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annotate libs/libpng/png.h @ 35:23e5d274b2a2

find changesets by author, revision, files, or words in the commit message
added options panel, also added the xib files to the repository as they're needed
author John Tsiombikas <nuclear@member.fsf.org>
date Fri, 09 Sep 2011 10:03:42 +0300
parents
children
rev   line source
nuclear@26 1 /* png.h - header file for PNG reference library
nuclear@26 2 *
nuclear@26 3 * libpng version 1.2.33 - October 31, 2008
nuclear@26 4 * Copyright (c) 1998-2008 Glenn Randers-Pehrson
nuclear@26 5 * (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger)
nuclear@26 6 * (Version 0.88 Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.)
nuclear@26 7 *
nuclear@26 8 * Authors and maintainers:
nuclear@26 9 * libpng versions 0.71, May 1995, through 0.88, January 1996: Guy Schalnat
nuclear@26 10 * libpng versions 0.89c, June 1996, through 0.96, May 1997: Andreas Dilger
nuclear@26 11 * libpng versions 0.97, January 1998, through 1.2.33 - October 31, 2008: Glenn
nuclear@26 12 * See also "Contributing Authors", below.
nuclear@26 13 *
nuclear@26 14 * Note about libpng version numbers:
nuclear@26 15 *
nuclear@26 16 * Due to various miscommunications, unforeseen code incompatibilities
nuclear@26 17 * and occasional factors outside the authors' control, version numbering
nuclear@26 18 * on the library has not always been consistent and straightforward.
nuclear@26 19 * The following table summarizes matters since version 0.89c, which was
nuclear@26 20 * the first widely used release:
nuclear@26 21 *
nuclear@26 22 * source png.h png.h shared-lib
nuclear@26 23 * version string int version
nuclear@26 24 * ------- ------ ----- ----------
nuclear@26 25 * 0.89c "1.0 beta 3" 0.89 89 1.0.89
nuclear@26 26 * 0.90 "1.0 beta 4" 0.90 90 0.90 [should have been 2.0.90]
nuclear@26 27 * 0.95 "1.0 beta 5" 0.95 95 0.95 [should have been 2.0.95]
nuclear@26 28 * 0.96 "1.0 beta 6" 0.96 96 0.96 [should have been 2.0.96]
nuclear@26 29 * 0.97b "1.00.97 beta 7" 1.00.97 97 1.0.1 [should have been 2.0.97]
nuclear@26 30 * 0.97c 0.97 97 2.0.97
nuclear@26 31 * 0.98 0.98 98 2.0.98
nuclear@26 32 * 0.99 0.99 98 2.0.99
nuclear@26 33 * 0.99a-m 0.99 99 2.0.99
nuclear@26 34 * 1.00 1.00 100 2.1.0 [100 should be 10000]
nuclear@26 35 * 1.0.0 (from here on, the 100 2.1.0 [100 should be 10000]
nuclear@26 36 * 1.0.1 png.h string is 10001 2.1.0
nuclear@26 37 * 1.0.1a-e identical to the 10002 from here on, the shared library
nuclear@26 38 * 1.0.2 source version) 10002 is 2.V where V is the source code
nuclear@26 39 * 1.0.2a-b 10003 version, except as noted.
nuclear@26 40 * 1.0.3 10003
nuclear@26 41 * 1.0.3a-d 10004
nuclear@26 42 * 1.0.4 10004
nuclear@26 43 * 1.0.4a-f 10005
nuclear@26 44 * 1.0.5 (+ 2 patches) 10005
nuclear@26 45 * 1.0.5a-d 10006
nuclear@26 46 * 1.0.5e-r 10100 (not source compatible)
nuclear@26 47 * 1.0.5s-v 10006 (not binary compatible)
nuclear@26 48 * 1.0.6 (+ 3 patches) 10006 (still binary incompatible)
nuclear@26 49 * 1.0.6d-f 10007 (still binary incompatible)
nuclear@26 50 * 1.0.6g 10007
nuclear@26 51 * 1.0.6h 10007 10.6h (testing xy.z so-numbering)
nuclear@26 52 * 1.0.6i 10007 10.6i
nuclear@26 53 * 1.0.6j 10007 2.1.0.6j (incompatible with 1.0.0)
nuclear@26 54 * 1.0.7beta11-14 DLLNUM 10007 2.1.0.7beta11-14 (binary compatible)
nuclear@26 55 * 1.0.7beta15-18 1 10007 2.1.0.7beta15-18 (binary compatible)
nuclear@26 56 * 1.0.7rc1-2 1 10007 2.1.0.7rc1-2 (binary compatible)
nuclear@26 57 * 1.0.7 1 10007 (still compatible)
nuclear@26 58 * 1.0.8beta1-4 1 10008 2.1.0.8beta1-4
nuclear@26 59 * 1.0.8rc1 1 10008 2.1.0.8rc1
nuclear@26 60 * 1.0.8 1 10008 2.1.0.8
nuclear@26 61 * 1.0.9beta1-6 1 10009 2.1.0.9beta1-6
nuclear@26 62 * 1.0.9rc1 1 10009 2.1.0.9rc1
nuclear@26 63 * 1.0.9beta7-10 1 10009 2.1.0.9beta7-10
nuclear@26 64 * 1.0.9rc2 1 10009 2.1.0.9rc2
nuclear@26 65 * 1.0.9 1 10009 2.1.0.9
nuclear@26 66 * 1.0.10beta1 1 10010 2.1.0.10beta1
nuclear@26 67 * 1.0.10rc1 1 10010 2.1.0.10rc1
nuclear@26 68 * 1.0.10 1 10010 2.1.0.10
nuclear@26 69 * 1.0.11beta1-3 1 10011 2.1.0.11beta1-3
nuclear@26 70 * 1.0.11rc1 1 10011 2.1.0.11rc1
nuclear@26 71 * 1.0.11 1 10011 2.1.0.11
nuclear@26 72 * 1.0.12beta1-2 2 10012 2.1.0.12beta1-2
nuclear@26 73 * 1.0.12rc1 2 10012 2.1.0.12rc1
nuclear@26 74 * 1.0.12 2 10012 2.1.0.12
nuclear@26 75 * 1.1.0a-f - 10100 2.1.1.0a-f (branch abandoned)
nuclear@26 76 * 1.2.0beta1-2 2 10200 2.1.2.0beta1-2
nuclear@26 77 * 1.2.0beta3-5 3 10200 3.1.2.0beta3-5
nuclear@26 78 * 1.2.0rc1 3 10200 3.1.2.0rc1
nuclear@26 79 * 1.2.0 3 10200 3.1.2.0
nuclear@26 80 * 1.2.1beta1-4 3 10201 3.1.2.1beta1-4
nuclear@26 81 * 1.2.1rc1-2 3 10201 3.1.2.1rc1-2
nuclear@26 82 * 1.2.1 3 10201 3.1.2.1
nuclear@26 83 * 1.2.2beta1-6 12 10202 12.so.0.1.2.2beta1-6
nuclear@26 84 * 1.0.13beta1 10 10013 10.so.0.1.0.13beta1
nuclear@26 85 * 1.0.13rc1 10 10013 10.so.0.1.0.13rc1
nuclear@26 86 * 1.2.2rc1 12 10202 12.so.0.1.2.2rc1
nuclear@26 87 * 1.0.13 10 10013 10.so.0.1.0.13
nuclear@26 88 * 1.2.2 12 10202 12.so.0.1.2.2
nuclear@26 89 * 1.2.3rc1-6 12 10203 12.so.0.1.2.3rc1-6
nuclear@26 90 * 1.2.3 12 10203 12.so.0.1.2.3
nuclear@26 91 * 1.2.4beta1-3 13 10204 12.so.0.1.2.4beta1-3
nuclear@26 92 * 1.0.14rc1 13 10014 10.so.0.1.0.14rc1
nuclear@26 93 * 1.2.4rc1 13 10204 12.so.0.1.2.4rc1
nuclear@26 94 * 1.0.14 10 10014 10.so.0.1.0.14
nuclear@26 95 * 1.2.4 13 10204 12.so.0.1.2.4
nuclear@26 96 * 1.2.5beta1-2 13 10205 12.so.0.1.2.5beta1-2
nuclear@26 97 * 1.0.15rc1-3 10 10015 10.so.0.1.0.15rc1-3
nuclear@26 98 * 1.2.5rc1-3 13 10205 12.so.0.1.2.5rc1-3
nuclear@26 99 * 1.0.15 10 10015 10.so.0.1.0.15
nuclear@26 100 * 1.2.5 13 10205 12.so.0.1.2.5
nuclear@26 101 * 1.2.6beta1-4 13 10206 12.so.0.1.2.6beta1-4
nuclear@26 102 * 1.0.16 10 10016 10.so.0.1.0.16
nuclear@26 103 * 1.2.6 13 10206 12.so.0.1.2.6
nuclear@26 104 * 1.2.7beta1-2 13 10207 12.so.0.1.2.7beta1-2
nuclear@26 105 * 1.0.17rc1 10 10017 10.so.0.1.0.17rc1
nuclear@26 106 * 1.2.7rc1 13 10207 12.so.0.1.2.7rc1
nuclear@26 107 * 1.0.17 10 10017 10.so.0.1.0.17
nuclear@26 108 * 1.2.7 13 10207 12.so.0.1.2.7
nuclear@26 109 * 1.2.8beta1-5 13 10208 12.so.0.1.2.8beta1-5
nuclear@26 110 * 1.0.18rc1-5 10 10018 10.so.0.1.0.18rc1-5
nuclear@26 111 * 1.2.8rc1-5 13 10208 12.so.0.1.2.8rc1-5
nuclear@26 112 * 1.0.18 10 10018 10.so.0.1.0.18
nuclear@26 113 * 1.2.8 13 10208 12.so.0.1.2.8
nuclear@26 114 * 1.2.9beta1-3 13 10209 12.so.0.1.2.9beta1-3
nuclear@26 115 * 1.2.9beta4-11 13 10209 12.so.0.9[.0]
nuclear@26 116 * 1.2.9rc1 13 10209 12.so.0.9[.0]
nuclear@26 117 * 1.2.9 13 10209 12.so.0.9[.0]
nuclear@26 118 * 1.2.10beta1-8 13 10210 12.so.0.10[.0]
nuclear@26 119 * 1.2.10rc1-3 13 10210 12.so.0.10[.0]
nuclear@26 120 * 1.2.10 13 10210 12.so.0.10[.0]
nuclear@26 121 * 1.2.11beta1-4 13 10211 12.so.0.11[.0]
nuclear@26 122 * 1.0.19rc1-5 10 10019 10.so.0.19[.0]
nuclear@26 123 * 1.2.11rc1-5 13 10211 12.so.0.11[.0]
nuclear@26 124 * 1.0.19 10 10019 10.so.0.19[.0]
nuclear@26 125 * 1.2.11 13 10211 12.so.0.11[.0]
nuclear@26 126 * 1.0.20 10 10020 10.so.0.20[.0]
nuclear@26 127 * 1.2.12 13 10212 12.so.0.12[.0]
nuclear@26 128 * 1.2.13beta1 13 10213 12.so.0.13[.0]
nuclear@26 129 * 1.0.21 10 10021 10.so.0.21[.0]
nuclear@26 130 * 1.2.13 13 10213 12.so.0.13[.0]
nuclear@26 131 * 1.2.14beta1-2 13 10214 12.so.0.14[.0]
nuclear@26 132 * 1.0.22rc1 10 10022 10.so.0.22[.0]
nuclear@26 133 * 1.2.14rc1 13 10214 12.so.0.14[.0]
nuclear@26 134 * 1.0.22 10 10022 10.so.0.22[.0]
nuclear@26 135 * 1.2.14 13 10214 12.so.0.14[.0]
nuclear@26 136 * 1.2.15beta1-6 13 10215 12.so.0.15[.0]
nuclear@26 137 * 1.0.23rc1-5 10 10023 10.so.0.23[.0]
nuclear@26 138 * 1.2.15rc1-5 13 10215 12.so.0.15[.0]
nuclear@26 139 * 1.0.23 10 10023 10.so.0.23[.0]
nuclear@26 140 * 1.2.15 13 10215 12.so.0.15[.0]
nuclear@26 141 * 1.2.16beta1-2 13 10216 12.so.0.16[.0]
nuclear@26 142 * 1.2.16rc1 13 10216 12.so.0.16[.0]
nuclear@26 143 * 1.0.24 10 10024 10.so.0.24[.0]
nuclear@26 144 * 1.2.16 13 10216 12.so.0.16[.0]
nuclear@26 145 * 1.2.17beta1-2 13 10217 12.so.0.17[.0]
nuclear@26 146 * 1.0.25rc1 10 10025 10.so.0.25[.0]
nuclear@26 147 * 1.2.17rc1-3 13 10217 12.so.0.17[.0]
nuclear@26 148 * 1.0.25 10 10025 10.so.0.25[.0]
nuclear@26 149 * 1.2.17 13 10217 12.so.0.17[.0]
nuclear@26 150 * 1.0.26 10 10026 10.so.0.26[.0]
nuclear@26 151 * 1.2.18 13 10218 12.so.0.18[.0]
nuclear@26 152 * 1.2.19beta1-31 13 10219 12.so.0.19[.0]
nuclear@26 153 * 1.0.27rc1-6 10 10027 10.so.0.27[.0]
nuclear@26 154 * 1.2.19rc1-6 13 10219 12.so.0.19[.0]
nuclear@26 155 * 1.0.27 10 10027 10.so.0.27[.0]
nuclear@26 156 * 1.2.19 13 10219 12.so.0.19[.0]
nuclear@26 157 * 1.2.20beta01-04 13 10220 12.so.0.20[.0]
nuclear@26 158 * 1.0.28rc1-6 10 10028 10.so.0.28[.0]
nuclear@26 159 * 1.2.20rc1-6 13 10220 12.so.0.20[.0]
nuclear@26 160 * 1.0.28 10 10028 10.so.0.28[.0]
nuclear@26 161 * 1.2.20 13 10220 12.so.0.20[.0]
nuclear@26 162 * 1.2.21beta1-2 13 10221 12.so.0.21[.0]
nuclear@26 163 * 1.2.21rc1-3 13 10221 12.so.0.21[.0]
nuclear@26 164 * 1.0.29 10 10029 10.so.0.29[.0]
nuclear@26 165 * 1.2.21 13 10221 12.so.0.21[.0]
nuclear@26 166 * 1.2.22beta1-4 13 10222 12.so.0.22[.0]
nuclear@26 167 * 1.0.30rc1 10 10030 10.so.0.30[.0]
nuclear@26 168 * 1.2.22rc1 13 10222 12.so.0.22[.0]
nuclear@26 169 * 1.0.30 10 10030 10.so.0.30[.0]
nuclear@26 170 * 1.2.22 13 10222 12.so.0.22[.0]
nuclear@26 171 * 1.2.23beta01-05 13 10223 12.so.0.23[.0]
nuclear@26 172 * 1.2.23rc01 13 10223 12.so.0.23[.0]
nuclear@26 173 * 1.2.23 13 10223 12.so.0.23[.0]
nuclear@26 174 * 1.2.24beta01-02 13 10224 12.so.0.24[.0]
nuclear@26 175 * 1.2.24rc01 13 10224 12.so.0.24[.0]
nuclear@26 176 * 1.2.24 13 10224 12.so.0.24[.0]
nuclear@26 177 * 1.2.25beta01-06 13 10225 12.so.0.25[.0]
nuclear@26 178 * 1.2.25rc01-02 13 10225 12.so.0.25[.0]
nuclear@26 179 * 1.0.31 10 10031 10.so.0.31[.0]
nuclear@26 180 * 1.2.25 13 10225 12.so.0.25[.0]
nuclear@26 181 * 1.2.26beta01-06 13 10226 12.so.0.26[.0]
nuclear@26 182 * 1.2.26rc01 13 10226 12.so.0.26[.0]
nuclear@26 183 * 1.2.26 13 10226 12.so.0.26[.0]
nuclear@26 184 * 1.0.32 10 10032 10.so.0.32[.0]
nuclear@26 185 * 1.2.27beta01-06 13 10227 12.so.0.27[.0]
nuclear@26 186 * 1.2.27rc01 13 10227 12.so.0.27[.0]
nuclear@26 187 * 1.0.33 10 10033 10.so.0.33[.0]
nuclear@26 188 * 1.2.27 13 10227 12.so.0.27[.0]
nuclear@26 189 * 1.0.34 10 10034 10.so.0.34[.0]
nuclear@26 190 * 1.2.28 13 10228 12.so.0.28[.0]
nuclear@26 191 * 1.2.29beta01-03 13 10229 12.so.0.29[.0]
nuclear@26 192 * 1.2.29rc01 13 10229 12.so.0.29[.0]
nuclear@26 193 * 1.0.35 10 10035 10.so.0.35[.0]
nuclear@26 194 * 1.2.29 13 10229 12.so.0.29[.0]
nuclear@26 195 * 1.0.37 10 10037 10.so.0.37[.0]
nuclear@26 196 * 1.2.30beta01-04 13 10230 12.so.0.30[.0]
nuclear@26 197 * 1.0.38rc01-08 10 10038 10.so.0.38[.0]
nuclear@26 198 * 1.2.30rc01-08 13 10230 12.so.0.30[.0]
nuclear@26 199 * 1.0.38 10 10038 10.so.0.38[.0]
nuclear@26 200 * 1.2.30 13 10230 12.so.0.30[.0]
nuclear@26 201 * 1.0.39rc01-03 10 10039 10.so.0.39[.0]
nuclear@26 202 * 1.2.31rc01-03 13 10231 12.so.0.31[.0]
nuclear@26 203 * 1.0.39 10 10039 10.so.0.39[.0]
nuclear@26 204 * 1.2.31 13 10231 12.so.0.31[.0]
nuclear@26 205 * 1.2.32beta01-02 13 10232 12.so.0.32[.0]
nuclear@26 206 * 1.0.40rc01 10 10040 10.so.0.40[.0]
nuclear@26 207 * 1.2.32rc01 13 10232 12.so.0.32[.0]
nuclear@26 208 * 1.0.40 10 10040 10.so.0.40[.0]
nuclear@26 209 * 1.2.32 13 10232 12.so.0.32[.0]
nuclear@26 210 * 1.2.33beta01-02 13 10233 12.so.0.33[.0]
nuclear@26 211 * 1.2.33rc01-02 13 10233 12.so.0.33[.0]
nuclear@26 212 * 1.0.41rc01 10 10041 10.so.0.41[.0]
nuclear@26 213 * 1.2.33 13 10233 12.so.0.33[.0]
nuclear@26 214 * 1.0.41 10 10041 10.so.0.41[.0]
nuclear@26 215 *
nuclear@26 216 * Henceforth the source version will match the shared-library major
nuclear@26 217 * and minor numbers; the shared-library major version number will be
nuclear@26 218 * used for changes in backward compatibility, as it is intended. The
nuclear@26 219 * PNG_LIBPNG_VER macro, which is not used within libpng but is available
nuclear@26 220 * for applications, is an unsigned integer of the form xyyzz corresponding
nuclear@26 221 * to the source version x.y.z (leading zeros in y and z). Beta versions
nuclear@26 222 * were given the previous public release number plus a letter, until
nuclear@26 223 * version 1.0.6j; from then on they were given the upcoming public
nuclear@26 224 * release number plus "betaNN" or "rcNN".
nuclear@26 225 *
nuclear@26 226 * Binary incompatibility exists only when applications make direct access
nuclear@26 227 * to the info_ptr or png_ptr members through png.h, and the compiled
nuclear@26 228 * application is loaded with a different version of the library.
nuclear@26 229 *
nuclear@26 230 * DLLNUM will change each time there are forward or backward changes
nuclear@26 231 * in binary compatibility (e.g., when a new feature is added).
nuclear@26 232 *
nuclear@26 233 * See libpng.txt or libpng.3 for more information. The PNG specification
nuclear@26 234 * is available as a W3C Recommendation and as an ISO Specification,
nuclear@26 235 * <http://www.w3.org/TR/2003/REC-PNG-20031110/
nuclear@26 236 */
nuclear@26 237
nuclear@26 238 /*
nuclear@26 239 * COPYRIGHT NOTICE, DISCLAIMER, and LICENSE:
nuclear@26 240 *
nuclear@26 241 * If you modify libpng you may insert additional notices immediately following
nuclear@26 242 * this sentence.
nuclear@26 243 *
nuclear@26 244 * libpng versions 1.2.6, August 15, 2004, through 1.2.33, October 31, 2008, are
nuclear@26 245 * Copyright (c) 2004, 2006-2008 Glenn Randers-Pehrson, and are
nuclear@26 246 * distributed according to the same disclaimer and license as libpng-1.2.5
nuclear@26 247 * with the following individual added to the list of Contributing Authors:
nuclear@26 248 *
nuclear@26 249 * Cosmin Truta
nuclear@26 250 *
nuclear@26 251 * libpng versions 1.0.7, July 1, 2000, through 1.2.5, October 3, 2002, are
nuclear@26 252 * Copyright (c) 2000-2002 Glenn Randers-Pehrson, and are
nuclear@26 253 * distributed according to the same disclaimer and license as libpng-1.0.6
nuclear@26 254 * with the following individuals added to the list of Contributing Authors:
nuclear@26 255 *
nuclear@26 256 * Simon-Pierre Cadieux
nuclear@26 257 * Eric S. Raymond
nuclear@26 258 * Gilles Vollant
nuclear@26 259 *
nuclear@26 260 * and with the following additions to the disclaimer:
nuclear@26 261 *
nuclear@26 262 * There is no warranty against interference with your enjoyment of the
nuclear@26 263 * library or against infringement. There is no warranty that our
nuclear@26 264 * efforts or the library will fulfill any of your particular purposes
nuclear@26 265 * or needs. This library is provided with all faults, and the entire
nuclear@26 266 * risk of satisfactory quality, performance, accuracy, and effort is with
nuclear@26 267 * the user.
nuclear@26 268 *
nuclear@26 269 * libpng versions 0.97, January 1998, through 1.0.6, March 20, 2000, are
nuclear@26 270 * Copyright (c) 1998, 1999, 2000 Glenn Randers-Pehrson, and are
nuclear@26 271 * distributed according to the same disclaimer and license as libpng-0.96,
nuclear@26 272 * with the following individuals added to the list of Contributing Authors:
nuclear@26 273 *
nuclear@26 274 * Tom Lane
nuclear@26 275 * Glenn Randers-Pehrson
nuclear@26 276 * Willem van Schaik
nuclear@26 277 *
nuclear@26 278 * libpng versions 0.89, June 1996, through 0.96, May 1997, are
nuclear@26 279 * Copyright (c) 1996, 1997 Andreas Dilger
nuclear@26 280 * Distributed according to the same disclaimer and license as libpng-0.88,
nuclear@26 281 * with the following individuals added to the list of Contributing Authors:
nuclear@26 282 *
nuclear@26 283 * John Bowler
nuclear@26 284 * Kevin Bracey
nuclear@26 285 * Sam Bushell
nuclear@26 286 * Magnus Holmgren
nuclear@26 287 * Greg Roelofs
nuclear@26 288 * Tom Tanner
nuclear@26 289 *
nuclear@26 290 * libpng versions 0.5, May 1995, through 0.88, January 1996, are
nuclear@26 291 * Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.
nuclear@26 292 *
nuclear@26 293 * For the purposes of this copyright and license, "Contributing Authors"
nuclear@26 294 * is defined as the following set of individuals:
nuclear@26 295 *
nuclear@26 296 * Andreas Dilger
nuclear@26 297 * Dave Martindale
nuclear@26 298 * Guy Eric Schalnat
nuclear@26 299 * Paul Schmidt
nuclear@26 300 * Tim Wegner
nuclear@26 301 *
nuclear@26 302 * The PNG Reference Library is supplied "AS IS". The Contributing Authors
nuclear@26 303 * and Group 42, Inc. disclaim all warranties, expressed or implied,
nuclear@26 304 * including, without limitation, the warranties of merchantability and of
nuclear@26 305 * fitness for any purpose. The Contributing Authors and Group 42, Inc.
nuclear@26 306 * assume no liability for direct, indirect, incidental, special, exemplary,
nuclear@26 307 * or consequential damages, which may result from the use of the PNG
nuclear@26 308 * Reference Library, even if advised of the possibility of such damage.
nuclear@26 309 *
nuclear@26 310 * Permission is hereby granted to use, copy, modify, and distribute this
nuclear@26 311 * source code, or portions hereof, for any purpose, without fee, subject
nuclear@26 312 * to the following restrictions:
nuclear@26 313 *
nuclear@26 314 * 1. The origin of this source code must not be misrepresented.
nuclear@26 315 *
nuclear@26 316 * 2. Altered versions must be plainly marked as such and
nuclear@26 317 * must not be misrepresented as being the original source.
nuclear@26 318 *
nuclear@26 319 * 3. This Copyright notice may not be removed or altered from
nuclear@26 320 * any source or altered source distribution.
nuclear@26 321 *
nuclear@26 322 * The Contributing Authors and Group 42, Inc. specifically permit, without
nuclear@26 323 * fee, and encourage the use of this source code as a component to
nuclear@26 324 * supporting the PNG file format in commercial products. If you use this
nuclear@26 325 * source code in a product, acknowledgment is not required but would be
nuclear@26 326 * appreciated.
nuclear@26 327 */
nuclear@26 328
nuclear@26 329 /*
nuclear@26 330 * A "png_get_copyright" function is available, for convenient use in "about"
nuclear@26 331 * boxes and the like:
nuclear@26 332 *
nuclear@26 333 * printf("%s",png_get_copyright(NULL));
nuclear@26 334 *
nuclear@26 335 * Also, the PNG logo (in PNG format, of course) is supplied in the
nuclear@26 336 * files "pngbar.png" and "pngbar.jpg (88x31) and "pngnow.png" (98x31).
nuclear@26 337 */
nuclear@26 338
nuclear@26 339 /*
nuclear@26 340 * Libpng is OSI Certified Open Source Software. OSI Certified is a
nuclear@26 341 * certification mark of the Open Source Initiative.
nuclear@26 342 */
nuclear@26 343
nuclear@26 344 /*
nuclear@26 345 * The contributing authors would like to thank all those who helped
nuclear@26 346 * with testing, bug fixes, and patience. This wouldn't have been
nuclear@26 347 * possible without all of you.
nuclear@26 348 *
nuclear@26 349 * Thanks to Frank J. T. Wojcik for helping with the documentation.
nuclear@26 350 */
nuclear@26 351
nuclear@26 352 /*
nuclear@26 353 * Y2K compliance in libpng:
nuclear@26 354 * =========================
nuclear@26 355 *
nuclear@26 356 * October 31, 2008
nuclear@26 357 *
nuclear@26 358 * Since the PNG Development group is an ad-hoc body, we can't make
nuclear@26 359 * an official declaration.
nuclear@26 360 *
nuclear@26 361 * This is your unofficial assurance that libpng from version 0.71 and
nuclear@26 362 * upward through 1.2.33 are Y2K compliant. It is my belief that earlier
nuclear@26 363 * versions were also Y2K compliant.
nuclear@26 364 *
nuclear@26 365 * Libpng only has three year fields. One is a 2-byte unsigned integer
nuclear@26 366 * that will hold years up to 65535. The other two hold the date in text
nuclear@26 367 * format, and will hold years up to 9999.
nuclear@26 368 *
nuclear@26 369 * The integer is
nuclear@26 370 * "png_uint_16 year" in png_time_struct.
nuclear@26 371 *
nuclear@26 372 * The strings are
nuclear@26 373 * "png_charp time_buffer" in png_struct and
nuclear@26 374 * "near_time_buffer", which is a local character string in png.c.
nuclear@26 375 *
nuclear@26 376 * There are seven time-related functions:
nuclear@26 377 * png.c: png_convert_to_rfc_1123() in png.c
nuclear@26 378 * (formerly png_convert_to_rfc_1152() in error)
nuclear@26 379 * png_convert_from_struct_tm() in pngwrite.c, called in pngwrite.c
nuclear@26 380 * png_convert_from_time_t() in pngwrite.c
nuclear@26 381 * png_get_tIME() in pngget.c
nuclear@26 382 * png_handle_tIME() in pngrutil.c, called in pngread.c
nuclear@26 383 * png_set_tIME() in pngset.c
nuclear@26 384 * png_write_tIME() in pngwutil.c, called in pngwrite.c
nuclear@26 385 *
nuclear@26 386 * All handle dates properly in a Y2K environment. The
nuclear@26 387 * png_convert_from_time_t() function calls gmtime() to convert from system
nuclear@26 388 * clock time, which returns (year - 1900), which we properly convert to
nuclear@26 389 * the full 4-digit year. There is a possibility that applications using
nuclear@26 390 * libpng are not passing 4-digit years into the png_convert_to_rfc_1123()
nuclear@26 391 * function, or that they are incorrectly passing only a 2-digit year
nuclear@26 392 * instead of "year - 1900" into the png_convert_from_struct_tm() function,
nuclear@26 393 * but this is not under our control. The libpng documentation has always
nuclear@26 394 * stated that it works with 4-digit years, and the APIs have been
nuclear@26 395 * documented as such.
nuclear@26 396 *
nuclear@26 397 * The tIME chunk itself is also Y2K compliant. It uses a 2-byte unsigned
nuclear@26 398 * integer to hold the year, and can hold years as large as 65535.
nuclear@26 399 *
nuclear@26 400 * zlib, upon which libpng depends, is also Y2K compliant. It contains
nuclear@26 401 * no date-related code.
nuclear@26 402 *
nuclear@26 403 * Glenn Randers-Pehrson
nuclear@26 404 * libpng maintainer
nuclear@26 405 * PNG Development Group
nuclear@26 406 */
nuclear@26 407
nuclear@26 408 #ifndef PNG_H
nuclear@26 409 #define PNG_H
nuclear@26 410
nuclear@26 411 /* This is not the place to learn how to use libpng. The file libpng.txt
nuclear@26 412 * describes how to use libpng, and the file example.c summarizes it
nuclear@26 413 * with some code on which to build. This file is useful for looking
nuclear@26 414 * at the actual function definitions and structure components.
nuclear@26 415 */
nuclear@26 416
nuclear@26 417 /* Version information for png.h - this should match the version in png.c */
nuclear@26 418 #define PNG_LIBPNG_VER_STRING "1.2.33"
nuclear@26 419 #define PNG_HEADER_VERSION_STRING \
nuclear@26 420 " libpng version 1.2.33 - October 31, 2008\n"
nuclear@26 421
nuclear@26 422 #define PNG_LIBPNG_VER_SONUM 0
nuclear@26 423 #define PNG_LIBPNG_VER_DLLNUM 13
nuclear@26 424
nuclear@26 425 /* These should match the first 3 components of PNG_LIBPNG_VER_STRING: */
nuclear@26 426 #define PNG_LIBPNG_VER_MAJOR 1
nuclear@26 427 #define PNG_LIBPNG_VER_MINOR 2
nuclear@26 428 #define PNG_LIBPNG_VER_RELEASE 33
nuclear@26 429 /* This should match the numeric part of the final component of
nuclear@26 430 * PNG_LIBPNG_VER_STRING, omitting any leading zero: */
nuclear@26 431
nuclear@26 432 #define PNG_LIBPNG_VER_BUILD 0
nuclear@26 433
nuclear@26 434 /* Release Status */
nuclear@26 435 #define PNG_LIBPNG_BUILD_ALPHA 1
nuclear@26 436 #define PNG_LIBPNG_BUILD_BETA 2
nuclear@26 437 #define PNG_LIBPNG_BUILD_RC 3
nuclear@26 438 #define PNG_LIBPNG_BUILD_STABLE 4
nuclear@26 439 #define PNG_LIBPNG_BUILD_RELEASE_STATUS_MASK 7
nuclear@26 440
nuclear@26 441 /* Release-Specific Flags */
nuclear@26 442 #define PNG_LIBPNG_BUILD_PATCH 8 /* Can be OR'ed with
nuclear@26 443 PNG_LIBPNG_BUILD_STABLE only */
nuclear@26 444 #define PNG_LIBPNG_BUILD_PRIVATE 16 /* Cannot be OR'ed with
nuclear@26 445 PNG_LIBPNG_BUILD_SPECIAL */
nuclear@26 446 #define PNG_LIBPNG_BUILD_SPECIAL 32 /* Cannot be OR'ed with
nuclear@26 447 PNG_LIBPNG_BUILD_PRIVATE */
nuclear@26 448
nuclear@26 449 #define PNG_LIBPNG_BUILD_BASE_TYPE PNG_LIBPNG_BUILD_STABLE
nuclear@26 450
nuclear@26 451 /* Careful here. At one time, Guy wanted to use 082, but that would be octal.
