1 /* png.h - header file for PNG reference library 2 * 3 * libpng version 1.2.37 - June 4, 2009 4 * Copyright (c) 1998-2009 Glenn Randers-Pehrson 5 * (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger) 6 * (Version 0.88 Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.) 7 * 8 * Authors and maintainers: 9 * libpng versions 0.71, May 1995, through 0.88, January 1996: Guy Schalnat 10 * libpng versions 0.89c, June 1996, through 0.96, May 1997: Andreas Dilger 11 * libpng versions 0.97, January 1998, through 1.2.37 - June 4, 2009: Glenn 12 * See also "Contributing Authors", below. 13 * 14 * Note about libpng version numbers: 15 * 16 * Due to various miscommunications, unforeseen code incompatibilities 17 * and occasional factors outside the authors' control, version numbering 18 * on the library has not always been consistent and straightforward. 19 * The following table summarizes matters since version 0.89c, which was 20 * the first widely used release: 21 * 22 * source png.h png.h shared-lib 23 * version string int version 24 * ------- ------ ----- ---------- 25 * 0.89c "1.0 beta 3" 0.89 89 1.0.89 26 * 0.90 "1.0 beta 4" 0.90 90 0.90 [should have been 2.0.90] 27 * 0.95 "1.0 beta 5" 0.95 95 0.95 [should have been 2.0.95] 28 * 0.96 "1.0 beta 6" 0.96 96 0.96 [should have been 2.0.96] 29 * 0.97b "1.00.97 beta 7" 1.00.97 97 1.0.1 [should have been 2.0.97] 30 * 0.97c 0.97 97 2.0.97 31 * 0.98 0.98 98 2.0.98 32 * 0.99 0.99 98 2.0.99 33 * 0.99a-m 0.99 99 2.0.99 34 * 1.00 1.00 100 2.1.0 [100 should be 10000] 35 * 1.0.0 (from here on, the 100 2.1.0 [100 should be 10000] 36 * 1.0.1 png.h string is 10001 2.1.0 37 * 1.0.1a-e identical to the 10002 from here on, the shared library 38 * 1.0.2 source version) 10002 is 2.V where V is the source code 39 * 1.0.2a-b 10003 version, except as noted. 40 * 1.0.3 10003 41 * 1.0.3a-d 10004 42 * 1.0.4 10004 43 * 1.0.4a-f 10005 44 * 1.0.5 (+ 2 patches) 10005 45 * 1.0.5a-d 10006 46 * 1.0.5e-r 10100 (not source compatible) 47 * 1.0.5s-v 10006 (not binary compatible) 48 * 1.0.6 (+ 3 patches) 10006 (still binary incompatible) 49 * 1.0.6d-f 10007 (still binary incompatible) 50 * 1.0.6g 10007 51 * 1.0.6h 10007 10.6h (testing xy.z so-numbering) 52 * 1.0.6i 10007 10.6i 53 * 1.0.6j 10007 2.1.0.6j (incompatible with 1.0.0) 54 * 1.0.7beta11-14 DLLNUM 10007 2.1.0.7beta11-14 (binary compatible) 55 * 1.0.7beta15-18 1 10007 2.1.0.7beta15-18 (binary compatible) 56 * 1.0.7rc1-2 1 10007 2.1.0.7rc1-2 (binary compatible) 57 * 1.0.7 1 10007 (still compatible) 58 * 1.0.8beta1-4 1 10008 2.1.0.8beta1-4 59 * 1.0.8rc1 1 10008 2.1.0.8rc1 60 * 1.0.8 1 10008 2.1.0.8 61 * 1.0.9beta1-6 1 10009 2.1.0.9beta1-6 62 * 1.0.9rc1 1 10009 2.1.0.9rc1 63 * 1.0.9beta7-10 1 10009 2.1.0.9beta7-10 64 * 1.0.9rc2 1 10009 2.1.0.9rc2 65 * 1.0.9 1 10009 2.1.0.9 66 * 1.0.10beta1 1 10010 2.1.0.10beta1 67 * 1.0.10rc1 1 10010 2.1.0.10rc1 68 * 1.0.10 1 10010 2.1.0.10 69 * 1.0.11beta1-3 1 10011 2.1.0.11beta1-3 70 * 1.0.11rc1 1 10011 2.1.0.11rc1 71 * 1.0.11 1 10011 2.1.0.11 72 * 1.0.12beta1-2 2 10012 2.1.0.12beta1-2 73 * 1.0.12rc1 2 10012 2.1.0.12rc1 74 * 1.0.12 2 10012 2.1.0.12 75 * 1.1.0a-f - 10100 2.1.1.0a-f (branch abandoned) 76 * 1.2.0beta1-2 2 10200 2.1.2.0beta1-2 77 * 1.2.0beta3-5 3 10200 3.1.2.0beta3-5 78 * 1.2.0rc1 3 10200 3.1.2.0rc1 79 * 1.2.0 3 10200 3.1.2.0 80 * 1.2.1beta1-4 3 10201 3.1.2.1beta1-4 81 * 1.2.1rc1-2 3 10201 3.1.2.1rc1-2 82 * 1.2.1 3 10201 3.1.2.1 83 * 1.2.2beta1-6 12 10202 12.so.0.1.2.2beta1-6 84 * 1.0.13beta1 10 10013 10.so.0.1.0.13beta1 85 * 1.0.13rc1 10 10013 10.so.0.1.0.13rc1 86 * 1.2.2rc1 12 10202 12.so.0.1.2.2rc1 87 * 1.0.13 10 10013 10.so.0.1.0.13 88 * 1.2.2 12 10202 12.so.0.1.2.2 89 * 1.2.3rc1-6 12 10203 12.so.0.1.2.3rc1-6 90 * 1.2.3 12 10203 12.so.0.1.2.3 91 * 1.2.4beta1-3 13 10204 12.so.0.1.2.4beta1-3 92 * 1.0.14rc1 13 10014 10.so.0.1.0.14rc1 93 * 1.2.4rc1 13 10204 12.so.0.1.2.4rc1 94 * 1.0.14 10 10014 10.so.0.1.0.14 95 * 1.2.4 13 10204 12.so.0.1.2.4 96 * 1.2.5beta1-2 13 10205 12.so.0.1.2.5beta1-2 97 * 1.0.15rc1-3 10 10015 10.so.0.1.0.15rc1-3 98 * 1.2.5rc1-3 13 10205 12.so.0.1.2.5rc1-3 99 * 1.0.15 10 10015 10.so.0.1.0.15 100 * 1.2.5 13 10205 12.so.0.1.2.5 101 * 1.2.6beta1-4 13 10206 12.so.0.1.2.6beta1-4 102 * 1.0.16 10 10016 10.so.0.1.0.16 103 * 1.2.6 13 10206 12.so.0.1.2.6 104 * 1.2.7beta1-2 13 10207 12.so.0.1.2.7beta1-2 105 * 1.0.17rc1 10 10017 10.so.0.1.0.17rc1 106 * 1.2.7rc1 13 10207 12.so.0.1.2.7rc1 107 * 1.0.17 10 10017 10.so.0.1.0.17 108 * 1.2.7 13 10207 12.so.0.1.2.7 109 * 1.2.8beta1-5 13 10208 12.so.0.1.2.8beta1-5 110 * 1.0.18rc1-5 10 10018 10.so.0.1.0.18rc1-5 111 * 1.2.8rc1-5 13 10208 12.so.0.1.2.8rc1-5 112 * 1.0.18 10 10018 10.so.0.1.0.18 113 * 1.2.8 13 10208 12.so.0.1.2.8 114 * 1.2.9beta1-3 13 10209 12.so.0.1.2.9beta1-3 115 * 1.2.9beta4-11 13 10209 12.so.0.9[.0] 116 * 1.2.9rc1 13 10209 12.so.0.9[.0] 117 * 1.2.9 13 10209 12.so.0.9[.0] 118 * 1.2.10beta1-8 13 10210 12.so.0.10[.0] 119 * 1.2.10rc1-3 13 10210 12.so.0.10[.0] 120 * 1.2.10 13 10210 12.so.0.10[.0] 121 * 1.2.11beta1-4 13 10211 12.so.0.11[.0] 122 * 1.0.19rc1-5 10 10019 10.so.0.19[.0] 123 * 1.2.11rc1-5 13 10211 12.so.0.11[.0] 124 * 1.0.19 10 10019 10.so.0.19[.0] 125 * 1.2.11 13 10211 12.so.0.11[.0] 126 * 1.0.20 10 10020 10.so.0.20[.0] 127 * 1.2.12 13 10212 12.so.0.12[.0] 128 * 1.2.13beta1 13 10213 12.so.0.13[.0] 129 * 1.0.21 10 10021 10.so.0.21[.0] 130 * 1.2.13 13 10213 12.so.0.13[.0] 131 * 1.2.14beta1-2 13 10214 12.so.0.14[.0] 132 * 1.0.22rc1 10 10022 10.so.0.22[.0] 133 * 1.2.14rc1 13 10214 12.so.0.14[.0] 134 * 1.0.22 10 10022 10.so.0.22[.0] 135 * 1.2.14 13 10214 12.so.0.14[.0] 136 * 1.2.15beta1-6 13 10215 12.so.0.15[.0] 137 * 1.0.23rc1-5 10 10023 10.so.0.23[.0] 138 * 1.2.15rc1-5 13 10215 12.so.0.15[.0] 139 * 1.0.23 10 10023 10.so.0.23[.0] 140 * 1.2.15 13 10215 12.so.0.15[.0] 141 * 1.2.16beta1-2 13 10216 12.so.0.16[.0] 142 * 1.2.16rc1 13 10216 12.so.0.16[.0] 143 * 1.0.24 10 10024 10.so.0.24[.0] 144 * 1.2.16 13 10216 12.so.0.16[.0] 145 * 1.2.17beta1-2 13 10217 12.so.0.17[.0] 146 * 1.0.25rc1 10 10025 10.so.0.25[.0] 147 * 1.2.17rc1-3 13 10217 12.so.0.17[.0] 148 * 1.0.25 10 10025 10.so.0.25[.0] 149 * 1.2.17 13 10217 12.so.0.17[.0] 150 * 1.0.26 10 10026 10.so.0.26[.0] 151 * 1.2.18 13 10218 12.so.0.18[.0] 152 * 1.2.19beta1-31 13 10219 12.so.0.19[.0] 153 * 1.0.27rc1-6 10 10027 10.so.0.27[.0] 154 * 1.2.19rc1-6 13 10219 12.so.0.19[.0] 155 * 1.0.27 10 10027 10.so.0.27[.0] 156 * 1.2.19 13 10219 12.so.0.19[.0] 157 * 1.2.20beta01-04 13 10220 12.so.0.20[.0] 158 * 1.0.28rc1-6 10 10028 10.so.0.28[.0] 159 * 1.2.20rc1-6 13 10220 12.so.0.20[.0] 160 * 1.0.28 10 10028 10.so.0.28[.0] 161 * 1.2.20 13 10220 12.so.0.20[.0] 162 * 1.2.21beta1-2 13 10221 12.so.0.21[.0] 163 * 1.2.21rc1-3 13 10221 12.so.0.21[.0] 164 * 1.0.29 10 10029 10.so.0.29[.0] 165 * 1.2.21 13 10221 12.so.0.21[.0] 166 * 1.2.22beta1-4 13 10222 12.so.0.22[.0] 167 * 1.0.30rc1 10 10030 10.so.0.30[.0] 168 * 1.2.22rc1 13 10222 12.so.0.22[.0] 169 * 1.0.30 10 10030 10.so.0.30[.0] 170 * 1.2.22 13 10222 12.so.0.22[.0] 171 * 1.2.23beta01-05 13 10223 12.so.0.23[.0] 172 * 1.2.23rc01 13 10223 12.so.0.23[.0] 173 * 1.2.23 13 10223 12.so.0.23[.0] 174 * 1.2.24beta01-02 13 10224 12.so.0.24[.0] 175 * 1.2.24rc01 13 10224 12.so.0.24[.0] 176 * 1.2.24 13 10224 12.so.0.24[.0] 177 * 1.2.25beta01-06 13 10225 12.so.0.25[.0] 178 * 1.2.25rc01-02 13 10225 12.so.0.25[.0] 179 * 1.0.31 10 10031 10.so.0.31[.0] 180 * 1.2.25 13 10225 12.so.0.25[.0] 181 * 1.2.26beta01-06 13 10226 12.so.0.26[.0] 182 * 1.2.26rc01 13 10226 12.so.0.26[.0] 183 * 1.2.26 13 10226 12.so.0.26[.0] 184 * 1.0.32 10 10032 10.so.0.32[.0] 185 * 1.2.27beta01-06 13 10227 12.so.0.27[.0] 186 * 1.2.27rc01 13 10227 12.so.0.27[.0] 187 * 1.0.33 10 10033 10.so.0.33[.0] 188 * 1.2.27 13 10227 12.so.0.27[.0] 189 * 1.0.34 10 10034 10.so.0.34[.0] 190 * 1.2.28 13 10228 12.so.0.28[.0] 191 * 1.2.29beta01-03 13 10229 12.so.0.29[.0] 192 * 1.2.29rc01 13 10229 12.so.0.29[.0] 193 * 1.0.35 10 10035 10.so.0.35[.0] 194 * 1.2.29 13 10229 12.so.0.29[.0] 195 * 1.0.37 10 10037 10.so.0.37[.0] 196 * 1.2.30beta01-04 13 10230 12.so.0.30[.0] 197 * 1.0.38rc01-08 10 10038 10.so.0.38[.0] 198 * 1.2.30rc01-08 13 10230 12.so.0.30[.0] 199 * 1.0.38 10 10038 10.so.0.38[.0] 200 * 1.2.30 13 10230 12.so.0.30[.0] 201 * 1.0.39rc01-03 10 10039 10.so.0.39[.0] 202 * 1.2.31rc01-03 13 10231 12.so.0.31[.0] 203 * 1.0.39 10 10039 10.so.0.39[.0] 204 * 1.2.31 13 10231 12.so.0.31[.0] 205 * 1.2.32beta01-02 13 10232 12.so.0.32[.0] 206 * 1.0.40rc01 10 10040 10.so.0.40[.0] 207 * 1.2.32rc01 13 10232 12.so.0.32[.0] 208 * 1.0.40 10 10040 10.so.0.40[.0] 209 * 1.2.32 13 10232 12.so.0.32[.0] 210 * 1.2.33beta01-02 13 10233 12.so.0.33[.0] 211 * 1.2.33rc01-02 13 10233 12.so.0.33[.0] 212 * 1.0.41rc01 10 10041 10.so.0.41[.0] 213 * 1.2.33 13 10233 12.so.0.33[.0] 214 * 1.0.41 10 10041 10.so.0.41[.0] 215 * 1.2.34beta01-07 13 10234 12.so.0.34[.0] 216 * 1.0.42rc01 10 10042 10.so.0.42[.0] 217 * 1.2.34rc01 13 10234 12.so.0.34[.0] 218 * 1.0.42 10 10042 10.so.0.42[.0] 219 * 1.2.34 13 10234 12.so.0.34[.0] 220 * 1.2.35beta01-03 13 10235 12.so.0.35[.0] 221 * 1.0.43rc01-02 10 10043 10.so.0.43[.0] 222 * 1.2.35rc01-02 13 10235 12.so.0.35[.0] 223 * 1.0.43 10 10043 10.so.0.43[.0] 224 * 1.2.35 13 10235 12.so.0.35[.0] 225 * 1.2.36beta01-05 13 10236 12.so.0.36[.0] 226 * 1.2.36rc01 13 10236 12.so.0.36[.0] 227 * 1.0.44 10 10044 10.so.0.44[.0] 228 * 1.2.36 13 10236 12.so.0.36[.0] 229 * 1.2.37beta01-03 13 10237 12.so.0.37[.0] 230 * 1.2.37rc01 13 10237 12.so.0.37[.0] 231 * 1.2.37 13 10237 12.so.0.37[.0] 232 * 233 * Henceforth the source version will match the shared-library major 234 * and minor numbers; the shared-library major version number will be 235 * used for changes in backward compatibility, as it is intended. The 236 * PNG_LIBPNG_VER macro, which is not used within libpng but is available 237 * for applications, is an unsigned integer of the form xyyzz corresponding 238 * to the source version x.y.z (leading zeros in y and z). Beta versions 239 * were given the previous public release number plus a letter, until 240 * version 1.0.6j; from then on they were given the upcoming public 241 * release number plus "betaNN" or "rcNN". 242 * 243 * Binary incompatibility exists only when applications make direct access 244 * to the info_ptr or png_ptr members through png.h, and the compiled 245 * application is loaded with a different version of the library. 246 * 247 * DLLNUM will change each time there are forward or backward changes 248 * in binary compatibility (e.g., when a new feature is added). 249 * 250 * See libpng.txt or libpng.3 for more information. The PNG specification 251 * is available as a W3C Recommendation and as an ISO Specification, 252 * <http://www.w3.org/TR/2003/REC-PNG-20031110/ 253 */ 254 255 /* 256 * COPYRIGHT NOTICE, DISCLAIMER, and LICENSE: 257 * 258 * If you modify libpng you may insert additional notices immediately following 259 * this sentence. 260 * 261 * libpng versions 1.2.6, August 15, 2004, through 1.2.37, June 4, 2009, are 262 * Copyright (c) 2004, 2006-2009 Glenn Randers-Pehrson, and are 263 * distributed according to the same disclaimer and license as libpng-1.2.5 264 * with the following individual added to the list of Contributing Authors: 265 * 266 * Cosmin Truta 267 * 268 * libpng versions 1.0.7, July 1, 2000, through 1.2.5, October 3, 2002, are 269 * Copyright (c) 2000-2002 Glenn Randers-Pehrson, and are 270 * distributed according to the same disclaimer and license as libpng-1.0.6 271 * with the following individuals added to the list of Contributing Authors: 272 * 273 * Simon-Pierre Cadieux 274 * Eric S. Raymond 275 * Gilles Vollant 276 * 277 * and with the following additions to the disclaimer: 278 * 279 * There is no warranty against interference with your enjoyment of the 280 * library or against infringement. There is no warranty that our 281 * efforts or the library will fulfill any of your particular purposes 282 * or needs. This library is provided with all faults, and the entire 283 * risk of satisfactory quality, performance, accuracy, and effort is with 284 * the user. 285 * 286 * libpng versions 0.97, January 1998, through 1.0.6, March 20, 2000, are 287 * Copyright (c) 1998, 1999, 2000 Glenn Randers-Pehrson, and are 288 * distributed according to the same disclaimer and license as libpng-0.96, 289 * with the following individuals added to the list of Contributing Authors: 290 * 291 * Tom Lane 292 * Glenn Randers-Pehrson 293 * Willem van Schaik 294 * 295 * libpng versions 0.89, June 1996, through 0.96, May 1997, are 296 * Copyright (c) 1996, 1997 Andreas Dilger 297 * Distributed according to the same disclaimer and license as libpng-0.88, 298 * with the following individuals added to the list of Contributing Authors: 299 * 300 * John Bowler 301 * Kevin Bracey 302 * Sam Bushell 303 * Magnus Holmgren 304 * Greg Roelofs 305 * Tom Tanner 306 * 307 * libpng versions 0.5, May 1995, through 0.88, January 1996, are 308 * Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc. 309 * 310 * For the purposes of this copyright and license, "Contributing Authors" 311 * is defined as the following set of individuals: 312 * 313 * Andreas Dilger 314 * Dave Martindale 315 * Guy Eric Schalnat 316 * Paul Schmidt 317 * Tim Wegner 318 * 319 * The PNG Reference Library is supplied "AS IS". The Contributing Authors 320 * and Group 42, Inc. disclaim all warranties, expressed or implied, 321 * including, without limitation, the warranties of merchantability and of 322 * fitness for any purpose. The Contributing Authors and Group 42, Inc. 323 * assume no liability for direct, indirect, incidental, special, exemplary, 324 * or consequential damages, which may result from the use of the PNG 325 * Reference Library, even if advised of the possibility of such damage. 326 * 327 * Permission is hereby granted to use, copy, modify, and distribute this 328 * source code, or portions hereof, for any purpose, without fee, subject 329 * to the following restrictions: 330 * 331 * 1. The origin of this source code must not be misrepresented. 332 * 333 * 2. Altered versions must be plainly marked as such and 334 * must not be misrepresented as being the original source. 335 * 336 * 3. This Copyright notice may not be removed or altered from 337 * any source or altered source distribution. 338 * 339 * The Contributing Authors and Group 42, Inc. specifically permit, without 340 * fee, and encourage the use of this source code as a component to 341 * supporting the PNG file format in commercial products. If you use this 342 * source code in a product, acknowledgment is not required but would be 343 * appreciated. 344 */ 345 346 /* 347 * A "png_get_copyright" function is available, for convenient use in "about" 348 * boxes and the like: 349 * 350 * printf("%s",png_get_copyright(NULL)); 351 * 352 * Also, the PNG logo (in PNG format, of course) is supplied in the 353 * files "pngbar.png" and "pngbar.jpg (88x31) and "pngnow.png" (98x31). 354 */ 355 356 /* 357 * Libpng is OSI Certified Open Source Software. OSI Certified is a 358 * certification mark of the Open Source Initiative. 359 */ 360 361 /* 362 * The contributing authors would like to thank all those who helped 363 * with testing, bug fixes, and patience. This wouldn't have been 364 * possible without all of you. 365 * 366 * Thanks to Frank J. T. Wojcik for helping with the documentation. 367 */ 368 369 /* 370 * Y2K compliance in libpng: 371 * ========================= 372 * 373 * June 4, 2009 374 * 375 * Since the PNG Development group is an ad-hoc body, we can't make 376 * an official declaration. 377 * 378 * This is your unofficial assurance that libpng from version 0.71 and 379 * upward through 1.2.37 are Y2K compliant. It is my belief that earlier 380 * versions were also Y2K compliant. 381 * 382 * Libpng only has three year fields. One is a 2-byte unsigned integer 383 * that will hold years up to 65535. The other two hold the date in text 384 * format, and will hold years up to 9999. 385 * 386 * The integer is 387 * "png_uint_16 year" in png_time_struct. 388 * 389 * The strings are 390 * "png_charp time_buffer" in png_struct and 391 * "near_time_buffer", which is a local character string in png.c. 392 * 393 * There are seven time-related functions: 394 * png.c: png_convert_to_rfc_1123() in png.c 395 * (formerly png_convert_to_rfc_1152() in error) 396 * png_convert_from_struct_tm() in pngwrite.c, called in pngwrite.c 397 * png_convert_from_time_t() in pngwrite.c 398 * png_get_tIME() in pngget.c 399 * png_handle_tIME() in pngrutil.c, called in pngread.c 400 * png_set_tIME() in pngset.c 401 * png_write_tIME() in pngwutil.c, called in pngwrite.c 402 * 403 * All handle dates properly in a Y2K environment. The 404 * png_convert_from_time_t() function calls gmtime() to convert from system 405 * clock time, which returns (year - 1900), which we properly convert to 406 * the full 4-digit year. There is a possibility that applications using 407 * libpng are not passing 4-digit years into the png_convert_to_rfc_1123() 408 * function, or that they are incorrectly passing only a 2-digit year 409 * instead of "year - 1900" into the png_convert_from_struct_tm() function, 410 * but this is not under our control. The libpng documentation has always 411 * stated that it works with 4-digit years, and the APIs have been 412 * documented as such. 413 * 414 * The tIME chunk itself is also Y2K compliant. It uses a 2-byte unsigned 415 * integer to hold the year, and can hold years as large as 65535. 416 * 417 * zlib, upon which libpng depends, is also Y2K compliant. It contains 418 * no date-related code. 419 * 420 * Glenn Randers-Pehrson 421 * libpng maintainer 422 * PNG Development Group 423 */ 424 425 #ifndef PNG_H 426 #define PNG_H 427 428 /* This is not the place to learn how to use libpng. The file libpng.txt 429 * describes how to use libpng, and the file example.c summarizes it 430 * with some code on which to build. This file is useful for looking 431 * at the actual function definitions and structure components. 432 */ 433 434 /* Version information for png.h - this should match the version in png.c */ 435 #define PNG_LIBPNG_VER_STRING "1.2.37" 436 #define PNG_HEADER_VERSION_STRING \ 437 " libpng version 1.2.37 - June 4, 2009\n" 438 439 #define PNG_LIBPNG_VER_SONUM 0 440 #define PNG_LIBPNG_VER_DLLNUM 13 441 442 /* These should match the first 3 components of PNG_LIBPNG_VER_STRING: */ 443 #define PNG_LIBPNG_VER_MAJOR 1 444 #define PNG_LIBPNG_VER_MINOR 2 445 #define PNG_LIBPNG_VER_RELEASE 37 446 /* This should match the numeric part of the final component of 447 * PNG_LIBPNG_VER_STRING, omitting any leading zero: */ 448 449 #define PNG_LIBPNG_VER_BUILD 0 450 451 /* Release Status */ 452 #define PNG_LIBPNG_BUILD_ALPHA 1 453 #define PNG_LIBPNG_BUILD_BETA 2 454 #define PNG_LIBPNG_BUILD_RC 3 455 #define PNG_LIBPNG_BUILD_STABLE 4 456 #define PNG_LIBPNG_BUILD_RELEASE_STATUS_MASK 7 457 458 /* Release-Specific Flags */ 459 #define PNG_LIBPNG_BUILD_PATCH 8 /* Can be OR'ed with 460 PNG_LIBPNG_BUILD_STABLE only */ 461 #define PNG_LIBPNG_BUILD_PRIVATE 16 /* Cannot be OR'ed with 462 PNG_LIBPNG_BUILD_SPECIAL */ 463 #define PNG_LIBPNG_BUILD_SPECIAL 32 /* Cannot be OR'ed with 464 PNG_LIBPNG_BUILD_PRIVATE */ 465 466 #define PNG_LIBPNG_BUILD_BASE_TYPE PNG_LIBPNG_BUILD_STABLE 467 468 /* Careful here. At one time, Guy wanted to use 082, but that would be octal. 469 * We must not include leading zeros. 470 * Versions 0.7 through 1.0.0 were in the range 0 to 100 here (only 471 * version 1.0.0 was mis-numbered 100 instead of 10000). From 472 * version 1.0.1 it's xxyyzz, where x=major, y=minor, z=release */ 473 #define PNG_LIBPNG_VER 10237 /* 1.2.37 */ 474 475 #ifndef PNG_VERSION_INFO_ONLY 476 /* include the compression library's header */ 477 #include "zlib.h" 478 #endif 479 480 /* include all user configurable info, including optional assembler routines */ 481 #include "pngconf.h" 482 483 /* 484 * Added at libpng-1.2.8 */ 485 /* Ref MSDN: Private as priority over Special 486 * VS_FF_PRIVATEBUILD File *was not* built using standard release 487 * procedures. If this value is given, the StringFileInfo block must 488 * contain a PrivateBuild string. 