1.1 --- /dev/null	Thu Jan 01 00:00:00 1970 +0000
     1.2 +++ b/libs/libpng/png.h	Sun Nov 01 00:36:56 2015 +0200
     1.3 @@ -0,0 +1,3597 @@
     1.4 +/* png.h - header file for PNG reference library
     1.5 + *
     1.6 + * libpng version 1.2.33 - October 31, 2008
     1.7 + * Copyright (c) 1998-2008 Glenn Randers-Pehrson
     1.8 + * (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger)
     1.9 + * (Version 0.88 Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.)
    1.10 + *
    1.11 + * Authors and maintainers:
    1.12 + *  libpng versions 0.71, May 1995, through 0.88, January 1996: Guy Schalnat
    1.13 + *  libpng versions 0.89c, June 1996, through 0.96, May 1997: Andreas Dilger
    1.14 + *  libpng versions 0.97, January 1998, through 1.2.33 - October 31, 2008: Glenn
    1.15 + *  See also "Contributing Authors", below.
    1.16 + *
    1.17 + * Note about libpng version numbers:
    1.18 + *
    1.19 + *    Due to various miscommunications, unforeseen code incompatibilities
    1.20 + *    and occasional factors outside the authors' control, version numbering
    1.21 + *    on the library has not always been consistent and straightforward.
    1.22 + *    The following table summarizes matters since version 0.89c, which was
    1.23 + *    the first widely used release:
    1.24 + *
    1.25 + *    source                 png.h  png.h  shared-lib
    1.26 + *    version                string   int  version
    1.27 + *    -------                ------ -----  ----------
    1.28 + *    0.89c "1.0 beta 3"     0.89      89  1.0.89
    1.29 + *    0.90  "1.0 beta 4"     0.90      90  0.90  [should have been 2.0.90]
    1.30 + *    0.95  "1.0 beta 5"     0.95      95  0.95  [should have been 2.0.95]
    1.31 + *    0.96  "1.0 beta 6"     0.96      96  0.96  [should have been 2.0.96]
    1.32 + *    0.97b "1.00.97 beta 7" 1.00.97   97  1.0.1 [should have been 2.0.97]
    1.33 + *    0.97c                  0.97      97  2.0.97
    1.34 + *    0.98                   0.98      98  2.0.98
    1.35 + *    0.99                   0.99      98  2.0.99
    1.36 + *    0.99a-m                0.99      99  2.0.99
    1.37 + *    1.00                   1.00     100  2.1.0 [100 should be 10000]
    1.38 + *    1.0.0      (from here on, the   100  2.1.0 [100 should be 10000]
    1.39 + *    1.0.1       png.h string is   10001  2.1.0
    1.40 + *    1.0.1a-e    identical to the  10002  from here on, the shared library
    1.41 + *    1.0.2       source version)   10002  is 2.V where V is the source code
    1.42 + *    1.0.2a-b                      10003  version, except as noted.
    1.43 + *    1.0.3                         10003
    1.44 + *    1.0.3a-d                      10004
    1.45 + *    1.0.4                         10004
    1.46 + *    1.0.4a-f                      10005
    1.47 + *    1.0.5 (+ 2 patches)           10005
    1.48 + *    1.0.5a-d                      10006
    1.49 + *    1.0.5e-r                      10100 (not source compatible)
    1.50 + *    1.0.5s-v                      10006 (not binary compatible)
    1.51 + *    1.0.6 (+ 3 patches)           10006 (still binary incompatible)
    1.52 + *    1.0.6d-f                      10007 (still binary incompatible)
    1.53 + *    1.0.6g                        10007
    1.54 + *    1.0.6h                        10007  10.6h (testing xy.z so-numbering)
    1.55 + *    1.0.6i                        10007  10.6i
    1.56 + *    1.0.6j                        10007  2.1.0.6j (incompatible with 1.0.0)
    1.57 + *    1.0.7beta11-14        DLLNUM  10007  2.1.0.7beta11-14 (binary compatible)
    1.58 + *    1.0.7beta15-18           1    10007  2.1.0.7beta15-18 (binary compatible)
    1.59 + *    1.0.7rc1-2               1    10007  2.1.0.7rc1-2 (binary compatible)
    1.60 + *    1.0.7                    1    10007  (still compatible)
    1.61 + *    1.0.8beta1-4             1    10008  2.1.0.8beta1-4
    1.62 + *    1.0.8rc1                 1    10008  2.1.0.8rc1
    1.63 + *    1.0.8                    1    10008  2.1.0.8
    1.64 + *    1.0.9beta1-6             1    10009  2.1.0.9beta1-6
    1.65 + *    1.0.9rc1                 1    10009  2.1.0.9rc1
    1.66 + *    1.0.9beta7-10            1    10009  2.1.0.9beta7-10
    1.67 + *    1.0.9rc2                 1    10009  2.1.0.9rc2
    1.68 + *    1.0.9                    1    10009  2.1.0.9
    1.69 + *    1.0.10beta1              1    10010  2.1.0.10beta1
    1.70 + *    1.0.10rc1                1    10010  2.1.0.10rc1
    1.71 + *    1.0.10                   1    10010  2.1.0.10
    1.72 + *    1.0.11beta1-3            1    10011  2.1.0.11beta1-3
    1.73 + *    1.0.11rc1                1    10011  2.1.0.11rc1
    1.74 + *    1.0.11                   1    10011  2.1.0.11
    1.75 + *    1.0.12beta1-2            2    10012  2.1.0.12beta1-2
    1.76 + *    1.0.12rc1                2    10012  2.1.0.12rc1
    1.77 + *    1.0.12                   2    10012  2.1.0.12
    1.78 + *    1.1.0a-f                 -    10100  2.1.1.0a-f (branch abandoned)
    1.79 + *    1.2.0beta1-2             2    10200  2.1.2.0beta1-2
    1.80 + *    1.2.0beta3-5             3    10200  3.1.2.0beta3-5
    1.81 + *    1.2.0rc1                 3    10200  3.1.2.0rc1
    1.82 + *    1.2.0                    3    10200  3.1.2.0
    1.83 + *    1.2.1beta1-4             3    10201  3.1.2.1beta1-4
    1.84 + *    1.2.1rc1-2               3    10201  3.1.2.1rc1-2
    1.85 + *    1.2.1                    3    10201  3.1.2.1
    1.86 + *    1.2.2beta1-6            12    10202  12.so.0.1.2.2beta1-6
    1.87 + *    1.0.13beta1             10    10013  10.so.0.1.0.13beta1
    1.88 + *    1.0.13rc1               10    10013  10.so.0.1.0.13rc1
    1.89 + *    1.2.2rc1                12    10202  12.so.0.1.2.2rc1
    1.90 + *    1.0.13                  10    10013  10.so.0.1.0.13
    1.91 + *    1.2.2                   12    10202  12.so.0.1.2.2
    1.92 + *    1.2.3rc1-6              12    10203  12.so.0.1.2.3rc1-6
    1.93 + *    1.2.3                   12    10203  12.so.0.1.2.3
    1.94 + *    1.2.4beta1-3            13    10204  12.so.0.1.2.4beta1-3
    1.95 + *    1.0.14rc1               13    10014  10.so.0.1.0.14rc1
    1.96 + *    1.2.4rc1                13    10204  12.so.0.1.2.4rc1
    1.97 + *    1.0.14                  10    10014  10.so.0.1.0.14
    1.98 + *    1.2.4                   13    10204  12.so.0.1.2.4
    1.99 + *    1.2.5beta1-2            13    10205  12.so.0.1.2.5beta1-2
   1.100 + *    1.0.15rc1-3             10    10015  10.so.0.1.0.15rc1-3
   1.101 + *    1.2.5rc1-3              13    10205  12.so.0.1.2.5rc1-3
   1.102 + *    1.0.15                  10    10015  10.so.0.1.0.15
   1.103 + *    1.2.5                   13    10205  12.so.0.1.2.5
   1.104 + *    1.2.6beta1-4            13    10206  12.so.0.1.2.6beta1-4
   1.105 + *    1.0.16                  10    10016  10.so.0.1.0.16
   1.106 + *    1.2.6                   13    10206  12.so.0.1.2.6
   1.107 + *    1.2.7beta1-2            13    10207  12.so.0.1.2.7beta1-2
   1.108 + *    1.0.17rc1               10    10017  10.so.0.1.0.17rc1
   1.109 + *    1.2.7rc1                13    10207  12.so.0.1.2.7rc1
   1.110 + *    1.0.17                  10    10017  10.so.0.1.0.17
   1.111 + *    1.2.7                   13    10207  12.so.0.1.2.7
   1.112 + *    1.2.8beta1-5            13    10208  12.so.0.1.2.8beta1-5
   1.113 + *    1.0.18rc1-5             10    10018  10.so.0.1.0.18rc1-5
   1.114 + *    1.2.8rc1-5              13    10208  12.so.0.1.2.8rc1-5
   1.115 + *    1.0.18                  10    10018  10.so.0.1.0.18
   1.116 + *    1.2.8                   13    10208  12.so.0.1.2.8
   1.117 + *    1.2.9beta1-3            13    10209  12.so.0.1.2.9beta1-3
   1.118 + *    1.2.9beta4-11           13    10209  12.so.0.9[.0]
   1.119 + *    1.2.9rc1                13    10209  12.so.0.9[.0]
   1.120 + *    1.2.9                   13    10209  12.so.0.9[.0]
   1.121 + *    1.2.10beta1-8           13    10210  12.so.0.10[.0]
   1.122 + *    1.2.10rc1-3             13    10210  12.so.0.10[.0]
   1.123 + *    1.2.10                  13    10210  12.so.0.10[.0]
   1.124 + *    1.2.11beta1-4           13    10211  12.so.0.11[.0]
   1.125 + *    1.0.19rc1-5             10    10019  10.so.0.19[.0]
   1.126 + *    1.2.11rc1-5             13    10211  12.so.0.11[.0]
   1.127 + *    1.0.19                  10    10019  10.so.0.19[.0]
   1.128 + *    1.2.11                  13    10211  12.so.0.11[.0]
   1.129 + *    1.0.20                  10    10020  10.so.0.20[.0]
   1.130 + *    1.2.12                  13    10212  12.so.0.12[.0]
   1.131 + *    1.2.13beta1             13    10213  12.so.0.13[.0]
   1.132 + *    1.0.21                  10    10021  10.so.0.21[.0]
   1.133 + *    1.2.13                  13    10213  12.so.0.13[.0]
   1.134 + *    1.2.14beta1-2           13    10214  12.so.0.14[.0]
   1.135 + *    1.0.22rc1               10    10022  10.so.0.22[.0]
   1.136 + *    1.2.14rc1               13    10214  12.so.0.14[.0]
   1.137 + *    1.0.22                  10    10022  10.so.0.22[.0]
   1.138 + *    1.2.14                  13    10214  12.so.0.14[.0]
   1.139 + *    1.2.15beta1-6           13    10215  12.so.0.15[.0]
   1.140 + *    1.0.23rc1-5             10    10023  10.so.0.23[.0]
   1.141 + *    1.2.15rc1-5             13    10215  12.so.0.15[.0]
   1.142 + *    1.0.23                  10    10023  10.so.0.23[.0]
   1.143 + *    1.2.15                  13    10215  12.so.0.15[.0]
   1.144 + *    1.2.16beta1-2           13    10216  12.so.0.16[.0]
   1.145 + *    1.2.16rc1               13    10216  12.so.0.16[.0]
   1.146 + *    1.0.24                  10    10024  10.so.0.24[.0]
   1.147 + *    1.2.16                  13    10216  12.so.0.16[.0]
   1.148 + *    1.2.17beta1-2           13    10217  12.so.0.17[.0]
   1.149 + *    1.0.25rc1               10    10025  10.so.0.25[.0]
   1.150 + *    1.2.17rc1-3             13    10217  12.so.0.17[.0]
   1.151 + *    1.0.25                  10    10025  10.so.0.25[.0]
   1.152 + *    1.2.17                  13    10217  12.so.0.17[.0]
   1.153 + *    1.0.26                  10    10026  10.so.0.26[.0]
   1.154 + *    1.2.18                  13    10218  12.so.0.18[.0]
   1.155 + *    1.2.19beta1-31          13    10219  12.so.0.19[.0]
   1.156 + *    1.0.27rc1-6             10    10027  10.so.0.27[.0]
   1.157 + *    1.2.19rc1-6             13    10219  12.so.0.19[.0]
   1.158 + *    1.0.27                  10    10027  10.so.0.27[.0]
   1.159 + *    1.2.19                  13    10219  12.so.0.19[.0]
   1.160 + *    1.2.20beta01-04         13    10220  12.so.0.20[.0]
   1.161 + *    1.0.28rc1-6             10    10028  10.so.0.28[.0]
   1.162 + *    1.2.20rc1-6             13    10220  12.so.0.20[.0]
   1.163 + *    1.0.28                  10    10028  10.so.0.28[.0]
   1.164 + *    1.2.20                  13    10220  12.so.0.20[.0]
   1.165 + *    1.2.21beta1-2           13    10221  12.so.0.21[.0]
   1.166 + *    1.2.21rc1-3             13    10221  12.so.0.21[.0]
   1.167 + *    1.0.29                  10    10029  10.so.0.29[.0]
   1.168 + *    1.2.21                  13    10221  12.so.0.21[.0]
   1.169 + *    1.2.22beta1-4           13    10222  12.so.0.22[.0]
   1.170 + *    1.0.30rc1               10    10030  10.so.0.30[.0]
   1.171 + *    1.2.22rc1               13    10222  12.so.0.22[.0]
   1.172 + *    1.0.30                  10    10030  10.so.0.30[.0]
   1.173 + *    1.2.22                  13    10222  12.so.0.22[.0]
   1.174 + *    1.2.23beta01-05         13    10223  12.so.0.23[.0]
   1.175 + *    1.2.23rc01              13    10223  12.so.0.23[.0]
   1.176 + *    1.2.23                  13    10223  12.so.0.23[.0]
   1.177 + *    1.2.24beta01-02         13    10224  12.so.0.24[.0]
   1.178 + *    1.2.24rc01              13    10224  12.so.0.24[.0]
   1.179 + *    1.2.24                  13    10224  12.so.0.24[.0]
   1.180 + *    1.2.25beta01-06         13    10225  12.so.0.25[.0]
   1.181 + *    1.2.25rc01-02           13    10225  12.so.0.25[.0]
   1.182 + *    1.0.31                  10    10031  10.so.0.31[.0]
   1.183 + *    1.2.25                  13    10225  12.so.0.25[.0]
   1.184 + *    1.2.26beta01-06         13    10226  12.so.0.26[.0]
   1.185 + *    1.2.26rc01              13    10226  12.so.0.26[.0]
   1.186 + *    1.2.26                  13    10226  12.so.0.26[.0]
   1.187 + *    1.0.32                  10    10032  10.so.0.32[.0]
   1.188 + *    1.2.27beta01-06         13    10227  12.so.0.27[.0]
   1.189 + *    1.2.27rc01              13    10227  12.so.0.27[.0]
   1.190 + *    1.0.33                  10    10033  10.so.0.33[.0]
   1.191 + *    1.2.27                  13    10227  12.so.0.27[.0]
   1.192 + *    1.0.34                  10    10034  10.so.0.34[.0]
   1.193 + *    1.2.28                  13    10228  12.so.0.28[.0]
   1.194 + *    1.2.29beta01-03         13    10229  12.so.0.29[.0]
   1.195 + *    1.2.29rc01              13    10229  12.so.0.29[.0]
   1.196 + *    1.0.35                  10    10035  10.so.0.35[.0]
   1.197 + *    1.2.29                  13    10229  12.so.0.29[.0]
   1.198 + *    1.0.37                  10    10037  10.so.0.37[.0]
   1.199 + *    1.2.30beta01-04         13    10230  12.so.0.30[.0]
   1.200 + *    1.0.38rc01-08           10    10038  10.so.0.38[.0]
   1.201 + *    1.2.30rc01-08           13    10230  12.so.0.30[.0]
   1.202 + *    1.0.38                  10    10038  10.so.0.38[.0]
   1.203 + *    1.2.30                  13    10230  12.so.0.30[.0]
   1.204 + *    1.0.39rc01-03           10    10039  10.so.0.39[.0]
   1.205 + *    1.2.31rc01-03           13    10231  12.so.0.31[.0]
   1.206 + *    1.0.39                  10    10039  10.so.0.39[.0]
   1.207 + *    1.2.31                  13    10231  12.so.0.31[.0]
   1.208 + *    1.2.32beta01-02         13    10232  12.so.0.32[.0]
   1.209 + *    1.0.40rc01              10    10040  10.so.0.40[.0]
   1.210 + *    1.2.32rc01              13    10232  12.so.0.32[.0]
   1.211 + *    1.0.40                  10    10040  10.so.0.40[.0]
   1.212 + *    1.2.32                  13    10232  12.so.0.32[.0]
   1.213 + *    1.2.33beta01-02         13    10233  12.so.0.33[.0]
   1.214 + *    1.2.33rc01-02           13    10233  12.so.0.33[.0]
   1.215 + *    1.0.41rc01              10    10041  10.so.0.41[.0]
   1.216 + *    1.2.33                  13    10233  12.so.0.33[.0]
   1.217 + *    1.0.41                  10    10041  10.so.0.41[.0]
   1.218 + *
   1.219 + *    Henceforth the source version will match the shared-library major
   1.220 + *    and minor numbers; the shared-library major version number will be
   1.221 + *    used for changes in backward compatibility, as it is intended.  The
   1.222 + *    PNG_LIBPNG_VER macro, which is not used within libpng but is available
   1.223 + *    for applications, is an unsigned integer of the form xyyzz corresponding
   1.224 + *    to the source version x.y.z (leading zeros in y and z).  Beta versions
   1.225 + *    were given the previous public release number plus a letter, until
   1.226 + *    version 1.0.6j; from then on they were given the upcoming public
   1.227 + *    release number plus "betaNN" or "rcNN".
   1.228 + *
   1.229 + *    Binary incompatibility exists only when applications make direct access
   1.230 + *    to the info_ptr or png_ptr members through png.h, and the compiled
   1.231 + *    application is loaded with a different version of the library.
   1.232 + *
   1.233 + *    DLLNUM will change each time there are forward or backward changes
   1.234 + *    in binary compatibility (e.g., when a new feature is added).
   1.235 + *
   1.236 + * See libpng.txt or libpng.3 for more information.  The PNG specification
   1.237 + * is available as a W3C Recommendation and as an ISO Specification,
   1.238 + * <http://www.w3.org/TR/2003/REC-PNG-20031110/
   1.239 + */
   1.240 +
   1.241 +/*
   1.242 + * COPYRIGHT NOTICE, DISCLAIMER, and LICENSE:
   1.243 + *
   1.244 + * If you modify libpng you may insert additional notices immediately following
   1.245 + * this sentence.
   1.246 + *
   1.247 + * libpng versions 1.2.6, August 15, 2004, through 1.2.33, October 31, 2008, are
   1.248 + * Copyright (c) 2004, 2006-2008 Glenn Randers-Pehrson, and are
   1.249 + * distributed according to the same disclaimer and license as libpng-1.2.5
   1.250 + * with the following individual added to the list of Contributing Authors:
   1.251 + *
   1.252 + *    Cosmin Truta
   1.253 + *
   1.254 + * libpng versions 1.0.7, July 1, 2000, through 1.2.5, October 3, 2002, are
   1.255 + * Copyright (c) 2000-2002 Glenn Randers-Pehrson, and are
   1.256 + * distributed according to the same disclaimer and license as libpng-1.0.6
   1.257 + * with the following individuals added to the list of Contributing Authors:
   1.258 + *
   1.259 + *    Simon-Pierre Cadieux
   1.260 + *    Eric S. Raymond
   1.261 + *    Gilles Vollant
   1.262 + *
   1.263 + * and with the following additions to the disclaimer:
   1.264 + *
   1.265 + *    There is no warranty against interference with your enjoyment of the
   1.266 + *    library or against infringement.  There is no warranty that our
   1.267 + *    efforts or the library will fulfill any of your particular purposes
   1.268 + *    or needs.  This library is provided with all faults, and the entire
   1.269 + *    risk of satisfactory quality, performance, accuracy, and effort is with
   1.270 + *    the user.
   1.271 + *
   1.272 + * libpng versions 0.97, January 1998, through 1.0.6, March 20, 2000, are
   1.273 + * Copyright (c) 1998, 1999, 2000 Glenn Randers-Pehrson, and are
   1.274 + * distributed according to the same disclaimer and license as libpng-0.96,
   1.275 + * with the following individuals added to the list of Contributing Authors:
   1.276 + *
   1.277 + *    Tom Lane
   1.278 + *    Glenn Randers-Pehrson
   1.279 + *    Willem van Schaik
   1.280 + *
   1.281 + * libpng versions 0.89, June 1996, through 0.96, May 1997, are
   1.282 + * Copyright (c) 1996, 1997 Andreas Dilger
   1.283 + * Distributed according to the same disclaimer and license as libpng-0.88,
   1.284 + * with the following individuals added to the list of Contributing Authors:
   1.285 + *
   1.286 + *    John Bowler
   1.287 + *    Kevin Bracey
   1.288 + *    Sam Bushell
   1.289 + *    Magnus Holmgren
   1.290 + *    Greg Roelofs
   1.291 + *    Tom Tanner
   1.292 + *
   1.293 + * libpng versions 0.5, May 1995, through 0.88, January 1996, are
   1.294 + * Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.
   1.295 + *
   1.296 + * For the purposes of this copyright and license, "Contributing Authors"
   1.297 + * is defined as the following set of individuals:
   1.298 + *
   1.299 + *    Andreas Dilger
   1.300 + *    Dave Martindale
   1.301 + *    Guy Eric Schalnat
   1.302 + *    Paul Schmidt
   1.303 + *    Tim Wegner
   1.304 + *
   1.305 + * The PNG Reference Library is supplied "AS IS".  The Contributing Authors
   1.306 + * and Group 42, Inc. disclaim all warranties, expressed or implied,
   1.307 + * including, without limitation, the warranties of merchantability and of
   1.308 + * fitness for any purpose.  The Contributing Authors and Group 42, Inc.
   1.309 + * assume no liability for direct, indirect, incidental, special, exemplary,
   1.310 + * or consequential damages, which may result from the use of the PNG
   1.311 + * Reference Library, even if advised of the possibility of such damage.
   1.312 + *
   1.313 + * Permission is hereby granted to use, copy, modify, and distribute this
   1.314 + * source code, or portions hereof, for any purpose, without fee, subject
   1.315 + * to the following restrictions:
   1.316 + *
   1.317 + * 1. The origin of this source code must not be misrepresented.
   1.318 + *
   1.319 + * 2. Altered versions must be plainly marked as such and
   1.320 + * must not be misrepresented as being the original source.
   1.321 + *
   1.322 + * 3. This Copyright notice may not be removed or altered from
   1.323 + *    any source or altered source distribution.
   1.324 + *
   1.325 + * The Contributing Authors and Group 42, Inc. specifically permit, without
   1.326 + * fee, and encourage the use of this source code as a component to
   1.327 + * supporting the PNG file format in commercial products.  If you use this
   1.328 + * source code in a product, acknowledgment is not required but would be
   1.329 + * appreciated.
   1.330 + */
   1.331 +
   1.332 +/*
   1.333 + * A "png_get_copyright" function is available, for convenient use in "about"
   1.334 + * boxes and the like:
   1.335 + *
   1.336 + * printf("%s",png_get_copyright(NULL));
   1.337 + *
   1.338 + * Also, the PNG logo (in PNG format, of course) is supplied in the
   1.339 + * files "pngbar.png" and "pngbar.jpg (88x31) and "pngnow.png" (98x31).
   1.340 + */
   1.341 +
   1.342 +/*
   1.343 + * Libpng is OSI Certified Open Source Software.  OSI Certified is a
   1.344 + * certification mark of the Open Source Initiative.
   1.345 + */
   1.346 +
   1.347 +/*
   1.348 + * The contributing authors would like to thank all those who helped
   1.349 + * with testing, bug fixes, and patience.  This wouldn't have been
   1.350 + * possible without all of you.
   1.351 + *
   1.352 + * Thanks to Frank J. T. Wojcik for helping with the documentation.
   1.353 + */
   1.354 +
   1.355 +/*
   1.356 + * Y2K compliance in libpng:
   1.357 + * =========================
   1.358 + *
   1.359 + *    October 31, 2008
   1.360 + *
   1.361 + *    Since the PNG Development group is an ad-hoc body, we can't make
   1.362 + *    an official declaration.
   1.363 + *
   1.364 + *    This is your unofficial assurance that libpng from version 0.71 and
   1.365 + *    upward through 1.2.33 are Y2K compliant.  It is my belief that earlier
   1.366 + *    versions were also Y2K compliant.
   1.367 + *
   1.368 + *    Libpng only has three year fields.  One is a 2-byte unsigned integer
   1.369 + *    that will hold years up to 65535.  The other two hold the date in text
   1.370 + *    format, and will hold years up to 9999.
   1.371 + *
   1.372 + *    The integer is
   1.373 + *        "png_uint_16 year" in png_time_struct.
   1.374 + *
   1.375 + *    The strings are
   1.376 + *        "png_charp time_buffer" in png_struct and
   1.377 + *        "near_time_buffer", which is a local character string in png.c.
   1.378 + *
   1.379 + *    There are seven time-related functions:
   1.380 + *        png.c: png_convert_to_rfc_1123() in png.c
   1.381 + *          (formerly png_convert_to_rfc_1152() in error)
   1.382 + *        png_convert_from_struct_tm() in pngwrite.c, called in pngwrite.c
   1.383 + *        png_convert_from_time_t() in pngwrite.c
   1.384 + *        png_get_tIME() in pngget.c
   1.385 + *        png_handle_tIME() in pngrutil.c, called in pngread.c
   1.386 + *        png_set_tIME() in pngset.c
   1.387 + *        png_write_tIME() in pngwutil.c, called in pngwrite.c
   1.388 + *
   1.389 + *    All handle dates properly in a Y2K environment.  The
   1.390 + *    png_convert_from_time_t() function calls gmtime() to convert from system
   1.391 + *    clock time, which returns (year - 1900), which we properly convert to
   1.392 + *    the full 4-digit year.  There is a possibility that applications using
   1.393 + *    libpng are not passing 4-digit years into the png_convert_to_rfc_1123()
   1.394 + *    function, or that they are incorrectly passing only a 2-digit year
   1.395 + *    instead of "year - 1900" into the png_convert_from_struct_tm() function,
   1.396 + *    but this is not under our control.  The libpng documentation has always
   1.397 + *    stated that it works with 4-digit years, and the APIs have been
   1.398 + *    documented as such.
   1.399 + *
   1.400 + *    The tIME chunk itself is also Y2K compliant.  It uses a 2-byte unsigned
   1.401 + *    integer to hold the year, and can hold years as large as 65535.
   1.402 + *
   1.403 + *    zlib, upon which libpng depends, is also Y2K compliant.  It contains
   1.404 + *    no date-related code.
   1.405 + *
   1.406 + *       Glenn Randers-Pehrson
   1.407 + *       libpng maintainer
   1.408 + *       PNG Development Group
   1.409 + */
   1.410 +
   1.411 +#ifndef PNG_H
   1.412 +#define PNG_H
   1.413 +
   1.414 +/* This is not the place to learn how to use libpng.  The file libpng.txt
   1.415 + * describes how to use libpng, and the file example.c summarizes it
   1.416 + * with some code on which to build.  This file is useful for looking
   1.417 + * at the actual function definitions and structure components.
   1.418 + */
   1.419 +
   1.420 +/* Version information for png.h - this should match the version in png.c */
   1.421 +#define PNG_LIBPNG_VER_STRING "1.2.33"
   1.422 +#define PNG_HEADER_VERSION_STRING \
   1.423 +   " libpng version 1.2.33 - October 31, 2008\n"
   1.424 +
   1.425 +#define PNG_LIBPNG_VER_SONUM   0
   1.426 +#define PNG_LIBPNG_VER_DLLNUM  13
   1.427 +
   1.428 +/* These should match the first 3 components of PNG_LIBPNG_VER_STRING: */
   1.429 +#define PNG_LIBPNG_VER_MAJOR   1
   1.430 +#define PNG_LIBPNG_VER_MINOR   2
   1.431 +#define PNG_LIBPNG_VER_RELEASE 33
   1.432 +/* This should match the numeric part of the final component of
   1.433 + * PNG_LIBPNG_VER_STRING, omitting any leading zero: */
   1.434 +
   1.435 +#define PNG_LIBPNG_VER_BUILD  0
   1.436 +
   1.437 +/* Release Status */
   1.438 +#define PNG_LIBPNG_BUILD_ALPHA    1
   1.439 +#define PNG_LIBPNG_BUILD_BETA     2
   1.440 +#define PNG_LIBPNG_BUILD_RC       3
   1.441 +#define PNG_LIBPNG_BUILD_STABLE   4
   1.442 +#define PNG_LIBPNG_BUILD_RELEASE_STATUS_MASK 7
   1.443 +  
   1.444 +/* Release-Specific Flags */
   1.445 +#define PNG_LIBPNG_BUILD_PATCH    8 /* Can be OR'ed with
   1.446 +                                       PNG_LIBPNG_BUILD_STABLE only */
   1.447 +#define PNG_LIBPNG_BUILD_PRIVATE 16 /* Cannot be OR'ed with
   1.448 +                                       PNG_LIBPNG_BUILD_SPECIAL */
   1.449 +#define PNG_LIBPNG_BUILD_SPECIAL 32 /* Cannot be OR'ed with
   1.450 +                                       PNG_LIBPNG_BUILD_PRIVATE */
   1.451 +
   1.452 +#define PNG_LIBPNG_BUILD_BASE_TYPE PNG_LIBPNG_BUILD_STABLE
   1.453 +
   1.454 +/* Careful here.  At one time, Guy wanted to use 082, but that would be octal.