nuclear@26 452 * We must not include leading zeros.
nuclear@26 453 * Versions 0.7 through 1.0.0 were in the range 0 to 100 here (only
nuclear@26 454 * version 1.0.0 was mis-numbered 100 instead of 10000). From
nuclear@26 455 * version 1.0.1 it's xxyyzz, where x=major, y=minor, z=release */
nuclear@26 456 #define PNG_LIBPNG_VER 10233 /* 1.2.33 */
nuclear@26 457
nuclear@26 458 #ifndef PNG_VERSION_INFO_ONLY
nuclear@26 459 /* include the compression library's header */
nuclear@26 460 #include "zlib.h"
nuclear@26 461 #endif
nuclear@26 462
nuclear@26 463 /* include all user configurable info, including optional assembler routines */
nuclear@26 464 #include "pngconf.h"
nuclear@26 465
nuclear@26 466 /*
nuclear@26 467 * Added at libpng-1.2.8 */
nuclear@26 468 /* Ref MSDN: Private as priority over Special
nuclear@26 469 * VS_FF_PRIVATEBUILD File *was not* built using standard release
nuclear@26 470 * procedures. If this value is given, the StringFileInfo block must
nuclear@26 471 * contain a PrivateBuild string.
nuclear@26 472 *
nuclear@26 473 * VS_FF_SPECIALBUILD File *was* built by the original company using
nuclear@26 474 * standard release procedures but is a variation of the standard
nuclear@26 475 * file of the same version number. If this value is given, the
nuclear@26 476 * StringFileInfo block must contain a SpecialBuild string.
nuclear@26 477 */
nuclear@26 478
nuclear@26 479 #if defined(PNG_USER_PRIVATEBUILD)
nuclear@26 480 # define PNG_LIBPNG_BUILD_TYPE \
nuclear@26 481 (PNG_LIBPNG_BUILD_BASE_TYPE | PNG_LIBPNG_BUILD_PRIVATE)
nuclear@26 482 #else
nuclear@26 483 # if defined(PNG_LIBPNG_SPECIALBUILD)
nuclear@26 484 # define PNG_LIBPNG_BUILD_TYPE \
nuclear@26 485 (PNG_LIBPNG_BUILD_BASE_TYPE | PNG_LIBPNG_BUILD_SPECIAL)
nuclear@26 486 # else
nuclear@26 487 # define PNG_LIBPNG_BUILD_TYPE (PNG_LIBPNG_BUILD_BASE_TYPE)
nuclear@26 488 # endif
nuclear@26 489 #endif
nuclear@26 490
nuclear@26 491 #ifndef PNG_VERSION_INFO_ONLY
nuclear@26 492
nuclear@26 493 /* Inhibit C++ name-mangling for libpng functions but not for system calls. */
nuclear@26 494 #ifdef __cplusplus
nuclear@26 495 extern "C" {
nuclear@26 496 #endif /* __cplusplus */
nuclear@26 497
nuclear@26 498 /* This file is arranged in several sections. The first section contains
nuclear@26 499 * structure and type definitions. The second section contains the external
nuclear@26 500 * library functions, while the third has the internal library functions,
nuclear@26 501 * which applications aren't expected to use directly.
nuclear@26 502 */
nuclear@26 503
nuclear@26 504 #ifndef PNG_NO_TYPECAST_NULL
nuclear@26 505 #define int_p_NULL (int *)NULL
nuclear@26 506 #define png_bytep_NULL (png_bytep)NULL
nuclear@26 507 #define png_bytepp_NULL (png_bytepp)NULL
nuclear@26 508 #define png_doublep_NULL (png_doublep)NULL
nuclear@26 509 #define png_error_ptr_NULL (png_error_ptr)NULL
nuclear@26 510 #define png_flush_ptr_NULL (png_flush_ptr)NULL
nuclear@26 511 #define png_free_ptr_NULL (png_free_ptr)NULL
nuclear@26 512 #define png_infopp_NULL (png_infopp)NULL
nuclear@26 513 #define png_malloc_ptr_NULL (png_malloc_ptr)NULL
nuclear@26 514 #define png_read_status_ptr_NULL (png_read_status_ptr)NULL
nuclear@26 515 #define png_rw_ptr_NULL (png_rw_ptr)NULL
nuclear@26 516 #define png_structp_NULL (png_structp)NULL
nuclear@26 517 #define png_uint_16p_NULL (png_uint_16p)NULL
nuclear@26 518 #define png_voidp_NULL (png_voidp)NULL
nuclear@26 519 #define png_write_status_ptr_NULL (png_write_status_ptr)NULL
nuclear@26 520 #else
nuclear@26 521 #define int_p_NULL NULL
nuclear@26 522 #define png_bytep_NULL NULL
nuclear@26 523 #define png_bytepp_NULL NULL
nuclear@26 524 #define png_doublep_NULL NULL
nuclear@26 525 #define png_error_ptr_NULL NULL
nuclear@26 526 #define png_flush_ptr_NULL NULL
nuclear@26 527 #define png_free_ptr_NULL NULL
nuclear@26 528 #define png_infopp_NULL NULL
nuclear@26 529 #define png_malloc_ptr_NULL NULL
nuclear@26 530 #define png_read_status_ptr_NULL NULL
nuclear@26 531 #define png_rw_ptr_NULL NULL
nuclear@26 532 #define png_structp_NULL NULL
nuclear@26 533 #define png_uint_16p_NULL NULL
nuclear@26 534 #define png_voidp_NULL NULL
nuclear@26 535 #define png_write_status_ptr_NULL NULL
nuclear@26 536 #endif
nuclear@26 537
nuclear@26 538 /* variables declared in png.c - only it needs to define PNG_NO_EXTERN */
nuclear@26 539 #if !defined(PNG_NO_EXTERN) || defined(PNG_ALWAYS_EXTERN)
nuclear@26 540 /* Version information for C files, stored in png.c. This had better match
nuclear@26 541 * the version above.
nuclear@26 542 */
nuclear@26 543 #ifdef PNG_USE_GLOBAL_ARRAYS
nuclear@26 544 PNG_EXPORT_VAR (PNG_CONST char) png_libpng_ver[18];
nuclear@26 545 /* need room for 99.99.99beta99z */
nuclear@26 546 #else
nuclear@26 547 #define png_libpng_ver png_get_header_ver(NULL)
nuclear@26 548 #endif
nuclear@26 549
nuclear@26 550 #ifdef PNG_USE_GLOBAL_ARRAYS
nuclear@26 551 /* This was removed in version 1.0.5c */
nuclear@26 552 /* Structures to facilitate easy interlacing. See png.c for more details */
nuclear@26 553 PNG_EXPORT_VAR (PNG_CONST int FARDATA) png_pass_start[7];
nuclear@26 554 PNG_EXPORT_VAR (PNG_CONST int FARDATA) png_pass_inc[7];
nuclear@26 555 PNG_EXPORT_VAR (PNG_CONST int FARDATA) png_pass_ystart[7];
nuclear@26 556 PNG_EXPORT_VAR (PNG_CONST int FARDATA) png_pass_yinc[7];
nuclear@26 557 PNG_EXPORT_VAR (PNG_CONST int FARDATA) png_pass_mask[7];
nuclear@26 558 PNG_EXPORT_VAR (PNG_CONST int FARDATA) png_pass_dsp_mask[7];
nuclear@26 559 /* This isn't currently used. If you need it, see png.c for more details.
nuclear@26 560 PNG_EXPORT_VAR (PNG_CONST int FARDATA) png_pass_height[7];
nuclear@26 561 */
nuclear@26 562 #endif
nuclear@26 563
nuclear@26 564 #endif /* PNG_NO_EXTERN */
nuclear@26 565
nuclear@26 566 /* Three color definitions. The order of the red, green, and blue, (and the
nuclear@26 567 * exact size) is not important, although the size of the fields need to
nuclear@26 568 * be png_byte or png_uint_16 (as defined below).
nuclear@26 569 */
nuclear@26 570 typedef struct png_color_struct
nuclear@26 571 {
nuclear@26 572 png_byte red;
nuclear@26 573 png_byte green;
nuclear@26 574 png_byte blue;
nuclear@26 575 } png_color;
nuclear@26 576 typedef png_color FAR * png_colorp;
nuclear@26 577 typedef png_color FAR * FAR * png_colorpp;
nuclear@26 578
nuclear@26 579 typedef struct png_color_16_struct
nuclear@26 580 {
nuclear@26 581 png_byte index; /* used for palette files */
nuclear@26 582 png_uint_16 red; /* for use in red green blue files */
nuclear@26 583 png_uint_16 green;
nuclear@26 584 png_uint_16 blue;
nuclear@26 585 png_uint_16 gray; /* for use in grayscale files */
nuclear@26 586 } png_color_16;
nuclear@26 587 typedef png_color_16 FAR * png_color_16p;
nuclear@26 588 typedef png_color_16 FAR * FAR * png_color_16pp;
nuclear@26 589
nuclear@26 590 typedef struct png_color_8_struct
nuclear@26 591 {
nuclear@26 592 png_byte red; /* for use in red green blue files */
nuclear@26 593 png_byte green;
nuclear@26 594 png_byte blue;
nuclear@26 595 png_byte gray; /* for use in grayscale files */
nuclear@26 596 png_byte alpha; /* for alpha channel files */
nuclear@26 597 } png_color_8;
nuclear@26 598 typedef png_color_8 FAR * png_color_8p;
nuclear@26 599 typedef png_color_8 FAR * FAR * png_color_8pp;
nuclear@26 600
nuclear@26 601 /*
nuclear@26 602 * The following two structures are used for the in-core representation
nuclear@26 603 * of sPLT chunks.
nuclear@26 604 */
nuclear@26 605 typedef struct png_sPLT_entry_struct
nuclear@26 606 {
nuclear@26 607 png_uint_16 red;
nuclear@26 608 png_uint_16 green;
nuclear@26 609 png_uint_16 blue;
nuclear@26 610 png_uint_16 alpha;
nuclear@26 611 png_uint_16 frequency;
nuclear@26 612 } png_sPLT_entry;
nuclear@26 613 typedef png_sPLT_entry FAR * png_sPLT_entryp;
nuclear@26 614 typedef png_sPLT_entry FAR * FAR * png_sPLT_entrypp;
nuclear@26 615
nuclear@26 616 /* When the depth of the sPLT palette is 8 bits, the color and alpha samples
nuclear@26 617 * occupy the LSB of their respective members, and the MSB of each member
nuclear@26 618 * is zero-filled. The frequency member always occupies the full 16 bits.
nuclear@26 619 */
nuclear@26 620
nuclear@26 621 typedef struct png_sPLT_struct
nuclear@26 622 {
nuclear@26 623 png_charp name; /* palette name */
nuclear@26 624 png_byte depth; /* depth of palette samples */
nuclear@26 625 png_sPLT_entryp entries; /* palette entries */
nuclear@26 626 png_int_32 nentries; /* number of palette entries */
nuclear@26 627 } png_sPLT_t;
nuclear@26 628 typedef png_sPLT_t FAR * png_sPLT_tp;
nuclear@26 629 typedef png_sPLT_t FAR * FAR * png_sPLT_tpp;
nuclear@26 630
nuclear@26 631 #ifdef PNG_TEXT_SUPPORTED
nuclear@26 632 /* png_text holds the contents of a text/ztxt/itxt chunk in a PNG file,
nuclear@26 633 * and whether that contents is compressed or not. The "key" field
nuclear@26 634 * points to a regular zero-terminated C string. The "text", "lang", and
nuclear@26 635 * "lang_key" fields can be regular C strings, empty strings, or NULL pointers.
nuclear@26 636 * However, the * structure returned by png_get_text() will always contain
nuclear@26 637 * regular zero-terminated C strings (possibly empty), never NULL pointers,
nuclear@26 638 * so they can be safely used in printf() and other string-handling functions.
nuclear@26 639 */
nuclear@26 640 typedef struct png_text_struct
nuclear@26 641 {
nuclear@26 642 int compression; /* compression value:
nuclear@26 643 -1: tEXt, none
nuclear@26 644 0: zTXt, deflate
nuclear@26 645 1: iTXt, none
nuclear@26 646 2: iTXt, deflate */
nuclear@26 647 png_charp key; /* keyword, 1-79 character description of "text" */
nuclear@26 648 png_charp text; /* comment, may be an empty string (ie "")
nuclear@26 649 or a NULL pointer */
nuclear@26 650 png_size_t text_length; /* length of the text string */
nuclear@26 651 #ifdef PNG_iTXt_SUPPORTED
nuclear@26 652 png_size_t itxt_length; /* length of the itxt string */
nuclear@26 653 png_charp lang; /* language code, 0-79 characters
nuclear@26 654 or a NULL pointer */
nuclear@26 655 png_charp lang_key; /* keyword translated UTF-8 string, 0 or more
nuclear@26 656 chars or a NULL pointer */
nuclear@26 657 #endif
nuclear@26 658 } png_text;
nuclear@26 659 typedef png_text FAR * png_textp;
nuclear@26 660 typedef png_text FAR * FAR * png_textpp;
nuclear@26 661 #endif
nuclear@26 662
nuclear@26 663 /* Supported compression types for text in PNG files (tEXt, and zTXt).
nuclear@26 664 * The values of the PNG_TEXT_COMPRESSION_ defines should NOT be changed. */
nuclear@26 665 #define PNG_TEXT_COMPRESSION_NONE_WR -3
nuclear@26 666 #define PNG_TEXT_COMPRESSION_zTXt_WR -2
nuclear@26 667 #define PNG_TEXT_COMPRESSION_NONE -1
nuclear@26 668 #define PNG_TEXT_COMPRESSION_zTXt 0
nuclear@26 669 #define PNG_ITXT_COMPRESSION_NONE 1
nuclear@26 670 #define PNG_ITXT_COMPRESSION_zTXt 2
nuclear@26 671 #define PNG_TEXT_COMPRESSION_LAST 3 /* Not a valid value */
nuclear@26 672
nuclear@26 673 /* png_time is a way to hold the time in an machine independent way.
nuclear@26 674 * Two conversions are provided, both from time_t and struct tm. There
nuclear@26 675 * is no portable way to convert to either of these structures, as far
nuclear@26 676 * as I know. If you know of a portable way, send it to me. As a side
nuclear@26 677 * note - PNG has always been Year 2000 compliant!
nuclear@26 678 */
nuclear@26 679 typedef struct png_time_struct
nuclear@26 680 {
nuclear@26 681 png_uint_16 year; /* full year, as in, 1995 */
nuclear@26 682 png_byte month; /* month of year, 1 - 12 */
nuclear@26 683 png_byte day; /* day of month, 1 - 31 */
nuclear@26 684 png_byte hour; /* hour of day, 0 - 23 */
nuclear@26 685 png_byte minute; /* minute of hour, 0 - 59 */
nuclear@26 686 png_byte second; /* second of minute, 0 - 60 (for leap seconds) */
nuclear@26 687 } png_time;
nuclear@26 688 typedef png_time FAR * png_timep;
nuclear@26 689 typedef png_time FAR * FAR * png_timepp;
nuclear@26 690
nuclear@26 691 #if defined(PNG_UNKNOWN_CHUNKS_SUPPORTED)
nuclear@26 692 /* png_unknown_chunk is a structure to hold queued chunks for which there is
nuclear@26 693 * no specific support. The idea is that we can use this to queue
nuclear@26 694 * up private chunks for output even though the library doesn't actually
nuclear@26 695 * know about their semantics.
nuclear@26 696 */
nuclear@26 697 #define PNG_CHUNK_NAME_LENGTH 5
nuclear@26 698 typedef struct png_unknown_chunk_t
nuclear@26 699 {
nuclear@26 700 png_byte name[PNG_CHUNK_NAME_LENGTH];
nuclear@26 701 png_byte *data;
nuclear@26 702 png_size_t size;
nuclear@26 703
nuclear@26 704 /* libpng-using applications should NOT directly modify this byte. */
nuclear@26 705 png_byte location; /* mode of operation at read time */
nuclear@26 706 }
nuclear@26 707 png_unknown_chunk;
nuclear@26 708 typedef png_unknown_chunk FAR * png_unknown_chunkp;
nuclear@26 709 typedef png_unknown_chunk FAR * FAR * png_unknown_chunkpp;
nuclear@26 710 #endif
nuclear@26 711
nuclear@26 712 /* png_info is a structure that holds the information in a PNG file so
nuclear@26 713 * that the application can find out the characteristics of the image.
nuclear@26 714 * If you are reading the file, this structure will tell you what is
nuclear@26 715 * in the PNG file. If you are writing the file, fill in the information
nuclear@26 716 * you want to put into the PNG file, then call png_write_info().
nuclear@26 717 * The names chosen should be very close to the PNG specification, so
nuclear@26 718 * consult that document for information about the meaning of each field.
nuclear@26 719 *
nuclear@26 720 * With libpng < 0.95, it was only possible to directly set and read the
nuclear@26 721 * the values in the png_info_struct, which meant that the contents and
nuclear@26 722 * order of the values had to remain fixed. With libpng 0.95 and later,
nuclear@26 723 * however, there are now functions that abstract the contents of
nuclear@26 724 * png_info_struct from the application, so this makes it easier to use
nuclear@26 725 * libpng with dynamic libraries, and even makes it possible to use
nuclear@26 726 * libraries that don't have all of the libpng ancillary chunk-handing
nuclear@26 727 * functionality.
nuclear@26 728 *
nuclear@26 729 * In any case, the order of the parameters in png_info_struct should NOT
nuclear@26 730 * be changed for as long as possible to keep compatibility with applications
nuclear@26 731 * that use the old direct-access method with png_info_struct.
nuclear@26 732 *
nuclear@26 733 * The following members may have allocated storage attached that should be
nuclear@26 734 * cleaned up before the structure is discarded: palette, trans, text,
nuclear@26 735 * pcal_purpose, pcal_units, pcal_params, hist, iccp_name, iccp_profile,
nuclear@26 736 * splt_palettes, scal_unit, row_pointers, and unknowns. By default, these
nuclear@26 737 * are automatically freed when the info structure is deallocated, if they were
nuclear@26 738 * allocated internally by libpng. This behavior can be changed by means
nuclear@26 739 * of the png_data_freer() function.
nuclear@26 740 *
nuclear@26 741 * More allocation details: all the chunk-reading functions that
nuclear@26 742 * change these members go through the corresponding png_set_*
nuclear@26 743 * functions. A function to clear these members is available: see
nuclear@26 744 * png_free_data(). The png_set_* functions do not depend on being
nuclear@26 745 * able to point info structure members to any of the storage they are
nuclear@26 746 * passed (they make their own copies), EXCEPT that the png_set_text
nuclear@26 747 * functions use the same storage passed to them in the text_ptr or
nuclear@26 748 * itxt_ptr structure argument, and the png_set_rows and png_set_unknowns
nuclear@26 749 * functions do not make their own copies.
nuclear@26 750 */
nuclear@26 751 typedef struct png_info_struct
nuclear@26 752 {
nuclear@26 753 /* the following are necessary for every PNG file */
nuclear@26 754 png_uint_32 width; /* width of image in pixels (from IHDR) */
nuclear@26 755 png_uint_32 height; /* height of image in pixels (from IHDR) */
nuclear@26 756 png_uint_32 valid; /* valid chunk data (see PNG_INFO_ below) */
nuclear@26 757 png_uint_32 rowbytes; /* bytes needed to hold an untransformed row */
nuclear@26 758 png_colorp palette; /* array of color values (valid & PNG_INFO_PLTE) */
nuclear@26 759 png_uint_16 num_palette; /* number of color entries in "palette" (PLTE) */
nuclear@26 760 png_uint_16 num_trans; /* number of transparent palette color (tRNS) */
nuclear@26 761 png_byte bit_depth; /* 1, 2, 4, 8, or 16 bits/channel (from IHDR) */
nuclear@26 762 png_byte color_type; /* see PNG_COLOR_TYPE_ below (from IHDR) */
nuclear@26 763 /* The following three should have been named *_method not *_type */
nuclear@26 764 png_byte compression_type; /* must be PNG_COMPRESSION_TYPE_BASE (IHDR) */
nuclear@26 765 png_byte filter_type; /* must be PNG_FILTER_TYPE_BASE (from IHDR) */
nuclear@26 766 png_byte interlace_type; /* One of PNG_INTERLACE_NONE, PNG_INTERLACE_ADAM7 */
nuclear@26 767
nuclear@26 768 /* The following is informational only on read, and not used on writes. */
nuclear@26 769 png_byte channels; /* number of data channels per pixel (1, 2, 3, 4) */
nuclear@26 770 png_byte pixel_depth; /* number of bits per pixel */
nuclear@26 771 png_byte spare_byte; /* to align the data, and for future use */
nuclear@26 772 png_byte signature[8]; /* magic bytes read by libpng from start of file */
nuclear@26 773
nuclear@26 774 /* The rest of the data is optional. If you are reading, check the
nuclear@26 775 * valid field to see if the information in these are valid. If you
nuclear@26 776 * are writing, set the valid field to those chunks you want written,
nuclear@26 777 * and initialize the appropriate fields below.
nuclear@26 778 */
nuclear@26 779
nuclear@26 780 #if defined(PNG_gAMA_SUPPORTED) && defined(PNG_FLOATING_POINT_SUPPORTED)
nuclear@26 781 /* The gAMA chunk describes the gamma characteristics of the system
nuclear@26 782 * on which the image was created, normally in the range [1.0, 2.5].
nuclear@26 783 * Data is valid if (valid & PNG_INFO_gAMA) is non-zero.
nuclear@26 784 */
nuclear@26 785 float gamma; /* gamma value of image, if (valid & PNG_INFO_gAMA) */
nuclear@26 786 #endif
nuclear@26 787
nuclear@26 788 #if defined(PNG_sRGB_SUPPORTED)
nuclear@26 789 /* GR-P, 0.96a */
nuclear@26 790 /* Data valid if (valid & PNG_INFO_sRGB) non-zero. */
nuclear@26 791 png_byte srgb_intent; /* sRGB rendering intent [0, 1, 2, or 3] */
nuclear@26 792 #endif
nuclear@26 793
nuclear@26 794 #if defined(PNG_TEXT_SUPPORTED)
nuclear@26 795 /* The tEXt, and zTXt chunks contain human-readable textual data in
nuclear@26 796 * uncompressed, compressed, and optionally compressed forms, respectively.
nuclear@26 797 * The data in "text" is an array of pointers to uncompressed,
nuclear@26 798 * null-terminated C strings. Each chunk has a keyword that describes the
nuclear@26 799 * textual data contained in that chunk. Keywords are not required to be
nuclear@26 800 * unique, and the text string may be empty. Any number of text chunks may
nuclear@26 801 * be in an image.
nuclear@26 802 */
nuclear@26 803 int num_text; /* number of comments read/to write */
nuclear@26 804 int max_text; /* current size of text array */
nuclear@26 805 png_textp text; /* array of comments read/to write */
nuclear@26 806 #endif /* PNG_TEXT_SUPPORTED */
nuclear@26 807
nuclear@26 808 #if defined(PNG_tIME_SUPPORTED)
nuclear@26 809 /* The tIME chunk holds the last time the displayed image data was
nuclear@26 810 * modified. See the png_time struct for the contents of this struct.
nuclear@26 811 */
nuclear@26 812 png_time mod_time;
nuclear@26 813 #endif
nuclear@26 814
nuclear@26 815 #if defined(PNG_sBIT_SUPPORTED)
nuclear@26 816 /* The sBIT chunk specifies the number of significant high-order bits
nuclear@26 817 * in the pixel data. Values are in the range [1, bit_depth], and are
nuclear@26 818 * only specified for the channels in the pixel data. The contents of
nuclear@26 819 * the low-order bits is not specified. Data is valid if
nuclear@26 820 * (valid & PNG_INFO_sBIT) is non-zero.
nuclear@26 821 */
nuclear@26 822 png_color_8 sig_bit; /* significant bits in color channels */
nuclear@26 823 #endif
nuclear@26 824
nuclear@26 825 #if defined(PNG_tRNS_SUPPORTED) || defined(PNG_READ_EXPAND_SUPPORTED) || \
nuclear@26 826 defined(PNG_READ_BACKGROUND_SUPPORTED)
nuclear@26 827 /* The tRNS chunk supplies transparency data for paletted images and
nuclear@26 828 * other image types that don't need a full alpha channel. There are
nuclear@26 829 * "num_trans" transparency values for a paletted image, stored in the
nuclear@26 830 * same order as the palette colors, starting from index 0. Values
nuclear@26 831 * for the data are in the range [0, 255], ranging from fully transparent
nuclear@26 832 * to fully opaque, respectively. For non-paletted images, there is a
nuclear@26 833 * single color specified that should be treated as fully transparent.
nuclear@26 834 * Data is valid if (valid & PNG_INFO_tRNS) is non-zero.
nuclear@26 835 */
nuclear@26 836 png_bytep trans; /* transparent values for paletted image */
nuclear@26 837 png_color_16 trans_values; /* transparent color for non-palette image */
nuclear@26 838 #endif
nuclear@26 839
nuclear@26 840 #if defined(PNG_bKGD_SUPPORTED) || defined(PNG_READ_BACKGROUND_SUPPORTED)
nuclear@26 841 /* The bKGD chunk gives the suggested image background color if the
nuclear@26 842 * display program does not have its own background color and the image
nuclear@26 843 * is needs to composited onto a background before display. The colors
nuclear@26 844 * in "background" are normally in the same color space/depth as the
nuclear@26 845 * pixel data. Data is valid if (valid & PNG_INFO_bKGD) is non-zero.
nuclear@26 846 */
nuclear@26 847 png_color_16 background;
nuclear@26 848 #endif
nuclear@26 849
nuclear@26 850 #if defined(PNG_oFFs_SUPPORTED)
nuclear@26 851 /* The oFFs chunk gives the offset in "offset_unit_type" units rightwards
nuclear@26 852 * and downwards from the top-left corner of the display, page, or other
nuclear@26 853 * application-specific co-ordinate space. See the PNG_OFFSET_ defines
nuclear@26 854 * below for the unit types. Valid if (valid & PNG_INFO_oFFs) non-zero.
nuclear@26 855 */
nuclear@26 856 png_int_32 x_offset; /* x offset on page */
nuclear@26 857 png_int_32 y_offset; /* y offset on page */
nuclear@26 858 png_byte offset_unit_type; /* offset units type */
nuclear@26 859 #endif
nuclear@26 860
nuclear@26 861 #if defined(PNG_pHYs_SUPPORTED)
nuclear@26 862 /* The pHYs chunk gives the physical pixel density of the image for
nuclear@26 863 * display or printing in "phys_unit_type" units (see PNG_RESOLUTION_
nuclear@26 864 * defines below). Data is valid if (valid & PNG_INFO_pHYs) is non-zero.
nuclear@26 865 */
nuclear@26 866 png_uint_32 x_pixels_per_unit; /* horizontal pixel density */
nuclear@26 867 png_uint_32 y_pixels_per_unit; /* vertical pixel density */
nuclear@26 868 png_byte phys_unit_type; /* resolution type (see PNG_RESOLUTION_ below) */
nuclear@26 869 #endif
nuclear@26 870
nuclear@26 871 #if defined(PNG_hIST_SUPPORTED)
nuclear@26 872 /* The hIST chunk contains the relative frequency or importance of the
nuclear@26 873 * various palette entries, so that a viewer can intelligently select a
nuclear@26 874 * reduced-color palette, if required. Data is an array of "num_palette"
nuclear@26 875 * values in the range [0,65535]. Data valid if (valid & PNG_INFO_hIST)
nuclear@26 876 * is non-zero.
nuclear@26 877 */
nuclear@26 878 png_uint_16p hist;
nuclear@26 879 #endif
nuclear@26 880
nuclear@26 881 #ifdef PNG_cHRM_SUPPORTED
nuclear@26 882 /* The cHRM chunk describes the CIE color characteristics of the monitor
nuclear@26 883 * on which the PNG was created. This data allows the viewer to do gamut
nuclear@26 884 * mapping of the input image to ensure that the viewer sees the same
nuclear@26 885 * colors in the image as the creator. Values are in the range
nuclear@26 886 * [0.0, 0.8]. Data valid if (valid & PNG_INFO_cHRM) non-zero.
nuclear@26 887 */
nuclear@26 888 #ifdef PNG_FLOATING_POINT_SUPPORTED
nuclear@26 889 float x_white;
nuclear@26 890 float y_white;
nuclear@26 891 float x_red;
nuclear@26 892 float y_red;
nuclear@26 893 float x_green;
nuclear@26 894 float y_green;
nuclear@26 895 float x_blue;
nuclear@26 896 float y_blue;
nuclear@26 897 #endif
nuclear@26 898 #endif
nuclear@26 899
nuclear@26 900 #if defined(PNG_pCAL_SUPPORTED)
nuclear@26 901 /* The pCAL chunk describes a transformation between the stored pixel
nuclear@26 902 * values and original physical data values used to create the image.
nuclear@26 903 * The integer range [0, 2^bit_depth - 1] maps to the floating-point
nuclear@26 904 * range given by [pcal_X0, pcal_X1], and are further transformed by a
nuclear@26 905 * (possibly non-linear) transformation function given by "pcal_type"
nuclear@26 906 * and "pcal_params" into "pcal_units". Please see the PNG_EQUATION_
nuclear@26 907 * defines below, and the PNG-Group's PNG extensions document for a
nuclear@26 908 * complete description of the transformations and how they should be
nuclear@26 909 * implemented, and for a description of the ASCII parameter strings.
nuclear@26 910 * Data values are valid if (valid & PNG_INFO_pCAL) non-zero.
nuclear@26 911 */
nuclear@26 912 png_charp pcal_purpose; /* pCAL chunk description string */
nuclear@26 913 png_int_32 pcal_X0; /* minimum value */
nuclear@26 914 png_int_32 pcal_X1; /* maximum value */
nuclear@26 915 png_charp pcal_units; /* Latin-1 string giving physical units */
nuclear@26 916 png_charpp pcal_params; /* ASCII strings containing parameter values */
nuclear@26 917 png_byte pcal_type; /* equation type (see PNG_EQUATION_ below) */
nuclear@26 918 png_byte pcal_nparams; /* number of parameters given in pcal_params */
nuclear@26 919 #endif
nuclear@26 920
nuclear@26 921 /* New members added in libpng-1.0.6 */
nuclear@26 922 #ifdef PNG_FREE_ME_SUPPORTED
nuclear@26 923 png_uint_32 free_me; /* flags items libpng is responsible for freeing */
nuclear@26 924 #endif
nuclear@26 925
nuclear@26 926 #if defined(PNG_UNKNOWN_CHUNKS_SUPPORTED)
nuclear@26 927 /* storage for unknown chunks that the library doesn't recognize. */
nuclear@26 928 png_unknown_chunkp unknown_chunks;
nuclear@26 929 png_size_t unknown_chunks_num;
nuclear@26 930 #endif
nuclear@26 931
nuclear@26 932 #if defined(PNG_iCCP_SUPPORTED)
nuclear@26 933 /* iCCP chunk data. */
nuclear@26 934 png_charp iccp_name; /* profile name */
nuclear@26 935 png_charp iccp_profile; /* International Color Consortium profile data */
nuclear@26 936 /* Note to maintainer: should be png_bytep */
nuclear@26 937 png_uint_32 iccp_proflen; /* ICC profile data length */
nuclear@26 938 png_byte iccp_compression; /* Always zero */
nuclear@26 939 #endif
nuclear@26 940
nuclear@26 941 #if defined(PNG_sPLT_SUPPORTED)
nuclear@26 942 /* data on sPLT chunks (there may be more than one). */
nuclear@26 943 png_sPLT_tp splt_palettes;
nuclear@26 944 png_uint_32 splt_palettes_num;
nuclear@26 945 #endif
nuclear@26 946
nuclear@26 947 #if defined(PNG_sCAL_SUPPORTED)
nuclear@26 948 /* The sCAL chunk describes the actual physical dimensions of the
nuclear@26 949 * subject matter of the graphic. The chunk contains a unit specification
nuclear@26 950 * a byte value, and two ASCII strings representing floating-point
nuclear@26 951 * values. The values are width and height corresponsing to one pixel
nuclear@26 952 * in the image. This external representation is converted to double
nuclear@26 953 * here. Data values are valid if (valid & PNG_INFO_sCAL) is non-zero.
