/* png.h - header file for PNG reference library+
−
 *+
−
 * libpng version 1.2.40 - September 10, 2009+
−
 * Copyright (c) 1998-2009 Glenn Randers-Pehrson+
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 * (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger)+
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 * (Version 0.88 Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.)+
−
 *+
−
 * This code is released under the libpng license (See LICENSE, below)+
−
 *+
−
 * Authors and maintainers:+
−
 *  libpng versions 0.71, May 1995, through 0.88, January 1996: Guy Schalnat+
−
 *  libpng versions 0.89c, June 1996, through 0.96, May 1997: Andreas Dilger+
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 *  libpng versions 0.97, January 1998, through 1.2.40 - September 10, 2009: Glenn+
−
 *  See also "Contributing Authors", below.+
−
 *+
−
 * Note about libpng version numbers:+
−
 *+
−
 *    Due to various miscommunications, unforeseen code incompatibilities+
−
 *    and occasional factors outside the authors' control, version numbering+
−
 *    on the library has not always been consistent and straightforward.+
−
 *    The following table summarizes matters since version 0.89c, which was+
−
 *    the first widely used release:+
−
 *+
−
 *    source                 png.h  png.h  shared-lib+
−
 *    version                string   int  version+
−
 *    -------                ------ -----  ----------+
−
 *    0.89c "1.0 beta 3"     0.89      89  1.0.89+
−
 *    0.90  "1.0 beta 4"     0.90      90  0.90  [should have been 2.0.90]+
−
 *    0.95  "1.0 beta 5"     0.95      95  0.95  [should have been 2.0.95]+
−
 *    0.96  "1.0 beta 6"     0.96      96  0.96  [should have been 2.0.96]+
−
 *    0.97b "1.00.97 beta 7" 1.00.97   97  1.0.1 [should have been 2.0.97]+
−
 *    0.97c                  0.97      97  2.0.97+
−
 *    0.98                   0.98      98  2.0.98+
−
 *    0.99                   0.99      98  2.0.99+
−
 *    0.99a-m                0.99      99  2.0.99+
−
 *    1.00                   1.00     100  2.1.0 [100 should be 10000]+
−
 *    1.0.0      (from here on, the   100  2.1.0 [100 should be 10000]+
−
 *    1.0.1       png.h string is   10001  2.1.0+
−
 *    1.0.1a-e    identical to the  10002  from here on, the shared library+
−
 *    1.0.2       source version)   10002  is 2.V where V is the source code+
−
 *    1.0.2a-b                      10003  version, except as noted.+
−
 *    1.0.3                         10003+
−
 *    1.0.3a-d                      10004+
−
 *    1.0.4                         10004+
−
 *    1.0.4a-f                      10005+
−
 *    1.0.5 (+ 2 patches)           10005+
−
 *    1.0.5a-d                      10006+
−
 *    1.0.5e-r                      10100 (not source compatible)+
−
 *    1.0.5s-v                      10006 (not binary compatible)+
−
 *    1.0.6 (+ 3 patches)           10006 (still binary incompatible)+
−
 *    1.0.6d-f                      10007 (still binary incompatible)+
−
 *    1.0.6g                        10007+
−
 *    1.0.6h                        10007  10.6h (testing xy.z so-numbering)+
−
 *    1.0.6i                        10007  10.6i+
−
 *    1.0.6j                        10007  2.1.0.6j (incompatible with 1.0.0)+
−
 *    1.0.7beta11-14        DLLNUM  10007  2.1.0.7beta11-14 (binary compatible)+
−
 *    1.0.7beta15-18           1    10007  2.1.0.7beta15-18 (binary compatible)+
−
 *    1.0.7rc1-2               1    10007  2.1.0.7rc1-2 (binary compatible)+
−
 *    1.0.7                    1    10007  (still compatible)+
−
 *    1.0.8beta1-4             1    10008  2.1.0.8beta1-4+
−
 *    1.0.8rc1                 1    10008  2.1.0.8rc1+
−
 *    1.0.8                    1    10008  2.1.0.8+
−
 *    1.0.9beta1-6             1    10009  2.1.0.9beta1-6+
−
 *    1.0.9rc1                 1    10009  2.1.0.9rc1+
−
 *    1.0.9beta7-10            1    10009  2.1.0.9beta7-10+
−
 *    1.0.9rc2                 1    10009  2.1.0.9rc2+
−
 *    1.0.9                    1    10009  2.1.0.9+
−
 *    1.0.10beta1              1    10010  2.1.0.10beta1+
−
 *    1.0.10rc1                1    10010  2.1.0.10rc1+
−
 *    1.0.10                   1    10010  2.1.0.10+
−
 *    1.0.11beta1-3            1    10011  2.1.0.11beta1-3+
−
 *    1.0.11rc1                1    10011  2.1.0.11rc1+
−
 *    1.0.11                   1    10011  2.1.0.11+
−
 *    1.0.12beta1-2            2    10012  2.1.0.12beta1-2+
−
 *    1.0.12rc1                2    10012  2.1.0.12rc1+
−
 *    1.0.12                   2    10012  2.1.0.12+
−
 *    1.1.0a-f                 -    10100  2.1.1.0a-f (branch abandoned)+
−
 *    1.2.0beta1-2             2    10200  2.1.2.0beta1-2+
−
 *    1.2.0beta3-5             3    10200  3.1.2.0beta3-5+
−
 *    1.2.0rc1                 3    10200  3.1.2.0rc1+
−
 *    1.2.0                    3    10200  3.1.2.0+
−
 *    1.2.1beta1-4             3    10201  3.1.2.1beta1-4+
−
 *    1.2.1rc1-2               3    10201  3.1.2.1rc1-2+
−
 *    1.2.1                    3    10201  3.1.2.1+
−
 *    1.2.2beta1-6            12    10202  12.so.0.1.2.2beta1-6+
−
 *    1.0.13beta1             10    10013  10.so.0.1.0.13beta1+
−
 *    1.0.13rc1               10    10013  10.so.0.1.0.13rc1+
−
 *    1.2.2rc1                12    10202  12.so.0.1.2.2rc1+
−
 *    1.0.13                  10    10013  10.so.0.1.0.13+
−
 *    1.2.2                   12    10202  12.so.0.1.2.2+
−
 *    1.2.3rc1-6              12    10203  12.so.0.1.2.3rc1-6+
−
 *    1.2.3                   12    10203  12.so.0.1.2.3+
−
 *    1.2.4beta1-3            13    10204  12.so.0.1.2.4beta1-3+
−
 *    1.0.14rc1               13    10014  10.so.0.1.0.14rc1+
−
 *    1.2.4rc1                13    10204  12.so.0.1.2.4rc1+
−
 *    1.0.14                  10    10014  10.so.0.1.0.14+
−
 *    1.2.4                   13    10204  12.so.0.1.2.4+
−
 *    1.2.5beta1-2            13    10205  12.so.0.1.2.5beta1-2+
−
 *    1.0.15rc1-3             10    10015  10.so.0.1.0.15rc1-3+
−
 *    1.2.5rc1-3              13    10205  12.so.0.1.2.5rc1-3+
−
 *    1.0.15                  10    10015  10.so.0.1.0.15+
−
 *    1.2.5                   13    10205  12.so.0.1.2.5+
−
 *    1.2.6beta1-4            13    10206  12.so.0.1.2.6beta1-4+
−
 *    1.0.16                  10    10016  10.so.0.1.0.16+
−
 *    1.2.6                   13    10206  12.so.0.1.2.6+
−
 *    1.2.7beta1-2            13    10207  12.so.0.1.2.7beta1-2+
−
 *    1.0.17rc1               10    10017  10.so.0.1.0.17rc1+
−
 *    1.2.7rc1                13    10207  12.so.0.1.2.7rc1+
−
 *    1.0.17                  10    10017  10.so.0.1.0.17+
−
 *    1.2.7                   13    10207  12.so.0.1.2.7+
−
 *    1.2.8beta1-5            13    10208  12.so.0.1.2.8beta1-5+
−
 *    1.0.18rc1-5             10    10018  10.so.0.1.0.18rc1-5+
−
 *    1.2.8rc1-5              13    10208  12.so.0.1.2.8rc1-5+
−
 *    1.0.18                  10    10018  10.so.0.1.0.18+
−
 *    1.2.8                   13    10208  12.so.0.1.2.8+
−
 *    1.2.9beta1-3            13    10209  12.so.0.1.2.9beta1-3+
−
 *    1.2.9beta4-11           13    10209  12.so.0.9[.0]+
−
 *    1.2.9rc1                13    10209  12.so.0.9[.0]+
−
 *    1.2.9                   13    10209  12.so.0.9[.0]+
−
 *    1.2.10beta1-8           13    10210  12.so.0.10[.0]+
−
 *    1.2.10rc1-3             13    10210  12.so.0.10[.0]+
−
 *    1.2.10                  13    10210  12.so.0.10[.0]+
−
 *    1.2.11beta1-4           13    10211  12.so.0.11[.0]+
−
 *    1.0.19rc1-5             10    10019  10.so.0.19[.0]+
−
 *    1.2.11rc1-5             13    10211  12.so.0.11[.0]+
−
 *    1.0.19                  10    10019  10.so.0.19[.0]+
−
 *    1.2.11                  13    10211  12.so.0.11[.0]+
−
 *    1.0.20                  10    10020  10.so.0.20[.0]+
−
 *    1.2.12                  13    10212  12.so.0.12[.0]+
−
 *    1.2.13beta1             13    10213  12.so.0.13[.0]+
−
 *    1.0.21                  10    10021  10.so.0.21[.0]+
−
 *    1.2.13                  13    10213  12.so.0.13[.0]+
−
 *    1.2.14beta1-2           13    10214  12.so.0.14[.0]+
−
 *    1.0.22rc1               10    10022  10.so.0.22[.0]+
−
 *    1.2.14rc1               13    10214  12.so.0.14[.0]+
−
 *    1.0.22                  10    10022  10.so.0.22[.0]+
−
 *    1.2.14                  13    10214  12.so.0.14[.0]+
−
 *    1.2.15beta1-6           13    10215  12.so.0.15[.0]+
−
 *    1.0.23rc1-5             10    10023  10.so.0.23[.0]+
−
 *    1.2.15rc1-5             13    10215  12.so.0.15[.0]+
−
 *    1.0.23                  10    10023  10.so.0.23[.0]+
−
 *    1.2.15                  13    10215  12.so.0.15[.0]+
−
 *    1.2.16beta1-2           13    10216  12.so.0.16[.0]+
−
 *    1.2.16rc1               13    10216  12.so.0.16[.0]+
−
 *    1.0.24                  10    10024  10.so.0.24[.0]+
−
 *    1.2.16                  13    10216  12.so.0.16[.0]+
−
 *    1.2.17beta1-2           13    10217  12.so.0.17[.0]+
−
 *    1.0.25rc1               10    10025  10.so.0.25[.0]+
−
 *    1.2.17rc1-3             13    10217  12.so.0.17[.0]+
−
 *    1.0.25                  10    10025  10.so.0.25[.0]+
−
 *    1.2.17                  13    10217  12.so.0.17[.0]+
−
 *    1.0.26                  10    10026  10.so.0.26[.0]+
−
 *    1.2.18                  13    10218  12.so.0.18[.0]+
−
 *    1.2.19beta1-31          13    10219  12.so.0.19[.0]+
−
 *    1.0.27rc1-6             10    10027  10.so.0.27[.0]+
−
 *    1.2.19rc1-6             13    10219  12.so.0.19[.0]+
−
 *    1.0.27                  10    10027  10.so.0.27[.0]+
−
 *    1.2.19                  13    10219  12.so.0.19[.0]+
−
 *    1.2.20beta01-04         13    10220  12.so.0.20[.0]+
−
 *    1.0.28rc1-6             10    10028  10.so.0.28[.0]+
−
 *    1.2.20rc1-6             13    10220  12.so.0.20[.0]+
−
 *    1.0.28                  10    10028  10.so.0.28[.0]+
−
 *    1.2.20                  13    10220  12.so.0.20[.0]+
−
 *    1.2.21beta1-2           13    10221  12.so.0.21[.0]+
−
 *    1.2.21rc1-3             13    10221  12.so.0.21[.0]+
−
 *    1.0.29                  10    10029  10.so.0.29[.0]+
−
 *    1.2.21                  13    10221  12.so.0.21[.0]+
−
 *    1.2.22beta1-4           13    10222  12.so.0.22[.0]+
−
 *    1.0.30rc1               10    10030  10.so.0.30[.0]+
−
 *    1.2.22rc1               13    10222  12.so.0.22[.0]+
−
 *    1.0.30                  10    10030  10.so.0.30[.0]+
−
 *    1.2.22                  13    10222  12.so.0.22[.0]+
−
 *    1.2.23beta01-05         13    10223  12.so.0.23[.0]+
−
 *    1.2.23rc01              13    10223  12.so.0.23[.0]+
−
 *    1.2.23                  13    10223  12.so.0.23[.0]+
−
 *    1.2.24beta01-02         13    10224  12.so.0.24[.0]+
−
 *    1.2.24rc01              13    10224  12.so.0.24[.0]+
−
 *    1.2.24                  13    10224  12.so.0.24[.0]+
−
 *    1.2.25beta01-06         13    10225  12.so.0.25[.0]+
−
 *    1.2.25rc01-02           13    10225  12.so.0.25[.0]+
−
 *    1.0.31                  10    10031  10.so.0.31[.0]+
−
 *    1.2.25                  13    10225  12.so.0.25[.0]+
−
 *    1.2.26beta01-06         13    10226  12.so.0.26[.0]+
−
 *    1.2.26rc01              13    10226  12.so.0.26[.0]+
−
 *    1.2.26                  13    10226  12.so.0.26[.0]+
−
 *    1.0.32                  10    10032  10.so.0.32[.0]+
−
 *    1.2.27beta01-06         13    10227  12.so.0.27[.0]+
−
 *    1.2.27rc01              13    10227  12.so.0.27[.0]+
−
 *    1.0.33                  10    10033  10.so.0.33[.0]+
−
 *    1.2.27                  13    10227  12.so.0.27[.0]+
−
 *    1.0.34                  10    10034  10.so.0.34[.0]+
−
 *    1.2.28                  13    10228  12.so.0.28[.0]+
−
 *    1.2.29beta01-03         13    10229  12.so.0.29[.0]+
−
 *    1.2.29rc01              13    10229  12.so.0.29[.0]+
−
 *    1.0.35                  10    10035  10.so.0.35[.0]+
−
 *    1.2.29                  13    10229  12.so.0.29[.0]+
−
 *    1.0.37                  10    10037  10.so.0.37[.0]+
−
 *    1.2.30beta01-04         13    10230  12.so.0.30[.0]+
−
 *    1.0.38rc01-08           10    10038  10.so.0.38[.0]+
−
 *    1.2.30rc01-08           13    10230  12.so.0.30[.0]+
−
 *    1.0.38                  10    10038  10.so.0.38[.0]+
−
 *    1.2.30                  13    10230  12.so.0.30[.0]+
−
 *    1.0.39rc01-03           10    10039  10.so.0.39[.0]+
−
 *    1.2.31rc01-03           13    10231  12.so.0.31[.0]+
−
 *    1.0.39                  10    10039  10.so.0.39[.0]+
−
 *    1.2.31                  13    10231  12.so.0.31[.0]+
−
 *    1.2.32beta01-02         13    10232  12.so.0.32[.0]+
−
 *    1.0.40rc01              10    10040  10.so.0.40[.0]+
−
 *    1.2.32rc01              13    10232  12.so.0.32[.0]+
−
 *    1.0.40                  10    10040  10.so.0.40[.0]+
−
 *    1.2.32                  13    10232  12.so.0.32[.0]+
−
 *    1.2.33beta01-02         13    10233  12.so.0.33[.0]+
−
 *    1.2.33rc01-02           13    10233  12.so.0.33[.0]+
−
 *    1.0.41rc01              10    10041  10.so.0.41[.0]+
−
 *    1.2.33                  13    10233  12.so.0.33[.0]+
−
 *    1.0.41                  10    10041  10.so.0.41[.0]+
−
 *    1.2.34beta01-07         13    10234  12.so.0.34[.0]+
−
 *    1.0.42rc01              10    10042  10.so.0.42[.0]+
−
 *    1.2.34rc01              13    10234  12.so.0.34[.0]+
−
 *    1.0.42                  10    10042  10.so.0.42[.0]+
−
 *    1.2.34                  13    10234  12.so.0.34[.0]+
−
 *    1.2.35beta01-03         13    10235  12.so.0.35[.0]+
−
 *    1.0.43rc01-02           10    10043  10.so.0.43[.0]+
−
 *    1.2.35rc01-02           13    10235  12.so.0.35[.0]+
−
 *    1.0.43                  10    10043  10.so.0.43[.0]+
−
 *    1.2.35                  13    10235  12.so.0.35[.0]+
−
 *    1.2.36beta01-05         13    10236  12.so.0.36[.0]+
−
 *    1.2.36rc01              13    10236  12.so.0.36[.0]+
−
 *    1.0.44                  10    10044  10.so.0.44[.0]+
−
 *    1.2.36                  13    10236  12.so.0.36[.0]+
−
 *    1.2.37beta01-03         13    10237  12.so.0.37[.0]+
−
 *    1.2.37rc01              13    10237  12.so.0.37[.0]+
−
 *    1.2.37                  13    10237  12.so.0.37[.0]+
−
 *    1.2.45                  10    10045  12.so.0.45[.0]+
−
 *    1.0.46                  10    10046  10.so.0.46[.0]+
−
 *    1.2.38beta01            13    10238  12.so.0.38[.0]+
−
 *    1.2.38rc01-03           13    10238  12.so.0.38[.0]+
−
 *    1.0.47                  10    10047  10.so.0.47[.0]+
−
 *    1.2.38                  13    10238  12.so.0.38[.0]+
−
 *    1.2.39beta01-05         13    10239  12.so.0.39[.0]+
−
 *    1.2.39rc01              13    10239  12.so.0.39[.0]+
−
 *    1.0.48                  10    10048  10.so.0.48[.0]+
−
 *    1.2.39                  13    10239  12.so.0.39[.0]+
−
 *    1.2.40beta01            13    10240  12.so.0.40[.0]+
−
 *    1.2.40rc01              13    10240  12.so.0.40[.0]+
−
 *    1.0.49                  10    10049  10.so.0.49[.0]+
−
 *    1.2.40                  13    10240  12.so.0.40[.0]+
−
 *+
−
 *    Henceforth the source version will match the shared-library major+
−
 *    and minor numbers; the shared-library major version number will be+
−
 *    used for changes in backward compatibility, as it is intended.  The+
−
 *    PNG_LIBPNG_VER macro, which is not used within libpng but is available+
−
 *    for applications, is an unsigned integer of the form xyyzz corresponding+
−
 *    to the source version x.y.z (leading zeros in y and z).  Beta versions+
−
 *    were given the previous public release number plus a letter, until+
−
 *    version 1.0.6j; from then on they were given the upcoming public+
−
 *    release number plus "betaNN" or "rcNN".+
−
 *+
−
 *    Binary incompatibility exists only when applications make direct access+
−
 *    to the info_ptr or png_ptr members through png.h, and the compiled+
−
 *    application is loaded with a different version of the library.+
−
 *+
−
 *    DLLNUM will change each time there are forward or backward changes+
−
 *    in binary compatibility (e.g., when a new feature is added).+
−
 *+
−
 * See libpng.txt or libpng.3 for more information.  The PNG specification+
−
 * is available as a W3C Recommendation and as an ISO Specification,+
−
 * <http://www.w3.org/TR/2003/REC-PNG-20031110/+
−
 */+
−
+
−
/*+
−
 * COPYRIGHT NOTICE, DISCLAIMER, and LICENSE:+
−
 *+
−
 * If you modify libpng you may insert additional notices immediately following+
−
 * this sentence.+
−
 *+
−
 * This code is released under the libpng license.+
−
 *+
−
 * libpng versions 1.2.6, August 15, 2004, through 1.2.40, September 10, 2009, are+
−
 * Copyright (c) 2004, 2006-2009 Glenn Randers-Pehrson, and are+
−
 * distributed according to the same disclaimer and license as libpng-1.2.5+
−
 * with the following individual added to the list of Contributing Authors:+
−
 *+
−
 *    Cosmin Truta+
−
 *+
−
 * libpng versions 1.0.7, July 1, 2000, through 1.2.5, October 3, 2002, are+
−
 * Copyright (c) 2000-2002 Glenn Randers-Pehrson, and are+
−
 * distributed according to the same disclaimer and license as libpng-1.0.6+
−
 * with the following individuals added to the list of Contributing Authors:+
−
 *+
−
 *    Simon-Pierre Cadieux+
−
 *    Eric S. Raymond+
−
 *    Gilles Vollant+
−
 *+
−
 * and with the following additions to the disclaimer:+
−
 *+
−
 *    There is no warranty against interference with your enjoyment of the+
−
 *    library or against infringement.  There is no warranty that our+
−
 *    efforts or the library will fulfill any of your particular purposes+
−
 *    or needs.  This library is provided with all faults, and the entire+
−
 *    risk of satisfactory quality, performance, accuracy, and effort is with+
−
 *    the user.+
−
 *+
−
 * libpng versions 0.97, January 1998, through 1.0.6, March 20, 2000, are+
−
 * Copyright (c) 1998, 1999, 2000 Glenn Randers-Pehrson, and are+
−
 * distributed according to the same disclaimer and license as libpng-0.96,+
−
 * with the following individuals added to the list of Contributing Authors:+
−
 *+
−
 *    Tom Lane+
−
 *    Glenn Randers-Pehrson+
−
 *    Willem van Schaik+
−
 *+
−
 * libpng versions 0.89, June 1996, through 0.96, May 1997, are+
−
 * Copyright (c) 1996, 1997 Andreas Dilger+
−
 * Distributed according to the same disclaimer and license as libpng-0.88,+
−
 * with the following individuals added to the list of Contributing Authors:+
−
 *+
−
 *    John Bowler+
−
 *    Kevin Bracey+
−
 *    Sam Bushell+
−
 *    Magnus Holmgren+
−
 *    Greg Roelofs+
−
 *    Tom Tanner+
−
 *+
−
 * libpng versions 0.5, May 1995, through 0.88, January 1996, are+
−
 * Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.+
−
 *+
−
 * For the purposes of this copyright and license, "Contributing Authors"+
−
 * is defined as the following set of individuals:+
−
 *+
−
 *    Andreas Dilger+
−
 *    Dave Martindale+
−
 *    Guy Eric Schalnat+
−
 *    Paul Schmidt+
−
 *    Tim Wegner+
−
 *+
−
 * The PNG Reference Library is supplied "AS IS".  The Contributing Authors+
−
 * and Group 42, Inc. disclaim all warranties, expressed or implied,+
−
 * including, without limitation, the warranties of merchantability and of+
−
 * fitness for any purpose.  The Contributing Authors and Group 42, Inc.+
−
 * assume no liability for direct, indirect, incidental, special, exemplary,+
−
 * or consequential damages, which may result from the use of the PNG+
−
 * Reference Library, even if advised of the possibility of such damage.+
−
 *+
−
 * Permission is hereby granted to use, copy, modify, and distribute this+
−
 * source code, or portions hereof, for any purpose, without fee, subject+
−
 * to the following restrictions:+
−
 *+
−
 * 1. The origin of this source code must not be misrepresented.+
−
 *+
−
 * 2. Altered versions must be plainly marked as such and+
−
 * must not be misrepresented as being the original source.+
−
 *+
−
 * 3. This Copyright notice may not be removed or altered from+
−
 *    any source or altered source distribution.+
−
 *+
−
 * The Contributing Authors and Group 42, Inc. specifically permit, without+
−
 * fee, and encourage the use of this source code as a component to+
−
 * supporting the PNG file format in commercial products.  If you use this+
−
 * source code in a product, acknowledgment is not required but would be+
−
 * appreciated.+
−
 */+
−
+
−
/*+
−
 * A "png_get_copyright" function is available, for convenient use in "about"+
−
 * boxes and the like:+
−
 *+
−
 * printf("%s",png_get_copyright(NULL));+
−
 *+
−
 * Also, the PNG logo (in PNG format, of course) is supplied in the+
−
 * files "pngbar.png" and "pngbar.jpg (88x31) and "pngnow.png" (98x31).+
−
 */+
−
+
−
/*+
−
 * Libpng is OSI Certified Open Source Software.  OSI Certified is a+
−
