1 /* png.h - header file for PNG reference library 2 * 3 * libpng version 1.2.44 - June 26, 2010 4 * Copyright (c) 1998-2010 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 * This code is released under the libpng license (See LICENSE, below) 9 * 10 * Authors and maintainers: 11 * libpng versions 0.71, May 1995, through 0.88, January 1996: Guy Schalnat 12 * libpng versions 0.89c, June 1996, through 0.96, May 1997: Andreas Dilger 13 * libpng versions 0.97, January 1998, through 1.2.44 - June 26, 2010: Glenn 14 * See also "Contributing Authors", below. 15 * 16 * Note about libpng version numbers: 17 * 18 * Due to various miscommunications, unforeseen code incompatibilities 19 * and occasional factors outside the authors' control, version numbering 20 * on the library has not always been consistent and straightforward. 21 * The following table summarizes matters since version 0.89c, which was 22 * the first widely used release: 23 * 24 * source png.h png.h shared-lib 25 * version string int version 26 * ------- ------ ----- ---------- 27 * 0.89c "1.0 beta 3" 0.89 89 1.0.89 28 * 0.90 "1.0 beta 4" 0.90 90 0.90 [should have been 2.0.90] 29 * 0.95 "1.0 beta 5" 0.95 95 0.95 [should have been 2.0.95] 30 * 0.96 "1.0 beta 6" 0.96 96 0.96 [should have been 2.0.96] 31 * 0.97b "1.00.97 beta 7" 1.00.97 97 1.0.1 [should have been 2.0.97] 32 * 0.97c 0.97 97 2.0.97 33 * 0.98 0.98 98 2.0.98 34 * 0.99 0.99 98 2.0.99 35 * 0.99a-m 0.99 99 2.0.99 36 * 1.00 1.00 100 2.1.0 [100 should be 10000] 37 * 1.0.0 (from here on, the 100 2.1.0 [100 should be 10000] 38 * 1.0.1 png.h string is 10001 2.1.0 39 * 1.0.1a-e identical to the 10002 from here on, the shared library 40 * 1.0.2 source version) 10002 is 2.V where V is the source code 41 * 1.0.2a-b 10003 version, except as noted. 42 * 1.0.3 10003 43 * 1.0.3a-d 10004 44 * 1.0.4 10004 45 * 1.0.4a-f 10005 46 * 1.0.5 (+ 2 patches) 10005 47 * 1.0.5a-d 10006 48 * 1.0.5e-r 10100 (not source compatible) 49 * 1.0.5s-v 10006 (not binary compatible) 50 * 1.0.6 (+ 3 patches) 10006 (still binary incompatible) 51 * 1.0.6d-f 10007 (still binary incompatible) 52 * 1.0.6g 10007 53 * 1.0.6h 10007 10.6h (testing xy.z so-numbering) 54 * 1.0.6i 10007 10.6i 55 * 1.0.6j 10007 2.1.0.6j (incompatible with 1.0.0) 56 * 1.0.7beta11-14 DLLNUM 10007 2.1.0.7beta11-14 (binary compatible) 57 * 1.0.7beta15-18 1 10007 2.1.0.7beta15-18 (binary compatible) 58 * 1.0.7rc1-2 1 10007 2.1.0.7rc1-2 (binary compatible) 59 * 1.0.7 1 10007 (still compatible) 60 * 1.0.8beta1-4 1 10008 2.1.0.8beta1-4 61 * 1.0.8rc1 1 10008 2.1.0.8rc1 62 * 1.0.8 1 10008 2.1.0.8 63 * 1.0.9beta1-6 1 10009 2.1.0.9beta1-6 64 * 1.0.9rc1 1 10009 2.1.0.9rc1 65 * 1.0.9beta7-10 1 10009 2.1.0.9beta7-10 66 * 1.0.9rc2 1 10009 2.1.0.9rc2 67 * 1.0.9 1 10009 2.1.0.9 68 * 1.0.10beta1 1 10010 2.1.0.10beta1 69 * 1.0.10rc1 1 10010 2.1.0.10rc1 70 * 1.0.10 1 10010 2.1.0.10 71 * 1.0.11beta1-3 1 10011 2.1.0.11beta1-3 72 * 1.0.11rc1 1 10011 2.1.0.11rc1 73 * 1.0.11 1 10011 2.1.0.11 74 * 1.0.12beta1-2 2 10012 2.1.0.12beta1-2 75 * 1.0.12rc1 2 10012 2.1.0.12rc1 76 * 1.0.12 2 10012 2.1.0.12 77 * 1.1.0a-f - 10100 2.1.1.0a-f (branch abandoned) 78 * 1.2.0beta1-2 2 10200 2.1.2.0beta1-2 79 * 1.2.0beta3-5 3 10200 3.1.2.0beta3-5 80 * 1.2.0rc1 3 10200 3.1.2.0rc1 81 * 1.2.0 3 10200 3.1.2.0 82 * 1.2.1beta1-4 3 10201 3.1.2.1beta1-4 83 * 1.2.1rc1-2 3 10201 3.1.2.1rc1-2 84 * 1.2.1 3 10201 3.1.2.1 85 * 1.2.2beta1-6 12 10202 12.so.0.1.2.2beta1-6 86 * 1.0.13beta1 10 10013 10.so.0.1.0.13beta1 87 * 1.0.13rc1 10 10013 10.so.0.1.0.13rc1 88 * 1.2.2rc1 12 10202 12.so.0.1.2.2rc1 89 * 1.0.13 10 10013 10.so.0.1.0.13 90 * 1.2.2 12 10202 12.so.0.1.2.2 91 * 1.2.3rc1-6 12 10203 12.so.0.1.2.3rc1-6 92 * 1.2.3 12 10203 12.so.0.1.2.3 93 * 1.2.4beta1-3 13 10204 12.so.0.1.2.4beta1-3 94 * 1.0.14rc1 13 10014 10.so.0.1.0.14rc1 95 * 1.2.4rc1 13 10204 12.so.0.1.2.4rc1 96 * 1.0.14 10 10014 10.so.0.1.0.14 97 * 1.2.4 13 10204 12.so.0.1.2.4 98 * 1.2.5beta1-2 13 10205 12.so.0.1.2.5beta1-2 99 * 1.0.15rc1-3 10 10015 10.so.0.1.0.15rc1-3 100 * 1.2.5rc1-3 13 10205 12.so.0.1.2.5rc1-3 101 * 1.0.15 10 10015 10.so.0.1.0.15 102 * 1.2.5 13 10205 12.so.0.1.2.5 103 * 1.2.6beta1-4 13 10206 12.so.0.1.2.6beta1-4 104 * 1.0.16 10 10016 10.so.0.1.0.16 105 * 1.2.6 13 10206 12.so.0.1.2.6 106 * 1.2.7beta1-2 13 10207 12.so.0.1.2.7beta1-2 107 * 1.0.17rc1 10 10017 10.so.0.1.0.17rc1 108 * 1.2.7rc1 13 10207 12.so.0.1.2.7rc1 109 * 1.0.17 10 10017 10.so.0.1.0.17 110 * 1.2.7 13 10207 12.so.0.1.2.7 111 * 1.2.8beta1-5 13 10208 12.so.0.1.2.8beta1-5 112 * 1.0.18rc1-5 10 10018 10.so.0.1.0.18rc1-5 113 * 1.2.8rc1-5 13 10208 12.so.0.1.2.8rc1-5 114 * 1.0.18 10 10018 10.so.0.1.0.18 115 * 1.2.8 13 10208 12.so.0.1.2.8 116 * 1.2.9beta1-3 13 10209 12.so.0.1.2.9beta1-3 117 * 1.2.9beta4-11 13 10209 12.so.0.9[.0] 118 * 1.2.9rc1 13 10209 12.so.0.9[.0] 119 * 1.2.9 13 10209 12.so.0.9[.0] 120 * 1.2.10beta1-8 13 10210 12.so.0.10[.0] 121 * 1.2.10rc1-3 13 10210 12.so.0.10[.0] 122 * 1.2.10 13 10210 12.so.0.10[.0] 123 * 1.2.11beta1-4 13 10211 12.so.0.11[.0] 124 * 1.0.19rc1-5 10 10019 10.so.0.19[.0] 125 * 1.2.11rc1-5 13 10211 12.so.0.11[.0] 126 * 1.0.19 10 10019 10.so.0.19[.0] 127 * 1.2.11 13 10211 12.so.0.11[.0] 128 * 1.0.20 10 10020 10.so.0.20[.0] 129 * 1.2.12 13 10212 12.so.0.12[.0] 130 * 1.2.13beta1 13 10213 12.so.0.13[.0] 131 * 1.0.21 10 10021 10.so.0.21[.0] 132 * 1.2.13 13 10213 12.so.0.13[.0] 133 * 1.2.14beta1-2 13 10214 12.so.0.14[.0] 134 * 1.0.22rc1 10 10022 10.so.0.22[.0] 135 * 1.2.14rc1 13 10214 12.so.0.14[.0] 136 * 1.0.22 10 10022 10.so.0.22[.0] 137 * 1.2.14 13 10214 12.so.0.14[.0] 138 * 1.2.15beta1-6 13 10215 12.so.0.15[.0] 139 * 1.0.23rc1-5 10 10023 10.so.0.23[.0] 140 * 1.2.15rc1-5 13 10215 12.so.0.15[.0] 141 * 1.0.23 10 10023 10.so.0.23[.0] 142 * 1.2.15 13 10215 12.so.0.15[.0] 143 * 1.2.16beta1-2 13 10216 12.so.0.16[.0] 144 * 1.2.16rc1 13 10216 12.so.0.16[.0] 145 * 1.0.24 10 10024 10.so.0.24[.0] 146 * 1.2.16 13 10216 12.so.0.16[.0] 147 * 1.2.17beta1-2 13 10217 12.so.0.17[.0] 148 * 1.0.25rc1 10 10025 10.so.0.25[.0] 149 * 1.2.17rc1-3 13 10217 12.so.0.17[.0] 150 * 1.0.25 10 10025 10.so.0.25[.0] 151 * 1.2.17 13 10217 12.so.0.17[.0] 152 * 1.0.26 10 10026 10.so.0.26[.0] 153 * 1.2.18 13 10218 12.so.0.18[.0] 154 * 1.2.19beta1-31 13 10219 12.so.0.19[.0] 155 * 1.0.27rc1-6 10 10027 10.so.0.27[.0] 156 * 1.2.19rc1-6 13 10219 12.so.0.19[.0] 157 * 1.0.27 10 10027 10.so.0.27[.0] 158 * 1.2.19 13 10219 12.so.0.19[.0] 159 * 1.2.20beta01-04 13 10220 12.so.0.20[.0] 160 * 1.0.28rc1-6 10 10028 10.so.0.28[.0] 161 * 1.2.20rc1-6 13 10220 12.so.0.20[.0] 162 * 1.0.28 10 10028 10.so.0.28[.0] 163 * 1.2.20 13 10220 12.so.0.20[.0] 164 * 1.2.21beta1-2 13 10221 12.so.0.21[.0] 165 * 1.2.21rc1-3 13 10221 12.so.0.21[.0] 166 * 1.0.29 10 10029 10.so.0.29[.0] 167 * 1.2.21 13 10221 12.so.0.21[.0] 168 * 1.2.22beta1-4 13 10222 12.so.0.22[.0] 169 * 1.0.30rc1 10 10030 10.so.0.30[.0] 170 * 1.2.22rc1 13 10222 12.so.0.22[.0] 171 * 1.0.30 10 10030 10.so.0.30[.0] 172 * 1.2.22 13 10222 12.so.0.22[.0] 173 * 1.2.23beta01-05 13 10223 12.so.0.23[.0] 174 * 1.2.23rc01 13 10223 12.so.0.23[.0] 175 * 1.2.23 13 10223 12.so.0.23[.0] 176 * 1.2.24beta01-02 13 10224 12.so.0.24[.0] 177 * 1.2.24rc01 13 10224 12.so.0.24[.0] 178 * 1.2.24 13 10224 12.so.0.24[.0] 179 * 1.2.25beta01-06 13 10225 12.so.0.25[.0] 180 * 1.2.25rc01-02 13 10225 12.so.0.25[.0] 181 * 1.0.31 10 10031 10.so.0.31[.0] 182 * 1.2.25 13 10225 12.so.0.25[.0] 183 * 1.2.26beta01-06 13 10226 12.so.0.26[.0] 184 * 1.2.26rc01 13 10226 12.so.0.26[.0] 185 * 1.2.26 13 10226 12.so.0.26[.0] 186 * 1.0.32 10 10032 10.so.0.32[.0] 187 * 1.2.27beta01-06 13 10227 12.so.0.27[.0] 188 * 1.2.27rc01 13 10227 12.so.0.27[.0] 189 * 1.0.33 10 10033 10.so.0.33[.0] 190 * 1.2.27 13 10227 12.so.0.27[.0] 191 * 1.0.34 10 10034 10.so.0.34[.0] 192 * 1.2.28 13 10228 12.so.0.28[.0] 193 * 1.2.29beta01-03 13 10229 12.so.0.29[.0] 194 * 1.2.29rc01 13 10229 12.so.0.29[.0] 195 * 1.0.35 10 10035 10.so.0.35[.0] 196 * 1.2.29 13 10229 12.so.0.29[.0] 197 * 1.0.37 10 10037 10.so.0.37[.0] 198 * 1.2.30beta01-04 13 10230 12.so.0.30[.0] 199 * 1.0.38rc01-08 10 10038 10.so.0.38[.0] 200 * 1.2.30rc01-08 13 10230 12.so.0.30[.0] 201 * 1.0.38 10 10038 10.so.0.38[.0] 202 * 1.2.30 13 10230 12.so.0.30[.0] 203 * 1.0.39rc01-03 10 10039 10.so.0.39[.0] 204 * 1.2.31rc01-03 13 10231 12.so.0.31[.0] 205 * 1.0.39 10 10039 10.so.0.39[.0] 206 * 1.2.31 13 10231 12.so.0.31[.0] 207 * 1.2.32beta01-02 13 10232 12.so.0.32[.0] 208 * 1.0.40rc01 10 10040 10.so.0.40[.0] 209 * 1.2.32rc01 13 10232 12.so.0.32[.0] 210 * 1.0.40 10 10040 10.so.0.40[.0] 211 * 1.2.32 13 10232 12.so.0.32[.0] 212 * 1.2.33beta01-02 13 10233 12.so.0.33[.0] 213 * 1.2.33rc01-02 13 10233 12.so.0.33[.0] 214 * 1.0.41rc01 10 10041 10.so.0.41[.0] 215 * 1.2.33 13 10233 12.so.0.33[.0] 216 * 1.0.41 10 10041 10.so.0.41[.0] 217 * 1.2.34beta01-07 13 10234 12.so.0.34[.0] 218 * 1.0.42rc01 10 10042 10.so.0.42[.0] 219 * 1.2.34rc01 13 10234 12.so.0.34[.0] 220 * 1.0.42 10 10042 10.so.0.42[.0] 221 * 1.2.34 13 10234 12.so.0.34[.0] 222 * 1.2.35beta01-03 13 10235 12.so.0.35[.0] 223 * 1.0.43rc01-02 10 10043 10.so.0.43[.0] 224 * 1.2.35rc01-02 13 10235 12.so.0.35[.0] 225 * 1.0.43 10 10043 10.so.0.43[.0] 226 * 1.2.35 13 10235 12.so.0.35[.0] 227 * 1.2.36beta01-05 13 10236 12.so.0.36[.0] 228 * 1.2.36rc01 13 10236 12.so.0.36[.0] 229 * 1.0.44 10 10044 10.so.0.44[.0] 230 * 1.2.36 13 10236 12.so.0.36[.0] 231 * 1.2.37beta01-03 13 10237 12.so.0.37[.0] 232 * 1.2.37rc01 13 10237 12.so.0.37[.0] 233 * 1.2.37 13 10237 12.so.0.37[.0] 234 * 1.2.45 10 10045 12.so.0.45[.0] 235 * 1.0.46 10 10046 10.so.0.46[.0] 236 * 1.2.38beta01 13 10238 12.so.0.38[.0] 237 * 1.2.38rc01-03 13 10238 12.so.0.38[.0] 238 * 1.0.47 10 10047 10.so.0.47[.0] 239 * 1.2.38 13 10238 12.so.0.38[.0] 240 * 1.2.39beta01-05 13 10239 12.so.0.39[.0] 241 * 1.2.39rc01 13 10239 12.so.0.39[.0] 242 * 1.0.48 10 10048 10.so.0.48[.0] 243 * 1.2.39 13 10239 12.so.0.39[.0] 244 * 1.2.40beta01 13 10240 12.so.0.40[.0] 245 * 1.2.40rc01 13 10240 12.so.0.40[.0] 246 * 1.0.49 10 10049 10.so.0.49[.0] 247 * 1.2.40 13 10240 12.so.0.40[.0] 248 * 1.2.41beta01-18 13 10241 12.so.0.41[.0] 249 * 1.0.51rc01 10 10051 10.so.0.51[.0] 250 * 1.2.41rc01-03 13 10241 12.so.0.41[.0] 251 * 1.0.51 10 10051 10.so.0.51[.0] 252 * 1.2.41 13 10241 12.so.0.41[.0] 253 * 1.2.42beta01-02 13 10242 12.so.0.42[.0] 254 * 1.2.42rc01-05 13 10242 12.so.0.42[.0] 255 * 1.0.52 10 10052 10.so.0.52[.0] 256 * 1.2.42 13 10242 12.so.0.42[.0] 257 * 1.2.43beta01-05 13 10243 12.so.0.43[.0] 258 * 1.0.53rc01-02 10 10053 10.so.0.53[.0] 259 * 1.2.43rc01-02 13 10243 12.so.0.43[.0] 260 * 1.0.53 10 10053 10.so.0.53[.0] 261 * 1.2.43 13 10243 12.so.0.43[.0] 262 * 1.2.44beta01-03 13 10244 12.so.0.44[.0] 263 * 1.2.44rc01-03 13 10244 12.so.0.44[.0] 264 * 1.2.44 13 10244 12.so.0.44[.0] 265 * 266 * Henceforth the source version will match the shared-library major 267 * and minor numbers; the shared-library major version number will be 268 * used for changes in backward compatibility, as it is intended. The 269 * PNG_LIBPNG_VER macro, which is not used within libpng but is available 270 * for applications, is an unsigned integer of the form xyyzz corresponding 271 * to the source version x.y.z (leading zeros in y and z). Beta versions 272 * were given the previous public release number plus a letter, until 273 * version 1.0.6j; from then on they were given the upcoming public 274 * release number plus "betaNN" or "rcNN". 275 * 276 * Binary incompatibility exists only when applications make direct access 277 * to the info_ptr or png_ptr members through png.h, and the compiled 278 * application is loaded with a different version of the library. 279 * 280 * DLLNUM will change each time there are forward or backward changes 281 * in binary compatibility (e.g., when a new feature is added). 282 * 283 * See libpng.txt or libpng.3 for more information. The PNG specification 284 * is available as a W3C Recommendation and as an ISO Specification, 285 * <http://www.w3.org/TR/2003/REC-PNG-20031110/ 286 */ 287 288 /* 289 * COPYRIGHT NOTICE, DISCLAIMER, and LICENSE: 290 * 291 * If you modify libpng you may insert additional notices immediately following 292 * this sentence. 293 * 294 * This code is released under the libpng license. 295 * 296 * libpng versions 1.2.6, August 15, 2004, through 1.2.44, June 26, 2010, are 297 * Copyright (c) 2004, 2006-2010 Glenn Randers-Pehrson, and are 298 * distributed according to the same disclaimer and license as libpng-1.2.5 299 * with the following individual added to the list of Contributing Authors: 300 * 301 * Cosmin Truta 302 * 303 * libpng versions 1.0.7, July 1, 2000, through 1.2.5, October 3, 2002, are 304 * Copyright (c) 2000-2002 Glenn Randers-Pehrson, and are 305 * distributed according to the same disclaimer and license as libpng-1.0.6 306 * with the following individuals added to the list of Contributing Authors: 307 * 308 * Simon-Pierre Cadieux 309 * Eric S. Raymond 310 * Gilles Vollant 311 * 312 * and with the following additions to the disclaimer: 313 * 314 * There is no warranty against interference with your enjoyment of the 315 * library or against infringement. There is no warranty that our 316 * efforts or the library will fulfill any of your particular purposes 317 * or needs. This library is provided with all faults, and the entire 318 * risk of satisfactory quality, performance, accuracy, and effort is with 319 * the user. 320 * 321 * libpng versions 0.97, January 1998, through 1.0.6, March 20, 2000, are 322 * Copyright (c) 1998, 1999, 2000 Glenn Randers-Pehrson, and are 323 * distributed according to the same disclaimer and license as libpng-0.96, 324 * with the following individuals added to the list of Contributing Authors: 325 * 326 * Tom Lane 327 * Glenn Randers-Pehrson 328 * Willem van Schaik 329 * 330 * libpng versions 0.89, June 1996, through 0.96, May 1997, are 331 * Copyright (c) 1996, 1997 Andreas Dilger 332 * Distributed according to the same disclaimer and license as libpng-0.88, 333 * with the following individuals added to the list of Contributing Authors: 334 * 335 * John Bowler 336 * Kevin Bracey 337 * Sam Bushell 338 * Magnus Holmgren 339 * Greg Roelofs 340 * Tom Tanner 341 * 342 * libpng versions 0.5, May 1995, through 0.88, January 1996, are 343 * Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc. 344 * 345 * For the purposes of this copyright and license, "Contributing Authors" 346 * is defined as the following set of individuals: 347 * 348 * Andreas Dilger 349 * Dave Martindale 350 * Guy Eric Schalnat 351 * Paul Schmidt 352 * Tim Wegner 353 * 354 * The PNG Reference Library is supplied "AS IS". The Contributing Authors 355 * and Group 42, Inc. disclaim all warranties, expressed or implied, 356 * including, without limitation, the warranties of merchantability and of 357 * fitness for any purpose. The Contributing Authors and Group 42, Inc. 358 * assume no liability for direct, indirect, incidental, special, exemplary, 359 * or consequential damages, which may result from the use of the PNG 360 * Reference Library, even if advised of the possibility of such damage. 361 * 362 * Permission is hereby granted to use, copy, modify, and distribute this 363 * source code, or portions hereof, for any purpose, without fee, subject 364 * to the following restrictions: 365 * 366 * 1. The origin of this source code must not be misrepresented. 367 * 368 * 2. Altered versions must be plainly marked as such and 369 * must not be misrepresented as being the original source. 370 * 371 * 3. This Copyright notice may not be removed or altered from 372 * any source or altered source distribution. 373 * 374 * The Contributing Authors and Group 42, Inc. specifically permit, without 375 * fee, and encourage the use of this source code as a component to 376 * supporting the PNG file format in commercial products. If you use this 377 * source code in a product, acknowledgment is not required but would be 378 * appreciated. 379 */ 380 381 /* 382 * A "png_get_copyright" function is available, for convenient use in "about" 383 * boxes and the like: 384 * 385 * printf("%s",png_get_copyright(NULL)); 386 * 387 * Also, the PNG logo (in PNG format, of course) is supplied in the 388 * files "pngbar.png" and "pngbar.jpg (88x31) and "pngnow.png" (98x31). 389 */ 390 391 /* 392 * Libpng is OSI Certified Open Source Software. OSI Certified is a 393 * certification mark of the Open Source Initiative. 394 */ 395 396 /* 397 * The contributing authors would like to thank all those who helped 398 * with testing, bug fixes, and patience. This wouldn't have been 399 * possible without all of you. 400 * 401 * Thanks to Frank J. T. Wojcik for helping with the documentation. 402 */ 403 404 /* 405 * Y2K compliance in libpng: 406 * ========================= 407 * 408 * June 26, 2010 409 * 410 * Since the PNG Development group is an ad-hoc body, we can't make 411 * an official declaration. 412 * 413 * This is your unofficial assurance that libpng from version 0.71 and 414 * upward through 1.2.44 are Y2K compliant. It is my belief that earlier 415 * versions were also Y2K compliant. 416 * 417 * Libpng only has three year fields. One is a 2-byte unsigned integer 418 * that will hold years up to 65535. The other two hold the date in text 419 * format, and will hold years up to 9999. 420 * 421 * The integer is 422 * "png_uint_16 year" in png_time_struct. 423 * 424 * The strings are 425 * "png_charp time_buffer" in png_struct and 426 * "near_time_buffer", which is a local character string in png.c. 427 * 428 * There are seven time-related functions: 429 * png.c: png_convert_to_rfc_1123() in png.c 430 * (formerly png_convert_to_rfc_1152() in error) 431 * png_convert_from_struct_tm() in pngwrite.c, called in pngwrite.c 432 * png_convert_from_time_t() in pngwrite.c 433 * png_get_tIME() in pngget.c 434 * png_handle_tIME() in pngrutil.c, called in pngread.c 435 * png_set_tIME() in pngset.c 436 * png_write_tIME() in pngwutil.c, called in pngwrite.c 437 * 438 * All handle dates properly in a Y2K environment. The 439 * png_convert_from_time_t() function calls gmtime() to convert from system 440 * clock time, which returns (year - 1900), which we properly convert to 441 * the full 4-digit year. There is a possibility that applications using 442 * libpng are not passing 4-digit years into the png_convert_to_rfc_1123() 443 * function, or that they are incorrectly passing only a 2-digit year 444 * instead of "year - 1900" into the png_convert_from_struct_tm() function, 445 * but this is not under our control. The libpng documentation has always 446 * stated that it works with 4-digit years, and the APIs have been 447 * documented as such. 448 * 449 * The tIME chunk itself is also Y2K compliant. It uses a 2-byte unsigned 450 * integer to hold the year, and can hold years as large as 65535. 451 * 452 * zlib, upon which libpng depends, is also Y2K compliant. It contains 453 * no date-related code. 454 * 455 * Glenn Randers-Pehrson 456 * libpng maintainer 457 * PNG Development Group 458 */ 459 460 #ifndef PNG_H 461 #define PNG_H 462 463 /* This is not the place to learn how to use libpng. The file libpng.txt 464 * describes how to use libpng, and the file example.c summarizes it 465 * with some code on which to build. This file is useful for looking 466 * at the actual function definitions and structure components. 467 */ 468 469 /* Version information for png.h - this should match the version in png.c */ 470 #define PNG_LIBPNG_VER_STRING "1.2.44" 471 #define PNG_HEADER_VERSION_STRING \ 472 " libpng version 1.2.44 - June 26, 2010\n" 473 474 #define PNG_LIBPNG_VER_SONUM 0 475 #define PNG_LIBPNG_VER_DLLNUM 13 476 477 /* These should match the first 3 components of PNG_LIBPNG_VER_STRING: */ 478 #define PNG_LIBPNG_VER_MAJOR 1 479 #define PNG_LIBPNG_VER_MINOR 2 480 #define PNG_LIBPNG_VER_RELEASE 44 481 /* This should match the numeric part of the final component of 482 * PNG_LIBPNG_VER_STRING, omitting any leading zero: 483 */ 484 485 #define PNG_LIBPNG_VER_BUILD 0 486 487 /* Release Status */ 488 #define PNG_LIBPNG_BUILD_ALPHA 1 489 #define PNG_LIBPNG_BUILD_BETA 2 490 #define PNG_LIBPNG_BUILD_RC 3 491 #define PNG_LIBPNG_BUILD_STABLE 4 492 #define PNG_LIBPNG_BUILD_RELEASE_STATUS_MASK 7 493 494 /* Release-Specific Flags */ 495 #define PNG_LIBPNG_BUILD_PATCH 8 /* Can be OR'ed with 496 PNG_LIBPNG_BUILD_STABLE only */ 497 #define PNG_LIBPNG_BUILD_PRIVATE 16 /* Cannot be OR'ed with 498 PNG_LIBPNG_BUILD_SPECIAL */ 499 #define PNG_LIBPNG_BUILD_SPECIAL 32 /* Cannot be OR'ed with 500 PNG_LIBPNG_BUILD_PRIVATE */ 501 502 #define PNG_LIBPNG_BUILD_BASE_TYPE PNG_LIBPNG_BUILD_STABLE 503 504 /* Careful here. At one time, Guy wanted to use 082, but that would be octal. 505 * We must not include leading zeros. 