png.h
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00001 /* png.h - header file for PNG reference library
00002  *
00003  * libpng version 1.2.32 - September 18, 2008
00004  * Copyright (c) 1998-2008 Glenn Randers-Pehrson
00005  * (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger)
00006  * (Version 0.88 Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.)
00007  *
00008  * Authors and maintainers:
00009  *  libpng versions 0.71, May 1995, through 0.88, January 1996: Guy Schalnat
00010  *  libpng versions 0.89c, June 1996, through 0.96, May 1997: Andreas Dilger
00011  *  libpng versions 0.97, January 1998, through 1.2.32 - September 18, 2008: Glenn
00012  *  See also "Contributing Authors", below.
00013  *
00014  * Note about libpng version numbers:
00015  *
00016  *    Due to various miscommunications, unforeseen code incompatibilities
00017  *    and occasional factors outside the authors' control, version numbering
00018  *    on the library has not always been consistent and straightforward.
00019  *    The following table summarizes matters since version 0.89c, which was
00020  *    the first widely used release:
00021  *
00022  *    source                 png.h  png.h  shared-lib
00023  *    version                string   int  version
00024  *    -------                ------ -----  ----------
00025  *    0.89c "1.0 beta 3"     0.89      89  1.0.89
00026  *    0.90  "1.0 beta 4"     0.90      90  0.90  [should have been 2.0.90]
00027  *    0.95  "1.0 beta 5"     0.95      95  0.95  [should have been 2.0.95]
00028  *    0.96  "1.0 beta 6"     0.96      96  0.96  [should have been 2.0.96]
00029  *    0.97b "1.00.97 beta 7" 1.00.97   97  1.0.1 [should have been 2.0.97]
00030  *    0.97c                  0.97      97  2.0.97
00031  *    0.98                   0.98      98  2.0.98
00032  *    0.99                   0.99      98  2.0.99
00033  *    0.99a-m                0.99      99  2.0.99
00034  *    1.00                   1.00     100  2.1.0 [100 should be 10000]
00035  *    1.0.0      (from here on, the   100  2.1.0 [100 should be 10000]
00036  *    1.0.1       png.h string is   10001  2.1.0
00037  *    1.0.1a-e    identical to the  10002  from here on, the shared library
00038  *    1.0.2       source version)   10002  is 2.V where V is the source code
00039  *    1.0.2a-b                      10003  version, except as noted.
00040  *    1.0.3                         10003
00041  *    1.0.3a-d                      10004
00042  *    1.0.4                         10004
00043  *    1.0.4a-f                      10005
00044  *    1.0.5 (+ 2 patches)           10005
00045  *    1.0.5a-d                      10006
00046  *    1.0.5e-r                      10100 (not source compatible)
00047  *    1.0.5s-v                      10006 (not binary compatible)
00048  *    1.0.6 (+ 3 patches)           10006 (still binary incompatible)
00049  *    1.0.6d-f                      10007 (still binary incompatible)
00050  *    1.0.6g                        10007
00051  *    1.0.6h                        10007  10.6h (testing xy.z so-numbering)
00052  *    1.0.6i                        10007  10.6i
00053  *    1.0.6j                        10007  2.1.0.6j (incompatible with 1.0.0)
00054  *    1.0.7beta11-14        DLLNUM  10007  2.1.0.7beta11-14 (binary compatible)
00055  *    1.0.7beta15-18           1    10007  2.1.0.7beta15-18 (binary compatible)
00056  *    1.0.7rc1-2               1    10007  2.1.0.7rc1-2 (binary compatible)
00057  *    1.0.7                    1    10007  (still compatible)
00058  *    1.0.8beta1-4             1    10008  2.1.0.8beta1-4
00059  *    1.0.8rc1                 1    10008  2.1.0.8rc1
00060  *    1.0.8                    1    10008  2.1.0.8
00061  *    1.0.9beta1-6             1    10009  2.1.0.9beta1-6
00062  *    1.0.9rc1                 1    10009  2.1.0.9rc1
00063  *    1.0.9beta7-10            1    10009  2.1.0.9beta7-10
00064  *    1.0.9rc2                 1    10009  2.1.0.9rc2
00065  *    1.0.9                    1    10009  2.1.0.9
00066  *    1.0.10beta1              1    10010  2.1.0.10beta1
00067  *    1.0.10rc1                1    10010  2.1.0.10rc1
00068  *    1.0.10                   1    10010  2.1.0.10
00069  *    1.0.11beta1-3            1    10011  2.1.0.11beta1-3
00070  *    1.0.11rc1                1    10011  2.1.0.11rc1
00071  *    1.0.11                   1    10011  2.1.0.11
00072  *    1.0.12beta1-2            2    10012  2.1.0.12beta1-2
00073  *    1.0.12rc1                2    10012  2.1.0.12rc1
00074  *    1.0.12                   2    10012  2.1.0.12
00075  *    1.1.0a-f                 -    10100  2.1.1.0a-f (branch abandoned)
00076  *    1.2.0beta1-2             2    10200  2.1.2.0beta1-2
00077  *    1.2.0beta3-5             3    10200  3.1.2.0beta3-5
00078  *    1.2.0rc1                 3    10200  3.1.2.0rc1
00079  *    1.2.0                    3    10200  3.1.2.0
00080  *    1.2.1beta1-4             3    10201  3.1.2.1beta1-4
00081  *    1.2.1rc1-2               3    10201  3.1.2.1rc1-2
00082  *    1.2.1                    3    10201  3.1.2.1
00083  *    1.2.2beta1-6            12    10202  12.so.0.1.2.2beta1-6
00084  *    1.0.13beta1             10    10013  10.so.0.1.0.13beta1
00085  *    1.0.13rc1               10    10013  10.so.0.1.0.13rc1
00086  *    1.2.2rc1                12    10202  12.so.0.1.2.2rc1
00087  *    1.0.13                  10    10013  10.so.0.1.0.13
00088  *    1.2.2                   12    10202  12.so.0.1.2.2
00089  *    1.2.3rc1-6              12    10203  12.so.0.1.2.3rc1-6
00090  *    1.2.3                   12    10203  12.so.0.1.2.3
00091  *    1.2.4beta1-3            13    10204  12.so.0.1.2.4beta1-3
00092  *    1.0.14rc1               13    10014  10.so.0.1.0.14rc1
00093  *    1.2.4rc1                13    10204  12.so.0.1.2.4rc1
00094  *    1.0.14                  10    10014  10.so.0.1.0.14
00095  *    1.2.4                   13    10204  12.so.0.1.2.4
00096  *    1.2.5beta1-2            13    10205  12.so.0.1.2.5beta1-2
00097  *    1.0.15rc1-3             10    10015  10.so.0.1.0.15rc1-3
00098  *    1.2.5rc1-3              13    10205  12.so.0.1.2.5rc1-3
00099  *    1.0.15                  10    10015  10.so.0.1.0.15
00100  *    1.2.5                   13    10205  12.so.0.1.2.5
00101  *    1.2.6beta1-4            13    10206  12.so.0.1.2.6beta1-4
00102  *    1.0.16                  10    10016  10.so.0.1.0.16
00103  *    1.2.6                   13    10206  12.so.0.1.2.6
00104  *    1.2.7beta1-2            13    10207  12.so.0.1.2.7beta1-2
00105  *    1.0.17rc1               10    10017  10.so.0.1.0.17rc1
00106  *    1.2.7rc1                13    10207  12.so.0.1.2.7rc1
00107  *    1.0.17                  10    10017  10.so.0.1.0.17
00108  *    1.2.7                   13    10207  12.so.0.1.2.7
00109  *    1.2.8beta1-5            13    10208  12.so.0.1.2.8beta1-5
00110  *    1.0.18rc1-5             10    10018  10.so.0.1.0.18rc1-5
00111  *    1.2.8rc1-5              13    10208  12.so.0.1.2.8rc1-5
00112  *    1.0.18                  10    10018  10.so.0.1.0.18
00113  *    1.2.8                   13    10208  12.so.0.1.2.8
00114  *    1.2.9beta1-3            13    10209  12.so.0.1.2.9beta1-3
00115  *    1.2.9beta4-11           13    10209  12.so.0.9[.0]
00116  *    1.2.9rc1                13    10209  12.so.0.9[.0]
00117  *    1.2.9                   13    10209  12.so.0.9[.0]
00118  *    1.2.10beta1-8           13    10210  12.so.0.10[.0]
00119  *    1.2.10rc1-3             13    10210  12.so.0.10[.0]
00120  *    1.2.10                  13    10210  12.so.0.10[.0]
00121  *    1.2.11beta1-4           13    10211  12.so.0.11[.0]
00122  *    1.0.19rc1-5             10    10019  10.so.0.19[.0]
00123  *    1.2.11rc1-5             13    10211  12.so.0.11[.0]
00124  *    1.0.19                  10    10019  10.so.0.19[.0]
00125  *    1.2.11                  13    10211  12.so.0.11[.0]
00126  *    1.0.20                  10    10020  10.so.0.20[.0]
00127  *    1.2.12                  13    10212  12.so.0.12[.0]
00128  *    1.2.13beta1             13    10213  12.so.0.13[.0]
00129  *    1.0.21                  10    10021  10.so.0.21[.0]
00130  *    1.2.13                  13    10213  12.so.0.13[.0]
00131  *    1.2.14beta1-2           13    10214  12.so.0.14[.0]
00132  *    1.0.22rc1               10    10022  10.so.0.22[.0]
00133  *    1.2.14rc1               13    10214  12.so.0.14[.0]
00134  *    1.0.22                  10    10022  10.so.0.22[.0]
00135  *    1.2.14                  13    10214  12.so.0.14[.0]
00136  *    1.2.15beta1-6           13    10215  12.so.0.15[.0]
00137  *    1.0.23rc1-5             10    10023  10.so.0.23[.0]
00138  *    1.2.15rc1-5             13    10215  12.so.0.15[.0]
00139  *    1.0.23                  10    10023  10.so.0.23[.0]
00140  *    1.2.15                  13    10215  12.so.0.15[.0]
00141  *    1.2.16beta1-2           13    10216  12.so.0.16[.0]
00142  *    1.2.16rc1               13    10216  12.so.0.16[.0]
00143  *    1.0.24                  10    10024  10.so.0.24[.0]
00144  *    1.2.16                  13    10216  12.so.0.16[.0]
00145  *    1.2.17beta1-2           13    10217  12.so.0.17[.0]
00146  *    1.0.25rc1               10    10025  10.so.0.25[.0]
00147  *    1.2.17rc1-3             13    10217  12.so.0.17[.0]
00148  *    1.0.25                  10    10025  10.so.0.25[.0]
00149  *    1.2.17                  13    10217  12.so.0.17[.0]
00150  *    1.0.26                  10    10026  10.so.0.26[.0]
00151  *    1.2.18                  13    10218  12.so.0.18[.0]
00152  *    1.2.19beta1-31          13    10219  12.so.0.19[.0]
00153  *    1.0.27rc1-6             10    10027  10.so.0.27[.0]
00154  *    1.2.19rc1-6             13    10219  12.so.0.19[.0]
00155  *    1.0.27                  10    10027  10.so.0.27[.0]
00156  *    1.2.19                  13    10219  12.so.0.19[.0]
00157  *    1.2.20beta01-04         13    10220  12.so.0.20[.0]
00158  *    1.0.28rc1-6             10    10028  10.so.0.28[.0]
00159  *    1.2.20rc1-6             13    10220  12.so.0.20[.0]
00160  *    1.0.28                  10    10028  10.so.0.28[.0]
00161  *    1.2.20                  13    10220  12.so.0.20[.0]
00162  *    1.2.21beta1-2           13    10221  12.so.0.21[.0]
00163  *    1.2.21rc1-3             13    10221  12.so.0.21[.0]
00164  *    1.0.29                  10    10029  10.so.0.29[.0]
00165  *    1.2.21                  13    10221  12.so.0.21[.0]
00166  *    1.2.22beta1-4           13    10222  12.so.0.22[.0]
00167  *    1.0.30rc1               10    10030  10.so.0.30[.0]
00168  *    1.2.22rc1               13    10222  12.so.0.22[.0]
00169  *    1.0.30                  10    10030  10.so.0.30[.0]
00170  *    1.2.22                  13    10222  12.so.0.22[.0]
00171  *    1.2.23beta01-05         13    10223  12.so.0.23[.0]
00172  *    1.2.23rc01              13    10223  12.so.0.23[.0]
00173  *    1.2.23                  13    10223  12.so.0.23[.0]
00174  *    1.2.24beta01-02         13    10224  12.so.0.24[.0]
00175  *    1.2.24rc01              13    10224  12.so.0.24[.0]
00176  *    1.2.24                  13    10224  12.so.0.24[.0]
00177  *    1.2.25beta01-06         13    10225  12.so.0.25[.0]
00178  *    1.2.25rc01-02           13    10225  12.so.0.25[.0]
00179  *    1.0.31                  10    10031  10.so.0.31[.0]
00180  *    1.2.25                  13    10225  12.so.0.25[.0]
00181  *    1.2.26beta01-06         13    10226  12.so.0.26[.0]
00182  *    1.2.26rc01              13    10226  12.so.0.26[.0]
00183  *    1.2.26                  13    10226  12.so.0.26[.0]
00184  *    1.0.32                  10    10032  10.so.0.32[.0]
00185  *    1.2.27beta01-06         13    10227  12.so.0.27[.0]
00186  *    1.2.27rc01              13    10227  12.so.0.27[.0]
00187  *    1.0.33                  10    10033  10.so.0.33[.0]
00188  *    1.2.27                  13    10227  12.so.0.27[.0]
00189  *    1.0.34                  10    10034  10.so.0.34[.0]
00190  *    1.2.28                  13    10228  12.so.0.28[.0]
00191  *    1.2.29beta01-03         13    10229  12.so.0.29[.0]
00192  *    1.2.29rc01              13    10229  12.so.0.29[.0]
00193  *    1.0.35                  10    10035  10.so.0.35[.0]
00194  *    1.2.29                  13    10229  12.so.0.29[.0]
00195  *    1.0.37                  10    10037  10.so.0.37[.0]
00196  *    1.2.30beta01-04         13    10230  12.so.0.30[.0]
00197  *    1.0.38rc01-08           10    10038  10.so.0.38[.0]
00198  *    1.2.30rc01-08           13    10230  12.so.0.30[.0]
00199  *    1.0.38                  10    10038  10.so.0.38[.0]
00200  *    1.2.30                  13    10230  12.so.0.30[.0]
00201  *    1.0.39rc01-03           10    10039  10.so.0.39[.0]
00202  *    1.2.31rc01-03           13    10231  12.so.0.31[.0]
00203  *    1.0.39                  10    10039  10.so.0.39[.0]
00204  *    1.2.31                  13    10231  12.so.0.31[.0]
00205  *    1.2.32beta01-02         13    10232  12.so.0.32[.0]
00206  *    1.0.40rc01              10    10040  10.so.0.40[.0]
00207  *    1.2.32rc01              13    10232  12.so.0.32[.0]
00208  *    1.0.40                  10    10040  10.so.0.40[.0]
00209  *    1.2.32                  13    10232  12.so.0.32[.0]
00210  *
00211  *    Henceforth the source version will match the shared-library major
00212  *    and minor numbers; the shared-library major version number will be
00213  *    used for changes in backward compatibility, as it is intended.  The
00214  *    PNG_LIBPNG_VER macro, which is not used within libpng but is available
00215  *    for applications, is an unsigned integer of the form xyyzz corresponding
00216  *    to the source version x.y.z (leading zeros in y and z).  Beta versions
00217  *    were given the previous public release number plus a letter, until
00218  *    version 1.0.6j; from then on they were given the upcoming public
00219  *    release number plus "betaNN" or "rcNN".
00220  *
00221  *    Binary incompatibility exists only when applications make direct access
00222  *    to the info_ptr or png_ptr members through png.h, and the compiled
00223  *    application is loaded with a different version of the library.
00224  *
00225  *    DLLNUM will change each time there are forward or backward changes
00226  *    in binary compatibility (e.g., when a new feature is added).
00227  *
00228  * See libpng.txt or libpng.3 for more information.  The PNG specification
00229  * is available as a W3C Recommendation and as an ISO Specification,
00230  * <http://www.w3.org/TR/2003/REC-PNG-20031110/
00231  */
00232 
00233 /*
00234  * COPYRIGHT NOTICE, DISCLAIMER, and LICENSE:
00235  *
00236  * If you modify libpng you may insert additional notices immediately following
00237  * this sentence.
00238  *
00239  * libpng versions 1.2.6, August 15, 2004, through 1.2.32, September 18, 2008, are
00240  * Copyright (c) 2004, 2006-2008 Glenn Randers-Pehrson, and are
00241  * distributed according to the same disclaimer and license as libpng-1.2.5
00242  * with the following individual added to the list of Contributing Authors:
00243  *
00244  *    Cosmin Truta
00245  *
00246  * libpng versions 1.0.7, July 1, 2000, through 1.2.5, October 3, 2002, are
00247  * Copyright (c) 2000-2002 Glenn Randers-Pehrson, and are
00248  * distributed according to the same disclaimer and license as libpng-1.0.6
00249  * with the following individuals added to the list of Contributing Authors:
00250  *
00251  *    Simon-Pierre Cadieux
00252  *    Eric S. Raymond
00253  *    Gilles Vollant
00254  *
00255  * and with the following additions to the disclaimer:
00256  *
00257  *    There is no warranty against interference with your enjoyment of the
00258  *    library or against infringement.  There is no warranty that our
00259  *    efforts or the library will fulfill any of your particular purposes
00260  *    or needs.  This library is provided with all faults, and the entire
00261  *    risk of satisfactory quality, performance, accuracy, and effort is with
00262  *    the user.
00263  *
00264  * libpng versions 0.97, January 1998, through 1.0.6, March 20, 2000, are
00265  * Copyright (c) 1998, 1999, 2000 Glenn Randers-Pehrson, and are
00266  * distributed according to the same disclaimer and license as libpng-0.96,
00267  * with the following individuals added to the list of Contributing Authors:
00268  *
00269  *    Tom Lane
00270  *    Glenn Randers-Pehrson
00271  *    Willem van Schaik
00272  *
00273  * libpng versions 0.89, June 1996, through 0.96, May 1997, are
00274  * Copyright (c) 1996, 1997 Andreas Dilger
00275  * Distributed according to the same disclaimer and license as libpng-0.88,
00276  * with the following individuals added to the list of Contributing Authors:
00277  *
00278  *    John Bowler
00279  *    Kevin Bracey
00280  *    Sam Bushell
00281  *    Magnus Holmgren
00282  *    Greg Roelofs
00283  *    Tom Tanner
00284  *
00285  * libpng versions 0.5, May 1995, through 0.88, January 1996, are
00286  * Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.
00287  *
00288  * For the purposes of this copyright and license, "Contributing Authors"
00289  * is defined as the following set of individuals:
00290  *
00291  *    Andreas Dilger
00292  *    Dave Martindale
00293  *    Guy Eric Schalnat
00294  *    Paul Schmidt
00295  *    Tim Wegner
00296  *
00297  * The PNG Reference Library is supplied "AS IS".  The Contributing Authors
00298  * and Group 42, Inc. disclaim all warranties, expressed or implied,
00299  * including, without limitation, the warranties of merchantability and of
00300  * fitness for any purpose.  The Contributing Authors and Group 42, Inc.
00301  * assume no liability for direct, indirect, incidental, special, exemplary,
00302  * or consequential damages, which may result from the use of the PNG
00303  * Reference Library, even if advised of the possibility of such damage.
00304  *
00305  * Permission is hereby granted to use, copy, modify, and distribute this
00306  * source code, or portions hereof, for any purpose, without fee, subject
00307  * to the following restrictions:
00308  *
00309  * 1. The origin of this source code must not be misrepresented.
00310  *
00311  * 2. Altered versions must be plainly marked as such and
00312  * must not be misrepresented as being the original source.
00313  *
00314  * 3. This Copyright notice may not be removed or altered from
00315  *    any source or altered source distribution.
00316  *
00317  * The Contributing Authors and Group 42, Inc. specifically permit, without
00318  * fee, and encourage the use of this source code as a component to
00319  * supporting the PNG file format in commercial products.  If you use this
00320  * source code in a product, acknowledgment is not required but would be
00321  * appreciated.
00322  */
00323 
00324 /*
00325  * A "png_get_copyright" function is available, for convenient use in "about"
00326  * boxes and the like:
00327  *
00328  * printf("%s",png_get_copyright(NULL));
00329  *
00330  * Also, the PNG logo (in PNG format, of course) is supplied in the
00331  * files "pngbar.png" and "pngbar.jpg (88x31) and "pngnow.png" (98x31).
00332  */
00333 
00334 /*
00335  * Libpng is OSI Certified Open Source Software.  OSI Certified is a
00336  * certification mark of the Open Source Initiative.
00337  */
00338 
00339 /*
00340  * The contributing authors would like to thank all those who helped
00341  * with testing, bug fixes, and patience.  This wouldn't have been
00342  * possible without all of you.
00343  *
00344  * Thanks to Frank J. T. Wojcik for helping with the documentation.
00345  */
00346 
00347 /*
00348  * Y2K compliance in libpng:
00349  * =========================
00350  *
00351  *    September 18, 2008
00352  *
00353  *    Since the PNG Development group is an ad-hoc body, we can't make
00354  *    an official declaration.
00355  *
00356  *    This is your unofficial assurance that libpng from version 0.71 and
00357  *    upward through 1.2.32 are Y2K compliant.  It is my belief that earlier
00358  *    versions were also Y2K compliant.
00359  *
00360  *    Libpng only has three year fields.  One is a 2-byte unsigned integer
00361  *    that will hold years up to 65535.  The other two hold the date in text
00362  *    format, and will hold years up to 9999.
00363  *
00364  *    The integer is
00365  *        "png_uint_16 year" in png_time_struct.
00366  *
00367  *    The strings are
00368  *        "png_charp time_buffer" in png_struct and
00369  *        "near_time_buffer", which is a local character string in png.c.
00370  *
00371  *    There are seven time-related functions:
00372  *        png.c: png_convert_to_rfc_1123() in png.c
00373  *          (formerly png_convert_to_rfc_1152() in error)
00374  *        png_convert_from_struct_tm() in pngwrite.c, called in pngwrite.c
00375  *        png_convert_from_time_t() in pngwrite.c
00376  *        png_get_tIME() in pngget.c
00377  *        png_handle_tIME() in pngrutil.c, called in pngread.c
00378  *        png_set_tIME() in pngset.c
00379  *        png_write_tIME() in pngwutil.c, called in pngwrite.c
00380  *
00381  *    All handle dates properly in a Y2K environment.  The
00382  *    png_convert_from_time_t() function calls gmtime() to convert from system
00383  *    clock time, which returns (year - 1900), which we properly convert to
00384  *    the full 4-digit year.  There is a possibility that applications using
00385  *    libpng are not passing 4-digit years into the png_convert_to_rfc_1123()
00386  *    function, or that they are incorrectly passing only a 2-digit year
00387  *    instead of "year - 1900" into the png_convert_from_struct_tm() function,
00388  *    but this is not under our control.  The libpng documentation has always
00389  *    stated that it works with 4-digit years, and the APIs have been
00390  *    documented as such.
00391  *
00392  *    The tIME chunk itself is also Y2K compliant.  It uses a 2-byte unsigned
00393  *    integer to hold the year, and can hold years as large as 65535.
00394  *
00395  *    zlib, upon which libpng depends, is also Y2K compliant.  It contains
00396  *    no date-related code.
00397  *
00398  *       Glenn Randers-Pehrson
00399  *       libpng maintainer
00400  *       PNG Development Group
00401  */
00402 
00403 #ifndef PNG_H
00404 #define PNG_H
00405 
00406 /* This is not the place to learn how to use libpng.  The file libpng.txt
00407  * describes how to use libpng, and the file example.c summarizes it
00408  * with some code on which to build.  This file is useful for looking
00409  * at the actual function definitions and structure components.
00410  */
00411 
00412 /* Version information for png.h - this should match the version in png.c */
00413 #define PNG_LIBPNG_VER_STRING "1.2.32"
00414 #define PNG_HEADER_VERSION_STRING \
00415    " libpng version 1.2.32 - September 18, 2008\n"
00416 
00417 #define PNG_LIBPNG_VER_SONUM   0
00418 #define PNG_LIBPNG_VER_DLLNUM  13
00419 
00420 /* These should match the first 3 components of PNG_LIBPNG_VER_STRING: */
00421 #define PNG_LIBPNG_VER_MAJOR   1
00422 #define PNG_LIBPNG_VER_MINOR   2
00423 #define PNG_LIBPNG_VER_RELEASE 32
00424 /* This should match the numeric part of the final component of
00425  * PNG_LIBPNG_VER_STRING, omitting any leading zero: */
00426 
00427 #define PNG_LIBPNG_VER_BUILD  0
00428 
00429 /* Release Status */
00430 #define PNG_LIBPNG_BUILD_ALPHA    1
00431 #define PNG_LIBPNG_BUILD_BETA     2
00432 #define PNG_LIBPNG_BUILD_RC       3
00433 #define PNG_LIBPNG_BUILD_STABLE   4
00434 #define PNG_LIBPNG_BUILD_RELEASE_STATUS_MASK 7
00435   
00436 /* Release-Specific Flags */
00437 #define PNG_LIBPNG_BUILD_PATCH    8 /* Can be OR'ed with
00438                                        PNG_LIBPNG_BUILD_STABLE only */
00439 #define PNG_LIBPNG_BUILD_PRIVATE 16 /* Cannot be OR'ed with
00440                                        PNG_LIBPNG_BUILD_SPECIAL */
00441 #define PNG_LIBPNG_BUILD_SPECIAL 32 /* Cannot be OR'ed with
00442                                        PNG_LIBPNG_BUILD_PRIVATE */
00443 
00444 #define PNG_LIBPNG_BUILD_BASE_TYPE PNG_LIBPNG_BUILD_STABLE
00445 
00446 /* Careful here.  At one time, Guy wanted to use 082, but that would be octal.
