| OLD | NEW |
|---|
| (Empty) |
| 1 | |
| 2 /* png.h - header file for PNG reference library | |
| 3 * | |
| 4 * libpng version 1.6.3 - July 18, 2013 | |
| 5 * Copyright (c) 1998-2013 Glenn Randers-Pehrson | |
| 6 * (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger) | |
| 7 * (Version 0.88 Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.) | |
| 8 * | |
| 9 * This code is released under the libpng license (See LICENSE, below) | |
| 10 * | |
| 11 * Authors and maintainers: | |
| 12 * libpng versions 0.71, May 1995, through 0.88, January 1996: Guy Schalnat | |
| 13 * libpng versions 0.89c, June 1996, through 0.96, May 1997: Andreas Dilger | |
| 14 * libpng versions 0.97, January 1998, through 1.6.3 - July 18, 2013: Glenn | |
| 15 * See also "Contributing Authors", below. | |
| 16 * | |
| 17 * Note about libpng version numbers: | |
| 18 * | |
| 19 * Due to various miscommunications, unforeseen code incompatibilities | |
| 20 * and occasional factors outside the authors' control, version numbering | |
| 21 * on the library has not always been consistent and straightforward. | |
| 22 * The following table summarizes matters since version 0.89c, which was | |
| 23 * the first widely used release: | |
| 24 * | |
| 25 * source png.h png.h shared-lib | |
| 26 * version string int version | |
| 27 * ------- ------ ----- ---------- | |
| 28 * 0.89c "1.0 beta 3" 0.89 89 1.0.89 | |
| 29 * 0.90 "1.0 beta 4" 0.90 90 0.90 [should have been 2.0.90] | |
| 30 * 0.95 "1.0 beta 5" 0.95 95 0.95 [should have been 2.0.95] | |
| 31 * 0.96 "1.0 beta 6" 0.96 96 0.96 [should have been 2.0.96] | |
| 32 * 0.97b "1.00.97 beta 7" 1.00.97 97 1.0.1 [should have been 2.0.97] | |
| 33 * 0.97c 0.97 97 2.0.97 | |
| 34 * 0.98 0.98 98 2.0.98 | |
| 35 * 0.99 0.99 98 2.0.99 | |
| 36 * 0.99a-m 0.99 99 2.0.99 | |
| 37 * 1.00 1.00 100 2.1.0 [100 should be 10000] | |
| 38 * 1.0.0 (from here on, the 100 2.1.0 [100 should be 10000] | |
| 39 * 1.0.1 png.h string is 10001 2.1.0 | |
| 40 * 1.0.1a-e identical to the 10002 from here on, the shared library | |
| 41 * 1.0.2 source version) 10002 is 2.V where V is the source code | |
| 42 * 1.0.2a-b 10003 version, except as noted. | |
| 43 * 1.0.3 10003 | |
| 44 * 1.0.3a-d 10004 | |
| 45 * 1.0.4 10004 | |
| 46 * 1.0.4a-f 10005 | |
| 47 * 1.0.5 (+ 2 patches) 10005 | |
| 48 * 1.0.5a-d 10006 | |
| 49 * 1.0.5e-r 10100 (not source compatible) | |
| 50 * 1.0.5s-v 10006 (not binary compatible) | |
| 51 * 1.0.6 (+ 3 patches) 10006 (still binary incompatible) | |
| 52 * 1.0.6d-f 10007 (still binary incompatible) | |
| 53 * 1.0.6g 10007 | |
| 54 * 1.0.6h 10007 10.6h (testing xy.z so-numbering) | |
| 55 * 1.0.6i 10007 10.6i | |
| 56 * 1.0.6j 10007 2.1.0.6j (incompatible with 1.0.0) | |
| 57 * 1.0.7beta11-14 DLLNUM 10007 2.1.0.7beta11-14 (binary compatible) | |
| 58 * 1.0.7beta15-18 1 10007 2.1.0.7beta15-18 (binary compatible) | |
| 59 * 1.0.7rc1-2 1 10007 2.1.0.7rc1-2 (binary compatible) | |
| 60 * 1.0.7 1 10007 (still compatible) | |
| 61 * 1.0.8beta1-4 1 10008 2.1.0.8beta1-4 | |
| 62 * 1.0.8rc1 1 10008 2.1.0.8rc1 | |
| 63 * 1.0.8 1 10008 2.1.0.8 | |
| 64 * 1.0.9beta1-6 1 10009 2.1.0.9beta1-6 | |
| 65 * 1.0.9rc1 1 10009 2.1.0.9rc1 | |
| 66 * 1.0.9beta7-10 1 10009 2.1.0.9beta7-10 | |
| 67 * 1.0.9rc2 1 10009 2.1.0.9rc2 | |
| 68 * 1.0.9 1 10009 2.1.0.9 | |
| 69 * 1.0.10beta1 1 10010 2.1.0.10beta1 | |
| 70 * 1.0.10rc1 1 10010 2.1.0.10rc1 | |
| 71 * 1.0.10 1 10010 2.1.0.10 | |
| 72 * 1.0.11beta1-3 1 10011 2.1.0.11beta1-3 | |
| 73 * 1.0.11rc1 1 10011 2.1.0.11rc1 | |
| 74 * 1.0.11 1 10011 2.1.0.11 | |
| 75 * 1.0.12beta1-2 2 10012 2.1.0.12beta1-2 | |
| 76 * 1.0.12rc1 2 10012 2.1.0.12rc1 | |
| 77 * 1.0.12 2 10012 2.1.0.12 | |
| 78 * 1.1.0a-f - 10100 2.1.1.0a-f (branch abandoned) | |
| 79 * 1.2.0beta1-2 2 10200 2.1.2.0beta1-2 | |
| 80 * 1.2.0beta3-5 3 10200 3.1.2.0beta3-5 | |
| 81 * 1.2.0rc1 3 10200 3.1.2.0rc1 | |
| 82 * 1.2.0 3 10200 3.1.2.0 | |
| 83 * 1.2.1beta1-4 3 10201 3.1.2.1beta1-4 | |
| 84 * 1.2.1rc1-2 3 10201 3.1.2.1rc1-2 | |
| 85 * 1.2.1 3 10201 3.1.2.1 | |
| 86 * 1.2.2beta1-6 12 10202 12.so.0.1.2.2beta1-6 | |
| 87 * 1.0.13beta1 10 10013 10.so.0.1.0.13beta1 | |
| 88 * 1.0.13rc1 10 10013 10.so.0.1.0.13rc1 | |
| 89 * 1.2.2rc1 12 10202 12.so.0.1.2.2rc1 | |
| 90 * 1.0.13 10 10013 10.so.0.1.0.13 | |
| 91 * 1.2.2 12 10202 12.so.0.1.2.2 | |
| 92 * 1.2.3rc1-6 12 10203 12.so.0.1.2.3rc1-6 | |
| 93 * 1.2.3 12 10203 12.so.0.1.2.3 | |
| 94 * 1.2.4beta1-3 13 10204 12.so.0.1.2.4beta1-3 | |
| 95 * 1.0.14rc1 13 10014 10.so.0.1.0.14rc1 | |
| 96 * 1.2.4rc1 13 10204 12.so.0.1.2.4rc1 | |
| 97 * 1.0.14 10 10014 10.so.0.1.0.14 | |
| 98 * 1.2.4 13 10204 12.so.0.1.2.4 | |
| 99 * 1.2.5beta1-2 13 10205 12.so.0.1.2.5beta1-2 | |
| 100 * 1.0.15rc1-3 10 10015 10.so.0.1.0.15rc1-3 | |
| 101 * 1.2.5rc1-3 13 10205 12.so.0.1.2.5rc1-3 | |
| 102 * 1.0.15 10 10015 10.so.0.1.0.15 | |
| 103 * 1.2.5 13 10205 12.so.0.1.2.5 | |
| 104 * 1.2.6beta1-4 13 10206 12.so.0.1.2.6beta1-4 | |
| 105 * 1.0.16 10 10016 10.so.0.1.0.16 | |
| 106 * 1.2.6 13 10206 12.so.0.1.2.6 | |
| 107 * 1.2.7beta1-2 13 10207 12.so.0.1.2.7beta1-2 | |
| 108 * 1.0.17rc1 10 10017 12.so.0.1.0.17rc1 | |
| 109 * 1.2.7rc1 13 10207 12.so.0.1.2.7rc1 | |
| 110 * 1.0.17 10 10017 12.so.0.1.0.17 | |
| 111 * 1.2.7 13 10207 12.so.0.1.2.7 | |
| 112 * 1.2.8beta1-5 13 10208 12.so.0.1.2.8beta1-5 | |
| 113 * 1.0.18rc1-5 10 10018 12.so.0.1.0.18rc1-5 | |
| 114 * 1.2.8rc1-5 13 10208 12.so.0.1.2.8rc1-5 | |
| 115 * 1.0.18 10 10018 12.so.0.1.0.18 | |
| 116 * 1.2.8 13 10208 12.so.0.1.2.8 | |
| 117 * 1.2.9beta1-3 13 10209 12.so.0.1.2.9beta1-3 | |
| 118 * 1.2.9beta4-11 13 10209 12.so.0.9[.0] | |
| 119 * 1.2.9rc1 13 10209 12.so.0.9[.0] | |
| 120 * 1.2.9 13 10209 12.so.0.9[.0] | |
| 121 * 1.2.10beta1-7 13 10210 12.so.0.10[.0] | |
| 122 * 1.2.10rc1-2 13 10210 12.so.0.10[.0] | |
| 123 * 1.2.10 13 10210 12.so.0.10[.0] | |
| 124 * 1.4.0beta1-5 14 10400 14.so.0.0[.0] | |
| 125 * 1.2.11beta1-4 13 10211 12.so.0.11[.0] | |
| 126 * 1.4.0beta7-8 14 10400 14.so.0.0[.0] | |
| 127 * 1.2.11 13 10211 12.so.0.11[.0] | |
| 128 * 1.2.12 13 10212 12.so.0.12[.0] | |
| 129 * 1.4.0beta9-14 14 10400 14.so.0.0[.0] | |
| 130 * 1.2.13 13 10213 12.so.0.13[.0] | |
| 131 * 1.4.0beta15-36 14 10400 14.so.0.0[.0] | |
| 132 * 1.4.0beta37-87 14 10400 14.so.14.0[.0] | |
| 133 * 1.4.0rc01 14 10400 14.so.14.0[.0] | |
| 134 * 1.4.0beta88-109 14 10400 14.so.14.0[.0] | |
| 135 * 1.4.0rc02-08 14 10400 14.so.14.0[.0] | |
| 136 * 1.4.0 14 10400 14.so.14.0[.0] | |
| 137 * 1.4.1beta01-03 14 10401 14.so.14.1[.0] | |
| 138 * 1.4.1rc01 14 10401 14.so.14.1[.0] | |
| 139 * 1.4.1beta04-12 14 10401 14.so.14.1[.0] | |
| 140 * 1.4.1 14 10401 14.so.14.1[.0] | |
| 141 * 1.4.2 14 10402 14.so.14.2[.0] | |
| 142 * 1.4.3 14 10403 14.so.14.3[.0] | |
| 143 * 1.4.4 14 10404 14.so.14.4[.0] | |
| 144 * 1.5.0beta01-58 15 10500 15.so.15.0[.0] | |
| 145 * 1.5.0rc01-07 15 10500 15.so.15.0[.0] | |
| 146 * 1.5.0 15 10500 15.so.15.0[.0] | |
| 147 * 1.5.1beta01-11 15 10501 15.so.15.1[.0] | |
| 148 * 1.5.1rc01-02 15 10501 15.so.15.1[.0] | |
| 149 * 1.5.1 15 10501 15.so.15.1[.0] | |
| 150 * 1.5.2beta01-03 15 10502 15.so.15.2[.0] | |
| 151 * 1.5.2rc01-03 15 10502 15.so.15.2[.0] | |
| 152 * 1.5.2 15 10502 15.so.15.2[.0] | |
| 153 * 1.5.3beta01-10 15 10503 15.so.15.3[.0] | |
| 154 * 1.5.3rc01-02 15 10503 15.so.15.3[.0] | |
| 155 * 1.5.3beta11 15 10503 15.so.15.3[.0] | |
| 156 * 1.5.3 [omitted] | |
| 157 * 1.5.4beta01-08 15 10504 15.so.15.4[.0] | |
| 158 * 1.5.4rc01 15 10504 15.so.15.4[.0] | |
| 159 * 1.5.4 15 10504 15.so.15.4[.0] | |
| 160 * 1.5.5beta01-08 15 10505 15.so.15.5[.0] | |
| 161 * 1.5.5rc01 15 10505 15.so.15.5[.0] | |
| 162 * 1.5.5 15 10505 15.so.15.5[.0] | |
| 163 * 1.5.6beta01-07 15 10506 15.so.15.6[.0] | |
| 164 * 1.5.6rc01-03 15 10506 15.so.15.6[.0] | |
| 165 * 1.5.6 15 10506 15.so.15.6[.0] | |
| 166 * 1.5.7beta01-05 15 10507 15.so.15.7[.0] | |
| 167 * 1.5.7rc01-03 15 10507 15.so.15.7[.0] | |
| 168 * 1.5.7 15 10507 15.so.15.7[.0] | |
| 169 * 1.6.0beta01-40 16 10600 16.so.16.0[.0] | |
| 170 * 1.6.0rc01-08 16 10600 16.so.16.0[.0] | |
| 171 * 1.6.0 16 10600 16.so.16.0[.0] | |
| 172 * 1.6.1beta01-09 16 10601 16.so.16.1[.0] | |
| 173 * 1.6.1rc01 16 10601 16.so.16.1[.0] | |
| 174 * 1.6.1 16 10601 16.so.16.1[.0] | |
| 175 * 1.6.2beta01 16 10602 16.so.16.2[.0] | |
| 176 * 1.6.2rc01-06 16 10602 16.so.16.2[.0] | |
| 177 * 1.6.2 16 10602 16.so.16.2[.0] | |
| 178 * 1.6.3beta01-11 16 10603 16.so.16.3[.0] | |
| 179 * 1.6.3rc01 16 10603 16.so.16.3[.0] | |
| 180 * 1.6.3 16 10603 16.so.16.3[.0] | |
| 181 * | |
| 182 * Henceforth the source version will match the shared-library major | |
| 183 * and minor numbers; the shared-library major version number will be | |
| 184 * used for changes in backward compatibility, as it is intended. The | |
| 185 * PNG_LIBPNG_VER macro, which is not used within libpng but is available | |
| 186 * for applications, is an unsigned integer of the form xyyzz corresponding | |
| 187 * to the source version x.y.z (leading zeros in y and z). Beta versions | |
| 188 * were given the previous public release number plus a letter, until | |
| 189 * version 1.0.6j; from then on they were given the upcoming public | |
| 190 * release number plus "betaNN" or "rcNN". | |
| 191 * | |
| 192 * Binary incompatibility exists only when applications make direct access | |
| 193 * to the info_ptr or png_ptr members through png.h, and the compiled | |
| 194 * application is loaded with a different version of the library. | |
| 195 * | |
| 196 * DLLNUM will change each time there are forward or backward changes | |
| 197 * in binary compatibility (e.g., when a new feature is added). | |
| 198 * | |
| 199 * See libpng-manual.txt or libpng.3 for more information. The PNG | |
| 200 * specification is available as a W3C Recommendation and as an ISO | |
| 201 * Specification, <http://www.w3.org/TR/2003/REC-PNG-20031110/ | |
| 202 */ | |
| 203 | |
| 204 /* | |
| 205 * COPYRIGHT NOTICE, DISCLAIMER, and LICENSE: | |
| 206 * | |
| 207 * If you modify libpng you may insert additional notices immediately following | |
| 208 * this sentence. | |
| 209 * | |
| 210 * This code is released under the libpng license. | |
| 211 * | |
| 212 * libpng versions 1.2.6, August 15, 2004, through 1.6.3, July 18, 2013, are | |
| 213 * Copyright (c) 2004, 2006-2013 Glenn Randers-Pehrson, and are | |
| 214 * distributed according to the same disclaimer and license as libpng-1.2.5 | |
| 215 * with the following individual added to the list of Contributing Authors: | |
| 216 * | |
| 217 * Cosmin Truta | |
| 218 * | |
| 219 * libpng versions 1.0.7, July 1, 2000, through 1.2.5, October 3, 2002, are | |
| 220 * Copyright (c) 2000-2002 Glenn Randers-Pehrson, and are | |
| 221 * distributed according to the same disclaimer and license as libpng-1.0.6 | |
| 222 * with the following individuals added to the list of Contributing Authors: | |
| 223 * | |
| 224 * Simon-Pierre Cadieux | |
| 225 * Eric S. Raymond | |
| 226 * Gilles Vollant | |
| 227 * | |
| 228 * and with the following additions to the disclaimer: | |
| 229 * | |
| 230 * There is no warranty against interference with your enjoyment of the | |
| 231 * library or against infringement. There is no warranty that our | |
| 232 * efforts or the library will fulfill any of your particular purposes | |
| 233 * or needs. This library is provided with all faults, and the entire | |
| 234 * risk of satisfactory quality, performance, accuracy, and effort is with | |
| 235 * the user. | |
| 236 * | |
| 237 * libpng versions 0.97, January 1998, through 1.0.6, March 20, 2000, are | |
| 238 * Copyright (c) 1998, 1999, 2000 Glenn Randers-Pehrson, and are | |
| 239 * distributed according to the same disclaimer and license as libpng-0.96, | |
| 240 * with the following individuals added to the list of Contributing Authors: | |
| 241 * | |
| 242 * Tom Lane | |
| 243 * Glenn Randers-Pehrson | |
| 244 * Willem van Schaik | |
| 245 * | |
| 246 * libpng versions 0.89, June 1996, through 0.96, May 1997, are | |
| 247 * Copyright (c) 1996, 1997 Andreas Dilger | |
| 248 * Distributed according to the same disclaimer and license as libpng-0.88, | |
| 249 * with the following individuals added to the list of Contributing Authors: | |
| 250 * | |
| 251 * John Bowler | |
| 252 * Kevin Bracey | |
| 253 * Sam Bushell | |
| 254 * Magnus Holmgren | |
| 255 * Greg Roelofs | |
| 256 * Tom Tanner | |
| 257 * | |
| 258 * libpng versions 0.5, May 1995, through 0.88, January 1996, are | |
| 259 * Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc. | |
| 260 * | |
| 261 * For the purposes of this copyright and license, "Contributing Authors" | |
| 262 * is defined as the following set of individuals: | |
| 263 * | |
| 264 * Andreas Dilger | |
| 265 * Dave Martindale | |
| 266 * Guy Eric Schalnat | |
| 267 * Paul Schmidt | |
| 268 * Tim Wegner | |
| 269 * | |
| 270 * The PNG Reference Library is supplied "AS IS". The Contributing Authors | |
| 271 * and Group 42, Inc. disclaim all warranties, expressed or implied, | |
| 272 * including, without limitation, the warranties of merchantability and of | |
| 273 * fitness for any purpose. The Contributing Authors and Group 42, Inc. | |
| 274 * assume no liability for direct, indirect, incidental, special, exemplary, | |
| 275 * or consequential damages, which may result from the use of the PNG | |
| 276 * Reference Library, even if advised of the possibility of such damage. | |
| 277 * | |
| 278 * Permission is hereby granted to use, copy, modify, and distribute this | |
| 279 * source code, or portions hereof, for any purpose, without fee, subject | |
| 280 * to the following restrictions: | |
| 281 * | |
| 282 * 1. The origin of this source code must not be misrepresented. | |
| 283 * | |
| 284 * 2. Altered versions must be plainly marked as such and must not | |
| 285 * be misrepresented as being the original source. | |
| 286 * | |
| 287 * 3. This Copyright notice may not be removed or altered from | |
| 288 * any source or altered source distribution. | |
| 289 * | |
| 290 * The Contributing Authors and Group 42, Inc. specifically permit, without | |
| 291 * fee, and encourage the use of this source code as a component to | |
| 292 * supporting the PNG file format in commercial products. If you use this | |
| 293 * source code in a product, acknowledgment is not required but would be | |
| 294 * appreciated. | |
| 295 */ | |
| 296 | |
| 297 /* | |
| 298 * A "png_get_copyright" function is available, for convenient use in "about" | |
| 299 * boxes and the like: | |
| 300 * | |
| 301 * printf("%s", png_get_copyright(NULL)); | |
| 302 * | |
| 303 * Also, the PNG logo (in PNG format, of course) is supplied in the | |
| 304 * files "pngbar.png" and "pngbar.jpg (88x31) and "pngnow.png" (98x31). | |
| 305 */ | |
| 306 | |
| 307 /* | |
| 308 * Libpng is OSI Certified Open Source Software. OSI Certified is a | |
| 309 * certification mark of the Open Source Initiative. | |
| 310 */ | |
| 311 | |
| 312 /* | |
| 313 * The contributing authors would like to thank all those who helped | |
| 314 * with testing, bug fixes, and patience. This wouldn't have been | |
| 315 * possible without all of you. | |
| 316 * | |
| 317 * Thanks to Frank J. T. Wojcik for helping with the documentation. | |
| 318 */ | |
| 319 | |
| 320 /* | |
| 321 * Y2K compliance in libpng: | |
| 322 * ========================= | |
| 323 * | |
| 324 * July 18, 2013 | |
| 325 * | |
| 326 * Since the PNG Development group is an ad-hoc body, we can't make | |
| 327 * an official declaration. | |
| 328 * | |
| 329 * This is your unofficial assurance that libpng from version 0.71 and | |
| 330 * upward through 1.6.3 are Y2K compliant. It is my belief that | |
| 331 * earlier versions were also Y2K compliant. | |
| 332 * | |
| 333 * Libpng only has two year fields. One is a 2-byte unsigned integer | |
| 334 * that will hold years up to 65535. The other, which is deprecated, | |
| 335 * holds the date in text format, and will hold years up to 9999. | |
| 336 * | |
| 337 * The integer is | |
| 338 * "png_uint_16 year" in png_time_struct. | |
| 339 * | |
| 340 * The string is | |
| 341 * "char time_buffer[29]" in png_struct. This is no longer used | |
| 342 * in libpng-1.6.x and will be removed from libpng-1.7.0. | |
| 343 * | |
| 344 * There are seven time-related functions: | |
| 345 * png.c: png_convert_to_rfc_1123_buffer() in png.c | |
| 346 * (formerly png_convert_to_rfc_1123() prior to libpng-1.5.x and | |
| 347 * png_convert_to_rfc_1152() in error prior to libpng-0.98) | |
| 348 * png_convert_from_struct_tm() in pngwrite.c, called in pngwrite.c | |
| 349 * png_convert_from_time_t() in pngwrite.c | |
| 350 * png_get_tIME() in pngget.c | |
| 351 * png_handle_tIME() in pngrutil.c, called in pngread.c | |
| 352 * png_set_tIME() in pngset.c | |
| 353 * png_write_tIME() in pngwutil.c, called in pngwrite.c | |
| 354 * | |
| 355 * All handle dates properly in a Y2K environment. The | |
| 356 * png_convert_from_time_t() function calls gmtime() to convert from system | |
| 357 * clock time, which returns (year - 1900), which we properly convert to | |
| 358 * the full 4-digit year. There is a possibility that libpng applications | |
| 359 * are not passing 4-digit years into the png_convert_to_rfc_1123_buffer() | |
| 360 * function, or that they are incorrectly passing only a 2-digit year | |
| 361 * instead of "year - 1900" into the png_convert_from_struct_tm() function, | |
| 362 * but this is not under our control. The libpng documentation has always | |
| 363 * stated that it works with 4-digit years, and the APIs have been | |
| 364 * documented as such. | |
| 365 * | |
| 366 * The tIME chunk itself is also Y2K compliant. It uses a 2-byte unsigned | |
| 367 * integer to hold the year, and can hold years as large as 65535. | |
| 368 * | |
| 369 * zlib, upon which libpng depends, is also Y2K compliant. It contains | |
| 370 * no date-related code. | |
| 371 * | |
| 372 * Glenn Randers-Pehrson | |
| 373 * libpng maintainer | |
| 374 * PNG Development Group | |
| 375 */ | |
| 376 | |
| 377 #ifndef PNG_H | |
| 378 #define PNG_H | |
| 379 | |
| 380 /* This is not the place to learn how to use libpng. The file libpng-manual.txt | |
| 381 * describes how to use libpng, and the file example.c summarizes it | |
| 382 * with some code on which to build. This file is useful for looking | |
| 383 * at the actual function definitions and structure components. | |
| 384 * | |
| 385 * If you just need to read a PNG file and don't want to read the documentation | |
| 386 * skip to the end of this file and read the section entitled 'simplified API'. | |
| 387 */ | |
| 388 | |
| 389 /* Sunliang.liu add 20100319 for avoid name conflict. */ | |
| 390 #define png_set_sig_bytes FOXIT_png_set_sig_bytes | |
| 391 #define png_sig_cmp FOXIT_png_sig_cmp | |
| 392 #define png_create_info_struct FOXIT_png_create_info_struct | |
| 393 #define png_destroy_info_struct FOXIT_png_destroy_info_struct | |
| 394 #define png_info_init_3 FOXIT_png_info_init_3 | |
| 395 #define png_data_freer FOXIT_png_data_freer | |
| 396 #define png_free_data FOXIT_png_free_data | |
| 397 #define png_info_destroy FOXIT_png_info_destroy | |
| 398 #define png_get_io_ptr FOXIT_png_get_io_ptr | |
| 399 #define png_init_io FOXIT_png_init_io | |
| 400 #define png_convert_to_rfc1123 FOXIT_png_convert_to_rfc1123 | |
| 401 #define png_get_copyright FOXIT_png_get_copyright | |
| 402 #define png_get_libpng_ver FOXIT_png_get_libpng_ver | |
| 403 #define png_get_header_ver FOXIT_png_get_header_ver | |
| 404 #define png_get_header_version FOXIT_png_get_header_version | |
| 405 #define png_handle_as_unknown FOXIT_png_handle_as_unknown | |
| 406 #define png_reset_zstream FOXIT_png_reset_zstream | |
| 407 #define png_access_version_number FOXIT_png_access_version_number | |
| 408 #define png_mmx_support FOXIT_png_mmx_support | |
| 409 #define png_create_read_struct FOXIT_png_create_read_struct | |
| 410 #define png_create_read_struct_2 FOXIT_png_create_read_struct_2 | |
| 411 #define png_create_write_struct FOXIT_png_create_write_struct | |
| 412 #define png_create_write_struct_2 FOXIT_png_create_write_struct_2 | |
| 413 #define png_get_compression_buffer_size FOXIT_png_get_compression_buffer_size | |
| 414 #define png_set_compression_buffer_size FOXIT_png_set_compression_buffer_size | |
| 415 #define png_set_longjmp_fn FOXIT_png_set_longjmp_fn | |
| 416 #define png_longjmp FOXIT_png_longjmp | |
| 417 #define png_write_sig FOXIT_png_write_sig | |
| 418 #define png_write_chunk FOXIT_png_write_chunk | |
| 419 #define png_write_chunk_start FOXIT_png_write_chunk_start | |
| 420 #define png_write_chunk_data FOXIT_png_write_chunk_data | |
| 421 #define png_write_chunk_end FOXIT_png_write_chunk_end | |
| 422 #define png_write_info_before_PLTE FOXIT_png_write_info_before_PLTE | |
| 423 #define png_write_info FOXIT_png_write_info | |
| 424 #define png_read_info FOXIT_png_read_info | |
| 425 #define png_convert_to_rfc1123_buffer FOXIT_png_convert_to_rfc1123_buffer | |
| 426 #define png_convert_from_struct_tm FOXIT_png_convert_from_struct_tm | |
| 427 #define png_convert_from_time_t FOXIT_png_convert_from_time_t | |
| 428 #define png_set_expand FOXIT_png_set_expand | |
| 429 #define png_set_expand_gray_1_2_4_to_8 FOXIT_png_set_expand_gray_1_2_4_to_8 | |
| 430 #define png_set_palette_to_rgb FOXIT_png_set_palette_to_rgb | |
| 431 #define png_set_tRNS_to_alpha FOXIT_png_set_tRNS_to_alpha | |
| 432 #define png_set_expand_16 FOXIT_png_set_expand_16 | |
| 433 #define png_set_bgr FOXIT_png_set_bgr | |
| 434 #define png_set_gray_to_rgb FOXIT_png_set_gray_to_rgb | |
| 435 #define png_set_rgb_to_gray FOXIT_png_set_rgb_to_gray | |
| 436 #define png_set_rgb_to_gray_fixed FOXIT_png_set_rgb_to_gray_fixed | |
| 437 #define png_get_rgb_to_gray_status FOXIT_png_get_rgb_to_gray_status | |
| 438 #define png_build_grayscale_palette FOXIT_png_build_grayscale_palette | |
| 439 #define png_set_alpha_mode FOXIT_png_set_alpha_mode | |
| 440 #define png_set_alpha_mode_fixed FOXIT_png_set_alpha_mode_fixed | |
| 441 #define png_set_strip_alpha FOXIT_png_set_strip_alpha | |
| 442 #define png_set_swap_alpha FOXIT_png_set_swap_alpha | |
| 443 #define png_set_invert_alpha FOXIT_png_set_invert_alpha | |
| 444 #define png_set_filler FOXIT_png_set_filler | |
| 445 #define png_set_add_alpha FOXIT_png_set_add_alpha | |
| 446 #define png_set_swap FOXIT_png_set_swap | |
| 447 #define png_set_packing FOXIT_png_set_packing | |
| 448 #define png_set_packswap FOXIT_png_set_packswap | |
| 449 #define png_set_shift FOXIT_png_set_shift | |
| 450 #define png_set_interlace_handling FOXIT_png_set_interlace_handling | |
| 451 #define png_set_invert_mono FOXIT_png_set_invert_mono | |
| 452 #define png_set_background FOXIT_png_set_background | |
| 453 #define png_set_background_fixed FOXIT_png_set_background_fixed | |
| 454 #define png_set_scale_16 FOXIT_png_set_scale_16 | |
| 455 #define png_set_quantize FOXIT_png_set_quantize | |
| 456 #define png_set_gamma FOXIT_png_set_gamma | |
| 457 #define png_set_gamma_fixed FOXIT_png_set_gamma_fixed | |
| 458 #define png_set_flush FOXIT_png_set_flush | |
| 459 #define png_write_flush FOXIT_png_write_flush | |
| 460 #define png_start_read_image FOXIT_png_start_read_image | |
| 461 #define png_read_update_info FOXIT_png_read_update_info | |
| 462 #define png_read_rows FOXIT_png_read_rows | |
| 463 #define png_read_row FOXIT_png_read_row | |
| 464 #define png_read_image FOXIT_png_read_image | |
| 465 #define png_write_row FOXIT_png_write_row | |
| 466 #define png_write_rows FOXIT_png_write_rows | |
| 467 #define png_write_image FOXIT_png_write_image | |
| 468 #define png_write_end FOXIT_png_write_end | |
| 469 #define png_read_end FOXIT_png_read_end | |
| 470 #define png_destroy_read_struct FOXIT_png_destroy_read_struct | |
| 471 #define png_destroy_write_struct FOXIT_png_destroy_write_struct | |
