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/src/FreeImage/Source/LibPNG/png.h

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   1
   2/* png.h - header file for PNG reference library
   3 *
   4 * libpng version 1.5.9 - February 18, 2012
   5 * Copyright (c) 1998-2012 Glenn Randers-Pehrson
   6 * (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger)
   7 * (Version 0.88 Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.)
   8 *
   9 * This code is released under the libpng license (See LICENSE, below)
  10 *
  11 * Authors and maintainers:
  12 *   libpng versions 0.71, May 1995, through 0.88, January 1996: Guy Schalnat
  13 *   libpng versions 0.89c, June 1996, through 0.96, May 1997: Andreas Dilger
  14 *   libpng versions 0.97, January 1998, through 1.5.9 - February 18, 2012: Glenn
  15 *   See also "Contributing Authors", below.
  16 *
  17 * Note about libpng version numbers:
  18 *
  19 *   Due to various miscommunications, unforeseen code incompatibilities
  20 *   and occasional factors outside the authors' control, version numbering
  21 *   on the library has not always been consistent and straightforward.
  22 *   The following table summarizes matters since version 0.89c, which was
  23 *   the first widely used release:
  24 *
  25 *    source                 png.h  png.h  shared-lib
  26 *    version                string   int  version
  27 *    -------                ------ -----  ----------
  28 *    0.89c "1.0 beta 3"     0.89      89  1.0.89
  29 *    0.90  "1.0 beta 4"     0.90      90  0.90  [should have been 2.0.90]
  30 *    0.95  "1.0 beta 5"     0.95      95  0.95  [should have been 2.0.95]
  31 *    0.96  "1.0 beta 6"     0.96      96  0.96  [should have been 2.0.96]
  32 *    0.97b "1.00.97 beta 7" 1.00.97   97  1.0.1 [should have been 2.0.97]
  33 *    0.97c                  0.97      97  2.0.97
  34 *    0.98                   0.98      98  2.0.98
  35 *    0.99                   0.99      98  2.0.99
  36 *    0.99a-m                0.99      99  2.0.99
  37 *    1.00                   1.00     100  2.1.0 [100 should be 10000]
  38 *    1.0.0      (from here on, the   100  2.1.0 [100 should be 10000]
  39 *    1.0.1       png.h string is   10001  2.1.0
  40 *    1.0.1a-e    identical to the  10002  from here on, the shared library
  41 *    1.0.2       source version)   10002  is 2.V where V is the source code
  42 *    1.0.2a-b                      10003  version, except as noted.
  43 *    1.0.3                         10003
  44 *    1.0.3a-d                      10004
  45 *    1.0.4                         10004
  46 *    1.0.4a-f                      10005
  47 *    1.0.5 (+ 2 patches)           10005
  48 *    1.0.5a-d                      10006
  49 *    1.0.5e-r                      10100 (not source compatible)
  50 *    1.0.5s-v                      10006 (not binary compatible)
  51 *    1.0.6 (+ 3 patches)           10006 (still binary incompatible)
  52 *    1.0.6d-f                      10007 (still binary incompatible)
  53 *    1.0.6g                        10007
  54 *    1.0.6h                        10007  10.6h (testing xy.z so-numbering)
  55 *    1.0.6i                        10007  10.6i
  56 *    1.0.6j                        10007  2.1.0.6j (incompatible with 1.0.0)
  57 *    1.0.7beta11-14        DLLNUM  10007  2.1.0.7beta11-14 (binary compatible)
  58 *    1.0.7beta15-18           1    10007  2.1.0.7beta15-18 (binary compatible)
  59 *    1.0.7rc1-2               1    10007  2.1.0.7rc1-2 (binary compatible)
  60 *    1.0.7                    1    10007  (still compatible)
  61 *    1.0.8beta1-4             1    10008  2.1.0.8beta1-4
  62 *    1.0.8rc1                 1    10008  2.1.0.8rc1
  63 *    1.0.8                    1    10008  2.1.0.8
  64 *    1.0.9beta1-6             1    10009  2.1.0.9beta1-6
  65 *    1.0.9rc1                 1    10009  2.1.0.9rc1
  66 *    1.0.9beta7-10            1    10009  2.1.0.9beta7-10
  67 *    1.0.9rc2                 1    10009  2.1.0.9rc2
  68 *    1.0.9                    1    10009  2.1.0.9
  69 *    1.0.10beta1              1    10010  2.1.0.10beta1
  70 *    1.0.10rc1                1    10010  2.1.0.10rc1
  71 *    1.0.10                   1    10010  2.1.0.10
  72 *    1.0.11beta1-3            1    10011  2.1.0.11beta1-3
  73 *    1.0.11rc1                1    10011  2.1.0.11rc1
  74 *    1.0.11                   1    10011  2.1.0.11
  75 *    1.0.12beta1-2            2    10012  2.1.0.12beta1-2
  76 *    1.0.12rc1                2    10012  2.1.0.12rc1
  77 *    1.0.12                   2    10012  2.1.0.12
  78 *    1.1.0a-f                 -    10100  2.1.1.0a-f (branch abandoned)
  79 *    1.2.0beta1-2             2    10200  2.1.2.0beta1-2
  80 *    1.2.0beta3-5             3    10200  3.1.2.0beta3-5
  81 *    1.2.0rc1                 3    10200  3.1.2.0rc1
  82 *    1.2.0                    3    10200  3.1.2.0
  83 *    1.2.1beta1-4             3    10201  3.1.2.1beta1-4
  84 *    1.2.1rc1-2               3    10201  3.1.2.1rc1-2
  85 *    1.2.1                    3    10201  3.1.2.1
  86 *    1.2.2beta1-6            12    10202  12.so.0.1.2.2beta1-6
  87 *    1.0.13beta1             10    10013  10.so.0.1.0.13beta1
  88 *    1.0.13rc1               10    10013  10.so.0.1.0.13rc1
  89 *    1.2.2rc1                12    10202  12.so.0.1.2.2rc1
  90 *    1.0.13                  10    10013  10.so.0.1.0.13
  91 *    1.2.2                   12    10202  12.so.0.1.2.2
  92 *    1.2.3rc1-6              12    10203  12.so.0.1.2.3rc1-6
  93 *    1.2.3                   12    10203  12.so.0.1.2.3
  94 *    1.2.4beta1-3            13    10204  12.so.0.1.2.4beta1-3
  95 *    1.0.14rc1               13    10014  10.so.0.1.0.14rc1
  96 *    1.2.4rc1                13    10204  12.so.0.1.2.4rc1
  97 *    1.0.14                  10    10014  10.so.0.1.0.14
  98 *    1.2.4                   13    10204  12.so.0.1.2.4
  99 *    1.2.5beta1-2            13    10205  12.so.0.1.2.5beta1-2
 100 *    1.0.15rc1-3             10    10015  10.so.0.1.0.15rc1-3
 101 *    1.2.5rc1-3              13    10205  12.so.0.1.2.5rc1-3
 102 *    1.0.15                  10    10015  10.so.0.1.0.15
 103 *    1.2.5                   13    10205  12.so.0.1.2.5
 104 *    1.2.6beta1-4            13    10206  12.so.0.1.2.6beta1-4
 105 *    1.0.16                  10    10016  10.so.0.1.0.16
 106 *    1.2.6                   13    10206  12.so.0.1.2.6
 107 *    1.2.7beta1-2            13    10207  12.so.0.1.2.7beta1-2
 108 *    1.0.17rc1               10    10017  12.so.0.1.0.17rc1
 109 *    1.2.7rc1                13    10207  12.so.0.1.2.7rc1
 110 *    1.0.17                  10    10017  12.so.0.1.0.17
 111 *    1.2.7                   13    10207  12.so.0.1.2.7
 112 *    1.2.8beta1-5            13    10208  12.so.0.1.2.8beta1-5
 113 *    1.0.18rc1-5             10    10018  12.so.0.1.0.18rc1-5
 114 *    1.2.8rc1-5              13    10208  12.so.0.1.2.8rc1-5
 115 *    1.0.18                  10    10018  12.so.0.1.0.18
 116 *    1.2.8                   13    10208  12.so.0.1.2.8
 117 *    1.2.9beta1-3            13    10209  12.so.0.1.2.9beta1-3
