1/* png.h - header file for PNG reference library 2 * 3 * libpng version 1.2.46 - July 9, 2011 4 * Copyright (c) 1998-2011 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 1.2.46 - July 9, 2011: 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 * 1.0.45 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 * 1.2.45beta01-03 13 10245 12.so.0.45[.0] 266 * 1.0.55rc01 10 10055 10.so.0.55[.0] 267 * 1.2.45rc01 13 10245 12.so.0.45[.0] 268 * 1.0.55 10 10055 10.so.0.55[.0] 269 * 1.2.45 13 10245 12.so.0.45[.0] 270 * 1.2.46rc01-02 13 10246 12.so.0.46[.0] 271 * 1.0.56 10 10056 10.so.0.56[.0] 272 * 1.2.46 13 10246 12.so.0.46[.0] 273 * 274 * Henceforth the source version will match the shared-library major 275 * and minor numbers; the shared-library major version number will be 276 * used for changes in backward compatibility, as it is intended. The 277 * PNG_LIBPNG_VER macro, which is not used within libpng but is available 278 * for applications, is an unsigned integer of the form xyyzz corresponding 279 * to the source version x.y.z (leading zeros in y and z). Beta versions 280 * were given the previous public release number plus a letter, until 281 * version 1.0.6j; from then on they were given the upcoming public 282 * release number plus "betaNN" or "rcNN". 283 * 284 * Binary incompatibility exists only when applications make direct access 285 * to the info_ptr or png_ptr members through png.h, and the compiled 286 * application is loaded with a different version of the library. 287 * 288 * DLLNUM will change each time there are forward or backward changes 289 * in binary compatibility (e.g., when a new feature is added). 290 * 291 * See libpng.txt or libpng.3 for more information. The PNG specification 292 * is available as a W3C Recommendation and as an ISO Specification, 293 * <http://www.w3.org/TR/2003/REC-PNG-20031110/ 294 */ 295 296/* 297 * COPYRIGHT NOTICE, DISCLAIMER, and LICENSE: 298 * 299 * If you modify libpng you may insert additional notices immediately following 300 * this sentence. 301 * 302 * This code is released under the libpng license. 303 * 304 * libpng versions 1.2.6, August 15, 2004, through 1.2.46, July 9, 2011, are 305 * Copyright (c) 2004, 2006-2011 Glenn Randers-Pehrson, and are 306 * distributed according to the same disclaimer and license as libpng-1.2.5 307 * with the following individual added to the list of Contributing Authors: 308 * 309 * Cosmin Truta 310 * 311 * libpng versions 1.0.7, July 1, 2000, through 1.2.5, October 3, 2002, are 312 * Copyright (c) 2000-2002 Glenn Randers-Pehrson, and are 313 * distributed according to the same disclaimer and license as libpng-1.0.6 314 * with the following individuals added to the list of Contributing Authors: 315 * 316 * Simon-Pierre Cadieux 317 * Eric S. Raymond 318 * Gilles Vollant 319 * 320 * and with the following additions to the disclaimer: 321 * 322 * There is no warranty against interference with your enjoyment of the 323 * library or against infringement. There is no warranty that our 324 * efforts or the library will fulfill any of your particular purposes 325 * or needs. This library is provided with all faults, and the entire 326 * risk of satisfactory quality, performance, accuracy, and effort is with 327 * the user. 328 * 329 * libpng versions 0.97, January 1998, through 1.0.6, March 20, 2000, are 330 * Copyright (c) 1998, 1999, 2000 Glenn Randers-Pehrson, and are 331 * distributed according to the same disclaimer and license as libpng-0.96, 332 * with the following individuals added to the list of Contributing Authors: 333 * 334 * Tom Lane 335 * Glenn Randers-Pehrson 336 * Willem van Schaik 337 * 338 * libpng versions 0.89, June 1996, through 0.96, May 1997, are 339 * Copyright (c) 1996, 1997 Andreas Dilger 340 * Distributed according to the same disclaimer and license as libpng-0.88, 341 * with the following individuals added to the list of Contributing Authors: 342 * 343 * John Bowler 344 * Kevin Bracey 345 * Sam Bushell 346 * Magnus Holmgren 347 * Greg Roelofs 348 * Tom Tanner 349 * 350 * libpng versions 0.5, May 1995, through 0.88, January 1996, are 351 * Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc. 352 * 353 * For the purposes of this copyright and license, "Contributing Authors" 354 * is defined as the following set of individuals: 355 * 356 * Andreas Dilger 357 * Dave Martindale 358 * Guy Eric Schalnat 359 * Paul Schmidt 360 * Tim Wegner 361 * 362 * The PNG Reference Library is supplied "AS IS". The Contributing Authors 363 * and Group 42, Inc. disclaim all warranties, expressed or implied, 364 * including, without limitation, the warranties of merchantability and of 365 * fitness for any purpose. The Contributing Authors and Group 42, Inc. 366 * assume no liability for direct, indirect, incidental, special, exemplary, 367 * or consequential damages, which may result from the use of the PNG 368 * Reference Library, even if advised of the possibility of such damage. 369 * 370 * Permission is hereby granted to use, copy, modify, and distribute this 371 * source code, or portions hereof, for any purpose, without fee, subject 372 * to the following restrictions: 373 * 374 * 1. The origin of this source code must not be misrepresented. 375 * 376 * 2. Altered versions must be plainly marked as such and 377 * must not be misrepresented as being the original source. 378 * 379 * 3. This Copyright notice may not be removed or altered from 380 * any source or altered source distribution. 381 * 382 * The Contributing Authors and Group 42, Inc. specifically permit, without 383 * fee, and encourage the use of this source code as a component to 384 * supporting the PNG file format in commercial products. If you use this 385 * source code in a product, acknowledgment is not required but would be 386 * appreciated. 387 */ 388 389/* 390 * A "png_get_copyright" function is available, for convenient use in "about" 391 * boxes and the like: 392 * 393 * printf("%s",png_get_copyright(NULL)); 394 * 395 * Also, the PNG logo (in PNG format, of course) is supplied in the 396 * files "pngbar.png" and "pngbar.jpg (88x31) and "pngnow.png" (98x31). 397 */ 398 399/* 400 * Libpng is OSI Certified Open Source Software. OSI Certified is a 401 * certification mark of the Open Source Initiative. 402 */ 403 404/* 405 * The contributing authors would like to thank all those who helped 406 * with testing, bug fixes, and patience. This wouldn't have been 407 * possible without all of you. 408 * 409 * Thanks to Frank J. T. Wojcik for helping with the documentation. 410 */ 411 412/* 413 * Y2K compliance in libpng: 414 * ========================= 415 * 416 * July 9, 2011 417 * 418 * Since the PNG Development group is an ad-hoc body, we can't make 419 * an official declaration. 420 * 421 * This is your unofficial assurance that libpng from version 0.71 and 422 * upward through 1.2.46 are Y2K compliant. It is my belief that earlier 423 * versions were also Y2K compliant. 424 * 425 * Libpng only has three year fields. One is a 2-byte unsigned integer 426 * that will hold years up to 65535. The other two hold the date in text 427 * format, and will hold years up to 9999. 428 * 429 * The integer is 430 * "png_uint_16 year" in png_time_struct. 431 * 432 * The strings are 433 * "png_charp time_buffer" in png_struct and 434 * "near_time_buffer", which is a local character string in png.c. 435 * 436 * There are seven time-related functions: 437 * png.c: png_convert_to_rfc_1123() in png.c 438 * (formerly png_convert_to_rfc_1152() in error) 439 * png_convert_from_struct_tm() in pngwrite.c, called in pngwrite.c 440 * png_convert_from_time_t() in pngwrite.c 441 * png_get_tIME() in pngget.c 442 * png_handle_tIME() in pngrutil.c, called in pngread.c 443 * png_set_tIME() in pngset.c 444 * png_write_tIME() in pngwutil.c, called in pngwrite.c 445 * 446 * All handle dates properly in a Y2K environment. The 447 * png_convert_from_time_t() function calls gmtime() to convert from system 448 * clock time, which returns (year - 1900), which we properly convert to 449 * the full 4-digit year. There is a possibility that applications using 450 * libpng are not passing 4-digit years into the png_convert_to_rfc_1123() 451 * function, or that they are incorrectly passing only a 2-digit year 452 * instead of "year - 1900" into the png_convert_from_struct_tm() function, 453 * but this is not under our control. The libpng documentation has always 454 * stated that it works with 4-digit years, and the APIs have been 455 * documented as such. 456 * 457 * The tIME chunk itself is also Y2K compliant. It uses a 2-byte unsigned 458 * integer to hold the year, and can hold years as large as 65535. 459 * 460 * zlib, upon which libpng depends, is also Y2K compliant. It contains 461 * no date-related code. 462 * 463 * Glenn Randers-Pehrson 464 * libpng maintainer 465 * PNG Development Group 466 */ 467 468#ifndef PNG_H 469#define PNG_H 470 471/* This is not the place to learn how to use libpng. The file libpng.txt 472 * describes how to use libpng, and the file example.c summarizes it 473 * with some code on which to build. This file is useful for looking 474 * at the actual function definitions and structure components. 475 */ 476 477/* Version information for png.h - this should match the version in png.c */ 478#define PNG_LIBPNG_VER_STRING "1.2.46" 479#define PNG_HEADER_VERSION_STRING \ 480 " libpng version 1.2.46 - July 9, 2011\n" 481 482#define PNG_LIBPNG_VER_SONUM 0 483#define PNG_LIBPNG_VER_DLLNUM 13 484 485/* These should match the first 3 components of PNG_LIBPNG_VER_STRING: */ 486#define PNG_LIBPNG_VER_MAJOR 1 487#define PNG_LIBPNG_VER_MINOR 2 488#define PNG_LIBPNG_VER_RELEASE 46 489/* This should match the numeric part of the final component of 490 * PNG_LIBPNG_VER_STRING, omitting any leading zero: 491 */ 492 493#define PNG_LIBPNG_VER_BUILD 0 494 495/* Release Status */ 496#define PNG_LIBPNG_BUILD_ALPHA 1 497#define PNG_LIBPNG_BUILD_BETA 2 498#define PNG_LIBPNG_BUILD_RC 3 499#define PNG_LIBPNG_BUILD_STABLE 4 500#define PNG_LIBPNG_BUILD_RELEASE_STATUS_MASK 7 501 502/* Release-Specific Flags */ 503#define PNG_LIBPNG_BUILD_PATCH 8 /* Can be OR'ed with 504 PNG_LIBPNG_BUILD_STABLE only */ 505#define PNG_LIBPNG_BUILD_PRIVATE 16 /* Cannot be OR'ed with 506 PNG_LIBPNG_BUILD_SPECIAL */ 507#define PNG_LIBPNG_BUILD_SPECIAL 32 /* Cannot be OR'ed with 508 PNG_LIBPNG_BUILD_PRIVATE */ 509 510#define PNG_LIBPNG_BUILD_BASE_TYPE PNG_LIBPNG_BUILD_STABLE 511 512/* Careful here. At one time, Guy wanted to use 082, but that would be octal. 513 * We must not include leading zeros. 514 * Versions 0.7 through 1.0.0 were in the range 0 to 100 here (only 515 * version 1.0.0 was mis-numbered 100 instead of 10000). From 516 * version 1.0.1 it's xxyyzz, where x=major, y=minor, z=release 517 */ 518#define PNG_LIBPNG_VER 10246 /* 1.2.46 */ 519 520#ifndef PNG_VERSION_INFO_ONLY 521/* Include the compression library's header */ 522#include "zlib.h" 523#endif 524 525/* Include all user configurable info, including optional assembler routines */ 526#include "pngconf.h" 527 528/* 529 * Added at libpng-1.2.8 */ 530/* Ref MSDN: Private as priority over Special 531 * VS_FF_PRIVATEBUILD File *was not* built using standard release 532 * procedures. If this value is given, the StringFileInfo block must 533 * contain a PrivateBuild string. 534 * 535 * VS_FF_SPECIALBUILD File *was* built by the original company using 536 * standard release procedures but is a variation of the standard 537 * file of the same version number. If this value is given, the 538 * StringFileInfo block must contain a SpecialBuild string. 539 */ 540 541#ifdef PNG_USER_PRIVATEBUILD 542# define PNG_LIBPNG_BUILD_TYPE \ 543 (PNG_LIBPNG_BUILD_BASE_TYPE | PNG_LIBPNG_BUILD_PRIVATE) 544#else 545# ifdef PNG_LIBPNG_SPECIALBUILD 546# define PNG_LIBPNG_BUILD_TYPE \ 547 (PNG_LIBPNG_BUILD_BASE_TYPE | PNG_LIBPNG_BUILD_SPECIAL) 548# else 549# define PNG_LIBPNG_BUILD_TYPE (PNG_LIBPNG_BUILD_BASE_TYPE) 550# endif 551#endif 552 553#ifndef PNG_VERSION_INFO_ONLY 554 555/* Inhibit C++ name-mangling for libpng functions but not for system calls. */ 556#ifdef __cplusplus 557extern "C" { 558#endif /* __cplusplus */ 559 560/* This file is arranged in several sections. The first section contains 561 * structure and type definitions. The second section contains the external 562 * library functions, while the third has the internal library functions, 563 * which applications aren't expected to use directly. 564 */ 565 566#ifndef PNG_NO_TYPECAST_NULL 567#define int_p_NULL (int *)NULL 568#define png_bytep_NULL (png_bytep)NULL 569#define png_bytepp_NULL (png_bytepp)NULL 570#define png_doublep_NULL (png_doublep)NULL 571#define png_error_ptr_NULL (png_error_ptr)NULL 572#define png_flush_ptr_NULL (png_flush_ptr)NULL 573#define png_free_ptr_NULL (png_free_ptr)NULL 574#define png_infopp_NULL (png_infopp)NULL 575#define png_malloc_ptr_NULL (png_malloc_ptr)NULL 576#define png_read_status_ptr_NULL (png_read_status_ptr)NULL 577#define png_rw_ptr_NULL (png_rw_ptr)NULL 578#define png_structp_NULL (png_structp)NULL 579#define png_uint_16p_NULL (png_uint_16p)NULL 580#define png_voidp_NULL (png_voidp)NULL 581#define png_write_status_ptr_NULL (png_write_status_ptr)NULL 582#else 583#define int_p_NULL NULL 584#define png_bytep_NULL NULL 585#define png_bytepp_NULL NULL 586#define png_doublep_NULL NULL 587#define png_error_ptr_NULL NULL 588#define png_flush_ptr_NULL NULL 589#define png_free_ptr_NULL NULL 590#define png_infopp_NULL NULL 591#define png_malloc_ptr_NULL NULL 592#define png_read_status_ptr_NULL NULL 593#define png_rw_ptr_NULL NULL 594#define png_structp_NULL NULL 595#define png_uint_16p_NULL NULL 596#define png_voidp_NULL NULL 597#define png_write_status_ptr_NULL NULL 598#endif 599 600/* Variables declared in png.c - only it needs to define PNG_NO_EXTERN */ 601#if !defined(PNG_NO_EXTERN) || defined(PNG_ALWAYS_EXTERN) 602/* Version information for C files, stored in png.c. This had better match 603 * the version above. 604 */ 605#ifdef PNG_USE_GLOBAL_ARRAYS 606PNG_EXPORT_VAR (PNG_CONST char) png_libpng_ver[18]; 607 /* Need room for 99.99.99beta99z */ 608#else 609#define png_libpng_ver png_get_header_ver(NULL) 610#endif 611 612#ifdef PNG_USE_GLOBAL_ARRAYS 613/* This was removed in version 1.0.5c */ 614/* Structures to facilitate easy interlacing. See png.c for more details */ 615PNG_EXPORT_VAR (PNG_CONST int FARDATA) png_pass_start[7]; 616PNG_EXPORT_VAR (PNG_CONST int FARDATA) png_pass_inc[7]; 617PNG_EXPORT_VAR (PNG_CONST int FARDATA) png_pass_ystart[7]; 618PNG_EXPORT_VAR (PNG_CONST int FARDATA) png_pass_yinc[7]; 619PNG_EXPORT_VAR (PNG_CONST int FARDATA) png_pass_mask[7]; 620PNG_EXPORT_VAR (PNG_CONST int FARDATA) png_pass_dsp_mask[7]; 621/* This isn't currently used. If you need it, see png.c for more details. 622PNG_EXPORT_VAR (PNG_CONST int FARDATA) png_pass_height[7]; 623*/ 624#endif 625 626#endif /* PNG_NO_EXTERN */ 627 628/* Three color definitions. The order of the red, green, and blue, (and the 629 * exact size) is not important, although the size of the fields need to 630 * be png_byte or png_uint_16 (as defined below). 631 */ 632typedef struct png_color_struct 633{ 634 png_byte red; 635 png_byte green; 636 png_byte blue; 637} png_color; 638typedef png_color FAR * png_colorp; 639typedef png_color FAR * FAR * png_colorpp; 640 641typedef struct png_color_16_struct 642{ 643 png_byte index; /* used for palette files */ 644 png_uint_16 red; /* for use in red green blue files */ 645 png_uint_16 green; 646 png_uint_16 blue; 647 png_uint_16 gray; /* for use in grayscale files */ 648} png_color_16; 649typedef png_color_16 FAR * png_color_16p; 650typedef png_color_16 FAR * FAR * png_color_16pp; 651 652typedef struct png_color_8_struct 653{ 654 png_byte red; /* for use in red green blue files */ 655 png_byte green; 656 png_byte blue; 657 png_byte gray; /* for use in grayscale files */ 658 png_byte alpha; /* for alpha channel files */ 659} png_color_8; 660typedef png_color_8 FAR * png_color_8p; 661typedef png_color_8 FAR * FAR * png_color_8pp; 662 663/* 664 * The following two structures are used for the in-core representation 665 * of sPLT chunks. 666 */ 667typedef struct png_sPLT_entry_struct 668{ 669 png_uint_16 red; 670 png_uint_16 green; 671 png_uint_16 blue; 672 png_uint_16 alpha; 673 png_uint_16 frequency; 674} png_sPLT_entry; 675typedef png_sPLT_entry FAR * png_sPLT_entryp; 676typedef png_sPLT_entry FAR * FAR * png_sPLT_entrypp; 677 678/* When the depth of the sPLT palette is 8 bits, the color and alpha samples 679 * occupy the LSB of their respective members, and the MSB of each member 680 * is zero-filled. The frequency member always occupies the full 16 bits. 681 */ 682 683typedef struct png_sPLT_struct 684{ 685 png_charp name; /* palette name */ 686 png_byte depth; /* depth of palette samples */ 687 png_sPLT_entryp entries; /* palette entries */ 688 png_int_32 nentries; /* number of palette entries */ 689} png_sPLT_t; 690typedef png_sPLT_t FAR * png_sPLT_tp; 691typedef png_sPLT_t FAR * FAR * png_sPLT_tpp; 692 693#ifdef PNG_TEXT_SUPPORTED 694/* png_text holds the contents of a text/ztxt/itxt chunk in a PNG file, 695 * and whether that contents is compressed or not. The "key" field 696 * points to a regular zero-terminated C string. The "text", "lang", and 697 * "lang_key" fields can be regular C strings, empty strings, or NULL pointers. 698 * However, the * structure returned by png_get_text() will always contain 699 * regular zero-terminated C strings (possibly empty), never NULL pointers, 700 * so they can be safely used in printf() and other string-handling functions. 701 */ 702typedef struct png_text_struct 703{ 704 int compression; /* compression value: 705 -1: tEXt, none 706 0: zTXt, deflate 707 1: iTXt, none 708 2: iTXt, deflate */ 709 png_charp key; /* keyword, 1-79 character description of "text" */ 710 png_charp text; /* comment, may be an empty string (ie "") 711 or a NULL pointer */ 712 png_size_t text_length; /* length of the text string */ 713#ifdef PNG_iTXt_SUPPORTED 714 png_size_t itxt_length; /* length of the itxt string */ 715 png_charp lang; /* language code, 0-79 characters 716 or a NULL pointer */ 717 png_charp lang_key; /* keyword translated UTF-8 string, 0 or more 718 chars or a NULL pointer */ 719#endif 720} png_text; 721typedef png_text FAR * png_textp; 722typedef png_text FAR * FAR * png_textpp; 723#endif 724 725/* Supported compression types for text in PNG files (tEXt, and zTXt). 726 * The values of the PNG_TEXT_COMPRESSION_ defines should NOT be changed. 727 */ 728#define PNG_TEXT_COMPRESSION_NONE_WR -3 729#define PNG_TEXT_COMPRESSION_zTXt_WR -2 730#define PNG_TEXT_COMPRESSION_NONE -1 731#define PNG_TEXT_COMPRESSION_zTXt 0 732#define PNG_ITXT_COMPRESSION_NONE 1 733#define PNG_ITXT_COMPRESSION_zTXt 2 734#define PNG_TEXT_COMPRESSION_LAST 3 /* Not a valid value */ 735 736/* png_time is a way to hold the time in an machine independent way. 737 * Two conversions are provided, both from time_t and struct tm. There 738 * is no portable way to convert to either of these structures, as far 739 * as I know. If you know of a portable way, send it to me. As a side 740 * note - PNG has always been Year 2000 compliant! 