| 472 #define png_set_crc_action FOXIT_png_set_crc_action | |
| 473 #define png_set_filter FOXIT_png_set_filter | |
| 474 #define png_set_filter_heuristics FOXIT_png_set_filter_heuristics | |
| 475 #define png_set_filter_heuristics_fixed FOXIT_png_set_filter_heuristics_fixed | |
| 476 #define png_set_compression_level FOXIT_png_set_compression_level | |
| 477 #define png_set_compression_mem_level FOXIT_png_set_compression_mem_level | |
| 478 #define png_set_compression_strategy FOXIT_png_set_compression_strategy | |
| 479 #define png_set_compression_window_bits FOXIT_png_set_compression_window_bits | |
| 480 #define png_set_compression_method FOXIT_png_set_compression_method | |
| 481 #define png_set_text_compression_level FOXIT_png_set_text_compression_level | |
| 482 #define png_set_text_compression_mem_level FOXIT_png_set_text_compression_mem_le
vel | |
| 483 #define png_set_text_compression_strategy FOXIT_png_set_text_compression_strateg
y | |
| 484 #define png_set_text_compression_window_bits FOXIT_png_set_text_compression_wind
ow_bits | |
| 485 #define png_set_text_compression_method FOXIT_png_set_text_compression_method | |
| 486 #define png_set_error_fn FOXIT_png_set_error_fn | |
| 487 #define png_get_error_ptr FOXIT_png_get_error_ptr | |
| 488 #define png_set_write_fn FOXIT_png_set_write_fn | |
| 489 #define png_set_read_fn FOXIT_png_set_read_fn | |
| 490 #define png_set_read_status_fn FOXIT_png_set_read_status_fn | |
| 491 #define png_set_write_status_fn FOXIT_png_set_write_status_fn | |
| 492 #define png_set_read_user_transform_fn FOXIT_png_set_read_user_transform_fn | |
| 493 #define png_set_write_user_transform_fn FOXIT_png_set_write_user_transform_fn | |
| 494 #define png_set_user_transform_info FOXIT_png_set_user_transform_info | |
| 495 #define png_get_user_transform_ptr FOXIT_png_get_user_transform_ptr | |
| 496 #define png_get_current_row_number FOXIT_png_get_current_row_number | |
| 497 #define png_get_current_pass_number FOXIT_png_get_current_pass_number | |
| 498 #define png_set_read_user_chunk_fn FOXIT_png_set_read_user_chunk_fn | |
| 499 #define png_get_user_chunk_ptr FOXIT_png_get_user_chunk_ptr | |
| 500 #define png_set_progressive_read_fn FOXIT_png_set_progressive_read_fn | |
| 501 #define png_get_progressive_ptr FOXIT_png_get_progressive_ptr | |
| 502 #define png_process_data FOXIT_png_process_data | |
| 503 #define png_process_data_pause FOXIT_png_process_data_pause | |
| 504 #define png_process_data_skip FOXIT_png_process_data_skip | |
| 505 #define png_progressive_combine_row FOXIT_png_progressive_combine_row | |
| 506 #define png_calloc FOXIT_png_calloc | |
| 507 #define png_error FOXIT_png_error | |
| 508 #define png_chunk_error FOXIT_png_chunk_error | |
| 509 #define png_err FOXIT_png_err | |
| 510 #define png_warning FOXIT_png_warning | |
| 511 #define png_chunk_warning FOXIT_png_chunk_warning | |
| 512 #define png_benign_error FOXIT_png_benign_error | |
| 513 #define png_chunk_benign_error FOXIT_png_chunk_benign_error | |
| 514 #define png_set_benign_errors FOXIT_png_set_benign_errors | |
| 515 #define png_get_valid FOXIT_png_get_valid | |
| 516 #define png_get_rowbytes FOXIT_png_get_rowbytes | |
| 517 #define png_get_rows FOXIT_png_get_rows | |
| 518 #define png_set_rows FOXIT_png_set_rows | |
| 519 #define png_get_channels FOXIT_png_get_channels | |
| 520 #define png_get_image_width FOXIT_png_get_image_width | |
| 521 #define png_get_image_height FOXIT_png_get_image_height | |
| 522 #define png_get_bit_depth FOXIT_png_get_bit_depth | |
| 523 #define png_get_color_type FOXIT_png_get_color_type | |
| 524 #define png_get_filter_type FOXIT_png_get_filter_type | |
| 525 #define png_get_interlace_type FOXIT_png_get_interlace_type | |
| 526 #define png_get_compression_type FOXIT_png_get_compression_type | |
| 527 #define png_get_pixels_per_meter FOXIT_png_get_pixels_per_meter | |
| 528 #define png_get_x_pixels_per_meter FOXIT_png_get_x_pixels_per_meter | |
| 529 #define png_get_y_pixels_per_meter FOXIT_png_get_y_pixels_per_meter | |
| 530 #define png_get_pixel_aspect_ratio FOXIT_png_get_pixel_aspect_ratio | |
| 531 #define png_get_pixel_aspect_ratio_fixed FOXIT_png_get_pixel_aspect_ratio_fixed | |
| 532 #define png_get_x_offset_pixels FOXIT_png_get_x_offset_pixels | |
| 533 #define png_get_y_offset_pixels FOXIT_png_get_y_offset_pixels | |
| 534 #define png_get_x_offset_microns FOXIT_png_get_x_offset_microns | |
| 535 #define png_get_y_offset_microns FOXIT_png_get_y_offset_microns | |
| 536 #define png_get_signature FOXIT_png_get_signature | |
| 537 #define png_get_bKGD FOXIT_png_get_bKGD | |
| 538 #define png_set_bKGD FOXIT_png_set_bKGD | |
| 539 #define png_get_cHRM FOXIT_png_get_cHRM | |
| 540 #define png_get_cHRM_XYZ FOXIT_png_get_cHRM_XYZ | |
| 541 #define png_get_cHRM_fixed FOXIT_png_get_cHRM_fixed | |
| 542 #define png_get_cHRM_XYZ_fixed FOXIT_png_get_cHRM_XYZ_fixed | |
| 543 #define png_set_cHRM FOXIT_png_set_cHRM | |
| 544 #define png_set_cHRM_XYZ FOXIT_png_set_cHRM_XYZ | |
| 545 #define png_set_cHRM_fixed FOXIT_png_set_cHRM_fixed | |
| 546 #define png_set_cHRM_XYZ_fixed FOXIT_png_set_cHRM_XYZ_fixed | |
| 547 #define png_get_gAMA FOXIT_png_get_gAMA | |
| 548 #define png_set_gAMA FOXIT_png_set_gAMA | |
| 549 #define png_set_gAMA_fixed FOXIT_png_set_gAMA_fixed | |
| 550 #define png_get_hIST FOXIT_png_get_hIST | |
| 551 #define png_set_hIST FOXIT_png_set_hIST | |
| 552 #define png_get_IHDR FOXIT_png_get_IHDR | |
| 553 #define png_set_IHDR FOXIT_png_set_IHDR | |
| 554 #define png_get_oFFs FOXIT_png_get_oFFs | |
| 555 #define png_set_oFFs FOXIT_png_set_oFFs | |
| 556 #define png_get_pCAL FOXIT_png_get_pCAL | |
| 557 #define png_set_pCAL FOXIT_png_set_pCAL | |
| 558 #define png_set_pHYs FOXIT_png_set_pHYs | |
| 559 #define png_get_PLTE FOXIT_png_get_PLTE | |
| 560 #define png_set_PLTE FOXIT_png_set_PLTE | |
| 561 #define png_get_sBIT FOXIT_png_get_sBIT | |
| 562 #define png_set_sBIT FOXIT_png_set_sBIT | |
| 563 #define png_get_sRGB FOXIT_png_get_sRGB | |
| 564 #define png_set_sRGB FOXIT_png_set_sRGB | |
| 565 #define png_set_sRGB_gAMA_and_cHRM FOXIT_png_set_sRGB_gAMA_and_cHRM | |
| 566 #define png_get_iCCP FOXIT_png_get_iCCP | |
| 567 #define png_set_iCCP FOXIT_png_set_iCCP | |
| 568 #define png_get_sPLT FOXIT_png_get_sPLT | |
| 569 #define png_set_sPLT FOXIT_png_set_sPLT | |
| 570 #define png_get_text FOXIT_png_get_text | |
| 571 #define png_set_text FOXIT_png_set_text | |
| 572 #define png_get_tIME FOXIT_png_get_tIME | |
| 573 #define png_set_tIME FOXIT_png_set_tIME | |
| 574 #define png_get_tRNS FOXIT_png_get_tRNS | |
| 575 #define png_set_tRNS FOXIT_png_set_tRNS | |
| 576 #define png_get_sCAL FOXIT_png_get_sCAL | |
| 577 #define png_get_sCAL_fixed FOXIT_png_get_sCAL_fixed | |
| 578 #define png_get_sCAL_s FOXIT_png_get_sCAL_s | |
| 579 #define png_set_sCAL FOXIT_png_set_sCAL | |
| 580 #define png_set_sCAL_s FOXIT_png_set_sCAL_s | |
| 581 #define png_set_keep_unknown_chunks FOXIT_png_set_keep_unknown_chunks | |
| 582 #define png_set_unknown_chunks FOXIT_png_set_unknown_chunks | |
| 583 #define png_set_unknown_chunk_location FOXIT_png_set_unknown_chunk_location | |
| 584 #define png_get_unknown_chunks FOXIT_png_get_unknown_chunks | |
| 585 #define png_set_invalid FOXIT_png_set_invalid | |
| 586 #define png_read_png FOXIT_png_read_png | |
| 587 #define png_write_png FOXIT_png_write_png | |
| 588 #define png_permit_mng_features FOXIT_png_permit_mng_features | |
| 589 #define png_set_strip_error_numbers FOXIT_png_set_strip_error_numbers | |
| 590 #define png_set_user_limits FOXIT_png_set_user_limits | |
| 591 #define png_get_user_width_max FOXIT_png_get_user_width_max | |
| 592 #define png_get_user_height_max FOXIT_png_get_user_height_max | |
| 593 #define png_set_chunk_cache_max FOXIT_png_set_chunk_cache_max | |
| 594 #define png_get_chunk_cache_max FOXIT_png_get_chunk_cache_max | |
| 595 #define png_set_chunk_malloc_max FOXIT_png_set_chunk_malloc_max | |
| 596 #define png_get_chunk_malloc_max FOXIT_png_get_chunk_malloc_max | |
| 597 #define png_get_pixels_per_inch FOXIT_png_get_pixels_per_inch | |
| 598 #define png_get_x_pixels_per_inch FOXIT_png_get_x_pixels_per_inch | |
| 599 #define png_get_y_pixels_per_inch FOXIT_png_get_y_pixels_per_inch | |
| 600 #define png_get_x_offset_inches FOXIT_png_get_x_offset_inches | |
| 601 #define png_get_x_offset_inches_fixed FOXIT_png_get_x_offset_inches_fixed | |
| 602 #define png_get_y_offset_inches FOXIT_png_get_y_offset_inches | |
| 603 #define png_get_y_offset_inches_fixed FOXIT_png_get_y_offset_inches_fixed | |
| 604 #define png_get_pHYs_dpi FOXIT_png_get_pHYs_dpi | |
| 605 #define png_get_io_state FOXIT_png_get_io_state | |
| 606 #define png_get_io_chunk_name FOXIT_png_get_io_chunk_name | |
| 607 #define png_get_io_chunk_type FOXIT_png_get_io_chunk_type | |
| 608 #define png_get_uint_31 FOXIT_png_get_uint_31 | |
| 609 #define png_get_uint_32 FOXIT_png_get_uint_32 | |
| 610 #define png_get_uint_16 FOXIT_png_get_uint_16 | |
| 611 #define png_get_int_32 FOXIT_png_get_int_32 | |
| 612 #define png_save_uint_32 FOXIT_png_save_uint_32 | |
| 613 #define png_save_int_32 FOXIT_png_save_int_32 | |
| 614 #define png_save_uint_16 FOXIT_png_save_uint_16 | |
| 615 #define png_image_begin_read_from_file FOXIT_png_image_begin_read_from_file | |
| 616 #define png_image_begin_read_from_stdio FOXIT_png_image_begin_read_from_stdio | |
| 617 #define png_image_begin_read_from_memory FOXIT_png_image_begin_read_from_memory | |
| 618 #define png_image_finish_read FOXIT_png_image_finish_read | |
| 619 #define png_image_free FOXIT_png_image_free | |
| 620 #define png_image_write_to_file FOXIT_png_image_write_to_file | |
| 621 #define png_image_write_to_stdio FOXIT_png_image_write_to_stdio | |
| 622 #define png_set_check_for_invalid_index FOXIT_png_set_check_for_invalid_index | |
| 623 #define png_get_palette_max FOXIT_png_get_palette_max | |
| 624 #define png_set_option FOXIT_png_set_option | |
| 625 | |
| 626 #define png_set_strip_16 FOXIT_png_set_strip_16 | |
| 627 #define png_64bit_product FOXIT_png_64bit_product | |
| 628 #define png_check_cHRM_fixed FOXIT_png_check_cHRM_fixed | |
| 629 #define png_free FOXIT_png_free | |
| 630 #define png_free_default FOXIT_png_free_default | |
| 631 #define png_get_mem_ptr FOXIT_png_get_mem_ptr | |
| 632 #define png_malloc FOXIT_png_malloc | |
| 633 #define png_malloc_default FOXIT_png_malloc_default | |
| 634 #define png_malloc_warn FOXIT_png_malloc_warn | |
| 635 #define png_memcpy_check FOXIT_png_memcpy_check | |
| 636 #define png_memset_check FOXIT_png_memset_check | |
| 637 #define png_pass_dsp_mask FOXIT_png_pass_dsp_mask | |
| 638 #define png_pass_inc FOXIT_png_pass_inc | |
| 639 #define png_pass_mask FOXIT_png_pass_mask | |
| 640 #define png_pass_start FOXIT_png_pass_start | |
| 641 #define png_pass_yinc FOXIT_png_pass_yinc | |
| 642 #define png_pass_ystart FOXIT_png_pass_ystart | |
| 643 #define png_set_mem_fn FOXIT_png_set_mem_fn | |
| 644 | |
| 645 /* Version information for png.h - this should match the version in png.c */ | |
| 646 #define PNG_LIBPNG_VER_STRING "1.6.3" | |
| 647 #define PNG_HEADER_VERSION_STRING \ | |
| 648 " libpng version 1.6.3 - July 18, 2013\n" | |
| 649 | |
| 650 #define PNG_LIBPNG_VER_SONUM 16 | |
| 651 #define PNG_LIBPNG_VER_DLLNUM 16 | |
| 652 | |
| 653 /* These should match the first 3 components of PNG_LIBPNG_VER_STRING: */ | |
| 654 #define PNG_LIBPNG_VER_MAJOR 1 | |
| 655 #define PNG_LIBPNG_VER_MINOR 6 | |
| 656 #define PNG_LIBPNG_VER_RELEASE 3 | |
| 657 | |
| 658 /* This should match the numeric part of the final component of | |
| 659 * PNG_LIBPNG_VER_STRING, omitting any leading zero: | |
| 660 */ | |
| 661 | |
| 662 #define PNG_LIBPNG_VER_BUILD 0 | |
| 663 | |
| 664 /* Release Status */ | |
| 665 #define PNG_LIBPNG_BUILD_ALPHA 1 | |
| 666 #define PNG_LIBPNG_BUILD_BETA 2 | |
| 667 #define PNG_LIBPNG_BUILD_RC 3 | |
| 668 #define PNG_LIBPNG_BUILD_STABLE 4 | |
| 669 #define PNG_LIBPNG_BUILD_RELEASE_STATUS_MASK 7 | |
| 670 | |
| 671 /* Release-Specific Flags */ | |
| 672 #define PNG_LIBPNG_BUILD_PATCH 8 /* Can be OR'ed with | |
| 673 PNG_LIBPNG_BUILD_STABLE only */ | |
| 674 #define PNG_LIBPNG_BUILD_PRIVATE 16 /* Cannot be OR'ed with | |
| 675 PNG_LIBPNG_BUILD_SPECIAL */ | |
| 676 #define PNG_LIBPNG_BUILD_SPECIAL 32 /* Cannot be OR'ed with | |
| 677 PNG_LIBPNG_BUILD_PRIVATE */ | |
| 678 | |
| 679 #define PNG_LIBPNG_BUILD_BASE_TYPE PNG_LIBPNG_BUILD_STABLE | |
| 680 | |
| 681 /* Careful here. At one time, Guy wanted to use 082, but that would be octal. | |
| 682 * We must not include leading zeros. | |
| 683 * Versions 0.7 through 1.0.0 were in the range 0 to 100 here (only | |
| 684 * version 1.0.0 was mis-numbered 100 instead of 10000). From | |
| 685 * version 1.0.1 it's xxyyzz, where x=major, y=minor, z=release | |
| 686 */ | |
| 687 #define PNG_LIBPNG_VER 10603 /* 1.6.3 */ | |
| 688 | |
| 689 /* Library configuration: these options cannot be changed after | |
| 690 * the library has been built. | |
| 691 */ | |
| 692 #ifndef PNGLCONF_H | |
| 693 /* If pnglibconf.h is missing, you can | |
| 694 * copy scripts/pnglibconf.h.prebuilt to pnglibconf.h | |
| 695 */ | |
| 696 # include "pnglibconf.h" | |
| 697 #endif | |
| 698 | |
| 699 #ifndef PNG_VERSION_INFO_ONLY | |
| 700 /* Machine specific configuration. */ | |
| 701 # include "pngconf.h" | |
| 702 #endif | |
| 703 | |
| 704 /* | |
| 705 * Added at libpng-1.2.8 | |
| 706 * | |
| 707 * Ref MSDN: Private as priority over Special | |
| 708 * VS_FF_PRIVATEBUILD File *was not* built using standard release | |
| 709 * procedures. If this value is given, the StringFileInfo block must | |
| 710 * contain a PrivateBuild string. | |
| 711 * | |
| 712 * VS_FF_SPECIALBUILD File *was* built by the original company using | |
| 713 * standard release procedures but is a variation of the standard | |
| 714 * file of the same version number. If this value is given, the | |
| 715 * StringFileInfo block must contain a SpecialBuild string. | |
| 716 */ | |
| 717 | |
| 718 #ifdef PNG_USER_PRIVATEBUILD /* From pnglibconf.h */ | |
| 719 # define PNG_LIBPNG_BUILD_TYPE \ | |
| 720 (PNG_LIBPNG_BUILD_BASE_TYPE | PNG_LIBPNG_BUILD_PRIVATE) | |
| 721 #else | |
| 722 # ifdef PNG_LIBPNG_SPECIALBUILD | |
| 723 # define PNG_LIBPNG_BUILD_TYPE \ | |
| 724 (PNG_LIBPNG_BUILD_BASE_TYPE | PNG_LIBPNG_BUILD_SPECIAL) | |
| 725 # else | |
| 726 # define PNG_LIBPNG_BUILD_TYPE (PNG_LIBPNG_BUILD_BASE_TYPE) | |
| 727 # endif | |
| 728 #endif | |
| 729 | |
| 730 #ifndef PNG_VERSION_INFO_ONLY | |
| 731 | |
| 732 /* Inhibit C++ name-mangling for libpng functions but not for system calls. */ | |
| 733 #ifdef __cplusplus | |
| 734 extern "C" { | |
| 735 #endif /* __cplusplus */ | |
| 736 | |
| 737 /* Version information for C files, stored in png.c. This had better match | |
| 738 * the version above. | |
| 739 */ | |
| 740 #define png_libpng_ver png_get_header_ver(NULL) | |
| 741 | |
| 742 /* This file is arranged in several sections: | |
| 743 * | |
| 744 * 1. Any configuration options that can be specified by for the application | |
| 745 * code when it is built. (Build time configuration is in pnglibconf.h) | |
| 746 * 2. Type definitions (base types are defined in pngconf.h), structure | |
| 747 * definitions. | |
| 748 * 3. Exported library functions. | |
| 749 * 4. Simplified API. | |
| 750 * | |
| 751 * The library source code has additional files (principally pngpriv.h) that | |
| 752 * allow configuration of the library. | |
| 753 */ | |
| 754 /* Section 1: run time configuration | |
| 755 * See pnglibconf.h for build time configuration | |
| 756 * | |
| 757 * Run time configuration allows the application to choose between | |
| 758 * implementations of certain arithmetic APIs. The default is set | |
| 759 * at build time and recorded in pnglibconf.h, but it is safe to | |
| 760 * override these (and only these) settings. Note that this won't | |
| 761 * change what the library does, only application code, and the | |
| 762 * settings can (and probably should) be made on a per-file basis | |
| 763 * by setting the #defines before including png.h | |
| 764 * | |
| 765 * Use macros to read integers from PNG data or use the exported | |
| 766 * functions? | |
| 767 * PNG_USE_READ_MACROS: use the macros (see below) Note that | |
| 768 * the macros evaluate their argument multiple times. | |
| 769 * PNG_NO_USE_READ_MACROS: call the relevant library function. | |
| 770 * | |
| 771 * Use the alternative algorithm for compositing alpha samples that | |
| 772 * does not use division? | |
| 773 * PNG_READ_COMPOSITE_NODIV_SUPPORTED: use the 'no division' | |
| 774 * algorithm. | |
| 775 * PNG_NO_READ_COMPOSITE_NODIV: use the 'division' algorithm. | |
| 776 * | |
| 777 * How to handle benign errors if PNG_ALLOW_BENIGN_ERRORS is | |
| 778 * false? | |
| 779 * PNG_ALLOW_BENIGN_ERRORS: map calls to the benign error | |
| 780 * APIs to png_warning. | |
| 781 * Otherwise the calls are mapped to png_error. | |
| 782 */ | |
| 783 | |
| 784 /* Section 2: type definitions, including structures and compile time | |
| 785 * constants. | |
| 786 * See pngconf.h for base types that vary by machine/system | |
| 787 */ | |
| 788 | |
| 789 /* This triggers a compiler error in png.c, if png.c and png.h | |
| 790 * do not agree upon the version number. | |
| 791 */ | |
| 792 typedef char* png_libpng_version_1_6_3; | |
| 793 | |
| 794 /* Basic control structions. Read libpng-manual.txt or libpng.3 for more info. | |
| 795 * | |
| 796 * png_struct is the cache of information used while reading or writing a single | |
| 797 * PNG file. One of these is always required, although the simplified API | |
| 798 * (below) hides the creation and destruction of it. | |
| 799 */ | |
| 800 typedef struct png_struct_def png_struct; | |
| 801 typedef const png_struct * png_const_structp; | |
| 802 typedef png_struct * png_structp; | |
| 803 typedef png_struct * * png_structpp; | |
| 804 | |
| 805 /* png_info contains information read from or to be written to a PNG file. One | |
| 806 * or more of these must exist while reading or creating a PNG file. The | |
| 807 * information is not used by libpng during read but is used to control what | |
| 808 * gets written when a PNG file is created. "png_get_" function calls read | |
| 809 * information during read and "png_set_" functions calls write information | |
| 810 * when creating a PNG. | |
| 811 * been moved into a separate header file that is not accessible to | |
| 812 * applications. Read libpng-manual.txt or libpng.3 for more info. | |
| 813 */ | |
| 814 typedef struct png_info_def png_info; | |
| 815 typedef png_info * png_infop; | |
| 816 typedef const png_info * png_const_infop; | |
| 817 typedef png_info * * png_infopp; | |
| 818 | |
| 819 /* Types with names ending 'p' are pointer types. The corresponding types with | |
| 820 * names ending 'rp' are identical pointer types except that the pointer is | |
| 821 * marked 'restrict', which means that it is the only pointer to the object | |
| 822 * passed to the function. Applications should not use the 'restrict' types; | |
| 823 * it is always valid to pass 'p' to a pointer with a function argument of the | |
| 824 * corresponding 'rp' type. Different compilers have different rules with | |
| 825 * regard to type matching in the presence of 'restrict'. For backward | |
| 826 * compatibility libpng callbacks never have 'restrict' in their parameters and, | |
| 827 * consequentially, writing portable application code is extremely difficult if | |
| 828 * an attempt is made to use 'restrict'. | |
| 829 */ | |
| 830 typedef png_struct * PNG_RESTRICT png_structrp; | |
| 831 typedef const png_struct * PNG_RESTRICT png_const_structrp; | |
| 832 typedef png_info * PNG_RESTRICT png_inforp; | |
| 833 typedef const png_info * PNG_RESTRICT png_const_inforp; | |
| 834 | |
| 835 /* Three color definitions. The order of the red, green, and blue, (and the | |
| 836 * exact size) is not important, although the size of the fields need to | |
| 837 * be png_byte or png_uint_16 (as defined below). | |
| 838 */ | |
| 839 typedef struct png_color_struct | |
| 840 { | |
| 841 png_byte red; | |
| 842 png_byte green; | |
| 843 png_byte blue; | |
| 844 } png_color; | |
| 845 typedef png_color * png_colorp; | |
| 846 typedef const png_color * png_const_colorp; | |
| 847 typedef png_color * * png_colorpp; | |
| 848 | |
| 849 typedef struct png_color_16_struct | |
| 850 { | |
| 851 png_byte index; /* used for palette files */ | |
| 852 png_uint_16 red; /* for use in red green blue files */ | |
| 853 png_uint_16 green; | |
| 854 png_uint_16 blue; | |
| 855 png_uint_16 gray; /* for use in grayscale files */ | |
| 856 } png_color_16; | |
| 857 typedef png_color_16 * png_color_16p; | |
| 858 typedef const png_color_16 * png_const_color_16p; | |
| 859 typedef png_color_16 * * png_color_16pp; | |
| 860 | |
| 861 typedef struct png_color_8_struct | |
| 862 { | |
| 863 png_byte red; /* for use in red green blue files */ | |
| 864 png_byte green; | |
| 865 png_byte blue; | |
| 866 png_byte gray; /* for use in grayscale files */ | |
| 867 png_byte alpha; /* for alpha channel files */ | |
| 868 } png_color_8; | |
| 869 typedef png_color_8 * png_color_8p; | |
| 870 typedef const png_color_8 * png_const_color_8p; | |
| 871 typedef png_color_8 * * png_color_8pp; | |
| 872 | |
| 873 /* | |
| 874 * The following two structures are used for the in-core representation | |
| 875 * of sPLT chunks. | |
| 876 */ | |
| 877 typedef struct png_sPLT_entry_struct | |
| 878 { | |
| 879 png_uint_16 red; | |
| 880 png_uint_16 green; | |
| 881 png_uint_16 blue; | |
| 882 png_uint_16 alpha; | |
| 883 png_uint_16 frequency; | |
| 884 } png_sPLT_entry; | |
| 885 typedef png_sPLT_entry * png_sPLT_entryp; | |
| 886 typedef const png_sPLT_entry * png_const_sPLT_entryp; | |
| 887 typedef png_sPLT_entry * * png_sPLT_entrypp; | |
| 888 | |
| 889 /* When the depth of the sPLT palette is 8 bits, the color and alpha samples | |
| 890 * occupy the LSB of their respective members, and the MSB of each member | |
| 891 * is zero-filled. The frequency member always occupies the full 16 bits. | |
| 892 */ | |
| 893 | |
| 894 typedef struct png_sPLT_struct | |
| 895 { | |
| 896 png_charp name; /* palette name */ | |
| 897 png_byte depth; /* depth of palette samples */ | |
| 898 png_sPLT_entryp entries; /* palette entries */ | |
| 899 png_int_32 nentries; /* number of palette entries */ | |
| 900 } png_sPLT_t; | |
| 901 typedef png_sPLT_t * png_sPLT_tp; | |
| 902 typedef const png_sPLT_t * png_const_sPLT_tp; | |
| 903 typedef png_sPLT_t * * png_sPLT_tpp; | |
| 904 | |
| 905 #ifdef PNG_TEXT_SUPPORTED | |
| 906 /* png_text holds the contents of a text/ztxt/itxt chunk in a PNG file, | |
| 907 * and whether that contents is compressed or not. The "key" field | |
| 908 * points to a regular zero-terminated C string. The "text" fields can be a | |
| 909 * regular C string, an empty string, or a NULL pointer. | |
| 910 * However, the structure returned by png_get_text() will always contain | |
| 911 * the "text" field as a regular zero-terminated C string (possibly | |
| 912 * empty), never a NULL pointer, so it can be safely used in printf() and | |
| 913 * other string-handling functions. Note that the "itxt_length", "lang", and | |
| 914 * "lang_key" members of the structure only exist when the library is built | |
| 915 * with iTXt chunk support. Prior to libpng-1.4.0 the library was built by | |
| 916 * default without iTXt support. Also note that when iTXt *is* supported, | |
| 917 * the "lang" and "lang_key" fields contain NULL pointers when the | |
| 918 * "compression" field contains * PNG_TEXT_COMPRESSION_NONE or | |
| 919 * PNG_TEXT_COMPRESSION_zTXt. Note that the "compression value" is not the | |
