nuclear@26: /* png.h - header file for PNG reference library
nuclear@26:  *
nuclear@26:  * libpng version 1.2.33 - October 31, 2008
nuclear@26:  * Copyright (c) 1998-2008 Glenn Randers-Pehrson
nuclear@26:  * (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger)
nuclear@26:  * (Version 0.88 Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.)
nuclear@26:  *
nuclear@26:  * Authors and maintainers:
nuclear@26:  *  libpng versions 0.71, May 1995, through 0.88, January 1996: Guy Schalnat
nuclear@26:  *  libpng versions 0.89c, June 1996, through 0.96, May 1997: Andreas Dilger
nuclear@26:  *  libpng versions 0.97, January 1998, through 1.2.33 - October 31, 2008: Glenn
nuclear@26:  *  See also "Contributing Authors", below.
nuclear@26:  *
nuclear@26:  * Note about libpng version numbers:
nuclear@26:  *
nuclear@26:  *    Due to various miscommunications, unforeseen code incompatibilities
nuclear@26:  *    and occasional factors outside the authors' control, version numbering
nuclear@26:  *    on the library has not always been consistent and straightforward.
nuclear@26:  *    The following table summarizes matters since version 0.89c, which was
nuclear@26:  *    the first widely used release:
nuclear@26:  *
nuclear@26:  *    source                 png.h  png.h  shared-lib
nuclear@26:  *    version                string   int  version
nuclear@26:  *    -------                ------ -----  ----------
nuclear@26:  *    0.89c "1.0 beta 3"     0.89      89  1.0.89
nuclear@26:  *    0.90  "1.0 beta 4"     0.90      90  0.90  [should have been 2.0.90]
nuclear@26:  *    0.95  "1.0 beta 5"     0.95      95  0.95  [should have been 2.0.95]
nuclear@26:  *    0.96  "1.0 beta 6"     0.96      96  0.96  [should have been 2.0.96]
nuclear@26:  *    0.97b "1.00.97 beta 7" 1.00.97   97  1.0.1 [should have been 2.0.97]
nuclear@26:  *    0.97c                  0.97      97  2.0.97
nuclear@26:  *    0.98                   0.98      98  2.0.98
nuclear@26:  *    0.99                   0.99      98  2.0.99
nuclear@26:  *    0.99a-m                0.99      99  2.0.99
nuclear@26:  *    1.00                   1.00     100  2.1.0 [100 should be 10000]
nuclear@26:  *    1.0.0      (from here on, the   100  2.1.0 [100 should be 10000]
nuclear@26:  *    1.0.1       png.h string is   10001  2.1.0
nuclear@26:  *    1.0.1a-e    identical to the  10002  from here on, the shared library
nuclear@26:  *    1.0.2       source version)   10002  is 2.V where V is the source code
nuclear@26:  *    1.0.2a-b                      10003  version, except as noted.
nuclear@26:  *    1.0.3                         10003
nuclear@26:  *    1.0.3a-d                      10004
nuclear@26:  *    1.0.4                         10004
nuclear@26:  *    1.0.4a-f                      10005
nuclear@26:  *    1.0.5 (+ 2 patches)           10005
nuclear@26:  *    1.0.5a-d                      10006
nuclear@26:  *    1.0.5e-r                      10100 (not source compatible)
nuclear@26:  *    1.0.5s-v                      10006 (not binary compatible)
nuclear@26:  *    1.0.6 (+ 3 patches)           10006 (still binary incompatible)
nuclear@26:  *    1.0.6d-f                      10007 (still binary incompatible)
nuclear@26:  *    1.0.6g                        10007
nuclear@26:  *    1.0.6h                        10007  10.6h (testing xy.z so-numbering)
nuclear@26:  *    1.0.6i                        10007  10.6i
nuclear@26:  *    1.0.6j                        10007  2.1.0.6j (incompatible with 1.0.0)
nuclear@26:  *    1.0.7beta11-14        DLLNUM  10007  2.1.0.7beta11-14 (binary compatible)
nuclear@26:  *    1.0.7beta15-18           1    10007  2.1.0.7beta15-18 (binary compatible)
nuclear@26:  *    1.0.7rc1-2               1    10007  2.1.0.7rc1-2 (binary compatible)
nuclear@26:  *    1.0.7                    1    10007  (still compatible)
nuclear@26:  *    1.0.8beta1-4             1    10008  2.1.0.8beta1-4
nuclear@26:  *    1.0.8rc1                 1    10008  2.1.0.8rc1
nuclear@26:  *    1.0.8                    1    10008  2.1.0.8
nuclear@26:  *    1.0.9beta1-6             1    10009  2.1.0.9beta1-6
nuclear@26:  *    1.0.9rc1                 1    10009  2.1.0.9rc1
nuclear@26:  *    1.0.9beta7-10            1    10009  2.1.0.9beta7-10
nuclear@26:  *    1.0.9rc2                 1    10009  2.1.0.9rc2
nuclear@26:  *    1.0.9                    1    10009  2.1.0.9
nuclear@26:  *    1.0.10beta1              1    10010  2.1.0.10beta1
nuclear@26:  *    1.0.10rc1                1    10010  2.1.0.10rc1
nuclear@26:  *    1.0.10                   1    10010  2.1.0.10
nuclear@26:  *    1.0.11beta1-3            1    10011  2.1.0.11beta1-3
nuclear@26:  *    1.0.11rc1                1    10011  2.1.0.11rc1
nuclear@26:  *    1.0.11                   1    10011  2.1.0.11
nuclear@26:  *    1.0.12beta1-2            2    10012  2.1.0.12beta1-2
nuclear@26:  *    1.0.12rc1                2    10012  2.1.0.12rc1
nuclear@26:  *    1.0.12                   2    10012  2.1.0.12
nuclear@26:  *    1.1.0a-f                 -    10100  2.1.1.0a-f (branch abandoned)
nuclear@26:  *    1.2.0beta1-2             2    10200  2.1.2.0beta1-2
nuclear@26:  *    1.2.0beta3-5             3    10200  3.1.2.0beta3-5
nuclear@26:  *    1.2.0rc1                 3    10200  3.1.2.0rc1
nuclear@26:  *    1.2.0                    3    10200  3.1.2.0
nuclear@26:  *    1.2.1beta1-4             3    10201  3.1.2.1beta1-4
nuclear@26:  *    1.2.1rc1-2               3    10201  3.1.2.1rc1-2
nuclear@26:  *    1.2.1                    3    10201  3.1.2.1
nuclear@26:  *    1.2.2beta1-6            12    10202  12.so.0.1.2.2beta1-6
nuclear@26:  *    1.0.13beta1             10    10013  10.so.0.1.0.13beta1
nuclear@26:  *    1.0.13rc1               10    10013  10.so.0.1.0.13rc1
nuclear@26:  *    1.2.2rc1                12    10202  12.so.0.1.2.2rc1
nuclear@26:  *    1.0.13                  10    10013  10.so.0.1.0.13
nuclear@26:  *    1.2.2                   12    10202  12.so.0.1.2.2
nuclear@26:  *    1.2.3rc1-6              12    10203  12.so.0.1.2.3rc1-6
nuclear@26:  *    1.2.3                   12    10203  12.so.0.1.2.3
nuclear@26:  *    1.2.4beta1-3            13    10204  12.so.0.1.2.4beta1-3
nuclear@26:  *    1.0.14rc1               13    10014  10.so.0.1.0.14rc1
nuclear@26:  *    1.2.4rc1                13    10204  12.so.0.1.2.4rc1
nuclear@26:  *    1.0.14                  10    10014  10.so.0.1.0.14
nuclear@26:  *    1.2.4                   13    10204  12.so.0.1.2.4
nuclear@26:  *    1.2.5beta1-2            13    10205  12.so.0.1.2.5beta1-2
nuclear@26:  *    1.0.15rc1-3             10    10015  10.so.0.1.0.15rc1-3
nuclear@26:  *    1.2.5rc1-3              13    10205  12.so.0.1.2.5rc1-3
nuclear@26:  *    1.0.15                  10    10015  10.so.0.1.0.15
nuclear@26:  *    1.2.5                   13    10205  12.so.0.1.2.5
nuclear@26:  *    1.2.6beta1-4            13    10206  12.so.0.1.2.6beta1-4
nuclear@26:  *    1.0.16                  10    10016  10.so.0.1.0.16
nuclear@26:  *    1.2.6                   13    10206  12.so.0.1.2.6
nuclear@26:  *    1.2.7beta1-2            13    10207  12.so.0.1.2.7beta1-2
nuclear@26:  *    1.0.17rc1               10    10017  10.so.0.1.0.17rc1
nuclear@26:  *    1.2.7rc1                13    10207  12.so.0.1.2.7rc1
nuclear@26:  *    1.0.17                  10    10017  10.so.0.1.0.17
nuclear@26:  *    1.2.7                   13    10207  12.so.0.1.2.7
nuclear@26:  *    1.2.8beta1-5            13    10208  12.so.0.1.2.8beta1-5
nuclear@26:  *    1.0.18rc1-5             10    10018  10.so.0.1.0.18rc1-5
nuclear@26:  *    1.2.8rc1-5              13    10208  12.so.0.1.2.8rc1-5
nuclear@26:  *    1.0.18                  10    10018  10.so.0.1.0.18
nuclear@26:  *    1.2.8                   13    10208  12.so.0.1.2.8
nuclear@26:  *    1.2.9beta1-3            13    10209  12.so.0.1.2.9beta1-3
nuclear@26:  *    1.2.9beta4-11           13    10209  12.so.0.9[.0]
nuclear@26:  *    1.2.9rc1                13    10209  12.so.0.9[.0]
nuclear@26:  *    1.2.9                   13    10209  12.so.0.9[.0]
nuclear@26:  *    1.2.10beta1-8           13    10210  12.so.0.10[.0]
nuclear@26:  *    1.2.10rc1-3             13    10210  12.so.0.10[.0]
nuclear@26:  *    1.2.10                  13    10210  12.so.0.10[.0]
nuclear@26:  *    1.2.11beta1-4           13    10211  12.so.0.11[.0]
nuclear@26:  *    1.0.19rc1-5             10    10019  10.so.0.19[.0]
nuclear@26:  *    1.2.11rc1-5             13    10211  12.so.0.11[.0]
nuclear@26:  *    1.0.19                  10    10019  10.so.0.19[.0]
nuclear@26:  *    1.2.11                  13    10211  12.so.0.11[.0]
nuclear@26:  *    1.0.20                  10    10020  10.so.0.20[.0]
nuclear@26:  *    1.2.12                  13    10212  12.so.0.12[.0]
nuclear@26:  *    1.2.13beta1             13    10213  12.so.0.13[.0]
nuclear@26:  *    1.0.21                  10    10021  10.so.0.21[.0]
nuclear@26:  *    1.2.13                  13    10213  12.so.0.13[.0]
nuclear@26:  *    1.2.14beta1-2           13    10214  12.so.0.14[.0]
nuclear@26:  *    1.0.22rc1               10    10022  10.so.0.22[.0]
nuclear@26:  *    1.2.14rc1               13    10214  12.so.0.14[.0]
nuclear@26:  *    1.0.22                  10    10022  10.so.0.22[.0]
nuclear@26:  *    1.2.14                  13    10214  12.so.0.14[.0]
nuclear@26:  *    1.2.15beta1-6           13    10215  12.so.0.15[.0]
nuclear@26:  *    1.0.23rc1-5             10    10023  10.so.0.23[.0]
nuclear@26:  *    1.2.15rc1-5             13    10215  12.so.0.15[.0]
nuclear@26:  *    1.0.23                  10    10023  10.so.0.23[.0]
nuclear@26:  *    1.2.15                  13    10215  12.so.0.15[.0]
nuclear@26:  *    1.2.16beta1-2           13    10216  12.so.0.16[.0]
nuclear@26:  *    1.2.16rc1               13    10216  12.so.0.16[.0]
nuclear@26:  *    1.0.24                  10    10024  10.so.0.24[.0]
nuclear@26:  *    1.2.16                  13    10216  12.so.0.16[.0]
nuclear@26:  *    1.2.17beta1-2           13    10217  12.so.0.17[.0]
nuclear@26:  *    1.0.25rc1               10    10025  10.so.0.25[.0]
nuclear@26:  *    1.2.17rc1-3             13    10217  12.so.0.17[.0]
nuclear@26:  *    1.0.25                  10    10025  10.so.0.25[.0]
nuclear@26:  *    1.2.17                  13    10217  12.so.0.17[.0]
nuclear@26:  *    1.0.26                  10    10026  10.so.0.26[.0]
nuclear@26:  *    1.2.18                  13    10218  12.so.0.18[.0]
nuclear@26:  *    1.2.19beta1-31          13    10219  12.so.0.19[.0]
nuclear@26:  *    1.0.27rc1-6             10    10027  10.so.0.27[.0]
nuclear@26:  *    1.2.19rc1-6             13    10219  12.so.0.19[.0]
nuclear@26:  *    1.0.27                  10    10027  10.so.0.27[.0]
nuclear@26:  *    1.2.19                  13    10219  12.so.0.19[.0]
nuclear@26:  *    1.2.20beta01-04         13    10220  12.so.0.20[.0]
nuclear@26:  *    1.0.28rc1-6             10    10028  10.so.0.28[.0]
nuclear@26:  *    1.2.20rc1-6             13    10220  12.so.0.20[.0]
nuclear@26:  *    1.0.28                  10    10028  10.so.0.28[.0]
nuclear@26:  *    1.2.20                  13    10220  12.so.0.20[.0]
nuclear@26:  *    1.2.21beta1-2           13    10221  12.so.0.21[.0]
nuclear@26:  *    1.2.21rc1-3             13    10221  12.so.0.21[.0]
nuclear@26:  *    1.0.29                  10    10029  10.so.0.29[.0]
nuclear@26:  *    1.2.21                  13    10221  12.so.0.21[.0]
nuclear@26:  *    1.2.22beta1-4           13    10222  12.so.0.22[.0]
nuclear@26:  *    1.0.30rc1               10    10030  10.so.0.30[.0]
nuclear@26:  *    1.2.22rc1               13    10222  12.so.0.22[.0]
nuclear@26:  *    1.0.30                  10    10030  10.so.0.30[.0]
nuclear@26:  *    1.2.22                  13    10222  12.so.0.22[.0]
nuclear@26:  *    1.2.23beta01-05         13    10223  12.so.0.23[.0]
nuclear@26:  *    1.2.23rc01              13    10223  12.so.0.23[.0]
nuclear@26:  *    1.2.23                  13    10223  12.so.0.23[.0]
nuclear@26:  *    1.2.24beta01-02         13    10224  12.so.0.24[.0]
nuclear@26:  *    1.2.24rc01              13    10224  12.so.0.24[.0]
nuclear@26:  *    1.2.24                  13    10224  12.so.0.24[.0]
nuclear@26:  *    1.2.25beta01-06         13    10225  12.so.0.25[.0]
nuclear@26:  *    1.2.25rc01-02           13    10225  12.so.0.25[.0]
nuclear@26:  *    1.0.31                  10    10031  10.so.0.31[.0]
nuclear@26:  *    1.2.25                  13    10225  12.so.0.25[.0]
nuclear@26:  *    1.2.26beta01-06         13    10226  12.so.0.26[.0]
nuclear@26:  *    1.2.26rc01              13    10226  12.so.0.26[.0]
nuclear@26:  *    1.2.26                  13    10226  12.so.0.26[.0]
nuclear@26:  *    1.0.32                  10    10032  10.so.0.32[.0]
nuclear@26:  *    1.2.27beta01-06         13    10227  12.so.0.27[.0]
nuclear@26:  *    1.2.27rc01              13    10227  12.so.0.27[.0]
nuclear@26:  *    1.0.33                  10    10033  10.so.0.33[.0]
nuclear@26:  *    1.2.27                  13    10227  12.so.0.27[.0]
nuclear@26:  *    1.0.34                  10    10034  10.so.0.34[.0]
nuclear@26:  *    1.2.28                  13    10228  12.so.0.28[.0]
nuclear@26:  *    1.2.29beta01-03         13    10229  12.so.0.29[.0]
nuclear@26:  *    1.2.29rc01              13    10229  12.so.0.29[.0]
nuclear@26:  *    1.0.35                  10    10035  10.so.0.35[.0]
nuclear@26:  *    1.2.29                  13    10229  12.so.0.29[.0]
nuclear@26:  *    1.0.37                  10    10037  10.so.0.37[.0]
nuclear@26:  *    1.2.30beta01-04         13    10230  12.so.0.30[.0]
nuclear@26:  *    1.0.38rc01-08           10    10038  10.so.0.38[.0]
nuclear@26:  *    1.2.30rc01-08           13    10230  12.so.0.30[.0]
nuclear@26:  *    1.0.38                  10    10038  10.so.0.38[.0]
nuclear@26:  *    1.2.30                  13    10230  12.so.0.30[.0]
nuclear@26:  *    1.0.39rc01-03           10    10039  10.so.0.39[.0]
nuclear@26:  *    1.2.31rc01-03           13    10231  12.so.0.31[.0]
nuclear@26:  *    1.0.39                  10    10039  10.so.0.39[.0]
nuclear@26:  *    1.2.31                  13    10231  12.so.0.31[.0]
nuclear@26:  *    1.2.32beta01-02         13    10232  12.so.0.32[.0]
nuclear@26:  *    1.0.40rc01              10    10040  10.so.0.40[.0]
nuclear@26:  *    1.2.32rc01              13    10232  12.so.0.32[.0]
nuclear@26:  *    1.0.40                  10    10040  10.so.0.40[.0]
nuclear@26:  *    1.2.32                  13    10232  12.so.0.32[.0]
nuclear@26:  *    1.2.33beta01-02         13    10233  12.so.0.33[.0]
nuclear@26:  *    1.2.33rc01-02           13    10233  12.so.0.33[.0]
nuclear@26:  *    1.0.41rc01              10    10041  10.so.0.41[.0]
nuclear@26:  *    1.2.33                  13    10233  12.so.0.33[.0]
nuclear@26:  *    1.0.41                  10    10041  10.so.0.41[.0]
nuclear@26:  *
nuclear@26:  *    Henceforth the source version will match the shared-library major
nuclear@26:  *    and minor numbers; the shared-library major version number will be
nuclear@26:  *    used for changes in backward compatibility, as it is intended.  The
nuclear@26:  *    PNG_LIBPNG_VER macro, which is not used within libpng but is available
nuclear@26:  *    for applications, is an unsigned integer of the form xyyzz corresponding
nuclear@26:  *    to the source version x.y.z (leading zeros in y and z).  Beta versions
nuclear@26:  *    were given the previous public release number plus a letter, until
nuclear@26:  *    version 1.0.6j; from then on they were given the upcoming public
nuclear@26:  *    release number plus "betaNN" or "rcNN".
nuclear@26:  *
nuclear@26:  *    Binary incompatibility exists only when applications make direct access
nuclear@26:  *    to the info_ptr or png_ptr members through png.h, and the compiled
nuclear@26:  *    application is loaded with a different version of the library.
nuclear@26:  *
nuclear@26:  *    DLLNUM will change each time there are forward or backward changes
nuclear@26:  *    in binary compatibility (e.g., when a new feature is added).
nuclear@26:  *
nuclear@26:  * See libpng.txt or libpng.3 for more information.  The PNG specification
nuclear@26:  * is available as a W3C Recommendation and as an ISO Specification,
nuclear@26:  * <http://www.w3.org/TR/2003/REC-PNG-20031110/
nuclear@26:  */
nuclear@26: 
nuclear@26: /*
nuclear@26:  * COPYRIGHT NOTICE, DISCLAIMER, and LICENSE:
nuclear@26:  *
nuclear@26:  * If you modify libpng you may insert additional notices immediately following
nuclear@26:  * this sentence.
nuclear@26:  *
nuclear@26:  * libpng versions 1.2.6, August 15, 2004, through 1.2.33, October 31, 2008, are
nuclear@26:  * Copyright (c) 2004, 2006-2008 Glenn Randers-Pehrson, and are
nuclear@26:  * distributed according to the same disclaimer and license as libpng-1.2.5
nuclear@26:  * with the following individual added to the list of Contributing Authors:
nuclear@26:  *
nuclear@26:  *    Cosmin Truta
nuclear@26:  *
nuclear@26:  * libpng versions 1.0.7, July 1, 2000, through 1.2.5, October 3, 2002, are
nuclear@26:  * Copyright (c) 2000-2002 Glenn Randers-Pehrson, and are
nuclear@26:  * distributed according to the same disclaimer and license as libpng-1.0.6
nuclear@26:  * with the following individuals added to the list of Contributing Authors:
nuclear@26:  *
nuclear@26:  *    Simon-Pierre Cadieux
nuclear@26:  *    Eric S. Raymond
nuclear@26:  *    Gilles Vollant
nuclear@26:  *
nuclear@26:  * and with the following additions to the disclaimer:
nuclear@26:  *
nuclear@26:  *    There is no warranty against interference with your enjoyment of the
nuclear@26:  *    library or against infringement.  There is no warranty that our
nuclear@26:  *    efforts or the library will fulfill any of your particular purposes
nuclear@26:  *    or needs.  This library is provided with all faults, and the entire
nuclear@26:  *    risk of satisfactory quality, performance, accuracy, and effort is with
nuclear@26:  *    the user.
nuclear@26:  *
nuclear@26:  * libpng versions 0.97, January 1998, through 1.0.6, March 20, 2000, are
nuclear@26:  * Copyright (c) 1998, 1999, 2000 Glenn Randers-Pehrson, and are
nuclear@26:  * distributed according to the same disclaimer and license as libpng-0.96,
nuclear@26:  * with the following individuals added to the list of Contributing Authors:
nuclear@26:  *
nuclear@26:  *    Tom Lane
nuclear@26:  *    Glenn Randers-Pehrson
nuclear@26:  *    Willem van Schaik
nuclear@26:  *
nuclear@26:  * libpng versions 0.89, June 1996, through 0.96, May 1997, are
nuclear@26:  * Copyright (c) 1996, 1997 Andreas Dilger
nuclear@26:  * Distributed according to the same disclaimer and license as libpng-0.88,
nuclear@26:  * with the following individuals added to the list of Contributing Authors:
nuclear@26:  *
nuclear@26:  *    John Bowler
nuclear@26:  *    Kevin Bracey
nuclear@26:  *    Sam Bushell
nuclear@26:  *    Magnus Holmgren
nuclear@26:  *    Greg Roelofs
nuclear@26:  *    Tom Tanner
nuclear@26:  *
nuclear@26:  * libpng versions 0.5, May 1995, through 0.88, January 1996, are
nuclear@26:  * Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.
nuclear@26:  *
nuclear@26:  * For the purposes of this copyright and license, "Contributing Authors"
nuclear@26:  * is defined as the following set of individuals:
nuclear@26:  *
nuclear@26:  *    Andreas Dilger
nuclear@26:  *    Dave Martindale
nuclear@26:  *    Guy Eric Schalnat
nuclear@26:  *    Paul Schmidt
nuclear@26:  *    Tim Wegner
nuclear@26:  *
nuclear@26:  * The PNG Reference Library is supplied "AS IS".  The Contributing Authors
nuclear@26:  * and Group 42, Inc. disclaim all warranties, expressed or implied,
nuclear@26:  * including, without limitation, the warranties of merchantability and of
nuclear@26:  * fitness for any purpose.  The Contributing Authors and Group 42, Inc.
nuclear@26:  * assume no liability for direct, indirect, incidental, special, exemplary,
nuclear@26:  * or consequential damages, which may result from the use of the PNG
nuclear@26:  * Reference Library, even if advised of the possibility of such damage.
nuclear@26:  *
nuclear@26:  * Permission is hereby granted to use, copy, modify, and distribute this
nuclear@26:  * source code, or portions hereof, for any purpose, without fee, subject
nuclear@26:  * to the following restrictions:
nuclear@26:  *
nuclear@26:  * 1. The origin of this source code must not be misrepresented.
nuclear@26:  *
nuclear@26:  * 2. Altered versions must be plainly marked as such and
nuclear@26:  * must not be misrepresented as being the original source.
nuclear@26:  *
nuclear@26:  * 3. This Copyright notice may not be removed or altered from
nuclear@26:  *    any source or altered source distribution.
nuclear@26:  *
nuclear@26:  * The Contributing Authors and Group 42, Inc. specifically permit, without
nuclear@26:  * fee, and encourage the use of this source code as a component to
nuclear@26:  * supporting the PNG file format in commercial products.  If you use this
nuclear@26:  * source code in a product, acknowledgment is not required but would be
nuclear@26:  * appreciated.
nuclear@26:  */
nuclear@26: 
nuclear@26: /*
nuclear@26:  * A "png_get_copyright" function is available, for convenient use in "about"
nuclear@26:  * boxes and the like:
nuclear@26:  *
nuclear@26:  * printf("%s",png_get_copyright(NULL));
nuclear@26:  *
nuclear@26:  * Also, the PNG logo (in PNG format, of course) is supplied in the
nuclear@26:  * files "pngbar.png" and "pngbar.jpg (88x31) and "pngnow.png" (98x31).
nuclear@26:  */
nuclear@26: 
nuclear@26: /*
nuclear@26:  * Libpng is OSI Certified Open Source Software.  OSI Certified is a
nuclear@26:  * certification mark of the Open Source Initiative.
nuclear@26:  */
nuclear@26: 
nuclear@26: /*
nuclear@26:  * The contributing authors would like to thank all those who helped
nuclear@26:  * with testing, bug fixes, and patience.  This wouldn't have been
nuclear@26:  * possible without all of you.
nuclear@26:  *
nuclear@26:  * Thanks to Frank J. T. Wojcik for helping with the documentation.
nuclear@26:  */
nuclear@26: 
nuclear@26: /*
nuclear@26:  * Y2K compliance in libpng:
nuclear@26:  * =========================
nuclear@26:  *
nuclear@26:  *    October 31, 2008
nuclear@26:  *
nuclear@26:  *    Since the PNG Development group is an ad-hoc body, we can't make
nuclear@26:  *    an official declaration.
nuclear@26:  *
nuclear@26:  *    This is your unofficial assurance that libpng from version 0.71 and
nuclear@26:  *    upward through 1.2.33 are Y2K compliant.  It is my belief that earlier
nuclear@26:  *    versions were also Y2K compliant.
nuclear@26:  *
nuclear@26:  *    Libpng only has three year fields.  One is a 2-byte unsigned integer
nuclear@26:  *    that will hold years up to 65535.  The other two hold the date in text
nuclear@26:  *    format, and will hold years up to 9999.
nuclear@26:  *
nuclear@26:  *    The integer is
nuclear@26:  *        "png_uint_16 year" in png_time_struct.
nuclear@26:  *
nuclear@26:  *    The strings are
nuclear@26:  *        "png_charp time_buffer" in png_struct and
nuclear@26:  *        "near_time_buffer", which is a local character string in png.c.
nuclear@26:  *
nuclear@26:  *    There are seven time-related functions:
nuclear@26:  *        png.c: png_convert_to_rfc_1123() in png.c
nuclear@26:  *          (formerly png_convert_to_rfc_1152() in error)
nuclear@26:  *        png_convert_from_struct_tm() in pngwrite.c, called in pngwrite.c
nuclear@26:  *        png_convert_from_time_t() in pngwrite.c
nuclear@26:  *        png_get_tIME() in pngget.c
nuclear@26:  *        png_handle_tIME() in pngrutil.c, called in pngread.c
nuclear@26:  *        png_set_tIME() in pngset.c
nuclear@26:  *        png_write_tIME() in pngwutil.c, called in pngwrite.c
nuclear@26:  *
nuclear@26:  *    All handle dates properly in a Y2K environment.  The
nuclear@26:  *    png_convert_from_time_t() function calls gmtime() to convert from system
nuclear@26:  *    clock time, which returns (year - 1900), which we properly convert to
nuclear@26:  *    the full 4-digit year.  There is a possibility that applications using
nuclear@26:  *    libpng are not passing 4-digit years into the png_convert_to_rfc_1123()
nuclear@26:  *    function, or that they are incorrectly passing only a 2-digit year
nuclear@26:  *    instead of "year - 1900" into the png_convert_from_struct_tm() function,
nuclear@26:  *    but this is not under our control.  The libpng documentation has always
nuclear@26:  *    stated that it works with 4-digit years, and the APIs have been
nuclear@26:  *    documented as such.
nuclear@26:  *
nuclear@26:  *    The tIME chunk itself is also Y2K compliant.  It uses a 2-byte unsigned
nuclear@26:  *    integer to hold the year, and can hold years as large as 65535.
nuclear@26:  *
nuclear@26:  *    zlib, upon which libpng depends, is also Y2K compliant.  It contains
nuclear@26:  *    no date-related code.
nuclear@26:  *
nuclear@26:  *       Glenn Randers-Pehrson
nuclear@26:  *       libpng maintainer
nuclear@26:  *       PNG Development Group
nuclear@26:  */
nuclear@26: 
nuclear@26: #ifndef PNG_H
nuclear@26: #define PNG_H
nuclear@26: 
nuclear@26: /* This is not the place to learn how to use libpng.  The file libpng.txt
nuclear@26:  * describes how to use libpng, and the file example.c summarizes it
nuclear@26:  * with some code on which to build.  This file is useful for looking
nuclear@26:  * at the actual function definitions and structure components.