741 */ 742typedef struct png_time_struct 743{ 744 png_uint_16 year; /* full year, as in, 1995 */ 745 png_byte month; /* month of year, 1 - 12 */ 746 png_byte day; /* day of month, 1 - 31 */ 747 png_byte hour; /* hour of day, 0 - 23 */ 748 png_byte minute; /* minute of hour, 0 - 59 */ 749 png_byte second; /* second of minute, 0 - 60 (for leap seconds) */ 750} png_time; 751typedef png_time FAR * png_timep; 752typedef png_time FAR * FAR * png_timepp; 753 754#if defined(PNG_UNKNOWN_CHUNKS_SUPPORTED) || \ 755 defined(PNG_HANDLE_AS_UNKNOWN_SUPPORTED) 756/* png_unknown_chunk is a structure to hold queued chunks for which there is 757 * no specific support. The idea is that we can use this to queue 758 * up private chunks for output even though the library doesn't actually 759 * know about their semantics. 760 */ 761#define PNG_CHUNK_NAME_LENGTH 5 762typedef struct png_unknown_chunk_t 763{ 764 png_byte name[PNG_CHUNK_NAME_LENGTH]; 765 png_byte *data; 766 png_size_t size; 767 768 /* libpng-using applications should NOT directly modify this byte. */ 769 png_byte location; /* mode of operation at read time */ 770} 771png_unknown_chunk; 772typedef png_unknown_chunk FAR * png_unknown_chunkp; 773typedef png_unknown_chunk FAR * FAR * png_unknown_chunkpp; 774#endif 775 776#ifdef PNG_INDEX_SUPPORTED 777/* png_line_index_struct records an index point, where we impose an index point 778 * to be located at the beginning of a line for simplifying the implementation. 779 */ 780typedef struct png_line_index_struct 781{ 782 // state of the lz decoder 783 z_streamp z_state; 784 785 // the IDAT header position of the chunk, which the index point is in 786 png_uint_32 stream_idat_position; 787 788 // we intend to record the offset of the index point in the chunk, 789 // but we record the number of remaining bytes in the chunk after the 790 // index point. That's because PNG processes a chunk this way. 791 png_uint_32 bytes_left_in_idat; 792 793 // decompressed data of the previous row 794 png_bytep prev_row; 795} png_line_index; 796typedef png_line_index FAR * png_line_indexp; 797 798typedef struct png_index_struct 799{ 800 // A temporary variable used when we build the index. The variable records 801 // the IDAT header position of the last chunk read in so far. 802 png_uint_32 stream_idat_position; 803 804 // line index information about each passes 805 806 // the number of index points in each pass 807 png_uint_32 size[7]; 808 809 // the line span of two index points of each pass 810 png_uint_32 step[7]; 811 812 // the index points of each pass 813 png_line_indexp *pass_line_index[7]; 814} png_index; 815typedef png_index FAR * png_indexp; 816 817#define INDEX_SAMPLE_SIZE 254 818#endif 819 820/* png_info is a structure that holds the information in a PNG file so 821 * that the application can find out the characteristics of the image. 822 * If you are reading the file, this structure will tell you what is 823 * in the PNG file. If you are writing the file, fill in the information 824 * you want to put into the PNG file, then call png_write_info(). 825 * The names chosen should be very close to the PNG specification, so 826 * consult that document for information about the meaning of each field. 827 * 828 * With libpng < 0.95, it was only possible to directly set and read the 829 * the values in the png_info_struct, which meant that the contents and 830 * order of the values had to remain fixed. With libpng 0.95 and later, 831 * however, there are now functions that abstract the contents of 832 * png_info_struct from the application, so this makes it easier to use 833 * libpng with dynamic libraries, and even makes it possible to use 834 * libraries that don't have all of the libpng ancillary chunk-handing 835 * functionality. 836 * 837 * In any case, the order of the parameters in png_info_struct should NOT 838 * be changed for as long as possible to keep compatibility with applications 839 * that use the old direct-access method with png_info_struct. 840 * 841 * The following members may have allocated storage attached that should be 842 * cleaned up before the structure is discarded: palette, trans, text, 843 * pcal_purpose, pcal_units, pcal_params, hist, iccp_name, iccp_profile, 844 * splt_palettes, scal_unit, row_pointers, and unknowns. By default, these 845 * are automatically freed when the info structure is deallocated, if they were 846 * allocated internally by libpng. This behavior can be changed by means 847 * of the png_data_freer() function. 848 * 849 * More allocation details: all the chunk-reading functions that 850 * change these members go through the corresponding png_set_* 851 * functions. A function to clear these members is available: see 852 * png_free_data(). The png_set_* functions do not depend on being 853 * able to point info structure members to any of the storage they are 854 * passed (they make their own copies), EXCEPT that the png_set_text 855 * functions use the same storage passed to them in the text_ptr or 856 * itxt_ptr structure argument, and the png_set_rows and png_set_unknowns 857 * functions do not make their own copies. 858 */ 859typedef struct png_info_struct 860{ 861 /* The following are necessary for every PNG file */ 862 png_uint_32 width PNG_DEPSTRUCT; /* width of image in pixels (from IHDR) */ 863 png_uint_32 height PNG_DEPSTRUCT; /* height of image in pixels (from IHDR) */ 864 png_uint_32 valid PNG_DEPSTRUCT; /* valid chunk data (see PNG_INFO_ below) */ 865 png_uint_32 rowbytes PNG_DEPSTRUCT; /* bytes needed to hold an untransformed row */ 866 png_colorp palette PNG_DEPSTRUCT; /* array of color values (valid & PNG_INFO_PLTE) */ 867 png_uint_16 num_palette PNG_DEPSTRUCT; /* number of color entries in "palette" (PLTE) */ 868 png_uint_16 num_trans PNG_DEPSTRUCT; /* number of transparent palette color (tRNS) */ 869 png_byte bit_depth PNG_DEPSTRUCT; /* 1, 2, 4, 8, or 16 bits/channel (from IHDR) */ 870 png_byte color_type PNG_DEPSTRUCT; /* see PNG_COLOR_TYPE_ below (from IHDR) */ 871 /* The following three should have been named *_method not *_type */ 872 png_byte compression_type PNG_DEPSTRUCT; /* must be PNG_COMPRESSION_TYPE_BASE (IHDR) */ 873 png_byte filter_type PNG_DEPSTRUCT; /* must be PNG_FILTER_TYPE_BASE (from IHDR) */ 874 png_byte interlace_type PNG_DEPSTRUCT; /* One of PNG_INTERLACE_NONE, PNG_INTERLACE_ADAM7 */ 875 876 /* The following is informational only on read, and not used on writes. */ 877 png_byte channels PNG_DEPSTRUCT; /* number of data channels per pixel (1, 2, 3, 4) */ 878 png_byte pixel_depth PNG_DEPSTRUCT; /* number of bits per pixel */ 879 png_byte spare_byte PNG_DEPSTRUCT; /* to align the data, and for future use */ 880 png_byte signature[8] PNG_DEPSTRUCT; /* magic bytes read by libpng from start of file */ 881 882 /* The rest of the data is optional. If you are reading, check the 883 * valid field to see if the information in these are valid. If you 884 * are writing, set the valid field to those chunks you want written, 885 * and initialize the appropriate fields below. 886 */ 887 888#if defined(PNG_gAMA_SUPPORTED) && defined(PNG_FLOATING_POINT_SUPPORTED) 889 /* The gAMA chunk describes the gamma characteristics of the system 890 * on which the image was created, normally in the range [1.0, 2.5]. 891 * Data is valid if (valid & PNG_INFO_gAMA) is non-zero. 892 */ 893 float gamma PNG_DEPSTRUCT; /* gamma value of image, if (valid & PNG_INFO_gAMA) */ 894#endif 895 896#ifdef PNG_sRGB_SUPPORTED 897 /* GR-P, 0.96a */ 898 /* Data valid if (valid & PNG_INFO_sRGB) non-zero. */ 899 png_byte srgb_intent PNG_DEPSTRUCT; /* sRGB rendering intent [0, 1, 2, or 3] */ 900#endif 901 902#ifdef PNG_TEXT_SUPPORTED 903 /* The tEXt, and zTXt chunks contain human-readable textual data in 904 * uncompressed, compressed, and optionally compressed forms, respectively. 905 * The data in "text" is an array of pointers to uncompressed, 906 * null-terminated C strings. Each chunk has a keyword that describes the 907 * textual data contained in that chunk. Keywords are not required to be 908 * unique, and the text string may be empty. Any number of text chunks may 909 * be in an image. 910 */ 911 int num_text PNG_DEPSTRUCT; /* number of comments read/to write */ 912 int max_text PNG_DEPSTRUCT; /* current size of text array */ 913 png_textp text PNG_DEPSTRUCT; /* array of comments read/to write */ 914#endif /* PNG_TEXT_SUPPORTED */ 915 916#ifdef PNG_tIME_SUPPORTED 917 /* The tIME chunk holds the last time the displayed image data was 918 * modified. See the png_time struct for the contents of this struct. 919 */ 920 png_time mod_time PNG_DEPSTRUCT; 921#endif 922 923#ifdef PNG_sBIT_SUPPORTED 924 /* The sBIT chunk specifies the number of significant high-order bits 925 * in the pixel data. Values are in the range [1, bit_depth], and are 926 * only specified for the channels in the pixel data. The contents of 927 * the low-order bits is not specified. Data is valid if 928 * (valid & PNG_INFO_sBIT) is non-zero. 929 */ 930 png_color_8 sig_bit PNG_DEPSTRUCT; /* significant bits in color channels */ 931#endif 932 933#if defined(PNG_tRNS_SUPPORTED) || defined(PNG_READ_EXPAND_SUPPORTED) || \ 934defined(PNG_READ_BACKGROUND_SUPPORTED) 935 /* The tRNS chunk supplies transparency data for paletted images and 936 * other image types that don't need a full alpha channel. There are 937 * "num_trans" transparency values for a paletted image, stored in the 938 * same order as the palette colors, starting from index 0. Values 939 * for the data are in the range [0, 255], ranging from fully transparent 940 * to fully opaque, respectively. For non-paletted images, there is a 941 * single color specified that should be treated as fully transparent. 942 * Data is valid if (valid & PNG_INFO_tRNS) is non-zero. 943 */ 944 png_bytep trans PNG_DEPSTRUCT; /* transparent values for paletted image */ 945 png_color_16 trans_values PNG_DEPSTRUCT; /* transparent color for non-palette image */ 946#endif 947 948#if defined(PNG_bKGD_SUPPORTED) || defined(PNG_READ_BACKGROUND_SUPPORTED) 949 /* The bKGD chunk gives the suggested image background color if the 950 * display program does not have its own background color and the image 951 * is needs to composited onto a background before display. The colors 952 * in "background" are normally in the same color space/depth as the 953 * pixel data. Data is valid if (valid & PNG_INFO_bKGD) is non-zero. 954 */ 955 png_color_16 background PNG_DEPSTRUCT; 956#endif 957 958#ifdef PNG_oFFs_SUPPORTED 959 /* The oFFs chunk gives the offset in "offset_unit_type" units rightwards 960 * and downwards from the top-left corner of the display, page, or other 961 * application-specific co-ordinate space. See the PNG_OFFSET_ defines 962 * below for the unit types. Valid if (valid & PNG_INFO_oFFs) non-zero. 963 */ 964 png_int_32 x_offset PNG_DEPSTRUCT; /* x offset on page */ 965 png_int_32 y_offset PNG_DEPSTRUCT; /* y offset on page */ 966 png_byte offset_unit_type PNG_DEPSTRUCT; /* offset units type */ 967#endif 968 969#ifdef PNG_pHYs_SUPPORTED 970 /* The pHYs chunk gives the physical pixel density of the image for 971 * display or printing in "phys_unit_type" units (see PNG_RESOLUTION_ 972 * defines below). Data is valid if (valid & PNG_INFO_pHYs) is non-zero. 973 */ 974 png_uint_32 x_pixels_per_unit PNG_DEPSTRUCT; /* horizontal pixel density */ 975 png_uint_32 y_pixels_per_unit PNG_DEPSTRUCT; /* vertical pixel density */ 976 png_byte phys_unit_type PNG_DEPSTRUCT; /* resolution type (see PNG_RESOLUTION_ below) */ 977#endif 978 979#ifdef PNG_hIST_SUPPORTED 980 /* The hIST chunk contains the relative frequency or importance of the 981 * various palette entries, so that a viewer can intelligently select a 982 * reduced-color palette, if required. Data is an array of "num_palette" 983 * values in the range [0,65535]. Data valid if (valid & PNG_INFO_hIST) 984 * is non-zero. 985 */ 986 png_uint_16p hist PNG_DEPSTRUCT; 987#endif 988 989#ifdef PNG_cHRM_SUPPORTED 990 /* The cHRM chunk describes the CIE color characteristics of the monitor 991 * on which the PNG was created. This data allows the viewer to do gamut 992 * mapping of the input image to ensure that the viewer sees the same 993 * colors in the image as the creator. Values are in the range 994 * [0.0, 0.8]. Data valid if (valid & PNG_INFO_cHRM) non-zero. 995 */ 996#ifdef PNG_FLOATING_POINT_SUPPORTED 997 float x_white PNG_DEPSTRUCT; 998 float y_white PNG_DEPSTRUCT; 999 float x_red PNG_DEPSTRUCT; 1000 float y_red PNG_DEPSTRUCT; 1001 float x_green PNG_DEPSTRUCT; 1002 float y_green PNG_DEPSTRUCT; 1003 float x_blue PNG_DEPSTRUCT; 1004 float y_blue PNG_DEPSTRUCT; 1005#endif 1006#endif 1007 1008#ifdef PNG_pCAL_SUPPORTED 1009 /* The pCAL chunk describes a transformation between the stored pixel 1010 * values and original physical data values used to create the image. 1011 * The integer range [0, 2^bit_depth - 1] maps to the floating-point 1012 * range given by [pcal_X0, pcal_X1], and are further transformed by a 1013 * (possibly non-linear) transformation function given by "pcal_type" 1014 * and "pcal_params" into "pcal_units". Please see the PNG_EQUATION_ 1015 * defines below, and the PNG-Group's PNG extensions document for a 1016 * complete description of the transformations and how they should be 1017 * implemented, and for a description of the ASCII parameter strings. 1018 * Data values are valid if (valid & PNG_INFO_pCAL) non-zero. 1019 */ 1020 png_charp pcal_purpose PNG_DEPSTRUCT; /* pCAL chunk description string */ 1021 png_int_32 pcal_X0 PNG_DEPSTRUCT; /* minimum value */ 1022 png_int_32 pcal_X1 PNG_DEPSTRUCT; /* maximum value */ 1023 png_charp pcal_units PNG_DEPSTRUCT; /* Latin-1 string giving physical units */ 1024 png_charpp pcal_params PNG_DEPSTRUCT; /* ASCII strings containing parameter values */ 1025 png_byte pcal_type PNG_DEPSTRUCT; /* equation type (see PNG_EQUATION_ below) */ 1026 png_byte pcal_nparams PNG_DEPSTRUCT; /* number of parameters given in pcal_params */ 1027#endif 1028 1029/* New members added in libpng-1.0.6 */ 1030#ifdef PNG_FREE_ME_SUPPORTED 1031 png_uint_32 free_me PNG_DEPSTRUCT; /* flags items libpng is responsible for freeing */ 1032#endif 1033 1034#if defined(PNG_UNKNOWN_CHUNKS_SUPPORTED) || \ 1035 defined(PNG_HANDLE_AS_UNKNOWN_SUPPORTED) 1036 /* Storage for unknown chunks that the library doesn't recognize. */ 1037 png_unknown_chunkp unknown_chunks PNG_DEPSTRUCT; 1038 png_size_t unknown_chunks_num PNG_DEPSTRUCT; 1039#endif 1040 1041#ifdef PNG_iCCP_SUPPORTED 1042 /* iCCP chunk data. */ 1043 png_charp iccp_name PNG_DEPSTRUCT; /* profile name */ 1044 png_charp iccp_profile PNG_DEPSTRUCT; /* International Color Consortium profile data */ 1045 /* Note to maintainer: should be png_bytep */ 1046 png_uint_32 iccp_proflen PNG_DEPSTRUCT; /* ICC profile data length */ 1047 png_byte iccp_compression PNG_DEPSTRUCT; /* Always zero */ 1048#endif 1049 1050#ifdef PNG_sPLT_SUPPORTED 1051 /* Data on sPLT chunks (there may be more than one). */ 1052 png_sPLT_tp splt_palettes PNG_DEPSTRUCT; 1053 png_uint_32 splt_palettes_num PNG_DEPSTRUCT; 1054#endif 1055 1056#ifdef PNG_sCAL_SUPPORTED 1057 /* The sCAL chunk describes the actual physical dimensions of the 1058 * subject matter of the graphic. The chunk contains a unit specification 1059 * a byte value, and two ASCII strings representing floating-point 1060 * values. The values are width and height corresponsing to one pixel 1061 * in the image. This external representation is converted to double 1062 * here. Data values are valid if (valid & PNG_INFO_sCAL) is non-zero. 1063 */ 1064 png_byte scal_unit PNG_DEPSTRUCT; /* unit of physical scale */ 1065#ifdef PNG_FLOATING_POINT_SUPPORTED 1066 double scal_pixel_width PNG_DEPSTRUCT; /* width of one pixel */ 1067 double scal_pixel_height PNG_DEPSTRUCT; /* height of one pixel */ 1068#endif 1069#ifdef PNG_FIXED_POINT_SUPPORTED 1070 png_charp scal_s_width PNG_DEPSTRUCT; /* string containing height */ 1071 png_charp scal_s_height PNG_DEPSTRUCT; /* string containing width */ 1072#endif 1073#endif 1074 1075#ifdef PNG_INFO_IMAGE_SUPPORTED 1076 /* Memory has been allocated if (valid & PNG_ALLOCATED_INFO_ROWS) non-zero */ 1077 /* Data valid if (valid & PNG_INFO_IDAT) non-zero */ 1078 png_bytepp row_pointers PNG_DEPSTRUCT; /* the image bits */ 1079#endif 1080 1081#if defined(PNG_FIXED_POINT_SUPPORTED) && defined(PNG_gAMA_SUPPORTED) 1082 png_fixed_point int_gamma PNG_DEPSTRUCT; /* gamma of image, if (valid & PNG_INFO_gAMA) */ 1083#endif 1084 1085#if defined(PNG_cHRM_SUPPORTED) && defined(PNG_FIXED_POINT_SUPPORTED) 1086 png_fixed_point int_x_white PNG_DEPSTRUCT; 1087 png_fixed_point int_y_white PNG_DEPSTRUCT; 1088 png_fixed_point int_x_red PNG_DEPSTRUCT; 1089 png_fixed_point int_y_red PNG_DEPSTRUCT; 1090 png_fixed_point int_x_green PNG_DEPSTRUCT; 1091 png_fixed_point int_y_green PNG_DEPSTRUCT; 1092 png_fixed_point int_x_blue PNG_DEPSTRUCT; 1093 png_fixed_point int_y_blue PNG_DEPSTRUCT; 1094#endif 1095 1096} png_info; 1097 1098typedef png_info FAR * png_infop; 1099typedef png_info FAR * FAR * png_infopp; 1100 1101/* Maximum positive integer used in PNG is (2^31)-1 */ 1102#define PNG_UINT_31_MAX ((png_uint_32)0x7fffffffL) 1103#define PNG_UINT_32_MAX ((png_uint_32)(-1)) 1104#define PNG_SIZE_MAX ((png_size_t)(-1)) 1105#if defined(PNG_1_0_X) || defined (PNG_1_2_X) 1106/* PNG_MAX_UINT is deprecated; use PNG_UINT_31_MAX instead. */ 1107#define PNG_MAX_UINT PNG_UINT_31_MAX 1108#endif 1109 1110/* These describe the color_type field in png_info. */ 1111/* color type masks */ 1112#define PNG_COLOR_MASK_PALETTE 1 1113#define PNG_COLOR_MASK_COLOR 2 1114#define PNG_COLOR_MASK_ALPHA 4 1115 1116/* color types. Note that not all combinations are legal */ 1117#define PNG_COLOR_TYPE_GRAY 0 1118#define PNG_COLOR_TYPE_PALETTE (PNG_COLOR_MASK_COLOR | PNG_COLOR_MASK_PALETTE) 1119#define PNG_COLOR_TYPE_RGB (PNG_COLOR_MASK_COLOR) 1120#define PNG_COLOR_TYPE_RGB_ALPHA (PNG_COLOR_MASK_COLOR | PNG_COLOR_MASK_ALPHA) 1121#define PNG_COLOR_TYPE_GRAY_ALPHA (PNG_COLOR_MASK_ALPHA) 1122/* aliases */ 1123#define PNG_COLOR_TYPE_RGBA PNG_COLOR_TYPE_RGB_ALPHA 1124#define PNG_COLOR_TYPE_GA PNG_COLOR_TYPE_GRAY_ALPHA 1125 1126/* This is for compression type. PNG 1.0-1.2 only define the single type. */ 1127#define PNG_COMPRESSION_TYPE_BASE 0 /* Deflate method 8, 32K window */ 1128#define PNG_COMPRESSION_TYPE_DEFAULT PNG_COMPRESSION_TYPE_BASE 1129 1130/* This is for filter type. PNG 1.0-1.2 only define the single type. */ 1131#define PNG_FILTER_TYPE_BASE 0 /* Single row per-byte filtering */ 1132#define PNG_INTRAPIXEL_DIFFERENCING 64 /* Used only in MNG datastreams */ 1133#define PNG_FILTER_TYPE_DEFAULT PNG_FILTER_TYPE_BASE 1134 1135/* These are for the interlacing type. These values should NOT be changed. */ 1136#define PNG_INTERLACE_NONE 0 /* Non-interlaced image */ 1137#define PNG_INTERLACE_ADAM7 1 /* Adam7 interlacing */ 1138#define PNG_INTERLACE_LAST 2 /* Not a valid value */ 1139 1140/* These are for the oFFs chunk. These values should NOT be changed. */ 1141#define PNG_OFFSET_PIXEL 0 /* Offset in pixels */ 1142#define PNG_OFFSET_MICROMETER 1 /* Offset in micrometers (1/10^6 meter) */ 1143#define PNG_OFFSET_LAST 2 /* Not a valid value */ 1144 1145/* These are for the pCAL chunk. These values should NOT be changed. */ 1146#define PNG_EQUATION_LINEAR 0 /* Linear transformation */ 1147#define PNG_EQUATION_BASE_E 1 /* Exponential base e transform */ 1148#define PNG_EQUATION_ARBITRARY 2 /* Arbitrary base exponential transform */ 1149#define PNG_EQUATION_HYPERBOLIC 3 /* Hyperbolic sine transformation */ 1150#define PNG_EQUATION_LAST 4 /* Not a valid value */ 1151 1152/* These are for the sCAL chunk. These values should NOT be changed. */ 1153#define PNG_SCALE_UNKNOWN 0 /* unknown unit (image scale) */ 1154#define PNG_SCALE_METER 1 /* meters per pixel */ 1155#define PNG_SCALE_RADIAN 2 /* radians per pixel */ 1156#define PNG_SCALE_LAST 3 /* Not a valid value */ 1157 1158/* These are for the pHYs chunk. These values should NOT be changed. */ 1159#define PNG_RESOLUTION_UNKNOWN 0 /* pixels/unknown unit (aspect ratio) */ 1160#define PNG_RESOLUTION_METER 1 /* pixels/meter */ 1161#define PNG_RESOLUTION_LAST 2 /* Not a valid value */ 1162 1163/* These are for the sRGB chunk. These values should NOT be changed. */ 1164#define PNG_sRGB_INTENT_PERCEPTUAL 0 1165#define PNG_sRGB_INTENT_RELATIVE 1 1166#define PNG_sRGB_INTENT_SATURATION 2 1167#define PNG_sRGB_INTENT_ABSOLUTE 3 1168#define PNG_sRGB_INTENT_LAST 4 /* Not a valid value */ 1169 1170/* This is for text chunks */ 1171#define PNG_KEYWORD_MAX_LENGTH 79 1172 1173/* Maximum number of entries in PLTE/sPLT/tRNS arrays */ 1174#define PNG_MAX_PALETTE_LENGTH 256 1175 1176/* These determine if an ancillary chunk's data has been successfully read 1177 * from the PNG header, or if the application has filled in the corresponding 1178 * data in the info_struct to be written into the output file. The values 1179 * of the PNG_INFO_<chunk> defines should NOT be changed. 