 * certification mark of the Open Source Initiative.+
−
 */+
−
+
−
/*+
−
 * The contributing authors would like to thank all those who helped+
−
 * with testing, bug fixes, and patience.  This wouldn't have been+
−
 * possible without all of you.+
−
 *+
−
 * Thanks to Frank J. T. Wojcik for helping with the documentation.+
−
 */+
−
+
−
/*+
−
 * Y2K compliance in libpng:+
−
 * =========================+
−
 *+
−
 *    September 10, 2009+
−
 *+
−
 *    Since the PNG Development group is an ad-hoc body, we can't make+
−
 *    an official declaration.+
−
 *+
−
 *    This is your unofficial assurance that libpng from version 0.71 and+
−
 *    upward through 1.2.40 are Y2K compliant.  It is my belief that earlier+
−
 *    versions were also Y2K compliant.+
−
 *+
−
 *    Libpng only has three year fields.  One is a 2-byte unsigned integer+
−
 *    that will hold years up to 65535.  The other two hold the date in text+
−
 *    format, and will hold years up to 9999.+
−
 *+
−
 *    The integer is+
−
 *        "png_uint_16 year" in png_time_struct.+
−
 *+
−
 *    The strings are+
−
 *        "png_charp time_buffer" in png_struct and+
−
 *        "near_time_buffer", which is a local character string in png.c.+
−
 *+
−
 *    There are seven time-related functions:+
−
 *        png.c: png_convert_to_rfc_1123() in png.c+
−
 *          (formerly png_convert_to_rfc_1152() in error)+
−
 *        png_convert_from_struct_tm() in pngwrite.c, called in pngwrite.c+
−
 *        png_convert_from_time_t() in pngwrite.c+
−
 *        png_get_tIME() in pngget.c+
−
 *        png_handle_tIME() in pngrutil.c, called in pngread.c+
−
 *        png_set_tIME() in pngset.c+
−
 *        png_write_tIME() in pngwutil.c, called in pngwrite.c+
−
 *+
−
 *    All handle dates properly in a Y2K environment.  The+
−
 *    png_convert_from_time_t() function calls gmtime() to convert from system+
−
 *    clock time, which returns (year - 1900), which we properly convert to+
−
 *    the full 4-digit year.  There is a possibility that applications using+
−
 *    libpng are not passing 4-digit years into the png_convert_to_rfc_1123()+
−
 *    function, or that they are incorrectly passing only a 2-digit year+
−
 *    instead of "year - 1900" into the png_convert_from_struct_tm() function,+
−
 *    but this is not under our control.  The libpng documentation has always+
−
 *    stated that it works with 4-digit years, and the APIs have been+
−
 *    documented as such.+
−
 *+
−
 *    The tIME chunk itself is also Y2K compliant.  It uses a 2-byte unsigned+
−
 *    integer to hold the year, and can hold years as large as 65535.+
−
 *+
−
 *    zlib, upon which libpng depends, is also Y2K compliant.  It contains+
−
 *    no date-related code.+
−
 *+
−
 *       Glenn Randers-Pehrson+
−
 *       libpng maintainer+
−
 *       PNG Development Group+
−
 */+
−
+
−
#ifndef PNG_H+
−
#define PNG_H+
−
+
−
/* This is not the place to learn how to use libpng.  The file libpng.txt+
−
 * describes how to use libpng, and the file example.c summarizes it+
−
 * with some code on which to build.  This file is useful for looking+
−
 * at the actual function definitions and structure components.+
−
 */+
−
+
−
/* Version information for png.h - this should match the version in png.c */+
−
#define PNG_LIBPNG_VER_STRING "1.2.40"+
−
#define PNG_HEADER_VERSION_STRING \+
−
   " libpng version 1.2.40 - September 10, 2009\n"+
−
+
−
#define PNG_LIBPNG_VER_SONUM   0+
−
#define PNG_LIBPNG_VER_DLLNUM  13+
−
+
−
/* These should match the first 3 components of PNG_LIBPNG_VER_STRING: */+
−
#define PNG_LIBPNG_VER_MAJOR   1+
−
#define PNG_LIBPNG_VER_MINOR   2+
−
#define PNG_LIBPNG_VER_RELEASE 40+
−
/* This should match the numeric part of the final component of+
−
 * PNG_LIBPNG_VER_STRING, omitting any leading zero:+
−
 */+
−
+
−
#define PNG_LIBPNG_VER_BUILD  0+
−
+
−
/* Release Status */+
−
#define PNG_LIBPNG_BUILD_ALPHA    1+
−
#define PNG_LIBPNG_BUILD_BETA     2+
−
#define PNG_LIBPNG_BUILD_RC       3+
−
#define PNG_LIBPNG_BUILD_STABLE   4+
−
#define PNG_LIBPNG_BUILD_RELEASE_STATUS_MASK 7+
−
+
−
/* Release-Specific Flags */+
−
#define PNG_LIBPNG_BUILD_PATCH    8 /* Can be OR'ed with+
−
                                       PNG_LIBPNG_BUILD_STABLE only */+
−
#define PNG_LIBPNG_BUILD_PRIVATE 16 /* Cannot be OR'ed with+
−
                                       PNG_LIBPNG_BUILD_SPECIAL */+
−
#define PNG_LIBPNG_BUILD_SPECIAL 32 /* Cannot be OR'ed with+
−
                                       PNG_LIBPNG_BUILD_PRIVATE */+
−
+
−
#define PNG_LIBPNG_BUILD_BASE_TYPE PNG_LIBPNG_BUILD_STABLE+
−
+
−
/* Careful here.  At one time, Guy wanted to use 082, but that would be octal.+
−
 * We must not include leading zeros.+
−
 * Versions 0.7 through 1.0.0 were in the range 0 to 100 here (only+
−
 * version 1.0.0 was mis-numbered 100 instead of 10000).  From+
−
 * version 1.0.1 it's    xxyyzz, where x=major, y=minor, z=release+
−
 */+
−
#define PNG_LIBPNG_VER 10240 /* 1.2.40 */+
−
+
−
#ifndef PNG_VERSION_INFO_ONLY+
−
/* Include the compression library's header */+
−
#include "zlib.h"+
−
#endif+
−
+
−
/* Include all user configurable info, including optional assembler routines */+
−
#include "pngconf.h"+
−
+
−
/*+
−
 * Added at libpng-1.2.8 */+
−
/* Ref MSDN: Private as priority over Special+
−
 * VS_FF_PRIVATEBUILD File *was not* built using standard release+
−
 * procedures. If this value is given, the StringFileInfo block must+
−
 * contain a PrivateBuild string.+
−
 *+
−
 * VS_FF_SPECIALBUILD File *was* built by the original company using+
−
 * standard release procedures but is a variation of the standard+
−
 * file of the same version number. If this value is given, the+
−
 * StringFileInfo block must contain a SpecialBuild string.+
−
 */+
−
+
−
#if defined(PNG_USER_PRIVATEBUILD)+
−
#  define PNG_LIBPNG_BUILD_TYPE \+
−
          (PNG_LIBPNG_BUILD_BASE_TYPE | PNG_LIBPNG_BUILD_PRIVATE)+
−
#else+
−
#  if defined(PNG_LIBPNG_SPECIALBUILD)+
−
#    define PNG_LIBPNG_BUILD_TYPE \+
−
            (PNG_LIBPNG_BUILD_BASE_TYPE | PNG_LIBPNG_BUILD_SPECIAL)+
−
#  else+
−
#    define PNG_LIBPNG_BUILD_TYPE (PNG_LIBPNG_BUILD_BASE_TYPE)+
−
#  endif+
−
#endif+
−
+
−
#ifndef PNG_VERSION_INFO_ONLY+
−
+
−
/* Inhibit C++ name-mangling for libpng functions but not for system calls. */+
−
#ifdef __cplusplus+
−
extern "C" {+
−
#endif /* __cplusplus */+
−
+
−
/* This file is arranged in several sections.  The first section contains+
−
 * structure and type definitions.  The second section contains the external+
−
 * library functions, while the third has the internal library functions,+
−
 * which applications aren't expected to use directly.+
−
 */+
−
+
−
#ifndef PNG_NO_TYPECAST_NULL+
−
#define int_p_NULL                (int *)NULL+
−
#define png_bytep_NULL            (png_bytep)NULL+
−
#define png_bytepp_NULL           (png_bytepp)NULL+
−
#define png_doublep_NULL          (png_doublep)NULL+
−
#define png_error_ptr_NULL        (png_error_ptr)NULL+
−
#define png_flush_ptr_NULL        (png_flush_ptr)NULL+
−
#define png_free_ptr_NULL         (png_free_ptr)NULL+
−
#define png_infopp_NULL           (png_infopp)NULL+
−
#define png_malloc_ptr_NULL       (png_malloc_ptr)NULL+
−
#define png_read_status_ptr_NULL  (png_read_status_ptr)NULL+
−
#define png_rw_ptr_NULL           (png_rw_ptr)NULL+
−
#define png_structp_NULL          (png_structp)NULL+
−
#define png_uint_16p_NULL         (png_uint_16p)NULL+
−
#define png_voidp_NULL            (png_voidp)NULL+
−
#define png_write_status_ptr_NULL (png_write_status_ptr)NULL+
−
#else+
−
#define int_p_NULL                NULL+
−
#define png_bytep_NULL            NULL+
−
#define png_bytepp_NULL           NULL+
−
#define png_doublep_NULL          NULL+
−
#define png_error_ptr_NULL        NULL+
−
#define png_flush_ptr_NULL        NULL+
−
#define png_free_ptr_NULL         NULL+
−
#define png_infopp_NULL           NULL+
−
#define png_malloc_ptr_NULL       NULL+
−
#define png_read_status_ptr_NULL  NULL+
−
#define png_rw_ptr_NULL           NULL+
−
#define png_structp_NULL          NULL+
−
#define png_uint_16p_NULL         NULL+
−
#define png_voidp_NULL            NULL+
−
#define png_write_status_ptr_NULL NULL+
−
#endif+
−
+
−
/* Variables declared in png.c - only it needs to define PNG_NO_EXTERN */+
−
#if !defined(PNG_NO_EXTERN) || defined(PNG_ALWAYS_EXTERN)+
−
/* Version information for C files, stored in png.c.  This had better match+
−
 * the version above.+
−
 */+
−
#ifdef PNG_USE_GLOBAL_ARRAYS+
−
PNG_EXPORT_VAR (PNG_CONST char) png_libpng_ver[18];+
−
  /* Need room for 99.99.99beta99z */+
−
#else+
−
#define png_libpng_ver png_get_header_ver(NULL)+
−
#endif+
−
+
−
#ifdef PNG_USE_GLOBAL_ARRAYS+
−
/* This was removed in version 1.0.5c */+
−
/* Structures to facilitate easy interlacing.  See png.c for more details */+
−
PNG_EXPORT_VAR (PNG_CONST int FARDATA) png_pass_start[7];+
−
PNG_EXPORT_VAR (PNG_CONST int FARDATA) png_pass_inc[7];+
−
PNG_EXPORT_VAR (PNG_CONST int FARDATA) png_pass_ystart[7];+
−
PNG_EXPORT_VAR (PNG_CONST int FARDATA) png_pass_yinc[7];+
−
PNG_EXPORT_VAR (PNG_CONST int FARDATA) png_pass_mask[7];+
−
PNG_EXPORT_VAR (PNG_CONST int FARDATA) png_pass_dsp_mask[7];+
−
/* This isn't currently used.  If you need it, see png.c for more details.+
−
PNG_EXPORT_VAR (PNG_CONST int FARDATA) png_pass_height[7];+
−
*/+
−
#endif+
−
+
−
#endif /* PNG_NO_EXTERN */+
−
+
−
/* Three color definitions.  The order of the red, green, and blue, (and the+
−
 * exact size) is not important, although the size of the fields need to+
−
 * be png_byte or png_uint_16 (as defined below).+
−
 */+
−
typedef struct png_color_struct+
−
{+
−
   png_byte red;+
−
   png_byte green;+
−
   png_byte blue;+
−
} png_color;+
−
typedef png_color FAR * png_colorp;+
−
typedef png_color FAR * FAR * png_colorpp;+
−
+
−
typedef struct png_color_16_struct+
−
{+
−
   png_byte index;    /* used for palette files */+
−
   png_uint_16 red;   /* for use in red green blue files */+
−
   png_uint_16 green;+
−
   png_uint_16 blue;+
−
   png_uint_16 gray;  /* for use in grayscale files */+
−
} png_color_16;+
−
typedef png_color_16 FAR * png_color_16p;+
−
typedef png_color_16 FAR * FAR * png_color_16pp;+
−
+
−
typedef struct png_color_8_struct+
−
{+
−
   png_byte red;   /* for use in red green blue files */+
−
   png_byte green;+
−
   png_byte blue;+
−
   png_byte gray;  /* for use in grayscale files */+
−
   png_byte alpha; /* for alpha channel files */+
−
} png_color_8;+
−
typedef png_color_8 FAR * png_color_8p;+
−
typedef png_color_8 FAR * FAR * png_color_8pp;+
−
+
−
/*+
−
 * The following two structures are used for the in-core representation+
−
 * of sPLT chunks.+
−
 */+
−
typedef struct png_sPLT_entry_struct+
−
{+
−
   png_uint_16 red;+
−
   png_uint_16 green;+
−
   png_uint_16 blue;+
−
   png_uint_16 alpha;+
−
   png_uint_16 frequency;+
−
} png_sPLT_entry;+
−
typedef png_sPLT_entry FAR * png_sPLT_entryp;+
−
typedef png_sPLT_entry FAR * FAR * png_sPLT_entrypp;+
−
+
−
/*  When the depth of the sPLT palette is 8 bits, the color and alpha samples+
−
 *  occupy the LSB of their respective members, and the MSB of each member+
−
 *  is zero-filled.  The frequency member always occupies the full 16 bits.+
−
 */+
−
+
−
typedef struct png_sPLT_struct+
−
{+
−
   png_charp name;           /* palette name */+
−
   png_byte depth;           /* depth of palette samples */+
−
   png_sPLT_entryp entries;  /* palette entries */+
−
   png_int_32 nentries;      /* number of palette entries */+
−
} png_sPLT_t;+
−
typedef png_sPLT_t FAR * png_sPLT_tp;+
−
typedef png_sPLT_t FAR * FAR * png_sPLT_tpp;+
−
+
−
#ifdef PNG_TEXT_SUPPORTED+
−
/* png_text holds the contents of a text/ztxt/itxt chunk in a PNG file,+
−
 * and whether that contents is compressed or not.  The "key" field+
−
 * points to a regular zero-terminated C string.  The "text", "lang", and+
−
 * "lang_key" fields can be regular C strings, empty strings, or NULL pointers.+
−
 * However, the * structure returned by png_get_text() will always contain+
−
 * regular zero-terminated C strings (possibly empty), never NULL pointers,+
−
 * so they can be safely used in printf() and other string-handling functions.+
−
 */+
−
typedef struct png_text_struct+
−
{+
−
   int  compression;       /* compression value:+
−
                             -1: tEXt, none+
−
                              0: zTXt, deflate+
−
                              1: iTXt, none+
−
                              2: iTXt, deflate  */+
−
   png_charp key;          /* keyword, 1-79 character description of "text" */+
−
   png_charp text;         /* comment, may be an empty string (ie "")+
−
                              or a NULL pointer */+
−
   png_size_t text_length; /* length of the text string */+
−
#ifdef PNG_iTXt_SUPPORTED+
−
   png_size_t itxt_length; /* length of the itxt string */+
−
   png_charp lang;         /* language code, 0-79 characters+
−
                              or a NULL pointer */+
−
   png_charp lang_key;     /* keyword translated UTF-8 string, 0 or more+
−
                              chars or a NULL pointer */+
−
#endif+
−
} png_text;+
−
typedef png_text FAR * png_textp;+
−
typedef png_text FAR * FAR * png_textpp;+
−
#endif+
−
+
−
/* Supported compression types for text in PNG files (tEXt, and zTXt).+
−
 * The values of the PNG_TEXT_COMPRESSION_ defines should NOT be changed.+
−
 */+
−
#define PNG_TEXT_COMPRESSION_NONE_WR -3+
−
#define PNG_TEXT_COMPRESSION_zTXt_WR -2+
−
#define PNG_TEXT_COMPRESSION_NONE    -1+
−
#define PNG_TEXT_COMPRESSION_zTXt     0+
−
#define PNG_ITXT_COMPRESSION_NONE     1+
−
#define PNG_ITXT_COMPRESSION_zTXt     2+
−
#define PNG_TEXT_COMPRESSION_LAST     3  /* Not a valid value */+
−
+
−
/* png_time is a way to hold the time in an machine independent way.+
−
 * Two conversions are provided, both from time_t and struct tm.  There+
−
 * is no portable way to convert to either of these structures, as far+
−
 * as I know.  If you know of a portable way, send it to me.  As a side+
−
 * note - PNG has always been Year 2000 compliant!+
−
 */+
−
typedef struct png_time_struct+
−
{+
−
   png_uint_16 year; /* full year, as in, 1995 */+
−
   png_byte month;   /* month of year, 1 - 12 */+
−
   png_byte day;     /* day of month, 1 - 31 */+
−
   png_byte hour;    /* hour of day, 0 - 23 */+
−
   png_byte minute;  /* minute of hour, 0 - 59 */+
−
   png_byte second;  /* second of minute, 0 - 60 (for leap seconds) */+
−
} png_time;+
−
typedef png_time FAR * png_timep;+
−
typedef png_time FAR * FAR * png_timepp;+
−
+
−
#if defined(PNG_UNKNOWN_CHUNKS_SUPPORTED) || \+
−
 defined(PNG_HANDLE_AS_UNKNOWN_SUPPORTED)+
−
/* png_unknown_chunk is a structure to hold queued chunks for which there is+
−
 * no specific support.  The idea is that we can use this to queue+
−
 * up private chunks for output even though the library doesn't actually+
−
 * know about their semantics.+
−
 */+
−
#define PNG_CHUNK_NAME_LENGTH 5+
−
typedef struct png_unknown_chunk_t+
−
{+
−
    png_byte name[PNG_CHUNK_NAME_LENGTH];+
−
    png_byte *data;+
−
    png_size_t size;+
−
+
−
    /* libpng-using applications should NOT directly modify this byte. */+
−
    png_byte location; /* mode of operation at read time */+
−
}+
−
png_unknown_chunk;+
−
typedef png_unknown_chunk FAR * png_unknown_chunkp;+
−
typedef png_unknown_chunk FAR * FAR * png_unknown_chunkpp;+
−
#endif+
−
+
−
/* png_info is a structure that holds the information in a PNG file so+
−
 * that the application can find out the characteristics of the image.+
−
 * If you are reading the file, this structure will tell you what is+
−
 * in the PNG file.  If you are writing the file, fill in the information+
−
 * you want to put into the PNG file, then call png_write_info().+
−
 * The names chosen should be very close to the PNG specification, so+
−
 * consult that document for information about the meaning of each field.+
−
 *+
−
 * With libpng < 0.95, it was only possible to directly set and read the+
−
 * the values in the png_info_struct, which meant that the contents and+
−
 * order of the values had to remain fixed.  With libpng 0.95 and later,+
−
 * however, there are now functions that abstract the contents of+
−
 * png_info_struct from the application, so this makes it easier to use+
−
 * libpng with dynamic libraries, and even makes it possible to use+
−
 * libraries that don't have all of the libpng ancillary chunk-handing+
−
 * functionality.+
−
 *+
−
 * In any case, the order of the parameters in png_info_struct should NOT+
−
 * be changed for as long as possible to keep compatibility with applications+
−
 * that use the old direct-access method with png_info_struct.+
−
 *+
−
 * The following members may have allocated storage attached that should be+
−
 * cleaned up before the structure is discarded: palette, trans, text,+
−
 * pcal_purpose, pcal_units, pcal_params, hist, iccp_name, iccp_profile,+
−
 * splt_palettes, scal_unit, row_pointers, and unknowns.   By default, these+
−
 * are automatically freed when the info structure is deallocated, if they were+
−
 * allocated internally by libpng.  This behavior can be changed by means+
−
 * of the png_data_freer() function.+
−
 *+
−
 * More allocation details: all the chunk-reading functions that+
−
 * change these members go through the corresponding png_set_*+
−
 * functions.  A function to clear these members is available: see+
−
 * png_free_data().  The png_set_* functions do not depend on being+
−
 * able to point info structure members to any of the storage they are+
−
 * passed (they make their own copies), EXCEPT that the png_set_text+
−
 * functions use the same storage passed to them in the text_ptr or+
−
 * itxt_ptr structure argument, and the png_set_rows and png_set_unknowns+
−
 * functions do not make their own copies.+
−
 */+
−
typedef struct png_info_struct+
−
{+
−
   /* The following are necessary for every PNG file */+
−
   png_uint_32 width;       /* width of image in pixels (from IHDR) */+
−
   png_uint_32 height;      /* height of image in pixels (from IHDR) */+
−
   png_uint_32 valid;       /* valid chunk data (see PNG_INFO_ below) */+
−
   png_uint_32 rowbytes;    /* bytes needed to hold an untransformed row */+
−
   png_colorp palette;      /* array of color values (valid & PNG_INFO_PLTE) */+
−
   png_uint_16 num_palette; /* number of color entries in "palette" (PLTE) */+
−
   png_uint_16 num_trans;   /* number of transparent palette color (tRNS) */+
−
   png_byte bit_depth;      /* 1, 2, 4, 8, or 16 bits/channel (from IHDR) */+
−
   png_byte color_type;     /* see PNG_COLOR_TYPE_ below (from IHDR) */+
−
   /* The following three should have been named *_method not *_type */+
−
   png_byte compression_type; /* must be PNG_COMPRESSION_TYPE_BASE (IHDR) */+
−
   png_byte filter_type;    /* must be PNG_FILTER_TYPE_BASE (from IHDR) */+
−
   png_byte interlace_type; /* One of PNG_INTERLACE_NONE, PNG_INTERLACE_ADAM7 */+
−
+
−
   /* The following is informational only on read, and not used on writes. */+
−
   png_byte channels;       /* number of data channels per pixel (1, 2, 3, 4) */+
−
   png_byte pixel_depth;    /* number of bits per pixel */+
−
   png_byte spare_byte;     /* to align the data, and for future use */+
−
   png_byte signature[8];   /* magic bytes read by libpng from start of file */+
−
+
−
   /* The rest of the data is optional.  If you are reading, check the+
−
    * valid field to see if the information in these are valid.  If you+
−
    * are writing, set the valid field to those chunks you want written,+
−
    * and initialize the appropriate fields below.+
−
    */+
−
+
−
#if defined(PNG_gAMA_SUPPORTED) && defined(PNG_FLOATING_POINT_SUPPORTED)+
−
   /* The gAMA chunk describes the gamma characteristics of the system+
−
    * on which the image was created, normally in the range [1.0, 2.5].+
−
    * Data is valid if (valid & PNG_INFO_gAMA) is non-zero.+
−
    */+
−
   float gamma; /* gamma value of image, if (valid & PNG_INFO_gAMA) */+
−
#endif+
−
+
−
#if defined(PNG_sRGB_SUPPORTED)+
−
    /* GR-P, 0.96a */+
−
    /* Data valid if (valid & PNG_INFO_sRGB) non-zero. */+
−
   png_byte srgb_intent; /* sRGB rendering intent [0, 1, 2, or 3] */+
−
#endif+
−
+
−
#if defined(PNG_TEXT_SUPPORTED)+
−
   /* The tEXt, and zTXt chunks contain human-readable textual data in+
−
    * uncompressed, compressed, and optionally compressed forms, respectively.+
−
    * The data in "text" is an array of pointers to uncompressed,+
−
    * null-terminated C strings. Each chunk has a keyword that describes the+
−
    * textual data contained in that chunk.  Keywords are not required to be+
−
    * unique, and the text string may be empty.  Any number of text chunks may+
−
    * be in an image.+
−
    */+
−
   int num_text; /* number of comments read/to write */+
−
   int max_text; /* current size of text array */+