 118 *    1.2.9beta4-11           13    10209  12.so.0.9[.0]
 119 *    1.2.9rc1                13    10209  12.so.0.9[.0]
 120 *    1.2.9                   13    10209  12.so.0.9[.0]
 121 *    1.2.10beta1-7           13    10210  12.so.0.10[.0]
 122 *    1.2.10rc1-2             13    10210  12.so.0.10[.0]
 123 *    1.2.10                  13    10210  12.so.0.10[.0]
 124 *    1.4.0beta1-5            14    10400  14.so.0.0[.0]
 125 *    1.2.11beta1-4           13    10211  12.so.0.11[.0]
 126 *    1.4.0beta7-8            14    10400  14.so.0.0[.0]
 127 *    1.2.11                  13    10211  12.so.0.11[.0]
 128 *    1.2.12                  13    10212  12.so.0.12[.0]
 129 *    1.4.0beta9-14           14    10400  14.so.0.0[.0]
 130 *    1.2.13                  13    10213  12.so.0.13[.0]
 131 *    1.4.0beta15-36          14    10400  14.so.0.0[.0]
 132 *    1.4.0beta37-87          14    10400  14.so.14.0[.0]
 133 *    1.4.0rc01               14    10400  14.so.14.0[.0]
 134 *    1.4.0beta88-109         14    10400  14.so.14.0[.0]
 135 *    1.4.0rc02-08            14    10400  14.so.14.0[.0]
 136 *    1.4.0                   14    10400  14.so.14.0[.0]
 137 *    1.4.1beta01-03          14    10401  14.so.14.1[.0]
 138 *    1.4.1rc01               14    10401  14.so.14.1[.0]
 139 *    1.4.1beta04-12          14    10401  14.so.14.1[.0]
 140 *    1.4.1                   14    10401  14.so.14.1[.0]
 141 *    1.4.2                   14    10402  14.so.14.2[.0]
 142 *    1.4.3                   14    10403  14.so.14.3[.0]
 143 *    1.4.4                   14    10404  14.so.14.4[.0]
 144 *    1.5.0beta01-58          15    10500  15.so.15.0[.0]
 145 *    1.5.0rc01-07            15    10500  15.so.15.0[.0]
 146 *    1.5.0                   15    10500  15.so.15.0[.0]
 147 *    1.5.1beta01-11          15    10501  15.so.15.1[.0]
 148 *    1.5.1rc01-02            15    10501  15.so.15.1[.0]
 149 *    1.5.1                   15    10501  15.so.15.1[.0]
 150 *    1.5.2beta01-03          15    10502  15.so.15.2[.0]
 151 *    1.5.2rc01-03            15    10502  15.so.15.2[.0]
 152 *    1.5.2                   15    10502  15.so.15.2[.0]
 153 *    1.5.3beta01-10          15    10503  15.so.15.3[.0]
 154 *    1.5.3rc01-02            15    10503  15.so.15.3[.0]
 155 *    1.5.3beta11             15    10503  15.so.15.3[.0]
 156 *    1.5.3 [omitted]
 157 *    1.5.4beta01-08          15    10504  15.so.15.4[.0]
 158 *    1.5.4rc01               15    10504  15.so.15.4[.0]
 159 *    1.5.4                   15    10504  15.so.15.4[.0]
 160 *    1.5.5beta01-08          15    10505  15.so.15.5[.0]
 161 *    1.5.5rc01               15    10505  15.so.15.5[.0]
 162 *    1.5.5                   15    10505  15.so.15.5[.0]
 163 *    1.5.6beta01-07          15    10506  15.so.15.6[.0]
 164 *    1.5.6rc01-03            15    10506  15.so.15.6[.0]
 165 *    1.5.6                   15    10506  15.so.15.6[.0]
 166 *    1.5.7beta01-05          15    10507  15.so.15.7[.0]
 167 *    1.5.7rc01-03            15    10507  15.so.15.7[.0]
 168 *    1.5.7                   15    10507  15.so.15.7[.0]
 169 *    1.5.8beta01             15    10508  15.so.15.8[.0]
 170 *    1.5.8rc01               15    10508  15.so.15.8[.0]
 171 *    1.5.8                   15    10508  15.so.15.8[.0]
 172 *    1.5.9beta01-02          15    10509  15.so.15.9[.0]
 173 *    1.5.9rc01               15    10509  15.so.15.9[.0]
 174 *    1.5.9                   15    10509  15.so.15.9[.0]
 175 *
 176 *   Henceforth the source version will match the shared-library major
 177 *   and minor numbers; the shared-library major version number will be
 178 *   used for changes in backward compatibility, as it is intended.  The
 179 *   PNG_LIBPNG_VER macro, which is not used within libpng but is available
 180 *   for applications, is an unsigned integer of the form xyyzz corresponding
 181 *   to the source version x.y.z (leading zeros in y and z).  Beta versions
 182 *   were given the previous public release number plus a letter, until
 183 *   version 1.0.6j; from then on they were given the upcoming public
 184 *   release number plus "betaNN" or "rcN".
 185 *
 186 *   Binary incompatibility exists only when applications make direct access
 187 *   to the info_ptr or png_ptr members through png.h, and the compiled
 188 *   application is loaded with a different version of the library.
 189 *
 190 *   DLLNUM will change each time there are forward or backward changes
 191 *   in binary compatibility (e.g., when a new feature is added).
 192 *
 193 * See libpng-manual.txt or libpng.3 for more information.  The PNG
 194 * specification is available as a W3C Recommendation and as an ISO
 195 * Specification, <http://www.w3.org/TR/2003/REC-PNG-20031110/
 196 */
 197
 198/*
 199 * COPYRIGHT NOTICE, DISCLAIMER, and LICENSE:
 200 *
 201 * If you modify libpng you may insert additional notices immediately following
 202 * this sentence.
 203 *
 204 * This code is released under the libpng license.
 205 *
 206 * libpng versions 1.2.6, August 15, 2004, through 1.5.9, February 18, 2012, are
 207 * Copyright (c) 2004, 2006-2012 Glenn Randers-Pehrson, and are
 208 * distributed according to the same disclaimer and license as libpng-1.2.5
 209 * with the following individual added to the list of Contributing Authors:
 210 *
 211 *    Cosmin Truta
 212 *
 213 * libpng versions 1.0.7, July 1, 2000, through 1.2.5, October 3, 2002, are
 214 * Copyright (c) 2000-2002 Glenn Randers-Pehrson, and are
 215 * distributed according to the same disclaimer and license as libpng-1.0.6
 216 * with the following individuals added to the list of Contributing Authors:
 217 *
 218 *    Simon-Pierre Cadieux
 219 *    Eric S. Raymond
 220 *    Gilles Vollant
 221 *
 222 * and with the following additions to the disclaimer:
 223 *
 224 *    There is no warranty against interference with your enjoyment of the
 225 *    library or against infringement.  There is no warranty that our
 226 *    efforts or the library will fulfill any of your particular purposes
 227 *    or needs.  This library is provided with all faults, and the entire
 228 *    risk of satisfactory quality, performance, accuracy, and effort is with
 229 *    the user.
 230 *
 231 * libpng versions 0.97, January 1998, through 1.0.6, March 20, 2000, are
 232 * Copyright (c) 1998, 1999, 2000 Glenn Randers-Pehrson, and are
 233 * distributed according to the same disclaimer and license as libpng-0.96,
 234 * with the following individuals added to the list of Contributing Authors:
 235 *
 236 *    Tom Lane
 237 *    Glenn Randers-Pehrson
 238 *    Willem van Schaik
 239 *
 240 * libpng versions 0.89, June 1996, through 0.96, May 1997, are
 241 * Copyright (c) 1996, 1997 Andreas Dilger
 242 * Distributed according to the same disclaimer and license as libpng-0.88,
 243 * with the following individuals added to the list of Contributing Authors:
 244 *
 245 *    John Bowler
 246 *    Kevin Bracey
 247 *    Sam Bushell
 248 *    Magnus Holmgren
 249 *    Greg Roelofs
 250 *    Tom Tanner
 251 *
 252 * libpng versions 0.5, May 1995, through 0.88, January 1996, are
 253 * Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.
