Invalid conversion compile error fix (GTK+ 2.12.9)

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

diff --git a/src/png/png.h b/src/png/png.h
index 3873728b426eb1e9e9a9fcc14b121efb69d93eb5..e22ec5c5dfc70e1e95333015de241545cf37466e 100644 (file)
--- a/src/png/png.h
+++ b/src/png/png.h
@@ -1,23 +1,26 @@
+

 /* png.h - header file for PNG reference library
  *
 /* png.h - header file for PNG reference library
  *

- * libpng version 1.2.34 - December 18, 2008
- * Copyright (c) 1998-2008 Glenn Randers-Pehrson
+ * libpng version 1.5.7 - December 15, 2011
+ * Copyright (c) 1998-2011 Glenn Randers-Pehrson

  * (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger)
  * (Version 0.88 Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.)
  *
  * (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger)
  * (Version 0.88 Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.)
  *

+ * This code is released under the libpng license (See LICENSE, below)
+ *

  * Authors and maintainers:
  * Authors and maintainers:

- *  libpng versions 0.71, May 1995, through 0.88, January 1996: Guy Schalnat
- *  libpng versions 0.89c, June 1996, through 0.96, May 1997: Andreas Dilger
- *  libpng versions 0.97, January 1998, through 1.2.34 - December 18, 2008: Glenn
- *  See also "Contributing Authors", below.
+ *   libpng versions 0.71, May 1995, through 0.88, January 1996: Guy Schalnat
+ *   libpng versions 0.89c, June 1996, through 0.96, May 1997: Andreas Dilger
+ *   libpng versions 0.97, January 1998, through 1.5.7 - December 15, 2011: Glenn
+ *   See also "Contributing Authors", below.

  *
  * Note about libpng version numbers:
  *
  *
  * Note about libpng version numbers:
  *

- *    Due to various miscommunications, unforeseen code incompatibilities
- *    and occasional factors outside the authors' control, version numbering
- *    on the library has not always been consistent and straightforward.
- *    The following table summarizes matters since version 0.89c, which was
- *    the first widely used release:
+ *   Due to various miscommunications, unforeseen code incompatibilities
+ *   and occasional factors outside the authors' control, version numbering
+ *   on the library has not always been consistent and straightforward.
+ *   The following table summarizes matters since version 0.89c, which was
+ *   the first widely used release:

  *
  *    source                 png.h  png.h  shared-lib
  *    version                string   int  version
  *
  *    source                 png.h  png.h  shared-lib
  *    version                string   int  version


@@ -102,142 +105,88 @@
  *    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
  *    1.0.16                  10    10016  10.so.0.1.0.16
  *    1.2.6                   13    10206  12.so.0.1.2.6
  *    1.2.7beta1-2            13    10207  12.so.0.1.2.7beta1-2

- *    1.0.17rc1               10    10017  10.so.0.1.0.17rc1
+ *    1.0.17rc1               10    10017  12.so.0.1.0.17rc1

  *    1.2.7rc1                13    10207  12.so.0.1.2.7rc1
  *    1.2.7rc1                13    10207  12.so.0.1.2.7rc1

- *    1.0.17                  10    10017  10.so.0.1.0.17
+ *    1.0.17                  10    10017  12.so.0.1.0.17

  *    1.2.7                   13    10207  12.so.0.1.2.7
  *    1.2.8beta1-5            13    10208  12.so.0.1.2.8beta1-5
  *    1.2.7                   13    10207  12.so.0.1.2.7
  *    1.2.8beta1-5            13    10208  12.so.0.1.2.8beta1-5

- *    1.0.18rc1-5             10    10018  10.so.0.1.0.18rc1-5
+ *    1.0.18rc1-5             10    10018  12.so.0.1.0.18rc1-5

  *    1.2.8rc1-5              13    10208  12.so.0.1.2.8rc1-5
  *    1.2.8rc1-5              13    10208  12.so.0.1.2.8rc1-5

- *    1.0.18                  10    10018  10.so.0.1.0.18
+ *    1.0.18                  10    10018  12.so.0.1.0.18

  *    1.2.8                   13    10208  12.so.0.1.2.8
  *    1.2.9beta1-3            13    10209  12.so.0.1.2.9beta1-3
  *    1.2.9beta4-11           13    10209  12.so.0.9[.0]
  *    1.2.9rc1                13    10209  12.so.0.9[.0]
  *    1.2.9                   13    10209  12.so.0.9[.0]
  *    1.2.8                   13    10208  12.so.0.1.2.8
  *    1.2.9beta1-3            13    10209  12.so.0.1.2.9beta1-3
  *    1.2.9beta4-11           13    10209  12.so.0.9[.0]
  *    1.2.9rc1                13    10209  12.so.0.9[.0]
  *    1.2.9                   13    10209  12.so.0.9[.0]

- *    1.2.10beta1-8           13    10210  12.so.0.10[.0]
- *    1.2.10rc1-3             13    10210  12.so.0.10[.0]
+ *    1.2.10beta1-7           13    10210  12.so.0.10[.0]
+ *    1.2.10rc1-2             13    10210  12.so.0.10[.0]

  *    1.2.10                  13    10210  12.so.0.10[.0]
  *    1.2.10                  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]
  *    1.2.11beta1-4           13    10211  12.so.0.11[.0]

- *    1.0.19rc1-5             10    10019  10.so.0.19[.0]
- *    1.2.11rc1-5             13    10211  12.so.0.11[.0]
- *    1.0.19                  10    10019  10.so.0.19[.0]
+ *    1.4.0beta7-8            14    10400  14.so.0.0[.0]

  *    1.2.11                  13    10211  12.so.0.11[.0]
  *    1.2.11                  13    10211  12.so.0.11[.0]

- *    1.0.20                  10    10020  10.so.0.20[.0]

  *    1.2.12                  13    10212  12.so.0.12[.0]
  *    1.2.12                  13    10212  12.so.0.12[.0]

- *    1.2.13beta1             13    10213  12.so.0.13[.0]
- *    1.0.21                  10    10021  10.so.0.21[.0]
+ *    1.4.0beta9-14           14    10400  14.so.0.0[.0]

  *    1.2.13                  13    10213  12.so.0.13[.0]
  *    1.2.13                  13    10213  12.so.0.13[.0]

- *    1.2.14beta1-2           13    10214  12.so.0.14[.0]
- *    1.0.22rc1               10    10022  10.so.0.22[.0]
- *    1.2.14rc1               13    10214  12.so.0.14[.0]
- *    1.0.22                  10    10022  10.so.0.22[.0]
- *    1.2.14                  13    10214  12.so.0.14[.0]
- *    1.2.15beta1-6           13    10215  12.so.0.15[.0]
- *    1.0.23rc1-5             10    10023  10.so.0.23[.0]
- *    1.2.15rc1-5             13    10215  12.so.0.15[.0]
- *    1.0.23                  10    10023  10.so.0.23[.0]
- *    1.2.15                  13    10215  12.so.0.15[.0]
- *    1.2.16beta1-2           13    10216  12.so.0.16[.0]
- *    1.2.16rc1               13    10216  12.so.0.16[.0]
- *    1.0.24                  10    10024  10.so.0.24[.0]
- *    1.2.16                  13    10216  12.so.0.16[.0]
- *    1.2.17beta1-2           13    10217  12.so.0.17[.0]
- *    1.0.25rc1               10    10025  10.so.0.25[.0]
- *    1.2.17rc1-3             13    10217  12.so.0.17[.0]
- *    1.0.25                  10    10025  10.so.0.25[.0]
- *    1.2.17                  13    10217  12.so.0.17[.0]
- *    1.0.26                  10    10026  10.so.0.26[.0]
- *    1.2.18                  13    10218  12.so.0.18[.0]
- *    1.2.19beta1-31          13    10219  12.so.0.19[.0]
- *    1.0.27rc1-6             10    10027  10.so.0.27[.0]
- *    1.2.19rc1-6             13    10219  12.so.0.19[.0]
- *    1.0.27                  10    10027  10.so.0.27[.0]
- *    1.2.19                  13    10219  12.so.0.19[.0]
- *    1.2.20beta01-04         13    10220  12.so.0.20[.0]
- *    1.0.28rc1-6             10    10028  10.so.0.28[.0]
- *    1.2.20rc1-6             13    10220  12.so.0.20[.0]
- *    1.0.28                  10    10028  10.so.0.28[.0]
- *    1.2.20                  13    10220  12.so.0.20[.0]
- *    1.2.21beta1-2           13    10221  12.so.0.21[.0]
- *    1.2.21rc1-3             13    10221  12.so.0.21[.0]
- *    1.0.29                  10    10029  10.so.0.29[.0]
- *    1.2.21                  13    10221  12.so.0.21[.0]
- *    1.2.22beta1-4           13    10222  12.so.0.22[.0]
- *    1.0.30rc1               10    10030  10.so.0.30[.0]
- *    1.2.22rc1               13    10222  12.so.0.22[.0]
- *    1.0.30                  10    10030  10.so.0.30[.0]
- *    1.2.22                  13    10222  12.so.0.22[.0]
- *    1.2.23beta01-05         13    10223  12.so.0.23[.0]
- *    1.2.23rc01              13    10223  12.so.0.23[.0]
- *    1.2.23                  13    10223  12.so.0.23[.0]
- *    1.2.24beta01-02         13    10224  12.so.0.24[.0]
- *    1.2.24rc01              13    10224  12.so.0.24[.0]
- *    1.2.24                  13    10224  12.so.0.24[.0]
- *    1.2.25beta01-06         13    10225  12.so.0.25[.0]
- *    1.2.25rc01-02           13    10225  12.so.0.25[.0]
- *    1.0.31                  10    10031  10.so.0.31[.0]
- *    1.2.25                  13    10225  12.so.0.25[.0]
- *    1.2.26beta01-06         13    10226  12.so.0.26[.0]
- *    1.2.26rc01              13    10226  12.so.0.26[.0]
- *    1.2.26                  13    10226  12.so.0.26[.0]
- *    1.0.32                  10    10032  10.so.0.32[.0]
- *    1.2.27beta01-06         13    10227  12.so.0.27[.0]
- *    1.2.27rc01              13    10227  12.so.0.27[.0]
- *    1.0.33                  10    10033  10.so.0.33[.0]
- *    1.2.27                  13    10227  12.so.0.27[.0]
- *    1.0.34                  10    10034  10.so.0.34[.0]
- *    1.2.28                  13    10228  12.so.0.28[.0]
- *    1.2.29beta01-03         13    10229  12.so.0.29[.0]
- *    1.2.29rc01              13    10229  12.so.0.29[.0]
- *    1.0.35                  10    10035  10.so.0.35[.0]
- *    1.2.29                  13    10229  12.so.0.29[.0]
- *    1.0.37                  10    10037  10.so.0.37[.0]
- *    1.2.30beta01-04         13    10230  12.so.0.30[.0]
- *    1.0.38rc01-08           10    10038  10.so.0.38[.0]
- *    1.2.30rc01-08           13    10230  12.so.0.30[.0]
- *    1.0.38                  10    10038  10.so.0.38[.0]
- *    1.2.30                  13    10230  12.so.0.30[.0]
- *    1.0.39rc01-03           10    10039  10.so.0.39[.0]
- *    1.2.31rc01-03           13    10231  12.so.0.31[.0]
- *    1.0.39                  10    10039  10.so.0.39[.0]
- *    1.2.31                  13    10231  12.so.0.31[.0]
- *    1.2.32beta01-02         13    10232  12.so.0.32[.0]
- *    1.0.40rc01              10    10040  10.so.0.40[.0]
- *    1.2.32rc01              13    10232  12.so.0.32[.0]
- *    1.0.40                  10    10040  10.so.0.40[.0]
- *    1.2.32                  13    10232  12.so.0.32[.0]
- *    1.2.33beta01-02         13    10233  12.so.0.33[.0]
- *    1.2.33rc01-02           13    10233  12.so.0.33[.0]
- *    1.0.41rc01              10    10041  10.so.0.41[.0]
- *    1.2.33                  13    10233  12.so.0.33[.0]
- *    1.0.41                  10    10041  10.so.0.41[.0]
- *    1.2.34beta01-07         13    10234  12.so.0.34[.0]
- *    1.0.42rc01              10    10042  10.so.0.42[.0]
- *    1.2.34rc01              13    10234  12.so.0.34[.0]
- *    1.0.42                  10    10042  10.so.0.42[.0]
- *    1.2.34                  13    10234  12.so.0.34[.0]
- *
- *    Henceforth the source version will match the shared-library major
- *    and minor numbers; the shared-library major version number will be
- *    used for changes in backward compatibility, as it is intended.  The
- *    PNG_LIBPNG_VER macro, which is not used within libpng but is available
- *    for applications, is an unsigned integer of the form xyyzz corresponding
- *    to the source version x.y.z (leading zeros in y and z).  Beta versions
- *    were given the previous public release number plus a letter, until
- *    version 1.0.6j; from then on they were given the upcoming public
- *    release number plus "betaNN" or "rcNN".
- *
- *    Binary incompatibility exists only when applications make direct access
- *    to the info_ptr or png_ptr members through png.h, and the compiled
- *    application is loaded with a different version of the library.
- *
- *    DLLNUM will change each time there are forward or backward changes
- *    in binary compatibility (e.g., when a new feature is added).
- *
- * See libpng.txt or libpng.3 for more information.  The PNG specification
- * is available as a W3C Recommendation and as an ISO Specification,
- * <http://www.w3.org/TR/2003/REC-PNG-20031110/
+ *    1.4.0beta15-36          14    10400  14.so.0.0[.0]
+ *    1.4.0beta37-87          14    10400  14.so.14.0[.0]
+ *    1.4.0rc01               14    10400  14.so.14.0[.0]
+ *    1.4.0beta88-109         14    10400  14.so.14.0[.0]
+ *    1.4.0rc02-08            14    10400  14.so.14.0[.0]
+ *    1.4.0                   14    10400  14.so.14.0[.0]
+ *    1.4.1beta01-03          14    10401  14.so.14.1[.0]
+ *    1.4.1rc01               14    10401  14.so.14.1[.0]
+ *    1.4.1beta04-12          14    10401  14.so.14.1[.0]
+ *    1.4.1                   14    10401  14.so.14.1[.0]
+ *    1.4.2                   14    10402  14.so.14.2[.0]
+ *    1.4.3                   14    10403  14.so.14.3[.0]
+ *    1.4.4                   14    10404  14.so.14.4[.0]
+ *    1.5.0beta01-58          15    10500  15.so.15.0[.0]
+ *    1.5.0rc01-07            15    10500  15.so.15.0[.0]
+ *    1.5.0                   15    10500  15.so.15.0[.0]
+ *    1.5.1beta01-11          15    10501  15.so.15.1[.0]
+ *    1.5.1rc01-02            15    10501  15.so.15.1[.0]
+ *    1.5.1                   15    10501  15.so.15.1[.0]
+ *    1.5.2beta01-03          15    10502  15.so.15.2[.0]
+ *    1.5.2rc01-03            15    10502  15.so.15.2[.0]
+ *    1.5.2                   15    10502  15.so.15.2[.0]
+ *    1.5.3beta01-10          15    10503  15.so.15.3[.0]
+ *    1.5.3rc01-02            15    10503  15.so.15.3[.0]
+ *    1.5.3beta11             15    10503  15.so.15.3[.0]
+ *    1.5.3 [omitted]
+ *    1.5.4beta01-08          15    10504  15.so.15.4[.0]
+ *    1.5.4rc01               15    10504  15.so.15.4[.0]
+ *    1.5.4                   15    10504  15.so.15.4[.0]
+ *    1.5.5beta01-08          15    10505  15.so.15.5[.0]
+ *    1.5.5rc01               15    10505  15.so.15.5[.0]
+ *    1.5.5                   15    10505  15.so.15.5[.0]
+ *    1.5.6beta01-07          15    10506  15.so.15.6[.0]
+ *    1.5.6rc01-03            15    10506  15.so.15.6[.0]
+ *    1.5.6                   15    10506  15.so.15.6[.0]
+ *    1.5.7beta01-05          15    10507  15.so.15.7[.0]
+ *    1.5.7rc01-03            15    10507  15.so.15.7[.0]
+ *    1.5.7                   15    10507  15.so.15.7[.0]
+ *
+ *   Henceforth the source version will match the shared-library major
+ *   and minor numbers; the shared-library major version number will be
+ *   used for changes in backward compatibility, as it is intended.  The
+ *   PNG_LIBPNG_VER macro, which is not used within libpng but is available
+ *   for applications, is an unsigned integer of the form xyyzz corresponding
+ *   to the source version x.y.z (leading zeros in y and z).  Beta versions
+ *   were given the previous public release number plus a letter, until
+ *   version 1.0.6j; from then on they were given the upcoming public
+ *   release number plus "betaNN" or "rcN".
+ *
+ *   Binary incompatibility exists only when applications make direct access
+ *   to the info_ptr or png_ptr members through png.h, and the compiled
+ *   application is loaded with a different version of the library.
+ *
+ *   DLLNUM will change each time there are forward or backward changes
+ *   in binary compatibility (e.g., when a new feature is added).
+ *
+ * See libpng-manual.txt or libpng.3 for more information.  The PNG
+ * specification is available as a W3C Recommendation and as an ISO
+ * Specification, <http://www.w3.org/TR/2003/REC-PNG-20031110/

  */
 
 /*
  */
 
 /*


@@ -246,8 +195,10 @@
  * If you modify libpng you may insert additional notices immediately following
  * this sentence.
  *
  * If you modify libpng you may insert additional notices immediately following
  * this sentence.
  *

- * libpng versions 1.2.6, August 15, 2004, through 1.2.34, December 18, 2008, are
- * Copyright (c) 2004, 2006-2008 Glenn Randers-Pehrson, and are
+ * This code is released under the libpng license.
+ *
+ * libpng versions 1.2.6, August 15, 2004, through 1.5.7, December 15, 2011, are
+ * Copyright (c) 2004, 2006-2011 Glenn Randers-Pehrson, and are

  * distributed according to the same disclaimer and license as libpng-1.2.5
  * with the following individual added to the list of Contributing Authors:
  *
  * distributed according to the same disclaimer and license as libpng-1.2.5
  * with the following individual added to the list of Contributing Authors:
  *


@@ -316,13 +267,13 @@
  * source code, or portions hereof, for any purpose, without fee, subject
  * to the following restrictions:
  *
  * source code, or portions hereof, for any purpose, without fee, subject
  * to the following restrictions:
  *

- * 1. The origin of this source code must not be misrepresented.
+ *   1. The origin of this source code must not be misrepresented.

  *
  *

- * 2. Altered versions must be plainly marked as such and
- * must not be misrepresented as being the original source.
+ *   2. Altered versions must be plainly marked as such and must not
+ *      be misrepresented as being the original source.

  *
  *

- * 3. This Copyright notice may not be removed or altered from
- *    any source or altered source distribution.
+ *   3. This Copyright notice may not be removed or altered from
+ *      any source or altered source distribution.

  *
  * The Contributing Authors and Group 42, Inc. specifically permit, without
  * fee, and encourage the use of this source code as a component to
  *
  * The Contributing Authors and Group 42, Inc. specifically permit, without
  * fee, and encourage the use of this source code as a component to


@@ -335,7 +286,7 @@
  * A "png_get_copyright" function is available, for convenient use in "about"
  * boxes and the like:
  *
  * A "png_get_copyright" function is available, for convenient use in "about"
  * boxes and the like:
  *

- * printf("%s",png_get_copyright(NULL));
+ *     printf("%s", png_get_copyright(NULL));

  *
  * Also, the PNG logo (in PNG format, of course) is supplied in the
  * files "pngbar.png" and "pngbar.jpg (88x31) and "pngnow.png" (98x31).
  *
  * Also, the PNG logo (in PNG format, of course) is supplied in the
  * files "pngbar.png" and "pngbar.jpg (88x31) and "pngnow.png" (98x31).


@@ -358,25 +309,24 @@
  * Y2K compliance in libpng:
  * =========================
  *
  * Y2K compliance in libpng:
  * =========================
  *

- *    December 18, 2008
+ *    December 15, 2011

  *
  *    Since the PNG Development group is an ad-hoc body, we can't make
  *    an official declaration.
  *
  *    This is your unofficial assurance that libpng from version 0.71 and
  *
  *    Since the PNG Development group is an ad-hoc body, we can't make
  *    an official declaration.
  *
  *    This is your unofficial assurance that libpng from version 0.71 and

- *    upward through 1.2.34 are Y2K compliant.  It is my belief that earlier
- *    versions were also Y2K compliant.
+ *    upward through 1.5.7 are Y2K compliant.  It is my belief that
+ *    earlier versions were also Y2K compliant.

  *
  *

- *    Libpng only has three year fields.  One is a 2-byte unsigned integer
- *    that will hold years up to 65535.  The other two hold the date in text
+ *    Libpng only has two year fields.  One is a 2-byte unsigned integer
+ *    that will hold years up to 65535.  The other holds the date in text

  *    format, and will hold years up to 9999.
  *
  *    The integer is
  *        "png_uint_16 year" in png_time_struct.
  *
  *    format, and will hold years up to 9999.
  *
  *    The integer is
  *        "png_uint_16 year" in png_time_struct.
  *

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

  *
  *    There are seven time-related functions:
  *        png.c: png_convert_to_rfc_1123() in png.c
  *
  *    There are seven time-related functions:
  *        png.c: png_convert_to_rfc_1123() in png.c


@@ -413,26 +363,31 @@
 #ifndef PNG_H
 #define PNG_H
 
 #ifndef PNG_H
 #define PNG_H
 

-/* This is not the place to learn how to use libpng.  The file libpng.txt
+/* This is not the place to learn how to use libpng. The file libpng-manual.txt

  * describes how to use libpng, and the file example.c summarizes it
  * with some code on which to build.  This file is useful for looking
  * at the actual function definitions and structure components.
  * describes how to use libpng, and the file example.c summarizes it
  * with some code on which to build.  This file is useful for looking
  * at the actual function definitions and structure components.

+ *
+ * If you just need to read a PNG file and don't want to read the documentation
+ * skip to the end of this file and read the section entitled 'simplified API'.

  */
 
 /* Version information for png.h - this should match the version in png.c */
  */
 
 /* Version information for png.h - this should match the version in png.c */

-#define PNG_LIBPNG_VER_STRING "1.2.34"
+#define PNG_LIBPNG_VER_STRING "1.5.7"

 #define PNG_HEADER_VERSION_STRING \
 #define PNG_HEADER_VERSION_STRING \

-   " libpng version 1.2.34 - December 18, 2008\n"
+     " libpng version 1.5.7 - December 15, 2011\n"

 
 

-#define PNG_LIBPNG_VER_SONUM   0
-#define PNG_LIBPNG_VER_DLLNUM  13
+#define PNG_LIBPNG_VER_SONUM   15
+#define PNG_LIBPNG_VER_DLLNUM  15

 
 /* These should match the first 3 components of PNG_LIBPNG_VER_STRING: */
 #define PNG_LIBPNG_VER_MAJOR   1
 
 /* These should match the first 3 components of PNG_LIBPNG_VER_STRING: */
 #define PNG_LIBPNG_VER_MAJOR   1

-#define PNG_LIBPNG_VER_MINOR   2
-#define PNG_LIBPNG_VER_RELEASE 34
+#define PNG_LIBPNG_VER_MINOR   5
+#define PNG_LIBPNG_VER_RELEASE 7
+

 /* This should match the numeric part of the final component of
 /* This should match the numeric part of the final component of

- * PNG_LIBPNG_VER_STRING, omitting any leading zero: */
+ * PNG_LIBPNG_VER_STRING, omitting any leading zero:
+ */

 
 #define PNG_LIBPNG_VER_BUILD  0
 
 
 #define PNG_LIBPNG_VER_BUILD  0
 


@@ -442,7 +397,7 @@
 #define PNG_LIBPNG_BUILD_RC       3
 #define PNG_LIBPNG_BUILD_STABLE   4
 #define PNG_LIBPNG_BUILD_RELEASE_STATUS_MASK 7
 #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 */
 /* Release-Specific Flags */
 #define PNG_LIBPNG_BUILD_PATCH    8 /* Can be OR'ed with
                                        PNG_LIBPNG_BUILD_STABLE only */


@@ -451,43 +406,70 @@
 #define PNG_LIBPNG_BUILD_SPECIAL 32 /* Cannot be OR'ed with
                                        PNG_LIBPNG_BUILD_PRIVATE */
 
 #define PNG_LIBPNG_BUILD_SPECIAL 32 /* Cannot be OR'ed with
                                        PNG_LIBPNG_BUILD_PRIVATE */
 

-#define PNG_LIBPNG_BUILD_BASE_TYPE PNG_LIBPNG_BUILD_STABLE
+#define PNG_LIBPNG_BUILD_BASE_TYPE PNG_LIBPNG_BUILD_BETA

 
 /* Careful here.  At one time, Guy wanted to use 082, but that would be octal.
  * We must not include leading zeros.
  * Versions 0.7 through 1.0.0 were in the range 0 to 100 here (only
  * version 1.0.0 was mis-numbered 100 instead of 10000).  From
 
 /* 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 10234 /* 1.2.34 */
+ * version 1.0.1 it's    xxyyzz, where x=major, y=minor, z=release
+ */
+#define PNG_LIBPNG_VER 10507 /* 1.5.7 */

 
 

-#ifndef PNG_VERSION_INFO_ONLY
-/* include the compression library's header */
-#include "zlib.h"
+/* Library configuration: these options cannot be changed after
+ * the library has been built.
+ */
+#ifndef PNGLCONF_H
+    /* If pnglibconf.h is missing, you can
+     * copy scripts/pnglibconf.h.prebuilt to pnglibconf.h
+     */
+#   include "pnglibconf.h"

 #endif
 
 #endif
 

-/* include all user configurable info, including optional assembler routines */
-#include "pngconf.h"
+#ifndef PNG_VERSION_INFO_ONLY
+#  ifndef PNG_BUILDING_SYMBOL_TABLE
+  /*
+   *   Standard header files (not needed for the version info or while
+   *   building symbol table -- see scripts/pnglibconf.dfa)
+   */
+#    ifdef PNG_SETJMP_SUPPORTED
+#      include <setjmp.h>
+#    endif
+
+    /* Need the time information for converting tIME chunks, it
+     * defines struct tm:
+     */
+#    ifdef PNG_CONVERT_tIME_SUPPORTED
+       /* "time.h" functions are not supported on all operating systems */
+#      include <time.h>
+#    endif
+#  endif
+
+/* Machine specific configuration. */
+#  include "pngconf.h"
+#endif

 
 /*
 
 /*

- * Added at libpng-1.2.8 */
-/* Ref MSDN: Private as priority over Special
+ * Added at libpng-1.2.8
+ *
+ * Ref MSDN: Private as priority over Special

  * VS_FF_PRIVATEBUILD File *was not* built using standard release
  * procedures. If this value is given, the StringFileInfo block must
  * VS_FF_PRIVATEBUILD File *was not* built using standard release
  * procedures. If this value is given, the StringFileInfo block must

- * contain a PrivateBuild string. 
+ * 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
  *
  * 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. 
+ * StringFileInfo block must contain a SpecialBuild string.

  */
 
  */
 

-#if defined(PNG_USER_PRIVATEBUILD)
+#ifdef PNG_USER_PRIVATEBUILD /* From pnglibconf.h */

 #  define PNG_LIBPNG_BUILD_TYPE \
 #  define PNG_LIBPNG_BUILD_TYPE \

-          (PNG_LIBPNG_BUILD_BASE_TYPE | PNG_LIBPNG_BUILD_PRIVATE)
+       (PNG_LIBPNG_BUILD_BASE_TYPE | PNG_LIBPNG_BUILD_PRIVATE)

 #else
 #else

-#  if defined(PNG_LIBPNG_SPECIALBUILD)
+#  ifdef PNG_LIBPNG_SPECIALBUILD

 #    define PNG_LIBPNG_BUILD_TYPE \
 #    define PNG_LIBPNG_BUILD_TYPE \

-            (PNG_LIBPNG_BUILD_BASE_TYPE | PNG_LIBPNG_BUILD_SPECIAL)
+         (PNG_LIBPNG_BUILD_BASE_TYPE | PNG_LIBPNG_BUILD_SPECIAL)

 #  else
 #    define PNG_LIBPNG_BUILD_TYPE (PNG_LIBPNG_BUILD_BASE_TYPE)
 #  endif
 #  else
 #    define PNG_LIBPNG_BUILD_TYPE (PNG_LIBPNG_BUILD_BASE_TYPE)
 #  endif


@@ -500,73 +482,61 @@
 extern "C" {
 #endif /* __cplusplus */
 
 extern "C" {
 #endif /* __cplusplus */
 

-/* This file is arranged in several sections.  The first section contains
- * structure and type definitions.  The second section contains the external
- * library functions, while the third has the internal library functions,
- * which applications aren't expected to use directly.
- */
-
-#ifndef PNG_NO_TYPECAST_NULL
-#define int_p_NULL                (int *)NULL
-#define png_bytep_NULL            (png_bytep)NULL
-#define png_bytepp_NULL           (png_bytepp)NULL
-#define png_doublep_NULL          (png_doublep)NULL
-#define png_error_ptr_NULL        (png_error_ptr)NULL
-#define png_flush_ptr_NULL        (png_flush_ptr)NULL
-#define png_free_ptr_NULL         (png_free_ptr)NULL
-#define png_infopp_NULL           (png_infopp)NULL
-#define png_malloc_ptr_NULL       (png_malloc_ptr)NULL
-#define png_read_status_ptr_NULL  (png_read_status_ptr)NULL
-#define png_rw_ptr_NULL           (png_rw_ptr)NULL
-#define png_structp_NULL          (png_structp)NULL
-#define png_uint_16p_NULL         (png_uint_16p)NULL
-#define png_voidp_NULL            (png_voidp)NULL
-#define png_write_status_ptr_NULL (png_write_status_ptr)NULL
-#else
-#define int_p_NULL                NULL
-#define png_bytep_NULL            NULL
-#define png_bytepp_NULL           NULL
-#define png_doublep_NULL          NULL
-#define png_error_ptr_NULL        NULL
-#define png_flush_ptr_NULL        NULL
-#define png_free_ptr_NULL         NULL
-#define png_infopp_NULL           NULL
-#define png_malloc_ptr_NULL       NULL
-#define png_read_status_ptr_NULL  NULL
-#define png_rw_ptr_NULL           NULL
-#define png_structp_NULL          NULL
-#define png_uint_16p_NULL         NULL
-#define png_voidp_NULL            NULL
-#define png_write_status_ptr_NULL NULL
-#endif
-
-/* variables declared in png.c - only it needs to define PNG_NO_EXTERN */
-#if !defined(PNG_NO_EXTERN) || defined(PNG_ALWAYS_EXTERN)

 /* Version information for C files, stored in png.c.  This had better match
  * the version above.
  */
 /* Version information for C files, stored in png.c.  This had better match
  * the version above.
  */

-#ifdef PNG_USE_GLOBAL_ARRAYS
-PNG_EXPORT_VAR (PNG_CONST char) png_libpng_ver[18];
-  /* need room for 99.99.99beta99z */
-#else

 #define png_libpng_ver png_get_header_ver(NULL)
 #define png_libpng_ver png_get_header_ver(NULL)

-#endif

 
 