nuclear@26 954 */
nuclear@26 955 png_byte scal_unit; /* unit of physical scale */
nuclear@26 956 #ifdef PNG_FLOATING_POINT_SUPPORTED
nuclear@26 957 double scal_pixel_width; /* width of one pixel */
nuclear@26 958 double scal_pixel_height; /* height of one pixel */
nuclear@26 959 #endif
nuclear@26 960 #ifdef PNG_FIXED_POINT_SUPPORTED
nuclear@26 961 png_charp scal_s_width; /* string containing height */
nuclear@26 962 png_charp scal_s_height; /* string containing width */
nuclear@26 963 #endif
nuclear@26 964 #endif
nuclear@26 965
nuclear@26 966 #if defined(PNG_INFO_IMAGE_SUPPORTED)
nuclear@26 967 /* Memory has been allocated if (valid & PNG_ALLOCATED_INFO_ROWS) non-zero */
nuclear@26 968 /* Data valid if (valid & PNG_INFO_IDAT) non-zero */
nuclear@26 969 png_bytepp row_pointers; /* the image bits */
nuclear@26 970 #endif
nuclear@26 971
nuclear@26 972 #if defined(PNG_FIXED_POINT_SUPPORTED) && defined(PNG_gAMA_SUPPORTED)
nuclear@26 973 png_fixed_point int_gamma; /* gamma of image, if (valid & PNG_INFO_gAMA) */
nuclear@26 974 #endif
nuclear@26 975
nuclear@26 976 #if defined(PNG_cHRM_SUPPORTED) && defined(PNG_FIXED_POINT_SUPPORTED)
nuclear@26 977 png_fixed_point int_x_white;
nuclear@26 978 png_fixed_point int_y_white;
nuclear@26 979 png_fixed_point int_x_red;
nuclear@26 980 png_fixed_point int_y_red;
nuclear@26 981 png_fixed_point int_x_green;
nuclear@26 982 png_fixed_point int_y_green;
nuclear@26 983 png_fixed_point int_x_blue;
nuclear@26 984 png_fixed_point int_y_blue;
nuclear@26 985 #endif
nuclear@26 986
nuclear@26 987 } png_info;
nuclear@26 988
nuclear@26 989 typedef png_info FAR * png_infop;
nuclear@26 990 typedef png_info FAR * FAR * png_infopp;
nuclear@26 991
nuclear@26 992 /* Maximum positive integer used in PNG is (2^31)-1 */
nuclear@26 993 #define PNG_UINT_31_MAX ((png_uint_32)0x7fffffffL)
nuclear@26 994 #define PNG_UINT_32_MAX ((png_uint_32)(-1))
nuclear@26 995 #define PNG_SIZE_MAX ((png_size_t)(-1))
nuclear@26 996 #if defined(PNG_1_0_X) || defined (PNG_1_2_X)
nuclear@26 997 /* PNG_MAX_UINT is deprecated; use PNG_UINT_31_MAX instead. */
nuclear@26 998 #define PNG_MAX_UINT PNG_UINT_31_MAX
nuclear@26 999 #endif
nuclear@26 1000
nuclear@26 1001 /* These describe the color_type field in png_info. */
nuclear@26 1002 /* color type masks */
nuclear@26 1003 #define PNG_COLOR_MASK_PALETTE 1
nuclear@26 1004 #define PNG_COLOR_MASK_COLOR 2
nuclear@26 1005 #define PNG_COLOR_MASK_ALPHA 4
nuclear@26 1006
nuclear@26 1007 /* color types. Note that not all combinations are legal */
nuclear@26 1008 #define PNG_COLOR_TYPE_GRAY 0
nuclear@26 1009 #define PNG_COLOR_TYPE_PALETTE (PNG_COLOR_MASK_COLOR | PNG_COLOR_MASK_PALETTE)
nuclear@26 1010 #define PNG_COLOR_TYPE_RGB (PNG_COLOR_MASK_COLOR)
nuclear@26 1011 #define PNG_COLOR_TYPE_RGB_ALPHA (PNG_COLOR_MASK_COLOR | PNG_COLOR_MASK_ALPHA)
nuclear@26 1012 #define PNG_COLOR_TYPE_GRAY_ALPHA (PNG_COLOR_MASK_ALPHA)
nuclear@26 1013 /* aliases */
nuclear@26 1014 #define PNG_COLOR_TYPE_RGBA PNG_COLOR_TYPE_RGB_ALPHA
nuclear@26 1015 #define PNG_COLOR_TYPE_GA PNG_COLOR_TYPE_GRAY_ALPHA
nuclear@26 1016
nuclear@26 1017 /* This is for compression type. PNG 1.0-1.2 only define the single type. */
nuclear@26 1018 #define PNG_COMPRESSION_TYPE_BASE 0 /* Deflate method 8, 32K window */
nuclear@26 1019 #define PNG_COMPRESSION_TYPE_DEFAULT PNG_COMPRESSION_TYPE_BASE
nuclear@26 1020
nuclear@26 1021 /* This is for filter type. PNG 1.0-1.2 only define the single type. */
nuclear@26 1022 #define PNG_FILTER_TYPE_BASE 0 /* Single row per-byte filtering */
nuclear@26 1023 #define PNG_INTRAPIXEL_DIFFERENCING 64 /* Used only in MNG datastreams */
nuclear@26 1024 #define PNG_FILTER_TYPE_DEFAULT PNG_FILTER_TYPE_BASE
nuclear@26 1025
nuclear@26 1026 /* These are for the interlacing type. These values should NOT be changed. */
nuclear@26 1027 #define PNG_INTERLACE_NONE 0 /* Non-interlaced image */
nuclear@26 1028 #define PNG_INTERLACE_ADAM7 1 /* Adam7 interlacing */
nuclear@26 1029 #define PNG_INTERLACE_LAST 2 /* Not a valid value */
nuclear@26 1030
nuclear@26 1031 /* These are for the oFFs chunk. These values should NOT be changed. */
nuclear@26 1032 #define PNG_OFFSET_PIXEL 0 /* Offset in pixels */
nuclear@26 1033 #define PNG_OFFSET_MICROMETER 1 /* Offset in micrometers (1/10^6 meter) */
nuclear@26 1034 #define PNG_OFFSET_LAST 2 /* Not a valid value */
nuclear@26 1035
nuclear@26 1036 /* These are for the pCAL chunk. These values should NOT be changed. */
nuclear@26 1037 #define PNG_EQUATION_LINEAR 0 /* Linear transformation */
nuclear@26 1038 #define PNG_EQUATION_BASE_E 1 /* Exponential base e transform */
nuclear@26 1039 #define PNG_EQUATION_ARBITRARY 2 /* Arbitrary base exponential transform */
nuclear@26 1040 #define PNG_EQUATION_HYPERBOLIC 3 /* Hyperbolic sine transformation */
nuclear@26 1041 #define PNG_EQUATION_LAST 4 /* Not a valid value */
nuclear@26 1042
nuclear@26 1043 /* These are for the sCAL chunk. These values should NOT be changed. */
nuclear@26 1044 #define PNG_SCALE_UNKNOWN 0 /* unknown unit (image scale) */
nuclear@26 1045 #define PNG_SCALE_METER 1 /* meters per pixel */
nuclear@26 1046 #define PNG_SCALE_RADIAN 2 /* radians per pixel */
nuclear@26 1047 #define PNG_SCALE_LAST 3 /* Not a valid value */
nuclear@26 1048
nuclear@26 1049 /* These are for the pHYs chunk. These values should NOT be changed. */
nuclear@26 1050 #define PNG_RESOLUTION_UNKNOWN 0 /* pixels/unknown unit (aspect ratio) */
nuclear@26 1051 #define PNG_RESOLUTION_METER 1 /* pixels/meter */
nuclear@26 1052 #define PNG_RESOLUTION_LAST 2 /* Not a valid value */
nuclear@26 1053
nuclear@26 1054 /* These are for the sRGB chunk. These values should NOT be changed. */
nuclear@26 1055 #define PNG_sRGB_INTENT_PERCEPTUAL 0
nuclear@26 1056 #define PNG_sRGB_INTENT_RELATIVE 1
nuclear@26 1057 #define PNG_sRGB_INTENT_SATURATION 2
nuclear@26 1058 #define PNG_sRGB_INTENT_ABSOLUTE 3
nuclear@26 1059 #define PNG_sRGB_INTENT_LAST 4 /* Not a valid value */
nuclear@26 1060
nuclear@26 1061 /* This is for text chunks */
nuclear@26 1062 #define PNG_KEYWORD_MAX_LENGTH 79
nuclear@26 1063
nuclear@26 1064 /* Maximum number of entries in PLTE/sPLT/tRNS arrays */
nuclear@26 1065 #define PNG_MAX_PALETTE_LENGTH 256
nuclear@26 1066
nuclear@26 1067 /* These determine if an ancillary chunk's data has been successfully read
nuclear@26 1068 * from the PNG header, or if the application has filled in the corresponding
nuclear@26 1069 * data in the info_struct to be written into the output file. The values
nuclear@26 1070 * of the PNG_INFO_<chunk> defines should NOT be changed.
nuclear@26 1071 */
nuclear@26 1072 #define PNG_INFO_gAMA 0x0001
nuclear@26 1073 #define PNG_INFO_sBIT 0x0002
nuclear@26 1074 #define PNG_INFO_cHRM 0x0004
nuclear@26 1075 #define PNG_INFO_PLTE 0x0008
nuclear@26 1076 #define PNG_INFO_tRNS 0x0010
nuclear@26 1077 #define PNG_INFO_bKGD 0x0020
nuclear@26 1078 #define PNG_INFO_hIST 0x0040
nuclear@26 1079 #define PNG_INFO_pHYs 0x0080
nuclear@26 1080 #define PNG_INFO_oFFs 0x0100
nuclear@26 1081 #define PNG_INFO_tIME 0x0200
nuclear@26 1082 #define PNG_INFO_pCAL 0x0400
nuclear@26 1083 #define PNG_INFO_sRGB 0x0800 /* GR-P, 0.96a */
nuclear@26 1084 #define PNG_INFO_iCCP 0x1000 /* ESR, 1.0.6 */
nuclear@26 1085 #define PNG_INFO_sPLT 0x2000 /* ESR, 1.0.6 */
nuclear@26 1086 #define PNG_INFO_sCAL 0x4000 /* ESR, 1.0.6 */
nuclear@26 1087 #define PNG_INFO_IDAT 0x8000L /* ESR, 1.0.6 */
nuclear@26 1088
nuclear@26 1089 /* This is used for the transformation routines, as some of them
nuclear@26 1090 * change these values for the row. It also should enable using
nuclear@26 1091 * the routines for other purposes.
nuclear@26 1092 */
nuclear@26 1093 typedef struct png_row_info_struct
nuclear@26 1094 {
nuclear@26 1095 png_uint_32 width; /* width of row */
nuclear@26 1096 png_uint_32 rowbytes; /* number of bytes in row */
nuclear@26 1097 png_byte color_type; /* color type of row */
nuclear@26 1098 png_byte bit_depth; /* bit depth of row */
nuclear@26 1099 png_byte channels; /* number of channels (1, 2, 3, or 4) */
nuclear@26 1100 png_byte pixel_depth; /* bits per pixel (depth * channels) */
nuclear@26 1101 } png_row_info;
nuclear@26 1102
nuclear@26 1103 typedef png_row_info FAR * png_row_infop;
nuclear@26 1104 typedef png_row_info FAR * FAR * png_row_infopp;
nuclear@26 1105
nuclear@26 1106 /* These are the function types for the I/O functions and for the functions
nuclear@26 1107 * that allow the user to override the default I/O functions with his or her
nuclear@26 1108 * own. The png_error_ptr type should match that of user-supplied warning
nuclear@26 1109 * and error functions, while the png_rw_ptr type should match that of the
nuclear@26 1110 * user read/write data functions.
nuclear@26 1111 */
nuclear@26 1112 typedef struct png_struct_def png_struct;
nuclear@26 1113 typedef png_struct FAR * png_structp;
nuclear@26 1114
nuclear@26 1115 typedef void (PNGAPI *png_error_ptr) PNGARG((png_structp, png_const_charp));
nuclear@26 1116 typedef void (PNGAPI *png_rw_ptr) PNGARG((png_structp, png_bytep, png_size_t));
nuclear@26 1117 typedef void (PNGAPI *png_flush_ptr) PNGARG((png_structp));
nuclear@26 1118 typedef void (PNGAPI *png_read_status_ptr) PNGARG((png_structp, png_uint_32,
nuclear@26 1119 int));
nuclear@26 1120 typedef void (PNGAPI *png_write_status_ptr) PNGARG((png_structp, png_uint_32,
nuclear@26 1121 int));
nuclear@26 1122
nuclear@26 1123 #ifdef PNG_PROGRESSIVE_READ_SUPPORTED
nuclear@26 1124 typedef void (PNGAPI *png_progressive_info_ptr) PNGARG((png_structp, png_infop));
nuclear@26 1125 typedef void (PNGAPI *png_progressive_end_ptr) PNGARG((png_structp, png_infop));
nuclear@26 1126 typedef void (PNGAPI *png_progressive_row_ptr) PNGARG((png_structp, png_bytep,
nuclear@26 1127 png_uint_32, int));
nuclear@26 1128 #endif
nuclear@26 1129
nuclear@26 1130 #if defined(PNG_READ_USER_TRANSFORM_SUPPORTED) || \
nuclear@26 1131 defined(PNG_WRITE_USER_TRANSFORM_SUPPORTED) || \
nuclear@26 1132 defined(PNG_LEGACY_SUPPORTED)
nuclear@26 1133 typedef void (PNGAPI *png_user_transform_ptr) PNGARG((png_structp,
nuclear@26 1134 png_row_infop, png_bytep));
nuclear@26 1135 #endif
nuclear@26 1136
nuclear@26 1137 #if defined(PNG_USER_CHUNKS_SUPPORTED)
nuclear@26 1138 typedef int (PNGAPI *png_user_chunk_ptr) PNGARG((png_structp, png_unknown_chunkp));
nuclear@26 1139 #endif
nuclear@26 1140 #if defined(PNG_UNKNOWN_CHUNKS_SUPPORTED)
nuclear@26 1141 typedef void (PNGAPI *png_unknown_chunk_ptr) PNGARG((png_structp));
nuclear@26 1142 #endif
nuclear@26 1143
nuclear@26 1144 /* Transform masks for the high-level interface */
nuclear@26 1145 #define PNG_TRANSFORM_IDENTITY 0x0000 /* read and write */
nuclear@26 1146 #define PNG_TRANSFORM_STRIP_16 0x0001 /* read only */
nuclear@26 1147 #define PNG_TRANSFORM_STRIP_ALPHA 0x0002 /* read only */
nuclear@26 1148 #define PNG_TRANSFORM_PACKING 0x0004 /* read and write */
nuclear@26 1149 #define PNG_TRANSFORM_PACKSWAP 0x0008 /* read and write */
nuclear@26 1150 #define PNG_TRANSFORM_EXPAND 0x0010 /* read only */
nuclear@26 1151 #define PNG_TRANSFORM_INVERT_MONO 0x0020 /* read and write */
nuclear@26 1152 #define PNG_TRANSFORM_SHIFT 0x0040 /* read and write */
nuclear@26 1153 #define PNG_TRANSFORM_BGR 0x0080 /* read and write */
nuclear@26 1154 #define PNG_TRANSFORM_SWAP_ALPHA 0x0100 /* read and write */
nuclear@26 1155 #define PNG_TRANSFORM_SWAP_ENDIAN 0x0200 /* read and write */
nuclear@26 1156 #define PNG_TRANSFORM_INVERT_ALPHA 0x0400 /* read and write */
nuclear@26 1157 #define PNG_TRANSFORM_STRIP_FILLER 0x0800 /* WRITE only */
nuclear@26 1158
nuclear@26 1159 /* Flags for MNG supported features */
nuclear@26 1160 #define PNG_FLAG_MNG_EMPTY_PLTE 0x01
nuclear@26 1161 #define PNG_FLAG_MNG_FILTER_64 0x04
nuclear@26 1162 #define PNG_ALL_MNG_FEATURES 0x05
nuclear@26 1163
nuclear@26 1164 typedef png_voidp (*png_malloc_ptr) PNGARG((png_structp, png_size_t));
nuclear@26 1165 typedef void (*png_free_ptr) PNGARG((png_structp, png_voidp));
nuclear@26 1166
nuclear@26 1167 /* The structure that holds the information to read and write PNG files.
nuclear@26 1168 * The only people who need to care about what is inside of this are the
nuclear@26 1169 * people who will be modifying the library for their own special needs.
nuclear@26 1170 * It should NOT be accessed directly by an application, except to store
nuclear@26 1171 * the jmp_buf.
nuclear@26 1172 */
nuclear@26 1173
nuclear@26 1174 struct png_struct_def
nuclear@26 1175 {
nuclear@26 1176 #ifdef PNG_SETJMP_SUPPORTED
nuclear@26 1177 jmp_buf jmpbuf; /* used in png_error */
nuclear@26 1178 #endif
nuclear@26 1179 png_error_ptr error_fn; /* function for printing errors and aborting */
nuclear@26 1180 png_error_ptr warning_fn; /* function for printing warnings */
nuclear@26 1181 png_voidp error_ptr; /* user supplied struct for error functions */
nuclear@26 1182 png_rw_ptr write_data_fn; /* function for writing output data */
nuclear@26 1183 png_rw_ptr read_data_fn; /* function for reading input data */
nuclear@26 1184 png_voidp io_ptr; /* ptr to application struct for I/O functions */
nuclear@26 1185
nuclear@26 1186 #if defined(PNG_READ_USER_TRANSFORM_SUPPORTED)
nuclear@26 1187 png_user_transform_ptr read_user_transform_fn; /* user read transform */
nuclear@26 1188 #endif
nuclear@26 1189
nuclear@26 1190 #if defined(PNG_WRITE_USER_TRANSFORM_SUPPORTED)
nuclear@26 1191 png_user_transform_ptr write_user_transform_fn; /* user write transform */
nuclear@26 1192 #endif
nuclear@26 1193
nuclear@26 1194 /* These were added in libpng-1.0.2 */
nuclear@26 1195 #if defined(PNG_USER_TRANSFORM_PTR_SUPPORTED)
nuclear@26 1196 #if defined(PNG_READ_USER_TRANSFORM_SUPPORTED) || \
nuclear@26 1197 defined(PNG_WRITE_USER_TRANSFORM_SUPPORTED)
nuclear@26 1198 png_voidp user_transform_ptr; /* user supplied struct for user transform */
nuclear@26 1199 png_byte user_transform_depth; /* bit depth of user transformed pixels */
nuclear@26 1200 png_byte user_transform_channels; /* channels in user transformed pixels */
nuclear@26 1201 #endif
nuclear@26 1202 #endif
nuclear@26 1203
nuclear@26 1204 png_uint_32 mode; /* tells us where we are in the PNG file */
nuclear@26 1205 png_uint_32 flags; /* flags indicating various things to libpng */
nuclear@26 1206 png_uint_32 transformations; /* which transformations to perform */
nuclear@26 1207
nuclear@26 1208 z_stream zstream; /* pointer to decompression structure (below) */
nuclear@26 1209 png_bytep zbuf; /* buffer for zlib */
nuclear@26 1210 png_size_t zbuf_size; /* size of zbuf */
nuclear@26 1211 int zlib_level; /* holds zlib compression level */
nuclear@26 1212 int zlib_method; /* holds zlib compression method */
nuclear@26 1213 int zlib_window_bits; /* holds zlib compression window bits */
nuclear@26 1214 int zlib_mem_level; /* holds zlib compression memory level */
nuclear@26 1215 int zlib_strategy; /* holds zlib compression strategy */
nuclear@26 1216
nuclear@26 1217 png_uint_32 width; /* width of image in pixels */
nuclear@26 1218 png_uint_32 height; /* height of image in pixels */
nuclear@26 1219 png_uint_32 num_rows; /* number of rows in current pass */
nuclear@26 1220 png_uint_32 usr_width; /* width of row at start of write */
nuclear@26 1221 png_uint_32 rowbytes; /* size of row in bytes */
nuclear@26 1222 png_uint_32 irowbytes; /* size of current interlaced row in bytes */
nuclear@26 1223 png_uint_32 iwidth; /* width of current interlaced row in pixels */
nuclear@26 1224 png_uint_32 row_number; /* current row in interlace pass */
nuclear@26 1225 png_bytep prev_row; /* buffer to save previous (unfiltered) row */
nuclear@26 1226 png_bytep row_buf; /* buffer to save current (unfiltered) row */
nuclear@26 1227 #ifndef PNG_NO_WRITE_FILTER
nuclear@26 1228 png_bytep sub_row; /* buffer to save "sub" row when filtering */
nuclear@26 1229 png_bytep up_row; /* buffer to save "up" row when filtering */
nuclear@26 1230 png_bytep avg_row; /* buffer to save "avg" row when filtering */
nuclear@26 1231 png_bytep paeth_row; /* buffer to save "Paeth" row when filtering */
nuclear@26 1232 #endif
nuclear@26 1233 png_row_info row_info; /* used for transformation routines */
nuclear@26 1234
nuclear@26 1235 png_uint_32 idat_size; /* current IDAT size for read */
nuclear@26 1236 png_uint_32 crc; /* current chunk CRC value */
nuclear@26 1237 png_colorp palette; /* palette from the input file */
nuclear@26 1238 png_uint_16 num_palette; /* number of color entries in palette */
nuclear@26 1239 png_uint_16 num_trans; /* number of transparency values */
nuclear@26 1240 png_byte chunk_name[5]; /* null-terminated name of current chunk */
nuclear@26 1241 png_byte compression; /* file compression type (always 0) */
nuclear@26 1242 png_byte filter; /* file filter type (always 0) */
nuclear@26 1243 png_byte interlaced; /* PNG_INTERLACE_NONE, PNG_INTERLACE_ADAM7 */
nuclear@26 1244 png_byte pass; /* current interlace pass (0 - 6) */
nuclear@26 1245 png_byte do_filter; /* row filter flags (see PNG_FILTER_ below ) */
nuclear@26 1246 png_byte color_type; /* color type of file */
nuclear@26 1247 png_byte bit_depth; /* bit depth of file */
nuclear@26 1248 png_byte usr_bit_depth; /* bit depth of users row */
nuclear@26 1249 png_byte pixel_depth; /* number of bits per pixel */
nuclear@26 1250 png_byte channels; /* number of channels in file */
nuclear@26 1251 png_byte usr_channels; /* channels at start of write */
nuclear@26 1252 png_byte sig_bytes; /* magic bytes read/written from start of file */
nuclear@26 1253
nuclear@26 1254 #if defined(PNG_READ_FILLER_SUPPORTED) || defined(PNG_WRITE_FILLER_SUPPORTED)
nuclear@26 1255 #ifdef PNG_LEGACY_SUPPORTED
nuclear@26 1256 png_byte filler; /* filler byte for pixel expansion */
nuclear@26 1257 #else
nuclear@26 1258 png_uint_16 filler; /* filler bytes for pixel expansion */
nuclear@26 1259 #endif
nuclear@26 1260 #endif
nuclear@26 1261
nuclear@26 1262 #if defined(PNG_bKGD_SUPPORTED)
nuclear@26 1263 png_byte background_gamma_type;
nuclear@26 1264 # ifdef PNG_FLOATING_POINT_SUPPORTED
nuclear@26 1265 float background_gamma;
nuclear@26 1266 # endif
nuclear@26 1267 png_color_16 background; /* background color in screen gamma space */
nuclear@26 1268 #if defined(PNG_READ_GAMMA_SUPPORTED)
nuclear@26 1269 png_color_16 background_1; /* background normalized to gamma 1.0 */
nuclear@26 1270 #endif
nuclear@26 1271 #endif /* PNG_bKGD_SUPPORTED */
nuclear@26 1272
nuclear@26 1273 #if defined(PNG_WRITE_FLUSH_SUPPORTED)
nuclear@26 1274 png_flush_ptr output_flush_fn;/* Function for flushing output */
nuclear@26 1275 png_uint_32 flush_dist; /* how many rows apart to flush, 0 - no flush */
nuclear@26 1276 png_uint_32 flush_rows; /* number of rows written since last flush */
nuclear@26 1277 #endif
nuclear@26 1278
nuclear@26 1279 #if defined(PNG_READ_GAMMA_SUPPORTED) || defined(PNG_READ_BACKGROUND_SUPPORTED)
nuclear@26 1280 int gamma_shift; /* number of "insignificant" bits 16-bit gamma */
nuclear@26 1281 #ifdef PNG_FLOATING_POINT_SUPPORTED
nuclear@26 1282 float gamma; /* file gamma value */
nuclear@26 1283 float screen_gamma; /* screen gamma value (display_exponent) */
nuclear@26 1284 #endif
nuclear@26 1285 #endif
nuclear@26 1286
nuclear@26 1287 #if defined(PNG_READ_GAMMA_SUPPORTED) || defined(PNG_READ_BACKGROUND_SUPPORTED)
nuclear@26 1288 png_bytep gamma_table; /* gamma table for 8-bit depth files */
nuclear@26 1289 png_bytep gamma_from_1; /* converts from 1.0 to screen */
nuclear@26 1290 png_bytep gamma_to_1; /* converts from file to 1.0 */
nuclear@26 1291 png_uint_16pp gamma_16_table; /* gamma table for 16-bit depth files */
nuclear@26 1292 png_uint_16pp gamma_16_from_1; /* converts from 1.0 to screen */
nuclear@26 1293 png_uint_16pp gamma_16_to_1; /* converts from file to 1.0 */
nuclear@26 1294 #endif
nuclear@26 1295
nuclear@26 1296 #if defined(PNG_READ_GAMMA_SUPPORTED) || defined(PNG_sBIT_SUPPORTED)
nuclear@26 1297 png_color_8 sig_bit; /* significant bits in each available channel */
nuclear@26 1298 #endif
nuclear@26 1299
nuclear@26 1300 #if defined(PNG_READ_SHIFT_SUPPORTED) || defined(PNG_WRITE_SHIFT_SUPPORTED)
nuclear@26 1301 png_color_8 shift; /* shift for significant bit tranformation */
nuclear@26 1302 #endif
nuclear@26 1303
nuclear@26 1304 #if defined(PNG_tRNS_SUPPORTED) || defined(PNG_READ_BACKGROUND_SUPPORTED) \
nuclear@26 1305 || defined(PNG_READ_EXPAND_SUPPORTED) || defined(PNG_READ_BACKGROUND_SUPPORTED)
nuclear@26 1306 png_bytep trans; /* transparency values for paletted files */
nuclear@26 1307 png_color_16 trans_values; /* transparency values for non-paletted files */
nuclear@26 1308 #endif
nuclear@26 1309
nuclear@26 1310 png_read_status_ptr read_row_fn; /* called after each row is decoded */
nuclear@26 1311 png_write_status_ptr write_row_fn; /* called after each row is encoded */
nuclear@26 1312 #ifdef PNG_PROGRESSIVE_READ_SUPPORTED
nuclear@26 1313 png_progressive_info_ptr info_fn; /* called after header data fully read */
nuclear@26 1314 png_progressive_row_ptr row_fn; /* called after each prog. row is decoded */
nuclear@26 1315 png_progressive_end_ptr end_fn; /* called after image is complete */
nuclear@26 1316 png_bytep save_buffer_ptr; /* current location in save_buffer */
nuclear@26 1317 png_bytep save_buffer; /* buffer for previously read data */
nuclear@26 1318 png_bytep current_buffer_ptr; /* current location in current_buffer */
nuclear@26 1319 png_bytep current_buffer; /* buffer for recently used data */
nuclear@26 1320 png_uint_32 push_length; /* size of current input chunk */
nuclear@26 1321 png_uint_32 skip_length; /* bytes to skip in input data */
nuclear@26 1322 png_size_t save_buffer_size; /* amount of data now in save_buffer */
nuclear@26 1323 png_size_t save_buffer_max; /* total size of save_buffer */
nuclear@26 1324 png_size_t buffer_size; /* total amount of available input data */
nuclear@26 1325 png_size_t current_buffer_size; /* amount of data now in current_buffer */
nuclear@26 1326 int process_mode; /* what push library is currently doing */
nuclear@26 1327 int cur_palette; /* current push library palette index */
nuclear@26 1328
nuclear@26 1329 # if defined(PNG_TEXT_SUPPORTED)
nuclear@26 1330 png_size_t current_text_size; /* current size of text input data */
nuclear@26 1331 png_size_t current_text_left; /* how much text left to read in input */
nuclear@26 1332 png_charp current_text; /* current text chunk buffer */
nuclear@26 1333 png_charp current_text_ptr; /* current location in current_text */
nuclear@26 1334 # endif /* PNG_TEXT_SUPPORTED */
nuclear@26 1335 #endif /* PNG_PROGRESSIVE_READ_SUPPORTED */
nuclear@26 1336
nuclear@26 1337 #if defined(__TURBOC__) && !defined(_Windows) && !defined(__FLAT__)
nuclear@26 1338 /* for the Borland special 64K segment handler */
nuclear@26 1339 png_bytepp offset_table_ptr;
nuclear@26 1340 png_bytep offset_table;
nuclear@26 1341 png_uint_16 offset_table_number;
nuclear@26 1342 png_uint_16 offset_table_count;
nuclear@26 1343 png_uint_16 offset_table_count_free;
nuclear@26 1344 #endif
nuclear@26 1345
nuclear@26 1346 #if defined(PNG_READ_DITHER_SUPPORTED)
nuclear@26 1347 png_bytep palette_lookup; /* lookup table for dithering */
nuclear@26 1348 png_bytep dither_index; /* index translation for palette files */
nuclear@26 1349 #endif
nuclear@26 1350
nuclear@26 1351 #if defined(PNG_READ_DITHER_SUPPORTED) || defined(PNG_hIST_SUPPORTED)
nuclear@26 1352 png_uint_16p hist; /* histogram */
nuclear@26 1353 #endif
nuclear@26 1354
nuclear@26 1355 #if defined(PNG_WRITE_WEIGHTED_FILTER_SUPPORTED)
nuclear@26 1356 png_byte heuristic_method; /* heuristic for row filter selection */
nuclear@26 1357 png_byte num_prev_filters; /* number of weights for previous rows */
nuclear@26 1358 png_bytep prev_filters; /* filter type(s) of previous row(s) */
nuclear@26 1359 png_uint_16p filter_weights; /* weight(s) for previous line(s) */
nuclear@26 1360 png_uint_16p inv_filter_weights; /* 1/weight(s) for previous line(s) */
nuclear@26 1361 png_uint_16p filter_costs; /* relative filter calculation cost */
nuclear@26 1362 png_uint_16p inv_filter_costs; /* 1/relative filter calculation cost */
nuclear@26 1363 #endif
nuclear@26 1364
nuclear@26 1365 #if defined(PNG_TIME_RFC1123_SUPPORTED)
nuclear@26 1366 png_charp time_buffer; /* String to hold RFC 1123 time text */
nuclear@26 1367 #endif
nuclear@26 1368
nuclear@26 1369 /* New members added in libpng-1.0.6 */
nuclear@26 1370
nuclear@26 1371 #ifdef PNG_FREE_ME_SUPPORTED
nuclear@26 1372 png_uint_32 free_me; /* flags items libpng is responsible for freeing */
nuclear@26 1373 #endif
nuclear@26 1374
nuclear@26 1375 #if defined(PNG_USER_CHUNKS_SUPPORTED)
nuclear@26 1376 png_voidp user_chunk_ptr;
nuclear@26 1377 png_user_chunk_ptr read_user_chunk_fn; /* user read chunk handler */
nuclear@26 1378 #endif
nuclear@26 1379
nuclear@26 1380 #if defined(PNG_UNKNOWN_CHUNKS_SUPPORTED)
nuclear@26 1381 int num_chunk_list;
nuclear@26 1382 png_bytep chunk_list;
nuclear@26 1383 #endif
nuclear@26 1384
nuclear@26 1385 /* New members added in libpng-1.0.3 */
nuclear@26 1386 #if defined(PNG_READ_RGB_TO_GRAY_SUPPORTED)
nuclear@26 1387 png_byte rgb_to_gray_status;
nuclear@26 1388 /* These were changed from png_byte in libpng-1.0.6 */
nuclear@26 1389 png_uint_16 rgb_to_gray_red_coeff;
nuclear@26 1390 png_uint_16 rgb_to_gray_green_coeff;
nuclear@26 1391 png_uint_16 rgb_to_gray_blue_coeff;
nuclear@26 1392 #endif
nuclear@26 1393
nuclear@26 1394 /* New member added in libpng-1.0.4 (renamed in 1.0.9) */
nuclear@26 1395 #if defined(PNG_MNG_FEATURES_SUPPORTED) || \
nuclear@26 1396 defined(PNG_READ_EMPTY_PLTE_SUPPORTED) || \
nuclear@26 1397 defined(PNG_WRITE_EMPTY_PLTE_SUPPORTED)
nuclear@26 1398 /* changed from png_byte to png_uint_32 at version 1.2.0 */
nuclear@26 1399 #ifdef PNG_1_0_X
nuclear@26 1400 png_byte mng_features_permitted;
nuclear@26 1401 #else
nuclear@26 1402 png_uint_32 mng_features_permitted;
nuclear@26 1403 #endif /* PNG_1_0_X */
nuclear@26 1404 #endif
nuclear@26 1405
nuclear@26 1406 /* New member added in libpng-1.0.7 */
nuclear@26 1407 #if defined(PNG_READ_GAMMA_SUPPORTED) || defined(PNG_READ_BACKGROUND_SUPPORTED)
nuclear@26 1408 png_fixed_point int_gamma;
nuclear@26 1409 #endif
nuclear@26 1410
nuclear@26 1411 /* New member added in libpng-1.0.9, ifdef'ed out in 1.0.12, enabled in 1.2.0 */
nuclear@26 1412 #if defined(PNG_MNG_FEATURES_SUPPORTED)
nuclear@26 1413 png_byte filter_type;
nuclear@26 1414 #endif
nuclear@26 1415
nuclear@26 1416 #if defined(PNG_1_0_X)
nuclear@26 1417 /* New member added in libpng-1.0.10, ifdef'ed out in 1.2.0 */
nuclear@26 1418 png_uint_32 row_buf_size;
nuclear@26 1419 #endif
nuclear@26 1420
nuclear@26 1421 /* New members added in libpng-1.2.0 */
nuclear@26 1422 #if defined(PNG_ASSEMBLER_CODE_SUPPORTED)
nuclear@26 1423 # if !defined(PNG_1_0_X)
nuclear@26 1424 # if defined(PNG_MMX_CODE_SUPPORTED)
nuclear@26 1425 png_byte mmx_bitdepth_threshold;
nuclear@26 1426 png_uint_32 mmx_rowbytes_threshold;
nuclear@26 1427 # endif
nuclear@26 1428 png_uint_32 asm_flags;
nuclear@26 1429 # endif
nuclear@26 1430 #endif
nuclear@26 1431
nuclear@26 1432 /* New members added in libpng-1.0.2 but first enabled by default in 1.2.0 */
nuclear@26 1433 #ifdef PNG_USER_MEM_SUPPORTED
nuclear@26 1434 png_voidp mem_ptr; /* user supplied struct for mem functions */
nuclear@26 1435 png_malloc_ptr malloc_fn; /* function for allocating memory */
nuclear@26 1436 png_free_ptr free_fn; /* function for freeing memory */
nuclear@26 1437 #endif
nuclear@26 1438
nuclear@26 1439 /* New member added in libpng-1.0.13 and 1.2.0 */
nuclear@26 1440 png_bytep big_row_buf; /* buffer to save current (unfiltered) row */
nuclear@26 1441
nuclear@26 1442 #if defined(PNG_READ_DITHER_SUPPORTED)
nuclear@26 1443 /* The following three members were added at version 1.0.14 and 1.2.4 */
nuclear@26 1444 png_bytep dither_sort; /* working sort array */
nuclear@26 1445 png_bytep index_to_palette; /* where the original index currently is */
nuclear@26 1446 /* in the palette */
nuclear@26 1447 png_bytep palette_to_index; /* which original index points to this */
nuclear@26 1448 /* palette color */
nuclear@26 1449 #endif
nuclear@26 1450
nuclear@26 1451 /* New members added in libpng-1.0.16 and 1.2.6 */
nuclear@26 1452 png_byte compression_type;
nuclear@26 1453
nuclear@26 1454 #ifdef PNG_SET_USER_LIMITS_SUPPORTED
nuclear@26 1455 png_uint_32 user_width_max;
nuclear@26 1456 png_uint_32 user_height_max;
nuclear@26 1457 #endif
nuclear@26 1458
nuclear@26 1459 /* New member added in libpng-1.0.25 and 1.2.17 */
nuclear@26 1460 #if defined(PNG_UNKNOWN_CHUNKS_SUPPORTED)
nuclear@26 1461 /* storage for unknown chunk that the library doesn't recognize. */
nuclear@26 1462 png_unknown_chunk unknown_chunk;
nuclear@26 1463 #endif
nuclear@26 1464
nuclear@26 1465 /* New members added in libpng-1.2.26 */
nuclear@26 1466 png_uint_32 old_big_row_buf_size, old_prev_row_size;
nuclear@26 1467
nuclear@26 1468 /* New member added in libpng-1.2.30 */
nuclear@26 1469 png_charp chunkdata; /* buffer for reading chunk data */
nuclear@26 1470
nuclear@26 1471 };
nuclear@26 1472
nuclear@26 1473
nuclear@26 1474 /* This triggers a compiler error in png.c, if png.c and png.h
nuclear@26 1475 * do not agree upon the version number.