 254 *
 255 * For the purposes of this copyright and license, "Contributing Authors"
 256 * is defined as the following set of individuals:
 257 *
 258 *    Andreas Dilger
 259 *    Dave Martindale
 260 *    Guy Eric Schalnat
 261 *    Paul Schmidt
 262 *    Tim Wegner
 263 *
 264 * The PNG Reference Library is supplied "AS IS".  The Contributing Authors
 265 * and Group 42, Inc. disclaim all warranties, expressed or implied,
 266 * including, without limitation, the warranties of merchantability and of
 267 * fitness for any purpose.  The Contributing Authors and Group 42, Inc.
 268 * assume no liability for direct, indirect, incidental, special, exemplary,
 269 * or consequential damages, which may result from the use of the PNG
 270 * Reference Library, even if advised of the possibility of such damage.
 271 *
 272 * Permission is hereby granted to use, copy, modify, and distribute this
 273 * source code, or portions hereof, for any purpose, without fee, subject
 274 * to the following restrictions:
 275 *
 276 *   1. The origin of this source code must not be misrepresented.
 277 *
 278 *   2. Altered versions must be plainly marked as such and must not
 279 *      be misrepresented as being the original source.
 280 *
 281 *   3. This Copyright notice may not be removed or altered from
 282 *      any source or altered source distribution.
 283 *
 284 * The Contributing Authors and Group 42, Inc. specifically permit, without
 285 * fee, and encourage the use of this source code as a component to
 286 * supporting the PNG file format in commercial products.  If you use this
 287 * source code in a product, acknowledgment is not required but would be
 288 * appreciated.
 289 */
 290
 291/*
 292 * A "png_get_copyright" function is available, for convenient use in "about"
 293 * boxes and the like:
 294 *
 295 *     printf("%s", png_get_copyright(NULL));
 296 *
 297 * Also, the PNG logo (in PNG format, of course) is supplied in the
 298 * files "pngbar.png" and "pngbar.jpg (88x31) and "pngnow.png" (98x31).
 299 */
 300
 301/*
 302 * Libpng is OSI Certified Open Source Software.  OSI Certified is a
 303 * certification mark of the Open Source Initiative.
 304 */
 305
 306/*
 307 * The contributing authors would like to thank all those who helped
 308 * with testing, bug fixes, and patience.  This wouldn't have been
 309 * possible without all of you.
 310 *
 311 * Thanks to Frank J. T. Wojcik for helping with the documentation.
 312 */
 313
 314/*
 315 * Y2K compliance in libpng:
 316 * =========================
 317 *
 318 *    February 18, 2012
 319 *
 320 *    Since the PNG Development group is an ad-hoc body, we can't make
 321 *    an official declaration.
 322 *
 323 *    This is your unofficial assurance that libpng from version 0.71 and
 324 *    upward through 1.5.9 are Y2K compliant.  It is my belief that
 325 *    earlier versions were also Y2K compliant.
 326 *
 327 *    Libpng only has two year fields.  One is a 2-byte unsigned integer
 328 *    that will hold years up to 65535.  The other holds the date in text
 329 *    format, and will hold years up to 9999.
 330 *
 331 *    The integer is
 332 *        "png_uint_16 year" in png_time_struct.
 333 *
 334 *    The string is
 335 *        "png_char time_buffer" in png_struct
 336 *
 337 *    There are seven time-related functions:
 338 *        png.c: png_convert_to_rfc_1123() in png.c
 339 *          (formerly png_convert_to_rfc_1152() in error)
 340 *        png_convert_from_struct_tm() in pngwrite.c, called in pngwrite.c
 341 *        png_convert_from_time_t() in pngwrite.c
 342 *        png_get_tIME() in pngget.c
 343 *        png_handle_tIME() in pngrutil.c, called in pngread.c
 344 *        png_set_tIME() in pngset.c
 345 *        png_write_tIME() in pngwutil.c, called in pngwrite.c
 346 *
 347 *    All handle dates properly in a Y2K environment.  The
 348 *    png_convert_from_time_t() function calls gmtime() to convert from system
 349 *    clock time, which returns (year - 1900), which we properly convert to
 350 *    the full 4-digit year.  There is a possibility that applications using
 351 *    libpng are not passing 4-digit years into the png_convert_to_rfc_1123()
 352 *    function, or that they are incorrectly passing only a 2-digit year
 353 *    instead of "year - 1900" into the png_convert_from_struct_tm() function,
 354 *    but this is not under our control.  The libpng documentation has always
 355 *    stated that it works with 4-digit years, and the APIs have been
 356 *    documented as such.
 357 *
 358 *    The tIME chunk itself is also Y2K compliant.  It uses a 2-byte unsigned
 359 *    integer to hold the year, and can hold years as large as 65535.
 360 *
 361 *    zlib, upon which libpng depends, is also Y2K compliant.  It contains
 362 *    no date-related code.
 363 *
 364 *       Glenn Randers-Pehrson
 365 *       libpng maintainer
 366 *       PNG Development Group
 367 */
 368
 369#ifndef PNG_H
 370#define PNG_H
 371
 372/* This is not the place to learn how to use libpng. The file libpng-manual.txt
 373 * describes how to use libpng, and the file example.c summarizes it
 374 * with some code on which to build.  This file is useful for looking
 375 * at the actual function definitions and structure components.
 376 *
 377 * If you just need to read a PNG file and don't want to read the documentation
 378 * skip to the end of this file and read the section entitled 'simplified API'.
 379 */
 380
 381/* Version information for png.h - this should match the version in png.c */
 382#define PNG_LIBPNG_VER_STRING "1.5.9"
 383#define PNG_HEADER_VERSION_STRING \
 384     " libpng version 1.5.9 - February 18, 2012\n"
 385
 386#define PNG_LIBPNG_VER_SONUM   15
 387#define PNG_LIBPNG_VER_DLLNUM  15
 388
 389/* These should match the first 3 components of PNG_LIBPNG_VER_STRING: */
 390#define PNG_LIBPNG_VER_MAJOR   1
 391#define PNG_LIBPNG_VER_MINOR   5
 392#define PNG_LIBPNG_VER_RELEASE 9
 393
 394/* This should match the numeric part of the final component of
 395 * PNG_LIBPNG_VER_STRING, omitting any leading zero:
 396 */
 397
 398#define PNG_LIBPNG_VER_BUILD  0
 399
 400/* Release Status */
 401#define PNG_LIBPNG_BUILD_ALPHA    1
 402#define PNG_LIBPNG_BUILD_BETA     2
 403#define PNG_LIBPNG_BUILD_RC       3
 404#define PNG_LIBPNG_BUILD_STABLE   4
 405#define PNG_LIBPNG_BUILD_RELEASE_STATUS_MASK 7
 406
 407/* Release-Specific Flags */
 408#define PNG_LIBPNG_BUILD_PATCH    8 /* Can be OR'ed with
 409                                       PNG_LIBPNG_BUILD_STABLE only */
 410#define PNG_LIBPNG_BUILD_PRIVATE 16 /* Cannot be OR'ed with
 411                                       PNG_LIBPNG_BUILD_SPECIAL */
 412#define PNG_LIBPNG_BUILD_SPECIAL 32 /* Cannot be OR'ed with
 413                                       PNG_LIBPNG_BUILD_PRIVATE */
 414
 415#define PNG_LIBPNG_BUILD_BASE_TYPE PNG_LIBPNG_BUILD_BETA
 416
 417/* Careful here.  At one time, Guy wanted to use 082, but that would be octal.