nuclear@26:  */
nuclear@26: 
nuclear@26: /* Version information for png.h - this should match the version in png.c */
nuclear@26: #define PNG_LIBPNG_VER_STRING "1.2.33"
nuclear@26: #define PNG_HEADER_VERSION_STRING \
nuclear@26:    " libpng version 1.2.33 - October 31, 2008\n"
nuclear@26: 
nuclear@26: #define PNG_LIBPNG_VER_SONUM   0
nuclear@26: #define PNG_LIBPNG_VER_DLLNUM  13
nuclear@26: 
nuclear@26: /* These should match the first 3 components of PNG_LIBPNG_VER_STRING: */
nuclear@26: #define PNG_LIBPNG_VER_MAJOR   1
nuclear@26: #define PNG_LIBPNG_VER_MINOR   2
nuclear@26: #define PNG_LIBPNG_VER_RELEASE 33
nuclear@26: /* This should match the numeric part of the final component of
nuclear@26:  * PNG_LIBPNG_VER_STRING, omitting any leading zero: */
nuclear@26: 
nuclear@26: #define PNG_LIBPNG_VER_BUILD  0
nuclear@26: 
nuclear@26: /* Release Status */
nuclear@26: #define PNG_LIBPNG_BUILD_ALPHA    1
nuclear@26: #define PNG_LIBPNG_BUILD_BETA     2
nuclear@26: #define PNG_LIBPNG_BUILD_RC       3
nuclear@26: #define PNG_LIBPNG_BUILD_STABLE   4
nuclear@26: #define PNG_LIBPNG_BUILD_RELEASE_STATUS_MASK 7
nuclear@26:   
nuclear@26: /* Release-Specific Flags */
nuclear@26: #define PNG_LIBPNG_BUILD_PATCH    8 /* Can be OR'ed with
nuclear@26:                                        PNG_LIBPNG_BUILD_STABLE only */
nuclear@26: #define PNG_LIBPNG_BUILD_PRIVATE 16 /* Cannot be OR'ed with
nuclear@26:                                        PNG_LIBPNG_BUILD_SPECIAL */
nuclear@26: #define PNG_LIBPNG_BUILD_SPECIAL 32 /* Cannot be OR'ed with
nuclear@26:                                        PNG_LIBPNG_BUILD_PRIVATE */
nuclear@26: 
nuclear@26: #define PNG_LIBPNG_BUILD_BASE_TYPE PNG_LIBPNG_BUILD_STABLE
nuclear@26: 
nuclear@26: /* Careful here.  At one time, Guy wanted to use 082, but that would be octal.
nuclear@26:  * We must not include leading zeros.
nuclear@26:  * Versions 0.7 through 1.0.0 were in the range 0 to 100 here (only
nuclear@26:  * version 1.0.0 was mis-numbered 100 instead of 10000).  From
nuclear@26:  * version 1.0.1 it's    xxyyzz, where x=major, y=minor, z=release */
nuclear@26: #define PNG_LIBPNG_VER 10233 /* 1.2.33 */
nuclear@26: 
nuclear@26: #ifndef PNG_VERSION_INFO_ONLY
nuclear@26: /* include the compression library's header */
nuclear@26: #include "zlib.h"
nuclear@26: #endif
nuclear@26: 
nuclear@26: /* include all user configurable info, including optional assembler routines */
nuclear@26: #include "pngconf.h"
nuclear@26: 
nuclear@26: /*
nuclear@26:  * Added at libpng-1.2.8 */
nuclear@26: /* Ref MSDN: Private as priority over Special
nuclear@26:  * VS_FF_PRIVATEBUILD File *was not* built using standard release
nuclear@26:  * procedures. If this value is given, the StringFileInfo block must
nuclear@26:  * contain a PrivateBuild string. 
nuclear@26:  *
nuclear@26:  * VS_FF_SPECIALBUILD File *was* built by the original company using
nuclear@26:  * standard release procedures but is a variation of the standard
nuclear@26:  * file of the same version number. If this value is given, the
nuclear@26:  * StringFileInfo block must contain a SpecialBuild string. 
nuclear@26:  */
nuclear@26: 
nuclear@26: #if defined(PNG_USER_PRIVATEBUILD)
nuclear@26: #  define PNG_LIBPNG_BUILD_TYPE \
nuclear@26:           (PNG_LIBPNG_BUILD_BASE_TYPE | PNG_LIBPNG_BUILD_PRIVATE)
nuclear@26: #else
nuclear@26: #  if defined(PNG_LIBPNG_SPECIALBUILD)
nuclear@26: #    define PNG_LIBPNG_BUILD_TYPE \
nuclear@26:             (PNG_LIBPNG_BUILD_BASE_TYPE | PNG_LIBPNG_BUILD_SPECIAL)
nuclear@26: #  else
nuclear@26: #    define PNG_LIBPNG_BUILD_TYPE (PNG_LIBPNG_BUILD_BASE_TYPE)
nuclear@26: #  endif
nuclear@26: #endif
nuclear@26: 
nuclear@26: #ifndef PNG_VERSION_INFO_ONLY
nuclear@26: 
nuclear@26: /* Inhibit C++ name-mangling for libpng functions but not for system calls. */
nuclear@26: #ifdef __cplusplus
nuclear@26: extern "C" {
nuclear@26: #endif /* __cplusplus */
nuclear@26: 
nuclear@26: /* This file is arranged in several sections.  The first section contains
nuclear@26:  * structure and type definitions.  The second section contains the external
nuclear@26:  * library functions, while the third has the internal library functions,
nuclear@26:  * which applications aren't expected to use directly.
nuclear@26:  */
nuclear@26: 
nuclear@26: #ifndef PNG_NO_TYPECAST_NULL
nuclear@26: #define int_p_NULL                (int *)NULL
nuclear@26: #define png_bytep_NULL            (png_bytep)NULL
nuclear@26: #define png_bytepp_NULL           (png_bytepp)NULL
nuclear@26: #define png_doublep_NULL          (png_doublep)NULL
nuclear@26: #define png_error_ptr_NULL        (png_error_ptr)NULL
nuclear@26: #define png_flush_ptr_NULL        (png_flush_ptr)NULL
nuclear@26: #define png_free_ptr_NULL         (png_free_ptr)NULL
nuclear@26: #define png_infopp_NULL           (png_infopp)NULL
nuclear@26: #define png_malloc_ptr_NULL       (png_malloc_ptr)NULL
nuclear@26: #define png_read_status_ptr_NULL  (png_read_status_ptr)NULL
nuclear@26: #define png_rw_ptr_NULL           (png_rw_ptr)NULL
nuclear@26: #define png_structp_NULL          (png_structp)NULL
nuclear@26: #define png_uint_16p_NULL         (png_uint_16p)NULL
nuclear@26: #define png_voidp_NULL            (png_voidp)NULL
nuclear@26: #define png_write_status_ptr_NULL (png_write_status_ptr)NULL
nuclear@26: #else
nuclear@26: #define int_p_NULL                NULL
nuclear@26: #define png_bytep_NULL            NULL
nuclear@26: #define png_bytepp_NULL           NULL
nuclear@26: #define png_doublep_NULL          NULL
nuclear@26: #define png_error_ptr_NULL        NULL
nuclear@26: #define png_flush_ptr_NULL        NULL
nuclear@26: #define png_free_ptr_NULL         NULL
nuclear@26: #define png_infopp_NULL           NULL
nuclear@26: #define png_malloc_ptr_NULL       NULL
nuclear@26: #define png_read_status_ptr_NULL  NULL
nuclear@26: #define png_rw_ptr_NULL           NULL
nuclear@26: #define png_structp_NULL          NULL
nuclear@26: #define png_uint_16p_NULL         NULL
nuclear@26: #define png_voidp_NULL            NULL
nuclear@26: #define png_write_status_ptr_NULL NULL
nuclear@26: #endif
nuclear@26: 
nuclear@26: /* variables declared in png.c - only it needs to define PNG_NO_EXTERN */
nuclear@26: #if !defined(PNG_NO_EXTERN) || defined(PNG_ALWAYS_EXTERN)
nuclear@26: /* Version information for C files, stored in png.c.  This had better match
nuclear@26:  * the version above.
nuclear@26:  */
nuclear@26: #ifdef PNG_USE_GLOBAL_ARRAYS
nuclear@26: PNG_EXPORT_VAR (PNG_CONST char) png_libpng_ver[18];
nuclear@26:   /* need room for 99.99.99beta99z */
nuclear@26: #else
nuclear@26: #define png_libpng_ver png_get_header_ver(NULL)
nuclear@26: #endif
nuclear@26: 
nuclear@26: #ifdef PNG_USE_GLOBAL_ARRAYS
nuclear@26: /* This was removed in version 1.0.5c */
nuclear@26: /* Structures to facilitate easy interlacing.  See png.c for more details */
nuclear@26: PNG_EXPORT_VAR (PNG_CONST int FARDATA) png_pass_start[7];
nuclear@26: PNG_EXPORT_VAR (PNG_CONST int FARDATA) png_pass_inc[7];
nuclear@26: PNG_EXPORT_VAR (PNG_CONST int FARDATA) png_pass_ystart[7];
nuclear@26: PNG_EXPORT_VAR (PNG_CONST int FARDATA) png_pass_yinc[7];
nuclear@26: PNG_EXPORT_VAR (PNG_CONST int FARDATA) png_pass_mask[7];
nuclear@26: PNG_EXPORT_VAR (PNG_CONST int FARDATA) png_pass_dsp_mask[7];
nuclear@26: /* This isn't currently used.  If you need it, see png.c for more details.
nuclear@26: PNG_EXPORT_VAR (PNG_CONST int FARDATA) png_pass_height[7];
nuclear@26: */
nuclear@26: #endif
nuclear@26: 
nuclear@26: #endif /* PNG_NO_EXTERN */
nuclear@26: 
nuclear@26: /* Three color definitions.  The order of the red, green, and blue, (and the
nuclear@26:  * exact size) is not important, although the size of the fields need to
nuclear@26:  * be png_byte or png_uint_16 (as defined below).
nuclear@26:  */
nuclear@26: typedef struct png_color_struct
nuclear@26: {
nuclear@26:    png_byte red;
nuclear@26:    png_byte green;
nuclear@26:    png_byte blue;
nuclear@26: } png_color;
nuclear@26: typedef png_color FAR * png_colorp;
nuclear@26: typedef png_color FAR * FAR * png_colorpp;
nuclear@26: 
nuclear@26: typedef struct png_color_16_struct
nuclear@26: {
nuclear@26:    png_byte index;    /* used for palette files */
nuclear@26:    png_uint_16 red;   /* for use in red green blue files */
nuclear@26:    png_uint_16 green;
nuclear@26:    png_uint_16 blue;
nuclear@26:    png_uint_16 gray;  /* for use in grayscale files */
nuclear@26: } png_color_16;
nuclear@26: typedef png_color_16 FAR * png_color_16p;
nuclear@26: typedef png_color_16 FAR * FAR * png_color_16pp;
nuclear@26: 
nuclear@26: typedef struct png_color_8_struct
nuclear@26: {
nuclear@26:    png_byte red;   /* for use in red green blue files */
nuclear@26:    png_byte green;
nuclear@26:    png_byte blue;
nuclear@26:    png_byte gray;  /* for use in grayscale files */
nuclear@26:    png_byte alpha; /* for alpha channel files */
nuclear@26: } png_color_8;
nuclear@26: typedef png_color_8 FAR * png_color_8p;
nuclear@26: typedef png_color_8 FAR * FAR * png_color_8pp;
nuclear@26: 
nuclear@26: /*
nuclear@26:  * The following two structures are used for the in-core representation
nuclear@26:  * of sPLT chunks.
nuclear@26:  */
nuclear@26: typedef struct png_sPLT_entry_struct
nuclear@26: {
nuclear@26:    png_uint_16 red;
nuclear@26:    png_uint_16 green;
nuclear@26:    png_uint_16 blue;
nuclear@26:    png_uint_16 alpha;
nuclear@26:    png_uint_16 frequency;
nuclear@26: } png_sPLT_entry;
nuclear@26: typedef png_sPLT_entry FAR * png_sPLT_entryp;
nuclear@26: typedef png_sPLT_entry FAR * FAR * png_sPLT_entrypp;
nuclear@26: 
nuclear@26: /*  When the depth of the sPLT palette is 8 bits, the color and alpha samples
nuclear@26:  *  occupy the LSB of their respective members, and the MSB of each member
nuclear@26:  *  is zero-filled.  The frequency member always occupies the full 16 bits.
nuclear@26:  */
nuclear@26: 
nuclear@26: typedef struct png_sPLT_struct
nuclear@26: {
nuclear@26:    png_charp name;           /* palette name */
nuclear@26:    png_byte depth;           /* depth of palette samples */
nuclear@26:    png_sPLT_entryp entries;  /* palette entries */
nuclear@26:    png_int_32 nentries;      /* number of palette entries */
nuclear@26: } png_sPLT_t;
nuclear@26: typedef png_sPLT_t FAR * png_sPLT_tp;
nuclear@26: typedef png_sPLT_t FAR * FAR * png_sPLT_tpp;
nuclear@26: 
nuclear@26: #ifdef PNG_TEXT_SUPPORTED
nuclear@26: /* png_text holds the contents of a text/ztxt/itxt chunk in a PNG file,
nuclear@26:  * and whether that contents is compressed or not.  The "key" field
nuclear@26:  * points to a regular zero-terminated C string.  The "text", "lang", and
nuclear@26:  * "lang_key" fields can be regular C strings, empty strings, or NULL pointers.
nuclear@26:  * However, the * structure returned by png_get_text() will always contain
nuclear@26:  * regular zero-terminated C strings (possibly empty), never NULL pointers,
nuclear@26:  * so they can be safely used in printf() and other string-handling functions.
nuclear@26:  */
nuclear@26: typedef struct png_text_struct
nuclear@26: {
nuclear@26:    int  compression;       /* compression value:
nuclear@26:                              -1: tEXt, none
nuclear@26:                               0: zTXt, deflate
nuclear@26:                               1: iTXt, none
nuclear@26:                               2: iTXt, deflate  */
nuclear@26:    png_charp key;          /* keyword, 1-79 character description of "text" */
nuclear@26:    png_charp text;         /* comment, may be an empty string (ie "")
nuclear@26:                               or a NULL pointer */
nuclear@26:    png_size_t text_length; /* length of the text string */
nuclear@26: #ifdef PNG_iTXt_SUPPORTED
nuclear@26:    png_size_t itxt_length; /* length of the itxt string */
nuclear@26:    png_charp lang;         /* language code, 0-79 characters
nuclear@26:                               or a NULL pointer */
nuclear@26:    png_charp lang_key;     /* keyword translated UTF-8 string, 0 or more
nuclear@26:                               chars or a NULL pointer */
nuclear@26: #endif
nuclear@26: } png_text;
nuclear@26: typedef png_text FAR * png_textp;
nuclear@26: typedef png_text FAR * FAR * png_textpp;
nuclear@26: #endif
nuclear@26: 
nuclear@26: /* Supported compression types for text in PNG files (tEXt, and zTXt).
nuclear@26:  * The values of the PNG_TEXT_COMPRESSION_ defines should NOT be changed. */
nuclear@26: #define PNG_TEXT_COMPRESSION_NONE_WR -3
nuclear@26: #define PNG_TEXT_COMPRESSION_zTXt_WR -2
nuclear@26: #define PNG_TEXT_COMPRESSION_NONE    -1
nuclear@26: #define PNG_TEXT_COMPRESSION_zTXt     0
nuclear@26: #define PNG_ITXT_COMPRESSION_NONE     1
nuclear@26: #define PNG_ITXT_COMPRESSION_zTXt     2
nuclear@26: #define PNG_TEXT_COMPRESSION_LAST     3  /* Not a valid value */
nuclear@26: 
nuclear@26: /* png_time is a way to hold the time in an machine independent way.
nuclear@26:  * Two conversions are provided, both from time_t and struct tm.  There
nuclear@26:  * is no portable way to convert to either of these structures, as far
nuclear@26:  * as I know.  If you know of a portable way, send it to me.  As a side
nuclear@26:  * note - PNG has always been Year 2000 compliant!
nuclear@26:  */
nuclear@26: typedef struct png_time_struct
nuclear@26: {
nuclear@26:    png_uint_16 year; /* full year, as in, 1995 */
nuclear@26:    png_byte month;   /* month of year, 1 - 12 */
nuclear@26:    png_byte day;     /* day of month, 1 - 31 */
nuclear@26:    png_byte hour;    /* hour of day, 0 - 23 */
nuclear@26:    png_byte minute;  /* minute of hour, 0 - 59 */
nuclear@26:    png_byte second;  /* second of minute, 0 - 60 (for leap seconds) */
nuclear@26: } png_time;
nuclear@26: typedef png_time FAR * png_timep;
nuclear@26: typedef png_time FAR * FAR * png_timepp;
nuclear@26: 
nuclear@26: #if defined(PNG_UNKNOWN_CHUNKS_SUPPORTED)
nuclear@26: /* png_unknown_chunk is a structure to hold queued chunks for which there is
nuclear@26:  * no specific support.  The idea is that we can use this to queue
nuclear@26:  * up private chunks for output even though the library doesn't actually
nuclear@26:  * know about their semantics.
nuclear@26:  */
nuclear@26: #define PNG_CHUNK_NAME_LENGTH 5
nuclear@26: typedef struct png_unknown_chunk_t
nuclear@26: {
nuclear@26:     png_byte name[PNG_CHUNK_NAME_LENGTH];
nuclear@26:     png_byte *data;
nuclear@26:     png_size_t size;
nuclear@26: 
nuclear@26:     /* libpng-using applications should NOT directly modify this byte. */
nuclear@26:     png_byte location; /* mode of operation at read time */
nuclear@26: }
nuclear@26: png_unknown_chunk;
nuclear@26: typedef png_unknown_chunk FAR * png_unknown_chunkp;
nuclear@26: typedef png_unknown_chunk FAR * FAR * png_unknown_chunkpp;
nuclear@26: #endif
nuclear@26: 
nuclear@26: /* png_info is a structure that holds the information in a PNG file so
nuclear@26:  * that the application can find out the characteristics of the image.
nuclear@26:  * If you are reading the file, this structure will tell you what is
nuclear@26:  * in the PNG file.  If you are writing the file, fill in the information
nuclear@26:  * you want to put into the PNG file, then call png_write_info().
nuclear@26:  * The names chosen should be very close to the PNG specification, so
nuclear@26:  * consult that document for information about the meaning of each field.
nuclear@26:  *
nuclear@26:  * With libpng < 0.95, it was only possible to directly set and read the
nuclear@26:  * the values in the png_info_struct, which meant that the contents and
nuclear@26:  * order of the values had to remain fixed.  With libpng 0.95 and later,
nuclear@26:  * however, there are now functions that abstract the contents of
nuclear@26:  * png_info_struct from the application, so this makes it easier to use
nuclear@26:  * libpng with dynamic libraries, and even makes it possible to use
nuclear@26:  * libraries that don't have all of the libpng ancillary chunk-handing
nuclear@26:  * functionality.
nuclear@26:  *
nuclear@26:  * In any case, the order of the parameters in png_info_struct should NOT
nuclear@26:  * be changed for as long as possible to keep compatibility with applications
nuclear@26:  * that use the old direct-access method with png_info_struct.
nuclear@26:  *
nuclear@26:  * The following members may have allocated storage attached that should be
nuclear@26:  * cleaned up before the structure is discarded: palette, trans, text,
nuclear@26:  * pcal_purpose, pcal_units, pcal_params, hist, iccp_name, iccp_profile,
nuclear@26:  * splt_palettes, scal_unit, row_pointers, and unknowns.   By default, these
nuclear@26:  * are automatically freed when the info structure is deallocated, if they were
nuclear@26:  * allocated internally by libpng.  This behavior can be changed by means
nuclear@26:  * of the png_data_freer() function.
nuclear@26:  *
nuclear@26:  * More allocation details: all the chunk-reading functions that
nuclear@26:  * change these members go through the corresponding png_set_*
nuclear@26:  * functions.  A function to clear these members is available: see
nuclear@26:  * png_free_data().  The png_set_* functions do not depend on being
nuclear@26:  * able to point info structure members to any of the storage they are
nuclear@26:  * passed (they make their own copies), EXCEPT that the png_set_text
nuclear@26:  * functions use the same storage passed to them in the text_ptr or
nuclear@26:  * itxt_ptr structure argument, and the png_set_rows and png_set_unknowns
nuclear@26:  * functions do not make their own copies.
nuclear@26:  */
nuclear@26: typedef struct png_info_struct
nuclear@26: {
nuclear@26:    /* the following are necessary for every PNG file */
nuclear@26:    png_uint_32 width;       /* width of image in pixels (from IHDR) */
nuclear@26:    png_uint_32 height;      /* height of image in pixels (from IHDR) */
nuclear@26:    png_uint_32 valid;       /* valid chunk data (see PNG_INFO_ below) */
nuclear@26:    png_uint_32 rowbytes;    /* bytes needed to hold an untransformed row */
nuclear@26:    png_colorp palette;      /* array of color values (valid & PNG_INFO_PLTE) */
nuclear@26:    png_uint_16 num_palette; /* number of color entries in "palette" (PLTE) */
nuclear@26:    png_uint_16 num_trans;   /* number of transparent palette color (tRNS) */
nuclear@26:    png_byte bit_depth;      /* 1, 2, 4, 8, or 16 bits/channel (from IHDR) */
nuclear@26:    png_byte color_type;     /* see PNG_COLOR_TYPE_ below (from IHDR) */
nuclear@26:    /* The following three should have been named *_method not *_type */
nuclear@26:    png_byte compression_type; /* must be PNG_COMPRESSION_TYPE_BASE (IHDR) */
nuclear@26:    png_byte filter_type;    /* must be PNG_FILTER_TYPE_BASE (from IHDR) */
nuclear@26:    png_byte interlace_type; /* One of PNG_INTERLACE_NONE, PNG_INTERLACE_ADAM7 */
nuclear@26: 
nuclear@26:    /* The following is informational only on read, and not used on writes. */
nuclear@26:    png_byte channels;       /* number of data channels per pixel (1, 2, 3, 4) */
nuclear@26:    png_byte pixel_depth;    /* number of bits per pixel */
nuclear@26:    png_byte spare_byte;     /* to align the data, and for future use */
nuclear@26:    png_byte signature[8];   /* magic bytes read by libpng from start of file */
nuclear@26: 
nuclear@26:    /* The rest of the data is optional.  If you are reading, check the
nuclear@26:     * valid field to see if the information in these are valid.  If you
nuclear@26:     * are writing, set the valid field to those chunks you want written,
nuclear@26:     * and initialize the appropriate fields below.
nuclear@26:     */
nuclear@26: 
nuclear@26: #if defined(PNG_gAMA_SUPPORTED) && defined(PNG_FLOATING_POINT_SUPPORTED)
nuclear@26:    /* The gAMA chunk describes the gamma characteristics of the system
nuclear@26:     * on which the image was created, normally in the range [1.0, 2.5].
nuclear@26:     * Data is valid if (valid & PNG_INFO_gAMA) is non-zero.
nuclear@26:     */
nuclear@26:    float gamma; /* gamma value of image, if (valid & PNG_INFO_gAMA) */
nuclear@26: #endif
nuclear@26: 
nuclear@26: #if defined(PNG_sRGB_SUPPORTED)
nuclear@26:     /* GR-P, 0.96a */
nuclear@26:     /* Data valid if (valid & PNG_INFO_sRGB) non-zero. */
nuclear@26:    png_byte srgb_intent; /* sRGB rendering intent [0, 1, 2, or 3] */
nuclear@26: #endif
nuclear@26: 
nuclear@26: #if defined(PNG_TEXT_SUPPORTED)
nuclear@26:    /* The tEXt, and zTXt chunks contain human-readable textual data in
nuclear@26:     * uncompressed, compressed, and optionally compressed forms, respectively.
nuclear@26:     * The data in "text" is an array of pointers to uncompressed,
nuclear@26:     * null-terminated C strings. Each chunk has a keyword that describes the
nuclear@26:     * textual data contained in that chunk.  Keywords are not required to be
nuclear@26:     * unique, and the text string may be empty.  Any number of text chunks may
nuclear@26:     * be in an image.
nuclear@26:     */
nuclear@26:    int num_text; /* number of comments read/to write */
nuclear@26:    int max_text; /* current size of text array */
nuclear@26:    png_textp text; /* array of comments read/to write */
nuclear@26: #endif /* PNG_TEXT_SUPPORTED */
nuclear@26: 
nuclear@26: #if defined(PNG_tIME_SUPPORTED)
nuclear@26:    /* The tIME chunk holds the last time the displayed image data was
nuclear@26:     * modified.  See the png_time struct for the contents of this struct.
nuclear@26:     */
nuclear@26:    png_time mod_time;
nuclear@26: #endif
nuclear@26: 
nuclear@26: #if defined(PNG_sBIT_SUPPORTED)
nuclear@26:    /* The sBIT chunk specifies the number of significant high-order bits
nuclear@26:     * in the pixel data.  Values are in the range [1, bit_depth], and are
nuclear@26:     * only specified for the channels in the pixel data.  The contents of
nuclear@26:     * the low-order bits is not specified.  Data is valid if
nuclear@26:     * (valid & PNG_INFO_sBIT) is non-zero.
nuclear@26:     */
nuclear@26:    png_color_8 sig_bit; /* significant bits in color channels */
nuclear@26: #endif
nuclear@26: 
nuclear@26: #if defined(PNG_tRNS_SUPPORTED) || defined(PNG_READ_EXPAND_SUPPORTED) || \
nuclear@26: defined(PNG_READ_BACKGROUND_SUPPORTED)
nuclear@26:    /* The tRNS chunk supplies transparency data for paletted images and
nuclear@26:     * other image types that don't need a full alpha channel.  There are
nuclear@26:     * "num_trans" transparency values for a paletted image, stored in the
nuclear@26:     * same order as the palette colors, starting from index 0.  Values
nuclear@26:     * for the data are in the range [0, 255], ranging from fully transparent
nuclear@26:     * to fully opaque, respectively.  For non-paletted images, there is a
nuclear@26:     * single color specified that should be treated as fully transparent.
nuclear@26:     * Data is valid if (valid & PNG_INFO_tRNS) is non-zero.
nuclear@26:     */
nuclear@26:    png_bytep trans; /* transparent values for paletted image */
nuclear@26:    png_color_16 trans_values; /* transparent color for non-palette image */
nuclear@26: #endif
nuclear@26: 
nuclear@26: #if defined(PNG_bKGD_SUPPORTED) || defined(PNG_READ_BACKGROUND_SUPPORTED)
nuclear@26:    /* The bKGD chunk gives the suggested image background color if the
nuclear@26:     * display program does not have its own background color and the image
nuclear@26:     * is needs to composited onto a background before display.  The colors
nuclear@26:     * in "background" are normally in the same color space/depth as the
nuclear@26:     * pixel data.  Data is valid if (valid & PNG_INFO_bKGD) is non-zero.
nuclear@26:     */
nuclear@26:    png_color_16 background;
nuclear@26: #endif
nuclear@26: 
nuclear@26: #if defined(PNG_oFFs_SUPPORTED)
nuclear@26:    /* The oFFs chunk gives the offset in "offset_unit_type" units rightwards
nuclear@26:     * and downwards from the top-left corner of the display, page, or other
nuclear@26:     * application-specific co-ordinate space.  See the PNG_OFFSET_ defines
nuclear@26:     * below for the unit types.  Valid if (valid & PNG_INFO_oFFs) non-zero.
nuclear@26:     */
nuclear@26:    png_int_32 x_offset; /* x offset on page */
nuclear@26:    png_int_32 y_offset; /* y offset on page */
nuclear@26:    png_byte offset_unit_type; /* offset units type */
nuclear@26: #endif
nuclear@26: 
nuclear@26: #if defined(PNG_pHYs_SUPPORTED)
nuclear@26:    /* The pHYs chunk gives the physical pixel density of the image for
nuclear@26:     * display or printing in "phys_unit_type" units (see PNG_RESOLUTION_
nuclear@26:     * defines below).  Data is valid if (valid & PNG_INFO_pHYs) is non-zero.
nuclear@26:     */
nuclear@26:    png_uint_32 x_pixels_per_unit; /* horizontal pixel density */
nuclear@26:    png_uint_32 y_pixels_per_unit; /* vertical pixel density */
nuclear@26:    png_byte phys_unit_type; /* resolution type (see PNG_RESOLUTION_ below) */
nuclear@26: #endif
nuclear@26: 
nuclear@26: #if defined(PNG_hIST_SUPPORTED)
nuclear@26:    /* The hIST chunk contains the relative frequency or importance of the
nuclear@26:     * various palette entries, so that a viewer can intelligently select a
nuclear@26:     * reduced-color palette, if required.  Data is an array of "num_palette"
nuclear@26:     * values in the range [0,65535]. Data valid if (valid & PNG_INFO_hIST)
nuclear@26:     * is non-zero.
nuclear@26:     */
nuclear@26:    png_uint_16p hist;
nuclear@26: #endif
nuclear@26: 
nuclear@26: #ifdef PNG_cHRM_SUPPORTED
nuclear@26:    /* The cHRM chunk describes the CIE color characteristics of the monitor
nuclear@26:     * on which the PNG was created.  This data allows the viewer to do gamut
nuclear@26:     * mapping of the input image to ensure that the viewer sees the same
nuclear@26:     * colors in the image as the creator.  Values are in the range
nuclear@26:     * [0.0, 0.8].  Data valid if (valid & PNG_INFO_cHRM) non-zero.
nuclear@26:     */
nuclear@26: #ifdef PNG_FLOATING_POINT_SUPPORTED
nuclear@26:    float x_white;
nuclear@26:    float y_white;
nuclear@26:    float x_red;
nuclear@26:    float y_red;
nuclear@26:    float x_green;
nuclear@26:    float y_green;
nuclear@26:    float x_blue;
nuclear@26:    float y_blue;
nuclear@26: #endif
nuclear@26: #endif
nuclear@26: 
nuclear@26: #if defined(PNG_pCAL_SUPPORTED)
nuclear@26:    /* The pCAL chunk describes a transformation between the stored pixel
nuclear@26:     * values and original physical data values used to create the image.
nuclear@26:     * The integer range [0, 2^bit_depth - 1] maps to the floating-point
nuclear@26:     * range given by [pcal_X0, pcal_X1], and are further transformed by a
nuclear@26:     * (possibly non-linear) transformation function given by "pcal_type"
nuclear@26:     * and "pcal_params" into "pcal_units".  Please see the PNG_EQUATION_
nuclear@26:     * defines below, and the PNG-Group's PNG extensions document for a
nuclear@26:     * complete description of the transformations and how they should be
nuclear@26:     * implemented, and for a description of the ASCII parameter strings.
nuclear@26:     * Data values are valid if (valid & PNG_INFO_pCAL) non-zero.