-#ifdef PNG_USE_GLOBAL_ARRAYS
-/* This was removed in version 1.0.5c */
-/* Structures to facilitate easy interlacing.  See png.c for more details */
-PNG_EXPORT_VAR (PNG_CONST int FARDATA) png_pass_start[7];
-PNG_EXPORT_VAR (PNG_CONST int FARDATA) png_pass_inc[7];
-PNG_EXPORT_VAR (PNG_CONST int FARDATA) png_pass_ystart[7];
-PNG_EXPORT_VAR (PNG_CONST int FARDATA) png_pass_yinc[7];
-PNG_EXPORT_VAR (PNG_CONST int FARDATA) png_pass_mask[7];
-PNG_EXPORT_VAR (PNG_CONST int FARDATA) png_pass_dsp_mask[7];
-/* This isn't currently used.  If you need it, see png.c for more details.
-PNG_EXPORT_VAR (PNG_CONST int FARDATA) png_pass_height[7];
-*/
-#endif
+/* This file is arranged in several sections:
+ *
+ * 1. Any configuration options that can be specified by for the application
+ *    code when it is built.  (Build time configuration is in pnglibconf.h)
+ * 2. Type definitions (base types are defined in pngconf.h), structure
+ *    definitions.
+ * 3. Exported library functions.
+ *
+ * The library source code has additional files (principally pngpriv.h) that
+ * allow configuration of the library.
+ */
+/* Section 1: run time configuration
+ * See pnglibconf.h for build time configuration
+ *
+ * Run time configuration allows the application to choose between
+ * implementations of certain arithmetic APIs.  The default is set
+ * at build time and recorded in pnglibconf.h, but it is safe to
+ * override these (and only these) settings.  Note that this won't
+ * change what the library does, only application code, and the
+ * settings can (and probably should) be made on a per-file basis
+ * by setting the #defines before including png.h
+ *
+ * Use macros to read integers from PNG data or use the exported
+ * functions?
+ *   PNG_USE_READ_MACROS: use the macros (see below)  Note that
+ *     the macros evaluate their argument multiple times.
+ *   PNG_NO_USE_READ_MACROS: call the relevant library function.
+ *
+ * Use the alternative algorithm for compositing alpha samples that
+ * does not use division?
+ *   PNG_READ_COMPOSITE_NODIV_SUPPORTED: use the 'no division'
+ *      algorithm.
+ *   PNG_NO_READ_COMPOSITE_NODIV: use the 'division' algorithm.
+ *
+ * How to handle benign errors if PNG_ALLOW_BENIGN_ERRORS is
+ * false?
+ *   PNG_ALLOW_BENIGN_ERRORS: map calls to the benign error
+ *      APIs to png_warning.
+ * Otherwise the calls are mapped to png_error.
+ */
+
+/* Section 2: type definitions, including structures and compile time
+ * constants.
+ * See pngconf.h for base types that vary by machine/system
+ */

 
 

-#endif /* PNG_NO_EXTERN */
+/* This triggers a compiler error in png.c, if png.c and png.h
+ * do not agree upon the version number.
+ */
+typedef char* png_libpng_version_1_5_7;

 
 /* Three color definitions.  The order of the red, green, and blue, (and the
  * exact size) is not important, although the size of the fields need to
 
 /* Three color definitions.  The order of the red, green, and blue, (and the
  * exact size) is not important, although the size of the fields need to


@@ -579,6 +549,7 @@ typedef struct png_color_struct
    png_byte blue;
 } png_color;
 typedef png_color FAR * png_colorp;
    png_byte blue;
 } png_color;
 typedef png_color FAR * png_colorp;

+typedef PNG_CONST png_color FAR * png_const_colorp;

 typedef png_color FAR * FAR * png_colorpp;
 
 typedef struct png_color_16_struct
 typedef png_color FAR * FAR * png_colorpp;
 
 typedef struct png_color_16_struct


@@ -590,6 +561,7 @@ typedef struct png_color_16_struct
    png_uint_16 gray;  /* for use in grayscale files */
 } png_color_16;
 typedef png_color_16 FAR * png_color_16p;
    png_uint_16 gray;  /* for use in grayscale files */
 } png_color_16;
 typedef png_color_16 FAR * png_color_16p;

+typedef PNG_CONST png_color_16 FAR * png_const_color_16p;

 typedef png_color_16 FAR * FAR * png_color_16pp;
 
 typedef struct png_color_8_struct
 typedef png_color_16 FAR * FAR * png_color_16pp;
 
 typedef struct png_color_8_struct


@@ -601,6 +573,7 @@ typedef struct png_color_8_struct
    png_byte alpha; /* for alpha channel files */
 } png_color_8;
 typedef png_color_8 FAR * png_color_8p;
    png_byte alpha; /* for alpha channel files */
 } png_color_8;
 typedef png_color_8 FAR * png_color_8p;

+typedef PNG_CONST png_color_8 FAR * png_const_color_8p;

 typedef png_color_8 FAR * FAR * png_color_8pp;
 
 /*
 typedef png_color_8 FAR * FAR * png_color_8pp;
 
 /*


@@ -616,6 +589,7 @@ typedef struct png_sPLT_entry_struct
    png_uint_16 frequency;
 } png_sPLT_entry;
 typedef png_sPLT_entry FAR * png_sPLT_entryp;
    png_uint_16 frequency;
 } png_sPLT_entry;
 typedef png_sPLT_entry FAR * png_sPLT_entryp;

+typedef PNG_CONST png_sPLT_entry FAR * png_const_sPLT_entryp;

 typedef png_sPLT_entry FAR * FAR * png_sPLT_entrypp;
 
 /*  When the depth of the sPLT palette is 8 bits, the color and alpha samples
 typedef png_sPLT_entry FAR * FAR * png_sPLT_entrypp;
 
 /*  When the depth of the sPLT palette is 8 bits, the color and alpha samples


@@ -631,16 +605,26 @@ typedef struct png_sPLT_struct
    png_int_32 nentries;      /* number of palette entries */
 } png_sPLT_t;
 typedef png_sPLT_t FAR * png_sPLT_tp;
    png_int_32 nentries;      /* number of palette entries */
 } png_sPLT_t;
 typedef png_sPLT_t FAR * png_sPLT_tp;

+typedef PNG_CONST png_sPLT_t FAR * png_const_sPLT_tp;

 typedef png_sPLT_t FAR * FAR * png_sPLT_tpp;
 
 #ifdef PNG_TEXT_SUPPORTED
 /* 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
 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.
+ * points to a regular zero-terminated C string.  The "text" fields can be a
+ * regular C string, an empty string, or a NULL pointer.
+ * However, the structure returned by png_get_text() will always contain
+ * the "text" field as a regular zero-terminated C string (possibly
+ * empty), never a NULL pointer, so it can be safely used in printf() and
+ * other string-handling functions.  Note that the "itxt_length", "lang", and
+ * "lang_key" members of the structure only exist when the library is built
+ * with iTXt chunk support.  Prior to libpng-1.4.0 the library was built by
+ * default without iTXt support. Also note that when iTXt *is* supported,
+ * the "lang" and "lang_key" fields contain NULL pointers when the
+ * "compression" field contains * PNG_TEXT_COMPRESSION_NONE or
+ * PNG_TEXT_COMPRESSION_zTXt. Note that the "compression value" is not the
+ * same as what appears in the PNG tEXt/zTXt/iTXt chunk's "compression flag"
+ * which is always 0 or 1, or its "compression method" which is always 0.

  */
 typedef struct png_text_struct
 {
  */
 typedef struct png_text_struct
 {


@@ -653,15 +637,14 @@ typedef struct png_text_struct
    png_charp text;         /* comment, may be an empty string (ie "")
                               or a NULL pointer */
    png_size_t text_length; /* length of the text string */
    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 */
    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;
 } png_text;
 typedef png_text FAR * png_textp;

+typedef PNG_CONST png_text FAR * png_const_textp;

 typedef png_text FAR * FAR * png_textpp;
 #endif
 
 typedef png_text FAR * FAR * png_textpp;
 #endif
 


@@ -691,317 +674,60 @@ typedef struct png_time_struct
    png_byte second;  /* second of minute, 0 - 60 (for leap seconds) */
 } png_time;
 typedef png_time FAR * png_timep;
    png_byte second;  /* second of minute, 0 - 60 (for leap seconds) */
 } png_time;
 typedef png_time FAR * png_timep;

+typedef PNG_CONST png_time FAR * png_const_timep;

 typedef png_time FAR * FAR * png_timepp;
 
 typedef png_time FAR * FAR * png_timepp;
 

-#if defined(PNG_UNKNOWN_CHUNKS_SUPPORTED)
+#if defined(PNG_UNKNOWN_CHUNKS_SUPPORTED) || \
+    defined(PNG_HANDLE_AS_UNKNOWN_SUPPORTED)

 /* png_unknown_chunk is a structure to hold queued chunks for which there is
  * no specific support.  The idea is that we can use this to queue
  * up private chunks for output even though the library doesn't actually
  * know about their semantics.
  */
 /* png_unknown_chunk is a structure to hold queued chunks for which there is
  * no specific support.  The idea is that we can use this to queue
  * up private chunks for output even though the library doesn't actually
  * know about their semantics.
  */

-#define PNG_CHUNK_NAME_LENGTH 5

 typedef struct png_unknown_chunk_t
 {
 typedef struct png_unknown_chunk_t
 {

-    png_byte name[PNG_CHUNK_NAME_LENGTH];
+    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_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;
 png_unknown_chunk;
 typedef png_unknown_chunk FAR * png_unknown_chunkp;

+typedef PNG_CONST png_unknown_chunk FAR * png_const_unknown_chunkp;

 typedef png_unknown_chunk FAR * FAR * png_unknown_chunkpp;
 #endif
 
 typedef png_unknown_chunk FAR * FAR * png_unknown_chunkpp;
 #endif
 

-/* png_info is a structure that holds the information in a PNG file so
- * that the application can find out the characteristics of the image.
- * If you are reading the file, this structure will tell you what is
- * in the PNG file.  If you are writing the file, fill in the information
- * you want to put into the PNG file, then call png_write_info().
- * The names chosen should be very close to the PNG specification, so
- * consult that document for information about the meaning of each field.
- *
- * With libpng < 0.95, it was only possible to directly set and read the
- * the values in the png_info_struct, which meant that the contents and
- * order of the values had to remain fixed.  With libpng 0.95 and later,
- * however, there are now functions that abstract the contents of
- * png_info_struct from the application, so this makes it easier to use
- * libpng with dynamic libraries, and even makes it possible to use
- * libraries that don't have all of the libpng ancillary chunk-handing
- * functionality.
- *
- * In any case, the order of the parameters in png_info_struct should NOT
- * be changed for as long as possible to keep compatibility with applications
- * that use the old direct-access method with png_info_struct.
- *
- * The following members may have allocated storage attached that should be
- * cleaned up before the structure is discarded: palette, trans, text,
- * pcal_purpose, pcal_units, pcal_params, hist, iccp_name, iccp_profile,
- * splt_palettes, scal_unit, row_pointers, and unknowns.   By default, these
- * are automatically freed when the info structure is deallocated, if they were
- * allocated internally by libpng.  This behavior can be changed by means
- * of the png_data_freer() function.
- *
- * More allocation details: all the chunk-reading functions that
- * change these members go through the corresponding png_set_*
- * functions.  A function to clear these members is available: see
- * png_free_data().  The png_set_* functions do not depend on being
- * able to point info structure members to any of the storage they are
- * passed (they make their own copies), EXCEPT that the png_set_text
- * functions use the same storage passed to them in the text_ptr or
- * itxt_ptr structure argument, and the png_set_rows and png_set_unknowns
- * functions do not make their own copies.
- */
-typedef struct png_info_struct
-{
-   /* the following are necessary for every PNG file */
-   png_uint_32 width;       /* width of image in pixels (from IHDR) */
-   png_uint_32 height;      /* height of image in pixels (from IHDR) */
-   png_uint_32 valid;       /* valid chunk data (see PNG_INFO_ below) */
-   png_uint_32 rowbytes;    /* bytes needed to hold an untransformed row */
-   png_colorp palette;      /* array of color values (valid & PNG_INFO_PLTE) */
-   png_uint_16 num_palette; /* number of color entries in "palette" (PLTE) */
-   png_uint_16 num_trans;   /* number of transparent palette color (tRNS) */
-   png_byte bit_depth;      /* 1, 2, 4, 8, or 16 bits/channel (from IHDR) */
-   png_byte color_type;     /* see PNG_COLOR_TYPE_ below (from IHDR) */
-   /* The following three should have been named *_method not *_type */
-   png_byte compression_type; /* must be PNG_COMPRESSION_TYPE_BASE (IHDR) */
-   png_byte filter_type;    /* must be PNG_FILTER_TYPE_BASE (from IHDR) */
-   png_byte interlace_type; /* One of PNG_INTERLACE_NONE, PNG_INTERLACE_ADAM7 */
-
-   /* The following is informational only on read, and not used on writes. */
-   png_byte channels;       /* number of data channels per pixel (1, 2, 3, 4) */
-   png_byte pixel_depth;    /* number of bits per pixel */
-   png_byte spare_byte;     /* to align the data, and for future use */
-   png_byte signature[8];   /* magic bytes read by libpng from start of file */
-
-   /* The rest of the data is optional.  If you are reading, check the
-    * valid field to see if the information in these are valid.  If you
-    * are writing, set the valid field to those chunks you want written,
-    * and initialize the appropriate fields below.
-    */
-
-#if defined(PNG_gAMA_SUPPORTED) && defined(PNG_FLOATING_POINT_SUPPORTED)
-   /* The gAMA chunk describes the gamma characteristics of the system
-    * on which the image was created, normally in the range [1.0, 2.5].
-    * Data is valid if (valid & PNG_INFO_gAMA) is non-zero.
-    */
-   float gamma; /* gamma value of image, if (valid & PNG_INFO_gAMA) */
-#endif
-
-#if defined(PNG_sRGB_SUPPORTED)
-    /* GR-P, 0.96a */
-    /* Data valid if (valid & PNG_INFO_sRGB) non-zero. */
-   png_byte srgb_intent; /* sRGB rendering intent [0, 1, 2, or 3] */
-#endif
-
-#if defined(PNG_TEXT_SUPPORTED)
-   /* The tEXt, and zTXt chunks contain human-readable textual data in
-    * uncompressed, compressed, and optionally compressed forms, respectively.
-    * The data in "text" is an array of pointers to uncompressed,
-    * null-terminated C strings. Each chunk has a keyword that describes the
-    * textual data contained in that chunk.  Keywords are not required to be
-    * unique, and the text string may be empty.  Any number of text chunks may
-    * be in an image.
-    */
-   int num_text; /* number of comments read/to write */
-   int max_text; /* current size of text array */
-   png_textp text; /* array of comments read/to write */
-#endif /* PNG_TEXT_SUPPORTED */
-
-#if defined(PNG_tIME_SUPPORTED)
-   /* The tIME chunk holds the last time the displayed image data was
-    * modified.  See the png_time struct for the contents of this struct.
-    */
-   png_time mod_time;
-#endif
-
-#if defined(PNG_sBIT_SUPPORTED)
-   /* The sBIT chunk specifies the number of significant high-order bits
-    * in the pixel data.  Values are in the range [1, bit_depth], and are
-    * only specified for the channels in the pixel data.  The contents of
-    * the low-order bits is not specified.  Data is valid if
-    * (valid & PNG_INFO_sBIT) is non-zero.
-    */
-   png_color_8 sig_bit; /* significant bits in color channels */
-#endif
-
-#if defined(PNG_tRNS_SUPPORTED) || defined(PNG_READ_EXPAND_SUPPORTED) || \
-defined(PNG_READ_BACKGROUND_SUPPORTED)
-   /* The tRNS chunk supplies transparency data for paletted images and
-    * other image types that don't need a full alpha channel.  There are
-    * "num_trans" transparency values for a paletted image, stored in the
-    * same order as the palette colors, starting from index 0.  Values
-    * for the data are in the range [0, 255], ranging from fully transparent
-    * to fully opaque, respectively.  For non-paletted images, there is a
-    * single color specified that should be treated as fully transparent.
-    * Data is valid if (valid & PNG_INFO_tRNS) is non-zero.
-    */
-   png_bytep trans; /* transparent values for paletted image */
-   png_color_16 trans_values; /* transparent color for non-palette image */
-#endif
-
-#if defined(PNG_bKGD_SUPPORTED) || defined(PNG_READ_BACKGROUND_SUPPORTED)
-   /* The bKGD chunk gives the suggested image background color if the
-    * display program does not have its own background color and the image
-    * is needs to composited onto a background before display.  The colors
-    * in "background" are normally in the same color space/depth as the
-    * pixel data.  Data is valid if (valid & PNG_INFO_bKGD) is non-zero.
-    */
-   png_color_16 background;
-#endif
-
-#if defined(PNG_oFFs_SUPPORTED)
-   /* The oFFs chunk gives the offset in "offset_unit_type" units rightwards
-    * and downwards from the top-left corner of the display, page, or other
-    * application-specific co-ordinate space.  See the PNG_OFFSET_ defines
-    * below for the unit types.  Valid if (valid & PNG_INFO_oFFs) non-zero.
-    */
-   png_int_32 x_offset; /* x offset on page */
-   png_int_32 y_offset; /* y offset on page */
-   png_byte offset_unit_type; /* offset units type */
-#endif
-
-#if defined(PNG_pHYs_SUPPORTED)
-   /* The pHYs chunk gives the physical pixel density of the image for
-    * display or printing in "phys_unit_type" units (see PNG_RESOLUTION_
-    * defines below).  Data is valid if (valid & PNG_INFO_pHYs) is non-zero.
-    */
-   png_uint_32 x_pixels_per_unit; /* horizontal pixel density */
-   png_uint_32 y_pixels_per_unit; /* vertical pixel density */
-   png_byte phys_unit_type; /* resolution type (see PNG_RESOLUTION_ below) */
-#endif
-
-#if defined(PNG_hIST_SUPPORTED)
-   /* The hIST chunk contains the relative frequency or importance of the
-    * various palette entries, so that a viewer can intelligently select a
-    * reduced-color palette, if required.  Data is an array of "num_palette"
-    * values in the range [0,65535]. Data valid if (valid & PNG_INFO_hIST)
-    * is non-zero.
-    */
-   png_uint_16p hist;
-#endif
-
-#ifdef PNG_cHRM_SUPPORTED
-   /* The cHRM chunk describes the CIE color characteristics of the monitor
-    * on which the PNG was created.  This data allows the viewer to do gamut
-    * mapping of the input image to ensure that the viewer sees the same
-    * colors in the image as the creator.  Values are in the range
-    * [0.0, 0.8].  Data valid if (valid & PNG_INFO_cHRM) non-zero.
-    */
-#ifdef PNG_FLOATING_POINT_SUPPORTED
-   float x_white;
-   float y_white;
-   float x_red;
-   float y_red;
-   float x_green;
-   float y_green;
-   float x_blue;
-   float y_blue;
-#endif
-#endif
-
-#if defined(PNG_pCAL_SUPPORTED)
-   /* The pCAL chunk describes a transformation between the stored pixel
-    * values and original physical data values used to create the image.
-    * The integer range [0, 2^bit_depth - 1] maps to the floating-point
-    * range given by [pcal_X0, pcal_X1], and are further transformed by a
-    * (possibly non-linear) transformation function given by "pcal_type"
-    * and "pcal_params" into "pcal_units".  Please see the PNG_EQUATION_
-    * defines below, and the PNG-Group's PNG extensions document for a
-    * complete description of the transformations and how they should be
-    * implemented, and for a description of the ASCII parameter strings.
-    * Data values are valid if (valid & PNG_INFO_pCAL) non-zero.
-    */
-   png_charp pcal_purpose;  /* pCAL chunk description string */
-   png_int_32 pcal_X0;      /* minimum value */
-   png_int_32 pcal_X1;      /* maximum value */
-   png_charp pcal_units;    /* Latin-1 string giving physical units */
-   png_charpp pcal_params;  /* ASCII strings containing parameter values */
-   png_byte pcal_type;      /* equation type (see PNG_EQUATION_ below) */
-   png_byte pcal_nparams;   /* number of parameters given in pcal_params */
-#endif
-
-/* New members added in libpng-1.0.6 */
-#ifdef PNG_FREE_ME_SUPPORTED
-   png_uint_32 free_me;     /* flags items libpng is responsible for freeing */
-#endif
-
-#if defined(PNG_UNKNOWN_CHUNKS_SUPPORTED)
-   /* storage for unknown chunks that the library doesn't recognize. */
-   png_unknown_chunkp unknown_chunks;
-   png_size_t unknown_chunks_num;
-#endif
-
-#if defined(PNG_iCCP_SUPPORTED)
-   /* iCCP chunk data. */
-   png_charp iccp_name;     /* profile name */
-   png_charp iccp_profile;  /* International Color Consortium profile data */
-                            /* Note to maintainer: should be png_bytep */
-   png_uint_32 iccp_proflen;  /* ICC profile data length */
-   png_byte iccp_compression; /* Always zero */
-#endif
-
-#if defined(PNG_sPLT_SUPPORTED)
-   /* data on sPLT chunks (there may be more than one). */
-   png_sPLT_tp splt_palettes;
-   png_uint_32 splt_palettes_num;
-#endif
-
-#if defined(PNG_sCAL_SUPPORTED)
-   /* The sCAL chunk describes the actual physical dimensions of the
-    * subject matter of the graphic.  The chunk contains a unit specification
-    * a byte value, and two ASCII strings representing floating-point
-    * values.  The values are width and height corresponsing to one pixel
-    * in the image.  This external representation is converted to double
-    * here.  Data values are valid if (valid & PNG_INFO_sCAL) is non-zero.
-    */
-   png_byte scal_unit;         /* unit of physical scale */
-#ifdef PNG_FLOATING_POINT_SUPPORTED
-   double scal_pixel_width;    /* width of one pixel */
-   double scal_pixel_height;   /* height of one pixel */
-#endif
-#ifdef PNG_FIXED_POINT_SUPPORTED
-   png_charp scal_s_width;     /* string containing height */
-   png_charp scal_s_height;    /* string containing width */
-#endif
-#endif
+/* Values for the unknown chunk location byte */

 
 

-#if defined(PNG_INFO_IMAGE_SUPPORTED)
-   /* Memory has been allocated if (valid & PNG_ALLOCATED_INFO_ROWS) non-zero */
-   /* Data valid if (valid & PNG_INFO_IDAT) non-zero */
-   png_bytepp row_pointers;        /* the image bits */
-#endif
-
-#if defined(PNG_FIXED_POINT_SUPPORTED) && defined(PNG_gAMA_SUPPORTED)
-   png_fixed_point int_gamma; /* gamma of image, if (valid & PNG_INFO_gAMA) */
-#endif
-
-#if defined(PNG_cHRM_SUPPORTED) && defined(PNG_FIXED_POINT_SUPPORTED)
-   png_fixed_point int_x_white;
-   png_fixed_point int_y_white;
-   png_fixed_point int_x_red;
-   png_fixed_point int_y_red;
-   png_fixed_point int_x_green;
-   png_fixed_point int_y_green;
-   png_fixed_point int_x_blue;
-   png_fixed_point int_y_blue;
-#endif
-
-} png_info;
+#define PNG_HAVE_IHDR  0x01
+#define PNG_HAVE_PLTE  0x02
+#define PNG_AFTER_IDAT 0x08

 
 

+/* The complete definition of png_info has, as of libpng-1.5.0,
+ * been moved into a separate header file that is not accessible to
+ * applications.  Read libpng-manual.txt or libpng.3 for more info.
+ */
+typedef struct png_info_def png_info;

 typedef png_info FAR * png_infop;
 typedef png_info FAR * png_infop;

+typedef PNG_CONST png_info FAR * png_const_infop;

 typedef png_info FAR * FAR * png_infopp;
 
 /* Maximum positive integer used in PNG is (2^31)-1 */
 #define PNG_UINT_31_MAX ((png_uint_32)0x7fffffffL)
 #define PNG_UINT_32_MAX ((png_uint_32)(-1))
 #define PNG_SIZE_MAX ((png_size_t)(-1))
 typedef png_info FAR * FAR * png_infopp;
 
 /* Maximum positive integer used in PNG is (2^31)-1 */
 #define PNG_UINT_31_MAX ((png_uint_32)0x7fffffffL)
 #define PNG_UINT_32_MAX ((png_uint_32)(-1))
 #define PNG_SIZE_MAX ((png_size_t)(-1))

-#if defined(PNG_1_0_X) || defined (PNG_1_2_X)
-/* PNG_MAX_UINT is deprecated; use PNG_UINT_31_MAX instead. */
-#define PNG_MAX_UINT PNG_UINT_31_MAX
-#endif
+
+/* These are constants for fixed point values encoded in the
+ * PNG specification manner (x100000)
+ */
+#define PNG_FP_1    100000
+#define PNG_FP_HALF  50000
+#define PNG_FP_MAX  ((png_fixed_point)0x7fffffffL)
+#define PNG_FP_MIN  (-PNG_FP_MAX)

 
 /* These describe the color_type field in png_info. */
 /* color type masks */
 
 /* These describe the color_type field in png_info. */
 /* color type masks */


@@ -1089,7 +815,7 @@ typedef png_info FAR * FAR * png_infopp;
 #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_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 */
+#define PNG_INFO_IDAT 0x8000   /* 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


@@ -1097,53 +823,86 @@ typedef png_info FAR * FAR * png_infopp;
  */
 typedef struct png_row_info_struct
 {
  */
 typedef struct png_row_info_struct
 {

-   png_uint_32 width; /* width of row */
-   png_uint_32 rowbytes; /* number of bytes in row */
-   png_byte color_type; /* color type of row */
-   png_byte bit_depth; /* bit depth of row */
-   png_byte channels; /* number of channels (1, 2, 3, or 4) */
+   png_uint_32 width;    /* width of row */
+   png_size_t rowbytes;  /* number of bytes in row */
+   png_byte color_type;  /* color type of row */
+   png_byte bit_depth;   /* bit depth of row */
+   png_byte channels;    /* number of channels (1, 2, 3, or 4) */

    png_byte pixel_depth; /* bits per pixel (depth * channels) */
 } png_row_info;
 
 typedef png_row_info FAR * png_row_infop;
 typedef png_row_info FAR * FAR * png_row_infopp;
 
    png_byte pixel_depth; /* bits per pixel (depth * channels) */
 } png_row_info;
 
 typedef png_row_info FAR * png_row_infop;
 typedef png_row_info FAR * FAR * png_row_infopp;
 

+/* The complete definition of png_struct has, as of libpng-1.5.0,
+ * been moved into a separate header file that is not accessible to
+ * applications.  Read libpng-manual.txt or libpng.3 for more info.
+ */
+typedef struct png_struct_def png_struct;
+typedef PNG_CONST png_struct FAR * png_const_structp;
+typedef png_struct FAR * png_structp;
+

 /* These are the function types for the I/O functions and for the functions
  * that allow the user to override the default I/O functions with his or her
  * own.  The png_error_ptr type should match that of user-supplied warning
  * and error functions, while the png_rw_ptr type should match that of the
 /* These are the function types for the I/O functions and for the functions
  * that allow the user to override the default I/O functions with his or her
  * own.  The png_error_ptr type should match that of user-supplied warning
  * and error functions, while the png_rw_ptr type should match that of the

- * user read/write data functions.
+ * user read/write data functions.  Note that the 'write' function must not
+ * modify the buffer it is passed. The 'read' function, on the other hand, is
+ * expected to return the read data in the buffer.

  */
  */

-typedef struct png_struct_def png_struct;
-typedef png_struct FAR * png_structp;
-
-typedef void (PNGAPI *png_error_ptr) PNGARG((png_structp, png_const_charp));
-typedef void (PNGAPI *png_rw_ptr) PNGARG((png_structp, png_bytep, png_size_t));
-typedef void (PNGAPI *png_flush_ptr) PNGARG((png_structp));
-typedef void (PNGAPI *png_read_status_ptr) PNGARG((png_structp, png_uint_32,
-   int));
-typedef void (PNGAPI *png_write_status_ptr) PNGARG((png_structp, png_uint_32,
-   int));
+typedef PNG_CALLBACK(void, *png_error_ptr, (png_structp, png_const_charp));
+typedef PNG_CALLBACK(void, *png_rw_ptr, (png_structp, png_bytep, png_size_t));
+typedef PNG_CALLBACK(void, *png_flush_ptr, (png_structp));
+typedef PNG_CALLBACK(void, *png_read_status_ptr, (png_structp, png_uint_32,
+    int));
+typedef PNG_CALLBACK(void, *png_write_status_ptr, (png_structp, png_uint_32,
+    int));

 
 #ifdef PNG_PROGRESSIVE_READ_SUPPORTED
 
 #ifdef PNG_PROGRESSIVE_READ_SUPPORTED

-typedef void (PNGAPI *png_progressive_info_ptr) PNGARG((png_structp, png_infop));
-typedef void (PNGAPI *png_progressive_end_ptr) PNGARG((png_structp, png_infop));
-typedef void (PNGAPI *png_progressive_row_ptr) PNGARG((png_structp, png_bytep,
-   png_uint_32, int));
+typedef PNG_CALLBACK(void, *png_progressive_info_ptr, (png_structp, png_infop));
+typedef PNG_CALLBACK(void, *png_progressive_end_ptr, (png_structp, png_infop));
+
+/* The following callback receives png_uint_32 row_number, int pass for the
+ * png_bytep data of the row.  When transforming an interlaced image the
+ * row number is the row number within the sub-image of the interlace pass, so
+ * the value will increase to the height of the sub-image (not the full image)
+ * then reset to 0 for the next pass.
+ *
+ * Use PNG_ROW_FROM_PASS_ROW(row, pass) and PNG_COL_FROM_PASS_COL(col, pass) to
+ * find the output pixel (x,y) given an interlaced sub-image pixel
+ * (row,col,pass).  (See below for these macros.)
+ */
+typedef PNG_CALLBACK(void, *png_progressive_row_ptr, (png_structp, png_bytep,
+    png_uint_32, int));

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

-    defined(PNG_WRITE_USER_TRANSFORM_SUPPORTED) || \
-    defined(PNG_LEGACY_SUPPORTED)
-typedef void (PNGAPI *png_user_transform_ptr) PNGARG((png_structp,
-    png_row_infop, png_bytep));
+    defined(PNG_WRITE_USER_TRANSFORM_SUPPORTED)
+typedef PNG_CALLBACK(void, *png_user_transform_ptr, (png_structp, png_row_infop,
+    png_bytep));

 #endif
 
 #endif
 

-#if defined(PNG_USER_CHUNKS_SUPPORTED)
-typedef int (PNGAPI *png_user_chunk_ptr) PNGARG((png_structp, png_unknown_chunkp));
+#ifdef PNG_USER_CHUNKS_SUPPORTED
+typedef PNG_CALLBACK(int, *png_user_chunk_ptr, (png_structp,
+    png_unknown_chunkp));
+#endif
+#ifdef PNG_UNKNOWN_CHUNKS_SUPPORTED
+typedef PNG_CALLBACK(void, *png_unknown_chunk_ptr, (png_structp));

 #endif
 #endif

-#if defined(PNG_UNKNOWN_CHUNKS_SUPPORTED)
-typedef void (PNGAPI *png_unknown_chunk_ptr) PNGARG((png_structp));
+
+#ifdef PNG_SETJMP_SUPPORTED
+/* This must match the function definition in <setjmp.h>, and the application
+ * must include this before png.h to obtain the definition of jmp_buf.  The
+ * function is required to be PNG_NORETURN, but this is not checked.  If the
+ * function does return the application will crash via an abort() or similar
+ * system level call.
+ *
+ * If you get a warning here while building the library you may need to make
+ * changes to ensure that pnglibconf.h records the calling convention used by
+ * your compiler.  This may be very difficult - try using a different compiler
+ * to build the library!
+ */
+PNG_FUNCTION(void, (PNGCAPI *png_longjmp_ptr), PNGARG((jmp_buf, int)), typedef);

 #endif
 
 /* Transform masks for the high-level interface */
 #endif
 
 /* Transform masks for the high-level interface */


@@ -1159,678 +918,658 @@ typedef void (PNGAPI *png_unknown_chunk_ptr) PNGARG((png_structp));
 #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_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, deprecated */
+#define PNG_TRANSFORM_STRIP_FILLER   0x0800    /* write only */