506 * Versions 0.7 through 1.0.0 were in the range 0 to 100 here (only 507 * version 1.0.0 was mis-numbered 100 instead of 10000). From 508 * version 1.0.1 it's xxyyzz, where x=major, y=minor, z=release 509 */ 510 #define PNG_LIBPNG_VER 10244 /* 1.2.44 */ 511 512 #ifndef PNG_VERSION_INFO_ONLY 513 /* Include the compression library's header */ 514 #include "zlib.h" 515 #endif 516 517 /* Include all user configurable info, including optional assembler routines */ 518 #include "pngconf.h" 519 520 /* 521 * Added at libpng-1.2.8 */ 522 /* Ref MSDN: Private as priority over Special 523 * VS_FF_PRIVATEBUILD File *was not* built using standard release 524 * procedures. If this value is given, the StringFileInfo block must 525 * contain a PrivateBuild string. 526 * 527 * VS_FF_SPECIALBUILD File *was* built by the original company using 528 * standard release procedures but is a variation of the standard 529 * file of the same version number. If this value is given, the 530 * StringFileInfo block must contain a SpecialBuild string. 531 */ 532 533 #ifdef PNG_USER_PRIVATEBUILD 534 # define PNG_LIBPNG_BUILD_TYPE \ 535 (PNG_LIBPNG_BUILD_BASE_TYPE | PNG_LIBPNG_BUILD_PRIVATE) 536 #else 537 # ifdef PNG_LIBPNG_SPECIALBUILD 538 # define PNG_LIBPNG_BUILD_TYPE \ 539 (PNG_LIBPNG_BUILD_BASE_TYPE | PNG_LIBPNG_BUILD_SPECIAL) 540 # else 541 # define PNG_LIBPNG_BUILD_TYPE (PNG_LIBPNG_BUILD_BASE_TYPE) 542 # endif 543 #endif 544 545 #ifndef PNG_VERSION_INFO_ONLY 546 547 /* Inhibit C++ name-mangling for libpng functions but not for system calls. */ 548 #ifdef __cplusplus 549 extern "C" { 550 #endif /* __cplusplus */ 551 552 /* This file is arranged in several sections. The first section contains 553 * structure and type definitions. The second section contains the external 554 * library functions, while the third has the internal library functions, 555 * which applications aren't expected to use directly. 556 */ 557 558 #ifndef PNG_NO_TYPECAST_NULL 559 #define int_p_NULL (int *)NULL 560 #define png_bytep_NULL (png_bytep)NULL 561 #define png_bytepp_NULL (png_bytepp)NULL 562 #define png_doublep_NULL (png_doublep)NULL 563 #define png_error_ptr_NULL (png_error_ptr)NULL 564 #define png_flush_ptr_NULL (png_flush_ptr)NULL 565 #define png_free_ptr_NULL (png_free_ptr)NULL 566 #define png_infopp_NULL (png_infopp)NULL 567 #define png_malloc_ptr_NULL (png_malloc_ptr)NULL 568 #define png_read_status_ptr_NULL (png_read_status_ptr)NULL 569 #define png_rw_ptr_NULL (png_rw_ptr)NULL 570 #define png_structp_NULL (png_structp)NULL 571 #define png_uint_16p_NULL (png_uint_16p)NULL 572 #define png_voidp_NULL (png_voidp)NULL 573 #define png_write_status_ptr_NULL (png_write_status_ptr)NULL 574 #else 575 #define int_p_NULL NULL 576 #define png_bytep_NULL NULL 577 #define png_bytepp_NULL NULL 578 #define png_doublep_NULL NULL 579 #define png_error_ptr_NULL NULL 580 #define png_flush_ptr_NULL NULL 581 #define png_free_ptr_NULL NULL 582 #define png_infopp_NULL NULL 583 #define png_malloc_ptr_NULL NULL 584 #define png_read_status_ptr_NULL NULL 585 #define png_rw_ptr_NULL NULL 586 #define png_structp_NULL NULL 587 #define png_uint_16p_NULL NULL 588 #define png_voidp_NULL NULL 589 #define png_write_status_ptr_NULL NULL 590 #endif 591 592 /* Variables declared in png.c - only it needs to define PNG_NO_EXTERN */ 593 #if !defined(PNG_NO_EXTERN) || defined(PNG_ALWAYS_EXTERN) 594 /* Version information for C files, stored in png.c. This had better match 595 * the version above. 596 */ 597 #ifdef PNG_USE_GLOBAL_ARRAYS 598 PNG_EXPORT_VAR (PNG_CONST char) png_libpng_ver[18]; 599 /* Need room for 99.99.99beta99z */ 600 #else 601 #define png_libpng_ver png_get_header_ver(NULL) 602 #endif 603 604 #ifdef PNG_USE_GLOBAL_ARRAYS 605 /* This was removed in version 1.0.5c */ 606 /* Structures to facilitate easy interlacing. See png.c for more details */ 607 PNG_EXPORT_VAR (PNG_CONST int FARDATA) png_pass_start[7]; 608 PNG_EXPORT_VAR (PNG_CONST int FARDATA) png_pass_inc[7]; 609 PNG_EXPORT_VAR (PNG_CONST int FARDATA) png_pass_ystart[7]; 610 PNG_EXPORT_VAR (PNG_CONST int FARDATA) png_pass_yinc[7]; 611 PNG_EXPORT_VAR (PNG_CONST int FARDATA) png_pass_mask[7]; 612 PNG_EXPORT_VAR (PNG_CONST int FARDATA) png_pass_dsp_mask[7]; 613 /* This isn't currently used. If you need it, see png.c for more details. 614 PNG_EXPORT_VAR (PNG_CONST int FARDATA) png_pass_height[7]; 615 */ 616 #endif 617 618 #endif /* PNG_NO_EXTERN */ 619 620 /* Three color definitions. The order of the red, green, and blue, (and the 621 * exact size) is not important, although the size of the fields need to 622 * be png_byte or png_uint_16 (as defined below). 623 */ 624 typedef struct png_color_struct 625 { 626 png_byte red; 627 png_byte green; 628 png_byte blue; 629 } png_color; 630 typedef png_color FAR * png_colorp; 631 typedef png_color FAR * FAR * png_colorpp; 632 633 typedef struct png_color_16_struct 634 { 635 png_byte index; /* used for palette files */ 636 png_uint_16 red; /* for use in red green blue files */ 637 png_uint_16 green; 638 png_uint_16 blue; 639 png_uint_16 gray; /* for use in grayscale files */ 640 } png_color_16; 641 typedef png_color_16 FAR * png_color_16p; 642 typedef png_color_16 FAR * FAR * png_color_16pp; 643 644 typedef struct png_color_8_struct 645 { 646 png_byte red; /* for use in red green blue files */ 647 png_byte green; 648 png_byte blue; 649 png_byte gray; /* for use in grayscale files */ 650 png_byte alpha; /* for alpha channel files */ 651 } png_color_8; 652 typedef png_color_8 FAR * png_color_8p; 653 typedef png_color_8 FAR * FAR * png_color_8pp; 654 655 /* 656 * The following two structures are used for the in-core representation 657 * of sPLT chunks. 658 */ 659 typedef struct png_sPLT_entry_struct 660 { 661 png_uint_16 red; 662 png_uint_16 green; 663 png_uint_16 blue; 664 png_uint_16 alpha; 665 png_uint_16 frequency; 666 } png_sPLT_entry; 667 typedef png_sPLT_entry FAR * png_sPLT_entryp; 668 typedef png_sPLT_entry FAR * FAR * png_sPLT_entrypp; 669 670 /* When the depth of the sPLT palette is 8 bits, the color and alpha samples 671 * occupy the LSB of their respective members, and the MSB of each member 672 * is zero-filled. The frequency member always occupies the full 16 bits. 673 */ 674 675 typedef struct png_sPLT_struct 676 { 677 png_charp name; /* palette name */ 678 png_byte depth; /* depth of palette samples */ 679 png_sPLT_entryp entries; /* palette entries */ 680 png_int_32 nentries; /* number of palette entries */ 681 } png_sPLT_t; 682 typedef png_sPLT_t FAR * png_sPLT_tp; 683 typedef png_sPLT_t FAR * FAR * png_sPLT_tpp; 684 685 #ifdef PNG_TEXT_SUPPORTED 686 /* png_text holds the contents of a text/ztxt/itxt chunk in a PNG file, 687 * and whether that contents is compressed or not. The "key" field 688 * points to a regular zero-terminated C string. The "text", "lang", and 689 * "lang_key" fields can be regular C strings, empty strings, or NULL pointers. 690 * However, the * structure returned by png_get_text() will always contain 691 * regular zero-terminated C strings (possibly empty), never NULL pointers, 692 * so they can be safely used in printf() and other string-handling functions. 693 */ 694 typedef struct png_text_struct 695 { 696 int compression; /* compression value: 697 -1: tEXt, none 698 0: zTXt, deflate 699 1: iTXt, none 700 2: iTXt, deflate */ 701 png_charp key; /* keyword, 1-79 character description of "text" */ 702 png_charp text; /* comment, may be an empty string (ie "") 703 or a NULL pointer */ 704 png_size_t text_length; /* length of the text string */ 705 #ifdef PNG_iTXt_SUPPORTED 706 png_size_t itxt_length; /* length of the itxt string */ 707 png_charp lang; /* language code, 0-79 characters 708 or a NULL pointer */ 709 png_charp lang_key; /* keyword translated UTF-8 string, 0 or more 710 chars or a NULL pointer */ 711 #endif 712 } png_text; 713 typedef png_text FAR * png_textp; 714 typedef png_text FAR * FAR * png_textpp; 715 #endif 716 717 /* Supported compression types for text in PNG files (tEXt, and zTXt). 718 * The values of the PNG_TEXT_COMPRESSION_ defines should NOT be changed. 719 */ 720 #define PNG_TEXT_COMPRESSION_NONE_WR -3 721 #define PNG_TEXT_COMPRESSION_zTXt_WR -2 722 #define PNG_TEXT_COMPRESSION_NONE -1 723 #define PNG_TEXT_COMPRESSION_zTXt 0 724 #define PNG_ITXT_COMPRESSION_NONE 1 725 #define PNG_ITXT_COMPRESSION_zTXt 2 726 #define PNG_TEXT_COMPRESSION_LAST 3 /* Not a valid value */ 727 728 /* png_time is a way to hold the time in an machine independent way. 729 * Two conversions are provided, both from time_t and struct tm. There 730 * is no portable way to convert to either of these structures, as far 731 * as I know. If you know of a portable way, send it to me. As a side 732 * note - PNG has always been Year 2000 compliant! 733 */ 734 typedef struct png_time_struct 735 { 736 png_uint_16 year; /* full year, as in, 1995 */ 737 png_byte month; /* month of year, 1 - 12 */ 738 png_byte day; /* day of month, 1 - 31 */ 739 png_byte hour; /* hour of day, 0 - 23 */ 740 png_byte minute; /* minute of hour, 0 - 59 */ 741 png_byte second; /* second of minute, 0 - 60 (for leap seconds) */ 742 } png_time; 743 typedef png_time FAR * png_timep; 744 typedef png_time FAR * FAR * png_timepp; 745 746 #if defined(PNG_UNKNOWN_CHUNKS_SUPPORTED) || \ 747 defined(PNG_HANDLE_AS_UNKNOWN_SUPPORTED) 748 /* png_unknown_chunk is a structure to hold queued chunks for which there is 749 * no specific support. The idea is that we can use this to queue 750 * up private chunks for output even though the library doesn't actually 751 * know about their semantics. 752 */ 753 #define PNG_CHUNK_NAME_LENGTH 5 754 typedef struct png_unknown_chunk_t 755 { 756 png_byte name[PNG_CHUNK_NAME_LENGTH]; 757 png_byte *data; 758 png_size_t size; 759 760 /* libpng-using applications should NOT directly modify this byte. */ 761 png_byte location; /* mode of operation at read time */ 762 } 763 png_unknown_chunk; 764 typedef png_unknown_chunk FAR * png_unknown_chunkp; 765 typedef png_unknown_chunk FAR * FAR * png_unknown_chunkpp; 766 #endif 767 768 #ifdef PNG_INDEX_SUPPORTED 769 /* png_line_index_struct records an index point, where we impose an index point 770 * to be located at the beginning of a line for simplifying the implementation. 771 */ 772 typedef struct png_line_index_struct 773 { 774 // state of the lz decoder 775 z_streamp z_state; 776 777 // the IDAT header position of the chunk, which the index point is in 778 png_uint_32 stream_idat_position; 779 780 // we intend to record the offset of the index point in the chunk, 781 // but we record the number of remaining bytes in the chunk after the 782 // index point. That's because PNG processes a chunk this way. 783 png_uint_32 bytes_left_in_idat; 784 785 // decompressed data of the previous row 786 png_bytep prev_row; 787 } png_line_index; 788 typedef png_line_index FAR * png_line_indexp; 789 790 typedef struct png_index_struct 791 { 792 // A temporary variable used when we build the index. The variable records 793 // the IDAT header position of the last chunk read in so far. 794 png_uint_32 stream_idat_position; 795 796 // line index information about each passes 797 798 // the number of index points in each pass 799 png_uint_32 size[7]; 800 801 // the line span of two index points of each pass 802 png_uint_32 step[7]; 803 804 // the index points of each pass 805 png_line_indexp *pass_line_index[7]; 806 } png_index; 807 typedef png_index FAR * png_indexp; 808 809 #define INDEX_SAMPLE_SIZE 254 810 #endif 811 812 /* png_info is a structure that holds the information in a PNG file so 813 * that the application can find out the characteristics of the image. 814 * If you are reading the file, this structure will tell you what is 815 * in the PNG file. If you are writing the file, fill in the information 816 * you want to put into the PNG file, then call png_write_info(). 817 * The names chosen should be very close to the PNG specification, so 818 * consult that document for information about the meaning of each field. 819 * 820 * With libpng < 0.95, it was only possible to directly set and read the 821 * the values in the png_info_struct, which meant that the contents and 822 * order of the values had to remain fixed. With libpng 0.95 and later, 823 * however, there are now functions that abstract the contents of 824 * png_info_struct from the application, so this makes it easier to use 825 * libpng with dynamic libraries, and even makes it possible to use 826 * libraries that don't have all of the libpng ancillary chunk-handing 827 * functionality. 828 * 829 * In any case, the order of the parameters in png_info_struct should NOT 830 * be changed for as long as possible to keep compatibility with applications 831 * that use the old direct-access method with png_info_struct. 832 * 833 * The following members may have allocated storage attached that should be 834 * cleaned up before the structure is discarded: palette, trans, text, 835 * pcal_purpose, pcal_units, pcal_params, hist, iccp_name, iccp_profile, 836 * splt_palettes, scal_unit, row_pointers, and unknowns. By default, these 837 * are automatically freed when the info structure is deallocated, if they were 838 * allocated internally by libpng. This behavior can be changed by means 839 * of the png_data_freer() function. 840 * 841 * More allocation details: all the chunk-reading functions that 842 * change these members go through the corresponding png_set_* 843 * functions. A function to clear these members is available: see 844 * png_free_data(). The png_set_* functions do not depend on being 845 * able to point info structure members to any of the storage they are 846 * passed (they make their own copies), EXCEPT that the png_set_text 847 * functions use the same storage passed to them in the text_ptr or 848 * itxt_ptr structure argument, and the png_set_rows and png_set_unknowns 849 * functions do not make their own copies. 850 */ 851 typedef struct png_info_struct 852 { 853 /* The following are necessary for every PNG file */ 854 png_uint_32 width PNG_DEPSTRUCT; /* width of image in pixels (from IHDR) */ 855 png_uint_32 height PNG_DEPSTRUCT; /* height of image in pixels (from IHDR) */ 856 png_uint_32 valid PNG_DEPSTRUCT; /* valid chunk data (see PNG_INFO_ below) */ 857 png_uint_32 rowbytes PNG_DEPSTRUCT; /* bytes needed to hold an untransformed row */ 858 png_colorp palette PNG_DEPSTRUCT; /* array of color values (valid & PNG_INFO_PLTE) */ 859 png_uint_16 num_palette PNG_DEPSTRUCT; /* number of color entries in "palette" (PLTE) */ 860 png_uint_16 num_trans PNG_DEPSTRUCT; /* number of transparent palette color (tRNS) */ 861 png_byte bit_depth PNG_DEPSTRUCT; /* 1, 2, 4, 8, or 16 bits/channel (from IHDR) */ 862 png_byte color_type PNG_DEPSTRUCT; /* see PNG_COLOR_TYPE_ below (from IHDR) */ 863 /* The following three should have been named *_method not *_type */ 864 png_byte compression_type PNG_DEPSTRUCT; /* must be PNG_COMPRESSION_TYPE_BASE (IHDR) */ 865 png_byte filter_type PNG_DEPSTRUCT; /* must be PNG_FILTER_TYPE_BASE (from IHDR) */ 866 png_byte interlace_type PNG_DEPSTRUCT; /* One of PNG_INTERLACE_NONE, PNG_INTERLACE_ADAM7 */ 867 868 /* The following is informational only on read, and not used on writes. */ 869 png_byte channels PNG_DEPSTRUCT; /* number of data channels per pixel (1, 2, 3, 4) */ 870 png_byte pixel_depth PNG_DEPSTRUCT; /* number of bits per pixel */ 871 png_byte spare_byte PNG_DEPSTRUCT; /* to align the data, and for future use */ 872 png_byte signature[8] PNG_DEPSTRUCT; /* magic bytes read by libpng from start of file */ 873 874 /* The rest of the data is optional. If you are reading, check the 875 * valid field to see if the information in these are valid. If you 876 * are writing, set the valid field to those chunks you want written, 877 * and initialize the appropriate fields below. 878 */ 879 880 #if defined(PNG_gAMA_SUPPORTED) && defined(PNG_FLOATING_POINT_SUPPORTED) 881 /* The gAMA chunk describes the gamma characteristics of the system 882 * on which the image was created, normally in the range [1.0, 2.5]. 883 * Data is valid if (valid & PNG_INFO_gAMA) is non-zero. 884 */ 885 float gamma PNG_DEPSTRUCT; /* gamma value of image, if (valid & PNG_INFO_gAMA) */ 886 #endif 887 888 #ifdef PNG_sRGB_SUPPORTED 889 /* GR-P, 0.96a */ 890 /* Data valid if (valid & PNG_INFO_sRGB) non-zero. */ 891 png_byte srgb_intent PNG_DEPSTRUCT; /* sRGB rendering intent [0, 1, 2, or 3] */ 892 #endif 893 894 #ifdef PNG_TEXT_SUPPORTED 895 /* The tEXt, and zTXt chunks contain human-readable textual data in 896 * uncompressed, compressed, and optionally compressed forms, respectively. 897 * The data in "text" is an array of pointers to uncompressed, 898 * null-terminated C strings. Each chunk has a keyword that describes the 899 * textual data contained in that chunk. Keywords are not required to be 900 * unique, and the text string may be empty. Any number of text chunks may 901 * be in an image. 902 */ 903 int num_text PNG_DEPSTRUCT; /* number of comments read/to write */ 904 int max_text PNG_DEPSTRUCT; /* current size of text array */ 905 png_textp text PNG_DEPSTRUCT; /* array of comments read/to write */ 906 #endif /* PNG_TEXT_SUPPORTED */ 907 908 #ifdef PNG_tIME_SUPPORTED 909 /* The tIME chunk holds the last time the displayed image data was 910 * modified. See the png_time struct for the contents of this struct. 911 */ 912 png_time mod_time PNG_DEPSTRUCT; 913 #endif 914 915 #ifdef PNG_sBIT_SUPPORTED 916 /* The sBIT chunk specifies the number of significant high-order bits 917 * in the pixel data. Values are in the range [1, bit_depth], and are 918 * only specified for the channels in the pixel data. The contents of 919 * the low-order bits is not specified. Data is valid if 920 * (valid & PNG_INFO_sBIT) is non-zero. 921 */ 922 png_color_8 sig_bit PNG_DEPSTRUCT; /* significant bits in color channels */ 923 #endif 924 925 #if defined(PNG_tRNS_SUPPORTED) || defined(PNG_READ_EXPAND_SUPPORTED) || \ 926 defined(PNG_READ_BACKGROUND_SUPPORTED) 927 /* The tRNS chunk supplies transparency data for paletted images and 928 * other image types that don't need a full alpha channel. There are 929 * "num_trans" transparency values for a paletted image, stored in the 930 * same order as the palette colors, starting from index 0. Values 931 * for the data are in the range [0, 255], ranging from fully transparent 932 * to fully opaque, respectively. For non-paletted images, there is a 933 * single color specified that should be treated as fully transparent. 934 * Data is valid if (valid & PNG_INFO_tRNS) is non-zero. 935 */ 936 png_bytep trans PNG_DEPSTRUCT; /* transparent values for paletted image */ 937 png_color_16 trans_values PNG_DEPSTRUCT; /* transparent color for non-palette image */ 938 #endif 939 940 #if defined(PNG_bKGD_SUPPORTED) || defined(PNG_READ_BACKGROUND_SUPPORTED) 941 /* The bKGD chunk gives the suggested image background color if the 942 * display program does not have its own background color and the image 943 * is needs to composited onto a background before display. The colors 944 * in "background" are normally in the same color space/depth as the 945 * pixel data. Data is valid if (valid & PNG_INFO_bKGD) is non-zero. 946 */ 947 png_color_16 background PNG_DEPSTRUCT; 948 #endif 949 950 #ifdef PNG_oFFs_SUPPORTED 951 /* The oFFs chunk gives the offset in "offset_unit_type" units rightwards 952 * and downwards from the top-left corner of the display, page, or other 953 * application-specific co-ordinate space. See the PNG_OFFSET_ defines 954 * below for the unit types. Valid if (valid & PNG_INFO_oFFs) non-zero. 955 */ 956 png_int_32 x_offset PNG_DEPSTRUCT; /* x offset on page */ 957 png_int_32 y_offset PNG_DEPSTRUCT; /* y offset on page */ 958 png_byte offset_unit_type PNG_DEPSTRUCT; /* offset units type */ 959 #endif 960 961 #ifdef PNG_pHYs_SUPPORTED 962 /* The pHYs chunk gives the physical pixel density of the image for 963 * display or printing in "phys_unit_type" units (see PNG_RESOLUTION_ 964 * defines below). Data is valid if (valid & PNG_INFO_pHYs) is non-zero. 965 */ 966 png_uint_32 x_pixels_per_unit PNG_DEPSTRUCT; /* horizontal pixel density */ 967 png_uint_32 y_pixels_per_unit PNG_DEPSTRUCT; /* vertical pixel density */ 968 png_byte phys_unit_type PNG_DEPSTRUCT; /* resolution type (see PNG_RESOLUTION_ below) */ 969 #endif 970 971 #ifdef PNG_hIST_SUPPORTED 972 /* The hIST chunk contains the relative frequency or importance of the 973 * various palette entries, so that a viewer can intelligently select a 974 * reduced-color palette, if required. Data is an array of "num_palette" 975 * values in the range [0,65535]. Data valid if (valid & PNG_INFO_hIST) 976 * is non-zero. 977 */ 978 png_uint_16p hist PNG_DEPSTRUCT; 979 #endif 980 981 #ifdef PNG_cHRM_SUPPORTED 982 /* The cHRM chunk describes the CIE color characteristics of the monitor 983 * on which the PNG was created. This data allows the viewer to do gamut 984 * mapping of the input image to ensure that the viewer sees the same 985 * colors in the image as the creator. Values are in the range 986 * [0.0, 0.8]. Data valid if (valid & PNG_INFO_cHRM) non-zero. 987 */ 988 #ifdef PNG_FLOATING_POINT_SUPPORTED 989 float x_white PNG_DEPSTRUCT; 990 float y_white PNG_DEPSTRUCT; 991 float x_red PNG_DEPSTRUCT; 992 float y_red PNG_DEPSTRUCT; 993 float x_green PNG_DEPSTRUCT; 994 float y_green PNG_DEPSTRUCT; 995 float x_blue PNG_DEPSTRUCT; 996 float y_blue PNG_DEPSTRUCT; 997 #endif 998 #endif 999 1000 #ifdef PNG_pCAL_SUPPORTED 1001 /* The pCAL chunk describes a transformation between the stored pixel 1002 * values and original physical data values used to create the image. 