nuclear@26:     */
nuclear@26:    png_charp pcal_purpose;  /* pCAL chunk description string */
nuclear@26:    png_int_32 pcal_X0;      /* minimum value */
nuclear@26:    png_int_32 pcal_X1;      /* maximum value */
nuclear@26:    png_charp pcal_units;    /* Latin-1 string giving physical units */
nuclear@26:    png_charpp pcal_params;  /* ASCII strings containing parameter values */
nuclear@26:    png_byte pcal_type;      /* equation type (see PNG_EQUATION_ below) */
nuclear@26:    png_byte pcal_nparams;   /* number of parameters given in pcal_params */
nuclear@26: #endif
nuclear@26: 
nuclear@26: /* New members added in libpng-1.0.6 */
nuclear@26: #ifdef PNG_FREE_ME_SUPPORTED
nuclear@26:    png_uint_32 free_me;     /* flags items libpng is responsible for freeing */
nuclear@26: #endif
nuclear@26: 
nuclear@26: #if defined(PNG_UNKNOWN_CHUNKS_SUPPORTED)
nuclear@26:    /* storage for unknown chunks that the library doesn't recognize. */
nuclear@26:    png_unknown_chunkp unknown_chunks;
nuclear@26:    png_size_t unknown_chunks_num;
nuclear@26: #endif
nuclear@26: 
nuclear@26: #if defined(PNG_iCCP_SUPPORTED)
nuclear@26:    /* iCCP chunk data. */
nuclear@26:    png_charp iccp_name;     /* profile name */
nuclear@26:    png_charp iccp_profile;  /* International Color Consortium profile data */
nuclear@26:                             /* Note to maintainer: should be png_bytep */
nuclear@26:    png_uint_32 iccp_proflen;  /* ICC profile data length */
nuclear@26:    png_byte iccp_compression; /* Always zero */
nuclear@26: #endif
nuclear@26: 
nuclear@26: #if defined(PNG_sPLT_SUPPORTED)
nuclear@26:    /* data on sPLT chunks (there may be more than one). */
nuclear@26:    png_sPLT_tp splt_palettes;
nuclear@26:    png_uint_32 splt_palettes_num;
nuclear@26: #endif
nuclear@26: 
nuclear@26: #if defined(PNG_sCAL_SUPPORTED)
nuclear@26:    /* The sCAL chunk describes the actual physical dimensions of the
nuclear@26:     * subject matter of the graphic.  The chunk contains a unit specification
nuclear@26:     * a byte value, and two ASCII strings representing floating-point
nuclear@26:     * values.  The values are width and height corresponsing to one pixel
nuclear@26:     * in the image.  This external representation is converted to double
nuclear@26:     * here.  Data values are valid if (valid & PNG_INFO_sCAL) is non-zero.
nuclear@26:     */
nuclear@26:    png_byte scal_unit;         /* unit of physical scale */
nuclear@26: #ifdef PNG_FLOATING_POINT_SUPPORTED
nuclear@26:    double scal_pixel_width;    /* width of one pixel */
nuclear@26:    double scal_pixel_height;   /* height of one pixel */
nuclear@26: #endif
nuclear@26: #ifdef PNG_FIXED_POINT_SUPPORTED
nuclear@26:    png_charp scal_s_width;     /* string containing height */
nuclear@26:    png_charp scal_s_height;    /* string containing width */
nuclear@26: #endif
nuclear@26: #endif
nuclear@26: 
nuclear@26: #if defined(PNG_INFO_IMAGE_SUPPORTED)
nuclear@26:    /* Memory has been allocated if (valid & PNG_ALLOCATED_INFO_ROWS) non-zero */
nuclear@26:    /* Data valid if (valid & PNG_INFO_IDAT) non-zero */
nuclear@26:    png_bytepp row_pointers;        /* the image bits */
nuclear@26: #endif
nuclear@26: 
nuclear@26: #if defined(PNG_FIXED_POINT_SUPPORTED) && defined(PNG_gAMA_SUPPORTED)
nuclear@26:    png_fixed_point int_gamma; /* gamma of image, if (valid & PNG_INFO_gAMA) */
nuclear@26: #endif
nuclear@26: 
nuclear@26: #if defined(PNG_cHRM_SUPPORTED) && defined(PNG_FIXED_POINT_SUPPORTED)
nuclear@26:    png_fixed_point int_x_white;
nuclear@26:    png_fixed_point int_y_white;
nuclear@26:    png_fixed_point int_x_red;
nuclear@26:    png_fixed_point int_y_red;
nuclear@26:    png_fixed_point int_x_green;
nuclear@26:    png_fixed_point int_y_green;
nuclear@26:    png_fixed_point int_x_blue;
nuclear@26:    png_fixed_point int_y_blue;
nuclear@26: #endif
nuclear@26: 
nuclear@26: } png_info;
nuclear@26: 
nuclear@26: typedef png_info FAR * png_infop;
nuclear@26: typedef png_info FAR * FAR * png_infopp;
nuclear@26: 
nuclear@26: /* Maximum positive integer used in PNG is (2^31)-1 */
nuclear@26: #define PNG_UINT_31_MAX ((png_uint_32)0x7fffffffL)
nuclear@26: #define PNG_UINT_32_MAX ((png_uint_32)(-1))
nuclear@26: #define PNG_SIZE_MAX ((png_size_t)(-1))
nuclear@26: #if defined(PNG_1_0_X) || defined (PNG_1_2_X)
nuclear@26: /* PNG_MAX_UINT is deprecated; use PNG_UINT_31_MAX instead. */
nuclear@26: #define PNG_MAX_UINT PNG_UINT_31_MAX
nuclear@26: #endif
nuclear@26: 
nuclear@26: /* These describe the color_type field in png_info. */
nuclear@26: /* color type masks */
nuclear@26: #define PNG_COLOR_MASK_PALETTE    1
nuclear@26: #define PNG_COLOR_MASK_COLOR      2
nuclear@26: #define PNG_COLOR_MASK_ALPHA      4
nuclear@26: 
nuclear@26: /* color types.  Note that not all combinations are legal */
nuclear@26: #define PNG_COLOR_TYPE_GRAY 0
nuclear@26: #define PNG_COLOR_TYPE_PALETTE  (PNG_COLOR_MASK_COLOR | PNG_COLOR_MASK_PALETTE)
nuclear@26: #define PNG_COLOR_TYPE_RGB        (PNG_COLOR_MASK_COLOR)
nuclear@26: #define PNG_COLOR_TYPE_RGB_ALPHA  (PNG_COLOR_MASK_COLOR | PNG_COLOR_MASK_ALPHA)
nuclear@26: #define PNG_COLOR_TYPE_GRAY_ALPHA (PNG_COLOR_MASK_ALPHA)
nuclear@26: /* aliases */
nuclear@26: #define PNG_COLOR_TYPE_RGBA  PNG_COLOR_TYPE_RGB_ALPHA
nuclear@26: #define PNG_COLOR_TYPE_GA  PNG_COLOR_TYPE_GRAY_ALPHA
nuclear@26: 
nuclear@26: /* This is for compression type. PNG 1.0-1.2 only define the single type. */
nuclear@26: #define PNG_COMPRESSION_TYPE_BASE 0 /* Deflate method 8, 32K window */
nuclear@26: #define PNG_COMPRESSION_TYPE_DEFAULT PNG_COMPRESSION_TYPE_BASE
nuclear@26: 
nuclear@26: /* This is for filter type. PNG 1.0-1.2 only define the single type. */
nuclear@26: #define PNG_FILTER_TYPE_BASE      0 /* Single row per-byte filtering */
nuclear@26: #define PNG_INTRAPIXEL_DIFFERENCING 64 /* Used only in MNG datastreams */
nuclear@26: #define PNG_FILTER_TYPE_DEFAULT   PNG_FILTER_TYPE_BASE
nuclear@26: 
nuclear@26: /* These are for the interlacing type.  These values should NOT be changed. */
nuclear@26: #define PNG_INTERLACE_NONE        0 /* Non-interlaced image */
nuclear@26: #define PNG_INTERLACE_ADAM7       1 /* Adam7 interlacing */
nuclear@26: #define PNG_INTERLACE_LAST        2 /* Not a valid value */
nuclear@26: 
nuclear@26: /* These are for the oFFs chunk.  These values should NOT be changed. */
nuclear@26: #define PNG_OFFSET_PIXEL          0 /* Offset in pixels */
nuclear@26: #define PNG_OFFSET_MICROMETER     1 /* Offset in micrometers (1/10^6 meter) */
nuclear@26: #define PNG_OFFSET_LAST           2 /* Not a valid value */
nuclear@26: 
nuclear@26: /* These are for the pCAL chunk.  These values should NOT be changed. */
nuclear@26: #define PNG_EQUATION_LINEAR       0 /* Linear transformation */
nuclear@26: #define PNG_EQUATION_BASE_E       1 /* Exponential base e transform */
nuclear@26: #define PNG_EQUATION_ARBITRARY    2 /* Arbitrary base exponential transform */
nuclear@26: #define PNG_EQUATION_HYPERBOLIC   3 /* Hyperbolic sine transformation */
nuclear@26: #define PNG_EQUATION_LAST         4 /* Not a valid value */
nuclear@26: 
nuclear@26: /* These are for the sCAL chunk.  These values should NOT be changed. */
nuclear@26: #define PNG_SCALE_UNKNOWN         0 /* unknown unit (image scale) */
nuclear@26: #define PNG_SCALE_METER           1 /* meters per pixel */
nuclear@26: #define PNG_SCALE_RADIAN          2 /* radians per pixel */
nuclear@26: #define PNG_SCALE_LAST            3 /* Not a valid value */
nuclear@26: 
nuclear@26: /* These are for the pHYs chunk.  These values should NOT be changed. */
nuclear@26: #define PNG_RESOLUTION_UNKNOWN    0 /* pixels/unknown unit (aspect ratio) */
nuclear@26: #define PNG_RESOLUTION_METER      1 /* pixels/meter */
nuclear@26: #define PNG_RESOLUTION_LAST       2 /* Not a valid value */
nuclear@26: 
nuclear@26: /* These are for the sRGB chunk.  These values should NOT be changed. */
nuclear@26: #define PNG_sRGB_INTENT_PERCEPTUAL 0
nuclear@26: #define PNG_sRGB_INTENT_RELATIVE   1
nuclear@26: #define PNG_sRGB_INTENT_SATURATION 2
nuclear@26: #define PNG_sRGB_INTENT_ABSOLUTE   3
nuclear@26: #define PNG_sRGB_INTENT_LAST       4 /* Not a valid value */
nuclear@26: 
nuclear@26: /* This is for text chunks */
nuclear@26: #define PNG_KEYWORD_MAX_LENGTH     79
nuclear@26: 
nuclear@26: /* Maximum number of entries in PLTE/sPLT/tRNS arrays */
nuclear@26: #define PNG_MAX_PALETTE_LENGTH    256
nuclear@26: 
nuclear@26: /* These determine if an ancillary chunk's data has been successfully read
nuclear@26:  * from the PNG header, or if the application has filled in the corresponding
nuclear@26:  * data in the info_struct to be written into the output file.  The values
nuclear@26:  * of the PNG_INFO_<chunk> defines should NOT be changed.
nuclear@26:  */
nuclear@26: #define PNG_INFO_gAMA 0x0001
nuclear@26: #define PNG_INFO_sBIT 0x0002
nuclear@26: #define PNG_INFO_cHRM 0x0004
nuclear@26: #define PNG_INFO_PLTE 0x0008
nuclear@26: #define PNG_INFO_tRNS 0x0010
nuclear@26: #define PNG_INFO_bKGD 0x0020
nuclear@26: #define PNG_INFO_hIST 0x0040
nuclear@26: #define PNG_INFO_pHYs 0x0080
nuclear@26: #define PNG_INFO_oFFs 0x0100
nuclear@26: #define PNG_INFO_tIME 0x0200
nuclear@26: #define PNG_INFO_pCAL 0x0400
nuclear@26: #define PNG_INFO_sRGB 0x0800   /* GR-P, 0.96a */
nuclear@26: #define PNG_INFO_iCCP 0x1000   /* ESR, 1.0.6 */
nuclear@26: #define PNG_INFO_sPLT 0x2000   /* ESR, 1.0.6 */
nuclear@26: #define PNG_INFO_sCAL 0x4000   /* ESR, 1.0.6 */
nuclear@26: #define PNG_INFO_IDAT 0x8000L  /* ESR, 1.0.6 */
nuclear@26: 
nuclear@26: /* This is used for the transformation routines, as some of them
nuclear@26:  * change these values for the row.  It also should enable using
nuclear@26:  * the routines for other purposes.
nuclear@26:  */
nuclear@26: typedef struct png_row_info_struct
nuclear@26: {
nuclear@26:    png_uint_32 width; /* width of row */
nuclear@26:    png_uint_32 rowbytes; /* number of bytes in row */
nuclear@26:    png_byte color_type; /* color type of row */
nuclear@26:    png_byte bit_depth; /* bit depth of row */
nuclear@26:    png_byte channels; /* number of channels (1, 2, 3, or 4) */
nuclear@26:    png_byte pixel_depth; /* bits per pixel (depth * channels) */
nuclear@26: } png_row_info;
nuclear@26: 
nuclear@26: typedef png_row_info FAR * png_row_infop;
nuclear@26: typedef png_row_info FAR * FAR * png_row_infopp;
nuclear@26: 
nuclear@26: /* These are the function types for the I/O functions and for the functions
nuclear@26:  * that allow the user to override the default I/O functions with his or her
nuclear@26:  * own.  The png_error_ptr type should match that of user-supplied warning
nuclear@26:  * and error functions, while the png_rw_ptr type should match that of the
nuclear@26:  * user read/write data functions.
nuclear@26:  */
nuclear@26: typedef struct png_struct_def png_struct;
nuclear@26: typedef png_struct FAR * png_structp;
nuclear@26: 
nuclear@26: typedef void (PNGAPI *png_error_ptr) PNGARG((png_structp, png_const_charp));
nuclear@26: typedef void (PNGAPI *png_rw_ptr) PNGARG((png_structp, png_bytep, png_size_t));
nuclear@26: typedef void (PNGAPI *png_flush_ptr) PNGARG((png_structp));
nuclear@26: typedef void (PNGAPI *png_read_status_ptr) PNGARG((png_structp, png_uint_32,
nuclear@26:    int));
nuclear@26: typedef void (PNGAPI *png_write_status_ptr) PNGARG((png_structp, png_uint_32,
nuclear@26:    int));
nuclear@26: 
nuclear@26: #ifdef PNG_PROGRESSIVE_READ_SUPPORTED
nuclear@26: typedef void (PNGAPI *png_progressive_info_ptr) PNGARG((png_structp, png_infop));
nuclear@26: typedef void (PNGAPI *png_progressive_end_ptr) PNGARG((png_structp, png_infop));
nuclear@26: typedef void (PNGAPI *png_progressive_row_ptr) PNGARG((png_structp, png_bytep,
nuclear@26:    png_uint_32, int));
nuclear@26: #endif
nuclear@26: 
nuclear@26: #if defined(PNG_READ_USER_TRANSFORM_SUPPORTED) || \
nuclear@26:     defined(PNG_WRITE_USER_TRANSFORM_SUPPORTED) || \
nuclear@26:     defined(PNG_LEGACY_SUPPORTED)
nuclear@26: typedef void (PNGAPI *png_user_transform_ptr) PNGARG((png_structp,
nuclear@26:     png_row_infop, png_bytep));
nuclear@26: #endif
nuclear@26: 
nuclear@26: #if defined(PNG_USER_CHUNKS_SUPPORTED)
nuclear@26: typedef int (PNGAPI *png_user_chunk_ptr) PNGARG((png_structp, png_unknown_chunkp));
nuclear@26: #endif
nuclear@26: #if defined(PNG_UNKNOWN_CHUNKS_SUPPORTED)
nuclear@26: typedef void (PNGAPI *png_unknown_chunk_ptr) PNGARG((png_structp));
nuclear@26: #endif
nuclear@26: 
nuclear@26: /* Transform masks for the high-level interface */
nuclear@26: #define PNG_TRANSFORM_IDENTITY       0x0000    /* read and write */
nuclear@26: #define PNG_TRANSFORM_STRIP_16       0x0001    /* read only */
nuclear@26: #define PNG_TRANSFORM_STRIP_ALPHA    0x0002    /* read only */
nuclear@26: #define PNG_TRANSFORM_PACKING        0x0004    /* read and write */
nuclear@26: #define PNG_TRANSFORM_PACKSWAP       0x0008    /* read and write */
nuclear@26: #define PNG_TRANSFORM_EXPAND         0x0010    /* read only */
nuclear@26: #define PNG_TRANSFORM_INVERT_MONO    0x0020    /* read and write */
nuclear@26: #define PNG_TRANSFORM_SHIFT          0x0040    /* read and write */
nuclear@26: #define PNG_TRANSFORM_BGR            0x0080    /* read and write */
nuclear@26: #define PNG_TRANSFORM_SWAP_ALPHA     0x0100    /* read and write */
nuclear@26: #define PNG_TRANSFORM_SWAP_ENDIAN    0x0200    /* read and write */
nuclear@26: #define PNG_TRANSFORM_INVERT_ALPHA   0x0400    /* read and write */
nuclear@26: #define PNG_TRANSFORM_STRIP_FILLER   0x0800    /* WRITE only */
nuclear@26: 
nuclear@26: /* Flags for MNG supported features */
nuclear@26: #define PNG_FLAG_MNG_EMPTY_PLTE     0x01
nuclear@26: #define PNG_FLAG_MNG_FILTER_64      0x04
nuclear@26: #define PNG_ALL_MNG_FEATURES        0x05
nuclear@26: 
nuclear@26: typedef png_voidp (*png_malloc_ptr) PNGARG((png_structp, png_size_t));
nuclear@26: typedef void (*png_free_ptr) PNGARG((png_structp, png_voidp));
nuclear@26: 
nuclear@26: /* The structure that holds the information to read and write PNG files.
nuclear@26:  * The only people who need to care about what is inside of this are the
nuclear@26:  * people who will be modifying the library for their own special needs.
nuclear@26:  * It should NOT be accessed directly by an application, except to store
nuclear@26:  * the jmp_buf.
nuclear@26:  */
nuclear@26: 
nuclear@26: struct png_struct_def
nuclear@26: {
nuclear@26: #ifdef PNG_SETJMP_SUPPORTED
nuclear@26:    jmp_buf jmpbuf;            /* used in png_error */
nuclear@26: #endif
nuclear@26:    png_error_ptr error_fn;    /* function for printing errors and aborting */
nuclear@26:    png_error_ptr warning_fn;  /* function for printing warnings */
nuclear@26:    png_voidp error_ptr;       /* user supplied struct for error functions */
nuclear@26:    png_rw_ptr write_data_fn;  /* function for writing output data */
nuclear@26:    png_rw_ptr read_data_fn;   /* function for reading input data */
nuclear@26:    png_voidp io_ptr;          /* ptr to application struct for I/O functions */
nuclear@26: 
nuclear@26: #if defined(PNG_READ_USER_TRANSFORM_SUPPORTED)
nuclear@26:    png_user_transform_ptr read_user_transform_fn; /* user read transform */
nuclear@26: #endif
nuclear@26: 
nuclear@26: #if defined(PNG_WRITE_USER_TRANSFORM_SUPPORTED)
nuclear@26:    png_user_transform_ptr write_user_transform_fn; /* user write transform */
nuclear@26: #endif
nuclear@26: 
nuclear@26: /* These were added in libpng-1.0.2 */
nuclear@26: #if defined(PNG_USER_TRANSFORM_PTR_SUPPORTED)
nuclear@26: #if defined(PNG_READ_USER_TRANSFORM_SUPPORTED) || \
nuclear@26:     defined(PNG_WRITE_USER_TRANSFORM_SUPPORTED)
nuclear@26:    png_voidp user_transform_ptr; /* user supplied struct for user transform */
nuclear@26:    png_byte user_transform_depth;    /* bit depth of user transformed pixels */
nuclear@26:    png_byte user_transform_channels; /* channels in user transformed pixels */
nuclear@26: #endif
nuclear@26: #endif
nuclear@26: 
nuclear@26:    png_uint_32 mode;          /* tells us where we are in the PNG file */
nuclear@26:    png_uint_32 flags;         /* flags indicating various things to libpng */
nuclear@26:    png_uint_32 transformations; /* which transformations to perform */
nuclear@26: 
nuclear@26:    z_stream zstream;          /* pointer to decompression structure (below) */
nuclear@26:    png_bytep zbuf;            /* buffer for zlib */
nuclear@26:    png_size_t zbuf_size;      /* size of zbuf */
nuclear@26:    int zlib_level;            /* holds zlib compression level */
nuclear@26:    int zlib_method;           /* holds zlib compression method */
nuclear@26:    int zlib_window_bits;      /* holds zlib compression window bits */
nuclear@26:    int zlib_mem_level;        /* holds zlib compression memory level */
nuclear@26:    int zlib_strategy;         /* holds zlib compression strategy */
nuclear@26: 
nuclear@26:    png_uint_32 width;         /* width of image in pixels */
nuclear@26:    png_uint_32 height;        /* height of image in pixels */
nuclear@26:    png_uint_32 num_rows;      /* number of rows in current pass */
nuclear@26:    png_uint_32 usr_width;     /* width of row at start of write */
nuclear@26:    png_uint_32 rowbytes;      /* size of row in bytes */
nuclear@26:    png_uint_32 irowbytes;     /* size of current interlaced row in bytes */
nuclear@26:    png_uint_32 iwidth;        /* width of current interlaced row in pixels */
nuclear@26:    png_uint_32 row_number;    /* current row in interlace pass */
nuclear@26:    png_bytep prev_row;        /* buffer to save previous (unfiltered) row */
nuclear@26:    png_bytep row_buf;         /* buffer to save current (unfiltered) row */
nuclear@26: #ifndef PNG_NO_WRITE_FILTER
nuclear@26:    png_bytep sub_row;         /* buffer to save "sub" row when filtering */
nuclear@26:    png_bytep up_row;          /* buffer to save "up" row when filtering */
nuclear@26:    png_bytep avg_row;         /* buffer to save "avg" row when filtering */
nuclear@26:    png_bytep paeth_row;       /* buffer to save "Paeth" row when filtering */
nuclear@26: #endif
nuclear@26:    png_row_info row_info;     /* used for transformation routines */
nuclear@26: 
nuclear@26:    png_uint_32 idat_size;     /* current IDAT size for read */
nuclear@26:    png_uint_32 crc;           /* current chunk CRC value */
nuclear@26:    png_colorp palette;        /* palette from the input file */
nuclear@26:    png_uint_16 num_palette;   /* number of color entries in palette */
nuclear@26:    png_uint_16 num_trans;     /* number of transparency values */
nuclear@26:    png_byte chunk_name[5];    /* null-terminated name of current chunk */
nuclear@26:    png_byte compression;      /* file compression type (always 0) */
nuclear@26:    png_byte filter;           /* file filter type (always 0) */
nuclear@26:    png_byte interlaced;       /* PNG_INTERLACE_NONE, PNG_INTERLACE_ADAM7 */
nuclear@26:    png_byte pass;             /* current interlace pass (0 - 6) */
nuclear@26:    png_byte do_filter;        /* row filter flags (see PNG_FILTER_ below ) */
nuclear@26:    png_byte color_type;       /* color type of file */
nuclear@26:    png_byte bit_depth;        /* bit depth of file */
nuclear@26:    png_byte usr_bit_depth;    /* bit depth of users row */
nuclear@26:    png_byte pixel_depth;      /* number of bits per pixel */
nuclear@26:    png_byte channels;         /* number of channels in file */
nuclear@26:    png_byte usr_channels;     /* channels at start of write */
nuclear@26:    png_byte sig_bytes;        /* magic bytes read/written from start of file */
nuclear@26: 
nuclear@26: #if defined(PNG_READ_FILLER_SUPPORTED) || defined(PNG_WRITE_FILLER_SUPPORTED)
nuclear@26: #ifdef PNG_LEGACY_SUPPORTED
nuclear@26:    png_byte filler;           /* filler byte for pixel expansion */
nuclear@26: #else
nuclear@26:    png_uint_16 filler;           /* filler bytes for pixel expansion */
nuclear@26: #endif
nuclear@26: #endif
nuclear@26: 
nuclear@26: #if defined(PNG_bKGD_SUPPORTED)
nuclear@26:    png_byte background_gamma_type;
nuclear@26: #  ifdef PNG_FLOATING_POINT_SUPPORTED
nuclear@26:    float background_gamma;
nuclear@26: #  endif
nuclear@26:    png_color_16 background;   /* background color in screen gamma space */
nuclear@26: #if defined(PNG_READ_GAMMA_SUPPORTED)
nuclear@26:    png_color_16 background_1; /* background normalized to gamma 1.0 */
nuclear@26: #endif
nuclear@26: #endif /* PNG_bKGD_SUPPORTED */
nuclear@26: 
nuclear@26: #if defined(PNG_WRITE_FLUSH_SUPPORTED)
nuclear@26:    png_flush_ptr output_flush_fn;/* Function for flushing output */
nuclear@26:    png_uint_32 flush_dist;    /* how many rows apart to flush, 0 - no flush */
nuclear@26:    png_uint_32 flush_rows;    /* number of rows written since last flush */
nuclear@26: #endif
nuclear@26: 
nuclear@26: #if defined(PNG_READ_GAMMA_SUPPORTED) || defined(PNG_READ_BACKGROUND_SUPPORTED)
nuclear@26:    int gamma_shift;      /* number of "insignificant" bits 16-bit gamma */
nuclear@26: #ifdef PNG_FLOATING_POINT_SUPPORTED
nuclear@26:    float gamma;          /* file gamma value */
nuclear@26:    float screen_gamma;   /* screen gamma value (display_exponent) */
nuclear@26: #endif
nuclear@26: #endif
nuclear@26: 
nuclear@26: #if defined(PNG_READ_GAMMA_SUPPORTED) || defined(PNG_READ_BACKGROUND_SUPPORTED)
nuclear@26:    png_bytep gamma_table;     /* gamma table for 8-bit depth files */
nuclear@26:    png_bytep gamma_from_1;    /* converts from 1.0 to screen */
nuclear@26:    png_bytep gamma_to_1;      /* converts from file to 1.0 */
nuclear@26:    png_uint_16pp gamma_16_table; /* gamma table for 16-bit depth files */
nuclear@26:    png_uint_16pp gamma_16_from_1; /* converts from 1.0 to screen */
nuclear@26:    png_uint_16pp gamma_16_to_1; /* converts from file to 1.0 */
nuclear@26: #endif
nuclear@26: 
nuclear@26: #if defined(PNG_READ_GAMMA_SUPPORTED) || defined(PNG_sBIT_SUPPORTED)
nuclear@26:    png_color_8 sig_bit;       /* significant bits in each available channel */
nuclear@26: #endif
nuclear@26: 
nuclear@26: #if defined(PNG_READ_SHIFT_SUPPORTED) || defined(PNG_WRITE_SHIFT_SUPPORTED)
nuclear@26:    png_color_8 shift;         /* shift for significant bit tranformation */
nuclear@26: #endif
nuclear@26: 
nuclear@26: #if defined(PNG_tRNS_SUPPORTED) || defined(PNG_READ_BACKGROUND_SUPPORTED) \
nuclear@26:  || defined(PNG_READ_EXPAND_SUPPORTED) || defined(PNG_READ_BACKGROUND_SUPPORTED)
nuclear@26:    png_bytep trans;           /* transparency values for paletted files */
nuclear@26:    png_color_16 trans_values; /* transparency values for non-paletted files */
nuclear@26: #endif
nuclear@26: 
nuclear@26:    png_read_status_ptr read_row_fn;   /* called after each row is decoded */
nuclear@26:    png_write_status_ptr write_row_fn; /* called after each row is encoded */
nuclear@26: #ifdef PNG_PROGRESSIVE_READ_SUPPORTED
nuclear@26:    png_progressive_info_ptr info_fn; /* called after header data fully read */
nuclear@26:    png_progressive_row_ptr row_fn;   /* called after each prog. row is decoded */
nuclear@26:    png_progressive_end_ptr end_fn;   /* called after image is complete */
nuclear@26:    png_bytep save_buffer_ptr;        /* current location in save_buffer */
nuclear@26:    png_bytep save_buffer;            /* buffer for previously read data */
nuclear@26:    png_bytep current_buffer_ptr;     /* current location in current_buffer */
nuclear@26:    png_bytep current_buffer;         /* buffer for recently used data */
nuclear@26:    png_uint_32 push_length;          /* size of current input chunk */
nuclear@26:    png_uint_32 skip_length;          /* bytes to skip in input data */
nuclear@26:    png_size_t save_buffer_size;      /* amount of data now in save_buffer */
nuclear@26:    png_size_t save_buffer_max;       /* total size of save_buffer */
nuclear@26:    png_size_t buffer_size;           /* total amount of available input data */
nuclear@26:    png_size_t current_buffer_size;   /* amount of data now in current_buffer */
nuclear@26:    int process_mode;                 /* what push library is currently doing */
nuclear@26:    int cur_palette;                  /* current push library palette index */
nuclear@26: 
nuclear@26: #  if defined(PNG_TEXT_SUPPORTED)
nuclear@26:      png_size_t current_text_size;   /* current size of text input data */
nuclear@26:      png_size_t current_text_left;   /* how much text left to read in input */
nuclear@26:      png_charp current_text;         /* current text chunk buffer */
nuclear@26:      png_charp current_text_ptr;     /* current location in current_text */
nuclear@26: #  endif /* PNG_TEXT_SUPPORTED */
nuclear@26: #endif /* PNG_PROGRESSIVE_READ_SUPPORTED */
nuclear@26: 
nuclear@26: #if defined(__TURBOC__) && !defined(_Windows) && !defined(__FLAT__)
nuclear@26: /* for the Borland special 64K segment handler */
nuclear@26:    png_bytepp offset_table_ptr;
nuclear@26:    png_bytep offset_table;
nuclear@26:    png_uint_16 offset_table_number;
nuclear@26:    png_uint_16 offset_table_count;
nuclear@26:    png_uint_16 offset_table_count_free;
nuclear@26: #endif
nuclear@26: 
nuclear@26: #if defined(PNG_READ_DITHER_SUPPORTED)
nuclear@26:    png_bytep palette_lookup;         /* lookup table for dithering */
nuclear@26:    png_bytep dither_index;           /* index translation for palette files */
nuclear@26: #endif
nuclear@26: 
nuclear@26: #if defined(PNG_READ_DITHER_SUPPORTED) || defined(PNG_hIST_SUPPORTED)
nuclear@26:    png_uint_16p hist;                /* histogram */
nuclear@26: #endif
nuclear@26: 
nuclear@26: #if defined(PNG_WRITE_WEIGHTED_FILTER_SUPPORTED)
nuclear@26:    png_byte heuristic_method;        /* heuristic for row filter selection */
nuclear@26:    png_byte num_prev_filters;        /* number of weights for previous rows */
nuclear@26:    png_bytep prev_filters;           /* filter type(s) of previous row(s) */
nuclear@26:    png_uint_16p filter_weights;      /* weight(s) for previous line(s) */
nuclear@26:    png_uint_16p inv_filter_weights;  /* 1/weight(s) for previous line(s) */
nuclear@26:    png_uint_16p filter_costs;        /* relative filter calculation cost */
nuclear@26:    png_uint_16p inv_filter_costs;    /* 1/relative filter calculation cost */
nuclear@26: #endif
nuclear@26: 
nuclear@26: #if defined(PNG_TIME_RFC1123_SUPPORTED)
nuclear@26:    png_charp time_buffer;            /* String to hold RFC 1123 time text */
nuclear@26: #endif
nuclear@26: 
nuclear@26: /* New members added in libpng-1.0.6 */
nuclear@26: 
nuclear@26: #ifdef PNG_FREE_ME_SUPPORTED
nuclear@26:    png_uint_32 free_me;       /* flags items libpng is responsible for freeing */
nuclear@26: #endif
nuclear@26: 
nuclear@26: #if defined(PNG_USER_CHUNKS_SUPPORTED)
nuclear@26:    png_voidp user_chunk_ptr;
nuclear@26:    png_user_chunk_ptr read_user_chunk_fn; /* user read chunk handler */
nuclear@26: #endif
nuclear@26: 
nuclear@26: #if defined(PNG_UNKNOWN_CHUNKS_SUPPORTED)
nuclear@26:    int num_chunk_list;
nuclear@26:    png_bytep chunk_list;
nuclear@26: #endif
nuclear@26: 
nuclear@26: /* New members added in libpng-1.0.3 */
nuclear@26: #if defined(PNG_READ_RGB_TO_GRAY_SUPPORTED)
nuclear@26:    png_byte rgb_to_gray_status;
nuclear@26:    /* These were changed from png_byte in libpng-1.0.6 */
nuclear@26:    png_uint_16 rgb_to_gray_red_coeff;
nuclear@26:    png_uint_16 rgb_to_gray_green_coeff;
nuclear@26:    png_uint_16 rgb_to_gray_blue_coeff;
nuclear@26: #endif
nuclear@26: 
nuclear@26: /* New member added in libpng-1.0.4 (renamed in 1.0.9) */
nuclear@26: #if defined(PNG_MNG_FEATURES_SUPPORTED) || \
nuclear@26:     defined(PNG_READ_EMPTY_PLTE_SUPPORTED) || \
nuclear@26:     defined(PNG_WRITE_EMPTY_PLTE_SUPPORTED)
nuclear@26: /* changed from png_byte to png_uint_32 at version 1.2.0 */
nuclear@26: #ifdef PNG_1_0_X
nuclear@26:    png_byte mng_features_permitted;
nuclear@26: #else
nuclear@26:    png_uint_32 mng_features_permitted;
nuclear@26: #endif /* PNG_1_0_X */
nuclear@26: #endif
nuclear@26: 
nuclear@26: /* New member added in libpng-1.0.7 */
nuclear@26: #if defined(PNG_READ_GAMMA_SUPPORTED) || defined(PNG_READ_BACKGROUND_SUPPORTED)
nuclear@26:    png_fixed_point int_gamma;
nuclear@26: #endif
nuclear@26: 
nuclear@26: /* New member added in libpng-1.0.9, ifdef'ed out in 1.0.12, enabled in 1.2.0 */
nuclear@26: #if defined(PNG_MNG_FEATURES_SUPPORTED)
nuclear@26:    png_byte filter_type;
nuclear@26: #endif
nuclear@26: 
nuclear@26: #if defined(PNG_1_0_X)
nuclear@26: /* New member added in libpng-1.0.10, ifdef'ed out in 1.2.0 */
nuclear@26:    png_uint_32 row_buf_size;
nuclear@26: #endif
nuclear@26: 
nuclear@26: /* New members added in libpng-1.2.0 */
nuclear@26: #if defined(PNG_ASSEMBLER_CODE_SUPPORTED)
nuclear@26: #  if !defined(PNG_1_0_X)
nuclear@26: #    if defined(PNG_MMX_CODE_SUPPORTED)
nuclear@26:    png_byte     mmx_bitdepth_threshold;
nuclear@26:    png_uint_32  mmx_rowbytes_threshold;
nuclear@26: #    endif
nuclear@26:    png_uint_32  asm_flags;
nuclear@26: #  endif
nuclear@26: #endif
nuclear@26: 
nuclear@26: /* New members added in libpng-1.0.2 but first enabled by default in 1.2.0 */
nuclear@26: #ifdef PNG_USER_MEM_SUPPORTED
nuclear@26:    png_voidp mem_ptr;                /* user supplied struct for mem functions */
nuclear@26:    png_malloc_ptr malloc_fn;         /* function for allocating memory */
nuclear@26:    png_free_ptr free_fn;             /* function for freeing memory */
nuclear@26: #endif
nuclear@26: 
nuclear@26: /* New member added in libpng-1.0.13 and 1.2.0 */
nuclear@26:    png_bytep big_row_buf;         /* buffer to save current (unfiltered) row */
nuclear@26: 
nuclear@26: #if defined(PNG_READ_DITHER_SUPPORTED)
nuclear@26: /* The following three members were added at version 1.0.14 and 1.2.4 */
nuclear@26:    png_bytep dither_sort;            /* working sort array */
nuclear@26:    png_bytep index_to_palette;       /* where the original index currently is */
nuclear@26:                                      /* in the palette */
nuclear@26:    png_bytep palette_to_index;       /* which original index points to this */
nuclear@26:                                      /* palette color */
nuclear@26: #endif
nuclear@26: 
nuclear@26: /* New members added in libpng-1.0.16 and 1.2.6 */
nuclear@26:    png_byte compression_type;
nuclear@26: 
nuclear@26: #ifdef PNG_SET_USER_LIMITS_SUPPORTED
nuclear@26:    png_uint_32 user_width_max;
nuclear@26:    png_uint_32 user_height_max;
nuclear@26: #endif
nuclear@26: 
nuclear@26: /* New member added in libpng-1.0.25 and 1.2.17 */
nuclear@26: #if defined(PNG_UNKNOWN_CHUNKS_SUPPORTED)
nuclear@26:    /* storage for unknown chunk that the library doesn't recognize. */
nuclear@26:    png_unknown_chunk unknown_chunk;
nuclear@26: #endif
nuclear@26: 
nuclear@26: /* New members added in libpng-1.2.26 */
nuclear@26:   png_uint_32 old_big_row_buf_size, old_prev_row_size;
nuclear@26: 
nuclear@26: /* New member added in libpng-1.2.30 */
nuclear@26:   png_charp chunkdata;  /* buffer for reading chunk data */
nuclear@26: 
nuclear@26: };
nuclear@26: 
nuclear@26: 
nuclear@26: /* This triggers a compiler error in png.c, if png.c and png.h
nuclear@26:  * do not agree upon the version number.