| 920 * same as what appears in the PNG tEXt/zTXt/iTXt chunk's "compression flag" | |
| 921 * which is always 0 or 1, or its "compression method" which is always 0. | |
| 922 */ | |
| 923 typedef struct png_text_struct | |
| 924 { | |
| 925 int compression; /* compression value: | |
| 926 -1: tEXt, none | |
| 927 0: zTXt, deflate | |
| 928 1: iTXt, none | |
| 929 2: iTXt, deflate */ | |
| 930 png_charp key; /* keyword, 1-79 character description of "text" */ | |
| 931 png_charp text; /* comment, may be an empty string (ie "") | |
| 932 or a NULL pointer */ | |
| 933 png_size_t text_length; /* length of the text string */ | |
| 934 png_size_t itxt_length; /* length of the itxt string */ | |
| 935 png_charp lang; /* language code, 0-79 characters | |
| 936 or a NULL pointer */ | |
| 937 png_charp lang_key; /* keyword translated UTF-8 string, 0 or more | |
| 938 chars or a NULL pointer */ | |
| 939 } png_text; | |
| 940 typedef png_text * png_textp; | |
| 941 typedef const png_text * png_const_textp; | |
| 942 typedef png_text * * png_textpp; | |
| 943 #endif | |
| 944 | |
| 945 /* Supported compression types for text in PNG files (tEXt, and zTXt). | |
| 946 * The values of the PNG_TEXT_COMPRESSION_ defines should NOT be changed. */ | |
| 947 #define PNG_TEXT_COMPRESSION_NONE_WR -3 | |
| 948 #define PNG_TEXT_COMPRESSION_zTXt_WR -2 | |
| 949 #define PNG_TEXT_COMPRESSION_NONE -1 | |
| 950 #define PNG_TEXT_COMPRESSION_zTXt 0 | |
| 951 #define PNG_ITXT_COMPRESSION_NONE 1 | |
| 952 #define PNG_ITXT_COMPRESSION_zTXt 2 | |
| 953 #define PNG_TEXT_COMPRESSION_LAST 3 /* Not a valid value */ | |
| 954 | |
| 955 /* png_time is a way to hold the time in an machine independent way. | |
| 956 * Two conversions are provided, both from time_t and struct tm. There | |
| 957 * is no portable way to convert to either of these structures, as far | |
| 958 * as I know. If you know of a portable way, send it to me. As a side | |
| 959 * note - PNG has always been Year 2000 compliant! | |
| 960 */ | |
| 961 typedef struct png_time_struct | |
| 962 { | |
| 963 png_uint_16 year; /* full year, as in, 1995 */ | |
| 964 png_byte month; /* month of year, 1 - 12 */ | |
| 965 png_byte day; /* day of month, 1 - 31 */ | |
| 966 png_byte hour; /* hour of day, 0 - 23 */ | |
| 967 png_byte minute; /* minute of hour, 0 - 59 */ | |
| 968 png_byte second; /* second of minute, 0 - 60 (for leap seconds) */ | |
| 969 } png_time; | |
| 970 typedef png_time * png_timep; | |
| 971 typedef const png_time * png_const_timep; | |
| 972 typedef png_time * * png_timepp; | |
| 973 | |
| 974 #ifdef PNG_STORE_UNKNOWN_CHUNKS_SUPPORTED | |
| 975 /* png_unknown_chunk is a structure to hold queued chunks for which there is | |
| 976 * no specific support. The idea is that we can use this to queue | |
| 977 * up private chunks for output even though the library doesn't actually | |
| 978 * know about their semantics. | |
| 979 * | |
| 980 * The data in the structure is set by libpng on read and used on write. | |
| 981 */ | |
| 982 typedef struct png_unknown_chunk_t | |
| 983 { | |
| 984 png_byte name[5]; /* Textual chunk name with '\0' terminator */ | |
| 985 png_byte *data; /* Data, should not be modified on read! */ | |
| 986 png_size_t size; | |
| 987 | |
| 988 /* On write 'location' must be set using the flag values listed below. | |
| 989 * Notice that on read it is set by libpng however the values stored have | |
| 990 * more bits set than are listed below. Always treat the value as a | |
| 991 * bitmask. On write set only one bit - setting multiple bits may cause the | |
| 992 * chunk to be written in multiple places. | |
| 993 */ | |
| 994 png_byte location; /* mode of operation at read time */ | |
| 995 } | |
| 996 png_unknown_chunk; | |
| 997 | |
| 998 typedef png_unknown_chunk * png_unknown_chunkp; | |
| 999 typedef const png_unknown_chunk * png_const_unknown_chunkp; | |
| 1000 typedef png_unknown_chunk * * png_unknown_chunkpp; | |
| 1001 #endif | |
| 1002 | |
| 1003 /* Flag values for the unknown chunk location byte. */ | |
| 1004 #define PNG_HAVE_IHDR 0x01 | |
| 1005 #define PNG_HAVE_PLTE 0x02 | |
| 1006 #define PNG_AFTER_IDAT 0x08 | |
| 1007 | |
| 1008 /* Maximum positive integer used in PNG is (2^31)-1 */ | |
| 1009 #define PNG_UINT_31_MAX ((png_uint_32)0x7fffffffL) | |
| 1010 #define PNG_UINT_32_MAX ((png_uint_32)(-1)) | |
| 1011 #define PNG_SIZE_MAX ((png_size_t)(-1)) | |
| 1012 | |
| 1013 /* These are constants for fixed point values encoded in the | |
| 1014 * PNG specification manner (x100000) | |
| 1015 */ | |
| 1016 #define PNG_FP_1 100000 | |
| 1017 #define PNG_FP_HALF 50000 | |
| 1018 #define PNG_FP_MAX ((png_fixed_point)0x7fffffffL) | |
| 1019 #define PNG_FP_MIN (-PNG_FP_MAX) | |
| 1020 | |
| 1021 /* These describe the color_type field in png_info. */ | |
| 1022 /* color type masks */ | |
| 1023 #define PNG_COLOR_MASK_PALETTE 1 | |
| 1024 #define PNG_COLOR_MASK_COLOR 2 | |
| 1025 #define PNG_COLOR_MASK_ALPHA 4 | |
| 1026 | |
| 1027 /* color types. Note that not all combinations are legal */ | |
| 1028 #define PNG_COLOR_TYPE_GRAY 0 | |
| 1029 #define PNG_COLOR_TYPE_PALETTE (PNG_COLOR_MASK_COLOR | PNG_COLOR_MASK_PALETTE) | |
| 1030 #define PNG_COLOR_TYPE_RGB (PNG_COLOR_MASK_COLOR) | |
| 1031 #define PNG_COLOR_TYPE_RGB_ALPHA (PNG_COLOR_MASK_COLOR | PNG_COLOR_MASK_ALPHA) | |
| 1032 #define PNG_COLOR_TYPE_GRAY_ALPHA (PNG_COLOR_MASK_ALPHA) | |
| 1033 /* aliases */ | |
| 1034 #define PNG_COLOR_TYPE_RGBA PNG_COLOR_TYPE_RGB_ALPHA | |
| 1035 #define PNG_COLOR_TYPE_GA PNG_COLOR_TYPE_GRAY_ALPHA | |
| 1036 | |
| 1037 /* This is for compression type. PNG 1.0-1.2 only define the single type. */ | |
| 1038 #define PNG_COMPRESSION_TYPE_BASE 0 /* Deflate method 8, 32K window */ | |
| 1039 #define PNG_COMPRESSION_TYPE_DEFAULT PNG_COMPRESSION_TYPE_BASE | |
| 1040 | |
| 1041 /* This is for filter type. PNG 1.0-1.2 only define the single type. */ | |
| 1042 #define PNG_FILTER_TYPE_BASE 0 /* Single row per-byte filtering */ | |
| 1043 #define PNG_INTRAPIXEL_DIFFERENCING 64 /* Used only in MNG datastreams */ | |
| 1044 #define PNG_FILTER_TYPE_DEFAULT PNG_FILTER_TYPE_BASE | |
| 1045 | |
| 1046 /* These are for the interlacing type. These values should NOT be changed. */ | |
| 1047 #define PNG_INTERLACE_NONE 0 /* Non-interlaced image */ | |
| 1048 #define PNG_INTERLACE_ADAM7 1 /* Adam7 interlacing */ | |
| 1049 #define PNG_INTERLACE_LAST 2 /* Not a valid value */ | |
| 1050 | |
| 1051 /* These are for the oFFs chunk. These values should NOT be changed. */ | |
| 1052 #define PNG_OFFSET_PIXEL 0 /* Offset in pixels */ | |
| 1053 #define PNG_OFFSET_MICROMETER 1 /* Offset in micrometers (1/10^6 meter) */ | |
| 1054 #define PNG_OFFSET_LAST 2 /* Not a valid value */ | |
| 1055 | |
| 1056 /* These are for the pCAL chunk. These values should NOT be changed. */ | |
| 1057 #define PNG_EQUATION_LINEAR 0 /* Linear transformation */ | |
| 1058 #define PNG_EQUATION_BASE_E 1 /* Exponential base e transform */ | |
| 1059 #define PNG_EQUATION_ARBITRARY 2 /* Arbitrary base exponential transform */ | |
| 1060 #define PNG_EQUATION_HYPERBOLIC 3 /* Hyperbolic sine transformation */ | |
| 1061 #define PNG_EQUATION_LAST 4 /* Not a valid value */ | |
| 1062 | |
| 1063 /* These are for the sCAL chunk. These values should NOT be changed. */ | |
| 1064 #define PNG_SCALE_UNKNOWN 0 /* unknown unit (image scale) */ | |
| 1065 #define PNG_SCALE_METER 1 /* meters per pixel */ | |
| 1066 #define PNG_SCALE_RADIAN 2 /* radians per pixel */ | |
| 1067 #define PNG_SCALE_LAST 3 /* Not a valid value */ | |
| 1068 | |
| 1069 /* These are for the pHYs chunk. These values should NOT be changed. */ | |
| 1070 #define PNG_RESOLUTION_UNKNOWN 0 /* pixels/unknown unit (aspect ratio) */ | |
| 1071 #define PNG_RESOLUTION_METER 1 /* pixels/meter */ | |
| 1072 #define PNG_RESOLUTION_LAST 2 /* Not a valid value */ | |
| 1073 | |
| 1074 /* These are for the sRGB chunk. These values should NOT be changed. */ | |
| 1075 #define PNG_sRGB_INTENT_PERCEPTUAL 0 | |
| 1076 #define PNG_sRGB_INTENT_RELATIVE 1 | |
| 1077 #define PNG_sRGB_INTENT_SATURATION 2 | |
| 1078 #define PNG_sRGB_INTENT_ABSOLUTE 3 | |
| 1079 #define PNG_sRGB_INTENT_LAST 4 /* Not a valid value */ | |
| 1080 | |
| 1081 /* This is for text chunks */ | |
| 1082 #define PNG_KEYWORD_MAX_LENGTH 79 | |
| 1083 | |
| 1084 /* Maximum number of entries in PLTE/sPLT/tRNS arrays */ | |
| 1085 #define PNG_MAX_PALETTE_LENGTH 256 | |
| 1086 | |
| 1087 /* These determine if an ancillary chunk's data has been successfully read | |
| 1088 * from the PNG header, or if the application has filled in the corresponding | |
| 1089 * data in the info_struct to be written into the output file. The values | |
| 1090 * of the PNG_INFO_<chunk> defines should NOT be changed. | |
| 1091 */ | |
| 1092 #define PNG_INFO_gAMA 0x0001 | |
| 1093 #define PNG_INFO_sBIT 0x0002 | |
| 1094 #define PNG_INFO_cHRM 0x0004 | |
| 1095 #define PNG_INFO_PLTE 0x0008 | |
| 1096 #define PNG_INFO_tRNS 0x0010 | |
| 1097 #define PNG_INFO_bKGD 0x0020 | |
| 1098 #define PNG_INFO_hIST 0x0040 | |
| 1099 #define PNG_INFO_pHYs 0x0080 | |
| 1100 #define PNG_INFO_oFFs 0x0100 | |
| 1101 #define PNG_INFO_tIME 0x0200 | |
| 1102 #define PNG_INFO_pCAL 0x0400 | |
| 1103 #define PNG_INFO_sRGB 0x0800 /* GR-P, 0.96a */ | |
| 1104 #define PNG_INFO_iCCP 0x1000 /* ESR, 1.0.6 */ | |
| 1105 #define PNG_INFO_sPLT 0x2000 /* ESR, 1.0.6 */ | |
| 1106 #define PNG_INFO_sCAL 0x4000 /* ESR, 1.0.6 */ | |
| 1107 #define PNG_INFO_IDAT 0x8000 /* ESR, 1.0.6 */ | |
| 1108 | |
| 1109 /* This is used for the transformation routines, as some of them | |
| 1110 * change these values for the row. It also should enable using | |
| 1111 * the routines for other purposes. | |
| 1112 */ | |
| 1113 typedef struct png_row_info_struct | |
| 1114 { | |
| 1115 png_uint_32 width; /* width of row */ | |
| 1116 png_size_t rowbytes; /* number of bytes in row */ | |
| 1117 png_byte color_type; /* color type of row */ | |
| 1118 png_byte bit_depth; /* bit depth of row */ | |
| 1119 png_byte channels; /* number of channels (1, 2, 3, or 4) */ | |
| 1120 png_byte pixel_depth; /* bits per pixel (depth * channels) */ | |
| 1121 } png_row_info; | |
| 1122 | |
| 1123 typedef png_row_info * png_row_infop; | |
| 1124 typedef png_row_info * * png_row_infopp; | |
| 1125 | |
| 1126 /* These are the function types for the I/O functions and for the functions | |
| 1127 * that allow the user to override the default I/O functions with his or her | |
| 1128 * own. The png_error_ptr type should match that of user-supplied warning | |
| 1129 * and error functions, while the png_rw_ptr type should match that of the | |
| 1130 * user read/write data functions. Note that the 'write' function must not | |
| 1131 * modify the buffer it is passed. The 'read' function, on the other hand, is | |
| 1132 * expected to return the read data in the buffer. | |
| 1133 */ | |
| 1134 typedef PNG_CALLBACK(void, *png_error_ptr, (png_structp, png_const_charp)); | |
| 1135 typedef PNG_CALLBACK(void, *png_rw_ptr, (png_structp, png_bytep, png_size_t)); | |
| 1136 typedef PNG_CALLBACK(void, *png_flush_ptr, (png_structp)); | |
| 1137 typedef PNG_CALLBACK(void, *png_read_status_ptr, (png_structp, png_uint_32, | |
| 1138 int)); | |
| 1139 typedef PNG_CALLBACK(void, *png_write_status_ptr, (png_structp, png_uint_32, | |
| 1140 int)); | |
| 1141 | |
| 1142 #ifdef PNG_PROGRESSIVE_READ_SUPPORTED | |
| 1143 typedef PNG_CALLBACK(void, *png_progressive_info_ptr, (png_structp, png_infop)); | |
| 1144 typedef PNG_CALLBACK(void, *png_progressive_end_ptr, (png_structp, png_infop)); | |
| 1145 | |
| 1146 /* The following callback receives png_uint_32 row_number, int pass for the | |
| 1147 * png_bytep data of the row. When transforming an interlaced image the | |
| 1148 * row number is the row number within the sub-image of the interlace pass, so | |
| 1149 * the value will increase to the height of the sub-image (not the full image) | |
| 1150 * then reset to 0 for the next pass. | |
| 1151 * | |
| 1152 * Use PNG_ROW_FROM_PASS_ROW(row, pass) and PNG_COL_FROM_PASS_COL(col, pass) to | |
| 1153 * find the output pixel (x,y) given an interlaced sub-image pixel | |
| 1154 * (row,col,pass). (See below for these macros.) | |
| 1155 */ | |
| 1156 typedef PNG_CALLBACK(void, *png_progressive_row_ptr, (png_structp, png_bytep, | |
| 1157 png_uint_32, int)); | |
| 1158 #endif | |
| 1159 | |
| 1160 #if defined(PNG_READ_USER_TRANSFORM_SUPPORTED) || \ | |
| 1161 defined(PNG_WRITE_USER_TRANSFORM_SUPPORTED) | |
| 1162 typedef PNG_CALLBACK(void, *png_user_transform_ptr, (png_structp, png_row_infop, | |
| 1163 png_bytep)); | |
| 1164 #endif | |
| 1165 | |
| 1166 #ifdef PNG_USER_CHUNKS_SUPPORTED | |
| 1167 typedef PNG_CALLBACK(int, *png_user_chunk_ptr, (png_structp, | |
| 1168 png_unknown_chunkp)); | |
| 1169 #endif | |
| 1170 #ifdef PNG_UNKNOWN_CHUNKS_SUPPORTED | |
| 1171 /* not used anywhere */ | |
| 1172 /* typedef PNG_CALLBACK(void, *png_unknown_chunk_ptr, (png_structp)); */ | |
| 1173 #endif | |
| 1174 | |
| 1175 #ifdef PNG_SETJMP_SUPPORTED | |
| 1176 /* This must match the function definition in <setjmp.h>, and the application | |
| 1177 * must include this before png.h to obtain the definition of jmp_buf. The | |
| 1178 * function is required to be PNG_NORETURN, but this is not checked. If the | |
| 1179 * function does return the application will crash via an abort() or similar | |
| 1180 * system level call. | |
| 1181 * | |
| 1182 * If you get a warning here while building the library you may need to make | |
| 1183 * changes to ensure that pnglibconf.h records the calling convention used by | |
| 1184 * your compiler. This may be very difficult - try using a different compiler | |
| 1185 * to build the library! | |
| 1186 */ | |
| 1187 PNG_FUNCTION(void, (PNGCAPI *png_longjmp_ptr), PNGARG((jmp_buf, int)), typedef); | |
| 1188 #endif | |
| 1189 | |
| 1190 /* Transform masks for the high-level interface */ | |
| 1191 #define PNG_TRANSFORM_IDENTITY 0x0000 /* read and write */ | |
| 1192 #define PNG_TRANSFORM_STRIP_16 0x0001 /* read only */ | |
| 1193 #define PNG_TRANSFORM_STRIP_ALPHA 0x0002 /* read only */ | |
| 1194 #define PNG_TRANSFORM_PACKING 0x0004 /* read and write */ | |
| 1195 #define PNG_TRANSFORM_PACKSWAP 0x0008 /* read and write */ | |
| 1196 #define PNG_TRANSFORM_EXPAND 0x0010 /* read only */ | |
| 1197 #define PNG_TRANSFORM_INVERT_MONO 0x0020 /* read and write */ | |
| 1198 #define PNG_TRANSFORM_SHIFT 0x0040 /* read and write */ | |
| 1199 #define PNG_TRANSFORM_BGR 0x0080 /* read and write */ | |
| 1200 #define PNG_TRANSFORM_SWAP_ALPHA 0x0100 /* read and write */ | |
| 1201 #define PNG_TRANSFORM_SWAP_ENDIAN 0x0200 /* read and write */ | |
| 1202 #define PNG_TRANSFORM_INVERT_ALPHA 0x0400 /* read and write */ | |
| 1203 #define PNG_TRANSFORM_STRIP_FILLER 0x0800 /* write only */ | |
| 1204 /* Added to libpng-1.2.34 */ | |
| 1205 #define PNG_TRANSFORM_STRIP_FILLER_BEFORE PNG_TRANSFORM_STRIP_FILLER | |
| 1206 #define PNG_TRANSFORM_STRIP_FILLER_AFTER 0x1000 /* write only */ | |
| 1207 /* Added to libpng-1.4.0 */ | |
| 1208 #define PNG_TRANSFORM_GRAY_TO_RGB 0x2000 /* read only */ | |
| 1209 /* Added to libpng-1.5.4 */ | |
| 1210 #define PNG_TRANSFORM_EXPAND_16 0x4000 /* read only */ | |
| 1211 #define PNG_TRANSFORM_SCALE_16 0x8000 /* read only */ | |
| 1212 | |
| 1213 /* Flags for MNG supported features */ | |
| 1214 #define PNG_FLAG_MNG_EMPTY_PLTE 0x01 | |
| 1215 #define PNG_FLAG_MNG_FILTER_64 0x04 | |
| 1216 #define PNG_ALL_MNG_FEATURES 0x05 | |
| 1217 | |
| 1218 /* NOTE: prior to 1.5 these functions had no 'API' style declaration, | |
| 1219 * this allowed the zlib default functions to be used on Windows | |
| 1220 * platforms. In 1.5 the zlib default malloc (which just calls malloc and | |
| 1221 * ignores the first argument) should be completely compatible with the | |
| 1222 * following. | |
| 1223 */ | |
| 1224 typedef PNG_CALLBACK(png_voidp, *png_malloc_ptr, (png_structp, | |
| 1225 png_alloc_size_t)); | |
| 1226 typedef PNG_CALLBACK(void, *png_free_ptr, (png_structp, png_voidp)); | |
| 1227 | |
| 1228 /* Section 3: exported functions | |
| 1229 * Here are the function definitions most commonly used. This is not | |
| 1230 * the place to find out how to use libpng. See libpng-manual.txt for the | |
| 1231 * full explanation, see example.c for the summary. This just provides | |
| 1232 * a simple one line description of the use of each function. | |
| 1233 * | |
| 1234 * The PNG_EXPORT() and PNG_EXPORTA() macros used below are defined in | |
| 1235 * pngconf.h and in the *.dfn files in the scripts directory. | |
| 1236 * | |
| 1237 * PNG_EXPORT(ordinal, type, name, (args)); | |
| 1238 * | |
| 1239 * ordinal: ordinal that is used while building | |
| 1240 * *.def files. The ordinal value is only | |
| 1241 * relevant when preprocessing png.h with | |
| 1242 * the *.dfn files for building symbol table | |
| 1243 * entries, and are removed by pngconf.h. | |
| 1244 * type: return type of the function | |
| 1245 * name: function name | |
| 1246 * args: function arguments, with types | |
| 1247 * | |
| 1248 * When we wish to append attributes to a function prototype we use | |
| 1249 * the PNG_EXPORTA() macro instead. | |
| 1250 * | |
| 1251 * PNG_EXPORTA(ordinal, type, name, (args), attributes); | |
| 1252 * | |
| 1253 * ordinal, type, name, and args: same as in PNG_EXPORT(). | |
| 1254 * attributes: function attributes | |
| 1255 */ | |
| 1256 | |
| 1257 /* Returns the version number of the library */ | |
| 1258 PNG_EXPORT(1, png_uint_32, png_access_version_number, (void)); | |
| 1259 | |
| 1260 /* Tell lib we have already handled the first <num_bytes> magic bytes. | |
| 1261 * Handling more than 8 bytes from the beginning of the file is an error. | |
| 1262 */ | |
| 1263 PNG_EXPORT(2, void, png_set_sig_bytes, (png_structrp png_ptr, int num_bytes)); | |
| 1264 | |
| 1265 /* Check sig[start] through sig[start + num_to_check - 1] to see if it's a | |
| 1266 * PNG file. Returns zero if the supplied bytes match the 8-byte PNG | |
| 1267 * signature, and non-zero otherwise. Having num_to_check == 0 or | |
| 1268 * start > 7 will always fail (ie return non-zero). | |
| 1269 */ | |
| 1270 PNG_EXPORT(3, int, png_sig_cmp, (png_const_bytep sig, png_size_t start, | |
| 1271 png_size_t num_to_check)); | |
| 1272 | |
| 1273 /* Simple signature checking function. This is the same as calling | |
| 1274 * png_check_sig(sig, n) := !png_sig_cmp(sig, 0, n). | |
| 1275 */ | |
| 1276 #define png_check_sig(sig, n) !png_sig_cmp((sig), 0, (n)) | |
| 1277 | |
| 1278 /* Allocate and initialize png_ptr struct for reading, and any other memory. */ | |
| 1279 PNG_EXPORTA(4, png_structp, png_create_read_struct, | |
| 1280 (png_const_charp user_png_ver, png_voidp error_ptr, | |
| 1281 png_error_ptr error_fn, png_error_ptr warn_fn), | |
| 1282 PNG_ALLOCATED); | |
| 1283 | |
| 1284 /* Allocate and initialize png_ptr struct for writing, and any other memory */ | |
| 1285 PNG_EXPORTA(5, png_structp, png_create_write_struct, | |
| 1286 (png_const_charp user_png_ver, png_voidp error_ptr, png_error_ptr error_fn, | |
| 1287 png_error_ptr warn_fn), | |
| 1288 PNG_ALLOCATED); | |
| 1289 | |
| 1290 PNG_EXPORT(6, png_size_t, png_get_compression_buffer_size, | |
| 1291 (png_const_structrp png_ptr)); | |
| 1292 | |
| 1293 PNG_EXPORT(7, void, png_set_compression_buffer_size, (png_structrp png_ptr, | |
| 1294 png_size_t size)); | |
| 1295 | |
| 1296 /* Moved from pngconf.h in 1.4.0 and modified to ensure setjmp/longjmp | |
| 1297 * match up. | |
| 1298 */ | |
| 1299 #ifdef PNG_SETJMP_SUPPORTED | |
| 1300 /* This function returns the jmp_buf built in to *png_ptr. It must be | |
| 1301 * supplied with an appropriate 'longjmp' function to use on that jmp_buf | |
| 1302 * unless the default error function is overridden in which case NULL is | |
| 1303 * acceptable. The size of the jmp_buf is checked against the actual size | |
| 1304 * allocated by the library - the call will return NULL on a mismatch | |
| 1305 * indicating an ABI mismatch. | |
| 1306 */ | |
| 1307 PNG_EXPORT(8, jmp_buf*, png_set_longjmp_fn, (png_structrp png_ptr, | |
| 1308 png_longjmp_ptr longjmp_fn, size_t jmp_buf_size)); | |
| 1309 # define png_jmpbuf(png_ptr) \ | |
| 1310 (*png_set_longjmp_fn((png_ptr), longjmp, (sizeof (jmp_buf)))) | |
| 1311 #else | |
| 1312 # define png_jmpbuf(png_ptr) \ | |
| 1313 (LIBPNG_WAS_COMPILED_WITH__PNG_NO_SETJMP) | |
| 1314 #endif | |
| 1315 /* This function should be used by libpng applications in place of | |
| 1316 * longjmp(png_ptr->jmpbuf, val). If longjmp_fn() has been set, it | |
| 1317 * will use it; otherwise it will call PNG_ABORT(). This function was | |
| 1318 * added in libpng-1.5.0. | |
| 1319 */ | |
| 1320 PNG_EXPORTA(9, void, png_longjmp, (png_const_structrp png_ptr, int val), | |
| 1321 PNG_NORETURN); | |
| 1322 | |
| 1323 #ifdef PNG_READ_SUPPORTED | |
| 1324 /* Reset the compression stream */ | |
| 1325 PNG_EXPORTA(10, int, png_reset_zstream, (png_structrp png_ptr), PNG_DEPRECATED); | |
| 1326 #endif | |
| 1327 | |
| 1328 /* New functions added in libpng-1.0.2 (not enabled by default until 1.2.0) */ | |
| 1329 #ifdef PNG_USER_MEM_SUPPORTED | |
| 1330 PNG_EXPORTA(11, png_structp, png_create_read_struct_2, | |
| 1331 (png_const_charp user_png_ver, png_voidp error_ptr, png_error_ptr error_fn, | |
| 1332 png_error_ptr warn_fn, | |
| 1333 png_voidp mem_ptr, png_malloc_ptr malloc_fn, png_free_ptr free_fn), | |
| 1334 PNG_ALLOCATED); | |
| 1335 PNG_EXPORTA(12, png_structp, png_create_write_struct_2, | |
| 1336 (png_const_charp user_png_ver, png_voidp error_ptr, png_error_ptr error_fn, | |
| 1337 png_error_ptr warn_fn, | |
| 1338 png_voidp mem_ptr, png_malloc_ptr malloc_fn, png_free_ptr free_fn), | |
| 1339 PNG_ALLOCATED); | |
| 1340 #endif | |
| 1341 | |
| 1342 /* Write the PNG file signature. */ | |
| 1343 PNG_EXPORT(13, void, png_write_sig, (png_structrp png_ptr)); | |
| 1344 | |
| 1345 /* Write a PNG chunk - size, type, (optional) data, CRC. */ | |
| 1346 PNG_EXPORT(14, void, png_write_chunk, (png_structrp png_ptr, png_const_bytep | |
| 1347 chunk_name, png_const_bytep data, png_size_t length)); | |
| 1348 | |
| 1349 /* Write the start of a PNG chunk - length and chunk name. */ | |
| 1350 PNG_EXPORT(15, void, png_write_chunk_start, (png_structrp png_ptr, | |
| 1351 png_const_bytep chunk_name, png_uint_32 length)); | |
| 1352 | |
| 1353 /* Write the data of a PNG chunk started with png_write_chunk_start(). */ | |
| 1354 PNG_EXPORT(16, void, png_write_chunk_data, (png_structrp png_ptr, | |
| 1355 png_const_bytep data, png_size_t length)); | |
| 1356 | |
| 1357 /* Finish a chunk started with png_write_chunk_start() (includes CRC). */ | |
| 1358 PNG_EXPORT(17, void, png_write_chunk_end, (png_structrp png_ptr)); | |
| 1359 | |
| 1360 /* Allocate and initialize the info structure */ | |
| 1361 PNG_EXPORTA(18, png_infop, png_create_info_struct, (png_const_structrp png_ptr), | |
| 1362 PNG_ALLOCATED); | |
| 1363 | |
| 1364 /* DEPRECATED: this function allowed init structures to be created using the | |
| 1365 * default allocation method (typically malloc). Use is deprecated in 1.6.0 and | |
| 1366 * the API will be removed in the future. | |
| 1367 */ | |
| 1368 PNG_EXPORTA(19, void, png_info_init_3, (png_infopp info_ptr, | |
| 1369 png_size_t png_info_struct_size), PNG_DEPRECATED); | |
| 1370 | |
| 1371 /* Writes all the PNG information before the image. */ | |
| 1372 PNG_EXPORT(20, void, png_write_info_before_PLTE, | |
| 1373 (png_structrp png_ptr, png_const_inforp info_ptr)); | |
| 1374 PNG_EXPORT(21, void, png_write_info, | |
| 1375 (png_structrp png_ptr, png_const_inforp info_ptr)); | |
| 1376 | |
| 1377 #ifdef PNG_SEQUENTIAL_READ_SUPPORTED | |
| 1378 /* Read the information before the actual image data. */ | |
| 1379 PNG_EXPORT(22, void, png_read_info, | |