 /* Added to libpng-1.2.34 */
 /* Added to libpng-1.2.34 */

-#define PNG_TRANSFORM_STRIP_FILLER_BEFORE 0x0800  /* WRITE only */
-#define PNG_TRANSFORM_STRIP_FILLER_AFTER  0x1000  /* WRITE only */
+#define PNG_TRANSFORM_STRIP_FILLER_BEFORE PNG_TRANSFORM_STRIP_FILLER
+#define PNG_TRANSFORM_STRIP_FILLER_AFTER 0x1000 /* write only */
+/* Added to libpng-1.4.0 */
+#define PNG_TRANSFORM_GRAY_TO_RGB   0x2000      /* read only */
+/* Added to libpng-1.5.4 */
+#define PNG_TRANSFORM_EXPAND_16     0x4000      /* read only */
+#define PNG_TRANSFORM_SCALE_16      0x8000      /* read only */

 
 /* Flags for MNG supported features */
 #define PNG_FLAG_MNG_EMPTY_PLTE     0x01
 #define PNG_FLAG_MNG_FILTER_64      0x04
 #define PNG_ALL_MNG_FEATURES        0x05
 
 
 /* Flags for MNG supported features */
 #define PNG_FLAG_MNG_EMPTY_PLTE     0x01
 #define PNG_FLAG_MNG_FILTER_64      0x04
 #define PNG_ALL_MNG_FEATURES        0x05
 

-typedef png_voidp (*png_malloc_ptr) PNGARG((png_structp, png_size_t));
-typedef void (*png_free_ptr) PNGARG((png_structp, png_voidp));
-
-/* The structure that holds the information to read and write PNG files.
- * The only people who need to care about what is inside of this are the
- * people who will be modifying the library for their own special needs.
- * It should NOT be accessed directly by an application, except to store
- * the jmp_buf.
- */
-
-struct png_struct_def
-{
-#ifdef PNG_SETJMP_SUPPORTED
-   jmp_buf jmpbuf;            /* used in png_error */
-#endif
-   png_error_ptr error_fn;    /* function for printing errors and aborting */
-   png_error_ptr warning_fn;  /* function for printing warnings */
-   png_voidp error_ptr;       /* user supplied struct for error functions */
-   png_rw_ptr write_data_fn;  /* function for writing output data */
-   png_rw_ptr read_data_fn;   /* function for reading input data */
-   png_voidp io_ptr;          /* ptr to application struct for I/O functions */
-
-#if defined(PNG_READ_USER_TRANSFORM_SUPPORTED)
-   png_user_transform_ptr read_user_transform_fn; /* user read transform */
-#endif
-
-#if defined(PNG_WRITE_USER_TRANSFORM_SUPPORTED)
-   png_user_transform_ptr write_user_transform_fn; /* user write transform */
-#endif
-
-/* These were added in libpng-1.0.2 */
-#if defined(PNG_USER_TRANSFORM_PTR_SUPPORTED)
-#if defined(PNG_READ_USER_TRANSFORM_SUPPORTED) || \
-    defined(PNG_WRITE_USER_TRANSFORM_SUPPORTED)
-   png_voidp user_transform_ptr; /* user supplied struct for user transform */
-   png_byte user_transform_depth;    /* bit depth of user transformed pixels */
-   png_byte user_transform_channels; /* channels in user transformed pixels */
-#endif
-#endif
-
-   png_uint_32 mode;          /* tells us where we are in the PNG file */
-   png_uint_32 flags;         /* flags indicating various things to libpng */
-   png_uint_32 transformations; /* which transformations to perform */
-
-   z_stream zstream;          /* pointer to decompression structure (below) */
-   png_bytep zbuf;            /* buffer for zlib */
-   png_size_t zbuf_size;      /* size of zbuf */
-   int zlib_level;            /* holds zlib compression level */
-   int zlib_method;           /* holds zlib compression method */
-   int zlib_window_bits;      /* holds zlib compression window bits */
-   int zlib_mem_level;        /* holds zlib compression memory level */
-   int zlib_strategy;         /* holds zlib compression strategy */
-
-   png_uint_32 width;         /* width of image in pixels */
-   png_uint_32 height;        /* height of image in pixels */
-   png_uint_32 num_rows;      /* number of rows in current pass */
-   png_uint_32 usr_width;     /* width of row at start of write */
-   png_uint_32 rowbytes;      /* size of row in bytes */
-   png_uint_32 irowbytes;     /* size of current interlaced row in bytes */
-   png_uint_32 iwidth;        /* width of current interlaced row in pixels */
-   png_uint_32 row_number;    /* current row in interlace pass */
-   png_bytep prev_row;        /* buffer to save previous (unfiltered) row */
-   png_bytep row_buf;         /* buffer to save current (unfiltered) row */
-#ifndef PNG_NO_WRITE_FILTER
-   png_bytep sub_row;         /* buffer to save "sub" row when filtering */
-   png_bytep up_row;          /* buffer to save "up" row when filtering */
-   png_bytep avg_row;         /* buffer to save "avg" row when filtering */
-   png_bytep paeth_row;       /* buffer to save "Paeth" row when filtering */
-#endif
-   png_row_info row_info;     /* used for transformation routines */
-
-   png_uint_32 idat_size;     /* current IDAT size for read */
-   png_uint_32 crc;           /* current chunk CRC value */
-   png_colorp palette;        /* palette from the input file */
-   png_uint_16 num_palette;   /* number of color entries in palette */
-   png_uint_16 num_trans;     /* number of transparency values */
-   png_byte chunk_name[5];    /* null-terminated name of current chunk */
-   png_byte compression;      /* file compression type (always 0) */
-   png_byte filter;           /* file filter type (always 0) */
-   png_byte interlaced;       /* PNG_INTERLACE_NONE, PNG_INTERLACE_ADAM7 */
-   png_byte pass;             /* current interlace pass (0 - 6) */
-   png_byte do_filter;        /* row filter flags (see PNG_FILTER_ below ) */
-   png_byte color_type;       /* color type of file */
-   png_byte bit_depth;        /* bit depth of file */
-   png_byte usr_bit_depth;    /* bit depth of users row */
-   png_byte pixel_depth;      /* number of bits per pixel */
-   png_byte channels;         /* number of channels in file */
-   png_byte usr_channels;     /* channels at start of write */
-   png_byte sig_bytes;        /* magic bytes read/written from start of file */
-
-#if defined(PNG_READ_FILLER_SUPPORTED) || defined(PNG_WRITE_FILLER_SUPPORTED)
-#ifdef PNG_LEGACY_SUPPORTED
-   png_byte filler;           /* filler byte for pixel expansion */
-#else
-   png_uint_16 filler;           /* filler bytes for pixel expansion */
-#endif
-#endif
-
-#if defined(PNG_bKGD_SUPPORTED)
-   png_byte background_gamma_type;
-#  ifdef PNG_FLOATING_POINT_SUPPORTED
-   float background_gamma;
-#  endif
-   png_color_16 background;   /* background color in screen gamma space */
-#if defined(PNG_READ_GAMMA_SUPPORTED)
-   png_color_16 background_1; /* background normalized to gamma 1.0 */
-#endif
-#endif /* PNG_bKGD_SUPPORTED */
-
-#if defined(PNG_WRITE_FLUSH_SUPPORTED)
-   png_flush_ptr output_flush_fn;/* Function for flushing output */
-   png_uint_32 flush_dist;    /* how many rows apart to flush, 0 - no flush */
-   png_uint_32 flush_rows;    /* number of rows written since last flush */
-#endif
-
-#if defined(PNG_READ_GAMMA_SUPPORTED) || defined(PNG_READ_BACKGROUND_SUPPORTED)
-   int gamma_shift;      /* number of "insignificant" bits 16-bit gamma */
-#ifdef PNG_FLOATING_POINT_SUPPORTED
-   float gamma;          /* file gamma value */
-   float screen_gamma;   /* screen gamma value (display_exponent) */
-#endif
-#endif
-
-#if defined(PNG_READ_GAMMA_SUPPORTED) || defined(PNG_READ_BACKGROUND_SUPPORTED)
-   png_bytep gamma_table;     /* gamma table for 8-bit depth files */
-   png_bytep gamma_from_1;    /* converts from 1.0 to screen */
-   png_bytep gamma_to_1;      /* converts from file to 1.0 */
-   png_uint_16pp gamma_16_table; /* gamma table for 16-bit depth files */
-   png_uint_16pp gamma_16_from_1; /* converts from 1.0 to screen */
-   png_uint_16pp gamma_16_to_1; /* converts from file to 1.0 */
-#endif
-
-#if defined(PNG_READ_GAMMA_SUPPORTED) || defined(PNG_sBIT_SUPPORTED)
-   png_color_8 sig_bit;       /* significant bits in each available channel */
-#endif
-
-#if defined(PNG_READ_SHIFT_SUPPORTED) || defined(PNG_WRITE_SHIFT_SUPPORTED)
-   png_color_8 shift;         /* shift for significant bit tranformation */
-#endif
-
-#if defined(PNG_tRNS_SUPPORTED) || defined(PNG_READ_BACKGROUND_SUPPORTED) \
- || defined(PNG_READ_EXPAND_SUPPORTED) || defined(PNG_READ_BACKGROUND_SUPPORTED)
-   png_bytep trans;           /* transparency values for paletted files */
-   png_color_16 trans_values; /* transparency values for non-paletted files */
-#endif
-
-   png_read_status_ptr read_row_fn;   /* called after each row is decoded */
-   png_write_status_ptr write_row_fn; /* called after each row is encoded */
-#ifdef PNG_PROGRESSIVE_READ_SUPPORTED
-   png_progressive_info_ptr info_fn; /* called after header data fully read */
-   png_progressive_row_ptr row_fn;   /* called after each prog. row is decoded */
-   png_progressive_end_ptr end_fn;   /* called after image is complete */
-   png_bytep save_buffer_ptr;        /* current location in save_buffer */
-   png_bytep save_buffer;            /* buffer for previously read data */
-   png_bytep current_buffer_ptr;     /* current location in current_buffer */
-   png_bytep current_buffer;         /* buffer for recently used data */
-   png_uint_32 push_length;          /* size of current input chunk */
-   png_uint_32 skip_length;          /* bytes to skip in input data */
-   png_size_t save_buffer_size;      /* amount of data now in save_buffer */
-   png_size_t save_buffer_max;       /* total size of save_buffer */
-   png_size_t buffer_size;           /* total amount of available input data */
-   png_size_t current_buffer_size;   /* amount of data now in current_buffer */
-   int process_mode;                 /* what push library is currently doing */
-   int cur_palette;                  /* current push library palette index */
-
-#  if defined(PNG_TEXT_SUPPORTED)
-     png_size_t current_text_size;   /* current size of text input data */
-     png_size_t current_text_left;   /* how much text left to read in input */
-     png_charp current_text;         /* current text chunk buffer */
-     png_charp current_text_ptr;     /* current location in current_text */
-#  endif /* PNG_TEXT_SUPPORTED */
-#endif /* PNG_PROGRESSIVE_READ_SUPPORTED */
-
-#if defined(__TURBOC__) && !defined(_Windows) && !defined(__FLAT__)
-/* for the Borland special 64K segment handler */
-   png_bytepp offset_table_ptr;
-   png_bytep offset_table;
-   png_uint_16 offset_table_number;
-   png_uint_16 offset_table_count;
-   png_uint_16 offset_table_count_free;
-#endif
-
-#if defined(PNG_READ_DITHER_SUPPORTED)
-   png_bytep palette_lookup;         /* lookup table for dithering */
-   png_bytep dither_index;           /* index translation for palette files */
-#endif
-
-#if defined(PNG_READ_DITHER_SUPPORTED) || defined(PNG_hIST_SUPPORTED)
-   png_uint_16p hist;                /* histogram */
-#endif
-
-#if defined(PNG_WRITE_WEIGHTED_FILTER_SUPPORTED)
-   png_byte heuristic_method;        /* heuristic for row filter selection */
-   png_byte num_prev_filters;        /* number of weights for previous rows */
-   png_bytep prev_filters;           /* filter type(s) of previous row(s) */
-   png_uint_16p filter_weights;      /* weight(s) for previous line(s) */
-   png_uint_16p inv_filter_weights;  /* 1/weight(s) for previous line(s) */
-   png_uint_16p filter_costs;        /* relative filter calculation cost */
-   png_uint_16p inv_filter_costs;    /* 1/relative filter calculation cost */
-#endif
-
-#if defined(PNG_TIME_RFC1123_SUPPORTED)
-   png_charp time_buffer;            /* String to hold RFC 1123 time text */
-#endif
-
-/* New members added in libpng-1.0.6 */
-
-#ifdef PNG_FREE_ME_SUPPORTED
-   png_uint_32 free_me;       /* flags items libpng is responsible for freeing */
-#endif
-
-#if defined(PNG_USER_CHUNKS_SUPPORTED)
-   png_voidp user_chunk_ptr;
-   png_user_chunk_ptr read_user_chunk_fn; /* user read chunk handler */
-#endif
-
-#if defined(PNG_UNKNOWN_CHUNKS_SUPPORTED)
-   int num_chunk_list;
-   png_bytep chunk_list;
-#endif
-
-/* New members added in libpng-1.0.3 */
-#if defined(PNG_READ_RGB_TO_GRAY_SUPPORTED)
-   png_byte rgb_to_gray_status;
-   /* These were changed from png_byte in libpng-1.0.6 */
-   png_uint_16 rgb_to_gray_red_coeff;
-   png_uint_16 rgb_to_gray_green_coeff;
-   png_uint_16 rgb_to_gray_blue_coeff;
-#endif
-
-/* New member added in libpng-1.0.4 (renamed in 1.0.9) */
-#if defined(PNG_MNG_FEATURES_SUPPORTED) || \
-    defined(PNG_READ_EMPTY_PLTE_SUPPORTED) || \
-    defined(PNG_WRITE_EMPTY_PLTE_SUPPORTED)
-/* changed from png_byte to png_uint_32 at version 1.2.0 */
-#ifdef PNG_1_0_X
-   png_byte mng_features_permitted;
-#else
-   png_uint_32 mng_features_permitted;
-#endif /* PNG_1_0_X */
-#endif
-
-/* New member added in libpng-1.0.7 */
-#if defined(PNG_READ_GAMMA_SUPPORTED) || defined(PNG_READ_BACKGROUND_SUPPORTED)
-   png_fixed_point int_gamma;
-#endif
-
-/* New member added in libpng-1.0.9, ifdef'ed out in 1.0.12, enabled in 1.2.0 */
-#if defined(PNG_MNG_FEATURES_SUPPORTED)
-   png_byte filter_type;
-#endif
-
-#if defined(PNG_1_0_X)
-/* New member added in libpng-1.0.10, ifdef'ed out in 1.2.0 */
-   png_uint_32 row_buf_size;
-#endif
-
-/* New members added in libpng-1.2.0 */
-#if defined(PNG_ASSEMBLER_CODE_SUPPORTED)
-#  if !defined(PNG_1_0_X)
-#    if defined(PNG_MMX_CODE_SUPPORTED)
-   png_byte     mmx_bitdepth_threshold;
-   png_uint_32  mmx_rowbytes_threshold;
-#    endif
-   png_uint_32  asm_flags;
-#  endif
-#endif
-
-/* New members added in libpng-1.0.2 but first enabled by default in 1.2.0 */
-#ifdef PNG_USER_MEM_SUPPORTED
-   png_voidp mem_ptr;                /* user supplied struct for mem functions */
-   png_malloc_ptr malloc_fn;         /* function for allocating memory */
-   png_free_ptr free_fn;             /* function for freeing memory */
-#endif
-
-/* New member added in libpng-1.0.13 and 1.2.0 */
-   png_bytep big_row_buf;         /* buffer to save current (unfiltered) row */
-
-#if defined(PNG_READ_DITHER_SUPPORTED)
-/* The following three members were added at version 1.0.14 and 1.2.4 */
-   png_bytep dither_sort;            /* working sort array */
-   png_bytep index_to_palette;       /* where the original index currently is */
-                                     /* in the palette */
-   png_bytep palette_to_index;       /* which original index points to this */
-                                     /* palette color */
-#endif
-
-/* New members added in libpng-1.0.16 and 1.2.6 */
-   png_byte compression_type;
-
-#ifdef PNG_SET_USER_LIMITS_SUPPORTED
-   png_uint_32 user_width_max;
-   png_uint_32 user_height_max;
-#endif
-
-/* New member added in libpng-1.0.25 and 1.2.17 */
-#if defined(PNG_UNKNOWN_CHUNKS_SUPPORTED)
-   /* storage for unknown chunk that the library doesn't recognize. */
-   png_unknown_chunk unknown_chunk;
-#endif
-
-/* New members added in libpng-1.2.26 */
-  png_uint_32 old_big_row_buf_size, old_prev_row_size;
-
-/* New member added in libpng-1.2.30 */
-  png_charp chunkdata;  /* buffer for reading chunk data */
-
-};
-
-
-/* This triggers a compiler error in png.c, if png.c and png.h
- * do not agree upon the version number.
+/* NOTE: prior to 1.5 these functions had no 'API' style declaration,
+ * this allowed the zlib default functions to be used on Windows
+ * platforms.  In 1.5 the zlib default malloc (which just calls malloc and
+ * ignores the first argument) should be completely compatible with the
+ * following.

  */
  */

-typedef png_structp version_1_2_34;
+typedef PNG_CALLBACK(png_voidp, *png_malloc_ptr, (png_structp,
+    png_alloc_size_t));
+typedef PNG_CALLBACK(void, *png_free_ptr, (png_structp, png_voidp));

 
 typedef png_struct FAR * FAR * png_structpp;
 
 
 typedef png_struct FAR * FAR * png_structpp;
 

-/* Here are the function definitions most commonly used.  This is not
- * the place to find out how to use libpng.  See libpng.txt for the
+/* Section 3: exported functions
+ * Here are the function definitions most commonly used.  This is not
+ * the place to find out how to use libpng.  See libpng-manual.txt for the

  * full explanation, see example.c for the summary.  This just provides
  * a simple one line description of the use of each function.
  * full explanation, see example.c for the summary.  This just provides
  * a simple one line description of the use of each function.

+ *
+ * The PNG_EXPORT() and PNG_EXPORTA() macros used below are defined in
+ * pngconf.h and in the *.dfn files in the scripts directory.
+ *
+ *   PNG_EXPORT(ordinal, type, name, (args));
+ *
+ *       ordinal:    ordinal that is used while building
+ *                   *.def files. The ordinal value is only
+ *                   relevant when preprocessing png.h with
+ *                   the *.dfn files for building symbol table
+ *                   entries, and are removed by pngconf.h.
+ *       type:       return type of the function
+ *       name:       function name
+ *       args:       function arguments, with types
+ *
+ * When we wish to append attributes to a function prototype we use
+ * the PNG_EXPORTA() macro instead.
+ *
+ *   PNG_EXPORTA(ordinal, type, name, (args), attributes);
+ *
+ *       ordinal, type, name, and args: same as in PNG_EXPORT().
+ *       attributes: function attributes

  */
 
 /* Returns the version number of the library */
  */
 
 /* Returns the version number of the library */

-extern PNG_EXPORT(png_uint_32,png_access_version_number) PNGARG((void));
+PNG_EXPORT(1, png_uint_32, png_access_version_number, (void));

 
 /* Tell lib we have already handled the first <num_bytes> magic bytes.
  * Handling more than 8 bytes from the beginning of the file is an error.
  */
 
 /* Tell lib we have already handled the first <num_bytes> magic bytes.
  * Handling more than 8 bytes from the beginning of the file is an error.
  */

-extern PNG_EXPORT(void,png_set_sig_bytes) PNGARG((png_structp png_ptr,
-   int num_bytes));
+PNG_EXPORT(2, void, png_set_sig_bytes, (png_structp png_ptr, int num_bytes));

 
 /* Check sig[start] through sig[start + num_to_check - 1] to see if it's a
  * PNG file.  Returns zero if the supplied bytes match the 8-byte PNG
  * signature, and non-zero otherwise.  Having num_to_check == 0 or
  * start > 7 will always fail (ie return non-zero).
  */
 
 /* Check sig[start] through sig[start + num_to_check - 1] to see if it's a
  * PNG file.  Returns zero if the supplied bytes match the 8-byte PNG
  * signature, and non-zero otherwise.  Having num_to_check == 0 or
  * start > 7 will always fail (ie return non-zero).
  */

-extern PNG_EXPORT(int,png_sig_cmp) PNGARG((png_bytep sig, png_size_t start,
-   png_size_t num_to_check));
+PNG_EXPORT(3, int, png_sig_cmp, (png_const_bytep sig, png_size_t start,
+    png_size_t num_to_check));

 
 /* Simple signature checking function.  This is the same as calling
  * png_check_sig(sig, n) := !png_sig_cmp(sig, 0, n).
  */
 
 /* 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)
-   PNGARG((png_const_charp user_png_ver, png_voidp error_ptr,
-   png_error_ptr error_fn, png_error_ptr warn_fn));
+PNG_EXPORTA(4, png_structp, png_create_read_struct,
+    (png_const_charp user_png_ver, png_voidp error_ptr,
+    png_error_ptr error_fn, png_error_ptr warn_fn),
+    PNG_ALLOCATED);

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

-extern PNG_EXPORT(png_structp,png_create_write_struct)
-   PNGARG((png_const_charp user_png_ver, png_voidp error_ptr,
-   png_error_ptr error_fn, png_error_ptr warn_fn));
+PNG_EXPORTA(5, png_structp, png_create_write_struct,
+    (png_const_charp user_png_ver, png_voidp error_ptr, png_error_ptr error_fn,
+    png_error_ptr warn_fn),
+    PNG_ALLOCATED);

 
 

-#ifdef PNG_WRITE_SUPPORTED
-extern PNG_EXPORT(png_uint_32,png_get_compression_buffer_size)
-   PNGARG((png_structp png_ptr));
-#endif
+PNG_EXPORT(6, png_size_t, png_get_compression_buffer_size,
+    (png_const_structp png_ptr));

 
 

-#ifdef PNG_WRITE_SUPPORTED
-extern PNG_EXPORT(void,png_set_compression_buffer_size)
-   PNGARG((png_structp png_ptr, png_uint_32 size));
+PNG_EXPORT(7, void, png_set_compression_buffer_size, (png_structp png_ptr,
+    png_size_t size));
+
+/* Moved from pngconf.h in 1.4.0 and modified to ensure setjmp/longjmp
+ * match up.
+ */
+#ifdef PNG_SETJMP_SUPPORTED
+/* This function returns the jmp_buf built in to *png_ptr.  It must be
+ * supplied with an appropriate 'longjmp' function to use on that jmp_buf
+ * unless the default error function is overridden in which case NULL is
+ * acceptable.  The size of the jmp_buf is checked against the actual size
+ * allocated by the library - the call will return NULL on a mismatch
+ * indicating an ABI mismatch.
+ */
+PNG_EXPORT(8, jmp_buf*, png_set_longjmp_fn, (png_structp png_ptr,
+    png_longjmp_ptr longjmp_fn, size_t jmp_buf_size));
+#  define png_jmpbuf(png_ptr) \
+      (*png_set_longjmp_fn((png_ptr), longjmp, sizeof (jmp_buf)))
+#else
+#  define png_jmpbuf(png_ptr) \
+      (LIBPNG_WAS_COMPILED_WITH__PNG_NO_SETJMP)

 #endif
 #endif

+/* This function should be used by libpng applications in place of
+ * longjmp(png_ptr->jmpbuf, val).  If longjmp_fn() has been set, it
+ * will use it; otherwise it will call PNG_ABORT().  This function was
+ * added in libpng-1.5.0.
+ */
+PNG_EXPORTA(9, void, png_longjmp, (png_structp png_ptr, int val),
+    PNG_NORETURN);

 
 

+#ifdef PNG_READ_SUPPORTED

 /* Reset the compression stream */
 /* Reset the compression stream */

-extern PNG_EXPORT(int,png_reset_zstream) PNGARG((png_structp png_ptr));
+PNG_EXPORT(10, int, png_reset_zstream, (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
 
 /* New functions added in libpng-1.0.2 (not enabled by default until 1.2.0) */
 #ifdef PNG_USER_MEM_SUPPORTED

-extern PNG_EXPORT(png_structp,png_create_read_struct_2)
-   PNGARG((png_const_charp user_png_ver, png_voidp error_ptr,
-   png_error_ptr error_fn, png_error_ptr warn_fn, png_voidp mem_ptr,
-   png_malloc_ptr malloc_fn, png_free_ptr free_fn));
-extern PNG_EXPORT(png_structp,png_create_write_struct_2)
-   PNGARG((png_const_charp user_png_ver, png_voidp error_ptr,
-   png_error_ptr error_fn, png_error_ptr warn_fn, png_voidp mem_ptr,
-   png_malloc_ptr malloc_fn, png_free_ptr free_fn));
+PNG_EXPORTA(11, png_structp, png_create_read_struct_2,
+    (png_const_charp user_png_ver, png_voidp error_ptr, png_error_ptr error_fn,
+    png_error_ptr warn_fn,
+    png_voidp mem_ptr, png_malloc_ptr malloc_fn, png_free_ptr free_fn),
+    PNG_ALLOCATED);
+PNG_EXPORTA(12, png_structp, png_create_write_struct_2,
+    (png_const_charp user_png_ver, png_voidp error_ptr, png_error_ptr error_fn,
+    png_error_ptr warn_fn,
+    png_voidp mem_ptr, png_malloc_ptr malloc_fn, png_free_ptr free_fn),
+    PNG_ALLOCATED);

 #endif
 
 #endif
 

+/* Write the PNG file signature. */
+PNG_EXPORT(13, void, png_write_sig, (png_structp png_ptr));
+

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

-extern PNG_EXPORT(void,png_write_chunk) PNGARG((png_structp png_ptr,
-   png_bytep chunk_name, png_bytep data, png_size_t length));
+PNG_EXPORT(14, void, png_write_chunk, (png_structp png_ptr, png_const_bytep
+    chunk_name, png_const_bytep data, png_size_t length));

 
 /* Write the start of a PNG chunk - length and chunk name. */
 
 /* Write the start of a PNG chunk - length and chunk name. */

-extern PNG_EXPORT(void,png_write_chunk_start) PNGARG((png_structp png_ptr,
-   png_bytep chunk_name, png_uint_32 length));
+PNG_EXPORT(15, void, png_write_chunk_start, (png_structp png_ptr,
+    png_const_bytep chunk_name, png_uint_32 length));

 
 /* Write the data of a PNG chunk started with png_write_chunk_start(). */
 
 /* Write the data of a PNG chunk started with png_write_chunk_start(). */

-extern PNG_EXPORT(void,png_write_chunk_data) PNGARG((png_structp png_ptr,
-   png_bytep data, png_size_t length));
+PNG_EXPORT(16, void, png_write_chunk_data, (png_structp png_ptr,
+    png_const_bytep data, png_size_t length));

 
 /* Finish a chunk started with png_write_chunk_start() (includes CRC). */
 
 /* Finish a chunk started with png_write_chunk_start() (includes CRC). */

-extern PNG_EXPORT(void,png_write_chunk_end) PNGARG((png_structp png_ptr));
+PNG_EXPORT(17, void, png_write_chunk_end, (png_structp png_ptr));

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

-extern PNG_EXPORT(png_infop,png_create_info_struct)
-   PNGARG((png_structp png_ptr));
-
-#if defined(PNG_1_0_X) || defined (PNG_1_2_X)
-/* Initialize the info structure (old interface - DEPRECATED) */
-extern PNG_EXPORT(void,png_info_init) PNGARG((png_infop info_ptr));
-#undef png_info_init
-#define png_info_init(info_ptr) png_info_init_3(&info_ptr,\
-    png_sizeof(png_info));
-#endif
+PNG_EXPORTA(18, png_infop, png_create_info_struct, (png_structp png_ptr),
+    PNG_ALLOCATED);

 
 

-extern PNG_EXPORT(void,png_info_init_3) PNGARG((png_infopp info_ptr,
+PNG_EXPORT(19, void, png_info_init_3, (png_infopp info_ptr,

     png_size_t png_info_struct_size));
 
 /* Writes all the PNG information before the image. */
     png_size_t png_info_struct_size));
 
 /* Writes all the PNG information before the image. */

-extern PNG_EXPORT(void,png_write_info_before_PLTE) PNGARG((png_structp png_ptr,
-   png_infop info_ptr));
-extern PNG_EXPORT(void,png_write_info) PNGARG((png_structp png_ptr,
-   png_infop info_ptr));
+PNG_EXPORT(20, void, png_write_info_before_PLTE,
+    (png_structp png_ptr, png_infop info_ptr));
+PNG_EXPORT(21, void, png_write_info,
+    (png_structp png_ptr, png_infop info_ptr));

 
 

-#ifndef PNG_NO_SEQUENTIAL_READ_SUPPORTED
-/* read the information before the actual image data. */
-extern PNG_EXPORT(void,png_read_info) PNGARG((png_structp png_ptr,
-   png_infop info_ptr));
+#ifdef PNG_SEQUENTIAL_READ_SUPPORTED
+/* Read the information before the actual image data. */
+PNG_EXPORT(22, void, png_read_info,
+    (png_structp png_ptr, png_infop info_ptr));

 #endif
 
 #endif
 

-#if defined(PNG_TIME_RFC1123_SUPPORTED)
-extern PNG_EXPORT(png_charp,png_convert_to_rfc1123)
-   PNGARG((png_structp png_ptr, png_timep ptime));
+#ifdef PNG_TIME_RFC1123_SUPPORTED
+PNG_EXPORT(23, png_const_charp, png_convert_to_rfc1123,
+    (png_structp png_ptr,
+    png_const_timep ptime));

 #endif
 
 #endif
 

-#if !defined(_WIN32_WCE)
-/* "time.h" functions are not supported on WindowsCE */
-#if defined(PNG_WRITE_tIME_SUPPORTED)
-/* convert from a struct tm to png_time */
-extern PNG_EXPORT(void,png_convert_from_struct_tm) PNGARG((png_timep ptime,
-   struct tm FAR * ttime));
+#ifdef PNG_CONVERT_tIME_SUPPORTED
+/* Convert from a struct tm to png_time */
+PNG_EXPORT(24, void, png_convert_from_struct_tm, (png_timep ptime,
+    PNG_CONST struct tm FAR * ttime));

 
 

-/* convert from time_t to png_time.  Uses gmtime() */
-extern PNG_EXPORT(void,png_convert_from_time_t) PNGARG((png_timep ptime,
-   time_t ttime));
-#endif /* PNG_WRITE_tIME_SUPPORTED */
-#endif /* _WIN32_WCE */
+/* Convert from time_t to png_time.  Uses gmtime() */
+PNG_EXPORT(25, void, png_convert_from_time_t,
+    (png_timep ptime, time_t ttime));
+#endif /* PNG_CONVERT_tIME_SUPPORTED */

 
 

-#if defined(PNG_READ_EXPAND_SUPPORTED)
+#ifdef PNG_READ_EXPAND_SUPPORTED

 /* Expand data to 24-bit RGB, or 8-bit grayscale, with alpha if available. */
 /* Expand data to 24-bit RGB, or 8-bit grayscale, with alpha if available. */

-extern PNG_EXPORT(void,png_set_expand) PNGARG((png_structp png_ptr));
-#if !defined(PNG_1_0_X)
-extern PNG_EXPORT(void,png_set_expand_gray_1_2_4_to_8) PNGARG((png_structp
-  png_ptr));
-#endif
-extern PNG_EXPORT(void,png_set_palette_to_rgb) PNGARG((png_structp png_ptr));
-extern PNG_EXPORT(void,png_set_tRNS_to_alpha) PNGARG((png_structp png_ptr));
-#if defined(PNG_1_0_X) || defined (PNG_1_2_X)
-/* Deprecated */
-extern PNG_EXPORT(void,png_set_gray_1_2_4_to_8) PNGARG((png_structp png_ptr));
+PNG_EXPORT(26, void, png_set_expand, (png_structp png_ptr));
+PNG_EXPORT(27, void, png_set_expand_gray_1_2_4_to_8, (png_structp png_ptr));
+PNG_EXPORT(28, void, png_set_palette_to_rgb, (png_structp png_ptr));
+PNG_EXPORT(29, void, png_set_tRNS_to_alpha, (png_structp png_ptr));