−
   png_textp text; /* array of comments read/to write */+
−
#endif /* PNG_TEXT_SUPPORTED */+
−
+
−
#if defined(PNG_tIME_SUPPORTED)+
−
   /* The tIME chunk holds the last time the displayed image data was+
−
    * modified.  See the png_time struct for the contents of this struct.+
−
    */+
−
   png_time mod_time;+
−
#endif+
−
+
−
#if defined(PNG_sBIT_SUPPORTED)+
−
   /* The sBIT chunk specifies the number of significant high-order bits+
−
    * in the pixel data.  Values are in the range [1, bit_depth], and are+
−
    * only specified for the channels in the pixel data.  The contents of+
−
    * the low-order bits is not specified.  Data is valid if+
−
    * (valid & PNG_INFO_sBIT) is non-zero.+
−
    */+
−
   png_color_8 sig_bit; /* significant bits in color channels */+
−
#endif+
−
+
−
#if defined(PNG_tRNS_SUPPORTED) || defined(PNG_READ_EXPAND_SUPPORTED) || \+
−
defined(PNG_READ_BACKGROUND_SUPPORTED)+
−
   /* The tRNS chunk supplies transparency data for paletted images and+
−
    * other image types that don't need a full alpha channel.  There are+
−
    * "num_trans" transparency values for a paletted image, stored in the+
−
    * same order as the palette colors, starting from index 0.  Values+
−
    * for the data are in the range [0, 255], ranging from fully transparent+
−
    * to fully opaque, respectively.  For non-paletted images, there is a+
−
    * single color specified that should be treated as fully transparent.+
−
    * Data is valid if (valid & PNG_INFO_tRNS) is non-zero.+
−
    */+
−
   png_bytep trans; /* transparent values for paletted image */+
−
   png_color_16 trans_values; /* transparent color for non-palette image */+
−
#endif+
−
+
−
#if defined(PNG_bKGD_SUPPORTED) || defined(PNG_READ_BACKGROUND_SUPPORTED)+
−
   /* The bKGD chunk gives the suggested image background color if the+
−
    * display program does not have its own background color and the image+
−
    * is needs to composited onto a background before display.  The colors+
−
    * in "background" are normally in the same color space/depth as the+
−
    * pixel data.  Data is valid if (valid & PNG_INFO_bKGD) is non-zero.+
−
    */+
−
   png_color_16 background;+
−
#endif+
−
+
−
#if defined(PNG_oFFs_SUPPORTED)+
−
   /* The oFFs chunk gives the offset in "offset_unit_type" units rightwards+
−
    * and downwards from the top-left corner of the display, page, or other+
−
    * application-specific co-ordinate space.  See the PNG_OFFSET_ defines+
−
    * below for the unit types.  Valid if (valid & PNG_INFO_oFFs) non-zero.+
−
    */+
−
   png_int_32 x_offset; /* x offset on page */+
−
   png_int_32 y_offset; /* y offset on page */+
−
   png_byte offset_unit_type; /* offset units type */+
−
#endif+
−
+
−
#if defined(PNG_pHYs_SUPPORTED)+
−
   /* The pHYs chunk gives the physical pixel density of the image for+
−
    * display or printing in "phys_unit_type" units (see PNG_RESOLUTION_+
−
    * defines below).  Data is valid if (valid & PNG_INFO_pHYs) is non-zero.+
−
    */+
−
   png_uint_32 x_pixels_per_unit; /* horizontal pixel density */+
−
   png_uint_32 y_pixels_per_unit; /* vertical pixel density */+
−
   png_byte phys_unit_type; /* resolution type (see PNG_RESOLUTION_ below) */+
−
#endif+
−
+
−
#if defined(PNG_hIST_SUPPORTED)+
−
   /* The hIST chunk contains the relative frequency or importance of the+
−
    * various palette entries, so that a viewer can intelligently select a+
−
    * reduced-color palette, if required.  Data is an array of "num_palette"+
−
    * values in the range [0,65535]. Data valid if (valid & PNG_INFO_hIST)+
−
    * is non-zero.+
−
    */+
−
   png_uint_16p hist;+
−
#endif+
−
+
−
#ifdef PNG_cHRM_SUPPORTED+
−
   /* The cHRM chunk describes the CIE color characteristics of the monitor+
−
    * on which the PNG was created.  This data allows the viewer to do gamut+
−
    * mapping of the input image to ensure that the viewer sees the same+
−
    * colors in the image as the creator.  Values are in the range+
−
    * [0.0, 0.8].  Data valid if (valid & PNG_INFO_cHRM) non-zero.+
−
    */+
−
#ifdef PNG_FLOATING_POINT_SUPPORTED+
−
   float x_white;+
−
   float y_white;+
−
   float x_red;+
−
   float y_red;+
−
   float x_green;+
−
   float y_green;+
−
   float x_blue;+
−
   float y_blue;+
−
#endif+
−
#endif+
−
+
−
#if defined(PNG_pCAL_SUPPORTED)+
−
   /* The pCAL chunk describes a transformation between the stored pixel+
−
    * values and original physical data values used to create the image.+
−
    * The integer range [0, 2^bit_depth - 1] maps to the floating-point+
−
    * range given by [pcal_X0, pcal_X1], and are further transformed by a+
−
    * (possibly non-linear) transformation function given by "pcal_type"+
−
    * and "pcal_params" into "pcal_units".  Please see the PNG_EQUATION_+
−
    * defines below, and the PNG-Group's PNG extensions document for a+
−
    * complete description of the transformations and how they should be+
−
    * implemented, and for a description of the ASCII parameter strings.+
−
    * Data values are valid if (valid & PNG_INFO_pCAL) non-zero.+
−
    */+
−
   png_charp pcal_purpose;  /* pCAL chunk description string */+
−
   png_int_32 pcal_X0;      /* minimum value */+
−
   png_int_32 pcal_X1;      /* maximum value */+
−
   png_charp pcal_units;    /* Latin-1 string giving physical units */+
−
   png_charpp pcal_params;  /* ASCII strings containing parameter values */+
−
   png_byte pcal_type;      /* equation type (see PNG_EQUATION_ below) */+
−
   png_byte pcal_nparams;   /* number of parameters given in pcal_params */+
−
#endif+
−
+
−
/* New members added in libpng-1.0.6 */+
−
#ifdef PNG_FREE_ME_SUPPORTED+
−
   png_uint_32 free_me;     /* flags items libpng is responsible for freeing */+
−
#endif+
−
+
−
#if defined(PNG_UNKNOWN_CHUNKS_SUPPORTED) || \+
−
 defined(PNG_HANDLE_AS_UNKNOWN_SUPPORTED)+
−
   /* Storage for unknown chunks that the library doesn't recognize. */+
−
   png_unknown_chunkp unknown_chunks;+
−
   png_size_t unknown_chunks_num;+
−
#endif+
−
+
−
#if defined(PNG_iCCP_SUPPORTED)+
−
   /* iCCP chunk data. */+
−
   png_charp iccp_name;     /* profile name */+
−
   png_charp iccp_profile;  /* International Color Consortium profile data */+
−
                            /* Note to maintainer: should be png_bytep */+
−
   png_uint_32 iccp_proflen;  /* ICC profile data length */+
−
   png_byte iccp_compression; /* Always zero */+
−
#endif+
−
+
−
#if defined(PNG_sPLT_SUPPORTED)+
−
   /* Data on sPLT chunks (there may be more than one). */+
−
   png_sPLT_tp splt_palettes;+
−
   png_uint_32 splt_palettes_num;+
−
#endif+
−
+
−
#if defined(PNG_sCAL_SUPPORTED)+
−
   /* The sCAL chunk describes the actual physical dimensions of the+
−
    * subject matter of the graphic.  The chunk contains a unit specification+
−
    * a byte value, and two ASCII strings representing floating-point+
−
    * values.  The values are width and height corresponsing to one pixel+
−
    * in the image.  This external representation is converted to double+
−
    * here.  Data values are valid if (valid & PNG_INFO_sCAL) is non-zero.+
−
    */+
−
   png_byte scal_unit;         /* unit of physical scale */+
−
#ifdef PNG_FLOATING_POINT_SUPPORTED+
−
   double scal_pixel_width;    /* width of one pixel */+
−
   double scal_pixel_height;   /* height of one pixel */+
−
#endif+
−
#ifdef PNG_FIXED_POINT_SUPPORTED+
−
   png_charp scal_s_width;     /* string containing height */+
−
   png_charp scal_s_height;    /* string containing width */+
−
#endif+
−
#endif+
−
+
−
#if defined(PNG_INFO_IMAGE_SUPPORTED)+
−
   /* Memory has been allocated if (valid & PNG_ALLOCATED_INFO_ROWS) non-zero */+
−
   /* Data valid if (valid & PNG_INFO_IDAT) non-zero */+
−
   png_bytepp row_pointers;        /* the image bits */+
−
#endif+
−
+
−
#if defined(PNG_FIXED_POINT_SUPPORTED) && defined(PNG_gAMA_SUPPORTED)+
−
   png_fixed_point int_gamma; /* gamma of image, if (valid & PNG_INFO_gAMA) */+
−
#endif+
−
+
−
#if defined(PNG_cHRM_SUPPORTED) && defined(PNG_FIXED_POINT_SUPPORTED)+
−
   png_fixed_point int_x_white;+
−
   png_fixed_point int_y_white;+
−
   png_fixed_point int_x_red;+
−
   png_fixed_point int_y_red;+
−
   png_fixed_point int_x_green;+
−
   png_fixed_point int_y_green;+
−
   png_fixed_point int_x_blue;+
−
   png_fixed_point int_y_blue;+
−
#endif+
−
+
−
} png_info;+
−
+
−
typedef png_info FAR * png_infop;+
−
typedef png_info FAR * FAR * png_infopp;+
−
+
−
/* Maximum positive integer used in PNG is (2^31)-1 */+
−
#define PNG_UINT_31_MAX ((png_uint_32)0x7fffffffL)+
−
#define PNG_UINT_32_MAX ((png_uint_32)(-1))+
−
#define PNG_SIZE_MAX ((png_size_t)(-1))+
−
#if defined(PNG_1_0_X) || defined (PNG_1_2_X)+
−
/* PNG_MAX_UINT is deprecated; use PNG_UINT_31_MAX instead. */+
−
#define PNG_MAX_UINT PNG_UINT_31_MAX+
−
#endif+
−
+
−
/* These describe the color_type field in png_info. */+
−
/* color type masks */+
−
#define PNG_COLOR_MASK_PALETTE    1+
−
#define PNG_COLOR_MASK_COLOR      2+
−
#define PNG_COLOR_MASK_ALPHA      4+
−
+
−
/* color types.  Note that not all combinations are legal */+
−
#define PNG_COLOR_TYPE_GRAY 0+
−
#define PNG_COLOR_TYPE_PALETTE  (PNG_COLOR_MASK_COLOR | PNG_COLOR_MASK_PALETTE)+
−
#define PNG_COLOR_TYPE_RGB        (PNG_COLOR_MASK_COLOR)+
−
#define PNG_COLOR_TYPE_RGB_ALPHA  (PNG_COLOR_MASK_COLOR | PNG_COLOR_MASK_ALPHA)+
−
#define PNG_COLOR_TYPE_GRAY_ALPHA (PNG_COLOR_MASK_ALPHA)+
−
/* aliases */+
−
#define PNG_COLOR_TYPE_RGBA  PNG_COLOR_TYPE_RGB_ALPHA+
−
#define PNG_COLOR_TYPE_GA  PNG_COLOR_TYPE_GRAY_ALPHA+
−
+
−
/* This is for compression type. PNG 1.0-1.2 only define the single type. */+
−
#define PNG_COMPRESSION_TYPE_BASE 0 /* Deflate method 8, 32K window */+
−
#define PNG_COMPRESSION_TYPE_DEFAULT PNG_COMPRESSION_TYPE_BASE+
−
+
−
/* This is for filter type. PNG 1.0-1.2 only define the single type. */+
−
#define PNG_FILTER_TYPE_BASE      0 /* Single row per-byte filtering */+
−
#define PNG_INTRAPIXEL_DIFFERENCING 64 /* Used only in MNG datastreams */+
−
#define PNG_FILTER_TYPE_DEFAULT   PNG_FILTER_TYPE_BASE+
−
+
−
/* These are for the interlacing type.  These values should NOT be changed. */+
−
#define PNG_INTERLACE_NONE        0 /* Non-interlaced image */+
−
#define PNG_INTERLACE_ADAM7       1 /* Adam7 interlacing */+
−
#define PNG_INTERLACE_LAST        2 /* Not a valid value */+
−
+
−
/* These are for the oFFs chunk.  These values should NOT be changed. */+
−
#define PNG_OFFSET_PIXEL          0 /* Offset in pixels */+
−
#define PNG_OFFSET_MICROMETER     1 /* Offset in micrometers (1/10^6 meter) */+
−
#define PNG_OFFSET_LAST           2 /* Not a valid value */+
−
+
−
/* These are for the pCAL chunk.  These values should NOT be changed. */+
−
#define PNG_EQUATION_LINEAR       0 /* Linear transformation */+
−
#define PNG_EQUATION_BASE_E       1 /* Exponential base e transform */+
−
#define PNG_EQUATION_ARBITRARY    2 /* Arbitrary base exponential transform */+
−
#define PNG_EQUATION_HYPERBOLIC   3 /* Hyperbolic sine transformation */+
−
#define PNG_EQUATION_LAST         4 /* Not a valid value */+
−
+
−
/* These are for the sCAL chunk.  These values should NOT be changed. */+
−
#define PNG_SCALE_UNKNOWN         0 /* unknown unit (image scale) */+
−
#define PNG_SCALE_METER           1 /* meters per pixel */+
−
#define PNG_SCALE_RADIAN          2 /* radians per pixel */+
−
#define PNG_SCALE_LAST            3 /* Not a valid value */+
−
+
−
/* These are for the pHYs chunk.  These values should NOT be changed. */+
−
#define PNG_RESOLUTION_UNKNOWN    0 /* pixels/unknown unit (aspect ratio) */+
−
#define PNG_RESOLUTION_METER      1 /* pixels/meter */+
−
#define PNG_RESOLUTION_LAST       2 /* Not a valid value */+
−
+
−
/* These are for the sRGB chunk.  These values should NOT be changed. */+
−
#define PNG_sRGB_INTENT_PERCEPTUAL 0+
−
#define PNG_sRGB_INTENT_RELATIVE   1+
−
#define PNG_sRGB_INTENT_SATURATION 2+
−
#define PNG_sRGB_INTENT_ABSOLUTE   3+
−
#define PNG_sRGB_INTENT_LAST       4 /* Not a valid value */+
−
+
−
/* This is for text chunks */+
−
#define PNG_KEYWORD_MAX_LENGTH     79+
−
+
−
/* Maximum number of entries in PLTE/sPLT/tRNS arrays */+
−
#define PNG_MAX_PALETTE_LENGTH    256+
−
+
−
/* These determine if an ancillary chunk's data has been successfully read+
−
 * from the PNG header, or if the application has filled in the corresponding+
−
 * data in the info_struct to be written into the output file.  The values+
−
 * of the PNG_INFO_<chunk> defines should NOT be changed.+
−
 */+
−
#define PNG_INFO_gAMA 0x0001+
−
#define PNG_INFO_sBIT 0x0002+
−
#define PNG_INFO_cHRM 0x0004+
−
#define PNG_INFO_PLTE 0x0008+
−
#define PNG_INFO_tRNS 0x0010+
−
#define PNG_INFO_bKGD 0x0020+
−
#define PNG_INFO_hIST 0x0040+
−
#define PNG_INFO_pHYs 0x0080+
−
#define PNG_INFO_oFFs 0x0100+
−
#define PNG_INFO_tIME 0x0200+
−
#define PNG_INFO_pCAL 0x0400+
−
#define PNG_INFO_sRGB 0x0800   /* GR-P, 0.96a */+
−
#define PNG_INFO_iCCP 0x1000   /* ESR, 1.0.6 */+
−
#define PNG_INFO_sPLT 0x2000   /* ESR, 1.0.6 */+
−
#define PNG_INFO_sCAL 0x4000   /* ESR, 1.0.6 */+
−
#define PNG_INFO_IDAT 0x8000L  /* ESR, 1.0.6 */+
−
+
−
/* This is used for the transformation routines, as some of them+
−
 * change these values for the row.  It also should enable using+
−
 * the routines for other purposes.+
−
 */+
−
typedef struct png_row_info_struct+
−
{+
−
   png_uint_32 width; /* width of row */+
−
   png_uint_32 rowbytes; /* number of bytes in row */+
−
   png_byte color_type; /* color type of row */+
−
   png_byte bit_depth; /* bit depth of row */+
−
   png_byte channels; /* number of channels (1, 2, 3, or 4) */+
−
   png_byte pixel_depth; /* bits per pixel (depth * channels) */+
−
} png_row_info;+
−
+
−
typedef png_row_info FAR * png_row_infop;+
−
typedef png_row_info FAR * FAR * png_row_infopp;+
−
+
−
/* These are the function types for the I/O functions and for the functions+
−
 * that allow the user to override the default I/O functions with his or her+
−
 * own.  The png_error_ptr type should match that of user-supplied warning+
−
 * and error functions, while the png_rw_ptr type should match that of the+
−
 * user read/write data functions.+
−
 */+
−
typedef struct png_struct_def png_struct;+
−
typedef png_struct FAR * png_structp;+
−
+
−
typedef void (PNGAPI *png_error_ptr) PNGARG((png_structp, png_const_charp));+
−
typedef void (PNGAPI *png_rw_ptr) PNGARG((png_structp, png_bytep, png_size_t));+
−
typedef void (PNGAPI *png_flush_ptr) PNGARG((png_structp));+
−
typedef void (PNGAPI *png_read_status_ptr) PNGARG((png_structp, png_uint_32,+
−
   int));+
−
typedef void (PNGAPI *png_write_status_ptr) PNGARG((png_structp, png_uint_32,+
−
   int));+
−
+
−
#ifdef PNG_PROGRESSIVE_READ_SUPPORTED+
−
typedef void (PNGAPI *png_progressive_info_ptr) PNGARG((png_structp, png_infop));+
−
typedef void (PNGAPI *png_progressive_end_ptr) PNGARG((png_structp, png_infop));+
−
typedef void (PNGAPI *png_progressive_row_ptr) PNGARG((png_structp, png_bytep,+
−
   png_uint_32, int));+
−
#endif+
−
+
−
#if defined(PNG_READ_USER_TRANSFORM_SUPPORTED) || \+
−
    defined(PNG_WRITE_USER_TRANSFORM_SUPPORTED) || \+
−
    defined(PNG_LEGACY_SUPPORTED)+
−
typedef void (PNGAPI *png_user_transform_ptr) PNGARG((png_structp,+
−
    png_row_infop, png_bytep));+
−
#endif+
−
+
−
#if defined(PNG_USER_CHUNKS_SUPPORTED)+
−
typedef int (PNGAPI *png_user_chunk_ptr) PNGARG((png_structp, png_unknown_chunkp));+
−
#endif+
−
#if defined(PNG_UNKNOWN_CHUNKS_SUPPORTED)+
−
typedef void (PNGAPI *png_unknown_chunk_ptr) PNGARG((png_structp));+
−
#endif+
−
+
−
/* Transform masks for the high-level interface */+
−
#define PNG_TRANSFORM_IDENTITY       0x0000    /* read and write */+
−
#define PNG_TRANSFORM_STRIP_16       0x0001    /* read only */+
−
#define PNG_TRANSFORM_STRIP_ALPHA    0x0002    /* read only */+
−
#define PNG_TRANSFORM_PACKING        0x0004    /* read and write */+
−
#define PNG_TRANSFORM_PACKSWAP       0x0008    /* read and write */+
−
#define PNG_TRANSFORM_EXPAND         0x0010    /* read only */+
−
#define PNG_TRANSFORM_INVERT_MONO    0x0020    /* read and write */+
−
#define PNG_TRANSFORM_SHIFT          0x0040    /* read and write */+
−
#define PNG_TRANSFORM_BGR            0x0080    /* read and write */+
−
#define PNG_TRANSFORM_SWAP_ALPHA     0x0100    /* read and write */+
−
#define PNG_TRANSFORM_SWAP_ENDIAN    0x0200    /* read and write */+
−
#define PNG_TRANSFORM_INVERT_ALPHA   0x0400    /* read and write */+
−
#define PNG_TRANSFORM_STRIP_FILLER   0x0800    /* write only, deprecated */+
−
/* Added to libpng-1.2.34 */+
−
#define PNG_TRANSFORM_STRIP_FILLER_BEFORE 0x0800  /* write only */+
−
#define PNG_TRANSFORM_STRIP_FILLER_AFTER  0x1000  /* write only */+
−
+
−
/* Flags for MNG supported features */+
−
#define PNG_FLAG_MNG_EMPTY_PLTE     0x01+
−
#define PNG_FLAG_MNG_FILTER_64      0x04+
−
#define PNG_ALL_MNG_FEATURES        0x05+
−
+
−
typedef png_voidp (*png_malloc_ptr) PNGARG((png_structp, png_size_t));+
−
typedef void (*png_free_ptr) PNGARG((png_structp, png_voidp));+
−
+
−
/* The structure that holds the information to read and write PNG files.+
−
 * The only people who need to care about what is inside of this are the+
−
 * people who will be modifying the library for their own special needs.+
−
 * It should NOT be accessed directly by an application, except to store+
−
 * the jmp_buf.+
−
 */+
−
+
−
struct png_struct_def+
−
{+
−
#ifdef PNG_SETJMP_SUPPORTED+
−
   jmp_buf jmpbuf;            /* used in png_error */+
−
#endif+
−
   png_error_ptr error_fn;    /* function for printing errors and aborting */+
−
   png_error_ptr warning_fn;  /* function for printing warnings */+
−
   png_voidp error_ptr;       /* user supplied struct for error functions */+
−
   png_rw_ptr write_data_fn;  /* function for writing output data */+
−
   png_rw_ptr read_data_fn;   /* function for reading input data */+
−
   png_voidp io_ptr;          /* ptr to application struct for I/O functions */+
−
+
−
#if defined(PNG_READ_USER_TRANSFORM_SUPPORTED)+
−
   png_user_transform_ptr read_user_transform_fn; /* user read transform */+
−
#endif+
−
+
−
#if defined(PNG_WRITE_USER_TRANSFORM_SUPPORTED)+
−
   png_user_transform_ptr write_user_transform_fn; /* user write transform */+
−
#endif+
−
+
−
/* These were added in libpng-1.0.2 */+
−
#if defined(PNG_USER_TRANSFORM_PTR_SUPPORTED)+
−
#if defined(PNG_READ_USER_TRANSFORM_SUPPORTED) || \+
−
    defined(PNG_WRITE_USER_TRANSFORM_SUPPORTED)+
−
   png_voidp user_transform_ptr; /* user supplied struct for user transform */+
−
   png_byte user_transform_depth;    /* bit depth of user transformed pixels */+
−
   png_byte user_transform_channels; /* channels in user transformed pixels */+
−
#endif+
−
#endif+
−
+
−
   png_uint_32 mode;          /* tells us where we are in the PNG file */+
−
   png_uint_32 flags;         /* flags indicating various things to libpng */+
−
   png_uint_32 transformations; /* which transformations to perform */+
−
+
−
   z_stream zstream;          /* pointer to decompression structure (below) */+
−
   png_bytep zbuf;            /* buffer for zlib */+
−
   png_size_t zbuf_size;      /* size of zbuf */+
−
   int zlib_level;            /* holds zlib compression level */+
−
   int zlib_method;           /* holds zlib compression method */+
−
   int zlib_window_bits;      /* holds zlib compression window bits */+
−
   int zlib_mem_level;        /* holds zlib compression memory level */+
−
   int zlib_strategy;         /* holds zlib compression strategy */+
−
+
−
   png_uint_32 width;         /* width of image in pixels */+
−
   png_uint_32 height;        /* height of image in pixels */+
−
   png_uint_32 num_rows;      /* number of rows in current pass */+
−
   png_uint_32 usr_width;     /* width of row at start of write */+
−
   png_uint_32 rowbytes;      /* size of row in bytes */+
−
   png_uint_32 irowbytes;     /* size of current interlaced row in bytes */+
−
   png_uint_32 iwidth;        /* width of current interlaced row in pixels */+
−
   png_uint_32 row_number;    /* current row in interlace pass */+
−
   png_bytep prev_row;        /* buffer to save previous (unfiltered) row */+
−
   png_bytep row_buf;         /* buffer to save current (unfiltered) row */+
−
#ifndef PNG_NO_WRITE_FILTER+
−
   png_bytep sub_row;         /* buffer to save "sub" row when filtering */+
−
   png_bytep up_row;          /* buffer to save "up" row when filtering */+
−
   png_bytep avg_row;         /* buffer to save "avg" row when filtering */+
−
   png_bytep paeth_row;       /* buffer to save "Paeth" row when filtering */+
−
#endif+
−
   png_row_info row_info;     /* used for transformation routines */+
−
+
−
   png_uint_32 idat_size;     /* current IDAT size for read */+
−
   png_uint_32 crc;           /* current chunk CRC value */+
−
   png_colorp palette;        /* palette from the input file */+
−