| 1380 (png_structrp png_ptr, png_inforp info_ptr)); | |
| 1381 #endif | |
| 1382 | |
| 1383 #ifdef PNG_TIME_RFC1123_SUPPORTED | |
| 1384 /* Convert to a US string format: there is no localization support in this | |
| 1385 * routine. The original implementation used a 29 character buffer in | |
| 1386 * png_struct, this will be removed in future versions. | |
| 1387 */ | |
| 1388 #if PNG_LIBPNG_VER < 10700 | |
| 1389 /* To do: remove this from libpng17 (and from libpng17/png.c and pngstruct.h) */ | |
| 1390 PNG_EXPORTA(23, png_const_charp, png_convert_to_rfc1123, (png_structrp png_ptr, | |
| 1391 png_const_timep ptime),PNG_DEPRECATED); | |
| 1392 #endif | |
| 1393 PNG_EXPORT(241, int, png_convert_to_rfc1123_buffer, (char out[29], | |
| 1394 png_const_timep ptime)); | |
| 1395 #endif | |
| 1396 | |
| 1397 #ifdef PNG_CONVERT_tIME_SUPPORTED | |
| 1398 /* Convert from a struct tm to png_time */ | |
| 1399 PNG_EXPORT(24, void, png_convert_from_struct_tm, (png_timep ptime, | |
| 1400 const struct tm * ttime)); | |
| 1401 | |
| 1402 /* Convert from time_t to png_time. Uses gmtime() */ | |
| 1403 PNG_EXPORT(25, void, png_convert_from_time_t, (png_timep ptime, time_t ttime)); | |
| 1404 #endif /* PNG_CONVERT_tIME_SUPPORTED */ | |
| 1405 | |
| 1406 #ifdef PNG_READ_EXPAND_SUPPORTED | |
| 1407 /* Expand data to 24-bit RGB, or 8-bit grayscale, with alpha if available. */ | |
| 1408 PNG_EXPORT(26, void, png_set_expand, (png_structrp png_ptr)); | |
| 1409 PNG_EXPORT(27, void, png_set_expand_gray_1_2_4_to_8, (png_structrp png_ptr)); | |
| 1410 PNG_EXPORT(28, void, png_set_palette_to_rgb, (png_structrp png_ptr)); | |
| 1411 PNG_EXPORT(29, void, png_set_tRNS_to_alpha, (png_structrp png_ptr)); | |
| 1412 #endif | |
| 1413 | |
| 1414 #ifdef PNG_READ_EXPAND_16_SUPPORTED | |
| 1415 /* Expand to 16-bit channels, forces conversion of palette to RGB and expansion | |
| 1416 * of a tRNS chunk if present. | |
| 1417 */ | |
| 1418 PNG_EXPORT(221, void, png_set_expand_16, (png_structrp png_ptr)); | |
| 1419 #endif | |
| 1420 | |
| 1421 #if defined(PNG_READ_BGR_SUPPORTED) || defined(PNG_WRITE_BGR_SUPPORTED) | |
| 1422 /* Use blue, green, red order for pixels. */ | |
| 1423 PNG_EXPORT(30, void, png_set_bgr, (png_structrp png_ptr)); | |
| 1424 #endif | |
| 1425 | |
| 1426 #ifdef PNG_READ_GRAY_TO_RGB_SUPPORTED | |
| 1427 /* Expand the grayscale to 24-bit RGB if necessary. */ | |
| 1428 PNG_EXPORT(31, void, png_set_gray_to_rgb, (png_structrp png_ptr)); | |
| 1429 #endif | |
| 1430 | |
| 1431 #ifdef PNG_READ_RGB_TO_GRAY_SUPPORTED | |
| 1432 /* Reduce RGB to grayscale. */ | |
| 1433 #define PNG_ERROR_ACTION_NONE 1 | |
| 1434 #define PNG_ERROR_ACTION_WARN 2 | |
| 1435 #define PNG_ERROR_ACTION_ERROR 3 | |
| 1436 #define PNG_RGB_TO_GRAY_DEFAULT (-1)/*for red/green coefficients*/ | |
| 1437 | |
| 1438 PNG_FP_EXPORT(32, void, png_set_rgb_to_gray, (png_structrp png_ptr, | |
| 1439 int error_action, double red, double green)) | |
| 1440 PNG_FIXED_EXPORT(33, void, png_set_rgb_to_gray_fixed, (png_structrp png_ptr, | |
| 1441 int error_action, png_fixed_point red, png_fixed_point green)) | |
| 1442 | |
| 1443 PNG_EXPORT(34, png_byte, png_get_rgb_to_gray_status, (png_const_structrp | |
| 1444 png_ptr)); | |
| 1445 #endif | |
| 1446 | |
| 1447 #ifdef PNG_BUILD_GRAYSCALE_PALETTE_SUPPORTED | |
| 1448 PNG_EXPORT(35, void, png_build_grayscale_palette, (int bit_depth, | |
| 1449 png_colorp palette)); | |
| 1450 #endif | |
| 1451 | |
| 1452 #ifdef PNG_READ_ALPHA_MODE_SUPPORTED | |
| 1453 /* How the alpha channel is interpreted - this affects how the color channels of | |
| 1454 * a PNG file are returned when an alpha channel, or tRNS chunk in a palette | |
| 1455 * file, is present. | |
| 1456 * | |
| 1457 * This has no effect on the way pixels are written into a PNG output | |
| 1458 * datastream. The color samples in a PNG datastream are never premultiplied | |
| 1459 * with the alpha samples. | |
| 1460 * | |
| 1461 * The default is to return data according to the PNG specification: the alpha | |
| 1462 * channel is a linear measure of the contribution of the pixel to the | |
| 1463 * corresponding composited pixel. The gamma encoded color channels must be | |
| 1464 * scaled according to the contribution and to do this it is necessary to undo | |
| 1465 * the encoding, scale the color values, perform the composition and reencode | |
| 1466 * the values. This is the 'PNG' mode. | |
| 1467 * | |
| 1468 * The alternative is to 'associate' the alpha with the color information by | |
| 1469 * storing color channel values that have been scaled by the alpha. The | |
| 1470 * advantage is that the color channels can be resampled (the image can be | |
| 1471 * scaled) in this form. The disadvantage is that normal practice is to store | |
| 1472 * linear, not (gamma) encoded, values and this requires 16-bit channels for | |
| 1473 * still images rather than the 8-bit channels that are just about sufficient if | |
| 1474 * gamma encoding is used. In addition all non-transparent pixel values, | |
| 1475 * including completely opaque ones, must be gamma encoded to produce the final | |
| 1476 * image. This is the 'STANDARD', 'ASSOCIATED' or 'PREMULTIPLIED' mode (the | |
| 1477 * latter being the two common names for associated alpha color channels.) | |
| 1478 * | |
| 1479 * Since it is not necessary to perform arithmetic on opaque color values so | |
| 1480 * long as they are not to be resampled and are in the final color space it is | |
| 1481 * possible to optimize the handling of alpha by storing the opaque pixels in | |
| 1482 * the PNG format (adjusted for the output color space) while storing partially | |
| 1483 * opaque pixels in the standard, linear, format. The accuracy required for | |
| 1484 * standard alpha composition is relatively low, because the pixels are | |
| 1485 * isolated, therefore typically the accuracy loss in storing 8-bit linear | |
| 1486 * values is acceptable. (This is not true if the alpha channel is used to | |
| 1487 * simulate transparency over large areas - use 16 bits or the PNG mode in | |
| 1488 * this case!) This is the 'OPTIMIZED' mode. For this mode a pixel is | |
| 1489 * treated as opaque only if the alpha value is equal to the maximum value. | |
| 1490 * | |
| 1491 * The final choice is to gamma encode the alpha channel as well. This is | |
| 1492 * broken because, in practice, no implementation that uses this choice | |
| 1493 * correctly undoes the encoding before handling alpha composition. Use this | |
| 1494 * choice only if other serious errors in the software or hardware you use | |
| 1495 * mandate it; the typical serious error is for dark halos to appear around | |
| 1496 * opaque areas of the composited PNG image because of arithmetic overflow. | |
| 1497 * | |
| 1498 * The API function png_set_alpha_mode specifies which of these choices to use | |
| 1499 * with an enumerated 'mode' value and the gamma of the required output: | |
| 1500 */ | |
| 1501 #define PNG_ALPHA_PNG 0 /* according to the PNG standard */ | |
| 1502 #define PNG_ALPHA_STANDARD 1 /* according to Porter/Duff */ | |
| 1503 #define PNG_ALPHA_ASSOCIATED 1 /* as above; this is the normal practice */ | |
| 1504 #define PNG_ALPHA_PREMULTIPLIED 1 /* as above */ | |
| 1505 #define PNG_ALPHA_OPTIMIZED 2 /* 'PNG' for opaque pixels, else 'STANDARD' */ | |
| 1506 #define PNG_ALPHA_BROKEN 3 /* the alpha channel is gamma encoded */ | |
| 1507 | |
| 1508 PNG_FP_EXPORT(227, void, png_set_alpha_mode, (png_structrp png_ptr, int mode, | |
| 1509 double output_gamma)) | |
| 1510 PNG_FIXED_EXPORT(228, void, png_set_alpha_mode_fixed, (png_structrp png_ptr, | |
| 1511 int mode, png_fixed_point output_gamma)) | |
| 1512 #endif | |
| 1513 | |
| 1514 #if defined(PNG_GAMMA_SUPPORTED) || defined(PNG_READ_ALPHA_MODE_SUPPORTED) | |
| 1515 /* The output_gamma value is a screen gamma in libpng terminology: it expresses | |
| 1516 * how to decode the output values, not how they are encoded. The values used | |
| 1517 * correspond to the normal numbers used to describe the overall gamma of a | |
| 1518 * computer display system; for example 2.2 for an sRGB conformant system. The | |
| 1519 * values are scaled by 100000 in the _fixed version of the API (so 220000 for | |
| 1520 * sRGB.) | |
| 1521 * | |
| 1522 * The inverse of the value is always used to provide a default for the PNG file | |
| 1523 * encoding if it has no gAMA chunk and if png_set_gamma() has not been called | |
| 1524 * to override the PNG gamma information. | |
| 1525 * | |
| 1526 * When the ALPHA_OPTIMIZED mode is selected the output gamma is used to encode | |
| 1527 * opaque pixels however pixels with lower alpha values are not encoded, | |
| 1528 * regardless of the output gamma setting. | |
| 1529 * | |
| 1530 * When the standard Porter Duff handling is requested with mode 1 the output | |
| 1531 * encoding is set to be linear and the output_gamma value is only relevant | |
| 1532 * as a default for input data that has no gamma information. The linear output | |
| 1533 * encoding will be overridden if png_set_gamma() is called - the results may be | |
| 1534 * highly unexpected! | |
| 1535 * | |
| 1536 * The following numbers are derived from the sRGB standard and the research | |
| 1537 * behind it. sRGB is defined to be approximated by a PNG gAMA chunk value of | |
| 1538 * 0.45455 (1/2.2) for PNG. The value implicitly includes any viewing | |
| 1539 * correction required to take account of any differences in the color | |
| 1540 * environment of the original scene and the intended display environment; the | |
| 1541 * value expresses how to *decode* the image for display, not how the original | |
| 1542 * data was *encoded*. | |
| 1543 * | |
| 1544 * sRGB provides a peg for the PNG standard by defining a viewing environment. | |
| 1545 * sRGB itself, and earlier TV standards, actually use a more complex transform | |
| 1546 * (a linear portion then a gamma 2.4 power law) than PNG can express. (PNG is | |
| 1547 * limited to simple power laws.) By saying that an image for direct display on | |
| 1548 * an sRGB conformant system should be stored with a gAMA chunk value of 45455 | |
| 1549 * (11.3.3.2 and 11.3.3.5 of the ISO PNG specification) the PNG specification | |
| 1550 * makes it possible to derive values for other display systems and | |
| 1551 * environments. | |
| 1552 * | |
| 1553 * The Mac value is deduced from the sRGB based on an assumption that the actual | |
| 1554 * extra viewing correction used in early Mac display systems was implemented as | |
| 1555 * a power 1.45 lookup table. | |
| 1556 * | |
| 1557 * Any system where a programmable lookup table is used or where the behavior of | |
| 1558 * the final display device characteristics can be changed requires system | |
| 1559 * specific code to obtain the current characteristic. However this can be | |
| 1560 * difficult and most PNG gamma correction only requires an approximate value. | |
| 1561 * | |
| 1562 * By default, if png_set_alpha_mode() is not called, libpng assumes that all | |
| 1563 * values are unencoded, linear, values and that the output device also has a | |
| 1564 * linear characteristic. This is only very rarely correct - it is invariably | |
| 1565 * better to call png_set_alpha_mode() with PNG_DEFAULT_sRGB than rely on the | |
| 1566 * default if you don't know what the right answer is! | |
| 1567 * | |
| 1568 * The special value PNG_GAMMA_MAC_18 indicates an older Mac system (pre Mac OS | |
| 1569 * 10.6) which used a correction table to implement a somewhat lower gamma on an | |
| 1570 * otherwise sRGB system. | |
| 1571 * | |
| 1572 * Both these values are reserved (not simple gamma values) in order to allow | |
| 1573 * more precise correction internally in the future. | |
| 1574 * | |
| 1575 * NOTE: the following values can be passed to either the fixed or floating | |
| 1576 * point APIs, but the floating point API will also accept floating point | |
| 1577 * values. | |
| 1578 */ | |
| 1579 #define PNG_DEFAULT_sRGB -1 /* sRGB gamma and color space */ | |
| 1580 #define PNG_GAMMA_MAC_18 -2 /* Old Mac '1.8' gamma and color space */ | |
| 1581 #define PNG_GAMMA_sRGB 220000 /* Television standards--matches sRGB gamma */ | |
| 1582 #define PNG_GAMMA_LINEAR PNG_FP_1 /* Linear */ | |
| 1583 #endif | |
| 1584 | |
| 1585 /* The following are examples of calls to png_set_alpha_mode to achieve the | |
| 1586 * required overall gamma correction and, where necessary, alpha | |
| 1587 * premultiplication. | |
| 1588 * | |
| 1589 * png_set_alpha_mode(pp, PNG_ALPHA_PNG, PNG_DEFAULT_sRGB); | |
| 1590 * This is the default libpng handling of the alpha channel - it is not | |
| 1591 * pre-multiplied into the color components. In addition the call states | |
| 1592 * that the output is for a sRGB system and causes all PNG files without gAMA | |
| 1593 * chunks to be assumed to be encoded using sRGB. | |
| 1594 * | |
| 1595 * png_set_alpha_mode(pp, PNG_ALPHA_PNG, PNG_GAMMA_MAC); | |
| 1596 * In this case the output is assumed to be something like an sRGB conformant | |
| 1597 * display preceeded by a power-law lookup table of power 1.45. This is how | |
| 1598 * early Mac systems behaved. | |
| 1599 * | |
| 1600 * png_set_alpha_mode(pp, PNG_ALPHA_STANDARD, PNG_GAMMA_LINEAR); | |
| 1601 * This is the classic Jim Blinn approach and will work in academic | |
| 1602 * environments where everything is done by the book. It has the shortcoming | |
| 1603 * of assuming that input PNG data with no gamma information is linear - this | |
| 1604 * is unlikely to be correct unless the PNG files where generated locally. | |
| 1605 * Most of the time the output precision will be so low as to show | |
| 1606 * significant banding in dark areas of the image. | |
| 1607 * | |
| 1608 * png_set_expand_16(pp); | |
| 1609 * png_set_alpha_mode(pp, PNG_ALPHA_STANDARD, PNG_DEFAULT_sRGB); | |
| 1610 * This is a somewhat more realistic Jim Blinn inspired approach. PNG files | |
| 1611 * are assumed to have the sRGB encoding if not marked with a gamma value and | |
| 1612 * the output is always 16 bits per component. This permits accurate scaling | |
| 1613 * and processing of the data. If you know that your input PNG files were | |
| 1614 * generated locally you might need to replace PNG_DEFAULT_sRGB with the | |
| 1615 * correct value for your system. | |
| 1616 * | |
| 1617 * png_set_alpha_mode(pp, PNG_ALPHA_OPTIMIZED, PNG_DEFAULT_sRGB); | |
| 1618 * If you just need to composite the PNG image onto an existing background | |
| 1619 * and if you control the code that does this you can use the optimization | |
| 1620 * setting. In this case you just copy completely opaque pixels to the | |
| 1621 * output. For pixels that are not completely transparent (you just skip | |
| 1622 * those) you do the composition math using png_composite or png_composite_16 | |
| 1623 * below then encode the resultant 8-bit or 16-bit values to match the output | |
| 1624 * encoding. | |
| 1625 * | |
| 1626 * Other cases | |
| 1627 * If neither the PNG nor the standard linear encoding work for you because | |
| 1628 * of the software or hardware you use then you have a big problem. The PNG | |
| 1629 * case will probably result in halos around the image. The linear encoding | |
| 1630 * will probably result in a washed out, too bright, image (it's actually too | |
| 1631 * contrasty.) Try the ALPHA_OPTIMIZED mode above - this will probably | |
| 1632 * substantially reduce the halos. Alternatively try: | |
| 1633 * | |
| 1634 * png_set_alpha_mode(pp, PNG_ALPHA_BROKEN, PNG_DEFAULT_sRGB); | |
| 1635 * This option will also reduce the halos, but there will be slight dark | |
| 1636 * halos round the opaque parts of the image where the background is light. | |
| 1637 * In the OPTIMIZED mode the halos will be light halos where the background | |
| 1638 * is dark. Take your pick - the halos are unavoidable unless you can get | |
| 1639 * your hardware/software fixed! (The OPTIMIZED approach is slightly | |
| 1640 * faster.) | |
| 1641 * | |
| 1642 * When the default gamma of PNG files doesn't match the output gamma. | |
| 1643 * If you have PNG files with no gamma information png_set_alpha_mode allows | |
| 1644 * you to provide a default gamma, but it also sets the ouput gamma to the | |
| 1645 * matching value. If you know your PNG files have a gamma that doesn't | |
| 1646 * match the output you can take advantage of the fact that | |
| 1647 * png_set_alpha_mode always sets the output gamma but only sets the PNG | |
| 1648 * default if it is not already set: | |
| 1649 * | |
| 1650 * png_set_alpha_mode(pp, PNG_ALPHA_PNG, PNG_DEFAULT_sRGB); | |
| 1651 * png_set_alpha_mode(pp, PNG_ALPHA_PNG, PNG_GAMMA_MAC); | |
| 1652 * The first call sets both the default and the output gamma values, the | |
| 1653 * second call overrides the output gamma without changing the default. This | |
| 1654 * is easier than achieving the same effect with png_set_gamma. You must use | |
| 1655 * PNG_ALPHA_PNG for the first call - internal checking in png_set_alpha will | |
| 1656 * fire if more than one call to png_set_alpha_mode and png_set_background is | |
| 1657 * made in the same read operation, however multiple calls with PNG_ALPHA_PNG | |
| 1658 * are ignored. | |
| 1659 */ | |
| 1660 | |
| 1661 #ifdef PNG_READ_STRIP_ALPHA_SUPPORTED | |
| 1662 PNG_EXPORT(36, void, png_set_strip_alpha, (png_structrp png_ptr)); | |
| 1663 #endif | |
| 1664 | |
| 1665 #if defined(PNG_READ_SWAP_ALPHA_SUPPORTED) || \ | |
| 1666 defined(PNG_WRITE_SWAP_ALPHA_SUPPORTED) | |
| 1667 PNG_EXPORT(37, void, png_set_swap_alpha, (png_structrp png_ptr)); | |
| 1668 #endif | |
| 1669 | |
| 1670 #if defined(PNG_READ_INVERT_ALPHA_SUPPORTED) || \ | |
| 1671 defined(PNG_WRITE_INVERT_ALPHA_SUPPORTED) | |
| 1672 PNG_EXPORT(38, void, png_set_invert_alpha, (png_structrp png_ptr)); | |
| 1673 #endif | |
| 1674 | |
| 1675 #if defined(PNG_READ_FILLER_SUPPORTED) || defined(PNG_WRITE_FILLER_SUPPORTED) | |
| 1676 /* Add a filler byte to 8-bit Gray or 24-bit RGB images. */ | |
| 1677 PNG_EXPORT(39, void, png_set_filler, (png_structrp png_ptr, png_uint_32 filler, | |
| 1678 int flags)); | |
| 1679 /* The values of the PNG_FILLER_ defines should NOT be changed */ | |
| 1680 # define PNG_FILLER_BEFORE 0 | |
| 1681 # define PNG_FILLER_AFTER 1 | |
| 1682 /* Add an alpha byte to 8-bit Gray or 24-bit RGB images. */ | |
| 1683 PNG_EXPORT(40, void, png_set_add_alpha, (png_structrp png_ptr, | |
| 1684 png_uint_32 filler, int flags)); | |
| 1685 #endif /* PNG_READ_FILLER_SUPPORTED || PNG_WRITE_FILLER_SUPPORTED */ | |
| 1686 | |
| 1687 #if defined(PNG_READ_SWAP_SUPPORTED) || defined(PNG_WRITE_SWAP_SUPPORTED) | |
| 1688 /* Swap bytes in 16-bit depth files. */ | |
| 1689 PNG_EXPORT(41, void, png_set_swap, (png_structrp png_ptr)); | |
| 1690 #endif | |
| 1691 | |
| 1692 #if defined(PNG_READ_PACK_SUPPORTED) || defined(PNG_WRITE_PACK_SUPPORTED) | |
| 1693 /* Use 1 byte per pixel in 1, 2, or 4-bit depth files. */ | |
| 1694 PNG_EXPORT(42, void, png_set_packing, (png_structrp png_ptr)); | |
| 1695 #endif | |
| 1696 | |
| 1697 #if defined(PNG_READ_PACKSWAP_SUPPORTED) || \ | |
| 1698 defined(PNG_WRITE_PACKSWAP_SUPPORTED) | |
| 1699 /* Swap packing order of pixels in bytes. */ | |
| 1700 PNG_EXPORT(43, void, png_set_packswap, (png_structrp png_ptr)); | |
| 1701 #endif | |
| 1702 | |
| 1703 #if defined(PNG_READ_SHIFT_SUPPORTED) || defined(PNG_WRITE_SHIFT_SUPPORTED) | |
| 1704 /* Converts files to legal bit depths. */ | |
| 1705 PNG_EXPORT(44, void, png_set_shift, (png_structrp png_ptr, png_const_color_8p | |
| 1706 true_bits)); | |
| 1707 #endif | |
| 1708 | |
| 1709 #if defined(PNG_READ_INTERLACING_SUPPORTED) || \ | |
| 1710 defined(PNG_WRITE_INTERLACING_SUPPORTED) | |
| 1711 /* Have the code handle the interlacing. Returns the number of passes. | |
| 1712 * MUST be called before png_read_update_info or png_start_read_image, | |
| 1713 * otherwise it will not have the desired effect. Note that it is still | |
| 1714 * necessary to call png_read_row or png_read_rows png_get_image_height | |
| 1715 * times for each pass. | |
| 1716 */ | |
| 1717 PNG_EXPORT(45, int, png_set_interlace_handling, (png_structrp png_ptr)); | |
| 1718 #endif | |
| 1719 | |
| 1720 #if defined(PNG_READ_INVERT_SUPPORTED) || defined(PNG_WRITE_INVERT_SUPPORTED) | |
| 1721 /* Invert monochrome files */ | |
| 1722 PNG_EXPORT(46, void, png_set_invert_mono, (png_structrp png_ptr)); | |
| 1723 #endif | |
| 1724 | |
| 1725 #ifdef PNG_READ_BACKGROUND_SUPPORTED | |
| 1726 /* Handle alpha and tRNS by replacing with a background color. Prior to | |
| 1727 * libpng-1.5.4 this API must not be called before the PNG file header has been | |
| 1728 * read. Doing so will result in unexpected behavior and possible warnings or | |
| 1729 * errors if the PNG file contains a bKGD chunk. | |
| 1730 */ | |
| 1731 PNG_FP_EXPORT(47, void, png_set_background, (png_structrp png_ptr, | |
| 1732 png_const_color_16p background_color, int background_gamma_code, | |
| 1733 int need_expand, double background_gamma)) | |
| 1734 PNG_FIXED_EXPORT(215, void, png_set_background_fixed, (png_structrp png_ptr, | |
| 1735 png_const_color_16p background_color, int background_gamma_code, | |
| 1736 int need_expand, png_fixed_point background_gamma)) | |
| 1737 #endif | |
| 1738 #ifdef PNG_READ_BACKGROUND_SUPPORTED | |
| 1739 # define PNG_BACKGROUND_GAMMA_UNKNOWN 0 | |
| 1740 # define PNG_BACKGROUND_GAMMA_SCREEN 1 | |
| 1741 # define PNG_BACKGROUND_GAMMA_FILE 2 | |
| 1742 # define PNG_BACKGROUND_GAMMA_UNIQUE 3 | |
| 1743 #endif | |
| 1744 | |
| 1745 #ifdef PNG_READ_SCALE_16_TO_8_SUPPORTED | |
| 1746 /* Scale a 16-bit depth file down to 8-bit, accurately. */ | |
| 1747 PNG_EXPORT(229, void, png_set_scale_16, (png_structrp png_ptr)); | |
| 1748 #endif | |
| 1749 | |
| 1750 #ifdef PNG_READ_STRIP_16_TO_8_SUPPORTED | |
| 1751 #define PNG_READ_16_TO_8 SUPPORTED /* Name prior to 1.5.4 */ | |
| 1752 /* Strip the second byte of information from a 16-bit depth file. */ | |
| 1753 PNG_EXPORT(48, void, png_set_strip_16, (png_structrp png_ptr)); | |
| 1754 #endif | |
| 1755 | |
| 1756 #ifdef PNG_READ_QUANTIZE_SUPPORTED | |
| 1757 /* Turn on quantizing, and reduce the palette to the number of colors | |
| 1758 * available. | |
| 1759 */ | |
| 1760 PNG_EXPORT(49, void, png_set_quantize, (png_structrp png_ptr, | |
| 1761 png_colorp palette, int num_palette, int maximum_colors, | |
| 1762 png_const_uint_16p histogram, int full_quantize)); | |
| 1763 #endif | |
| 1764 | |
| 1765 #ifdef PNG_READ_GAMMA_SUPPORTED | |
| 1766 /* The threshold on gamma processing is configurable but hard-wired into the | |
| 1767 * library. The following is the floating point variant. | |
| 1768 */ | |
| 1769 #define PNG_GAMMA_THRESHOLD (PNG_GAMMA_THRESHOLD_FIXED*.00001) | |
| 1770 | |
| 1771 /* Handle gamma correction. Screen_gamma=(display_exponent). | |
| 1772 * NOTE: this API simply sets the screen and file gamma values. It will | |
| 1773 * therefore override the value for gamma in a PNG file if it is called after | |
| 1774 * the file header has been read - use with care - call before reading the PNG | |
| 1775 * file for best results! | |
| 1776 * | |
| 1777 * These routines accept the same gamma values as png_set_alpha_mode (described | |
| 1778 * above). The PNG_GAMMA_ defines and PNG_DEFAULT_sRGB can be passed to either | |
| 1779 * API (floating point or fixed.) Notice, however, that the 'file_gamma' value | |
| 1780 * is the inverse of a 'screen gamma' value. | |
| 1781 */ | |
| 1782 PNG_FP_EXPORT(50, void, png_set_gamma, (png_structrp png_ptr, | |
| 1783 double screen_gamma, double override_file_gamma)) | |
| 1784 PNG_FIXED_EXPORT(208, void, png_set_gamma_fixed, (png_structrp png_ptr, | |
| 1785 png_fixed_point screen_gamma, png_fixed_point override_file_gamma)) | |