00447  * We must not include leading zeros.
00448  * Versions 0.7 through 1.0.0 were in the range 0 to 100 here (only
00449  * version 1.0.0 was mis-numbered 100 instead of 10000).  From
00450  * version 1.0.1 it's    xxyyzz, where x=major, y=minor, z=release */
00451 #define PNG_LIBPNG_VER 10232 /* 1.2.32 */
00452 
00453 #ifndef PNG_VERSION_INFO_ONLY
00454 /* include the compression library's header */
00455 #include "zlib.h"
00456 #endif
00457 
00458 /* include all user configurable info, including optional assembler routines */
00459 #include "pngconf.h"
00460 
00461 /*
00462  * Added at libpng-1.2.8 */
00463 /* Ref MSDN: Private as priority over Special
00464  * VS_FF_PRIVATEBUILD File *was not* built using standard release
00465  * procedures. If this value is given, the StringFileInfo block must
00466  * contain a PrivateBuild string. 
00467  *
00468  * VS_FF_SPECIALBUILD File *was* built by the original company using
00469  * standard release procedures but is a variation of the standard
00470  * file of the same version number. If this value is given, the
00471  * StringFileInfo block must contain a SpecialBuild string. 
00472  */
00473 
00474 #if defined(PNG_USER_PRIVATEBUILD)
00475 #  define PNG_LIBPNG_BUILD_TYPE \
00476           (PNG_LIBPNG_BUILD_BASE_TYPE | PNG_LIBPNG_BUILD_PRIVATE)
00477 #else
00478 #  if defined(PNG_LIBPNG_SPECIALBUILD)
00479 #    define PNG_LIBPNG_BUILD_TYPE \
00480             (PNG_LIBPNG_BUILD_BASE_TYPE | PNG_LIBPNG_BUILD_SPECIAL)
00481 #  else
00482 #    define PNG_LIBPNG_BUILD_TYPE (PNG_LIBPNG_BUILD_BASE_TYPE)
00483 #  endif
00484 #endif
00485 
00486 #ifndef PNG_VERSION_INFO_ONLY
00487 
00488 /* Inhibit C++ name-mangling for libpng functions but not for system calls. */
00489 #ifdef __cplusplus
00490 extern "C" {
00491 #endif /* __cplusplus */
00492 
00493 /* This file is arranged in several sections.  The first section contains
00494  * structure and type definitions.  The second section contains the external
00495  * library functions, while the third has the internal library functions,
00496  * which applications aren't expected to use directly.
00497  */
00498 
00499 #ifndef PNG_NO_TYPECAST_NULL
00500 #define int_p_NULL                (int *)NULL
00501 #define png_bytep_NULL            (png_bytep)NULL
00502 #define png_bytepp_NULL           (png_bytepp)NULL
00503 #define png_doublep_NULL          (png_doublep)NULL
00504 #define png_error_ptr_NULL        (png_error_ptr)NULL
00505 #define png_flush_ptr_NULL        (png_flush_ptr)NULL
00506 #define png_free_ptr_NULL         (png_free_ptr)NULL
00507 #define png_infopp_NULL           (png_infopp)NULL
00508 #define png_malloc_ptr_NULL       (png_malloc_ptr)NULL
00509 #define png_read_status_ptr_NULL  (png_read_status_ptr)NULL
00510 #define png_rw_ptr_NULL           (png_rw_ptr)NULL
00511 #define png_structp_NULL          (png_structp)NULL
00512 #define png_uint_16p_NULL         (png_uint_16p)NULL
00513 #define png_voidp_NULL            (png_voidp)NULL
00514 #define png_write_status_ptr_NULL (png_write_status_ptr)NULL
00515 #else
00516 #define int_p_NULL                NULL
00517 #define png_bytep_NULL            NULL
00518 #define png_bytepp_NULL           NULL
00519 #define png_doublep_NULL          NULL
00520 #define png_error_ptr_NULL        NULL
00521 #define png_flush_ptr_NULL        NULL
00522 #define png_free_ptr_NULL         NULL
00523 #define png_infopp_NULL           NULL
00524 #define png_malloc_ptr_NULL       NULL
00525 #define png_read_status_ptr_NULL  NULL
00526 #define png_rw_ptr_NULL           NULL
00527 #define png_structp_NULL          NULL
00528 #define png_uint_16p_NULL         NULL
00529 #define png_voidp_NULL            NULL
00530 #define png_write_status_ptr_NULL NULL
00531 #endif
00532 
00533 /* variables declared in png.c - only it needs to define PNG_NO_EXTERN */
00534 #if !defined(PNG_NO_EXTERN) || defined(PNG_ALWAYS_EXTERN)
00535 /* Version information for C files, stored in png.c.  This had better match
00536  * the version above.
00537  */
00538 #ifdef PNG_USE_GLOBAL_ARRAYS
00539 PNG_EXPORT_VAR (PNG_CONST char) png_libpng_ver[18];
00540   /* need room for 99.99.99beta99z */
00541 #else
00542 #define png_libpng_ver png_get_header_ver(NULL)
00543 #endif
00544 
00545 #ifdef PNG_USE_GLOBAL_ARRAYS
00546 /* This was removed in version 1.0.5c */
00547 /* Structures to facilitate easy interlacing.  See png.c for more details */
00548 PNG_EXPORT_VAR (PNG_CONST int FARDATA) png_pass_start[7];
00549 PNG_EXPORT_VAR (PNG_CONST int FARDATA) png_pass_inc[7];
00550 PNG_EXPORT_VAR (PNG_CONST int FARDATA) png_pass_ystart[7];
00551 PNG_EXPORT_VAR (PNG_CONST int FARDATA) png_pass_yinc[7];
00552 PNG_EXPORT_VAR (PNG_CONST int FARDATA) png_pass_mask[7];
00553 PNG_EXPORT_VAR (PNG_CONST int FARDATA) png_pass_dsp_mask[7];
00554 /* This isn't currently used.  If you need it, see png.c for more details.
00555 PNG_EXPORT_VAR (PNG_CONST int FARDATA) png_pass_height[7];
00556 */
00557 #endif
00558 
00559 #endif /* PNG_NO_EXTERN */
00560 
00561 /* Three color definitions.  The order of the red, green, and blue, (and the
00562  * exact size) is not important, although the size of the fields need to
00563  * be png_byte or png_uint_16 (as defined below).
00564  */
00565 typedef struct png_color_struct
00566 {
00567    png_byte red;
00568    png_byte green;
00569    png_byte blue;
00570 } png_color;
00571 typedef png_color FAR * png_colorp;
00572 typedef png_color FAR * FAR * png_colorpp;
00573 
00574 typedef struct png_color_16_struct
00575 {
00576    png_byte index;    /* used for palette files */
00577    png_uint_16 red;   /* for use in red green blue files */
00578    png_uint_16 green;
00579    png_uint_16 blue;
00580    png_uint_16 gray;  /* for use in grayscale files */
00581 } png_color_16;
00582 typedef png_color_16 FAR * png_color_16p;
00583 typedef png_color_16 FAR * FAR * png_color_16pp;
00584 
00585 typedef struct png_color_8_struct
00586 {
00587    png_byte red;   /* for use in red green blue files */
00588    png_byte green;
00589    png_byte blue;
00590    png_byte gray;  /* for use in grayscale files */
00591    png_byte alpha; /* for alpha channel files */
00592 } png_color_8;
00593 typedef png_color_8 FAR * png_color_8p;
00594 typedef png_color_8 FAR * FAR * png_color_8pp;
00595 
00596 /*
00597  * The following two structures are used for the in-core representation
00598  * of sPLT chunks.
00599  */
00600 typedef struct png_sPLT_entry_struct
00601 {
00602    png_uint_16 red;
00603    png_uint_16 green;
00604    png_uint_16 blue;
00605    png_uint_16 alpha;
00606    png_uint_16 frequency;
00607 } png_sPLT_entry;
00608 typedef png_sPLT_entry FAR * png_sPLT_entryp;
00609 typedef png_sPLT_entry FAR * FAR * png_sPLT_entrypp;
00610 
00611 /*  When the depth of the sPLT palette is 8 bits, the color and alpha samples
00612  *  occupy the LSB of their respective members, and the MSB of each member
00613  *  is zero-filled.  The frequency member always occupies the full 16 bits.
00614  */
00615 
00616 typedef struct png_sPLT_struct
00617 {
00618    png_charp name;           /* palette name */
00619    png_byte depth;           /* depth of palette samples */
00620    png_sPLT_entryp entries;  /* palette entries */
00621    png_int_32 nentries;      /* number of palette entries */
00622 } png_sPLT_t;
00623 typedef png_sPLT_t FAR * png_sPLT_tp;
00624 typedef png_sPLT_t FAR * FAR * png_sPLT_tpp;
00625 
00626 #ifdef PNG_TEXT_SUPPORTED
00627 /* png_text holds the contents of a text/ztxt/itxt chunk in a PNG file,
00628  * and whether that contents is compressed or not.  The "key" field
00629  * points to a regular zero-terminated C string.  The "text", "lang", and
00630  * "lang_key" fields can be regular C strings, empty strings, or NULL pointers.
00631  * However, the * structure returned by png_get_text() will always contain
00632  * regular zero-terminated C strings (possibly empty), never NULL pointers,
00633  * so they can be safely used in printf() and other string-handling functions.
00634  */
00635 typedef struct png_text_struct
00636 {
00637    int  compression;       /* compression value:
00638                              -1: tEXt, none
00639                               0: zTXt, deflate
00640                               1: iTXt, none
00641                               2: iTXt, deflate  */
00642    png_charp key;          /* keyword, 1-79 character description of "text" */
00643    png_charp text;         /* comment, may be an empty string (ie "")
00644                               or a NULL pointer */
00645    png_size_t text_length; /* length of the text string */
00646 #ifdef PNG_iTXt_SUPPORTED
00647    png_size_t itxt_length; /* length of the itxt string */
00648    png_charp lang;         /* language code, 0-79 characters
00649                               or a NULL pointer */
00650    png_charp lang_key;     /* keyword translated UTF-8 string, 0 or more
00651                               chars or a NULL pointer */
00652 #endif
00653 } png_text;
00654 typedef png_text FAR * png_textp;
00655 typedef png_text FAR * FAR * png_textpp;
00656 #endif
00657 
00658 /* Supported compression types for text in PNG files (tEXt, and zTXt).
00659  * The values of the PNG_TEXT_COMPRESSION_ defines should NOT be changed. */
00660 #define PNG_TEXT_COMPRESSION_NONE_WR -3
00661 #define PNG_TEXT_COMPRESSION_zTXt_WR -2
00662 #define PNG_TEXT_COMPRESSION_NONE    -1
00663 #define PNG_TEXT_COMPRESSION_zTXt     0
00664 #define PNG_ITXT_COMPRESSION_NONE     1
00665 #define PNG_ITXT_COMPRESSION_zTXt     2
00666 #define PNG_TEXT_COMPRESSION_LAST     3  /* Not a valid value */
00667 
00668 /* png_time is a way to hold the time in an machine independent way.
00669  * Two conversions are provided, both from time_t and struct tm.  There
00670  * is no portable way to convert to either of these structures, as far
00671  * as I know.  If you know of a portable way, send it to me.  As a side
00672  * note - PNG has always been Year 2000 compliant!
00673  */
00674 typedef struct png_time_struct
00675 {
00676    png_uint_16 year; /* full year, as in, 1995 */
00677    png_byte month;   /* month of year, 1 - 12 */
00678    png_byte day;     /* day of month, 1 - 31 */
00679    png_byte hour;    /* hour of day, 0 - 23 */
00680    png_byte minute;  /* minute of hour, 0 - 59 */
00681    png_byte second;  /* second of minute, 0 - 60 (for leap seconds) */
00682 } png_time;
00683 typedef png_time FAR * png_timep;
00684 typedef png_time FAR * FAR * png_timepp;
00685 
00686 #if defined(PNG_UNKNOWN_CHUNKS_SUPPORTED)
00687 /* png_unknown_chunk is a structure to hold queued chunks for which there is
00688  * no specific support.  The idea is that we can use this to queue
00689  * up private chunks for output even though the library doesn't actually
00690  * know about their semantics.
00691  */
00692 #define PNG_CHUNK_NAME_LENGTH 5
00693 typedef struct png_unknown_chunk_t
00694 {
00695     png_byte name[PNG_CHUNK_NAME_LENGTH];
00696     png_byte *data;
00697     png_size_t size;
00698 
00699     /* libpng-using applications should NOT directly modify this byte. */
00700     png_byte location; /* mode of operation at read time */
00701 }
00702 png_unknown_chunk;
00703 typedef png_unknown_chunk FAR * png_unknown_chunkp;
00704 typedef png_unknown_chunk FAR * FAR * png_unknown_chunkpp;
00705 #endif
00706 
00707 /* png_info is a structure that holds the information in a PNG file so
00708  * that the application can find out the characteristics of the image.
00709  * If you are reading the file, this structure will tell you what is
00710  * in the PNG file.  If you are writing the file, fill in the information
00711  * you want to put into the PNG file, then call png_write_info().
00712  * The names chosen should be very close to the PNG specification, so
00713  * consult that document for information about the meaning of each field.
00714  *
00715  * With libpng < 0.95, it was only possible to directly set and read the
00716  * the values in the png_info_struct, which meant that the contents and
00717  * order of the values had to remain fixed.  With libpng 0.95 and later,
00718  * however, there are now functions that abstract the contents of
00719  * png_info_struct from the application, so this makes it easier to use
00720  * libpng with dynamic libraries, and even makes it possible to use
00721  * libraries that don't have all of the libpng ancillary chunk-handing
00722  * functionality.
00723  *
00724  * In any case, the order of the parameters in png_info_struct should NOT
00725  * be changed for as long as possible to keep compatibility with applications
00726  * that use the old direct-access method with png_info_struct.
00727  *
00728  * The following members may have allocated storage attached that should be
00729  * cleaned up before the structure is discarded: palette, trans, text,
00730  * pcal_purpose, pcal_units, pcal_params, hist, iccp_name, iccp_profile,
00731  * splt_palettes, scal_unit, row_pointers, and unknowns.   By default, these
00732  * are automatically freed when the info structure is deallocated, if they were
00733  * allocated internally by libpng.  This behavior can be changed by means
00734  * of the png_data_freer() function.
00735  *
00736  * More allocation details: all the chunk-reading functions that
00737  * change these members go through the corresponding png_set_*
00738  * functions.  A function to clear these members is available: see
00739  * png_free_data().  The png_set_* functions do not depend on being
00740  * able to point info structure members to any of the storage they are
00741  * passed (they make their own copies), EXCEPT that the png_set_text
00742  * functions use the same storage passed to them in the text_ptr or
00743  * itxt_ptr structure argument, and the png_set_rows and png_set_unknowns
00744  * functions do not make their own copies.
00745  */
00746 typedef struct png_info_struct
00747 {
00748    /* the following are necessary for every PNG file */
00749    png_uint_32 width;       /* width of image in pixels (from IHDR) */
00750    png_uint_32 height;      /* height of image in pixels (from IHDR) */
00751    png_uint_32 valid;       /* valid chunk data (see PNG_INFO_ below) */
00752    png_uint_32 rowbytes;    /* bytes needed to hold an untransformed row */
00753    png_colorp palette;      /* array of color values (valid & PNG_INFO_PLTE) */
00754    png_uint_16 num_palette; /* number of color entries in "palette" (PLTE) */
00755    png_uint_16 num_trans;   /* number of transparent palette color (tRNS) */
00756    png_byte bit_depth;      /* 1, 2, 4, 8, or 16 bits/channel (from IHDR) */
00757    png_byte color_type;     /* see PNG_COLOR_TYPE_ below (from IHDR) */
00758    /* The following three should have been named *_method not *_type */
00759    png_byte compression_type; /* must be PNG_COMPRESSION_TYPE_BASE (IHDR) */
00760    png_byte filter_type;    /* must be PNG_FILTER_TYPE_BASE (from IHDR) */
00761    png_byte interlace_type; /* One of PNG_INTERLACE_NONE, PNG_INTERLACE_ADAM7 */
00762 
00763    /* The following is informational only on read, and not used on writes. */
00764    png_byte channels;       /* number of data channels per pixel (1, 2, 3, 4) */
00765    png_byte pixel_depth;    /* number of bits per pixel */
00766    png_byte spare_byte;     /* to align the data, and for future use */
00767    png_byte signature[8];   /* magic bytes read by libpng from start of file */
00768 
00769    /* The rest of the data is optional.  If you are reading, check the
00770     * valid field to see if the information in these are valid.  If you
00771     * are writing, set the valid field to those chunks you want written,
00772     * and initialize the appropriate fields below.
00773     */
00774 
00775 #if defined(PNG_gAMA_SUPPORTED) && defined(PNG_FLOATING_POINT_SUPPORTED)
00776    /* The gAMA chunk describes the gamma characteristics of the system
00777     * on which the image was created, normally in the range [1.0, 2.5].
00778     * Data is valid if (valid & PNG_INFO_gAMA) is non-zero.
00779     */
00780    float gamma; /* gamma value of image, if (valid & PNG_INFO_gAMA) */
00781 #endif
00782 
00783 #if defined(PNG_sRGB_SUPPORTED)
00784     /* GR-P, 0.96a */
00785     /* Data valid if (valid & PNG_INFO_sRGB) non-zero. */
00786    png_byte srgb_intent; /* sRGB rendering intent [0, 1, 2, or 3] */
00787 #endif
00788 
00789 #if defined(PNG_TEXT_SUPPORTED)
00790    /* The tEXt, and zTXt chunks contain human-readable textual data in
00791     * uncompressed, compressed, and optionally compressed forms, respectively.
00792     * The data in "text" is an array of pointers to uncompressed,
00793     * null-terminated C strings. Each chunk has a keyword that describes the
00794     * textual data contained in that chunk.  Keywords are not required to be
00795     * unique, and the text string may be empty.  Any number of text chunks may
00796     * be in an image.
00797     */
00798    int num_text; /* number of comments read/to write */
00799    int max_text; /* current size of text array */
00800    png_textp text; /* array of comments read/to write */
00801 #endif /* PNG_TEXT_SUPPORTED */
00802 
00803 #if defined(PNG_tIME_SUPPORTED)
00804    /* The tIME chunk holds the last time the displayed image data was
00805     * modified.  See the png_time struct for the contents of this struct.
00806     */
00807    png_time mod_time;
00808 #endif
00809 
00810 #if defined(PNG_sBIT_SUPPORTED)
00811    /* The sBIT chunk specifies the number of significant high-order bits
00812     * in the pixel data.  Values are in the range [1, bit_depth], and are
00813     * only specified for the channels in the pixel data.  The contents of
00814     * the low-order bits is not specified.  Data is valid if
00815     * (valid & PNG_INFO_sBIT) is non-zero.
00816     */
00817    png_color_8 sig_bit; /* significant bits in color channels */
00818 #endif
00819 
00820 #if defined(PNG_tRNS_SUPPORTED) || defined(PNG_READ_EXPAND_SUPPORTED) || \
00821 defined(PNG_READ_BACKGROUND_SUPPORTED)
00822    /* The tRNS chunk supplies transparency data for paletted images and
00823     * other image types that don't need a full alpha channel.  There are
00824     * "num_trans" transparency values for a paletted image, stored in the
00825     * same order as the palette colors, starting from index 0.  Values
00826     * for the data are in the range [0, 255], ranging from fully transparent
00827     * to fully opaque, respectively.  For non-paletted images, there is a
00828     * single color specified that should be treated as fully transparent.
00829     * Data is valid if (valid & PNG_INFO_tRNS) is non-zero.
00830     */
00831    png_bytep trans; /* transparent values for paletted image */
00832    png_color_16 trans_values; /* transparent color for non-palette image */
00833 #endif
00834 
00835 #if defined(PNG_bKGD_SUPPORTED) || defined(PNG_READ_BACKGROUND_SUPPORTED)
00836    /* The bKGD chunk gives the suggested image background color if the
00837     * display program does not have its own background color and the image
00838     * is needs to composited onto a background before display.  The colors
00839     * in "background" are normally in the same color space/depth as the
00840     * pixel data.  Data is valid if (valid & PNG_INFO_bKGD) is non-zero.
00841     */
00842    png_color_16 background;
00843 #endif
00844 
00845 #if defined(PNG_oFFs_SUPPORTED)
00846    /* The oFFs chunk gives the offset in "offset_unit_type" units rightwards
00847     * and downwards from the top-left corner of the display, page, or other
00848     * application-specific co-ordinate space.  See the PNG_OFFSET_ defines
00849     * below for the unit types.  Valid if (valid & PNG_INFO_oFFs) non-zero.
00850     */
00851    png_int_32 x_offset; /* x offset on page */
00852    png_int_32 y_offset; /* y offset on page */
00853    png_byte offset_unit_type; /* offset units type */
00854 #endif
00855 
00856 #if defined(PNG_pHYs_SUPPORTED)
00857    /* The pHYs chunk gives the physical pixel density of the image for
00858     * display or printing in "phys_unit_type" units (see PNG_RESOLUTION_
00859     * defines below).  Data is valid if (valid & PNG_INFO_pHYs) is non-zero.
00860     */
00861    png_uint_32 x_pixels_per_unit; /* horizontal pixel density */
00862    png_uint_32 y_pixels_per_unit; /* vertical pixel density */
00863    png_byte phys_unit_type; /* resolution type (see PNG_RESOLUTION_ below) */
00864 #endif
00865 
00866 #if defined(PNG_hIST_SUPPORTED)
00867    /* The hIST chunk contains the relative frequency or importance of the
00868     * various palette entries, so that a viewer can intelligently select a
00869     * reduced-color palette, if required.  Data is an array of "num_palette"
00870     * values in the range [0,65535]. Data valid if (valid & PNG_INFO_hIST)
00871     * is non-zero.
00872     */
00873    png_uint_16p hist;
00874 #endif
00875 
00876 #ifdef PNG_cHRM_SUPPORTED
00877    /* The cHRM chunk describes the CIE color characteristics of the monitor
00878     * on which the PNG was created.  This data allows the viewer to do gamut
00879     * mapping of the input image to ensure that the viewer sees the same
00880     * colors in the image as the creator.  Values are in the range
00881     * [0.0, 0.8].  Data valid if (valid & PNG_INFO_cHRM) non-zero.
00882     */
00883 #ifdef PNG_FLOATING_POINT_SUPPORTED
00884    float x_white;
00885    float y_white;
00886    float x_red;
00887    float y_red;
00888    float x_green;
00889    float y_green;
00890    float x_blue;
00891    float y_blue;
00892 #endif
00893 #endif
00894 
00895 #if defined(PNG_pCAL_SUPPORTED)
00896    /* The pCAL chunk describes a transformation between the stored pixel
00897     * values and original physical data values used to create the image.
00898     * The integer range [0, 2^bit_depth - 1] maps to the floating-point
00899     * range given by [pcal_X0, pcal_X1], and are further transformed by a
00900     * (possibly non-linear) transformation function given by "pcal_type"
00901     * and "pcal_params" into "pcal_units".  Please see the PNG_EQUATION_
00902     * defines below, and the PNG-Group's PNG extensions document for a
00903     * complete description of the transformations and how they should be
00904     * implemented, and for a description of the ASCII parameter strings.
00905     * Data values are valid if (valid & PNG_INFO_pCAL) non-zero.
00906     */
00907    png_charp pcal_purpose;  /* pCAL chunk description string */
00908    png_int_32 pcal_X0;      /* minimum value */
00909    png_int_32 pcal_X1;      /* maximum value */
00910    png_charp pcal_units;    /* Latin-1 string giving physical units */
00911    png_charpp pcal_params;  /* ASCII strings containing parameter values */
00912    png_byte pcal_type;      /* equation type (see PNG_EQUATION_ below) */
00913    png_byte pcal_nparams;   /* number of parameters given in pcal_params */
00914 #endif
00915 
00916 /* New members added in libpng-1.0.6 */
00917 #ifdef PNG_FREE_ME_SUPPORTED
00918    png_uint_32 free_me;     /* flags items libpng is responsible for freeing */
00919 #endif
00920 
00921 #if defined(PNG_UNKNOWN_CHUNKS_SUPPORTED)
00922    /* storage for unknown chunks that the library doesn't recognize. */
00923    png_unknown_chunkp unknown_chunks;
00924    png_size_t unknown_chunks_num;
00925 #endif
00926 
00927 #if defined(PNG_iCCP_SUPPORTED)
00928    /* iCCP chunk data. */
00929    png_charp iccp_name;     /* profile name */
00930    png_charp iccp_profile;  /* International Color Consortium profile data */
00931                             /* Note to maintainer: should be png_bytep */
00932    png_uint_32 iccp_proflen;  /* ICC profile data length */
00933    png_byte iccp_compression; /* Always zero */
00934 #endif
00935 
00936 #if defined(PNG_sPLT_SUPPORTED)
00937    /* data on sPLT chunks (there may be more than one). */
00938    png_sPLT_tp splt_palettes;
00939    png_uint_32 splt_palettes_num;
00940 #endif
00941 
00942 #if defined(PNG_sCAL_SUPPORTED)
00943    /* The sCAL chunk describes the actual physical dimensions of the
00944     * subject matter of the graphic.  The chunk contains a unit specification
00945     * a byte value, and two ASCII strings representing floating-point
00946     * values.  The values are width and height corresponsing to one pixel
00947     * in the image.  This external representation is converted to double
00948     * here.  Data values are valid if (valid & PNG_INFO_sCAL) is non-zero.