   png_uint_16 num_palette;   /* number of color entries in palette */+
−
   png_uint_16 num_trans;     /* number of transparency values */+
−
   png_byte chunk_name[5];    /* null-terminated name of current chunk */+
−
   png_byte compression;      /* file compression type (always 0) */+
−
   png_byte filter;           /* file filter type (always 0) */+
−
   png_byte interlaced;       /* PNG_INTERLACE_NONE, PNG_INTERLACE_ADAM7 */+
−
   png_byte pass;             /* current interlace pass (0 - 6) */+
−
   png_byte do_filter;        /* row filter flags (see PNG_FILTER_ below ) */+
−
   png_byte color_type;       /* color type of file */+
−
   png_byte bit_depth;        /* bit depth of file */+
−
   png_byte usr_bit_depth;    /* bit depth of users row */+
−
   png_byte pixel_depth;      /* number of bits per pixel */+
−
   png_byte channels;         /* number of channels in file */+
−
   png_byte usr_channels;     /* channels at start of write */+
−
   png_byte sig_bytes;        /* magic bytes read/written from start of file */+
−
+
−
#if defined(PNG_READ_FILLER_SUPPORTED) || defined(PNG_WRITE_FILLER_SUPPORTED)+
−
#ifdef PNG_LEGACY_SUPPORTED+
−
   png_byte filler;           /* filler byte for pixel expansion */+
−
#else+
−
   png_uint_16 filler;           /* filler bytes for pixel expansion */+
−
#endif+
−
#endif+
−
+
−
#if defined(PNG_bKGD_SUPPORTED)+
−
   png_byte background_gamma_type;+
−
#  ifdef PNG_FLOATING_POINT_SUPPORTED+
−
   float background_gamma;+
−
#  endif+
−
   png_color_16 background;   /* background color in screen gamma space */+
−
#if defined(PNG_READ_GAMMA_SUPPORTED)+
−
   png_color_16 background_1; /* background normalized to gamma 1.0 */+
−
#endif+
−
#endif /* PNG_bKGD_SUPPORTED */+
−
+
−
#if defined(PNG_WRITE_FLUSH_SUPPORTED)+
−
   png_flush_ptr output_flush_fn; /* Function for flushing output */+
−
   png_uint_32 flush_dist;    /* how many rows apart to flush, 0 - no flush */+
−
   png_uint_32 flush_rows;    /* number of rows written since last flush */+
−
#endif+
−
+
−
#if defined(PNG_READ_GAMMA_SUPPORTED) || defined(PNG_READ_BACKGROUND_SUPPORTED)+
−
   int gamma_shift;      /* number of "insignificant" bits 16-bit gamma */+
−
#ifdef PNG_FLOATING_POINT_SUPPORTED+
−
   float gamma;          /* file gamma value */+
−
   float screen_gamma;   /* screen gamma value (display_exponent) */+
−
#endif+
−
#endif+
−
+
−
#if defined(PNG_READ_GAMMA_SUPPORTED) || defined(PNG_READ_BACKGROUND_SUPPORTED)+
−
   png_bytep gamma_table;     /* gamma table for 8-bit depth files */+
−
   png_bytep gamma_from_1;    /* converts from 1.0 to screen */+
−
   png_bytep gamma_to_1;      /* converts from file to 1.0 */+
−
   png_uint_16pp gamma_16_table; /* gamma table for 16-bit depth files */+
−
   png_uint_16pp gamma_16_from_1; /* converts from 1.0 to screen */+
−
   png_uint_16pp gamma_16_to_1; /* converts from file to 1.0 */+
−
#endif+
−
+
−
#if defined(PNG_READ_GAMMA_SUPPORTED) || defined(PNG_sBIT_SUPPORTED)+
−
   png_color_8 sig_bit;       /* significant bits in each available channel */+
−
#endif+
−
+
−
#if defined(PNG_READ_SHIFT_SUPPORTED) || defined(PNG_WRITE_SHIFT_SUPPORTED)+
−
   png_color_8 shift;         /* shift for significant bit tranformation */+
−
#endif+
−
+
−
#if defined(PNG_tRNS_SUPPORTED) || defined(PNG_READ_BACKGROUND_SUPPORTED) \+
−
 || defined(PNG_READ_EXPAND_SUPPORTED) || defined(PNG_READ_BACKGROUND_SUPPORTED)+
−
   png_bytep trans;           /* transparency values for paletted files */+
−
   png_color_16 trans_values; /* transparency values for non-paletted files */+
−
#endif+
−
+
−
   png_read_status_ptr read_row_fn;   /* called after each row is decoded */+
−
   png_write_status_ptr write_row_fn; /* called after each row is encoded */+
−
#ifdef PNG_PROGRESSIVE_READ_SUPPORTED+
−
   png_progressive_info_ptr info_fn; /* called after header data fully read */+
−
   png_progressive_row_ptr row_fn;   /* called after each prog. row is decoded */+
−
   png_progressive_end_ptr end_fn;   /* called after image is complete */+
−
   png_bytep save_buffer_ptr;        /* current location in save_buffer */+
−
   png_bytep save_buffer;            /* buffer for previously read data */+
−
   png_bytep current_buffer_ptr;     /* current location in current_buffer */+
−
   png_bytep current_buffer;         /* buffer for recently used data */+
−
   png_uint_32 push_length;          /* size of current input chunk */+
−
   png_uint_32 skip_length;          /* bytes to skip in input data */+
−
   png_size_t save_buffer_size;      /* amount of data now in save_buffer */+
−
   png_size_t save_buffer_max;       /* total size of save_buffer */+
−
   png_size_t buffer_size;           /* total amount of available input data */+
−
   png_size_t current_buffer_size;   /* amount of data now in current_buffer */+
−
   int process_mode;                 /* what push library is currently doing */+
−
   int cur_palette;                  /* current push library palette index */+
−
+
−
#  if defined(PNG_TEXT_SUPPORTED)+
−
     png_size_t current_text_size;   /* current size of text input data */+
−
     png_size_t current_text_left;   /* how much text left to read in input */+
−
     png_charp current_text;         /* current text chunk buffer */+
−
     png_charp current_text_ptr;     /* current location in current_text */+
−
#  endif /* PNG_TEXT_SUPPORTED */+
−
#endif /* PNG_PROGRESSIVE_READ_SUPPORTED */+
−
+
−
#if defined(__TURBOC__) && !defined(_Windows) && !defined(__FLAT__)+
−
/* for the Borland special 64K segment handler */+
−
   png_bytepp offset_table_ptr;+
−
   png_bytep offset_table;+
−
   png_uint_16 offset_table_number;+
−
   png_uint_16 offset_table_count;+
−
   png_uint_16 offset_table_count_free;+
−
#endif+
−
+
−
#if defined(PNG_READ_DITHER_SUPPORTED)+
−
   png_bytep palette_lookup;         /* lookup table for dithering */+
−
   png_bytep dither_index;           /* index translation for palette files */+
−
#endif+
−
+
−
#if defined(PNG_READ_DITHER_SUPPORTED) || defined(PNG_hIST_SUPPORTED)+
−
   png_uint_16p hist;                /* histogram */+
−
#endif+
−
+
−
#if defined(PNG_WRITE_WEIGHTED_FILTER_SUPPORTED)+
−
   png_byte heuristic_method;        /* heuristic for row filter selection */+
−
   png_byte num_prev_filters;        /* number of weights for previous rows */+
−
   png_bytep prev_filters;           /* filter type(s) of previous row(s) */+
−
   png_uint_16p filter_weights;      /* weight(s) for previous line(s) */+
−
   png_uint_16p inv_filter_weights;  /* 1/weight(s) for previous line(s) */+
−
   png_uint_16p filter_costs;        /* relative filter calculation cost */+
−
   png_uint_16p inv_filter_costs;    /* 1/relative filter calculation cost */+
−
#endif+
−
+
−
#if defined(PNG_TIME_RFC1123_SUPPORTED)+
−
   png_charp time_buffer;            /* String to hold RFC 1123 time text */+
−
#endif+
−
+
−
/* New members added in libpng-1.0.6 */+
−
+
−
#ifdef PNG_FREE_ME_SUPPORTED+
−
   png_uint_32 free_me;   /* flags items libpng is responsible for freeing */+
−
#endif+
−
+
−
#if defined(PNG_USER_CHUNKS_SUPPORTED)+
−
   png_voidp user_chunk_ptr;+
−
   png_user_chunk_ptr read_user_chunk_fn; /* user read chunk handler */+
−
#endif+
−
+
−
#ifdef PNG_HANDLE_AS_UNKNOWN_SUPPORTED+
−
   int num_chunk_list;+
−
   png_bytep chunk_list;+
−
#endif+
−
+
−
/* New members added in libpng-1.0.3 */+
−
#if defined(PNG_READ_RGB_TO_GRAY_SUPPORTED)+
−
   png_byte rgb_to_gray_status;+
−
   /* These were changed from png_byte in libpng-1.0.6 */+
−
   png_uint_16 rgb_to_gray_red_coeff;+
−
   png_uint_16 rgb_to_gray_green_coeff;+
−
   png_uint_16 rgb_to_gray_blue_coeff;+
−
#endif+
−
+
−
/* New member added in libpng-1.0.4 (renamed in 1.0.9) */+
−
#if defined(PNG_MNG_FEATURES_SUPPORTED) || \+
−
    defined(PNG_READ_EMPTY_PLTE_SUPPORTED) || \+
−
    defined(PNG_WRITE_EMPTY_PLTE_SUPPORTED)+
−
/* Changed from png_byte to png_uint_32 at version 1.2.0 */+
−
#ifdef PNG_1_0_X+
−
   png_byte mng_features_permitted;+
−
#else+
−
   png_uint_32 mng_features_permitted;+
−
#endif /* PNG_1_0_X */+
−
#endif+
−
+
−
/* New member added in libpng-1.0.7 */+
−
#if defined(PNG_READ_GAMMA_SUPPORTED) || defined(PNG_READ_BACKGROUND_SUPPORTED)+
−
   png_fixed_point int_gamma;+
−
#endif+
−
+
−
/* New member added in libpng-1.0.9, ifdef'ed out in 1.0.12, enabled in 1.2.0 */+
−
#if defined(PNG_MNG_FEATURES_SUPPORTED)+
−
   png_byte filter_type;+
−
#endif+
−
+
−
#if defined(PNG_1_0_X)+
−
/* New member added in libpng-1.0.10, ifdef'ed out in 1.2.0 */+
−
   png_uint_32 row_buf_size;+
−
#endif+
−
+
−
/* New members added in libpng-1.2.0 */+
−
#if defined(PNG_ASSEMBLER_CODE_SUPPORTED)+
−
#  if !defined(PNG_1_0_X)+
−
#    if defined(PNG_MMX_CODE_SUPPORTED)+
−
   png_byte     mmx_bitdepth_threshold;+
−
   png_uint_32  mmx_rowbytes_threshold;+
−
#    endif+
−
   png_uint_32  asm_flags;+
−
#  endif+
−
#endif+
−
+
−
/* New members added in libpng-1.0.2 but first enabled by default in 1.2.0 */+
−
#ifdef PNG_USER_MEM_SUPPORTED+
−
   png_voidp mem_ptr;            /* user supplied struct for mem functions */+
−
   png_malloc_ptr malloc_fn;     /* function for allocating memory */+
−
   png_free_ptr free_fn;         /* function for freeing memory */+
−
#endif+
−
+
−
/* New member added in libpng-1.0.13 and 1.2.0 */+
−
   png_bytep big_row_buf;        /* buffer to save current (unfiltered) row */+
−
+
−
#if defined(PNG_READ_DITHER_SUPPORTED)+
−
/* The following three members were added at version 1.0.14 and 1.2.4 */+
−
   png_bytep dither_sort;        /* working sort array */+
−
   png_bytep index_to_palette;   /* where the original index currently is */+
−
                                 /* in the palette */+
−
   png_bytep palette_to_index;   /* which original index points to this */+
−
                                 /* palette color */+
−
#endif+
−
+
−
/* New members added in libpng-1.0.16 and 1.2.6 */+
−
   png_byte compression_type;+
−
+
−
#ifdef PNG_SET_USER_LIMITS_SUPPORTED+
−
   png_uint_32 user_width_max;+
−
   png_uint_32 user_height_max;+
−
#endif+
−
+
−
/* New member added in libpng-1.0.25 and 1.2.17 */+
−
#if defined(PNG_UNKNOWN_CHUNKS_SUPPORTED)+
−
   /* Storage for unknown chunk that the library doesn't recognize. */+
−
   png_unknown_chunk unknown_chunk;+
−
#endif+
−
+
−
/* New members added in libpng-1.2.26 */+
−
  png_uint_32 old_big_row_buf_size, old_prev_row_size;+
−
+
−
/* New member added in libpng-1.2.30 */+
−
  png_charp chunkdata;  /* buffer for reading chunk data */+
−
+
−
};+
−
+
−
+
−
/* This triggers a compiler error in png.c, if png.c and png.h+
−
 * do not agree upon the version number.+
−
 */+
−
typedef png_structp version_1_2_40;+
−
+
−
typedef png_struct FAR * FAR * png_structpp;+
−
+
−
/* Here are the function definitions most commonly used.  This is not+
−
 * the place to find out how to use libpng.  See libpng.txt for the+
−
 * full explanation, see example.c for the summary.  This just provides+
−
 * a simple one line description of the use of each function.+
−
 */+
−
+
−
/* Returns the version number of the library */+
−
extern PNG_EXPORT(png_uint_32,png_access_version_number) PNGARG((void));+
−
+
−
/* Tell lib we have already handled the first <num_bytes> magic bytes.+
−
 * Handling more than 8 bytes from the beginning of the file is an error.+
−
 */+
−
extern PNG_EXPORT(void,png_set_sig_bytes) PNGARG((png_structp png_ptr,+
−
   int num_bytes));+
−
+
−
/* Check sig[start] through sig[start + num_to_check - 1] to see if it's a+
−
 * PNG file.  Returns zero if the supplied bytes match the 8-byte PNG+
−
 * signature, and non-zero otherwise.  Having num_to_check == 0 or+
−
 * start > 7 will always fail (ie return non-zero).+
−
 */+
−
extern PNG_EXPORT(int,png_sig_cmp) PNGARG((png_bytep sig, png_size_t start,+
−
   png_size_t num_to_check));+
−
+
−
/* Simple signature checking function.  This is the same as calling+
−
 * png_check_sig(sig, n) := !png_sig_cmp(sig, 0, n).+
−
 */+
−
extern PNG_EXPORT(int,png_check_sig) PNGARG((png_bytep sig, int num));+
−
+
−
/* Allocate and initialize png_ptr struct for reading, and any other memory. */+
−
extern PNG_EXPORT(png_structp,png_create_read_struct)+
−
   PNGARG((png_const_charp user_png_ver, png_voidp error_ptr,+
−
   png_error_ptr error_fn, png_error_ptr warn_fn));+
−
+
−
/* Allocate and initialize png_ptr struct for writing, and any other memory */+
−
extern PNG_EXPORT(png_structp,png_create_write_struct)+
−
   PNGARG((png_const_charp user_png_ver, png_voidp error_ptr,+
−
   png_error_ptr error_fn, png_error_ptr warn_fn));+
−
+
−
#ifdef PNG_WRITE_SUPPORTED+
−
extern PNG_EXPORT(png_uint_32,png_get_compression_buffer_size)+
−
   PNGARG((png_structp png_ptr));+
−
#endif+
−
+
−
#ifdef PNG_WRITE_SUPPORTED+
−
extern PNG_EXPORT(void,png_set_compression_buffer_size)+
−
   PNGARG((png_structp png_ptr, png_uint_32 size));+
−
#endif+
−
+
−
/* Reset the compression stream */+
−
extern PNG_EXPORT(int,png_reset_zstream) PNGARG((png_structp png_ptr));+
−
+
−
/* New functions added in libpng-1.0.2 (not enabled by default until 1.2.0) */+
−
#ifdef PNG_USER_MEM_SUPPORTED+
−
extern PNG_EXPORT(png_structp,png_create_read_struct_2)+
−
   PNGARG((png_const_charp user_png_ver, png_voidp error_ptr,+
−
   png_error_ptr error_fn, png_error_ptr warn_fn, png_voidp mem_ptr,+
−
   png_malloc_ptr malloc_fn, png_free_ptr free_fn));+
−
extern PNG_EXPORT(png_structp,png_create_write_struct_2)+
−
   PNGARG((png_const_charp user_png_ver, png_voidp error_ptr,+
−
   png_error_ptr error_fn, png_error_ptr warn_fn, png_voidp mem_ptr,+
−
   png_malloc_ptr malloc_fn, png_free_ptr free_fn));+
−
#endif+
−
+
−
/* Write a PNG chunk - size, type, (optional) data, CRC. */+
−
extern PNG_EXPORT(void,png_write_chunk) PNGARG((png_structp png_ptr,+
−
   png_bytep chunk_name, png_bytep data, png_size_t length));+
−
+
−
/* Write the start of a PNG chunk - length and chunk name. */+
−
extern PNG_EXPORT(void,png_write_chunk_start) PNGARG((png_structp png_ptr,+
−
   png_bytep chunk_name, png_uint_32 length));+
−
+
−
/* Write the data of a PNG chunk started with png_write_chunk_start(). */+
−
extern PNG_EXPORT(void,png_write_chunk_data) PNGARG((png_structp png_ptr,+
−
   png_bytep data, png_size_t length));+
−
+
−
/* Finish a chunk started with png_write_chunk_start() (includes CRC). */+
−
extern PNG_EXPORT(void,png_write_chunk_end) PNGARG((png_structp png_ptr));+
−
+
−
/* Allocate and initialize the info structure */+
−
extern PNG_EXPORT(png_infop,png_create_info_struct)+
−
   PNGARG((png_structp png_ptr));+
−
+
−
#if defined(PNG_1_0_X) || defined (PNG_1_2_X)+
−
/* Initialize the info structure (old interface - DEPRECATED) */+
−
extern PNG_EXPORT(void,png_info_init) PNGARG((png_infop info_ptr));+
−
#undef png_info_init+
−
#define png_info_init(info_ptr) png_info_init_3(&info_ptr,\+
−
    png_sizeof(png_info));+
−
#endif+
−
+
−
extern PNG_EXPORT(void,png_info_init_3) PNGARG((png_infopp info_ptr,+
−
    png_size_t png_info_struct_size));+
−
+
−
/* Writes all the PNG information before the image. */+
−
extern PNG_EXPORT(void,png_write_info_before_PLTE) PNGARG((png_structp png_ptr,+
−
   png_infop info_ptr));+
−
extern PNG_EXPORT(void,png_write_info) PNGARG((png_structp png_ptr,+
−
   png_infop info_ptr));+
−
+
−
#ifndef PNG_NO_SEQUENTIAL_READ_SUPPORTED+
−
/* Read the information before the actual image data. */+
−
extern PNG_EXPORT(void,png_read_info) PNGARG((png_structp png_ptr,+
−
   png_infop info_ptr));+
−
#endif+
−
+
−
#if defined(PNG_TIME_RFC1123_SUPPORTED)+
−
extern PNG_EXPORT(png_charp,png_convert_to_rfc1123)+
−
   PNGARG((png_structp png_ptr, png_timep ptime));+
−
#endif+
−
+
−
#if !defined(_WIN32_WCE)+
−
/* "time.h" functions are not supported on WindowsCE */+
−
#if defined(PNG_WRITE_tIME_SUPPORTED)+
−
/* Convert from a struct tm to png_time */+
−
extern PNG_EXPORT(void,png_convert_from_struct_tm) PNGARG((png_timep ptime,+
−
   struct tm FAR * ttime));+
−
+
−
/* Convert from time_t to png_time.  Uses gmtime() */+
−
extern PNG_EXPORT(void,png_convert_from_time_t) PNGARG((png_timep ptime,+
−
   time_t ttime));+
−
#endif /* PNG_WRITE_tIME_SUPPORTED */+
−
#endif /* _WIN32_WCE */+
−
+
−
#if defined(PNG_READ_EXPAND_SUPPORTED)+
−
/* Expand data to 24-bit RGB, or 8-bit grayscale, with alpha if available. */+
−
extern PNG_EXPORT(void,png_set_expand) PNGARG((png_structp png_ptr));+
−
#if !defined(PNG_1_0_X)+
−
extern PNG_EXPORT(void,png_set_expand_gray_1_2_4_to_8) PNGARG((png_structp+
−
  png_ptr));+
−
#endif+
−
extern PNG_EXPORT(void,png_set_palette_to_rgb) PNGARG((png_structp png_ptr));+
−
extern PNG_EXPORT(void,png_set_tRNS_to_alpha) PNGARG((png_structp png_ptr));+
−
#if defined(PNG_1_0_X) || defined (PNG_1_2_X)+
−
/* Deprecated */+
−
extern PNG_EXPORT(void,png_set_gray_1_2_4_to_8) PNGARG((png_structp png_ptr));+
−
#endif+
−
#endif+
−
+
−
#if defined(PNG_READ_BGR_SUPPORTED) || defined(PNG_WRITE_BGR_SUPPORTED)+
−
/* Use blue, green, red order for pixels. */+
−
extern PNG_EXPORT(void,png_set_bgr) PNGARG((png_structp png_ptr));+
−
#endif+
−
+
−
#if defined(PNG_READ_GRAY_TO_RGB_SUPPORTED)+
−
/* Expand the grayscale to 24-bit RGB if necessary. */+
−
extern PNG_EXPORT(void,png_set_gray_to_rgb) PNGARG((png_structp png_ptr));+
−
#endif+
−
+
−
#if defined(PNG_READ_RGB_TO_GRAY_SUPPORTED)+
−
/* Reduce RGB to grayscale. */+
−
#ifdef PNG_FLOATING_POINT_SUPPORTED+
−
extern PNG_EXPORT(void,png_set_rgb_to_gray) PNGARG((png_structp png_ptr,+
−
   int error_action, double red, double green ));+
−
#endif+
−
extern PNG_EXPORT(void,png_set_rgb_to_gray_fixed) PNGARG((png_structp png_ptr,+
−
   int error_action, png_fixed_point red, png_fixed_point green ));+
−
extern PNG_EXPORT(png_byte,png_get_rgb_to_gray_status) PNGARG((png_structp+
−
   png_ptr));+
−
#endif+
−
+
−
extern PNG_EXPORT(void,png_build_grayscale_palette) PNGARG((int bit_depth,+
−
   png_colorp palette));+
−
+
−
#if defined(PNG_READ_STRIP_ALPHA_SUPPORTED)+
−
extern PNG_EXPORT(void,png_set_strip_alpha) PNGARG((png_structp png_ptr));+
−
#endif+
−
+
−
#if defined(PNG_READ_SWAP_ALPHA_SUPPORTED) || \+
−
    defined(PNG_WRITE_SWAP_ALPHA_SUPPORTED)+
−
extern PNG_EXPORT(void,png_set_swap_alpha) PNGARG((png_structp png_ptr));+
−
#endif+
−
+
−
#if defined(PNG_READ_INVERT_ALPHA_SUPPORTED) || \+
−
    defined(PNG_WRITE_INVERT_ALPHA_SUPPORTED)+
−
extern PNG_EXPORT(void,png_set_invert_alpha) PNGARG((png_structp png_ptr));+
−
#endif+
−
+
−
#if defined(PNG_READ_FILLER_SUPPORTED) || defined(PNG_WRITE_FILLER_SUPPORTED)+
−
/* Add a filler byte to 8-bit Gray or 24-bit RGB images. */+
−
extern PNG_EXPORT(void,png_set_filler) PNGARG((png_structp png_ptr,+
−
   png_uint_32 filler, int flags));+
−
/* The values of the PNG_FILLER_ defines should NOT be changed */+
−
#define PNG_FILLER_BEFORE 0+
−
#define PNG_FILLER_AFTER 1+
−
/* Add an alpha byte to 8-bit Gray or 24-bit RGB images. */+
−
#if !defined(PNG_1_0_X)+
−
extern PNG_EXPORT(void,png_set_add_alpha) PNGARG((png_structp png_ptr,+
−
   png_uint_32 filler, int flags));+
−
#endif+
−
#endif /* PNG_READ_FILLER_SUPPORTED || PNG_WRITE_FILLER_SUPPORTED */+
−
+
−
#if defined(PNG_READ_SWAP_SUPPORTED) || defined(PNG_WRITE_SWAP_SUPPORTED)+
−
/* Swap bytes in 16-bit depth files. */+
−
extern PNG_EXPORT(void,png_set_swap) PNGARG((png_structp png_ptr));+
−
#endif+
−
+
−
#if defined(PNG_READ_PACK_SUPPORTED) || defined(PNG_WRITE_PACK_SUPPORTED)+
−
/* Use 1 byte per pixel in 1, 2, or 4-bit depth files. */+
−
extern PNG_EXPORT(void,png_set_packing) PNGARG((png_structp png_ptr));+
−
#endif+
−
+
−
#if defined(PNG_READ_PACKSWAP_SUPPORTED) || defined(PNG_WRITE_PACKSWAP_SUPPORTED)+
−
/* Swap packing order of pixels in bytes. */+
−
extern PNG_EXPORT(void,png_set_packswap) PNGARG((png_structp png_ptr));+
−
#endif+
−
+
−
#if defined(PNG_READ_SHIFT_SUPPORTED) || defined(PNG_WRITE_SHIFT_SUPPORTED)+
−
/* Converts files to legal bit depths. */+
−
extern PNG_EXPORT(void,png_set_shift) PNGARG((png_structp png_ptr,+
−
   png_color_8p true_bits));+
−
#endif+
−
+
−
#if defined(PNG_READ_INTERLACING_SUPPORTED) || \+
−
    defined(PNG_WRITE_INTERLACING_SUPPORTED)+
−
/* Have the code handle the interlacing.  Returns the number of passes. */+
−
extern PNG_EXPORT(int,png_set_interlace_handling) PNGARG((png_structp png_ptr));+
−
#endif+
−
+
−
#if defined(PNG_READ_INVERT_SUPPORTED) || defined(PNG_WRITE_INVERT_SUPPORTED)+
−
/* Invert monochrome files */+
−
extern PNG_EXPORT(void,png_set_invert_mono) PNGARG((png_structp png_ptr));+
−
#endif+
−
+
−
#if defined(PNG_READ_BACKGROUND_SUPPORTED)+
−
/* Handle alpha and tRNS by replacing with a background color. */+
−
#ifdef PNG_FLOATING_POINT_SUPPORTED+
−
extern PNG_EXPORT(void,png_set_background) PNGARG((png_structp png_ptr,+
−
   png_color_16p background_color, int background_gamma_code,+
−
   int need_expand, double background_gamma));+
−
#endif+
−
#define PNG_BACKGROUND_GAMMA_UNKNOWN 0+
−
#define PNG_BACKGROUND_GAMMA_SCREEN  1+
−
#define PNG_BACKGROUND_GAMMA_FILE    2+
−
