Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 1 | |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 2 | /* png.h - header file for PNG reference library |
Glenn Randers-Pehrson | b6ce43d | 1998-01-01 07:13:13 -0600 | [diff] [blame] | 3 | * |
Glenn Randers-Pehrson | 25228ab | 2002-03-31 07:33:55 -0600 | [diff] [blame^] | 4 | * libpng version 1.2.2beta6 - March 31, 2002 |
Glenn Randers-Pehrson | c6de22d | 2002-02-23 18:55:25 -0600 | [diff] [blame] | 5 | * Copyright (c) 1998-2002 Glenn Randers-Pehrson |
Glenn Randers-Pehrson | d436672 | 2000-06-04 14:29:29 -0500 | [diff] [blame] | 6 | * (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger) |
| 7 | * (Version 0.88 Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.) |
Glenn Randers-Pehrson | c4a2ae6 | 1998-01-16 22:06:18 -0600 | [diff] [blame] | 8 | * |
Glenn Randers-Pehrson | 4393a9a | 1999-09-17 12:27:26 -0500 | [diff] [blame] | 9 | * Authors and maintainers: |
Glenn Randers-Pehrson | 68ea243 | 2000-04-01 21:10:05 -0600 | [diff] [blame] | 10 | * libpng versions 0.71, May 1995, through 0.88, January 1996: Guy Schalnat |
| 11 | * libpng versions 0.89c, June 1996, through 0.96, May 1997: Andreas Dilger |
Glenn Randers-Pehrson | 25228ab | 2002-03-31 07:33:55 -0600 | [diff] [blame^] | 12 | * libpng versions 0.97, January 1998, through 1.2.2beta6 - March 31, 2002: Glenn |
Glenn Randers-Pehrson | 4393a9a | 1999-09-17 12:27:26 -0500 | [diff] [blame] | 13 | * See also "Contributing Authors", below. |
| 14 | * |
Glenn Randers-Pehrson | 520a764 | 2000-03-21 05:13:06 -0600 | [diff] [blame] | 15 | * Note about libpng version numbers: |
| 16 | * |
| 17 | * Due to various miscommunications, unforeseen code incompatibilities |
| 18 | * and occasional factors outside the authors' control, version numbering |
| 19 | * on the library has not always been consistent and straightforward. |
| 20 | * The following table summarizes matters since version 0.89c, which was |
| 21 | * the first widely used release: |
| 22 | * |
Glenn Randers-Pehrson | 7529457 | 2000-05-06 14:09:57 -0500 | [diff] [blame] | 23 | * source png.h png.h shared-lib |
| 24 | * version string int version |
| 25 | * ------- ------ ----- ---------- |
| 26 | * 0.89c "1.0 beta 3" 0.89 89 1.0.89 |
| 27 | * 0.90 "1.0 beta 4" 0.90 90 0.90 [should have been 2.0.90] |
| 28 | * 0.95 "1.0 beta 5" 0.95 95 0.95 [should have been 2.0.95] |
| 29 | * 0.96 "1.0 beta 6" 0.96 96 0.96 [should have been 2.0.96] |
| 30 | * 0.97b "1.00.97 beta 7" 1.00.97 97 1.0.1 [should have been 2.0.97] |
| 31 | * 0.97c 0.97 97 2.0.97 |
| 32 | * 0.98 0.98 98 2.0.98 |
| 33 | * 0.99 0.99 98 2.0.99 |
| 34 | * 0.99a-m 0.99 99 2.0.99 |
| 35 | * 1.00 1.00 100 2.1.0 [100 should be 10000] |
| 36 | * 1.0.0 (from here on, the 100 2.1.0 [100 should be 10000] |
| 37 | * 1.0.1 png.h string is 10001 2.1.0 |
| 38 | * 1.0.1a-e identical to the 10002 from here on, the shared library |
| 39 | * 1.0.2 source version) 10002 is 2.V where V is the source code |
| 40 | * 1.0.2a-b 10003 version, except as noted. |
| 41 | * 1.0.3 10003 |
| 42 | * 1.0.3a-d 10004 |
| 43 | * 1.0.4 10004 |
| 44 | * 1.0.4a-f 10005 |
| 45 | * 1.0.5 (+ 2 patches) 10005 |
| 46 | * 1.0.5a-d 10006 |
| 47 | * 1.0.5e-r 10100 (not source compatible) |
| 48 | * 1.0.5s-v 10006 (not binary compatible) |
| 49 | * 1.0.6 (+ 3 patches) 10006 (still binary incompatible) |
| 50 | * 1.0.6d-f 10007 (still binary incompatible) |
| 51 | * 1.0.6g 10007 |
| 52 | * 1.0.6h 10007 10.6h (testing xy.z so-numbering) |
| 53 | * 1.0.6i 10007 10.6i |
| 54 | * 1.0.6j 10007 2.1.0.6j (incompatible with 1.0.0) |
Glenn Randers-Pehrson | be9de0f | 2001-01-22 08:52:16 -0600 | [diff] [blame] | 55 | * 1.0.7beta11-14 DLLNUM 10007 2.1.0.7beta11-14 (binary compatible) |
| 56 | * 1.0.7beta15-18 1 10007 2.1.0.7beta15-18 (binary compatible) |
| 57 | * 1.0.7rc1-2 1 10007 2.1.0.7rc1-2 (binary compatible) |
| 58 | * 1.0.7 1 10007 (still compatible) |
| 59 | * 1.0.8beta1-4 1 10008 2.1.0.8beta1-4 |
| 60 | * 1.0.8rc1 1 10008 2.1.0.8rc1 |
| 61 | * 1.0.8 1 10008 2.1.0.8 |
| 62 | * 1.0.9beta1-6 1 10009 2.1.0.9beta1-6 |
| 63 | * 1.0.9rc1 1 10009 2.1.0.9rc1 |
| 64 | * 1.0.9beta7-10 1 10009 2.1.0.9beta7-10 |
| 65 | * 1.0.9rc2 1 10009 2.1.0.9rc2 |
Glenn Randers-Pehrson | d4e8109 | 2001-01-31 05:56:52 -0600 | [diff] [blame] | 66 | * 1.0.9 1 10009 2.1.0.9 |
Glenn Randers-Pehrson | 1909560 | 2001-03-14 07:08:39 -0600 | [diff] [blame] | 67 | * 1.0.10beta1 1 10010 2.1.0.10beta1 |
Glenn Randers-Pehrson | e164447 | 2001-03-23 05:06:56 -0600 | [diff] [blame] | 68 | * 1.0.10rc1 1 10010 2.1.0.10rc1 |
Glenn Randers-Pehrson | 13cfbac | 2001-03-30 06:42:28 -0600 | [diff] [blame] | 69 | * 1.0.10 1 10010 2.1.0.10 |
Glenn Randers-Pehrson | e1eff58 | 2001-04-14 20:15:41 -0500 | [diff] [blame] | 70 | * 1.0.11beta1-3 1 10011 2.1.0.11beta1-3 |
Glenn Randers-Pehrson | 82ae383 | 2001-04-20 10:32:10 -0500 | [diff] [blame] | 71 | * 1.0.11rc1 1 10011 2.1.0.11rc1 |
Glenn Randers-Pehrson | 3283539 | 2001-04-27 08:29:32 -0500 | [diff] [blame] | 72 | * 1.0.11 1 10011 2.1.0.11 |
Glenn Randers-Pehrson | b182893 | 2001-06-23 08:03:17 -0500 | [diff] [blame] | 73 | * 1.0.12beta1-2 2 10012 2.1.0.12beta1-2 |
| 74 | * 1.0.12rc1 2 10012 2.1.0.12rc1 |
| 75 | * 1.0.12 2 10012 2.1.0.12 |
| 76 | * 1.1.0a-f - 10100 2.1.1.0a-f (branch abandoned) |
Glenn Randers-Pehrson | 8b6a889 | 2001-05-18 04:54:50 -0500 | [diff] [blame] | 77 | * 1.2.0beta1-2 2 10200 2.1.2.0beta1-2 |
Glenn Randers-Pehrson | 5a0be34 | 2001-10-18 20:55:13 -0500 | [diff] [blame] | 78 | * 1.2.0beta3-5 3 10200 3.1.2.0beta3-5 |
| 79 | * 1.2.0rc1 3 10200 3.1.2.0rc1 |
| 80 | * 1.2.0 3 10200 3.1.2.0 |
Glenn Randers-Pehrson | 5cded0b | 2001-11-07 07:10:08 -0600 | [diff] [blame] | 81 | * 1.2.1beta1-4 3 10201 3.1.2.1beta1-4 |
Glenn Randers-Pehrson | db3b88d | 2001-12-04 06:30:43 -0600 | [diff] [blame] | 82 | * 1.2.1rc1-2 3 10201 3.1.2.1rc1-2 |
| 83 | * 1.2.1 3 10201 3.1.2.1 |
Glenn Randers-Pehrson | 25228ab | 2002-03-31 07:33:55 -0600 | [diff] [blame^] | 84 | * 1.2.2beta1-6 12 10202 12.so.0.1.2.2beta1-6 |
Glenn Randers-Pehrson | 520a764 | 2000-03-21 05:13:06 -0600 | [diff] [blame] | 85 | * |
Glenn Randers-Pehrson | 326320e | 2000-04-24 07:43:17 -0500 | [diff] [blame] | 86 | * Henceforth the source version will match the shared-library major |
| 87 | * and minor numbers; the shared-library major version number will be |
Glenn Randers-Pehrson | 520a764 | 2000-03-21 05:13:06 -0600 | [diff] [blame] | 88 | * used for changes in backward compatibility, as it is intended. The |
Glenn Randers-Pehrson | be9de0f | 2001-01-22 08:52:16 -0600 | [diff] [blame] | 89 | * PNG_LIBPNG_VER macro, which is not used within libpng but is available |
Glenn Randers-Pehrson | 520a764 | 2000-03-21 05:13:06 -0600 | [diff] [blame] | 90 | * for applications, is an unsigned integer of the form xyyzz corresponding |
Glenn Randers-Pehrson | 81fdf8a | 2000-04-07 10:34:56 -0500 | [diff] [blame] | 91 | * to the source version x.y.z (leading zeros in y and z). Beta versions |
Glenn Randers-Pehrson | 7529457 | 2000-05-06 14:09:57 -0500 | [diff] [blame] | 92 | * were given the previous public release number plus a letter, until |
| 93 | * version 1.0.6j; from then on they were given the upcoming public |
Glenn Randers-Pehrson | ec61c23 | 2000-05-16 06:17:36 -0500 | [diff] [blame] | 94 | * release number plus "betaNN" or "rcN". |
Glenn Randers-Pehrson | 520a764 | 2000-03-21 05:13:06 -0600 | [diff] [blame] | 95 | * |
Glenn Randers-Pehrson | 326320e | 2000-04-24 07:43:17 -0500 | [diff] [blame] | 96 | * Binary incompatibility exists only when applications make direct access |
| 97 | * to the info_ptr or png_ptr members through png.h, and the compiled |
| 98 | * application is loaded with a different version of the library. |
| 99 | * |
Glenn Randers-Pehrson | be9de0f | 2001-01-22 08:52:16 -0600 | [diff] [blame] | 100 | * DLLNUM will change each time there are forward or backward changes |
| 101 | * in binary compatibility (e.g., when a new feature is added). |
| 102 | * |
Glenn Randers-Pehrson | 520a764 | 2000-03-21 05:13:06 -0600 | [diff] [blame] | 103 | * See libpng.txt or libpng.3 for more information. The PNG specification |
| 104 | * is available as RFC 2083 <ftp://ftp.uu.net/graphics/png/documents/> |
| 105 | * and as a W3C Recommendation <http://www.w3.org/TR/REC.png.html> |
| 106 | */ |
| 107 | |
| 108 | /* |
Glenn Randers-Pehrson | 68ea243 | 2000-04-01 21:10:05 -0600 | [diff] [blame] | 109 | * COPYRIGHT NOTICE, DISCLAIMER, and LICENSE: |
| 110 | * |
Glenn Randers-Pehrson | d436672 | 2000-06-04 14:29:29 -0500 | [diff] [blame] | 111 | * If you modify libpng you may insert additional notices immediately following |
| 112 | * this sentence. |
Glenn Randers-Pehrson | 520a764 | 2000-03-21 05:13:06 -0600 | [diff] [blame] | 113 | * |
Glenn Randers-Pehrson | 25228ab | 2002-03-31 07:33:55 -0600 | [diff] [blame^] | 114 | * libpng versions 1.0.7, July 1, 2000, through 1.2.2beta6, March 31, 2002, are |
Glenn Randers-Pehrson | 73d57cb | 2002-03-25 18:49:08 -0600 | [diff] [blame] | 115 | * Copyright (c) 2000-2001 Glenn Randers-Pehrson, and are |
Glenn Randers-Pehrson | 32fc5ce | 2000-07-24 06:34:14 -0500 | [diff] [blame] | 116 | * distributed according to the same disclaimer and license as libpng-1.0.6 |
Glenn Randers-Pehrson | 3d5a520 | 2000-07-01 15:37:28 -0500 | [diff] [blame] | 117 | * with the following individuals added to the list of Contributing Authors |
Glenn Randers-Pehrson | d436672 | 2000-06-04 14:29:29 -0500 | [diff] [blame] | 118 | * |
| 119 | * Simon-Pierre Cadieux |
| 120 | * Eric S. Raymond |
| 121 | * Gilles Vollant |
| 122 | * |
Glenn Randers-Pehrson | 3d5a520 | 2000-07-01 15:37:28 -0500 | [diff] [blame] | 123 | * and with the following additions to the disclaimer: |
| 124 | * |
| 125 | * There is no warranty against interference with your enjoyment of the |
| 126 | * library or against infringement. There is no warranty that our |
| 127 | * efforts or the library will fulfill any of your particular purposes |
| 128 | * or needs. This library is provided with all faults, and the entire |
| 129 | * risk of satisfactory quality, performance, accuracy, and effort is with |
| 130 | * the user. |
| 131 | * |
| 132 | * libpng versions 0.97, January 1998, through 1.0.6, March 20, 2000, are |
| 133 | * Copyright (c) 1998, 1999, 2000 Glenn Randers-Pehrson |
Glenn Randers-Pehrson | d436672 | 2000-06-04 14:29:29 -0500 | [diff] [blame] | 134 | * Distributed according to the same disclaimer and license as libpng-0.96, |
| 135 | * with the following individuals added to the list of Contributing Authors: |
| 136 | * |
| 137 | * Tom Lane |
| 138 | * Glenn Randers-Pehrson |
| 139 | * Willem van Schaik |
| 140 | * |
| 141 | * libpng versions 0.89, June 1996, through 0.96, May 1997, are |
Glenn Randers-Pehrson | 520a764 | 2000-03-21 05:13:06 -0600 | [diff] [blame] | 142 | * Copyright (c) 1996, 1997 Andreas Dilger |
Glenn Randers-Pehrson | d436672 | 2000-06-04 14:29:29 -0500 | [diff] [blame] | 143 | * Distributed according to the same disclaimer and license as libpng-0.88, |
| 144 | * with the following individuals added to the list of Contributing Authors: |
Glenn Randers-Pehrson | 520a764 | 2000-03-21 05:13:06 -0600 | [diff] [blame] | 145 | * |
| 146 | * John Bowler |
| 147 | * Kevin Bracey |
| 148 | * Sam Bushell |
Glenn Randers-Pehrson | 520a764 | 2000-03-21 05:13:06 -0600 | [diff] [blame] | 149 | * Magnus Holmgren |
Glenn Randers-Pehrson | 520a764 | 2000-03-21 05:13:06 -0600 | [diff] [blame] | 150 | * Greg Roelofs |
Glenn Randers-Pehrson | d436672 | 2000-06-04 14:29:29 -0500 | [diff] [blame] | 151 | * Tom Tanner |
| 152 | * |
| 153 | * libpng versions 0.5, May 1995, through 0.88, January 1996, are |
| 154 | * Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc. |
| 155 | * |
| 156 | * For the purposes of this copyright and license, "Contributing Authors" |
| 157 | * is defined as the following set of individuals: |
| 158 | * |
| 159 | * Andreas Dilger |
| 160 | * Dave Martindale |
Glenn Randers-Pehrson | 520a764 | 2000-03-21 05:13:06 -0600 | [diff] [blame] | 161 | * Guy Eric Schalnat |
| 162 | * Paul Schmidt |
Glenn Randers-Pehrson | 520a764 | 2000-03-21 05:13:06 -0600 | [diff] [blame] | 163 | * Tim Wegner |
| 164 | * |
| 165 | * The PNG Reference Library is supplied "AS IS". The Contributing Authors |
| 166 | * and Group 42, Inc. disclaim all warranties, expressed or implied, |
| 167 | * including, without limitation, the warranties of merchantability and of |
| 168 | * fitness for any purpose. The Contributing Authors and Group 42, Inc. |
| 169 | * assume no liability for direct, indirect, incidental, special, exemplary, |
| 170 | * or consequential damages, which may result from the use of the PNG |
| 171 | * Reference Library, even if advised of the possibility of such damage. |
| 172 | * |
| 173 | * Permission is hereby granted to use, copy, modify, and distribute this |
| 174 | * source code, or portions hereof, for any purpose, without fee, subject |
| 175 | * to the following restrictions: |
| 176 | * |
| 177 | * 1. The origin of this source code must not be misrepresented. |
| 178 | * |
Glenn Randers-Pehrson | 1909560 | 2001-03-14 07:08:39 -0600 | [diff] [blame] | 179 | * 2. Altered versions must be plainly marked as such and |
| 180 | * must not be misrepresented as being the original source. |
Glenn Randers-Pehrson | 520a764 | 2000-03-21 05:13:06 -0600 | [diff] [blame] | 181 | * |
Glenn Randers-Pehrson | 1909560 | 2001-03-14 07:08:39 -0600 | [diff] [blame] | 182 | * 3. This Copyright notice may not be removed or altered from |
| 183 | * any source or altered source distribution. |
Glenn Randers-Pehrson | 520a764 | 2000-03-21 05:13:06 -0600 | [diff] [blame] | 184 | * |
| 185 | * The Contributing Authors and Group 42, Inc. specifically permit, without |
| 186 | * fee, and encourage the use of this source code as a component to |
| 187 | * supporting the PNG file format in commercial products. If you use this |
| 188 | * source code in a product, acknowledgment is not required but would be |
| 189 | * appreciated. |
| 190 | */ |
| 191 | |
| 192 | /* |
| 193 | * A "png_get_copyright" function is available, for convenient use in "about" |
| 194 | * boxes and the like: |
| 195 | * |
| 196 | * printf("%s",png_get_copyright(NULL)); |
| 197 | * |
| 198 | * Also, the PNG logo (in PNG format, of course) is supplied in the |
Glenn Randers-Pehrson | a4d54bd | 2000-07-14 08:15:12 -0500 | [diff] [blame] | 199 | * files "pngbar.png" and "pngbar.jpg (88x31) and "pngnow.png" (98x31). |
Glenn Randers-Pehrson | 520a764 | 2000-03-21 05:13:06 -0600 | [diff] [blame] | 200 | */ |
| 201 | |
| 202 | /* |
| 203 | * Libpng is OSI Certified Open Source Software. OSI Certified is a |
| 204 | * certification mark of the Open Source Initiative. |
| 205 | */ |
| 206 | |
| 207 | /* |
| 208 | * The contributing authors would like to thank all those who helped |
| 209 | * with testing, bug fixes, and patience. This wouldn't have been |
| 210 | * possible without all of you. |
| 211 | * |
| 212 | * Thanks to Frank J. T. Wojcik for helping with the documentation. |
| 213 | */ |
| 214 | |
| 215 | /* |
Glenn Randers-Pehrson | 87544ac | 1999-01-13 22:06:39 -0600 | [diff] [blame] | 216 | * Y2K compliance in libpng: |
| 217 | * ========================= |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame] | 218 | * |
Glenn Randers-Pehrson | 25228ab | 2002-03-31 07:33:55 -0600 | [diff] [blame^] | 219 | * March 31, 2002 |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame] | 220 | * |
Glenn Randers-Pehrson | 87544ac | 1999-01-13 22:06:39 -0600 | [diff] [blame] | 221 | * Since the PNG Development group is an ad-hoc body, we can't make |
| 222 | * an official declaration. |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame] | 223 | * |
Glenn Randers-Pehrson | 4393a9a | 1999-09-17 12:27:26 -0500 | [diff] [blame] | 224 | * This is your unofficial assurance that libpng from version 0.71 and |
Glenn Randers-Pehrson | 25228ab | 2002-03-31 07:33:55 -0600 | [diff] [blame^] | 225 | * upward through 1.2.2beta6 are Y2K compliant. It is my belief that earlier |
Glenn Randers-Pehrson | 4393a9a | 1999-09-17 12:27:26 -0500 | [diff] [blame] | 226 | * versions were also Y2K compliant. |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame] | 227 | * |
Glenn Randers-Pehrson | 87544ac | 1999-01-13 22:06:39 -0600 | [diff] [blame] | 228 | * Libpng only has three year fields. One is a 2-byte unsigned integer |
| 229 | * that will hold years up to 65535. The other two hold the date in text |
| 230 | * format, and will hold years up to 9999. |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame] | 231 | * |
Glenn Randers-Pehrson | 87544ac | 1999-01-13 22:06:39 -0600 | [diff] [blame] | 232 | * The integer is |
| 233 | * "png_uint_16 year" in png_time_struct. |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame] | 234 | * |
Glenn Randers-Pehrson | 87544ac | 1999-01-13 22:06:39 -0600 | [diff] [blame] | 235 | * The strings are |
| 236 | * "png_charp time_buffer" in png_struct and |
| 237 | * "near_time_buffer", which is a local character string in png.c. |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame] | 238 | * |
Glenn Randers-Pehrson | 87544ac | 1999-01-13 22:06:39 -0600 | [diff] [blame] | 239 | * There are seven time-related functions: |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame] | 240 | * png.c: png_convert_to_rfc_1123() in png.c |
Glenn Randers-Pehrson | 87544ac | 1999-01-13 22:06:39 -0600 | [diff] [blame] | 241 | * (formerly png_convert_to_rfc_1152() in error) |
| 242 | * png_convert_from_struct_tm() in pngwrite.c, called in pngwrite.c |
| 243 | * png_convert_from_time_t() in pngwrite.c |
| 244 | * png_get_tIME() in pngget.c |
| 245 | * png_handle_tIME() in pngrutil.c, called in pngread.c |
| 246 | * png_set_tIME() in pngset.c |
| 247 | * png_write_tIME() in pngwutil.c, called in pngwrite.c |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame] | 248 | * |
| 249 | * All handle dates properly in a Y2K environment. The |
Glenn Randers-Pehrson | 87544ac | 1999-01-13 22:06:39 -0600 | [diff] [blame] | 250 | * png_convert_from_time_t() function calls gmtime() to convert from system |
| 251 | * clock time, which returns (year - 1900), which we properly convert to |
| 252 | * the full 4-digit year. There is a possibility that applications using |
| 253 | * libpng are not passing 4-digit years into the png_convert_to_rfc_1123() |
Glenn Randers-Pehrson | 4393a9a | 1999-09-17 12:27:26 -0500 | [diff] [blame] | 254 | * function, or that they are incorrectly passing only a 2-digit year |
| 255 | * instead of "year - 1900" into the png_convert_from_struct_tm() function, |
| 256 | * but this is not under our control. The libpng documentation has always |
| 257 | * stated that it works with 4-digit years, and the APIs have been |
| 258 | * documented as such. |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame] | 259 | * |
Glenn Randers-Pehrson | 87544ac | 1999-01-13 22:06:39 -0600 | [diff] [blame] | 260 | * The tIME chunk itself is also Y2K compliant. It uses a 2-byte unsigned |
| 261 | * integer to hold the year, and can hold years as large as 65535. |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame] | 262 | * |
Glenn Randers-Pehrson | 4393a9a | 1999-09-17 12:27:26 -0500 | [diff] [blame] | 263 | * zlib, upon which libpng depends, is also Y2K compliant. It contains |
| 264 | * no date-related code. |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame] | 265 | * |
Glenn Randers-Pehrson | 87544ac | 1999-01-13 22:06:39 -0600 | [diff] [blame] | 266 | * Glenn Randers-Pehrson |
| 267 | * libpng maintainer |
| 268 | * PNG Development Group |
Glenn Randers-Pehrson | bcfd15d | 1999-10-01 14:22:25 -0500 | [diff] [blame] | 269 | */ |
| 270 | |
Glenn Randers-Pehrson | 1394480 | 2000-06-24 07:42:42 -0500 | [diff] [blame] | 271 | #ifndef PNG_H |
| 272 | #define PNG_H |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 273 | |
| 274 | /* This is not the place to learn how to use libpng. The file libpng.txt |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 275 | * describes how to use libpng, and the file example.c summarizes it |
| 276 | * with some code on which to build. This file is useful for looking |
| 277 | * at the actual function definitions and structure components. |
| 278 | */ |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 279 | |
Glenn Randers-Pehrson | 1ef65b6 | 2000-05-12 06:19:53 -0500 | [diff] [blame] | 280 | /* Version information for png.h - this should match the version in png.c */ |
Glenn Randers-Pehrson | 25228ab | 2002-03-31 07:33:55 -0600 | [diff] [blame^] | 281 | #define PNG_LIBPNG_VER_STRING "1.2.2beta6" |
Glenn Randers-Pehrson | 1ef65b6 | 2000-05-12 06:19:53 -0500 | [diff] [blame] | 282 | |
Glenn Randers-Pehrson | 9c0f094 | 2002-02-21 23:14:23 -0600 | [diff] [blame] | 283 | #define PNG_LIBPNG_VER_SONUM 0 |
Glenn Randers-Pehrson | be9de0f | 2001-01-22 08:52:16 -0600 | [diff] [blame] | 284 | #define PNG_LIBPNG_VER_DLLNUM %DLLNUM% |
Glenn Randers-Pehrson | 1ef65b6 | 2000-05-12 06:19:53 -0500 | [diff] [blame] | 285 | |
| 286 | /* These should match the first 3 components of PNG_LIBPNG_VER_STRING: */ |
| 287 | #define PNG_LIBPNG_VER_MAJOR 1 |
Glenn Randers-Pehrson | 1fd5fb3 | 2001-05-06 05:34:26 -0500 | [diff] [blame] | 288 | #define PNG_LIBPNG_VER_MINOR 2 |
Glenn Randers-Pehrson | 9c0f094 | 2002-02-21 23:14:23 -0600 | [diff] [blame] | 289 | #define PNG_LIBPNG_VER_RELEASE 2 |
Glenn Randers-Pehrson | 1ef65b6 | 2000-05-12 06:19:53 -0500 | [diff] [blame] | 290 | /* This should match the numeric part of the final component of |
| 291 | * PNG_LIBPNG_VER_STRING, omitting any leading zero: */ |
Glenn Randers-Pehrson | d56aca7 | 2000-11-23 11:51:42 -0600 | [diff] [blame] | 292 | |
Glenn Randers-Pehrson | 25228ab | 2002-03-31 07:33:55 -0600 | [diff] [blame^] | 293 | #define PNG_LIBPNG_VER_BUILD 6 |
Glenn Randers-Pehrson | d56aca7 | 2000-11-23 11:51:42 -0600 | [diff] [blame] | 294 | |
| 295 | #define PNG_LIBPNG_BUILD_ALPHA 1 |
| 296 | #define PNG_LIBPNG_BUILD_BETA 2 |
| 297 | #define PNG_LIBPNG_BUILD_RC 3 |
| 298 | #define PNG_LIBPNG_BUILD_STABLE 4 |
| 299 | #define PNG_LIBPNG_BUILD_TYPEMASK 7 |
| 300 | #define PNG_LIBPNG_BUILD_PATCH 8 /* Can be OR'ed with STABLE only */ |
Glenn Randers-Pehrson | 9c0f094 | 2002-02-21 23:14:23 -0600 | [diff] [blame] | 301 | #define PNG_LIBPNG_BUILD_TYPE 2 |
Glenn Randers-Pehrson | 1ef65b6 | 2000-05-12 06:19:53 -0500 | [diff] [blame] | 302 | |
| 303 | /* Careful here. At one time, Guy wanted to use 082, but that would be octal. |
| 304 | * We must not include leading zeros. |
| 305 | * Versions 0.7 through 1.0.0 were in the range 0 to 100 here (only |
| 306 | * version 1.0.0 was mis-numbered 100 instead of 10000). From |
| 307 | * version 1.0.1 it's xxyyzz, where x=major, y=minor, z=release */ |
Glenn Randers-Pehrson | 9c0f094 | 2002-02-21 23:14:23 -0600 | [diff] [blame] | 308 | #define PNG_LIBPNG_VER 10202 /* 1.2.2 */ |
Glenn Randers-Pehrson | 1ef65b6 | 2000-05-12 06:19:53 -0500 | [diff] [blame] | 309 | |
Glenn Randers-Pehrson | 1ef65b6 | 2000-05-12 06:19:53 -0500 | [diff] [blame] | 310 | #ifndef PNG_VERSION_INFO_ONLY |
| 311 | |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 312 | /* include the compression library's header */ |
| 313 | #include "zlib.h" |
| 314 | |
Glenn Randers-Pehrson | 231e687 | 2001-01-12 15:13:06 -0600 | [diff] [blame] | 315 | /* include all user configurable info, including optional assembler routines */ |
Guy Schalnat | 51f0eb4 | 1995-09-26 05:22:39 -0500 | [diff] [blame] | 316 | #include "pngconf.h" |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 317 | |
Glenn Randers-Pehrson | 4393a9a | 1999-09-17 12:27:26 -0500 | [diff] [blame] | 318 | /* Inhibit C++ name-mangling for libpng functions but not for system calls. */ |
| 319 | #ifdef __cplusplus |
| 320 | extern "C" { |
| 321 | #endif /* __cplusplus */ |
| 322 | |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 323 | /* This file is arranged in several sections. The first section contains |
| 324 | * structure and type definitions. The second section contains the external |
| 325 | * library functions, while the third has the internal library functions, |
| 326 | * which applications aren't expected to use directly. |
| 327 | */ |
Guy Schalnat | 51f0eb4 | 1995-09-26 05:22:39 -0500 | [diff] [blame] | 328 | |
Glenn Randers-Pehrson | ae498dc | 2001-11-24 14:53:31 -0600 | [diff] [blame] | 329 | #ifndef PNG_NO_TYPECAST_NULL |
Glenn Randers-Pehrson | 5cded0b | 2001-11-07 07:10:08 -0600 | [diff] [blame] | 330 | #define int_p_NULL (int *)NULL |
| 331 | #define png_bytep_NULL (png_bytep)NULL |
| 332 | #define png_bytepp_NULL (png_bytepp)NULL |
| 333 | #define png_doublep_NULL (png_doublep)NULL |
| 334 | #define png_error_ptr_NULL (png_error_ptr)NULL |
| 335 | #define png_flush_ptr_NULL (png_flush_ptr)NULL |
| 336 | #define png_free_ptr_NULL (png_free_ptr)NULL |
| 337 | #define png_infopp_NULL (png_infopp)NULL |
| 338 | #define png_malloc_ptr_NULL (png_malloc_ptr)NULL |
| 339 | #define png_read_status_ptr_NULL (png_read_status_ptr)NULL |
| 340 | #define png_rw_ptr_NULL (png_rw_ptr)NULL |
| 341 | #define png_structp_NULL (png_structp)NULL |
| 342 | #define png_uint_16p_NULL (png_uint_16p)NULL |
| 343 | #define png_voidp_NULL (png_voidp)NULL |
| 344 | #define png_write_status_ptr_NULL (png_write_status_ptr)NULL |
| 345 | #else |
| 346 | #define int_p_NULL NULL |
| 347 | #define png_bytep_NULL NULL |
| 348 | #define png_bytepp_NULL NULL |
| 349 | #define png_doublep_NULL NULL |
| 350 | #define png_error_ptr_NULL NULL |
| 351 | #define png_flush_ptr_NULL NULL |
| 352 | #define png_free_ptr_NULL NULL |
| 353 | #define png_infopp_NULL NULL |
| 354 | #define png_malloc_ptr_NULL NULL |
| 355 | #define png_read_status_ptr_NULL NULL |
| 356 | #define png_rw_ptr_NULL NULL |
| 357 | #define png_structp_NULL NULL |
| 358 | #define png_uint_16p_NULL NULL |
| 359 | #define png_voidp_NULL NULL |
| 360 | #define png_write_status_ptr_NULL NULL |
| 361 | #endif |
Glenn Randers-Pehrson | 3f54925 | 2001-10-27 07:35:13 -0500 | [diff] [blame] | 362 | |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 363 | /* variables declared in png.c - only it needs to define PNG_NO_EXTERN */ |
Glenn Randers-Pehrson | 46f61e2 | 1998-01-30 21:45:12 -0600 | [diff] [blame] | 364 | #if !defined(PNG_NO_EXTERN) || defined(PNG_ALWAYS_EXTERN) |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 365 | /* Version information for C files, stored in png.c. This had better match |
| 366 | * the version above. |
| 367 | */ |
Glenn Randers-Pehrson | 074af5e | 1999-11-28 23:32:18 -0600 | [diff] [blame] | 368 | #ifdef PNG_USE_GLOBAL_ARRAYS |
Glenn Randers-Pehrson | 5e5c1e1 | 2000-11-10 12:26:19 -0600 | [diff] [blame] | 369 | PNG_EXPORT_VAR (const char) png_libpng_ver[18]; |
| 370 | /* need room for 99.99.99beta99z*/ |
Glenn Randers-Pehrson | 5379b24 | 1999-11-27 10:22:33 -0600 | [diff] [blame] | 371 | #else |
| 372 | #define png_libpng_ver png_get_header_ver(NULL) |
| 373 | #endif |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 374 | |
Glenn Randers-Pehrson | 074af5e | 1999-11-28 23:32:18 -0600 | [diff] [blame] | 375 | #ifdef PNG_USE_GLOBAL_ARRAYS |
Glenn Randers-Pehrson | 5379b24 | 1999-11-27 10:22:33 -0600 | [diff] [blame] | 376 | /* This was removed in version 1.0.5c */ |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 377 | /* Structures to facilitate easy interlacing. See png.c for more details */ |
Glenn Randers-Pehrson | 5e5c1e1 | 2000-11-10 12:26:19 -0600 | [diff] [blame] | 378 | PNG_EXPORT_VAR (const int FARDATA) png_pass_start[7]; |
| 379 | PNG_EXPORT_VAR (const int FARDATA) png_pass_inc[7]; |
| 380 | PNG_EXPORT_VAR (const int FARDATA) png_pass_ystart[7]; |
| 381 | PNG_EXPORT_VAR (const int FARDATA) png_pass_yinc[7]; |
| 382 | PNG_EXPORT_VAR (const int FARDATA) png_pass_mask[7]; |
| 383 | PNG_EXPORT_VAR (const int FARDATA) png_pass_dsp_mask[7]; |
Glenn Randers-Pehrson | a77ef62 | 2000-02-18 13:48:52 -0600 | [diff] [blame] | 384 | #ifdef PNG_HAVE_ASSEMBLER_COMBINE_ROW |
Glenn Randers-Pehrson | 5e5c1e1 | 2000-11-10 12:26:19 -0600 | [diff] [blame] | 385 | PNG_EXPORT_VAR (const int FARDATA) png_pass_width[7]; |
Glenn Randers-Pehrson | a77ef62 | 2000-02-18 13:48:52 -0600 | [diff] [blame] | 386 | #endif |
| 387 | /* This isn't currently used. If you need it, see png.c for more details. |
Glenn Randers-Pehrson | 5e5c1e1 | 2000-11-10 12:26:19 -0600 | [diff] [blame] | 388 | PNG_EXPORT_VAR (const int FARDATA) png_pass_height[7]; |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 389 | */ |
Glenn Randers-Pehrson | 5379b24 | 1999-11-27 10:22:33 -0600 | [diff] [blame] | 390 | #endif |
Glenn Randers-Pehrson | 5c6aeb2 | 1998-12-29 11:47:59 -0600 | [diff] [blame] | 391 | |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 392 | #endif /* PNG_NO_EXTERN */ |
| 393 | |
| 394 | /* Three color definitions. The order of the red, green, and blue, (and the |
| 395 | * exact size) is not important, although the size of the fields need to |
| 396 | * be png_byte or png_uint_16 (as defined below). |
| 397 | */ |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 398 | typedef struct png_color_struct |
| 399 | { |
Guy Schalnat | 4ee97b0 | 1996-01-16 01:51:56 -0600 | [diff] [blame] | 400 | png_byte red; |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 401 | png_byte green; |
| 402 | png_byte blue; |
| 403 | } png_color; |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 404 | typedef png_color FAR * png_colorp; |
| 405 | typedef png_color FAR * FAR * png_colorpp; |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 406 | |
| 407 | typedef struct png_color_16_struct |
| 408 | { |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 409 | png_byte index; /* used for palette files */ |
| 410 | png_uint_16 red; /* for use in red green blue files */ |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 411 | png_uint_16 green; |
| 412 | png_uint_16 blue; |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 413 | png_uint_16 gray; /* for use in grayscale files */ |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 414 | } png_color_16; |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 415 | typedef png_color_16 FAR * png_color_16p; |
| 416 | typedef png_color_16 FAR * FAR * png_color_16pp; |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 417 | |
| 418 | typedef struct png_color_8_struct |
| 419 | { |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 420 | png_byte red; /* for use in red green blue files */ |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 421 | png_byte green; |
| 422 | png_byte blue; |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 423 | png_byte gray; /* for use in grayscale files */ |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 424 | png_byte alpha; /* for alpha channel files */ |
| 425 | } png_color_8; |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 426 | typedef png_color_8 FAR * png_color_8p; |
| 427 | typedef png_color_8 FAR * FAR * png_color_8pp; |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 428 | |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame] | 429 | /* |
| 430 | * The following two structures are used for the in-core representation |
| 431 | * of sPLT chunks. |
| 432 | */ |
Glenn Randers-Pehrson | 520a764 | 2000-03-21 05:13:06 -0600 | [diff] [blame] | 433 | typedef struct png_sPLT_entry_struct |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame] | 434 | { |
| 435 | png_uint_16 red; |
| 436 | png_uint_16 green; |
| 437 | png_uint_16 blue; |
| 438 | png_uint_16 alpha; |
| 439 | png_uint_16 frequency; |
Glenn Randers-Pehrson | 520a764 | 2000-03-21 05:13:06 -0600 | [diff] [blame] | 440 | } png_sPLT_entry; |