00949     */
00950    png_byte scal_unit;         /* unit of physical scale */
00951 #ifdef PNG_FLOATING_POINT_SUPPORTED
00952    double scal_pixel_width;    /* width of one pixel */
00953    double scal_pixel_height;   /* height of one pixel */
00954 #endif
00955 #ifdef PNG_FIXED_POINT_SUPPORTED
00956    png_charp scal_s_width;     /* string containing height */
00957    png_charp scal_s_height;    /* string containing width */
00958 #endif
00959 #endif
00960 
00961 #if defined(PNG_INFO_IMAGE_SUPPORTED)
00962    /* Memory has been allocated if (valid & PNG_ALLOCATED_INFO_ROWS) non-zero */
00963    /* Data valid if (valid & PNG_INFO_IDAT) non-zero */
00964    png_bytepp row_pointers;        /* the image bits */
00965 #endif
00966 
00967 #if defined(PNG_FIXED_POINT_SUPPORTED) && defined(PNG_gAMA_SUPPORTED)
00968    png_fixed_point int_gamma; /* gamma of image, if (valid & PNG_INFO_gAMA) */
00969 #endif
00970 
00971 #if defined(PNG_cHRM_SUPPORTED) && defined(PNG_FIXED_POINT_SUPPORTED)
00972    png_fixed_point int_x_white;
00973    png_fixed_point int_y_white;
00974    png_fixed_point int_x_red;
00975    png_fixed_point int_y_red;
00976    png_fixed_point int_x_green;
00977    png_fixed_point int_y_green;
00978    png_fixed_point int_x_blue;
00979    png_fixed_point int_y_blue;
00980 #endif
00981 
00982 } png_info;
00983 
00984 typedef png_info FAR * png_infop;
00985 typedef png_info FAR * FAR * png_infopp;
00986 
00987 /* Maximum positive integer used in PNG is (2^31)-1 */
00988 #define PNG_UINT_31_MAX ((png_uint_32)0x7fffffffL)
00989 #define PNG_UINT_32_MAX ((png_uint_32)(-1))
00990 #define PNG_SIZE_MAX ((png_size_t)(-1))
00991 #if defined(PNG_1_0_X) || defined (PNG_1_2_X)
00992 /* PNG_MAX_UINT is deprecated; use PNG_UINT_31_MAX instead. */
00993 #define PNG_MAX_UINT PNG_UINT_31_MAX
00994 #endif
00995 
00996 /* These describe the color_type field in png_info. */
00997 /* color type masks */
00998 #define PNG_COLOR_MASK_PALETTE    1
00999 #define PNG_COLOR_MASK_COLOR      2
01000 #define PNG_COLOR_MASK_ALPHA      4
01001 
01002 /* color types.  Note that not all combinations are legal */
01003 #define PNG_COLOR_TYPE_GRAY 0
01004 #define PNG_COLOR_TYPE_PALETTE  (PNG_COLOR_MASK_COLOR | PNG_COLOR_MASK_PALETTE)
01005 #define PNG_COLOR_TYPE_RGB        (PNG_COLOR_MASK_COLOR)
01006 #define PNG_COLOR_TYPE_RGB_ALPHA  (PNG_COLOR_MASK_COLOR | PNG_COLOR_MASK_ALPHA)
01007 #define PNG_COLOR_TYPE_GRAY_ALPHA (PNG_COLOR_MASK_ALPHA)
01008 /* aliases */
01009 #define PNG_COLOR_TYPE_RGBA  PNG_COLOR_TYPE_RGB_ALPHA
01010 #define PNG_COLOR_TYPE_GA  PNG_COLOR_TYPE_GRAY_ALPHA
01011 
01012 /* This is for compression type. PNG 1.0-1.2 only define the single type. */
01013 #define PNG_COMPRESSION_TYPE_BASE 0 /* Deflate method 8, 32K window */
01014 #define PNG_COMPRESSION_TYPE_DEFAULT PNG_COMPRESSION_TYPE_BASE
01015 
01016 /* This is for filter type. PNG 1.0-1.2 only define the single type. */
01017 #define PNG_FILTER_TYPE_BASE      0 /* Single row per-byte filtering */
01018 #define PNG_INTRAPIXEL_DIFFERENCING 64 /* Used only in MNG datastreams */
01019 #define PNG_FILTER_TYPE_DEFAULT   PNG_FILTER_TYPE_BASE
01020 
01021 /* These are for the interlacing type.  These values should NOT be changed. */
01022 #define PNG_INTERLACE_NONE        0 /* Non-interlaced image */
01023 #define PNG_INTERLACE_ADAM7       1 /* Adam7 interlacing */
01024 #define PNG_INTERLACE_LAST        2 /* Not a valid value */
01025 
01026 /* These are for the oFFs chunk.  These values should NOT be changed. */
01027 #define PNG_OFFSET_PIXEL          0 /* Offset in pixels */
01028 #define PNG_OFFSET_MICROMETER     1 /* Offset in micrometers (1/10^6 meter) */
01029 #define PNG_OFFSET_LAST           2 /* Not a valid value */
01030 
01031 /* These are for the pCAL chunk.  These values should NOT be changed. */
01032 #define PNG_EQUATION_LINEAR       0 /* Linear transformation */
01033 #define PNG_EQUATION_BASE_E       1 /* Exponential base e transform */
01034 #define PNG_EQUATION_ARBITRARY    2 /* Arbitrary base exponential transform */
01035 #define PNG_EQUATION_HYPERBOLIC   3 /* Hyperbolic sine transformation */
01036 #define PNG_EQUATION_LAST         4 /* Not a valid value */
01037 
01038 /* These are for the sCAL chunk.  These values should NOT be changed. */
01039 #define PNG_SCALE_UNKNOWN         0 /* unknown unit (image scale) */
01040 #define PNG_SCALE_METER           1 /* meters per pixel */
01041 #define PNG_SCALE_RADIAN          2 /* radians per pixel */
01042 #define PNG_SCALE_LAST            3 /* Not a valid value */
01043 
01044 /* These are for the pHYs chunk.  These values should NOT be changed. */
01045 #define PNG_RESOLUTION_UNKNOWN    0 /* pixels/unknown unit (aspect ratio) */
01046 #define PNG_RESOLUTION_METER      1 /* pixels/meter */
01047 #define PNG_RESOLUTION_LAST       2 /* Not a valid value */
01048 
01049 /* These are for the sRGB chunk.  These values should NOT be changed. */
01050 #define PNG_sRGB_INTENT_PERCEPTUAL 0
01051 #define PNG_sRGB_INTENT_RELATIVE   1
01052 #define PNG_sRGB_INTENT_SATURATION 2
01053 #define PNG_sRGB_INTENT_ABSOLUTE   3
01054 #define PNG_sRGB_INTENT_LAST       4 /* Not a valid value */
01055 
01056 /* This is for text chunks */
01057 #define PNG_KEYWORD_MAX_LENGTH     79
01058 
01059 /* Maximum number of entries in PLTE/sPLT/tRNS arrays */
01060 #define PNG_MAX_PALETTE_LENGTH    256
01061 
01062 /* These determine if an ancillary chunk's data has been successfully read
01063  * from the PNG header, or if the application has filled in the corresponding
01064  * data in the info_struct to be written into the output file.  The values
01065  * of the PNG_INFO_<chunk> defines should NOT be changed.
01066  */
01067 #define PNG_INFO_gAMA 0x0001
01068 #define PNG_INFO_sBIT 0x0002
01069 #define PNG_INFO_cHRM 0x0004
01070 #define PNG_INFO_PLTE 0x0008
01071 #define PNG_INFO_tRNS 0x0010
01072 #define PNG_INFO_bKGD 0x0020
01073 #define PNG_INFO_hIST 0x0040
01074 #define PNG_INFO_pHYs 0x0080
01075 #define PNG_INFO_oFFs 0x0100
01076 #define PNG_INFO_tIME 0x0200
01077 #define PNG_INFO_pCAL 0x0400
01078 #define PNG_INFO_sRGB 0x0800   /* GR-P, 0.96a */
01079 #define PNG_INFO_iCCP 0x1000   /* ESR, 1.0.6 */
01080 #define PNG_INFO_sPLT 0x2000   /* ESR, 1.0.6 */
01081 #define PNG_INFO_sCAL 0x4000   /* ESR, 1.0.6 */
01082 #define PNG_INFO_IDAT 0x8000L  /* ESR, 1.0.6 */
01083 
01084 /* This is used for the transformation routines, as some of them
01085  * change these values for the row.  It also should enable using
01086  * the routines for other purposes.
01087  */
01088 typedef struct png_row_info_struct
01089 {
01090    png_uint_32 width; /* width of row */
01091    png_uint_32 rowbytes; /* number of bytes in row */
01092    png_byte color_type; /* color type of row */
01093    png_byte bit_depth; /* bit depth of row */
01094    png_byte channels; /* number of channels (1, 2, 3, or 4) */
01095    png_byte pixel_depth; /* bits per pixel (depth * channels) */
01096 } png_row_info;
01097 
01098 typedef png_row_info FAR * png_row_infop;
01099 typedef png_row_info FAR * FAR * png_row_infopp;
01100 
01101 /* These are the function types for the I/O functions and for the functions
01102  * that allow the user to override the default I/O functions with his or her
01103  * own.  The png_error_ptr type should match that of user-supplied warning
01104  * and error functions, while the png_rw_ptr type should match that of the
01105  * user read/write data functions.
01106  */
01107 typedef struct png_struct_def png_struct;
01108 typedef png_struct FAR * png_structp;
01109 
01110 typedef void (PNGAPI *png_error_ptr) PNGARG((png_structp, png_const_charp));
01111 typedef void (PNGAPI *png_rw_ptr) PNGARG((png_structp, png_bytep, png_size_t));
01112 typedef void (PNGAPI *png_flush_ptr) PNGARG((png_structp));
01113 typedef void (PNGAPI *png_read_status_ptr) PNGARG((png_structp, png_uint_32,
01114    int));
01115 typedef void (PNGAPI *png_write_status_ptr) PNGARG((png_structp, png_uint_32,
01116    int));
01117 
01118 #ifdef PNG_PROGRESSIVE_READ_SUPPORTED
01119 typedef void (PNGAPI *png_progressive_info_ptr) PNGARG((png_structp, png_infop));
01120 typedef void (PNGAPI *png_progressive_end_ptr) PNGARG((png_structp, png_infop));
01121 typedef void (PNGAPI *png_progressive_row_ptr) PNGARG((png_structp, png_bytep,
01122    png_uint_32, int));
01123 #endif
01124 
01125 #if defined(PNG_READ_USER_TRANSFORM_SUPPORTED) || \
01126     defined(PNG_WRITE_USER_TRANSFORM_SUPPORTED) || \
01127     defined(PNG_LEGACY_SUPPORTED)
01128 typedef void (PNGAPI *png_user_transform_ptr) PNGARG((png_structp,
01129     png_row_infop, png_bytep));
01130 #endif
01131 
01132 #if defined(PNG_USER_CHUNKS_SUPPORTED)
01133 typedef int (PNGAPI *png_user_chunk_ptr) PNGARG((png_structp, png_unknown_chunkp));
01134 #endif
01135 #if defined(PNG_UNKNOWN_CHUNKS_SUPPORTED)
01136 typedef void (PNGAPI *png_unknown_chunk_ptr) PNGARG((png_structp));
01137 #endif
01138 
01139 /* Transform masks for the high-level interface */
01140 #define PNG_TRANSFORM_IDENTITY       0x0000    /* read and write */
01141 #define PNG_TRANSFORM_STRIP_16       0x0001    /* read only */
01142 #define PNG_TRANSFORM_STRIP_ALPHA    0x0002    /* read only */
01143 #define PNG_TRANSFORM_PACKING        0x0004    /* read and write */
01144 #define PNG_TRANSFORM_PACKSWAP       0x0008    /* read and write */
01145 #define PNG_TRANSFORM_EXPAND         0x0010    /* read only */
01146 #define PNG_TRANSFORM_INVERT_MONO    0x0020    /* read and write */
01147 #define PNG_TRANSFORM_SHIFT          0x0040    /* read and write */
01148 #define PNG_TRANSFORM_BGR            0x0080    /* read and write */
01149 #define PNG_TRANSFORM_SWAP_ALPHA     0x0100    /* read and write */
01150 #define PNG_TRANSFORM_SWAP_ENDIAN    0x0200    /* read and write */
01151 #define PNG_TRANSFORM_INVERT_ALPHA   0x0400    /* read and write */
01152 #define PNG_TRANSFORM_STRIP_FILLER   0x0800    /* WRITE only */
01153 
01154 /* Flags for MNG supported features */
01155 #define PNG_FLAG_MNG_EMPTY_PLTE     0x01
01156 #define PNG_FLAG_MNG_FILTER_64      0x04
01157 #define PNG_ALL_MNG_FEATURES        0x05
01158 
01159 typedef png_voidp (*png_malloc_ptr) PNGARG((png_structp, png_size_t));
01160 typedef void (*png_free_ptr) PNGARG((png_structp, png_voidp));
01161 
01162 /* The structure that holds the information to read and write PNG files.
01163  * The only people who need to care about what is inside of this are the
01164  * people who will be modifying the library for their own special needs.
01165  * It should NOT be accessed directly by an application, except to store
01166  * the jmp_buf.
01167  */
01168 
01169 struct png_struct_def
01170 {
01171 #ifdef PNG_SETJMP_SUPPORTED
01172    jmp_buf jmpbuf;            /* used in png_error */
01173 #endif
01174    png_error_ptr error_fn;    /* function for printing errors and aborting */
01175    png_error_ptr warning_fn;  /* function for printing warnings */
01176    png_voidp error_ptr;       /* user supplied struct for error functions */
01177    png_rw_ptr write_data_fn;  /* function for writing output data */
01178    png_rw_ptr read_data_fn;   /* function for reading input data */
01179    png_voidp io_ptr;          /* ptr to application struct for I/O functions */
01180 
01181 #if defined(PNG_READ_USER_TRANSFORM_SUPPORTED)
01182    png_user_transform_ptr read_user_transform_fn; /* user read transform */
01183 #endif
01184 
01185 #if defined(PNG_WRITE_USER_TRANSFORM_SUPPORTED)
01186    png_user_transform_ptr write_user_transform_fn; /* user write transform */
01187 #endif
01188 
01189 /* These were added in libpng-1.0.2 */
01190 #if defined(PNG_USER_TRANSFORM_PTR_SUPPORTED)
01191 #if defined(PNG_READ_USER_TRANSFORM_SUPPORTED) || \
01192     defined(PNG_WRITE_USER_TRANSFORM_SUPPORTED)
01193    png_voidp user_transform_ptr; /* user supplied struct for user transform */
01194    png_byte user_transform_depth;    /* bit depth of user transformed pixels */
01195    png_byte user_transform_channels; /* channels in user transformed pixels */
01196 #endif
01197 #endif
01198 
01199    png_uint_32 mode;          /* tells us where we are in the PNG file */
01200    png_uint_32 flags;         /* flags indicating various things to libpng */
01201    png_uint_32 transformations; /* which transformations to perform */
01202 
01203    z_stream zstream;          /* pointer to decompression structure (below) */
01204    png_bytep zbuf;            /* buffer for zlib */
01205    png_size_t zbuf_size;      /* size of zbuf */
01206    int zlib_level;            /* holds zlib compression level */
01207    int zlib_method;           /* holds zlib compression method */
01208    int zlib_window_bits;      /* holds zlib compression window bits */
01209    int zlib_mem_level;        /* holds zlib compression memory level */
01210    int zlib_strategy;         /* holds zlib compression strategy */
01211 
01212    png_uint_32 width;         /* width of image in pixels */
01213    png_uint_32 height;        /* height of image in pixels */
01214    png_uint_32 num_rows;      /* number of rows in current pass */
01215    png_uint_32 usr_width;     /* width of row at start of write */
01216    png_uint_32 rowbytes;      /* size of row in bytes */
01217    png_uint_32 irowbytes;     /* size of current interlaced row in bytes */
01218    png_uint_32 iwidth;        /* width of current interlaced row in pixels */
01219    png_uint_32 row_number;    /* current row in interlace pass */
01220    png_bytep prev_row;        /* buffer to save previous (unfiltered) row */
01221    png_bytep row_buf;         /* buffer to save current (unfiltered) row */
01222 #ifndef PNG_NO_WRITE_FILTER
01223    png_bytep sub_row;         /* buffer to save "sub" row when filtering */
01224    png_bytep up_row;          /* buffer to save "up" row when filtering */
01225    png_bytep avg_row;         /* buffer to save "avg" row when filtering */
01226    png_bytep paeth_row;       /* buffer to save "Paeth" row when filtering */
01227 #endif
01228    png_row_info row_info;     /* used for transformation routines */
01229 
01230    png_uint_32 idat_size;     /* current IDAT size for read */
01231    png_uint_32 crc;           /* current chunk CRC value */
01232    png_colorp palette;        /* palette from the input file */
01233    png_uint_16 num_palette;   /* number of color entries in palette */
01234    png_uint_16 num_trans;     /* number of transparency values */
01235    png_byte chunk_name[5];    /* null-terminated name of current chunk */
01236    png_byte compression;      /* file compression type (always 0) */
01237    png_byte filter;           /* file filter type (always 0) */
01238    png_byte interlaced;       /* PNG_INTERLACE_NONE, PNG_INTERLACE_ADAM7 */
01239    png_byte pass;             /* current interlace pass (0 - 6) */
01240    png_byte do_filter;        /* row filter flags (see PNG_FILTER_ below ) */
01241    png_byte color_type;       /* color type of file */
01242    png_byte bit_depth;        /* bit depth of file */
01243    png_byte usr_bit_depth;    /* bit depth of users row */
01244    png_byte pixel_depth;      /* number of bits per pixel */
01245    png_byte channels;         /* number of channels in file */
01246    png_byte usr_channels;     /* channels at start of write */
01247    png_byte sig_bytes;        /* magic bytes read/written from start of file */
01248 
01249 #if defined(PNG_READ_FILLER_SUPPORTED) || defined(PNG_WRITE_FILLER_SUPPORTED)
01250 #ifdef PNG_LEGACY_SUPPORTED
01251    png_byte filler;           /* filler byte for pixel expansion */
01252 #else
01253    png_uint_16 filler;           /* filler bytes for pixel expansion */
01254 #endif
01255 #endif
01256 
01257 #if defined(PNG_bKGD_SUPPORTED)
01258    png_byte background_gamma_type;
01259 #  ifdef PNG_FLOATING_POINT_SUPPORTED
01260    float background_gamma;
01261 #  endif
01262    png_color_16 background;   /* background color in screen gamma space */
01263 #if defined(PNG_READ_GAMMA_SUPPORTED)
01264    png_color_16 background_1; /* background normalized to gamma 1.0 */
01265 #endif
01266 #endif /* PNG_bKGD_SUPPORTED */
01267 
01268 #if defined(PNG_WRITE_FLUSH_SUPPORTED)
01269    png_flush_ptr output_flush_fn;/* Function for flushing output */
01270    png_uint_32 flush_dist;    /* how many rows apart to flush, 0 - no flush */
01271    png_uint_32 flush_rows;    /* number of rows written since last flush */
01272 #endif
01273 
01274 #if defined(PNG_READ_GAMMA_SUPPORTED) || defined(PNG_READ_BACKGROUND_SUPPORTED)
01275    int gamma_shift;      /* number of "insignificant" bits 16-bit gamma */
01276 #ifdef PNG_FLOATING_POINT_SUPPORTED
01277    float gamma;          /* file gamma value */
01278    float screen_gamma;   /* screen gamma value (display_exponent) */
01279 #endif
01280 #endif
01281 
01282 #if defined(PNG_READ_GAMMA_SUPPORTED) || defined(PNG_READ_BACKGROUND_SUPPORTED)
01283    png_bytep gamma_table;     /* gamma table for 8-bit depth files */
01284    png_bytep gamma_from_1;    /* converts from 1.0 to screen */
01285    png_bytep gamma_to_1;      /* converts from file to 1.0 */
01286    png_uint_16pp gamma_16_table; /* gamma table for 16-bit depth files */
01287    png_uint_16pp gamma_16_from_1; /* converts from 1.0 to screen */
01288    png_uint_16pp gamma_16_to_1; /* converts from file to 1.0 */
01289 #endif
01290 
01291 #if defined(PNG_READ_GAMMA_SUPPORTED) || defined(PNG_sBIT_SUPPORTED)
01292    png_color_8 sig_bit;       /* significant bits in each available channel */
01293 #endif
01294 
01295 #if defined(PNG_READ_SHIFT_SUPPORTED) || defined(PNG_WRITE_SHIFT_SUPPORTED)
01296    png_color_8 shift;         /* shift for significant bit tranformation */
01297 #endif
01298 
01299 #if defined(PNG_tRNS_SUPPORTED) || defined(PNG_READ_BACKGROUND_SUPPORTED) \
01300  || defined(PNG_READ_EXPAND_SUPPORTED) || defined(PNG_READ_BACKGROUND_SUPPORTED)
01301    png_bytep trans;           /* transparency values for paletted files */
01302    png_color_16 trans_values; /* transparency values for non-paletted files */
01303 #endif
01304 
01305    png_read_status_ptr read_row_fn;   /* called after each row is decoded */
01306    png_write_status_ptr write_row_fn; /* called after each row is encoded */
01307 #ifdef PNG_PROGRESSIVE_READ_SUPPORTED
01308    png_progressive_info_ptr info_fn; /* called after header data fully read */
01309    png_progressive_row_ptr row_fn;   /* called after each prog. row is decoded */
01310    png_progressive_end_ptr end_fn;   /* called after image is complete */
01311    png_bytep save_buffer_ptr;        /* current location in save_buffer */
01312    png_bytep save_buffer;            /* buffer for previously read data */
01313    png_bytep current_buffer_ptr;     /* current location in current_buffer */
01314    png_bytep current_buffer;         /* buffer for recently used data */
01315    png_uint_32 push_length;          /* size of current input chunk */
01316    png_uint_32 skip_length;          /* bytes to skip in input data */
01317    png_size_t save_buffer_size;      /* amount of data now in save_buffer */
01318    png_size_t save_buffer_max;       /* total size of save_buffer */
01319    png_size_t buffer_size;           /* total amount of available input data */
01320    png_size_t current_buffer_size;   /* amount of data now in current_buffer */
01321    int process_mode;                 /* what push library is currently doing */
01322    int cur_palette;                  /* current push library palette index */
01323 
01324 #  if defined(PNG_TEXT_SUPPORTED)
01325      png_size_t current_text_size;   /* current size of text input data */
01326      png_size_t current_text_left;   /* how much text left to read in input */
01327      png_charp current_text;         /* current text chunk buffer */
01328      png_charp current_text_ptr;     /* current location in current_text */
01329 #  endif /* PNG_TEXT_SUPPORTED */
01330 #endif /* PNG_PROGRESSIVE_READ_SUPPORTED */
01331 
01332 #if defined(__TURBOC__) && !defined(_Windows) && !defined(__FLAT__)
01333 /* for the Borland special 64K segment handler */
01334    png_bytepp offset_table_ptr;
01335    png_bytep offset_table;
01336    png_uint_16 offset_table_number;
01337    png_uint_16 offset_table_count;
01338    png_uint_16 offset_table_count_free;
01339 #endif
01340 
01341 #if defined(PNG_READ_DITHER_SUPPORTED)
01342    png_bytep palette_lookup;         /* lookup table for dithering */
01343    png_bytep dither_index;           /* index translation for palette files */
01344 #endif
01345 
01346 #if defined(PNG_READ_DITHER_SUPPORTED) || defined(PNG_hIST_SUPPORTED)
01347    png_uint_16p hist;                /* histogram */
01348 #endif
01349 
01350 #if defined(PNG_WRITE_WEIGHTED_FILTER_SUPPORTED)
01351    png_byte heuristic_method;        /* heuristic for row filter selection */
01352    png_byte num_prev_filters;        /* number of weights for previous rows */
01353    png_bytep prev_filters;           /* filter type(s) of previous row(s) */
01354    png_uint_16p filter_weights;      /* weight(s) for previous line(s) */
01355    png_uint_16p inv_filter_weights;  /* 1/weight(s) for previous line(s) */
01356    png_uint_16p filter_costs;        /* relative filter calculation cost */
01357    png_uint_16p inv_filter_costs;    /* 1/relative filter calculation cost */
01358 #endif
01359 
01360 #if defined(PNG_TIME_RFC1123_SUPPORTED)
01361    png_charp time_buffer;            /* String to hold RFC 1123 time text */
01362 #endif
01363 
01364 /* New members added in libpng-1.0.6 */
01365 
01366 #ifdef PNG_FREE_ME_SUPPORTED
01367    png_uint_32 free_me;       /* flags items libpng is responsible for freeing */
01368 #endif
01369 
01370 #if defined(PNG_USER_CHUNKS_SUPPORTED)
01371    png_voidp user_chunk_ptr;
01372    png_user_chunk_ptr read_user_chunk_fn; /* user read chunk handler */
01373 #endif
01374 
01375 #if defined(PNG_UNKNOWN_CHUNKS_SUPPORTED)
01376    int num_chunk_list;
01377    png_bytep chunk_list;
01378 #endif
01379 
01380 /* New members added in libpng-1.0.3 */
01381 #if defined(PNG_READ_RGB_TO_GRAY_SUPPORTED)
01382    png_byte rgb_to_gray_status;
01383    /* These were changed from png_byte in libpng-1.0.6 */
01384    png_uint_16 rgb_to_gray_red_coeff;
01385    png_uint_16 rgb_to_gray_green_coeff;
01386    png_uint_16 rgb_to_gray_blue_coeff;
01387 #endif
01388 
01389 /* New member added in libpng-1.0.4 (renamed in 1.0.9) */
01390 #if defined(PNG_MNG_FEATURES_SUPPORTED) || \
01391     defined(PNG_READ_EMPTY_PLTE_SUPPORTED) || \
01392     defined(PNG_WRITE_EMPTY_PLTE_SUPPORTED)
01393 /* changed from png_byte to png_uint_32 at version 1.2.0 */
01394 #ifdef PNG_1_0_X
01395    png_byte mng_features_permitted;
01396 #else
01397    png_uint_32 mng_features_permitted;
01398 #endif /* PNG_1_0_X */
01399 #endif
01400 
01401 /* New member added in libpng-1.0.7 */
01402 #if defined(PNG_READ_GAMMA_SUPPORTED) || defined(PNG_READ_BACKGROUND_SUPPORTED)
01403    png_fixed_point int_gamma;
01404 #endif
01405 
01406 /* New member added in libpng-1.0.9, ifdef'ed out in 1.0.12, enabled in 1.2.0 */
01407 #if defined(PNG_MNG_FEATURES_SUPPORTED)
01408    png_byte filter_type;
01409 #endif
01410 
01411 #if defined(PNG_1_0_X)
01412 /* New member added in libpng-1.0.10, ifdef'ed out in 1.2.0 */
01413    png_uint_32 row_buf_size;
01414 #endif
01415 
01416 /* New members added in libpng-1.2.0 */
01417 #if defined(PNG_ASSEMBLER_CODE_SUPPORTED)
01418 #  if !defined(PNG_1_0_X)
01419 #    if defined(PNG_MMX_CODE_SUPPORTED)
01420    png_byte     mmx_bitdepth_threshold;
01421    png_uint_32  mmx_rowbytes_threshold;
01422 #    endif
01423    png_uint_32  asm_flags;
01424 #  endif
01425 #endif
01426 
01427 /* New members added in libpng-1.0.2 but first enabled by default in 1.2.0 */
01428 #ifdef PNG_USER_MEM_SUPPORTED
01429    png_voidp mem_ptr;                /* user supplied struct for mem functions */
01430    png_malloc_ptr malloc_fn;         /* function for allocating memory */
01431    png_free_ptr free_fn;             /* function for freeing memory */
01432 #endif
01433 
01434 /* New member added in libpng-1.0.13 and 1.2.0 */
01435    png_bytep big_row_buf;         /* buffer to save current (unfiltered) row */
01436 
01437 #if defined(PNG_READ_DITHER_SUPPORTED)
01438 /* The following three members were added at version 1.0.14 and 1.2.4 */
01439    png_bytep dither_sort;            /* working sort array */
01440    png_bytep index_to_palette;       /* where the original index currently is */
01441                                      /* in the palette */
01442    png_bytep palette_to_index;       /* which original index points to this */
01443                                      /* palette color */
01444 #endif
01445 
01446 /* New members added in libpng-1.0.16 and 1.2.6 */
01447    png_byte compression_type;
01448 
01449 #ifdef PNG_SET_USER_LIMITS_SUPPORTED
01450    png_uint_32 user_width_max;
01451    png_uint_32 user_height_max;
01452 #endif
01453 
01454 /* New member added in libpng-1.0.25 and 1.2.17 */
01455 #if defined(PNG_UNKNOWN_CHUNKS_SUPPORTED)
01456    /* storage for unknown chunk that the library doesn't recognize. */
01457    png_unknown_chunk unknown_chunk;
01458 #endif
01459 
01460 /* New members added in libpng-1.2.26 */
01461   png_uint_32 old_big_row_buf_size, old_prev_row_size;
01462 
01463 /* New member added in libpng-1.2.30 */
01464   png_charp chunkdata;  /* buffer for reading chunk data */
01465 
01466 };
01467 
01468 
01469 /* This triggers a compiler error in png.c, if png.c and png.h
01470  * do not agree upon the version number.