nuclear@26 1476 */
nuclear@26 1477 typedef png_structp version_1_2_33;
nuclear@26 1478
nuclear@26 1479 typedef png_struct FAR * FAR * png_structpp;
nuclear@26 1480
nuclear@26 1481 /* Here are the function definitions most commonly used. This is not
nuclear@26 1482 * the place to find out how to use libpng. See libpng.txt for the
nuclear@26 1483 * full explanation, see example.c for the summary. This just provides
nuclear@26 1484 * a simple one line description of the use of each function.
nuclear@26 1485 */
nuclear@26 1486
nuclear@26 1487 /* Returns the version number of the library */
nuclear@26 1488 extern PNG_EXPORT(png_uint_32,png_access_version_number) PNGARG((void));
nuclear@26 1489
nuclear@26 1490 /* Tell lib we have already handled the first <num_bytes> magic bytes.
nuclear@26 1491 * Handling more than 8 bytes from the beginning of the file is an error.
nuclear@26 1492 */
nuclear@26 1493 extern PNG_EXPORT(void,png_set_sig_bytes) PNGARG((png_structp png_ptr,
nuclear@26 1494 int num_bytes));
nuclear@26 1495
nuclear@26 1496 /* Check sig[start] through sig[start + num_to_check - 1] to see if it's a
nuclear@26 1497 * PNG file. Returns zero if the supplied bytes match the 8-byte PNG
nuclear@26 1498 * signature, and non-zero otherwise. Having num_to_check == 0 or
nuclear@26 1499 * start > 7 will always fail (ie return non-zero).
nuclear@26 1500 */
nuclear@26 1501 extern PNG_EXPORT(int,png_sig_cmp) PNGARG((png_bytep sig, png_size_t start,
nuclear@26 1502 png_size_t num_to_check));
nuclear@26 1503
nuclear@26 1504 /* Simple signature checking function. This is the same as calling
nuclear@26 1505 * png_check_sig(sig, n) := !png_sig_cmp(sig, 0, n).
nuclear@26 1506 */
nuclear@26 1507 extern PNG_EXPORT(int,png_check_sig) PNGARG((png_bytep sig, int num));
nuclear@26 1508
nuclear@26 1509 /* Allocate and initialize png_ptr struct for reading, and any other memory. */
nuclear@26 1510 extern PNG_EXPORT(png_structp,png_create_read_struct)
nuclear@26 1511 PNGARG((png_const_charp user_png_ver, png_voidp error_ptr,
nuclear@26 1512 png_error_ptr error_fn, png_error_ptr warn_fn));
nuclear@26 1513
nuclear@26 1514 /* Allocate and initialize png_ptr struct for writing, and any other memory */
nuclear@26 1515 extern PNG_EXPORT(png_structp,png_create_write_struct)
nuclear@26 1516 PNGARG((png_const_charp user_png_ver, png_voidp error_ptr,
nuclear@26 1517 png_error_ptr error_fn, png_error_ptr warn_fn));
nuclear@26 1518
nuclear@26 1519 #ifdef PNG_WRITE_SUPPORTED
nuclear@26 1520 extern PNG_EXPORT(png_uint_32,png_get_compression_buffer_size)
nuclear@26 1521 PNGARG((png_structp png_ptr));
nuclear@26 1522 #endif
nuclear@26 1523
nuclear@26 1524 #ifdef PNG_WRITE_SUPPORTED
nuclear@26 1525 extern PNG_EXPORT(void,png_set_compression_buffer_size)
nuclear@26 1526 PNGARG((png_structp png_ptr, png_uint_32 size));
nuclear@26 1527 #endif
nuclear@26 1528
nuclear@26 1529 /* Reset the compression stream */
nuclear@26 1530 extern PNG_EXPORT(int,png_reset_zstream) PNGARG((png_structp png_ptr));
nuclear@26 1531
nuclear@26 1532 /* New functions added in libpng-1.0.2 (not enabled by default until 1.2.0) */
nuclear@26 1533 #ifdef PNG_USER_MEM_SUPPORTED
nuclear@26 1534 extern PNG_EXPORT(png_structp,png_create_read_struct_2)
nuclear@26 1535 PNGARG((png_const_charp user_png_ver, png_voidp error_ptr,
nuclear@26 1536 png_error_ptr error_fn, png_error_ptr warn_fn, png_voidp mem_ptr,
nuclear@26 1537 png_malloc_ptr malloc_fn, png_free_ptr free_fn));
nuclear@26 1538 extern PNG_EXPORT(png_structp,png_create_write_struct_2)
nuclear@26 1539 PNGARG((png_const_charp user_png_ver, png_voidp error_ptr,
nuclear@26 1540 png_error_ptr error_fn, png_error_ptr warn_fn, png_voidp mem_ptr,
nuclear@26 1541 png_malloc_ptr malloc_fn, png_free_ptr free_fn));
nuclear@26 1542 #endif
nuclear@26 1543
nuclear@26 1544 /* Write a PNG chunk - size, type, (optional) data, CRC. */
nuclear@26 1545 extern PNG_EXPORT(void,png_write_chunk) PNGARG((png_structp png_ptr,
nuclear@26 1546 png_bytep chunk_name, png_bytep data, png_size_t length));
nuclear@26 1547
nuclear@26 1548 /* Write the start of a PNG chunk - length and chunk name. */
nuclear@26 1549 extern PNG_EXPORT(void,png_write_chunk_start) PNGARG((png_structp png_ptr,
nuclear@26 1550 png_bytep chunk_name, png_uint_32 length));
nuclear@26 1551
nuclear@26 1552 /* Write the data of a PNG chunk started with png_write_chunk_start(). */
nuclear@26 1553 extern PNG_EXPORT(void,png_write_chunk_data) PNGARG((png_structp png_ptr,
nuclear@26 1554 png_bytep data, png_size_t length));
nuclear@26 1555
nuclear@26 1556 /* Finish a chunk started with png_write_chunk_start() (includes CRC). */
nuclear@26 1557 extern PNG_EXPORT(void,png_write_chunk_end) PNGARG((png_structp png_ptr));
nuclear@26 1558
nuclear@26 1559 /* Allocate and initialize the info structure */
nuclear@26 1560 extern PNG_EXPORT(png_infop,png_create_info_struct)
nuclear@26 1561 PNGARG((png_structp png_ptr));
nuclear@26 1562
nuclear@26 1563 #if defined(PNG_1_0_X) || defined (PNG_1_2_X)
nuclear@26 1564 /* Initialize the info structure (old interface - DEPRECATED) */
nuclear@26 1565 extern PNG_EXPORT(void,png_info_init) PNGARG((png_infop info_ptr));
nuclear@26 1566 #undef png_info_init
nuclear@26 1567 #define png_info_init(info_ptr) png_info_init_3(&info_ptr,\
nuclear@26 1568 png_sizeof(png_info));
nuclear@26 1569 #endif
nuclear@26 1570
nuclear@26 1571 extern PNG_EXPORT(void,png_info_init_3) PNGARG((png_infopp info_ptr,
nuclear@26 1572 png_size_t png_info_struct_size));
nuclear@26 1573
nuclear@26 1574 /* Writes all the PNG information before the image. */
nuclear@26 1575 extern PNG_EXPORT(void,png_write_info_before_PLTE) PNGARG((png_structp png_ptr,
nuclear@26 1576 png_infop info_ptr));
nuclear@26 1577 extern PNG_EXPORT(void,png_write_info) PNGARG((png_structp png_ptr,
nuclear@26 1578 png_infop info_ptr));
nuclear@26 1579
nuclear@26 1580 #ifndef PNG_NO_SEQUENTIAL_READ_SUPPORTED
nuclear@26 1581 /* read the information before the actual image data. */
nuclear@26 1582 extern PNG_EXPORT(void,png_read_info) PNGARG((png_structp png_ptr,
nuclear@26 1583 png_infop info_ptr));
nuclear@26 1584 #endif
nuclear@26 1585
nuclear@26 1586 #if defined(PNG_TIME_RFC1123_SUPPORTED)
nuclear@26 1587 extern PNG_EXPORT(png_charp,png_convert_to_rfc1123)
nuclear@26 1588 PNGARG((png_structp png_ptr, png_timep ptime));
nuclear@26 1589 #endif
nuclear@26 1590
nuclear@26 1591 #if !defined(_WIN32_WCE)
nuclear@26 1592 /* "time.h" functions are not supported on WindowsCE */
nuclear@26 1593 #if defined(PNG_WRITE_tIME_SUPPORTED)
nuclear@26 1594 /* convert from a struct tm to png_time */
nuclear@26 1595 extern PNG_EXPORT(void,png_convert_from_struct_tm) PNGARG((png_timep ptime,
nuclear@26 1596 struct tm FAR * ttime));
nuclear@26 1597
nuclear@26 1598 /* convert from time_t to png_time. Uses gmtime() */
nuclear@26 1599 extern PNG_EXPORT(void,png_convert_from_time_t) PNGARG((png_timep ptime,
nuclear@26 1600 time_t ttime));
nuclear@26 1601 #endif /* PNG_WRITE_tIME_SUPPORTED */
nuclear@26 1602 #endif /* _WIN32_WCE */
nuclear@26 1603
nuclear@26 1604 #if defined(PNG_READ_EXPAND_SUPPORTED)
nuclear@26 1605 /* Expand data to 24-bit RGB, or 8-bit grayscale, with alpha if available. */
nuclear@26 1606 extern PNG_EXPORT(void,png_set_expand) PNGARG((png_structp png_ptr));
nuclear@26 1607 #if !defined(PNG_1_0_X)
nuclear@26 1608 extern PNG_EXPORT(void,png_set_expand_gray_1_2_4_to_8) PNGARG((png_structp
nuclear@26 1609 png_ptr));
nuclear@26 1610 #endif
nuclear@26 1611 extern PNG_EXPORT(void,png_set_palette_to_rgb) PNGARG((png_structp png_ptr));
nuclear@26 1612 extern PNG_EXPORT(void,png_set_tRNS_to_alpha) PNGARG((png_structp png_ptr));
nuclear@26 1613 #if defined(PNG_1_0_X) || defined (PNG_1_2_X)
nuclear@26 1614 /* Deprecated */
nuclear@26 1615 extern PNG_EXPORT(void,png_set_gray_1_2_4_to_8) PNGARG((png_structp png_ptr));
nuclear@26 1616 #endif
nuclear@26 1617 #endif
nuclear@26 1618
nuclear@26 1619 #if defined(PNG_READ_BGR_SUPPORTED) || defined(PNG_WRITE_BGR_SUPPORTED)
nuclear@26 1620 /* Use blue, green, red order for pixels. */
nuclear@26 1621 extern PNG_EXPORT(void,png_set_bgr) PNGARG((png_structp png_ptr));
nuclear@26 1622 #endif
nuclear@26 1623
nuclear@26 1624 #if defined(PNG_READ_GRAY_TO_RGB_SUPPORTED)
nuclear@26 1625 /* Expand the grayscale to 24-bit RGB if necessary. */
nuclear@26 1626 extern PNG_EXPORT(void,png_set_gray_to_rgb) PNGARG((png_structp png_ptr));
nuclear@26 1627 #endif
nuclear@26 1628
nuclear@26 1629 #if defined(PNG_READ_RGB_TO_GRAY_SUPPORTED)
nuclear@26 1630 /* Reduce RGB to grayscale. */
nuclear@26 1631 #ifdef PNG_FLOATING_POINT_SUPPORTED
nuclear@26 1632 extern PNG_EXPORT(void,png_set_rgb_to_gray) PNGARG((png_structp png_ptr,
nuclear@26 1633 int error_action, double red, double green ));
nuclear@26 1634 #endif
nuclear@26 1635 extern PNG_EXPORT(void,png_set_rgb_to_gray_fixed) PNGARG((png_structp png_ptr,
nuclear@26 1636 int error_action, png_fixed_point red, png_fixed_point green ));
nuclear@26 1637 extern PNG_EXPORT(png_byte,png_get_rgb_to_gray_status) PNGARG((png_structp
nuclear@26 1638 png_ptr));
nuclear@26 1639 #endif
nuclear@26 1640
nuclear@26 1641 extern PNG_EXPORT(void,png_build_grayscale_palette) PNGARG((int bit_depth,
nuclear@26 1642 png_colorp palette));
nuclear@26 1643
nuclear@26 1644 #if defined(PNG_READ_STRIP_ALPHA_SUPPORTED)
nuclear@26 1645 extern PNG_EXPORT(void,png_set_strip_alpha) PNGARG((png_structp png_ptr));
nuclear@26 1646 #endif
nuclear@26 1647
nuclear@26 1648 #if defined(PNG_READ_SWAP_ALPHA_SUPPORTED) || \
nuclear@26 1649 defined(PNG_WRITE_SWAP_ALPHA_SUPPORTED)
nuclear@26 1650 extern PNG_EXPORT(void,png_set_swap_alpha) PNGARG((png_structp png_ptr));
nuclear@26 1651 #endif
nuclear@26 1652
nuclear@26 1653 #if defined(PNG_READ_INVERT_ALPHA_SUPPORTED) || \
nuclear@26 1654 defined(PNG_WRITE_INVERT_ALPHA_SUPPORTED)
nuclear@26 1655 extern PNG_EXPORT(void,png_set_invert_alpha) PNGARG((png_structp png_ptr));
nuclear@26 1656 #endif
nuclear@26 1657
nuclear@26 1658 #if defined(PNG_READ_FILLER_SUPPORTED) || defined(PNG_WRITE_FILLER_SUPPORTED)
nuclear@26 1659 /* Add a filler byte to 8-bit Gray or 24-bit RGB images. */
nuclear@26 1660 extern PNG_EXPORT(void,png_set_filler) PNGARG((png_structp png_ptr,
nuclear@26 1661 png_uint_32 filler, int flags));
nuclear@26 1662 /* The values of the PNG_FILLER_ defines should NOT be changed */
nuclear@26 1663 #define PNG_FILLER_BEFORE 0
nuclear@26 1664 #define PNG_FILLER_AFTER 1
nuclear@26 1665 /* Add an alpha byte to 8-bit Gray or 24-bit RGB images. */
nuclear@26 1666 #if !defined(PNG_1_0_X)
nuclear@26 1667 extern PNG_EXPORT(void,png_set_add_alpha) PNGARG((png_structp png_ptr,
nuclear@26 1668 png_uint_32 filler, int flags));
nuclear@26 1669 #endif
nuclear@26 1670 #endif /* PNG_READ_FILLER_SUPPORTED || PNG_WRITE_FILLER_SUPPORTED */
nuclear@26 1671
nuclear@26 1672 #if defined(PNG_READ_SWAP_SUPPORTED) || defined(PNG_WRITE_SWAP_SUPPORTED)
nuclear@26 1673 /* Swap bytes in 16-bit depth files. */
nuclear@26 1674 extern PNG_EXPORT(void,png_set_swap) PNGARG((png_structp png_ptr));
nuclear@26 1675 #endif
nuclear@26 1676
nuclear@26 1677 #if defined(PNG_READ_PACK_SUPPORTED) || defined(PNG_WRITE_PACK_SUPPORTED)
nuclear@26 1678 /* Use 1 byte per pixel in 1, 2, or 4-bit depth files. */
nuclear@26 1679 extern PNG_EXPORT(void,png_set_packing) PNGARG((png_structp png_ptr));
nuclear@26 1680 #endif
nuclear@26 1681
nuclear@26 1682 #if defined(PNG_READ_PACKSWAP_SUPPORTED) || defined(PNG_WRITE_PACKSWAP_SUPPORTED)
nuclear@26 1683 /* Swap packing order of pixels in bytes. */
nuclear@26 1684 extern PNG_EXPORT(void,png_set_packswap) PNGARG((png_structp png_ptr));
nuclear@26 1685 #endif
nuclear@26 1686
nuclear@26 1687 #if defined(PNG_READ_SHIFT_SUPPORTED) || defined(PNG_WRITE_SHIFT_SUPPORTED)
nuclear@26 1688 /* Converts files to legal bit depths. */
nuclear@26 1689 extern PNG_EXPORT(void,png_set_shift) PNGARG((png_structp png_ptr,
nuclear@26 1690 png_color_8p true_bits));
nuclear@26 1691 #endif
nuclear@26 1692
nuclear@26 1693 #if defined(PNG_READ_INTERLACING_SUPPORTED) || \
nuclear@26 1694 defined(PNG_WRITE_INTERLACING_SUPPORTED)
nuclear@26 1695 /* Have the code handle the interlacing. Returns the number of passes. */
nuclear@26 1696 extern PNG_EXPORT(int,png_set_interlace_handling) PNGARG((png_structp png_ptr));
nuclear@26 1697 #endif
nuclear@26 1698
nuclear@26 1699 #if defined(PNG_READ_INVERT_SUPPORTED) || defined(PNG_WRITE_INVERT_SUPPORTED)
nuclear@26 1700 /* Invert monochrome files */
nuclear@26 1701 extern PNG_EXPORT(void,png_set_invert_mono) PNGARG((png_structp png_ptr));
nuclear@26 1702 #endif
nuclear@26 1703
nuclear@26 1704 #if defined(PNG_READ_BACKGROUND_SUPPORTED)
nuclear@26 1705 /* Handle alpha and tRNS by replacing with a background color. */
nuclear@26 1706 #ifdef PNG_FLOATING_POINT_SUPPORTED
nuclear@26 1707 extern PNG_EXPORT(void,png_set_background) PNGARG((png_structp png_ptr,
nuclear@26 1708 png_color_16p background_color, int background_gamma_code,
nuclear@26 1709 int need_expand, double background_gamma));
nuclear@26 1710 #endif
nuclear@26 1711 #define PNG_BACKGROUND_GAMMA_UNKNOWN 0
nuclear@26 1712 #define PNG_BACKGROUND_GAMMA_SCREEN 1
nuclear@26 1713 #define PNG_BACKGROUND_GAMMA_FILE 2
nuclear@26 1714 #define PNG_BACKGROUND_GAMMA_UNIQUE 3
nuclear@26 1715 #endif
nuclear@26 1716
nuclear@26 1717 #if defined(PNG_READ_16_TO_8_SUPPORTED)
nuclear@26 1718 /* strip the second byte of information from a 16-bit depth file. */
nuclear@26 1719 extern PNG_EXPORT(void,png_set_strip_16) PNGARG((png_structp png_ptr));
nuclear@26 1720 #endif
nuclear@26 1721
nuclear@26 1722 #if defined(PNG_READ_DITHER_SUPPORTED)
nuclear@26 1723 /* Turn on dithering, and reduce the palette to the number of colors available. */
nuclear@26 1724 extern PNG_EXPORT(void,png_set_dither) PNGARG((png_structp png_ptr,
nuclear@26 1725 png_colorp palette, int num_palette, int maximum_colors,
nuclear@26 1726 png_uint_16p histogram, int full_dither));
nuclear@26 1727 #endif
nuclear@26 1728
nuclear@26 1729 #if defined(PNG_READ_GAMMA_SUPPORTED)
nuclear@26 1730 /* Handle gamma correction. Screen_gamma=(display_exponent) */
nuclear@26 1731 #ifdef PNG_FLOATING_POINT_SUPPORTED
nuclear@26 1732 extern PNG_EXPORT(void,png_set_gamma) PNGARG((png_structp png_ptr,
nuclear@26 1733 double screen_gamma, double default_file_gamma));
nuclear@26 1734 #endif
nuclear@26 1735 #endif
nuclear@26 1736
nuclear@26 1737 #if defined(PNG_1_0_X) || defined (PNG_1_2_X)
nuclear@26 1738 #if defined(PNG_READ_EMPTY_PLTE_SUPPORTED) || \
nuclear@26 1739 defined(PNG_WRITE_EMPTY_PLTE_SUPPORTED)
nuclear@26 1740 /* Permit or disallow empty PLTE (0: not permitted, 1: permitted) */
nuclear@26 1741 /* Deprecated and will be removed. Use png_permit_mng_features() instead. */
nuclear@26 1742 extern PNG_EXPORT(void,png_permit_empty_plte) PNGARG((png_structp png_ptr,
nuclear@26 1743 int empty_plte_permitted));
nuclear@26 1744 #endif
nuclear@26 1745 #endif
nuclear@26 1746
nuclear@26 1747 #if defined(PNG_WRITE_FLUSH_SUPPORTED)
nuclear@26 1748 /* Set how many lines between output flushes - 0 for no flushing */
nuclear@26 1749 extern PNG_EXPORT(void,png_set_flush) PNGARG((png_structp png_ptr, int nrows));
nuclear@26 1750 /* Flush the current PNG output buffer */
nuclear@26 1751 extern PNG_EXPORT(void,png_write_flush) PNGARG((png_structp png_ptr));
nuclear@26 1752 #endif
nuclear@26 1753
nuclear@26 1754 /* optional update palette with requested transformations */
nuclear@26 1755 extern PNG_EXPORT(void,png_start_read_image) PNGARG((png_structp png_ptr));
nuclear@26 1756
nuclear@26 1757 /* optional call to update the users info structure */
nuclear@26 1758 extern PNG_EXPORT(void,png_read_update_info) PNGARG((png_structp png_ptr,
nuclear@26 1759 png_infop info_ptr));
nuclear@26 1760
nuclear@26 1761 #ifndef PNG_NO_SEQUENTIAL_READ_SUPPORTED
nuclear@26 1762 /* read one or more rows of image data. */
nuclear@26 1763 extern PNG_EXPORT(void,png_read_rows) PNGARG((png_structp png_ptr,
nuclear@26 1764 png_bytepp row, png_bytepp display_row, png_uint_32 num_rows));
nuclear@26 1765 #endif
nuclear@26 1766
nuclear@26 1767 #ifndef PNG_NO_SEQUENTIAL_READ_SUPPORTED
nuclear@26 1768 /* read a row of data. */
nuclear@26 1769 extern PNG_EXPORT(void,png_read_row) PNGARG((png_structp png_ptr,
nuclear@26 1770 png_bytep row,
nuclear@26 1771 png_bytep display_row));
nuclear@26 1772 #endif
nuclear@26 1773
nuclear@26 1774 #ifndef PNG_NO_SEQUENTIAL_READ_SUPPORTED
nuclear@26 1775 /* read the whole image into memory at once. */
nuclear@26 1776 extern PNG_EXPORT(void,png_read_image) PNGARG((png_structp png_ptr,
nuclear@26 1777 png_bytepp image));
nuclear@26 1778 #endif
nuclear@26 1779
nuclear@26 1780 /* write a row of image data */
nuclear@26 1781 extern PNG_EXPORT(void,png_write_row) PNGARG((png_structp png_ptr,
nuclear@26 1782 png_bytep row));
nuclear@26 1783
nuclear@26 1784 /* write a few rows of image data */
nuclear@26 1785 extern PNG_EXPORT(void,png_write_rows) PNGARG((png_structp png_ptr,
nuclear@26 1786 png_bytepp row, png_uint_32 num_rows));
nuclear@26 1787
nuclear@26 1788 /* write the image data */
nuclear@26 1789 extern PNG_EXPORT(void,png_write_image) PNGARG((png_structp png_ptr,
nuclear@26 1790 png_bytepp image));
nuclear@26 1791
nuclear@26 1792 /* writes the end of the PNG file. */
nuclear@26 1793 extern PNG_EXPORT(void,png_write_end) PNGARG((png_structp png_ptr,
nuclear@26 1794 png_infop info_ptr));
nuclear@26 1795
nuclear@26 1796 #ifndef PNG_NO_SEQUENTIAL_READ_SUPPORTED
nuclear@26 1797 /* read the end of the PNG file. */
nuclear@26 1798 extern PNG_EXPORT(void,png_read_end) PNGARG((png_structp png_ptr,
nuclear@26 1799 png_infop info_ptr));
nuclear@26 1800 #endif
nuclear@26 1801
nuclear@26 1802 /* free any memory associated with the png_info_struct */
nuclear@26 1803 extern PNG_EXPORT(void,png_destroy_info_struct) PNGARG((png_structp png_ptr,
nuclear@26 1804 png_infopp info_ptr_ptr));
nuclear@26 1805
nuclear@26 1806 /* free any memory associated with the png_struct and the png_info_structs */
nuclear@26 1807 extern PNG_EXPORT(void,png_destroy_read_struct) PNGARG((png_structpp
nuclear@26 1808 png_ptr_ptr, png_infopp info_ptr_ptr, png_infopp end_info_ptr_ptr));
nuclear@26 1809
nuclear@26 1810 /* free all memory used by the read (old method - NOT DLL EXPORTED) */
nuclear@26 1811 extern void png_read_destroy PNGARG((png_structp png_ptr, png_infop info_ptr,
nuclear@26 1812 png_infop end_info_ptr));
nuclear@26 1813
nuclear@26 1814 /* free any memory associated with the png_struct and the png_info_structs */
nuclear@26 1815 extern PNG_EXPORT(void,png_destroy_write_struct)
nuclear@26 1816 PNGARG((png_structpp png_ptr_ptr, png_infopp info_ptr_ptr));
nuclear@26 1817
nuclear@26 1818 /* free any memory used in png_ptr struct (old method - NOT DLL EXPORTED) */
nuclear@26 1819 extern void png_write_destroy PNGARG((png_structp png_ptr));
nuclear@26 1820
nuclear@26 1821 /* set the libpng method of handling chunk CRC errors */
nuclear@26 1822 extern PNG_EXPORT(void,png_set_crc_action) PNGARG((png_structp png_ptr,
nuclear@26 1823 int crit_action, int ancil_action));
nuclear@26 1824
nuclear@26 1825 /* Values for png_set_crc_action() to say how to handle CRC errors in
nuclear@26 1826 * ancillary and critical chunks, and whether to use the data contained
nuclear@26 1827 * therein. Note that it is impossible to "discard" data in a critical
nuclear@26 1828 * chunk. For versions prior to 0.90, the action was always error/quit,
nuclear@26 1829 * whereas in version 0.90 and later, the action for CRC errors in ancillary
nuclear@26 1830 * chunks is warn/discard. These values should NOT be changed.