 418 * We must not include leading zeros.
 419 * Versions 0.7 through 1.0.0 were in the range 0 to 100 here (only
 420 * version 1.0.0 was mis-numbered 100 instead of 10000).  From
 421 * version 1.0.1 it's    xxyyzz, where x=major, y=minor, z=release
 422 */
 423#define PNG_LIBPNG_VER 10509 /* 1.5.9 */
 424
 425/* Library configuration: these options cannot be changed after
 426 * the library has been built.
 427 */
 428#ifndef PNGLCONF_H
 429    /* If pnglibconf.h is missing, you can
 430     * copy scripts/pnglibconf.h.prebuilt to pnglibconf.h
 431     */
 432#   include "pnglibconf.h"
 433#endif
 434
 435#ifndef PNG_VERSION_INFO_ONLY
 436#  ifndef PNG_BUILDING_SYMBOL_TABLE
 437  /*
 438   *   Standard header files (not needed for the version info or while
 439   *   building symbol table -- see scripts/pnglibconf.dfa)
 440   */
 441#    ifdef PNG_SETJMP_SUPPORTED
 442#      include <setjmp.h>
 443#    endif
 444
 445    /* Need the time information for converting tIME chunks, it
 446     * defines struct tm:
 447     */
 448#    ifdef PNG_CONVERT_tIME_SUPPORTED
 449       /* "time.h" functions are not supported on all operating systems */
 450#      include <time.h>
 451#    endif
 452#  endif
 453
 454/* Machine specific configuration. */
 455#  include "pngconf.h"
 456#endif
 457
 458/*
 459 * Added at libpng-1.2.8
 460 *
 461 * Ref MSDN: Private as priority over Special
 462 * VS_FF_PRIVATEBUILD File *was not* built using standard release
 463 * procedures. If this value is given, the StringFileInfo block must
 464 * contain a PrivateBuild string.
 465 *
 466 * VS_FF_SPECIALBUILD File *was* built by the original company using
 467 * standard release procedures but is a variation of the standard
 468 * file of the same version number. If this value is given, the
 469 * StringFileInfo block must contain a SpecialBuild string.
 470 */
 471
 472#ifdef PNG_USER_PRIVATEBUILD /* From pnglibconf.h */
 473#  define PNG_LIBPNG_BUILD_TYPE \
 474       (PNG_LIBPNG_BUILD_BASE_TYPE | PNG_LIBPNG_BUILD_PRIVATE)
 475#else
 476#  ifdef PNG_LIBPNG_SPECIALBUILD
 477#    define PNG_LIBPNG_BUILD_TYPE \
 478         (PNG_LIBPNG_BUILD_BASE_TYPE | PNG_LIBPNG_BUILD_SPECIAL)
 479#  else
 480#    define PNG_LIBPNG_BUILD_TYPE (PNG_LIBPNG_BUILD_BASE_TYPE)
 481#  endif
 482#endif
 483
 484#ifndef PNG_VERSION_INFO_ONLY
 485
 486/* Inhibit C++ name-mangling for libpng functions but not for system calls. */
 487#ifdef __cplusplus
 488extern "C" {
 489#endif /* __cplusplus */
 490
 491/* Version information for C files, stored in png.c.  This had better match
 492 * the version above.
 493 */
 494#define png_libpng_ver png_get_header_ver(NULL)
 495
 496/* This file is arranged in several sections:
 497 *
 498 * 1. Any configuration options that can be specified by for the application
 499 *    code when it is built.  (Build time configuration is in pnglibconf.h)
 500 * 2. Type definitions (base types are defined in pngconf.h), structure
 501 *    definitions.
 502 * 3. Exported library functions.
 503 *
 504 * The library source code has additional files (principally pngpriv.h) that
 505 * allow configuration of the library.
 506 */
 507/* Section 1: run time configuration
 508 * See pnglibconf.h for build time configuration
 509 *
 510 * Run time configuration allows the application to choose between
 511 * implementations of certain arithmetic APIs.  The default is set
 512 * at build time and recorded in pnglibconf.h, but it is safe to
 513 * override these (and only these) settings.  Note that this won't
 514 * change what the library does, only application code, and the
 515 * settings can (and probably should) be made on a per-file basis
 516 * by setting the #defines before including png.h
 517 *
 518 * Use macros to read integers from PNG data or use the exported
 519 * functions?
 520 *   PNG_USE_READ_MACROS: use the macros (see below)  Note that
 521 *     the macros evaluate their argument multiple times.
 522 *   PNG_NO_USE_READ_MACROS: call the relevant library function.
 523 *
 524 * Use the alternative algorithm for compositing alpha samples that
 525 * does not use division?
 526 *   PNG_READ_COMPOSITE_NODIV_SUPPORTED: use the 'no division'
 527 *      algorithm.
 528 *   PNG_NO_READ_COMPOSITE_NODIV: use the 'division' algorithm.
 529 *
 530 * How to handle benign errors if PNG_ALLOW_BENIGN_ERRORS is
 531 * false?
 532 *   PNG_ALLOW_BENIGN_ERRORS: map calls to the benign error
 533 *      APIs to png_warning.
 534 * Otherwise the calls are mapped to png_error.
 535 */
 536
 537/* Section 2: type definitions, including structures and compile time
 538 * constants.
 539 * See pngconf.h for base types that vary by machine/system
 540 */
 541
 542/* This triggers a compiler error in png.c, if png.c and png.h
 543 * do not agree upon the version number.
 544 */
 545typedef char* png_libpng_version_1_5_9;
 546
 547/* Three color definitions.  The order of the red, green, and blue, (and the
 548 * exact size) is not important, although the size of the fields need to
 549 * be png_byte or png_uint_16 (as defined below).
 550 */
 551typedef struct png_color_struct
 552{
 553   png_byte red;
 554   png_byte green;
 555   png_byte blue;
 556} png_color;
 557typedef png_color FAR * png_colorp;
 558typedef PNG_CONST png_color FAR * png_const_colorp;
 559typedef png_color FAR * FAR * png_colorpp;
 560
 561typedef struct png_color_16_struct
 562{
 563   png_byte index;    /* used for palette files */
 564   png_uint_16 red;   /* for use in red green blue files */
 565   png_uint_16 green;
 566   png_uint_16 blue;
 567   png_uint_16 gray;  /* for use in grayscale files */
 568} png_color_16;
 569typedef png_color_16 FAR * png_color_16p;
 570typedef PNG_CONST png_color_16 FAR * png_const_color_16p;
 571typedef png_color_16 FAR * FAR * png_color_16pp;
 572
 573typedef struct png_color_8_struct
 574{
 575   png_byte red;   /* for use in red green blue files */
 576   png_byte green;
 577   png_byte blue;
 578   png_byte gray;  /* for use in grayscale files */
 579   png_byte alpha; /* for alpha channel files */
 580} png_color_8;
 581typedef png_color_8 FAR * png_color_8p;
 582typedef PNG_CONST png_color_8 FAR * png_const_color_8p;
 583typedef png_color_8 FAR * FAR * png_color_8pp;
 584
 585/*
 586 * The following two structures are used for the in-core representation
 587 * of sPLT chunks.
 588 */
 589typedef struct png_sPLT_entry_struct
 590{
 591   png_uint_16 red;
 592   png_uint_16 green;
 593   png_uint_16 blue;
 594   png_uint_16 alpha;
 595   png_uint_16 frequency;
 596} png_sPLT_entry;
 597typedef png_sPLT_entry FAR * png_sPLT_entryp;
 598typedef PNG_CONST png_sPLT_entry FAR * png_const_sPLT_entryp;
 599typedef png_sPLT_entry FAR * FAR * png_sPLT_entrypp;
 600
 601/*  When the depth of the sPLT palette is 8 bits, the color and alpha samples
 602 *  occupy the LSB of their respective members, and the MSB of each member
 603 *  is zero-filled.  The frequency member always occupies the full 16 bits.