   1.455 + * We must not include leading zeros.
   1.456 + * Versions 0.7 through 1.0.0 were in the range 0 to 100 here (only
   1.457 + * version 1.0.0 was mis-numbered 100 instead of 10000).  From
   1.458 + * version 1.0.1 it's    xxyyzz, where x=major, y=minor, z=release */
   1.459 +#define PNG_LIBPNG_VER 10233 /* 1.2.33 */
   1.460 +
   1.461 +#ifndef PNG_VERSION_INFO_ONLY
   1.462 +/* include the compression library's header */
   1.463 +#include "zlib.h"
   1.464 +#endif
   1.465 +
   1.466 +/* include all user configurable info, including optional assembler routines */
   1.467 +#include "pngconf.h"
   1.468 +
   1.469 +/*
   1.470 + * Added at libpng-1.2.8 */
   1.471 +/* Ref MSDN: Private as priority over Special
   1.472 + * VS_FF_PRIVATEBUILD File *was not* built using standard release
   1.473 + * procedures. If this value is given, the StringFileInfo block must
   1.474 + * contain a PrivateBuild string. 
   1.475 + *
   1.476 + * VS_FF_SPECIALBUILD File *was* built by the original company using
   1.477 + * standard release procedures but is a variation of the standard
   1.478 + * file of the same version number. If this value is given, the
   1.479 + * StringFileInfo block must contain a SpecialBuild string. 
   1.480 + */
   1.481 +
   1.482 +#if defined(PNG_USER_PRIVATEBUILD)
   1.483 +#  define PNG_LIBPNG_BUILD_TYPE \
   1.484 +          (PNG_LIBPNG_BUILD_BASE_TYPE | PNG_LIBPNG_BUILD_PRIVATE)
   1.485 +#else
   1.486 +#  if defined(PNG_LIBPNG_SPECIALBUILD)
   1.487 +#    define PNG_LIBPNG_BUILD_TYPE \
   1.488 +            (PNG_LIBPNG_BUILD_BASE_TYPE | PNG_LIBPNG_BUILD_SPECIAL)
   1.489 +#  else
   1.490 +#    define PNG_LIBPNG_BUILD_TYPE (PNG_LIBPNG_BUILD_BASE_TYPE)
   1.491 +#  endif
   1.492 +#endif
   1.493 +
   1.494 +#ifndef PNG_VERSION_INFO_ONLY
   1.495 +
   1.496 +/* Inhibit C++ name-mangling for libpng functions but not for system calls. */
   1.497 +#ifdef __cplusplus
   1.498 +extern "C" {
   1.499 +#endif /* __cplusplus */
   1.500 +
   1.501 +/* This file is arranged in several sections.  The first section contains
   1.502 + * structure and type definitions.  The second section contains the external
   1.503 + * library functions, while the third has the internal library functions,
   1.504 + * which applications aren't expected to use directly.
   1.505 + */
   1.506 +
   1.507 +#ifndef PNG_NO_TYPECAST_NULL
   1.508 +#define int_p_NULL                (int *)NULL
   1.509 +#define png_bytep_NULL            (png_bytep)NULL
   1.510 +#define png_bytepp_NULL           (png_bytepp)NULL
   1.511 +#define png_doublep_NULL          (png_doublep)NULL
   1.512 +#define png_error_ptr_NULL        (png_error_ptr)NULL
   1.513 +#define png_flush_ptr_NULL        (png_flush_ptr)NULL
   1.514 +#define png_free_ptr_NULL         (png_free_ptr)NULL
   1.515 +#define png_infopp_NULL           (png_infopp)NULL
   1.516 +#define png_malloc_ptr_NULL       (png_malloc_ptr)NULL
   1.517 +#define png_read_status_ptr_NULL  (png_read_status_ptr)NULL
   1.518 +#define png_rw_ptr_NULL           (png_rw_ptr)NULL
   1.519 +#define png_structp_NULL          (png_structp)NULL
   1.520 +#define png_uint_16p_NULL         (png_uint_16p)NULL
   1.521 +#define png_voidp_NULL            (png_voidp)NULL
   1.522 +#define png_write_status_ptr_NULL (png_write_status_ptr)NULL
   1.523 +#else
   1.524 +#define int_p_NULL                NULL
   1.525 +#define png_bytep_NULL            NULL
   1.526 +#define png_bytepp_NULL           NULL
   1.527 +#define png_doublep_NULL          NULL
   1.528 +#define png_error_ptr_NULL        NULL
   1.529 +#define png_flush_ptr_NULL        NULL
   1.530 +#define png_free_ptr_NULL         NULL
   1.531 +#define png_infopp_NULL           NULL
   1.532 +#define png_malloc_ptr_NULL       NULL
   1.533 +#define png_read_status_ptr_NULL  NULL
   1.534 +#define png_rw_ptr_NULL           NULL
   1.535 +#define png_structp_NULL          NULL
   1.536 +#define png_uint_16p_NULL         NULL
   1.537 +#define png_voidp_NULL            NULL
   1.538 +#define png_write_status_ptr_NULL NULL
   1.539 +#endif
   1.540 +
   1.541 +/* variables declared in png.c - only it needs to define PNG_NO_EXTERN */
   1.542 +#if !defined(PNG_NO_EXTERN) || defined(PNG_ALWAYS_EXTERN)
   1.543 +/* Version information for C files, stored in png.c.  This had better match
   1.544 + * the version above.
   1.545 + */
   1.546 +#ifdef PNG_USE_GLOBAL_ARRAYS
   1.547 +PNG_EXPORT_VAR (PNG_CONST char) png_libpng_ver[18];
   1.548 +  /* need room for 99.99.99beta99z */
   1.549 +#else
   1.550 +#define png_libpng_ver png_get_header_ver(NULL)
   1.551 +#endif
   1.552 +
   1.553 +#ifdef PNG_USE_GLOBAL_ARRAYS
   1.554 +/* This was removed in version 1.0.5c */
   1.555 +/* Structures to facilitate easy interlacing.  See png.c for more details */
   1.556 +PNG_EXPORT_VAR (PNG_CONST int FARDATA) png_pass_start[7];
   1.557 +PNG_EXPORT_VAR (PNG_CONST int FARDATA) png_pass_inc[7];
   1.558 +PNG_EXPORT_VAR (PNG_CONST int FARDATA) png_pass_ystart[7];
   1.559 +PNG_EXPORT_VAR (PNG_CONST int FARDATA) png_pass_yinc[7];
   1.560 +PNG_EXPORT_VAR (PNG_CONST int FARDATA) png_pass_mask[7];
   1.561 +PNG_EXPORT_VAR (PNG_CONST int FARDATA) png_pass_dsp_mask[7];
   1.562 +/* This isn't currently used.  If you need it, see png.c for more details.
   1.563 +PNG_EXPORT_VAR (PNG_CONST int FARDATA) png_pass_height[7];
   1.564 +*/
   1.565 +#endif
   1.566 +
   1.567 +#endif /* PNG_NO_EXTERN */
   1.568 +
   1.569 +/* Three color definitions.  The order of the red, green, and blue, (and the
   1.570 + * exact size) is not important, although the size of the fields need to
   1.571 + * be png_byte or png_uint_16 (as defined below).
   1.572 + */
   1.573 +typedef struct png_color_struct
   1.574 +{
   1.575 +   png_byte red;
   1.576 +   png_byte green;
   1.577 +   png_byte blue;
   1.578 +} png_color;
   1.579 +typedef png_color FAR * png_colorp;
   1.580 +typedef png_color FAR * FAR * png_colorpp;
   1.581 +
   1.582 +typedef struct png_color_16_struct
   1.583 +{
   1.584 +   png_byte index;    /* used for palette files */
   1.585 +   png_uint_16 red;   /* for use in red green blue files */
   1.586 +   png_uint_16 green;
   1.587 +   png_uint_16 blue;
   1.588 +   png_uint_16 gray;  /* for use in grayscale files */
   1.589 +} png_color_16;
   1.590 +typedef png_color_16 FAR * png_color_16p;
   1.591 +typedef png_color_16 FAR * FAR * png_color_16pp;
   1.592 +
   1.593 +typedef struct png_color_8_struct
   1.594 +{
   1.595 +   png_byte red;   /* for use in red green blue files */
   1.596 +   png_byte green;
   1.597 +   png_byte blue;
   1.598 +   png_byte gray;  /* for use in grayscale files */
   1.599 +   png_byte alpha; /* for alpha channel files */
   1.600 +} png_color_8;
   1.601 +typedef png_color_8 FAR * png_color_8p;
   1.602 +typedef png_color_8 FAR * FAR * png_color_8pp;
   1.603 +
   1.604 +/*
   1.605 + * The following two structures are used for the in-core representation
   1.606 + * of sPLT chunks.
   1.607 + */
   1.608 +typedef struct png_sPLT_entry_struct
   1.609 +{
   1.610 +   png_uint_16 red;
   1.611 +   png_uint_16 green;
   1.612 +   png_uint_16 blue;
   1.613 +   png_uint_16 alpha;
   1.614 +   png_uint_16 frequency;
   1.615 +} png_sPLT_entry;
   1.616 +typedef png_sPLT_entry FAR * png_sPLT_entryp;
   1.617 +typedef png_sPLT_entry FAR * FAR * png_sPLT_entrypp;
   1.618 +
   1.619 +/*  When the depth of the sPLT palette is 8 bits, the color and alpha samples
   1.620 + *  occupy the LSB of their respective members, and the MSB of each member
   1.621 + *  is zero-filled.  The frequency member always occupies the full 16 bits.
   1.622 + */
   1.623 +
   1.624 +typedef struct png_sPLT_struct
   1.625 +{
   1.626 +   png_charp name;           /* palette name */
   1.627 +   png_byte depth;           /* depth of palette samples */
   1.628 +   png_sPLT_entryp entries;  /* palette entries */
   1.629 +   png_int_32 nentries;      /* number of palette entries */
   1.630 +} png_sPLT_t;
   1.631 +typedef png_sPLT_t FAR * png_sPLT_tp;
   1.632 +typedef png_sPLT_t FAR * FAR * png_sPLT_tpp;
   1.633 +
   1.634 +#ifdef PNG_TEXT_SUPPORTED
   1.635 +/* png_text holds the contents of a text/ztxt/itxt chunk in a PNG file,
   1.636 + * and whether that contents is compressed or not.  The "key" field
   1.637 + * points to a regular zero-terminated C string.  The "text", "lang", and
   1.638 + * "lang_key" fields can be regular C strings, empty strings, or NULL pointers.
   1.639 + * However, the * structure returned by png_get_text() will always contain
   1.640 + * regular zero-terminated C strings (possibly empty), never NULL pointers,
   1.641 + * so they can be safely used in printf() and other string-handling functions.
   1.642 + */
   1.643 +typedef struct png_text_struct
   1.644 +{
   1.645 +   int  compression;       /* compression value:
   1.646 +                             -1: tEXt, none
   1.647 +                              0: zTXt, deflate
   1.648 +                              1: iTXt, none
   1.649 +                              2: iTXt, deflate  */
   1.650 +   png_charp key;          /* keyword, 1-79 character description of "text" */
   1.651 +   png_charp text;         /* comment, may be an empty string (ie "")
   1.652 +                              or a NULL pointer */
   1.653 +   png_size_t text_length; /* length of the text string */
   1.654 +#ifdef PNG_iTXt_SUPPORTED
   1.655 +   png_size_t itxt_length; /* length of the itxt string */
   1.656 +   png_charp lang;         /* language code, 0-79 characters
   1.657 +                              or a NULL pointer */
   1.658 +   png_charp lang_key;     /* keyword translated UTF-8 string, 0 or more
   1.659 +                              chars or a NULL pointer */
   1.660 +#endif
   1.661 +} png_text;
   1.662 +typedef png_text FAR * png_textp;
   1.663 +typedef png_text FAR * FAR * png_textpp;
   1.664 +#endif
   1.665 +
   1.666 +/* Supported compression types for text in PNG files (tEXt, and zTXt).
   1.667 + * The values of the PNG_TEXT_COMPRESSION_ defines should NOT be changed. */
   1.668 +#define PNG_TEXT_COMPRESSION_NONE_WR -3
   1.669 +#define PNG_TEXT_COMPRESSION_zTXt_WR -2
   1.670 +#define PNG_TEXT_COMPRESSION_NONE    -1
   1.671 +#define PNG_TEXT_COMPRESSION_zTXt     0
   1.672 +#define PNG_ITXT_COMPRESSION_NONE     1
   1.673 +#define PNG_ITXT_COMPRESSION_zTXt     2
   1.674 +#define PNG_TEXT_COMPRESSION_LAST     3  /* Not a valid value */
   1.675 +
   1.676 +/* png_time is a way to hold the time in an machine independent way.
   1.677 + * Two conversions are provided, both from time_t and struct tm.  There
   1.678 + * is no portable way to convert to either of these structures, as far
   1.679 + * as I know.  If you know of a portable way, send it to me.  As a side
   1.680 + * note - PNG has always been Year 2000 compliant!
   1.681 + */
   1.682 +typedef struct png_time_struct
   1.683 +{
   1.684 +   png_uint_16 year; /* full year, as in, 1995 */
   1.685 +   png_byte month;   /* month of year, 1 - 12 */
   1.686 +   png_byte day;     /* day of month, 1 - 31 */
   1.687 +   png_byte hour;    /* hour of day, 0 - 23 */
   1.688 +   png_byte minute;  /* minute of hour, 0 - 59 */
   1.689 +   png_byte second;  /* second of minute, 0 - 60 (for leap seconds) */
   1.690 +} png_time;
   1.691 +typedef png_time FAR * png_timep;
   1.692 +typedef png_time FAR * FAR * png_timepp;
   1.693 +
   1.694 +#if defined(PNG_UNKNOWN_CHUNKS_SUPPORTED)
   1.695 +/* png_unknown_chunk is a structure to hold queued chunks for which there is
   1.696 + * no specific support.  The idea is that we can use this to queue
   1.697 + * up private chunks for output even though the library doesn't actually
   1.698 + * know about their semantics.
   1.699 + */
   1.700 +#define PNG_CHUNK_NAME_LENGTH 5
   1.701 +typedef struct png_unknown_chunk_t
   1.702 +{
   1.703 +    png_byte name[PNG_CHUNK_NAME_LENGTH];
   1.704 +    png_byte *data;
   1.705 +    png_size_t size;
   1.706 +
   1.707 +    /* libpng-using applications should NOT directly modify this byte. */
   1.708 +    png_byte location; /* mode of operation at read time */
   1.709 +}
   1.710 +png_unknown_chunk;
   1.711 +typedef png_unknown_chunk FAR * png_unknown_chunkp;
   1.712 +typedef png_unknown_chunk FAR * FAR * png_unknown_chunkpp;
   1.713 +#endif
   1.714 +
   1.715 +/* png_info is a structure that holds the information in a PNG file so
   1.716 + * that the application can find out the characteristics of the image.
   1.717 + * If you are reading the file, this structure will tell you what is
   1.718 + * in the PNG file.  If you are writing the file, fill in the information
   1.719 + * you want to put into the PNG file, then call png_write_info().
   1.720 + * The names chosen should be very close to the PNG specification, so
   1.721 + * consult that document for information about the meaning of each field.
   1.722 + *
   1.723 + * With libpng < 0.95, it was only possible to directly set and read the
   1.724 + * the values in the png_info_struct, which meant that the contents and
   1.725 + * order of the values had to remain fixed.  With libpng 0.95 and later,
   1.726 + * however, there are now functions that abstract the contents of
   1.727 + * png_info_struct from the application, so this makes it easier to use
   1.728 + * libpng with dynamic libraries, and even makes it possible to use
   1.729 + * libraries that don't have all of the libpng ancillary chunk-handing
   1.730 + * functionality.
   1.731 + *
   1.732 + * In any case, the order of the parameters in png_info_struct should NOT
   1.733 + * be changed for as long as possible to keep compatibility with applications
   1.734 + * that use the old direct-access method with png_info_struct.
   1.735 + *
   1.736 + * The following members may have allocated storage attached that should be
   1.737 + * cleaned up before the structure is discarded: palette, trans, text,
   1.738 + * pcal_purpose, pcal_units, pcal_params, hist, iccp_name, iccp_profile,
   1.739 + * splt_palettes, scal_unit, row_pointers, and unknowns.   By default, these
   1.740 + * are automatically freed when the info structure is deallocated, if they were
   1.741 + * allocated internally by libpng.  This behavior can be changed by means
   1.742 + * of the png_data_freer() function.
   1.743 + *
   1.744 + * More allocation details: all the chunk-reading functions that
   1.745 + * change these members go through the corresponding png_set_*
   1.746 + * functions.  A function to clear these members is available: see
   1.747 + * png_free_data().  The png_set_* functions do not depend on being
   1.748 + * able to point info structure members to any of the storage they are
   1.749 + * passed (they make their own copies), EXCEPT that the png_set_text
   1.750 + * functions use the same storage passed to them in the text_ptr or
   1.751 + * itxt_ptr structure argument, and the png_set_rows and png_set_unknowns
   1.752 + * functions do not make their own copies.
   1.753 + */
   1.754 +typedef struct png_info_struct
   1.755 +{
   1.756 +   /* the following are necessary for every PNG file */
   1.757 +   png_uint_32 width;       /* width of image in pixels (from IHDR) */
   1.758 +   png_uint_32 height;      /* height of image in pixels (from IHDR) */
   1.759 +   png_uint_32 valid;       /* valid chunk data (see PNG_INFO_ below) */
   1.760 +   png_uint_32 rowbytes;    /* bytes needed to hold an untransformed row */
   1.761 +   png_colorp palette;      /* array of color values (valid & PNG_INFO_PLTE) */
   1.762 +   png_uint_16 num_palette; /* number of color entries in "palette" (PLTE) */
   1.763 +   png_uint_16 num_trans;   /* number of transparent palette color (tRNS) */
   1.764 +   png_byte bit_depth;      /* 1, 2, 4, 8, or 16 bits/channel (from IHDR) */
   1.765 +   png_byte color_type;     /* see PNG_COLOR_TYPE_ below (from IHDR) */
   1.766 +   /* The following three should have been named *_method not *_type */
   1.767 +   png_byte compression_type; /* must be PNG_COMPRESSION_TYPE_BASE (IHDR) */
   1.768 +   png_byte filter_type;    /* must be PNG_FILTER_TYPE_BASE (from IHDR) */
   1.769 +   png_byte interlace_type; /* One of PNG_INTERLACE_NONE, PNG_INTERLACE_ADAM7 */
   1.770 +
   1.771 +   /* The following is informational only on read, and not used on writes. */
   1.772 +   png_byte channels;       /* number of data channels per pixel (1, 2, 3, 4) */
   1.773 +   png_byte pixel_depth;    /* number of bits per pixel */
   1.774 +   png_byte spare_byte;     /* to align the data, and for future use */
   1.775 +   png_byte signature[8];   /* magic bytes read by libpng from start of file */
   1.776 +
   1.777 +   /* The rest of the data is optional.  If you are reading, check the
   1.778 +    * valid field to see if the information in these are valid.  If you
   1.779 +    * are writing, set the valid field to those chunks you want written,
   1.780 +    * and initialize the appropriate fields below.
   1.781 +    */
   1.782 +
   1.783 +#if defined(PNG_gAMA_SUPPORTED) && defined(PNG_FLOATING_POINT_SUPPORTED)
   1.784 +   /* The gAMA chunk describes the gamma characteristics of the system
   1.785 +    * on which the image was created, normally in the range [1.0, 2.5].
   1.786 +    * Data is valid if (valid & PNG_INFO_gAMA) is non-zero.
   1.787 +    */
   1.788 +   float gamma; /* gamma value of image, if (valid & PNG_INFO_gAMA) */
   1.789 +#endif
   1.790 +
   1.791 +#if defined(PNG_sRGB_SUPPORTED)
   1.792 +    /* GR-P, 0.96a */
   1.793 +    /* Data valid if (valid & PNG_INFO_sRGB) non-zero. */
   1.794 +   png_byte srgb_intent; /* sRGB rendering intent [0, 1, 2, or 3] */
   1.795 +#endif
   1.796 +
   1.797 +#if defined(PNG_TEXT_SUPPORTED)
   1.798 +   /* The tEXt, and zTXt chunks contain human-readable textual data in
   1.799 +    * uncompressed, compressed, and optionally compressed forms, respectively.
   1.800 +    * The data in "text" is an array of pointers to uncompressed,
   1.801 +    * null-terminated C strings. Each chunk has a keyword that describes the
   1.802 +    * textual data contained in that chunk.  Keywords are not required to be
   1.803 +    * unique, and the text string may be empty.  Any number of text chunks may
   1.804 +    * be in an image.
   1.805 +    */
   1.806 +   int num_text; /* number of comments read/to write */
   1.807 +   int max_text; /* current size of text array */
   1.808 +   png_textp text; /* array of comments read/to write */
   1.809 +#endif /* PNG_TEXT_SUPPORTED */
   1.810 +
   1.811 +#if defined(PNG_tIME_SUPPORTED)
   1.812 +   /* The tIME chunk holds the last time the displayed image data was
   1.813 +    * modified.  See the png_time struct for the contents of this struct.
   1.814 +    */
   1.815 +   png_time mod_time;
   1.816 +#endif
   1.817 +
   1.818 +#if defined(PNG_sBIT_SUPPORTED)
   1.819 +   /* The sBIT chunk specifies the number of significant high-order bits
   1.820 +    * in the pixel data.  Values are in the range [1, bit_depth], and are
   1.821 +    * only specified for the channels in the pixel data.  The contents of
   1.822 +    * the low-order bits is not specified.  Data is valid if
   1.823 +    * (valid & PNG_INFO_sBIT) is non-zero.
   1.824 +    */
   1.825 +   png_color_8 sig_bit; /* significant bits in color channels */
   1.826 +#endif
   1.827 +
   1.828 +#if defined(PNG_tRNS_SUPPORTED) || defined(PNG_READ_EXPAND_SUPPORTED) || \
   1.829 +defined(PNG_READ_BACKGROUND_SUPPORTED)
   1.830 +   /* The tRNS chunk supplies transparency data for paletted images and
   1.831 +    * other image types that don't need a full alpha channel.  There are
   1.832 +    * "num_trans" transparency values for a paletted image, stored in the
   1.833 +    * same order as the palette colors, starting from index 0.  Values
   1.834 +    * for the data are in the range [0, 255], ranging from fully transparent
   1.835 +    * to fully opaque, respectively.  For non-paletted images, there is a
   1.836 +    * single color specified that should be treated as fully transparent.
   1.837 +    * Data is valid if (valid & PNG_INFO_tRNS) is non-zero.
   1.838 +    */
   1.839 +   png_bytep trans; /* transparent values for paletted image */
   1.840 +   png_color_16 trans_values; /* transparent color for non-palette image */
   1.841 +#endif
   1.842 +
   1.843 +#if defined(PNG_bKGD_SUPPORTED) || defined(PNG_READ_BACKGROUND_SUPPORTED)
   1.844 +   /* The bKGD chunk gives the suggested image background color if the
   1.845 +    * display program does not have its own background color and the image
   1.846 +    * is needs to composited onto a background before display.  The colors
   1.847 +    * in "background" are normally in the same color space/depth as the
   1.848 +    * pixel data.  Data is valid if (valid & PNG_INFO_bKGD) is non-zero.
   1.849 +    */
   1.850 +   png_color_16 background;
   1.851 +#endif
   1.852 +
   1.853 +#if defined(PNG_oFFs_SUPPORTED)
   1.854 +   /* The oFFs chunk gives the offset in "offset_unit_type" units rightwards
   1.855 +    * and downwards from the top-left corner of the display, page, or other
   1.856 +    * application-specific co-ordinate space.  See the PNG_OFFSET_ defines
   1.857 +    * below for the unit types.  Valid if (valid & PNG_INFO_oFFs) non-zero.
   1.858 +    */
   1.859 +   png_int_32 x_offset; /* x offset on page */
   1.860 +   png_int_32 y_offset; /* y offset on page */
   1.861 +   png_byte offset_unit_type; /* offset units type */
   1.862 +#endif
   1.863 +
   1.864 +#if defined(PNG_pHYs_SUPPORTED)
   1.865 +   /* The pHYs chunk gives the physical pixel density of the image for
   1.866 +    * display or printing in "phys_unit_type" units (see PNG_RESOLUTION_
   1.867 +    * defines below).  Data is valid if (valid & PNG_INFO_pHYs) is non-zero.
   1.868 +    */
   1.869 +   png_uint_32 x_pixels_per_unit; /* horizontal pixel density */
   1.870 +   png_uint_32 y_pixels_per_unit; /* vertical pixel density */
   1.871 +   png_byte phys_unit_type; /* resolution type (see PNG_RESOLUTION_ below) */
   1.872 +#endif
   1.873 +
   1.874 +#if defined(PNG_hIST_SUPPORTED)
   1.875 +   /* The hIST chunk contains the relative frequency or importance of the
   1.876 +    * various palette entries, so that a viewer can intelligently select a
   1.877 +    * reduced-color palette, if required.  Data is an array of "num_palette"
   1.878 +    * values in the range [0,65535]. Data valid if (valid & PNG_INFO_hIST)
   1.879 +    * is non-zero.
   1.880 +    */
   1.881 +   png_uint_16p hist;
   1.882 +#endif
   1.883 +
   1.884 +#ifdef PNG_cHRM_SUPPORTED
   1.885 +   /* The cHRM chunk describes the CIE color characteristics of the monitor
   1.886 +    * on which the PNG was created.  This data allows the viewer to do gamut
   1.887 +    * mapping of the input image to ensure that the viewer sees the same
   1.888 +    * colors in the image as the creator.  Values are in the range
   1.889 +    * [0.0, 0.8].  Data valid if (valid & PNG_INFO_cHRM) non-zero.
   1.890 +    */
   1.891 +#ifdef PNG_FLOATING_POINT_SUPPORTED
   1.892 +   float x_white;
   1.893 +   float y_white;
   1.894 +   float x_red;
   1.895 +   float y_red;
   1.896 +   float x_green;
   1.897 +   float y_green;
   1.898 +   float x_blue;
   1.899 +   float y_blue;
   1.900 +#endif
   1.901 +#endif
   1.902 +
   1.903 +#if defined(PNG_pCAL_SUPPORTED)
   1.904 +   /* The pCAL chunk describes a transformation between the stored pixel
   1.905 +    * values and original physical data values used to create the image.
   1.906 +    * The integer range [0, 2^bit_depth - 1] maps to the floating-point
   1.907 +    * range given by [pcal_X0, pcal_X1], and are further transformed by a
   1.908 +    * (possibly non-linear) transformation function given by "pcal_type"
   1.909 +    * and "pcal_params" into "pcal_units".  Please see the PNG_EQUATION_
   1.910 +    * defines below, and the PNG-Group's PNG extensions document for a
   1.911 +    * complete description of the transformations and how they should be
   1.912 +    * implemented, and for a description of the ASCII parameter strings.
   1.913 +    * Data values are valid if (valid & PNG_INFO_pCAL) non-zero.
   1.914 +    */
   1.915 +   png_charp pcal_purpose;  /* pCAL chunk description string */
   1.916 +   png_int_32 pcal_X0;      /* minimum value */
   1.917 +   png_int_32 pcal_X1;      /* maximum value */
   1.918 +   png_charp pcal_units;    /* Latin-1 string giving physical units */
   1.919 +   png_charpp pcal_params;  /* ASCII strings containing parameter values */
   1.920 +   png_byte pcal_type;      /* equation type (see PNG_EQUATION_ below) */
   1.921 +   png_byte pcal_nparams;   /* number of parameters given in pcal_params */
   1.922 +#endif
   1.923 +
   1.924 +/* New members added in libpng-1.0.6 */
   1.925 +#ifdef PNG_FREE_ME_SUPPORTED
   1.926 +   png_uint_32 free_me;     /* flags items libpng is responsible for freeing */
   1.927 +#endif
   1.928 +
   1.929 +#if defined(PNG_UNKNOWN_CHUNKS_SUPPORTED)
   1.930 +   /* storage for unknown chunks that the library doesn't recognize. */
   1.931 +   png_unknown_chunkp unknown_chunks;
   1.932 +   png_size_t unknown_chunks_num;
   1.933 +#endif
   1.934 +
   1.935 +#if defined(PNG_iCCP_SUPPORTED)
   1.936 +   /* iCCP chunk data. */
   1.937 +   png_charp iccp_name;     /* profile name */
   1.938 +   png_charp iccp_profile;  /* International Color Consortium profile data */
   1.939 +                            /* Note to maintainer: should be png_bytep */
   1.940 +   png_uint_32 iccp_proflen;  /* ICC profile data length */
   1.941 +   png_byte iccp_compression; /* Always zero */
   1.942 +#endif
   1.943 +
   1.944 +#if defined(PNG_sPLT_SUPPORTED)
   1.945 +   /* data on sPLT chunks (there may be more than one). */
   1.946 +   png_sPLT_tp splt_palettes;
   1.947 +   png_uint_32 splt_palettes_num;
   1.948 +#endif
   1.949 +
   1.950 +#if defined(PNG_sCAL_SUPPORTED)
   1.951 +   /* The sCAL chunk describes the actual physical dimensions of the
   1.952 +    * subject matter of the graphic.  The chunk contains a unit specification
   1.953 +    * a byte value, and two ASCII strings representing floating-point
   1.954 +    * values.  The values are width and height corresponsing to one pixel
   1.955 +    * in the image.  This external representation is converted to double
   1.956 +    * here.  Data values are valid if (valid & PNG_INFO_sCAL) is non-zero.