| 441 | typedef png_sPLT_entry FAR * png_sPLT_entryp; |
| 442 | typedef png_sPLT_entry FAR * FAR * png_sPLT_entrypp; |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame] | 443 | |
Glenn Randers-Pehrson | 4accabb | 2000-04-14 14:20:47 -0500 | [diff] [blame] | 444 | /* When the depth of the sPLT palette is 8 bits, the color and alpha samples |
| 445 | * occupy the LSB of their respective members, and the MSB of each member |
| 446 | * is zero-filled. The frequency member always occupies the full 16 bits. |
| 447 | */ |
| 448 | |
Glenn Randers-Pehrson | 520a764 | 2000-03-21 05:13:06 -0600 | [diff] [blame] | 449 | typedef struct png_sPLT_struct |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame] | 450 | { |
Glenn Randers-Pehrson | 4accabb | 2000-04-14 14:20:47 -0500 | [diff] [blame] | 451 | png_charp name; /* palette name */ |
| 452 | png_byte depth; /* depth of palette samples */ |
| 453 | png_sPLT_entryp entries; /* palette entries */ |
| 454 | png_int_32 nentries; /* number of palette entries */ |
Glenn Randers-Pehrson | 520a764 | 2000-03-21 05:13:06 -0600 | [diff] [blame] | 455 | } png_sPLT_t; |
| 456 | typedef png_sPLT_t FAR * png_sPLT_tp; |
| 457 | typedef png_sPLT_t FAR * FAR * png_sPLT_tpp; |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame] | 458 | |
| 459 | #ifdef PNG_TEXT_SUPPORTED |
Glenn Randers-Pehrson | 61c32d9 | 2000-02-04 23:40:16 -0600 | [diff] [blame] | 460 | /* png_text holds the contents of a text/ztxt/itxt chunk in a PNG file, |
| 461 | * and whether that contents is compressed or not. The "key" field |
Glenn Randers-Pehrson | 4accabb | 2000-04-14 14:20:47 -0500 | [diff] [blame] | 462 | * points to a regular zero-terminated C string. The "text", "lang", and |
| 463 | * "lang_key" fields can be regular C strings, empty strings, or NULL pointers. |
| 464 | * However, the * structure returned by png_get_text() will always contain |
| 465 | * regular zero-terminated C strings (possibly empty), never NULL pointers, |
| 466 | * so they can be safely used in printf() and other string-handling functions. |
| 467 | */ |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 468 | typedef struct png_text_struct |
| 469 | { |
Glenn Randers-Pehrson | 4accabb | 2000-04-14 14:20:47 -0500 | [diff] [blame] | 470 | int compression; /* compression value: |
| 471 | -1: tEXt, none |
| 472 | 0: zTXt, deflate |
| 473 | 1: iTXt, none |
| 474 | 2: iTXt, deflate */ |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 475 | png_charp key; /* keyword, 1-79 character description of "text" */ |
Glenn Randers-Pehrson | 4accabb | 2000-04-14 14:20:47 -0500 | [diff] [blame] | 476 | png_charp text; /* comment, may be an empty string (ie "") |
| 477 | or a NULL pointer */ |
Glenn Randers-Pehrson | 61c32d9 | 2000-02-04 23:40:16 -0600 | [diff] [blame] | 478 | png_size_t text_length; /* length of the text string */ |
Glenn Randers-Pehrson | 7529457 | 2000-05-06 14:09:57 -0500 | [diff] [blame] | 479 | #ifdef PNG_iTXt_SUPPORTED |
Glenn Randers-Pehrson | 61c32d9 | 2000-02-04 23:40:16 -0600 | [diff] [blame] | 480 | png_size_t itxt_length; /* length of the itxt string */ |
Glenn Randers-Pehrson | 4accabb | 2000-04-14 14:20:47 -0500 | [diff] [blame] | 481 | png_charp lang; /* language code, 0-79 characters |
| 482 | or a NULL pointer */ |
Glenn Randers-Pehrson | 61c32d9 | 2000-02-04 23:40:16 -0600 | [diff] [blame] | 483 | png_charp lang_key; /* keyword translated UTF-8 string, 0 or more |
Glenn Randers-Pehrson | 4accabb | 2000-04-14 14:20:47 -0500 | [diff] [blame] | 484 | chars or a NULL pointer */ |
Glenn Randers-Pehrson | 7529457 | 2000-05-06 14:09:57 -0500 | [diff] [blame] | 485 | #endif |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 486 | } png_text; |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 487 | typedef png_text FAR * png_textp; |
| 488 | typedef png_text FAR * FAR * png_textpp; |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame] | 489 | #endif |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 490 | |
| 491 | /* Supported compression types for text in PNG files (tEXt, and zTXt). |
| 492 | * The values of the PNG_TEXT_COMPRESSION_ defines should NOT be changed. */ |
| 493 | #define PNG_TEXT_COMPRESSION_NONE_WR -3 |
| 494 | #define PNG_TEXT_COMPRESSION_zTXt_WR -2 |
| 495 | #define PNG_TEXT_COMPRESSION_NONE -1 |
| 496 | #define PNG_TEXT_COMPRESSION_zTXt 0 |
Glenn Randers-Pehrson | 61c32d9 | 2000-02-04 23:40:16 -0600 | [diff] [blame] | 497 | #define PNG_ITXT_COMPRESSION_NONE 1 |
| 498 | #define PNG_ITXT_COMPRESSION_zTXt 2 |
| 499 | #define PNG_TEXT_COMPRESSION_LAST 3 /* Not a valid value */ |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 500 | |
| 501 | /* png_time is a way to hold the time in an machine independent way. |
Glenn Randers-Pehrson | b6ce43d | 1998-01-01 07:13:13 -0600 | [diff] [blame] | 502 | * Two conversions are provided, both from time_t and struct tm. There |
| 503 | * is no portable way to convert to either of these structures, as far |
| 504 | * as I know. If you know of a portable way, send it to me. As a side |
Glenn Randers-Pehrson | 231e687 | 2001-01-12 15:13:06 -0600 | [diff] [blame] | 505 | * note - PNG has always been Year 2000 compliant! |
Glenn Randers-Pehrson | b6ce43d | 1998-01-01 07:13:13 -0600 | [diff] [blame] | 506 | */ |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 507 | typedef struct png_time_struct |
| 508 | { |
| 509 | png_uint_16 year; /* full year, as in, 1995 */ |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 510 | png_byte month; /* month of year, 1 - 12 */ |
| 511 | png_byte day; /* day of month, 1 - 31 */ |
| 512 | png_byte hour; /* hour of day, 0 - 23 */ |
| 513 | png_byte minute; /* minute of hour, 0 - 59 */ |
| 514 | png_byte second; /* second of minute, 0 - 60 (for leap seconds) */ |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 515 | } png_time; |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 516 | typedef png_time FAR * png_timep; |
| 517 | typedef png_time FAR * FAR * png_timepp; |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 518 | |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame] | 519 | #if defined(PNG_UNKNOWN_CHUNKS_SUPPORTED) |
| 520 | /* png_unknown_chunk is a structure to hold queued chunks for which there is |
| 521 | * no specific support. The idea is that we can use this to queue |
| 522 | * up private chunks for output even though the library doesn't actually |
| 523 | * know about their semantics. |
| 524 | */ |
| 525 | typedef struct png_unknown_chunk_t |
| 526 | { |
| 527 | png_byte name[5]; |
| 528 | png_byte *data; |
| 529 | png_size_t size; |
| 530 | |
Glenn Randers-Pehrson | 61c32d9 | 2000-02-04 23:40:16 -0600 | [diff] [blame] | 531 | /* libpng-using applications should NOT directly modify this byte. */ |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame] | 532 | png_byte location; /* mode of operation at read time */ |
| 533 | } |
| 534 | png_unknown_chunk; |
| 535 | typedef png_unknown_chunk FAR * png_unknown_chunkp; |
| 536 | typedef png_unknown_chunk FAR * FAR * png_unknown_chunkpp; |
| 537 | #endif |
| 538 | |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 539 | /* png_info is a structure that holds the information in a PNG file so |
| 540 | * that the application can find out the characteristics of the image. |
| 541 | * If you are reading the file, this structure will tell you what is |
| 542 | * in the PNG file. If you are writing the file, fill in the information |
| 543 | * you want to put into the PNG file, then call png_write_info(). |
| 544 | * The names chosen should be very close to the PNG specification, so |
| 545 | * consult that document for information about the meaning of each field. |
| 546 | * |
| 547 | * With libpng < 0.95, it was only possible to directly set and read the |
| 548 | * the values in the png_info_struct, which meant that the contents and |
| 549 | * order of the values had to remain fixed. With libpng 0.95 and later, |
Glenn Randers-Pehrson | 8686fff | 1998-05-21 09:27:50 -0500 | [diff] [blame] | 550 | * however, there are now functions that abstract the contents of |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 551 | * png_info_struct from the application, so this makes it easier to use |
| 552 | * libpng with dynamic libraries, and even makes it possible to use |
| 553 | * libraries that don't have all of the libpng ancillary chunk-handing |
| 554 | * functionality. |
| 555 | * |
| 556 | * In any case, the order of the parameters in png_info_struct should NOT |
| 557 | * be changed for as long as possible to keep compatibility with applications |
| 558 | * that use the old direct-access method with png_info_struct. |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame] | 559 | * |
| 560 | * The following members may have allocated storage attached that should be |
Glenn Randers-Pehrson | 61c32d9 | 2000-02-04 23:40:16 -0600 | [diff] [blame] | 561 | * cleaned up before the structure is discarded: palette, trans, text, |
| 562 | * pcal_purpose, pcal_units, pcal_params, hist, iccp_name, iccp_profile, |
Glenn Randers-Pehrson | 76e5fd6 | 2000-12-28 07:50:05 -0600 | [diff] [blame] | 563 | * splt_palettes, scal_unit, row_pointers, and unknowns. By default, these |
| 564 | * are automatically freed when the info structure is deallocated, if they were |
Glenn Randers-Pehrson | 38e6e77 | 2000-04-09 19:06:13 -0500 | [diff] [blame] | 565 | * allocated internally by libpng. This behavior can be changed by means |
| 566 | * of the png_data_freer() function. |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame] | 567 | * |
Glenn Randers-Pehrson | 76e5fd6 | 2000-12-28 07:50:05 -0600 | [diff] [blame] | 568 | * More allocation details: all the chunk-reading functions that |
| 569 | * change these members go through the corresponding png_set_* |
| 570 | * functions. A function to clear these members is available: see |
| 571 | * png_free_data(). The png_set_* functions do not depend on being |
| 572 | * able to point info structure members to any of the storage they are |
| 573 | * passed (they make their own copies), EXCEPT that the png_set_text |
| 574 | * functions use the same storage passed to them in the text_ptr or |
| 575 | * itxt_ptr structure argument, and the png_set_rows and png_set_unknowns |
| 576 | * functions do not make their own copies. |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 577 | */ |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 578 | typedef struct png_info_struct |
| 579 | { |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 580 | /* the following are necessary for every PNG file */ |
| 581 | png_uint_32 width; /* width of image in pixels (from IHDR) */ |
| 582 | png_uint_32 height; /* height of image in pixels (from IHDR) */ |
| 583 | png_uint_32 valid; /* valid chunk data (see PNG_INFO_ below) */ |
Glenn Randers-Pehrson | 0f881d6 | 1998-02-07 10:20:57 -0600 | [diff] [blame] | 584 | png_uint_32 rowbytes; /* bytes needed to hold an untransformed row */ |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 585 | png_colorp palette; /* array of color values (valid & PNG_INFO_PLTE) */ |
| 586 | png_uint_16 num_palette; /* number of color entries in "palette" (PLTE) */ |
| 587 | png_uint_16 num_trans; /* number of transparent palette color (tRNS) */ |
| 588 | png_byte bit_depth; /* 1, 2, 4, 8, or 16 bits/channel (from IHDR) */ |
| 589 | png_byte color_type; /* see PNG_COLOR_TYPE_ below (from IHDR) */ |
Glenn Randers-Pehrson | 5e5c1e1 | 2000-11-10 12:26:19 -0600 | [diff] [blame] | 590 | /* The following three should have been named *_method not *_type */ |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 591 | png_byte compression_type; /* must be PNG_COMPRESSION_TYPE_BASE (IHDR) */ |
| 592 | png_byte filter_type; /* must be PNG_FILTER_TYPE_BASE (from IHDR) */ |
| 593 | png_byte interlace_type; /* One of PNG_INTERLACE_NONE, PNG_INTERLACE_ADAM7 */ |
Guy Schalnat | 51f0eb4 | 1995-09-26 05:22:39 -0500 | [diff] [blame] | 594 | |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 595 | /* The following is informational only on read, and not used on writes. */ |
Glenn Randers-Pehrson | a77ef62 | 2000-02-18 13:48:52 -0600 | [diff] [blame] | 596 | png_byte channels; /* number of data channels per pixel (1, 2, 3, 4)*/ |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 597 | png_byte pixel_depth; /* number of bits per pixel */ |
| 598 | png_byte spare_byte; /* to align the data, and for future use */ |
| 599 | png_byte signature[8]; /* magic bytes read by libpng from start of file */ |
| 600 | |
| 601 | /* The rest of the data is optional. If you are reading, check the |
| 602 | * valid field to see if the information in these are valid. If you |
| 603 | * are writing, set the valid field to those chunks you want written, |
| 604 | * and initialize the appropriate fields below. |
| 605 | */ |
| 606 | |
Glenn Randers-Pehrson | 6942d53 | 2000-05-01 09:31:54 -0500 | [diff] [blame] | 607 | #if defined(PNG_gAMA_SUPPORTED) && defined(PNG_FLOATING_POINT_SUPPORTED) |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 608 | /* The gAMA chunk describes the gamma characteristics of the system |
| 609 | * on which the image was created, normally in the range [1.0, 2.5]. |
| 610 | * Data is valid if (valid & PNG_INFO_gAMA) is non-zero. |
| 611 | */ |
| 612 | float gamma; /* gamma value of image, if (valid & PNG_INFO_gAMA) */ |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame] | 613 | #endif |
Glenn Randers-Pehrson | b6ce43d | 1998-01-01 07:13:13 -0600 | [diff] [blame] | 614 | |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame] | 615 | #if defined(PNG_sRGB_SUPPORTED) |
Glenn Randers-Pehrson | b6ce43d | 1998-01-01 07:13:13 -0600 | [diff] [blame] | 616 | /* GR-P, 0.96a */ |
| 617 | /* Data valid if (valid & PNG_INFO_sRGB) non-zero. */ |
| 618 | png_byte srgb_intent; /* sRGB rendering intent [0, 1, 2, or 3] */ |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame] | 619 | #endif |
Glenn Randers-Pehrson | b6ce43d | 1998-01-01 07:13:13 -0600 | [diff] [blame] | 620 | |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame] | 621 | #if defined(PNG_TEXT_SUPPORTED) |
| 622 | /* The tEXt, and zTXt chunks contain human-readable textual data in |
| 623 | * uncompressed, compressed, and optionally compressed forms, respectively. |
| 624 | * The data in "text" is an array of pointers to uncompressed, |
| 625 | * null-terminated C strings. Each chunk has a keyword that describes the |
| 626 | * textual data contained in that chunk. Keywords are not required to be |
| 627 | * unique, and the text string may be empty. Any number of text chunks may |
| 628 | * be in an image. |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 629 | */ |
| 630 | int num_text; /* number of comments read/to write */ |
| 631 | int max_text; /* current size of text array */ |
| 632 | png_textp text; /* array of comments read/to write */ |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame] | 633 | #endif /* PNG_TEXT_SUPPORTED */ |
| 634 | |
| 635 | #if defined(PNG_tIME_SUPPORTED) |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 636 | /* The tIME chunk holds the last time the displayed image data was |
| 637 | * modified. See the png_time struct for the contents of this struct. |
| 638 | */ |
| 639 | png_time mod_time; |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame] | 640 | #endif |
| 641 | |
| 642 | #if defined(PNG_sBIT_SUPPORTED) |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 643 | /* The sBIT chunk specifies the number of significant high-order bits |
| 644 | * in the pixel data. Values are in the range [1, bit_depth], and are |
| 645 | * only specified for the channels in the pixel data. The contents of |
| 646 | * the low-order bits is not specified. Data is valid if |
| 647 | * (valid & PNG_INFO_sBIT) is non-zero. |
| 648 | */ |
| 649 | png_color_8 sig_bit; /* significant bits in color channels */ |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame] | 650 | #endif |
| 651 | |
| 652 | #if defined(PNG_tRNS_SUPPORTED) || defined(PNG_READ_EXPAND_SUPPORTED) || \ |
| 653 | defined(PNG_READ_BACKGROUND_SUPPORTED) |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 654 | /* The tRNS chunk supplies transparency data for paletted images and |
| 655 | * other image types that don't need a full alpha channel. There are |
| 656 | * "num_trans" transparency values for a paletted image, stored in the |
| 657 | * same order as the palette colors, starting from index 0. Values |
| 658 | * for the data are in the range [0, 255], ranging from fully transparent |
| 659 | * to fully opaque, respectively. For non-paletted images, there is a |
Glenn Randers-Pehrson | 8686fff | 1998-05-21 09:27:50 -0500 | [diff] [blame] | 660 | * single color specified that should be treated as fully transparent. |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 661 | * Data is valid if (valid & PNG_INFO_tRNS) is non-zero. |
| 662 | */ |
| 663 | png_bytep trans; /* transparent values for paletted image */ |
| 664 | png_color_16 trans_values; /* transparent color for non-palette image */ |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame] | 665 | #endif |
| 666 | |
| 667 | #if defined(PNG_bKGD_SUPPORTED) || defined(PNG_READ_BACKGROUND_SUPPORTED) |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 668 | /* The bKGD chunk gives the suggested image background color if the |
| 669 | * display program does not have its own background color and the image |
| 670 | * is needs to composited onto a background before display. The colors |
| 671 | * in "background" are normally in the same color space/depth as the |
| 672 | * pixel data. Data is valid if (valid & PNG_INFO_bKGD) is non-zero. |
| 673 | */ |
| 674 | png_color_16 background; |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame] | 675 | #endif |
| 676 | |
| 677 | #if defined(PNG_oFFs_SUPPORTED) |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 678 | /* The oFFs chunk gives the offset in "offset_unit_type" units rightwards |
| 679 | * and downwards from the top-left corner of the display, page, or other |
| 680 | * application-specific co-ordinate space. See the PNG_OFFSET_ defines |
| 681 | * below for the unit types. Valid if (valid & PNG_INFO_oFFs) non-zero. |
| 682 | */ |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame] | 683 | png_int_32 x_offset; /* x offset on page */ |
| 684 | png_int_32 y_offset; /* y offset on page */ |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 685 | png_byte offset_unit_type; /* offset units type */ |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame] | 686 | #endif |
| 687 | |
| 688 | #if defined(PNG_pHYs_SUPPORTED) |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 689 | /* The pHYs chunk gives the physical pixel density of the image for |
| 690 | * display or printing in "phys_unit_type" units (see PNG_RESOLUTION_ |
| 691 | * defines below). Data is valid if (valid & PNG_INFO_pHYs) is non-zero. |
| 692 | */ |
| 693 | png_uint_32 x_pixels_per_unit; /* horizontal pixel density */ |
| 694 | png_uint_32 y_pixels_per_unit; /* vertical pixel density */ |
| 695 | png_byte phys_unit_type; /* resolution type (see PNG_RESOLUTION_ below) */ |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame] | 696 | #endif |
| 697 | |
| 698 | #if defined(PNG_hIST_SUPPORTED) |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 699 | /* The hIST chunk contains the relative frequency or importance of the |
| 700 | * various palette entries, so that a viewer can intelligently select a |
| 701 | * reduced-color palette, if required. Data is an array of "num_palette" |
| 702 | * values in the range [0,65535]. Data valid if (valid & PNG_INFO_hIST) |
| 703 | * is non-zero. |
| 704 | */ |
| 705 | png_uint_16p hist; |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame] | 706 | #endif |
| 707 | |
Glenn Randers-Pehrson | 6942d53 | 2000-05-01 09:31:54 -0500 | [diff] [blame] | 708 | #ifdef PNG_cHRM_SUPPORTED |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 709 | /* The cHRM chunk describes the CIE color characteristics of the monitor |
| 710 | * on which the PNG was created. This data allows the viewer to do gamut |
| 711 | * mapping of the input image to ensure that the viewer sees the same |
| 712 | * colors in the image as the creator. Values are in the range |
| 713 | * [0.0, 0.8]. Data valid if (valid & PNG_INFO_cHRM) non-zero. |
| 714 | */ |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame] | 715 | #ifdef PNG_FLOATING_POINT_SUPPORTED |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 716 | float x_white; |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 717 | float y_white; |
| 718 | float x_red; |
| 719 | float y_red; |
| 720 | float x_green; |
| 721 | float y_green; |
| 722 | float x_blue; |
| 723 | float y_blue; |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame] | 724 | #endif |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame] | 725 | #endif |
| 726 | |
| 727 | #if defined(PNG_pCAL_SUPPORTED) |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 728 | /* The pCAL chunk describes a transformation between the stored pixel |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame] | 729 | * values and original physical data values used to create the image. |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 730 | * The integer range [0, 2^bit_depth - 1] maps to the floating-point |
| 731 | * range given by [pcal_X0, pcal_X1], and are further transformed by a |
| 732 | * (possibly non-linear) transformation function given by "pcal_type" |
| 733 | * and "pcal_params" into "pcal_units". Please see the PNG_EQUATION_ |
Glenn Randers-Pehrson | ff9c947 | 2000-07-11 07:12:36 -0500 | [diff] [blame] | 734 | * defines below, and the PNG-Group's PNG extensions document for a |
| 735 | * complete description of the transformations and how they should be |
| 736 | * implemented, and for a description of the ASCII parameter strings. |
| 737 | * Data values are valid if (valid & PNG_INFO_pCAL) non-zero. |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 738 | */ |
| 739 | png_charp pcal_purpose; /* pCAL chunk description string */ |
| 740 | png_int_32 pcal_X0; /* minimum value */ |
| 741 | png_int_32 pcal_X1; /* maximum value */ |
| 742 | png_charp pcal_units; /* Latin-1 string giving physical units */ |
| 743 | png_charpp pcal_params; /* ASCII strings containing parameter values */ |
| 744 | png_byte pcal_type; /* equation type (see PNG_EQUATION_ below) */ |
| 745 | png_byte pcal_nparams; /* number of parameters given in pcal_params */ |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame] | 746 | #endif |
| 747 | |
Glenn Randers-Pehrson | 8b6a889 | 2001-05-18 04:54:50 -0500 | [diff] [blame] | 748 | /* New members added in libpng-1.0.6 */ |
Glenn Randers-Pehrson | 6942d53 | 2000-05-01 09:31:54 -0500 | [diff] [blame] | 749 | #ifdef PNG_FREE_ME_SUPPORTED |
| 750 | png_uint_32 free_me; /* flags items libpng is responsible for freeing */ |
| 751 | #endif |
| 752 | |
| 753 | #if defined(PNG_UNKNOWN_CHUNKS_SUPPORTED) |
| 754 | /* storage for unknown chunks that the library doesn't recognize. */ |
| 755 | png_unknown_chunkp unknown_chunks; |
| 756 | png_size_t unknown_chunks_num; |
| 757 | #endif |
| 758 | |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame] | 759 | #if defined(PNG_iCCP_SUPPORTED) |
| 760 | /* iCCP chunk data. */ |
| 761 | png_charp iccp_name; /* profile name */ |
| 762 | png_charp iccp_profile; /* International Color Consortium profile data */ |
Glenn Randers-Pehrson | 2ad31ae | 2000-12-15 08:54:42 -0600 | [diff] [blame] | 763 | /* Note to maintainer: should be png_bytep */ |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame] | 764 | png_uint_32 iccp_proflen; /* ICC profile data length */ |
| 765 | png_byte iccp_compression; /* Always zero */ |
| 766 | #endif |
| 767 | |
| 768 | #if defined(PNG_sPLT_SUPPORTED) |
| 769 | /* data on sPLT chunks (there may be more than one). */ |
Glenn Randers-Pehrson | 520a764 | 2000-03-21 05:13:06 -0600 | [diff] [blame] | 770 | png_sPLT_tp splt_palettes; |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame] | 771 | png_uint_32 splt_palettes_num; |
| 772 | #endif |
| 773 | |
| 774 | #if defined(PNG_sCAL_SUPPORTED) |
| 775 | /* The sCAL chunk describes the actual physical dimensions of the |
| 776 | * subject matter of the graphic. The chunk contains a unit specification |
Glenn Randers-Pehrson | 61c32d9 | 2000-02-04 23:40:16 -0600 | [diff] [blame] | 777 | * a byte value, and two ASCII strings representing floating-point |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame] | 778 | * values. The values are width and height corresponsing to one pixel |
| 779 | * in the image. This external representation is converted to double |
| 780 | * here. Data values are valid if (valid & PNG_INFO_sCAL) is non-zero. |
| 781 | */ |
Glenn Randers-Pehrson | 61c32d9 | 2000-02-04 23:40:16 -0600 | [diff] [blame] | 782 | png_byte scal_unit; /* unit of physical scale */ |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame] | 783 | #ifdef PNG_FLOATING_POINT_SUPPORTED |
| 784 | double scal_pixel_width; /* width of one pixel */ |
| 785 | double scal_pixel_height; /* height of one pixel */ |
Glenn Randers-Pehrson | 68ea243 | 2000-04-01 21:10:05 -0600 | [diff] [blame] | 786 | #endif |
Glenn Randers-Pehrson | 61c32d9 | 2000-02-04 23:40:16 -0600 | [diff] [blame] | 787 | #ifdef PNG_FIXED_POINT_SUPPORTED |
| 788 | png_charp scal_s_width; /* string containing height */ |
| 789 | png_charp scal_s_height; /* string containing width */ |
| 790 | #endif |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame] | 791 | #endif |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame] | 792 | |
Glenn Randers-Pehrson | 61c32d9 | 2000-02-04 23:40:16 -0600 | [diff] [blame] | 793 | #if defined(PNG_INFO_IMAGE_SUPPORTED) |
Glenn Randers-Pehrson | a77ef62 | 2000-02-18 13:48:52 -0600 | [diff] [blame] | 794 | /* Memory has been allocated if (valid & PNG_ALLOCATED_INFO_ROWS) non-zero */ |
Glenn Randers-Pehrson | 61c32d9 | 2000-02-04 23:40:16 -0600 | [diff] [blame] | 795 | /* Data valid if (valid & PNG_INFO_IDAT) non-zero */ |
| 796 | png_bytepp row_pointers; /* the image bits */ |
| 797 | #endif |
Glenn Randers-Pehrson | 228bd39 | 2000-04-23 23:14:02 -0500 | [diff] [blame] | 798 | |
Glenn Randers-Pehrson | 6942d53 | 2000-05-01 09:31:54 -0500 | [diff] [blame] | 799 | #if defined(PNG_FIXED_POINT_SUPPORTED) && defined(PNG_gAMA_SUPPORTED) |
Glenn Randers-Pehrson | 228bd39 | 2000-04-23 23:14:02 -0500 | [diff] [blame] | 800 | png_fixed_point int_gamma; /* gamma of image, if (valid & PNG_INFO_gAMA) */ |
| 801 | #endif |
| 802 | |
| 803 | #if defined(PNG_cHRM_SUPPORTED) && defined(PNG_FIXED_POINT_SUPPORTED) |
| 804 | png_fixed_point int_x_white; |
| 805 | png_fixed_point int_y_white; |
| 806 | png_fixed_point int_x_red; |
| 807 | png_fixed_point int_y_red; |
| 808 | png_fixed_point int_x_green; |
| 809 | png_fixed_point int_y_green; |
| 810 | png_fixed_point int_x_blue; |
| 811 | png_fixed_point int_y_blue; |
| 812 | #endif |
| 813 | |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 814 | } png_info; |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame] | 815 | |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 816 | typedef png_info FAR * png_infop; |
| 817 | typedef png_info FAR * FAR * png_infopp; |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 818 | |
Glenn Randers-Pehrson | 4393a9a | 1999-09-17 12:27:26 -0500 | [diff] [blame] | 819 | /* Maximum positive integer used in PNG is (2^31)-1 */ |
| 820 | #define PNG_MAX_UINT ((png_uint_32)0x7fffffffL) |
| 821 | |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 822 | /* These describe the color_type field in png_info. */ |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 823 | /* color type masks */ |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 824 | #define PNG_COLOR_MASK_PALETTE 1 |
| 825 | #define PNG_COLOR_MASK_COLOR 2 |
| 826 | #define PNG_COLOR_MASK_ALPHA 4 |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 827 | |
| 828 | /* color types. Note that not all combinations are legal */ |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 829 | #define PNG_COLOR_TYPE_GRAY 0 |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 830 | #define PNG_COLOR_TYPE_PALETTE (PNG_COLOR_MASK_COLOR | PNG_COLOR_MASK_PALETTE) |
| 831 | #define PNG_COLOR_TYPE_RGB (PNG_COLOR_MASK_COLOR) |
| 832 | #define PNG_COLOR_TYPE_RGB_ALPHA (PNG_COLOR_MASK_COLOR | PNG_COLOR_MASK_ALPHA) |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 833 | #define PNG_COLOR_TYPE_GRAY_ALPHA (PNG_COLOR_MASK_ALPHA) |
Glenn Randers-Pehrson | 5e5c1e1 | 2000-11-10 12:26:19 -0600 | [diff] [blame] | 834 | /* aliases */ |
| 835 | #define PNG_COLOR_TYPE_RGBA PNG_COLOR_TYPE_RGB_ALPHA |
| 836 | #define PNG_COLOR_TYPE_GA PNG_COLOR_TYPE_GRAY_ALPHA |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 837 | |
Glenn Randers-Pehrson | 4393a9a | 1999-09-17 12:27:26 -0500 | [diff] [blame] | 838 | /* This is for compression type. PNG 1.0-1.2 only define the single type. */ |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 839 | #define PNG_COMPRESSION_TYPE_BASE 0 /* Deflate method 8, 32K window */ |
| 840 | #define PNG_COMPRESSION_TYPE_DEFAULT PNG_COMPRESSION_TYPE_BASE |
| 841 | |
Glenn Randers-Pehrson | 4393a9a | 1999-09-17 12:27:26 -0500 | [diff] [blame] | 842 | /* This is for filter type. PNG 1.0-1.2 only define the single type. */ |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 843 | #define PNG_FILTER_TYPE_BASE 0 /* Single row per-byte filtering */ |
Glenn Randers-Pehrson | 2ad31ae | 2000-12-15 08:54:42 -0600 | [diff] [blame] | 844 | #define PNG_INTRAPIXEL_DIFFERENCING 64 /* Used only in MNG datastreams */ |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 845 | #define PNG_FILTER_TYPE_DEFAULT PNG_FILTER_TYPE_BASE |
| 846 | |
| 847 | /* These are for the interlacing type. These values should NOT be changed. */ |
| 848 | #define PNG_INTERLACE_NONE 0 /* Non-interlaced image */ |
| 849 | #define PNG_INTERLACE_ADAM7 1 /* Adam7 interlacing */ |
| 850 | #define PNG_INTERLACE_LAST 2 /* Not a valid value */ |
| 851 | |
| 852 | /* These are for the oFFs chunk. These values should NOT be changed. */ |
| 853 | #define PNG_OFFSET_PIXEL 0 /* Offset in pixels */ |
| 854 | #define PNG_OFFSET_MICROMETER 1 /* Offset in micrometers (1/10^6 meter) */ |
| 855 | #define PNG_OFFSET_LAST 2 /* Not a valid value */ |
| 856 | |
| 857 | /* These are for the pCAL chunk. These values should NOT be changed. */ |
| 858 | #define PNG_EQUATION_LINEAR 0 /* Linear transformation */ |
| 859 | #define PNG_EQUATION_BASE_E 1 /* Exponential base e transform */ |
| 860 | #define PNG_EQUATION_ARBITRARY 2 /* Arbitrary base exponential transform */ |
| 861 | #define PNG_EQUATION_HYPERBOLIC 3 /* Hyperbolic sine transformation */ |
| 862 | #define PNG_EQUATION_LAST 4 /* Not a valid value */ |
| 863 | |
Glenn Randers-Pehrson | 61c32d9 | 2000-02-04 23:40:16 -0600 | [diff] [blame] | 864 | /* These are for the sCAL chunk. These values should NOT be changed. */ |
| 865 | #define PNG_SCALE_UNKNOWN 0 /* unknown unit (image scale) */ |
| 866 | #define PNG_SCALE_METER 1 /* meters per pixel */ |
| 867 | #define PNG_SCALE_RADIAN 2 /* radians per pixel */ |
| 868 | #define PNG_SCALE_LAST 3 /* Not a valid value */ |
| 869 | |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 870 | /* These are for the pHYs chunk. These values should NOT be changed. */ |
| 871 | #define PNG_RESOLUTION_UNKNOWN 0 /* pixels/unknown unit (aspect ratio) */ |
| 872 | #define PNG_RESOLUTION_METER 1 /* pixels/meter */ |
| 873 | #define PNG_RESOLUTION_LAST 2 /* Not a valid value */ |