 #endif
 #endif

+
+#ifdef PNG_READ_EXPAND_16_SUPPORTED
+/* Expand to 16-bit channels, forces conversion of palette to RGB and expansion
+ * of a tRNS chunk if present.
+ */
+PNG_EXPORT(221, void, png_set_expand_16, (png_structp png_ptr));

 #endif
 
 #if defined(PNG_READ_BGR_SUPPORTED) || defined(PNG_WRITE_BGR_SUPPORTED)
 /* Use blue, green, red order for pixels. */
 #endif
 
 #if defined(PNG_READ_BGR_SUPPORTED) || defined(PNG_WRITE_BGR_SUPPORTED)
 /* Use blue, green, red order for pixels. */

-extern PNG_EXPORT(void,png_set_bgr) PNGARG((png_structp png_ptr));
+PNG_EXPORT(30, void, png_set_bgr, (png_structp png_ptr));

 #endif
 
 #endif
 

-#if defined(PNG_READ_GRAY_TO_RGB_SUPPORTED)
+#ifdef PNG_READ_GRAY_TO_RGB_SUPPORTED

 /* Expand the grayscale to 24-bit RGB if necessary. */
 /* Expand the grayscale to 24-bit RGB if necessary. */

-extern PNG_EXPORT(void,png_set_gray_to_rgb) PNGARG((png_structp png_ptr));
+PNG_EXPORT(31, void, png_set_gray_to_rgb, (png_structp png_ptr));

 #endif
 
 #endif
 

-#if defined(PNG_READ_RGB_TO_GRAY_SUPPORTED)
+#ifdef PNG_READ_RGB_TO_GRAY_SUPPORTED

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

-#ifdef PNG_FLOATING_POINT_SUPPORTED
-extern PNG_EXPORT(void,png_set_rgb_to_gray) PNGARG((png_structp png_ptr,
-   int error_action, double red, double green ));
-#endif
-extern PNG_EXPORT(void,png_set_rgb_to_gray_fixed) PNGARG((png_structp png_ptr,
-   int error_action, png_fixed_point red, png_fixed_point green ));
-extern PNG_EXPORT(png_byte,png_get_rgb_to_gray_status) PNGARG((png_structp
-   png_ptr));
-#endif
+#define PNG_ERROR_ACTION_NONE  1
+#define PNG_ERROR_ACTION_WARN  2
+#define PNG_ERROR_ACTION_ERROR 3
+#define PNG_RGB_TO_GRAY_DEFAULT (-1)/*for red/green coefficients*/

 
 

-extern PNG_EXPORT(void,png_build_grayscale_palette) PNGARG((int bit_depth,
-   png_colorp palette));
+PNG_FP_EXPORT(32, void, png_set_rgb_to_gray, (png_structp png_ptr,
+    int error_action, double red, double green));
+PNG_FIXED_EXPORT(33, void, png_set_rgb_to_gray_fixed, (png_structp png_ptr,
+    int error_action, png_fixed_point red, png_fixed_point green));

 
 

-#if defined(PNG_READ_STRIP_ALPHA_SUPPORTED)
-extern PNG_EXPORT(void,png_set_strip_alpha) PNGARG((png_structp png_ptr));
+PNG_EXPORT(34, png_byte, png_get_rgb_to_gray_status, (png_const_structp
+    png_ptr));

 #endif
 
 #endif
 

-#if defined(PNG_READ_SWAP_ALPHA_SUPPORTED) || \
-    defined(PNG_WRITE_SWAP_ALPHA_SUPPORTED)
-extern PNG_EXPORT(void,png_set_swap_alpha) PNGARG((png_structp png_ptr));
+#ifdef PNG_BUILD_GRAYSCALE_PALETTE_SUPPORTED
+PNG_EXPORT(35, void, png_build_grayscale_palette, (int bit_depth,
+    png_colorp palette));

 #endif
 
 #endif
 

-#if defined(PNG_READ_INVERT_ALPHA_SUPPORTED) || \
-    defined(PNG_WRITE_INVERT_ALPHA_SUPPORTED)
-extern PNG_EXPORT(void,png_set_invert_alpha) PNGARG((png_structp png_ptr));
+#ifdef PNG_READ_ALPHA_MODE_SUPPORTED
+/* How the alpha channel is interpreted - this affects how the color channels of
+ * a PNG file are returned when an alpha channel, or tRNS chunk in a palette
+ * file, is present.
+ *
+ * This has no effect on the way pixels are written into a PNG output
+ * datastream. The color samples in a PNG datastream are never premultiplied
+ * with the alpha samples.
+ *
+ * The default is to return data according to the PNG specification: the alpha
+ * channel is a linear measure of the contribution of the pixel to the
+ * corresponding composited pixel.  The gamma encoded color channels must be
+ * scaled according to the contribution and to do this it is necessary to undo
+ * the encoding, scale the color values, perform the composition and reencode
+ * the values.  This is the 'PNG' mode.
+ *
+ * The alternative is to 'associate' the alpha with the color information by
+ * storing color channel values that have been scaled by the alpha.  The
+ * advantage is that the color channels can be resampled (the image can be
+ * scaled) in this form.  The disadvantage is that normal practice is to store
+ * linear, not (gamma) encoded, values and this requires 16-bit channels for
+ * still images rather than the 8-bit channels that are just about sufficient if
+ * gamma encoding is used.  In addition all non-transparent pixel values,
+ * including completely opaque ones, must be gamma encoded to produce the final
+ * image.  This is the 'STANDARD', 'ASSOCIATED' or 'PREMULTIPLIED' mode (the
+ * latter being the two common names for associated alpha color channels.)
+ *
+ * Since it is not necessary to perform arithmetic on opaque color values so
+ * long as they are not to be resampled and are in the final color space it is
+ * possible to optimize the handling of alpha by storing the opaque pixels in
+ * the PNG format (adjusted for the output color space) while storing partially
+ * opaque pixels in the standard, linear, format.  The accuracy required for
+ * standard alpha composition is relatively low, because the pixels are
+ * isolated, therefore typically the accuracy loss in storing 8-bit linear
+ * values is acceptable.  (This is not true if the alpha channel is used to
+ * simulate transparency over large areas - use 16 bits or the PNG mode in
+ * this case!)  This is the 'OPTIMIZED' mode.  For this mode a pixel is
+ * treated as opaque only if the alpha value is equal to the maximum value.
+ *
+ * The final choice is to gamma encode the alpha channel as well.  This is
+ * broken because, in practice, no implementation that uses this choice
+ * correctly undoes the encoding before handling alpha composition.  Use this
+ * choice only if other serious errors in the software or hardware you use
+ * mandate it; the typical serious error is for dark halos to appear around
+ * opaque areas of the composited PNG image because of arithmetic overflow.
+ *
+ * The API function png_set_alpha_mode specifies which of these choices to use
+ * with an enumerated 'mode' value and the gamma of the required output:
+ */
+#define PNG_ALPHA_PNG           0 /* according to the PNG standard */
+#define PNG_ALPHA_STANDARD      1 /* according to Porter/Duff */
+#define PNG_ALPHA_ASSOCIATED    1 /* as above; this is the normal practice */
+#define PNG_ALPHA_PREMULTIPLIED 1 /* as above */
+#define PNG_ALPHA_OPTIMIZED     2 /* 'PNG' for opaque pixels, else 'STANDARD' */
+#define PNG_ALPHA_BROKEN        3 /* the alpha channel is gamma encoded */
+
+PNG_FP_EXPORT(227, void, png_set_alpha_mode, (png_structp png_ptr, int mode,
+    double output_gamma));
+PNG_FIXED_EXPORT(228, void, png_set_alpha_mode_fixed, (png_structp png_ptr,
+    int mode, png_fixed_point output_gamma));
+#endif
+
+#if defined(PNG_READ_GAMMA_SUPPORTED) || defined(PNG_READ_ALPHA_MODE_SUPPORTED)
+/* The output_gamma value is a screen gamma in libpng terminology: it expresses
+ * how to decode the output values, not how they are encoded.  The values used
+ * correspond to the normal numbers used to describe the overall gamma of a
+ * computer display system; for example 2.2 for an sRGB conformant system.  The
+ * values are scaled by 100000 in the _fixed version of the API (so 220000 for
+ * sRGB.)
+ *
+ * The inverse of the value is always used to provide a default for the PNG file
+ * encoding if it has no gAMA chunk and if png_set_gamma() has not been called
+ * to override the PNG gamma information.
+ *
+ * When the ALPHA_OPTIMIZED mode is selected the output gamma is used to encode
+ * opaque pixels however pixels with lower alpha values are not encoded,
+ * regardless of the output gamma setting.
+ *
+ * When the standard Porter Duff handling is requested with mode 1 the output
+ * encoding is set to be linear and the output_gamma value is only relevant
+ * as a default for input data that has no gamma information.  The linear output
+ * encoding will be overridden if png_set_gamma() is called - the results may be
+ * highly unexpected!
+ *
+ * The following numbers are derived from the sRGB standard and the research
+ * behind it.  sRGB is defined to be approximated by a PNG gAMA chunk value of
+ * 0.45455 (1/2.2) for PNG.  The value implicitly includes any viewing
+ * correction required to take account of any differences in the color
+ * environment of the original scene and the intended display environment; the
+ * value expresses how to *decode* the image for display, not how the original
+ * data was *encoded*.
+ *
+ * sRGB provides a peg for the PNG standard by defining a viewing environment.
+ * sRGB itself, and earlier TV standards, actually use a more complex transform
+ * (a linear portion then a gamma 2.4 power law) than PNG can express.  (PNG is
+ * limited to simple power laws.)  By saying that an image for direct display on
+ * an sRGB conformant system should be stored with a gAMA chunk value of 45455
+ * (11.3.3.2 and 11.3.3.5 of the ISO PNG specification) the PNG specification
+ * makes it possible to derive values for other display systems and
+ * environments.
+ *
+ * The Mac value is deduced from the sRGB based on an assumption that the actual
+ * extra viewing correction used in early Mac display systems was implemented as
+ * a power 1.45 lookup table.
+ *
+ * Any system where a programmable lookup table is used or where the behavior of
+ * the final display device characteristics can be changed requires system
+ * specific code to obtain the current characteristic.  However this can be
+ * difficult and most PNG gamma correction only requires an approximate value.
+ *
+ * By default, if png_set_alpha_mode() is not called, libpng assumes that all
+ * values are unencoded, linear, values and that the output device also has a
+ * linear characteristic.  This is only very rarely correct - it is invariably
+ * better to call png_set_alpha_mode() with PNG_DEFAULT_sRGB than rely on the
+ * default if you don't know what the right answer is!
+ *
+ * The special value PNG_GAMMA_MAC_18 indicates an older Mac system (pre Mac OS
+ * 10.6) which used a correction table to implement a somewhat lower gamma on an
+ * otherwise sRGB system.
+ *
+ * Both these values are reserved (not simple gamma values) in order to allow
+ * more precise correction internally in the future.
+ *
+ * NOTE: the following values can be passed to either the fixed or floating
+ * point APIs, but the floating point API will also accept floating point
+ * values.
+ */
+#define PNG_DEFAULT_sRGB -1       /* sRGB gamma and color space */
+#define PNG_GAMMA_MAC_18 -2       /* Old Mac '1.8' gamma and color space */
+#define PNG_GAMMA_sRGB   220000   /* Television standards--matches sRGB gamma */
+#define PNG_GAMMA_LINEAR PNG_FP_1 /* Linear */

 #endif
 
 #endif
 

-#if defined(PNG_READ_FILLER_SUPPORTED) || defined(PNG_WRITE_FILLER_SUPPORTED)
-/* Add a filler byte to 8-bit Gray or 24-bit RGB images. */
-extern PNG_EXPORT(void,png_set_filler) PNGARG((png_structp png_ptr,
-   png_uint_32 filler, int flags));
-/* The values of the PNG_FILLER_ defines should NOT be changed */
-#define PNG_FILLER_BEFORE 0
-#define PNG_FILLER_AFTER 1
-/* Add an alpha byte to 8-bit Gray or 24-bit RGB images. */
-#if !defined(PNG_1_0_X)
-extern PNG_EXPORT(void,png_set_add_alpha) PNGARG((png_structp png_ptr,
-   png_uint_32 filler, int flags));
-#endif
+/* The following are examples of calls to png_set_alpha_mode to achieve the
+ * required overall gamma correction and, where necessary, alpha
+ * premultiplication.
+ *
+ * png_set_alpha_mode(pp, PNG_ALPHA_PNG, PNG_DEFAULT_sRGB);
+ *    This is the default libpng handling of the alpha channel - it is not
+ *    pre-multiplied into the color components.  In addition the call states
+ *    that the output is for a sRGB system and causes all PNG files without gAMA
+ *    chunks to be assumed to be encoded using sRGB.
+ *
+ * png_set_alpha_mode(pp, PNG_ALPHA_PNG, PNG_GAMMA_MAC);
+ *    In this case the output is assumed to be something like an sRGB conformant
+ *    display preceeded by a power-law lookup table of power 1.45.  This is how
+ *    early Mac systems behaved.
+ *
+ * png_set_alpha_mode(pp, PNG_ALPHA_STANDARD, PNG_GAMMA_LINEAR);
+ *    This is the classic Jim Blinn approach and will work in academic
+ *    environments where everything is done by the book.  It has the shortcoming
+ *    of assuming that input PNG data with no gamma information is linear - this
+ *    is unlikely to be correct unless the PNG files where generated locally.
+ *    Most of the time the output precision will be so low as to show
+ *    significant banding in dark areas of the image.
+ *
+ * png_set_expand_16(pp);
+ * png_set_alpha_mode(pp, PNG_ALPHA_STANDARD, PNG_DEFAULT_sRGB);
+ *    This is a somewhat more realistic Jim Blinn inspired approach.  PNG files
+ *    are assumed to have the sRGB encoding if not marked with a gamma value and
+ *    the output is always 16 bits per component.  This permits accurate scaling
+ *    and processing of the data.  If you know that your input PNG files were
+ *    generated locally you might need to replace PNG_DEFAULT_sRGB with the
+ *    correct value for your system.
+ *
+ * png_set_alpha_mode(pp, PNG_ALPHA_OPTIMIZED, PNG_DEFAULT_sRGB);
+ *    If you just need to composite the PNG image onto an existing background
+ *    and if you control the code that does this you can use the optimization
+ *    setting.  In this case you just copy completely opaque pixels to the
+ *    output.  For pixels that are not completely transparent (you just skip
+ *    those) you do the composition math using png_composite or png_composite_16
+ *    below then encode the resultant 8-bit or 16-bit values to match the output
+ *    encoding.
+ *
+ * Other cases
+ *    If neither the PNG nor the standard linear encoding work for you because
+ *    of the software or hardware you use then you have a big problem.  The PNG
+ *    case will probably result in halos around the image.  The linear encoding
+ *    will probably result in a washed out, too bright, image (it's actually too
+ *    contrasty.)  Try the ALPHA_OPTIMIZED mode above - this will probably
+ *    substantially reduce the halos.  Alternatively try:
+ *
+ * png_set_alpha_mode(pp, PNG_ALPHA_BROKEN, PNG_DEFAULT_sRGB);
+ *    This option will also reduce the halos, but there will be slight dark
+ *    halos round the opaque parts of the image where the background is light.
+ *    In the OPTIMIZED mode the halos will be light halos where the background
+ *    is dark.  Take your pick - the halos are unavoidable unless you can get
+ *    your hardware/software fixed!  (The OPTIMIZED approach is slightly
+ *    faster.)
+ *
+ * When the default gamma of PNG files doesn't match the output gamma.
+ *    If you have PNG files with no gamma information png_set_alpha_mode allows
+ *    you to provide a default gamma, but it also sets the ouput gamma to the
+ *    matching value.  If you know your PNG files have a gamma that doesn't
+ *    match the output you can take advantage of the fact that
+ *    png_set_alpha_mode always sets the output gamma but only sets the PNG
+ *    default if it is not already set:
+ *
+ * png_set_alpha_mode(pp, PNG_ALPHA_PNG, PNG_DEFAULT_sRGB);
+ * png_set_alpha_mode(pp, PNG_ALPHA_PNG, PNG_GAMMA_MAC);
+ *    The first call sets both the default and the output gamma values, the
+ *    second call overrides the output gamma without changing the default.  This
+ *    is easier than achieving the same effect with png_set_gamma.  You must use
+ *    PNG_ALPHA_PNG for the first call - internal checking in png_set_alpha will
+ *    fire if more than one call to png_set_alpha_mode and png_set_background is
+ *    made in the same read operation, however multiple calls with PNG_ALPHA_PNG
+ *    are ignored.
+ */
+
+#ifdef PNG_READ_STRIP_ALPHA_SUPPORTED
+PNG_EXPORT(36, void, png_set_strip_alpha, (png_structp png_ptr));
+#endif
+
+#if defined(PNG_READ_SWAP_ALPHA_SUPPORTED) || \
+    defined(PNG_WRITE_SWAP_ALPHA_SUPPORTED)
+PNG_EXPORT(37, void, png_set_swap_alpha, (png_structp png_ptr));
+#endif
+
+#if defined(PNG_READ_INVERT_ALPHA_SUPPORTED) || \
+    defined(PNG_WRITE_INVERT_ALPHA_SUPPORTED)
+PNG_EXPORT(38, void, png_set_invert_alpha, (png_structp png_ptr));
+#endif
+
+#if defined(PNG_READ_FILLER_SUPPORTED) || defined(PNG_WRITE_FILLER_SUPPORTED)
+/* Add a filler byte to 8-bit Gray or 24-bit RGB images. */
+PNG_EXPORT(39, void, png_set_filler, (png_structp png_ptr, png_uint_32 filler,
+    int flags));
+/* The values of the PNG_FILLER_ defines should NOT be changed */
+#  define PNG_FILLER_BEFORE 0
+#  define PNG_FILLER_AFTER 1
+/* Add an alpha byte to 8-bit Gray or 24-bit RGB images. */
+PNG_EXPORT(40, void, png_set_add_alpha,
+    (png_structp png_ptr, png_uint_32 filler,
+    int flags));

 #endif /* PNG_READ_FILLER_SUPPORTED || PNG_WRITE_FILLER_SUPPORTED */
 
 #if defined(PNG_READ_SWAP_SUPPORTED) || defined(PNG_WRITE_SWAP_SUPPORTED)
 /* Swap bytes in 16-bit depth files. */
 #endif /* PNG_READ_FILLER_SUPPORTED || PNG_WRITE_FILLER_SUPPORTED */
 
 #if defined(PNG_READ_SWAP_SUPPORTED) || defined(PNG_WRITE_SWAP_SUPPORTED)
 /* Swap bytes in 16-bit depth files. */

-extern PNG_EXPORT(void,png_set_swap) PNGARG((png_structp png_ptr));
+PNG_EXPORT(41, void, png_set_swap, (png_structp png_ptr));

 #endif
 
 #if defined(PNG_READ_PACK_SUPPORTED) || defined(PNG_WRITE_PACK_SUPPORTED)
 /* Use 1 byte per pixel in 1, 2, or 4-bit depth files. */
 #endif
 
 #if defined(PNG_READ_PACK_SUPPORTED) || defined(PNG_WRITE_PACK_SUPPORTED)
 /* Use 1 byte per pixel in 1, 2, or 4-bit depth files. */

-extern PNG_EXPORT(void,png_set_packing) PNGARG((png_structp png_ptr));
+PNG_EXPORT(42, void, png_set_packing, (png_structp png_ptr));

 #endif
 
 #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));
+PNG_EXPORT(43, void, png_set_packswap, (png_structp png_ptr));

 #endif
 
 #if defined(PNG_READ_SHIFT_SUPPORTED) || defined(PNG_WRITE_SHIFT_SUPPORTED)
 /* Converts files to legal bit depths. */
 #endif
 
 #if defined(PNG_READ_SHIFT_SUPPORTED) || defined(PNG_WRITE_SHIFT_SUPPORTED)
 /* Converts files to legal bit depths. */

-extern PNG_EXPORT(void,png_set_shift) PNGARG((png_structp png_ptr,
-   png_color_8p true_bits));
+PNG_EXPORT(44, void, png_set_shift, (png_structp png_ptr, png_const_color_8p
+    true_bits));

 #endif
 
 #if defined(PNG_READ_INTERLACING_SUPPORTED) || \
     defined(PNG_WRITE_INTERLACING_SUPPORTED)
 #endif
 
 #if defined(PNG_READ_INTERLACING_SUPPORTED) || \
     defined(PNG_WRITE_INTERLACING_SUPPORTED)

-/* Have the code handle the interlacing.  Returns the number of passes. */
-extern PNG_EXPORT(int,png_set_interlace_handling) PNGARG((png_structp png_ptr));
+/* Have the code handle the interlacing.  Returns the number of passes.
+ * MUST be called before png_read_update_info or png_start_read_image,
+ * otherwise it will not have the desired effect.  Note that it is still
+ * necessary to call png_read_row or png_read_rows png_get_image_height
+ * times for each pass.
+*/
+PNG_EXPORT(45, int, png_set_interlace_handling, (png_structp png_ptr));

 #endif
 
 #if defined(PNG_READ_INVERT_SUPPORTED) || defined(PNG_WRITE_INVERT_SUPPORTED)
 /* Invert monochrome files */
 #endif
 
 #if defined(PNG_READ_INVERT_SUPPORTED) || defined(PNG_WRITE_INVERT_SUPPORTED)
 /* Invert monochrome files */

-extern PNG_EXPORT(void,png_set_invert_mono) PNGARG((png_structp png_ptr));
+PNG_EXPORT(46, void, png_set_invert_mono, (png_structp png_ptr));

 #endif
 
 #endif
 

-#if defined(PNG_READ_BACKGROUND_SUPPORTED)
-/* Handle alpha and tRNS by replacing with a background color. */
-#ifdef PNG_FLOATING_POINT_SUPPORTED
-extern PNG_EXPORT(void,png_set_background) PNGARG((png_structp png_ptr,
-   png_color_16p background_color, int background_gamma_code,
-   int need_expand, double background_gamma));
+#ifdef PNG_READ_BACKGROUND_SUPPORTED
+/* Handle alpha and tRNS by replacing with a background color.  Prior to
+ * libpng-1.5.4 this API must not be called before the PNG file header has been
+ * read.  Doing so will result in unexpected behavior and possible warnings or
+ * errors if the PNG file contains a bKGD chunk.
+ */
+PNG_FP_EXPORT(47, void, png_set_background, (png_structp png_ptr,
+    png_const_color_16p background_color, int background_gamma_code,
+    int need_expand, double background_gamma));
+PNG_FIXED_EXPORT(215, void, png_set_background_fixed, (png_structp png_ptr,
+    png_const_color_16p background_color, int background_gamma_code,
+    int need_expand, png_fixed_point background_gamma));

 #endif
 #endif

-#define PNG_BACKGROUND_GAMMA_UNKNOWN 0
-#define PNG_BACKGROUND_GAMMA_SCREEN  1
-#define PNG_BACKGROUND_GAMMA_FILE    2
-#define PNG_BACKGROUND_GAMMA_UNIQUE  3
+#ifdef PNG_READ_BACKGROUND_SUPPORTED
+#  define PNG_BACKGROUND_GAMMA_UNKNOWN 0
+#  define PNG_BACKGROUND_GAMMA_SCREEN  1
+#  define PNG_BACKGROUND_GAMMA_FILE    2
+#  define PNG_BACKGROUND_GAMMA_UNIQUE  3

 #endif
 
 #endif
 

-#if defined(PNG_READ_16_TO_8_SUPPORTED)
-/* strip the second byte of information from a 16-bit depth file. */
-extern PNG_EXPORT(void,png_set_strip_16) PNGARG((png_structp png_ptr));
+#ifdef PNG_READ_SCALE_16_TO_8_SUPPORTED
+/* Scale a 16-bit depth file down to 8-bit, accurately. */
+PNG_EXPORT(229, void, png_set_scale_16, (png_structp png_ptr));

 #endif
 
 #endif
 

-#if defined(PNG_READ_DITHER_SUPPORTED)
-/* Turn on dithering, and reduce the palette to the number of colors available. */
-extern PNG_EXPORT(void,png_set_dither) PNGARG((png_structp png_ptr,
-   png_colorp palette, int num_palette, int maximum_colors,
-   png_uint_16p histogram, int full_dither));
+#ifdef PNG_READ_STRIP_16_TO_8_SUPPORTED
+#define PNG_READ_16_TO_8 SUPPORTED /* Name prior to 1.5.4 */
+/* Strip the second byte of information from a 16-bit depth file. */
+PNG_EXPORT(48, void, png_set_strip_16, (png_structp png_ptr));

 #endif
 
 #endif
 

-#if defined(PNG_READ_GAMMA_SUPPORTED)
-/* Handle gamma correction. Screen_gamma=(display_exponent) */
-#ifdef PNG_FLOATING_POINT_SUPPORTED
-extern PNG_EXPORT(void,png_set_gamma) PNGARG((png_structp png_ptr,
-   double screen_gamma, double default_file_gamma));
-#endif
+#ifdef PNG_READ_QUANTIZE_SUPPORTED
+/* Turn on quantizing, and reduce the palette to the number of colors
+ * available.
+ */
+PNG_EXPORT(49, void, png_set_quantize,
+    (png_structp png_ptr, png_colorp palette,
+    int num_palette, int maximum_colors, png_const_uint_16p histogram,
+    int full_quantize));

 #endif
 
 #endif
 

-#if defined(PNG_1_0_X) || defined (PNG_1_2_X)
-#if defined(PNG_READ_EMPTY_PLTE_SUPPORTED) || \
-    defined(PNG_WRITE_EMPTY_PLTE_SUPPORTED)
-/* Permit or disallow empty PLTE (0: not permitted, 1: permitted) */
-/* Deprecated and will be removed.  Use png_permit_mng_features() instead. */
-extern PNG_EXPORT(void,png_permit_empty_plte) PNGARG((png_structp png_ptr,
-   int empty_plte_permitted));
-#endif
+#ifdef PNG_READ_GAMMA_SUPPORTED
+/* The threshold on gamma processing is configurable but hard-wired into the
+ * library.  The following is the floating point variant.
+ */
+#define PNG_GAMMA_THRESHOLD (PNG_GAMMA_THRESHOLD_FIXED*.00001)
+
+/* Handle gamma correction. Screen_gamma=(display_exponent).
+ * NOTE: this API simply sets the screen and file gamma values. It will
+ * therefore override the value for gamma in a PNG file if it is called after
+ * the file header has been read - use with care  - call before reading the PNG
+ * file for best results!
+ *
+ * These routines accept the same gamma values as png_set_alpha_mode (described
+ * above).  The PNG_GAMMA_ defines and PNG_DEFAULT_sRGB can be passed to either
+ * API (floating point or fixed.)  Notice, however, that the 'file_gamma' value
+ * is the inverse of a 'screen gamma' value.
+ */
+PNG_FP_EXPORT(50, void, png_set_gamma,
+    (png_structp png_ptr, double screen_gamma,
+    double override_file_gamma));
+PNG_FIXED_EXPORT(208, void, png_set_gamma_fixed, (png_structp png_ptr,
+    png_fixed_point screen_gamma, png_fixed_point override_file_gamma));

 #endif
 
 #endif
 

-#if defined(PNG_WRITE_FLUSH_SUPPORTED)
+#ifdef PNG_WRITE_FLUSH_SUPPORTED

 /* Set how many lines between output flushes - 0 for no flushing */
 /* Set how many lines between output flushes - 0 for no flushing */

-extern PNG_EXPORT(void,png_set_flush) PNGARG((png_structp png_ptr, int nrows));
+PNG_EXPORT(51, void, png_set_flush, (png_structp png_ptr, int nrows));

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

-extern PNG_EXPORT(void,png_write_flush) PNGARG((png_structp png_ptr));
+PNG_EXPORT(52, void, png_write_flush, (png_structp png_ptr));

 #endif
 
 #endif
 

-/* optional update palette with requested transformations */
-extern PNG_EXPORT(void,png_start_read_image) PNGARG((png_structp png_ptr));
+/* Optional update palette with requested transformations */
+PNG_EXPORT(53, void, png_start_read_image, (png_structp png_ptr));

 
 

-/* optional call to update the users info structure */
-extern PNG_EXPORT(void,png_read_update_info) PNGARG((png_structp png_ptr,
-   png_infop info_ptr));
+/* Optional call to update the users info structure */
+PNG_EXPORT(54, void, png_read_update_info,
+    (png_structp png_ptr, png_infop info_ptr));

 
 

-#ifndef PNG_NO_SEQUENTIAL_READ_SUPPORTED
-/* read one or more rows of image data. */
-extern PNG_EXPORT(void,png_read_rows) PNGARG((png_structp png_ptr,
-   png_bytepp row, png_bytepp display_row, png_uint_32 num_rows));
+#ifdef PNG_SEQUENTIAL_READ_SUPPORTED
+/* Read one or more rows of image data. */
+PNG_EXPORT(55, void, png_read_rows, (png_structp png_ptr, png_bytepp row,
+    png_bytepp display_row, png_uint_32 num_rows));

 #endif
 
 #endif
 

-#ifndef PNG_NO_SEQUENTIAL_READ_SUPPORTED
-/* read a row of data. */
-extern PNG_EXPORT(void,png_read_row) PNGARG((png_structp png_ptr,
-   png_bytep row,
-   png_bytep display_row));
+#ifdef PNG_SEQUENTIAL_READ_SUPPORTED
+/* Read a row of data. */
+PNG_EXPORT(56, void, png_read_row, (png_structp png_ptr, png_bytep row,
+    png_bytep display_row));

 #endif
 
 #endif
 

-#ifndef PNG_NO_SEQUENTIAL_READ_SUPPORTED
-/* read the whole image into memory at once. */
-extern PNG_EXPORT(void,png_read_image) PNGARG((png_structp png_ptr,
-   png_bytepp image));
+#ifdef PNG_SEQUENTIAL_READ_SUPPORTED
+/* Read the whole image into memory at once. */
+PNG_EXPORT(57, void, png_read_image, (png_structp png_ptr, png_bytepp image));

 #endif
 
 #endif
 

-/* write a row of image data */
-extern PNG_EXPORT(void,png_write_row) PNGARG((png_structp png_ptr,
-   png_bytep row));
+/* Write a row of image data */
+PNG_EXPORT(58, void, png_write_row,
+    (png_structp png_ptr, png_const_bytep row));

 
 

-/* write a few rows of image data */
-extern PNG_EXPORT(void,png_write_rows) PNGARG((png_structp png_ptr,
-   png_bytepp row, png_uint_32 num_rows));
+/* Write a few rows of image data: (*row) is not written; however, the type
+ * is declared as writeable to maintain compatibility with previous versions
+ * of libpng and to allow the 'display_row' array from read_rows to be passed
+ * unchanged to write_rows.
+ */
+PNG_EXPORT(59, void, png_write_rows, (png_structp png_ptr, png_bytepp row,
+    png_uint_32 num_rows));

 
 

-/* write the image data */
-extern PNG_EXPORT(void,png_write_image) PNGARG((png_structp png_ptr,
-   png_bytepp image));
+/* Write the image data */
+PNG_EXPORT(60, void, png_write_image,
+    (png_structp png_ptr, png_bytepp image));

 
 

-/* writes the end of the PNG file. */
-extern PNG_EXPORT(void,png_write_end) PNGARG((png_structp png_ptr,
-   png_infop info_ptr));
+/* Write the end of the PNG file. */
+PNG_EXPORT(61, void, png_write_end,
+    (png_structp png_ptr, png_infop info_ptr));

 
 

-#ifndef PNG_NO_SEQUENTIAL_READ_SUPPORTED
-/* read the end of the PNG file. */
-extern PNG_EXPORT(void,png_read_end) PNGARG((png_structp png_ptr,
-   png_infop info_ptr));
+#ifdef PNG_SEQUENTIAL_READ_SUPPORTED
+/* Read the end of the PNG file. */
+PNG_EXPORT(62, void, png_read_end, (png_structp png_ptr, png_infop info_ptr));

 #endif
 
 #endif
 

-/* free any memory associated with the png_info_struct */
-extern PNG_EXPORT(void,png_destroy_info_struct) PNGARG((png_structp png_ptr,
-   png_infopp info_ptr_ptr));
-
-/* free any memory associated with the png_struct and the png_info_structs */
-extern PNG_EXPORT(void,png_destroy_read_struct) PNGARG((png_structpp
-   png_ptr_ptr, png_infopp info_ptr_ptr, png_infopp end_info_ptr_ptr));
+/* Free any memory associated with the png_info_struct */
+PNG_EXPORT(63, void, png_destroy_info_struct, (png_structp png_ptr,
+    png_infopp info_ptr_ptr));

 
 

-/* free all memory used by the read (old method - NOT DLL EXPORTED) */
-extern void png_read_destroy PNGARG((png_structp png_ptr, png_infop info_ptr,
-   png_infop end_info_ptr));
+/* Free any memory associated with the png_struct and the png_info_structs */
+PNG_EXPORT(64, void, png_destroy_read_struct, (png_structpp png_ptr_ptr,
+    png_infopp info_ptr_ptr, png_infopp end_info_ptr_ptr));

 
 

-/* free any memory associated with the png_struct and the png_info_structs */
-extern PNG_EXPORT(void,png_destroy_write_struct)
-   PNGARG((png_structpp png_ptr_ptr, png_infopp info_ptr_ptr));
+/* Free any memory associated with the png_struct and the png_info_structs */
+PNG_EXPORT(65, void, png_destroy_write_struct, (png_structpp png_ptr_ptr,
+    png_infopp info_ptr_ptr));

 
 

-/* free any memory 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 */
+PNG_EXPORT(66, void, png_set_crc_action,
+    (png_structp png_ptr, int crit_action, int ancil_action));

 
 

-/* set the libpng method of handling chunk CRC errors */
-extern PNG_EXPORT(void,png_set_crc_action) PNGARG((png_structp png_ptr,
-   int crit_action, int ancil_action));
-
-/* Values for png_set_crc_action() to say how to handle CRC errors in
+/* Values for png_set_crc_action() say how to handle CRC errors in

  * ancillary and critical chunks, and whether to use the data contained
  * therein.  Note that it is impossible to "discard" data in a critical
  * chunk.  For versions prior to 0.90, the action was always error/quit,
  * ancillary and critical chunks, and whether to use the data contained
  * therein.  Note that it is impossible to "discard" data in a critical
  * chunk.  For versions prior to 0.90, the action was always error/quit,


@@ -1854,11 +1593,11 @@ 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,
-   int filters));
+PNG_EXPORT(67, void, png_set_filter,
+    (png_structp png_ptr, int method, int filters));

 
 /* Flags for png_set_filter() to say which filters to use.  The flags
  * are chosen so that they don't conflict with real filter types
 
 /* Flags for png_set_filter() to say which filters to use.  The flags
  * are chosen so that they don't conflict with real filter types


@@ -1884,7 +1623,7 @@ 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).