| 1786 #endif | |
| 1787 | |
| 1788 #ifdef PNG_WRITE_FLUSH_SUPPORTED | |
| 1789 /* Set how many lines between output flushes - 0 for no flushing */ | |
| 1790 PNG_EXPORT(51, void, png_set_flush, (png_structrp png_ptr, int nrows)); | |
| 1791 /* Flush the current PNG output buffer */ | |
| 1792 PNG_EXPORT(52, void, png_write_flush, (png_structrp png_ptr)); | |
| 1793 #endif | |
| 1794 | |
| 1795 /* Optional update palette with requested transformations */ | |
| 1796 PNG_EXPORT(53, void, png_start_read_image, (png_structrp png_ptr)); | |
| 1797 | |
| 1798 /* Optional call to update the users info structure */ | |
| 1799 PNG_EXPORT(54, void, png_read_update_info, (png_structrp png_ptr, | |
| 1800 png_inforp info_ptr)); | |
| 1801 | |
| 1802 #ifdef PNG_SEQUENTIAL_READ_SUPPORTED | |
| 1803 /* Read one or more rows of image data. */ | |
| 1804 PNG_EXPORT(55, void, png_read_rows, (png_structrp png_ptr, png_bytepp row, | |
| 1805 png_bytepp display_row, png_uint_32 num_rows)); | |
| 1806 #endif | |
| 1807 | |
| 1808 #ifdef PNG_SEQUENTIAL_READ_SUPPORTED | |
| 1809 /* Read a row of data. */ | |
| 1810 PNG_EXPORT(56, void, png_read_row, (png_structrp png_ptr, png_bytep row, | |
| 1811 png_bytep display_row)); | |
| 1812 #endif | |
| 1813 | |
| 1814 #ifdef PNG_SEQUENTIAL_READ_SUPPORTED | |
| 1815 /* Read the whole image into memory at once. */ | |
| 1816 PNG_EXPORT(57, void, png_read_image, (png_structrp png_ptr, png_bytepp image)); | |
| 1817 #endif | |
| 1818 | |
| 1819 /* Write a row of image data */ | |
| 1820 PNG_EXPORT(58, void, png_write_row, (png_structrp png_ptr, | |
| 1821 png_const_bytep row)); | |
| 1822 | |
| 1823 /* Write a few rows of image data: (*row) is not written; however, the type | |
| 1824 * is declared as writeable to maintain compatibility with previous versions | |
| 1825 * of libpng and to allow the 'display_row' array from read_rows to be passed | |
| 1826 * unchanged to write_rows. | |
| 1827 */ | |
| 1828 PNG_EXPORT(59, void, png_write_rows, (png_structrp png_ptr, png_bytepp row, | |
| 1829 png_uint_32 num_rows)); | |
| 1830 | |
| 1831 /* Write the image data */ | |
| 1832 PNG_EXPORT(60, void, png_write_image, (png_structrp png_ptr, png_bytepp image)); | |
| 1833 | |
| 1834 /* Write the end of the PNG file. */ | |
| 1835 PNG_EXPORT(61, void, png_write_end, (png_structrp png_ptr, | |
| 1836 png_inforp info_ptr)); | |
| 1837 | |
| 1838 #ifdef PNG_SEQUENTIAL_READ_SUPPORTED | |
| 1839 /* Read the end of the PNG file. */ | |
| 1840 PNG_EXPORT(62, void, png_read_end, (png_structrp png_ptr, png_inforp info_ptr)); | |
| 1841 #endif | |
| 1842 | |
| 1843 /* Free any memory associated with the png_info_struct */ | |
| 1844 PNG_EXPORT(63, void, png_destroy_info_struct, (png_const_structrp png_ptr, | |
| 1845 png_infopp info_ptr_ptr)); | |
| 1846 | |
| 1847 /* Free any memory associated with the png_struct and the png_info_structs */ | |
| 1848 PNG_EXPORT(64, void, png_destroy_read_struct, (png_structpp png_ptr_ptr, | |
| 1849 png_infopp info_ptr_ptr, png_infopp end_info_ptr_ptr)); | |
| 1850 | |
| 1851 /* Free any memory associated with the png_struct and the png_info_structs */ | |
| 1852 PNG_EXPORT(65, void, png_destroy_write_struct, (png_structpp png_ptr_ptr, | |
| 1853 png_infopp info_ptr_ptr)); | |
| 1854 | |
| 1855 /* Set the libpng method of handling chunk CRC errors */ | |
| 1856 PNG_EXPORT(66, void, png_set_crc_action, (png_structrp png_ptr, int crit_action, | |
| 1857 int ancil_action)); | |
| 1858 | |
| 1859 /* Values for png_set_crc_action() say how to handle CRC errors in | |
| 1860 * ancillary and critical chunks, and whether to use the data contained | |
| 1861 * therein. Note that it is impossible to "discard" data in a critical | |
| 1862 * chunk. For versions prior to 0.90, the action was always error/quit, | |
| 1863 * whereas in version 0.90 and later, the action for CRC errors in ancillary | |
| 1864 * chunks is warn/discard. These values should NOT be changed. | |
| 1865 * | |
| 1866 * value action:critical action:ancillary | |
| 1867 */ | |
| 1868 #define PNG_CRC_DEFAULT 0 /* error/quit warn/discard data */ | |
| 1869 #define PNG_CRC_ERROR_QUIT 1 /* error/quit error/quit */ | |
| 1870 #define PNG_CRC_WARN_DISCARD 2 /* (INVALID) warn/discard data */ | |
| 1871 #define PNG_CRC_WARN_USE 3 /* warn/use data warn/use data */ | |
| 1872 #define PNG_CRC_QUIET_USE 4 /* quiet/use data quiet/use data */ | |
| 1873 #define PNG_CRC_NO_CHANGE 5 /* use current value use current value */ | |
| 1874 | |
| 1875 /* These functions give the user control over the scan-line filtering in | |
| 1876 * libpng and the compression methods used by zlib. These functions are | |
| 1877 * mainly useful for testing, as the defaults should work with most users. | |
| 1878 * Those users who are tight on memory or want faster performance at the | |
| 1879 * expense of compression can modify them. See the compression library | |
| 1880 * header file (zlib.h) for an explination of the compression functions. | |
| 1881 */ | |
| 1882 | |
| 1883 /* Set the filtering method(s) used by libpng. Currently, the only valid | |
| 1884 * value for "method" is 0. | |
| 1885 */ | |
| 1886 PNG_EXPORT(67, void, png_set_filter, (png_structrp png_ptr, int method, | |
| 1887 int filters)); | |
| 1888 | |
| 1889 /* Flags for png_set_filter() to say which filters to use. The flags | |
| 1890 * are chosen so that they don't conflict with real filter types | |
| 1891 * below, in case they are supplied instead of the #defined constants. | |
| 1892 * These values should NOT be changed. | |
| 1893 */ | |
| 1894 #define PNG_NO_FILTERS 0x00 | |
| 1895 #define PNG_FILTER_NONE 0x08 | |
| 1896 #define PNG_FILTER_SUB 0x10 | |
| 1897 #define PNG_FILTER_UP 0x20 | |
| 1898 #define PNG_FILTER_AVG 0x40 | |
| 1899 #define PNG_FILTER_PAETH 0x80 | |
| 1900 #define PNG_ALL_FILTERS (PNG_FILTER_NONE | PNG_FILTER_SUB | PNG_FILTER_UP | \ | |
| 1901 PNG_FILTER_AVG | PNG_FILTER_PAETH) | |
| 1902 | |
| 1903 /* Filter values (not flags) - used in pngwrite.c, pngwutil.c for now. | |
| 1904 * These defines should NOT be changed. | |
| 1905 */ | |
| 1906 #define PNG_FILTER_VALUE_NONE 0 | |
| 1907 #define PNG_FILTER_VALUE_SUB 1 | |
| 1908 #define PNG_FILTER_VALUE_UP 2 | |
| 1909 #define PNG_FILTER_VALUE_AVG 3 | |
| 1910 #define PNG_FILTER_VALUE_PAETH 4 | |
| 1911 #define PNG_FILTER_VALUE_LAST 5 | |
| 1912 | |
| 1913 #ifdef PNG_WRITE_WEIGHTED_FILTER_SUPPORTED /* EXPERIMENTAL */ | |
| 1914 /* The "heuristic_method" is given by one of the PNG_FILTER_HEURISTIC_ | |
| 1915 * defines, either the default (minimum-sum-of-absolute-differences), or | |
| 1916 * the experimental method (weighted-minimum-sum-of-absolute-differences). | |
| 1917 * | |
| 1918 * Weights are factors >= 1.0, indicating how important it is to keep the | |
| 1919 * filter type consistent between rows. Larger numbers mean the current | |
| 1920 * filter is that many times as likely to be the same as the "num_weights" | |
| 1921 * previous filters. This is cumulative for each previous row with a weight. | |
| 1922 * There needs to be "num_weights" values in "filter_weights", or it can be | |
| 1923 * NULL if the weights aren't being specified. Weights have no influence on | |
| 1924 * the selection of the first row filter. Well chosen weights can (in theory) | |
| 1925 * improve the compression for a given image. | |
| 1926 * | |
| 1927 * Costs are factors >= 1.0 indicating the relative decoding costs of a | |
| 1928 * filter type. Higher costs indicate more decoding expense, and are | |
| 1929 * therefore less likely to be selected over a filter with lower computational | |
| 1930 * costs. There needs to be a value in "filter_costs" for each valid filter | |
| 1931 * type (given by PNG_FILTER_VALUE_LAST), or it can be NULL if you aren't | |
| 1932 * setting the costs. Costs try to improve the speed of decompression without | |
| 1933 * unduly increasing the compressed image size. | |
| 1934 * | |
| 1935 * A negative weight or cost indicates the default value is to be used, and | |
| 1936 * values in the range [0.0, 1.0) indicate the value is to remain unchanged. | |
| 1937 * The default values for both weights and costs are currently 1.0, but may | |
| 1938 * change if good general weighting/cost heuristics can be found. If both | |
| 1939 * the weights and costs are set to 1.0, this degenerates the WEIGHTED method | |
| 1940 * to the UNWEIGHTED method, but with added encoding time/computation. | |
| 1941 */ | |
| 1942 PNG_FP_EXPORT(68, void, png_set_filter_heuristics, (png_structrp png_ptr, | |
| 1943 int heuristic_method, int num_weights, png_const_doublep filter_weights, | |
| 1944 png_const_doublep filter_costs)) | |
| 1945 PNG_FIXED_EXPORT(209, void, png_set_filter_heuristics_fixed, | |
| 1946 (png_structrp png_ptr, int heuristic_method, int num_weights, | |
| 1947 png_const_fixed_point_p filter_weights, | |
| 1948 png_const_fixed_point_p filter_costs)) | |
| 1949 #endif /* PNG_WRITE_WEIGHTED_FILTER_SUPPORTED */ | |
| 1950 | |
| 1951 /* Heuristic used for row filter selection. These defines should NOT be | |
| 1952 * changed. | |
| 1953 */ | |
| 1954 #define PNG_FILTER_HEURISTIC_DEFAULT 0 /* Currently "UNWEIGHTED" */ | |
| 1955 #define PNG_FILTER_HEURISTIC_UNWEIGHTED 1 /* Used by libpng < 0.95 */ | |
| 1956 #define PNG_FILTER_HEURISTIC_WEIGHTED 2 /* Experimental feature */ | |
| 1957 #define PNG_FILTER_HEURISTIC_LAST 3 /* Not a valid value */ | |
| 1958 | |
| 1959 #ifdef PNG_WRITE_SUPPORTED | |
| 1960 /* Set the library compression level. Currently, valid values range from | |
| 1961 * 0 - 9, corresponding directly to the zlib compression levels 0 - 9 | |
| 1962 * (0 - no compression, 9 - "maximal" compression). Note that tests have | |
| 1963 * shown that zlib compression levels 3-6 usually perform as well as level 9 | |
| 1964 * for PNG images, and do considerably fewer caclulations. In the future, | |
| 1965 * these values may not correspond directly to the zlib compression levels. | |
| 1966 */ | |
| 1967 PNG_EXPORT(69, void, png_set_compression_level, (png_structrp png_ptr, | |
| 1968 int level)); | |
| 1969 | |
| 1970 PNG_EXPORT(70, void, png_set_compression_mem_level, (png_structrp png_ptr, | |
| 1971 int mem_level)); | |
| 1972 | |
| 1973 PNG_EXPORT(71, void, png_set_compression_strategy, (png_structrp png_ptr, | |
| 1974 int strategy)); | |
| 1975 | |
| 1976 /* If PNG_WRITE_OPTIMIZE_CMF_SUPPORTED is defined, libpng will use a | |
| 1977 * smaller value of window_bits if it can do so safely. | |
| 1978 */ | |
| 1979 PNG_EXPORT(72, void, png_set_compression_window_bits, (png_structrp png_ptr, | |
| 1980 int window_bits)); | |
| 1981 | |
| 1982 PNG_EXPORT(73, void, png_set_compression_method, (png_structrp png_ptr, | |
| 1983 int method)); | |
| 1984 #endif | |
| 1985 | |
| 1986 #ifdef PNG_WRITE_CUSTOMIZE_ZTXT_COMPRESSION_SUPPORTED | |
| 1987 /* Also set zlib parameters for compressing non-IDAT chunks */ | |
| 1988 PNG_EXPORT(222, void, png_set_text_compression_level, (png_structrp png_ptr, | |
| 1989 int level)); | |
| 1990 | |
| 1991 PNG_EXPORT(223, void, png_set_text_compression_mem_level, (png_structrp png_ptr, | |
| 1992 int mem_level)); | |
| 1993 | |
| 1994 PNG_EXPORT(224, void, png_set_text_compression_strategy, (png_structrp png_ptr, | |
| 1995 int strategy)); | |
| 1996 | |
| 1997 /* If PNG_WRITE_OPTIMIZE_CMF_SUPPORTED is defined, libpng will use a | |
| 1998 * smaller value of window_bits if it can do so safely. | |
| 1999 */ | |
| 2000 PNG_EXPORT(225, void, png_set_text_compression_window_bits, | |
| 2001 (png_structrp png_ptr, int window_bits)); | |
| 2002 | |
| 2003 PNG_EXPORT(226, void, png_set_text_compression_method, (png_structrp png_ptr, | |
| 2004 int method)); | |
| 2005 #endif /* PNG_WRITE_CUSTOMIZE_ZTXT_COMPRESSION_SUPPORTED */ | |
| 2006 | |
| 2007 /* These next functions are called for input/output, memory, and error | |
| 2008 * handling. They are in the file pngrio.c, pngwio.c, and pngerror.c, | |
| 2009 * and call standard C I/O routines such as fread(), fwrite(), and | |
| 2010 * fprintf(). These functions can be made to use other I/O routines | |
| 2011 * at run time for those applications that need to handle I/O in a | |
| 2012 * different manner by calling png_set_???_fn(). See libpng-manual.txt for | |
| 2013 * more information. | |
| 2014 */ | |
| 2015 | |
| 2016 #ifdef PNG_STDIO_SUPPORTED | |
| 2017 /* Initialize the input/output for the PNG file to the default functions. */ | |
| 2018 PNG_EXPORT(74, void, png_init_io, (png_structrp png_ptr, png_FILE_p fp)); | |
| 2019 #endif | |
| 2020 | |
| 2021 /* Replace the (error and abort), and warning functions with user | |
| 2022 * supplied functions. If no messages are to be printed you must still | |
| 2023 * write and use replacement functions. The replacement error_fn should | |
| 2024 * still do a longjmp to the last setjmp location if you are using this | |
| 2025 * method of error handling. If error_fn or warning_fn is NULL, the | |
| 2026 * default function will be used. | |
| 2027 */ | |
| 2028 | |
| 2029 PNG_EXPORT(75, void, png_set_error_fn, (png_structrp png_ptr, | |
| 2030 png_voidp error_ptr, png_error_ptr error_fn, png_error_ptr warning_fn)); | |
| 2031 | |
| 2032 /* Return the user pointer associated with the error functions */ | |
| 2033 PNG_EXPORT(76, png_voidp, png_get_error_ptr, (png_const_structrp png_ptr)); | |
| 2034 | |
| 2035 /* Replace the default data output functions with a user supplied one(s). | |
| 2036 * If buffered output is not used, then output_flush_fn can be set to NULL. | |
| 2037 * If PNG_WRITE_FLUSH_SUPPORTED is not defined at libpng compile time | |
| 2038 * output_flush_fn will be ignored (and thus can be NULL). | |
| 2039 * It is probably a mistake to use NULL for output_flush_fn if | |
| 2040 * write_data_fn is not also NULL unless you have built libpng with | |
| 2041 * PNG_WRITE_FLUSH_SUPPORTED undefined, because in this case libpng's | |
| 2042 * default flush function, which uses the standard *FILE structure, will | |
| 2043 * be used. | |
| 2044 */ | |
| 2045 PNG_EXPORT(77, void, png_set_write_fn, (png_structrp png_ptr, png_voidp io_ptr, | |
| 2046 png_rw_ptr write_data_fn, png_flush_ptr output_flush_fn)); | |
| 2047 | |
| 2048 /* Replace the default data input function with a user supplied one. */ | |
| 2049 PNG_EXPORT(78, void, png_set_read_fn, (png_structrp png_ptr, png_voidp io_ptr, | |
| 2050 png_rw_ptr read_data_fn)); | |
| 2051 | |
| 2052 /* Return the user pointer associated with the I/O functions */ | |
| 2053 PNG_EXPORT(79, png_voidp, png_get_io_ptr, (png_const_structrp png_ptr)); | |
| 2054 | |
| 2055 PNG_EXPORT(80, void, png_set_read_status_fn, (png_structrp png_ptr, | |
| 2056 png_read_status_ptr read_row_fn)); | |
| 2057 | |
| 2058 PNG_EXPORT(81, void, png_set_write_status_fn, (png_structrp png_ptr, | |
| 2059 png_write_status_ptr write_row_fn)); | |
| 2060 | |
| 2061 #ifdef PNG_USER_MEM_SUPPORTED | |
| 2062 /* Replace the default memory allocation functions with user supplied one(s). */ | |
| 2063 PNG_EXPORT(82, void, png_set_mem_fn, (png_structrp png_ptr, png_voidp mem_ptr, | |
| 2064 png_malloc_ptr malloc_fn, png_free_ptr free_fn)); | |
| 2065 /* Return the user pointer associated with the memory functions */ | |
| 2066 PNG_EXPORT(83, png_voidp, png_get_mem_ptr, (png_const_structrp png_ptr)); | |
| 2067 #endif | |
| 2068 | |
| 2069 #ifdef PNG_READ_USER_TRANSFORM_SUPPORTED | |
| 2070 PNG_EXPORT(84, void, png_set_read_user_transform_fn, (png_structrp png_ptr, | |
| 2071 png_user_transform_ptr read_user_transform_fn)); | |
| 2072 #endif | |
| 2073 | |
| 2074 #ifdef PNG_WRITE_USER_TRANSFORM_SUPPORTED | |
| 2075 PNG_EXPORT(85, void, png_set_write_user_transform_fn, (png_structrp png_ptr, | |
| 2076 png_user_transform_ptr write_user_transform_fn)); | |
| 2077 #endif | |
| 2078 | |
| 2079 #ifdef PNG_USER_TRANSFORM_PTR_SUPPORTED | |
| 2080 PNG_EXPORT(86, void, png_set_user_transform_info, (png_structrp png_ptr, | |
| 2081 png_voidp user_transform_ptr, int user_transform_depth, | |
| 2082 int user_transform_channels)); | |
| 2083 /* Return the user pointer associated with the user transform functions */ | |
| 2084 PNG_EXPORT(87, png_voidp, png_get_user_transform_ptr, | |
| 2085 (png_const_structrp png_ptr)); | |
| 2086 #endif | |
| 2087 | |
| 2088 #ifdef PNG_USER_TRANSFORM_INFO_SUPPORTED | |
| 2089 /* Return information about the row currently being processed. Note that these | |
| 2090 * APIs do not fail but will return unexpected results if called outside a user | |
| 2091 * transform callback. Also note that when transforming an interlaced image the | |
| 2092 * row number is the row number within the sub-image of the interlace pass, so | |
| 2093 * the value will increase to the height of the sub-image (not the full image) | |
| 2094 * then reset to 0 for the next pass. | |
| 2095 * | |
| 2096 * Use PNG_ROW_FROM_PASS_ROW(row, pass) and PNG_COL_FROM_PASS_COL(col, pass) to | |
| 2097 * find the output pixel (x,y) given an interlaced sub-image pixel | |
| 2098 * (row,col,pass). (See below for these macros.) | |
| 2099 */ | |
| 2100 PNG_EXPORT(217, png_uint_32, png_get_current_row_number, (png_const_structrp)); | |
| 2101 PNG_EXPORT(218, png_byte, png_get_current_pass_number, (png_const_structrp)); | |
| 2102 #endif | |
| 2103 | |
| 2104 #ifdef PNG_READ_USER_CHUNKS_SUPPORTED | |
| 2105 /* This callback is called only for *unknown* chunks. If | |
| 2106 * PNG_HANDLE_AS_UNKNOWN_SUPPORTED is set then it is possible to set known | |
| 2107 * chunks to be treated as unknown, however in this case the callback must do | |
| 2108 * any processing required by the chunk (e.g. by calling the appropriate | |
| 2109 * png_set_ APIs.) | |
| 2110 * | |
| 2111 * There is no write support - on write, by default, all the chunks in the | |
| 2112 * 'unknown' list are written in the specified position. | |
| 2113 * | |
| 2114 * The integer return from the callback function is interpreted thus: | |
| 2115 * | |
| 2116 * negative: An error occured, png_chunk_error will be called. | |
| 2117 * zero: The chunk was not handled, the chunk will be saved. A critical | |
| 2118 * chunk will cause an error at this point unless it is to be saved. | |
| 2119 * positive: The chunk was handled, libpng will ignore/discard it. | |
| 2120 * | |
| 2121 * See "INTERACTION WTIH USER CHUNK CALLBACKS" below for important notes about | |
| 2122 * how this behavior will change in libpng 1.7 | |
| 2123 */ | |
| 2124 PNG_EXPORT(88, void, png_set_read_user_chunk_fn, (png_structrp png_ptr, | |
| 2125 png_voidp user_chunk_ptr, png_user_chunk_ptr read_user_chunk_fn)); | |
| 2126 #endif | |
| 2127 | |
| 2128 #ifdef PNG_USER_CHUNKS_SUPPORTED | |
| 2129 PNG_EXPORT(89, png_voidp, png_get_user_chunk_ptr, (png_const_structrp png_ptr)); | |
| 2130 #endif | |
| 2131 | |
| 2132 #ifdef PNG_PROGRESSIVE_READ_SUPPORTED | |
| 2133 /* Sets the function callbacks for the push reader, and a pointer to a | |
| 2134 * user-defined structure available to the callback functions. | |
| 2135 */ | |
| 2136 PNG_EXPORT(90, void, png_set_progressive_read_fn, (png_structrp png_ptr, | |
| 2137 png_voidp progressive_ptr, png_progressive_info_ptr info_fn, | |
| 2138 png_progressive_row_ptr row_fn, png_progressive_end_ptr end_fn)); | |
| 2139 | |
| 2140 /* Returns the user pointer associated with the push read functions */ | |
| 2141 PNG_EXPORT(91, png_voidp, png_get_progressive_ptr, | |
| 2142 (png_const_structrp png_ptr)); | |
| 2143 | |
| 2144 /* Function to be called when data becomes available */ | |
| 2145 PNG_EXPORT(92, void, png_process_data, (png_structrp png_ptr, | |
| 2146 png_inforp info_ptr, png_bytep buffer, png_size_t buffer_size)); | |
| 2147 | |
| 2148 /* A function which may be called *only* within png_process_data to stop the | |
| 2149 * processing of any more data. The function returns the number of bytes | |
| 2150 * remaining, excluding any that libpng has cached internally. A subsequent | |
| 2151 * call to png_process_data must supply these bytes again. If the argument | |
| 2152 * 'save' is set to true the routine will first save all the pending data and | |
| 2153 * will always return 0. | |
| 2154 */ | |
| 2155 PNG_EXPORT(219, png_size_t, png_process_data_pause, (png_structrp, int save)); | |
| 2156 | |
| 2157 /* A function which may be called *only* outside (after) a call to | |
| 2158 * png_process_data. It returns the number of bytes of data to skip in the | |
| 2159 * input. Normally it will return 0, but if it returns a non-zero value the | |
| 2160 * application must skip than number of bytes of input data and pass the | |
| 2161 * following data to the next call to png_process_data. | |
| 2162 */ | |
| 2163 PNG_EXPORT(220, png_uint_32, png_process_data_skip, (png_structrp)); | |
| 2164 | |
| 2165 #ifdef PNG_READ_INTERLACING_SUPPORTED | |
| 2166 /* Function that combines rows. 'new_row' is a flag that should come from | |
| 2167 * the callback and be non-NULL if anything needs to be done; the library | |
| 2168 * stores its own version of the new data internally and ignores the passed | |
| 2169 * in value. | |
| 2170 */ | |
| 2171 PNG_EXPORT(93, void, png_progressive_combine_row, (png_const_structrp png_ptr, | |
| 2172 png_bytep old_row, png_const_bytep new_row)); | |
| 2173 #endif /* PNG_READ_INTERLACING_SUPPORTED */ | |
| 2174 #endif /* PNG_PROGRESSIVE_READ_SUPPORTED */ | |
| 2175 | |
| 2176 PNG_EXPORTA(94, png_voidp, png_malloc, (png_const_structrp png_ptr, | |
| 2177 png_alloc_size_t size), PNG_ALLOCATED); | |
| 2178 /* Added at libpng version 1.4.0 */ | |
| 2179 PNG_EXPORTA(95, png_voidp, png_calloc, (png_const_structrp png_ptr, | |
| 2180 png_alloc_size_t size), PNG_ALLOCATED); | |
| 2181 | |
| 2182 /* Added at libpng version 1.2.4 */ | |
| 2183 PNG_EXPORTA(96, png_voidp, png_malloc_warn, (png_const_structrp png_ptr, | |
| 2184 png_alloc_size_t size), PNG_ALLOCATED); | |
| 2185 | |
| 2186 /* Frees a pointer allocated by png_malloc() */ | |
| 2187 PNG_EXPORT(97, void, png_free, (png_const_structrp png_ptr, png_voidp ptr)); | |
| 2188 | |
| 2189 /* Free data that was allocated internally */ | |
| 2190 PNG_EXPORT(98, void, png_free_data, (png_const_structrp png_ptr, | |
| 2191 png_inforp info_ptr, png_uint_32 free_me, int num)); | |
| 2192 | |
| 2193 /* Reassign responsibility for freeing existing data, whether allocated | |
| 2194 * by libpng or by the application; this works on the png_info structure passed | |
| 2195 * in, it does not change the state for other png_info structures. | |
| 2196 * | |
| 2197 * It is unlikely that this function works correctly as of 1.6.0 and using it | |
| 2198 * may result either in memory leaks or double free of allocated data. | |
| 2199 */ | |
| 2200 PNG_EXPORTA(99, void, png_data_freer, (png_const_structrp png_ptr, | |
| 2201 png_inforp info_ptr, int freer, png_uint_32 mask), PNG_DEPRECATED); | |
| 2202 | |
| 2203 /* Assignments for png_data_freer */ | |
| 2204 #define PNG_DESTROY_WILL_FREE_DATA 1 | |
| 2205 #define PNG_SET_WILL_FREE_DATA 1 | |
| 2206 #define PNG_USER_WILL_FREE_DATA 2 | |
| 2207 /* Flags for png_ptr->free_me and info_ptr->free_me */ | |
| 2208 #define PNG_FREE_HIST 0x0008 | |
| 2209 #define PNG_FREE_ICCP 0x0010 | |
| 2210 #define PNG_FREE_SPLT 0x0020 | |
| 2211 #define PNG_FREE_ROWS 0x0040 | |
| 2212 #define PNG_FREE_PCAL 0x0080 | |
| 2213 #define PNG_FREE_SCAL 0x0100 | |
| 2214 #ifdef PNG_STORE_UNKNOWN_CHUNKS_SUPPORTED | |
| 2215 # define PNG_FREE_UNKN 0x0200 | |
| 2216 #endif | |
| 2217 /* PNG_FREE_LIST 0x0400 removed in 1.6.0 because it is ignored */ | |
| 2218 #define PNG_FREE_PLTE 0x1000 | |
| 2219 #define PNG_FREE_TRNS 0x2000 | |
| 2220 #define PNG_FREE_TEXT 0x4000 | |
| 2221 #define PNG_FREE_ALL 0x7fff | |
| 2222 #define PNG_FREE_MUL 0x4220 /* PNG_FREE_SPLT|PNG_FREE_TEXT|PNG_FREE_UNKN */ | |
| 2223 | |