   1.957 +    */
   1.958 +   png_byte scal_unit;         /* unit of physical scale */
   1.959 +#ifdef PNG_FLOATING_POINT_SUPPORTED
   1.960 +   double scal_pixel_width;    /* width of one pixel */
   1.961 +   double scal_pixel_height;   /* height of one pixel */
   1.962 +#endif
   1.963 +#ifdef PNG_FIXED_POINT_SUPPORTED
   1.964 +   png_charp scal_s_width;     /* string containing height */
   1.965 +   png_charp scal_s_height;    /* string containing width */
   1.966 +#endif
   1.967 +#endif
   1.968 +
   1.969 +#if defined(PNG_INFO_IMAGE_SUPPORTED)
   1.970 +   /* Memory has been allocated if (valid & PNG_ALLOCATED_INFO_ROWS) non-zero */
   1.971 +   /* Data valid if (valid & PNG_INFO_IDAT) non-zero */
   1.972 +   png_bytepp row_pointers;        /* the image bits */
   1.973 +#endif
   1.974 +
   1.975 +#if defined(PNG_FIXED_POINT_SUPPORTED) && defined(PNG_gAMA_SUPPORTED)
   1.976 +   png_fixed_point int_gamma; /* gamma of image, if (valid & PNG_INFO_gAMA) */
   1.977 +#endif
   1.978 +
   1.979 +#if defined(PNG_cHRM_SUPPORTED) && defined(PNG_FIXED_POINT_SUPPORTED)
   1.980 +   png_fixed_point int_x_white;
   1.981 +   png_fixed_point int_y_white;
   1.982 +   png_fixed_point int_x_red;
   1.983 +   png_fixed_point int_y_red;
   1.984 +   png_fixed_point int_x_green;
   1.985 +   png_fixed_point int_y_green;
   1.986 +   png_fixed_point int_x_blue;
   1.987 +   png_fixed_point int_y_blue;
   1.988 +#endif
   1.989 +
   1.990 +} png_info;
   1.991 +
   1.992 +typedef png_info FAR * png_infop;
   1.993 +typedef png_info FAR * FAR * png_infopp;
   1.994 +
   1.995 +/* Maximum positive integer used in PNG is (2^31)-1 */
   1.996 +#define PNG_UINT_31_MAX ((png_uint_32)0x7fffffffL)
   1.997 +#define PNG_UINT_32_MAX ((png_uint_32)(-1))
   1.998 +#define PNG_SIZE_MAX ((png_size_t)(-1))
   1.999 +#if defined(PNG_1_0_X) || defined (PNG_1_2_X)
  1.1000 +/* PNG_MAX_UINT is deprecated; use PNG_UINT_31_MAX instead. */
  1.1001 +#define PNG_MAX_UINT PNG_UINT_31_MAX
  1.1002 +#endif
  1.1003 +
  1.1004 +/* These describe the color_type field in png_info. */
  1.1005 +/* color type masks */
  1.1006 +#define PNG_COLOR_MASK_PALETTE    1
  1.1007 +#define PNG_COLOR_MASK_COLOR      2
  1.1008 +#define PNG_COLOR_MASK_ALPHA      4
  1.1009 +
  1.1010 +/* color types.  Note that not all combinations are legal */
  1.1011 +#define PNG_COLOR_TYPE_GRAY 0
  1.1012 +#define PNG_COLOR_TYPE_PALETTE  (PNG_COLOR_MASK_COLOR | PNG_COLOR_MASK_PALETTE)
  1.1013 +#define PNG_COLOR_TYPE_RGB        (PNG_COLOR_MASK_COLOR)
  1.1014 +#define PNG_COLOR_TYPE_RGB_ALPHA  (PNG_COLOR_MASK_COLOR | PNG_COLOR_MASK_ALPHA)
  1.1015 +#define PNG_COLOR_TYPE_GRAY_ALPHA (PNG_COLOR_MASK_ALPHA)
  1.1016 +/* aliases */
  1.1017 +#define PNG_COLOR_TYPE_RGBA  PNG_COLOR_TYPE_RGB_ALPHA
  1.1018 +#define PNG_COLOR_TYPE_GA  PNG_COLOR_TYPE_GRAY_ALPHA
  1.1019 +
  1.1020 +/* This is for compression type. PNG 1.0-1.2 only define the single type. */
  1.1021 +#define PNG_COMPRESSION_TYPE_BASE 0 /* Deflate method 8, 32K window */
  1.1022 +#define PNG_COMPRESSION_TYPE_DEFAULT PNG_COMPRESSION_TYPE_BASE
  1.1023 +
  1.1024 +/* This is for filter type. PNG 1.0-1.2 only define the single type. */
  1.1025 +#define PNG_FILTER_TYPE_BASE      0 /* Single row per-byte filtering */
  1.1026 +#define PNG_INTRAPIXEL_DIFFERENCING 64 /* Used only in MNG datastreams */
  1.1027 +#define PNG_FILTER_TYPE_DEFAULT   PNG_FILTER_TYPE_BASE
  1.1028 +
  1.1029 +/* These are for the interlacing type.  These values should NOT be changed. */
  1.1030 +#define PNG_INTERLACE_NONE        0 /* Non-interlaced image */
  1.1031 +#define PNG_INTERLACE_ADAM7       1 /* Adam7 interlacing */
  1.1032 +#define PNG_INTERLACE_LAST        2 /* Not a valid value */
  1.1033 +
  1.1034 +/* These are for the oFFs chunk.  These values should NOT be changed. */
  1.1035 +#define PNG_OFFSET_PIXEL          0 /* Offset in pixels */
  1.1036 +#define PNG_OFFSET_MICROMETER     1 /* Offset in micrometers (1/10^6 meter) */
  1.1037 +#define PNG_OFFSET_LAST           2 /* Not a valid value */
  1.1038 +
  1.1039 +/* These are for the pCAL chunk.  These values should NOT be changed. */
  1.1040 +#define PNG_EQUATION_LINEAR       0 /* Linear transformation */
  1.1041 +#define PNG_EQUATION_BASE_E       1 /* Exponential base e transform */
  1.1042 +#define PNG_EQUATION_ARBITRARY    2 /* Arbitrary base exponential transform */
  1.1043 +#define PNG_EQUATION_HYPERBOLIC   3 /* Hyperbolic sine transformation */
  1.1044 +#define PNG_EQUATION_LAST         4 /* Not a valid value */
  1.1045 +
  1.1046 +/* These are for the sCAL chunk.  These values should NOT be changed. */
  1.1047 +#define PNG_SCALE_UNKNOWN         0 /* unknown unit (image scale) */
  1.1048 +#define PNG_SCALE_METER           1 /* meters per pixel */
  1.1049 +#define PNG_SCALE_RADIAN          2 /* radians per pixel */
  1.1050 +#define PNG_SCALE_LAST            3 /* Not a valid value */
  1.1051 +
  1.1052 +/* These are for the pHYs chunk.  These values should NOT be changed. */
  1.1053 +#define PNG_RESOLUTION_UNKNOWN    0 /* pixels/unknown unit (aspect ratio) */
  1.1054 +#define PNG_RESOLUTION_METER      1 /* pixels/meter */
  1.1055 +#define PNG_RESOLUTION_LAST       2 /* Not a valid value */
  1.1056 +
  1.1057 +/* These are for the sRGB chunk.  These values should NOT be changed. */
  1.1058 +#define PNG_sRGB_INTENT_PERCEPTUAL 0
  1.1059 +#define PNG_sRGB_INTENT_RELATIVE   1
  1.1060 +#define PNG_sRGB_INTENT_SATURATION 2
  1.1061 +#define PNG_sRGB_INTENT_ABSOLUTE   3
  1.1062 +#define PNG_sRGB_INTENT_LAST       4 /* Not a valid value */
  1.1063 +
  1.1064 +/* This is for text chunks */
  1.1065 +#define PNG_KEYWORD_MAX_LENGTH     79
  1.1066 +
  1.1067 +/* Maximum number of entries in PLTE/sPLT/tRNS arrays */
  1.1068 +#define PNG_MAX_PALETTE_LENGTH    256
  1.1069 +
  1.1070 +/* These determine if an ancillary chunk's data has been successfully read
  1.1071 + * from the PNG header, or if the application has filled in the corresponding
  1.1072 + * data in the info_struct to be written into the output file.  The values
  1.1073 + * of the PNG_INFO_<chunk> defines should NOT be changed.
  1.1074 + */
  1.1075 +#define PNG_INFO_gAMA 0x0001
  1.1076 +#define PNG_INFO_sBIT 0x0002
  1.1077 +#define PNG_INFO_cHRM 0x0004
  1.1078 +#define PNG_INFO_PLTE 0x0008
  1.1079 +#define PNG_INFO_tRNS 0x0010
  1.1080 +#define PNG_INFO_bKGD 0x0020
  1.1081 +#define PNG_INFO_hIST 0x0040
  1.1082 +#define PNG_INFO_pHYs 0x0080
  1.1083 +#define PNG_INFO_oFFs 0x0100
  1.1084 +#define PNG_INFO_tIME 0x0200
  1.1085 +#define PNG_INFO_pCAL 0x0400
  1.1086 +#define PNG_INFO_sRGB 0x0800   /* GR-P, 0.96a */
  1.1087 +#define PNG_INFO_iCCP 0x1000   /* ESR, 1.0.6 */
  1.1088 +#define PNG_INFO_sPLT 0x2000   /* ESR, 1.0.6 */
  1.1089 +#define PNG_INFO_sCAL 0x4000   /* ESR, 1.0.6 */
  1.1090 +#define PNG_INFO_IDAT 0x8000L  /* ESR, 1.0.6 */
  1.1091 +
  1.1092 +/* This is used for the transformation routines, as some of them
  1.1093 + * change these values for the row.  It also should enable using
  1.1094 + * the routines for other purposes.
  1.1095 + */
  1.1096 +typedef struct png_row_info_struct
  1.1097 +{
  1.1098 +   png_uint_32 width; /* width of row */
  1.1099 +   png_uint_32 rowbytes; /* number of bytes in row */
  1.1100 +   png_byte color_type; /* color type of row */
  1.1101 +   png_byte bit_depth; /* bit depth of row */
  1.1102 +   png_byte channels; /* number of channels (1, 2, 3, or 4) */
  1.1103 +   png_byte pixel_depth; /* bits per pixel (depth * channels) */
  1.1104 +} png_row_info;
  1.1105 +
  1.1106 +typedef png_row_info FAR * png_row_infop;
  1.1107 +typedef png_row_info FAR * FAR * png_row_infopp;
  1.1108 +
  1.1109 +/* These are the function types for the I/O functions and for the functions
  1.1110 + * that allow the user to override the default I/O functions with his or her
  1.1111 + * own.  The png_error_ptr type should match that of user-supplied warning
  1.1112 + * and error functions, while the png_rw_ptr type should match that of the
  1.1113 + * user read/write data functions.
  1.1114 + */
  1.1115 +typedef struct png_struct_def png_struct;
  1.1116 +typedef png_struct FAR * png_structp;
  1.1117 +
  1.1118 +typedef void (PNGAPI *png_error_ptr) PNGARG((png_structp, png_const_charp));
  1.1119 +typedef void (PNGAPI *png_rw_ptr) PNGARG((png_structp, png_bytep, png_size_t));
  1.1120 +typedef void (PNGAPI *png_flush_ptr) PNGARG((png_structp));
  1.1121 +typedef void (PNGAPI *png_read_status_ptr) PNGARG((png_structp, png_uint_32,
  1.1122 +   int));
  1.1123 +typedef void (PNGAPI *png_write_status_ptr) PNGARG((png_structp, png_uint_32,
  1.1124 +   int));
  1.1125 +
  1.1126 +#ifdef PNG_PROGRESSIVE_READ_SUPPORTED
  1.1127 +typedef void (PNGAPI *png_progressive_info_ptr) PNGARG((png_structp, png_infop));
  1.1128 +typedef void (PNGAPI *png_progressive_end_ptr) PNGARG((png_structp, png_infop));
  1.1129 +typedef void (PNGAPI *png_progressive_row_ptr) PNGARG((png_structp, png_bytep,
  1.1130 +   png_uint_32, int));
  1.1131 +#endif
  1.1132 +
  1.1133 +#if defined(PNG_READ_USER_TRANSFORM_SUPPORTED) || \
  1.1134 +    defined(PNG_WRITE_USER_TRANSFORM_SUPPORTED) || \
  1.1135 +    defined(PNG_LEGACY_SUPPORTED)
  1.1136 +typedef void (PNGAPI *png_user_transform_ptr) PNGARG((png_structp,
  1.1137 +    png_row_infop, png_bytep));
  1.1138 +#endif
  1.1139 +
  1.1140 +#if defined(PNG_USER_CHUNKS_SUPPORTED)
  1.1141 +typedef int (PNGAPI *png_user_chunk_ptr) PNGARG((png_structp, png_unknown_chunkp));
  1.1142 +#endif
  1.1143 +#if defined(PNG_UNKNOWN_CHUNKS_SUPPORTED)
  1.1144 +typedef void (PNGAPI *png_unknown_chunk_ptr) PNGARG((png_structp));
  1.1145 +#endif
  1.1146 +
  1.1147 +/* Transform masks for the high-level interface */
  1.1148 +#define PNG_TRANSFORM_IDENTITY       0x0000    /* read and write */
  1.1149 +#define PNG_TRANSFORM_STRIP_16       0x0001    /* read only */
  1.1150 +#define PNG_TRANSFORM_STRIP_ALPHA    0x0002    /* read only */
  1.1151 +#define PNG_TRANSFORM_PACKING        0x0004    /* read and write */
  1.1152 +#define PNG_TRANSFORM_PACKSWAP       0x0008    /* read and write */
  1.1153 +#define PNG_TRANSFORM_EXPAND         0x0010    /* read only */
  1.1154 +#define PNG_TRANSFORM_INVERT_MONO    0x0020    /* read and write */
  1.1155 +#define PNG_TRANSFORM_SHIFT          0x0040    /* read and write */
  1.1156 +#define PNG_TRANSFORM_BGR            0x0080    /* read and write */
  1.1157 +#define PNG_TRANSFORM_SWAP_ALPHA     0x0100    /* read and write */
  1.1158 +#define PNG_TRANSFORM_SWAP_ENDIAN    0x0200    /* read and write */
  1.1159 +#define PNG_TRANSFORM_INVERT_ALPHA   0x0400    /* read and write */
  1.1160 +#define PNG_TRANSFORM_STRIP_FILLER   0x0800    /* WRITE only */
  1.1161 +
  1.1162 +/* Flags for MNG supported features */
  1.1163 +#define PNG_FLAG_MNG_EMPTY_PLTE     0x01
  1.1164 +#define PNG_FLAG_MNG_FILTER_64      0x04
  1.1165 +#define PNG_ALL_MNG_FEATURES        0x05
  1.1166 +
  1.1167 +typedef png_voidp (*png_malloc_ptr) PNGARG((png_structp, png_size_t));
  1.1168 +typedef void (*png_free_ptr) PNGARG((png_structp, png_voidp));
  1.1169 +
  1.1170 +/* The structure that holds the information to read and write PNG files.
  1.1171 + * The only people who need to care about what is inside of this are the
  1.1172 + * people who will be modifying the library for their own special needs.
  1.1173 + * It should NOT be accessed directly by an application, except to store
  1.1174 + * the jmp_buf.
  1.1175 + */
  1.1176 +
  1.1177 +struct png_struct_def
  1.1178 +{
  1.1179 +#ifdef PNG_SETJMP_SUPPORTED
  1.1180 +   jmp_buf jmpbuf;            /* used in png_error */
  1.1181 +#endif
  1.1182 +   png_error_ptr error_fn;    /* function for printing errors and aborting */
  1.1183 +   png_error_ptr warning_fn;  /* function for printing warnings */
  1.1184 +   png_voidp error_ptr;       /* user supplied struct for error functions */
  1.1185 +   png_rw_ptr write_data_fn;  /* function for writing output data */
  1.1186 +   png_rw_ptr read_data_fn;   /* function for reading input data */
  1.1187 +   png_voidp io_ptr;          /* ptr to application struct for I/O functions */
  1.1188 +
  1.1189 +#if defined(PNG_READ_USER_TRANSFORM_SUPPORTED)
  1.1190 +   png_user_transform_ptr read_user_transform_fn; /* user read transform */
  1.1191 +#endif
  1.1192 +
  1.1193 +#if defined(PNG_WRITE_USER_TRANSFORM_SUPPORTED)
  1.1194 +   png_user_transform_ptr write_user_transform_fn; /* user write transform */
  1.1195 +#endif
  1.1196 +
  1.1197 +/* These were added in libpng-1.0.2 */
  1.1198 +#if defined(PNG_USER_TRANSFORM_PTR_SUPPORTED)
  1.1199 +#if defined(PNG_READ_USER_TRANSFORM_SUPPORTED) || \
  1.1200 +    defined(PNG_WRITE_USER_TRANSFORM_SUPPORTED)
  1.1201 +   png_voidp user_transform_ptr; /* user supplied struct for user transform */
  1.1202 +   png_byte user_transform_depth;    /* bit depth of user transformed pixels */
  1.1203 +   png_byte user_transform_channels; /* channels in user transformed pixels */
  1.1204 +#endif
  1.1205 +#endif
  1.1206 +
  1.1207 +   png_uint_32 mode;          /* tells us where we are in the PNG file */
  1.1208 +   png_uint_32 flags;         /* flags indicating various things to libpng */
  1.1209 +   png_uint_32 transformations; /* which transformations to perform */
  1.1210 +
  1.1211 +   z_stream zstream;          /* pointer to decompression structure (below) */
  1.1212 +   png_bytep zbuf;            /* buffer for zlib */
  1.1213 +   png_size_t zbuf_size;      /* size of zbuf */
  1.1214 +   int zlib_level;            /* holds zlib compression level */
  1.1215 +   int zlib_method;           /* holds zlib compression method */
  1.1216 +   int zlib_window_bits;      /* holds zlib compression window bits */
  1.1217 +   int zlib_mem_level;        /* holds zlib compression memory level */
  1.1218 +   int zlib_strategy;         /* holds zlib compression strategy */
  1.1219 +
  1.1220 +   png_uint_32 width;         /* width of image in pixels */
  1.1221 +   png_uint_32 height;        /* height of image in pixels */
  1.1222 +   png_uint_32 num_rows;      /* number of rows in current pass */
  1.1223 +   png_uint_32 usr_width;     /* width of row at start of write */
  1.1224 +   png_uint_32 rowbytes;      /* size of row in bytes */
  1.1225 +   png_uint_32 irowbytes;     /* size of current interlaced row in bytes */
  1.1226 +   png_uint_32 iwidth;        /* width of current interlaced row in pixels */
  1.1227 +   png_uint_32 row_number;    /* current row in interlace pass */
  1.1228 +   png_bytep prev_row;        /* buffer to save previous (unfiltered) row */
  1.1229 +   png_bytep row_buf;         /* buffer to save current (unfiltered) row */
  1.1230 +#ifndef PNG_NO_WRITE_FILTER
  1.1231 +   png_bytep sub_row;         /* buffer to save "sub" row when filtering */
  1.1232 +   png_bytep up_row;          /* buffer to save "up" row when filtering */
  1.1233 +   png_bytep avg_row;         /* buffer to save "avg" row when filtering */
  1.1234 +   png_bytep paeth_row;       /* buffer to save "Paeth" row when filtering */
  1.1235 +#endif
  1.1236 +   png_row_info row_info;     /* used for transformation routines */
  1.1237 +
  1.1238 +   png_uint_32 idat_size;     /* current IDAT size for read */
  1.1239 +   png_uint_32 crc;           /* current chunk CRC value */
  1.1240 +   png_colorp palette;        /* palette from the input file */
  1.1241 +   png_uint_16 num_palette;   /* number of color entries in palette */
  1.1242 +   png_uint_16 num_trans;     /* number of transparency values */
  1.1243 +   png_byte chunk_name[5];    /* null-terminated name of current chunk */
  1.1244 +   png_byte compression;      /* file compression type (always 0) */
  1.1245 +   png_byte filter;           /* file filter type (always 0) */
  1.1246 +   png_byte interlaced;       /* PNG_INTERLACE_NONE, PNG_INTERLACE_ADAM7 */
  1.1247 +   png_byte pass;             /* current interlace pass (0 - 6) */
  1.1248 +   png_byte do_filter;        /* row filter flags (see PNG_FILTER_ below ) */
  1.1249 +   png_byte color_type;       /* color type of file */
  1.1250 +   png_byte bit_depth;        /* bit depth of file */
  1.1251 +   png_byte usr_bit_depth;    /* bit depth of users row */
  1.1252 +   png_byte pixel_depth;      /* number of bits per pixel */
  1.1253 +   png_byte channels;         /* number of channels in file */
  1.1254 +   png_byte usr_channels;     /* channels at start of write */
  1.1255 +   png_byte sig_bytes;        /* magic bytes read/written from start of file */
  1.1256 +
  1.1257 +#if defined(PNG_READ_FILLER_SUPPORTED) || defined(PNG_WRITE_FILLER_SUPPORTED)
  1.1258 +#ifdef PNG_LEGACY_SUPPORTED
  1.1259 +   png_byte filler;           /* filler byte for pixel expansion */
  1.1260 +#else
  1.1261 +   png_uint_16 filler;           /* filler bytes for pixel expansion */
  1.1262 +#endif
  1.1263 +#endif
  1.1264 +
  1.1265 +#if defined(PNG_bKGD_SUPPORTED)
  1.1266 +   png_byte background_gamma_type;
  1.1267 +#  ifdef PNG_FLOATING_POINT_SUPPORTED
  1.1268 +   float background_gamma;
  1.1269 +#  endif
  1.1270 +   png_color_16 background;   /* background color in screen gamma space */
  1.1271 +#if defined(PNG_READ_GAMMA_SUPPORTED)
  1.1272 +   png_color_16 background_1; /* background normalized to gamma 1.0 */
  1.1273 +#endif
  1.1274 +#endif /* PNG_bKGD_SUPPORTED */
  1.1275 +
  1.1276 +#if defined(PNG_WRITE_FLUSH_SUPPORTED)
  1.1277 +   png_flush_ptr output_flush_fn;/* Function for flushing output */
  1.1278 +   png_uint_32 flush_dist;    /* how many rows apart to flush, 0 - no flush */
  1.1279 +   png_uint_32 flush_rows;    /* number of rows written since last flush */
  1.1280 +#endif
  1.1281 +
  1.1282 +#if defined(PNG_READ_GAMMA_SUPPORTED) || defined(PNG_READ_BACKGROUND_SUPPORTED)
  1.1283 +   int gamma_shift;      /* number of "insignificant" bits 16-bit gamma */
  1.1284 +#ifdef PNG_FLOATING_POINT_SUPPORTED
  1.1285 +   float gamma;          /* file gamma value */
  1.1286 +   float screen_gamma;   /* screen gamma value (display_exponent) */
  1.1287 +#endif
  1.1288 +#endif
  1.1289 +
  1.1290 +#if defined(PNG_READ_GAMMA_SUPPORTED) || defined(PNG_READ_BACKGROUND_SUPPORTED)
  1.1291 +   png_bytep gamma_table;     /* gamma table for 8-bit depth files */
  1.1292 +   png_bytep gamma_from_1;    /* converts from 1.0 to screen */
  1.1293 +   png_bytep gamma_to_1;      /* converts from file to 1.0 */
  1.1294 +   png_uint_16pp gamma_16_table; /* gamma table for 16-bit depth files */
  1.1295 +   png_uint_16pp gamma_16_from_1; /* converts from 1.0 to screen */
  1.1296 +   png_uint_16pp gamma_16_to_1; /* converts from file to 1.0 */
  1.1297 +#endif
  1.1298 +
  1.1299 +#if defined(PNG_READ_GAMMA_SUPPORTED) || defined(PNG_sBIT_SUPPORTED)
  1.1300 +   png_color_8 sig_bit;       /* significant bits in each available channel */
  1.1301 +#endif
  1.1302 +
  1.1303 +#if defined(PNG_READ_SHIFT_SUPPORTED) || defined(PNG_WRITE_SHIFT_SUPPORTED)
  1.1304 +   png_color_8 shift;         /* shift for significant bit tranformation */
  1.1305 +#endif
  1.1306 +
  1.1307 +#if defined(PNG_tRNS_SUPPORTED) || defined(PNG_READ_BACKGROUND_SUPPORTED) \
  1.1308 + || defined(PNG_READ_EXPAND_SUPPORTED) || defined(PNG_READ_BACKGROUND_SUPPORTED)
  1.1309 +   png_bytep trans;           /* transparency values for paletted files */
  1.1310 +   png_color_16 trans_values; /* transparency values for non-paletted files */
  1.1311 +#endif
  1.1312 +
  1.1313 +   png_read_status_ptr read_row_fn;   /* called after each row is decoded */
  1.1314 +   png_write_status_ptr write_row_fn; /* called after each row is encoded */
  1.1315 +#ifdef PNG_PROGRESSIVE_READ_SUPPORTED
  1.1316 +   png_progressive_info_ptr info_fn; /* called after header data fully read */
  1.1317 +   png_progressive_row_ptr row_fn;   /* called after each prog. row is decoded */
  1.1318 +   png_progressive_end_ptr end_fn;   /* called after image is complete */
  1.1319 +   png_bytep save_buffer_ptr;        /* current location in save_buffer */
  1.1320 +   png_bytep save_buffer;            /* buffer for previously read data */
  1.1321 +   png_bytep current_buffer_ptr;     /* current location in current_buffer */
  1.1322 +   png_bytep current_buffer;         /* buffer for recently used data */
  1.1323 +   png_uint_32 push_length;          /* size of current input chunk */
  1.1324 +   png_uint_32 skip_length;          /* bytes to skip in input data */
  1.1325 +   png_size_t save_buffer_size;      /* amount of data now in save_buffer */
  1.1326 +   png_size_t save_buffer_max;       /* total size of save_buffer */
  1.1327 +   png_size_t buffer_size;           /* total amount of available input data */
  1.1328 +   png_size_t current_buffer_size;   /* amount of data now in current_buffer */
  1.1329 +   int process_mode;                 /* what push library is currently doing */
  1.1330 +   int cur_palette;                  /* current push library palette index */
  1.1331 +
  1.1332 +#  if defined(PNG_TEXT_SUPPORTED)
  1.1333 +     png_size_t current_text_size;   /* current size of text input data */
  1.1334 +     png_size_t current_text_left;   /* how much text left to read in input */
  1.1335 +     png_charp current_text;         /* current text chunk buffer */
  1.1336 +     png_charp current_text_ptr;     /* current location in current_text */
  1.1337 +#  endif /* PNG_TEXT_SUPPORTED */
  1.1338 +#endif /* PNG_PROGRESSIVE_READ_SUPPORTED */
  1.1339 +
  1.1340 +#if defined(__TURBOC__) && !defined(_Windows) && !defined(__FLAT__)
  1.1341 +/* for the Borland special 64K segment handler */
  1.1342 +   png_bytepp offset_table_ptr;
  1.1343 +   png_bytep offset_table;
  1.1344 +   png_uint_16 offset_table_number;
  1.1345 +   png_uint_16 offset_table_count;
  1.1346 +   png_uint_16 offset_table_count_free;
  1.1347 +#endif
  1.1348 +
  1.1349 +#if defined(PNG_READ_DITHER_SUPPORTED)
  1.1350 +   png_bytep palette_lookup;         /* lookup table for dithering */
  1.1351 +   png_bytep dither_index;           /* index translation for palette files */
  1.1352 +#endif
  1.1353 +
  1.1354 +#if defined(PNG_READ_DITHER_SUPPORTED) || defined(PNG_hIST_SUPPORTED)
  1.1355 +   png_uint_16p hist;                /* histogram */
  1.1356 +#endif
  1.1357 +
  1.1358 +#if defined(PNG_WRITE_WEIGHTED_FILTER_SUPPORTED)
  1.1359 +   png_byte heuristic_method;        /* heuristic for row filter selection */
  1.1360 +   png_byte num_prev_filters;        /* number of weights for previous rows */
  1.1361 +   png_bytep prev_filters;           /* filter type(s) of previous row(s) */
  1.1362 +   png_uint_16p filter_weights;      /* weight(s) for previous line(s) */
  1.1363 +   png_uint_16p inv_filter_weights;  /* 1/weight(s) for previous line(s) */
  1.1364 +   png_uint_16p filter_costs;        /* relative filter calculation cost */
  1.1365 +   png_uint_16p inv_filter_costs;    /* 1/relative filter calculation cost */
  1.1366 +#endif
  1.1367 +
  1.1368 +#if defined(PNG_TIME_RFC1123_SUPPORTED)
  1.1369 +   png_charp time_buffer;            /* String to hold RFC 1123 time text */
  1.1370 +#endif
  1.1371 +
  1.1372 +/* New members added in libpng-1.0.6 */
  1.1373 +
  1.1374 +#ifdef PNG_FREE_ME_SUPPORTED
  1.1375 +   png_uint_32 free_me;       /* flags items libpng is responsible for freeing */
  1.1376 +#endif
  1.1377 +
  1.1378 +#if defined(PNG_USER_CHUNKS_SUPPORTED)
  1.1379 +   png_voidp user_chunk_ptr;
  1.1380 +   png_user_chunk_ptr read_user_chunk_fn; /* user read chunk handler */
  1.1381 +#endif
  1.1382 +
  1.1383 +#if defined(PNG_UNKNOWN_CHUNKS_SUPPORTED)
  1.1384 +   int num_chunk_list;
  1.1385 +   png_bytep chunk_list;
  1.1386 +#endif
  1.1387 +
  1.1388 +/* New members added in libpng-1.0.3 */
  1.1389 +#if defined(PNG_READ_RGB_TO_GRAY_SUPPORTED)
  1.1390 +   png_byte rgb_to_gray_status;
  1.1391 +   /* These were changed from png_byte in libpng-1.0.6 */
  1.1392 +   png_uint_16 rgb_to_gray_red_coeff;
  1.1393 +   png_uint_16 rgb_to_gray_green_coeff;
  1.1394 +   png_uint_16 rgb_to_gray_blue_coeff;
  1.1395 +#endif
  1.1396 +
  1.1397 +/* New member added in libpng-1.0.4 (renamed in 1.0.9) */
  1.1398 +#if defined(PNG_MNG_FEATURES_SUPPORTED) || \
  1.1399 +    defined(PNG_READ_EMPTY_PLTE_SUPPORTED) || \
  1.1400 +    defined(PNG_WRITE_EMPTY_PLTE_SUPPORTED)
  1.1401 +/* changed from png_byte to png_uint_32 at version 1.2.0 */
  1.1402 +#ifdef PNG_1_0_X
  1.1403 +   png_byte mng_features_permitted;
  1.1404 +#else
  1.1405 +   png_uint_32 mng_features_permitted;
  1.1406 +#endif /* PNG_1_0_X */
  1.1407 +#endif
  1.1408 +
  1.1409 +/* New member added in libpng-1.0.7 */
  1.1410 +#if defined(PNG_READ_GAMMA_SUPPORTED) || defined(PNG_READ_BACKGROUND_SUPPORTED)
  1.1411 +   png_fixed_point int_gamma;
  1.1412 +#endif
  1.1413 +
  1.1414 +/* New member added in libpng-1.0.9, ifdef'ed out in 1.0.12, enabled in 1.2.0 */
  1.1415 +#if defined(PNG_MNG_FEATURES_SUPPORTED)
  1.1416 +   png_byte filter_type;
  1.1417 +#endif
  1.1418 +
  1.1419 +#if defined(PNG_1_0_X)
  1.1420 +/* New member added in libpng-1.0.10, ifdef'ed out in 1.2.0 */
  1.1421 +   png_uint_32 row_buf_size;
  1.1422 +#endif
  1.1423 +
  1.1424 +/* New members added in libpng-1.2.0 */
  1.1425 +#if defined(PNG_ASSEMBLER_CODE_SUPPORTED)
  1.1426 +#  if !defined(PNG_1_0_X)
  1.1427 +#    if defined(PNG_MMX_CODE_SUPPORTED)
  1.1428 +   png_byte     mmx_bitdepth_threshold;
  1.1429 +   png_uint_32  mmx_rowbytes_threshold;
  1.1430 +#    endif
  1.1431 +   png_uint_32  asm_flags;
  1.1432 +#  endif
  1.1433 +#endif
  1.1434 +
  1.1435 +/* New members added in libpng-1.0.2 but first enabled by default in 1.2.0 */
  1.1436 +#ifdef PNG_USER_MEM_SUPPORTED
  1.1437 +   png_voidp mem_ptr;                /* user supplied struct for mem functions */
  1.1438 +   png_malloc_ptr malloc_fn;         /* function for allocating memory */
  1.1439 +   png_free_ptr free_fn;             /* function for freeing memory */
  1.1440 +#endif
  1.1441 +
  1.1442 +/* New member added in libpng-1.0.13 and 1.2.0 */
  1.1443 +   png_bytep big_row_buf;         /* buffer to save current (unfiltered) row */
  1.1444 +
  1.1445 +#if defined(PNG_READ_DITHER_SUPPORTED)
  1.1446 +/* The following three members were added at version 1.0.14 and 1.2.4 */
  1.1447 +   png_bytep dither_sort;            /* working sort array */
  1.1448 +   png_bytep index_to_palette;       /* where the original index currently is */
  1.1449 +                                     /* in the palette */
  1.1450 +   png_bytep palette_to_index;       /* which original index points to this */
  1.1451 +                                     /* palette color */
  1.1452 +#endif
  1.1453 +
  1.1454 +/* New members added in libpng-1.0.16 and 1.2.6 */
  1.1455 +   png_byte compression_type;
  1.1456 +
  1.1457 +#ifdef PNG_SET_USER_LIMITS_SUPPORTED
  1.1458 +   png_uint_32 user_width_max;
  1.1459 +   png_uint_32 user_height_max;
  1.1460 +#endif
  1.1461 +
  1.1462 +/* New member added in libpng-1.0.25 and 1.2.17 */
  1.1463 +#if defined(PNG_UNKNOWN_CHUNKS_SUPPORTED)
  1.1464 +   /* storage for unknown chunk that the library doesn't recognize. */
  1.1465 +   png_unknown_chunk unknown_chunk;
  1.1466 +#endif
  1.1467 +
  1.1468 +/* New members added in libpng-1.2.26 */
  1.1469 +  png_uint_32 old_big_row_buf_size, old_prev_row_size;
  1.1470 +
  1.1471 +/* New member added in libpng-1.2.30 */
  1.1472 +  png_charp chunkdata;  /* buffer for reading chunk data */
  1.1473 +
  1.1474 +};
  1.1475 +
  1.1476 +
  1.1477 +/* This triggers a compiler error in png.c, if png.c and png.h
  1.1478 + * do not agree upon the version number.