| 874 | |
Glenn Randers-Pehrson | 46f61e2 | 1998-01-30 21:45:12 -0600 | [diff] [blame] | 875 | /* These are for the sRGB chunk. These values should NOT be changed. */ |
Glenn Randers-Pehrson | 5379b24 | 1999-11-27 10:22:33 -0600 | [diff] [blame] | 876 | #define PNG_sRGB_INTENT_PERCEPTUAL 0 |
| 877 | #define PNG_sRGB_INTENT_RELATIVE 1 |
| 878 | #define PNG_sRGB_INTENT_SATURATION 2 |
| 879 | #define PNG_sRGB_INTENT_ABSOLUTE 3 |
Glenn Randers-Pehrson | 46f61e2 | 1998-01-30 21:45:12 -0600 | [diff] [blame] | 880 | #define PNG_sRGB_INTENT_LAST 4 /* Not a valid value */ |
Glenn Randers-Pehrson | 5c6aeb2 | 1998-12-29 11:47:59 -0600 | [diff] [blame] | 881 | |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame] | 882 | /* This is for text chunks */ |
| 883 | #define PNG_KEYWORD_MAX_LENGTH 79 |
Glenn Randers-Pehrson | 46f61e2 | 1998-01-30 21:45:12 -0600 | [diff] [blame] | 884 | |
Glenn Randers-Pehrson | 76e5fd6 | 2000-12-28 07:50:05 -0600 | [diff] [blame] | 885 | /* Maximum number of entries in PLTE/sPLT/tRNS arrays */ |
| 886 | #define PNG_MAX_PALETTE_LENGTH 256 |
Glenn Randers-Pehrson | 46f61e2 | 1998-01-30 21:45:12 -0600 | [diff] [blame] | 887 | |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 888 | /* These determine if an ancillary chunk's data has been successfully read |
| 889 | * from the PNG header, or if the application has filled in the corresponding |
| 890 | * data in the info_struct to be written into the output file. The values |
| 891 | * of the PNG_INFO_<chunk> defines should NOT be changed. |
| 892 | */ |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 893 | #define PNG_INFO_gAMA 0x0001 |
| 894 | #define PNG_INFO_sBIT 0x0002 |
| 895 | #define PNG_INFO_cHRM 0x0004 |
| 896 | #define PNG_INFO_PLTE 0x0008 |
| 897 | #define PNG_INFO_tRNS 0x0010 |
| 898 | #define PNG_INFO_bKGD 0x0020 |
| 899 | #define PNG_INFO_hIST 0x0040 |
| 900 | #define PNG_INFO_pHYs 0x0080 |
| 901 | #define PNG_INFO_oFFs 0x0100 |
| 902 | #define PNG_INFO_tIME 0x0200 |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 903 | #define PNG_INFO_pCAL 0x0400 |
Glenn Randers-Pehrson | b6ce43d | 1998-01-01 07:13:13 -0600 | [diff] [blame] | 904 | #define PNG_INFO_sRGB 0x0800 /* GR-P, 0.96a */ |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame] | 905 | #define PNG_INFO_iCCP 0x1000 /* ESR, 1.0.6 */ |
| 906 | #define PNG_INFO_sPLT 0x2000 /* ESR, 1.0.6 */ |
| 907 | #define PNG_INFO_sCAL 0x4000 /* ESR, 1.0.6 */ |
Glenn Randers-Pehrson | a77ef62 | 2000-02-18 13:48:52 -0600 | [diff] [blame] | 908 | #define PNG_INFO_IDAT 0x8000L /* ESR, 1.0.6 */ |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 909 | |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 910 | /* This is used for the transformation routines, as some of them |
| 911 | * change these values for the row. It also should enable using |
| 912 | * the routines for other purposes. |
| 913 | */ |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 914 | typedef struct png_row_info_struct |
| 915 | { |
Guy Schalnat | 4ee97b0 | 1996-01-16 01:51:56 -0600 | [diff] [blame] | 916 | png_uint_32 width; /* width of row */ |
Glenn Randers-Pehrson | 0f881d6 | 1998-02-07 10:20:57 -0600 | [diff] [blame] | 917 | png_uint_32 rowbytes; /* number of bytes in row */ |
Guy Schalnat | 4ee97b0 | 1996-01-16 01:51:56 -0600 | [diff] [blame] | 918 | png_byte color_type; /* color type of row */ |
| 919 | png_byte bit_depth; /* bit depth of row */ |
| 920 | png_byte channels; /* number of channels (1, 2, 3, or 4) */ |
| 921 | png_byte pixel_depth; /* bits per pixel (depth * channels) */ |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 922 | } png_row_info; |
| 923 | |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 924 | typedef png_row_info FAR * png_row_infop; |
| 925 | typedef png_row_info FAR * FAR * png_row_infopp; |
Guy Schalnat | 0f71645 | 1995-11-28 11:22:13 -0600 | [diff] [blame] | 926 | |
Glenn Randers-Pehrson | 8686fff | 1998-05-21 09:27:50 -0500 | [diff] [blame] | 927 | /* These are the function types for the I/O functions and for the functions |
| 928 | * that allow the user to override the default I/O functions with his or her |
| 929 | * own. The png_error_ptr type should match that of user-supplied warning |
| 930 | * and error functions, while the png_rw_ptr type should match that of the |
| 931 | * user read/write data functions. |
Guy Schalnat | 0f71645 | 1995-11-28 11:22:13 -0600 | [diff] [blame] | 932 | */ |
Guy Schalnat | 6d76471 | 1995-12-19 03:22:19 -0600 | [diff] [blame] | 933 | typedef struct png_struct_def png_struct; |
| 934 | typedef png_struct FAR * png_structp; |
Guy Schalnat | 0f71645 | 1995-11-28 11:22:13 -0600 | [diff] [blame] | 935 | |
Glenn Randers-Pehrson | 7529457 | 2000-05-06 14:09:57 -0500 | [diff] [blame] | 936 | typedef void (PNGAPI *png_error_ptr) PNGARG((png_structp, png_const_charp)); |
| 937 | typedef void (PNGAPI *png_rw_ptr) PNGARG((png_structp, png_bytep, png_size_t)); |
| 938 | typedef void (PNGAPI *png_flush_ptr) PNGARG((png_structp)); |
| 939 | typedef void (PNGAPI *png_read_status_ptr) PNGARG((png_structp, png_uint_32, |
| 940 | int)); |
| 941 | typedef void (PNGAPI *png_write_status_ptr) PNGARG((png_structp, png_uint_32, |
| 942 | int)); |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame] | 943 | |
Guy Schalnat | 69b1448 | 1996-01-10 02:56:49 -0600 | [diff] [blame] | 944 | #ifdef PNG_PROGRESSIVE_READ_SUPPORTED |
Glenn Randers-Pehrson | 7529457 | 2000-05-06 14:09:57 -0500 | [diff] [blame] | 945 | typedef void (PNGAPI *png_progressive_info_ptr) PNGARG((png_structp, png_infop)); |
| 946 | typedef void (PNGAPI *png_progressive_end_ptr) PNGARG((png_structp, png_infop)); |
| 947 | typedef void (PNGAPI *png_progressive_row_ptr) PNGARG((png_structp, png_bytep, |
Guy Schalnat | 4ee97b0 | 1996-01-16 01:51:56 -0600 | [diff] [blame] | 948 | png_uint_32, int)); |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame] | 949 | #endif |
Guy Schalnat | 6d76471 | 1995-12-19 03:22:19 -0600 | [diff] [blame] | 950 | |
Glenn Randers-Pehrson | 08a3343 | 1998-03-07 06:06:55 -0600 | [diff] [blame] | 951 | #if defined(PNG_READ_USER_TRANSFORM_SUPPORTED) || \ |
Glenn Randers-Pehrson | 6942d53 | 2000-05-01 09:31:54 -0500 | [diff] [blame] | 952 | defined(PNG_WRITE_USER_TRANSFORM_SUPPORTED) || \ |
| 953 | defined(PNG_LEGACY_SUPPORTED) |
Glenn Randers-Pehrson | 7529457 | 2000-05-06 14:09:57 -0500 | [diff] [blame] | 954 | typedef void (PNGAPI *png_user_transform_ptr) PNGARG((png_structp, |
Glenn Randers-Pehrson | 08a3343 | 1998-03-07 06:06:55 -0600 | [diff] [blame] | 955 | png_row_infop, png_bytep)); |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame] | 956 | #endif |
Glenn Randers-Pehrson | 08a3343 | 1998-03-07 06:06:55 -0600 | [diff] [blame] | 957 | |
Glenn Randers-Pehrson | 1909560 | 2001-03-14 07:08:39 -0600 | [diff] [blame] | 958 | #if defined(PNG_USER_CHUNKS_SUPPORTED) |
Glenn Randers-Pehrson | 7529457 | 2000-05-06 14:09:57 -0500 | [diff] [blame] | 959 | typedef int (PNGAPI *png_user_chunk_ptr) PNGARG((png_structp, png_unknown_chunkp)); |
Glenn Randers-Pehrson | 61c32d9 | 2000-02-04 23:40:16 -0600 | [diff] [blame] | 960 | #endif |
Glenn Randers-Pehrson | 1909560 | 2001-03-14 07:08:39 -0600 | [diff] [blame] | 961 | #if defined(PNG_UNKNOWN_CHUNKS_SUPPORTED) |
Glenn Randers-Pehrson | 7529457 | 2000-05-06 14:09:57 -0500 | [diff] [blame] | 962 | typedef void (PNGAPI *png_unknown_chunk_ptr) PNGARG((png_structp)); |
Glenn Randers-Pehrson | 61c32d9 | 2000-02-04 23:40:16 -0600 | [diff] [blame] | 963 | #endif |
| 964 | |
| 965 | /* Transform masks for the high-level interface */ |
Glenn Randers-Pehrson | a77ef62 | 2000-02-18 13:48:52 -0600 | [diff] [blame] | 966 | #define PNG_TRANSFORM_IDENTITY 0x0000 /* read and write */ |
| 967 | #define PNG_TRANSFORM_STRIP_16 0x0001 /* read only */ |
Glenn Randers-Pehrson | 61c32d9 | 2000-02-04 23:40:16 -0600 | [diff] [blame] | 968 | #define PNG_TRANSFORM_STRIP_ALPHA 0x0002 /* read only */ |
| 969 | #define PNG_TRANSFORM_PACKING 0x0004 /* read and write */ |
Glenn Randers-Pehrson | a77ef62 | 2000-02-18 13:48:52 -0600 | [diff] [blame] | 970 | #define PNG_TRANSFORM_PACKSWAP 0x0008 /* read and write */ |
| 971 | #define PNG_TRANSFORM_EXPAND 0x0010 /* read only */ |
Glenn Randers-Pehrson | 61c32d9 | 2000-02-04 23:40:16 -0600 | [diff] [blame] | 972 | #define PNG_TRANSFORM_INVERT_MONO 0x0020 /* read and write */ |
Glenn Randers-Pehrson | a77ef62 | 2000-02-18 13:48:52 -0600 | [diff] [blame] | 973 | #define PNG_TRANSFORM_SHIFT 0x0040 /* read and write */ |
| 974 | #define PNG_TRANSFORM_BGR 0x0080 /* read and write */ |
| 975 | #define PNG_TRANSFORM_SWAP_ALPHA 0x0100 /* read and write */ |
Glenn Randers-Pehrson | 61c32d9 | 2000-02-04 23:40:16 -0600 | [diff] [blame] | 976 | #define PNG_TRANSFORM_SWAP_ENDIAN 0x0200 /* read and write */ |
Glenn Randers-Pehrson | db66d44 | 2000-06-23 21:38:16 -0500 | [diff] [blame] | 977 | #define PNG_TRANSFORM_INVERT_ALPHA 0x0400 /* read and write */ |
Glenn Randers-Pehrson | a77ef62 | 2000-02-18 13:48:52 -0600 | [diff] [blame] | 978 | #define PNG_TRANSFORM_STRIP_FILLER 0x0800 /* WRITE only */ |
Glenn Randers-Pehrson | 61c32d9 | 2000-02-04 23:40:16 -0600 | [diff] [blame] | 979 | |
Glenn Randers-Pehrson | 5e5c1e1 | 2000-11-10 12:26:19 -0600 | [diff] [blame] | 980 | /* Flags for MNG supported features */ |
Glenn Randers-Pehrson | d56aca7 | 2000-11-23 11:51:42 -0600 | [diff] [blame] | 981 | #define PNG_FLAG_MNG_EMPTY_PLTE 0x01 |
Glenn Randers-Pehrson | d56aca7 | 2000-11-23 11:51:42 -0600 | [diff] [blame] | 982 | #define PNG_FLAG_MNG_FILTER_64 0x04 |
Glenn Randers-Pehrson | 408b421 | 2000-12-18 09:33:57 -0600 | [diff] [blame] | 983 | #define PNG_ALL_MNG_FEATURES 0x05 |
Glenn Randers-Pehrson | 5e5c1e1 | 2000-11-10 12:26:19 -0600 | [diff] [blame] | 984 | |
Glenn Randers-Pehrson | f7d1a17 | 1998-06-06 15:31:35 -0500 | [diff] [blame] | 985 | typedef png_voidp (*png_malloc_ptr) PNGARG((png_structp, png_size_t)); |
Glenn Randers-Pehrson | 4393a9a | 1999-09-17 12:27:26 -0500 | [diff] [blame] | 986 | typedef void (*png_free_ptr) PNGARG((png_structp, png_voidp)); |
Glenn Randers-Pehrson | f7d1a17 | 1998-06-06 15:31:35 -0500 | [diff] [blame] | 987 | |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 988 | /* The structure that holds the information to read and write PNG files. |
| 989 | * The only people who need to care about what is inside of this are the |
| 990 | * people who will be modifying the library for their own special needs. |
| 991 | * It should NOT be accessed directly by an application, except to store |
| 992 | * the jmp_buf. |
| 993 | */ |
Guy Schalnat | 6d76471 | 1995-12-19 03:22:19 -0600 | [diff] [blame] | 994 | |
Guy Schalnat | 69b1448 | 1996-01-10 02:56:49 -0600 | [diff] [blame] | 995 | struct png_struct_def |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 996 | { |
Glenn Randers-Pehrson | 61c32d9 | 2000-02-04 23:40:16 -0600 | [diff] [blame] | 997 | #ifdef PNG_SETJMP_SUPPORTED |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 998 | jmp_buf jmpbuf; /* used in png_error */ |
Glenn Randers-Pehrson | 61c32d9 | 2000-02-04 23:40:16 -0600 | [diff] [blame] | 999 | #endif |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 1000 | png_error_ptr error_fn; /* function for printing errors and aborting */ |
| 1001 | png_error_ptr warning_fn; /* function for printing warnings */ |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 1002 | png_voidp error_ptr; /* user supplied struct for error functions */ |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 1003 | png_rw_ptr write_data_fn; /* function for writing output data */ |
| 1004 | png_rw_ptr read_data_fn; /* function for reading input data */ |
Glenn Randers-Pehrson | 4393a9a | 1999-09-17 12:27:26 -0500 | [diff] [blame] | 1005 | png_voidp io_ptr; /* ptr to application struct for I/O functions*/ |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame] | 1006 | |
Glenn Randers-Pehrson | 4393a9a | 1999-09-17 12:27:26 -0500 | [diff] [blame] | 1007 | #if defined(PNG_READ_USER_TRANSFORM_SUPPORTED) |
Glenn Randers-Pehrson | 08a3343 | 1998-03-07 06:06:55 -0600 | [diff] [blame] | 1008 | png_user_transform_ptr read_user_transform_fn; /* user read transform */ |
Glenn Randers-Pehrson | 4393a9a | 1999-09-17 12:27:26 -0500 | [diff] [blame] | 1009 | #endif |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame] | 1010 | |
Glenn Randers-Pehrson | 4393a9a | 1999-09-17 12:27:26 -0500 | [diff] [blame] | 1011 | #if defined(PNG_WRITE_USER_TRANSFORM_SUPPORTED) |
Glenn Randers-Pehrson | 08a3343 | 1998-03-07 06:06:55 -0600 | [diff] [blame] | 1012 | png_user_transform_ptr write_user_transform_fn; /* user write transform */ |
| 1013 | #endif |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame] | 1014 | |
Glenn Randers-Pehrson | 6942d53 | 2000-05-01 09:31:54 -0500 | [diff] [blame] | 1015 | /* These were added in libpng-1.0.2 */ |
| 1016 | #if defined(PNG_USER_TRANSFORM_PTR_SUPPORTED) |
Glenn Randers-Pehrson | 4393a9a | 1999-09-17 12:27:26 -0500 | [diff] [blame] | 1017 | #if defined(PNG_READ_USER_TRANSFORM_SUPPORTED) || \ |
| 1018 | defined(PNG_WRITE_USER_TRANSFORM_SUPPORTED) |
| 1019 | png_voidp user_transform_ptr; /* user supplied struct for user transform */ |
Glenn Randers-Pehrson | ab1e583 | 1999-10-06 04:57:42 -0500 | [diff] [blame] | 1020 | png_byte user_transform_depth; /* bit depth of user transformed pixels */ |
| 1021 | png_byte user_transform_channels; /* channels in user transformed pixels */ |
Glenn Randers-Pehrson | 4393a9a | 1999-09-17 12:27:26 -0500 | [diff] [blame] | 1022 | #endif |
Glenn Randers-Pehrson | 6942d53 | 2000-05-01 09:31:54 -0500 | [diff] [blame] | 1023 | #endif |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 1024 | |
Glenn Randers-Pehrson | 08a3343 | 1998-03-07 06:06:55 -0600 | [diff] [blame] | 1025 | png_uint_32 mode; /* tells us where we are in the PNG file */ |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 1026 | png_uint_32 flags; /* flags indicating various things to libpng */ |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 1027 | png_uint_32 transformations; /* which transformations to perform */ |
| 1028 | |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 1029 | z_stream zstream; /* pointer to decompression structure (below) */ |
| 1030 | png_bytep zbuf; /* buffer for zlib */ |
| 1031 | png_size_t zbuf_size; /* size of zbuf */ |
| 1032 | int zlib_level; /* holds zlib compression level */ |
| 1033 | int zlib_method; /* holds zlib compression method */ |
| 1034 | int zlib_window_bits; /* holds zlib compression window bits */ |
| 1035 | int zlib_mem_level; /* holds zlib compression memory level */ |
| 1036 | int zlib_strategy; /* holds zlib compression strategy */ |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 1037 | |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 1038 | png_uint_32 width; /* width of image in pixels */ |
| 1039 | png_uint_32 height; /* height of image in pixels */ |
| 1040 | png_uint_32 num_rows; /* number of rows in current pass */ |
| 1041 | png_uint_32 usr_width; /* width of row at start of write */ |
Glenn Randers-Pehrson | 0f881d6 | 1998-02-07 10:20:57 -0600 | [diff] [blame] | 1042 | png_uint_32 rowbytes; /* size of row in bytes */ |
| 1043 | png_uint_32 irowbytes; /* size of current interlaced row in bytes */ |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 1044 | png_uint_32 iwidth; /* width of current interlaced row in pixels */ |
| 1045 | png_uint_32 row_number; /* current row in interlace pass */ |
| 1046 | png_bytep prev_row; /* buffer to save previous (unfiltered) row */ |
| 1047 | png_bytep row_buf; /* buffer to save current (unfiltered) row */ |
| 1048 | png_bytep sub_row; /* buffer to save "sub" row when filtering */ |
| 1049 | png_bytep up_row; /* buffer to save "up" row when filtering */ |
| 1050 | png_bytep avg_row; /* buffer to save "avg" row when filtering */ |
| 1051 | png_bytep paeth_row; /* buffer to save "Paeth" row when filtering */ |
| 1052 | png_row_info row_info; /* used for transformation routines */ |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 1053 | |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 1054 | png_uint_32 idat_size; /* current IDAT size for read */ |
| 1055 | png_uint_32 crc; /* current chunk CRC value */ |
| 1056 | png_colorp palette; /* palette from the input file */ |
| 1057 | png_uint_16 num_palette; /* number of color entries in palette */ |
| 1058 | png_uint_16 num_trans; /* number of transparency values */ |
| 1059 | png_byte chunk_name[5]; /* null-terminated name of current chunk */ |
| 1060 | png_byte compression; /* file compression type (always 0) */ |
| 1061 | png_byte filter; /* file filter type (always 0) */ |
| 1062 | png_byte interlaced; /* PNG_INTERLACE_NONE, PNG_INTERLACE_ADAM7 */ |
| 1063 | png_byte pass; /* current interlace pass (0 - 6) */ |
| 1064 | png_byte do_filter; /* row filter flags (see PNG_FILTER_ below ) */ |
| 1065 | png_byte color_type; /* color type of file */ |
| 1066 | png_byte bit_depth; /* bit depth of file */ |
| 1067 | png_byte usr_bit_depth; /* bit depth of users row */ |
| 1068 | png_byte pixel_depth; /* number of bits per pixel */ |
| 1069 | png_byte channels; /* number of channels in file */ |
| 1070 | png_byte usr_channels; /* channels at start of write */ |
| 1071 | png_byte sig_bytes; /* magic bytes read/written from start of file */ |
Andreas Dilger | 02ad0ef | 1997-01-17 01:34:35 -0600 | [diff] [blame] | 1072 | |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 1073 | #if defined(PNG_READ_FILLER_SUPPORTED) || defined(PNG_WRITE_FILLER_SUPPORTED) |
Glenn Randers-Pehrson | 6942d53 | 2000-05-01 09:31:54 -0500 | [diff] [blame] | 1074 | #ifdef PNG_LEGACY_SUPPORTED |
| 1075 | png_byte filler; /* filler byte for pixel expansion */ |
| 1076 | #else |
Glenn Randers-Pehrson | 896239b | 1998-04-21 15:03:57 -0500 | [diff] [blame] | 1077 | png_uint_16 filler; /* filler bytes for pixel expansion */ |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame] | 1078 | #endif |
Glenn Randers-Pehrson | 6942d53 | 2000-05-01 09:31:54 -0500 | [diff] [blame] | 1079 | #endif |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame] | 1080 | |
Glenn Randers-Pehrson | 1909560 | 2001-03-14 07:08:39 -0600 | [diff] [blame] | 1081 | #if defined(PNG_bKGD_SUPPORTED) |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 1082 | png_byte background_gamma_type; |
Glenn Randers-Pehrson | 6942d53 | 2000-05-01 09:31:54 -0500 | [diff] [blame] | 1083 | # ifdef PNG_FLOATING_POINT_SUPPORTED |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 1084 | float background_gamma; |
Glenn Randers-Pehrson | 6942d53 | 2000-05-01 09:31:54 -0500 | [diff] [blame] | 1085 | # endif |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 1086 | png_color_16 background; /* background color in screen gamma space */ |
Glenn Randers-Pehrson | 5a0be34 | 2001-10-18 20:55:13 -0500 | [diff] [blame] | 1087 | #if defined(PNG_READ_GAMMA_SUPPORTED) |
| 1088 | png_color_16 background_1; /* background normalized to gamma 1.0 */ |
| 1089 | #endif |
Glenn Randers-Pehrson | 1909560 | 2001-03-14 07:08:39 -0600 | [diff] [blame] | 1090 | #endif /* PNG_bKGD_SUPPORTED */ |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame] | 1091 | |
Guy Schalnat | 6d76471 | 1995-12-19 03:22:19 -0600 | [diff] [blame] | 1092 | #if defined(PNG_WRITE_FLUSH_SUPPORTED) |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 1093 | png_flush_ptr output_flush_fn;/* Function for flushing output */ |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 1094 | png_uint_32 flush_dist; /* how many rows apart to flush, 0 - no flush */ |
| 1095 | png_uint_32 flush_rows; /* number of rows written since last flush */ |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame] | 1096 | #endif |
| 1097 | |
Glenn Randers-Pehrson | f7d1a17 | 1998-06-06 15:31:35 -0500 | [diff] [blame] | 1098 | #if defined(PNG_READ_GAMMA_SUPPORTED) || defined(PNG_READ_BACKGROUND_SUPPORTED) |
Glenn Randers-Pehrson | c4a2ae6 | 1998-01-16 22:06:18 -0600 | [diff] [blame] | 1099 | int gamma_shift; /* number of "insignificant" bits 16-bit gamma */ |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame] | 1100 | #ifdef PNG_FLOATING_POINT_SUPPORTED |
Glenn Randers-Pehrson | c4a2ae6 | 1998-01-16 22:06:18 -0600 | [diff] [blame] | 1101 | float gamma; /* file gamma value */ |
Glenn Randers-Pehrson | bcfd15d | 1999-10-01 14:22:25 -0500 | [diff] [blame] | 1102 | float screen_gamma; /* screen gamma value (display_exponent) */ |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame] | 1103 | #endif |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame] | 1104 | #endif |
| 1105 | |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 1106 | #if defined(PNG_READ_GAMMA_SUPPORTED) || defined(PNG_READ_BACKGROUND_SUPPORTED) |
Glenn Randers-Pehrson | 4393a9a | 1999-09-17 12:27:26 -0500 | [diff] [blame] | 1107 | png_bytep gamma_table; /* gamma table for 8-bit depth files */ |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 1108 | png_bytep gamma_from_1; /* converts from 1.0 to screen */ |
| 1109 | png_bytep gamma_to_1; /* converts from file to 1.0 */ |
Glenn Randers-Pehrson | 4393a9a | 1999-09-17 12:27:26 -0500 | [diff] [blame] | 1110 | png_uint_16pp gamma_16_table; /* gamma table for 16-bit depth files */ |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 1111 | png_uint_16pp gamma_16_from_1; /* converts from 1.0 to screen */ |
| 1112 | png_uint_16pp gamma_16_to_1; /* converts from file to 1.0 */ |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame] | 1113 | #endif |
| 1114 | |
Glenn Randers-Pehrson | 1909560 | 2001-03-14 07:08:39 -0600 | [diff] [blame] | 1115 | #if defined(PNG_READ_GAMMA_SUPPORTED) || defined(PNG_sBIT_SUPPORTED) |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 1116 | png_color_8 sig_bit; /* significant bits in each available channel */ |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame] | 1117 | #endif |
| 1118 | |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 1119 | #if defined(PNG_READ_SHIFT_SUPPORTED) || defined(PNG_WRITE_SHIFT_SUPPORTED) |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 1120 | png_color_8 shift; /* shift for significant bit tranformation */ |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame] | 1121 | #endif |
| 1122 | |
Glenn Randers-Pehrson | 1909560 | 2001-03-14 07:08:39 -0600 | [diff] [blame] | 1123 | #if defined(PNG_tRNS_SUPPORTED) || defined(PNG_READ_BACKGROUND_SUPPORTED) \ |
Glenn Randers-Pehrson | f7d1a17 | 1998-06-06 15:31:35 -0500 | [diff] [blame] | 1124 | || defined(PNG_READ_EXPAND_SUPPORTED) || defined(PNG_READ_BACKGROUND_SUPPORTED) |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 1125 | png_bytep trans; /* transparency values for paletted files */ |
| 1126 | png_color_16 trans_values; /* transparency values for non-paletted files */ |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame] | 1127 | #endif |
| 1128 | |
Glenn Randers-Pehrson | 08a3343 | 1998-03-07 06:06:55 -0600 | [diff] [blame] | 1129 | png_read_status_ptr read_row_fn; /* called after each row is decoded */ |
| 1130 | png_write_status_ptr write_row_fn; /* called after each row is encoded */ |
Guy Schalnat | 6d76471 | 1995-12-19 03:22:19 -0600 | [diff] [blame] | 1131 | #ifdef PNG_PROGRESSIVE_READ_SUPPORTED |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 1132 | png_progressive_info_ptr info_fn; /* called after header data fully read */ |
Glenn Randers-Pehrson | 08a3343 | 1998-03-07 06:06:55 -0600 | [diff] [blame] | 1133 | png_progressive_row_ptr row_fn; /* called after each prog. row is decoded */ |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 1134 | png_progressive_end_ptr end_fn; /* called after image is complete */ |
| 1135 | png_bytep save_buffer_ptr; /* current location in save_buffer */ |
| 1136 | png_bytep save_buffer; /* buffer for previously read data */ |
| 1137 | png_bytep current_buffer_ptr; /* current location in current_buffer */ |
| 1138 | png_bytep current_buffer; /* buffer for recently used data */ |
| 1139 | png_uint_32 push_length; /* size of current input chunk */ |
| 1140 | png_uint_32 skip_length; /* bytes to skip in input data */ |
| 1141 | png_size_t save_buffer_size; /* amount of data now in save_buffer */ |
| 1142 | png_size_t save_buffer_max; /* total size of save_buffer */ |
| 1143 | png_size_t buffer_size; /* total amount of available input data */ |
| 1144 | png_size_t current_buffer_size; /* amount of data now in current_buffer */ |
| 1145 | int process_mode; /* what push library is currently doing */ |
| 1146 | int cur_palette; /* current push library palette index */ |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame] | 1147 | |
Glenn Randers-Pehrson | 1909560 | 2001-03-14 07:08:39 -0600 | [diff] [blame] | 1148 | # if defined(PNG_TEXT_SUPPORTED) |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame] | 1149 | png_size_t current_text_size; /* current size of text input data */ |
| 1150 | png_size_t current_text_left; /* how much text left to read in input */ |
| 1151 | png_charp current_text; /* current text chunk buffer */ |
| 1152 | png_charp current_text_ptr; /* current location in current_text */ |
Glenn Randers-Pehrson | 1909560 | 2001-03-14 07:08:39 -0600 | [diff] [blame] | 1153 | # endif /* PNG_PROGRESSIVE_READ_SUPPORTED && PNG_TEXT_SUPPORTED */ |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame] | 1154 | |
Glenn Randers-Pehrson | c4a2ae6 | 1998-01-16 22:06:18 -0600 | [diff] [blame] | 1155 | #endif /* PNG_PROGRESSIVE_READ_SUPPORTED */ |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame] | 1156 | |
Guy Schalnat | 4ee97b0 | 1996-01-16 01:51:56 -0600 | [diff] [blame] | 1157 | #if defined(__TURBOC__) && !defined(_Windows) && !defined(__FLAT__) |
| 1158 | /* for the Borland special 64K segment handler */ |
| 1159 | png_bytepp offset_table_ptr; |
| 1160 | png_bytep offset_table; |
| 1161 | png_uint_16 offset_table_number; |
| 1162 | png_uint_16 offset_table_count; |
| 1163 | png_uint_16 offset_table_count_free; |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame] | 1164 | #endif |
| 1165 | |
Guy Schalnat | 51f0eb4 | 1995-09-26 05:22:39 -0500 | [diff] [blame] | 1166 | #if defined(PNG_READ_DITHER_SUPPORTED) |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 1167 | png_bytep palette_lookup; /* lookup table for dithering */ |
| 1168 | png_bytep dither_index; /* index translation for palette files */ |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame] | 1169 | #endif |
| 1170 | |
Glenn Randers-Pehrson | 1909560 | 2001-03-14 07:08:39 -0600 | [diff] [blame] | 1171 | #if defined(PNG_READ_DITHER_SUPPORTED) || defined(PNG_hIST_SUPPORTED) |
Glenn Randers-Pehrson | 46f61e2 | 1998-01-30 21:45:12 -0600 | [diff] [blame] | 1172 | png_uint_16p hist; /* histogram */ |
| 1173 | #endif |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame] | 1174 | |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 1175 | #if defined(PNG_WRITE_WEIGHTED_FILTER_SUPPORTED) |
| 1176 | png_byte heuristic_method; /* heuristic for row filter selection */ |
| 1177 | png_byte num_prev_filters; /* number of weights for previous rows */ |
| 1178 | png_bytep prev_filters; /* filter type(s) of previous row(s) */ |
| 1179 | png_uint_16p filter_weights; /* weight(s) for previous line(s) */ |
| 1180 | png_uint_16p inv_filter_weights; /* 1/weight(s) for previous line(s) */ |
| 1181 | png_uint_16p filter_costs; /* relative filter calculation cost */ |
| 1182 | png_uint_16p inv_filter_costs; /* 1/relative filter calculation cost */ |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame] | 1183 | #endif |
| 1184 | |
Glenn Randers-Pehrson | c4a2ae6 | 1998-01-16 22:06:18 -0600 | [diff] [blame] | 1185 | #if defined(PNG_TIME_RFC1123_SUPPORTED) |
| 1186 | png_charp time_buffer; /* String to hold RFC 1123 time text */ |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame] | 1187 | #endif |
| 1188 | |
Glenn Randers-Pehrson | 6942d53 | 2000-05-01 09:31:54 -0500 | [diff] [blame] | 1189 | /* New members added in libpng-1.0.6 */ |
| 1190 | |
| 1191 | #ifdef PNG_FREE_ME_SUPPORTED |
| 1192 | png_uint_32 free_me; /* flags items libpng is responsible for freeing */ |
| 1193 | #endif |
| 1194 | |
Glenn Randers-Pehrson | 1909560 | 2001-03-14 07:08:39 -0600 | [diff] [blame] | 1195 | #if defined(PNG_USER_CHUNKS_SUPPORTED) |
Glenn Randers-Pehrson | 6942d53 | 2000-05-01 09:31:54 -0500 | [diff] [blame] | 1196 | png_voidp user_chunk_ptr; |
| 1197 | png_user_chunk_ptr read_user_chunk_fn; /* user read chunk handler */ |
| 1198 | #endif |
| 1199 | |
| 1200 | #if defined(PNG_UNKNOWN_CHUNKS_SUPPORTED) |
| 1201 | int num_chunk_list; |
| 1202 | png_bytep chunk_list; |
| 1203 | #endif |
| 1204 | |
Glenn Randers-Pehrson | 8b6a889 | 2001-05-18 04:54:50 -0500 | [diff] [blame] | 1205 | /* New members added in libpng-1.0.3 */ |
Glenn Randers-Pehrson | 5c6aeb2 | 1998-12-29 11:47:59 -0600 | [diff] [blame] | 1206 | #if defined(PNG_READ_RGB_TO_GRAY_SUPPORTED) |
| 1207 | png_byte rgb_to_gray_status; |
Glenn Randers-Pehrson | 8b6a889 | 2001-05-18 04:54:50 -0500 | [diff] [blame] | 1208 | /* These were changed from png_byte in libpng-1.0.6 */ |
Glenn Randers-Pehrson | 520a764 | 2000-03-21 05:13:06 -0600 | [diff] [blame] | 1209 | png_uint_16 rgb_to_gray_red_coeff; |
| 1210 | png_uint_16 rgb_to_gray_green_coeff; |
| 1211 | png_uint_16 rgb_to_gray_blue_coeff; |
Glenn Randers-Pehrson | 5c6aeb2 | 1998-12-29 11:47:59 -0600 | [diff] [blame] | 1212 | #endif |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame] | 1213 | |
Glenn Randers-Pehrson | 8b6a889 | 2001-05-18 04:54:50 -0500 | [diff] [blame] | 1214 | /* New member added in libpng-1.0.4 (renamed in 1.0.9) */ |
Glenn Randers-Pehrson | 5e5c1e1 | 2000-11-10 12:26:19 -0600 | [diff] [blame] | 1215 | #if defined(PNG_MNG_FEATURES_SUPPORTED) || \ |
| 1216 | defined(PNG_READ_EMPTY_PLTE_SUPPORTED) || \ |
Glenn Randers-Pehrson | 4393a9a | 1999-09-17 12:27:26 -0500 | [diff] [blame] | 1217 | defined(PNG_WRITE_EMPTY_PLTE_SUPPORTED) |
Glenn Randers-Pehrson | 8b6a889 | 2001-05-18 04:54:50 -0500 | [diff] [blame] | 1218 | /* changed from png_byte to png_uint_32 at version 1.2.0 */ |
Glenn Randers-Pehrson | 377657d | 2002-03-08 01:31:27 -0600 | [diff] [blame] | 1219 | #ifdef PNG_1_0_X |
| 1220 | png_byte mng_features_permitted; |
| 1221 | #else |
Glenn Randers-Pehrson | 8b6a889 | 2001-05-18 04:54:50 -0500 | [diff] [blame] | 1222 | png_uint_32 mng_features_permitted; |
Glenn Randers-Pehrson | 377657d | 2002-03-08 01:31:27 -0600 | [diff] [blame] | 1223 | #endif /* PNG_1_0_X */ |
Glenn Randers-Pehrson | 4393a9a | 1999-09-17 12:27:26 -0500 | [diff] [blame] | 1224 | #endif |
Glenn Randers-Pehrson | 61c32d9 | 2000-02-04 23:40:16 -0600 | [diff] [blame] | 1225 | |
Glenn Randers-Pehrson | 8b6a889 | 2001-05-18 04:54:50 -0500 | [diff] [blame] | 1226 | /* New member added in libpng-1.0.7 */ |
Glenn Randers-Pehrson | 228bd39 | 2000-04-23 23:14:02 -0500 | [diff] [blame] | 1227 | #if defined(PNG_READ_GAMMA_SUPPORTED) || defined(PNG_READ_BACKGROUND_SUPPORTED) |
| 1228 | png_fixed_point int_gamma; |
| 1229 | #endif |
| 1230 | |
Glenn Randers-Pehrson | 8b6a889 | 2001-05-18 04:54:50 -0500 | [diff] [blame] | 1231 | /* New member added in libpng-1.0.9, ifdef'ed out in 1.0.12, enabled in 1.2.0 */ |
| 1232 | #if defined(PNG_MNG_FEATURES_SUPPORTED) |
Glenn Randers-Pehrson | 2ad31ae | 2000-12-15 08:54:42 -0600 | [diff] [blame] | 1233 | png_byte filter_type; |
Glenn Randers-Pehrson | 8b6a889 | 2001-05-18 04:54:50 -0500 | [diff] [blame] | 1234 | #endif |
Glenn Randers-Pehrson | 2ad31ae | 2000-12-15 08:54:42 -0600 | [diff] [blame] | 1235 | |
Glenn Randers-Pehrson | 377657d | 2002-03-08 01:31:27 -0600 | [diff] [blame] | 1236 | #if defined(PNG_1_0_X) || (defined(PNG_DEBUG) && defined(PNG_USE_PNGGCCRD)) |