1003 * The integer range [0, 2^bit_depth - 1] maps to the floating-point 1004 * range given by [pcal_X0, pcal_X1], and are further transformed by a 1005 * (possibly non-linear) transformation function given by "pcal_type" 1006 * and "pcal_params" into "pcal_units". Please see the PNG_EQUATION_ 1007 * defines below, and the PNG-Group's PNG extensions document for a 1008 * complete description of the transformations and how they should be 1009 * implemented, and for a description of the ASCII parameter strings. 1010 * Data values are valid if (valid & PNG_INFO_pCAL) non-zero. 1011 */ 1012 png_charp pcal_purpose PNG_DEPSTRUCT; /* pCAL chunk description string */ 1013 png_int_32 pcal_X0 PNG_DEPSTRUCT; /* minimum value */ 1014 png_int_32 pcal_X1 PNG_DEPSTRUCT; /* maximum value */ 1015 png_charp pcal_units PNG_DEPSTRUCT; /* Latin-1 string giving physical units */ 1016 png_charpp pcal_params PNG_DEPSTRUCT; /* ASCII strings containing parameter values */ 1017 png_byte pcal_type PNG_DEPSTRUCT; /* equation type (see PNG_EQUATION_ below) */ 1018 png_byte pcal_nparams PNG_DEPSTRUCT; /* number of parameters given in pcal_params */ 1019 #endif 1020 1021 /* New members added in libpng-1.0.6 */ 1022 #ifdef PNG_FREE_ME_SUPPORTED 1023 png_uint_32 free_me PNG_DEPSTRUCT; /* flags items libpng is responsible for freeing */ 1024 #endif 1025 1026 #if defined(PNG_UNKNOWN_CHUNKS_SUPPORTED) || \ 1027 defined(PNG_HANDLE_AS_UNKNOWN_SUPPORTED) 1028 /* Storage for unknown chunks that the library doesn't recognize. */ 1029 png_unknown_chunkp unknown_chunks PNG_DEPSTRUCT; 1030 png_size_t unknown_chunks_num PNG_DEPSTRUCT; 1031 #endif 1032 1033 #ifdef PNG_iCCP_SUPPORTED 1034 /* iCCP chunk data. */ 1035 png_charp iccp_name PNG_DEPSTRUCT; /* profile name */ 1036 png_charp iccp_profile PNG_DEPSTRUCT; /* International Color Consortium profile data */ 1037 /* Note to maintainer: should be png_bytep */ 1038 png_uint_32 iccp_proflen PNG_DEPSTRUCT; /* ICC profile data length */ 1039 png_byte iccp_compression PNG_DEPSTRUCT; /* Always zero */ 1040 #endif 1041 1042 #ifdef PNG_sPLT_SUPPORTED 1043 /* Data on sPLT chunks (there may be more than one). */ 1044 png_sPLT_tp splt_palettes PNG_DEPSTRUCT; 1045 png_uint_32 splt_palettes_num PNG_DEPSTRUCT; 1046 #endif 1047 1048 #ifdef PNG_sCAL_SUPPORTED 1049 /* The sCAL chunk describes the actual physical dimensions of the 1050 * subject matter of the graphic. The chunk contains a unit specification 1051 * a byte value, and two ASCII strings representing floating-point 1052 * values. The values are width and height corresponsing to one pixel 1053 * in the image. This external representation is converted to double 1054 * here. Data values are valid if (valid & PNG_INFO_sCAL) is non-zero. 1055 */ 1056 png_byte scal_unit PNG_DEPSTRUCT; /* unit of physical scale */ 1057 #ifdef PNG_FLOATING_POINT_SUPPORTED 1058 double scal_pixel_width PNG_DEPSTRUCT; /* width of one pixel */ 1059 double scal_pixel_height PNG_DEPSTRUCT; /* height of one pixel */ 1060 #endif 1061 #ifdef PNG_FIXED_POINT_SUPPORTED 1062 png_charp scal_s_width PNG_DEPSTRUCT; /* string containing height */ 1063 png_charp scal_s_height PNG_DEPSTRUCT; /* string containing width */ 1064 #endif 1065 #endif 1066 1067 #ifdef PNG_INFO_IMAGE_SUPPORTED 1068 /* Memory has been allocated if (valid & PNG_ALLOCATED_INFO_ROWS) non-zero */ 1069 /* Data valid if (valid & PNG_INFO_IDAT) non-zero */ 1070 png_bytepp row_pointers PNG_DEPSTRUCT; /* the image bits */ 1071 #endif 1072 1073 #if defined(PNG_FIXED_POINT_SUPPORTED) && defined(PNG_gAMA_SUPPORTED) 1074 png_fixed_point int_gamma PNG_DEPSTRUCT; /* gamma of image, if (valid & PNG_INFO_gAMA) */ 1075 #endif 1076 1077 #if defined(PNG_cHRM_SUPPORTED) && defined(PNG_FIXED_POINT_SUPPORTED) 1078 png_fixed_point int_x_white PNG_DEPSTRUCT; 1079 png_fixed_point int_y_white PNG_DEPSTRUCT; 1080 png_fixed_point int_x_red PNG_DEPSTRUCT; 1081 png_fixed_point int_y_red PNG_DEPSTRUCT; 1082 png_fixed_point int_x_green PNG_DEPSTRUCT; 1083 png_fixed_point int_y_green PNG_DEPSTRUCT; 1084 png_fixed_point int_x_blue PNG_DEPSTRUCT; 1085 png_fixed_point int_y_blue PNG_DEPSTRUCT; 1086 #endif 1087 1088 } png_info; 1089 1090 typedef png_info FAR * png_infop; 1091 typedef png_info FAR * FAR * png_infopp; 1092 1093 /* Maximum positive integer used in PNG is (2^31)-1 */ 1094 #define PNG_UINT_31_MAX ((png_uint_32)0x7fffffffL) 1095 #define PNG_UINT_32_MAX ((png_uint_32)(-1)) 1096 #define PNG_SIZE_MAX ((png_size_t)(-1)) 1097 #if defined(PNG_1_0_X) || defined (PNG_1_2_X) 1098 /* PNG_MAX_UINT is deprecated; use PNG_UINT_31_MAX instead. */ 1099 #define PNG_MAX_UINT PNG_UINT_31_MAX 1100 #endif 1101 1102 /* These describe the color_type field in png_info. */ 1103 /* color type masks */ 1104 #define PNG_COLOR_MASK_PALETTE 1 1105 #define PNG_COLOR_MASK_COLOR 2 1106 #define PNG_COLOR_MASK_ALPHA 4 1107 1108 /* color types. Note that not all combinations are legal */ 1109 #define PNG_COLOR_TYPE_GRAY 0 1110 #define PNG_COLOR_TYPE_PALETTE (PNG_COLOR_MASK_COLOR | PNG_COLOR_MASK_PALETTE) 1111 #define PNG_COLOR_TYPE_RGB (PNG_COLOR_MASK_COLOR) 1112 #define PNG_COLOR_TYPE_RGB_ALPHA (PNG_COLOR_MASK_COLOR | PNG_COLOR_MASK_ALPHA) 1113 #define PNG_COLOR_TYPE_GRAY_ALPHA (PNG_COLOR_MASK_ALPHA) 1114 /* aliases */ 1115 #define PNG_COLOR_TYPE_RGBA PNG_COLOR_TYPE_RGB_ALPHA 1116 #define PNG_COLOR_TYPE_GA PNG_COLOR_TYPE_GRAY_ALPHA 1117 1118 /* This is for compression type. PNG 1.0-1.2 only define the single type. */ 1119 #define PNG_COMPRESSION_TYPE_BASE 0 /* Deflate method 8, 32K window */ 1120 #define PNG_COMPRESSION_TYPE_DEFAULT PNG_COMPRESSION_TYPE_BASE 1121 1122 /* This is for filter type. PNG 1.0-1.2 only define the single type. */ 1123 #define PNG_FILTER_TYPE_BASE 0 /* Single row per-byte filtering */ 1124 #define PNG_INTRAPIXEL_DIFFERENCING 64 /* Used only in MNG datastreams */ 1125 #define PNG_FILTER_TYPE_DEFAULT PNG_FILTER_TYPE_BASE 1126 1127 /* These are for the interlacing type. These values should NOT be changed. */ 1128 #define PNG_INTERLACE_NONE 0 /* Non-interlaced image */ 1129 #define PNG_INTERLACE_ADAM7 1 /* Adam7 interlacing */ 1130 #define PNG_INTERLACE_LAST 2 /* Not a valid value */ 1131 1132 /* These are for the oFFs chunk. These values should NOT be changed. */ 1133 #define PNG_OFFSET_PIXEL 0 /* Offset in pixels */ 1134 #define PNG_OFFSET_MICROMETER 1 /* Offset in micrometers (1/10^6 meter) */ 1135 #define PNG_OFFSET_LAST 2 /* Not a valid value */ 1136 1137 /* These are for the pCAL chunk. These values should NOT be changed. */ 1138 #define PNG_EQUATION_LINEAR 0 /* Linear transformation */ 1139 #define PNG_EQUATION_BASE_E 1 /* Exponential base e transform */ 1140 #define PNG_EQUATION_ARBITRARY 2 /* Arbitrary base exponential transform */ 1141 #define PNG_EQUATION_HYPERBOLIC 3 /* Hyperbolic sine transformation */ 1142 #define PNG_EQUATION_LAST 4 /* Not a valid value */ 1143 1144 /* These are for the sCAL chunk. These values should NOT be changed. */ 1145 #define PNG_SCALE_UNKNOWN 0 /* unknown unit (image scale) */ 1146 #define PNG_SCALE_METER 1 /* meters per pixel */ 1147 #define PNG_SCALE_RADIAN 2 /* radians per pixel */ 1148 #define PNG_SCALE_LAST 3 /* Not a valid value */ 1149 1150 /* These are for the pHYs chunk. These values should NOT be changed. */ 1151 #define PNG_RESOLUTION_UNKNOWN 0 /* pixels/unknown unit (aspect ratio) */ 1152 #define PNG_RESOLUTION_METER 1 /* pixels/meter */ 1153 #define PNG_RESOLUTION_LAST 2 /* Not a valid value */ 1154 1155 /* These are for the sRGB chunk. These values should NOT be changed. */ 1156 #define PNG_sRGB_INTENT_PERCEPTUAL 0 1157 #define PNG_sRGB_INTENT_RELATIVE 1 1158 #define PNG_sRGB_INTENT_SATURATION 2 1159 #define PNG_sRGB_INTENT_ABSOLUTE 3 1160 #define PNG_sRGB_INTENT_LAST 4 /* Not a valid value */ 1161 1162 /* This is for text chunks */ 1163 #define PNG_KEYWORD_MAX_LENGTH 79 1164 1165 /* Maximum number of entries in PLTE/sPLT/tRNS arrays */ 1166 #define PNG_MAX_PALETTE_LENGTH 256 1167 1168 /* These determine if an ancillary chunk's data has been successfully read 1169 * from the PNG header, or if the application has filled in the corresponding 1170 * data in the info_struct to be written into the output file. The values 1171 * of the PNG_INFO_<chunk> defines should NOT be changed. 1172 */ 1173 #define PNG_INFO_gAMA 0x0001 1174 #define PNG_INFO_sBIT 0x0002 1175 #define PNG_INFO_cHRM 0x0004 1176 #define PNG_INFO_PLTE 0x0008 1177 #define PNG_INFO_tRNS 0x0010 1178 #define PNG_INFO_bKGD 0x0020 1179 #define PNG_INFO_hIST 0x0040 1180 #define PNG_INFO_pHYs 0x0080 1181 #define PNG_INFO_oFFs 0x0100 1182 #define PNG_INFO_tIME 0x0200 1183 #define PNG_INFO_pCAL 0x0400 1184 #define PNG_INFO_sRGB 0x0800 /* GR-P, 0.96a */ 1185 #define PNG_INFO_iCCP 0x1000 /* ESR, 1.0.6 */ 1186 #define PNG_INFO_sPLT 0x2000 /* ESR, 1.0.6 */ 1187 #define PNG_INFO_sCAL 0x4000 /* ESR, 1.0.6 */ 1188 #define PNG_INFO_IDAT 0x8000L /* ESR, 1.0.6 */ 1189 1190 /* This is used for the transformation routines, as some of them 1191 * change these values for the row. It also should enable using 1192 * the routines for other purposes. 1193 */ 1194 typedef struct png_row_info_struct 1195 { 1196 png_uint_32 width; /* width of row */ 1197 png_uint_32 rowbytes; /* number of bytes in row */ 1198 png_byte color_type; /* color type of row */ 1199 png_byte bit_depth; /* bit depth of row */ 1200 png_byte channels; /* number of channels (1, 2, 3, or 4) */ 1201 png_byte pixel_depth; /* bits per pixel (depth * channels) */ 1202 } png_row_info; 1203 1204 typedef png_row_info FAR * png_row_infop; 1205 typedef png_row_info FAR * FAR * png_row_infopp; 1206 1207 /* These are the function types for the I/O functions and for the functions 1208 * that allow the user to override the default I/O functions with his or her 1209 * own. The png_error_ptr type should match that of user-supplied warning 1210 * and error functions, while the png_rw_ptr type should match that of the 1211 * user read/write data functions. 1212 */ 1213 typedef struct png_struct_def png_struct; 1214 typedef png_struct FAR * png_structp; 1215 1216 typedef void (PNGAPI *png_error_ptr) PNGARG((png_structp, png_const_charp)); 1217 typedef void (PNGAPI *png_rw_ptr) PNGARG((png_structp, png_bytep, png_size_t)); 1218 #ifdef PNG_INDEX_SUPPORTED 1219 typedef void (PNGAPI *png_seek_ptr) PNGARG((png_structp, png_uint_32)); 1220 #endif 1221 typedef void (PNGAPI *png_flush_ptr) PNGARG((png_structp)); 1222 typedef void (PNGAPI *png_read_status_ptr) PNGARG((png_structp, png_uint_32, 1223 int)); 1224 typedef void (PNGAPI *png_write_status_ptr) PNGARG((png_structp, png_uint_32, 1225 int)); 1226 1227 #ifdef PNG_PROGRESSIVE_READ_SUPPORTED 1228 typedef void (PNGAPI *png_progressive_info_ptr) PNGARG((png_structp, png_infop)); 1229 typedef void (PNGAPI *png_progressive_end_ptr) PNGARG((png_structp, png_infop)); 1230 typedef void (PNGAPI *png_progressive_row_ptr) PNGARG((png_structp, png_bytep, 1231 png_uint_32, int)); 1232 #endif 1233 1234 #if defined(PNG_READ_USER_TRANSFORM_SUPPORTED) || \ 1235 defined(PNG_WRITE_USER_TRANSFORM_SUPPORTED) || \ 1236 defined(PNG_LEGACY_SUPPORTED) 1237 typedef void (PNGAPI *png_user_transform_ptr) PNGARG((png_structp, 1238 png_row_infop, png_bytep)); 1239 #endif 1240 1241 #ifdef PNG_USER_CHUNKS_SUPPORTED 1242 typedef int (PNGAPI *png_user_chunk_ptr) PNGARG((png_structp, png_unknown_chunkp)); 1243 #endif 1244 #ifdef PNG_UNKNOWN_CHUNKS_SUPPORTED 1245 typedef void (PNGAPI *png_unknown_chunk_ptr) PNGARG((png_structp)); 1246 #endif 1247 1248 /* Transform masks for the high-level interface */ 1249 #define PNG_TRANSFORM_IDENTITY 0x0000 /* read and write */ 1250 #define PNG_TRANSFORM_STRIP_16 0x0001 /* read only */ 1251 #define PNG_TRANSFORM_STRIP_ALPHA 0x0002 /* read only */ 1252 #define PNG_TRANSFORM_PACKING 0x0004 /* read and write */ 1253 #define PNG_TRANSFORM_PACKSWAP 0x0008 /* read and write */ 1254 #define PNG_TRANSFORM_EXPAND 0x0010 /* read only */ 1255 #define PNG_TRANSFORM_INVERT_MONO 0x0020 /* read and write */ 1256 #define PNG_TRANSFORM_SHIFT 0x0040 /* read and write */ 1257 #define PNG_TRANSFORM_BGR 0x0080 /* read and write */ 1258 #define PNG_TRANSFORM_SWAP_ALPHA 0x0100 /* read and write */ 1259 #define PNG_TRANSFORM_SWAP_ENDIAN 0x0200 /* read and write */ 1260 #define PNG_TRANSFORM_INVERT_ALPHA 0x0400 /* read and write */ 1261 #define PNG_TRANSFORM_STRIP_FILLER 0x0800 /* write only, deprecated */ 1262 /* Added to libpng-1.2.34 */ 1263 #define PNG_TRANSFORM_STRIP_FILLER_BEFORE 0x0800 /* write only */ 1264 #define PNG_TRANSFORM_STRIP_FILLER_AFTER 0x1000 /* write only */ 1265 /* Added to libpng-1.2.41 */ 1266 #define PNG_TRANSFORM_GRAY_TO_RGB 0x2000 /* read only */ 1267 1268 /* Flags for MNG supported features */ 1269 #define PNG_FLAG_MNG_EMPTY_PLTE 0x01 1270 #define PNG_FLAG_MNG_FILTER_64 0x04 1271 #define PNG_ALL_MNG_FEATURES 0x05 1272 1273 typedef png_voidp (*png_malloc_ptr) PNGARG((png_structp, png_size_t)); 1274 typedef void (*png_free_ptr) PNGARG((png_structp, png_voidp)); 1275 1276 /* The structure that holds the information to read and write PNG files. 1277 * The only people who need to care about what is inside of this are the 1278 * people who will be modifying the library for their own special needs. 1279 * It should NOT be accessed directly by an application, except to store 1280 * the jmp_buf. 1281 */ 1282 1283 struct png_struct_def 1284 { 1285 #ifdef PNG_SETJMP_SUPPORTED 1286 jmp_buf jmpbuf; /* used in png_error */ 1287 #endif 1288 png_error_ptr error_fn PNG_DEPSTRUCT; /* function for printing errors and aborting */ 1289 png_error_ptr warning_fn PNG_DEPSTRUCT; /* function for printing warnings */ 1290 png_voidp error_ptr PNG_DEPSTRUCT; /* user supplied struct for error functions */ 1291 png_rw_ptr write_data_fn PNG_DEPSTRUCT; /* function for writing output data */ 1292 png_rw_ptr read_data_fn PNG_DEPSTRUCT; /* function for reading input data */ 1293 #ifdef PNG_INDEX_SUPPORTED 1294 png_seek_ptr seek_data_fn PNG_DEPSTRUCT; /* function for seeking input data */ 1295 #endif 1296 png_voidp io_ptr PNG_DEPSTRUCT; /* ptr to application struct for I/O functions */ 1297 1298 #ifdef PNG_READ_USER_TRANSFORM_SUPPORTED 1299 png_user_transform_ptr read_user_transform_fn PNG_DEPSTRUCT; /* user read transform */ 1300 #endif 1301 1302 #ifdef PNG_WRITE_USER_TRANSFORM_SUPPORTED 1303 png_user_transform_ptr write_user_transform_fn PNG_DEPSTRUCT; /* user write transform */ 1304 #endif 1305 1306 /* These were added in libpng-1.0.2 */ 1307 #ifdef PNG_USER_TRANSFORM_PTR_SUPPORTED 1308 #if defined(PNG_READ_USER_TRANSFORM_SUPPORTED) || \ 1309 defined(PNG_WRITE_USER_TRANSFORM_SUPPORTED) 1310 png_voidp user_transform_ptr PNG_DEPSTRUCT; /* user supplied struct for user transform */ 1311 png_byte user_transform_depth PNG_DEPSTRUCT; /* bit depth of user transformed pixels */ 1312 png_byte user_transform_channels PNG_DEPSTRUCT; /* channels in user transformed pixels */ 1313 #endif 1314 #endif 1315 1316 png_uint_32 mode PNG_DEPSTRUCT; /* tells us where we are in the PNG file */ 1317 png_uint_32 flags PNG_DEPSTRUCT; /* flags indicating various things to libpng */ 1318 png_uint_32 transformations PNG_DEPSTRUCT; /* which transformations to perform */ 1319 1320 z_stream zstream PNG_DEPSTRUCT; /* pointer to decompression structure (below) */ 1321 png_bytep zbuf PNG_DEPSTRUCT; /* buffer for zlib */ 1322 png_size_t zbuf_size PNG_DEPSTRUCT; /* size of zbuf */ 1323 int zlib_level PNG_DEPSTRUCT; /* holds zlib compression level */ 1324 int zlib_method PNG_DEPSTRUCT; /* holds zlib compression method */ 1325 int zlib_window_bits PNG_DEPSTRUCT; /* holds zlib compression window bits */ 1326 int zlib_mem_level PNG_DEPSTRUCT; /* holds zlib compression memory level */ 1327 int zlib_strategy PNG_DEPSTRUCT; /* holds zlib compression strategy */ 1328 1329 png_uint_32 width PNG_DEPSTRUCT; /* width of image in pixels */ 1330 png_uint_32 height PNG_DEPSTRUCT; /* height of image in pixels */ 1331 png_uint_32 num_rows PNG_DEPSTRUCT; /* number of rows in current pass */ 1332 png_uint_32 usr_width PNG_DEPSTRUCT; /* width of row at start of write */ 1333 png_uint_32 rowbytes PNG_DEPSTRUCT; /* size of row in bytes */ 1334 #if 0 /* Replaced with the following in libpng-1.2.43 */ 1335 png_size_t irowbytes PNG_DEPSTRUCT; 1336 #endif 1337 /* Added in libpng-1.2.43 */ 1338 #ifdef PNG_USER_LIMITS_SUPPORTED 1339 /* Added in libpng-1.4.0: Total number of sPLT, text, and unknown 1340 * chunks that can be stored (0 means unlimited). 1341 */ 1342 png_uint_32 user_chunk_cache_max PNG_DEPSTRUCT; 1343 #endif 1344 png_uint_32 iwidth PNG_DEPSTRUCT; /* width of current interlaced row in pixels */ 1345 png_uint_32 row_number PNG_DEPSTRUCT; /* current row in interlace pass */ 1346 png_bytep prev_row PNG_DEPSTRUCT; /* buffer to save previous (unfiltered) row */ 1347 png_bytep row_buf PNG_DEPSTRUCT; /* buffer to save current (unfiltered) row */ 1348 #ifndef PNG_NO_WRITE_FILTER 1349 png_bytep sub_row PNG_DEPSTRUCT; /* buffer to save "sub" row when filtering */ 1350 png_bytep up_row PNG_DEPSTRUCT; /* buffer to save "up" row when filtering */ 1351 png_bytep avg_row PNG_DEPSTRUCT; /* buffer to save "avg" row when filtering */ 1352 png_bytep paeth_row PNG_DEPSTRUCT; /* buffer to save "Paeth" row when filtering */ 1353 #endif 1354 png_row_info row_info PNG_DEPSTRUCT; /* used for transformation routines */ 1355 1356 png_uint_32 idat_size PNG_DEPSTRUCT; /* current IDAT size for read */ 1357 png_uint_32 crc PNG_DEPSTRUCT; /* current chunk CRC value */ 1358 png_colorp palette PNG_DEPSTRUCT; /* palette from the input file */ 1359 png_uint_16 num_palette PNG_DEPSTRUCT; /* number of color entries in palette */ 1360 png_uint_16 num_trans PNG_DEPSTRUCT; /* number of transparency values */ 1361 png_byte chunk_name[5] PNG_DEPSTRUCT; /* null-terminated name of current chunk */ 1362 png_byte compression PNG_DEPSTRUCT; /* file compression type (always 0) */ 1363 png_byte filter PNG_DEPSTRUCT; /* file filter type (always 0) */ 1364 png_byte interlaced PNG_DEPSTRUCT; /* PNG_INTERLACE_NONE, PNG_INTERLACE_ADAM7 */ 1365 png_byte pass PNG_DEPSTRUCT; /* current interlace pass (0 - 6) */ 1366 png_byte do_filter PNG_DEPSTRUCT; /* row filter flags (see PNG_FILTER_ below ) */ 1367 png_byte color_type PNG_DEPSTRUCT; /* color type of file */ 1368 png_byte bit_depth PNG_DEPSTRUCT; /* bit depth of file */ 1369 png_byte usr_bit_depth PNG_DEPSTRUCT; /* bit depth of users row */ 1370 png_byte pixel_depth PNG_DEPSTRUCT; /* number of bits per pixel */ 1371 png_byte channels PNG_DEPSTRUCT; /* number of channels in file */ 1372 png_byte usr_channels PNG_DEPSTRUCT; /* channels at start of write */ 1373 png_byte sig_bytes PNG_DEPSTRUCT; /* magic bytes read/written from start of file */ 1374 1375 #if defined(PNG_READ_FILLER_SUPPORTED) || defined(PNG_WRITE_FILLER_SUPPORTED) 1376 #ifdef PNG_LEGACY_SUPPORTED 1377 png_byte filler PNG_DEPSTRUCT; /* filler byte for pixel expansion */ 1378 #else 1379 png_uint_16 filler PNG_DEPSTRUCT; /* filler bytes for pixel expansion */ 1380 #endif 1381 #endif 1382 1383 #ifdef PNG_bKGD_SUPPORTED 1384 png_byte background_gamma_type PNG_DEPSTRUCT; 1385 # ifdef PNG_FLOATING_POINT_SUPPORTED 1386 float background_gamma PNG_DEPSTRUCT; 1387 # endif 1388 png_color_16 background PNG_DEPSTRUCT; /* background color in screen gamma space */ 1389 #ifdef PNG_READ_GAMMA_SUPPORTED 1390 png_color_16 background_1 PNG_DEPSTRUCT; /* background normalized to gamma 1.0 */ 1391 #endif 1392 #endif /* PNG_bKGD_SUPPORTED */ 1393 1394 #ifdef PNG_WRITE_FLUSH_SUPPORTED 1395 png_flush_ptr output_flush_fn PNG_DEPSTRUCT; /* Function for flushing output */ 1396 png_uint_32 flush_dist PNG_DEPSTRUCT; /* how many rows apart to flush, 0 - no flush */ 1397 png_uint_32 flush_rows PNG_DEPSTRUCT; /* number of rows written since last flush */ 1398 #endif 1399 1400 #if defined(PNG_READ_GAMMA_SUPPORTED) || defined(PNG_READ_BACKGROUND_SUPPORTED) 1401 int gamma_shift PNG_DEPSTRUCT; /* number of "insignificant" bits 16-bit gamma */ 1402 #ifdef PNG_FLOATING_POINT_SUPPORTED 1403 float gamma PNG_DEPSTRUCT; /* file gamma value */ 1404 float screen_gamma PNG_DEPSTRUCT; /* screen gamma value (display_exponent) */ 1405 #endif 1406 #endif 1407 1408 #if defined(PNG_READ_GAMMA_SUPPORTED) || defined(PNG_READ_BACKGROUND_SUPPORTED) 1409 png_bytep gamma_table PNG_DEPSTRUCT; /* gamma table for 8-bit depth files */ 1410 png_bytep gamma_from_1 PNG_DEPSTRUCT; /* converts from 1.0 to screen */ 1411 png_bytep gamma_to_1 PNG_DEPSTRUCT; /* converts from file to 1.0 */ 1412 png_uint_16pp gamma_16_table PNG_DEPSTRUCT; /* gamma table for 16-bit depth files */ 1413 png_uint_16pp gamma_16_from_1 PNG_DEPSTRUCT; /* converts from 1.0 to screen */ 1414 png_uint_16pp gamma_16_to_1 PNG_DEPSTRUCT; /* converts from file to 1.0 */ 1415 #endif 1416 1417 #if defined(PNG_READ_GAMMA_SUPPORTED) || defined(PNG_sBIT_SUPPORTED) 1418 png_color_8 sig_bit PNG_DEPSTRUCT; /* significant bits in each available channel */ 1419 #endif 1420 1421 #if defined(PNG_READ_SHIFT_SUPPORTED) || defined(PNG_WRITE_SHIFT_SUPPORTED) 1422 png_color_8 shift PNG_DEPSTRUCT; /* shift for significant bit tranformation */ 1423 #endif 1424 1425 #if defined(PNG_tRNS_SUPPORTED) || defined(PNG_READ_BACKGROUND_SUPPORTED) \ 1426 || defined(PNG_READ_EXPAND_SUPPORTED) || defined(PNG_READ_BACKGROUND_SUPPORTED) 1427 png_bytep trans PNG_DEPSTRUCT; /* transparency values for paletted files */ 1428 png_color_16 trans_values PNG_DEPSTRUCT; /* transparency values for non-paletted files */ 1429 #endif 1430 1431 png_read_status_ptr read_row_fn PNG_DEPSTRUCT; /* called after each row is decoded */ 1432 png_write_status_ptr write_row_fn PNG_DEPSTRUCT; /* called after each row is encoded */ 1433 #ifdef PNG_PROGRESSIVE_READ_SUPPORTED 1434 png_progressive_info_ptr info_fn PNG_DEPSTRUCT; /* called after header data fully read */ 1435 png_progressive_row_ptr row_fn PNG_DEPSTRUCT; /* called after each prog. row is decoded */ 1436 png_progressive_end_ptr end_fn PNG_DEPSTRUCT; /* called after image is complete */ 1437 png_bytep save_buffer_ptr PNG_DEPSTRUCT; /* current location in save_buffer */ 1438 png_bytep save_buffer PNG_DEPSTRUCT; /* buffer for previously read data */ 1439 png_bytep current_buffer_ptr PNG_DEPSTRUCT; /* current location in current_buffer */ 1440 png_bytep current_buffer PNG_DEPSTRUCT; /* buffer for recently used data */ 1441 png_uint_32 push_length PNG_DEPSTRUCT; /* size of current input chunk */ 1442 png_uint_32 skip_length PNG_DEPSTRUCT; /* bytes to skip in input data */ 1443 png_size_t save_buffer_size PNG_DEPSTRUCT; /* amount of data now in save_buffer */ 1444 png_size_t save_buffer_max PNG_DEPSTRUCT; /* total size of save_buffer */ 1445 png_size_t buffer_size PNG_DEPSTRUCT; /* total amount of available input data */ 1446 png_size_t current_buffer_size PNG_DEPSTRUCT; /* amount of data now in current_buffer */ 1447 int process_mode PNG_DEPSTRUCT; /* what push library is currently doing */ 1448 int cur_palette PNG_DEPSTRUCT; /* current push library palette index */ 1449 1450 # ifdef PNG_TEXT_SUPPORTED 1451 png_size_t current_text_size PNG_DEPSTRUCT; /* current size of text input data */ 1452 png_size_t current_text_left PNG_DEPSTRUCT; /* how much text left to read in input */ 1453 png_charp current_text PNG_DEPSTRUCT; /* current text chunk buffer */ 1454 png_charp current_text_ptr PNG_DEPSTRUCT; /* current location in current_text */ 1455 # endif /* PNG_TEXT_SUPPORTED */ 1456 #endif /* PNG_PROGRESSIVE_READ_SUPPORTED */ 1457 1458 #if defined(__TURBOC__) && !defined(_Windows) && !defined(__FLAT__) 1459 /* for the Borland special 64K segment handler */ 1460 png_bytepp offset_table_ptr PNG_DEPSTRUCT; 1461 png_bytep offset_table PNG_DEPSTRUCT; 1462 png_uint_16 offset_table_number PNG_DEPSTRUCT; 1463 png_uint_16 offset_table_count PNG_DEPSTRUCT; 1464 png_uint_16 offset_table_count_free PNG_DEPSTRUCT; 1465 #endif 1466 1467 #ifdef PNG_READ_DITHER_SUPPORTED 1468 png_bytep palette_lookup PNG_DEPSTRUCT; /* lookup table for dithering */ 1469 png_bytep dither_index PNG_DEPSTRUCT; /* index translation for palette files */ 1470 #endif 1471 1472 #if defined(PNG_READ_DITHER_SUPPORTED) || defined(PNG_hIST_SUPPORTED) 1473 png_uint_16p hist PNG_DEPSTRUCT; /* histogram */ 1474 #endif 1475 1476 #ifdef PNG_WRITE_WEIGHTED_FILTER_SUPPORTED 1477 png_byte heuristic_method PNG_DEPSTRUCT; /* heuristic for row filter selection */ 1478 png_byte num_prev_filters PNG_DEPSTRUCT; /* number of weights for previous rows */ 1479 png_bytep prev_filters PNG_DEPSTRUCT; /* filter type(s) of previous row(s) */ 1480 png_uint_16p filter_weights PNG_DEPSTRUCT; /* weight(s) for previous line(s) */ 1481 png_uint_16p inv_filter_weights PNG_DEPSTRUCT; /* 1/weight(s) for previous line(s) */ 1482 png_uint_16p filter_costs PNG_DEPSTRUCT; /* relative filter calculation cost */ 1483 png_uint_16p inv_filter_costs PNG_DEPSTRUCT; /* 1/relative filter calculation cost */ 1484 #endif 1485 1486 #ifdef PNG_TIME_RFC1123_SUPPORTED 1487 png_charp time_buffer PNG_DEPSTRUCT; /* String to hold RFC 1123 time text */ 1488 #endif 1489 1490 /* New members added in libpng-1.0.6 */ 1491 1492 #ifdef PNG_FREE_ME_SUPPORTED 1493 png_uint_32 free_me PNG_DEPSTRUCT; /* flags items libpng is responsible for freeing */ 1494 #endif 1495 1496 #ifdef PNG_USER_CHUNKS_SUPPORTED 1497 png_voidp user_chunk_ptr PNG_DEPSTRUCT; 1498 png_user_chunk_ptr read_user_chunk_fn PNG_DEPSTRUCT; /* user read chunk handler */ 1499 #endif 1500 1501 #ifdef PNG_HANDLE_AS_UNKNOWN_SUPPORTED 1502 int num_chunk_list PNG_DEPSTRUCT; 1503 png_bytep chunk_list PNG_DEPSTRUCT; 1504 #endif 1505 1506 /* New members added in libpng-1.0.3 */ 1507 #ifdef PNG_READ_RGB_TO_GRAY_SUPPORTED 1508 png_byte rgb_to_gray_status PNG_DEPSTRUCT; 1509 /* These were changed from png_byte in libpng-1.0.6 */ 1510 png_uint_16 rgb_to_gray_red_coeff PNG_DEPSTRUCT; 1511 png_uint_16 rgb_to_gray_green_coeff PNG_DEPSTRUCT; 1512 png_uint_16 rgb_to_gray_blue_coeff PNG_DEPSTRUCT; 1513 #endif 1514 1515 /* New member added in libpng-1.0.4 (renamed in 1.0.9) */ 1516 #if defined(PNG_MNG_FEATURES_SUPPORTED) || \ 1517 defined(PNG_READ_EMPTY_PLTE_SUPPORTED) || \ 1518 defined(PNG_WRITE_EMPTY_PLTE_SUPPORTED) 1519 /* Changed from png_byte to png_uint_32 at version 1.2.0 */ 1520 #ifdef PNG_1_0_X 1521 png_byte mng_features_permitted PNG_DEPSTRUCT; 1522 #else 1523 png_uint_32 mng_features_permitted PNG_DEPSTRUCT; 1524 #endif /* PNG_1_0_X */ 1525 #endif 1526 1527 /* New member added in libpng-1.0.7 */ 1528 #if defined(PNG_READ_GAMMA_SUPPORTED) || defined(PNG_READ_BACKGROUND_SUPPORTED) 1529 png_fixed_point int_gamma PNG_DEPSTRUCT; 1530 #endif 1531 1532 /* New member added in libpng-1.0.9, ifdef'ed out in 1.0.12, enabled in 1.2.0 */ 1533 #ifdef PNG_MNG_FEATURES_SUPPORTED 1534 png_byte filter_type PNG_DEPSTRUCT; 1535 #endif 1536 1537 #ifdef PNG_1_0_X 1538 /* New member added in libpng-1.0.10, ifdef'ed out in 1.2.0 */ 1539 png_uint_32 row_buf_size PNG_DEPSTRUCT; 1540 #endif 1541 1542 /* New members added in libpng-1.2.0 */ 1543 #ifdef PNG_ASSEMBLER_CODE_SUPPORTED 1544 # ifndef PNG_1_0_X 1545 # ifdef PNG_MMX_CODE_SUPPORTED 1546 png_byte mmx_bitdepth_threshold PNG_DEPSTRUCT; 1547 png_uint_32 mmx_rowbytes_threshold PNG_DEPSTRUCT; 1548 # endif 1549 png_uint_32 asm_flags PNG_DEPSTRUCT; 1550 # endif 1551 #endif 1552 1553 /* New members added in libpng-1.0.2 but first enabled by default in 1.2.0 */ 1554 #ifdef PNG_USER_MEM_SUPPORTED 1555 png_voidp mem_ptr PNG_DEPSTRUCT; /* user supplied struct for mem functions */ 1556 png_malloc_ptr malloc_fn PNG_DEPSTRUCT; /* function for allocating memory */ 1557 png_free_ptr free_fn PNG_DEPSTRUCT; /* function for freeing memory */ 1558 #endif 1559 1560 /* New member added in libpng-1.0.13 and 1.2.0 */ 1561 png_bytep big_row_buf PNG_DEPSTRUCT; /* buffer to save current (unfiltered) row */ 1562 1563 #ifdef PNG_READ_DITHER_SUPPORTED 1564 /* The following three members were added at version 1.0.14 and 1.2.4 */ 1565 png_bytep dither_sort PNG_DEPSTRUCT; /* working sort array */ 1566 png_bytep index_to_palette PNG_DEPSTRUCT; /* where the original index currently is */ 1567 /* in the palette */ 1568 png_bytep palette_to_index PNG_DEPSTRUCT; /* which original index points to this */ 1569 /* palette color */ 1570 #endif 1571 1572 /* New members added in libpng-1.0.16 and 1.2.6 */ 1573 png_byte compression_type PNG_DEPSTRUCT; 1574 1575 #ifdef PNG_USER_LIMITS_SUPPORTED 1576 png_uint_32 user_width_max PNG_DEPSTRUCT; 1577 png_uint_32 user_height_max PNG_DEPSTRUCT; 1578 #endif 1579 1580 /* New member added in libpng-1.0.25 and 1.2.17 */ 1581 #ifdef PNG_UNKNOWN_CHUNKS_SUPPORTED 1582 /* Storage for unknown chunk that the library doesn't recognize. */ 1583 png_unknown_chunk unknown_chunk PNG_DEPSTRUCT; 1584 #endif 1585 1586 #ifdef PNG_INDEX_SUPPORTED 1587 png_indexp index PNG_DEPSTRUCT; 1588 png_uint_32 total_data_read; 1589 #endif 1590 1591 /* New members added in libpng-1.2.26 */ 1592 png_uint_32 old_big_row_buf_size PNG_DEPSTRUCT; 1593 png_uint_32 old_prev_row_size PNG_DEPSTRUCT; 1594 1595 /* New member added in libpng-1.2.30 */ 1596 png_charp chunkdata PNG_DEPSTRUCT; /* buffer for reading chunk data */ 1597 }; 1598 1599 1600 /* This triggers a compiler error in png.c, if png.c and png.h 1601 * do not agree upon the version number. 1602 */ 1603 typedef png_structp version_1_2_44; 1604 1605 typedef png_struct FAR * FAR * png_structpp; 1606 1607 /* Here are the function definitions most commonly used. This is not 1608 * the place to find out how to use libpng. See libpng.txt for the 1609 * full explanation, see example.c for the summary. This just provides 1610 * a simple one line description of the use of each function. 1611 */ 1612 1613 /* Returns the version number of the library */ 1614 extern PNG_EXPORT(png_uint_32,png_access_version_number) PNGARG((void)); 1615 1616 /* Tell lib we have already handled the first <num_bytes> magic bytes. 1617 * Handling more than 8 bytes from the beginning of the file is an error. 1618 */ 1619 extern PNG_EXPORT(void,png_set_sig_bytes) PNGARG((png_structp png_ptr, 1620 int num_bytes)); 1621 1622 /* Check sig[start] through sig[start + num_to_check - 1] to see if it's a 1623 * PNG file. Returns zero if the supplied bytes match the 8-byte PNG 1624 * signature, and non-zero otherwise. Having num_to_check == 0 or 1625 * start > 7 will always fail (ie return non-zero). 1626 */ 1627 extern PNG_EXPORT(int,png_sig_cmp) PNGARG((png_bytep sig, png_size_t start, 1628 png_size_t num_to_check)); 1629 1630 /* Simple signature checking function. This is the same as calling 1631 * png_check_sig(sig, n) := !png_sig_cmp(sig, 0, n). 1632 */ 1633 extern PNG_EXPORT(int,png_check_sig) PNGARG((png_bytep sig, int num)) PNG_DEPRECATED; 1634 1635 /* Allocate and initialize png_ptr struct for reading, and any other memory. */ 1636 extern PNG_EXPORT(png_structp,png_create_read_struct) 1637 PNGARG((png_const_charp user_png_ver, png_voidp error_ptr, 1638 png_error_ptr error_fn, png_error_ptr warn_fn)) PNG_ALLOCATED; 1639 1640 /* Allocate and initialize png_ptr struct for writing, and any other memory */ 1641 extern PNG_EXPORT(png_structp,png_create_write_struct) 1642 PNGARG((png_const_charp user_png_ver, png_voidp error_ptr, 1643 png_error_ptr error_fn, png_error_ptr warn_fn)) PNG_ALLOCATED; 1644 1645 #ifdef PNG_WRITE_SUPPORTED 1646 extern PNG_EXPORT(png_uint_32,png_get_compression_buffer_size) 1647 PNGARG((png_structp png_ptr)); 1648 #endif 1649 1650 #ifdef PNG_WRITE_SUPPORTED 1651 extern PNG_EXPORT(void,png_set_compression_buffer_size) 1652 PNGARG((png_structp png_ptr, png_uint_32 size)); 1653 #endif 1654 1655 /* Reset the compression stream */ 1656 extern PNG_EXPORT(int,png_reset_zstream) PNGARG((png_structp png_ptr)); 1657 1658 /* New functions added in libpng-1.0.2 (not enabled by default until 1.2.0) */ 1659 #ifdef PNG_USER_MEM_SUPPORTED 1660 extern PNG_EXPORT(png_structp,png_create_read_struct_2) 1661 PNGARG((png_const_charp user_png_ver, png_voidp error_ptr, 1662 png_error_ptr error_fn, png_error_ptr warn_fn, png_voidp mem_ptr, 1663 png_malloc_ptr malloc_fn, png_free_ptr free_fn)) PNG_ALLOCATED; 1664 extern PNG_EXPORT(png_structp,png_create_write_struct_2) 1665 PNGARG((png_const_charp user_png_ver, png_voidp error_ptr, 1666 png_error_ptr error_fn, png_error_ptr warn_fn, png_voidp mem_ptr, 1667 png_malloc_ptr malloc_fn, png_free_ptr free_fn)) PNG_ALLOCATED; 1668 #endif 1669 1670 /* Write a PNG chunk - size, type, (optional) data, CRC. */ 1671 extern PNG_EXPORT(void,png_write_chunk) PNGARG((png_structp png_ptr, 1672 png_bytep chunk_name, png_bytep data, png_size_t length)); 1673 1674 /* Write the start of a PNG chunk - length and chunk name. */ 1675 extern PNG_EXPORT(void,png_write_chunk_start) PNGARG((png_structp png_ptr, 1676 png_bytep chunk_name, png_uint_32 length)); 1677 1678 /* Write the data of a PNG chunk started with png_write_chunk_start(). */ 1679 extern PNG_EXPORT(void,png_write_chunk_data) PNGARG((png_structp png_ptr, 1680 png_bytep data, png_size_t length)); 1681 1682 /* Finish a chunk started with png_write_chunk_start() (includes CRC). */ 1683 extern PNG_EXPORT(void,png_write_chunk_end) PNGARG((png_structp png_ptr)); 1684 1685 /* Allocate and initialize the info structure */ 1686 extern PNG_EXPORT(png_infop,png_create_info_struct) 1687 PNGARG((png_structp png_ptr)) PNG_ALLOCATED; 1688 1689 #if defined(PNG_1_0_X) || defined (PNG_1_2_X) 1690 /* Initialize the info structure (old interface - DEPRECATED) */ 1691 extern PNG_EXPORT(void,png_info_init) PNGARG((png_infop info_ptr)) 1692 PNG_DEPRECATED; 1693 #undef png_info_init 1694 #define png_info_init(info_ptr) png_info_init_3(&info_ptr,\ 1695 png_sizeof(png_info)); 1696 #endif 1697 1698 extern PNG_EXPORT(void,png_info_init_3) PNGARG((png_infopp info_ptr, 1699 png_size_t png_info_struct_size)); 1700 1701 /* Writes all the PNG information before the image. */ 1702 extern PNG_EXPORT(void,png_write_info_before_PLTE) PNGARG((png_structp png_ptr, 1703 png_infop info_ptr)); 1704 extern PNG_EXPORT(void,png_write_info) PNGARG((png_structp png_ptr, 1705 png_infop info_ptr)); 1706 1707 #ifdef PNG_SEQUENTIAL_READ_SUPPORTED 1708 /* Read the information before the actual image data. */ 1709 extern PNG_EXPORT(void,png_read_info) PNGARG((png_structp png_ptr, 1710 png_infop info_ptr)); 1711 #endif 1712 1713 #ifdef PNG_TIME_RFC1123_SUPPORTED 1714 extern PNG_EXPORT(png_charp,png_convert_to_rfc1123) 1715 PNGARG((png_structp png_ptr, png_timep ptime)); 1716 #endif 1717 1718 #ifdef PNG_CONVERT_tIME_SUPPORTED 1719 /* Convert from a struct tm to png_time */ 1720 extern PNG_EXPORT(void,png_convert_from_struct_tm) PNGARG((png_timep ptime, 1721 struct tm FAR * ttime)); 1722 1723 /* Convert from time_t to png_time. Uses gmtime() */ 1724 extern PNG_EXPORT(void,png_convert_from_time_t) PNGARG((png_timep ptime, 1725 time_t ttime)); 1726 #endif /* PNG_CONVERT_tIME_SUPPORTED */ 1727 1728 #ifdef PNG_READ_EXPAND_SUPPORTED 1729 /* Expand data to 24-bit RGB, or 8-bit grayscale, with alpha if available. */ 1730 extern PNG_EXPORT(void,png_set_expand) PNGARG((png_structp png_ptr)); 1731 #ifndef PNG_1_0_X 1732 extern PNG_EXPORT(void,png_set_expand_gray_1_2_4_to_8) PNGARG((png_structp 1733 png_ptr)); 1734 #endif 1735 extern PNG_EXPORT(void,png_set_palette_to_rgb) PNGARG((png_structp png_ptr)); 1736 extern PNG_EXPORT(void,png_set_tRNS_to_alpha) PNGARG((png_structp png_ptr)); 1737 #if defined(PNG_1_0_X) || defined (PNG_1_2_X) 1738 /* Deprecated */ 1739 extern PNG_EXPORT(void,png_set_gray_1_2_4_to_8) PNGARG((png_structp 1740 png_ptr)) PNG_DEPRECATED; 1741 #endif 1742 #endif 1743 1744 #if defined(PNG_READ_BGR_SUPPORTED) || defined(PNG_WRITE_BGR_SUPPORTED) 1745 /* Use blue, green, red order for pixels. */ 1746 extern PNG_EXPORT(void,png_set_bgr) PNGARG((png_structp png_ptr)); 1747 #endif 1748 1749 #ifdef PNG_READ_GRAY_TO_RGB_SUPPORTED 1750 /* Expand the grayscale to 24-bit RGB if necessary. */ 1751 extern PNG_EXPORT(void,png_set_gray_to_rgb) PNGARG((png_structp png_ptr)); 1752 #endif 1753 1754 #ifdef PNG_READ_RGB_TO_GRAY_SUPPORTED 1755 /* Reduce RGB to grayscale. */ 1756 #ifdef PNG_FLOATING_POINT_SUPPORTED 1757 extern PNG_EXPORT(void,png_set_rgb_to_gray) PNGARG((png_structp png_ptr, 1758 int error_action, double red, double green )); 1759 #endif 1760 extern PNG_EXPORT(void,png_set_rgb_to_gray_fixed) PNGARG((png_structp png_ptr, 1761 int error_action, png_fixed_point red, png_fixed_point green )); 1762 extern PNG_EXPORT(png_byte,png_get_rgb_to_gray_status) PNGARG((png_structp 1763 png_ptr)); 1764 #endif 1765 1766 extern PNG_EXPORT(void,png_build_grayscale_palette) PNGARG((int bit_depth, 1767 png_colorp palette)); 1768 1769 #ifdef PNG_READ_STRIP_ALPHA_SUPPORTED 1770 extern PNG_EXPORT(void,png_set_strip_alpha) PNGARG((png_structp png_ptr)); 1771 #endif 1772 1773 #if defined(PNG_READ_SWAP_ALPHA_SUPPORTED) || \ 1774 defined(PNG_WRITE_SWAP_ALPHA_SUPPORTED) 1775 extern PNG_EXPORT(void,png_set_swap_alpha) PNGARG((png_structp png_ptr)); 1776 #endif 1777 1778 #if defined(PNG_READ_INVERT_ALPHA_SUPPORTED) || \ 1779 defined(PNG_WRITE_INVERT_ALPHA_SUPPORTED) 1780 extern PNG_EXPORT(void,png_set_invert_alpha) PNGARG((png_structp png_ptr)); 1781 #endif 1782 1783 #if defined(PNG_READ_FILLER_SUPPORTED) || defined(PNG_WRITE_FILLER_SUPPORTED) 1784 /* Add a filler byte to 8-bit Gray or 24-bit RGB images. */ 1785 extern PNG_EXPORT(void,png_set_filler) PNGARG((png_structp png_ptr, 1786 png_uint_32 filler, int flags)); 1787 /* The values of the PNG_FILLER_ defines should NOT be changed */ 1788 #define PNG_FILLER_BEFORE 0 1789 #define PNG_FILLER_AFTER 1 1790 /* Add an alpha byte to 8-bit Gray or 24-bit RGB images. */ 1791 #ifndef PNG_1_0_X 1792 extern PNG_EXPORT(void,png_set_add_alpha) PNGARG((png_structp png_ptr, 1793 png_uint_32 filler, int flags)); 1794 #endif 1795 #endif /* PNG_READ_FILLER_SUPPORTED || PNG_WRITE_FILLER_SUPPORTED */ 1796 1797 #if defined(PNG_READ_SWAP_SUPPORTED) || defined(PNG_WRITE_SWAP_SUPPORTED) 1798 /* Swap bytes in 16-bit depth files. */ 1799 extern PNG_EXPORT(void,png_set_swap) PNGARG((png_structp png_ptr)); 1800 #endif 1801 1802 #if defined(PNG_READ_PACK_SUPPORTED) || defined(PNG_WRITE_PACK_SUPPORTED) 1803 /* Use 1 byte per pixel in 1, 2, or 4-bit depth files. */ 1804 extern PNG_EXPORT(void,png_set_packing) PNGARG((png_structp png_ptr)); 1805 #endif 1806 1807 #if defined(PNG_READ_PACKSWAP_SUPPORTED) || defined(PNG_WRITE_PACKSWAP_SUPPORTED) 1808 /* Swap packing order of pixels in bytes. */ 1809 extern PNG_EXPORT(void,png_set_packswap) PNGARG((png_structp png_ptr)); 1810 #endif 1811 1812 #if defined(PNG_READ_SHIFT_SUPPORTED) || defined(PNG_WRITE_SHIFT_SUPPORTED) 1813 /* Converts files to legal bit depths. */ 1814 extern PNG_EXPORT(void,png_set_shift) PNGARG((png_structp png_ptr, 1815 png_color_8p true_bits)); 1816 #endif 1817 1818 #if defined(PNG_READ_INTERLACING_SUPPORTED) || \ 1819 defined(PNG_WRITE_INTERLACING_SUPPORTED) 1820 /* Have the code handle the interlacing. Returns the number of passes. */ 1821 extern PNG_EXPORT(int,png_set_interlace_handling) PNGARG((png_structp png_ptr)); 1822 #endif 1823 1824 #if defined(PNG_READ_INVERT_SUPPORTED) || defined(PNG_WRITE_INVERT_SUPPORTED) 1825 /* Invert monochrome files */ 1826 extern PNG_EXPORT(void,png_set_invert_mono) PNGARG((png_structp png_ptr)); 1827 #endif 1828 1829 #ifdef PNG_READ_BACKGROUND_SUPPORTED 1830 /* Handle alpha and tRNS by replacing with a background color. */ 1831 #ifdef PNG_FLOATING_POINT_SUPPORTED 1832 extern PNG_EXPORT(void,png_set_background) PNGARG((png_structp png_ptr, 1833 png_color_16p background_color, int background_gamma_code, 1834 int need_expand, double background_gamma)); 1835 #endif 1836 #define PNG_BACKGROUND_GAMMA_UNKNOWN 0 1837 #define PNG_BACKGROUND_GAMMA_SCREEN 1 1838 #define PNG_BACKGROUND_GAMMA_FILE 2 1839 #define PNG_BACKGROUND_GAMMA_UNIQUE 3 1840 #endif 1841 1842 #ifdef PNG_READ_16_TO_8_SUPPORTED 1843 /* Strip the second byte of information from a 16-bit depth file. */ 1844 extern PNG_EXPORT(void,png_set_strip_16) PNGARG((png_structp png_ptr)); 1845 #endif 1846 1847 #ifdef PNG_READ_DITHER_SUPPORTED 1848 /* Turn on dithering, and reduce the palette to the number of colors available. */ 1849 extern PNG_EXPORT(void,png_set_dither) PNGARG((png_structp png_ptr, 1850 png_colorp palette, int num_palette, int maximum_colors, 1851 png_uint_16p histogram, int full_dither)); 1852 #endif 1853 1854 #ifdef PNG_READ_GAMMA_SUPPORTED 1855 /* Handle gamma correction. Screen_gamma=(display_exponent) */ 1856 #ifdef PNG_FLOATING_POINT_SUPPORTED 1857 extern PNG_EXPORT(void,png_set_gamma) PNGARG((png_structp png_ptr, 1858 double screen_gamma, double default_file_gamma)); 1859 #endif 1860 #endif 1861 1862 #if defined(PNG_1_0_X) || defined (PNG_1_2_X) 1863 #if defined(PNG_READ_EMPTY_PLTE_SUPPORTED) || \ 1864 defined(PNG_WRITE_EMPTY_PLTE_SUPPORTED) 1865 /* Permit or disallow empty PLTE (0: not permitted, 1: permitted) */ 1866 /* Deprecated and will be removed. Use png_permit_mng_features() instead. */ 1867 extern PNG_EXPORT(void,png_permit_empty_plte) PNGARG((png_structp png_ptr, 1868 int empty_plte_permitted)) PNG_DEPRECATED; 1869 #endif 1870 #endif 1871 1872 #ifdef PNG_WRITE_FLUSH_SUPPORTED 1873 /* Set how many lines between output flushes - 0 for no flushing */ 1874 extern PNG_EXPORT(void,png_set_flush) PNGARG((png_structp png_ptr, int nrows)); 1875 /* Flush the current PNG output buffer */ 1876 extern PNG_EXPORT(void,png_write_flush) PNGARG((png_structp png_ptr)); 1877 #endif 1878 1879 /* Optional update palette with requested transformations */ 1880 extern PNG_EXPORT(void,png_start_read_image) PNGARG((png_structp png_ptr)); 1881 1882 /* Optional call to update the users info structure */ 1883 extern PNG_EXPORT(void,png_read_update_info) PNGARG((png_structp png_ptr, 1884 png_infop info_ptr)); 1885 1886 #ifndef