  1.1479 + */
  1.1480 +typedef png_structp version_1_2_33;
  1.1481 +
  1.1482 +typedef png_struct FAR * FAR * png_structpp;
  1.1483 +
  1.1484 +/* Here are the function definitions most commonly used.  This is not
  1.1485 + * the place to find out how to use libpng.  See libpng.txt for the
  1.1486 + * full explanation, see example.c for the summary.  This just provides
  1.1487 + * a simple one line description of the use of each function.
  1.1488 + */
  1.1489 +
  1.1490 +/* Returns the version number of the library */
  1.1491 +extern PNG_EXPORT(png_uint_32,png_access_version_number) PNGARG((void));
  1.1492 +
  1.1493 +/* Tell lib we have already handled the first <num_bytes> magic bytes.
  1.1494 + * Handling more than 8 bytes from the beginning of the file is an error.
  1.1495 + */
  1.1496 +extern PNG_EXPORT(void,png_set_sig_bytes) PNGARG((png_structp png_ptr,
  1.1497 +   int num_bytes));
  1.1498 +
  1.1499 +/* Check sig[start] through sig[start + num_to_check - 1] to see if it's a
  1.1500 + * PNG file.  Returns zero if the supplied bytes match the 8-byte PNG
  1.1501 + * signature, and non-zero otherwise.  Having num_to_check == 0 or
  1.1502 + * start > 7 will always fail (ie return non-zero).
  1.1503 + */
  1.1504 +extern PNG_EXPORT(int,png_sig_cmp) PNGARG((png_bytep sig, png_size_t start,
  1.1505 +   png_size_t num_to_check));
  1.1506 +
  1.1507 +/* Simple signature checking function.  This is the same as calling
  1.1508 + * png_check_sig(sig, n) := !png_sig_cmp(sig, 0, n).
  1.1509 + */
  1.1510 +extern PNG_EXPORT(int,png_check_sig) PNGARG((png_bytep sig, int num));
  1.1511 +
  1.1512 +/* Allocate and initialize png_ptr struct for reading, and any other memory. */
  1.1513 +extern PNG_EXPORT(png_structp,png_create_read_struct)
  1.1514 +   PNGARG((png_const_charp user_png_ver, png_voidp error_ptr,
  1.1515 +   png_error_ptr error_fn, png_error_ptr warn_fn));
  1.1516 +
  1.1517 +/* Allocate and initialize png_ptr struct for writing, and any other memory */
  1.1518 +extern PNG_EXPORT(png_structp,png_create_write_struct)
  1.1519 +   PNGARG((png_const_charp user_png_ver, png_voidp error_ptr,
  1.1520 +   png_error_ptr error_fn, png_error_ptr warn_fn));
  1.1521 +
  1.1522 +#ifdef PNG_WRITE_SUPPORTED
  1.1523 +extern PNG_EXPORT(png_uint_32,png_get_compression_buffer_size)
  1.1524 +   PNGARG((png_structp png_ptr));
  1.1525 +#endif
  1.1526 +
  1.1527 +#ifdef PNG_WRITE_SUPPORTED
  1.1528 +extern PNG_EXPORT(void,png_set_compression_buffer_size)
  1.1529 +   PNGARG((png_structp png_ptr, png_uint_32 size));
  1.1530 +#endif
  1.1531 +
  1.1532 +/* Reset the compression stream */
  1.1533 +extern PNG_EXPORT(int,png_reset_zstream) PNGARG((png_structp png_ptr));
  1.1534 +
  1.1535 +/* New functions added in libpng-1.0.2 (not enabled by default until 1.2.0) */
  1.1536 +#ifdef PNG_USER_MEM_SUPPORTED
  1.1537 +extern PNG_EXPORT(png_structp,png_create_read_struct_2)
  1.1538 +   PNGARG((png_const_charp user_png_ver, png_voidp error_ptr,
  1.1539 +   png_error_ptr error_fn, png_error_ptr warn_fn, png_voidp mem_ptr,
  1.1540 +   png_malloc_ptr malloc_fn, png_free_ptr free_fn));
  1.1541 +extern PNG_EXPORT(png_structp,png_create_write_struct_2)
  1.1542 +   PNGARG((png_const_charp user_png_ver, png_voidp error_ptr,
  1.1543 +   png_error_ptr error_fn, png_error_ptr warn_fn, png_voidp mem_ptr,
  1.1544 +   png_malloc_ptr malloc_fn, png_free_ptr free_fn));
  1.1545 +#endif
  1.1546 +
  1.1547 +/* Write a PNG chunk - size, type, (optional) data, CRC. */
  1.1548 +extern PNG_EXPORT(void,png_write_chunk) PNGARG((png_structp png_ptr,
  1.1549 +   png_bytep chunk_name, png_bytep data, png_size_t length));
  1.1550 +
  1.1551 +/* Write the start of a PNG chunk - length and chunk name. */
  1.1552 +extern PNG_EXPORT(void,png_write_chunk_start) PNGARG((png_structp png_ptr,
  1.1553 +   png_bytep chunk_name, png_uint_32 length));
  1.1554 +
  1.1555 +/* Write the data of a PNG chunk started with png_write_chunk_start(). */
  1.1556 +extern PNG_EXPORT(void,png_write_chunk_data) PNGARG((png_structp png_ptr,
  1.1557 +   png_bytep data, png_size_t length));
  1.1558 +
  1.1559 +/* Finish a chunk started with png_write_chunk_start() (includes CRC). */
  1.1560 +extern PNG_EXPORT(void,png_write_chunk_end) PNGARG((png_structp png_ptr));
  1.1561 +
  1.1562 +/* Allocate and initialize the info structure */
  1.1563 +extern PNG_EXPORT(png_infop,png_create_info_struct)
  1.1564 +   PNGARG((png_structp png_ptr));
  1.1565 +
  1.1566 +#if defined(PNG_1_0_X) || defined (PNG_1_2_X)
  1.1567 +/* Initialize the info structure (old interface - DEPRECATED) */
  1.1568 +extern PNG_EXPORT(void,png_info_init) PNGARG((png_infop info_ptr));
  1.1569 +#undef png_info_init
  1.1570 +#define png_info_init(info_ptr) png_info_init_3(&info_ptr,\
  1.1571 +    png_sizeof(png_info));
  1.1572 +#endif
  1.1573 +
  1.1574 +extern PNG_EXPORT(void,png_info_init_3) PNGARG((png_infopp info_ptr,
  1.1575 +    png_size_t png_info_struct_size));
  1.1576 +
  1.1577 +/* Writes all the PNG information before the image. */
  1.1578 +extern PNG_EXPORT(void,png_write_info_before_PLTE) PNGARG((png_structp png_ptr,
  1.1579 +   png_infop info_ptr));
  1.1580 +extern PNG_EXPORT(void,png_write_info) PNGARG((png_structp png_ptr,
  1.1581 +   png_infop info_ptr));
  1.1582 +
  1.1583 +#ifndef PNG_NO_SEQUENTIAL_READ_SUPPORTED
  1.1584 +/* read the information before the actual image data. */
  1.1585 +extern PNG_EXPORT(void,png_read_info) PNGARG((png_structp png_ptr,
  1.1586 +   png_infop info_ptr));
  1.1587 +#endif
  1.1588 +
  1.1589 +#if defined(PNG_TIME_RFC1123_SUPPORTED)
  1.1590 +extern PNG_EXPORT(png_charp,png_convert_to_rfc1123)
  1.1591 +   PNGARG((png_structp png_ptr, png_timep ptime));
  1.1592 +#endif
  1.1593 +
  1.1594 +#if !defined(_WIN32_WCE)
  1.1595 +/* "time.h" functions are not supported on WindowsCE */
  1.1596 +#if defined(PNG_WRITE_tIME_SUPPORTED)
  1.1597 +/* convert from a struct tm to png_time */
  1.1598 +extern PNG_EXPORT(void,png_convert_from_struct_tm) PNGARG((png_timep ptime,
  1.1599 +   struct tm FAR * ttime));
  1.1600 +
  1.1601 +/* convert from time_t to png_time.  Uses gmtime() */
  1.1602 +extern PNG_EXPORT(void,png_convert_from_time_t) PNGARG((png_timep ptime,
  1.1603 +   time_t ttime));
  1.1604 +#endif /* PNG_WRITE_tIME_SUPPORTED */
  1.1605 +#endif /* _WIN32_WCE */
  1.1606 +
  1.1607 +#if defined(PNG_READ_EXPAND_SUPPORTED)
  1.1608 +/* Expand data to 24-bit RGB, or 8-bit grayscale, with alpha if available. */
  1.1609 +extern PNG_EXPORT(void,png_set_expand) PNGARG((png_structp png_ptr));
  1.1610 +#if !defined(PNG_1_0_X)
  1.1611 +extern PNG_EXPORT(void,png_set_expand_gray_1_2_4_to_8) PNGARG((png_structp
  1.1612 +  png_ptr));
  1.1613 +#endif
  1.1614 +extern PNG_EXPORT(void,png_set_palette_to_rgb) PNGARG((png_structp png_ptr));
  1.1615 +extern PNG_EXPORT(void,png_set_tRNS_to_alpha) PNGARG((png_structp png_ptr));
  1.1616 +#if defined(PNG_1_0_X) || defined (PNG_1_2_X)
  1.1617 +/* Deprecated */
  1.1618 +extern PNG_EXPORT(void,png_set_gray_1_2_4_to_8) PNGARG((png_structp png_ptr));
  1.1619 +#endif
  1.1620 +#endif
  1.1621 +
  1.1622 +#if defined(PNG_READ_BGR_SUPPORTED) || defined(PNG_WRITE_BGR_SUPPORTED)
  1.1623 +/* Use blue, green, red order for pixels. */
  1.1624 +extern PNG_EXPORT(void,png_set_bgr) PNGARG((png_structp png_ptr));
  1.1625 +#endif
  1.1626 +
  1.1627 +#if defined(PNG_READ_GRAY_TO_RGB_SUPPORTED)
  1.1628 +/* Expand the grayscale to 24-bit RGB if necessary. */
  1.1629 +extern PNG_EXPORT(void,png_set_gray_to_rgb) PNGARG((png_structp png_ptr));
  1.1630 +#endif
  1.1631 +
  1.1632 +#if defined(PNG_READ_RGB_TO_GRAY_SUPPORTED)
  1.1633 +/* Reduce RGB to grayscale. */
  1.1634 +#ifdef PNG_FLOATING_POINT_SUPPORTED
  1.1635 +extern PNG_EXPORT(void,png_set_rgb_to_gray) PNGARG((png_structp png_ptr,
  1.1636 +   int error_action, double red, double green ));
  1.1637 +#endif
  1.1638 +extern PNG_EXPORT(void,png_set_rgb_to_gray_fixed) PNGARG((png_structp png_ptr,
  1.1639 +   int error_action, png_fixed_point red, png_fixed_point green ));
  1.1640 +extern PNG_EXPORT(png_byte,png_get_rgb_to_gray_status) PNGARG((png_structp
  1.1641 +   png_ptr));
  1.1642 +#endif
  1.1643 +
  1.1644 +extern PNG_EXPORT(void,png_build_grayscale_palette) PNGARG((int bit_depth,
  1.1645 +   png_colorp palette));
  1.1646 +
  1.1647 +#if defined(PNG_READ_STRIP_ALPHA_SUPPORTED)
  1.1648 +extern PNG_EXPORT(void,png_set_strip_alpha) PNGARG((png_structp png_ptr));
  1.1649 +#endif
  1.1650 +
  1.1651 +#if defined(PNG_READ_SWAP_ALPHA_SUPPORTED) || \
  1.1652 +    defined(PNG_WRITE_SWAP_ALPHA_SUPPORTED)
  1.1653 +extern PNG_EXPORT(void,png_set_swap_alpha) PNGARG((png_structp png_ptr));
  1.1654 +#endif
  1.1655 +
  1.1656 +#if defined(PNG_READ_INVERT_ALPHA_SUPPORTED) || \
  1.1657 +    defined(PNG_WRITE_INVERT_ALPHA_SUPPORTED)
  1.1658 +extern PNG_EXPORT(void,png_set_invert_alpha) PNGARG((png_structp png_ptr));
  1.1659 +#endif
  1.1660 +
  1.1661 +#if defined(PNG_READ_FILLER_SUPPORTED) || defined(PNG_WRITE_FILLER_SUPPORTED)
  1.1662 +/* Add a filler byte to 8-bit Gray or 24-bit RGB images. */
  1.1663 +extern PNG_EXPORT(void,png_set_filler) PNGARG((png_structp png_ptr,
  1.1664 +   png_uint_32 filler, int flags));
  1.1665 +/* The values of the PNG_FILLER_ defines should NOT be changed */
  1.1666 +#define PNG_FILLER_BEFORE 0
  1.1667 +#define PNG_FILLER_AFTER 1
  1.1668 +/* Add an alpha byte to 8-bit Gray or 24-bit RGB images. */
  1.1669 +#if !defined(PNG_1_0_X)
  1.1670 +extern PNG_EXPORT(void,png_set_add_alpha) PNGARG((png_structp png_ptr,
  1.1671 +   png_uint_32 filler, int flags));
  1.1672 +#endif
  1.1673 +#endif /* PNG_READ_FILLER_SUPPORTED || PNG_WRITE_FILLER_SUPPORTED */
  1.1674 +
  1.1675 +#if defined(PNG_READ_SWAP_SUPPORTED) || defined(PNG_WRITE_SWAP_SUPPORTED)
  1.1676 +/* Swap bytes in 16-bit depth files. */
  1.1677 +extern PNG_EXPORT(void,png_set_swap) PNGARG((png_structp png_ptr));
  1.1678 +#endif
  1.1679 +
  1.1680 +#if defined(PNG_READ_PACK_SUPPORTED) || defined(PNG_WRITE_PACK_SUPPORTED)
  1.1681 +/* Use 1 byte per pixel in 1, 2, or 4-bit depth files. */
  1.1682 +extern PNG_EXPORT(void,png_set_packing) PNGARG((png_structp png_ptr));
  1.1683 +#endif
  1.1684 +
  1.1685 +#if defined(PNG_READ_PACKSWAP_SUPPORTED) || defined(PNG_WRITE_PACKSWAP_SUPPORTED)
  1.1686 +/* Swap packing order of pixels in bytes. */
  1.1687 +extern PNG_EXPORT(void,png_set_packswap) PNGARG((png_structp png_ptr));
  1.1688 +#endif
  1.1689 +
  1.1690 +#if defined(PNG_READ_SHIFT_SUPPORTED) || defined(PNG_WRITE_SHIFT_SUPPORTED)
  1.1691 +/* Converts files to legal bit depths. */
  1.1692 +extern PNG_EXPORT(void,png_set_shift) PNGARG((png_structp png_ptr,
  1.1693 +   png_color_8p true_bits));
  1.1694 +#endif
  1.1695 +
  1.1696 +#if defined(PNG_READ_INTERLACING_SUPPORTED) || \
  1.1697 +    defined(PNG_WRITE_INTERLACING_SUPPORTED)
  1.1698 +/* Have the code handle the interlacing.  Returns the number of passes. */
  1.1699 +extern PNG_EXPORT(int,png_set_interlace_handling) PNGARG((png_structp png_ptr));
  1.1700 +#endif
  1.1701 +
  1.1702 +#if defined(PNG_READ_INVERT_SUPPORTED) || defined(PNG_WRITE_INVERT_SUPPORTED)
  1.1703 +/* Invert monochrome files */
  1.1704 +extern PNG_EXPORT(void,png_set_invert_mono) PNGARG((png_structp png_ptr));
  1.1705 +#endif
  1.1706 +
  1.1707 +#if defined(PNG_READ_BACKGROUND_SUPPORTED)
  1.1708 +/* Handle alpha and tRNS by replacing with a background color. */
  1.1709 +#ifdef PNG_FLOATING_POINT_SUPPORTED
  1.1710 +extern PNG_EXPORT(void,png_set_background) PNGARG((png_structp png_ptr,
  1.1711 +   png_color_16p background_color, int background_gamma_code,
  1.1712 +   int need_expand, double background_gamma));
  1.1713 +#endif
  1.1714 +#define PNG_BACKGROUND_GAMMA_UNKNOWN 0
  1.1715 +#define PNG_BACKGROUND_GAMMA_SCREEN  1
  1.1716 +#define PNG_BACKGROUND_GAMMA_FILE    2
  1.1717 +#define PNG_BACKGROUND_GAMMA_UNIQUE  3
  1.1718 +#endif
  1.1719 +
  1.1720 +#if defined(PNG_READ_16_TO_8_SUPPORTED)
  1.1721 +/* strip the second byte of information from a 16-bit depth file. */
  1.1722 +extern PNG_EXPORT(void,png_set_strip_16) PNGARG((png_structp png_ptr));
  1.1723 +#endif
  1.1724 +
  1.1725 +#if defined(PNG_READ_DITHER_SUPPORTED)
  1.1726 +/* Turn on dithering, and reduce the palette to the number of colors available. */
  1.1727 +extern PNG_EXPORT(void,png_set_dither) PNGARG((png_structp png_ptr,
  1.1728 +   png_colorp palette, int num_palette, int maximum_colors,
  1.1729 +   png_uint_16p histogram, int full_dither));
  1.1730 +#endif
  1.1731 +
  1.1732 +#if defined(PNG_READ_GAMMA_SUPPORTED)
  1.1733 +/* Handle gamma correction. Screen_gamma=(display_exponent) */
  1.1734 +#ifdef PNG_FLOATING_POINT_SUPPORTED
  1.1735 +extern PNG_EXPORT(void,png_set_gamma) PNGARG((png_structp png_ptr,
  1.1736 +   double screen_gamma, double default_file_gamma));
  1.1737 +#endif
  1.1738 +#endif
  1.1739 +
  1.1740 +#if defined(PNG_1_0_X) || defined (PNG_1_2_X)
  1.1741 +#if defined(PNG_READ_EMPTY_PLTE_SUPPORTED) || \
  1.1742 +    defined(PNG_WRITE_EMPTY_PLTE_SUPPORTED)
  1.1743 +/* Permit or disallow empty PLTE (0: not permitted, 1: permitted) */
  1.1744 +/* Deprecated and will be removed.  Use png_permit_mng_features() instead. */
  1.1745 +extern PNG_EXPORT(void,png_permit_empty_plte) PNGARG((png_structp png_ptr,
  1.1746 +   int empty_plte_permitted));
  1.1747 +#endif
  1.1748 +#endif
  1.1749 +
  1.1750 +#if defined(PNG_WRITE_FLUSH_SUPPORTED)
  1.1751 +/* Set how many lines between output flushes - 0 for no flushing */
  1.1752 +extern PNG_EXPORT(void,png_set_flush) PNGARG((png_structp png_ptr, int nrows));
  1.1753 +/* Flush the current PNG output buffer */
  1.1754 +extern PNG_EXPORT(void,png_write_flush) PNGARG((png_structp png_ptr));
  1.1755 +#endif
  1.1756 +
  1.1757 +/* optional update palette with requested transformations */
  1.1758 +extern PNG_EXPORT(void,png_start_read_image) PNGARG((png_structp png_ptr));
  1.1759 +
  1.1760 +/* optional call to update the users info structure */
  1.1761 +extern PNG_EXPORT(void,png_read_update_info) PNGARG((png_structp png_ptr,
  1.1762 +   png_infop info_ptr));
  1.1763 +
  1.1764 +#ifndef PNG_NO_SEQUENTIAL_READ_SUPPORTED
  1.1765 +/* read one or more rows of image data. */
  1.1766 +extern PNG_EXPORT(void,png_read_rows) PNGARG((png_structp png_ptr,
  1.1767 +   png_bytepp row, png_bytepp display_row, png_uint_32 num_rows));
  1.1768 +#endif
  1.1769 +
  1.1770 +#ifndef PNG_NO_SEQUENTIAL_READ_SUPPORTED
  1.1771 +/* read a row of data. */
  1.1772 +extern PNG_EXPORT(void,png_read_row) PNGARG((png_structp png_ptr,
  1.1773 +   png_bytep row,
  1.1774 +   png_bytep display_row));
  1.1775 +#endif
  1.1776 +
  1.1777 +#ifndef PNG_NO_SEQUENTIAL_READ_SUPPORTED
  1.1778 +/* read the whole image into memory at once. */
  1.1779 +extern PNG_EXPORT(void,png_read_image) PNGARG((png_structp png_ptr,
  1.1780 +   png_bytepp image));
  1.1781 +#endif
  1.1782 +
  1.1783 +/* write a row of image data */
  1.1784 +extern PNG_EXPORT(void,png_write_row) PNGARG((png_structp png_ptr,
  1.1785 +   png_bytep row));
  1.1786 +
  1.1787 +/* write a few rows of image data */
  1.1788 +extern PNG_EXPORT(void,png_write_rows) PNGARG((png_structp png_ptr,
  1.1789 +   png_bytepp row, png_uint_32 num_rows));
  1.1790 +
  1.1791 +/* write the image data */
  1.1792 +extern PNG_EXPORT(void,png_write_image) PNGARG((png_structp png_ptr,
  1.1793 +   png_bytepp image));
  1.1794 +
  1.1795 +/* writes the end of the PNG file. */
  1.1796 +extern PNG_EXPORT(void,png_write_end) PNGARG((png_structp png_ptr,
  1.1797 +   png_infop info_ptr));
  1.1798 +
  1.1799 +#ifndef PNG_NO_SEQUENTIAL_READ_SUPPORTED
  1.1800 +/* read the end of the PNG file. */
  1.1801 +extern PNG_EXPORT(void,png_read_end) PNGARG((png_structp png_ptr,
  1.1802 +   png_infop info_ptr));
  1.1803 +#endif
  1.1804 +
  1.1805 +/* free any memory associated with the png_info_struct */
  1.1806 +extern PNG_EXPORT(void,png_destroy_info_struct) PNGARG((png_structp png_ptr,
  1.1807 +   png_infopp info_ptr_ptr));
  1.1808 +
  1.1809 +/* free any memory associated with the png_struct and the png_info_structs */
  1.1810 +extern PNG_EXPORT(void,png_destroy_read_struct) PNGARG((png_structpp
  1.1811 +   png_ptr_ptr, png_infopp info_ptr_ptr, png_infopp end_info_ptr_ptr));
  1.1812 +
  1.1813 +/* free all memory used by the read (old method - NOT DLL EXPORTED) */
  1.1814 +extern void png_read_destroy PNGARG((png_structp png_ptr, png_infop info_ptr,
  1.1815 +   png_infop end_info_ptr));
  1.1816 +
  1.1817 +/* free any memory associated with the png_struct and the png_info_structs */
  1.1818 +extern PNG_EXPORT(void,png_destroy_write_struct)
  1.1819 +   PNGARG((png_structpp png_ptr_ptr, png_infopp info_ptr_ptr));
  1.1820 +
  1.1821 +/* free any memory used in png_ptr struct (old method - NOT DLL EXPORTED) */
  1.1822 +extern void png_write_destroy PNGARG((png_structp png_ptr));
  1.1823 +
  1.1824 +/* set the libpng method of handling chunk CRC errors */
  1.1825 +extern PNG_EXPORT(void,png_set_crc_action) PNGARG((png_structp png_ptr,
  1.1826 +   int crit_action, int ancil_action));
  1.1827 +
  1.1828 +/* Values for png_set_crc_action() to say how to handle CRC errors in
  1.1829 + * ancillary and critical chunks, and whether to use the data contained
  1.1830 + * therein.  Note that it is impossible to "discard" data in a critical
  1.1831 + * chunk.  For versions prior to 0.90, the action was always error/quit,
  1.1832 + * whereas in version 0.90 and later, the action for CRC errors in ancillary
  1.1833 + * chunks is warn/discard.  These values should NOT be changed.