@@ -1913,11 +1652,13 @@ 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.
  */

-#ifdef PNG_FLOATING_POINT_SUPPORTED
-extern PNG_EXPORT(void,png_set_filter_heuristics) PNGARG((png_structp png_ptr,
-   int heuristic_method, int num_weights, png_doublep filter_weights,
-   png_doublep filter_costs));
-#endif
+PNG_FP_EXPORT(68, void, png_set_filter_heuristics, (png_structp png_ptr,
+    int heuristic_method, int num_weights, png_const_doublep filter_weights,
+    png_const_doublep filter_costs));
+PNG_FIXED_EXPORT(209, void, png_set_filter_heuristics_fixed,
+    (png_structp png_ptr,
+    int heuristic_method, int num_weights, png_const_fixed_point_p
+    filter_weights, png_const_fixed_point_p filter_costs));

 #endif /*  PNG_WRITE_WEIGHTED_FILTER_SUPPORTED */
 
 /* Heuristic used for row filter selection.  These defines should NOT be
 #endif /*  PNG_WRITE_WEIGHTED_FILTER_SUPPORTED */
 
 /* Heuristic used for row filter selection.  These defines should NOT be


@@ -1928,6 +1669,7 @@ extern PNG_EXPORT(void,png_set_filter_heuristics) PNGARG((png_structp png_ptr,
 #define PNG_FILTER_HEURISTIC_WEIGHTED   2  /* Experimental feature */
 #define PNG_FILTER_HEURISTIC_LAST       3  /* Not a valid value */
 
 #define PNG_FILTER_HEURISTIC_WEIGHTED   2  /* Experimental feature */
 #define PNG_FILTER_HEURISTIC_LAST       3  /* Not a valid value */
 

+#ifdef PNG_WRITE_SUPPORTED

 /* Set the library compression level.  Currently, valid values range from
  * 0 - 9, corresponding directly to the zlib compression levels 0 - 9
  * (0 - no compression, 9 - "maximal" compression).  Note that tests have
 /* Set the library compression level.  Currently, valid values range from
  * 0 - 9, corresponding directly to the zlib compression levels 0 - 9
  * (0 - no compression, 9 - "maximal" compression).  Note that tests have


@@ -1935,33 +1677,58 @@ 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,
-   int level));
+PNG_EXPORT(69, void, png_set_compression_level,
+    (png_structp png_ptr, int level));
+
+PNG_EXPORT(70, void, png_set_compression_mem_level, (png_structp png_ptr,
+    int mem_level));
+
+PNG_EXPORT(71, void, png_set_compression_strategy, (png_structp png_ptr,
+    int strategy));
+
+/* If PNG_WRITE_OPTIMIZE_CMF_SUPPORTED is defined, libpng will use a
+ * smaller value of window_bits if it can do so safely.
+ */
+PNG_EXPORT(72, void, png_set_compression_window_bits, (png_structp png_ptr,
+    int window_bits));
+
+PNG_EXPORT(73, void, png_set_compression_method, (png_structp png_ptr,
+    int method));
+#endif
+
+#ifdef PNG_WRITE_CUSTOMIZE_ZTXT_COMPRESSION_SUPPORTED
+/* Also set zlib parameters for compressing non-IDAT chunks */
+PNG_EXPORT(222, void, png_set_text_compression_level,
+    (png_structp png_ptr, int level));

 
 

-extern PNG_EXPORT(void,png_set_compression_mem_level)
-   PNGARG((png_structp png_ptr, int mem_level));
+PNG_EXPORT(223, void, png_set_text_compression_mem_level, (png_structp png_ptr,
+    int mem_level));

 
 

-extern PNG_EXPORT(void,png_set_compression_strategy)
-   PNGARG((png_structp png_ptr, int strategy));
+PNG_EXPORT(224, void, png_set_text_compression_strategy, (png_structp png_ptr,
+    int strategy));

 
 

-extern PNG_EXPORT(void,png_set_compression_window_bits)
-   PNGARG((png_structp png_ptr, int window_bits));
+/* If PNG_WRITE_OPTIMIZE_CMF_SUPPORTED is defined, libpng will use a
+ * smaller value of window_bits if it can do so safely.
+ */
+PNG_EXPORT(225, void, png_set_text_compression_window_bits, (png_structp
+    png_ptr, int window_bits));

 
 

-extern PNG_EXPORT(void,png_set_compression_method) PNGARG((png_structp png_ptr,
-   int method));
+PNG_EXPORT(226, void, png_set_text_compression_method, (png_structp png_ptr,
+    int method));
+#endif /* PNG_WRITE_CUSTOMIZE_ZTXT_COMPRESSION_SUPPORTED */

 
 /* These next functions are called for input/output, memory, and error
  * handling.  They are in the file pngrio.c, pngwio.c, and pngerror.c,
  * and call standard C I/O routines such as fread(), fwrite(), and
  * fprintf().  These functions can be made to use other I/O routines
  * at run time for those applications that need to handle I/O in a
 
 /* These next functions are called for input/output, memory, and error
  * handling.  They are in the file pngrio.c, pngwio.c, and pngerror.c,
  * and call standard C I/O routines such as fread(), fwrite(), and
  * fprintf().  These functions can be made to use other I/O routines
  * at run time for those applications that need to handle I/O in a

- * different manner by calling png_set_???_fn().  See libpng.txt for
+ * different manner by calling png_set_???_fn().  See libpng-manual.txt for

  * more information.
  */
 
  * 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, png_FILE_p fp));
+PNG_EXPORT(74, void, png_init_io, (png_structp png_ptr, png_FILE_p fp));

 #endif
 
 /* Replace the (error and abort), and warning functions with user
 #endif
 
 /* Replace the (error and abort), and warning functions with user


@@ -1972,128 +1739,157 @@ extern PNG_EXPORT(void,png_init_io) PNGARG((png_structp png_ptr, png_FILE_p 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_voidp error_ptr, png_error_ptr error_fn, png_error_ptr warning_fn));
+PNG_EXPORT(75, void, png_set_error_fn,
+    (png_structp png_ptr, png_voidp error_ptr,
+    png_error_ptr error_fn, png_error_ptr warning_fn));

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

-extern PNG_EXPORT(png_voidp,png_get_error_ptr) PNGARG((png_structp png_ptr));
+PNG_EXPORT(76, png_voidp, png_get_error_ptr, (png_const_structp png_ptr));

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

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

  */
  */

-extern PNG_EXPORT(void,png_set_write_fn) PNGARG((png_structp png_ptr,
-   png_voidp io_ptr, png_rw_ptr write_data_fn, png_flush_ptr output_flush_fn));
+PNG_EXPORT(77, void, png_set_write_fn, (png_structp png_ptr, png_voidp io_ptr,
+    png_rw_ptr write_data_fn, png_flush_ptr output_flush_fn));

 
 /* Replace the default data input function with a user supplied one. */
 
 /* Replace the default data input function with a user supplied one. */

-extern PNG_EXPORT(void,png_set_read_fn) PNGARG((png_structp png_ptr,
-   png_voidp io_ptr, png_rw_ptr read_data_fn));
+PNG_EXPORT(78, void, png_set_read_fn, (png_structp png_ptr, png_voidp io_ptr,
+    png_rw_ptr read_data_fn));

 
 /* Return the user pointer associated with the I/O functions */
 
 /* Return the user pointer associated with the I/O functions */

-extern PNG_EXPORT(png_voidp,png_get_io_ptr) PNGARG((png_structp png_ptr));
+PNG_EXPORT(79, png_voidp, png_get_io_ptr, (png_structp png_ptr));

 
 

-extern PNG_EXPORT(void,png_set_read_status_fn) PNGARG((png_structp png_ptr,
-   png_read_status_ptr read_row_fn));
+PNG_EXPORT(80, void, png_set_read_status_fn, (png_structp png_ptr,
+    png_read_status_ptr read_row_fn));

 
 

-extern PNG_EXPORT(void,png_set_write_status_fn) PNGARG((png_structp png_ptr,
-   png_write_status_ptr write_row_fn));
+PNG_EXPORT(81, void, png_set_write_status_fn, (png_structp png_ptr,
+    png_write_status_ptr write_row_fn));

 
 #ifdef PNG_USER_MEM_SUPPORTED
 /* Replace the default memory allocation functions with user supplied one(s). */
 
 #ifdef PNG_USER_MEM_SUPPORTED
 /* Replace the default memory allocation functions with user supplied one(s). */

-extern PNG_EXPORT(void,png_set_mem_fn) PNGARG((png_structp png_ptr,
-   png_voidp mem_ptr, png_malloc_ptr malloc_fn, png_free_ptr free_fn));
+PNG_EXPORT(82, void, png_set_mem_fn, (png_structp png_ptr, png_voidp mem_ptr,
+    png_malloc_ptr malloc_fn, png_free_ptr free_fn));

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

-extern PNG_EXPORT(png_voidp,png_get_mem_ptr) PNGARG((png_structp png_ptr));
+PNG_EXPORT(83, png_voidp, png_get_mem_ptr, (png_const_structp png_ptr));

 #endif
 
 #endif
 

-#if defined(PNG_READ_USER_TRANSFORM_SUPPORTED) || \
-    defined(PNG_LEGACY_SUPPORTED)
-extern PNG_EXPORT(void,png_set_read_user_transform_fn) PNGARG((png_structp
-   png_ptr, png_user_transform_ptr read_user_transform_fn));
+#ifdef PNG_READ_USER_TRANSFORM_SUPPORTED
+PNG_EXPORT(84, void, png_set_read_user_transform_fn, (png_structp png_ptr,
+    png_user_transform_ptr read_user_transform_fn));

 #endif
 
 #endif
 

-#if defined(PNG_WRITE_USER_TRANSFORM_SUPPORTED) || \
-    defined(PNG_LEGACY_SUPPORTED)
-extern PNG_EXPORT(void,png_set_write_user_transform_fn) PNGARG((png_structp
-   png_ptr, png_user_transform_ptr write_user_transform_fn));
+#ifdef PNG_WRITE_USER_TRANSFORM_SUPPORTED
+PNG_EXPORT(85, void, png_set_write_user_transform_fn, (png_structp png_ptr,
+    png_user_transform_ptr write_user_transform_fn));

 #endif
 
 #endif
 

-#if defined(PNG_READ_USER_TRANSFORM_SUPPORTED) || \
-    defined(PNG_WRITE_USER_TRANSFORM_SUPPORTED) || \
-    defined(PNG_LEGACY_SUPPORTED)
-extern PNG_EXPORT(void,png_set_user_transform_info) PNGARG((png_structp
-   png_ptr, png_voidp user_transform_ptr, int user_transform_depth,
-   int user_transform_channels));
+#ifdef PNG_USER_TRANSFORM_PTR_SUPPORTED
+PNG_EXPORT(86, void, png_set_user_transform_info, (png_structp png_ptr,
+    png_voidp user_transform_ptr, int user_transform_depth,
+    int user_transform_channels));

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

-extern PNG_EXPORT(png_voidp,png_get_user_transform_ptr)
-   PNGARG((png_structp png_ptr));
+PNG_EXPORT(87, png_voidp, png_get_user_transform_ptr,
+    (png_const_structp png_ptr));
+#endif
+
+#ifdef PNG_USER_TRANSFORM_INFO_SUPPORTED
+/* Return information about the row currently being processed.  Note that these
+ * APIs do not fail but will return unexpected results if called outside a user
+ * transform callback.  Also note that when transforming an interlaced image the
+ * row number is the row number within the sub-image of the interlace pass, so
+ * the value will increase to the height of the sub-image (not the full image)
+ * then reset to 0 for the next pass.
+ *
+ * Use PNG_ROW_FROM_PASS_ROW(row, pass) and PNG_COL_FROM_PASS_COL(col, pass) to
+ * find the output pixel (x,y) given an interlaced sub-image pixel
+ * (row,col,pass).  (See below for these macros.)
+ */
+PNG_EXPORT(217, png_uint_32, png_get_current_row_number, (png_const_structp));
+PNG_EXPORT(218, png_byte, png_get_current_pass_number, (png_const_structp));

 #endif
 
 #ifdef PNG_USER_CHUNKS_SUPPORTED
 #endif
 
 #ifdef PNG_USER_CHUNKS_SUPPORTED

-extern PNG_EXPORT(void,png_set_read_user_chunk_fn) PNGARG((png_structp png_ptr,
-   png_voidp user_chunk_ptr, png_user_chunk_ptr read_user_chunk_fn));
-extern PNG_EXPORT(png_voidp,png_get_user_chunk_ptr) PNGARG((png_structp
-   png_ptr));
+PNG_EXPORT(88, void, png_set_read_user_chunk_fn, (png_structp png_ptr,
+    png_voidp user_chunk_ptr, png_user_chunk_ptr read_user_chunk_fn));
+PNG_EXPORT(89, png_voidp, png_get_user_chunk_ptr, (png_const_structp png_ptr));

 #endif
 
 #ifdef PNG_PROGRESSIVE_READ_SUPPORTED
 /* Sets the function callbacks for the push reader, and a pointer to a
  * user-defined structure available to the callback functions.
  */
 #endif
 
 #ifdef PNG_PROGRESSIVE_READ_SUPPORTED
 /* Sets the function callbacks for the push reader, and a pointer to a
  * user-defined structure available to the callback functions.
  */

-extern PNG_EXPORT(void,png_set_progressive_read_fn) PNGARG((png_structp png_ptr,
-   png_voidp progressive_ptr,
-   png_progressive_info_ptr info_fn, png_progressive_row_ptr row_fn,
-   png_progressive_end_ptr end_fn));
-
-/* returns the user pointer associated with the push read functions */
-extern PNG_EXPORT(png_voidp,png_get_progressive_ptr)
-   PNGARG((png_structp png_ptr));
+PNG_EXPORT(90, void, png_set_progressive_read_fn, (png_structp png_ptr,
+    png_voidp progressive_ptr, png_progressive_info_ptr info_fn,
+    png_progressive_row_ptr row_fn, png_progressive_end_ptr end_fn));
+
+/* Returns the user pointer associated with the push read functions */
+PNG_EXPORT(91, png_voidp, png_get_progressive_ptr, (png_const_structp png_ptr));
+
+/* Function to be called when data becomes available */
+PNG_EXPORT(92, void, png_process_data,
+    (png_structp png_ptr, png_infop info_ptr,
+    png_bytep buffer, png_size_t buffer_size));
+
+/* A function which may be called *only* within png_process_data to stop the
+ * processing of any more data.  The function returns the number of bytes
+ * remaining, excluding any that libpng has cached internally.  A subsequent
+ * call to png_process_data must supply these bytes again.  If the argument
+ * 'save' is set to true the routine will first save all the pending data and
+ * will always return 0.
+ */
+PNG_EXPORT(219, png_size_t, png_process_data_pause, (png_structp, int save));

 
 

-/* function to be called when data becomes available */
-extern PNG_EXPORT(void,png_process_data) PNGARG((png_structp png_ptr,
-   png_infop info_ptr, png_bytep buffer, png_size_t buffer_size));
+/* A function which may be called *only* outside (after) a call to
+ * png_process_data.  It returns the number of bytes of data to skip in the
+ * input.  Normally it will return 0, but if it returns a non-zero value the
+ * application must skip than number of bytes of input data and pass the
+ * following data to the next call to png_process_data.
+ */
+PNG_EXPORT(220, png_uint_32, png_process_data_skip, (png_structp));

 
 

-/* function that combines rows.  Not very much different than the
- * png_combine_row() call.  Is this even used?????
+#ifdef PNG_READ_INTERLACING_SUPPORTED
+/* Function that combines rows.  'new_row' is a flag that should come from
+ * the callback and be non-NULL if anything needs to be done; the library
+ * stores its own version of the new data internally and ignores the passed
+ * in value.

  */
  */

-extern PNG_EXPORT(void,png_progressive_combine_row) PNGARG((png_structp png_ptr,
-   png_bytep old_row, png_bytep new_row));
+PNG_EXPORT(93, void, png_progressive_combine_row, (png_structp png_ptr,
+    png_bytep old_row, png_const_bytep new_row));
+#endif /* PNG_READ_INTERLACING_SUPPORTED */

 #endif /* PNG_PROGRESSIVE_READ_SUPPORTED */
 
 #endif /* PNG_PROGRESSIVE_READ_SUPPORTED */
 

-extern PNG_EXPORT(png_voidp,png_malloc) PNGARG((png_structp png_ptr,
-   png_uint_32 size));
+PNG_EXPORTA(94, png_voidp, png_malloc,
+    (png_structp png_ptr, png_alloc_size_t size),
+    PNG_ALLOCATED);
+/* Added at libpng version 1.4.0 */
+PNG_EXPORTA(95, png_voidp, png_calloc,
+    (png_structp png_ptr, png_alloc_size_t size),
+    PNG_ALLOCATED);

 
 

-#if defined(PNG_1_0_X)
-#  define png_malloc_warn png_malloc
-#else

 /* Added at libpng version 1.2.4 */
 /* Added at libpng version 1.2.4 */

-extern PNG_EXPORT(png_voidp,png_malloc_warn) PNGARG((png_structp png_ptr,
-   png_uint_32 size));
-#endif
-
-/* frees a pointer allocated by png_malloc() */
-extern PNG_EXPORT(void,png_free) PNGARG((png_structp png_ptr, png_voidp ptr));
+PNG_EXPORTA(96, png_voidp, png_malloc_warn, (png_structp png_ptr,
+    png_alloc_size_t size), PNG_ALLOCATED);

 
 

-#if defined(PNG_1_0_X)
-/* Function to allocate memory for zlib. */
-extern PNG_EXPORT(voidpf,png_zalloc) PNGARG((voidpf png_ptr, uInt items,
-   uInt size));
-
-/* Function to free memory for zlib */
-extern PNG_EXPORT(void,png_zfree) PNGARG((voidpf png_ptr, voidpf ptr));
-#endif
+/* Frees a pointer allocated by png_malloc() */
+PNG_EXPORT(97, void, png_free, (png_structp png_ptr, png_voidp ptr));

 
 /* Free data that was allocated internally */
 
 /* Free data that was allocated internally */

-extern PNG_EXPORT(void,png_free_data) PNGARG((png_structp png_ptr,
-   png_infop info_ptr, png_uint_32 free_me, int num));
-#ifdef PNG_FREE_ME_SUPPORTED
+PNG_EXPORT(98, void, png_free_data,
+    (png_structp png_ptr, png_infop info_ptr, png_uint_32 free_me, int num));
+

 /* Reassign responsibility for freeing existing data, whether allocated
  * by libpng or by the application */
 /* Reassign responsibility for freeing existing data, whether allocated
  * by libpng or by the application */

-extern PNG_EXPORT(void,png_data_freer) PNGARG((png_structp png_ptr,
-   png_infop info_ptr, int freer, png_uint_32 mask));
-#endif
-/* assignments for png_data_freer */
+PNG_EXPORT(99, void, png_data_freer,
+    (png_structp png_ptr, png_infop info_ptr, int freer, png_uint_32 mask));
+
+/* Assignments for png_data_freer */

 #define PNG_DESTROY_WILL_FREE_DATA 1
 #define PNG_SET_WILL_FREE_DATA 1
 #define PNG_USER_WILL_FREE_DATA 2
 #define PNG_DESTROY_WILL_FREE_DATA 1
 #define PNG_SET_WILL_FREE_DATA 1
 #define PNG_USER_WILL_FREE_DATA 2


@@ -2113,47 +1909,59 @@ extern PNG_EXPORT(void,png_data_freer) PNGARG((png_structp png_ptr,
 #define PNG_FREE_MUL  0x4220 /* PNG_FREE_SPLT|PNG_FREE_TEXT|PNG_FREE_UNKN */
 
 #ifdef PNG_USER_MEM_SUPPORTED
 #define PNG_FREE_MUL  0x4220 /* PNG_FREE_SPLT|PNG_FREE_TEXT|PNG_FREE_UNKN */
 
 #ifdef PNG_USER_MEM_SUPPORTED

-extern PNG_EXPORT(png_voidp,png_malloc_default) PNGARG((png_structp png_ptr,
-   png_uint_32 size));
-extern PNG_EXPORT(void,png_free_default) PNGARG((png_structp png_ptr,
-   png_voidp ptr));
+PNG_EXPORTA(100, png_voidp, png_malloc_default, (png_structp png_ptr,
+    png_alloc_size_t size), PNG_ALLOCATED);
+PNG_EXPORT(101, void, png_free_default, (png_structp png_ptr, png_voidp ptr));

 #endif
 
 #endif
 

-extern PNG_EXPORT(png_voidp,png_memcpy_check) PNGARG((png_structp png_ptr,
-   png_voidp s1, png_voidp s2, png_uint_32 size));
-
-extern PNG_EXPORT(png_voidp,png_memset_check) PNGARG((png_structp png_ptr,
-   png_voidp s1, int value, png_uint_32 size));
-
-#if defined(USE_FAR_KEYWORD)  /* memory model conversion function */
-extern void *png_far_to_near PNGARG((png_structp png_ptr,png_voidp ptr,
-   int check));
-#endif /* USE_FAR_KEYWORD */
-
-#ifndef PNG_NO_ERROR_TEXT
+#ifdef PNG_ERROR_TEXT_SUPPORTED

 /* 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_message));
+PNG_EXPORTA(102, void, png_error,
+    (png_structp png_ptr, png_const_charp error_message),
+    PNG_NORETURN);

 
 /* The same, but the chunk name is prepended to the error string. */
 
 /* The same, but the chunk name is prepended to the error string. */

-extern PNG_EXPORT(void,png_chunk_error) PNGARG((png_structp png_ptr,
-   png_const_charp error_message));
+PNG_EXPORTA(103, void, png_chunk_error, (png_structp png_ptr,
+    png_const_charp error_message), PNG_NORETURN);
+

 #else
 /* Fatal error in PNG image of libpng - can't continue */
 #else
 /* Fatal error in PNG image of libpng - can't continue */

-extern PNG_EXPORT(void,png_err) PNGARG((png_structp png_ptr));
+PNG_EXPORTA(104, void, png_err, (png_structp png_ptr), PNG_NORETURN);

 #endif
 
 #endif
 

-#ifndef PNG_NO_WARNINGS
+#ifdef PNG_WARNINGS_SUPPORTED

 /* 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 warning_message));
+PNG_EXPORT(105, void, png_warning, (png_structp png_ptr,
+    png_const_charp warning_message));

 
 

-#ifdef PNG_READ_SUPPORTED

 /* 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 warning_message));
-#endif /* PNG_READ_SUPPORTED */
-#endif /* PNG_NO_WARNINGS */
+PNG_EXPORT(106, void, png_chunk_warning, (png_structp png_ptr,
+    png_const_charp warning_message));
+#endif
+
+#ifdef PNG_BENIGN_ERRORS_SUPPORTED
+/* Benign error in libpng.  Can continue, but may have a problem.
+ * User can choose whether to handle as a fatal error or as a warning. */
+#  undef png_benign_error
+PNG_EXPORT(107, void, png_benign_error, (png_structp png_ptr,
+    png_const_charp warning_message));
+
+/* Same, chunk name is prepended to message. */
+#  undef png_chunk_benign_error
+PNG_EXPORT(108, void, png_chunk_benign_error, (png_structp png_ptr,
+    png_const_charp warning_message));
+
+PNG_EXPORT(109, void, png_set_benign_errors,
+    (png_structp png_ptr, int allowed));
+#else
+#  ifdef PNG_ALLOW_BENIGN_ERRORS
+#    define png_benign_error png_warning
+#    define png_chunk_benign_error png_chunk_warning
+#  else
+#    define png_benign_error png_error
+#    define png_chunk_benign_error png_chunk_error
+#  endif
+#endif

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


@@ -2168,468 +1976,416 @@ 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_infop info_ptr, png_uint_32 flag));
+PNG_EXPORT(110, png_uint_32, png_get_valid,
+    (png_const_structp png_ptr, png_const_infop info_ptr,
+    png_uint_32 flag));

 
 /* Returns number of bytes needed to hold a transformed row. */
 
 /* Returns number of bytes needed to hold a transformed row. */

-extern PNG_EXPORT(png_uint_32,png_get_rowbytes) PNGARG((png_structp png_ptr,
-png_infop info_ptr));
+PNG_EXPORT(111, png_size_t, png_get_rowbytes, (png_const_structp png_ptr,
+    png_const_infop info_ptr));

 
 

-#if defined(PNG_INFO_IMAGE_SUPPORTED)
+#ifdef PNG_INFO_IMAGE_SUPPORTED

 /* Returns row_pointers, which is an array of pointers to scanlines that was
 /* Returns row_pointers, which is an array of pointers to scanlines that was

-returned from png_read_png(). */
-extern PNG_EXPORT(png_bytepp,png_get_rows) PNGARG((png_structp png_ptr,
-png_infop info_ptr));
+ * returned from png_read_png().
+ */
+PNG_EXPORT(112, png_bytepp, png_get_rows,
+    (png_const_structp png_ptr, png_const_infop info_ptr));

 /* Set row_pointers, which is an array of pointers to scanlines for use
 /* Set row_pointers, which is an array of pointers to scanlines for use

-by png_write_png(). */
-extern PNG_EXPORT(void,png_set_rows) PNGARG((png_structp png_ptr,
-   png_infop info_ptr, png_bytepp row_pointers));
+ * by png_write_png().
+ */
+PNG_EXPORT(113, void, png_set_rows, (png_structp png_ptr,
+    png_infop info_ptr, png_bytepp row_pointers));

 #endif
 
 /* Returns number of color channels in image. */
 #endif
 
 /* Returns number of color channels in image. */

-extern PNG_EXPORT(png_byte,png_get_channels) PNGARG((png_structp png_ptr,
-png_infop info_ptr));
+PNG_EXPORT(114, png_byte, png_get_channels,
+    (png_const_structp png_ptr, png_const_infop info_ptr));

 
 #ifdef PNG_EASY_ACCESS_SUPPORTED
 /* Returns image width in pixels. */
 
 #ifdef PNG_EASY_ACCESS_SUPPORTED
 /* Returns image width in pixels. */

-extern PNG_EXPORT(png_uint_32, png_get_image_width) PNGARG((png_structp
-png_ptr, png_infop info_ptr));
+PNG_EXPORT(115, png_uint_32, png_get_image_width, (png_const_structp png_ptr,
+    png_const_infop info_ptr));

 
 /* Returns image height in pixels. */
 
 /* Returns image height in pixels. */

-extern PNG_EXPORT(png_uint_32, png_get_image_height) PNGARG((png_structp
-png_ptr, png_infop info_ptr));
+PNG_EXPORT(116, png_uint_32, png_get_image_height, (png_const_structp png_ptr,
+    png_const_infop info_ptr));

 
 /* Returns image bit_depth. */
 
 /* Returns image bit_depth. */

-extern PNG_EXPORT(png_byte, png_get_bit_depth) PNGARG((png_structp
-png_ptr, png_infop info_ptr));
+PNG_EXPORT(117, png_byte, png_get_bit_depth,
+    (png_const_structp png_ptr, png_const_infop info_ptr));

 
 /* Returns image color_type. */
 
 /* Returns image color_type. */

-extern PNG_EXPORT(png_byte, png_get_color_type) PNGARG((png_structp
-png_ptr, png_infop info_ptr));
+PNG_EXPORT(118, png_byte, png_get_color_type, (png_const_structp png_ptr,
+    png_const_infop info_ptr));

 
 /* Returns image filter_type. */
 
 /* Returns image filter_type. */

-extern PNG_EXPORT(png_byte, png_get_filter_type) PNGARG((png_structp
-png_ptr, png_infop info_ptr));
+PNG_EXPORT(119, png_byte, png_get_filter_type, (png_const_structp png_ptr,
+    png_const_infop info_ptr));

 
 /* Returns image interlace_type. */
 
 /* Returns image interlace_type. */

-extern PNG_EXPORT(png_byte, png_get_interlace_type) PNGARG((png_structp
-png_ptr, png_infop info_ptr));
+PNG_EXPORT(120, png_byte, png_get_interlace_type, (png_const_structp png_ptr,
+    png_const_infop info_ptr));

 
 /* Returns image compression_type. */
 
 /* Returns image compression_type. */

-extern PNG_EXPORT(png_byte, png_get_compression_type) PNGARG((png_structp
-png_ptr, png_infop info_ptr));
+PNG_EXPORT(121, png_byte, png_get_compression_type, (png_const_structp png_ptr,
+    png_const_infop info_ptr));

 
 /* Returns image resolution in pixels per meter, from pHYs chunk data. */
 
 /* Returns image resolution in pixels per meter, from pHYs chunk data. */

-extern PNG_EXPORT(png_uint_32, png_get_pixels_per_meter) PNGARG((png_structp
-png_ptr, png_infop info_ptr));
-extern PNG_EXPORT(png_uint_32, png_get_x_pixels_per_meter) PNGARG((png_structp
-png_ptr, png_infop info_ptr));
-extern PNG_EXPORT(png_uint_32, png_get_y_pixels_per_meter) PNGARG((png_structp
-png_ptr, png_infop info_ptr));
+PNG_EXPORT(122, png_uint_32, png_get_pixels_per_meter,
+    (png_const_structp png_ptr, png_const_infop info_ptr));
+PNG_EXPORT(123, png_uint_32, png_get_x_pixels_per_meter,
+    (png_const_structp png_ptr, png_const_infop info_ptr));
+PNG_EXPORT(124, png_uint_32, png_get_y_pixels_per_meter,
+    (png_const_structp png_ptr, png_const_infop info_ptr));