nuclear@26:  */
nuclear@26: typedef png_structp version_1_2_33;
nuclear@26: 
nuclear@26: typedef png_struct FAR * FAR * png_structpp;
nuclear@26: 
nuclear@26: /* Here are the function definitions most commonly used.  This is not
nuclear@26:  * the place to find out how to use libpng.  See libpng.txt for the
nuclear@26:  * full explanation, see example.c for the summary.  This just provides
nuclear@26:  * a simple one line description of the use of each function.
nuclear@26:  */
nuclear@26: 
nuclear@26: /* Returns the version number of the library */
nuclear@26: extern PNG_EXPORT(png_uint_32,png_access_version_number) PNGARG((void));
nuclear@26: 
nuclear@26: /* Tell lib we have already handled the first <num_bytes> magic bytes.
nuclear@26:  * Handling more than 8 bytes from the beginning of the file is an error.
nuclear@26:  */
nuclear@26: extern PNG_EXPORT(void,png_set_sig_bytes) PNGARG((png_structp png_ptr,
nuclear@26:    int num_bytes));
nuclear@26: 
nuclear@26: /* Check sig[start] through sig[start + num_to_check - 1] to see if it's a
nuclear@26:  * PNG file.  Returns zero if the supplied bytes match the 8-byte PNG
nuclear@26:  * signature, and non-zero otherwise.  Having num_to_check == 0 or
nuclear@26:  * start > 7 will always fail (ie return non-zero).
nuclear@26:  */
nuclear@26: extern PNG_EXPORT(int,png_sig_cmp) PNGARG((png_bytep sig, png_size_t start,
nuclear@26:    png_size_t num_to_check));
nuclear@26: 
nuclear@26: /* Simple signature checking function.  This is the same as calling
nuclear@26:  * png_check_sig(sig, n) := !png_sig_cmp(sig, 0, n).
nuclear@26:  */
nuclear@26: extern PNG_EXPORT(int,png_check_sig) PNGARG((png_bytep sig, int num));
nuclear@26: 
nuclear@26: /* Allocate and initialize png_ptr struct for reading, and any other memory. */
nuclear@26: extern PNG_EXPORT(png_structp,png_create_read_struct)
nuclear@26:    PNGARG((png_const_charp user_png_ver, png_voidp error_ptr,
nuclear@26:    png_error_ptr error_fn, png_error_ptr warn_fn));
nuclear@26: 
nuclear@26: /* Allocate and initialize png_ptr struct for writing, and any other memory */
nuclear@26: extern PNG_EXPORT(png_structp,png_create_write_struct)
nuclear@26:    PNGARG((png_const_charp user_png_ver, png_voidp error_ptr,
nuclear@26:    png_error_ptr error_fn, png_error_ptr warn_fn));
nuclear@26: 
nuclear@26: #ifdef PNG_WRITE_SUPPORTED
nuclear@26: extern PNG_EXPORT(png_uint_32,png_get_compression_buffer_size)
nuclear@26:    PNGARG((png_structp png_ptr));
nuclear@26: #endif
nuclear@26: 
nuclear@26: #ifdef PNG_WRITE_SUPPORTED
nuclear@26: extern PNG_EXPORT(void,png_set_compression_buffer_size)
nuclear@26:    PNGARG((png_structp png_ptr, png_uint_32 size));
nuclear@26: #endif
nuclear@26: 
nuclear@26: /* Reset the compression stream */
nuclear@26: extern PNG_EXPORT(int,png_reset_zstream) PNGARG((png_structp png_ptr));
nuclear@26: 
nuclear@26: /* New functions added in libpng-1.0.2 (not enabled by default until 1.2.0) */
nuclear@26: #ifdef PNG_USER_MEM_SUPPORTED
nuclear@26: extern PNG_EXPORT(png_structp,png_create_read_struct_2)
nuclear@26:    PNGARG((png_const_charp user_png_ver, png_voidp error_ptr,
nuclear@26:    png_error_ptr error_fn, png_error_ptr warn_fn, png_voidp mem_ptr,
nuclear@26:    png_malloc_ptr malloc_fn, png_free_ptr free_fn));
nuclear@26: extern PNG_EXPORT(png_structp,png_create_write_struct_2)
nuclear@26:    PNGARG((png_const_charp user_png_ver, png_voidp error_ptr,
nuclear@26:    png_error_ptr error_fn, png_error_ptr warn_fn, png_voidp mem_ptr,
nuclear@26:    png_malloc_ptr malloc_fn, png_free_ptr free_fn));
nuclear@26: #endif
nuclear@26: 
nuclear@26: /* Write a PNG chunk - size, type, (optional) data, CRC. */
nuclear@26: extern PNG_EXPORT(void,png_write_chunk) PNGARG((png_structp png_ptr,
nuclear@26:    png_bytep chunk_name, png_bytep data, png_size_t length));
nuclear@26: 
nuclear@26: /* Write the start of a PNG chunk - length and chunk name. */
nuclear@26: extern PNG_EXPORT(void,png_write_chunk_start) PNGARG((png_structp png_ptr,
nuclear@26:    png_bytep chunk_name, png_uint_32 length));
nuclear@26: 
nuclear@26: /* Write the data of a PNG chunk started with png_write_chunk_start(). */
nuclear@26: extern PNG_EXPORT(void,png_write_chunk_data) PNGARG((png_structp png_ptr,
nuclear@26:    png_bytep data, png_size_t length));
nuclear@26: 
nuclear@26: /* Finish a chunk started with png_write_chunk_start() (includes CRC). */
nuclear@26: extern PNG_EXPORT(void,png_write_chunk_end) PNGARG((png_structp png_ptr));
nuclear@26: 
nuclear@26: /* Allocate and initialize the info structure */
nuclear@26: extern PNG_EXPORT(png_infop,png_create_info_struct)
nuclear@26:    PNGARG((png_structp png_ptr));
nuclear@26: 
nuclear@26: #if defined(PNG_1_0_X) || defined (PNG_1_2_X)
nuclear@26: /* Initialize the info structure (old interface - DEPRECATED) */
nuclear@26: extern PNG_EXPORT(void,png_info_init) PNGARG((png_infop info_ptr));
nuclear@26: #undef png_info_init
nuclear@26: #define png_info_init(info_ptr) png_info_init_3(&info_ptr,\
nuclear@26:     png_sizeof(png_info));
nuclear@26: #endif
nuclear@26: 
nuclear@26: extern PNG_EXPORT(void,png_info_init_3) PNGARG((png_infopp info_ptr,
nuclear@26:     png_size_t png_info_struct_size));
nuclear@26: 
nuclear@26: /* Writes all the PNG information before the image. */
nuclear@26: extern PNG_EXPORT(void,png_write_info_before_PLTE) PNGARG((png_structp png_ptr,
nuclear@26:    png_infop info_ptr));
nuclear@26: extern PNG_EXPORT(void,png_write_info) PNGARG((png_structp png_ptr,
nuclear@26:    png_infop info_ptr));
nuclear@26: 
nuclear@26: #ifndef PNG_NO_SEQUENTIAL_READ_SUPPORTED
nuclear@26: /* read the information before the actual image data. */
nuclear@26: extern PNG_EXPORT(void,png_read_info) PNGARG((png_structp png_ptr,
nuclear@26:    png_infop info_ptr));
nuclear@26: #endif
nuclear@26: 
nuclear@26: #if defined(PNG_TIME_RFC1123_SUPPORTED)
nuclear@26: extern PNG_EXPORT(png_charp,png_convert_to_rfc1123)
nuclear@26:    PNGARG((png_structp png_ptr, png_timep ptime));
nuclear@26: #endif
nuclear@26: 
nuclear@26: #if !defined(_WIN32_WCE)
nuclear@26: /* "time.h" functions are not supported on WindowsCE */
nuclear@26: #if defined(PNG_WRITE_tIME_SUPPORTED)
nuclear@26: /* convert from a struct tm to png_time */
nuclear@26: extern PNG_EXPORT(void,png_convert_from_struct_tm) PNGARG((png_timep ptime,
nuclear@26:    struct tm FAR * ttime));
nuclear@26: 
nuclear@26: /* convert from time_t to png_time.  Uses gmtime() */
nuclear@26: extern PNG_EXPORT(void,png_convert_from_time_t) PNGARG((png_timep ptime,
nuclear@26:    time_t ttime));
nuclear@26: #endif /* PNG_WRITE_tIME_SUPPORTED */
nuclear@26: #endif /* _WIN32_WCE */
nuclear@26: 
nuclear@26: #if defined(PNG_READ_EXPAND_SUPPORTED)
nuclear@26: /* Expand data to 24-bit RGB, or 8-bit grayscale, with alpha if available. */
nuclear@26: extern PNG_EXPORT(void,png_set_expand) PNGARG((png_structp png_ptr));
nuclear@26: #if !defined(PNG_1_0_X)
nuclear@26: extern PNG_EXPORT(void,png_set_expand_gray_1_2_4_to_8) PNGARG((png_structp
nuclear@26:   png_ptr));
nuclear@26: #endif
nuclear@26: extern PNG_EXPORT(void,png_set_palette_to_rgb) PNGARG((png_structp png_ptr));
nuclear@26: extern PNG_EXPORT(void,png_set_tRNS_to_alpha) PNGARG((png_structp png_ptr));
nuclear@26: #if defined(PNG_1_0_X) || defined (PNG_1_2_X)
nuclear@26: /* Deprecated */
nuclear@26: extern PNG_EXPORT(void,png_set_gray_1_2_4_to_8) PNGARG((png_structp png_ptr));
nuclear@26: #endif
nuclear@26: #endif
nuclear@26: 
nuclear@26: #if defined(PNG_READ_BGR_SUPPORTED) || defined(PNG_WRITE_BGR_SUPPORTED)
nuclear@26: /* Use blue, green, red order for pixels. */
nuclear@26: extern PNG_EXPORT(void,png_set_bgr) PNGARG((png_structp png_ptr));
nuclear@26: #endif
nuclear@26: 
nuclear@26: #if defined(PNG_READ_GRAY_TO_RGB_SUPPORTED)
nuclear@26: /* Expand the grayscale to 24-bit RGB if necessary. */
nuclear@26: extern PNG_EXPORT(void,png_set_gray_to_rgb) PNGARG((png_structp png_ptr));
nuclear@26: #endif
nuclear@26: 
nuclear@26: #if defined(PNG_READ_RGB_TO_GRAY_SUPPORTED)
nuclear@26: /* Reduce RGB to grayscale. */
nuclear@26: #ifdef PNG_FLOATING_POINT_SUPPORTED
nuclear@26: extern PNG_EXPORT(void,png_set_rgb_to_gray) PNGARG((png_structp png_ptr,
nuclear@26:    int error_action, double red, double green ));
nuclear@26: #endif
nuclear@26: extern PNG_EXPORT(void,png_set_rgb_to_gray_fixed) PNGARG((png_structp png_ptr,
nuclear@26:    int error_action, png_fixed_point red, png_fixed_point green ));
nuclear@26: extern PNG_EXPORT(png_byte,png_get_rgb_to_gray_status) PNGARG((png_structp
nuclear@26:    png_ptr));
nuclear@26: #endif
nuclear@26: 
nuclear@26: extern PNG_EXPORT(void,png_build_grayscale_palette) PNGARG((int bit_depth,
nuclear@26:    png_colorp palette));
nuclear@26: 
nuclear@26: #if defined(PNG_READ_STRIP_ALPHA_SUPPORTED)
nuclear@26: extern PNG_EXPORT(void,png_set_strip_alpha) PNGARG((png_structp png_ptr));
nuclear@26: #endif
nuclear@26: 
nuclear@26: #if defined(PNG_READ_SWAP_ALPHA_SUPPORTED) || \
nuclear@26:     defined(PNG_WRITE_SWAP_ALPHA_SUPPORTED)
nuclear@26: extern PNG_EXPORT(void,png_set_swap_alpha) PNGARG((png_structp png_ptr));
nuclear@26: #endif
nuclear@26: 
nuclear@26: #if defined(PNG_READ_INVERT_ALPHA_SUPPORTED) || \
nuclear@26:     defined(PNG_WRITE_INVERT_ALPHA_SUPPORTED)
nuclear@26: extern PNG_EXPORT(void,png_set_invert_alpha) PNGARG((png_structp png_ptr));
nuclear@26: #endif
nuclear@26: 
nuclear@26: #if defined(PNG_READ_FILLER_SUPPORTED) || defined(PNG_WRITE_FILLER_SUPPORTED)
nuclear@26: /* Add a filler byte to 8-bit Gray or 24-bit RGB images. */
nuclear@26: extern PNG_EXPORT(void,png_set_filler) PNGARG((png_structp png_ptr,
nuclear@26:    png_uint_32 filler, int flags));
nuclear@26: /* The values of the PNG_FILLER_ defines should NOT be changed */
nuclear@26: #define PNG_FILLER_BEFORE 0
nuclear@26: #define PNG_FILLER_AFTER 1
nuclear@26: /* Add an alpha byte to 8-bit Gray or 24-bit RGB images. */
nuclear@26: #if !defined(PNG_1_0_X)
nuclear@26: extern PNG_EXPORT(void,png_set_add_alpha) PNGARG((png_structp png_ptr,
nuclear@26:    png_uint_32 filler, int flags));
nuclear@26: #endif
nuclear@26: #endif /* PNG_READ_FILLER_SUPPORTED || PNG_WRITE_FILLER_SUPPORTED */
nuclear@26: 
nuclear@26: #if defined(PNG_READ_SWAP_SUPPORTED) || defined(PNG_WRITE_SWAP_SUPPORTED)
nuclear@26: /* Swap bytes in 16-bit depth files. */
nuclear@26: extern PNG_EXPORT(void,png_set_swap) PNGARG((png_structp png_ptr));
nuclear@26: #endif
nuclear@26: 
nuclear@26: #if defined(PNG_READ_PACK_SUPPORTED) || defined(PNG_WRITE_PACK_SUPPORTED)
nuclear@26: /* Use 1 byte per pixel in 1, 2, or 4-bit depth files. */
nuclear@26: extern PNG_EXPORT(void,png_set_packing) PNGARG((png_structp png_ptr));
nuclear@26: #endif
nuclear@26: 
nuclear@26: #if defined(PNG_READ_PACKSWAP_SUPPORTED) || defined(PNG_WRITE_PACKSWAP_SUPPORTED)
nuclear@26: /* Swap packing order of pixels in bytes. */
nuclear@26: extern PNG_EXPORT(void,png_set_packswap) PNGARG((png_structp png_ptr));
nuclear@26: #endif
nuclear@26: 
nuclear@26: #if defined(PNG_READ_SHIFT_SUPPORTED) || defined(PNG_WRITE_SHIFT_SUPPORTED)
nuclear@26: /* Converts files to legal bit depths. */
nuclear@26: extern PNG_EXPORT(void,png_set_shift) PNGARG((png_structp png_ptr,
nuclear@26:    png_color_8p true_bits));
nuclear@26: #endif
nuclear@26: 
nuclear@26: #if defined(PNG_READ_INTERLACING_SUPPORTED) || \
nuclear@26:     defined(PNG_WRITE_INTERLACING_SUPPORTED)
nuclear@26: /* Have the code handle the interlacing.  Returns the number of passes. */
nuclear@26: extern PNG_EXPORT(int,png_set_interlace_handling) PNGARG((png_structp png_ptr));
nuclear@26: #endif
nuclear@26: 
nuclear@26: #if defined(PNG_READ_INVERT_SUPPORTED) || defined(PNG_WRITE_INVERT_SUPPORTED)
nuclear@26: /* Invert monochrome files */
nuclear@26: extern PNG_EXPORT(void,png_set_invert_mono) PNGARG((png_structp png_ptr));
nuclear@26: #endif
nuclear@26: 
nuclear@26: #if defined(PNG_READ_BACKGROUND_SUPPORTED)
nuclear@26: /* Handle alpha and tRNS by replacing with a background color. */
nuclear@26: #ifdef PNG_FLOATING_POINT_SUPPORTED
nuclear@26: extern PNG_EXPORT(void,png_set_background) PNGARG((png_structp png_ptr,
nuclear@26:    png_color_16p background_color, int background_gamma_code,
nuclear@26:    int need_expand, double background_gamma));
nuclear@26: #endif
nuclear@26: #define PNG_BACKGROUND_GAMMA_UNKNOWN 0
nuclear@26: #define PNG_BACKGROUND_GAMMA_SCREEN  1
nuclear@26: #define PNG_BACKGROUND_GAMMA_FILE    2
nuclear@26: #define PNG_BACKGROUND_GAMMA_UNIQUE  3
nuclear@26: #endif
nuclear@26: 
nuclear@26: #if defined(PNG_READ_16_TO_8_SUPPORTED)
nuclear@26: /* strip the second byte of information from a 16-bit depth file. */
nuclear@26: extern PNG_EXPORT(void,png_set_strip_16) PNGARG((png_structp png_ptr));
nuclear@26: #endif
nuclear@26: 
nuclear@26: #if defined(PNG_READ_DITHER_SUPPORTED)
nuclear@26: /* Turn on dithering, and reduce the palette to the number of colors available. */
nuclear@26: extern PNG_EXPORT(void,png_set_dither) PNGARG((png_structp png_ptr,
nuclear@26:    png_colorp palette, int num_palette, int maximum_colors,
nuclear@26:    png_uint_16p histogram, int full_dither));
nuclear@26: #endif
nuclear@26: 
nuclear@26: #if defined(PNG_READ_GAMMA_SUPPORTED)
nuclear@26: /* Handle gamma correction. Screen_gamma=(display_exponent) */
nuclear@26: #ifdef PNG_FLOATING_POINT_SUPPORTED
nuclear@26: extern PNG_EXPORT(void,png_set_gamma) PNGARG((png_structp png_ptr,
nuclear@26:    double screen_gamma, double default_file_gamma));
nuclear@26: #endif
nuclear@26: #endif
nuclear@26: 
nuclear@26: #if defined(PNG_1_0_X) || defined (PNG_1_2_X)
nuclear@26: #if defined(PNG_READ_EMPTY_PLTE_SUPPORTED) || \
nuclear@26:     defined(PNG_WRITE_EMPTY_PLTE_SUPPORTED)
nuclear@26: /* Permit or disallow empty PLTE (0: not permitted, 1: permitted) */
nuclear@26: /* Deprecated and will be removed.  Use png_permit_mng_features() instead. */
nuclear@26: extern PNG_EXPORT(void,png_permit_empty_plte) PNGARG((png_structp png_ptr,
nuclear@26:    int empty_plte_permitted));
nuclear@26: #endif
nuclear@26: #endif
nuclear@26: 
nuclear@26: #if defined(PNG_WRITE_FLUSH_SUPPORTED)
nuclear@26: /* Set how many lines between output flushes - 0 for no flushing */
nuclear@26: extern PNG_EXPORT(void,png_set_flush) PNGARG((png_structp png_ptr, int nrows));
nuclear@26: /* Flush the current PNG output buffer */
nuclear@26: extern PNG_EXPORT(void,png_write_flush) PNGARG((png_structp png_ptr));
nuclear@26: #endif
nuclear@26: 
nuclear@26: /* optional update palette with requested transformations */
nuclear@26: extern PNG_EXPORT(void,png_start_read_image) PNGARG((png_structp png_ptr));
nuclear@26: 
nuclear@26: /* optional call to update the users info structure */
nuclear@26: extern PNG_EXPORT(void,png_read_update_info) PNGARG((png_structp png_ptr,
nuclear@26:    png_infop info_ptr));
nuclear@26: 
nuclear@26: #ifndef PNG_NO_SEQUENTIAL_READ_SUPPORTED
nuclear@26: /* read one or more rows of image data. */
nuclear@26: extern PNG_EXPORT(void,png_read_rows) PNGARG((png_structp png_ptr,
nuclear@26:    png_bytepp row, png_bytepp display_row, png_uint_32 num_rows));
nuclear@26: #endif
nuclear@26: 
nuclear@26: #ifndef PNG_NO_SEQUENTIAL_READ_SUPPORTED
nuclear@26: /* read a row of data. */
nuclear@26: extern PNG_EXPORT(void,png_read_row) PNGARG((png_structp png_ptr,
nuclear@26:    png_bytep row,
nuclear@26:    png_bytep display_row));
nuclear@26: #endif
nuclear@26: 
nuclear@26: #ifndef PNG_NO_SEQUENTIAL_READ_SUPPORTED
nuclear@26: /* read the whole image into memory at once. */
nuclear@26: extern PNG_EXPORT(void,png_read_image) PNGARG((png_structp png_ptr,
nuclear@26:    png_bytepp image));
nuclear@26: #endif
nuclear@26: 
nuclear@26: /* write a row of image data */
nuclear@26: extern PNG_EXPORT(void,png_write_row) PNGARG((png_structp png_ptr,
nuclear@26:    png_bytep row));
nuclear@26: 
nuclear@26: /* write a few rows of image data */
nuclear@26: extern PNG_EXPORT(void,png_write_rows) PNGARG((png_structp png_ptr,
nuclear@26:    png_bytepp row, png_uint_32 num_rows));
nuclear@26: 
nuclear@26: /* write the image data */
nuclear@26: extern PNG_EXPORT(void,png_write_image) PNGARG((png_structp png_ptr,
nuclear@26:    png_bytepp image));
nuclear@26: 
nuclear@26: /* writes the end of the PNG file. */
nuclear@26: extern PNG_EXPORT(void,png_write_end) PNGARG((png_structp png_ptr,
nuclear@26:    png_infop info_ptr));
nuclear@26: 
nuclear@26: #ifndef PNG_NO_SEQUENTIAL_READ_SUPPORTED
nuclear@26: /* read the end of the PNG file. */
nuclear@26: extern PNG_EXPORT(void,png_read_end) PNGARG((png_structp png_ptr,
nuclear@26:    png_infop info_ptr));
nuclear@26: #endif
nuclear@26: 
nuclear@26: /* free any memory associated with the png_info_struct */
nuclear@26: extern PNG_EXPORT(void,png_destroy_info_struct) PNGARG((png_structp png_ptr,
nuclear@26:    png_infopp info_ptr_ptr));
nuclear@26: 
nuclear@26: /* free any memory associated with the png_struct and the png_info_structs */
nuclear@26: extern PNG_EXPORT(void,png_destroy_read_struct) PNGARG((png_structpp
nuclear@26:    png_ptr_ptr, png_infopp info_ptr_ptr, png_infopp end_info_ptr_ptr));
nuclear@26: 
nuclear@26: /* free all memory used by the read (old method - NOT DLL EXPORTED) */
nuclear@26: extern void png_read_destroy PNGARG((png_structp png_ptr, png_infop info_ptr,
nuclear@26:    png_infop end_info_ptr));
nuclear@26: 
nuclear@26: /* free any memory associated with the png_struct and the png_info_structs */
nuclear@26: extern PNG_EXPORT(void,png_destroy_write_struct)
nuclear@26:    PNGARG((png_structpp png_ptr_ptr, png_infopp info_ptr_ptr));
nuclear@26: 
nuclear@26: /* free any memory used in png_ptr struct (old method - NOT DLL EXPORTED) */
nuclear@26: extern void png_write_destroy PNGARG((png_structp png_ptr));
nuclear@26: 
nuclear@26: /* set the libpng method of handling chunk CRC errors */
nuclear@26: extern PNG_EXPORT(void,png_set_crc_action) PNGARG((png_structp png_ptr,
nuclear@26:    int crit_action, int ancil_action));
nuclear@26: 
nuclear@26: /* Values for png_set_crc_action() to say how to handle CRC errors in
nuclear@26:  * ancillary and critical chunks, and whether to use the data contained
nuclear@26:  * therein.  Note that it is impossible to "discard" data in a critical
nuclear@26:  * chunk.  For versions prior to 0.90, the action was always error/quit,
nuclear@26:  * whereas in version 0.90 and later, the action for CRC errors in ancillary
nuclear@26:  * chunks is warn/discard.  These values should NOT be changed.