1180 */ 1181#define PNG_INFO_gAMA 0x0001 1182#define PNG_INFO_sBIT 0x0002 1183#define PNG_INFO_cHRM 0x0004 1184#define PNG_INFO_PLTE 0x0008 1185#define PNG_INFO_tRNS 0x0010 1186#define PNG_INFO_bKGD 0x0020 1187#define PNG_INFO_hIST 0x0040 1188#define PNG_INFO_pHYs 0x0080 1189#define PNG_INFO_oFFs 0x0100 1190#define PNG_INFO_tIME 0x0200 1191#define PNG_INFO_pCAL 0x0400 1192#define PNG_INFO_sRGB 0x0800 /* GR-P, 0.96a */ 1193#define PNG_INFO_iCCP 0x1000 /* ESR, 1.0.6 */ 1194#define PNG_INFO_sPLT 0x2000 /* ESR, 1.0.6 */ 1195#define PNG_INFO_sCAL 0x4000 /* ESR, 1.0.6 */ 1196#define PNG_INFO_IDAT 0x8000L /* ESR, 1.0.6 */ 1197 1198/* This is used for the transformation routines, as some of them 1199 * change these values for the row. It also should enable using 1200 * the routines for other purposes. 1201 */ 1202typedef struct png_row_info_struct 1203{ 1204 png_uint_32 width; /* width of row */ 1205 png_uint_32 rowbytes; /* number of bytes in row */ 1206 png_byte color_type; /* color type of row */ 1207 png_byte bit_depth; /* bit depth of row */ 1208 png_byte channels; /* number of channels (1, 2, 3, or 4) */ 1209 png_byte pixel_depth; /* bits per pixel (depth * channels) */ 1210} png_row_info; 1211 1212typedef png_row_info FAR * png_row_infop; 1213typedef png_row_info FAR * FAR * png_row_infopp; 1214 1215/* These are the function types for the I/O functions and for the functions 1216 * that allow the user to override the default I/O functions with his or her 1217 * own. The png_error_ptr type should match that of user-supplied warning 1218 * and error functions, while the png_rw_ptr type should match that of the 1219 * user read/write data functions. 1220 */ 1221typedef struct png_struct_def png_struct; 1222typedef png_struct FAR * png_structp; 1223 1224typedef void (PNGAPI *png_error_ptr) PNGARG((png_structp, png_const_charp)); 1225typedef void (PNGAPI *png_rw_ptr) PNGARG((png_structp, png_bytep, png_size_t)); 1226#ifdef PNG_INDEX_SUPPORTED 1227typedef void (PNGAPI *png_seek_ptr) PNGARG((png_structp, png_uint_32)); 1228#endif 1229typedef void (PNGAPI *png_flush_ptr) PNGARG((png_structp)); 1230typedef void (PNGAPI *png_read_status_ptr) PNGARG((png_structp, png_uint_32, 1231 int)); 1232typedef void (PNGAPI *png_write_status_ptr) PNGARG((png_structp, png_uint_32, 1233 int)); 1234 1235#ifdef PNG_PROGRESSIVE_READ_SUPPORTED 1236typedef void (PNGAPI *png_progressive_info_ptr) PNGARG((png_structp, png_infop)); 1237typedef void (PNGAPI *png_progressive_end_ptr) PNGARG((png_structp, png_infop)); 1238typedef void (PNGAPI *png_progressive_row_ptr) PNGARG((png_structp, png_bytep, 1239 png_uint_32, int)); 1240#endif 1241 1242#if defined(PNG_READ_USER_TRANSFORM_SUPPORTED) || \ 1243 defined(PNG_WRITE_USER_TRANSFORM_SUPPORTED) || \ 1244 defined(PNG_LEGACY_SUPPORTED) 1245typedef void (PNGAPI *png_user_transform_ptr) PNGARG((png_structp, 1246 png_row_infop, png_bytep)); 1247#endif 1248 1249#ifdef PNG_USER_CHUNKS_SUPPORTED 1250typedef int (PNGAPI *png_user_chunk_ptr) PNGARG((png_structp, png_unknown_chunkp)); 1251#endif 1252#ifdef PNG_UNKNOWN_CHUNKS_SUPPORTED 1253typedef void (PNGAPI *png_unknown_chunk_ptr) PNGARG((png_structp)); 1254#endif 1255 1256/* Transform masks for the high-level interface */ 1257#define PNG_TRANSFORM_IDENTITY 0x0000 /* read and write */ 1258#define PNG_TRANSFORM_STRIP_16 0x0001 /* read only */ 1259#define PNG_TRANSFORM_STRIP_ALPHA 0x0002 /* read only */ 1260#define PNG_TRANSFORM_PACKING 0x0004 /* read and write */ 1261#define PNG_TRANSFORM_PACKSWAP 0x0008 /* read and write */ 1262#define PNG_TRANSFORM_EXPAND 0x0010 /* read only */ 1263#define PNG_TRANSFORM_INVERT_MONO 0x0020 /* read and write */ 1264#define PNG_TRANSFORM_SHIFT 0x0040 /* read and write */ 1265#define PNG_TRANSFORM_BGR 0x0080 /* read and write */ 1266#define PNG_TRANSFORM_SWAP_ALPHA 0x0100 /* read and write */ 1267#define PNG_TRANSFORM_SWAP_ENDIAN 0x0200 /* read and write */ 1268#define PNG_TRANSFORM_INVERT_ALPHA 0x0400 /* read and write */ 1269#define PNG_TRANSFORM_STRIP_FILLER 0x0800 /* write only, deprecated */ 1270/* Added to libpng-1.2.34 */ 1271#define PNG_TRANSFORM_STRIP_FILLER_BEFORE 0x0800 /* write only */ 1272#define PNG_TRANSFORM_STRIP_FILLER_AFTER 0x1000 /* write only */ 1273/* Added to libpng-1.2.41 */ 1274#define PNG_TRANSFORM_GRAY_TO_RGB 0x2000 /* read only */ 1275 1276/* Flags for MNG supported features */ 1277#define PNG_FLAG_MNG_EMPTY_PLTE 0x01 1278#define PNG_FLAG_MNG_FILTER_64 0x04 1279#define PNG_ALL_MNG_FEATURES 0x05 1280 1281typedef png_voidp (*png_malloc_ptr) PNGARG((png_structp, png_size_t)); 1282typedef void (*png_free_ptr) PNGARG((png_structp, png_voidp)); 1283 1284/* The structure that holds the information to read and write PNG files. 1285 * The only people who need to care about what is inside of this are the 1286 * people who will be modifying the library for their own special needs. 1287 * It should NOT be accessed directly by an application, except to store 1288 * the jmp_buf. 1289 */ 1290 1291struct png_struct_def 1292{ 1293#ifdef PNG_SETJMP_SUPPORTED 1294 jmp_buf jmpbuf; /* used in png_error */ 1295#endif 1296 png_error_ptr error_fn PNG_DEPSTRUCT; /* function for printing errors and aborting */ 1297 png_error_ptr warning_fn PNG_DEPSTRUCT; /* function for printing warnings */ 1298 png_voidp error_ptr PNG_DEPSTRUCT; /* user supplied struct for error functions */ 1299 png_rw_ptr write_data_fn PNG_DEPSTRUCT; /* function for writing output data */ 1300 png_rw_ptr read_data_fn PNG_DEPSTRUCT; /* function for reading input data */ 1301#ifdef PNG_INDEX_SUPPORTED 1302 png_seek_ptr seek_data_fn PNG_DEPSTRUCT; /* function for seeking input data */ 1303#endif 1304 png_voidp io_ptr PNG_DEPSTRUCT; /* ptr to application struct for I/O functions */ 1305 1306#ifdef PNG_READ_USER_TRANSFORM_SUPPORTED 1307 png_user_transform_ptr read_user_transform_fn PNG_DEPSTRUCT; /* user read transform */ 1308#endif 1309 1310#ifdef PNG_WRITE_USER_TRANSFORM_SUPPORTED 1311 png_user_transform_ptr write_user_transform_fn PNG_DEPSTRUCT; /* user write transform */ 1312#endif 1313 1314/* These were added in libpng-1.0.2 */ 1315#ifdef PNG_USER_TRANSFORM_PTR_SUPPORTED 1316#if defined(PNG_READ_USER_TRANSFORM_SUPPORTED) || \ 1317 defined(PNG_WRITE_USER_TRANSFORM_SUPPORTED) 1318 png_voidp user_transform_ptr PNG_DEPSTRUCT; /* user supplied struct for user transform */ 1319 png_byte user_transform_depth PNG_DEPSTRUCT; /* bit depth of user transformed pixels */ 1320 png_byte user_transform_channels PNG_DEPSTRUCT; /* channels in user transformed pixels */ 1321#endif 1322#endif 1323 1324 png_uint_32 mode PNG_DEPSTRUCT; /* tells us where we are in the PNG file */ 1325 png_uint_32 flags PNG_DEPSTRUCT; /* flags indicating various things to libpng */ 1326 png_uint_32 transformations PNG_DEPSTRUCT; /* which transformations to perform */ 1327 1328 z_stream zstream PNG_DEPSTRUCT; /* pointer to decompression structure (below) */ 1329 png_bytep zbuf PNG_DEPSTRUCT; /* buffer for zlib */ 1330 png_size_t zbuf_size PNG_DEPSTRUCT; /* size of zbuf */ 1331 int zlib_level PNG_DEPSTRUCT; /* holds zlib compression level */ 1332 int zlib_method PNG_DEPSTRUCT; /* holds zlib compression method */ 1333 int zlib_window_bits PNG_DEPSTRUCT; /* holds zlib compression window bits */ 1334 int zlib_mem_level PNG_DEPSTRUCT; /* holds zlib compression memory level */ 1335 int zlib_strategy PNG_DEPSTRUCT; /* holds zlib compression strategy */ 1336 1337 png_uint_32 width PNG_DEPSTRUCT; /* width of image in pixels */ 1338 png_uint_32 height PNG_DEPSTRUCT; /* height of image in pixels */ 1339 png_uint_32 num_rows PNG_DEPSTRUCT; /* number of rows in current pass */ 1340 png_uint_32 usr_width PNG_DEPSTRUCT; /* width of row at start of write */ 1341 png_uint_32 rowbytes PNG_DEPSTRUCT; /* size of row in bytes */ 1342#if 0 /* Replaced with the following in libpng-1.2.43 */ 1343 png_size_t irowbytes PNG_DEPSTRUCT; 1344#endif 1345/* Added in libpng-1.2.43 */ 1346#ifdef PNG_USER_LIMITS_SUPPORTED 1347 /* Added in libpng-1.4.0: Total number of sPLT, text, and unknown 1348 * chunks that can be stored (0 means unlimited). 1349 */ 1350 png_uint_32 user_chunk_cache_max PNG_DEPSTRUCT; 1351#endif 1352 png_uint_32 iwidth PNG_DEPSTRUCT; /* width of current interlaced row in pixels */ 1353 png_uint_32 row_number PNG_DEPSTRUCT; /* current row in interlace pass */ 1354 png_bytep prev_row PNG_DEPSTRUCT; /* buffer to save previous (unfiltered) row */ 1355 png_bytep row_buf PNG_DEPSTRUCT; /* buffer to save current (unfiltered) row */ 1356#ifndef PNG_NO_WRITE_FILTER 1357 png_bytep sub_row PNG_DEPSTRUCT; /* buffer to save "sub" row when filtering */ 1358 png_bytep up_row PNG_DEPSTRUCT; /* buffer to save "up" row when filtering */ 1359 png_bytep avg_row PNG_DEPSTRUCT; /* buffer to save "avg" row when filtering */ 1360 png_bytep paeth_row PNG_DEPSTRUCT; /* buffer to save "Paeth" row when filtering */ 1361#endif 1362 png_row_info row_info PNG_DEPSTRUCT; /* used for transformation routines */ 1363 1364 png_uint_32 idat_size PNG_DEPSTRUCT; /* current IDAT size for read */ 1365 png_uint_32 crc PNG_DEPSTRUCT; /* current chunk CRC value */ 1366 png_colorp palette PNG_DEPSTRUCT; /* palette from the input file */ 1367 png_uint_16 num_palette PNG_DEPSTRUCT; /* number of color entries in palette */ 1368 png_uint_16 num_trans PNG_DEPSTRUCT; /* number of transparency values */ 1369 png_byte chunk_name[5] PNG_DEPSTRUCT; /* null-terminated name of current chunk */ 1370 png_byte compression PNG_DEPSTRUCT; /* file compression type (always 0) */ 1371 png_byte filter PNG_DEPSTRUCT; /* file filter type (always 0) */ 1372 png_byte interlaced PNG_DEPSTRUCT; /* PNG_INTERLACE_NONE, PNG_INTERLACE_ADAM7 */ 1373 png_byte pass PNG_DEPSTRUCT; /* current interlace pass (0 - 6) */ 1374 png_byte do_filter PNG_DEPSTRUCT; /* row filter flags (see PNG_FILTER_ below ) */ 1375 png_byte color_type PNG_DEPSTRUCT; /* color type of file */ 1376 png_byte bit_depth PNG_DEPSTRUCT; /* bit depth of file */ 1377 png_byte usr_bit_depth PNG_DEPSTRUCT; /* bit depth of users row */ 1378 png_byte pixel_depth PNG_DEPSTRUCT; /* number of bits per pixel */ 1379 png_byte channels PNG_DEPSTRUCT; /* number of channels in file */ 1380 png_byte usr_channels PNG_DEPSTRUCT; /* channels at start of write */ 1381 png_byte sig_bytes PNG_DEPSTRUCT; /* magic bytes read/written from start of file */ 1382 1383#if defined(PNG_READ_FILLER_SUPPORTED) || defined(PNG_WRITE_FILLER_SUPPORTED) 1384#ifdef PNG_LEGACY_SUPPORTED 1385 png_byte filler PNG_DEPSTRUCT; /* filler byte for pixel expansion */ 1386#else 1387 png_uint_16 filler PNG_DEPSTRUCT; /* filler bytes for pixel expansion */ 1388#endif 1389#endif 1390 1391#ifdef PNG_bKGD_SUPPORTED 1392 png_byte background_gamma_type PNG_DEPSTRUCT; 1393# ifdef PNG_FLOATING_POINT_SUPPORTED 1394 float background_gamma PNG_DEPSTRUCT; 1395# endif 1396 png_color_16 background PNG_DEPSTRUCT; /* background color in screen gamma space */ 1397#ifdef PNG_READ_GAMMA_SUPPORTED 1398 png_color_16 background_1 PNG_DEPSTRUCT; /* background normalized to gamma 1.0 */ 1399#endif 1400#endif /* PNG_bKGD_SUPPORTED */ 1401 1402#ifdef PNG_WRITE_FLUSH_SUPPORTED 1403 png_flush_ptr output_flush_fn PNG_DEPSTRUCT; /* Function for flushing output */ 1404 png_uint_32 flush_dist PNG_DEPSTRUCT; /* how many rows apart to flush, 0 - no flush */ 1405 png_uint_32 flush_rows PNG_DEPSTRUCT; /* number of rows written since last flush */ 1406#endif 1407 1408#if defined(PNG_READ_GAMMA_SUPPORTED) || defined(PNG_READ_BACKGROUND_SUPPORTED) 1409 int gamma_shift PNG_DEPSTRUCT; /* number of "insignificant" bits 16-bit gamma */ 1410#ifdef PNG_FLOATING_POINT_SUPPORTED 1411 float gamma PNG_DEPSTRUCT; /* file gamma value */ 1412 float screen_gamma PNG_DEPSTRUCT; /* screen gamma value (display_exponent) */ 1413#endif 1414#endif 1415 1416#if defined(PNG_READ_GAMMA_SUPPORTED) || defined(PNG_READ_BACKGROUND_SUPPORTED) 1417 png_bytep gamma_table PNG_DEPSTRUCT; /* gamma table for 8-bit depth files */ 1418 png_bytep gamma_from_1 PNG_DEPSTRUCT; /* converts from 1.0 to screen */ 1419 png_bytep gamma_to_1 PNG_DEPSTRUCT; /* converts from file to 1.0 */ 1420 png_uint_16pp gamma_16_table PNG_DEPSTRUCT; /* gamma table for 16-bit depth files */ 1421 png_uint_16pp gamma_16_from_1 PNG_DEPSTRUCT; /* converts from 1.0 to screen */ 1422 png_uint_16pp gamma_16_to_1 PNG_DEPSTRUCT; /* converts from file to 1.0 */ 1423#endif 1424 1425#if defined(PNG_READ_GAMMA_SUPPORTED) || defined(PNG_sBIT_SUPPORTED) 1426 png_color_8 sig_bit PNG_DEPSTRUCT; /* significant bits in each available channel */ 1427#endif 1428 1429#if defined(PNG_READ_SHIFT_SUPPORTED) || defined(PNG_WRITE_SHIFT_SUPPORTED) 1430 png_color_8 shift PNG_DEPSTRUCT; /* shift for significant bit tranformation */ 1431#endif 1432 1433#if defined(PNG_tRNS_SUPPORTED) || defined(PNG_READ_BACKGROUND_SUPPORTED) \ 1434 || defined(PNG_READ_EXPAND_SUPPORTED) || defined(PNG_READ_BACKGROUND_SUPPORTED) 1435 png_bytep trans PNG_DEPSTRUCT; /* transparency values for paletted files */ 1436 png_color_16 trans_values PNG_DEPSTRUCT; /* transparency values for non-paletted files */ 1437#endif 1438 1439 png_read_status_ptr read_row_fn PNG_DEPSTRUCT; /* called after each row is decoded */ 1440 png_write_status_ptr write_row_fn PNG_DEPSTRUCT; /* called after each row is encoded */ 1441#ifdef PNG_PROGRESSIVE_READ_SUPPORTED 1442 png_progressive_info_ptr info_fn PNG_DEPSTRUCT; /* called after header data fully read */ 1443 png_progressive_row_ptr row_fn PNG_DEPSTRUCT; /* called after each prog. row is decoded */ 1444 png_progressive_end_ptr end_fn PNG_DEPSTRUCT; /* called after image is complete */ 1445 png_bytep save_buffer_ptr PNG_DEPSTRUCT; /* current location in save_buffer */ 1446 png_bytep save_buffer PNG_DEPSTRUCT; /* buffer for previously read data */ 1447 png_bytep current_buffer_ptr PNG_DEPSTRUCT; /* current location in current_buffer */ 1448 png_bytep current_buffer PNG_DEPSTRUCT; /* buffer for recently used data */ 1449 png_uint_32 push_length PNG_DEPSTRUCT; /* size of current input chunk */ 1450 png_uint_32 skip_length PNG_DEPSTRUCT; /* bytes to skip in input data */ 1451 png_size_t save_buffer_size PNG_DEPSTRUCT; /* amount of data now in save_buffer */ 1452 png_size_t save_buffer_max PNG_DEPSTRUCT; /* total size of save_buffer */ 1453 png_size_t buffer_size PNG_DEPSTRUCT; /* total amount of available input data */ 1454 png_size_t current_buffer_size PNG_DEPSTRUCT; /* amount of data now in current_buffer */ 1455 int process_mode PNG_DEPSTRUCT; /* what push library is currently doing */ 1456 int cur_palette PNG_DEPSTRUCT; /* current push library palette index */ 1457 1458# ifdef PNG_TEXT_SUPPORTED 1459 png_size_t current_text_size PNG_DEPSTRUCT; /* current size of text input data */ 1460 png_size_t current_text_left PNG_DEPSTRUCT; /* how much text left to read in input */ 1461 png_charp current_text PNG_DEPSTRUCT; /* current text chunk buffer */ 1462 png_charp current_text_ptr PNG_DEPSTRUCT; /* current location in current_text */ 1463# endif /* PNG_TEXT_SUPPORTED */ 1464#endif /* PNG_PROGRESSIVE_READ_SUPPORTED */ 1465 1466#if defined(__TURBOC__) && !defined(_Windows) && !defined(__FLAT__) 1467/* for the Borland special 64K segment handler */ 1468 png_bytepp offset_table_ptr PNG_DEPSTRUCT; 1469 png_bytep offset_table PNG_DEPSTRUCT; 1470 png_uint_16 offset_table_number PNG_DEPSTRUCT; 1471 png_uint_16 offset_table_count PNG_DEPSTRUCT; 1472 png_uint_16 offset_table_count_free PNG_DEPSTRUCT; 1473#endif 1474 1475#ifdef PNG_READ_DITHER_SUPPORTED 1476 png_bytep palette_lookup PNG_DEPSTRUCT; /* lookup table for dithering */ 1477 png_bytep dither_index PNG_DEPSTRUCT; /* index translation for palette files */ 1478#endif 1479 1480#if defined(PNG_READ_DITHER_SUPPORTED) || defined(PNG_hIST_SUPPORTED) 1481 png_uint_16p hist PNG_DEPSTRUCT; /* histogram */ 1482#endif 1483 1484#ifdef PNG_WRITE_WEIGHTED_FILTER_SUPPORTED 1485 png_byte heuristic_method PNG_DEPSTRUCT; /* heuristic for row filter selection */ 1486 png_byte num_prev_filters PNG_DEPSTRUCT; /* number of weights for previous rows */ 1487 png_bytep prev_filters PNG_DEPSTRUCT; /* filter type(s) of previous row(s) */ 1488 png_uint_16p filter_weights PNG_DEPSTRUCT; /* weight(s) for previous line(s) */ 1489 png_uint_16p inv_filter_weights PNG_DEPSTRUCT; /* 1/weight(s) for previous line(s) */ 1490 png_uint_16p filter_costs PNG_DEPSTRUCT; /* relative filter calculation cost */ 1491 png_uint_16p inv_filter_costs PNG_DEPSTRUCT; /* 1/relative filter calculation cost */ 1492#endif 1493 1494#ifdef PNG_TIME_RFC1123_SUPPORTED 1495 png_charp time_buffer PNG_DEPSTRUCT; /* String to hold RFC 1123 time text */ 1496#endif 1497 1498/* New members added in libpng-1.0.6 */ 1499 1500#ifdef PNG_FREE_ME_SUPPORTED 1501 png_uint_32 free_me PNG_DEPSTRUCT; /* flags items libpng is responsible for freeing */ 1502#endif 1503 1504#ifdef PNG_USER_CHUNKS_SUPPORTED 1505 png_voidp user_chunk_ptr PNG_DEPSTRUCT; 1506 png_user_chunk_ptr read_user_chunk_fn PNG_DEPSTRUCT; /* user read chunk handler */ 1507#endif 1508 1509#ifdef PNG_HANDLE_AS_UNKNOWN_SUPPORTED 1510 int num_chunk_list PNG_DEPSTRUCT; 1511 png_bytep chunk_list PNG_DEPSTRUCT; 1512#endif 1513 1514/* New members added in libpng-1.0.3 */ 1515#ifdef PNG_READ_RGB_TO_GRAY_SUPPORTED 1516 png_byte rgb_to_gray_status PNG_DEPSTRUCT; 1517 /* These were changed from png_byte in libpng-1.0.6 */ 1518 png_uint_16 rgb_to_gray_red_coeff PNG_DEPSTRUCT; 1519 png_uint_16 rgb_to_gray_green_coeff PNG_DEPSTRUCT; 1520 png_uint_16 rgb_to_gray_blue_coeff PNG_DEPSTRUCT; 1521#endif 1522 1523/* New member added in libpng-1.0.4 (renamed in 1.0.9) */ 1524#if defined(PNG_MNG_FEATURES_SUPPORTED) || \ 1525 defined(PNG_READ_EMPTY_PLTE_SUPPORTED) || \ 1526 defined(PNG_WRITE_EMPTY_PLTE_SUPPORTED) 1527/* Changed from png_byte to png_uint_32 at version 1.2.0 */ 1528#ifdef PNG_1_0_X 1529 png_byte mng_features_permitted PNG_DEPSTRUCT; 1530#else 1531 png_uint_32 mng_features_permitted PNG_DEPSTRUCT; 1532#endif /* PNG_1_0_X */ 1533#endif 1534 1535/* New member added in libpng-1.0.7 */ 1536#if defined(PNG_READ_GAMMA_SUPPORTED) || defined(PNG_READ_BACKGROUND_SUPPORTED) 1537 png_fixed_point int_gamma PNG_DEPSTRUCT; 1538#endif 1539 1540/* New member added in libpng-1.0.9, ifdef'ed out in 1.0.12, enabled in 1.2.0 */ 1541#ifdef PNG_MNG_FEATURES_SUPPORTED 1542 png_byte filter_type PNG_DEPSTRUCT; 1543#endif 1544 1545#ifdef PNG_1_0_X 1546/* New member added in libpng-1.0.10, ifdef'ed out in 1.2.0 */ 1547 png_uint_32 row_buf_size PNG_DEPSTRUCT; 1548#endif 1549 1550/* New members added in libpng-1.2.0 */ 1551#ifdef PNG_ASSEMBLER_CODE_SUPPORTED 1552# ifndef PNG_1_0_X 1553# ifdef PNG_MMX_CODE_SUPPORTED 1554 png_byte mmx_bitdepth_threshold PNG_DEPSTRUCT; 1555 png_uint_32 mmx_rowbytes_threshold PNG_DEPSTRUCT; 1556# endif 1557 png_uint_32 asm_flags PNG_DEPSTRUCT; 1558# endif 1559#endif 1560 1561/* New members added in libpng-1.0.2 but first enabled by default in 1.2.0 */ 1562#ifdef PNG_USER_MEM_SUPPORTED 1563 png_voidp mem_ptr PNG_DEPSTRUCT; /* user supplied struct for mem functions */ 1564 png_malloc_ptr malloc_fn PNG_DEPSTRUCT; /* function for allocating memory */ 1565 png_free_ptr free_fn PNG_DEPSTRUCT; /* function for freeing memory */ 1566#endif 1567 1568/* New member added in libpng-1.0.13 and 1.2.0 */ 1569 png_bytep big_row_buf PNG_DEPSTRUCT; /* buffer to save current (unfiltered) row */ 1570 1571#ifdef PNG_READ_DITHER_SUPPORTED 1572/* The following three members were added at version 1.0.14 and 1.2.4 */ 1573 png_bytep dither_sort PNG_DEPSTRUCT; /* working sort array */ 1574 png_bytep index_to_palette PNG_DEPSTRUCT; /* where the original index currently is */ 1575 /* in the palette */ 1576 png_bytep palette_to_index PNG_DEPSTRUCT; /* which original index points to this */ 1577 /* palette color */ 1578#endif 1579 1580/* New members added in libpng-1.0.16 and 1.2.6 */ 1581 png_byte compression_type PNG_DEPSTRUCT; 1582 1583#ifdef PNG_USER_LIMITS_SUPPORTED 1584 png_uint_32 user_width_max PNG_DEPSTRUCT; 1585 png_uint_32 user_height_max PNG_DEPSTRUCT; 1586#endif 1587 1588/* New member added in libpng-1.0.25 and 1.2.17 */ 1589#ifdef PNG_UNKNOWN_CHUNKS_SUPPORTED 1590 /* Storage for unknown chunk that the library doesn't recognize. */ 1591 png_unknown_chunk unknown_chunk PNG_DEPSTRUCT; 1592#endif 1593 1594#ifdef PNG_INDEX_SUPPORTED 1595 png_indexp index PNG_DEPSTRUCT; 1596 png_uint_32 total_data_read; 1597#endif 1598 1599/* New members added in libpng-1.2.26 */ 1600 png_uint_32 old_big_row_buf_size PNG_DEPSTRUCT; 1601 png_uint_32 old_prev_row_size PNG_DEPSTRUCT; 1602 1603/* New member added in libpng-1.2.30 */ 1604 png_charp chunkdata PNG_DEPSTRUCT; /* buffer for reading chunk data */ 1605}; 1606 1607 1608/* This triggers a compiler error in png.c, if png.c and png.h 1609 * do not agree upon the version number. 