01471  */
01472 typedef png_structp version_1_2_32;
01473 
01474 typedef png_struct FAR * FAR * png_structpp;
01475 
01476 /* Here are the function definitions most commonly used.  This is not
01477  * the place to find out how to use libpng.  See libpng.txt for the
01478  * full explanation, see example.c for the summary.  This just provides
01479  * a simple one line description of the use of each function.
01480  */
01481 
01482 /* Returns the version number of the library */
01483 extern PNG_EXPORT(png_uint_32,png_access_version_number) PNGARG((void));
01484 
01485 /* Tell lib we have already handled the first <num_bytes> magic bytes.
01486  * Handling more than 8 bytes from the beginning of the file is an error.
01487  */
01488 extern PNG_EXPORT(void,png_set_sig_bytes) PNGARG((png_structp png_ptr,
01489    int num_bytes));
01490 
01491 /* Check sig[start] through sig[start + num_to_check - 1] to see if it's a
01492  * PNG file.  Returns zero if the supplied bytes match the 8-byte PNG
01493  * signature, and non-zero otherwise.  Having num_to_check == 0 or
01494  * start > 7 will always fail (ie return non-zero).
01495  */
01496 extern PNG_EXPORT(int,png_sig_cmp) PNGARG((png_bytep sig, png_size_t start,
01497    png_size_t num_to_check));
01498 
01499 /* Simple signature checking function.  This is the same as calling
01500  * png_check_sig(sig, n) := !png_sig_cmp(sig, 0, n).
01501  */
01502 extern PNG_EXPORT(int,png_check_sig) PNGARG((png_bytep sig, int num));
01503 
01504 /* Allocate and initialize png_ptr struct for reading, and any other memory. */
01505 extern PNG_EXPORT(png_structp,png_create_read_struct)
01506    PNGARG((png_const_charp user_png_ver, png_voidp error_ptr,
01507    png_error_ptr error_fn, png_error_ptr warn_fn));
01508 
01509 /* Allocate and initialize png_ptr struct for writing, and any other memory */
01510 extern PNG_EXPORT(png_structp,png_create_write_struct)
01511    PNGARG((png_const_charp user_png_ver, png_voidp error_ptr,
01512    png_error_ptr error_fn, png_error_ptr warn_fn));
01513 
01514 #ifdef PNG_WRITE_SUPPORTED
01515 extern PNG_EXPORT(png_uint_32,png_get_compression_buffer_size)
01516    PNGARG((png_structp png_ptr));
01517 #endif
01518 
01519 #ifdef PNG_WRITE_SUPPORTED
01520 extern PNG_EXPORT(void,png_set_compression_buffer_size)
01521    PNGARG((png_structp png_ptr, png_uint_32 size));
01522 #endif
01523 
01524 /* Reset the compression stream */
01525 extern PNG_EXPORT(int,png_reset_zstream) PNGARG((png_structp png_ptr));
01526 
01527 /* New functions added in libpng-1.0.2 (not enabled by default until 1.2.0) */
01528 #ifdef PNG_USER_MEM_SUPPORTED
01529 extern PNG_EXPORT(png_structp,png_create_read_struct_2)
01530    PNGARG((png_const_charp user_png_ver, png_voidp error_ptr,
01531    png_error_ptr error_fn, png_error_ptr warn_fn, png_voidp mem_ptr,
01532    png_malloc_ptr malloc_fn, png_free_ptr free_fn));
01533 extern PNG_EXPORT(png_structp,png_create_write_struct_2)
01534    PNGARG((png_const_charp user_png_ver, png_voidp error_ptr,
01535    png_error_ptr error_fn, png_error_ptr warn_fn, png_voidp mem_ptr,
01536    png_malloc_ptr malloc_fn, png_free_ptr free_fn));
01537 #endif
01538 
01539 /* Write a PNG chunk - size, type, (optional) data, CRC. */
01540 extern PNG_EXPORT(void,png_write_chunk) PNGARG((png_structp png_ptr,
01541    png_bytep chunk_name, png_bytep data, png_size_t length));
01542 
01543 /* Write the start of a PNG chunk - length and chunk name. */
01544 extern PNG_EXPORT(void,png_write_chunk_start) PNGARG((png_structp png_ptr,
01545    png_bytep chunk_name, png_uint_32 length));
01546 
01547 /* Write the data of a PNG chunk started with png_write_chunk_start(). */
01548 extern PNG_EXPORT(void,png_write_chunk_data) PNGARG((png_structp png_ptr,
01549    png_bytep data, png_size_t length));
01550 
01551 /* Finish a chunk started with png_write_chunk_start() (includes CRC). */
01552 extern PNG_EXPORT(void,png_write_chunk_end) PNGARG((png_structp png_ptr));
01553 
01554 /* Allocate and initialize the info structure */
01555 extern PNG_EXPORT(png_infop,png_create_info_struct)
01556    PNGARG((png_structp png_ptr));
01557 
01558 #if defined(PNG_1_0_X) || defined (PNG_1_2_X)
01559 /* Initialize the info structure (old interface - DEPRECATED) */
01560 extern PNG_EXPORT(void,png_info_init) PNGARG((png_infop info_ptr));
01561 #undef png_info_init
01562 #define png_info_init(info_ptr) png_info_init_3(&info_ptr,\
01563     png_sizeof(png_info));
01564 #endif
01565 
01566 extern PNG_EXPORT(void,png_info_init_3) PNGARG((png_infopp info_ptr,
01567     png_size_t png_info_struct_size));
01568 
01569 /* Writes all the PNG information before the image. */
01570 extern PNG_EXPORT(void,png_write_info_before_PLTE) PNGARG((png_structp png_ptr,
01571    png_infop info_ptr));
01572 extern PNG_EXPORT(void,png_write_info) PNGARG((png_structp png_ptr,
01573    png_infop info_ptr));
01574 
01575 #ifndef PNG_NO_SEQUENTIAL_READ_SUPPORTED
01576 /* read the information before the actual image data. */
01577 extern PNG_EXPORT(void,png_read_info) PNGARG((png_structp png_ptr,
01578    png_infop info_ptr));
01579 #endif
01580 
01581 #if defined(PNG_TIME_RFC1123_SUPPORTED)
01582 extern PNG_EXPORT(png_charp,png_convert_to_rfc1123)
01583    PNGARG((png_structp png_ptr, png_timep ptime));
01584 #endif
01585 
01586 #if !defined(_WIN32_WCE)
01587 /* "time.h" functions are not supported on WindowsCE */
01588 #if defined(PNG_WRITE_tIME_SUPPORTED)
01589 /* convert from a struct tm to png_time */
01590 extern PNG_EXPORT(void,png_convert_from_struct_tm) PNGARG((png_timep ptime,
01591    struct tm FAR * ttime));
01592 
01593 /* convert from time_t to png_time.  Uses gmtime() */
01594 extern PNG_EXPORT(void,png_convert_from_time_t) PNGARG((png_timep ptime,
01595    time_t ttime));
01596 #endif /* PNG_WRITE_tIME_SUPPORTED */
01597 #endif /* _WIN32_WCE */
01598 
01599 #if defined(PNG_READ_EXPAND_SUPPORTED)
01600 /* Expand data to 24-bit RGB, or 8-bit grayscale, with alpha if available. */
01601 extern PNG_EXPORT(void,png_set_expand) PNGARG((png_structp png_ptr));
01602 #if !defined(PNG_1_0_X)
01603 extern PNG_EXPORT(void,png_set_expand_gray_1_2_4_to_8) PNGARG((png_structp
01604   png_ptr));
01605 #endif
01606 extern PNG_EXPORT(void,png_set_palette_to_rgb) PNGARG((png_structp png_ptr));
01607 extern PNG_EXPORT(void,png_set_tRNS_to_alpha) PNGARG((png_structp png_ptr));
01608 #if defined(PNG_1_0_X) || defined (PNG_1_2_X)
01609 /* Deprecated */
01610 extern PNG_EXPORT(void,png_set_gray_1_2_4_to_8) PNGARG((png_structp png_ptr));
01611 #endif
01612 #endif
01613 
01614 #if defined(PNG_READ_BGR_SUPPORTED) || defined(PNG_WRITE_BGR_SUPPORTED)
01615 /* Use blue, green, red order for pixels. */
01616 extern PNG_EXPORT(void,png_set_bgr) PNGARG((png_structp png_ptr));
01617 #endif
01618 
01619 #if defined(PNG_READ_GRAY_TO_RGB_SUPPORTED)
01620 /* Expand the grayscale to 24-bit RGB if necessary. */
01621 extern PNG_EXPORT(void,png_set_gray_to_rgb) PNGARG((png_structp png_ptr));
01622 #endif
01623 
01624 #if defined(PNG_READ_RGB_TO_GRAY_SUPPORTED)
01625 /* Reduce RGB to grayscale. */
01626 #ifdef PNG_FLOATING_POINT_SUPPORTED
01627 extern PNG_EXPORT(void,png_set_rgb_to_gray) PNGARG((png_structp png_ptr,
01628    int error_action, double red, double green ));
01629 #endif
01630 extern PNG_EXPORT(void,png_set_rgb_to_gray_fixed) PNGARG((png_structp png_ptr,
01631    int error_action, png_fixed_point red, png_fixed_point green ));
01632 extern PNG_EXPORT(png_byte,png_get_rgb_to_gray_status) PNGARG((png_structp
01633    png_ptr));
01634 #endif
01635 
01636 extern PNG_EXPORT(void,png_build_grayscale_palette) PNGARG((int bit_depth,
01637    png_colorp palette));
01638 
01639 #if defined(PNG_READ_STRIP_ALPHA_SUPPORTED)
01640 extern PNG_EXPORT(void,png_set_strip_alpha) PNGARG((png_structp png_ptr));
01641 #endif
01642 
01643 #if defined(PNG_READ_SWAP_ALPHA_SUPPORTED) || \
01644     defined(PNG_WRITE_SWAP_ALPHA_SUPPORTED)
01645 extern PNG_EXPORT(void,png_set_swap_alpha) PNGARG((png_structp png_ptr));
01646 #endif
01647 
01648 #if defined(PNG_READ_INVERT_ALPHA_SUPPORTED) || \
01649     defined(PNG_WRITE_INVERT_ALPHA_SUPPORTED)
01650 extern PNG_EXPORT(void,png_set_invert_alpha) PNGARG((png_structp png_ptr));
01651 #endif
01652 
01653 #if defined(PNG_READ_FILLER_SUPPORTED) || defined(PNG_WRITE_FILLER_SUPPORTED)
01654 /* Add a filler byte to 8-bit Gray or 24-bit RGB images. */
01655 extern PNG_EXPORT(void,png_set_filler) PNGARG((png_structp png_ptr,
01656    png_uint_32 filler, int flags));
01657 /* The values of the PNG_FILLER_ defines should NOT be changed */
01658 #define PNG_FILLER_BEFORE 0
01659 #define PNG_FILLER_AFTER 1
01660 /* Add an alpha byte to 8-bit Gray or 24-bit RGB images. */
01661 #if !defined(PNG_1_0_X)
01662 extern PNG_EXPORT(void,png_set_add_alpha) PNGARG((png_structp png_ptr,
01663    png_uint_32 filler, int flags));
01664 #endif
01665 #endif /* PNG_READ_FILLER_SUPPORTED || PNG_WRITE_FILLER_SUPPORTED */
01666 
01667 #if defined(PNG_READ_SWAP_SUPPORTED) || defined(PNG_WRITE_SWAP_SUPPORTED)
01668 /* Swap bytes in 16-bit depth files. */
01669 extern PNG_EXPORT(void,png_set_swap) PNGARG((png_structp png_ptr));
01670 #endif
01671 
01672 #if defined(PNG_READ_PACK_SUPPORTED) || defined(PNG_WRITE_PACK_SUPPORTED)
01673 /* Use 1 byte per pixel in 1, 2, or 4-bit depth files. */
01674 extern PNG_EXPORT(void,png_set_packing) PNGARG((png_structp png_ptr));
01675 #endif
01676 
01677 #if defined(PNG_READ_PACKSWAP_SUPPORTED) || defined(PNG_WRITE_PACKSWAP_SUPPORTED)
01678 /* Swap packing order of pixels in bytes. */
01679 extern PNG_EXPORT(void,png_set_packswap) PNGARG((png_structp png_ptr));
01680 #endif
01681 
01682 #if defined(PNG_READ_SHIFT_SUPPORTED) || defined(PNG_WRITE_SHIFT_SUPPORTED)
01683 /* Converts files to legal bit depths. */
01684 extern PNG_EXPORT(void,png_set_shift) PNGARG((png_structp png_ptr,
01685    png_color_8p true_bits));
01686 #endif
01687 
01688 #if defined(PNG_READ_INTERLACING_SUPPORTED) || \
01689     defined(PNG_WRITE_INTERLACING_SUPPORTED)
01690 /* Have the code handle the interlacing.  Returns the number of passes. */
01691 extern PNG_EXPORT(int,png_set_interlace_handling) PNGARG((png_structp png_ptr));
01692 #endif
01693 
01694 #if defined(PNG_READ_INVERT_SUPPORTED) || defined(PNG_WRITE_INVERT_SUPPORTED)
01695 /* Invert monochrome files */
01696 extern PNG_EXPORT(void,png_set_invert_mono) PNGARG((png_structp png_ptr));
01697 #endif
01698 
01699 #if defined(PNG_READ_BACKGROUND_SUPPORTED)
01700 /* Handle alpha and tRNS by replacing with a background color. */
01701 #ifdef PNG_FLOATING_POINT_SUPPORTED
01702 extern PNG_EXPORT(void,png_set_background) PNGARG((png_structp png_ptr,
01703    png_color_16p background_color, int background_gamma_code,
01704    int need_expand, double background_gamma));
01705 #endif
01706 #define PNG_BACKGROUND_GAMMA_UNKNOWN 0
01707 #define PNG_BACKGROUND_GAMMA_SCREEN  1
01708 #define PNG_BACKGROUND_GAMMA_FILE    2
01709 #define PNG_BACKGROUND_GAMMA_UNIQUE  3
01710 #endif
01711 
01712 #if defined(PNG_READ_16_TO_8_SUPPORTED)
01713 /* strip the second byte of information from a 16-bit depth file. */
01714 extern PNG_EXPORT(void,png_set_strip_16) PNGARG((png_structp png_ptr));
01715 #endif
01716 
01717 #if defined(PNG_READ_DITHER_SUPPORTED)
01718 /* Turn on dithering, and reduce the palette to the number of colors available. */
01719 extern PNG_EXPORT(void,png_set_dither) PNGARG((png_structp png_ptr,
01720    png_colorp palette, int num_palette, int maximum_colors,
01721    png_uint_16p histogram, int full_dither));
01722 #endif
01723 
01724 #if defined(PNG_READ_GAMMA_SUPPORTED)
01725 /* Handle gamma correction. Screen_gamma=(display_exponent) */
01726 #ifdef PNG_FLOATING_POINT_SUPPORTED
01727 extern PNG_EXPORT(void,png_set_gamma) PNGARG((png_structp png_ptr,
01728    double screen_gamma, double default_file_gamma));
01729 #endif
01730 #endif
01731 
01732 #if defined(PNG_1_0_X) || defined (PNG_1_2_X)
01733 #if defined(PNG_READ_EMPTY_PLTE_SUPPORTED) || \
01734     defined(PNG_WRITE_EMPTY_PLTE_SUPPORTED)
01735 /* Permit or disallow empty PLTE (0: not permitted, 1: permitted) */
01736 /* Deprecated and will be removed.  Use png_permit_mng_features() instead. */
01737 extern PNG_EXPORT(void,png_permit_empty_plte) PNGARG((png_structp png_ptr,
01738    int empty_plte_permitted));
01739 #endif
01740 #endif
01741 
01742 #if defined(PNG_WRITE_FLUSH_SUPPORTED)
01743 /* Set how many lines between output flushes - 0 for no flushing */
01744 extern PNG_EXPORT(void,png_set_flush) PNGARG((png_structp png_ptr, int nrows));
01745 /* Flush the current PNG output buffer */
01746 extern PNG_EXPORT(void,png_write_flush) PNGARG((png_structp png_ptr));
01747 #endif
01748 
01749 /* optional update palette with requested transformations */
01750 extern PNG_EXPORT(void,png_start_read_image) PNGARG((png_structp png_ptr));
01751 
01752 /* optional call to update the users info structure */
01753 extern PNG_EXPORT(void,png_read_update_info) PNGARG((png_structp png_ptr,
01754    png_infop info_ptr));
01755 
01756 #ifndef PNG_NO_SEQUENTIAL_READ_SUPPORTED
01757 /* read one or more rows of image data. */
01758 extern PNG_EXPORT(void,png_read_rows) PNGARG((png_structp png_ptr,
01759    png_bytepp row, png_bytepp display_row, png_uint_32 num_rows));
01760 #endif
01761 
01762 #ifndef PNG_NO_SEQUENTIAL_READ_SUPPORTED
01763 /* read a row of data. */
01764 extern PNG_EXPORT(void,png_read_row) PNGARG((png_structp png_ptr,
01765    png_bytep row,
01766    png_bytep display_row));
01767 #endif
01768 
01769 #ifndef PNG_NO_SEQUENTIAL_READ_SUPPORTED
01770 /* read the whole image into memory at once. */
01771 extern PNG_EXPORT(void,png_read_image) PNGARG((png_structp png_ptr,
01772    png_bytepp image));
01773 #endif
01774 
01775 /* write a row of image data */
01776 extern PNG_EXPORT(void,png_write_row) PNGARG((png_structp png_ptr,
01777    png_bytep row));
01778 
01779 /* write a few rows of image data */
01780 extern PNG_EXPORT(void,png_write_rows) PNGARG((png_structp png_ptr,
01781    png_bytepp row, png_uint_32 num_rows));
01782 
01783 /* write the image data */
01784 extern PNG_EXPORT(void,png_write_image) PNGARG((png_structp png_ptr,
01785    png_bytepp image));
01786 
01787 /* writes the end of the PNG file. */
01788 extern PNG_EXPORT(void,png_write_end) PNGARG((png_structp png_ptr,
01789    png_infop info_ptr));
01790 
01791 #ifndef PNG_NO_SEQUENTIAL_READ_SUPPORTED
01792 /* read the end of the PNG file. */
01793 extern PNG_EXPORT(void,png_read_end) PNGARG((png_structp png_ptr,
01794    png_infop info_ptr));
01795 #endif
01796 
01797 /* free any memory associated with the png_info_struct */
01798 extern PNG_EXPORT(void,png_destroy_info_struct) PNGARG((png_structp png_ptr,
01799    png_infopp info_ptr_ptr));
01800 
01801 /* free any memory associated with the png_struct and the png_info_structs */
01802 extern PNG_EXPORT(void,png_destroy_read_struct) PNGARG((png_structpp
01803    png_ptr_ptr, png_infopp info_ptr_ptr, png_infopp end_info_ptr_ptr));
01804 
01805 /* free all memory used by the read (old method - NOT DLL EXPORTED) */
01806 extern void png_read_destroy PNGARG((png_structp png_ptr, png_infop info_ptr,
01807    png_infop end_info_ptr));
01808 
01809 /* free any memory associated with the png_struct and the png_info_structs */
01810 extern PNG_EXPORT(void,png_destroy_write_struct)
01811    PNGARG((png_structpp png_ptr_ptr, png_infopp info_ptr_ptr));
01812 
01813 /* free any memory used in png_ptr struct (old method - NOT DLL EXPORTED) */
01814 extern void png_write_destroy PNGARG((png_structp png_ptr));
01815 
01816 /* set the libpng method of handling chunk CRC errors */
01817 extern PNG_EXPORT(void,png_set_crc_action) PNGARG((png_structp png_ptr,
01818    int crit_action, int ancil_action));
01819 
01820 /* Values for png_set_crc_action() to say how to handle CRC errors in
01821  * ancillary and critical chunks, and whether to use the data contained
01822  * therein.  Note that it is impossible to "discard" data in a critical
01823  * chunk.  For versions prior to 0.90, the action was always error/quit,
01824  * whereas in version 0.90 and later, the action for CRC errors in ancillary
01825  * chunks is warn/discard.  These values should NOT be changed.
