Glenn Randers-Pehrson | e647462 | 2006-03-04 16:50:47 -0600 | [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 | b23afad | 2013-07-10 19:30:59 -0500 | [diff] [blame^] | 4 | * libpng version 1.6.3rc01 - July 11, 2013 |
Glenn Randers-Pehrson | 871b1d0 | 2013-03-02 14:58:22 -0600 | [diff] [blame] | 5 | * Copyright (c) 1998-2013 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 | bfbf865 | 2009-06-26 21:46:52 -0500 | [diff] [blame] | 9 | * This code is released under the libpng license (See LICENSE, below) |
Glenn Randers-Pehrson | 3e61d79 | 2009-06-24 09:31:28 -0500 | [diff] [blame] | 10 | * |
Glenn Randers-Pehrson | 4393a9a | 1999-09-17 12:27:26 -0500 | [diff] [blame] | 11 | * Authors and maintainers: |
Glenn Randers-Pehrson | eae8e36 | 2010-03-12 17:36:53 -0600 | [diff] [blame] | 12 | * libpng versions 0.71, May 1995, through 0.88, January 1996: Guy Schalnat |
| 13 | * libpng versions 0.89c, June 1996, through 0.96, May 1997: Andreas Dilger |
Glenn Randers-Pehrson | b23afad | 2013-07-10 19:30:59 -0500 | [diff] [blame^] | 14 | * libpng versions 0.97, January 1998, through 1.6.3rc01 - July 11, 2013: Glenn |
Glenn Randers-Pehrson | eae8e36 | 2010-03-12 17:36:53 -0600 | [diff] [blame] | 15 | * See also "Contributing Authors", below. |
Glenn Randers-Pehrson | 4393a9a | 1999-09-17 12:27:26 -0500 | [diff] [blame] | 16 | * |
Glenn Randers-Pehrson | 520a764 | 2000-03-21 05:13:06 -0600 | [diff] [blame] | 17 | * Note about libpng version numbers: |
| 18 | * |
Glenn Randers-Pehrson | eae8e36 | 2010-03-12 17:36:53 -0600 | [diff] [blame] | 19 | * Due to various miscommunications, unforeseen code incompatibilities |
| 20 | * and occasional factors outside the authors' control, version numbering |
| 21 | * on the library has not always been consistent and straightforward. |
| 22 | * The following table summarizes matters since version 0.89c, which was |
| 23 | * the first widely used release: |
Glenn Randers-Pehrson | 520a764 | 2000-03-21 05:13:06 -0600 | [diff] [blame] | 24 | * |
Glenn Randers-Pehrson | 7529457 | 2000-05-06 14:09:57 -0500 | [diff] [blame] | 25 | * source png.h png.h shared-lib |
| 26 | * version string int version |
| 27 | * ------- ------ ----- ---------- |
| 28 | * 0.89c "1.0 beta 3" 0.89 89 1.0.89 |
| 29 | * 0.90 "1.0 beta 4" 0.90 90 0.90 [should have been 2.0.90] |
| 30 | * 0.95 "1.0 beta 5" 0.95 95 0.95 [should have been 2.0.95] |
| 31 | * 0.96 "1.0 beta 6" 0.96 96 0.96 [should have been 2.0.96] |
| 32 | * 0.97b "1.00.97 beta 7" 1.00.97 97 1.0.1 [should have been 2.0.97] |
| 33 | * 0.97c 0.97 97 2.0.97 |
| 34 | * 0.98 0.98 98 2.0.98 |
| 35 | * 0.99 0.99 98 2.0.99 |
| 36 | * 0.99a-m 0.99 99 2.0.99 |
| 37 | * 1.00 1.00 100 2.1.0 [100 should be 10000] |
| 38 | * 1.0.0 (from here on, the 100 2.1.0 [100 should be 10000] |
