PNG_READ_PACK_SUPPORTED)
-PNG_EXTERN void png_do_unpack PNGARG((png_row_infop row_info, png_bytep row));
+#ifdef PNG_sCAL_SUPPORTED
+#ifdef PNG_FLOATING_POINT_SUPPORTED
+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
+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

-
-#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
 #endif

+#endif /* PNG_sCAL_SUPPORTED */

 
 

-#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));
+#ifdef PNG_sCAL_SUPPORTED
+#ifdef PNG_FLOATING_POINT_SUPPORTED
+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
+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 */
+
+#ifdef PNG_HANDLE_AS_UNKNOWN_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
+*/
+PNG_EXPORT(void, png_set_keep_unknown_chunks) PNGARG((png_structp
+   png_ptr, int keep, png_bytep chunk_list, int num_chunks));
+PNG_EXPORT(int,png_handle_as_unknown) PNGARG((png_structp png_ptr, png_bytep
+   chunk_name));
+#endif
+#ifdef PNG_UNKNOWN_CHUNKS_SUPPORTED
+PNG_EXPORT(void, png_set_unknown_chunks) PNGARG((png_structp png_ptr,
+   png_infop info_ptr, png_unknown_chunkp unknowns, int num_unknowns));
+PNG_EXPORT(void, png_set_unknown_chunk_location)
+   PNGARG((png_structp png_ptr, png_infop info_ptr, int chunk, int location));
+PNG_EXPORT(png_uint_32,png_get_unknown_chunks) PNGARG((png_structp
+   png_ptr, png_infop info_ptr, png_unknown_chunkpp entries));
+#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);
+ */
+PNG_EXPORT(void, png_set_invalid) PNGARG((png_structp png_ptr,
+   png_infop info_ptr, int mask));
+
+#ifdef PNG_INFO_IMAGE_SUPPORTED
+/* The "params" pointer is currently not used and is for future expansion. */
+PNG_EXPORT(void, png_read_png) PNGARG((png_structp png_ptr,
+                        png_infop info_ptr,
+                        int transforms,
+                        png_voidp params));
+PNG_EXPORT(void, png_write_png) PNGARG((png_structp png_ptr,
+                        png_infop info_ptr,
+                        int transforms,
+                        png_voidp params));
+#endif
+
+PNG_EXPORT(png_charp,png_get_copyright) PNGARG((png_structp png_ptr));
+PNG_EXPORT(png_charp,png_get_header_ver) PNGARG((png_structp png_ptr));
+PNG_EXPORT(png_charp,png_get_header_version) PNGARG((png_structp
+    png_ptr));
+PNG_EXPORT(png_charp,png_get_libpng_ver) PNGARG((png_structp png_ptr));
+
+#ifdef PNG_MNG_FEATURES_SUPPORTED
+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
+
+/* 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
+PNG_EXPORT(void,png_set_strip_error_numbers) PNGARG((png_structp
+   png_ptr, png_uint_32 strip_mode));

 #endif
 
 #endif
 

-#if defined(PNG_READ_16_TO_8_SUPPORTED)
-PNG_EXTERN void png_do_chop PNGARG((png_row_infop row_info, png_bytep row));
+/* Added in libpng-1.2.6 */
+#ifdef PNG_SET_USER_LIMITS_SUPPORTED
+PNG_EXPORT(void,png_set_user_limits) PNGARG((png_structp
+   png_ptr, png_uint_32 user_width_max, png_uint_32 user_height_max));
+PNG_EXPORT(png_uint_32,png_get_user_width_max) PNGARG((png_structp
+   png_ptr));
+PNG_EXPORT(png_uint_32,png_get_user_height_max) PNGARG((png_structp
+   png_ptr));
+/* Added in libpng-1.4.0 */
+PNG_EXPORT(void,png_set_chunk_cache_max) PNGARG((png_structp
+   png_ptr, png_uint_32 user_chunk_cache_max));
+PNG_EXPORT(png_uint_32,png_get_chunk_cache_max)
+   PNGARG((png_structp png_ptr));
+/* Added in libpng-1.4.1 */
+PNG_EXPORT(void,png_set_chunk_malloc_max) PNGARG((png_structp
+   png_ptr, png_alloc_size_t user_chunk_cache_max));
+PNG_EXPORT(png_alloc_size_t,png_get_chunk_malloc_max)
+   PNGARG((png_structp png_ptr));

 #endif
 
 #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_INCH_CONVERSIONS) && defined(PNG_FLOATING_POINT_SUPPORTED)
+PNG_EXPORT(png_uint_32,png_get_pixels_per_inch) PNGARG((png_structp png_ptr,
+png_infop info_ptr));

 
 

-#  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
+PNG_EXPORT(png_uint_32,png_get_x_pixels_per_inch) PNGARG((png_structp png_ptr,
+png_infop info_ptr));

 
 

-#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
+PNG_EXPORT(png_uint_32,png_get_y_pixels_per_inch) PNGARG((png_structp png_ptr,
+png_infop info_ptr));

 
 

-#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
+PNG_EXPORT(float,png_get_x_offset_inches) PNGARG((png_structp png_ptr,
+png_infop info_ptr));