01826  *
01827  *      value                       action:critical     action:ancillary
01828  */
01829 #define PNG_CRC_DEFAULT       0  /* error/quit          warn/discard data */
01830 #define PNG_CRC_ERROR_QUIT    1  /* error/quit          error/quit        */
01831 #define PNG_CRC_WARN_DISCARD  2  /* (INVALID)           warn/discard data */
01832 #define PNG_CRC_WARN_USE      3  /* warn/use data       warn/use data     */
01833 #define PNG_CRC_QUIET_USE     4  /* quiet/use data      quiet/use data    */
01834 #define PNG_CRC_NO_CHANGE     5  /* use current value   use current value */
01835 
01836 /* These functions give the user control over the scan-line filtering in
01837  * libpng and the compression methods used by zlib.  These functions are
01838  * mainly useful for testing, as the defaults should work with most users.
01839  * Those users who are tight on memory or want faster performance at the
01840  * expense of compression can modify them.  See the compression library
01841  * header file (zlib.h) for an explination of the compression functions.
01842  */
01843 
01844 /* set the filtering method(s) used by libpng.  Currently, the only valid
01845  * value for "method" is 0.
01846  */
01847 extern PNG_EXPORT(void,png_set_filter) PNGARG((png_structp png_ptr, int method,
01848    int filters));
01849 
01850 /* Flags for png_set_filter() to say which filters to use.  The flags
01851  * are chosen so that they don't conflict with real filter types
01852  * below, in case they are supplied instead of the #defined constants.
01853  * These values should NOT be changed.
01854  */
01855 #define PNG_NO_FILTERS     0x00
01856 #define PNG_FILTER_NONE    0x08
01857 #define PNG_FILTER_SUB     0x10
01858 #define PNG_FILTER_UP      0x20
01859 #define PNG_FILTER_AVG     0x40
01860 #define PNG_FILTER_PAETH   0x80
01861 #define PNG_ALL_FILTERS (PNG_FILTER_NONE | PNG_FILTER_SUB | PNG_FILTER_UP | \
01862                          PNG_FILTER_AVG | PNG_FILTER_PAETH)
01863 
01864 /* Filter values (not flags) - used in pngwrite.c, pngwutil.c for now.
01865  * These defines should NOT be changed.
01866  */
01867 #define PNG_FILTER_VALUE_NONE  0
01868 #define PNG_FILTER_VALUE_SUB   1
01869 #define PNG_FILTER_VALUE_UP    2
01870 #define PNG_FILTER_VALUE_AVG   3
01871 #define PNG_FILTER_VALUE_PAETH 4
01872 #define PNG_FILTER_VALUE_LAST  5
01873 
01874 #if defined(PNG_WRITE_WEIGHTED_FILTER_SUPPORTED) /* EXPERIMENTAL */
01875 /* The "heuristic_method" is given by one of the PNG_FILTER_HEURISTIC_
01876  * defines, either the default (minimum-sum-of-absolute-differences), or
01877  * the experimental method (weighted-minimum-sum-of-absolute-differences).
01878  *
01879  * Weights are factors >= 1.0, indicating how important it is to keep the
01880  * filter type consistent between rows.  Larger numbers mean the current
01881  * filter is that many times as likely to be the same as the "num_weights"
01882  * previous filters.  This is cumulative for each previous row with a weight.
01883  * There needs to be "num_weights" values in "filter_weights", or it can be
01884  * NULL if the weights aren't being specified.  Weights have no influence on
01885  * the selection of the first row filter.  Well chosen weights can (in theory)
01886  * improve the compression for a given image.
01887  *
01888  * Costs are factors >= 1.0 indicating the relative decoding costs of a
01889  * filter type.  Higher costs indicate more decoding expense, and are
01890  * therefore less likely to be selected over a filter with lower computational
01891  * costs.  There needs to be a value in "filter_costs" for each valid filter
01892  * type (given by PNG_FILTER_VALUE_LAST), or it can be NULL if you aren't
01893  * setting the costs.  Costs try to improve the speed of decompression without
01894  * unduly increasing the compressed image size.
01895  *
01896  * A negative weight or cost indicates the default value is to be used, and
01897  * values in the range [0.0, 1.0) indicate the value is to remain unchanged.
01898  * The default values for both weights and costs are currently 1.0, but may
01899  * change if good general weighting/cost heuristics can be found.  If both
01900  * the weights and costs are set to 1.0, this degenerates the WEIGHTED method
01901  * to the UNWEIGHTED method, but with added encoding time/computation.
01902  */
01903 #ifdef PNG_FLOATING_POINT_SUPPORTED
01904 extern PNG_EXPORT(void,png_set_filter_heuristics) PNGARG((png_structp png_ptr,
01905    int heuristic_method, int num_weights, png_doublep filter_weights,
01906    png_doublep filter_costs));
01907 #endif
01908 #endif /*  PNG_WRITE_WEIGHTED_FILTER_SUPPORTED */
01909 
01910 /* Heuristic used for row filter selection.  These defines should NOT be
01911  * changed.
01912  */
01913 #define PNG_FILTER_HEURISTIC_DEFAULT    0  /* Currently "UNWEIGHTED" */
01914 #define PNG_FILTER_HEURISTIC_UNWEIGHTED 1  /* Used by libpng < 0.95 */
01915 #define PNG_FILTER_HEURISTIC_WEIGHTED   2  /* Experimental feature */
01916 #define PNG_FILTER_HEURISTIC_LAST       3  /* Not a valid value */
01917 
01918 /* Set the library compression level.  Currently, valid values range from
01919  * 0 - 9, corresponding directly to the zlib compression levels 0 - 9
01920  * (0 - no compression, 9 - "maximal" compression).  Note that tests have
01921  * shown that zlib compression levels 3-6 usually perform as well as level 9
01922  * for PNG images, and do considerably fewer caclulations.  In the future,
01923  * these values may not correspond directly to the zlib compression levels.
01924  */
01925 extern PNG_EXPORT(void,png_set_compression_level) PNGARG((png_structp png_ptr,
01926    int level));
01927 
01928 extern PNG_EXPORT(void,png_set_compression_mem_level)
01929    PNGARG((png_structp png_ptr, int mem_level));
01930 
01931 extern PNG_EXPORT(void,png_set_compression_strategy)
01932    PNGARG((png_structp png_ptr, int strategy));
01933 
01934 extern PNG_EXPORT(void,png_set_compression_window_bits)
01935    PNGARG((png_structp png_ptr, int window_bits));
01936 
01937 extern PNG_EXPORT(void,png_set_compression_method) PNGARG((png_structp png_ptr,
01938    int method));
01939 
01940 /* These next functions are called for input/output, memory, and error
01941  * handling.  They are in the file pngrio.c, pngwio.c, and pngerror.c,
01942  * and call standard C I/O routines such as fread(), fwrite(), and
01943  * fprintf().  These functions can be made to use other I/O routines
01944  * at run time for those applications that need to handle I/O in a
01945  * different manner by calling png_set_???_fn().  See libpng.txt for
01946  * more information.
01947  */
01948 
01949 #if !defined(PNG_NO_STDIO)
01950 /* Initialize the input/output for the PNG file to the default functions. */
01951 extern PNG_EXPORT(void,png_init_io) PNGARG((png_structp png_ptr, png_FILE_p fp));
01952 #endif
01953 
01954 /* Replace the (error and abort), and warning functions with user
01955  * supplied functions.  If no messages are to be printed you must still
01956  * write and use replacement functions. The replacement error_fn should
01957  * still do a longjmp to the last setjmp location if you are using this
01958  * method of error handling.  If error_fn or warning_fn is NULL, the
01959  * default function will be used.
01960  */
01961 
01962 extern PNG_EXPORT(void,png_set_error_fn) PNGARG((png_structp png_ptr,
01963    png_voidp error_ptr, png_error_ptr error_fn, png_error_ptr warning_fn));
01964 
01965 /* Return the user pointer associated with the error functions */
01966 extern PNG_EXPORT(png_voidp,png_get_error_ptr) PNGARG((png_structp png_ptr));
01967 
01968 /* Replace the default data output functions with a user supplied one(s).
01969  * If buffered output is not used, then output_flush_fn can be set to NULL.
01970  * If PNG_WRITE_FLUSH_SUPPORTED is not defined at libpng compile time
01971  * output_flush_fn will be ignored (and thus can be NULL).
01972  */
01973 extern PNG_EXPORT(void,png_set_write_fn) PNGARG((png_structp png_ptr,
01974    png_voidp io_ptr, png_rw_ptr write_data_fn, png_flush_ptr output_flush_fn));
01975 
01976 /* Replace the default data input function with a user supplied one. */
01977 extern PNG_EXPORT(void,png_set_read_fn) PNGARG((png_structp png_ptr,
01978    png_voidp io_ptr, png_rw_ptr read_data_fn));
01979 
01980 /* Return the user pointer associated with the I/O functions */
01981 extern PNG_EXPORT(png_voidp,png_get_io_ptr) PNGARG((png_structp png_ptr));
01982 
01983 extern PNG_EXPORT(void,png_set_read_status_fn) PNGARG((png_structp png_ptr,
01984    png_read_status_ptr read_row_fn));
01985 
01986 extern PNG_EXPORT(void,png_set_write_status_fn) PNGARG((png_structp png_ptr,
01987    png_write_status_ptr write_row_fn));
01988 
01989 #ifdef PNG_USER_MEM_SUPPORTED
01990 /* Replace the default memory allocation functions with user supplied one(s). */
01991 extern PNG_EXPORT(void,png_set_mem_fn) PNGARG((png_structp png_ptr,
01992    png_voidp mem_ptr, png_malloc_ptr malloc_fn, png_free_ptr free_fn));
01993 /* Return the user pointer associated with the memory functions */
01994 extern PNG_EXPORT(png_voidp,png_get_mem_ptr) PNGARG((png_structp png_ptr));
01995 #endif
01996 
01997 #if defined(PNG_READ_USER_TRANSFORM_SUPPORTED) || \
01998     defined(PNG_LEGACY_SUPPORTED)
01999 extern PNG_EXPORT(void,png_set_read_user_transform_fn) PNGARG((png_structp
02000    png_ptr, png_user_transform_ptr read_user_transform_fn));
02001 #endif
02002 
02003 #if defined(PNG_WRITE_USER_TRANSFORM_SUPPORTED) || \
02004     defined(PNG_LEGACY_SUPPORTED)
02005 extern PNG_EXPORT(void,png_set_write_user_transform_fn) PNGARG((png_structp
02006    png_ptr, png_user_transform_ptr write_user_transform_fn));
02007 #endif
02008 
02009 #if defined(PNG_READ_USER_TRANSFORM_SUPPORTED) || \
02010     defined(PNG_WRITE_USER_TRANSFORM_SUPPORTED) || \
02011     defined(PNG_LEGACY_SUPPORTED)
02012 extern PNG_EXPORT(void,png_set_user_transform_info) PNGARG((png_structp
02013    png_ptr, png_voidp user_transform_ptr, int user_transform_depth,
02014    int user_transform_channels));
02015 /* Return the user pointer associated with the user transform functions */
02016 extern PNG_EXPORT(png_voidp,png_get_user_transform_ptr)
02017    PNGARG((png_structp png_ptr));
02018 #endif
02019 
02020 #ifdef PNG_USER_CHUNKS_SUPPORTED
02021 extern PNG_EXPORT(void,png_set_read_user_chunk_fn) PNGARG((png_structp png_ptr,
02022    png_voidp user_chunk_ptr, png_user_chunk_ptr read_user_chunk_fn));
02023 extern PNG_EXPORT(png_voidp,png_get_user_chunk_ptr) PNGARG((png_structp
02024    png_ptr));
02025 #endif
02026 
02027 #ifdef PNG_PROGRESSIVE_READ_SUPPORTED
02028 /* Sets the function callbacks for the push reader, and a pointer to a
02029  * user-defined structure available to the callback functions.
02030  */
02031 extern PNG_EXPORT(void,png_set_progressive_read_fn) PNGARG((png_structp png_ptr,
02032    png_voidp progressive_ptr,
02033    png_progressive_info_ptr info_fn, png_progressive_row_ptr row_fn,
02034    png_progressive_end_ptr end_fn));
02035 
02036 /* returns the user pointer associated with the push read functions */
02037 extern PNG_EXPORT(png_voidp,png_get_progressive_ptr)
02038    PNGARG((png_structp png_ptr));
02039 
02040 /* function to be called when data becomes available */
02041 extern PNG_EXPORT(void,png_process_data) PNGARG((png_structp png_ptr,
02042    png_infop info_ptr, png_bytep buffer, png_size_t buffer_size));
02043 
02044 /* function that combines rows.  Not very much different than the
02045  * png_combine_row() call.  Is this even used?????
02046  */
02047 extern PNG_EXPORT(void,png_progressive_combine_row) PNGARG((png_structp png_ptr,
02048    png_bytep old_row, png_bytep new_row));
02049 #endif /* PNG_PROGRESSIVE_READ_SUPPORTED */
02050 
02051 extern PNG_EXPORT(png_voidp,png_malloc) PNGARG((png_structp png_ptr,
02052    png_uint_32 size));
02053 
02054 #if defined(PNG_1_0_X)
02055 #  define png_malloc_warn png_malloc
02056 #else
02057 /* Added at libpng version 1.2.4 */
02058 extern PNG_EXPORT(png_voidp,png_malloc_warn) PNGARG((png_structp png_ptr,
02059    png_uint_32 size));
02060 #endif
02061 
02062 /* frees a pointer allocated by png_malloc() */
02063 extern PNG_EXPORT(void,png_free) PNGARG((png_structp png_ptr, png_voidp ptr));
02064 
02065 #if defined(PNG_1_0_X)
02066 /* Function to allocate memory for zlib. */
02067 extern PNG_EXPORT(voidpf,png_zalloc) PNGARG((voidpf png_ptr, uInt items,
02068    uInt size));
02069 
02070 /* Function to free memory for zlib */
02071 extern PNG_EXPORT(void,png_zfree) PNGARG((voidpf png_ptr, voidpf ptr));
02072 #endif
02073 
02074 /* Free data that was allocated internally */
02075 extern PNG_EXPORT(void,png_free_data) PNGARG((png_structp png_ptr,
02076    png_infop info_ptr, png_uint_32 free_me, int num));
02077 #ifdef PNG_FREE_ME_SUPPORTED
02078 /* Reassign responsibility for freeing existing data, whether allocated
02079  * by libpng or by the application */
02080 extern PNG_EXPORT(void,png_data_freer) PNGARG((png_structp png_ptr,
02081    png_infop info_ptr, int freer, png_uint_32 mask));
02082 #endif
02083 /* assignments for png_data_freer */
02084 #define PNG_DESTROY_WILL_FREE_DATA 1
02085 #define PNG_SET_WILL_FREE_DATA 1
02086 #define PNG_USER_WILL_FREE_DATA 2
02087 /* Flags for png_ptr->free_me and info_ptr->free_me */
02088 #define PNG_FREE_HIST 0x0008
02089 #define PNG_FREE_ICCP 0x0010
02090 #define PNG_FREE_SPLT 0x0020
02091 #define PNG_FREE_ROWS 0x0040
02092 #define PNG_FREE_PCAL 0x0080
02093 #define PNG_FREE_SCAL 0x0100
02094 #define PNG_FREE_UNKN 0x0200
02095 #define PNG_FREE_LIST 0x0400
02096 #define PNG_FREE_PLTE 0x1000
02097 #define PNG_FREE_TRNS 0x2000
02098 #define PNG_FREE_TEXT 0x4000
02099 #define PNG_FREE_ALL  0x7fff
02100 #define PNG_FREE_MUL  0x4220 /* PNG_FREE_SPLT|PNG_FREE_TEXT|PNG_FREE_UNKN */
02101 
02102 #ifdef PNG_USER_MEM_SUPPORTED
02103 extern PNG_EXPORT(png_voidp,png_malloc_default) PNGARG((png_structp png_ptr,
02104    png_uint_32 size));
02105 extern PNG_EXPORT(void,png_free_default) PNGARG((png_structp png_ptr,
02106    png_voidp ptr));
02107 #endif
02108 
02109 extern PNG_EXPORT(png_voidp,png_memcpy_check) PNGARG((png_structp png_ptr,
02110    png_voidp s1, png_voidp s2, png_uint_32 size));
02111 
02112 extern PNG_EXPORT(png_voidp,png_memset_check) PNGARG((png_structp png_ptr,
02113    png_voidp s1, int value, png_uint_32 size));
02114 
02115 #if defined(USE_FAR_KEYWORD)  /* memory model conversion function */
02116 extern void *png_far_to_near PNGARG((png_structp png_ptr,png_voidp ptr,
02117    int check));
02118 #endif /* USE_FAR_KEYWORD */
02119 
02120 #ifndef PNG_NO_ERROR_TEXT
02121 /* Fatal error in PNG image of libpng - can't continue */
02122 extern PNG_EXPORT(void,png_error) PNGARG((png_structp png_ptr,
02123    png_const_charp error_message));
02124 
02125 /* The same, but the chunk name is prepended to the error string. */
02126 extern PNG_EXPORT(void,png_chunk_error) PNGARG((png_structp png_ptr,
02127    png_const_charp error_message));
02128 #else
02129 /* Fatal error in PNG image of libpng - can't continue */
02130 extern PNG_EXPORT(void,png_err) PNGARG((png_structp png_ptr));
02131 #endif
02132 
02133 #ifndef PNG_NO_WARNINGS
02134 /* Non-fatal error in libpng.  Can continue, but may have a problem. */
02135 extern PNG_EXPORT(void,png_warning) PNGARG((png_structp png_ptr,
02136    png_const_charp warning_message));
02137 
02138 #ifdef PNG_READ_SUPPORTED
02139 /* Non-fatal error in libpng, chunk name is prepended to message. */
02140 extern PNG_EXPORT(void,png_chunk_warning) PNGARG((png_structp png_ptr,
02141    png_const_charp warning_message));
02142 #endif /* PNG_READ_SUPPORTED */
02143 #endif /* PNG_NO_WARNINGS */
02144 
02145 /* The png_set_<chunk> functions are for storing values in the png_info_struct.
02146  * Similarly, the png_get_<chunk> calls are used to read values from the
02147  * png_info_struct, either storing the parameters in the passed variables, or
02148  * setting pointers into the png_info_struct where the data is stored.  The
02149  * png_get_<chunk> functions return a non-zero value if the data was available
02150  * in info_ptr, or return zero and do not change any of the parameters if the
02151  * data was not available.
02152  *
02153  * These functions should be used instead of directly accessing png_info
02154  * to avoid problems with future changes in the size and internal layout of
02155  * png_info_struct.