PNG_NO_SEQUENTIAL_READ_SUPPORTED 1887 /* Read one or more rows of image data. */ 1888 extern PNG_EXPORT(void,png_read_rows) PNGARG((png_structp png_ptr, 1889 png_bytepp row, png_bytepp display_row, png_uint_32 num_rows)); 1890 #endif 1891 1892 #ifndef PNG_NO_SEQUENTIAL_READ_SUPPORTED 1893 /* Read a row of data. */ 1894 extern PNG_EXPORT(void,png_read_row) PNGARG((png_structp png_ptr, 1895 png_bytep row, 1896 png_bytep display_row)); 1897 #endif 1898 1899 #ifdef PNG_INDEX_SUPPORTED 1900 /* Build image index for partial image decoding. */ 1901 extern PNG_EXPORT(void,png_build_index) PNGARG((png_structp png_ptr)); 1902 extern PNG_EXPORT(void,png_configure_decoder) 1903 PNGARG((png_structp png_ptr, int *row_offset, int pass)); 1904 #endif 1905 1906 1907 #ifndef PNG_NO_SEQUENTIAL_READ_SUPPORTED 1908 /* Read the whole image into memory at once. */ 1909 extern PNG_EXPORT(void,png_read_image) PNGARG((png_structp png_ptr, 1910 png_bytepp image)); 1911 #endif 1912 1913 /* Write a row of image data */ 1914 extern PNG_EXPORT(void,png_write_row) PNGARG((png_structp png_ptr, 1915 png_bytep row)); 1916 1917 /* Write a few rows of image data */ 1918 extern PNG_EXPORT(void,png_write_rows) PNGARG((png_structp png_ptr, 1919 png_bytepp row, png_uint_32 num_rows)); 1920 1921 /* Write the image data */ 1922 extern PNG_EXPORT(void,png_write_image) PNGARG((png_structp png_ptr, 1923 png_bytepp image)); 1924 1925 /* Writes the end of the PNG file. */ 1926 extern PNG_EXPORT(void,png_write_end) PNGARG((png_structp png_ptr, 1927 png_infop info_ptr)); 1928 1929 #ifndef PNG_NO_SEQUENTIAL_READ_SUPPORTED 1930 /* Read the end of the PNG file. */ 1931 extern PNG_EXPORT(void,png_read_end) PNGARG((png_structp png_ptr, 1932 png_infop info_ptr)); 1933 #endif 1934 1935 /* Free any memory associated with the png_info_struct */ 1936 extern PNG_EXPORT(void,png_destroy_info_struct) PNGARG((png_structp png_ptr, 1937 png_infopp info_ptr_ptr)); 1938 1939 /* Free any memory associated with the png_struct and the png_info_structs */ 1940 extern PNG_EXPORT(void,png_destroy_read_struct) PNGARG((png_structpp 1941 png_ptr_ptr, png_infopp info_ptr_ptr, png_infopp end_info_ptr_ptr)); 1942 1943 /* Free all memory used by the read (old method - NOT DLL EXPORTED) */ 1944 extern void png_read_destroy PNGARG((png_structp png_ptr, png_infop info_ptr, 1945 png_infop end_info_ptr)) PNG_DEPRECATED; 1946 1947 /* Free any memory associated with the png_struct and the png_info_structs */ 1948 extern PNG_EXPORT(void,png_destroy_write_struct) 1949 PNGARG((png_structpp png_ptr_ptr, png_infopp info_ptr_ptr)); 1950 1951 /* Free any memory used in png_ptr struct (old method - NOT DLL EXPORTED) */ 1952 extern void png_write_destroy PNGARG((png_structp png_ptr)) PNG_DEPRECATED; 1953 1954 /* Set the libpng method of handling chunk CRC errors */ 1955 extern PNG_EXPORT(void,png_set_crc_action) PNGARG((png_structp png_ptr, 1956 int crit_action, int ancil_action)); 1957 1958 /* Values for png_set_crc_action() to say how to handle CRC errors in 1959 * ancillary and critical chunks, and whether to use the data contained 1960 * therein. Note that it is impossible to "discard" data in a critical 1961 * chunk. For versions prior to 0.90, the action was always error/quit, 1962 * whereas in version 0.90 and later, the action for CRC errors in ancillary 1963 * chunks is warn/discard. These values should NOT be changed. 1964 * 1965 * value action:critical action:ancillary 1966 */ 1967 #define PNG_CRC_DEFAULT 0 /* error/quit warn/discard data */ 1968 #define PNG_CRC_ERROR_QUIT 1 /* error/quit error/quit */ 1969 #define PNG_CRC_WARN_DISCARD 2 /* (INVALID) warn/discard data */ 1970 #define PNG_CRC_WARN_USE 3 /* warn/use data warn/use data */ 1971 #define PNG_CRC_QUIET_USE 4 /* quiet/use data quiet/use data */ 1972 #define PNG_CRC_NO_CHANGE 5 /* use current value use current value */ 1973 1974 /* These functions give the user control over the scan-line filtering in 1975 * libpng and the compression methods used by zlib. These functions are 1976 * mainly useful for testing, as the defaults should work with most users. 1977 * Those users who are tight on memory or want faster performance at the 1978 * expense of compression can modify them. See the compression library 1979 * header file (zlib.h) for an explination of the compression functions. 1980 */ 1981 1982 /* Set the filtering method(s) used by libpng. Currently, the only valid 1983 * value for "method" is 0. 1984 */ 1985 extern PNG_EXPORT(void,png_set_filter) PNGARG((png_structp png_ptr, int method, 1986 int filters)); 1987 1988 /* Flags for png_set_filter() to say which filters to use. The flags 1989 * are chosen so that they don't conflict with real filter types 1990 * below, in case they are supplied instead of the #defined constants. 1991 * These values should NOT be changed. 1992 */ 1993 #define PNG_NO_FILTERS 0x00 1994 #define PNG_FILTER_NONE 0x08 1995 #define PNG_FILTER_SUB 0x10 1996 #define PNG_FILTER_UP 0x20 1997 #define PNG_FILTER_AVG 0x40 1998 #define PNG_FILTER_PAETH 0x80 1999 #define PNG_ALL_FILTERS (PNG_FILTER_NONE | PNG_FILTER_SUB | PNG_FILTER_UP | \ 2000 PNG_FILTER_AVG | PNG_FILTER_PAETH) 2001 2002 /* Filter values (not flags) - used in pngwrite.c, pngwutil.c for now. 2003 * These defines should NOT be changed. 2004 */ 2005 #define PNG_FILTER_VALUE_NONE 0 2006 #define PNG_FILTER_VALUE_SUB 1 2007 #define PNG_FILTER_VALUE_UP 2 2008 #define PNG_FILTER_VALUE_AVG 3 2009 #define PNG_FILTER_VALUE_PAETH 4 2010 #define PNG_FILTER_VALUE_LAST 5 2011 2012 #if defined(PNG_WRITE_WEIGHTED_FILTER_SUPPORTED) /* EXPERIMENTAL */ 2013 /* The "heuristic_method" is given by one of the PNG_FILTER_HEURISTIC_ 2014 * defines, either the default (minimum-sum-of-absolute-differences), or 2015 * the experimental method (weighted-minimum-sum-of-absolute-differences). 2016 * 2017 * Weights are factors >= 1.0, indicating how important it is to keep the 2018 * filter type consistent between rows. Larger numbers mean the current 2019 * filter is that many times as likely to be the same as the "num_weights" 2020 * previous filters. This is cumulative for each previous row with a weight. 2021 * There needs to be "num_weights" values in "filter_weights", or it can be 2022 * NULL if the weights aren't being specified. Weights have no influence on 2023 * the selection of the first row filter. Well chosen weights can (in theory) 2024 * improve the compression for a given image. 2025 * 2026 * Costs are factors >= 1.0 indicating the relative decoding costs of a 2027 * filter type. Higher costs indicate more decoding expense, and are 2028 * therefore less likely to be selected over a filter with lower computational 2029 * costs. There needs to be a value in "filter_costs" for each valid filter 2030 * type (given by PNG_FILTER_VALUE_LAST), or it can be NULL if you aren't 2031 * setting the costs. Costs try to improve the speed of decompression without 2032 * unduly increasing the compressed image size. 2033 * 2034 * A negative weight or cost indicates the default value is to be used, and 2035 * values in the range [0.0, 1.0) indicate the value is to remain unchanged. 2036 * The default values for both weights and costs are currently 1.0, but may 2037 * change if good general weighting/cost heuristics can be found. If both 2038 * the weights and costs are set to 1.0, this degenerates the WEIGHTED method 2039 * to the UNWEIGHTED method, but with added encoding time/computation. 2040 */ 2041 #ifdef PNG_FLOATING_POINT_SUPPORTED 2042 extern PNG_EXPORT(void,png_set_filter_heuristics) PNGARG((png_structp png_ptr, 2043 int heuristic_method, int num_weights, png_doublep filter_weights, 2044 png_doublep filter_costs)); 2045 #endif 2046 #endif /* PNG_WRITE_WEIGHTED_FILTER_SUPPORTED */ 2047 2048 /* Heuristic used for row filter selection. These defines should NOT be 2049 * changed. 2050 */ 2051 #define PNG_FILTER_HEURISTIC_DEFAULT 0 /* Currently "UNWEIGHTED" */ 2052 #define PNG_FILTER_HEURISTIC_UNWEIGHTED 1 /* Used by libpng < 0.95 */ 2053 #define PNG_FILTER_HEURISTIC_WEIGHTED 2 /* Experimental feature */ 2054 #define PNG_FILTER_HEURISTIC_LAST 3 /* Not a valid value */ 2055 2056 /* Set the library compression level. Currently, valid values range from 2057 * 0 - 9, corresponding directly to the zlib compression levels 0 - 9 2058 * (0 - no compression, 9 - "maximal" compression). Note that tests have 2059 * shown that zlib compression levels 3-6 usually perform as well as level 9 2060 * for PNG images, and do considerably fewer caclulations. In the future, 2061 * these values may not correspond directly to the zlib compression levels. 2062 */ 2063 extern PNG_EXPORT(void,png_set_compression_level) PNGARG((png_structp png_ptr, 2064 int level)); 2065 2066 extern PNG_EXPORT(void,png_set_compression_mem_level) 2067 PNGARG((png_structp png_ptr, int mem_level)); 2068 2069 extern PNG_EXPORT(void,png_set_compression_strategy) 2070 PNGARG((png_structp png_ptr, int strategy)); 2071 2072 extern PNG_EXPORT(void,png_set_compression_window_bits) 2073 PNGARG((png_structp png_ptr, int window_bits)); 2074 2075 extern PNG_EXPORT(void,png_set_compression_method) PNGARG((png_structp png_ptr, 2076 int method)); 2077 2078 /* These next functions are called for input/output, memory, and error 2079 * handling. They are in the file pngrio.c, pngwio.c, and pngerror.c, 2080 * and call standard C I/O routines such as fread(), fwrite(), and 2081 * fprintf(). These functions can be made to use other I/O routines 2082 * at run time for those applications that need to handle I/O in a 2083 * different manner by calling png_set_???_fn(). See libpng.txt for 2084 * more information. 2085 */ 2086 2087 #ifdef PNG_STDIO_SUPPORTED 2088 /* Initialize the input/output for the PNG file to the default functions. */ 2089 extern PNG_EXPORT(void,png_init_io) PNGARG((png_structp png_ptr, png_FILE_p fp)); 2090 #endif 2091 2092 /* Replace the (error and abort), and warning functions with user 2093 * supplied functions. If no messages are to be printed you must still 2094 * write and use replacement functions. The replacement error_fn should 2095 * still do a longjmp to the last setjmp location if you are using this 2096 * method of error handling. If error_fn or warning_fn is NULL, the 2097 * default function will be used. 2098 */ 2099 2100 extern PNG_EXPORT(void,png_set_error_fn) PNGARG((png_structp png_ptr, 2101 png_voidp error_ptr, png_error_ptr error_fn, png_error_ptr warning_fn)); 2102 2103 /* Return the user pointer associated with the error functions */ 2104 extern PNG_EXPORT(png_voidp,png_get_error_ptr) PNGARG((png_structp png_ptr)); 2105 2106 /* Replace the default data output functions with a user supplied one(s). 2107 * If buffered output is not used, then output_flush_fn can be set to NULL. 2108 * If PNG_WRITE_FLUSH_SUPPORTED is not defined at libpng compile time 2109 * output_flush_fn will be ignored (and thus can be NULL). 2110 * It is probably a mistake to use NULL for output_flush_fn if 2111 * write_data_fn is not also NULL unless you have built libpng with 2112 * PNG_WRITE_FLUSH_SUPPORTED undefined, because in this case libpng's 2113 * default flush function, which uses the standard *FILE structure, will 2114 * be used. 2115 */ 2116 extern PNG_EXPORT(void,png_set_write_fn) PNGARG((png_structp png_ptr, 2117 png_voidp io_ptr, png_rw_ptr write_data_fn, png_flush_ptr output_flush_fn)); 2118 2119 /* Replace the default data input function with a user supplied one. */ 2120 extern PNG_EXPORT(void,png_set_read_fn) PNGARG((png_structp png_ptr, 2121 png_voidp io_ptr, png_rw_ptr read_data_fn)); 2122 2123 #ifdef PNG_INDEX_SUPPORTED 2124 /* Set the data seek function with a user supplied one. 2125 * REQUIRED by partial image decode. 2126 */ 2127 extern PNG_EXPORT(void,png_set_seek_fn) PNGARG((png_structp png_ptr, 2128 png_seek_ptr seek_data_fn)); 2129 #endif 2130 2131 /* Return the user pointer associated with the I/O functions */ 2132 extern PNG_EXPORT(png_voidp,png_get_io_ptr) PNGARG((png_structp png_ptr)); 2133 2134 extern PNG_EXPORT(void,png_set_read_status_fn) PNGARG((png_structp png_ptr, 2135 png_read_status_ptr read_row_fn)); 2136 2137 extern PNG_EXPORT(void,png_set_write_status_fn) PNGARG((png_structp png_ptr, 2138 png_write_status_ptr write_row_fn)); 2139 2140 #ifdef PNG_USER_MEM_SUPPORTED 2141 /* Replace the default memory allocation functions with user supplied one(s). */ 2142 extern PNG_EXPORT(void,png_set_mem_fn) PNGARG((png_structp png_ptr, 2143 png_voidp mem_ptr, png_malloc_ptr malloc_fn, png_free_ptr free_fn)); 2144 /* Return the user pointer associated with the memory functions */ 2145 extern PNG_EXPORT(png_voidp,png_get_mem_ptr) PNGARG((png_structp png_ptr)); 2146 #endif 2147 2148 #if defined(PNG_READ_USER_TRANSFORM_SUPPORTED) || \ 2149 defined(PNG_LEGACY_SUPPORTED) 2150 extern PNG_EXPORT(void,png_set_read_user_transform_fn) PNGARG((png_structp 2151 png_ptr, png_user_transform_ptr read_user_transform_fn)); 2152 #endif 2153 2154 #if defined(PNG_WRITE_USER_TRANSFORM_SUPPORTED) || \ 2155 defined(PNG_LEGACY_SUPPORTED) 2156 extern PNG_EXPORT(void,png_set_write_user_transform_fn) PNGARG((png_structp 2157 png_ptr, png_user_transform_ptr write_user_transform_fn)); 2158 #endif 2159 2160 #if defined(PNG_READ_USER_TRANSFORM_SUPPORTED) || \ 2161 defined(PNG_WRITE_USER_TRANSFORM_SUPPORTED) || \ 2162 defined(PNG_LEGACY_SUPPORTED) 2163 extern PNG_EXPORT(void,png_set_user_transform_info) PNGARG((png_structp 2164 png_ptr, png_voidp user_transform_ptr, int user_transform_depth, 2165 int user_transform_channels)); 2166 /* Return the user pointer associated with the user transform functions */ 2167 extern PNG_EXPORT(png_voidp,png_get_user_transform_ptr) 2168 PNGARG((png_structp png_ptr)); 2169 #endif 2170 2171 #ifdef PNG_USER_CHUNKS_SUPPORTED 2172 extern PNG_EXPORT(void,png_set_read_user_chunk_fn) PNGARG((png_structp png_ptr, 2173 png_voidp user_chunk_ptr, png_user_chunk_ptr read_user_chunk_fn)); 2174 extern PNG_EXPORT(png_voidp,png_get_user_chunk_ptr) PNGARG((png_structp 2175 png_ptr)); 2176 #endif 2177 2178 #ifdef PNG_PROGRESSIVE_READ_SUPPORTED 2179 /* Sets the function callbacks for the push reader, and a pointer to a 2180 * user-defined structure available to the callback functions. 2181 */ 2182 extern PNG_EXPORT(void,png_set_progressive_read_fn) PNGARG((png_structp png_ptr, 2183 png_voidp progressive_ptr, 2184 png_progressive_info_ptr info_fn, png_progressive_row_ptr row_fn, 2185 png_progressive_end_ptr end_fn)); 2186 2187 /* Returns the user pointer associated with the push read functions */ 2188 extern PNG_EXPORT(png_voidp,png_get_progressive_ptr) 2189 PNGARG((png_structp png_ptr)); 2190 2191 /* Function to be called when data becomes available */ 2192 extern PNG_EXPORT(void,png_process_data) PNGARG((png_structp png_ptr, 2193 png_infop info_ptr, png_bytep buffer, png_size_t buffer_size)); 2194 2195 /* Function that combines rows. Not very much different than the 2196 * png_combine_row() call. Is this even used????? 2197 */ 2198 extern PNG_EXPORT(void,png_progressive_combine_row) PNGARG((png_structp png_ptr, 2199 png_bytep old_row, png_bytep new_row)); 2200 #endif /* PNG_PROGRESSIVE_READ_SUPPORTED */ 2201 2202 extern PNG_EXPORT(png_voidp,png_malloc) PNGARG((png_structp png_ptr, 2203 png_uint_32 size)) PNG_ALLOCATED; 2204 2205 #ifdef PNG_1_0_X 2206 # define png_malloc_warn png_malloc 2207 #else 2208 /* Added at libpng version 1.2.4 */ 2209 extern PNG_EXPORT(png_voidp,png_malloc_warn) PNGARG((png_structp png_ptr, 2210 png_uint_32 size)) PNG_ALLOCATED; 2211 #endif 2212 2213 /* Frees a pointer allocated by png_malloc() */ 2214 extern PNG_EXPORT(void,png_free) PNGARG((png_structp png_ptr, png_voidp ptr)); 2215 2216 #ifdef PNG_1_0_X 2217 /* Function to allocate memory for zlib. */ 2218 extern PNG_EXPORT(voidpf,png_zalloc) PNGARG((voidpf png_ptr, uInt items, 2219 uInt size)); 2220 2221 /* Function to free memory for zlib */ 2222 extern PNG_EXPORT(void,png_zfree) PNGARG((voidpf png_ptr, voidpf ptr)); 2223 #endif 2224 2225 /* Free data that was allocated internally */ 2226 extern PNG_EXPORT(void,png_free_data) PNGARG((png_structp png_ptr, 2227 png_infop info_ptr, png_uint_32 free_me, int num)); 2228 #ifdef PNG_FREE_ME_SUPPORTED 2229 /* Reassign responsibility for freeing existing data, whether allocated 2230 * by libpng or by the application 2231 */ 2232 extern PNG_EXPORT(void,png_data_freer) PNGARG((png_structp png_ptr, 2233 png_infop info_ptr, int freer, png_uint_32 mask)); 2234 #endif 2235 /* Assignments for png_data_freer */ 2236 #define PNG_DESTROY_WILL_FREE_DATA 1 2237 #define PNG_SET_WILL_FREE_DATA 1 2238 #define PNG_USER_WILL_FREE_DATA 2 2239 /* Flags for png_ptr->free_me and info_ptr->free_me */ 2240 #define PNG_FREE_HIST 0x0008 2241 #define PNG_FREE_ICCP 0x0010 2242 #define PNG_FREE_SPLT 0x0020 2243 #define PNG_FREE_ROWS 0x0040 2244 #define PNG_FREE_PCAL 0x0080 2245 #define PNG_FREE_SCAL 0x0100 2246 #define PNG_FREE_UNKN 0x0200 2247 #define PNG_FREE_LIST 0x0400 2248 #define PNG_FREE_PLTE 0x1000 2249 #define PNG_FREE_TRNS 0x2000 2250 #define PNG_FREE_TEXT 0x4000 2251 #define PNG_FREE_ALL 0x7fff 2252 #define PNG_FREE_MUL 0x4220 /* PNG_FREE_SPLT|PNG_FREE_TEXT|PNG_FREE_UNKN */ 2253 2254 #ifdef PNG_USER_MEM_SUPPORTED 2255 extern PNG_EXPORT(png_voidp,png_malloc_default) PNGARG((png_structp png_ptr, 2256 png_uint_32 size)) PNG_ALLOCATED; 2257 extern PNG_EXPORT(void,png_free_default) PNGARG((png_structp png_ptr, 2258 png_voidp ptr)); 2259 #endif 2260 2261 extern PNG_EXPORT(png_voidp,png_memcpy_check) PNGARG((png_structp png_ptr, 2262 png_voidp s1, png_voidp s2, png_uint_32 size)) PNG_DEPRECATED; 2263 2264 extern PNG_EXPORT(png_voidp,png_memset_check) PNGARG((png_structp png_ptr, 2265 png_voidp s1, int value, png_uint_32 size)) PNG_DEPRECATED; 2266 2267 #if defined(USE_FAR_KEYWORD) /* memory model conversion function */ 2268 extern void *png_far_to_near PNGARG((png_structp png_ptr,png_voidp ptr, 2269 int check)); 2270 #endif /* USE_FAR_KEYWORD */ 2271 2272 #ifndef PNG_NO_ERROR_TEXT 2273 /* Fatal error in PNG image of libpng - can't continue */ 2274 extern PNG_EXPORT(void,png_error) PNGARG((png_structp png_ptr, 2275 png_const_charp error_message)) PNG_NORETURN; 2276 2277 /* The same, but the chunk name is prepended to the error string. */ 2278 extern PNG_EXPORT(void,png_chunk_error) PNGARG((png_structp png_ptr, 2279 png_const_charp error_message)) PNG_NORETURN; 2280 #else 2281 /* Fatal error in PNG image of libpng - can't continue */ 2282 extern PNG_EXPORT(void,png_err) PNGARG((png_structp png_ptr)) PNG_NORETURN; 2283 #endif 2284 2285 #ifndef PNG_NO_WARNINGS 2286 /* Non-fatal error in libpng. Can continue, but may have a problem. */ 2287 extern PNG_EXPORT(void,png_warning) PNGARG((png_structp png_ptr, 2288 png_const_charp warning_message)); 2289 2290 #ifdef PNG_READ_SUPPORTED 2291 /* Non-fatal error in libpng, chunk name is prepended to message. */ 2292 extern PNG_EXPORT(void,png_chunk_warning) PNGARG((png_structp png_ptr, 2293 png_const_charp warning_message)); 2294 #endif /* PNG_READ_SUPPORTED */ 2295 #endif /* PNG_NO_WARNINGS */ 2296 2297 /* The png_set_<chunk> functions are for storing values in the png_info_struct. 2298 * Similarly, the png_get_<chunk> calls are used to read values from the 2299 * png_info_struct, either storing the parameters in the passed variables, or 2300 * setting pointers into the png_info_struct where the data is stored. The 2301 * png_get_<chunk> functions return a non-zero value if the data was available 2302 * in info_ptr, or return zero and do not change any of the parameters if the 2303 * data was not available. 2304 * 2305 * These functions should be used instead of directly accessing png_info 2306 * to avoid problems with future changes in the size and internal layout of 2307 * png_info_struct. 2308 */ 2309 /* Returns "flag" if chunk data is valid in info_ptr. */ 2310 extern PNG_EXPORT(png_uint_32,png_get_valid) PNGARG((png_structp png_ptr, 2311 png_infop info_ptr, png_uint_32 flag)); 2312 2313 /* Returns number of bytes needed to hold a transformed row. */ 2314 extern PNG_EXPORT(png_uint_32,png_get_rowbytes) PNGARG((png_structp png_ptr, 2315 png_infop info_ptr)); 2316 2317 #ifdef PNG_INFO_IMAGE_SUPPORTED 2318 /* Returns row_pointers, which is an array of pointers to scanlines that was 2319 * returned from png_read_png(). 2320 */ 2321 extern PNG_EXPORT(png_bytepp,png_get_rows) PNGARG((png_structp png_ptr, 2322 png_infop info_ptr)); 2323 /* Set row_pointers, which is an array of pointers to scanlines for use 2324 * by png_write_png(). 