 604 */
 605
 606typedef struct png_sPLT_struct
 607{
 608   png_charp name;           /* palette name */
 609   png_byte depth;           /* depth of palette samples */
 610   png_sPLT_entryp entries;  /* palette entries */
 611   png_int_32 nentries;      /* number of palette entries */
 612} png_sPLT_t;
 613typedef png_sPLT_t FAR * png_sPLT_tp;
 614typedef PNG_CONST png_sPLT_t FAR * png_const_sPLT_tp;
 615typedef png_sPLT_t FAR * FAR * png_sPLT_tpp;
 616
 617#ifdef PNG_TEXT_SUPPORTED
 618/* png_text holds the contents of a text/ztxt/itxt chunk in a PNG file,
 619 * and whether that contents is compressed or not.  The "key" field
 620 * points to a regular zero-terminated C string.  The "text" fields can be a
 621 * regular C string, an empty string, or a NULL pointer.
 622 * However, the structure returned by png_get_text() will always contain
 623 * the "text" field as a regular zero-terminated C string (possibly
 624 * empty), never a NULL pointer, so it can be safely used in printf() and
 625 * other string-handling functions.  Note that the "itxt_length", "lang", and
 626 * "lang_key" members of the structure only exist when the library is built
 627 * with iTXt chunk support.  Prior to libpng-1.4.0 the library was built by
 628 * default without iTXt support. Also note that when iTXt *is* supported,
 629 * the "lang" and "lang_key" fields contain NULL pointers when the
 630 * "compression" field contains * PNG_TEXT_COMPRESSION_NONE or
 631 * PNG_TEXT_COMPRESSION_zTXt. Note that the "compression value" is not the
 632 * same as what appears in the PNG tEXt/zTXt/iTXt chunk's "compression flag"
 633 * which is always 0 or 1, or its "compression method" which is always 0.
 634 */
 635typedef struct png_text_struct
 636{
 637   int  compression;       /* compression value:
 638                             -1: tEXt, none
 639                              0: zTXt, deflate
 640                              1: iTXt, none
 641                              2: iTXt, deflate  */
 642   png_charp key;          /* keyword, 1-79 character description of "text" */
 643   png_charp text;         /* comment, may be an empty string (ie "")
 644                              or a NULL pointer */
 645   png_size_t text_length; /* length of the text string */
 646   png_size_t itxt_length; /* length of the itxt string */
 647   png_charp lang;         /* language code, 0-79 characters
 648                              or a NULL pointer */
 649   png_charp lang_key;     /* keyword translated UTF-8 string, 0 or more
 650                              chars or a NULL pointer */
 651} png_text;
 652typedef png_text FAR * png_textp;
 653typedef PNG_CONST png_text FAR * png_const_textp;
 654typedef png_text FAR * FAR * png_textpp;
 655#endif
 656
 657/* Supported compression types for text in PNG files (tEXt, and zTXt).
 658 * The values of the PNG_TEXT_COMPRESSION_ defines should NOT be changed. */
 659#define PNG_TEXT_COMPRESSION_NONE_WR -3
 660#define PNG_TEXT_COMPRESSION_zTXt_WR -2
 661#define PNG_TEXT_COMPRESSION_NONE    -1
 662#define PNG_TEXT_COMPRESSION_zTXt     0
 663#define PNG_ITXT_COMPRESSION_NONE     1
 664#define PNG_ITXT_COMPRESSION_zTXt     2
 665#define PNG_TEXT_COMPRESSION_LAST     3  /* Not a valid value */
 666
 667/* png_time is a way to hold the time in an machine independent way.
 668 * Two conversions are provided, both from time_t and struct tm.  There
 669 * is no portable way to convert to either of these structures, as far
 670 * as I know.  If you know of a portable way, send it to me.  As a side
 671 * note - PNG has always been Year 2000 compliant!
 672 */
 673typedef struct png_time_struct
 674{
 675   png_uint_16 year; /* full year, as in, 1995 */
 676   png_byte month;   /* month of year, 1 - 12 */
 677   png_byte day;     /* day of month, 1 - 31 */
 678   png_byte hour;    /* hour of day, 0 - 23 */
 679   png_byte minute;  /* minute of hour, 0 - 59 */
 680   png_byte second;  /* second of minute, 0 - 60 (for leap seconds) */
 681} png_time;
 682typedef png_time FAR * png_timep;
 683typedef PNG_CONST png_time FAR * png_const_timep;
 684typedef png_time FAR * FAR * png_timepp;
 685
 686#if defined(PNG_UNKNOWN_CHUNKS_SUPPORTED) || \
 687    defined(PNG_HANDLE_AS_UNKNOWN_SUPPORTED)
 688/* png_unknown_chunk is a structure to hold queued chunks for which there is
 689 * no specific support.  The idea is that we can use this to queue
 690 * up private chunks for output even though the library doesn't actually
 691 * know about their semantics.
 692 */
 693typedef struct png_unknown_chunk_t
 694{
 695    png_byte name[5];
 696    png_byte *data;
 697    png_size_t size;
 698
 699    /* libpng-using applications should NOT directly modify this byte. */
 700    png_byte location; /* mode of operation at read time */
 701}
 702
 703
 704png_unknown_chunk;
 705typedef png_unknown_chunk FAR * png_unknown_chunkp;
 706typedef PNG_CONST png_unknown_chunk FAR * png_const_unknown_chunkp;
 707typedef png_unknown_chunk FAR * FAR * png_unknown_chunkpp;
 708#endif
 709
 710/* Values for the unknown chunk location byte */
 711
 712#define PNG_HAVE_IHDR  0x01
 713#define PNG_HAVE_PLTE  0x02
 714#define PNG_AFTER_IDAT 0x08
 715
 716/* The complete definition of png_info has, as of libpng-1.5.0,
 717 * been moved into a separate header file that is not accessible to
 718 * applications.  Read libpng-manual.txt or libpng.3 for more info.