02156  */
02157 /* Returns "flag" if chunk data is valid in info_ptr. */
02158 extern PNG_EXPORT(png_uint_32,png_get_valid) PNGARG((png_structp png_ptr,
02159 png_infop info_ptr, png_uint_32 flag));
02160 
02161 /* Returns number of bytes needed to hold a transformed row. */
02162 extern PNG_EXPORT(png_uint_32,png_get_rowbytes) PNGARG((png_structp png_ptr,
02163 png_infop info_ptr));
02164 
02165 #if defined(PNG_INFO_IMAGE_SUPPORTED)
02166 /* Returns row_pointers, which is an array of pointers to scanlines that was
02167 returned from png_read_png(). */
02168 extern PNG_EXPORT(png_bytepp,png_get_rows) PNGARG((png_structp png_ptr,
02169 png_infop info_ptr));
02170 /* Set row_pointers, which is an array of pointers to scanlines for use
02171 by png_write_png(). */
02172 extern PNG_EXPORT(void,png_set_rows) PNGARG((png_structp png_ptr,
02173    png_infop info_ptr, png_bytepp row_pointers));
02174 #endif
02175 
02176 /* Returns number of color channels in image. */
02177 extern PNG_EXPORT(png_byte,png_get_channels) PNGARG((png_structp png_ptr,
02178 png_infop info_ptr));
02179 
02180 #ifdef PNG_EASY_ACCESS_SUPPORTED
02181 /* Returns image width in pixels. */
02182 extern PNG_EXPORT(png_uint_32, png_get_image_width) PNGARG((png_structp
02183 png_ptr, png_infop info_ptr));
02184 
02185 /* Returns image height in pixels. */
02186 extern PNG_EXPORT(png_uint_32, png_get_image_height) PNGARG((png_structp
02187 png_ptr, png_infop info_ptr));
02188 
02189 /* Returns image bit_depth. */
02190 extern PNG_EXPORT(png_byte, png_get_bit_depth) PNGARG((png_structp
02191 png_ptr, png_infop info_ptr));
02192 
02193 /* Returns image color_type. */
02194 extern PNG_EXPORT(png_byte, png_get_color_type) PNGARG((png_structp
02195 png_ptr, png_infop info_ptr));
02196 
02197 /* Returns image filter_type. */
02198 extern PNG_EXPORT(png_byte, png_get_filter_type) PNGARG((png_structp
02199 png_ptr, png_infop info_ptr));
02200 
02201 /* Returns image interlace_type. */
02202 extern PNG_EXPORT(png_byte, png_get_interlace_type) PNGARG((png_structp
02203 png_ptr, png_infop info_ptr));
02204 
02205 /* Returns image compression_type. */
02206 extern PNG_EXPORT(png_byte, png_get_compression_type) PNGARG((png_structp
02207 png_ptr, png_infop info_ptr));
02208 
02209 /* Returns image resolution in pixels per meter, from pHYs chunk data. */
02210 extern PNG_EXPORT(png_uint_32, png_get_pixels_per_meter) PNGARG((png_structp
02211 png_ptr, png_infop info_ptr));
02212 extern PNG_EXPORT(png_uint_32, png_get_x_pixels_per_meter) PNGARG((png_structp
02213 png_ptr, png_infop info_ptr));
02214 extern PNG_EXPORT(png_uint_32, png_get_y_pixels_per_meter) PNGARG((png_structp
02215 png_ptr, png_infop info_ptr));
02216 
02217 /* Returns pixel aspect ratio, computed from pHYs chunk data.  */
02218 #ifdef PNG_FLOATING_POINT_SUPPORTED
02219 extern PNG_EXPORT(float, png_get_pixel_aspect_ratio) PNGARG((png_structp
02220 png_ptr, png_infop info_ptr));
02221 #endif
02222 
02223 /* Returns image x, y offset in pixels or microns, from oFFs chunk data. */
02224 extern PNG_EXPORT(png_int_32, png_get_x_offset_pixels) PNGARG((png_structp
02225 png_ptr, png_infop info_ptr));
02226 extern PNG_EXPORT(png_int_32, png_get_y_offset_pixels) PNGARG((png_structp
02227 png_ptr, png_infop info_ptr));
02228 extern PNG_EXPORT(png_int_32, png_get_x_offset_microns) PNGARG((png_structp
02229 png_ptr, png_infop info_ptr));
02230 extern PNG_EXPORT(png_int_32, png_get_y_offset_microns) PNGARG((png_structp
02231 png_ptr, png_infop info_ptr));
02232 
02233 #endif /* PNG_EASY_ACCESS_SUPPORTED */
02234 
02235 /* Returns pointer to signature string read from PNG header */
02236 extern PNG_EXPORT(png_bytep,png_get_signature) PNGARG((png_structp png_ptr,
02237 png_infop info_ptr));
02238 
02239 #if defined(PNG_bKGD_SUPPORTED)
02240 extern PNG_EXPORT(png_uint_32,png_get_bKGD) PNGARG((png_structp png_ptr,
02241    png_infop info_ptr, png_color_16p *background));
02242 #endif
02243 
02244 #if defined(PNG_bKGD_SUPPORTED)
02245 extern PNG_EXPORT(void,png_set_bKGD) PNGARG((png_structp png_ptr,
02246    png_infop info_ptr, png_color_16p background));
02247 #endif
02248 
02249 #if defined(PNG_cHRM_SUPPORTED)
02250 #ifdef PNG_FLOATING_POINT_SUPPORTED
02251 extern PNG_EXPORT(png_uint_32,png_get_cHRM) PNGARG((png_structp png_ptr,
02252    png_infop info_ptr, double *white_x, double *white_y, double *red_x,
02253    double *red_y, double *green_x, double *green_y, double *blue_x,
02254    double *blue_y));
02255 #endif
02256 #ifdef PNG_FIXED_POINT_SUPPORTED
02257 extern PNG_EXPORT(png_uint_32,png_get_cHRM_fixed) PNGARG((png_structp png_ptr,
02258    png_infop info_ptr, png_fixed_point *int_white_x, png_fixed_point
02259    *int_white_y, png_fixed_point *int_red_x, png_fixed_point *int_red_y,
02260    png_fixed_point *int_green_x, png_fixed_point *int_green_y, png_fixed_point
02261    *int_blue_x, png_fixed_point *int_blue_y));
02262 #endif
02263 #endif
02264 
02265 #if defined(PNG_cHRM_SUPPORTED)
02266 #ifdef PNG_FLOATING_POINT_SUPPORTED
02267 extern PNG_EXPORT(void,png_set_cHRM) PNGARG((png_structp png_ptr,
02268    png_infop info_ptr, double white_x, double white_y, double red_x,
02269    double red_y, double green_x, double green_y, double blue_x, double blue_y));
02270 #endif
02271 #ifdef PNG_FIXED_POINT_SUPPORTED
02272 extern PNG_EXPORT(void,png_set_cHRM_fixed) PNGARG((png_structp png_ptr,
02273    png_infop info_ptr, png_fixed_point int_white_x, png_fixed_point int_white_y,
02274    png_fixed_point int_red_x, png_fixed_point int_red_y, png_fixed_point
02275    int_green_x, png_fixed_point int_green_y, png_fixed_point int_blue_x,
02276    png_fixed_point int_blue_y));
02277 #endif
02278 #endif
02279 
02280 #if defined(PNG_gAMA_SUPPORTED)
02281 #ifdef PNG_FLOATING_POINT_SUPPORTED
02282 extern PNG_EXPORT(png_uint_32,png_get_gAMA) PNGARG((png_structp png_ptr,
02283    png_infop info_ptr, double *file_gamma));
02284 #endif
02285 extern PNG_EXPORT(png_uint_32,png_get_gAMA_fixed) PNGARG((png_structp png_ptr,
02286    png_infop info_ptr, png_fixed_point *int_file_gamma));
02287 #endif
02288 
02289 #if defined(PNG_gAMA_SUPPORTED)
02290 #ifdef PNG_FLOATING_POINT_SUPPORTED
02291 extern PNG_EXPORT(void,png_set_gAMA) PNGARG((png_structp png_ptr,
02292    png_infop info_ptr, double file_gamma));
02293 #endif
02294 extern PNG_EXPORT(void,png_set_gAMA_fixed) PNGARG((png_structp png_ptr,
02295    png_infop info_ptr, png_fixed_point int_file_gamma));
02296 #endif
02297 
02298 #if defined(PNG_hIST_SUPPORTED)
02299 extern PNG_EXPORT(png_uint_32,png_get_hIST) PNGARG((png_structp png_ptr,
02300    png_infop info_ptr, png_uint_16p *hist));
02301 #endif
02302 
02303 #if defined(PNG_hIST_SUPPORTED)
02304 extern PNG_EXPORT(void,png_set_hIST) PNGARG((png_structp png_ptr,
02305    png_infop info_ptr, png_uint_16p hist));
02306 #endif
02307 
02308 extern PNG_EXPORT(png_uint_32,png_get_IHDR) PNGARG((png_structp png_ptr,
02309    png_infop info_ptr, png_uint_32 *width, png_uint_32 *height,
02310    int *bit_depth, int *color_type, int *interlace_method,
02311    int *compression_method, int *filter_method));
02312 
02313 extern PNG_EXPORT(void,png_set_IHDR) PNGARG((png_structp png_ptr,
02314    png_infop info_ptr, png_uint_32 width, png_uint_32 height, int bit_depth,
02315    int color_type, int interlace_method, int compression_method,
02316    int filter_method));
02317 
02318 #if defined(PNG_oFFs_SUPPORTED)
02319 extern PNG_EXPORT(png_uint_32,png_get_oFFs) PNGARG((png_structp png_ptr,
02320    png_infop info_ptr, png_int_32 *offset_x, png_int_32 *offset_y,
02321    int *unit_type));
02322 #endif
02323 
02324 #if defined(PNG_oFFs_SUPPORTED)
02325 extern PNG_EXPORT(void,png_set_oFFs) PNGARG((png_structp png_ptr,
02326    png_infop info_ptr, png_int_32 offset_x, png_int_32 offset_y,
02327    int unit_type));
02328 #endif
02329 
02330 #if defined(PNG_pCAL_SUPPORTED)
02331 extern PNG_EXPORT(png_uint_32,png_get_pCAL) PNGARG((png_structp png_ptr,
02332    png_infop info_ptr, png_charp *purpose, png_int_32 *X0, png_int_32 *X1,
02333    int *type, int *nparams, png_charp *units, png_charpp *params));
02334 #endif
02335 
02336 #if defined(PNG_pCAL_SUPPORTED)
02337 extern PNG_EXPORT(void,png_set_pCAL) PNGARG((png_structp png_ptr,
02338    png_infop info_ptr, png_charp purpose, png_int_32 X0, png_int_32 X1,
02339    int type, int nparams, png_charp units, png_charpp params));
02340 #endif
02341 
02342 #if defined(PNG_pHYs_SUPPORTED)
02343 extern PNG_EXPORT(png_uint_32,png_get_pHYs) PNGARG((png_structp png_ptr,
02344    png_infop info_ptr, png_uint_32 *res_x, png_uint_32 *res_y, int *unit_type));
02345 #endif
02346 
02347 #if defined(PNG_pHYs_SUPPORTED)
02348 extern PNG_EXPORT(void,png_set_pHYs) PNGARG((png_structp png_ptr,
02349    png_infop info_ptr, png_uint_32 res_x, png_uint_32 res_y, int unit_type));
02350 #endif
02351 
02352 extern PNG_EXPORT(png_uint_32,png_get_PLTE) PNGARG((png_structp png_ptr,
02353    png_infop info_ptr, png_colorp *palette, int *num_palette));
02354 
02355 extern PNG_EXPORT(void,png_set_PLTE) PNGARG((png_structp png_ptr,
02356    png_infop info_ptr, png_colorp palette, int num_palette));
02357 
02358 #if defined(PNG_sBIT_SUPPORTED)
02359 extern PNG_EXPORT(png_uint_32,png_get_sBIT) PNGARG((png_structp png_ptr,
02360    png_infop info_ptr, png_color_8p *sig_bit));
02361 #endif
02362 
02363 #if defined(PNG_sBIT_SUPPORTED)
02364 extern PNG_EXPORT(void,png_set_sBIT) PNGARG((png_structp png_ptr,
02365    png_infop info_ptr, png_color_8p sig_bit));
02366 #endif
02367 
02368 #if defined(PNG_sRGB_SUPPORTED)
02369 extern PNG_EXPORT(png_uint_32,png_get_sRGB) PNGARG((png_structp png_ptr,
02370    png_infop info_ptr, int *intent));
02371 #endif
02372 
02373 #if defined(PNG_sRGB_SUPPORTED)
02374 extern PNG_EXPORT(void,png_set_sRGB) PNGARG((png_structp png_ptr,
02375    png_infop info_ptr, int intent));
02376 extern PNG_EXPORT(void,png_set_sRGB_gAMA_and_cHRM) PNGARG((png_structp png_ptr,
02377    png_infop info_ptr, int intent));
02378 #endif
02379 
02380 #if defined(PNG_iCCP_SUPPORTED)
02381 extern PNG_EXPORT(png_uint_32,png_get_iCCP) PNGARG((png_structp png_ptr,
02382    png_infop info_ptr, png_charpp name, int *compression_type,
02383    png_charpp profile, png_uint_32 *proflen));
02384    /* Note to maintainer: profile should be png_bytepp */
02385 #endif
02386 
02387 #if defined(PNG_iCCP_SUPPORTED)
02388 extern PNG_EXPORT(void,png_set_iCCP) PNGARG((png_structp png_ptr,
02389    png_infop info_ptr, png_charp name, int compression_type,
02390    png_charp profile, png_uint_32 proflen));
02391    /* Note to maintainer: profile should be png_bytep */
02392 #endif
02393 
02394 #if defined(PNG_sPLT_SUPPORTED)
02395 extern PNG_EXPORT(png_uint_32,png_get_sPLT) PNGARG((png_structp png_ptr,
02396    png_infop info_ptr, png_sPLT_tpp entries));
02397 #endif
02398 
02399 #if defined(PNG_sPLT_SUPPORTED)
02400 extern PNG_EXPORT(void,png_set_sPLT) PNGARG((png_structp png_ptr,
02401    png_infop info_ptr, png_sPLT_tp entries, int nentries));
02402 #endif
02403 
02404 #if defined(PNG_TEXT_SUPPORTED)
02405 /* png_get_text also returns the number of text chunks in *num_text */
02406 extern PNG_EXPORT(png_uint_32,png_get_text) PNGARG((png_structp png_ptr,
02407    png_infop info_ptr, png_textp *text_ptr, int *num_text));
02408 #endif
02409 
02410 /*
02411  *  Note while png_set_text() will accept a structure whose text,
02412  *  language, and  translated keywords are NULL pointers, the structure
02413  *  returned by png_get_text will always contain regular
02414  *  zero-terminated C strings.  They might be empty strings but
02415  *  they will never be NULL pointers.
02416  */
02417 
02418 #if defined(PNG_TEXT_SUPPORTED)
02419 extern PNG_EXPORT(void,png_set_text) PNGARG((png_structp png_ptr,
02420    png_infop info_ptr, png_textp text_ptr, int num_text));
02421 #endif
02422 
02423 #if defined(PNG_tIME_SUPPORTED)
02424 extern PNG_EXPORT(png_uint_32,png_get_tIME) PNGARG((png_structp png_ptr,
02425    png_infop info_ptr, png_timep *mod_time));
02426 #endif
02427 
02428 #if defined(PNG_tIME_SUPPORTED)
02429 extern PNG_EXPORT(void,png_set_tIME) PNGARG((png_structp png_ptr,
02430    png_infop info_ptr, png_timep mod_time));
02431 #endif
02432 
02433 #if defined(PNG_tRNS_SUPPORTED)
02434 extern PNG_EXPORT(png_uint_32,png_get_tRNS) PNGARG((png_structp png_ptr,
02435    png_infop info_ptr, png_bytep *trans, int *num_trans,
02436    png_color_16p *trans_values));
02437 #endif
02438 
02439 #if defined(PNG_tRNS_SUPPORTED)
02440 extern PNG_EXPORT(void,png_set_tRNS) PNGARG((png_structp png_ptr,
02441    png_infop info_ptr, png_bytep trans, int num_trans,
02442    png_color_16p trans_values));
02443 #endif
02444 
02445 #if defined(PNG_tRNS_SUPPORTED)
02446 #endif
02447 
02448 #if defined(PNG_sCAL_SUPPORTED)
02449 #ifdef PNG_FLOATING_POINT_SUPPORTED
02450 extern PNG_EXPORT(png_uint_32,png_get_sCAL) PNGARG((png_structp png_ptr,
02451    png_infop info_ptr, int *unit, double *width, double *height));
02452 #else
02453 #ifdef PNG_FIXED_POINT_SUPPORTED
02454 extern PNG_EXPORT(png_uint_32,png_get_sCAL_s) PNGARG((png_structp png_ptr,
02455    png_infop info_ptr, int *unit, png_charpp swidth, png_charpp sheight));
02456 #endif
02457 #endif
02458 #endif /* PNG_sCAL_SUPPORTED */
02459 
02460 #if defined(PNG_sCAL_SUPPORTED)
02461 #ifdef PNG_FLOATING_POINT_SUPPORTED
02462 extern PNG_EXPORT(void,png_set_sCAL) PNGARG((png_structp png_ptr,
02463    png_infop info_ptr, int unit, double width, double height));
02464 #else
02465 #ifdef PNG_FIXED_POINT_SUPPORTED
02466 extern PNG_EXPORT(void,png_set_sCAL_s) PNGARG((png_structp png_ptr,
02467    png_infop info_ptr, int unit, png_charp swidth, png_charp sheight));
02468 #endif
02469 #endif
02470 #endif /* PNG_sCAL_SUPPORTED || PNG_WRITE_sCAL_SUPPORTED */
02471 
02472 #if defined(PNG_UNKNOWN_CHUNKS_SUPPORTED)
02473 /* provide a list of chunks and how they are to be handled, if the built-in
02474    handling or default unknown chunk handling is not desired.  Any chunks not
02475    listed will be handled in the default manner.  The IHDR and IEND chunks
02476    must not be listed.
02477       keep = 0: follow default behaviour
02478            = 1: do not keep
02479            = 2: keep only if safe-to-copy
02480            = 3: keep even if unsafe-to-copy
02481 */
02482 extern PNG_EXPORT(void, png_set_keep_unknown_chunks) PNGARG((png_structp
02483    png_ptr, int keep, png_bytep chunk_list, int num_chunks));
02484 extern PNG_EXPORT(void, png_set_unknown_chunks) PNGARG((png_structp png_ptr,
02485    png_infop info_ptr, png_unknown_chunkp unknowns, int num_unknowns));
02486 extern PNG_EXPORT(void, png_set_unknown_chunk_location)
02487    PNGARG((png_structp png_ptr, png_infop info_ptr, int chunk, int location));
02488 extern PNG_EXPORT(png_uint_32,png_get_unknown_chunks) PNGARG((png_structp
02489    png_ptr, png_infop info_ptr, png_unknown_chunkpp entries));
02490 #endif
02491 #ifdef PNG_HANDLE_AS_UNKNOWN_SUPPORTED
02492 PNG_EXPORT(int,png_handle_as_unknown) PNGARG((png_structp png_ptr, png_bytep
02493    chunk_name));
02494 #endif
02495 
02496 /* Png_free_data() will turn off the "valid" flag for anything it frees.
02497    If you need to turn it off for a chunk that your application has freed,
02498    you can use png_set_invalid(png_ptr, info_ptr, PNG_INFO_CHNK); */
02499 extern PNG_EXPORT(void, png_set_invalid) PNGARG((png_structp png_ptr,
02500    png_infop info_ptr, int mask));
02501 
02502 #if defined(PNG_INFO_IMAGE_SUPPORTED)
02503 /* The "params" pointer is currently not used and is for future expansion. */
02504 extern PNG_EXPORT(void, png_read_png) PNGARG((png_structp png_ptr,
02505                         png_infop info_ptr,
02506                         int transforms,
02507                         png_voidp params));
02508 extern PNG_EXPORT(void, png_write_png) PNGARG((png_structp png_ptr,
02509                         png_infop info_ptr,
02510                         int transforms,
02511                         png_voidp params));
02512 #endif
02513 
02514 /* Define PNG_DEBUG at compile time for debugging information.  Higher
02515  * numbers for PNG_DEBUG mean more debugging information.  This has
02516  * only been added since version 0.95 so it is not implemented throughout
02517  * libpng yet, but more support will be added as needed.
02518  */
02519 #ifdef PNG_DEBUG
02520 #if (PNG_DEBUG > 0)
02521 #if !defined(PNG_DEBUG_FILE) && defined(_MSC_VER)
02522 #include <crtdbg.h>
02523 #if (PNG_DEBUG > 1)
02524 #define png_debug(l,m)  _RPT0(_CRT_WARN,m)
02525 #define png_debug1(l,m,p1)  _RPT1(_CRT_WARN,m,p1)
02526 #define png_debug2(l,m,p1,p2) _RPT2(_CRT_WARN,m,p1,p2)
02527 #endif
02528 #else /* PNG_DEBUG_FILE || !_MSC_VER */
02529 #ifndef PNG_DEBUG_FILE
02530 #define PNG_DEBUG_FILE stderr
02531 #endif /* PNG_DEBUG_FILE */
02532 #if (PNG_DEBUG > 1)
02533 #define png_debug(l,m) \
02534 { \
02535      int num_tabs=l; \
02536      fprintf(PNG_DEBUG_FILE,"%s"m,(num_tabs==1 ? "\t" : \
02537        (num_tabs==2 ? "\t\t":(num_tabs>2 ? "\t\t\t":"")))); \
02538 }
02539 #define png_debug1(l,m,p1) \
02540 { \
02541      int num_tabs=l; \
02542      fprintf(PNG_DEBUG_FILE,"%s"m,(num_tabs==1 ? "\t" : \
02543        (num_tabs==2 ? "\t\t":(num_tabs>2 ? "\t\t\t":""))),p1); \
02544 }
02545 #define png_debug2(l,m,p1,p2) \
02546 { \
02547      int num_tabs=l; \
02548      fprintf(PNG_DEBUG_FILE,"%s"m,(num_tabs==1 ? "\t" : \
02549        (num_tabs==2 ? "\t\t":(num_tabs>2 ? "\t\t\t":""))),p1,p2); \
02550 }
02551 #endif /* (PNG_DEBUG > 1) */
02552 #endif /* _MSC_VER */
02553 #endif /* (PNG_DEBUG > 0) */
02554 #endif /* PNG_DEBUG */
02555 #ifndef png_debug
02556 #define png_debug(l, m)
02557 #endif
02558 #ifndef png_debug1
02559 #define png_debug1(l, m, p1)
02560 #endif
02561 #ifndef png_debug2
02562 #define png_debug2(l, m, p1, p2)
02563 #endif
02564 
02565 extern PNG_EXPORT(png_charp,png_get_copyright) PNGARG((png_structp png_ptr));
02566 extern PNG_EXPORT(png_charp,png_get_header_ver) PNGARG((png_structp png_ptr));
02567 extern PNG_EXPORT(png_charp,png_get_header_version) PNGARG((png_structp png_ptr));
02568 extern PNG_EXPORT(png_charp,png_get_libpng_ver) PNGARG((png_structp png_ptr));
02569 
02570 #ifdef PNG_MNG_FEATURES_SUPPORTED
02571 extern PNG_EXPORT(png_uint_32,png_permit_mng_features) PNGARG((png_structp
02572    png_ptr, png_uint_32 mng_features_permitted));
02573 #endif
02574 
02575 /* For use in png_set_keep_unknown, added to version 1.2.6 */
02576 #define PNG_HANDLE_CHUNK_AS_DEFAULT   0
02577 #define PNG_HANDLE_CHUNK_NEVER        1
02578 #define PNG_HANDLE_CHUNK_IF_SAFE      2
02579 #define PNG_HANDLE_CHUNK_ALWAYS       3
02580 
02581 /* Added to version 1.2.0 */
02582 #if defined(PNG_ASSEMBLER_CODE_SUPPORTED)
02583 #if defined(PNG_MMX_CODE_SUPPORTED)
02584 #define PNG_ASM_FLAG_MMX_SUPPORT_COMPILED  0x01  /* not user-settable */
02585 #define PNG_ASM_FLAG_MMX_SUPPORT_IN_CPU    0x02  /* not user-settable */
02586 #define PNG_ASM_FLAG_MMX_READ_COMBINE_ROW  0x04
02587 #define PNG_ASM_FLAG_MMX_READ_INTERLACE    0x08
02588 #define PNG_ASM_FLAG_MMX_READ_FILTER_SUB   0x10
02589 #define PNG_ASM_FLAG_MMX_READ_FILTER_UP    0x20
02590 #define PNG_ASM_FLAG_MMX_READ_FILTER_AVG   0x40
02591 #define PNG_ASM_FLAG_MMX_READ_FILTER_PAETH 0x80
02592 #define PNG_ASM_FLAGS_INITIALIZED          0x80000000  /* not user-settable */
02593 
02594 #define PNG_MMX_READ_FLAGS ( PNG_ASM_FLAG_MMX_READ_COMBINE_ROW  \
02595                            | PNG_ASM_FLAG_MMX_READ_INTERLACE    \
02596                            | PNG_ASM_FLAG_MMX_READ_FILTER_SUB   \
02597                            | PNG_ASM_FLAG_MMX_READ_FILTER_UP    \
02598                            | PNG_ASM_FLAG_MMX_READ_FILTER_AVG   \
02599                            | PNG_ASM_FLAG_MMX_READ_FILTER_PAETH )
02600 #define PNG_MMX_WRITE_FLAGS ( 0 )
02601 
02602 #define PNG_MMX_FLAGS ( PNG_ASM_FLAG_MMX_SUPPORT_COMPILED \
02603                       | PNG_ASM_FLAG_MMX_SUPPORT_IN_CPU   \
02604                       | PNG_MMX_READ_FLAGS                \
02605                       | PNG_MMX_WRITE_FLAGS )
02606 
02607 #define PNG_SELECT_READ   1
02608 #define PNG_SELECT_WRITE  2
02609 #endif /* PNG_MMX_CODE_SUPPORTED */
02610 
02611 #if !defined(PNG_1_0_X)
02612 /* pngget.c */
02613 extern PNG_EXPORT(png_uint_32,png_get_mmx_flagmask)
02614    PNGARG((int flag_select, int *compilerID));
02615 
02616 /* pngget.c */
02617 extern PNG_EXPORT(png_uint_32,png_get_asm_flagmask)
02618    PNGARG((int flag_select));
02619 
02620 /* pngget.c */
02621 extern PNG_EXPORT(png_uint_32,png_get_asm_flags)
02622    PNGARG((png_structp png_ptr));
02623 
02624 /* pngget.c */
02625 extern PNG_EXPORT(png_byte,png_get_mmx_bitdepth_threshold)
02626    PNGARG((png_structp png_ptr));
02627 
02628 /* pngget.c */
02629 extern PNG_EXPORT(png_uint_32,png_get_mmx_rowbytes_threshold)
02630    PNGARG((png_structp png_ptr));
02631 
02632 /* pngset.c */
02633 extern PNG_EXPORT(void,png_set_asm_flags)
02634    PNGARG((png_structp png_ptr, png_uint_32 asm_flags));
02635 
02636 /* pngset.c */
02637 extern PNG_EXPORT(void,png_set_mmx_thresholds)
02638    PNGARG((png_structp png_ptr, png_byte mmx_bitdepth_threshold,
02639    png_uint_32 mmx_rowbytes_threshold));
02640 
02641 #endif /* PNG_1_0_X */
02642 
02643 #if !defined(PNG_1_0_X)
02644 /* png.c, pnggccrd.c, or pngvcrd.c */
02645 extern PNG_EXPORT(int,png_mmx_support) PNGARG((void));
02646 #endif /* PNG_ASSEMBLER_CODE_SUPPORTED */
02647 
02648 /* Strip the prepended error numbers ("#nnn ") from error and warning
02649  * messages before passing them to the error or warning handler. */
02650 #ifdef PNG_ERROR_NUMBERS_SUPPORTED
02651 extern PNG_EXPORT(void,png_set_strip_error_numbers) PNGARG((png_structp
02652    png_ptr, png_uint_32 strip_mode));
02653 #endif
02654 
02655 #endif /* PNG_1_0_X */
02656 
02657 /* Added at libpng-1.2.6 */
02658 #ifdef PNG_SET_USER_LIMITS_SUPPORTED
02659 extern PNG_EXPORT(void,png_set_user_limits) PNGARG((png_structp
02660    png_ptr, png_uint_32 user_width_max, png_uint_32 user_height_max));
02661 extern PNG_EXPORT(png_uint_32,png_get_user_width_max) PNGARG((png_structp
02662    png_ptr));
02663 extern PNG_EXPORT(png_uint_32,png_get_user_height_max) PNGARG((png_structp
02664    png_ptr));
02665 #endif
02666 
02667 
02668 /* Maintainer: Put new public prototypes here ^, in libpng.3, and project defs */
02669 
02670 #ifdef PNG_READ_COMPOSITE_NODIV_SUPPORTED
02671 /* With these routines we avoid an integer divide, which will be slower on
02672  * most machines.  However, it does take more operations than the corresponding
02673  * divide method, so it may be slower on a few RISC systems.  There are two
02674  * shifts (by 8 or 16 bits) and an addition, versus a single integer divide.
02675  *
02676  * Note that the rounding factors are NOT supposed to be the same!  128 and
02677  * 32768 are correct for the NODIV code; 127 and 32767 are correct for the
02678  * standard method.
02679  *
02680  * [Optimized code by Greg Roelofs and Mark Adler...blame us for bugs. :-) ]
02681  */
02682 
02683  /* fg and bg should be in `gamma 1.0' space; alpha is the opacity          */
02684 
02685 #  define png_composite(composite, fg, alpha, bg)                            \
02686      { png_uint_16 temp = (png_uint_16)((png_uint_16)(fg) * (png_uint_16)(alpha) \
02687                         +        (png_uint_16)(bg)*(png_uint_16)(255 -       \
02688                         (png_uint_16)(alpha)) + (png_uint_16)128);           \
02689        (composite) = (png_byte)((temp + (temp >> 8)) >> 8); }
02690 
02691 #  define png_composite_16(composite, fg, alpha, bg)                         \
02692      { png_uint_32 temp = (png_uint_32)((png_uint_32)(fg) * (png_uint_32)(alpha) \
02693                         + (png_uint_32)(bg)*(png_uint_32)(65535L -           \
02694                         (png_uint_32)(alpha)) + (png_uint_32)32768L);        \
02695        (composite) = (png_uint_16)((temp + (temp >> 16)) >> 16); }
02696 
02697 #else  /* standard method using integer division */
02698 
02699 #  define png_composite(composite, fg, alpha, bg)                            \
02700      (composite) = (png_byte)(((png_uint_16)(fg) * (png_uint_16)(alpha) +    \
02701        (png_uint_16)(bg) * (png_uint_16)(255 - (png_uint_16)(alpha)) +       \
02702        (png_uint_16)127) / 255)
02703 
02704 #  define png_composite_16(composite, fg, alpha, bg)                         \
02705      (composite) = (png_uint_16)(((png_uint_32)(fg) * (png_uint_32)(alpha) + \
02706        (png_uint_32)(bg)*(png_uint_32)(65535L - (png_uint_32)(alpha)) +      \
02707        (png_uint_32)32767) / (png_uint_32)65535L)
02708 
02709 #endif /* PNG_READ_COMPOSITE_NODIV_SUPPORTED */
02710 
02711 /* Inline macros to do direct reads of bytes from the input buffer.  These
02712  * require that you are using an architecture that uses PNG byte ordering
02713  * (MSB first) and supports unaligned data storage.  I think that PowerPC
02714  * in big-endian mode and 680x0 are the only ones that will support this.