Glenn Randers-Pehrson | 8b6a889 | 2001-05-18 04:54:50 -0500 | [diff] [blame] | 1237 | /* New member added in libpng-1.0.10, ifdef'ed out in 1.2.0 */ |
| 1238 | png_uint_32 row_buf_size; |
| 1239 | #endif |
| 1240 | |
| 1241 | /* New members added in libpng-1.2.0 */ |
Glenn Randers-Pehrson | 377657d | 2002-03-08 01:31:27 -0600 | [diff] [blame] | 1242 | #if !defined(PNG_1_0_X) && defined(PNG_ASSEMBLER_CODE_SUPPORTED) |
Glenn Randers-Pehrson | e68f5a3 | 2001-05-14 09:20:53 -0500 | [diff] [blame] | 1243 | png_byte mmx_bitdepth_threshold; |
| 1244 | png_uint_32 mmx_rowbytes_threshold; |
| 1245 | png_uint_32 asm_flags; |
| 1246 | #endif |
| 1247 | |
Glenn Randers-Pehrson | 8b6a889 | 2001-05-18 04:54:50 -0500 | [diff] [blame] | 1248 | /* New members added in libpng-1.0.2 but first enabled by default in 1.2.0 */ |
| 1249 | #ifdef PNG_USER_MEM_SUPPORTED |
| 1250 | png_voidp mem_ptr; /* user supplied struct for mem functions */ |
| 1251 | png_malloc_ptr malloc_fn; /* function for allocating memory */ |
| 1252 | png_free_ptr free_fn; /* function for freeing memory */ |
| 1253 | #endif |
Glenn Randers-Pehrson | 1909560 | 2001-03-14 07:08:39 -0600 | [diff] [blame] | 1254 | |
Glenn Randers-Pehrson | 1b8e567 | 2001-08-25 06:46:06 -0500 | [diff] [blame] | 1255 | png_bytep big_row_buf; /* buffer to save current (unfiltered) row */ |
| 1256 | |
Guy Schalnat | 0f71645 | 1995-11-28 11:22:13 -0600 | [diff] [blame] | 1257 | }; |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 1258 | |
Glenn Randers-Pehrson | 231e687 | 2001-01-12 15:13:06 -0600 | [diff] [blame] | 1259 | |
Glenn Randers-Pehrson | 73d57cb | 2002-03-25 18:49:08 -0600 | [diff] [blame] | 1260 | /* This prevents a compiler error in png.c if png.c and png.h are both at |
Glenn Randers-Pehrson | 25228ab | 2002-03-31 07:33:55 -0600 | [diff] [blame^] | 1261 | version 1.2.2beta6 |
Glenn Randers-Pehrson | bcfd15d | 1999-10-01 14:22:25 -0500 | [diff] [blame] | 1262 | */ |
Glenn Randers-Pehrson | 25228ab | 2002-03-31 07:33:55 -0600 | [diff] [blame^] | 1263 | typedef png_structp version_1_2_2beta6; |
Glenn Randers-Pehrson | bcfd15d | 1999-10-01 14:22:25 -0500 | [diff] [blame] | 1264 | |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 1265 | typedef png_struct FAR * FAR * png_structpp; |
Guy Schalnat | 6d76471 | 1995-12-19 03:22:19 -0600 | [diff] [blame] | 1266 | |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 1267 | /* Here are the function definitions most commonly used. This is not |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 1268 | * the place to find out how to use libpng. See libpng.txt for the |
| 1269 | * full explanation, see example.c for the summary. This just provides |
Glenn Randers-Pehrson | 61c32d9 | 2000-02-04 23:40:16 -0600 | [diff] [blame] | 1270 | * a simple one line description of the use of each function. |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 1271 | */ |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 1272 | |
Glenn Randers-Pehrson | 1ef65b6 | 2000-05-12 06:19:53 -0500 | [diff] [blame] | 1273 | /* Returns the version number of the library */ |
| 1274 | extern PNG_EXPORT(png_uint_32,png_access_version_number) PNGARG((void)); |
| 1275 | |
Andreas Dilger | 02ad0ef | 1997-01-17 01:34:35 -0600 | [diff] [blame] | 1276 | /* Tell lib we have already handled the first <num_bytes> magic bytes. |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 1277 | * Handling more than 8 bytes from the beginning of the file is an error. |
| 1278 | */ |
| 1279 | extern PNG_EXPORT(void,png_set_sig_bytes) PNGARG((png_structp png_ptr, |
| 1280 | int num_bytes)); |
Andreas Dilger | 02ad0ef | 1997-01-17 01:34:35 -0600 | [diff] [blame] | 1281 | |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 1282 | /* Check sig[start] through sig[start + num_to_check - 1] to see if it's a |
| 1283 | * PNG file. Returns zero if the supplied bytes match the 8-byte PNG |
| 1284 | * signature, and non-zero otherwise. Having num_to_check == 0 or |
| 1285 | * start > 7 will always fail (ie return non-zero). |
| 1286 | */ |
| 1287 | extern PNG_EXPORT(int,png_sig_cmp) PNGARG((png_bytep sig, png_size_t start, |
| 1288 | png_size_t num_to_check)); |
Andreas Dilger | 02ad0ef | 1997-01-17 01:34:35 -0600 | [diff] [blame] | 1289 | |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 1290 | /* Simple signature checking function. This is the same as calling |
| 1291 | * png_check_sig(sig, n) := !png_sig_cmp(sig, 0, n). |
| 1292 | */ |
| 1293 | extern PNG_EXPORT(int,png_check_sig) PNGARG((png_bytep sig, int num)); |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 1294 | |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 1295 | /* Allocate and initialize png_ptr struct for reading, and any other memory. */ |
| 1296 | extern PNG_EXPORT(png_structp,png_create_read_struct) |
Glenn Randers-Pehrson | d0dce40 | 1998-05-09 10:02:29 -0500 | [diff] [blame] | 1297 | PNGARG((png_const_charp user_png_ver, png_voidp error_ptr, |
Glenn Randers-Pehrson | b6ce43d | 1998-01-01 07:13:13 -0600 | [diff] [blame] | 1298 | png_error_ptr error_fn, png_error_ptr warn_fn)); |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 1299 | |
Glenn Randers-Pehrson | f7d1a17 | 1998-06-06 15:31:35 -0500 | [diff] [blame] | 1300 | /* Allocate and initialize png_ptr struct for writing, and any other memory */ |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 1301 | extern PNG_EXPORT(png_structp,png_create_write_struct) |
Glenn Randers-Pehrson | d0dce40 | 1998-05-09 10:02:29 -0500 | [diff] [blame] | 1302 | PNGARG((png_const_charp user_png_ver, png_voidp error_ptr, |
Andreas Dilger | 02ad0ef | 1997-01-17 01:34:35 -0600 | [diff] [blame] | 1303 | png_error_ptr error_fn, png_error_ptr warn_fn)); |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 1304 | |
Glenn Randers-Pehrson | 228bd39 | 2000-04-23 23:14:02 -0500 | [diff] [blame] | 1305 | extern PNG_EXPORT(png_uint_32,png_get_compression_buffer_size) |
| 1306 | PNGARG((png_structp png_ptr)); |
| 1307 | |
| 1308 | extern PNG_EXPORT(void,png_set_compression_buffer_size) |
| 1309 | PNGARG((png_structp png_ptr, png_uint_32 size)); |
| 1310 | |
| 1311 | /* Reset the compression stream */ |
| 1312 | extern PNG_EXPORT(int,png_reset_zstream) PNGARG((png_structp png_ptr)); |
| 1313 | |
Glenn Randers-Pehrson | 8b6a889 | 2001-05-18 04:54:50 -0500 | [diff] [blame] | 1314 | /* New functions added in libpng-1.0.2 (not enabled by default until 1.2.0) */ |
Glenn Randers-Pehrson | f7d1a17 | 1998-06-06 15:31:35 -0500 | [diff] [blame] | 1315 | #ifdef PNG_USER_MEM_SUPPORTED |
| 1316 | extern PNG_EXPORT(png_structp,png_create_read_struct_2) |
| 1317 | PNGARG((png_const_charp user_png_ver, png_voidp error_ptr, |
| 1318 | png_error_ptr error_fn, png_error_ptr warn_fn, png_voidp mem_ptr, |
| 1319 | png_malloc_ptr malloc_fn, png_free_ptr free_fn)); |
| 1320 | extern PNG_EXPORT(png_structp,png_create_write_struct_2) |
Glenn Randers-Pehrson | 5c6aeb2 | 1998-12-29 11:47:59 -0600 | [diff] [blame] | 1321 | PNGARG((png_const_charp user_png_ver, png_voidp error_ptr, |
Glenn Randers-Pehrson | f7d1a17 | 1998-06-06 15:31:35 -0500 | [diff] [blame] | 1322 | png_error_ptr error_fn, png_error_ptr warn_fn, png_voidp mem_ptr, |
| 1323 | png_malloc_ptr malloc_fn, png_free_ptr free_fn)); |
| 1324 | #endif |
| 1325 | |
Glenn Randers-Pehrson | cbe52d8 | 1998-02-28 07:00:24 -0600 | [diff] [blame] | 1326 | /* Write a PNG chunk - size, type, (optional) data, CRC. */ |
| 1327 | extern PNG_EXPORT(void,png_write_chunk) PNGARG((png_structp png_ptr, |
| 1328 | png_bytep chunk_name, png_bytep data, png_size_t length)); |
| 1329 | |
| 1330 | /* Write the start of a PNG chunk - length and chunk name. */ |
| 1331 | extern PNG_EXPORT(void,png_write_chunk_start) PNGARG((png_structp png_ptr, |
| 1332 | png_bytep chunk_name, png_uint_32 length)); |
| 1333 | |
| 1334 | /* Write the data of a PNG chunk started with png_write_chunk_start(). */ |
| 1335 | extern PNG_EXPORT(void,png_write_chunk_data) PNGARG((png_structp png_ptr, |
| 1336 | png_bytep data, png_size_t length)); |
| 1337 | |
| 1338 | /* Finish a chunk started with png_write_chunk_start() (includes CRC). */ |
| 1339 | extern PNG_EXPORT(void,png_write_chunk_end) PNGARG((png_structp png_ptr)); |
| 1340 | |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 1341 | /* Allocate and initialize the info structure */ |
| 1342 | extern PNG_EXPORT(png_infop,png_create_info_struct) |
| 1343 | PNGARG((png_structp png_ptr)); |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 1344 | |
Glenn Randers-Pehrson | 8b6a889 | 2001-05-18 04:54:50 -0500 | [diff] [blame] | 1345 | /* Initialize the info structure (old interface - DEPRECATED) */ |
| 1346 | extern PNG_EXPORT(void,png_info_init) PNGARG((png_infop info_ptr)); |
Glenn Randers-Pehrson | b182893 | 2001-06-23 08:03:17 -0500 | [diff] [blame] | 1347 | #define png_info_init(info_ptr) png_info_init_3(&info_ptr, sizeof(png_info)); |
Glenn Randers-Pehrson | 8b6a889 | 2001-05-18 04:54:50 -0500 | [diff] [blame] | 1348 | extern PNG_EXPORT(void,png_info_init_3) PNGARG((png_infopp info_ptr, |
| 1349 | png_size_t png_info_struct_size)); |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 1350 | |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 1351 | /* Writes all the PNG information before the image. */ |
Glenn Randers-Pehrson | 5379b24 | 1999-11-27 10:22:33 -0600 | [diff] [blame] | 1352 | extern PNG_EXPORT(void,png_write_info_before_PLTE) PNGARG((png_structp png_ptr, |
| 1353 | png_infop info_ptr)); |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 1354 | extern PNG_EXPORT(void,png_write_info) PNGARG((png_structp png_ptr, |
| 1355 | png_infop info_ptr)); |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 1356 | |
| 1357 | /* read the information before the actual image data. */ |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 1358 | extern PNG_EXPORT(void,png_read_info) PNGARG((png_structp png_ptr, |
| 1359 | png_infop info_ptr)); |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 1360 | |
Glenn Randers-Pehrson | c4a2ae6 | 1998-01-16 22:06:18 -0600 | [diff] [blame] | 1361 | #if defined(PNG_TIME_RFC1123_SUPPORTED) |
| 1362 | extern PNG_EXPORT(png_charp,png_convert_to_rfc1123) |
Glenn Randers-Pehrson | b6ce43d | 1998-01-01 07:13:13 -0600 | [diff] [blame] | 1363 | PNGARG((png_structp png_ptr, png_timep ptime)); |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame] | 1364 | #endif |
Glenn Randers-Pehrson | b6ce43d | 1998-01-01 07:13:13 -0600 | [diff] [blame] | 1365 | |
Glenn Randers-Pehrson | 316f97a | 2000-07-08 13:19:41 -0500 | [diff] [blame] | 1366 | #if !defined(_WIN32_WCE) |
| 1367 | /* "time.h" functions are not supported on WindowsCE */ |
Guy Schalnat | 0f71645 | 1995-11-28 11:22:13 -0600 | [diff] [blame] | 1368 | #if defined(PNG_WRITE_tIME_SUPPORTED) |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 1369 | /* convert from a struct tm to png_time */ |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 1370 | extern PNG_EXPORT(void,png_convert_from_struct_tm) PNGARG((png_timep ptime, |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 1371 | struct tm FAR * ttime)); |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 1372 | |
| 1373 | /* convert from time_t to png_time. Uses gmtime() */ |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 1374 | extern PNG_EXPORT(void,png_convert_from_time_t) PNGARG((png_timep ptime, |
| 1375 | time_t ttime)); |
| 1376 | #endif /* PNG_WRITE_tIME_SUPPORTED */ |
Glenn Randers-Pehrson | 316f97a | 2000-07-08 13:19:41 -0500 | [diff] [blame] | 1377 | #endif /* _WIN32_WCE */ |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 1378 | |
Guy Schalnat | 51f0eb4 | 1995-09-26 05:22:39 -0500 | [diff] [blame] | 1379 | #if defined(PNG_READ_EXPAND_SUPPORTED) |
Glenn Randers-Pehrson | 4393a9a | 1999-09-17 12:27:26 -0500 | [diff] [blame] | 1380 | /* Expand data to 24-bit RGB, or 8-bit grayscale, with alpha if available. */ |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 1381 | extern PNG_EXPORT(void,png_set_expand) PNGARG((png_structp png_ptr)); |
Glenn Randers-Pehrson | 4393a9a | 1999-09-17 12:27:26 -0500 | [diff] [blame] | 1382 | extern PNG_EXPORT(void,png_set_gray_1_2_4_to_8) PNGARG((png_structp png_ptr)); |
| 1383 | extern PNG_EXPORT(void,png_set_palette_to_rgb) PNGARG((png_structp png_ptr)); |
| 1384 | extern PNG_EXPORT(void,png_set_tRNS_to_alpha) PNGARG((png_structp png_ptr)); |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame] | 1385 | #endif |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 1386 | |
Guy Schalnat | 51f0eb4 | 1995-09-26 05:22:39 -0500 | [diff] [blame] | 1387 | #if defined(PNG_READ_BGR_SUPPORTED) || defined(PNG_WRITE_BGR_SUPPORTED) |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 1388 | /* Use blue, green, red order for pixels. */ |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 1389 | extern PNG_EXPORT(void,png_set_bgr) PNGARG((png_structp png_ptr)); |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame] | 1390 | #endif |
Guy Schalnat | 51f0eb4 | 1995-09-26 05:22:39 -0500 | [diff] [blame] | 1391 | |
Guy Schalnat | 69b1448 | 1996-01-10 02:56:49 -0600 | [diff] [blame] | 1392 | #if defined(PNG_READ_GRAY_TO_RGB_SUPPORTED) |
Glenn Randers-Pehrson | 4393a9a | 1999-09-17 12:27:26 -0500 | [diff] [blame] | 1393 | /* Expand the grayscale to 24-bit RGB if necessary. */ |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 1394 | extern PNG_EXPORT(void,png_set_gray_to_rgb) PNGARG((png_structp png_ptr)); |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame] | 1395 | #endif |
Guy Schalnat | 69b1448 | 1996-01-10 02:56:49 -0600 | [diff] [blame] | 1396 | |
Andreas Dilger | 02ad0ef | 1997-01-17 01:34:35 -0600 | [diff] [blame] | 1397 | #if defined(PNG_READ_RGB_TO_GRAY_SUPPORTED) |
Glenn Randers-Pehrson | 5c6aeb2 | 1998-12-29 11:47:59 -0600 | [diff] [blame] | 1398 | /* Reduce RGB to grayscale. */ |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame] | 1399 | #ifdef PNG_FLOATING_POINT_SUPPORTED |
Glenn Randers-Pehrson | 5c6aeb2 | 1998-12-29 11:47:59 -0600 | [diff] [blame] | 1400 | extern PNG_EXPORT(void,png_set_rgb_to_gray) PNGARG((png_structp png_ptr, |
Glenn Randers-Pehrson | 4393a9a | 1999-09-17 12:27:26 -0500 | [diff] [blame] | 1401 | int error_action, double red, double green )); |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame] | 1402 | #endif |
Glenn Randers-Pehrson | 520a764 | 2000-03-21 05:13:06 -0600 | [diff] [blame] | 1403 | extern PNG_EXPORT(void,png_set_rgb_to_gray_fixed) PNGARG((png_structp png_ptr, |
| 1404 | int error_action, png_fixed_point red, png_fixed_point green )); |
Glenn Randers-Pehrson | 5c6aeb2 | 1998-12-29 11:47:59 -0600 | [diff] [blame] | 1405 | extern PNG_EXPORT(png_byte,png_get_rgb_to_gray_status) PNGARG((png_structp |
| 1406 | png_ptr)); |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame] | 1407 | #endif |
Andreas Dilger | 02ad0ef | 1997-01-17 01:34:35 -0600 | [diff] [blame] | 1408 | |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 1409 | extern PNG_EXPORT(void,png_build_grayscale_palette) PNGARG((int bit_depth, |
Andreas Dilger | 02ad0ef | 1997-01-17 01:34:35 -0600 | [diff] [blame] | 1410 | png_colorp palette)); |
| 1411 | |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 1412 | #if defined(PNG_READ_STRIP_ALPHA_SUPPORTED) |
| 1413 | extern PNG_EXPORT(void,png_set_strip_alpha) PNGARG((png_structp png_ptr)); |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame] | 1414 | #endif |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 1415 | |
| 1416 | #if defined(PNG_READ_SWAP_ALPHA_SUPPORTED) || \ |
| 1417 | defined(PNG_WRITE_SWAP_ALPHA_SUPPORTED) |
| 1418 | extern PNG_EXPORT(void,png_set_swap_alpha) PNGARG((png_structp png_ptr)); |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame] | 1419 | #endif |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 1420 | |
Glenn Randers-Pehrson | c4a2ae6 | 1998-01-16 22:06:18 -0600 | [diff] [blame] | 1421 | #if defined(PNG_READ_INVERT_ALPHA_SUPPORTED) || \ |
| 1422 | defined(PNG_WRITE_INVERT_ALPHA_SUPPORTED) |
| 1423 | extern PNG_EXPORT(void,png_set_invert_alpha) PNGARG((png_structp png_ptr)); |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame] | 1424 | #endif |
Glenn Randers-Pehrson | c4a2ae6 | 1998-01-16 22:06:18 -0600 | [diff] [blame] | 1425 | |
Guy Schalnat | 51f0eb4 | 1995-09-26 05:22:39 -0500 | [diff] [blame] | 1426 | #if defined(PNG_READ_FILLER_SUPPORTED) || defined(PNG_WRITE_FILLER_SUPPORTED) |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 1427 | /* Add a filler byte to 24-bit RGB images. */ |
| 1428 | extern PNG_EXPORT(void,png_set_filler) PNGARG((png_structp png_ptr, |
| 1429 | png_uint_32 filler, int flags)); |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 1430 | /* The values of the PNG_FILLER_ defines should NOT be changed */ |
Guy Schalnat | 51f0eb4 | 1995-09-26 05:22:39 -0500 | [diff] [blame] | 1431 | #define PNG_FILLER_BEFORE 0 |
| 1432 | #define PNG_FILLER_AFTER 1 |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 1433 | #endif /* PNG_READ_FILLER_SUPPORTED || PNG_WRITE_FILLER_SUPPORTED */ |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 1434 | |
Guy Schalnat | 51f0eb4 | 1995-09-26 05:22:39 -0500 | [diff] [blame] | 1435 | #if defined(PNG_READ_SWAP_SUPPORTED) || defined(PNG_WRITE_SWAP_SUPPORTED) |
Glenn Randers-Pehrson | 4393a9a | 1999-09-17 12:27:26 -0500 | [diff] [blame] | 1436 | /* Swap bytes in 16-bit depth files. */ |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 1437 | extern PNG_EXPORT(void,png_set_swap) PNGARG((png_structp png_ptr)); |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame] | 1438 | #endif |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 1439 | |
Guy Schalnat | 51f0eb4 | 1995-09-26 05:22:39 -0500 | [diff] [blame] | 1440 | #if defined(PNG_READ_PACK_SUPPORTED) || defined(PNG_WRITE_PACK_SUPPORTED) |
Glenn Randers-Pehrson | 4393a9a | 1999-09-17 12:27:26 -0500 | [diff] [blame] | 1441 | /* Use 1 byte per pixel in 1, 2, or 4-bit depth files. */ |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 1442 | extern PNG_EXPORT(void,png_set_packing) PNGARG((png_structp png_ptr)); |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame] | 1443 | #endif |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 1444 | |
Glenn Randers-Pehrson | 38d73af | 1998-03-07 21:30:44 -0600 | [diff] [blame] | 1445 | #if defined(PNG_READ_PACKSWAP_SUPPORTED) || defined(PNG_WRITE_PACKSWAP_SUPPORTED) |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 1446 | /* Swap packing order of pixels in bytes. */ |
| 1447 | extern PNG_EXPORT(void,png_set_packswap) PNGARG((png_structp png_ptr)); |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame] | 1448 | #endif |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 1449 | |
Guy Schalnat | 51f0eb4 | 1995-09-26 05:22:39 -0500 | [diff] [blame] | 1450 | #if defined(PNG_READ_SHIFT_SUPPORTED) || defined(PNG_WRITE_SHIFT_SUPPORTED) |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 1451 | /* Converts files to legal bit depths. */ |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 1452 | extern PNG_EXPORT(void,png_set_shift) PNGARG((png_structp png_ptr, |
Guy Schalnat | 6d76471 | 1995-12-19 03:22:19 -0600 | [diff] [blame] | 1453 | png_color_8p true_bits)); |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame] | 1454 | #endif |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 1455 | |
Guy Schalnat | 51f0eb4 | 1995-09-26 05:22:39 -0500 | [diff] [blame] | 1456 | #if defined(PNG_READ_INTERLACING_SUPPORTED) || \ |
| 1457 | defined(PNG_WRITE_INTERLACING_SUPPORTED) |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 1458 | /* Have the code handle the interlacing. Returns the number of passes. */ |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 1459 | extern PNG_EXPORT(int,png_set_interlace_handling) PNGARG((png_structp png_ptr)); |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame] | 1460 | #endif |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 1461 | |
Guy Schalnat | 51f0eb4 | 1995-09-26 05:22:39 -0500 | [diff] [blame] | 1462 | #if defined(PNG_READ_INVERT_SUPPORTED) || defined(PNG_WRITE_INVERT_SUPPORTED) |
Glenn Randers-Pehrson | 104622b | 2000-05-29 08:58:03 -0500 | [diff] [blame] | 1463 | /* Invert monochrome files */ |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 1464 | extern PNG_EXPORT(void,png_set_invert_mono) PNGARG((png_structp png_ptr)); |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame] | 1465 | #endif |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 1466 | |
Guy Schalnat | 51f0eb4 | 1995-09-26 05:22:39 -0500 | [diff] [blame] | 1467 | #if defined(PNG_READ_BACKGROUND_SUPPORTED) |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 1468 | /* Handle alpha and tRNS by replacing with a background color. */ |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame] | 1469 | #ifdef PNG_FLOATING_POINT_SUPPORTED |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 1470 | extern PNG_EXPORT(void,png_set_background) PNGARG((png_structp png_ptr, |
| 1471 | png_color_16p background_color, int background_gamma_code, |
| 1472 | int need_expand, double background_gamma)); |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame] | 1473 | #endif |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 1474 | #define PNG_BACKGROUND_GAMMA_UNKNOWN 0 |
| 1475 | #define PNG_BACKGROUND_GAMMA_SCREEN 1 |
| 1476 | #define PNG_BACKGROUND_GAMMA_FILE 2 |
| 1477 | #define PNG_BACKGROUND_GAMMA_UNIQUE 3 |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame] | 1478 | #endif |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 1479 | |
Guy Schalnat | 51f0eb4 | 1995-09-26 05:22:39 -0500 | [diff] [blame] | 1480 | #if defined(PNG_READ_16_TO_8_SUPPORTED) |
Glenn Randers-Pehrson | 4393a9a | 1999-09-17 12:27:26 -0500 | [diff] [blame] | 1481 | /* strip the second byte of information from a 16-bit depth file. */ |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 1482 | extern PNG_EXPORT(void,png_set_strip_16) PNGARG((png_structp png_ptr)); |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame] | 1483 | #endif |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 1484 | |
Guy Schalnat | 51f0eb4 | 1995-09-26 05:22:39 -0500 | [diff] [blame] | 1485 | #if defined(PNG_READ_DITHER_SUPPORTED) |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 1486 | /* Turn on dithering, and reduce the palette to the number of colors available. */ |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 1487 | extern PNG_EXPORT(void,png_set_dither) PNGARG((png_structp png_ptr, |
| 1488 | png_colorp palette, int num_palette, int maximum_colors, |
| 1489 | png_uint_16p histogram, int full_dither)); |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame] | 1490 | #endif |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 1491 | |
Guy Schalnat | 51f0eb4 | 1995-09-26 05:22:39 -0500 | [diff] [blame] | 1492 | #if defined(PNG_READ_GAMMA_SUPPORTED) |
Glenn Randers-Pehrson | bcfd15d | 1999-10-01 14:22:25 -0500 | [diff] [blame] | 1493 | /* Handle gamma correction. Screen_gamma=(display_exponent) */ |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame] | 1494 | #ifdef PNG_FLOATING_POINT_SUPPORTED |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 1495 | extern PNG_EXPORT(void,png_set_gamma) PNGARG((png_structp png_ptr, |
| 1496 | double screen_gamma, double default_file_gamma)); |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame] | 1497 | #endif |
| 1498 | #endif |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 1499 | |
Glenn Randers-Pehrson | 4393a9a | 1999-09-17 12:27:26 -0500 | [diff] [blame] | 1500 | #if defined(PNG_READ_EMPTY_PLTE_SUPPORTED) || \ |
| 1501 | defined(PNG_WRITE_EMPTY_PLTE_SUPPORTED) |
| 1502 | /* Permit or disallow empty PLTE (0: not permitted, 1: permitted) */ |
Glenn Randers-Pehrson | 5e5c1e1 | 2000-11-10 12:26:19 -0600 | [diff] [blame] | 1503 | /* Deprecated and will be removed. Use png_permit_mng_features() instead. */ |
Glenn Randers-Pehrson | 4393a9a | 1999-09-17 12:27:26 -0500 | [diff] [blame] | 1504 | extern PNG_EXPORT(void,png_permit_empty_plte) PNGARG((png_structp png_ptr, |
| 1505 | int empty_plte_permitted)); |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame] | 1506 | #endif |
Glenn Randers-Pehrson | 4393a9a | 1999-09-17 12:27:26 -0500 | [diff] [blame] | 1507 | |
Guy Schalnat | 0f71645 | 1995-11-28 11:22:13 -0600 | [diff] [blame] | 1508 | #if defined(PNG_WRITE_FLUSH_SUPPORTED) |
| 1509 | /* Set how many lines between output flushes - 0 for no flushing */ |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 1510 | extern PNG_EXPORT(void,png_set_flush) PNGARG((png_structp png_ptr, int nrows)); |
Guy Schalnat | 0f71645 | 1995-11-28 11:22:13 -0600 | [diff] [blame] | 1511 | /* Flush the current PNG output buffer */ |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 1512 | extern PNG_EXPORT(void,png_write_flush) PNGARG((png_structp png_ptr)); |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame] | 1513 | #endif |
Guy Schalnat | 0f71645 | 1995-11-28 11:22:13 -0600 | [diff] [blame] | 1514 | |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 1515 | /* optional update palette with requested transformations */ |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 1516 | extern PNG_EXPORT(void,png_start_read_image) PNGARG((png_structp png_ptr)); |
Guy Schalnat | 51f0eb4 | 1995-09-26 05:22:39 -0500 | [diff] [blame] | 1517 | |
| 1518 | /* optional call to update the users info structure */ |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 1519 | extern PNG_EXPORT(void,png_read_update_info) PNGARG((png_structp png_ptr, |
Guy Schalnat | 4ee97b0 | 1996-01-16 01:51:56 -0600 | [diff] [blame] | 1520 | png_infop info_ptr)); |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 1521 | |
| 1522 | /* read a one or more rows of image data.*/ |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 1523 | extern PNG_EXPORT(void,png_read_rows) PNGARG((png_structp png_ptr, |
| 1524 | png_bytepp row, png_bytepp display_row, png_uint_32 num_rows)); |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 1525 | |
| 1526 | /* read a row of data.*/ |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 1527 | extern PNG_EXPORT(void,png_read_row) PNGARG((png_structp png_ptr, |
Guy Schalnat | 4ee97b0 | 1996-01-16 01:51:56 -0600 | [diff] [blame] | 1528 | png_bytep row, |
| 1529 | png_bytep display_row)); |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 1530 | |
| 1531 | /* read the whole image into memory at once. */ |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 1532 | extern PNG_EXPORT(void,png_read_image) PNGARG((png_structp png_ptr, |
Guy Schalnat | 4ee97b0 | 1996-01-16 01:51:56 -0600 | [diff] [blame] | 1533 | png_bytepp image)); |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 1534 | |
| 1535 | /* write a row of image data */ |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 1536 | extern PNG_EXPORT(void,png_write_row) PNGARG((png_structp png_ptr, |
Guy Schalnat | 4ee97b0 | 1996-01-16 01:51:56 -0600 | [diff] [blame] | 1537 | png_bytep row)); |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 1538 | |
| 1539 | /* write a few rows of image data */ |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 1540 | extern PNG_EXPORT(void,png_write_rows) PNGARG((png_structp png_ptr, |
| 1541 | png_bytepp row, png_uint_32 num_rows)); |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 1542 | |
| 1543 | /* write the image data */ |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 1544 | extern PNG_EXPORT(void,png_write_image) PNGARG((png_structp png_ptr, |
| 1545 | png_bytepp image)); |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 1546 | |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 1547 | /* writes the end of the PNG file. */ |
| 1548 | extern PNG_EXPORT(void,png_write_end) PNGARG((png_structp png_ptr, |
| 1549 | png_infop info_ptr)); |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 1550 | |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 1551 | /* read the end of the PNG file. */ |
| 1552 | extern PNG_EXPORT(void,png_read_end) PNGARG((png_structp png_ptr, |
| 1553 | png_infop info_ptr)); |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 1554 | |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 1555 | /* free any memory associated with the png_info_struct */ |
| 1556 | extern PNG_EXPORT(void,png_destroy_info_struct) PNGARG((png_structp png_ptr, |
Andreas Dilger | 02ad0ef | 1997-01-17 01:34:35 -0600 | [diff] [blame] | 1557 | png_infopp info_ptr_ptr)); |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 1558 | |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 1559 | /* free any memory associated with the png_struct and the png_info_structs */ |
| 1560 | extern PNG_EXPORT(void,png_destroy_read_struct) PNGARG((png_structpp |
| 1561 | png_ptr_ptr, png_infopp info_ptr_ptr, png_infopp end_info_ptr_ptr)); |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 1562 | |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 1563 | /* free all memory used by the read (old method - NOT DLL EXPORTED) */ |
Andreas Dilger | 02ad0ef | 1997-01-17 01:34:35 -0600 | [diff] [blame] | 1564 | extern void png_read_destroy PNGARG((png_structp png_ptr, png_infop info_ptr, |
| 1565 | png_infop end_info_ptr)); |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 1566 | |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 1567 | /* free any memory associated with the png_struct and the png_info_structs */ |
| 1568 | extern PNG_EXPORT(void,png_destroy_write_struct) |
| 1569 | PNGARG((png_structpp png_ptr_ptr, png_infopp info_ptr_ptr)); |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 1570 | |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 1571 | /* free any memory used in png_ptr struct (old method - NOT DLL EXPORTED) */ |
Guy Schalnat | 6d76471 | 1995-12-19 03:22:19 -0600 | [diff] [blame] | 1572 | extern void png_write_destroy PNGARG((png_structp png_ptr)); |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 1573 | |
Andreas Dilger | 02ad0ef | 1997-01-17 01:34:35 -0600 | [diff] [blame] | 1574 | /* set the libpng method of handling chunk CRC errors */ |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 1575 | extern PNG_EXPORT(void,png_set_crc_action) PNGARG((png_structp png_ptr, |
| 1576 | int crit_action, int ancil_action)); |
Andreas Dilger | 02ad0ef | 1997-01-17 01:34:35 -0600 | [diff] [blame] | 1577 | |
| 1578 | /* Values for png_set_crc_action() to say how to handle CRC errors in |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 1579 | * ancillary and critical chunks, and whether to use the data contained |
| 1580 | * therein. Note that it is impossible to "discard" data in a critical |
| 1581 | * chunk. For versions prior to 0.90, the action was always error/quit, |
| 1582 | * whereas in version 0.90 and later, the action for CRC errors in ancillary |
| 1583 | * chunks is warn/discard. These values should NOT be changed. |
| 1584 | * |
| 1585 | * value action:critical action:ancillary |
Andreas Dilger | 02ad0ef | 1997-01-17 01:34:35 -0600 | [diff] [blame] | 1586 | */ |
| 1587 | #define PNG_CRC_DEFAULT 0 /* error/quit warn/discard data */ |
| 1588 | #define PNG_CRC_ERROR_QUIT 1 /* error/quit error/quit */ |
| 1589 | #define PNG_CRC_WARN_DISCARD 2 /* (INVALID) warn/discard data */ |
| 1590 | #define PNG_CRC_WARN_USE 3 /* warn/use data warn/use data */ |
| 1591 | #define PNG_CRC_QUIET_USE 4 /* quiet/use data quiet/use data */ |
| 1592 | #define PNG_CRC_NO_CHANGE 5 /* use current value use current value */ |
| 1593 | |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 1594 | /* These functions give the user control over the scan-line filtering in |
| 1595 | * libpng and the compression methods used by zlib. These functions are |