#define PNG_BACKGROUND_GAMMA_UNIQUE  3+
−
#endif+
−
+
−
#if defined(PNG_READ_16_TO_8_SUPPORTED)+
−
/* Strip the second byte of information from a 16-bit depth file. */+
−
extern PNG_EXPORT(void,png_set_strip_16) PNGARG((png_structp png_ptr));+
−
#endif+
−
+
−
#if defined(PNG_READ_DITHER_SUPPORTED)+
−
/* Turn on dithering, and reduce the palette to the number of colors available. */+
−
extern PNG_EXPORT(void,png_set_dither) PNGARG((png_structp png_ptr,+
−
   png_colorp palette, int num_palette, int maximum_colors,+
−
   png_uint_16p histogram, int full_dither));+
−
#endif+
−
+
−
#if defined(PNG_READ_GAMMA_SUPPORTED)+
−
/* Handle gamma correction. Screen_gamma=(display_exponent) */+
−
#ifdef PNG_FLOATING_POINT_SUPPORTED+
−
extern PNG_EXPORT(void,png_set_gamma) PNGARG((png_structp png_ptr,+
−
   double screen_gamma, double default_file_gamma));+
−
#endif+
−
#endif+
−
+
−
#if defined(PNG_1_0_X) || defined (PNG_1_2_X)+
−
#if defined(PNG_READ_EMPTY_PLTE_SUPPORTED) || \+
−
    defined(PNG_WRITE_EMPTY_PLTE_SUPPORTED)+
−
/* Permit or disallow empty PLTE (0: not permitted, 1: permitted) */+
−
/* Deprecated and will be removed.  Use png_permit_mng_features() instead. */+
−
extern PNG_EXPORT(void,png_permit_empty_plte) PNGARG((png_structp png_ptr,+
−
   int empty_plte_permitted));+
−
#endif+
−
#endif+
−
+
−
#if defined(PNG_WRITE_FLUSH_SUPPORTED)+
−
/* Set how many lines between output flushes - 0 for no flushing */+
−
extern PNG_EXPORT(void,png_set_flush) PNGARG((png_structp png_ptr, int nrows));+
−
/* Flush the current PNG output buffer */+
−
extern PNG_EXPORT(void,png_write_flush) PNGARG((png_structp png_ptr));+
−
#endif+
−
+
−
/* Optional update palette with requested transformations */+
−
extern PNG_EXPORT(void,png_start_read_image) PNGARG((png_structp png_ptr));+
−
+
−
/* Optional call to update the users info structure */+
−
extern PNG_EXPORT(void,png_read_update_info) PNGARG((png_structp png_ptr,+
−
   png_infop info_ptr));+
−
+
−
#ifndef PNG_NO_SEQUENTIAL_READ_SUPPORTED+
−
/* Read one or more rows of image data. */+
−
extern PNG_EXPORT(void,png_read_rows) PNGARG((png_structp png_ptr,+
−
   png_bytepp row, png_bytepp display_row, png_uint_32 num_rows));+
−
#endif+
−
+
−
#ifndef PNG_NO_SEQUENTIAL_READ_SUPPORTED+
−
/* Read a row of data. */+
−
extern PNG_EXPORT(void,png_read_row) PNGARG((png_structp png_ptr,+
−
   png_bytep row,+
−
   png_bytep display_row));+
−
#endif+
−
+
−
#ifndef PNG_NO_SEQUENTIAL_READ_SUPPORTED+
−
/* Read the whole image into memory at once. */+
−
extern PNG_EXPORT(void,png_read_image) PNGARG((png_structp png_ptr,+
−
   png_bytepp image));+
−
#endif+
−
+
−
/* Write a row of image data */+
−
extern PNG_EXPORT(void,png_write_row) PNGARG((png_structp png_ptr,+
−
   png_bytep row));+
−
+
−
/* Write a few rows of image data */+
−
extern PNG_EXPORT(void,png_write_rows) PNGARG((png_structp png_ptr,+
−
   png_bytepp row, png_uint_32 num_rows));+
−
+
−
/* Write the image data */+
−
extern PNG_EXPORT(void,png_write_image) PNGARG((png_structp png_ptr,+
−
   png_bytepp image));+
−
+
−
/* Writes the end of the PNG file. */+
−
extern PNG_EXPORT(void,png_write_end) PNGARG((png_structp png_ptr,+
−
   png_infop info_ptr));+
−
+
−
#ifndef PNG_NO_SEQUENTIAL_READ_SUPPORTED+
−
/* Read the end of the PNG file. */+
−
extern PNG_EXPORT(void,png_read_end) PNGARG((png_structp png_ptr,+
−
   png_infop info_ptr));+
−
#endif+
−
+
−
/* Free any memory associated with the png_info_struct */+
−
extern PNG_EXPORT(void,png_destroy_info_struct) PNGARG((png_structp png_ptr,+
−
   png_infopp info_ptr_ptr));+
−
+
−
/* Free any memory associated with the png_struct and the png_info_structs */+
−
extern PNG_EXPORT(void,png_destroy_read_struct) PNGARG((png_structpp+
−
   png_ptr_ptr, png_infopp info_ptr_ptr, png_infopp end_info_ptr_ptr));+
−
+
−
/* Free all memory used by the read (old method - NOT DLL EXPORTED) */+
−
extern void png_read_destroy PNGARG((png_structp png_ptr, png_infop info_ptr,+
−
   png_infop end_info_ptr));+
−
+
−
/* Free any memory associated with the png_struct and the png_info_structs */+
−
extern PNG_EXPORT(void,png_destroy_write_struct)+
−
   PNGARG((png_structpp png_ptr_ptr, png_infopp info_ptr_ptr));+
−
+
−
/* Free any memory used in png_ptr struct (old method - NOT DLL EXPORTED) */+
−
extern void png_write_destroy PNGARG((png_structp png_ptr));+
−
+
−
/* Set the libpng method of handling chunk CRC errors */+
−
extern PNG_EXPORT(void,png_set_crc_action) PNGARG((png_structp png_ptr,+
−
   int crit_action, int ancil_action));+
−
+
−
/* Values for png_set_crc_action() to say how to handle CRC errors in+
−
 * ancillary and critical chunks, and whether to use the data contained+
−
 * therein.  Note that it is impossible to "discard" data in a critical+
−
 * chunk.  For versions prior to 0.90, the action was always error/quit,+
−
 * whereas in version 0.90 and later, the action for CRC errors in ancillary+
−
 * chunks is warn/discard.  These values should NOT be changed.+
−
 *+
−
 *      value                       action:critical     action:ancillary+
−
 */+
−
#define PNG_CRC_DEFAULT       0  /* error/quit          warn/discard data */+
−
#define PNG_CRC_ERROR_QUIT    1  /* error/quit          error/quit        */+
−
#define PNG_CRC_WARN_DISCARD  2  /* (INVALID)           warn/discard data */+
−
#define PNG_CRC_WARN_USE      3  /* warn/use data       warn/use data     */+
−
#define PNG_CRC_QUIET_USE     4  /* quiet/use data      quiet/use data    */+
−
#define PNG_CRC_NO_CHANGE     5  /* use current value   use current value */+
−
+
−
/* These functions give the user control over the scan-line filtering in+
−
 * libpng and the compression methods used by zlib.  These functions are+
−
 * mainly useful for testing, as the defaults should work with most users.+
−
 * Those users who are tight on memory or want faster performance at the+
−
 * expense of compression can modify them.  See the compression library+
−
 * header file (zlib.h) for an explination of the compression functions.+
−
 */+
−
+
−
/* Set the filtering method(s) used by libpng.  Currently, the only valid+
−
 * value for "method" is 0.+
−
 */+
−
extern PNG_EXPORT(void,png_set_filter) PNGARG((png_structp png_ptr, int method,+
−
   int filters));+
−
+
−
/* Flags for png_set_filter() to say which filters to use.  The flags+
−
 * are chosen so that they don't conflict with real filter types+
−
 * below, in case they are supplied instead of the #defined constants.+
−
 * These values should NOT be changed.+
−
 */+
−
#define PNG_NO_FILTERS     0x00+
−
#define PNG_FILTER_NONE    0x08+
−
#define PNG_FILTER_SUB     0x10+
−
#define PNG_FILTER_UP      0x20+
−
#define PNG_FILTER_AVG     0x40+
−
#define PNG_FILTER_PAETH   0x80+
−
#define PNG_ALL_FILTERS (PNG_FILTER_NONE | PNG_FILTER_SUB | PNG_FILTER_UP | \+
−
                         PNG_FILTER_AVG | PNG_FILTER_PAETH)+
−
+
−
/* Filter values (not flags) - used in pngwrite.c, pngwutil.c for now.+
−
 * These defines should NOT be changed.+
−
 */+
−
#define PNG_FILTER_VALUE_NONE  0+
−
#define PNG_FILTER_VALUE_SUB   1+
−
#define PNG_FILTER_VALUE_UP    2+
−
#define PNG_FILTER_VALUE_AVG   3+
−
#define PNG_FILTER_VALUE_PAETH 4+
−
#define PNG_FILTER_VALUE_LAST  5+
−
+
−
#if defined(PNG_WRITE_WEIGHTED_FILTER_SUPPORTED) /* EXPERIMENTAL */+
−
/* The "heuristic_method" is given by one of the PNG_FILTER_HEURISTIC_+
−
 * defines, either the default (minimum-sum-of-absolute-differences), or+
−
 * the experimental method (weighted-minimum-sum-of-absolute-differences).+
−
 *+
−
 * Weights are factors >= 1.0, indicating how important it is to keep the+
−
 * filter type consistent between rows.  Larger numbers mean the current+
−
 * filter is that many times as likely to be the same as the "num_weights"+
−
 * previous filters.  This is cumulative for each previous row with a weight.+
−
 * There needs to be "num_weights" values in "filter_weights", or it can be+
−
 * NULL if the weights aren't being specified.  Weights have no influence on+
−
 * the selection of the first row filter.  Well chosen weights can (in theory)+
−
 * improve the compression for a given image.+
−
 *+
−
 * Costs are factors >= 1.0 indicating the relative decoding costs of a+
−
 * filter type.  Higher costs indicate more decoding expense, and are+
−
 * therefore less likely to be selected over a filter with lower computational+
−
 * costs.  There needs to be a value in "filter_costs" for each valid filter+
−
 * type (given by PNG_FILTER_VALUE_LAST), or it can be NULL if you aren't+
−
 * setting the costs.  Costs try to improve the speed of decompression without+
−
 * unduly increasing the compressed image size.+
−
 *+
−
 * A negative weight or cost indicates the default value is to be used, and+
−
 * values in the range [0.0, 1.0) indicate the value is to remain unchanged.+
−
 * The default values for both weights and costs are currently 1.0, but may+
−
 * change if good general weighting/cost heuristics can be found.  If both+
−
 * the weights and costs are set to 1.0, this degenerates the WEIGHTED method+
−
 * to the UNWEIGHTED method, but with added encoding time/computation.+
−
 */+
−
#ifdef PNG_FLOATING_POINT_SUPPORTED+
−
extern PNG_EXPORT(void,png_set_filter_heuristics) PNGARG((png_structp png_ptr,+
−
   int heuristic_method, int num_weights, png_doublep filter_weights,+
−
   png_doublep filter_costs));+
−
#endif+
−
#endif /*  PNG_WRITE_WEIGHTED_FILTER_SUPPORTED */+
−
+
−
/* Heuristic used for row filter selection.  These defines should NOT be+
−
 * changed.+
−
 */+
−
#define PNG_FILTER_HEURISTIC_DEFAULT    0  /* Currently "UNWEIGHTED" */+
−
#define PNG_FILTER_HEURISTIC_UNWEIGHTED 1  /* Used by libpng < 0.95 */+
−
#define PNG_FILTER_HEURISTIC_WEIGHTED   2  /* Experimental feature */+
−
#define PNG_FILTER_HEURISTIC_LAST       3  /* Not a valid value */+
−
+
−
/* Set the library compression level.  Currently, valid values range from+
−
 * 0 - 9, corresponding directly to the zlib compression levels 0 - 9+
−
 * (0 - no compression, 9 - "maximal" compression).  Note that tests have+
−
 * shown that zlib compression levels 3-6 usually perform as well as level 9+
−
 * for PNG images, and do considerably fewer caclulations.  In the future,+
−
 * these values may not correspond directly to the zlib compression levels.+
−
 */+
−
extern PNG_EXPORT(void,png_set_compression_level) PNGARG((png_structp png_ptr,+
−
   int level));+
−
+
−
extern PNG_EXPORT(void,png_set_compression_mem_level)+
−
   PNGARG((png_structp png_ptr, int mem_level));+
−
+
−
extern PNG_EXPORT(void,png_set_compression_strategy)+
−
   PNGARG((png_structp png_ptr, int strategy));+
−
+
−
extern PNG_EXPORT(void,png_set_compression_window_bits)+
−
   PNGARG((png_structp png_ptr, int window_bits));+
−
+
−
extern PNG_EXPORT(void,png_set_compression_method) PNGARG((png_structp png_ptr,+
−
   int method));+
−
+
−
/* These next functions are called for input/output, memory, and error+
−
 * handling.  They are in the file pngrio.c, pngwio.c, and pngerror.c,+
−
 * and call standard C I/O routines such as fread(), fwrite(), and+
−
 * fprintf().  These functions can be made to use other I/O routines+
−
 * at run time for those applications that need to handle I/O in a+
−
 * different manner by calling png_set_???_fn().  See libpng.txt for+
−
 * more information.+
−
 */+
−
+
−
#if !defined(PNG_NO_STDIO)+
−
/* Initialize the input/output for the PNG file to the default functions. */+
−
extern PNG_EXPORT(void,png_init_io) PNGARG((png_structp png_ptr, png_FILE_p fp));+
−
#endif+
−
+
−
/* Replace the (error and abort), and warning functions with user+
−
 * supplied functions.  If no messages are to be printed you must still+
−
 * write and use replacement functions. The replacement error_fn should+
−
 * still do a longjmp to the last setjmp location if you are using this+
−
 * method of error handling.  If error_fn or warning_fn is NULL, the+
−
 * default function will be used.+
−
 */+
−
+
−
extern PNG_EXPORT(void,png_set_error_fn) PNGARG((png_structp png_ptr,+
−
   png_voidp error_ptr, png_error_ptr error_fn, png_error_ptr warning_fn));+
−
+
−
/* Return the user pointer associated with the error functions */+
−
extern PNG_EXPORT(png_voidp,png_get_error_ptr) PNGARG((png_structp png_ptr));+
−
+
−
/* Replace the default data output functions with a user supplied one(s).+
−
 * If buffered output is not used, then output_flush_fn can be set to NULL.+
−
 * If PNG_WRITE_FLUSH_SUPPORTED is not defined at libpng compile time+
−
 * output_flush_fn will be ignored (and thus can be NULL).+
−
 * It is probably a mistake to use NULL for output_flush_fn if+
−
 * write_data_fn is not also NULL unless you have built libpng with+
−
 * PNG_WRITE_FLUSH_SUPPORTED undefined, because in this case libpng's+
−
 * default flush function, which uses the standard *FILE structure, will+
−
 * be used.+
−
 */+
−
extern PNG_EXPORT(void,png_set_write_fn) PNGARG((png_structp png_ptr,+
−
   png_voidp io_ptr, png_rw_ptr write_data_fn, png_flush_ptr output_flush_fn));+
−
+
−
/* Replace the default data input function with a user supplied one. */+
−
extern PNG_EXPORT(void,png_set_read_fn) PNGARG((png_structp png_ptr,+
−
   png_voidp io_ptr, png_rw_ptr read_data_fn));+
−
+
−
/* Return the user pointer associated with the I/O functions */+
−
extern PNG_EXPORT(png_voidp,png_get_io_ptr) PNGARG((png_structp png_ptr));+
−
+
−
extern PNG_EXPORT(void,png_set_read_status_fn) PNGARG((png_structp png_ptr,+
−
   png_read_status_ptr read_row_fn));+
−
+
−
extern PNG_EXPORT(void,png_set_write_status_fn) PNGARG((png_structp png_ptr,+
−
   png_write_status_ptr write_row_fn));+
−
+
−
#ifdef PNG_USER_MEM_SUPPORTED+
−
/* Replace the default memory allocation functions with user supplied one(s). */+
−
extern PNG_EXPORT(void,png_set_mem_fn) PNGARG((png_structp png_ptr,+
−
   png_voidp mem_ptr, png_malloc_ptr malloc_fn, png_free_ptr free_fn));+
−
/* Return the user pointer associated with the memory functions */+
−
extern PNG_EXPORT(png_voidp,png_get_mem_ptr) PNGARG((png_structp png_ptr));+
−
#endif+
−
+
−
#if defined(PNG_READ_USER_TRANSFORM_SUPPORTED) || \+
−
    defined(PNG_LEGACY_SUPPORTED)+
−
extern PNG_EXPORT(void,png_set_read_user_transform_fn) PNGARG((png_structp+
−
   png_ptr, png_user_transform_ptr read_user_transform_fn));+
−
#endif+
−
+
−
#if defined(PNG_WRITE_USER_TRANSFORM_SUPPORTED) || \+
−
    defined(PNG_LEGACY_SUPPORTED)+
−
extern PNG_EXPORT(void,png_set_write_user_transform_fn) PNGARG((png_structp+
−
   png_ptr, png_user_transform_ptr write_user_transform_fn));+
−
#endif+
−
+
−
#if defined(PNG_READ_USER_TRANSFORM_SUPPORTED) || \+
−
    defined(PNG_WRITE_USER_TRANSFORM_SUPPORTED) || \+
−
    defined(PNG_LEGACY_SUPPORTED)+
−
extern PNG_EXPORT(void,png_set_user_transform_info) PNGARG((png_structp+
−
   png_ptr, png_voidp user_transform_ptr, int user_transform_depth,+
−
   int user_transform_channels));+
−
/* Return the user pointer associated with the user transform functions */+
−
extern PNG_EXPORT(png_voidp,png_get_user_transform_ptr)+
−
   PNGARG((png_structp png_ptr));+
−
#endif+
−
+
−
#ifdef PNG_USER_CHUNKS_SUPPORTED+
−
extern PNG_EXPORT(void,png_set_read_user_chunk_fn) PNGARG((png_structp png_ptr,+
−
   png_voidp user_chunk_ptr, png_user_chunk_ptr read_user_chunk_fn));+
−
extern PNG_EXPORT(png_voidp,png_get_user_chunk_ptr) PNGARG((png_structp+
−
   png_ptr));+
−
#endif+
−
+
−
#ifdef PNG_PROGRESSIVE_READ_SUPPORTED+
−
/* Sets the function callbacks for the push reader, and a pointer to a+
−
 * user-defined structure available to the callback functions.+
−
 */+
−
extern PNG_EXPORT(void,png_set_progressive_read_fn) PNGARG((png_structp png_ptr,+
−
   png_voidp progressive_ptr,+
−
   png_progressive_info_ptr info_fn, png_progressive_row_ptr row_fn,+
−
   png_progressive_end_ptr end_fn));+
−
+
−
/* Returns the user pointer associated with the push read functions */+
−
extern PNG_EXPORT(png_voidp,png_get_progressive_ptr)+
−
   PNGARG((png_structp png_ptr));+
−
+
−
/* Function to be called when data becomes available */+
−
extern PNG_EXPORT(void,png_process_data) PNGARG((png_structp png_ptr,+
−
   png_infop info_ptr, png_bytep buffer, png_size_t buffer_size));+
−
+
−
/* Function that combines rows.  Not very much different than the+
−
 * png_combine_row() call.  Is this even used?????+
−
 */+
−
extern PNG_EXPORT(void,png_progressive_combine_row) PNGARG((png_structp png_ptr,+
−
   png_bytep old_row, png_bytep new_row));+
−
#endif /* PNG_PROGRESSIVE_READ_SUPPORTED */+
−
+
−
extern PNG_EXPORT(png_voidp,png_malloc) PNGARG((png_structp png_ptr,+
−
   png_uint_32 size));+
−
+
−
#if defined(PNG_1_0_X)+
−
#  define png_malloc_warn png_malloc+
−
#else+
−
/* Added at libpng version 1.2.4 */+
−
extern PNG_EXPORT(png_voidp,png_malloc_warn) PNGARG((png_structp png_ptr,+
−
   png_uint_32 size));+
−
#endif+
−
+
−
/* Frees a pointer allocated by png_malloc() */+
−
extern PNG_EXPORT(void,png_free) PNGARG((png_structp png_ptr, png_voidp ptr));+
−
+
−
#if defined(PNG_1_0_X)+
−
/* Function to allocate memory for zlib. */+
−
extern PNG_EXPORT(voidpf,png_zalloc) PNGARG((voidpf png_ptr, uInt items,+
−
   uInt size));+
−
+
−
/* Function to free memory for zlib */+
−
extern PNG_EXPORT(void,png_zfree) PNGARG((voidpf png_ptr, voidpf ptr));+
−
#endif+
−
+
−
/* Free data that was allocated internally */+
−
extern PNG_EXPORT(void,png_free_data) PNGARG((png_structp png_ptr,+
−
   png_infop info_ptr, png_uint_32 free_me, int num));+
−
#ifdef PNG_FREE_ME_SUPPORTED+
−
/* Reassign responsibility for freeing existing data, whether allocated+
−
 * by libpng or by the application+
−
 */+
−
extern PNG_EXPORT(void,png_data_freer) PNGARG((png_structp png_ptr,+
−
   png_infop info_ptr, int freer, png_uint_32 mask));+
−
#endif+
−
/* Assignments for png_data_freer */+
−
#define PNG_DESTROY_WILL_FREE_DATA 1+
−
#define PNG_SET_WILL_FREE_DATA 1+
−
#define PNG_USER_WILL_FREE_DATA 2+
−
/* Flags for png_ptr->free_me and info_ptr->free_me */+
−
#define PNG_FREE_HIST 0x0008+
−
#define PNG_FREE_ICCP 0x0010+
−
#define PNG_FREE_SPLT 0x0020+
−
#define PNG_FREE_ROWS 0x0040+
−
#define PNG_FREE_PCAL 0x0080+
−
#define PNG_FREE_SCAL 0x0100+
−
#define PNG_FREE_UNKN 0x0200+
−
#define PNG_FREE_LIST 0x0400+
−
#define PNG_FREE_PLTE 0x1000+
−
#define PNG_FREE_TRNS 0x2000+
−
#define PNG_FREE_TEXT 0x4000+
−
#define PNG_FREE_ALL  0x7fff+
−
#define PNG_FREE_MUL  0x4220 /* PNG_FREE_SPLT|PNG_FREE_TEXT|PNG_FREE_UNKN */+
−
+
−
#ifdef PNG_USER_MEM_SUPPORTED+
−
extern PNG_EXPORT(png_voidp,png_malloc_default) PNGARG((png_structp png_ptr,+
−
   png_uint_32 size));+
−
extern PNG_EXPORT(void,png_free_default) PNGARG((png_structp png_ptr,+
−
   png_voidp ptr));+
−
#endif+
−
+
−
extern PNG_EXPORT(png_voidp,png_memcpy_check) PNGARG((png_structp png_ptr,+
−
   png_voidp s1, png_voidp s2, png_uint_32 size));+
−
+
−
extern PNG_EXPORT(png_voidp,png_memset_check) PNGARG((png_structp png_ptr,+
−
   png_voidp s1, int value, png_uint_32 size));+
−
+
−
#if defined(USE_FAR_KEYWORD)  /* memory model conversion function */+
−
extern void *png_far_to_near PNGARG((png_structp png_ptr,png_voidp ptr,+
−
   int check));+
−
#endif /* USE_FAR_KEYWORD */+
−
+
−
#ifndef PNG_NO_ERROR_TEXT+
−
/* Fatal error in PNG image of libpng - can't continue */+
−
extern PNG_EXPORT(void,png_error) PNGARG((png_structp png_ptr,+
−
   png_const_charp error_message));+
−
+
−
/* The same, but the chunk name is prepended to the error string. */+
−
extern PNG_EXPORT(void,png_chunk_error) PNGARG((png_structp png_ptr,+
−
   png_const_charp error_message));+
−
#else+
−
/* Fatal error in PNG image of libpng - can't continue */+
−
extern PNG_EXPORT(void,png_err) PNGARG((png_structp png_ptr));+
−
#endif+
−
+
−
#ifndef PNG_NO_WARNINGS+
−
/* Non-fatal error in libpng.  Can continue, but may have a problem. */+
−
extern PNG_EXPORT(void,png_warning) PNGARG((png_structp png_ptr,+
−
   png_const_charp warning_message));+
−
+
−
#ifdef PNG_READ_SUPPORTED+
−
/* Non-fatal error in libpng, chunk name is prepended to message. */+
−
extern PNG_EXPORT(void,png_chunk_warning) PNGARG((png_structp png_ptr,+
−
   png_const_charp warning_message));+
−
#endif /* PNG_READ_SUPPORTED */+
−
#endif /* PNG_NO_WARNINGS */+
−
+
−
/* The png_set_<chunk> functions are for storing values in the png_info_struct.+
−
 * Similarly, the png_get_<chunk> calls are used to read values from the+
−
 * png_info_struct, either storing the parameters in the passed variables, or+
−
 * setting pointers into the png_info_struct where the data is stored.  The+
−
 * png_get_<chunk> functions return a non-zero value if the data was available+
−
 * in info_ptr, or return zero and do not change any of the parameters if the+
−
 * data was not available.+
−
 *+
−
 * These functions should be used instead of directly accessing png_info+
−
 * to avoid problems with future changes in the size and internal layout of+
−