02715  * The x86 line of processors definitely do not.  The png_get_int_32()
02716  * routine also assumes we are using two's complement format for negative
02717  * values, which is almost certainly true.
02718  */
02719 #if defined(PNG_READ_BIG_ENDIAN_SUPPORTED)
02720 #  define png_get_uint_32(buf) ( *((png_uint_32p) (buf)))
02721 #  define png_get_uint_16(buf) ( *((png_uint_16p) (buf)))
02722 #  define png_get_int_32(buf)  ( *((png_int_32p)  (buf)))
02723 #else
02724 extern PNG_EXPORT(png_uint_32,png_get_uint_32) PNGARG((png_bytep buf));
02725 extern PNG_EXPORT(png_uint_16,png_get_uint_16) PNGARG((png_bytep buf));
02726 extern PNG_EXPORT(png_int_32,png_get_int_32) PNGARG((png_bytep buf));
02727 #endif /* !PNG_READ_BIG_ENDIAN_SUPPORTED */
02728 extern PNG_EXPORT(png_uint_32,png_get_uint_31)
02729   PNGARG((png_structp png_ptr, png_bytep buf));
02730 /* No png_get_int_16 -- may be added if there's a real need for it. */
02731 
02732 /* Place a 32-bit number into a buffer in PNG byte order (big-endian).
02733  */
02734 extern PNG_EXPORT(void,png_save_uint_32)
02735    PNGARG((png_bytep buf, png_uint_32 i));
02736 extern PNG_EXPORT(void,png_save_int_32)
02737    PNGARG((png_bytep buf, png_int_32 i));
02738 
02739 /* Place a 16-bit number into a buffer in PNG byte order.
02740  * The parameter is declared unsigned int, not png_uint_16,
02741  * just to avoid potential problems on pre-ANSI C compilers.
02742  */
02743 extern PNG_EXPORT(void,png_save_uint_16)
02744    PNGARG((png_bytep buf, unsigned int i));
02745 /* No png_save_int_16 -- may be added if there's a real need for it. */
02746 
02747 /* ************************************************************************* */
02748 
02749 /* These next functions are used internally in the code.  They generally
02750  * shouldn't be used unless you are writing code to add or replace some
02751  * functionality in libpng.  More information about most functions can
02752  * be found in the files where the functions are located.
02753  */
02754 
02755 
02756 /* Various modes of operation, that are visible to applications because
02757  * they are used for unknown chunk location.
02758  */
02759 #define PNG_HAVE_IHDR               0x01
02760 #define PNG_HAVE_PLTE               0x02
02761 #define PNG_HAVE_IDAT               0x04
02762 #define PNG_AFTER_IDAT              0x08 /* Have complete zlib datastream */
02763 #define PNG_HAVE_IEND               0x10
02764 
02765 #if defined(PNG_INTERNAL)
02766 
02767 /* More modes of operation.  Note that after an init, mode is set to
02768  * zero automatically when the structure is created.
02769  */
02770 #define PNG_HAVE_gAMA               0x20
02771 #define PNG_HAVE_cHRM               0x40
02772 #define PNG_HAVE_sRGB               0x80
02773 #define PNG_HAVE_CHUNK_HEADER      0x100
02774 #define PNG_WROTE_tIME             0x200
02775 #define PNG_WROTE_INFO_BEFORE_PLTE 0x400
02776 #define PNG_BACKGROUND_IS_GRAY     0x800
02777 #define PNG_HAVE_PNG_SIGNATURE    0x1000
02778 #define PNG_HAVE_CHUNK_AFTER_IDAT 0x2000 /* Have another chunk after IDAT */
02779 
02780 /* flags for the transformations the PNG library does on the image data */
02781 #define PNG_BGR                0x0001
02782 #define PNG_INTERLACE          0x0002
02783 #define PNG_PACK               0x0004
02784 #define PNG_SHIFT              0x0008
02785 #define PNG_SWAP_BYTES         0x0010
02786 #define PNG_INVERT_MONO        0x0020
02787 #define PNG_DITHER             0x0040
02788 #define PNG_BACKGROUND         0x0080
02789 #define PNG_BACKGROUND_EXPAND  0x0100
02790                           /*   0x0200 unused */
02791 #define PNG_16_TO_8            0x0400
02792 #define PNG_RGBA               0x0800
02793 #define PNG_EXPAND             0x1000
02794 #define PNG_GAMMA              0x2000
02795 #define PNG_GRAY_TO_RGB        0x4000
02796 #define PNG_FILLER             0x8000L
02797 #define PNG_PACKSWAP          0x10000L
02798 #define PNG_SWAP_ALPHA        0x20000L
02799 #define PNG_STRIP_ALPHA       0x40000L
02800 #define PNG_INVERT_ALPHA      0x80000L
02801 #define PNG_USER_TRANSFORM   0x100000L
02802 #define PNG_RGB_TO_GRAY_ERR  0x200000L
02803 #define PNG_RGB_TO_GRAY_WARN 0x400000L
02804 #define PNG_RGB_TO_GRAY      0x600000L  /* two bits, RGB_TO_GRAY_ERR|WARN */
02805                        /*    0x800000L     Unused */
02806 #define PNG_ADD_ALPHA       0x1000000L  /* Added to libpng-1.2.7 */
02807 #define PNG_EXPAND_tRNS     0x2000000L  /* Added to libpng-1.2.9 */
02808                        /*   0x4000000L  unused */
02809                        /*   0x8000000L  unused */
02810                        /*  0x10000000L  unused */
02811                        /*  0x20000000L  unused */
02812                        /*  0x40000000L  unused */
02813 
02814 /* flags for png_create_struct */
02815 #define PNG_STRUCT_PNG   0x0001
02816 #define PNG_STRUCT_INFO  0x0002
02817 
02818 /* Scaling factor for filter heuristic weighting calculations */
02819 #define PNG_WEIGHT_SHIFT 8
02820 #define PNG_WEIGHT_FACTOR (1<<(PNG_WEIGHT_SHIFT))
02821 #define PNG_COST_SHIFT 3
02822 #define PNG_COST_FACTOR (1<<(PNG_COST_SHIFT))
02823 
02824 /* flags for the png_ptr->flags rather than declaring a byte for each one */
02825 #define PNG_FLAG_ZLIB_CUSTOM_STRATEGY     0x0001
02826 #define PNG_FLAG_ZLIB_CUSTOM_LEVEL        0x0002
02827 #define PNG_FLAG_ZLIB_CUSTOM_MEM_LEVEL    0x0004
02828 #define PNG_FLAG_ZLIB_CUSTOM_WINDOW_BITS  0x0008
02829 #define PNG_FLAG_ZLIB_CUSTOM_METHOD       0x0010
02830 #define PNG_FLAG_ZLIB_FINISHED            0x0020
02831 #define PNG_FLAG_ROW_INIT                 0x0040
02832 #define PNG_FLAG_FILLER_AFTER             0x0080
02833 #define PNG_FLAG_CRC_ANCILLARY_USE        0x0100
02834 #define PNG_FLAG_CRC_ANCILLARY_NOWARN     0x0200
02835 #define PNG_FLAG_CRC_CRITICAL_USE         0x0400
02836 #define PNG_FLAG_CRC_CRITICAL_IGNORE      0x0800
02837 #define PNG_FLAG_FREE_PLTE                0x1000
02838 #define PNG_FLAG_FREE_TRNS                0x2000
02839 #define PNG_FLAG_FREE_HIST                0x4000
02840 #define PNG_FLAG_KEEP_UNKNOWN_CHUNKS      0x8000L
02841 #define PNG_FLAG_KEEP_UNSAFE_CHUNKS       0x10000L
02842 #define PNG_FLAG_LIBRARY_MISMATCH         0x20000L
02843 #define PNG_FLAG_STRIP_ERROR_NUMBERS      0x40000L
02844 #define PNG_FLAG_STRIP_ERROR_TEXT         0x80000L
02845 #define PNG_FLAG_MALLOC_NULL_MEM_OK       0x100000L
02846 #define PNG_FLAG_ADD_ALPHA                0x200000L  /* Added to libpng-1.2.8 */
02847 #define PNG_FLAG_STRIP_ALPHA              0x400000L  /* Added to libpng-1.2.8 */
02848                                   /*      0x800000L  unused */
02849                                   /*     0x1000000L  unused */
02850                                   /*     0x2000000L  unused */
02851                                   /*     0x4000000L  unused */
02852                                   /*     0x8000000L  unused */
02853                                   /*    0x10000000L  unused */
02854                                   /*    0x20000000L  unused */
02855                                   /*    0x40000000L  unused */
02856 
02857 #define PNG_FLAG_CRC_ANCILLARY_MASK (PNG_FLAG_CRC_ANCILLARY_USE | \
02858                                      PNG_FLAG_CRC_ANCILLARY_NOWARN)
02859 
02860 #define PNG_FLAG_CRC_CRITICAL_MASK  (PNG_FLAG_CRC_CRITICAL_USE | \
02861                                      PNG_FLAG_CRC_CRITICAL_IGNORE)
02862 
02863 #define PNG_FLAG_CRC_MASK           (PNG_FLAG_CRC_ANCILLARY_MASK | \
02864                                      PNG_FLAG_CRC_CRITICAL_MASK)
02865 
02866 /* save typing and make code easier to understand */
02867 
02868 #define PNG_COLOR_DIST(c1, c2) (abs((int)((c1).red) - (int)((c2).red)) + \
02869    abs((int)((c1).green) - (int)((c2).green)) + \
02870    abs((int)((c1).blue) - (int)((c2).blue)))
02871 
02872 /* Added to libpng-1.2.6 JB */
02873 #define PNG_ROWBYTES(pixel_bits, width) \
02874     ((pixel_bits) >= 8 ? \
02875     ((width) * (((png_uint_32)(pixel_bits)) >> 3)) : \
02876     (( ((width) * ((png_uint_32)(pixel_bits))) + 7) >> 3) )
02877 
02878 /* PNG_OUT_OF_RANGE returns true if value is outside the range
02879    ideal-delta..ideal+delta.  Each argument is evaluated twice.
02880    "ideal" and "delta" should be constants, normally simple
02881    integers, "value" a variable. Added to libpng-1.2.6 JB */
02882 #define PNG_OUT_OF_RANGE(value, ideal, delta) \
02883         ( (value) < (ideal)-(delta) || (value) > (ideal)+(delta) )
02884 
02885 /* variables declared in png.c - only it needs to define PNG_NO_EXTERN */
02886 #if !defined(PNG_NO_EXTERN) || defined(PNG_ALWAYS_EXTERN)
02887 /* place to hold the signature string for a PNG file. */
02888 #ifdef PNG_USE_GLOBAL_ARRAYS
02889    PNG_EXPORT_VAR (PNG_CONST png_byte FARDATA) png_sig[8];
02890 #else
02891 #endif
02892 #endif /* PNG_NO_EXTERN */
02893 
02894 /* Constant strings for known chunk types.  If you need to add a chunk,
02895  * define the name here, and add an invocation of the macro in png.c and
02896  * wherever it's needed.
02897  */
02898 #define PNG_IHDR png_byte png_IHDR[5] = { 73,  72,  68,  82, '\0'}
02899 #define PNG_IDAT png_byte png_IDAT[5] = { 73,  68,  65,  84, '\0'}
02900 #define PNG_IEND png_byte png_IEND[5] = { 73,  69,  78,  68, '\0'}
02901 #define PNG_PLTE png_byte png_PLTE[5] = { 80,  76,  84,  69, '\0'}
02902 #define PNG_bKGD png_byte png_bKGD[5] = { 98,  75,  71,  68, '\0'}
02903 #define PNG_cHRM png_byte png_cHRM[5] = { 99,  72,  82,  77, '\0'}
02904 #define PNG_gAMA png_byte png_gAMA[5] = {103,  65,  77,  65, '\0'}
02905 #define PNG_hIST png_byte png_hIST[5] = {104,  73,  83,  84, '\0'}
02906 #define PNG_iCCP png_byte png_iCCP[5] = {105,  67,  67,  80, '\0'}
02907 #define PNG_iTXt png_byte png_iTXt[5] = {105,  84,  88, 116, '\0'}
02908 #define PNG_oFFs png_byte png_oFFs[5] = {111,  70,  70, 115, '\0'}
02909 #define PNG_pCAL png_byte png_pCAL[5] = {112,  67,  65,  76, '\0'}
02910 #define PNG_sCAL png_byte png_sCAL[5] = {115,  67,  65,  76, '\0'}
02911 #define PNG_pHYs png_byte png_pHYs[5] = {112,  72,  89, 115, '\0'}
02912 #define PNG_sBIT png_byte png_sBIT[5] = {115,  66,  73,  84, '\0'}
02913 #define PNG_sPLT png_byte png_sPLT[5] = {115,  80,  76,  84, '\0'}
02914 #define PNG_sRGB png_byte png_sRGB[5] = {115,  82,  71,  66, '\0'}
02915 #define PNG_tEXt png_byte png_tEXt[5] = {116,  69,  88, 116, '\0'}
02916 #define PNG_tIME png_byte png_tIME[5] = {116,  73,  77,  69, '\0'}
02917 #define PNG_tRNS png_byte png_tRNS[5] = {116,  82,  78,  83, '\0'}
02918 #define PNG_zTXt png_byte png_zTXt[5] = {122,  84,  88, 116, '\0'}
02919 
02920 #ifdef PNG_USE_GLOBAL_ARRAYS
02921 PNG_EXPORT_VAR (png_byte FARDATA) png_IHDR[5];
02922 PNG_EXPORT_VAR (png_byte FARDATA) png_IDAT[5];
02923 PNG_EXPORT_VAR (png_byte FARDATA) png_IEND[5];
02924 PNG_EXPORT_VAR (png_byte FARDATA) png_PLTE[5];
02925 PNG_EXPORT_VAR (png_byte FARDATA) png_bKGD[5];
02926 PNG_EXPORT_VAR (png_byte FARDATA) png_cHRM[5];
02927 PNG_EXPORT_VAR (png_byte FARDATA) png_gAMA[5];
02928 PNG_EXPORT_VAR (png_byte FARDATA) png_hIST[5];
02929 PNG_EXPORT_VAR (png_byte FARDATA) png_iCCP[5];
02930 PNG_EXPORT_VAR (png_byte FARDATA) png_iTXt[5];
02931 PNG_EXPORT_VAR (png_byte FARDATA) png_oFFs[5];
02932 PNG_EXPORT_VAR (png_byte FARDATA) png_pCAL[5];
02933 PNG_EXPORT_VAR (png_byte FARDATA) png_sCAL[5];
02934 PNG_EXPORT_VAR (png_byte FARDATA) png_pHYs[5];
02935 PNG_EXPORT_VAR (png_byte FARDATA) png_sBIT[5];
02936 PNG_EXPORT_VAR (png_byte FARDATA) png_sPLT[5];
02937 PNG_EXPORT_VAR (png_byte FARDATA) png_sRGB[5];
02938 PNG_EXPORT_VAR (png_byte FARDATA) png_tEXt[5];
02939 PNG_EXPORT_VAR (png_byte FARDATA) png_tIME[5];
02940 PNG_EXPORT_VAR (png_byte FARDATA) png_tRNS[5];
02941 PNG_EXPORT_VAR (png_byte FARDATA) png_zTXt[5];
02942 #endif /* PNG_USE_GLOBAL_ARRAYS */
02943 
02944 #if defined(PNG_1_0_X) || defined (PNG_1_2_X)
02945 /* Initialize png_ptr struct for reading, and allocate any other memory.
02946  * (old interface - DEPRECATED - use png_create_read_struct instead).
02947  */
02948 extern PNG_EXPORT(void,png_read_init) PNGARG((png_structp png_ptr));
02949 #undef png_read_init
02950 #define png_read_init(png_ptr) png_read_init_3(&png_ptr, \
02951     PNG_LIBPNG_VER_STRING,  png_sizeof(png_struct));
02952 #endif
02953 
02954 extern PNG_EXPORT(void,png_read_init_3) PNGARG((png_structpp ptr_ptr,
02955     png_const_charp user_png_ver, png_size_t png_struct_size));
02956 #if defined(PNG_1_0_X) || defined (PNG_1_2_X)
02957 extern PNG_EXPORT(void,png_read_init_2) PNGARG((png_structp png_ptr,
02958     png_const_charp user_png_ver, png_size_t png_struct_size, png_size_t
02959     png_info_size));
02960 #endif
02961 
02962 #if defined(PNG_1_0_X) || defined (PNG_1_2_X)
02963 /* Initialize png_ptr struct for writing, and allocate any other memory.
02964  * (old interface - DEPRECATED - use png_create_write_struct instead).
02965  */
02966 extern PNG_EXPORT(void,png_write_init) PNGARG((png_structp png_ptr));
02967 #undef png_write_init
02968 #define png_write_init(png_ptr) png_write_init_3(&png_ptr, \
02969     PNG_LIBPNG_VER_STRING, png_sizeof(png_struct));
02970 #endif
02971 
02972 extern PNG_EXPORT(void,png_write_init_3) PNGARG((png_structpp ptr_ptr,
02973     png_const_charp user_png_ver, png_size_t png_struct_size));
02974 extern PNG_EXPORT(void,png_write_init_2) PNGARG((png_structp png_ptr,
02975     png_const_charp user_png_ver, png_size_t png_struct_size, png_size_t
02976     png_info_size));
02977 
02978 /* Allocate memory for an internal libpng struct */
02979 PNG_EXTERN png_voidp png_create_struct PNGARG((int type));
02980 
02981 /* Free memory from internal libpng struct */
02982 PNG_EXTERN void png_destroy_struct PNGARG((png_voidp struct_ptr));
02983 
02984 PNG_EXTERN png_voidp png_create_struct_2 PNGARG((int type, png_malloc_ptr
02985   malloc_fn, png_voidp mem_ptr));
02986 PNG_EXTERN void png_destroy_struct_2 PNGARG((png_voidp struct_ptr,
02987    png_free_ptr free_fn, png_voidp mem_ptr));
02988 
02989 /* Free any memory that info_ptr points to and reset struct. */
02990 PNG_EXTERN void png_info_destroy PNGARG((png_structp png_ptr,
02991    png_infop info_ptr));
02992 
02993 #ifndef PNG_1_0_X
02994 /* Function to allocate memory for zlib. */
02995 PNG_EXTERN voidpf png_zalloc PNGARG((voidpf png_ptr, uInt items, uInt size));
02996 
02997 /* Function to free memory for zlib */
02998 PNG_EXTERN void png_zfree PNGARG((voidpf png_ptr, voidpf ptr));
02999 
03000 #ifdef PNG_SIZE_T
03001 /* Function to convert a sizeof an item to png_sizeof item */
03002    PNG_EXTERN png_size_t PNGAPI png_convert_size PNGARG((size_t size));
03003 #endif
03004 
03005 /* Next four functions are used internally as callbacks.  PNGAPI is required
03006  * but not PNG_EXPORT.  PNGAPI added at libpng version 1.2.3. */
03007 
03008 PNG_EXTERN void PNGAPI png_default_read_data PNGARG((png_structp png_ptr,
03009    png_bytep data, png_size_t length));
03010 
03011 #ifdef PNG_PROGRESSIVE_READ_SUPPORTED
03012 PNG_EXTERN void PNGAPI png_push_fill_buffer PNGARG((png_structp png_ptr,
03013    png_bytep buffer, png_size_t length));
03014 #endif
03015 
03016 PNG_EXTERN void PNGAPI png_default_write_data PNGARG((png_structp png_ptr,
03017    png_bytep data, png_size_t length));
03018 
03019 #if defined(PNG_WRITE_FLUSH_SUPPORTED)
03020 #if !defined(PNG_NO_STDIO)
03021 PNG_EXTERN void PNGAPI png_default_flush PNGARG((png_structp png_ptr));
03022 #endif
03023 #endif
03024 #else /* PNG_1_0_X */
03025 #ifdef PNG_PROGRESSIVE_READ_SUPPORTED
03026 PNG_EXTERN void png_push_fill_buffer PNGARG((png_structp png_ptr,
03027    png_bytep buffer, png_size_t length));
03028 #endif
03029 #endif /* PNG_1_0_X */
03030 
03031 /* Reset the CRC variable */
03032 PNG_EXTERN void png_reset_crc PNGARG((png_structp png_ptr));
03033 
03034 /* Write the "data" buffer to whatever output you are using. */
03035 PNG_EXTERN void png_write_data PNGARG((png_structp png_ptr, png_bytep data,
03036    png_size_t length));
03037 
03038 /* Read data from whatever input you are using into the "data" buffer */
03039 PNG_EXTERN void png_read_data PNGARG((png_structp png_ptr, png_bytep data,
03040    png_size_t length));
03041 
03042 /* Read bytes into buf, and update png_ptr->crc */
03043 PNG_EXTERN void png_crc_read PNGARG((png_structp png_ptr, png_bytep buf,
03044    png_size_t length));
03045 
03046 /* Decompress data in a chunk that uses compression */
03047 #if defined(PNG_zTXt_SUPPORTED) || defined(PNG_iTXt_SUPPORTED) || \
03048     defined(PNG_iCCP_SUPPORTED) || defined(PNG_sPLT_SUPPORTED)
03049 PNG_EXTERN void png_decompress_chunk PNGARG((png_structp png_ptr,
03050    int comp_type, png_size_t chunklength,
03051    png_size_t prefix_length, png_size_t *data_length));
03052 #endif
03053 
03054 /* Read "skip" bytes, read the file crc, and (optionally) verify png_ptr->crc */
03055 PNG_EXTERN int png_crc_finish PNGARG((png_structp png_ptr, png_uint_32 skip));
03056 
03057 /* Read the CRC from the file and compare it to the libpng calculated CRC */
03058 PNG_EXTERN int png_crc_error PNGARG((png_structp png_ptr));
03059 
03060 /* Calculate the CRC over a section of data.  Note that we are only
03061  * passing a maximum of 64K on systems that have this as a memory limit,
03062  * since this is the maximum buffer size we can specify.
03063  */
03064 PNG_EXTERN void png_calculate_crc PNGARG((png_structp png_ptr, png_bytep ptr,
03065    png_size_t length));
03066 
03067 #if defined(PNG_WRITE_FLUSH_SUPPORTED)
03068 PNG_EXTERN void png_flush PNGARG((png_structp png_ptr));
03069 #endif
03070 
03071 /* simple function to write the signature */
03072 PNG_EXTERN void png_write_sig PNGARG((png_structp png_ptr));
03073 
03074 /* write various chunks */
03075 
03076 /* Write the IHDR chunk, and update the png_struct with the necessary
03077  * information.