| 1596 | * mainly useful for testing, as the defaults should work with most users. |
| 1597 | * Those users who are tight on memory or want faster performance at the |
| 1598 | * expense of compression can modify them. See the compression library |
Glenn Randers-Pehrson | b6ce43d | 1998-01-01 07:13:13 -0600 | [diff] [blame] | 1599 | * header file (zlib.h) for an explination of the compression functions. |
| 1600 | */ |
Andreas Dilger | 02ad0ef | 1997-01-17 01:34:35 -0600 | [diff] [blame] | 1601 | |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 1602 | /* set the filtering method(s) used by libpng. Currently, the only valid |
Glenn Randers-Pehrson | b6ce43d | 1998-01-01 07:13:13 -0600 | [diff] [blame] | 1603 | * value for "method" is 0. |
| 1604 | */ |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 1605 | extern PNG_EXPORT(void,png_set_filter) PNGARG((png_structp png_ptr, int method, |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 1606 | int filters)); |
Guy Schalnat | 51f0eb4 | 1995-09-26 05:22:39 -0500 | [diff] [blame] | 1607 | |
Andreas Dilger | 02ad0ef | 1997-01-17 01:34:35 -0600 | [diff] [blame] | 1608 | /* Flags for png_set_filter() to say which filters to use. The flags |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 1609 | * are chosen so that they don't conflict with real filter types |
| 1610 | * below, in case they are supplied instead of the #defined constants. |
| 1611 | * These values should NOT be changed. |
Andreas Dilger | 02ad0ef | 1997-01-17 01:34:35 -0600 | [diff] [blame] | 1612 | */ |
| 1613 | #define PNG_NO_FILTERS 0x00 |
| 1614 | #define PNG_FILTER_NONE 0x08 |
| 1615 | #define PNG_FILTER_SUB 0x10 |
| 1616 | #define PNG_FILTER_UP 0x20 |
| 1617 | #define PNG_FILTER_AVG 0x40 |
| 1618 | #define PNG_FILTER_PAETH 0x80 |
| 1619 | #define PNG_ALL_FILTERS (PNG_FILTER_NONE | PNG_FILTER_SUB | PNG_FILTER_UP | \ |
| 1620 | PNG_FILTER_AVG | PNG_FILTER_PAETH) |
| 1621 | |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 1622 | /* Filter values (not flags) - used in pngwrite.c, pngwutil.c for now. |
| 1623 | * These defines should NOT be changed. |
| 1624 | */ |
| 1625 | #define PNG_FILTER_VALUE_NONE 0 |
| 1626 | #define PNG_FILTER_VALUE_SUB 1 |
| 1627 | #define PNG_FILTER_VALUE_UP 2 |
| 1628 | #define PNG_FILTER_VALUE_AVG 3 |
| 1629 | #define PNG_FILTER_VALUE_PAETH 4 |
| 1630 | #define PNG_FILTER_VALUE_LAST 5 |
| 1631 | |
| 1632 | #if defined(PNG_WRITE_WEIGHTED_FILTER_SUPPORTED) /* EXPERIMENTAL */ |
| 1633 | /* The "heuristic_method" is given by one of the PNG_FILTER_HEURISTIC_ |
| 1634 | * defines, either the default (minimum-sum-of-absolute-differences), or |
| 1635 | * the experimental method (weighted-minimum-sum-of-absolute-differences). |
| 1636 | * |
| 1637 | * Weights are factors >= 1.0, indicating how important it is to keep the |
| 1638 | * filter type consistent between rows. Larger numbers mean the current |
| 1639 | * filter is that many times as likely to be the same as the "num_weights" |
| 1640 | * previous filters. This is cumulative for each previous row with a weight. |
| 1641 | * There needs to be "num_weights" values in "filter_weights", or it can be |
| 1642 | * NULL if the weights aren't being specified. Weights have no influence on |
| 1643 | * the selection of the first row filter. Well chosen weights can (in theory) |
| 1644 | * improve the compression for a given image. |
| 1645 | * |
| 1646 | * Costs are factors >= 1.0 indicating the relative decoding costs of a |
| 1647 | * filter type. Higher costs indicate more decoding expense, and are |
| 1648 | * therefore less likely to be selected over a filter with lower computational |
| 1649 | * costs. There needs to be a value in "filter_costs" for each valid filter |
| 1650 | * type (given by PNG_FILTER_VALUE_LAST), or it can be NULL if you aren't |
| 1651 | * setting the costs. Costs try to improve the speed of decompression without |
| 1652 | * unduly increasing the compressed image size. |
| 1653 | * |
| 1654 | * A negative weight or cost indicates the default value is to be used, and |
| 1655 | * values in the range [0.0, 1.0) indicate the value is to remain unchanged. |
| 1656 | * The default values for both weights and costs are currently 1.0, but may |
| 1657 | * change if good general weighting/cost heuristics can be found. If both |
| 1658 | * the weights and costs are set to 1.0, this degenerates the WEIGHTED method |
| 1659 | * to the UNWEIGHTED method, but with added encoding time/computation. |
| 1660 | */ |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame] | 1661 | #ifdef PNG_FLOATING_POINT_SUPPORTED |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 1662 | extern PNG_EXPORT(void,png_set_filter_heuristics) PNGARG((png_structp png_ptr, |
| 1663 | int heuristic_method, int num_weights, png_doublep filter_weights, |
| 1664 | png_doublep filter_costs)); |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame] | 1665 | #endif |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 1666 | #endif /* PNG_WRITE_WEIGHTED_FILTER_SUPPORTED */ |
| 1667 | |
| 1668 | /* Heuristic used for row filter selection. These defines should NOT be |
| 1669 | * changed. |
| 1670 | */ |
| 1671 | #define PNG_FILTER_HEURISTIC_DEFAULT 0 /* Currently "UNWEIGHTED" */ |
| 1672 | #define PNG_FILTER_HEURISTIC_UNWEIGHTED 1 /* Used by libpng < 0.95 */ |
| 1673 | #define PNG_FILTER_HEURISTIC_WEIGHTED 2 /* Experimental feature */ |
| 1674 | #define PNG_FILTER_HEURISTIC_LAST 3 /* Not a valid value */ |
| 1675 | |
| 1676 | /* Set the library compression level. Currently, valid values range from |
| 1677 | * 0 - 9, corresponding directly to the zlib compression levels 0 - 9 |
| 1678 | * (0 - no compression, 9 - "maximal" compression). Note that tests have |
| 1679 | * shown that zlib compression levels 3-6 usually perform as well as level 9 |
| 1680 | * for PNG images, and do considerably fewer caclulations. In the future, |
| 1681 | * these values may not correspond directly to the zlib compression levels. |
| 1682 | */ |
| 1683 | extern PNG_EXPORT(void,png_set_compression_level) PNGARG((png_structp png_ptr, |
Guy Schalnat | 51f0eb4 | 1995-09-26 05:22:39 -0500 | [diff] [blame] | 1684 | int level)); |
| 1685 | |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 1686 | extern PNG_EXPORT(void,png_set_compression_mem_level) |
| 1687 | PNGARG((png_structp png_ptr, int mem_level)); |
Guy Schalnat | 51f0eb4 | 1995-09-26 05:22:39 -0500 | [diff] [blame] | 1688 | |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 1689 | extern PNG_EXPORT(void,png_set_compression_strategy) |
| 1690 | PNGARG((png_structp png_ptr, int strategy)); |
Guy Schalnat | 51f0eb4 | 1995-09-26 05:22:39 -0500 | [diff] [blame] | 1691 | |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 1692 | extern PNG_EXPORT(void,png_set_compression_window_bits) |
| 1693 | PNGARG((png_structp png_ptr, int window_bits)); |
Guy Schalnat | 51f0eb4 | 1995-09-26 05:22:39 -0500 | [diff] [blame] | 1694 | |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 1695 | extern PNG_EXPORT(void,png_set_compression_method) PNGARG((png_structp png_ptr, |
Guy Schalnat | 51f0eb4 | 1995-09-26 05:22:39 -0500 | [diff] [blame] | 1696 | int method)); |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 1697 | |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 1698 | /* These next functions are called for input/output, memory, and error |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 1699 | * handling. They are in the file pngrio.c, pngwio.c, and pngerror.c, |
| 1700 | * and call standard C I/O routines such as fread(), fwrite(), and |
| 1701 | * fprintf(). These functions can be made to use other I/O routines |
| 1702 | * at run time for those applications that need to handle I/O in a |
| 1703 | * different manner by calling png_set_???_fn(). See libpng.txt for |
| 1704 | * more information. |
| 1705 | */ |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 1706 | |
Glenn Randers-Pehrson | 70e3f54 | 1998-01-03 22:40:55 -0600 | [diff] [blame] | 1707 | #if !defined(PNG_NO_STDIO) |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 1708 | /* Initialize the input/output for the PNG file to the default functions. */ |
Glenn Randers-Pehrson | 15dac0b | 2000-07-10 07:48:54 -0500 | [diff] [blame] | 1709 | extern PNG_EXPORT(void,png_init_io) PNGARG((png_structp png_ptr, png_FILE_p fp)); |
Glenn Randers-Pehrson | 70e3f54 | 1998-01-03 22:40:55 -0600 | [diff] [blame] | 1710 | #endif |
Guy Schalnat | 6d76471 | 1995-12-19 03:22:19 -0600 | [diff] [blame] | 1711 | |
Andreas Dilger | 02ad0ef | 1997-01-17 01:34:35 -0600 | [diff] [blame] | 1712 | /* Replace the (error and abort), and warning functions with user |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 1713 | * supplied functions. If no messages are to be printed you must still |
| 1714 | * write and use replacement functions. The replacement error_fn should |
| 1715 | * still do a longjmp to the last setjmp location if you are using this |
| 1716 | * method of error handling. If error_fn or warning_fn is NULL, the |
| 1717 | * default function will be used. |
| 1718 | */ |
Glenn Randers-Pehrson | 5c6aeb2 | 1998-12-29 11:47:59 -0600 | [diff] [blame] | 1719 | |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 1720 | extern PNG_EXPORT(void,png_set_error_fn) PNGARG((png_structp png_ptr, |
| 1721 | png_voidp error_ptr, png_error_ptr error_fn, png_error_ptr warning_fn)); |
Guy Schalnat | 6d76471 | 1995-12-19 03:22:19 -0600 | [diff] [blame] | 1722 | |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 1723 | /* Return the user pointer associated with the error functions */ |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 1724 | extern PNG_EXPORT(png_voidp,png_get_error_ptr) PNGARG((png_structp png_ptr)); |
Guy Schalnat | 6d76471 | 1995-12-19 03:22:19 -0600 | [diff] [blame] | 1725 | |
| 1726 | /* Replace the default data output functions with a user supplied one(s). |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 1727 | * If buffered output is not used, then output_flush_fn can be set to NULL. |
| 1728 | * If PNG_WRITE_FLUSH_SUPPORTED is not defined at libpng compile time |
| 1729 | * output_flush_fn will be ignored (and thus can be NULL). |
| 1730 | */ |
| 1731 | extern PNG_EXPORT(void,png_set_write_fn) PNGARG((png_structp png_ptr, |
| 1732 | png_voidp io_ptr, png_rw_ptr write_data_fn, png_flush_ptr output_flush_fn)); |
Guy Schalnat | 6d76471 | 1995-12-19 03:22:19 -0600 | [diff] [blame] | 1733 | |
| 1734 | /* Replace the default data input function with a user supplied one. */ |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 1735 | extern PNG_EXPORT(void,png_set_read_fn) PNGARG((png_structp png_ptr, |
| 1736 | png_voidp io_ptr, png_rw_ptr read_data_fn)); |
Guy Schalnat | 6d76471 | 1995-12-19 03:22:19 -0600 | [diff] [blame] | 1737 | |
| 1738 | /* Return the user pointer associated with the I/O functions */ |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 1739 | extern PNG_EXPORT(png_voidp,png_get_io_ptr) PNGARG((png_structp png_ptr)); |
Guy Schalnat | 6d76471 | 1995-12-19 03:22:19 -0600 | [diff] [blame] | 1740 | |
Glenn Randers-Pehrson | 08a3343 | 1998-03-07 06:06:55 -0600 | [diff] [blame] | 1741 | extern PNG_EXPORT(void,png_set_read_status_fn) PNGARG((png_structp png_ptr, |
| 1742 | png_read_status_ptr read_row_fn)); |
| 1743 | |
| 1744 | extern PNG_EXPORT(void,png_set_write_status_fn) PNGARG((png_structp png_ptr, |
| 1745 | png_write_status_ptr write_row_fn)); |
| 1746 | |
Glenn Randers-Pehrson | f7d1a17 | 1998-06-06 15:31:35 -0500 | [diff] [blame] | 1747 | #ifdef PNG_USER_MEM_SUPPORTED |
| 1748 | /* Replace the default memory allocation functions with user supplied one(s). */ |
| 1749 | extern PNG_EXPORT(void,png_set_mem_fn) PNGARG((png_structp png_ptr, |
| 1750 | png_voidp mem_ptr, png_malloc_ptr malloc_fn, png_free_ptr free_fn)); |
Glenn Randers-Pehrson | f7d1a17 | 1998-06-06 15:31:35 -0500 | [diff] [blame] | 1751 | /* Return the user pointer associated with the memory functions */ |
| 1752 | extern PNG_EXPORT(png_voidp,png_get_mem_ptr) PNGARG((png_structp png_ptr)); |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame] | 1753 | #endif |
Glenn Randers-Pehrson | f7d1a17 | 1998-06-06 15:31:35 -0500 | [diff] [blame] | 1754 | |
Glenn Randers-Pehrson | 6942d53 | 2000-05-01 09:31:54 -0500 | [diff] [blame] | 1755 | #if defined(PNG_READ_USER_TRANSFORM_SUPPORTED) || \ |
| 1756 | defined(PNG_LEGACY_SUPPORTED) |
Glenn Randers-Pehrson | 08a3343 | 1998-03-07 06:06:55 -0600 | [diff] [blame] | 1757 | extern PNG_EXPORT(void,png_set_read_user_transform_fn) PNGARG((png_structp |
| 1758 | png_ptr, png_user_transform_ptr read_user_transform_fn)); |
| 1759 | #endif |
| 1760 | |
Glenn Randers-Pehrson | 6942d53 | 2000-05-01 09:31:54 -0500 | [diff] [blame] | 1761 | #if defined(PNG_WRITE_USER_TRANSFORM_SUPPORTED) || \ |
| 1762 | defined(PNG_LEGACY_SUPPORTED) |
Glenn Randers-Pehrson | 08a3343 | 1998-03-07 06:06:55 -0600 | [diff] [blame] | 1763 | extern PNG_EXPORT(void,png_set_write_user_transform_fn) PNGARG((png_structp |
| 1764 | png_ptr, png_user_transform_ptr write_user_transform_fn)); |
| 1765 | #endif |
| 1766 | |
Glenn Randers-Pehrson | 4393a9a | 1999-09-17 12:27:26 -0500 | [diff] [blame] | 1767 | #if defined(PNG_READ_USER_TRANSFORM_SUPPORTED) || \ |
Glenn Randers-Pehrson | 6942d53 | 2000-05-01 09:31:54 -0500 | [diff] [blame] | 1768 | defined(PNG_WRITE_USER_TRANSFORM_SUPPORTED) || \ |
| 1769 | defined(PNG_LEGACY_SUPPORTED) |
Glenn Randers-Pehrson | 4393a9a | 1999-09-17 12:27:26 -0500 | [diff] [blame] | 1770 | extern PNG_EXPORT(void,png_set_user_transform_info) PNGARG((png_structp |
| 1771 | png_ptr, png_voidp user_transform_ptr, int user_transform_depth, |
| 1772 | int user_transform_channels)); |
| 1773 | /* Return the user pointer associated with the user transform functions */ |
| 1774 | extern PNG_EXPORT(png_voidp,png_get_user_transform_ptr) |
| 1775 | PNGARG((png_structp png_ptr)); |
| 1776 | #endif |
| 1777 | |
Glenn Randers-Pehrson | 1909560 | 2001-03-14 07:08:39 -0600 | [diff] [blame] | 1778 | #ifdef PNG_USER_CHUNKS_SUPPORTED |
Glenn Randers-Pehrson | 61c32d9 | 2000-02-04 23:40:16 -0600 | [diff] [blame] | 1779 | extern PNG_EXPORT(void,png_set_read_user_chunk_fn) PNGARG((png_structp png_ptr, |
| 1780 | png_voidp user_chunk_ptr, png_user_chunk_ptr read_user_chunk_fn)); |
| 1781 | extern PNG_EXPORT(png_voidp,png_get_user_chunk_ptr) PNGARG((png_structp |
| 1782 | png_ptr)); |
| 1783 | #endif |
| 1784 | |
Guy Schalnat | 4ee97b0 | 1996-01-16 01:51:56 -0600 | [diff] [blame] | 1785 | #ifdef PNG_PROGRESSIVE_READ_SUPPORTED |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 1786 | /* Sets the function callbacks for the push reader, and a pointer to a |
| 1787 | * user-defined structure available to the callback functions. |
| 1788 | */ |
| 1789 | extern PNG_EXPORT(void,png_set_progressive_read_fn) PNGARG((png_structp png_ptr, |
| 1790 | png_voidp progressive_ptr, |
Guy Schalnat | 4ee97b0 | 1996-01-16 01:51:56 -0600 | [diff] [blame] | 1791 | png_progressive_info_ptr info_fn, png_progressive_row_ptr row_fn, |
| 1792 | png_progressive_end_ptr end_fn)); |
Guy Schalnat | 6d76471 | 1995-12-19 03:22:19 -0600 | [diff] [blame] | 1793 | |
Guy Schalnat | 4ee97b0 | 1996-01-16 01:51:56 -0600 | [diff] [blame] | 1794 | /* returns the user pointer associated with the push read functions */ |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 1795 | extern PNG_EXPORT(png_voidp,png_get_progressive_ptr) |
| 1796 | PNGARG((png_structp png_ptr)); |
| 1797 | |
| 1798 | /* function to be called when data becomes available */ |
| 1799 | extern PNG_EXPORT(void,png_process_data) PNGARG((png_structp png_ptr, |
| 1800 | png_infop info_ptr, png_bytep buffer, png_size_t buffer_size)); |
| 1801 | |
Glenn Randers-Pehrson | 8686fff | 1998-05-21 09:27:50 -0500 | [diff] [blame] | 1802 | /* function that combines rows. Not very much different than the |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 1803 | * png_combine_row() call. Is this even used????? |
| 1804 | */ |
| 1805 | extern PNG_EXPORT(void,png_progressive_combine_row) PNGARG((png_structp png_ptr, |
| 1806 | png_bytep old_row, png_bytep new_row)); |
Guy Schalnat | 4ee97b0 | 1996-01-16 01:51:56 -0600 | [diff] [blame] | 1807 | #endif /* PNG_PROGRESSIVE_READ_SUPPORTED */ |
Guy Schalnat | 6d76471 | 1995-12-19 03:22:19 -0600 | [diff] [blame] | 1808 | |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 1809 | extern PNG_EXPORT(png_voidp,png_malloc) PNGARG((png_structp png_ptr, |
Guy Schalnat | 4ee97b0 | 1996-01-16 01:51:56 -0600 | [diff] [blame] | 1810 | png_uint_32 size)); |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 1811 | |
Glenn Randers-Pehrson | b6ce43d | 1998-01-01 07:13:13 -0600 | [diff] [blame] | 1812 | /* frees a pointer allocated by png_malloc() */ |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 1813 | extern PNG_EXPORT(void,png_free) PNGARG((png_structp png_ptr, png_voidp ptr)); |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 1814 | |
Glenn Randers-Pehrson | c1bfe68 | 2002-03-06 22:08:00 -0600 | [diff] [blame] | 1815 | /* Function to allocate memory for zlib. */ |
| 1816 | extern PNG_EXPORT(voidpf,png_zalloc) PNGARG((voidpf png_ptr, uInt items, |
| 1817 | uInt size)); |
| 1818 | |
| 1819 | /* Function to free memory for zlib */ |
| 1820 | extern PNG_EXPORT(void,png_zfree) PNGARG((voidpf png_ptr, voidpf ptr)); |
| 1821 | |
Glenn Randers-Pehrson | 38e6e77 | 2000-04-09 19:06:13 -0500 | [diff] [blame] | 1822 | /* Free data that was allocated internally */ |
Glenn Randers-Pehrson | a77ef62 | 2000-02-18 13:48:52 -0600 | [diff] [blame] | 1823 | extern PNG_EXPORT(void,png_free_data) PNGARG((png_structp png_ptr, |
| 1824 | png_infop info_ptr, png_uint_32 free_me, int num)); |
Glenn Randers-Pehrson | 6942d53 | 2000-05-01 09:31:54 -0500 | [diff] [blame] | 1825 | #ifdef PNG_FREE_ME_SUPPORTED |
Glenn Randers-Pehrson | 38e6e77 | 2000-04-09 19:06:13 -0500 | [diff] [blame] | 1826 | /* Reassign responsibility for freeing existing data, whether allocated |
| 1827 | * by libpng or by the application */ |
| 1828 | extern PNG_EXPORT(void,png_data_freer) PNGARG((png_structp png_ptr, |
| 1829 | png_infop info_ptr, int freer, png_uint_32 mask)); |
Glenn Randers-Pehrson | 6942d53 | 2000-05-01 09:31:54 -0500 | [diff] [blame] | 1830 | #endif |
Glenn Randers-Pehrson | 38e6e77 | 2000-04-09 19:06:13 -0500 | [diff] [blame] | 1831 | /* assignments for png_data_freer */ |
| 1832 | #define PNG_DESTROY_WILL_FREE_DATA 1 |
| 1833 | #define PNG_SET_WILL_FREE_DATA 1 |
| 1834 | #define PNG_USER_WILL_FREE_DATA 2 |
| 1835 | /* Flags for png_ptr->free_me and info_ptr->free_me */ |
Glenn Randers-Pehrson | a77ef62 | 2000-02-18 13:48:52 -0600 | [diff] [blame] | 1836 | #define PNG_FREE_HIST 0x0008 |
| 1837 | #define PNG_FREE_ICCP 0x0010 |
| 1838 | #define PNG_FREE_SPLT 0x0020 |
| 1839 | #define PNG_FREE_ROWS 0x0040 |
Glenn Randers-Pehrson | 1ef65b6 | 2000-05-12 06:19:53 -0500 | [diff] [blame] | 1840 | #define PNG_FREE_PCAL 0x0080 |
| 1841 | #define PNG_FREE_SCAL 0x0100 |
Glenn Randers-Pehrson | a77ef62 | 2000-02-18 13:48:52 -0600 | [diff] [blame] | 1842 | #define PNG_FREE_UNKN 0x0200 |
| 1843 | #define PNG_FREE_LIST 0x0400 |
Glenn Randers-Pehrson | 6942d53 | 2000-05-01 09:31:54 -0500 | [diff] [blame] | 1844 | #define PNG_FREE_PLTE 0x1000 |
| 1845 | #define PNG_FREE_TRNS 0x2000 |
| 1846 | #define PNG_FREE_TEXT 0x4000 |
Glenn Randers-Pehrson | 1ef65b6 | 2000-05-12 06:19:53 -0500 | [diff] [blame] | 1847 | #define PNG_FREE_ALL 0x7fff |
Glenn Randers-Pehrson | ec61c23 | 2000-05-16 06:17:36 -0500 | [diff] [blame] | 1848 | #define PNG_FREE_MUL 0x4220 /* PNG_FREE_SPLT|PNG_FREE_TEXT|PNG_FREE_UNKN */ |
Glenn Randers-Pehrson | a77ef62 | 2000-02-18 13:48:52 -0600 | [diff] [blame] | 1849 | |
Glenn Randers-Pehrson | f7d1a17 | 1998-06-06 15:31:35 -0500 | [diff] [blame] | 1850 | #ifdef PNG_USER_MEM_SUPPORTED |
| 1851 | extern PNG_EXPORT(png_voidp,png_malloc_default) PNGARG((png_structp png_ptr, |
| 1852 | png_uint_32 size)); |
| 1853 | extern PNG_EXPORT(void,png_free_default) PNGARG((png_structp png_ptr, |
| 1854 | png_voidp ptr)); |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame] | 1855 | #endif |
Glenn Randers-Pehrson | f7d1a17 | 1998-06-06 15:31:35 -0500 | [diff] [blame] | 1856 | |
Glenn Randers-Pehrson | a357b99 | 1998-02-08 20:56:40 -0600 | [diff] [blame] | 1857 | extern PNG_EXPORT(png_voidp,png_memcpy_check) PNGARG((png_structp png_ptr, |
Glenn Randers-Pehrson | 0f881d6 | 1998-02-07 10:20:57 -0600 | [diff] [blame] | 1858 | png_voidp s1, png_voidp s2, png_uint_32 size)); |
| 1859 | |
Glenn Randers-Pehrson | a357b99 | 1998-02-08 20:56:40 -0600 | [diff] [blame] | 1860 | extern PNG_EXPORT(png_voidp,png_memset_check) PNGARG((png_structp png_ptr, |
Glenn Randers-Pehrson | 0f881d6 | 1998-02-07 10:20:57 -0600 | [diff] [blame] | 1861 | png_voidp s1, int value, png_uint_32 size)); |
| 1862 | |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 1863 | #if defined(USE_FAR_KEYWORD) /* memory model conversion function */ |
Glenn Randers-Pehrson | a357b99 | 1998-02-08 20:56:40 -0600 | [diff] [blame] | 1864 | extern void *png_far_to_near PNGARG((png_structp png_ptr,png_voidp ptr, |
| 1865 | int check)); |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 1866 | #endif /* USE_FAR_KEYWORD */ |
| 1867 | |
| 1868 | /* Fatal error in PNG image of libpng - can't continue */ |
| 1869 | extern PNG_EXPORT(void,png_error) PNGARG((png_structp png_ptr, |
| 1870 | png_const_charp error)); |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 1871 | |
Glenn Randers-Pehrson | 70e3f54 | 1998-01-03 22:40:55 -0600 | [diff] [blame] | 1872 | /* The same, but the chunk name is prepended to the error string. */ |
| 1873 | extern PNG_EXPORT(void,png_chunk_error) PNGARG((png_structp png_ptr, |
| 1874 | png_const_charp error)); |
| 1875 | |
Guy Schalnat | 6d76471 | 1995-12-19 03:22:19 -0600 | [diff] [blame] | 1876 | /* Non-fatal error in libpng. Can continue, but may have a problem. */ |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 1877 | extern PNG_EXPORT(void,png_warning) PNGARG((png_structp png_ptr, |
| 1878 | png_const_charp message)); |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 1879 | |
Glenn Randers-Pehrson | 70e3f54 | 1998-01-03 22:40:55 -0600 | [diff] [blame] | 1880 | /* Non-fatal error in libpng, chunk name is prepended to message. */ |
| 1881 | extern PNG_EXPORT(void,png_chunk_warning) PNGARG((png_structp png_ptr, |
| 1882 | png_const_charp message)); |
| 1883 | |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 1884 | /* The png_set_<chunk> functions are for storing values in the png_info_struct. |
| 1885 | * Similarly, the png_get_<chunk> calls are used to read values from the |
| 1886 | * png_info_struct, either storing the parameters in the passed variables, or |
| 1887 | * setting pointers into the png_info_struct where the data is stored. The |
| 1888 | * png_get_<chunk> functions return a non-zero value if the data was available |
| 1889 | * in info_ptr, or return zero and do not change any of the parameters if the |
| 1890 | * data was not available. |
| 1891 | * |
| 1892 | * These functions should be used instead of directly accessing png_info |
| 1893 | * to avoid problems with future changes in the size and internal layout of |
| 1894 | * png_info_struct. |
| 1895 | */ |
Glenn Randers-Pehrson | 46f61e2 | 1998-01-30 21:45:12 -0600 | [diff] [blame] | 1896 | /* Returns "flag" if chunk data is valid in info_ptr. */ |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 1897 | extern PNG_EXPORT(png_uint_32,png_get_valid) PNGARG((png_structp png_ptr, |
| 1898 | png_infop info_ptr, png_uint_32 flag)); |
| 1899 | |
Glenn Randers-Pehrson | 46f61e2 | 1998-01-30 21:45:12 -0600 | [diff] [blame] | 1900 | /* Returns number of bytes needed to hold a transformed row. */ |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 1901 | extern PNG_EXPORT(png_uint_32,png_get_rowbytes) PNGARG((png_structp png_ptr, |
| 1902 | png_infop info_ptr)); |
| 1903 | |
Glenn Randers-Pehrson | a77ef62 | 2000-02-18 13:48:52 -0600 | [diff] [blame] | 1904 | #if defined(PNG_INFO_IMAGE_SUPPORTED) |
| 1905 | /* Returns row_pointers, which is an array of pointers to scanlines that was |
| 1906 | returned from png_read_png(). */ |
| 1907 | extern PNG_EXPORT(png_bytepp,png_get_rows) PNGARG((png_structp png_ptr, |
| 1908 | png_infop info_ptr)); |
| 1909 | /* Set row_pointers, which is an array of pointers to scanlines for use |
| 1910 | by png_write_png(). */ |
| 1911 | extern PNG_EXPORT(void,png_set_rows) PNGARG((png_structp png_ptr, |
| 1912 | png_infop info_ptr, png_bytepp row_pointers)); |
| 1913 | #endif |
| 1914 | |
Glenn Randers-Pehrson | 46f61e2 | 1998-01-30 21:45:12 -0600 | [diff] [blame] | 1915 | /* Returns number of color channels in image. */ |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 1916 | extern PNG_EXPORT(png_byte,png_get_channels) PNGARG((png_structp png_ptr, |
| 1917 | png_infop info_ptr)); |
| 1918 | |
Glenn Randers-Pehrson | 46f61e2 | 1998-01-30 21:45:12 -0600 | [diff] [blame] | 1919 | #ifdef PNG_EASY_ACCESS_SUPPORTED |
| 1920 | /* Returns image width in pixels. */ |
| 1921 | extern PNG_EXPORT(png_uint_32, png_get_image_width) PNGARG((png_structp |
| 1922 | png_ptr, png_infop info_ptr)); |
| 1923 | |
| 1924 | /* Returns image height in pixels. */ |
| 1925 | extern PNG_EXPORT(png_uint_32, png_get_image_height) PNGARG((png_structp |
| 1926 | png_ptr, png_infop info_ptr)); |
| 1927 | |
| 1928 | /* Returns image bit_depth. */ |
| 1929 | extern PNG_EXPORT(png_byte, png_get_bit_depth) PNGARG((png_structp |
| 1930 | png_ptr, png_infop info_ptr)); |
| 1931 | |
| 1932 | /* Returns image color_type. */ |
| 1933 | extern PNG_EXPORT(png_byte, png_get_color_type) PNGARG((png_structp |
| 1934 | png_ptr, png_infop info_ptr)); |
| 1935 | |
| 1936 | /* Returns image filter_type. */ |
| 1937 | extern PNG_EXPORT(png_byte, png_get_filter_type) PNGARG((png_structp |
| 1938 | png_ptr, png_infop info_ptr)); |
| 1939 | |
| 1940 | /* Returns image interlace_type. */ |
| 1941 | extern PNG_EXPORT(png_byte, png_get_interlace_type) PNGARG((png_structp |
| 1942 | png_ptr, png_infop info_ptr)); |
| 1943 | |
| 1944 | /* Returns image compression_type. */ |
| 1945 | extern PNG_EXPORT(png_byte, png_get_compression_type) PNGARG((png_structp |
| 1946 | png_ptr, png_infop info_ptr)); |
| 1947 | |
| 1948 | /* Returns image resolution in pixels per meter, from pHYs chunk data. */ |
| 1949 | extern PNG_EXPORT(png_uint_32, png_get_pixels_per_meter) PNGARG((png_structp |
| 1950 | png_ptr, png_infop info_ptr)); |
Glenn Randers-Pehrson | cbe52d8 | 1998-02-28 07:00:24 -0600 | [diff] [blame] | 1951 | extern PNG_EXPORT(png_uint_32, png_get_x_pixels_per_meter) PNGARG((png_structp |
| 1952 | png_ptr, png_infop info_ptr)); |
| 1953 | extern PNG_EXPORT(png_uint_32, png_get_y_pixels_per_meter) PNGARG((png_structp |
| 1954 | png_ptr, png_infop info_ptr)); |
Glenn Randers-Pehrson | 46f61e2 | 1998-01-30 21:45:12 -0600 | [diff] [blame] | 1955 | |
| 1956 | /* Returns pixel aspect ratio, computed from pHYs chunk data. */ |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame] | 1957 | #ifdef PNG_FLOATING_POINT_SUPPORTED |
Glenn Randers-Pehrson | 46f61e2 | 1998-01-30 21:45:12 -0600 | [diff] [blame] | 1958 | extern PNG_EXPORT(float, png_get_pixel_aspect_ratio) PNGARG((png_structp |
| 1959 | png_ptr, png_infop info_ptr)); |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame] | 1960 | #endif |
Glenn Randers-Pehrson | 46f61e2 | 1998-01-30 21:45:12 -0600 | [diff] [blame] | 1961 | |
| 1962 | /* Returns image x, y offset in pixels or microns, from oFFs chunk data. */ |
Glenn Randers-Pehrson | 104622b | 2000-05-29 08:58:03 -0500 | [diff] [blame] | 1963 | extern PNG_EXPORT(png_int_32, png_get_x_offset_pixels) PNGARG((png_structp |
Glenn Randers-Pehrson | 46f61e2 | 1998-01-30 21:45:12 -0600 | [diff] [blame] | 1964 | png_ptr, png_infop info_ptr)); |
Glenn Randers-Pehrson | 104622b | 2000-05-29 08:58:03 -0500 | [diff] [blame] | 1965 | extern PNG_EXPORT(png_int_32, png_get_y_offset_pixels) PNGARG((png_structp |
Glenn Randers-Pehrson | 46f61e2 | 1998-01-30 21:45:12 -0600 | [diff] [blame] | 1966 | png_ptr, png_infop info_ptr)); |
Glenn Randers-Pehrson | 104622b | 2000-05-29 08:58:03 -0500 | [diff] [blame] | 1967 | extern PNG_EXPORT(png_int_32, png_get_x_offset_microns) PNGARG((png_structp |
Glenn Randers-Pehrson | 46f61e2 | 1998-01-30 21:45:12 -0600 | [diff] [blame] | 1968 | png_ptr, png_infop info_ptr)); |
Glenn Randers-Pehrson | 104622b | 2000-05-29 08:58:03 -0500 | [diff] [blame] | 1969 | extern PNG_EXPORT(png_int_32, png_get_y_offset_microns) PNGARG((png_structp |
Glenn Randers-Pehrson | 46f61e2 | 1998-01-30 21:45:12 -0600 | [diff] [blame] | 1970 | png_ptr, png_infop info_ptr)); |
| 1971 | |
| 1972 | #endif /* PNG_EASY_ACCESS_SUPPORTED */ |
| 1973 | |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 1974 | /* Returns pointer to signature string read from PNG header */ |
| 1975 | extern PNG_EXPORT(png_bytep,png_get_signature) PNGARG((png_structp png_ptr, |
| 1976 | png_infop info_ptr)); |
| 1977 | |
Glenn Randers-Pehrson | 1909560 | 2001-03-14 07:08:39 -0600 | [diff] [blame] | 1978 | #if defined(PNG_bKGD_SUPPORTED) |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 1979 | extern PNG_EXPORT(png_uint_32,png_get_bKGD) PNGARG((png_structp png_ptr, |
| 1980 | png_infop info_ptr, png_color_16p *background)); |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame] | 1981 | #endif |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 1982 | |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame] | 1983 | #if defined(PNG_bKGD_SUPPORTED) |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 1984 | extern PNG_EXPORT(void,png_set_bKGD) PNGARG((png_structp png_ptr, |
| 1985 | png_infop info_ptr, png_color_16p background)); |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame] | 1986 | #endif |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 1987 | |
Glenn Randers-Pehrson | 1909560 | 2001-03-14 07:08:39 -0600 | [diff] [blame] | 1988 | #if defined(PNG_cHRM_SUPPORTED) |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame] | 1989 | #ifdef PNG_FLOATING_POINT_SUPPORTED |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 1990 | extern PNG_EXPORT(png_uint_32,png_get_cHRM) PNGARG((png_structp png_ptr, |
| 1991 | png_infop info_ptr, double *white_x, double *white_y, double *red_x, |
| 1992 | double *red_y, double *green_x, double *green_y, double *blue_x, |
| 1993 | double *blue_y)); |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame] | 1994 | #endif |
| 1995 | #ifdef PNG_FIXED_POINT_SUPPORTED |
| 1996 | extern PNG_EXPORT(png_uint_32,png_get_cHRM_fixed) PNGARG((png_structp png_ptr, |
Glenn Randers-Pehrson | 61c32d9 | 2000-02-04 23:40:16 -0600 | [diff] [blame] | 1997 | png_infop info_ptr, png_fixed_point *int_white_x, png_fixed_point |
| 1998 | *int_white_y, png_fixed_point *int_red_x, png_fixed_point *int_red_y, |
| 1999 | png_fixed_point *int_green_x, png_fixed_point *int_green_y, png_fixed_point |
| 2000 | *int_blue_x, png_fixed_point *int_blue_y)); |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame] | 2001 | #endif |
| 2002 | #endif |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 2003 | |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame] | 2004 | #if defined(PNG_cHRM_SUPPORTED) |
| 2005 | #ifdef PNG_FLOATING_POINT_SUPPORTED |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 2006 | extern PNG_EXPORT(void,png_set_cHRM) PNGARG((png_structp png_ptr, |
| 2007 | png_infop info_ptr, double white_x, double white_y, double red_x, |
| 2008 | double red_y, double green_x, double green_y, double blue_x, double blue_y)); |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame] | 2009 | #endif |
