The Android Open Source Project | 893912b | 2009-03-03 19:30:05 -0800 | [diff] [blame^] | 1 | /* png.h - header file for PNG reference library |
| 2 | * |
| 3 | * libpng version 1.2.29 - May 8, 2008 |
| 4 | * Copyright (c) 1998-2008 Glenn Randers-Pehrson |
| 5 | * (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger) |
| 6 | * (Version 0.88 Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.) |
| 7 | * |
| 8 | * Authors and maintainers: |
| 9 | * libpng versions 0.71, May 1995, through 0.88, January 1996: Guy Schalnat |
| 10 | * libpng versions 0.89c, June 1996, through 0.96, May 1997: Andreas Dilger |
| 11 | * libpng versions 0.97, January 1998, through 1.2.29 - May 8, 2008: Glenn |
| 12 | * See also "Contributing Authors", below. |
| 13 | * |
| 14 | * Note about libpng version numbers: |
| 15 | * |
| 16 | * Due to various miscommunications, unforeseen code incompatibilities |
| 17 | * and occasional factors outside the authors' control, version numbering |
| 18 | * on the library has not always been consistent and straightforward. |
| 19 | * The following table summarizes matters since version 0.89c, which was |
| 20 | * the first widely used release: |
| 21 | * |
| 22 | * source png.h png.h shared-lib |
| 23 | * version string int version |
| 24 | * ------- ------ ----- ---------- |
| 25 | * 0.89c "1.0 beta 3" 0.89 89 1.0.89 |
| 26 | * 0.90 "1.0 beta 4" 0.90 90 0.90 [should have been 2.0.90] |
| 27 | * 0.95 "1.0 beta 5" 0.95 95 0.95 [should have been 2.0.95] |
| 28 | * 0.96 "1.0 beta 6" 0.96 96 0.96 [should have been 2.0.96] |
| 29 | * 0.97b "1.00.97 beta 7" 1.00.97 97 1.0.1 [should have been 2.0.97] |
| 30 | * 0.97c 0.97 97 2.0.97 |
| 31 | * 0.98 0.98 98 2.0.98 |
| 32 | * 0.99 0.99 98 2.0.99 |
| 33 | * 0.99a-m 0.99 99 2.0.99 |
| 34 | * 1.00 1.00 100 2.1.0 [100 should be 10000] |
| 35 | * 1.0.0 (from here on, the 100 2.1.0 [100 should be 10000] |
| 36 | * 1.0.1 png.h string is 10001 2.1.0 |
| 37 | * 1.0.1a-e identical to the 10002 from here on, the shared library |
| 38 | * 1.0.2 source version) 10002 is 2.V where V is the source code |
| 39 | * 1.0.2a-b 10003 version, except as noted. |
| 40 | * 1.0.3 10003 |
| 41 | * 1.0.3a-d 10004 |
| 42 | * 1.0.4 10004 |
| 43 | * 1.0.4a-f 10005 |
| 44 | * 1.0.5 (+ 2 patches) 10005 |
| 45 | * 1.0.5a-d 10006 |
| 46 | * 1.0.5e-r 10100 (not source compatible) |
| 47 | * 1.0.5s-v 10006 (not binary compatible) |
| 48 | * 1.0.6 (+ 3 patches) 10006 (still binary incompatible) |
| 49 | * 1.0.6d-f 10007 (still binary incompatible) |
| 50 | * 1.0.6g 10007 |
| 51 | * 1.0.6h 10007 10.6h (testing xy.z so-numbering) |
| 52 | * 1.0.6i 10007 10.6i |
| 53 | * 1.0.6j 10007 2.1.0.6j (incompatible with 1.0.0) |
| 54 | * 1.0.7beta11-14 DLLNUM 10007 2.1.0.7beta11-14 (binary compatible) |
| 55 | * 1.0.7beta15-18 1 10007 2.1.0.7beta15-18 (binary compatible) |
| 56 | * 1.0.7rc1-2 1 10007 2.1.0.7rc1-2 (binary compatible) |
| 57 | * 1.0.7 1 10007 (still compatible) |
| 58 | * 1.0.8beta1-4 1 10008 2.1.0.8beta1-4 |
| 59 | * 1.0.8rc1 1 10008 2.1.0.8rc1 |
| 60 | * 1.0.8 1 10008 2.1.0.8 |
| 61 | * 1.0.9beta1-6 1 10009 2.1.0.9beta1-6 |
| 62 | * 1.0.9rc1 1 10009 2.1.0.9rc1 |
| 63 | * 1.0.9beta7-10 1 10009 2.1.0.9beta7-10 |
| 64 | * 1.0.9rc2 1 10009 2.1.0.9rc2 |
| 65 | * 1.0.9 1 10009 2.1.0.9 |
| 66 | * 1.0.10beta1 1 10010 2.1.0.10beta1 |
| 67 | * 1.0.10rc1 1 10010 2.1.0.10rc1 |
| 68 | * 1.0.10 1 10010 2.1.0.10 |
| 69 | * 1.0.11beta1-3 1 10011 2.1.0.11beta1-3 |
| 70 | * 1.0.11rc1 1 10011 2.1.0.11rc1 |
| 71 | * 1.0.11 1 10011 2.1.0.11 |
| 72 | * 1.0.12beta1-2 2 10012 2.1.0.12beta1-2 |
| 73 | * 1.0.12rc1 2 10012 2.1.0.12rc1 |
| 74 | * 1.0.12 2 10012 2.1.0.12 |
| 75 | * 1.1.0a-f - 10100 2.1.1.0a-f (branch abandoned) |
| 76 | * 1.2.0beta1-2 2 10200 2.1.2.0beta1-2 |
| 77 | * 1.2.0beta3-5 3 10200 3.1.2.0beta3-5 |
| 78 | * 1.2.0rc1 3 10200 3.1.2.0rc1 |
| 79 | * 1.2.0 3 10200 3.1.2.0 |
| 80 | * 1.2.1beta1-4 3 10201 3.1.2.1beta1-4 |
| 81 | * 1.2.1rc1-2 3 10201 3.1.2.1rc1-2 |
| 82 | * 1.2.1 3 10201 3.1.2.1 |
| 83 | * 1.2.2beta1-6 12 10202 12.so.0.1.2.2beta1-6 |
| 84 | * 1.0.13beta1 10 10013 10.so.0.1.0.13beta1 |
| 85 | * 1.0.13rc1 10 10013 10.so.0.1.0.13rc1 |
| 86 | * 1.2.2rc1 12 10202 12.so.0.1.2.2rc1 |
| 87 | * 1.0.13 10 10013 10.so.0.1.0.13 |
| 88 | * 1.2.2 12 10202 12.so.0.1.2.2 |
| 89 | * 1.2.3rc1-6 12 10203 12.so.0.1.2.3rc1-6 |
| 90 | * 1.2.3 12 10203 12.so.0.1.2.3 |
| 91 | * 1.2.4beta1-3 13 10204 12.so.0.1.2.4beta1-3 |
| 92 | * 1.0.14rc1 13 10014 10.so.0.1.0.14rc1 |
| 93 | * 1.2.4rc1 13 10204 12.so.0.1.2.4rc1 |
| 94 | * 1.0.14 10 10014 10.so.0.1.0.14 |
| 95 | * 1.2.4 13 10204 12.so.0.1.2.4 |
| 96 | * 1.2.5beta1-2 13 10205 12.so.0.1.2.5beta1-2 |
| 97 | * 1.0.15rc1-3 10 10015 10.so.0.1.0.15rc1-3 |
| 98 | * 1.2.5rc1-3 13 10205 12.so.0.1.2.5rc1-3 |
| 99 | * 1.0.15 10 10015 10.so.0.1.0.15 |
| 100 | * 1.2.5 13 10205 12.so.0.1.2.5 |
| 101 | * 1.2.6beta1-4 13 10206 12.so.0.1.2.6beta1-4 |
| 102 | * 1.0.16 10 10016 10.so.0.1.0.16 |
| 103 | * 1.2.6 13 10206 12.so.0.1.2.6 |
| 104 | * 1.2.7beta1-2 13 10207 12.so.0.1.2.7beta1-2 |
| 105 | * 1.0.17rc1 10 10017 10.so.0.1.0.17rc1 |
| 106 | * 1.2.7rc1 13 10207 12.so.0.1.2.7rc1 |
| 107 | * 1.0.17 10 10017 10.so.0.1.0.17 |
| 108 | * 1.2.7 13 10207 12.so.0.1.2.7 |
| 109 | * 1.2.8beta1-5 13 10208 12.so.0.1.2.8beta1-5 |
| 110 | * 1.0.18rc1-5 10 10018 10.so.0.1.0.18rc1-5 |
| 111 | * 1.2.8rc1-5 13 10208 12.so.0.1.2.8rc1-5 |
| 112 | * 1.0.18 10 10018 10.so.0.1.0.18 |
| 113 | * 1.2.8 13 10208 12.so.0.1.2.8 |
| 114 | * 1.2.9beta1-3 13 10209 12.so.0.1.2.9beta1-3 |
| 115 | * 1.2.9beta4-11 13 10209 12.so.0.9[.0] |
| 116 | * 1.2.9rc1 13 10209 12.so.0.9[.0] |
| 117 | * 1.2.9 13 10209 12.so.0.9[.0] |
| 118 | * 1.2.10beta1-8 13 10210 12.so.0.10[.0] |
| 119 | * 1.2.10rc1-3 13 10210 12.so.0.10[.0] |
| 120 | * 1.2.10 13 10210 12.so.0.10[.0] |
| 121 | * 1.2.11beta1-4 13 10211 12.so.0.11[.0] |
| 122 | * 1.0.19rc1-5 10 10019 10.so.0.19[.0] |
| 123 | * 1.2.11rc1-5 13 10211 12.so.0.11[.0] |
| 124 | * 1.0.19 10 10019 10.so.0.19[.0] |
| 125 | * 1.2.11 13 10211 12.so.0.11[.0] |
| 126 | * 1.0.20 10 10020 10.so.0.20[.0] |
| 127 | * 1.2.12 13 10212 12.so.0.12[.0] |
| 128 | * 1.2.13beta1 13 10213 12.so.0.13[.0] |
| 129 | * 1.0.21 10 10021 10.so.0.21[.0] |
| 130 | * 1.2.13 13 10213 12.so.0.13[.0] |
| 131 | * 1.2.14beta1-2 13 10214 12.so.0.14[.0] |
| 132 | * 1.0.22rc1 10 10022 10.so.0.22[.0] |
| 133 | * 1.2.14rc1 13 10214 12.so.0.14[.0] |
| 134 | * 1.0.22 10 10022 10.so.0.22[.0] |
| 135 | * 1.2.14 13 10214 12.so.0.14[.0] |
| 136 | * 1.2.15beta1-6 13 10215 12.so.0.15[.0] |
| 137 | * 1.0.23rc1-5 10 10023 10.so.0.23[.0] |
| 138 | * 1.2.15rc1-5 13 10215 12.so.0.15[.0] |
| 139 | * 1.0.23 10 10023 10.so.0.23[.0] |
| 140 | * 1.2.15 13 10215 12.so.0.15[.0] |
| 141 | * 1.2.16beta1-2 13 10216 12.so.0.16[.0] |
| 142 | * 1.2.16rc1 13 10216 12.so.0.16[.0] |
| 143 | * 1.0.24 10 10024 10.so.0.24[.0] |
| 144 | * 1.2.16 13 10216 12.so.0.16[.0] |
| 145 | * 1.2.17beta1-2 13 10217 12.so.0.17[.0] |
| 146 | * 1.0.25rc1 10 10025 10.so.0.25[.0] |
| 147 | * 1.2.17rc1-3 13 10217 12.so.0.17[.0] |
| 148 | * 1.0.25 10 10025 10.so.0.25[.0] |
| 149 | * 1.2.17 13 10217 12.so.0.17[.0] |
| 150 | * 1.0.26 10 10026 10.so.0.26[.0] |
| 151 | * 1.2.18 13 10218 12.so.0.18[.0] |
| 152 | * 1.2.19beta1-31 13 10219 12.so.0.19[.0] |
| 153 | * 1.0.27rc1-6 10 10027 10.so.0.27[.0] |
| 154 | * 1.2.19rc1-6 13 10219 12.so.0.19[.0] |
| 155 | * 1.0.27 10 10027 10.so.0.27[.0] |
| 156 | * 1.2.19 13 10219 12.so.0.19[.0] |
| 157 | * 1.2.20beta01-04 13 10220 12.so.0.20[.0] |
| 158 | * 1.0.28rc1-6 10 10028 10.so.0.28[.0] |
| 159 | * 1.2.20rc1-6 13 10220 12.so.0.20[.0] |
| 160 | * 1.0.28 10 10028 10.so.0.28[.0] |
| 161 | * 1.2.20 13 10220 12.so.0.20[.0] |
| 162 | * 1.2.21beta1-2 13 10221 12.so.0.21[.0] |
| 163 | * 1.2.21rc1-3 13 10221 12.so.0.21[.0] |
| 164 | * 1.0.29 10 10029 10.so.0.29[.0] |
| 165 | * 1.2.21 13 10221 12.so.0.21[.0] |
| 166 | * 1.2.22beta1-4 13 10222 12.so.0.22[.0] |
| 167 | * 1.0.30rc1 10 10030 10.so.0.30[.0] |
| 168 | * 1.2.22rc1 13 10222 12.so.0.22[.0] |
| 169 | * 1.0.30 10 10030 10.so.0.30[.0] |
| 170 | * 1.2.22 13 10222 12.so.0.22[.0] |
| 171 | * 1.2.23beta01-05 13 10223 12.so.0.23[.0] |
| 172 | * 1.2.23rc01 13 10223 12.so.0.23[.0] |
| 173 | * 1.2.23 13 10223 12.so.0.23[.0] |
| 174 | * 1.2.24beta01-02 13 10224 12.so.0.24[.0] |
| 175 | * 1.2.24rc01 13 10224 12.so.0.24[.0] |
| 176 | * 1.2.24 13 10224 12.so.0.24[.0] |
| 177 | * 1.2.25beta01-06 13 10225 12.so.0.25[.0] |
| 178 | * 1.2.25rc01-02 13 10225 12.so.0.25[.0] |
| 179 | * 1.0.31 10 10031 10.so.0.31[.0] |
| 180 | * 1.2.25 13 10225 12.so.0.25[.0] |
| 181 | * 1.2.26beta01-06 13 10226 12.so.0.26[.0] |
| 182 | * 1.2.26rc01 13 10226 12.so.0.26[.0] |
| 183 | * 1.2.26 13 10226 12.so.0.26[.0] |
| 184 | * 1.0.32 10 10032 10.so.0.32[.0] |
| 185 | * 1.2.27beta01-06 13 10227 12.so.0.27[.0] |
| 186 | * 1.2.27rc01 13 10227 12.so.0.27[.0] |
| 187 | * 1.0.33 10 10033 10.so.0.33[.0] |
| 188 | * 1.2.27 13 10227 12.so.0.27[.0] |
| 189 | * 1.0.34 10 10034 10.so.0.34[.0] |
| 190 | * 1.2.28 13 10228 12.so.0.28[.0] |
| 191 | * 1.2.29beta01-03 13 10229 12.so.0.29[.0] |
| 192 | * 1.2.29rc01 13 10229 12.so.0.29[.0] |
| 193 | * 1.0.35 10 10035 10.so.0.35[.0] |
| 194 | * 1.2.29 13 10229 12.so.0.29[.0] |
| 195 | * |
| 196 | * Henceforth the source version will match the shared-library major |
| 197 | * and minor numbers; the shared-library major version number will be |
| 198 | * used for changes in backward compatibility, as it is intended. The |
| 199 | * PNG_LIBPNG_VER macro, which is not used within libpng but is available |
| 200 | * for applications, is an unsigned integer of the form xyyzz corresponding |
| 201 | * to the source version x.y.z (leading zeros in y and z). Beta versions |
| 202 | * were given the previous public release number plus a letter, until |
| 203 | * version 1.0.6j; from then on they were given the upcoming public |
| 204 | * release number plus "betaNN" or "rcNN". |
| 205 | * |
| 206 | * Binary incompatibility exists only when applications make direct access |
| 207 | * to the info_ptr or png_ptr members through png.h, and the compiled |
| 208 | * application is loaded with a different version of the library. |
| 209 | * |
| 210 | * DLLNUM will change each time there are forward or backward changes |
| 211 | * in binary compatibility (e.g., when a new feature is added). |
| 212 | * |
| 213 | * See libpng.txt or libpng.3 for more information. The PNG specification |
| 214 | * is available as a W3C Recommendation and as an ISO Specification, |
| 215 | * <http://www.w3.org/TR/2003/REC-PNG-20031110/ |
| 216 | */ |
| 217 | |
| 218 | /* |
| 219 | * COPYRIGHT NOTICE, DISCLAIMER, and LICENSE: |
| 220 | * |
| 221 | * If you modify libpng you may insert additional notices immediately following |
| 222 | * this sentence. |
| 223 | * |
| 224 | * libpng versions 1.2.6, August 15, 2004, through 1.2.29, May 8, 2008, are |
| 225 | * Copyright (c) 2004, 2006-2008 Glenn Randers-Pehrson, and are |
| 226 | * distributed according to the same disclaimer and license as libpng-1.2.5 |
| 227 | * with the following individual added to the list of Contributing Authors: |
| 228 | * |
| 229 | * Cosmin Truta |
| 230 | * |
| 231 | * libpng versions 1.0.7, July 1, 2000, through 1.2.5, October 3, 2002, are |
| 232 | * Copyright (c) 2000-2002 Glenn Randers-Pehrson, and are |
| 233 | * distributed according to the same disclaimer and license as libpng-1.0.6 |
| 234 | * with the following individuals added to the list of Contributing Authors: |
| 235 | * |
| 236 | * Simon-Pierre Cadieux |
| 237 | * Eric S. Raymond |
| 238 | * Gilles Vollant |
| 239 | * |
| 240 | * and with the following additions to the disclaimer: |
| 241 | * |
| 242 | * There is no warranty against interference with your enjoyment of the |
| 243 | * library or against infringement. There is no warranty that our |
| 244 | * efforts or the library will fulfill any of your particular purposes |
| 245 | * or needs. This library is provided with all faults, and the entire |
| 246 | * risk of satisfactory quality, performance, accuracy, and effort is with |
| 247 | * the user. |
| 248 | * |
| 249 | * libpng versions 0.97, January 1998, through 1.0.6, March 20, 2000, are |
| 250 | * Copyright (c) 1998, 1999, 2000 Glenn Randers-Pehrson, and are |
| 251 | * distributed according to the same disclaimer and license as libpng-0.96, |
| 252 | * with the following individuals added to the list of Contributing Authors: |
| 253 | * |
| 254 | * Tom Lane |
| 255 | * Glenn Randers-Pehrson |
| 256 | * Willem van Schaik |
| 257 | * |
| 258 | * libpng versions 0.89, June 1996, through 0.96, May 1997, are |
| 259 | * Copyright (c) 1996, 1997 Andreas Dilger |
| 260 | * Distributed according to the same disclaimer and license as libpng-0.88, |
| 261 | * with the following individuals added to the list of Contributing Authors: |
| 262 | * |
| 263 | * John Bowler |
| 264 | * Kevin Bracey |
| 265 | * Sam Bushell |
| 266 | * Magnus Holmgren |
| 267 | * Greg Roelofs |
| 268 | * Tom Tanner |
| 269 | * |
| 270 | * libpng versions 0.5, May 1995, through 0.88, January 1996, are |
| 271 | * Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc. |
| 272 | * |
| 273 | * For the purposes of this copyright and license, "Contributing Authors" |
| 274 | * is defined as the following set of individuals: |
| 275 | * |
| 276 | * Andreas Dilger |
| 277 | * Dave Martindale |
| 278 | * Guy Eric Schalnat |
| 279 | * Paul Schmidt |
| 280 | * Tim Wegner |
| 281 | * |
| 282 | * The PNG Reference Library is supplied "AS IS". The Contributing Authors |
| 283 | * and Group 42, Inc. disclaim all warranties, expressed or implied, |
| 284 | * including, without limitation, the warranties of merchantability and of |
| 285 | * fitness for any purpose. The Contributing Authors and Group 42, Inc. |
| 286 | * assume no liability for direct, indirect, incidental, special, exemplary, |
| 287 | * or consequential damages, which may result from the use of the PNG |
| 288 | * Reference Library, even if advised of the possibility of such damage. |
| 289 | * |
| 290 | * Permission is hereby granted to use, copy, modify, and distribute this |
| 291 | * source code, or portions hereof, for any purpose, without fee, subject |
| 292 | * to the following restrictions: |
| 293 | * |
| 294 | * 1. The origin of this source code must not be misrepresented. |
| 295 | * |
| 296 | * 2. Altered versions must be plainly marked as such and |
| 297 | * must not be misrepresented as being the original source. |
| 298 | * |
| 299 | * 3. This Copyright notice may not be removed or altered from |
| 300 | * any source or altered source distribution. |
| 301 | * |
| 302 | * The Contributing Authors and Group 42, Inc. specifically permit, without |
| 303 | * fee, and encourage the use of this source code as a component to |
| 304 | * supporting the PNG file format in commercial products. If you use this |
| 305 | * source code in a product, acknowledgment is not required but would be |
| 306 | * appreciated. |
| 307 | */ |
| 308 | |
| 309 | /* |
| 310 | * A "png_get_copyright" function is available, for convenient use in "about" |
| 311 | * boxes and the like: |
| 312 | * |
| 313 | * printf("%s",png_get_copyright(NULL)); |
| 314 | * |
| 315 | * Also, the PNG logo (in PNG format, of course) is supplied in the |
| 316 | * files "pngbar.png" and "pngbar.jpg (88x31) and "pngnow.png" (98x31). |
| 317 | */ |
| 318 | |
| 319 | /* |
| 320 | * Libpng is OSI Certified Open Source Software. OSI Certified is a |
| 321 | * certification mark of the Open Source Initiative. |
| 322 | */ |
| 323 | |
| 324 | /* |
| 325 | * The contributing authors would like to thank all those who helped |
| 326 | * with testing, bug fixes, and patience. This wouldn't have been |
| 327 | * possible without all of you. |
| 328 | * |
| 329 | * Thanks to Frank J. T. Wojcik for helping with the documentation. |
| 330 | */ |
| 331 | |
| 332 | /* |
| 333 | * Y2K compliance in libpng: |
| 334 | * ========================= |
| 335 | * |
| 336 | * May 8, 2008 |
| 337 | * |
| 338 | * Since the PNG Development group is an ad-hoc body, we can't make |
| 339 | * an official declaration. |
| 340 | * |
| 341 | * This is your unofficial assurance that libpng from version 0.71 and |
| 342 | * upward through 1.2.29 are Y2K compliant. It is my belief that earlier |
| 343 | * versions were also Y2K compliant. |
| 344 | * |
| 345 | * Libpng only has three year fields. One is a 2-byte unsigned integer |
| 346 | * that will hold years up to 65535. The other two hold the date in text |
| 347 | * format, and will hold years up to 9999. |
| 348 | * |
| 349 | * The integer is |
| 350 | * "png_uint_16 year" in png_time_struct. |
| 351 | * |
| 352 | * The strings are |
| 353 | * "png_charp time_buffer" in png_struct and |
| 354 | * "near_time_buffer", which is a local character string in png.c. |
| 355 | * |
| 356 | * There are seven time-related functions: |
| 357 | * png.c: png_convert_to_rfc_1123() in png.c |
| 358 | * (formerly png_convert_to_rfc_1152() in error) |
| 359 | * png_convert_from_struct_tm() in pngwrite.c, called in pngwrite.c |
| 360 | * png_convert_from_time_t() in pngwrite.c |
| 361 | * png_get_tIME() in pngget.c |
| 362 | * png_handle_tIME() in pngrutil.c, called in pngread.c |
| 363 | * png_set_tIME() in pngset.c |
| 364 | * png_write_tIME() in pngwutil.c, called in pngwrite.c |
| 365 | * |
| 366 | * All handle dates properly in a Y2K environment. The |
| 367 | * png_convert_from_time_t() function calls gmtime() to convert from system |
| 368 | * clock time, which returns (year - 1900), which we properly convert to |
| 369 | * the full 4-digit year. There is a possibility that applications using |
| 370 | * libpng are not passing 4-digit years into the png_convert_to_rfc_1123() |
| 371 | * function, or that they are incorrectly passing only a 2-digit year |
| 372 | * instead of "year - 1900" into the png_convert_from_struct_tm() function, |
| 373 | * but this is not under our control. The libpng documentation has always |
| 374 | * stated that it works with 4-digit years, and the APIs have been |
| 375 | * documented as such. |
| 376 | * |
| 377 | * The tIME chunk itself is also Y2K compliant. It uses a 2-byte unsigned |
| 378 | * integer to hold the year, and can hold years as large as 65535. |
| 379 | * |
| 380 | * zlib, upon which libpng depends, is also Y2K compliant. It contains |
| 381 | * no date-related code. |
| 382 | * |
| 383 | * Glenn Randers-Pehrson |
| 384 | * libpng maintainer |
| 385 | * PNG Development Group |
| 386 | */ |
| 387 | |
| 388 | #ifndef PNG_H |
| 389 | #define PNG_H |
| 390 | |
| 391 | /* This is not the place to learn how to use libpng. The file libpng.txt |
| 392 | * describes how to use libpng, and the file example.c summarizes it |
| 393 | * with some code on which to build. This file is useful for looking |
| 394 | * at the actual function definitions and structure components. |
| 395 | */ |
| 396 | |
| 397 | /* Version information for png.h - this should match the version in png.c */ |
| 398 | #define PNG_LIBPNG_VER_STRING "1.2.29" |
| 399 | #define PNG_HEADER_VERSION_STRING \ |
| 400 | " libpng version 1.2.29 - May 8, 2008\n" |
| 401 | |
| 402 | #define PNG_LIBPNG_VER_SONUM 0 |
| 403 | #define PNG_LIBPNG_VER_DLLNUM 13 |
| 404 | |
| 405 | /* These should match the first 3 components of PNG_LIBPNG_VER_STRING: */ |
| 406 | #define PNG_LIBPNG_VER_MAJOR 1 |
| 407 | #define PNG_LIBPNG_VER_MINOR 2 |
| 408 | #define PNG_LIBPNG_VER_RELEASE 29 |
| 409 | /* This should match the numeric part of the final component of |
| 410 | * PNG_LIBPNG_VER_STRING, omitting any leading zero: */ |
| 411 | |
| 412 | #define PNG_LIBPNG_VER_BUILD 0 |
| 413 | |
| 414 | /* Release Status */ |
| 415 | #define PNG_LIBPNG_BUILD_ALPHA 1 |
| 416 | #define PNG_LIBPNG_BUILD_BETA 2 |
| 417 | #define PNG_LIBPNG_BUILD_RC 3 |
| 418 | #define PNG_LIBPNG_BUILD_STABLE 4 |
| 419 | #define PNG_LIBPNG_BUILD_RELEASE_STATUS_MASK 7 |
| 420 | |
| 421 | /* Release-Specific Flags */ |
| 422 | #define PNG_LIBPNG_BUILD_PATCH 8 /* Can be OR'ed with |
| 423 | PNG_LIBPNG_BUILD_STABLE only */ |
| 424 | #define PNG_LIBPNG_BUILD_PRIVATE 16 /* Cannot be OR'ed with |
| 425 | PNG_LIBPNG_BUILD_SPECIAL */ |
| 426 | #define PNG_LIBPNG_BUILD_SPECIAL 32 /* Cannot be OR'ed with |
| 427 | PNG_LIBPNG_BUILD_PRIVATE */ |
| 428 | |
| 429 | #define PNG_LIBPNG_BUILD_BASE_TYPE PNG_LIBPNG_BUILD_STABLE |
| 430 | |
| 431 | /* Careful here. At one time, Guy wanted to use 082, but that would be octal. |
| 432 | * We must not include leading zeros. |
| 433 | * Versions 0.7 through 1.0.0 were in the range 0 to 100 here (only |
| 434 | * version 1.0.0 was mis-numbered 100 instead of 10000). From |
| 435 | * version 1.0.1 it's xxyyzz, where x=major, y=minor, z=release */ |
| 436 | #define PNG_LIBPNG_VER 10229 /* 1.2.29 */ |
| 437 | |
| 438 | #ifndef PNG_VERSION_INFO_ONLY |
| 439 | /* include the compression library's header */ |
| 440 | #include "zlib.h" |
| 441 | #endif |
| 442 | |
| 443 | /* include all user configurable info, including optional assembler routines */ |
| 444 | #include "pngconf.h" |
| 445 | |
| 446 | /* |
| 447 | * Added at libpng-1.2.8 */ |
| 448 | /* Ref MSDN: Private as priority over Special |
| 449 | * VS_FF_PRIVATEBUILD File *was not* built using standard release |
| 450 | * procedures. If this value is given, the StringFileInfo block must |
| 451 | * contain a PrivateBuild string. |
| 452 | * |
| 453 | * VS_FF_SPECIALBUILD File *was* built by the original company using |
| 454 | * standard release procedures but is a variation of the standard |
| 455 | * file of the same version number. If this value is given, the |
| 456 | * StringFileInfo block must contain a SpecialBuild string. |
| 457 | */ |
| 458 | |
| 459 | #if defined(PNG_USER_PRIVATEBUILD) |
| 460 | # define PNG_LIBPNG_BUILD_TYPE \ |
| 461 | (PNG_LIBPNG_BUILD_BASE_TYPE | PNG_LIBPNG_BUILD_PRIVATE) |
| 462 | #else |
| 463 | # if defined(PNG_LIBPNG_SPECIALBUILD) |