03078  */
03079 PNG_EXTERN void png_write_IHDR PNGARG((png_structp png_ptr, png_uint_32 width,
03080    png_uint_32 height,
03081    int bit_depth, int color_type, int compression_method, int filter_method,
03082    int interlace_method));
03083 
03084 PNG_EXTERN void png_write_PLTE PNGARG((png_structp png_ptr, png_colorp palette,
03085    png_uint_32 num_pal));
03086 
03087 PNG_EXTERN void png_write_IDAT PNGARG((png_structp png_ptr, png_bytep data,
03088    png_size_t length));
03089 
03090 PNG_EXTERN void png_write_IEND PNGARG((png_structp png_ptr));
03091 
03092 #if defined(PNG_WRITE_gAMA_SUPPORTED)
03093 #ifdef PNG_FLOATING_POINT_SUPPORTED
03094 PNG_EXTERN void png_write_gAMA PNGARG((png_structp png_ptr, double file_gamma));
03095 #endif
03096 #ifdef PNG_FIXED_POINT_SUPPORTED
03097 PNG_EXTERN void png_write_gAMA_fixed PNGARG((png_structp png_ptr, png_fixed_point
03098     file_gamma));
03099 #endif
03100 #endif
03101 
03102 #if defined(PNG_WRITE_sBIT_SUPPORTED)
03103 PNG_EXTERN void png_write_sBIT PNGARG((png_structp png_ptr, png_color_8p sbit,
03104    int color_type));
03105 #endif
03106 
03107 #if defined(PNG_WRITE_cHRM_SUPPORTED)
03108 #ifdef PNG_FLOATING_POINT_SUPPORTED
03109 PNG_EXTERN void png_write_cHRM PNGARG((png_structp png_ptr,
03110    double white_x, double white_y,
03111    double red_x, double red_y, double green_x, double green_y,
03112    double blue_x, double blue_y));
03113 #endif
03114 #ifdef PNG_FIXED_POINT_SUPPORTED
03115 PNG_EXTERN void png_write_cHRM_fixed PNGARG((png_structp png_ptr,
03116    png_fixed_point int_white_x, png_fixed_point int_white_y,
03117    png_fixed_point int_red_x, png_fixed_point int_red_y, png_fixed_point
03118    int_green_x, png_fixed_point int_green_y, png_fixed_point int_blue_x,
03119    png_fixed_point int_blue_y));
03120 #endif
03121 #endif
03122 
03123 #if defined(PNG_WRITE_sRGB_SUPPORTED)
03124 PNG_EXTERN void png_write_sRGB PNGARG((png_structp png_ptr,
03125    int intent));
03126 #endif
03127 
03128 #if defined(PNG_WRITE_iCCP_SUPPORTED)
03129 PNG_EXTERN void png_write_iCCP PNGARG((png_structp png_ptr,
03130    png_charp name, int compression_type,
03131    png_charp profile, int proflen));
03132    /* Note to maintainer: profile should be png_bytep */
03133 #endif
03134 
03135 #if defined(PNG_WRITE_sPLT_SUPPORTED)
03136 PNG_EXTERN void png_write_sPLT PNGARG((png_structp png_ptr,
03137    png_sPLT_tp palette));
03138 #endif
03139 
03140 #if defined(PNG_WRITE_tRNS_SUPPORTED)
03141 PNG_EXTERN void png_write_tRNS PNGARG((png_structp png_ptr, png_bytep trans,
03142    png_color_16p values, int number, int color_type));
03143 #endif
03144 
03145 #if defined(PNG_WRITE_bKGD_SUPPORTED)
03146 PNG_EXTERN void png_write_bKGD PNGARG((png_structp png_ptr,
03147    png_color_16p values, int color_type));
03148 #endif
03149 
03150 #if defined(PNG_WRITE_hIST_SUPPORTED)
03151 PNG_EXTERN void png_write_hIST PNGARG((png_structp png_ptr, png_uint_16p hist,
03152    int num_hist));
03153 #endif
03154 
03155 #if defined(PNG_WRITE_TEXT_SUPPORTED) || defined(PNG_WRITE_pCAL_SUPPORTED) || \
03156     defined(PNG_WRITE_iCCP_SUPPORTED) || defined(PNG_WRITE_sPLT_SUPPORTED)
03157 PNG_EXTERN png_size_t png_check_keyword PNGARG((png_structp png_ptr,
03158    png_charp key, png_charpp new_key));
03159 #endif
03160 
03161 #if defined(PNG_WRITE_tEXt_SUPPORTED)
03162 PNG_EXTERN void png_write_tEXt PNGARG((png_structp png_ptr, png_charp key,
03163    png_charp text, png_size_t text_len));
03164 #endif
03165 
03166 #if defined(PNG_WRITE_zTXt_SUPPORTED)
03167 PNG_EXTERN void png_write_zTXt PNGARG((png_structp png_ptr, png_charp key,
03168    png_charp text, png_size_t text_len, int compression));
03169 #endif
03170 
03171 #if defined(PNG_WRITE_iTXt_SUPPORTED)
03172 PNG_EXTERN void png_write_iTXt PNGARG((png_structp png_ptr,
03173    int compression, png_charp key, png_charp lang, png_charp lang_key,
03174    png_charp text));
03175 #endif
03176 
03177 #if defined(PNG_TEXT_SUPPORTED)  /* Added at version 1.0.14 and 1.2.4 */
03178 PNG_EXTERN int png_set_text_2 PNGARG((png_structp png_ptr,
03179    png_infop info_ptr, png_textp text_ptr, int num_text));
03180 #endif
03181 
03182 #if defined(PNG_WRITE_oFFs_SUPPORTED)
03183 PNG_EXTERN void png_write_oFFs PNGARG((png_structp png_ptr,
03184    png_int_32 x_offset, png_int_32 y_offset, int unit_type));
03185 #endif
03186 
03187 #if defined(PNG_WRITE_pCAL_SUPPORTED)
03188 PNG_EXTERN void png_write_pCAL PNGARG((png_structp png_ptr, png_charp purpose,
03189    png_int_32 X0, png_int_32 X1, int type, int nparams,
03190    png_charp units, png_charpp params));
03191 #endif
03192 
03193 #if defined(PNG_WRITE_pHYs_SUPPORTED)
03194 PNG_EXTERN void png_write_pHYs PNGARG((png_structp png_ptr,
03195    png_uint_32 x_pixels_per_unit, png_uint_32 y_pixels_per_unit,
03196    int unit_type));
03197 #endif
03198 
03199 #if defined(PNG_WRITE_tIME_SUPPORTED)
03200 PNG_EXTERN void png_write_tIME PNGARG((png_structp png_ptr,
03201    png_timep mod_time));
03202 #endif
03203 
03204 #if defined(PNG_WRITE_sCAL_SUPPORTED)
03205 #if defined(PNG_FLOATING_POINT_SUPPORTED) && !defined(PNG_NO_STDIO)
03206 PNG_EXTERN void png_write_sCAL PNGARG((png_structp png_ptr,
03207    int unit, double width, double height));
03208 #else
03209 #ifdef PNG_FIXED_POINT_SUPPORTED
03210 PNG_EXTERN void png_write_sCAL_s PNGARG((png_structp png_ptr,
03211    int unit, png_charp width, png_charp height));
03212 #endif
03213 #endif
03214 #endif
03215 
03216 /* Called when finished processing a row of data */
03217 PNG_EXTERN void png_write_finish_row PNGARG((png_structp png_ptr));
03218 
03219 /* Internal use only.   Called before first row of data */
03220 PNG_EXTERN void png_write_start_row PNGARG((png_structp png_ptr));
03221 
03222 #if defined(PNG_READ_GAMMA_SUPPORTED)
03223 PNG_EXTERN void png_build_gamma_table PNGARG((png_structp png_ptr));
03224 #endif
03225 
03226 /* combine a row of data, dealing with alpha, etc. if requested */
03227 PNG_EXTERN void png_combine_row PNGARG((png_structp png_ptr, png_bytep row,
03228    int mask));
03229 
03230 #if defined(PNG_READ_INTERLACING_SUPPORTED)
03231 /* expand an interlaced row */
03232 /* OLD pre-1.0.9 interface:
03233 PNG_EXTERN void png_do_read_interlace PNGARG((png_row_infop row_info,
03234    png_bytep row, int pass, png_uint_32 transformations));
03235  */
03236 PNG_EXTERN void png_do_read_interlace PNGARG((png_structp png_ptr));
03237 #endif
03238 
03239 /* GRR TO DO (2.0 or whenever):  simplify other internal calling interfaces */
03240 
03241 #if defined(PNG_WRITE_INTERLACING_SUPPORTED)
03242 /* grab pixels out of a row for an interlaced pass */
03243 PNG_EXTERN void png_do_write_interlace PNGARG((png_row_infop row_info,
03244    png_bytep row, int pass));
03245 #endif
03246 
03247 /* unfilter a row */
03248 PNG_EXTERN void png_read_filter_row PNGARG((png_structp png_ptr,
03249    png_row_infop row_info, png_bytep row, png_bytep prev_row, int filter));
03250 
03251 /* Choose the best filter to use and filter the row data */
03252 PNG_EXTERN void png_write_find_filter PNGARG((png_structp png_ptr,
03253    png_row_infop row_info));
03254 
03255 /* Write out the filtered row. */
03256 PNG_EXTERN void png_write_filtered_row PNGARG((png_structp png_ptr,
03257    png_bytep filtered_row));
03258 /* finish a row while reading, dealing with interlacing passes, etc. */
03259 PNG_EXTERN void png_read_finish_row PNGARG((png_structp png_ptr));
03260 
03261 /* initialize the row buffers, etc. */
03262 PNG_EXTERN void png_read_start_row PNGARG((png_structp png_ptr));
03263 /* optional call to update the users info structure */
03264 PNG_EXTERN void png_read_transform_info PNGARG((png_structp png_ptr,
03265    png_infop info_ptr));
03266 
03267 /* these are the functions that do the transformations */
03268 #if defined(PNG_READ_FILLER_SUPPORTED)
03269 PNG_EXTERN void png_do_read_filler PNGARG((png_row_infop row_info,
03270    png_bytep row, png_uint_32 filler, png_uint_32 flags));
03271 #endif
03272 
03273 #if defined(PNG_READ_SWAP_ALPHA_SUPPORTED)
03274 PNG_EXTERN void png_do_read_swap_alpha PNGARG((png_row_infop row_info,
03275    png_bytep row));
03276 #endif
03277 
03278 #if defined(PNG_WRITE_SWAP_ALPHA_SUPPORTED)
03279 PNG_EXTERN void png_do_write_swap_alpha PNGARG((png_row_infop row_info,
03280    png_bytep row));
03281 #endif
03282 
03283 #if defined(PNG_READ_INVERT_ALPHA_SUPPORTED)
03284 PNG_EXTERN void png_do_read_invert_alpha PNGARG((png_row_infop row_info,
03285    png_bytep row));
03286 #endif
03287 
03288 #if defined(PNG_WRITE_INVERT_ALPHA_SUPPORTED)
03289 PNG_EXTERN void png_do_write_invert_alpha PNGARG((png_row_infop row_info,
03290    png_bytep row));
03291 #endif
03292 
03293 #if defined(PNG_WRITE_FILLER_SUPPORTED) || \
03294     defined(PNG_READ_STRIP_ALPHA_SUPPORTED)
03295 PNG_EXTERN void png_do_strip_filler PNGARG((png_row_infop row_info,
03296    png_bytep row, png_uint_32 flags));
03297 #endif
03298 
03299 #if defined(PNG_READ_SWAP_SUPPORTED) || defined(PNG_WRITE_SWAP_SUPPORTED)
03300 PNG_EXTERN void png_do_swap PNGARG((png_row_infop row_info, png_bytep row));
03301 #endif
03302 
03303 #if defined(PNG_READ_PACKSWAP_SUPPORTED) || defined(PNG_WRITE_PACKSWAP_SUPPORTED)
03304 PNG_EXTERN void png_do_packswap PNGARG((png_row_infop row_info, png_bytep row));
03305 #endif
03306 
03307 #if defined(PNG_READ_RGB_TO_GRAY_SUPPORTED)
03308 PNG_EXTERN int png_do_rgb_to_gray PNGARG((png_structp png_ptr, png_row_infop
03309    row_info, png_bytep row));
03310 #endif
03311 
03312 #if defined(PNG_READ_GRAY_TO_RGB_SUPPORTED)
03313 PNG_EXTERN void png_do_gray_to_rgb PNGARG((png_row_infop row_info,
03314    png_bytep row));
03315 #endif
03316 
03317 #if defined(PNG_READ_PACK_SUPPORTED)
03318 PNG_EXTERN void png_do_unpack PNGARG((png_row_infop row_info, png_bytep row));
03319 #endif
03320 
03321 #if defined(PNG_READ_SHIFT_SUPPORTED)
03322 PNG_EXTERN void png_do_unshift PNGARG((png_row_infop row_info, png_bytep row,
03323    png_color_8p sig_bits));
03324 #endif
03325 
03326 #if defined(PNG_READ_INVERT_SUPPORTED) || defined(PNG_WRITE_INVERT_SUPPORTED)
03327 PNG_EXTERN void png_do_invert PNGARG((png_row_infop row_info, png_bytep row));
03328 #endif
03329 
03330 #if defined(PNG_READ_16_TO_8_SUPPORTED)
03331 PNG_EXTERN void png_do_chop PNGARG((png_row_infop row_info, png_bytep row));
03332 #endif
03333 
03334 #if defined(PNG_READ_DITHER_SUPPORTED)
03335 PNG_EXTERN void png_do_dither PNGARG((png_row_infop row_info,
03336    png_bytep row, png_bytep palette_lookup, png_bytep dither_lookup));
03337 
03338 #  if defined(PNG_CORRECT_PALETTE_SUPPORTED)
03339 PNG_EXTERN void png_correct_palette PNGARG((png_structp png_ptr,
03340    png_colorp palette, int num_palette));
03341 #  endif
03342 #endif
03343 
03344 #if defined(PNG_READ_BGR_SUPPORTED) || defined(PNG_WRITE_BGR_SUPPORTED)
03345 PNG_EXTERN void png_do_bgr PNGARG((png_row_infop row_info, png_bytep row));
03346 #endif
03347 
03348 #if defined(PNG_WRITE_PACK_SUPPORTED)
03349 PNG_EXTERN void png_do_pack PNGARG((png_row_infop row_info,
03350    png_bytep row, png_uint_32 bit_depth));
03351 #endif
03352 
03353 #if defined(PNG_WRITE_SHIFT_SUPPORTED)
03354 PNG_EXTERN void png_do_shift PNGARG((png_row_infop row_info, png_bytep row,
03355    png_color_8p bit_depth));
03356 #endif
03357 
03358 #if defined(PNG_READ_BACKGROUND_SUPPORTED)
03359 #if defined(PNG_READ_GAMMA_SUPPORTED)
03360 PNG_EXTERN void png_do_background PNGARG((png_row_infop row_info, png_bytep row,
03361    png_color_16p trans_values, png_color_16p background,
03362    png_color_16p background_1,
03363    png_bytep gamma_table, png_bytep gamma_from_1, png_bytep gamma_to_1,
03364    png_uint_16pp gamma_16, png_uint_16pp gamma_16_from_1,
03365    png_uint_16pp gamma_16_to_1, int gamma_shift));
03366 #else
03367 PNG_EXTERN void png_do_background PNGARG((png_row_infop row_info, png_bytep row,
03368    png_color_16p trans_values, png_color_16p background));
03369 #endif
03370 #endif
03371 
03372 #if defined(PNG_READ_GAMMA_SUPPORTED)
03373 PNG_EXTERN void png_do_gamma PNGARG((png_row_infop row_info, png_bytep row,
03374    png_bytep gamma_table, png_uint_16pp gamma_16_table,
03375    int gamma_shift));
03376 #endif
03377 
03378 #if defined(PNG_READ_EXPAND_SUPPORTED)
03379 PNG_EXTERN void png_do_expand_palette PNGARG((png_row_infop row_info,
03380    png_bytep row, png_colorp palette, png_bytep trans, int num_trans));
03381 PNG_EXTERN void png_do_expand PNGARG((png_row_infop row_info,
03382    png_bytep row, png_color_16p trans_value));
03383 #endif
03384 
03385 /* The following decodes the appropriate chunks, and does error correction,
03386  * then calls the appropriate callback for the chunk if it is valid.
03387  */
03388 
03389 /* decode the IHDR chunk */
03390 PNG_EXTERN void png_handle_IHDR PNGARG((png_structp png_ptr, png_infop info_ptr,
03391    png_uint_32 length));
03392 PNG_EXTERN void png_handle_PLTE PNGARG((png_structp png_ptr, png_infop info_ptr,
03393    png_uint_32 length));
03394 PNG_EXTERN void png_handle_IEND PNGARG((png_structp png_ptr, png_infop info_ptr,
03395    png_uint_32 length));
03396 
03397 #if defined(PNG_READ_bKGD_SUPPORTED)
03398 PNG_EXTERN void png_handle_bKGD PNGARG((png_structp png_ptr, png_infop info_ptr,
03399    png_uint_32 length));
03400 #endif
03401 
03402 #if defined(PNG_READ_cHRM_SUPPORTED)
03403 PNG_EXTERN void png_handle_cHRM PNGARG((png_structp png_ptr, png_infop info_ptr,
03404    png_uint_32 length));
03405 #endif
03406 
03407 #if defined(PNG_READ_gAMA_SUPPORTED)
03408 PNG_EXTERN void png_handle_gAMA PNGARG((png_structp png_ptr, png_infop info_ptr,
03409    png_uint_32 length));
03410 #endif
03411 
03412 #if defined(PNG_READ_hIST_SUPPORTED)
03413 PNG_EXTERN void png_handle_hIST PNGARG((png_structp png_ptr, png_infop info_ptr,
03414    png_uint_32 length));
03415 #endif
03416 
03417 #if defined(PNG_READ_iCCP_SUPPORTED)
03418 extern void png_handle_iCCP PNGARG((png_structp png_ptr, png_infop info_ptr,
03419    png_uint_32 length));
03420 #endif /* PNG_READ_iCCP_SUPPORTED */
03421 
03422 #if defined(PNG_READ_iTXt_SUPPORTED)
03423 PNG_EXTERN void png_handle_iTXt PNGARG((png_structp png_ptr, png_infop info_ptr,
03424    png_uint_32 length));
03425 #endif
03426 
03427 #if defined(PNG_READ_oFFs_SUPPORTED)
03428 PNG_EXTERN void png_handle_oFFs PNGARG((png_structp png_ptr, png_infop info_ptr,
03429    png_uint_32 length));
03430 #endif
03431 
03432 #if defined(PNG_READ_pCAL_SUPPORTED)
03433 PNG_EXTERN void png_handle_pCAL PNGARG((png_structp png_ptr, png_infop info_ptr,
03434    png_uint_32 length));
03435 #endif
03436 
03437 #if defined(PNG_READ_pHYs_SUPPORTED)
03438 PNG_EXTERN void png_handle_pHYs PNGARG((png_structp png_ptr, png_infop info_ptr,
03439    png_uint_32 length));
03440 #endif
03441 
03442 #if defined(PNG_READ_sBIT_SUPPORTED)
03443 PNG_EXTERN void png_handle_sBIT PNGARG((png_structp png_ptr, png_infop info_ptr,
03444    png_uint_32 length));
03445 #endif
03446 
03447 #if defined(PNG_READ_sCAL_SUPPORTED)
03448 PNG_EXTERN void png_handle_sCAL PNGARG((png_structp png_ptr, png_infop info_ptr,
03449    png_uint_32 length));
03450 #endif
03451 
03452 #if defined(PNG_READ_sPLT_SUPPORTED)
03453 extern void png_handle_sPLT PNGARG((png_structp png_ptr, png_infop info_ptr,
03454    png_uint_32 length));
03455 #endif /* PNG_READ_sPLT_SUPPORTED */
03456 
03457 #if defined(PNG_READ_sRGB_SUPPORTED)
03458 PNG_EXTERN void png_handle_sRGB PNGARG((png_structp png_ptr, png_infop info_ptr,
03459    png_uint_32 length));
03460 #endif
03461 
03462 #if defined(PNG_READ_tEXt_SUPPORTED)
03463 PNG_EXTERN void png_handle_tEXt PNGARG((png_structp png_ptr, png_infop info_ptr,
03464    png_uint_32 length));
03465 #endif
03466 
03467 #if defined(PNG_READ_tIME_SUPPORTED)
03468 PNG_EXTERN void png_handle_tIME PNGARG((png_structp png_ptr, png_infop info_ptr,
03469    png_uint_32 length));
03470 #endif
03471 
03472 #if defined(PNG_READ_tRNS_SUPPORTED)
03473 PNG_EXTERN void png_handle_tRNS PNGARG((png_structp png_ptr, png_infop info_ptr,
03474    png_uint_32 length));
03475 #endif
03476 
03477 #if defined(PNG_READ_zTXt_SUPPORTED)
03478 PNG_EXTERN void png_handle_zTXt PNGARG((png_structp png_ptr, png_infop info_ptr,
03479    png_uint_32 length));
03480 #endif
03481 
03482 PNG_EXTERN void png_handle_unknown PNGARG((png_structp png_ptr,
03483    png_infop info_ptr, png_uint_32 length));
03484 
03485 PNG_EXTERN void png_check_chunk_name PNGARG((png_structp png_ptr,
03486    png_bytep chunk_name));
03487 
03488 /* handle the transformations for reading and writing */
03489 PNG_EXTERN void png_do_read_transformations PNGARG((png_structp png_ptr));
03490 PNG_EXTERN void png_do_write_transformations PNGARG((png_structp png_ptr));
03491 
03492 PNG_EXTERN void png_init_read_transformations PNGARG((png_structp png_ptr));
03493 
03494 #ifdef PNG_PROGRESSIVE_READ_SUPPORTED
03495 PNG_EXTERN void png_push_read_chunk PNGARG((png_structp png_ptr,
03496    png_infop info_ptr));
03497 PNG_EXTERN void png_push_read_sig PNGARG((png_structp png_ptr,
03498    png_infop info_ptr));
03499 PNG_EXTERN void png_push_check_crc PNGARG((png_structp png_ptr));
03500 PNG_EXTERN void png_push_crc_skip PNGARG((png_structp png_ptr,
03501    png_uint_32 length));
03502 PNG_EXTERN void png_push_crc_finish PNGARG((png_structp png_ptr));
03503 PNG_EXTERN void png_push_save_buffer PNGARG((png_structp png_ptr));
03504 PNG_EXTERN void png_push_restore_buffer PNGARG((png_structp png_ptr,
03505    png_bytep buffer, png_size_t buffer_length));
03506 PNG_EXTERN void png_push_read_IDAT PNGARG((png_structp png_ptr));
03507 PNG_EXTERN void png_process_IDAT_data PNGARG((png_structp png_ptr,
03508    png_bytep buffer, png_size_t buffer_length));
03509 PNG_EXTERN void png_push_process_row PNGARG((png_structp png_ptr));
03510 PNG_EXTERN void png_push_handle_unknown PNGARG((png_structp png_ptr,
03511    png_infop info_ptr, png_uint_32 length));
03512 PNG_EXTERN void png_push_have_info PNGARG((png_structp png_ptr,
03513    png_infop info_ptr));
03514 PNG_EXTERN void png_push_have_end PNGARG((png_structp png_ptr,
03515    png_infop info_ptr));
03516 PNG_EXTERN void png_push_have_row PNGARG((png_structp png_ptr, png_bytep row));
03517 PNG_EXTERN void png_push_read_end PNGARG((png_structp png_ptr,
03518    png_infop info_ptr));
03519 PNG_EXTERN void png_process_some_data PNGARG((png_structp png_ptr,
03520    png_infop info_ptr));
03521 PNG_EXTERN void png_read_push_finish_row PNGARG((png_structp png_ptr));
03522 #if defined(PNG_READ_tEXt_SUPPORTED)
03523 PNG_EXTERN void png_push_handle_tEXt PNGARG((png_structp png_ptr,
03524    png_infop info_ptr, png_uint_32 length));
03525 PNG_EXTERN void png_push_read_tEXt PNGARG((png_structp png_ptr,
03526    png_infop info_ptr));
03527 #endif
03528 #if defined(PNG_READ_zTXt_SUPPORTED)
03529 PNG_EXTERN void png_push_handle_zTXt PNGARG((png_structp png_ptr,
03530    png_infop info_ptr, png_uint_32 length));
03531 PNG_EXTERN void png_push_read_zTXt PNGARG((png_structp png_ptr,
03532    png_infop info_ptr));
03533 #endif
03534 #if defined(PNG_READ_iTXt_SUPPORTED)
03535 PNG_EXTERN void png_push_handle_iTXt PNGARG((png_structp png_ptr,
03536    png_infop info_ptr, png_uint_32 length));
03537 PNG_EXTERN void png_push_read_iTXt PNGARG((png_structp png_ptr,
03538    png_infop info_ptr));
03539 #endif
03540 
03541 #endif /* PNG_PROGRESSIVE_READ_SUPPORTED */
03542 
03543 #ifdef PNG_MNG_FEATURES_SUPPORTED
03544 PNG_EXTERN void png_do_read_intrapixel PNGARG((png_row_infop row_info,
03545    png_bytep row));
03546 PNG_EXTERN void png_do_write_intrapixel PNGARG((png_row_infop row_info,
03547    png_bytep row));
03548 #endif
03549 
03550 #if defined(PNG_ASSEMBLER_CODE_SUPPORTED)
03551 #if defined(PNG_MMX_CODE_SUPPORTED)
03552 /* png.c */ /* PRIVATE */
03553 PNG_EXTERN void png_init_mmx_flags PNGARG((png_structp png_ptr));
03554 #endif
03555 #endif
03556 
03557 #if defined(PNG_INCH_CONVERSIONS) && defined(PNG_FLOATING_POINT_SUPPORTED)
03558 PNG_EXTERN png_uint_32 png_get_pixels_per_inch PNGARG((png_structp png_ptr,
03559 png_infop info_ptr));
03560 
03561 PNG_EXTERN png_uint_32 png_get_x_pixels_per_inch PNGARG((png_structp png_ptr,
03562 png_infop info_ptr));
03563 
03564 PNG_EXTERN png_uint_32 png_get_y_pixels_per_inch PNGARG((png_structp png_ptr,
03565 png_infop info_ptr));
03566 
03567 PNG_EXTERN float png_get_x_offset_inches PNGARG((png_structp png_ptr,
03568 png_infop info_ptr));
03569 
03570 PNG_EXTERN float png_get_y_offset_inches PNGARG((png_structp png_ptr,
03571 png_infop info_ptr));
03572 
03573 #if defined(PNG_pHYs_SUPPORTED)
03574 PNG_EXTERN png_uint_32 png_get_pHYs_dpi PNGARG((png_structp png_ptr,
03575 png_infop info_ptr, png_uint_32 *res_x, png_uint_32 *res_y, int *unit_type));
03576 #endif /* PNG_pHYs_SUPPORTED */
03577 #endif  /* PNG_INCH_CONVERSIONS && PNG_FLOATING_POINT_SUPPORTED */
03578 
03579 /* Read the chunk header (length + type name) */
03580 PNG_EXTERN png_uint_32 png_read_chunk_header PNGARG((png_structp png_ptr));
03581 
03582 /* Maintainer: Put new private prototypes here ^ and in libpngpf.3 */
03583 
03584 #endif /* PNG_INTERNAL */
03585 
03586 #ifdef __cplusplus
03587 }
03588 #endif
03589 
03590 #endif /* PNG_VERSION_INFO_ONLY */
03591 /* do not put anything past this line */
03592 #endif /* PNG_H */


openhrp3
Author(s): AIST, General Robotix Inc., Nakamura Lab of Dept. of Mechano Informatics at University of Tokyo
autogenerated on Thu Apr 11 2019 03:30:18