nuclear@26:  *
nuclear@26:  *      value                       action:critical     action:ancillary
nuclear@26:  */
nuclear@26: #define PNG_CRC_DEFAULT       0  /* error/quit          warn/discard data */
nuclear@26: #define PNG_CRC_ERROR_QUIT    1  /* error/quit          error/quit        */
nuclear@26: #define PNG_CRC_WARN_DISCARD  2  /* (INVALID)           warn/discard data */
nuclear@26: #define PNG_CRC_WARN_USE      3  /* warn/use data       warn/use data     */
nuclear@26: #define PNG_CRC_QUIET_USE     4  /* quiet/use data      quiet/use data    */
nuclear@26: #define PNG_CRC_NO_CHANGE     5  /* use current value   use current value */
nuclear@26: 
nuclear@26: /* These functions give the user control over the scan-line filtering in
nuclear@26:  * libpng and the compression methods used by zlib.  These functions are
nuclear@26:  * mainly useful for testing, as the defaults should work with most users.
nuclear@26:  * Those users who are tight on memory or want faster performance at the
nuclear@26:  * expense of compression can modify them.  See the compression library
nuclear@26:  * header file (zlib.h) for an explination of the compression functions.
nuclear@26:  */
nuclear@26: 
nuclear@26: /* set the filtering method(s) used by libpng.  Currently, the only valid
nuclear@26:  * value for "method" is 0.
nuclear@26:  */
nuclear@26: extern PNG_EXPORT(void,png_set_filter) PNGARG((png_structp png_ptr, int method,
nuclear@26:    int filters));
nuclear@26: 
nuclear@26: /* Flags for png_set_filter() to say which filters to use.  The flags
nuclear@26:  * are chosen so that they don't conflict with real filter types
nuclear@26:  * below, in case they are supplied instead of the #defined constants.
nuclear@26:  * These values should NOT be changed.
nuclear@26:  */
nuclear@26: #define PNG_NO_FILTERS     0x00
nuclear@26: #define PNG_FILTER_NONE    0x08
nuclear@26: #define PNG_FILTER_SUB     0x10
nuclear@26: #define PNG_FILTER_UP      0x20
nuclear@26: #define PNG_FILTER_AVG     0x40
nuclear@26: #define PNG_FILTER_PAETH   0x80
nuclear@26: #define PNG_ALL_FILTERS (PNG_FILTER_NONE | PNG_FILTER_SUB | PNG_FILTER_UP | \
nuclear@26:                          PNG_FILTER_AVG | PNG_FILTER_PAETH)
nuclear@26: 
nuclear@26: /* Filter values (not flags) - used in pngwrite.c, pngwutil.c for now.
nuclear@26:  * These defines should NOT be changed.
nuclear@26:  */
nuclear@26: #define PNG_FILTER_VALUE_NONE  0
nuclear@26: #define PNG_FILTER_VALUE_SUB   1
nuclear@26: #define PNG_FILTER_VALUE_UP    2
nuclear@26: #define PNG_FILTER_VALUE_AVG   3
nuclear@26: #define PNG_FILTER_VALUE_PAETH 4
nuclear@26: #define PNG_FILTER_VALUE_LAST  5
nuclear@26: 
nuclear@26: #if defined(PNG_WRITE_WEIGHTED_FILTER_SUPPORTED) /* EXPERIMENTAL */
nuclear@26: /* The "heuristic_method" is given by one of the PNG_FILTER_HEURISTIC_
nuclear@26:  * defines, either the default (minimum-sum-of-absolute-differences), or
nuclear@26:  * the experimental method (weighted-minimum-sum-of-absolute-differences).
nuclear@26:  *
nuclear@26:  * Weights are factors >= 1.0, indicating how important it is to keep the
nuclear@26:  * filter type consistent between rows.  Larger numbers mean the current
nuclear@26:  * filter is that many times as likely to be the same as the "num_weights"
nuclear@26:  * previous filters.  This is cumulative for each previous row with a weight.
nuclear@26:  * There needs to be "num_weights" values in "filter_weights", or it can be
nuclear@26:  * NULL if the weights aren't being specified.  Weights have no influence on
nuclear@26:  * the selection of the first row filter.  Well chosen weights can (in theory)
nuclear@26:  * improve the compression for a given image.
nuclear@26:  *
nuclear@26:  * Costs are factors >= 1.0 indicating the relative decoding costs of a
nuclear@26:  * filter type.  Higher costs indicate more decoding expense, and are
nuclear@26:  * therefore less likely to be selected over a filter with lower computational
nuclear@26:  * costs.  There needs to be a value in "filter_costs" for each valid filter
nuclear@26:  * type (given by PNG_FILTER_VALUE_LAST), or it can be NULL if you aren't
nuclear@26:  * setting the costs.  Costs try to improve the speed of decompression without
nuclear@26:  * unduly increasing the compressed image size.
nuclear@26:  *
nuclear@26:  * A negative weight or cost indicates the default value is to be used, and
nuclear@26:  * values in the range [0.0, 1.0) indicate the value is to remain unchanged.
nuclear@26:  * The default values for both weights and costs are currently 1.0, but may
nuclear@26:  * change if good general weighting/cost heuristics can be found.  If both
nuclear@26:  * the weights and costs are set to 1.0, this degenerates the WEIGHTED method
nuclear@26:  * to the UNWEIGHTED method, but with added encoding time/computation.
nuclear@26:  */
nuclear@26: #ifdef PNG_FLOATING_POINT_SUPPORTED
nuclear@26: extern PNG_EXPORT(void,png_set_filter_heuristics) PNGARG((png_structp png_ptr,
nuclear@26:    int heuristic_method, int num_weights, png_doublep filter_weights,
nuclear@26:    png_doublep filter_costs));
nuclear@26: #endif
nuclear@26: #endif /*  PNG_WRITE_WEIGHTED_FILTER_SUPPORTED */
nuclear@26: 
nuclear@26: /* Heuristic used for row filter selection.  These defines should NOT be
nuclear@26:  * changed.
nuclear@26:  */
nuclear@26: #define PNG_FILTER_HEURISTIC_DEFAULT    0  /* Currently "UNWEIGHTED" */
nuclear@26: #define PNG_FILTER_HEURISTIC_UNWEIGHTED 1  /* Used by libpng < 0.95 */
nuclear@26: #define PNG_FILTER_HEURISTIC_WEIGHTED   2  /* Experimental feature */
nuclear@26: #define PNG_FILTER_HEURISTIC_LAST       3  /* Not a valid value */
nuclear@26: 
nuclear@26: /* Set the library compression level.  Currently, valid values range from
nuclear@26:  * 0 - 9, corresponding directly to the zlib compression levels 0 - 9
nuclear@26:  * (0 - no compression, 9 - "maximal" compression).  Note that tests have
nuclear@26:  * shown that zlib compression levels 3-6 usually perform as well as level 9
nuclear@26:  * for PNG images, and do considerably fewer caclulations.  In the future,
nuclear@26:  * these values may not correspond directly to the zlib compression levels.
nuclear@26:  */
nuclear@26: extern PNG_EXPORT(void,png_set_compression_level) PNGARG((png_structp png_ptr,
nuclear@26:    int level));
nuclear@26: 
nuclear@26: extern PNG_EXPORT(void,png_set_compression_mem_level)
nuclear@26:    PNGARG((png_structp png_ptr, int mem_level));
nuclear@26: 
nuclear@26: extern PNG_EXPORT(void,png_set_compression_strategy)
nuclear@26:    PNGARG((png_structp png_ptr, int strategy));
nuclear@26: 
nuclear@26: extern PNG_EXPORT(void,png_set_compression_window_bits)
nuclear@26:    PNGARG((png_structp png_ptr, int window_bits));
nuclear@26: 
nuclear@26: extern PNG_EXPORT(void,png_set_compression_method) PNGARG((png_structp png_ptr,
nuclear@26:    int method));
nuclear@26: 
nuclear@26: /* These next functions are called for input/output, memory, and error
nuclear@26:  * handling.  They are in the file pngrio.c, pngwio.c, and pngerror.c,
nuclear@26:  * and call standard C I/O routines such as fread(), fwrite(), and
nuclear@26:  * fprintf().  These functions can be made to use other I/O routines
nuclear@26:  * at run time for those applications that need to handle I/O in a
nuclear@26:  * different manner by calling png_set_???_fn().  See libpng.txt for
nuclear@26:  * more information.
nuclear@26:  */
nuclear@26: 
nuclear@26: #if !defined(PNG_NO_STDIO)
nuclear@26: /* Initialize the input/output for the PNG file to the default functions. */
nuclear@26: extern PNG_EXPORT(void,png_init_io) PNGARG((png_structp png_ptr, png_FILE_p fp));
nuclear@26: #endif
nuclear@26: 
nuclear@26: /* Replace the (error and abort), and warning functions with user
nuclear@26:  * supplied functions.  If no messages are to be printed you must still
nuclear@26:  * write and use replacement functions. The replacement error_fn should
nuclear@26:  * still do a longjmp to the last setjmp location if you are using this
nuclear@26:  * method of error handling.  If error_fn or warning_fn is NULL, the
nuclear@26:  * default function will be used.
nuclear@26:  */
nuclear@26: 
nuclear@26: extern PNG_EXPORT(void,png_set_error_fn) PNGARG((png_structp png_ptr,
nuclear@26:    png_voidp error_ptr, png_error_ptr error_fn, png_error_ptr warning_fn));
nuclear@26: 
nuclear@26: /* Return the user pointer associated with the error functions */
nuclear@26: extern PNG_EXPORT(png_voidp,png_get_error_ptr) PNGARG((png_structp png_ptr));
nuclear@26: 
nuclear@26: /* Replace the default data output functions with a user supplied one(s).
nuclear@26:  * If buffered output is not used, then output_flush_fn can be set to NULL.
nuclear@26:  * If PNG_WRITE_FLUSH_SUPPORTED is not defined at libpng compile time
nuclear@26:  * output_flush_fn will be ignored (and thus can be NULL).
nuclear@26:  */
nuclear@26: extern PNG_EXPORT(void,png_set_write_fn) PNGARG((png_structp png_ptr,
nuclear@26:    png_voidp io_ptr, png_rw_ptr write_data_fn, png_flush_ptr output_flush_fn));
nuclear@26: 
nuclear@26: /* Replace the default data input function with a user supplied one. */
nuclear@26: extern PNG_EXPORT(void,png_set_read_fn) PNGARG((png_structp png_ptr,
nuclear@26:    png_voidp io_ptr, png_rw_ptr read_data_fn));
nuclear@26: 
nuclear@26: /* Return the user pointer associated with the I/O functions */
nuclear@26: extern PNG_EXPORT(png_voidp,png_get_io_ptr) PNGARG((png_structp png_ptr));
nuclear@26: 
nuclear@26: extern PNG_EXPORT(void,png_set_read_status_fn) PNGARG((png_structp png_ptr,
nuclear@26:    png_read_status_ptr read_row_fn));
nuclear@26: 
nuclear@26: extern PNG_EXPORT(void,png_set_write_status_fn) PNGARG((png_structp png_ptr,
nuclear@26:    png_write_status_ptr write_row_fn));
nuclear@26: 
nuclear@26: #ifdef PNG_USER_MEM_SUPPORTED
nuclear@26: /* Replace the default memory allocation functions with user supplied one(s). */
nuclear@26: extern PNG_EXPORT(void,png_set_mem_fn) PNGARG((png_structp png_ptr,
nuclear@26:    png_voidp mem_ptr, png_malloc_ptr malloc_fn, png_free_ptr free_fn));
nuclear@26: /* Return the user pointer associated with the memory functions */
nuclear@26: extern PNG_EXPORT(png_voidp,png_get_mem_ptr) PNGARG((png_structp png_ptr));
nuclear@26: #endif
nuclear@26: 
nuclear@26: #if defined(PNG_READ_USER_TRANSFORM_SUPPORTED) || \
nuclear@26:     defined(PNG_LEGACY_SUPPORTED)
nuclear@26: extern PNG_EXPORT(void,png_set_read_user_transform_fn) PNGARG((png_structp
nuclear@26:    png_ptr, png_user_transform_ptr read_user_transform_fn));
nuclear@26: #endif
nuclear@26: 
nuclear@26: #if defined(PNG_WRITE_USER_TRANSFORM_SUPPORTED) || \
nuclear@26:     defined(PNG_LEGACY_SUPPORTED)
nuclear@26: extern PNG_EXPORT(void,png_set_write_user_transform_fn) PNGARG((png_structp
nuclear@26:    png_ptr, png_user_transform_ptr write_user_transform_fn));
nuclear@26: #endif
nuclear@26: 
nuclear@26: #if defined(PNG_READ_USER_TRANSFORM_SUPPORTED) || \
nuclear@26:     defined(PNG_WRITE_USER_TRANSFORM_SUPPORTED) || \
nuclear@26:     defined(PNG_LEGACY_SUPPORTED)
nuclear@26: extern PNG_EXPORT(void,png_set_user_transform_info) PNGARG((png_structp
nuclear@26:    png_ptr, png_voidp user_transform_ptr, int user_transform_depth,
nuclear@26:    int user_transform_channels));
nuclear@26: /* Return the user pointer associated with the user transform functions */
nuclear@26: extern PNG_EXPORT(png_voidp,png_get_user_transform_ptr)
nuclear@26:    PNGARG((png_structp png_ptr));
nuclear@26: #endif
nuclear@26: 
nuclear@26: #ifdef PNG_USER_CHUNKS_SUPPORTED
nuclear@26: extern PNG_EXPORT(void,png_set_read_user_chunk_fn) PNGARG((png_structp png_ptr,
nuclear@26:    png_voidp user_chunk_ptr, png_user_chunk_ptr read_user_chunk_fn));
nuclear@26: extern PNG_EXPORT(png_voidp,png_get_user_chunk_ptr) PNGARG((png_structp
nuclear@26:    png_ptr));
nuclear@26: #endif
nuclear@26: 
nuclear@26: #ifdef PNG_PROGRESSIVE_READ_SUPPORTED
nuclear@26: /* Sets the function callbacks for the push reader, and a pointer to a
nuclear@26:  * user-defined structure available to the callback functions.
nuclear@26:  */
nuclear@26: extern PNG_EXPORT(void,png_set_progressive_read_fn) PNGARG((png_structp png_ptr,
nuclear@26:    png_voidp progressive_ptr,
nuclear@26:    png_progressive_info_ptr info_fn, png_progressive_row_ptr row_fn,
nuclear@26:    png_progressive_end_ptr end_fn));
nuclear@26: 
nuclear@26: /* returns the user pointer associated with the push read functions */
nuclear@26: extern PNG_EXPORT(png_voidp,png_get_progressive_ptr)
nuclear@26:    PNGARG((png_structp png_ptr));
nuclear@26: 
nuclear@26: /* function to be called when data becomes available */
nuclear@26: extern PNG_EXPORT(void,png_process_data) PNGARG((png_structp png_ptr,
nuclear@26:    png_infop info_ptr, png_bytep buffer, png_size_t buffer_size));
nuclear@26: 
nuclear@26: /* function that combines rows.  Not very much different than the
nuclear@26:  * png_combine_row() call.  Is this even used?????
nuclear@26:  */
nuclear@26: extern PNG_EXPORT(void,png_progressive_combine_row) PNGARG((png_structp png_ptr,
nuclear@26:    png_bytep old_row, png_bytep new_row));
nuclear@26: #endif /* PNG_PROGRESSIVE_READ_SUPPORTED */
nuclear@26: 
nuclear@26: extern PNG_EXPORT(png_voidp,png_malloc) PNGARG((png_structp png_ptr,
nuclear@26:    png_uint_32 size));
nuclear@26: 
nuclear@26: #if defined(PNG_1_0_X)
nuclear@26: #  define png_malloc_warn png_malloc
nuclear@26: #else
nuclear@26: /* Added at libpng version 1.2.4 */
nuclear@26: extern PNG_EXPORT(png_voidp,png_malloc_warn) PNGARG((png_structp png_ptr,
nuclear@26:    png_uint_32 size));
nuclear@26: #endif
nuclear@26: 
nuclear@26: /* frees a pointer allocated by png_malloc() */
nuclear@26: extern PNG_EXPORT(void,png_free) PNGARG((png_structp png_ptr, png_voidp ptr));
nuclear@26: 
nuclear@26: #if defined(PNG_1_0_X)
nuclear@26: /* Function to allocate memory for zlib. */
nuclear@26: extern PNG_EXPORT(voidpf,png_zalloc) PNGARG((voidpf png_ptr, uInt items,
nuclear@26:    uInt size));
nuclear@26: 
nuclear@26: /* Function to free memory for zlib */
nuclear@26: extern PNG_EXPORT(void,png_zfree) PNGARG((voidpf png_ptr, voidpf ptr));
nuclear@26: #endif
nuclear@26: 
nuclear@26: /* Free data that was allocated internally */
nuclear@26: extern PNG_EXPORT(void,png_free_data) PNGARG((png_structp png_ptr,
nuclear@26:    png_infop info_ptr, png_uint_32 free_me, int num));
nuclear@26: #ifdef PNG_FREE_ME_SUPPORTED
nuclear@26: /* Reassign responsibility for freeing existing data, whether allocated
nuclear@26:  * by libpng or by the application */
nuclear@26: extern PNG_EXPORT(void,png_data_freer) PNGARG((png_structp png_ptr,
nuclear@26:    png_infop info_ptr, int freer, png_uint_32 mask));
nuclear@26: #endif
nuclear@26: /* assignments for png_data_freer */
nuclear@26: #define PNG_DESTROY_WILL_FREE_DATA 1
nuclear@26: #define PNG_SET_WILL_FREE_DATA 1
nuclear@26: #define PNG_USER_WILL_FREE_DATA 2
nuclear@26: /* Flags for png_ptr->free_me and info_ptr->free_me */
nuclear@26: #define PNG_FREE_HIST 0x0008
nuclear@26: #define PNG_FREE_ICCP 0x0010
nuclear@26: #define PNG_FREE_SPLT 0x0020
nuclear@26: #define PNG_FREE_ROWS 0x0040
nuclear@26: #define PNG_FREE_PCAL 0x0080
nuclear@26: #define PNG_FREE_SCAL 0x0100
nuclear@26: #define PNG_FREE_UNKN 0x0200
nuclear@26: #define PNG_FREE_LIST 0x0400
nuclear@26: #define PNG_FREE_PLTE 0x1000
nuclear@26: #define PNG_FREE_TRNS 0x2000
nuclear@26: #define PNG_FREE_TEXT 0x4000
nuclear@26: #define PNG_FREE_ALL  0x7fff
nuclear@26: #define PNG_FREE_MUL  0x4220 /* PNG_FREE_SPLT|PNG_FREE_TEXT|PNG_FREE_UNKN */
nuclear@26: 
nuclear@26: #ifdef PNG_USER_MEM_SUPPORTED
nuclear@26: extern PNG_EXPORT(png_voidp,png_malloc_default) PNGARG((png_structp png_ptr,
nuclear@26:    png_uint_32 size));
nuclear@26: extern PNG_EXPORT(void,png_free_default) PNGARG((png_structp png_ptr,
nuclear@26:    png_voidp ptr));
nuclear@26: #endif
nuclear@26: 
nuclear@26: extern PNG_EXPORT(png_voidp,png_memcpy_check) PNGARG((png_structp png_ptr,
nuclear@26:    png_voidp s1, png_voidp s2, png_uint_32 size));
nuclear@26: 
nuclear@26: extern PNG_EXPORT(png_voidp,png_memset_check) PNGARG((png_structp png_ptr,
nuclear@26:    png_voidp s1, int value, png_uint_32 size));
nuclear@26: 
nuclear@26: #if defined(USE_FAR_KEYWORD)  /* memory model conversion function */
nuclear@26: extern void *png_far_to_near PNGARG((png_structp png_ptr,png_voidp ptr,
nuclear@26:    int check));
nuclear@26: #endif /* USE_FAR_KEYWORD */
nuclear@26: 
nuclear@26: #ifndef PNG_NO_ERROR_TEXT
nuclear@26: /* Fatal error in PNG image of libpng - can't continue */
nuclear@26: extern PNG_EXPORT(void,png_error) PNGARG((png_structp png_ptr,
nuclear@26:    png_const_charp error_message));
nuclear@26: 
nuclear@26: /* The same, but the chunk name is prepended to the error string. */
nuclear@26: extern PNG_EXPORT(void,png_chunk_error) PNGARG((png_structp png_ptr,
nuclear@26:    png_const_charp error_message));
nuclear@26: #else
nuclear@26: /* Fatal error in PNG image of libpng - can't continue */
nuclear@26: extern PNG_EXPORT(void,png_err) PNGARG((png_structp png_ptr));
nuclear@26: #endif
nuclear@26: 
nuclear@26: #ifndef PNG_NO_WARNINGS
nuclear@26: /* Non-fatal error in libpng.  Can continue, but may have a problem. */
nuclear@26: extern PNG_EXPORT(void,png_warning) PNGARG((png_structp png_ptr,
nuclear@26:    png_const_charp warning_message));
nuclear@26: 
nuclear@26: #ifdef PNG_READ_SUPPORTED
nuclear@26: /* Non-fatal error in libpng, chunk name is prepended to message. */
nuclear@26: extern PNG_EXPORT(void,png_chunk_warning) PNGARG((png_structp png_ptr,
nuclear@26:    png_const_charp warning_message));
nuclear@26: #endif /* PNG_READ_SUPPORTED */
nuclear@26: #endif /* PNG_NO_WARNINGS */
nuclear@26: 
nuclear@26: /* The png_set_<chunk> functions are for storing values in the png_info_struct.
nuclear@26:  * Similarly, the png_get_<chunk> calls are used to read values from the
nuclear@26:  * png_info_struct, either storing the parameters in the passed variables, or
nuclear@26:  * setting pointers into the png_info_struct where the data is stored.  The
nuclear@26:  * png_get_<chunk> functions return a non-zero value if the data was available
nuclear@26:  * in info_ptr, or return zero and do not change any of the parameters if the
nuclear@26:  * data was not available.
nuclear@26:  *
nuclear@26:  * These functions should be used instead of directly accessing png_info
nuclear@26:  * to avoid problems with future changes in the size and internal layout of
nuclear@26:  * png_info_struct.