489 * 490 * VS_FF_SPECIALBUILD File *was* built by the original company using 491 * standard release procedures but is a variation of the standard 492 * file of the same version number. If this value is given, the 493 * StringFileInfo block must contain a SpecialBuild string. 494 */ 495 496 #if defined(PNG_USER_PRIVATEBUILD) 497 # define PNG_LIBPNG_BUILD_TYPE \ 498 (PNG_LIBPNG_BUILD_BASE_TYPE | PNG_LIBPNG_BUILD_PRIVATE) 499 #else 500 # if defined(PNG_LIBPNG_SPECIALBUILD) 501 # define PNG_LIBPNG_BUILD_TYPE \ 502 (PNG_LIBPNG_BUILD_BASE_TYPE | PNG_LIBPNG_BUILD_SPECIAL) 503 # else 504 # define PNG_LIBPNG_BUILD_TYPE (PNG_LIBPNG_BUILD_BASE_TYPE) 505 # endif 506 #endif 507 508 #ifndef PNG_VERSION_INFO_ONLY 509 510 /* Inhibit C++ name-mangling for libpng functions but not for system calls. */ 511 #ifdef __cplusplus 512 extern "C" { 513 #endif /* __cplusplus */ 514 515 /* This file is arranged in several sections. The first section contains 516 * structure and type definitions. The second section contains the external 517 * library functions, while the third has the internal library functions, 518 * which applications aren't expected to use directly. 519 */ 520 521 #ifndef PNG_NO_TYPECAST_NULL 522 #define int_p_NULL (int *)NULL 523 #define png_bytep_NULL (png_bytep)NULL 524 #define png_bytepp_NULL (png_bytepp)NULL 525 #define png_doublep_NULL (png_doublep)NULL 526 #define png_error_ptr_NULL (png_error_ptr)NULL 527 #define png_flush_ptr_NULL (png_flush_ptr)NULL 528 #define png_free_ptr_NULL (png_free_ptr)NULL 529 #define png_infopp_NULL (png_infopp)NULL 530 #define png_malloc_ptr_NULL (png_malloc_ptr)NULL 531 #define png_read_status_ptr_NULL (png_read_status_ptr)NULL 532 #define png_rw_ptr_NULL (png_rw_ptr)NULL 533 #define png_structp_NULL (png_structp)NULL 534 #define png_uint_16p_NULL (png_uint_16p)NULL 535 #define png_voidp_NULL (png_voidp)NULL 536 #define png_write_status_ptr_NULL (png_write_status_ptr)NULL 537 #else 538 #define int_p_NULL NULL 539 #define png_bytep_NULL NULL 540 #define png_bytepp_NULL NULL 541 #define png_doublep_NULL NULL 542 #define png_error_ptr_NULL NULL 543 #define png_flush_ptr_NULL NULL 544 #define png_free_ptr_NULL NULL 545 #define png_infopp_NULL NULL 546 #define png_malloc_ptr_NULL NULL 547 #define png_read_status_ptr_NULL NULL 548 #define png_rw_ptr_NULL NULL 549 #define png_structp_NULL NULL 550 #define png_uint_16p_NULL NULL 551 #define png_voidp_NULL NULL 552 #define png_write_status_ptr_NULL NULL 553 #endif 554 555 /* variables declared in png.c - only it needs to define PNG_NO_EXTERN */ 556 #if !defined(PNG_NO_EXTERN) || defined(PNG_ALWAYS_EXTERN) 557 /* Version information for C files, stored in png.c. This had better match 558 * the version above. 559 */ 560 #ifdef PNG_USE_GLOBAL_ARRAYS 561 PNG_EXPORT_VAR (PNG_CONST char) png_libpng_ver[18]; 562 /* need room for 99.99.99beta99z */ 563 #else 564 #define png_libpng_ver png_get_header_ver(NULL) 565 #endif 566 567 #ifdef PNG_USE_GLOBAL_ARRAYS 568 /* This was removed in version 1.0.5c */ 569 /* Structures to facilitate easy interlacing. See png.c for more details */ 570 PNG_EXPORT_VAR (PNG_CONST int FARDATA) png_pass_start[7]; 571 PNG_EXPORT_VAR (PNG_CONST int FARDATA) png_pass_inc[7]; 572 PNG_EXPORT_VAR (PNG_CONST int FARDATA) png_pass_ystart[7]; 573 PNG_EXPORT_VAR (PNG_CONST int FARDATA) png_pass_yinc[7]; 574 PNG_EXPORT_VAR (PNG_CONST int FARDATA) png_pass_mask[7]; 575 PNG_EXPORT_VAR (PNG_CONST int FARDATA) png_pass_dsp_mask[7]; 576 /* This isn't currently used. If you need it, see png.c for more details. 577 PNG_EXPORT_VAR (PNG_CONST int FARDATA) png_pass_height[7]; 578 */ 579 #endif 580 581 #endif /* PNG_NO_EXTERN */ 582 583 /* Three color definitions. The order of the red, green, and blue, (and the 584 * exact size) is not important, although the size of the fields need to 585 * be png_byte or png_uint_16 (as defined below). 586 */ 587 typedef struct png_color_struct 588 { 589 png_byte red; 590 png_byte green; 591 png_byte blue; 592 } png_color; 593 typedef png_color FAR * png_colorp; 594 typedef png_color FAR * FAR * png_colorpp; 595 596 typedef struct png_color_16_struct 597 { 598 png_byte index; /* used for palette files */ 599 png_uint_16 red; /* for use in red green blue files */ 600 png_uint_16 green; 601 png_uint_16 blue; 602 png_uint_16 gray; /* for use in grayscale files */ 603 } png_color_16; 604 typedef png_color_16 FAR * png_color_16p; 605 typedef png_color_16 FAR * FAR * png_color_16pp; 606 607 typedef struct png_color_8_struct 608 { 609 png_byte red; /* for use in red green blue files */ 610 png_byte green; 611 png_byte blue; 612 png_byte gray; /* for use in grayscale files */ 613 png_byte alpha; /* for alpha channel files */ 614 } png_color_8; 615 typedef png_color_8 FAR * png_color_8p; 616 typedef png_color_8 FAR * FAR * png_color_8pp; 617 618 /* 619 * The following two structures are used for the in-core representation 620 * of sPLT chunks. 621 */ 622 typedef struct png_sPLT_entry_struct 623 { 624 png_uint_16 red; 625 png_uint_16 green; 626 png_uint_16 blue; 627 png_uint_16 alpha; 628 png_uint_16 frequency; 629 } png_sPLT_entry; 630 typedef png_sPLT_entry FAR * png_sPLT_entryp; 631 typedef png_sPLT_entry FAR * FAR * png_sPLT_entrypp; 632 633 /* When the depth of the sPLT palette is 8 bits, the color and alpha samples 634 * occupy the LSB of their respective members, and the MSB of each member 635 * is zero-filled. The frequency member always occupies the full 16 bits. 636 */ 637 638 typedef struct png_sPLT_struct 639 { 640 png_charp name; /* palette name */ 641 png_byte depth; /* depth of palette samples */ 642 png_sPLT_entryp entries; /* palette entries */ 643 png_int_32 nentries; /* number of palette entries */ 644 } png_sPLT_t; 645 typedef png_sPLT_t FAR * png_sPLT_tp; 646 typedef png_sPLT_t FAR * FAR * png_sPLT_tpp; 647 648 #ifdef PNG_TEXT_SUPPORTED 649 /* png_text holds the contents of a text/ztxt/itxt chunk in a PNG file, 650 * and whether that contents is compressed or not. The "key" field 651 * points to a regular zero-terminated C string. The "text", "lang", and 652 * "lang_key" fields can be regular C strings, empty strings, or NULL pointers. 653 * However, the * structure returned by png_get_text() will always contain 654 * regular zero-terminated C strings (possibly empty), never NULL pointers, 655 * so they can be safely used in printf() and other string-handling functions. 656 */ 657 typedef struct png_text_struct 658 { 659 int compression; /* compression value: 660 -1: tEXt, none 661 0: zTXt, deflate 662 1: iTXt, none 663 2: iTXt, deflate */ 664 png_charp key; /* keyword, 1-79 character description of "text" */ 665 png_charp text; /* comment, may be an empty string (ie "") 666 or a NULL pointer */ 667 png_size_t text_length; /* length of the text string */ 668 #ifdef PNG_iTXt_SUPPORTED 669 png_size_t itxt_length; /* length of the itxt string */ 670 png_charp lang; /* language code, 0-79 characters 671 or a NULL pointer */ 672 png_charp lang_key; /* keyword translated UTF-8 string, 0 or more 673 chars or a NULL pointer */ 674 #endif 675 } png_text; 676 typedef png_text FAR * png_textp; 677 typedef png_text FAR * FAR * png_textpp; 678 #endif 679 680 /* Supported compression types for text in PNG files (tEXt, and zTXt). 681 * The values of the PNG_TEXT_COMPRESSION_ defines should NOT be changed. */ 682 #define PNG_TEXT_COMPRESSION_NONE_WR -3 683 #define PNG_TEXT_COMPRESSION_zTXt_WR -2 684 #define PNG_TEXT_COMPRESSION_NONE -1 685 #define PNG_TEXT_COMPRESSION_zTXt 0 686 #define PNG_ITXT_COMPRESSION_NONE 1 687 #define PNG_ITXT_COMPRESSION_zTXt 2 688 #define PNG_TEXT_COMPRESSION_LAST 3 /* Not a valid value */ 689 690 /* png_time is a way to hold the time in an machine independent way. 691 * Two conversions are provided, both from time_t and struct tm. There 692 * is no portable way to convert to either of these structures, as far 693 * as I know. If you know of a portable way, send it to me. As a side 694 * note - PNG has always been Year 2000 compliant! 695 */ 696 typedef struct png_time_struct 697 { 698 png_uint_16 year; /* full year, as in, 1995 */ 699 png_byte month; /* month of year, 1 - 12 */ 700 png_byte day; /* day of month, 1 - 31 */ 701 png_byte hour; /* hour of day, 0 - 23 */ 702 png_byte minute; /* minute of hour, 0 - 59 */ 703 png_byte second; /* second of minute, 0 - 60 (for leap seconds) */ 704 } png_time; 705 typedef png_time FAR * png_timep; 706 typedef png_time FAR * FAR * png_timepp; 707 708 #if defined(PNG_UNKNOWN_CHUNKS_SUPPORTED) 709 /* png_unknown_chunk is a structure to hold queued chunks for which there is 710 * no specific support. The idea is that we can use this to queue 711 * up private chunks for output even though the library doesn't actually 712 * know about their semantics. 713 */ 714 #define PNG_CHUNK_NAME_LENGTH 5 715 typedef struct png_unknown_chunk_t 716 { 717 png_byte name[PNG_CHUNK_NAME_LENGTH]; 718 png_byte *data; 719 png_size_t size; 720 721 /* libpng-using applications should NOT directly modify this byte. */ 722 png_byte location; /* mode of operation at read time */ 723 } 724 png_unknown_chunk; 725 typedef png_unknown_chunk FAR * png_unknown_chunkp; 726 typedef png_unknown_chunk FAR * FAR * png_unknown_chunkpp; 727 #endif 728 729 /* png_info is a structure that holds the information in a PNG file so 730 * that the application can find out the characteristics of the image. 731 * If you are reading the file, this structure will tell you what is 732 * in the PNG file. If you are writing the file, fill in the information 733 * you want to put into the PNG file, then call png_write_info(). 734 * The names chosen should be very close to the PNG specification, so 735 * consult that document for information about the meaning of each field. 736 * 737 * With libpng < 0.95, it was only possible to directly set and read the 738 * the values in the png_info_struct, which meant that the contents and 739 * order of the values had to remain fixed. With libpng 0.95 and later, 740 * however, there are now functions that abstract the contents of 741 * png_info_struct from the application, so this makes it easier to use 742 * libpng with dynamic libraries, and even makes it possible to use 743 * libraries that don't have all of the libpng ancillary chunk-handing 744 * functionality. 745 * 746 * In any case, the order of the parameters in png_info_struct should NOT 747 * be changed for as long as possible to keep compatibility with applications 748 * that use the old direct-access method with png_info_struct. 749 * 750 * The following members may have allocated storage attached that should be 751 * cleaned up before the structure is discarded: palette, trans, text, 752 * pcal_purpose, pcal_units, pcal_params, hist, iccp_name, iccp_profile, 753 * splt_palettes, scal_unit, row_pointers, and unknowns. By default, these 754 * are automatically freed when the info structure is deallocated, if they were 755 * allocated internally by libpng. This behavior can be changed by means 756 * of the png_data_freer() function. 757 * 758 * More allocation details: all the chunk-reading functions that 759 * change these members go through the corresponding png_set_* 760 * functions. A function to clear these members is available: see 761 * png_free_data(). The png_set_* functions do not depend on being 762 * able to point info structure members to any of the storage they are 763 * passed (they make their own copies), EXCEPT that the png_set_text 764 * functions use the same storage passed to them in the text_ptr or 765 * itxt_ptr structure argument, and the png_set_rows and png_set_unknowns 766 * functions do not make their own copies. 767 */ 768 typedef struct png_info_struct 769 { 770 /* the following are necessary for every PNG file */ 771 png_uint_32 width; /* width of image in pixels (from IHDR) */ 772 png_uint_32 height; /* height of image in pixels (from IHDR) */ 773 png_uint_32 valid; /* valid chunk data (see PNG_INFO_ below) */ 774 png_uint_32 rowbytes; /* bytes needed to hold an untransformed row */ 775 png_colorp palette; /* array of color values (valid & PNG_INFO_PLTE) */ 776 png_uint_16 num_palette; /* number of color entries in "palette" (PLTE) */ 777 png_uint_16 num_trans; /* number of transparent palette color (tRNS) */ 778 png_byte bit_depth; /* 1, 2, 4, 8, or 16 bits/channel (from IHDR) */ 779 png_byte color_type; /* see PNG_COLOR_TYPE_ below (from IHDR) */ 780 /* The following three should have been named *_method not *_type */ 781 png_byte compression_type; /* must be PNG_COMPRESSION_TYPE_BASE (IHDR) */ 782 png_byte filter_type; /* must be PNG_FILTER_TYPE_BASE (from IHDR) */ 783 png_byte interlace_type; /* One of PNG_INTERLACE_NONE, PNG_INTERLACE_ADAM7 */ 784 785 /* The following is informational only on read, and not used on writes. */ 786 png_byte channels; /* number of data channels per pixel (1, 2, 3, 4) */ 787 png_byte pixel_depth; /* number of bits per pixel */ 788 png_byte spare_byte; /* to align the data, and for future use */ 789 png_byte signature[8]; /* magic bytes read by libpng from start of file */ 790 791 /* The rest of the data is optional. If you are reading, check the 792 * valid field to see if the information in these are valid. If you 793 * are writing, set the valid field to those chunks you want written, 794 * and initialize the appropriate fields below. 795 */ 796 797 #if defined(PNG_gAMA_SUPPORTED) && defined(PNG_FLOATING_POINT_SUPPORTED) 798 /* The gAMA chunk describes the gamma characteristics of the system 799 * on which the image was created, normally in the range [1.0, 2.5]. 800 * Data is valid if (valid & PNG_INFO_gAMA) is non-zero. 801 */ 802 float gamma; /* gamma value of image, if (valid & PNG_INFO_gAMA) */ 803 #endif 804 805 #if defined(PNG_sRGB_SUPPORTED) 806 /* GR-P, 0.96a */ 807 /* Data valid if (valid & PNG_INFO_sRGB) non-zero. */ 808 png_byte srgb_intent; /* sRGB rendering intent [0, 1, 2, or 3] */ 809 #endif 810 811 #if defined(PNG_TEXT_SUPPORTED) 812 /* The tEXt, and zTXt chunks contain human-readable textual data in 813 * uncompressed, compressed, and optionally compressed forms, respectively. 814 * The data in "text" is an array of pointers to uncompressed, 815 * null-terminated C strings. Each chunk has a keyword that describes the 816 * textual data contained in that chunk. Keywords are not required to be 817 * unique, and the text string may be empty. Any number of text chunks may 818 * be in an image. 819 */ 820 int num_text; /* number of comments read/to write */ 821 int max_text; /* current size of text array */ 822 png_textp text; /* array of comments read/to write */ 823 #endif /* PNG_TEXT_SUPPORTED */ 824 825 #if defined(PNG_tIME_SUPPORTED) 826 /* The tIME chunk holds the last time the displayed image data was 827 * modified. See the png_time struct for the contents of this struct. 828 */ 829 png_time mod_time; 830 #endif 831 832 #if defined(PNG_sBIT_SUPPORTED) 833 /* The sBIT chunk specifies the number of significant high-order bits 834 * in the pixel data. Values are in the range [1, bit_depth], and are 835 * only specified for the channels in the pixel data. The contents of 836 * the low-order bits is not specified. Data is valid if 837 * (valid & PNG_INFO_sBIT) is non-zero. 838 */ 839 png_color_8 sig_bit; /* significant bits in color channels */ 840 #endif 841 842 #if defined(PNG_tRNS_SUPPORTED) || defined(PNG_READ_EXPAND_SUPPORTED) || \ 843 defined(PNG_READ_BACKGROUND_SUPPORTED) 844 /* The tRNS chunk supplies transparency data for paletted images and 845 * other image types that don't need a full alpha channel. There are 846 * "num_trans" transparency values for a paletted image, stored in the 847 * same order as the palette colors, starting from index 0. Values 848 * for the data are in the range [0, 255], ranging from fully transparent 849 * to fully opaque, respectively. For non-paletted images, there is a 850 * single color specified that should be treated as fully transparent. 851 * Data is valid if (valid & PNG_INFO_tRNS) is non-zero. 852 */ 853 png_bytep trans; /* transparent values for paletted image */ 854 png_color_16 trans_values; /* transparent color for non-palette image */ 855 #endif 856 857 #if defined(PNG_bKGD_SUPPORTED) || defined(PNG_READ_BACKGROUND_SUPPORTED) 858 /* The bKGD chunk gives the suggested image background color if the 859 * display program does not have its own background color and the image 860 * is needs to composited onto a background before display. The colors 861 * in "background" are normally in the same color space/depth as the 862 * pixel data. Data is valid if (valid & PNG_INFO_bKGD) is non-zero. 863 */ 864 png_color_16 background; 865 #endif 866 867 #if defined(PNG_oFFs_SUPPORTED) 868 /* The oFFs chunk gives the offset in "offset_unit_type" units rightwards 869 * and downwards from the top-left corner of the display, page, or other 870 * application-specific co-ordinate space. See the PNG_OFFSET_ defines 871 * below for the unit types. Valid if (valid & PNG_INFO_oFFs) non-zero. 872 */ 873 png_int_32 x_offset; /* x offset on page */ 874 png_int_32 y_offset; /* y offset on page */ 875 png_byte offset_unit_type; /* offset units type */ 876 #endif 877 878 #if defined(PNG_pHYs_SUPPORTED) 879 /* The pHYs chunk gives the physical pixel density of the image for 880 * display or printing in "phys_unit_type" units (see PNG_RESOLUTION_ 881 * defines below). Data is valid if (valid & PNG_INFO_pHYs) is non-zero. 882 */ 883 png_uint_32 x_pixels_per_unit; /* horizontal pixel density */ 884 png_uint_32 y_pixels_per_unit; /* vertical pixel density */ 885 png_byte phys_unit_type; /* resolution type (see PNG_RESOLUTION_ below) */ 886 #endif 887 888 #if defined(PNG_hIST_SUPPORTED) 889 /* The hIST chunk contains the relative frequency or importance of the 890 * various palette entries, so that a viewer can intelligently select a 891 * reduced-color palette, if required. Data is an array of "num_palette" 892 * values in the range [0,65535]. Data valid if (valid & PNG_INFO_hIST) 893 * is non-zero. 894 */ 895 png_uint_16p hist; 896 #endif 897 898 #ifdef PNG_cHRM_SUPPORTED 899 /* The cHRM chunk describes the CIE color characteristics of the monitor 900 * on which the PNG was created. This data allows the viewer to do gamut 901 * mapping of the input image to ensure that the viewer sees the same 902 * colors in the image as the creator. Values are in the range 903 * [0.0, 0.8]. Data valid if (valid & PNG_INFO_cHRM) non-zero. 904 */ 905 #ifdef PNG_FLOATING_POINT_SUPPORTED 906 float x_white; 907 float y_white; 908 float x_red; 909 float y_red; 910 float x_green; 911 float y_green; 912 float x_blue; 913 float y_blue; 914 #endif 915 #endif 916 917 #if defined(PNG_pCAL_SUPPORTED) 918 /* The pCAL chunk describes a transformation between the stored pixel 919 * values and original physical data values used to create the image. 920 * The integer range [0, 2^bit_depth - 1] maps to the floating-point 921 * range given by [pcal_X0, pcal_X1], and are further transformed by a 922 * (possibly non-linear) transformation function given by "pcal_type" 923 * and "pcal_params" into "pcal_units". Please see the PNG_EQUATION_ 924 * defines below, and the PNG-Group's PNG extensions document for a 925 * complete description of the transformations and how they should be 926 * implemented, and for a description of the ASCII parameter strings. 