| 2224 #ifdef PNG_USER_MEM_SUPPORTED | |
| 2225 PNG_EXPORTA(100, png_voidp, png_malloc_default, (png_const_structrp png_ptr, | |
| 2226 png_alloc_size_t size), PNG_ALLOCATED PNG_DEPRECATED); | |
| 2227 PNG_EXPORTA(101, void, png_free_default, (png_const_structrp png_ptr, | |
| 2228 png_voidp ptr), PNG_DEPRECATED); | |
| 2229 #endif | |
| 2230 | |
| 2231 #ifdef PNG_ERROR_TEXT_SUPPORTED | |
| 2232 /* Fatal error in PNG image of libpng - can't continue */ | |
| 2233 PNG_EXPORTA(102, void, png_error, (png_const_structrp png_ptr, | |
| 2234 png_const_charp error_message), PNG_NORETURN); | |
| 2235 | |
| 2236 /* The same, but the chunk name is prepended to the error string. */ | |
| 2237 PNG_EXPORTA(103, void, png_chunk_error, (png_const_structrp png_ptr, | |
| 2238 png_const_charp error_message), PNG_NORETURN); | |
| 2239 | |
| 2240 #else | |
| 2241 /* Fatal error in PNG image of libpng - can't continue */ | |
| 2242 PNG_EXPORTA(104, void, png_err, (png_const_structrp png_ptr), PNG_NORETURN); | |
| 2243 #endif | |
| 2244 | |
| 2245 #ifdef PNG_WARNINGS_SUPPORTED | |
| 2246 /* Non-fatal error in libpng. Can continue, but may have a problem. */ | |
| 2247 PNG_EXPORT(105, void, png_warning, (png_const_structrp png_ptr, | |
| 2248 png_const_charp warning_message)); | |
| 2249 | |
| 2250 /* Non-fatal error in libpng, chunk name is prepended to message. */ | |
| 2251 PNG_EXPORT(106, void, png_chunk_warning, (png_const_structrp png_ptr, | |
| 2252 png_const_charp warning_message)); | |
| 2253 #endif | |
| 2254 | |
| 2255 #ifdef PNG_BENIGN_ERRORS_SUPPORTED | |
| 2256 /* Benign error in libpng. Can continue, but may have a problem. | |
| 2257 * User can choose whether to handle as a fatal error or as a warning. */ | |
| 2258 PNG_EXPORT(107, void, png_benign_error, (png_const_structrp png_ptr, | |
| 2259 png_const_charp warning_message)); | |
| 2260 | |
| 2261 #ifdef PNG_READ_SUPPORTED | |
| 2262 /* Same, chunk name is prepended to message (only during read) */ | |
| 2263 PNG_EXPORT(108, void, png_chunk_benign_error, (png_const_structrp png_ptr, | |
| 2264 png_const_charp warning_message)); | |
| 2265 #endif | |
| 2266 | |
| 2267 PNG_EXPORT(109, void, png_set_benign_errors, | |
| 2268 (png_structrp png_ptr, int allowed)); | |
| 2269 #else | |
| 2270 # ifdef PNG_ALLOW_BENIGN_ERRORS | |
| 2271 # define png_benign_error png_warning | |
| 2272 # define png_chunk_benign_error png_chunk_warning | |
| 2273 # else | |
| 2274 # define png_benign_error png_error | |
| 2275 # define png_chunk_benign_error png_chunk_error | |
| 2276 # endif | |
| 2277 #endif | |
| 2278 | |
| 2279 /* The png_set_<chunk> functions are for storing values in the png_info_struct. | |
| 2280 * Similarly, the png_get_<chunk> calls are used to read values from the | |
| 2281 * png_info_struct, either storing the parameters in the passed variables, or | |
| 2282 * setting pointers into the png_info_struct where the data is stored. The | |
| 2283 * png_get_<chunk> functions return a non-zero value if the data was available | |
| 2284 * in info_ptr, or return zero and do not change any of the parameters if the | |
| 2285 * data was not available. | |
| 2286 * | |
| 2287 * These functions should be used instead of directly accessing png_info | |
| 2288 * to avoid problems with future changes in the size and internal layout of | |
| 2289 * png_info_struct. | |
| 2290 */ | |
| 2291 /* Returns "flag" if chunk data is valid in info_ptr. */ | |
| 2292 PNG_EXPORT(110, png_uint_32, png_get_valid, (png_const_structrp png_ptr, | |
| 2293 png_const_inforp info_ptr, png_uint_32 flag)); | |
| 2294 | |
| 2295 /* Returns number of bytes needed to hold a transformed row. */ | |
| 2296 PNG_EXPORT(111, png_size_t, png_get_rowbytes, (png_const_structrp png_ptr, | |
| 2297 png_const_inforp info_ptr)); | |
| 2298 | |
| 2299 #ifdef PNG_INFO_IMAGE_SUPPORTED | |
| 2300 /* Returns row_pointers, which is an array of pointers to scanlines that was | |
| 2301 * returned from png_read_png(). | |
| 2302 */ | |
| 2303 PNG_EXPORT(112, png_bytepp, png_get_rows, (png_const_structrp png_ptr, | |
| 2304 png_const_inforp info_ptr)); | |
| 2305 | |
| 2306 /* Set row_pointers, which is an array of pointers to scanlines for use | |
| 2307 * by png_write_png(). | |
| 2308 */ | |
| 2309 PNG_EXPORT(113, void, png_set_rows, (png_const_structrp png_ptr, | |
| 2310 png_inforp info_ptr, png_bytepp row_pointers)); | |
| 2311 #endif | |
| 2312 | |
| 2313 /* Returns number of color channels in image. */ | |
| 2314 PNG_EXPORT(114, png_byte, png_get_channels, (png_const_structrp png_ptr, | |
| 2315 png_const_inforp info_ptr)); | |
| 2316 | |
| 2317 #ifdef PNG_EASY_ACCESS_SUPPORTED | |
| 2318 /* Returns image width in pixels. */ | |
| 2319 PNG_EXPORT(115, png_uint_32, png_get_image_width, (png_const_structrp png_ptr, | |
| 2320 png_const_inforp info_ptr)); | |
| 2321 | |
| 2322 /* Returns image height in pixels. */ | |
| 2323 PNG_EXPORT(116, png_uint_32, png_get_image_height, (png_const_structrp png_ptr, | |
| 2324 png_const_inforp info_ptr)); | |
| 2325 | |
| 2326 /* Returns image bit_depth. */ | |
| 2327 PNG_EXPORT(117, png_byte, png_get_bit_depth, (png_const_structrp png_ptr, | |
| 2328 png_const_inforp info_ptr)); | |
| 2329 | |
| 2330 /* Returns image color_type. */ | |
| 2331 PNG_EXPORT(118, png_byte, png_get_color_type, (png_const_structrp png_ptr, | |
| 2332 png_const_inforp info_ptr)); | |
| 2333 | |
| 2334 /* Returns image filter_type. */ | |
| 2335 PNG_EXPORT(119, png_byte, png_get_filter_type, (png_const_structrp png_ptr, | |
| 2336 png_const_inforp info_ptr)); | |
| 2337 | |
| 2338 /* Returns image interlace_type. */ | |
| 2339 PNG_EXPORT(120, png_byte, png_get_interlace_type, (png_const_structrp png_ptr, | |
| 2340 png_const_inforp info_ptr)); | |
| 2341 | |
| 2342 /* Returns image compression_type. */ | |
| 2343 PNG_EXPORT(121, png_byte, png_get_compression_type, (png_const_structrp png_ptr, | |
| 2344 png_const_inforp info_ptr)); | |
| 2345 | |
| 2346 /* Returns image resolution in pixels per meter, from pHYs chunk data. */ | |
| 2347 PNG_EXPORT(122, png_uint_32, png_get_pixels_per_meter, | |
| 2348 (png_const_structrp png_ptr, png_const_inforp info_ptr)); | |
| 2349 PNG_EXPORT(123, png_uint_32, png_get_x_pixels_per_meter, | |
| 2350 (png_const_structrp png_ptr, png_const_inforp info_ptr)); | |
| 2351 PNG_EXPORT(124, png_uint_32, png_get_y_pixels_per_meter, | |
| 2352 (png_const_structrp png_ptr, png_const_inforp info_ptr)); | |
| 2353 | |
| 2354 /* Returns pixel aspect ratio, computed from pHYs chunk data. */ | |
| 2355 PNG_FP_EXPORT(125, float, png_get_pixel_aspect_ratio, | |
| 2356 (png_const_structrp png_ptr, png_const_inforp info_ptr)) | |
| 2357 PNG_FIXED_EXPORT(210, png_fixed_point, png_get_pixel_aspect_ratio_fixed, | |
| 2358 (png_const_structrp png_ptr, png_const_inforp info_ptr)) | |
| 2359 | |
| 2360 /* Returns image x, y offset in pixels or microns, from oFFs chunk data. */ | |
| 2361 PNG_EXPORT(126, png_int_32, png_get_x_offset_pixels, | |
| 2362 (png_const_structrp png_ptr, png_const_inforp info_ptr)); | |
| 2363 PNG_EXPORT(127, png_int_32, png_get_y_offset_pixels, | |
| 2364 (png_const_structrp png_ptr, png_const_inforp info_ptr)); | |
| 2365 PNG_EXPORT(128, png_int_32, png_get_x_offset_microns, | |
| 2366 (png_const_structrp png_ptr, png_const_inforp info_ptr)); | |
| 2367 PNG_EXPORT(129, png_int_32, png_get_y_offset_microns, | |
| 2368 (png_const_structrp png_ptr, png_const_inforp info_ptr)); | |
| 2369 | |
| 2370 #endif /* PNG_EASY_ACCESS_SUPPORTED */ | |
| 2371 | |
| 2372 #ifdef PNG_READ_SUPPORTED | |
| 2373 /* Returns pointer to signature string read from PNG header */ | |
| 2374 PNG_EXPORT(130, png_const_bytep, png_get_signature, (png_const_structrp png_ptr, | |
| 2375 png_const_inforp info_ptr)); | |
| 2376 #endif | |
| 2377 | |
| 2378 #ifdef PNG_bKGD_SUPPORTED | |
| 2379 PNG_EXPORT(131, png_uint_32, png_get_bKGD, (png_const_structrp png_ptr, | |
| 2380 png_inforp info_ptr, png_color_16p *background)); | |
| 2381 #endif | |
| 2382 | |
| 2383 #ifdef PNG_bKGD_SUPPORTED | |
| 2384 PNG_EXPORT(132, void, png_set_bKGD, (png_const_structrp png_ptr, | |
| 2385 png_inforp info_ptr, png_const_color_16p background)); | |
| 2386 #endif | |
| 2387 | |
| 2388 #ifdef PNG_cHRM_SUPPORTED | |
| 2389 PNG_FP_EXPORT(133, png_uint_32, png_get_cHRM, (png_const_structrp png_ptr, | |
| 2390 png_const_inforp info_ptr, double *white_x, double *white_y, double *red_x, | |
| 2391 double *red_y, double *green_x, double *green_y, double *blue_x, | |
| 2392 double *blue_y)) | |
| 2393 PNG_FP_EXPORT(230, png_uint_32, png_get_cHRM_XYZ, (png_const_structrp png_ptr, | |
| 2394 png_const_inforp info_ptr, double *red_X, double *red_Y, double *red_Z, | |
| 2395 double *green_X, double *green_Y, double *green_Z, double *blue_X, | |
| 2396 double *blue_Y, double *blue_Z)) | |
| 2397 PNG_FIXED_EXPORT(134, png_uint_32, png_get_cHRM_fixed, | |
| 2398 (png_const_structrp png_ptr, png_const_inforp info_ptr, | |
| 2399 png_fixed_point *int_white_x, png_fixed_point *int_white_y, | |
| 2400 png_fixed_point *int_red_x, png_fixed_point *int_red_y, | |
| 2401 png_fixed_point *int_green_x, png_fixed_point *int_green_y, | |
| 2402 png_fixed_point *int_blue_x, png_fixed_point *int_blue_y)) | |
| 2403 PNG_FIXED_EXPORT(231, png_uint_32, png_get_cHRM_XYZ_fixed, | |
| 2404 (png_const_structrp png_ptr, png_const_inforp info_ptr, | |
| 2405 png_fixed_point *int_red_X, png_fixed_point *int_red_Y, | |
| 2406 png_fixed_point *int_red_Z, png_fixed_point *int_green_X, | |
| 2407 png_fixed_point *int_green_Y, png_fixed_point *int_green_Z, | |
| 2408 png_fixed_point *int_blue_X, png_fixed_point *int_blue_Y, | |
| 2409 png_fixed_point *int_blue_Z)) | |
| 2410 #endif | |
| 2411 | |
| 2412 #ifdef PNG_cHRM_SUPPORTED | |
| 2413 PNG_FP_EXPORT(135, void, png_set_cHRM, (png_const_structrp png_ptr, | |
| 2414 png_inforp info_ptr, | |
| 2415 double white_x, double white_y, double red_x, double red_y, double green_x, | |
| 2416 double green_y, double blue_x, double blue_y)) | |
| 2417 PNG_FP_EXPORT(232, void, png_set_cHRM_XYZ, (png_const_structrp png_ptr, | |
| 2418 png_inforp info_ptr, double red_X, double red_Y, double red_Z, | |
| 2419 double green_X, double green_Y, double green_Z, double blue_X, | |
| 2420 double blue_Y, double blue_Z)) | |
| 2421 PNG_FIXED_EXPORT(136, void, png_set_cHRM_fixed, (png_const_structrp png_ptr, | |
| 2422 png_inforp info_ptr, png_fixed_point int_white_x, | |
| 2423 png_fixed_point int_white_y, png_fixed_point int_red_x, | |
| 2424 png_fixed_point int_red_y, png_fixed_point int_green_x, | |
| 2425 png_fixed_point int_green_y, png_fixed_point int_blue_x, | |
| 2426 png_fixed_point int_blue_y)) | |
| 2427 PNG_FIXED_EXPORT(233, void, png_set_cHRM_XYZ_fixed, (png_const_structrp png_ptr, | |
| 2428 png_inforp info_ptr, png_fixed_point int_red_X, png_fixed_point int_red_Y, | |
| 2429 png_fixed_point int_red_Z, png_fixed_point int_green_X, | |
| 2430 png_fixed_point int_green_Y, png_fixed_point int_green_Z, | |
| 2431 png_fixed_point int_blue_X, png_fixed_point int_blue_Y, | |
| 2432 png_fixed_point int_blue_Z)) | |
| 2433 #endif | |
| 2434 | |
| 2435 #ifdef PNG_gAMA_SUPPORTED | |
| 2436 PNG_FP_EXPORT(137, png_uint_32, png_get_gAMA, (png_const_structrp png_ptr, | |
| 2437 png_const_inforp info_ptr, double *file_gamma)) | |
| 2438 PNG_FIXED_EXPORT(138, png_uint_32, png_get_gAMA_fixed, | |
| 2439 (png_const_structrp png_ptr, png_const_inforp info_ptr, | |
| 2440 png_fixed_point *int_file_gamma)) | |
| 2441 #endif | |
| 2442 | |
| 2443 #ifdef PNG_gAMA_SUPPORTED | |
| 2444 PNG_FP_EXPORT(139, void, png_set_gAMA, (png_const_structrp png_ptr, | |
| 2445 png_inforp info_ptr, double file_gamma)) | |
| 2446 PNG_FIXED_EXPORT(140, void, png_set_gAMA_fixed, (png_const_structrp png_ptr, | |
| 2447 png_inforp info_ptr, png_fixed_point int_file_gamma)) | |
| 2448 #endif | |
| 2449 | |
| 2450 #ifdef PNG_hIST_SUPPORTED | |
| 2451 PNG_EXPORT(141, png_uint_32, png_get_hIST, (png_const_structrp png_ptr, | |
| 2452 png_inforp info_ptr, png_uint_16p *hist)); | |
| 2453 #endif | |
| 2454 | |
| 2455 #ifdef PNG_hIST_SUPPORTED | |
| 2456 PNG_EXPORT(142, void, png_set_hIST, (png_const_structrp png_ptr, | |
| 2457 png_inforp info_ptr, png_const_uint_16p hist)); | |
| 2458 #endif | |
| 2459 | |
| 2460 PNG_EXPORT(143, png_uint_32, png_get_IHDR, (png_const_structrp png_ptr, | |
| 2461 png_const_inforp info_ptr, png_uint_32 *width, png_uint_32 *height, | |
| 2462 int *bit_depth, int *color_type, int *interlace_method, | |
| 2463 int *compression_method, int *filter_method)); | |
| 2464 | |
| 2465 PNG_EXPORT(144, void, png_set_IHDR, (png_const_structrp png_ptr, | |
| 2466 png_inforp info_ptr, png_uint_32 width, png_uint_32 height, int bit_depth, | |
| 2467 int color_type, int interlace_method, int compression_method, | |
| 2468 int filter_method)); | |
| 2469 | |
| 2470 #ifdef PNG_oFFs_SUPPORTED | |
| 2471 PNG_EXPORT(145, png_uint_32, png_get_oFFs, (png_const_structrp png_ptr, | |
| 2472 png_const_inforp info_ptr, png_int_32 *offset_x, png_int_32 *offset_y, | |
| 2473 int *unit_type)); | |
| 2474 #endif | |
| 2475 | |
| 2476 #ifdef PNG_oFFs_SUPPORTED | |
| 2477 PNG_EXPORT(146, void, png_set_oFFs, (png_const_structrp png_ptr, | |
| 2478 png_inforp info_ptr, png_int_32 offset_x, png_int_32 offset_y, | |
| 2479 int unit_type)); | |
| 2480 #endif | |
| 2481 | |
| 2482 #ifdef PNG_pCAL_SUPPORTED | |
| 2483 PNG_EXPORT(147, png_uint_32, png_get_pCAL, (png_const_structrp png_ptr, | |
| 2484 png_inforp info_ptr, png_charp *purpose, png_int_32 *X0, | |
| 2485 png_int_32 *X1, int *type, int *nparams, png_charp *units, | |
| 2486 png_charpp *params)); | |
| 2487 #endif | |
| 2488 | |
| 2489 #ifdef PNG_pCAL_SUPPORTED | |
| 2490 PNG_EXPORT(148, void, png_set_pCAL, (png_const_structrp png_ptr, | |
| 2491 png_inforp info_ptr, png_const_charp purpose, png_int_32 X0, png_int_32 X1, | |
| 2492 int type, int nparams, png_const_charp units, png_charpp params)); | |
| 2493 #endif | |
| 2494 | |
| 2495 #ifdef PNG_pHYs_SUPPORTED | |
| 2496 PNG_EXPORT(149, png_uint_32, png_get_pHYs, (png_const_structrp png_ptr, | |
| 2497 png_const_inforp info_ptr, png_uint_32 *res_x, png_uint_32 *res_y, | |
| 2498 int *unit_type)); | |
| 2499 #endif | |
| 2500 | |
| 2501 #ifdef PNG_pHYs_SUPPORTED | |
| 2502 PNG_EXPORT(150, void, png_set_pHYs, (png_const_structrp png_ptr, | |
| 2503 png_inforp info_ptr, png_uint_32 res_x, png_uint_32 res_y, int unit_type)); | |
| 2504 #endif | |
| 2505 | |
| 2506 PNG_EXPORT(151, png_uint_32, png_get_PLTE, (png_const_structrp png_ptr, | |
| 2507 png_inforp info_ptr, png_colorp *palette, int *num_palette)); | |
| 2508 | |
| 2509 PNG_EXPORT(152, void, png_set_PLTE, (png_structrp png_ptr, | |
| 2510 png_inforp info_ptr, png_const_colorp palette, int num_palette)); | |
| 2511 | |
| 2512 #ifdef PNG_sBIT_SUPPORTED | |
| 2513 PNG_EXPORT(153, png_uint_32, png_get_sBIT, (png_const_structrp png_ptr, | |
| 2514 png_inforp info_ptr, png_color_8p *sig_bit)); | |
| 2515 #endif | |
| 2516 | |
| 2517 #ifdef PNG_sBIT_SUPPORTED | |
| 2518 PNG_EXPORT(154, void, png_set_sBIT, (png_const_structrp png_ptr, | |
| 2519 png_inforp info_ptr, png_const_color_8p sig_bit)); | |
| 2520 #endif | |
| 2521 | |
| 2522 #ifdef PNG_sRGB_SUPPORTED | |
| 2523 PNG_EXPORT(155, png_uint_32, png_get_sRGB, (png_const_structrp png_ptr, | |
| 2524 png_const_inforp info_ptr, int *file_srgb_intent)); | |
| 2525 #endif | |
| 2526 | |
| 2527 #ifdef PNG_sRGB_SUPPORTED | |
| 2528 PNG_EXPORT(156, void, png_set_sRGB, (png_const_structrp png_ptr, | |
| 2529 png_inforp info_ptr, int srgb_intent)); | |
| 2530 PNG_EXPORT(157, void, png_set_sRGB_gAMA_and_cHRM, (png_const_structrp png_ptr, | |
| 2531 png_inforp info_ptr, int srgb_intent)); | |
| 2532 #endif | |
| 2533 | |
| 2534 #ifdef PNG_iCCP_SUPPORTED | |
| 2535 PNG_EXPORT(158, png_uint_32, png_get_iCCP, (png_const_structrp png_ptr, | |
| 2536 png_inforp info_ptr, png_charpp name, int *compression_type, | |
| 2537 png_bytepp profile, png_uint_32 *proflen)); | |
| 2538 #endif | |
| 2539 | |
| 2540 #ifdef PNG_iCCP_SUPPORTED | |
| 2541 PNG_EXPORT(159, void, png_set_iCCP, (png_const_structrp png_ptr, | |
| 2542 png_inforp info_ptr, png_const_charp name, int compression_type, | |
| 2543 png_const_bytep profile, png_uint_32 proflen)); | |
| 2544 #endif | |
| 2545 | |
| 2546 #ifdef PNG_sPLT_SUPPORTED | |
| 2547 PNG_EXPORT(160, int, png_get_sPLT, (png_const_structrp png_ptr, | |
| 2548 png_inforp info_ptr, png_sPLT_tpp entries)); | |
| 2549 #endif | |
| 2550 | |
| 2551 #ifdef PNG_sPLT_SUPPORTED | |
| 2552 PNG_EXPORT(161, void, png_set_sPLT, (png_const_structrp png_ptr, | |
| 2553 png_inforp info_ptr, png_const_sPLT_tp entries, int nentries)); | |
| 2554 #endif | |
| 2555 | |
| 2556 #ifdef PNG_TEXT_SUPPORTED | |
| 2557 /* png_get_text also returns the number of text chunks in *num_text */ | |
| 2558 PNG_EXPORT(162, int, png_get_text, (png_const_structrp png_ptr, | |
| 2559 png_inforp info_ptr, png_textp *text_ptr, int *num_text)); | |
| 2560 #endif | |
| 2561 | |
| 2562 /* Note while png_set_text() will accept a structure whose text, | |
| 2563 * language, and translated keywords are NULL pointers, the structure | |
| 2564 * returned by png_get_text will always contain regular | |
| 2565 * zero-terminated C strings. They might be empty strings but | |
| 2566 * they will never be NULL pointers. | |
| 2567 */ | |
| 2568 | |
| 2569 #ifdef PNG_TEXT_SUPPORTED | |
| 2570 PNG_EXPORT(163, void, png_set_text, (png_const_structrp png_ptr, | |
| 2571 png_inforp info_ptr, png_const_textp text_ptr, int num_text)); | |
| 2572 #endif | |
| 2573 | |
| 2574 #ifdef PNG_tIME_SUPPORTED | |
| 2575 PNG_EXPORT(164, png_uint_32, png_get_tIME, (png_const_structrp png_ptr, | |
| 2576 png_inforp info_ptr, png_timep *mod_time)); | |
| 2577 #endif | |
| 2578 | |
| 2579 #ifdef PNG_tIME_SUPPORTED | |
| 2580 PNG_EXPORT(165, void, png_set_tIME, (png_const_structrp png_ptr, | |
| 2581 png_inforp info_ptr, png_const_timep mod_time)); | |
| 2582 #endif | |
| 2583 | |
| 2584 #ifdef PNG_tRNS_SUPPORTED | |
| 2585 PNG_EXPORT(166, png_uint_32, png_get_tRNS, (png_const_structrp png_ptr, | |
| 2586 png_inforp info_ptr, png_bytep *trans_alpha, int *num_trans, | |
| 2587 png_color_16p *trans_color)); | |
| 2588 #endif | |
| 2589 | |
| 2590 #ifdef PNG_tRNS_SUPPORTED | |
| 2591 PNG_EXPORT(167, void, png_set_tRNS, (png_structrp png_ptr, | |
| 2592 png_inforp info_ptr, png_const_bytep trans_alpha, int num_trans, | |
| 2593 png_const_color_16p trans_color)); | |
| 2594 #endif | |
| 2595 | |
| 2596 #ifdef PNG_sCAL_SUPPORTED | |
| 2597 PNG_FP_EXPORT(168, png_uint_32, png_get_sCAL, (png_const_structrp png_ptr, | |
| 2598 png_const_inforp info_ptr, int *unit, double *width, double *height)) | |
| 2599 #if defined(PNG_FLOATING_ARITHMETIC_SUPPORTED) || \ | |
| 2600 defined(PNG_FLOATING_POINT_SUPPORTED) | |
| 2601 /* NOTE: this API is currently implemented using floating point arithmetic, | |
| 2602 * consequently it can only be used on systems with floating point support. | |
| 2603 * In any case the range of values supported by png_fixed_point is small and it | |
| 2604 * is highly recommended that png_get_sCAL_s be used instead. | |
| 2605 */ | |
| 2606 PNG_FIXED_EXPORT(214, png_uint_32, png_get_sCAL_fixed, | |
| 2607 (png_const_structrp png_ptr, png_const_inforp info_ptr, int *unit, | |
| 2608 png_fixed_point *width, png_fixed_point *height)) | |
| 2609 #endif | |
| 2610 PNG_EXPORT(169, png_uint_32, png_get_sCAL_s, | |
| 2611 (png_const_structrp png_ptr, png_const_inforp info_ptr, int *unit, | |
| 2612 png_charpp swidth, png_charpp sheight)); | |
| 2613 | |
| 2614 PNG_FP_EXPORT(170, void, png_set_sCAL, (png_const_structrp png_ptr, | |
| 2615 png_inforp info_ptr, int unit, double width, double height)) | |
| 2616 PNG_FIXED_EXPORT(213, void, png_set_sCAL_fixed, (png_const_structrp png_ptr, | |
| 2617 png_inforp info_ptr, int unit, png_fixed_point width, | |
| 2618 png_fixed_point height)) | |
| 2619 PNG_EXPORT(171, void, png_set_sCAL_s, (png_const_structrp png_ptr, | |
| 2620 png_inforp info_ptr, int unit, | |
| 2621 png_const_charp swidth, png_const_charp sheight)); | |
| 2622 #endif /* PNG_sCAL_SUPPORTED */ | |
| 2623 | |
| 2624 #ifdef PNG_SET_UNKNOWN_CHUNKS_SUPPORTED | |
| 2625 /* Provide the default handling for all unknown chunks or, optionally, for | |
| 2626 * specific unknown chunks. | |
| 2627 * | |
| 2628 * NOTE: prior to 1.6.0 the handling specified for particular chunks on read was | |
| 2629 * ignored and the default was used, the per-chunk setting only had an effect on | |
| 2630 * write. If you wish to have chunk-specific handling on read in code that must | |
| 2631 * work on earlier versions you must use a user chunk callback to specify the | |
| 2632 * desired handling (keep or discard.) | |
| 2633 * | |
| 2634 * The 'keep' parameter is a PNG_HANDLE_CHUNK_ value as listed below. The | |
| 2635 * parameter is interpreted as follows: | |
| 2636 * | |
| 2637 * READ: | |
| 2638 * PNG_HANDLE_CHUNK_AS_DEFAULT: | |
| 2639 * Known chunks: do normal libpng processing, do not keep the chunk (but | |
| 2640 * see the comments below about PNG_HANDLE_AS_UNKNOWN_SUPPORTED) | |
| 2641 * Unknown chunks: for a specific chunk use the global default, when used | |
| 2642 * as the default discard the chunk data. | |
| 2643 * PNG_HANDLE_CHUNK_NEVER: | |
| 2644 * Discard the chunk data. | |
| 2645 * PNG_HANDLE_CHUNK_IF_SAFE: | |
| 2646 * Keep the chunk data if the chunk is not critical else raise a chunk | |
| 2647 * error. | |
| 2648 * PNG_HANDLE_CHUNK_ALWAYS: | |
| 2649 * Keep the chunk data. | |
| 2650 * | |
| 2651 * If the chunk data is saved it can be retrieved using png_get_unknown_chunks, | |
| 2652 * below. Notice that specifying "AS_DEFAULT" as a global default is equivalent | |
| 2653 * to specifying "NEVER", however when "AS_DEFAULT" is used for specific chunks | |
| 2654 * it simply resets the behavior to the libpng default. | |
| 2655 * | |
| 2656 * INTERACTION WTIH USER CHUNK CALLBACKS: | |
| 2657 * The per-chunk handling is always used when there is a png_user_chunk_ptr | |
| 2658 * callback and the callback returns 0; the chunk is then always stored *unless* | |
| 2659 * it is critical and the per-chunk setting is other than ALWAYS. Notice that | |
| 2660 * the global default is *not* used in this case. (In effect the per-chunk | |
| 2661 * value is incremented to at least IF_SAFE.) | |
| 2662 * | |
| 2663 * IMPORTANT NOTE: this behavior will change in libpng 1.7 - the global and | |
| 2664 * per-chunk defaults will be honored. If you want to preserve the current | |
| 2665 * behavior when your callback returns 0 you must set PNG_HANDLE_CHUNK_IF_SAFE | |
| 2666 * as the default - if you don't do this libpng 1.6 will issue a warning. | |
| 2667 * | |
| 2668 * If you want unhandled unknown chunks to be discarded in libpng 1.6 and | |
| 2669 * earlier simply return '1' (handled). | |
| 2670 * | |
| 2671 * PNG_HANDLE_AS_UNKNOWN_SUPPORTED: | |
| 2672 * If this is *not* set known chunks will always be handled by libpng and | |
| 2673 * will never be stored in the unknown chunk list. Known chunks listed to | |
| 2674 * png_set_keep_unknown_chunks will have no effect. If it is set then known | |
| 2675 * chunks listed with a keep other than AS_DEFAULT will *never* be processed | |
| 2676 * by libpng, in addition critical chunks must either be processed by the | |
| 2677 * callback or saved. | |
| 2678 * | |
| 2679 * The IHDR and IEND chunks must not be listed. Because this turns off the | |
| 2680 * default handling for chunks that would otherwise be recognized the | |
| 2681 * behavior of libpng transformations may well become incorrect! | |
| 2682 * | |
| 2683 * WRITE: | |
| 2684 * When writing chunks the options only apply to the chunks specified by | |
| 2685 * png_set_unknown_chunks (below), libpng will *always* write known chunks | |