1610 */ 1611typedef png_structp version_1_2_46; 1612 1613typedef png_struct FAR * FAR * png_structpp; 1614 1615/* Here are the function definitions most commonly used. This is not 1616 * the place to find out how to use libpng. See libpng.txt for the 1617 * full explanation, see example.c for the summary. This just provides 1618 * a simple one line description of the use of each function. 1619 */ 1620 1621/* Returns the version number of the library */ 1622extern PNG_EXPORT(png_uint_32,png_access_version_number) PNGARG((void)); 1623 1624/* Tell lib we have already handled the first <num_bytes> magic bytes. 1625 * Handling more than 8 bytes from the beginning of the file is an error. 1626 */ 1627extern PNG_EXPORT(void,png_set_sig_bytes) PNGARG((png_structp png_ptr, 1628 int num_bytes)); 1629 1630/* Check sig[start] through sig[start + num_to_check - 1] to see if it's a 1631 * PNG file. Returns zero if the supplied bytes match the 8-byte PNG 1632 * signature, and non-zero otherwise. Having num_to_check == 0 or 1633 * start > 7 will always fail (ie return non-zero). 1634 */ 1635extern PNG_EXPORT(int,png_sig_cmp) PNGARG((png_bytep sig, png_size_t start, 1636 png_size_t num_to_check)); 1637 1638/* Simple signature checking function. This is the same as calling 1639 * png_check_sig(sig, n) := !png_sig_cmp(sig, 0, n). 1640 */ 1641extern PNG_EXPORT(int,png_check_sig) PNGARG((png_bytep sig, int num)) PNG_DEPRECATED; 1642 1643/* Allocate and initialize png_ptr struct for reading, and any other memory. */ 1644extern PNG_EXPORT(png_structp,png_create_read_struct) 1645 PNGARG((png_const_charp user_png_ver, png_voidp error_ptr, 1646 png_error_ptr error_fn, png_error_ptr warn_fn)) PNG_ALLOCATED; 1647 1648/* Allocate and initialize png_ptr struct for writing, and any other memory */ 1649extern PNG_EXPORT(png_structp,png_create_write_struct) 1650 PNGARG((png_const_charp user_png_ver, png_voidp error_ptr, 1651 png_error_ptr error_fn, png_error_ptr warn_fn)) PNG_ALLOCATED; 1652 1653#ifdef PNG_WRITE_SUPPORTED 1654extern PNG_EXPORT(png_uint_32,png_get_compression_buffer_size) 1655 PNGARG((png_structp png_ptr)); 1656#endif 1657 1658#ifdef PNG_WRITE_SUPPORTED 1659extern PNG_EXPORT(void,png_set_compression_buffer_size) 1660 PNGARG((png_structp png_ptr, png_uint_32 size)); 1661#endif 1662 1663/* Reset the compression stream */ 1664extern PNG_EXPORT(int,png_reset_zstream) PNGARG((png_structp png_ptr)); 1665 1666/* New functions added in libpng-1.0.2 (not enabled by default until 1.2.0) */ 1667#ifdef PNG_USER_MEM_SUPPORTED 1668extern PNG_EXPORT(png_structp,png_create_read_struct_2) 1669 PNGARG((png_const_charp user_png_ver, png_voidp error_ptr, 1670 png_error_ptr error_fn, png_error_ptr warn_fn, png_voidp mem_ptr, 1671 png_malloc_ptr malloc_fn, png_free_ptr free_fn)) PNG_ALLOCATED; 1672extern PNG_EXPORT(png_structp,png_create_write_struct_2) 1673 PNGARG((png_const_charp user_png_ver, png_voidp error_ptr, 1674 png_error_ptr error_fn, png_error_ptr warn_fn, png_voidp mem_ptr, 1675 png_malloc_ptr malloc_fn, png_free_ptr free_fn)) PNG_ALLOCATED; 1676#endif 1677 1678/* Write a PNG chunk - size, type, (optional) data, CRC. */ 1679extern PNG_EXPORT(void,png_write_chunk) PNGARG((png_structp png_ptr, 1680 png_bytep chunk_name, png_bytep data, png_size_t length)); 1681 1682/* Write the start of a PNG chunk - length and chunk name. */ 1683extern PNG_EXPORT(void,png_write_chunk_start) PNGARG((png_structp png_ptr, 1684 png_bytep chunk_name, png_uint_32 length)); 1685 1686/* Write the data of a PNG chunk started with png_write_chunk_start(). */ 1687extern PNG_EXPORT(void,png_write_chunk_data) PNGARG((png_structp png_ptr, 1688 png_bytep data, png_size_t length)); 1689 1690/* Finish a chunk started with png_write_chunk_start() (includes CRC). */ 1691extern PNG_EXPORT(void,png_write_chunk_end) PNGARG((png_structp png_ptr)); 1692 1693/* Allocate and initialize the info structure */ 1694extern PNG_EXPORT(png_infop,png_create_info_struct) 1695 PNGARG((png_structp png_ptr)) PNG_ALLOCATED; 1696 1697#if defined(PNG_1_0_X) || defined (PNG_1_2_X) 1698/* Initialize the info structure (old interface - DEPRECATED) */ 1699extern PNG_EXPORT(void,png_info_init) PNGARG((png_infop info_ptr)) 1700 PNG_DEPRECATED; 1701#undef png_info_init 1702#define png_info_init(info_ptr) png_info_init_3(&info_ptr,\ 1703 png_sizeof(png_info)); 1704#endif 1705 1706extern PNG_EXPORT(void,png_info_init_3) PNGARG((png_infopp info_ptr, 1707 png_size_t png_info_struct_size)); 1708 1709/* Writes all the PNG information before the image. */ 1710extern PNG_EXPORT(void,png_write_info_before_PLTE) PNGARG((png_structp png_ptr, 1711 png_infop info_ptr)); 1712extern PNG_EXPORT(void,png_write_info) PNGARG((png_structp png_ptr, 1713 png_infop info_ptr)); 1714 1715#ifdef PNG_SEQUENTIAL_READ_SUPPORTED 1716/* Read the information before the actual image data. */ 1717extern PNG_EXPORT(void,png_read_info) PNGARG((png_structp png_ptr, 1718 png_infop info_ptr)); 1719#endif 1720 1721#ifdef PNG_TIME_RFC1123_SUPPORTED 1722extern PNG_EXPORT(png_charp,png_convert_to_rfc1123) 1723 PNGARG((png_structp png_ptr, png_timep ptime)); 1724#endif 1725 1726#ifdef PNG_CONVERT_tIME_SUPPORTED 1727/* Convert from a struct tm to png_time */ 1728extern PNG_EXPORT(void,png_convert_from_struct_tm) PNGARG((png_timep ptime, 1729 struct tm FAR * ttime)); 1730 1731/* Convert from time_t to png_time. Uses gmtime() */ 1732extern PNG_EXPORT(void,png_convert_from_time_t) PNGARG((png_timep ptime, 1733 time_t ttime)); 1734#endif /* PNG_CONVERT_tIME_SUPPORTED */ 1735 1736#ifdef PNG_READ_EXPAND_SUPPORTED 1737/* Expand data to 24-bit RGB, or 8-bit grayscale, with alpha if available. */ 1738extern PNG_EXPORT(void,png_set_expand) PNGARG((png_structp png_ptr)); 1739#ifndef PNG_1_0_X 1740extern PNG_EXPORT(void,png_set_expand_gray_1_2_4_to_8) PNGARG((png_structp 1741 png_ptr)); 1742#endif 1743extern PNG_EXPORT(void,png_set_palette_to_rgb) PNGARG((png_structp png_ptr)); 1744extern PNG_EXPORT(void,png_set_tRNS_to_alpha) PNGARG((png_structp png_ptr)); 1745#if defined(PNG_1_0_X) || defined (PNG_1_2_X) 1746/* Deprecated */ 1747extern PNG_EXPORT(void,png_set_gray_1_2_4_to_8) PNGARG((png_structp 1748 png_ptr)) PNG_DEPRECATED; 1749#endif 1750#endif 1751 1752#if defined(PNG_READ_BGR_SUPPORTED) || defined(PNG_WRITE_BGR_SUPPORTED) 1753/* Use blue, green, red order for pixels. */ 1754extern PNG_EXPORT(void,png_set_bgr) PNGARG((png_structp png_ptr)); 1755#endif 1756 1757#ifdef PNG_READ_GRAY_TO_RGB_SUPPORTED 1758/* Expand the grayscale to 24-bit RGB if necessary. */ 1759extern PNG_EXPORT(void,png_set_gray_to_rgb) PNGARG((png_structp png_ptr)); 1760#endif 1761 1762#ifdef PNG_READ_RGB_TO_GRAY_SUPPORTED 1763/* Reduce RGB to grayscale. */ 1764#ifdef PNG_FLOATING_POINT_SUPPORTED 1765extern PNG_EXPORT(void,png_set_rgb_to_gray) PNGARG((png_structp png_ptr, 1766 int error_action, double red, double green )); 1767#endif 1768extern PNG_EXPORT(void,png_set_rgb_to_gray_fixed) PNGARG((png_structp png_ptr, 1769 int error_action, png_fixed_point red, png_fixed_point green )); 1770extern PNG_EXPORT(png_byte,png_get_rgb_to_gray_status) PNGARG((png_structp 1771 png_ptr)); 1772#endif 1773 1774extern PNG_EXPORT(void,png_build_grayscale_palette) PNGARG((int bit_depth, 1775 png_colorp palette)); 1776 1777#ifdef PNG_READ_STRIP_ALPHA_SUPPORTED 1778extern PNG_EXPORT(void,png_set_strip_alpha) PNGARG((png_structp png_ptr)); 1779#endif 1780 1781#if defined(PNG_READ_SWAP_ALPHA_SUPPORTED) || \ 1782 defined(PNG_WRITE_SWAP_ALPHA_SUPPORTED) 1783extern PNG_EXPORT(void,png_set_swap_alpha) PNGARG((png_structp png_ptr)); 1784#endif 1785 1786#if defined(PNG_READ_INVERT_ALPHA_SUPPORTED) || \ 1787 defined(PNG_WRITE_INVERT_ALPHA_SUPPORTED) 1788extern PNG_EXPORT(void,png_set_invert_alpha) PNGARG((png_structp png_ptr)); 1789#endif 1790 1791#if defined(PNG_READ_FILLER_SUPPORTED) || defined(PNG_WRITE_FILLER_SUPPORTED) 1792/* Add a filler byte to 8-bit Gray or 24-bit RGB images. */ 1793extern PNG_EXPORT(void,png_set_filler) PNGARG((png_structp png_ptr, 1794 png_uint_32 filler, int flags)); 1795/* The values of the PNG_FILLER_ defines should NOT be changed */ 1796#define PNG_FILLER_BEFORE 0 1797#define PNG_FILLER_AFTER 1 1798/* Add an alpha byte to 8-bit Gray or 24-bit RGB images. */ 1799#ifndef PNG_1_0_X 1800extern PNG_EXPORT(void,png_set_add_alpha) PNGARG((png_structp png_ptr, 1801 png_uint_32 filler, int flags)); 1802#endif 1803#endif /* PNG_READ_FILLER_SUPPORTED || PNG_WRITE_FILLER_SUPPORTED */ 1804 1805#if defined(PNG_READ_SWAP_SUPPORTED) || defined(PNG_WRITE_SWAP_SUPPORTED) 1806/* Swap bytes in 16-bit depth files. */ 1807extern PNG_EXPORT(void,png_set_swap) PNGARG((png_structp png_ptr)); 1808#endif 1809 1810#if defined(PNG_READ_PACK_SUPPORTED) || defined(PNG_WRITE_PACK_SUPPORTED) 1811/* Use 1 byte per pixel in 1, 2, or 4-bit depth files. */ 1812extern PNG_EXPORT(void,png_set_packing) PNGARG((png_structp png_ptr)); 1813#endif 1814 1815#if defined(PNG_READ_PACKSWAP_SUPPORTED) || defined(PNG_WRITE_PACKSWAP_SUPPORTED) 1816/* Swap packing order of pixels in bytes. */ 1817extern PNG_EXPORT(void,png_set_packswap) PNGARG((png_structp png_ptr)); 1818#endif 1819 1820#if defined(PNG_READ_SHIFT_SUPPORTED) || defined(PNG_WRITE_SHIFT_SUPPORTED) 1821/* Converts files to legal bit depths. */ 1822extern PNG_EXPORT(void,png_set_shift) PNGARG((png_structp png_ptr, 1823 png_color_8p true_bits)); 1824#endif 1825 1826#if defined(PNG_READ_INTERLACING_SUPPORTED) || \ 1827 defined(PNG_WRITE_INTERLACING_SUPPORTED) 1828/* Have the code handle the interlacing. Returns the number of passes. */ 1829extern PNG_EXPORT(int,png_set_interlace_handling) PNGARG((png_structp png_ptr)); 1830#endif 1831 1832#if defined(PNG_READ_INVERT_SUPPORTED) || defined(PNG_WRITE_INVERT_SUPPORTED) 1833/* Invert monochrome files */ 1834extern PNG_EXPORT(void,png_set_invert_mono) PNGARG((png_structp png_ptr)); 1835#endif 1836 1837#ifdef PNG_READ_BACKGROUND_SUPPORTED 1838/* Handle alpha and tRNS by replacing with a background color. */ 1839#ifdef PNG_FLOATING_POINT_SUPPORTED 1840extern PNG_EXPORT(void,png_set_background) PNGARG((png_structp png_ptr, 1841 png_color_16p background_color, int background_gamma_code, 1842 int need_expand, double background_gamma)); 1843#endif 1844#define PNG_BACKGROUND_GAMMA_UNKNOWN 0 1845#define PNG_BACKGROUND_GAMMA_SCREEN 1 1846#define PNG_BACKGROUND_GAMMA_FILE 2 1847#define PNG_BACKGROUND_GAMMA_UNIQUE 3 1848#endif 1849 1850#ifdef PNG_READ_16_TO_8_SUPPORTED 1851/* Strip the second byte of information from a 16-bit depth file. */ 1852extern PNG_EXPORT(void,png_set_strip_16) PNGARG((png_structp png_ptr)); 1853#endif 1854 1855#ifdef PNG_READ_DITHER_SUPPORTED 1856/* Turn on dithering, and reduce the palette to the number of colors available. */ 1857extern PNG_EXPORT(void,png_set_dither) PNGARG((png_structp png_ptr, 1858 png_colorp palette, int num_palette, int maximum_colors, 1859 png_uint_16p histogram, int full_dither)); 1860#endif 1861 1862#ifdef PNG_READ_GAMMA_SUPPORTED 1863/* Handle gamma correction. Screen_gamma=(display_exponent) */ 1864#ifdef PNG_FLOATING_POINT_SUPPORTED 1865extern PNG_EXPORT(void,png_set_gamma) PNGARG((png_structp png_ptr, 1866 double screen_gamma, double default_file_gamma)); 1867#endif 1868#endif 1869 1870#if defined(PNG_1_0_X) || defined (PNG_1_2_X) 1871#if defined(PNG_READ_EMPTY_PLTE_SUPPORTED) || \ 1872 defined(PNG_WRITE_EMPTY_PLTE_SUPPORTED) 1873/* Permit or disallow empty PLTE (0: not permitted, 1: permitted) */ 1874/* Deprecated and will be removed. Use png_permit_mng_features() instead. */ 1875extern PNG_EXPORT(void,png_permit_empty_plte) PNGARG((png_structp png_ptr, 1876 int empty_plte_permitted)) PNG_DEPRECATED; 1877#endif 1878#endif 1879 1880#ifdef PNG_WRITE_FLUSH_SUPPORTED 1881/* Set how many lines between output flushes - 0 for no flushing */ 1882extern PNG_EXPORT(void,png_set_flush) PNGARG((png_structp png_ptr, int nrows)); 1883/* Flush the current PNG output buffer */ 1884extern PNG_EXPORT(void,png_write_flush) PNGARG((png_structp png_ptr)); 1885#endif 1886 1887/* Optional update palette with requested transformations */ 1888extern PNG_EXPORT(void,png_start_read_image) PNGARG((png_structp png_ptr)); 1889 1890/* Optional call to update the users info structure */ 1891extern PNG_EXPORT(void,png_read_update_info) PNGARG((png_structp png_ptr, 1892 png_infop info_ptr)); 1893 1894#ifndef PNG_NO_SEQUENTIAL_READ_SUPPORTED 1895/* Read one or more rows of image data. */ 1896extern PNG_EXPORT(void,png_read_rows) PNGARG((png_structp png_ptr, 1897 png_bytepp row, png_bytepp display_row, png_uint_32 num_rows)); 1898#endif 1899 1900#ifndef PNG_NO_SEQUENTIAL_READ_SUPPORTED 1901/* Read a row of data. */ 1902extern PNG_EXPORT(void,png_read_row) PNGARG((png_structp png_ptr, 1903 png_bytep row, 1904 png_bytep display_row)); 1905#endif 1906 1907#ifdef PNG_INDEX_SUPPORTED 1908/* Build image index for partial image decoding. */ 1909extern PNG_EXPORT(void,png_build_index) PNGARG((png_structp png_ptr)); 1910extern PNG_EXPORT(void,png_configure_decoder) 1911 PNGARG((png_structp png_ptr, int *row_offset, int pass)); 1912#endif 1913 1914 1915#ifndef PNG_NO_SEQUENTIAL_READ_SUPPORTED 1916/* Read the whole image into memory at once. */ 1917extern PNG_EXPORT(void,png_read_image) PNGARG((png_structp png_ptr, 1918 png_bytepp image)); 1919#endif 1920 1921/* Write a row of image data */ 1922extern PNG_EXPORT(void,png_write_row) PNGARG((png_structp png_ptr, 1923 png_bytep row)); 1924 1925/* Write a few rows of image data */ 1926extern PNG_EXPORT(void,png_write_rows) PNGARG((png_structp png_ptr, 1927 png_bytepp row, png_uint_32 num_rows)); 1928 1929/* Write the image data */ 1930extern PNG_EXPORT(void,png_write_image) PNGARG((png_structp png_ptr, 1931 png_bytepp image)); 1932 1933/* Writes the end of the PNG file. */ 1934extern PNG_EXPORT(void,png_write_end) PNGARG((png_structp png_ptr, 1935 png_infop info_ptr)); 1936 1937#ifndef PNG_NO_SEQUENTIAL_READ_SUPPORTED 1938/* Read the end of the PNG file. */ 1939extern PNG_EXPORT(void,png_read_end) PNGARG((png_structp png_ptr, 1940 png_infop info_ptr)); 1941#endif 1942 1943/* Free any memory associated with the png_info_struct */ 1944extern PNG_EXPORT(void,png_destroy_info_struct) PNGARG((png_structp png_ptr, 1945 png_infopp info_ptr_ptr)); 1946 1947/* Free any memory associated with the png_struct and the png_info_structs */ 1948extern PNG_EXPORT(void,png_destroy_read_struct) PNGARG((png_structpp 1949 png_ptr_ptr, png_infopp info_ptr_ptr, png_infopp end_info_ptr_ptr)); 1950 1951/* Free all memory used by the read (old method - NOT DLL EXPORTED) */ 1952extern void png_read_destroy PNGARG((png_structp png_ptr, png_infop info_ptr, 1953 png_infop end_info_ptr)) PNG_DEPRECATED; 1954 1955/* Free any memory associated with the png_struct and the png_info_structs */ 1956extern PNG_EXPORT(void,png_destroy_write_struct) 1957 PNGARG((png_structpp png_ptr_ptr, png_infopp info_ptr_ptr)); 1958 1959/* Free any memory used in png_ptr struct (old method - NOT DLL EXPORTED) */ 1960extern void png_write_destroy PNGARG((png_structp png_ptr)) PNG_DEPRECATED; 1961 1962/* Set the libpng method of handling chunk CRC errors */ 1963extern PNG_EXPORT(void,png_set_crc_action) PNGARG((png_structp png_ptr, 1964 int crit_action, int ancil_action)); 1965 1966/* Values for png_set_crc_action() to say how to handle CRC errors in 1967 * ancillary and critical chunks, and whether to use the data contained 1968 * therein. Note that it is impossible to "discard" data in a critical 1969 * chunk. For versions prior to 0.90, the action was always error/quit, 1970 * whereas in version 0.90 and later, the action for CRC errors in ancillary 1971 * chunks is warn/discard. These values should NOT be changed. 1972 * 1973 * value action:critical action:ancillary 1974 */ 1975#define PNG_CRC_DEFAULT 0 /* error/quit warn/discard data */ 1976#define PNG_CRC_ERROR_QUIT 1 /* error/quit error/quit */ 1977#define PNG_CRC_WARN_DISCARD 2 /* (INVALID) warn/discard data */ 1978#define PNG_CRC_WARN_USE 3 /* warn/use data warn/use data */ 1979#define PNG_CRC_QUIET_USE 4 /* quiet/use data quiet/use data */ 1980#define PNG_CRC_NO_CHANGE 5 /* use current value use current value */ 1981 1982/* These functions give the user control over the scan-line filtering in 1983 * libpng and the compression methods used by zlib. These functions are 1984 * mainly useful for testing, as the defaults should work with most users. 1985 * Those users who are tight on memory or want faster performance at the 1986 * expense of compression can modify them. See the compression library 1987 * header file (zlib.h) for an explination of the compression functions. 1988 */ 1989 1990/* Set the filtering method(s) used by libpng. Currently, the only valid 1991 * value for "method" is 0. 1992 */ 1993extern PNG_EXPORT(void,png_set_filter) PNGARG((png_structp png_ptr, int method, 1994 int filters)); 1995 1996/* Flags for png_set_filter() to say which filters to use. The flags 1997 * are chosen so that they don't conflict with real filter types 1998 * below, in case they are supplied instead of the #defined constants. 