nuclear@26 1831 *
nuclear@26 1832 * value action:critical action:ancillary
nuclear@26 1833 */
nuclear@26 1834 #define PNG_CRC_DEFAULT 0 /* error/quit warn/discard data */
nuclear@26 1835 #define PNG_CRC_ERROR_QUIT 1 /* error/quit error/quit */
nuclear@26 1836 #define PNG_CRC_WARN_DISCARD 2 /* (INVALID) warn/discard data */
nuclear@26 1837 #define PNG_CRC_WARN_USE 3 /* warn/use data warn/use data */
nuclear@26 1838 #define PNG_CRC_QUIET_USE 4 /* quiet/use data quiet/use data */
nuclear@26 1839 #define PNG_CRC_NO_CHANGE 5 /* use current value use current value */
nuclear@26 1840
nuclear@26 1841 /* These functions give the user control over the scan-line filtering in
nuclear@26 1842 * libpng and the compression methods used by zlib. These functions are
nuclear@26 1843 * mainly useful for testing, as the defaults should work with most users.
nuclear@26 1844 * Those users who are tight on memory or want faster performance at the
nuclear@26 1845 * expense of compression can modify them. See the compression library
nuclear@26 1846 * header file (zlib.h) for an explination of the compression functions.
nuclear@26 1847 */
nuclear@26 1848
nuclear@26 1849 /* set the filtering method(s) used by libpng. Currently, the only valid
nuclear@26 1850 * value for "method" is 0.
nuclear@26 1851 */
nuclear@26 1852 extern PNG_EXPORT(void,png_set_filter) PNGARG((png_structp png_ptr, int method,
nuclear@26 1853 int filters));
nuclear@26 1854
nuclear@26 1855 /* Flags for png_set_filter() to say which filters to use. The flags
nuclear@26 1856 * are chosen so that they don't conflict with real filter types
nuclear@26 1857 * below, in case they are supplied instead of the #defined constants.
nuclear@26 1858 * These values should NOT be changed.
nuclear@26 1859 */
nuclear@26 1860 #define PNG_NO_FILTERS 0x00
nuclear@26 1861 #define PNG_FILTER_NONE 0x08
nuclear@26 1862 #define PNG_FILTER_SUB 0x10
nuclear@26 1863 #define PNG_FILTER_UP 0x20
nuclear@26 1864 #define PNG_FILTER_AVG 0x40
nuclear@26 1865 #define PNG_FILTER_PAETH 0x80
nuclear@26 1866 #define PNG_ALL_FILTERS (PNG_FILTER_NONE | PNG_FILTER_SUB | PNG_FILTER_UP | \
nuclear@26 1867 PNG_FILTER_AVG | PNG_FILTER_PAETH)
nuclear@26 1868
nuclear@26 1869 /* Filter values (not flags) - used in pngwrite.c, pngwutil.c for now.
nuclear@26 1870 * These defines should NOT be changed.
nuclear@26 1871 */
nuclear@26 1872 #define PNG_FILTER_VALUE_NONE 0
nuclear@26 1873 #define PNG_FILTER_VALUE_SUB 1
nuclear@26 1874 #define PNG_FILTER_VALUE_UP 2
nuclear@26 1875 #define PNG_FILTER_VALUE_AVG 3
nuclear@26 1876 #define PNG_FILTER_VALUE_PAETH 4
nuclear@26 1877 #define PNG_FILTER_VALUE_LAST 5
nuclear@26 1878
nuclear@26 1879 #if defined(PNG_WRITE_WEIGHTED_FILTER_SUPPORTED) /* EXPERIMENTAL */
nuclear@26 1880 /* The "heuristic_method" is given by one of the PNG_FILTER_HEURISTIC_
nuclear@26 1881 * defines, either the default (minimum-sum-of-absolute-differences), or
nuclear@26 1882 * the experimental method (weighted-minimum-sum-of-absolute-differences).
nuclear@26 1883 *
nuclear@26 1884 * Weights are factors >= 1.0, indicating how important it is to keep the
nuclear@26 1885 * filter type consistent between rows. Larger numbers mean the current
nuclear@26 1886 * filter is that many times as likely to be the same as the "num_weights"
nuclear@26 1887 * previous filters. This is cumulative for each previous row with a weight.
nuclear@26 1888 * There needs to be "num_weights" values in "filter_weights", or it can be
nuclear@26 1889 * NULL if the weights aren't being specified. Weights have no influence on
nuclear@26 1890 * the selection of the first row filter. Well chosen weights can (in theory)
nuclear@26 1891 * improve the compression for a given image.
nuclear@26 1892 *
nuclear@26 1893 * Costs are factors >= 1.0 indicating the relative decoding costs of a
nuclear@26 1894 * filter type. Higher costs indicate more decoding expense, and are
nuclear@26 1895 * therefore less likely to be selected over a filter with lower computational
nuclear@26 1896 * costs. There needs to be a value in "filter_costs" for each valid filter
nuclear@26 1897 * type (given by PNG_FILTER_VALUE_LAST), or it can be NULL if you aren't
nuclear@26 1898 * setting the costs. Costs try to improve the speed of decompression without
nuclear@26 1899 * unduly increasing the compressed image size.
nuclear@26 1900 *
nuclear@26 1901 * A negative weight or cost indicates the default value is to be used, and
nuclear@26 1902 * values in the range [0.0, 1.0) indicate the value is to remain unchanged.
nuclear@26 1903 * The default values for both weights and costs are currently 1.0, but may
nuclear@26 1904 * change if good general weighting/cost heuristics can be found. If both
nuclear@26 1905 * the weights and costs are set to 1.0, this degenerates the WEIGHTED method
nuclear@26 1906 * to the UNWEIGHTED method, but with added encoding time/computation.
nuclear@26 1907 */
nuclear@26 1908 #ifdef PNG_FLOATING_POINT_SUPPORTED
nuclear@26 1909 extern PNG_EXPORT(void,png_set_filter_heuristics) PNGARG((png_structp png_ptr,
nuclear@26 1910 int heuristic_method, int num_weights, png_doublep filter_weights,
nuclear@26 1911 png_doublep filter_costs));
nuclear@26 1912 #endif
nuclear@26 1913 #endif /* PNG_WRITE_WEIGHTED_FILTER_SUPPORTED */
nuclear@26 1914
nuclear@26 1915 /* Heuristic used for row filter selection. These defines should NOT be
nuclear@26 1916 * changed.
nuclear@26 1917 */
nuclear@26 1918 #define PNG_FILTER_HEURISTIC_DEFAULT 0 /* Currently "UNWEIGHTED" */
nuclear@26 1919 #define PNG_FILTER_HEURISTIC_UNWEIGHTED 1 /* Used by libpng < 0.95 */
nuclear@26 1920 #define PNG_FILTER_HEURISTIC_WEIGHTED 2 /* Experimental feature */
nuclear@26 1921 #define PNG_FILTER_HEURISTIC_LAST 3 /* Not a valid value */
nuclear@26 1922
nuclear@26 1923 /* Set the library compression level. Currently, valid values range from
nuclear@26 1924 * 0 - 9, corresponding directly to the zlib compression levels 0 - 9
nuclear@26 1925 * (0 - no compression, 9 - "maximal" compression). Note that tests have
nuclear@26 1926 * shown that zlib compression levels 3-6 usually perform as well as level 9
nuclear@26 1927 * for PNG images, and do considerably fewer caclulations. In the future,
nuclear@26 1928 * these values may not correspond directly to the zlib compression levels.
nuclear@26 1929 */
nuclear@26 1930 extern PNG_EXPORT(void,png_set_compression_level) PNGARG((png_structp png_ptr,
nuclear@26 1931 int level));
nuclear@26 1932
nuclear@26 1933 extern PNG_EXPORT(void,png_set_compression_mem_level)
nuclear@26 1934 PNGARG((png_structp png_ptr, int mem_level));
nuclear@26 1935
nuclear@26 1936 extern PNG_EXPORT(void,png_set_compression_strategy)
nuclear@26 1937 PNGARG((png_structp png_ptr, int strategy));
nuclear@26 1938
nuclear@26 1939 extern PNG_EXPORT(void,png_set_compression_window_bits)
nuclear@26 1940 PNGARG((png_structp png_ptr, int window_bits));
nuclear@26 1941
nuclear@26 1942 extern PNG_EXPORT(void,png_set_compression_method) PNGARG((png_structp png_ptr,
nuclear@26 1943 int method));
nuclear@26 1944
nuclear@26 1945 /* These next functions are called for input/output, memory, and error
nuclear@26 1946 * handling. They are in the file pngrio.c, pngwio.c, and pngerror.c,
nuclear@26 1947 * and call standard C I/O routines such as fread(), fwrite(), and
nuclear@26 1948 * fprintf(). These functions can be made to use other I/O routines
nuclear@26 1949 * at run time for those applications that need to handle I/O in a
nuclear@26 1950 * different manner by calling png_set_???_fn(). See libpng.txt for
nuclear@26 1951 * more information.
nuclear@26 1952 */
nuclear@26 1953
nuclear@26 1954 #if !defined(PNG_NO_STDIO)
nuclear@26 1955 /* Initialize the input/output for the PNG file to the default functions. */
nuclear@26 1956 extern PNG_EXPORT(void,png_init_io) PNGARG((png_structp png_ptr, png_FILE_p fp));
nuclear@26 1957 #endif
nuclear@26 1958
nuclear@26 1959 /* Replace the (error and abort), and warning functions with user
nuclear@26 1960 * supplied functions. If no messages are to be printed you must still
nuclear@26 1961 * write and use replacement functions. The replacement error_fn should
nuclear@26 1962 * still do a longjmp to the last setjmp location if you are using this
nuclear@26 1963 * method of error handling. If error_fn or warning_fn is NULL, the
nuclear@26 1964 * default function will be used.
nuclear@26 1965 */
nuclear@26 1966
nuclear@26 1967 extern PNG_EXPORT(void,png_set_error_fn) PNGARG((png_structp png_ptr,
nuclear@26 1968 png_voidp error_ptr, png_error_ptr error_fn, png_error_ptr warning_fn));
nuclear@26 1969
nuclear@26 1970 /* Return the user pointer associated with the error functions */
nuclear@26 1971 extern PNG_EXPORT(png_voidp,png_get_error_ptr) PNGARG((png_structp png_ptr));
nuclear@26 1972
nuclear@26 1973 /* Replace the default data output functions with a user supplied one(s).
nuclear@26 1974 * If buffered output is not used, then output_flush_fn can be set to NULL.
nuclear@26 1975 * If PNG_WRITE_FLUSH_SUPPORTED is not defined at libpng compile time
nuclear@26 1976 * output_flush_fn will be ignored (and thus can be NULL).
nuclear@26 1977 */
nuclear@26 1978 extern PNG_EXPORT(void,png_set_write_fn) PNGARG((png_structp png_ptr,
nuclear@26 1979 png_voidp io_ptr, png_rw_ptr write_data_fn, png_flush_ptr output_flush_fn));
nuclear@26 1980
nuclear@26 1981 /* Replace the default data input function with a user supplied one. */
nuclear@26 1982 extern PNG_EXPORT(void,png_set_read_fn) PNGARG((png_structp png_ptr,
nuclear@26 1983 png_voidp io_ptr, png_rw_ptr read_data_fn));
nuclear@26 1984
nuclear@26 1985 /* Return the user pointer associated with the I/O functions */
nuclear@26 1986 extern PNG_EXPORT(png_voidp,png_get_io_ptr) PNGARG((png_structp png_ptr));
nuclear@26 1987
nuclear@26 1988 extern PNG_EXPORT(void,png_set_read_status_fn) PNGARG((png_structp png_ptr,
nuclear@26 1989 png_read_status_ptr read_row_fn));
nuclear@26 1990
nuclear@26 1991 extern PNG_EXPORT(void,png_set_write_status_fn) PNGARG((png_structp png_ptr,
nuclear@26 1992 png_write_status_ptr write_row_fn));
nuclear@26 1993
nuclear@26 1994 #ifdef PNG_USER_MEM_SUPPORTED
nuclear@26 1995 /* Replace the default memory allocation functions with user supplied one(s). */
nuclear@26 1996 extern PNG_EXPORT(void,png_set_mem_fn) PNGARG((png_structp png_ptr,
nuclear@26 1997 png_voidp mem_ptr, png_malloc_ptr malloc_fn, png_free_ptr free_fn));
nuclear@26 1998 /* Return the user pointer associated with the memory functions */
nuclear@26 1999 extern PNG_EXPORT(png_voidp,png_get_mem_ptr) PNGARG((png_structp png_ptr));
nuclear@26 2000 #endif
nuclear@26 2001
nuclear@26 2002 #if defined(PNG_READ_USER_TRANSFORM_SUPPORTED) || \
nuclear@26 2003 defined(PNG_LEGACY_SUPPORTED)
nuclear@26 2004 extern PNG_EXPORT(void,png_set_read_user_transform_fn) PNGARG((png_structp
nuclear@26 2005 png_ptr, png_user_transform_ptr read_user_transform_fn));
nuclear@26 2006 #endif
nuclear@26 2007
nuclear@26 2008 #if defined(PNG_WRITE_USER_TRANSFORM_SUPPORTED) || \
nuclear@26 2009 defined(PNG_LEGACY_SUPPORTED)
nuclear@26 2010 extern PNG_EXPORT(void,png_set_write_user_transform_fn) PNGARG((png_structp
nuclear@26 2011 png_ptr, png_user_transform_ptr write_user_transform_fn));
nuclear@26 2012 #endif
nuclear@26 2013
nuclear@26 2014 #if defined(PNG_READ_USER_TRANSFORM_SUPPORTED) || \
nuclear@26 2015 defined(PNG_WRITE_USER_TRANSFORM_SUPPORTED) || \
nuclear@26 2016 defined(PNG_LEGACY_SUPPORTED)
nuclear@26 2017 extern PNG_EXPORT(void,png_set_user_transform_info) PNGARG((png_structp
nuclear@26 2018 png_ptr, png_voidp user_transform_ptr, int user_transform_depth,
nuclear@26 2019 int user_transform_channels));
nuclear@26 2020 /* Return the user pointer associated with the user transform functions */
nuclear@26 2021 extern PNG_EXPORT(png_voidp,png_get_user_transform_ptr)
nuclear@26 2022 PNGARG((png_structp png_ptr));
nuclear@26 2023 #endif
nuclear@26 2024
nuclear@26 2025 #ifdef PNG_USER_CHUNKS_SUPPORTED
nuclear@26 2026 extern PNG_EXPORT(void,png_set_read_user_chunk_fn) PNGARG((png_structp png_ptr,
nuclear@26 2027 png_voidp user_chunk_ptr, png_user_chunk_ptr read_user_chunk_fn));
nuclear@26 2028 extern PNG_EXPORT(png_voidp,png_get_user_chunk_ptr) PNGARG((png_structp
nuclear@26 2029 png_ptr));
nuclear@26 2030 #endif
nuclear@26 2031
nuclear@26 2032 #ifdef PNG_PROGRESSIVE_READ_SUPPORTED
nuclear@26 2033 /* Sets the function callbacks for the push reader, and a pointer to a
nuclear@26 2034 * user-defined structure available to the callback functions.
nuclear@26 2035 */
nuclear@26 2036 extern PNG_EXPORT(void,png_set_progressive_read_fn) PNGARG((png_structp png_ptr,
nuclear@26 2037 png_voidp progressive_ptr,
nuclear@26 2038 png_progressive_info_ptr info_fn, png_progressive_row_ptr row_fn,
nuclear@26 2039 png_progressive_end_ptr end_fn));
nuclear@26 2040
nuclear@26 2041 /* returns the user pointer associated with the push read functions */
nuclear@26 2042 extern PNG_EXPORT(png_voidp,png_get_progressive_ptr)
nuclear@26 2043 PNGARG((png_structp png_ptr));
nuclear@26 2044
nuclear@26 2045 /* function to be called when data becomes available */
nuclear@26 2046 extern PNG_EXPORT(void,png_process_data) PNGARG((png_structp png_ptr,
nuclear@26 2047 png_infop info_ptr, png_bytep buffer, png_size_t buffer_size));
nuclear@26 2048
nuclear@26 2049 /* function that combines rows. Not very much different than the
nuclear@26 2050 * png_combine_row() call. Is this even used?????
nuclear@26 2051 */
nuclear@26 2052 extern PNG_EXPORT(void,png_progressive_combine_row) PNGARG((png_structp png_ptr,
nuclear@26 2053 png_bytep old_row, png_bytep new_row));
nuclear@26 2054 #endif /* PNG_PROGRESSIVE_READ_SUPPORTED */
nuclear@26 2055
nuclear@26 2056 extern PNG_EXPORT(png_voidp,png_malloc) PNGARG((png_structp png_ptr,
nuclear@26 2057 png_uint_32 size));
nuclear@26 2058
nuclear@26 2059 #if defined(PNG_1_0_X)
nuclear@26 2060 # define png_malloc_warn png_malloc
nuclear@26 2061 #else
nuclear@26 2062 /* Added at libpng version 1.2.4 */
nuclear@26 2063 extern PNG_EXPORT(png_voidp,png_malloc_warn) PNGARG((png_structp png_ptr,
nuclear@26 2064 png_uint_32 size));
nuclear@26 2065 #endif
nuclear@26 2066
nuclear@26 2067 /* frees a pointer allocated by png_malloc() */
nuclear@26 2068 extern PNG_EXPORT(void,png_free) PNGARG((png_structp png_ptr, png_voidp ptr));
nuclear@26 2069
nuclear@26 2070 #if defined(PNG_1_0_X)
nuclear@26 2071 /* Function to allocate memory for zlib. */
nuclear@26 2072 extern PNG_EXPORT(voidpf,png_zalloc) PNGARG((voidpf png_ptr, uInt items,
nuclear@26 2073 uInt size));
nuclear@26 2074
nuclear@26 2075 /* Function to free memory for zlib */
nuclear@26 2076 extern PNG_EXPORT(void,png_zfree) PNGARG((voidpf png_ptr, voidpf ptr));
nuclear@26 2077 #endif
nuclear@26 2078
nuclear@26 2079 /* Free data that was allocated internally */
nuclear@26 2080 extern PNG_EXPORT(void,png_free_data) PNGARG((png_structp png_ptr,
nuclear@26 2081 png_infop info_ptr, png_uint_32 free_me, int num));
nuclear@26 2082 #ifdef PNG_FREE_ME_SUPPORTED
nuclear@26 2083 /* Reassign responsibility for freeing existing data, whether allocated
nuclear@26 2084 * by libpng or by the application */
nuclear@26 2085 extern PNG_EXPORT(void,png_data_freer) PNGARG((png_structp png_ptr,
nuclear@26 2086 png_infop info_ptr, int freer, png_uint_32 mask));
nuclear@26 2087 #endif
nuclear@26 2088 /* assignments for png_data_freer */
nuclear@26 2089 #define PNG_DESTROY_WILL_FREE_DATA 1
nuclear@26 2090 #define PNG_SET_WILL_FREE_DATA 1
nuclear@26 2091 #define PNG_USER_WILL_FREE_DATA 2
nuclear@26 2092 /* Flags for png_ptr->free_me and info_ptr->free_me */
nuclear@26 2093 #define PNG_FREE_HIST 0x0008
nuclear@26 2094 #define PNG_FREE_ICCP 0x0010
nuclear@26 2095 #define PNG_FREE_SPLT 0x0020
nuclear@26 2096 #define PNG_FREE_ROWS 0x0040
nuclear@26 2097 #define PNG_FREE_PCAL 0x0080
nuclear@26 2098 #define PNG_FREE_SCAL 0x0100
nuclear@26 2099 #define PNG_FREE_UNKN 0x0200
nuclear@26 2100 #define PNG_FREE_LIST 0x0400
nuclear@26 2101 #define PNG_FREE_PLTE 0x1000
nuclear@26 2102 #define PNG_FREE_TRNS 0x2000
nuclear@26 2103 #define PNG_FREE_TEXT 0x4000
nuclear@26 2104 #define PNG_FREE_ALL 0x7fff
nuclear@26 2105 #define PNG_FREE_MUL 0x4220 /* PNG_FREE_SPLT|PNG_FREE_TEXT|PNG_FREE_UNKN */
nuclear@26 2106
nuclear@26 2107 #ifdef PNG_USER_MEM_SUPPORTED
nuclear@26 2108 extern PNG_EXPORT(png_voidp,png_malloc_default) PNGARG((png_structp png_ptr,
nuclear@26 2109 png_uint_32 size));
nuclear@26 2110 extern PNG_EXPORT(void,png_free_default) PNGARG((png_structp png_ptr,
nuclear@26 2111 png_voidp ptr));
nuclear@26 2112 #endif
nuclear@26 2113
nuclear@26 2114 extern PNG_EXPORT(png_voidp,png_memcpy_check) PNGARG((png_structp png_ptr,
nuclear@26 2115 png_voidp s1, png_voidp s2, png_uint_32 size));
nuclear@26 2116
nuclear@26 2117 extern PNG_EXPORT(png_voidp,png_memset_check) PNGARG((png_structp png_ptr,
nuclear@26 2118 png_voidp s1, int value, png_uint_32 size));
nuclear@26 2119
nuclear@26 2120 #if defined(USE_FAR_KEYWORD) /* memory model conversion function */
nuclear@26 2121 extern void *png_far_to_near PNGARG((png_structp png_ptr,png_voidp ptr,
nuclear@26 2122 int check));
nuclear@26 2123 #endif /* USE_FAR_KEYWORD */
nuclear@26 2124
nuclear@26 2125 #ifndef PNG_NO_ERROR_TEXT
nuclear@26 2126 /* Fatal error in PNG image of libpng - can't continue */
nuclear@26 2127 extern PNG_EXPORT(void,png_error) PNGARG((png_structp png_ptr,
nuclear@26 2128 png_const_charp error_message));
nuclear@26 2129
nuclear@26 2130 /* The same, but the chunk name is prepended to the error string. */
nuclear@26 2131 extern PNG_EXPORT(void,png_chunk_error) PNGARG((png_structp png_ptr,
nuclear@26 2132 png_const_charp error_message));
nuclear@26 2133 #else
nuclear@26 2134 /* Fatal error in PNG image of libpng - can't continue */
nuclear@26 2135 extern PNG_EXPORT(void,png_err) PNGARG((png_structp png_ptr));
nuclear@26 2136 #endif
nuclear@26 2137
nuclear@26 2138 #ifndef PNG_NO_WARNINGS
nuclear@26 2139 /* Non-fatal error in libpng. Can continue, but may have a problem. */
nuclear@26 2140 extern PNG_EXPORT(void,png_warning) PNGARG((png_structp png_ptr,
nuclear@26 2141 png_const_charp warning_message));
nuclear@26 2142
nuclear@26 2143 #ifdef PNG_READ_SUPPORTED
nuclear@26 2144 /* Non-fatal error in libpng, chunk name is prepended to message. */
nuclear@26 2145 extern PNG_EXPORT(void,png_chunk_warning) PNGARG((png_structp png_ptr,
nuclear@26 2146 png_const_charp warning_message));
nuclear@26 2147 #endif /* PNG_READ_SUPPORTED */
nuclear@26 2148 #endif /* PNG_NO_WARNINGS */
nuclear@26 2149
nuclear@26 2150 /* The png_set_<chunk> functions are for storing values in the png_info_struct.
nuclear@26 2151 * Similarly, the png_get_<chunk> calls are used to read values from the
nuclear@26 2152 * png_info_struct, either storing the parameters in the passed variables, or
nuclear@26 2153 * setting pointers into the png_info_struct where the data is stored. The
nuclear@26 2154 * png_get_<chunk> functions return a non-zero value if the data was available
nuclear@26 2155 * in info_ptr, or return zero and do not change any of the parameters if the
nuclear@26 2156 * data was not available.
nuclear@26 2157 *
nuclear@26 2158 * These functions should be used instead of directly accessing png_info
nuclear@26 2159 * to avoid problems with future changes in the size and internal layout of
nuclear@26 2160 * png_info_struct.