 
 /* Returns pixel aspect ratio, computed from pHYs chunk data.  */
 
 /* Returns pixel aspect ratio, computed from pHYs chunk data.  */

-#ifdef PNG_FLOATING_POINT_SUPPORTED
-extern PNG_EXPORT(float, png_get_pixel_aspect_ratio) PNGARG((png_structp
-png_ptr, png_infop info_ptr));
-#endif
+PNG_FP_EXPORT(125, float, png_get_pixel_aspect_ratio,
+    (png_const_structp png_ptr, png_const_infop info_ptr));
+PNG_FIXED_EXPORT(210, png_fixed_point, png_get_pixel_aspect_ratio_fixed,
+    (png_const_structp png_ptr, png_const_infop info_ptr));

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

-extern PNG_EXPORT(png_int_32, png_get_x_offset_pixels) PNGARG((png_structp
-png_ptr, png_infop info_ptr));
-extern PNG_EXPORT(png_int_32, png_get_y_offset_pixels) PNGARG((png_structp
-png_ptr, png_infop info_ptr));
-extern PNG_EXPORT(png_int_32, png_get_x_offset_microns) PNGARG((png_structp
-png_ptr, png_infop info_ptr));
-extern PNG_EXPORT(png_int_32, png_get_y_offset_microns) PNGARG((png_structp
-png_ptr, png_infop info_ptr));
+PNG_EXPORT(126, png_int_32, png_get_x_offset_pixels,
+    (png_const_structp png_ptr, png_const_infop info_ptr));
+PNG_EXPORT(127, png_int_32, png_get_y_offset_pixels,
+    (png_const_structp png_ptr, png_const_infop info_ptr));
+PNG_EXPORT(128, png_int_32, png_get_x_offset_microns,
+    (png_const_structp png_ptr, png_const_infop info_ptr));
+PNG_EXPORT(129, png_int_32, png_get_y_offset_microns,
+    (png_const_structp png_ptr, png_const_infop info_ptr));

 
 #endif /* PNG_EASY_ACCESS_SUPPORTED */
 
 /* Returns pointer to signature string read from PNG header */
 
 #endif /* PNG_EASY_ACCESS_SUPPORTED */
 
 /* Returns pointer to signature string read from PNG header */

-extern PNG_EXPORT(png_bytep,png_get_signature) PNGARG((png_structp png_ptr,
-png_infop info_ptr));
+PNG_EXPORT(130, png_const_bytep, png_get_signature,
+    (png_const_structp png_ptr, png_infop info_ptr));

 
 

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

 #endif
 
 #endif
 

-#if defined(PNG_bKGD_SUPPORTED)
-extern PNG_EXPORT(void,png_set_bKGD) PNGARG((png_structp png_ptr,
-   png_infop info_ptr, png_color_16p background));
+#ifdef PNG_bKGD_SUPPORTED
+PNG_EXPORT(132, void, png_set_bKGD, (png_structp png_ptr, png_infop info_ptr,
+    png_const_color_16p background));

 #endif
 
 #endif
 

-#if defined(PNG_cHRM_SUPPORTED)
-#ifdef PNG_FLOATING_POINT_SUPPORTED
-extern PNG_EXPORT(png_uint_32,png_get_cHRM) PNGARG((png_structp png_ptr,
-   png_infop info_ptr, double *white_x, double *white_y, double *red_x,
-   double *red_y, double *green_x, double *green_y, double *blue_x,
-   double *blue_y));
-#endif
-#ifdef PNG_FIXED_POINT_SUPPORTED
-extern PNG_EXPORT(png_uint_32,png_get_cHRM_fixed) PNGARG((png_structp png_ptr,
-   png_infop info_ptr, png_fixed_point *int_white_x, png_fixed_point
-   *int_white_y, png_fixed_point *int_red_x, png_fixed_point *int_red_y,
-   png_fixed_point *int_green_x, png_fixed_point *int_green_y, png_fixed_point
-   *int_blue_x, png_fixed_point *int_blue_y));
-#endif
+#ifdef PNG_cHRM_SUPPORTED
+PNG_FP_EXPORT(133, png_uint_32, png_get_cHRM, (png_const_structp png_ptr,
+   png_const_infop info_ptr, double *white_x, double *white_y, double *red_x,
+    double *red_y, double *green_x, double *green_y, double *blue_x,
+    double *blue_y));
+PNG_FP_EXPORT(230, png_uint_32, png_get_cHRM_XYZ, (png_structp png_ptr,
+    png_const_infop info_ptr, double *red_X, double *red_Y, double *red_Z,
+    double *green_X, double *green_Y, double *green_Z, double *blue_X,
+    double *blue_Y, double *blue_Z));
+#ifdef PNG_FIXED_POINT_SUPPORTED /* Otherwise not implemented */
+PNG_FIXED_EXPORT(134, png_uint_32, png_get_cHRM_fixed,
+    (png_const_structp png_ptr,
+    png_const_infop info_ptr, png_fixed_point *int_white_x,
+    png_fixed_point *int_white_y, png_fixed_point *int_red_x,
+    png_fixed_point *int_red_y, png_fixed_point *int_green_x,
+    png_fixed_point *int_green_y, png_fixed_point *int_blue_x,
+    png_fixed_point *int_blue_y));
+#endif
+PNG_FIXED_EXPORT(231, png_uint_32, png_get_cHRM_XYZ_fixed,
+    (png_structp png_ptr, png_const_infop info_ptr,
+    png_fixed_point *int_red_X, png_fixed_point *int_red_Y,
+    png_fixed_point *int_red_Z, png_fixed_point *int_green_X,
+    png_fixed_point *int_green_Y, png_fixed_point *int_green_Z,
+    png_fixed_point *int_blue_X, png_fixed_point *int_blue_Y,
+    png_fixed_point *int_blue_Z));

 #endif
 
 #endif
 

-#if defined(PNG_cHRM_SUPPORTED)
-#ifdef PNG_FLOATING_POINT_SUPPORTED
-extern PNG_EXPORT(void,png_set_cHRM) PNGARG((png_structp png_ptr,
-   png_infop info_ptr, double white_x, double white_y, double red_x,
-   double red_y, double green_x, double green_y, double blue_x, double blue_y));
-#endif
-#ifdef PNG_FIXED_POINT_SUPPORTED
-extern PNG_EXPORT(void,png_set_cHRM_fixed) PNGARG((png_structp png_ptr,
-   png_infop info_ptr, png_fixed_point int_white_x, png_fixed_point int_white_y,
-   png_fixed_point int_red_x, png_fixed_point int_red_y, png_fixed_point
-   int_green_x, png_fixed_point int_green_y, png_fixed_point int_blue_x,
-   png_fixed_point int_blue_y));
-#endif
+#ifdef PNG_cHRM_SUPPORTED
+PNG_FP_EXPORT(135, void, png_set_cHRM,
+    (png_structp png_ptr, png_infop info_ptr,
+    double white_x, double white_y, double red_x, double red_y, double green_x,
+    double green_y, double blue_x, double blue_y));
+PNG_FP_EXPORT(232, void, png_set_cHRM_XYZ, (png_structp png_ptr,
+    png_infop info_ptr, double red_X, double red_Y, double red_Z,
+    double green_X, double green_Y, double green_Z, double blue_X,
+    double blue_Y, double blue_Z));
+PNG_FIXED_EXPORT(136, void, png_set_cHRM_fixed, (png_structp png_ptr,
+    png_infop info_ptr, png_fixed_point int_white_x,
+    png_fixed_point int_white_y, png_fixed_point int_red_x,
+    png_fixed_point int_red_y, png_fixed_point int_green_x,
+    png_fixed_point int_green_y, png_fixed_point int_blue_x,
+    png_fixed_point int_blue_y));
+PNG_FIXED_EXPORT(233, void, png_set_cHRM_XYZ_fixed, (png_structp png_ptr,
+    png_infop info_ptr, png_fixed_point int_red_X, png_fixed_point int_red_Y,
+    png_fixed_point int_red_Z, png_fixed_point int_green_X,
+    png_fixed_point int_green_Y, png_fixed_point int_green_Z,
+    png_fixed_point int_blue_X, png_fixed_point int_blue_Y,
+    png_fixed_point int_blue_Z));

 #endif
 
 #endif
 

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

 #endif
 
 #endif
 

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

 #endif
 
 #endif
 

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

 #endif
 
 #endif
 

-#if defined(PNG_hIST_SUPPORTED)
-extern PNG_EXPORT(void,png_set_hIST) PNGARG((png_structp png_ptr,
-   png_infop info_ptr, png_uint_16p hist));
+#ifdef PNG_hIST_SUPPORTED
+PNG_EXPORT(142, void, png_set_hIST, (png_structp png_ptr,
+    png_infop info_ptr, png_const_uint_16p hist));

 #endif
 
 #endif
 

-extern PNG_EXPORT(png_uint_32,png_get_IHDR) PNGARG((png_structp png_ptr,
-   png_infop info_ptr, png_uint_32 *width, png_uint_32 *height,
-   int *bit_depth, int *color_type, int *interlace_method,
-   int *compression_method, int *filter_method));
+PNG_EXPORT(143, png_uint_32, png_get_IHDR,
+    (png_structp png_ptr, png_infop info_ptr,
+    png_uint_32 *width, png_uint_32 *height, int *bit_depth, int *color_type,
+    int *interlace_method, int *compression_method, int *filter_method));

 
 

-extern PNG_EXPORT(void,png_set_IHDR) PNGARG((png_structp png_ptr,
-   png_infop info_ptr, png_uint_32 width, png_uint_32 height, int bit_depth,
-   int color_type, int interlace_method, int compression_method,
-   int filter_method));
+PNG_EXPORT(144, void, png_set_IHDR,
+    (png_structp png_ptr, png_infop info_ptr,
+    png_uint_32 width, png_uint_32 height, int bit_depth, int color_type,
+    int interlace_method, int compression_method, int filter_method));

 
 

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

 #endif
 
 #endif
 

-#if defined(PNG_oFFs_SUPPORTED)
-extern PNG_EXPORT(void,png_set_oFFs) PNGARG((png_structp png_ptr,
-   png_infop info_ptr, png_int_32 offset_x, png_int_32 offset_y,
-   int unit_type));
+#ifdef PNG_oFFs_SUPPORTED
+PNG_EXPORT(146, void, png_set_oFFs,
+    (png_structp png_ptr, png_infop info_ptr,
+    png_int_32 offset_x, png_int_32 offset_y, int unit_type));

 #endif
 
 #endif
 

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

 #endif
 
 #endif
 

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

 #endif
 
 #endif
 

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

 #endif
 
 #endif
 

-#if defined(PNG_pHYs_SUPPORTED)
-extern PNG_EXPORT(void,png_set_pHYs) PNGARG((png_structp png_ptr,
-   png_infop info_ptr, png_uint_32 res_x, png_uint_32 res_y, int unit_type));
+#ifdef PNG_pHYs_SUPPORTED
+PNG_EXPORT(150, void, png_set_pHYs,
+    (png_structp png_ptr, png_infop info_ptr,
+    png_uint_32 res_x, png_uint_32 res_y, int unit_type));

 #endif
 
 #endif
 

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

 
 

-extern PNG_EXPORT(void,png_set_PLTE) PNGARG((png_structp png_ptr,
-   png_infop info_ptr, png_colorp palette, int num_palette));
+PNG_EXPORT(152, void, png_set_PLTE,
+    (png_structp png_ptr, png_infop info_ptr,
+    png_const_colorp palette, int num_palette));

 
 

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

 #endif
 
 #endif
 

-#if defined(PNG_sBIT_SUPPORTED)
-extern PNG_EXPORT(void,png_set_sBIT) PNGARG((png_structp png_ptr,
-   png_infop info_ptr, png_color_8p sig_bit));
+#ifdef PNG_sBIT_SUPPORTED
+PNG_EXPORT(154, void, png_set_sBIT,
+    (png_structp png_ptr, png_infop info_ptr, png_const_color_8p sig_bit));

 #endif
 
 #endif
 

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

 #endif
 
 #endif
 

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

 #endif
 
 #endif
 

-#if defined(PNG_iCCP_SUPPORTED)
-extern PNG_EXPORT(png_uint_32,png_get_iCCP) PNGARG((png_structp png_ptr,
-   png_infop info_ptr, png_charpp name, int *compression_type,
-   png_charpp profile, png_uint_32 *proflen));
-   /* Note to maintainer: profile should be png_bytepp */
+#ifdef PNG_iCCP_SUPPORTED
+PNG_EXPORT(158, png_uint_32, png_get_iCCP,
+    (png_const_structp png_ptr, png_const_infop info_ptr,
+    png_charpp name, int *compression_type, png_bytepp profile,
+    png_uint_32 *proflen));

 #endif
 
 #endif
 

-#if defined(PNG_iCCP_SUPPORTED)
-extern PNG_EXPORT(void,png_set_iCCP) PNGARG((png_structp png_ptr,
-   png_infop info_ptr, png_charp name, int compression_type,
-   png_charp profile, png_uint_32 proflen));
-   /* Note to maintainer: profile should be png_bytep */
+#ifdef PNG_iCCP_SUPPORTED
+PNG_EXPORT(159, void, png_set_iCCP,
+    (png_structp png_ptr, png_infop info_ptr,
+    png_const_charp name, int compression_type, png_const_bytep profile,
+    png_uint_32 proflen));

 #endif
 
 #endif
 

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

 #endif
 
 #endif
 

-#if defined(PNG_sPLT_SUPPORTED)
-extern PNG_EXPORT(void,png_set_sPLT) PNGARG((png_structp png_ptr,
-   png_infop info_ptr, png_sPLT_tp entries, int nentries));
+#ifdef PNG_sPLT_SUPPORTED
+PNG_EXPORT(161, void, png_set_sPLT,
+    (png_structp png_ptr, png_infop info_ptr,
+    png_const_sPLT_tp entries, int nentries));

 #endif
 
 #endif
 

-#if defined(PNG_TEXT_SUPPORTED)
+#ifdef PNG_TEXT_SUPPORTED

 /* png_get_text also returns the number of text chunks in *num_text */
 /* png_get_text also returns the number of text chunks in *num_text */

-extern PNG_EXPORT(png_uint_32,png_get_text) PNGARG((png_structp png_ptr,
-   png_infop info_ptr, png_textp *text_ptr, int *num_text));
+PNG_EXPORT(162, png_uint_32, png_get_text,
+    (png_const_structp png_ptr, png_const_infop info_ptr,
+    png_textp *text_ptr, int *num_text));

 #endif
 
 #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.
+/* Note while png_set_text() will accept a structure whose text,
+ * language, and  translated keywords are NULL pointers, the structure
+ * returned by png_get_text will always contain regular
+ * zero-terminated C strings.  They might be empty strings but
+ * they will never be NULL pointers.

  */
 
  */
 

-#if defined(PNG_TEXT_SUPPORTED)
-extern PNG_EXPORT(void,png_set_text) PNGARG((png_structp png_ptr,
-   png_infop info_ptr, png_textp text_ptr, int num_text));
-#endif
-
-#if defined(PNG_tIME_SUPPORTED)
-extern PNG_EXPORT(png_uint_32,png_get_tIME) PNGARG((png_structp png_ptr,
-   png_infop info_ptr, png_timep *mod_time));
+#ifdef PNG_TEXT_SUPPORTED
+PNG_EXPORT(163, void, png_set_text,
+    (png_structp png_ptr, png_infop info_ptr,
+    png_const_textp text_ptr, int num_text));

 #endif
 
 #endif
 

-#if defined(PNG_tIME_SUPPORTED)
-extern PNG_EXPORT(void,png_set_tIME) PNGARG((png_structp png_ptr,
-   png_infop info_ptr, png_timep mod_time));
+#ifdef PNG_tIME_SUPPORTED
+PNG_EXPORT(164, png_uint_32, png_get_tIME,
+    (png_const_structp png_ptr, png_infop info_ptr, png_timep *mod_time));

 #endif
 
 #endif
 

-#if defined(PNG_tRNS_SUPPORTED)
-extern PNG_EXPORT(png_uint_32,png_get_tRNS) PNGARG((png_structp png_ptr,
-   png_infop info_ptr, png_bytep *trans, int *num_trans,
-   png_color_16p *trans_values));
+#ifdef PNG_tIME_SUPPORTED
+PNG_EXPORT(165, void, png_set_tIME,
+    (png_structp png_ptr, png_infop info_ptr, png_const_timep mod_time));

 #endif
 
 #endif
 

-#if defined(PNG_tRNS_SUPPORTED)
-extern PNG_EXPORT(void,png_set_tRNS) PNGARG((png_structp png_ptr,
-   png_infop info_ptr, png_bytep trans, int num_trans,
-   png_color_16p trans_values));
+#ifdef PNG_tRNS_SUPPORTED
+PNG_EXPORT(166, png_uint_32, png_get_tRNS,
+    (png_const_structp png_ptr, png_infop info_ptr,
+    png_bytep *trans_alpha, int *num_trans, png_color_16p *trans_color));

 #endif
 
 #endif
 

-#if defined(PNG_tRNS_SUPPORTED)
+#ifdef PNG_tRNS_SUPPORTED
+PNG_EXPORT(167, void, png_set_tRNS,
+    (png_structp png_ptr, png_infop info_ptr,
+    png_const_bytep trans_alpha, int num_trans,
+    png_const_color_16p trans_color));

 #endif
 
 #endif
 

-#if defined(PNG_sCAL_SUPPORTED)
-#ifdef PNG_FLOATING_POINT_SUPPORTED
-extern PNG_EXPORT(png_uint_32,png_get_sCAL) PNGARG((png_structp png_ptr,
-   png_infop info_ptr, int *unit, double *width, double *height));
-#else
-#ifdef PNG_FIXED_POINT_SUPPORTED
-extern PNG_EXPORT(png_uint_32,png_get_sCAL_s) PNGARG((png_structp png_ptr,
-   png_infop info_ptr, int *unit, png_charpp swidth, png_charpp sheight));
-#endif
-#endif
+#ifdef PNG_sCAL_SUPPORTED
+PNG_FP_EXPORT(168, png_uint_32, png_get_sCAL,
+    (png_const_structp png_ptr, png_const_infop info_ptr,
+    int *unit, double *width, double *height));
+#ifdef PNG_FLOATING_ARITHMETIC_SUPPORTED
+/* NOTE: this API is currently implemented using floating point arithmetic,
+ * consequently it can only be used on systems with floating point support.
+ * In any case the range of values supported by png_fixed_point is small and it
+ * is highly recommended that png_get_sCAL_s be used instead.
+ */
+PNG_FIXED_EXPORT(214, png_uint_32, png_get_sCAL_fixed,
+    (png_structp png_ptr, png_const_infop info_ptr, int *unit,
+    png_fixed_point *width,
+    png_fixed_point *height));
+#endif
+PNG_EXPORT(169, png_uint_32, png_get_sCAL_s,
+    (png_const_structp png_ptr, png_const_infop info_ptr,
+    int *unit, png_charpp swidth, png_charpp sheight));
+
+PNG_FP_EXPORT(170, void, png_set_sCAL,
+    (png_structp png_ptr, png_infop info_ptr,
+    int unit, double width, double height));
+PNG_FIXED_EXPORT(213, void, png_set_sCAL_fixed, (png_structp png_ptr,
+   png_infop info_ptr, int unit, png_fixed_point width,
+   png_fixed_point height));
+PNG_EXPORT(171, void, png_set_sCAL_s,
+    (png_structp png_ptr, png_infop info_ptr,
+    int unit, png_const_charp swidth, png_const_charp sheight));

 #endif /* PNG_sCAL_SUPPORTED */
 
 #endif /* PNG_sCAL_SUPPORTED */
 

-#if defined(PNG_sCAL_SUPPORTED)
-#ifdef PNG_FLOATING_POINT_SUPPORTED
-extern PNG_EXPORT(void,png_set_sCAL) PNGARG((png_structp png_ptr,
-   png_infop info_ptr, int unit, double width, double height));
-#else
-#ifdef PNG_FIXED_POINT_SUPPORTED
-extern PNG_EXPORT(void,png_set_sCAL_s) PNGARG((png_structp png_ptr,
-   png_infop info_ptr, int unit, png_charp swidth, png_charp sheight));
-#endif
-#endif
-#endif /* PNG_sCAL_SUPPORTED || PNG_WRITE_sCAL_SUPPORTED */
-
-#if defined(PNG_UNKNOWN_CHUNKS_SUPPORTED)
-/* provide a list of chunks and how they are to be handled, if the built-in
+#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
    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
+   must not be listed.  Because this turns off the default handling for chunks
+   that would otherwise be recognized the behavior of libpng transformations may
+   well become incorrect!
+      keep = 0: PNG_HANDLE_CHUNK_AS_DEFAULT: follow default behavior
+           = 1: PNG_HANDLE_CHUNK_NEVER:      do not keep
+           = 2: PNG_HANDLE_CHUNK_IF_SAFE:    keep only if safe-to-copy
+           = 3: PNG_HANDLE_CHUNK_ALWAYS:     keep even if unsafe-to-copy

 */
 */

-extern PNG_EXPORT(void, png_set_keep_unknown_chunks) PNGARG((png_structp
-   png_ptr, int keep, png_bytep chunk_list, int num_chunks));
-extern PNG_EXPORT(void, png_set_unknown_chunks) PNGARG((png_structp png_ptr,
-   png_infop info_ptr, png_unknown_chunkp unknowns, int num_unknowns));
-extern PNG_EXPORT(void, png_set_unknown_chunk_location)
-   PNGARG((png_structp png_ptr, png_infop info_ptr, int chunk, int location));
-extern PNG_EXPORT(png_uint_32,png_get_unknown_chunks) PNGARG((png_structp
-   png_ptr, png_infop info_ptr, png_unknown_chunkpp entries));
+PNG_EXPORT(172, void, png_set_keep_unknown_chunks,
+    (png_structp png_ptr, int keep,
+    png_const_bytep chunk_list, int num_chunks));
+
+/* The handling code is returned; the result is therefore true (non-zero) if
+ * special handling is required, false for the default handling.
+ */
+PNG_EXPORT(173, int, png_handle_as_unknown, (png_structp png_ptr,
+    png_const_bytep chunk_name));

 #endif
 #endif

-#ifdef PNG_HANDLE_AS_UNKNOWN_SUPPORTED
-PNG_EXPORT(int,png_handle_as_unknown) PNGARG((png_structp png_ptr, png_bytep
-   chunk_name));
+#ifdef PNG_UNKNOWN_CHUNKS_SUPPORTED
+PNG_EXPORT(174, void, png_set_unknown_chunks, (png_structp png_ptr,
+    png_infop info_ptr, png_const_unknown_chunkp unknowns,
+    int num_unknowns));
+PNG_EXPORT(175, void, png_set_unknown_chunk_location,
+    (png_structp png_ptr, png_infop info_ptr, int chunk, int location));
+PNG_EXPORT(176, int, png_get_unknown_chunks, (png_const_structp png_ptr,
+    png_const_infop info_ptr, png_unknown_chunkpp entries));

 #endif
 
 /* Png_free_data() will turn off the "valid" flag for anything it frees.
 #endif
 
 /* Png_free_data() will turn off the "valid" flag for anything it frees.

-   If you need to turn it off for a chunk that your application has freed,
-   you can use png_set_invalid(png_ptr, info_ptr, PNG_INFO_CHNK); */
-extern PNG_EXPORT(void, png_set_invalid) PNGARG((png_structp png_ptr,
-   png_infop info_ptr, int mask));
+ * If 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(177, void, png_set_invalid,
+    (png_structp png_ptr, png_infop info_ptr, int mask));

 
 

-#if defined(PNG_INFO_IMAGE_SUPPORTED)
+#ifdef PNG_INFO_IMAGE_SUPPORTED

 /* The "params" pointer is currently not used and is for future expansion. */
 /* The "params" pointer is currently not used and is for future expansion. */

-extern PNG_EXPORT(void, png_read_png) PNGARG((png_structp png_ptr,
-                        png_infop info_ptr,
-                        int transforms,
-                        png_voidp params));
-extern PNG_EXPORT(void, png_write_png) PNGARG((png_structp png_ptr,
-                        png_infop info_ptr,
-                        int transforms,
-                        png_voidp params));
-#endif
-
-/* Define PNG_DEBUG at compile time for debugging information.  Higher
- * numbers for PNG_DEBUG mean more debugging information.  This has
- * only been added since version 0.95 so it is not implemented throughout
- * libpng yet, but more support will be added as needed.
- */
-#ifdef PNG_DEBUG
-#if (PNG_DEBUG > 0)
-#if !defined(PNG_DEBUG_FILE) && defined(_MSC_VER)
-#include <crtdbg.h>
-#if (PNG_DEBUG > 1)
-#ifndef _DEBUG
-#  define _DEBUG
-#endif
-#ifndef png_debug
-#define png_debug(l,m)  _RPT0(_CRT_WARN,m PNG_STRING_NEWLINE)
-#endif
-#ifndef png_debug1
-#define png_debug1(l,m,p1)  _RPT1(_CRT_WARN,m PNG_STRING_NEWLINE,p1)
-#endif
-#ifndef png_debug2
-#define png_debug2(l,m,p1,p2) _RPT2(_CRT_WARN,m PNG_STRING_NEWLINE,p1,p2)
-#endif
-#endif
-#else /* PNG_DEBUG_FILE || !_MSC_VER */
-#ifndef PNG_DEBUG_FILE
-#define PNG_DEBUG_FILE stderr
-#endif /* PNG_DEBUG_FILE */
-#if (PNG_DEBUG > 1)
-#ifndef png_debug
-/* Note: ["%s"m PNG_STRING_NEWLINE] probably does not work on
- * non-ISO compilers */
-#ifdef __STDC__
-#define png_debug(l,m) \
-{ \
-     int num_tabs=l; \
-     fprintf(PNG_DEBUG_FILE,"%s"m PNG_STRING_NEWLINE,(num_tabs==1 ? "\t" : \
-       (num_tabs==2 ? "\t\t":(num_tabs>2 ? "\t\t\t":"")))); \
-}
-#endif
-#ifndef png_debug1
-#define png_debug1(l,m,p1) \
-{ \
-     int num_tabs=l; \
-     fprintf(PNG_DEBUG_FILE,"%s"m PNG_STRING_NEWLINE,(num_tabs==1 ? "\t" : \
-       (num_tabs==2 ? "\t\t":(num_tabs>2 ? "\t\t\t":""))),p1); \
-}
-#endif
-#ifndef png_debug2
-#define png_debug2(l,m,p1,p2) \
-{ \
-     int num_tabs=l; \
-     fprintf(PNG_DEBUG_FILE,"%s"m PNG_STRING_NEWLINE,(num_tabs==1 ? "\t" : \
-       (num_tabs==2 ? "\t\t":(num_tabs>2 ? "\t\t\t":""))),p1,p2); \
-}
+PNG_EXPORT(178, void, png_read_png, (png_structp png_ptr, png_infop info_ptr,
+    int transforms, png_voidp params));
+PNG_EXPORT(179, void, png_write_png, (png_structp png_ptr, png_infop info_ptr,
+    int transforms, png_voidp params));

 #endif
 #endif

-#else /* __STDC __ */
-#ifndef png_debug
-#define png_debug(l,m) \
-     int num_tabs=l; \
-     char format[256]; \
-     snprintf(format,256,"%s%s%s",(num_tabs==1 ? "\t" : \
-       (num_tabs==2 ? "\t\t":(num_tabs>2 ? "\t\t\t":""))), \
-       m,PNG_STRING_NEWLINE); \
-     fprintf(PNG_DEBUG_FILE,format);
-#endif
-#ifndef png_debug1
-#define png_debug1(l,m,p1) \
-     int num_tabs=l; \
-     char format[256]; \
-     snprintf(format,256,"%s%s%s",(num_tabs==1 ? "\t" : \
-       (num_tabs==2 ? "\t\t":(num_tabs>2 ? "\t\t\t":""))), \
-       m,PNG_STRING_NEWLINE); \
-     fprintf(PNG_DEBUG_FILE,format,p1);
-#endif
-#ifndef png_debug2
-#define png_debug2(l,m,p1,p2) \
-     int num_tabs=l; \
-     char format[256]; \
-     snprintf(format,256,"%s%s%s",(num_tabs==1 ? "\t" : \
-       (num_tabs==2 ? "\t\t":(num_tabs>2 ? "\t\t\t":""))), \
-       m,PNG_STRING_NEWLINE); \
-     fprintf(PNG_DEBUG_FILE,format,p1,p2);
-#endif
-#endif /* __STDC __ */
-#endif /* (PNG_DEBUG > 1) */
-#endif /* _MSC_VER */
-#endif /* (PNG_DEBUG > 0) */
-#endif /* PNG_DEBUG */
-#ifndef png_debug
-#define png_debug(l, m)
-#endif
-#ifndef png_debug1
-#define png_debug1(l, m, p1)
-#endif
-#ifndef png_debug2
-#define png_debug2(l, m, p1, p2)
-#endif
-
-extern PNG_EXPORT(png_charp,png_get_copyright) PNGARG((png_structp png_ptr));
-extern PNG_EXPORT(png_charp,png_get_header_ver) PNGARG((png_structp png_ptr));
-extern PNG_EXPORT(png_charp,png_get_header_version) PNGARG((png_structp png_ptr));
-extern PNG_EXPORT(png_charp,png_get_libpng_ver) PNGARG((png_structp png_ptr));
+
+PNG_EXPORT(180, png_const_charp, png_get_copyright,
+    (png_const_structp png_ptr));
+PNG_EXPORT(181, png_const_charp, png_get_header_ver,
+    (png_const_structp png_ptr));
+PNG_EXPORT(182, png_const_charp, png_get_header_version,
+    (png_const_structp png_ptr));
+PNG_EXPORT(183, png_const_charp, png_get_libpng_ver,
+    (png_const_structp png_ptr));

 
 #ifdef PNG_MNG_FEATURES_SUPPORTED
 
 #ifdef PNG_MNG_FEATURES_SUPPORTED

-extern PNG_EXPORT(png_uint_32,png_permit_mng_features) PNGARG((png_structp
-   png_ptr, png_uint_32 mng_features_permitted));
+PNG_EXPORT(184, png_uint_32, png_permit_mng_features, (png_structp png_ptr,
+    png_uint_32 mng_features_permitted));

 #endif
 
 /* For use in png_set_keep_unknown, added to version 1.2.6 */
 #endif
 
 /* For use in png_set_keep_unknown, added to version 1.2.6 */


@@ -2638,94 +2394,148 @@ extern PNG_EXPORT(png_uint_32,png_permit_mng_features) PNGARG((png_structp
 #define PNG_HANDLE_CHUNK_IF_SAFE      2
 #define PNG_HANDLE_CHUNK_ALWAYS       3
 