2325 */ 2326 extern PNG_EXPORT(void,png_set_rows) PNGARG((png_structp png_ptr, 2327 png_infop info_ptr, png_bytepp row_pointers)); 2328 #endif 2329 2330 /* Returns number of color channels in image. */ 2331 extern PNG_EXPORT(png_byte,png_get_channels) PNGARG((png_structp png_ptr, 2332 png_infop info_ptr)); 2333 2334 #ifdef PNG_EASY_ACCESS_SUPPORTED 2335 /* Returns image width in pixels. */ 2336 extern PNG_EXPORT(png_uint_32, png_get_image_width) PNGARG((png_structp 2337 png_ptr, png_infop info_ptr)); 2338 2339 /* Returns image height in pixels. */ 2340 extern PNG_EXPORT(png_uint_32, png_get_image_height) PNGARG((png_structp 2341 png_ptr, png_infop info_ptr)); 2342 2343 /* Returns image bit_depth. */ 2344 extern PNG_EXPORT(png_byte, png_get_bit_depth) PNGARG((png_structp 2345 png_ptr, png_infop info_ptr)); 2346 2347 /* Returns image color_type. */ 2348 extern PNG_EXPORT(png_byte, png_get_color_type) PNGARG((png_structp 2349 png_ptr, png_infop info_ptr)); 2350 2351 /* Returns image filter_type. */ 2352 extern PNG_EXPORT(png_byte, png_get_filter_type) PNGARG((png_structp 2353 png_ptr, png_infop info_ptr)); 2354 2355 /* Returns image interlace_type. */ 2356 extern PNG_EXPORT(png_byte, png_get_interlace_type) PNGARG((png_structp 2357 png_ptr, png_infop info_ptr)); 2358 2359 /* Returns image compression_type. */ 2360 extern PNG_EXPORT(png_byte, png_get_compression_type) PNGARG((png_structp 2361 png_ptr, png_infop info_ptr)); 2362 2363 /* Returns image resolution in pixels per meter, from pHYs chunk data. */ 2364 extern PNG_EXPORT(png_uint_32, png_get_pixels_per_meter) PNGARG((png_structp 2365 png_ptr, png_infop info_ptr)); 2366 extern PNG_EXPORT(png_uint_32, png_get_x_pixels_per_meter) PNGARG((png_structp 2367 png_ptr, png_infop info_ptr)); 2368 extern PNG_EXPORT(png_uint_32, png_get_y_pixels_per_meter) PNGARG((png_structp 2369 png_ptr, png_infop info_ptr)); 2370 2371 /* Returns pixel aspect ratio, computed from pHYs chunk data. */ 2372 #ifdef PNG_FLOATING_POINT_SUPPORTED 2373 extern PNG_EXPORT(float, png_get_pixel_aspect_ratio) PNGARG((png_structp 2374 png_ptr, png_infop info_ptr)); 2375 #endif 2376 2377 /* Returns image x, y offset in pixels or microns, from oFFs chunk data. */ 2378 extern PNG_EXPORT(png_int_32, png_get_x_offset_pixels) PNGARG((png_structp 2379 png_ptr, png_infop info_ptr)); 2380 extern PNG_EXPORT(png_int_32, png_get_y_offset_pixels) PNGARG((png_structp 2381 png_ptr, png_infop info_ptr)); 2382 extern PNG_EXPORT(png_int_32, png_get_x_offset_microns) PNGARG((png_structp 2383 png_ptr, png_infop info_ptr)); 2384 extern PNG_EXPORT(png_int_32, png_get_y_offset_microns) PNGARG((png_structp 2385 png_ptr, png_infop info_ptr)); 2386 2387 #endif /* PNG_EASY_ACCESS_SUPPORTED */ 2388 2389 /* Returns pointer to signature string read from PNG header */ 2390 extern PNG_EXPORT(png_bytep,png_get_signature) PNGARG((png_structp png_ptr, 2391 png_infop info_ptr)); 2392 2393 #ifdef PNG_bKGD_SUPPORTED 2394 extern PNG_EXPORT(png_uint_32,png_get_bKGD) PNGARG((png_structp png_ptr, 2395 png_infop info_ptr, png_color_16p *background)); 2396 #endif 2397 2398 #ifdef PNG_bKGD_SUPPORTED 2399 extern PNG_EXPORT(void,png_set_bKGD) PNGARG((png_structp png_ptr, 2400 png_infop info_ptr, png_color_16p background)); 2401 #endif 2402 2403 #ifdef PNG_cHRM_SUPPORTED 2404 #ifdef PNG_FLOATING_POINT_SUPPORTED 2405 extern PNG_EXPORT(png_uint_32,png_get_cHRM) PNGARG((png_structp png_ptr, 2406 png_infop info_ptr, double *white_x, double *white_y, double *red_x, 2407 double *red_y, double *green_x, double *green_y, double *blue_x, 2408 double *blue_y)); 2409 #endif 2410 #ifdef PNG_FIXED_POINT_SUPPORTED 2411 extern PNG_EXPORT(png_uint_32,png_get_cHRM_fixed) PNGARG((png_structp png_ptr, 2412 png_infop info_ptr, png_fixed_point *int_white_x, png_fixed_point 2413 *int_white_y, png_fixed_point *int_red_x, png_fixed_point *int_red_y, 2414 png_fixed_point *int_green_x, png_fixed_point *int_green_y, png_fixed_point 2415 *int_blue_x, png_fixed_point *int_blue_y)); 2416 #endif 2417 #endif 2418 2419 #ifdef PNG_cHRM_SUPPORTED 2420 #ifdef PNG_FLOATING_POINT_SUPPORTED 2421 extern PNG_EXPORT(void,png_set_cHRM) PNGARG((png_structp png_ptr, 2422 png_infop info_ptr, double white_x, double white_y, double red_x, 2423 double red_y, double green_x, double green_y, double blue_x, double blue_y)); 2424 #endif 2425 #ifdef PNG_FIXED_POINT_SUPPORTED 2426 extern PNG_EXPORT(void,png_set_cHRM_fixed) PNGARG((png_structp png_ptr, 2427 png_infop info_ptr, png_fixed_point int_white_x, png_fixed_point int_white_y, 2428 png_fixed_point int_red_x, png_fixed_point int_red_y, png_fixed_point 2429 int_green_x, png_fixed_point int_green_y, png_fixed_point int_blue_x, 2430 png_fixed_point int_blue_y)); 2431 #endif 2432 #endif 2433 2434 #ifdef PNG_gAMA_SUPPORTED 2435 #ifdef PNG_FLOATING_POINT_SUPPORTED 2436 extern PNG_EXPORT(png_uint_32,png_get_gAMA) PNGARG((png_structp png_ptr, 2437 png_infop info_ptr, double *file_gamma)); 2438 #endif 2439 extern PNG_EXPORT(png_uint_32,png_get_gAMA_fixed) PNGARG((png_structp png_ptr, 2440 png_infop info_ptr, png_fixed_point *int_file_gamma)); 2441 #endif 2442 2443 #ifdef PNG_gAMA_SUPPORTED 2444 #ifdef PNG_FLOATING_POINT_SUPPORTED 2445 extern PNG_EXPORT(void,png_set_gAMA) PNGARG((png_structp png_ptr, 2446 png_infop info_ptr, double file_gamma)); 2447 #endif 2448 extern PNG_EXPORT(void,png_set_gAMA_fixed) PNGARG((png_structp png_ptr, 2449 png_infop info_ptr, png_fixed_point int_file_gamma)); 2450 #endif 2451 2452 #ifdef PNG_hIST_SUPPORTED 2453 extern PNG_EXPORT(png_uint_32,png_get_hIST) PNGARG((png_structp png_ptr, 2454 png_infop info_ptr, png_uint_16p *hist)); 2455 #endif 2456 2457 #ifdef PNG_hIST_SUPPORTED 2458 extern PNG_EXPORT(void,png_set_hIST) PNGARG((png_structp png_ptr, 2459 png_infop info_ptr, png_uint_16p hist)); 2460 #endif 2461 2462 extern PNG_EXPORT(png_uint_32,png_get_IHDR) PNGARG((png_structp png_ptr, 2463 png_infop info_ptr, png_uint_32 *width, png_uint_32 *height, 2464 int *bit_depth, int *color_type, int *interlace_method, 2465 int *compression_method, int *filter_method)); 2466 2467 extern PNG_EXPORT(void,png_set_IHDR) PNGARG((png_structp png_ptr, 2468 png_infop info_ptr, png_uint_32 width, png_uint_32 height, int bit_depth, 2469 int color_type, int interlace_method, int compression_method, 2470 int filter_method)); 2471 2472 #ifdef PNG_oFFs_SUPPORTED 2473 extern PNG_EXPORT(png_uint_32,png_get_oFFs) PNGARG((png_structp png_ptr, 2474 png_infop info_ptr, png_int_32 *offset_x, png_int_32 *offset_y, 2475 int *unit_type)); 2476 #endif 2477 2478 #ifdef PNG_oFFs_SUPPORTED 2479 extern PNG_EXPORT(void,png_set_oFFs) PNGARG((png_structp png_ptr, 2480 png_infop info_ptr, png_int_32 offset_x, png_int_32 offset_y, 2481 int unit_type)); 2482 #endif 2483 2484 #ifdef PNG_pCAL_SUPPORTED 2485 extern PNG_EXPORT(png_uint_32,png_get_pCAL) PNGARG((png_structp png_ptr, 2486 png_infop info_ptr, png_charp *purpose, png_int_32 *X0, png_int_32 *X1, 2487 int *type, int *nparams, png_charp *units, png_charpp *params)); 2488 #endif 2489 2490 #ifdef PNG_pCAL_SUPPORTED 2491 extern PNG_EXPORT(void,png_set_pCAL) PNGARG((png_structp png_ptr, 2492 png_infop info_ptr, png_charp purpose, png_int_32 X0, png_int_32 X1, 2493 int type, int nparams, png_charp units, png_charpp params)); 2494 #endif 2495 2496 #ifdef PNG_pHYs_SUPPORTED 2497 extern PNG_EXPORT(png_uint_32,png_get_pHYs) PNGARG((png_structp png_ptr, 2498 png_infop info_ptr, png_uint_32 *res_x, png_uint_32 *res_y, int *unit_type)); 2499 #endif 2500 2501 #ifdef PNG_pHYs_SUPPORTED 2502 extern PNG_EXPORT(void,png_set_pHYs) PNGARG((png_structp png_ptr, 2503 png_infop info_ptr, png_uint_32 res_x, png_uint_32 res_y, int unit_type)); 2504 #endif 2505 2506 extern PNG_EXPORT(png_uint_32,png_get_PLTE) PNGARG((png_structp png_ptr, 2507 png_infop info_ptr, png_colorp *palette, int *num_palette)); 2508 2509 extern PNG_EXPORT(void,png_set_PLTE) PNGARG((png_structp png_ptr, 2510 png_infop info_ptr, png_colorp palette, int num_palette)); 2511 2512 #ifdef PNG_sBIT_SUPPORTED 2513 extern PNG_EXPORT(png_uint_32,png_get_sBIT) PNGARG((png_structp png_ptr, 2514 png_infop info_ptr, png_color_8p *sig_bit)); 2515 #endif 2516 2517 #ifdef PNG_sBIT_SUPPORTED 2518 extern PNG_EXPORT(void,png_set_sBIT) PNGARG((png_structp png_ptr, 2519 png_infop info_ptr, png_color_8p sig_bit)); 2520 #endif 2521 2522 #ifdef PNG_sRGB_SUPPORTED 2523 extern PNG_EXPORT(png_uint_32,png_get_sRGB) PNGARG((png_structp png_ptr, 2524 png_infop info_ptr, int *intent)); 2525 #endif 2526 2527 #ifdef PNG_sRGB_SUPPORTED 2528 extern PNG_EXPORT(void,png_set_sRGB) PNGARG((png_structp png_ptr, 2529 png_infop info_ptr, int intent)); 2530 extern PNG_EXPORT(void,png_set_sRGB_gAMA_and_cHRM) PNGARG((png_structp png_ptr, 2531 png_infop info_ptr, int intent)); 2532 #endif 2533 2534 #ifdef PNG_iCCP_SUPPORTED 2535 extern PNG_EXPORT(png_uint_32,png_get_iCCP) PNGARG((png_structp png_ptr, 2536 png_infop info_ptr, png_charpp name, int *compression_type, 2537 png_charpp profile, png_uint_32 *proflen)); 2538 /* Note to maintainer: profile should be png_bytepp */ 2539 #endif 2540 2541 #ifdef PNG_iCCP_SUPPORTED 2542 extern PNG_EXPORT(void,png_set_iCCP) PNGARG((png_structp png_ptr, 2543 png_infop info_ptr, png_charp name, int compression_type, 2544 png_charp profile, png_uint_32 proflen)); 2545 /* Note to maintainer: profile should be png_bytep */ 2546 #endif 2547 2548 #ifdef PNG_sPLT_SUPPORTED 2549 extern PNG_EXPORT(png_uint_32,png_get_sPLT) PNGARG((png_structp png_ptr, 2550 png_infop info_ptr, png_sPLT_tpp entries)); 2551 #endif 2552 2553 #ifdef PNG_sPLT_SUPPORTED 2554 extern PNG_EXPORT(void,png_set_sPLT) PNGARG((png_structp png_ptr, 2555 png_infop info_ptr, png_sPLT_tp entries, int nentries)); 2556 #endif 2557 2558 #ifdef PNG_TEXT_SUPPORTED 2559 /* png_get_text also returns the number of text chunks in *num_text */ 2560 extern PNG_EXPORT(png_uint_32,png_get_text) PNGARG((png_structp png_ptr, 2561 png_infop info_ptr, png_textp *text_ptr, int *num_text)); 2562 #endif 2563 2564 /* 2565 * Note while png_set_text() will accept a structure whose text, 2566 * language, and translated keywords are NULL pointers, the structure 2567 * returned by png_get_text will always contain regular 2568 * zero-terminated C strings. They might be empty strings but 2569 * they will never be NULL pointers. 2570 */ 2571 2572 #ifdef PNG_TEXT_SUPPORTED 2573 extern PNG_EXPORT(void,png_set_text) PNGARG((png_structp png_ptr, 2574 png_infop info_ptr, png_textp text_ptr, int num_text)); 2575 #endif 2576 2577 #ifdef PNG_tIME_SUPPORTED 2578 extern PNG_EXPORT(png_uint_32,png_get_tIME) PNGARG((png_structp png_ptr, 2579 png_infop info_ptr, png_timep *mod_time)); 2580 #endif 2581 2582 #ifdef PNG_tIME_SUPPORTED 2583 extern PNG_EXPORT(void,png_set_tIME) PNGARG((png_structp png_ptr, 2584 png_infop info_ptr, png_timep mod_time)); 2585 #endif 2586 2587 #ifdef PNG_tRNS_SUPPORTED 2588 extern PNG_EXPORT(png_uint_32,png_get_tRNS) PNGARG((png_structp png_ptr, 2589 png_infop info_ptr, png_bytep *trans, int *num_trans, 2590 png_color_16p *trans_values)); 2591 #endif 2592 2593 #ifdef PNG_tRNS_SUPPORTED 2594 extern PNG_EXPORT(void,png_set_tRNS) PNGARG((png_structp png_ptr, 2595 png_infop info_ptr, png_bytep trans, int num_trans, 2596 png_color_16p trans_values)); 2597 #endif 2598 2599 #ifdef PNG_tRNS_SUPPORTED 2600 #endif 2601 2602 #ifdef PNG_sCAL_SUPPORTED 2603 #ifdef PNG_FLOATING_POINT_SUPPORTED 2604 extern PNG_EXPORT(png_uint_32,png_get_sCAL) PNGARG((png_structp png_ptr, 2605 png_infop info_ptr, int *unit, double *width, double *height)); 2606 #else 2607 #ifdef PNG_FIXED_POINT_SUPPORTED 2608 extern PNG_EXPORT(png_uint_32,png_get_sCAL_s) PNGARG((png_structp png_ptr, 2609 png_infop info_ptr, int *unit, png_charpp swidth, png_charpp sheight)); 2610 #endif 2611 #endif 2612 #endif /* PNG_sCAL_SUPPORTED */ 2613 2614 #ifdef PNG_sCAL_SUPPORTED 2615 #ifdef PNG_FLOATING_POINT_SUPPORTED 2616 extern PNG_EXPORT(void,png_set_sCAL) PNGARG((png_structp png_ptr, 2617 png_infop info_ptr, int unit, double width, double height)); 2618 #else 2619 #ifdef PNG_FIXED_POINT_SUPPORTED 2620 extern PNG_EXPORT(void,png_set_sCAL_s) PNGARG((png_structp png_ptr, 2621 png_infop info_ptr, int unit, png_charp swidth, png_charp sheight)); 2622 #endif 2623 #endif 2624 #endif /* PNG_sCAL_SUPPORTED || PNG_WRITE_sCAL_SUPPORTED */ 2625 2626 #ifdef PNG_HANDLE_AS_UNKNOWN_SUPPORTED 2627 /* Provide a list of chunks and how they are to be handled, if the built-in 2628 handling or default unknown chunk handling is not desired. Any chunks not 2629 listed will be handled in the default manner. The IHDR and IEND chunks 2630 must not be listed. 2631 keep = 0: follow default behaviour 2632 = 1: do not keep 2633 = 2: keep only if safe-to-copy 2634 = 3: keep even if unsafe-to-copy 2635 */ 2636 extern PNG_EXPORT(void, png_set_keep_unknown_chunks) PNGARG((png_structp 2637 png_ptr, int keep, png_bytep chunk_list, int num_chunks)); 2638 PNG_EXPORT(int,png_handle_as_unknown) PNGARG((png_structp png_ptr, png_bytep 2639 chunk_name)); 2640 #endif 2641 #ifdef PNG_UNKNOWN_CHUNKS_SUPPORTED 2642 extern PNG_EXPORT(void, png_set_unknown_chunks) PNGARG((png_structp png_ptr, 2643 png_infop info_ptr, png_unknown_chunkp unknowns, int num_unknowns)); 2644 extern PNG_EXPORT(void, png_set_unknown_chunk_location) 2645 PNGARG((png_structp png_ptr, png_infop info_ptr, int chunk, int location)); 2646 extern PNG_EXPORT(png_uint_32,png_get_unknown_chunks) PNGARG((png_structp 2647 png_ptr, png_infop info_ptr, png_unknown_chunkpp entries)); 2648 #endif 2649 2650 /* Png_free_data() will turn off the "valid" flag for anything it frees. 2651 * If you need to turn it off for a chunk that your application has freed, 2652 * you can use png_set_invalid(png_ptr, info_ptr, PNG_INFO_CHNK); 2653 */ 2654 extern PNG_EXPORT(void, png_set_invalid) PNGARG((png_structp png_ptr, 2655 png_infop info_ptr, int mask)); 2656 2657 #ifdef PNG_INFO_IMAGE_SUPPORTED 2658 /* The "params" pointer is currently not used and is for future expansion. */ 2659 extern PNG_EXPORT(void, png_read_png) PNGARG((png_structp png_ptr, 2660 png_infop info_ptr, 2661 int transforms, 2662 png_voidp params)); 2663 extern PNG_EXPORT(void, png_write_png) PNGARG((png_structp png_ptr, 2664 png_infop info_ptr, 2665 int transforms, 2666 png_voidp params)); 2667 #endif 2668 2669 /* Define PNG_DEBUG at compile time for debugging information. Higher 2670 * numbers for PNG_DEBUG mean more debugging information. This has 2671 * only been added since version 0.95 so it is not implemented throughout 2672 * libpng yet, but more support will be added as needed. 2673 */ 2674 #ifdef PNG_DEBUG 2675 #if (PNG_DEBUG > 0) 2676 #if !defined(PNG_DEBUG_FILE) && defined(_MSC_VER) 2677 #include <crtdbg.h> 2678 #if (PNG_DEBUG > 1) 2679 #ifndef _DEBUG 2680 # define _DEBUG 2681 #endif 2682 #ifndef png_debug 2683 #define png_debug(l,m) _RPT0(_CRT_WARN,m PNG_STRING_NEWLINE) 2684 #endif 2685 #ifndef png_debug1 2686 #define png_debug1(l,m,p1) _RPT1(_CRT_WARN,m PNG_STRING_NEWLINE,p1) 2687 #endif 2688 #ifndef png_debug2 2689 #define png_debug2(l,m,p1,p2) _RPT2(_CRT_WARN,m PNG_STRING_NEWLINE,p1,p2) 2690 #endif 2691 #endif 2692 #else /* PNG_DEBUG_FILE || !_MSC_VER */ 2693 #ifndef PNG_DEBUG_FILE 2694 #define PNG_DEBUG_FILE stderr 2695 #endif /* PNG_DEBUG_FILE */ 2696 2697 #if (PNG_DEBUG > 1) 2698 /* Note: ["%s"m PNG_STRING_NEWLINE] probably does not work on non-ISO 2699 * compilers. 2700 */ 2701 # ifdef __STDC__ 2702 # ifndef png_debug 2703 # define png_debug(l,m) \ 2704 { \ 2705 int num_tabs=l; \ 2706 fprintf(PNG_DEBUG_FILE,"%s"m PNG_STRING_NEWLINE,(num_tabs==1 ? "\t" : \ 2707 (num_tabs==2 ? "\t\t":(num_tabs>2 ? "\t\t\t":"")))); \ 2708 } 2709 # endif 2710 # ifndef png_debug1 2711 # define png_debug1(l,m,p1) \ 2712 { \ 2713 int num_tabs=l; \ 2714 fprintf(PNG_DEBUG_FILE,"%s"m PNG_STRING_NEWLINE,(num_tabs==1 ? "\t" : \ 2715 (num_tabs==2 ? "\t\t":(num_tabs>2 ? "\t\t\t":""))),p1); \ 2716 } 2717 # endif 2718 # ifndef png_debug2 2719 # define png_debug2(l,m,p1,p2) \ 2720 { \ 2721 int num_tabs=l; \ 2722 fprintf(PNG_DEBUG_FILE,"%s"m PNG_STRING_NEWLINE,(num_tabs==1 ? "\t" : \ 2723 (num_tabs==2 ? "\t\t":(num_tabs>2 ? "\t\t\t":""))),p1,p2); \ 2724 } 2725 # endif 2726 # else /* __STDC __ */ 2727 # ifndef png_debug 2728 # define png_debug(l,m) \ 2729 { \ 2730 int num_tabs=l; \ 2731 char format[256]; \ 2732 snprintf(format,256,"%s%s%s",(num_tabs==1 ? "\t" : \ 2733 (num_tabs==2 ? "\t\t":(num_tabs>2 ? "\t\t\t":""))), \ 2734 m,PNG_STRING_NEWLINE); \ 2735 fprintf(PNG_DEBUG_FILE,format); \ 2736 } 2737 # endif 2738 # ifndef png_debug1 2739 # define png_debug1(l,m,p1) \ 2740 { \ 2741 int num_tabs=l; \ 2742 char format[256]; \ 2743 snprintf(format,256,"%s%s%s",(num_tabs==1 ? "\t" : \ 2744 (num_tabs==2 ? "\t\t":(num_tabs>2 ? "\t\t\t":""))), \ 2745 m,PNG_STRING_NEWLINE); \ 2746 fprintf(PNG_DEBUG_FILE,format,p1); \ 2747 } 2748 # endif 2749 # ifndef png_debug2 2750 # define png_debug2(l,m,p1,p2) \ 2751 { \ 2752 int num_tabs=l; \ 2753 char format[256]; \ 2754 snprintf(format,256,"%s%s%s",(num_tabs==1 ? "\t" : \ 2755 (num_tabs==2 ? "\t\t":(num_tabs>2 ? "\t\t\t":""))), \ 2756 m,PNG_STRING_NEWLINE); \ 2757 fprintf(PNG_DEBUG_FILE,format,p1,p2); \ 2758 } 2759 # endif 2760 # endif /* __STDC __ */ 2761 #endif /* (PNG_DEBUG > 1) */ 2762 2763 #endif /* _MSC_VER */ 2764 #endif /* (PNG_DEBUG > 0) */ 2765 #endif /* PNG_DEBUG */ 2766 #ifndef png_debug 2767 #define png_debug(l, m) 2768 #endif 2769 #ifndef png_debug1 2770 #define png_debug1(l, m, p1) 2771 #endif 2772 #ifndef png_debug2 2773 #define png_debug2(l, m, p1, p2) 2774 #endif 2775 2776 extern PNG_EXPORT(png_charp,png_get_copyright) PNGARG((png_structp png_ptr)); 2777 extern PNG_EXPORT(png_charp,png_get_header_ver) PNGARG((png_structp png_ptr)); 2778 extern PNG_EXPORT(png_charp,png_get_header_version) PNGARG((png_structp png_ptr)); 2779 extern PNG_EXPORT(png_charp,png_get_libpng_ver) PNGARG((png_structp png_ptr)); 2780 2781 #ifdef PNG_MNG_FEATURES_SUPPORTED 2782 extern PNG_EXPORT(png_uint_32,png_permit_mng_features) PNGARG((png_structp 2783 png_ptr, png_uint_32 mng_features_permitted)); 2784 #endif 2785 2786 /* For use in png_set_keep_unknown, added to version 1.2.6 */ 2787 #define PNG_HANDLE_CHUNK_AS_DEFAULT 0 2788 #define PNG_HANDLE_CHUNK_NEVER 1 2789 #define PNG_HANDLE_CHUNK_IF_SAFE 2 2790 #define PNG_HANDLE_CHUNK_ALWAYS 3 2791 2792 /* Added to version 1.2.0 */ 2793 #ifdef PNG_ASSEMBLER_CODE_SUPPORTED 2794 #ifdef PNG_MMX_CODE_SUPPORTED 2795 #define PNG_ASM_FLAG_MMX_SUPPORT_COMPILED 0x01 /* not user-settable */ 2796 #define PNG_ASM_FLAG_MMX_SUPPORT_IN_CPU 0x02 /* not user-settable */ 2797 #define PNG_ASM_FLAG_MMX_READ_COMBINE_ROW 0x04 2798 #define PNG_ASM_FLAG_MMX_READ_INTERLACE 0x08 2799 #define PNG_ASM_FLAG_MMX_READ_FILTER_SUB 0x10 2800 #define PNG_ASM_FLAG_MMX_READ_FILTER_UP 0x20 2801 #define PNG_ASM_FLAG_MMX_READ_FILTER_AVG 0x40 2802 #define PNG_ASM_FLAG_MMX_READ_FILTER_PAETH 0x80 2803 #define PNG_ASM_FLAGS_INITIALIZED 0x80000000 /* not user-settable */ 2804 2805 #define PNG_MMX_READ_FLAGS ( PNG_ASM_FLAG_MMX_READ_COMBINE_ROW \ 2806 | PNG_ASM_FLAG_MMX_READ_INTERLACE \ 2807 | PNG_ASM_FLAG_MMX_READ_FILTER_SUB \ 2808 | PNG_ASM_FLAG_MMX_READ_FILTER_UP \ 2809 | PNG_ASM_FLAG_MMX_READ_FILTER_AVG \ 2810 | PNG_ASM_FLAG_MMX_READ_FILTER_PAETH ) 2811 #define PNG_MMX_WRITE_FLAGS ( 0 ) 2812 2813 #define PNG_MMX_FLAGS ( PNG_ASM_FLAG_MMX_SUPPORT_COMPILED \ 2814 | PNG_ASM_FLAG_MMX_SUPPORT_IN_CPU \ 2815 | PNG_MMX_READ_FLAGS \ 2816 | PNG_MMX_WRITE_FLAGS ) 2817 2818 #define PNG_SELECT_READ 1 2819 #define PNG_SELECT_WRITE 2 2820 #endif /* PNG_MMX_CODE_SUPPORTED */ 2821 2822 #ifndef PNG_1_0_X 2823 /* pngget.c */ 2824 extern PNG_EXPORT(png_uint_32,png_get_mmx_flagmask) 2825 PNGARG((int flag_select, int *compilerID)); 2826 2827 /* pngget.c */ 2828 extern PNG_EXPORT(png_uint_32,png_get_asm_flagmask) 2829 PNGARG((int flag_select)); 2830 2831 /* pngget.c */ 2832 extern PNG_EXPORT(png_uint_32,png_get_asm_flags) 2833 PNGARG((png_structp png_ptr)); 2834 2835 /* pngget.c */ 2836 extern PNG_EXPORT(png_byte,png_get_mmx_bitdepth_threshold) 2837 PNGARG((png_structp png_ptr)); 2838 2839 /* pngget.c */ 2840 extern PNG_EXPORT(png_uint_32,png_get_mmx_rowbytes_threshold) 2841 PNGARG((png_structp png_ptr)); 2842 2843 /* pngset.c */ 2844 extern PNG_EXPORT(void,png_set_asm_flags) 2845 PNGARG((png_structp png_ptr, png_uint_32 asm_flags)); 2846 2847 /* pngset.c */ 2848 extern PNG_EXPORT(void,png_set_mmx_thresholds) 2849 PNGARG((png_structp png_ptr, png_byte mmx_bitdepth_threshold, 2850 png_uint_32 mmx_rowbytes_threshold)); 2851 2852 #endif /* PNG_1_0_X */ 2853 2854 #ifndef PNG_1_0_X 2855 /* png.c, pnggccrd.c, or pngvcrd.c */ 2856 extern PNG_EXPORT(int,png_mmx_support) PNGARG((void)); 2857 #endif /* PNG_1_0_X */ 2858 #endif /* PNG_ASSEMBLER_CODE_SUPPORTED */ 2859 2860 /* Strip the prepended error numbers ("#nnn ") from error and warning 2861 * messages before passing them to the error or warning handler. 2862 */ 2863 #ifdef PNG_ERROR_NUMBERS_SUPPORTED 2864 extern PNG_EXPORT(void,png_set_strip_error_numbers) PNGARG((png_structp 2865 png_ptr, png_uint_32 strip_mode)); 2866 #endif 2867 2868 /* Added at libpng-1.2.6 */ 2869 #ifdef PNG_SET_USER_LIMITS_SUPPORTED 2870 extern PNG_EXPORT(void,png_set_user_limits) PNGARG((png_structp 2871 png_ptr, png_uint_32 user_width_max, png_uint_32 user_height_max)); 2872 extern PNG_EXPORT(png_uint_32,png_get_user_width_max) PNGARG((png_structp 2873 png_ptr)); 2874 extern PNG_EXPORT(png_uint_32,png_get_user_height_max) PNGARG((png_structp 2875 png_ptr)); 2876 #endif 2877 /* Maintainer: Put new public prototypes here ^, in libpng.3, and in 2878 * project defs 2879 */ 2880 2881 #ifdef PNG_READ_COMPOSITE_NODIV_SUPPORTED 2882 /* With these routines we avoid an integer divide, which will be slower on 2883 * most machines. However, it does take more operations than the corresponding 2884 * divide method, so it may be slower on a few RISC systems. There are two 2885 * shifts (by 8 or 16 bits) and an addition, versus a single integer divide. 