| 464 | # define PNG_LIBPNG_BUILD_TYPE \ |
| 465 | (PNG_LIBPNG_BUILD_BASE_TYPE | PNG_LIBPNG_BUILD_SPECIAL) |
| 466 | # else |
| 467 | # define PNG_LIBPNG_BUILD_TYPE (PNG_LIBPNG_BUILD_BASE_TYPE) |
| 468 | # endif |
| 469 | #endif |
| 470 | |
| 471 | #ifndef PNG_VERSION_INFO_ONLY |
| 472 | |
| 473 | /* Inhibit C++ name-mangling for libpng functions but not for system calls. */ |
| 474 | #ifdef __cplusplus |
| 475 | extern "C" { |
| 476 | #endif /* __cplusplus */ |
| 477 | |
| 478 | /* This file is arranged in several sections. The first section contains |
| 479 | * structure and type definitions. The second section contains the external |
| 480 | * library functions, while the third has the internal library functions, |
| 481 | * which applications aren't expected to use directly. |
| 482 | */ |
| 483 | |
| 484 | #ifndef PNG_NO_TYPECAST_NULL |
| 485 | #define int_p_NULL (int *)NULL |
| 486 | #define png_bytep_NULL (png_bytep)NULL |
| 487 | #define png_bytepp_NULL (png_bytepp)NULL |
| 488 | #define png_doublep_NULL (png_doublep)NULL |
| 489 | #define png_error_ptr_NULL (png_error_ptr)NULL |
| 490 | #define png_flush_ptr_NULL (png_flush_ptr)NULL |
| 491 | #define png_free_ptr_NULL (png_free_ptr)NULL |
| 492 | #define png_infopp_NULL (png_infopp)NULL |
| 493 | #define png_malloc_ptr_NULL (png_malloc_ptr)NULL |
| 494 | #define png_read_status_ptr_NULL (png_read_status_ptr)NULL |
| 495 | #define png_rw_ptr_NULL (png_rw_ptr)NULL |
| 496 | #define png_structp_NULL (png_structp)NULL |
| 497 | #define png_uint_16p_NULL (png_uint_16p)NULL |
| 498 | #define png_voidp_NULL (png_voidp)NULL |
| 499 | #define png_write_status_ptr_NULL (png_write_status_ptr)NULL |
| 500 | #else |
| 501 | #define int_p_NULL NULL |
| 502 | #define png_bytep_NULL NULL |
| 503 | #define png_bytepp_NULL NULL |
| 504 | #define png_doublep_NULL NULL |
| 505 | #define png_error_ptr_NULL NULL |
| 506 | #define png_flush_ptr_NULL NULL |
| 507 | #define png_free_ptr_NULL NULL |
| 508 | #define png_infopp_NULL NULL |
| 509 | #define png_malloc_ptr_NULL NULL |
| 510 | #define png_read_status_ptr_NULL NULL |
| 511 | #define png_rw_ptr_NULL NULL |
| 512 | #define png_structp_NULL NULL |
| 513 | #define png_uint_16p_NULL NULL |
| 514 | #define png_voidp_NULL NULL |
| 515 | #define png_write_status_ptr_NULL NULL |
| 516 | #endif |
| 517 | |
| 518 | /* variables declared in png.c - only it needs to define PNG_NO_EXTERN */ |
| 519 | #if !defined(PNG_NO_EXTERN) || defined(PNG_ALWAYS_EXTERN) |
| 520 | /* Version information for C files, stored in png.c. This had better match |
| 521 | * the version above. |
| 522 | */ |
| 523 | #ifdef PNG_USE_GLOBAL_ARRAYS |
| 524 | PNG_EXPORT_VAR (PNG_CONST char) png_libpng_ver[18]; |
| 525 | /* need room for 99.99.99beta99z */ |
| 526 | #else |
| 527 | #define png_libpng_ver png_get_header_ver(NULL) |
| 528 | #endif |
| 529 | |
| 530 | #ifdef PNG_USE_GLOBAL_ARRAYS |
| 531 | /* This was removed in version 1.0.5c */ |
| 532 | /* Structures to facilitate easy interlacing. See png.c for more details */ |
| 533 | PNG_EXPORT_VAR (PNG_CONST int FARDATA) png_pass_start[7]; |
| 534 | PNG_EXPORT_VAR (PNG_CONST int FARDATA) png_pass_inc[7]; |
| 535 | PNG_EXPORT_VAR (PNG_CONST int FARDATA) png_pass_ystart[7]; |
| 536 | PNG_EXPORT_VAR (PNG_CONST int FARDATA) png_pass_yinc[7]; |
| 537 | PNG_EXPORT_VAR (PNG_CONST int FARDATA) png_pass_mask[7]; |
| 538 | PNG_EXPORT_VAR (PNG_CONST int FARDATA) png_pass_dsp_mask[7]; |
| 539 | /* This isn't currently used. If you need it, see png.c for more details. |
| 540 | PNG_EXPORT_VAR (PNG_CONST int FARDATA) png_pass_height[7]; |
| 541 | */ |
| 542 | #endif |
| 543 | |
| 544 | #endif /* PNG_NO_EXTERN */ |
| 545 | |
| 546 | /* Three color definitions. The order of the red, green, and blue, (and the |
| 547 | * exact size) is not important, although the size of the fields need to |
| 548 | * be png_byte or png_uint_16 (as defined below). |
| 549 | */ |
| 550 | typedef struct png_color_struct |
| 551 | { |
| 552 | png_byte red; |
| 553 | png_byte green; |
| 554 | png_byte blue; |
| 555 | } png_color; |
| 556 | typedef png_color FAR * png_colorp; |
| 557 | typedef png_color FAR * FAR * png_colorpp; |
| 558 | |
| 559 | typedef struct png_color_16_struct |
| 560 | { |
| 561 | png_byte index; /* used for palette files */ |
| 562 | png_uint_16 red; /* for use in red green blue files */ |
| 563 | png_uint_16 green; |
| 564 | png_uint_16 blue; |
| 565 | png_uint_16 gray; /* for use in grayscale files */ |
| 566 | } png_color_16; |
| 567 | typedef png_color_16 FAR * png_color_16p; |
| 568 | typedef png_color_16 FAR * FAR * png_color_16pp; |
| 569 | |
| 570 | typedef struct png_color_8_struct |
| 571 | { |
| 572 | png_byte red; /* for use in red green blue files */ |
| 573 | png_byte green; |
| 574 | png_byte blue; |
| 575 | png_byte gray; /* for use in grayscale files */ |
| 576 | png_byte alpha; /* for alpha channel files */ |
| 577 | } png_color_8; |
| 578 | typedef png_color_8 FAR * png_color_8p; |
| 579 | typedef png_color_8 FAR * FAR * png_color_8pp; |
| 580 | |
| 581 | /* |
| 582 | * The following two structures are used for the in-core representation |
| 583 | * of sPLT chunks. |
| 584 | */ |
| 585 | typedef struct png_sPLT_entry_struct |
| 586 | { |
| 587 | png_uint_16 red; |
| 588 | png_uint_16 green; |
| 589 | png_uint_16 blue; |
| 590 | png_uint_16 alpha; |
| 591 | png_uint_16 frequency; |
| 592 | } png_sPLT_entry; |
| 593 | typedef png_sPLT_entry FAR * png_sPLT_entryp; |
| 594 | typedef png_sPLT_entry FAR * FAR * png_sPLT_entrypp; |
| 595 | |
| 596 | /* When the depth of the sPLT palette is 8 bits, the color and alpha samples |
| 597 | * occupy the LSB of their respective members, and the MSB of each member |
| 598 | * is zero-filled. The frequency member always occupies the full 16 bits. |
| 599 | */ |
| 600 | |
| 601 | typedef struct png_sPLT_struct |
| 602 | { |
| 603 | png_charp name; /* palette name */ |
| 604 | png_byte depth; /* depth of palette samples */ |
| 605 | png_sPLT_entryp entries; /* palette entries */ |
| 606 | png_int_32 nentries; /* number of palette entries */ |
| 607 | } png_sPLT_t; |
| 608 | typedef png_sPLT_t FAR * png_sPLT_tp; |
| 609 | typedef png_sPLT_t FAR * FAR * png_sPLT_tpp; |
| 610 | |
| 611 | #ifdef PNG_TEXT_SUPPORTED |
| 612 | /* png_text holds the contents of a text/ztxt/itxt chunk in a PNG file, |
| 613 | * and whether that contents is compressed or not. The "key" field |
| 614 | * points to a regular zero-terminated C string. The "text", "lang", and |
| 615 | * "lang_key" fields can be regular C strings, empty strings, or NULL pointers. |
| 616 | * However, the * structure returned by png_get_text() will always contain |
| 617 | * regular zero-terminated C strings (possibly empty), never NULL pointers, |
| 618 | * so they can be safely used in printf() and other string-handling functions. |
| 619 | */ |
| 620 | typedef struct png_text_struct |
| 621 | { |
| 622 | int compression; /* compression value: |
| 623 | -1: tEXt, none |
| 624 | 0: zTXt, deflate |
| 625 | 1: iTXt, none |
| 626 | 2: iTXt, deflate */ |
| 627 | png_charp key; /* keyword, 1-79 character description of "text" */ |
| 628 | png_charp text; /* comment, may be an empty string (ie "") |
| 629 | or a NULL pointer */ |
| 630 | png_size_t text_length; /* length of the text string */ |
| 631 | #ifdef PNG_iTXt_SUPPORTED |
| 632 | png_size_t itxt_length; /* length of the itxt string */ |
| 633 | png_charp lang; /* language code, 0-79 characters |
| 634 | or a NULL pointer */ |
| 635 | png_charp lang_key; /* keyword translated UTF-8 string, 0 or more |
| 636 | chars or a NULL pointer */ |
| 637 | #endif |
| 638 | } png_text; |
| 639 | typedef png_text FAR * png_textp; |
| 640 | typedef png_text FAR * FAR * png_textpp; |
| 641 | #endif |
| 642 | |
| 643 | /* Supported compression types for text in PNG files (tEXt, and zTXt). |
| 644 | * The values of the PNG_TEXT_COMPRESSION_ defines should NOT be changed. */ |
| 645 | #define PNG_TEXT_COMPRESSION_NONE_WR -3 |
| 646 | #define PNG_TEXT_COMPRESSION_zTXt_WR -2 |
| 647 | #define PNG_TEXT_COMPRESSION_NONE -1 |
| 648 | #define PNG_TEXT_COMPRESSION_zTXt 0 |
| 649 | #define PNG_ITXT_COMPRESSION_NONE 1 |
| 650 | #define PNG_ITXT_COMPRESSION_zTXt 2 |
| 651 | #define PNG_TEXT_COMPRESSION_LAST 3 /* Not a valid value */ |
| 652 | |
| 653 | /* png_time is a way to hold the time in an machine independent way. |
| 654 | * Two conversions are provided, both from time_t and struct tm. There |
| 655 | * is no portable way to convert to either of these structures, as far |
| 656 | * as I know. If you know of a portable way, send it to me. As a side |
| 657 | * note - PNG has always been Year 2000 compliant! |
| 658 | */ |
| 659 | typedef struct png_time_struct |
| 660 | { |
| 661 | png_uint_16 year; /* full year, as in, 1995 */ |
| 662 | png_byte month; /* month of year, 1 - 12 */ |
| 663 | png_byte day; /* day of month, 1 - 31 */ |
| 664 | png_byte hour; /* hour of day, 0 - 23 */ |
| 665 | png_byte minute; /* minute of hour, 0 - 59 */ |
| 666 | png_byte second; /* second of minute, 0 - 60 (for leap seconds) */ |
| 667 | } png_time; |
| 668 | typedef png_time FAR * png_timep; |
| 669 | typedef png_time FAR * FAR * png_timepp; |
| 670 | |
| 671 | #if defined(PNG_UNKNOWN_CHUNKS_SUPPORTED) |
| 672 | /* png_unknown_chunk is a structure to hold queued chunks for which there is |
| 673 | * no specific support. The idea is that we can use this to queue |
| 674 | * up private chunks for output even though the library doesn't actually |
| 675 | * know about their semantics. |
| 676 | */ |
| 677 | #define PNG_CHUNK_NAME_LENGTH 5 |
| 678 | typedef struct png_unknown_chunk_t |
| 679 | { |
| 680 | png_byte name[PNG_CHUNK_NAME_LENGTH]; |
| 681 | png_byte *data; |
| 682 | png_size_t size; |
| 683 | |
| 684 | /* libpng-using applications should NOT directly modify this byte. */ |
| 685 | png_byte location; /* mode of operation at read time */ |
| 686 | } |
| 687 | png_unknown_chunk; |
| 688 | typedef png_unknown_chunk FAR * png_unknown_chunkp; |
| 689 | typedef png_unknown_chunk FAR * FAR * png_unknown_chunkpp; |
| 690 | #endif |
| 691 | |
| 692 | /* png_info is a structure that holds the information in a PNG file so |
| 693 | * that the application can find out the characteristics of the image. |
| 694 | * If you are reading the file, this structure will tell you what is |
| 695 | * in the PNG file. If you are writing the file, fill in the information |
| 696 | * you want to put into the PNG file, then call png_write_info(). |
| 697 | * The names chosen should be very close to the PNG specification, so |
| 698 | * consult that document for information about the meaning of each field. |
| 699 | * |
| 700 | * With libpng < 0.95, it was only possible to directly set and read the |
| 701 | * the values in the png_info_struct, which meant that the contents and |
| 702 | * order of the values had to remain fixed. With libpng 0.95 and later, |
| 703 | * however, there are now functions that abstract the contents of |
| 704 | * png_info_struct from the application, so this makes it easier to use |
| 705 | * libpng with dynamic libraries, and even makes it possible to use |
| 706 | * libraries that don't have all of the libpng ancillary chunk-handing |
| 707 | * functionality. |
| 708 | * |
| 709 | * In any case, the order of the parameters in png_info_struct should NOT |
| 710 | * be changed for as long as possible to keep compatibility with applications |
| 711 | * that use the old direct-access method with png_info_struct. |
| 712 | * |
| 713 | * The following members may have allocated storage attached that should be |
| 714 | * cleaned up before the structure is discarded: palette, trans, text, |
| 715 | * pcal_purpose, pcal_units, pcal_params, hist, iccp_name, iccp_profile, |
| 716 | * splt_palettes, scal_unit, row_pointers, and unknowns. By default, these |
| 717 | * are automatically freed when the info structure is deallocated, if they were |
| 718 | * allocated internally by libpng. This behavior can be changed by means |
| 719 | * of the png_data_freer() function. |
| 720 | * |
| 721 | * More allocation details: all the chunk-reading functions that |
| 722 | * change these members go through the corresponding png_set_* |
| 723 | * functions. A function to clear these members is available: see |
| 724 | * png_free_data(). The png_set_* functions do not depend on being |
| 725 | * able to point info structure members to any of the storage they are |
| 726 | * passed (they make their own copies), EXCEPT that the png_set_text |
| 727 | * functions use the same storage passed to them in the text_ptr or |
| 728 | * itxt_ptr structure argument, and the png_set_rows and png_set_unknowns |
| 729 | * functions do not make their own copies. |
| 730 | */ |
| 731 | typedef struct png_info_struct |
| 732 | { |
| 733 | /* the following are necessary for every PNG file */ |
| 734 | png_uint_32 width; /* width of image in pixels (from IHDR) */ |
| 735 | png_uint_32 height; /* height of image in pixels (from IHDR) */ |
| 736 | png_uint_32 valid; /* valid chunk data (see PNG_INFO_ below) */ |
| 737 | png_uint_32 rowbytes; /* bytes needed to hold an untransformed row */ |
| 738 | png_colorp palette; /* array of color values (valid & PNG_INFO_PLTE) */ |
| 739 | png_uint_16 num_palette; /* number of color entries in "palette" (PLTE) */ |
| 740 | png_uint_16 num_trans; /* number of transparent palette color (tRNS) */ |
| 741 | png_byte bit_depth; /* 1, 2, 4, 8, or 16 bits/channel (from IHDR) */ |
| 742 | png_byte color_type; /* see PNG_COLOR_TYPE_ below (from IHDR) */ |
| 743 | /* The following three should have been named *_method not *_type */ |
| 744 | png_byte compression_type; /* must be PNG_COMPRESSION_TYPE_BASE (IHDR) */ |
| 745 | png_byte filter_type; /* must be PNG_FILTER_TYPE_BASE (from IHDR) */ |
| 746 | png_byte interlace_type; /* One of PNG_INTERLACE_NONE, PNG_INTERLACE_ADAM7 */ |
| 747 | |
| 748 | /* The following is informational only on read, and not used on writes. */ |
| 749 | png_byte channels; /* number of data channels per pixel (1, 2, 3, 4) */ |
| 750 | png_byte pixel_depth; /* number of bits per pixel */ |
| 751 | png_byte spare_byte; /* to align the data, and for future use */ |
| 752 | png_byte signature[8]; /* magic bytes read by libpng from start of file */ |
| 753 | |
| 754 | /* The rest of the data is optional. If you are reading, check the |
| 755 | * valid field to see if the information in these are valid. If you |
| 756 | * are writing, set the valid field to those chunks you want written, |
| 757 | * and initialize the appropriate fields below. |
| 758 | */ |
| 759 | |
| 760 | #if defined(PNG_gAMA_SUPPORTED) && defined(PNG_FLOATING_POINT_SUPPORTED) |
| 761 | /* The gAMA chunk describes the gamma characteristics of the system |
| 762 | * on which the image was created, normally in the range [1.0, 2.5]. |
| 763 | * Data is valid if (valid & PNG_INFO_gAMA) is non-zero. |
| 764 | */ |
| 765 | float gamma; /* gamma value of image, if (valid & PNG_INFO_gAMA) */ |
| 766 | #endif |
| 767 | |
| 768 | #if defined(PNG_sRGB_SUPPORTED) |
| 769 | /* GR-P, 0.96a */ |
| 770 | /* Data valid if (valid & PNG_INFO_sRGB) non-zero. */ |
| 771 | png_byte srgb_intent; /* sRGB rendering intent [0, 1, 2, or 3] */ |
| 772 | #endif |
| 773 | |
| 774 | #if defined(PNG_TEXT_SUPPORTED) |
| 775 | /* The tEXt, and zTXt chunks contain human-readable textual data in |
| 776 | * uncompressed, compressed, and optionally compressed forms, respectively. |
| 777 | * The data in "text" is an array of pointers to uncompressed, |
| 778 | * null-terminated C strings. Each chunk has a keyword that describes the |
| 779 | * textual data contained in that chunk. Keywords are not required to be |
| 780 | * unique, and the text string may be empty. Any number of text chunks may |
| 781 | * be in an image. |
| 782 | */ |
| 783 | int num_text; /* number of comments read/to write */ |
| 784 | int max_text; /* current size of text array */ |
| 785 | png_textp text; /* array of comments read/to write */ |
| 786 | #endif /* PNG_TEXT_SUPPORTED */ |
| 787 | |
| 788 | #if defined(PNG_tIME_SUPPORTED) |
| 789 | /* The tIME chunk holds the last time the displayed image data was |
| 790 | * modified. See the png_time struct for the contents of this struct. |
| 791 | */ |
| 792 | png_time mod_time; |
| 793 | #endif |
| 794 | |
| 795 | #if defined(PNG_sBIT_SUPPORTED) |
| 796 | /* The sBIT chunk specifies the number of significant high-order bits |
| 797 | * in the pixel data. Values are in the range [1, bit_depth], and are |
| 798 | * only specified for the channels in the pixel data. The contents of |
| 799 | * the low-order bits is not specified. Data is valid if |
| 800 | * (valid & PNG_INFO_sBIT) is non-zero. |
| 801 | */ |
| 802 | png_color_8 sig_bit; /* significant bits in color channels */ |
| 803 | #endif |
| 804 | |
| 805 | #if defined(PNG_tRNS_SUPPORTED) || defined(PNG_READ_EXPAND_SUPPORTED) || \ |
| 806 | defined(PNG_READ_BACKGROUND_SUPPORTED) |
| 807 | /* The tRNS chunk supplies transparency data for paletted images and |
| 808 | * other image types that don't need a full alpha channel. There are |
| 809 | * "num_trans" transparency values for a paletted image, stored in the |
| 810 | * same order as the palette colors, starting from index 0. Values |
| 811 | * for the data are in the range [0, 255], ranging from fully transparent |
| 812 | * to fully opaque, respectively. For non-paletted images, there is a |
| 813 | * single color specified that should be treated as fully transparent. |
| 814 | * Data is valid if (valid & PNG_INFO_tRNS) is non-zero. |
| 815 | */ |
| 816 | png_bytep trans; /* transparent values for paletted image */ |
| 817 | png_color_16 trans_values; /* transparent color for non-palette image */ |
| 818 | #endif |
| 819 | |
| 820 | #if defined(PNG_bKGD_SUPPORTED) || defined(PNG_READ_BACKGROUND_SUPPORTED) |
| 821 | /* The bKGD chunk gives the suggested image background color if the |
| 822 | * display program does not have its own background color and the image |
| 823 | * is needs to composited onto a background before display. The colors |
| 824 | * in "background" are normally in the same color space/depth as the |
| 825 | * pixel data. Data is valid if (valid & PNG_INFO_bKGD) is non-zero. |
| 826 | */ |
| 827 | png_color_16 background; |
| 828 | #endif |
| 829 | |
| 830 | #if defined(PNG_oFFs_SUPPORTED) |
| 831 | /* The oFFs chunk gives the offset in "offset_unit_type" units rightwards |
| 832 | * and downwards from the top-left corner of the display, page, or other |
| 833 | * application-specific co-ordinate space. See the PNG_OFFSET_ defines |
| 834 | * below for the unit types. Valid if (valid & PNG_INFO_oFFs) non-zero. |
| 835 | */ |
| 836 | png_int_32 x_offset; /* x offset on page */ |
| 837 | png_int_32 y_offset; /* y offset on page */ |
| 838 | png_byte offset_unit_type; /* offset units type */ |
| 839 | #endif |
| 840 | |
| 841 | #if defined(PNG_pHYs_SUPPORTED) |
| 842 | /* The pHYs chunk gives the physical pixel density of the image for |
| 843 | * display or printing in "phys_unit_type" units (see PNG_RESOLUTION_ |
| 844 | * defines below). Data is valid if (valid & PNG_INFO_pHYs) is non-zero. |
| 845 | */ |
| 846 | png_uint_32 x_pixels_per_unit; /* horizontal pixel density */ |
| 847 | png_uint_32 y_pixels_per_unit; /* vertical pixel density */ |
| 848 | png_byte phys_unit_type; /* resolution type (see PNG_RESOLUTION_ below) */ |
| 849 | #endif |
| 850 | |
| 851 | #if defined(PNG_hIST_SUPPORTED) |
| 852 | /* The hIST chunk contains the relative frequency or importance of the |
| 853 | * various palette entries, so that a viewer can intelligently select a |
| 854 | * reduced-color palette, if required. Data is an array of "num_palette" |
| 855 | * values in the range [0,65535]. Data valid if (valid & PNG_INFO_hIST) |
| 856 | * is non-zero. |
| 857 | */ |
| 858 | png_uint_16p hist; |
| 859 | #endif |
| 860 | |
| 861 | #ifdef PNG_cHRM_SUPPORTED |
| 862 | /* The cHRM chunk describes the CIE color characteristics of the monitor |
| 863 | * on which the PNG was created. This data allows the viewer to do gamut |
| 864 | * mapping of the input image to ensure that the viewer sees the same |
| 865 | * colors in the image as the creator. Values are in the range |
| 866 | * [0.0, 0.8]. Data valid if (valid & PNG_INFO_cHRM) non-zero. |
| 867 | */ |
| 868 | #ifdef PNG_FLOATING_POINT_SUPPORTED |
| 869 | float x_white; |
| 870 | float y_white; |
| 871 | float x_red; |
| 872 | float y_red; |
| 873 | float x_green; |
| 874 | float y_green; |
| 875 | float x_blue; |
| 876 | float y_blue; |
| 877 | #endif |
| 878 | #endif |
| 879 | |
| 880 | #if defined(PNG_pCAL_SUPPORTED) |
| 881 | /* The pCAL chunk describes a transformation between the stored pixel |
| 882 | * values and original physical data values used to create the image. |
| 883 | * The integer range [0, 2^bit_depth - 1] maps to the floating-point |
| 884 | * range given by [pcal_X0, pcal_X1], and are further transformed by a |
| 885 | * (possibly non-linear) transformation function given by "pcal_type" |
| 886 | * and "pcal_params" into "pcal_units". Please see the PNG_EQUATION_ |
| 887 | * defines below, and the PNG-Group's PNG extensions document for a |
| 888 | * complete description of the transformations and how they should be |
| 889 | * implemented, and for a description of the ASCII parameter strings. |
| 890 | * Data values are valid if (valid & PNG_INFO_pCAL) non-zero. |
| 891 | */ |
| 892 | png_charp pcal_purpose; /* pCAL chunk description string */ |
| 893 | png_int_32 pcal_X0; /* minimum value */ |
| 894 | png_int_32 pcal_X1; /* maximum value */ |
| 895 | png_charp pcal_units; /* Latin-1 string giving physical units */ |
| 896 | png_charpp pcal_params; /* ASCII strings containing parameter values */ |