  1.1834 + *
  1.1835 + *      value                       action:critical     action:ancillary
  1.1836 + */
  1.1837 +#define PNG_CRC_DEFAULT       0  /* error/quit          warn/discard data */
  1.1838 +#define PNG_CRC_ERROR_QUIT    1  /* error/quit          error/quit        */
  1.1839 +#define PNG_CRC_WARN_DISCARD  2  /* (INVALID)           warn/discard data */
  1.1840 +#define PNG_CRC_WARN_USE      3  /* warn/use data       warn/use data     */
  1.1841 +#define PNG_CRC_QUIET_USE     4  /* quiet/use data      quiet/use data    */
  1.1842 +#define PNG_CRC_NO_CHANGE     5  /* use current value   use current value */
  1.1843 +
  1.1844 +/* These functions give the user control over the scan-line filtering in
  1.1845 + * libpng and the compression methods used by zlib.  These functions are
  1.1846 + * mainly useful for testing, as the defaults should work with most users.
  1.1847 + * Those users who are tight on memory or want faster performance at the
  1.1848 + * expense of compression can modify them.  See the compression library
  1.1849 + * header file (zlib.h) for an explination of the compression functions.
  1.1850 + */
  1.1851 +
  1.1852 +/* set the filtering method(s) used by libpng.  Currently, the only valid
  1.1853 + * value for "method" is 0.
  1.1854 + */
  1.1855 +extern PNG_EXPORT(void,png_set_filter) PNGARG((png_structp png_ptr, int method,
  1.1856 +   int filters));
  1.1857 +
  1.1858 +/* Flags for png_set_filter() to say which filters to use.  The flags
  1.1859 + * are chosen so that they don't conflict with real filter types
  1.1860 + * below, in case they are supplied instead of the #defined constants.
  1.1861 + * These values should NOT be changed.
  1.1862 + */
  1.1863 +#define PNG_NO_FILTERS     0x00
  1.1864 +#define PNG_FILTER_NONE    0x08
  1.1865 +#define PNG_FILTER_SUB     0x10
  1.1866 +#define PNG_FILTER_UP      0x20
  1.1867 +#define PNG_FILTER_AVG     0x40
  1.1868 +#define PNG_FILTER_PAETH   0x80
  1.1869 +#define PNG_ALL_FILTERS (PNG_FILTER_NONE | PNG_FILTER_SUB | PNG_FILTER_UP | \
  1.1870 +                         PNG_FILTER_AVG | PNG_FILTER_PAETH)
  1.1871 +
  1.1872 +/* Filter values (not flags) - used in pngwrite.c, pngwutil.c for now.
  1.1873 + * These defines should NOT be changed.
  1.1874 + */
  1.1875 +#define PNG_FILTER_VALUE_NONE  0
  1.1876 +#define PNG_FILTER_VALUE_SUB   1
  1.1877 +#define PNG_FILTER_VALUE_UP    2
  1.1878 +#define PNG_FILTER_VALUE_AVG   3
  1.1879 +#define PNG_FILTER_VALUE_PAETH 4
  1.1880 +#define PNG_FILTER_VALUE_LAST  5
  1.1881 +
  1.1882 +#if defined(PNG_WRITE_WEIGHTED_FILTER_SUPPORTED) /* EXPERIMENTAL */
  1.1883 +/* The "heuristic_method" is given by one of the PNG_FILTER_HEURISTIC_
  1.1884 + * defines, either the default (minimum-sum-of-absolute-differences), or
  1.1885 + * the experimental method (weighted-minimum-sum-of-absolute-differences).
  1.1886 + *
  1.1887 + * Weights are factors >= 1.0, indicating how important it is to keep the
  1.1888 + * filter type consistent between rows.  Larger numbers mean the current
  1.1889 + * filter is that many times as likely to be the same as the "num_weights"
  1.1890 + * previous filters.  This is cumulative for each previous row with a weight.
  1.1891 + * There needs to be "num_weights" values in "filter_weights", or it can be
  1.1892 + * NULL if the weights aren't being specified.  Weights have no influence on
  1.1893 + * the selection of the first row filter.  Well chosen weights can (in theory)
  1.1894 + * improve the compression for a given image.
  1.1895 + *
  1.1896 + * Costs are factors >= 1.0 indicating the relative decoding costs of a
  1.1897 + * filter type.  Higher costs indicate more decoding expense, and are
  1.1898 + * therefore less likely to be selected over a filter with lower computational
  1.1899 + * costs.  There needs to be a value in "filter_costs" for each valid filter
  1.1900 + * type (given by PNG_FILTER_VALUE_LAST), or it can be NULL if you aren't
  1.1901 + * setting the costs.  Costs try to improve the speed of decompression without
  1.1902 + * unduly increasing the compressed image size.
  1.1903 + *
  1.1904 + * A negative weight or cost indicates the default value is to be used, and
  1.1905 + * values in the range [0.0, 1.0) indicate the value is to remain unchanged.
  1.1906 + * The default values for both weights and costs are currently 1.0, but may
  1.1907 + * change if good general weighting/cost heuristics can be found.  If both
  1.1908 + * the weights and costs are set to 1.0, this degenerates the WEIGHTED method
  1.1909 + * to the UNWEIGHTED method, but with added encoding time/computation.
  1.1910 + */
  1.1911 +#ifdef PNG_FLOATING_POINT_SUPPORTED
  1.1912 +extern PNG_EXPORT(void,png_set_filter_heuristics) PNGARG((png_structp png_ptr,
  1.1913 +   int heuristic_method, int num_weights, png_doublep filter_weights,
  1.1914 +   png_doublep filter_costs));
  1.1915 +#endif
  1.1916 +#endif /*  PNG_WRITE_WEIGHTED_FILTER_SUPPORTED */
  1.1917 +
  1.1918 +/* Heuristic used for row filter selection.  These defines should NOT be
  1.1919 + * changed.
  1.1920 + */
  1.1921 +#define PNG_FILTER_HEURISTIC_DEFAULT    0  /* Currently "UNWEIGHTED" */
  1.1922 +#define PNG_FILTER_HEURISTIC_UNWEIGHTED 1  /* Used by libpng < 0.95 */
  1.1923 +#define PNG_FILTER_HEURISTIC_WEIGHTED   2  /* Experimental feature */
  1.1924 +#define PNG_FILTER_HEURISTIC_LAST       3  /* Not a valid value */
  1.1925 +
  1.1926 +/* Set the library compression level.  Currently, valid values range from
  1.1927 + * 0 - 9, corresponding directly to the zlib compression levels 0 - 9
  1.1928 + * (0 - no compression, 9 - "maximal" compression).  Note that tests have
  1.1929 + * shown that zlib compression levels 3-6 usually perform as well as level 9
  1.1930 + * for PNG images, and do considerably fewer caclulations.  In the future,
  1.1931 + * these values may not correspond directly to the zlib compression levels.
  1.1932 + */
  1.1933 +extern PNG_EXPORT(void,png_set_compression_level) PNGARG((png_structp png_ptr,
  1.1934 +   int level));
  1.1935 +
  1.1936 +extern PNG_EXPORT(void,png_set_compression_mem_level)
  1.1937 +   PNGARG((png_structp png_ptr, int mem_level));
  1.1938 +
  1.1939 +extern PNG_EXPORT(void,png_set_compression_strategy)
  1.1940 +   PNGARG((png_structp png_ptr, int strategy));
  1.1941 +
  1.1942 +extern PNG_EXPORT(void,png_set_compression_window_bits)
  1.1943 +   PNGARG((png_structp png_ptr, int window_bits));
  1.1944 +
  1.1945 +extern PNG_EXPORT(void,png_set_compression_method) PNGARG((png_structp png_ptr,
  1.1946 +   int method));
  1.1947 +
  1.1948 +/* These next functions are called for input/output, memory, and error
  1.1949 + * handling.  They are in the file pngrio.c, pngwio.c, and pngerror.c,
  1.1950 + * and call standard C I/O routines such as fread(), fwrite(), and
  1.1951 + * fprintf().  These functions can be made to use other I/O routines
  1.1952 + * at run time for those applications that need to handle I/O in a
  1.1953 + * different manner by calling png_set_???_fn().  See libpng.txt for
  1.1954 + * more information.
  1.1955 + */
  1.1956 +
  1.1957 +#if !defined(PNG_NO_STDIO)
  1.1958 +/* Initialize the input/output for the PNG file to the default functions. */
  1.1959 +extern PNG_EXPORT(void,png_init_io) PNGARG((png_structp png_ptr, png_FILE_p fp));
  1.1960 +#endif
  1.1961 +
  1.1962 +/* Replace the (error and abort), and warning functions with user
  1.1963 + * supplied functions.  If no messages are to be printed you must still
  1.1964 + * write and use replacement functions. The replacement error_fn should
  1.1965 + * still do a longjmp to the last setjmp location if you are using this
  1.1966 + * method of error handling.  If error_fn or warning_fn is NULL, the
  1.1967 + * default function will be used.
  1.1968 + */
  1.1969 +
  1.1970 +extern PNG_EXPORT(void,png_set_error_fn) PNGARG((png_structp png_ptr,
  1.1971 +   png_voidp error_ptr, png_error_ptr error_fn, png_error_ptr warning_fn));
  1.1972 +
  1.1973 +/* Return the user pointer associated with the error functions */
  1.1974 +extern PNG_EXPORT(png_voidp,png_get_error_ptr) PNGARG((png_structp png_ptr));
  1.1975 +
  1.1976 +/* Replace the default data output functions with a user supplied one(s).
  1.1977 + * If buffered output is not used, then output_flush_fn can be set to NULL.
  1.1978 + * If PNG_WRITE_FLUSH_SUPPORTED is not defined at libpng compile time
  1.1979 + * output_flush_fn will be ignored (and thus can be NULL).
  1.1980 + */
  1.1981 +extern PNG_EXPORT(void,png_set_write_fn) PNGARG((png_structp png_ptr,
  1.1982 +   png_voidp io_ptr, png_rw_ptr write_data_fn, png_flush_ptr output_flush_fn));
  1.1983 +
  1.1984 +/* Replace the default data input function with a user supplied one. */
  1.1985 +extern PNG_EXPORT(void,png_set_read_fn) PNGARG((png_structp png_ptr,
  1.1986 +   png_voidp io_ptr, png_rw_ptr read_data_fn));
  1.1987 +
  1.1988 +/* Return the user pointer associated with the I/O functions */
  1.1989 +extern PNG_EXPORT(png_voidp,png_get_io_ptr) PNGARG((png_structp png_ptr));
  1.1990 +
  1.1991 +extern PNG_EXPORT(void,png_set_read_status_fn) PNGARG((png_structp png_ptr,
  1.1992 +   png_read_status_ptr read_row_fn));
  1.1993 +
  1.1994 +extern PNG_EXPORT(void,png_set_write_status_fn) PNGARG((png_structp png_ptr,
  1.1995 +   png_write_status_ptr write_row_fn));
  1.1996 +
  1.1997 +#ifdef PNG_USER_MEM_SUPPORTED
  1.1998 +/* Replace the default memory allocation functions with user supplied one(s). */
  1.1999 +extern PNG_EXPORT(void,png_set_mem_fn) PNGARG((png_structp png_ptr,
  1.2000 +   png_voidp mem_ptr, png_malloc_ptr malloc_fn, png_free_ptr free_fn));
  1.2001 +/* Return the user pointer associated with the memory functions */
  1.2002 +extern PNG_EXPORT(png_voidp,png_get_mem_ptr) PNGARG((png_structp png_ptr));
  1.2003 +#endif
  1.2004 +
  1.2005 +#if defined(PNG_READ_USER_TRANSFORM_SUPPORTED) || \
  1.2006 +    defined(PNG_LEGACY_SUPPORTED)
  1.2007 +extern PNG_EXPORT(void,png_set_read_user_transform_fn) PNGARG((png_structp
  1.2008 +   png_ptr, png_user_transform_ptr read_user_transform_fn));
  1.2009 +#endif
  1.2010 +
  1.2011 +#if defined(PNG_WRITE_USER_TRANSFORM_SUPPORTED) || \
  1.2012 +    defined(PNG_LEGACY_SUPPORTED)
  1.2013 +extern PNG_EXPORT(void,png_set_write_user_transform_fn) PNGARG((png_structp
  1.2014 +   png_ptr, png_user_transform_ptr write_user_transform_fn));
  1.2015 +#endif
  1.2016 +
  1.2017 +#if defined(PNG_READ_USER_TRANSFORM_SUPPORTED) || \
  1.2018 +    defined(PNG_WRITE_USER_TRANSFORM_SUPPORTED) || \
  1.2019 +    defined(PNG_LEGACY_SUPPORTED)
  1.2020 +extern PNG_EXPORT(void,png_set_user_transform_info) PNGARG((png_structp
  1.2021 +   png_ptr, png_voidp user_transform_ptr, int user_transform_depth,
  1.2022 +   int user_transform_channels));
  1.2023 +/* Return the user pointer associated with the user transform functions */
  1.2024 +extern PNG_EXPORT(png_voidp,png_get_user_transform_ptr)
  1.2025 +   PNGARG((png_structp png_ptr));
  1.2026 +#endif
  1.2027 +
  1.2028 +#ifdef PNG_USER_CHUNKS_SUPPORTED
  1.2029 +extern PNG_EXPORT(void,png_set_read_user_chunk_fn) PNGARG((png_structp png_ptr,
  1.2030 +   png_voidp user_chunk_ptr, png_user_chunk_ptr read_user_chunk_fn));
  1.2031 +extern PNG_EXPORT(png_voidp,png_get_user_chunk_ptr) PNGARG((png_structp
  1.2032 +   png_ptr));
  1.2033 +#endif
  1.2034 +
  1.2035 +#ifdef PNG_PROGRESSIVE_READ_SUPPORTED
  1.2036 +/* Sets the function callbacks for the push reader, and a pointer to a
  1.2037 + * user-defined structure available to the callback functions.
  1.2038 + */
  1.2039 +extern PNG_EXPORT(void,png_set_progressive_read_fn) PNGARG((png_structp png_ptr,
  1.2040 +   png_voidp progressive_ptr,
  1.2041 +   png_progressive_info_ptr info_fn, png_progressive_row_ptr row_fn,
  1.2042 +   png_progressive_end_ptr end_fn));
  1.2043 +
  1.2044 +/* returns the user pointer associated with the push read functions */
  1.2045 +extern PNG_EXPORT(png_voidp,png_get_progressive_ptr)
  1.2046 +   PNGARG((png_structp png_ptr));
  1.2047 +
  1.2048 +/* function to be called when data becomes available */
  1.2049 +extern PNG_EXPORT(void,png_process_data) PNGARG((png_structp png_ptr,
  1.2050 +   png_infop info_ptr, png_bytep buffer, png_size_t buffer_size));
  1.2051 +
  1.2052 +/* function that combines rows.  Not very much different than the
  1.2053 + * png_combine_row() call.  Is this even used?????
  1.2054 + */
  1.2055 +extern PNG_EXPORT(void,png_progressive_combine_row) PNGARG((png_structp png_ptr,
  1.2056 +   png_bytep old_row, png_bytep new_row));
  1.2057 +#endif /* PNG_PROGRESSIVE_READ_SUPPORTED */
  1.2058 +
  1.2059 +extern PNG_EXPORT(png_voidp,png_malloc) PNGARG((png_structp png_ptr,
  1.2060 +   png_uint_32 size));
  1.2061 +
  1.2062 +#if defined(PNG_1_0_X)
  1.2063 +#  define png_malloc_warn png_malloc
  1.2064 +#else
  1.2065 +/* Added at libpng version 1.2.4 */
  1.2066 +extern PNG_EXPORT(png_voidp,png_malloc_warn) PNGARG((png_structp png_ptr,
  1.2067 +   png_uint_32 size));
  1.2068 +#endif
  1.2069 +
  1.2070 +/* frees a pointer allocated by png_malloc() */
  1.2071 +extern PNG_EXPORT(void,png_free) PNGARG((png_structp png_ptr, png_voidp ptr));
  1.2072 +
  1.2073 +#if defined(PNG_1_0_X)
  1.2074 +/* Function to allocate memory for zlib. */
  1.2075 +extern PNG_EXPORT(voidpf,png_zalloc) PNGARG((voidpf png_ptr, uInt items,
  1.2076 +   uInt size));
  1.2077 +
  1.2078 +/* Function to free memory for zlib */
  1.2079 +extern PNG_EXPORT(void,png_zfree) PNGARG((voidpf png_ptr, voidpf ptr));
  1.2080 +#endif
  1.2081 +
  1.2082 +/* Free data that was allocated internally */
  1.2083 +extern PNG_EXPORT(void,png_free_data) PNGARG((png_structp png_ptr,
  1.2084 +   png_infop info_ptr, png_uint_32 free_me, int num));
  1.2085 +#ifdef PNG_FREE_ME_SUPPORTED
  1.2086 +/* Reassign responsibility for freeing existing data, whether allocated
  1.2087 + * by libpng or by the application */
  1.2088 +extern PNG_EXPORT(void,png_data_freer) PNGARG((png_structp png_ptr,
  1.2089 +   png_infop info_ptr, int freer, png_uint_32 mask));
  1.2090 +#endif
  1.2091 +/* assignments for png_data_freer */
  1.2092 +#define PNG_DESTROY_WILL_FREE_DATA 1
  1.2093 +#define PNG_SET_WILL_FREE_DATA 1
  1.2094 +#define PNG_USER_WILL_FREE_DATA 2
  1.2095 +/* Flags for png_ptr->free_me and info_ptr->free_me */
  1.2096 +#define PNG_FREE_HIST 0x0008
  1.2097 +#define PNG_FREE_ICCP 0x0010
  1.2098 +#define PNG_FREE_SPLT 0x0020
  1.2099 +#define PNG_FREE_ROWS 0x0040
  1.2100 +#define PNG_FREE_PCAL 0x0080
  1.2101 +#define PNG_FREE_SCAL 0x0100
  1.2102 +#define PNG_FREE_UNKN 0x0200
  1.2103 +#define PNG_FREE_LIST 0x0400
  1.2104 +#define PNG_FREE_PLTE 0x1000
  1.2105 +#define PNG_FREE_TRNS 0x2000
  1.2106 +#define PNG_FREE_TEXT 0x4000
  1.2107 +#define PNG_FREE_ALL  0x7fff
  1.2108 +#define PNG_FREE_MUL  0x4220 /* PNG_FREE_SPLT|PNG_FREE_TEXT|PNG_FREE_UNKN */
  1.2109 +
  1.2110 +#ifdef PNG_USER_MEM_SUPPORTED
  1.2111 +extern PNG_EXPORT(png_voidp,png_malloc_default) PNGARG((png_structp png_ptr,
  1.2112 +   png_uint_32 size));
  1.2113 +extern PNG_EXPORT(void,png_free_default) PNGARG((png_structp png_ptr,
  1.2114 +   png_voidp ptr));
  1.2115 +#endif
  1.2116 +
  1.2117 +extern PNG_EXPORT(png_voidp,png_memcpy_check) PNGARG((png_structp png_ptr,
  1.2118 +   png_voidp s1, png_voidp s2, png_uint_32 size));
  1.2119 +
  1.2120 +extern PNG_EXPORT(png_voidp,png_memset_check) PNGARG((png_structp png_ptr,
  1.2121 +   png_voidp s1, int value, png_uint_32 size));
  1.2122 +
  1.2123 +#if defined(USE_FAR_KEYWORD)  /* memory model conversion function */
  1.2124 +extern void *png_far_to_near PNGARG((png_structp png_ptr,png_voidp ptr,
  1.2125 +   int check));
  1.2126 +#endif /* USE_FAR_KEYWORD */
  1.2127 +
  1.2128 +#ifndef PNG_NO_ERROR_TEXT
  1.2129 +/* Fatal error in PNG image of libpng - can't continue */
  1.2130 +extern PNG_EXPORT(void,png_error) PNGARG((png_structp png_ptr,
  1.2131 +   png_const_charp error_message));
  1.2132 +
  1.2133 +/* The same, but the chunk name is prepended to the error string. */
  1.2134 +extern PNG_EXPORT(void,png_chunk_error) PNGARG((png_structp png_ptr,
  1.2135 +   png_const_charp error_message));
  1.2136 +#else
  1.2137 +/* Fatal error in PNG image of libpng - can't continue */
  1.2138 +extern PNG_EXPORT(void,png_err) PNGARG((png_structp png_ptr));
  1.2139 +#endif
  1.2140 +
  1.2141 +#ifndef PNG_NO_WARNINGS
  1.2142 +/* Non-fatal error in libpng.  Can continue, but may have a problem. */
  1.2143 +extern PNG_EXPORT(void,png_warning) PNGARG((png_structp png_ptr,
  1.2144 +   png_const_charp warning_message));
  1.2145 +
  1.2146 +#ifdef PNG_READ_SUPPORTED
  1.2147 +/* Non-fatal error in libpng, chunk name is prepended to message. */
  1.2148 +extern PNG_EXPORT(void,png_chunk_warning) PNGARG((png_structp png_ptr,
  1.2149 +   png_const_charp warning_message));
  1.2150 +#endif /* PNG_READ_SUPPORTED */
  1.2151 +#endif /* PNG_NO_WARNINGS */
  1.2152 +
  1.2153 +/* The png_set_<chunk> functions are for storing values in the png_info_struct.
  1.2154 + * Similarly, the png_get_<chunk> calls are used to read values from the
  1.2155 + * png_info_struct, either storing the parameters in the passed variables, or
  1.2156 + * setting pointers into the png_info_struct where the data is stored.  The
  1.2157 + * png_get_<chunk> functions return a non-zero value if the data was available
  1.2158 + * in info_ptr, or return zero and do not change any of the parameters if the
  1.2159 + * data was not available.
  1.2160 + *
  1.2161 + * These functions should be used instead of directly accessing png_info
  1.2162 + * to avoid problems with future changes in the size and internal layout of
  1.2163 + * png_info_struct.