nuclear@26:  */
nuclear@26: /* Returns "flag" if chunk data is valid in info_ptr. */
nuclear@26: extern PNG_EXPORT(png_uint_32,png_get_valid) PNGARG((png_structp png_ptr,
nuclear@26: png_infop info_ptr, png_uint_32 flag));
nuclear@26: 
nuclear@26: /* Returns number of bytes needed to hold a transformed row. */
nuclear@26: extern PNG_EXPORT(png_uint_32,png_get_rowbytes) PNGARG((png_structp png_ptr,
nuclear@26: png_infop info_ptr));
nuclear@26: 
nuclear@26: #if defined(PNG_INFO_IMAGE_SUPPORTED)
nuclear@26: /* Returns row_pointers, which is an array of pointers to scanlines that was
nuclear@26: returned from png_read_png(). */
nuclear@26: extern PNG_EXPORT(png_bytepp,png_get_rows) PNGARG((png_structp png_ptr,
nuclear@26: png_infop info_ptr));
nuclear@26: /* Set row_pointers, which is an array of pointers to scanlines for use
nuclear@26: by png_write_png(). */
nuclear@26: extern PNG_EXPORT(void,png_set_rows) PNGARG((png_structp png_ptr,
nuclear@26:    png_infop info_ptr, png_bytepp row_pointers));
nuclear@26: #endif
nuclear@26: 
nuclear@26: /* Returns number of color channels in image. */
nuclear@26: extern PNG_EXPORT(png_byte,png_get_channels) PNGARG((png_structp png_ptr,
nuclear@26: png_infop info_ptr));
nuclear@26: 
nuclear@26: #ifdef PNG_EASY_ACCESS_SUPPORTED
nuclear@26: /* Returns image width in pixels. */
nuclear@26: extern PNG_EXPORT(png_uint_32, png_get_image_width) PNGARG((png_structp
nuclear@26: png_ptr, png_infop info_ptr));
nuclear@26: 
nuclear@26: /* Returns image height in pixels. */
nuclear@26: extern PNG_EXPORT(png_uint_32, png_get_image_height) PNGARG((png_structp
nuclear@26: png_ptr, png_infop info_ptr));
nuclear@26: 
nuclear@26: /* Returns image bit_depth. */
nuclear@26: extern PNG_EXPORT(png_byte, png_get_bit_depth) PNGARG((png_structp
nuclear@26: png_ptr, png_infop info_ptr));
nuclear@26: 
nuclear@26: /* Returns image color_type. */
nuclear@26: extern PNG_EXPORT(png_byte, png_get_color_type) PNGARG((png_structp
nuclear@26: png_ptr, png_infop info_ptr));
nuclear@26: 
nuclear@26: /* Returns image filter_type. */
nuclear@26: extern PNG_EXPORT(png_byte, png_get_filter_type) PNGARG((png_structp
nuclear@26: png_ptr, png_infop info_ptr));
nuclear@26: 
nuclear@26: /* Returns image interlace_type. */
nuclear@26: extern PNG_EXPORT(png_byte, png_get_interlace_type) PNGARG((png_structp
nuclear@26: png_ptr, png_infop info_ptr));
nuclear@26: 
nuclear@26: /* Returns image compression_type. */
nuclear@26: extern PNG_EXPORT(png_byte, png_get_compression_type) PNGARG((png_structp
nuclear@26: png_ptr, png_infop info_ptr));
nuclear@26: 
nuclear@26: /* Returns image resolution in pixels per meter, from pHYs chunk data. */
nuclear@26: extern PNG_EXPORT(png_uint_32, png_get_pixels_per_meter) PNGARG((png_structp
nuclear@26: png_ptr, png_infop info_ptr));
nuclear@26: extern PNG_EXPORT(png_uint_32, png_get_x_pixels_per_meter) PNGARG((png_structp
nuclear@26: png_ptr, png_infop info_ptr));
nuclear@26: extern PNG_EXPORT(png_uint_32, png_get_y_pixels_per_meter) PNGARG((png_structp
nuclear@26: png_ptr, png_infop info_ptr));
nuclear@26: 
nuclear@26: /* Returns pixel aspect ratio, computed from pHYs chunk data.  */
nuclear@26: #ifdef PNG_FLOATING_POINT_SUPPORTED
nuclear@26: extern PNG_EXPORT(float, png_get_pixel_aspect_ratio) PNGARG((png_structp
nuclear@26: png_ptr, png_infop info_ptr));
nuclear@26: #endif
nuclear@26: 
nuclear@26: /* Returns image x, y offset in pixels or microns, from oFFs chunk data. */
nuclear@26: extern PNG_EXPORT(png_int_32, png_get_x_offset_pixels) PNGARG((png_structp
nuclear@26: png_ptr, png_infop info_ptr));
nuclear@26: extern PNG_EXPORT(png_int_32, png_get_y_offset_pixels) PNGARG((png_structp
nuclear@26: png_ptr, png_infop info_ptr));
nuclear@26: extern PNG_EXPORT(png_int_32, png_get_x_offset_microns) PNGARG((png_structp
nuclear@26: png_ptr, png_infop info_ptr));
nuclear@26: extern PNG_EXPORT(png_int_32, png_get_y_offset_microns) PNGARG((png_structp
nuclear@26: png_ptr, png_infop info_ptr));
nuclear@26: 
nuclear@26: #endif /* PNG_EASY_ACCESS_SUPPORTED */
nuclear@26: 
nuclear@26: /* Returns pointer to signature string read from PNG header */
nuclear@26: extern PNG_EXPORT(png_bytep,png_get_signature) PNGARG((png_structp png_ptr,
nuclear@26: png_infop info_ptr));
nuclear@26: 
nuclear@26: #if defined(PNG_bKGD_SUPPORTED)
nuclear@26: extern PNG_EXPORT(png_uint_32,png_get_bKGD) PNGARG((png_structp png_ptr,
nuclear@26:    png_infop info_ptr, png_color_16p *background));
nuclear@26: #endif
nuclear@26: 
nuclear@26: #if defined(PNG_bKGD_SUPPORTED)
nuclear@26: extern PNG_EXPORT(void,png_set_bKGD) PNGARG((png_structp png_ptr,
nuclear@26:    png_infop info_ptr, png_color_16p background));
nuclear@26: #endif
nuclear@26: 
nuclear@26: #if defined(PNG_cHRM_SUPPORTED)
nuclear@26: #ifdef PNG_FLOATING_POINT_SUPPORTED
nuclear@26: extern PNG_EXPORT(png_uint_32,png_get_cHRM) PNGARG((png_structp png_ptr,
nuclear@26:    png_infop info_ptr, double *white_x, double *white_y, double *red_x,
nuclear@26:    double *red_y, double *green_x, double *green_y, double *blue_x,
nuclear@26:    double *blue_y));
nuclear@26: #endif
nuclear@26: #ifdef PNG_FIXED_POINT_SUPPORTED
nuclear@26: extern PNG_EXPORT(png_uint_32,png_get_cHRM_fixed) PNGARG((png_structp png_ptr,
nuclear@26:    png_infop info_ptr, png_fixed_point *int_white_x, png_fixed_point
nuclear@26:    *int_white_y, png_fixed_point *int_red_x, png_fixed_point *int_red_y,
nuclear@26:    png_fixed_point *int_green_x, png_fixed_point *int_green_y, png_fixed_point
nuclear@26:    *int_blue_x, png_fixed_point *int_blue_y));
nuclear@26: #endif
nuclear@26: #endif
nuclear@26: 
nuclear@26: #if defined(PNG_cHRM_SUPPORTED)
nuclear@26: #ifdef PNG_FLOATING_POINT_SUPPORTED
nuclear@26: extern PNG_EXPORT(void,png_set_cHRM) PNGARG((png_structp png_ptr,
nuclear@26:    png_infop info_ptr, double white_x, double white_y, double red_x,
nuclear@26:    double red_y, double green_x, double green_y, double blue_x, double blue_y));
nuclear@26: #endif
nuclear@26: #ifdef PNG_FIXED_POINT_SUPPORTED
nuclear@26: extern PNG_EXPORT(void,png_set_cHRM_fixed) PNGARG((png_structp png_ptr,
nuclear@26:    png_infop info_ptr, png_fixed_point int_white_x, png_fixed_point int_white_y,
nuclear@26:    png_fixed_point int_red_x, png_fixed_point int_red_y, png_fixed_point
nuclear@26:    int_green_x, png_fixed_point int_green_y, png_fixed_point int_blue_x,
nuclear@26:    png_fixed_point int_blue_y));
nuclear@26: #endif
nuclear@26: #endif
nuclear@26: 
nuclear@26: #if defined(PNG_gAMA_SUPPORTED)
nuclear@26: #ifdef PNG_FLOATING_POINT_SUPPORTED
nuclear@26: extern PNG_EXPORT(png_uint_32,png_get_gAMA) PNGARG((png_structp png_ptr,
nuclear@26:    png_infop info_ptr, double *file_gamma));
nuclear@26: #endif
nuclear@26: extern PNG_EXPORT(png_uint_32,png_get_gAMA_fixed) PNGARG((png_structp png_ptr,
nuclear@26:    png_infop info_ptr, png_fixed_point *int_file_gamma));
nuclear@26: #endif
nuclear@26: 
nuclear@26: #if defined(PNG_gAMA_SUPPORTED)
nuclear@26: #ifdef PNG_FLOATING_POINT_SUPPORTED
nuclear@26: extern PNG_EXPORT(void,png_set_gAMA) PNGARG((png_structp png_ptr,
nuclear@26:    png_infop info_ptr, double file_gamma));
nuclear@26: #endif
nuclear@26: extern PNG_EXPORT(void,png_set_gAMA_fixed) PNGARG((png_structp png_ptr,
nuclear@26:    png_infop info_ptr, png_fixed_point int_file_gamma));
nuclear@26: #endif
nuclear@26: 
nuclear@26: #if defined(PNG_hIST_SUPPORTED)
nuclear@26: extern PNG_EXPORT(png_uint_32,png_get_hIST) PNGARG((png_structp png_ptr,
nuclear@26:    png_infop info_ptr, png_uint_16p *hist));
nuclear@26: #endif
nuclear@26: 
nuclear@26: #if defined(PNG_hIST_SUPPORTED)
nuclear@26: extern PNG_EXPORT(void,png_set_hIST) PNGARG((png_structp png_ptr,
nuclear@26:    png_infop info_ptr, png_uint_16p hist));
nuclear@26: #endif
nuclear@26: 
nuclear@26: extern PNG_EXPORT(png_uint_32,png_get_IHDR) PNGARG((png_structp png_ptr,
nuclear@26:    png_infop info_ptr, png_uint_32 *width, png_uint_32 *height,
nuclear@26:    int *bit_depth, int *color_type, int *interlace_method,
nuclear@26:    int *compression_method, int *filter_method));
nuclear@26: 
nuclear@26: extern PNG_EXPORT(void,png_set_IHDR) PNGARG((png_structp png_ptr,
nuclear@26:    png_infop info_ptr, png_uint_32 width, png_uint_32 height, int bit_depth,
nuclear@26:    int color_type, int interlace_method, int compression_method,
nuclear@26:    int filter_method));
nuclear@26: 
nuclear@26: #if defined(PNG_oFFs_SUPPORTED)
nuclear@26: extern PNG_EXPORT(png_uint_32,png_get_oFFs) PNGARG((png_structp png_ptr,
nuclear@26:    png_infop info_ptr, png_int_32 *offset_x, png_int_32 *offset_y,
nuclear@26:    int *unit_type));
nuclear@26: #endif
nuclear@26: 
nuclear@26: #if defined(PNG_oFFs_SUPPORTED)
nuclear@26: extern PNG_EXPORT(void,png_set_oFFs) PNGARG((png_structp png_ptr,
nuclear@26:    png_infop info_ptr, png_int_32 offset_x, png_int_32 offset_y,
nuclear@26:    int unit_type));
nuclear@26: #endif
nuclear@26: 
nuclear@26: #if defined(PNG_pCAL_SUPPORTED)
nuclear@26: extern PNG_EXPORT(png_uint_32,png_get_pCAL) PNGARG((png_structp png_ptr,
nuclear@26:    png_infop info_ptr, png_charp *purpose, png_int_32 *X0, png_int_32 *X1,
nuclear@26:    int *type, int *nparams, png_charp *units, png_charpp *params));
nuclear@26: #endif
nuclear@26: 
nuclear@26: #if defined(PNG_pCAL_SUPPORTED)
nuclear@26: extern PNG_EXPORT(void,png_set_pCAL) PNGARG((png_structp png_ptr,
nuclear@26:    png_infop info_ptr, png_charp purpose, png_int_32 X0, png_int_32 X1,
nuclear@26:    int type, int nparams, png_charp units, png_charpp params));
nuclear@26: #endif
nuclear@26: 
nuclear@26: #if defined(PNG_pHYs_SUPPORTED)
nuclear@26: extern PNG_EXPORT(png_uint_32,png_get_pHYs) PNGARG((png_structp png_ptr,
nuclear@26:    png_infop info_ptr, png_uint_32 *res_x, png_uint_32 *res_y, int *unit_type));
nuclear@26: #endif
nuclear@26: 
nuclear@26: #if defined(PNG_pHYs_SUPPORTED)
nuclear@26: extern PNG_EXPORT(void,png_set_pHYs) PNGARG((png_structp png_ptr,
nuclear@26:    png_infop info_ptr, png_uint_32 res_x, png_uint_32 res_y, int unit_type));
nuclear@26: #endif
nuclear@26: 
nuclear@26: extern PNG_EXPORT(png_uint_32,png_get_PLTE) PNGARG((png_structp png_ptr,
nuclear@26:    png_infop info_ptr, png_colorp *palette, int *num_palette));
nuclear@26: 
nuclear@26: extern PNG_EXPORT(void,png_set_PLTE) PNGARG((png_structp png_ptr,
nuclear@26:    png_infop info_ptr, png_colorp palette, int num_palette));
nuclear@26: 
nuclear@26: #if defined(PNG_sBIT_SUPPORTED)
nuclear@26: extern PNG_EXPORT(png_uint_32,png_get_sBIT) PNGARG((png_structp png_ptr,
nuclear@26:    png_infop info_ptr, png_color_8p *sig_bit));
nuclear@26: #endif
nuclear@26: 
nuclear@26: #if defined(PNG_sBIT_SUPPORTED)
nuclear@26: extern PNG_EXPORT(void,png_set_sBIT) PNGARG((png_structp png_ptr,
nuclear@26:    png_infop info_ptr, png_color_8p sig_bit));
nuclear@26: #endif
nuclear@26: 
nuclear@26: #if defined(PNG_sRGB_SUPPORTED)
nuclear@26: extern PNG_EXPORT(png_uint_32,png_get_sRGB) PNGARG((png_structp png_ptr,
nuclear@26:    png_infop info_ptr, int *intent));
nuclear@26: #endif
nuclear@26: 
nuclear@26: #if defined(PNG_sRGB_SUPPORTED)
nuclear@26: extern PNG_EXPORT(void,png_set_sRGB) PNGARG((png_structp png_ptr,
nuclear@26:    png_infop info_ptr, int intent));
nuclear@26: extern PNG_EXPORT(void,png_set_sRGB_gAMA_and_cHRM) PNGARG((png_structp png_ptr,
nuclear@26:    png_infop info_ptr, int intent));
nuclear@26: #endif
nuclear@26: 
nuclear@26: #if defined(PNG_iCCP_SUPPORTED)
nuclear@26: extern PNG_EXPORT(png_uint_32,png_get_iCCP) PNGARG((png_structp png_ptr,
nuclear@26:    png_infop info_ptr, png_charpp name, int *compression_type,
nuclear@26:    png_charpp profile, png_uint_32 *proflen));
nuclear@26:    /* Note to maintainer: profile should be png_bytepp */
nuclear@26: #endif
nuclear@26: 
nuclear@26: #if defined(PNG_iCCP_SUPPORTED)
nuclear@26: extern PNG_EXPORT(void,png_set_iCCP) PNGARG((png_structp png_ptr,
nuclear@26:    png_infop info_ptr, png_charp name, int compression_type,
nuclear@26:    png_charp profile, png_uint_32 proflen));
nuclear@26:    /* Note to maintainer: profile should be png_bytep */
nuclear@26: #endif
nuclear@26: 
nuclear@26: #if defined(PNG_sPLT_SUPPORTED)
nuclear@26: extern PNG_EXPORT(png_uint_32,png_get_sPLT) PNGARG((png_structp png_ptr,
nuclear@26:    png_infop info_ptr, png_sPLT_tpp entries));
nuclear@26: #endif
nuclear@26: 
nuclear@26: #if defined(PNG_sPLT_SUPPORTED)
nuclear@26: extern PNG_EXPORT(void,png_set_sPLT) PNGARG((png_structp png_ptr,
nuclear@26:    png_infop info_ptr, png_sPLT_tp entries, int nentries));
nuclear@26: #endif
nuclear@26: 
nuclear@26: #if defined(PNG_TEXT_SUPPORTED)
nuclear@26: /* png_get_text also returns the number of text chunks in *num_text */
nuclear@26: extern PNG_EXPORT(png_uint_32,png_get_text) PNGARG((png_structp png_ptr,
nuclear@26:    png_infop info_ptr, png_textp *text_ptr, int *num_text));
nuclear@26: #endif
nuclear@26: 
nuclear@26: /*
nuclear@26:  *  Note while png_set_text() will accept a structure whose text,
nuclear@26:  *  language, and  translated keywords are NULL pointers, the structure
nuclear@26:  *  returned by png_get_text will always contain regular
nuclear@26:  *  zero-terminated C strings.  They might be empty strings but
nuclear@26:  *  they will never be NULL pointers.
nuclear@26:  */
nuclear@26: 
nuclear@26: #if defined(PNG_TEXT_SUPPORTED)
nuclear@26: extern PNG_EXPORT(void,png_set_text) PNGARG((png_structp png_ptr,
nuclear@26:    png_infop info_ptr, png_textp text_ptr, int num_text));
nuclear@26: #endif
nuclear@26: 
nuclear@26: #if defined(PNG_tIME_SUPPORTED)
nuclear@26: extern PNG_EXPORT(png_uint_32,png_get_tIME) PNGARG((png_structp png_ptr,
nuclear@26:    png_infop info_ptr, png_timep *mod_time));
nuclear@26: #endif
nuclear@26: 
nuclear@26: #if defined(PNG_tIME_SUPPORTED)
nuclear@26: extern PNG_EXPORT(void,png_set_tIME) PNGARG((png_structp png_ptr,
nuclear@26:    png_infop info_ptr, png_timep mod_time));
nuclear@26: #endif
nuclear@26: 
nuclear@26: #if defined(PNG_tRNS_SUPPORTED)
nuclear@26: extern PNG_EXPORT(png_uint_32,png_get_tRNS) PNGARG((png_structp png_ptr,
nuclear@26:    png_infop info_ptr, png_bytep *trans, int *num_trans,
nuclear@26:    png_color_16p *trans_values));
nuclear@26: #endif
nuclear@26: 
nuclear@26: #if defined(PNG_tRNS_SUPPORTED)
nuclear@26: extern PNG_EXPORT(void,png_set_tRNS) PNGARG((png_structp png_ptr,
nuclear@26:    png_infop info_ptr, png_bytep trans, int num_trans,
nuclear@26:    png_color_16p trans_values));
nuclear@26: #endif
nuclear@26: 
nuclear@26: #if defined(PNG_tRNS_SUPPORTED)
nuclear@26: #endif
nuclear@26: 
nuclear@26: #if defined(PNG_sCAL_SUPPORTED)
nuclear@26: #ifdef PNG_FLOATING_POINT_SUPPORTED
nuclear@26: extern PNG_EXPORT(png_uint_32,png_get_sCAL) PNGARG((png_structp png_ptr,
nuclear@26:    png_infop info_ptr, int *unit, double *width, double *height));
nuclear@26: #else
nuclear@26: #ifdef PNG_FIXED_POINT_SUPPORTED
nuclear@26: extern PNG_EXPORT(png_uint_32,png_get_sCAL_s) PNGARG((png_structp png_ptr,
nuclear@26:    png_infop info_ptr, int *unit, png_charpp swidth, png_charpp sheight));
nuclear@26: #endif
nuclear@26: #endif
nuclear@26: #endif /* PNG_sCAL_SUPPORTED */
nuclear@26: 
nuclear@26: #if defined(PNG_sCAL_SUPPORTED)
nuclear@26: #ifdef PNG_FLOATING_POINT_SUPPORTED
nuclear@26: extern PNG_EXPORT(void,png_set_sCAL) PNGARG((png_structp png_ptr,
nuclear@26:    png_infop info_ptr, int unit, double width, double height));
nuclear@26: #else
nuclear@26: #ifdef PNG_FIXED_POINT_SUPPORTED
nuclear@26: extern PNG_EXPORT(void,png_set_sCAL_s) PNGARG((png_structp png_ptr,
nuclear@26:    png_infop info_ptr, int unit, png_charp swidth, png_charp sheight));
nuclear@26: #endif
nuclear@26: #endif
nuclear@26: #endif /* PNG_sCAL_SUPPORTED || PNG_WRITE_sCAL_SUPPORTED */
nuclear@26: 
nuclear@26: #if defined(PNG_UNKNOWN_CHUNKS_SUPPORTED)
nuclear@26: /* provide a list of chunks and how they are to be handled, if the built-in
nuclear@26:    handling or default unknown chunk handling is not desired.  Any chunks not
nuclear@26:    listed will be handled in the default manner.  The IHDR and IEND chunks
nuclear@26:    must not be listed.
nuclear@26:       keep = 0: follow default behaviour
nuclear@26:            = 1: do not keep
nuclear@26:            = 2: keep only if safe-to-copy
nuclear@26:            = 3: keep even if unsafe-to-copy
nuclear@26: */
nuclear@26: extern PNG_EXPORT(void, png_set_keep_unknown_chunks) PNGARG((png_structp
nuclear@26:    png_ptr, int keep, png_bytep chunk_list, int num_chunks));
nuclear@26: extern PNG_EXPORT(void, png_set_unknown_chunks) PNGARG((png_structp png_ptr,
nuclear@26:    png_infop info_ptr, png_unknown_chunkp unknowns, int num_unknowns));
nuclear@26: extern PNG_EXPORT(void, png_set_unknown_chunk_location)
nuclear@26:    PNGARG((png_structp png_ptr, png_infop info_ptr, int chunk, int location));
nuclear@26: extern PNG_EXPORT(png_uint_32,png_get_unknown_chunks) PNGARG((png_structp
nuclear@26:    png_ptr, png_infop info_ptr, png_unknown_chunkpp entries));
nuclear@26: #endif
nuclear@26: #ifdef PNG_HANDLE_AS_UNKNOWN_SUPPORTED
nuclear@26: PNG_EXPORT(int,png_handle_as_unknown) PNGARG((png_structp png_ptr, png_bytep
nuclear@26:    chunk_name));
nuclear@26: #endif
nuclear@26: 
nuclear@26: /* Png_free_data() will turn off the "valid" flag for anything it frees.
nuclear@26:    If you need to turn it off for a chunk that your application has freed,
nuclear@26:    you can use png_set_invalid(png_ptr, info_ptr, PNG_INFO_CHNK); */
nuclear@26: extern PNG_EXPORT(void, png_set_invalid) PNGARG((png_structp png_ptr,
nuclear@26:    png_infop info_ptr, int mask));
nuclear@26: 
nuclear@26: #if defined(PNG_INFO_IMAGE_SUPPORTED)
nuclear@26: /* The "params" pointer is currently not used and is for future expansion. */
nuclear@26: extern PNG_EXPORT(void, png_read_png) PNGARG((png_structp png_ptr,
nuclear@26:                         png_infop info_ptr,
nuclear@26:                         int transforms,
nuclear@26:                         png_voidp params));
nuclear@26: extern PNG_EXPORT(void, png_write_png) PNGARG((png_structp png_ptr,
nuclear@26:                         png_infop info_ptr,
nuclear@26:                         int transforms,
nuclear@26:                         png_voidp params));
nuclear@26: #endif
nuclear@26: 
nuclear@26: /* Define PNG_DEBUG at compile time for debugging information.  Higher
nuclear@26:  * numbers for PNG_DEBUG mean more debugging information.  This has
nuclear@26:  * only been added since version 0.95 so it is not implemented throughout
nuclear@26:  * libpng yet, but more support will be added as needed.
nuclear@26:  */
nuclear@26: #ifdef PNG_DEBUG
nuclear@26: #if (PNG_DEBUG > 0)
nuclear@26: #if !defined(PNG_DEBUG_FILE) && defined(_MSC_VER)
nuclear@26: #include <crtdbg.h>
nuclear@26: #if (PNG_DEBUG > 1)
nuclear@26: #define png_debug(l,m)  _RPT0(_CRT_WARN,m)
nuclear@26: #define png_debug1(l,m,p1)  _RPT1(_CRT_WARN,m,p1)
nuclear@26: #define png_debug2(l,m,p1,p2) _RPT2(_CRT_WARN,m,p1,p2)
nuclear@26: #endif
nuclear@26: #else /* PNG_DEBUG_FILE || !_MSC_VER */
nuclear@26: #ifndef PNG_DEBUG_FILE
nuclear@26: #define PNG_DEBUG_FILE stderr
nuclear@26: #endif /* PNG_DEBUG_FILE */
nuclear@26: #if (PNG_DEBUG > 1)
nuclear@26: #define png_debug(l,m) \
nuclear@26: { \
nuclear@26:      int num_tabs=l; \
nuclear@26:      fprintf(PNG_DEBUG_FILE,"%s"m,(num_tabs==1 ? "\t" : \
nuclear@26:        (num_tabs==2 ? "\t\t":(num_tabs>2 ? "\t\t\t":"")))); \
nuclear@26: }
nuclear@26: #define png_debug1(l,m,p1) \
nuclear@26: { \
nuclear@26:      int num_tabs=l; \
nuclear@26:      fprintf(PNG_DEBUG_FILE,"%s"m,(num_tabs==1 ? "\t" : \
nuclear@26:        (num_tabs==2 ? "\t\t":(num_tabs>2 ? "\t\t\t":""))),p1); \
nuclear@26: }
nuclear@26: #define png_debug2(l,m,p1,p2) \
nuclear@26: { \
nuclear@26:      int num_tabs=l; \
nuclear@26:      fprintf(PNG_DEBUG_FILE,"%s"m,(num_tabs==1 ? "\t" : \
nuclear@26:        (num_tabs==2 ? "\t\t":(num_tabs>2 ? "\t\t\t":""))),p1,p2); \
nuclear@26: }
nuclear@26: #endif /* (PNG_DEBUG > 1) */
nuclear@26: #endif /* _MSC_VER */
nuclear@26: #endif /* (PNG_DEBUG > 0) */
nuclear@26: #endif /* PNG_DEBUG */
nuclear@26: #ifndef png_debug
nuclear@26: #define png_debug(l, m)
nuclear@26: #endif
nuclear@26: #ifndef png_debug1
nuclear@26: #define png_debug1(l, m, p1)
nuclear@26: #endif
nuclear@26: #ifndef png_debug2
nuclear@26: #define png_debug2(l, m, p1, p2)
nuclear@26: #endif
nuclear@26: 
nuclear@26: extern PNG_EXPORT(png_charp,png_get_copyright) PNGARG((png_structp png_ptr));
nuclear@26: extern PNG_EXPORT(png_charp,png_get_header_ver) PNGARG((png_structp png_ptr));
nuclear@26: extern PNG_EXPORT(png_charp,png_get_header_version) PNGARG((png_structp png_ptr));
nuclear@26: extern PNG_EXPORT(png_charp,png_get_libpng_ver) PNGARG((png_structp png_ptr));
nuclear@26: 
nuclear@26: #ifdef PNG_MNG_FEATURES_SUPPORTED
nuclear@26: extern PNG_EXPORT(png_uint_32,png_permit_mng_features) PNGARG((png_structp
nuclear@26:    png_ptr, png_uint_32 mng_features_permitted));
nuclear@26: #endif
nuclear@26: 
nuclear@26: /* For use in png_set_keep_unknown, added to version 1.2.6 */
nuclear@26: #define PNG_HANDLE_CHUNK_AS_DEFAULT   0
nuclear@26: #define PNG_HANDLE_CHUNK_NEVER        1
nuclear@26: #define PNG_HANDLE_CHUNK_IF_SAFE      2
nuclear@26: #define PNG_HANDLE_CHUNK_ALWAYS       3
nuclear@26: 
nuclear@26: /* Added to version 1.2.0 */
nuclear@26: #if defined(PNG_ASSEMBLER_CODE_SUPPORTED)
nuclear@26: #if defined(PNG_MMX_CODE_SUPPORTED)
nuclear@26: #define PNG_ASM_FLAG_MMX_SUPPORT_COMPILED  0x01  /* not user-settable */
nuclear@26: #define PNG_ASM_FLAG_MMX_SUPPORT_IN_CPU    0x02  /* not user-settable */
nuclear@26: #define PNG_ASM_FLAG_MMX_READ_COMBINE_ROW  0x04
nuclear@26: #define PNG_ASM_FLAG_MMX_READ_INTERLACE    0x08
nuclear@26: #define PNG_ASM_FLAG_MMX_READ_FILTER_SUB   0x10
nuclear@26: #define PNG_ASM_FLAG_MMX_READ_FILTER_UP    0x20
nuclear@26: #define PNG_ASM_FLAG_MMX_READ_FILTER_AVG   0x40
nuclear@26: #define PNG_ASM_FLAG_MMX_READ_FILTER_PAETH 0x80
nuclear@26: #define PNG_ASM_FLAGS_INITIALIZED          0x80000000  /* not user-settable */
nuclear@26: 
nuclear@26: #define PNG_MMX_READ_FLAGS ( PNG_ASM_FLAG_MMX_READ_COMBINE_ROW  \
nuclear@26:                            | PNG_ASM_FLAG_MMX_READ_INTERLACE    \
nuclear@26:                            | PNG_ASM_FLAG_MMX_READ_FILTER_SUB   \
nuclear@26:                            | PNG_ASM_FLAG_MMX_READ_FILTER_UP    \
nuclear@26:                            | PNG_ASM_FLAG_MMX_READ_FILTER_AVG   \
nuclear@26:                            | PNG_ASM_FLAG_MMX_READ_FILTER_PAETH )
nuclear@26: #define PNG_MMX_WRITE_FLAGS ( 0 )
nuclear@26: 
nuclear@26: #define PNG_MMX_FLAGS ( PNG_ASM_FLAG_MMX_SUPPORT_COMPILED \
nuclear@26:                       | PNG_ASM_FLAG_MMX_SUPPORT_IN_CPU   \
nuclear@26:                       | PNG_MMX_READ_FLAGS                \
nuclear@26:                       | PNG_MMX_WRITE_FLAGS )
nuclear@26: 
nuclear@26: #define PNG_SELECT_READ   1
nuclear@26: #define PNG_SELECT_WRITE  2
nuclear@26: #endif /* PNG_MMX_CODE_SUPPORTED */
nuclear@26: 
nuclear@26: #if !defined(PNG_1_0_X)
nuclear@26: /* pngget.c */
nuclear@26: extern PNG_EXPORT(png_uint_32,png_get_mmx_flagmask)
nuclear@26:    PNGARG((int flag_select, int *compilerID));
nuclear@26: 
nuclear@26: /* pngget.c */
nuclear@26: extern PNG_EXPORT(png_uint_32,png_get_asm_flagmask)
nuclear@26:    PNGARG((int flag_select));
nuclear@26: 
nuclear@26: /* pngget.c */
nuclear@26: extern PNG_EXPORT(png_uint_32,png_get_asm_flags)
nuclear@26:    PNGARG((png_structp png_ptr));
nuclear@26: 
nuclear@26: /* pngget.c */
nuclear@26: extern PNG_EXPORT(png_byte,png_get_mmx_bitdepth_threshold)
nuclear@26:    PNGARG((png_structp png_ptr));
nuclear@26: 
nuclear@26: /* pngget.c */
nuclear@26: extern PNG_EXPORT(png_uint_32,png_get_mmx_rowbytes_threshold)
nuclear@26:    PNGARG((png_structp png_ptr));
nuclear@26: 
nuclear@26: /* pngset.c */
nuclear@26: extern PNG_EXPORT(void,png_set_asm_flags)
nuclear@26:    PNGARG((png_structp png_ptr, png_uint_32 asm_flags));
nuclear@26: 
nuclear@26: /* pngset.c */
nuclear@26: extern PNG_EXPORT(void,png_set_mmx_thresholds)
nuclear@26:    PNGARG((png_structp png_ptr, png_byte mmx_bitdepth_threshold,
nuclear@26:    png_uint_32 mmx_rowbytes_threshold));
nuclear@26: 
nuclear@26: #endif /* PNG_1_0_X */
nuclear@26: 
nuclear@26: #if !defined(PNG_1_0_X)
nuclear@26: /* png.c, pnggccrd.c, or pngvcrd.c */
nuclear@26: extern PNG_EXPORT(int,png_mmx_support) PNGARG((void));
nuclear@26: #endif /* PNG_ASSEMBLER_CODE_SUPPORTED */
nuclear@26: 
nuclear@26: /* Strip the prepended error numbers ("#nnn ") from error and warning
nuclear@26:  * messages before passing them to the error or warning handler. */
nuclear@26: #ifdef PNG_ERROR_NUMBERS_SUPPORTED
nuclear@26: extern PNG_EXPORT(void,png_set_strip_error_numbers) PNGARG((png_structp
nuclear@26:    png_ptr, png_uint_32 strip_mode));
nuclear@26: #endif
nuclear@26: 
nuclear@26: #endif /* PNG_1_0_X */
nuclear@26: 
nuclear@26: /* Added at libpng-1.2.6 */
nuclear@26: #ifdef PNG_SET_USER_LIMITS_SUPPORTED
nuclear@26: extern PNG_EXPORT(void,png_set_user_limits) PNGARG((png_structp
nuclear@26:    png_ptr, png_uint_32 user_width_max, png_uint_32 user_height_max));
nuclear@26: extern PNG_EXPORT(png_uint_32,png_get_user_width_max) PNGARG((png_structp
nuclear@26:    png_ptr));
nuclear@26: extern PNG_EXPORT(png_uint_32,png_get_user_height_max) PNGARG((png_structp
nuclear@26:    png_ptr));
nuclear@26: #endif
nuclear@26: 
nuclear@26: 
nuclear@26: /* Maintainer: Put new public prototypes here ^, in libpng.3, and project defs */
nuclear@26: 
nuclear@26: #ifdef PNG_READ_COMPOSITE_NODIV_SUPPORTED
nuclear@26: /* With these routines we avoid an integer divide, which will be slower on
nuclear@26:  * most machines.  However, it does take more operations than the corresponding
nuclear@26:  * divide method, so it may be slower on a few RISC systems.  There are two
nuclear@26:  * shifts (by 8 or 16 bits) and an addition, versus a single integer divide.
nuclear@26:  *
nuclear@26:  * Note that the rounding factors are NOT supposed to be the same!  128 and
nuclear@26:  * 32768 are correct for the NODIV code; 127 and 32767 are correct for the
nuclear@26:  * standard method.
nuclear@26:  *
nuclear@26:  * [Optimized code by Greg Roelofs and Mark Adler...blame us for bugs. :-) ]
nuclear@26:  */
nuclear@26: 
nuclear@26:  /* fg and bg should be in `gamma 1.0' space; alpha is the opacity          */
nuclear@26: 
nuclear@26: #  define png_composite(composite, fg, alpha, bg)                            \
nuclear@26:      { png_uint_16 temp = (png_uint_16)((png_uint_16)(fg) * (png_uint_16)(alpha) \
nuclear@26:                         +        (png_uint_16)(bg)*(png_uint_16)(255 -       \
nuclear@26:                         (png_uint_16)(alpha)) + (png_uint_16)128);           \
nuclear@26:        (composite) = (png_byte)((temp + (temp >> 8)) >> 8); }
nuclear@26: 
nuclear@26: #  define png_composite_16(composite, fg, alpha, bg)                         \
nuclear@26:      { png_uint_32 temp = (png_uint_32)((png_uint_32)(fg) * (png_uint_32)(alpha) \
nuclear@26:                         + (png_uint_32)(bg)*(png_uint_32)(65535L -           \
nuclear@26:                         (png_uint_32)(alpha)) + (png_uint_32)32768L);        \
nuclear@26:        (composite) = (png_uint_16)((temp + (temp >> 16)) >> 16); }
nuclear@26: 
nuclear@26: #else  /* standard method using integer division */
nuclear@26: 
nuclear@26: #  define png_composite(composite, fg, alpha, bg)                            \
nuclear@26:      (composite) = (png_byte)(((png_uint_16)(fg) * (png_uint_16)(alpha) +    \
nuclear@26:        (png_uint_16)(bg) * (png_uint_16)(255 - (png_uint_16)(alpha)) +       \
nuclear@26:        (png_uint_16)127) / 255)
nuclear@26: 
nuclear@26: #  define png_composite_16(composite, fg, alpha, bg)                         \
nuclear@26:      (composite) = (png_uint_16)(((png_uint_32)(fg) * (png_uint_32)(alpha) + \
nuclear@26:        (png_uint_32)(bg)*(png_uint_32)(65535L - (png_uint_32)(alpha)) +      \
nuclear@26:        (png_uint_32)32767) / (png_uint_32)65535L)
nuclear@26: 
nuclear@26: #endif /* PNG_READ_COMPOSITE_NODIV_SUPPORTED */
nuclear@26: 
nuclear@26: /* Inline macros to do direct reads of bytes from the input buffer.  These
nuclear@26:  * require that you are using an architecture that uses PNG byte ordering
nuclear@26:  * (MSB first) and supports unaligned data storage.  I think that PowerPC
nuclear@26:  * in big-endian mode and 680x0 are the only ones that will support this.