 719 */
 720typedef struct png_info_def png_info;
 721typedef png_info FAR * png_infop;
 722typedef PNG_CONST png_info FAR * png_const_infop;
 723typedef png_info FAR * FAR * png_infopp;
 724
 725/* Maximum positive integer used in PNG is (2^31)-1 */
 726#define PNG_UINT_31_MAX ((png_uint_32)0x7fffffffL)
 727#define PNG_UINT_32_MAX ((png_uint_32)(-1))
 728#define PNG_SIZE_MAX ((png_size_t)(-1))
 729
 730/* These are constants for fixed point values encoded in the
 731 * PNG specification manner (x100000)
 732 */
 733#define PNG_FP_1    100000
 734#define PNG_FP_HALF  50000
 735#define PNG_FP_MAX  ((png_fixed_point)0x7fffffffL)
 736#define PNG_FP_MIN  (-PNG_FP_MAX)
 737
 738/* These describe the color_type field in png_info. */
 739/* color type masks */
 740#define PNG_COLOR_MASK_PALETTE    1
 741#define PNG_COLOR_MASK_COLOR      2
 742#define PNG_COLOR_MASK_ALPHA      4
 743
 744/* color types.  Note that not all combinations are legal */
 745#define PNG_COLOR_TYPE_GRAY 0
 746#define PNG_COLOR_TYPE_PALETTE  (PNG_COLOR_MASK_COLOR | PNG_COLOR_MASK_PALETTE)
 747#define PNG_COLOR_TYPE_RGB        (PNG_COLOR_MASK_COLOR)
 748#define PNG_COLOR_TYPE_RGB_ALPHA  (PNG_COLOR_MASK_COLOR | PNG_COLOR_MASK_ALPHA)
 749#define PNG_COLOR_TYPE_GRAY_ALPHA (PNG_COLOR_MASK_ALPHA)
 750/* aliases */
 751#define PNG_COLOR_TYPE_RGBA  PNG_COLOR_TYPE_RGB_ALPHA
 752#define PNG_COLOR_TYPE_GA  PNG_COLOR_TYPE_GRAY_ALPHA
 753
 754/* This is for compression type. PNG 1.0-1.2 only define the single type. */
 755#define PNG_COMPRESSION_TYPE_BASE 0 /* Deflate method 8, 32K window */
 756#define PNG_COMPRESSION_TYPE_DEFAULT PNG_COMPRESSION_TYPE_BASE
 757
 758/* This is for filter type. PNG 1.0-1.2 only define the single type. */
 759#define PNG_FILTER_TYPE_BASE      0 /* Single row per-byte filtering */
 760#define PNG_INTRAPIXEL_DIFFERENCING 64 /* Used only in MNG datastreams */
 761#define PNG_FILTER_TYPE_DEFAULT   PNG_FILTER_TYPE_BASE
 762
 763/* These are for the interlacing type.  These values should NOT be changed. */
 764#define PNG_INTERLACE_NONE        0 /* Non-interlaced image */
 765#define PNG_INTERLACE_ADAM7       1 /* Adam7 interlacing */
 766#define PNG_INTERLACE_LAST        2 /* Not a valid value */
 767
 768/* These are for the oFFs chunk.  These values should NOT be changed. */
 769#define PNG_OFFSET_PIXEL          0 /* Offset in pixels */
 770#define PNG_OFFSET_MICROMETER     1 /* Offset in micrometers (1/10^6 meter) */
 771#define PNG_OFFSET_LAST           2 /* Not a valid value */
 772
 773/* These are for the pCAL chunk.  These values should NOT be changed. */
 774#define PNG_EQUATION_LINEAR       0 /* Linear transformation */
 775#define PNG_EQUATION_BASE_E       1 /* Exponential base e transform */
 776#define PNG_EQUATION_ARBITRARY    2 /* Arbitrary base exponential transform */
 777#define PNG_EQUATION_HYPERBOLIC   3 /* Hyperbolic sine transformation */
 778#define PNG_EQUATION_LAST         4 /* Not a valid value */
 779
 780/* These are for the sCAL chunk.  These values should NOT be changed. */
 781#define PNG_SCALE_UNKNOWN         0 /* unknown unit (image scale) */
 782#define PNG_SCALE_METER           1 /* meters per pixel */
 783#define PNG_SCALE_RADIAN          2 /* radians per pixel */
 784#define PNG_SCALE_LAST            3 /* Not a valid value */
 785
 786/* These are for the pHYs chunk.  These values should NOT be changed. */
 787#define PNG_RESOLUTION_UNKNOWN    0 /* pixels/unknown unit (aspect ratio) */
 788#define PNG_RESOLUTION_METER      1 /* pixels/meter */
 789#define PNG_RESOLUTION_LAST       2 /* Not a valid value */
 790
 791/* These are for the sRGB chunk.  These values should NOT be changed. */
 792#define PNG_sRGB_INTENT_PERCEPTUAL 0
 793#define PNG_sRGB_INTENT_RELATIVE   1
 794#define PNG_sRGB_INTENT_SATURATION 2
 795#define PNG_sRGB_INTENT_ABSOLUTE   3
 796#define PNG_sRGB_INTENT_LAST       4 /* Not a valid value */
 797
 798/* This is for text chunks */
 799#define PNG_KEYWORD_MAX_LENGTH     79
 800
 801/* Maximum number of entries in PLTE/sPLT/tRNS arrays */
 802#define PNG_MAX_PALETTE_LENGTH    256
 803
 804/* These determine if an ancillary chunk's data has been successfully read
 805 * from the PNG header, or if the application has filled in the corresponding
 806 * data in the info_struct to be written into the output file.  The values
 807 * of the PNG_INFO_<chunk> defines should NOT be changed.
 808 */
 809#define PNG_INFO_gAMA 0x0001
 810#define PNG_INFO_sBIT 0x0002
 811#define PNG_INFO_cHRM 0x0004
 812#define PNG_INFO_PLTE 0x0008
 813#define PNG_INFO_tRNS 0x0010
 814#define PNG_INFO_bKGD 0x0020
 815#define PNG_INFO_hIST 0x0040
 816#define PNG_INFO_pHYs 0x0080
 817#define PNG_INFO_oFFs 0x0100
 818#define PNG_INFO_tIME 0x0200
 819#define PNG_INFO_pCAL 0x0400
 820#define PNG_INFO_sRGB 0x0800   /* GR-P, 0.96a */
 821#define PNG_INFO_iCCP 0x1000   /* ESR, 1.0.6 */
 822#define PNG_INFO_sPLT 0x2000   /* ESR, 1.0.6 */
 823#define PNG_INFO_sCAL 0x4000   /* ESR, 1.0.6 */
 824#define PNG_INFO_IDAT 0x8000   /* ESR, 1.0.6 */
 825
 826/* This is used for the transformation routines, as some of them
 827 * change these values for the row.  It also should enable using
 828 * the routines for other purposes.
 829 */
 830typedef struct png_row_info_struct
 831{
 832   png_uint_32 width;    /* width of row */
 833   png_size_t rowbytes;  /* number of bytes in row */
 834   png_byte color_type;  /* color type of row */
 835   png_byte bit_depth;   /* bit depth of row */
 836   png_byte channels;    /* number of channels (1, 2, 3, or 4) */
 837   png_byte pixel_depth; /* bits per pixel (depth * channels) */
 838} png_row_info;
 839
 840typedef png_row_info FAR * png_row_infop;
 841typedef png_row_info FAR * FAR * png_row_infopp;
 842
 843/* The complete definition of png_struct has, as of libpng-1.5.0,
 844 * been moved into a separate header file that is not accessible to
 845 * applications.  Read libpng-manual.txt or libpng.3 for more info.
 846 */
 847typedef struct png_struct_def png_struct;
 848typedef PNG_CONST png_struct FAR * png_const_structp;
 849typedef png_struct FAR * png_structp;
 850
 851/* These are the function types for the I/O functions and for the functions
 852 * that allow the user to override the default I/O functions with his or her
 853 * own.  The png_error_ptr type should match that of user-supplied warning
 854 * and error functions, while the png_rw_ptr type should match that of the
 855 * user read/write data functions.  Note that the 'write' function must not
 856 * modify the buffer it is passed. The 'read' function, on the other hand, is
 857 * expected to return the read data in the buffer.
 858 */
 859typedef PNG_CALLBACK(void, *png_error_ptr, (png_structp, png_const_charp));
 860typedef PNG_CALLBACK(void, *png_rw_ptr, (png_structp, png_bytep, png_size_t));
 861typedef PNG_CALLBACK(void, *png_flush_ptr, (png_structp));
 862typedef PNG_CALLBACK(void, *png_read_status_ptr, (png_structp, png_uint_32,
 863    int));
 864typedef PNG_CALLBACK(void, *png_write_status_ptr, (png_structp, png_uint_32,
 865    int));
 866
 867#ifdef PNG_PROGRESSIVE_READ_SUPPORTED
 868typedef PNG_CALLBACK(void, *png_progressive_info_ptr, (png_structp, png_infop));
 869typedef PNG_CALLBACK(void, *png_progressive_end_ptr, (png_structp, png_infop));
 870
 871/* The following callback receives png_uint_32 row_number, int pass for the
 872 * png_bytep data of the row.  When transforming an interlaced image the
 873 * row number is the row number within the sub-image of the interlace pass, so
 874 * the value will increase to the height of the sub-image (not the full image)
 875 * then reset to 0 for the next pass.
 876 *
 877 * Use PNG_ROW_FROM_PASS_ROW(row, pass) and PNG_COL_FROM_PASS_COL(col, pass) to
 878 * find the output pixel (x,y) given an interlaced sub-image pixel
 879 * (row,col,pass).  (See below for these macros.)