1999 * These values should NOT be changed. 2000 */ 2001#define PNG_NO_FILTERS 0x00 2002#define PNG_FILTER_NONE 0x08 2003#define PNG_FILTER_SUB 0x10 2004#define PNG_FILTER_UP 0x20 2005#define PNG_FILTER_AVG 0x40 2006#define PNG_FILTER_PAETH 0x80 2007#define PNG_ALL_FILTERS (PNG_FILTER_NONE | PNG_FILTER_SUB | PNG_FILTER_UP | \ 2008 PNG_FILTER_AVG | PNG_FILTER_PAETH) 2009 2010/* Filter values (not flags) - used in pngwrite.c, pngwutil.c for now. 2011 * These defines should NOT be changed. 2012 */ 2013#define PNG_FILTER_VALUE_NONE 0 2014#define PNG_FILTER_VALUE_SUB 1 2015#define PNG_FILTER_VALUE_UP 2 2016#define PNG_FILTER_VALUE_AVG 3 2017#define PNG_FILTER_VALUE_PAETH 4 2018#define PNG_FILTER_VALUE_LAST 5 2019 2020#if defined(PNG_WRITE_WEIGHTED_FILTER_SUPPORTED) /* EXPERIMENTAL */ 2021/* The "heuristic_method" is given by one of the PNG_FILTER_HEURISTIC_ 2022 * defines, either the default (minimum-sum-of-absolute-differences), or 2023 * the experimental method (weighted-minimum-sum-of-absolute-differences). 2024 * 2025 * Weights are factors >= 1.0, indicating how important it is to keep the 2026 * filter type consistent between rows. Larger numbers mean the current 2027 * filter is that many times as likely to be the same as the "num_weights" 2028 * previous filters. This is cumulative for each previous row with a weight. 2029 * There needs to be "num_weights" values in "filter_weights", or it can be 2030 * NULL if the weights aren't being specified. Weights have no influence on 2031 * the selection of the first row filter. Well chosen weights can (in theory) 2032 * improve the compression for a given image. 2033 * 2034 * Costs are factors >= 1.0 indicating the relative decoding costs of a 2035 * filter type. Higher costs indicate more decoding expense, and are 2036 * therefore less likely to be selected over a filter with lower computational 2037 * costs. There needs to be a value in "filter_costs" for each valid filter 2038 * type (given by PNG_FILTER_VALUE_LAST), or it can be NULL if you aren't 2039 * setting the costs. Costs try to improve the speed of decompression without 2040 * unduly increasing the compressed image size. 2041 * 2042 * A negative weight or cost indicates the default value is to be used, and 2043 * values in the range [0.0, 1.0) indicate the value is to remain unchanged. 2044 * The default values for both weights and costs are currently 1.0, but may 2045 * change if good general weighting/cost heuristics can be found. If both 2046 * the weights and costs are set to 1.0, this degenerates the WEIGHTED method 2047 * to the UNWEIGHTED method, but with added encoding time/computation. 2048 */ 2049#ifdef PNG_FLOATING_POINT_SUPPORTED 2050extern PNG_EXPORT(void,png_set_filter_heuristics) PNGARG((png_structp png_ptr, 2051 int heuristic_method, int num_weights, png_doublep filter_weights, 2052 png_doublep filter_costs)); 2053#endif 2054#endif /* PNG_WRITE_WEIGHTED_FILTER_SUPPORTED */ 2055 2056/* Heuristic used for row filter selection. These defines should NOT be 2057 * changed. 2058 */ 2059#define PNG_FILTER_HEURISTIC_DEFAULT 0 /* Currently "UNWEIGHTED" */ 2060#define PNG_FILTER_HEURISTIC_UNWEIGHTED 1 /* Used by libpng < 0.95 */ 2061#define PNG_FILTER_HEURISTIC_WEIGHTED 2 /* Experimental feature */ 2062#define PNG_FILTER_HEURISTIC_LAST 3 /* Not a valid value */ 2063 2064/* Set the library compression level. Currently, valid values range from 2065 * 0 - 9, corresponding directly to the zlib compression levels 0 - 9 2066 * (0 - no compression, 9 - "maximal" compression). Note that tests have 2067 * shown that zlib compression levels 3-6 usually perform as well as level 9 2068 * for PNG images, and do considerably fewer caclulations. In the future, 2069 * these values may not correspond directly to the zlib compression levels. 2070 */ 2071extern PNG_EXPORT(void,png_set_compression_level) PNGARG((png_structp png_ptr, 2072 int level)); 2073 2074extern PNG_EXPORT(void,png_set_compression_mem_level) 2075 PNGARG((png_structp png_ptr, int mem_level)); 2076 2077extern PNG_EXPORT(void,png_set_compression_strategy) 2078 PNGARG((png_structp png_ptr, int strategy)); 2079 2080extern PNG_EXPORT(void,png_set_compression_window_bits) 2081 PNGARG((png_structp png_ptr, int window_bits)); 2082 2083extern PNG_EXPORT(void,png_set_compression_method) PNGARG((png_structp png_ptr, 2084 int method)); 2085 2086/* These next functions are called for input/output, memory, and error 2087 * handling. They are in the file pngrio.c, pngwio.c, and pngerror.c, 2088 * and call standard C I/O routines such as fread(), fwrite(), and 2089 * fprintf(). These functions can be made to use other I/O routines 2090 * at run time for those applications that need to handle I/O in a 2091 * different manner by calling png_set_???_fn(). See libpng.txt for 2092 * more information. 2093 */ 2094 2095#ifdef PNG_STDIO_SUPPORTED 2096/* Initialize the input/output for the PNG file to the default functions. */ 2097extern PNG_EXPORT(void,png_init_io) PNGARG((png_structp png_ptr, png_FILE_p fp)); 2098#endif 2099 2100/* Replace the (error and abort), and warning functions with user 2101 * supplied functions. If no messages are to be printed you must still 2102 * write and use replacement functions. The replacement error_fn should 2103 * still do a longjmp to the last setjmp location if you are using this 2104 * method of error handling. If error_fn or warning_fn is NULL, the 2105 * default function will be used. 2106 */ 2107 2108extern PNG_EXPORT(void,png_set_error_fn) PNGARG((png_structp png_ptr, 2109 png_voidp error_ptr, png_error_ptr error_fn, png_error_ptr warning_fn)); 2110 2111/* Return the user pointer associated with the error functions */ 2112extern PNG_EXPORT(png_voidp,png_get_error_ptr) PNGARG((png_structp png_ptr)); 2113 2114/* Replace the default data output functions with a user supplied one(s). 2115 * If buffered output is not used, then output_flush_fn can be set to NULL. 2116 * If PNG_WRITE_FLUSH_SUPPORTED is not defined at libpng compile time 2117 * output_flush_fn will be ignored (and thus can be NULL). 2118 * It is probably a mistake to use NULL for output_flush_fn if 2119 * write_data_fn is not also NULL unless you have built libpng with 2120 * PNG_WRITE_FLUSH_SUPPORTED undefined, because in this case libpng's 2121 * default flush function, which uses the standard *FILE structure, will 2122 * be used. 2123 */ 2124extern PNG_EXPORT(void,png_set_write_fn) PNGARG((png_structp png_ptr, 2125 png_voidp io_ptr, png_rw_ptr write_data_fn, png_flush_ptr output_flush_fn)); 2126 2127/* Replace the default data input function with a user supplied one. */ 2128extern PNG_EXPORT(void,png_set_read_fn) PNGARG((png_structp png_ptr, 2129 png_voidp io_ptr, png_rw_ptr read_data_fn)); 2130 2131#ifdef PNG_INDEX_SUPPORTED 2132/* Set the data seek function with a user supplied one. 2133 * REQUIRED by partial image decode. 2134 */ 2135extern PNG_EXPORT(void,png_set_seek_fn) PNGARG((png_structp png_ptr, 2136 png_seek_ptr seek_data_fn)); 2137#endif 2138 2139/* Return the user pointer associated with the I/O functions */ 2140extern PNG_EXPORT(png_voidp,png_get_io_ptr) PNGARG((png_structp png_ptr)); 2141 2142extern PNG_EXPORT(void,png_set_read_status_fn) PNGARG((png_structp png_ptr, 2143 png_read_status_ptr read_row_fn)); 2144 2145extern PNG_EXPORT(void,png_set_write_status_fn) PNGARG((png_structp png_ptr, 2146 png_write_status_ptr write_row_fn)); 2147 2148#ifdef PNG_USER_MEM_SUPPORTED 2149/* Replace the default memory allocation functions with user supplied one(s). */ 2150extern PNG_EXPORT(void,png_set_mem_fn) PNGARG((png_structp png_ptr, 2151 png_voidp mem_ptr, png_malloc_ptr malloc_fn, png_free_ptr free_fn)); 2152/* Return the user pointer associated with the memory functions */ 2153extern PNG_EXPORT(png_voidp,png_get_mem_ptr) PNGARG((png_structp png_ptr)); 2154#endif 2155 2156#if defined(PNG_READ_USER_TRANSFORM_SUPPORTED) || \ 2157 defined(PNG_LEGACY_SUPPORTED) 2158extern PNG_EXPORT(void,png_set_read_user_transform_fn) PNGARG((png_structp 2159 png_ptr, png_user_transform_ptr read_user_transform_fn)); 2160#endif 2161 2162#if defined(PNG_WRITE_USER_TRANSFORM_SUPPORTED) || \ 2163 defined(PNG_LEGACY_SUPPORTED) 2164extern PNG_EXPORT(void,png_set_write_user_transform_fn) PNGARG((png_structp 2165 png_ptr, png_user_transform_ptr write_user_transform_fn)); 2166#endif 2167 2168#if defined(PNG_READ_USER_TRANSFORM_SUPPORTED) || \ 2169 defined(PNG_WRITE_USER_TRANSFORM_SUPPORTED) || \ 2170 defined(PNG_LEGACY_SUPPORTED) 2171extern PNG_EXPORT(void,png_set_user_transform_info) PNGARG((png_structp 2172 png_ptr, png_voidp user_transform_ptr, int user_transform_depth, 2173 int user_transform_channels)); 2174/* Return the user pointer associated with the user transform functions */ 2175extern PNG_EXPORT(png_voidp,png_get_user_transform_ptr) 2176 PNGARG((png_structp png_ptr)); 2177#endif 2178 2179#ifdef PNG_USER_CHUNKS_SUPPORTED 2180extern PNG_EXPORT(void,png_set_read_user_chunk_fn) PNGARG((png_structp png_ptr, 2181 png_voidp user_chunk_ptr, png_user_chunk_ptr read_user_chunk_fn)); 2182extern PNG_EXPORT(png_voidp,png_get_user_chunk_ptr) PNGARG((png_structp 2183 png_ptr)); 2184#endif 2185 2186#ifdef PNG_PROGRESSIVE_READ_SUPPORTED 2187/* Sets the function callbacks for the push reader, and a pointer to a 2188 * user-defined structure available to the callback functions. 2189 */ 2190extern PNG_EXPORT(void,png_set_progressive_read_fn) PNGARG((png_structp png_ptr, 2191 png_voidp progressive_ptr, 2192 png_progressive_info_ptr info_fn, png_progressive_row_ptr row_fn, 2193 png_progressive_end_ptr end_fn)); 2194 2195/* Returns the user pointer associated with the push read functions */ 2196extern PNG_EXPORT(png_voidp,png_get_progressive_ptr) 2197 PNGARG((png_structp png_ptr)); 2198 2199/* Function to be called when data becomes available */ 2200extern PNG_EXPORT(void,png_process_data) PNGARG((png_structp png_ptr, 2201 png_infop info_ptr, png_bytep buffer, png_size_t buffer_size)); 2202 2203/* Function that combines rows. Not very much different than the 2204 * png_combine_row() call. Is this even used????? 2205 */ 2206extern PNG_EXPORT(void,png_progressive_combine_row) PNGARG((png_structp png_ptr, 2207 png_bytep old_row, png_bytep new_row)); 2208#endif /* PNG_PROGRESSIVE_READ_SUPPORTED */ 2209 2210extern PNG_EXPORT(png_voidp,png_malloc) PNGARG((png_structp png_ptr, 2211 png_uint_32 size)) PNG_ALLOCATED; 2212 2213#ifdef PNG_1_0_X 2214# define png_malloc_warn png_malloc 2215#else 2216/* Added at libpng version 1.2.4 */ 2217extern PNG_EXPORT(png_voidp,png_malloc_warn) PNGARG((png_structp png_ptr, 2218 png_uint_32 size)) PNG_ALLOCATED; 2219#endif 2220 2221/* Frees a pointer allocated by png_malloc() */ 2222extern PNG_EXPORT(void,png_free) PNGARG((png_structp png_ptr, png_voidp ptr)); 2223 2224#ifdef PNG_1_0_X 2225/* Function to allocate memory for zlib. */ 2226extern PNG_EXPORT(voidpf,png_zalloc) PNGARG((voidpf png_ptr, uInt items, 2227 uInt size)); 2228 2229/* Function to free memory for zlib */ 2230extern PNG_EXPORT(void,png_zfree) PNGARG((voidpf png_ptr, voidpf ptr)); 2231#endif 2232 2233/* Free data that was allocated internally */ 2234extern PNG_EXPORT(void,png_free_data) PNGARG((png_structp png_ptr, 2235 png_infop info_ptr, png_uint_32 free_me, int num)); 2236#ifdef PNG_FREE_ME_SUPPORTED 2237/* Reassign responsibility for freeing existing data, whether allocated 2238 * by libpng or by the application 2239 */ 2240extern PNG_EXPORT(void,png_data_freer) PNGARG((png_structp png_ptr, 2241 png_infop info_ptr, int freer, png_uint_32 mask)); 2242#endif 2243/* Assignments for png_data_freer */ 2244#define PNG_DESTROY_WILL_FREE_DATA 1 2245#define PNG_SET_WILL_FREE_DATA 1 2246#define PNG_USER_WILL_FREE_DATA 2 2247/* Flags for png_ptr->free_me and info_ptr->free_me */ 2248#define PNG_FREE_HIST 0x0008 2249#define PNG_FREE_ICCP 0x0010 2250#define PNG_FREE_SPLT 0x0020 2251#define PNG_FREE_ROWS 0x0040 2252#define PNG_FREE_PCAL 0x0080 2253#define PNG_FREE_SCAL 0x0100 2254#define PNG_FREE_UNKN 0x0200 2255#define PNG_FREE_LIST 0x0400 2256#define PNG_FREE_PLTE 0x1000 2257#define PNG_FREE_TRNS 0x2000 2258#define PNG_FREE_TEXT 0x4000 2259#define PNG_FREE_ALL 0x7fff 2260#define PNG_FREE_MUL 0x4220 /* PNG_FREE_SPLT|PNG_FREE_TEXT|PNG_FREE_UNKN */ 2261 2262#ifdef PNG_USER_MEM_SUPPORTED 2263extern PNG_EXPORT(png_voidp,png_malloc_default) PNGARG((png_structp png_ptr, 2264 png_uint_32 size)) PNG_ALLOCATED; 2265extern PNG_EXPORT(void,png_free_default) PNGARG((png_structp png_ptr, 2266 png_voidp ptr)); 2267#endif 2268 2269extern PNG_EXPORT(png_voidp,png_memcpy_check) PNGARG((png_structp png_ptr, 2270 png_voidp s1, png_voidp s2, png_uint_32 size)) PNG_DEPRECATED; 2271 2272extern PNG_EXPORT(png_voidp,png_memset_check) PNGARG((png_structp png_ptr, 2273 png_voidp s1, int value, png_uint_32 size)) PNG_DEPRECATED; 2274 2275#if defined(USE_FAR_KEYWORD) /* memory model conversion function */ 2276extern void *png_far_to_near PNGARG((png_structp png_ptr,png_voidp ptr, 2277 int check)); 2278#endif /* USE_FAR_KEYWORD */ 2279 2280#ifndef PNG_NO_ERROR_TEXT 2281/* Fatal error in PNG image of libpng - can't continue */ 2282extern PNG_EXPORT(void,png_error) PNGARG((png_structp png_ptr, 2283 png_const_charp error_message)) PNG_NORETURN; 2284 2285/* The same, but the chunk name is prepended to the error string. */ 2286extern PNG_EXPORT(void,png_chunk_error) PNGARG((png_structp png_ptr, 2287 png_const_charp error_message)) PNG_NORETURN; 2288#else 2289/* Fatal error in PNG image of libpng - can't continue */ 2290extern PNG_EXPORT(void,png_err) PNGARG((png_structp png_ptr)) PNG_NORETURN; 2291#endif 2292 2293#ifndef PNG_NO_WARNINGS 2294/* Non-fatal error in libpng. Can continue, but may have a problem. */ 2295extern PNG_EXPORT(void,png_warning) PNGARG((png_structp png_ptr, 2296 png_const_charp warning_message)); 2297 2298#ifdef PNG_READ_SUPPORTED 2299/* Non-fatal error in libpng, chunk name is prepended to message. */ 2300extern PNG_EXPORT(void,png_chunk_warning) PNGARG((png_structp png_ptr, 2301 png_const_charp warning_message)); 2302#endif /* PNG_READ_SUPPORTED */ 2303#endif /* PNG_NO_WARNINGS */ 2304 2305/* The png_set_<chunk> functions are for storing values in the png_info_struct. 2306 * Similarly, the png_get_<chunk> calls are used to read values from the 2307 * png_info_struct, either storing the parameters in the passed variables, or 2308 * setting pointers into the png_info_struct where the data is stored. The 2309 * png_get_<chunk> functions return a non-zero value if the data was available 2310 * in info_ptr, or return zero and do not change any of the parameters if the 2311 * data was not available. 2312 * 2313 * These functions should be used instead of directly accessing png_info 2314 * to avoid problems with future changes in the size and internal layout of 2315 * png_info_struct. 2316 */ 2317/* Returns "flag" if chunk data is valid in info_ptr. */ 2318extern PNG_EXPORT(png_uint_32,png_get_valid) PNGARG((png_structp png_ptr, 2319png_infop info_ptr, png_uint_32 flag)); 2320 2321/* Returns number of bytes needed to hold a transformed row. */ 2322extern PNG_EXPORT(png_uint_32,png_get_rowbytes) PNGARG((png_structp png_ptr, 2323png_infop info_ptr)); 2324 2325#ifdef PNG_INFO_IMAGE_SUPPORTED 2326/* Returns row_pointers, which is an array of pointers to scanlines that was 2327 * returned from png_read_png(). 2328 */ 2329extern PNG_EXPORT(png_bytepp,png_get_rows) PNGARG((png_structp png_ptr, 2330png_infop info_ptr)); 2331/* Set row_pointers, which is an array of pointers to scanlines for use 2332 * by png_write_png(). 2333 */ 2334extern PNG_EXPORT(void,png_set_rows) PNGARG((png_structp png_ptr, 2335 png_infop info_ptr, png_bytepp row_pointers)); 2336#endif 2337 2338/* Returns number of color channels in image. */ 2339extern PNG_EXPORT(png_byte,png_get_channels) PNGARG((png_structp png_ptr, 2340png_infop info_ptr)); 2341 2342#ifdef PNG_EASY_ACCESS_SUPPORTED 2343/* Returns image width in pixels. */ 2344extern PNG_EXPORT(png_uint_32, png_get_image_width) PNGARG((png_structp 2345png_ptr, png_infop info_ptr)); 2346 2347/* Returns image height in pixels. */ 2348extern PNG_EXPORT(png_uint_32, png_get_image_height) PNGARG((png_structp 2349png_ptr, png_infop info_ptr)); 2350 2351/* Returns image bit_depth. */ 2352extern PNG_EXPORT(png_byte, png_get_bit_depth) PNGARG((png_structp 2353png_ptr, png_infop info_ptr)); 2354 2355/* Returns image color_type. */ 2356extern PNG_EXPORT(png_byte, png_get_color_type) PNGARG((png_structp 2357png_ptr, png_infop info_ptr)); 2358 2359/* Returns image filter_type. */ 2360extern PNG_EXPORT(png_byte, png_get_filter_type) PNGARG((png_structp 2361png_ptr, png_infop info_ptr)); 2362 2363/* Returns image interlace_type. */ 2364extern PNG_EXPORT(png_byte, png_get_interlace_type) PNGARG((png_structp 2365png_ptr, png_infop info_ptr)); 2366 2367/* Returns image compression_type. */ 2368extern PNG_EXPORT(png_byte, png_get_compression_type) PNGARG((png_structp 2369png_ptr, png_infop info_ptr)); 2370 2371/* Returns image resolution in pixels per meter, from pHYs chunk data. */ 2372extern PNG_EXPORT(png_uint_32, png_get_pixels_per_meter) PNGARG((png_structp 2373png_ptr, png_infop info_ptr)); 2374extern PNG_EXPORT(png_uint_32, png_get_x_pixels_per_meter) PNGARG((png_structp 2375png_ptr, png_infop info_ptr)); 2376extern PNG_EXPORT(png_uint_32, png_get_y_pixels_per_meter) PNGARG((png_structp 2377png_ptr, png_infop info_ptr)); 2378 2379/* Returns pixel aspect ratio, computed from pHYs chunk data. */ 2380#ifdef PNG_FLOATING_POINT_SUPPORTED 2381extern PNG_EXPORT(float, png_get_pixel_aspect_ratio) PNGARG((png_structp 2382png_ptr, png_infop info_ptr)); 2383#endif 2384 2385/* Returns image x, y offset in pixels or microns, from oFFs chunk data. */ 2386extern PNG_EXPORT(png_int_32, png_get_x_offset_pixels) PNGARG((png_structp 2387png_ptr, png_infop info_ptr)); 2388extern PNG_EXPORT(png_int_32, png_get_y_offset_pixels) PNGARG((png_structp 2389png_ptr, png_infop info_ptr)); 2390extern PNG_EXPORT(png_int_32, png_get_x_offset_microns) PNGARG((png_structp 2391png_ptr, png_infop info_ptr)); 2392extern PNG_EXPORT(png_int_32, png_get_y_offset_microns) PNGARG((png_structp 2393png_ptr, png_infop info_ptr)); 2394 2395#endif /* PNG_EASY_ACCESS_SUPPORTED */ 2396 2397/* Returns pointer to signature string read from PNG header */ 2398extern PNG_EXPORT(png_bytep,png_get_signature) PNGARG((png_structp png_ptr, 2399png_infop info_ptr)); 2400 2401#ifdef PNG_bKGD_SUPPORTED 2402extern PNG_EXPORT(png_uint_32,png_get_bKGD) PNGARG((png_structp png_ptr, 2403 png_infop info_ptr, png_color_16p *background)); 2404#endif 2405 2406#ifdef PNG_bKGD_SUPPORTED 2407extern PNG_EXPORT(void,png_set_bKGD) PNGARG((png_structp png_ptr, 2408 png_infop info_ptr, png_color_16p background)); 2409#endif 2410 2411#ifdef PNG_cHRM_SUPPORTED 2412#ifdef PNG_FLOATING_POINT_SUPPORTED 2413extern PNG_EXPORT(png_uint_32,png_get_cHRM) PNGARG((png_structp png_ptr, 2414 png_infop info_ptr, double *white_x, double *white_y, double *red_x, 2415 double *red_y, double *green_x, double *green_y, double *blue_x, 2416 double *blue_y)); 2417#endif 2418#ifdef PNG_FIXED_POINT_SUPPORTED 2419extern PNG_EXPORT(png_uint_32,png_get_cHRM_fixed) PNGARG((png_structp png_ptr, 2420 png_infop info_ptr, png_fixed_point *int_white_x, png_fixed_point 2421 *int_white_y, png_fixed_point *int_red_x, png_fixed_point *int_red_y, 2422 png_fixed_point *int_green_x, png_fixed_point *int_green_y, png_fixed_point 