2886 * 2887 * Note that the rounding factors are NOT supposed to be the same! 128 and 2888 * 32768 are correct for the NODIV code; 127 and 32767 are correct for the 2889 * standard method. 2890 * 2891 * [Optimized code by Greg Roelofs and Mark Adler...blame us for bugs. :-) ] 2892 */ 2893 2894 /* fg and bg should be in `gamma 1.0' space; alpha is the opacity */ 2895 2896 # define png_composite(composite, fg, alpha, bg) \ 2897 { png_uint_16 temp = (png_uint_16)((png_uint_16)(fg) * (png_uint_16)(alpha) \ 2898 + (png_uint_16)(bg)*(png_uint_16)(255 - \ 2899 (png_uint_16)(alpha)) + (png_uint_16)128); \ 2900 (composite) = (png_byte)((temp + (temp >> 8)) >> 8); } 2901 2902 # define png_composite_16(composite, fg, alpha, bg) \ 2903 { png_uint_32 temp = (png_uint_32)((png_uint_32)(fg) * (png_uint_32)(alpha) \ 2904 + (png_uint_32)(bg)*(png_uint_32)(65535L - \ 2905 (png_uint_32)(alpha)) + (png_uint_32)32768L); \ 2906 (composite) = (png_uint_16)((temp + (temp >> 16)) >> 16); } 2907 2908 #else /* Standard method using integer division */ 2909 2910 # define png_composite(composite, fg, alpha, bg) \ 2911 (composite) = (png_byte)(((png_uint_16)(fg) * (png_uint_16)(alpha) + \ 2912 (png_uint_16)(bg) * (png_uint_16)(255 - (png_uint_16)(alpha)) + \ 2913 (png_uint_16)127) / 255) 2914 2915 # define png_composite_16(composite, fg, alpha, bg) \ 2916 (composite) = (png_uint_16)(((png_uint_32)(fg) * (png_uint_32)(alpha) + \ 2917 (png_uint_32)(bg)*(png_uint_32)(65535L - (png_uint_32)(alpha)) + \ 2918 (png_uint_32)32767) / (png_uint_32)65535L) 2919 2920 #endif /* PNG_READ_COMPOSITE_NODIV_SUPPORTED */ 2921 2922 /* Inline macros to do direct reads of bytes from the input buffer. These 2923 * require that you are using an architecture that uses PNG byte ordering 2924 * (MSB first) and supports unaligned data storage. I think that PowerPC 2925 * in big-endian mode and 680x0 are the only ones that will support this. 2926 * The x86 line of processors definitely do not. The png_get_int_32() 2927 * routine also assumes we are using two's complement format for negative 2928 * values, which is almost certainly true. 2929 */ 2930 #ifdef PNG_READ_BIG_ENDIAN_SUPPORTED 2931 # define png_get_uint_32(buf) ( *((png_uint_32p) (buf))) 2932 # define png_get_uint_16(buf) ( *((png_uint_16p) (buf))) 2933 # define png_get_int_32(buf) ( *((png_int_32p) (buf))) 2934 #else 2935 extern PNG_EXPORT(png_uint_32,png_get_uint_32) PNGARG((png_bytep buf)); 2936 extern PNG_EXPORT(png_uint_16,png_get_uint_16) PNGARG((png_bytep buf)); 2937 extern PNG_EXPORT(png_int_32,png_get_int_32) PNGARG((png_bytep buf)); 2938 #endif /* !PNG_READ_BIG_ENDIAN_SUPPORTED */ 2939 extern PNG_EXPORT(png_uint_32,png_get_uint_31) 2940 PNGARG((png_structp png_ptr, png_bytep buf)); 2941 /* No png_get_int_16 -- may be added if there's a real need for it. */ 2942 2943 /* Place a 32-bit number into a buffer in PNG byte order (big-endian). 2944 */ 2945 extern PNG_EXPORT(void,png_save_uint_32) 2946 PNGARG((png_bytep buf, png_uint_32 i)); 2947 extern PNG_EXPORT(void,png_save_int_32) 2948 PNGARG((png_bytep buf, png_int_32 i)); 2949 2950 /* Place a 16-bit number into a buffer in PNG byte order. 2951 * The parameter is declared unsigned int, not png_uint_16, 2952 * just to avoid potential problems on pre-ANSI C compilers. 2953 */ 2954 extern PNG_EXPORT(void,png_save_uint_16) 2955 PNGARG((png_bytep buf, unsigned int i)); 2956 /* No png_save_int_16 -- may be added if there's a real need for it. */ 2957 2958 /* ************************************************************************* */ 2959 2960 /* These next functions are used internally in the code. They generally 2961 * shouldn't be used unless you are writing code to add or replace some 2962 * functionality in libpng. More information about most functions can 2963 * be found in the files where the functions are located. 2964 */ 2965 2966 2967 /* Various modes of operation, that are visible to applications because 2968 * they are used for unknown chunk location. 2969 */ 2970 #define PNG_HAVE_IHDR 0x01 2971 #define PNG_HAVE_PLTE 0x02 2972 #define PNG_HAVE_IDAT 0x04 2973 #define PNG_AFTER_IDAT 0x08 /* Have complete zlib datastream */ 2974 #define PNG_HAVE_IEND 0x10 2975 2976 #ifdef PNG_INTERNAL 2977 2978 /* More modes of operation. Note that after an init, mode is set to 2979 * zero automatically when the structure is created. 2980 */ 2981 #define PNG_HAVE_gAMA 0x20 2982 #define PNG_HAVE_cHRM 0x40 2983 #define PNG_HAVE_sRGB 0x80 2984 #define PNG_HAVE_CHUNK_HEADER 0x100 2985 #define PNG_WROTE_tIME 0x200 2986 #define PNG_WROTE_INFO_BEFORE_PLTE 0x400 2987 #define PNG_BACKGROUND_IS_GRAY 0x800 2988 #define PNG_HAVE_PNG_SIGNATURE 0x1000 2989 #define PNG_HAVE_CHUNK_AFTER_IDAT 0x2000 /* Have another chunk after IDAT */ 2990 2991 /* Flags for the transformations the PNG library does on the image data */ 2992 #define PNG_BGR 0x0001 2993 #define PNG_INTERLACE 0x0002 2994 #define PNG_PACK 0x0004 2995 #define PNG_SHIFT 0x0008 2996 #define PNG_SWAP_BYTES 0x0010 2997 #define PNG_INVERT_MONO 0x0020 2998 #define PNG_DITHER 0x0040 2999 #define PNG_BACKGROUND 0x0080 3000 #define PNG_BACKGROUND_EXPAND 0x0100 3001 /* 0x0200 unused */ 3002 #define PNG_16_TO_8 0x0400 3003 #define PNG_RGBA 0x0800 3004 #define PNG_EXPAND 0x1000 3005 #define PNG_GAMMA 0x2000 3006 #define PNG_GRAY_TO_RGB 0x4000 3007 #define PNG_FILLER 0x8000L 3008 #define PNG_PACKSWAP 0x10000L 3009 #define PNG_SWAP_ALPHA 0x20000L 3010 #define PNG_STRIP_ALPHA 0x40000L 3011 #define PNG_INVERT_ALPHA 0x80000L 3012 #define PNG_USER_TRANSFORM 0x100000L 3013 #define PNG_RGB_TO_GRAY_ERR 0x200000L 3014 #define PNG_RGB_TO_GRAY_WARN 0x400000L 3015 #define PNG_RGB_TO_GRAY 0x600000L /* two bits, RGB_TO_GRAY_ERR|WARN */ 3016 /* 0x800000L Unused */ 3017 #define PNG_ADD_ALPHA 0x1000000L /* Added to libpng-1.2.7 */ 3018 #define PNG_EXPAND_tRNS 0x2000000L /* Added to libpng-1.2.9 */ 3019 #define PNG_PREMULTIPLY_ALPHA 0x4000000L /* Added to libpng-1.2.41 */ 3020 /* by volker */ 3021 /* 0x8000000L unused */ 3022 /* 0x10000000L unused */ 3023 /* 0x20000000L unused */ 3024 /* 0x40000000L unused */ 3025 3026 /* Flags for png_create_struct */ 3027 #define PNG_STRUCT_PNG 0x0001 3028 #define PNG_STRUCT_INFO 0x0002 3029 3030 /* Scaling factor for filter heuristic weighting calculations */ 3031 #define PNG_WEIGHT_SHIFT 8 3032 #define PNG_WEIGHT_FACTOR (1<<(PNG_WEIGHT_SHIFT)) 3033 #define PNG_COST_SHIFT 3 3034 #define PNG_COST_FACTOR (1<<(PNG_COST_SHIFT)) 3035 3036 /* Flags for the png_ptr->flags rather than declaring a byte for each one */ 3037 #define PNG_FLAG_ZLIB_CUSTOM_STRATEGY 0x0001 3038 #define PNG_FLAG_ZLIB_CUSTOM_LEVEL 0x0002 3039 #define PNG_FLAG_ZLIB_CUSTOM_MEM_LEVEL 0x0004 3040 #define PNG_FLAG_ZLIB_CUSTOM_WINDOW_BITS 0x0008 3041 #define PNG_FLAG_ZLIB_CUSTOM_METHOD 0x0010 3042 #define PNG_FLAG_ZLIB_FINISHED 0x0020 3043 #define PNG_FLAG_ROW_INIT 0x0040 3044 #define PNG_FLAG_FILLER_AFTER 0x0080 3045 #define PNG_FLAG_CRC_ANCILLARY_USE 0x0100 3046 #define PNG_FLAG_CRC_ANCILLARY_NOWARN 0x0200 3047 #define PNG_FLAG_CRC_CRITICAL_USE 0x0400 3048 #define PNG_FLAG_CRC_CRITICAL_IGNORE 0x0800 3049 #define PNG_FLAG_FREE_PLTE 0x1000 3050 #define PNG_FLAG_FREE_TRNS 0x2000 3051 #define PNG_FLAG_FREE_HIST 0x4000 3052 #define PNG_FLAG_KEEP_UNKNOWN_CHUNKS 0x8000L 3053 #define PNG_FLAG_KEEP_UNSAFE_CHUNKS 0x10000L 3054 #define PNG_FLAG_LIBRARY_MISMATCH 0x20000L 3055 #define PNG_FLAG_STRIP_ERROR_NUMBERS 0x40000L 3056 #define PNG_FLAG_STRIP_ERROR_TEXT 0x80000L 3057 #define PNG_FLAG_MALLOC_NULL_MEM_OK 0x100000L 3058 #define PNG_FLAG_ADD_ALPHA 0x200000L /* Added to libpng-1.2.8 */ 3059 #define PNG_FLAG_STRIP_ALPHA 0x400000L /* Added to libpng-1.2.8 */ 3060 /* 0x800000L unused */ 3061 /* 0x1000000L unused */ 3062 /* 0x2000000L unused */ 3063 /* 0x4000000L unused */ 3064 /* 0x8000000L unused */ 3065 /* 0x10000000L unused */ 3066 /* 0x20000000L unused */ 3067 /* 0x40000000L unused */ 3068 3069 #define PNG_FLAG_CRC_ANCILLARY_MASK (PNG_FLAG_CRC_ANCILLARY_USE | \ 3070 PNG_FLAG_CRC_ANCILLARY_NOWARN) 3071 3072 #define PNG_FLAG_CRC_CRITICAL_MASK (PNG_FLAG_CRC_CRITICAL_USE | \ 3073 PNG_FLAG_CRC_CRITICAL_IGNORE) 3074 3075 #define PNG_FLAG_CRC_MASK (PNG_FLAG_CRC_ANCILLARY_MASK | \ 3076 PNG_FLAG_CRC_CRITICAL_MASK) 3077 3078 /* Save typing and make code easier to understand */ 3079 3080 #define PNG_COLOR_DIST(c1, c2) (abs((int)((c1).red) - (int)((c2).red)) + \ 3081 abs((int)((c1).green) - (int)((c2).green)) + \ 3082 abs((int)((c1).blue) - (int)((c2).blue))) 3083 3084 /* Added to libpng-1.2.6 JB */ 3085 #define PNG_ROWBYTES(pixel_bits, width) \ 3086 ((pixel_bits) >= 8 ? \ 3087 ((width) * (((png_uint_32)(pixel_bits)) >> 3)) : \ 3088 (( ((width) * ((png_uint_32)(pixel_bits))) + 7) >> 3) ) 3089 3090 /* PNG_OUT_OF_RANGE returns true if value is outside the range 3091 * ideal-delta..ideal+delta. Each argument is evaluated twice. 3092 * "ideal" and "delta" should be constants, normally simple 3093 * integers, "value" a variable. Added to libpng-1.2.6 JB 3094 */ 3095 #define PNG_OUT_OF_RANGE(value, ideal, delta) \ 3096 ( (value) < (ideal)-(delta) || (value) > (ideal)+(delta) ) 3097 3098 /* Variables declared in png.c - only it needs to define PNG_NO_EXTERN */ 3099 #if !defined(PNG_NO_EXTERN) || defined(PNG_ALWAYS_EXTERN) 3100 /* Place to hold the signature string for a PNG file. */ 3101 #ifdef PNG_USE_GLOBAL_ARRAYS 3102 PNG_EXPORT_VAR (PNG_CONST png_byte FARDATA) png_sig[8]; 3103 #else 3104 #endif 3105 #endif /* PNG_NO_EXTERN */ 3106 3107 /* Constant strings for known chunk types. If you need to add a chunk, 3108 * define the name here, and add an invocation of the macro in png.c and 3109 * wherever it's needed. 3110 */ 3111 #define PNG_IHDR png_byte png_IHDR[5] = { 73, 72, 68, 82, '\0'} 3112 #define PNG_IDAT png_byte png_IDAT[5] = { 73, 68, 65, 84, '\0'} 3113 #define PNG_IEND png_byte png_IEND[5] = { 73, 69, 78, 68, '\0'} 3114 #define PNG_PLTE png_byte png_PLTE[5] = { 80, 76, 84, 69, '\0'} 3115 #define PNG_bKGD png_byte png_bKGD[5] = { 98, 75, 71, 68, '\0'} 3116 #define PNG_cHRM png_byte png_cHRM[5] = { 99, 72, 82, 77, '\0'} 3117 #define PNG_gAMA png_byte png_gAMA[5] = {103, 65, 77, 65, '\0'} 3118 #define PNG_hIST png_byte png_hIST[5] = {104, 73, 83, 84, '\0'} 3119 #define PNG_iCCP png_byte png_iCCP[5] = {105, 67, 67, 80, '\0'} 3120 #define PNG_iTXt png_byte png_iTXt[5] = {105, 84, 88, 116, '\0'} 3121 #define PNG_oFFs png_byte png_oFFs[5] = {111, 70, 70, 115, '\0'} 3122 #define PNG_pCAL png_byte png_pCAL[5] = {112, 67, 65, 76, '\0'} 3123 #define PNG_sCAL png_byte png_sCAL[5] = {115, 67, 65, 76, '\0'} 3124 #define PNG_pHYs png_byte png_pHYs[5] = {112, 72, 89, 115, '\0'} 3125 #define PNG_sBIT png_byte png_sBIT[5] = {115, 66, 73, 84, '\0'} 3126 #define PNG_sPLT png_byte png_sPLT[5] = {115, 80, 76, 84, '\0'} 3127 #define PNG_sRGB png_byte png_sRGB[5] = {115, 82, 71, 66, '\0'} 3128 #define PNG_tEXt png_byte png_tEXt[5] = {116, 69, 88, 116, '\0'} 3129 #define PNG_tIME png_byte png_tIME[5] = {116, 73, 77, 69, '\0'} 3130 #define PNG_tRNS png_byte png_tRNS[5] = {116, 82, 78, 83, '\0'} 3131 #define PNG_zTXt png_byte png_zTXt[5] = {122, 84, 88, 116, '\0'} 3132 3133 #ifdef PNG_USE_GLOBAL_ARRAYS 3134 PNG_EXPORT_VAR (png_byte FARDATA) png_IHDR[5]; 3135 PNG_EXPORT_VAR (png_byte FARDATA) png_IDAT[5]; 3136 PNG_EXPORT_VAR (png_byte FARDATA) png_IEND[5]; 3137 PNG_EXPORT_VAR (png_byte FARDATA) png_PLTE[5]; 3138 PNG_EXPORT_VAR (png_byte FARDATA) png_bKGD[5]; 3139 PNG_EXPORT_VAR (png_byte FARDATA) png_cHRM[5]; 3140 PNG_EXPORT_VAR (png_byte FARDATA) png_gAMA[5]; 3141 PNG_EXPORT_VAR (png_byte FARDATA) png_hIST[5]; 3142 PNG_EXPORT_VAR (png_byte FARDATA) png_iCCP[5]; 3143 PNG_EXPORT_VAR (png_byte FARDATA) png_iTXt[5]; 3144 PNG_EXPORT_VAR (png_byte FARDATA) png_oFFs[5]; 3145 PNG_EXPORT_VAR (png_byte FARDATA) png_pCAL[5]; 3146 PNG_EXPORT_VAR (png_byte FARDATA) png_sCAL[5]; 3147 PNG_EXPORT_VAR (png_byte FARDATA) png_pHYs[5]; 3148 PNG_EXPORT_VAR (png_byte FARDATA) png_sBIT[5]; 3149 PNG_EXPORT_VAR (png_byte FARDATA) png_sPLT[5]; 3150 PNG_EXPORT_VAR (png_byte FARDATA) png_sRGB[5]; 3151 PNG_EXPORT_VAR (png_byte FARDATA) png_tEXt[5]; 3152 PNG_EXPORT_VAR (png_byte FARDATA) png_tIME[5]; 3153 PNG_EXPORT_VAR (png_byte FARDATA) png_tRNS[5]; 3154 PNG_EXPORT_VAR (png_byte FARDATA) png_zTXt[5]; 3155 #endif /* PNG_USE_GLOBAL_ARRAYS */ 3156 3157 #if defined(PNG_1_0_X) || defined (PNG_1_2_X) 3158 /* Initialize png_ptr struct for reading, and allocate any other memory. 3159 * (old interface - DEPRECATED - use png_create_read_struct instead). 3160 */ 3161 extern PNG_EXPORT(void,png_read_init) PNGARG((png_structp png_ptr)) 3162 PNG_DEPRECATED; 3163 #undef png_read_init 3164 #define png_read_init(png_ptr) png_read_init_3(&png_ptr, \ 3165 PNG_LIBPNG_VER_STRING, png_sizeof(png_struct)); 3166 #endif 3167 3168 extern PNG_EXPORT(void,png_read_init_3) PNGARG((png_structpp ptr_ptr, 3169 png_const_charp user_png_ver, png_size_t png_struct_size)); 3170 #if defined(PNG_1_0_X) || defined (PNG_1_2_X) 3171 extern PNG_EXPORT(void,png_read_init_2) PNGARG((png_structp png_ptr, 3172 png_const_charp user_png_ver, png_size_t png_struct_size, png_size_t 3173 png_info_size)); 3174 #endif 3175 3176 #if defined(PNG_1_0_X) || defined (PNG_1_2_X) 3177 /* Initialize png_ptr struct for writing, and allocate any other memory. 3178 * (old interface - DEPRECATED - use png_create_write_struct instead). 3179 */ 3180 extern PNG_EXPORT(void,png_write_init) PNGARG((png_structp png_ptr)) 3181 PNG_DEPRECATED; 3182 #undef png_write_init 3183 #define png_write_init(png_ptr) png_write_init_3(&png_ptr, \ 3184 PNG_LIBPNG_VER_STRING, png_sizeof(png_struct)); 3185 #endif 3186 3187 extern PNG_EXPORT(void,png_write_init_3) PNGARG((png_structpp ptr_ptr, 3188 png_const_charp user_png_ver, png_size_t png_struct_size)); 3189 extern PNG_EXPORT(void,png_write_init_2) PNGARG((png_structp png_ptr, 3190 png_const_charp user_png_ver, png_size_t png_struct_size, png_size_t 3191 png_info_size)); 3192 3193 /* Allocate memory for an internal libpng struct */ 3194 PNG_EXTERN png_voidp png_create_struct PNGARG((int type)) PNG_PRIVATE; 3195 3196 /* Free memory from internal libpng struct */ 3197 PNG_EXTERN void png_destroy_struct PNGARG((png_voidp struct_ptr)) PNG_PRIVATE; 3198 3199 PNG_EXTERN png_voidp png_create_struct_2 PNGARG((int type, png_malloc_ptr 3200 malloc_fn, png_voidp mem_ptr)) PNG_PRIVATE; 3201 PNG_EXTERN void png_destroy_struct_2 PNGARG((png_voidp struct_ptr, 3202 png_free_ptr free_fn, png_voidp mem_ptr)) PNG_PRIVATE; 3203 3204 /* Free any memory that info_ptr points to and reset struct. */ 3205 PNG_EXTERN void png_info_destroy PNGARG((png_structp png_ptr, 3206 png_infop info_ptr)) PNG_PRIVATE; 3207 3208 #ifndef PNG_1_0_X 3209 /* Function to allocate memory for zlib. */ 3210 PNG_EXTERN voidpf png_zalloc PNGARG((voidpf png_ptr, uInt items, 3211 uInt size)) PNG_PRIVATE; 3212 3213 /* Function to free memory for zlib */ 3214 PNG_EXTERN void png_zfree PNGARG((voidpf png_ptr, voidpf ptr)) PNG_PRIVATE; 3215 3216 #ifdef PNG_SIZE_T 3217 /* Function to convert a sizeof an item to png_sizeof item */ 3218 PNG_EXTERN png_size_t PNGAPI png_convert_size PNGARG((size_t size)) 3219 PNG_PRIVATE; 3220 #endif 3221 3222 /* Next four functions are used internally as callbacks. PNGAPI is required 3223 * but not PNG_EXPORT. PNGAPI added at libpng version 1.2.3. 3224 */ 3225 3226 PNG_EXTERN void PNGAPI png_default_read_data PNGARG((png_structp png_ptr, 3227 png_bytep data, png_size_t length)) PNG_PRIVATE; 3228 3229 #ifdef PNG_PROGRESSIVE_READ_SUPPORTED 3230 PNG_EXTERN void PNGAPI png_push_fill_buffer PNGARG((png_structp png_ptr, 3231 png_bytep buffer, png_size_t length)) PNG_PRIVATE; 3232 #endif 3233 3234 PNG_EXTERN void PNGAPI png_default_write_data PNGARG((png_structp png_ptr, 3235 png_bytep data, png_size_t length)) PNG_PRIVATE; 3236 3237 #ifdef PNG_WRITE_FLUSH_SUPPORTED 3238 #ifdef PNG_STDIO_SUPPORTED 3239 PNG_EXTERN void PNGAPI png_default_flush PNGARG((png_structp png_ptr)) 3240 PNG_PRIVATE; 3241 #endif 3242 #endif 3243 #else /* PNG_1_0_X */ 3244 #ifdef PNG_PROGRESSIVE_READ_SUPPORTED 3245 PNG_EXTERN void png_push_fill_buffer PNGARG((png_structp png_ptr, 3246 png_bytep buffer, png_size_t length)) PNG_PRIVATE; 3247 #endif 3248 #endif /* PNG_1_0_X */ 3249 3250 /* Reset the CRC variable */ 3251 PNG_EXTERN void png_reset_crc PNGARG((png_structp png_ptr)) PNG_PRIVATE; 3252 3253 /* Write the "data" buffer to whatever output you are using. */ 3254 PNG_EXTERN void png_write_data PNGARG((png_structp png_ptr, png_bytep data, 3255 png_size_t length)) PNG_PRIVATE; 3256 3257 /* Read data from whatever input you are using into the "data" buffer */ 3258 PNG_EXTERN void png_read_data PNGARG((png_structp png_ptr, png_bytep data, 3259 png_size_t length)) PNG_PRIVATE; 3260 3261 #ifdef PNG_INDEX_SUPPORTED 3262 PNG_EXTERN void png_seek_data PNGARG((png_structp png_ptr, 3263 png_uint_32 length)) PNG_PRIVATE; 3264 #endif 3265 3266 /* Read bytes into buf, and update png_ptr->crc */ 3267 PNG_EXTERN void png_crc_read PNGARG((png_structp png_ptr, png_bytep buf, 3268 png_size_t length)) PNG_PRIVATE; 3269 3270 /* Decompress data in a chunk that uses compression */ 3271 #if defined(PNG_zTXt_SUPPORTED) || defined(PNG_iTXt_SUPPORTED) || \ 3272 defined(PNG_iCCP_SUPPORTED) || defined(PNG_sPLT_SUPPORTED) 3273 PNG_EXTERN void png_decompress_chunk PNGARG((png_structp png_ptr, 3274 int comp_type, png_size_t chunklength, 3275 png_size_t prefix_length, png_size_t *data_length)) PNG_PRIVATE; 3276 #endif 3277 3278 /* Read "skip" bytes, read the file crc, and (optionally) verify png_ptr->crc */ 3279 PNG_EXTERN int png_crc_finish PNGARG((png_structp png_ptr, png_uint_32 skip) 3280 PNG_PRIVATE); 3281 3282 #ifdef PNG_INDEX_SUPPORTED 3283 /* Read "skip" bytes, read the file crc, and (optionally) verify png_ptr->crc */ 3284 PNG_EXTERN int png_opt_crc_finish PNGARG((png_structp png_ptr, 3285 png_uint_32 skip, int check_crc) 3286 PNG_PRIVATE); 3287 #endif 3288 3289 /* Read the CRC from the file and compare it to the libpng calculated CRC */ 3290 PNG_EXTERN int png_crc_error PNGARG((png_structp png_ptr)) PNG_PRIVATE; 3291 3292 /* Calculate the CRC over a section of data. Note that we are only 3293 * passing a maximum of 64K on systems that have this as a memory limit, 3294 * since this is the maximum buffer size we can specify. 3295 */ 3296 PNG_EXTERN void png_calculate_crc PNGARG((png_structp png_ptr, png_bytep ptr, 3297 png_size_t length)) PNG_PRIVATE; 3298 3299 #ifdef PNG_WRITE_FLUSH_SUPPORTED 3300 PNG_EXTERN void png_flush PNGARG((png_structp png_ptr)) PNG_PRIVATE; 3301 #endif 3302 3303 /* Simple function to write the signature */ 3304 PNG_EXTERN void png_write_sig PNGARG((png_structp png_ptr)) PNG_PRIVATE; 3305 3306 /* Write various chunks */ 3307 3308 /* Write the IHDR chunk, and update the png_struct with the necessary 3309 * information. 