nuclear@26:  * The x86 line of processors definitely do not.  The png_get_int_32()
nuclear@26:  * routine also assumes we are using two's complement format for negative
nuclear@26:  * values, which is almost certainly true.
nuclear@26:  */
nuclear@26: #if defined(PNG_READ_BIG_ENDIAN_SUPPORTED)
nuclear@26: #  define png_get_uint_32(buf) ( *((png_uint_32p) (buf)))
nuclear@26: #  define png_get_uint_16(buf) ( *((png_uint_16p) (buf)))
nuclear@26: #  define png_get_int_32(buf)  ( *((png_int_32p)  (buf)))
nuclear@26: #else
nuclear@26: extern PNG_EXPORT(png_uint_32,png_get_uint_32) PNGARG((png_bytep buf));
nuclear@26: extern PNG_EXPORT(png_uint_16,png_get_uint_16) PNGARG((png_bytep buf));
nuclear@26: extern PNG_EXPORT(png_int_32,png_get_int_32) PNGARG((png_bytep buf));
nuclear@26: #endif /* !PNG_READ_BIG_ENDIAN_SUPPORTED */
nuclear@26: extern PNG_EXPORT(png_uint_32,png_get_uint_31)
nuclear@26:   PNGARG((png_structp png_ptr, png_bytep buf));
nuclear@26: /* No png_get_int_16 -- may be added if there's a real need for it. */
nuclear@26: 
nuclear@26: /* Place a 32-bit number into a buffer in PNG byte order (big-endian).
nuclear@26:  */
nuclear@26: extern PNG_EXPORT(void,png_save_uint_32)
nuclear@26:    PNGARG((png_bytep buf, png_uint_32 i));
nuclear@26: extern PNG_EXPORT(void,png_save_int_32)
nuclear@26:    PNGARG((png_bytep buf, png_int_32 i));
nuclear@26: 
nuclear@26: /* Place a 16-bit number into a buffer in PNG byte order.
nuclear@26:  * The parameter is declared unsigned int, not png_uint_16,
nuclear@26:  * just to avoid potential problems on pre-ANSI C compilers.
nuclear@26:  */
nuclear@26: extern PNG_EXPORT(void,png_save_uint_16)
nuclear@26:    PNGARG((png_bytep buf, unsigned int i));
nuclear@26: /* No png_save_int_16 -- may be added if there's a real need for it. */
nuclear@26: 
nuclear@26: /* ************************************************************************* */
nuclear@26: 
nuclear@26: /* These next functions are used internally in the code.  They generally
nuclear@26:  * shouldn't be used unless you are writing code to add or replace some
nuclear@26:  * functionality in libpng.  More information about most functions can
nuclear@26:  * be found in the files where the functions are located.
nuclear@26:  */
nuclear@26: 
nuclear@26: 
nuclear@26: /* Various modes of operation, that are visible to applications because
nuclear@26:  * they are used for unknown chunk location.
nuclear@26:  */
nuclear@26: #define PNG_HAVE_IHDR               0x01
nuclear@26: #define PNG_HAVE_PLTE               0x02
nuclear@26: #define PNG_HAVE_IDAT               0x04
nuclear@26: #define PNG_AFTER_IDAT              0x08 /* Have complete zlib datastream */
nuclear@26: #define PNG_HAVE_IEND               0x10
nuclear@26: 
nuclear@26: #if defined(PNG_INTERNAL)
nuclear@26: 
nuclear@26: /* More modes of operation.  Note that after an init, mode is set to
nuclear@26:  * zero automatically when the structure is created.
nuclear@26:  */
nuclear@26: #define PNG_HAVE_gAMA               0x20
nuclear@26: #define PNG_HAVE_cHRM               0x40
nuclear@26: #define PNG_HAVE_sRGB               0x80
nuclear@26: #define PNG_HAVE_CHUNK_HEADER      0x100
nuclear@26: #define PNG_WROTE_tIME             0x200
nuclear@26: #define PNG_WROTE_INFO_BEFORE_PLTE 0x400
nuclear@26: #define PNG_BACKGROUND_IS_GRAY     0x800
nuclear@26: #define PNG_HAVE_PNG_SIGNATURE    0x1000
nuclear@26: #define PNG_HAVE_CHUNK_AFTER_IDAT 0x2000 /* Have another chunk after IDAT */
nuclear@26: 
nuclear@26: /* flags for the transformations the PNG library does on the image data */
nuclear@26: #define PNG_BGR                0x0001
nuclear@26: #define PNG_INTERLACE          0x0002
nuclear@26: #define PNG_PACK               0x0004
nuclear@26: #define PNG_SHIFT              0x0008
nuclear@26: #define PNG_SWAP_BYTES         0x0010
nuclear@26: #define PNG_INVERT_MONO        0x0020
nuclear@26: #define PNG_DITHER             0x0040
nuclear@26: #define PNG_BACKGROUND         0x0080
nuclear@26: #define PNG_BACKGROUND_EXPAND  0x0100
nuclear@26:                           /*   0x0200 unused */
nuclear@26: #define PNG_16_TO_8            0x0400
nuclear@26: #define PNG_RGBA               0x0800
nuclear@26: #define PNG_EXPAND             0x1000
nuclear@26: #define PNG_GAMMA              0x2000
nuclear@26: #define PNG_GRAY_TO_RGB        0x4000
nuclear@26: #define PNG_FILLER             0x8000L
nuclear@26: #define PNG_PACKSWAP          0x10000L
nuclear@26: #define PNG_SWAP_ALPHA        0x20000L
nuclear@26: #define PNG_STRIP_ALPHA       0x40000L
nuclear@26: #define PNG_INVERT_ALPHA      0x80000L
nuclear@26: #define PNG_USER_TRANSFORM   0x100000L
nuclear@26: #define PNG_RGB_TO_GRAY_ERR  0x200000L
nuclear@26: #define PNG_RGB_TO_GRAY_WARN 0x400000L
nuclear@26: #define PNG_RGB_TO_GRAY      0x600000L  /* two bits, RGB_TO_GRAY_ERR|WARN */
nuclear@26:                        /*    0x800000L     Unused */
nuclear@26: #define PNG_ADD_ALPHA       0x1000000L  /* Added to libpng-1.2.7 */
nuclear@26: #define PNG_EXPAND_tRNS     0x2000000L  /* Added to libpng-1.2.9 */
nuclear@26:                        /*   0x4000000L  unused */
nuclear@26:                        /*   0x8000000L  unused */
nuclear@26:                        /*  0x10000000L  unused */
nuclear@26:                        /*  0x20000000L  unused */
nuclear@26:                        /*  0x40000000L  unused */
nuclear@26: 
nuclear@26: /* flags for png_create_struct */
nuclear@26: #define PNG_STRUCT_PNG   0x0001
nuclear@26: #define PNG_STRUCT_INFO  0x0002
nuclear@26: 
nuclear@26: /* Scaling factor for filter heuristic weighting calculations */
nuclear@26: #define PNG_WEIGHT_SHIFT 8
nuclear@26: #define PNG_WEIGHT_FACTOR (1<<(PNG_WEIGHT_SHIFT))
nuclear@26: #define PNG_COST_SHIFT 3
nuclear@26: #define PNG_COST_FACTOR (1<<(PNG_COST_SHIFT))
nuclear@26: 
nuclear@26: /* flags for the png_ptr->flags rather than declaring a byte for each one */
nuclear@26: #define PNG_FLAG_ZLIB_CUSTOM_STRATEGY     0x0001
nuclear@26: #define PNG_FLAG_ZLIB_CUSTOM_LEVEL        0x0002
nuclear@26: #define PNG_FLAG_ZLIB_CUSTOM_MEM_LEVEL    0x0004
nuclear@26: #define PNG_FLAG_ZLIB_CUSTOM_WINDOW_BITS  0x0008
nuclear@26: #define PNG_FLAG_ZLIB_CUSTOM_METHOD       0x0010
nuclear@26: #define PNG_FLAG_ZLIB_FINISHED            0x0020
nuclear@26: #define PNG_FLAG_ROW_INIT                 0x0040
nuclear@26: #define PNG_FLAG_FILLER_AFTER             0x0080
nuclear@26: #define PNG_FLAG_CRC_ANCILLARY_USE        0x0100
nuclear@26: #define PNG_FLAG_CRC_ANCILLARY_NOWARN     0x0200
nuclear@26: #define PNG_FLAG_CRC_CRITICAL_USE         0x0400
nuclear@26: #define PNG_FLAG_CRC_CRITICAL_IGNORE      0x0800
nuclear@26: #define PNG_FLAG_FREE_PLTE                0x1000
nuclear@26: #define PNG_FLAG_FREE_TRNS                0x2000
nuclear@26: #define PNG_FLAG_FREE_HIST                0x4000
nuclear@26: #define PNG_FLAG_KEEP_UNKNOWN_CHUNKS      0x8000L
nuclear@26: #define PNG_FLAG_KEEP_UNSAFE_CHUNKS       0x10000L
nuclear@26: #define PNG_FLAG_LIBRARY_MISMATCH         0x20000L
nuclear@26: #define PNG_FLAG_STRIP_ERROR_NUMBERS      0x40000L
nuclear@26: #define PNG_FLAG_STRIP_ERROR_TEXT         0x80000L
nuclear@26: #define PNG_FLAG_MALLOC_NULL_MEM_OK       0x100000L
nuclear@26: #define PNG_FLAG_ADD_ALPHA                0x200000L  /* Added to libpng-1.2.8 */
nuclear@26: #define PNG_FLAG_STRIP_ALPHA              0x400000L  /* Added to libpng-1.2.8 */
nuclear@26:                                   /*      0x800000L  unused */
nuclear@26:                                   /*     0x1000000L  unused */
nuclear@26:                                   /*     0x2000000L  unused */
nuclear@26:                                   /*     0x4000000L  unused */
nuclear@26:                                   /*     0x8000000L  unused */
nuclear@26:                                   /*    0x10000000L  unused */
nuclear@26:                                   /*    0x20000000L  unused */
nuclear@26:                                   /*    0x40000000L  unused */
nuclear@26: 
nuclear@26: #define PNG_FLAG_CRC_ANCILLARY_MASK (PNG_FLAG_CRC_ANCILLARY_USE | \
nuclear@26:                                      PNG_FLAG_CRC_ANCILLARY_NOWARN)
nuclear@26: 
nuclear@26: #define PNG_FLAG_CRC_CRITICAL_MASK  (PNG_FLAG_CRC_CRITICAL_USE | \
nuclear@26:                                      PNG_FLAG_CRC_CRITICAL_IGNORE)
nuclear@26: 
nuclear@26: #define PNG_FLAG_CRC_MASK           (PNG_FLAG_CRC_ANCILLARY_MASK | \
nuclear@26:                                      PNG_FLAG_CRC_CRITICAL_MASK)
nuclear@26: 
nuclear@26: /* save typing and make code easier to understand */
nuclear@26: 
nuclear@26: #define PNG_COLOR_DIST(c1, c2) (abs((int)((c1).red) - (int)((c2).red)) + \
nuclear@26:    abs((int)((c1).green) - (int)((c2).green)) + \
nuclear@26:    abs((int)((c1).blue) - (int)((c2).blue)))
nuclear@26: 
nuclear@26: /* Added to libpng-1.2.6 JB */
nuclear@26: #define PNG_ROWBYTES(pixel_bits, width) \
nuclear@26:     ((pixel_bits) >= 8 ? \
nuclear@26:     ((width) * (((png_uint_32)(pixel_bits)) >> 3)) : \
nuclear@26:     (( ((width) * ((png_uint_32)(pixel_bits))) + 7) >> 3) )
nuclear@26: 
nuclear@26: /* PNG_OUT_OF_RANGE returns true if value is outside the range
nuclear@26:    ideal-delta..ideal+delta.  Each argument is evaluated twice.
nuclear@26:    "ideal" and "delta" should be constants, normally simple
nuclear@26:    integers, "value" a variable. Added to libpng-1.2.6 JB */
nuclear@26: #define PNG_OUT_OF_RANGE(value, ideal, delta) \
nuclear@26:         ( (value) < (ideal)-(delta) || (value) > (ideal)+(delta) )
nuclear@26: 
nuclear@26: /* variables declared in png.c - only it needs to define PNG_NO_EXTERN */
nuclear@26: #if !defined(PNG_NO_EXTERN) || defined(PNG_ALWAYS_EXTERN)
nuclear@26: /* place to hold the signature string for a PNG file. */
nuclear@26: #ifdef PNG_USE_GLOBAL_ARRAYS
nuclear@26:    PNG_EXPORT_VAR (PNG_CONST png_byte FARDATA) png_sig[8];
nuclear@26: #else
nuclear@26: #endif
nuclear@26: #endif /* PNG_NO_EXTERN */
nuclear@26: 
nuclear@26: /* Constant strings for known chunk types.  If you need to add a chunk,
nuclear@26:  * define the name here, and add an invocation of the macro in png.c and
nuclear@26:  * wherever it's needed.
nuclear@26:  */
nuclear@26: #define PNG_IHDR png_byte png_IHDR[5] = { 73,  72,  68,  82, '\0'}
nuclear@26: #define PNG_IDAT png_byte png_IDAT[5] = { 73,  68,  65,  84, '\0'}
nuclear@26: #define PNG_IEND png_byte png_IEND[5] = { 73,  69,  78,  68, '\0'}
nuclear@26: #define PNG_PLTE png_byte png_PLTE[5] = { 80,  76,  84,  69, '\0'}
nuclear@26: #define PNG_bKGD png_byte png_bKGD[5] = { 98,  75,  71,  68, '\0'}
nuclear@26: #define PNG_cHRM png_byte png_cHRM[5] = { 99,  72,  82,  77, '\0'}
nuclear@26: #define PNG_gAMA png_byte png_gAMA[5] = {103,  65,  77,  65, '\0'}
nuclear@26: #define PNG_hIST png_byte png_hIST[5] = {104,  73,  83,  84, '\0'}
nuclear@26: #define PNG_iCCP png_byte png_iCCP[5] = {105,  67,  67,  80, '\0'}
nuclear@26: #define PNG_iTXt png_byte png_iTXt[5] = {105,  84,  88, 116, '\0'}
nuclear@26: #define PNG_oFFs png_byte png_oFFs[5] = {111,  70,  70, 115, '\0'}
nuclear@26: #define PNG_pCAL png_byte png_pCAL[5] = {112,  67,  65,  76, '\0'}
nuclear@26: #define PNG_sCAL png_byte png_sCAL[5] = {115,  67,  65,  76, '\0'}
nuclear@26: #define PNG_pHYs png_byte png_pHYs[5] = {112,  72,  89, 115, '\0'}
nuclear@26: #define PNG_sBIT png_byte png_sBIT[5] = {115,  66,  73,  84, '\0'}
nuclear@26: #define PNG_sPLT png_byte png_sPLT[5] = {115,  80,  76,  84, '\0'}
nuclear@26: #define PNG_sRGB png_byte png_sRGB[5] = {115,  82,  71,  66, '\0'}
nuclear@26: #define PNG_tEXt png_byte png_tEXt[5] = {116,  69,  88, 116, '\0'}
nuclear@26: #define PNG_tIME png_byte png_tIME[5] = {116,  73,  77,  69, '\0'}
nuclear@26: #define PNG_tRNS png_byte png_tRNS[5] = {116,  82,  78,  83, '\0'}
nuclear@26: #define PNG_zTXt png_byte png_zTXt[5] = {122,  84,  88, 116, '\0'}
nuclear@26: 
nuclear@26: #ifdef PNG_USE_GLOBAL_ARRAYS
nuclear@26: PNG_EXPORT_VAR (png_byte FARDATA) png_IHDR[5];
nuclear@26: PNG_EXPORT_VAR (png_byte FARDATA) png_IDAT[5];
nuclear@26: PNG_EXPORT_VAR (png_byte FARDATA) png_IEND[5];
nuclear@26: PNG_EXPORT_VAR (png_byte FARDATA) png_PLTE[5];
nuclear@26: PNG_EXPORT_VAR (png_byte FARDATA) png_bKGD[5];
nuclear@26: PNG_EXPORT_VAR (png_byte FARDATA) png_cHRM[5];
nuclear@26: PNG_EXPORT_VAR (png_byte FARDATA) png_gAMA[5];
nuclear@26: PNG_EXPORT_VAR (png_byte FARDATA) png_hIST[5];
nuclear@26: PNG_EXPORT_VAR (png_byte FARDATA) png_iCCP[5];
nuclear@26: PNG_EXPORT_VAR (png_byte FARDATA) png_iTXt[5];
nuclear@26: PNG_EXPORT_VAR (png_byte FARDATA) png_oFFs[5];
nuclear@26: PNG_EXPORT_VAR (png_byte FARDATA) png_pCAL[5];
nuclear@26: PNG_EXPORT_VAR (png_byte FARDATA) png_sCAL[5];
nuclear@26: PNG_EXPORT_VAR (png_byte FARDATA) png_pHYs[5];
nuclear@26: PNG_EXPORT_VAR (png_byte FARDATA) png_sBIT[5];
nuclear@26: PNG_EXPORT_VAR (png_byte FARDATA) png_sPLT[5];
nuclear@26: PNG_EXPORT_VAR (png_byte FARDATA) png_sRGB[5];
nuclear@26: PNG_EXPORT_VAR (png_byte FARDATA) png_tEXt[5];
nuclear@26: PNG_EXPORT_VAR (png_byte FARDATA) png_tIME[5];
nuclear@26: PNG_EXPORT_VAR (png_byte FARDATA) png_tRNS[5];
nuclear@26: PNG_EXPORT_VAR (png_byte FARDATA) png_zTXt[5];
nuclear@26: #endif /* PNG_USE_GLOBAL_ARRAYS */
nuclear@26: 
nuclear@26: #if defined(PNG_1_0_X) || defined (PNG_1_2_X)
nuclear@26: /* Initialize png_ptr struct for reading, and allocate any other memory.
nuclear@26:  * (old interface - DEPRECATED - use png_create_read_struct instead).
nuclear@26:  */
nuclear@26: extern PNG_EXPORT(void,png_read_init) PNGARG((png_structp png_ptr));
nuclear@26: #undef png_read_init
nuclear@26: #define png_read_init(png_ptr) png_read_init_3(&png_ptr, \
nuclear@26:     PNG_LIBPNG_VER_STRING,  png_sizeof(png_struct));
nuclear@26: #endif
nuclear@26: 
nuclear@26: extern PNG_EXPORT(void,png_read_init_3) PNGARG((png_structpp ptr_ptr,
nuclear@26:     png_const_charp user_png_ver, png_size_t png_struct_size));
nuclear@26: #if defined(PNG_1_0_X) || defined (PNG_1_2_X)
nuclear@26: extern PNG_EXPORT(void,png_read_init_2) PNGARG((png_structp png_ptr,
nuclear@26:     png_const_charp user_png_ver, png_size_t png_struct_size, png_size_t
nuclear@26:     png_info_size));
nuclear@26: #endif
nuclear@26: 
nuclear@26: #if defined(PNG_1_0_X) || defined (PNG_1_2_X)
nuclear@26: /* Initialize png_ptr struct for writing, and allocate any other memory.
nuclear@26:  * (old interface - DEPRECATED - use png_create_write_struct instead).
nuclear@26:  */
nuclear@26: extern PNG_EXPORT(void,png_write_init) PNGARG((png_structp png_ptr));
nuclear@26: #undef png_write_init
nuclear@26: #define png_write_init(png_ptr) png_write_init_3(&png_ptr, \
nuclear@26:     PNG_LIBPNG_VER_STRING, png_sizeof(png_struct));
nuclear@26: #endif
nuclear@26: 
nuclear@26: extern PNG_EXPORT(void,png_write_init_3) PNGARG((png_structpp ptr_ptr,
nuclear@26:     png_const_charp user_png_ver, png_size_t png_struct_size));
nuclear@26: extern PNG_EXPORT(void,png_write_init_2) PNGARG((png_structp png_ptr,
nuclear@26:     png_const_charp user_png_ver, png_size_t png_struct_size, png_size_t
nuclear@26:     png_info_size));
nuclear@26: 
nuclear@26: /* Allocate memory for an internal libpng struct */
nuclear@26: PNG_EXTERN png_voidp png_create_struct PNGARG((int type));
nuclear@26: 
nuclear@26: /* Free memory from internal libpng struct */
nuclear@26: PNG_EXTERN void png_destroy_struct PNGARG((png_voidp struct_ptr));
nuclear@26: 
nuclear@26: PNG_EXTERN png_voidp png_create_struct_2 PNGARG((int type, png_malloc_ptr
nuclear@26:   malloc_fn, png_voidp mem_ptr));
nuclear@26: PNG_EXTERN void png_destroy_struct_2 PNGARG((png_voidp struct_ptr,
nuclear@26:    png_free_ptr free_fn, png_voidp mem_ptr));
nuclear@26: 
nuclear@26: /* Free any memory that info_ptr points to and reset struct. */
nuclear@26: PNG_EXTERN void png_info_destroy PNGARG((png_structp png_ptr,
nuclear@26:    png_infop info_ptr));
nuclear@26: 
nuclear@26: #ifndef PNG_1_0_X
nuclear@26: /* Function to allocate memory for zlib. */
nuclear@26: PNG_EXTERN voidpf png_zalloc PNGARG((voidpf png_ptr, uInt items, uInt size));
nuclear@26: 
nuclear@26: /* Function to free memory for zlib */
nuclear@26: PNG_EXTERN void png_zfree PNGARG((voidpf png_ptr, voidpf ptr));
nuclear@26: 
nuclear@26: #ifdef PNG_SIZE_T
nuclear@26: /* Function to convert a sizeof an item to png_sizeof item */
nuclear@26:    PNG_EXTERN png_size_t PNGAPI png_convert_size PNGARG((size_t size));
nuclear@26: #endif
nuclear@26: 
nuclear@26: /* Next four functions are used internally as callbacks.  PNGAPI is required
nuclear@26:  * but not PNG_EXPORT.  PNGAPI added at libpng version 1.2.3. */
nuclear@26: 
nuclear@26: PNG_EXTERN void PNGAPI png_default_read_data PNGARG((png_structp png_ptr,
nuclear@26:    png_bytep data, png_size_t length));
nuclear@26: 
nuclear@26: #ifdef PNG_PROGRESSIVE_READ_SUPPORTED
nuclear@26: PNG_EXTERN void PNGAPI png_push_fill_buffer PNGARG((png_structp png_ptr,
nuclear@26:    png_bytep buffer, png_size_t length));
nuclear@26: #endif
nuclear@26: 
nuclear@26: PNG_EXTERN void PNGAPI png_default_write_data PNGARG((png_structp png_ptr,
nuclear@26:    png_bytep data, png_size_t length));
nuclear@26: 
nuclear@26: #if defined(PNG_WRITE_FLUSH_SUPPORTED)
nuclear@26: #if !defined(PNG_NO_STDIO)
nuclear@26: PNG_EXTERN void PNGAPI png_default_flush PNGARG((png_structp png_ptr));
nuclear@26: #endif
nuclear@26: #endif
nuclear@26: #else /* PNG_1_0_X */
nuclear@26: #ifdef PNG_PROGRESSIVE_READ_SUPPORTED
nuclear@26: PNG_EXTERN void png_push_fill_buffer PNGARG((png_structp png_ptr,
nuclear@26:    png_bytep buffer, png_size_t length));
nuclear@26: #endif
nuclear@26: #endif /* PNG_1_0_X */
nuclear@26: 
nuclear@26: /* Reset the CRC variable */
nuclear@26: PNG_EXTERN void png_reset_crc PNGARG((png_structp png_ptr));
nuclear@26: 
nuclear@26: /* Write the "data" buffer to whatever output you are using. */
nuclear@26: PNG_EXTERN void png_write_data PNGARG((png_structp png_ptr, png_bytep data,
nuclear@26:    png_size_t length));
nuclear@26: 
nuclear@26: /* Read data from whatever input you are using into the "data" buffer */
nuclear@26: PNG_EXTERN void png_read_data PNGARG((png_structp png_ptr, png_bytep data,
nuclear@26:    png_size_t length));
nuclear@26: 
nuclear@26: /* Read bytes into buf, and update png_ptr->crc */
nuclear@26: PNG_EXTERN void png_crc_read PNGARG((png_structp png_ptr, png_bytep buf,
nuclear@26:    png_size_t length));
nuclear@26: 
nuclear@26: /* Decompress data in a chunk that uses compression */
nuclear@26: #if defined(PNG_zTXt_SUPPORTED) || defined(PNG_iTXt_SUPPORTED) || \
nuclear@26:     defined(PNG_iCCP_SUPPORTED) || defined(PNG_sPLT_SUPPORTED)
nuclear@26: PNG_EXTERN void png_decompress_chunk PNGARG((png_structp png_ptr,
nuclear@26:    int comp_type, png_size_t chunklength,
nuclear@26:    png_size_t prefix_length, png_size_t *data_length));
nuclear@26: #endif
nuclear@26: 
nuclear@26: /* Read "skip" bytes, read the file crc, and (optionally) verify png_ptr->crc */
nuclear@26: PNG_EXTERN int png_crc_finish PNGARG((png_structp png_ptr, png_uint_32 skip));
nuclear@26: 
nuclear@26: /* Read the CRC from the file and compare it to the libpng calculated CRC */
nuclear@26: PNG_EXTERN int png_crc_error PNGARG((png_structp png_ptr));
nuclear@26: 
nuclear@26: /* Calculate the CRC over a section of data.  Note that we are only
nuclear@26:  * passing a maximum of 64K on systems that have this as a memory limit,
nuclear@26:  * since this is the maximum buffer size we can specify.
nuclear@26:  */
nuclear@26: PNG_EXTERN void png_calculate_crc PNGARG((png_structp png_ptr, png_bytep ptr,
nuclear@26:    png_size_t length));
nuclear@26: 
nuclear@26: #if defined(PNG_WRITE_FLUSH_SUPPORTED)
nuclear@26: PNG_EXTERN void png_flush PNGARG((png_structp png_ptr));
nuclear@26: #endif
nuclear@26: 
nuclear@26: /* simple function to write the signature */
nuclear@26: PNG_EXTERN void png_write_sig PNGARG((png_structp png_ptr));
nuclear@26: 
nuclear@26: /* write various chunks */
nuclear@26: 
nuclear@26: /* Write the IHDR chunk, and update the png_struct with the necessary
nuclear@26:  * information.