nuclear@26 2161 */
nuclear@26 2162 /* Returns "flag" if chunk data is valid in info_ptr. */
nuclear@26 2163 extern PNG_EXPORT(png_uint_32,png_get_valid) PNGARG((png_structp png_ptr,
nuclear@26 2164 png_infop info_ptr, png_uint_32 flag));
nuclear@26 2165
nuclear@26 2166 /* Returns number of bytes needed to hold a transformed row. */
nuclear@26 2167 extern PNG_EXPORT(png_uint_32,png_get_rowbytes) PNGARG((png_structp png_ptr,
nuclear@26 2168 png_infop info_ptr));
nuclear@26 2169
nuclear@26 2170 #if defined(PNG_INFO_IMAGE_SUPPORTED)
nuclear@26 2171 /* Returns row_pointers, which is an array of pointers to scanlines that was
nuclear@26 2172 returned from png_read_png(). */
nuclear@26 2173 extern PNG_EXPORT(png_bytepp,png_get_rows) PNGARG((png_structp png_ptr,
nuclear@26 2174 png_infop info_ptr));
nuclear@26 2175 /* Set row_pointers, which is an array of pointers to scanlines for use
nuclear@26 2176 by png_write_png(). */
nuclear@26 2177 extern PNG_EXPORT(void,png_set_rows) PNGARG((png_structp png_ptr,
nuclear@26 2178 png_infop info_ptr, png_bytepp row_pointers));
nuclear@26 2179 #endif
nuclear@26 2180
nuclear@26 2181 /* Returns number of color channels in image. */
nuclear@26 2182 extern PNG_EXPORT(png_byte,png_get_channels) PNGARG((png_structp png_ptr,
nuclear@26 2183 png_infop info_ptr));
nuclear@26 2184
nuclear@26 2185 #ifdef PNG_EASY_ACCESS_SUPPORTED
nuclear@26 2186 /* Returns image width in pixels. */
nuclear@26 2187 extern PNG_EXPORT(png_uint_32, png_get_image_width) PNGARG((png_structp
nuclear@26 2188 png_ptr, png_infop info_ptr));
nuclear@26 2189
nuclear@26 2190 /* Returns image height in pixels. */
nuclear@26 2191 extern PNG_EXPORT(png_uint_32, png_get_image_height) PNGARG((png_structp
nuclear@26 2192 png_ptr, png_infop info_ptr));
nuclear@26 2193
nuclear@26 2194 /* Returns image bit_depth. */
nuclear@26 2195 extern PNG_EXPORT(png_byte, png_get_bit_depth) PNGARG((png_structp
nuclear@26 2196 png_ptr, png_infop info_ptr));
nuclear@26 2197
nuclear@26 2198 /* Returns image color_type. */
nuclear@26 2199 extern PNG_EXPORT(png_byte, png_get_color_type) PNGARG((png_structp
nuclear@26 2200 png_ptr, png_infop info_ptr));
nuclear@26 2201
nuclear@26 2202 /* Returns image filter_type. */
nuclear@26 2203 extern PNG_EXPORT(png_byte, png_get_filter_type) PNGARG((png_structp
nuclear@26 2204 png_ptr, png_infop info_ptr));
nuclear@26 2205
nuclear@26 2206 /* Returns image interlace_type. */
nuclear@26 2207 extern PNG_EXPORT(png_byte, png_get_interlace_type) PNGARG((png_structp
nuclear@26 2208 png_ptr, png_infop info_ptr));
nuclear@26 2209
nuclear@26 2210 /* Returns image compression_type. */
nuclear@26 2211 extern PNG_EXPORT(png_byte, png_get_compression_type) PNGARG((png_structp
nuclear@26 2212 png_ptr, png_infop info_ptr));
nuclear@26 2213
nuclear@26 2214 /* Returns image resolution in pixels per meter, from pHYs chunk data. */
nuclear@26 2215 extern PNG_EXPORT(png_uint_32, png_get_pixels_per_meter) PNGARG((png_structp
nuclear@26 2216 png_ptr, png_infop info_ptr));
nuclear@26 2217 extern PNG_EXPORT(png_uint_32, png_get_x_pixels_per_meter) PNGARG((png_structp
nuclear@26 2218 png_ptr, png_infop info_ptr));
nuclear@26 2219 extern PNG_EXPORT(png_uint_32, png_get_y_pixels_per_meter) PNGARG((png_structp
nuclear@26 2220 png_ptr, png_infop info_ptr));
nuclear@26 2221
nuclear@26 2222 /* Returns pixel aspect ratio, computed from pHYs chunk data. */
nuclear@26 2223 #ifdef PNG_FLOATING_POINT_SUPPORTED
nuclear@26 2224 extern PNG_EXPORT(float, png_get_pixel_aspect_ratio) PNGARG((png_structp
nuclear@26 2225 png_ptr, png_infop info_ptr));
nuclear@26 2226 #endif
nuclear@26 2227
nuclear@26 2228 /* Returns image x, y offset in pixels or microns, from oFFs chunk data. */
nuclear@26 2229 extern PNG_EXPORT(png_int_32, png_get_x_offset_pixels) PNGARG((png_structp
nuclear@26 2230 png_ptr, png_infop info_ptr));
nuclear@26 2231 extern PNG_EXPORT(png_int_32, png_get_y_offset_pixels) PNGARG((png_structp
nuclear@26 2232 png_ptr, png_infop info_ptr));
nuclear@26 2233 extern PNG_EXPORT(png_int_32, png_get_x_offset_microns) PNGARG((png_structp
nuclear@26 2234 png_ptr, png_infop info_ptr));
nuclear@26 2235 extern PNG_EXPORT(png_int_32, png_get_y_offset_microns) PNGARG((png_structp
nuclear@26 2236 png_ptr, png_infop info_ptr));
nuclear@26 2237
nuclear@26 2238 #endif /* PNG_EASY_ACCESS_SUPPORTED */
nuclear@26 2239
nuclear@26 2240 /* Returns pointer to signature string read from PNG header */
nuclear@26 2241 extern PNG_EXPORT(png_bytep,png_get_signature) PNGARG((png_structp png_ptr,
nuclear@26 2242 png_infop info_ptr));
nuclear@26 2243
nuclear@26 2244 #if defined(PNG_bKGD_SUPPORTED)
nuclear@26 2245 extern PNG_EXPORT(png_uint_32,png_get_bKGD) PNGARG((png_structp png_ptr,
nuclear@26 2246 png_infop info_ptr, png_color_16p *background));
nuclear@26 2247 #endif
nuclear@26 2248
nuclear@26 2249 #if defined(PNG_bKGD_SUPPORTED)
nuclear@26 2250 extern PNG_EXPORT(void,png_set_bKGD) PNGARG((png_structp png_ptr,
nuclear@26 2251 png_infop info_ptr, png_color_16p background));
nuclear@26 2252 #endif
nuclear@26 2253
nuclear@26 2254 #if defined(PNG_cHRM_SUPPORTED)
nuclear@26 2255 #ifdef PNG_FLOATING_POINT_SUPPORTED
nuclear@26 2256 extern PNG_EXPORT(png_uint_32,png_get_cHRM) PNGARG((png_structp png_ptr,
nuclear@26 2257 png_infop info_ptr, double *white_x, double *white_y, double *red_x,
nuclear@26 2258 double *red_y, double *green_x, double *green_y, double *blue_x,
nuclear@26 2259 double *blue_y));
nuclear@26 2260 #endif
nuclear@26 2261 #ifdef PNG_FIXED_POINT_SUPPORTED
nuclear@26 2262 extern PNG_EXPORT(png_uint_32,png_get_cHRM_fixed) PNGARG((png_structp png_ptr,
nuclear@26 2263 png_infop info_ptr, png_fixed_point *int_white_x, png_fixed_point
nuclear@26 2264 *int_white_y, png_fixed_point *int_red_x, png_fixed_point *int_red_y,
nuclear@26 2265 png_fixed_point *int_green_x, png_fixed_point *int_green_y, png_fixed_point
nuclear@26 2266 *int_blue_x, png_fixed_point *int_blue_y));
nuclear@26 2267 #endif
nuclear@26 2268 #endif
nuclear@26 2269
nuclear@26 2270 #if defined(PNG_cHRM_SUPPORTED)
nuclear@26 2271 #ifdef PNG_FLOATING_POINT_SUPPORTED
nuclear@26 2272 extern PNG_EXPORT(void,png_set_cHRM) PNGARG((png_structp png_ptr,
nuclear@26 2273 png_infop info_ptr, double white_x, double white_y, double red_x,
nuclear@26 2274 double red_y, double green_x, double green_y, double blue_x, double blue_y));
nuclear@26 2275 #endif
nuclear@26 2276 #ifdef PNG_FIXED_POINT_SUPPORTED
nuclear@26 2277 extern PNG_EXPORT(void,png_set_cHRM_fixed) PNGARG((png_structp png_ptr,
nuclear@26 2278 png_infop info_ptr, png_fixed_point int_white_x, png_fixed_point int_white_y,
nuclear@26 2279 png_fixed_point int_red_x, png_fixed_point int_red_y, png_fixed_point
nuclear@26 2280 int_green_x, png_fixed_point int_green_y, png_fixed_point int_blue_x,
nuclear@26 2281 png_fixed_point int_blue_y));
nuclear@26 2282 #endif
nuclear@26 2283 #endif
nuclear@26 2284
nuclear@26 2285 #if defined(PNG_gAMA_SUPPORTED)
nuclear@26 2286 #ifdef PNG_FLOATING_POINT_SUPPORTED
nuclear@26 2287 extern PNG_EXPORT(png_uint_32,png_get_gAMA) PNGARG((png_structp png_ptr,
nuclear@26 2288 png_infop info_ptr, double *file_gamma));
nuclear@26 2289 #endif
nuclear@26 2290 extern PNG_EXPORT(png_uint_32,png_get_gAMA_fixed) PNGARG((png_structp png_ptr,
nuclear@26 2291 png_infop info_ptr, png_fixed_point *int_file_gamma));
nuclear@26 2292 #endif
nuclear@26 2293
nuclear@26 2294 #if defined(PNG_gAMA_SUPPORTED)
nuclear@26 2295 #ifdef PNG_FLOATING_POINT_SUPPORTED
nuclear@26 2296 extern PNG_EXPORT(void,png_set_gAMA) PNGARG((png_structp png_ptr,
nuclear@26 2297 png_infop info_ptr, double file_gamma));
nuclear@26 2298 #endif
nuclear@26 2299 extern PNG_EXPORT(void,png_set_gAMA_fixed) PNGARG((png_structp png_ptr,
nuclear@26 2300 png_infop info_ptr, png_fixed_point int_file_gamma));
nuclear@26 2301 #endif
nuclear@26 2302
nuclear@26 2303 #if defined(PNG_hIST_SUPPORTED)
nuclear@26 2304 extern PNG_EXPORT(png_uint_32,png_get_hIST) PNGARG((png_structp png_ptr,
nuclear@26 2305 png_infop info_ptr, png_uint_16p *hist));
nuclear@26 2306 #endif
nuclear@26 2307
nuclear@26 2308 #if defined(PNG_hIST_SUPPORTED)
nuclear@26 2309 extern PNG_EXPORT(void,png_set_hIST) PNGARG((png_structp png_ptr,
nuclear@26 2310 png_infop info_ptr, png_uint_16p hist));
nuclear@26 2311 #endif
nuclear@26 2312
nuclear@26 2313 extern PNG_EXPORT(png_uint_32,png_get_IHDR) PNGARG((png_structp png_ptr,
nuclear@26 2314 png_infop info_ptr, png_uint_32 *width, png_uint_32 *height,
nuclear@26 2315 int *bit_depth, int *color_type, int *interlace_method,
nuclear@26 2316 int *compression_method, int *filter_method));
nuclear@26 2317
nuclear@26 2318 extern PNG_EXPORT(void,png_set_IHDR) PNGARG((png_structp png_ptr,
nuclear@26 2319 png_infop info_ptr, png_uint_32 width, png_uint_32 height, int bit_depth,
nuclear@26 2320 int color_type, int interlace_method, int compression_method,
nuclear@26 2321 int filter_method));
nuclear@26 2322
nuclear@26 2323 #if defined(PNG_oFFs_SUPPORTED)
nuclear@26 2324 extern PNG_EXPORT(png_uint_32,png_get_oFFs) PNGARG((png_structp png_ptr,
nuclear@26 2325 png_infop info_ptr, png_int_32 *offset_x, png_int_32 *offset_y,
nuclear@26 2326 int *unit_type));
nuclear@26 2327 #endif
nuclear@26 2328
nuclear@26 2329 #if defined(PNG_oFFs_SUPPORTED)
nuclear@26 2330 extern PNG_EXPORT(void,png_set_oFFs) PNGARG((png_structp png_ptr,
nuclear@26 2331 png_infop info_ptr, png_int_32 offset_x, png_int_32 offset_y,
nuclear@26 2332 int unit_type));
nuclear@26 2333 #endif
nuclear@26 2334
nuclear@26 2335 #if defined(PNG_pCAL_SUPPORTED)
nuclear@26 2336 extern PNG_EXPORT(png_uint_32,png_get_pCAL) PNGARG((png_structp png_ptr,
nuclear@26 2337 png_infop info_ptr, png_charp *purpose, png_int_32 *X0, png_int_32 *X1,
nuclear@26 2338 int *type, int *nparams, png_charp *units, png_charpp *params));
nuclear@26 2339 #endif
nuclear@26 2340
nuclear@26 2341 #if defined(PNG_pCAL_SUPPORTED)
nuclear@26 2342 extern PNG_EXPORT(void,png_set_pCAL) PNGARG((png_structp png_ptr,
nuclear@26 2343 png_infop info_ptr, png_charp purpose, png_int_32 X0, png_int_32 X1,
nuclear@26 2344 int type, int nparams, png_charp units, png_charpp params));
nuclear@26 2345 #endif
nuclear@26 2346
nuclear@26 2347 #if defined(PNG_pHYs_SUPPORTED)
nuclear@26 2348 extern PNG_EXPORT(png_uint_32,png_get_pHYs) PNGARG((png_structp png_ptr,
nuclear@26 2349 png_infop info_ptr, png_uint_32 *res_x, png_uint_32 *res_y, int *unit_type));
nuclear@26 2350 #endif
nuclear@26 2351
nuclear@26 2352 #if defined(PNG_pHYs_SUPPORTED)
nuclear@26 2353 extern PNG_EXPORT(void,png_set_pHYs) PNGARG((png_structp png_ptr,
nuclear@26 2354 png_infop info_ptr, png_uint_32 res_x, png_uint_32 res_y, int unit_type));
nuclear@26 2355 #endif
nuclear@26 2356
nuclear@26 2357 extern PNG_EXPORT(png_uint_32,png_get_PLTE) PNGARG((png_structp png_ptr,
nuclear@26 2358 png_infop info_ptr, png_colorp *palette, int *num_palette));
nuclear@26 2359
nuclear@26 2360 extern PNG_EXPORT(void,png_set_PLTE) PNGARG((png_structp png_ptr,
nuclear@26 2361 png_infop info_ptr, png_colorp palette, int num_palette));
nuclear@26 2362
nuclear@26 2363 #if defined(PNG_sBIT_SUPPORTED)
nuclear@26 2364 extern PNG_EXPORT(png_uint_32,png_get_sBIT) PNGARG((png_structp png_ptr,
nuclear@26 2365 png_infop info_ptr, png_color_8p *sig_bit));
nuclear@26 2366 #endif
nuclear@26 2367
nuclear@26 2368 #if defined(PNG_sBIT_SUPPORTED)
nuclear@26 2369 extern PNG_EXPORT(void,png_set_sBIT) PNGARG((png_structp png_ptr,
nuclear@26 2370 png_infop info_ptr, png_color_8p sig_bit));
nuclear@26 2371 #endif
nuclear@26 2372
nuclear@26 2373 #if defined(PNG_sRGB_SUPPORTED)
nuclear@26 2374 extern PNG_EXPORT(png_uint_32,png_get_sRGB) PNGARG((png_structp png_ptr,
nuclear@26 2375 png_infop info_ptr, int *intent));
nuclear@26 2376 #endif
nuclear@26 2377
nuclear@26 2378 #if defined(PNG_sRGB_SUPPORTED)
nuclear@26 2379 extern PNG_EXPORT(void,png_set_sRGB) PNGARG((png_structp png_ptr,
nuclear@26 2380 png_infop info_ptr, int intent));
nuclear@26 2381 extern PNG_EXPORT(void,png_set_sRGB_gAMA_and_cHRM) PNGARG((png_structp png_ptr,
nuclear@26 2382 png_infop info_ptr, int intent));
nuclear@26 2383 #endif
nuclear@26 2384
nuclear@26 2385 #if defined(PNG_iCCP_SUPPORTED)
nuclear@26 2386 extern PNG_EXPORT(png_uint_32,png_get_iCCP) PNGARG((png_structp png_ptr,
nuclear@26 2387 png_infop info_ptr, png_charpp name, int *compression_type,
nuclear@26 2388 png_charpp profile, png_uint_32 *proflen));
nuclear@26 2389 /* Note to maintainer: profile should be png_bytepp */
nuclear@26 2390 #endif
nuclear@26 2391
nuclear@26 2392 #if defined(PNG_iCCP_SUPPORTED)
nuclear@26 2393 extern PNG_EXPORT(void,png_set_iCCP) PNGARG((png_structp png_ptr,
nuclear@26 2394 png_infop info_ptr, png_charp name, int compression_type,
nuclear@26 2395 png_charp profile, png_uint_32 proflen));
nuclear@26 2396 /* Note to maintainer: profile should be png_bytep */
nuclear@26 2397 #endif
nuclear@26 2398
nuclear@26 2399 #if defined(PNG_sPLT_SUPPORTED)
nuclear@26 2400 extern PNG_EXPORT(png_uint_32,png_get_sPLT) PNGARG((png_structp png_ptr,
nuclear@26 2401 png_infop info_ptr, png_sPLT_tpp entries));
nuclear@26 2402 #endif
nuclear@26 2403
nuclear@26 2404 #if defined(PNG_sPLT_SUPPORTED)
nuclear@26 2405 extern PNG_EXPORT(void,png_set_sPLT) PNGARG((png_structp png_ptr,
nuclear@26 2406 png_infop info_ptr, png_sPLT_tp entries, int nentries));
nuclear@26 2407 #endif
nuclear@26 2408
nuclear@26 2409 #if defined(PNG_TEXT_SUPPORTED)
nuclear@26 2410 /* png_get_text also returns the number of text chunks in *num_text */
nuclear@26 2411 extern PNG_EXPORT(png_uint_32,png_get_text) PNGARG((png_structp png_ptr,
nuclear@26 2412 png_infop info_ptr, png_textp *text_ptr, int *num_text));
nuclear@26 2413 #endif
nuclear@26 2414
nuclear@26 2415 /*
nuclear@26 2416 * Note while png_set_text() will accept a structure whose text,
nuclear@26 2417 * language, and translated keywords are NULL pointers, the structure
nuclear@26 2418 * returned by png_get_text will always contain regular
nuclear@26 2419 * zero-terminated C strings. They might be empty strings but
nuclear@26 2420 * they will never be NULL pointers.
nuclear@26 2421 */
nuclear@26 2422
nuclear@26 2423 #if defined(PNG_TEXT_SUPPORTED)
nuclear@26 2424 extern PNG_EXPORT(void,png_set_text) PNGARG((png_structp png_ptr,
nuclear@26 2425 png_infop info_ptr, png_textp text_ptr, int num_text));
nuclear@26 2426 #endif
nuclear@26 2427
nuclear@26 2428 #if defined(PNG_tIME_SUPPORTED)
nuclear@26 2429 extern PNG_EXPORT(png_uint_32,png_get_tIME) PNGARG((png_structp png_ptr,
nuclear@26 2430 png_infop info_ptr, png_timep *mod_time));
nuclear@26 2431 #endif
nuclear@26 2432
nuclear@26 2433 #if defined(PNG_tIME_SUPPORTED)
nuclear@26 2434 extern PNG_EXPORT(void,png_set_tIME) PNGARG((png_structp png_ptr,
nuclear@26 2435 png_infop info_ptr, png_timep mod_time));
nuclear@26 2436 #endif
nuclear@26 2437
nuclear@26 2438 #if defined(PNG_tRNS_SUPPORTED)
nuclear@26 2439 extern PNG_EXPORT(png_uint_32,png_get_tRNS) PNGARG((png_structp png_ptr,
nuclear@26 2440 png_infop info_ptr, png_bytep *trans, int *num_trans,
nuclear@26 2441 png_color_16p *trans_values));
nuclear@26 2442 #endif
nuclear@26 2443
nuclear@26 2444 #if defined(PNG_tRNS_SUPPORTED)
nuclear@26 2445 extern PNG_EXPORT(void,png_set_tRNS) PNGARG((png_structp png_ptr,
nuclear@26 2446 png_infop info_ptr, png_bytep trans, int num_trans,
nuclear@26 2447 png_color_16p trans_values));
nuclear@26 2448 #endif
nuclear@26 2449
nuclear@26 2450 #if defined(PNG_tRNS_SUPPORTED)
nuclear@26 2451 #endif
nuclear@26 2452
nuclear@26 2453 #if defined(PNG_sCAL_SUPPORTED)
nuclear@26 2454 #ifdef PNG_FLOATING_POINT_SUPPORTED
nuclear@26 2455 extern PNG_EXPORT(png_uint_32,png_get_sCAL) PNGARG((png_structp png_ptr,
nuclear@26 2456 png_infop info_ptr, int *unit, double *width, double *height));
nuclear@26 2457 #else
nuclear@26 2458 #ifdef PNG_FIXED_POINT_SUPPORTED
nuclear@26 2459 extern PNG_EXPORT(png_uint_32,png_get_sCAL_s) PNGARG((png_structp png_ptr,
nuclear@26 2460 png_infop info_ptr, int *unit, png_charpp swidth, png_charpp sheight));
nuclear@26 2461 #endif
nuclear@26 2462 #endif
nuclear@26 2463 #endif /* PNG_sCAL_SUPPORTED */
nuclear@26 2464
nuclear@26 2465 #if defined(PNG_sCAL_SUPPORTED)
nuclear@26 2466 #ifdef PNG_FLOATING_POINT_SUPPORTED
nuclear@26 2467 extern PNG_EXPORT(void,png_set_sCAL) PNGARG((png_structp png_ptr,
nuclear@26 2468 png_infop info_ptr, int unit, double width, double height));
nuclear@26 2469 #else
nuclear@26 2470 #ifdef PNG_FIXED_POINT_SUPPORTED
nuclear@26 2471 extern PNG_EXPORT(void,png_set_sCAL_s) PNGARG((png_structp png_ptr,
nuclear@26 2472 png_infop info_ptr, int unit, png_charp swidth, png_charp sheight));
nuclear@26 2473 #endif
nuclear@26 2474 #endif
nuclear@26 2475 #endif /* PNG_sCAL_SUPPORTED || PNG_WRITE_sCAL_SUPPORTED */
nuclear@26 2476
nuclear@26 2477 #if defined(PNG_UNKNOWN_CHUNKS_SUPPORTED)
nuclear@26 2478 /* provide a list of chunks and how they are to be handled, if the built-in
nuclear@26 2479 handling or default unknown chunk handling is not desired. Any chunks not
nuclear@26 2480 listed will be handled in the default manner. The IHDR and IEND chunks
nuclear@26 2481 must not be listed.
nuclear@26 2482 keep = 0: follow default behaviour
nuclear@26 2483 = 1: do not keep
nuclear@26 2484 = 2: keep only if safe-to-copy
nuclear@26 2485 = 3: keep even if unsafe-to-copy
nuclear@26 2486 */
nuclear@26 2487 extern PNG_EXPORT(void, png_set_keep_unknown_chunks) PNGARG((png_structp
nuclear@26 2488 png_ptr, int keep, png_bytep chunk_list, int num_chunks));
nuclear@26 2489 extern PNG_EXPORT(void, png_set_unknown_chunks) PNGARG((png_structp png_ptr,
nuclear@26 2490 png_infop info_ptr, png_unknown_chunkp unknowns, int num_unknowns));
nuclear@26 2491 extern PNG_EXPORT(void, png_set_unknown_chunk_location)
nuclear@26 2492 PNGARG((png_structp png_ptr, png_infop info_ptr, int chunk, int location));
nuclear@26 2493 extern PNG_EXPORT(png_uint_32,png_get_unknown_chunks) PNGARG((png_structp
nuclear@26 2494 png_ptr, png_infop info_ptr, png_unknown_chunkpp entries));
nuclear@26 2495 #endif
nuclear@26 2496 #ifdef PNG_HANDLE_AS_UNKNOWN_SUPPORTED
nuclear@26 2497 PNG_EXPORT(int,png_handle_as_unknown) PNGARG((png_structp png_ptr, png_bytep
nuclear@26 2498 chunk_name));
nuclear@26 2499 #endif
nuclear@26 2500
nuclear@26 2501 /* Png_free_data() will turn off the "valid" flag for anything it frees.
nuclear@26 2502 If you need to turn it off for a chunk that your application has freed,
nuclear@26 2503 you can use png_set_invalid(png_ptr, info_ptr, PNG_INFO_CHNK); */
nuclear@26 2504 extern PNG_EXPORT(void, png_set_invalid) PNGARG((png_structp png_ptr,
nuclear@26 2505 png_infop info_ptr, int mask));
nuclear@26 2506
nuclear@26 2507 #if defined(PNG_INFO_IMAGE_SUPPORTED)
nuclear@26 2508 /* The "params" pointer is currently not used and is for future expansion. */
nuclear@26 2509 extern PNG_EXPORT(void, png_read_png) PNGARG((png_structp png_ptr,
nuclear@26 2510 png_infop info_ptr,
nuclear@26 2511 int transforms,
nuclear@26 2512 png_voidp params));
nuclear@26 2513 extern PNG_EXPORT(void, png_write_png) PNGARG((png_structp png_ptr,
nuclear@26 2514 png_infop info_ptr,
nuclear@26 2515 int transforms,
nuclear@26 2516 png_voidp params));
nuclear@26 2517 #endif
nuclear@26 2518
nuclear@26 2519 /* Define PNG_DEBUG at compile time for debugging information. Higher
nuclear@26 2520 * numbers for PNG_DEBUG mean more debugging information. This has
nuclear@26 2521 * only been added since version 0.95 so it is not implemented throughout
nuclear@26 2522 * libpng yet, but more support will be added as needed.
nuclear@26 2523 */
nuclear@26 2524 #ifdef PNG_DEBUG
nuclear@26 2525 #if (PNG_DEBUG > 0)
nuclear@26 2526 #if !defined(PNG_DEBUG_FILE) && defined(_MSC_VER)
nuclear@26 2527 #include <crtdbg.h>
nuclear@26 2528 #if (PNG_DEBUG > 1)
nuclear@26 2529 #define png_debug(l,m) _RPT0(_CRT_WARN,m)
nuclear@26 2530 #define png_debug1(l,m,p1) _RPT1(_CRT_WARN,m,p1)
nuclear@26 2531 #define png_debug2(l,m,p1,p2) _RPT2(_CRT_WARN,m,p1,p2)
nuclear@26 2532 #endif
nuclear@26 2533 #else /* PNG_DEBUG_FILE || !_MSC_VER */
nuclear@26 2534 #ifndef PNG_DEBUG_FILE
nuclear@26 2535 #define PNG_DEBUG_FILE stderr
nuclear@26 2536 #endif /* PNG_DEBUG_FILE */
nuclear@26 2537 #if (PNG_DEBUG > 1)
nuclear@26 2538 #define png_debug(l,m) \
nuclear@26 2539 { \
nuclear@26 2540 int num_tabs=l; \
nuclear@26 2541 fprintf(PNG_DEBUG_FILE,"%s"m,(num_tabs==1 ? "\t" : \
nuclear@26 2542 (num_tabs==2 ? "\t\t":(num_tabs>2 ? "\t\t\t":"")))); \
nuclear@26 2543 }
nuclear@26 2544 #define png_debug1(l,m,p1) \
nuclear@26 2545 { \
nuclear@26 2546 int num_tabs=l; \
nuclear@26 2547 fprintf(PNG_DEBUG_FILE,"%s"m,(num_tabs==1 ? "\t" : \
nuclear@26 2548 (num_tabs==2 ? "\t\t":(num_tabs>2 ? "\t\t\t":""))),p1); \
nuclear@26 2549 }
nuclear@26 2550 #define png_debug2(l,m,p1,p2) \
nuclear@26 2551 { \
nuclear@26 2552 int num_tabs=l; \
nuclear@26 2553 fprintf(PNG_DEBUG_FILE,"%s"m,(num_tabs==1 ? "\t" : \
nuclear@26 2554 (num_tabs==2 ? "\t\t":(num_tabs>2 ? "\t\t\t":""))),p1,p2); \
nuclear@26 2555 }
nuclear@26 2556 #endif /* (PNG_DEBUG > 1) */
nuclear@26 2557 #endif /* _MSC_VER */
nuclear@26 2558 #endif /* (PNG_DEBUG > 0) */
nuclear@26 2559 #endif /* PNG_DEBUG */
nuclear@26 2560 #ifndef png_debug
nuclear@26 2561 #define png_debug(l, m)
nuclear@26 2562 #endif
nuclear@26 2563 #ifndef png_debug1
nuclear@26 2564 #define png_debug1(l, m, p1)
nuclear@26 2565 #endif
nuclear@26 2566 #ifndef png_debug2
nuclear@26 2567 #define png_debug2(l, m, p1, p2)
nuclear@26 2568 #endif
nuclear@26 2569
nuclear@26 2570 extern PNG_EXPORT(png_charp,png_get_copyright) PNGARG((png_structp png_ptr));
nuclear@26 2571 extern PNG_EXPORT(png_charp,png_get_header_ver) PNGARG((png_structp png_ptr));
nuclear@26 2572 extern PNG_EXPORT(png_charp,png_get_header_version) PNGARG((png_structp png_ptr));
nuclear@26 2573 extern PNG_EXPORT(png_charp,png_get_libpng_ver) PNGARG((png_structp png_ptr));
nuclear@26 2574
nuclear@26 2575 #ifdef PNG_MNG_FEATURES_SUPPORTED
nuclear@26 2576 extern PNG_EXPORT(png_uint_32,png_permit_mng_features) PNGARG((png_structp
nuclear@26 2577 png_ptr, png_uint_32 mng_features_permitted));
nuclear@26 2578 #endif
nuclear@26 2579
nuclear@26 2580 /* For use in png_set_keep_unknown, added to version 1.2.6 */
nuclear@26 2581 #define PNG_HANDLE_CHUNK_AS_DEFAULT 0
nuclear@26 2582 #define PNG_HANDLE_CHUNK_NEVER 1
nuclear@26 2583 #define PNG_HANDLE_CHUNK_IF_SAFE 2
nuclear@26 2584 #define PNG_HANDLE_CHUNK_ALWAYS 3
nuclear@26 2585
nuclear@26 2586 /* Added to version 1.2.0 */
nuclear@26 2587 #if defined(PNG_ASSEMBLER_CODE_SUPPORTED)
nuclear@26 2588 #if defined(PNG_MMX_CODE_SUPPORTED)
nuclear@26 2589 #define PNG_ASM_FLAG_MMX_SUPPORT_COMPILED 0x01 /* not user-settable */
nuclear@26 2590 #define PNG_ASM_FLAG_MMX_SUPPORT_IN_CPU 0x02 /* not user-settable */
nuclear@26 2591 #define PNG_ASM_FLAG_MMX_READ_COMBINE_ROW 0x04
nuclear@26 2592 #define PNG_ASM_FLAG_MMX_READ_INTERLACE 0x08
nuclear@26 2593 #define PNG_ASM_FLAG_MMX_READ_FILTER_SUB 0x10
nuclear@26 2594 #define PNG_ASM_FLAG_MMX_READ_FILTER_UP 0x20
nuclear@26 2595 #define PNG_ASM_FLAG_MMX_READ_FILTER_AVG 0x40
nuclear@26 2596 #define PNG_ASM_FLAG_MMX_READ_FILTER_PAETH 0x80
nuclear@26 2597 #define PNG_ASM_FLAGS_INITIALIZED 0x80000000 /* not user-settable */
nuclear@26 2598
nuclear@26 2599 #define PNG_MMX_READ_FLAGS ( PNG_ASM_FLAG_MMX_READ_COMBINE_ROW \
nuclear@26 2600 | PNG_ASM_FLAG_MMX_READ_INTERLACE \
nuclear@26 2601 | PNG_ASM_FLAG_MMX_READ_FILTER_SUB \
nuclear@26 2602 | PNG_ASM_FLAG_MMX_READ_FILTER_UP \
nuclear@26 2603 | PNG_ASM_FLAG_MMX_READ_FILTER_AVG \
nuclear@26 2604 | PNG_ASM_FLAG_MMX_READ_FILTER_PAETH )
nuclear@26 2605 #define PNG_MMX_WRITE_FLAGS ( 0 )
nuclear@26 2606
nuclear@26 2607 #define PNG_MMX_FLAGS ( PNG_ASM_FLAG_MMX_SUPPORT_COMPILED \
nuclear@26 2608 | PNG_ASM_FLAG_MMX_SUPPORT_IN_CPU \
nuclear@26 2609 | PNG_MMX_READ_FLAGS \
nuclear@26 2610 | PNG_MMX_WRITE_FLAGS )
nuclear@26 2611
nuclear@26 2612 #define PNG_SELECT_READ 1
nuclear@26 2613 #define PNG_SELECT_WRITE 2
nuclear@26 2614 #endif /* PNG_MMX_CODE_SUPPORTED */
nuclear@26 2615
nuclear@26 2616 #if !defined(PNG_1_0_X)
nuclear@26 2617 /* pngget.c */
nuclear@26 2618 extern PNG_EXPORT(png_uint_32,png_get_mmx_flagmask)
nuclear@26 2619 PNGARG((int flag_select, int *compilerID));
nuclear@26 2620
nuclear@26 2621 /* pngget.c */
nuclear@26 2622 extern PNG_EXPORT(png_uint_32,png_get_asm_flagmask)
nuclear@26 2623 PNGARG((int flag_select));
nuclear@26 2624
nuclear@26 2625 /* pngget.c */
nuclear@26 2626 extern PNG_EXPORT(png_uint_32,png_get_asm_flags)
nuclear@26 2627 PNGARG((png_structp png_ptr));
nuclear@26 2628
nuclear@26 2629 /* pngget.c */
nuclear@26 2630 extern PNG_EXPORT(png_byte,png_get_mmx_bitdepth_threshold)
nuclear@26 2631 PNGARG((png_structp png_ptr));
nuclear@26 2632
nuclear@26 2633 /* pngget.c */
nuclear@26 2634 extern PNG_EXPORT(png_uint_32,png_get_mmx_rowbytes_threshold)
nuclear@26 2635 PNGARG((png_structp png_ptr));
nuclear@26 2636
nuclear@26 2637 /* pngset.c */
nuclear@26 2638 extern PNG_EXPORT(void,png_set_asm_flags)
nuclear@26 2639 PNGARG((png_structp png_ptr, png_uint_32 asm_flags));
nuclear@26 2640
nuclear@26 2641 /* pngset.c */
nuclear@26 2642 extern PNG_EXPORT(void,png_set_mmx_thresholds)
nuclear@26 2643 PNGARG((png_structp png_ptr, png_byte mmx_bitdepth_threshold,
nuclear@26 2644 png_uint_32 mmx_rowbytes_threshold));
nuclear@26 2645
nuclear@26 2646 #endif /* PNG_1_0_X */
nuclear@26 2647
nuclear@26 2648 #if !defined(PNG_1_0_X)
nuclear@26 2649 /* png.c, pnggccrd.c, or pngvcrd.c */
nuclear@26 2650 extern PNG_EXPORT(int,png_mmx_support) PNGARG((void));
nuclear@26 2651 #endif /* PNG_ASSEMBLER_CODE_SUPPORTED */
nuclear@26 2652
nuclear@26 2653 /* Strip the prepended error numbers ("#nnn ") from error and warning
nuclear@26 2654 * messages before passing them to the error or warning handler. */
nuclear@26 2655 #ifdef PNG_ERROR_NUMBERS_SUPPORTED
nuclear@26 2656 extern PNG_EXPORT(void,png_set_strip_error_numbers) PNGARG((png_structp
nuclear@26 2657 png_ptr, png_uint_32 strip_mode));
nuclear@26 2658 #endif
nuclear@26 2659
nuclear@26 2660 #endif /* PNG_1_0_X */
nuclear@26 2661
nuclear@26 2662 /* Added at libpng-1.2.6 */
nuclear@26 2663 #ifdef PNG_SET_USER_LIMITS_SUPPORTED
nuclear@26 2664 extern PNG_EXPORT(void,png_set_user_limits) PNGARG((png_structp
nuclear@26 2665 png_ptr, png_uint_32 user_width_max, png_uint_32 user_height_max));
nuclear@26 2666 extern PNG_EXPORT(png_uint_32,png_get_user_width_max) PNGARG((png_structp
nuclear@26 2667 png_ptr));
nuclear@26 2668 extern PNG_EXPORT(png_uint_32,png_get_user_height_max) PNGARG((png_structp
nuclear@26 2669 png_ptr));
nuclear@26 2670 #endif
nuclear@26 2671
nuclear@26 2672
nuclear@26 2673 /* Maintainer: Put new public prototypes here ^, in libpng.3, and project defs */
nuclear@26 2674
nuclear@26 2675 #ifdef PNG_READ_COMPOSITE_NODIV_SUPPORTED
nuclear@26 2676 /* With these routines we avoid an integer divide, which will be slower on
nuclear@26 2677 * most machines. However, it does take more operations than the corresponding
nuclear@26 2678 * divide method, so it may be slower on a few RISC systems. There are two
nuclear@26 2679 * shifts (by 8 or 16 bits) and an addition, versus a single integer divide.
nuclear@26 2680 *
nuclear@26 2681 * Note that the rounding factors are NOT supposed to be the same! 128 and
nuclear@26 2682 * 32768 are correct for the NODIV code; 127 and 32767 are correct for the
nuclear@26 2683 * standard method.
nuclear@26 2684 *
nuclear@26 2685 * [Optimized code by Greg Roelofs and Mark Adler...blame us for bugs. :-) ]
nuclear@26 2686 */
nuclear@26 2687
nuclear@26 2688 /* fg and bg should be in `gamma 1.0' space; alpha is the opacity */
nuclear@26 2689
nuclear@26 2690 # define png_composite(composite, fg, alpha, bg) \
nuclear@26 2691 { png_uint_16 temp = (png_uint_16)((png_uint_16)(fg) * (png_uint_16)(alpha) \
nuclear@26 2692 + (png_uint_16)(bg)*(png_uint_16)(255 - \
nuclear@26 2693 (png_uint_16)(alpha)) + (png_uint_16)128); \
nuclear@26 2694 (composite) = (png_byte)((temp + (temp >> 8)) >> 8); }
nuclear@26 2695
nuclear@26 2696 # define png_composite_16(composite, fg, alpha, bg) \
nuclear@26 2697 { png_uint_32 temp = (png_uint_32)((png_uint_32)(fg) * (png_uint_32)(alpha) \
nuclear@26 2698 + (png_uint_32)(bg)*(png_uint_32)(65535L - \
nuclear@26 2699 (png_uint_32)(alpha)) + (png_uint_32)32768L); \
nuclear@26 2700 (composite) = (png_uint_16)((temp + (temp >> 16)) >> 16); }
nuclear@26 2701
nuclear@26 2702 #else /* standard method using integer division */
nuclear@26 2703
nuclear@26 2704 # define png_composite(composite, fg, alpha, bg) \
nuclear@26 2705 (composite) = (png_byte)(((png_uint_16)(fg) * (png_uint_16)(alpha) + \
nuclear@26 2706 (png_uint_16)(bg) * (png_uint_16)(255 - (png_uint_16)(alpha)) + \
nuclear@26 2707 (png_uint_16)127) / 255)
nuclear@26 2708
nuclear@26 2709 # define png_composite_16(composite, fg, alpha, bg) \
nuclear@26 2710 (composite) = (png_uint_16)(((png_uint_32)(fg) * (png_uint_32)(alpha) + \
nuclear@26 2711 (png_uint_32)(bg)*(png_uint_32)(65535L - (png_uint_32)(alpha)) + \
nuclear@26 2712 (png_uint_32)32767) / (png_uint_32)65535L)
nuclear@26 2713
nuclear@26 2714 #endif /* PNG_READ_COMPOSITE_NODIV_SUPPORTED */
nuclear@26 2715
nuclear@26 2716 /* Inline macros to do direct reads of bytes from the input buffer. These
nuclear@26 2717 * require that you are using an architecture that uses PNG byte ordering
nuclear@26 2718 * (MSB first) and supports unaligned data storage. I think that PowerPC
nuclear@26 2719 * in big-endian mode and 680x0 are the only ones that will support this.