| 897 | png_byte pcal_type; /* equation type (see PNG_EQUATION_ below) */ |
| 898 | png_byte pcal_nparams; /* number of parameters given in pcal_params */ |
| 899 | #endif |
| 900 | |
| 901 | /* New members added in libpng-1.0.6 */ |
| 902 | #ifdef PNG_FREE_ME_SUPPORTED |
| 903 | png_uint_32 free_me; /* flags items libpng is responsible for freeing */ |
| 904 | #endif |
| 905 | |
| 906 | #if defined(PNG_UNKNOWN_CHUNKS_SUPPORTED) |
| 907 | /* storage for unknown chunks that the library doesn't recognize. */ |
| 908 | png_unknown_chunkp unknown_chunks; |
| 909 | png_size_t unknown_chunks_num; |
| 910 | #endif |
| 911 | |
| 912 | #if defined(PNG_iCCP_SUPPORTED) |
| 913 | /* iCCP chunk data. */ |
| 914 | png_charp iccp_name; /* profile name */ |
| 915 | png_charp iccp_profile; /* International Color Consortium profile data */ |
| 916 | /* Note to maintainer: should be png_bytep */ |
| 917 | png_uint_32 iccp_proflen; /* ICC profile data length */ |
| 918 | png_byte iccp_compression; /* Always zero */ |
| 919 | #endif |
| 920 | |
| 921 | #if defined(PNG_sPLT_SUPPORTED) |
| 922 | /* data on sPLT chunks (there may be more than one). */ |
| 923 | png_sPLT_tp splt_palettes; |
| 924 | png_uint_32 splt_palettes_num; |
| 925 | #endif |
| 926 | |
| 927 | #if defined(PNG_sCAL_SUPPORTED) |
| 928 | /* The sCAL chunk describes the actual physical dimensions of the |
| 929 | * subject matter of the graphic. The chunk contains a unit specification |
| 930 | * a byte value, and two ASCII strings representing floating-point |
| 931 | * values. The values are width and height corresponsing to one pixel |
| 932 | * in the image. This external representation is converted to double |
| 933 | * here. Data values are valid if (valid & PNG_INFO_sCAL) is non-zero. |
| 934 | */ |
| 935 | png_byte scal_unit; /* unit of physical scale */ |
| 936 | #ifdef PNG_FLOATING_POINT_SUPPORTED |
| 937 | double scal_pixel_width; /* width of one pixel */ |
| 938 | double scal_pixel_height; /* height of one pixel */ |
| 939 | #endif |
| 940 | #ifdef PNG_FIXED_POINT_SUPPORTED |
| 941 | png_charp scal_s_width; /* string containing height */ |
| 942 | png_charp scal_s_height; /* string containing width */ |
| 943 | #endif |
| 944 | #endif |
| 945 | |
| 946 | #if defined(PNG_INFO_IMAGE_SUPPORTED) |
| 947 | /* Memory has been allocated if (valid & PNG_ALLOCATED_INFO_ROWS) non-zero */ |
| 948 | /* Data valid if (valid & PNG_INFO_IDAT) non-zero */ |
| 949 | png_bytepp row_pointers; /* the image bits */ |
| 950 | #endif |
| 951 | |
| 952 | #if defined(PNG_FIXED_POINT_SUPPORTED) && defined(PNG_gAMA_SUPPORTED) |
| 953 | png_fixed_point int_gamma; /* gamma of image, if (valid & PNG_INFO_gAMA) */ |
| 954 | #endif |
| 955 | |
| 956 | #if defined(PNG_cHRM_SUPPORTED) && defined(PNG_FIXED_POINT_SUPPORTED) |
| 957 | png_fixed_point int_x_white; |
| 958 | png_fixed_point int_y_white; |
| 959 | png_fixed_point int_x_red; |
| 960 | png_fixed_point int_y_red; |
| 961 | png_fixed_point int_x_green; |
| 962 | png_fixed_point int_y_green; |
| 963 | png_fixed_point int_x_blue; |
| 964 | png_fixed_point int_y_blue; |
| 965 | #endif |
| 966 | |
| 967 | } png_info; |
| 968 | |
| 969 | typedef png_info FAR * png_infop; |
| 970 | typedef png_info FAR * FAR * png_infopp; |
| 971 | |
| 972 | /* Maximum positive integer used in PNG is (2^31)-1 */ |
| 973 | #define PNG_UINT_31_MAX ((png_uint_32)0x7fffffffL) |
| 974 | #define PNG_UINT_32_MAX ((png_uint_32)(-1)) |
| 975 | #define PNG_SIZE_MAX ((png_size_t)(-1)) |
| 976 | #if defined(PNG_1_0_X) || defined (PNG_1_2_X) |
| 977 | /* PNG_MAX_UINT is deprecated; use PNG_UINT_31_MAX instead. */ |
| 978 | #define PNG_MAX_UINT PNG_UINT_31_MAX |
| 979 | #endif |
| 980 | |
| 981 | /* These describe the color_type field in png_info. */ |
| 982 | /* color type masks */ |
| 983 | #define PNG_COLOR_MASK_PALETTE 1 |
| 984 | #define PNG_COLOR_MASK_COLOR 2 |
| 985 | #define PNG_COLOR_MASK_ALPHA 4 |
| 986 | |
| 987 | /* color types. Note that not all combinations are legal */ |
| 988 | #define PNG_COLOR_TYPE_GRAY 0 |
| 989 | #define PNG_COLOR_TYPE_PALETTE (PNG_COLOR_MASK_COLOR | PNG_COLOR_MASK_PALETTE) |
| 990 | #define PNG_COLOR_TYPE_RGB (PNG_COLOR_MASK_COLOR) |
| 991 | #define PNG_COLOR_TYPE_RGB_ALPHA (PNG_COLOR_MASK_COLOR | PNG_COLOR_MASK_ALPHA) |
| 992 | #define PNG_COLOR_TYPE_GRAY_ALPHA (PNG_COLOR_MASK_ALPHA) |
| 993 | /* aliases */ |
| 994 | #define PNG_COLOR_TYPE_RGBA PNG_COLOR_TYPE_RGB_ALPHA |
| 995 | #define PNG_COLOR_TYPE_GA PNG_COLOR_TYPE_GRAY_ALPHA |
| 996 | |
| 997 | /* This is for compression type. PNG 1.0-1.2 only define the single type. */ |
| 998 | #define PNG_COMPRESSION_TYPE_BASE 0 /* Deflate method 8, 32K window */ |
| 999 | #define PNG_COMPRESSION_TYPE_DEFAULT PNG_COMPRESSION_TYPE_BASE |
| 1000 | |
| 1001 | /* This is for filter type. PNG 1.0-1.2 only define the single type. */ |
| 1002 | #define PNG_FILTER_TYPE_BASE 0 /* Single row per-byte filtering */ |
| 1003 | #define PNG_INTRAPIXEL_DIFFERENCING 64 /* Used only in MNG datastreams */ |
| 1004 | #define PNG_FILTER_TYPE_DEFAULT PNG_FILTER_TYPE_BASE |
| 1005 | |
| 1006 | /* These are for the interlacing type. These values should NOT be changed. */ |
| 1007 | #define PNG_INTERLACE_NONE 0 /* Non-interlaced image */ |
| 1008 | #define PNG_INTERLACE_ADAM7 1 /* Adam7 interlacing */ |
| 1009 | #define PNG_INTERLACE_LAST 2 /* Not a valid value */ |
| 1010 | |
| 1011 | /* These are for the oFFs chunk. These values should NOT be changed. */ |
| 1012 | #define PNG_OFFSET_PIXEL 0 /* Offset in pixels */ |
| 1013 | #define PNG_OFFSET_MICROMETER 1 /* Offset in micrometers (1/10^6 meter) */ |
| 1014 | #define PNG_OFFSET_LAST 2 /* Not a valid value */ |
| 1015 | |
| 1016 | /* These are for the pCAL chunk. These values should NOT be changed. */ |
| 1017 | #define PNG_EQUATION_LINEAR 0 /* Linear transformation */ |
| 1018 | #define PNG_EQUATION_BASE_E 1 /* Exponential base e transform */ |
| 1019 | #define PNG_EQUATION_ARBITRARY 2 /* Arbitrary base exponential transform */ |
| 1020 | #define PNG_EQUATION_HYPERBOLIC 3 /* Hyperbolic sine transformation */ |
| 1021 | #define PNG_EQUATION_LAST 4 /* Not a valid value */ |
| 1022 | |
| 1023 | /* These are for the sCAL chunk. These values should NOT be changed. */ |
| 1024 | #define PNG_SCALE_UNKNOWN 0 /* unknown unit (image scale) */ |
| 1025 | #define PNG_SCALE_METER 1 /* meters per pixel */ |
| 1026 | #define PNG_SCALE_RADIAN 2 /* radians per pixel */ |
| 1027 | #define PNG_SCALE_LAST 3 /* Not a valid value */ |
| 1028 | |
| 1029 | /* These are for the pHYs chunk. These values should NOT be changed. */ |
| 1030 | #define PNG_RESOLUTION_UNKNOWN 0 /* pixels/unknown unit (aspect ratio) */ |
| 1031 | #define PNG_RESOLUTION_METER 1 /* pixels/meter */ |
| 1032 | #define PNG_RESOLUTION_LAST 2 /* Not a valid value */ |
| 1033 | |
| 1034 | /* These are for the sRGB chunk. These values should NOT be changed. */ |
| 1035 | #define PNG_sRGB_INTENT_PERCEPTUAL 0 |
| 1036 | #define PNG_sRGB_INTENT_RELATIVE 1 |
| 1037 | #define PNG_sRGB_INTENT_SATURATION 2 |
| 1038 | #define PNG_sRGB_INTENT_ABSOLUTE 3 |
| 1039 | #define PNG_sRGB_INTENT_LAST 4 /* Not a valid value */ |
| 1040 | |
| 1041 | /* This is for text chunks */ |
| 1042 | #define PNG_KEYWORD_MAX_LENGTH 79 |
| 1043 | |
| 1044 | /* Maximum number of entries in PLTE/sPLT/tRNS arrays */ |
| 1045 | #define PNG_MAX_PALETTE_LENGTH 256 |
| 1046 | |
| 1047 | /* These determine if an ancillary chunk's data has been successfully read |
| 1048 | * from the PNG header, or if the application has filled in the corresponding |
| 1049 | * data in the info_struct to be written into the output file. The values |
| 1050 | * of the PNG_INFO_<chunk> defines should NOT be changed. |
| 1051 | */ |
| 1052 | #define PNG_INFO_gAMA 0x0001 |
| 1053 | #define PNG_INFO_sBIT 0x0002 |
| 1054 | #define PNG_INFO_cHRM 0x0004 |
| 1055 | #define PNG_INFO_PLTE 0x0008 |
| 1056 | #define PNG_INFO_tRNS 0x0010 |
| 1057 | #define PNG_INFO_bKGD 0x0020 |
| 1058 | #define PNG_INFO_hIST 0x0040 |
| 1059 | #define PNG_INFO_pHYs 0x0080 |
| 1060 | #define PNG_INFO_oFFs 0x0100 |
| 1061 | #define PNG_INFO_tIME 0x0200 |
| 1062 | #define PNG_INFO_pCAL 0x0400 |
| 1063 | #define PNG_INFO_sRGB 0x0800 /* GR-P, 0.96a */ |
| 1064 | #define PNG_INFO_iCCP 0x1000 /* ESR, 1.0.6 */ |
| 1065 | #define PNG_INFO_sPLT 0x2000 /* ESR, 1.0.6 */ |
| 1066 | #define PNG_INFO_sCAL 0x4000 /* ESR, 1.0.6 */ |
| 1067 | #define PNG_INFO_IDAT 0x8000L /* ESR, 1.0.6 */ |
| 1068 | |
| 1069 | /* This is used for the transformation routines, as some of them |
| 1070 | * change these values for the row. It also should enable using |
| 1071 | * the routines for other purposes. |
| 1072 | */ |
| 1073 | typedef struct png_row_info_struct |
| 1074 | { |
| 1075 | png_uint_32 width; /* width of row */ |
| 1076 | png_uint_32 rowbytes; /* number of bytes in row */ |
| 1077 | png_byte color_type; /* color type of row */ |
| 1078 | png_byte bit_depth; /* bit depth of row */ |
| 1079 | png_byte channels; /* number of channels (1, 2, 3, or 4) */ |
| 1080 | png_byte pixel_depth; /* bits per pixel (depth * channels) */ |
| 1081 | } png_row_info; |
| 1082 | |
| 1083 | typedef png_row_info FAR * png_row_infop; |
| 1084 | typedef png_row_info FAR * FAR * png_row_infopp; |
| 1085 | |
| 1086 | /* These are the function types for the I/O functions and for the functions |
| 1087 | * that allow the user to override the default I/O functions with his or her |
| 1088 | * own. The png_error_ptr type should match that of user-supplied warning |
| 1089 | * and error functions, while the png_rw_ptr type should match that of the |
| 1090 | * user read/write data functions. |
| 1091 | */ |
| 1092 | typedef struct png_struct_def png_struct; |
| 1093 | typedef png_struct FAR * png_structp; |
| 1094 | |
| 1095 | typedef void (PNGAPI *png_error_ptr) PNGARG((png_structp, png_const_charp)); |
| 1096 | typedef void (PNGAPI *png_rw_ptr) PNGARG((png_structp, png_bytep, png_size_t)); |
| 1097 | typedef void (PNGAPI *png_flush_ptr) PNGARG((png_structp)); |
| 1098 | typedef void (PNGAPI *png_read_status_ptr) PNGARG((png_structp, png_uint_32, |
| 1099 | int)); |
| 1100 | typedef void (PNGAPI *png_write_status_ptr) PNGARG((png_structp, png_uint_32, |
| 1101 | int)); |
| 1102 | |
| 1103 | #ifdef PNG_PROGRESSIVE_READ_SUPPORTED |
| 1104 | typedef void (PNGAPI *png_progressive_info_ptr) PNGARG((png_structp, png_infop)); |
| 1105 | typedef void (PNGAPI *png_progressive_end_ptr) PNGARG((png_structp, png_infop)); |
| 1106 | typedef void (PNGAPI *png_progressive_row_ptr) PNGARG((png_structp, png_bytep, |
| 1107 | png_uint_32, int)); |
| 1108 | #endif |
| 1109 | |
| 1110 | #if defined(PNG_READ_USER_TRANSFORM_SUPPORTED) || \ |
| 1111 | defined(PNG_WRITE_USER_TRANSFORM_SUPPORTED) || \ |
| 1112 | defined(PNG_LEGACY_SUPPORTED) |
| 1113 | typedef void (PNGAPI *png_user_transform_ptr) PNGARG((png_structp, |
| 1114 | png_row_infop, png_bytep)); |
| 1115 | #endif |
| 1116 | |
| 1117 | #if defined(PNG_USER_CHUNKS_SUPPORTED) |
| 1118 | typedef int (PNGAPI *png_user_chunk_ptr) PNGARG((png_structp, png_unknown_chunkp)); |
| 1119 | #endif |
| 1120 | #if defined(PNG_UNKNOWN_CHUNKS_SUPPORTED) |
| 1121 | typedef void (PNGAPI *png_unknown_chunk_ptr) PNGARG((png_structp)); |
| 1122 | #endif |
| 1123 | |
| 1124 | /* Transform masks for the high-level interface */ |
| 1125 | #define PNG_TRANSFORM_IDENTITY 0x0000 /* read and write */ |
| 1126 | #define PNG_TRANSFORM_STRIP_16 0x0001 /* read only */ |
| 1127 | #define PNG_TRANSFORM_STRIP_ALPHA 0x0002 /* read only */ |
| 1128 | #define PNG_TRANSFORM_PACKING 0x0004 /* read and write */ |
| 1129 | #define PNG_TRANSFORM_PACKSWAP 0x0008 /* read and write */ |
| 1130 | #define PNG_TRANSFORM_EXPAND 0x0010 /* read only */ |
| 1131 | #define PNG_TRANSFORM_INVERT_MONO 0x0020 /* read and write */ |
| 1132 | #define PNG_TRANSFORM_SHIFT 0x0040 /* read and write */ |
| 1133 | #define PNG_TRANSFORM_BGR 0x0080 /* read and write */ |
| 1134 | #define PNG_TRANSFORM_SWAP_ALPHA 0x0100 /* read and write */ |
| 1135 | #define PNG_TRANSFORM_SWAP_ENDIAN 0x0200 /* read and write */ |
| 1136 | #define PNG_TRANSFORM_INVERT_ALPHA 0x0400 /* read and write */ |
| 1137 | #define PNG_TRANSFORM_STRIP_FILLER 0x0800 /* WRITE only */ |
| 1138 | |
| 1139 | /* Flags for MNG supported features */ |
| 1140 | #define PNG_FLAG_MNG_EMPTY_PLTE 0x01 |
| 1141 | #define PNG_FLAG_MNG_FILTER_64 0x04 |
| 1142 | #define PNG_ALL_MNG_FEATURES 0x05 |
| 1143 | |
| 1144 | typedef png_voidp (*png_malloc_ptr) PNGARG((png_structp, png_size_t)); |
| 1145 | typedef void (*png_free_ptr) PNGARG((png_structp, png_voidp)); |
| 1146 | |
| 1147 | /* The structure that holds the information to read and write PNG files. |
| 1148 | * The only people who need to care about what is inside of this are the |
| 1149 | * people who will be modifying the library for their own special needs. |
| 1150 | * It should NOT be accessed directly by an application, except to store |
| 1151 | * the jmp_buf. |
| 1152 | */ |
| 1153 | |
| 1154 | struct png_struct_def |
| 1155 | { |
| 1156 | #ifdef PNG_SETJMP_SUPPORTED |
| 1157 | jmp_buf jmpbuf; /* used in png_error */ |
| 1158 | #endif |
| 1159 | png_error_ptr error_fn; /* function for printing errors and aborting */ |
| 1160 | png_error_ptr warning_fn; /* function for printing warnings */ |
| 1161 | png_voidp error_ptr; /* user supplied struct for error functions */ |
| 1162 | png_rw_ptr write_data_fn; /* function for writing output data */ |
| 1163 | png_rw_ptr read_data_fn; /* function for reading input data */ |
| 1164 | png_voidp io_ptr; /* ptr to application struct for I/O functions */ |
| 1165 | |
| 1166 | #if defined(PNG_READ_USER_TRANSFORM_SUPPORTED) |
| 1167 | png_user_transform_ptr read_user_transform_fn; /* user read transform */ |
| 1168 | #endif |
| 1169 | |
| 1170 | #if defined(PNG_WRITE_USER_TRANSFORM_SUPPORTED) |
| 1171 | png_user_transform_ptr write_user_transform_fn; /* user write transform */ |
| 1172 | #endif |
| 1173 | |
| 1174 | /* These were added in libpng-1.0.2 */ |
| 1175 | #if defined(PNG_USER_TRANSFORM_PTR_SUPPORTED) |
| 1176 | #if defined(PNG_READ_USER_TRANSFORM_SUPPORTED) || \ |
| 1177 | defined(PNG_WRITE_USER_TRANSFORM_SUPPORTED) |
| 1178 | png_voidp user_transform_ptr; /* user supplied struct for user transform */ |
| 1179 | png_byte user_transform_depth; /* bit depth of user transformed pixels */ |
| 1180 | png_byte user_transform_channels; /* channels in user transformed pixels */ |
| 1181 | #endif |
| 1182 | #endif |
| 1183 | |
| 1184 | png_uint_32 mode; /* tells us where we are in the PNG file */ |
| 1185 | png_uint_32 flags; /* flags indicating various things to libpng */ |
| 1186 | png_uint_32 transformations; /* which transformations to perform */ |
| 1187 | |
| 1188 | z_stream zstream; /* pointer to decompression structure (below) */ |
| 1189 | png_bytep zbuf; /* buffer for zlib */ |
| 1190 | png_size_t zbuf_size; /* size of zbuf */ |
| 1191 | int zlib_level; /* holds zlib compression level */ |
| 1192 | int zlib_method; /* holds zlib compression method */ |
| 1193 | int zlib_window_bits; /* holds zlib compression window bits */ |
| 1194 | int zlib_mem_level; /* holds zlib compression memory level */ |
| 1195 | int zlib_strategy; /* holds zlib compression strategy */ |
| 1196 | |
| 1197 | png_uint_32 width; /* width of image in pixels */ |
| 1198 | png_uint_32 height; /* height of image in pixels */ |
| 1199 | png_uint_32 num_rows; /* number of rows in current pass */ |
| 1200 | png_uint_32 usr_width; /* width of row at start of write */ |
| 1201 | png_uint_32 rowbytes; /* size of row in bytes */ |
| 1202 | png_uint_32 irowbytes; /* size of current interlaced row in bytes */ |
| 1203 | png_uint_32 iwidth; /* width of current interlaced row in pixels */ |
| 1204 | png_uint_32 row_number; /* current row in interlace pass */ |
| 1205 | png_bytep prev_row; /* buffer to save previous (unfiltered) row */ |
| 1206 | png_bytep row_buf; /* buffer to save current (unfiltered) row */ |
| 1207 | #ifndef PNG_NO_WRITE_FILTERING |
| 1208 | png_bytep sub_row; /* buffer to save "sub" row when filtering */ |
| 1209 | png_bytep up_row; /* buffer to save "up" row when filtering */ |
| 1210 | png_bytep avg_row; /* buffer to save "avg" row when filtering */ |
| 1211 | png_bytep paeth_row; /* buffer to save "Paeth" row when filtering */ |
| 1212 | #endif |
| 1213 | png_row_info row_info; /* used for transformation routines */ |
| 1214 | |
| 1215 | png_uint_32 idat_size; /* current IDAT size for read */ |
| 1216 | png_uint_32 crc; /* current chunk CRC value */ |
| 1217 | png_colorp palette; /* palette from the input file */ |
| 1218 | png_uint_16 num_palette; /* number of color entries in palette */ |
| 1219 | png_uint_16 num_trans; /* number of transparency values */ |
| 1220 | png_byte chunk_name[5]; /* null-terminated name of current chunk */ |
| 1221 | png_byte compression; /* file compression type (always 0) */ |
| 1222 | png_byte filter; /* file filter type (always 0) */ |
| 1223 | png_byte interlaced; /* PNG_INTERLACE_NONE, PNG_INTERLACE_ADAM7 */ |
| 1224 | png_byte pass; /* current interlace pass (0 - 6) */ |
| 1225 | png_byte do_filter; /* row filter flags (see PNG_FILTER_ below ) */ |
| 1226 | png_byte color_type; /* color type of file */ |
| 1227 | png_byte bit_depth; /* bit depth of file */ |
| 1228 | png_byte usr_bit_depth; /* bit depth of users row */ |
| 1229 | png_byte pixel_depth; /* number of bits per pixel */ |
| 1230 | png_byte channels; /* number of channels in file */ |
| 1231 | png_byte usr_channels; /* channels at start of write */ |
| 1232 | png_byte sig_bytes; /* magic bytes read/written from start of file */ |
| 1233 | |
| 1234 | #if defined(PNG_READ_FILLER_SUPPORTED) || defined(PNG_WRITE_FILLER_SUPPORTED) |
| 1235 | #ifdef PNG_LEGACY_SUPPORTED |
| 1236 | png_byte filler; /* filler byte for pixel expansion */ |
| 1237 | #else |
| 1238 | png_uint_16 filler; /* filler bytes for pixel expansion */ |
| 1239 | #endif |
| 1240 | #endif |
| 1241 | |
| 1242 | #if defined(PNG_bKGD_SUPPORTED) |
| 1243 | png_byte background_gamma_type; |
| 1244 | # ifdef PNG_FLOATING_POINT_SUPPORTED |
| 1245 | float background_gamma; |
| 1246 | # endif |
| 1247 | png_color_16 background; /* background color in screen gamma space */ |
| 1248 | #if defined(PNG_READ_GAMMA_SUPPORTED) |
| 1249 | png_color_16 background_1; /* background normalized to gamma 1.0 */ |
| 1250 | #endif |
| 1251 | #endif /* PNG_bKGD_SUPPORTED */ |
| 1252 | |
| 1253 | #if defined(PNG_WRITE_FLUSH_SUPPORTED) |
| 1254 | png_flush_ptr output_flush_fn;/* Function for flushing output */ |
| 1255 | png_uint_32 flush_dist; /* how many rows apart to flush, 0 - no flush */ |
| 1256 | png_uint_32 flush_rows; /* number of rows written since last flush */ |
| 1257 | #endif |
| 1258 | |
| 1259 | #if defined(PNG_READ_GAMMA_SUPPORTED) || defined(PNG_READ_BACKGROUND_SUPPORTED) |
| 1260 | int gamma_shift; /* number of "insignificant" bits 16-bit gamma */ |
| 1261 | #ifdef PNG_FLOATING_POINT_SUPPORTED |
| 1262 | float gamma; /* file gamma value */ |
| 1263 | float screen_gamma; /* screen gamma value (display_exponent) */ |
| 1264 | #endif |
| 1265 | #endif |
| 1266 | |
| 1267 | #if defined(PNG_READ_GAMMA_SUPPORTED) || defined(PNG_READ_BACKGROUND_SUPPORTED) |
| 1268 | png_bytep gamma_table; /* gamma table for 8-bit depth files */ |
| 1269 | png_bytep gamma_from_1; /* converts from 1.0 to screen */ |
| 1270 | png_bytep gamma_to_1; /* converts from file to 1.0 */ |
| 1271 | png_uint_16pp gamma_16_table; /* gamma table for 16-bit depth files */ |
| 1272 | png_uint_16pp gamma_16_from_1; /* converts from 1.0 to screen */ |
| 1273 | png_uint_16pp gamma_16_to_1; /* converts from file to 1.0 */ |
| 1274 | #endif |
| 1275 | |
| 1276 | #if defined(PNG_READ_GAMMA_SUPPORTED) || defined(PNG_sBIT_SUPPORTED) |
| 1277 | png_color_8 sig_bit; /* significant bits in each available channel */ |
| 1278 | #endif |
| 1279 | |
| 1280 | #if defined(PNG_READ_SHIFT_SUPPORTED) || defined(PNG_WRITE_SHIFT_SUPPORTED) |
| 1281 | png_color_8 shift; /* shift for significant bit tranformation */ |
| 1282 | #endif |
| 1283 | |
| 1284 | #if defined(PNG_tRNS_SUPPORTED) || defined(PNG_READ_BACKGROUND_SUPPORTED) \ |
| 1285 | || defined(PNG_READ_EXPAND_SUPPORTED) || defined(PNG_READ_BACKGROUND_SUPPORTED) |
| 1286 | png_bytep trans; /* transparency values for paletted files */ |
| 1287 | png_color_16 trans_values; /* transparency values for non-paletted files */ |
| 1288 | #endif |
| 1289 | |
| 1290 | png_read_status_ptr read_row_fn; /* called after each row is decoded */ |
| 1291 | png_write_status_ptr write_row_fn; /* called after each row is encoded */ |
| 1292 | #ifdef PNG_PROGRESSIVE_READ_SUPPORTED |
| 1293 | png_progressive_info_ptr info_fn; /* called after header data fully read */ |
| 1294 | png_progressive_row_ptr row_fn; /* called after each prog. row is decoded */ |
| 1295 | png_progressive_end_ptr end_fn; /* called after image is complete */ |
| 1296 | png_bytep save_buffer_ptr; /* current location in save_buffer */ |
| 1297 | png_bytep save_buffer; /* buffer for previously read data */ |
| 1298 | png_bytep current_buffer_ptr; /* current location in current_buffer */ |
| 1299 | png_bytep current_buffer; /* buffer for recently used data */ |
| 1300 | png_uint_32 push_length; /* size of current input chunk */ |
| 1301 | png_uint_32 skip_length; /* bytes to skip in input data */ |
| 1302 | png_size_t save_buffer_size; /* amount of data now in save_buffer */ |
| 1303 | png_size_t save_buffer_max; /* total size of save_buffer */ |
| 1304 | png_size_t buffer_size; /* total amount of available input data */ |
| 1305 | png_size_t current_buffer_size; /* amount of data now in current_buffer */ |
| 1306 | int process_mode; /* what push library is currently doing */ |
| 1307 | int cur_palette; /* current push library palette index */ |
| 1308 | |
| 1309 | # if defined(PNG_TEXT_SUPPORTED) |
| 1310 | png_size_t current_text_size; /* current size of text input data */ |