  1.2164 + */
  1.2165 +/* Returns "flag" if chunk data is valid in info_ptr. */
  1.2166 +extern PNG_EXPORT(png_uint_32,png_get_valid) PNGARG((png_structp png_ptr,
  1.2167 +png_infop info_ptr, png_uint_32 flag));
  1.2168 +
  1.2169 +/* Returns number of bytes needed to hold a transformed row. */
  1.2170 +extern PNG_EXPORT(png_uint_32,png_get_rowbytes) PNGARG((png_structp png_ptr,
  1.2171 +png_infop info_ptr));
  1.2172 +
  1.2173 +#if defined(PNG_INFO_IMAGE_SUPPORTED)
  1.2174 +/* Returns row_pointers, which is an array of pointers to scanlines that was
  1.2175 +returned from png_read_png(). */
  1.2176 +extern PNG_EXPORT(png_bytepp,png_get_rows) PNGARG((png_structp png_ptr,
  1.2177 +png_infop info_ptr));
  1.2178 +/* Set row_pointers, which is an array of pointers to scanlines for use
  1.2179 +by png_write_png(). */
  1.2180 +extern PNG_EXPORT(void,png_set_rows) PNGARG((png_structp png_ptr,
  1.2181 +   png_infop info_ptr, png_bytepp row_pointers));
  1.2182 +#endif
  1.2183 +
  1.2184 +/* Returns number of color channels in image. */
  1.2185 +extern PNG_EXPORT(png_byte,png_get_channels) PNGARG((png_structp png_ptr,
  1.2186 +png_infop info_ptr));
  1.2187 +
  1.2188 +#ifdef PNG_EASY_ACCESS_SUPPORTED
  1.2189 +/* Returns image width in pixels. */
  1.2190 +extern PNG_EXPORT(png_uint_32, png_get_image_width) PNGARG((png_structp
  1.2191 +png_ptr, png_infop info_ptr));
  1.2192 +
  1.2193 +/* Returns image height in pixels. */
  1.2194 +extern PNG_EXPORT(png_uint_32, png_get_image_height) PNGARG((png_structp
  1.2195 +png_ptr, png_infop info_ptr));
  1.2196 +
  1.2197 +/* Returns image bit_depth. */
  1.2198 +extern PNG_EXPORT(png_byte, png_get_bit_depth) PNGARG((png_structp
  1.2199 +png_ptr, png_infop info_ptr));
  1.2200 +
  1.2201 +/* Returns image color_type. */
  1.2202 +extern PNG_EXPORT(png_byte, png_get_color_type) PNGARG((png_structp
  1.2203 +png_ptr, png_infop info_ptr));
  1.2204 +
  1.2205 +/* Returns image filter_type. */
  1.2206 +extern PNG_EXPORT(png_byte, png_get_filter_type) PNGARG((png_structp
  1.2207 +png_ptr, png_infop info_ptr));
  1.2208 +
  1.2209 +/* Returns image interlace_type. */
  1.2210 +extern PNG_EXPORT(png_byte, png_get_interlace_type) PNGARG((png_structp
  1.2211 +png_ptr, png_infop info_ptr));
  1.2212 +
  1.2213 +/* Returns image compression_type. */
  1.2214 +extern PNG_EXPORT(png_byte, png_get_compression_type) PNGARG((png_structp
  1.2215 +png_ptr, png_infop info_ptr));
  1.2216 +
  1.2217 +/* Returns image resolution in pixels per meter, from pHYs chunk data. */
  1.2218 +extern PNG_EXPORT(png_uint_32, png_get_pixels_per_meter) PNGARG((png_structp
  1.2219 +png_ptr, png_infop info_ptr));
  1.2220 +extern PNG_EXPORT(png_uint_32, png_get_x_pixels_per_meter) PNGARG((png_structp
  1.2221 +png_ptr, png_infop info_ptr));
  1.2222 +extern PNG_EXPORT(png_uint_32, png_get_y_pixels_per_meter) PNGARG((png_structp
  1.2223 +png_ptr, png_infop info_ptr));
  1.2224 +
  1.2225 +/* Returns pixel aspect ratio, computed from pHYs chunk data.  */
  1.2226 +#ifdef PNG_FLOATING_POINT_SUPPORTED
  1.2227 +extern PNG_EXPORT(float, png_get_pixel_aspect_ratio) PNGARG((png_structp
  1.2228 +png_ptr, png_infop info_ptr));
  1.2229 +#endif
  1.2230 +
  1.2231 +/* Returns image x, y offset in pixels or microns, from oFFs chunk data. */
  1.2232 +extern PNG_EXPORT(png_int_32, png_get_x_offset_pixels) PNGARG((png_structp
  1.2233 +png_ptr, png_infop info_ptr));
  1.2234 +extern PNG_EXPORT(png_int_32, png_get_y_offset_pixels) PNGARG((png_structp
  1.2235 +png_ptr, png_infop info_ptr));
  1.2236 +extern PNG_EXPORT(png_int_32, png_get_x_offset_microns) PNGARG((png_structp
  1.2237 +png_ptr, png_infop info_ptr));
  1.2238 +extern PNG_EXPORT(png_int_32, png_get_y_offset_microns) PNGARG((png_structp
  1.2239 +png_ptr, png_infop info_ptr));
  1.2240 +
  1.2241 +#endif /* PNG_EASY_ACCESS_SUPPORTED */
  1.2242 +
  1.2243 +/* Returns pointer to signature string read from PNG header */
  1.2244 +extern PNG_EXPORT(png_bytep,png_get_signature) PNGARG((png_structp png_ptr,
  1.2245 +png_infop info_ptr));
  1.2246 +
  1.2247 +#if defined(PNG_bKGD_SUPPORTED)
  1.2248 +extern PNG_EXPORT(png_uint_32,png_get_bKGD) PNGARG((png_structp png_ptr,
  1.2249 +   png_infop info_ptr, png_color_16p *background));
  1.2250 +#endif
  1.2251 +
  1.2252 +#if defined(PNG_bKGD_SUPPORTED)
  1.2253 +extern PNG_EXPORT(void,png_set_bKGD) PNGARG((png_structp png_ptr,
  1.2254 +   png_infop info_ptr, png_color_16p background));
  1.2255 +#endif
  1.2256 +
  1.2257 +#if defined(PNG_cHRM_SUPPORTED)
  1.2258 +#ifdef PNG_FLOATING_POINT_SUPPORTED
  1.2259 +extern PNG_EXPORT(png_uint_32,png_get_cHRM) PNGARG((png_structp png_ptr,
  1.2260 +   png_infop info_ptr, double *white_x, double *white_y, double *red_x,
  1.2261 +   double *red_y, double *green_x, double *green_y, double *blue_x,
  1.2262 +   double *blue_y));
  1.2263 +#endif
  1.2264 +#ifdef PNG_FIXED_POINT_SUPPORTED
  1.2265 +extern PNG_EXPORT(png_uint_32,png_get_cHRM_fixed) PNGARG((png_structp png_ptr,
  1.2266 +   png_infop info_ptr, png_fixed_point *int_white_x, png_fixed_point
  1.2267 +   *int_white_y, png_fixed_point *int_red_x, png_fixed_point *int_red_y,
  1.2268 +   png_fixed_point *int_green_x, png_fixed_point *int_green_y, png_fixed_point
  1.2269 +   *int_blue_x, png_fixed_point *int_blue_y));
  1.2270 +#endif
  1.2271 +#endif
  1.2272 +
  1.2273 +#if defined(PNG_cHRM_SUPPORTED)
  1.2274 +#ifdef PNG_FLOATING_POINT_SUPPORTED
  1.2275 +extern PNG_EXPORT(void,png_set_cHRM) PNGARG((png_structp png_ptr,
  1.2276 +   png_infop info_ptr, double white_x, double white_y, double red_x,
  1.2277 +   double red_y, double green_x, double green_y, double blue_x, double blue_y));
  1.2278 +#endif
  1.2279 +#ifdef PNG_FIXED_POINT_SUPPORTED
  1.2280 +extern PNG_EXPORT(void,png_set_cHRM_fixed) PNGARG((png_structp png_ptr,
  1.2281 +   png_infop info_ptr, png_fixed_point int_white_x, png_fixed_point int_white_y,
  1.2282 +   png_fixed_point int_red_x, png_fixed_point int_red_y, png_fixed_point
  1.2283 +   int_green_x, png_fixed_point int_green_y, png_fixed_point int_blue_x,
  1.2284 +   png_fixed_point int_blue_y));
  1.2285 +#endif
  1.2286 +#endif
  1.2287 +
  1.2288 +#if defined(PNG_gAMA_SUPPORTED)
  1.2289 +#ifdef PNG_FLOATING_POINT_SUPPORTED
  1.2290 +extern PNG_EXPORT(png_uint_32,png_get_gAMA) PNGARG((png_structp png_ptr,
  1.2291 +   png_infop info_ptr, double *file_gamma));
  1.2292 +#endif
  1.2293 +extern PNG_EXPORT(png_uint_32,png_get_gAMA_fixed) PNGARG((png_structp png_ptr,
  1.2294 +   png_infop info_ptr, png_fixed_point *int_file_gamma));
  1.2295 +#endif
  1.2296 +
  1.2297 +#if defined(PNG_gAMA_SUPPORTED)
  1.2298 +#ifdef PNG_FLOATING_POINT_SUPPORTED
  1.2299 +extern PNG_EXPORT(void,png_set_gAMA) PNGARG((png_structp png_ptr,
  1.2300 +   png_infop info_ptr, double file_gamma));
  1.2301 +#endif
  1.2302 +extern PNG_EXPORT(void,png_set_gAMA_fixed) PNGARG((png_structp png_ptr,
  1.2303 +   png_infop info_ptr, png_fixed_point int_file_gamma));
  1.2304 +#endif
  1.2305 +
  1.2306 +#if defined(PNG_hIST_SUPPORTED)
  1.2307 +extern PNG_EXPORT(png_uint_32,png_get_hIST) PNGARG((png_structp png_ptr,
  1.2308 +   png_infop info_ptr, png_uint_16p *hist));
  1.2309 +#endif
  1.2310 +
  1.2311 +#if defined(PNG_hIST_SUPPORTED)
  1.2312 +extern PNG_EXPORT(void,png_set_hIST) PNGARG((png_structp png_ptr,
  1.2313 +   png_infop info_ptr, png_uint_16p hist));
  1.2314 +#endif
  1.2315 +
  1.2316 +extern PNG_EXPORT(png_uint_32,png_get_IHDR) PNGARG((png_structp png_ptr,
  1.2317 +   png_infop info_ptr, png_uint_32 *width, png_uint_32 *height,
  1.2318 +   int *bit_depth, int *color_type, int *interlace_method,
  1.2319 +   int *compression_method, int *filter_method));
  1.2320 +
  1.2321 +extern PNG_EXPORT(void,png_set_IHDR) PNGARG((png_structp png_ptr,
  1.2322 +   png_infop info_ptr, png_uint_32 width, png_uint_32 height, int bit_depth,
  1.2323 +   int color_type, int interlace_method, int compression_method,
  1.2324 +   int filter_method));
  1.2325 +
  1.2326 +#if defined(PNG_oFFs_SUPPORTED)
  1.2327 +extern PNG_EXPORT(png_uint_32,png_get_oFFs) PNGARG((png_structp png_ptr,
  1.2328 +   png_infop info_ptr, png_int_32 *offset_x, png_int_32 *offset_y,
  1.2329 +   int *unit_type));
  1.2330 +#endif
  1.2331 +
  1.2332 +#if defined(PNG_oFFs_SUPPORTED)
  1.2333 +extern PNG_EXPORT(void,png_set_oFFs) PNGARG((png_structp png_ptr,
  1.2334 +   png_infop info_ptr, png_int_32 offset_x, png_int_32 offset_y,
  1.2335 +   int unit_type));
  1.2336 +#endif
  1.2337 +
  1.2338 +#if defined(PNG_pCAL_SUPPORTED)
  1.2339 +extern PNG_EXPORT(png_uint_32,png_get_pCAL) PNGARG((png_structp png_ptr,
  1.2340 +   png_infop info_ptr, png_charp *purpose, png_int_32 *X0, png_int_32 *X1,
  1.2341 +   int *type, int *nparams, png_charp *units, png_charpp *params));
  1.2342 +#endif
  1.2343 +
  1.2344 +#if defined(PNG_pCAL_SUPPORTED)
  1.2345 +extern PNG_EXPORT(void,png_set_pCAL) PNGARG((png_structp png_ptr,
  1.2346 +   png_infop info_ptr, png_charp purpose, png_int_32 X0, png_int_32 X1,
  1.2347 +   int type, int nparams, png_charp units, png_charpp params));
  1.2348 +#endif
  1.2349 +
  1.2350 +#if defined(PNG_pHYs_SUPPORTED)
  1.2351 +extern PNG_EXPORT(png_uint_32,png_get_pHYs) PNGARG((png_structp png_ptr,
  1.2352 +   png_infop info_ptr, png_uint_32 *res_x, png_uint_32 *res_y, int *unit_type));
  1.2353 +#endif
  1.2354 +
  1.2355 +#if defined(PNG_pHYs_SUPPORTED)
  1.2356 +extern PNG_EXPORT(void,png_set_pHYs) PNGARG((png_structp png_ptr,
  1.2357 +   png_infop info_ptr, png_uint_32 res_x, png_uint_32 res_y, int unit_type));
  1.2358 +#endif
  1.2359 +
  1.2360 +extern PNG_EXPORT(png_uint_32,png_get_PLTE) PNGARG((png_structp png_ptr,
  1.2361 +   png_infop info_ptr, png_colorp *palette, int *num_palette));
  1.2362 +
  1.2363 +extern PNG_EXPORT(void,png_set_PLTE) PNGARG((png_structp png_ptr,
  1.2364 +   png_infop info_ptr, png_colorp palette, int num_palette));
  1.2365 +
  1.2366 +#if defined(PNG_sBIT_SUPPORTED)
  1.2367 +extern PNG_EXPORT(png_uint_32,png_get_sBIT) PNGARG((png_structp png_ptr,
  1.2368 +   png_infop info_ptr, png_color_8p *sig_bit));
  1.2369 +#endif
  1.2370 +
  1.2371 +#if defined(PNG_sBIT_SUPPORTED)
  1.2372 +extern PNG_EXPORT(void,png_set_sBIT) PNGARG((png_structp png_ptr,
  1.2373 +   png_infop info_ptr, png_color_8p sig_bit));
  1.2374 +#endif
  1.2375 +
  1.2376 +#if defined(PNG_sRGB_SUPPORTED)
  1.2377 +extern PNG_EXPORT(png_uint_32,png_get_sRGB) PNGARG((png_structp png_ptr,
  1.2378 +   png_infop info_ptr, int *intent));
  1.2379 +#endif
  1.2380 +
  1.2381 +#if defined(PNG_sRGB_SUPPORTED)
  1.2382 +extern PNG_EXPORT(void,png_set_sRGB) PNGARG((png_structp png_ptr,
  1.2383 +   png_infop info_ptr, int intent));
  1.2384 +extern PNG_EXPORT(void,png_set_sRGB_gAMA_and_cHRM) PNGARG((png_structp png_ptr,
  1.2385 +   png_infop info_ptr, int intent));
  1.2386 +#endif
  1.2387 +
  1.2388 +#if defined(PNG_iCCP_SUPPORTED)
  1.2389 +extern PNG_EXPORT(png_uint_32,png_get_iCCP) PNGARG((png_structp png_ptr,
  1.2390 +   png_infop info_ptr, png_charpp name, int *compression_type,
  1.2391 +   png_charpp profile, png_uint_32 *proflen));
  1.2392 +   /* Note to maintainer: profile should be png_bytepp */
  1.2393 +#endif
  1.2394 +
  1.2395 +#if defined(PNG_iCCP_SUPPORTED)
  1.2396 +extern PNG_EXPORT(void,png_set_iCCP) PNGARG((png_structp png_ptr,
  1.2397 +   png_infop info_ptr, png_charp name, int compression_type,
  1.2398 +   png_charp profile, png_uint_32 proflen));
  1.2399 +   /* Note to maintainer: profile should be png_bytep */
  1.2400 +#endif
  1.2401 +
  1.2402 +#if defined(PNG_sPLT_SUPPORTED)
  1.2403 +extern PNG_EXPORT(png_uint_32,png_get_sPLT) PNGARG((png_structp png_ptr,
  1.2404 +   png_infop info_ptr, png_sPLT_tpp entries));
  1.2405 +#endif
  1.2406 +
  1.2407 +#if defined(PNG_sPLT_SUPPORTED)
  1.2408 +extern PNG_EXPORT(void,png_set_sPLT) PNGARG((png_structp png_ptr,
  1.2409 +   png_infop info_ptr, png_sPLT_tp entries, int nentries));
  1.2410 +#endif
  1.2411 +
  1.2412 +#if defined(PNG_TEXT_SUPPORTED)
  1.2413 +/* png_get_text also returns the number of text chunks in *num_text */
  1.2414 +extern PNG_EXPORT(png_uint_32,png_get_text) PNGARG((png_structp png_ptr,
  1.2415 +   png_infop info_ptr, png_textp *text_ptr, int *num_text));
  1.2416 +#endif
  1.2417 +
  1.2418 +/*
  1.2419 + *  Note while png_set_text() will accept a structure whose text,
  1.2420 + *  language, and  translated keywords are NULL pointers, the structure
  1.2421 + *  returned by png_get_text will always contain regular
  1.2422 + *  zero-terminated C strings.  They might be empty strings but
  1.2423 + *  they will never be NULL pointers.
  1.2424 + */
  1.2425 +
  1.2426 +#if defined(PNG_TEXT_SUPPORTED)
  1.2427 +extern PNG_EXPORT(void,png_set_text) PNGARG((png_structp png_ptr,
  1.2428 +   png_infop info_ptr, png_textp text_ptr, int num_text));
  1.2429 +#endif
  1.2430 +
  1.2431 +#if defined(PNG_tIME_SUPPORTED)
  1.2432 +extern PNG_EXPORT(png_uint_32,png_get_tIME) PNGARG((png_structp png_ptr,
  1.2433 +   png_infop info_ptr, png_timep *mod_time));
  1.2434 +#endif
  1.2435 +
  1.2436 +#if defined(PNG_tIME_SUPPORTED)
  1.2437 +extern PNG_EXPORT(void,png_set_tIME) PNGARG((png_structp png_ptr,
  1.2438 +   png_infop info_ptr, png_timep mod_time));
  1.2439 +#endif
  1.2440 +
  1.2441 +#if defined(PNG_tRNS_SUPPORTED)
  1.2442 +extern PNG_EXPORT(png_uint_32,png_get_tRNS) PNGARG((png_structp png_ptr,
  1.2443 +   png_infop info_ptr, png_bytep *trans, int *num_trans,
  1.2444 +   png_color_16p *trans_values));
  1.2445 +#endif
  1.2446 +
  1.2447 +#if defined(PNG_tRNS_SUPPORTED)
  1.2448 +extern PNG_EXPORT(void,png_set_tRNS) PNGARG((png_structp png_ptr,
  1.2449 +   png_infop info_ptr, png_bytep trans, int num_trans,
  1.2450 +   png_color_16p trans_values));
  1.2451 +#endif
  1.2452 +
  1.2453 +#if defined(PNG_tRNS_SUPPORTED)
  1.2454 +#endif
  1.2455 +
  1.2456 +#if defined(PNG_sCAL_SUPPORTED)
  1.2457 +#ifdef PNG_FLOATING_POINT_SUPPORTED
  1.2458 +extern PNG_EXPORT(png_uint_32,png_get_sCAL) PNGARG((png_structp png_ptr,
  1.2459 +   png_infop info_ptr, int *unit, double *width, double *height));
  1.2460 +#else
  1.2461 +#ifdef PNG_FIXED_POINT_SUPPORTED
  1.2462 +extern PNG_EXPORT(png_uint_32,png_get_sCAL_s) PNGARG((png_structp png_ptr,
  1.2463 +   png_infop info_ptr, int *unit, png_charpp swidth, png_charpp sheight));
  1.2464 +#endif
  1.2465 +#endif
  1.2466 +#endif /* PNG_sCAL_SUPPORTED */
  1.2467 +
  1.2468 +#if defined(PNG_sCAL_SUPPORTED)
  1.2469 +#ifdef PNG_FLOATING_POINT_SUPPORTED
  1.2470 +extern PNG_EXPORT(void,png_set_sCAL) PNGARG((png_structp png_ptr,
  1.2471 +   png_infop info_ptr, int unit, double width, double height));
  1.2472 +#else
  1.2473 +#ifdef PNG_FIXED_POINT_SUPPORTED
  1.2474 +extern PNG_EXPORT(void,png_set_sCAL_s) PNGARG((png_structp png_ptr,
  1.2475 +   png_infop info_ptr, int unit, png_charp swidth, png_charp sheight));
  1.2476 +#endif
  1.2477 +#endif
  1.2478 +#endif /* PNG_sCAL_SUPPORTED || PNG_WRITE_sCAL_SUPPORTED */
  1.2479 +
  1.2480 +#if defined(PNG_UNKNOWN_CHUNKS_SUPPORTED)
  1.2481 +/* provide a list of chunks and how they are to be handled, if the built-in
  1.2482 +   handling or default unknown chunk handling is not desired.  Any chunks not
  1.2483 +   listed will be handled in the default manner.  The IHDR and IEND chunks
  1.2484 +   must not be listed.
  1.2485 +      keep = 0: follow default behaviour
  1.2486 +           = 1: do not keep
  1.2487 +           = 2: keep only if safe-to-copy
  1.2488 +           = 3: keep even if unsafe-to-copy
  1.2489 +*/
  1.2490 +extern PNG_EXPORT(void, png_set_keep_unknown_chunks) PNGARG((png_structp
  1.2491 +   png_ptr, int keep, png_bytep chunk_list, int num_chunks));
  1.2492 +extern PNG_EXPORT(void, png_set_unknown_chunks) PNGARG((png_structp png_ptr,
  1.2493 +   png_infop info_ptr, png_unknown_chunkp unknowns, int num_unknowns));
  1.2494 +extern PNG_EXPORT(void, png_set_unknown_chunk_location)
  1.2495 +   PNGARG((png_structp png_ptr, png_infop info_ptr, int chunk, int location));
  1.2496 +extern PNG_EXPORT(png_uint_32,png_get_unknown_chunks) PNGARG((png_structp
  1.2497 +   png_ptr, png_infop info_ptr, png_unknown_chunkpp entries));
  1.2498 +#endif
  1.2499 +#ifdef PNG_HANDLE_AS_UNKNOWN_SUPPORTED
  1.2500 +PNG_EXPORT(int,png_handle_as_unknown) PNGARG((png_structp png_ptr, png_bytep
  1.2501 +   chunk_name));
  1.2502 +#endif
  1.2503 +
  1.2504 +/* Png_free_data() will turn off the "valid" flag for anything it frees.
  1.2505 +   If you need to turn it off for a chunk that your application has freed,
  1.2506 +   you can use png_set_invalid(png_ptr, info_ptr, PNG_INFO_CHNK); */
  1.2507 +extern PNG_EXPORT(void, png_set_invalid) PNGARG((png_structp png_ptr,
  1.2508 +   png_infop info_ptr, int mask));
  1.2509 +
  1.2510 +#if defined(PNG_INFO_IMAGE_SUPPORTED)
  1.2511 +/* The "params" pointer is currently not used and is for future expansion. */
  1.2512 +extern PNG_EXPORT(void, png_read_png) PNGARG((png_structp png_ptr,
  1.2513 +                        png_infop info_ptr,
  1.2514 +                        int transforms,
  1.2515 +                        png_voidp params));
  1.2516 +extern PNG_EXPORT(void, png_write_png) PNGARG((png_structp png_ptr,
  1.2517 +                        png_infop info_ptr,
  1.2518 +                        int transforms,
  1.2519 +                        png_voidp params));
  1.2520 +#endif
  1.2521 +
  1.2522 +/* Define PNG_DEBUG at compile time for debugging information.  Higher
  1.2523 + * numbers for PNG_DEBUG mean more debugging information.  This has
  1.2524 + * only been added since version 0.95 so it is not implemented throughout
  1.2525 + * libpng yet, but more support will be added as needed.
  1.2526 + */
  1.2527 +#ifdef PNG_DEBUG
  1.2528 +#if (PNG_DEBUG > 0)
  1.2529 +#if !defined(PNG_DEBUG_FILE) && defined(_MSC_VER)
  1.2530 +#include <crtdbg.h>
  1.2531 +#if (PNG_DEBUG > 1)
  1.2532 +#define png_debug(l,m)  _RPT0(_CRT_WARN,m)
  1.2533 +#define png_debug1(l,m,p1)  _RPT1(_CRT_WARN,m,p1)
  1.2534 +#define png_debug2(l,m,p1,p2) _RPT2(_CRT_WARN,m,p1,p2)
  1.2535 +#endif
  1.2536 +#else /* PNG_DEBUG_FILE || !_MSC_VER */
  1.2537 +#ifndef PNG_DEBUG_FILE
  1.2538 +#define PNG_DEBUG_FILE stderr
  1.2539 +#endif /* PNG_DEBUG_FILE */
  1.2540 +#if (PNG_DEBUG > 1)
  1.2541 +#define png_debug(l,m) \
  1.2542 +{ \
  1.2543 +     int num_tabs=l; \
  1.2544 +     fprintf(PNG_DEBUG_FILE,"%s"m,(num_tabs==1 ? "\t" : \
  1.2545 +       (num_tabs==2 ? "\t\t":(num_tabs>2 ? "\t\t\t":"")))); \
  1.2546 +}
  1.2547 +#define png_debug1(l,m,p1) \
  1.2548 +{ \
  1.2549 +     int num_tabs=l; \
  1.2550 +     fprintf(PNG_DEBUG_FILE,"%s"m,(num_tabs==1 ? "\t" : \
  1.2551 +       (num_tabs==2 ? "\t\t":(num_tabs>2 ? "\t\t\t":""))),p1); \
  1.2552 +}
  1.2553 +#define png_debug2(l,m,p1,p2) \
  1.2554 +{ \
  1.2555 +     int num_tabs=l; \
  1.2556 +     fprintf(PNG_DEBUG_FILE,"%s"m,(num_tabs==1 ? "\t" : \
  1.2557 +       (num_tabs==2 ? "\t\t":(num_tabs>2 ? "\t\t\t":""))),p1,p2); \
  1.2558 +}
  1.2559 +#endif /* (PNG_DEBUG > 1) */
  1.2560 +#endif /* _MSC_VER */
  1.2561 +#endif /* (PNG_DEBUG > 0) */
  1.2562 +#endif /* PNG_DEBUG */
  1.2563 +#ifndef png_debug
  1.2564 +#define png_debug(l, m)
  1.2565 +#endif
  1.2566 +#ifndef png_debug1
  1.2567 +#define png_debug1(l, m, p1)
  1.2568 +#endif
  1.2569 +#ifndef png_debug2
  1.2570 +#define png_debug2(l, m, p1, p2)
  1.2571 +#endif
  1.2572 +
  1.2573 +extern PNG_EXPORT(png_charp,png_get_copyright) PNGARG((png_structp png_ptr));
  1.2574 +extern PNG_EXPORT(png_charp,png_get_header_ver) PNGARG((png_structp png_ptr));
  1.2575 +extern PNG_EXPORT(png_charp,png_get_header_version) PNGARG((png_structp png_ptr));
  1.2576 +extern PNG_EXPORT(png_charp,png_get_libpng_ver) PNGARG((png_structp png_ptr));
  1.2577 +
  1.2578 +#ifdef PNG_MNG_FEATURES_SUPPORTED
  1.2579 +extern PNG_EXPORT(png_uint_32,png_permit_mng_features) PNGARG((png_structp
  1.2580 +   png_ptr, png_uint_32 mng_features_permitted));
  1.2581 +#endif
  1.2582 +
  1.2583 +/* For use in png_set_keep_unknown, added to version 1.2.6 */
  1.2584 +#define PNG_HANDLE_CHUNK_AS_DEFAULT   0
  1.2585 +#define PNG_HANDLE_CHUNK_NEVER        1
  1.2586 +#define PNG_HANDLE_CHUNK_IF_SAFE      2
  1.2587 +#define PNG_HANDLE_CHUNK_ALWAYS       3
  1.2588 +
  1.2589 +/* Added to version 1.2.0 */
  1.2590 +#if defined(PNG_ASSEMBLER_CODE_SUPPORTED)
  1.2591 +#if defined(PNG_MMX_CODE_SUPPORTED)
  1.2592 +#define PNG_ASM_FLAG_MMX_SUPPORT_COMPILED  0x01  /* not user-settable */
  1.2593 +#define PNG_ASM_FLAG_MMX_SUPPORT_IN_CPU    0x02  /* not user-settable */
  1.2594 +#define PNG_ASM_FLAG_MMX_READ_COMBINE_ROW  0x04
  1.2595 +#define PNG_ASM_FLAG_MMX_READ_INTERLACE    0x08
  1.2596 +#define PNG_ASM_FLAG_MMX_READ_FILTER_SUB   0x10
  1.2597 +#define PNG_ASM_FLAG_MMX_READ_FILTER_UP    0x20
  1.2598 +#define PNG_ASM_FLAG_MMX_READ_FILTER_AVG   0x40
  1.2599 +#define PNG_ASM_FLAG_MMX_READ_FILTER_PAETH 0x80
  1.2600 +#define PNG_ASM_FLAGS_INITIALIZED          0x80000000  /* not user-settable */
  1.2601 +
  1.2602 +#define PNG_MMX_READ_FLAGS ( PNG_ASM_FLAG_MMX_READ_COMBINE_ROW  \
  1.2603 +                           | PNG_ASM_FLAG_MMX_READ_INTERLACE    \
  1.2604 +                           | PNG_ASM_FLAG_MMX_READ_FILTER_SUB   \
  1.2605 +                           | PNG_ASM_FLAG_MMX_READ_FILTER_UP    \
  1.2606 +                           | PNG_ASM_FLAG_MMX_READ_FILTER_AVG   \
  1.2607 +                           | PNG_ASM_FLAG_MMX_READ_FILTER_PAETH )
  1.2608 +#define PNG_MMX_WRITE_FLAGS ( 0 )
  1.2609 +
  1.2610 +#define PNG_MMX_FLAGS ( PNG_ASM_FLAG_MMX_SUPPORT_COMPILED \
  1.2611 +                      | PNG_ASM_FLAG_MMX_SUPPORT_IN_CPU   \
  1.2612 +                      | PNG_MMX_READ_FLAGS                \
  1.2613 +                      | PNG_MMX_WRITE_FLAGS )
  1.2614 +
  1.2615 +#define PNG_SELECT_READ   1
  1.2616 +#define PNG_SELECT_WRITE  2
  1.2617 +#endif /* PNG_MMX_CODE_SUPPORTED */
  1.2618 +
  1.2619 +#if !defined(PNG_1_0_X)
  1.2620 +/* pngget.c */
  1.2621 +extern PNG_EXPORT(png_uint_32,png_get_mmx_flagmask)
  1.2622 +   PNGARG((int flag_select, int *compilerID));
  1.2623 +
  1.2624 +/* pngget.c */
  1.2625 +extern PNG_EXPORT(png_uint_32,png_get_asm_flagmask)
  1.2626 +   PNGARG((int flag_select));
  1.2627 +
  1.2628 +/* pngget.c */
  1.2629 +extern PNG_EXPORT(png_uint_32,png_get_asm_flags)
  1.2630 +   PNGARG((png_structp png_ptr));
  1.2631 +
  1.2632 +/* pngget.c */
  1.2633 +extern PNG_EXPORT(png_byte,png_get_mmx_bitdepth_threshold)
  1.2634 +   PNGARG((png_structp png_ptr));
  1.2635 +
  1.2636 +/* pngget.c */
  1.2637 +extern PNG_EXPORT(png_uint_32,png_get_mmx_rowbytes_threshold)
  1.2638 +   PNGARG((png_structp png_ptr));
  1.2639 +
  1.2640 +/* pngset.c */
  1.2641 +extern PNG_EXPORT(void,png_set_asm_flags)
  1.2642 +   PNGARG((png_structp png_ptr, png_uint_32 asm_flags));
  1.2643 +
  1.2644 +/* pngset.c */
  1.2645 +extern PNG_EXPORT(void,png_set_mmx_thresholds)
  1.2646 +   PNGARG((png_structp png_ptr, png_byte mmx_bitdepth_threshold,
  1.2647 +   png_uint_32 mmx_rowbytes_threshold));
  1.2648 +
  1.2649 +#endif /* PNG_1_0_X */
  1.2650 +
  1.2651 +#if !defined(PNG_1_0_X)
  1.2652 +/* png.c, pnggccrd.c, or pngvcrd.c */
  1.2653 +extern PNG_EXPORT(int,png_mmx_support) PNGARG((void));
  1.2654 +#endif /* PNG_ASSEMBLER_CODE_SUPPORTED */
  1.2655 +
  1.2656 +/* Strip the prepended error numbers ("#nnn ") from error and warning
  1.2657 + * messages before passing them to the error or warning handler. */
  1.2658 +#ifdef PNG_ERROR_NUMBERS_SUPPORTED
  1.2659 +extern PNG_EXPORT(void,png_set_strip_error_numbers) PNGARG((png_structp
  1.2660 +   png_ptr, png_uint_32 strip_mode));
  1.2661 +#endif
  1.2662 +
  1.2663 +#endif /* PNG_1_0_X */
  1.2664 +
  1.2665 +/* Added at libpng-1.2.6 */
  1.2666 +#ifdef PNG_SET_USER_LIMITS_SUPPORTED
  1.2667 +extern PNG_EXPORT(void,png_set_user_limits) PNGARG((png_structp
  1.2668 +   png_ptr, png_uint_32 user_width_max, png_uint_32 user_height_max));
  1.2669 +extern PNG_EXPORT(png_uint_32,png_get_user_width_max) PNGARG((png_structp
  1.2670 +   png_ptr));
  1.2671 +extern PNG_EXPORT(png_uint_32,png_get_user_height_max) PNGARG((png_structp
  1.2672 +   png_ptr));
  1.2673 +#endif
  1.2674 +
  1.2675 +
  1.2676 +/* Maintainer: Put new public prototypes here ^, in libpng.3, and project defs */
  1.2677 +
  1.2678 +#ifdef PNG_READ_COMPOSITE_NODIV_SUPPORTED
  1.2679 +/* With these routines we avoid an integer divide, which will be slower on
  1.2680 + * most machines.  However, it does take more operations than the corresponding
  1.2681 + * divide method, so it may be slower on a few RISC systems.  There are two
  1.2682 + * shifts (by 8 or 16 bits) and an addition, versus a single integer divide.
  1.2683 + *
  1.2684 + * Note that the rounding factors are NOT supposed to be the same!  128 and
  1.2685 + * 32768 are correct for the NODIV code; 127 and 32767 are correct for the
  1.2686 + * standard method.
  1.2687 + *
  1.2688 + * [Optimized code by Greg Roelofs and Mark Adler...blame us for bugs. :-) ]
  1.2689 + */
  1.2690 +
  1.2691 + /* fg and bg should be in `gamma 1.0' space; alpha is the opacity          */
  1.2692 +
  1.2693 +#  define png_composite(composite, fg, alpha, bg)                            \
  1.2694 +     { png_uint_16 temp = (png_uint_16)((png_uint_16)(fg) * (png_uint_16)(alpha) \
  1.2695 +                        +        (png_uint_16)(bg)*(png_uint_16)(255 -       \
  1.2696 +                        (png_uint_16)(alpha)) + (png_uint_16)128);           \
  1.2697 +       (composite) = (png_byte)((temp + (temp >> 8)) >> 8); }
  1.2698 +
  1.2699 +#  define png_composite_16(composite, fg, alpha, bg)                         \
  1.2700 +     { png_uint_32 temp = (png_uint_32)((png_uint_32)(fg) * (png_uint_32)(alpha) \
  1.2701 +                        + (png_uint_32)(bg)*(png_uint_32)(65535L -           \
  1.2702 +                        (png_uint_32)(alpha)) + (png_uint_32)32768L);        \
  1.2703 +       (composite) = (png_uint_16)((temp + (temp >> 16)) >> 16); }
  1.2704 +
  1.2705 +#else  /* standard method using integer division */
  1.2706 +
  1.2707 +#  define png_composite(composite, fg, alpha, bg)                            \
  1.2708 +     (composite) = (png_byte)(((png_uint_16)(fg) * (png_uint_16)(alpha) +    \
  1.2709 +       (png_uint_16)(bg) * (png_uint_16)(255 - (png_uint_16)(alpha)) +       \
  1.2710 +       (png_uint_16)127) / 255)
  1.2711 +
  1.2712 +#  define png_composite_16(composite, fg, alpha, bg)                         \
  1.2713 +     (composite) = (png_uint_16)(((png_uint_32)(fg) * (png_uint_32)(alpha) + \
  1.2714 +       (png_uint_32)(bg)*(png_uint_32)(65535L - (png_uint_32)(alpha)) +      \
  1.2715 +       (png_uint_32)32767) / (png_uint_32)65535L)
  1.2716 +
  1.2717 +#endif /* PNG_READ_COMPOSITE_NODIV_SUPPORTED */
  1.2718 +
  1.2719 +/* Inline macros to do direct reads of bytes from the input buffer.  These
  1.2720 + * require that you are using an architecture that uses PNG byte ordering
  1.2721 + * (MSB first) and supports unaligned data storage.  I think that PowerPC
  1.2722 + * in big-endian mode and 680x0 are the only ones that will support this.