 880 */
 881typedef PNG_CALLBACK(void, *png_progressive_row_ptr, (png_structp, png_bytep,
 882    png_uint_32, int));
 883#endif
 884
 885#if defined(PNG_READ_USER_TRANSFORM_SUPPORTED) || \
 886    defined(PNG_WRITE_USER_TRANSFORM_SUPPORTED)
 887typedef PNG_CALLBACK(void, *png_user_transform_ptr, (png_structp, png_row_infop,
 888    png_bytep));
 889#endif
 890
 891#ifdef PNG_USER_CHUNKS_SUPPORTED
 892typedef PNG_CALLBACK(int, *png_user_chunk_ptr, (png_structp,
 893    png_unknown_chunkp));
 894#endif
 895#ifdef PNG_UNKNOWN_CHUNKS_SUPPORTED
 896typedef PNG_CALLBACK(void, *png_unknown_chunk_ptr, (png_structp));
 897#endif
 898
 899#ifdef PNG_SETJMP_SUPPORTED
 900/* This must match the function definition in <setjmp.h>, and the application
 901 * must include this before png.h to obtain the definition of jmp_buf.  The
 902 * function is required to be PNG_NORETURN, but this is not checked.  If the
 903 * function does return the application will crash via an abort() or similar
 904 * system level call.
 905 *
 906 * If you get a warning here while building the library you may need to make
 907 * changes to ensure that pnglibconf.h records the calling convention used by
 908 * your compiler.  This may be very difficult - try using a different compiler
 909 * to build the library!
 910 */
 911PNG_FUNCTION(void, (PNGCAPI *png_longjmp_ptr), PNGARG((jmp_buf, int)), typedef);
 912#endif
 913
 914/* Transform masks for the high-level interface */
 915#define PNG_TRANSFORM_IDENTITY       0x0000    /* read and write */
 916#define PNG_TRANSFORM_STRIP_16       0x0001    /* read only */
 917#define PNG_TRANSFORM_STRIP_ALPHA    0x0002    /* read only */
 918#define PNG_TRANSFORM_PACKING        0x0004    /* read and write */
 919#define PNG_TRANSFORM_PACKSWAP       0x0008    /* read and write */
 920#define PNG_TRANSFORM_EXPAND         0x0010    /* read only */
 921#define PNG_TRANSFORM_INVERT_MONO    0x0020    /* read and write */
 922#define PNG_TRANSFORM_SHIFT          0x0040    /* read and write */
 923#define PNG_TRANSFORM_BGR            0x0080    /* read and write */
 924#define PNG_TRANSFORM_SWAP_ALPHA     0x0100    /* read and write */
 925#define PNG_TRANSFORM_SWAP_ENDIAN    0x0200    /* read and write */
 926#define PNG_TRANSFORM_INVERT_ALPHA   0x0400    /* read and write */
 927#define PNG_TRANSFORM_STRIP_FILLER   0x0800    /* write only */
 928/* Added to libpng-1.2.34 */
 929#define PNG_TRANSFORM_STRIP_FILLER_BEFORE PNG_TRANSFORM_STRIP_FILLER
 930#define PNG_TRANSFORM_STRIP_FILLER_AFTER 0x1000 /* write only */
 931/* Added to libpng-1.4.0 */
 932#define PNG_TRANSFORM_GRAY_TO_RGB   0x2000      /* read only */
 933/* Added to libpng-1.5.4 */
 934#define PNG_TRANSFORM_EXPAND_16     0x4000      /* read only */
 935#define PNG_TRANSFORM_SCALE_16      0x8000      /* read only */
 936
 937/* Flags for MNG supported features */
 938#define PNG_FLAG_MNG_EMPTY_PLTE     0x01
 939#define PNG_FLAG_MNG_FILTER_64      0x04
 940#define PNG_ALL_MNG_FEATURES        0x05
 941
 942/* NOTE: prior to 1.5 these functions had no 'API' style declaration,
 943 * this allowed the zlib default functions to be used on Windows
 944 * platforms.  In 1.5 the zlib default malloc (which just calls malloc and
 945 * ignores the first argument) should be completely compatible with the
 946 * following.
 947 */
 948typedef PNG_CALLBACK(png_voidp, *png_malloc_ptr, (png_structp,
 949    png_alloc_size_t));
 950typedef PNG_CALLBACK(void, *png_free_ptr, (png_structp, png_voidp));
 951
 952typedef png_struct FAR * FAR * png_structpp;
 953
 954/* Section 3: exported functions
 955 * Here are the function definitions most commonly used.  This is not
 956 * the place to find out how to use libpng.  See libpng-manual.txt for the
 957 * full explanation, see example.c for the summary.  This just provides
 958 * a simple one line description of the use of each function.
 959 *
 960 * The PNG_EXPORT() and PNG_EXPORTA() macros used below are defined in
 961 * pngconf.h and in the *.dfn files in the scripts directory.
 962 *
 963 *   PNG_EXPORT(ordinal, type, name, (args));
 964 *
 965 *       ordinal:    ordinal that is used while building
 966 *                   *.def files. The ordinal value is only
 967 *                   relevant when preprocessing png.h with
 968 *                   the *.dfn files for building symbol table
 969 *                   entries, and are removed by pngconf.h.
 970 *       type:       return type of the function
 971 *       name:       function name
 972 *       args:       function arguments, with types
 973 *
 974 * When we wish to append attributes to a function prototype we use
 975 * the PNG_EXPORTA() macro instead.
 976 *
 977 *   PNG_EXPORTA(ordinal, type, name, (args), attributes);
 978 *
 979 *       ordinal, type, name, and args: same as in PNG_EXPORT().
 980 *       attributes: function attributes
 981 */
 982
 983/* Returns the version number of the library */
 984PNG_EXPORT(1, png_uint_32, png_access_version_number, (void));
 985
 986/* Tell lib we have already handled the first <num_bytes> magic bytes.
 987 * Handling more than 8 bytes from the beginning of the file is an error.
 988 */
 989PNG_EXPORT(2, void, png_set_sig_bytes, (png_structp png_ptr, int num_bytes));
 990
 991/* Check sig[start] through sig[start + num_to_check - 1] to see if it's a
 992 * PNG file.  Returns zero if the supplied bytes match the 8-byte PNG
 993 * signature, and non-zero otherwise.  Having num_to_check == 0 or
 994 * start > 7 will always fail (ie return non-zero).
 995 */
 996PNG_EXPORT(3, int, png_sig_cmp, (png_const_bytep sig, png_size_t start,
 997    png_size_t num_to_check));
 998
 999/* Simple signature checking function.  This is the same as calling
1000 * png_check_sig(sig, n) := !png_sig_cmp(sig, 0, n).
1001 */
1002#define png_check_sig(sig, n) !png_sig_cmp((sig), 0, (n))
1003
1004/* Allocate and initialize png_ptr struct for reading, and any other memory. */
1005PNG_EXPORTA(4, png_structp, png_create_read_struct,
1006    (png_const_charp user_png_ver, png_voidp error_ptr,
1007    png_error_ptr error_fn, png_error_ptr warn_fn),
1008    PNG_ALLOCATED);
1009
1010/* Allocate and initialize png_ptr struct for writing, and any other memory */
1011PNG_EXPORTA(5, png_structp, png_create_write_struct,
1012    (png_const_charp user_png_ver, png_voidp error_ptr, png_error_ptr error_fn,
1013    png_error_ptr warn_fn),
1014    PNG_ALLOCATED);
1015
1016PNG_EXPORT(6, png_size_t, png_get_compression_buffer_size,
1017    (png_const_structp png_ptr));
1018
1019PNG_EXPORT(7, void, png_set_compression_buffer_size, (png_structp png_ptr,
1020    png_size_t size));
1021
1022/* Moved from pngconf.h in 1.4.0 and modified to ensure setjmp/longjmp
1023 * match up.
1024 */
1025#ifdef PNG_SETJMP_SUPPORTED
1026/* This function returns the jmp_buf built in to *png_ptr.  It must be
1027 * supplied with an appropriate 'longjmp' function to use on that jmp_buf
1028 * unless the default error function is overridden in which case NULL is
1029 * acceptable.  The size of the jmp_buf is checked against the actual size
1030 * allocated by the library - the call will return NULL on a mismatch
1031 * indicating an ABI mismatch.