nuclear@26 2720 * The x86 line of processors definitely do not. The png_get_int_32()
nuclear@26 2721 * routine also assumes we are using two's complement format for negative
nuclear@26 2722 * values, which is almost certainly true.
nuclear@26 2723 */
nuclear@26 2724 #if defined(PNG_READ_BIG_ENDIAN_SUPPORTED)
nuclear@26 2725 # define png_get_uint_32(buf) ( *((png_uint_32p) (buf)))
nuclear@26 2726 # define png_get_uint_16(buf) ( *((png_uint_16p) (buf)))
nuclear@26 2727 # define png_get_int_32(buf) ( *((png_int_32p) (buf)))
nuclear@26 2728 #else
nuclear@26 2729 extern PNG_EXPORT(png_uint_32,png_get_uint_32) PNGARG((png_bytep buf));
nuclear@26 2730 extern PNG_EXPORT(png_uint_16,png_get_uint_16) PNGARG((png_bytep buf));
nuclear@26 2731 extern PNG_EXPORT(png_int_32,png_get_int_32) PNGARG((png_bytep buf));
nuclear@26 2732 #endif /* !PNG_READ_BIG_ENDIAN_SUPPORTED */
nuclear@26 2733 extern PNG_EXPORT(png_uint_32,png_get_uint_31)
nuclear@26 2734 PNGARG((png_structp png_ptr, png_bytep buf));
nuclear@26 2735 /* No png_get_int_16 -- may be added if there's a real need for it. */
nuclear@26 2736
nuclear@26 2737 /* Place a 32-bit number into a buffer in PNG byte order (big-endian).
nuclear@26 2738 */
nuclear@26 2739 extern PNG_EXPORT(void,png_save_uint_32)
nuclear@26 2740 PNGARG((png_bytep buf, png_uint_32 i));
nuclear@26 2741 extern PNG_EXPORT(void,png_save_int_32)
nuclear@26 2742 PNGARG((png_bytep buf, png_int_32 i));
nuclear@26 2743
nuclear@26 2744 /* Place a 16-bit number into a buffer in PNG byte order.
nuclear@26 2745 * The parameter is declared unsigned int, not png_uint_16,
nuclear@26 2746 * just to avoid potential problems on pre-ANSI C compilers.
nuclear@26 2747 */
nuclear@26 2748 extern PNG_EXPORT(void,png_save_uint_16)
nuclear@26 2749 PNGARG((png_bytep buf, unsigned int i));
nuclear@26 2750 /* No png_save_int_16 -- may be added if there's a real need for it. */
nuclear@26 2751
nuclear@26 2752 /* ************************************************************************* */
nuclear@26 2753
nuclear@26 2754 /* These next functions are used internally in the code. They generally
nuclear@26 2755 * shouldn't be used unless you are writing code to add or replace some
nuclear@26 2756 * functionality in libpng. More information about most functions can
nuclear@26 2757 * be found in the files where the functions are located.
nuclear@26 2758 */
nuclear@26 2759
nuclear@26 2760
nuclear@26 2761 /* Various modes of operation, that are visible to applications because
nuclear@26 2762 * they are used for unknown chunk location.
nuclear@26 2763 */
nuclear@26 2764 #define PNG_HAVE_IHDR 0x01
nuclear@26 2765 #define PNG_HAVE_PLTE 0x02
nuclear@26 2766 #define PNG_HAVE_IDAT 0x04
nuclear@26 2767 #define PNG_AFTER_IDAT 0x08 /* Have complete zlib datastream */
nuclear@26 2768 #define PNG_HAVE_IEND 0x10
nuclear@26 2769
nuclear@26 2770 #if defined(PNG_INTERNAL)
nuclear@26 2771
nuclear@26 2772 /* More modes of operation. Note that after an init, mode is set to
nuclear@26 2773 * zero automatically when the structure is created.
nuclear@26 2774 */
nuclear@26 2775 #define PNG_HAVE_gAMA 0x20
nuclear@26 2776 #define PNG_HAVE_cHRM 0x40
nuclear@26 2777 #define PNG_HAVE_sRGB 0x80
nuclear@26 2778 #define PNG_HAVE_CHUNK_HEADER 0x100
nuclear@26 2779 #define PNG_WROTE_tIME 0x200
nuclear@26 2780 #define PNG_WROTE_INFO_BEFORE_PLTE 0x400
nuclear@26 2781 #define PNG_BACKGROUND_IS_GRAY 0x800
nuclear@26 2782 #define PNG_HAVE_PNG_SIGNATURE 0x1000
nuclear@26 2783 #define PNG_HAVE_CHUNK_AFTER_IDAT 0x2000 /* Have another chunk after IDAT */
nuclear@26 2784
nuclear@26 2785 /* flags for the transformations the PNG library does on the image data */
nuclear@26 2786 #define PNG_BGR 0x0001
nuclear@26 2787 #define PNG_INTERLACE 0x0002
nuclear@26 2788 #define PNG_PACK 0x0004
nuclear@26 2789 #define PNG_SHIFT 0x0008
nuclear@26 2790 #define PNG_SWAP_BYTES 0x0010
nuclear@26 2791 #define PNG_INVERT_MONO 0x0020
nuclear@26 2792 #define PNG_DITHER 0x0040
nuclear@26 2793 #define PNG_BACKGROUND 0x0080
nuclear@26 2794 #define PNG_BACKGROUND_EXPAND 0x0100
nuclear@26 2795 /* 0x0200 unused */
nuclear@26 2796 #define PNG_16_TO_8 0x0400
nuclear@26 2797 #define PNG_RGBA 0x0800
nuclear@26 2798 #define PNG_EXPAND 0x1000
nuclear@26 2799 #define PNG_GAMMA 0x2000
nuclear@26 2800 #define PNG_GRAY_TO_RGB 0x4000
nuclear@26 2801 #define PNG_FILLER 0x8000L
nuclear@26 2802 #define PNG_PACKSWAP 0x10000L
nuclear@26 2803 #define PNG_SWAP_ALPHA 0x20000L
nuclear@26 2804 #define PNG_STRIP_ALPHA 0x40000L
nuclear@26 2805 #define PNG_INVERT_ALPHA 0x80000L
nuclear@26 2806 #define PNG_USER_TRANSFORM 0x100000L
nuclear@26 2807 #define PNG_RGB_TO_GRAY_ERR 0x200000L
nuclear@26 2808 #define PNG_RGB_TO_GRAY_WARN 0x400000L
nuclear@26 2809 #define PNG_RGB_TO_GRAY 0x600000L /* two bits, RGB_TO_GRAY_ERR|WARN */
nuclear@26 2810 /* 0x800000L Unused */
nuclear@26 2811 #define PNG_ADD_ALPHA 0x1000000L /* Added to libpng-1.2.7 */
nuclear@26 2812 #define PNG_EXPAND_tRNS 0x2000000L /* Added to libpng-1.2.9 */
nuclear@26 2813 /* 0x4000000L unused */
nuclear@26 2814 /* 0x8000000L unused */
nuclear@26 2815 /* 0x10000000L unused */
nuclear@26 2816 /* 0x20000000L unused */
nuclear@26 2817 /* 0x40000000L unused */
nuclear@26 2818
nuclear@26 2819 /* flags for png_create_struct */
nuclear@26 2820 #define PNG_STRUCT_PNG 0x0001
nuclear@26 2821 #define PNG_STRUCT_INFO 0x0002
nuclear@26 2822
nuclear@26 2823 /* Scaling factor for filter heuristic weighting calculations */
nuclear@26 2824 #define PNG_WEIGHT_SHIFT 8
nuclear@26 2825 #define PNG_WEIGHT_FACTOR (1<<(PNG_WEIGHT_SHIFT))
nuclear@26 2826 #define PNG_COST_SHIFT 3
nuclear@26 2827 #define PNG_COST_FACTOR (1<<(PNG_COST_SHIFT))
nuclear@26 2828
nuclear@26 2829 /* flags for the png_ptr->flags rather than declaring a byte for each one */
nuclear@26 2830 #define PNG_FLAG_ZLIB_CUSTOM_STRATEGY 0x0001
nuclear@26 2831 #define PNG_FLAG_ZLIB_CUSTOM_LEVEL 0x0002
nuclear@26 2832 #define PNG_FLAG_ZLIB_CUSTOM_MEM_LEVEL 0x0004
nuclear@26 2833 #define PNG_FLAG_ZLIB_CUSTOM_WINDOW_BITS 0x0008
nuclear@26 2834 #define PNG_FLAG_ZLIB_CUSTOM_METHOD 0x0010
nuclear@26 2835 #define PNG_FLAG_ZLIB_FINISHED 0x0020
nuclear@26 2836 #define PNG_FLAG_ROW_INIT 0x0040
nuclear@26 2837 #define PNG_FLAG_FILLER_AFTER 0x0080
nuclear@26 2838 #define PNG_FLAG_CRC_ANCILLARY_USE 0x0100
nuclear@26 2839 #define PNG_FLAG_CRC_ANCILLARY_NOWARN 0x0200
nuclear@26 2840 #define PNG_FLAG_CRC_CRITICAL_USE 0x0400
nuclear@26 2841 #define PNG_FLAG_CRC_CRITICAL_IGNORE 0x0800
nuclear@26 2842 #define PNG_FLAG_FREE_PLTE 0x1000
nuclear@26 2843 #define PNG_FLAG_FREE_TRNS 0x2000
nuclear@26 2844 #define PNG_FLAG_FREE_HIST 0x4000
nuclear@26 2845 #define PNG_FLAG_KEEP_UNKNOWN_CHUNKS 0x8000L
nuclear@26 2846 #define PNG_FLAG_KEEP_UNSAFE_CHUNKS 0x10000L
nuclear@26 2847 #define PNG_FLAG_LIBRARY_MISMATCH 0x20000L
nuclear@26 2848 #define PNG_FLAG_STRIP_ERROR_NUMBERS 0x40000L
nuclear@26 2849 #define PNG_FLAG_STRIP_ERROR_TEXT 0x80000L
nuclear@26 2850 #define PNG_FLAG_MALLOC_NULL_MEM_OK 0x100000L
nuclear@26 2851 #define PNG_FLAG_ADD_ALPHA 0x200000L /* Added to libpng-1.2.8 */
nuclear@26 2852 #define PNG_FLAG_STRIP_ALPHA 0x400000L /* Added to libpng-1.2.8 */
nuclear@26 2853 /* 0x800000L unused */
nuclear@26 2854 /* 0x1000000L unused */
nuclear@26 2855 /* 0x2000000L unused */
nuclear@26 2856 /* 0x4000000L unused */
nuclear@26 2857 /* 0x8000000L unused */
nuclear@26 2858 /* 0x10000000L unused */
nuclear@26 2859 /* 0x20000000L unused */
nuclear@26 2860 /* 0x40000000L unused */
nuclear@26 2861
nuclear@26 2862 #define PNG_FLAG_CRC_ANCILLARY_MASK (PNG_FLAG_CRC_ANCILLARY_USE | \
nuclear@26 2863 PNG_FLAG_CRC_ANCILLARY_NOWARN)
nuclear@26 2864
nuclear@26 2865 #define PNG_FLAG_CRC_CRITICAL_MASK (PNG_FLAG_CRC_CRITICAL_USE | \
nuclear@26 2866 PNG_FLAG_CRC_CRITICAL_IGNORE)
nuclear@26 2867
nuclear@26 2868 #define PNG_FLAG_CRC_MASK (PNG_FLAG_CRC_ANCILLARY_MASK | \
nuclear@26 2869 PNG_FLAG_CRC_CRITICAL_MASK)
nuclear@26 2870
nuclear@26 2871 /* save typing and make code easier to understand */
nuclear@26 2872
nuclear@26 2873 #define PNG_COLOR_DIST(c1, c2) (abs((int)((c1).red) - (int)((c2).red)) + \
nuclear@26 2874 abs((int)((c1).green) - (int)((c2).green)) + \
nuclear@26 2875 abs((int)((c1).blue) - (int)((c2).blue)))
nuclear@26 2876
nuclear@26 2877 /* Added to libpng-1.2.6 JB */
nuclear@26 2878 #define PNG_ROWBYTES(pixel_bits, width) \
nuclear@26 2879 ((pixel_bits) >= 8 ? \
nuclear@26 2880 ((width) * (((png_uint_32)(pixel_bits)) >> 3)) : \
nuclear@26 2881 (( ((width) * ((png_uint_32)(pixel_bits))) + 7) >> 3) )
nuclear@26 2882
nuclear@26 2883 /* PNG_OUT_OF_RANGE returns true if value is outside the range
nuclear@26 2884 ideal-delta..ideal+delta. Each argument is evaluated twice.
nuclear@26 2885 "ideal" and "delta" should be constants, normally simple
nuclear@26 2886 integers, "value" a variable. Added to libpng-1.2.6 JB */
nuclear@26 2887 #define PNG_OUT_OF_RANGE(value, ideal, delta) \
nuclear@26 2888 ( (value) < (ideal)-(delta) || (value) > (ideal)+(delta) )
nuclear@26 2889
nuclear@26 2890 /* variables declared in png.c - only it needs to define PNG_NO_EXTERN */
nuclear@26 2891 #if !defined(PNG_NO_EXTERN) || defined(PNG_ALWAYS_EXTERN)
nuclear@26 2892 /* place to hold the signature string for a PNG file. */
nuclear@26 2893 #ifdef PNG_USE_GLOBAL_ARRAYS
nuclear@26 2894 PNG_EXPORT_VAR (PNG_CONST png_byte FARDATA) png_sig[8];
nuclear@26 2895 #else
nuclear@26 2896 #endif
nuclear@26 2897 #endif /* PNG_NO_EXTERN */
nuclear@26 2898
nuclear@26 2899 /* Constant strings for known chunk types. If you need to add a chunk,
nuclear@26 2900 * define the name here, and add an invocation of the macro in png.c and
nuclear@26 2901 * wherever it's needed.
nuclear@26 2902 */
nuclear@26 2903 #define PNG_IHDR png_byte png_IHDR[5] = { 73, 72, 68, 82, '\0'}
nuclear@26 2904 #define PNG_IDAT png_byte png_IDAT[5] = { 73, 68, 65, 84, '\0'}
nuclear@26 2905 #define PNG_IEND png_byte png_IEND[5] = { 73, 69, 78, 68, '\0'}
nuclear@26 2906 #define PNG_PLTE png_byte png_PLTE[5] = { 80, 76, 84, 69, '\0'}
nuclear@26 2907 #define PNG_bKGD png_byte png_bKGD[5] = { 98, 75, 71, 68, '\0'}
nuclear@26 2908 #define PNG_cHRM png_byte png_cHRM[5] = { 99, 72, 82, 77, '\0'}
nuclear@26 2909 #define PNG_gAMA png_byte png_gAMA[5] = {103, 65, 77, 65, '\0'}
nuclear@26 2910 #define PNG_hIST png_byte png_hIST[5] = {104, 73, 83, 84, '\0'}
nuclear@26 2911 #define PNG_iCCP png_byte png_iCCP[5] = {105, 67, 67, 80, '\0'}
nuclear@26 2912 #define PNG_iTXt png_byte png_iTXt[5] = {105, 84, 88, 116, '\0'}
nuclear@26 2913 #define PNG_oFFs png_byte png_oFFs[5] = {111, 70, 70, 115, '\0'}
nuclear@26 2914 #define PNG_pCAL png_byte png_pCAL[5] = {112, 67, 65, 76, '\0'}
nuclear@26 2915 #define PNG_sCAL png_byte png_sCAL[5] = {115, 67, 65, 76, '\0'}
nuclear@26 2916 #define PNG_pHYs png_byte png_pHYs[5] = {112, 72, 89, 115, '\0'}
nuclear@26 2917 #define PNG_sBIT png_byte png_sBIT[5] = {115, 66, 73, 84, '\0'}
nuclear@26 2918 #define PNG_sPLT png_byte png_sPLT[5] = {115, 80, 76, 84, '\0'}
nuclear@26 2919 #define PNG_sRGB png_byte png_sRGB[5] = {115, 82, 71, 66, '\0'}
nuclear@26 2920 #define PNG_tEXt png_byte png_tEXt[5] = {116, 69, 88, 116, '\0'}
nuclear@26 2921 #define PNG_tIME png_byte png_tIME[5] = {116, 73, 77, 69, '\0'}
nuclear@26 2922 #define PNG_tRNS png_byte png_tRNS[5] = {116, 82, 78, 83, '\0'}
nuclear@26 2923 #define PNG_zTXt png_byte png_zTXt[5] = {122, 84, 88, 116, '\0'}
nuclear@26 2924
nuclear@26 2925 #ifdef PNG_USE_GLOBAL_ARRAYS
nuclear@26 2926 PNG_EXPORT_VAR (png_byte FARDATA) png_IHDR[5];
nuclear@26 2927 PNG_EXPORT_VAR (png_byte FARDATA) png_IDAT[5];
nuclear@26 2928 PNG_EXPORT_VAR (png_byte FARDATA) png_IEND[5];
nuclear@26 2929 PNG_EXPORT_VAR (png_byte FARDATA) png_PLTE[5];
nuclear@26 2930 PNG_EXPORT_VAR (png_byte FARDATA) png_bKGD[5];
nuclear@26 2931 PNG_EXPORT_VAR (png_byte FARDATA) png_cHRM[5];
nuclear@26 2932 PNG_EXPORT_VAR (png_byte FARDATA) png_gAMA[5];
nuclear@26 2933 PNG_EXPORT_VAR (png_byte FARDATA) png_hIST[5];
nuclear@26 2934 PNG_EXPORT_VAR (png_byte FARDATA) png_iCCP[5];
nuclear@26 2935 PNG_EXPORT_VAR (png_byte FARDATA) png_iTXt[5];
nuclear@26 2936 PNG_EXPORT_VAR (png_byte FARDATA) png_oFFs[5];
nuclear@26 2937 PNG_EXPORT_VAR (png_byte FARDATA) png_pCAL[5];
nuclear@26 2938 PNG_EXPORT_VAR (png_byte FARDATA) png_sCAL[5];
nuclear@26 2939 PNG_EXPORT_VAR (png_byte FARDATA) png_pHYs[5];
nuclear@26 2940 PNG_EXPORT_VAR (png_byte FARDATA) png_sBIT[5];
nuclear@26 2941 PNG_EXPORT_VAR (png_byte FARDATA) png_sPLT[5];
nuclear@26 2942 PNG_EXPORT_VAR (png_byte FARDATA) png_sRGB[5];
nuclear@26 2943 PNG_EXPORT_VAR (png_byte FARDATA) png_tEXt[5];
nuclear@26 2944 PNG_EXPORT_VAR (png_byte FARDATA) png_tIME[5];
nuclear@26 2945 PNG_EXPORT_VAR (png_byte FARDATA) png_tRNS[5];
nuclear@26 2946 PNG_EXPORT_VAR (png_byte FARDATA) png_zTXt[5];
nuclear@26 2947 #endif /* PNG_USE_GLOBAL_ARRAYS */
nuclear@26 2948
nuclear@26 2949 #if defined(PNG_1_0_X) || defined (PNG_1_2_X)
nuclear@26 2950 /* Initialize png_ptr struct for reading, and allocate any other memory.
nuclear@26 2951 * (old interface - DEPRECATED - use png_create_read_struct instead).
nuclear@26 2952 */
nuclear@26 2953 extern PNG_EXPORT(void,png_read_init) PNGARG((png_structp png_ptr));
nuclear@26 2954 #undef png_read_init
nuclear@26 2955 #define png_read_init(png_ptr) png_read_init_3(&png_ptr, \
nuclear@26 2956 PNG_LIBPNG_VER_STRING, png_sizeof(png_struct));
nuclear@26 2957 #endif
nuclear@26 2958
nuclear@26 2959 extern PNG_EXPORT(void,png_read_init_3) PNGARG((png_structpp ptr_ptr,
nuclear@26 2960 png_const_charp user_png_ver, png_size_t png_struct_size));
nuclear@26 2961 #if defined(PNG_1_0_X) || defined (PNG_1_2_X)
nuclear@26 2962 extern PNG_EXPORT(void,png_read_init_2) PNGARG((png_structp png_ptr,
nuclear@26 2963 png_const_charp user_png_ver, png_size_t png_struct_size, png_size_t
nuclear@26 2964 png_info_size));
nuclear@26 2965 #endif
nuclear@26 2966
nuclear@26 2967 #if defined(PNG_1_0_X) || defined (PNG_1_2_X)
nuclear@26 2968 /* Initialize png_ptr struct for writing, and allocate any other memory.
nuclear@26 2969 * (old interface - DEPRECATED - use png_create_write_struct instead).
nuclear@26 2970 */
nuclear@26 2971 extern PNG_EXPORT(void,png_write_init) PNGARG((png_structp png_ptr));
nuclear@26 2972 #undef png_write_init
nuclear@26 2973 #define png_write_init(png_ptr) png_write_init_3(&png_ptr, \
nuclear@26 2974 PNG_LIBPNG_VER_STRING, png_sizeof(png_struct));
nuclear@26 2975 #endif
nuclear@26 2976
nuclear@26 2977 extern PNG_EXPORT(void,png_write_init_3) PNGARG((png_structpp ptr_ptr,
nuclear@26 2978 png_const_charp user_png_ver, png_size_t png_struct_size));
nuclear@26 2979 extern PNG_EXPORT(void,png_write_init_2) PNGARG((png_structp png_ptr,
nuclear@26 2980 png_const_charp user_png_ver, png_size_t png_struct_size, png_size_t
nuclear@26 2981 png_info_size));
nuclear@26 2982
nuclear@26 2983 /* Allocate memory for an internal libpng struct */
nuclear@26 2984 PNG_EXTERN png_voidp png_create_struct PNGARG((int type));
nuclear@26 2985
nuclear@26 2986 /* Free memory from internal libpng struct */
nuclear@26 2987 PNG_EXTERN void png_destroy_struct PNGARG((png_voidp struct_ptr));
nuclear@26 2988
nuclear@26 2989 PNG_EXTERN png_voidp png_create_struct_2 PNGARG((int type, png_malloc_ptr
nuclear@26 2990 malloc_fn, png_voidp mem_ptr));
nuclear@26 2991 PNG_EXTERN void png_destroy_struct_2 PNGARG((png_voidp struct_ptr,
nuclear@26 2992 png_free_ptr free_fn, png_voidp mem_ptr));
nuclear@26 2993
nuclear@26 2994 /* Free any memory that info_ptr points to and reset struct. */
nuclear@26 2995 PNG_EXTERN void png_info_destroy PNGARG((png_structp png_ptr,
nuclear@26 2996 png_infop info_ptr));
nuclear@26 2997
nuclear@26 2998 #ifndef PNG_1_0_X
nuclear@26 2999 /* Function to allocate memory for zlib. */
nuclear@26 3000 PNG_EXTERN voidpf png_zalloc PNGARG((voidpf png_ptr, uInt items, uInt size));
nuclear@26 3001
nuclear@26 3002 /* Function to free memory for zlib */
nuclear@26 3003 PNG_EXTERN void png_zfree PNGARG((voidpf png_ptr, voidpf ptr));
nuclear@26 3004
nuclear@26 3005 #ifdef PNG_SIZE_T
nuclear@26 3006 /* Function to convert a sizeof an item to png_sizeof item */
nuclear@26 3007 PNG_EXTERN png_size_t PNGAPI png_convert_size PNGARG((size_t size));
nuclear@26 3008 #endif
nuclear@26 3009
nuclear@26 3010 /* Next four functions are used internally as callbacks. PNGAPI is required
nuclear@26 3011 * but not PNG_EXPORT. PNGAPI added at libpng version 1.2.3. */
nuclear@26 3012
nuclear@26 3013 PNG_EXTERN void PNGAPI png_default_read_data PNGARG((png_structp png_ptr,
nuclear@26 3014 png_bytep data, png_size_t length));
nuclear@26 3015
nuclear@26 3016 #ifdef PNG_PROGRESSIVE_READ_SUPPORTED
nuclear@26 3017 PNG_EXTERN void PNGAPI png_push_fill_buffer PNGARG((png_structp png_ptr,
nuclear@26 3018 png_bytep buffer, png_size_t length));
nuclear@26 3019 #endif
nuclear@26 3020
nuclear@26 3021 PNG_EXTERN void PNGAPI png_default_write_data PNGARG((png_structp png_ptr,
nuclear@26 3022 png_bytep data, png_size_t length));
nuclear@26 3023
nuclear@26 3024 #if defined(PNG_WRITE_FLUSH_SUPPORTED)
nuclear@26 3025 #if !defined(PNG_NO_STDIO)
nuclear@26 3026 PNG_EXTERN void PNGAPI png_default_flush PNGARG((png_structp png_ptr));
nuclear@26 3027 #endif
nuclear@26 3028 #endif
nuclear@26 3029 #else /* PNG_1_0_X */
nuclear@26 3030 #ifdef PNG_PROGRESSIVE_READ_SUPPORTED
nuclear@26 3031 PNG_EXTERN void png_push_fill_buffer PNGARG((png_structp png_ptr,
nuclear@26 3032 png_bytep buffer, png_size_t length));
nuclear@26 3033 #endif
nuclear@26 3034 #endif /* PNG_1_0_X */
nuclear@26 3035
nuclear@26 3036 /* Reset the CRC variable */
nuclear@26 3037 PNG_EXTERN void png_reset_crc PNGARG((png_structp png_ptr));
nuclear@26 3038
nuclear@26 3039 /* Write the "data" buffer to whatever output you are using. */
nuclear@26 3040 PNG_EXTERN void png_write_data PNGARG((png_structp png_ptr, png_bytep data,
nuclear@26 3041 png_size_t length));
nuclear@26 3042
nuclear@26 3043 /* Read data from whatever input you are using into the "data" buffer */
nuclear@26 3044 PNG_EXTERN void png_read_data PNGARG((png_structp png_ptr, png_bytep data,
nuclear@26 3045 png_size_t length));
nuclear@26 3046
nuclear@26 3047 /* Read bytes into buf, and update png_ptr->crc */
nuclear@26 3048 PNG_EXTERN void png_crc_read PNGARG((png_structp png_ptr, png_bytep buf,
nuclear@26 3049 png_size_t length));
nuclear@26 3050
nuclear@26 3051 /* Decompress data in a chunk that uses compression */
nuclear@26 3052 #if defined(PNG_zTXt_SUPPORTED) || defined(PNG_iTXt_SUPPORTED) || \
nuclear@26 3053 defined(PNG_iCCP_SUPPORTED) || defined(PNG_sPLT_SUPPORTED)
nuclear@26 3054 PNG_EXTERN void png_decompress_chunk PNGARG((png_structp png_ptr,
nuclear@26 3055 int comp_type, png_size_t chunklength,
nuclear@26 3056 png_size_t prefix_length, png_size_t *data_length));
nuclear@26 3057 #endif
nuclear@26 3058
nuclear@26 3059 /* Read "skip" bytes, read the file crc, and (optionally) verify png_ptr->crc */
nuclear@26 3060 PNG_EXTERN int png_crc_finish PNGARG((png_structp png_ptr, png_uint_32 skip));
nuclear@26 3061
nuclear@26 3062 /* Read the CRC from the file and compare it to the libpng calculated CRC */
nuclear@26 3063 PNG_EXTERN int png_crc_error PNGARG((png_structp png_ptr));
nuclear@26 3064
nuclear@26 3065 /* Calculate the CRC over a section of data. Note that we are only
nuclear@26 3066 * passing a maximum of 64K on systems that have this as a memory limit,
nuclear@26 3067 * since this is the maximum buffer size we can specify.
nuclear@26 3068 */
nuclear@26 3069 PNG_EXTERN void png_calculate_crc PNGARG((png_structp png_ptr, png_bytep ptr,
nuclear@26 3070 png_size_t length));
nuclear@26 3071
nuclear@26 3072 #if defined(PNG_WRITE_FLUSH_SUPPORTED)
nuclear@26 3073 PNG_EXTERN void png_flush PNGARG((png_structp png_ptr));
nuclear@26 3074 #endif
nuclear@26 3075
nuclear@26 3076 /* simple function to write the signature */
nuclear@26 3077 PNG_EXTERN void png_write_sig PNGARG((png_structp png_ptr));
nuclear@26 3078
nuclear@26 3079 /* write various chunks */
nuclear@26 3080
nuclear@26 3081 /* Write the IHDR chunk, and update the png_struct with the necessary
nuclear@26 3082 * information.