| 2010 | #ifdef PNG_FIXED_POINT_SUPPORTED |
| 2011 | extern PNG_EXPORT(void,png_set_cHRM_fixed) PNGARG((png_structp png_ptr, |
Glenn Randers-Pehrson | 61c32d9 | 2000-02-04 23:40:16 -0600 | [diff] [blame] | 2012 | png_infop info_ptr, png_fixed_point int_white_x, png_fixed_point int_white_y, |
| 2013 | png_fixed_point int_red_x, png_fixed_point int_red_y, png_fixed_point |
| 2014 | int_green_x, png_fixed_point int_green_y, png_fixed_point int_blue_x, |
| 2015 | png_fixed_point int_blue_y)); |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame] | 2016 | #endif |
| 2017 | #endif |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 2018 | |
Glenn Randers-Pehrson | 1909560 | 2001-03-14 07:08:39 -0600 | [diff] [blame] | 2019 | #if defined(PNG_gAMA_SUPPORTED) |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame] | 2020 | #ifdef PNG_FLOATING_POINT_SUPPORTED |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 2021 | extern PNG_EXPORT(png_uint_32,png_get_gAMA) PNGARG((png_structp png_ptr, |
| 2022 | png_infop info_ptr, double *file_gamma)); |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame] | 2023 | #endif |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame] | 2024 | extern PNG_EXPORT(png_uint_32,png_get_gAMA_fixed) PNGARG((png_structp png_ptr, |
Glenn Randers-Pehrson | 61c32d9 | 2000-02-04 23:40:16 -0600 | [diff] [blame] | 2025 | png_infop info_ptr, png_fixed_point *int_file_gamma)); |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame] | 2026 | #endif |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 2027 | |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame] | 2028 | #if defined(PNG_gAMA_SUPPORTED) |
| 2029 | #ifdef PNG_FLOATING_POINT_SUPPORTED |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 2030 | extern PNG_EXPORT(void,png_set_gAMA) PNGARG((png_structp png_ptr, |
| 2031 | png_infop info_ptr, double file_gamma)); |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame] | 2032 | #endif |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame] | 2033 | extern PNG_EXPORT(void,png_set_gAMA_fixed) PNGARG((png_structp png_ptr, |
Glenn Randers-Pehrson | 61c32d9 | 2000-02-04 23:40:16 -0600 | [diff] [blame] | 2034 | png_infop info_ptr, png_fixed_point int_file_gamma)); |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame] | 2035 | #endif |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 2036 | |
Glenn Randers-Pehrson | 1909560 | 2001-03-14 07:08:39 -0600 | [diff] [blame] | 2037 | #if defined(PNG_hIST_SUPPORTED) |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 2038 | extern PNG_EXPORT(png_uint_32,png_get_hIST) PNGARG((png_structp png_ptr, |
| 2039 | png_infop info_ptr, png_uint_16p *hist)); |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame] | 2040 | #endif |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 2041 | |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame] | 2042 | #if defined(PNG_hIST_SUPPORTED) |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 2043 | extern PNG_EXPORT(void,png_set_hIST) PNGARG((png_structp png_ptr, |
| 2044 | png_infop info_ptr, png_uint_16p hist)); |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame] | 2045 | #endif |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 2046 | |
| 2047 | extern PNG_EXPORT(png_uint_32,png_get_IHDR) PNGARG((png_structp png_ptr, |
| 2048 | png_infop info_ptr, png_uint_32 *width, png_uint_32 *height, |
Glenn Randers-Pehrson | 5e5c1e1 | 2000-11-10 12:26:19 -0600 | [diff] [blame] | 2049 | int *bit_depth, int *color_type, int *interlace_method, |
| 2050 | int *compression_method, int *filter_method)); |
Glenn Randers-Pehrson | 5c6aeb2 | 1998-12-29 11:47:59 -0600 | [diff] [blame] | 2051 | |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 2052 | extern PNG_EXPORT(void,png_set_IHDR) PNGARG((png_structp png_ptr, |
| 2053 | png_infop info_ptr, png_uint_32 width, png_uint_32 height, int bit_depth, |
Glenn Randers-Pehrson | 5e5c1e1 | 2000-11-10 12:26:19 -0600 | [diff] [blame] | 2054 | int color_type, int interlace_method, int compression_method, |
| 2055 | int filter_method)); |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 2056 | |
Glenn Randers-Pehrson | 1909560 | 2001-03-14 07:08:39 -0600 | [diff] [blame] | 2057 | #if defined(PNG_oFFs_SUPPORTED) |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 2058 | extern PNG_EXPORT(png_uint_32,png_get_oFFs) PNGARG((png_structp png_ptr, |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame] | 2059 | png_infop info_ptr, png_int_32 *offset_x, png_int_32 *offset_y, |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 2060 | int *unit_type)); |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame] | 2061 | #endif |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 2062 | |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame] | 2063 | #if defined(PNG_oFFs_SUPPORTED) |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 2064 | extern PNG_EXPORT(void,png_set_oFFs) PNGARG((png_structp png_ptr, |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame] | 2065 | png_infop info_ptr, png_int_32 offset_x, png_int_32 offset_y, |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 2066 | int unit_type)); |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame] | 2067 | #endif |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 2068 | |
Glenn Randers-Pehrson | 1909560 | 2001-03-14 07:08:39 -0600 | [diff] [blame] | 2069 | #if defined(PNG_pCAL_SUPPORTED) |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 2070 | extern PNG_EXPORT(png_uint_32,png_get_pCAL) PNGARG((png_structp png_ptr, |
| 2071 | png_infop info_ptr, png_charp *purpose, png_int_32 *X0, png_int_32 *X1, |
| 2072 | int *type, int *nparams, png_charp *units, png_charpp *params)); |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame] | 2073 | #endif |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 2074 | |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame] | 2075 | #if defined(PNG_pCAL_SUPPORTED) |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 2076 | extern PNG_EXPORT(void,png_set_pCAL) PNGARG((png_structp png_ptr, |
| 2077 | png_infop info_ptr, png_charp purpose, png_int_32 X0, png_int_32 X1, |
| 2078 | int type, int nparams, png_charp units, png_charpp params)); |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame] | 2079 | #endif |
| 2080 | |
Glenn Randers-Pehrson | 1909560 | 2001-03-14 07:08:39 -0600 | [diff] [blame] | 2081 | #if defined(PNG_pHYs_SUPPORTED) |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 2082 | extern PNG_EXPORT(png_uint_32,png_get_pHYs) PNGARG((png_structp png_ptr, |
| 2083 | png_infop info_ptr, png_uint_32 *res_x, png_uint_32 *res_y, int *unit_type)); |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame] | 2084 | #endif |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 2085 | |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame] | 2086 | #if defined(PNG_pHYs_SUPPORTED) |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 2087 | extern PNG_EXPORT(void,png_set_pHYs) PNGARG((png_structp png_ptr, |
| 2088 | png_infop info_ptr, png_uint_32 res_x, png_uint_32 res_y, int unit_type)); |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame] | 2089 | #endif |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 2090 | |
| 2091 | extern PNG_EXPORT(png_uint_32,png_get_PLTE) PNGARG((png_structp png_ptr, |
| 2092 | png_infop info_ptr, png_colorp *palette, int *num_palette)); |
| 2093 | |
| 2094 | extern PNG_EXPORT(void,png_set_PLTE) PNGARG((png_structp png_ptr, |
| 2095 | png_infop info_ptr, png_colorp palette, int num_palette)); |
| 2096 | |
Glenn Randers-Pehrson | 1909560 | 2001-03-14 07:08:39 -0600 | [diff] [blame] | 2097 | #if defined(PNG_sBIT_SUPPORTED) |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 2098 | extern PNG_EXPORT(png_uint_32,png_get_sBIT) PNGARG((png_structp png_ptr, |
| 2099 | png_infop info_ptr, png_color_8p *sig_bit)); |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame] | 2100 | #endif |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 2101 | |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame] | 2102 | #if defined(PNG_sBIT_SUPPORTED) |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 2103 | extern PNG_EXPORT(void,png_set_sBIT) PNGARG((png_structp png_ptr, |
| 2104 | png_infop info_ptr, png_color_8p sig_bit)); |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame] | 2105 | #endif |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 2106 | |
Glenn Randers-Pehrson | 1909560 | 2001-03-14 07:08:39 -0600 | [diff] [blame] | 2107 | #if defined(PNG_sRGB_SUPPORTED) |
Glenn Randers-Pehrson | b6ce43d | 1998-01-01 07:13:13 -0600 | [diff] [blame] | 2108 | extern PNG_EXPORT(png_uint_32,png_get_sRGB) PNGARG((png_structp png_ptr, |
Glenn Randers-Pehrson | c4a2ae6 | 1998-01-16 22:06:18 -0600 | [diff] [blame] | 2109 | png_infop info_ptr, int *intent)); |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame] | 2110 | #endif |
Glenn Randers-Pehrson | b6ce43d | 1998-01-01 07:13:13 -0600 | [diff] [blame] | 2111 | |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame] | 2112 | #if defined(PNG_sRGB_SUPPORTED) |
Glenn Randers-Pehrson | b6ce43d | 1998-01-01 07:13:13 -0600 | [diff] [blame] | 2113 | extern PNG_EXPORT(void,png_set_sRGB) PNGARG((png_structp png_ptr, |
Glenn Randers-Pehrson | c4a2ae6 | 1998-01-16 22:06:18 -0600 | [diff] [blame] | 2114 | png_infop info_ptr, int intent)); |
Glenn Randers-Pehrson | b6ce43d | 1998-01-01 07:13:13 -0600 | [diff] [blame] | 2115 | extern PNG_EXPORT(void,png_set_sRGB_gAMA_and_cHRM) PNGARG((png_structp png_ptr, |
Glenn Randers-Pehrson | c4a2ae6 | 1998-01-16 22:06:18 -0600 | [diff] [blame] | 2116 | png_infop info_ptr, int intent)); |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame] | 2117 | #endif |
Glenn Randers-Pehrson | b6ce43d | 1998-01-01 07:13:13 -0600 | [diff] [blame] | 2118 | |
Glenn Randers-Pehrson | 1909560 | 2001-03-14 07:08:39 -0600 | [diff] [blame] | 2119 | #if defined(PNG_iCCP_SUPPORTED) |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame] | 2120 | extern PNG_EXPORT(png_uint_32,png_get_iCCP) PNGARG((png_structp png_ptr, |
| 2121 | png_infop info_ptr, png_charpp name, int *compression_type, |
Glenn Randers-Pehrson | 61c32d9 | 2000-02-04 23:40:16 -0600 | [diff] [blame] | 2122 | png_charpp profile, png_uint_32 *proflen)); |
Glenn Randers-Pehrson | 2ad31ae | 2000-12-15 08:54:42 -0600 | [diff] [blame] | 2123 | /* Note to maintainer: profile should be png_bytepp */ |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame] | 2124 | #endif |
| 2125 | |
| 2126 | #if defined(PNG_iCCP_SUPPORTED) |
| 2127 | extern PNG_EXPORT(void,png_set_iCCP) PNGARG((png_structp png_ptr, |
| 2128 | png_infop info_ptr, png_charp name, int compression_type, |
Glenn Randers-Pehrson | 61c32d9 | 2000-02-04 23:40:16 -0600 | [diff] [blame] | 2129 | png_charp profile, png_uint_32 proflen)); |
Glenn Randers-Pehrson | 2ad31ae | 2000-12-15 08:54:42 -0600 | [diff] [blame] | 2130 | /* Note to maintainer: profile should be png_bytep */ |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame] | 2131 | #endif |
| 2132 | |
Glenn Randers-Pehrson | 1909560 | 2001-03-14 07:08:39 -0600 | [diff] [blame] | 2133 | #if defined(PNG_sPLT_SUPPORTED) |
Glenn Randers-Pehrson | a77ef62 | 2000-02-18 13:48:52 -0600 | [diff] [blame] | 2134 | extern PNG_EXPORT(png_uint_32,png_get_sPLT) PNGARG((png_structp png_ptr, |
Glenn Randers-Pehrson | 520a764 | 2000-03-21 05:13:06 -0600 | [diff] [blame] | 2135 | png_infop info_ptr, png_sPLT_tpp entries)); |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame] | 2136 | #endif |
| 2137 | |
| 2138 | #if defined(PNG_sPLT_SUPPORTED) |
Glenn Randers-Pehrson | a77ef62 | 2000-02-18 13:48:52 -0600 | [diff] [blame] | 2139 | extern PNG_EXPORT(void,png_set_sPLT) PNGARG((png_structp png_ptr, |
Glenn Randers-Pehrson | 520a764 | 2000-03-21 05:13:06 -0600 | [diff] [blame] | 2140 | png_infop info_ptr, png_sPLT_tp entries, int nentries)); |
Glenn Randers-Pehrson | 61c32d9 | 2000-02-04 23:40:16 -0600 | [diff] [blame] | 2141 | #endif |
| 2142 | |
Glenn Randers-Pehrson | 1909560 | 2001-03-14 07:08:39 -0600 | [diff] [blame] | 2143 | #if defined(PNG_TEXT_SUPPORTED) |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame] | 2144 | /* png_get_text also returns the number of text chunks in *num_text */ |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 2145 | extern PNG_EXPORT(png_uint_32,png_get_text) PNGARG((png_structp png_ptr, |
| 2146 | png_infop info_ptr, png_textp *text_ptr, int *num_text)); |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame] | 2147 | #endif |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 2148 | |
Glenn Randers-Pehrson | 4accabb | 2000-04-14 14:20:47 -0500 | [diff] [blame] | 2149 | /* |
| 2150 | * Note while png_set_text() will accept a structure whose text, |
| 2151 | * language, and translated keywords are NULL pointers, the structure |
| 2152 | * returned by png_get_text will always contain regular |
| 2153 | * zero-terminated C strings. They might be empty strings but |
| 2154 | * they will never be NULL pointers. |
| 2155 | */ |
| 2156 | |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame] | 2157 | #if defined(PNG_TEXT_SUPPORTED) |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 2158 | extern PNG_EXPORT(void,png_set_text) PNGARG((png_structp png_ptr, |
| 2159 | png_infop info_ptr, png_textp text_ptr, int num_text)); |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame] | 2160 | #endif |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 2161 | |
Glenn Randers-Pehrson | 1909560 | 2001-03-14 07:08:39 -0600 | [diff] [blame] | 2162 | #if defined(PNG_tIME_SUPPORTED) |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 2163 | extern PNG_EXPORT(png_uint_32,png_get_tIME) PNGARG((png_structp png_ptr, |
| 2164 | png_infop info_ptr, png_timep *mod_time)); |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame] | 2165 | #endif |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 2166 | |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame] | 2167 | #if defined(PNG_tIME_SUPPORTED) |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 2168 | extern PNG_EXPORT(void,png_set_tIME) PNGARG((png_structp png_ptr, |
| 2169 | png_infop info_ptr, png_timep mod_time)); |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame] | 2170 | #endif |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 2171 | |
Glenn Randers-Pehrson | 1909560 | 2001-03-14 07:08:39 -0600 | [diff] [blame] | 2172 | #if defined(PNG_tRNS_SUPPORTED) |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 2173 | extern PNG_EXPORT(png_uint_32,png_get_tRNS) PNGARG((png_structp png_ptr, |
| 2174 | png_infop info_ptr, png_bytep *trans, int *num_trans, |
| 2175 | png_color_16p *trans_values)); |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame] | 2176 | #endif |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 2177 | |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame] | 2178 | #if defined(PNG_tRNS_SUPPORTED) |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 2179 | extern PNG_EXPORT(void,png_set_tRNS) PNGARG((png_structp png_ptr, |
| 2180 | png_infop info_ptr, png_bytep trans, int num_trans, |
| 2181 | png_color_16p trans_values)); |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame] | 2182 | #endif |
| 2183 | |
Glenn Randers-Pehrson | 61c32d9 | 2000-02-04 23:40:16 -0600 | [diff] [blame] | 2184 | #if defined(PNG_tRNS_SUPPORTED) |
Glenn Randers-Pehrson | 61c32d9 | 2000-02-04 23:40:16 -0600 | [diff] [blame] | 2185 | #endif |
| 2186 | |
Glenn Randers-Pehrson | 1909560 | 2001-03-14 07:08:39 -0600 | [diff] [blame] | 2187 | #if defined(PNG_sCAL_SUPPORTED) |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame] | 2188 | #ifdef PNG_FLOATING_POINT_SUPPORTED |
| 2189 | extern PNG_EXPORT(png_uint_32,png_get_sCAL) PNGARG((png_structp png_ptr, |
Glenn Randers-Pehrson | 61c32d9 | 2000-02-04 23:40:16 -0600 | [diff] [blame] | 2190 | png_infop info_ptr, int *unit, double *width, double *height)); |
| 2191 | #else |
| 2192 | #ifdef PNG_FIXED_POINT_SUPPORTED |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame] | 2193 | extern PNG_EXPORT(png_uint_32,png_get_sCAL_s) PNGARG((png_structp png_ptr, |
Glenn Randers-Pehrson | 61c32d9 | 2000-02-04 23:40:16 -0600 | [diff] [blame] | 2194 | png_infop info_ptr, int *unit, png_charpp swidth, png_charpp sheight)); |
| 2195 | #endif |
| 2196 | #endif |
Glenn Randers-Pehrson | 1909560 | 2001-03-14 07:08:39 -0600 | [diff] [blame] | 2197 | #endif /* PNG_sCAL_SUPPORTED */ |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame] | 2198 | |
Glenn Randers-Pehrson | 61c32d9 | 2000-02-04 23:40:16 -0600 | [diff] [blame] | 2199 | #if defined(PNG_sCAL_SUPPORTED) |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame] | 2200 | #ifdef PNG_FLOATING_POINT_SUPPORTED |
| 2201 | extern PNG_EXPORT(void,png_set_sCAL) PNGARG((png_structp png_ptr, |
Glenn Randers-Pehrson | 61c32d9 | 2000-02-04 23:40:16 -0600 | [diff] [blame] | 2202 | png_infop info_ptr, int unit, double width, double height)); |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame] | 2203 | #endif |
Glenn Randers-Pehrson | 61c32d9 | 2000-02-04 23:40:16 -0600 | [diff] [blame] | 2204 | #ifdef PNG_FIXED_POINT_SUPPORTED |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame] | 2205 | extern PNG_EXPORT(void,png_set_sCAL_s) PNGARG((png_structp png_ptr, |
Glenn Randers-Pehrson | 61c32d9 | 2000-02-04 23:40:16 -0600 | [diff] [blame] | 2206 | png_infop info_ptr, int unit, png_charp swidth, png_charp sheight)); |
| 2207 | #endif |
Glenn Randers-Pehrson | 1909560 | 2001-03-14 07:08:39 -0600 | [diff] [blame] | 2208 | #endif /* PNG_sCAL_SUPPORTED || PNG_WRITE_sCAL_SUPPORTED */ |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame] | 2209 | |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame] | 2210 | #if defined(PNG_UNKNOWN_CHUNKS_SUPPORTED) |
Glenn Randers-Pehrson | 61c32d9 | 2000-02-04 23:40:16 -0600 | [diff] [blame] | 2211 | /* provide a list of chunks and how they are to be handled, if the built-in |
| 2212 | handling or default unknown chunk handling is not desired. Any chunks not |
| 2213 | listed will be handled in the default manner. The IHDR and IEND chunks |
| 2214 | must not be listed. |
| 2215 | keep = 0: follow default behavour |
| 2216 | = 1: do not keep |
| 2217 | = 2: keep only if safe-to-copy |
| 2218 | = 3: keep even if unsafe-to-copy |
| 2219 | */ |
| 2220 | extern PNG_EXPORT(void, png_set_keep_unknown_chunks) PNGARG((png_structp |
| 2221 | png_ptr, int keep, png_bytep chunk_list, int num_chunks)); |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame] | 2222 | extern PNG_EXPORT(void, png_set_unknown_chunks) PNGARG((png_structp png_ptr, |
Glenn Randers-Pehrson | 61c32d9 | 2000-02-04 23:40:16 -0600 | [diff] [blame] | 2223 | png_infop info_ptr, png_unknown_chunkp unknowns, int num_unknowns)); |
Glenn Randers-Pehrson | 228bd39 | 2000-04-23 23:14:02 -0500 | [diff] [blame] | 2224 | extern PNG_EXPORT(void, png_set_unknown_chunk_location) |
| 2225 | PNGARG((png_structp png_ptr, png_infop info_ptr, int chunk, int location)); |
Glenn Randers-Pehrson | 61c32d9 | 2000-02-04 23:40:16 -0600 | [diff] [blame] | 2226 | extern PNG_EXPORT(png_uint_32,png_get_unknown_chunks) PNGARG((png_structp |
| 2227 | png_ptr, png_infop info_ptr, png_unknown_chunkpp entries)); |
Glenn Randers-Pehrson | 61c32d9 | 2000-02-04 23:40:16 -0600 | [diff] [blame] | 2228 | #endif |
Glenn Randers-Pehrson | c1bfe68 | 2002-03-06 22:08:00 -0600 | [diff] [blame] | 2229 | #ifdef PNG_HANDLE_AS_UNKNOWN_SUPPORTED |
| 2230 | PNG_EXPORT(int,png_handle_as_unknown) PNGARG((png_structp png_ptr, png_bytep |
| 2231 | chunk_name)); |
| 2232 | #endif |
Glenn Randers-Pehrson | 61c32d9 | 2000-02-04 23:40:16 -0600 | [diff] [blame] | 2233 | |
Glenn Randers-Pehrson | fc4a143 | 2000-05-17 17:39:34 -0500 | [diff] [blame] | 2234 | /* Png_free_data() will turn off the "valid" flag for anything it frees. |
| 2235 | If you need to turn it off for a chunk that your application has freed, |
| 2236 | you can use png_set_invalid(png_ptr, info_ptr, PNG_INFO_CHNK); */ |
| 2237 | extern PNG_EXPORT(void, png_set_invalid) PNGARG((png_structp png_ptr, |
| 2238 | png_infop info_ptr, int mask)); |
| 2239 | |
Glenn Randers-Pehrson | 61c32d9 | 2000-02-04 23:40:16 -0600 | [diff] [blame] | 2240 | #if defined(PNG_INFO_IMAGE_SUPPORTED) |
Glenn Randers-Pehrson | 6942d53 | 2000-05-01 09:31:54 -0500 | [diff] [blame] | 2241 | /* The "params" pointer is currently not used and is for future expansion. */ |
Glenn Randers-Pehrson | 61c32d9 | 2000-02-04 23:40:16 -0600 | [diff] [blame] | 2242 | extern PNG_EXPORT(void, png_read_png) PNGARG((png_structp png_ptr, |
| 2243 | png_infop info_ptr, |
| 2244 | int transforms, |
Glenn Randers-Pehrson | 5e5c1e1 | 2000-11-10 12:26:19 -0600 | [diff] [blame] | 2245 | png_voidp params)); |
Glenn Randers-Pehrson | 61c32d9 | 2000-02-04 23:40:16 -0600 | [diff] [blame] | 2246 | extern PNG_EXPORT(void, png_write_png) PNGARG((png_structp png_ptr, |
| 2247 | png_infop info_ptr, |
| 2248 | int transforms, |
Glenn Randers-Pehrson | 5e5c1e1 | 2000-11-10 12:26:19 -0600 | [diff] [blame] | 2249 | png_voidp params)); |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame] | 2250 | #endif |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 2251 | |
| 2252 | /* Define PNG_DEBUG at compile time for debugging information. Higher |
| 2253 | * numbers for PNG_DEBUG mean more debugging information. This has |
| 2254 | * only been added since version 0.95 so it is not implemented throughout |
| 2255 | * libpng yet, but more support will be added as needed. |
| 2256 | */ |
Glenn Randers-Pehrson | 5c6aeb2 | 1998-12-29 11:47:59 -0600 | [diff] [blame] | 2257 | #ifdef PNG_DEBUG |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 2258 | #if (PNG_DEBUG > 0) |
Glenn Randers-Pehrson | 1ef65b6 | 2000-05-12 06:19:53 -0500 | [diff] [blame] | 2259 | #if !defined(PNG_DEBUG_FILE) && defined(_MSC_VER) |
| 2260 | #include <crtdbg.h> |
Glenn Randers-Pehrson | 4766a24 | 2000-07-17 06:17:09 -0500 | [diff] [blame] | 2261 | #if (PNG_DEBUG > 1) |
| 2262 | #define png_debug(l,m) _RPT0(_CRT_WARN,m) |
| 2263 | #define png_debug1(l,m,p1) _RPT1(_CRT_WARN,m,p1) |
| 2264 | #define png_debug2(l,m,p1,p2) _RPT2(_CRT_WARN,m,p1,p2) |
| 2265 | #endif |
Glenn Randers-Pehrson | 1ef65b6 | 2000-05-12 06:19:53 -0500 | [diff] [blame] | 2266 | #else /* PNG_DEBUG_FILE || !_MSC_VER */ |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 2267 | #ifndef PNG_DEBUG_FILE |
| 2268 | #define PNG_DEBUG_FILE stderr |
| 2269 | #endif /* PNG_DEBUG_FILE */ |
Glenn Randers-Pehrson | 4766a24 | 2000-07-17 06:17:09 -0500 | [diff] [blame] | 2270 | #if (PNG_DEBUG > 1) |
Glenn Randers-Pehrson | 1ef65b6 | 2000-05-12 06:19:53 -0500 | [diff] [blame] | 2271 | #define png_debug(l,m) \ |
Glenn Randers-Pehrson | 4766a24 | 2000-07-17 06:17:09 -0500 | [diff] [blame] | 2272 | { \ |
| 2273 | int num_tabs=l; \ |
| 2274 | fprintf(PNG_DEBUG_FILE,"%s"m,(num_tabs==1 ? "\t" : \ |
| 2275 | (num_tabs==2 ? "\t\t":(num_tabs>2 ? "\t\t\t":"")))); \ |
| 2276 | } |
Glenn Randers-Pehrson | 1ef65b6 | 2000-05-12 06:19:53 -0500 | [diff] [blame] | 2277 | #define png_debug1(l,m,p1) \ |
Glenn Randers-Pehrson | 4766a24 | 2000-07-17 06:17:09 -0500 | [diff] [blame] | 2278 | { \ |
| 2279 | int num_tabs=l; \ |
| 2280 | fprintf(PNG_DEBUG_FILE,"%s"m,(num_tabs==1 ? "\t" : \ |
| 2281 | (num_tabs==2 ? "\t\t":(num_tabs>2 ? "\t\t\t":""))),p1); \ |
| 2282 | } |
Glenn Randers-Pehrson | 1ef65b6 | 2000-05-12 06:19:53 -0500 | [diff] [blame] | 2283 | #define png_debug2(l,m,p1,p2) \ |
Glenn Randers-Pehrson | 4766a24 | 2000-07-17 06:17:09 -0500 | [diff] [blame] | 2284 | { \ |
| 2285 | int num_tabs=l; \ |
| 2286 | fprintf(PNG_DEBUG_FILE,"%s"m,(num_tabs==1 ? "\t" : \ |
| 2287 | (num_tabs==2 ? "\t\t":(num_tabs>2 ? "\t\t\t":""))),p1,p2); \ |
| 2288 | } |
| 2289 | #endif /* (PNG_DEBUG > 1) */ |
Glenn Randers-Pehrson | 1ef65b6 | 2000-05-12 06:19:53 -0500 | [diff] [blame] | 2290 | #endif /* _MSC_VER */ |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 2291 | #endif /* (PNG_DEBUG > 0) */ |
Glenn Randers-Pehrson | 5c6aeb2 | 1998-12-29 11:47:59 -0600 | [diff] [blame] | 2292 | #endif /* PNG_DEBUG */ |
| 2293 | #ifndef png_debug |
| 2294 | #define png_debug(l, m) |
| 2295 | #endif |
| 2296 | #ifndef png_debug1 |
| 2297 | #define png_debug1(l, m, p1) |
| 2298 | #endif |
| 2299 | #ifndef png_debug2 |
| 2300 | #define png_debug2(l, m, p1, p2) |
| 2301 | #endif |
| 2302 | |
Glenn Randers-Pehrson | 81fdf8a | 2000-04-07 10:34:56 -0500 | [diff] [blame] | 2303 | extern PNG_EXPORT(png_bytep,png_sig_bytes) PNGARG((void)); |
Glenn Randers-Pehrson | 5379b24 | 1999-11-27 10:22:33 -0600 | [diff] [blame] | 2304 | |
Glenn Randers-Pehrson | 5c6aeb2 | 1998-12-29 11:47:59 -0600 | [diff] [blame] | 2305 | extern PNG_EXPORT(png_charp,png_get_copyright) PNGARG((png_structp png_ptr)); |
Glenn Randers-Pehrson | 5379b24 | 1999-11-27 10:22:33 -0600 | [diff] [blame] | 2306 | extern PNG_EXPORT(png_charp,png_get_header_ver) PNGARG((png_structp png_ptr)); |
Glenn Randers-Pehrson | 5c6aeb2 | 1998-12-29 11:47:59 -0600 | [diff] [blame] | 2307 | extern PNG_EXPORT(png_charp,png_get_header_version) PNGARG((png_structp png_ptr)); |
Glenn Randers-Pehrson | 5379b24 | 1999-11-27 10:22:33 -0600 | [diff] [blame] | 2308 | extern PNG_EXPORT(png_charp,png_get_libpng_ver) PNGARG((png_structp png_ptr)); |
Glenn Randers-Pehrson | c944229 | 1999-01-06 21:50:16 -0600 | [diff] [blame] | 2309 | |
Glenn Randers-Pehrson | 5e5c1e1 | 2000-11-10 12:26:19 -0600 | [diff] [blame] | 2310 | #ifdef PNG_MNG_FEATURES_SUPPORTED |
| 2311 | extern PNG_EXPORT(png_uint_32,png_permit_mng_features) PNGARG((png_structp |
| 2312 | png_ptr, png_uint_32 mng_features_permitted)); |
| 2313 | #endif |
| 2314 | |
Glenn Randers-Pehrson | 1fd5fb3 | 2001-05-06 05:34:26 -0500 | [diff] [blame] | 2315 | /* Added to version 1.2.0 */ |
| 2316 | #if defined(PNG_ASSEMBLER_CODE_SUPPORTED) |
| 2317 | #define PNG_ASM_FLAG_MMX_SUPPORT_COMPILED 0x01 /* not user-settable */ |
| 2318 | #define PNG_ASM_FLAG_MMX_SUPPORT_IN_CPU 0x02 /* not user-settable */ |
| 2319 | #define PNG_ASM_FLAG_MMX_READ_COMBINE_ROW 0x04 |
| 2320 | #define PNG_ASM_FLAG_MMX_READ_INTERLACE 0x08 |
| 2321 | #define PNG_ASM_FLAG_MMX_READ_FILTER_SUB 0x10 |
| 2322 | #define PNG_ASM_FLAG_MMX_READ_FILTER_UP 0x20 |
| 2323 | #define PNG_ASM_FLAG_MMX_READ_FILTER_AVG 0x40 |
| 2324 | #define PNG_ASM_FLAG_MMX_READ_FILTER_PAETH 0x80 |
| 2325 | #define PNG_ASM_FLAGS_INITIALIZED 0x80000000 /* not user-settable */ |
| 2326 | |
| 2327 | #define PNG_MMX_READ_FLAGS ( PNG_ASM_FLAG_MMX_READ_COMBINE_ROW \ |
| 2328 | | PNG_ASM_FLAG_MMX_READ_INTERLACE \ |
| 2329 | | PNG_ASM_FLAG_MMX_READ_FILTER_SUB \ |
| 2330 | | PNG_ASM_FLAG_MMX_READ_FILTER_UP \ |
| 2331 | | PNG_ASM_FLAG_MMX_READ_FILTER_AVG \ |
| 2332 | | PNG_ASM_FLAG_MMX_READ_FILTER_PAETH ) |
| 2333 | #define PNG_MMX_WRITE_FLAGS ( 0 ) |
| 2334 | |
| 2335 | #define PNG_MMX_FLAGS ( PNG_ASM_FLAG_MMX_SUPPORT_COMPILED \ |
| 2336 | | PNG_ASM_FLAG_MMX_SUPPORT_IN_CPU \ |
| 2337 | | PNG_MMX_READ_FLAGS \ |
| 2338 | | PNG_MMX_WRITE_FLAGS ) |
| 2339 | |
| 2340 | #define PNG_SELECT_READ 1 |
| 2341 | #define PNG_SELECT_WRITE 2 |
| 2342 | |
| 2343 | |
Glenn Randers-Pehrson | 377657d | 2002-03-08 01:31:27 -0600 | [diff] [blame] | 2344 | #if !defined(PNG_1_0_X) |
Glenn Randers-Pehrson | 1fd5fb3 | 2001-05-06 05:34:26 -0500 | [diff] [blame] | 2345 | /* pngget.c */ |
| 2346 | extern PNG_EXPORT(png_uint_32,png_get_mmx_flagmask) |
| 2347 | PNGARG((int flag_select, int *compilerID)); |
| 2348 | |
| 2349 | /* pngget.c */ |
| 2350 | extern PNG_EXPORT(png_uint_32,png_get_asm_flagmask) |
| 2351 | PNGARG((int flag_select)); |
| 2352 | |
| 2353 | /* pngget.c */ |
| 2354 | extern PNG_EXPORT(png_uint_32,png_get_asm_flags) |
| 2355 | PNGARG((png_structp png_ptr)); |
| 2356 | |
| 2357 | /* pngget.c */ |
| 2358 | extern PNG_EXPORT(png_byte,png_get_mmx_bitdepth_threshold) |
| 2359 | PNGARG((png_structp png_ptr)); |
| 2360 | |
| 2361 | /* pngget.c */ |
| 2362 | extern PNG_EXPORT(png_uint_32,png_get_mmx_rowbytes_threshold) |
| 2363 | PNGARG((png_structp png_ptr)); |
| 2364 | |
| 2365 | /* pngset.c */ |
| 2366 | extern PNG_EXPORT(void,png_set_asm_flags) |
| 2367 | PNGARG((png_structp png_ptr, png_uint_32 asm_flags)); |
| 2368 | |
| 2369 | /* pngset.c */ |
| 2370 | extern PNG_EXPORT(void,png_set_mmx_thresholds) |
| 2371 | PNGARG((png_structp png_ptr, png_byte mmx_bitdepth_threshold, |
| 2372 | png_uint_32 mmx_rowbytes_threshold)); |
| 2373 | |
Glenn Randers-Pehrson | 377657d | 2002-03-08 01:31:27 -0600 | [diff] [blame] | 2374 | #endif /* PNG_1_0_X */ |
Glenn Randers-Pehrson | 1fd5fb3 | 2001-05-06 05:34:26 -0500 | [diff] [blame] | 2375 | #endif /* PNG_ASSEMBLER_CODE_SUPPORTED */ |
| 2376 | |
Glenn Randers-Pehrson | 73d57cb | 2002-03-25 18:49:08 -0600 | [diff] [blame] | 2377 | #if !defined(PNG_1_0_X) |
Glenn Randers-Pehrson | 231e687 | 2001-01-12 15:13:06 -0600 | [diff] [blame] | 2378 | /* png.c, pnggccrd.c, or pngvcrd.c */ |
| 2379 | extern PNG_EXPORT(int,png_mmx_support) PNGARG((void)); |
Glenn Randers-Pehrson | e68f5a3 | 2001-05-14 09:20:53 -0500 | [diff] [blame] | 2380 | |
| 2381 | /* Strip the prepended error numbers ("#nnn ") from error and warning |
| 2382 | * messages before passing them to the error or warning handler. */ |
| 2383 | #ifdef PNG_ERROR_NUMBERS_SUPPORTED |
| 2384 | extern PNG_EXPORT(void,png_set_strip_error_numbers) PNGARG((png_structp |
| 2385 | png_ptr, png_uint_32 strip_mode)); |
Glenn Randers-Pehrson | be9de0f | 2001-01-22 08:52:16 -0600 | [diff] [blame] | 2386 | #endif |
Glenn Randers-Pehrson | 73d57cb | 2002-03-25 18:49:08 -0600 | [diff] [blame] | 2387 | #endif /* PNG_1_0_X */ |
Glenn Randers-Pehrson | 231e687 | 2001-01-12 15:13:06 -0600 | [diff] [blame] | 2388 | |
Glenn Randers-Pehrson | cdf140b | 2001-01-15 12:22:32 -0600 | [diff] [blame] | 2389 | /* Maintainer: Put new public prototypes here ^, in libpng.3, and project defs */ |
Glenn Randers-Pehrson | 231e687 | 2001-01-12 15:13:06 -0600 | [diff] [blame] | 2390 | |
Glenn Randers-Pehrson | 61c32d9 | 2000-02-04 23:40:16 -0600 | [diff] [blame] | 2391 | #define PNG_HEADER_VERSION_STRING \ |
Glenn Randers-Pehrson | 25228ab | 2002-03-31 07:33:55 -0600 | [diff] [blame^] | 2392 | " libpng version 1.2.2beta6 - March 31, 2002 (header)\n" |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 2393 | |
Glenn Randers-Pehrson | 1d96361 | 1998-05-02 12:52:25 -0500 | [diff] [blame] | 2394 | #ifdef PNG_READ_COMPOSITE_NODIV_SUPPORTED |
Glenn Randers-Pehrson | 8686fff | 1998-05-21 09:27:50 -0500 | [diff] [blame] | 2395 | /* With these routines we avoid an integer divide, which will be slower on |
| 2396 | * most machines. However, it does take more operations than the corresponding |
| 2397 | * divide method, so it may be slower on a few RISC systems. There are two |
Glenn Randers-Pehrson | 1d96361 | 1998-05-02 12:52:25 -0500 | [diff] [blame] | 2398 | * shifts (by 8 or 16 bits) and an addition, versus a single integer divide. |
| 2399 | * |
| 2400 | * Note that the rounding factors are NOT supposed to be the same! 128 and |
| 2401 | * 32768 are correct for the NODIV code; 127 and 32767 are correct for the |
| 2402 | * standard method. |
| 2403 | * |
| 2404 | * [Optimized code by Greg Roelofs and Mark Adler...blame us for bugs. :-) ] |
| 2405 | */ |
| 2406 | |
Glenn Randers-Pehrson | 5c6aeb2 | 1998-12-29 11:47:59 -0600 | [diff] [blame] | 2407 | /* fg and bg should be in `gamma 1.0' space; alpha is the opacity */ |
| 2408 | |
| 2409 | # define png_composite(composite, fg, alpha, bg) \ |
Glenn Randers-Pehrson | 860ab2b | 1999-10-14 07:43:10 -0500 | [diff] [blame] | 2410 | { png_uint_16 temp = (png_uint_16)((png_uint_16)(fg) * (png_uint_16)(alpha) \ |