| 39 | * 1.0.1 png.h string is 10001 2.1.0 |
| 40 | * 1.0.1a-e identical to the 10002 from here on, the shared library |
| 41 | * 1.0.2 source version) 10002 is 2.V where V is the source code |
| 42 | * 1.0.2a-b 10003 version, except as noted. |
| 43 | * 1.0.3 10003 |
| 44 | * 1.0.3a-d 10004 |
| 45 | * 1.0.4 10004 |
| 46 | * 1.0.4a-f 10005 |
| 47 | * 1.0.5 (+ 2 patches) 10005 |
| 48 | * 1.0.5a-d 10006 |
| 49 | * 1.0.5e-r 10100 (not source compatible) |
| 50 | * 1.0.5s-v 10006 (not binary compatible) |
| 51 | * 1.0.6 (+ 3 patches) 10006 (still binary incompatible) |
| 52 | * 1.0.6d-f 10007 (still binary incompatible) |
| 53 | * 1.0.6g 10007 |
| 54 | * 1.0.6h 10007 10.6h (testing xy.z so-numbering) |
| 55 | * 1.0.6i 10007 10.6i |
| 56 | * 1.0.6j 10007 2.1.0.6j (incompatible with 1.0.0) |
Glenn Randers-Pehrson | be9de0f | 2001-01-22 08:52:16 -0600 | [diff] [blame] | 57 | * 1.0.7beta11-14 DLLNUM 10007 2.1.0.7beta11-14 (binary compatible) |
| 58 | * 1.0.7beta15-18 1 10007 2.1.0.7beta15-18 (binary compatible) |
| 59 | * 1.0.7rc1-2 1 10007 2.1.0.7rc1-2 (binary compatible) |
| 60 | * 1.0.7 1 10007 (still compatible) |
| 61 | * 1.0.8beta1-4 1 10008 2.1.0.8beta1-4 |
| 62 | * 1.0.8rc1 1 10008 2.1.0.8rc1 |
| 63 | * 1.0.8 1 10008 2.1.0.8 |
| 64 | * 1.0.9beta1-6 1 10009 2.1.0.9beta1-6 |
| 65 | * 1.0.9rc1 1 10009 2.1.0.9rc1 |
| 66 | * 1.0.9beta7-10 1 10009 2.1.0.9beta7-10 |
| 67 | * 1.0.9rc2 1 10009 2.1.0.9rc2 |
Glenn Randers-Pehrson | d4e8109 | 2001-01-31 05:56:52 -0600 | [diff] [blame] | 68 | * 1.0.9 1 10009 2.1.0.9 |
Glenn Randers-Pehrson | 1909560 | 2001-03-14 07:08:39 -0600 | [diff] [blame] | 69 | * 1.0.10beta1 1 10010 2.1.0.10beta1 |
Glenn Randers-Pehrson | e164447 | 2001-03-23 05:06:56 -0600 | [diff] [blame] | 70 | * 1.0.10rc1 1 10010 2.1.0.10rc1 |
Glenn Randers-Pehrson | 13cfbac | 2001-03-30 06:42:28 -0600 | [diff] [blame] | 71 | * 1.0.10 1 10010 2.1.0.10 |
Glenn Randers-Pehrson | e1eff58 | 2001-04-14 20:15:41 -0500 | [diff] [blame] | 72 | * 1.0.11beta1-3 1 10011 2.1.0.11beta1-3 |
Glenn Randers-Pehrson | 82ae383 | 2001-04-20 10:32:10 -0500 | [diff] [blame] | 73 | * 1.0.11rc1 1 10011 2.1.0.11rc1 |
Glenn Randers-Pehrson | 3283539 | 2001-04-27 08:29:32 -0500 | [diff] [blame] | 74 | * 1.0.11 1 10011 2.1.0.11 |
Glenn Randers-Pehrson | b182893 | 2001-06-23 08:03:17 -0500 | [diff] [blame] | 75 | * 1.0.12beta1-2 2 10012 2.1.0.12beta1-2 |
| 76 | * 1.0.12rc1 2 10012 2.1.0.12rc1 |
| 77 | * 1.0.12 2 10012 2.1.0.12 |
| 78 | * 1.1.0a-f - 10100 2.1.1.0a-f (branch abandoned) |
Glenn Randers-Pehrson | 8b6a889 | 2001-05-18 04:54:50 -0500 | [diff] [blame] | 79 | * 1.2.0beta1-2 2 10200 2.1.2.0beta1-2 |
Glenn Randers-Pehrson | 5a0be34 | 2001-10-18 20:55:13 -0500 | [diff] [blame] | 80 | * 1.2.0beta3-5 3 10200 3.1.2.0beta3-5 |
| 81 | * 1.2.0rc1 3 10200 3.1.2.0rc1 |