| 2686 * required by png_set_ calls and will always write the core critical chunks | |
| 2687 * (as required for PLTE). | |
| 2688 * | |
| 2689 * Each chunk in the png_set_unknown_chunks list is looked up in the | |
| 2690 * png_set_keep_unknown_chunks list to find the keep setting, this is then | |
| 2691 * interpreted as follows: | |
| 2692 * | |
| 2693 * PNG_HANDLE_CHUNK_AS_DEFAULT: | |
| 2694 * Write safe-to-copy chunks and write other chunks if the global | |
| 2695 * default is set to _ALWAYS, otherwise don't write this chunk. | |
| 2696 * PNG_HANDLE_CHUNK_NEVER: | |
| 2697 * Do not write the chunk. | |
| 2698 * PNG_HANDLE_CHUNK_IF_SAFE: | |
| 2699 * Write the chunk if it is safe-to-copy, otherwise do not write it. | |
| 2700 * PNG_HANDLE_CHUNK_ALWAYS: | |
| 2701 * Write the chunk. | |
| 2702 * | |
| 2703 * Note that the default behavior is effectively the opposite of the read case - | |
| 2704 * in read unknown chunks are not stored by default, in write they are written | |
| 2705 * by default. Also the behavior of PNG_HANDLE_CHUNK_IF_SAFE is very different | |
| 2706 * - on write the safe-to-copy bit is checked, on read the critical bit is | |
| 2707 * checked and on read if the chunk is critical an error will be raised. | |
| 2708 * | |
| 2709 * num_chunks: | |
| 2710 * =========== | |
| 2711 * If num_chunks is positive, then the "keep" parameter specifies the manner | |
| 2712 * for handling only those chunks appearing in the chunk_list array, | |
| 2713 * otherwise the chunk list array is ignored. | |
| 2714 * | |
| 2715 * If num_chunks is 0 the "keep" parameter specifies the default behavior for | |
| 2716 * unknown chunks, as described above. | |
| 2717 * | |
| 2718 * If num_chunks is negative, then the "keep" parameter specifies the manner | |
| 2719 * for handling all unknown chunks plus all chunks recognized by libpng | |
| 2720 * except for the IHDR, PLTE, tRNS, IDAT, and IEND chunks (which continue to | |
| 2721 * be processed by libpng. | |
| 2722 */ | |
| 2723 PNG_EXPORT(172, void, png_set_keep_unknown_chunks, (png_structrp png_ptr, | |
| 2724 int keep, png_const_bytep chunk_list, int num_chunks)); | |
| 2725 | |
| 2726 /* The "keep" PNG_HANDLE_CHUNK_ parameter for the specified chunk is returned; | |
| 2727 * the result is therefore true (non-zero) if special handling is required, | |
| 2728 * false for the default handling. | |
| 2729 */ | |
| 2730 PNG_EXPORT(173, int, png_handle_as_unknown, (png_const_structrp png_ptr, | |
| 2731 png_const_bytep chunk_name)); | |
| 2732 #endif | |
| 2733 | |
| 2734 #ifdef PNG_STORE_UNKNOWN_CHUNKS_SUPPORTED | |
| 2735 PNG_EXPORT(174, void, png_set_unknown_chunks, (png_const_structrp png_ptr, | |
| 2736 png_inforp info_ptr, png_const_unknown_chunkp unknowns, | |
| 2737 int num_unknowns)); | |
| 2738 /* NOTE: prior to 1.6.0 this routine set the 'location' field of the added | |
| 2739 * unknowns to the location currently stored in the png_struct. This is | |
| 2740 * invariably the wrong value on write. To fix this call the following API | |
| 2741 * for each chunk in the list with the correct location. If you know your | |
| 2742 * code won't be compiled on earlier versions you can rely on | |
| 2743 * png_set_unknown_chunks(write-ptr, png_get_unknown_chunks(read-ptr)) doing | |
| 2744 * the correct thing. | |
| 2745 */ | |
| 2746 | |
| 2747 PNG_EXPORT(175, void, png_set_unknown_chunk_location, | |
| 2748 (png_const_structrp png_ptr, png_inforp info_ptr, int chunk, int location)); | |
| 2749 | |
| 2750 PNG_EXPORT(176, int, png_get_unknown_chunks, (png_const_structrp png_ptr, | |
| 2751 png_inforp info_ptr, png_unknown_chunkpp entries)); | |
| 2752 #endif | |
| 2753 | |
| 2754 /* Png_free_data() will turn off the "valid" flag for anything it frees. | |
| 2755 * If you need to turn it off for a chunk that your application has freed, | |
| 2756 * you can use png_set_invalid(png_ptr, info_ptr, PNG_INFO_CHNK); | |
| 2757 */ | |
| 2758 PNG_EXPORT(177, void, png_set_invalid, (png_const_structrp png_ptr, | |
| 2759 png_inforp info_ptr, int mask)); | |
| 2760 | |
| 2761 #ifdef PNG_INFO_IMAGE_SUPPORTED | |
| 2762 /* The "params" pointer is currently not used and is for future expansion. */ | |
| 2763 PNG_EXPORT(178, void, png_read_png, (png_structrp png_ptr, png_inforp info_ptr, | |
| 2764 int transforms, png_voidp params)); | |
| 2765 PNG_EXPORT(179, void, png_write_png, (png_structrp png_ptr, png_inforp info_ptr, | |
| 2766 int transforms, png_voidp params)); | |
| 2767 #endif | |
| 2768 | |
| 2769 PNG_EXPORT(180, png_const_charp, png_get_copyright, | |
| 2770 (png_const_structrp png_ptr)); | |
| 2771 PNG_EXPORT(181, png_const_charp, png_get_header_ver, | |
| 2772 (png_const_structrp png_ptr)); | |
| 2773 PNG_EXPORT(182, png_const_charp, png_get_header_version, | |
| 2774 (png_const_structrp png_ptr)); | |
| 2775 PNG_EXPORT(183, png_const_charp, png_get_libpng_ver, | |
| 2776 (png_const_structrp png_ptr)); | |
| 2777 | |
| 2778 #ifdef PNG_MNG_FEATURES_SUPPORTED | |
| 2779 PNG_EXPORT(184, png_uint_32, png_permit_mng_features, (png_structrp png_ptr, | |
| 2780 png_uint_32 mng_features_permitted)); | |
| 2781 #endif | |
| 2782 | |
| 2783 /* For use in png_set_keep_unknown, added to version 1.2.6 */ | |
| 2784 #define PNG_HANDLE_CHUNK_AS_DEFAULT 0 | |
| 2785 #define PNG_HANDLE_CHUNK_NEVER 1 | |
| 2786 #define PNG_HANDLE_CHUNK_IF_SAFE 2 | |
| 2787 #define PNG_HANDLE_CHUNK_ALWAYS 3 | |
| 2788 #define PNG_HANDLE_CHUNK_LAST 4 | |
| 2789 | |
| 2790 /* Strip the prepended error numbers ("#nnn ") from error and warning | |
| 2791 * messages before passing them to the error or warning handler. | |
| 2792 */ | |
| 2793 #ifdef PNG_ERROR_NUMBERS_SUPPORTED | |
| 2794 PNG_EXPORT(185, void, png_set_strip_error_numbers, (png_structrp png_ptr, | |
| 2795 png_uint_32 strip_mode)); | |
| 2796 #endif | |
| 2797 | |
| 2798 /* Added in libpng-1.2.6 */ | |
| 2799 #ifdef PNG_SET_USER_LIMITS_SUPPORTED | |
| 2800 PNG_EXPORT(186, void, png_set_user_limits, (png_structrp png_ptr, | |
| 2801 png_uint_32 user_width_max, png_uint_32 user_height_max)); | |
| 2802 PNG_EXPORT(187, png_uint_32, png_get_user_width_max, | |
| 2803 (png_const_structrp png_ptr)); | |
| 2804 PNG_EXPORT(188, png_uint_32, png_get_user_height_max, | |
| 2805 (png_const_structrp png_ptr)); | |
| 2806 /* Added in libpng-1.4.0 */ | |
| 2807 PNG_EXPORT(189, void, png_set_chunk_cache_max, (png_structrp png_ptr, | |
| 2808 png_uint_32 user_chunk_cache_max)); | |
| 2809 PNG_EXPORT(190, png_uint_32, png_get_chunk_cache_max, | |
| 2810 (png_const_structrp png_ptr)); | |
| 2811 /* Added in libpng-1.4.1 */ | |
| 2812 PNG_EXPORT(191, void, png_set_chunk_malloc_max, (png_structrp png_ptr, | |
| 2813 png_alloc_size_t user_chunk_cache_max)); | |
| 2814 PNG_EXPORT(192, png_alloc_size_t, png_get_chunk_malloc_max, | |
| 2815 (png_const_structrp png_ptr)); | |
| 2816 #endif | |
| 2817 | |
| 2818 #if defined(PNG_INCH_CONVERSIONS_SUPPORTED) | |
| 2819 PNG_EXPORT(193, png_uint_32, png_get_pixels_per_inch, | |
| 2820 (png_const_structrp png_ptr, png_const_inforp info_ptr)); | |
| 2821 | |
| 2822 PNG_EXPORT(194, png_uint_32, png_get_x_pixels_per_inch, | |
| 2823 (png_const_structrp png_ptr, png_const_inforp info_ptr)); | |
| 2824 | |
| 2825 PNG_EXPORT(195, png_uint_32, png_get_y_pixels_per_inch, | |
| 2826 (png_const_structrp png_ptr, png_const_inforp info_ptr)); | |
| 2827 | |
| 2828 PNG_FP_EXPORT(196, float, png_get_x_offset_inches, | |
| 2829 (png_const_structrp png_ptr, png_const_inforp info_ptr)) | |
| 2830 #ifdef PNG_FIXED_POINT_SUPPORTED /* otherwise not implemented. */ | |
| 2831 PNG_FIXED_EXPORT(211, png_fixed_point, png_get_x_offset_inches_fixed, | |
| 2832 (png_const_structrp png_ptr, png_const_inforp info_ptr)) | |
| 2833 #endif | |
| 2834 | |
| 2835 PNG_FP_EXPORT(197, float, png_get_y_offset_inches, (png_const_structrp png_ptr, | |
| 2836 png_const_inforp info_ptr)) | |
| 2837 #ifdef PNG_FIXED_POINT_SUPPORTED /* otherwise not implemented. */ | |
| 2838 PNG_FIXED_EXPORT(212, png_fixed_point, png_get_y_offset_inches_fixed, | |
| 2839 (png_const_structrp png_ptr, png_const_inforp info_ptr)) | |
| 2840 #endif | |
| 2841 | |
| 2842 # ifdef PNG_pHYs_SUPPORTED | |
| 2843 PNG_EXPORT(198, png_uint_32, png_get_pHYs_dpi, (png_const_structrp png_ptr, | |
| 2844 png_const_inforp info_ptr, png_uint_32 *res_x, png_uint_32 *res_y, | |
| 2845 int *unit_type)); | |
| 2846 # endif /* PNG_pHYs_SUPPORTED */ | |
| 2847 #endif /* PNG_INCH_CONVERSIONS_SUPPORTED */ | |
| 2848 | |
| 2849 /* Added in libpng-1.4.0 */ | |
| 2850 #ifdef PNG_IO_STATE_SUPPORTED | |
| 2851 PNG_EXPORT(199, png_uint_32, png_get_io_state, (png_const_structrp png_ptr)); | |
| 2852 | |
| 2853 /* Removed from libpng 1.6; use png_get_io_chunk_type. */ | |
| 2854 PNG_REMOVED(200, png_const_bytep, png_get_io_chunk_name, (png_structrp png_ptr), | |
| 2855 PNG_DEPRECATED) | |
| 2856 | |
| 2857 PNG_EXPORT(216, png_uint_32, png_get_io_chunk_type, | |
| 2858 (png_const_structrp png_ptr)); | |
| 2859 | |
| 2860 /* The flags returned by png_get_io_state() are the following: */ | |
| 2861 # define PNG_IO_NONE 0x0000 /* no I/O at this moment */ | |
| 2862 # define PNG_IO_READING 0x0001 /* currently reading */ | |
| 2863 # define PNG_IO_WRITING 0x0002 /* currently writing */ | |
| 2864 # define PNG_IO_SIGNATURE 0x0010 /* currently at the file signature */ | |
| 2865 # define PNG_IO_CHUNK_HDR 0x0020 /* currently at the chunk header */ | |
| 2866 # define PNG_IO_CHUNK_DATA 0x0040 /* currently at the chunk data */ | |
| 2867 # define PNG_IO_CHUNK_CRC 0x0080 /* currently at the chunk crc */ | |
| 2868 # define PNG_IO_MASK_OP 0x000f /* current operation: reading/writing */ | |
| 2869 # define PNG_IO_MASK_LOC 0x00f0 /* current location: sig/hdr/data/crc */ | |
| 2870 #endif /* ?PNG_IO_STATE_SUPPORTED */ | |
| 2871 | |
| 2872 /* Interlace support. The following macros are always defined so that if | |
| 2873 * libpng interlace handling is turned off the macros may be used to handle | |
| 2874 * interlaced images within the application. | |
| 2875 */ | |
| 2876 #define PNG_INTERLACE_ADAM7_PASSES 7 | |
| 2877 | |
| 2878 /* Two macros to return the first row and first column of the original, | |
| 2879 * full, image which appears in a given pass. 'pass' is in the range 0 | |
| 2880 * to 6 and the result is in the range 0 to 7. | |
| 2881 */ | |
| 2882 #define PNG_PASS_START_ROW(pass) (((1&~(pass))<<(3-((pass)>>1)))&7) | |
| 2883 #define PNG_PASS_START_COL(pass) (((1& (pass))<<(3-(((pass)+1)>>1)))&7) | |
| 2884 | |
| 2885 /* A macro to return the offset between pixels in the output row for a pair of | |
| 2886 * pixels in the input - effectively the inverse of the 'COL_SHIFT' macro that | |
| 2887 * follows. Note that ROW_OFFSET is the offset from one row to the next whereas | |
| 2888 * COL_OFFSET is from one column to the next, within a row. | |
| 2889 */ | |
| 2890 #define PNG_PASS_ROW_OFFSET(pass) ((pass)>2?(8>>(((pass)-1)>>1)):8) | |
| 2891 #define PNG_PASS_COL_OFFSET(pass) (1<<((7-(pass))>>1)) | |
| 2892 | |
| 2893 /* Two macros to help evaluate the number of rows or columns in each | |
| 2894 * pass. This is expressed as a shift - effectively log2 of the number or | |
| 2895 * rows or columns in each 8x8 tile of the original image. | |
| 2896 */ | |
| 2897 #define PNG_PASS_ROW_SHIFT(pass) ((pass)>2?(8-(pass))>>1:3) | |
| 2898 #define PNG_PASS_COL_SHIFT(pass) ((pass)>1?(7-(pass))>>1:3) | |
| 2899 | |
| 2900 /* Hence two macros to determine the number of rows or columns in a given | |
| 2901 * pass of an image given its height or width. In fact these macros may | |
| 2902 * return non-zero even though the sub-image is empty, because the other | |
| 2903 * dimension may be empty for a small image. | |
| 2904 */ | |
| 2905 #define PNG_PASS_ROWS(height, pass) (((height)+(((1<<PNG_PASS_ROW_SHIFT(pass))\ | |
| 2906 -1)-PNG_PASS_START_ROW(pass)))>>PNG_PASS_ROW_SHIFT(pass)) | |
| 2907 #define PNG_PASS_COLS(width, pass) (((width)+(((1<<PNG_PASS_COL_SHIFT(pass))\ | |
| 2908 -1)-PNG_PASS_START_COL(pass)))>>PNG_PASS_COL_SHIFT(pass)) | |
| 2909 | |
| 2910 /* For the reader row callbacks (both progressive and sequential) it is | |
| 2911 * necessary to find the row in the output image given a row in an interlaced | |
| 2912 * image, so two more macros: | |
| 2913 */ | |
| 2914 #define PNG_ROW_FROM_PASS_ROW(y_in, pass) \ | |
| 2915 (((y_in)<<PNG_PASS_ROW_SHIFT(pass))+PNG_PASS_START_ROW(pass)) | |
| 2916 #define PNG_COL_FROM_PASS_COL(x_in, pass) \ | |
| 2917 (((x_in)<<PNG_PASS_COL_SHIFT(pass))+PNG_PASS_START_COL(pass)) | |
| 2918 | |
| 2919 /* Two macros which return a boolean (0 or 1) saying whether the given row | |
| 2920 * or column is in a particular pass. These use a common utility macro that | |
| 2921 * returns a mask for a given pass - the offset 'off' selects the row or | |
| 2922 * column version. The mask has the appropriate bit set for each column in | |
| 2923 * the tile. | |
| 2924 */ | |
| 2925 #define PNG_PASS_MASK(pass,off) ( \ | |
| 2926 ((0x110145AF>>(((7-(off))-(pass))<<2)) & 0xF) | \ | |
| 2927 ((0x01145AF0>>(((7-(off))-(pass))<<2)) & 0xF0)) | |
| 2928 | |
| 2929 #define PNG_ROW_IN_INTERLACE_PASS(y, pass) \ | |
| 2930 ((PNG_PASS_MASK(pass,0) >> ((y)&7)) & 1) | |
| 2931 #define PNG_COL_IN_INTERLACE_PASS(x, pass) \ | |
| 2932 ((PNG_PASS_MASK(pass,1) >> ((x)&7)) & 1) | |
| 2933 | |
| 2934 #ifdef PNG_READ_COMPOSITE_NODIV_SUPPORTED | |
| 2935 /* With these routines we avoid an integer divide, which will be slower on | |
| 2936 * most machines. However, it does take more operations than the corresponding | |
| 2937 * divide method, so it may be slower on a few RISC systems. There are two | |
| 2938 * shifts (by 8 or 16 bits) and an addition, versus a single integer divide. | |
| 2939 * | |
| 2940 * Note that the rounding factors are NOT supposed to be the same! 128 and | |
| 2941 * 32768 are correct for the NODIV code; 127 and 32767 are correct for the | |
| 2942 * standard method. | |
| 2943 * | |
| 2944 * [Optimized code by Greg Roelofs and Mark Adler...blame us for bugs. :-) ] | |
| 2945 */ | |
| 2946 | |
| 2947 /* fg and bg should be in `gamma 1.0' space; alpha is the opacity */ | |
| 2948 | |
| 2949 # define png_composite(composite, fg, alpha, bg) \ | |
| 2950 { png_uint_16 temp = (png_uint_16)((png_uint_16)(fg) \ | |
| 2951 * (png_uint_16)(alpha) \ | |
| 2952 + (png_uint_16)(bg)*(png_uint_16)(255 \ | |
| 2953 - (png_uint_16)(alpha)) + 128); \ | |
| 2954 (composite) = (png_byte)((temp + (temp >> 8)) >> 8); } | |
| 2955 | |
| 2956 # define png_composite_16(composite, fg, alpha, bg) \ | |
| 2957 { png_uint_32 temp = (png_uint_32)((png_uint_32)(fg) \ | |
| 2958 * (png_uint_32)(alpha) \ | |
| 2959 + (png_uint_32)(bg)*(65535 \ | |
| 2960 - (png_uint_32)(alpha)) + 32768); \ | |
| 2961 (composite) = (png_uint_16)((temp + (temp >> 16)) >> 16); } | |
| 2962 | |
| 2963 #else /* Standard method using integer division */ | |
| 2964 | |
| 2965 # define png_composite(composite, fg, alpha, bg) \ | |
| 2966 (composite) = (png_byte)(((png_uint_16)(fg) * (png_uint_16)(alpha) + \ | |
| 2967 (png_uint_16)(bg) * (png_uint_16)(255 - (png_uint_16)(alpha)) + \ | |
| 2968 127) / 255) | |
| 2969 | |
| 2970 # define png_composite_16(composite, fg, alpha, bg) \ | |
| 2971 (composite) = (png_uint_16)(((png_uint_32)(fg) * (png_uint_32)(alpha) + \ | |
| 2972 (png_uint_32)(bg)*(png_uint_32)(65535 - (png_uint_32)(alpha)) + \ | |
| 2973 32767) / 65535) | |
| 2974 #endif /* PNG_READ_COMPOSITE_NODIV_SUPPORTED */ | |
| 2975 | |
| 2976 #ifdef PNG_READ_INT_FUNCTIONS_SUPPORTED | |
| 2977 PNG_EXPORT(201, png_uint_32, png_get_uint_32, (png_const_bytep buf)); | |
| 2978 PNG_EXPORT(202, png_uint_16, png_get_uint_16, (png_const_bytep buf)); | |
| 2979 PNG_EXPORT(203, png_int_32, png_get_int_32, (png_const_bytep buf)); | |
| 2980 #endif | |
| 2981 | |
| 2982 PNG_EXPORT(204, png_uint_32, png_get_uint_31, (png_const_structrp png_ptr, | |
| 2983 png_const_bytep buf)); | |
| 2984 /* No png_get_int_16 -- may be added if there's a real need for it. */ | |
| 2985 | |
| 2986 /* Place a 32-bit number into a buffer in PNG byte order (big-endian). */ | |
| 2987 #ifdef PNG_WRITE_INT_FUNCTIONS_SUPPORTED | |
| 2988 PNG_EXPORT(205, void, png_save_uint_32, (png_bytep buf, png_uint_32 i)); | |
| 2989 #endif | |
| 2990 #ifdef PNG_SAVE_INT_32_SUPPORTED | |
| 2991 PNG_EXPORT(206, void, png_save_int_32, (png_bytep buf, png_int_32 i)); | |
| 2992 #endif | |
| 2993 | |
| 2994 /* Place a 16-bit number into a buffer in PNG byte order. | |
| 2995 * The parameter is declared unsigned int, not png_uint_16, | |
| 2996 * just to avoid potential problems on pre-ANSI C compilers. | |
| 2997 */ | |
| 2998 #ifdef PNG_WRITE_INT_FUNCTIONS_SUPPORTED | |
| 2999 PNG_EXPORT(207, void, png_save_uint_16, (png_bytep buf, unsigned int i)); | |
| 3000 /* No png_save_int_16 -- may be added if there's a real need for it. */ | |
| 3001 #endif | |
| 3002 | |
| 3003 #ifdef PNG_USE_READ_MACROS | |
| 3004 /* Inline macros to do direct reads of bytes from the input buffer. | |
| 3005 * The png_get_int_32() routine assumes we are using two's complement | |
| 3006 * format for negative values, which is almost certainly true. | |
| 3007 */ | |
| 3008 # define PNG_get_uint_32(buf) \ | |
| 3009 (((png_uint_32)(*(buf)) << 24) + \ | |
| 3010 ((png_uint_32)(*((buf) + 1)) << 16) + \ | |
| 3011 ((png_uint_32)(*((buf) + 2)) << 8) + \ | |
| 3012 ((png_uint_32)(*((buf) + 3)))) | |
| 3013 | |
| 3014 /* From libpng-1.4.0 until 1.4.4, the png_get_uint_16 macro (but not the | |
| 3015 * function) incorrectly returned a value of type png_uint_32. | |
| 3016 */ | |
| 3017 # define PNG_get_uint_16(buf) \ | |
| 3018 ((png_uint_16) \ | |
| 3019 (((unsigned int)(*(buf)) << 8) + \ | |
| 3020 ((unsigned int)(*((buf) + 1))))) | |
| 3021 | |
| 3022 # define PNG_get_int_32(buf) \ | |
| 3023 ((png_int_32)((*(buf) & 0x80) \ | |
| 3024 ? -((png_int_32)((png_get_uint_32(buf) ^ 0xffffffffL) + 1)) \ | |
| 3025 : (png_int_32)png_get_uint_32(buf))) | |
| 3026 | |
| 3027 /* If PNG_PREFIX is defined the same thing as below happens in pnglibconf.h, | |
| 3028 * but defining a macro name prefixed with PNG_PREFIX. | |
| 3029 */ | |
| 3030 # ifndef PNG_PREFIX | |
| 3031 # define png_get_uint_32(buf) PNG_get_uint_32(buf) | |
| 3032 # define png_get_uint_16(buf) PNG_get_uint_16(buf) | |
| 3033 # define png_get_int_32(buf) PNG_get_int_32(buf) | |
| 3034 # endif | |
| 3035 #else | |
| 3036 # ifdef PNG_PREFIX | |
| 3037 /* No macros; revert to the (redefined) function */ | |
| 3038 # define PNG_get_uint_32 (png_get_uint_32) | |
| 3039 # define PNG_get_uint_16 (png_get_uint_16) | |
| 3040 # define PNG_get_int_32 (png_get_int_32) | |
| 3041 # endif | |
| 3042 #endif | |
| 3043 | |
| 3044 /******************************************************************************* | |
| 3045 * SIMPLIFIED API | |
| 3046 ******************************************************************************* | |
| 3047 * | |
| 3048 * Please read the documentation in libpng-manual.txt (TODO: write said | |
| 3049 * documentation) if you don't understand what follows. | |
| 3050 * | |
| 3051 * The simplified API hides the details of both libpng and the PNG file format | |
| 3052 * itself. It allows PNG files to be read into a very limited number of | |
| 3053 * in-memory bitmap formats or to be written from the same formats. If these | |
| 3054 * formats do not accomodate your needs then you can, and should, use the more | |
| 3055 * sophisticated APIs above - these support a wide variety of in-memory formats | |
| 3056 * and a wide variety of sophisticated transformations to those formats as well | |
| 3057 * as a wide variety of APIs to manipulate ancillary information. | |
| 3058 * | |
| 3059 * To read a PNG file using the simplified API: | |
| 3060 * | |
| 3061 * 1) Declare a 'png_image' structure (see below) on the stack and set the | |
| 3062 * version field to PNG_IMAGE_VERSION. | |
| 3063 * 2) Call the appropriate png_image_begin_read... function. | |
| 3064 * 3) Set the png_image 'format' member to the required sample format. | |
| 3065 * 4) Allocate a buffer for the image and, if required, the color-map. | |
| 3066 * 5) Call png_image_finish_read to read the image and, if required, the | |
| 3067 * color-map into your buffers. | |
| 3068 * | |
| 3069 * There are no restrictions on the format of the PNG input itself; all valid | |
| 3070 * color types, bit depths, and interlace methods are acceptable, and the | |
| 3071 * input image is transformed as necessary to the requested in-memory format | |
| 3072 * during the png_image_finish_read() step. The only caveat is that if you | |
| 3073 * request a color-mapped image from a PNG that is full-color or makes | |
| 3074 * complex use of an alpha channel the transformation is extremely lossy and the | |
| 3075 * result may look terrible. | |
| 3076 * | |
| 3077 * To write a PNG file using the simplified API: | |
| 3078 * | |
| 3079 * 1) Declare a 'png_image' structure on the stack and memset() it to all zero. | |
| 3080 * 2) Initialize the members of the structure that describe the image, setting | |
| 3081 * the 'format' member to the format of the image samples. | |
| 3082 * 3) Call the appropriate png_image_write... function with a pointer to the | |
| 3083 * image and, if necessary, the color-map to write the PNG data. | |
| 3084 * | |
| 3085 * png_image is a structure that describes the in-memory format of an image | |
| 3086 * when it is being read or defines the in-memory format of an image that you | |
| 3087 * need to write: | |
| 3088 */ | |
| 3089 #define PNG_IMAGE_VERSION 1 | |
| 3090 | |
| 3091 typedef struct png_control *png_controlp; | |
| 3092 typedef struct | |
| 3093 { | |
| 3094 png_controlp opaque; /* Initialize to NULL, free with png_image_free */ | |
| 3095 png_uint_32 version; /* Set to PNG_IMAGE_VERSION */ | |
| 3096 png_uint_32 width; /* Image width in pixels (columns) */ | |
| 3097 png_uint_32 height; /* Image height in pixels (rows) */ | |
| 3098 png_uint_32 format; /* Image format as defined below */ | |
| 3099 png_uint_32 flags; /* A bit mask containing informational flags */ | |
| 3100 png_uint_32 colormap_entries; | |
| 3101 /* Number of entries in the color-map */ | |
| 3102 | |
| 3103 /* In the event of an error or warning the following field will be set to a | |
| 3104 * non-zero value and the 'message' field will contain a '\0' terminated | |
| 3105 * string with the libpng error or warning message. If both warnings and | |
| 3106 * an error were encountered, only the error is recorded. If there | |
| 3107 * are multiple warnings, only the first one is recorded. | |
| 3108 * | |
| 3109 * The upper 30 bits of this value are reserved, the low two bits contain | |
| 3110 * a value as follows: | |
| 3111 */ | |
| 3112 # define PNG_IMAGE_WARNING 1 | |
| 3113 # define PNG_IMAGE_ERROR 2 | |
| 3114 /* | |
| 3115 * The result is a two bit code such that a value more than 1 indicates | |
| 3116 * a failure in the API just called: | |
| 3117 * | |
| 3118 * 0 - no warning or error | |
| 3119 * 1 - warning | |
| 3120 * 2 - error | |
| 3121 * 3 - error preceded by warning | |
| 3122 */ | |
| 3123 # define PNG_IMAGE_FAILED(png_cntrl) ((((png_cntrl).warning_or_error)&0x03)>1) | |
| 3124 | |
| 3125 png_uint_32 warning_or_error; | |
| 3126 | |
| 3127 char message[64]; | |
| 3128 } png_image, *png_imagep; | |
| 3129 | |
| 3130 /* The samples of the image have one to four channels whose components have | |
| 3131 * original values in the range 0 to 1.0: | |
| 3132 * | |
| 3133 * 1: A single gray or luminance channel (G). | |
| 3134 * 2: A gray/luminance channel and an alpha channel (GA). | |
| 3135 * 3: Three red, green, blue color channels (RGB). | |
| 3136 * 4: Three color channels and an alpha channel (RGBA). | |
| 3137 * | |