| 2411 | + (png_uint_16)(bg)*(png_uint_16)(255 - \ |
Glenn Randers-Pehrson | 5c6aeb2 | 1998-12-29 11:47:59 -0600 | [diff] [blame] | 2412 | (png_uint_16)(alpha)) + (png_uint_16)128); \ |
Glenn Randers-Pehrson | 1d96361 | 1998-05-02 12:52:25 -0500 | [diff] [blame] | 2413 | (composite) = (png_byte)((temp + (temp >> 8)) >> 8); } |
Glenn Randers-Pehrson | 5c6aeb2 | 1998-12-29 11:47:59 -0600 | [diff] [blame] | 2414 | |
| 2415 | # define png_composite_16(composite, fg, alpha, bg) \ |
Glenn Randers-Pehrson | 860ab2b | 1999-10-14 07:43:10 -0500 | [diff] [blame] | 2416 | { png_uint_32 temp = (png_uint_32)((png_uint_32)(fg) * (png_uint_32)(alpha) \ |
| 2417 | + (png_uint_32)(bg)*(png_uint_32)(65535L - \ |
Glenn Randers-Pehrson | 5c6aeb2 | 1998-12-29 11:47:59 -0600 | [diff] [blame] | 2418 | (png_uint_32)(alpha)) + (png_uint_32)32768L); \ |
Glenn Randers-Pehrson | 1d96361 | 1998-05-02 12:52:25 -0500 | [diff] [blame] | 2419 | (composite) = (png_uint_16)((temp + (temp >> 16)) >> 16); } |
| 2420 | |
| 2421 | #else /* standard method using integer division */ |
| 2422 | |
Glenn Randers-Pehrson | 5c6aeb2 | 1998-12-29 11:47:59 -0600 | [diff] [blame] | 2423 | # define png_composite(composite, fg, alpha, bg) \ |
| 2424 | (composite) = (png_byte)(((png_uint_16)(fg) * (png_uint_16)(alpha) + \ |
| 2425 | (png_uint_16)(bg) * (png_uint_16)(255 - (png_uint_16)(alpha)) + \ |
Glenn Randers-Pehrson | 1d96361 | 1998-05-02 12:52:25 -0500 | [diff] [blame] | 2426 | (png_uint_16)127) / 255) |
Glenn Randers-Pehrson | 5c6aeb2 | 1998-12-29 11:47:59 -0600 | [diff] [blame] | 2427 | |
| 2428 | # define png_composite_16(composite, fg, alpha, bg) \ |
Glenn Randers-Pehrson | 1d96361 | 1998-05-02 12:52:25 -0500 | [diff] [blame] | 2429 | (composite) = (png_uint_16)(((png_uint_32)(fg) * (png_uint_32)(alpha) + \ |
Glenn Randers-Pehrson | 5c6aeb2 | 1998-12-29 11:47:59 -0600 | [diff] [blame] | 2430 | (png_uint_32)(bg)*(png_uint_32)(65535L - (png_uint_32)(alpha)) + \ |
Glenn Randers-Pehrson | 1d96361 | 1998-05-02 12:52:25 -0500 | [diff] [blame] | 2431 | (png_uint_32)32767) / (png_uint_32)65535L) |
| 2432 | |
| 2433 | #endif /* PNG_READ_COMPOSITE_NODIV_SUPPORTED */ |
| 2434 | |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 2435 | /* These next functions are used internally in the code. They generally |
| 2436 | * shouldn't be used unless you are writing code to add or replace some |
| 2437 | * functionality in libpng. More information about most functions can |
| 2438 | * be found in the files where the functions are located. |
| 2439 | */ |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 2440 | |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 2441 | #if defined(PNG_INTERNAL) |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 2442 | |
Andreas Dilger | 02ad0ef | 1997-01-17 01:34:35 -0600 | [diff] [blame] | 2443 | /* Various modes of operation. Note that after an init, mode is set to |
Glenn Randers-Pehrson | b6ce43d | 1998-01-01 07:13:13 -0600 | [diff] [blame] | 2444 | * zero automatically when the structure is created. |
| 2445 | */ |
Glenn Randers-Pehrson | 5379b24 | 1999-11-27 10:22:33 -0600 | [diff] [blame] | 2446 | #define PNG_HAVE_IHDR 0x01 |
| 2447 | #define PNG_HAVE_PLTE 0x02 |
| 2448 | #define PNG_HAVE_IDAT 0x04 |
| 2449 | #define PNG_AFTER_IDAT 0x08 |
| 2450 | #define PNG_HAVE_IEND 0x10 |
| 2451 | #define PNG_HAVE_gAMA 0x20 |
| 2452 | #define PNG_HAVE_cHRM 0x40 |
| 2453 | #define PNG_HAVE_sRGB 0x80 |
| 2454 | #define PNG_HAVE_CHUNK_HEADER 0x100 |
| 2455 | #define PNG_WROTE_tIME 0x200 |
| 2456 | #define PNG_WROTE_INFO_BEFORE_PLTE 0x400 |
| 2457 | #define PNG_BACKGROUND_IS_GRAY 0x800 |
Glenn Randers-Pehrson | 408b421 | 2000-12-18 09:33:57 -0600 | [diff] [blame] | 2458 | #define PNG_HAVE_PNG_SIGNATURE 0x1000 |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 2459 | |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 2460 | /* flags for the transformations the PNG library does on the image data */ |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 2461 | #define PNG_BGR 0x0001 |
| 2462 | #define PNG_INTERLACE 0x0002 |
| 2463 | #define PNG_PACK 0x0004 |
| 2464 | #define PNG_SHIFT 0x0008 |
| 2465 | #define PNG_SWAP_BYTES 0x0010 |
| 2466 | #define PNG_INVERT_MONO 0x0020 |
| 2467 | #define PNG_DITHER 0x0040 |
| 2468 | #define PNG_BACKGROUND 0x0080 |
| 2469 | #define PNG_BACKGROUND_EXPAND 0x0100 |
Glenn Randers-Pehrson | 5c6aeb2 | 1998-12-29 11:47:59 -0600 | [diff] [blame] | 2470 | /* 0x0200 unused */ |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 2471 | #define PNG_16_TO_8 0x0400 |
| 2472 | #define PNG_RGBA 0x0800 |
| 2473 | #define PNG_EXPAND 0x1000 |
| 2474 | #define PNG_GAMMA 0x2000 |
| 2475 | #define PNG_GRAY_TO_RGB 0x4000 |
Glenn Randers-Pehrson | 61c32d9 | 2000-02-04 23:40:16 -0600 | [diff] [blame] | 2476 | #define PNG_FILLER 0x8000L |
Glenn Randers-Pehrson | 397100e | 1998-03-07 19:45:37 -0600 | [diff] [blame] | 2477 | #define PNG_PACKSWAP 0x10000L |
Glenn Randers-Pehrson | 0f881d6 | 1998-02-07 10:20:57 -0600 | [diff] [blame] | 2478 | #define PNG_SWAP_ALPHA 0x20000L |
| 2479 | #define PNG_STRIP_ALPHA 0x40000L |
| 2480 | #define PNG_INVERT_ALPHA 0x80000L |
Glenn Randers-Pehrson | 397100e | 1998-03-07 19:45:37 -0600 | [diff] [blame] | 2481 | #define PNG_USER_TRANSFORM 0x100000L |
Glenn Randers-Pehrson | 5c6aeb2 | 1998-12-29 11:47:59 -0600 | [diff] [blame] | 2482 | #define PNG_RGB_TO_GRAY_ERR 0x200000L |
| 2483 | #define PNG_RGB_TO_GRAY_WARN 0x400000L |
| 2484 | #define PNG_RGB_TO_GRAY 0x600000L /* two bits, RGB_TO_GRAY_ERR|WARN */ |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 2485 | |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 2486 | /* flags for png_create_struct */ |
| 2487 | #define PNG_STRUCT_PNG 0x0001 |
| 2488 | #define PNG_STRUCT_INFO 0x0002 |
| 2489 | |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 2490 | /* Scaling factor for filter heuristic weighting calculations */ |
| 2491 | #define PNG_WEIGHT_SHIFT 8 |
| 2492 | #define PNG_WEIGHT_FACTOR (1<<(PNG_WEIGHT_SHIFT)) |
| 2493 | #define PNG_COST_SHIFT 3 |
| 2494 | #define PNG_COST_FACTOR (1<<(PNG_COST_SHIFT)) |
| 2495 | |
| 2496 | /* flags for the png_ptr->flags rather than declaring a byte for each one */ |
Andreas Dilger | 02ad0ef | 1997-01-17 01:34:35 -0600 | [diff] [blame] | 2497 | #define PNG_FLAG_ZLIB_CUSTOM_STRATEGY 0x0001 |
| 2498 | #define PNG_FLAG_ZLIB_CUSTOM_LEVEL 0x0002 |
| 2499 | #define PNG_FLAG_ZLIB_CUSTOM_MEM_LEVEL 0x0004 |
| 2500 | #define PNG_FLAG_ZLIB_CUSTOM_WINDOW_BITS 0x0008 |
| 2501 | #define PNG_FLAG_ZLIB_CUSTOM_METHOD 0x0010 |
| 2502 | #define PNG_FLAG_ZLIB_FINISHED 0x0020 |
| 2503 | #define PNG_FLAG_ROW_INIT 0x0040 |
| 2504 | #define PNG_FLAG_FILLER_AFTER 0x0080 |
| 2505 | #define PNG_FLAG_CRC_ANCILLARY_USE 0x0100 |
| 2506 | #define PNG_FLAG_CRC_ANCILLARY_NOWARN 0x0200 |
| 2507 | #define PNG_FLAG_CRC_CRITICAL_USE 0x0400 |
| 2508 | #define PNG_FLAG_CRC_CRITICAL_IGNORE 0x0800 |
Glenn Randers-Pehrson | 6942d53 | 2000-05-01 09:31:54 -0500 | [diff] [blame] | 2509 | #define PNG_FLAG_FREE_PLTE 0x1000 |
| 2510 | #define PNG_FLAG_FREE_TRNS 0x2000 |
| 2511 | #define PNG_FLAG_FREE_HIST 0x4000 |
| 2512 | #define PNG_FLAG_KEEP_UNKNOWN_CHUNKS 0x8000L |
| 2513 | #define PNG_FLAG_KEEP_UNSAFE_CHUNKS 0x10000L |
Glenn Randers-Pehrson | 7529457 | 2000-05-06 14:09:57 -0500 | [diff] [blame] | 2514 | #define PNG_FLAG_LIBRARY_MISMATCH 0x20000L |
Glenn Randers-Pehrson | e68f5a3 | 2001-05-14 09:20:53 -0500 | [diff] [blame] | 2515 | #define PNG_FLAG_STRIP_ERROR_NUMBERS 0x40000L |
| 2516 | #define PNG_FLAG_STRIP_ERROR_TEXT 0x80000L |
Glenn Randers-Pehrson | 9c0f094 | 2002-02-21 23:14:23 -0600 | [diff] [blame] | 2517 | #define PNG_FLAG_MALLOC_NULL_MEM_OK 0x100000L |
Glenn Randers-Pehrson | 5379b24 | 1999-11-27 10:22:33 -0600 | [diff] [blame] | 2518 | |
Glenn Randers-Pehrson | 61c32d9 | 2000-02-04 23:40:16 -0600 | [diff] [blame] | 2519 | /* For use in png_set_keep_unknown, png_handle_as_unknown */ |
| 2520 | #define HANDLE_CHUNK_AS_DEFAULT 0 |
| 2521 | #define HANDLE_CHUNK_NEVER 1 |
| 2522 | #define HANDLE_CHUNK_IF_SAFE 2 |
| 2523 | #define HANDLE_CHUNK_ALWAYS 3 |
Andreas Dilger | 02ad0ef | 1997-01-17 01:34:35 -0600 | [diff] [blame] | 2524 | |
| 2525 | #define PNG_FLAG_CRC_ANCILLARY_MASK (PNG_FLAG_CRC_ANCILLARY_USE | \ |
| 2526 | PNG_FLAG_CRC_ANCILLARY_NOWARN) |
| 2527 | |
| 2528 | #define PNG_FLAG_CRC_CRITICAL_MASK (PNG_FLAG_CRC_CRITICAL_USE | \ |
| 2529 | PNG_FLAG_CRC_CRITICAL_IGNORE) |
| 2530 | |
| 2531 | #define PNG_FLAG_CRC_MASK (PNG_FLAG_CRC_ANCILLARY_MASK | \ |
| 2532 | PNG_FLAG_CRC_CRITICAL_MASK) |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 2533 | |
| 2534 | /* save typing and make code easier to understand */ |
| 2535 | #define PNG_COLOR_DIST(c1, c2) (abs((int)((c1).red) - (int)((c2).red)) + \ |
| 2536 | abs((int)((c1).green) - (int)((c2).green)) + \ |
| 2537 | abs((int)((c1).blue) - (int)((c2).blue))) |
| 2538 | |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 2539 | /* variables declared in png.c - only it needs to define PNG_NO_EXTERN */ |
Glenn Randers-Pehrson | 0f881d6 | 1998-02-07 10:20:57 -0600 | [diff] [blame] | 2540 | #if !defined(PNG_NO_EXTERN) || defined(PNG_ALWAYS_EXTERN) |
Glenn Randers-Pehrson | 46f61e2 | 1998-01-30 21:45:12 -0600 | [diff] [blame] | 2541 | /* place to hold the signature string for a PNG file. */ |
Glenn Randers-Pehrson | 074af5e | 1999-11-28 23:32:18 -0600 | [diff] [blame] | 2542 | #ifdef PNG_USE_GLOBAL_ARRAYS |
Glenn Randers-Pehrson | 5e5c1e1 | 2000-11-10 12:26:19 -0600 | [diff] [blame] | 2543 | PNG_EXPORT_VAR (const png_byte FARDATA) png_sig[8]; |
Glenn Randers-Pehrson | 5379b24 | 1999-11-27 10:22:33 -0600 | [diff] [blame] | 2544 | #else |
| 2545 | #define png_sig png_sig_bytes(NULL) |
| 2546 | #endif |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame] | 2547 | #endif /* PNG_NO_EXTERN */ |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 2548 | |
Glenn Randers-Pehrson | b6ce43d | 1998-01-01 07:13:13 -0600 | [diff] [blame] | 2549 | /* Constant strings for known chunk types. If you need to add a chunk, |
Glenn Randers-Pehrson | 074af5e | 1999-11-28 23:32:18 -0600 | [diff] [blame] | 2550 | * define the name here, and add an invocation of the macro in png.c and |
| 2551 | * wherever it's needed. |
Glenn Randers-Pehrson | b6ce43d | 1998-01-01 07:13:13 -0600 | [diff] [blame] | 2552 | */ |
Glenn Randers-Pehrson | 074af5e | 1999-11-28 23:32:18 -0600 | [diff] [blame] | 2553 | #define PNG_IHDR const png_byte png_IHDR[5] = { 73, 72, 68, 82, '\0'} |
| 2554 | #define PNG_IDAT const png_byte png_IDAT[5] = { 73, 68, 65, 84, '\0'} |
| 2555 | #define PNG_IEND const png_byte png_IEND[5] = { 73, 69, 78, 68, '\0'} |
| 2556 | #define PNG_PLTE const png_byte png_PLTE[5] = { 80, 76, 84, 69, '\0'} |
| 2557 | #define PNG_bKGD const png_byte png_bKGD[5] = { 98, 75, 71, 68, '\0'} |
| 2558 | #define PNG_cHRM const png_byte png_cHRM[5] = { 99, 72, 82, 77, '\0'} |
| 2559 | #define PNG_gAMA const png_byte png_gAMA[5] = {103, 65, 77, 65, '\0'} |
| 2560 | #define PNG_hIST const png_byte png_hIST[5] = {104, 73, 83, 84, '\0'} |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame] | 2561 | #define PNG_iCCP const png_byte png_iCCP[5] = {105, 67, 67, 80, '\0'} |
| 2562 | #define PNG_iTXt const png_byte png_iTXt[5] = {105, 84, 88, 116, '\0'} |
Glenn Randers-Pehrson | 074af5e | 1999-11-28 23:32:18 -0600 | [diff] [blame] | 2563 | #define PNG_oFFs const png_byte png_oFFs[5] = {111, 70, 70, 115, '\0'} |
| 2564 | #define PNG_pCAL const png_byte png_pCAL[5] = {112, 67, 65, 76, '\0'} |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame] | 2565 | #define PNG_sCAL const png_byte png_sCAL[5] = {115, 67, 65, 76, '\0'} |
Glenn Randers-Pehrson | 074af5e | 1999-11-28 23:32:18 -0600 | [diff] [blame] | 2566 | #define PNG_pHYs const png_byte png_pHYs[5] = {112, 72, 89, 115, '\0'} |
| 2567 | #define PNG_sBIT const png_byte png_sBIT[5] = {115, 66, 73, 84, '\0'} |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame] | 2568 | #define PNG_sPLT const png_byte png_sPLT[5] = {115, 80, 76, 84, '\0'} |
Glenn Randers-Pehrson | 074af5e | 1999-11-28 23:32:18 -0600 | [diff] [blame] | 2569 | #define PNG_sRGB const png_byte png_sRGB[5] = {115, 82, 71, 66, '\0'} |
| 2570 | #define PNG_tEXt const png_byte png_tEXt[5] = {116, 69, 88, 116, '\0'} |
| 2571 | #define PNG_tIME const png_byte png_tIME[5] = {116, 73, 77, 69, '\0'} |
| 2572 | #define PNG_tRNS const png_byte png_tRNS[5] = {116, 82, 78, 83, '\0'} |
| 2573 | #define PNG_zTXt const png_byte png_zTXt[5] = {122, 84, 88, 116, '\0'} |
| 2574 | |
| 2575 | #ifdef PNG_USE_GLOBAL_ARRAYS |
| 2576 | PNG_EXPORT_VAR (const png_byte FARDATA) png_IHDR[5]; |
| 2577 | PNG_EXPORT_VAR (const png_byte FARDATA) png_IDAT[5]; |
| 2578 | PNG_EXPORT_VAR (const png_byte FARDATA) png_IEND[5]; |
| 2579 | PNG_EXPORT_VAR (const png_byte FARDATA) png_PLTE[5]; |
| 2580 | PNG_EXPORT_VAR (const png_byte FARDATA) png_bKGD[5]; |
| 2581 | PNG_EXPORT_VAR (const png_byte FARDATA) png_cHRM[5]; |
| 2582 | PNG_EXPORT_VAR (const png_byte FARDATA) png_gAMA[5]; |
| 2583 | PNG_EXPORT_VAR (const png_byte FARDATA) png_hIST[5]; |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame] | 2584 | PNG_EXPORT_VAR (const png_byte FARDATA) png_iCCP[5]; |
| 2585 | PNG_EXPORT_VAR (const png_byte FARDATA) png_iTXt[5]; |
Glenn Randers-Pehrson | 074af5e | 1999-11-28 23:32:18 -0600 | [diff] [blame] | 2586 | PNG_EXPORT_VAR (const png_byte FARDATA) png_oFFs[5]; |
| 2587 | PNG_EXPORT_VAR (const png_byte FARDATA) png_pCAL[5]; |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame] | 2588 | PNG_EXPORT_VAR (const png_byte FARDATA) png_sCAL[5]; |
Glenn Randers-Pehrson | 074af5e | 1999-11-28 23:32:18 -0600 | [diff] [blame] | 2589 | PNG_EXPORT_VAR (const png_byte FARDATA) png_pHYs[5]; |
| 2590 | PNG_EXPORT_VAR (const png_byte FARDATA) png_sBIT[5]; |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame] | 2591 | PNG_EXPORT_VAR (const png_byte FARDATA) png_sPLT[5]; |
Glenn Randers-Pehrson | 074af5e | 1999-11-28 23:32:18 -0600 | [diff] [blame] | 2592 | PNG_EXPORT_VAR (const png_byte FARDATA) png_sRGB[5]; |
| 2593 | PNG_EXPORT_VAR (const png_byte FARDATA) png_tEXt[5]; |
| 2594 | PNG_EXPORT_VAR (const png_byte FARDATA) png_tIME[5]; |
| 2595 | PNG_EXPORT_VAR (const png_byte FARDATA) png_tRNS[5]; |
| 2596 | PNG_EXPORT_VAR (const png_byte FARDATA) png_zTXt[5]; |
| 2597 | #endif /* PNG_USE_GLOBAL_ARRAYS */ |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 2598 | |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 2599 | |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 2600 | /* Inline macros to do direct reads of bytes from the input buffer. These |
| 2601 | * require that you are using an architecture that uses PNG byte ordering |
| 2602 | * (MSB first) and supports unaligned data storage. I think that PowerPC |
| 2603 | * in big-endian mode and 680x0 are the only ones that will support this. |
| 2604 | * The x86 line of processors definitely do not. The png_get_int_32() |
| 2605 | * routine also assumes we are using two's complement format for negative |
| 2606 | * values, which is almost certainly true. |
| 2607 | */ |
| 2608 | #if defined(PNG_READ_BIG_ENDIAN_SUPPORTED) |
Glenn Randers-Pehrson | 1909560 | 2001-03-14 07:08:39 -0600 | [diff] [blame] | 2609 | # if defined(PNG_pCAL_SUPPORTED) || defined(PNG_oFFs_SUPPORTED) |
Glenn Randers-Pehrson | 61c32d9 | 2000-02-04 23:40:16 -0600 | [diff] [blame] | 2610 | # define png_get_int_32(buf) ( *((png_int_32p) (buf))) |
| 2611 | # endif |
| 2612 | # define png_get_uint_32(buf) ( *((png_uint_32p) (buf))) |
| 2613 | # define png_get_uint_16(buf) ( *((png_uint_16p) (buf))) |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 2614 | #else |
Glenn Randers-Pehrson | 1909560 | 2001-03-14 07:08:39 -0600 | [diff] [blame] | 2615 | # if defined(PNG_pCAL_SUPPORTED) || defined(PNG_oFFs_SUPPORTED) |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 2616 | PNG_EXTERN png_int_32 png_get_int_32 PNGARG((png_bytep buf)); |
Glenn Randers-Pehrson | 61c32d9 | 2000-02-04 23:40:16 -0600 | [diff] [blame] | 2617 | # endif |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 2618 | PNG_EXTERN png_uint_32 png_get_uint_32 PNGARG((png_bytep buf)); |
| 2619 | PNG_EXTERN png_uint_16 png_get_uint_16 PNGARG((png_bytep buf)); |
Glenn Randers-Pehrson | 61c32d9 | 2000-02-04 23:40:16 -0600 | [diff] [blame] | 2620 | #endif /* !PNG_READ_BIG_ENDIAN_SUPPORTED */ |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 2621 | |
Glenn Randers-Pehrson | b6ce43d | 1998-01-01 07:13:13 -0600 | [diff] [blame] | 2622 | /* Initialize png_ptr struct for reading, and allocate any other memory. |
Glenn Randers-Pehrson | 76e5fd6 | 2000-12-28 07:50:05 -0600 | [diff] [blame] | 2623 | * (old interface - DEPRECATED - use png_create_read_struct instead). |
Glenn Randers-Pehrson | b6ce43d | 1998-01-01 07:13:13 -0600 | [diff] [blame] | 2624 | */ |
Glenn Randers-Pehrson | 7529457 | 2000-05-06 14:09:57 -0500 | [diff] [blame] | 2625 | extern PNG_EXPORT(void,png_read_init) PNGARG((png_structp png_ptr)); |
Glenn Randers-Pehrson | b182893 | 2001-06-23 08:03:17 -0500 | [diff] [blame] | 2626 | #define png_read_init(png_ptr) png_read_init_3(&png_ptr, \ |
Glenn Randers-Pehrson | 8b6a889 | 2001-05-18 04:54:50 -0500 | [diff] [blame] | 2627 | PNG_LIBPNG_VER_STRING, sizeof(png_struct)); |
| 2628 | extern PNG_EXPORT(void,png_read_init_3) PNGARG((png_structpp ptr_ptr, |
| 2629 | png_const_charp user_png_ver, png_size_t png_struct_size)); |
Glenn Randers-Pehrson | 7529457 | 2000-05-06 14:09:57 -0500 | [diff] [blame] | 2630 | extern PNG_EXPORT(void,png_read_init_2) PNGARG((png_structp png_ptr, |
Glenn Randers-Pehrson | 98c9d73 | 2000-05-03 21:06:11 -0500 | [diff] [blame] | 2631 | png_const_charp user_png_ver, png_size_t png_struct_size, png_size_t |
| 2632 | png_info_size)); |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 2633 | |
Glenn Randers-Pehrson | b6ce43d | 1998-01-01 07:13:13 -0600 | [diff] [blame] | 2634 | /* Initialize png_ptr struct for writing, and allocate any other memory. |
Glenn Randers-Pehrson | 76e5fd6 | 2000-12-28 07:50:05 -0600 | [diff] [blame] | 2635 | * (old interface - DEPRECATED - use png_create_write_struct instead). |
Glenn Randers-Pehrson | b6ce43d | 1998-01-01 07:13:13 -0600 | [diff] [blame] | 2636 | */ |
Glenn Randers-Pehrson | 7529457 | 2000-05-06 14:09:57 -0500 | [diff] [blame] | 2637 | extern PNG_EXPORT(void,png_write_init) PNGARG((png_structp png_ptr)); |
Glenn Randers-Pehrson | b182893 | 2001-06-23 08:03:17 -0500 | [diff] [blame] | 2638 | #define png_write_init(png_ptr) png_write_init_3(&png_ptr, \ |
Glenn Randers-Pehrson | 8b6a889 | 2001-05-18 04:54:50 -0500 | [diff] [blame] | 2639 | PNG_LIBPNG_VER_STRING, sizeof(png_struct)); |
| 2640 | extern PNG_EXPORT(void,png_write_init_3) PNGARG((png_structpp ptr_ptr, |
| 2641 | png_const_charp user_png_ver, png_size_t png_struct_size)); |
Glenn Randers-Pehrson | 7529457 | 2000-05-06 14:09:57 -0500 | [diff] [blame] | 2642 | extern PNG_EXPORT(void,png_write_init_2) PNGARG((png_structp png_ptr, |
Glenn Randers-Pehrson | 98c9d73 | 2000-05-03 21:06:11 -0500 | [diff] [blame] | 2643 | png_const_charp user_png_ver, png_size_t png_struct_size, png_size_t |
| 2644 | png_info_size)); |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 2645 | |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame] | 2646 | /* Allocate memory for an internal libpng struct */ |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 2647 | PNG_EXTERN png_voidp png_create_struct PNGARG((int type)); |
Andreas Dilger | 02ad0ef | 1997-01-17 01:34:35 -0600 | [diff] [blame] | 2648 | |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame] | 2649 | /* Free memory from internal libpng struct */ |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 2650 | PNG_EXTERN void png_destroy_struct PNGARG((png_voidp struct_ptr)); |
Andreas Dilger | 02ad0ef | 1997-01-17 01:34:35 -0600 | [diff] [blame] | 2651 | |
Glenn Randers-Pehrson | f7d1a17 | 1998-06-06 15:31:35 -0500 | [diff] [blame] | 2652 | PNG_EXTERN png_voidp png_create_struct_2 PNGARG((int type, png_malloc_ptr |
Glenn Randers-Pehrson | 8b6a889 | 2001-05-18 04:54:50 -0500 | [diff] [blame] | 2653 | malloc_fn, png_voidp mem_ptr)); |
Glenn Randers-Pehrson | f7d1a17 | 1998-06-06 15:31:35 -0500 | [diff] [blame] | 2654 | PNG_EXTERN void png_destroy_struct_2 PNGARG((png_voidp struct_ptr, |
Glenn Randers-Pehrson | 8b6a889 | 2001-05-18 04:54:50 -0500 | [diff] [blame] | 2655 | png_free_ptr free_fn, png_voidp mem_ptr)); |
Glenn Randers-Pehrson | f7d1a17 | 1998-06-06 15:31:35 -0500 | [diff] [blame] | 2656 | |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame] | 2657 | /* Free any memory that info_ptr points to and reset struct. */ |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 2658 | PNG_EXTERN void png_info_destroy PNGARG((png_structp png_ptr, |
Andreas Dilger | 02ad0ef | 1997-01-17 01:34:35 -0600 | [diff] [blame] | 2659 | png_infop info_ptr)); |
| 2660 | |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame] | 2661 | /* Reset the CRC variable */ |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 2662 | PNG_EXTERN void png_reset_crc PNGARG((png_structp png_ptr)); |
| 2663 | |
| 2664 | /* Write the "data" buffer to whatever output you are using. */ |
| 2665 | PNG_EXTERN void png_write_data PNGARG((png_structp png_ptr, png_bytep data, |
| 2666 | png_size_t length)); |
| 2667 | |
| 2668 | /* Read data from whatever input you are using into the "data" buffer */ |
| 2669 | PNG_EXTERN void png_read_data PNGARG((png_structp png_ptr, png_bytep data, |
| 2670 | png_size_t length)); |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 2671 | |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame] | 2672 | /* Read bytes into buf, and update png_ptr->crc */ |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 2673 | PNG_EXTERN void png_crc_read PNGARG((png_structp png_ptr, png_bytep buf, |
| 2674 | png_size_t length)); |
Andreas Dilger | 02ad0ef | 1997-01-17 01:34:35 -0600 | [diff] [blame] | 2675 | |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame] | 2676 | /* Decompress data in a chunk that uses compression */ |
Glenn Randers-Pehrson | 1909560 | 2001-03-14 07:08:39 -0600 | [diff] [blame] | 2677 | #if defined(PNG_zTXt_SUPPORTED) || defined(PNG_iTXt_SUPPORTED) || \ |
| 2678 | defined(PNG_iCCP_SUPPORTED) || defined(PNG_sPLT_SUPPORTED) |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame] | 2679 | PNG_EXTERN png_charp png_decompress_chunk PNGARG((png_structp png_ptr, |
| 2680 | int comp_type, png_charp chunkdata, png_size_t chunklength, |
Glenn Randers-Pehrson | 68ea243 | 2000-04-01 21:10:05 -0600 | [diff] [blame] | 2681 | png_size_t prefix_length, png_size_t *data_length)); |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame] | 2682 | #endif |
| 2683 | |
| 2684 | /* Read "skip" bytes, read the file crc, and (optionally) verify png_ptr->crc */ |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 2685 | PNG_EXTERN int png_crc_finish PNGARG((png_structp png_ptr, png_uint_32 skip)); |
Andreas Dilger | 02ad0ef | 1997-01-17 01:34:35 -0600 | [diff] [blame] | 2686 | |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame] | 2687 | /* Read the CRC from the file and compare it to the libpng calculated CRC */ |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 2688 | PNG_EXTERN int png_crc_error PNGARG((png_structp png_ptr)); |
Andreas Dilger | 02ad0ef | 1997-01-17 01:34:35 -0600 | [diff] [blame] | 2689 | |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 2690 | /* Calculate the CRC over a section of data. Note that we are only |
| 2691 | * passing a maximum of 64K on systems that have this as a memory limit, |
| 2692 | * since this is the maximum buffer size we can specify. |
| 2693 | */ |
| 2694 | PNG_EXTERN void png_calculate_crc PNGARG((png_structp png_ptr, png_bytep ptr, |
| 2695 | png_size_t length)); |
Guy Schalnat | 6d76471 | 1995-12-19 03:22:19 -0600 | [diff] [blame] | 2696 | |
Guy Schalnat | 6d76471 | 1995-12-19 03:22:19 -0600 | [diff] [blame] | 2697 | #if defined(PNG_WRITE_FLUSH_SUPPORTED) |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 2698 | PNG_EXTERN void png_flush PNGARG((png_structp png_ptr)); |
Guy Schalnat | 6d76471 | 1995-12-19 03:22:19 -0600 | [diff] [blame] | 2699 | #endif |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 2700 | |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 2701 | /* Place a 32-bit number into a buffer in PNG byte order (big-endian). |
Glenn Randers-Pehrson | 5c6aeb2 | 1998-12-29 11:47:59 -0600 | [diff] [blame] | 2702 | * The only currently known PNG chunks that use signed numbers are |
| 2703 | * the ancillary extension chunks, oFFs and pCAL. |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 2704 | */ |
| 2705 | PNG_EXTERN void png_save_uint_32 PNGARG((png_bytep buf, png_uint_32 i)); |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 2706 | |
Glenn Randers-Pehrson | b182893 | 2001-06-23 08:03:17 -0500 | [diff] [blame] | 2707 | #if defined(PNG_WRITE_pCAL_SUPPORTED) || defined(PNG_WRITE_oFFs_SUPPORTED) |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 2708 | PNG_EXTERN void png_save_int_32 PNGARG((png_bytep buf, png_int_32 i)); |
| 2709 | #endif |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 2710 | |
Glenn Randers-Pehrson | 4393a9a | 1999-09-17 12:27:26 -0500 | [diff] [blame] | 2711 | /* Place a 16-bit number into a buffer in PNG byte order. |
Glenn Randers-Pehrson | b6ce43d | 1998-01-01 07:13:13 -0600 | [diff] [blame] | 2712 | * The parameter is declared unsigned int, not png_uint_16, |
| 2713 | * just to avoid potential problems on pre-ANSI C compilers. |
| 2714 | */ |
| 2715 | PNG_EXTERN void png_save_uint_16 PNGARG((png_bytep buf, unsigned int i)); |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 2716 | |
Glenn Randers-Pehrson | 46f61e2 | 1998-01-30 21:45:12 -0600 | [diff] [blame] | 2717 | /* simple function to write the signature */ |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 2718 | PNG_EXTERN void png_write_sig PNGARG((png_structp png_ptr)); |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 2719 | |
| 2720 | /* write various chunks */ |
| 2721 | |
| 2722 | /* Write the IHDR chunk, and update the png_struct with the necessary |
Glenn Randers-Pehrson | b6ce43d | 1998-01-01 07:13:13 -0600 | [diff] [blame] | 2723 | * information. |
| 2724 | */ |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 2725 | PNG_EXTERN void png_write_IHDR PNGARG((png_structp png_ptr, png_uint_32 width, |
Guy Schalnat | 4ee97b0 | 1996-01-16 01:51:56 -0600 | [diff] [blame] | 2726 | png_uint_32 height, |
Glenn Randers-Pehrson | 5e5c1e1 | 2000-11-10 12:26:19 -0600 | [diff] [blame] | 2727 | int bit_depth, int color_type, int compression_method, int filter_method, |
| 2728 | int interlace_method)); |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 2729 | |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 2730 | PNG_EXTERN void png_write_PLTE PNGARG((png_structp png_ptr, png_colorp palette, |
| 2731 | png_uint_32 num_pal)); |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 2732 | |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 2733 | PNG_EXTERN void png_write_IDAT PNGARG((png_structp png_ptr, png_bytep data, |
| 2734 | png_size_t length)); |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 2735 | |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 2736 | PNG_EXTERN void png_write_IEND PNGARG((png_structp png_ptr)); |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 2737 | |
Guy Schalnat | 51f0eb4 | 1995-09-26 05:22:39 -0500 | [diff] [blame] | 2738 | #if defined(PNG_WRITE_gAMA_SUPPORTED) |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame] | 2739 | #ifdef PNG_FLOATING_POINT_SUPPORTED |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 2740 | PNG_EXTERN void png_write_gAMA PNGARG((png_structp png_ptr, double file_gamma)); |
Guy Schalnat | 51f0eb4 | 1995-09-26 05:22:39 -0500 | [diff] [blame] | 2741 | #endif |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame] | 2742 | #ifdef PNG_FIXED_POINT_SUPPORTED |
Glenn Randers-Pehrson | 61c32d9 | 2000-02-04 23:40:16 -0600 | [diff] [blame] | 2743 | PNG_EXTERN void png_write_gAMA_fixed PNGARG((png_structp png_ptr, png_fixed_point |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame] | 2744 | file_gamma)); |
| 2745 | #endif |
| 2746 | #endif |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 2747 | |
Guy Schalnat | 51f0eb4 | 1995-09-26 05:22:39 -0500 | [diff] [blame] | 2748 | #if defined(PNG_WRITE_sBIT_SUPPORTED) |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 2749 | PNG_EXTERN void png_write_sBIT PNGARG((png_structp png_ptr, png_color_8p sbit, |
Guy Schalnat | 4ee97b0 | 1996-01-16 01:51:56 -0600 | [diff] [blame] | 2750 | int color_type)); |
Guy Schalnat | 51f0eb4 | 1995-09-26 05:22:39 -0500 | [diff] [blame] | 2751 | #endif |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 2752 | |
Guy Schalnat | 51f0eb4 | 1995-09-26 05:22:39 -0500 | [diff] [blame] | 2753 | #if defined(PNG_WRITE_cHRM_SUPPORTED) |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame] | 2754 | #ifdef PNG_FLOATING_POINT_SUPPORTED |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 2755 | PNG_EXTERN void png_write_cHRM PNGARG((png_structp png_ptr, |
Guy Schalnat | 4ee97b0 | 1996-01-16 01:51:56 -0600 | [diff] [blame] | 2756 | double white_x, double white_y, |
| 2757 | double red_x, double red_y, double green_x, double green_y, |
| 2758 | double blue_x, double blue_y)); |
Guy Schalnat | 51f0eb4 | 1995-09-26 05:22:39 -0500 | [diff] [blame] | 2759 | #endif |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame] | 2760 | #ifdef PNG_FIXED_POINT_SUPPORTED |
| 2761 | PNG_EXTERN void png_write_cHRM_fixed PNGARG((png_structp png_ptr, |
Glenn Randers-Pehrson | 61c32d9 | 2000-02-04 23:40:16 -0600 | [diff] [blame] | 2762 | png_fixed_point int_white_x, png_fixed_point int_white_y, |
| 2763 | png_fixed_point int_red_x, png_fixed_point int_red_y, png_fixed_point |
| 2764 | int_green_x, png_fixed_point int_green_y, png_fixed_point int_blue_x, |
| 2765 | png_fixed_point int_blue_y)); |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame] | 2766 | #endif |
| 2767 | #endif |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 2768 | |
Glenn Randers-Pehrson | b6ce43d | 1998-01-01 07:13:13 -0600 | [diff] [blame] | 2769 | #if defined(PNG_WRITE_sRGB_SUPPORTED) |
| 2770 | PNG_EXTERN void png_write_sRGB PNGARG((png_structp png_ptr, |
Glenn Randers-Pehrson | c4a2ae6 | 1998-01-16 22:06:18 -0600 | [diff] [blame] | 2771 | int intent)); |
Glenn Randers-Pehrson | b6ce43d | 1998-01-01 07:13:13 -0600 | [diff] [blame] | 2772 | #endif |
| 2773 | |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame] | 2774 | #if defined(PNG_WRITE_iCCP_SUPPORTED) |
| 2775 | PNG_EXTERN void png_write_iCCP PNGARG((png_structp png_ptr, |
| 2776 | png_charp name, int compression_type, |
| 2777 | png_charp profile, int proflen)); |
Glenn Randers-Pehrson | 2ad31ae | 2000-12-15 08:54:42 -0600 | [diff] [blame] | 2778 | /* Note to maintainer: profile should be png_bytep */ |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame] | 2779 | #endif |
| 2780 | |
| 2781 | #if defined(PNG_WRITE_sPLT_SUPPORTED) |
| 2782 | PNG_EXTERN void png_write_sPLT PNGARG((png_structp png_ptr, |
Glenn Randers-Pehrson | 520a764 | 2000-03-21 05:13:06 -0600 | [diff] [blame] | 2783 | png_sPLT_tp palette)); |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame] | 2784 | #endif |
| 2785 | |
Guy Schalnat | 51f0eb4 | 1995-09-26 05:22:39 -0500 | [diff] [blame] | 2786 | #if defined(PNG_WRITE_tRNS_SUPPORTED) |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 2787 | PNG_EXTERN void png_write_tRNS PNGARG((png_structp png_ptr, png_bytep trans, |