927 * Data values are valid if (valid & PNG_INFO_pCAL) non-zero. 928 */ 929 png_charp pcal_purpose; /* pCAL chunk description string */ 930 png_int_32 pcal_X0; /* minimum value */ 931 png_int_32 pcal_X1; /* maximum value */ 932 png_charp pcal_units; /* Latin-1 string giving physical units */ 933 png_charpp pcal_params; /* ASCII strings containing parameter values */ 934 png_byte pcal_type; /* equation type (see PNG_EQUATION_ below) */ 935 png_byte pcal_nparams; /* number of parameters given in pcal_params */ 936 #endif 937 938 /* New members added in libpng-1.0.6 */ 939 #ifdef PNG_FREE_ME_SUPPORTED 940 png_uint_32 free_me; /* flags items libpng is responsible for freeing */ 941 #endif 942 943 #if defined(PNG_UNKNOWN_CHUNKS_SUPPORTED) 944 /* storage for unknown chunks that the library doesn't recognize. */ 945 png_unknown_chunkp unknown_chunks; 946 png_size_t unknown_chunks_num; 947 #endif 948 949 #if defined(PNG_iCCP_SUPPORTED) 950 /* iCCP chunk data. */ 951 png_charp iccp_name; /* profile name */ 952 png_charp iccp_profile; /* International Color Consortium profile data */ 953 /* Note to maintainer: should be png_bytep */ 954 png_uint_32 iccp_proflen; /* ICC profile data length */ 955 png_byte iccp_compression; /* Always zero */ 956 #endif 957 958 #if defined(PNG_sPLT_SUPPORTED) 959 /* data on sPLT chunks (there may be more than one). */ 960 png_sPLT_tp splt_palettes; 961 png_uint_32 splt_palettes_num; 962 #endif 963 964 #if defined(PNG_sCAL_SUPPORTED) 965 /* The sCAL chunk describes the actual physical dimensions of the 966 * subject matter of the graphic. The chunk contains a unit specification 967 * a byte value, and two ASCII strings representing floating-point 968 * values. The values are width and height corresponsing to one pixel 969 * in the image. This external representation is converted to double 970 * here. Data values are valid if (valid & PNG_INFO_sCAL) is non-zero. 971 */ 972 png_byte scal_unit; /* unit of physical scale */ 973 #ifdef PNG_FLOATING_POINT_SUPPORTED 974 double scal_pixel_width; /* width of one pixel */ 975 double scal_pixel_height; /* height of one pixel */ 976 #endif 977 #ifdef PNG_FIXED_POINT_SUPPORTED 978 png_charp scal_s_width; /* string containing height */ 979 png_charp scal_s_height; /* string containing width */ 980 #endif 981 #endif 982 983 #if defined(PNG_INFO_IMAGE_SUPPORTED) 984 /* Memory has been allocated if (valid & PNG_ALLOCATED_INFO_ROWS) non-zero */ 985 /* Data valid if (valid & PNG_INFO_IDAT) non-zero */ 986 png_bytepp row_pointers; /* the image bits */ 987 #endif 988 989 #if defined(PNG_FIXED_POINT_SUPPORTED) && defined(PNG_gAMA_SUPPORTED) 990 png_fixed_point int_gamma; /* gamma of image, if (valid & PNG_INFO_gAMA) */ 991 #endif 992 993 #if defined(PNG_cHRM_SUPPORTED) && defined(PNG_FIXED_POINT_SUPPORTED) 994 png_fixed_point int_x_white; 995 png_fixed_point int_y_white; 996 png_fixed_point int_x_red; 997 png_fixed_point int_y_red; 998 png_fixed_point int_x_green; 999 png_fixed_point int_y_green; 1000 png_fixed_point int_x_blue; 1001 png_fixed_point int_y_blue; 1002 #endif 1003 1004 } png_info; 1005 1006 typedef png_info FAR * png_infop; 1007 typedef png_info FAR * FAR * png_infopp; 1008 1009 /* Maximum positive integer used in PNG is (2^31)-1 */ 1010 #define PNG_UINT_31_MAX ((png_uint_32)0x7fffffffL) 1011 #define PNG_UINT_32_MAX ((png_uint_32)(-1)) 1012 #define PNG_SIZE_MAX ((png_size_t)(-1)) 1013 #if defined(PNG_1_0_X) || defined (PNG_1_2_X) 1014 /* PNG_MAX_UINT is deprecated; use PNG_UINT_31_MAX instead. */ 1015 #define PNG_MAX_UINT PNG_UINT_31_MAX 1016 #endif 1017 1018 /* These describe the color_type field in png_info. */ 1019 /* color type masks */ 1020 #define PNG_COLOR_MASK_PALETTE 1 1021 #define PNG_COLOR_MASK_COLOR 2 1022 #define PNG_COLOR_MASK_ALPHA 4 1023 1024 /* color types. Note that not all combinations are legal */ 1025 #define PNG_COLOR_TYPE_GRAY 0 1026 #define PNG_COLOR_TYPE_PALETTE (PNG_COLOR_MASK_COLOR | PNG_COLOR_MASK_PALETTE) 1027 #define PNG_COLOR_TYPE_RGB (PNG_COLOR_MASK_COLOR) 1028 #define PNG_COLOR_TYPE_RGB_ALPHA (PNG_COLOR_MASK_COLOR | PNG_COLOR_MASK_ALPHA) 1029 #define PNG_COLOR_TYPE_GRAY_ALPHA (PNG_COLOR_MASK_ALPHA) 1030 /* aliases */ 1031 #define PNG_COLOR_TYPE_RGBA PNG_COLOR_TYPE_RGB_ALPHA 1032 #define PNG_COLOR_TYPE_GA PNG_COLOR_TYPE_GRAY_ALPHA 1033 1034 /* This is for compression type. PNG 1.0-1.2 only define the single type. */ 1035 #define PNG_COMPRESSION_TYPE_BASE 0 /* Deflate method 8, 32K window */ 1036 #define PNG_COMPRESSION_TYPE_DEFAULT PNG_COMPRESSION_TYPE_BASE 1037 1038 /* This is for filter type. PNG 1.0-1.2 only define the single type. */ 1039 #define PNG_FILTER_TYPE_BASE 0 /* Single row per-byte filtering */ 1040 #define PNG_INTRAPIXEL_DIFFERENCING 64 /* Used only in MNG datastreams */ 1041 #define PNG_FILTER_TYPE_DEFAULT PNG_FILTER_TYPE_BASE 1042 1043 /* These are for the interlacing type. These values should NOT be changed. */ 1044 #define PNG_INTERLACE_NONE 0 /* Non-interlaced image */ 1045 #define PNG_INTERLACE_ADAM7 1 /* Adam7 interlacing */ 1046 #define PNG_INTERLACE_LAST 2 /* Not a valid value */ 1047 1048 /* These are for the oFFs chunk. These values should NOT be changed. */ 1049 #define PNG_OFFSET_PIXEL 0 /* Offset in pixels */ 1050 #define PNG_OFFSET_MICROMETER 1 /* Offset in micrometers (1/10^6 meter) */ 1051 #define PNG_OFFSET_LAST 2 /* Not a valid value */ 1052 1053 /* These are for the pCAL chunk. These values should NOT be changed. */ 1054 #define PNG_EQUATION_LINEAR 0 /* Linear transformation */ 1055 #define PNG_EQUATION_BASE_E 1 /* Exponential base e transform */ 1056 #define PNG_EQUATION_ARBITRARY 2 /* Arbitrary base exponential transform */ 1057 #define PNG_EQUATION_HYPERBOLIC 3 /* Hyperbolic sine transformation */ 1058 #define PNG_EQUATION_LAST 4 /* Not a valid value */ 1059 1060 /* These are for the sCAL chunk. These values should NOT be changed. */ 1061 #define PNG_SCALE_UNKNOWN 0 /* unknown unit (image scale) */ 1062 #define PNG_SCALE_METER 1 /* meters per pixel */ 1063 #define PNG_SCALE_RADIAN 2 /* radians per pixel */ 1064 #define PNG_SCALE_LAST 3 /* Not a valid value */ 1065 1066 /* These are for the pHYs chunk. These values should NOT be changed. */ 1067 #define PNG_RESOLUTION_UNKNOWN 0 /* pixels/unknown unit (aspect ratio) */ 1068 #define PNG_RESOLUTION_METER 1 /* pixels/meter */ 1069 #define PNG_RESOLUTION_LAST 2 /* Not a valid value */ 1070 1071 /* These are for the sRGB chunk. These values should NOT be changed. */ 1072 #define PNG_sRGB_INTENT_PERCEPTUAL 0 1073 #define PNG_sRGB_INTENT_RELATIVE 1 1074 #define PNG_sRGB_INTENT_SATURATION 2 1075 #define PNG_sRGB_INTENT_ABSOLUTE 3 1076 #define PNG_sRGB_INTENT_LAST 4 /* Not a valid value */ 1077 1078 /* This is for text chunks */ 1079 #define PNG_KEYWORD_MAX_LENGTH 79 1080 1081 /* Maximum number of entries in PLTE/sPLT/tRNS arrays */ 1082 #define PNG_MAX_PALETTE_LENGTH 256 1083 1084 /* These determine if an ancillary chunk's data has been successfully read 1085 * from the PNG header, or if the application has filled in the corresponding 1086 * data in the info_struct to be written into the output file. The values 1087 * of the PNG_INFO_<chunk> defines should NOT be changed. 1088 */ 1089 #define PNG_INFO_gAMA 0x0001 1090 #define PNG_INFO_sBIT 0x0002 1091 #define PNG_INFO_cHRM 0x0004 1092 #define PNG_INFO_PLTE 0x0008 1093 #define PNG_INFO_tRNS 0x0010 1094 #define PNG_INFO_bKGD 0x0020 1095 #define PNG_INFO_hIST 0x0040 1096 #define PNG_INFO_pHYs 0x0080 1097 #define PNG_INFO_oFFs 0x0100 1098 #define PNG_INFO_tIME 0x0200 1099 #define PNG_INFO_pCAL 0x0400 1100 #define PNG_INFO_sRGB 0x0800 /* GR-P, 0.96a */ 1101 #define PNG_INFO_iCCP 0x1000 /* ESR, 1.0.6 */ 1102 #define PNG_INFO_sPLT 0x2000 /* ESR, 1.0.6 */ 1103 #define PNG_INFO_sCAL 0x4000 /* ESR, 1.0.6 */ 1104 #define PNG_INFO_IDAT 0x8000L /* ESR, 1.0.6 */ 1105 1106 /* This is used for the transformation routines, as some of them 1107 * change these values for the row. It also should enable using 1108 * the routines for other purposes. 1109 */ 1110 typedef struct png_row_info_struct 1111 { 1112 png_uint_32 width; /* width of row */ 1113 png_uint_32 rowbytes; /* number of bytes in row */ 1114 png_byte color_type; /* color type of row */ 1115 png_byte bit_depth; /* bit depth of row */ 1116 png_byte channels; /* number of channels (1, 2, 3, or 4) */ 1117 png_byte pixel_depth; /* bits per pixel (depth * channels) */ 1118 } png_row_info; 1119 1120 typedef png_row_info FAR * png_row_infop; 1121 typedef png_row_info FAR * FAR * png_row_infopp; 1122 1123 /* These are the function types for the I/O functions and for the functions 1124 * that allow the user to override the default I/O functions with his or her 1125 * own. The png_error_ptr type should match that of user-supplied warning 1126 * and error functions, while the png_rw_ptr type should match that of the 1127 * user read/write data functions. 1128 */ 1129 typedef struct png_struct_def png_struct; 1130 typedef png_struct FAR * png_structp; 1131 1132 typedef void (PNGAPI *png_error_ptr) PNGARG((png_structp, png_const_charp)); 1133 typedef void (PNGAPI *png_rw_ptr) PNGARG((png_structp, png_bytep, png_size_t)); 1134 typedef void (PNGAPI *png_flush_ptr) PNGARG((png_structp)); 1135 typedef void (PNGAPI *png_read_status_ptr) PNGARG((png_structp, png_uint_32, 1136 int)); 1137 typedef void (PNGAPI *png_write_status_ptr) PNGARG((png_structp, png_uint_32, 1138 int)); 1139 1140 #ifdef PNG_PROGRESSIVE_READ_SUPPORTED 1141 typedef void (PNGAPI *png_progressive_info_ptr) PNGARG((png_structp, png_infop)); 1142 typedef void (PNGAPI *png_progressive_end_ptr) PNGARG((png_structp, png_infop)); 1143 typedef void (PNGAPI *png_progressive_row_ptr) PNGARG((png_structp, png_bytep, 1144 png_uint_32, int)); 1145 #endif 1146 1147 #if defined(PNG_READ_USER_TRANSFORM_SUPPORTED) || \ 1148 defined(PNG_WRITE_USER_TRANSFORM_SUPPORTED) || \ 1149 defined(PNG_LEGACY_SUPPORTED) 1150 typedef void (PNGAPI *png_user_transform_ptr) PNGARG((png_structp, 1151 png_row_infop, png_bytep)); 1152 #endif 1153 1154 #if defined(PNG_USER_CHUNKS_SUPPORTED) 1155 typedef int (PNGAPI *png_user_chunk_ptr) PNGARG((png_structp, png_unknown_chunkp)); 1156 #endif 1157 #if defined(PNG_UNKNOWN_CHUNKS_SUPPORTED) 1158 typedef void (PNGAPI *png_unknown_chunk_ptr) PNGARG((png_structp)); 1159 #endif 1160 1161 /* Transform masks for the high-level interface */ 1162 #define PNG_TRANSFORM_IDENTITY 0x0000 /* read and write */ 1163 #define PNG_TRANSFORM_STRIP_16 0x0001 /* read only */ 1164 #define PNG_TRANSFORM_STRIP_ALPHA 0x0002 /* read only */ 1165 #define PNG_TRANSFORM_PACKING 0x0004 /* read and write */ 1166 #define PNG_TRANSFORM_PACKSWAP 0x0008 /* read and write */ 1167 #define PNG_TRANSFORM_EXPAND 0x0010 /* read only */ 1168 #define PNG_TRANSFORM_INVERT_MONO 0x0020 /* read and write */ 1169 #define PNG_TRANSFORM_SHIFT 0x0040 /* read and write */ 1170 #define PNG_TRANSFORM_BGR 0x0080 /* read and write */ 1171 #define PNG_TRANSFORM_SWAP_ALPHA 0x0100 /* read and write */ 1172 #define PNG_TRANSFORM_SWAP_ENDIAN 0x0200 /* read and write */ 1173 #define PNG_TRANSFORM_INVERT_ALPHA 0x0400 /* read and write */ 1174 #define PNG_TRANSFORM_STRIP_FILLER 0x0800 /* WRITE only, deprecated */ 1175 /* Added to libpng-1.2.34 */ 1176 #define PNG_TRANSFORM_STRIP_FILLER_BEFORE 0x0800 /* WRITE only */ 1177 #define PNG_TRANSFORM_STRIP_FILLER_AFTER 0x1000 /* WRITE only */ 1178 1179 /* Flags for MNG supported features */ 1180 #define PNG_FLAG_MNG_EMPTY_PLTE 0x01 1181 #define PNG_FLAG_MNG_FILTER_64 0x04 1182 #define PNG_ALL_MNG_FEATURES 0x05 1183 1184 typedef png_voidp (*png_malloc_ptr) PNGARG((png_structp, png_size_t)); 1185 typedef void (*png_free_ptr) PNGARG((png_structp, png_voidp)); 1186 1187 /* The structure that holds the information to read and write PNG files. 1188 * The only people who need to care about what is inside of this are the 1189 * people who will be modifying the library for their own special needs. 1190 * It should NOT be accessed directly by an application, except to store 1191 * the jmp_buf. 1192 */ 1193 1194 struct png_struct_def 1195 { 1196 #ifdef PNG_SETJMP_SUPPORTED 1197 jmp_buf jmpbuf; /* used in png_error */ 1198 #endif 1199 png_error_ptr error_fn; /* function for printing errors and aborting */ 1200 png_error_ptr warning_fn; /* function for printing warnings */ 1201 png_voidp error_ptr; /* user supplied struct for error functions */ 1202 png_rw_ptr write_data_fn; /* function for writing output data */ 1203 png_rw_ptr read_data_fn; /* function for reading input data */ 1204 png_voidp io_ptr; /* ptr to application struct for I/O functions */ 1205 1206 #if defined(PNG_READ_USER_TRANSFORM_SUPPORTED) 1207 png_user_transform_ptr read_user_transform_fn; /* user read transform */ 1208 #endif 1209 1210 #if defined(PNG_WRITE_USER_TRANSFORM_SUPPORTED) 1211 png_user_transform_ptr write_user_transform_fn; /* user write transform */ 1212 #endif 1213 1214 /* These were added in libpng-1.0.2 */ 1215 #if defined(PNG_USER_TRANSFORM_PTR_SUPPORTED) 1216 #if defined(PNG_READ_USER_TRANSFORM_SUPPORTED) || \ 1217 defined(PNG_WRITE_USER_TRANSFORM_SUPPORTED) 1218 png_voidp user_transform_ptr; /* user supplied struct for user transform */ 1219 png_byte user_transform_depth; /* bit depth of user transformed pixels */ 1220 png_byte user_transform_channels; /* channels in user transformed pixels */ 1221 #endif 1222 #endif 1223 1224 png_uint_32 mode; /* tells us where we are in the PNG file */ 1225 png_uint_32 flags; /* flags indicating various things to libpng */ 1226 png_uint_32 transformations; /* which transformations to perform */ 1227 1228 z_stream zstream; /* pointer to decompression structure (below) */ 1229 png_bytep zbuf; /* buffer for zlib */ 1230 png_size_t zbuf_size; /* size of zbuf */ 1231 int zlib_level; /* holds zlib compression level */ 1232 int zlib_method; /* holds zlib compression method */ 1233 int zlib_window_bits; /* holds zlib compression window bits */ 1234 int zlib_mem_level; /* holds zlib compression memory level */ 1235 int zlib_strategy; /* holds zlib compression strategy */ 1236 1237 png_uint_32 width; /* width of image in pixels */ 1238 png_uint_32 height; /* height of image in pixels */ 1239 png_uint_32 num_rows; /* number of rows in current pass */ 1240 png_uint_32 usr_width; /* width of row at start of write */ 1241 png_uint_32 rowbytes; /* size of row in bytes */ 1242 png_uint_32 irowbytes; /* size of current interlaced row in bytes */ 1243 png_uint_32 iwidth; /* width of current interlaced row in pixels */ 1244 png_uint_32 row_number; /* current row in interlace pass */ 1245 png_bytep prev_row; /* buffer to save previous (unfiltered) row */ 1246 png_bytep row_buf; /* buffer to save current (unfiltered) row */ 1247 #ifndef PNG_NO_WRITE_FILTER 1248 png_bytep sub_row; /* buffer to save "sub" row when filtering */ 1249 png_bytep up_row; /* buffer to save "up" row when filtering */ 1250 png_bytep avg_row; /* buffer to save "avg" row when filtering */ 1251 png_bytep paeth_row; /* buffer to save "Paeth" row when filtering */ 1252 #endif 1253 png_row_info row_info; /* used for transformation routines */ 1254 1255 png_uint_32 idat_size; /* current IDAT size for read */ 1256 png_uint_32 crc; /* current chunk CRC value */ 1257 png_colorp palette; /* palette from the input file */ 1258 png_uint_16 num_palette; /* number of color entries in palette */ 1259 png_uint_16 num_trans; /* number of transparency values */ 1260 png_byte chunk_name[5]; /* null-terminated name of current chunk */ 1261 png_byte compression; /* file compression type (always 0) */ 1262 png_byte filter; /* file filter type (always 0) */ 1263 png_byte interlaced; /* PNG_INTERLACE_NONE, PNG_INTERLACE_ADAM7 */ 1264 png_byte pass; /* current interlace pass (0 - 6) */ 1265 png_byte do_filter; /* row filter flags (see PNG_FILTER_ below ) */ 1266 png_byte color_type; /* color type of file */ 1267 png_byte bit_depth; /* bit depth of file */ 1268 png_byte usr_bit_depth; /* bit depth of users row */ 1269 png_byte pixel_depth; /* number of bits per pixel */ 1270 png_byte channels; /* number of channels in file */ 1271 png_byte usr_channels; /* channels at start of write */ 1272 png_byte sig_bytes; /* magic bytes read/written from start of file */ 1273 1274 #if defined(PNG_READ_FILLER_SUPPORTED) || defined(PNG_WRITE_FILLER_SUPPORTED) 1275 #ifdef PNG_LEGACY_SUPPORTED 1276 png_byte filler; /* filler byte for pixel expansion */ 1277 #else 1278 png_uint_16 filler; /* filler bytes for pixel expansion */ 1279 #endif 1280 #endif 1281 1282 #if defined(PNG_bKGD_SUPPORTED) 1283 png_byte background_gamma_type; 1284 # ifdef PNG_FLOATING_POINT_SUPPORTED 1285 float background_gamma; 1286 # endif 1287 png_color_16 background; /* background color in screen gamma space */ 1288 #if defined(PNG_READ_GAMMA_SUPPORTED) 1289 png_color_16 background_1; /* background normalized to gamma 1.0 */ 1290 #endif 1291 #endif /* PNG_bKGD_SUPPORTED */ 1292 1293 #if defined(PNG_WRITE_FLUSH_SUPPORTED) 1294 png_flush_ptr output_flush_fn;/* Function for flushing output */ 1295 png_uint_32 flush_dist; /* how many rows apart to flush, 0 - no flush */ 1296 png_uint_32 flush_rows; /* number of rows written since last flush */ 1297 #endif 1298 1299 #if defined(PNG_READ_GAMMA_SUPPORTED) || defined(PNG_READ_BACKGROUND_SUPPORTED) 1300 int gamma_shift; /* number of "insignificant" bits 16-bit gamma */ 1301 #ifdef PNG_FLOATING_POINT_SUPPORTED 1302 float gamma; /* file gamma value */ 1303 float screen_gamma; /* screen gamma value (display_exponent) */ 1304 #endif 1305 #endif 1306 1307 #if defined(PNG_READ_GAMMA_SUPPORTED) || defined(PNG_READ_BACKGROUND_SUPPORTED) 1308 png_bytep gamma_table; /* gamma table for 8-bit depth files */ 1309 png_bytep gamma_from_1; /* converts from 1.0 to screen */ 1310 png_bytep gamma_to_1; /* converts from file to 1.0 */ 1311 png_uint_16pp gamma_16_table; /* gamma table for 16-bit depth files */ 1312 png_uint_16pp gamma_16_from_1; /* converts from 1.0 to screen */ 1313 png_uint_16pp gamma_16_to_1; /* converts from file to 1.0 */ 1314 #endif 1315 1316 #if defined(PNG_READ_GAMMA_SUPPORTED) || defined(PNG_sBIT_SUPPORTED) 1317 png_color_8 sig_bit; /* significant bits in each available channel */ 1318 #endif 1319 1320 #if defined(PNG_READ_SHIFT_SUPPORTED) || defined(PNG_WRITE_SHIFT_SUPPORTED) 1321 png_color_8 shift; /* shift for significant bit tranformation */ 1322 #endif 1323 1324 #if defined(PNG_tRNS_SUPPORTED) || defined(PNG_READ_BACKGROUND_SUPPORTED) \ 1325 || defined(PNG_READ_EXPAND_SUPPORTED) || defined(PNG_READ_BACKGROUND_SUPPORTED) 1326 png_bytep trans; /* transparency values for paletted files */ 1327 png_color_16 trans_values; /* transparency values for non-paletted files */ 1328 #endif 1329 1330 png_read_status_ptr read_row_fn; /* called after each row is decoded */ 1331 png_write_status_ptr write_row_fn; /* called after each row is encoded */ 1332 #ifdef PNG_PROGRESSIVE_READ_SUPPORTED 1333 png_progressive_info_ptr info_fn; /* called after header data fully read */ 1334 png_progressive_row_ptr row_fn; /* called after each prog. row is decoded */ 1335 png_progressive_end_ptr end_fn; /* called after image is complete */ 1336 png_bytep save_buffer_ptr; /* current location in save_buffer */ 1337 png_bytep save_buffer; /* buffer for previously read data */ 1338 png_bytep current_buffer_ptr; /* current location in current_buffer */ 1339 png_bytep current_buffer; /* buffer for recently used data */ 1340 png_uint_32 push_length; /* size of current input chunk */ 1341 png_uint_32 skip_length; /* bytes to skip in input data */ 1342 png_size_t save_buffer_size; /* amount of data now in save_buffer */ 1343 png_size_t save_buffer_max; /* total size of save_buffer */ 1344 png_size_t buffer_size; /* total amount of available input data */ 1345 png_size_t current_buffer_size; /* amount of data now in current_buffer */ 1346 int process_mode; /* what push library is currently doing */ 1347 int cur_palette; /* current push library palette index */ 1348 1349 # if defined(PNG_TEXT_SUPPORTED) 1350 png_size_t current_text_size; /* current size of text input data */ 1351 png_size_t current_text_left; /* how much text left to read in input */ 1352 png_charp current_text; /* current text chunk buffer */ 1353 png_charp current_text_ptr; /* current location in current_text */ 1354 # endif /* PNG_TEXT_SUPPORTED */ 1355 #endif /* PNG_PROGRESSIVE_READ_SUPPORTED */ 1356 1357 #if defined(__TURBOC__) && !defined(_Windows) && !defined(__FLAT__) 1358 /* for the Borland special 64K segment handler */ 1359 png_bytepp offset_table_ptr; 1360 png_bytep offset_table; 1361 png_uint_16 offset_table_number; 1362 png_uint_16 offset_table_count; 1363 png_uint_16 offset_table_count_free; 1364 #endif 1365 1366 #if defined(PNG_READ_DITHER_SUPPORTED) 1367 png_bytep palette_lookup; /* lookup table for dithering */ 1368 png_bytep dither_index; /* index translation for palette files */ 1369 #endif 1370 1371 #if defined(PNG_READ_DITHER_SUPPORTED) || defined(PNG_hIST_SUPPORTED) 1372 png_uint_16p hist; /* histogram */ 1373 #endif 1374 1375 #if defined(PNG_WRITE_WEIGHTED_FILTER_SUPPORTED) 1376 png_byte heuristic_method; /* heuristic for row filter selection */ 1377 png_byte num_prev_filters; /* number of weights for previous rows */ 1378 png_bytep prev_filters; /* filter type(s) of previous row(s) */ 1379 png_uint_16p filter_weights; /* weight(s) for previous line(s) */ 1380 png_uint_16p inv_filter_weights; /* 1/weight(s) for previous line(s) */ 1381 png_uint_16p filter_costs; /* relative filter calculation cost */ 1382 png_uint_16p inv_filter_costs; /* 1/relative filter calculation cost */ 1383 #endif 1384 1385 #if defined(PNG_TIME_RFC1123_SUPPORTED) 1386 png_charp time_buffer; /* String to hold RFC 1123 time text */ 1387 #endif 1388 1389 /* New members added in libpng-1.0.6 */ 1390 1391 #ifdef PNG_FREE_ME_SUPPORTED 1392 png_uint_32 free_me; /* flags items libpng is responsible for freeing */ 1393 #endif 1394 1395 #if defined(PNG_USER_CHUNKS_SUPPORTED) 1396 png_voidp user_chunk_ptr; 1397 png_user_chunk_ptr read_user_chunk_fn; /* user read chunk handler */ 1398 #endif 1399 1400 #if defined(PNG_UNKNOWN_CHUNKS_SUPPORTED) 1401 int num_chunk_list; 1402 png_bytep chunk_list; 1403 #endif 1404 1405 /* New members added in libpng-1.0.3 */ 1406 #if defined(PNG_READ_RGB_TO_GRAY_SUPPORTED) 1407 png_byte rgb_to_gray_status; 1408 /* These were changed from png_byte in libpng-1.0.6 */ 1409 png_uint_16 rgb_to_gray_red_coeff; 1410 png_uint_16 rgb_to_gray_green_coeff; 1411 png_uint_16 rgb_to_gray_blue_coeff; 1412 #endif 1413 1414 /* New member added in libpng-1.0.4 (renamed in 1.0.9) */ 1415 #if defined(PNG_MNG_FEATURES_SUPPORTED) || \ 1416 defined(PNG_READ_EMPTY_PLTE_SUPPORTED) || \ 1417 defined(PNG_WRITE_EMPTY_PLTE_SUPPORTED) 1418 /* changed from png_byte to png_uint_32 at version 1.2.0 */ 1419 #ifdef PNG_1_0_X 1420 png_byte mng_features_permitted; 1421 #else 1422 png_uint_32 mng_features_permitted; 1423 #endif /* PNG_1_0_X */ 1424 #endif 1425 1426 /* New member added in libpng-1.0.7 */ 1427 #if defined(PNG_READ_GAMMA_SUPPORTED) || defined(PNG_READ_BACKGROUND_SUPPORTED) 1428 png_fixed_point int_gamma; 1429 #endif 1430 1431 /* New member added in libpng-1.0.9, ifdef'ed out in 1.0.12, enabled in 1.2.0 */ 1432 #if defined(PNG_MNG_FEATURES_SUPPORTED) 1433 png_byte filter_type; 1434 #endif 1435 1436 #if defined(PNG_1_0_X) 1437 /* New member added in libpng-1.0.10, ifdef'ed out in 1.2.0 */ 1438 png_uint_32 row_buf_size; 1439 #endif 1440 1441 /* New members added in libpng-1.2.0 */ 1442 #if defined(PNG_ASSEMBLER_CODE_SUPPORTED) 1443 # if !defined(PNG_1_0_X) 1444 # if defined(PNG_MMX_CODE_SUPPORTED) 1445 png_byte mmx_bitdepth_threshold; 1446 png_uint_32 mmx_rowbytes_threshold; 1447 # endif 1448 png_uint_32 asm_flags; 1449 # endif 1450 #endif 1451 1452 /* New members added in libpng-1.0.2 but first enabled by default in 1.2.0 */ 1453 #ifdef PNG_USER_MEM_SUPPORTED 1454 png_voidp mem_ptr; /* user supplied struct for mem functions */ 1455 png_malloc_ptr malloc_fn; /* function for allocating memory */ 1456 png_free_ptr free_fn; /* function for freeing memory */ 1457 #endif 1458 1459 /* New member added in libpng-1.0.13 and 1.2.0 */ 1460 png_bytep big_row_buf; /* buffer to save current (unfiltered) row */ 1461 1462 #if defined(PNG_READ_DITHER_SUPPORTED) 1463 /* The following three members were added at version 1.0.14 and 1.2.4 */ 1464 png_bytep dither_sort; /* working sort array */ 1465 png_bytep index_to_palette; /* where the original index currently is */ 1466 /* in the palette */ 1467 png_bytep palette_to_index; /* which original index points to this */ 1468 /* palette color */ 1469 #endif 1470 1471 /* New members added in libpng-1.0.16 and 1.2.6 */ 1472 png_byte compression_type; 1473 1474 #ifdef PNG_SET_USER_LIMITS_SUPPORTED 1475 png_uint_32 user_width_max; 1476 png_uint_32 user_height_max; 1477 #endif 1478 1479 /* New member added in libpng-1.0.25 and 1.2.17 */ 1480 #if defined(PNG_UNKNOWN_CHUNKS_SUPPORTED) 1481 /* storage for unknown chunk that the library doesn't recognize. */ 1482 png_unknown_chunk unknown_chunk; 1483 #endif 1484 1485 /* New members added in libpng-1.2.26 */ 1486 png_uint_32 old_big_row_buf_size, old_prev_row_size; 1487 1488 /* New member added in libpng-1.2.30 */ 1489 png_charp chunkdata; /* buffer for reading chunk data */ 1490 1491 }; 1492 1493 1494 /* This triggers a compiler error in png.c, if png.c and png.h 1495 * do not agree upon the version number. 1496 */ 1497 typedef png_structp version_1_2_37; 1498 1499 typedef png_struct FAR * FAR * png_structpp; 1500 1501 /* Here are the function definitions most commonly used. This is not 1502 * the place to find out how to use libpng. See libpng.txt for the 1503 * full explanation, see example.c for the summary. This just provides 1504 * a simple one line description of the use of each function. 1505 */ 1506 1507 /* Returns the version number of the library */ 1508 extern PNG_EXPORT(png_uint_32,png_access_version_number) PNGARG((void)); 1509 1510 /* Tell lib we have already handled the first <num_bytes> magic bytes. 1511 * Handling more than 8 bytes from the beginning of the file is an error. 1512 */ 1513 extern PNG_EXPORT(void,png_set_sig_bytes) PNGARG((png_structp png_ptr, 1514 int num_bytes)); 1515 1516 /* Check sig[start] through sig[start + num_to_check - 1] to see if it's a 1517 * PNG file. Returns zero if the supplied bytes match the 8-byte PNG 1518 * signature, and non-zero otherwise. Having num_to_check == 0 or 1519 * start > 7 will always fail (ie return non-zero). 1520 */ 1521 extern PNG_EXPORT(int,png_sig_cmp) PNGARG((png_bytep sig, png_size_t start, 1522 png_size_t num_to_check)); 1523 1524 /* Simple signature checking function. This is the same as calling 1525 * png_check_sig(sig, n) := !png_sig_cmp(sig, 0, n). 1526 */ 1527 extern PNG_EXPORT(int,png_check_sig) PNGARG((png_bytep sig, int num)); 1528 1529 /* Allocate and initialize png_ptr struct for reading, and any other memory. */ 1530 extern PNG_EXPORT(png_structp,png_create_read_struct) 1531 PNGARG((png_const_charp user_png_ver, png_voidp error_ptr, 1532 png_error_ptr error_fn, png_error_ptr warn_fn)); 1533 1534 /* Allocate and initialize png_ptr struct for writing, and any other memory */ 1535 extern PNG_EXPORT(png_structp,png_create_write_struct) 1536 PNGARG((png_const_charp user_png_ver, png_voidp error_ptr, 1537 png_error_ptr error_fn, png_error_ptr warn_fn)); 1538 1539 #ifdef PNG_WRITE_SUPPORTED 1540 extern PNG_EXPORT(png_uint_32,png_get_compression_buffer_size) 1541 PNGARG((png_structp png_ptr)); 1542 #endif 1543 1544 #ifdef PNG_WRITE_SUPPORTED 1545 extern PNG_EXPORT(void,png_set_compression_buffer_size) 1546 PNGARG((png_structp png_ptr, png_uint_32 size)); 1547 #endif 1548 1549 /* Reset the compression stream */ 1550 extern PNG_EXPORT(int,png_reset_zstream) PNGARG((png_structp png_ptr)); 1551 1552 /* New functions added in libpng-1.0.2 (not enabled by default until 1.2.0) */ 1553 #ifdef PNG_USER_MEM_SUPPORTED 1554 extern PNG_EXPORT(png_structp,png_create_read_struct_2) 1555 PNGARG((png_const_charp user_png_ver, png_voidp error_ptr, 1556 png_error_ptr error_fn, png_error_ptr warn_fn, png_voidp mem_ptr, 1557 png_malloc_ptr malloc_fn, png_free_ptr free_fn)); 1558 extern PNG_EXPORT(png_structp,png_create_write_struct_2) 1559 PNGARG((png_const_charp user_png_ver, png_voidp error_ptr, 1560 png_error_ptr error_fn, png_error_ptr warn_fn, png_voidp mem_ptr, 1561 png_malloc_ptr malloc_fn, png_free_ptr free_fn)); 1562 #endif 1563 1564 /* Write a PNG chunk - size, type, (optional) data, CRC. */ 1565 extern PNG_EXPORT(void,png_write_chunk) PNGARG((png_structp png_ptr, 1566 png_bytep chunk_name, png_bytep data, png_size_t length)); 1567 1568 /* Write the start of a PNG chunk - length and chunk name. */ 1569 extern PNG_EXPORT(void,png_write_chunk_start) PNGARG((png_structp png_ptr, 1570 png_bytep chunk_name, png_uint_32 length)); 1571 1572 /* Write the data of a PNG chunk started with png_write_chunk_start(). */ 1573 extern PNG_EXPORT(void,png_write_chunk_data) PNGARG((png_structp png_ptr, 1574 png_bytep data, png_size_t length)); 1575 1576 /* Finish a chunk started with png_write_chunk_start() (includes CRC). */ 1577 extern PNG_EXPORT(void,png_write_chunk_end) PNGARG((png_structp png_ptr)); 1578 1579 /* Allocate and initialize the info structure */ 1580 extern PNG_EXPORT(png_infop,png_create_info_struct) 1581 PNGARG((png_structp png_ptr)); 1582 1583 #if defined(PNG_1_0_X) || defined (PNG_1_2_X) 1584 /* Initialize the info structure (old interface - DEPRECATED) */ 1585 extern PNG_EXPORT(void,png_info_init) PNGARG((png_infop info_ptr)); 1586 #undef png_info_init 1587 #define png_info_init(info_ptr) png_info_init_3(&info_ptr,\ 1588 png_sizeof(png_info)); 1589 #endif 1590 1591 extern PNG_EXPORT(void,png_info_init_3) PNGARG((png_infopp info_ptr, 1592 png_size_t png_info_struct_size)); 1593 1594 /* Writes all the PNG information before the image. */ 1595 extern PNG_EXPORT(void,png_write_info_before_PLTE) PNGARG((png_structp png_ptr, 1596 png_infop info_ptr)); 1597 extern PNG_EXPORT(void,png_write_info) PNGARG((png_structp png_ptr, 1598 png_infop info_ptr)); 1599 1600 #ifndef PNG_NO_SEQUENTIAL_READ_SUPPORTED 1601 /* read the information before the actual image data. */ 1602 extern PNG_EXPORT(void,png_read_info) PNGARG((png_structp png_ptr, 1603 png_infop info_ptr)); 1604 #endif 1605 1606 #if defined(PNG_TIME_RFC1123_SUPPORTED) 1607 extern PNG_EXPORT(png_charp,png_convert_to_rfc1123) 1608 PNGARG((png_structp png_ptr, png_timep ptime)); 1609 #endif 1610 1611 #if !defined(_WIN32_WCE) 1612 /* "time.h" functions are not supported on WindowsCE */ 1613 #if defined(PNG_WRITE_tIME_SUPPORTED) 1614 /* convert from a struct tm to png_time */ 1615 extern PNG_EXPORT(void,png_convert_from_struct_tm) PNGARG((png_timep ptime, 1616 struct tm FAR * ttime)); 1617 1618 /* convert from time_t to png_time. Uses gmtime() */ 1619 extern PNG_EXPORT(void,png_convert_from_time_t) PNGARG((png_timep ptime, 1620 time_t ttime)); 1621 #endif /* PNG_WRITE_tIME_SUPPORTED */ 1622 #endif /* _WIN32_WCE */ 1623 1624 #if defined(PNG_READ_EXPAND_SUPPORTED) 1625 /* Expand data to 24-bit RGB, or 8-bit grayscale, with alpha if available. */ 1626 extern PNG_EXPORT(void,png_set_expand) PNGARG((png_structp png_ptr)); 1627 #if !defined(PNG_1_0_X) 1628 extern PNG_EXPORT(void,png_set_expand_gray_1_2_4_to_8) PNGARG((png_structp 1629 png_ptr)); 1630 #endif 1631 extern PNG_EXPORT(void,png_set_palette_to_rgb) PNGARG((png_structp png_ptr)); 1632 extern PNG_EXPORT(void,png_set_tRNS_to_alpha) PNGARG((png_structp png_ptr)); 1633 #if defined(PNG_1_0_X) || defined (PNG_1_2_X) 1634 /* Deprecated */ 1635 extern PNG_EXPORT(void,png_set_gray_1_2_4_to_8) PNGARG((png_structp png_ptr)); 1636 #endif 1637 #endif 1638 1639 #if defined(PNG_READ_BGR_SUPPORTED) || defined(PNG_WRITE_BGR_SUPPORTED) 1640 /* Use blue, green, red order for pixels. */ 1641 extern PNG_EXPORT(void,png_set_bgr) PNGARG((png_structp png_ptr)); 1642 #endif 1643 1644 #if defined(PNG_READ_GRAY_TO_RGB_SUPPORTED) 1645 /* Expand the grayscale to 24-bit RGB if necessary. */ 1646 extern PNG_EXPORT(void,png_set_gray_to_rgb) PNGARG((png_structp png_ptr)); 1647 #endif 1648 1649 #if defined(PNG_READ_RGB_TO_GRAY_SUPPORTED) 1650 /* Reduce RGB to grayscale. */ 1651 #ifdef PNG_FLOATING_POINT_SUPPORTED 1652 extern PNG_EXPORT(void,png_set_rgb_to_gray) PNGARG((png_structp png_ptr, 1653 int error_action, double red, double green )); 1654 #endif 1655 extern PNG_EXPORT(void,png_set_rgb_to_gray_fixed) PNGARG((png_structp png_ptr, 1656 int error_action, png_fixed_point red, png_fixed_point green )); 1657 extern PNG_EXPORT(png_byte,png_get_rgb_to_gray_status) PNGARG((png_structp 1658 png_ptr)); 1659 #endif 1660 1661 extern PNG_EXPORT(void,png_build_grayscale_palette) PNGARG((int bit_depth, 1662 png_colorp palette)); 1663 1664 #if defined(PNG_READ_STRIP_ALPHA_SUPPORTED) 1665 extern PNG_EXPORT(void,png_set_strip_alpha) PNGARG((png_structp png_ptr)); 1666 #endif 1667 1668 #if defined(PNG_READ_SWAP_ALPHA_SUPPORTED) || \ 1669 defined(PNG_WRITE_SWAP_ALPHA_SUPPORTED) 1670 extern PNG_EXPORT(void,png_set_swap_alpha) PNGARG((png_structp png_ptr)); 1671 #endif 1672 1673 #if defined(PNG_READ_INVERT_ALPHA_SUPPORTED) || \ 1674 defined(PNG_WRITE_INVERT_ALPHA_SUPPORTED) 1675 extern PNG_EXPORT(void,png_set_invert_alpha) PNGARG((png_structp png_ptr)); 1676 #endif 1677 1678 #if defined(PNG_READ_FILLER_SUPPORTED) || defined(PNG_WRITE_FILLER_SUPPORTED) 1679 /* Add a filler byte to 8-bit Gray or 24-bit RGB images. */ 1680 extern PNG_EXPORT(void,png_set_filler) PNGARG((png_structp png_ptr, 1681 png_uint_32 filler, int flags)); 1682 /* The values of the PNG_FILLER_ defines should NOT be changed */ 1683 #define PNG_FILLER_BEFORE 0 1684 #define PNG_FILLER_AFTER 1 1685 /* Add an alpha byte to 8-bit Gray or 24-bit RGB images. */ 1686 #if !defined(PNG_1_0_X) 1687 extern PNG_EXPORT(void,png_set_add_alpha) PNGARG((png_structp png_ptr, 1688 png_uint_32 filler, int flags)); 1689 #endif 1690 #endif /* PNG_READ_FILLER_SUPPORTED || PNG_WRITE_FILLER_SUPPORTED */ 1691 1692 #if defined(PNG_READ_SWAP_SUPPORTED) || defined(PNG_WRITE_SWAP_SUPPORTED) 1693 /* Swap bytes in 16-bit depth files. */ 1694 extern PNG_EXPORT(void,png_set_swap) PNGARG((png_structp png_ptr)); 1695 #endif 1696 1697 #if defined(PNG_READ_PACK_SUPPORTED) || defined(PNG_WRITE_PACK_SUPPORTED) 1698 /* Use 1 byte per pixel in 1, 2, or 4-bit depth files. */ 1699 extern PNG_EXPORT(void,png_set_packing) PNGARG((png_structp png_ptr)); 1700 #endif 1701 1702 #if defined(PNG_READ_PACKSWAP_SUPPORTED) || defined(PNG_WRITE_PACKSWAP_SUPPORTED) 1703 /* Swap packing order of pixels in bytes. */ 1704 extern PNG_EXPORT(void,png_set_packswap) PNGARG((png_structp png_ptr)); 1705 #endif 1706 1707 #if defined(PNG_READ_SHIFT_SUPPORTED) || defined(PNG_WRITE_SHIFT_SUPPORTED) 1708 /* Converts files to legal bit depths. */ 1709 extern PNG_EXPORT(void,png_set_shift) PNGARG((png_structp png_ptr, 1710 png_color_8p true_bits)); 1711 #endif 1712 1713 #if defined(PNG_READ_INTERLACING_SUPPORTED) || \ 1714 defined(PNG_WRITE_INTERLACING_SUPPORTED) 1715 /* Have the code handle the interlacing. Returns the number of passes. */ 1716 extern PNG_EXPORT(int,png_set_interlace_handling) PNGARG((png_structp png_ptr)); 1717 #endif 1718 1719 #if defined(PNG_READ_INVERT_SUPPORTED) || defined(PNG_WRITE_INVERT_SUPPORTED) 1720 /* Invert monochrome files */ 1721 extern PNG_EXPORT(void,png_set_invert_mono) PNGARG((png_structp png_ptr)); 1722 #endif 1723 1724 #if defined(PNG_READ_BACKGROUND_SUPPORTED) 1725 /* Handle alpha and tRNS by replacing with a background color. */ 1726 #ifdef PNG_FLOATING_POINT_SUPPORTED 1727 extern PNG_EXPORT(void,png_set_background) PNGARG((png_structp png_ptr, 1728 png_color_16p background_color, int background_gamma_code, 1729 int need_expand, double background_gamma)); 1730 #endif 1731 #define PNG_BACKGROUND_GAMMA_UNKNOWN 0 1732 #define PNG_BACKGROUND_GAMMA_SCREEN 1 1733 #define PNG_BACKGROUND_GAMMA_FILE 2 1734 #define PNG_BACKGROUND_GAMMA_UNIQUE 3 1735 #endif 1736 1737 #if defined(PNG_READ_16_TO_8_SUPPORTED) 1738 /* strip the second byte of information from a 16-bit depth file. */ 1739 extern PNG_EXPORT(void,png_set_strip_16) PNGARG((png_structp png_ptr)); 1740 #endif 1741 1742 #if defined(PNG_READ_DITHER_SUPPORTED) 1743 /* Turn on dithering, and reduce the palette to the number of colors available. */ 1744 extern PNG_EXPORT(void,png_set_dither) PNGARG((png_structp png_ptr, 1745 png_colorp palette, int num_palette, int maximum_colors, 1746 png_uint_16p histogram, int full_dither)); 1747 #endif 1748 1749 #if defined(PNG_READ_GAMMA_SUPPORTED) 1750 /* Handle gamma correction. Screen_gamma=(display_exponent) */ 1751 #ifdef PNG_FLOATING_POINT_SUPPORTED 1752 extern PNG_EXPORT(void,png_set_gamma) PNGARG((png_structp png_ptr, 1753 double screen_gamma, double default_file_gamma)); 1754 #endif 1755 #endif 1756 1757 #if defined(PNG_1_0_X) || defined (PNG_1_2_X) 1758 #if defined(PNG_READ_EMPTY_PLTE_SUPPORTED) || \ 1759 defined(PNG_WRITE_EMPTY_PLTE_SUPPORTED) 1760 /* Permit or disallow empty PLTE (0: not permitted, 1: permitted) */ 1761 /* Deprecated and will be removed. Use png_permit_mng_features() instead. */ 1762 extern PNG_EXPORT(void,png_permit_empty_plte) PNGARG((png_structp png_ptr, 1763 int empty_plte_permitted)); 1764 #endif 1765 #endif 1766 1767 #if defined(PNG_WRITE_FLUSH_SUPPORTED) 1768 /* Set how many lines between output flushes - 0 for no flushing */ 1769 extern PNG_EXPORT(void,png_set_flush) PNGARG((png_structp png_ptr, int nrows)); 1770 /* Flush the current PNG output buffer */ 1771 extern PNG_EXPORT(void,png_write_flush) PNGARG((png_structp png_ptr)); 1772 #endif 1773 1774 /* optional update palette with requested transformations */ 1775 extern PNG_EXPORT(void,png_start_read_image) PNGARG((png_structp png_ptr)); 1776 1777 /* optional call to update the users info structure */ 1778 extern PNG_EXPORT(void,png_read_update_info) PNGARG((png_structp png_ptr, 1779 png_infop info_ptr)); 1780 1781 #ifndef PNG_NO_SEQUENTIAL_READ_SUPPORTED 1782 /* read one or more rows of image data. */ 1783 extern PNG_EXPORT(void,png_read_rows) PNGARG((png_structp png_ptr, 1784 png_bytepp row, png_bytepp display_row, png_uint_32 num_rows)); 1785 #endif 1786 1787 #ifndef PNG_NO_SEQUENTIAL_READ_SUPPORTED 1788 /* read a row of data. */ 1789 extern PNG_EXPORT(void,png_read_row) PNGARG((png_structp png_ptr, 1790 png_bytep row, 1791 png_bytep display_row)); 1792 #endif 1793 1794 #ifndef PNG_NO_SEQUENTIAL_READ_SUPPORTED 1795 /* read the whole image into memory at once. */ 1796 extern PNG_EXPORT(void,png_read_image) PNGARG((png_structp png_ptr, 1797 png_bytepp image)); 1798 #endif 1799 1800 /* write a row of image data */ 1801 extern PNG_EXPORT(void,png_write_row) PNGARG((png_structp png_ptr, 1802 png_bytep row)); 1803 1804 /* write a few rows of image data */ 1805 extern PNG_EXPORT(void,png_write_rows) PNGARG((png_structp png_ptr, 1806 png_bytepp row, png_uint_32 num_rows)); 1807 1808 /* write the image data */ 1809 extern PNG_EXPORT(void,png_write_image) PNGARG((png_structp png_ptr, 1810 png_bytepp image)); 1811 1812 /* writes the end of the PNG file. */ 1813 extern PNG_EXPORT(void,png_write_end) PNGARG((png_structp png_ptr, 1814 png_infop info_ptr)); 1815 1816 #ifndef PNG_NO_SEQUENTIAL_READ_SUPPORTED 1817 /* read the end of the PNG file. */ 1818 extern PNG_EXPORT(void,png_read_end) PNGARG((png_structp png_ptr, 1819 png_infop info_ptr)); 1820 #endif 1821 1822 /* free any memory associated with the png_info_struct */ 1823 extern PNG_EXPORT(void,png_destroy_info_struct) PNGARG((png_structp png_ptr, 1824 png_infopp info_ptr_ptr)); 1825 1826 /* free any memory associated with the png_struct and the png_info_structs */ 1827 extern PNG_EXPORT(void,png_destroy_read_struct) PNGARG((png_structpp 1828 png_ptr_ptr, png_infopp info_ptr_ptr, png_infopp end_info_ptr_ptr)); 1829 1830 /* free all memory used by the read (old method - NOT DLL EXPORTED) */ 1831 /* Debian note: exporting as it is required by legacy applications */ 1832 extern PNG_EXPORT(void,png_read_destroy) PNGARG((png_structp png_ptr, png_infop info_ptr, 1833 png_infop end_info_ptr)); 1834 1835 /* free any memory associated with the png_struct and the png_info_structs */ 1836 extern PNG_EXPORT(void,png_destroy_write_struct) 1837 PNGARG((png_structpp png_ptr_ptr, png_infopp info_ptr_ptr)); 1838 1839 /* free any memory used in png_ptr struct (old method - NOT DLL EXPORTED) */ 1840 /* Debian note: exporting as it is required by legacy applications */ 1841 extern PNG_EXPORT(void,png_write_destroy) PNGARG((png_structp png_ptr)); 1842 1843 /* set the libpng method of handling chunk CRC errors */ 1844 extern PNG_EXPORT(void,png_set_crc_action) PNGARG((png_structp png_ptr, 1845 int crit_action, int ancil_action)); 1846 1847 /* Values for png_set_crc_action() to say how to handle CRC errors in 1848 * ancillary and critical chunks, and whether to use the data contained 1849 * therein. Note that it is impossible to "discard" data in a critical 1850 * chunk. For versions prior to 0.90, the action was always error/quit, 1851 * whereas in version 0.90 and later, the action for CRC errors in ancillary 1852 * chunks is warn/discard. These values should NOT be changed. 