2423 *int_blue_x, png_fixed_point *int_blue_y)); 2424#endif 2425#endif 2426 2427#ifdef PNG_cHRM_SUPPORTED 2428#ifdef PNG_FLOATING_POINT_SUPPORTED 2429extern PNG_EXPORT(void,png_set_cHRM) PNGARG((png_structp png_ptr, 2430 png_infop info_ptr, double white_x, double white_y, double red_x, 2431 double red_y, double green_x, double green_y, double blue_x, double blue_y)); 2432#endif 2433#ifdef PNG_FIXED_POINT_SUPPORTED 2434extern PNG_EXPORT(void,png_set_cHRM_fixed) PNGARG((png_structp png_ptr, 2435 png_infop info_ptr, png_fixed_point int_white_x, png_fixed_point int_white_y, 2436 png_fixed_point int_red_x, png_fixed_point int_red_y, png_fixed_point 2437 int_green_x, png_fixed_point int_green_y, png_fixed_point int_blue_x, 2438 png_fixed_point int_blue_y)); 2439#endif 2440#endif 2441 2442#ifdef PNG_gAMA_SUPPORTED 2443#ifdef PNG_FLOATING_POINT_SUPPORTED 2444extern PNG_EXPORT(png_uint_32,png_get_gAMA) PNGARG((png_structp png_ptr, 2445 png_infop info_ptr, double *file_gamma)); 2446#endif 2447extern PNG_EXPORT(png_uint_32,png_get_gAMA_fixed) PNGARG((png_structp png_ptr, 2448 png_infop info_ptr, png_fixed_point *int_file_gamma)); 2449#endif 2450 2451#ifdef PNG_gAMA_SUPPORTED 2452#ifdef PNG_FLOATING_POINT_SUPPORTED 2453extern PNG_EXPORT(void,png_set_gAMA) PNGARG((png_structp png_ptr, 2454 png_infop info_ptr, double file_gamma)); 2455#endif 2456extern PNG_EXPORT(void,png_set_gAMA_fixed) PNGARG((png_structp png_ptr, 2457 png_infop info_ptr, png_fixed_point int_file_gamma)); 2458#endif 2459 2460#ifdef PNG_hIST_SUPPORTED 2461extern PNG_EXPORT(png_uint_32,png_get_hIST) PNGARG((png_structp png_ptr, 2462 png_infop info_ptr, png_uint_16p *hist)); 2463#endif 2464 2465#ifdef PNG_hIST_SUPPORTED 2466extern PNG_EXPORT(void,png_set_hIST) PNGARG((png_structp png_ptr, 2467 png_infop info_ptr, png_uint_16p hist)); 2468#endif 2469 2470extern PNG_EXPORT(png_uint_32,png_get_IHDR) PNGARG((png_structp png_ptr, 2471 png_infop info_ptr, png_uint_32 *width, png_uint_32 *height, 2472 int *bit_depth, int *color_type, int *interlace_method, 2473 int *compression_method, int *filter_method)); 2474 2475extern PNG_EXPORT(void,png_set_IHDR) PNGARG((png_structp png_ptr, 2476 png_infop info_ptr, png_uint_32 width, png_uint_32 height, int bit_depth, 2477 int color_type, int interlace_method, int compression_method, 2478 int filter_method)); 2479 2480#ifdef PNG_oFFs_SUPPORTED 2481extern PNG_EXPORT(png_uint_32,png_get_oFFs) PNGARG((png_structp png_ptr, 2482 png_infop info_ptr, png_int_32 *offset_x, png_int_32 *offset_y, 2483 int *unit_type)); 2484#endif 2485 2486#ifdef PNG_oFFs_SUPPORTED 2487extern PNG_EXPORT(void,png_set_oFFs) PNGARG((png_structp png_ptr, 2488 png_infop info_ptr, png_int_32 offset_x, png_int_32 offset_y, 2489 int unit_type)); 2490#endif 2491 2492#ifdef PNG_pCAL_SUPPORTED 2493extern PNG_EXPORT(png_uint_32,png_get_pCAL) PNGARG((png_structp png_ptr, 2494 png_infop info_ptr, png_charp *purpose, png_int_32 *X0, png_int_32 *X1, 2495 int *type, int *nparams, png_charp *units, png_charpp *params)); 2496#endif 2497 2498#ifdef PNG_pCAL_SUPPORTED 2499extern PNG_EXPORT(void,png_set_pCAL) PNGARG((png_structp png_ptr, 2500 png_infop info_ptr, png_charp purpose, png_int_32 X0, png_int_32 X1, 2501 int type, int nparams, png_charp units, png_charpp params)); 2502#endif 2503 2504#ifdef PNG_pHYs_SUPPORTED 2505extern PNG_EXPORT(png_uint_32,png_get_pHYs) PNGARG((png_structp png_ptr, 2506 png_infop info_ptr, png_uint_32 *res_x, png_uint_32 *res_y, int *unit_type)); 2507#endif 2508 2509#ifdef PNG_pHYs_SUPPORTED 2510extern PNG_EXPORT(void,png_set_pHYs) PNGARG((png_structp png_ptr, 2511 png_infop info_ptr, png_uint_32 res_x, png_uint_32 res_y, int unit_type)); 2512#endif 2513 2514extern PNG_EXPORT(png_uint_32,png_get_PLTE) PNGARG((png_structp png_ptr, 2515 png_infop info_ptr, png_colorp *palette, int *num_palette)); 2516 2517extern PNG_EXPORT(void,png_set_PLTE) PNGARG((png_structp png_ptr, 2518 png_infop info_ptr, png_colorp palette, int num_palette)); 2519 2520#ifdef PNG_sBIT_SUPPORTED 2521extern PNG_EXPORT(png_uint_32,png_get_sBIT) PNGARG((png_structp png_ptr, 2522 png_infop info_ptr, png_color_8p *sig_bit)); 2523#endif 2524 2525#ifdef PNG_sBIT_SUPPORTED 2526extern PNG_EXPORT(void,png_set_sBIT) PNGARG((png_structp png_ptr, 2527 png_infop info_ptr, png_color_8p sig_bit)); 2528#endif 2529 2530#ifdef PNG_sRGB_SUPPORTED 2531extern PNG_EXPORT(png_uint_32,png_get_sRGB) PNGARG((png_structp png_ptr, 2532 png_infop info_ptr, int *intent)); 2533#endif 2534 2535#ifdef PNG_sRGB_SUPPORTED 2536extern PNG_EXPORT(void,png_set_sRGB) PNGARG((png_structp png_ptr, 2537 png_infop info_ptr, int intent)); 2538extern PNG_EXPORT(void,png_set_sRGB_gAMA_and_cHRM) PNGARG((png_structp png_ptr, 2539 png_infop info_ptr, int intent)); 2540#endif 2541 2542#ifdef PNG_iCCP_SUPPORTED 2543extern PNG_EXPORT(png_uint_32,png_get_iCCP) PNGARG((png_structp png_ptr, 2544 png_infop info_ptr, png_charpp name, int *compression_type, 2545 png_charpp profile, png_uint_32 *proflen)); 2546 /* Note to maintainer: profile should be png_bytepp */ 2547#endif 2548 2549#ifdef PNG_iCCP_SUPPORTED 2550extern PNG_EXPORT(void,png_set_iCCP) PNGARG((png_structp png_ptr, 2551 png_infop info_ptr, png_charp name, int compression_type, 2552 png_charp profile, png_uint_32 proflen)); 2553 /* Note to maintainer: profile should be png_bytep */ 2554#endif 2555 2556#ifdef PNG_sPLT_SUPPORTED 2557extern PNG_EXPORT(png_uint_32,png_get_sPLT) PNGARG((png_structp png_ptr, 2558 png_infop info_ptr, png_sPLT_tpp entries)); 2559#endif 2560 2561#ifdef PNG_sPLT_SUPPORTED 2562extern PNG_EXPORT(void,png_set_sPLT) PNGARG((png_structp png_ptr, 2563 png_infop info_ptr, png_sPLT_tp entries, int nentries)); 2564#endif 2565 2566#ifdef PNG_TEXT_SUPPORTED 2567/* png_get_text also returns the number of text chunks in *num_text */ 2568extern PNG_EXPORT(png_uint_32,png_get_text) PNGARG((png_structp png_ptr, 2569 png_infop info_ptr, png_textp *text_ptr, int *num_text)); 2570#endif 2571 2572/* 2573 * Note while png_set_text() will accept a structure whose text, 2574 * language, and translated keywords are NULL pointers, the structure 2575 * returned by png_get_text will always contain regular 2576 * zero-terminated C strings. They might be empty strings but 2577 * they will never be NULL pointers. 2578 */ 2579 2580#ifdef PNG_TEXT_SUPPORTED 2581extern PNG_EXPORT(void,png_set_text) PNGARG((png_structp png_ptr, 2582 png_infop info_ptr, png_textp text_ptr, int num_text)); 2583#endif 2584 2585#ifdef PNG_tIME_SUPPORTED 2586extern PNG_EXPORT(png_uint_32,png_get_tIME) PNGARG((png_structp png_ptr, 2587 png_infop info_ptr, png_timep *mod_time)); 2588#endif 2589 2590#ifdef PNG_tIME_SUPPORTED 2591extern PNG_EXPORT(void,png_set_tIME) PNGARG((png_structp png_ptr, 2592 png_infop info_ptr, png_timep mod_time)); 2593#endif 2594 2595#ifdef PNG_tRNS_SUPPORTED 2596extern PNG_EXPORT(png_uint_32,png_get_tRNS) PNGARG((png_structp png_ptr, 2597 png_infop info_ptr, png_bytep *trans, int *num_trans, 2598 png_color_16p *trans_values)); 2599#endif 2600 2601#ifdef PNG_tRNS_SUPPORTED 2602extern PNG_EXPORT(void,png_set_tRNS) PNGARG((png_structp png_ptr, 2603 png_infop info_ptr, png_bytep trans, int num_trans, 2604 png_color_16p trans_values)); 2605#endif 2606 2607#ifdef PNG_tRNS_SUPPORTED 2608#endif 2609 2610#ifdef PNG_sCAL_SUPPORTED 2611#ifdef PNG_FLOATING_POINT_SUPPORTED 2612extern PNG_EXPORT(png_uint_32,png_get_sCAL) PNGARG((png_structp png_ptr, 2613 png_infop info_ptr, int *unit, double *width, double *height)); 2614#else 2615#ifdef PNG_FIXED_POINT_SUPPORTED 2616extern PNG_EXPORT(png_uint_32,png_get_sCAL_s) PNGARG((png_structp png_ptr, 2617 png_infop info_ptr, int *unit, png_charpp swidth, png_charpp sheight)); 2618#endif 2619#endif 2620#endif /* PNG_sCAL_SUPPORTED */ 2621 2622#ifdef PNG_sCAL_SUPPORTED 2623#ifdef PNG_FLOATING_POINT_SUPPORTED 2624extern PNG_EXPORT(void,png_set_sCAL) PNGARG((png_structp png_ptr, 2625 png_infop info_ptr, int unit, double width, double height)); 2626#else 2627#ifdef PNG_FIXED_POINT_SUPPORTED 2628extern PNG_EXPORT(void,png_set_sCAL_s) PNGARG((png_structp png_ptr, 2629 png_infop info_ptr, int unit, png_charp swidth, png_charp sheight)); 2630#endif 2631#endif 2632#endif /* PNG_sCAL_SUPPORTED || PNG_WRITE_sCAL_SUPPORTED */ 2633 2634#ifdef PNG_HANDLE_AS_UNKNOWN_SUPPORTED 2635/* Provide a list of chunks and how they are to be handled, if the built-in 2636 handling or default unknown chunk handling is not desired. Any chunks not 2637 listed will be handled in the default manner. The IHDR and IEND chunks 2638 must not be listed. 2639 keep = 0: follow default behaviour 2640 = 1: do not keep 2641 = 2: keep only if safe-to-copy 2642 = 3: keep even if unsafe-to-copy 2643*/ 2644extern PNG_EXPORT(void, png_set_keep_unknown_chunks) PNGARG((png_structp 2645 png_ptr, int keep, png_bytep chunk_list, int num_chunks)); 2646PNG_EXPORT(int,png_handle_as_unknown) PNGARG((png_structp png_ptr, png_bytep 2647 chunk_name)); 2648#endif 2649#ifdef PNG_UNKNOWN_CHUNKS_SUPPORTED 2650extern PNG_EXPORT(void, png_set_unknown_chunks) PNGARG((png_structp png_ptr, 2651 png_infop info_ptr, png_unknown_chunkp unknowns, int num_unknowns)); 2652extern PNG_EXPORT(void, png_set_unknown_chunk_location) 2653 PNGARG((png_structp png_ptr, png_infop info_ptr, int chunk, int location)); 2654extern PNG_EXPORT(png_uint_32,png_get_unknown_chunks) PNGARG((png_structp 2655 png_ptr, png_infop info_ptr, png_unknown_chunkpp entries)); 2656#endif 2657 2658/* Png_free_data() will turn off the "valid" flag for anything it frees. 2659 * If you need to turn it off for a chunk that your application has freed, 2660 * you can use png_set_invalid(png_ptr, info_ptr, PNG_INFO_CHNK); 2661 */ 2662extern PNG_EXPORT(void, png_set_invalid) PNGARG((png_structp png_ptr, 2663 png_infop info_ptr, int mask)); 2664 2665#ifdef PNG_INFO_IMAGE_SUPPORTED 2666/* The "params" pointer is currently not used and is for future expansion. */ 2667extern PNG_EXPORT(void, png_read_png) PNGARG((png_structp png_ptr, 2668 png_infop info_ptr, 2669 int transforms, 2670 png_voidp params)); 2671extern PNG_EXPORT(void, png_write_png) PNGARG((png_structp png_ptr, 2672 png_infop info_ptr, 2673 int transforms, 2674 png_voidp params)); 2675#endif 2676 2677/* Define PNG_DEBUG at compile time for debugging information. Higher 2678 * numbers for PNG_DEBUG mean more debugging information. This has 2679 * only been added since version 0.95 so it is not implemented throughout 2680 * libpng yet, but more support will be added as needed. 2681 */ 2682#ifdef PNG_DEBUG 2683#if (PNG_DEBUG > 0) 2684#if !defined(PNG_DEBUG_FILE) && defined(_MSC_VER) 2685#include <crtdbg.h> 2686#if (PNG_DEBUG > 1) 2687#ifndef _DEBUG 2688# define _DEBUG 2689#endif 2690#ifndef png_debug 2691#define png_debug(l,m) _RPT0(_CRT_WARN,m PNG_STRING_NEWLINE) 2692#endif 2693#ifndef png_debug1 2694#define png_debug1(l,m,p1) _RPT1(_CRT_WARN,m PNG_STRING_NEWLINE,p1) 2695#endif 2696#ifndef png_debug2 2697#define png_debug2(l,m,p1,p2) _RPT2(_CRT_WARN,m PNG_STRING_NEWLINE,p1,p2) 2698#endif 2699#endif 2700#else /* PNG_DEBUG_FILE || !_MSC_VER */ 2701#ifndef PNG_DEBUG_FILE 2702#define PNG_DEBUG_FILE stderr 2703#endif /* PNG_DEBUG_FILE */ 2704 2705#if (PNG_DEBUG > 1) 2706/* Note: ["%s"m PNG_STRING_NEWLINE] probably does not work on non-ISO 2707 * compilers. 2708 */ 2709# ifdef __STDC__ 2710# ifndef png_debug 2711# define png_debug(l,m) \ 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":"")))); \ 2716 } 2717# endif 2718# ifndef png_debug1 2719# define png_debug1(l,m,p1) \ 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); \ 2724 } 2725# endif 2726# ifndef png_debug2 2727# define png_debug2(l,m,p1,p2) \ 2728 { \ 2729 int num_tabs=l; \ 2730 fprintf(PNG_DEBUG_FILE,"%s"m PNG_STRING_NEWLINE,(num_tabs==1 ? "\t" : \ 2731 (num_tabs==2 ? "\t\t":(num_tabs>2 ? "\t\t\t":""))),p1,p2); \ 2732 } 2733# endif 2734# else /* __STDC __ */ 2735# ifndef png_debug 2736# define png_debug(l,m) \ 2737 { \ 2738 int num_tabs=l; \ 2739 char format[256]; \ 2740 snprintf(format,256,"%s%s%s",(num_tabs==1 ? "\t" : \ 2741 (num_tabs==2 ? "\t\t":(num_tabs>2 ? "\t\t\t":""))), \ 2742 m,PNG_STRING_NEWLINE); \ 2743 fprintf(PNG_DEBUG_FILE,format); \ 2744 } 2745# endif 2746# ifndef png_debug1 2747# define png_debug1(l,m,p1) \ 2748 { \ 2749 int num_tabs=l; \ 2750 char format[256]; \ 2751 snprintf(format,256,"%s%s%s",(num_tabs==1 ? "\t" : \ 2752 (num_tabs==2 ? "\t\t":(num_tabs>2 ? "\t\t\t":""))), \ 2753 m,PNG_STRING_NEWLINE); \ 2754 fprintf(PNG_DEBUG_FILE,format,p1); \ 2755 } 2756# endif 2757# ifndef png_debug2 2758# define png_debug2(l,m,p1,p2) \ 2759 { \ 2760 int num_tabs=l; \ 2761 char format[256]; \ 2762 snprintf(format,256,"%s%s%s",(num_tabs==1 ? "\t" : \ 2763 (num_tabs==2 ? "\t\t":(num_tabs>2 ? "\t\t\t":""))), \ 2764 m,PNG_STRING_NEWLINE); \ 2765 fprintf(PNG_DEBUG_FILE,format,p1,p2); \ 2766 } 2767# endif 2768# endif /* __STDC __ */ 2769#endif /* (PNG_DEBUG > 1) */ 2770 2771#endif /* _MSC_VER */ 2772#endif /* (PNG_DEBUG > 0) */ 2773#endif /* PNG_DEBUG */ 2774#ifndef png_debug 2775#define png_debug(l, m) 2776#endif 2777#ifndef png_debug1 2778#define png_debug1(l, m, p1) 2779#endif 2780#ifndef png_debug2 2781#define png_debug2(l, m, p1, p2) 2782#endif 2783 2784extern PNG_EXPORT(png_charp,png_get_copyright) PNGARG((png_structp png_ptr)); 2785extern PNG_EXPORT(png_charp,png_get_header_ver) PNGARG((png_structp png_ptr)); 2786extern PNG_EXPORT(png_charp,png_get_header_version) PNGARG((png_structp png_ptr)); 2787extern PNG_EXPORT(png_charp,png_get_libpng_ver) PNGARG((png_structp png_ptr)); 2788 2789#ifdef PNG_MNG_FEATURES_SUPPORTED 2790extern PNG_EXPORT(png_uint_32,png_permit_mng_features) PNGARG((png_structp 2791 png_ptr, png_uint_32 mng_features_permitted)); 2792#endif 2793 2794/* For use in png_set_keep_unknown, added to version 1.2.6 */ 2795#define PNG_HANDLE_CHUNK_AS_DEFAULT 0 2796#define PNG_HANDLE_CHUNK_NEVER 1 2797#define PNG_HANDLE_CHUNK_IF_SAFE 2 2798#define PNG_HANDLE_CHUNK_ALWAYS 3 2799 2800/* Added to version 1.2.0 */ 2801#ifdef PNG_ASSEMBLER_CODE_SUPPORTED 2802#ifdef PNG_MMX_CODE_SUPPORTED 2803#define PNG_ASM_FLAG_MMX_SUPPORT_COMPILED 0x01 /* not user-settable */ 2804#define PNG_ASM_FLAG_MMX_SUPPORT_IN_CPU 0x02 /* not user-settable */ 2805#define PNG_ASM_FLAG_MMX_READ_COMBINE_ROW 0x04 2806#define PNG_ASM_FLAG_MMX_READ_INTERLACE 0x08 2807#define PNG_ASM_FLAG_MMX_READ_FILTER_SUB 0x10 2808#define PNG_ASM_FLAG_MMX_READ_FILTER_UP 0x20 2809#define PNG_ASM_FLAG_MMX_READ_FILTER_AVG 0x40 2810#define PNG_ASM_FLAG_MMX_READ_FILTER_PAETH 0x80 2811#define PNG_ASM_FLAGS_INITIALIZED 0x80000000 /* not user-settable */ 2812 2813#define PNG_MMX_READ_FLAGS ( PNG_ASM_FLAG_MMX_READ_COMBINE_ROW \ 2814 | PNG_ASM_FLAG_MMX_READ_INTERLACE \ 2815 | PNG_ASM_FLAG_MMX_READ_FILTER_SUB \ 2816 | PNG_ASM_FLAG_MMX_READ_FILTER_UP \ 2817 | PNG_ASM_FLAG_MMX_READ_FILTER_AVG \ 2818 | PNG_ASM_FLAG_MMX_READ_FILTER_PAETH ) 2819#define PNG_MMX_WRITE_FLAGS ( 0 ) 2820 2821#define PNG_MMX_FLAGS ( PNG_ASM_FLAG_MMX_SUPPORT_COMPILED \ 2822 | PNG_ASM_FLAG_MMX_SUPPORT_IN_CPU \ 2823 | PNG_MMX_READ_FLAGS \ 2824 | PNG_MMX_WRITE_FLAGS ) 2825 2826#define PNG_SELECT_READ 1 2827#define PNG_SELECT_WRITE 2 2828#endif /* PNG_MMX_CODE_SUPPORTED */ 2829 2830#ifndef PNG_1_0_X 2831/* pngget.c */ 2832extern PNG_EXPORT(png_uint_32,png_get_mmx_flagmask) 2833 PNGARG((int flag_select, int *compilerID)); 2834 2835/* pngget.c */ 2836extern PNG_EXPORT(png_uint_32,png_get_asm_flagmask) 2837 PNGARG((int flag_select)); 2838 2839/* pngget.c */ 2840extern PNG_EXPORT(png_uint_32,png_get_asm_flags) 2841 PNGARG((png_structp png_ptr)); 2842 2843/* pngget.c */ 2844extern PNG_EXPORT(png_byte,png_get_mmx_bitdepth_threshold) 2845 PNGARG((png_structp png_ptr)); 2846 2847/* pngget.c */ 2848extern PNG_EXPORT(png_uint_32,png_get_mmx_rowbytes_threshold) 2849 PNGARG((png_structp png_ptr)); 2850 2851/* pngset.c */ 2852extern PNG_EXPORT(void,png_set_asm_flags) 2853 PNGARG((png_structp png_ptr, png_uint_32 asm_flags)); 2854 2855/* pngset.c */ 2856extern PNG_EXPORT(void,png_set_mmx_thresholds) 2857 PNGARG((png_structp png_ptr, png_byte mmx_bitdepth_threshold, 2858 png_uint_32 mmx_rowbytes_threshold)); 2859 2860#endif /* PNG_1_0_X */ 2861 2862#ifndef PNG_1_0_X 2863/* png.c, pnggccrd.c, or pngvcrd.c */ 2864extern PNG_EXPORT(int,png_mmx_support) PNGARG((void)); 2865#endif /* PNG_1_0_X */ 2866#endif /* PNG_ASSEMBLER_CODE_SUPPORTED */ 2867 2868/* Strip the prepended error numbers ("#nnn ") from error and warning 2869 * messages before passing them to the error or warning handler. 2870 */ 2871#ifdef PNG_ERROR_NUMBERS_SUPPORTED 2872extern PNG_EXPORT(void,png_set_strip_error_numbers) PNGARG((png_structp 2873 png_ptr, png_uint_32 strip_mode)); 2874#endif 2875 2876/* Added at libpng-1.2.6 */ 2877#ifdef PNG_SET_USER_LIMITS_SUPPORTED 2878extern PNG_EXPORT(void,png_set_user_limits) PNGARG((png_structp 2879 png_ptr, png_uint_32 user_width_max, png_uint_32 user_height_max)); 2880extern PNG_EXPORT(png_uint_32,png_get_user_width_max) PNGARG((png_structp 2881 png_ptr)); 2882extern PNG_EXPORT(png_uint_32,png_get_user_height_max) PNGARG((png_structp 2883 png_ptr)); 2884#endif 2885/* Maintainer: Put new public prototypes here ^, in libpng.3, and in 2886 * project defs 2887 */ 2888 2889#ifdef PNG_READ_COMPOSITE_NODIV_SUPPORTED 2890/* With these routines we avoid an integer divide, which will be slower on 2891 * most machines. However, it does take more operations than the corresponding 2892 * divide method, so it may be slower on a few RISC systems. There are two 2893 * shifts (by 8 or 16 bits) and an addition, versus a single integer divide. 2894 * 2895 * Note that the rounding factors are NOT supposed to be the same! 128 and 2896 * 32768 are correct for the NODIV code; 127 and 32767 are correct for the 2897 * standard method. 2898 * 2899 * [Optimized code by Greg Roelofs and Mark Adler...blame us for bugs. :-) ] 2900 */ 2901 2902 /* fg and bg should be in `gamma 1.0' space; alpha is the opacity */ 2903 2904# define png_composite(composite, fg, alpha, bg) \ 2905 { png_uint_16 temp = (png_uint_16)((png_uint_16)(fg) * (png_uint_16)(alpha) \ 2906 + (png_uint_16)(bg)*(png_uint_16)(255 - \ 2907 (png_uint_16)(alpha)) + (png_uint_16)128); \ 2908 (composite) = (png_byte)((temp + (temp >> 8)) >> 8); } 2909 2910# define png_composite_16(composite, fg, alpha, bg) \ 2911 { png_uint_32 temp = (png_uint_32)((png_uint_32)(fg) * (png_uint_32)(alpha) \ 2912 + (png_uint_32)(bg)*(png_uint_32)(65535L - \ 2913 (png_uint_32)(alpha)) + (png_uint_32)32768L); \ 2914 (composite) = (png_uint_16)((temp + (temp >> 16)) >> 16); } 2915 2916#else /* Standard method using integer division */ 2917 2918# define png_composite(composite, fg, alpha, bg) \ 2919 (composite) = (png_byte)(((png_uint_16)(fg) * (png_uint_16)(alpha) + \ 2920 (png_uint_16)(bg) * (png_uint_16)(255 - (png_uint_16)(alpha)) + \ 2921 (png_uint_16)127) / 255) 2922 2923# define png_composite_16(composite, fg, alpha, bg) \ 2924 (composite) = (png_uint_16)(((png_uint_32)(fg) * (png_uint_32)(alpha) + \ 2925 (png_uint_32)(bg)*(png_uint_32)(65535L - (png_uint_32)(alpha)) + \ 2926 (png_uint_32)32767) / (png_uint_32)65535L) 2927 2928#endif /* PNG_READ_COMPOSITE_NODIV_SUPPORTED */ 2929 2930/* Inline macros to do direct reads of bytes from the input buffer. These 2931 * require that you are using an architecture that uses PNG byte ordering 2932 * (MSB first) and supports unaligned data storage. I think that PowerPC 2933 * in big-endian mode and 680x0 are the only ones that will support this. 2934 * The x86 line of processors definitely do not. The png_get_int_32() 2935 * routine also assumes we are using two's complement format for negative 2936 * values, which is almost certainly true. 2937 */ 2938#ifdef PNG_READ_BIG_ENDIAN_SUPPORTED 2939# define png_get_uint_32(buf) ( *((png_uint_32p) (buf))) 2940# define png_get_uint_16(buf) ( *((png_uint_16p) (buf))) 2941# define png_get_int_32(buf) ( *((png_int_32p) (buf))) 2942#else 2943extern PNG_EXPORT(png_uint_32,png_get_uint_32) PNGARG((png_bytep buf)); 2944extern PNG_EXPORT(png_uint_16,png_get_uint_16) PNGARG((png_bytep buf)); 2945extern PNG_EXPORT(png_int_32,png_get_int_32) PNGARG((png_bytep buf)); 2946#endif /* !PNG_READ_BIG_ENDIAN_SUPPORTED */ 2947extern PNG_EXPORT(png_uint_32,png_get_uint_31) 2948 PNGARG((png_structp png_ptr, png_bytep buf)); 2949/* No png_get_int_16 -- may be added if there's a real need for it. */ 2950 2951/* Place a 32-bit number into a buffer in PNG byte order (big-endian). 