 * png_info_struct.+
−
 */+
−
/* Returns "flag" if chunk data is valid in info_ptr. */+
−
extern PNG_EXPORT(png_uint_32,png_get_valid) PNGARG((png_structp png_ptr,+
−
png_infop info_ptr, png_uint_32 flag));+
−
+
−
/* Returns number of bytes needed to hold a transformed row. */+
−
extern PNG_EXPORT(png_uint_32,png_get_rowbytes) PNGARG((png_structp png_ptr,+
−
png_infop info_ptr));+
−
+
−
#if defined(PNG_INFO_IMAGE_SUPPORTED)+
−
/* Returns row_pointers, which is an array of pointers to scanlines that was+
−
 * returned from png_read_png().+
−
 */+
−
extern PNG_EXPORT(png_bytepp,png_get_rows) PNGARG((png_structp png_ptr,+
−
png_infop info_ptr));+
−
/* Set row_pointers, which is an array of pointers to scanlines for use+
−
 * by png_write_png().+
−
 */+
−
extern PNG_EXPORT(void,png_set_rows) PNGARG((png_structp png_ptr,+
−
   png_infop info_ptr, png_bytepp row_pointers));+
−
#endif+
−
+
−
/* Returns number of color channels in image. */+
−
extern PNG_EXPORT(png_byte,png_get_channels) PNGARG((png_structp png_ptr,+
−
png_infop info_ptr));+
−
+
−
#ifdef PNG_EASY_ACCESS_SUPPORTED+
−
/* Returns image width in pixels. */+
−
extern PNG_EXPORT(png_uint_32, png_get_image_width) PNGARG((png_structp+
−
png_ptr, png_infop info_ptr));+
−
+
−
/* Returns image height in pixels. */+
−
extern PNG_EXPORT(png_uint_32, png_get_image_height) PNGARG((png_structp+
−
png_ptr, png_infop info_ptr));+
−
+
−
/* Returns image bit_depth. */+
−
extern PNG_EXPORT(png_byte, png_get_bit_depth) PNGARG((png_structp+
−
png_ptr, png_infop info_ptr));+
−
+
−
/* Returns image color_type. */+
−
extern PNG_EXPORT(png_byte, png_get_color_type) PNGARG((png_structp+
−
png_ptr, png_infop info_ptr));+
−
+
−
/* Returns image filter_type. */+
−
extern PNG_EXPORT(png_byte, png_get_filter_type) PNGARG((png_structp+
−
png_ptr, png_infop info_ptr));+
−
+
−
/* Returns image interlace_type. */+
−
extern PNG_EXPORT(png_byte, png_get_interlace_type) PNGARG((png_structp+
−
png_ptr, png_infop info_ptr));+
−
+
−
/* Returns image compression_type. */+
−
extern PNG_EXPORT(png_byte, png_get_compression_type) PNGARG((png_structp+
−
png_ptr, png_infop info_ptr));+
−
+
−
/* Returns image resolution in pixels per meter, from pHYs chunk data. */+
−
extern PNG_EXPORT(png_uint_32, png_get_pixels_per_meter) PNGARG((png_structp+
−
png_ptr, png_infop info_ptr));+
−
extern PNG_EXPORT(png_uint_32, png_get_x_pixels_per_meter) PNGARG((png_structp+
−
png_ptr, png_infop info_ptr));+
−
extern PNG_EXPORT(png_uint_32, png_get_y_pixels_per_meter) PNGARG((png_structp+
−
png_ptr, png_infop info_ptr));+
−
+
−
/* Returns pixel aspect ratio, computed from pHYs chunk data.  */+
−
#ifdef PNG_FLOATING_POINT_SUPPORTED+
−
extern PNG_EXPORT(float, png_get_pixel_aspect_ratio) PNGARG((png_structp+
−
png_ptr, png_infop info_ptr));+
−
#endif+
−
+
−
/* Returns image x, y offset in pixels or microns, from oFFs chunk data. */+
−
extern PNG_EXPORT(png_int_32, png_get_x_offset_pixels) PNGARG((png_structp+
−
png_ptr, png_infop info_ptr));+
−
extern PNG_EXPORT(png_int_32, png_get_y_offset_pixels) PNGARG((png_structp+
−
png_ptr, png_infop info_ptr));+
−
extern PNG_EXPORT(png_int_32, png_get_x_offset_microns) PNGARG((png_structp+
−
png_ptr, png_infop info_ptr));+
−
extern PNG_EXPORT(png_int_32, png_get_y_offset_microns) PNGARG((png_structp+
−
png_ptr, png_infop info_ptr));+
−
+
−
#endif /* PNG_EASY_ACCESS_SUPPORTED */+
−
+
−
/* Returns pointer to signature string read from PNG header */+
−
extern PNG_EXPORT(png_bytep,png_get_signature) PNGARG((png_structp png_ptr,+
−
png_infop info_ptr));+
−
+
−
#if defined(PNG_bKGD_SUPPORTED)+
−
extern PNG_EXPORT(png_uint_32,png_get_bKGD) PNGARG((png_structp png_ptr,+
−
   png_infop info_ptr, png_color_16p *background));+
−
#endif+
−
+
−
#if defined(PNG_bKGD_SUPPORTED)+
−
extern PNG_EXPORT(void,png_set_bKGD) PNGARG((png_structp png_ptr,+
−
   png_infop info_ptr, png_color_16p background));+
−
#endif+
−
+
−
#if defined(PNG_cHRM_SUPPORTED)+
−
#ifdef PNG_FLOATING_POINT_SUPPORTED+
−
extern PNG_EXPORT(png_uint_32,png_get_cHRM) PNGARG((png_structp png_ptr,+
−
   png_infop info_ptr, double *white_x, double *white_y, double *red_x,+
−
   double *red_y, double *green_x, double *green_y, double *blue_x,+
−
   double *blue_y));+
−
#endif+
−
#ifdef PNG_FIXED_POINT_SUPPORTED+
−
extern PNG_EXPORT(png_uint_32,png_get_cHRM_fixed) PNGARG((png_structp png_ptr,+
−
   png_infop info_ptr, png_fixed_point *int_white_x, png_fixed_point+
−
   *int_white_y, png_fixed_point *int_red_x, png_fixed_point *int_red_y,+
−
   png_fixed_point *int_green_x, png_fixed_point *int_green_y, png_fixed_point+
−
   *int_blue_x, png_fixed_point *int_blue_y));+
−
#endif+
−
#endif+
−
+
−
#if defined(PNG_cHRM_SUPPORTED)+
−
#ifdef PNG_FLOATING_POINT_SUPPORTED+
−
extern PNG_EXPORT(void,png_set_cHRM) PNGARG((png_structp png_ptr,+
−
   png_infop info_ptr, double white_x, double white_y, double red_x,+
−
   double red_y, double green_x, double green_y, double blue_x, double blue_y));+
−
#endif+
−
#ifdef PNG_FIXED_POINT_SUPPORTED+
−
extern PNG_EXPORT(void,png_set_cHRM_fixed) PNGARG((png_structp png_ptr,+
−
   png_infop info_ptr, png_fixed_point int_white_x, png_fixed_point int_white_y,+
−
   png_fixed_point int_red_x, png_fixed_point int_red_y, png_fixed_point+
−
   int_green_x, png_fixed_point int_green_y, png_fixed_point int_blue_x,+
−
   png_fixed_point int_blue_y));+
−
#endif+
−
#endif+
−
+
−
#if defined(PNG_gAMA_SUPPORTED)+
−
#ifdef PNG_FLOATING_POINT_SUPPORTED+
−
extern PNG_EXPORT(png_uint_32,png_get_gAMA) PNGARG((png_structp png_ptr,+
−
   png_infop info_ptr, double *file_gamma));+
−
#endif+
−
extern PNG_EXPORT(png_uint_32,png_get_gAMA_fixed) PNGARG((png_structp png_ptr,+
−
   png_infop info_ptr, png_fixed_point *int_file_gamma));+
−
#endif+
−
+
−
#if defined(PNG_gAMA_SUPPORTED)+
−
#ifdef PNG_FLOATING_POINT_SUPPORTED+
−
extern PNG_EXPORT(void,png_set_gAMA) PNGARG((png_structp png_ptr,+
−
   png_infop info_ptr, double file_gamma));+
−
#endif+
−
extern PNG_EXPORT(void,png_set_gAMA_fixed) PNGARG((png_structp png_ptr,+
−
   png_infop info_ptr, png_fixed_point int_file_gamma));+
−
#endif+
−
+
−
#if defined(PNG_hIST_SUPPORTED)+
−
extern PNG_EXPORT(png_uint_32,png_get_hIST) PNGARG((png_structp png_ptr,+
−
   png_infop info_ptr, png_uint_16p *hist));+
−
#endif+
−
+
−
#if defined(PNG_hIST_SUPPORTED)+
−
extern PNG_EXPORT(void,png_set_hIST) PNGARG((png_structp png_ptr,+
−
   png_infop info_ptr, png_uint_16p hist));+
−
#endif+
−
+
−
extern PNG_EXPORT(png_uint_32,png_get_IHDR) PNGARG((png_structp png_ptr,+
−
   png_infop info_ptr, png_uint_32 *width, png_uint_32 *height,+
−
   int *bit_depth, int *color_type, int *interlace_method,+
−
   int *compression_method, int *filter_method));+
−
+
−
extern PNG_EXPORT(void,png_set_IHDR) PNGARG((png_structp png_ptr,+
−
   png_infop info_ptr, png_uint_32 width, png_uint_32 height, int bit_depth,+
−
   int color_type, int interlace_method, int compression_method,+
−
   int filter_method));+
−
+
−
#if defined(PNG_oFFs_SUPPORTED)+
−
extern PNG_EXPORT(png_uint_32,png_get_oFFs) PNGARG((png_structp png_ptr,+
−
   png_infop info_ptr, png_int_32 *offset_x, png_int_32 *offset_y,+
−
   int *unit_type));+
−
#endif+
−
+
−
#if defined(PNG_oFFs_SUPPORTED)+
−
extern PNG_EXPORT(void,png_set_oFFs) PNGARG((png_structp png_ptr,+
−
   png_infop info_ptr, png_int_32 offset_x, png_int_32 offset_y,+
−
   int unit_type));+
−
#endif+
−
+
−
#if defined(PNG_pCAL_SUPPORTED)+
−
extern PNG_EXPORT(png_uint_32,png_get_pCAL) PNGARG((png_structp png_ptr,+
−
   png_infop info_ptr, png_charp *purpose, png_int_32 *X0, png_int_32 *X1,+
−
   int *type, int *nparams, png_charp *units, png_charpp *params));+
−
#endif+
−
+
−
#if defined(PNG_pCAL_SUPPORTED)+
−
extern PNG_EXPORT(void,png_set_pCAL) PNGARG((png_structp png_ptr,+
−
   png_infop info_ptr, png_charp purpose, png_int_32 X0, png_int_32 X1,+
−
   int type, int nparams, png_charp units, png_charpp params));+
−
#endif+
−
+
−
#if defined(PNG_pHYs_SUPPORTED)+
−
extern PNG_EXPORT(png_uint_32,png_get_pHYs) PNGARG((png_structp png_ptr,+
−
   png_infop info_ptr, png_uint_32 *res_x, png_uint_32 *res_y, int *unit_type));+
−
#endif+
−
+
−
#if defined(PNG_pHYs_SUPPORTED)+
−
extern PNG_EXPORT(void,png_set_pHYs) PNGARG((png_structp png_ptr,+
−
   png_infop info_ptr, png_uint_32 res_x, png_uint_32 res_y, int unit_type));+
−
#endif+
−
+
−
extern PNG_EXPORT(png_uint_32,png_get_PLTE) PNGARG((png_structp png_ptr,+
−
   png_infop info_ptr, png_colorp *palette, int *num_palette));+
−
+
−
extern PNG_EXPORT(void,png_set_PLTE) PNGARG((png_structp png_ptr,+
−
   png_infop info_ptr, png_colorp palette, int num_palette));+
−
+
−
#if defined(PNG_sBIT_SUPPORTED)+
−
extern PNG_EXPORT(png_uint_32,png_get_sBIT) PNGARG((png_structp png_ptr,+
−
   png_infop info_ptr, png_color_8p *sig_bit));+
−
#endif+
−
+
−
#if defined(PNG_sBIT_SUPPORTED)+
−
extern PNG_EXPORT(void,png_set_sBIT) PNGARG((png_structp png_ptr,+
−
   png_infop info_ptr, png_color_8p sig_bit));+
−
#endif+
−
+
−
#if defined(PNG_sRGB_SUPPORTED)+
−
extern PNG_EXPORT(png_uint_32,png_get_sRGB) PNGARG((png_structp png_ptr,+
−
   png_infop info_ptr, int *intent));+
−
#endif+
−
+
−
#if defined(PNG_sRGB_SUPPORTED)+
−
extern PNG_EXPORT(void,png_set_sRGB) PNGARG((png_structp png_ptr,+
−
   png_infop info_ptr, int intent));+
−
extern PNG_EXPORT(void,png_set_sRGB_gAMA_and_cHRM) PNGARG((png_structp png_ptr,+
−
   png_infop info_ptr, int intent));+
−
#endif+
−
+
−
#if defined(PNG_iCCP_SUPPORTED)+
−
extern PNG_EXPORT(png_uint_32,png_get_iCCP) PNGARG((png_structp png_ptr,+
−
   png_infop info_ptr, png_charpp name, int *compression_type,+
−
   png_charpp profile, png_uint_32 *proflen));+
−
   /* Note to maintainer: profile should be png_bytepp */+
−
#endif+
−
+
−
#if defined(PNG_iCCP_SUPPORTED)+
−
extern PNG_EXPORT(void,png_set_iCCP) PNGARG((png_structp png_ptr,+
−
   png_infop info_ptr, png_charp name, int compression_type,+
−
   png_charp profile, png_uint_32 proflen));+
−
   /* Note to maintainer: profile should be png_bytep */+
−
#endif+
−
+
−
#if defined(PNG_sPLT_SUPPORTED)+
−
extern PNG_EXPORT(png_uint_32,png_get_sPLT) PNGARG((png_structp png_ptr,+
−
   png_infop info_ptr, png_sPLT_tpp entries));+
−
#endif+
−
+
−
#if defined(PNG_sPLT_SUPPORTED)+
−
extern PNG_EXPORT(void,png_set_sPLT) PNGARG((png_structp png_ptr,+
−
   png_infop info_ptr, png_sPLT_tp entries, int nentries));+
−
#endif+
−
+
−
#if defined(PNG_TEXT_SUPPORTED)+
−
/* png_get_text also returns the number of text chunks in *num_text */+
−
extern PNG_EXPORT(png_uint_32,png_get_text) PNGARG((png_structp png_ptr,+
−
   png_infop info_ptr, png_textp *text_ptr, int *num_text));+
−
#endif+
−
+
−
/*+
−
 *  Note while png_set_text() will accept a structure whose text,+
−
 *  language, and  translated keywords are NULL pointers, the structure+
−
 *  returned by png_get_text will always contain regular+
−
 *  zero-terminated C strings.  They might be empty strings but+
−
 *  they will never be NULL pointers.+
−
 */+
−
+
−
#if defined(PNG_TEXT_SUPPORTED)+
−
extern PNG_EXPORT(void,png_set_text) PNGARG((png_structp png_ptr,+
−
   png_infop info_ptr, png_textp text_ptr, int num_text));+
−
#endif+
−
+
−
#if defined(PNG_tIME_SUPPORTED)+
−
extern PNG_EXPORT(png_uint_32,png_get_tIME) PNGARG((png_structp png_ptr,+
−
   png_infop info_ptr, png_timep *mod_time));+
−
#endif+
−
+
−
#if defined(PNG_tIME_SUPPORTED)+
−
extern PNG_EXPORT(void,png_set_tIME) PNGARG((png_structp png_ptr,+
−
   png_infop info_ptr, png_timep mod_time));+
−
#endif+
−
+
−
#if defined(PNG_tRNS_SUPPORTED)+
−
extern PNG_EXPORT(png_uint_32,png_get_tRNS) PNGARG((png_structp png_ptr,+
−
   png_infop info_ptr, png_bytep *trans, int *num_trans,+
−
   png_color_16p *trans_values));+
−
#endif+
−
+
−
#if defined(PNG_tRNS_SUPPORTED)+
−
extern PNG_EXPORT(void,png_set_tRNS) PNGARG((png_structp png_ptr,+
−
   png_infop info_ptr, png_bytep trans, int num_trans,+
−
   png_color_16p trans_values));+
−
#endif+
−
+
−
#if defined(PNG_tRNS_SUPPORTED)+
−
#endif+
−
+
−
#if defined(PNG_sCAL_SUPPORTED)+
−
#ifdef PNG_FLOATING_POINT_SUPPORTED+
−
extern PNG_EXPORT(png_uint_32,png_get_sCAL) PNGARG((png_structp png_ptr,+
−
   png_infop info_ptr, int *unit, double *width, double *height));+
−
#else+
−
#ifdef PNG_FIXED_POINT_SUPPORTED+
−
extern PNG_EXPORT(png_uint_32,png_get_sCAL_s) PNGARG((png_structp png_ptr,+
−
   png_infop info_ptr, int *unit, png_charpp swidth, png_charpp sheight));+
−
#endif+
−
#endif+
−
#endif /* PNG_sCAL_SUPPORTED */+
−
+
−
#if defined(PNG_sCAL_SUPPORTED)+
−
#ifdef PNG_FLOATING_POINT_SUPPORTED+
−
extern PNG_EXPORT(void,png_set_sCAL) PNGARG((png_structp png_ptr,+
−
   png_infop info_ptr, int unit, double width, double height));+
−
#else+
−
#ifdef PNG_FIXED_POINT_SUPPORTED+
−
extern PNG_EXPORT(void,png_set_sCAL_s) PNGARG((png_structp png_ptr,+
−
   png_infop info_ptr, int unit, png_charp swidth, png_charp sheight));+
−
#endif+
−
#endif+
−
#endif /* PNG_sCAL_SUPPORTED || PNG_WRITE_sCAL_SUPPORTED */+
−
+
−
#ifdef PNG_HANDLE_AS_UNKNOWN_SUPPORTED+
−
/* Provide a list of chunks and how they are to be handled, if the built-in+
−
   handling or default unknown chunk handling is not desired.  Any chunks not+
−
   listed will be handled in the default manner.  The IHDR and IEND chunks+
−
   must not be listed.+
−
      keep = 0: follow default behaviour+
−
           = 1: do not keep+
−
           = 2: keep only if safe-to-copy+
−
           = 3: keep even if unsafe-to-copy+
−
*/+
−
extern PNG_EXPORT(void, png_set_keep_unknown_chunks) PNGARG((png_structp+
−
   png_ptr, int keep, png_bytep chunk_list, int num_chunks));+
−
PNG_EXPORT(int,png_handle_as_unknown) PNGARG((png_structp png_ptr, png_bytep+
−
   chunk_name));+
−
#endif+
−
#if defined(PNG_UNKNOWN_CHUNKS_SUPPORTED)+
−
extern PNG_EXPORT(void, png_set_unknown_chunks) PNGARG((png_structp png_ptr,+
−
   png_infop info_ptr, png_unknown_chunkp unknowns, int num_unknowns));+
−
extern PNG_EXPORT(void, png_set_unknown_chunk_location)+
−
   PNGARG((png_structp png_ptr, png_infop info_ptr, int chunk, int location));+
−
extern PNG_EXPORT(png_uint_32,png_get_unknown_chunks) PNGARG((png_structp+
−
   png_ptr, png_infop info_ptr, png_unknown_chunkpp entries));+
−
#endif+
−
+
−
/* Png_free_data() will turn off the "valid" flag for anything it frees.+
−
 * If you need to turn it off for a chunk that your application has freed,+
−
 * you can use png_set_invalid(png_ptr, info_ptr, PNG_INFO_CHNK);+
−
 */+
−
extern PNG_EXPORT(void, png_set_invalid) PNGARG((png_structp png_ptr,+
−
   png_infop info_ptr, int mask));+
−
+
−
#if defined(PNG_INFO_IMAGE_SUPPORTED)+
−
/* The "params" pointer is currently not used and is for future expansion. */+
−
extern PNG_EXPORT(void, png_read_png) PNGARG((png_structp png_ptr,+
−
                        png_infop info_ptr,+
−
                        int transforms,+
−
                        png_voidp params));+
−
extern PNG_EXPORT(void, png_write_png) PNGARG((png_structp png_ptr,+
−
                        png_infop info_ptr,+
−
                        int transforms,+
−
                        png_voidp params));+
−
#endif+
−
+
−
/* Define PNG_DEBUG at compile time for debugging information.  Higher+
−
 * numbers for PNG_DEBUG mean more debugging information.  This has+
−
 * only been added since version 0.95 so it is not implemented throughout+
−
 * libpng yet, but more support will be added as needed.+
−
 */+
−
#ifdef PNG_DEBUG+
−
#if (PNG_DEBUG > 0)+
−
#if !defined(PNG_DEBUG_FILE) && defined(_MSC_VER)+
−
#include <crtdbg.h>+
−
#if (PNG_DEBUG > 1)+
−
#ifndef _DEBUG+
−
#  define _DEBUG+
−
#endif+
−
#ifndef png_debug+
−
#define png_debug(l,m)  _RPT0(_CRT_WARN,m PNG_STRING_NEWLINE)+
−
#endif+
−
#ifndef png_debug1+
−
#define png_debug1(l,m,p1)  _RPT1(_CRT_WARN,m PNG_STRING_NEWLINE,p1)+
−
#endif+
−
#ifndef png_debug2+
−
#define png_debug2(l,m,p1,p2) _RPT2(_CRT_WARN,m PNG_STRING_NEWLINE,p1,p2)+
−
#endif+
−
#endif+
−
#else /* PNG_DEBUG_FILE || !_MSC_VER */+
−
#ifndef PNG_DEBUG_FILE+
−
#define PNG_DEBUG_FILE stderr+
−
#endif /* PNG_DEBUG_FILE */+
−
+
−
#if (PNG_DEBUG > 1)+
−
/* Note: ["%s"m PNG_STRING_NEWLINE] probably does not work on non-ISO+
−
 * compilers.+
−
 */+
−
#  ifdef __STDC__+
−
#    ifndef png_debug+
−
#      define png_debug(l,m) \+
−
       { \+
−
       int num_tabs=l; \+
−
       fprintf(PNG_DEBUG_FILE,"%s"m PNG_STRING_NEWLINE,(num_tabs==1 ? "\t" : \+
−
         (num_tabs==2 ? "\t\t":(num_tabs>2 ? "\t\t\t":"")))); \+
−
       }+
−
#    endif+
−
#    ifndef png_debug1+
−
#      define png_debug1(l,m,p1) \+
−
       { \+
−
       int num_tabs=l; \+
−
       fprintf(PNG_DEBUG_FILE,"%s"m PNG_STRING_NEWLINE,(num_tabs==1 ? "\t" : \+
−
         (num_tabs==2 ? "\t\t":(num_tabs>2 ? "\t\t\t":""))),p1); \+
−
       }+
−
#    endif+
−
#    ifndef png_debug2+
−
#      define png_debug2(l,m,p1,p2) \+
−
       { \+
−
       int num_tabs=l; \+
−
       fprintf(PNG_DEBUG_FILE,"%s"m PNG_STRING_NEWLINE,(num_tabs==1 ? "\t" : \+
−
         (num_tabs==2 ? "\t\t":(num_tabs>2 ? "\t\t\t":""))),p1,p2); \+
−
       }+
−
#    endif+
−
#  else /* __STDC __ */+
−
#    ifndef png_debug+
−
#      define png_debug(l,m) \+
−
       { \+
−
       int num_tabs=l; \+
−
       char format[256]; \+
−
       snprintf(format,256,"%s%s%s",(num_tabs==1 ? "\t" : \+
−
         (num_tabs==2 ? "\t\t":(num_tabs>2 ? "\t\t\t":""))), \+
−
         m,PNG_STRING_NEWLINE); \+
−
       fprintf(PNG_DEBUG_FILE,format); \+
−
       }+
−
#    endif+
−
#    ifndef png_debug1+
−
#      define png_debug1(l,m,p1) \+
−
       { \+
−
       int num_tabs=l; \+
−
       char format[256]; \+
−
       snprintf(format,256,"%s%s%s",(num_tabs==1 ? "\t" : \+
−
         (num_tabs==2 ? "\t\t":(num_tabs>2 ? "\t\t\t":""))), \+
−
         m,PNG_STRING_NEWLINE); \+
−
       fprintf(PNG_DEBUG_FILE,format,p1); \+
−
       }+
−
#    endif+
−
#    ifndef png_debug2+
−
#      define png_debug2(l,m,p1,p2) \+
−
       { \+
−
       int num_tabs=l; \+
−
       char format[256]; \+
−
       snprintf(format,256,"%s%s%s",(num_tabs==1 ? "\t" : \+
−
         (num_tabs==2 ? "\t\t":(num_tabs>2 ? "\t\t\t":""))), \+
−
         m,PNG_STRING_NEWLINE); \+
−
       fprintf(PNG_DEBUG_FILE,format,p1,p2); \+
−
       }+
−
#    endif+
−
#  endif /* __STDC __ */+
−
#endif /* (PNG_DEBUG > 1) */+
−
+
−
#endif /* _MSC_VER */+
−
#endif /* (PNG_DEBUG > 0) */+
−
#endif /* PNG_DEBUG */+
−
#ifndef png_debug+
−
#define png_debug(l, m)+
−
#endif+
−
#ifndef png_debug1+
−
#define png_debug1(l, m, p1)+
−
#endif+
−
#ifndef png_debug2+
−
#define png_debug2(l, m, p1, p2)+
−
#endif+
−
+
−
extern PNG_EXPORT(png_charp,png_get_copyright) PNGARG((png_structp png_ptr));+
−
extern PNG_EXPORT(png_charp,png_get_header_ver) PNGARG((png_structp png_ptr));+
−
extern PNG_EXPORT(png_charp,png_get_header_version) PNGARG((png_structp png_ptr));+
−
extern PNG_EXPORT(png_charp,png_get_libpng_ver) PNGARG((png_structp png_ptr));+
−
+
−
#ifdef PNG_MNG_FEATURES_SUPPORTED+
−
extern PNG_EXPORT(png_uint_32,png_permit_mng_features) PNGARG((png_structp+
−
   png_ptr, png_uint_32 mng_features_permitted));+
−
#endif+
−
+
−
/* For use in png_set_keep_unknown, added to version 1.2.6 */+
−
#define PNG_HANDLE_CHUNK_AS_DEFAULT   0+
−
#define PNG_HANDLE_CHUNK_NEVER        1+
−
#define PNG_HANDLE_CHUNK_IF_SAFE      2+
−
#define PNG_HANDLE_CHUNK_ALWAYS       3+
−
+
−
/* Added to version 1.2.0 */+
−
#if defined(PNG_ASSEMBLER_CODE_SUPPORTED)+
−
#if defined(PNG_MMX_CODE_SUPPORTED)+
−
#define PNG_ASM_FLAG_MMX_SUPPORT_COMPILED  0x01  /* not user-settable */+
−
#define PNG_ASM_FLAG_MMX_SUPPORT_IN_CPU    0x02  /* not user-settable */+
−
#define PNG_ASM_FLAG_MMX_READ_COMBINE_ROW  0x04+
−
#define PNG_ASM_FLAG_MMX_READ_INTERLACE    0x08+
−
#define PNG_ASM_FLAG_MMX_READ_FILTER_SUB   0x10+
−
#define PNG_ASM_FLAG_MMX_READ_FILTER_UP    0x20+
−
#define PNG_ASM_FLAG_MMX_READ_FILTER_AVG   0x40+
−
#define PNG_ASM_FLAG_MMX_READ_FILTER_PAETH 0x80+
−
#define PNG_ASM_FLAGS_INITIALIZED          0x80000000  /* not user-settable */+
−
+
−
#define PNG_MMX_READ_FLAGS ( PNG_ASM_FLAG_MMX_READ_COMBINE_ROW  \+
−
                           | PNG_ASM_FLAG_MMX_READ_INTERLACE    \+
−
                           | PNG_ASM_FLAG_MMX_READ_FILTER_SUB   \+
−
                           | PNG_ASM_FLAG_MMX_READ_FILTER_UP    \+
−
                           | PNG_ASM_FLAG_MMX_READ_FILTER_AVG   \+
−
                           | PNG_ASM_FLAG_MMX_READ_FILTER_PAETH )+
−
#define PNG_MMX_WRITE_FLAGS ( 0 )+
−
+
−
#define PNG_MMX_FLAGS ( PNG_ASM_FLAG_MMX_SUPPORT_COMPILED \+
−
                      | PNG_ASM_FLAG_MMX_SUPPORT_IN_CPU   \+
−
                      | PNG_MMX_READ_FLAGS                \+
−
                      | PNG_MMX_WRITE_FLAGS )+
−
+
−
#define PNG_SELECT_READ   1+
−
#define PNG_SELECT_WRITE  2+
−
#endif /* PNG_MMX_CODE_SUPPORTED */+
−
+
−
#if !defined(PNG_1_0_X)+
−
/* pngget.c */+
−
extern PNG_EXPORT(png_uint_32,png_get_mmx_flagmask)+
−
   PNGARG((int flag_select, int *compilerID));+