1853 * 1854 * value action:critical action:ancillary 1855 */ 1856 #define PNG_CRC_DEFAULT 0 /* error/quit warn/discard data */ 1857 #define PNG_CRC_ERROR_QUIT 1 /* error/quit error/quit */ 1858 #define PNG_CRC_WARN_DISCARD 2 /* (INVALID) warn/discard data */ 1859 #define PNG_CRC_WARN_USE 3 /* warn/use data warn/use data */ 1860 #define PNG_CRC_QUIET_USE 4 /* quiet/use data quiet/use data */ 1861 #define PNG_CRC_NO_CHANGE 5 /* use current value use current value */ 1862 1863 /* These functions give the user control over the scan-line filtering in 1864 * libpng and the compression methods used by zlib. These functions are 1865 * mainly useful for testing, as the defaults should work with most users. 1866 * Those users who are tight on memory or want faster performance at the 1867 * expense of compression can modify them. See the compression library 1868 * header file (zlib.h) for an explination of the compression functions. 1869 */ 1870 1871 /* set the filtering method(s) used by libpng. Currently, the only valid 1872 * value for "method" is 0. 1873 */ 1874 extern PNG_EXPORT(void,png_set_filter) PNGARG((png_structp png_ptr, int method, 1875 int filters)); 1876 1877 /* Flags for png_set_filter() to say which filters to use. The flags 1878 * are chosen so that they don't conflict with real filter types 1879 * below, in case they are supplied instead of the #defined constants. 1880 * These values should NOT be changed. 1881 */ 1882 #define PNG_NO_FILTERS 0x00 1883 #define PNG_FILTER_NONE 0x08 1884 #define PNG_FILTER_SUB 0x10 1885 #define PNG_FILTER_UP 0x20 1886 #define PNG_FILTER_AVG 0x40 1887 #define PNG_FILTER_PAETH 0x80 1888 #define PNG_ALL_FILTERS (PNG_FILTER_NONE | PNG_FILTER_SUB | PNG_FILTER_UP | \ 1889 PNG_FILTER_AVG | PNG_FILTER_PAETH) 1890 1891 /* Filter values (not flags) - used in pngwrite.c, pngwutil.c for now. 1892 * These defines should NOT be changed. 1893 */ 1894 #define PNG_FILTER_VALUE_NONE 0 1895 #define PNG_FILTER_VALUE_SUB 1 1896 #define PNG_FILTER_VALUE_UP 2 1897 #define PNG_FILTER_VALUE_AVG 3 1898 #define PNG_FILTER_VALUE_PAETH 4 1899 #define PNG_FILTER_VALUE_LAST 5 1900 1901 #if defined(PNG_WRITE_WEIGHTED_FILTER_SUPPORTED) /* EXPERIMENTAL */ 1902 /* The "heuristic_method" is given by one of the PNG_FILTER_HEURISTIC_ 1903 * defines, either the default (minimum-sum-of-absolute-differences), or 1904 * the experimental method (weighted-minimum-sum-of-absolute-differences). 1905 * 1906 * Weights are factors >= 1.0, indicating how important it is to keep the 1907 * filter type consistent between rows. Larger numbers mean the current 1908 * filter is that many times as likely to be the same as the "num_weights" 1909 * previous filters. This is cumulative for each previous row with a weight. 1910 * There needs to be "num_weights" values in "filter_weights", or it can be 1911 * NULL if the weights aren't being specified. Weights have no influence on 1912 * the selection of the first row filter. Well chosen weights can (in theory) 1913 * improve the compression for a given image. 1914 * 1915 * Costs are factors >= 1.0 indicating the relative decoding costs of a 1916 * filter type. Higher costs indicate more decoding expense, and are 1917 * therefore less likely to be selected over a filter with lower computational 1918 * costs. There needs to be a value in "filter_costs" for each valid filter 1919 * type (given by PNG_FILTER_VALUE_LAST), or it can be NULL if you aren't 1920 * setting the costs. Costs try to improve the speed of decompression without 1921 * unduly increasing the compressed image size. 1922 * 1923 * A negative weight or cost indicates the default value is to be used, and 1924 * values in the range [0.0, 1.0) indicate the value is to remain unchanged. 1925 * The default values for both weights and costs are currently 1.0, but may 1926 * change if good general weighting/cost heuristics can be found. If both 1927 * the weights and costs are set to 1.0, this degenerates the WEIGHTED method 1928 * to the UNWEIGHTED method, but with added encoding time/computation. 1929 */ 1930 #ifdef PNG_FLOATING_POINT_SUPPORTED 1931 extern PNG_EXPORT(void,png_set_filter_heuristics) PNGARG((png_structp png_ptr, 1932 int heuristic_method, int num_weights, png_doublep filter_weights, 1933 png_doublep filter_costs)); 1934 #endif 1935 #endif /* PNG_WRITE_WEIGHTED_FILTER_SUPPORTED */ 1936 1937 /* Heuristic used for row filter selection. These defines should NOT be 1938 * changed. 1939 */ 1940 #define PNG_FILTER_HEURISTIC_DEFAULT 0 /* Currently "UNWEIGHTED" */ 1941 #define PNG_FILTER_HEURISTIC_UNWEIGHTED 1 /* Used by libpng < 0.95 */ 1942 #define PNG_FILTER_HEURISTIC_WEIGHTED 2 /* Experimental feature */ 1943 #define PNG_FILTER_HEURISTIC_LAST 3 /* Not a valid value */ 1944 1945 /* Set the library compression level. Currently, valid values range from 1946 * 0 - 9, corresponding directly to the zlib compression levels 0 - 9 1947 * (0 - no compression, 9 - "maximal" compression). Note that tests have 1948 * shown that zlib compression levels 3-6 usually perform as well as level 9 1949 * for PNG images, and do considerably fewer caclulations. In the future, 1950 * these values may not correspond directly to the zlib compression levels. 1951 */ 1952 extern PNG_EXPORT(void,png_set_compression_level) PNGARG((png_structp png_ptr, 1953 int level)); 1954 1955 extern PNG_EXPORT(void,png_set_compression_mem_level) 1956 PNGARG((png_structp png_ptr, int mem_level)); 1957 1958 extern PNG_EXPORT(void,png_set_compression_strategy) 1959 PNGARG((png_structp png_ptr, int strategy)); 1960 1961 extern PNG_EXPORT(void,png_set_compression_window_bits) 1962 PNGARG((png_structp png_ptr, int window_bits)); 1963 1964 extern PNG_EXPORT(void,png_set_compression_method) PNGARG((png_structp png_ptr, 1965 int method)); 1966 1967 /* These next functions are called for input/output, memory, and error 1968 * handling. They are in the file pngrio.c, pngwio.c, and pngerror.c, 1969 * and call standard C I/O routines such as fread(), fwrite(), and 1970 * fprintf(). These functions can be made to use other I/O routines 1971 * at run time for those applications that need to handle I/O in a 1972 * different manner by calling png_set_???_fn(). See libpng.txt for 1973 * more information. 1974 */ 1975 1976 #if !defined(PNG_NO_STDIO) 1977 /* Initialize the input/output for the PNG file to the default functions. */ 1978 extern PNG_EXPORT(void,png_init_io) PNGARG((png_structp png_ptr, png_FILE_p fp)); 1979 #endif 1980 1981 /* Replace the (error and abort), and warning functions with user 1982 * supplied functions. If no messages are to be printed you must still 1983 * write and use replacement functions. The replacement error_fn should 1984 * still do a longjmp to the last setjmp location if you are using this 1985 * method of error handling. If error_fn or warning_fn is NULL, the 1986 * default function will be used. 1987 */ 1988 1989 extern PNG_EXPORT(void,png_set_error_fn) PNGARG((png_structp png_ptr, 1990 png_voidp error_ptr, png_error_ptr error_fn, png_error_ptr warning_fn)); 1991 1992 /* Return the user pointer associated with the error functions */ 1993 extern PNG_EXPORT(png_voidp,png_get_error_ptr) PNGARG((png_structp png_ptr)); 1994 1995 /* Replace the default data output functions with a user supplied one(s). 1996 * If buffered output is not used, then output_flush_fn can be set to NULL. 1997 * If PNG_WRITE_FLUSH_SUPPORTED is not defined at libpng compile time 1998 * output_flush_fn will be ignored (and thus can be NULL). 1999 * It is probably a mistake to use NULL for output_flush_fn if 2000 * write_data_fn is not also NULL unless you have built libpng with 2001 * PNG_WRITE_FLUSH_SUPPORTED undefined, because in this case libpng's 2002 * default flush function, which uses the standard *FILE structure, will 2003 * be used. 2004 */ 2005 extern PNG_EXPORT(void,png_set_write_fn) PNGARG((png_structp png_ptr, 2006 png_voidp io_ptr, png_rw_ptr write_data_fn, png_flush_ptr output_flush_fn)); 2007 2008 /* Replace the default data input function with a user supplied one. */ 2009 extern PNG_EXPORT(void,png_set_read_fn) PNGARG((png_structp png_ptr, 2010 png_voidp io_ptr, png_rw_ptr read_data_fn)); 2011 2012 /* Return the user pointer associated with the I/O functions */ 2013 extern PNG_EXPORT(png_voidp,png_get_io_ptr) PNGARG((png_structp png_ptr)); 2014 2015 extern PNG_EXPORT(void,png_set_read_status_fn) PNGARG((png_structp png_ptr, 2016 png_read_status_ptr read_row_fn)); 2017 2018 extern PNG_EXPORT(void,png_set_write_status_fn) PNGARG((png_structp png_ptr, 2019 png_write_status_ptr write_row_fn)); 2020 2021 #ifdef PNG_USER_MEM_SUPPORTED 2022 /* Replace the default memory allocation functions with user supplied one(s). */ 2023 extern PNG_EXPORT(void,png_set_mem_fn) PNGARG((png_structp png_ptr, 2024 png_voidp mem_ptr, png_malloc_ptr malloc_fn, png_free_ptr free_fn)); 2025 /* Return the user pointer associated with the memory functions */ 2026 extern PNG_EXPORT(png_voidp,png_get_mem_ptr) PNGARG((png_structp png_ptr)); 2027 #endif 2028 2029 #if defined(PNG_READ_USER_TRANSFORM_SUPPORTED) || \ 2030 defined(PNG_LEGACY_SUPPORTED) 2031 extern PNG_EXPORT(void,png_set_read_user_transform_fn) PNGARG((png_structp 2032 png_ptr, png_user_transform_ptr read_user_transform_fn)); 2033 #endif 2034 2035 #if defined(PNG_WRITE_USER_TRANSFORM_SUPPORTED) || \ 2036 defined(PNG_LEGACY_SUPPORTED) 2037 extern PNG_EXPORT(void,png_set_write_user_transform_fn) PNGARG((png_structp 2038 png_ptr, png_user_transform_ptr write_user_transform_fn)); 2039 #endif 2040 2041 #if defined(PNG_READ_USER_TRANSFORM_SUPPORTED) || \ 2042 defined(PNG_WRITE_USER_TRANSFORM_SUPPORTED) || \ 2043 defined(PNG_LEGACY_SUPPORTED) 2044 extern PNG_EXPORT(void,png_set_user_transform_info) PNGARG((png_structp 2045 png_ptr, png_voidp user_transform_ptr, int user_transform_depth, 2046 int user_transform_channels)); 2047 /* Return the user pointer associated with the user transform functions */ 2048 extern PNG_EXPORT(png_voidp,png_get_user_transform_ptr) 2049 PNGARG((png_structp png_ptr)); 2050 #endif 2051 2052 #ifdef PNG_USER_CHUNKS_SUPPORTED 2053 extern PNG_EXPORT(void,png_set_read_user_chunk_fn) PNGARG((png_structp png_ptr, 2054 png_voidp user_chunk_ptr, png_user_chunk_ptr read_user_chunk_fn)); 2055 extern PNG_EXPORT(png_voidp,png_get_user_chunk_ptr) PNGARG((png_structp 2056 png_ptr)); 2057 #endif 2058 2059 #ifdef PNG_PROGRESSIVE_READ_SUPPORTED 2060 /* Sets the function callbacks for the push reader, and a pointer to a 2061 * user-defined structure available to the callback functions. 2062 */ 2063 extern PNG_EXPORT(void,png_set_progressive_read_fn) PNGARG((png_structp png_ptr, 2064 png_voidp progressive_ptr, 2065 png_progressive_info_ptr info_fn, png_progressive_row_ptr row_fn, 2066 png_progressive_end_ptr end_fn)); 2067 2068 /* returns the user pointer associated with the push read functions */ 2069 extern PNG_EXPORT(png_voidp,png_get_progressive_ptr) 2070 PNGARG((png_structp png_ptr)); 2071 2072 /* function to be called when data becomes available */ 2073 extern PNG_EXPORT(void,png_process_data) PNGARG((png_structp png_ptr, 2074 png_infop info_ptr, png_bytep buffer, png_size_t buffer_size)); 2075 2076 /* function that combines rows. Not very much different than the 2077 * png_combine_row() call. Is this even used????? 2078 */ 2079 extern PNG_EXPORT(void,png_progressive_combine_row) PNGARG((png_structp png_ptr, 2080 png_bytep old_row, png_bytep new_row)); 2081 #endif /* PNG_PROGRESSIVE_READ_SUPPORTED */ 2082 2083 extern PNG_EXPORT(png_voidp,png_malloc) PNGARG((png_structp png_ptr, 2084 png_uint_32 size)); 2085 2086 #if defined(PNG_1_0_X) 2087 # define png_malloc_warn png_malloc 2088 #else 2089 /* Added at libpng version 1.2.4 */ 2090 extern PNG_EXPORT(png_voidp,png_malloc_warn) PNGARG((png_structp png_ptr, 2091 png_uint_32 size)); 2092 #endif 2093 2094 /* frees a pointer allocated by png_malloc() */ 2095 extern PNG_EXPORT(void,png_free) PNGARG((png_structp png_ptr, png_voidp ptr)); 2096 2097 #if defined(PNG_1_0_X) 2098 /* Function to allocate memory for zlib. */ 2099 extern PNG_EXPORT(voidpf,png_zalloc) PNGARG((voidpf png_ptr, uInt items, 2100 uInt size)); 2101 2102 /* Function to free memory for zlib */ 2103 extern PNG_EXPORT(void,png_zfree) PNGARG((voidpf png_ptr, voidpf ptr)); 2104 #endif 2105 2106 /* Free data that was allocated internally */ 2107 extern PNG_EXPORT(void,png_free_data) PNGARG((png_structp png_ptr, 2108 png_infop info_ptr, png_uint_32 free_me, int num)); 2109 #ifdef PNG_FREE_ME_SUPPORTED 2110 /* Reassign responsibility for freeing existing data, whether allocated 2111 * by libpng or by the application */ 2112 extern PNG_EXPORT(void,png_data_freer) PNGARG((png_structp png_ptr, 2113 png_infop info_ptr, int freer, png_uint_32 mask)); 2114 #endif 2115 /* assignments for png_data_freer */ 2116 #define PNG_DESTROY_WILL_FREE_DATA 1 2117 #define PNG_SET_WILL_FREE_DATA 1 2118 #define PNG_USER_WILL_FREE_DATA 2 2119 /* Flags for png_ptr->free_me and info_ptr->free_me */ 2120 #define PNG_FREE_HIST 0x0008 2121 #define PNG_FREE_ICCP 0x0010 2122 #define PNG_FREE_SPLT 0x0020 2123 #define PNG_FREE_ROWS 0x0040 2124 #define PNG_FREE_PCAL 0x0080 2125 #define PNG_FREE_SCAL 0x0100 2126 #define PNG_FREE_UNKN 0x0200 2127 #define PNG_FREE_LIST 0x0400 2128 #define PNG_FREE_PLTE 0x1000 2129 #define PNG_FREE_TRNS 0x2000 2130 #define PNG_FREE_TEXT 0x4000 2131 #define PNG_FREE_ALL 0x7fff 2132 #define PNG_FREE_MUL 0x4220 /* PNG_FREE_SPLT|PNG_FREE_TEXT|PNG_FREE_UNKN */ 2133 2134 #ifdef PNG_USER_MEM_SUPPORTED 2135 extern PNG_EXPORT(png_voidp,png_malloc_default) PNGARG((png_structp png_ptr, 2136 png_uint_32 size)); 2137 extern PNG_EXPORT(void,png_free_default) PNGARG((png_structp png_ptr, 2138 png_voidp ptr)); 2139 #endif 2140 2141 extern PNG_EXPORT(png_voidp,png_memcpy_check) PNGARG((png_structp png_ptr, 2142 png_voidp s1, png_voidp s2, png_uint_32 size)); 2143 2144 extern PNG_EXPORT(png_voidp,png_memset_check) PNGARG((png_structp png_ptr, 2145 png_voidp s1, int value, png_uint_32 size)); 2146 2147 #if defined(USE_FAR_KEYWORD) /* memory model conversion function */ 2148 extern void *png_far_to_near PNGARG((png_structp png_ptr,png_voidp ptr, 2149 int check)); 2150 #endif /* USE_FAR_KEYWORD */ 2151 2152 #ifndef PNG_NO_ERROR_TEXT 2153 /* Fatal error in PNG image of libpng - can't continue */ 2154 extern PNG_EXPORT(void,png_error) PNGARG((png_structp png_ptr, 2155 png_const_charp error_message)); 2156 2157 /* The same, but the chunk name is prepended to the error string. */ 2158 extern PNG_EXPORT(void,png_chunk_error) PNGARG((png_structp png_ptr, 2159 png_const_charp error_message)); 2160 #else 2161 /* Fatal error in PNG image of libpng - can't continue */ 2162 extern PNG_EXPORT(void,png_err) PNGARG((png_structp png_ptr)); 2163 #endif 2164 2165 #ifndef PNG_NO_WARNINGS 2166 /* Non-fatal error in libpng. Can continue, but may have a problem. */ 2167 extern PNG_EXPORT(void,png_warning) PNGARG((png_structp png_ptr, 2168 png_const_charp warning_message)); 2169 2170 #ifdef PNG_READ_SUPPORTED 2171 /* Non-fatal error in libpng, chunk name is prepended to message. */ 2172 extern PNG_EXPORT(void,png_chunk_warning) PNGARG((png_structp png_ptr, 2173 png_const_charp warning_message)); 2174 #endif /* PNG_READ_SUPPORTED */ 2175 #endif /* PNG_NO_WARNINGS */ 2176 2177 /* The png_set_<chunk> functions are for storing values in the png_info_struct. 2178 * Similarly, the png_get_<chunk> calls are used to read values from the 2179 * png_info_struct, either storing the parameters in the passed variables, or 2180 * setting pointers into the png_info_struct where the data is stored. The 2181 * png_get_<chunk> functions return a non-zero value if the data was available 2182 * in info_ptr, or return zero and do not change any of the parameters if the 2183 * data was not available. 2184 * 2185 * These functions should be used instead of directly accessing png_info 2186 * to avoid problems with future changes in the size and internal layout of 2187 * png_info_struct. 