 #define PNG_HANDLE_CHUNK_IF_SAFE      2
 #define PNG_HANDLE_CHUNK_ALWAYS       3
 

-/* Added to version 1.2.0 */
-#if defined(PNG_ASSEMBLER_CODE_SUPPORTED)
-#if defined(PNG_MMX_CODE_SUPPORTED)
-#define PNG_ASM_FLAG_MMX_SUPPORT_COMPILED  0x01  /* not user-settable */
-#define PNG_ASM_FLAG_MMX_SUPPORT_IN_CPU    0x02  /* not user-settable */
-#define PNG_ASM_FLAG_MMX_READ_COMBINE_ROW  0x04
-#define PNG_ASM_FLAG_MMX_READ_INTERLACE    0x08
-#define PNG_ASM_FLAG_MMX_READ_FILTER_SUB   0x10
-#define PNG_ASM_FLAG_MMX_READ_FILTER_UP    0x20
-#define PNG_ASM_FLAG_MMX_READ_FILTER_AVG   0x40
-#define PNG_ASM_FLAG_MMX_READ_FILTER_PAETH 0x80
-#define PNG_ASM_FLAGS_INITIALIZED          0x80000000  /* not user-settable */
-
-#define PNG_MMX_READ_FLAGS ( PNG_ASM_FLAG_MMX_READ_COMBINE_ROW  \
-                           | PNG_ASM_FLAG_MMX_READ_INTERLACE    \
-                           | PNG_ASM_FLAG_MMX_READ_FILTER_SUB   \
-                           | PNG_ASM_FLAG_MMX_READ_FILTER_UP    \
-                           | PNG_ASM_FLAG_MMX_READ_FILTER_AVG   \
-                           | PNG_ASM_FLAG_MMX_READ_FILTER_PAETH )
-#define PNG_MMX_WRITE_FLAGS ( 0 )
-
-#define PNG_MMX_FLAGS ( PNG_ASM_FLAG_MMX_SUPPORT_COMPILED \
-                      | PNG_ASM_FLAG_MMX_SUPPORT_IN_CPU   \
-                      | PNG_MMX_READ_FLAGS                \
-                      | PNG_MMX_WRITE_FLAGS )
-
-#define PNG_SELECT_READ   1
-#define PNG_SELECT_WRITE  2
-#endif /* PNG_MMX_CODE_SUPPORTED */
-
-#if !defined(PNG_1_0_X)
-/* pngget.c */
-extern PNG_EXPORT(png_uint_32,png_get_mmx_flagmask)
-   PNGARG((int flag_select, int *compilerID));
-
-/* pngget.c */
-extern PNG_EXPORT(png_uint_32,png_get_asm_flagmask)
-   PNGARG((int flag_select));
-
-/* pngget.c */
-extern PNG_EXPORT(png_uint_32,png_get_asm_flags)
-   PNGARG((png_structp png_ptr));
-
-/* pngget.c */
-extern PNG_EXPORT(png_byte,png_get_mmx_bitdepth_threshold)
-   PNGARG((png_structp png_ptr));
-
-/* pngget.c */
-extern PNG_EXPORT(png_uint_32,png_get_mmx_rowbytes_threshold)
-   PNGARG((png_structp png_ptr));
-
-/* pngset.c */
-extern PNG_EXPORT(void,png_set_asm_flags)
-   PNGARG((png_structp png_ptr, png_uint_32 asm_flags));
-
-/* pngset.c */
-extern PNG_EXPORT(void,png_set_mmx_thresholds)
-   PNGARG((png_structp png_ptr, png_byte mmx_bitdepth_threshold,
-   png_uint_32 mmx_rowbytes_threshold));
-
-#endif /* PNG_1_0_X */
-
-#if !defined(PNG_1_0_X)
-/* png.c, pnggccrd.c, or pngvcrd.c */
-extern PNG_EXPORT(int,png_mmx_support) PNGARG((void));
-#endif /* PNG_ASSEMBLER_CODE_SUPPORTED */
-

 /* Strip the prepended error numbers ("#nnn ") from error and warning
 /* Strip the prepended error numbers ("#nnn ") from error and warning

- * messages before passing them to the error or warning handler. */
+ * messages before passing them to the error or warning handler.
+ */

 #ifdef PNG_ERROR_NUMBERS_SUPPORTED
 #ifdef PNG_ERROR_NUMBERS_SUPPORTED

-extern PNG_EXPORT(void,png_set_strip_error_numbers) PNGARG((png_structp
-   png_ptr, png_uint_32 strip_mode));
+PNG_EXPORT(185, void, png_set_strip_error_numbers,
+    (png_structp png_ptr,
+    png_uint_32 strip_mode));

 #endif
 
 #endif
 

-#endif /* PNG_1_0_X */
-
-/* Added at libpng-1.2.6 */
+/* Added in libpng-1.2.6 */

 #ifdef PNG_SET_USER_LIMITS_SUPPORTED
 #ifdef PNG_SET_USER_LIMITS_SUPPORTED

-extern PNG_EXPORT(void,png_set_user_limits) PNGARG((png_structp
-   png_ptr, png_uint_32 user_width_max, png_uint_32 user_height_max));
-extern PNG_EXPORT(png_uint_32,png_get_user_width_max) PNGARG((png_structp
-   png_ptr));
-extern PNG_EXPORT(png_uint_32,png_get_user_height_max) PNGARG((png_structp
-   png_ptr));
-#endif
+PNG_EXPORT(186, void, png_set_user_limits, (png_structp png_ptr,
+    png_uint_32 user_width_max, png_uint_32 user_height_max));
+PNG_EXPORT(187, png_uint_32, png_get_user_width_max,
+    (png_const_structp png_ptr));
+PNG_EXPORT(188, png_uint_32, png_get_user_height_max,
+    (png_const_structp png_ptr));
+/* Added in libpng-1.4.0 */
+PNG_EXPORT(189, void, png_set_chunk_cache_max, (png_structp png_ptr,
+    png_uint_32 user_chunk_cache_max));
+PNG_EXPORT(190, png_uint_32, png_get_chunk_cache_max,
+    (png_const_structp png_ptr));
+/* Added in libpng-1.4.1 */
+PNG_EXPORT(191, void, png_set_chunk_malloc_max, (png_structp png_ptr,
+    png_alloc_size_t user_chunk_cache_max));
+PNG_EXPORT(192, png_alloc_size_t, png_get_chunk_malloc_max,
+    (png_const_structp png_ptr));
+#endif
+
+#if defined(PNG_INCH_CONVERSIONS_SUPPORTED)
+PNG_EXPORT(193, png_uint_32, png_get_pixels_per_inch,
+    (png_const_structp png_ptr, png_const_infop info_ptr));
+
+PNG_EXPORT(194, png_uint_32, png_get_x_pixels_per_inch,
+    (png_const_structp png_ptr, png_const_infop info_ptr));
+
+PNG_EXPORT(195, png_uint_32, png_get_y_pixels_per_inch,
+    (png_const_structp png_ptr, png_const_infop info_ptr));
+
+PNG_FP_EXPORT(196, float, png_get_x_offset_inches,
+    (png_const_structp png_ptr, png_const_infop info_ptr));
+#ifdef PNG_FIXED_POINT_SUPPORTED /* otherwise not implemented. */
+PNG_FIXED_EXPORT(211, png_fixed_point, png_get_x_offset_inches_fixed,
+    (png_structp png_ptr, png_const_infop info_ptr));
+#endif
+
+PNG_FP_EXPORT(197, float, png_get_y_offset_inches, (png_const_structp png_ptr,
+    png_const_infop info_ptr));
+#ifdef PNG_FIXED_POINT_SUPPORTED /* otherwise not implemented. */
+PNG_FIXED_EXPORT(212, png_fixed_point, png_get_y_offset_inches_fixed,
+    (png_structp png_ptr, png_const_infop info_ptr));
+#endif
+
+#  ifdef PNG_pHYs_SUPPORTED
+PNG_EXPORT(198, png_uint_32, png_get_pHYs_dpi, (png_const_structp png_ptr,
+    png_const_infop info_ptr, png_uint_32 *res_x, png_uint_32 *res_y,
+    int *unit_type));
+#  endif /* PNG_pHYs_SUPPORTED */
+#endif  /* PNG_INCH_CONVERSIONS_SUPPORTED */
+
+/* Added in libpng-1.4.0 */
+#ifdef PNG_IO_STATE_SUPPORTED
+PNG_EXPORT(199, png_uint_32, png_get_io_state, (png_structp png_ptr));
+
+PNG_EXPORTA(200, png_const_bytep, png_get_io_chunk_name,
+    (png_structp png_ptr), PNG_DEPRECATED);
+PNG_EXPORT(216, png_uint_32, png_get_io_chunk_type,
+    (png_const_structp png_ptr));
+
+/* The flags returned by png_get_io_state() are the following: */
+#  define PNG_IO_NONE        0x0000   /* no I/O at this moment */
+#  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 */
+
+/* Interlace support.  The following macros are always defined so that if
+ * libpng interlace handling is turned off the macros may be used to handle
+ * interlaced images within the application.
+ */
+#define PNG_INTERLACE_ADAM7_PASSES 7
+
+/* Two macros to return the first row and first column of the original,
+ * full, image which appears in a given pass.  'pass' is in the range 0
+ * to 6 and the result is in the range 0 to 7.
+ */
+#define PNG_PASS_START_ROW(pass) (((1&~(pass))<<(3-((pass)>>1)))&7)
+#define PNG_PASS_START_COL(pass) (((1& (pass))<<(3-(((pass)+1)>>1)))&7)

 
 

+/* A macro to return the offset between pixels in the output row for a pair of
+ * pixels in the input - effectively the inverse of the 'COL_SHIFT' macro that
+ * follows.  Note that ROW_OFFSET is the offset from one row to the next whereas
+ * COL_OFFSET is from one column to the next, within a row.
+ */
+#define PNG_PASS_ROW_OFFSET(pass) ((pass)>2?(8>>(((pass)-1)>>1)):8)
+#define PNG_PASS_COL_OFFSET(pass) (1<<((7-(pass))>>1))

 
 

-/* Maintainer: Put new public prototypes here ^, in libpng.3, and project defs */
+/* Two macros to help evaluate the number of rows or columns in each
+ * pass.  This is expressed as a shift - effectively log2 of the number or
+ * rows or columns in each 8x8 tile of the original image.
+ */
+#define PNG_PASS_ROW_SHIFT(pass) ((pass)>2?(8-(pass))>>1:3)
+#define PNG_PASS_COL_SHIFT(pass) ((pass)>1?(7-(pass))>>1:3)
+
+/* Hence two macros to determine the number of rows or columns in a given
+ * pass of an image given its height or width.  In fact these macros may
+ * return non-zero even though the sub-image is empty, because the other
+ * dimension may be empty for a small image.
+ */
+#define PNG_PASS_ROWS(height, pass) (((height)+(((1<<PNG_PASS_ROW_SHIFT(pass))\
+   -1)-PNG_PASS_START_ROW(pass)))>>PNG_PASS_ROW_SHIFT(pass))
+#define PNG_PASS_COLS(width, pass) (((width)+(((1<<PNG_PASS_COL_SHIFT(pass))\
+   -1)-PNG_PASS_START_COL(pass)))>>PNG_PASS_COL_SHIFT(pass))
+
+/* For the reader row callbacks (both progressive and sequential) it is
+ * necessary to find the row in the output image given a row in an interlaced
+ * image, so two more macros:
+ */
+#define PNG_ROW_FROM_PASS_ROW(yIn, pass) \
+   (((yIn)<<PNG_PASS_ROW_SHIFT(pass))+PNG_PASS_START_ROW(pass))
+#define PNG_COL_FROM_PASS_COL(xIn, pass) \
+   (((xIn)<<PNG_PASS_COL_SHIFT(pass))+PNG_PASS_START_COL(pass))
+
+/* Two macros which return a boolean (0 or 1) saying whether the given row
+ * or column is in a particular pass.  These use a common utility macro that
+ * returns a mask for a given pass - the offset 'off' selects the row or
+ * column version.  The mask has the appropriate bit set for each column in
+ * the tile.
+ */
+#define PNG_PASS_MASK(pass,off) ( \
+   ((0x110145AF>>(((7-(off))-(pass))<<2)) & 0xF) | \
+   ((0x01145AF0>>(((7-(off))-(pass))<<2)) & 0xF0))
+
+#define PNG_ROW_IN_INTERLACE_PASS(y, pass) \
+   ((PNG_PASS_MASK(pass,0) >> ((y)&7)) & 1)
+#define PNG_COL_IN_INTERLACE_PASS(x, pass) \
+   ((PNG_PASS_MASK(pass,1) >> ((x)&7)) & 1)

 
 #ifdef PNG_READ_COMPOSITE_NODIV_SUPPORTED
 /* With these routines we avoid an integer divide, which will be slower on
 
 #ifdef PNG_READ_COMPOSITE_NODIV_SUPPORTED
 /* With these routines we avoid an integer divide, which will be slower on


@@ -2740,922 +2550,103 @@ extern PNG_EXPORT(png_uint_32,png_get_user_height_max) PNGARG((png_structp
  * [Optimized code by Greg Roelofs and Mark Adler...blame us for bugs. :-) ]
  */
 
  * [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          */
+ /* fg and bg should be in `gamma 1.0' space; alpha is the opacity */

 
 

-#  define png_composite(composite, fg, alpha, bg)                            \
-     { png_uint_16 temp = (png_uint_16)((png_uint_16)(fg) * (png_uint_16)(alpha) \
-                        +        (png_uint_16)(bg)*(png_uint_16)(255 -       \
-                        (png_uint_16)(alpha)) + (png_uint_16)128);           \
+#  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)) + 128);                \

        (composite) = (png_byte)((temp + (temp >> 8)) >> 8); }
 
        (composite) = (png_byte)((temp + (temp >> 8)) >> 8); }
 

-#  define png_composite_16(composite, fg, alpha, bg)                         \
-     { png_uint_32 temp = (png_uint_32)((png_uint_32)(fg) * (png_uint_32)(alpha) \
-                        + (png_uint_32)(bg)*(png_uint_32)(65535L -           \
-                        (png_uint_32)(alpha)) + (png_uint_32)32768L);        \
+#  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)*(65535                      \
+           - (png_uint_32)(alpha)) + 32768);               \

        (composite) = (png_uint_16)((temp + (temp >> 16)) >> 16); }
 
        (composite) = (png_uint_16)((temp + (temp >> 16)) >> 16); }
 

-#else  /* standard method using integer division */
+#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(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)) +       \
+     127) / 255)

 
 #  define png_composite_16(composite, fg, alpha, bg)                         \
      (composite) = (png_uint_16)(((png_uint_32)(fg) * (png_uint_32)(alpha) + \
 
 #  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)
-
+     (png_uint_32)(bg)*(png_uint_32)(65535 - (png_uint_32)(alpha)) +         \
+     32767) / 65535)

 #endif /* PNG_READ_COMPOSITE_NODIV_SUPPORTED */
 
 #endif /* PNG_READ_COMPOSITE_NODIV_SUPPORTED */
 

-/* Inline macros to do direct reads of bytes from the input buffer.  These
- * require that you are using an architecture that uses PNG byte ordering
- * (MSB first) and supports unaligned data storage.  I think that PowerPC
- * in big-endian mode and 680x0 are the only ones that will support this.
- * The x86 line of processors definitely do not.  The png_get_int_32()
- * routine also assumes we are using two's complement format for negative
- * values, which is almost certainly true.
- */
-#if defined(PNG_READ_BIG_ENDIAN_SUPPORTED)
-#  define png_get_uint_32(buf) ( *((png_uint_32p) (buf)))
-#  define png_get_uint_16(buf) ( *((png_uint_16p) (buf)))
-#  define png_get_int_32(buf)  ( *((png_int_32p)  (buf)))
-#else
-extern PNG_EXPORT(png_uint_32,png_get_uint_32) PNGARG((png_bytep buf));
-extern PNG_EXPORT(png_uint_16,png_get_uint_16) PNGARG((png_bytep buf));
-extern PNG_EXPORT(png_int_32,png_get_int_32) PNGARG((png_bytep buf));
-#endif /* !PNG_READ_BIG_ENDIAN_SUPPORTED */
-extern PNG_EXPORT(png_uint_32,png_get_uint_31)
-  PNGARG((png_structp png_ptr, png_bytep buf));
+#ifdef PNG_READ_INT_FUNCTIONS_SUPPORTED
+PNG_EXPORT(201, png_uint_32, png_get_uint_32, (png_const_bytep buf));
+PNG_EXPORT(202, png_uint_16, png_get_uint_16, (png_const_bytep buf));
+PNG_EXPORT(203, png_int_32, png_get_int_32, (png_const_bytep buf));
+#endif
+
+PNG_EXPORT(204, png_uint_32, png_get_uint_31, (png_structp png_ptr,
+    png_const_bytep buf));

 /* No png_get_int_16 -- may be added if there's a real need for it. */
 
 /* No png_get_int_16 -- may be added if there's a real need for it. */
 

-/* Place a 32-bit number into a buffer in PNG byte order (big-endian).
- */
-extern PNG_EXPORT(void,png_save_uint_32)
-   PNGARG((png_bytep buf, png_uint_32 i));
-extern PNG_EXPORT(void,png_save_int_32)
-   PNGARG((png_bytep buf, png_int_32 i));
+/* Place a 32-bit number into a buffer in PNG byte order (big-endian). */
+#ifdef PNG_WRITE_INT_FUNCTIONS_SUPPORTED
+PNG_EXPORT(205, void, png_save_uint_32, (png_bytep buf, png_uint_32 i));
+#endif
+#ifdef PNG_SAVE_INT_32_SUPPORTED
+PNG_EXPORT(206, void, png_save_int_32, (png_bytep buf, png_int_32 i));
+#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.
  */
 
 /* Place a 16-bit number into a buffer in PNG byte order.
  * The parameter is declared unsigned int, not png_uint_16,
  * just to avoid potential problems on pre-ANSI C compilers.
  */

-extern PNG_EXPORT(void,png_save_uint_16)
-   PNGARG((png_bytep buf, unsigned int i));
+#ifdef PNG_WRITE_INT_FUNCTIONS_SUPPORTED
+PNG_EXPORT(207, void, png_save_uint_16, (png_bytep buf, unsigned int i));

 /* No png_save_int_16 -- may be added if there's a real need for it. */
 /* No png_save_int_16 -- may be added if there's a real need for it. */

-
-/* ************************************************************************* */
-
-/* These next functions are used internally in the code.  They generally
- * shouldn't be used unless you are writing code to add or replace some
- * functionality in libpng.  More information about most functions can
- * be found in the files where the functions are located.
- */
-
-
-/* Various modes of operation, that are visible to applications because
- * they are used for unknown chunk location.
- */
-#define PNG_HAVE_IHDR               0x01
-#define PNG_HAVE_PLTE               0x02
-#define PNG_HAVE_IDAT               0x04
-#define PNG_AFTER_IDAT              0x08 /* Have complete zlib datastream */
-#define PNG_HAVE_IEND               0x10
-
-#if defined(PNG_INTERNAL)
-
-/* More modes of operation.  Note that after an init, mode is set to
- * zero automatically when the structure is created.
- */
-#define PNG_HAVE_gAMA               0x20
-#define PNG_HAVE_cHRM               0x40
-#define PNG_HAVE_sRGB               0x80
-#define PNG_HAVE_CHUNK_HEADER      0x100
-#define PNG_WROTE_tIME             0x200
-#define PNG_WROTE_INFO_BEFORE_PLTE 0x400
-#define PNG_BACKGROUND_IS_GRAY     0x800
-#define PNG_HAVE_PNG_SIGNATURE    0x1000
-#define PNG_HAVE_CHUNK_AFTER_IDAT 0x2000 /* Have another chunk after IDAT */
-
-/* flags for the transformations the PNG library does on the image data */
-#define PNG_BGR                0x0001
-#define PNG_INTERLACE          0x0002
-#define PNG_PACK               0x0004
-#define PNG_SHIFT              0x0008
-#define PNG_SWAP_BYTES         0x0010
-#define PNG_INVERT_MONO        0x0020
-#define PNG_DITHER             0x0040
-#define PNG_BACKGROUND         0x0080
-#define PNG_BACKGROUND_EXPAND  0x0100
-                          /*   0x0200 unused */
-#define PNG_16_TO_8            0x0400
-#define PNG_RGBA               0x0800
-#define PNG_EXPAND             0x1000
-#define PNG_GAMMA              0x2000
-#define PNG_GRAY_TO_RGB        0x4000
-#define PNG_FILLER             0x8000L
-#define PNG_PACKSWAP          0x10000L
-#define PNG_SWAP_ALPHA        0x20000L
-#define PNG_STRIP_ALPHA       0x40000L
-#define PNG_INVERT_ALPHA      0x80000L
-#define PNG_USER_TRANSFORM   0x100000L
-#define PNG_RGB_TO_GRAY_ERR  0x200000L
-#define PNG_RGB_TO_GRAY_WARN 0x400000L
-#define PNG_RGB_TO_GRAY      0x600000L  /* two bits, RGB_TO_GRAY_ERR|WARN */
-                       /*    0x800000L     Unused */
-#define PNG_ADD_ALPHA       0x1000000L  /* Added to libpng-1.2.7 */
-#define PNG_EXPAND_tRNS     0x2000000L  /* Added to libpng-1.2.9 */
-                       /*   0x4000000L  unused */
-                       /*   0x8000000L  unused */
-                       /*  0x10000000L  unused */
-                       /*  0x20000000L  unused */
-                       /*  0x40000000L  unused */
-
-/* flags for png_create_struct */
-#define PNG_STRUCT_PNG   0x0001
-#define PNG_STRUCT_INFO  0x0002
-
-/* Scaling factor for filter heuristic weighting calculations */
-#define PNG_WEIGHT_SHIFT 8
-#define PNG_WEIGHT_FACTOR (1<<(PNG_WEIGHT_SHIFT))
-#define PNG_COST_SHIFT 3
-#define PNG_COST_FACTOR (1<<(PNG_COST_SHIFT))
-
-/* flags for the png_ptr->flags rather than declaring a byte for each one */
-#define PNG_FLAG_ZLIB_CUSTOM_STRATEGY     0x0001
-#define PNG_FLAG_ZLIB_CUSTOM_LEVEL        0x0002
-#define PNG_FLAG_ZLIB_CUSTOM_MEM_LEVEL    0x0004
-#define PNG_FLAG_ZLIB_CUSTOM_WINDOW_BITS  0x0008
-#define PNG_FLAG_ZLIB_CUSTOM_METHOD       0x0010
-#define PNG_FLAG_ZLIB_FINISHED            0x0020
-#define PNG_FLAG_ROW_INIT                 0x0040
-#define PNG_FLAG_FILLER_AFTER             0x0080
-#define PNG_FLAG_CRC_ANCILLARY_USE        0x0100
-#define PNG_FLAG_CRC_ANCILLARY_NOWARN     0x0200
-#define PNG_FLAG_CRC_CRITICAL_USE         0x0400
-#define PNG_FLAG_CRC_CRITICAL_IGNORE      0x0800
-#define PNG_FLAG_FREE_PLTE                0x1000
-#define PNG_FLAG_FREE_TRNS                0x2000
-#define PNG_FLAG_FREE_HIST                0x4000
-#define PNG_FLAG_KEEP_UNKNOWN_CHUNKS      0x8000L
-#define PNG_FLAG_KEEP_UNSAFE_CHUNKS       0x10000L
-#define PNG_FLAG_LIBRARY_MISMATCH         0x20000L
-#define PNG_FLAG_STRIP_ERROR_NUMBERS      0x40000L
-#define PNG_FLAG_STRIP_ERROR_TEXT         0x80000L
-#define PNG_FLAG_MALLOC_NULL_MEM_OK       0x100000L
-#define PNG_FLAG_ADD_ALPHA                0x200000L  /* Added to libpng-1.2.8 */
-#define PNG_FLAG_STRIP_ALPHA              0x400000L  /* Added to libpng-1.2.8 */
-                                  /*      0x800000L  unused */
-                                  /*     0x1000000L  unused */
-                                  /*     0x2000000L  unused */
-                                  /*     0x4000000L  unused */
-                                  /*     0x8000000L  unused */
-                                  /*    0x10000000L  unused */
-                                  /*    0x20000000L  unused */
-                                  /*    0x40000000L  unused */
-
-#define PNG_FLAG_CRC_ANCILLARY_MASK (PNG_FLAG_CRC_ANCILLARY_USE | \
-                                     PNG_FLAG_CRC_ANCILLARY_NOWARN)
-
-#define PNG_FLAG_CRC_CRITICAL_MASK  (PNG_FLAG_CRC_CRITICAL_USE | \
-                                     PNG_FLAG_CRC_CRITICAL_IGNORE)
-
-#define PNG_FLAG_CRC_MASK           (PNG_FLAG_CRC_ANCILLARY_MASK | \
-                                     PNG_FLAG_CRC_CRITICAL_MASK)
-
-/* save typing and make code easier to understand */
-
-#define PNG_COLOR_DIST(c1, c2) (abs((int)((c1).red) - (int)((c2).red)) + \
-   abs((int)((c1).green) - (int)((c2).green)) + \
-   abs((int)((c1).blue) - (int)((c2).blue)))
-
-/* Added to libpng-1.2.6 JB */
-#define PNG_ROWBYTES(pixel_bits, width) \
-    ((pixel_bits) >= 8 ? \
-    ((width) * (((png_uint_32)(pixel_bits)) >> 3)) : \
-    (( ((width) * ((png_uint_32)(pixel_bits))) + 7) >> 3) )
-
-/* PNG_OUT_OF_RANGE returns true if value is outside the range
-   ideal-delta..ideal+delta.  Each argument is evaluated twice.
-   "ideal" and "delta" should be constants, normally simple
-   integers, "value" a variable. Added to libpng-1.2.6 JB */
-#define PNG_OUT_OF_RANGE(value, ideal, delta) \
-        ( (value) < (ideal)-(delta) || (value) > (ideal)+(delta) )
-
-/* variables declared in png.c - only it needs to define PNG_NO_EXTERN */
-#if !defined(PNG_NO_EXTERN) || defined(PNG_ALWAYS_EXTERN)
-/* place to hold the signature string for a PNG file. */
-#ifdef PNG_USE_GLOBAL_ARRAYS
-   PNG_EXPORT_VAR (PNG_CONST png_byte FARDATA) png_sig[8];
-#else
-#endif
-#endif /* PNG_NO_EXTERN */
-
-/* Constant strings for known chunk types.  If you need to add a chunk,
- * define the name here, and add an invocation of the macro in png.c and
- * wherever it's needed.
- */
-#define PNG_IHDR png_byte png_IHDR[5] = { 73,  72,  68,  82, '\0'}
-#define PNG_IDAT png_byte png_IDAT[5] = { 73,  68,  65,  84, '\0'}
-#define PNG_IEND png_byte png_IEND[5] = { 73,  69,  78,  68, '\0'}
-#define PNG_PLTE png_byte png_PLTE[5] = { 80,  76,  84,  69, '\0'}
-#define PNG_bKGD png_byte png_bKGD[5] = { 98,  75,  71,  68, '\0'}
-#define PNG_cHRM png_byte png_cHRM[5] = { 99,  72,  82,  77, '\0'}
-#define PNG_gAMA png_byte png_gAMA[5] = {103,  65,  77,  65, '\0'}
-#define PNG_hIST png_byte png_hIST[5] = {104,  73,  83,  84, '\0'}
-#define PNG_iCCP png_byte png_iCCP[5] = {105,  67,  67,  80, '\0'}
-#define PNG_iTXt png_byte png_iTXt[5] = {105,  84,  88, 116, '\0'}
-#define PNG_oFFs png_byte png_oFFs[5] = {111,  70,  70, 115, '\0'}
-#define PNG_pCAL png_byte png_pCAL[5] = {112,  67,  65,  76, '\0'}
-#define PNG_sCAL png_byte png_sCAL[5] = {115,  67,  65,  76, '\0'}
-#define PNG_pHYs png_byte png_pHYs[5] = {112,  72,  89, 115, '\0'}
-#define PNG_sBIT png_byte png_sBIT[5] = {115,  66,  73,  84, '\0'}
-#define PNG_sPLT png_byte png_sPLT[5] = {115,  80,  76,  84, '\0'}
-#define PNG_sRGB png_byte png_sRGB[5] = {115,  82,  71,  66, '\0'}
-#define PNG_tEXt png_byte png_tEXt[5] = {116,  69,  88, 116, '\0'}
-#define PNG_tIME png_byte png_tIME[5] = {116,  73,  77,  69, '\0'}
-#define PNG_tRNS png_byte png_tRNS[5] = {116,  82,  78,  83, '\0'}
-#define PNG_zTXt png_byte png_zTXt[5] = {122,  84,  88, 116, '\0'}
-
-#ifdef PNG_USE_GLOBAL_ARRAYS
-PNG_EXPORT_VAR (png_byte FARDATA) png_IHDR[5];
-PNG_EXPORT_VAR (png_byte FARDATA) png_IDAT[5];
-PNG_EXPORT_VAR (png_byte FARDATA) png_IEND[5];
-PNG_EXPORT_VAR (png_byte FARDATA) png_PLTE[5];
-PNG_EXPORT_VAR (png_byte FARDATA) png_bKGD[5];
-PNG_EXPORT_VAR (png_byte FARDATA) png_cHRM[5];
-PNG_EXPORT_VAR (png_byte FARDATA) png_gAMA[5];
-PNG_EXPORT_VAR (png_byte FARDATA) png_hIST[5];
-PNG_EXPORT_VAR (png_byte FARDATA) png_iCCP[5];
-PNG_EXPORT_VAR (png_byte FARDATA) png_iTXt[5];
-PNG_EXPORT_VAR (png_byte FARDATA) png_oFFs[5];
-PNG_EXPORT_VAR (png_byte FARDATA) png_pCAL[5];
-PNG_EXPORT_VAR (png_byte FARDATA) png_sCAL[5];
-PNG_EXPORT_VAR (png_byte FARDATA) png_pHYs[5];
-PNG_EXPORT_VAR (png_byte FARDATA) png_sBIT[5];
-PNG_EXPORT_VAR (png_byte FARDATA) png_sPLT[5];
-PNG_EXPORT_VAR (png_byte FARDATA) png_sRGB[5];
-PNG_EXPORT_VAR (png_byte FARDATA) png_tEXt[5];
-PNG_EXPORT_VAR (png_byte FARDATA) png_tIME[5];
-PNG_EXPORT_VAR (png_byte FARDATA) png_tRNS[5];
-PNG_EXPORT_VAR (png_byte FARDATA) png_zTXt[5];
-#endif /* PNG_USE_GLOBAL_ARRAYS */
-
-#if defined(PNG_1_0_X) || defined (PNG_1_2_X)
-/* Initialize png_ptr struct for reading, and allocate any other memory.
- * (old interface - DEPRECATED - use png_create_read_struct instead).
- */
-extern PNG_EXPORT(void,png_read_init) PNGARG((png_structp png_ptr));
-#undef png_read_init
-#define png_read_init(png_ptr) png_read_init_3(&png_ptr, \
-    PNG_LIBPNG_VER_STRING,  png_sizeof(png_struct));
-#endif
-
-extern PNG_EXPORT(void,png_read_init_3) PNGARG((png_structpp ptr_ptr,
-    png_const_charp user_png_ver, png_size_t png_struct_size));
-#if defined(PNG_1_0_X) || defined (PNG_1_2_X)
-extern PNG_EXPORT(void,png_read_init_2) PNGARG((png_structp png_ptr,
-    png_const_charp user_png_ver, png_size_t png_struct_size, png_size_t
-    png_info_size));
-#endif
-
-#if defined(PNG_1_0_X) || defined (PNG_1_2_X)
-/* Initialize png_ptr struct for writing, and allocate any other memory.
- * (old interface - DEPRECATED - use png_create_write_struct instead).
- */
-extern PNG_EXPORT(void,png_write_init) PNGARG((png_structp png_ptr));
-#undef png_write_init
-#define png_write_init(png_ptr) png_write_init_3(&png_ptr, \
-    PNG_LIBPNG_VER_STRING, png_sizeof(png_struct));
-#endif
-
-extern PNG_EXPORT(void,png_write_init_3) PNGARG((png_structpp ptr_ptr,
-    png_const_charp user_png_ver, png_size_t png_struct_size));
-extern PNG_EXPORT(void,png_write_init_2) PNGARG((png_structp png_ptr,
-    png_const_charp user_png_ver, png_size_t png_struct_size, png_size_t
-    png_info_size));
-
-/* Allocate memory for an internal libpng struct */
-PNG_EXTERN png_voidp png_create_struct PNGARG((int type));
-
-/* Free memory from internal libpng struct */
-PNG_EXTERN void png_destroy_struct PNGARG((png_voidp struct_ptr));
-
-PNG_EXTERN png_voidp png_create_struct_2 PNGARG((int type, png_malloc_ptr
-  malloc_fn, png_voidp mem_ptr));
-PNG_EXTERN void png_destroy_struct_2 PNGARG((png_voidp struct_ptr,
-   png_free_ptr free_fn, png_voidp mem_ptr));
-
-/* Free any memory that info_ptr points to and reset struct. */
-PNG_EXTERN void png_info_destroy PNGARG((png_structp png_ptr,
-   png_infop info_ptr));
-
-#ifndef PNG_1_0_X
-/* Function to allocate memory for zlib. */
-PNG_EXTERN voidpf png_zalloc PNGARG((voidpf png_ptr, uInt items, uInt size));
-
-/* Function to free memory for zlib */
-PNG_EXTERN void png_zfree PNGARG((voidpf png_ptr, voidpf ptr));
-
-#ifdef PNG_SIZE_T
-/* Function to convert a sizeof an item to png_sizeof item */
-   PNG_EXTERN png_size_t PNGAPI png_convert_size PNGARG((size_t size));
-#endif
-
-/* Next four functions are used internally as callbacks.  PNGAPI is required
- * but not PNG_EXPORT.  PNGAPI added at libpng version 1.2.3. */
-
-PNG_EXTERN void PNGAPI png_default_read_data PNGARG((png_structp png_ptr,
-   png_bytep data, png_size_t length));
-
-#ifdef PNG_PROGRESSIVE_READ_SUPPORTED
-PNG_EXTERN void PNGAPI png_push_fill_buffer PNGARG((png_structp png_ptr,
-   png_bytep buffer, png_size_t length));
-#endif
-
-PNG_EXTERN void PNGAPI png_default_write_data PNGARG((png_structp png_ptr,
-   png_bytep data, png_size_t length));
-
-#if defined(PNG_WRITE_FLUSH_SUPPORTED)
-#if !defined(PNG_NO_STDIO)
-PNG_EXTERN void PNGAPI png_default_flush PNGARG((png_structp png_ptr));
-#endif

 #endif
 #endif

-#else /* PNG_1_0_X */
-#ifdef PNG_PROGRESSIVE_READ_SUPPORTED
-PNG_EXTERN void png_push_fill_buffer PNGARG((png_structp png_ptr,
-   png_bytep buffer, png_size_t length));
-#endif
-#endif /* PNG_1_0_X */
-
-/* Reset the CRC variable */
-PNG_EXTERN void png_reset_crc PNGARG((png_structp png_ptr));
-
-/* Write the "data" buffer to whatever output you are using. */
-PNG_EXTERN void png_write_data PNGARG((png_structp png_ptr, png_bytep data,
-   png_size_t length));
-
-/* Read data from whatever input you are using into the "data" buffer */
-PNG_EXTERN void png_read_data PNGARG((png_structp png_ptr, png_bytep data,
-   png_size_t length));
-
-/* Read bytes into buf, and update png_ptr->crc */
-PNG_EXTERN void png_crc_read PNGARG((png_structp png_ptr, png_bytep buf,
-   png_size_t length));
-
-/* Decompress data in a chunk that uses compression */
-#if defined(PNG_zTXt_SUPPORTED) || defined(PNG_iTXt_SUPPORTED) || \
-    defined(PNG_iCCP_SUPPORTED) || defined(PNG_sPLT_SUPPORTED)
-PNG_EXTERN void png_decompress_chunk PNGARG((png_structp png_ptr,
-   int comp_type, png_size_t chunklength,
-   png_size_t prefix_length, png_size_t *data_length));
-#endif
-
-/* Read "skip" bytes, read the file crc, and (optionally) verify png_ptr->crc */
-PNG_EXTERN int png_crc_finish PNGARG((png_structp png_ptr, png_uint_32 skip));
-
-/* Read the CRC from the file and compare it to the libpng calculated CRC */
-PNG_EXTERN int png_crc_error PNGARG((png_structp png_ptr));

 
 

-/* Calculate the CRC over a section of data.  Note that we are only
- * passing a maximum of 64K on systems that have this as a memory limit,
- * since this is the maximum buffer size we can specify.
+#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.