  1.2723 + * The x86 line of processors definitely do not.  The png_get_int_32()
  1.2724 + * routine also assumes we are using two's complement format for negative
  1.2725 + * values, which is almost certainly true.
  1.2726 + */
  1.2727 +#if defined(PNG_READ_BIG_ENDIAN_SUPPORTED)
  1.2728 +#  define png_get_uint_32(buf) ( *((png_uint_32p) (buf)))
  1.2729 +#  define png_get_uint_16(buf) ( *((png_uint_16p) (buf)))
  1.2730 +#  define png_get_int_32(buf)  ( *((png_int_32p)  (buf)))
  1.2731 +#else
  1.2732 +extern PNG_EXPORT(png_uint_32,png_get_uint_32) PNGARG((png_bytep buf));
  1.2733 +extern PNG_EXPORT(png_uint_16,png_get_uint_16) PNGARG((png_bytep buf));
  1.2734 +extern PNG_EXPORT(png_int_32,png_get_int_32) PNGARG((png_bytep buf));
  1.2735 +#endif /* !PNG_READ_BIG_ENDIAN_SUPPORTED */
  1.2736 +extern PNG_EXPORT(png_uint_32,png_get_uint_31)
  1.2737 +  PNGARG((png_structp png_ptr, png_bytep buf));
  1.2738 +/* No png_get_int_16 -- may be added if there's a real need for it. */
  1.2739 +
  1.2740 +/* Place a 32-bit number into a buffer in PNG byte order (big-endian).
  1.2741 + */
  1.2742 +extern PNG_EXPORT(void,png_save_uint_32)
  1.2743 +   PNGARG((png_bytep buf, png_uint_32 i));
  1.2744 +extern PNG_EXPORT(void,png_save_int_32)
  1.2745 +   PNGARG((png_bytep buf, png_int_32 i));
  1.2746 +
  1.2747 +/* Place a 16-bit number into a buffer in PNG byte order.
  1.2748 + * The parameter is declared unsigned int, not png_uint_16,
  1.2749 + * just to avoid potential problems on pre-ANSI C compilers.
  1.2750 + */
  1.2751 +extern PNG_EXPORT(void,png_save_uint_16)
  1.2752 +   PNGARG((png_bytep buf, unsigned int i));
  1.2753 +/* No png_save_int_16 -- may be added if there's a real need for it. */
  1.2754 +
  1.2755 +/* ************************************************************************* */
  1.2756 +
  1.2757 +/* These next functions are used internally in the code.  They generally
  1.2758 + * shouldn't be used unless you are writing code to add or replace some
  1.2759 + * functionality in libpng.  More information about most functions can
  1.2760 + * be found in the files where the functions are located.
  1.2761 + */
  1.2762 +
  1.2763 +
  1.2764 +/* Various modes of operation, that are visible to applications because
  1.2765 + * they are used for unknown chunk location.
  1.2766 + */
  1.2767 +#define PNG_HAVE_IHDR               0x01
  1.2768 +#define PNG_HAVE_PLTE               0x02
  1.2769 +#define PNG_HAVE_IDAT               0x04
  1.2770 +#define PNG_AFTER_IDAT              0x08 /* Have complete zlib datastream */
  1.2771 +#define PNG_HAVE_IEND               0x10
  1.2772 +
  1.2773 +#if defined(PNG_INTERNAL)
  1.2774 +
  1.2775 +/* More modes of operation.  Note that after an init, mode is set to
  1.2776 + * zero automatically when the structure is created.
  1.2777 + */
  1.2778 +#define PNG_HAVE_gAMA               0x20
  1.2779 +#define PNG_HAVE_cHRM               0x40
  1.2780 +#define PNG_HAVE_sRGB               0x80
  1.2781 +#define PNG_HAVE_CHUNK_HEADER      0x100
  1.2782 +#define PNG_WROTE_tIME             0x200
  1.2783 +#define PNG_WROTE_INFO_BEFORE_PLTE 0x400
  1.2784 +#define PNG_BACKGROUND_IS_GRAY     0x800
  1.2785 +#define PNG_HAVE_PNG_SIGNATURE    0x1000
  1.2786 +#define PNG_HAVE_CHUNK_AFTER_IDAT 0x2000 /* Have another chunk after IDAT */
  1.2787 +
  1.2788 +/* flags for the transformations the PNG library does on the image data */
  1.2789 +#define PNG_BGR                0x0001
  1.2790 +#define PNG_INTERLACE          0x0002
  1.2791 +#define PNG_PACK               0x0004
  1.2792 +#define PNG_SHIFT              0x0008
  1.2793 +#define PNG_SWAP_BYTES         0x0010
  1.2794 +#define PNG_INVERT_MONO        0x0020
  1.2795 +#define PNG_DITHER             0x0040
  1.2796 +#define PNG_BACKGROUND         0x0080
  1.2797 +#define PNG_BACKGROUND_EXPAND  0x0100
  1.2798 +                          /*   0x0200 unused */
  1.2799 +#define PNG_16_TO_8            0x0400
  1.2800 +#define PNG_RGBA               0x0800
  1.2801 +#define PNG_EXPAND             0x1000
  1.2802 +#define PNG_GAMMA              0x2000
  1.2803 +#define PNG_GRAY_TO_RGB        0x4000
  1.2804 +#define PNG_FILLER             0x8000L
  1.2805 +#define PNG_PACKSWAP          0x10000L
  1.2806 +#define PNG_SWAP_ALPHA        0x20000L
  1.2807 +#define PNG_STRIP_ALPHA       0x40000L
  1.2808 +#define PNG_INVERT_ALPHA      0x80000L
  1.2809 +#define PNG_USER_TRANSFORM   0x100000L
  1.2810 +#define PNG_RGB_TO_GRAY_ERR  0x200000L
  1.2811 +#define PNG_RGB_TO_GRAY_WARN 0x400000L
  1.2812 +#define PNG_RGB_TO_GRAY      0x600000L  /* two bits, RGB_TO_GRAY_ERR|WARN */
  1.2813 +                       /*    0x800000L     Unused */
  1.2814 +#define PNG_ADD_ALPHA       0x1000000L  /* Added to libpng-1.2.7 */
  1.2815 +#define PNG_EXPAND_tRNS     0x2000000L  /* Added to libpng-1.2.9 */
  1.2816 +                       /*   0x4000000L  unused */
  1.2817 +                       /*   0x8000000L  unused */
  1.2818 +                       /*  0x10000000L  unused */
  1.2819 +                       /*  0x20000000L  unused */
  1.2820 +                       /*  0x40000000L  unused */
  1.2821 +
  1.2822 +/* flags for png_create_struct */
  1.2823 +#define PNG_STRUCT_PNG   0x0001
  1.2824 +#define PNG_STRUCT_INFO  0x0002
  1.2825 +
  1.2826 +/* Scaling factor for filter heuristic weighting calculations */
  1.2827 +#define PNG_WEIGHT_SHIFT 8
  1.2828 +#define PNG_WEIGHT_FACTOR (1<<(PNG_WEIGHT_SHIFT))
  1.2829 +#define PNG_COST_SHIFT 3
  1.2830 +#define PNG_COST_FACTOR (1<<(PNG_COST_SHIFT))
  1.2831 +
  1.2832 +/* flags for the png_ptr->flags rather than declaring a byte for each one */
  1.2833 +#define PNG_FLAG_ZLIB_CUSTOM_STRATEGY     0x0001
  1.2834 +#define PNG_FLAG_ZLIB_CUSTOM_LEVEL        0x0002
  1.2835 +#define PNG_FLAG_ZLIB_CUSTOM_MEM_LEVEL    0x0004
  1.2836 +#define PNG_FLAG_ZLIB_CUSTOM_WINDOW_BITS  0x0008
  1.2837 +#define PNG_FLAG_ZLIB_CUSTOM_METHOD       0x0010
  1.2838 +#define PNG_FLAG_ZLIB_FINISHED            0x0020
  1.2839 +#define PNG_FLAG_ROW_INIT                 0x0040
  1.2840 +#define PNG_FLAG_FILLER_AFTER             0x0080
  1.2841 +#define PNG_FLAG_CRC_ANCILLARY_USE        0x0100
  1.2842 +#define PNG_FLAG_CRC_ANCILLARY_NOWARN     0x0200
  1.2843 +#define PNG_FLAG_CRC_CRITICAL_USE         0x0400
  1.2844 +#define PNG_FLAG_CRC_CRITICAL_IGNORE      0x0800
  1.2845 +#define PNG_FLAG_FREE_PLTE                0x1000
  1.2846 +#define PNG_FLAG_FREE_TRNS                0x2000
  1.2847 +#define PNG_FLAG_FREE_HIST                0x4000
  1.2848 +#define PNG_FLAG_KEEP_UNKNOWN_CHUNKS      0x8000L
  1.2849 +#define PNG_FLAG_KEEP_UNSAFE_CHUNKS       0x10000L
  1.2850 +#define PNG_FLAG_LIBRARY_MISMATCH         0x20000L
  1.2851 +#define PNG_FLAG_STRIP_ERROR_NUMBERS      0x40000L
  1.2852 +#define PNG_FLAG_STRIP_ERROR_TEXT         0x80000L
  1.2853 +#define PNG_FLAG_MALLOC_NULL_MEM_OK       0x100000L
  1.2854 +#define PNG_FLAG_ADD_ALPHA                0x200000L  /* Added to libpng-1.2.8 */
  1.2855 +#define PNG_FLAG_STRIP_ALPHA              0x400000L  /* Added to libpng-1.2.8 */
  1.2856 +                                  /*      0x800000L  unused */
  1.2857 +                                  /*     0x1000000L  unused */
  1.2858 +                                  /*     0x2000000L  unused */
  1.2859 +                                  /*     0x4000000L  unused */
  1.2860 +                                  /*     0x8000000L  unused */
  1.2861 +                                  /*    0x10000000L  unused */
  1.2862 +                                  /*    0x20000000L  unused */
  1.2863 +                                  /*    0x40000000L  unused */
  1.2864 +
  1.2865 +#define PNG_FLAG_CRC_ANCILLARY_MASK (PNG_FLAG_CRC_ANCILLARY_USE | \
  1.2866 +                                     PNG_FLAG_CRC_ANCILLARY_NOWARN)
  1.2867 +
  1.2868 +#define PNG_FLAG_CRC_CRITICAL_MASK  (PNG_FLAG_CRC_CRITICAL_USE | \
  1.2869 +                                     PNG_FLAG_CRC_CRITICAL_IGNORE)
  1.2870 +
  1.2871 +#define PNG_FLAG_CRC_MASK           (PNG_FLAG_CRC_ANCILLARY_MASK | \
  1.2872 +                                     PNG_FLAG_CRC_CRITICAL_MASK)
  1.2873 +
  1.2874 +/* save typing and make code easier to understand */
  1.2875 +
  1.2876 +#define PNG_COLOR_DIST(c1, c2) (abs((int)((c1).red) - (int)((c2).red)) + \
  1.2877 +   abs((int)((c1).green) - (int)((c2).green)) + \
  1.2878 +   abs((int)((c1).blue) - (int)((c2).blue)))
  1.2879 +
  1.2880 +/* Added to libpng-1.2.6 JB */
  1.2881 +#define PNG_ROWBYTES(pixel_bits, width) \
  1.2882 +    ((pixel_bits) >= 8 ? \
  1.2883 +    ((width) * (((png_uint_32)(pixel_bits)) >> 3)) : \
  1.2884 +    (( ((width) * ((png_uint_32)(pixel_bits))) + 7) >> 3) )
  1.2885 +
  1.2886 +/* PNG_OUT_OF_RANGE returns true if value is outside the range
  1.2887 +   ideal-delta..ideal+delta.  Each argument is evaluated twice.
  1.2888 +   "ideal" and "delta" should be constants, normally simple
  1.2889 +   integers, "value" a variable. Added to libpng-1.2.6 JB */
  1.2890 +#define PNG_OUT_OF_RANGE(value, ideal, delta) \
  1.2891 +        ( (value) < (ideal)-(delta) || (value) > (ideal)+(delta) )
  1.2892 +
  1.2893 +/* variables declared in png.c - only it needs to define PNG_NO_EXTERN */
  1.2894 +#if !defined(PNG_NO_EXTERN) || defined(PNG_ALWAYS_EXTERN)
  1.2895 +/* place to hold the signature string for a PNG file. */
  1.2896 +#ifdef PNG_USE_GLOBAL_ARRAYS
  1.2897 +   PNG_EXPORT_VAR (PNG_CONST png_byte FARDATA) png_sig[8];
  1.2898 +#else
  1.2899 +#endif
  1.2900 +#endif /* PNG_NO_EXTERN */
  1.2901 +
  1.2902 +/* Constant strings for known chunk types.  If you need to add a chunk,
  1.2903 + * define the name here, and add an invocation of the macro in png.c and
  1.2904 + * wherever it's needed.
  1.2905 + */
  1.2906 +#define PNG_IHDR png_byte png_IHDR[5] = { 73,  72,  68,  82, '\0'}
  1.2907 +#define PNG_IDAT png_byte png_IDAT[5] = { 73,  68,  65,  84, '\0'}
  1.2908 +#define PNG_IEND png_byte png_IEND[5] = { 73,  69,  78,  68, '\0'}
  1.2909 +#define PNG_PLTE png_byte png_PLTE[5] = { 80,  76,  84,  69, '\0'}
  1.2910 +#define PNG_bKGD png_byte png_bKGD[5] = { 98,  75,  71,  68, '\0'}
  1.2911 +#define PNG_cHRM png_byte png_cHRM[5] = { 99,  72,  82,  77, '\0'}
  1.2912 +#define PNG_gAMA png_byte png_gAMA[5] = {103,  65,  77,  65, '\0'}
  1.2913 +#define PNG_hIST png_byte png_hIST[5] = {104,  73,  83,  84, '\0'}
  1.2914 +#define PNG_iCCP png_byte png_iCCP[5] = {105,  67,  67,  80, '\0'}
  1.2915 +#define PNG_iTXt png_byte png_iTXt[5] = {105,  84,  88, 116, '\0'}
  1.2916 +#define PNG_oFFs png_byte png_oFFs[5] = {111,  70,  70, 115, '\0'}
  1.2917 +#define PNG_pCAL png_byte png_pCAL[5] = {112,  67,  65,  76, '\0'}
  1.2918 +#define PNG_sCAL png_byte png_sCAL[5] = {115,  67,  65,  76, '\0'}
  1.2919 +#define PNG_pHYs png_byte png_pHYs[5] = {112,  72,  89, 115, '\0'}
  1.2920 +#define PNG_sBIT png_byte png_sBIT[5] = {115,  66,  73,  84, '\0'}
  1.2921 +#define PNG_sPLT png_byte png_sPLT[5] = {115,  80,  76,  84, '\0'}
  1.2922 +#define PNG_sRGB png_byte png_sRGB[5] = {115,  82,  71,  66, '\0'}
  1.2923 +#define PNG_tEXt png_byte png_tEXt[5] = {116,  69,  88, 116, '\0'}
  1.2924 +#define PNG_tIME png_byte png_tIME[5] = {116,  73,  77,  69, '\0'}
  1.2925 +#define PNG_tRNS png_byte png_tRNS[5] = {116,  82,  78,  83, '\0'}
  1.2926 +#define PNG_zTXt png_byte png_zTXt[5] = {122,  84,  88, 116, '\0'}
  1.2927 +
  1.2928 +#ifdef PNG_USE_GLOBAL_ARRAYS
  1.2929 +PNG_EXPORT_VAR (png_byte FARDATA) png_IHDR[5];
  1.2930 +PNG_EXPORT_VAR (png_byte FARDATA) png_IDAT[5];
  1.2931 +PNG_EXPORT_VAR (png_byte FARDATA) png_IEND[5];
  1.2932 +PNG_EXPORT_VAR (png_byte FARDATA) png_PLTE[5];
  1.2933 +PNG_EXPORT_VAR (png_byte FARDATA) png_bKGD[5];
  1.2934 +PNG_EXPORT_VAR (png_byte FARDATA) png_cHRM[5];
  1.2935 +PNG_EXPORT_VAR (png_byte FARDATA) png_gAMA[5];
  1.2936 +PNG_EXPORT_VAR (png_byte FARDATA) png_hIST[5];
  1.2937 +PNG_EXPORT_VAR (png_byte FARDATA) png_iCCP[5];
  1.2938 +PNG_EXPORT_VAR (png_byte FARDATA) png_iTXt[5];
  1.2939 +PNG_EXPORT_VAR (png_byte FARDATA) png_oFFs[5];
  1.2940 +PNG_EXPORT_VAR (png_byte FARDATA) png_pCAL[5];
  1.2941 +PNG_EXPORT_VAR (png_byte FARDATA) png_sCAL[5];
  1.2942 +PNG_EXPORT_VAR (png_byte FARDATA) png_pHYs[5];
  1.2943 +PNG_EXPORT_VAR (png_byte FARDATA) png_sBIT[5];
  1.2944 +PNG_EXPORT_VAR (png_byte FARDATA) png_sPLT[5];
  1.2945 +PNG_EXPORT_VAR (png_byte FARDATA) png_sRGB[5];
  1.2946 +PNG_EXPORT_VAR (png_byte FARDATA) png_tEXt[5];
  1.2947 +PNG_EXPORT_VAR (png_byte FARDATA) png_tIME[5];
  1.2948 +PNG_EXPORT_VAR (png_byte FARDATA) png_tRNS[5];
  1.2949 +PNG_EXPORT_VAR (png_byte FARDATA) png_zTXt[5];
  1.2950 +#endif /* PNG_USE_GLOBAL_ARRAYS */
  1.2951 +
  1.2952 +#if defined(PNG_1_0_X) || defined (PNG_1_2_X)
  1.2953 +/* Initialize png_ptr struct for reading, and allocate any other memory.
  1.2954 + * (old interface - DEPRECATED - use png_create_read_struct instead).
  1.2955 + */
  1.2956 +extern PNG_EXPORT(void,png_read_init) PNGARG((png_structp png_ptr));
  1.2957 +#undef png_read_init
  1.2958 +#define png_read_init(png_ptr) png_read_init_3(&png_ptr, \
  1.2959 +    PNG_LIBPNG_VER_STRING,  png_sizeof(png_struct));
  1.2960 +#endif
  1.2961 +
  1.2962 +extern PNG_EXPORT(void,png_read_init_3) PNGARG((png_structpp ptr_ptr,
  1.2963 +    png_const_charp user_png_ver, png_size_t png_struct_size));
  1.2964 +#if defined(PNG_1_0_X) || defined (PNG_1_2_X)
  1.2965 +extern PNG_EXPORT(void,png_read_init_2) PNGARG((png_structp png_ptr,
  1.2966 +    png_const_charp user_png_ver, png_size_t png_struct_size, png_size_t
  1.2967 +    png_info_size));
  1.2968 +#endif
  1.2969 +
  1.2970 +#if defined(PNG_1_0_X) || defined (PNG_1_2_X)
  1.2971 +/* Initialize png_ptr struct for writing, and allocate any other memory.
  1.2972 + * (old interface - DEPRECATED - use png_create_write_struct instead).
  1.2973 + */
  1.2974 +extern PNG_EXPORT(void,png_write_init) PNGARG((png_structp png_ptr));
  1.2975 +#undef png_write_init
  1.2976 +#define png_write_init(png_ptr) png_write_init_3(&png_ptr, \
  1.2977 +    PNG_LIBPNG_VER_STRING, png_sizeof(png_struct));
  1.2978 +#endif
  1.2979 +
  1.2980 +extern PNG_EXPORT(void,png_write_init_3) PNGARG((png_structpp ptr_ptr,
  1.2981 +    png_const_charp user_png_ver, png_size_t png_struct_size));
  1.2982 +extern PNG_EXPORT(void,png_write_init_2) PNGARG((png_structp png_ptr,
  1.2983 +    png_const_charp user_png_ver, png_size_t png_struct_size, png_size_t
  1.2984 +    png_info_size));
  1.2985 +
  1.2986 +/* Allocate memory for an internal libpng struct */
  1.2987 +PNG_EXTERN png_voidp png_create_struct PNGARG((int type));
  1.2988 +
  1.2989 +/* Free memory from internal libpng struct */
  1.2990 +PNG_EXTERN void png_destroy_struct PNGARG((png_voidp struct_ptr));
  1.2991 +
  1.2992 +PNG_EXTERN png_voidp png_create_struct_2 PNGARG((int type, png_malloc_ptr
  1.2993 +  malloc_fn, png_voidp mem_ptr));
  1.2994 +PNG_EXTERN void png_destroy_struct_2 PNGARG((png_voidp struct_ptr,
  1.2995 +   png_free_ptr free_fn, png_voidp mem_ptr));
  1.2996 +
  1.2997 +/* Free any memory that info_ptr points to and reset struct. */
  1.2998 +PNG_EXTERN void png_info_destroy PNGARG((png_structp png_ptr,
  1.2999 +   png_infop info_ptr));
  1.3000 +
  1.3001 +#ifndef PNG_1_0_X
  1.3002 +/* Function to allocate memory for zlib. */
  1.3003 +PNG_EXTERN voidpf png_zalloc PNGARG((voidpf png_ptr, uInt items, uInt size));
  1.3004 +
  1.3005 +/* Function to free memory for zlib */
  1.3006 +PNG_EXTERN void png_zfree PNGARG((voidpf png_ptr, voidpf ptr));
  1.3007 +
  1.3008 +#ifdef PNG_SIZE_T
  1.3009 +/* Function to convert a sizeof an item to png_sizeof item */
  1.3010 +   PNG_EXTERN png_size_t PNGAPI png_convert_size PNGARG((size_t size));
  1.3011 +#endif
  1.3012 +
  1.3013 +/* Next four functions are used internally as callbacks.  PNGAPI is required
  1.3014 + * but not PNG_EXPORT.  PNGAPI added at libpng version 1.2.3. */
  1.3015 +
  1.3016 +PNG_EXTERN void PNGAPI png_default_read_data PNGARG((png_structp png_ptr,
  1.3017 +   png_bytep data, png_size_t length));
  1.3018 +
  1.3019 +#ifdef PNG_PROGRESSIVE_READ_SUPPORTED
  1.3020 +PNG_EXTERN void PNGAPI png_push_fill_buffer PNGARG((png_structp png_ptr,
  1.3021 +   png_bytep buffer, png_size_t length));
  1.3022 +#endif
  1.3023 +
  1.3024 +PNG_EXTERN void PNGAPI png_default_write_data PNGARG((png_structp png_ptr,
  1.3025 +   png_bytep data, png_size_t length));
  1.3026 +
  1.3027 +#if defined(PNG_WRITE_FLUSH_SUPPORTED)
  1.3028 +#if !defined(PNG_NO_STDIO)
  1.3029 +PNG_EXTERN void PNGAPI png_default_flush PNGARG((png_structp png_ptr));
  1.3030 +#endif
  1.3031 +#endif
  1.3032 +#else /* PNG_1_0_X */
  1.3033 +#ifdef PNG_PROGRESSIVE_READ_SUPPORTED
  1.3034 +PNG_EXTERN void png_push_fill_buffer PNGARG((png_structp png_ptr,
  1.3035 +   png_bytep buffer, png_size_t length));
  1.3036 +#endif
  1.3037 +#endif /* PNG_1_0_X */
  1.3038 +
  1.3039 +/* Reset the CRC variable */
  1.3040 +PNG_EXTERN void png_reset_crc PNGARG((png_structp png_ptr));
  1.3041 +
  1.3042 +/* Write the "data" buffer to whatever output you are using. */
  1.3043 +PNG_EXTERN void png_write_data PNGARG((png_structp png_ptr, png_bytep data,
  1.3044 +   png_size_t length));
  1.3045 +
  1.3046 +/* Read data from whatever input you are using into the "data" buffer */
  1.3047 +PNG_EXTERN void png_read_data PNGARG((png_structp png_ptr, png_bytep data,
  1.3048 +   png_size_t length));
  1.3049 +
  1.3050 +/* Read bytes into buf, and update png_ptr->crc */
  1.3051 +PNG_EXTERN void png_crc_read PNGARG((png_structp png_ptr, png_bytep buf,
  1.3052 +   png_size_t length));
  1.3053 +
  1.3054 +/* Decompress data in a chunk that uses compression */
  1.3055 +#if defined(PNG_zTXt_SUPPORTED) || defined(PNG_iTXt_SUPPORTED) || \
  1.3056 +    defined(PNG_iCCP_SUPPORTED) || defined(PNG_sPLT_SUPPORTED)
  1.3057 +PNG_EXTERN void png_decompress_chunk PNGARG((png_structp png_ptr,
  1.3058 +   int comp_type, png_size_t chunklength,
  1.3059 +   png_size_t prefix_length, png_size_t *data_length));
  1.3060 +#endif
  1.3061 +
  1.3062 +/* Read "skip" bytes, read the file crc, and (optionally) verify png_ptr->crc */
  1.3063 +PNG_EXTERN int png_crc_finish PNGARG((png_structp png_ptr, png_uint_32 skip));
  1.3064 +
  1.3065 +/* Read the CRC from the file and compare it to the libpng calculated CRC */
  1.3066 +PNG_EXTERN int png_crc_error PNGARG((png_structp png_ptr));
  1.3067 +
  1.3068 +/* Calculate the CRC over a section of data.  Note that we are only
  1.3069 + * passing a maximum of 64K on systems that have this as a memory limit,
  1.3070 + * since this is the maximum buffer size we can specify.
  1.3071 + */
  1.3072 +PNG_EXTERN void png_calculate_crc PNGARG((png_structp png_ptr, png_bytep ptr,
  1.3073 +   png_size_t length));
  1.3074 +
  1.3075 +#if defined(PNG_WRITE_FLUSH_SUPPORTED)
  1.3076 +PNG_EXTERN void png_flush PNGARG((png_structp png_ptr));
  1.3077 +#endif
  1.3078 +
  1.3079 +/* simple function to write the signature */
  1.3080 +PNG_EXTERN void png_write_sig PNGARG((png_structp png_ptr));
  1.3081 +
  1.3082 +/* write various chunks */
  1.3083 +
  1.3084 +/* Write the IHDR chunk, and update the png_struct with the necessary
  1.3085 + * information.