2188 */ 2189 /* Returns "flag" if chunk data is valid in info_ptr. */ 2190 extern PNG_EXPORT(png_uint_32,png_get_valid) PNGARG((png_structp png_ptr, 2191 png_infop info_ptr, png_uint_32 flag)); 2192 2193 /* Returns number of bytes needed to hold a transformed row. */ 2194 extern PNG_EXPORT(png_uint_32,png_get_rowbytes) PNGARG((png_structp png_ptr, 2195 png_infop info_ptr)); 2196 2197 #if defined(PNG_INFO_IMAGE_SUPPORTED) 2198 /* Returns row_pointers, which is an array of pointers to scanlines that was 2199 returned from png_read_png(). */ 2200 extern PNG_EXPORT(png_bytepp,png_get_rows) PNGARG((png_structp png_ptr, 2201 png_infop info_ptr)); 2202 /* Set row_pointers, which is an array of pointers to scanlines for use 2203 by png_write_png(). */ 2204 extern PNG_EXPORT(void,png_set_rows) PNGARG((png_structp png_ptr, 2205 png_infop info_ptr, png_bytepp row_pointers)); 2206 #endif 2207 2208 /* Returns number of color channels in image. */ 2209 extern PNG_EXPORT(png_byte,png_get_channels) PNGARG((png_structp png_ptr, 2210 png_infop info_ptr)); 2211 2212 #ifdef PNG_EASY_ACCESS_SUPPORTED 2213 /* Returns image width in pixels. */ 2214 extern PNG_EXPORT(png_uint_32, png_get_image_width) PNGARG((png_structp 2215 png_ptr, png_infop info_ptr)); 2216 2217 /* Returns image height in pixels. */ 2218 extern PNG_EXPORT(png_uint_32, png_get_image_height) PNGARG((png_structp 2219 png_ptr, png_infop info_ptr)); 2220 2221 /* Returns image bit_depth. */ 2222 extern PNG_EXPORT(png_byte, png_get_bit_depth) PNGARG((png_structp 2223 png_ptr, png_infop info_ptr)); 2224 2225 /* Returns image color_type. */ 2226 extern PNG_EXPORT(png_byte, png_get_color_type) PNGARG((png_structp 2227 png_ptr, png_infop info_ptr)); 2228 2229 /* Returns image filter_type. */ 2230 extern PNG_EXPORT(png_byte, png_get_filter_type) PNGARG((png_structp 2231 png_ptr, png_infop info_ptr)); 2232 2233 /* Returns image interlace_type. */ 2234 extern PNG_EXPORT(png_byte, png_get_interlace_type) PNGARG((png_structp 2235 png_ptr, png_infop info_ptr)); 2236 2237 /* Returns image compression_type. */ 2238 extern PNG_EXPORT(png_byte, png_get_compression_type) PNGARG((png_structp 2239 png_ptr, png_infop info_ptr)); 2240 2241 /* Returns image resolution in pixels per meter, from pHYs chunk data. */ 2242 extern PNG_EXPORT(png_uint_32, png_get_pixels_per_meter) PNGARG((png_structp 2243 png_ptr, png_infop info_ptr)); 2244 extern PNG_EXPORT(png_uint_32, png_get_x_pixels_per_meter) PNGARG((png_structp 2245 png_ptr, png_infop info_ptr)); 2246 extern PNG_EXPORT(png_uint_32, png_get_y_pixels_per_meter) PNGARG((png_structp 2247 png_ptr, png_infop info_ptr)); 2248 2249 /* Returns pixel aspect ratio, computed from pHYs chunk data. */ 2250 #ifdef PNG_FLOATING_POINT_SUPPORTED 2251 extern PNG_EXPORT(float, png_get_pixel_aspect_ratio) PNGARG((png_structp 2252 png_ptr, png_infop info_ptr)); 2253 #endif 2254 2255 /* Returns image x, y offset in pixels or microns, from oFFs chunk data. */ 2256 extern PNG_EXPORT(png_int_32, png_get_x_offset_pixels) PNGARG((png_structp 2257 png_ptr, png_infop info_ptr)); 2258 extern PNG_EXPORT(png_int_32, png_get_y_offset_pixels) PNGARG((png_structp 2259 png_ptr, png_infop info_ptr)); 2260 extern PNG_EXPORT(png_int_32, png_get_x_offset_microns) PNGARG((png_structp 2261 png_ptr, png_infop info_ptr)); 2262 extern PNG_EXPORT(png_int_32, png_get_y_offset_microns) PNGARG((png_structp 2263 png_ptr, png_infop info_ptr)); 2264 2265 #endif /* PNG_EASY_ACCESS_SUPPORTED */ 2266 2267 /* Returns pointer to signature string read from PNG header */ 2268 extern PNG_EXPORT(png_bytep,png_get_signature) PNGARG((png_structp png_ptr, 2269 png_infop info_ptr)); 2270 2271 #if defined(PNG_bKGD_SUPPORTED) 2272 extern PNG_EXPORT(png_uint_32,png_get_bKGD) PNGARG((png_structp png_ptr, 2273 png_infop info_ptr, png_color_16p *background)); 2274 #endif 2275 2276 #if defined(PNG_bKGD_SUPPORTED) 2277 extern PNG_EXPORT(void,png_set_bKGD) PNGARG((png_structp png_ptr, 2278 png_infop info_ptr, png_color_16p background)); 2279 #endif 2280 2281 #if defined(PNG_cHRM_SUPPORTED) 2282 #ifdef PNG_FLOATING_POINT_SUPPORTED 2283 extern PNG_EXPORT(png_uint_32,png_get_cHRM) PNGARG((png_structp png_ptr, 2284 png_infop info_ptr, double *white_x, double *white_y, double *red_x, 2285 double *red_y, double *green_x, double *green_y, double *blue_x, 2286 double *blue_y)); 2287 #endif 2288 #ifdef PNG_FIXED_POINT_SUPPORTED 2289 extern PNG_EXPORT(png_uint_32,png_get_cHRM_fixed) PNGARG((png_structp png_ptr, 2290 png_infop info_ptr, png_fixed_point *int_white_x, png_fixed_point 2291 *int_white_y, png_fixed_point *int_red_x, png_fixed_point *int_red_y, 2292 png_fixed_point *int_green_x, png_fixed_point *int_green_y, png_fixed_point 2293 *int_blue_x, png_fixed_point *int_blue_y)); 2294 #endif 2295 #endif 2296 2297 #if defined(PNG_cHRM_SUPPORTED) 2298 #ifdef PNG_FLOATING_POINT_SUPPORTED 2299 extern PNG_EXPORT(void,png_set_cHRM) PNGARG((png_structp png_ptr, 2300 png_infop info_ptr, double white_x, double white_y, double red_x, 2301 double red_y, double green_x, double green_y, double blue_x, double blue_y)); 2302 #endif 2303 #ifdef PNG_FIXED_POINT_SUPPORTED 2304 extern PNG_EXPORT(void,png_set_cHRM_fixed) PNGARG((png_structp png_ptr, 2305 png_infop info_ptr, png_fixed_point int_white_x, png_fixed_point int_white_y, 2306 png_fixed_point int_red_x, png_fixed_point int_red_y, png_fixed_point 2307 int_green_x, png_fixed_point int_green_y, png_fixed_point int_blue_x, 2308 png_fixed_point int_blue_y)); 2309 #endif 2310 #endif 2311 2312 #if defined(PNG_gAMA_SUPPORTED) 2313 #ifdef PNG_FLOATING_POINT_SUPPORTED 2314 extern PNG_EXPORT(png_uint_32,png_get_gAMA) PNGARG((png_structp png_ptr, 2315 png_infop info_ptr, double *file_gamma)); 2316 #endif 2317 extern PNG_EXPORT(png_uint_32,png_get_gAMA_fixed) PNGARG((png_structp png_ptr, 2318 png_infop info_ptr, png_fixed_point *int_file_gamma)); 2319 #endif 2320 2321 #if defined(PNG_gAMA_SUPPORTED) 2322 #ifdef PNG_FLOATING_POINT_SUPPORTED 2323 extern PNG_EXPORT(void,png_set_gAMA) PNGARG((png_structp png_ptr, 2324 png_infop info_ptr, double file_gamma)); 2325 #endif 2326 extern PNG_EXPORT(void,png_set_gAMA_fixed) PNGARG((png_structp png_ptr, 2327 png_infop info_ptr, png_fixed_point int_file_gamma)); 2328 #endif 2329 2330 #if defined(PNG_hIST_SUPPORTED) 2331 extern PNG_EXPORT(png_uint_32,png_get_hIST) PNGARG((png_structp png_ptr, 2332 png_infop info_ptr, png_uint_16p *hist)); 2333 #endif 2334 2335 #if defined(PNG_hIST_SUPPORTED) 2336 extern PNG_EXPORT(void,png_set_hIST) PNGARG((png_structp png_ptr, 2337 png_infop info_ptr, png_uint_16p hist)); 2338 #endif 2339 2340 extern PNG_EXPORT(png_uint_32,png_get_IHDR) PNGARG((png_structp png_ptr, 2341 png_infop info_ptr, png_uint_32 *width, png_uint_32 *height, 2342 int *bit_depth, int *color_type, int *interlace_method, 2343 int *compression_method, int *filter_method)); 2344 2345 extern PNG_EXPORT(void,png_set_IHDR) PNGARG((png_structp png_ptr, 2346 png_infop info_ptr, png_uint_32 width, png_uint_32 height, int bit_depth, 2347 int color_type, int interlace_method, int compression_method, 2348 int filter_method)); 2349 2350 #if defined(PNG_oFFs_SUPPORTED) 2351 extern PNG_EXPORT(png_uint_32,png_get_oFFs) PNGARG((png_structp png_ptr, 2352 png_infop info_ptr, png_int_32 *offset_x, png_int_32 *offset_y, 2353 int *unit_type)); 2354 #endif 2355 2356 #if defined(PNG_oFFs_SUPPORTED) 2357 extern PNG_EXPORT(void,png_set_oFFs) PNGARG((png_structp png_ptr, 2358 png_infop info_ptr, png_int_32 offset_x, png_int_32 offset_y, 2359 int unit_type)); 2360 #endif 2361 2362 #if defined(PNG_pCAL_SUPPORTED) 2363 extern PNG_EXPORT(png_uint_32,png_get_pCAL) PNGARG((png_structp png_ptr, 2364 png_infop info_ptr, png_charp *purpose, png_int_32 *X0, png_int_32 *X1, 2365 int *type, int *nparams, png_charp *units, png_charpp *params)); 2366 #endif 2367 2368 #if defined(PNG_pCAL_SUPPORTED) 2369 extern PNG_EXPORT(void,png_set_pCAL) PNGARG((png_structp png_ptr, 2370 png_infop info_ptr, png_charp purpose, png_int_32 X0, png_int_32 X1, 2371 int type, int nparams, png_charp units, png_charpp params)); 2372 #endif 2373 2374 #if defined(PNG_pHYs_SUPPORTED) 2375 extern PNG_EXPORT(png_uint_32,png_get_pHYs) PNGARG((png_structp png_ptr, 2376 png_infop info_ptr, png_uint_32 *res_x, png_uint_32 *res_y, int *unit_type)); 2377 #endif 2378 2379 #if defined(PNG_pHYs_SUPPORTED) 2380 extern PNG_EXPORT(void,png_set_pHYs) PNGARG((png_structp png_ptr, 2381 png_infop info_ptr, png_uint_32 res_x, png_uint_32 res_y, int unit_type)); 2382 #endif 2383 2384 extern PNG_EXPORT(png_uint_32,png_get_PLTE) PNGARG((png_structp png_ptr, 2385 png_infop info_ptr, png_colorp *palette, int *num_palette)); 2386 2387 extern PNG_EXPORT(void,png_set_PLTE) PNGARG((png_structp png_ptr, 2388 png_infop info_ptr, png_colorp palette, int num_palette)); 2389 2390 #if defined(PNG_sBIT_SUPPORTED) 2391 extern PNG_EXPORT(png_uint_32,png_get_sBIT) PNGARG((png_structp png_ptr, 2392 png_infop info_ptr, png_color_8p *sig_bit)); 2393 #endif 2394 2395 #if defined(PNG_sBIT_SUPPORTED) 2396 extern PNG_EXPORT(void,png_set_sBIT) PNGARG((png_structp png_ptr, 2397 png_infop info_ptr, png_color_8p sig_bit)); 2398 #endif 2399 2400 #if defined(PNG_sRGB_SUPPORTED) 2401 extern PNG_EXPORT(png_uint_32,png_get_sRGB) PNGARG((png_structp png_ptr, 2402 png_infop info_ptr, int *intent)); 2403 #endif 2404 2405 #if defined(PNG_sRGB_SUPPORTED) 2406 extern PNG_EXPORT(void,png_set_sRGB) PNGARG((png_structp png_ptr, 2407 png_infop info_ptr, int intent)); 2408 extern PNG_EXPORT(void,png_set_sRGB_gAMA_and_cHRM) PNGARG((png_structp png_ptr, 2409 png_infop info_ptr, int intent)); 2410 #endif 2411 2412 #if defined(PNG_iCCP_SUPPORTED) 2413 extern PNG_EXPORT(png_uint_32,png_get_iCCP) PNGARG((png_structp png_ptr, 2414 png_infop info_ptr, png_charpp name, int *compression_type, 2415 png_charpp profile, png_uint_32 *proflen)); 2416 /* Note to maintainer: profile should be png_bytepp */ 2417 #endif 2418 2419 #if defined(PNG_iCCP_SUPPORTED) 2420 extern PNG_EXPORT(void,png_set_iCCP) PNGARG((png_structp png_ptr, 2421 png_infop info_ptr, png_charp name, int compression_type, 2422 png_charp profile, png_uint_32 proflen)); 2423 /* Note to maintainer: profile should be png_bytep */ 2424 #endif 2425 2426 #if defined(PNG_sPLT_SUPPORTED) 2427 extern PNG_EXPORT(png_uint_32,png_get_sPLT) PNGARG((png_structp png_ptr, 2428 png_infop info_ptr, png_sPLT_tpp entries)); 2429 #endif 2430 2431 #if defined(PNG_sPLT_SUPPORTED) 2432 extern PNG_EXPORT(void,png_set_sPLT) PNGARG((png_structp png_ptr, 2433 png_infop info_ptr, png_sPLT_tp entries, int nentries)); 2434 #endif 2435 2436 #if defined(PNG_TEXT_SUPPORTED) 2437 /* png_get_text also returns the number of text chunks in *num_text */ 2438 extern PNG_EXPORT(png_uint_32,png_get_text) PNGARG((png_structp png_ptr, 2439 png_infop info_ptr, png_textp *text_ptr, int *num_text)); 2440 #endif 2441 2442 /* 2443 * Note while png_set_text() will accept a structure whose text, 2444 * language, and translated keywords are NULL pointers, the structure 2445 * returned by png_get_text will always contain regular 2446 * zero-terminated C strings. They might be empty strings but 2447 * they will never be NULL pointers. 2448 */ 2449 2450 #if defined(PNG_TEXT_SUPPORTED) 2451 extern PNG_EXPORT(void,png_set_text) PNGARG((png_structp png_ptr, 2452 png_infop info_ptr, png_textp text_ptr, int num_text)); 2453 #endif 2454 2455 #if defined(PNG_tIME_SUPPORTED) 2456 extern PNG_EXPORT(png_uint_32,png_get_tIME) PNGARG((png_structp png_ptr, 2457 png_infop info_ptr, png_timep *mod_time)); 2458 #endif 2459 2460 #if defined(PNG_tIME_SUPPORTED) 2461 extern PNG_EXPORT(void,png_set_tIME) PNGARG((png_structp png_ptr, 2462 png_infop info_ptr, png_timep mod_time)); 2463 #endif 2464 2465 #if defined(PNG_tRNS_SUPPORTED) 2466 extern PNG_EXPORT(png_uint_32,png_get_tRNS) PNGARG((png_structp png_ptr, 2467 png_infop info_ptr, png_bytep *trans, int *num_trans, 2468 png_color_16p *trans_values)); 2469 #endif 2470 2471 #if defined(PNG_tRNS_SUPPORTED) 2472 extern PNG_EXPORT(void,png_set_tRNS) PNGARG((png_structp png_ptr, 2473 png_infop info_ptr, png_bytep trans, int num_trans, 2474 png_color_16p trans_values)); 2475 #endif 2476 2477 #if defined(PNG_tRNS_SUPPORTED) 2478 #endif 2479 2480 #if defined(PNG_sCAL_SUPPORTED) 2481 #ifdef PNG_FLOATING_POINT_SUPPORTED 2482 extern PNG_EXPORT(png_uint_32,png_get_sCAL) PNGARG((png_structp png_ptr, 2483 png_infop info_ptr, int *unit, double *width, double *height)); 2484 #else 2485 #ifdef PNG_FIXED_POINT_SUPPORTED 2486 extern PNG_EXPORT(png_uint_32,png_get_sCAL_s) PNGARG((png_structp png_ptr, 2487 png_infop info_ptr, int *unit, png_charpp swidth, png_charpp sheight)); 2488 #endif 2489 #endif 2490 #endif /* PNG_sCAL_SUPPORTED */ 2491 2492 #if defined(PNG_sCAL_SUPPORTED) 2493 #ifdef PNG_FLOATING_POINT_SUPPORTED 2494 extern PNG_EXPORT(void,png_set_sCAL) PNGARG((png_structp png_ptr, 2495 png_infop info_ptr, int unit, double width, double height)); 2496 #else 2497 #ifdef PNG_FIXED_POINT_SUPPORTED 2498 extern PNG_EXPORT(void,png_set_sCAL_s) PNGARG((png_structp png_ptr, 2499 png_infop info_ptr, int unit, png_charp swidth, png_charp sheight)); 2500 #endif 2501 #endif 2502 #endif /* PNG_sCAL_SUPPORTED || PNG_WRITE_sCAL_SUPPORTED */ 2503 2504 #if defined(PNG_UNKNOWN_CHUNKS_SUPPORTED) 2505 /* provide a list of chunks and how they are to be handled, if the built-in 2506 handling or default unknown chunk handling is not desired. Any chunks not 2507 listed will be handled in the default manner. The IHDR and IEND chunks 2508 must not be listed. 2509 keep = 0: follow default behaviour 2510 = 1: do not keep 2511 = 2: keep only if safe-to-copy 2512 = 3: keep even if unsafe-to-copy 2513 */ 2514 extern PNG_EXPORT(void, png_set_keep_unknown_chunks) PNGARG((png_structp 2515 png_ptr, int keep, png_bytep chunk_list, int num_chunks)); 2516 extern PNG_EXPORT(void, png_set_unknown_chunks) PNGARG((png_structp png_ptr, 2517 png_infop info_ptr, png_unknown_chunkp unknowns, int num_unknowns)); 2518 extern PNG_EXPORT(void, png_set_unknown_chunk_location) 2519 PNGARG((png_structp png_ptr, png_infop info_ptr, int chunk, int location)); 2520 extern PNG_EXPORT(png_uint_32,png_get_unknown_chunks) PNGARG((png_structp 2521 png_ptr, png_infop info_ptr, png_unknown_chunkpp entries)); 2522 #endif 2523 #ifdef PNG_HANDLE_AS_UNKNOWN_SUPPORTED 2524 PNG_EXPORT(int,png_handle_as_unknown) PNGARG((png_structp png_ptr, png_bytep 2525 chunk_name)); 2526 #endif 2527 2528 /* Png_free_data() will turn off the "valid" flag for anything it frees. 2529 If you need to turn it off for a chunk that your application has freed, 2530 you can use png_set_invalid(png_ptr, info_ptr, PNG_INFO_CHNK); */ 2531 extern PNG_EXPORT(void, png_set_invalid) PNGARG((png_structp png_ptr, 2532 png_infop info_ptr, int mask)); 2533 2534 #if defined(PNG_INFO_IMAGE_SUPPORTED) 2535 /* The "params" pointer is currently not used and is for future expansion. */ 2536 extern PNG_EXPORT(void, png_read_png) PNGARG((png_structp png_ptr, 2537 png_infop info_ptr, 2538 int transforms, 2539 png_voidp params)); 2540 extern PNG_EXPORT(void, png_write_png) PNGARG((png_structp png_ptr, 2541 png_infop info_ptr, 2542 int transforms, 2543 png_voidp params)); 2544 #endif 2545 2546 /* Define PNG_DEBUG at compile time for debugging information. Higher 2547 * numbers for PNG_DEBUG mean more debugging information. This has 2548 * only been added since version 0.95 so it is not implemented throughout 2549 * libpng yet, but more support will be added as needed. 2550 */ 2551 #ifdef PNG_DEBUG 2552 #if (PNG_DEBUG > 0) 2553 #if !defined(PNG_DEBUG_FILE) && defined(_MSC_VER) 2554 #include <crtdbg.h> 2555 #if (PNG_DEBUG > 1) 2556 #ifndef _DEBUG 2557 # define _DEBUG 2558 #endif 2559 #ifndef png_debug 2560 #define png_debug(l,m) _RPT0(_CRT_WARN,m PNG_STRING_NEWLINE) 2561 #endif 2562 #ifndef png_debug1 2563 #define png_debug1(l,m,p1) _RPT1(_CRT_WARN,m PNG_STRING_NEWLINE,p1) 2564 #endif 2565 #ifndef png_debug2 2566 #define png_debug2(l,m,p1,p2) _RPT2(_CRT_WARN,m PNG_STRING_NEWLINE,p1,p2) 2567 #endif 2568 #endif 2569 #else /* PNG_DEBUG_FILE || !_MSC_VER */ 2570 #ifndef PNG_DEBUG_FILE 2571 #define PNG_DEBUG_FILE stderr 2572 #endif /* PNG_DEBUG_FILE */ 2573 2574 #if (PNG_DEBUG > 1) 2575 /* Note: ["%s"m PNG_STRING_NEWLINE] probably does not work on 2576 * non-ISO compilers */ 2577 # ifdef __STDC__ 2578 # ifndef png_debug 2579 # define png_debug(l,m) \ 2580 { \ 2581 int num_tabs=l; \ 2582 fprintf(PNG_DEBUG_FILE,"%s"m PNG_STRING_NEWLINE,(num_tabs==1 ? "\t" : \ 2583 (num_tabs==2 ? "\t\t":(num_tabs>2 ? "\t\t\t":"")))); \ 2584 } 2585 # endif 2586 # ifndef png_debug1 2587 # define png_debug1(l,m,p1) \ 2588 { \ 2589 int num_tabs=l; \ 2590 fprintf(PNG_DEBUG_FILE,"%s"m PNG_STRING_NEWLINE,(num_tabs==1 ? "\t" : \ 2591 (num_tabs==2 ? "\t\t":(num_tabs>2 ? "\t\t\t":""))),p1); \ 2592 } 2593 # endif 2594 # ifndef png_debug2 2595 # define png_debug2(l,m,p1,p2) \ 2596 { \ 2597 int num_tabs=l; \ 2598 fprintf(PNG_DEBUG_FILE,"%s"m PNG_STRING_NEWLINE,(num_tabs==1 ? "\t" : \ 2599 (num_tabs==2 ? "\t\t":(num_tabs>2 ? "\t\t\t":""))),p1,p2); \ 2600 } 2601 # endif 2602 # else /* __STDC __ */ 2603 # ifndef png_debug 2604 # define png_debug(l,m) \ 2605 { \ 2606 int num_tabs=l; \ 2607 char format[256]; \ 2608 snprintf(format,256,"%s%s%s",(num_tabs==1 ? "\t" : \ 2609 (num_tabs==2 ? "\t\t":(num_tabs>2 ? "\t\t\t":""))), \ 2610 m,PNG_STRING_NEWLINE); \ 2611 fprintf(PNG_DEBUG_FILE,format); \ 2612 } 2613 # endif 2614 # ifndef png_debug1 2615 # define png_debug1(l,m,p1) \ 2616 { \ 2617 int num_tabs=l; \ 2618 char format[256]; \ 2619 snprintf(format,256,"%s%s%s",(num_tabs==1 ? "\t" : \ 2620 (num_tabs==2 ? "\t\t":(num_tabs>2 ? "\t\t\t":""))), \ 2621 m,PNG_STRING_NEWLINE); \ 2622 fprintf(PNG_DEBUG_FILE,format,p1); \ 2623 } 2624 # endif 2625 # ifndef png_debug2 2626 # define png_debug2(l,m,p1,p2) \ 2627 { \ 2628 int num_tabs=l; \ 2629 char format[256]; \ 2630 snprintf(format,256,"%s%s%s",(num_tabs==1 ? "\t" : \ 2631 (num_tabs==2 ? "\t\t":(num_tabs>2 ? "\t\t\t":""))), \ 2632 m,PNG_STRING_NEWLINE); \ 2633 fprintf(PNG_DEBUG_FILE,format,p1,p2); \ 2634 } 2635 # endif 2636 # endif /* __STDC __ */ 2637 #endif /* (PNG_DEBUG > 1) */ 2638 2639 #endif /* _MSC_VER */ 2640 #endif /* (PNG_DEBUG > 0) */ 2641 #endif /* PNG_DEBUG */ 2642 #ifndef png_debug 2643 #define png_debug(l, m) 2644 #endif 2645 #ifndef png_debug1 2646 #define png_debug1(l, m, p1) 2647 #endif 2648 #ifndef png_debug2 2649 #define png_debug2(l, m, p1, p2) 2650 #endif 2651 2652 extern PNG_EXPORT(png_charp,png_get_copyright) PNGARG((png_structp png_ptr)); 2653 extern PNG_EXPORT(png_charp,png_get_header_ver) PNGARG((png_structp png_ptr)); 2654 extern PNG_EXPORT(png_charp,png_get_header_version) PNGARG((png_structp png_ptr)); 2655 extern PNG_EXPORT(png_charp,png_get_libpng_ver) PNGARG((png_structp png_ptr)); 2656 2657 #ifdef PNG_MNG_FEATURES_SUPPORTED 2658 extern PNG_EXPORT(png_uint_32,png_permit_mng_features) PNGARG((png_structp 2659 png_ptr, png_uint_32 mng_features_permitted)); 2660 #endif 2661 2662 /* For use in png_set_keep_unknown, added to version 1.2.6 */ 2663 #define PNG_HANDLE_CHUNK_AS_DEFAULT 0 2664 #define PNG_HANDLE_CHUNK_NEVER 1 2665 #define PNG_HANDLE_CHUNK_IF_SAFE 2 2666 #define PNG_HANDLE_CHUNK_ALWAYS 3 2667 2668 /* Added to version 1.2.0 */ 2669 #if defined(PNG_ASSEMBLER_CODE_SUPPORTED) 2670 #if defined(PNG_MMX_CODE_SUPPORTED) 2671 #define PNG_ASM_FLAG_MMX_SUPPORT_COMPILED 0x01 /* not user-settable */ 2672 #define PNG_ASM_FLAG_MMX_SUPPORT_IN_CPU 0x02 /* not user-settable */ 2673 #define PNG_ASM_FLAG_MMX_READ_COMBINE_ROW 0x04 2674 #define PNG_ASM_FLAG_MMX_READ_INTERLACE 0x08 2675 #define PNG_ASM_FLAG_MMX_READ_FILTER_SUB 0x10 2676 #define PNG_ASM_FLAG_MMX_READ_FILTER_UP 0x20 2677 #define PNG_ASM_FLAG_MMX_READ_FILTER_AVG 0x40 2678 #define PNG_ASM_FLAG_MMX_READ_FILTER_PAETH 0x80 2679 #define PNG_ASM_FLAGS_INITIALIZED 0x80000000 /* not user-settable */ 2680 2681 #define PNG_MMX_READ_FLAGS ( PNG_ASM_FLAG_MMX_READ_COMBINE_ROW \ 2682 | PNG_ASM_FLAG_MMX_READ_INTERLACE \ 2683 | PNG_ASM_FLAG_MMX_READ_FILTER_SUB \ 2684 | PNG_ASM_FLAG_MMX_READ_FILTER_UP \ 2685 | PNG_ASM_FLAG_MMX_READ_FILTER_AVG \ 2686 | PNG_ASM_FLAG_MMX_READ_FILTER_PAETH ) 2687 #define PNG_MMX_WRITE_FLAGS ( 0 ) 2688 2689 #define PNG_MMX_FLAGS ( PNG_ASM_FLAG_MMX_SUPPORT_COMPILED \ 2690 | PNG_ASM_FLAG_MMX_SUPPORT_IN_CPU \ 2691 | PNG_MMX_READ_FLAGS \ 2692 | PNG_MMX_WRITE_FLAGS ) 2693 2694 #define PNG_SELECT_READ 1 2695 #define PNG_SELECT_WRITE 2 2696 #endif /* PNG_MMX_CODE_SUPPORTED */ 2697 2698 #if !defined(PNG_1_0_X) 2699 /* pngget.c */ 2700 extern PNG_EXPORT(png_uint_32,png_get_mmx_flagmask) 2701 PNGARG((int flag_select, int *compilerID)); 2702 2703 /* pngget.c */ 2704 extern PNG_EXPORT(png_uint_32,png_get_asm_flagmask) 2705 PNGARG((int flag_select)); 2706 2707 /* pngget.c */ 2708 extern PNG_EXPORT(png_uint_32,png_get_asm_flags) 2709 PNGARG((png_structp png_ptr)); 2710 2711 /* pngget.c */ 2712 extern PNG_EXPORT(png_byte,png_get_mmx_bitdepth_threshold) 2713 PNGARG((png_structp png_ptr)); 2714 2715 /* pngget.c */ 2716 extern PNG_EXPORT(png_uint_32,png_get_mmx_rowbytes_threshold) 2717 PNGARG((png_structp png_ptr)); 2718 2719 /* pngset.c */ 2720 extern PNG_EXPORT(void,png_set_asm_flags) 2721 PNGARG((png_structp png_ptr, png_uint_32 asm_flags)); 2722 2723 /* pngset.c */ 2724 extern PNG_EXPORT(void,png_set_mmx_thresholds) 2725 PNGARG((png_structp png_ptr, png_byte mmx_bitdepth_threshold, 2726 png_uint_32 mmx_rowbytes_threshold)); 2727 2728 #endif /* PNG_1_0_X */ 2729 2730 #if !defined(PNG_1_0_X) 2731 /* png.c, pnggccrd.c, or pngvcrd.c */ 2732 extern PNG_EXPORT(int,png_mmx_support) PNGARG((void)); 2733 #endif /* PNG_1_0_X */ 2734 #endif /* PNG_ASSEMBLER_CODE_SUPPORTED */ 2735 2736 /* Strip the prepended error numbers ("#nnn ") from error and warning 2737 * messages before passing them to the error or warning handler. */ 2738 #ifdef PNG_ERROR_NUMBERS_SUPPORTED 2739 extern PNG_EXPORT(void,png_set_strip_error_numbers) PNGARG((png_structp 2740 png_ptr, png_uint_32 strip_mode)); 2741 #endif 2742 2743 /* Added at libpng-1.2.6 */ 2744 #ifdef PNG_SET_USER_LIMITS_SUPPORTED 2745 extern PNG_EXPORT(void,png_set_user_limits) PNGARG((png_structp 2746 png_ptr, png_uint_32 user_width_max, png_uint_32 user_height_max)); 2747 extern PNG_EXPORT(png_uint_32,png_get_user_width_max) PNGARG((png_structp 2748 png_ptr)); 2749 extern PNG_EXPORT(png_uint_32,png_get_user_height_max) PNGARG((png_structp 2750 png_ptr)); 2751 #endif 2752 2753 2754 /* Maintainer: Put new public prototypes here ^, in libpng.3, and project defs */ 2755 2756 #ifdef PNG_READ_COMPOSITE_NODIV_SUPPORTED 2757 /* With these routines we avoid an integer divide, which will be slower on 2758 * most machines. However, it does take more operations than the corresponding 2759 * divide method, so it may be slower on a few RISC systems. There are two 2760 * shifts (by 8 or 16 bits) and an addition, versus a single integer divide. 