Guy Schalnat | 4ee97b0 | 1996-01-16 01:51:56 -0600 | [diff] [blame] | 2788 | png_color_16p values, int number, int color_type)); |
Guy Schalnat | 51f0eb4 | 1995-09-26 05:22:39 -0500 | [diff] [blame] | 2789 | #endif |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 2790 | |
Guy Schalnat | 51f0eb4 | 1995-09-26 05:22:39 -0500 | [diff] [blame] | 2791 | #if defined(PNG_WRITE_bKGD_SUPPORTED) |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 2792 | PNG_EXTERN void png_write_bKGD PNGARG((png_structp png_ptr, |
| 2793 | png_color_16p values, int color_type)); |
Guy Schalnat | 51f0eb4 | 1995-09-26 05:22:39 -0500 | [diff] [blame] | 2794 | #endif |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 2795 | |
Guy Schalnat | 51f0eb4 | 1995-09-26 05:22:39 -0500 | [diff] [blame] | 2796 | #if defined(PNG_WRITE_hIST_SUPPORTED) |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 2797 | PNG_EXTERN void png_write_hIST PNGARG((png_structp png_ptr, png_uint_16p hist, |
Glenn Randers-Pehrson | 0f881d6 | 1998-02-07 10:20:57 -0600 | [diff] [blame] | 2798 | int num_hist)); |
Guy Schalnat | 51f0eb4 | 1995-09-26 05:22:39 -0500 | [diff] [blame] | 2799 | #endif |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 2800 | |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame] | 2801 | #if defined(PNG_WRITE_TEXT_SUPPORTED) || defined(PNG_WRITE_pCAL_SUPPORTED) || \ |
| 2802 | defined(PNG_WRITE_iCCP_SUPPORTED) || defined(PNG_WRITE_sPLT_SUPPORTED) |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 2803 | PNG_EXTERN png_size_t png_check_keyword PNGARG((png_structp png_ptr, |
Glenn Randers-Pehrson | b6ce43d | 1998-01-01 07:13:13 -0600 | [diff] [blame] | 2804 | png_charp key, png_charpp new_key)); |
Andreas Dilger | 02ad0ef | 1997-01-17 01:34:35 -0600 | [diff] [blame] | 2805 | #endif |
| 2806 | |
Guy Schalnat | 51f0eb4 | 1995-09-26 05:22:39 -0500 | [diff] [blame] | 2807 | #if defined(PNG_WRITE_tEXt_SUPPORTED) |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 2808 | PNG_EXTERN void png_write_tEXt PNGARG((png_structp png_ptr, png_charp key, |
| 2809 | png_charp text, png_size_t text_len)); |
Guy Schalnat | 51f0eb4 | 1995-09-26 05:22:39 -0500 | [diff] [blame] | 2810 | #endif |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 2811 | |
Guy Schalnat | 51f0eb4 | 1995-09-26 05:22:39 -0500 | [diff] [blame] | 2812 | #if defined(PNG_WRITE_zTXt_SUPPORTED) |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 2813 | PNG_EXTERN void png_write_zTXt PNGARG((png_structp png_ptr, png_charp key, |
| 2814 | png_charp text, png_size_t text_len, int compression)); |
Guy Schalnat | 51f0eb4 | 1995-09-26 05:22:39 -0500 | [diff] [blame] | 2815 | #endif |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 2816 | |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame] | 2817 | #if defined(PNG_WRITE_iTXt_SUPPORTED) |
| 2818 | PNG_EXTERN void png_write_iTXt PNGARG((png_structp png_ptr, |
Glenn Randers-Pehrson | 61c32d9 | 2000-02-04 23:40:16 -0600 | [diff] [blame] | 2819 | int compression, png_charp key, png_charp lang, png_charp lang_key, |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame] | 2820 | png_charp text)); |
| 2821 | #endif |
| 2822 | |
Guy Schalnat | 51f0eb4 | 1995-09-26 05:22:39 -0500 | [diff] [blame] | 2823 | #if defined(PNG_WRITE_oFFs_SUPPORTED) |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 2824 | PNG_EXTERN void png_write_oFFs PNGARG((png_structp png_ptr, |
Glenn Randers-Pehrson | b182893 | 2001-06-23 08:03:17 -0500 | [diff] [blame] | 2825 | png_int_32 x_offset, png_int_32 y_offset, int unit_type)); |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 2826 | #endif |
| 2827 | |
| 2828 | #if defined(PNG_WRITE_pCAL_SUPPORTED) |
| 2829 | PNG_EXTERN void png_write_pCAL PNGARG((png_structp png_ptr, png_charp purpose, |
| 2830 | png_int_32 X0, png_int_32 X1, int type, int nparams, |
| 2831 | png_charp units, png_charpp params)); |
| 2832 | #endif |
| 2833 | |
| 2834 | #if defined(PNG_WRITE_pHYs_SUPPORTED) |
| 2835 | PNG_EXTERN void png_write_pHYs PNGARG((png_structp png_ptr, |
| 2836 | png_uint_32 x_pixels_per_unit, png_uint_32 y_pixels_per_unit, |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 2837 | int unit_type)); |
Guy Schalnat | 51f0eb4 | 1995-09-26 05:22:39 -0500 | [diff] [blame] | 2838 | #endif |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 2839 | |
Guy Schalnat | 51f0eb4 | 1995-09-26 05:22:39 -0500 | [diff] [blame] | 2840 | #if defined(PNG_WRITE_tIME_SUPPORTED) |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 2841 | PNG_EXTERN void png_write_tIME PNGARG((png_structp png_ptr, |
Guy Schalnat | 4ee97b0 | 1996-01-16 01:51:56 -0600 | [diff] [blame] | 2842 | png_timep mod_time)); |
Guy Schalnat | 51f0eb4 | 1995-09-26 05:22:39 -0500 | [diff] [blame] | 2843 | #endif |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 2844 | |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame] | 2845 | #if defined(PNG_WRITE_sCAL_SUPPORTED) |
Glenn Randers-Pehrson | 68ea243 | 2000-04-01 21:10:05 -0600 | [diff] [blame] | 2846 | #if defined(PNG_FLOATING_POINT_SUPPORTED) && !defined(PNG_NO_STDIO) |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame] | 2847 | PNG_EXTERN void png_write_sCAL PNGARG((png_structp png_ptr, |
Glenn Randers-Pehrson | 61c32d9 | 2000-02-04 23:40:16 -0600 | [diff] [blame] | 2848 | int unit, double width, double height)); |
| 2849 | #else |
| 2850 | #ifdef PNG_FIXED_POINT_SUPPORTED |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame] | 2851 | PNG_EXTERN void png_write_sCAL_s PNGARG((png_structp png_ptr, |
Glenn Randers-Pehrson | 61c32d9 | 2000-02-04 23:40:16 -0600 | [diff] [blame] | 2852 | int unit, png_charp width, png_charp height)); |
| 2853 | #endif |
| 2854 | #endif |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame] | 2855 | #endif |
| 2856 | |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 2857 | /* Called when finished processing a row of data */ |
| 2858 | PNG_EXTERN void png_write_finish_row PNGARG((png_structp png_ptr)); |
Guy Schalnat | 51f0eb4 | 1995-09-26 05:22:39 -0500 | [diff] [blame] | 2859 | |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 2860 | /* Internal use only. Called before first row of data */ |
| 2861 | PNG_EXTERN void png_write_start_row PNGARG((png_structp png_ptr)); |
Guy Schalnat | 51f0eb4 | 1995-09-26 05:22:39 -0500 | [diff] [blame] | 2862 | |
| 2863 | #if defined(PNG_READ_GAMMA_SUPPORTED) |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 2864 | PNG_EXTERN void png_build_gamma_table PNGARG((png_structp png_ptr)); |
Guy Schalnat | 51f0eb4 | 1995-09-26 05:22:39 -0500 | [diff] [blame] | 2865 | #endif |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 2866 | |
| 2867 | /* combine a row of data, dealing with alpha, etc. if requested */ |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 2868 | PNG_EXTERN void png_combine_row PNGARG((png_structp png_ptr, png_bytep row, |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 2869 | int mask)); |
Guy Schalnat | 51f0eb4 | 1995-09-26 05:22:39 -0500 | [diff] [blame] | 2870 | |
| 2871 | #if defined(PNG_READ_INTERLACING_SUPPORTED) |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 2872 | /* expand an interlaced row */ |
Glenn Randers-Pehrson | 1909560 | 2001-03-14 07:08:39 -0600 | [diff] [blame] | 2873 | /* OLD pre-1.0.9 interface: |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 2874 | PNG_EXTERN void png_do_read_interlace PNGARG((png_row_infop row_info, |
| 2875 | png_bytep row, int pass, png_uint_32 transformations)); |
Glenn Randers-Pehrson | 231e687 | 2001-01-12 15:13:06 -0600 | [diff] [blame] | 2876 | */ |
| 2877 | PNG_EXTERN void png_do_read_interlace PNGARG((png_structp png_ptr)); |
Guy Schalnat | 51f0eb4 | 1995-09-26 05:22:39 -0500 | [diff] [blame] | 2878 | #endif |
| 2879 | |
Glenn Randers-Pehrson | 231e687 | 2001-01-12 15:13:06 -0600 | [diff] [blame] | 2880 | /* GRR TO DO (2.0 or whenever): simplify other internal calling interfaces */ |
| 2881 | |
Guy Schalnat | 51f0eb4 | 1995-09-26 05:22:39 -0500 | [diff] [blame] | 2882 | #if defined(PNG_WRITE_INTERLACING_SUPPORTED) |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 2883 | /* grab pixels out of a row for an interlaced pass */ |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 2884 | PNG_EXTERN void png_do_write_interlace PNGARG((png_row_infop row_info, |
Guy Schalnat | 4ee97b0 | 1996-01-16 01:51:56 -0600 | [diff] [blame] | 2885 | png_bytep row, int pass)); |
Guy Schalnat | 51f0eb4 | 1995-09-26 05:22:39 -0500 | [diff] [blame] | 2886 | #endif |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 2887 | |
| 2888 | /* unfilter a row */ |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 2889 | PNG_EXTERN void png_read_filter_row PNGARG((png_structp png_ptr, |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 2890 | png_row_infop row_info, png_bytep row, png_bytep prev_row, int filter)); |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 2891 | |
| 2892 | /* Choose the best filter to use and filter the row data */ |
| 2893 | PNG_EXTERN void png_write_find_filter PNGARG((png_structp png_ptr, |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 2894 | png_row_infop row_info)); |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 2895 | |
| 2896 | /* Write out the filtered row. */ |
| 2897 | PNG_EXTERN void png_write_filtered_row PNGARG((png_structp png_ptr, |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 2898 | png_bytep filtered_row)); |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 2899 | /* finish a row while reading, dealing with interlacing passes, etc. */ |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 2900 | PNG_EXTERN void png_read_finish_row PNGARG((png_structp png_ptr)); |
| 2901 | |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 2902 | /* initialize the row buffers, etc. */ |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 2903 | PNG_EXTERN void png_read_start_row PNGARG((png_structp png_ptr)); |
Guy Schalnat | 51f0eb4 | 1995-09-26 05:22:39 -0500 | [diff] [blame] | 2904 | /* optional call to update the users info structure */ |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 2905 | PNG_EXTERN void png_read_transform_info PNGARG((png_structp png_ptr, |
Guy Schalnat | 4ee97b0 | 1996-01-16 01:51:56 -0600 | [diff] [blame] | 2906 | png_infop info_ptr)); |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 2907 | |
| 2908 | /* these are the functions that do the transformations */ |
Guy Schalnat | 51f0eb4 | 1995-09-26 05:22:39 -0500 | [diff] [blame] | 2909 | #if defined(PNG_READ_FILLER_SUPPORTED) |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 2910 | PNG_EXTERN void png_do_read_filler PNGARG((png_row_infop row_info, |
| 2911 | png_bytep row, png_uint_32 filler, png_uint_32 flags)); |
Guy Schalnat | 51f0eb4 | 1995-09-26 05:22:39 -0500 | [diff] [blame] | 2912 | #endif |
| 2913 | |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 2914 | #if defined(PNG_READ_SWAP_ALPHA_SUPPORTED) |
| 2915 | PNG_EXTERN void png_do_read_swap_alpha PNGARG((png_row_infop row_info, |
| 2916 | png_bytep row)); |
| 2917 | #endif |
| 2918 | |
| 2919 | #if defined(PNG_WRITE_SWAP_ALPHA_SUPPORTED) |
| 2920 | PNG_EXTERN void png_do_write_swap_alpha PNGARG((png_row_infop row_info, |
| 2921 | png_bytep row)); |
| 2922 | #endif |
| 2923 | |
Glenn Randers-Pehrson | c4a2ae6 | 1998-01-16 22:06:18 -0600 | [diff] [blame] | 2924 | #if defined(PNG_READ_INVERT_ALPHA_SUPPORTED) |
| 2925 | PNG_EXTERN void png_do_read_invert_alpha PNGARG((png_row_infop row_info, |
| 2926 | png_bytep row)); |
| 2927 | #endif |
| 2928 | |
| 2929 | #if defined(PNG_WRITE_INVERT_ALPHA_SUPPORTED) |
| 2930 | PNG_EXTERN void png_do_write_invert_alpha PNGARG((png_row_infop row_info, |
| 2931 | png_bytep row)); |
| 2932 | #endif |
| 2933 | |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 2934 | #if defined(PNG_WRITE_FILLER_SUPPORTED) || \ |
| 2935 | defined(PNG_READ_STRIP_ALPHA_SUPPORTED) |
| 2936 | PNG_EXTERN void png_do_strip_filler PNGARG((png_row_infop row_info, |
| 2937 | png_bytep row, png_uint_32 flags)); |
Guy Schalnat | 51f0eb4 | 1995-09-26 05:22:39 -0500 | [diff] [blame] | 2938 | #endif |
| 2939 | |
| 2940 | #if defined(PNG_READ_SWAP_SUPPORTED) || defined(PNG_WRITE_SWAP_SUPPORTED) |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 2941 | PNG_EXTERN void png_do_swap PNGARG((png_row_infop row_info, png_bytep row)); |
| 2942 | #endif |
| 2943 | |
Glenn Randers-Pehrson | 8f8fb6a | 1998-03-09 23:02:06 -0600 | [diff] [blame] | 2944 | #if defined(PNG_READ_PACKSWAP_SUPPORTED) || defined(PNG_WRITE_PACKSWAP_SUPPORTED) |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 2945 | PNG_EXTERN void png_do_packswap PNGARG((png_row_infop row_info, png_bytep row)); |
Guy Schalnat | 51f0eb4 | 1995-09-26 05:22:39 -0500 | [diff] [blame] | 2946 | #endif |
| 2947 | |
Andreas Dilger | 02ad0ef | 1997-01-17 01:34:35 -0600 | [diff] [blame] | 2948 | #if defined(PNG_READ_RGB_TO_GRAY_SUPPORTED) |
Glenn Randers-Pehrson | 5c6aeb2 | 1998-12-29 11:47:59 -0600 | [diff] [blame] | 2949 | PNG_EXTERN int png_do_rgb_to_gray PNGARG((png_structp png_ptr, png_row_infop |
| 2950 | row_info, png_bytep row)); |
Andreas Dilger | 02ad0ef | 1997-01-17 01:34:35 -0600 | [diff] [blame] | 2951 | #endif |
| 2952 | |
| 2953 | #if defined(PNG_READ_GRAY_TO_RGB_SUPPORTED) |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 2954 | PNG_EXTERN void png_do_gray_to_rgb PNGARG((png_row_infop row_info, |
| 2955 | png_bytep row)); |
Andreas Dilger | 02ad0ef | 1997-01-17 01:34:35 -0600 | [diff] [blame] | 2956 | #endif |
| 2957 | |
Guy Schalnat | 51f0eb4 | 1995-09-26 05:22:39 -0500 | [diff] [blame] | 2958 | #if defined(PNG_READ_PACK_SUPPORTED) |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 2959 | PNG_EXTERN void png_do_unpack PNGARG((png_row_infop row_info, png_bytep row)); |
Guy Schalnat | 51f0eb4 | 1995-09-26 05:22:39 -0500 | [diff] [blame] | 2960 | #endif |
| 2961 | |
| 2962 | #if defined(PNG_READ_SHIFT_SUPPORTED) |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 2963 | PNG_EXTERN void png_do_unshift PNGARG((png_row_infop row_info, png_bytep row, |
Guy Schalnat | 6d76471 | 1995-12-19 03:22:19 -0600 | [diff] [blame] | 2964 | png_color_8p sig_bits)); |
Guy Schalnat | 51f0eb4 | 1995-09-26 05:22:39 -0500 | [diff] [blame] | 2965 | #endif |
| 2966 | |
| 2967 | #if defined(PNG_READ_INVERT_SUPPORTED) || defined(PNG_WRITE_INVERT_SUPPORTED) |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 2968 | PNG_EXTERN void png_do_invert PNGARG((png_row_infop row_info, png_bytep row)); |
Guy Schalnat | 51f0eb4 | 1995-09-26 05:22:39 -0500 | [diff] [blame] | 2969 | #endif |
| 2970 | |
Guy Schalnat | 51f0eb4 | 1995-09-26 05:22:39 -0500 | [diff] [blame] | 2971 | #if defined(PNG_READ_16_TO_8_SUPPORTED) |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 2972 | PNG_EXTERN void png_do_chop PNGARG((png_row_infop row_info, png_bytep row)); |
Guy Schalnat | 51f0eb4 | 1995-09-26 05:22:39 -0500 | [diff] [blame] | 2973 | #endif |
| 2974 | |
| 2975 | #if defined(PNG_READ_DITHER_SUPPORTED) |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 2976 | PNG_EXTERN void png_do_dither PNGARG((png_row_infop row_info, |
Guy Schalnat | 4ee97b0 | 1996-01-16 01:51:56 -0600 | [diff] [blame] | 2977 | png_bytep row, png_bytep palette_lookup, png_bytep dither_lookup)); |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 2978 | |
Andreas Dilger | 02ad0ef | 1997-01-17 01:34:35 -0600 | [diff] [blame] | 2979 | # if defined(PNG_CORRECT_PALETTE_SUPPORTED) |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 2980 | PNG_EXTERN void png_correct_palette PNGARG((png_structp png_ptr, |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 2981 | png_colorp palette, int num_palette)); |
Andreas Dilger | 02ad0ef | 1997-01-17 01:34:35 -0600 | [diff] [blame] | 2982 | # endif |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 2983 | #endif |
| 2984 | |
Guy Schalnat | 51f0eb4 | 1995-09-26 05:22:39 -0500 | [diff] [blame] | 2985 | #if defined(PNG_READ_BGR_SUPPORTED) || defined(PNG_WRITE_BGR_SUPPORTED) |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 2986 | PNG_EXTERN void png_do_bgr PNGARG((png_row_infop row_info, png_bytep row)); |
Guy Schalnat | 51f0eb4 | 1995-09-26 05:22:39 -0500 | [diff] [blame] | 2987 | #endif |
| 2988 | |
| 2989 | #if defined(PNG_WRITE_PACK_SUPPORTED) |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 2990 | PNG_EXTERN void png_do_pack PNGARG((png_row_infop row_info, |
| 2991 | png_bytep row, png_uint_32 bit_depth)); |
Guy Schalnat | 51f0eb4 | 1995-09-26 05:22:39 -0500 | [diff] [blame] | 2992 | #endif |
| 2993 | |
| 2994 | #if defined(PNG_WRITE_SHIFT_SUPPORTED) |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 2995 | PNG_EXTERN void png_do_shift PNGARG((png_row_infop row_info, png_bytep row, |
Guy Schalnat | 6d76471 | 1995-12-19 03:22:19 -0600 | [diff] [blame] | 2996 | png_color_8p bit_depth)); |
Guy Schalnat | 51f0eb4 | 1995-09-26 05:22:39 -0500 | [diff] [blame] | 2997 | #endif |
| 2998 | |
| 2999 | #if defined(PNG_READ_BACKGROUND_SUPPORTED) |
Glenn Randers-Pehrson | 5a0be34 | 2001-10-18 20:55:13 -0500 | [diff] [blame] | 3000 | #if defined(PNG_READ_GAMMA_SUPPORTED) |
Glenn Randers-Pehrson | 3f54925 | 2001-10-27 07:35:13 -0500 | [diff] [blame] | 3001 | PNG_EXTERN void png_do_background PNGARG((png_row_infop row_info, png_bytep row, |
| 3002 | png_color_16p trans_values, png_color_16p background, |
| 3003 | png_color_16p background_1, |
Guy Schalnat | 4ee97b0 | 1996-01-16 01:51:56 -0600 | [diff] [blame] | 3004 | png_bytep gamma_table, png_bytep gamma_from_1, png_bytep gamma_to_1, |
| 3005 | png_uint_16pp gamma_16, png_uint_16pp gamma_16_from_1, |
Glenn Randers-Pehrson | 3f54925 | 2001-10-27 07:35:13 -0500 | [diff] [blame] | 3006 | png_uint_16pp gamma_16_to_1, int gamma_shift)); |
| 3007 | #else |
| 3008 | PNG_EXTERN void png_do_background PNGARG((png_row_infop row_info, png_bytep row, |
| 3009 | png_color_16p trans_values, png_color_16p background)); |
Glenn Randers-Pehrson | 5a0be34 | 2001-10-18 20:55:13 -0500 | [diff] [blame] | 3010 | #endif |
Guy Schalnat | 51f0eb4 | 1995-09-26 05:22:39 -0500 | [diff] [blame] | 3011 | #endif |
| 3012 | |
| 3013 | #if defined(PNG_READ_GAMMA_SUPPORTED) |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 3014 | PNG_EXTERN void png_do_gamma PNGARG((png_row_infop row_info, png_bytep row, |
Guy Schalnat | 4ee97b0 | 1996-01-16 01:51:56 -0600 | [diff] [blame] | 3015 | png_bytep gamma_table, png_uint_16pp gamma_16_table, |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 3016 | int gamma_shift)); |
Guy Schalnat | 51f0eb4 | 1995-09-26 05:22:39 -0500 | [diff] [blame] | 3017 | #endif |
| 3018 | |
| 3019 | #if defined(PNG_READ_EXPAND_SUPPORTED) |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 3020 | PNG_EXTERN void png_do_expand_palette PNGARG((png_row_infop row_info, |
Guy Schalnat | 4ee97b0 | 1996-01-16 01:51:56 -0600 | [diff] [blame] | 3021 | png_bytep row, png_colorp palette, png_bytep trans, int num_trans)); |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 3022 | PNG_EXTERN void png_do_expand PNGARG((png_row_infop row_info, |
Guy Schalnat | 4ee97b0 | 1996-01-16 01:51:56 -0600 | [diff] [blame] | 3023 | png_bytep row, png_color_16p trans_value)); |
Guy Schalnat | 51f0eb4 | 1995-09-26 05:22:39 -0500 | [diff] [blame] | 3024 | #endif |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 3025 | |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 3026 | /* The following decodes the appropriate chunks, and does error correction, |
Glenn Randers-Pehrson | b6ce43d | 1998-01-01 07:13:13 -0600 | [diff] [blame] | 3027 | * then calls the appropriate callback for the chunk if it is valid. |
| 3028 | */ |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 3029 | |
| 3030 | /* decode the IHDR chunk */ |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 3031 | PNG_EXTERN void png_handle_IHDR PNGARG((png_structp png_ptr, png_infop info_ptr, |
Guy Schalnat | 4ee97b0 | 1996-01-16 01:51:56 -0600 | [diff] [blame] | 3032 | png_uint_32 length)); |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 3033 | PNG_EXTERN void png_handle_PLTE PNGARG((png_structp png_ptr, png_infop info_ptr, |
Andreas Dilger | 02ad0ef | 1997-01-17 01:34:35 -0600 | [diff] [blame] | 3034 | png_uint_32 length)); |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 3035 | PNG_EXTERN void png_handle_IEND PNGARG((png_structp png_ptr, png_infop info_ptr, |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 3036 | png_uint_32 length)); |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 3037 | |
Glenn Randers-Pehrson | 61c32d9 | 2000-02-04 23:40:16 -0600 | [diff] [blame] | 3038 | #if defined(PNG_READ_bKGD_SUPPORTED) |
| 3039 | PNG_EXTERN void png_handle_bKGD PNGARG((png_structp png_ptr, png_infop info_ptr, |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 3040 | png_uint_32 length)); |
Guy Schalnat | 51f0eb4 | 1995-09-26 05:22:39 -0500 | [diff] [blame] | 3041 | #endif |
| 3042 | |
| 3043 | #if defined(PNG_READ_cHRM_SUPPORTED) |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 3044 | PNG_EXTERN void png_handle_cHRM PNGARG((png_structp png_ptr, png_infop info_ptr, |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 3045 | png_uint_32 length)); |
Guy Schalnat | 51f0eb4 | 1995-09-26 05:22:39 -0500 | [diff] [blame] | 3046 | #endif |
| 3047 | |
Glenn Randers-Pehrson | 61c32d9 | 2000-02-04 23:40:16 -0600 | [diff] [blame] | 3048 | #if defined(PNG_READ_gAMA_SUPPORTED) |
| 3049 | PNG_EXTERN void png_handle_gAMA PNGARG((png_structp png_ptr, png_infop info_ptr, |
| 3050 | png_uint_32 length)); |
| 3051 | #endif |
| 3052 | |
| 3053 | #if defined(PNG_READ_hIST_SUPPORTED) |
| 3054 | PNG_EXTERN void png_handle_hIST PNGARG((png_structp png_ptr, png_infop info_ptr, |
Glenn Randers-Pehrson | b6ce43d | 1998-01-01 07:13:13 -0600 | [diff] [blame] | 3055 | png_uint_32 length)); |
| 3056 | #endif |
| 3057 | |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame] | 3058 | #if defined(PNG_READ_iCCP_SUPPORTED) |
| 3059 | extern void png_handle_iCCP PNGARG((png_structp png_ptr, png_infop info_ptr, |
| 3060 | png_uint_32 length)); |
| 3061 | #endif /* PNG_READ_iCCP_SUPPORTED */ |
| 3062 | |
Glenn Randers-Pehrson | 61c32d9 | 2000-02-04 23:40:16 -0600 | [diff] [blame] | 3063 | #if defined(PNG_READ_iTXt_SUPPORTED) |
| 3064 | PNG_EXTERN void png_handle_iTXt PNGARG((png_structp png_ptr, png_infop info_ptr, |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 3065 | png_uint_32 length)); |
Guy Schalnat | 51f0eb4 | 1995-09-26 05:22:39 -0500 | [diff] [blame] | 3066 | #endif |
| 3067 | |
| 3068 | #if defined(PNG_READ_oFFs_SUPPORTED) |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 3069 | PNG_EXTERN void png_handle_oFFs PNGARG((png_structp png_ptr, png_infop info_ptr, |
| 3070 | png_uint_32 length)); |
| 3071 | #endif |
| 3072 | |
| 3073 | #if defined(PNG_READ_pCAL_SUPPORTED) |
| 3074 | PNG_EXTERN void png_handle_pCAL PNGARG((png_structp png_ptr, png_infop info_ptr, |
| 3075 | png_uint_32 length)); |
| 3076 | #endif |
| 3077 | |
| 3078 | #if defined(PNG_READ_pHYs_SUPPORTED) |
| 3079 | PNG_EXTERN void png_handle_pHYs PNGARG((png_structp png_ptr, png_infop info_ptr, |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 3080 | png_uint_32 length)); |
Guy Schalnat | 51f0eb4 | 1995-09-26 05:22:39 -0500 | [diff] [blame] | 3081 | #endif |
| 3082 | |
Glenn Randers-Pehrson | 61c32d9 | 2000-02-04 23:40:16 -0600 | [diff] [blame] | 3083 | #if defined(PNG_READ_sBIT_SUPPORTED) |
| 3084 | PNG_EXTERN void png_handle_sBIT PNGARG((png_structp png_ptr, png_infop info_ptr, |
| 3085 | png_uint_32 length)); |
| 3086 | #endif |
| 3087 | |
| 3088 | #if defined(PNG_READ_sCAL_SUPPORTED) |
| 3089 | PNG_EXTERN void png_handle_sCAL PNGARG((png_structp png_ptr, png_infop info_ptr, |
| 3090 | png_uint_32 length)); |
| 3091 | #endif |
| 3092 | |
| 3093 | #if defined(PNG_READ_sPLT_SUPPORTED) |
| 3094 | extern void png_handle_sPLT PNGARG((png_structp png_ptr, png_infop info_ptr, |
| 3095 | png_uint_32 length)); |
| 3096 | #endif /* PNG_READ_sPLT_SUPPORTED */ |
| 3097 | |
| 3098 | #if defined(PNG_READ_sRGB_SUPPORTED) |
| 3099 | PNG_EXTERN void png_handle_sRGB PNGARG((png_structp png_ptr, png_infop info_ptr, |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 3100 | png_uint_32 length)); |
Guy Schalnat | 51f0eb4 | 1995-09-26 05:22:39 -0500 | [diff] [blame] | 3101 | #endif |
| 3102 | |
| 3103 | #if defined(PNG_READ_tEXt_SUPPORTED) |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 3104 | PNG_EXTERN void png_handle_tEXt PNGARG((png_structp png_ptr, png_infop info_ptr, |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 3105 | png_uint_32 length)); |
Guy Schalnat | 51f0eb4 | 1995-09-26 05:22:39 -0500 | [diff] [blame] | 3106 | #endif |
| 3107 | |
Glenn Randers-Pehrson | 61c32d9 | 2000-02-04 23:40:16 -0600 | [diff] [blame] | 3108 | #if defined(PNG_READ_tIME_SUPPORTED) |
| 3109 | PNG_EXTERN void png_handle_tIME PNGARG((png_structp png_ptr, png_infop info_ptr, |
| 3110 | png_uint_32 length)); |
| 3111 | #endif |
| 3112 | |
| 3113 | #if defined(PNG_READ_tRNS_SUPPORTED) |
| 3114 | PNG_EXTERN void png_handle_tRNS PNGARG((png_structp png_ptr, png_infop info_ptr, |
| 3115 | png_uint_32 length)); |
| 3116 | #endif |
| 3117 | |
Guy Schalnat | 51f0eb4 | 1995-09-26 05:22:39 -0500 | [diff] [blame] | 3118 | #if defined(PNG_READ_zTXt_SUPPORTED) |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 3119 | PNG_EXTERN void png_handle_zTXt PNGARG((png_structp png_ptr, png_infop info_ptr, |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 3120 | png_uint_32 length)); |
Guy Schalnat | 51f0eb4 | 1995-09-26 05:22:39 -0500 | [diff] [blame] | 3121 | #endif |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 3122 | |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 3123 | PNG_EXTERN void png_handle_unknown PNGARG((png_structp png_ptr, |
| 3124 | png_infop info_ptr, png_uint_32 length)); |
Andreas Dilger | 02ad0ef | 1997-01-17 01:34:35 -0600 | [diff] [blame] | 3125 | |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 3126 | PNG_EXTERN void png_check_chunk_name PNGARG((png_structp png_ptr, |
Andreas Dilger | 02ad0ef | 1997-01-17 01:34:35 -0600 | [diff] [blame] | 3127 | png_bytep chunk_name)); |
| 3128 | |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 3129 | /* handle the transformations for reading and writing */ |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 3130 | PNG_EXTERN void png_do_read_transformations PNGARG((png_structp png_ptr)); |
| 3131 | PNG_EXTERN void png_do_write_transformations PNGARG((png_structp png_ptr)); |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 3132 | |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 3133 | PNG_EXTERN void png_init_read_transformations PNGARG((png_structp png_ptr)); |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 3134 | |
Guy Schalnat | 6d76471 | 1995-12-19 03:22:19 -0600 | [diff] [blame] | 3135 | #ifdef PNG_PROGRESSIVE_READ_SUPPORTED |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 3136 | PNG_EXTERN void png_push_read_chunk PNGARG((png_structp png_ptr, |
Andreas Dilger | 02ad0ef | 1997-01-17 01:34:35 -0600 | [diff] [blame] | 3137 | png_infop info_ptr)); |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 3138 | PNG_EXTERN void png_push_read_sig PNGARG((png_structp png_ptr, |
| 3139 | png_infop info_ptr)); |
| 3140 | PNG_EXTERN void png_push_check_crc PNGARG((png_structp png_ptr)); |
| 3141 | PNG_EXTERN void png_push_crc_skip PNGARG((png_structp png_ptr, |
Guy Schalnat | 4ee97b0 | 1996-01-16 01:51:56 -0600 | [diff] [blame] | 3142 | png_uint_32 length)); |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 3143 | PNG_EXTERN void png_push_crc_finish PNGARG((png_structp png_ptr)); |
| 3144 | PNG_EXTERN void png_push_fill_buffer PNGARG((png_structp png_ptr, |
| 3145 | png_bytep buffer, png_size_t length)); |
| 3146 | PNG_EXTERN void png_push_save_buffer PNGARG((png_structp png_ptr)); |
| 3147 | PNG_EXTERN void png_push_restore_buffer PNGARG((png_structp png_ptr, |
| 3148 | png_bytep buffer, png_size_t buffer_length)); |
| 3149 | PNG_EXTERN void png_push_read_IDAT PNGARG((png_structp png_ptr)); |
| 3150 | PNG_EXTERN void png_process_IDAT_data PNGARG((png_structp png_ptr, |
| 3151 | png_bytep buffer, png_size_t buffer_length)); |
| 3152 | PNG_EXTERN void png_push_process_row PNGARG((png_structp png_ptr)); |
| 3153 | PNG_EXTERN void png_push_handle_unknown PNGARG((png_structp png_ptr, |
| 3154 | png_infop info_ptr, png_uint_32 length)); |
| 3155 | PNG_EXTERN void png_push_have_info PNGARG((png_structp png_ptr, |
| 3156 | png_infop info_ptr)); |
| 3157 | PNG_EXTERN void png_push_have_end PNGARG((png_structp png_ptr, |
| 3158 | png_infop info_ptr)); |
| 3159 | PNG_EXTERN void png_push_have_row PNGARG((png_structp png_ptr, png_bytep row)); |
| 3160 | PNG_EXTERN void png_push_read_end PNGARG((png_structp png_ptr, |
| 3161 | png_infop info_ptr)); |
| 3162 | PNG_EXTERN void png_process_some_data PNGARG((png_structp png_ptr, |
| 3163 | png_infop info_ptr)); |
| 3164 | PNG_EXTERN void png_read_push_finish_row PNGARG((png_structp png_ptr)); |
| 3165 | #if defined(PNG_READ_tEXt_SUPPORTED) |
| 3166 | PNG_EXTERN void png_push_handle_tEXt PNGARG((png_structp png_ptr, |
| 3167 | png_infop info_ptr, png_uint_32 length)); |
| 3168 | PNG_EXTERN void png_push_read_tEXt PNGARG((png_structp png_ptr, |
| 3169 | png_infop info_ptr)); |
Guy Schalnat | 6d76471 | 1995-12-19 03:22:19 -0600 | [diff] [blame] | 3170 | #endif |
| 3171 | #if defined(PNG_READ_zTXt_SUPPORTED) |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 3172 | PNG_EXTERN void png_push_handle_zTXt PNGARG((png_structp png_ptr, |
| 3173 | png_infop info_ptr, png_uint_32 length)); |
| 3174 | PNG_EXTERN void png_push_read_zTXt PNGARG((png_structp png_ptr, |
| 3175 | png_infop info_ptr)); |
Guy Schalnat | 6d76471 | 1995-12-19 03:22:19 -0600 | [diff] [blame] | 3176 | #endif |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame] | 3177 | #if defined(PNG_READ_iTXt_SUPPORTED) |
| 3178 | PNG_EXTERN void png_push_handle_iTXt PNGARG((png_structp png_ptr, |
| 3179 | png_infop info_ptr, png_uint_32 length)); |
| 3180 | PNG_EXTERN void png_push_read_iTXt PNGARG((png_structp png_ptr, |
| 3181 | png_infop info_ptr)); |
| 3182 | #endif |
Guy Schalnat | 6d76471 | 1995-12-19 03:22:19 -0600 | [diff] [blame] | 3183 | |
| 3184 | #endif /* PNG_PROGRESSIVE_READ_SUPPORTED */ |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 3185 | |
Glenn Randers-Pehrson | 2ad31ae | 2000-12-15 08:54:42 -0600 | [diff] [blame] | 3186 | #ifdef PNG_MNG_FEATURES_SUPPORTED |
| 3187 | PNG_EXTERN void png_do_read_intrapixel PNGARG((png_row_infop row_info, |
| 3188 | png_bytep row)); |
| 3189 | PNG_EXTERN void png_do_write_intrapixel PNGARG((png_row_infop row_info, |
| 3190 | png_bytep row)); |
| 3191 | #endif |
| 3192 | |
Glenn Randers-Pehrson | 1fd5fb3 | 2001-05-06 05:34:26 -0500 | [diff] [blame] | 3193 | #if defined(PNG_ASSEMBLER_CODE_SUPPORTED) |
| 3194 | /* png.c */ /* PRIVATE */ |
| 3195 | PNG_EXTERN void png_init_mmx_flags PNGARG((png_structp png_ptr)); |
| 3196 | #endif |
Glenn Randers-Pehrson | 231e687 | 2001-01-12 15:13:06 -0600 | [diff] [blame] | 3197 | /* Maintainer: Put new private prototypes here ^ and in libpngpf.3 */ |
| 3198 | |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 3199 | #endif /* PNG_INTERNAL */ |
| 3200 | |
Andreas Dilger | 02ad0ef | 1997-01-17 01:34:35 -0600 | [diff] [blame] | 3201 | #ifdef __cplusplus |
| 3202 | } |
| 3203 | #endif |
| 3204 | |
Glenn Randers-Pehrson | 1ef65b6 | 2000-05-12 06:19:53 -0500 | [diff] [blame] | 3205 | #endif /* PNG_VERSION_INFO_ONLY */ |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 3206 | /* do not put anything past this line */ |
Glenn Randers-Pehrson | 1394480 | 2000-06-24 07:42:42 -0500 | [diff] [blame] | 3207 | #endif /* PNG_H */ |