3310 */ 3311 PNG_EXTERN void png_write_IHDR PNGARG((png_structp png_ptr, png_uint_32 width, 3312 png_uint_32 height, 3313 int bit_depth, int color_type, int compression_method, int filter_method, 3314 int interlace_method)) PNG_PRIVATE; 3315 3316 PNG_EXTERN void png_write_PLTE PNGARG((png_structp png_ptr, png_colorp palette, 3317 png_uint_32 num_pal)) PNG_PRIVATE; 3318 3319 PNG_EXTERN void png_write_IDAT PNGARG((png_structp png_ptr, png_bytep data, 3320 png_size_t length)) PNG_PRIVATE; 3321 3322 PNG_EXTERN void png_write_IEND PNGARG((png_structp png_ptr)) PNG_PRIVATE; 3323 3324 #ifdef PNG_WRITE_gAMA_SUPPORTED 3325 #ifdef PNG_FLOATING_POINT_SUPPORTED 3326 PNG_EXTERN void png_write_gAMA PNGARG((png_structp png_ptr, double file_gamma)) 3327 PNG_PRIVATE; 3328 #endif 3329 #ifdef PNG_FIXED_POINT_SUPPORTED 3330 PNG_EXTERN void png_write_gAMA_fixed PNGARG((png_structp png_ptr, 3331 png_fixed_point file_gamma)) PNG_PRIVATE; 3332 #endif 3333 #endif 3334 3335 #ifdef PNG_WRITE_sBIT_SUPPORTED 3336 PNG_EXTERN void png_write_sBIT PNGARG((png_structp png_ptr, png_color_8p sbit, 3337 int color_type)) PNG_PRIVATE; 3338 #endif 3339 3340 #ifdef PNG_WRITE_cHRM_SUPPORTED 3341 #ifdef PNG_FLOATING_POINT_SUPPORTED 3342 PNG_EXTERN void png_write_cHRM PNGARG((png_structp png_ptr, 3343 double white_x, double white_y, 3344 double red_x, double red_y, double green_x, double green_y, 3345 double blue_x, double blue_y)) PNG_PRIVATE; 3346 #endif 3347 #ifdef PNG_FIXED_POINT_SUPPORTED 3348 PNG_EXTERN void png_write_cHRM_fixed PNGARG((png_structp png_ptr, 3349 png_fixed_point int_white_x, png_fixed_point int_white_y, 3350 png_fixed_point int_red_x, png_fixed_point int_red_y, png_fixed_point 3351 int_green_x, png_fixed_point int_green_y, png_fixed_point int_blue_x, 3352 png_fixed_point int_blue_y)) PNG_PRIVATE; 3353 #endif 3354 #endif 3355 3356 #ifdef PNG_WRITE_sRGB_SUPPORTED 3357 PNG_EXTERN void png_write_sRGB PNGARG((png_structp png_ptr, 3358 int intent)) PNG_PRIVATE; 3359 #endif 3360 3361 #ifdef PNG_WRITE_iCCP_SUPPORTED 3362 PNG_EXTERN void png_write_iCCP PNGARG((png_structp png_ptr, 3363 png_charp name, int compression_type, 3364 png_charp profile, int proflen)) PNG_PRIVATE; 3365 /* Note to maintainer: profile should be png_bytep */ 3366 #endif 3367 3368 #ifdef PNG_WRITE_sPLT_SUPPORTED 3369 PNG_EXTERN void png_write_sPLT PNGARG((png_structp png_ptr, 3370 png_sPLT_tp palette)) PNG_PRIVATE; 3371 #endif 3372 3373 #ifdef PNG_WRITE_tRNS_SUPPORTED 3374 PNG_EXTERN void png_write_tRNS PNGARG((png_structp png_ptr, png_bytep trans, 3375 png_color_16p values, int number, int color_type)) PNG_PRIVATE; 3376 #endif 3377 3378 #ifdef PNG_WRITE_bKGD_SUPPORTED 3379 PNG_EXTERN void png_write_bKGD PNGARG((png_structp png_ptr, 3380 png_color_16p values, int color_type)) PNG_PRIVATE; 3381 #endif 3382 3383 #ifdef PNG_WRITE_hIST_SUPPORTED 3384 PNG_EXTERN void png_write_hIST PNGARG((png_structp png_ptr, png_uint_16p hist, 3385 int num_hist)) PNG_PRIVATE; 3386 #endif 3387 3388 #if defined(PNG_WRITE_TEXT_SUPPORTED) || defined(PNG_WRITE_pCAL_SUPPORTED) || \ 3389 defined(PNG_WRITE_iCCP_SUPPORTED) || defined(PNG_WRITE_sPLT_SUPPORTED) 3390 PNG_EXTERN png_size_t png_check_keyword PNGARG((png_structp png_ptr, 3391 png_charp key, png_charpp new_key)) PNG_PRIVATE; 3392 #endif 3393 3394 #ifdef PNG_WRITE_tEXt_SUPPORTED 3395 PNG_EXTERN void png_write_tEXt PNGARG((png_structp png_ptr, png_charp key, 3396 png_charp text, png_size_t text_len)) PNG_PRIVATE; 3397 #endif 3398 3399 #ifdef PNG_WRITE_zTXt_SUPPORTED 3400 PNG_EXTERN void png_write_zTXt PNGARG((png_structp png_ptr, png_charp key, 3401 png_charp text, png_size_t text_len, int compression)) PNG_PRIVATE; 3402 #endif 3403 3404 #ifdef PNG_WRITE_iTXt_SUPPORTED 3405 PNG_EXTERN void png_write_iTXt PNGARG((png_structp png_ptr, 3406 int compression, png_charp key, png_charp lang, png_charp lang_key, 3407 png_charp text)) PNG_PRIVATE; 3408 #endif 3409 3410 #ifdef PNG_TEXT_SUPPORTED /* Added at version 1.0.14 and 1.2.4 */ 3411 PNG_EXTERN int png_set_text_2 PNGARG((png_structp png_ptr, 3412 png_infop info_ptr, png_textp text_ptr, int num_text)) PNG_PRIVATE; 3413 #endif 3414 3415 #ifdef PNG_WRITE_oFFs_SUPPORTED 3416 PNG_EXTERN void png_write_oFFs PNGARG((png_structp png_ptr, 3417 png_int_32 x_offset, png_int_32 y_offset, int unit_type)) PNG_PRIVATE; 3418 #endif 3419 3420 #ifdef PNG_WRITE_pCAL_SUPPORTED 3421 PNG_EXTERN void png_write_pCAL PNGARG((png_structp png_ptr, png_charp purpose, 3422 png_int_32 X0, png_int_32 X1, int type, int nparams, 3423 png_charp units, png_charpp params)) PNG_PRIVATE; 3424 #endif 3425 3426 #ifdef PNG_WRITE_pHYs_SUPPORTED 3427 PNG_EXTERN void png_write_pHYs PNGARG((png_structp png_ptr, 3428 png_uint_32 x_pixels_per_unit, png_uint_32 y_pixels_per_unit, 3429 int unit_type)) PNG_PRIVATE; 3430 #endif 3431 3432 #ifdef PNG_WRITE_tIME_SUPPORTED 3433 PNG_EXTERN void png_write_tIME PNGARG((png_structp png_ptr, 3434 png_timep mod_time)) PNG_PRIVATE; 3435 #endif 3436 3437 #ifdef PNG_WRITE_sCAL_SUPPORTED 3438 #if defined(PNG_FLOATING_POINT_SUPPORTED) && !defined(PNG_NO_STDIO) 3439 PNG_EXTERN void png_write_sCAL PNGARG((png_structp png_ptr, 3440 int unit, double width, double height)) PNG_PRIVATE; 3441 #else 3442 #ifdef PNG_FIXED_POINT_SUPPORTED 3443 PNG_EXTERN void png_write_sCAL_s PNGARG((png_structp png_ptr, 3444 int unit, png_charp width, png_charp height)) PNG_PRIVATE; 3445 #endif 3446 #endif 3447 #endif 3448 3449 /* Called when finished processing a row of data */ 3450 PNG_EXTERN void png_write_finish_row PNGARG((png_structp png_ptr)) PNG_PRIVATE; 3451 3452 /* Internal use only. Called before first row of data */ 3453 PNG_EXTERN void png_write_start_row PNGARG((png_structp png_ptr)) PNG_PRIVATE; 3454 3455 #ifdef PNG_READ_GAMMA_SUPPORTED 3456 PNG_EXTERN void png_build_gamma_table PNGARG((png_structp png_ptr)) PNG_PRIVATE; 3457 #endif 3458 3459 /* Combine a row of data, dealing with alpha, etc. if requested */ 3460 PNG_EXTERN void png_combine_row PNGARG((png_structp png_ptr, png_bytep row, 3461 int mask)) PNG_PRIVATE; 3462 3463 #ifdef PNG_READ_INTERLACING_SUPPORTED 3464 /* Expand an interlaced row */ 3465 /* OLD pre-1.0.9 interface: 3466 PNG_EXTERN void png_do_read_interlace PNGARG((png_row_infop row_info, 3467 png_bytep row, int pass, png_uint_32 transformations)) PNG_PRIVATE; 3468 */ 3469 PNG_EXTERN void png_do_read_interlace PNGARG((png_structp png_ptr)) PNG_PRIVATE; 3470 #endif 3471 3472 /* GRR TO DO (2.0 or whenever): simplify other internal calling interfaces */ 3473 3474 #ifdef PNG_WRITE_INTERLACING_SUPPORTED 3475 /* Grab pixels out of a row for an interlaced pass */ 3476 PNG_EXTERN void png_do_write_interlace PNGARG((png_row_infop row_info, 3477 png_bytep row, int pass)) PNG_PRIVATE; 3478 #endif 3479 3480 /* Unfilter a row */ 3481 PNG_EXTERN void png_read_filter_row PNGARG((png_structp png_ptr, 3482 png_row_infop row_info, png_bytep row, png_bytep prev_row, 3483 int filter)) PNG_PRIVATE; 3484 3485 /* Choose the best filter to use and filter the row data */ 3486 PNG_EXTERN void png_write_find_filter PNGARG((png_structp png_ptr, 3487 png_row_infop row_info)) PNG_PRIVATE; 3488 3489 /* Write out the filtered row. */ 3490 PNG_EXTERN void png_write_filtered_row PNGARG((png_structp png_ptr, 3491 png_bytep filtered_row)) PNG_PRIVATE; 3492 /* Finish a row while reading, dealing with interlacing passes, etc. */ 3493 PNG_EXTERN void png_read_finish_row PNGARG((png_structp png_ptr)); 3494 3495 #ifdef PNG_INDEX_SUPPORTED 3496 /* Update the decoder status to the given pass */ 3497 PNG_EXTERN void png_set_interlaced_pass PNGARG((png_structp png_ptr, int pass)); 3498 #endif 3499 3500 /* Initialize the row buffers, etc. */ 3501 PNG_EXTERN void png_read_start_row PNGARG((png_structp png_ptr)) PNG_PRIVATE; 3502 /* Optional call to update the users info structure */ 3503 PNG_EXTERN void png_read_transform_info PNGARG((png_structp png_ptr, 3504 png_infop info_ptr)) PNG_PRIVATE; 3505 3506 /* These are the functions that do the transformations */ 3507 #ifdef PNG_READ_FILLER_SUPPORTED 3508 PNG_EXTERN void png_do_read_filler PNGARG((png_row_infop row_info, 3509 png_bytep row, png_uint_32 filler, png_uint_32 flags)) PNG_PRIVATE; 3510 #endif 3511 3512 #ifdef PNG_READ_SWAP_ALPHA_SUPPORTED 3513 PNG_EXTERN void png_do_read_swap_alpha PNGARG((png_row_infop row_info, 3514 png_bytep row)) PNG_PRIVATE; 3515 #endif 3516 3517 #ifdef PNG_WRITE_SWAP_ALPHA_SUPPORTED 3518 PNG_EXTERN void png_do_write_swap_alpha PNGARG((png_row_infop row_info, 3519 png_bytep row)) PNG_PRIVATE; 3520 #endif 3521 3522 #ifdef PNG_READ_INVERT_ALPHA_SUPPORTED 3523 PNG_EXTERN void png_do_read_invert_alpha PNGARG((png_row_infop row_info, 3524 png_bytep row)) PNG_PRIVATE; 3525 #endif 3526 3527 #ifdef PNG_WRITE_INVERT_ALPHA_SUPPORTED 3528 PNG_EXTERN void png_do_write_invert_alpha PNGARG((png_row_infop row_info, 3529 png_bytep row)) PNG_PRIVATE; 3530 #endif 3531 3532 #if defined(PNG_WRITE_FILLER_SUPPORTED) || \ 3533 defined(PNG_READ_STRIP_ALPHA_SUPPORTED) 3534 PNG_EXTERN void png_do_strip_filler PNGARG((png_row_infop row_info, 3535 png_bytep row, png_uint_32 flags)) PNG_PRIVATE; 3536 #endif 3537 3538 #if defined(PNG_READ_SWAP_SUPPORTED) || defined(PNG_WRITE_SWAP_SUPPORTED) 3539 PNG_EXTERN void png_do_swap PNGARG((png_row_infop row_info, 3540 png_bytep row)) PNG_PRIVATE; 3541 #endif 3542 3543 #if defined(PNG_READ_PACKSWAP_SUPPORTED) || defined(PNG_WRITE_PACKSWAP_SUPPORTED) 3544 PNG_EXTERN void png_do_packswap PNGARG((png_row_infop row_info, 3545 png_bytep row)) PNG_PRIVATE; 3546 #endif 3547 3548 #ifdef PNG_READ_RGB_TO_GRAY_SUPPORTED 3549 PNG_EXTERN int png_do_rgb_to_gray PNGARG((png_structp png_ptr, png_row_infop 3550 row_info, png_bytep row)) PNG_PRIVATE; 3551 #endif 3552 3553 #ifdef PNG_READ_GRAY_TO_RGB_SUPPORTED 3554 PNG_EXTERN void png_do_gray_to_rgb PNGARG((png_row_infop row_info, 3555 png_bytep row)) PNG_PRIVATE; 3556 #endif 3557 3558 #ifdef PNG_READ_PACK_SUPPORTED 3559 PNG_EXTERN void png_do_unpack PNGARG((png_row_infop row_info, 3560 png_bytep row)) PNG_PRIVATE; 3561 #endif 3562 3563 #ifdef PNG_READ_SHIFT_SUPPORTED 3564 PNG_EXTERN void png_do_unshift PNGARG((png_row_infop row_info, png_bytep row, 3565 png_color_8p sig_bits)) PNG_PRIVATE; 3566 #endif 3567 3568 #if defined(PNG_READ_INVERT_SUPPORTED) || defined(PNG_WRITE_INVERT_SUPPORTED) 3569 PNG_EXTERN void png_do_invert PNGARG((png_row_infop row_info, 3570 png_bytep row)) PNG_PRIVATE; 3571 #endif 3572 3573 #ifdef PNG_READ_16_TO_8_SUPPORTED 3574 PNG_EXTERN void png_do_chop PNGARG((png_row_infop row_info, 3575 png_bytep row)) PNG_PRIVATE; 3576 #endif 3577 3578 #ifdef PNG_READ_DITHER_SUPPORTED 3579 PNG_EXTERN void png_do_dither PNGARG((png_row_infop row_info, 3580 png_bytep row, png_bytep palette_lookup, 3581 png_bytep dither_lookup)) PNG_PRIVATE; 3582 3583 # ifdef PNG_CORRECT_PALETTE_SUPPORTED 3584 PNG_EXTERN void png_correct_palette PNGARG((png_structp png_ptr, 3585 png_colorp palette, int num_palette)) PNG_PRIVATE; 3586 # endif 3587 #endif 3588 3589 #if defined(PNG_READ_BGR_SUPPORTED) || defined(PNG_WRITE_BGR_SUPPORTED) 3590 PNG_EXTERN void png_do_bgr PNGARG((png_row_infop row_info, 3591 png_bytep row)) PNG_PRIVATE; 3592 #endif 3593 3594 #ifdef PNG_WRITE_PACK_SUPPORTED 3595 PNG_EXTERN void png_do_pack PNGARG((png_row_infop row_info, 3596 png_bytep row, png_uint_32 bit_depth)) PNG_PRIVATE; 3597 #endif 3598 3599 #ifdef PNG_WRITE_SHIFT_SUPPORTED 3600 PNG_EXTERN void png_do_shift PNGARG((png_row_infop row_info, png_bytep row, 3601 png_color_8p bit_depth)) PNG_PRIVATE; 3602 #endif 3603 3604 #ifdef PNG_READ_BACKGROUND_SUPPORTED 3605 #ifdef PNG_READ_GAMMA_SUPPORTED 3606 PNG_EXTERN void png_do_background PNGARG((png_row_infop row_info, png_bytep row, 3607 png_color_16p trans_values, png_color_16p background, 3608 png_color_16p background_1, 3609 png_bytep gamma_table, png_bytep gamma_from_1, png_bytep gamma_to_1, 3610 png_uint_16pp gamma_16, png_uint_16pp gamma_16_from_1, 3611 png_uint_16pp gamma_16_to_1, int gamma_shift)) PNG_PRIVATE; 3612 #else 3613 PNG_EXTERN void png_do_background PNGARG((png_row_infop row_info, png_bytep row, 3614 png_color_16p trans_values, png_color_16p background)) PNG_PRIVATE; 3615 #endif 3616 #endif 3617 3618 #ifdef PNG_READ_GAMMA_SUPPORTED 3619 PNG_EXTERN void png_do_gamma PNGARG((png_row_infop row_info, png_bytep row, 3620 png_bytep gamma_table, png_uint_16pp gamma_16_table, 3621 int gamma_shift)) PNG_PRIVATE; 3622 #endif 3623 3624 #ifdef PNG_READ_EXPAND_SUPPORTED 3625 PNG_EXTERN void png_do_expand_palette PNGARG((png_row_infop row_info, 3626 png_bytep row, png_colorp palette, png_bytep trans, 3627 int num_trans)) PNG_PRIVATE; 3628 PNG_EXTERN void png_do_expand PNGARG((png_row_infop row_info, 3629 png_bytep row, png_color_16p trans_value)) PNG_PRIVATE; 3630 #endif 3631 3632 /* The following decodes the appropriate chunks, and does error correction, 3633 * then calls the appropriate callback for the chunk if it is valid. 3634 */ 3635 3636 /* Decode the IHDR chunk */ 3637 PNG_EXTERN void png_handle_IHDR PNGARG((png_structp png_ptr, png_infop info_ptr, 3638 png_uint_32 length)) PNG_PRIVATE; 3639 PNG_EXTERN void png_handle_PLTE PNGARG((png_structp png_ptr, png_infop info_ptr, 3640 png_uint_32 length)); 3641 PNG_EXTERN void png_handle_IEND PNGARG((png_structp png_ptr, png_infop info_ptr, 3642 png_uint_32 length)); 3643 3644 #ifdef PNG_READ_bKGD_SUPPORTED 3645 PNG_EXTERN void png_handle_bKGD PNGARG((png_structp png_ptr, png_infop info_ptr, 3646 png_uint_32 length)) PNG_PRIVATE; 3647 #endif 3648 3649 #ifdef PNG_READ_cHRM_SUPPORTED 3650 PNG_EXTERN void png_handle_cHRM PNGARG((png_structp png_ptr, png_infop info_ptr, 3651 png_uint_32 length)) PNG_PRIVATE; 3652 #endif 3653 3654 #ifdef PNG_READ_gAMA_SUPPORTED 3655 PNG_EXTERN void png_handle_gAMA PNGARG((png_structp png_ptr, png_infop info_ptr, 3656 png_uint_32 length)) PNG_PRIVATE; 3657 #endif 3658 3659 #ifdef PNG_READ_hIST_SUPPORTED 3660 PNG_EXTERN void png_handle_hIST PNGARG((png_structp png_ptr, png_infop info_ptr, 3661 png_uint_32 length)) PNG_PRIVATE; 3662 #endif 3663 3664 #ifdef PNG_READ_iCCP_SUPPORTED 3665 extern void png_handle_iCCP PNGARG((png_structp png_ptr, png_infop info_ptr, 3666 png_uint_32 length)); 3667 #endif /* PNG_READ_iCCP_SUPPORTED */ 3668 3669 #ifdef PNG_READ_iTXt_SUPPORTED 3670 PNG_EXTERN void png_handle_iTXt PNGARG((png_structp png_ptr, png_infop info_ptr, 3671 png_uint_32 length)) PNG_PRIVATE; 3672 #endif 3673 3674 #ifdef PNG_READ_oFFs_SUPPORTED 3675 PNG_EXTERN void png_handle_oFFs PNGARG((png_structp png_ptr, png_infop info_ptr, 3676 png_uint_32 length)) PNG_PRIVATE; 3677 #endif 3678 3679 #ifdef PNG_READ_pCAL_SUPPORTED 3680 PNG_EXTERN void png_handle_pCAL PNGARG((png_structp png_ptr, png_infop info_ptr, 3681 png_uint_32 length)) PNG_PRIVATE; 3682 #endif 3683 3684 #ifdef PNG_READ_pHYs_SUPPORTED 3685 PNG_EXTERN void png_handle_pHYs PNGARG((png_structp png_ptr, png_infop info_ptr, 3686 png_uint_32 length)) PNG_PRIVATE; 3687 #endif 3688 3689 #ifdef PNG_READ_sBIT_SUPPORTED 3690 PNG_EXTERN void png_handle_sBIT PNGARG((png_structp png_ptr, png_infop info_ptr, 3691 png_uint_32 length)) PNG_PRIVATE; 3692 #endif 3693 3694 #ifdef PNG_READ_sCAL_SUPPORTED 3695 PNG_EXTERN void png_handle_sCAL PNGARG((png_structp png_ptr, png_infop info_ptr, 3696 png_uint_32 length)) PNG_PRIVATE; 3697 #endif 3698 3699 #ifdef PNG_READ_sPLT_SUPPORTED 3700 extern void png_handle_sPLT PNGARG((png_structp png_ptr, png_infop info_ptr, 3701 png_uint_32 length)) PNG_PRIVATE; 3702 #endif /* PNG_READ_sPLT_SUPPORTED */ 3703 3704 #ifdef PNG_READ_sRGB_SUPPORTED 3705 PNG_EXTERN void png_handle_sRGB PNGARG((png_structp png_ptr, png_infop info_ptr, 3706 png_uint_32 length)) PNG_PRIVATE; 3707 #endif 3708 3709 #ifdef PNG_READ_tEXt_SUPPORTED 3710 PNG_EXTERN void png_handle_tEXt PNGARG((png_structp png_ptr, png_infop info_ptr, 3711 png_uint_32 length)) PNG_PRIVATE; 3712 #endif 3713 3714 #ifdef PNG_READ_tIME_SUPPORTED 3715 PNG_EXTERN void png_handle_tIME PNGARG((png_structp png_ptr, png_infop info_ptr, 3716 png_uint_32 length)) PNG_PRIVATE; 3717 #endif 3718 3719 #ifdef PNG_READ_tRNS_SUPPORTED 3720 PNG_EXTERN void png_handle_tRNS PNGARG((png_structp png_ptr, png_infop info_ptr, 3721 png_uint_32 length)) PNG_PRIVATE; 3722 #endif 3723 3724 #ifdef PNG_READ_zTXt_SUPPORTED 3725 PNG_EXTERN void png_handle_zTXt PNGARG((png_structp png_ptr, png_infop info_ptr, 3726 png_uint_32 length)) PNG_PRIVATE; 3727 #endif 3728 3729 PNG_EXTERN void png_handle_unknown PNGARG((png_structp png_ptr, 3730 png_infop info_ptr, png_uint_32 length)) PNG_PRIVATE; 3731 3732 PNG_EXTERN void png_check_chunk_name PNGARG((png_structp png_ptr, 3733 png_bytep chunk_name)) PNG_PRIVATE; 3734 3735 /* Handle the transformations for reading and writing */ 3736 PNG_EXTERN void png_do_read_transformations 3737 PNGARG((png_structp png_ptr)) PNG_PRIVATE; 3738 PNG_EXTERN void png_do_write_transformations 3739 PNGARG((png_structp png_ptr)) PNG_PRIVATE; 3740 3741 PNG_EXTERN void png_init_read_transformations 3742 PNGARG((png_structp png_ptr)) PNG_PRIVATE; 3743 3744 #ifdef PNG_PROGRESSIVE_READ_SUPPORTED 3745 PNG_EXTERN void png_push_read_chunk PNGARG((png_structp png_ptr, 3746 png_infop info_ptr)) PNG_PRIVATE; 3747 PNG_EXTERN void png_push_read_sig PNGARG((png_structp png_ptr, 3748 png_infop info_ptr)) PNG_PRIVATE; 3749 PNG_EXTERN void png_push_check_crc PNGARG((png_structp png_ptr)) PNG_PRIVATE; 3750 PNG_EXTERN void png_push_crc_skip PNGARG((png_structp png_ptr, 3751 png_uint_32 length)) PNG_PRIVATE; 3752 PNG_EXTERN void png_push_crc_finish PNGARG((png_structp png_ptr)) PNG_PRIVATE; 3753 PNG_EXTERN void png_push_save_buffer PNGARG((png_structp png_ptr)) PNG_PRIVATE; 3754 PNG_EXTERN void png_push_restore_buffer PNGARG((png_structp png_ptr, 3755 png_bytep buffer, png_size_t buffer_length)) PNG_PRIVATE; 3756 PNG_EXTERN void png_push_read_IDAT PNGARG((png_structp png_ptr)) PNG_PRIVATE; 3757 PNG_EXTERN void png_process_IDAT_data PNGARG((png_structp png_ptr, 3758 png_bytep buffer, png_size_t buffer_length)) PNG_PRIVATE; 3759 PNG_EXTERN void png_push_process_row PNGARG((png_structp png_ptr)) PNG_PRIVATE; 3760 PNG_EXTERN void png_push_handle_unknown PNGARG((png_structp png_ptr, 3761 png_infop info_ptr, png_uint_32 length)) PNG_PRIVATE; 3762 PNG_EXTERN void png_push_have_info PNGARG((png_structp png_ptr, 3763 png_infop info_ptr)) PNG_PRIVATE; 3764 PNG_EXTERN void png_push_have_end PNGARG((png_structp png_ptr, 3765 png_infop info_ptr)) PNG_PRIVATE; 3766 PNG_EXTERN void png_push_have_row PNGARG((png_structp png_ptr, 3767 png_bytep row)) PNG_PRIVATE; 3768 PNG_EXTERN void png_push_read_end PNGARG((png_structp png_ptr, 3769 png_infop info_ptr)) PNG_PRIVATE; 3770 PNG_EXTERN void png_process_some_data PNGARG((png_structp png_ptr, 3771 png_infop info_ptr)) PNG_PRIVATE; 3772 PNG_EXTERN void png_read_push_finish_row 3773 PNGARG((png_structp png_ptr)) PNG_PRIVATE; 3774 #ifdef PNG_READ_tEXt_SUPPORTED 3775 PNG_EXTERN void png_push_handle_tEXt PNGARG((png_structp png_ptr, 3776 png_infop info_ptr, png_uint_32 length)) PNG_PRIVATE; 3777 PNG_EXTERN void png_push_read_tEXt PNGARG((png_structp png_ptr, 3778 png_infop info_ptr)) PNG_PRIVATE; 3779 #endif 3780 #ifdef PNG_READ_zTXt_SUPPORTED 3781 PNG_EXTERN void png_push_handle_zTXt PNGARG((png_structp png_ptr, 3782 png_infop info_ptr, png_uint_32 length)) PNG_PRIVATE; 3783 PNG_EXTERN void png_push_read_zTXt PNGARG((png_structp png_ptr, 3784 png_infop info_ptr)) PNG_PRIVATE; 3785 #endif 3786 #ifdef PNG_READ_iTXt_SUPPORTED 3787 PNG_EXTERN void png_push_handle_iTXt PNGARG((png_structp png_ptr, 3788 png_infop info_ptr, png_uint_32 length)) PNG_PRIVATE; 3789 PNG_EXTERN void png_push_read_iTXt PNGARG((png_structp png_ptr, 3790 png_infop info_ptr)) PNG_PRIVATE; 3791 #endif 3792 3793 #endif /* PNG_PROGRESSIVE_READ_SUPPORTED */ 3794 3795 #ifdef PNG_MNG_FEATURES_SUPPORTED 3796 PNG_EXTERN void png_do_read_intrapixel PNGARG((png_row_infop row_info, 3797 png_bytep row)) PNG_PRIVATE; 3798 PNG_EXTERN void png_do_write_intrapixel PNGARG((png_row_infop row_info, 3799 png_bytep row)) PNG_PRIVATE; 3800 #endif 3801 3802 #ifdef PNG_ASSEMBLER_CODE_SUPPORTED 3803 #ifdef PNG_MMX_CODE_SUPPORTED 3804 /* png.c */ /* PRIVATE */ 3805 PNG_EXTERN void png_init_mmx_flags PNGARG((png_structp png_ptr)) PNG_PRIVATE; 3806 #endif 3807 #endif 3808 3809 3810 /* The following six functions will be exported in libpng-1.4.0. */ 3811 #if defined(PNG_INCH_CONVERSIONS) && defined(PNG_FLOATING_POINT_SUPPORTED) 3812 PNG_EXTERN png_uint_32 png_get_pixels_per_inch PNGARG((png_structp png_ptr, 3813 png_infop info_ptr)); 3814 3815 PNG_EXTERN png_uint_32 png_get_x_pixels_per_inch PNGARG((png_structp png_ptr, 3816 png_infop info_ptr)); 3817 3818 PNG_EXTERN png_uint_32 png_get_y_pixels_per_inch PNGARG((png_structp png_ptr, 3819 png_infop info_ptr)); 3820 3821 PNG_EXTERN float png_get_x_offset_inches PNGARG((png_structp png_ptr, 3822 png_infop info_ptr)); 3823 3824 PNG_EXTERN float png_get_y_offset_inches PNGARG((png_structp png_ptr, 3825 png_infop info_ptr)); 3826 3827 #ifdef PNG_pHYs_SUPPORTED 3828 PNG_EXTERN png_uint_32 png_get_pHYs_dpi PNGARG((png_structp png_ptr, 3829 png_infop info_ptr, png_uint_32 *res_x, png_uint_32 *res_y, int *unit_type)); 3830 #endif /* PNG_pHYs_SUPPORTED */ 3831 #endif /* PNG_INCH_CONVERSIONS && PNG_FLOATING_POINT_SUPPORTED */ 3832 3833 /* Read the chunk header (length + type name) */ 3834 PNG_EXTERN png_uint_32 png_read_chunk_header 3835 PNGARG((png_structp png_ptr)) PNG_PRIVATE; 3836 3837 /* Added at libpng version 1.2.34 */ 3838 #ifdef PNG_cHRM_SUPPORTED 3839 PNG_EXTERN int png_check_cHRM_fixed PNGARG((png_structp png_ptr, 3840 png_fixed_point int_white_x, png_fixed_point int_white_y, 3841 png_fixed_point int_red_x, png_fixed_point int_red_y, png_fixed_point 3842 int_green_x, png_fixed_point int_green_y, png_fixed_point int_blue_x, 3843 png_fixed_point int_blue_y)) PNG_PRIVATE; 3844 #endif 3845 3846 #ifdef PNG_cHRM_SUPPORTED 3847 #ifdef PNG_CHECK_cHRM_SUPPORTED 3848 /* Added at libpng version 1.2.34 */ 3849 PNG_EXTERN void png_64bit_product PNGARG((long v1, long v2, 3850 unsigned long *hi_product, unsigned long *lo_product)) PNG_PRIVATE; 3851 #endif 3852 #endif 3853 3854 /* Added at libpng version 1.2.41 */ 3855 PNG_EXTERN void png_check_IHDR PNGARG((png_structp png_ptr, 3856 png_uint_32 width, png_uint_32 height, int bit_depth, 3857 int color_type, int interlace_type, int compression_type, 3858 int filter_type)) PNG_PRIVATE; 3859 3860 /* Added at libpng version 1.2.41 */ 3861 PNG_EXTERN png_voidp png_calloc PNGARG((png_structp png_ptr, 3862 png_uint_32 size)); 3863 3864 /* Maintainer: Put new private prototypes here ^ and in libpngpf.3 */ 3865 3866 #endif /* PNG_INTERNAL */ 3867 3868 #ifdef __cplusplus 3869 } 3870 #endif 3871 3872 #endif /* PNG_VERSION_INFO_ONLY */ 3873 /* Do not put anything past this line */ 3874 #endif /* PNG_H */ 3875