| 1311 | png_size_t current_text_left; /* how much text left to read in input */ |
| 1312 | png_charp current_text; /* current text chunk buffer */ |
| 1313 | png_charp current_text_ptr; /* current location in current_text */ |
| 1314 | # endif /* PNG_TEXT_SUPPORTED */ |
| 1315 | #endif /* PNG_PROGRESSIVE_READ_SUPPORTED */ |
| 1316 | |
| 1317 | #if defined(__TURBOC__) && !defined(_Windows) && !defined(__FLAT__) |
| 1318 | /* for the Borland special 64K segment handler */ |
| 1319 | png_bytepp offset_table_ptr; |
| 1320 | png_bytep offset_table; |
| 1321 | png_uint_16 offset_table_number; |
| 1322 | png_uint_16 offset_table_count; |
| 1323 | png_uint_16 offset_table_count_free; |
| 1324 | #endif |
| 1325 | |
| 1326 | #if defined(PNG_READ_DITHER_SUPPORTED) |
| 1327 | png_bytep palette_lookup; /* lookup table for dithering */ |
| 1328 | png_bytep dither_index; /* index translation for palette files */ |
| 1329 | #endif |
| 1330 | |
| 1331 | #if defined(PNG_READ_DITHER_SUPPORTED) || defined(PNG_hIST_SUPPORTED) |
| 1332 | png_uint_16p hist; /* histogram */ |
| 1333 | #endif |
| 1334 | |
| 1335 | #if defined(PNG_WRITE_WEIGHTED_FILTER_SUPPORTED) |
| 1336 | png_byte heuristic_method; /* heuristic for row filter selection */ |
| 1337 | png_byte num_prev_filters; /* number of weights for previous rows */ |
| 1338 | png_bytep prev_filters; /* filter type(s) of previous row(s) */ |
| 1339 | png_uint_16p filter_weights; /* weight(s) for previous line(s) */ |
| 1340 | png_uint_16p inv_filter_weights; /* 1/weight(s) for previous line(s) */ |
| 1341 | png_uint_16p filter_costs; /* relative filter calculation cost */ |
| 1342 | png_uint_16p inv_filter_costs; /* 1/relative filter calculation cost */ |
| 1343 | #endif |
| 1344 | |
| 1345 | #if defined(PNG_TIME_RFC1123_SUPPORTED) |
| 1346 | png_charp time_buffer; /* String to hold RFC 1123 time text */ |
| 1347 | #endif |
| 1348 | |
| 1349 | /* New members added in libpng-1.0.6 */ |
| 1350 | |
| 1351 | #ifdef PNG_FREE_ME_SUPPORTED |
| 1352 | png_uint_32 free_me; /* flags items libpng is responsible for freeing */ |
| 1353 | #endif |
| 1354 | |
| 1355 | #if defined(PNG_USER_CHUNKS_SUPPORTED) |
| 1356 | png_voidp user_chunk_ptr; |
| 1357 | png_user_chunk_ptr read_user_chunk_fn; /* user read chunk handler */ |
| 1358 | #endif |
| 1359 | |
| 1360 | #if defined(PNG_UNKNOWN_CHUNKS_SUPPORTED) |
| 1361 | int num_chunk_list; |
| 1362 | png_bytep chunk_list; |
| 1363 | #endif |
| 1364 | |
| 1365 | /* New members added in libpng-1.0.3 */ |
| 1366 | #if defined(PNG_READ_RGB_TO_GRAY_SUPPORTED) |
| 1367 | png_byte rgb_to_gray_status; |
| 1368 | /* These were changed from png_byte in libpng-1.0.6 */ |
| 1369 | png_uint_16 rgb_to_gray_red_coeff; |
| 1370 | png_uint_16 rgb_to_gray_green_coeff; |
| 1371 | png_uint_16 rgb_to_gray_blue_coeff; |
| 1372 | #endif |
| 1373 | |
| 1374 | /* New member added in libpng-1.0.4 (renamed in 1.0.9) */ |
| 1375 | #if defined(PNG_MNG_FEATURES_SUPPORTED) || \ |
| 1376 | defined(PNG_READ_EMPTY_PLTE_SUPPORTED) || \ |
| 1377 | defined(PNG_WRITE_EMPTY_PLTE_SUPPORTED) |
| 1378 | /* changed from png_byte to png_uint_32 at version 1.2.0 */ |
| 1379 | #ifdef PNG_1_0_X |
| 1380 | png_byte mng_features_permitted; |
| 1381 | #else |
| 1382 | png_uint_32 mng_features_permitted; |
| 1383 | #endif /* PNG_1_0_X */ |
| 1384 | #endif |
| 1385 | |
| 1386 | /* New member added in libpng-1.0.7 */ |
| 1387 | #if defined(PNG_READ_GAMMA_SUPPORTED) || defined(PNG_READ_BACKGROUND_SUPPORTED) |
| 1388 | png_fixed_point int_gamma; |
| 1389 | #endif |
| 1390 | |
| 1391 | /* New member added in libpng-1.0.9, ifdef'ed out in 1.0.12, enabled in 1.2.0 */ |
| 1392 | #if defined(PNG_MNG_FEATURES_SUPPORTED) |
| 1393 | png_byte filter_type; |
| 1394 | #endif |
| 1395 | |
| 1396 | #if defined(PNG_1_0_X) |
| 1397 | /* New member added in libpng-1.0.10, ifdef'ed out in 1.2.0 */ |
| 1398 | png_uint_32 row_buf_size; |
| 1399 | #endif |
| 1400 | |
| 1401 | /* New members added in libpng-1.2.0 */ |
| 1402 | #if defined(PNG_ASSEMBLER_CODE_SUPPORTED) |
| 1403 | # if !defined(PNG_1_0_X) |
| 1404 | # if defined(PNG_MMX_CODE_SUPPORTED) |
| 1405 | png_byte mmx_bitdepth_threshold; |
| 1406 | png_uint_32 mmx_rowbytes_threshold; |
| 1407 | # endif |
| 1408 | png_uint_32 asm_flags; |
| 1409 | # endif |
| 1410 | #endif |
| 1411 | |
| 1412 | /* New members added in libpng-1.0.2 but first enabled by default in 1.2.0 */ |
| 1413 | #ifdef PNG_USER_MEM_SUPPORTED |
| 1414 | png_voidp mem_ptr; /* user supplied struct for mem functions */ |
| 1415 | png_malloc_ptr malloc_fn; /* function for allocating memory */ |
| 1416 | png_free_ptr free_fn; /* function for freeing memory */ |
| 1417 | #endif |
| 1418 | |
| 1419 | /* New member added in libpng-1.0.13 and 1.2.0 */ |
| 1420 | png_bytep big_row_buf; /* buffer to save current (unfiltered) row */ |
| 1421 | |
| 1422 | #if defined(PNG_READ_DITHER_SUPPORTED) |
| 1423 | /* The following three members were added at version 1.0.14 and 1.2.4 */ |
| 1424 | png_bytep dither_sort; /* working sort array */ |
| 1425 | png_bytep index_to_palette; /* where the original index currently is */ |
| 1426 | /* in the palette */ |
| 1427 | png_bytep palette_to_index; /* which original index points to this */ |
| 1428 | /* palette color */ |
| 1429 | #endif |
| 1430 | |
| 1431 | /* New members added in libpng-1.0.16 and 1.2.6 */ |
| 1432 | png_byte compression_type; |
| 1433 | |
| 1434 | #ifdef PNG_SET_USER_LIMITS_SUPPORTED |
| 1435 | png_uint_32 user_width_max; |
| 1436 | png_uint_32 user_height_max; |
| 1437 | #endif |
| 1438 | |
| 1439 | /* New member added in libpng-1.0.25 and 1.2.17 */ |
| 1440 | #if defined(PNG_UNKNOWN_CHUNKS_SUPPORTED) |
| 1441 | /* storage for unknown chunk that the library doesn't recognize. */ |
| 1442 | png_unknown_chunk unknown_chunk; |
| 1443 | #endif |
| 1444 | |
| 1445 | /* New members added in libpng-1.2.26 */ |
| 1446 | png_uint_32 old_big_row_buf_size, old_prev_row_size; |
| 1447 | }; |
| 1448 | |
| 1449 | |
| 1450 | /* This triggers a compiler error in png.c, if png.c and png.h |
| 1451 | * do not agree upon the version number. |
| 1452 | */ |
| 1453 | typedef png_structp version_1_2_29; |
| 1454 | |
| 1455 | typedef png_struct FAR * FAR * png_structpp; |
| 1456 | |
| 1457 | /* Here are the function definitions most commonly used. This is not |
| 1458 | * the place to find out how to use libpng. See libpng.txt for the |
| 1459 | * full explanation, see example.c for the summary. This just provides |
| 1460 | * a simple one line description of the use of each function. |
| 1461 | */ |
| 1462 | |
| 1463 | /* Returns the version number of the library */ |
| 1464 | extern PNG_EXPORT(png_uint_32,png_access_version_number) PNGARG((void)); |
| 1465 | |
| 1466 | /* Tell lib we have already handled the first <num_bytes> magic bytes. |
| 1467 | * Handling more than 8 bytes from the beginning of the file is an error. |
| 1468 | */ |
| 1469 | extern PNG_EXPORT(void,png_set_sig_bytes) PNGARG((png_structp png_ptr, |
| 1470 | int num_bytes)); |
| 1471 | |
| 1472 | /* Check sig[start] through sig[start + num_to_check - 1] to see if it's a |
| 1473 | * PNG file. Returns zero if the supplied bytes match the 8-byte PNG |
| 1474 | * signature, and non-zero otherwise. Having num_to_check == 0 or |
| 1475 | * start > 7 will always fail (ie return non-zero). |
| 1476 | */ |
| 1477 | extern PNG_EXPORT(int,png_sig_cmp) PNGARG((png_bytep sig, png_size_t start, |
| 1478 | png_size_t num_to_check)); |
| 1479 | |
| 1480 | /* Simple signature checking function. This is the same as calling |
| 1481 | * png_check_sig(sig, n) := !png_sig_cmp(sig, 0, n). |
| 1482 | */ |
| 1483 | extern PNG_EXPORT(int,png_check_sig) PNGARG((png_bytep sig, int num)); |
| 1484 | |
| 1485 | /* Allocate and initialize png_ptr struct for reading, and any other memory. */ |
| 1486 | extern PNG_EXPORT(png_structp,png_create_read_struct) |
| 1487 | PNGARG((png_const_charp user_png_ver, png_voidp error_ptr, |
| 1488 | png_error_ptr error_fn, png_error_ptr warn_fn)); |
| 1489 | |
| 1490 | /* Allocate and initialize png_ptr struct for writing, and any other memory */ |
| 1491 | extern PNG_EXPORT(png_structp,png_create_write_struct) |
| 1492 | PNGARG((png_const_charp user_png_ver, png_voidp error_ptr, |
| 1493 | png_error_ptr error_fn, png_error_ptr warn_fn)); |
| 1494 | |
| 1495 | #ifdef PNG_WRITE_SUPPORTED |
| 1496 | extern PNG_EXPORT(png_uint_32,png_get_compression_buffer_size) |
| 1497 | PNGARG((png_structp png_ptr)); |
| 1498 | #endif |
| 1499 | |
| 1500 | #ifdef PNG_WRITE_SUPPORTED |
| 1501 | extern PNG_EXPORT(void,png_set_compression_buffer_size) |
| 1502 | PNGARG((png_structp png_ptr, png_uint_32 size)); |
| 1503 | #endif |
| 1504 | |
| 1505 | /* Reset the compression stream */ |
| 1506 | extern PNG_EXPORT(int,png_reset_zstream) PNGARG((png_structp png_ptr)); |
| 1507 | |
| 1508 | /* New functions added in libpng-1.0.2 (not enabled by default until 1.2.0) */ |
| 1509 | #ifdef PNG_USER_MEM_SUPPORTED |
| 1510 | extern PNG_EXPORT(png_structp,png_create_read_struct_2) |
| 1511 | PNGARG((png_const_charp user_png_ver, png_voidp error_ptr, |
| 1512 | png_error_ptr error_fn, png_error_ptr warn_fn, png_voidp mem_ptr, |
| 1513 | png_malloc_ptr malloc_fn, png_free_ptr free_fn)); |
| 1514 | extern PNG_EXPORT(png_structp,png_create_write_struct_2) |
| 1515 | PNGARG((png_const_charp user_png_ver, png_voidp error_ptr, |
| 1516 | png_error_ptr error_fn, png_error_ptr warn_fn, png_voidp mem_ptr, |
| 1517 | png_malloc_ptr malloc_fn, png_free_ptr free_fn)); |
| 1518 | #endif |
| 1519 | |
| 1520 | /* Write a PNG chunk - size, type, (optional) data, CRC. */ |
| 1521 | extern PNG_EXPORT(void,png_write_chunk) PNGARG((png_structp png_ptr, |
| 1522 | png_bytep chunk_name, png_bytep data, png_size_t length)); |
| 1523 | |
| 1524 | /* Write the start of a PNG chunk - length and chunk name. */ |
| 1525 | extern PNG_EXPORT(void,png_write_chunk_start) PNGARG((png_structp png_ptr, |
| 1526 | png_bytep chunk_name, png_uint_32 length)); |
| 1527 | |
| 1528 | /* Write the data of a PNG chunk started with png_write_chunk_start(). */ |
| 1529 | extern PNG_EXPORT(void,png_write_chunk_data) PNGARG((png_structp png_ptr, |
| 1530 | png_bytep data, png_size_t length)); |
| 1531 | |
| 1532 | /* Finish a chunk started with png_write_chunk_start() (includes CRC). */ |
| 1533 | extern PNG_EXPORT(void,png_write_chunk_end) PNGARG((png_structp png_ptr)); |
| 1534 | |
| 1535 | /* Allocate and initialize the info structure */ |
| 1536 | extern PNG_EXPORT(png_infop,png_create_info_struct) |
| 1537 | PNGARG((png_structp png_ptr)); |
| 1538 | |
| 1539 | #if defined(PNG_1_0_X) || defined (PNG_1_2_X) |
| 1540 | /* Initialize the info structure (old interface - DEPRECATED) */ |
| 1541 | extern PNG_EXPORT(void,png_info_init) PNGARG((png_infop info_ptr)); |
| 1542 | #undef png_info_init |
| 1543 | #define png_info_init(info_ptr) png_info_init_3(&info_ptr,\ |
| 1544 | png_sizeof(png_info)); |
| 1545 | #endif |
| 1546 | |
| 1547 | extern PNG_EXPORT(void,png_info_init_3) PNGARG((png_infopp info_ptr, |
| 1548 | png_size_t png_info_struct_size)); |
| 1549 | |
| 1550 | /* Writes all the PNG information before the image. */ |
| 1551 | extern PNG_EXPORT(void,png_write_info_before_PLTE) PNGARG((png_structp png_ptr, |
| 1552 | png_infop info_ptr)); |
| 1553 | extern PNG_EXPORT(void,png_write_info) PNGARG((png_structp png_ptr, |
| 1554 | png_infop info_ptr)); |
| 1555 | |
| 1556 | #ifndef PNG_NO_SEQUENTIAL_READ_SUPPORTED |
| 1557 | /* read the information before the actual image data. */ |
| 1558 | extern PNG_EXPORT(void,png_read_info) PNGARG((png_structp png_ptr, |
| 1559 | png_infop info_ptr)); |
| 1560 | #endif |
| 1561 | |
| 1562 | #if defined(PNG_TIME_RFC1123_SUPPORTED) |
| 1563 | extern PNG_EXPORT(png_charp,png_convert_to_rfc1123) |
| 1564 | PNGARG((png_structp png_ptr, png_timep ptime)); |
| 1565 | #endif |
| 1566 | |
| 1567 | #if !defined(_WIN32_WCE) |
| 1568 | /* "time.h" functions are not supported on WindowsCE */ |
| 1569 | #if defined(PNG_WRITE_tIME_SUPPORTED) |
| 1570 | /* convert from a struct tm to png_time */ |
| 1571 | extern PNG_EXPORT(void,png_convert_from_struct_tm) PNGARG((png_timep ptime, |
| 1572 | struct tm FAR * ttime)); |
| 1573 | |
| 1574 | /* convert from time_t to png_time. Uses gmtime() */ |
| 1575 | extern PNG_EXPORT(void,png_convert_from_time_t) PNGARG((png_timep ptime, |
| 1576 | time_t ttime)); |
| 1577 | #endif /* PNG_WRITE_tIME_SUPPORTED */ |
| 1578 | #endif /* _WIN32_WCE */ |
| 1579 | |
| 1580 | #if defined(PNG_READ_EXPAND_SUPPORTED) |
| 1581 | /* Expand data to 24-bit RGB, or 8-bit grayscale, with alpha if available. */ |
| 1582 | extern PNG_EXPORT(void,png_set_expand) PNGARG((png_structp png_ptr)); |
| 1583 | #if !defined(PNG_1_0_X) |
| 1584 | extern PNG_EXPORT(void,png_set_expand_gray_1_2_4_to_8) PNGARG((png_structp |
| 1585 | png_ptr)); |
| 1586 | #endif |
| 1587 | extern PNG_EXPORT(void,png_set_palette_to_rgb) PNGARG((png_structp png_ptr)); |
| 1588 | extern PNG_EXPORT(void,png_set_tRNS_to_alpha) PNGARG((png_structp png_ptr)); |
| 1589 | #if defined(PNG_1_0_X) || defined (PNG_1_2_X) |
| 1590 | /* Deprecated */ |
| 1591 | extern PNG_EXPORT(void,png_set_gray_1_2_4_to_8) PNGARG((png_structp png_ptr)); |
| 1592 | #endif |
| 1593 | #endif |
| 1594 | |
| 1595 | #if defined(PNG_READ_BGR_SUPPORTED) || defined(PNG_WRITE_BGR_SUPPORTED) |
| 1596 | /* Use blue, green, red order for pixels. */ |
| 1597 | extern PNG_EXPORT(void,png_set_bgr) PNGARG((png_structp png_ptr)); |
| 1598 | #endif |
| 1599 | |
| 1600 | #if defined(PNG_READ_GRAY_TO_RGB_SUPPORTED) |
| 1601 | /* Expand the grayscale to 24-bit RGB if necessary. */ |
| 1602 | extern PNG_EXPORT(void,png_set_gray_to_rgb) PNGARG((png_structp png_ptr)); |
| 1603 | #endif |
| 1604 | |
| 1605 | #if defined(PNG_READ_RGB_TO_GRAY_SUPPORTED) |
| 1606 | /* Reduce RGB to grayscale. */ |
| 1607 | #ifdef PNG_FLOATING_POINT_SUPPORTED |
| 1608 | extern PNG_EXPORT(void,png_set_rgb_to_gray) PNGARG((png_structp png_ptr, |
| 1609 | int error_action, double red, double green )); |
| 1610 | #endif |
| 1611 | extern PNG_EXPORT(void,png_set_rgb_to_gray_fixed) PNGARG((png_structp png_ptr, |
| 1612 | int error_action, png_fixed_point red, png_fixed_point green )); |
| 1613 | extern PNG_EXPORT(png_byte,png_get_rgb_to_gray_status) PNGARG((png_structp |
| 1614 | png_ptr)); |
| 1615 | #endif |
| 1616 | |
| 1617 | extern PNG_EXPORT(void,png_build_grayscale_palette) PNGARG((int bit_depth, |
| 1618 | png_colorp palette)); |
| 1619 | |
| 1620 | #if defined(PNG_READ_STRIP_ALPHA_SUPPORTED) |
| 1621 | extern PNG_EXPORT(void,png_set_strip_alpha) PNGARG((png_structp png_ptr)); |
| 1622 | #endif |
| 1623 | |
| 1624 | #if defined(PNG_READ_SWAP_ALPHA_SUPPORTED) || \ |
| 1625 | defined(PNG_WRITE_SWAP_ALPHA_SUPPORTED) |
| 1626 | extern PNG_EXPORT(void,png_set_swap_alpha) PNGARG((png_structp png_ptr)); |
| 1627 | #endif |
| 1628 | |
| 1629 | #if defined(PNG_READ_INVERT_ALPHA_SUPPORTED) || \ |
| 1630 | defined(PNG_WRITE_INVERT_ALPHA_SUPPORTED) |
| 1631 | extern PNG_EXPORT(void,png_set_invert_alpha) PNGARG((png_structp png_ptr)); |
| 1632 | #endif |
| 1633 | |
| 1634 | #if defined(PNG_READ_FILLER_SUPPORTED) || defined(PNG_WRITE_FILLER_SUPPORTED) |
| 1635 | /* Add a filler byte to 8-bit Gray or 24-bit RGB images. */ |
| 1636 | extern PNG_EXPORT(void,png_set_filler) PNGARG((png_structp png_ptr, |
| 1637 | png_uint_32 filler, int flags)); |
| 1638 | /* The values of the PNG_FILLER_ defines should NOT be changed */ |
| 1639 | #define PNG_FILLER_BEFORE 0 |
| 1640 | #define PNG_FILLER_AFTER 1 |
| 1641 | /* Add an alpha byte to 8-bit Gray or 24-bit RGB images. */ |
| 1642 | #if !defined(PNG_1_0_X) |
| 1643 | extern PNG_EXPORT(void,png_set_add_alpha) PNGARG((png_structp png_ptr, |
| 1644 | png_uint_32 filler, int flags)); |
| 1645 | #endif |
| 1646 | #endif /* PNG_READ_FILLER_SUPPORTED || PNG_WRITE_FILLER_SUPPORTED */ |
| 1647 | |
| 1648 | #if defined(PNG_READ_SWAP_SUPPORTED) || defined(PNG_WRITE_SWAP_SUPPORTED) |
| 1649 | /* Swap bytes in 16-bit depth files. */ |
| 1650 | extern PNG_EXPORT(void,png_set_swap) PNGARG((png_structp png_ptr)); |
| 1651 | #endif |
| 1652 | |
| 1653 | #if defined(PNG_READ_PACK_SUPPORTED) || defined(PNG_WRITE_PACK_SUPPORTED) |
| 1654 | /* Use 1 byte per pixel in 1, 2, or 4-bit depth files. */ |
| 1655 | extern PNG_EXPORT(void,png_set_packing) PNGARG((png_structp png_ptr)); |
| 1656 | #endif |
| 1657 | |
| 1658 | #if defined(PNG_READ_PACKSWAP_SUPPORTED) || defined(PNG_WRITE_PACKSWAP_SUPPORTED) |
| 1659 | /* Swap packing order of pixels in bytes. */ |
| 1660 | extern PNG_EXPORT(void,png_set_packswap) PNGARG((png_structp png_ptr)); |
| 1661 | #endif |
| 1662 | |
| 1663 | #if defined(PNG_READ_SHIFT_SUPPORTED) || defined(PNG_WRITE_SHIFT_SUPPORTED) |
| 1664 | /* Converts files to legal bit depths. */ |
| 1665 | extern PNG_EXPORT(void,png_set_shift) PNGARG((png_structp png_ptr, |
| 1666 | png_color_8p true_bits)); |
| 1667 | #endif |
| 1668 | |
| 1669 | #if defined(PNG_READ_INTERLACING_SUPPORTED) || \ |
| 1670 | defined(PNG_WRITE_INTERLACING_SUPPORTED) |
| 1671 | /* Have the code handle the interlacing. Returns the number of passes. */ |
| 1672 | extern PNG_EXPORT(int,png_set_interlace_handling) PNGARG((png_structp png_ptr)); |
| 1673 | #endif |
| 1674 | |
| 1675 | #if defined(PNG_READ_INVERT_SUPPORTED) || defined(PNG_WRITE_INVERT_SUPPORTED) |
| 1676 | /* Invert monochrome files */ |
| 1677 | extern PNG_EXPORT(void,png_set_invert_mono) PNGARG((png_structp png_ptr)); |
| 1678 | #endif |
| 1679 | |
| 1680 | #if defined(PNG_READ_BACKGROUND_SUPPORTED) |
| 1681 | /* Handle alpha and tRNS by replacing with a background color. */ |
| 1682 | #ifdef PNG_FLOATING_POINT_SUPPORTED |
| 1683 | extern PNG_EXPORT(void,png_set_background) PNGARG((png_structp png_ptr, |
| 1684 | png_color_16p background_color, int background_gamma_code, |
| 1685 | int need_expand, double background_gamma)); |
| 1686 | #endif |
| 1687 | #define PNG_BACKGROUND_GAMMA_UNKNOWN 0 |
| 1688 | #define PNG_BACKGROUND_GAMMA_SCREEN 1 |
| 1689 | #define PNG_BACKGROUND_GAMMA_FILE 2 |
| 1690 | #define PNG_BACKGROUND_GAMMA_UNIQUE 3 |
| 1691 | #endif |
| 1692 | |
| 1693 | #if defined(PNG_READ_16_TO_8_SUPPORTED) |
| 1694 | /* strip the second byte of information from a 16-bit depth file. */ |
| 1695 | extern PNG_EXPORT(void,png_set_strip_16) PNGARG((png_structp png_ptr)); |
| 1696 | #endif |
| 1697 | |
| 1698 | #if defined(PNG_READ_DITHER_SUPPORTED) |
| 1699 | /* Turn on dithering, and reduce the palette to the number of colors available. */ |
| 1700 | extern PNG_EXPORT(void,png_set_dither) PNGARG((png_structp png_ptr, |
| 1701 | png_colorp palette, int num_palette, int maximum_colors, |
| 1702 | png_uint_16p histogram, int full_dither)); |
| 1703 | #endif |
| 1704 | |
| 1705 | #if defined(PNG_READ_GAMMA_SUPPORTED) |
| 1706 | /* Handle gamma correction. Screen_gamma=(display_exponent) */ |
| 1707 | #ifdef PNG_FLOATING_POINT_SUPPORTED |
| 1708 | extern PNG_EXPORT(void,png_set_gamma) PNGARG((png_structp png_ptr, |
| 1709 | double screen_gamma, double default_file_gamma)); |
| 1710 | #endif |
| 1711 | #endif |
| 1712 | |
| 1713 | #if defined(PNG_1_0_X) || defined (PNG_1_2_X) |
| 1714 | #if defined(PNG_READ_EMPTY_PLTE_SUPPORTED) || \ |
| 1715 | defined(PNG_WRITE_EMPTY_PLTE_SUPPORTED) |
| 1716 | /* Permit or disallow empty PLTE (0: not permitted, 1: permitted) */ |
| 1717 | /* Deprecated and will be removed. Use png_permit_mng_features() instead. */ |
| 1718 | extern PNG_EXPORT(void,png_permit_empty_plte) PNGARG((png_structp png_ptr, |
| 1719 | int empty_plte_permitted)); |
| 1720 | #endif |
| 1721 | #endif |
| 1722 | |
| 1723 | #if defined(PNG_WRITE_FLUSH_SUPPORTED) |
| 1724 | /* Set how many lines between output flushes - 0 for no flushing */ |
| 1725 | extern PNG_EXPORT(void,png_set_flush) PNGARG((png_structp png_ptr, int nrows)); |
| 1726 | /* Flush the current PNG output buffer */ |
| 1727 | extern PNG_EXPORT(void,png_write_flush) PNGARG((png_structp png_ptr)); |
| 1728 | #endif |
| 1729 | |
| 1730 | /* optional update palette with requested transformations */ |
| 1731 | extern PNG_EXPORT(void,png_start_read_image) PNGARG((png_structp png_ptr)); |
| 1732 | |
| 1733 | /* optional call to update the users info structure */ |
| 1734 | extern PNG_EXPORT(void,png_read_update_info) PNGARG((png_structp png_ptr, |
| 1735 | png_infop info_ptr)); |
| 1736 | |
| 1737 | #ifndef PNG_NO_SEQUENTIAL_READ_SUPPORTED |
| 1738 | /* read one or more rows of image data. */ |
| 1739 | extern PNG_EXPORT(void,png_read_rows) PNGARG((png_structp png_ptr, |
| 1740 | png_bytepp row, png_bytepp display_row, png_uint_32 num_rows)); |
| 1741 | #endif |
| 1742 | |
| 1743 | #ifndef PNG_NO_SEQUENTIAL_READ_SUPPORTED |
| 1744 | /* read a row of data. */ |
| 1745 | extern PNG_EXPORT(void,png_read_row) PNGARG((png_structp png_ptr, |
| 1746 | png_bytep row, |
| 1747 | png_bytep display_row)); |
| 1748 | #endif |
| 1749 | |
| 1750 | #ifndef PNG_NO_SEQUENTIAL_READ_SUPPORTED |
| 1751 | /* read the whole image into memory at once. */ |
| 1752 | extern PNG_EXPORT(void,png_read_image) PNGARG((png_structp png_ptr, |
| 1753 | png_bytepp image)); |
| 1754 | #endif |
| 1755 | |
| 1756 | /* write a row of image data */ |
| 1757 | extern PNG_EXPORT(void,png_write_row) PNGARG((png_structp png_ptr, |
| 1758 | png_bytep row)); |
| 1759 | |
| 1760 | /* write a few rows of image data */ |
| 1761 | extern PNG_EXPORT(void,png_write_rows) PNGARG((png_structp png_ptr, |
| 1762 | png_bytepp row, png_uint_32 num_rows)); |
| 1763 | |
| 1764 | /* write the image data */ |
| 1765 | extern PNG_EXPORT(void,png_write_image) PNGARG((png_structp png_ptr, |
| 1766 | png_bytepp image)); |
| 1767 | |
| 1768 | /* writes the end of the PNG file. */ |
| 1769 | extern PNG_EXPORT(void,png_write_end) PNGARG((png_structp png_ptr, |
| 1770 | png_infop info_ptr)); |
| 1771 | |
| 1772 | #ifndef PNG_NO_SEQUENTIAL_READ_SUPPORTED |
| 1773 | /* read the end of the PNG file. */ |