  1.3086 + */
  1.3087 +PNG_EXTERN void png_write_IHDR PNGARG((png_structp png_ptr, png_uint_32 width,
  1.3088 +   png_uint_32 height,
  1.3089 +   int bit_depth, int color_type, int compression_method, int filter_method,
  1.3090 +   int interlace_method));
  1.3091 +
  1.3092 +PNG_EXTERN void png_write_PLTE PNGARG((png_structp png_ptr, png_colorp palette,
  1.3093 +   png_uint_32 num_pal));
  1.3094 +
  1.3095 +PNG_EXTERN void png_write_IDAT PNGARG((png_structp png_ptr, png_bytep data,
  1.3096 +   png_size_t length));
  1.3097 +
  1.3098 +PNG_EXTERN void png_write_IEND PNGARG((png_structp png_ptr));
  1.3099 +
  1.3100 +#if defined(PNG_WRITE_gAMA_SUPPORTED)
  1.3101 +#ifdef PNG_FLOATING_POINT_SUPPORTED
  1.3102 +PNG_EXTERN void png_write_gAMA PNGARG((png_structp png_ptr, double file_gamma));
  1.3103 +#endif
  1.3104 +#ifdef PNG_FIXED_POINT_SUPPORTED
  1.3105 +PNG_EXTERN void png_write_gAMA_fixed PNGARG((png_structp png_ptr, png_fixed_point
  1.3106 +    file_gamma));
  1.3107 +#endif
  1.3108 +#endif
  1.3109 +
  1.3110 +#if defined(PNG_WRITE_sBIT_SUPPORTED)
  1.3111 +PNG_EXTERN void png_write_sBIT PNGARG((png_structp png_ptr, png_color_8p sbit,
  1.3112 +   int color_type));
  1.3113 +#endif
  1.3114 +
  1.3115 +#if defined(PNG_WRITE_cHRM_SUPPORTED)
  1.3116 +#ifdef PNG_FLOATING_POINT_SUPPORTED
  1.3117 +PNG_EXTERN void png_write_cHRM PNGARG((png_structp png_ptr,
  1.3118 +   double white_x, double white_y,
  1.3119 +   double red_x, double red_y, double green_x, double green_y,
  1.3120 +   double blue_x, double blue_y));
  1.3121 +#endif
  1.3122 +#ifdef PNG_FIXED_POINT_SUPPORTED
  1.3123 +PNG_EXTERN void png_write_cHRM_fixed PNGARG((png_structp png_ptr,
  1.3124 +   png_fixed_point int_white_x, png_fixed_point int_white_y,
  1.3125 +   png_fixed_point int_red_x, png_fixed_point int_red_y, png_fixed_point
  1.3126 +   int_green_x, png_fixed_point int_green_y, png_fixed_point int_blue_x,
  1.3127 +   png_fixed_point int_blue_y));
  1.3128 +#endif
  1.3129 +#endif
  1.3130 +
  1.3131 +#if defined(PNG_WRITE_sRGB_SUPPORTED)
  1.3132 +PNG_EXTERN void png_write_sRGB PNGARG((png_structp png_ptr,
  1.3133 +   int intent));
  1.3134 +#endif
  1.3135 +
  1.3136 +#if defined(PNG_WRITE_iCCP_SUPPORTED)
  1.3137 +PNG_EXTERN void png_write_iCCP PNGARG((png_structp png_ptr,
  1.3138 +   png_charp name, int compression_type,
  1.3139 +   png_charp profile, int proflen));
  1.3140 +   /* Note to maintainer: profile should be png_bytep */
  1.3141 +#endif
  1.3142 +
  1.3143 +#if defined(PNG_WRITE_sPLT_SUPPORTED)
  1.3144 +PNG_EXTERN void png_write_sPLT PNGARG((png_structp png_ptr,
  1.3145 +   png_sPLT_tp palette));
  1.3146 +#endif
  1.3147 +
  1.3148 +#if defined(PNG_WRITE_tRNS_SUPPORTED)
  1.3149 +PNG_EXTERN void png_write_tRNS PNGARG((png_structp png_ptr, png_bytep trans,
  1.3150 +   png_color_16p values, int number, int color_type));
  1.3151 +#endif
  1.3152 +
  1.3153 +#if defined(PNG_WRITE_bKGD_SUPPORTED)
  1.3154 +PNG_EXTERN void png_write_bKGD PNGARG((png_structp png_ptr,
  1.3155 +   png_color_16p values, int color_type));
  1.3156 +#endif
  1.3157 +
  1.3158 +#if defined(PNG_WRITE_hIST_SUPPORTED)
  1.3159 +PNG_EXTERN void png_write_hIST PNGARG((png_structp png_ptr, png_uint_16p hist,
  1.3160 +   int num_hist));
  1.3161 +#endif
  1.3162 +
  1.3163 +#if defined(PNG_WRITE_TEXT_SUPPORTED) || defined(PNG_WRITE_pCAL_SUPPORTED) || \
  1.3164 +    defined(PNG_WRITE_iCCP_SUPPORTED) || defined(PNG_WRITE_sPLT_SUPPORTED)
  1.3165 +PNG_EXTERN png_size_t png_check_keyword PNGARG((png_structp png_ptr,
  1.3166 +   png_charp key, png_charpp new_key));
  1.3167 +#endif
  1.3168 +
  1.3169 +#if defined(PNG_WRITE_tEXt_SUPPORTED)
  1.3170 +PNG_EXTERN void png_write_tEXt PNGARG((png_structp png_ptr, png_charp key,
  1.3171 +   png_charp text, png_size_t text_len));
  1.3172 +#endif
  1.3173 +
  1.3174 +#if defined(PNG_WRITE_zTXt_SUPPORTED)
  1.3175 +PNG_EXTERN void png_write_zTXt PNGARG((png_structp png_ptr, png_charp key,
  1.3176 +   png_charp text, png_size_t text_len, int compression));
  1.3177 +#endif
  1.3178 +
  1.3179 +#if defined(PNG_WRITE_iTXt_SUPPORTED)
  1.3180 +PNG_EXTERN void png_write_iTXt PNGARG((png_structp png_ptr,
  1.3181 +   int compression, png_charp key, png_charp lang, png_charp lang_key,
  1.3182 +   png_charp text));
  1.3183 +#endif
  1.3184 +
  1.3185 +#if defined(PNG_TEXT_SUPPORTED)  /* Added at version 1.0.14 and 1.2.4 */
  1.3186 +PNG_EXTERN int png_set_text_2 PNGARG((png_structp png_ptr,
  1.3187 +   png_infop info_ptr, png_textp text_ptr, int num_text));
  1.3188 +#endif
  1.3189 +
  1.3190 +#if defined(PNG_WRITE_oFFs_SUPPORTED)
  1.3191 +PNG_EXTERN void png_write_oFFs PNGARG((png_structp png_ptr,
  1.3192 +   png_int_32 x_offset, png_int_32 y_offset, int unit_type));
  1.3193 +#endif
  1.3194 +
  1.3195 +#if defined(PNG_WRITE_pCAL_SUPPORTED)
  1.3196 +PNG_EXTERN void png_write_pCAL PNGARG((png_structp png_ptr, png_charp purpose,
  1.3197 +   png_int_32 X0, png_int_32 X1, int type, int nparams,
  1.3198 +   png_charp units, png_charpp params));
  1.3199 +#endif
  1.3200 +
  1.3201 +#if defined(PNG_WRITE_pHYs_SUPPORTED)
  1.3202 +PNG_EXTERN void png_write_pHYs PNGARG((png_structp png_ptr,
  1.3203 +   png_uint_32 x_pixels_per_unit, png_uint_32 y_pixels_per_unit,
  1.3204 +   int unit_type));
  1.3205 +#endif
  1.3206 +
  1.3207 +#if defined(PNG_WRITE_tIME_SUPPORTED)
  1.3208 +PNG_EXTERN void png_write_tIME PNGARG((png_structp png_ptr,
  1.3209 +   png_timep mod_time));
  1.3210 +#endif
  1.3211 +
  1.3212 +#if defined(PNG_WRITE_sCAL_SUPPORTED)
  1.3213 +#if defined(PNG_FLOATING_POINT_SUPPORTED) && !defined(PNG_NO_STDIO)
  1.3214 +PNG_EXTERN void png_write_sCAL PNGARG((png_structp png_ptr,
  1.3215 +   int unit, double width, double height));
  1.3216 +#else
  1.3217 +#ifdef PNG_FIXED_POINT_SUPPORTED
  1.3218 +PNG_EXTERN void png_write_sCAL_s PNGARG((png_structp png_ptr,
  1.3219 +   int unit, png_charp width, png_charp height));
  1.3220 +#endif
  1.3221 +#endif
  1.3222 +#endif
  1.3223 +
  1.3224 +/* Called when finished processing a row of data */
  1.3225 +PNG_EXTERN void png_write_finish_row PNGARG((png_structp png_ptr));
  1.3226 +
  1.3227 +/* Internal use only.   Called before first row of data */
  1.3228 +PNG_EXTERN void png_write_start_row PNGARG((png_structp png_ptr));
  1.3229 +
  1.3230 +#if defined(PNG_READ_GAMMA_SUPPORTED)
  1.3231 +PNG_EXTERN void png_build_gamma_table PNGARG((png_structp png_ptr));
  1.3232 +#endif
  1.3233 +
  1.3234 +/* combine a row of data, dealing with alpha, etc. if requested */
  1.3235 +PNG_EXTERN void png_combine_row PNGARG((png_structp png_ptr, png_bytep row,
  1.3236 +   int mask));
  1.3237 +
  1.3238 +#if defined(PNG_READ_INTERLACING_SUPPORTED)
  1.3239 +/* expand an interlaced row */
  1.3240 +/* OLD pre-1.0.9 interface:
  1.3241 +PNG_EXTERN void png_do_read_interlace PNGARG((png_row_infop row_info,
  1.3242 +   png_bytep row, int pass, png_uint_32 transformations));
  1.3243 + */
  1.3244 +PNG_EXTERN void png_do_read_interlace PNGARG((png_structp png_ptr));
  1.3245 +#endif
  1.3246 +
  1.3247 +/* GRR TO DO (2.0 or whenever):  simplify other internal calling interfaces */
  1.3248 +
  1.3249 +#if defined(PNG_WRITE_INTERLACING_SUPPORTED)
  1.3250 +/* grab pixels out of a row for an interlaced pass */
  1.3251 +PNG_EXTERN void png_do_write_interlace PNGARG((png_row_infop row_info,
  1.3252 +   png_bytep row, int pass));
  1.3253 +#endif
  1.3254 +
  1.3255 +/* unfilter a row */
  1.3256 +PNG_EXTERN void png_read_filter_row PNGARG((png_structp png_ptr,
  1.3257 +   png_row_infop row_info, png_bytep row, png_bytep prev_row, int filter));
  1.3258 +
  1.3259 +/* Choose the best filter to use and filter the row data */
  1.3260 +PNG_EXTERN void png_write_find_filter PNGARG((png_structp png_ptr,
  1.3261 +   png_row_infop row_info));
  1.3262 +
  1.3263 +/* Write out the filtered row. */
  1.3264 +PNG_EXTERN void png_write_filtered_row PNGARG((png_structp png_ptr,
  1.3265 +   png_bytep filtered_row));
  1.3266 +/* finish a row while reading, dealing with interlacing passes, etc. */
  1.3267 +PNG_EXTERN void png_read_finish_row PNGARG((png_structp png_ptr));
  1.3268 +
  1.3269 +/* initialize the row buffers, etc. */
  1.3270 +PNG_EXTERN void png_read_start_row PNGARG((png_structp png_ptr));
  1.3271 +/* optional call to update the users info structure */
  1.3272 +PNG_EXTERN void png_read_transform_info PNGARG((png_structp png_ptr,
  1.3273 +   png_infop info_ptr));
  1.3274 +
  1.3275 +/* these are the functions that do the transformations */
  1.3276 +#if defined(PNG_READ_FILLER_SUPPORTED)
  1.3277 +PNG_EXTERN void png_do_read_filler PNGARG((png_row_infop row_info,
  1.3278 +   png_bytep row, png_uint_32 filler, png_uint_32 flags));
  1.3279 +#endif
  1.3280 +
  1.3281 +#if defined(PNG_READ_SWAP_ALPHA_SUPPORTED)
  1.3282 +PNG_EXTERN void png_do_read_swap_alpha PNGARG((png_row_infop row_info,
  1.3283 +   png_bytep row));
  1.3284 +#endif
  1.3285 +
  1.3286 +#if defined(PNG_WRITE_SWAP_ALPHA_SUPPORTED)
  1.3287 +PNG_EXTERN void png_do_write_swap_alpha PNGARG((png_row_infop row_info,
  1.3288 +   png_bytep row));
  1.3289 +#endif
  1.3290 +
  1.3291 +#if defined(PNG_READ_INVERT_ALPHA_SUPPORTED)
  1.3292 +PNG_EXTERN void png_do_read_invert_alpha PNGARG((png_row_infop row_info,
  1.3293 +   png_bytep row));
  1.3294 +#endif
  1.3295 +
  1.3296 +#if defined(PNG_WRITE_INVERT_ALPHA_SUPPORTED)
  1.3297 +PNG_EXTERN void png_do_write_invert_alpha PNGARG((png_row_infop row_info,
  1.3298 +   png_bytep row));
  1.3299 +#endif
  1.3300 +
  1.3301 +#if defined(PNG_WRITE_FILLER_SUPPORTED) || \
  1.3302 +    defined(PNG_READ_STRIP_ALPHA_SUPPORTED)
  1.3303 +PNG_EXTERN void png_do_strip_filler PNGARG((png_row_infop row_info,
  1.3304 +   png_bytep row, png_uint_32 flags));
  1.3305 +#endif
  1.3306 +
  1.3307 +#if defined(PNG_READ_SWAP_SUPPORTED) || defined(PNG_WRITE_SWAP_SUPPORTED)
  1.3308 +PNG_EXTERN void png_do_swap PNGARG((png_row_infop row_info, png_bytep row));
  1.3309 +#endif
  1.3310 +
  1.3311 +#if defined(PNG_READ_PACKSWAP_SUPPORTED) || defined(PNG_WRITE_PACKSWAP_SUPPORTED)
  1.3312 +PNG_EXTERN void png_do_packswap PNGARG((png_row_infop row_info, png_bytep row));
  1.3313 +#endif
  1.3314 +
  1.3315 +#if defined(PNG_READ_RGB_TO_GRAY_SUPPORTED)
  1.3316 +PNG_EXTERN int png_do_rgb_to_gray PNGARG((png_structp png_ptr, png_row_infop
  1.3317 +   row_info, png_bytep row));
  1.3318 +#endif
  1.3319 +
  1.3320 +#if defined(PNG_READ_GRAY_TO_RGB_SUPPORTED)
  1.3321 +PNG_EXTERN void png_do_gray_to_rgb PNGARG((png_row_infop row_info,
  1.3322 +   png_bytep row));
  1.3323 +#endif
  1.3324 +
  1.3325 +#if defined(PNG_READ_PACK_SUPPORTED)
  1.3326 +PNG_EXTERN void png_do_unpack PNGARG((png_row_infop row_info, png_bytep row));
  1.3327 +#endif
  1.3328 +
  1.3329 +#if defined(PNG_READ_SHIFT_SUPPORTED)
  1.3330 +PNG_EXTERN void png_do_unshift PNGARG((png_row_infop row_info, png_bytep row,
  1.3331 +   png_color_8p sig_bits));
  1.3332 +#endif
  1.3333 +
  1.3334 +#if defined(PNG_READ_INVERT_SUPPORTED) || defined(PNG_WRITE_INVERT_SUPPORTED)
  1.3335 +PNG_EXTERN void png_do_invert PNGARG((png_row_infop row_info, png_bytep row));
  1.3336 +#endif
  1.3337 +
  1.3338 +#if defined(PNG_READ_16_TO_8_SUPPORTED)
  1.3339 +PNG_EXTERN void png_do_chop PNGARG((png_row_infop row_info, png_bytep row));
  1.3340 +#endif
  1.3341 +
  1.3342 +#if defined(PNG_READ_DITHER_SUPPORTED)
  1.3343 +PNG_EXTERN void png_do_dither PNGARG((png_row_infop row_info,
  1.3344 +   png_bytep row, png_bytep palette_lookup, png_bytep dither_lookup));
  1.3345 +
  1.3346 +#  if defined(PNG_CORRECT_PALETTE_SUPPORTED)
  1.3347 +PNG_EXTERN void png_correct_palette PNGARG((png_structp png_ptr,
  1.3348 +   png_colorp palette, int num_palette));
  1.3349 +#  endif
  1.3350 +#endif
  1.3351 +
  1.3352 +#if defined(PNG_READ_BGR_SUPPORTED) || defined(PNG_WRITE_BGR_SUPPORTED)
  1.3353 +PNG_EXTERN void png_do_bgr PNGARG((png_row_infop row_info, png_bytep row));
  1.3354 +#endif
  1.3355 +
  1.3356 +#if defined(PNG_WRITE_PACK_SUPPORTED)
  1.3357 +PNG_EXTERN void png_do_pack PNGARG((png_row_infop row_info,
  1.3358 +   png_bytep row, png_uint_32 bit_depth));
  1.3359 +#endif
  1.3360 +
  1.3361 +#if defined(PNG_WRITE_SHIFT_SUPPORTED)
  1.3362 +PNG_EXTERN void png_do_shift PNGARG((png_row_infop row_info, png_bytep row,
  1.3363 +   png_color_8p bit_depth));
  1.3364 +#endif
  1.3365 +
  1.3366 +#if defined(PNG_READ_BACKGROUND_SUPPORTED)
  1.3367 +#if defined(PNG_READ_GAMMA_SUPPORTED)
  1.3368 +PNG_EXTERN void png_do_background PNGARG((png_row_infop row_info, png_bytep row,
  1.3369 +   png_color_16p trans_values, png_color_16p background,
  1.3370 +   png_color_16p background_1,
  1.3371 +   png_bytep gamma_table, png_bytep gamma_from_1, png_bytep gamma_to_1,
  1.3372 +   png_uint_16pp gamma_16, png_uint_16pp gamma_16_from_1,
  1.3373 +   png_uint_16pp gamma_16_to_1, int gamma_shift));
  1.3374 +#else
  1.3375 +PNG_EXTERN void png_do_background PNGARG((png_row_infop row_info, png_bytep row,
  1.3376 +   png_color_16p trans_values, png_color_16p background));
  1.3377 +#endif
  1.3378 +#endif
  1.3379 +
  1.3380 +#if defined(PNG_READ_GAMMA_SUPPORTED)
  1.3381 +PNG_EXTERN void png_do_gamma PNGARG((png_row_infop row_info, png_bytep row,
  1.3382 +   png_bytep gamma_table, png_uint_16pp gamma_16_table,
  1.3383 +   int gamma_shift));
  1.3384 +#endif
  1.3385 +
  1.3386 +#if defined(PNG_READ_EXPAND_SUPPORTED)
  1.3387 +PNG_EXTERN void png_do_expand_palette PNGARG((png_row_infop row_info,
  1.3388 +   png_bytep row, png_colorp palette, png_bytep trans, int num_trans));
  1.3389 +PNG_EXTERN void png_do_expand PNGARG((png_row_infop row_info,
  1.3390 +   png_bytep row, png_color_16p trans_value));
  1.3391 +#endif
  1.3392 +
  1.3393 +/* The following decodes the appropriate chunks, and does error correction,
  1.3394 + * then calls the appropriate callback for the chunk if it is valid.
  1.3395 + */
  1.3396 +
  1.3397 +/* decode the IHDR chunk */
  1.3398 +PNG_EXTERN void png_handle_IHDR PNGARG((png_structp png_ptr, png_infop info_ptr,
  1.3399 +   png_uint_32 length));
  1.3400 +PNG_EXTERN void png_handle_PLTE PNGARG((png_structp png_ptr, png_infop info_ptr,
  1.3401 +   png_uint_32 length));
  1.3402 +PNG_EXTERN void png_handle_IEND PNGARG((png_structp png_ptr, png_infop info_ptr,
  1.3403 +   png_uint_32 length));
  1.3404 +
  1.3405 +#if defined(PNG_READ_bKGD_SUPPORTED)
  1.3406 +PNG_EXTERN void png_handle_bKGD PNGARG((png_structp png_ptr, png_infop info_ptr,
  1.3407 +   png_uint_32 length));
  1.3408 +#endif
  1.3409 +
  1.3410 +#if defined(PNG_READ_cHRM_SUPPORTED)
  1.3411 +PNG_EXTERN void png_handle_cHRM PNGARG((png_structp png_ptr, png_infop info_ptr,
  1.3412 +   png_uint_32 length));
  1.3413 +#endif
  1.3414 +
  1.3415 +#if defined(PNG_READ_gAMA_SUPPORTED)
  1.3416 +PNG_EXTERN void png_handle_gAMA PNGARG((png_structp png_ptr, png_infop info_ptr,
  1.3417 +   png_uint_32 length));
  1.3418 +#endif
  1.3419 +
  1.3420 +#if defined(PNG_READ_hIST_SUPPORTED)
  1.3421 +PNG_EXTERN void png_handle_hIST PNGARG((png_structp png_ptr, png_infop info_ptr,
  1.3422 +   png_uint_32 length));
  1.3423 +#endif
  1.3424 +
  1.3425 +#if defined(PNG_READ_iCCP_SUPPORTED)
  1.3426 +extern void png_handle_iCCP PNGARG((png_structp png_ptr, png_infop info_ptr,
  1.3427 +   png_uint_32 length));
  1.3428 +#endif /* PNG_READ_iCCP_SUPPORTED */
  1.3429 +
  1.3430 +#if defined(PNG_READ_iTXt_SUPPORTED)
  1.3431 +PNG_EXTERN void png_handle_iTXt PNGARG((png_structp png_ptr, png_infop info_ptr,
  1.3432 +   png_uint_32 length));
  1.3433 +#endif
  1.3434 +
  1.3435 +#if defined(PNG_READ_oFFs_SUPPORTED)
  1.3436 +PNG_EXTERN void png_handle_oFFs PNGARG((png_structp png_ptr, png_infop info_ptr,
  1.3437 +   png_uint_32 length));
  1.3438 +#endif
  1.3439 +
  1.3440 +#if defined(PNG_READ_pCAL_SUPPORTED)
  1.3441 +PNG_EXTERN void png_handle_pCAL PNGARG((png_structp png_ptr, png_infop info_ptr,
  1.3442 +   png_uint_32 length));
  1.3443 +#endif
  1.3444 +
  1.3445 +#if defined(PNG_READ_pHYs_SUPPORTED)
  1.3446 +PNG_EXTERN void png_handle_pHYs PNGARG((png_structp png_ptr, png_infop info_ptr,
  1.3447 +   png_uint_32 length));
  1.3448 +#endif
  1.3449 +
  1.3450 +#if defined(PNG_READ_sBIT_SUPPORTED)
  1.3451 +PNG_EXTERN void png_handle_sBIT PNGARG((png_structp png_ptr, png_infop info_ptr,
  1.3452 +   png_uint_32 length));
  1.3453 +#endif
  1.3454 +
  1.3455 +#if defined(PNG_READ_sCAL_SUPPORTED)
  1.3456 +PNG_EXTERN void png_handle_sCAL PNGARG((png_structp png_ptr, png_infop info_ptr,
  1.3457 +   png_uint_32 length));
  1.3458 +#endif
  1.3459 +
  1.3460 +#if defined(PNG_READ_sPLT_SUPPORTED)
  1.3461 +extern void png_handle_sPLT PNGARG((png_structp png_ptr, png_infop info_ptr,
  1.3462 +   png_uint_32 length));
  1.3463 +#endif /* PNG_READ_sPLT_SUPPORTED */
  1.3464 +
  1.3465 +#if defined(PNG_READ_sRGB_SUPPORTED)
  1.3466 +PNG_EXTERN void png_handle_sRGB PNGARG((png_structp png_ptr, png_infop info_ptr,
  1.3467 +   png_uint_32 length));
  1.3468 +#endif
  1.3469 +
  1.3470 +#if defined(PNG_READ_tEXt_SUPPORTED)
  1.3471 +PNG_EXTERN void png_handle_tEXt PNGARG((png_structp png_ptr, png_infop info_ptr,
  1.3472 +   png_uint_32 length));
  1.3473 +#endif
  1.3474 +
  1.3475 +#if defined(PNG_READ_tIME_SUPPORTED)
  1.3476 +PNG_EXTERN void png_handle_tIME PNGARG((png_structp png_ptr, png_infop info_ptr,
  1.3477 +   png_uint_32 length));
  1.3478 +#endif
  1.3479 +
  1.3480 +#if defined(PNG_READ_tRNS_SUPPORTED)
  1.3481 +PNG_EXTERN void png_handle_tRNS PNGARG((png_structp png_ptr, png_infop info_ptr,
  1.3482 +   png_uint_32 length));
  1.3483 +#endif
  1.3484 +
  1.3485 +#if defined(PNG_READ_zTXt_SUPPORTED)
  1.3486 +PNG_EXTERN void png_handle_zTXt PNGARG((png_structp png_ptr, png_infop info_ptr,
  1.3487 +   png_uint_32 length));
  1.3488 +#endif
  1.3489 +
  1.3490 +PNG_EXTERN void png_handle_unknown PNGARG((png_structp png_ptr,
  1.3491 +   png_infop info_ptr, png_uint_32 length));
  1.3492 +
  1.3493 +PNG_EXTERN void png_check_chunk_name PNGARG((png_structp png_ptr,
  1.3494 +   png_bytep chunk_name));
  1.3495 +
  1.3496 +/* handle the transformations for reading and writing */
  1.3497 +PNG_EXTERN void png_do_read_transformations PNGARG((png_structp png_ptr));
  1.3498 +PNG_EXTERN void png_do_write_transformations PNGARG((png_structp png_ptr));
  1.3499 +
  1.3500 +PNG_EXTERN void png_init_read_transformations PNGARG((png_structp png_ptr));
  1.3501 +
  1.3502 +#ifdef PNG_PROGRESSIVE_READ_SUPPORTED
  1.3503 +PNG_EXTERN void png_push_read_chunk PNGARG((png_structp png_ptr,
  1.3504 +   png_infop info_ptr));
  1.3505 +PNG_EXTERN void png_push_read_sig PNGARG((png_structp png_ptr,
  1.3506 +   png_infop info_ptr));
  1.3507 +PNG_EXTERN void png_push_check_crc PNGARG((png_structp png_ptr));
  1.3508 +PNG_EXTERN void png_push_crc_skip PNGARG((png_structp png_ptr,
  1.3509 +   png_uint_32 length));
  1.3510 +PNG_EXTERN void png_push_crc_finish PNGARG((png_structp png_ptr));
  1.3511 +PNG_EXTERN void png_push_save_buffer PNGARG((png_structp png_ptr));
  1.3512 +PNG_EXTERN void png_push_restore_buffer PNGARG((png_structp png_ptr,
  1.3513 +   png_bytep buffer, png_size_t buffer_length));
  1.3514 +PNG_EXTERN void png_push_read_IDAT PNGARG((png_structp png_ptr));
  1.3515 +PNG_EXTERN void png_process_IDAT_data PNGARG((png_structp png_ptr,
  1.3516 +   png_bytep buffer, png_size_t buffer_length));
  1.3517 +PNG_EXTERN void png_push_process_row PNGARG((png_structp png_ptr));
  1.3518 +PNG_EXTERN void png_push_handle_unknown PNGARG((png_structp png_ptr,
  1.3519 +   png_infop info_ptr, png_uint_32 length));
  1.3520 +PNG_EXTERN void png_push_have_info PNGARG((png_structp png_ptr,
  1.3521 +   png_infop info_ptr));
  1.3522 +PNG_EXTERN void png_push_have_end PNGARG((png_structp png_ptr,
  1.3523 +   png_infop info_ptr));
  1.3524 +PNG_EXTERN void png_push_have_row PNGARG((png_structp png_ptr, png_bytep row));
  1.3525 +PNG_EXTERN void png_push_read_end PNGARG((png_structp png_ptr,
  1.3526 +   png_infop info_ptr));
  1.3527 +PNG_EXTERN void png_process_some_data PNGARG((png_structp png_ptr,
  1.3528 +   png_infop info_ptr));
  1.3529 +PNG_EXTERN void png_read_push_finish_row PNGARG((png_structp png_ptr));
  1.3530 +#if defined(PNG_READ_tEXt_SUPPORTED)
  1.3531 +PNG_EXTERN void png_push_handle_tEXt PNGARG((png_structp png_ptr,
  1.3532 +   png_infop info_ptr, png_uint_32 length));
  1.3533 +PNG_EXTERN void png_push_read_tEXt PNGARG((png_structp png_ptr,
  1.3534 +   png_infop info_ptr));
  1.3535 +#endif
  1.3536 +#if defined(PNG_READ_zTXt_SUPPORTED)
  1.3537 +PNG_EXTERN void png_push_handle_zTXt PNGARG((png_structp png_ptr,
  1.3538 +   png_infop info_ptr, png_uint_32 length));
  1.3539 +PNG_EXTERN void png_push_read_zTXt PNGARG((png_structp png_ptr,
  1.3540 +   png_infop info_ptr));
  1.3541 +#endif
  1.3542 +#if defined(PNG_READ_iTXt_SUPPORTED)
  1.3543 +PNG_EXTERN void png_push_handle_iTXt PNGARG((png_structp png_ptr,
  1.3544 +   png_infop info_ptr, png_uint_32 length));
  1.3545 +PNG_EXTERN void png_push_read_iTXt PNGARG((png_structp png_ptr,
  1.3546 +   png_infop info_ptr));
  1.3547 +#endif
  1.3548 +
  1.3549 +#endif /* PNG_PROGRESSIVE_READ_SUPPORTED */
  1.3550 +
  1.3551 +#ifdef PNG_MNG_FEATURES_SUPPORTED
  1.3552 +PNG_EXTERN void png_do_read_intrapixel PNGARG((png_row_infop row_info,
  1.3553 +   png_bytep row));
  1.3554 +PNG_EXTERN void png_do_write_intrapixel PNGARG((png_row_infop row_info,
  1.3555 +   png_bytep row));
  1.3556 +#endif
  1.3557 +
  1.3558 +#if defined(PNG_ASSEMBLER_CODE_SUPPORTED)
  1.3559 +#if defined(PNG_MMX_CODE_SUPPORTED)
  1.3560 +/* png.c */ /* PRIVATE */
  1.3561 +PNG_EXTERN void png_init_mmx_flags PNGARG((png_structp png_ptr));
  1.3562 +#endif
  1.3563 +#endif
  1.3564 +
  1.3565 +#if defined(PNG_INCH_CONVERSIONS) && defined(PNG_FLOATING_POINT_SUPPORTED)
  1.3566 +PNG_EXTERN png_uint_32 png_get_pixels_per_inch PNGARG((png_structp png_ptr,
  1.3567 +png_infop info_ptr));
  1.3568 +
  1.3569 +PNG_EXTERN png_uint_32 png_get_x_pixels_per_inch PNGARG((png_structp png_ptr,
  1.3570 +png_infop info_ptr));
  1.3571 +
  1.3572 +PNG_EXTERN png_uint_32 png_get_y_pixels_per_inch PNGARG((png_structp png_ptr,
  1.3573 +png_infop info_ptr));
  1.3574 +
  1.3575 +PNG_EXTERN float png_get_x_offset_inches PNGARG((png_structp png_ptr,
  1.3576 +png_infop info_ptr));
  1.3577 +
  1.3578 +PNG_EXTERN float png_get_y_offset_inches PNGARG((png_structp png_ptr,
  1.3579 +png_infop info_ptr));
  1.3580 +
  1.3581 +#if defined(PNG_pHYs_SUPPORTED)
  1.3582 +PNG_EXTERN png_uint_32 png_get_pHYs_dpi PNGARG((png_structp png_ptr,
  1.3583 +png_infop info_ptr, png_uint_32 *res_x, png_uint_32 *res_y, int *unit_type));
  1.3584 +#endif /* PNG_pHYs_SUPPORTED */
  1.3585 +#endif  /* PNG_INCH_CONVERSIONS && PNG_FLOATING_POINT_SUPPORTED */
  1.3586 +
  1.3587 +/* Read the chunk header (length + type name) */
  1.3588 +PNG_EXTERN png_uint_32 png_read_chunk_header PNGARG((png_structp png_ptr));
  1.3589 +
  1.3590 +/* Maintainer: Put new private prototypes here ^ and in libpngpf.3 */
  1.3591 +
  1.3592 +#endif /* PNG_INTERNAL */
  1.3593 +
  1.3594 +#ifdef __cplusplus
  1.3595 +}
  1.3596 +#endif
  1.3597 +
  1.3598 +#endif /* PNG_VERSION_INFO_ONLY */
  1.3599 +/* do not put anything past this line */
  1.3600 +#endif /* PNG_H */