 
 

-#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
+PNG_EXPORT(float,png_get_y_offset_inches) PNGARG((png_structp png_ptr,
+png_infop info_ptr));

 
 

-#if defined(PNG_READ_BACKGROUND_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));
-#endif
+#ifdef PNG_pHYs_SUPPORTED
+PNG_EXPORT(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 */

 
 

-#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
+/* Added in libpng-1.4.0 */
+#ifdef PNG_IO_STATE_SUPPORTED
+PNG_EXPORT(png_uint_32,png_get_io_state) PNGARG((png_structp png_ptr));

 
 

-#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
+PNG_EXPORT(png_bytep,png_get_io_chunk_name)
+   PNGARG((png_structp png_ptr));

 
 

-/* The following decodes the appropriate chunks, and does error correction,
- * then calls the appropriate callback for the chunk if it is valid.
+/* The flags returned by png_get_io_state() are the following: */
+#define PNG_IO_NONE        0x0000   /* no I/O at this moment */
+#define PNG_IO_READING     0x0001   /* currently reading */
+#define PNG_IO_WRITING     0x0002   /* currently writing */
+#define PNG_IO_SIGNATURE   0x0010   /* currently at the file signature */
+#define PNG_IO_CHUNK_HDR   0x0020   /* currently at the chunk header */
+#define PNG_IO_CHUNK_DATA  0x0040   /* currently at the chunk data */
+#define PNG_IO_CHUNK_CRC   0x0080   /* currently at the chunk crc */
+#define PNG_IO_MASK_OP     0x000f   /* current operation: reading/writing */
+#define PNG_IO_MASK_LOC    0x00f0   /* current location: sig/hdr/data/crc */
+#endif /* ?PNG_IO_STATE_SUPPORTED */
+
+/* Maintainer: Put new public prototypes here ^, in libpng.3, and project
+ * defs

  */
 
  */
 

-/* 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_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_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_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_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_tRNS_SUPPORTED)
-PNG_EXTERN void png_handle_tRNS PNGARG((png_structp png_ptr, png_infop info_ptr,
-   png_uint_32 length));
-#endif
+#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. :-) ]
+ */

 
 

-#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
+ /* fg and bg should be in `gamma 1.0' space; alpha is the opacity          */

 
 

-#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
+#  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); }

 
 

-#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
+#  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); }

 
 

-#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
+#else  /* Standard method using integer division */

 
 

-#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
+#  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)

 
 

-#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
+#  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 */

 
 

-#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));
+#ifdef PNG_USE_READ_MACROS
+/* Inline macros to do direct reads of bytes from the input buffer.
+ * The png_get_int_32() routine assumes we are using two's complement
+ * format for negative values, which is almost certainly true.
+ */
+#  define png_get_uint_32(buf) \
+     (((png_uint_32)(*(buf)) << 24) + \
+      ((png_uint_32)(*((buf) + 1)) << 16) + \
+      ((png_uint_32)(*((buf) + 2)) << 8) + \
+      ((png_uint_32)(*((buf) + 3))))
+#  define png_get_uint_16(buf) \
+     (((png_uint_32)(*(buf)) << 8) + \
+      ((png_uint_32)(*((buf) + 1))))
+#  define png_get_int_32(buf) \
+     ((png_int_32)((*(buf) & 0x80) \
+      ? -((png_int_32)((png_get_uint_32(buf) ^ 0xffffffff)+1)) \
+      : (png_int_32)png_get_uint_32(buf)))
+#else
+PNG_EXPORT(png_uint_32,png_get_uint_32) PNGARG((png_bytep buf));
+PNG_EXPORT(png_uint_16,png_get_uint_16) PNGARG((png_bytep buf));
+#ifdef PNG_GET_INT_32_SUPPORTED
+PNG_EXPORT(png_int_32,png_get_int_32) PNGARG((png_bytep buf));

 #endif
 #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
 #endif

+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. */

 
 

-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));
+/* Place a 32-bit number into a buffer in PNG byte order (big-endian). */
+PNG_EXPORT(void,png_save_uint_32)
+   PNGARG((png_bytep buf, png_uint_32 i));
+PNG_EXPORT(void,png_save_int_32)
+   PNGARG((png_bytep buf, png_int_32 i));

 
 

-#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_fill_buffer PNGARG((png_structp png_ptr,
-   png_bytep buffer, png_size_t length));
-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
+/* 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.
+ */
+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. */

 
 

-#endif /* PNG_PROGRESSIVE_READ_SUPPORTED */
+/* ************************************************************************* */

 
 

-#endif /* PNG_INTERNAL */
+/* Various modes of operation.  Note that after an init, mode is set to
+ * zero automatically when the structure is created.
+ */
+#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
+#define PNG_HAVE_gAMA               0x20
+#define PNG_HAVE_cHRM               0x40

 
 #ifdef __cplusplus
 }
 #endif
 
 
 #ifdef __cplusplus
 }
 #endif
 

-/* do not put anything past this line */
-#endif /* _PNG_H */
+#endif /* PNG_VERSION_INFO_ONLY */
+/* Do not put anything past this line */
+#endif /* PNG_H */