| 1774 | extern PNG_EXPORT(void,png_read_end) PNGARG((png_structp png_ptr, |
| 1775 | png_infop info_ptr)); |
| 1776 | #endif |
| 1777 | |
| 1778 | /* free any memory associated with the png_info_struct */ |
| 1779 | extern PNG_EXPORT(void,png_destroy_info_struct) PNGARG((png_structp png_ptr, |
| 1780 | png_infopp info_ptr_ptr)); |
| 1781 | |
| 1782 | /* free any memory associated with the png_struct and the png_info_structs */ |
| 1783 | extern PNG_EXPORT(void,png_destroy_read_struct) PNGARG((png_structpp |
| 1784 | png_ptr_ptr, png_infopp info_ptr_ptr, png_infopp end_info_ptr_ptr)); |
| 1785 | |
| 1786 | /* free all memory used by the read (old method - NOT DLL EXPORTED) */ |
| 1787 | extern void png_read_destroy PNGARG((png_structp png_ptr, png_infop info_ptr, |
| 1788 | png_infop end_info_ptr)); |
| 1789 | |
| 1790 | /* free any memory associated with the png_struct and the png_info_structs */ |
| 1791 | extern PNG_EXPORT(void,png_destroy_write_struct) |
| 1792 | PNGARG((png_structpp png_ptr_ptr, png_infopp info_ptr_ptr)); |
| 1793 | |
| 1794 | /* free any memory used in png_ptr struct (old method - NOT DLL EXPORTED) */ |
| 1795 | extern void png_write_destroy PNGARG((png_structp png_ptr)); |
| 1796 | |
| 1797 | /* set the libpng method of handling chunk CRC errors */ |
| 1798 | extern PNG_EXPORT(void,png_set_crc_action) PNGARG((png_structp png_ptr, |
| 1799 | int crit_action, int ancil_action)); |
| 1800 | |
| 1801 | /* Values for png_set_crc_action() to say how to handle CRC errors in |
| 1802 | * ancillary and critical chunks, and whether to use the data contained |
| 1803 | * therein. Note that it is impossible to "discard" data in a critical |
| 1804 | * chunk. For versions prior to 0.90, the action was always error/quit, |
| 1805 | * whereas in version 0.90 and later, the action for CRC errors in ancillary |
| 1806 | * chunks is warn/discard. These values should NOT be changed. |
| 1807 | * |
| 1808 | * value action:critical action:ancillary |
| 1809 | */ |
| 1810 | #define PNG_CRC_DEFAULT 0 /* error/quit warn/discard data */ |
| 1811 | #define PNG_CRC_ERROR_QUIT 1 /* error/quit error/quit */ |
| 1812 | #define PNG_CRC_WARN_DISCARD 2 /* (INVALID) warn/discard data */ |
| 1813 | #define PNG_CRC_WARN_USE 3 /* warn/use data warn/use data */ |
| 1814 | #define PNG_CRC_QUIET_USE 4 /* quiet/use data quiet/use data */ |
| 1815 | #define PNG_CRC_NO_CHANGE 5 /* use current value use current value */ |
| 1816 | |
| 1817 | /* These functions give the user control over the scan-line filtering in |
| 1818 | * libpng and the compression methods used by zlib. These functions are |
| 1819 | * mainly useful for testing, as the defaults should work with most users. |
| 1820 | * Those users who are tight on memory or want faster performance at the |
| 1821 | * expense of compression can modify them. See the compression library |
| 1822 | * header file (zlib.h) for an explination of the compression functions. |
| 1823 | */ |
| 1824 | |
| 1825 | /* set the filtering method(s) used by libpng. Currently, the only valid |
| 1826 | * value for "method" is 0. |
| 1827 | */ |
| 1828 | extern PNG_EXPORT(void,png_set_filter) PNGARG((png_structp png_ptr, int method, |
| 1829 | int filters)); |
| 1830 | |
| 1831 | /* Flags for png_set_filter() to say which filters to use. The flags |
| 1832 | * are chosen so that they don't conflict with real filter types |
| 1833 | * below, in case they are supplied instead of the #defined constants. |
| 1834 | * These values should NOT be changed. |
| 1835 | */ |
| 1836 | #define PNG_NO_FILTERS 0x00 |
| 1837 | #define PNG_FILTER_NONE 0x08 |
| 1838 | #define PNG_FILTER_SUB 0x10 |
| 1839 | #define PNG_FILTER_UP 0x20 |
| 1840 | #define PNG_FILTER_AVG 0x40 |
| 1841 | #define PNG_FILTER_PAETH 0x80 |
| 1842 | #define PNG_ALL_FILTERS (PNG_FILTER_NONE | PNG_FILTER_SUB | PNG_FILTER_UP | \ |
| 1843 | PNG_FILTER_AVG | PNG_FILTER_PAETH) |
| 1844 | |
| 1845 | /* Filter values (not flags) - used in pngwrite.c, pngwutil.c for now. |
| 1846 | * These defines should NOT be changed. |
| 1847 | */ |
| 1848 | #define PNG_FILTER_VALUE_NONE 0 |
| 1849 | #define PNG_FILTER_VALUE_SUB 1 |
| 1850 | #define PNG_FILTER_VALUE_UP 2 |
| 1851 | #define PNG_FILTER_VALUE_AVG 3 |
| 1852 | #define PNG_FILTER_VALUE_PAETH 4 |
| 1853 | #define PNG_FILTER_VALUE_LAST 5 |
| 1854 | |
| 1855 | #if defined(PNG_WRITE_WEIGHTED_FILTER_SUPPORTED) /* EXPERIMENTAL */ |
| 1856 | /* The "heuristic_method" is given by one of the PNG_FILTER_HEURISTIC_ |
| 1857 | * defines, either the default (minimum-sum-of-absolute-differences), or |
| 1858 | * the experimental method (weighted-minimum-sum-of-absolute-differences). |
| 1859 | * |
| 1860 | * Weights are factors >= 1.0, indicating how important it is to keep the |
| 1861 | * filter type consistent between rows. Larger numbers mean the current |
| 1862 | * filter is that many times as likely to be the same as the "num_weights" |
| 1863 | * previous filters. This is cumulative for each previous row with a weight. |
| 1864 | * There needs to be "num_weights" values in "filter_weights", or it can be |
| 1865 | * NULL if the weights aren't being specified. Weights have no influence on |
| 1866 | * the selection of the first row filter. Well chosen weights can (in theory) |
| 1867 | * improve the compression for a given image. |
| 1868 | * |
| 1869 | * Costs are factors >= 1.0 indicating the relative decoding costs of a |
| 1870 | * filter type. Higher costs indicate more decoding expense, and are |
| 1871 | * therefore less likely to be selected over a filter with lower computational |
| 1872 | * costs. There needs to be a value in "filter_costs" for each valid filter |
| 1873 | * type (given by PNG_FILTER_VALUE_LAST), or it can be NULL if you aren't |
| 1874 | * setting the costs. Costs try to improve the speed of decompression without |
| 1875 | * unduly increasing the compressed image size. |
| 1876 | * |
| 1877 | * A negative weight or cost indicates the default value is to be used, and |
| 1878 | * values in the range [0.0, 1.0) indicate the value is to remain unchanged. |
| 1879 | * The default values for both weights and costs are currently 1.0, but may |
| 1880 | * change if good general weighting/cost heuristics can be found. If both |
| 1881 | * the weights and costs are set to 1.0, this degenerates the WEIGHTED method |
| 1882 | * to the UNWEIGHTED method, but with added encoding time/computation. |
| 1883 | */ |
| 1884 | #ifdef PNG_FLOATING_POINT_SUPPORTED |
| 1885 | extern PNG_EXPORT(void,png_set_filter_heuristics) PNGARG((png_structp png_ptr, |
| 1886 | int heuristic_method, int num_weights, png_doublep filter_weights, |
| 1887 | png_doublep filter_costs)); |
| 1888 | #endif |
| 1889 | #endif /* PNG_WRITE_WEIGHTED_FILTER_SUPPORTED */ |
| 1890 | |
| 1891 | /* Heuristic used for row filter selection. These defines should NOT be |
| 1892 | * changed. |
| 1893 | */ |
| 1894 | #define PNG_FILTER_HEURISTIC_DEFAULT 0 /* Currently "UNWEIGHTED" */ |
| 1895 | #define PNG_FILTER_HEURISTIC_UNWEIGHTED 1 /* Used by libpng < 0.95 */ |
| 1896 | #define PNG_FILTER_HEURISTIC_WEIGHTED 2 /* Experimental feature */ |
| 1897 | #define PNG_FILTER_HEURISTIC_LAST 3 /* Not a valid value */ |
| 1898 | |
| 1899 | /* Set the library compression level. Currently, valid values range from |
| 1900 | * 0 - 9, corresponding directly to the zlib compression levels 0 - 9 |
| 1901 | * (0 - no compression, 9 - "maximal" compression). Note that tests have |
| 1902 | * shown that zlib compression levels 3-6 usually perform as well as level 9 |
| 1903 | * for PNG images, and do considerably fewer caclulations. In the future, |
| 1904 | * these values may not correspond directly to the zlib compression levels. |
| 1905 | */ |
| 1906 | extern PNG_EXPORT(void,png_set_compression_level) PNGARG((png_structp png_ptr, |
| 1907 | int level)); |
| 1908 | |
| 1909 | extern PNG_EXPORT(void,png_set_compression_mem_level) |
| 1910 | PNGARG((png_structp png_ptr, int mem_level)); |
| 1911 | |
| 1912 | extern PNG_EXPORT(void,png_set_compression_strategy) |
| 1913 | PNGARG((png_structp png_ptr, int strategy)); |
| 1914 | |
| 1915 | extern PNG_EXPORT(void,png_set_compression_window_bits) |
| 1916 | PNGARG((png_structp png_ptr, int window_bits)); |
| 1917 | |
| 1918 | extern PNG_EXPORT(void,png_set_compression_method) PNGARG((png_structp png_ptr, |
| 1919 | int method)); |
| 1920 | |
| 1921 | /* These next functions are called for input/output, memory, and error |
| 1922 | * handling. They are in the file pngrio.c, pngwio.c, and pngerror.c, |
| 1923 | * and call standard C I/O routines such as fread(), fwrite(), and |
| 1924 | * fprintf(). These functions can be made to use other I/O routines |
| 1925 | * at run time for those applications that need to handle I/O in a |
| 1926 | * different manner by calling png_set_???_fn(). See libpng.txt for |
| 1927 | * more information. |
| 1928 | */ |
| 1929 | |
| 1930 | #if !defined(PNG_NO_STDIO) |
| 1931 | /* Initialize the input/output for the PNG file to the default functions. */ |
| 1932 | extern PNG_EXPORT(void,png_init_io) PNGARG((png_structp png_ptr, png_FILE_p fp)); |
| 1933 | #endif |
| 1934 | |
| 1935 | /* Replace the (error and abort), and warning functions with user |
| 1936 | * supplied functions. If no messages are to be printed you must still |
| 1937 | * write and use replacement functions. The replacement error_fn should |
| 1938 | * still do a longjmp to the last setjmp location if you are using this |
| 1939 | * method of error handling. If error_fn or warning_fn is NULL, the |
| 1940 | * default function will be used. |
| 1941 | */ |
| 1942 | |
| 1943 | extern PNG_EXPORT(void,png_set_error_fn) PNGARG((png_structp png_ptr, |
| 1944 | png_voidp error_ptr, png_error_ptr error_fn, png_error_ptr warning_fn)); |
| 1945 | |
| 1946 | /* Return the user pointer associated with the error functions */ |
| 1947 | extern PNG_EXPORT(png_voidp,png_get_error_ptr) PNGARG((png_structp png_ptr)); |
| 1948 | |
| 1949 | /* Replace the default data output functions with a user supplied one(s). |
| 1950 | * If buffered output is not used, then output_flush_fn can be set to NULL. |
| 1951 | * If PNG_WRITE_FLUSH_SUPPORTED is not defined at libpng compile time |
| 1952 | * output_flush_fn will be ignored (and thus can be NULL). |
| 1953 | */ |
| 1954 | extern PNG_EXPORT(void,png_set_write_fn) PNGARG((png_structp png_ptr, |
| 1955 | png_voidp io_ptr, png_rw_ptr write_data_fn, png_flush_ptr output_flush_fn)); |
| 1956 | |
| 1957 | /* Replace the default data input function with a user supplied one. */ |
| 1958 | extern PNG_EXPORT(void,png_set_read_fn) PNGARG((png_structp png_ptr, |
| 1959 | png_voidp io_ptr, png_rw_ptr read_data_fn)); |
| 1960 | |
| 1961 | /* Return the user pointer associated with the I/O functions */ |
| 1962 | extern PNG_EXPORT(png_voidp,png_get_io_ptr) PNGARG((png_structp png_ptr)); |
| 1963 | |
| 1964 | extern PNG_EXPORT(void,png_set_read_status_fn) PNGARG((png_structp png_ptr, |
| 1965 | png_read_status_ptr read_row_fn)); |
| 1966 | |
| 1967 | extern PNG_EXPORT(void,png_set_write_status_fn) PNGARG((png_structp png_ptr, |
| 1968 | png_write_status_ptr write_row_fn)); |
| 1969 | |
| 1970 | #ifdef PNG_USER_MEM_SUPPORTED |
| 1971 | /* Replace the default memory allocation functions with user supplied one(s). */ |
| 1972 | extern PNG_EXPORT(void,png_set_mem_fn) PNGARG((png_structp png_ptr, |
| 1973 | png_voidp mem_ptr, png_malloc_ptr malloc_fn, png_free_ptr free_fn)); |
| 1974 | /* Return the user pointer associated with the memory functions */ |
| 1975 | extern PNG_EXPORT(png_voidp,png_get_mem_ptr) PNGARG((png_structp png_ptr)); |
| 1976 | #endif |
| 1977 | |
| 1978 | #if defined(PNG_READ_USER_TRANSFORM_SUPPORTED) || \ |
| 1979 | defined(PNG_LEGACY_SUPPORTED) |
| 1980 | extern PNG_EXPORT(void,png_set_read_user_transform_fn) PNGARG((png_structp |
| 1981 | png_ptr, png_user_transform_ptr read_user_transform_fn)); |
| 1982 | #endif |
| 1983 | |
| 1984 | #if defined(PNG_WRITE_USER_TRANSFORM_SUPPORTED) || \ |
| 1985 | defined(PNG_LEGACY_SUPPORTED) |
| 1986 | extern PNG_EXPORT(void,png_set_write_user_transform_fn) PNGARG((png_structp |
| 1987 | png_ptr, png_user_transform_ptr write_user_transform_fn)); |
| 1988 | #endif |
| 1989 | |
| 1990 | #if defined(PNG_READ_USER_TRANSFORM_SUPPORTED) || \ |
| 1991 | defined(PNG_WRITE_USER_TRANSFORM_SUPPORTED) || \ |
| 1992 | defined(PNG_LEGACY_SUPPORTED) |
| 1993 | extern PNG_EXPORT(void,png_set_user_transform_info) PNGARG((png_structp |
| 1994 | png_ptr, png_voidp user_transform_ptr, int user_transform_depth, |
| 1995 | int user_transform_channels)); |
| 1996 | /* Return the user pointer associated with the user transform functions */ |
| 1997 | extern PNG_EXPORT(png_voidp,png_get_user_transform_ptr) |
| 1998 | PNGARG((png_structp png_ptr)); |
| 1999 | #endif |
| 2000 | |
| 2001 | #ifdef PNG_USER_CHUNKS_SUPPORTED |
| 2002 | extern PNG_EXPORT(void,png_set_read_user_chunk_fn) PNGARG((png_structp png_ptr, |
| 2003 | png_voidp user_chunk_ptr, png_user_chunk_ptr read_user_chunk_fn)); |
| 2004 | extern PNG_EXPORT(png_voidp,png_get_user_chunk_ptr) PNGARG((png_structp |
| 2005 | png_ptr)); |
| 2006 | #endif |
| 2007 | |
| 2008 | #ifdef PNG_PROGRESSIVE_READ_SUPPORTED |
| 2009 | /* Sets the function callbacks for the push reader, and a pointer to a |
| 2010 | * user-defined structure available to the callback functions. |
| 2011 | */ |
| 2012 | extern PNG_EXPORT(void,png_set_progressive_read_fn) PNGARG((png_structp png_ptr, |
| 2013 | png_voidp progressive_ptr, |
| 2014 | png_progressive_info_ptr info_fn, png_progressive_row_ptr row_fn, |
| 2015 | png_progressive_end_ptr end_fn)); |
| 2016 | |
| 2017 | /* returns the user pointer associated with the push read functions */ |
| 2018 | extern PNG_EXPORT(png_voidp,png_get_progressive_ptr) |
| 2019 | PNGARG((png_structp png_ptr)); |
| 2020 | |
| 2021 | /* function to be called when data becomes available */ |
| 2022 | extern PNG_EXPORT(void,png_process_data) PNGARG((png_structp png_ptr, |
| 2023 | png_infop info_ptr, png_bytep buffer, png_size_t buffer_size)); |
| 2024 | |
| 2025 | /* function that combines rows. Not very much different than the |
| 2026 | * png_combine_row() call. Is this even used????? |
| 2027 | */ |
| 2028 | extern PNG_EXPORT(void,png_progressive_combine_row) PNGARG((png_structp png_ptr, |
| 2029 | png_bytep old_row, png_bytep new_row)); |
| 2030 | #endif /* PNG_PROGRESSIVE_READ_SUPPORTED */ |
| 2031 | |
| 2032 | extern PNG_EXPORT(png_voidp,png_malloc) PNGARG((png_structp png_ptr, |
| 2033 | png_uint_32 size)); |
| 2034 | |
| 2035 | #if defined(PNG_1_0_X) |
| 2036 | # define png_malloc_warn png_malloc |
| 2037 | #else |
| 2038 | /* Added at libpng version 1.2.4 */ |
| 2039 | extern PNG_EXPORT(png_voidp,png_malloc_warn) PNGARG((png_structp png_ptr, |
| 2040 | png_uint_32 size)); |
| 2041 | #endif |
| 2042 | |
| 2043 | /* frees a pointer allocated by png_malloc() */ |
| 2044 | extern PNG_EXPORT(void,png_free) PNGARG((png_structp png_ptr, png_voidp ptr)); |
| 2045 | |
| 2046 | #if defined(PNG_1_0_X) |
| 2047 | /* Function to allocate memory for zlib. */ |
| 2048 | extern PNG_EXPORT(voidpf,png_zalloc) PNGARG((voidpf png_ptr, uInt items, |
| 2049 | uInt size)); |
| 2050 | |
| 2051 | /* Function to free memory for zlib */ |
| 2052 | extern PNG_EXPORT(void,png_zfree) PNGARG((voidpf png_ptr, voidpf ptr)); |
| 2053 | #endif |
| 2054 | |
| 2055 | /* Free data that was allocated internally */ |
| 2056 | extern PNG_EXPORT(void,png_free_data) PNGARG((png_structp png_ptr, |
| 2057 | png_infop info_ptr, png_uint_32 free_me, int num)); |
| 2058 | #ifdef PNG_FREE_ME_SUPPORTED |
| 2059 | /* Reassign responsibility for freeing existing data, whether allocated |
| 2060 | * by libpng or by the application */ |
| 2061 | extern PNG_EXPORT(void,png_data_freer) PNGARG((png_structp png_ptr, |
| 2062 | png_infop info_ptr, int freer, png_uint_32 mask)); |
| 2063 | #endif |
| 2064 | /* assignments for png_data_freer */ |
| 2065 | #define PNG_DESTROY_WILL_FREE_DATA 1 |
| 2066 | #define PNG_SET_WILL_FREE_DATA 1 |
| 2067 | #define PNG_USER_WILL_FREE_DATA 2 |
| 2068 | /* Flags for png_ptr->free_me and info_ptr->free_me */ |
| 2069 | #define PNG_FREE_HIST 0x0008 |
| 2070 | #define PNG_FREE_ICCP 0x0010 |
| 2071 | #define PNG_FREE_SPLT 0x0020 |
| 2072 | #define PNG_FREE_ROWS 0x0040 |
| 2073 | #define PNG_FREE_PCAL 0x0080 |
| 2074 | #define PNG_FREE_SCAL 0x0100 |
| 2075 | #define PNG_FREE_UNKN 0x0200 |
| 2076 | #define PNG_FREE_LIST 0x0400 |
| 2077 | #define PNG_FREE_PLTE 0x1000 |
| 2078 | #define PNG_FREE_TRNS 0x2000 |
| 2079 | #define PNG_FREE_TEXT 0x4000 |
| 2080 | #define PNG_FREE_ALL 0x7fff |
| 2081 | #define PNG_FREE_MUL 0x4220 /* PNG_FREE_SPLT|PNG_FREE_TEXT|PNG_FREE_UNKN */ |
| 2082 | |
| 2083 | #ifdef PNG_USER_MEM_SUPPORTED |
| 2084 | extern PNG_EXPORT(png_voidp,png_malloc_default) PNGARG((png_structp png_ptr, |
| 2085 | png_uint_32 size)); |
| 2086 | extern PNG_EXPORT(void,png_free_default) PNGARG((png_structp png_ptr, |
| 2087 | png_voidp ptr)); |
| 2088 | #endif |
| 2089 | |
| 2090 | extern PNG_EXPORT(png_voidp,png_memcpy_check) PNGARG((png_structp png_ptr, |
| 2091 | png_voidp s1, png_voidp s2, png_uint_32 size)); |
| 2092 | |
| 2093 | extern PNG_EXPORT(png_voidp,png_memset_check) PNGARG((png_structp png_ptr, |
| 2094 | png_voidp s1, int value, png_uint_32 size)); |
| 2095 | |
| 2096 | #if defined(USE_FAR_KEYWORD) /* memory model conversion function */ |
| 2097 | extern void *png_far_to_near PNGARG((png_structp png_ptr,png_voidp ptr, |
| 2098 | int check)); |
| 2099 | #endif /* USE_FAR_KEYWORD */ |
| 2100 | |
| 2101 | #ifndef PNG_NO_ERROR_TEXT |
| 2102 | /* Fatal error in PNG image of libpng - can't continue */ |
| 2103 | extern PNG_EXPORT(void,png_error) PNGARG((png_structp png_ptr, |
| 2104 | png_const_charp error_message)); |
| 2105 | |
| 2106 | /* The same, but the chunk name is prepended to the error string. */ |
| 2107 | extern PNG_EXPORT(void,png_chunk_error) PNGARG((png_structp png_ptr, |
| 2108 | png_const_charp error_message)); |
| 2109 | #else |
| 2110 | /* Fatal error in PNG image of libpng - can't continue */ |
| 2111 | extern PNG_EXPORT(void,png_err) PNGARG((png_structp png_ptr)); |
| 2112 | #endif |
| 2113 | |
| 2114 | #ifndef PNG_NO_WARNINGS |
| 2115 | /* Non-fatal error in libpng. Can continue, but may have a problem. */ |
| 2116 | extern PNG_EXPORT(void,png_warning) PNGARG((png_structp png_ptr, |
| 2117 | png_const_charp warning_message)); |
| 2118 | |
| 2119 | #ifdef PNG_READ_SUPPORTED |
| 2120 | /* Non-fatal error in libpng, chunk name is prepended to message. */ |
| 2121 | extern PNG_EXPORT(void,png_chunk_warning) PNGARG((png_structp png_ptr, |
| 2122 | png_const_charp warning_message)); |
| 2123 | #endif /* PNG_READ_SUPPORTED */ |
| 2124 | #endif /* PNG_NO_WARNINGS */ |
| 2125 | |
| 2126 | /* The png_set_<chunk> functions are for storing values in the png_info_struct. |
| 2127 | * Similarly, the png_get_<chunk> calls are used to read values from the |
| 2128 | * png_info_struct, either storing the parameters in the passed variables, or |
| 2129 | * setting pointers into the png_info_struct where the data is stored. The |
| 2130 | * png_get_<chunk> functions return a non-zero value if the data was available |
| 2131 | * in info_ptr, or return zero and do not change any of the parameters if the |
| 2132 | * data was not available. |
| 2133 | * |
| 2134 | * These functions should be used instead of directly accessing png_info |
| 2135 | * to avoid problems with future changes in the size and internal layout of |
| 2136 | * png_info_struct. |
| 2137 | */ |
| 2138 | /* Returns "flag" if chunk data is valid in info_ptr. */ |
| 2139 | extern PNG_EXPORT(png_uint_32,png_get_valid) PNGARG((png_structp png_ptr, |
| 2140 | png_infop info_ptr, png_uint_32 flag)); |
| 2141 | |
| 2142 | /* Returns number of bytes needed to hold a transformed row. */ |
| 2143 | extern PNG_EXPORT(png_uint_32,png_get_rowbytes) PNGARG((png_structp png_ptr, |
| 2144 | png_infop info_ptr)); |
| 2145 | |
| 2146 | #if defined(PNG_INFO_IMAGE_SUPPORTED) |
| 2147 | /* Returns row_pointers, which is an array of pointers to scanlines that was |
| 2148 | returned from png_read_png(). */ |
| 2149 | extern PNG_EXPORT(png_bytepp,png_get_rows) PNGARG((png_structp png_ptr, |
| 2150 | png_infop info_ptr)); |
| 2151 | /* Set row_pointers, which is an array of pointers to scanlines for use |
| 2152 | by png_write_png(). */ |
| 2153 | extern PNG_EXPORT(void,png_set_rows) PNGARG((png_structp png_ptr, |
| 2154 | png_infop info_ptr, png_bytepp row_pointers)); |
| 2155 | #endif |
| 2156 | |
| 2157 | /* Returns number of color channels in image. */ |
| 2158 | extern PNG_EXPORT(png_byte,png_get_channels) PNGARG((png_structp png_ptr, |
| 2159 | png_infop info_ptr)); |
| 2160 | |
| 2161 | #ifdef PNG_EASY_ACCESS_SUPPORTED |
| 2162 | /* Returns image width in pixels. */ |
| 2163 | extern PNG_EXPORT(png_uint_32, png_get_image_width) PNGARG((png_structp |
| 2164 | png_ptr, png_infop info_ptr)); |
| 2165 | |
| 2166 | /* Returns image height in pixels. */ |
| 2167 | extern PNG_EXPORT(png_uint_32, png_get_image_height) PNGARG((png_structp |
| 2168 | png_ptr, png_infop info_ptr)); |
| 2169 | |
| 2170 | /* Returns image bit_depth. */ |
| 2171 | extern PNG_EXPORT(png_byte, png_get_bit_depth) PNGARG((png_structp |
| 2172 | png_ptr, png_infop info_ptr)); |
| 2173 | |
| 2174 | /* Returns image color_type. */ |
| 2175 | extern PNG_EXPORT(png_byte, png_get_color_type) PNGARG((png_structp |
| 2176 | png_ptr, png_infop info_ptr)); |
| 2177 | |
| 2178 | /* Returns image filter_type. */ |
| 2179 | extern PNG_EXPORT(png_byte, png_get_filter_type) PNGARG((png_structp |
| 2180 | png_ptr, png_infop info_ptr)); |
| 2181 | |
| 2182 | /* Returns image interlace_type. */ |
| 2183 | extern PNG_EXPORT(png_byte, png_get_interlace_type) PNGARG((png_structp |
| 2184 | png_ptr, png_infop info_ptr)); |
| 2185 | |