2952 */ 2953extern PNG_EXPORT(void,png_save_uint_32) 2954 PNGARG((png_bytep buf, png_uint_32 i)); 2955extern PNG_EXPORT(void,png_save_int_32) 2956 PNGARG((png_bytep buf, png_int_32 i)); 2957 2958/* Place a 16-bit number into a buffer in PNG byte order. 2959 * The parameter is declared unsigned int, not png_uint_16, 2960 * just to avoid potential problems on pre-ANSI C compilers. 2961 */ 2962extern PNG_EXPORT(void,png_save_uint_16) 2963 PNGARG((png_bytep buf, unsigned int i)); 2964/* No png_save_int_16 -- may be added if there's a real need for it. */ 2965 2966/* ************************************************************************* */ 2967 2968/* These next functions are used internally in the code. They generally 2969 * shouldn't be used unless you are writing code to add or replace some 2970 * functionality in libpng. More information about most functions can 2971 * be found in the files where the functions are located. 2972 */ 2973 2974 2975/* Various modes of operation, that are visible to applications because 2976 * they are used for unknown chunk location. 2977 */ 2978#define PNG_HAVE_IHDR 0x01 2979#define PNG_HAVE_PLTE 0x02 2980#define PNG_HAVE_IDAT 0x04 2981#define PNG_AFTER_IDAT 0x08 /* Have complete zlib datastream */ 2982#define PNG_HAVE_IEND 0x10 2983 2984#ifdef PNG_INTERNAL 2985 2986/* More modes of operation. Note that after an init, mode is set to 2987 * zero automatically when the structure is created. 2988 */ 2989#define PNG_HAVE_gAMA 0x20 2990#define PNG_HAVE_cHRM 0x40 2991#define PNG_HAVE_sRGB 0x80 2992#define PNG_HAVE_CHUNK_HEADER 0x100 2993#define PNG_WROTE_tIME 0x200 2994#define PNG_WROTE_INFO_BEFORE_PLTE 0x400 2995#define PNG_BACKGROUND_IS_GRAY 0x800 2996#define PNG_HAVE_PNG_SIGNATURE 0x1000 2997#define PNG_HAVE_CHUNK_AFTER_IDAT 0x2000 /* Have another chunk after IDAT */ 2998 2999/* Flags for the transformations the PNG library does on the image data */ 3000#define PNG_BGR 0x0001 3001#define PNG_INTERLACE 0x0002 3002#define PNG_PACK 0x0004 3003#define PNG_SHIFT 0x0008 3004#define PNG_SWAP_BYTES 0x0010 3005#define PNG_INVERT_MONO 0x0020 3006#define PNG_DITHER 0x0040 3007#define PNG_BACKGROUND 0x0080 3008#define PNG_BACKGROUND_EXPAND 0x0100 3009 /* 0x0200 unused */ 3010#define PNG_16_TO_8 0x0400 3011#define PNG_RGBA 0x0800 3012#define PNG_EXPAND 0x1000 3013#define PNG_GAMMA 0x2000 3014#define PNG_GRAY_TO_RGB 0x4000 3015#define PNG_FILLER 0x8000L 3016#define PNG_PACKSWAP 0x10000L 3017#define PNG_SWAP_ALPHA 0x20000L 3018#define PNG_STRIP_ALPHA 0x40000L 3019#define PNG_INVERT_ALPHA 0x80000L 3020#define PNG_USER_TRANSFORM 0x100000L 3021#define PNG_RGB_TO_GRAY_ERR 0x200000L 3022#define PNG_RGB_TO_GRAY_WARN 0x400000L 3023#define PNG_RGB_TO_GRAY 0x600000L /* two bits, RGB_TO_GRAY_ERR|WARN */ 3024 /* 0x800000L Unused */ 3025#define PNG_ADD_ALPHA 0x1000000L /* Added to libpng-1.2.7 */ 3026#define PNG_EXPAND_tRNS 0x2000000L /* Added to libpng-1.2.9 */ 3027#define PNG_PREMULTIPLY_ALPHA 0x4000000L /* Added to libpng-1.2.41 */ 3028 /* by volker */ 3029 /* 0x8000000L unused */ 3030 /* 0x10000000L unused */ 3031 /* 0x20000000L unused */ 3032 /* 0x40000000L unused */ 3033 3034/* Flags for png_create_struct */ 3035#define PNG_STRUCT_PNG 0x0001 3036#define PNG_STRUCT_INFO 0x0002 3037 3038/* Scaling factor for filter heuristic weighting calculations */ 3039#define PNG_WEIGHT_SHIFT 8 3040#define PNG_WEIGHT_FACTOR (1<<(PNG_WEIGHT_SHIFT)) 3041#define PNG_COST_SHIFT 3 3042#define PNG_COST_FACTOR (1<<(PNG_COST_SHIFT)) 3043 3044/* Flags for the png_ptr->flags rather than declaring a byte for each one */ 3045#define PNG_FLAG_ZLIB_CUSTOM_STRATEGY 0x0001 3046#define PNG_FLAG_ZLIB_CUSTOM_LEVEL 0x0002 3047#define PNG_FLAG_ZLIB_CUSTOM_MEM_LEVEL 0x0004 3048#define PNG_FLAG_ZLIB_CUSTOM_WINDOW_BITS 0x0008 3049#define PNG_FLAG_ZLIB_CUSTOM_METHOD 0x0010 3050#define PNG_FLAG_ZLIB_FINISHED 0x0020 3051#define PNG_FLAG_ROW_INIT 0x0040 3052#define PNG_FLAG_FILLER_AFTER 0x0080 3053#define PNG_FLAG_CRC_ANCILLARY_USE 0x0100 3054#define PNG_FLAG_CRC_ANCILLARY_NOWARN 0x0200 3055#define PNG_FLAG_CRC_CRITICAL_USE 0x0400 3056#define PNG_FLAG_CRC_CRITICAL_IGNORE 0x0800 3057#define PNG_FLAG_FREE_PLTE 0x1000 3058#define PNG_FLAG_FREE_TRNS 0x2000 3059#define PNG_FLAG_FREE_HIST 0x4000 3060#define PNG_FLAG_KEEP_UNKNOWN_CHUNKS 0x8000L 3061#define PNG_FLAG_KEEP_UNSAFE_CHUNKS 0x10000L 3062#define PNG_FLAG_LIBRARY_MISMATCH 0x20000L 3063#define PNG_FLAG_STRIP_ERROR_NUMBERS 0x40000L 3064#define PNG_FLAG_STRIP_ERROR_TEXT 0x80000L 3065#define PNG_FLAG_MALLOC_NULL_MEM_OK 0x100000L 3066#define PNG_FLAG_ADD_ALPHA 0x200000L /* Added to libpng-1.2.8 */ 3067#define PNG_FLAG_STRIP_ALPHA 0x400000L /* Added to libpng-1.2.8 */ 3068 /* 0x800000L unused */ 3069 /* 0x1000000L unused */ 3070 /* 0x2000000L unused */ 3071 /* 0x4000000L unused */ 3072 /* 0x8000000L unused */ 3073 /* 0x10000000L unused */ 3074 /* 0x20000000L unused */ 3075 /* 0x40000000L unused */ 3076 3077#define PNG_FLAG_CRC_ANCILLARY_MASK (PNG_FLAG_CRC_ANCILLARY_USE | \ 3078 PNG_FLAG_CRC_ANCILLARY_NOWARN) 3079 3080#define PNG_FLAG_CRC_CRITICAL_MASK (PNG_FLAG_CRC_CRITICAL_USE | \ 3081 PNG_FLAG_CRC_CRITICAL_IGNORE) 3082 3083#define PNG_FLAG_CRC_MASK (PNG_FLAG_CRC_ANCILLARY_MASK | \ 3084 PNG_FLAG_CRC_CRITICAL_MASK) 3085 3086/* Save typing and make code easier to understand */ 3087 3088#define PNG_COLOR_DIST(c1, c2) (abs((int)((c1).red) - (int)((c2).red)) + \ 3089 abs((int)((c1).green) - (int)((c2).green)) + \ 3090 abs((int)((c1).blue) - (int)((c2).blue))) 3091 3092/* Added to libpng-1.2.6 JB */ 3093#define PNG_ROWBYTES(pixel_bits, width) \ 3094 ((pixel_bits) >= 8 ? \ 3095 ((width) * (((png_uint_32)(pixel_bits)) >> 3)) : \ 3096 (( ((width) * ((png_uint_32)(pixel_bits))) + 7) >> 3) ) 3097 3098/* PNG_OUT_OF_RANGE returns true if value is outside the range 3099 * ideal-delta..ideal+delta. Each argument is evaluated twice. 3100 * "ideal" and "delta" should be constants, normally simple 3101 * integers, "value" a variable. Added to libpng-1.2.6 JB 3102 */ 3103#define PNG_OUT_OF_RANGE(value, ideal, delta) \ 3104 ( (value) < (ideal)-(delta) || (value) > (ideal)+(delta) ) 3105 3106/* Variables declared in png.c - only it needs to define PNG_NO_EXTERN */ 3107#if !defined(PNG_NO_EXTERN) || defined(PNG_ALWAYS_EXTERN) 3108/* Place to hold the signature string for a PNG file. */ 3109#ifdef PNG_USE_GLOBAL_ARRAYS 3110 PNG_EXPORT_VAR (PNG_CONST png_byte FARDATA) png_sig[8]; 3111#else 3112#endif 3113#endif /* PNG_NO_EXTERN */ 3114 3115/* Constant strings for known chunk types. If you need to add a chunk, 3116 * define the name here, and add an invocation of the macro in png.c and 3117 * wherever it's needed. 3118 */ 3119#define PNG_IHDR png_byte png_IHDR[5] = { 73, 72, 68, 82, '\0'} 3120#define PNG_IDAT png_byte png_IDAT[5] = { 73, 68, 65, 84, '\0'} 3121#define PNG_IEND png_byte png_IEND[5] = { 73, 69, 78, 68, '\0'} 3122#define PNG_PLTE png_byte png_PLTE[5] = { 80, 76, 84, 69, '\0'} 3123#define PNG_bKGD png_byte png_bKGD[5] = { 98, 75, 71, 68, '\0'} 3124#define PNG_cHRM png_byte png_cHRM[5] = { 99, 72, 82, 77, '\0'} 3125#define PNG_gAMA png_byte png_gAMA[5] = {103, 65, 77, 65, '\0'} 3126#define PNG_hIST png_byte png_hIST[5] = {104, 73, 83, 84, '\0'} 3127#define PNG_iCCP png_byte png_iCCP[5] = {105, 67, 67, 80, '\0'} 3128#define PNG_iTXt png_byte png_iTXt[5] = {105, 84, 88, 116, '\0'} 3129#define PNG_oFFs png_byte png_oFFs[5] = {111, 70, 70, 115, '\0'} 3130#define PNG_pCAL png_byte png_pCAL[5] = {112, 67, 65, 76, '\0'} 3131#define PNG_sCAL png_byte png_sCAL[5] = {115, 67, 65, 76, '\0'} 3132#define PNG_pHYs png_byte png_pHYs[5] = {112, 72, 89, 115, '\0'} 3133#define PNG_sBIT png_byte png_sBIT[5] = {115, 66, 73, 84, '\0'} 3134#define PNG_sPLT png_byte png_sPLT[5] = {115, 80, 76, 84, '\0'} 3135#define PNG_sRGB png_byte png_sRGB[5] = {115, 82, 71, 66, '\0'} 3136#define PNG_tEXt png_byte png_tEXt[5] = {116, 69, 88, 116, '\0'} 3137#define PNG_tIME png_byte png_tIME[5] = {116, 73, 77, 69, '\0'} 3138#define PNG_tRNS png_byte png_tRNS[5] = {116, 82, 78, 83, '\0'} 3139#define PNG_zTXt png_byte png_zTXt[5] = {122, 84, 88, 116, '\0'} 3140 3141#ifdef PNG_USE_GLOBAL_ARRAYS 3142PNG_EXPORT_VAR (png_byte FARDATA) png_IHDR[5]; 3143PNG_EXPORT_VAR (png_byte FARDATA) png_IDAT[5]; 3144PNG_EXPORT_VAR (png_byte FARDATA) png_IEND[5]; 3145PNG_EXPORT_VAR (png_byte FARDATA) png_PLTE[5]; 3146PNG_EXPORT_VAR (png_byte FARDATA) png_bKGD[5]; 3147PNG_EXPORT_VAR (png_byte FARDATA) png_cHRM[5]; 3148PNG_EXPORT_VAR (png_byte FARDATA) png_gAMA[5]; 3149PNG_EXPORT_VAR (png_byte FARDATA) png_hIST[5]; 3150PNG_EXPORT_VAR (png_byte FARDATA) png_iCCP[5]; 3151PNG_EXPORT_VAR (png_byte FARDATA) png_iTXt[5]; 3152PNG_EXPORT_VAR (png_byte FARDATA) png_oFFs[5]; 3153PNG_EXPORT_VAR (png_byte FARDATA) png_pCAL[5]; 3154PNG_EXPORT_VAR (png_byte FARDATA) png_sCAL[5]; 3155PNG_EXPORT_VAR (png_byte FARDATA) png_pHYs[5]; 3156PNG_EXPORT_VAR (png_byte FARDATA) png_sBIT[5]; 3157PNG_EXPORT_VAR (png_byte FARDATA) png_sPLT[5]; 3158PNG_EXPORT_VAR (png_byte FARDATA) png_sRGB[5]; 3159PNG_EXPORT_VAR (png_byte FARDATA) png_tEXt[5]; 3160PNG_EXPORT_VAR (png_byte FARDATA) png_tIME[5]; 3161PNG_EXPORT_VAR (png_byte FARDATA) png_tRNS[5]; 3162PNG_EXPORT_VAR (png_byte FARDATA) png_zTXt[5]; 3163#endif /* PNG_USE_GLOBAL_ARRAYS */ 3164 3165#if defined(PNG_1_0_X) || defined (PNG_1_2_X) 3166/* Initialize png_ptr struct for reading, and allocate any other memory. 3167 * (old interface - DEPRECATED - use png_create_read_struct instead). 3168 */ 3169extern PNG_EXPORT(void,png_read_init) PNGARG((png_structp png_ptr)) 3170 PNG_DEPRECATED; 3171#undef png_read_init 3172#define png_read_init(png_ptr) png_read_init_3(&png_ptr, \ 3173 PNG_LIBPNG_VER_STRING, png_sizeof(png_struct)); 3174#endif 3175 3176extern PNG_EXPORT(void,png_read_init_3) PNGARG((png_structpp ptr_ptr, 3177 png_const_charp user_png_ver, png_size_t png_struct_size)); 3178#if defined(PNG_1_0_X) || defined (PNG_1_2_X) 3179extern PNG_EXPORT(void,png_read_init_2) PNGARG((png_structp png_ptr, 3180 png_const_charp user_png_ver, png_size_t png_struct_size, png_size_t 3181 png_info_size)); 3182#endif 3183 3184#if defined(PNG_1_0_X) || defined (PNG_1_2_X) 3185/* Initialize png_ptr struct for writing, and allocate any other memory. 3186 * (old interface - DEPRECATED - use png_create_write_struct instead). 3187 */ 3188extern PNG_EXPORT(void,png_write_init) PNGARG((png_structp png_ptr)) 3189 PNG_DEPRECATED; 3190#undef png_write_init 3191#define png_write_init(png_ptr) png_write_init_3(&png_ptr, \ 3192 PNG_LIBPNG_VER_STRING, png_sizeof(png_struct)); 3193#endif 3194 3195extern PNG_EXPORT(void,png_write_init_3) PNGARG((png_structpp ptr_ptr, 3196 png_const_charp user_png_ver, png_size_t png_struct_size)); 3197extern PNG_EXPORT(void,png_write_init_2) PNGARG((png_structp png_ptr, 3198 png_const_charp user_png_ver, png_size_t png_struct_size, png_size_t 3199 png_info_size)); 3200 3201/* Allocate memory for an internal libpng struct */ 3202PNG_EXTERN png_voidp png_create_struct PNGARG((int type)) PNG_PRIVATE; 3203 3204/* Free memory from internal libpng struct */ 3205PNG_EXTERN void png_destroy_struct PNGARG((png_voidp struct_ptr)) PNG_PRIVATE; 3206 3207PNG_EXTERN png_voidp png_create_struct_2 PNGARG((int type, png_malloc_ptr 3208 malloc_fn, png_voidp mem_ptr)) PNG_PRIVATE; 3209PNG_EXTERN void png_destroy_struct_2 PNGARG((png_voidp struct_ptr, 3210 png_free_ptr free_fn, png_voidp mem_ptr)) PNG_PRIVATE; 3211 3212/* Free any memory that info_ptr points to and reset struct. */ 3213PNG_EXTERN void png_info_destroy PNGARG((png_structp png_ptr, 3214 png_infop info_ptr)) PNG_PRIVATE; 3215 3216#ifndef PNG_1_0_X 3217/* Function to allocate memory for zlib. */ 3218PNG_EXTERN voidpf png_zalloc PNGARG((voidpf png_ptr, uInt items, 3219 uInt size)) PNG_PRIVATE; 3220 3221/* Function to free memory for zlib */ 3222PNG_EXTERN void png_zfree PNGARG((voidpf png_ptr, voidpf ptr)) PNG_PRIVATE; 3223 3224#ifdef PNG_SIZE_T 3225/* Function to convert a sizeof an item to png_sizeof item */ 3226 PNG_EXTERN png_size_t PNGAPI png_convert_size PNGARG((size_t size)) 3227 PNG_PRIVATE; 3228#endif 3229 3230/* Next four functions are used internally as callbacks. PNGAPI is required 3231 * but not PNG_EXPORT. PNGAPI added at libpng version 1.2.3. 3232 */ 3233 3234PNG_EXTERN void PNGAPI png_default_read_data PNGARG((png_structp png_ptr, 3235 png_bytep data, png_size_t length)) PNG_PRIVATE; 3236 3237#ifdef PNG_PROGRESSIVE_READ_SUPPORTED 3238PNG_EXTERN void PNGAPI png_push_fill_buffer PNGARG((png_structp png_ptr, 3239 png_bytep buffer, png_size_t length)) PNG_PRIVATE; 3240#endif 3241 3242PNG_EXTERN void PNGAPI png_default_write_data PNGARG((png_structp png_ptr, 3243 png_bytep data, png_size_t length)) PNG_PRIVATE; 3244 3245#ifdef PNG_WRITE_FLUSH_SUPPORTED 3246#ifdef PNG_STDIO_SUPPORTED 3247PNG_EXTERN void PNGAPI png_default_flush PNGARG((png_structp png_ptr)) 3248 PNG_PRIVATE; 3249#endif 3250#endif 3251#else /* PNG_1_0_X */ 3252#ifdef PNG_PROGRESSIVE_READ_SUPPORTED 3253PNG_EXTERN void png_push_fill_buffer PNGARG((png_structp png_ptr, 3254 png_bytep buffer, png_size_t length)) PNG_PRIVATE; 3255#endif 3256#endif /* PNG_1_0_X */ 3257 3258/* Reset the CRC variable */ 3259PNG_EXTERN void png_reset_crc PNGARG((png_structp png_ptr)) PNG_PRIVATE; 3260 3261/* Write the "data" buffer to whatever output you are using. */ 3262PNG_EXTERN void png_write_data PNGARG((png_structp png_ptr, png_bytep data, 3263 png_size_t length)) PNG_PRIVATE; 3264 3265/* Read data from whatever input you are using into the "data" buffer */ 3266PNG_EXTERN void png_read_data PNGARG((png_structp png_ptr, png_bytep data, 3267 png_size_t length)) PNG_PRIVATE; 3268 3269#ifdef PNG_INDEX_SUPPORTED 3270PNG_EXTERN void png_seek_data PNGARG((png_structp png_ptr, 3271 png_uint_32 length)) PNG_PRIVATE; 3272#endif 3273 3274/* Read bytes into buf, and update png_ptr->crc */ 3275PNG_EXTERN void png_crc_read PNGARG((png_structp png_ptr, png_bytep buf, 3276 png_size_t length)) PNG_PRIVATE; 3277 3278/* Decompress data in a chunk that uses compression */ 3279#if defined(PNG_zTXt_SUPPORTED) || defined(PNG_iTXt_SUPPORTED) || \ 3280 defined(PNG_iCCP_SUPPORTED) || defined(PNG_sPLT_SUPPORTED) 3281PNG_EXTERN void png_decompress_chunk PNGARG((png_structp png_ptr, 3282 int comp_type, png_size_t chunklength, 3283 png_size_t prefix_length, png_size_t *data_length)) PNG_PRIVATE; 3284#endif 3285 3286/* Read "skip" bytes, read the file crc, and (optionally) verify png_ptr->crc */ 3287PNG_EXTERN int png_crc_finish PNGARG((png_structp png_ptr, png_uint_32 skip) 3288 PNG_PRIVATE); 3289 3290#ifdef PNG_INDEX_SUPPORTED 3291/* Read "skip" bytes, read the file crc, and (optionally) verify png_ptr->crc */ 3292PNG_EXTERN int png_opt_crc_finish PNGARG((png_structp png_ptr, 3293 png_uint_32 skip, int check_crc) 3294 PNG_PRIVATE); 3295#endif 3296 3297/* Read the CRC from the file and compare it to the libpng calculated CRC */ 3298PNG_EXTERN int png_crc_error PNGARG((png_structp png_ptr)) PNG_PRIVATE; 3299 3300/* Calculate the CRC over a section of data. Note that we are only 3301 * passing a maximum of 64K on systems that have this as a memory limit, 3302 * since this is the maximum buffer size we can specify. 3303 */ 3304PNG_EXTERN void png_calculate_crc PNGARG((png_structp png_ptr, png_bytep ptr, 3305 png_size_t length)) PNG_PRIVATE; 3306 3307#ifdef PNG_WRITE_FLUSH_SUPPORTED 3308PNG_EXTERN void png_flush PNGARG((png_structp png_ptr)) PNG_PRIVATE; 3309#endif 3310 3311/* Simple function to write the signature */ 3312PNG_EXTERN void png_write_sig PNGARG((png_structp png_ptr)) PNG_PRIVATE; 3313 3314/* Write various chunks */ 3315 3316/* Write the IHDR chunk, and update the png_struct with the necessary 3317 * information. 