1032 */
1033PNG_EXPORT(8, jmp_buf*, png_set_longjmp_fn, (png_structp png_ptr,
1034    png_longjmp_ptr longjmp_fn, size_t jmp_buf_size));
1035#  define png_jmpbuf(png_ptr) \
1036      (*png_set_longjmp_fn((png_ptr), longjmp, sizeof (jmp_buf)))
1037#else
1038#  define png_jmpbuf(png_ptr) \
1039      (LIBPNG_WAS_COMPILED_WITH__PNG_NO_SETJMP)
1040#endif
1041/* This function should be used by libpng applications in place of
1042 * longjmp(png_ptr->jmpbuf, val).  If longjmp_fn() has been set, it
1043 * will use it; otherwise it will call PNG_ABORT().  This function was
1044 * added in libpng-1.5.0.
1045 */
1046PNG_EXPORTA(9, void, png_longjmp, (png_structp png_ptr, int val),
1047    PNG_NORETURN);
1048
1049#ifdef PNG_READ_SUPPORTED
1050/* Reset the compression stream */
1051PNG_EXPORT(10, int, png_reset_zstream, (png_structp png_ptr));
1052#endif
1053
1054/* New functions added in libpng-1.0.2 (not enabled by default until 1.2.0) */
1055#ifdef PNG_USER_MEM_SUPPORTED
1056PNG_EXPORTA(11, png_structp, png_create_read_struct_2,
1057    (png_const_charp user_png_ver, png_voidp error_ptr, png_error_ptr error_fn,
1058    png_error_ptr warn_fn,
1059    png_voidp mem_ptr, png_malloc_ptr malloc_fn, png_free_ptr free_fn),
1060    PNG_ALLOCATED);
1061PNG_EXPORTA(12, png_structp, png_create_write_struct_2,
1062    (png_const_charp user_png_ver, png_voidp error_ptr, png_error_ptr error_fn,
1063    png_error_ptr warn_fn,
1064    png_voidp mem_ptr, png_malloc_ptr malloc_fn, png_free_ptr free_fn),
1065    PNG_ALLOCATED);
1066#endif
1067
1068/* Write the PNG file signature. */
1069PNG_EXPORT(13, void, png_write_sig, (png_structp png_ptr));
1070
1071/* Write a PNG chunk - size, type, (optional) data, CRC. */
1072PNG_EXPORT(14, void, png_write_chunk, (png_structp png_ptr, png_const_bytep
1073    chunk_name, png_const_bytep data, png_size_t length));
1074
1075/* Write the start of a PNG chunk - length and chunk name. */
1076PNG_EXPORT(15, void, png_write_chunk_start, (png_structp png_ptr,
1077    png_const_bytep chunk_name, png_uint_32 length));
1078
1079/* Write the data of a PNG chunk started with png_write_chunk_start(). */
1080PNG_EXPORT(16, void, png_write_chunk_data, (png_structp png_ptr,
1081    png_const_bytep data, png_size_t length));
1082
1083/* Finish a chunk started with png_write_chunk_start() (includes CRC). */
1084PNG_EXPORT(17, void, png_write_chunk_end, (png_structp png_ptr));
1085
1086/* Allocate and initialize the info structure */
1087PNG_EXPORTA(18, png_infop, png_create_info_struct, (png_structp png_ptr),
1088    PNG_ALLOCATED);
1089
1090PNG_EXPORT(19, void, png_info_init_3, (png_infopp info_ptr,
1091    png_size_t png_info_struct_size));
1092
1093/* Writes all the PNG information before the image. */
1094PNG_EXPORT(20, void, png_write_info_before_PLTE,
1095    (png_structp png_ptr, png_infop info_ptr));
1096PNG_EXPORT(21, void, png_write_info,
1097    (png_structp png_ptr, png_infop info_ptr));
1098
1099#ifdef PNG_SEQUENTIAL_READ_SUPPORTED
1100/* Read the information before the actual image data. */
1101PNG_EXPORT(22, void, png_read_info,
1102    (png_structp png_ptr, png_infop info_ptr));
1103#endif
1104
1105#ifdef PNG_TIME_RFC1123_SUPPORTED
1106PNG_EXPORT(23, png_const_charp, png_convert_to_rfc1123,
1107    (png_structp png_ptr,
1108    png_const_timep ptime));
1109#endif
1110
1111#ifdef PNG_CONVERT_tIME_SUPPORTED
1112/* Convert from a struct tm to png_time */
1113PNG_EXPORT(24, void, png_convert_from_struct_tm, (png_timep ptime,
1114    PNG_CONST struct tm FAR * ttime));
1115
1116/* Convert from time_t to png_time.  Uses gmtime() */
1117PNG_EXPORT(25, void, png_convert_from_time_t,
1118    (png_timep ptime, time_t ttime));
1119#endif /* PNG_CONVERT_tIME_SUPPORTED */
1120
1121#ifdef PNG_READ_EXPAND_SUPPORTED
1122/* Expand data to 24-bit RGB, or 8-bit grayscale, with alpha if available. */
1123PNG_EXPORT(26, void, png_set_expand, (png_structp png_ptr));
1124PNG_EXPORT(27, void, png_set_expand_gray_1_2_4_to_8, (png_structp png_ptr));
1125PNG_EXPORT(28, void, png_set_palette_to_rgb, (png_structp png_ptr));
1126PNG_EXPORT(29, void, png_set_tRNS_to_alpha, (png_structp png_ptr));
1127#endif
1128
1129#ifdef PNG_READ_EXPAND_16_SUPPORTED
1130/* Expand to 16-bit channels, forces conversion of palette to RGB and expansion
1131 * of a tRNS chunk if present.
1132 */
1133PNG_EXPORT(221, void, png_set_expand_16, (png_structp png_ptr));
1134#endif
1135
1136#if defined(PNG_READ_BGR_SUPPORTED) || defined(PNG_WRITE_BGR_SUPPORTED)
1137/* Use blue, green, red order for pixels. */
1138PNG_EXPORT(30, void, png_set_bgr, (png_structp png_ptr));
1139#endif
1140
1141#ifdef PNG_READ_GRAY_TO_RGB_SUPPORTED
1142/* Expand the grayscale to 24-bit RGB if necessary. */
1143PNG_EXPORT(31, void, png_set_gray_to_rgb, (png_structp png_ptr));
1144#endif
1145
1146#ifdef PNG_READ_RGB_TO_GRAY_SUPPORTED
1147/* Reduce RGB to grayscale. */
1148#define PNG_ERROR_ACTION_NONE  1
1149#define PNG_ERROR_ACTION_WARN  2
1150#define PNG_ERROR_ACTION_ERROR 3
1151#define PNG_RGB_TO_GRAY_DEFAULT (-1)/*for red/green coefficients*/
1152
1153PNG_FP_EXPORT(32, void, png_set_rgb_to_gray, (png_structp png_ptr,
1154    int error_action, double red, double green));
1155PNG_FIXED_EXPORT(33, void, png_set_rgb_to_gray_fixed, (png_structp png_ptr,
1156    int error_action, png_fixed_point red, png_fixed_point green));
1157
1158PNG_EXPORT(34, png_byte, png_get_rgb_to_gray_status, (png_const_structp
1159    png_ptr));
1160#endif
1161
1162#ifdef PNG_BUILD_GRAYSCALE_PALETTE_SUPPORTED
1163PNG_EXPORT(35, void, png_build_grayscale_palette, (int bit_depth,
1164    png_colorp palette));
1165#endif
1166
1167#ifdef PNG_READ_ALPHA_MODE_SUPPORTED
1168/* How the alpha channel is interpreted - this affects how the color channels of
1169 * a PNG file are returned when an alpha channel, or tRNS chunk in a palette
1170 * file, is present.
1171 *
1172 * This has no effect on the …

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