| 3138 * The components are encoded in one of two ways: | |
| 3139 * | |
| 3140 * a) As a small integer, value 0..255, contained in a single byte. For the | |
| 3141 * alpha channel the original value is simply value/255. For the color or | |
| 3142 * luminance channels the value is encoded according to the sRGB specification | |
| 3143 * and matches the 8-bit format expected by typical display devices. | |
| 3144 * | |
| 3145 * The color/gray channels are not scaled (pre-multiplied) by the alpha | |
| 3146 * channel and are suitable for passing to color management software. | |
| 3147 * | |
| 3148 * b) As a value in the range 0..65535, contained in a 2-byte integer. All | |
| 3149 * channels can be converted to the original value by dividing by 65535; all | |
| 3150 * channels are linear. Color channels use the RGB encoding (RGB end-points) of | |
| 3151 * the sRGB specification. This encoding is identified by the | |
| 3152 * PNG_FORMAT_FLAG_LINEAR flag below. | |
| 3153 * | |
| 3154 * When the simplified API needs to convert between sRGB and linear colorspaces, | |
| 3155 * the actual sRGB transfer curve defined in the sRGB specification (see the | |
| 3156 * article at http://en.wikipedia.org/wiki/SRGB) is used, not the gamma=1/2.2 | |
| 3157 * approximation used elsewhere in libpng. | |
| 3158 * | |
| 3159 * When an alpha channel is present it is expected to denote pixel coverage | |
| 3160 * of the color or luminance channels and is returned as an associated alpha | |
| 3161 * channel: the color/gray channels are scaled (pre-multiplied) by the alpha | |
| 3162 * value. | |
| 3163 * | |
| 3164 * The samples are either contained directly in the image data, between 1 and 8 | |
| 3165 * bytes per pixel according to the encoding, or are held in a color-map indexed | |
| 3166 * by bytes in the image data. In the case of a color-map the color-map entries | |
| 3167 * are individual samples, encoded as above, and the image data has one byte per | |
| 3168 * pixel to select the relevant sample from the color-map. | |
| 3169 */ | |
| 3170 | |
| 3171 /* PNG_FORMAT_* | |
| 3172 * | |
| 3173 * #defines to be used in png_image::format. Each #define identifies a | |
| 3174 * particular layout of sample data and, if present, alpha values. There are | |
| 3175 * separate defines for each of the two component encodings. | |
| 3176 * | |
| 3177 * A format is built up using single bit flag values. All combinations are | |
| 3178 * valid. Formats can be built up from the flag values or you can use one of | |
| 3179 * the predefined values below. When testing formats always use the FORMAT_FLAG | |
| 3180 * macros to test for individual features - future versions of the library may | |
| 3181 * add new flags. | |
| 3182 * | |
| 3183 * When reading or writing color-mapped images the format should be set to the | |
| 3184 * format of the entries in the color-map then png_image_{read,write}_colormap | |
| 3185 * called to read or write the color-map and set the format correctly for the | |
| 3186 * image data. Do not set the PNG_FORMAT_FLAG_COLORMAP bit directly! | |
| 3187 * | |
| 3188 * NOTE: libpng can be built with particular features disabled, if you see | |
| 3189 * compiler errors because the definition of one of the following flags has been | |
| 3190 * compiled out it is because libpng does not have the required support. It is | |
| 3191 * possible, however, for the libpng configuration to enable the format on just | |
| 3192 * read or just write; in that case you may see an error at run time. You can | |
| 3193 * guard against this by checking for the definition of the appropriate | |
| 3194 * "_SUPPORTED" macro, one of: | |
| 3195 * | |
| 3196 * PNG_SIMPLIFIED_{READ,WRITE}_{BGR,AFIRST}_SUPPORTED | |
| 3197 */ | |
| 3198 #define PNG_FORMAT_FLAG_ALPHA 0x01U /* format with an alpha channel */ | |
| 3199 #define PNG_FORMAT_FLAG_COLOR 0x02U /* color format: otherwise grayscale */ | |
| 3200 #define PNG_FORMAT_FLAG_LINEAR 0x04U /* 2 byte channels else 1 byte */ | |
| 3201 #define PNG_FORMAT_FLAG_COLORMAP 0x08U /* image data is color-mapped */ | |
| 3202 | |
| 3203 #ifdef PNG_FORMAT_BGR_SUPPORTED | |
| 3204 # define PNG_FORMAT_FLAG_BGR 0x10U /* BGR colors, else order is RGB */ | |
| 3205 #endif | |
| 3206 | |
| 3207 #ifdef PNG_FORMAT_AFIRST_SUPPORTED | |
| 3208 # define PNG_FORMAT_FLAG_AFIRST 0x20U /* alpha channel comes first */ | |
| 3209 #endif | |
| 3210 | |
| 3211 /* Commonly used formats have predefined macros. | |
| 3212 * | |
| 3213 * First the single byte (sRGB) formats: | |
| 3214 */ | |
| 3215 #define PNG_FORMAT_GRAY 0 | |
| 3216 #define PNG_FORMAT_GA PNG_FORMAT_FLAG_ALPHA | |
| 3217 #define PNG_FORMAT_AG (PNG_FORMAT_GA|PNG_FORMAT_FLAG_AFIRST) | |
| 3218 #define PNG_FORMAT_RGB PNG_FORMAT_FLAG_COLOR | |
| 3219 #define PNG_FORMAT_BGR (PNG_FORMAT_FLAG_COLOR|PNG_FORMAT_FLAG_BGR) | |
| 3220 #define PNG_FORMAT_RGBA (PNG_FORMAT_RGB|PNG_FORMAT_FLAG_ALPHA) | |
| 3221 #define PNG_FORMAT_ARGB (PNG_FORMAT_RGBA|PNG_FORMAT_FLAG_AFIRST) | |
| 3222 #define PNG_FORMAT_BGRA (PNG_FORMAT_BGR|PNG_FORMAT_FLAG_ALPHA) | |
| 3223 #define PNG_FORMAT_ABGR (PNG_FORMAT_BGRA|PNG_FORMAT_FLAG_AFIRST) | |
| 3224 | |
| 3225 /* Then the linear 2-byte formats. When naming these "Y" is used to | |
| 3226 * indicate a luminance (gray) channel. | |
| 3227 */ | |
| 3228 #define PNG_FORMAT_LINEAR_Y PNG_FORMAT_FLAG_LINEAR | |
| 3229 #define PNG_FORMAT_LINEAR_Y_ALPHA (PNG_FORMAT_FLAG_LINEAR|PNG_FORMAT_FLAG_ALPHA) | |
| 3230 #define PNG_FORMAT_LINEAR_RGB (PNG_FORMAT_FLAG_LINEAR|PNG_FORMAT_FLAG_COLOR) | |
| 3231 #define PNG_FORMAT_LINEAR_RGB_ALPHA \ | |
| 3232 (PNG_FORMAT_FLAG_LINEAR|PNG_FORMAT_FLAG_COLOR|PNG_FORMAT_FLAG_ALPHA) | |
| 3233 | |
| 3234 /* With color-mapped formats the image data is one byte for each pixel, the byte | |
| 3235 * is an index into the color-map which is formatted as above. To obtain a | |
| 3236 * color-mapped format it is sufficient just to add the PNG_FOMAT_FLAG_COLORMAP | |
| 3237 * to one of the above definitions, or you can use one of the definitions below. | |
| 3238 */ | |
| 3239 #define PNG_FORMAT_RGB_COLORMAP (PNG_FORMAT_RGB|PNG_FORMAT_FLAG_COLORMAP) | |
| 3240 #define PNG_FORMAT_BGR_COLORMAP (PNG_FORMAT_BGR|PNG_FORMAT_FLAG_COLORMAP) | |
| 3241 #define PNG_FORMAT_RGBA_COLORMAP (PNG_FORMAT_RGBA|PNG_FORMAT_FLAG_COLORMAP) | |
| 3242 #define PNG_FORMAT_ARGB_COLORMAP (PNG_FORMAT_ARGB|PNG_FORMAT_FLAG_COLORMAP) | |
| 3243 #define PNG_FORMAT_BGRA_COLORMAP (PNG_FORMAT_BGRA|PNG_FORMAT_FLAG_COLORMAP) | |
| 3244 #define PNG_FORMAT_ABGR_COLORMAP (PNG_FORMAT_ABGR|PNG_FORMAT_FLAG_COLORMAP) | |
| 3245 | |
| 3246 /* PNG_IMAGE macros | |
| 3247 * | |
| 3248 * These are convenience macros to derive information from a png_image | |
| 3249 * structure. The PNG_IMAGE_SAMPLE_ macros return values appropriate to the | |
| 3250 * actual image sample values - either the entries in the color-map or the | |
| 3251 * pixels in the image. The PNG_IMAGE_PIXEL_ macros return corresponding values | |
| 3252 * for the pixels and will always return 1 for color-mapped formats. The | |
| 3253 * remaining macros return information about the rows in the image and the | |
| 3254 * complete image. | |
| 3255 * | |
| 3256 * NOTE: All the macros that take a png_image::format parameter are compile time | |
| 3257 * constants if the format parameter is, itself, a constant. Therefore these | |
| 3258 * macros can be used in array declarations and case labels where required. | |
| 3259 * Similarly the macros are also pre-processor constants (sizeof is not used) so | |
| 3260 * they can be used in #if tests. | |
| 3261 * | |
| 3262 * First the information about the samples. | |
| 3263 */ | |
| 3264 #define PNG_IMAGE_SAMPLE_CHANNELS(fmt)\ | |
| 3265 (((fmt)&(PNG_FORMAT_FLAG_COLOR|PNG_FORMAT_FLAG_ALPHA))+1) | |
| 3266 /* Return the total number of channels in a given format: 1..4 */ | |
| 3267 | |
| 3268 #define PNG_IMAGE_SAMPLE_COMPONENT_SIZE(fmt)\ | |
| 3269 ((((fmt) & PNG_FORMAT_FLAG_LINEAR) >> 2)+1) | |
| 3270 /* Return the size in bytes of a single component of a pixel or color-map | |
| 3271 * entry (as appropriate) in the image: 1 or 2. | |
| 3272 */ | |
| 3273 | |
| 3274 #define PNG_IMAGE_SAMPLE_SIZE(fmt)\ | |
| 3275 (PNG_IMAGE_SAMPLE_CHANNELS(fmt) * PNG_IMAGE_SAMPLE_COMPONENT_SIZE(fmt)) | |
| 3276 /* This is the size of the sample data for one sample. If the image is | |
| 3277 * color-mapped it is the size of one color-map entry (and image pixels are | |
| 3278 * one byte in size), otherwise it is the size of one image pixel. | |
| 3279 */ | |
| 3280 | |
| 3281 #define PNG_IMAGE_MAXIMUM_COLORMAP_COMPONENTS(fmt)\ | |
| 3282 (PNG_IMAGE_SAMPLE_CHANNELS(fmt) * 256) | |
| 3283 /* The maximum size of the color-map required by the format expressed in a | |
| 3284 * count of components. This can be used to compile-time allocate a | |
| 3285 * color-map: | |
| 3286 * | |
| 3287 * png_uint_16 colormap[PNG_IMAGE_MAXIMUM_COLORMAP_COMPONENTS(linear_fmt)]; | |
| 3288 * | |
| 3289 * png_byte colormap[PNG_IMAGE_MAXIMUM_COLORMAP_COMPONENTS(sRGB_fmt)]; | |
| 3290 * | |
| 3291 * Alternatively use the PNG_IMAGE_COLORMAP_SIZE macro below to use the | |
| 3292 * information from one of the png_image_begin_read_ APIs and dynamically | |
| 3293 * allocate the required memory. | |
| 3294 */ | |
| 3295 | |
| 3296 /* Corresponding information about the pixels */ | |
| 3297 #define PNG_IMAGE_PIXEL_(test,fmt)\ | |
| 3298 (((fmt)&PNG_FORMAT_FLAG_COLORMAP)?1:test(fmt)) | |
| 3299 | |
| 3300 #define PNG_IMAGE_PIXEL_CHANNELS(fmt)\ | |
| 3301 PNG_IMAGE_PIXEL_(PNG_IMAGE_SAMPLE_CHANNELS,fmt) | |
| 3302 /* The number of separate channels (components) in a pixel; 1 for a | |
| 3303 * color-mapped image. | |
| 3304 */ | |
| 3305 | |
| 3306 #define PNG_IMAGE_PIXEL_COMPONENT_SIZE(fmt)\ | |
| 3307 PNG_IMAGE_PIXEL_(PNG_IMAGE_SAMPLE_COMPONENT_SIZE,fmt) | |
| 3308 /* The size, in bytes, of each component in a pixel; 1 for a color-mapped | |
| 3309 * image. | |
| 3310 */ | |
| 3311 | |
| 3312 #define PNG_IMAGE_PIXEL_SIZE(fmt) PNG_IMAGE_PIXEL_(PNG_IMAGE_SAMPLE_SIZE,fmt) | |
| 3313 /* The size, in bytes, of a complete pixel; 1 for a color-mapped image. */ | |
| 3314 | |
| 3315 /* Information about the whole row, or whole image */ | |
| 3316 #define PNG_IMAGE_ROW_STRIDE(image)\ | |
| 3317 (PNG_IMAGE_PIXEL_CHANNELS((image).format) * (image).width) | |
| 3318 /* Return the total number of components in a single row of the image; this | |
| 3319 * is the minimum 'row stride', the minimum count of components between each | |
| 3320 * row. For a color-mapped image this is the minimum number of bytes in a | |
| 3321 * row. | |
| 3322 */ | |
| 3323 | |
| 3324 #define PNG_IMAGE_BUFFER_SIZE(image, row_stride)\ | |
| 3325 (PNG_IMAGE_PIXEL_COMPONENT_SIZE((image).format)*(image).height*(row_stride)) | |
| 3326 /* Return the size, in bytes, of an image buffer given a png_image and a row | |
| 3327 * stride - the number of components to leave space for in each row. | |
| 3328 */ | |
| 3329 | |
| 3330 #define PNG_IMAGE_SIZE(image)\ | |
| 3331 PNG_IMAGE_BUFFER_SIZE(image, PNG_IMAGE_ROW_STRIDE(image)) | |
| 3332 /* Return the size, in bytes, of the image in memory given just a png_image; | |
| 3333 * the row stride is the minimum stride required for the image. | |
| 3334 */ | |
| 3335 | |
| 3336 #define PNG_IMAGE_COLORMAP_SIZE(image)\ | |
| 3337 (PNG_IMAGE_SAMPLE_SIZE((image).format) * (image).colormap_entries) | |
| 3338 /* Return the size, in bytes, of the color-map of this image. If the image | |
| 3339 * format is not a color-map format this will return a size sufficient for | |
| 3340 * 256 entries in the given format; check PNG_FORMAT_FLAG_COLORMAP if | |
| 3341 * you don't want to allocate a color-map in this case. | |
| 3342 */ | |
| 3343 | |
| 3344 /* PNG_IMAGE_FLAG_* | |
| 3345 * | |
| 3346 * Flags containing additional information about the image are held in the | |
| 3347 * 'flags' field of png_image. | |
| 3348 */ | |
| 3349 #define PNG_IMAGE_FLAG_COLORSPACE_NOT_sRGB 0x01 | |
| 3350 /* This indicates the the RGB values of the in-memory bitmap do not | |
| 3351 * correspond to the red, green and blue end-points defined by sRGB. | |
| 3352 */ | |
| 3353 | |
| 3354 #define PNG_IMAGE_FLAG_FAST 0x02 | |
| 3355 /* On write emphasise speed over compression; the resultant PNG file will be | |
| 3356 * larger but will be produced significantly faster, particular for large | |
| 3357 * images. Do not use this option for images which will be distributed, only | |
| 3358 * used it when producing intermediate files that will be read back in | |
| 3359 * repeatedly. For a typical 24-bit image the option will double the read | |
| 3360 * speed at the cost of increasing the image size by 25%, however for many | |
| 3361 * more compressible images the PNG file can be 10 times larger with only a | |
| 3362 * slight speed gain. | |
| 3363 */ | |
| 3364 | |
| 3365 #define PNG_IMAGE_FLAG_16BIT_sRGB 0x04 | |
| 3366 /* On read if the image is a 16-bit per component image and there is no gAMA | |
| 3367 * or sRGB chunk assume that the components are sRGB encoded. Notice that | |
| 3368 * images output by the simplified API always have gamma information; setting | |
| 3369 * this flag only affects the interpretation of 16-bit images from an | |
| 3370 * external source. It is recommended that the application expose this flag | |
| 3371 * to the user; the user can normally easily recognize the difference between | |
| 3372 * linear and sRGB encoding. This flag has no effect on write - the data | |
| 3373 * passed to the write APIs must have the correct encoding (as defined | |
| 3374 * above.) | |
| 3375 * | |
| 3376 * If the flag is not set (the default) input 16-bit per component data is | |
| 3377 * assumed to be linear. | |
| 3378 * | |
| 3379 * NOTE: the flag can only be set after the png_image_begin_read_ call, | |
| 3380 * because that call initializes the 'flags' field. | |
| 3381 */ | |
| 3382 | |
| 3383 #ifdef PNG_SIMPLIFIED_READ_SUPPORTED | |
| 3384 /* READ APIs | |
| 3385 * --------- | |
| 3386 * | |
| 3387 * The png_image passed to the read APIs must have been initialized by setting | |
| 3388 * the png_controlp field 'opaque' to NULL (or, safer, memset the whole thing.) | |
| 3389 */ | |
| 3390 #ifdef PNG_STDIO_SUPPORTED | |
| 3391 PNG_EXPORT(234, int, png_image_begin_read_from_file, (png_imagep image, | |
| 3392 const char *file_name)); | |
| 3393 /* The named file is opened for read and the image header is filled in | |
| 3394 * from the PNG header in the file. | |
| 3395 */ | |
| 3396 | |
| 3397 PNG_EXPORT(235, int, png_image_begin_read_from_stdio, (png_imagep image, | |
| 3398 FILE* file)); | |
| 3399 /* The PNG header is read from the stdio FILE object. */ | |
| 3400 #endif /* PNG_STDIO_SUPPORTED */ | |
| 3401 | |
| 3402 PNG_EXPORT(236, int, png_image_begin_read_from_memory, (png_imagep image, | |
| 3403 png_const_voidp memory, png_size_t size)); | |
| 3404 /* The PNG header is read from the given memory buffer. */ | |
| 3405 | |
| 3406 PNG_EXPORT(237, int, png_image_finish_read, (png_imagep image, | |
| 3407 png_const_colorp background, void *buffer, png_int_32 row_stride, | |
| 3408 void *colormap)); | |
| 3409 /* Finish reading the image into the supplied buffer and clean up the | |
| 3410 * png_image structure. | |
| 3411 * | |
| 3412 * row_stride is the step, in byte or 2-byte units as appropriate, | |
| 3413 * between adjacent rows. A positive stride indicates that the top-most row | |
| 3414 * is first in the buffer - the normal top-down arrangement. A negative | |
| 3415 * stride indicates that the bottom-most row is first in the buffer. | |
| 3416 * | |
| 3417 * background need only be supplied if an alpha channel must be removed from | |
| 3418 * a png_byte format and the removal is to be done by compositing on a solid | |
| 3419 * color; otherwise it may be NULL and any composition will be done directly | |
| 3420 * onto the buffer. The value is an sRGB color to use for the background, | |
| 3421 * for grayscale output the green channel is used. | |
| 3422 * | |
| 3423 * background must be supplied when an alpha channel must be removed from a | |
| 3424 * single byte color-mapped output format, in other words if: | |
| 3425 * | |
| 3426 * 1) The original format from png_image_begin_read_from_* had | |
| 3427 * PNG_FORMAT_FLAG_ALPHA set. | |
| 3428 * 2) The format set by the application does not. | |
| 3429 * 3) The format set by the application has PNG_FORMAT_FLAG_COLORMAP set and | |
| 3430 * PNG_FORMAT_FLAG_LINEAR *not* set. | |
| 3431 * | |
| 3432 * For linear output removing the alpha channel is always done by compositing | |
| 3433 * on black and background is ignored. | |
| 3434 * | |
| 3435 * colormap must be supplied when PNG_FORMAT_FLAG_COLORMAP is set. It must | |
| 3436 * be at least the size (in bytes) returned by PNG_IMAGE_COLORMAP_SIZE. | |
| 3437 * image->colormap_entries will be updated to the actual number of entries | |
| 3438 * written to the colormap; this may be less than the original value. | |
| 3439 */ | |
| 3440 | |
| 3441 PNG_EXPORT(238, void, png_image_free, (png_imagep image)); | |
| 3442 /* Free any data allocated by libpng in image->opaque, setting the pointer to | |
| 3443 * NULL. May be called at any time after the structure is initialized. | |
| 3444 */ | |
| 3445 #endif /* PNG_SIMPLIFIED_READ_SUPPORTED */ | |
| 3446 | |
| 3447 #ifdef PNG_SIMPLIFIED_WRITE_SUPPORTED | |
| 3448 #ifdef PNG_STDIO_SUPPORTED | |
| 3449 /* WRITE APIS | |
| 3450 * ---------- | |
| 3451 * For write you must initialize a png_image structure to describe the image to | |
| 3452 * be written. To do this use memset to set the whole structure to 0 then | |
| 3453 * initialize fields describing your image. | |
| 3454 * | |
| 3455 * version: must be set to PNG_IMAGE_VERSION | |
| 3456 * opaque: must be initialized to NULL | |
| 3457 * width: image width in pixels | |
| 3458 * height: image height in rows | |
| 3459 * format: the format of the data (image and color-map) you wish to write | |
| 3460 * flags: set to 0 unless one of the defined flags applies; set | |
| 3461 * PNG_IMAGE_FLAG_COLORSPACE_NOT_sRGB for color format images where the RGB | |
| 3462 * values do not correspond to the colors in sRGB. | |
| 3463 * colormap_entries: set to the number of entries in the color-map (0 to 256) | |
| 3464 */ | |
| 3465 PNG_EXPORT(239, int, png_image_write_to_file, (png_imagep image, | |
| 3466 const char *file, int convert_to_8bit, const void *buffer, | |
| 3467 png_int_32 row_stride, const void *colormap)); | |
| 3468 /* Write the image to the named file. */ | |
| 3469 | |
| 3470 PNG_EXPORT(240, int, png_image_write_to_stdio, (png_imagep image, FILE *file, | |
| 3471 int convert_to_8_bit, const void *buffer, png_int_32 row_stride, | |
| 3472 const void *colormap)); | |
| 3473 /* Write the image to the given (FILE*). */ | |
| 3474 | |
| 3475 /* With both write APIs if image is in one of the linear formats with 16-bit | |
| 3476 * data then setting convert_to_8_bit will cause the output to be an 8-bit PNG | |
| 3477 * gamma encoded according to the sRGB specification, otherwise a 16-bit linear | |
| 3478 * encoded PNG file is written. | |
| 3479 * | |
| 3480 * With color-mapped data formats the colormap parameter point to a color-map | |
| 3481 * with at least image->colormap_entries encoded in the specified format. If | |
| 3482 * the format is linear the written PNG color-map will be converted to sRGB | |
| 3483 * regardless of the convert_to_8_bit flag. | |
| 3484 * | |
| 3485 * With all APIs row_stride is handled as in the read APIs - it is the spacing | |
| 3486 * from one row to the next in component sized units (1 or 2 bytes) and if | |
| 3487 * negative indicates a bottom-up row layout in the buffer. | |
| 3488 * | |
| 3489 * Note that the write API does not support interlacing or sub-8-bit pixels. | |
| 3490 */ | |
| 3491 #endif /* PNG_STDIO_SUPPORTED */ | |
| 3492 #endif /* PNG_SIMPLIFIED_WRITE_SUPPORTED */ | |
| 3493 /******************************************************************************* | |
| 3494 * END OF SIMPLIFIED API | |
| 3495 ******************************************************************************/ | |
| 3496 | |
| 3497 #ifdef PNG_CHECK_FOR_INVALID_INDEX_SUPPORTED | |
| 3498 PNG_EXPORT(242, void, png_set_check_for_invalid_index, | |
| 3499 (png_structrp png_ptr, int allowed)); | |
| 3500 # ifdef PNG_GET_PALETTE_MAX_SUPPORTED | |
| 3501 PNG_EXPORT(243, int, png_get_palette_max, (png_const_structp png_ptr, | |
| 3502 png_const_infop info_ptr)); | |
| 3503 # endif | |
| 3504 #endif /* CHECK_FOR_INVALID_INDEX */ | |
| 3505 | |
| 3506 /******************************************************************************* | |
| 3507 * IMPLEMENTATION OPTIONS | |
| 3508 ******************************************************************************* | |
| 3509 * | |
| 3510 * Support for arbitrary implementation-specific optimizations. The API allows | |
| 3511 * particular options to be turned on or off. 'Option' is the number of the | |
| 3512 * option and 'onoff' is 0 (off) or non-0 (on). The value returned is given | |
| 3513 * by the PNG_OPTION_ defines below. | |
| 3514 * | |
| 3515 * HARDWARE: normally hardware capabilites, such as the Intel SSE instructions, | |
| 3516 * are detected at run time, however sometimes it may be impossible | |
| 3517 * to do this in user mode, in which case it is necessary to discover | |
| 3518 * the capabilities in an OS specific way. Such capabilities are | |
| 3519 * listed here when libpng has support for them and must be turned | |
| 3520 * ON by the application if present. | |
| 3521 * | |
| 3522 * SOFTWARE: sometimes software optimizations actually result in performance | |
| 3523 * decrease on some architectures or systems, or with some sets of | |
| 3524 * PNG images. 'Software' options allow such optimizations to be | |
| 3525 * selected at run time. | |
| 3526 */ | |
| 3527 #ifdef PNG_SET_OPTION_SUPPORTED | |
| 3528 #ifdef PNG_ARM_NEON_API_SUPPORTED | |
| 3529 # define PNG_ARM_NEON 0 /* HARDWARE: ARM Neon SIMD instructions supported */ | |
| 3530 #endif | |
| 3531 #define PNG_MAXIMUM_INFLATE_WINDOW 2 /* SOFTWARE: force maximum window */ | |
| 3532 #define PNG_OPTION_NEXT 4 /* Next option - numbers must be even */ | |
| 3533 | |
| 3534 /* Return values: NOTE: there are four values and 'off' is *not* zero */ | |
| 3535 #define PNG_OPTION_UNSET 0 /* Unset - defaults to off */ | |
| 3536 #define PNG_OPTION_INVALID 1 /* Option number out of range */ | |
| 3537 #define PNG_OPTION_OFF 2 | |
| 3538 #define PNG_OPTION_ON 3 | |
| 3539 | |
| 3540 PNG_EXPORT(244, int, png_set_option, (png_structrp png_ptr, int option, | |
| 3541 int onoff)); | |
| 3542 #endif | |
| 3543 | |
| 3544 /******************************************************************************* | |
| 3545 * END OF HARDWARE OPTIONS | |
| 3546 ******************************************************************************/ | |
| 3547 | |
| 3548 /* Maintainer: Put new public prototypes here ^, in libpng.3, and project | |
| 3549 * defs, scripts/pnglibconf.h, and scripts/pnglibconf.h.prebuilt | |
| 3550 */ | |
| 3551 | |
| 3552 /* The last ordinal number (this is the *last* one already used; the next | |
| 3553 * one to use is one more than this.) Maintainer, remember to add an entry to | |
| 3554 * scripts/symbols.def as well. | |
| 3555 */ | |
| 3556 #ifdef PNG_EXPORT_LAST_ORDINAL | |
| 3557 PNG_EXPORT_LAST_ORDINAL(244); | |
| 3558 #endif | |
| 3559 | |
| 3560 #ifdef __cplusplus | |
| 3561 } | |
| 3562 #endif | |
| 3563 | |
| 3564 #endif /* PNG_VERSION_INFO_ONLY */ | |
| 3565 /* Do not put anything past this line */ | |
| 3566 #endif /* PNG_H */ | |
| OLD | NEW |
|---|
Chromium Code Reviews
Issue 1591483003:
XFA: Upgrade libpng to 1.6.20. (Closed)
Base URL: https://pdfium.googlesource.com/pdfium.git@xfa