3318 */ 3319PNG_EXTERN void png_write_IHDR PNGARG((png_structp png_ptr, png_uint_32 width, 3320 png_uint_32 height, 3321 int bit_depth, int color_type, int compression_method, int filter_method, 3322 int interlace_method)) PNG_PRIVATE; 3323 3324PNG_EXTERN void png_write_PLTE PNGARG((png_structp png_ptr, png_colorp palette, 3325 png_uint_32 num_pal)) PNG_PRIVATE; 3326 3327PNG_EXTERN void png_write_IDAT PNGARG((png_structp png_ptr, png_bytep data, 3328 png_size_t length)) PNG_PRIVATE; 3329 3330PNG_EXTERN void png_write_IEND PNGARG((png_structp png_ptr)) PNG_PRIVATE; 3331 3332#ifdef PNG_WRITE_gAMA_SUPPORTED 3333#ifdef PNG_FLOATING_POINT_SUPPORTED 3334PNG_EXTERN void png_write_gAMA PNGARG((png_structp png_ptr, double file_gamma)) 3335 PNG_PRIVATE; 3336#endif 3337#ifdef PNG_FIXED_POINT_SUPPORTED 3338PNG_EXTERN void png_write_gAMA_fixed PNGARG((png_structp png_ptr, 3339 png_fixed_point file_gamma)) PNG_PRIVATE; 3340#endif 3341#endif 3342 3343#ifdef PNG_WRITE_sBIT_SUPPORTED 3344PNG_EXTERN void png_write_sBIT PNGARG((png_structp png_ptr, png_color_8p sbit, 3345 int color_type)) PNG_PRIVATE; 3346#endif 3347 3348#ifdef PNG_WRITE_cHRM_SUPPORTED 3349#ifdef PNG_FLOATING_POINT_SUPPORTED 3350PNG_EXTERN void png_write_cHRM PNGARG((png_structp png_ptr, 3351 double white_x, double white_y, 3352 double red_x, double red_y, double green_x, double green_y, 3353 double blue_x, double blue_y)) PNG_PRIVATE; 3354#endif 3355#ifdef PNG_FIXED_POINT_SUPPORTED 3356PNG_EXTERN void png_write_cHRM_fixed PNGARG((png_structp png_ptr, 3357 png_fixed_point int_white_x, png_fixed_point int_white_y, 3358 png_fixed_point int_red_x, png_fixed_point int_red_y, png_fixed_point 3359 int_green_x, png_fixed_point int_green_y, png_fixed_point int_blue_x, 3360 png_fixed_point int_blue_y)) PNG_PRIVATE; 3361#endif 3362#endif 3363 3364#ifdef PNG_WRITE_sRGB_SUPPORTED 3365PNG_EXTERN void png_write_sRGB PNGARG((png_structp png_ptr, 3366 int intent)) PNG_PRIVATE; 3367#endif 3368 3369#ifdef PNG_WRITE_iCCP_SUPPORTED 3370PNG_EXTERN void png_write_iCCP PNGARG((png_structp png_ptr, 3371 png_charp name, int compression_type, 3372 png_charp profile, int proflen)) PNG_PRIVATE; 3373 /* Note to maintainer: profile should be png_bytep */ 3374#endif 3375 3376#ifdef PNG_WRITE_sPLT_SUPPORTED 3377PNG_EXTERN void png_write_sPLT PNGARG((png_structp png_ptr, 3378 png_sPLT_tp palette)) PNG_PRIVATE; 3379#endif 3380 3381#ifdef PNG_WRITE_tRNS_SUPPORTED 3382PNG_EXTERN void png_write_tRNS PNGARG((png_structp png_ptr, png_bytep trans, 3383 png_color_16p values, int number, int color_type)) PNG_PRIVATE; 3384#endif 3385 3386#ifdef PNG_WRITE_bKGD_SUPPORTED 3387PNG_EXTERN void png_write_bKGD PNGARG((png_structp png_ptr, 3388 png_color_16p values, int color_type)) PNG_PRIVATE; 3389#endif 3390 3391#ifdef PNG_WRITE_hIST_SUPPORTED 3392PNG_EXTERN void png_write_hIST PNGARG((png_structp png_ptr, png_uint_16p hist, 3393 int num_hist)) PNG_PRIVATE; 3394#endif 3395 3396#if defined(PNG_WRITE_TEXT_SUPPORTED) || defined(PNG_WRITE_pCAL_SUPPORTED) || \ 3397 defined(PNG_WRITE_iCCP_SUPPORTED) || defined(PNG_WRITE_sPLT_SUPPORTED) 3398PNG_EXTERN png_size_t png_check_keyword PNGARG((png_structp png_ptr, 3399 png_charp key, png_charpp new_key)) PNG_PRIVATE; 3400#endif 3401 3402#ifdef PNG_WRITE_tEXt_SUPPORTED 3403PNG_EXTERN void png_write_tEXt PNGARG((png_structp png_ptr, png_charp key, 3404 png_charp text, png_size_t text_len)) PNG_PRIVATE; 3405#endif 3406 3407#ifdef PNG_WRITE_zTXt_SUPPORTED 3408PNG_EXTERN void png_write_zTXt PNGARG((png_structp png_ptr, png_charp key, 3409 png_charp text, png_size_t text_len, int compression)) PNG_PRIVATE; 3410#endif 3411 3412#ifdef PNG_WRITE_iTXt_SUPPORTED 3413PNG_EXTERN void png_write_iTXt PNGARG((png_structp png_ptr, 3414 int compression, png_charp key, png_charp lang, png_charp lang_key, 3415 png_charp text)) PNG_PRIVATE; 3416#endif 3417 3418#ifdef PNG_TEXT_SUPPORTED /* Added at version 1.0.14 and 1.2.4 */ 3419PNG_EXTERN int png_set_text_2 PNGARG((png_structp png_ptr, 3420 png_infop info_ptr, png_textp text_ptr, int num_text)) PNG_PRIVATE; 3421#endif 3422 3423#ifdef PNG_WRITE_oFFs_SUPPORTED 3424PNG_EXTERN void png_write_oFFs PNGARG((png_structp png_ptr, 3425 png_int_32 x_offset, png_int_32 y_offset, int unit_type)) PNG_PRIVATE; 3426#endif 3427 3428#ifdef PNG_WRITE_pCAL_SUPPORTED 3429PNG_EXTERN void png_write_pCAL PNGARG((png_structp png_ptr, png_charp purpose, 3430 png_int_32 X0, png_int_32 X1, int type, int nparams, 3431 png_charp units, png_charpp params)) PNG_PRIVATE; 3432#endif 3433 3434#ifdef PNG_WRITE_pHYs_SUPPORTED 3435PNG_EXTERN void png_write_pHYs PNGARG((png_structp png_ptr, 3436 png_uint_32 x_pixels_per_unit, png_uint_32 y_pixels_per_unit, 3437 int unit_type)) PNG_PRIVATE; 3438#endif 3439 3440#ifdef PNG_WRITE_tIME_SUPPORTED 3441PNG_EXTERN void png_write_tIME PNGARG((png_structp png_ptr, 3442 png_timep mod_time)) PNG_PRIVATE; 3443#endif 3444 3445#ifdef PNG_WRITE_sCAL_SUPPORTED 3446#if defined(PNG_FLOATING_POINT_SUPPORTED) && !defined(PNG_NO_STDIO) 3447PNG_EXTERN void png_write_sCAL PNGARG((png_structp png_ptr, 3448 int unit, double width, double height)) PNG_PRIVATE; 3449#else 3450#ifdef PNG_FIXED_POINT_SUPPORTED 3451PNG_EXTERN void png_write_sCAL_s PNGARG((png_structp png_ptr, 3452 int unit, png_charp width, png_charp height)) PNG_PRIVATE; 3453#endif 3454#endif 3455#endif 3456 3457/* Called when finished processing a row of data */ 3458PNG_EXTERN void png_write_finish_row PNGARG((png_structp png_ptr)) PNG_PRIVATE; 3459 3460/* Internal use only. Called before first row of data */ 3461PNG_EXTERN void png_write_start_row PNGARG((png_structp png_ptr)) PNG_PRIVATE; 3462 3463#ifdef PNG_READ_GAMMA_SUPPORTED 3464PNG_EXTERN void png_build_gamma_table PNGARG((png_structp png_ptr)) PNG_PRIVATE; 3465#endif 3466 3467/* Combine a row of data, dealing with alpha, etc. if requested */ 3468PNG_EXTERN void png_combine_row PNGARG((png_structp png_ptr, png_bytep row, 3469 int mask)) PNG_PRIVATE; 3470 3471#ifdef PNG_READ_INTERLACING_SUPPORTED 3472/* Expand an interlaced row */ 3473/* OLD pre-1.0.9 interface: 3474PNG_EXTERN void png_do_read_interlace PNGARG((png_row_infop row_info, 3475 png_bytep row, int pass, png_uint_32 transformations)) PNG_PRIVATE; 3476 */ 3477PNG_EXTERN void png_do_read_interlace PNGARG((png_structp png_ptr)) PNG_PRIVATE; 3478#endif 3479 3480/* GRR TO DO (2.0 or whenever): simplify other internal calling interfaces */ 3481 3482#ifdef PNG_WRITE_INTERLACING_SUPPORTED 3483/* Grab pixels out of a row for an interlaced pass */ 3484PNG_EXTERN void png_do_write_interlace PNGARG((png_row_infop row_info, 3485 png_bytep row, int pass)) PNG_PRIVATE; 3486#endif 3487 3488/* Unfilter a row */ 3489PNG_EXTERN void png_read_filter_row PNGARG((png_structp png_ptr, 3490 png_row_infop row_info, png_bytep row, png_bytep prev_row, 3491 int filter)) PNG_PRIVATE; 3492 3493/* Choose the best filter to use and filter the row data */ 3494PNG_EXTERN void png_write_find_filter PNGARG((png_structp png_ptr, 3495 png_row_infop row_info)) PNG_PRIVATE; 3496 3497/* Write out the filtered row. */ 3498PNG_EXTERN void png_write_filtered_row PNGARG((png_structp png_ptr, 3499 png_bytep filtered_row)) PNG_PRIVATE; 3500/* Finish a row while reading, dealing with interlacing passes, etc. */ 3501PNG_EXTERN void png_read_finish_row PNGARG((png_structp png_ptr)); 3502 3503#ifdef PNG_INDEX_SUPPORTED 3504/* Update the decoder status to the given pass */ 3505PNG_EXTERN void png_set_interlaced_pass PNGARG((png_structp png_ptr, int pass)); 3506#endif 3507 3508/* Initialize the row buffers, etc. */ 3509PNG_EXTERN void png_read_start_row PNGARG((png_structp png_ptr)) PNG_PRIVATE; 3510/* Optional call to update the users info structure */ 3511PNG_EXTERN void png_read_transform_info PNGARG((png_structp png_ptr, 3512 png_infop info_ptr)) PNG_PRIVATE; 3513 3514/* These are the functions that do the transformations */ 3515#ifdef PNG_READ_FILLER_SUPPORTED 3516PNG_EXTERN void png_do_read_filler PNGARG((png_row_infop row_info, 3517 png_bytep row, png_uint_32 filler, png_uint_32 flags)) PNG_PRIVATE; 3518#endif 3519 3520#ifdef PNG_READ_SWAP_ALPHA_SUPPORTED 3521PNG_EXTERN void png_do_read_swap_alpha PNGARG((png_row_infop row_info, 3522 png_bytep row)) PNG_PRIVATE; 3523#endif 3524 3525#ifdef PNG_WRITE_SWAP_ALPHA_SUPPORTED 3526PNG_EXTERN void png_do_write_swap_alpha PNGARG((png_row_infop row_info, 3527 png_bytep row)) PNG_PRIVATE; 3528#endif 3529 3530#ifdef PNG_READ_INVERT_ALPHA_SUPPORTED 3531PNG_EXTERN void png_do_read_invert_alpha PNGARG((png_row_infop row_info, 3532 png_bytep row)) PNG_PRIVATE; 3533#endif 3534 3535#ifdef PNG_WRITE_INVERT_ALPHA_SUPPORTED 3536PNG_EXTERN void png_do_write_invert_alpha PNGARG((png_row_infop row_info, 3537 png_bytep row)) PNG_PRIVATE; 3538#endif 3539 3540#if defined(PNG_WRITE_FILLER_SUPPORTED) || \ 3541 defined(PNG_READ_STRIP_ALPHA_SUPPORTED) 3542PNG_EXTERN void png_do_strip_filler PNGARG((png_row_infop row_info, 3543 png_bytep row, png_uint_32 flags)) PNG_PRIVATE; 3544#endif 3545 3546#if defined(PNG_READ_SWAP_SUPPORTED) || defined(PNG_WRITE_SWAP_SUPPORTED) 3547PNG_EXTERN void png_do_swap PNGARG((png_row_infop row_info, 3548 png_bytep row)) PNG_PRIVATE; 3549#endif 3550 3551#if defined(PNG_READ_PACKSWAP_SUPPORTED) || defined(PNG_WRITE_PACKSWAP_SUPPORTED) 3552PNG_EXTERN void png_do_packswap PNGARG((png_row_infop row_info, 3553 png_bytep row)) PNG_PRIVATE; 3554#endif 3555 3556#ifdef PNG_READ_RGB_TO_GRAY_SUPPORTED 3557PNG_EXTERN int png_do_rgb_to_gray PNGARG((png_structp png_ptr, png_row_infop 3558 row_info, png_bytep row)) PNG_PRIVATE; 3559#endif 3560 3561#ifdef PNG_READ_GRAY_TO_RGB_SUPPORTED 3562PNG_EXTERN void png_do_gray_to_rgb PNGARG((png_row_infop row_info, 3563 png_bytep row)) PNG_PRIVATE; 3564#endif 3565 3566#ifdef PNG_READ_PACK_SUPPORTED 3567PNG_EXTERN void png_do_unpack PNGARG((png_row_infop row_info, 3568 png_bytep row)) PNG_PRIVATE; 3569#endif 3570 3571#ifdef PNG_READ_SHIFT_SUPPORTED 3572PNG_EXTERN void png_do_unshift PNGARG((png_row_infop row_info, png_bytep row, 3573 png_color_8p sig_bits)) PNG_PRIVATE; 3574#endif 3575 3576#if defined(PNG_READ_INVERT_SUPPORTED) || defined(PNG_WRITE_INVERT_SUPPORTED) 3577PNG_EXTERN void png_do_invert PNGARG((png_row_infop row_info, 3578 png_bytep row)) PNG_PRIVATE; 3579#endif 3580 3581#ifdef PNG_READ_16_TO_8_SUPPORTED 3582PNG_EXTERN void png_do_chop PNGARG((png_row_infop row_info, 3583 png_bytep row)) PNG_PRIVATE; 3584#endif 3585 3586#ifdef PNG_READ_DITHER_SUPPORTED 3587PNG_EXTERN void png_do_dither PNGARG((png_row_infop row_info, 3588 png_bytep row, png_bytep palette_lookup, 3589 png_bytep dither_lookup)) PNG_PRIVATE; 3590 3591# ifdef PNG_CORRECT_PALETTE_SUPPORTED 3592PNG_EXTERN void png_correct_palette PNGARG((png_structp png_ptr, 3593 png_colorp palette, int num_palette)) PNG_PRIVATE; 3594# endif 3595#endif 3596 3597#if defined(PNG_READ_BGR_SUPPORTED) || defined(PNG_WRITE_BGR_SUPPORTED) 3598PNG_EXTERN void png_do_bgr PNGARG((png_row_infop row_info, 3599 png_bytep row)) PNG_PRIVATE; 3600#endif 3601 3602#ifdef PNG_WRITE_PACK_SUPPORTED 3603PNG_EXTERN void png_do_pack PNGARG((png_row_infop row_info, 3604 png_bytep row, png_uint_32 bit_depth)) PNG_PRIVATE; 3605#endif 3606 3607#ifdef PNG_WRITE_SHIFT_SUPPORTED 3608PNG_EXTERN void png_do_shift PNGARG((png_row_infop row_info, png_bytep row, 3609 png_color_8p bit_depth)) PNG_PRIVATE; 3610#endif 3611 3612#ifdef PNG_READ_BACKGROUND_SUPPORTED 3613#ifdef PNG_READ_GAMMA_SUPPORTED 3614PNG_EXTERN void png_do_background PNGARG((png_row_infop row_info, png_bytep row, 3615 png_color_16p trans_values, png_color_16p background, 3616 png_color_16p background_1, 3617 png_bytep gamma_table, png_bytep gamma_from_1, png_bytep gamma_to_1, 3618 png_uint_16pp gamma_16, png_uint_16pp gamma_16_from_1, 3619 png_uint_16pp gamma_16_to_1, int gamma_shift)) PNG_PRIVATE; 3620#else 3621PNG_EXTERN void png_do_background PNGARG((png_row_infop row_info, png_bytep row, 3622 png_color_16p trans_values, png_color_16p background)) PNG_PRIVATE; 3623#endif 3624#endif 3625 3626#ifdef PNG_READ_GAMMA_SUPPORTED 3627PNG_EXTERN void png_do_gamma PNGARG((png_row_infop row_info, png_bytep row, 3628 png_bytep gamma_table, png_uint_16pp gamma_16_table, 3629 int gamma_shift)) PNG_PRIVATE; 3630#endif 3631 3632#ifdef PNG_READ_EXPAND_SUPPORTED 3633PNG_EXTERN void png_do_expand_palette PNGARG((png_row_infop row_info, 3634 png_bytep row, png_colorp palette, png_bytep trans, 3635 int num_trans)) PNG_PRIVATE; 3636PNG_EXTERN void png_do_expand PNGARG((png_row_infop row_info, 3637 png_bytep row, png_color_16p trans_value)) PNG_PRIVATE; 3638#endif 3639 3640/* The following decodes the appropriate chunks, and does error correction, 3641 * then calls the appropriate callback for the chunk if it is valid. 3642 */ 3643 3644/* Decode the IHDR chunk */ 3645PNG_EXTERN void png_handle_IHDR PNGARG((png_structp png_ptr, png_infop info_ptr, 3646 png_uint_32 length)) PNG_PRIVATE; 3647PNG_EXTERN void png_handle_PLTE PNGARG((png_structp png_ptr, png_infop info_ptr, 3648 png_uint_32 length)); 3649PNG_EXTERN void png_handle_IEND PNGARG((png_structp png_ptr, png_infop info_ptr, 3650 png_uint_32 length)); 3651 3652#ifdef PNG_READ_bKGD_SUPPORTED 3653PNG_EXTERN void png_handle_bKGD PNGARG((png_structp png_ptr, png_infop info_ptr, 3654 png_uint_32 length)) PNG_PRIVATE; 3655#endif 3656 3657#ifdef PNG_READ_cHRM_SUPPORTED 3658PNG_EXTERN void png_handle_cHRM PNGARG((png_structp png_ptr, png_infop info_ptr, 3659 png_uint_32 length)) PNG_PRIVATE; 3660#endif 3661 3662#ifdef PNG_READ_gAMA_SUPPORTED 3663PNG_EXTERN void png_handle_gAMA PNGARG((png_structp png_ptr, png_infop info_ptr, 3664 png_uint_32 length)) PNG_PRIVATE; 3665#endif 3666 3667#ifdef PNG_READ_hIST_SUPPORTED 3668PNG_EXTERN void png_handle_hIST PNGARG((png_structp png_ptr, png_infop info_ptr, 3669 png_uint_32 length)) PNG_PRIVATE; 3670#endif 3671 3672#ifdef PNG_READ_iCCP_SUPPORTED 3673extern void png_handle_iCCP PNGARG((png_structp png_ptr, png_infop info_ptr, 3674 png_uint_32 length)); 3675#endif /* PNG_READ_iCCP_SUPPORTED */ 3676 3677#ifdef PNG_READ_iTXt_SUPPORTED 3678PNG_EXTERN void png_handle_iTXt PNGARG((png_structp png_ptr, png_infop info_ptr, 3679 png_uint_32 length)) PNG_PRIVATE; 3680#endif 3681 3682#ifdef PNG_READ_oFFs_SUPPORTED 3683PNG_EXTERN void png_handle_oFFs PNGARG((png_structp png_ptr, png_infop info_ptr, 3684 png_uint_32 length)) PNG_PRIVATE; 3685#endif 3686 3687#ifdef PNG_READ_pCAL_SUPPORTED 3688PNG_EXTERN void png_handle_pCAL PNGARG((png_structp png_ptr, png_infop info_ptr, 3689 png_uint_32 length)) PNG_PRIVATE; 3690#endif 3691 3692#ifdef PNG_READ_pHYs_SUPPORTED 3693PNG_EXTERN void png_handle_pHYs PNGARG((png_structp png_ptr, png_infop info_ptr, 3694 png_uint_32 length)) PNG_PRIVATE; 3695#endif 3696 3697#ifdef PNG_READ_sBIT_SUPPORTED 3698PNG_EXTERN void png_handle_sBIT PNGARG((png_structp png_ptr, png_infop info_ptr, 3699 png_uint_32 length)) PNG_PRIVATE; 3700#endif 3701 3702#ifdef PNG_READ_sCAL_SUPPORTED 3703PNG_EXTERN void png_handle_sCAL PNGARG((png_structp png_ptr, png_infop info_ptr, 3704 png_uint_32 length)) PNG_PRIVATE; 3705#endif 3706 3707#ifdef PNG_READ_sPLT_SUPPORTED 3708extern void png_handle_sPLT PNGARG((png_structp png_ptr, png_infop info_ptr, 3709 png_uint_32 length)) PNG_PRIVATE; 3710#endif /* PNG_READ_sPLT_SUPPORTED */ 3711 3712#ifdef PNG_READ_sRGB_SUPPORTED 3713PNG_EXTERN void png_handle_sRGB PNGARG((png_structp png_ptr, png_infop info_ptr, 3714 png_uint_32 length)) PNG_PRIVATE; 3715#endif 3716 3717#ifdef PNG_READ_tEXt_SUPPORTED 3718PNG_EXTERN void png_handle_tEXt PNGARG((png_structp png_ptr, png_infop info_ptr, 3719 png_uint_32 length)) PNG_PRIVATE; 3720#endif 3721 3722#ifdef PNG_READ_tIME_SUPPORTED 3723PNG_EXTERN void png_handle_tIME PNGARG((png_structp png_ptr, png_infop info_ptr, 3724 png_uint_32 length)) PNG_PRIVATE; 3725#endif 3726 3727#ifdef PNG_READ_tRNS_SUPPORTED 3728PNG_EXTERN void png_handle_tRNS PNGARG((png_structp png_ptr, png_infop info_ptr, 3729 png_uint_32 length)) PNG_PRIVATE; 3730#endif 3731 3732#ifdef PNG_READ_zTXt_SUPPORTED 3733PNG_EXTERN void png_handle_zTXt PNGARG((png_structp png_ptr, png_infop info_ptr, 3734 png_uint_32 length)) PNG_PRIVATE; 3735#endif 3736 3737PNG_EXTERN void png_handle_unknown PNGARG((png_structp png_ptr, 3738 png_infop info_ptr, png_uint_32 length)) PNG_PRIVATE; 3739 3740PNG_EXTERN void png_check_chunk_name PNGARG((png_structp png_ptr, 3741 png_bytep chunk_name)) PNG_PRIVATE; 3742 3743/* Handle the transformations for reading and writing */ 3744PNG_EXTERN void png_do_read_transformations 3745 PNGARG((png_structp png_ptr)) PNG_PRIVATE; 3746PNG_EXTERN void png_do_write_transformations 3747 PNGARG((png_structp png_ptr)) PNG_PRIVATE; 3748 3749PNG_EXTERN void png_init_read_transformations 3750 PNGARG((png_structp png_ptr)) PNG_PRIVATE; 3751 3752#ifdef PNG_PROGRESSIVE_READ_SUPPORTED 3753PNG_EXTERN void png_push_read_chunk PNGARG((png_structp png_ptr, 3754 png_infop info_ptr)) PNG_PRIVATE; 3755PNG_EXTERN void png_push_read_sig PNGARG((png_structp png_ptr, 3756 png_infop info_ptr)) PNG_PRIVATE; 3757PNG_EXTERN void png_push_check_crc PNGARG((png_structp png_ptr)) PNG_PRIVATE; 3758PNG_EXTERN void png_push_crc_skip PNGARG((png_structp png_ptr, 3759 png_uint_32 length)) PNG_PRIVATE; 3760PNG_EXTERN void png_push_crc_finish PNGARG((png_structp png_ptr)) PNG_PRIVATE; 3761PNG_EXTERN void png_push_save_buffer PNGARG((png_structp png_ptr)) PNG_PRIVATE; 3762PNG_EXTERN void png_push_restore_buffer PNGARG((png_structp png_ptr, 3763 png_bytep buffer, png_size_t buffer_length)) PNG_PRIVATE; 3764PNG_EXTERN void png_push_read_IDAT PNGARG((png_structp png_ptr)) PNG_PRIVATE; 3765PNG_EXTERN void png_process_IDAT_data PNGARG((png_structp png_ptr, 3766 png_bytep buffer, png_size_t buffer_length)) PNG_PRIVATE; 3767PNG_EXTERN void png_push_process_row PNGARG((png_structp png_ptr)) PNG_PRIVATE; 3768PNG_EXTERN void png_push_handle_unknown PNGARG((png_structp png_ptr, 3769 png_infop info_ptr, png_uint_32 length)) PNG_PRIVATE; 3770PNG_EXTERN void png_push_have_info PNGARG((png_structp png_ptr, 3771 png_infop info_ptr)) PNG_PRIVATE; 3772PNG_EXTERN void png_push_have_end PNGARG((png_structp png_ptr, 3773 png_infop info_ptr)) PNG_PRIVATE; 3774PNG_EXTERN void png_push_have_row PNGARG((png_structp png_ptr, 3775 png_bytep row)) PNG_PRIVATE; 3776PNG_EXTERN void png_push_read_end PNGARG((png_structp png_ptr, 3777 png_infop info_ptr)) PNG_PRIVATE; 3778PNG_EXTERN void png_process_some_data PNGARG((png_structp png_ptr, 3779 png_infop info_ptr)) PNG_PRIVATE; 3780PNG_EXTERN void png_read_push_finish_row 3781 PNGARG((png_structp png_ptr)) PNG_PRIVATE; 3782#ifdef PNG_READ_tEXt_SUPPORTED 3783PNG_EXTERN void png_push_handle_tEXt PNGARG((png_structp png_ptr, 3784 png_infop info_ptr, png_uint_32 length)) PNG_PRIVATE; 3785PNG_EXTERN void png_push_read_tEXt PNGARG((png_structp png_ptr, 3786 png_infop info_ptr)) PNG_PRIVATE; 3787#endif 3788#ifdef PNG_READ_zTXt_SUPPORTED 3789PNG_EXTERN void png_push_handle_zTXt PNGARG((png_structp png_ptr, 3790 png_infop info_ptr, png_uint_32 length)) PNG_PRIVATE; 3791PNG_EXTERN void png_push_read_zTXt PNGARG((png_structp png_ptr, 3792 png_infop info_ptr)) PNG_PRIVATE; 3793#endif 3794#ifdef PNG_READ_iTXt_SUPPORTED 3795PNG_EXTERN void png_push_handle_iTXt PNGARG((png_structp png_ptr, 3796 png_infop info_ptr, png_uint_32 length)) PNG_PRIVATE; 3797PNG_EXTERN void png_push_read_iTXt PNGARG((png_structp png_ptr, 3798 png_infop info_ptr)) PNG_PRIVATE; 3799#endif 3800 3801#endif /* PNG_PROGRESSIVE_READ_SUPPORTED */ 3802 3803#ifdef PNG_MNG_FEATURES_SUPPORTED 3804PNG_EXTERN void png_do_read_intrapixel PNGARG((png_row_infop row_info, 3805 png_bytep row)) PNG_PRIVATE; 3806PNG_EXTERN void png_do_write_intrapixel PNGARG((png_row_infop row_info, 3807 png_bytep row)) PNG_PRIVATE; 3808#endif 3809 3810#ifdef PNG_ASSEMBLER_CODE_SUPPORTED 3811#ifdef PNG_MMX_CODE_SUPPORTED 3812/* png.c */ /* PRIVATE */ 3813PNG_EXTERN void png_init_mmx_flags PNGARG((png_structp png_ptr)) PNG_PRIVATE; 3814#endif 3815#endif 3816 3817 3818/* The following six functions will be exported in libpng-1.4.0. */ 3819#if defined(PNG_INCH_CONVERSIONS) && defined(PNG_FLOATING_POINT_SUPPORTED) 3820PNG_EXTERN png_uint_32 png_get_pixels_per_inch PNGARG((png_structp png_ptr, 3821png_infop info_ptr)); 3822 3823PNG_EXTERN png_uint_32 png_get_x_pixels_per_inch PNGARG((png_structp png_ptr, 3824png_infop info_ptr)); 3825 3826PNG_EXTERN png_uint_32 png_get_y_pixels_per_inch PNGARG((png_structp png_ptr, 3827png_infop info_ptr)); 3828 3829PNG_EXTERN float png_get_x_offset_inches PNGARG((png_structp png_ptr, 3830png_infop info_ptr)); 3831 3832PNG_EXTERN float png_get_y_offset_inches PNGARG((png_structp png_ptr, 3833png_infop info_ptr)); 3834 3835#ifdef PNG_pHYs_SUPPORTED 3836PNG_EXTERN png_uint_32 png_get_pHYs_dpi PNGARG((png_structp png_ptr, 3837png_infop info_ptr, png_uint_32 *res_x, png_uint_32 *res_y, int *unit_type)); 3838#endif /* PNG_pHYs_SUPPORTED */ 3839#endif /* PNG_INCH_CONVERSIONS && PNG_FLOATING_POINT_SUPPORTED */ 3840 3841/* Read the chunk header (length + type name) */ 3842PNG_EXTERN png_uint_32 png_read_chunk_header 3843 PNGARG((png_structp png_ptr)) PNG_PRIVATE; 3844 3845/* Added at libpng version 1.2.34 */ 3846#ifdef PNG_cHRM_SUPPORTED 3847PNG_EXTERN int png_check_cHRM_fixed PNGARG((png_structp png_ptr, 3848 png_fixed_point int_white_x, png_fixed_point int_white_y, 3849 png_fixed_point int_red_x, png_fixed_point int_red_y, png_fixed_point 3850 int_green_x, png_fixed_point int_green_y, png_fixed_point int_blue_x, 3851 png_fixed_point int_blue_y)) PNG_PRIVATE; 3852#endif 3853 3854#ifdef PNG_cHRM_SUPPORTED 3855#ifdef PNG_CHECK_cHRM_SUPPORTED 3856/* Added at libpng version 1.2.34 */ 3857PNG_EXTERN void png_64bit_product PNGARG((long v1, long v2, 3858 unsigned long *hi_product, unsigned long *lo_product)) PNG_PRIVATE; 3859#endif 3860#endif 3861 3862/* Added at libpng version 1.2.41 */ 3863PNG_EXTERN void png_check_IHDR PNGARG((png_structp png_ptr, 3864 png_uint_32 width, png_uint_32 height, int bit_depth, 3865 int color_type, int interlace_type, int compression_type, 3866 int filter_type)) PNG_PRIVATE; 3867 3868/* Added at libpng version 1.2.41 */ 3869PNG_EXTERN png_voidp png_calloc PNGARG((png_structp png_ptr, 3870 png_uint_32 size)); 3871 3872/* Maintainer: Put new private prototypes here ^ and in libpngpf.3 */ 3873 3874#endif /* PNG_INTERNAL */ 3875 3876#ifdef __cplusplus 3877} 3878#endif 3879 3880#endif /* PNG_VERSION_INFO_ONLY */ 3881/* Do not put anything past this line */ 3882#endif /* PNG_H */ 3883