−
+
−
/* pngget.c */+
−
extern PNG_EXPORT(png_uint_32,png_get_asm_flagmask)+
−
   PNGARG((int flag_select));+
−
+
−
/* pngget.c */+
−
extern PNG_EXPORT(png_uint_32,png_get_asm_flags)+
−
   PNGARG((png_structp png_ptr));+
−
+
−
/* pngget.c */+
−
extern PNG_EXPORT(png_byte,png_get_mmx_bitdepth_threshold)+
−
   PNGARG((png_structp png_ptr));+
−
+
−
/* pngget.c */+
−
extern PNG_EXPORT(png_uint_32,png_get_mmx_rowbytes_threshold)+
−
   PNGARG((png_structp png_ptr));+
−
+
−
/* pngset.c */+
−
extern PNG_EXPORT(void,png_set_asm_flags)+
−
   PNGARG((png_structp png_ptr, png_uint_32 asm_flags));+
−
+
−
/* pngset.c */+
−
extern PNG_EXPORT(void,png_set_mmx_thresholds)+
−
   PNGARG((png_structp png_ptr, png_byte mmx_bitdepth_threshold,+
−
   png_uint_32 mmx_rowbytes_threshold));+
−
+
−
#endif /* PNG_1_0_X */+
−
+
−
#if !defined(PNG_1_0_X)+
−
/* png.c, pnggccrd.c, or pngvcrd.c */+
−
extern PNG_EXPORT(int,png_mmx_support) PNGARG((void));+
−
#endif /* PNG_1_0_X */+
−
#endif /* PNG_ASSEMBLER_CODE_SUPPORTED */+
−
+
−
/* Strip the prepended error numbers ("#nnn ") from error and warning+
−
 * messages before passing them to the error or warning handler.+
−
 */+
−
#ifdef PNG_ERROR_NUMBERS_SUPPORTED+
−
extern PNG_EXPORT(void,png_set_strip_error_numbers) PNGARG((png_structp+
−
   png_ptr, png_uint_32 strip_mode));+
−
#endif+
−
+
−
/* Added at libpng-1.2.6 */+
−
#ifdef PNG_SET_USER_LIMITS_SUPPORTED+
−
extern PNG_EXPORT(void,png_set_user_limits) PNGARG((png_structp+
−
   png_ptr, png_uint_32 user_width_max, png_uint_32 user_height_max));+
−
extern PNG_EXPORT(png_uint_32,png_get_user_width_max) PNGARG((png_structp+
−
   png_ptr));+
−
extern PNG_EXPORT(png_uint_32,png_get_user_height_max) PNGARG((png_structp+
−
   png_ptr));+
−
#endif+
−
+
−
+
−
/* Maintainer: Put new public prototypes here ^, in libpng.3, and in+
−
 * project defs+
−
 */+
−
+
−
#ifdef PNG_READ_COMPOSITE_NODIV_SUPPORTED+
−
/* With these routines we avoid an integer divide, which will be slower on+
−
 * most machines.  However, it does take more operations than the corresponding+
−
 * divide method, so it may be slower on a few RISC systems.  There are two+
−
 * shifts (by 8 or 16 bits) and an addition, versus a single integer divide.+
−
 *+
−
 * Note that the rounding factors are NOT supposed to be the same!  128 and+
−
 * 32768 are correct for the NODIV code; 127 and 32767 are correct for the+
−
 * standard method.+
−
 *+
−
 * [Optimized code by Greg Roelofs and Mark Adler...blame us for bugs. :-) ]+
−
 */+
−
+
−
 /* fg and bg should be in `gamma 1.0' space; alpha is the opacity          */+
−
+
−
#  define png_composite(composite, fg, alpha, bg)                            \+
−
     { png_uint_16 temp = (png_uint_16)((png_uint_16)(fg) * (png_uint_16)(alpha) \+
−
                        +        (png_uint_16)(bg)*(png_uint_16)(255 -       \+
−
                        (png_uint_16)(alpha)) + (png_uint_16)128);           \+
−
       (composite) = (png_byte)((temp + (temp >> 8)) >> 8); }+
−
+
−
#  define png_composite_16(composite, fg, alpha, bg)                         \+
−
     { png_uint_32 temp = (png_uint_32)((png_uint_32)(fg) * (png_uint_32)(alpha) \+
−
                        + (png_uint_32)(bg)*(png_uint_32)(65535L -           \+
−
                        (png_uint_32)(alpha)) + (png_uint_32)32768L);        \+
−
       (composite) = (png_uint_16)((temp + (temp >> 16)) >> 16); }+
−
+
−
#else  /* Standard method using integer division */+
−
+
−
#  define png_composite(composite, fg, alpha, bg)                            \+
−
     (composite) = (png_byte)(((png_uint_16)(fg) * (png_uint_16)(alpha) +    \+
−
       (png_uint_16)(bg) * (png_uint_16)(255 - (png_uint_16)(alpha)) +       \+
−
       (png_uint_16)127) / 255)+
−
+
−
#  define png_composite_16(composite, fg, alpha, bg)                         \+
−
     (composite) = (png_uint_16)(((png_uint_32)(fg) * (png_uint_32)(alpha) + \+
−
       (png_uint_32)(bg)*(png_uint_32)(65535L - (png_uint_32)(alpha)) +      \+
−
       (png_uint_32)32767) / (png_uint_32)65535L)+
−
+
−
#endif /* PNG_READ_COMPOSITE_NODIV_SUPPORTED */+
−
+
−
/* Inline macros to do direct reads of bytes from the input buffer.  These+
−
 * require that you are using an architecture that uses PNG byte ordering+
−
 * (MSB first) and supports unaligned data storage.  I think that PowerPC+
−
 * in big-endian mode and 680x0 are the only ones that will support this.+
−
 * The x86 line of processors definitely do not.  The png_get_int_32()+
−
 * routine also assumes we are using two's complement format for negative+
−
 * values, which is almost certainly true.+
−
 */+
−
#if defined(PNG_READ_BIG_ENDIAN_SUPPORTED)+
−
#  define png_get_uint_32(buf) ( *((png_uint_32p) (buf)))+
−
#  define png_get_uint_16(buf) ( *((png_uint_16p) (buf)))+
−
#  define png_get_int_32(buf)  ( *((png_int_32p)  (buf)))+
−
#else+
−
extern PNG_EXPORT(png_uint_32,png_get_uint_32) PNGARG((png_bytep buf));+
−
extern PNG_EXPORT(png_uint_16,png_get_uint_16) PNGARG((png_bytep buf));+
−
extern PNG_EXPORT(png_int_32,png_get_int_32) PNGARG((png_bytep buf));+
−
#endif /* !PNG_READ_BIG_ENDIAN_SUPPORTED */+
−
extern PNG_EXPORT(png_uint_32,png_get_uint_31)+
−
  PNGARG((png_structp png_ptr, png_bytep buf));+
−
/* No png_get_int_16 -- may be added if there's a real need for it. */+
−
+
−
/* Place a 32-bit number into a buffer in PNG byte order (big-endian).+
−
 */+
−
extern PNG_EXPORT(void,png_save_uint_32)+
−
   PNGARG((png_bytep buf, png_uint_32 i));+
−
extern PNG_EXPORT(void,png_save_int_32)+
−
   PNGARG((png_bytep buf, png_int_32 i));+
−
+
−
/* Place a 16-bit number into a buffer in PNG byte order.+
−
 * The parameter is declared unsigned int, not png_uint_16,+
−
 * just to avoid potential problems on pre-ANSI C compilers.+
−
 */+
−
extern PNG_EXPORT(void,png_save_uint_16)+
−
   PNGARG((png_bytep buf, unsigned int i));+
−
/* No png_save_int_16 -- may be added if there's a real need for it. */+
−
+
−
/* ************************************************************************* */+
−
+
−
/* These next functions are used internally in the code.  They generally+
−
 * shouldn't be used unless you are writing code to add or replace some+
−
 * functionality in libpng.  More information about most functions can+
−
 * be found in the files where the functions are located.+
−
 */+
−
+
−
+
−
/* Various modes of operation, that are visible to applications because+
−
 * they are used for unknown chunk location.+
−
 */+
−
#define PNG_HAVE_IHDR               0x01+
−
#define PNG_HAVE_PLTE               0x02+
−
#define PNG_HAVE_IDAT               0x04+
−
#define PNG_AFTER_IDAT              0x08 /* Have complete zlib datastream */+
−
#define PNG_HAVE_IEND               0x10+
−
+
−
#if defined(PNG_INTERNAL)+
−
+
−
/* More modes of operation.  Note that after an init, mode is set to+
−
 * zero automatically when the structure is created.+
−
 */+
−
#define PNG_HAVE_gAMA               0x20+
−
#define PNG_HAVE_cHRM               0x40+
−
#define PNG_HAVE_sRGB               0x80+
−
#define PNG_HAVE_CHUNK_HEADER      0x100+
−
#define PNG_WROTE_tIME             0x200+
−
#define PNG_WROTE_INFO_BEFORE_PLTE 0x400+
−
#define PNG_BACKGROUND_IS_GRAY     0x800+
−
#define PNG_HAVE_PNG_SIGNATURE    0x1000+
−
#define PNG_HAVE_CHUNK_AFTER_IDAT 0x2000 /* Have another chunk after IDAT */+
−
+
−
/* Flags for the transformations the PNG library does on the image data */+
−
#define PNG_BGR                0x0001+
−
#define PNG_INTERLACE          0x0002+
−
#define PNG_PACK               0x0004+
−
#define PNG_SHIFT              0x0008+
−
#define PNG_SWAP_BYTES         0x0010+
−
#define PNG_INVERT_MONO        0x0020+
−
#define PNG_DITHER             0x0040+
−
#define PNG_BACKGROUND         0x0080+
−
#define PNG_BACKGROUND_EXPAND  0x0100+
−
                          /*   0x0200 unused */+
−
#define PNG_16_TO_8            0x0400+
−
#define PNG_RGBA               0x0800+
−
#define PNG_EXPAND             0x1000+
−
#define PNG_GAMMA              0x2000+
−
#define PNG_GRAY_TO_RGB        0x4000+
−
#define PNG_FILLER             0x8000L+
−
#define PNG_PACKSWAP          0x10000L+
−
#define PNG_SWAP_ALPHA        0x20000L+
−
#define PNG_STRIP_ALPHA       0x40000L+
−
#define PNG_INVERT_ALPHA      0x80000L+
−
#define PNG_USER_TRANSFORM   0x100000L+
−
#define PNG_RGB_TO_GRAY_ERR  0x200000L+
−
#define PNG_RGB_TO_GRAY_WARN 0x400000L+
−
#define PNG_RGB_TO_GRAY      0x600000L  /* two bits, RGB_TO_GRAY_ERR|WARN */+
−
                       /*    0x800000L     Unused */+
−
#define PNG_ADD_ALPHA       0x1000000L  /* Added to libpng-1.2.7 */+
−
#define PNG_EXPAND_tRNS     0x2000000L  /* Added to libpng-1.2.9 */+
−
                       /*   0x4000000L  unused */+
−
                       /*   0x8000000L  unused */+
−
                       /*  0x10000000L  unused */+
−
                       /*  0x20000000L  unused */+
−
                       /*  0x40000000L  unused */+
−
+
−
/* Flags for png_create_struct */+
−
#define PNG_STRUCT_PNG   0x0001+
−
#define PNG_STRUCT_INFO  0x0002+
−
+
−
/* Scaling factor for filter heuristic weighting calculations */+
−
#define PNG_WEIGHT_SHIFT 8+
−
#define PNG_WEIGHT_FACTOR (1<<(PNG_WEIGHT_SHIFT))+
−
#define PNG_COST_SHIFT 3+
−
#define PNG_COST_FACTOR (1<<(PNG_COST_SHIFT))+
−
+
−
/* Flags for the png_ptr->flags rather than declaring a byte for each one */+
−
#define PNG_FLAG_ZLIB_CUSTOM_STRATEGY     0x0001+
−
#define PNG_FLAG_ZLIB_CUSTOM_LEVEL        0x0002+
−
#define PNG_FLAG_ZLIB_CUSTOM_MEM_LEVEL    0x0004+
−
#define PNG_FLAG_ZLIB_CUSTOM_WINDOW_BITS  0x0008+
−
#define PNG_FLAG_ZLIB_CUSTOM_METHOD       0x0010+
−
#define PNG_FLAG_ZLIB_FINISHED            0x0020+
−
#define PNG_FLAG_ROW_INIT                 0x0040+
−
#define PNG_FLAG_FILLER_AFTER             0x0080+
−
#define PNG_FLAG_CRC_ANCILLARY_USE        0x0100+
−
#define PNG_FLAG_CRC_ANCILLARY_NOWARN     0x0200+
−
#define PNG_FLAG_CRC_CRITICAL_USE         0x0400+
−
#define PNG_FLAG_CRC_CRITICAL_IGNORE      0x0800+
−
#define PNG_FLAG_FREE_PLTE                0x1000+
−
#define PNG_FLAG_FREE_TRNS                0x2000+
−
#define PNG_FLAG_FREE_HIST                0x4000+
−
#define PNG_FLAG_KEEP_UNKNOWN_CHUNKS      0x8000L+
−
#define PNG_FLAG_KEEP_UNSAFE_CHUNKS       0x10000L+
−
#define PNG_FLAG_LIBRARY_MISMATCH         0x20000L+
−
#define PNG_FLAG_STRIP_ERROR_NUMBERS      0x40000L+
−
#define PNG_FLAG_STRIP_ERROR_TEXT         0x80000L+
−
#define PNG_FLAG_MALLOC_NULL_MEM_OK       0x100000L+
−
#define PNG_FLAG_ADD_ALPHA                0x200000L  /* Added to libpng-1.2.8 */+
−
#define PNG_FLAG_STRIP_ALPHA              0x400000L  /* Added to libpng-1.2.8 */+
−
                                  /*      0x800000L  unused */+
−
                                  /*     0x1000000L  unused */+
−
                                  /*     0x2000000L  unused */+
−
                                  /*     0x4000000L  unused */+
−
                                  /*     0x8000000L  unused */+
−
                                  /*    0x10000000L  unused */+
−
                                  /*    0x20000000L  unused */+
−
                                  /*    0x40000000L  unused */+
−
+
−
#define PNG_FLAG_CRC_ANCILLARY_MASK (PNG_FLAG_CRC_ANCILLARY_USE | \+
−
                                     PNG_FLAG_CRC_ANCILLARY_NOWARN)+
−
+
−
#define PNG_FLAG_CRC_CRITICAL_MASK  (PNG_FLAG_CRC_CRITICAL_USE | \+
−
                                     PNG_FLAG_CRC_CRITICAL_IGNORE)+
−
+
−
#define PNG_FLAG_CRC_MASK           (PNG_FLAG_CRC_ANCILLARY_MASK | \+
−
                                     PNG_FLAG_CRC_CRITICAL_MASK)+
−
+
−
/* Save typing and make code easier to understand */+
−
+
−
#define PNG_COLOR_DIST(c1, c2) (abs((int)((c1).red) - (int)((c2).red)) + \+
−
   abs((int)((c1).green) - (int)((c2).green)) + \+
−
   abs((int)((c1).blue) - (int)((c2).blue)))+
−
+
−
/* Added to libpng-1.2.6 JB */+
−
#define PNG_ROWBYTES(pixel_bits, width) \+
−
    ((pixel_bits) >= 8 ? \+
−
    ((width) * (((png_uint_32)(pixel_bits)) >> 3)) : \+
−
    (( ((width) * ((png_uint_32)(pixel_bits))) + 7) >> 3) )+
−
+
−
/* PNG_OUT_OF_RANGE returns true if value is outside the range+
−
 * ideal-delta..ideal+delta.  Each argument is evaluated twice.+
−
 * "ideal" and "delta" should be constants, normally simple+
−
 * integers, "value" a variable. Added to libpng-1.2.6 JB+
−
 */+
−
#define PNG_OUT_OF_RANGE(value, ideal, delta) \+
−
        ( (value) < (ideal)-(delta) || (value) > (ideal)+(delta) )+
−
+
−
/* Variables declared in png.c - only it needs to define PNG_NO_EXTERN */+
−
#if !defined(PNG_NO_EXTERN) || defined(PNG_ALWAYS_EXTERN)+
−
/* Place to hold the signature string for a PNG file. */+
−
#ifdef PNG_USE_GLOBAL_ARRAYS+
−
   PNG_EXPORT_VAR (PNG_CONST png_byte FARDATA) png_sig[8];+
−
#else+
−
#endif+
−
#endif /* PNG_NO_EXTERN */+
−
+
−
/* Constant strings for known chunk types.  If you need to add a chunk,+
−
 * define the name here, and add an invocation of the macro in png.c and+
−
 * wherever it's needed.+
−
 */+
−
#define PNG_IHDR png_byte png_IHDR[5] = { 73,  72,  68,  82, '\0'}+
−
#define PNG_IDAT png_byte png_IDAT[5] = { 73,  68,  65,  84, '\0'}+
−
#define PNG_IEND png_byte png_IEND[5] = { 73,  69,  78,  68, '\0'}+
−
#define PNG_PLTE png_byte png_PLTE[5] = { 80,  76,  84,  69, '\0'}+
−
#define PNG_bKGD png_byte png_bKGD[5] = { 98,  75,  71,  68, '\0'}+
−
#define PNG_cHRM png_byte png_cHRM[5] = { 99,  72,  82,  77, '\0'}+
−
#define PNG_gAMA png_byte png_gAMA[5] = {103,  65,  77,  65, '\0'}+
−
#define PNG_hIST png_byte png_hIST[5] = {104,  73,  83,  84, '\0'}+
−
#define PNG_iCCP png_byte png_iCCP[5] = {105,  67,  67,  80, '\0'}+
−
#define PNG_iTXt png_byte png_iTXt[5] = {105,  84,  88, 116, '\0'}+
−
#define PNG_oFFs png_byte png_oFFs[5] = {111,  70,  70, 115, '\0'}+
−
#define PNG_pCAL png_byte png_pCAL[5] = {112,  67,  65,  76, '\0'}+
−
#define PNG_sCAL png_byte png_sCAL[5] = {115,  67,  65,  76, '\0'}+
−
#define PNG_pHYs png_byte png_pHYs[5] = {112,  72,  89, 115, '\0'}+
−
#define PNG_sBIT png_byte png_sBIT[5] = {115,  66,  73,  84, '\0'}+
−
#define PNG_sPLT png_byte png_sPLT[5] = {115,  80,  76,  84, '\0'}+
−
#define PNG_sRGB png_byte png_sRGB[5] = {115,  82,  71,  66, '\0'}+
−
#define PNG_tEXt png_byte png_tEXt[5] = {116,  69,  88, 116, '\0'}+
−
#define PNG_tIME png_byte png_tIME[5] = {116,  73,  77,  69, '\0'}+
−
#define PNG_tRNS png_byte png_tRNS[5] = {116,  82,  78,  83, '\0'}+
−
#define PNG_zTXt png_byte png_zTXt[5] = {122,  84,  88, 116, '\0'}+
−
+
−
#ifdef PNG_USE_GLOBAL_ARRAYS+
−
PNG_EXPORT_VAR (png_byte FARDATA) png_IHDR[5];+
−
PNG_EXPORT_VAR (png_byte FARDATA) png_IDAT[5];+
−
PNG_EXPORT_VAR (png_byte FARDATA) png_IEND[5];+
−
PNG_EXPORT_VAR (png_byte FARDATA) png_PLTE[5];+
−
PNG_EXPORT_VAR (png_byte FARDATA) png_bKGD[5];+
−
PNG_EXPORT_VAR (png_byte FARDATA) png_cHRM[5];+
−
PNG_EXPORT_VAR (png_byte FARDATA) png_gAMA[5];+
−
PNG_EXPORT_VAR (png_byte FARDATA) png_hIST[5];+
−
PNG_EXPORT_VAR (png_byte FARDATA) png_iCCP[5];+
−
PNG_EXPORT_VAR (png_byte FARDATA) png_iTXt[5];+
−
PNG_EXPORT_VAR (png_byte FARDATA) png_oFFs[5];+
−
PNG_EXPORT_VAR (png_byte FARDATA) png_pCAL[5];+
−
PNG_EXPORT_VAR (png_byte FARDATA) png_sCAL[5];+
−
PNG_EXPORT_VAR (png_byte FARDATA) png_pHYs[5];+
−
PNG_EXPORT_VAR (png_byte FARDATA) png_sBIT[5];+
−
PNG_EXPORT_VAR (png_byte FARDATA) png_sPLT[5];+
−
PNG_EXPORT_VAR (png_byte FARDATA) png_sRGB[5];+
−
PNG_EXPORT_VAR (png_byte FARDATA) png_tEXt[5];+
−
PNG_EXPORT_VAR (png_byte FARDATA) png_tIME[5];+
−
PNG_EXPORT_VAR (png_byte FARDATA) png_tRNS[5];+
−
PNG_EXPORT_VAR (png_byte FARDATA) png_zTXt[5];+
−
#endif /* PNG_USE_GLOBAL_ARRAYS */+
−
+
−
#if defined(PNG_1_0_X) || defined (PNG_1_2_X)+
−
/* Initialize png_ptr struct for reading, and allocate any other memory.+
−
 * (old interface - DEPRECATED - use png_create_read_struct instead).+
−
 */+
−
extern PNG_EXPORT(void,png_read_init) PNGARG((png_structp png_ptr));+
−
#undef png_read_init+
−
#define png_read_init(png_ptr) png_read_init_3(&png_ptr, \+
−
    PNG_LIBPNG_VER_STRING,  png_sizeof(png_struct));+
−
#endif+
−
+
−
extern PNG_EXPORT(void,png_read_init_3) PNGARG((png_structpp ptr_ptr,+
−
    png_const_charp user_png_ver, png_size_t png_struct_size));+
−
#if defined(PNG_1_0_X) || defined (PNG_1_2_X)+
−
extern PNG_EXPORT(void,png_read_init_2) PNGARG((png_structp png_ptr,+
−
    png_const_charp user_png_ver, png_size_t png_struct_size, png_size_t+
−
    png_info_size));+
−
#endif+
−
+
−
#if defined(PNG_1_0_X) || defined (PNG_1_2_X)+
−
/* Initialize png_ptr struct for writing, and allocate any other memory.+
−
 * (old interface - DEPRECATED - use png_create_write_struct instead).+
−
 */+
−
extern PNG_EXPORT(void,png_write_init) PNGARG((png_structp png_ptr));+
−
#undef png_write_init+
−
#define png_write_init(png_ptr) png_write_init_3(&png_ptr, \+
−
    PNG_LIBPNG_VER_STRING, png_sizeof(png_struct));+
−
#endif+
−
+
−
extern PNG_EXPORT(void,png_write_init_3) PNGARG((png_structpp ptr_ptr,+
−
    png_const_charp user_png_ver, png_size_t png_struct_size));+
−
extern PNG_EXPORT(void,png_write_init_2) PNGARG((png_structp png_ptr,+
−
    png_const_charp user_png_ver, png_size_t png_struct_size, png_size_t+
−
    png_info_size));+
−
+
−
/* Allocate memory for an internal libpng struct */+
−
PNG_EXTERN png_voidp png_create_struct PNGARG((int type));+
−
+
−
/* Free memory from internal libpng struct */+
−
PNG_EXTERN void png_destroy_struct PNGARG((png_voidp struct_ptr));+
−
+
−
PNG_EXTERN png_voidp png_create_struct_2 PNGARG((int type, png_malloc_ptr+
−
  malloc_fn, png_voidp mem_ptr));+
−
PNG_EXTERN void png_destroy_struct_2 PNGARG((png_voidp struct_ptr,+
−
   png_free_ptr free_fn, png_voidp mem_ptr));+
−
+
−
/* Free any memory that info_ptr points to and reset struct. */+
−
PNG_EXTERN void png_info_destroy PNGARG((png_structp png_ptr,+
−
   png_infop info_ptr));+
−
+
−
#ifndef PNG_1_0_X+
−
/* Function to allocate memory for zlib. */+
−
PNG_EXTERN voidpf png_zalloc PNGARG((voidpf png_ptr, uInt items, uInt size));+
−
+
−
/* Function to free memory for zlib */+
−
PNG_EXTERN void png_zfree PNGARG((voidpf png_ptr, voidpf ptr));+
−
+
−
#ifdef PNG_SIZE_T+
−
/* Function to convert a sizeof an item to png_sizeof item */+
−
   PNG_EXTERN png_size_t PNGAPI png_convert_size PNGARG((size_t size));+
−
#endif+
−
+
−
/* Next four functions are used internally as callbacks.  PNGAPI is required+
−
 * but not PNG_EXPORT.  PNGAPI added at libpng version 1.2.3.+
−
 */+
−
+
−
PNG_EXTERN void PNGAPI png_default_read_data PNGARG((png_structp png_ptr,+
−
   png_bytep data, png_size_t length));+
−
+
−
#ifdef PNG_PROGRESSIVE_READ_SUPPORTED+
−
PNG_EXTERN void PNGAPI png_push_fill_buffer PNGARG((png_structp png_ptr,+
−
   png_bytep buffer, png_size_t length));+
−
#endif+
−
+
−
PNG_EXTERN void PNGAPI png_default_write_data PNGARG((png_structp png_ptr,+
−
   png_bytep data, png_size_t length));+
−
+
−
#if defined(PNG_WRITE_FLUSH_SUPPORTED)+
−
#if !defined(PNG_NO_STDIO)+
−
PNG_EXTERN void PNGAPI png_default_flush PNGARG((png_structp png_ptr));+
−
#endif+
−
#endif+
−
#else /* PNG_1_0_X */+
−
#ifdef PNG_PROGRESSIVE_READ_SUPPORTED+
−
PNG_EXTERN void png_push_fill_buffer PNGARG((png_structp png_ptr,+
−
   png_bytep buffer, png_size_t length));+
−
#endif+
−
#endif /* PNG_1_0_X */+
−
+
−
/* Reset the CRC variable */+
−
PNG_EXTERN void png_reset_crc PNGARG((png_structp png_ptr));+
−
+
−
/* Write the "data" buffer to whatever output you are using. */+
−
PNG_EXTERN void png_write_data PNGARG((png_structp png_ptr, png_bytep data,+
−
   png_size_t length));+
−
+
−
/* Read data from whatever input you are using into the "data" buffer */+
−
PNG_EXTERN void png_read_data PNGARG((png_structp png_ptr, png_bytep data,+
−
   png_size_t length));+
−
+
−
/* Read bytes into buf, and update png_ptr->crc */+
−
PNG_EXTERN void png_crc_read PNGARG((png_structp png_ptr, png_bytep buf,+
−
   png_size_t length));+
−
+
−
/* Decompress data in a chunk that uses compression */+
−
#if defined(PNG_zTXt_SUPPORTED) || defined(PNG_iTXt_SUPPORTED) || \+
−
    defined(PNG_iCCP_SUPPORTED) || defined(PNG_sPLT_SUPPORTED)+
−
PNG_EXTERN void png_decompress_chunk PNGARG((png_structp png_ptr,+
−
   int comp_type, png_size_t chunklength,+
−
   png_size_t prefix_length, png_size_t *data_length));+
−
#endif+
−
+
−
/* Read "skip" bytes, read the file crc, and (optionally) verify png_ptr->crc */+
−
PNG_EXTERN int png_crc_finish PNGARG((png_structp png_ptr, png_uint_32 skip));+
−
+
−
/* Read the CRC from the file and compare it to the libpng calculated CRC */+
−
PNG_EXTERN int png_crc_error PNGARG((png_structp png_ptr));+
−
+
−
/* Calculate the CRC over a section of data.  Note that we are only+
−
 * passing a maximum of 64K on systems that have this as a memory limit,+
−
 * since this is the maximum buffer size we can specify.+
−
 */+
−
PNG_EXTERN void png_calculate_crc PNGARG((png_structp png_ptr, png_bytep ptr,+