| 2186 | /* Returns image compression_type. */ |
| 2187 | extern PNG_EXPORT(png_byte, png_get_compression_type) PNGARG((png_structp |
| 2188 | png_ptr, png_infop info_ptr)); |
| 2189 | |
| 2190 | /* Returns image resolution in pixels per meter, from pHYs chunk data. */ |
| 2191 | extern PNG_EXPORT(png_uint_32, png_get_pixels_per_meter) PNGARG((png_structp |
| 2192 | png_ptr, png_infop info_ptr)); |
| 2193 | extern PNG_EXPORT(png_uint_32, png_get_x_pixels_per_meter) PNGARG((png_structp |
| 2194 | png_ptr, png_infop info_ptr)); |
| 2195 | extern PNG_EXPORT(png_uint_32, png_get_y_pixels_per_meter) PNGARG((png_structp |
| 2196 | png_ptr, png_infop info_ptr)); |
| 2197 | |
| 2198 | /* Returns pixel aspect ratio, computed from pHYs chunk data. */ |
| 2199 | #ifdef PNG_FLOATING_POINT_SUPPORTED |
| 2200 | extern PNG_EXPORT(float, png_get_pixel_aspect_ratio) PNGARG((png_structp |
| 2201 | png_ptr, png_infop info_ptr)); |
| 2202 | #endif |
| 2203 | |
| 2204 | /* Returns image x, y offset in pixels or microns, from oFFs chunk data. */ |
| 2205 | extern PNG_EXPORT(png_int_32, png_get_x_offset_pixels) PNGARG((png_structp |
| 2206 | png_ptr, png_infop info_ptr)); |
| 2207 | extern PNG_EXPORT(png_int_32, png_get_y_offset_pixels) PNGARG((png_structp |
| 2208 | png_ptr, png_infop info_ptr)); |
| 2209 | extern PNG_EXPORT(png_int_32, png_get_x_offset_microns) PNGARG((png_structp |
| 2210 | png_ptr, png_infop info_ptr)); |
| 2211 | extern PNG_EXPORT(png_int_32, png_get_y_offset_microns) PNGARG((png_structp |
| 2212 | png_ptr, png_infop info_ptr)); |
| 2213 | |
| 2214 | #endif /* PNG_EASY_ACCESS_SUPPORTED */ |
| 2215 | |
| 2216 | /* Returns pointer to signature string read from PNG header */ |
| 2217 | extern PNG_EXPORT(png_bytep,png_get_signature) PNGARG((png_structp png_ptr, |
| 2218 | png_infop info_ptr)); |
| 2219 | |
| 2220 | #if defined(PNG_bKGD_SUPPORTED) |
| 2221 | extern PNG_EXPORT(png_uint_32,png_get_bKGD) PNGARG((png_structp png_ptr, |
| 2222 | png_infop info_ptr, png_color_16p *background)); |
| 2223 | #endif |
| 2224 | |
| 2225 | #if defined(PNG_bKGD_SUPPORTED) |
| 2226 | extern PNG_EXPORT(void,png_set_bKGD) PNGARG((png_structp png_ptr, |
| 2227 | png_infop info_ptr, png_color_16p background)); |
| 2228 | #endif |
| 2229 | |
| 2230 | #if defined(PNG_cHRM_SUPPORTED) |
| 2231 | #ifdef PNG_FLOATING_POINT_SUPPORTED |
| 2232 | extern PNG_EXPORT(png_uint_32,png_get_cHRM) PNGARG((png_structp png_ptr, |
| 2233 | png_infop info_ptr, double *white_x, double *white_y, double *red_x, |
| 2234 | double *red_y, double *green_x, double *green_y, double *blue_x, |
| 2235 | double *blue_y)); |
| 2236 | #endif |
| 2237 | #ifdef PNG_FIXED_POINT_SUPPORTED |
| 2238 | extern PNG_EXPORT(png_uint_32,png_get_cHRM_fixed) PNGARG((png_structp png_ptr, |
| 2239 | png_infop info_ptr, png_fixed_point *int_white_x, png_fixed_point |
| 2240 | *int_white_y, png_fixed_point *int_red_x, png_fixed_point *int_red_y, |
| 2241 | png_fixed_point *int_green_x, png_fixed_point *int_green_y, png_fixed_point |
| 2242 | *int_blue_x, png_fixed_point *int_blue_y)); |
| 2243 | #endif |
| 2244 | #endif |
| 2245 | |
| 2246 | #if defined(PNG_cHRM_SUPPORTED) |
| 2247 | #ifdef PNG_FLOATING_POINT_SUPPORTED |
| 2248 | extern PNG_EXPORT(void,png_set_cHRM) PNGARG((png_structp png_ptr, |
| 2249 | png_infop info_ptr, double white_x, double white_y, double red_x, |
| 2250 | double red_y, double green_x, double green_y, double blue_x, double blue_y)); |
| 2251 | #endif |
| 2252 | #ifdef PNG_FIXED_POINT_SUPPORTED |
| 2253 | extern PNG_EXPORT(void,png_set_cHRM_fixed) PNGARG((png_structp png_ptr, |
| 2254 | png_infop info_ptr, png_fixed_point int_white_x, png_fixed_point int_white_y, |
| 2255 | png_fixed_point int_red_x, png_fixed_point int_red_y, png_fixed_point |
| 2256 | int_green_x, png_fixed_point int_green_y, png_fixed_point int_blue_x, |
| 2257 | png_fixed_point int_blue_y)); |
| 2258 | #endif |
| 2259 | #endif |
| 2260 | |
| 2261 | #if defined(PNG_gAMA_SUPPORTED) |
| 2262 | #ifdef PNG_FLOATING_POINT_SUPPORTED |
| 2263 | extern PNG_EXPORT(png_uint_32,png_get_gAMA) PNGARG((png_structp png_ptr, |
| 2264 | png_infop info_ptr, double *file_gamma)); |
| 2265 | #endif |
| 2266 | extern PNG_EXPORT(png_uint_32,png_get_gAMA_fixed) PNGARG((png_structp png_ptr, |
| 2267 | png_infop info_ptr, png_fixed_point *int_file_gamma)); |
| 2268 | #endif |
| 2269 | |
| 2270 | #if defined(PNG_gAMA_SUPPORTED) |
| 2271 | #ifdef PNG_FLOATING_POINT_SUPPORTED |
| 2272 | extern PNG_EXPORT(void,png_set_gAMA) PNGARG((png_structp png_ptr, |
| 2273 | png_infop info_ptr, double file_gamma)); |
| 2274 | #endif |
| 2275 | extern PNG_EXPORT(void,png_set_gAMA_fixed) PNGARG((png_structp png_ptr, |
| 2276 | png_infop info_ptr, png_fixed_point int_file_gamma)); |
| 2277 | #endif |
| 2278 | |
| 2279 | #if defined(PNG_hIST_SUPPORTED) |
| 2280 | extern PNG_EXPORT(png_uint_32,png_get_hIST) PNGARG((png_structp png_ptr, |
| 2281 | png_infop info_ptr, png_uint_16p *hist)); |
| 2282 | #endif |
| 2283 | |
| 2284 | #if defined(PNG_hIST_SUPPORTED) |
| 2285 | extern PNG_EXPORT(void,png_set_hIST) PNGARG((png_structp png_ptr, |
| 2286 | png_infop info_ptr, png_uint_16p hist)); |
| 2287 | #endif |
| 2288 | |
| 2289 | extern PNG_EXPORT(png_uint_32,png_get_IHDR) PNGARG((png_structp png_ptr, |
| 2290 | png_infop info_ptr, png_uint_32 *width, png_uint_32 *height, |
| 2291 | int *bit_depth, int *color_type, int *interlace_method, |
| 2292 | int *compression_method, int *filter_method)); |
| 2293 | |
| 2294 | extern PNG_EXPORT(void,png_set_IHDR) PNGARG((png_structp png_ptr, |
| 2295 | png_infop info_ptr, png_uint_32 width, png_uint_32 height, int bit_depth, |
| 2296 | int color_type, int interlace_method, int compression_method, |
| 2297 | int filter_method)); |
| 2298 | |
| 2299 | #if defined(PNG_oFFs_SUPPORTED) |
| 2300 | extern PNG_EXPORT(png_uint_32,png_get_oFFs) PNGARG((png_structp png_ptr, |
| 2301 | png_infop info_ptr, png_int_32 *offset_x, png_int_32 *offset_y, |
| 2302 | int *unit_type)); |
| 2303 | #endif |
| 2304 | |
| 2305 | #if defined(PNG_oFFs_SUPPORTED) |
| 2306 | extern PNG_EXPORT(void,png_set_oFFs) PNGARG((png_structp png_ptr, |
| 2307 | png_infop info_ptr, png_int_32 offset_x, png_int_32 offset_y, |
| 2308 | int unit_type)); |
| 2309 | #endif |
| 2310 | |
| 2311 | #if defined(PNG_pCAL_SUPPORTED) |
| 2312 | extern PNG_EXPORT(png_uint_32,png_get_pCAL) PNGARG((png_structp png_ptr, |
| 2313 | png_infop info_ptr, png_charp *purpose, png_int_32 *X0, png_int_32 *X1, |
| 2314 | int *type, int *nparams, png_charp *units, png_charpp *params)); |
| 2315 | #endif |
| 2316 | |
| 2317 | #if defined(PNG_pCAL_SUPPORTED) |
| 2318 | extern PNG_EXPORT(void,png_set_pCAL) PNGARG((png_structp png_ptr, |
| 2319 | png_infop info_ptr, png_charp purpose, png_int_32 X0, png_int_32 X1, |
| 2320 | int type, int nparams, png_charp units, png_charpp params)); |
| 2321 | #endif |
| 2322 | |
| 2323 | #if defined(PNG_pHYs_SUPPORTED) |
| 2324 | extern PNG_EXPORT(png_uint_32,png_get_pHYs) PNGARG((png_structp png_ptr, |
| 2325 | png_infop info_ptr, png_uint_32 *res_x, png_uint_32 *res_y, int *unit_type)); |
| 2326 | #endif |
| 2327 | |
| 2328 | #if defined(PNG_pHYs_SUPPORTED) |
| 2329 | extern PNG_EXPORT(void,png_set_pHYs) PNGARG((png_structp png_ptr, |
| 2330 | png_infop info_ptr, png_uint_32 res_x, png_uint_32 res_y, int unit_type)); |
| 2331 | #endif |
| 2332 | |
| 2333 | extern PNG_EXPORT(png_uint_32,png_get_PLTE) PNGARG((png_structp png_ptr, |
| 2334 | png_infop info_ptr, png_colorp *palette, int *num_palette)); |
| 2335 | |
| 2336 | extern PNG_EXPORT(void,png_set_PLTE) PNGARG((png_structp png_ptr, |
| 2337 | png_infop info_ptr, png_colorp palette, int num_palette)); |
| 2338 | |
| 2339 | #if defined(PNG_sBIT_SUPPORTED) |
| 2340 | extern PNG_EXPORT(png_uint_32,png_get_sBIT) PNGARG((png_structp png_ptr, |
| 2341 | png_infop info_ptr, png_color_8p *sig_bit)); |
| 2342 | #endif |
| 2343 | |
| 2344 | #if defined(PNG_sBIT_SUPPORTED) |
| 2345 | extern PNG_EXPORT(void,png_set_sBIT) PNGARG((png_structp png_ptr, |
| 2346 | png_infop info_ptr, png_color_8p sig_bit)); |
| 2347 | #endif |
| 2348 | |
| 2349 | #if defined(PNG_sRGB_SUPPORTED) |
| 2350 | extern PNG_EXPORT(png_uint_32,png_get_sRGB) PNGARG((png_structp png_ptr, |
| 2351 | png_infop info_ptr, int *intent)); |
| 2352 | #endif |
| 2353 | |
| 2354 | #if defined(PNG_sRGB_SUPPORTED) |
| 2355 | extern PNG_EXPORT(void,png_set_sRGB) PNGARG((png_structp png_ptr, |
| 2356 | png_infop info_ptr, int intent)); |
| 2357 | extern PNG_EXPORT(void,png_set_sRGB_gAMA_and_cHRM) PNGARG((png_structp png_ptr, |
| 2358 | png_infop info_ptr, int intent)); |
| 2359 | #endif |
| 2360 | |
| 2361 | #if defined(PNG_iCCP_SUPPORTED) |
| 2362 | extern PNG_EXPORT(png_uint_32,png_get_iCCP) PNGARG((png_structp png_ptr, |
| 2363 | png_infop info_ptr, png_charpp name, int *compression_type, |
| 2364 | png_charpp profile, png_uint_32 *proflen)); |
| 2365 | /* Note to maintainer: profile should be png_bytepp */ |
| 2366 | #endif |
| 2367 | |
| 2368 | #if defined(PNG_iCCP_SUPPORTED) |
| 2369 | extern PNG_EXPORT(void,png_set_iCCP) PNGARG((png_structp png_ptr, |
| 2370 | png_infop info_ptr, png_charp name, int compression_type, |
| 2371 | png_charp profile, png_uint_32 proflen)); |
| 2372 | /* Note to maintainer: profile should be png_bytep */ |
| 2373 | #endif |
| 2374 | |
| 2375 | #if defined(PNG_sPLT_SUPPORTED) |
| 2376 | extern PNG_EXPORT(png_uint_32,png_get_sPLT) PNGARG((png_structp png_ptr, |
| 2377 | png_infop info_ptr, png_sPLT_tpp entries)); |
| 2378 | #endif |
| 2379 | |
| 2380 | #if defined(PNG_sPLT_SUPPORTED) |
| 2381 | extern PNG_EXPORT(void,png_set_sPLT) PNGARG((png_structp png_ptr, |
| 2382 | png_infop info_ptr, png_sPLT_tp entries, int nentries)); |
| 2383 | #endif |
| 2384 | |
| 2385 | #if defined(PNG_TEXT_SUPPORTED) |
| 2386 | /* png_get_text also returns the number of text chunks in *num_text */ |
| 2387 | extern PNG_EXPORT(png_uint_32,png_get_text) PNGARG((png_structp png_ptr, |
| 2388 | png_infop info_ptr, png_textp *text_ptr, int *num_text)); |
| 2389 | #endif |
| 2390 | |
| 2391 | /* |
| 2392 | * Note while png_set_text() will accept a structure whose text, |
| 2393 | * language, and translated keywords are NULL pointers, the structure |
| 2394 | * returned by png_get_text will always contain regular |
| 2395 | * zero-terminated C strings. They might be empty strings but |
| 2396 | * they will never be NULL pointers. |
| 2397 | */ |
| 2398 | |
| 2399 | #if defined(PNG_TEXT_SUPPORTED) |
| 2400 | extern PNG_EXPORT(void,png_set_text) PNGARG((png_structp png_ptr, |
| 2401 | png_infop info_ptr, png_textp text_ptr, int num_text)); |
| 2402 | #endif |
| 2403 | |
| 2404 | #if defined(PNG_tIME_SUPPORTED) |
| 2405 | extern PNG_EXPORT(png_uint_32,png_get_tIME) PNGARG((png_structp png_ptr, |
| 2406 | png_infop info_ptr, png_timep *mod_time)); |
| 2407 | #endif |
| 2408 | |
| 2409 | #if defined(PNG_tIME_SUPPORTED) |
| 2410 | extern PNG_EXPORT(void,png_set_tIME) PNGARG((png_structp png_ptr, |
| 2411 | png_infop info_ptr, png_timep mod_time)); |
| 2412 | #endif |
| 2413 | |
| 2414 | #if defined(PNG_tRNS_SUPPORTED) |
| 2415 | extern PNG_EXPORT(png_uint_32,png_get_tRNS) PNGARG((png_structp png_ptr, |
| 2416 | png_infop info_ptr, png_bytep *trans, int *num_trans, |
| 2417 | png_color_16p *trans_values)); |
| 2418 | #endif |
| 2419 | |
| 2420 | #if defined(PNG_tRNS_SUPPORTED) |
| 2421 | extern PNG_EXPORT(void,png_set_tRNS) PNGARG((png_structp png_ptr, |
| 2422 | png_infop info_ptr, png_bytep trans, int num_trans, |
| 2423 | png_color_16p trans_values)); |
| 2424 | #endif |
| 2425 | |
| 2426 | #if defined(PNG_tRNS_SUPPORTED) |
| 2427 | #endif |
| 2428 | |
| 2429 | #if defined(PNG_sCAL_SUPPORTED) |
| 2430 | #ifdef PNG_FLOATING_POINT_SUPPORTED |
| 2431 | extern PNG_EXPORT(png_uint_32,png_get_sCAL) PNGARG((png_structp png_ptr, |
| 2432 | png_infop info_ptr, int *unit, double *width, double *height)); |
| 2433 | #else |
| 2434 | #ifdef PNG_FIXED_POINT_SUPPORTED |
| 2435 | extern PNG_EXPORT(png_uint_32,png_get_sCAL_s) PNGARG((png_structp png_ptr, |
| 2436 | png_infop info_ptr, int *unit, png_charpp swidth, png_charpp sheight)); |
| 2437 | #endif |
| 2438 | #endif |
| 2439 | #endif /* PNG_sCAL_SUPPORTED */ |
| 2440 | |
| 2441 | #if defined(PNG_sCAL_SUPPORTED) |
| 2442 | #ifdef PNG_FLOATING_POINT_SUPPORTED |
| 2443 | extern PNG_EXPORT(void,png_set_sCAL) PNGARG((png_structp png_ptr, |
| 2444 | png_infop info_ptr, int unit, double width, double height)); |
| 2445 | #else |
| 2446 | #ifdef PNG_FIXED_POINT_SUPPORTED |
| 2447 | extern PNG_EXPORT(void,png_set_sCAL_s) PNGARG((png_structp png_ptr, |
| 2448 | png_infop info_ptr, int unit, png_charp swidth, png_charp sheight)); |
| 2449 | #endif |
| 2450 | #endif |
| 2451 | #endif /* PNG_sCAL_SUPPORTED || PNG_WRITE_sCAL_SUPPORTED */ |
| 2452 | |
| 2453 | #if defined(PNG_UNKNOWN_CHUNKS_SUPPORTED) |
| 2454 | /* provide a list of chunks and how they are to be handled, if the built-in |
| 2455 | handling or default unknown chunk handling is not desired. Any chunks not |
| 2456 | listed will be handled in the default manner. The IHDR and IEND chunks |
| 2457 | must not be listed. |
| 2458 | keep = 0: follow default behaviour |
| 2459 | = 1: do not keep |
| 2460 | = 2: keep only if safe-to-copy |
| 2461 | = 3: keep even if unsafe-to-copy |
| 2462 | */ |
| 2463 | extern PNG_EXPORT(void, png_set_keep_unknown_chunks) PNGARG((png_structp |
| 2464 | png_ptr, int keep, png_bytep chunk_list, int num_chunks)); |
| 2465 | extern PNG_EXPORT(void, png_set_unknown_chunks) PNGARG((png_structp png_ptr, |
| 2466 | png_infop info_ptr, png_unknown_chunkp unknowns, int num_unknowns)); |
| 2467 | extern PNG_EXPORT(void, png_set_unknown_chunk_location) |
| 2468 | PNGARG((png_structp png_ptr, png_infop info_ptr, int chunk, int location)); |
| 2469 | extern PNG_EXPORT(png_uint_32,png_get_unknown_chunks) PNGARG((png_structp |
| 2470 | png_ptr, png_infop info_ptr, png_unknown_chunkpp entries)); |
| 2471 | #endif |
| 2472 | #ifdef PNG_HANDLE_AS_UNKNOWN_SUPPORTED |
| 2473 | PNG_EXPORT(int,png_handle_as_unknown) PNGARG((png_structp png_ptr, png_bytep |
| 2474 | chunk_name)); |
| 2475 | #endif |
| 2476 | |
| 2477 | /* Png_free_data() will turn off the "valid" flag for anything it frees. |
| 2478 | If you need to turn it off for a chunk that your application has freed, |
| 2479 | you can use png_set_invalid(png_ptr, info_ptr, PNG_INFO_CHNK); */ |
| 2480 | extern PNG_EXPORT(void, png_set_invalid) PNGARG((png_structp png_ptr, |
| 2481 | png_infop info_ptr, int mask)); |
| 2482 | |
| 2483 | #if defined(PNG_INFO_IMAGE_SUPPORTED) |
| 2484 | /* The "params" pointer is currently not used and is for future expansion. */ |
| 2485 | extern PNG_EXPORT(void, png_read_png) PNGARG((png_structp png_ptr, |
| 2486 | png_infop info_ptr, |
| 2487 | int transforms, |
| 2488 | png_voidp params)); |
| 2489 | extern PNG_EXPORT(void, png_write_png) PNGARG((png_structp png_ptr, |
| 2490 | png_infop info_ptr, |
| 2491 | int transforms, |
| 2492 | png_voidp params)); |
| 2493 | #endif |
| 2494 | |
| 2495 | /* Define PNG_DEBUG at compile time for debugging information. Higher |
| 2496 | * numbers for PNG_DEBUG mean more debugging information. This has |
| 2497 | * only been added since version 0.95 so it is not implemented throughout |
| 2498 | * libpng yet, but more support will be added as needed. |
| 2499 | */ |
| 2500 | #ifdef PNG_DEBUG |
| 2501 | #if (PNG_DEBUG > 0) |
| 2502 | #if !defined(PNG_DEBUG_FILE) && defined(_MSC_VER) |
| 2503 | #include <crtdbg.h> |
| 2504 | #if (PNG_DEBUG > 1) |
| 2505 | #define png_debug(l,m) _RPT0(_CRT_WARN,m) |
| 2506 | #define png_debug1(l,m,p1) _RPT1(_CRT_WARN,m,p1) |
| 2507 | #define png_debug2(l,m,p1,p2) _RPT2(_CRT_WARN,m,p1,p2) |
| 2508 | #endif |
| 2509 | #else /* PNG_DEBUG_FILE || !_MSC_VER */ |
| 2510 | #ifndef PNG_DEBUG_FILE |
| 2511 | #define PNG_DEBUG_FILE stderr |
| 2512 | #endif /* PNG_DEBUG_FILE */ |
| 2513 | #if (PNG_DEBUG > 1) |
| 2514 | #define png_debug(l,m) \ |
| 2515 | { \ |
| 2516 | int num_tabs=l; \ |
| 2517 | fprintf(PNG_DEBUG_FILE,"%s"m,(num_tabs==1 ? "\t" : \ |
| 2518 | (num_tabs==2 ? "\t\t":(num_tabs>2 ? "\t\t\t":"")))); \ |
| 2519 | } |
| 2520 | #define png_debug1(l,m,p1) \ |
| 2521 | { \ |
| 2522 | int num_tabs=l; \ |
| 2523 | fprintf(PNG_DEBUG_FILE,"%s"m,(num_tabs==1 ? "\t" : \ |
| 2524 | (num_tabs==2 ? "\t\t":(num_tabs>2 ? "\t\t\t":""))),p1); \ |
| 2525 | } |
| 2526 | #define png_debug2(l,m,p1,p2) \ |
| 2527 | { \ |
| 2528 | int num_tabs=l; \ |
| 2529 | fprintf(PNG_DEBUG_FILE,"%s"m,(num_tabs==1 ? "\t" : \ |
| 2530 | (num_tabs==2 ? "\t\t":(num_tabs>2 ? "\t\t\t":""))),p1,p2); \ |
| 2531 | } |
| 2532 | #endif /* (PNG_DEBUG > 1) */ |
| 2533 | #endif /* _MSC_VER */ |
| 2534 | #endif /* (PNG_DEBUG > 0) */ |
| 2535 | #endif /* PNG_DEBUG */ |
| 2536 | #ifndef png_debug |
| 2537 | #define png_debug(l, m) |
| 2538 | #endif |
| 2539 | #ifndef png_debug1 |
| 2540 | #define png_debug1(l, m, p1) |
| 2541 | #endif |
| 2542 | #ifndef png_debug2 |
| 2543 | #define png_debug2(l, m, p1, p2) |
| 2544 | #endif |
| 2545 | |
| 2546 | extern PNG_EXPORT(png_charp,png_get_copyright) PNGARG((png_structp png_ptr)); |
| 2547 | extern PNG_EXPORT(png_charp,png_get_header_ver) PNGARG((png_structp png_ptr)); |
| 2548 | extern PNG_EXPORT(png_charp,png_get_header_version) PNGARG((png_structp png_ptr)); |
| 2549 | extern PNG_EXPORT(png_charp,png_get_libpng_ver) PNGARG((png_structp png_ptr)); |
| 2550 | |
| 2551 | #ifdef PNG_MNG_FEATURES_SUPPORTED |
| 2552 | extern PNG_EXPORT(png_uint_32,png_permit_mng_features) PNGARG((png_structp |
| 2553 | png_ptr, png_uint_32 mng_features_permitted)); |
| 2554 | #endif |
| 2555 | |
| 2556 | /* For use in png_set_keep_unknown, added to version 1.2.6 */ |
| 2557 | #define PNG_HANDLE_CHUNK_AS_DEFAULT 0 |
| 2558 | #define PNG_HANDLE_CHUNK_NEVER 1 |
| 2559 | #define PNG_HANDLE_CHUNK_IF_SAFE 2 |
| 2560 | #define PNG_HANDLE_CHUNK_ALWAYS 3 |
| 2561 | |
| 2562 | /* Added to version 1.2.0 */ |
| 2563 | #if defined(PNG_ASSEMBLER_CODE_SUPPORTED) |
| 2564 | #if defined(PNG_MMX_CODE_SUPPORTED) |
| 2565 | #define PNG_ASM_FLAG_MMX_SUPPORT_COMPILED 0x01 /* not user-settable */ |
| 2566 | #define PNG_ASM_FLAG_MMX_SUPPORT_IN_CPU 0x02 /* not user-settable */ |
| 2567 | #define PNG_ASM_FLAG_MMX_READ_COMBINE_ROW 0x04 |
| 2568 | #define PNG_ASM_FLAG_MMX_READ_INTERLACE 0x08 |
| 2569 | #define PNG_ASM_FLAG_MMX_READ_FILTER_SUB 0x10 |
| 2570 | #define PNG_ASM_FLAG_MMX_READ_FILTER_UP 0x20 |
| 2571 | #define PNG_ASM_FLAG_MMX_READ_FILTER_AVG 0x40 |
| 2572 | #define PNG_ASM_FLAG_MMX_READ_FILTER_PAETH 0x80 |
| 2573 | #define PNG_ASM_FLAGS_INITIALIZED 0x80000000 /* not user-settable */ |
| 2574 | |
| 2575 | #define PNG_MMX_READ_FLAGS ( PNG_ASM_FLAG_MMX_READ_COMBINE_ROW \ |
| 2576 | | PNG_ASM_FLAG_MMX_READ_INTERLACE \ |
| 2577 | | PNG_ASM_FLAG_MMX_READ_FILTER_SUB \ |
| 2578 | | PNG_ASM_FLAG_MMX_READ_FILTER_UP \ |
| 2579 | | PNG_ASM_FLAG_MMX_READ_FILTER_AVG \ |
| 2580 | | PNG_ASM_FLAG_MMX_READ_FILTER_PAETH ) |
| 2581 | #define PNG_MMX_WRITE_FLAGS ( 0 ) |
| 2582 | |
| 2583 | #define PNG_MMX_FLAGS ( PNG_ASM_FLAG_MMX_SUPPORT_COMPILED \ |
| 2584 | | PNG_ASM_FLAG_MMX_SUPPORT_IN_CPU \ |
| 2585 | | PNG_MMX_READ_FLAGS \ |
| 2586 | | PNG_MMX_WRITE_FLAGS ) |
| 2587 | |
| 2588 | #define PNG_SELECT_READ 1 |
| 2589 | #define PNG_SELECT_WRITE 2 |
| 2590 | #endif /* PNG_MMX_CODE_SUPPORTED */ |
| 2591 | |
| 2592 | #if !defined(PNG_1_0_X) |
| 2593 | /* pngget.c */ |
| 2594 | extern PNG_EXPORT(png_uint_32,png_get_mmx_flagmask) |
| 2595 | PNGARG((int flag_select, int *compilerID)); |
| 2596 | |
| 2597 | /* pngget.c */ |
| 2598 | extern PNG_EXPORT(png_uint_32,png_get_asm_flagmask) |
| 2599 | PNGARG((int flag_select)); |
| 2600 | |
| 2601 | /* pngget.c */ |
| 2602 | extern PNG_EXPORT(png_uint_32,png_get_asm_flags) |
| 2603 | PNGARG((png_structp png_ptr)); |
| 2604 | |
| 2605 | /* pngget.c */ |
| 2606 | extern PNG_EXPORT(png_byte,png_get_mmx_bitdepth_threshold) |
| 2607 | PNGARG((png_structp png_ptr)); |
| 2608 | |
| 2609 | /* pngget.c */ |
| 2610 | extern PNG_EXPORT(png_uint_32,png_get_mmx_rowbytes_threshold) |
| 2611 | PNGARG((png_structp png_ptr)); |
| 2612 | |
| 2613 | /* pngset.c */ |
| 2614 | extern PNG_EXPORT(void,png_set_asm_flags) |
| 2615 | PNGARG((png_structp png_ptr, png_uint_32 asm_flags)); |
| 2616 | |
| 2617 | /* pngset.c */ |
| 2618 | extern PNG_EXPORT(void,png_set_mmx_thresholds) |
| 2619 | PNGARG((png_structp png_ptr, png_byte mmx_bitdepth_threshold, |
| 2620 | png_uint_32 mmx_rowbytes_threshold)); |
| 2621 | |
| 2622 | #endif /* PNG_1_0_X */ |
| 2623 | |
| 2624 | #if !defined(PNG_1_0_X) |
| 2625 | /* png.c, pnggccrd.c, or pngvcrd.c */ |
| 2626 | extern PNG_EXPORT(int,png_mmx_support) PNGARG((void)); |
| 2627 | #endif /* PNG_ASSEMBLER_CODE_SUPPORTED */ |
| 2628 | |
| 2629 | /* Strip the prepended error numbers ("#nnn ") from error and warning |
| 2630 | * messages before passing them to the error or warning handler. */ |
| 2631 | #ifdef PNG_ERROR_NUMBERS_SUPPORTED |
| 2632 | extern PNG_EXPORT(void,png_set_strip_error_numbers) PNGARG((png_structp |
| 2633 | png_ptr, png_uint_32 strip_mode)); |
| 2634 | #endif |
| 2635 | |
| 2636 | #endif /* PNG_1_0_X */ |
| 2637 | |
| 2638 | /* Added at libpng-1.2.6 */ |
| 2639 | #ifdef PNG_SET_USER_LIMITS_SUPPORTED |
| 2640 | extern PNG_EXPORT(void,png_set_user_limits) PNGARG((png_structp |
| 2641 | png_ptr, png_uint_32 user_width_max, png_uint_32 user_height_max)); |
| 2642 | extern PNG_EXPORT(png_uint_32,png_get_user_width_max) PNGARG((png_structp |
| 2643 | png_ptr)); |
| 2644 | extern PNG_EXPORT(png_uint_32,png_get_user_height_max) PNGARG((png_structp |
| 2645 | png_ptr)); |
| 2646 | #endif |
| 2647 | |
| 2648 | /* Maintainer: Put new public prototypes here ^, in libpng.3, and project defs */ |
| 2649 | |
| 2650 | #ifdef PNG_READ_COMPOSITE_NODIV_SUPPORTED |
| 2651 | /* With these routines we avoid an integer divide, which will be slower on |
| 2652 | * most machines. However, it does take more operations than the corresponding |