2761 * 2762 * Note that the rounding factors are NOT supposed to be the same! 128 and 2763 * 32768 are correct for the NODIV code; 127 and 32767 are correct for the 2764 * standard method. 2765 * 2766 * [Optimized code by Greg Roelofs and Mark Adler...blame us for bugs. :-) ] 2767 */ 2768 2769 /* fg and bg should be in `gamma 1.0' space; alpha is the opacity */ 2770 2771 # define png_composite(composite, fg, alpha, bg) \ 2772 { png_uint_16 temp = (png_uint_16)((png_uint_16)(fg) * (png_uint_16)(alpha) \ 2773 + (png_uint_16)(bg)*(png_uint_16)(255 - \ 2774 (png_uint_16)(alpha)) + (png_uint_16)128); \ 2775 (composite) = (png_byte)((temp + (temp >> 8)) >> 8); } 2776 2777 # define png_composite_16(composite, fg, alpha, bg) \ 2778 { png_uint_32 temp = (png_uint_32)((png_uint_32)(fg) * (png_uint_32)(alpha) \ 2779 + (png_uint_32)(bg)*(png_uint_32)(65535L - \ 2780 (png_uint_32)(alpha)) + (png_uint_32)32768L); \ 2781 (composite) = (png_uint_16)((temp + (temp >> 16)) >> 16); } 2782 2783 #else /* standard method using integer division */ 2784 2785 # define png_composite(composite, fg, alpha, bg) \ 2786 (composite) = (png_byte)(((png_uint_16)(fg) * (png_uint_16)(alpha) + \ 2787 (png_uint_16)(bg) * (png_uint_16)(255 - (png_uint_16)(alpha)) + \ 2788 (png_uint_16)127) / 255) 2789 2790 # define png_composite_16(composite, fg, alpha, bg) \ 2791 (composite) = (png_uint_16)(((png_uint_32)(fg) * (png_uint_32)(alpha) + \ 2792 (png_uint_32)(bg)*(png_uint_32)(65535L - (png_uint_32)(alpha)) + \ 2793 (png_uint_32)32767) / (png_uint_32)65535L) 2794 2795 #endif /* PNG_READ_COMPOSITE_NODIV_SUPPORTED */ 2796 2797 /* Inline macros to do direct reads of bytes from the input buffer. These 2798 * require that you are using an architecture that uses PNG byte ordering 2799 * (MSB first) and supports unaligned data storage. I think that PowerPC 2800 * in big-endian mode and 680x0 are the only ones that will support this. 2801 * The x86 line of processors definitely do not. The png_get_int_32() 2802 * routine also assumes we are using two's complement format for negative 2803 * values, which is almost certainly true. 2804 */ 2805 #if defined(PNG_READ_BIG_ENDIAN_SUPPORTED) 2806 # define png_get_uint_32(buf) ( *((png_uint_32p) (buf))) 2807 # define png_get_uint_16(buf) ( *((png_uint_16p) (buf))) 2808 # define png_get_int_32(buf) ( *((png_int_32p) (buf))) 2809 #else 2810 extern PNG_EXPORT(png_uint_32,png_get_uint_32) PNGARG((png_bytep buf)); 2811 extern PNG_EXPORT(png_uint_16,png_get_uint_16) PNGARG((png_bytep buf)); 2812 extern PNG_EXPORT(png_int_32,png_get_int_32) PNGARG((png_bytep buf)); 2813 #endif /* !PNG_READ_BIG_ENDIAN_SUPPORTED */ 2814 extern PNG_EXPORT(png_uint_32,png_get_uint_31) 2815 PNGARG((png_structp png_ptr, png_bytep buf)); 2816 /* No png_get_int_16 -- may be added if there's a real need for it. */ 2817 2818 /* Place a 32-bit number into a buffer in PNG byte order (big-endian). 2819 */ 2820 extern PNG_EXPORT(void,png_save_uint_32) 2821 PNGARG((png_bytep buf, png_uint_32 i)); 2822 extern PNG_EXPORT(void,png_save_int_32) 2823 PNGARG((png_bytep buf, png_int_32 i)); 2824 2825 /* Place a 16-bit number into a buffer in PNG byte order. 2826 * The parameter is declared unsigned int, not png_uint_16, 2827 * just to avoid potential problems on pre-ANSI C compilers. 2828 */ 2829 extern PNG_EXPORT(void,png_save_uint_16) 2830 PNGARG((png_bytep buf, unsigned int i)); 2831 /* No png_save_int_16 -- may be added if there's a real need for it. */ 2832 2833 /* ************************************************************************* */ 2834 2835 /* These next functions are used internally in the code. They generally 2836 * shouldn't be used unless you are writing code to add or replace some 2837 * functionality in libpng. More information about most functions can 2838 * be found in the files where the functions are located. 2839 */ 2840 2841 2842 /* Various modes of operation, that are visible to applications because 2843 * they are used for unknown chunk location. 2844 */ 2845 #define PNG_HAVE_IHDR 0x01 2846 #define PNG_HAVE_PLTE 0x02 2847 #define PNG_HAVE_IDAT 0x04 2848 #define PNG_AFTER_IDAT 0x08 /* Have complete zlib datastream */ 2849 #define PNG_HAVE_IEND 0x10 2850 2851 #if defined(PNG_INTERNAL) 2852 2853 /* More modes of operation. Note that after an init, mode is set to 2854 * zero automatically when the structure is created. 2855 */ 2856 #define PNG_HAVE_gAMA 0x20 2857 #define PNG_HAVE_cHRM 0x40 2858 #define PNG_HAVE_sRGB 0x80 2859 #define PNG_HAVE_CHUNK_HEADER 0x100 2860 #define PNG_WROTE_tIME 0x200 2861 #define PNG_WROTE_INFO_BEFORE_PLTE 0x400 2862 #define PNG_BACKGROUND_IS_GRAY 0x800 2863 #define PNG_HAVE_PNG_SIGNATURE 0x1000 2864 #define PNG_HAVE_CHUNK_AFTER_IDAT 0x2000 /* Have another chunk after IDAT */ 2865 2866 /* flags for the transformations the PNG library does on the image data */ 2867 #define PNG_BGR 0x0001 2868 #define PNG_INTERLACE 0x0002 2869 #define PNG_PACK 0x0004 2870 #define PNG_SHIFT 0x0008 2871 #define PNG_SWAP_BYTES 0x0010 2872 #define PNG_INVERT_MONO 0x0020 2873 #define PNG_DITHER 0x0040 2874 #define PNG_BACKGROUND 0x0080 2875 #define PNG_BACKGROUND_EXPAND 0x0100 2876 /* 0x0200 unused */ 2877 #define PNG_16_TO_8 0x0400 2878 #define PNG_RGBA 0x0800 2879 #define PNG_EXPAND 0x1000 2880 #define PNG_GAMMA 0x2000 2881 #define PNG_GRAY_TO_RGB 0x4000 2882 #define PNG_FILLER 0x8000L 2883 #define PNG_PACKSWAP 0x10000L 2884 #define PNG_SWAP_ALPHA 0x20000L 2885 #define PNG_STRIP_ALPHA 0x40000L 2886 #define PNG_INVERT_ALPHA 0x80000L 2887 #define PNG_USER_TRANSFORM 0x100000L 2888 #define PNG_RGB_TO_GRAY_ERR 0x200000L 2889 #define PNG_RGB_TO_GRAY_WARN 0x400000L 2890 #define PNG_RGB_TO_GRAY 0x600000L /* two bits, RGB_TO_GRAY_ERR|WARN */ 2891 /* 0x800000L Unused */ 2892 #define PNG_ADD_ALPHA 0x1000000L /* Added to libpng-1.2.7 */ 2893 #define PNG_EXPAND_tRNS 0x2000000L /* Added to libpng-1.2.9 */ 2894 /* 0x4000000L unused */ 2895 /* 0x8000000L unused */ 2896 /* 0x10000000L unused */ 2897 /* 0x20000000L unused */ 2898 /* 0x40000000L unused */ 2899 2900 /* flags for png_create_struct */ 2901 #define PNG_STRUCT_PNG 0x0001 2902 #define PNG_STRUCT_INFO 0x0002 2903 2904 /* Scaling factor for filter heuristic weighting calculations */ 2905 #define PNG_WEIGHT_SHIFT 8 2906 #define PNG_WEIGHT_FACTOR (1<<(PNG_WEIGHT_SHIFT)) 2907 #define PNG_COST_SHIFT 3 2908 #define PNG_COST_FACTOR (1<<(PNG_COST_SHIFT)) 2909 2910 /* flags for the png_ptr->flags rather than declaring a byte for each one */ 2911 #define PNG_FLAG_ZLIB_CUSTOM_STRATEGY 0x0001 2912 #define PNG_FLAG_ZLIB_CUSTOM_LEVEL 0x0002 2913 #define PNG_FLAG_ZLIB_CUSTOM_MEM_LEVEL 0x0004 2914 #define PNG_FLAG_ZLIB_CUSTOM_WINDOW_BITS 0x0008 2915 #define PNG_FLAG_ZLIB_CUSTOM_METHOD 0x0010 2916 #define PNG_FLAG_ZLIB_FINISHED 0x0020 2917 #define PNG_FLAG_ROW_INIT 0x0040 2918 #define PNG_FLAG_FILLER_AFTER 0x0080 2919 #define PNG_FLAG_CRC_ANCILLARY_USE 0x0100 2920 #define PNG_FLAG_CRC_ANCILLARY_NOWARN 0x0200 2921 #define PNG_FLAG_CRC_CRITICAL_USE 0x0400 2922 #define PNG_FLAG_CRC_CRITICAL_IGNORE 0x0800 2923 #define PNG_FLAG_FREE_PLTE 0x1000 2924 #define PNG_FLAG_FREE_TRNS 0x2000 2925 #define PNG_FLAG_FREE_HIST 0x4000 2926 #define PNG_FLAG_KEEP_UNKNOWN_CHUNKS 0x8000L 2927 #define PNG_FLAG_KEEP_UNSAFE_CHUNKS 0x10000L 2928 #define PNG_FLAG_LIBRARY_MISMATCH 0x20000L 2929 #define PNG_FLAG_STRIP_ERROR_NUMBERS 0x40000L 2930 #define PNG_FLAG_STRIP_ERROR_TEXT 0x80000L 2931 #define PNG_FLAG_MALLOC_NULL_MEM_OK 0x100000L 2932 #define PNG_FLAG_ADD_ALPHA 0x200000L /* Added to libpng-1.2.8 */ 2933 #define PNG_FLAG_STRIP_ALPHA 0x400000L /* Added to libpng-1.2.8 */ 2934 /* 0x800000L unused */ 2935 /* 0x1000000L unused */ 2936 /* 0x2000000L unused */ 2937 /* 0x4000000L unused */ 2938 /* 0x8000000L unused */ 2939 /* 0x10000000L unused */ 2940 /* 0x20000000L unused */ 2941 /* 0x40000000L unused */ 2942 2943 #define PNG_FLAG_CRC_ANCILLARY_MASK (PNG_FLAG_CRC_ANCILLARY_USE | \ 2944 PNG_FLAG_CRC_ANCILLARY_NOWARN) 2945 2946 #define PNG_FLAG_CRC_CRITICAL_MASK (PNG_FLAG_CRC_CRITICAL_USE | \ 2947 PNG_FLAG_CRC_CRITICAL_IGNORE) 2948 2949 #define PNG_FLAG_CRC_MASK (PNG_FLAG_CRC_ANCILLARY_MASK | \ 2950 PNG_FLAG_CRC_CRITICAL_MASK) 2951 2952 /* save typing and make code easier to understand */ 2953 2954 #define PNG_COLOR_DIST(c1, c2) (abs((int)((c1).red) - (int)((c2).red)) + \ 2955 abs((int)((c1).green) - (int)((c2).green)) + \ 2956 abs((int)((c1).blue) - (int)((c2).blue))) 2957 2958 /* Added to libpng-1.2.6 JB */ 2959 #define PNG_ROWBYTES(pixel_bits, width) \ 2960 ((pixel_bits) >= 8 ? \ 2961 ((width) * (((png_uint_32)(pixel_bits)) >> 3)) : \ 2962 (( ((width) * ((png_uint_32)(pixel_bits))) + 7) >> 3) ) 2963 2964 /* PNG_OUT_OF_RANGE returns true if value is outside the range 2965 ideal-delta..ideal+delta. Each argument is evaluated twice. 2966 "ideal" and "delta" should be constants, normally simple 2967 integers, "value" a variable. Added to libpng-1.2.6 JB */ 2968 #define PNG_OUT_OF_RANGE(value, ideal, delta) \ 2969 ( (value) < (ideal)-(delta) || (value) > (ideal)+(delta) ) 2970 2971 /* variables declared in png.c - only it needs to define PNG_NO_EXTERN */ 2972 #if !defined(PNG_NO_EXTERN) || defined(PNG_ALWAYS_EXTERN) 2973 /* place to hold the signature string for a PNG file. */ 2974 #ifdef PNG_USE_GLOBAL_ARRAYS 2975 PNG_EXPORT_VAR (PNG_CONST png_byte FARDATA) png_sig[8]; 2976 #else 2977 #endif 2978 #endif /* PNG_NO_EXTERN */ 2979 2980 /* Constant strings for known chunk types. If you need to add a chunk, 2981 * define the name here, and add an invocation of the macro in png.c and 2982 * wherever it's needed. 2983 */ 2984 #define PNG_IHDR png_byte png_IHDR[5] = { 73, 72, 68, 82, '\0'} 2985 #define PNG_IDAT png_byte png_IDAT[5] = { 73, 68, 65, 84, '\0'} 2986 #define PNG_IEND png_byte png_IEND[5] = { 73, 69, 78, 68, '\0'} 2987 #define PNG_PLTE png_byte png_PLTE[5] = { 80, 76, 84, 69, '\0'} 2988 #define PNG_bKGD png_byte png_bKGD[5] = { 98, 75, 71, 68, '\0'} 2989 #define PNG_cHRM png_byte png_cHRM[5] = { 99, 72, 82, 77, '\0'} 2990 #define PNG_gAMA png_byte png_gAMA[5] = {103, 65, 77, 65, '\0'} 2991 #define PNG_hIST png_byte png_hIST[5] = {104, 73, 83, 84, '\0'} 2992 #define PNG_iCCP png_byte png_iCCP[5] = {105, 67, 67, 80, '\0'} 2993 #define PNG_iTXt png_byte png_iTXt[5] = {105, 84, 88, 116, '\0'} 2994 #define PNG_oFFs png_byte png_oFFs[5] = {111, 70, 70, 115, '\0'} 2995 #define PNG_pCAL png_byte png_pCAL[5] = {112, 67, 65, 76, '\0'} 2996 #define PNG_sCAL png_byte png_sCAL[5] = {115, 67, 65, 76, '\0'} 2997 #define PNG_pHYs png_byte png_pHYs[5] = {112, 72, 89, 115, '\0'} 2998 #define PNG_sBIT png_byte png_sBIT[5] = {115, 66, 73, 84, '\0'} 2999 #define PNG_sPLT png_byte png_sPLT[5] = {115, 80, 76, 84, '\0'} 3000 #define PNG_sRGB png_byte png_sRGB[5] = {115, 82, 71, 66, '\0'} 3001 #define PNG_tEXt png_byte png_tEXt[5] = {116, 69, 88, 116, '\0'} 3002 #define PNG_tIME png_byte png_tIME[5] = {116, 73, 77, 69, '\0'} 3003 #define PNG_tRNS png_byte png_tRNS[5] = {116, 82, 78, 83, '\0'} 3004 #define PNG_zTXt png_byte png_zTXt[5] = {122, 84, 88, 116, '\0'} 3005 3006 #ifdef PNG_USE_GLOBAL_ARRAYS 3007 PNG_EXPORT_VAR (png_byte FARDATA) png_IHDR[5]; 3008 PNG_EXPORT_VAR (png_byte FARDATA) png_IDAT[5]; 3009 PNG_EXPORT_VAR (png_byte FARDATA) png_IEND[5]; 3010 PNG_EXPORT_VAR (png_byte FARDATA) png_PLTE[5]; 3011 PNG_EXPORT_VAR (png_byte FARDATA) png_bKGD[5]; 3012 PNG_EXPORT_VAR (png_byte FARDATA) png_cHRM[5]; 3013 PNG_EXPORT_VAR (png_byte FARDATA) png_gAMA[5]; 3014 PNG_EXPORT_VAR (png_byte FARDATA) png_hIST[5]; 3015 PNG_EXPORT_VAR (png_byte FARDATA) png_iCCP[5]; 3016 PNG_EXPORT_VAR (png_byte FARDATA) png_iTXt[5]; 3017 PNG_EXPORT_VAR (png_byte FARDATA) png_oFFs[5]; 3018 PNG_EXPORT_VAR (png_byte FARDATA) png_pCAL[5]; 3019 PNG_EXPORT_VAR (png_byte FARDATA) png_sCAL[5]; 3020 PNG_EXPORT_VAR (png_byte FARDATA) png_pHYs[5]; 3021 PNG_EXPORT_VAR (png_byte FARDATA) png_sBIT[5]; 3022 PNG_EXPORT_VAR (png_byte FARDATA) png_sPLT[5]; 3023 PNG_EXPORT_VAR (png_byte FARDATA) png_sRGB[5]; 3024 PNG_EXPORT_VAR (png_byte FARDATA) png_tEXt[5]; 3025 PNG_EXPORT_VAR (png_byte FARDATA) png_tIME[5]; 3026 PNG_EXPORT_VAR (png_byte FARDATA) png_tRNS[5]; 3027 PNG_EXPORT_VAR (png_byte FARDATA) png_zTXt[5]; 3028 #endif /* PNG_USE_GLOBAL_ARRAYS */ 3029 3030 #if defined(PNG_1_0_X) || defined (PNG_1_2_X) 3031 /* Initialize png_ptr struct for reading, and allocate any other memory. 3032 * (old interface - DEPRECATED - use png_create_read_struct instead). 3033 */ 3034 extern PNG_EXPORT(void,png_read_init) PNGARG((png_structp png_ptr)); 3035 #undef png_read_init 3036 #define png_read_init(png_ptr) png_read_init_3(&png_ptr, \ 3037 PNG_LIBPNG_VER_STRING, png_sizeof(png_struct)); 3038 #endif 3039 3040 extern PNG_EXPORT(void,png_read_init_3) PNGARG((png_structpp ptr_ptr, 3041 png_const_charp user_png_ver, png_size_t png_struct_size)); 3042 #if defined(PNG_1_0_X) || defined (PNG_1_2_X) 3043 extern PNG_EXPORT(void,png_read_init_2) PNGARG((png_structp png_ptr, 3044 png_const_charp user_png_ver, png_size_t png_struct_size, png_size_t 3045 png_info_size)); 3046 #endif 3047 3048 #if defined(PNG_1_0_X) || defined (PNG_1_2_X) 3049 /* Initialize png_ptr struct for writing, and allocate any other memory. 3050 * (old interface - DEPRECATED - use png_create_write_struct instead). 3051 */ 3052 extern PNG_EXPORT(void,png_write_init) PNGARG((png_structp png_ptr)); 3053 #undef png_write_init 3054 #define png_write_init(png_ptr) png_write_init_3(&png_ptr, \ 3055 PNG_LIBPNG_VER_STRING, png_sizeof(png_struct)); 3056 #endif 3057 3058 extern PNG_EXPORT(void,png_write_init_3) PNGARG((png_structpp ptr_ptr, 3059 png_const_charp user_png_ver, png_size_t png_struct_size)); 3060 extern PNG_EXPORT(void,png_write_init_2) PNGARG((png_structp png_ptr, 3061 png_const_charp user_png_ver, png_size_t png_struct_size, png_size_t 3062 png_info_size)); 3063 3064 /* Allocate memory for an internal libpng struct */ 3065 PNG_EXTERN png_voidp png_create_struct PNGARG((int type)); 3066 3067 /* Free memory from internal libpng struct */ 3068 PNG_EXTERN void png_destroy_struct PNGARG((png_voidp struct_ptr)); 3069 3070 PNG_EXTERN png_voidp png_create_struct_2 PNGARG((int type, png_malloc_ptr 3071 malloc_fn, png_voidp mem_ptr)); 3072 PNG_EXTERN void png_destroy_struct_2 PNGARG((png_voidp struct_ptr, 3073 png_free_ptr free_fn, png_voidp mem_ptr)); 3074 3075 /* Free any memory that info_ptr points to and reset struct. */ 3076 PNG_EXTERN void png_info_destroy PNGARG((png_structp png_ptr, 3077 png_infop info_ptr)); 3078 3079 #ifndef PNG_1_0_X 3080 /* Function to allocate memory for zlib. */ 3081 PNG_EXTERN voidpf png_zalloc PNGARG((voidpf png_ptr, uInt items, uInt size)); 3082 3083 /* Function to free memory for zlib */ 3084 PNG_EXTERN void png_zfree PNGARG((voidpf png_ptr, voidpf ptr)); 3085 3086 #ifdef PNG_SIZE_T 3087 /* Function to convert a sizeof an item to png_sizeof item */ 3088 PNG_EXTERN png_size_t PNGAPI png_convert_size PNGARG((size_t size)); 3089 #endif 3090 3091 /* Next four functions are used internally as callbacks. PNGAPI is required 3092 * but not PNG_EXPORT. PNGAPI added at libpng version 1.2.3. */ 3093 3094 PNG_EXTERN void PNGAPI png_default_read_data PNGARG((png_structp png_ptr, 3095 png_bytep data, png_size_t length)); 3096 3097 #ifdef PNG_PROGRESSIVE_READ_SUPPORTED 3098 PNG_EXTERN void PNGAPI png_push_fill_buffer PNGARG((png_structp png_ptr, 3099 png_bytep buffer, png_size_t length)); 3100 #endif 3101 3102 PNG_EXTERN void PNGAPI png_default_write_data PNGARG((png_structp png_ptr, 3103 png_bytep data, png_size_t length)); 3104 3105 #if defined(PNG_WRITE_FLUSH_SUPPORTED) 3106 #if !defined(PNG_NO_STDIO) 3107 PNG_EXTERN void PNGAPI png_default_flush PNGARG((png_structp png_ptr)); 3108 #endif 3109 #endif 3110 #else /* PNG_1_0_X */ 3111 #ifdef PNG_PROGRESSIVE_READ_SUPPORTED 3112 PNG_EXTERN void png_push_fill_buffer PNGARG((png_structp png_ptr, 3113 png_bytep buffer, png_size_t length)); 3114 #endif 3115 #endif /* PNG_1_0_X */ 3116 3117 /* Reset the CRC variable */ 3118 PNG_EXTERN void png_reset_crc PNGARG((png_structp png_ptr)); 3119 3120 /* Write the "data" buffer to whatever output you are using. */ 3121 PNG_EXTERN void png_write_data PNGARG((png_structp png_ptr, png_bytep data, 3122 png_size_t length)); 3123 3124 /* Read data from whatever input you are using into the "data" buffer */ 3125 PNG_EXTERN void png_read_data PNGARG((png_structp png_ptr, png_bytep data, 3126 png_size_t length)); 3127 3128 /* Read bytes into buf, and update png_ptr->crc */ 3129 PNG_EXTERN void png_crc_read PNGARG((png_structp png_ptr, png_bytep buf, 3130 png_size_t length)); 3131 3132 /* Decompress data in a chunk that uses compression */ 3133 #if defined(PNG_zTXt_SUPPORTED) || defined(PNG_iTXt_SUPPORTED) || \ 3134 defined(PNG_iCCP_SUPPORTED) || defined(PNG_sPLT_SUPPORTED) 3135 PNG_EXTERN void png_decompress_chunk PNGARG((png_structp png_ptr, 3136 int comp_type, png_size_t chunklength, 3137 png_size_t prefix_length, png_size_t *data_length)); 3138 #endif 3139 3140 /* Read "skip" bytes, read the file crc, and (optionally) verify png_ptr->crc */ 3141 PNG_EXTERN int png_crc_finish PNGARG((png_structp png_ptr, png_uint_32 skip)); 3142 3143 /* Read the CRC from the file and compare it to the libpng calculated CRC */ 3144 PNG_EXTERN int png_crc_error PNGARG((png_structp png_ptr)); 3145 3146 /* Calculate the CRC over a section of data. Note that we are only 3147 * passing a maximum of 64K on systems that have this as a memory limit, 3148 * since this is the maximum buffer size we can specify. 3149 */ 3150 PNG_EXTERN void png_calculate_crc PNGARG((png_structp png_ptr, png_bytep ptr, 3151 png_size_t length)); 3152 3153 #if defined(PNG_WRITE_FLUSH_SUPPORTED) 3154 PNG_EXTERN void png_flush PNGARG((png_structp png_ptr)); 3155 #endif 3156 3157 /* simple function to write the signature */ 3158 PNG_EXTERN void png_write_sig PNGARG((png_structp png_ptr)); 3159 3160 /* write various chunks */ 3161 3162 /* Write the IHDR chunk, and update the png_struct with the necessary 3163 * information. 