nuclear@26 3083 */
nuclear@26 3084 PNG_EXTERN void png_write_IHDR PNGARG((png_structp png_ptr, png_uint_32 width,
nuclear@26 3085 png_uint_32 height,
nuclear@26 3086 int bit_depth, int color_type, int compression_method, int filter_method,
nuclear@26 3087 int interlace_method));
nuclear@26 3088
nuclear@26 3089 PNG_EXTERN void png_write_PLTE PNGARG((png_structp png_ptr, png_colorp palette,
nuclear@26 3090 png_uint_32 num_pal));
nuclear@26 3091
nuclear@26 3092 PNG_EXTERN void png_write_IDAT PNGARG((png_structp png_ptr, png_bytep data,
nuclear@26 3093 png_size_t length));
nuclear@26 3094
nuclear@26 3095 PNG_EXTERN void png_write_IEND PNGARG((png_structp png_ptr));
nuclear@26 3096
nuclear@26 3097 #if defined(PNG_WRITE_gAMA_SUPPORTED)
nuclear@26 3098 #ifdef PNG_FLOATING_POINT_SUPPORTED
nuclear@26 3099 PNG_EXTERN void png_write_gAMA PNGARG((png_structp png_ptr, double file_gamma));
nuclear@26 3100 #endif
nuclear@26 3101 #ifdef PNG_FIXED_POINT_SUPPORTED
nuclear@26 3102 PNG_EXTERN void png_write_gAMA_fixed PNGARG((png_structp png_ptr, png_fixed_point
nuclear@26 3103 file_gamma));
nuclear@26 3104 #endif
nuclear@26 3105 #endif
nuclear@26 3106
nuclear@26 3107 #if defined(PNG_WRITE_sBIT_SUPPORTED)
nuclear@26 3108 PNG_EXTERN void png_write_sBIT PNGARG((png_structp png_ptr, png_color_8p sbit,
nuclear@26 3109 int color_type));
nuclear@26 3110 #endif
nuclear@26 3111
nuclear@26 3112 #if defined(PNG_WRITE_cHRM_SUPPORTED)
nuclear@26 3113 #ifdef PNG_FLOATING_POINT_SUPPORTED
nuclear@26 3114 PNG_EXTERN void png_write_cHRM PNGARG((png_structp png_ptr,
nuclear@26 3115 double white_x, double white_y,
nuclear@26 3116 double red_x, double red_y, double green_x, double green_y,
nuclear@26 3117 double blue_x, double blue_y));
nuclear@26 3118 #endif
nuclear@26 3119 #ifdef PNG_FIXED_POINT_SUPPORTED
nuclear@26 3120 PNG_EXTERN void png_write_cHRM_fixed PNGARG((png_structp png_ptr,
nuclear@26 3121 png_fixed_point int_white_x, png_fixed_point int_white_y,
nuclear@26 3122 png_fixed_point int_red_x, png_fixed_point int_red_y, png_fixed_point
nuclear@26 3123 int_green_x, png_fixed_point int_green_y, png_fixed_point int_blue_x,
nuclear@26 3124 png_fixed_point int_blue_y));
nuclear@26 3125 #endif
nuclear@26 3126 #endif
nuclear@26 3127
nuclear@26 3128 #if defined(PNG_WRITE_sRGB_SUPPORTED)
nuclear@26 3129 PNG_EXTERN void png_write_sRGB PNGARG((png_structp png_ptr,
nuclear@26 3130 int intent));
nuclear@26 3131 #endif
nuclear@26 3132
nuclear@26 3133 #if defined(PNG_WRITE_iCCP_SUPPORTED)
nuclear@26 3134 PNG_EXTERN void png_write_iCCP PNGARG((png_structp png_ptr,
nuclear@26 3135 png_charp name, int compression_type,
nuclear@26 3136 png_charp profile, int proflen));
nuclear@26 3137 /* Note to maintainer: profile should be png_bytep */
nuclear@26 3138 #endif
nuclear@26 3139
nuclear@26 3140 #if defined(PNG_WRITE_sPLT_SUPPORTED)
nuclear@26 3141 PNG_EXTERN void png_write_sPLT PNGARG((png_structp png_ptr,
nuclear@26 3142 png_sPLT_tp palette));
nuclear@26 3143 #endif
nuclear@26 3144
nuclear@26 3145 #if defined(PNG_WRITE_tRNS_SUPPORTED)
nuclear@26 3146 PNG_EXTERN void png_write_tRNS PNGARG((png_structp png_ptr, png_bytep trans,
nuclear@26 3147 png_color_16p values, int number, int color_type));
nuclear@26 3148 #endif
nuclear@26 3149
nuclear@26 3150 #if defined(PNG_WRITE_bKGD_SUPPORTED)
nuclear@26 3151 PNG_EXTERN void png_write_bKGD PNGARG((png_structp png_ptr,
nuclear@26 3152 png_color_16p values, int color_type));
nuclear@26 3153 #endif
nuclear@26 3154
nuclear@26 3155 #if defined(PNG_WRITE_hIST_SUPPORTED)
nuclear@26 3156 PNG_EXTERN void png_write_hIST PNGARG((png_structp png_ptr, png_uint_16p hist,
nuclear@26 3157 int num_hist));
nuclear@26 3158 #endif
nuclear@26 3159
nuclear@26 3160 #if defined(PNG_WRITE_TEXT_SUPPORTED) || defined(PNG_WRITE_pCAL_SUPPORTED) || \
nuclear@26 3161 defined(PNG_WRITE_iCCP_SUPPORTED) || defined(PNG_WRITE_sPLT_SUPPORTED)
nuclear@26 3162 PNG_EXTERN png_size_t png_check_keyword PNGARG((png_structp png_ptr,
nuclear@26 3163 png_charp key, png_charpp new_key));
nuclear@26 3164 #endif
nuclear@26 3165
nuclear@26 3166 #if defined(PNG_WRITE_tEXt_SUPPORTED)
nuclear@26 3167 PNG_EXTERN void png_write_tEXt PNGARG((png_structp png_ptr, png_charp key,
nuclear@26 3168 png_charp text, png_size_t text_len));
nuclear@26 3169 #endif
nuclear@26 3170
nuclear@26 3171 #if defined(PNG_WRITE_zTXt_SUPPORTED)
nuclear@26 3172 PNG_EXTERN void png_write_zTXt PNGARG((png_structp png_ptr, png_charp key,
nuclear@26 3173 png_charp text, png_size_t text_len, int compression));
nuclear@26 3174 #endif
nuclear@26 3175
nuclear@26 3176 #if defined(PNG_WRITE_iTXt_SUPPORTED)
nuclear@26 3177 PNG_EXTERN void png_write_iTXt PNGARG((png_structp png_ptr,
nuclear@26 3178 int compression, png_charp key, png_charp lang, png_charp lang_key,
nuclear@26 3179 png_charp text));
nuclear@26 3180 #endif
nuclear@26 3181
nuclear@26 3182 #if defined(PNG_TEXT_SUPPORTED) /* Added at version 1.0.14 and 1.2.4 */
nuclear@26 3183 PNG_EXTERN int png_set_text_2 PNGARG((png_structp png_ptr,
nuclear@26 3184 png_infop info_ptr, png_textp text_ptr, int num_text));
nuclear@26 3185 #endif
nuclear@26 3186
nuclear@26 3187 #if defined(PNG_WRITE_oFFs_SUPPORTED)
nuclear@26 3188 PNG_EXTERN void png_write_oFFs PNGARG((png_structp png_ptr,
nuclear@26 3189 png_int_32 x_offset, png_int_32 y_offset, int unit_type));
nuclear@26 3190 #endif
nuclear@26 3191
nuclear@26 3192 #if defined(PNG_WRITE_pCAL_SUPPORTED)
nuclear@26 3193 PNG_EXTERN void png_write_pCAL PNGARG((png_structp png_ptr, png_charp purpose,
nuclear@26 3194 png_int_32 X0, png_int_32 X1, int type, int nparams,
nuclear@26 3195 png_charp units, png_charpp params));
nuclear@26 3196 #endif
nuclear@26 3197
nuclear@26 3198 #if defined(PNG_WRITE_pHYs_SUPPORTED)
nuclear@26 3199 PNG_EXTERN void png_write_pHYs PNGARG((png_structp png_ptr,
nuclear@26 3200 png_uint_32 x_pixels_per_unit, png_uint_32 y_pixels_per_unit,
nuclear@26 3201 int unit_type));
nuclear@26 3202 #endif
nuclear@26 3203
nuclear@26 3204 #if defined(PNG_WRITE_tIME_SUPPORTED)
nuclear@26 3205 PNG_EXTERN void png_write_tIME PNGARG((png_structp png_ptr,
nuclear@26 3206 png_timep mod_time));
nuclear@26 3207 #endif
nuclear@26 3208
nuclear@26 3209 #if defined(PNG_WRITE_sCAL_SUPPORTED)
nuclear@26 3210 #if defined(PNG_FLOATING_POINT_SUPPORTED) && !defined(PNG_NO_STDIO)
nuclear@26 3211 PNG_EXTERN void png_write_sCAL PNGARG((png_structp png_ptr,
nuclear@26 3212 int unit, double width, double height));
nuclear@26 3213 #else
nuclear@26 3214 #ifdef PNG_FIXED_POINT_SUPPORTED
nuclear@26 3215 PNG_EXTERN void png_write_sCAL_s PNGARG((png_structp png_ptr,
nuclear@26 3216 int unit, png_charp width, png_charp height));
nuclear@26 3217 #endif
nuclear@26 3218 #endif
nuclear@26 3219 #endif
nuclear@26 3220
nuclear@26 3221 /* Called when finished processing a row of data */
nuclear@26 3222 PNG_EXTERN void png_write_finish_row PNGARG((png_structp png_ptr));
nuclear@26 3223
nuclear@26 3224 /* Internal use only. Called before first row of data */
nuclear@26 3225 PNG_EXTERN void png_write_start_row PNGARG((png_structp png_ptr));
nuclear@26 3226
nuclear@26 3227 #if defined(PNG_READ_GAMMA_SUPPORTED)
nuclear@26 3228 PNG_EXTERN void png_build_gamma_table PNGARG((png_structp png_ptr));
nuclear@26 3229 #endif
nuclear@26 3230
nuclear@26 3231 /* combine a row of data, dealing with alpha, etc. if requested */
nuclear@26 3232 PNG_EXTERN void png_combine_row PNGARG((png_structp png_ptr, png_bytep row,
nuclear@26 3233 int mask));
nuclear@26 3234
nuclear@26 3235 #if defined(PNG_READ_INTERLACING_SUPPORTED)
nuclear@26 3236 /* expand an interlaced row */
nuclear@26 3237 /* OLD pre-1.0.9 interface:
nuclear@26 3238 PNG_EXTERN void png_do_read_interlace PNGARG((png_row_infop row_info,
nuclear@26 3239 png_bytep row, int pass, png_uint_32 transformations));
nuclear@26 3240 */
nuclear@26 3241 PNG_EXTERN void png_do_read_interlace PNGARG((png_structp png_ptr));
nuclear@26 3242 #endif
nuclear@26 3243
nuclear@26 3244 /* GRR TO DO (2.0 or whenever): simplify other internal calling interfaces */
nuclear@26 3245
nuclear@26 3246 #if defined(PNG_WRITE_INTERLACING_SUPPORTED)
nuclear@26 3247 /* grab pixels out of a row for an interlaced pass */
nuclear@26 3248 PNG_EXTERN void png_do_write_interlace PNGARG((png_row_infop row_info,
nuclear@26 3249 png_bytep row, int pass));
nuclear@26 3250 #endif
nuclear@26 3251
nuclear@26 3252 /* unfilter a row */
nuclear@26 3253 PNG_EXTERN void png_read_filter_row PNGARG((png_structp png_ptr,
nuclear@26 3254 png_row_infop row_info, png_bytep row, png_bytep prev_row, int filter));
nuclear@26 3255
nuclear@26 3256 /* Choose the best filter to use and filter the row data */
nuclear@26 3257 PNG_EXTERN void png_write_find_filter PNGARG((png_structp png_ptr,
nuclear@26 3258 png_row_infop row_info));
nuclear@26 3259
nuclear@26 3260 /* Write out the filtered row. */
nuclear@26 3261 PNG_EXTERN void png_write_filtered_row PNGARG((png_structp png_ptr,
nuclear@26 3262 png_bytep filtered_row));
nuclear@26 3263 /* finish a row while reading, dealing with interlacing passes, etc. */
nuclear@26 3264 PNG_EXTERN void png_read_finish_row PNGARG((png_structp png_ptr));
nuclear@26 3265
nuclear@26 3266 /* initialize the row buffers, etc. */
nuclear@26 3267 PNG_EXTERN void png_read_start_row PNGARG((png_structp png_ptr));
nuclear@26 3268 /* optional call to update the users info structure */
nuclear@26 3269 PNG_EXTERN void png_read_transform_info PNGARG((png_structp png_ptr,
nuclear@26 3270 png_infop info_ptr));
nuclear@26 3271
nuclear@26 3272 /* these are the functions that do the transformations */
nuclear@26 3273 #if defined(PNG_READ_FILLER_SUPPORTED)
nuclear@26 3274 PNG_EXTERN void png_do_read_filler PNGARG((png_row_infop row_info,
nuclear@26 3275 png_bytep row, png_uint_32 filler, png_uint_32 flags));
nuclear@26 3276 #endif
nuclear@26 3277
nuclear@26 3278 #if defined(PNG_READ_SWAP_ALPHA_SUPPORTED)
nuclear@26 3279 PNG_EXTERN void png_do_read_swap_alpha PNGARG((png_row_infop row_info,
nuclear@26 3280 png_bytep row));
nuclear@26 3281 #endif
nuclear@26 3282
nuclear@26 3283 #if defined(PNG_WRITE_SWAP_ALPHA_SUPPORTED)
nuclear@26 3284 PNG_EXTERN void png_do_write_swap_alpha PNGARG((png_row_infop row_info,
nuclear@26 3285 png_bytep row));
nuclear@26 3286 #endif
nuclear@26 3287
nuclear@26 3288 #if defined(PNG_READ_INVERT_ALPHA_SUPPORTED)
nuclear@26 3289 PNG_EXTERN void png_do_read_invert_alpha PNGARG((png_row_infop row_info,
nuclear@26 3290 png_bytep row));
nuclear@26 3291 #endif
nuclear@26 3292
nuclear@26 3293 #if defined(PNG_WRITE_INVERT_ALPHA_SUPPORTED)
nuclear@26 3294 PNG_EXTERN void png_do_write_invert_alpha PNGARG((png_row_infop row_info,
nuclear@26 3295 png_bytep row));
nuclear@26 3296 #endif
nuclear@26 3297
nuclear@26 3298 #if defined(PNG_WRITE_FILLER_SUPPORTED) || \
nuclear@26 3299 defined(PNG_READ_STRIP_ALPHA_SUPPORTED)
nuclear@26 3300 PNG_EXTERN void png_do_strip_filler PNGARG((png_row_infop row_info,
nuclear@26 3301 png_bytep row, png_uint_32 flags));
nuclear@26 3302 #endif
nuclear@26 3303
nuclear@26 3304 #if defined(PNG_READ_SWAP_SUPPORTED) || defined(PNG_WRITE_SWAP_SUPPORTED)
nuclear@26 3305 PNG_EXTERN void png_do_swap PNGARG((png_row_infop row_info, png_bytep row));
nuclear@26 3306 #endif
nuclear@26 3307
nuclear@26 3308 #if defined(PNG_READ_PACKSWAP_SUPPORTED) || defined(PNG_WRITE_PACKSWAP_SUPPORTED)
nuclear@26 3309 PNG_EXTERN void png_do_packswap PNGARG((png_row_infop row_info, png_bytep row));
nuclear@26 3310 #endif
nuclear@26 3311
nuclear@26 3312 #if defined(PNG_READ_RGB_TO_GRAY_SUPPORTED)
nuclear@26 3313 PNG_EXTERN int png_do_rgb_to_gray PNGARG((png_structp png_ptr, png_row_infop
nuclear@26 3314 row_info, png_bytep row));
nuclear@26 3315 #endif
nuclear@26 3316
nuclear@26 3317 #if defined(PNG_READ_GRAY_TO_RGB_SUPPORTED)
nuclear@26 3318 PNG_EXTERN void png_do_gray_to_rgb PNGARG((png_row_infop row_info,
nuclear@26 3319 png_bytep row));
nuclear@26 3320 #endif
nuclear@26 3321
nuclear@26 3322 #if defined(PNG_READ_PACK_SUPPORTED)
nuclear@26 3323 PNG_EXTERN void png_do_unpack PNGARG((png_row_infop row_info, png_bytep row));
nuclear@26 3324 #endif
nuclear@26 3325
nuclear@26 3326 #if defined(PNG_READ_SHIFT_SUPPORTED)
nuclear@26 3327 PNG_EXTERN void png_do_unshift PNGARG((png_row_infop row_info, png_bytep row,
nuclear@26 3328 png_color_8p sig_bits));
nuclear@26 3329 #endif
nuclear@26 3330
nuclear@26 3331 #if defined(PNG_READ_INVERT_SUPPORTED) || defined(PNG_WRITE_INVERT_SUPPORTED)
nuclear@26 3332 PNG_EXTERN void png_do_invert PNGARG((png_row_infop row_info, png_bytep row));
nuclear@26 3333 #endif
nuclear@26 3334
nuclear@26 3335 #if defined(PNG_READ_16_TO_8_SUPPORTED)
nuclear@26 3336 PNG_EXTERN void png_do_chop PNGARG((png_row_infop row_info, png_bytep row));
nuclear@26 3337 #endif
nuclear@26 3338
nuclear@26 3339 #if defined(PNG_READ_DITHER_SUPPORTED)
nuclear@26 3340 PNG_EXTERN void png_do_dither PNGARG((png_row_infop row_info,
nuclear@26 3341 png_bytep row, png_bytep palette_lookup, png_bytep dither_lookup));
nuclear@26 3342
nuclear@26 3343 # if defined(PNG_CORRECT_PALETTE_SUPPORTED)
nuclear@26 3344 PNG_EXTERN void png_correct_palette PNGARG((png_structp png_ptr,
nuclear@26 3345 png_colorp palette, int num_palette));
nuclear@26 3346 # endif
nuclear@26 3347 #endif
nuclear@26 3348
nuclear@26 3349 #if defined(PNG_READ_BGR_SUPPORTED) || defined(PNG_WRITE_BGR_SUPPORTED)
nuclear@26 3350 PNG_EXTERN void png_do_bgr PNGARG((png_row_infop row_info, png_bytep row));
nuclear@26 3351 #endif
nuclear@26 3352
nuclear@26 3353 #if defined(PNG_WRITE_PACK_SUPPORTED)
nuclear@26 3354 PNG_EXTERN void png_do_pack PNGARG((png_row_infop row_info,
nuclear@26 3355 png_bytep row, png_uint_32 bit_depth));
nuclear@26 3356 #endif
nuclear@26 3357
nuclear@26 3358 #if defined(PNG_WRITE_SHIFT_SUPPORTED)
nuclear@26 3359 PNG_EXTERN void png_do_shift PNGARG((png_row_infop row_info, png_bytep row,
nuclear@26 3360 png_color_8p bit_depth));
nuclear@26 3361 #endif
nuclear@26 3362
nuclear@26 3363 #if defined(PNG_READ_BACKGROUND_SUPPORTED)
nuclear@26 3364 #if defined(PNG_READ_GAMMA_SUPPORTED)
nuclear@26 3365 PNG_EXTERN void png_do_background PNGARG((png_row_infop row_info, png_bytep row,
nuclear@26 3366 png_color_16p trans_values, png_color_16p background,
nuclear@26 3367 png_color_16p background_1,
nuclear@26 3368 png_bytep gamma_table, png_bytep gamma_from_1, png_bytep gamma_to_1,
nuclear@26 3369 png_uint_16pp gamma_16, png_uint_16pp gamma_16_from_1,
nuclear@26 3370 png_uint_16pp gamma_16_to_1, int gamma_shift));
nuclear@26 3371 #else
nuclear@26 3372 PNG_EXTERN void png_do_background PNGARG((png_row_infop row_info, png_bytep row,
nuclear@26 3373 png_color_16p trans_values, png_color_16p background));
nuclear@26 3374 #endif
nuclear@26 3375 #endif
nuclear@26 3376
nuclear@26 3377 #if defined(PNG_READ_GAMMA_SUPPORTED)
nuclear@26 3378 PNG_EXTERN void png_do_gamma PNGARG((png_row_infop row_info, png_bytep row,
nuclear@26 3379 png_bytep gamma_table, png_uint_16pp gamma_16_table,
nuclear@26 3380 int gamma_shift));
nuclear@26 3381 #endif
nuclear@26 3382
nuclear@26 3383 #if defined(PNG_READ_EXPAND_SUPPORTED)
nuclear@26 3384 PNG_EXTERN void png_do_expand_palette PNGARG((png_row_infop row_info,
nuclear@26 3385 png_bytep row, png_colorp palette, png_bytep trans, int num_trans));
nuclear@26 3386 PNG_EXTERN void png_do_expand PNGARG((png_row_infop row_info,
nuclear@26 3387 png_bytep row, png_color_16p trans_value));
nuclear@26 3388 #endif
nuclear@26 3389
nuclear@26 3390 /* The following decodes the appropriate chunks, and does error correction,
nuclear@26 3391 * then calls the appropriate callback for the chunk if it is valid.
nuclear@26 3392 */
nuclear@26 3393
nuclear@26 3394 /* decode the IHDR chunk */
nuclear@26 3395 PNG_EXTERN void png_handle_IHDR PNGARG((png_structp png_ptr, png_infop info_ptr,
nuclear@26 3396 png_uint_32 length));
nuclear@26 3397 PNG_EXTERN void png_handle_PLTE PNGARG((png_structp png_ptr, png_infop info_ptr,
nuclear@26 3398 png_uint_32 length));
nuclear@26 3399 PNG_EXTERN void png_handle_IEND PNGARG((png_structp png_ptr, png_infop info_ptr,
nuclear@26 3400 png_uint_32 length));
nuclear@26 3401
nuclear@26 3402 #if defined(PNG_READ_bKGD_SUPPORTED)
nuclear@26 3403 PNG_EXTERN void png_handle_bKGD PNGARG((png_structp png_ptr, png_infop info_ptr,
nuclear@26 3404 png_uint_32 length));
nuclear@26 3405 #endif
nuclear@26 3406
nuclear@26 3407 #if defined(PNG_READ_cHRM_SUPPORTED)
nuclear@26 3408 PNG_EXTERN void png_handle_cHRM PNGARG((png_structp png_ptr, png_infop info_ptr,
nuclear@26 3409 png_uint_32 length));
nuclear@26 3410 #endif
nuclear@26 3411
nuclear@26 3412 #if defined(PNG_READ_gAMA_SUPPORTED)
nuclear@26 3413 PNG_EXTERN void png_handle_gAMA PNGARG((png_structp png_ptr, png_infop info_ptr,
nuclear@26 3414 png_uint_32 length));
nuclear@26 3415 #endif
nuclear@26 3416
nuclear@26 3417 #if defined(PNG_READ_hIST_SUPPORTED)
nuclear@26 3418 PNG_EXTERN void png_handle_hIST PNGARG((png_structp png_ptr, png_infop info_ptr,
nuclear@26 3419 png_uint_32 length));
nuclear@26 3420 #endif
nuclear@26 3421
nuclear@26 3422 #if defined(PNG_READ_iCCP_SUPPORTED)
nuclear@26 3423 extern void png_handle_iCCP PNGARG((png_structp png_ptr, png_infop info_ptr,
nuclear@26 3424 png_uint_32 length));
nuclear@26 3425 #endif /* PNG_READ_iCCP_SUPPORTED */
nuclear@26 3426
nuclear@26 3427 #if defined(PNG_READ_iTXt_SUPPORTED)
nuclear@26 3428 PNG_EXTERN void png_handle_iTXt PNGARG((png_structp png_ptr, png_infop info_ptr,
nuclear@26 3429 png_uint_32 length));
nuclear@26 3430 #endif
nuclear@26 3431
nuclear@26 3432 #if defined(PNG_READ_oFFs_SUPPORTED)
nuclear@26 3433 PNG_EXTERN void png_handle_oFFs PNGARG((png_structp png_ptr, png_infop info_ptr,
nuclear@26 3434 png_uint_32 length));
nuclear@26 3435 #endif
nuclear@26 3436
nuclear@26 3437 #if defined(PNG_READ_pCAL_SUPPORTED)
nuclear@26 3438 PNG_EXTERN void png_handle_pCAL PNGARG((png_structp png_ptr, png_infop info_ptr,
nuclear@26 3439 png_uint_32 length));
nuclear@26 3440 #endif
nuclear@26 3441
nuclear@26 3442 #if defined(PNG_READ_pHYs_SUPPORTED)
nuclear@26 3443 PNG_EXTERN void png_handle_pHYs PNGARG((png_structp png_ptr, png_infop info_ptr,
nuclear@26 3444 png_uint_32 length));
nuclear@26 3445 #endif
nuclear@26 3446
nuclear@26 3447 #if defined(PNG_READ_sBIT_SUPPORTED)
nuclear@26 3448 PNG_EXTERN void png_handle_sBIT PNGARG((png_structp png_ptr, png_infop info_ptr,
nuclear@26 3449 png_uint_32 length));
nuclear@26 3450 #endif
nuclear@26 3451
nuclear@26 3452 #if defined(PNG_READ_sCAL_SUPPORTED)
nuclear@26 3453 PNG_EXTERN void png_handle_sCAL PNGARG((png_structp png_ptr, png_infop info_ptr,
nuclear@26 3454 png_uint_32 length));
nuclear@26 3455 #endif
nuclear@26 3456
nuclear@26 3457 #if defined(PNG_READ_sPLT_SUPPORTED)
nuclear@26 3458 extern void png_handle_sPLT PNGARG((png_structp png_ptr, png_infop info_ptr,
nuclear@26 3459 png_uint_32 length));
nuclear@26 3460 #endif /* PNG_READ_sPLT_SUPPORTED */
nuclear@26 3461
nuclear@26 3462 #if defined(PNG_READ_sRGB_SUPPORTED)
nuclear@26 3463 PNG_EXTERN void png_handle_sRGB PNGARG((png_structp png_ptr, png_infop info_ptr,
nuclear@26 3464 png_uint_32 length));
nuclear@26 3465 #endif
nuclear@26 3466
nuclear@26 3467 #if defined(PNG_READ_tEXt_SUPPORTED)
nuclear@26 3468 PNG_EXTERN void png_handle_tEXt PNGARG((png_structp png_ptr, png_infop info_ptr,
nuclear@26 3469 png_uint_32 length));
nuclear@26 3470 #endif
nuclear@26 3471
nuclear@26 3472 #if defined(PNG_READ_tIME_SUPPORTED)
nuclear@26 3473 PNG_EXTERN void png_handle_tIME PNGARG((png_structp png_ptr, png_infop info_ptr,
nuclear@26 3474 png_uint_32 length));
nuclear@26 3475 #endif
nuclear@26 3476
nuclear@26 3477 #if defined(PNG_READ_tRNS_SUPPORTED)
nuclear@26 3478 PNG_EXTERN void png_handle_tRNS PNGARG((png_structp png_ptr, png_infop info_ptr,
nuclear@26 3479 png_uint_32 length));
nuclear@26 3480 #endif
nuclear@26 3481
nuclear@26 3482 #if defined(PNG_READ_zTXt_SUPPORTED)
nuclear@26 3483 PNG_EXTERN void png_handle_zTXt PNGARG((png_structp png_ptr, png_infop info_ptr,
nuclear@26 3484 png_uint_32 length));
nuclear@26 3485 #endif
nuclear@26 3486
nuclear@26 3487 PNG_EXTERN void png_handle_unknown PNGARG((png_structp png_ptr,
nuclear@26 3488 png_infop info_ptr, png_uint_32 length));
nuclear@26 3489
nuclear@26 3490 PNG_EXTERN void png_check_chunk_name PNGARG((png_structp png_ptr,
nuclear@26 3491 png_bytep chunk_name));
nuclear@26 3492
nuclear@26 3493 /* handle the transformations for reading and writing */
nuclear@26 3494 PNG_EXTERN void png_do_read_transformations PNGARG((png_structp png_ptr));
nuclear@26 3495 PNG_EXTERN void png_do_write_transformations PNGARG((png_structp png_ptr));
nuclear@26 3496
nuclear@26 3497 PNG_EXTERN void png_init_read_transformations PNGARG((png_structp png_ptr));
nuclear@26 3498
nuclear@26 3499 #ifdef PNG_PROGRESSIVE_READ_SUPPORTED
nuclear@26 3500 PNG_EXTERN void png_push_read_chunk PNGARG((png_structp png_ptr,
nuclear@26 3501 png_infop info_ptr));
nuclear@26 3502 PNG_EXTERN void png_push_read_sig PNGARG((png_structp png_ptr,
nuclear@26 3503 png_infop info_ptr));
nuclear@26 3504 PNG_EXTERN void png_push_check_crc PNGARG((png_structp png_ptr));
nuclear@26 3505 PNG_EXTERN void png_push_crc_skip PNGARG((png_structp png_ptr,
nuclear@26 3506 png_uint_32 length));
nuclear@26 3507 PNG_EXTERN void png_push_crc_finish PNGARG((png_structp png_ptr));
nuclear@26 3508 PNG_EXTERN void png_push_save_buffer PNGARG((png_structp png_ptr));
nuclear@26 3509 PNG_EXTERN void png_push_restore_buffer PNGARG((png_structp png_ptr,
nuclear@26 3510 png_bytep buffer, png_size_t buffer_length));
nuclear@26 3511 PNG_EXTERN void png_push_read_IDAT PNGARG((png_structp png_ptr));
nuclear@26 3512 PNG_EXTERN void png_process_IDAT_data PNGARG((png_structp png_ptr,
nuclear@26 3513 png_bytep buffer, png_size_t buffer_length));
nuclear@26 3514 PNG_EXTERN void png_push_process_row PNGARG((png_structp png_ptr));
nuclear@26 3515 PNG_EXTERN void png_push_handle_unknown PNGARG((png_structp png_ptr,
nuclear@26 3516 png_infop info_ptr, png_uint_32 length));
nuclear@26 3517 PNG_EXTERN void png_push_have_info PNGARG((png_structp png_ptr,
nuclear@26 3518 png_infop info_ptr));
nuclear@26 3519 PNG_EXTERN void png_push_have_end PNGARG((png_structp png_ptr,
nuclear@26 3520 png_infop info_ptr));
nuclear@26 3521 PNG_EXTERN void png_push_have_row PNGARG((png_structp png_ptr, png_bytep row));
nuclear@26 3522 PNG_EXTERN void png_push_read_end PNGARG((png_structp png_ptr,
nuclear@26 3523 png_infop info_ptr));
nuclear@26 3524 PNG_EXTERN void png_process_some_data PNGARG((png_structp png_ptr,
nuclear@26 3525 png_infop info_ptr));
nuclear@26 3526 PNG_EXTERN void png_read_push_finish_row PNGARG((png_structp png_ptr));
nuclear@26 3527 #if defined(PNG_READ_tEXt_SUPPORTED)
nuclear@26 3528 PNG_EXTERN void png_push_handle_tEXt PNGARG((png_structp png_ptr,
nuclear@26 3529 png_infop info_ptr, png_uint_32 length));
nuclear@26 3530 PNG_EXTERN void png_push_read_tEXt PNGARG((png_structp png_ptr,
nuclear@26 3531 png_infop info_ptr));
nuclear@26 3532 #endif
nuclear@26 3533 #if defined(PNG_READ_zTXt_SUPPORTED)
nuclear@26 3534 PNG_EXTERN void png_push_handle_zTXt PNGARG((png_structp png_ptr,
nuclear@26 3535 png_infop info_ptr, png_uint_32 length));
nuclear@26 3536 PNG_EXTERN void png_push_read_zTXt PNGARG((png_structp png_ptr,
nuclear@26 3537 png_infop info_ptr));
nuclear@26 3538 #endif
nuclear@26 3539 #if defined(PNG_READ_iTXt_SUPPORTED)
nuclear@26 3540 PNG_EXTERN void png_push_handle_iTXt PNGARG((png_structp png_ptr,
nuclear@26 3541 png_infop info_ptr, png_uint_32 length));
nuclear@26 3542 PNG_EXTERN void png_push_read_iTXt PNGARG((png_structp png_ptr,
nuclear@26 3543 png_infop info_ptr));
nuclear@26 3544 #endif
nuclear@26 3545
nuclear@26 3546 #endif /* PNG_PROGRESSIVE_READ_SUPPORTED */
nuclear@26 3547
nuclear@26 3548 #ifdef PNG_MNG_FEATURES_SUPPORTED
nuclear@26 3549 PNG_EXTERN void png_do_read_intrapixel PNGARG((png_row_infop row_info,
nuclear@26 3550 png_bytep row));
nuclear@26 3551 PNG_EXTERN void png_do_write_intrapixel PNGARG((png_row_infop row_info,
nuclear@26 3552 png_bytep row));
nuclear@26 3553 #endif
nuclear@26 3554
nuclear@26 3555 #if defined(PNG_ASSEMBLER_CODE_SUPPORTED)
nuclear@26 3556 #if defined(PNG_MMX_CODE_SUPPORTED)
nuclear@26 3557 /* png.c */ /* PRIVATE */
nuclear@26 3558 PNG_EXTERN void png_init_mmx_flags PNGARG((png_structp png_ptr));
nuclear@26 3559 #endif
nuclear@26 3560 #endif
nuclear@26 3561
nuclear@26 3562 #if defined(PNG_INCH_CONVERSIONS) && defined(PNG_FLOATING_POINT_SUPPORTED)
nuclear@26 3563 PNG_EXTERN png_uint_32 png_get_pixels_per_inch PNGARG((png_structp png_ptr,
nuclear@26 3564 png_infop info_ptr));
nuclear@26 3565
nuclear@26 3566 PNG_EXTERN png_uint_32 png_get_x_pixels_per_inch PNGARG((png_structp png_ptr,
nuclear@26 3567 png_infop info_ptr));
nuclear@26 3568
nuclear@26 3569 PNG_EXTERN png_uint_32 png_get_y_pixels_per_inch PNGARG((png_structp png_ptr,
nuclear@26 3570 png_infop info_ptr));
nuclear@26 3571
nuclear@26 3572 PNG_EXTERN float png_get_x_offset_inches PNGARG((png_structp png_ptr,
nuclear@26 3573 png_infop info_ptr));
nuclear@26 3574
nuclear@26 3575 PNG_EXTERN float png_get_y_offset_inches PNGARG((png_structp png_ptr,
nuclear@26 3576 png_infop info_ptr));
nuclear@26 3577
nuclear@26 3578 #if defined(PNG_pHYs_SUPPORTED)
nuclear@26 3579 PNG_EXTERN png_uint_32 png_get_pHYs_dpi PNGARG((png_structp png_ptr,
nuclear@26 3580 png_infop info_ptr, png_uint_32 *res_x, png_uint_32 *res_y, int *unit_type));
nuclear@26 3581 #endif /* PNG_pHYs_SUPPORTED */
nuclear@26 3582 #endif /* PNG_INCH_CONVERSIONS && PNG_FLOATING_POINT_SUPPORTED */
nuclear@26 3583
nuclear@26 3584 /* Read the chunk header (length + type name) */
nuclear@26 3585 PNG_EXTERN png_uint_32 png_read_chunk_header PNGARG((png_structp png_ptr));
nuclear@26 3586
nuclear@26 3587 /* Maintainer: Put new private prototypes here ^ and in libpngpf.3 */
nuclear@26 3588
nuclear@26 3589 #endif /* PNG_INTERNAL */
nuclear@26 3590
nuclear@26 3591 #ifdef __cplusplus
nuclear@26 3592 }
nuclear@26 3593 #endif
nuclear@26 3594
nuclear@26 3595 #endif /* PNG_VERSION_INFO_ONLY */
nuclear@26 3596 /* do not put anything past this line */
nuclear@26 3597 #endif /* PNG_H */