| 2653 | * divide method, so it may be slower on a few RISC systems. There are two |
| 2654 | * shifts (by 8 or 16 bits) and an addition, versus a single integer divide. |
| 2655 | * |
| 2656 | * Note that the rounding factors are NOT supposed to be the same! 128 and |
| 2657 | * 32768 are correct for the NODIV code; 127 and 32767 are correct for the |
| 2658 | * standard method. |
| 2659 | * |
| 2660 | * [Optimized code by Greg Roelofs and Mark Adler...blame us for bugs. :-) ] |
| 2661 | */ |
| 2662 | |
| 2663 | /* fg and bg should be in `gamma 1.0' space; alpha is the opacity */ |
| 2664 | |
| 2665 | # define png_composite(composite, fg, alpha, bg) \ |
| 2666 | { png_uint_16 temp = (png_uint_16)((png_uint_16)(fg) * (png_uint_16)(alpha) \ |
| 2667 | + (png_uint_16)(bg)*(png_uint_16)(255 - \ |
| 2668 | (png_uint_16)(alpha)) + (png_uint_16)128); \ |
| 2669 | (composite) = (png_byte)((temp + (temp >> 8)) >> 8); } |
| 2670 | |
| 2671 | # define png_composite_16(composite, fg, alpha, bg) \ |
| 2672 | { png_uint_32 temp = (png_uint_32)((png_uint_32)(fg) * (png_uint_32)(alpha) \ |
| 2673 | + (png_uint_32)(bg)*(png_uint_32)(65535L - \ |
| 2674 | (png_uint_32)(alpha)) + (png_uint_32)32768L); \ |
| 2675 | (composite) = (png_uint_16)((temp + (temp >> 16)) >> 16); } |
| 2676 | |
| 2677 | #else /* standard method using integer division */ |
| 2678 | |
| 2679 | # define png_composite(composite, fg, alpha, bg) \ |
| 2680 | (composite) = (png_byte)(((png_uint_16)(fg) * (png_uint_16)(alpha) + \ |
| 2681 | (png_uint_16)(bg) * (png_uint_16)(255 - (png_uint_16)(alpha)) + \ |
| 2682 | (png_uint_16)127) / 255) |
| 2683 | |
| 2684 | # define png_composite_16(composite, fg, alpha, bg) \ |
| 2685 | (composite) = (png_uint_16)(((png_uint_32)(fg) * (png_uint_32)(alpha) + \ |
| 2686 | (png_uint_32)(bg)*(png_uint_32)(65535L - (png_uint_32)(alpha)) + \ |
| 2687 | (png_uint_32)32767) / (png_uint_32)65535L) |
| 2688 | |
| 2689 | #endif /* PNG_READ_COMPOSITE_NODIV_SUPPORTED */ |
| 2690 | |
| 2691 | /* Inline macros to do direct reads of bytes from the input buffer. These |
| 2692 | * require that you are using an architecture that uses PNG byte ordering |
| 2693 | * (MSB first) and supports unaligned data storage. I think that PowerPC |
| 2694 | * in big-endian mode and 680x0 are the only ones that will support this. |
| 2695 | * The x86 line of processors definitely do not. The png_get_int_32() |
| 2696 | * routine also assumes we are using two's complement format for negative |
| 2697 | * values, which is almost certainly true. |
| 2698 | */ |
| 2699 | #if defined(PNG_READ_BIG_ENDIAN_SUPPORTED) |
| 2700 | # define png_get_uint_32(buf) ( *((png_uint_32p) (buf))) |
| 2701 | # define png_get_uint_16(buf) ( *((png_uint_16p) (buf))) |
| 2702 | # define png_get_int_32(buf) ( *((png_int_32p) (buf))) |
| 2703 | #else |
| 2704 | extern PNG_EXPORT(png_uint_32,png_get_uint_32) PNGARG((png_bytep buf)); |
| 2705 | extern PNG_EXPORT(png_uint_16,png_get_uint_16) PNGARG((png_bytep buf)); |
| 2706 | extern PNG_EXPORT(png_int_32,png_get_int_32) PNGARG((png_bytep buf)); |
| 2707 | #endif /* !PNG_READ_BIG_ENDIAN_SUPPORTED */ |
| 2708 | extern PNG_EXPORT(png_uint_32,png_get_uint_31) |
| 2709 | PNGARG((png_structp png_ptr, png_bytep buf)); |
| 2710 | /* No png_get_int_16 -- may be added if there's a real need for it. */ |
| 2711 | |
| 2712 | /* Place a 32-bit number into a buffer in PNG byte order (big-endian). |
| 2713 | */ |
| 2714 | extern PNG_EXPORT(void,png_save_uint_32) |
| 2715 | PNGARG((png_bytep buf, png_uint_32 i)); |
| 2716 | extern PNG_EXPORT(void,png_save_int_32) |
| 2717 | PNGARG((png_bytep buf, png_int_32 i)); |
| 2718 | |
| 2719 | /* Place a 16-bit number into a buffer in PNG byte order. |
| 2720 | * The parameter is declared unsigned int, not png_uint_16, |
| 2721 | * just to avoid potential problems on pre-ANSI C compilers. |
| 2722 | */ |
| 2723 | extern PNG_EXPORT(void,png_save_uint_16) |
| 2724 | PNGARG((png_bytep buf, unsigned int i)); |
| 2725 | /* No png_save_int_16 -- may be added if there's a real need for it. */ |
| 2726 | |
| 2727 | /* ************************************************************************* */ |
| 2728 | |
| 2729 | /* These next functions are used internally in the code. They generally |
| 2730 | * shouldn't be used unless you are writing code to add or replace some |
| 2731 | * functionality in libpng. More information about most functions can |
| 2732 | * be found in the files where the functions are located. |
| 2733 | */ |
| 2734 | |
| 2735 | |
| 2736 | /* Various modes of operation, that are visible to applications because |
| 2737 | * they are used for unknown chunk location. |
| 2738 | */ |
| 2739 | #define PNG_HAVE_IHDR 0x01 |
| 2740 | #define PNG_HAVE_PLTE 0x02 |
| 2741 | #define PNG_HAVE_IDAT 0x04 |
| 2742 | #define PNG_AFTER_IDAT 0x08 /* Have complete zlib datastream */ |
| 2743 | #define PNG_HAVE_IEND 0x10 |
| 2744 | |
| 2745 | #if defined(PNG_INTERNAL) |
| 2746 | |
| 2747 | /* More modes of operation. Note that after an init, mode is set to |
| 2748 | * zero automatically when the structure is created. |
| 2749 | */ |
| 2750 | #define PNG_HAVE_gAMA 0x20 |
| 2751 | #define PNG_HAVE_cHRM 0x40 |
| 2752 | #define PNG_HAVE_sRGB 0x80 |
| 2753 | #define PNG_HAVE_CHUNK_HEADER 0x100 |
| 2754 | #define PNG_WROTE_tIME 0x200 |
| 2755 | #define PNG_WROTE_INFO_BEFORE_PLTE 0x400 |
| 2756 | #define PNG_BACKGROUND_IS_GRAY 0x800 |
| 2757 | #define PNG_HAVE_PNG_SIGNATURE 0x1000 |
| 2758 | #define PNG_HAVE_CHUNK_AFTER_IDAT 0x2000 /* Have another chunk after IDAT */ |
| 2759 | |
| 2760 | /* flags for the transformations the PNG library does on the image data */ |
| 2761 | #define PNG_BGR 0x0001 |
| 2762 | #define PNG_INTERLACE 0x0002 |
| 2763 | #define PNG_PACK 0x0004 |
| 2764 | #define PNG_SHIFT 0x0008 |
| 2765 | #define PNG_SWAP_BYTES 0x0010 |
| 2766 | #define PNG_INVERT_MONO 0x0020 |
| 2767 | #define PNG_DITHER 0x0040 |
| 2768 | #define PNG_BACKGROUND 0x0080 |
| 2769 | #define PNG_BACKGROUND_EXPAND 0x0100 |
| 2770 | /* 0x0200 unused */ |
| 2771 | #define PNG_16_TO_8 0x0400 |
| 2772 | #define PNG_RGBA 0x0800 |
| 2773 | #define PNG_EXPAND 0x1000 |
| 2774 | #define PNG_GAMMA 0x2000 |
| 2775 | #define PNG_GRAY_TO_RGB 0x4000 |
| 2776 | #define PNG_FILLER 0x8000L |
| 2777 | #define PNG_PACKSWAP 0x10000L |
| 2778 | #define PNG_SWAP_ALPHA 0x20000L |
| 2779 | #define PNG_STRIP_ALPHA 0x40000L |
| 2780 | #define PNG_INVERT_ALPHA 0x80000L |
| 2781 | #define PNG_USER_TRANSFORM 0x100000L |
| 2782 | #define PNG_RGB_TO_GRAY_ERR 0x200000L |
| 2783 | #define PNG_RGB_TO_GRAY_WARN 0x400000L |
| 2784 | #define PNG_RGB_TO_GRAY 0x600000L /* two bits, RGB_TO_GRAY_ERR|WARN */ |
| 2785 | /* 0x800000L Unused */ |
| 2786 | #define PNG_ADD_ALPHA 0x1000000L /* Added to libpng-1.2.7 */ |
| 2787 | #define PNG_EXPAND_tRNS 0x2000000L /* Added to libpng-1.2.9 */ |
| 2788 | /* 0x4000000L unused */ |
| 2789 | /* 0x8000000L unused */ |
| 2790 | /* 0x10000000L unused */ |
| 2791 | /* 0x20000000L unused */ |
| 2792 | /* 0x40000000L unused */ |
| 2793 | |
| 2794 | /* flags for png_create_struct */ |
| 2795 | #define PNG_STRUCT_PNG 0x0001 |
| 2796 | #define PNG_STRUCT_INFO 0x0002 |
| 2797 | |
| 2798 | /* Scaling factor for filter heuristic weighting calculations */ |
| 2799 | #define PNG_WEIGHT_SHIFT 8 |
| 2800 | #define PNG_WEIGHT_FACTOR (1<<(PNG_WEIGHT_SHIFT)) |
| 2801 | #define PNG_COST_SHIFT 3 |
| 2802 | #define PNG_COST_FACTOR (1<<(PNG_COST_SHIFT)) |
| 2803 | |
| 2804 | /* flags for the png_ptr->flags rather than declaring a byte for each one */ |
| 2805 | #define PNG_FLAG_ZLIB_CUSTOM_STRATEGY 0x0001 |
| 2806 | #define PNG_FLAG_ZLIB_CUSTOM_LEVEL 0x0002 |
| 2807 | #define PNG_FLAG_ZLIB_CUSTOM_MEM_LEVEL 0x0004 |
| 2808 | #define PNG_FLAG_ZLIB_CUSTOM_WINDOW_BITS 0x0008 |
| 2809 | #define PNG_FLAG_ZLIB_CUSTOM_METHOD 0x0010 |
| 2810 | #define PNG_FLAG_ZLIB_FINISHED 0x0020 |
| 2811 | #define PNG_FLAG_ROW_INIT 0x0040 |
| 2812 | #define PNG_FLAG_FILLER_AFTER 0x0080 |
| 2813 | #define PNG_FLAG_CRC_ANCILLARY_USE 0x0100 |
| 2814 | #define PNG_FLAG_CRC_ANCILLARY_NOWARN 0x0200 |
| 2815 | #define PNG_FLAG_CRC_CRITICAL_USE 0x0400 |
| 2816 | #define PNG_FLAG_CRC_CRITICAL_IGNORE 0x0800 |
| 2817 | #define PNG_FLAG_FREE_PLTE 0x1000 |
| 2818 | #define PNG_FLAG_FREE_TRNS 0x2000 |
| 2819 | #define PNG_FLAG_FREE_HIST 0x4000 |
| 2820 | #define PNG_FLAG_KEEP_UNKNOWN_CHUNKS 0x8000L |
| 2821 | #define PNG_FLAG_KEEP_UNSAFE_CHUNKS 0x10000L |
| 2822 | #define PNG_FLAG_LIBRARY_MISMATCH 0x20000L |
| 2823 | #define PNG_FLAG_STRIP_ERROR_NUMBERS 0x40000L |
| 2824 | #define PNG_FLAG_STRIP_ERROR_TEXT 0x80000L |
| 2825 | #define PNG_FLAG_MALLOC_NULL_MEM_OK 0x100000L |
| 2826 | #define PNG_FLAG_ADD_ALPHA 0x200000L /* Added to libpng-1.2.8 */ |
| 2827 | #define PNG_FLAG_STRIP_ALPHA 0x400000L /* Added to libpng-1.2.8 */ |
| 2828 | /* 0x800000L unused */ |
| 2829 | /* 0x1000000L unused */ |
| 2830 | /* 0x2000000L unused */ |
| 2831 | /* 0x4000000L unused */ |
| 2832 | /* 0x8000000L unused */ |
| 2833 | /* 0x10000000L unused */ |
| 2834 | /* 0x20000000L unused */ |
| 2835 | /* 0x40000000L unused */ |
| 2836 | |
| 2837 | #define PNG_FLAG_CRC_ANCILLARY_MASK (PNG_FLAG_CRC_ANCILLARY_USE | \ |
| 2838 | PNG_FLAG_CRC_ANCILLARY_NOWARN) |
| 2839 | |
| 2840 | #define PNG_FLAG_CRC_CRITICAL_MASK (PNG_FLAG_CRC_CRITICAL_USE | \ |
| 2841 | PNG_FLAG_CRC_CRITICAL_IGNORE) |
| 2842 | |
| 2843 | #define PNG_FLAG_CRC_MASK (PNG_FLAG_CRC_ANCILLARY_MASK | \ |
| 2844 | PNG_FLAG_CRC_CRITICAL_MASK) |
| 2845 | |
| 2846 | /* save typing and make code easier to understand */ |
| 2847 | |
| 2848 | #define PNG_COLOR_DIST(c1, c2) (abs((int)((c1).red) - (int)((c2).red)) + \ |
| 2849 | abs((int)((c1).green) - (int)((c2).green)) + \ |
| 2850 | abs((int)((c1).blue) - (int)((c2).blue))) |
| 2851 | |
| 2852 | /* Added to libpng-1.2.6 JB */ |
| 2853 | #define PNG_ROWBYTES(pixel_bits, width) \ |
| 2854 | ((pixel_bits) >= 8 ? \ |
| 2855 | ((width) * (((png_uint_32)(pixel_bits)) >> 3)) : \ |
| 2856 | (( ((width) * ((png_uint_32)(pixel_bits))) + 7) >> 3) ) |
| 2857 | |
| 2858 | /* PNG_OUT_OF_RANGE returns true if value is outside the range |
| 2859 | ideal-delta..ideal+delta. Each argument is evaluated twice. |
| 2860 | "ideal" and "delta" should be constants, normally simple |
| 2861 | integers, "value" a variable. Added to libpng-1.2.6 JB */ |
| 2862 | #define PNG_OUT_OF_RANGE(value, ideal, delta) \ |
| 2863 | ( (value) < (ideal)-(delta) || (value) > (ideal)+(delta) ) |
| 2864 | |
| 2865 | /* variables declared in png.c - only it needs to define PNG_NO_EXTERN */ |
| 2866 | #if !defined(PNG_NO_EXTERN) || defined(PNG_ALWAYS_EXTERN) |
| 2867 | /* place to hold the signature string for a PNG file. */ |
| 2868 | #ifdef PNG_USE_GLOBAL_ARRAYS |
| 2869 | PNG_EXPORT_VAR (PNG_CONST png_byte FARDATA) png_sig[8]; |
| 2870 | #else |
| 2871 | #endif |
| 2872 | #endif /* PNG_NO_EXTERN */ |
| 2873 | |
| 2874 | /* Constant strings for known chunk types. If you need to add a chunk, |
| 2875 | * define the name here, and add an invocation of the macro in png.c and |
| 2876 | * wherever it's needed. |
| 2877 | */ |
| 2878 | #define PNG_IHDR png_byte png_IHDR[5] = { 73, 72, 68, 82, '\0'} |
| 2879 | #define PNG_IDAT png_byte png_IDAT[5] = { 73, 68, 65, 84, '\0'} |
| 2880 | #define PNG_IEND png_byte png_IEND[5] = { 73, 69, 78, 68, '\0'} |
| 2881 | #define PNG_PLTE png_byte png_PLTE[5] = { 80, 76, 84, 69, '\0'} |
| 2882 | #define PNG_bKGD png_byte png_bKGD[5] = { 98, 75, 71, 68, '\0'} |
| 2883 | #define PNG_cHRM png_byte png_cHRM[5] = { 99, 72, 82, 77, '\0'} |
| 2884 | #define PNG_gAMA png_byte png_gAMA[5] = {103, 65, 77, 65, '\0'} |
| 2885 | #define PNG_hIST png_byte png_hIST[5] = {104, 73, 83, 84, '\0'} |
| 2886 | #define PNG_iCCP png_byte png_iCCP[5] = {105, 67, 67, 80, '\0'} |
| 2887 | #define PNG_iTXt png_byte png_iTXt[5] = {105, 84, 88, 116, '\0'} |
| 2888 | #define PNG_oFFs png_byte png_oFFs[5] = {111, 70, 70, 115, '\0'} |
| 2889 | #define PNG_pCAL png_byte png_pCAL[5] = {112, 67, 65, 76, '\0'} |
| 2890 | #define PNG_sCAL png_byte png_sCAL[5] = {115, 67, 65, 76, '\0'} |
| 2891 | #define PNG_pHYs png_byte png_pHYs[5] = {112, 72, 89, 115, '\0'} |
| 2892 | #define PNG_sBIT png_byte png_sBIT[5] = {115, 66, 73, 84, '\0'} |
| 2893 | #define PNG_sPLT png_byte png_sPLT[5] = {115, 80, 76, 84, '\0'} |
| 2894 | #define PNG_sRGB png_byte png_sRGB[5] = {115, 82, 71, 66, '\0'} |
| 2895 | #define PNG_tEXt png_byte png_tEXt[5] = {116, 69, 88, 116, '\0'} |
| 2896 | #define PNG_tIME png_byte png_tIME[5] = {116, 73, 77, 69, '\0'} |
| 2897 | #define PNG_tRNS png_byte png_tRNS[5] = {116, 82, 78, 83, '\0'} |
| 2898 | #define PNG_zTXt png_byte png_zTXt[5] = {122, 84, 88, 116, '\0'} |
| 2899 | |
| 2900 | #ifdef PNG_USE_GLOBAL_ARRAYS |
| 2901 | PNG_EXPORT_VAR (png_byte FARDATA) png_IHDR[5]; |
| 2902 | PNG_EXPORT_VAR (png_byte FARDATA) png_IDAT[5]; |
| 2903 | PNG_EXPORT_VAR (png_byte FARDATA) png_IEND[5]; |
| 2904 | PNG_EXPORT_VAR (png_byte FARDATA) png_PLTE[5]; |
| 2905 | PNG_EXPORT_VAR (png_byte FARDATA) png_bKGD[5]; |
| 2906 | PNG_EXPORT_VAR (png_byte FARDATA) png_cHRM[5]; |
| 2907 | PNG_EXPORT_VAR (png_byte FARDATA) png_gAMA[5]; |
| 2908 | PNG_EXPORT_VAR (png_byte FARDATA) png_hIST[5]; |
| 2909 | PNG_EXPORT_VAR (png_byte FARDATA) png_iCCP[5]; |
| 2910 | PNG_EXPORT_VAR (png_byte FARDATA) png_iTXt[5]; |
| 2911 | PNG_EXPORT_VAR (png_byte FARDATA) png_oFFs[5]; |
| 2912 | PNG_EXPORT_VAR (png_byte FARDATA) png_pCAL[5]; |
| 2913 | PNG_EXPORT_VAR (png_byte FARDATA) png_sCAL[5]; |
| 2914 | PNG_EXPORT_VAR (png_byte FARDATA) png_pHYs[5]; |
| 2915 | PNG_EXPORT_VAR (png_byte FARDATA) png_sBIT[5]; |
| 2916 | PNG_EXPORT_VAR (png_byte FARDATA) png_sPLT[5]; |
| 2917 | PNG_EXPORT_VAR (png_byte FARDATA) png_sRGB[5]; |
| 2918 | PNG_EXPORT_VAR (png_byte FARDATA) png_tEXt[5]; |
| 2919 | PNG_EXPORT_VAR (png_byte FARDATA) png_tIME[5]; |
| 2920 | PNG_EXPORT_VAR (png_byte FARDATA) png_tRNS[5]; |
| 2921 | PNG_EXPORT_VAR (png_byte FARDATA) png_zTXt[5]; |
| 2922 | #endif /* PNG_USE_GLOBAL_ARRAYS */ |
| 2923 | |
| 2924 | #if defined(PNG_1_0_X) || defined (PNG_1_2_X) |
| 2925 | /* Initialize png_ptr struct for reading, and allocate any other memory. |
| 2926 | * (old interface - DEPRECATED - use png_create_read_struct instead). |
| 2927 | */ |
| 2928 | extern PNG_EXPORT(void,png_read_init) PNGARG((png_structp png_ptr)); |
| 2929 | #undef png_read_init |
| 2930 | #define png_read_init(png_ptr) png_read_init_3(&png_ptr, \ |
| 2931 | PNG_LIBPNG_VER_STRING, png_sizeof(png_struct)); |
| 2932 | #endif |
| 2933 | |
| 2934 | extern PNG_EXPORT(void,png_read_init_3) PNGARG((png_structpp ptr_ptr, |
| 2935 | png_const_charp user_png_ver, png_size_t png_struct_size)); |
| 2936 | #if defined(PNG_1_0_X) || defined (PNG_1_2_X) |
| 2937 | extern PNG_EXPORT(void,png_read_init_2) PNGARG((png_structp png_ptr, |
| 2938 | png_const_charp user_png_ver, png_size_t png_struct_size, png_size_t |
| 2939 | png_info_size)); |
| 2940 | #endif |
| 2941 | |
| 2942 | #if defined(PNG_1_0_X) || defined (PNG_1_2_X) |
| 2943 | /* Initialize png_ptr struct for writing, and allocate any other memory. |
| 2944 | * (old interface - DEPRECATED - use png_create_write_struct instead). |
| 2945 | */ |
| 2946 | extern PNG_EXPORT(void,png_write_init) PNGARG((png_structp png_ptr)); |
| 2947 | #undef png_write_init |
| 2948 | #define png_write_init(png_ptr) png_write_init_3(&png_ptr, \ |
| 2949 | PNG_LIBPNG_VER_STRING, png_sizeof(png_struct)); |
| 2950 | #endif |
| 2951 | |
| 2952 | extern PNG_EXPORT(void,png_write_init_3) PNGARG((png_structpp ptr_ptr, |
| 2953 | png_const_charp user_png_ver, png_size_t png_struct_size)); |
| 2954 | extern PNG_EXPORT(void,png_write_init_2) PNGARG((png_structp png_ptr, |
| 2955 | png_const_charp user_png_ver, png_size_t png_struct_size, png_size_t |
| 2956 | png_info_size)); |
| 2957 | |
| 2958 | /* Allocate memory for an internal libpng struct */ |
| 2959 | PNG_EXTERN png_voidp png_create_struct PNGARG((int type)); |
| 2960 | |
| 2961 | /* Free memory from internal libpng struct */ |
| 2962 | PNG_EXTERN void png_destroy_struct PNGARG((png_voidp struct_ptr)); |
| 2963 | |
| 2964 | PNG_EXTERN png_voidp png_create_struct_2 PNGARG((int type, png_malloc_ptr |
| 2965 | malloc_fn, png_voidp mem_ptr)); |
| 2966 | PNG_EXTERN void png_destroy_struct_2 PNGARG((png_voidp struct_ptr, |
| 2967 | png_free_ptr free_fn, png_voidp mem_ptr)); |
| 2968 | |
| 2969 | /* Free any memory that info_ptr points to and reset struct. */ |
| 2970 | PNG_EXTERN void png_info_destroy PNGARG((png_structp png_ptr, |
| 2971 | png_infop info_ptr)); |
| 2972 | |
| 2973 | #ifndef PNG_1_0_X |
| 2974 | /* Function to allocate memory for zlib. */ |
| 2975 | PNG_EXTERN voidpf png_zalloc PNGARG((voidpf png_ptr, uInt items, uInt size)); |
| 2976 | |
| 2977 | /* Function to free memory for zlib */ |
| 2978 | PNG_EXTERN void png_zfree PNGARG((voidpf png_ptr, voidpf ptr)); |
| 2979 | |
| 2980 | #ifdef PNG_SIZE_T |
| 2981 | /* Function to convert a sizeof an item to png_sizeof item */ |
| 2982 | PNG_EXTERN png_size_t PNGAPI png_convert_size PNGARG((size_t size)); |
| 2983 | #endif |
| 2984 | |
| 2985 | /* Next four functions are used internally as callbacks. PNGAPI is required |
| 2986 | * but not PNG_EXPORT. PNGAPI added at libpng version 1.2.3. */ |
| 2987 | |
| 2988 | PNG_EXTERN void PNGAPI png_default_read_data PNGARG((png_structp png_ptr, |
| 2989 | png_bytep data, png_size_t length)); |
| 2990 | |
| 2991 | #ifdef PNG_PROGRESSIVE_READ_SUPPORTED |
| 2992 | PNG_EXTERN void PNGAPI png_push_fill_buffer PNGARG((png_structp png_ptr, |
| 2993 | png_bytep buffer, png_size_t length)); |
| 2994 | #endif |
| 2995 | |
| 2996 | PNG_EXTERN void PNGAPI png_default_write_data PNGARG((png_structp png_ptr, |
| 2997 | png_bytep data, png_size_t length)); |
| 2998 | |
| 2999 | #if defined(PNG_WRITE_FLUSH_SUPPORTED) |
| 3000 | #if !defined(PNG_NO_STDIO) |
| 3001 | PNG_EXTERN void PNGAPI png_default_flush PNGARG((png_structp png_ptr)); |
| 3002 | #endif |
| 3003 | #endif |
| 3004 | #else /* PNG_1_0_X */ |
| 3005 | #ifdef PNG_PROGRESSIVE_READ_SUPPORTED |
| 3006 | PNG_EXTERN void png_push_fill_buffer PNGARG((png_structp png_ptr, |
| 3007 | png_bytep buffer, png_size_t length)); |
| 3008 | #endif |
| 3009 | #endif /* PNG_1_0_X */ |
| 3010 | |
| 3011 | /* Reset the CRC variable */ |
| 3012 | PNG_EXTERN void png_reset_crc PNGARG((png_structp png_ptr)); |
| 3013 | |
| 3014 | /* Write the "data" buffer to whatever output you are using. */ |
| 3015 | PNG_EXTERN void png_write_data PNGARG((png_structp png_ptr, png_bytep data, |
| 3016 | png_size_t length)); |
| 3017 | |
| 3018 | /* Read data from whatever input you are using into the "data" buffer */ |
| 3019 | PNG_EXTERN void png_read_data PNGARG((png_structp png_ptr, png_bytep data, |
| 3020 | png_size_t length)); |
| 3021 | |
| 3022 | /* Read bytes into buf, and update png_ptr->crc */ |
| 3023 | PNG_EXTERN void png_crc_read PNGARG((png_structp png_ptr, png_bytep buf, |
| 3024 | png_size_t length)); |
| 3025 | |
| 3026 | /* Decompress data in a chunk that uses compression */ |
| 3027 | #if defined(PNG_zTXt_SUPPORTED) || defined(PNG_iTXt_SUPPORTED) || \ |
| 3028 | defined(PNG_iCCP_SUPPORTED) || defined(PNG_sPLT_SUPPORTED) |
| 3029 | PNG_EXTERN png_charp png_decompress_chunk PNGARG((png_structp png_ptr, |
| 3030 | int comp_type, png_charp chunkdata, png_size_t chunklength, |
| 3031 | png_size_t prefix_length, png_size_t *data_length)); |
| 3032 | #endif |
| 3033 | |
| 3034 | /* Read "skip" bytes, read the file crc, and (optionally) verify png_ptr->crc */ |
| 3035 | PNG_EXTERN int png_crc_finish PNGARG((png_structp png_ptr, png_uint_32 skip)); |
| 3036 | |
| 3037 | /* Read the CRC from the file and compare it to the libpng calculated CRC */ |
| 3038 | PNG_EXTERN int png_crc_error PNGARG((png_structp png_ptr)); |
| 3039 | |
| 3040 | /* Calculate the CRC over a section of data. Note that we are only |
| 3041 | * passing a maximum of 64K on systems that have this as a memory limit, |
| 3042 | * since this is the maximum buffer size we can specify. |
| 3043 | */ |
| 3044 | PNG_EXTERN void png_calculate_crc PNGARG((png_structp png_ptr, png_bytep ptr, |
| 3045 | png_size_t length)); |
| 3046 | |
| 3047 | #if defined(PNG_WRITE_FLUSH_SUPPORTED) |
| 3048 | PNG_EXTERN void png_flush PNGARG((png_structp png_ptr)); |
| 3049 | #endif |
| 3050 | |
| 3051 | /* simple function to write the signature */ |
| 3052 | PNG_EXTERN void png_write_sig PNGARG((png_structp png_ptr)); |
| 3053 | |
| 3054 | /* write various chunks */ |
| 3055 | |
| 3056 | /* Write the IHDR chunk, and update the png_struct with the necessary |
| 3057 | * information. |
| 3058 | */ |
| 3059 | PNG_EXTERN void png_write_IHDR PNGARG((png_structp png_ptr, png_uint_32 width, |
| 3060 | png_uint_32 height, |
| 3061 | int bit_depth, int color_type, int compression_method, int filter_method, |
| 3062 | int interlace_method)); |
| 3063 | |
| 3064 | PNG_EXTERN void png_write_PLTE PNGARG((png_structp png_ptr, png_colorp palette, |
| 3065 | png_uint_32 num_pal)); |
| 3066 | |
| 3067 | PNG_EXTERN void png_write_IDAT PNGARG((png_structp png_ptr, png_bytep data, |
| 3068 | png_size_t length)); |
| 3069 | |
| 3070 | PNG_EXTERN void png_write_IEND PNGARG((png_structp png_ptr)); |
| 3071 | |
| 3072 | #if defined(PNG_WRITE_gAMA_SUPPORTED) |
| 3073 | #ifdef PNG_FLOATING_POINT_SUPPORTED |
| 3074 | PNG_EXTERN void png_write_gAMA PNGARG((png_structp png_ptr, double file_gamma)); |
| 3075 | #endif |
| 3076 | #ifdef PNG_FIXED_POINT_SUPPORTED |
| 3077 | PNG_EXTERN void png_write_gAMA_fixed PNGARG((png_structp png_ptr, png_fixed_point |
| 3078 | file_gamma)); |
| 3079 | #endif |
| 3080 | #endif |
| 3081 | |
| 3082 | #if defined(PNG_WRITE_sBIT_SUPPORTED) |
| 3083 | PNG_EXTERN void png_write_sBIT PNGARG((png_structp png_ptr, png_color_8p sbit, |
| 3084 | int color_type)); |
| 3085 | #endif |
| 3086 | |
| 3087 | #if defined(PNG_WRITE_cHRM_SUPPORTED) |
| 3088 | #ifdef PNG_FLOATING_POINT_SUPPORTED |