−
   png_size_t length));+
−
+
−
#if defined(PNG_WRITE_FLUSH_SUPPORTED)+
−
PNG_EXTERN void png_flush PNGARG((png_structp png_ptr));+
−
#endif+
−
+
−
/* Simple function to write the signature */+
−
PNG_EXTERN void png_write_sig PNGARG((png_structp png_ptr));+
−
+
−
/* Write various chunks */+
−
+
−
/* Write the IHDR chunk, and update the png_struct with the necessary+
−
 * information.+
−
 */+
−
PNG_EXTERN void png_write_IHDR PNGARG((png_structp png_ptr, png_uint_32 width,+
−
   png_uint_32 height,+
−
   int bit_depth, int color_type, int compression_method, int filter_method,+
−
   int interlace_method));+
−
+
−
PNG_EXTERN void png_write_PLTE PNGARG((png_structp png_ptr, png_colorp palette,+
−
   png_uint_32 num_pal));+
−
+
−
PNG_EXTERN void png_write_IDAT PNGARG((png_structp png_ptr, png_bytep data,+
−
   png_size_t length));+
−
+
−
PNG_EXTERN void png_write_IEND PNGARG((png_structp png_ptr));+
−
+
−
#if defined(PNG_WRITE_gAMA_SUPPORTED)+
−
#ifdef PNG_FLOATING_POINT_SUPPORTED+
−
PNG_EXTERN void png_write_gAMA PNGARG((png_structp png_ptr, double file_gamma));+
−
#endif+
−
#ifdef PNG_FIXED_POINT_SUPPORTED+
−
PNG_EXTERN void png_write_gAMA_fixed PNGARG((png_structp png_ptr, png_fixed_point+
−
    file_gamma));+
−
#endif+
−
#endif+
−
+
−
#if defined(PNG_WRITE_sBIT_SUPPORTED)+
−
PNG_EXTERN void png_write_sBIT PNGARG((png_structp png_ptr, png_color_8p sbit,+
−
   int color_type));+
−
#endif+
−
+
−
#if defined(PNG_WRITE_cHRM_SUPPORTED)+
−
#ifdef PNG_FLOATING_POINT_SUPPORTED+
−
PNG_EXTERN void png_write_cHRM PNGARG((png_structp png_ptr,+
−
   double white_x, double white_y,+
−
   double red_x, double red_y, double green_x, double green_y,+
−
   double blue_x, double blue_y));+
−
#endif+
−
#ifdef PNG_FIXED_POINT_SUPPORTED+
−
PNG_EXTERN void png_write_cHRM_fixed PNGARG((png_structp png_ptr,+
−
   png_fixed_point int_white_x, png_fixed_point int_white_y,+
−
   png_fixed_point int_red_x, png_fixed_point int_red_y, png_fixed_point+
−
   int_green_x, png_fixed_point int_green_y, png_fixed_point int_blue_x,+
−
   png_fixed_point int_blue_y));+
−
#endif+
−
#endif+
−
+
−
#if defined(PNG_WRITE_sRGB_SUPPORTED)+
−
PNG_EXTERN void png_write_sRGB PNGARG((png_structp png_ptr,+
−
   int intent));+
−
#endif+
−
+
−
#if defined(PNG_WRITE_iCCP_SUPPORTED)+
−
PNG_EXTERN void png_write_iCCP PNGARG((png_structp png_ptr,+
−
   png_charp name, int compression_type,+
−
   png_charp profile, int proflen));+
−
   /* Note to maintainer: profile should be png_bytep */+
−
#endif+
−
+
−
#if defined(PNG_WRITE_sPLT_SUPPORTED)+
−
PNG_EXTERN void png_write_sPLT PNGARG((png_structp png_ptr,+
−
   png_sPLT_tp palette));+
−
#endif+
−
+
−
#if defined(PNG_WRITE_tRNS_SUPPORTED)+
−
PNG_EXTERN void png_write_tRNS PNGARG((png_structp png_ptr, png_bytep trans,+
−
   png_color_16p values, int number, int color_type));+
−
#endif+
−
+
−
#if defined(PNG_WRITE_bKGD_SUPPORTED)+
−
PNG_EXTERN void png_write_bKGD PNGARG((png_structp png_ptr,+
−
   png_color_16p values, int color_type));+
−
#endif+
−
+
−
#if defined(PNG_WRITE_hIST_SUPPORTED)+
−
PNG_EXTERN void png_write_hIST PNGARG((png_structp png_ptr, png_uint_16p hist,+
−
   int num_hist));+
−
#endif+
−
+
−
#if defined(PNG_WRITE_TEXT_SUPPORTED) || defined(PNG_WRITE_pCAL_SUPPORTED) || \+
−
    defined(PNG_WRITE_iCCP_SUPPORTED) || defined(PNG_WRITE_sPLT_SUPPORTED)+
−
PNG_EXTERN png_size_t png_check_keyword PNGARG((png_structp png_ptr,+
−
   png_charp key, png_charpp new_key));+
−
#endif+
−
+
−
#if defined(PNG_WRITE_tEXt_SUPPORTED)+
−
PNG_EXTERN void png_write_tEXt PNGARG((png_structp png_ptr, png_charp key,+
−
   png_charp text, png_size_t text_len));+
−
#endif+
−
+
−
#if defined(PNG_WRITE_zTXt_SUPPORTED)+
−
PNG_EXTERN void png_write_zTXt PNGARG((png_structp png_ptr, png_charp key,+
−
   png_charp text, png_size_t text_len, int compression));+
−
#endif+
−
+
−
#if defined(PNG_WRITE_iTXt_SUPPORTED)+
−
PNG_EXTERN void png_write_iTXt PNGARG((png_structp png_ptr,+
−
   int compression, png_charp key, png_charp lang, png_charp lang_key,+
−
   png_charp text));+
−
#endif+
−
+
−
#if defined(PNG_TEXT_SUPPORTED)  /* Added at version 1.0.14 and 1.2.4 */+
−
PNG_EXTERN int png_set_text_2 PNGARG((png_structp png_ptr,+
−
   png_infop info_ptr, png_textp text_ptr, int num_text));+
−
#endif+
−
+
−
#if defined(PNG_WRITE_oFFs_SUPPORTED)+
−
PNG_EXTERN void png_write_oFFs PNGARG((png_structp png_ptr,+
−
   png_int_32 x_offset, png_int_32 y_offset, int unit_type));+
−
#endif+
−
+
−
#if defined(PNG_WRITE_pCAL_SUPPORTED)+
−
PNG_EXTERN void png_write_pCAL PNGARG((png_structp png_ptr, png_charp purpose,+
−
   png_int_32 X0, png_int_32 X1, int type, int nparams,+
−
   png_charp units, png_charpp params));+
−
#endif+
−
+
−
#if defined(PNG_WRITE_pHYs_SUPPORTED)+
−
PNG_EXTERN void png_write_pHYs PNGARG((png_structp png_ptr,+
−
   png_uint_32 x_pixels_per_unit, png_uint_32 y_pixels_per_unit,+
−
   int unit_type));+
−
#endif+
−
+
−
#if defined(PNG_WRITE_tIME_SUPPORTED)+
−
PNG_EXTERN void png_write_tIME PNGARG((png_structp png_ptr,+
−
   png_timep mod_time));+
−
#endif+
−
+
−
#if defined(PNG_WRITE_sCAL_SUPPORTED)+
−
#if defined(PNG_FLOATING_POINT_SUPPORTED) && !defined(PNG_NO_STDIO)+
−
PNG_EXTERN void png_write_sCAL PNGARG((png_structp png_ptr,+
−
   int unit, double width, double height));+
−
#else+
−
#ifdef PNG_FIXED_POINT_SUPPORTED+
−
PNG_EXTERN void png_write_sCAL_s PNGARG((png_structp png_ptr,+
−
   int unit, png_charp width, png_charp height));+
−
#endif+
−
#endif+
−
#endif+
−
+
−
/* Called when finished processing a row of data */+
−
PNG_EXTERN void png_write_finish_row PNGARG((png_structp png_ptr));+
−
+
−
/* Internal use only.   Called before first row of data */+
−
PNG_EXTERN void png_write_start_row PNGARG((png_structp png_ptr));+
−
+
−
#if defined(PNG_READ_GAMMA_SUPPORTED)+
−
PNG_EXTERN void png_build_gamma_table PNGARG((png_structp png_ptr));+
−
#endif+
−
+
−
/* Combine a row of data, dealing with alpha, etc. if requested */+
−
PNG_EXTERN void png_combine_row PNGARG((png_structp png_ptr, png_bytep row,+
−
   int mask));+
−
+
−
#if defined(PNG_READ_INTERLACING_SUPPORTED)+
−
/* Expand an interlaced row */+
−
/* OLD pre-1.0.9 interface:+
−
PNG_EXTERN void png_do_read_interlace PNGARG((png_row_infop row_info,+
−
   png_bytep row, int pass, png_uint_32 transformations));+
−
 */+
−
PNG_EXTERN void png_do_read_interlace PNGARG((png_structp png_ptr));+
−
#endif+
−
+
−
/* GRR TO DO (2.0 or whenever):  simplify other internal calling interfaces */+
−
+
−
#if defined(PNG_WRITE_INTERLACING_SUPPORTED)+
−
/* Grab pixels out of a row for an interlaced pass */+
−
PNG_EXTERN void png_do_write_interlace PNGARG((png_row_infop row_info,+
−
   png_bytep row, int pass));+
−
#endif+
−
+
−
/* Unfilter a row */+
−
PNG_EXTERN void png_read_filter_row PNGARG((png_structp png_ptr,+
−
   png_row_infop row_info, png_bytep row, png_bytep prev_row, int filter));+
−
+
−
/* Choose the best filter to use and filter the row data */+
−
PNG_EXTERN void png_write_find_filter PNGARG((png_structp png_ptr,+
−
   png_row_infop row_info));+
−
+
−
/* Write out the filtered row. */+
−
PNG_EXTERN void png_write_filtered_row PNGARG((png_structp png_ptr,+
−
   png_bytep filtered_row));+
−
/* Finish a row while reading, dealing with interlacing passes, etc. */+
−
PNG_EXTERN void png_read_finish_row PNGARG((png_structp png_ptr));+
−
+
−
/* Initialize the row buffers, etc. */+
−
PNG_EXTERN void png_read_start_row PNGARG((png_structp png_ptr));+
−
/* Optional call to update the users info structure */+
−
PNG_EXTERN void png_read_transform_info PNGARG((png_structp png_ptr,+
−
   png_infop info_ptr));+
−
+
−
/* These are the functions that do the transformations */+
−
#if defined(PNG_READ_FILLER_SUPPORTED)+
−
PNG_EXTERN void png_do_read_filler PNGARG((png_row_infop row_info,+
−
   png_bytep row, png_uint_32 filler, png_uint_32 flags));+
−
#endif+
−
+
−
#if defined(PNG_READ_SWAP_ALPHA_SUPPORTED)+
−
PNG_EXTERN void png_do_read_swap_alpha PNGARG((png_row_infop row_info,+
−
   png_bytep row));+
−
#endif+
−
+
−
#if defined(PNG_WRITE_SWAP_ALPHA_SUPPORTED)+
−
PNG_EXTERN void png_do_write_swap_alpha PNGARG((png_row_infop row_info,+
−
   png_bytep row));+
−
#endif+
−
+
−
#if defined(PNG_READ_INVERT_ALPHA_SUPPORTED)+
−
PNG_EXTERN void png_do_read_invert_alpha PNGARG((png_row_infop row_info,+
−
   png_bytep row));+
−
#endif+
−
+
−
#if defined(PNG_WRITE_INVERT_ALPHA_SUPPORTED)+
−
PNG_EXTERN void png_do_write_invert_alpha PNGARG((png_row_infop row_info,+
−
   png_bytep row));+
−
#endif+
−
+
−
#if defined(PNG_WRITE_FILLER_SUPPORTED) || \+
−
    defined(PNG_READ_STRIP_ALPHA_SUPPORTED)+
−
PNG_EXTERN void png_do_strip_filler PNGARG((png_row_infop row_info,+
−
   png_bytep row, png_uint_32 flags));+
−
#endif+
−
+
−
#if defined(PNG_READ_SWAP_SUPPORTED) || defined(PNG_WRITE_SWAP_SUPPORTED)+
−
PNG_EXTERN void png_do_swap PNGARG((png_row_infop row_info, png_bytep row));+
−
#endif+
−
+
−
#if defined(PNG_READ_PACKSWAP_SUPPORTED) || defined(PNG_WRITE_PACKSWAP_SUPPORTED)+
−
PNG_EXTERN void png_do_packswap PNGARG((png_row_infop row_info, png_bytep row));+
−
#endif+
−
+
−
#if defined(PNG_READ_RGB_TO_GRAY_SUPPORTED)+
−
PNG_EXTERN int png_do_rgb_to_gray PNGARG((png_structp png_ptr, png_row_infop+
−
   row_info, png_bytep row));+
−
#endif+
−
+
−
#if defined(PNG_READ_GRAY_TO_RGB_SUPPORTED)+
−
PNG_EXTERN void png_do_gray_to_rgb PNGARG((png_row_infop row_info,+
−
   png_bytep row));+
−
#endif+
−
+
−
#if defined(PNG_READ_PACK_SUPPORTED)+
−
PNG_EXTERN void png_do_unpack PNGARG((png_row_infop row_info, png_bytep row));+
−
#endif+
−
+
−
#if defined(PNG_READ_SHIFT_SUPPORTED)+
−
PNG_EXTERN void png_do_unshift PNGARG((png_row_infop row_info, png_bytep row,+
−
   png_color_8p sig_bits));+
−
#endif+
−
+
−
#if defined(PNG_READ_INVERT_SUPPORTED) || defined(PNG_WRITE_INVERT_SUPPORTED)+
−
PNG_EXTERN void png_do_invert PNGARG((png_row_infop row_info, png_bytep row));+
−
#endif+
−
+
−
#if defined(PNG_READ_16_TO_8_SUPPORTED)+
−
PNG_EXTERN void png_do_chop PNGARG((png_row_infop row_info, png_bytep row));+
−
#endif+
−
+
−
#if defined(PNG_READ_DITHER_SUPPORTED)+
−
PNG_EXTERN void png_do_dither PNGARG((png_row_infop row_info,+
−
   png_bytep row, png_bytep palette_lookup, png_bytep dither_lookup));+
−
+
−
#  if defined(PNG_CORRECT_PALETTE_SUPPORTED)+
−
PNG_EXTERN void png_correct_palette PNGARG((png_structp png_ptr,+
−
   png_colorp palette, int num_palette));+
−
#  endif+
−
#endif+
−
+
−
#if defined(PNG_READ_BGR_SUPPORTED) || defined(PNG_WRITE_BGR_SUPPORTED)+
−
PNG_EXTERN void png_do_bgr PNGARG((png_row_infop row_info, png_bytep row));+
−
#endif+
−
+
−
#if defined(PNG_WRITE_PACK_SUPPORTED)+
−
PNG_EXTERN void png_do_pack PNGARG((png_row_infop row_info,+
−
   png_bytep row, png_uint_32 bit_depth));+
−
#endif+
−
+
−
#if defined(PNG_WRITE_SHIFT_SUPPORTED)+
−
PNG_EXTERN void png_do_shift PNGARG((png_row_infop row_info, png_bytep row,+
−
   png_color_8p bit_depth));+
−
#endif+
−
+
−
#if defined(PNG_READ_BACKGROUND_SUPPORTED)+
−
#if defined(PNG_READ_GAMMA_SUPPORTED)+
−
PNG_EXTERN void png_do_background PNGARG((png_row_infop row_info, png_bytep row,+
−
   png_color_16p trans_values, png_color_16p background,+
−
   png_color_16p background_1,+
−
   png_bytep gamma_table, png_bytep gamma_from_1, png_bytep gamma_to_1,+
−
   png_uint_16pp gamma_16, png_uint_16pp gamma_16_from_1,+
−
   png_uint_16pp gamma_16_to_1, int gamma_shift));+
−
#else+
−
PNG_EXTERN void png_do_background PNGARG((png_row_infop row_info, png_bytep row,+
−
   png_color_16p trans_values, png_color_16p background));+
−
#endif+
−
#endif+
−
+
−
#if defined(PNG_READ_GAMMA_SUPPORTED)+
−
PNG_EXTERN void png_do_gamma PNGARG((png_row_infop row_info, png_bytep row,+
−
   png_bytep gamma_table, png_uint_16pp gamma_16_table,+
−
   int gamma_shift));+
−
#endif+
−
+
−
#if defined(PNG_READ_EXPAND_SUPPORTED)+
−
PNG_EXTERN void png_do_expand_palette PNGARG((png_row_infop row_info,+
−
   png_bytep row, png_colorp palette, png_bytep trans, int num_trans));+
−
PNG_EXTERN void png_do_expand PNGARG((png_row_infop row_info,+
−
   png_bytep row, png_color_16p trans_value));+
−
#endif+
−
+
−
/* The following decodes the appropriate chunks, and does error correction,+
−
 * then calls the appropriate callback for the chunk if it is valid.+
−
 */+
−
+
−
/* Decode the IHDR chunk */+
−
PNG_EXTERN void png_handle_IHDR PNGARG((png_structp png_ptr, png_infop info_ptr,+
−
   png_uint_32 length));+
−
PNG_EXTERN void png_handle_PLTE PNGARG((png_structp png_ptr, png_infop info_ptr,+
−
   png_uint_32 length));+
−
PNG_EXTERN void png_handle_IEND PNGARG((png_structp png_ptr, png_infop info_ptr,+
−
   png_uint_32 length));+
−
+
−
#if defined(PNG_READ_bKGD_SUPPORTED)+
−
PNG_EXTERN void png_handle_bKGD PNGARG((png_structp png_ptr, png_infop info_ptr,+
−
   png_uint_32 length));+
−
#endif+
−
+
−
#if defined(PNG_READ_cHRM_SUPPORTED)+
−
PNG_EXTERN void png_handle_cHRM PNGARG((png_structp png_ptr, png_infop info_ptr,+
−
   png_uint_32 length));+
−
#endif+
−
+
−
#if defined(PNG_READ_gAMA_SUPPORTED)+
−
PNG_EXTERN void png_handle_gAMA PNGARG((png_structp png_ptr, png_infop info_ptr,+
−
   png_uint_32 length));+
−
#endif+
−
+
−
#if defined(PNG_READ_hIST_SUPPORTED)+
−
PNG_EXTERN void png_handle_hIST PNGARG((png_structp png_ptr, png_infop info_ptr,+
−
   png_uint_32 length));+
−
#endif+
−
+
−
#if defined(PNG_READ_iCCP_SUPPORTED)+
−
extern void png_handle_iCCP PNGARG((png_structp png_ptr, png_infop info_ptr,+
−
   png_uint_32 length));+
−
#endif /* PNG_READ_iCCP_SUPPORTED */+
−
+
−
#if defined(PNG_READ_iTXt_SUPPORTED)+
−
PNG_EXTERN void png_handle_iTXt PNGARG((png_structp png_ptr, png_infop info_ptr,+
−
   png_uint_32 length));+
−
#endif+
−
+
−
#if defined(PNG_READ_oFFs_SUPPORTED)+
−
PNG_EXTERN void png_handle_oFFs PNGARG((png_structp png_ptr, png_infop info_ptr,+
−
   png_uint_32 length));+
−
#endif+
−
+
−
#if defined(PNG_READ_pCAL_SUPPORTED)+
−
PNG_EXTERN void png_handle_pCAL PNGARG((png_structp png_ptr, png_infop info_ptr,+
−
   png_uint_32 length));+
−
#endif+
−
+
−
#if defined(PNG_READ_pHYs_SUPPORTED)+
−
PNG_EXTERN void png_handle_pHYs PNGARG((png_structp png_ptr, png_infop info_ptr,+
−
   png_uint_32 length));+
−
#endif+
−
+
−
#if defined(PNG_READ_sBIT_SUPPORTED)+
−
PNG_EXTERN void png_handle_sBIT PNGARG((png_structp png_ptr, png_infop info_ptr,+
−
   png_uint_32 length));+
−
#endif+
−
+
−
#if defined(PNG_READ_sCAL_SUPPORTED)+
−
PNG_EXTERN void png_handle_sCAL PNGARG((png_structp png_ptr, png_infop info_ptr,+
−
   png_uint_32 length));+
−
#endif+
−
+
−
#if defined(PNG_READ_sPLT_SUPPORTED)+
−
extern void png_handle_sPLT PNGARG((png_structp png_ptr, png_infop info_ptr,+
−
   png_uint_32 length));+
−
#endif /* PNG_READ_sPLT_SUPPORTED */+
−
+
−
#if defined(PNG_READ_sRGB_SUPPORTED)+
−
PNG_EXTERN void png_handle_sRGB PNGARG((png_structp png_ptr, png_infop info_ptr,+
−
   png_uint_32 length));+
−
#endif+
−
+
−
#if defined(PNG_READ_tEXt_SUPPORTED)+
−
PNG_EXTERN void png_handle_tEXt PNGARG((png_structp png_ptr, png_infop info_ptr,+
−
   png_uint_32 length));+
−
#endif+
−
+
−
#if defined(PNG_READ_tIME_SUPPORTED)+
−
PNG_EXTERN void png_handle_tIME PNGARG((png_structp png_ptr, png_infop info_ptr,+
−
   png_uint_32 length));+
−
#endif+
−
+
−
#if defined(PNG_READ_tRNS_SUPPORTED)+
−
PNG_EXTERN void png_handle_tRNS PNGARG((png_structp png_ptr, png_infop info_ptr,+
−
   png_uint_32 length));+
−
#endif+
−
+
−
#if defined(PNG_READ_zTXt_SUPPORTED)+
−
PNG_EXTERN void png_handle_zTXt PNGARG((png_structp png_ptr, png_infop info_ptr,+
−
   png_uint_32 length));+
−
#endif+
−
+
−
PNG_EXTERN void png_handle_unknown PNGARG((png_structp png_ptr,+
−
   png_infop info_ptr, png_uint_32 length));+
−
+
−
PNG_EXTERN void png_check_chunk_name PNGARG((png_structp png_ptr,+
−
   png_bytep chunk_name));+
−
+
−
/* Handle the transformations for reading and writing */+
−
PNG_EXTERN void png_do_read_transformations PNGARG((png_structp png_ptr));+
−
PNG_EXTERN void png_do_write_transformations PNGARG((png_structp png_ptr));+
−
+
−
PNG_EXTERN void png_init_read_transformations PNGARG((png_structp png_ptr));+
−
+
−
#ifdef PNG_PROGRESSIVE_READ_SUPPORTED+
−
PNG_EXTERN void png_push_read_chunk PNGARG((png_structp png_ptr,+
−
   png_infop info_ptr));+
−
PNG_EXTERN void png_push_read_sig PNGARG((png_structp png_ptr,+
−
   png_infop info_ptr));+
−
PNG_EXTERN void png_push_check_crc PNGARG((png_structp png_ptr));+
−
PNG_EXTERN void png_push_crc_skip PNGARG((png_structp png_ptr,+
−
   png_uint_32 length));+
−
PNG_EXTERN void png_push_crc_finish PNGARG((png_structp png_ptr));+
−
PNG_EXTERN void png_push_save_buffer PNGARG((png_structp png_ptr));+
−
PNG_EXTERN void png_push_restore_buffer PNGARG((png_structp png_ptr,+
−
   png_bytep buffer, png_size_t buffer_length));+
−
PNG_EXTERN void png_push_read_IDAT PNGARG((png_structp png_ptr));+
−
PNG_EXTERN void png_process_IDAT_data PNGARG((png_structp png_ptr,+
−
   png_bytep buffer, png_size_t buffer_length));+
−
PNG_EXTERN void png_push_process_row PNGARG((png_structp png_ptr));+
−
PNG_EXTERN void png_push_handle_unknown PNGARG((png_structp png_ptr,+
−
   png_infop info_ptr, png_uint_32 length));+
−
PNG_EXTERN void png_push_have_info PNGARG((png_structp png_ptr,+
−
   png_infop info_ptr));+
−
PNG_EXTERN void png_push_have_end PNGARG((png_structp png_ptr,+
−
   png_infop info_ptr));+
−
PNG_EXTERN void png_push_have_row PNGARG((png_structp png_ptr, png_bytep row));+
−
PNG_EXTERN void png_push_read_end PNGARG((png_structp png_ptr,+
−
   png_infop info_ptr));+
−
PNG_EXTERN void png_process_some_data PNGARG((png_structp png_ptr,+
−
   png_infop info_ptr));+
−
PNG_EXTERN void png_read_push_finish_row PNGARG((png_structp png_ptr));+
−
#if defined(PNG_READ_tEXt_SUPPORTED)+
−
PNG_EXTERN void png_push_handle_tEXt PNGARG((png_structp png_ptr,+
−
   png_infop info_ptr, png_uint_32 length));+
−
PNG_EXTERN void png_push_read_tEXt PNGARG((png_structp png_ptr,+
−
   png_infop info_ptr));+
−
#endif+
−
#if defined(PNG_READ_zTXt_SUPPORTED)+
−
PNG_EXTERN void png_push_handle_zTXt PNGARG((png_structp png_ptr,+
−
   png_infop info_ptr, png_uint_32 length));+
−
PNG_EXTERN void png_push_read_zTXt PNGARG((png_structp png_ptr,+
−
   png_infop info_ptr));+
−
#endif+
−
#if defined(PNG_READ_iTXt_SUPPORTED)+
−
PNG_EXTERN void png_push_handle_iTXt PNGARG((png_structp png_ptr,+
−
   png_infop info_ptr, png_uint_32 length));+
−
PNG_EXTERN void png_push_read_iTXt PNGARG((png_structp png_ptr,+
−
   png_infop info_ptr));+
−
#endif+
−
+
−
#endif /* PNG_PROGRESSIVE_READ_SUPPORTED */+
−
+
−
#ifdef PNG_MNG_FEATURES_SUPPORTED+
−
PNG_EXTERN void png_do_read_intrapixel PNGARG((png_row_infop row_info,+
−
   png_bytep row));+
−
PNG_EXTERN void png_do_write_intrapixel PNGARG((png_row_infop row_info,+
−
   png_bytep row));+
−
#endif+
−
+
−
#if defined(PNG_ASSEMBLER_CODE_SUPPORTED)+
−
#if defined(PNG_MMX_CODE_SUPPORTED)+
−
/* png.c */ /* PRIVATE */+
−
PNG_EXTERN void png_init_mmx_flags PNGARG((png_structp png_ptr));+
−
#endif+
−
#endif+
−
+
−
#if defined(PNG_INCH_CONVERSIONS) && defined(PNG_FLOATING_POINT_SUPPORTED)+
−
PNG_EXTERN png_uint_32 png_get_pixels_per_inch PNGARG((png_structp png_ptr,+
−
png_infop info_ptr));+
−
+
−
PNG_EXTERN png_uint_32 png_get_x_pixels_per_inch PNGARG((png_structp png_ptr,+
−
png_infop info_ptr));+
−
+
−
PNG_EXTERN png_uint_32 png_get_y_pixels_per_inch PNGARG((png_structp png_ptr,+
−
png_infop info_ptr));+
−
+
−
PNG_EXTERN float png_get_x_offset_inches PNGARG((png_structp png_ptr,+
−
png_infop info_ptr));+
−
+
−
PNG_EXTERN float png_get_y_offset_inches PNGARG((png_structp png_ptr,+
−
png_infop info_ptr));+
−
+
−
#if defined(PNG_pHYs_SUPPORTED)+
−
PNG_EXTERN png_uint_32 png_get_pHYs_dpi PNGARG((png_structp png_ptr,+
−
png_infop info_ptr, png_uint_32 *res_x, png_uint_32 *res_y, int *unit_type));+
−
#endif /* PNG_pHYs_SUPPORTED */+
−
#endif  /* PNG_INCH_CONVERSIONS && PNG_FLOATING_POINT_SUPPORTED */+
−
+
−
/* Read the chunk header (length + type name) */+
−
PNG_EXTERN png_uint_32 png_read_chunk_header PNGARG((png_structp png_ptr));+
−
+
−
/* Added at libpng version 1.2.34 */+
−
#if defined(PNG_cHRM_SUPPORTED)+
−
PNG_EXTERN int png_check_cHRM_fixed  PNGARG((png_structp png_ptr,+
−
   png_fixed_point int_white_x, png_fixed_point int_white_y,+
−
   png_fixed_point int_red_x, png_fixed_point int_red_y, png_fixed_point+
−
   int_green_x, png_fixed_point int_green_y, png_fixed_point int_blue_x,+
−
   png_fixed_point int_blue_y));+
−
#endif+
−
+
−
#if defined(PNG_cHRM_SUPPORTED)+
−
#if !defined(PNG_NO_CHECK_cHRM)+
−
/* Added at libpng version 1.2.34 */+
−
PNG_EXTERN void png_64bit_product (long v1, long v2, unsigned long *hi_product,+
−
   unsigned long *lo_product);+
−
#endif+
−
#endif+
−
+
−
/* Maintainer: Put new private prototypes here ^ and in libpngpf.3 */+
−
+
−
#endif /* PNG_INTERNAL */+
−
+
−
#ifdef __cplusplus+
−
}+
−
#endif+
−
+
−
#endif /* PNG_VERSION_INFO_ONLY */+
−
/* Do not put anything past this line */+
−
#endif /* PNG_H */+
−