3164 */ 3165 PNG_EXTERN void png_write_IHDR PNGARG((png_structp png_ptr, png_uint_32 width, 3166 png_uint_32 height, 3167 int bit_depth, int color_type, int compression_method, int filter_method, 3168 int interlace_method)); 3169 3170 PNG_EXTERN void png_write_PLTE PNGARG((png_structp png_ptr, png_colorp palette, 3171 png_uint_32 num_pal)); 3172 3173 PNG_EXTERN void png_write_IDAT PNGARG((png_structp png_ptr, png_bytep data, 3174 png_size_t length)); 3175 3176 PNG_EXTERN void png_write_IEND PNGARG((png_structp png_ptr)); 3177 3178 #if defined(PNG_WRITE_gAMA_SUPPORTED) 3179 #ifdef PNG_FLOATING_POINT_SUPPORTED 3180 PNG_EXTERN void png_write_gAMA PNGARG((png_structp png_ptr, double file_gamma)); 3181 #endif 3182 #ifdef PNG_FIXED_POINT_SUPPORTED 3183 PNG_EXTERN void png_write_gAMA_fixed PNGARG((png_structp png_ptr, png_fixed_point 3184 file_gamma)); 3185 #endif 3186 #endif 3187 3188 #if defined(PNG_WRITE_sBIT_SUPPORTED) 3189 PNG_EXTERN void png_write_sBIT PNGARG((png_structp png_ptr, png_color_8p sbit, 3190 int color_type)); 3191 #endif 3192 3193 #if defined(PNG_WRITE_cHRM_SUPPORTED) 3194 #ifdef PNG_FLOATING_POINT_SUPPORTED 3195 PNG_EXTERN void png_write_cHRM PNGARG((png_structp png_ptr, 3196 double white_x, double white_y, 3197 double red_x, double red_y, double green_x, double green_y, 3198 double blue_x, double blue_y)); 3199 #endif 3200 #ifdef PNG_FIXED_POINT_SUPPORTED 3201 PNG_EXTERN void png_write_cHRM_fixed PNGARG((png_structp png_ptr, 3202 png_fixed_point int_white_x, png_fixed_point int_white_y, 3203 png_fixed_point int_red_x, png_fixed_point int_red_y, png_fixed_point 3204 int_green_x, png_fixed_point int_green_y, png_fixed_point int_blue_x, 3205 png_fixed_point int_blue_y)); 3206 #endif 3207 #endif 3208 3209 #if defined(PNG_WRITE_sRGB_SUPPORTED) 3210 PNG_EXTERN void png_write_sRGB PNGARG((png_structp png_ptr, 3211 int intent)); 3212 #endif 3213 3214 #if defined(PNG_WRITE_iCCP_SUPPORTED) 3215 PNG_EXTERN void png_write_iCCP PNGARG((png_structp png_ptr, 3216 png_charp name, int compression_type, 3217 png_charp profile, int proflen)); 3218 /* Note to maintainer: profile should be png_bytep */ 3219 #endif 3220 3221 #if defined(PNG_WRITE_sPLT_SUPPORTED) 3222 PNG_EXTERN void png_write_sPLT PNGARG((png_structp png_ptr, 3223 png_sPLT_tp palette)); 3224 #endif 3225 3226 #if defined(PNG_WRITE_tRNS_SUPPORTED) 3227 PNG_EXTERN void png_write_tRNS PNGARG((png_structp png_ptr, png_bytep trans, 3228 png_color_16p values, int number, int color_type)); 3229 #endif 3230 3231 #if defined(PNG_WRITE_bKGD_SUPPORTED) 3232 PNG_EXTERN void png_write_bKGD PNGARG((png_structp png_ptr, 3233 png_color_16p values, int color_type)); 3234 #endif 3235 3236 #if defined(PNG_WRITE_hIST_SUPPORTED) 3237 PNG_EXTERN void png_write_hIST PNGARG((png_structp png_ptr, png_uint_16p hist, 3238 int num_hist)); 3239 #endif 3240 3241 #if defined(PNG_WRITE_TEXT_SUPPORTED) || defined(PNG_WRITE_pCAL_SUPPORTED) || \ 3242 defined(PNG_WRITE_iCCP_SUPPORTED) || defined(PNG_WRITE_sPLT_SUPPORTED) 3243 PNG_EXTERN png_size_t png_check_keyword PNGARG((png_structp png_ptr, 3244 png_charp key, png_charpp new_key)); 3245 #endif 3246 3247 #if defined(PNG_WRITE_tEXt_SUPPORTED) 3248 PNG_EXTERN void png_write_tEXt PNGARG((png_structp png_ptr, png_charp key, 3249 png_charp text, png_size_t text_len)); 3250 #endif 3251 3252 #if defined(PNG_WRITE_zTXt_SUPPORTED) 3253 PNG_EXTERN void png_write_zTXt PNGARG((png_structp png_ptr, png_charp key, 3254 png_charp text, png_size_t text_len, int compression)); 3255 #endif 3256 3257 #if defined(PNG_WRITE_iTXt_SUPPORTED) 3258 PNG_EXTERN void png_write_iTXt PNGARG((png_structp png_ptr, 3259 int compression, png_charp key, png_charp lang, png_charp lang_key, 3260 png_charp text)); 3261 #endif 3262 3263 #if defined(PNG_TEXT_SUPPORTED) /* Added at version 1.0.14 and 1.2.4 */ 3264 PNG_EXTERN int png_set_text_2 PNGARG((png_structp png_ptr, 3265 png_infop info_ptr, png_textp text_ptr, int num_text)); 3266 #endif 3267 3268 #if defined(PNG_WRITE_oFFs_SUPPORTED) 3269 PNG_EXTERN void png_write_oFFs PNGARG((png_structp png_ptr, 3270 png_int_32 x_offset, png_int_32 y_offset, int unit_type)); 3271 #endif 3272 3273 #if defined(PNG_WRITE_pCAL_SUPPORTED) 3274 PNG_EXTERN void png_write_pCAL PNGARG((png_structp png_ptr, png_charp purpose, 3275 png_int_32 X0, png_int_32 X1, int type, int nparams, 3276 png_charp units, png_charpp params)); 3277 #endif 3278 3279 #if defined(PNG_WRITE_pHYs_SUPPORTED) 3280 PNG_EXTERN void png_write_pHYs PNGARG((png_structp png_ptr, 3281 png_uint_32 x_pixels_per_unit, png_uint_32 y_pixels_per_unit, 3282 int unit_type)); 3283 #endif 3284 3285 #if defined(PNG_WRITE_tIME_SUPPORTED) 3286 PNG_EXTERN void png_write_tIME PNGARG((png_structp png_ptr, 3287 png_timep mod_time)); 3288 #endif 3289 3290 #if defined(PNG_WRITE_sCAL_SUPPORTED) 3291 #if defined(PNG_FLOATING_POINT_SUPPORTED) && !defined(PNG_NO_STDIO) 3292 PNG_EXTERN void png_write_sCAL PNGARG((png_structp png_ptr, 3293 int unit, double width, double height)); 3294 #else 3295 #ifdef PNG_FIXED_POINT_SUPPORTED 3296 PNG_EXTERN void png_write_sCAL_s PNGARG((png_structp png_ptr, 3297 int unit, png_charp width, png_charp height)); 3298 #endif 3299 #endif 3300 #endif 3301 3302 /* Called when finished processing a row of data */ 3303 PNG_EXTERN void png_write_finish_row PNGARG((png_structp png_ptr)); 3304 3305 /* Internal use only. Called before first row of data */ 3306 PNG_EXTERN void png_write_start_row PNGARG((png_structp png_ptr)); 3307 3308 #if defined(PNG_READ_GAMMA_SUPPORTED) 3309 PNG_EXTERN void png_build_gamma_table PNGARG((png_structp png_ptr)); 3310 #endif 3311 3312 /* combine a row of data, dealing with alpha, etc. if requested */ 3313 PNG_EXTERN void png_combine_row PNGARG((png_structp png_ptr, png_bytep row, 3314 int mask)); 3315 3316 #if defined(PNG_READ_INTERLACING_SUPPORTED) 3317 /* expand an interlaced row */ 3318 /* OLD pre-1.0.9 interface: 3319 PNG_EXTERN void png_do_read_interlace PNGARG((png_row_infop row_info, 3320 png_bytep row, int pass, png_uint_32 transformations)); 3321 */ 3322 PNG_EXTERN void png_do_read_interlace PNGARG((png_structp png_ptr)); 3323 #endif 3324 3325 /* GRR TO DO (2.0 or whenever): simplify other internal calling interfaces */ 3326 3327 #if defined(PNG_WRITE_INTERLACING_SUPPORTED) 3328 /* grab pixels out of a row for an interlaced pass */ 3329 PNG_EXTERN void png_do_write_interlace PNGARG((png_row_infop row_info, 3330 png_bytep row, int pass)); 3331 #endif 3332 3333 /* unfilter a row */ 3334 PNG_EXTERN void png_read_filter_row PNGARG((png_structp png_ptr, 3335 png_row_infop row_info, png_bytep row, png_bytep prev_row, int filter)); 3336 3337 /* Choose the best filter to use and filter the row data */ 3338 PNG_EXTERN void png_write_find_filter PNGARG((png_structp png_ptr, 3339 png_row_infop row_info)); 3340 3341 /* Write out the filtered row. */ 3342 PNG_EXTERN void png_write_filtered_row PNGARG((png_structp png_ptr, 3343 png_bytep filtered_row)); 3344 /* finish a row while reading, dealing with interlacing passes, etc. */ 3345 PNG_EXTERN void png_read_finish_row PNGARG((png_structp png_ptr)); 3346 3347 /* initialize the row buffers, etc. */ 3348 PNG_EXTERN void png_read_start_row PNGARG((png_structp png_ptr)); 3349 /* optional call to update the users info structure */ 3350 PNG_EXTERN void png_read_transform_info PNGARG((png_structp png_ptr, 3351 png_infop info_ptr)); 3352 3353 /* these are the functions that do the transformations */ 3354 #if defined(PNG_READ_FILLER_SUPPORTED) 3355 PNG_EXTERN void png_do_read_filler PNGARG((png_row_infop row_info, 3356 png_bytep row, png_uint_32 filler, png_uint_32 flags)); 3357 #endif 3358 3359 #if defined(PNG_READ_SWAP_ALPHA_SUPPORTED) 3360 PNG_EXTERN void png_do_read_swap_alpha PNGARG((png_row_infop row_info, 3361 png_bytep row)); 3362 #endif 3363 3364 #if defined(PNG_WRITE_SWAP_ALPHA_SUPPORTED) 3365 PNG_EXTERN void png_do_write_swap_alpha PNGARG((png_row_infop row_info, 3366 png_bytep row)); 3367 #endif 3368 3369 #if defined(PNG_READ_INVERT_ALPHA_SUPPORTED) 3370 PNG_EXTERN void png_do_read_invert_alpha PNGARG((png_row_infop row_info, 3371 png_bytep row)); 3372 #endif 3373 3374 #if defined(PNG_WRITE_INVERT_ALPHA_SUPPORTED) 3375 PNG_EXTERN void png_do_write_invert_alpha PNGARG((png_row_infop row_info, 3376 png_bytep row)); 3377 #endif 3378 3379 #if defined(PNG_WRITE_FILLER_SUPPORTED) || \ 3380 defined(PNG_READ_STRIP_ALPHA_SUPPORTED) 3381 PNG_EXTERN void png_do_strip_filler PNGARG((png_row_infop row_info, 3382 png_bytep row, png_uint_32 flags)); 3383 #endif 3384 3385 #if defined(PNG_READ_SWAP_SUPPORTED) || defined(PNG_WRITE_SWAP_SUPPORTED) 3386 PNG_EXTERN void png_do_swap PNGARG((png_row_infop row_info, png_bytep row)); 3387 #endif 3388 3389 #if defined(PNG_READ_PACKSWAP_SUPPORTED) || defined(PNG_WRITE_PACKSWAP_SUPPORTED) 3390 PNG_EXTERN void png_do_packswap PNGARG((png_row_infop row_info, png_bytep row)); 3391 #endif 3392 3393 #if defined(PNG_READ_RGB_TO_GRAY_SUPPORTED) 3394 PNG_EXTERN int png_do_rgb_to_gray PNGARG((png_structp png_ptr, png_row_infop 3395 row_info, png_bytep row)); 3396 #endif 3397 3398 #if defined(PNG_READ_GRAY_TO_RGB_SUPPORTED) 3399 PNG_EXTERN void png_do_gray_to_rgb PNGARG((png_row_infop row_info, 3400 png_bytep row)); 3401 #endif 3402 3403 #if defined(PNG_READ_PACK_SUPPORTED) 3404 PNG_EXTERN void png_do_unpack PNGARG((png_row_infop row_info, png_bytep row)); 3405 #endif 3406 3407 #if defined(PNG_READ_SHIFT_SUPPORTED) 3408 PNG_EXTERN void png_do_unshift PNGARG((png_row_infop row_info, png_bytep row, 3409 png_color_8p sig_bits)); 3410 #endif 3411 3412 #if defined(PNG_READ_INVERT_SUPPORTED) || defined(PNG_WRITE_INVERT_SUPPORTED) 3413 PNG_EXTERN void png_do_invert PNGARG((png_row_infop row_info, png_bytep row)); 3414 #endif 3415 3416 #if defined(PNG_READ_16_TO_8_SUPPORTED) 3417 PNG_EXTERN void png_do_chop PNGARG((png_row_infop row_info, png_bytep row)); 3418 #endif 3419 3420 #if defined(PNG_READ_DITHER_SUPPORTED) 3421 PNG_EXTERN void png_do_dither PNGARG((png_row_infop row_info, 3422 png_bytep row, png_bytep palette_lookup, png_bytep dither_lookup)); 3423 3424 # if defined(PNG_CORRECT_PALETTE_SUPPORTED) 3425 PNG_EXTERN void png_correct_palette PNGARG((png_structp png_ptr, 3426 png_colorp palette, int num_palette)); 3427 # endif 3428 #endif 3429 3430 #if defined(PNG_READ_BGR_SUPPORTED) || defined(PNG_WRITE_BGR_SUPPORTED) 3431 PNG_EXTERN void png_do_bgr PNGARG((png_row_infop row_info, png_bytep row)); 3432 #endif 3433 3434 #if defined(PNG_WRITE_PACK_SUPPORTED) 3435 PNG_EXTERN void png_do_pack PNGARG((png_row_infop row_info, 3436 png_bytep row, png_uint_32 bit_depth)); 3437 #endif 3438 3439 #if defined(PNG_WRITE_SHIFT_SUPPORTED) 3440 PNG_EXTERN void png_do_shift PNGARG((png_row_infop row_info, png_bytep row, 3441 png_color_8p bit_depth)); 3442 #endif 3443 3444 #if defined(PNG_READ_BACKGROUND_SUPPORTED) 3445 #if defined(PNG_READ_GAMMA_SUPPORTED) 3446 PNG_EXTERN void png_do_background PNGARG((png_row_infop row_info, png_bytep row, 3447 png_color_16p trans_values, png_color_16p background, 3448 png_color_16p background_1, 3449 png_bytep gamma_table, png_bytep gamma_from_1, png_bytep gamma_to_1, 3450 png_uint_16pp gamma_16, png_uint_16pp gamma_16_from_1, 3451 png_uint_16pp gamma_16_to_1, int gamma_shift)); 3452 #else 3453 PNG_EXTERN void png_do_background PNGARG((png_row_infop row_info, png_bytep row, 3454 png_color_16p trans_values, png_color_16p background)); 3455 #endif 3456 #endif 3457 3458 #if defined(PNG_READ_GAMMA_SUPPORTED) 3459 PNG_EXTERN void png_do_gamma PNGARG((png_row_infop row_info, png_bytep row, 3460 png_bytep gamma_table, png_uint_16pp gamma_16_table, 3461 int gamma_shift)); 3462 #endif 3463 3464 #if defined(PNG_READ_EXPAND_SUPPORTED) 3465 PNG_EXTERN void png_do_expand_palette PNGARG((png_row_infop row_info, 3466 png_bytep row, png_colorp palette, png_bytep trans, int num_trans)); 3467 PNG_EXTERN void png_do_expand PNGARG((png_row_infop row_info, 3468 png_bytep row, png_color_16p trans_value)); 3469 #endif 3470 3471 /* The following decodes the appropriate chunks, and does error correction, 3472 * then calls the appropriate callback for the chunk if it is valid. 3473 */ 3474 3475 /* decode the IHDR chunk */ 3476 PNG_EXTERN void png_handle_IHDR PNGARG((png_structp png_ptr, png_infop info_ptr, 3477 png_uint_32 length)); 3478 PNG_EXTERN void png_handle_PLTE PNGARG((png_structp png_ptr, png_infop info_ptr, 3479 png_uint_32 length)); 3480 PNG_EXTERN void png_handle_IEND PNGARG((png_structp png_ptr, png_infop info_ptr, 3481 png_uint_32 length)); 3482 3483 #if defined(PNG_READ_bKGD_SUPPORTED) 3484 PNG_EXTERN void png_handle_bKGD PNGARG((png_structp png_ptr, png_infop info_ptr, 3485 png_uint_32 length)); 3486 #endif 3487 3488 #if defined(PNG_READ_cHRM_SUPPORTED) 3489 PNG_EXTERN void png_handle_cHRM PNGARG((png_structp png_ptr, png_infop info_ptr, 3490 png_uint_32 length)); 3491 #endif 3492 3493 #if defined(PNG_READ_gAMA_SUPPORTED) 3494 PNG_EXTERN void png_handle_gAMA PNGARG((png_structp png_ptr, png_infop info_ptr, 3495 png_uint_32 length)); 3496 #endif 3497 3498 #if defined(PNG_READ_hIST_SUPPORTED) 3499 PNG_EXTERN void png_handle_hIST PNGARG((png_structp png_ptr, png_infop info_ptr, 3500 png_uint_32 length)); 3501 #endif 3502 3503 #if defined(PNG_READ_iCCP_SUPPORTED) 3504 extern void png_handle_iCCP PNGARG((png_structp png_ptr, png_infop info_ptr, 3505 png_uint_32 length)); 3506 #endif /* PNG_READ_iCCP_SUPPORTED */ 3507 3508 #if defined(PNG_READ_iTXt_SUPPORTED) 3509 PNG_EXTERN void png_handle_iTXt PNGARG((png_structp png_ptr, png_infop info_ptr, 3510 png_uint_32 length)); 3511 #endif 3512 3513 #if defined(PNG_READ_oFFs_SUPPORTED) 3514 PNG_EXTERN void png_handle_oFFs PNGARG((png_structp png_ptr, png_infop info_ptr, 3515 png_uint_32 length)); 3516 #endif 3517 3518 #if defined(PNG_READ_pCAL_SUPPORTED) 3519 PNG_EXTERN void png_handle_pCAL PNGARG((png_structp png_ptr, png_infop info_ptr, 3520 png_uint_32 length)); 3521 #endif 3522 3523 #if defined(PNG_READ_pHYs_SUPPORTED) 3524 PNG_EXTERN void png_handle_pHYs PNGARG((png_structp png_ptr, png_infop info_ptr, 3525 png_uint_32 length)); 3526 #endif 3527 3528 #if defined(PNG_READ_sBIT_SUPPORTED) 3529 PNG_EXTERN void png_handle_sBIT PNGARG((png_structp png_ptr, png_infop info_ptr, 3530 png_uint_32 length)); 3531 #endif 3532 3533 #if defined(PNG_READ_sCAL_SUPPORTED) 3534 PNG_EXTERN void png_handle_sCAL PNGARG((png_structp png_ptr, png_infop info_ptr, 3535 png_uint_32 length)); 3536 #endif 3537 3538 #if defined(PNG_READ_sPLT_SUPPORTED) 3539 extern void png_handle_sPLT PNGARG((png_structp png_ptr, png_infop info_ptr, 3540 png_uint_32 length)); 3541 #endif /* PNG_READ_sPLT_SUPPORTED */ 3542 3543 #if defined(PNG_READ_sRGB_SUPPORTED) 3544 PNG_EXTERN void png_handle_sRGB PNGARG((png_structp png_ptr, png_infop info_ptr, 3545 png_uint_32 length)); 3546 #endif 3547 3548 #if defined(PNG_READ_tEXt_SUPPORTED) 3549 PNG_EXTERN void png_handle_tEXt PNGARG((png_structp png_ptr, png_infop info_ptr, 3550 png_uint_32 length)); 3551 #endif 3552 3553 #if defined(PNG_READ_tIME_SUPPORTED) 3554 PNG_EXTERN void png_handle_tIME PNGARG((png_structp png_ptr, png_infop info_ptr, 3555 png_uint_32 length)); 3556 #endif 3557 3558 #if defined(PNG_READ_tRNS_SUPPORTED) 3559 PNG_EXTERN void png_handle_tRNS PNGARG((png_structp png_ptr, png_infop info_ptr, 3560 png_uint_32 length)); 3561 #endif 3562 3563 #if defined(PNG_READ_zTXt_SUPPORTED) 3564 PNG_EXTERN void png_handle_zTXt PNGARG((png_structp png_ptr, png_infop info_ptr, 3565 png_uint_32 length)); 3566 #endif 3567 3568 PNG_EXTERN void png_handle_unknown PNGARG((png_structp png_ptr, 3569 png_infop info_ptr, png_uint_32 length)); 3570 3571 PNG_EXTERN void png_check_chunk_name PNGARG((png_structp png_ptr, 3572 png_bytep chunk_name)); 3573 3574 /* handle the transformations for reading and writing */ 3575 PNG_EXTERN void png_do_read_transformations PNGARG((png_structp png_ptr)); 3576 PNG_EXTERN void png_do_write_transformations PNGARG((png_structp png_ptr)); 3577 3578 PNG_EXTERN void png_init_read_transformations PNGARG((png_structp png_ptr)); 3579 3580 #ifdef PNG_PROGRESSIVE_READ_SUPPORTED 3581 PNG_EXTERN void png_push_read_chunk PNGARG((png_structp png_ptr, 3582 png_infop info_ptr)); 3583 PNG_EXTERN void png_push_read_sig PNGARG((png_structp png_ptr, 3584 png_infop info_ptr)); 3585 PNG_EXTERN void png_push_check_crc PNGARG((png_structp png_ptr)); 3586 PNG_EXTERN void png_push_crc_skip PNGARG((png_structp png_ptr, 3587 png_uint_32 length)); 3588 PNG_EXTERN void png_push_crc_finish PNGARG((png_structp png_ptr)); 3589 PNG_EXTERN void png_push_save_buffer PNGARG((png_structp png_ptr)); 3590 PNG_EXTERN void png_push_restore_buffer PNGARG((png_structp png_ptr, 3591 png_bytep buffer, png_size_t buffer_length)); 3592 PNG_EXTERN void png_push_read_IDAT PNGARG((png_structp png_ptr)); 3593 PNG_EXTERN void png_process_IDAT_data PNGARG((png_structp png_ptr, 3594 png_bytep buffer, png_size_t buffer_length)); 3595 PNG_EXTERN void png_push_process_row PNGARG((png_structp png_ptr)); 3596 PNG_EXTERN void png_push_handle_unknown PNGARG((png_structp png_ptr, 3597 png_infop info_ptr, png_uint_32 length)); 3598 PNG_EXTERN void png_push_have_info PNGARG((png_structp png_ptr, 3599 png_infop info_ptr)); 3600 PNG_EXTERN void png_push_have_end PNGARG((png_structp png_ptr, 3601 png_infop info_ptr)); 3602 PNG_EXTERN void png_push_have_row PNGARG((png_structp png_ptr, png_bytep row)); 3603 PNG_EXTERN void png_push_read_end PNGARG((png_structp png_ptr, 3604 png_infop info_ptr)); 3605 PNG_EXTERN void png_process_some_data PNGARG((png_structp png_ptr, 3606 png_infop info_ptr)); 3607 PNG_EXTERN void png_read_push_finish_row PNGARG((png_structp png_ptr)); 3608 #if defined(PNG_READ_tEXt_SUPPORTED) 3609 PNG_EXTERN void png_push_handle_tEXt PNGARG((png_structp png_ptr, 3610 png_infop info_ptr, png_uint_32 length)); 3611 PNG_EXTERN void png_push_read_tEXt PNGARG((png_structp png_ptr, 3612 png_infop info_ptr)); 3613 #endif 3614 #if defined(PNG_READ_zTXt_SUPPORTED) 3615 PNG_EXTERN void png_push_handle_zTXt PNGARG((png_structp png_ptr, 3616 png_infop info_ptr, png_uint_32 length)); 3617 PNG_EXTERN void png_push_read_zTXt PNGARG((png_structp png_ptr, 3618 png_infop info_ptr)); 3619 #endif 3620 #if defined(PNG_READ_iTXt_SUPPORTED) 3621 PNG_EXTERN void png_push_handle_iTXt PNGARG((png_structp png_ptr, 3622 png_infop info_ptr, png_uint_32 length)); 3623 PNG_EXTERN void png_push_read_iTXt PNGARG((png_structp png_ptr, 3624 png_infop info_ptr)); 3625 #endif 3626 3627 #endif /* PNG_PROGRESSIVE_READ_SUPPORTED */ 3628 3629 #ifdef PNG_MNG_FEATURES_SUPPORTED 3630 PNG_EXTERN void png_do_read_intrapixel PNGARG((png_row_infop row_info, 3631 png_bytep row)); 3632 PNG_EXTERN void png_do_write_intrapixel PNGARG((png_row_infop row_info, 3633 png_bytep row)); 3634 #endif 3635 3636 #if defined(PNG_ASSEMBLER_CODE_SUPPORTED) 3637 #if defined(PNG_MMX_CODE_SUPPORTED) 3638 /* png.c */ /* PRIVATE */ 3639 PNG_EXTERN void png_init_mmx_flags PNGARG((png_structp png_ptr)); 3640 #endif 3641 #endif 3642 3643 #if defined(PNG_INCH_CONVERSIONS) && defined(PNG_FLOATING_POINT_SUPPORTED) 3644 PNG_EXTERN png_uint_32 png_get_pixels_per_inch PNGARG((png_structp png_ptr, 3645 png_infop info_ptr)); 3646 3647 PNG_EXTERN png_uint_32 png_get_x_pixels_per_inch PNGARG((png_structp png_ptr, 3648 png_infop info_ptr)); 3649 3650 PNG_EXTERN png_uint_32 png_get_y_pixels_per_inch PNGARG((png_structp png_ptr, 3651 png_infop info_ptr)); 3652 3653 PNG_EXTERN float png_get_x_offset_inches PNGARG((png_structp png_ptr, 3654 png_infop info_ptr)); 3655 3656 PNG_EXTERN float png_get_y_offset_inches PNGARG((png_structp png_ptr, 3657 png_infop info_ptr)); 3658 3659 #if defined(PNG_pHYs_SUPPORTED) 3660 PNG_EXTERN png_uint_32 png_get_pHYs_dpi PNGARG((png_structp png_ptr, 3661 png_infop info_ptr, png_uint_32 *res_x, png_uint_32 *res_y, int *unit_type)); 3662 #endif /* PNG_pHYs_SUPPORTED */ 3663 #endif /* PNG_INCH_CONVERSIONS && PNG_FLOATING_POINT_SUPPORTED */ 3664 3665 /* Read the chunk header (length + type name) */ 3666 PNG_EXTERN png_uint_32 png_read_chunk_header PNGARG((png_structp png_ptr)); 3667 3668 /* Added at libpng version 1.2.34 */ 3669 #if defined(PNG_cHRM_SUPPORTED) 3670 PNG_EXTERN int png_check_cHRM_fixed PNGARG((png_structp png_ptr, 3671 png_fixed_point int_white_x, png_fixed_point int_white_y, 3672 png_fixed_point int_red_x, png_fixed_point int_red_y, png_fixed_point 3673 int_green_x, png_fixed_point int_green_y, png_fixed_point int_blue_x, 3674 png_fixed_point int_blue_y)); 3675 #endif 3676 3677 /* Maintainer: Put new private prototypes here ^ and in libpngpf.3 */ 3678 3679 #endif /* PNG_INTERNAL */ 3680 3681 #ifdef __cplusplus 3682 } 3683 #endif 3684 3685 #endif /* PNG_VERSION_INFO_ONLY */ 3686 /* do not put anything past this line */ 3687 #endif /* PNG_H */ 3688