  */
  */

-PNG_EXTERN void png_calculate_crc PNGARG((png_structp png_ptr, png_bytep ptr,
-   png_size_t length));
-
-#if defined(PNG_WRITE_FLUSH_SUPPORTED)
-PNG_EXTERN void png_flush PNGARG((png_structp png_ptr));
-#endif
-
-/* simple function to write the signature */
-PNG_EXTERN void png_write_sig PNGARG((png_structp png_ptr));
-
-/* write various chunks */
-
-/* Write the IHDR chunk, and update the png_struct with the necessary
- * information.
- */
-PNG_EXTERN void png_write_IHDR PNGARG((png_structp png_ptr, png_uint_32 width,
-   png_uint_32 height,
-   int bit_depth, int color_type, int compression_method, int filter_method,
-   int interlace_method));
-
-PNG_EXTERN void png_write_PLTE PNGARG((png_structp png_ptr, png_colorp palette,
-   png_uint_32 num_pal));
-
-PNG_EXTERN void png_write_IDAT PNGARG((png_structp png_ptr, png_bytep data,
-   png_size_t length));
-
-PNG_EXTERN void png_write_IEND PNGARG((png_structp png_ptr));
-
-#if defined(PNG_WRITE_gAMA_SUPPORTED)
-#ifdef PNG_FLOATING_POINT_SUPPORTED
-PNG_EXTERN void png_write_gAMA PNGARG((png_structp png_ptr, double file_gamma));
-#endif
-#ifdef PNG_FIXED_POINT_SUPPORTED
-PNG_EXTERN void png_write_gAMA_fixed PNGARG((png_structp png_ptr, png_fixed_point
-    file_gamma));
-#endif
-#endif
-
-#if defined(PNG_WRITE_sBIT_SUPPORTED)
-PNG_EXTERN void png_write_sBIT PNGARG((png_structp png_ptr, png_color_8p sbit,
-   int color_type));
-#endif
-
-#if defined(PNG_WRITE_cHRM_SUPPORTED)
-#ifdef PNG_FLOATING_POINT_SUPPORTED
-PNG_EXTERN void png_write_cHRM PNGARG((png_structp png_ptr,
-   double white_x, double white_y,
-   double red_x, double red_y, double green_x, double green_y,
-   double blue_x, double blue_y));
-#endif
-#ifdef PNG_FIXED_POINT_SUPPORTED
-PNG_EXTERN void png_write_cHRM_fixed PNGARG((png_structp png_ptr,
-   png_fixed_point int_white_x, png_fixed_point int_white_y,
-   png_fixed_point int_red_x, png_fixed_point int_red_y, png_fixed_point
-   int_green_x, png_fixed_point int_green_y, png_fixed_point int_blue_x,
-   png_fixed_point int_blue_y));
-#endif
-#endif
-
-#if defined(PNG_WRITE_sRGB_SUPPORTED)
-PNG_EXTERN void png_write_sRGB PNGARG((png_structp png_ptr,
-   int intent));
-#endif
-
-#if defined(PNG_WRITE_iCCP_SUPPORTED)
-PNG_EXTERN void png_write_iCCP PNGARG((png_structp png_ptr,
-   png_charp name, int compression_type,
-   png_charp profile, int proflen));
-   /* Note to maintainer: profile should be png_bytep */
-#endif
-
-#if defined(PNG_WRITE_sPLT_SUPPORTED)
-PNG_EXTERN void png_write_sPLT PNGARG((png_structp png_ptr,
-   png_sPLT_tp palette));
-#endif
-
-#if defined(PNG_WRITE_tRNS_SUPPORTED)
-PNG_EXTERN void png_write_tRNS PNGARG((png_structp png_ptr, png_bytep trans,
-   png_color_16p values, int number, int color_type));
-#endif
-
-#if defined(PNG_WRITE_bKGD_SUPPORTED)
-PNG_EXTERN void png_write_bKGD PNGARG((png_structp png_ptr,
-   png_color_16p values, int color_type));
-#endif
-
-#if defined(PNG_WRITE_hIST_SUPPORTED)
-PNG_EXTERN void png_write_hIST PNGARG((png_structp png_ptr, png_uint_16p hist,
-   int num_hist));
-#endif
-
-#if defined(PNG_WRITE_TEXT_SUPPORTED) || defined(PNG_WRITE_pCAL_SUPPORTED) || \
-    defined(PNG_WRITE_iCCP_SUPPORTED) || defined(PNG_WRITE_sPLT_SUPPORTED)
-PNG_EXTERN png_size_t png_check_keyword PNGARG((png_structp png_ptr,
-   png_charp key, png_charpp new_key));
-#endif
-
-#if defined(PNG_WRITE_tEXt_SUPPORTED)
-PNG_EXTERN void png_write_tEXt PNGARG((png_structp png_ptr, png_charp key,
-   png_charp text, png_size_t text_len));
-#endif
-
-#if defined(PNG_WRITE_zTXt_SUPPORTED)
-PNG_EXTERN void png_write_zTXt PNGARG((png_structp png_ptr, png_charp key,
-   png_charp text, png_size_t text_len, int compression));
-#endif
-
-#if defined(PNG_WRITE_iTXt_SUPPORTED)
-PNG_EXTERN void png_write_iTXt PNGARG((png_structp png_ptr,
-   int compression, png_charp key, png_charp lang, png_charp lang_key,
-   png_charp text));
-#endif
-
-#if defined(PNG_TEXT_SUPPORTED)  /* Added at version 1.0.14 and 1.2.4 */
-PNG_EXTERN int png_set_text_2 PNGARG((png_structp png_ptr,
-   png_infop info_ptr, png_textp text_ptr, int num_text));
-#endif
-
-#if defined(PNG_WRITE_oFFs_SUPPORTED)
-PNG_EXTERN void png_write_oFFs PNGARG((png_structp png_ptr,
-   png_int_32 x_offset, png_int_32 y_offset, int unit_type));
-#endif
-
-#if defined(PNG_WRITE_pCAL_SUPPORTED)
-PNG_EXTERN void png_write_pCAL PNGARG((png_structp png_ptr, png_charp purpose,
-   png_int_32 X0, png_int_32 X1, int type, int nparams,
-   png_charp units, png_charpp params));
-#endif
-
-#if defined(PNG_WRITE_pHYs_SUPPORTED)
-PNG_EXTERN void png_write_pHYs PNGARG((png_structp png_ptr,
-   png_uint_32 x_pixels_per_unit, png_uint_32 y_pixels_per_unit,
-   int unit_type));
-#endif
-
-#if defined(PNG_WRITE_tIME_SUPPORTED)
-PNG_EXTERN void png_write_tIME PNGARG((png_structp png_ptr,
-   png_timep mod_time));
-#endif
-
-#if defined(PNG_WRITE_sCAL_SUPPORTED)
-#if defined(PNG_FLOATING_POINT_SUPPORTED) && !defined(PNG_NO_STDIO)
-PNG_EXTERN void png_write_sCAL PNGARG((png_structp png_ptr,
-   int unit, double width, double height));
-#else
-#ifdef PNG_FIXED_POINT_SUPPORTED
-PNG_EXTERN void png_write_sCAL_s PNGARG((png_structp png_ptr,
-   int unit, png_charp width, png_charp height));
-#endif
-#endif
-#endif
-
-/* Called when finished processing a row of data */
-PNG_EXTERN void png_write_finish_row PNGARG((png_structp png_ptr));
-
-/* Internal use only.   Called before first row of data */
-PNG_EXTERN void png_write_start_row PNGARG((png_structp png_ptr));
+#  define png_get_uint_32(buf) \
+     (((png_uint_32)(*(buf)) << 24) + \
+      ((png_uint_32)(*((buf) + 1)) << 16) + \
+      ((png_uint_32)(*((buf) + 2)) << 8) + \
+      ((png_uint_32)(*((buf) + 3))))
+
+   /* From libpng-1.4.0 until 1.4.4, the png_get_uint_16 macro (but not the
+    * function) incorrectly returned a value of type png_uint_32.
+    */
+#  define png_get_uint_16(buf) \
+     ((png_uint_16) \
+      (((unsigned int)(*(buf)) << 8) + \
+       ((unsigned int)(*((buf) + 1)))))

 
 

-#if defined(PNG_READ_GAMMA_SUPPORTED)
-PNG_EXTERN void png_build_gamma_table PNGARG((png_structp png_ptr));
+#  define png_get_int_32(buf) \
+     ((png_int_32)((*(buf) & 0x80) \
+      ? -((png_int_32)((png_get_uint_32(buf) ^ 0xffffffffL) + 1)) \
+      : (png_int_32)png_get_uint_32(buf)))

 #endif
 
 #endif
 

-/* combine a row of data, dealing with alpha, etc. if requested */
-PNG_EXTERN void png_combine_row PNGARG((png_structp png_ptr, png_bytep row,
-   int mask));
-
-#if defined(PNG_READ_INTERLACING_SUPPORTED)
-/* expand an interlaced row */
-/* OLD pre-1.0.9 interface:
-PNG_EXTERN void png_do_read_interlace PNGARG((png_row_infop row_info,
-   png_bytep row, int pass, png_uint_32 transformations));
+/* Maintainer: Put new public prototypes here ^, in libpng.3, and project
+ * defs

  */
  */

-PNG_EXTERN void png_do_read_interlace PNGARG((png_structp png_ptr));
-#endif
-
-/* GRR TO DO (2.0 or whenever):  simplify other internal calling interfaces */
-
-#if defined(PNG_WRITE_INTERLACING_SUPPORTED)
-/* grab pixels out of a row for an interlaced pass */
-PNG_EXTERN void png_do_write_interlace PNGARG((png_row_infop row_info,
-   png_bytep row, int pass));
-#endif
-
-/* unfilter a row */
-PNG_EXTERN void png_read_filter_row PNGARG((png_structp png_ptr,
-   png_row_infop row_info, png_bytep row, png_bytep prev_row, int filter));
-
-/* Choose the best filter to use and filter the row data */
-PNG_EXTERN void png_write_find_filter PNGARG((png_structp png_ptr,
-   png_row_infop row_info));
-
-/* Write out the filtered row. */
-PNG_EXTERN void png_write_filtered_row PNGARG((png_structp png_ptr,
-   png_bytep filtered_row));
-/* finish a row while reading, dealing with interlacing passes, etc. */
-PNG_EXTERN void png_read_finish_row PNGARG((png_structp png_ptr));
-
-/* initialize the row buffers, etc. */
-PNG_EXTERN void png_read_start_row PNGARG((png_structp png_ptr));
-/* optional call to update the users info structure */
-PNG_EXTERN void png_read_transform_info PNGARG((png_structp png_ptr,
-   png_infop info_ptr));
-
-/* these are the functions that do the transformations */
-#if defined(PNG_READ_FILLER_SUPPORTED)
-PNG_EXTERN void png_do_read_filler PNGARG((png_row_infop row_info,
-   png_bytep row, png_uint_32 filler, png_uint_32 flags));
-#endif
-
-#if defined(PNG_READ_SWAP_ALPHA_SUPPORTED)
-PNG_EXTERN void png_do_read_swap_alpha PNGARG((png_row_infop row_info,
-   png_bytep row));
-#endif
-
-#if defined(PNG_WRITE_SWAP_ALPHA_SUPPORTED)
-PNG_EXTERN void png_do_write_swap_alpha PNGARG((png_row_infop row_info,
-   png_bytep row));
-#endif

 
 

-#if defined(PNG_READ_INVERT_ALPHA_SUPPORTED)
-PNG_EXTERN void png_do_read_invert_alpha PNGARG((png_row_infop row_info,
-   png_bytep row));
-#endif
-
-#if defined(PNG_WRITE_INVERT_ALPHA_SUPPORTED)
-PNG_EXTERN void png_do_write_invert_alpha PNGARG((png_row_infop row_info,
-   png_bytep row));
-#endif
-
-#if defined(PNG_WRITE_FILLER_SUPPORTED) || \
-    defined(PNG_READ_STRIP_ALPHA_SUPPORTED)
-PNG_EXTERN void png_do_strip_filler PNGARG((png_row_infop row_info,
-   png_bytep row, png_uint_32 flags));
-#endif
-
-#if defined(PNG_READ_SWAP_SUPPORTED) || defined(PNG_WRITE_SWAP_SUPPORTED)
-PNG_EXTERN void png_do_swap PNGARG((png_row_infop row_info, png_bytep row));
-#endif
-
-#if defined(PNG_READ_PACKSWAP_SUPPORTED) || defined(PNG_WRITE_PACKSWAP_SUPPORTED)
-PNG_EXTERN void png_do_packswap PNGARG((png_row_infop row_info, png_bytep row));
-#endif
-
-#if defined(PNG_READ_RGB_TO_GRAY_SUPPORTED)
-PNG_EXTERN int png_do_rgb_to_gray PNGARG((png_structp png_ptr, png_row_infop
-   row_info, png_bytep row));
-#endif
-
-#if defined(PNG_READ_GRAY_TO_RGB_SUPPORTED)
-PNG_EXTERN void png_do_gray_to_rgb PNGARG((png_row_infop row_info,
-   png_bytep row));
-#endif
-
-#if defined(PNG_READ_PACK_SUPPORTED)
-PNG_EXTERN void png_do_unpack PNGARG((png_row_infop row_info, png_bytep row));
-#endif
-
-#if defined(PNG_READ_SHIFT_SUPPORTED)
-PNG_EXTERN void png_do_unshift PNGARG((png_row_infop row_info, png_bytep row,
-   png_color_8p sig_bits));
-#endif
-
-#if defined(PNG_READ_INVERT_SUPPORTED) || defined(PNG_WRITE_INVERT_SUPPORTED)
-PNG_EXTERN void png_do_invert PNGARG((png_row_infop row_info, png_bytep row));
-#endif
-
-#if defined(PNG_READ_16_TO_8_SUPPORTED)
-PNG_EXTERN void png_do_chop PNGARG((png_row_infop row_info, png_bytep row));
-#endif
-
-#if defined(PNG_READ_DITHER_SUPPORTED)
-PNG_EXTERN void png_do_dither PNGARG((png_row_infop row_info,
-   png_bytep row, png_bytep palette_lookup, png_bytep dither_lookup));
-
-#  if defined(PNG_CORRECT_PALETTE_SUPPORTED)
-PNG_EXTERN void png_correct_palette PNGARG((png_structp png_ptr,
-   png_colorp palette, int num_palette));
-#  endif
-#endif
-
-#if defined(PNG_READ_BGR_SUPPORTED) || defined(PNG_WRITE_BGR_SUPPORTED)
-PNG_EXTERN void png_do_bgr PNGARG((png_row_infop row_info, png_bytep row));
-#endif
-
-#if defined(PNG_WRITE_PACK_SUPPORTED)
-PNG_EXTERN void png_do_pack PNGARG((png_row_infop row_info,
-   png_bytep row, png_uint_32 bit_depth));
-#endif
-
-#if defined(PNG_WRITE_SHIFT_SUPPORTED)
-PNG_EXTERN void png_do_shift PNGARG((png_row_infop row_info, png_bytep row,
-   png_color_8p bit_depth));
-#endif
-
-#if defined(PNG_READ_BACKGROUND_SUPPORTED)
-#if defined(PNG_READ_GAMMA_SUPPORTED)
-PNG_EXTERN void png_do_background PNGARG((png_row_infop row_info, png_bytep row,
-   png_color_16p trans_values, png_color_16p background,
-   png_color_16p background_1,
-   png_bytep gamma_table, png_bytep gamma_from_1, png_bytep gamma_to_1,
-   png_uint_16pp gamma_16, png_uint_16pp gamma_16_from_1,
-   png_uint_16pp gamma_16_to_1, int gamma_shift));
-#else
-PNG_EXTERN void png_do_background PNGARG((png_row_infop row_info, png_bytep row,
-   png_color_16p trans_values, png_color_16p background));
-#endif
-#endif
-
-#if defined(PNG_READ_GAMMA_SUPPORTED)
-PNG_EXTERN void png_do_gamma PNGARG((png_row_infop row_info, png_bytep row,
-   png_bytep gamma_table, png_uint_16pp gamma_16_table,
-   int gamma_shift));
-#endif
-
-#if defined(PNG_READ_EXPAND_SUPPORTED)
-PNG_EXTERN void png_do_expand_palette PNGARG((png_row_infop row_info,
-   png_bytep row, png_colorp palette, png_bytep trans, int num_trans));
-PNG_EXTERN void png_do_expand PNGARG((png_row_infop row_info,
-   png_bytep row, png_color_16p trans_value));
-#endif
-
-/* The following decodes the appropriate chunks, and does error correction,
- * then calls the appropriate callback for the chunk if it is valid.
+/* The last ordinal number (this is the *last* one already used; the next
+ * one to use is one more than this.)  Maintainer, remember to add an entry to
+ * scripts/symbols.def as well.

  */
  */

-
-/* decode the IHDR chunk */
-PNG_EXTERN void png_handle_IHDR PNGARG((png_structp png_ptr, png_infop info_ptr,
-   png_uint_32 length));
-PNG_EXTERN void png_handle_PLTE PNGARG((png_structp png_ptr, png_infop info_ptr,
-   png_uint_32 length));
-PNG_EXTERN void png_handle_IEND PNGARG((png_structp png_ptr, png_infop info_ptr,
-   png_uint_32 length));
-
-#if defined(PNG_READ_bKGD_SUPPORTED)
-PNG_EXTERN void png_handle_bKGD PNGARG((png_structp png_ptr, png_infop info_ptr,
-   png_uint_32 length));
-#endif
-
-#if defined(PNG_READ_cHRM_SUPPORTED)
-PNG_EXTERN void png_handle_cHRM PNGARG((png_structp png_ptr, png_infop info_ptr,
-   png_uint_32 length));
-#endif
-
-#if defined(PNG_READ_gAMA_SUPPORTED)
-PNG_EXTERN void png_handle_gAMA PNGARG((png_structp png_ptr, png_infop info_ptr,
-   png_uint_32 length));
-#endif
-
-#if defined(PNG_READ_hIST_SUPPORTED)
-PNG_EXTERN void png_handle_hIST PNGARG((png_structp png_ptr, png_infop info_ptr,
-   png_uint_32 length));
+#ifdef PNG_EXPORT_LAST_ORDINAL
+  PNG_EXPORT_LAST_ORDINAL(233);

 #endif
 
 #endif
 

-#if defined(PNG_READ_iCCP_SUPPORTED)
-extern void png_handle_iCCP PNGARG((png_structp png_ptr, png_infop info_ptr,
-   png_uint_32 length));
-#endif /* PNG_READ_iCCP_SUPPORTED */
-
-#if defined(PNG_READ_iTXt_SUPPORTED)
-PNG_EXTERN void png_handle_iTXt PNGARG((png_structp png_ptr, png_infop info_ptr,
-   png_uint_32 length));
-#endif
-
-#if defined(PNG_READ_oFFs_SUPPORTED)
-PNG_EXTERN void png_handle_oFFs PNGARG((png_structp png_ptr, png_infop info_ptr,
-   png_uint_32 length));
-#endif
-
-#if defined(PNG_READ_pCAL_SUPPORTED)
-PNG_EXTERN void png_handle_pCAL PNGARG((png_structp png_ptr, png_infop info_ptr,
-   png_uint_32 length));
-#endif
-
-#if defined(PNG_READ_pHYs_SUPPORTED)
-PNG_EXTERN void png_handle_pHYs PNGARG((png_structp png_ptr, png_infop info_ptr,
-   png_uint_32 length));
-#endif
-
-#if defined(PNG_READ_sBIT_SUPPORTED)
-PNG_EXTERN void png_handle_sBIT PNGARG((png_structp png_ptr, png_infop info_ptr,
-   png_uint_32 length));
-#endif
-
-#if defined(PNG_READ_sCAL_SUPPORTED)
-PNG_EXTERN void png_handle_sCAL PNGARG((png_structp png_ptr, png_infop info_ptr,
-   png_uint_32 length));
-#endif
-
-#if defined(PNG_READ_sPLT_SUPPORTED)
-extern void png_handle_sPLT PNGARG((png_structp png_ptr, png_infop info_ptr,
-   png_uint_32 length));
-#endif /* PNG_READ_sPLT_SUPPORTED */
-
-#if defined(PNG_READ_sRGB_SUPPORTED)
-PNG_EXTERN void png_handle_sRGB PNGARG((png_structp png_ptr, png_infop info_ptr,
-   png_uint_32 length));
-#endif
-
-#if defined(PNG_READ_tEXt_SUPPORTED)
-PNG_EXTERN void png_handle_tEXt PNGARG((png_structp png_ptr, png_infop info_ptr,
-   png_uint_32 length));
-#endif
-
-#if defined(PNG_READ_tIME_SUPPORTED)
-PNG_EXTERN void png_handle_tIME PNGARG((png_structp png_ptr, png_infop info_ptr,
-   png_uint_32 length));
-#endif
-
-#if defined(PNG_READ_tRNS_SUPPORTED)
-PNG_EXTERN void png_handle_tRNS PNGARG((png_structp png_ptr, png_infop info_ptr,
-   png_uint_32 length));
-#endif
-
-#if defined(PNG_READ_zTXt_SUPPORTED)
-PNG_EXTERN void png_handle_zTXt PNGARG((png_structp png_ptr, png_infop info_ptr,
-   png_uint_32 length));
-#endif
-
-PNG_EXTERN void png_handle_unknown PNGARG((png_structp png_ptr,
-   png_infop info_ptr, png_uint_32 length));
-
-PNG_EXTERN void png_check_chunk_name PNGARG((png_structp png_ptr,
-   png_bytep chunk_name));
-
-/* handle the transformations for reading and writing */
-PNG_EXTERN void png_do_read_transformations PNGARG((png_structp png_ptr));
-PNG_EXTERN void png_do_write_transformations PNGARG((png_structp png_ptr));
-
-PNG_EXTERN void png_init_read_transformations PNGARG((png_structp png_ptr));
-
-#ifdef PNG_PROGRESSIVE_READ_SUPPORTED
-PNG_EXTERN void png_push_read_chunk PNGARG((png_structp png_ptr,
-   png_infop info_ptr));
-PNG_EXTERN void png_push_read_sig PNGARG((png_structp png_ptr,
-   png_infop info_ptr));
-PNG_EXTERN void png_push_check_crc PNGARG((png_structp png_ptr));
-PNG_EXTERN void png_push_crc_skip PNGARG((png_structp png_ptr,
-   png_uint_32 length));
-PNG_EXTERN void png_push_crc_finish PNGARG((png_structp png_ptr));
-PNG_EXTERN void png_push_save_buffer PNGARG((png_structp png_ptr));
-PNG_EXTERN void png_push_restore_buffer PNGARG((png_structp png_ptr,
-   png_bytep buffer, png_size_t buffer_length));
-PNG_EXTERN void png_push_read_IDAT PNGARG((png_structp png_ptr));
-PNG_EXTERN void png_process_IDAT_data PNGARG((png_structp png_ptr,
-   png_bytep buffer, png_size_t buffer_length));
-PNG_EXTERN void png_push_process_row PNGARG((png_structp png_ptr));
-PNG_EXTERN void png_push_handle_unknown PNGARG((png_structp png_ptr,
-   png_infop info_ptr, png_uint_32 length));
-PNG_EXTERN void png_push_have_info PNGARG((png_structp png_ptr,
-   png_infop info_ptr));
-PNG_EXTERN void png_push_have_end PNGARG((png_structp png_ptr,
-   png_infop info_ptr));
-PNG_EXTERN void png_push_have_row PNGARG((png_structp png_ptr, png_bytep row));
-PNG_EXTERN void png_push_read_end PNGARG((png_structp png_ptr,
-   png_infop info_ptr));
-PNG_EXTERN void png_process_some_data PNGARG((png_structp png_ptr,
-   png_infop info_ptr));
-PNG_EXTERN void png_read_push_finish_row PNGARG((png_structp png_ptr));
-#if defined(PNG_READ_tEXt_SUPPORTED)
-PNG_EXTERN void png_push_handle_tEXt PNGARG((png_structp png_ptr,
-   png_infop info_ptr, png_uint_32 length));
-PNG_EXTERN void png_push_read_tEXt PNGARG((png_structp png_ptr,
-   png_infop info_ptr));
-#endif
-#if defined(PNG_READ_zTXt_SUPPORTED)
-PNG_EXTERN void png_push_handle_zTXt PNGARG((png_structp png_ptr,
-   png_infop info_ptr, png_uint_32 length));
-PNG_EXTERN void png_push_read_zTXt PNGARG((png_structp png_ptr,
-   png_infop info_ptr));
-#endif
-#if defined(PNG_READ_iTXt_SUPPORTED)
-PNG_EXTERN void png_push_handle_iTXt PNGARG((png_structp png_ptr,
-   png_infop info_ptr, png_uint_32 length));
-PNG_EXTERN void png_push_read_iTXt PNGARG((png_structp png_ptr,
-   png_infop info_ptr));
-#endif
-
-#endif /* PNG_PROGRESSIVE_READ_SUPPORTED */
-
-#ifdef PNG_MNG_FEATURES_SUPPORTED
-PNG_EXTERN void png_do_read_intrapixel PNGARG((png_row_infop row_info,
-   png_bytep row));
-PNG_EXTERN void png_do_write_intrapixel PNGARG((png_row_infop row_info,
-   png_bytep row));
-#endif
-
-#if defined(PNG_ASSEMBLER_CODE_SUPPORTED)
-#if defined(PNG_MMX_CODE_SUPPORTED)
-/* png.c */ /* PRIVATE */
-PNG_EXTERN void png_init_mmx_flags PNGARG((png_structp png_ptr));
-#endif
-#endif
-
-#if defined(PNG_INCH_CONVERSIONS) && defined(PNG_FLOATING_POINT_SUPPORTED)
-PNG_EXTERN png_uint_32 png_get_pixels_per_inch PNGARG((png_structp png_ptr,
-png_infop info_ptr));
-
-PNG_EXTERN png_uint_32 png_get_x_pixels_per_inch PNGARG((png_structp png_ptr,
-png_infop info_ptr));
-
-PNG_EXTERN png_uint_32 png_get_y_pixels_per_inch PNGARG((png_structp png_ptr,
-png_infop info_ptr));
-
-PNG_EXTERN float png_get_x_offset_inches PNGARG((png_structp png_ptr,
-png_infop info_ptr));
-
-PNG_EXTERN float png_get_y_offset_inches PNGARG((png_structp png_ptr,
-png_infop info_ptr));
-
-#if defined(PNG_pHYs_SUPPORTED)
-PNG_EXTERN png_uint_32 png_get_pHYs_dpi PNGARG((png_structp png_ptr,
-png_infop info_ptr, png_uint_32 *res_x, png_uint_32 *res_y, int *unit_type));
-#endif /* PNG_pHYs_SUPPORTED */
-#endif  /* PNG_INCH_CONVERSIONS && PNG_FLOATING_POINT_SUPPORTED */
-
-/* Read the chunk header (length + type name) */
-PNG_EXTERN png_uint_32 png_read_chunk_header PNGARG((png_structp png_ptr));
-
-/* Added at libpng version 1.2.34 */
-#if defined(PNG_cHRM_SUPPORTED)
-PNG_EXTERN int png_check_cHRM_fixed  PNGARG((png_structp png_ptr,
-   png_fixed_point int_white_x, png_fixed_point int_white_y,
-   png_fixed_point int_red_x, png_fixed_point int_red_y, png_fixed_point
-   int_green_x, png_fixed_point int_green_y, png_fixed_point int_blue_x,
-   png_fixed_point int_blue_y));
-#endif
-
-/* Maintainer: Put new private prototypes here ^ and in libpngpf.3 */
-
-#endif /* PNG_INTERNAL */
-

 #ifdef __cplusplus
 }
 #endif
 
 #endif /* PNG_VERSION_INFO_ONLY */
 #ifdef __cplusplus
 }
 #endif
 
 #endif /* PNG_VERSION_INFO_ONLY */

-/* do not put anything past this line */
+/* Do not put anything past this line */

 #endif /* PNG_H */
 #endif /* PNG_H */