| 3089 | PNG_EXTERN void png_write_cHRM PNGARG((png_structp png_ptr, |
| 3090 | double white_x, double white_y, |
| 3091 | double red_x, double red_y, double green_x, double green_y, |
| 3092 | double blue_x, double blue_y)); |
| 3093 | #endif |
| 3094 | #ifdef PNG_FIXED_POINT_SUPPORTED |
| 3095 | PNG_EXTERN void png_write_cHRM_fixed PNGARG((png_structp png_ptr, |
| 3096 | png_fixed_point int_white_x, png_fixed_point int_white_y, |
| 3097 | png_fixed_point int_red_x, png_fixed_point int_red_y, png_fixed_point |
| 3098 | int_green_x, png_fixed_point int_green_y, png_fixed_point int_blue_x, |
| 3099 | png_fixed_point int_blue_y)); |
| 3100 | #endif |
| 3101 | #endif |
| 3102 | |
| 3103 | #if defined(PNG_WRITE_sRGB_SUPPORTED) |
| 3104 | PNG_EXTERN void png_write_sRGB PNGARG((png_structp png_ptr, |
| 3105 | int intent)); |
| 3106 | #endif |
| 3107 | |
| 3108 | #if defined(PNG_WRITE_iCCP_SUPPORTED) |
| 3109 | PNG_EXTERN void png_write_iCCP PNGARG((png_structp png_ptr, |
| 3110 | png_charp name, int compression_type, |
| 3111 | png_charp profile, int proflen)); |
| 3112 | /* Note to maintainer: profile should be png_bytep */ |
| 3113 | #endif |
| 3114 | |
| 3115 | #if defined(PNG_WRITE_sPLT_SUPPORTED) |
| 3116 | PNG_EXTERN void png_write_sPLT PNGARG((png_structp png_ptr, |
| 3117 | png_sPLT_tp palette)); |
| 3118 | #endif |
| 3119 | |
| 3120 | #if defined(PNG_WRITE_tRNS_SUPPORTED) |
| 3121 | PNG_EXTERN void png_write_tRNS PNGARG((png_structp png_ptr, png_bytep trans, |
| 3122 | png_color_16p values, int number, int color_type)); |
| 3123 | #endif |
| 3124 | |
| 3125 | #if defined(PNG_WRITE_bKGD_SUPPORTED) |
| 3126 | PNG_EXTERN void png_write_bKGD PNGARG((png_structp png_ptr, |
| 3127 | png_color_16p values, int color_type)); |
| 3128 | #endif |
| 3129 | |
| 3130 | #if defined(PNG_WRITE_hIST_SUPPORTED) |
| 3131 | PNG_EXTERN void png_write_hIST PNGARG((png_structp png_ptr, png_uint_16p hist, |
| 3132 | int num_hist)); |
| 3133 | #endif |
| 3134 | |
| 3135 | #if defined(PNG_WRITE_TEXT_SUPPORTED) || defined(PNG_WRITE_pCAL_SUPPORTED) || \ |
| 3136 | defined(PNG_WRITE_iCCP_SUPPORTED) || defined(PNG_WRITE_sPLT_SUPPORTED) |
| 3137 | PNG_EXTERN png_size_t png_check_keyword PNGARG((png_structp png_ptr, |
| 3138 | png_charp key, png_charpp new_key)); |
| 3139 | #endif |
| 3140 | |
| 3141 | #if defined(PNG_WRITE_tEXt_SUPPORTED) |
| 3142 | PNG_EXTERN void png_write_tEXt PNGARG((png_structp png_ptr, png_charp key, |
| 3143 | png_charp text, png_size_t text_len)); |
| 3144 | #endif |
| 3145 | |
| 3146 | #if defined(PNG_WRITE_zTXt_SUPPORTED) |
| 3147 | PNG_EXTERN void png_write_zTXt PNGARG((png_structp png_ptr, png_charp key, |
| 3148 | png_charp text, png_size_t text_len, int compression)); |
| 3149 | #endif |
| 3150 | |
| 3151 | #if defined(PNG_WRITE_iTXt_SUPPORTED) |
| 3152 | PNG_EXTERN void png_write_iTXt PNGARG((png_structp png_ptr, |
| 3153 | int compression, png_charp key, png_charp lang, png_charp lang_key, |
| 3154 | png_charp text)); |
| 3155 | #endif |
| 3156 | |
| 3157 | #if defined(PNG_TEXT_SUPPORTED) /* Added at version 1.0.14 and 1.2.4 */ |
| 3158 | PNG_EXTERN int png_set_text_2 PNGARG((png_structp png_ptr, |
| 3159 | png_infop info_ptr, png_textp text_ptr, int num_text)); |
| 3160 | #endif |
| 3161 | |
| 3162 | #if defined(PNG_WRITE_oFFs_SUPPORTED) |
| 3163 | PNG_EXTERN void png_write_oFFs PNGARG((png_structp png_ptr, |
| 3164 | png_int_32 x_offset, png_int_32 y_offset, int unit_type)); |
| 3165 | #endif |
| 3166 | |
| 3167 | #if defined(PNG_WRITE_pCAL_SUPPORTED) |
| 3168 | PNG_EXTERN void png_write_pCAL PNGARG((png_structp png_ptr, png_charp purpose, |
| 3169 | png_int_32 X0, png_int_32 X1, int type, int nparams, |
| 3170 | png_charp units, png_charpp params)); |
| 3171 | #endif |
| 3172 | |
| 3173 | #if defined(PNG_WRITE_pHYs_SUPPORTED) |
| 3174 | PNG_EXTERN void png_write_pHYs PNGARG((png_structp png_ptr, |
| 3175 | png_uint_32 x_pixels_per_unit, png_uint_32 y_pixels_per_unit, |
| 3176 | int unit_type)); |
| 3177 | #endif |
| 3178 | |
| 3179 | #if defined(PNG_WRITE_tIME_SUPPORTED) |
| 3180 | PNG_EXTERN void png_write_tIME PNGARG((png_structp png_ptr, |
| 3181 | png_timep mod_time)); |
| 3182 | #endif |
| 3183 | |
| 3184 | #if defined(PNG_WRITE_sCAL_SUPPORTED) |
| 3185 | #if defined(PNG_FLOATING_POINT_SUPPORTED) && !defined(PNG_NO_STDIO) |
| 3186 | PNG_EXTERN void png_write_sCAL PNGARG((png_structp png_ptr, |
| 3187 | int unit, double width, double height)); |
| 3188 | #else |
| 3189 | #ifdef PNG_FIXED_POINT_SUPPORTED |
| 3190 | PNG_EXTERN void png_write_sCAL_s PNGARG((png_structp png_ptr, |
| 3191 | int unit, png_charp width, png_charp height)); |
| 3192 | #endif |
| 3193 | #endif |
| 3194 | #endif |
| 3195 | |
| 3196 | /* Called when finished processing a row of data */ |
| 3197 | PNG_EXTERN void png_write_finish_row PNGARG((png_structp png_ptr)); |
| 3198 | |
| 3199 | /* Internal use only. Called before first row of data */ |
| 3200 | PNG_EXTERN void png_write_start_row PNGARG((png_structp png_ptr)); |
| 3201 | |
| 3202 | #if defined(PNG_READ_GAMMA_SUPPORTED) |
| 3203 | PNG_EXTERN void png_build_gamma_table PNGARG((png_structp png_ptr)); |
| 3204 | #endif |
| 3205 | |
| 3206 | /* combine a row of data, dealing with alpha, etc. if requested */ |
| 3207 | PNG_EXTERN void png_combine_row PNGARG((png_structp png_ptr, png_bytep row, |
| 3208 | int mask)); |
| 3209 | |
| 3210 | #if defined(PNG_READ_INTERLACING_SUPPORTED) |
| 3211 | /* expand an interlaced row */ |
| 3212 | /* OLD pre-1.0.9 interface: |
| 3213 | PNG_EXTERN void png_do_read_interlace PNGARG((png_row_infop row_info, |
| 3214 | png_bytep row, int pass, png_uint_32 transformations)); |
| 3215 | */ |
| 3216 | PNG_EXTERN void png_do_read_interlace PNGARG((png_structp png_ptr)); |
| 3217 | #endif |
| 3218 | |
| 3219 | /* GRR TO DO (2.0 or whenever): simplify other internal calling interfaces */ |
| 3220 | |
| 3221 | #if defined(PNG_WRITE_INTERLACING_SUPPORTED) |
| 3222 | /* grab pixels out of a row for an interlaced pass */ |
| 3223 | PNG_EXTERN void png_do_write_interlace PNGARG((png_row_infop row_info, |
| 3224 | png_bytep row, int pass)); |
| 3225 | #endif |
| 3226 | |
| 3227 | /* unfilter a row */ |
| 3228 | PNG_EXTERN void png_read_filter_row PNGARG((png_structp png_ptr, |
| 3229 | png_row_infop row_info, png_bytep row, png_bytep prev_row, int filter)); |
| 3230 | |
| 3231 | /* Choose the best filter to use and filter the row data */ |
| 3232 | PNG_EXTERN void png_write_find_filter PNGARG((png_structp png_ptr, |
| 3233 | png_row_infop row_info)); |
| 3234 | |
| 3235 | /* Write out the filtered row. */ |
| 3236 | PNG_EXTERN void png_write_filtered_row PNGARG((png_structp png_ptr, |
| 3237 | png_bytep filtered_row)); |
| 3238 | /* finish a row while reading, dealing with interlacing passes, etc. */ |
| 3239 | PNG_EXTERN void png_read_finish_row PNGARG((png_structp png_ptr)); |
| 3240 | |
| 3241 | /* initialize the row buffers, etc. */ |
| 3242 | PNG_EXTERN void png_read_start_row PNGARG((png_structp png_ptr)); |
| 3243 | /* optional call to update the users info structure */ |
| 3244 | PNG_EXTERN void png_read_transform_info PNGARG((png_structp png_ptr, |
| 3245 | png_infop info_ptr)); |
| 3246 | |
| 3247 | /* these are the functions that do the transformations */ |
| 3248 | #if defined(PNG_READ_FILLER_SUPPORTED) |
| 3249 | PNG_EXTERN void png_do_read_filler PNGARG((png_row_infop row_info, |
| 3250 | png_bytep row, png_uint_32 filler, png_uint_32 flags)); |
| 3251 | #endif |
| 3252 | |
| 3253 | #if defined(PNG_READ_SWAP_ALPHA_SUPPORTED) |
| 3254 | PNG_EXTERN void png_do_read_swap_alpha PNGARG((png_row_infop row_info, |
| 3255 | png_bytep row)); |
| 3256 | #endif |
| 3257 | |
| 3258 | #if defined(PNG_WRITE_SWAP_ALPHA_SUPPORTED) |
| 3259 | PNG_EXTERN void png_do_write_swap_alpha PNGARG((png_row_infop row_info, |
| 3260 | png_bytep row)); |
| 3261 | #endif |
| 3262 | |
| 3263 | #if defined(PNG_READ_INVERT_ALPHA_SUPPORTED) |
| 3264 | PNG_EXTERN void png_do_read_invert_alpha PNGARG((png_row_infop row_info, |
| 3265 | png_bytep row)); |
| 3266 | #endif |
| 3267 | |
| 3268 | #if defined(PNG_WRITE_INVERT_ALPHA_SUPPORTED) |
| 3269 | PNG_EXTERN void png_do_write_invert_alpha PNGARG((png_row_infop row_info, |
| 3270 | png_bytep row)); |
| 3271 | #endif |
| 3272 | |
| 3273 | #if defined(PNG_WRITE_FILLER_SUPPORTED) || \ |
| 3274 | defined(PNG_READ_STRIP_ALPHA_SUPPORTED) |
| 3275 | PNG_EXTERN void png_do_strip_filler PNGARG((png_row_infop row_info, |
| 3276 | png_bytep row, png_uint_32 flags)); |
| 3277 | #endif |
| 3278 | |
| 3279 | #if defined(PNG_READ_SWAP_SUPPORTED) || defined(PNG_WRITE_SWAP_SUPPORTED) |
| 3280 | PNG_EXTERN void png_do_swap PNGARG((png_row_infop row_info, png_bytep row)); |
| 3281 | #endif |
| 3282 | |
| 3283 | #if defined(PNG_READ_PACKSWAP_SUPPORTED) || defined(PNG_WRITE_PACKSWAP_SUPPORTED) |
| 3284 | PNG_EXTERN void png_do_packswap PNGARG((png_row_infop row_info, png_bytep row)); |
| 3285 | #endif |
| 3286 | |
| 3287 | #if defined(PNG_READ_RGB_TO_GRAY_SUPPORTED) |
| 3288 | PNG_EXTERN int png_do_rgb_to_gray PNGARG((png_structp png_ptr, png_row_infop |
| 3289 | row_info, png_bytep row)); |
| 3290 | #endif |
| 3291 | |
| 3292 | #if defined(PNG_READ_GRAY_TO_RGB_SUPPORTED) |
| 3293 | PNG_EXTERN void png_do_gray_to_rgb PNGARG((png_row_infop row_info, |
| 3294 | png_bytep row)); |
| 3295 | #endif |
| 3296 | |
| 3297 | #if defined(PNG_READ_PACK_SUPPORTED) |
| 3298 | PNG_EXTERN void png_do_unpack PNGARG((png_row_infop row_info, png_bytep row)); |
| 3299 | #endif |
| 3300 | |
| 3301 | #if defined(PNG_READ_SHIFT_SUPPORTED) |
| 3302 | PNG_EXTERN void png_do_unshift PNGARG((png_row_infop row_info, png_bytep row, |
| 3303 | png_color_8p sig_bits)); |
| 3304 | #endif |
| 3305 | |
| 3306 | #if defined(PNG_READ_INVERT_SUPPORTED) || defined(PNG_WRITE_INVERT_SUPPORTED) |
| 3307 | PNG_EXTERN void png_do_invert PNGARG((png_row_infop row_info, png_bytep row)); |
| 3308 | #endif |
| 3309 | |
| 3310 | #if defined(PNG_READ_16_TO_8_SUPPORTED) |
| 3311 | PNG_EXTERN void png_do_chop PNGARG((png_row_infop row_info, png_bytep row)); |
| 3312 | #endif |
| 3313 | |
| 3314 | #if defined(PNG_READ_DITHER_SUPPORTED) |
| 3315 | PNG_EXTERN void png_do_dither PNGARG((png_row_infop row_info, |
| 3316 | png_bytep row, png_bytep palette_lookup, png_bytep dither_lookup)); |
| 3317 | |
| 3318 | # if defined(PNG_CORRECT_PALETTE_SUPPORTED) |
| 3319 | PNG_EXTERN void png_correct_palette PNGARG((png_structp png_ptr, |
| 3320 | png_colorp palette, int num_palette)); |
| 3321 | # endif |
| 3322 | #endif |
| 3323 | |
| 3324 | #if defined(PNG_READ_BGR_SUPPORTED) || defined(PNG_WRITE_BGR_SUPPORTED) |
| 3325 | PNG_EXTERN void png_do_bgr PNGARG((png_row_infop row_info, png_bytep row)); |
| 3326 | #endif |
| 3327 | |
| 3328 | #if defined(PNG_WRITE_PACK_SUPPORTED) |
| 3329 | PNG_EXTERN void png_do_pack PNGARG((png_row_infop row_info, |
| 3330 | png_bytep row, png_uint_32 bit_depth)); |
| 3331 | #endif |
| 3332 | |
| 3333 | #if defined(PNG_WRITE_SHIFT_SUPPORTED) |
| 3334 | PNG_EXTERN void png_do_shift PNGARG((png_row_infop row_info, png_bytep row, |
| 3335 | png_color_8p bit_depth)); |
| 3336 | #endif |
| 3337 | |
| 3338 | #if defined(PNG_READ_BACKGROUND_SUPPORTED) |
| 3339 | #if defined(PNG_READ_GAMMA_SUPPORTED) |
| 3340 | PNG_EXTERN void png_do_background PNGARG((png_row_infop row_info, png_bytep row, |
| 3341 | png_color_16p trans_values, png_color_16p background, |
| 3342 | png_color_16p background_1, |
| 3343 | png_bytep gamma_table, png_bytep gamma_from_1, png_bytep gamma_to_1, |
| 3344 | png_uint_16pp gamma_16, png_uint_16pp gamma_16_from_1, |
| 3345 | png_uint_16pp gamma_16_to_1, int gamma_shift)); |
| 3346 | #else |
| 3347 | PNG_EXTERN void png_do_background PNGARG((png_row_infop row_info, png_bytep row, |
| 3348 | png_color_16p trans_values, png_color_16p background)); |
| 3349 | #endif |
| 3350 | #endif |
| 3351 | |
| 3352 | #if defined(PNG_READ_GAMMA_SUPPORTED) |
| 3353 | PNG_EXTERN void png_do_gamma PNGARG((png_row_infop row_info, png_bytep row, |
| 3354 | png_bytep gamma_table, png_uint_16pp gamma_16_table, |
| 3355 | int gamma_shift)); |
| 3356 | #endif |
| 3357 | |
| 3358 | #if defined(PNG_READ_EXPAND_SUPPORTED) |
| 3359 | PNG_EXTERN void png_do_expand_palette PNGARG((png_row_infop row_info, |
| 3360 | png_bytep row, png_colorp palette, png_bytep trans, int num_trans)); |
| 3361 | PNG_EXTERN void png_do_expand PNGARG((png_row_infop row_info, |
| 3362 | png_bytep row, png_color_16p trans_value)); |
| 3363 | #endif |
| 3364 | |
| 3365 | /* The following decodes the appropriate chunks, and does error correction, |
| 3366 | * then calls the appropriate callback for the chunk if it is valid. |
| 3367 | */ |
| 3368 | |
| 3369 | /* decode the IHDR chunk */ |
| 3370 | PNG_EXTERN void png_handle_IHDR PNGARG((png_structp png_ptr, png_infop info_ptr, |
| 3371 | png_uint_32 length)); |
| 3372 | PNG_EXTERN void png_handle_PLTE PNGARG((png_structp png_ptr, png_infop info_ptr, |
| 3373 | png_uint_32 length)); |
| 3374 | PNG_EXTERN void png_handle_IEND PNGARG((png_structp png_ptr, png_infop info_ptr, |
| 3375 | png_uint_32 length)); |
| 3376 | |
| 3377 | #if defined(PNG_READ_bKGD_SUPPORTED) |
| 3378 | PNG_EXTERN void png_handle_bKGD PNGARG((png_structp png_ptr, png_infop info_ptr, |
| 3379 | png_uint_32 length)); |
| 3380 | #endif |
| 3381 | |
| 3382 | #if defined(PNG_READ_cHRM_SUPPORTED) |
| 3383 | PNG_EXTERN void png_handle_cHRM PNGARG((png_structp png_ptr, png_infop info_ptr, |
| 3384 | png_uint_32 length)); |
| 3385 | #endif |
| 3386 | |
| 3387 | #if defined(PNG_READ_gAMA_SUPPORTED) |
| 3388 | PNG_EXTERN void png_handle_gAMA PNGARG((png_structp png_ptr, png_infop info_ptr, |
| 3389 | png_uint_32 length)); |
| 3390 | #endif |
| 3391 | |
| 3392 | #if defined(PNG_READ_hIST_SUPPORTED) |
| 3393 | PNG_EXTERN void png_handle_hIST PNGARG((png_structp png_ptr, png_infop info_ptr, |
| 3394 | png_uint_32 length)); |
| 3395 | #endif |
| 3396 | |
| 3397 | #if defined(PNG_READ_iCCP_SUPPORTED) |
| 3398 | extern void png_handle_iCCP PNGARG((png_structp png_ptr, png_infop info_ptr, |
| 3399 | png_uint_32 length)); |
| 3400 | #endif /* PNG_READ_iCCP_SUPPORTED */ |
| 3401 | |
| 3402 | #if defined(PNG_READ_iTXt_SUPPORTED) |
| 3403 | PNG_EXTERN void png_handle_iTXt PNGARG((png_structp png_ptr, png_infop info_ptr, |
| 3404 | png_uint_32 length)); |
| 3405 | #endif |
| 3406 | |
| 3407 | #if defined(PNG_READ_oFFs_SUPPORTED) |
| 3408 | PNG_EXTERN void png_handle_oFFs PNGARG((png_structp png_ptr, png_infop info_ptr, |
| 3409 | png_uint_32 length)); |
| 3410 | #endif |
| 3411 | |
| 3412 | #if defined(PNG_READ_pCAL_SUPPORTED) |
| 3413 | PNG_EXTERN void png_handle_pCAL PNGARG((png_structp png_ptr, png_infop info_ptr, |
| 3414 | png_uint_32 length)); |
| 3415 | #endif |
| 3416 | |
| 3417 | #if defined(PNG_READ_pHYs_SUPPORTED) |
| 3418 | PNG_EXTERN void png_handle_pHYs PNGARG((png_structp png_ptr, png_infop info_ptr, |
| 3419 | png_uint_32 length)); |
| 3420 | #endif |
| 3421 | |
| 3422 | #if defined(PNG_READ_sBIT_SUPPORTED) |
| 3423 | PNG_EXTERN void png_handle_sBIT PNGARG((png_structp png_ptr, png_infop info_ptr, |
| 3424 | png_uint_32 length)); |
| 3425 | #endif |
| 3426 | |
| 3427 | #if defined(PNG_READ_sCAL_SUPPORTED) |
| 3428 | PNG_EXTERN void png_handle_sCAL PNGARG((png_structp png_ptr, png_infop info_ptr, |
| 3429 | png_uint_32 length)); |
| 3430 | #endif |
| 3431 | |
| 3432 | #if defined(PNG_READ_sPLT_SUPPORTED) |
| 3433 | extern void png_handle_sPLT PNGARG((png_structp png_ptr, png_infop info_ptr, |
| 3434 | png_uint_32 length)); |
| 3435 | #endif /* PNG_READ_sPLT_SUPPORTED */ |
| 3436 | |
| 3437 | #if defined(PNG_READ_sRGB_SUPPORTED) |
| 3438 | PNG_EXTERN void png_handle_sRGB PNGARG((png_structp png_ptr, png_infop info_ptr, |
| 3439 | png_uint_32 length)); |
| 3440 | #endif |
| 3441 | |
| 3442 | #if defined(PNG_READ_tEXt_SUPPORTED) |
| 3443 | PNG_EXTERN void png_handle_tEXt PNGARG((png_structp png_ptr, png_infop info_ptr, |
| 3444 | png_uint_32 length)); |
| 3445 | #endif |
| 3446 | |
| 3447 | #if defined(PNG_READ_tIME_SUPPORTED) |
| 3448 | PNG_EXTERN void png_handle_tIME PNGARG((png_structp png_ptr, png_infop info_ptr, |
| 3449 | png_uint_32 length)); |
| 3450 | #endif |
| 3451 | |
| 3452 | #if defined(PNG_READ_tRNS_SUPPORTED) |
| 3453 | PNG_EXTERN void png_handle_tRNS PNGARG((png_structp png_ptr, png_infop info_ptr, |
| 3454 | png_uint_32 length)); |
| 3455 | #endif |
| 3456 | |
| 3457 | #if defined(PNG_READ_zTXt_SUPPORTED) |
| 3458 | PNG_EXTERN void png_handle_zTXt PNGARG((png_structp png_ptr, png_infop info_ptr, |
| 3459 | png_uint_32 length)); |
| 3460 | #endif |
| 3461 | |
| 3462 | PNG_EXTERN void png_handle_unknown PNGARG((png_structp png_ptr, |
| 3463 | png_infop info_ptr, png_uint_32 length)); |
| 3464 | |
| 3465 | PNG_EXTERN void png_check_chunk_name PNGARG((png_structp png_ptr, |
| 3466 | png_bytep chunk_name)); |
| 3467 | |
| 3468 | /* handle the transformations for reading and writing */ |
| 3469 | PNG_EXTERN void png_do_read_transformations PNGARG((png_structp png_ptr)); |
| 3470 | PNG_EXTERN void png_do_write_transformations PNGARG((png_structp png_ptr)); |
| 3471 | |
| 3472 | PNG_EXTERN void png_init_read_transformations PNGARG((png_structp png_ptr)); |
| 3473 | |
| 3474 | #ifdef PNG_PROGRESSIVE_READ_SUPPORTED |
| 3475 | PNG_EXTERN void png_push_read_chunk PNGARG((png_structp png_ptr, |
| 3476 | png_infop info_ptr)); |
| 3477 | PNG_EXTERN void png_push_read_sig PNGARG((png_structp png_ptr, |
| 3478 | png_infop info_ptr)); |
| 3479 | PNG_EXTERN void png_push_check_crc PNGARG((png_structp png_ptr)); |
| 3480 | PNG_EXTERN void png_push_crc_skip PNGARG((png_structp png_ptr, |
| 3481 | png_uint_32 length)); |
| 3482 | PNG_EXTERN void png_push_crc_finish PNGARG((png_structp png_ptr)); |
| 3483 | PNG_EXTERN void png_push_save_buffer PNGARG((png_structp png_ptr)); |
| 3484 | PNG_EXTERN void png_push_restore_buffer PNGARG((png_structp png_ptr, |
| 3485 | png_bytep buffer, png_size_t buffer_length)); |
| 3486 | PNG_EXTERN void png_push_read_IDAT PNGARG((png_structp png_ptr)); |
| 3487 | PNG_EXTERN void png_process_IDAT_data PNGARG((png_structp png_ptr, |
| 3488 | png_bytep buffer, png_size_t buffer_length)); |
| 3489 | PNG_EXTERN void png_push_process_row PNGARG((png_structp png_ptr)); |
| 3490 | PNG_EXTERN void png_push_handle_unknown PNGARG((png_structp png_ptr, |
| 3491 | png_infop info_ptr, png_uint_32 length)); |
| 3492 | PNG_EXTERN void png_push_have_info PNGARG((png_structp png_ptr, |
| 3493 | png_infop info_ptr)); |
| 3494 | PNG_EXTERN void png_push_have_end PNGARG((png_structp png_ptr, |
| 3495 | png_infop info_ptr)); |
| 3496 | PNG_EXTERN void png_push_have_row PNGARG((png_structp png_ptr, png_bytep row)); |
| 3497 | PNG_EXTERN void png_push_read_end PNGARG((png_structp png_ptr, |
| 3498 | png_infop info_ptr)); |
| 3499 | PNG_EXTERN void png_process_some_data PNGARG((png_structp png_ptr, |
| 3500 | png_infop info_ptr)); |
| 3501 | PNG_EXTERN void png_read_push_finish_row PNGARG((png_structp png_ptr)); |
| 3502 | #if defined(PNG_READ_tEXt_SUPPORTED) |
| 3503 | PNG_EXTERN void png_push_handle_tEXt PNGARG((png_structp png_ptr, |
| 3504 | png_infop info_ptr, png_uint_32 length)); |
| 3505 | PNG_EXTERN void png_push_read_tEXt PNGARG((png_structp png_ptr, |
| 3506 | png_infop info_ptr)); |
| 3507 | #endif |
| 3508 | #if defined(PNG_READ_zTXt_SUPPORTED) |
| 3509 | PNG_EXTERN void png_push_handle_zTXt PNGARG((png_structp png_ptr, |
| 3510 | png_infop info_ptr, png_uint_32 length)); |
| 3511 | PNG_EXTERN void png_push_read_zTXt PNGARG((png_structp png_ptr, |
| 3512 | png_infop info_ptr)); |
| 3513 | #endif |
| 3514 | #if defined(PNG_READ_iTXt_SUPPORTED) |
| 3515 | PNG_EXTERN void png_push_handle_iTXt PNGARG((png_structp png_ptr, |
| 3516 | png_infop info_ptr, png_uint_32 length)); |
| 3517 | PNG_EXTERN void png_push_read_iTXt PNGARG((png_structp png_ptr, |
| 3518 | png_infop info_ptr)); |
| 3519 | #endif |
| 3520 | |
| 3521 | #endif /* PNG_PROGRESSIVE_READ_SUPPORTED */ |
| 3522 | |
| 3523 | #ifdef PNG_MNG_FEATURES_SUPPORTED |
| 3524 | PNG_EXTERN void png_do_read_intrapixel PNGARG((png_row_infop row_info, |
| 3525 | png_bytep row)); |
| 3526 | PNG_EXTERN void png_do_write_intrapixel PNGARG((png_row_infop row_info, |
| 3527 | png_bytep row)); |
| 3528 | #endif |
| 3529 | |
| 3530 | #if defined(PNG_ASSEMBLER_CODE_SUPPORTED) |
| 3531 | #if defined(PNG_MMX_CODE_SUPPORTED) |
| 3532 | /* png.c */ /* PRIVATE */ |
| 3533 | PNG_EXTERN void png_init_mmx_flags PNGARG((png_structp png_ptr)); |
| 3534 | #endif |
| 3535 | #endif |
| 3536 | |
| 3537 | #if defined(PNG_INCH_CONVERSIONS) && defined(PNG_FLOATING_POINT_SUPPORTED) |
| 3538 | PNG_EXTERN png_uint_32 png_get_pixels_per_inch PNGARG((png_structp png_ptr, |
| 3539 | png_infop info_ptr)); |
| 3540 | |
| 3541 | PNG_EXTERN png_uint_32 png_get_x_pixels_per_inch PNGARG((png_structp png_ptr, |
| 3542 | png_infop info_ptr)); |
| 3543 | |
| 3544 | PNG_EXTERN png_uint_32 png_get_y_pixels_per_inch PNGARG((png_structp png_ptr, |
| 3545 | png_infop info_ptr)); |
| 3546 | |
| 3547 | PNG_EXTERN float png_get_x_offset_inches PNGARG((png_structp png_ptr, |
| 3548 | png_infop info_ptr)); |
| 3549 | |
| 3550 | PNG_EXTERN float png_get_y_offset_inches PNGARG((png_structp png_ptr, |
| 3551 | png_infop info_ptr)); |
| 3552 | |
| 3553 | #if defined(PNG_pHYs_SUPPORTED) |
| 3554 | PNG_EXTERN png_uint_32 png_get_pHYs_dpi PNGARG((png_structp png_ptr, |
| 3555 | png_infop info_ptr, png_uint_32 *res_x, png_uint_32 *res_y, int *unit_type)); |
| 3556 | #endif /* PNG_pHYs_SUPPORTED */ |
| 3557 | #endif /* PNG_INCH_CONVERSIONS && PNG_FLOATING_POINT_SUPPORTED */ |
| 3558 | |
| 3559 | /* Maintainer: Put new private prototypes here ^ and in libpngpf.3 */ |
| 3560 | |
| 3561 | #endif /* PNG_INTERNAL */ |
| 3562 | |
| 3563 | #ifdef __cplusplus |
| 3564 | } |
| 3565 | #endif |
| 3566 | |
| 3567 | #endif /* PNG_VERSION_INFO_ONLY */ |
| 3568 | /* do not put anything past this line */ |
| 3569 | #endif /* PNG_H */ |