nuclear@26:  */
nuclear@26: PNG_EXTERN void png_write_IHDR PNGARG((png_structp png_ptr, png_uint_32 width,
nuclear@26:    png_uint_32 height,
nuclear@26:    int bit_depth, int color_type, int compression_method, int filter_method,
nuclear@26:    int interlace_method));
nuclear@26: 
nuclear@26: PNG_EXTERN void png_write_PLTE PNGARG((png_structp png_ptr, png_colorp palette,
nuclear@26:    png_uint_32 num_pal));
nuclear@26: 
nuclear@26: PNG_EXTERN void png_write_IDAT PNGARG((png_structp png_ptr, png_bytep data,
nuclear@26:    png_size_t length));
nuclear@26: 
nuclear@26: PNG_EXTERN void png_write_IEND PNGARG((png_structp png_ptr));
nuclear@26: 
nuclear@26: #if defined(PNG_WRITE_gAMA_SUPPORTED)
nuclear@26: #ifdef PNG_FLOATING_POINT_SUPPORTED
nuclear@26: PNG_EXTERN void png_write_gAMA PNGARG((png_structp png_ptr, double file_gamma));
nuclear@26: #endif
nuclear@26: #ifdef PNG_FIXED_POINT_SUPPORTED
nuclear@26: PNG_EXTERN void png_write_gAMA_fixed PNGARG((png_structp png_ptr, png_fixed_point
nuclear@26:     file_gamma));
nuclear@26: #endif
nuclear@26: #endif
nuclear@26: 
nuclear@26: #if defined(PNG_WRITE_sBIT_SUPPORTED)
nuclear@26: PNG_EXTERN void png_write_sBIT PNGARG((png_structp png_ptr, png_color_8p sbit,
nuclear@26:    int color_type));
nuclear@26: #endif
nuclear@26: 
nuclear@26: #if defined(PNG_WRITE_cHRM_SUPPORTED)
nuclear@26: #ifdef PNG_FLOATING_POINT_SUPPORTED
nuclear@26: PNG_EXTERN void png_write_cHRM PNGARG((png_structp png_ptr,
nuclear@26:    double white_x, double white_y,
nuclear@26:    double red_x, double red_y, double green_x, double green_y,
nuclear@26:    double blue_x, double blue_y));
nuclear@26: #endif
nuclear@26: #ifdef PNG_FIXED_POINT_SUPPORTED
nuclear@26: PNG_EXTERN void png_write_cHRM_fixed PNGARG((png_structp png_ptr,
nuclear@26:    png_fixed_point int_white_x, png_fixed_point int_white_y,
nuclear@26:    png_fixed_point int_red_x, png_fixed_point int_red_y, png_fixed_point
nuclear@26:    int_green_x, png_fixed_point int_green_y, png_fixed_point int_blue_x,
nuclear@26:    png_fixed_point int_blue_y));
nuclear@26: #endif
nuclear@26: #endif
nuclear@26: 
nuclear@26: #if defined(PNG_WRITE_sRGB_SUPPORTED)
nuclear@26: PNG_EXTERN void png_write_sRGB PNGARG((png_structp png_ptr,
nuclear@26:    int intent));
nuclear@26: #endif
nuclear@26: 
nuclear@26: #if defined(PNG_WRITE_iCCP_SUPPORTED)
nuclear@26: PNG_EXTERN void png_write_iCCP PNGARG((png_structp png_ptr,
nuclear@26:    png_charp name, int compression_type,
nuclear@26:    png_charp profile, int proflen));
nuclear@26:    /* Note to maintainer: profile should be png_bytep */
nuclear@26: #endif
nuclear@26: 
nuclear@26: #if defined(PNG_WRITE_sPLT_SUPPORTED)
nuclear@26: PNG_EXTERN void png_write_sPLT PNGARG((png_structp png_ptr,
nuclear@26:    png_sPLT_tp palette));
nuclear@26: #endif
nuclear@26: 
nuclear@26: #if defined(PNG_WRITE_tRNS_SUPPORTED)
nuclear@26: PNG_EXTERN void png_write_tRNS PNGARG((png_structp png_ptr, png_bytep trans,
nuclear@26:    png_color_16p values, int number, int color_type));
nuclear@26: #endif
nuclear@26: 
nuclear@26: #if defined(PNG_WRITE_bKGD_SUPPORTED)
nuclear@26: PNG_EXTERN void png_write_bKGD PNGARG((png_structp png_ptr,
nuclear@26:    png_color_16p values, int color_type));
nuclear@26: #endif
nuclear@26: 
nuclear@26: #if defined(PNG_WRITE_hIST_SUPPORTED)
nuclear@26: PNG_EXTERN void png_write_hIST PNGARG((png_structp png_ptr, png_uint_16p hist,
nuclear@26:    int num_hist));
nuclear@26: #endif
nuclear@26: 
nuclear@26: #if defined(PNG_WRITE_TEXT_SUPPORTED) || defined(PNG_WRITE_pCAL_SUPPORTED) || \
nuclear@26:     defined(PNG_WRITE_iCCP_SUPPORTED) || defined(PNG_WRITE_sPLT_SUPPORTED)
nuclear@26: PNG_EXTERN png_size_t png_check_keyword PNGARG((png_structp png_ptr,
nuclear@26:    png_charp key, png_charpp new_key));
nuclear@26: #endif
nuclear@26: 
nuclear@26: #if defined(PNG_WRITE_tEXt_SUPPORTED)
nuclear@26: PNG_EXTERN void png_write_tEXt PNGARG((png_structp png_ptr, png_charp key,
nuclear@26:    png_charp text, png_size_t text_len));
nuclear@26: #endif
nuclear@26: 
nuclear@26: #if defined(PNG_WRITE_zTXt_SUPPORTED)
nuclear@26: PNG_EXTERN void png_write_zTXt PNGARG((png_structp png_ptr, png_charp key,
nuclear@26:    png_charp text, png_size_t text_len, int compression));
nuclear@26: #endif
nuclear@26: 
nuclear@26: #if defined(PNG_WRITE_iTXt_SUPPORTED)
nuclear@26: PNG_EXTERN void png_write_iTXt PNGARG((png_structp png_ptr,
nuclear@26:    int compression, png_charp key, png_charp lang, png_charp lang_key,
nuclear@26:    png_charp text));
nuclear@26: #endif
nuclear@26: 
nuclear@26: #if defined(PNG_TEXT_SUPPORTED)  /* Added at version 1.0.14 and 1.2.4 */
nuclear@26: PNG_EXTERN int png_set_text_2 PNGARG((png_structp png_ptr,
nuclear@26:    png_infop info_ptr, png_textp text_ptr, int num_text));
nuclear@26: #endif
nuclear@26: 
nuclear@26: #if defined(PNG_WRITE_oFFs_SUPPORTED)
nuclear@26: PNG_EXTERN void png_write_oFFs PNGARG((png_structp png_ptr,
nuclear@26:    png_int_32 x_offset, png_int_32 y_offset, int unit_type));
nuclear@26: #endif
nuclear@26: 
nuclear@26: #if defined(PNG_WRITE_pCAL_SUPPORTED)
nuclear@26: PNG_EXTERN void png_write_pCAL PNGARG((png_structp png_ptr, png_charp purpose,
nuclear@26:    png_int_32 X0, png_int_32 X1, int type, int nparams,
nuclear@26:    png_charp units, png_charpp params));
nuclear@26: #endif
nuclear@26: 
nuclear@26: #if defined(PNG_WRITE_pHYs_SUPPORTED)
nuclear@26: PNG_EXTERN void png_write_pHYs PNGARG((png_structp png_ptr,
nuclear@26:    png_uint_32 x_pixels_per_unit, png_uint_32 y_pixels_per_unit,
nuclear@26:    int unit_type));
nuclear@26: #endif
nuclear@26: 
nuclear@26: #if defined(PNG_WRITE_tIME_SUPPORTED)
nuclear@26: PNG_EXTERN void png_write_tIME PNGARG((png_structp png_ptr,
nuclear@26:    png_timep mod_time));
nuclear@26: #endif
nuclear@26: 
nuclear@26: #if defined(PNG_WRITE_sCAL_SUPPORTED)
nuclear@26: #if defined(PNG_FLOATING_POINT_SUPPORTED) && !defined(PNG_NO_STDIO)
nuclear@26: PNG_EXTERN void png_write_sCAL PNGARG((png_structp png_ptr,
nuclear@26:    int unit, double width, double height));
nuclear@26: #else
nuclear@26: #ifdef PNG_FIXED_POINT_SUPPORTED
nuclear@26: PNG_EXTERN void png_write_sCAL_s PNGARG((png_structp png_ptr,
nuclear@26:    int unit, png_charp width, png_charp height));
nuclear@26: #endif
nuclear@26: #endif
nuclear@26: #endif
nuclear@26: 
nuclear@26: /* Called when finished processing a row of data */
nuclear@26: PNG_EXTERN void png_write_finish_row PNGARG((png_structp png_ptr));
nuclear@26: 
nuclear@26: /* Internal use only.   Called before first row of data */
nuclear@26: PNG_EXTERN void png_write_start_row PNGARG((png_structp png_ptr));
nuclear@26: 
nuclear@26: #if defined(PNG_READ_GAMMA_SUPPORTED)
nuclear@26: PNG_EXTERN void png_build_gamma_table PNGARG((png_structp png_ptr));
nuclear@26: #endif
nuclear@26: 
nuclear@26: /* combine a row of data, dealing with alpha, etc. if requested */
nuclear@26: PNG_EXTERN void png_combine_row PNGARG((png_structp png_ptr, png_bytep row,
nuclear@26:    int mask));
nuclear@26: 
nuclear@26: #if defined(PNG_READ_INTERLACING_SUPPORTED)
nuclear@26: /* expand an interlaced row */
nuclear@26: /* OLD pre-1.0.9 interface:
nuclear@26: PNG_EXTERN void png_do_read_interlace PNGARG((png_row_infop row_info,
nuclear@26:    png_bytep row, int pass, png_uint_32 transformations));
nuclear@26:  */
nuclear@26: PNG_EXTERN void png_do_read_interlace PNGARG((png_structp png_ptr));
nuclear@26: #endif
nuclear@26: 
nuclear@26: /* GRR TO DO (2.0 or whenever):  simplify other internal calling interfaces */
nuclear@26: 
nuclear@26: #if defined(PNG_WRITE_INTERLACING_SUPPORTED)
nuclear@26: /* grab pixels out of a row for an interlaced pass */
nuclear@26: PNG_EXTERN void png_do_write_interlace PNGARG((png_row_infop row_info,
nuclear@26:    png_bytep row, int pass));
nuclear@26: #endif
nuclear@26: 
nuclear@26: /* unfilter a row */
nuclear@26: PNG_EXTERN void png_read_filter_row PNGARG((png_structp png_ptr,
nuclear@26:    png_row_infop row_info, png_bytep row, png_bytep prev_row, int filter));
nuclear@26: 
nuclear@26: /* Choose the best filter to use and filter the row data */
nuclear@26: PNG_EXTERN void png_write_find_filter PNGARG((png_structp png_ptr,
nuclear@26:    png_row_infop row_info));
nuclear@26: 
nuclear@26: /* Write out the filtered row. */
nuclear@26: PNG_EXTERN void png_write_filtered_row PNGARG((png_structp png_ptr,
nuclear@26:    png_bytep filtered_row));
nuclear@26: /* finish a row while reading, dealing with interlacing passes, etc. */
nuclear@26: PNG_EXTERN void png_read_finish_row PNGARG((png_structp png_ptr));
nuclear@26: 
nuclear@26: /* initialize the row buffers, etc. */
nuclear@26: PNG_EXTERN void png_read_start_row PNGARG((png_structp png_ptr));
nuclear@26: /* optional call to update the users info structure */
nuclear@26: PNG_EXTERN void png_read_transform_info PNGARG((png_structp png_ptr,
nuclear@26:    png_infop info_ptr));
nuclear@26: 
nuclear@26: /* these are the functions that do the transformations */
nuclear@26: #if defined(PNG_READ_FILLER_SUPPORTED)
nuclear@26: PNG_EXTERN void png_do_read_filler PNGARG((png_row_infop row_info,
nuclear@26:    png_bytep row, png_uint_32 filler, png_uint_32 flags));
nuclear@26: #endif
nuclear@26: 
nuclear@26: #if defined(PNG_READ_SWAP_ALPHA_SUPPORTED)
nuclear@26: PNG_EXTERN void png_do_read_swap_alpha PNGARG((png_row_infop row_info,
nuclear@26:    png_bytep row));
nuclear@26: #endif
nuclear@26: 
nuclear@26: #if defined(PNG_WRITE_SWAP_ALPHA_SUPPORTED)
nuclear@26: PNG_EXTERN void png_do_write_swap_alpha PNGARG((png_row_infop row_info,
nuclear@26:    png_bytep row));
nuclear@26: #endif
nuclear@26: 
nuclear@26: #if defined(PNG_READ_INVERT_ALPHA_SUPPORTED)
nuclear@26: PNG_EXTERN void png_do_read_invert_alpha PNGARG((png_row_infop row_info,
nuclear@26:    png_bytep row));
nuclear@26: #endif
nuclear@26: 
nuclear@26: #if defined(PNG_WRITE_INVERT_ALPHA_SUPPORTED)
nuclear@26: PNG_EXTERN void png_do_write_invert_alpha PNGARG((png_row_infop row_info,
nuclear@26:    png_bytep row));
nuclear@26: #endif
nuclear@26: 
nuclear@26: #if defined(PNG_WRITE_FILLER_SUPPORTED) || \
nuclear@26:     defined(PNG_READ_STRIP_ALPHA_SUPPORTED)
nuclear@26: PNG_EXTERN void png_do_strip_filler PNGARG((png_row_infop row_info,
nuclear@26:    png_bytep row, png_uint_32 flags));
nuclear@26: #endif
nuclear@26: 
nuclear@26: #if defined(PNG_READ_SWAP_SUPPORTED) || defined(PNG_WRITE_SWAP_SUPPORTED)
nuclear@26: PNG_EXTERN void png_do_swap PNGARG((png_row_infop row_info, png_bytep row));
nuclear@26: #endif
nuclear@26: 
nuclear@26: #if defined(PNG_READ_PACKSWAP_SUPPORTED) || defined(PNG_WRITE_PACKSWAP_SUPPORTED)
nuclear@26: PNG_EXTERN void png_do_packswap PNGARG((png_row_infop row_info, png_bytep row));
nuclear@26: #endif
nuclear@26: 
nuclear@26: #if defined(PNG_READ_RGB_TO_GRAY_SUPPORTED)
nuclear@26: PNG_EXTERN int png_do_rgb_to_gray PNGARG((png_structp png_ptr, png_row_infop
nuclear@26:    row_info, png_bytep row));
nuclear@26: #endif
nuclear@26: 
nuclear@26: #if defined(PNG_READ_GRAY_TO_RGB_SUPPORTED)
nuclear@26: PNG_EXTERN void png_do_gray_to_rgb PNGARG((png_row_infop row_info,
nuclear@26:    png_bytep row));
nuclear@26: #endif
nuclear@26: 
nuclear@26: #if defined(PNG_READ_PACK_SUPPORTED)
nuclear@26: PNG_EXTERN void png_do_unpack PNGARG((png_row_infop row_info, png_bytep row));
nuclear@26: #endif
nuclear@26: 
nuclear@26: #if defined(PNG_READ_SHIFT_SUPPORTED)
nuclear@26: PNG_EXTERN void png_do_unshift PNGARG((png_row_infop row_info, png_bytep row,
nuclear@26:    png_color_8p sig_bits));
nuclear@26: #endif
nuclear@26: 
nuclear@26: #if defined(PNG_READ_INVERT_SUPPORTED) || defined(PNG_WRITE_INVERT_SUPPORTED)
nuclear@26: PNG_EXTERN void png_do_invert PNGARG((png_row_infop row_info, png_bytep row));
nuclear@26: #endif
nuclear@26: 
nuclear@26: #if defined(PNG_READ_16_TO_8_SUPPORTED)
nuclear@26: PNG_EXTERN void png_do_chop PNGARG((png_row_infop row_info, png_bytep row));
nuclear@26: #endif
nuclear@26: 
nuclear@26: #if defined(PNG_READ_DITHER_SUPPORTED)
nuclear@26: PNG_EXTERN void png_do_dither PNGARG((png_row_infop row_info,
nuclear@26:    png_bytep row, png_bytep palette_lookup, png_bytep dither_lookup));
nuclear@26: 
nuclear@26: #  if defined(PNG_CORRECT_PALETTE_SUPPORTED)
nuclear@26: PNG_EXTERN void png_correct_palette PNGARG((png_structp png_ptr,
nuclear@26:    png_colorp palette, int num_palette));
nuclear@26: #  endif
nuclear@26: #endif
nuclear@26: 
nuclear@26: #if defined(PNG_READ_BGR_SUPPORTED) || defined(PNG_WRITE_BGR_SUPPORTED)
nuclear@26: PNG_EXTERN void png_do_bgr PNGARG((png_row_infop row_info, png_bytep row));
nuclear@26: #endif
nuclear@26: 
nuclear@26: #if defined(PNG_WRITE_PACK_SUPPORTED)
nuclear@26: PNG_EXTERN void png_do_pack PNGARG((png_row_infop row_info,
nuclear@26:    png_bytep row, png_uint_32 bit_depth));
nuclear@26: #endif
nuclear@26: 
nuclear@26: #if defined(PNG_WRITE_SHIFT_SUPPORTED)
nuclear@26: PNG_EXTERN void png_do_shift PNGARG((png_row_infop row_info, png_bytep row,
nuclear@26:    png_color_8p bit_depth));
nuclear@26: #endif
nuclear@26: 
nuclear@26: #if defined(PNG_READ_BACKGROUND_SUPPORTED)
nuclear@26: #if defined(PNG_READ_GAMMA_SUPPORTED)
nuclear@26: PNG_EXTERN void png_do_background PNGARG((png_row_infop row_info, png_bytep row,
nuclear@26:    png_color_16p trans_values, png_color_16p background,
nuclear@26:    png_color_16p background_1,
nuclear@26:    png_bytep gamma_table, png_bytep gamma_from_1, png_bytep gamma_to_1,
nuclear@26:    png_uint_16pp gamma_16, png_uint_16pp gamma_16_from_1,
nuclear@26:    png_uint_16pp gamma_16_to_1, int gamma_shift));
nuclear@26: #else
nuclear@26: PNG_EXTERN void png_do_background PNGARG((png_row_infop row_info, png_bytep row,
nuclear@26:    png_color_16p trans_values, png_color_16p background));
nuclear@26: #endif
nuclear@26: #endif
nuclear@26: 
nuclear@26: #if defined(PNG_READ_GAMMA_SUPPORTED)
nuclear@26: PNG_EXTERN void png_do_gamma PNGARG((png_row_infop row_info, png_bytep row,
nuclear@26:    png_bytep gamma_table, png_uint_16pp gamma_16_table,
nuclear@26:    int gamma_shift));
nuclear@26: #endif
nuclear@26: 
nuclear@26: #if defined(PNG_READ_EXPAND_SUPPORTED)
nuclear@26: PNG_EXTERN void png_do_expand_palette PNGARG((png_row_infop row_info,
nuclear@26:    png_bytep row, png_colorp palette, png_bytep trans, int num_trans));
nuclear@26: PNG_EXTERN void png_do_expand PNGARG((png_row_infop row_info,
nuclear@26:    png_bytep row, png_color_16p trans_value));
nuclear@26: #endif
nuclear@26: 
nuclear@26: /* The following decodes the appropriate chunks, and does error correction,
nuclear@26:  * then calls the appropriate callback for the chunk if it is valid.
nuclear@26:  */
nuclear@26: 
nuclear@26: /* decode the IHDR chunk */
nuclear@26: PNG_EXTERN void png_handle_IHDR PNGARG((png_structp png_ptr, png_infop info_ptr,
nuclear@26:    png_uint_32 length));
nuclear@26: PNG_EXTERN void png_handle_PLTE PNGARG((png_structp png_ptr, png_infop info_ptr,
nuclear@26:    png_uint_32 length));
nuclear@26: PNG_EXTERN void png_handle_IEND PNGARG((png_structp png_ptr, png_infop info_ptr,
nuclear@26:    png_uint_32 length));
nuclear@26: 
nuclear@26: #if defined(PNG_READ_bKGD_SUPPORTED)
nuclear@26: PNG_EXTERN void png_handle_bKGD PNGARG((png_structp png_ptr, png_infop info_ptr,
nuclear@26:    png_uint_32 length));
nuclear@26: #endif
nuclear@26: 
nuclear@26: #if defined(PNG_READ_cHRM_SUPPORTED)
nuclear@26: PNG_EXTERN void png_handle_cHRM PNGARG((png_structp png_ptr, png_infop info_ptr,
nuclear@26:    png_uint_32 length));
nuclear@26: #endif
nuclear@26: 
nuclear@26: #if defined(PNG_READ_gAMA_SUPPORTED)
nuclear@26: PNG_EXTERN void png_handle_gAMA PNGARG((png_structp png_ptr, png_infop info_ptr,
nuclear@26:    png_uint_32 length));
nuclear@26: #endif
nuclear@26: 
nuclear@26: #if defined(PNG_READ_hIST_SUPPORTED)
nuclear@26: PNG_EXTERN void png_handle_hIST PNGARG((png_structp png_ptr, png_infop info_ptr,
nuclear@26:    png_uint_32 length));
nuclear@26: #endif
nuclear@26: 
nuclear@26: #if defined(PNG_READ_iCCP_SUPPORTED)
nuclear@26: extern void png_handle_iCCP PNGARG((png_structp png_ptr, png_infop info_ptr,
nuclear@26:    png_uint_32 length));
nuclear@26: #endif /* PNG_READ_iCCP_SUPPORTED */
nuclear@26: 
nuclear@26: #if defined(PNG_READ_iTXt_SUPPORTED)
nuclear@26: PNG_EXTERN void png_handle_iTXt PNGARG((png_structp png_ptr, png_infop info_ptr,
nuclear@26:    png_uint_32 length));
nuclear@26: #endif
nuclear@26: 
nuclear@26: #if defined(PNG_READ_oFFs_SUPPORTED)
nuclear@26: PNG_EXTERN void png_handle_oFFs PNGARG((png_structp png_ptr, png_infop info_ptr,
nuclear@26:    png_uint_32 length));
nuclear@26: #endif
nuclear@26: 
nuclear@26: #if defined(PNG_READ_pCAL_SUPPORTED)
nuclear@26: PNG_EXTERN void png_handle_pCAL PNGARG((png_structp png_ptr, png_infop info_ptr,
nuclear@26:    png_uint_32 length));
nuclear@26: #endif
nuclear@26: 
nuclear@26: #if defined(PNG_READ_pHYs_SUPPORTED)
nuclear@26: PNG_EXTERN void png_handle_pHYs PNGARG((png_structp png_ptr, png_infop info_ptr,
nuclear@26:    png_uint_32 length));
nuclear@26: #endif
nuclear@26: 
nuclear@26: #if defined(PNG_READ_sBIT_SUPPORTED)
nuclear@26: PNG_EXTERN void png_handle_sBIT PNGARG((png_structp png_ptr, png_infop info_ptr,
nuclear@26:    png_uint_32 length));
nuclear@26: #endif
nuclear@26: 
nuclear@26: #if defined(PNG_READ_sCAL_SUPPORTED)
nuclear@26: PNG_EXTERN void png_handle_sCAL PNGARG((png_structp png_ptr, png_infop info_ptr,
nuclear@26:    png_uint_32 length));
nuclear@26: #endif
nuclear@26: 
nuclear@26: #if defined(PNG_READ_sPLT_SUPPORTED)
nuclear@26: extern void png_handle_sPLT PNGARG((png_structp png_ptr, png_infop info_ptr,
nuclear@26:    png_uint_32 length));
nuclear@26: #endif /* PNG_READ_sPLT_SUPPORTED */
nuclear@26: 
nuclear@26: #if defined(PNG_READ_sRGB_SUPPORTED)
nuclear@26: PNG_EXTERN void png_handle_sRGB PNGARG((png_structp png_ptr, png_infop info_ptr,
nuclear@26:    png_uint_32 length));
nuclear@26: #endif
nuclear@26: 
nuclear@26: #if defined(PNG_READ_tEXt_SUPPORTED)
nuclear@26: PNG_EXTERN void png_handle_tEXt PNGARG((png_structp png_ptr, png_infop info_ptr,
nuclear@26:    png_uint_32 length));
nuclear@26: #endif
nuclear@26: 
nuclear@26: #if defined(PNG_READ_tIME_SUPPORTED)
nuclear@26: PNG_EXTERN void png_handle_tIME PNGARG((png_structp png_ptr, png_infop info_ptr,
nuclear@26:    png_uint_32 length));
nuclear@26: #endif
nuclear@26: 
nuclear@26: #if defined(PNG_READ_tRNS_SUPPORTED)
nuclear@26: PNG_EXTERN void png_handle_tRNS PNGARG((png_structp png_ptr, png_infop info_ptr,
nuclear@26:    png_uint_32 length));
nuclear@26: #endif
nuclear@26: 
nuclear@26: #if defined(PNG_READ_zTXt_SUPPORTED)
nuclear@26: PNG_EXTERN void png_handle_zTXt PNGARG((png_structp png_ptr, png_infop info_ptr,
nuclear@26:    png_uint_32 length));
nuclear@26: #endif
nuclear@26: 
nuclear@26: PNG_EXTERN void png_handle_unknown PNGARG((png_structp png_ptr,
nuclear@26:    png_infop info_ptr, png_uint_32 length));
nuclear@26: 
nuclear@26: PNG_EXTERN void png_check_chunk_name PNGARG((png_structp png_ptr,
nuclear@26:    png_bytep chunk_name));
nuclear@26: 
nuclear@26: /* handle the transformations for reading and writing */
nuclear@26: PNG_EXTERN void png_do_read_transformations PNGARG((png_structp png_ptr));
nuclear@26: PNG_EXTERN void png_do_write_transformations PNGARG((png_structp png_ptr));
nuclear@26: 
nuclear@26: PNG_EXTERN void png_init_read_transformations PNGARG((png_structp png_ptr));
nuclear@26: 
nuclear@26: #ifdef PNG_PROGRESSIVE_READ_SUPPORTED
nuclear@26: PNG_EXTERN void png_push_read_chunk PNGARG((png_structp png_ptr,
nuclear@26:    png_infop info_ptr));
nuclear@26: PNG_EXTERN void png_push_read_sig PNGARG((png_structp png_ptr,
nuclear@26:    png_infop info_ptr));
nuclear@26: PNG_EXTERN void png_push_check_crc PNGARG((png_structp png_ptr));
nuclear@26: PNG_EXTERN void png_push_crc_skip PNGARG((png_structp png_ptr,
nuclear@26:    png_uint_32 length));
nuclear@26: PNG_EXTERN void png_push_crc_finish PNGARG((png_structp png_ptr));
nuclear@26: PNG_EXTERN void png_push_save_buffer PNGARG((png_structp png_ptr));
nuclear@26: PNG_EXTERN void png_push_restore_buffer PNGARG((png_structp png_ptr,
nuclear@26:    png_bytep buffer, png_size_t buffer_length));
nuclear@26: PNG_EXTERN void png_push_read_IDAT PNGARG((png_structp png_ptr));
nuclear@26: PNG_EXTERN void png_process_IDAT_data PNGARG((png_structp png_ptr,
nuclear@26:    png_bytep buffer, png_size_t buffer_length));
nuclear@26: PNG_EXTERN void png_push_process_row PNGARG((png_structp png_ptr));
nuclear@26: PNG_EXTERN void png_push_handle_unknown PNGARG((png_structp png_ptr,
nuclear@26:    png_infop info_ptr, png_uint_32 length));
nuclear@26: PNG_EXTERN void png_push_have_info PNGARG((png_structp png_ptr,
nuclear@26:    png_infop info_ptr));
nuclear@26: PNG_EXTERN void png_push_have_end PNGARG((png_structp png_ptr,
nuclear@26:    png_infop info_ptr));
nuclear@26: PNG_EXTERN void png_push_have_row PNGARG((png_structp png_ptr, png_bytep row));
nuclear@26: PNG_EXTERN void png_push_read_end PNGARG((png_structp png_ptr,
nuclear@26:    png_infop info_ptr));
nuclear@26: PNG_EXTERN void png_process_some_data PNGARG((png_structp png_ptr,
nuclear@26:    png_infop info_ptr));
nuclear@26: PNG_EXTERN void png_read_push_finish_row PNGARG((png_structp png_ptr));
nuclear@26: #if defined(PNG_READ_tEXt_SUPPORTED)
nuclear@26: PNG_EXTERN void png_push_handle_tEXt PNGARG((png_structp png_ptr,
nuclear@26:    png_infop info_ptr, png_uint_32 length));
nuclear@26: PNG_EXTERN void png_push_read_tEXt PNGARG((png_structp png_ptr,
nuclear@26:    png_infop info_ptr));
nuclear@26: #endif
nuclear@26: #if defined(PNG_READ_zTXt_SUPPORTED)
nuclear@26: PNG_EXTERN void png_push_handle_zTXt PNGARG((png_structp png_ptr,
nuclear@26:    png_infop info_ptr, png_uint_32 length));
nuclear@26: PNG_EXTERN void png_push_read_zTXt PNGARG((png_structp png_ptr,
nuclear@26:    png_infop info_ptr));
nuclear@26: #endif
nuclear@26: #if defined(PNG_READ_iTXt_SUPPORTED)
nuclear@26: PNG_EXTERN void png_push_handle_iTXt PNGARG((png_structp png_ptr,
nuclear@26:    png_infop info_ptr, png_uint_32 length));
nuclear@26: PNG_EXTERN void png_push_read_iTXt PNGARG((png_structp png_ptr,
nuclear@26:    png_infop info_ptr));
nuclear@26: #endif
nuclear@26: 
nuclear@26: #endif /* PNG_PROGRESSIVE_READ_SUPPORTED */
nuclear@26: 
nuclear@26: #ifdef PNG_MNG_FEATURES_SUPPORTED
nuclear@26: PNG_EXTERN void png_do_read_intrapixel PNGARG((png_row_infop row_info,
nuclear@26:    png_bytep row));
nuclear@26: PNG_EXTERN void png_do_write_intrapixel PNGARG((png_row_infop row_info,
nuclear@26:    png_bytep row));
nuclear@26: #endif
nuclear@26: 
nuclear@26: #if defined(PNG_ASSEMBLER_CODE_SUPPORTED)
nuclear@26: #if defined(PNG_MMX_CODE_SUPPORTED)
nuclear@26: /* png.c */ /* PRIVATE */
nuclear@26: PNG_EXTERN void png_init_mmx_flags PNGARG((png_structp png_ptr));
nuclear@26: #endif
nuclear@26: #endif
nuclear@26: 
nuclear@26: #if defined(PNG_INCH_CONVERSIONS) && defined(PNG_FLOATING_POINT_SUPPORTED)
nuclear@26: PNG_EXTERN png_uint_32 png_get_pixels_per_inch PNGARG((png_structp png_ptr,
nuclear@26: png_infop info_ptr));
nuclear@26: 
nuclear@26: PNG_EXTERN png_uint_32 png_get_x_pixels_per_inch PNGARG((png_structp png_ptr,
nuclear@26: png_infop info_ptr));
nuclear@26: 
nuclear@26: PNG_EXTERN png_uint_32 png_get_y_pixels_per_inch PNGARG((png_structp png_ptr,
nuclear@26: png_infop info_ptr));
nuclear@26: 
nuclear@26: PNG_EXTERN float png_get_x_offset_inches PNGARG((png_structp png_ptr,
nuclear@26: png_infop info_ptr));
nuclear@26: 
nuclear@26: PNG_EXTERN float png_get_y_offset_inches PNGARG((png_structp png_ptr,
nuclear@26: png_infop info_ptr));
nuclear@26: 
nuclear@26: #if defined(PNG_pHYs_SUPPORTED)
nuclear@26: PNG_EXTERN png_uint_32 png_get_pHYs_dpi PNGARG((png_structp png_ptr,
nuclear@26: png_infop info_ptr, png_uint_32 *res_x, png_uint_32 *res_y, int *unit_type));
nuclear@26: #endif /* PNG_pHYs_SUPPORTED */
nuclear@26: #endif  /* PNG_INCH_CONVERSIONS && PNG_FLOATING_POINT_SUPPORTED */
nuclear@26: 
nuclear@26: /* Read the chunk header (length + type name) */
nuclear@26: PNG_EXTERN png_uint_32 png_read_chunk_header PNGARG((png_structp png_ptr));
nuclear@26: 
nuclear@26: /* Maintainer: Put new private prototypes here ^ and in libpngpf.3 */
nuclear@26: 
nuclear@26: #endif /* PNG_INTERNAL */
nuclear@26: 
nuclear@26: #ifdef __cplusplus
nuclear@26: }
nuclear@26: #endif
nuclear@26: 
nuclear@26: #endif /* PNG_VERSION_INFO_ONLY */
nuclear@26: /* do not put anything past this line */
nuclear@26: #endif /* PNG_H */