| 82 | * 1.2.0 3 10200 3.1.2.0 |
Glenn Randers-Pehrson | 5cded0b | 2001-11-07 07:10:08 -0600 | [diff] [blame] | 83 | * 1.2.1beta1-4 3 10201 3.1.2.1beta1-4 |
Glenn Randers-Pehrson | db3b88d | 2001-12-04 06:30:43 -0600 | [diff] [blame] | 84 | * 1.2.1rc1-2 3 10201 3.1.2.1rc1-2 |
| 85 | * 1.2.1 3 10201 3.1.2.1 |
Glenn Randers-Pehrson | 25228ab | 2002-03-31 07:33:55 -0600 | [diff] [blame] | 86 | * 1.2.2beta1-6 12 10202 12.so.0.1.2.2beta1-6 |
Glenn Randers-Pehrson | fcbd787 | 2002-04-07 16:35:38 -0500 | [diff] [blame] | 87 | * 1.0.13beta1 10 10013 10.so.0.1.0.13beta1 |
| 88 | * 1.0.13rc1 10 10013 10.so.0.1.0.13rc1 |
| 89 | * 1.2.2rc1 12 10202 12.so.0.1.2.2rc1 |
Glenn Randers-Pehrson | 4fb046a | 2002-04-15 09:25:51 -0500 | [diff] [blame] | 90 | * 1.0.13 10 10013 10.so.0.1.0.13 |
| 91 | * 1.2.2 12 10202 12.so.0.1.2.2 |
Glenn Randers-Pehrson | 22f2896 | 2002-05-13 18:17:09 -0500 | [diff] [blame] | 92 | * 1.2.3rc1-6 12 10203 12.so.0.1.2.3rc1-6 |
| 93 | * 1.2.3 12 10203 12.so.0.1.2.3 |
Glenn Randers-Pehrson | d020e9d | 2002-06-28 09:34:00 -0500 | [diff] [blame] | 94 | * 1.2.4beta1-3 13 10204 12.so.0.1.2.4beta1-3 |
Glenn Randers-Pehrson | 2ae022d | 2002-07-01 22:23:46 -0500 | [diff] [blame] | 95 | * 1.0.14rc1 13 10014 10.so.0.1.0.14rc1 |
| 96 | * 1.2.4rc1 13 10204 12.so.0.1.2.4rc1 |
Glenn Randers-Pehrson | 484a8a1 | 2002-07-07 19:15:20 -0500 | [diff] [blame] | 97 | * 1.0.14 10 10014 10.so.0.1.0.14 |
| 98 | * 1.2.4 13 10204 12.so.0.1.2.4 |
Glenn Randers-Pehrson | 51d9250 | 2002-08-23 23:07:42 -0500 | [diff] [blame] | 99 | * 1.2.5beta1-2 13 10205 12.so.0.1.2.5beta1-2 |
Glenn Randers-Pehrson | 5ff38d3 | 2002-09-17 23:38:46 -0500 | [diff] [blame] | 100 | * 1.0.15rc1-3 10 10015 10.so.0.1.0.15rc1-3 |
Glenn Randers-Pehrson | 0cc2f95 | 2002-10-03 06:32:37 -0500 | [diff] [blame] | 101 | * 1.2.5rc1-3 13 10205 12.so.0.1.2.5rc1-3 |
| 102 | * 1.0.15 10 10015 10.so.0.1.0.15 |
| 103 | * 1.2.5 13 10205 12.so.0.1.2.5 |
Glenn Randers-Pehrson | 5fea36f | 2004-07-28 08:20:44 -0500 | [diff] [blame] | 104 | * 1.2.6beta1-4 13 10206 12.so.0.1.2.6beta1-4 |
Glenn Randers-Pehrson | 37f116a | 2004-08-15 07:15:39 -0500 | [diff] [blame] | 105 | * 1.0.16 10 10016 10.so.0.1.0.16 |
| 106 | * 1.2.6 13 10206 12.so.0.1.2.6 |
Glenn Randers-Pehrson | 67864af | 2004-08-28 23:30:07 -0500 | [diff] [blame] | 107 | * 1.2.7beta1-2 13 10207 12.so.0.1.2.7beta1-2 |
Glenn Randers-Pehrson | 5b77916 | 2004-09-04 13:25:08 -0500 | [diff] [blame] | 108 | * 1.0.17rc1 10 10017 12.so.0.1.0.17rc1 |
| 109 | * 1.2.7rc1 13 10207 12.so.0.1.2.7rc1 |
Glenn Randers-Pehrson | 250dfe1 | 2004-09-11 21:19:54 -0500 | [diff] [blame] | 110 | * 1.0.17 10 10017 12.so.0.1.0.17 |
| 111 | * 1.2.7 13 10207 12.so.0.1.2.7 |
Glenn Randers-Pehrson | 4093607 | 2004-11-20 11:18:40 -0600 | [diff] [blame] | 112 | * 1.2.8beta1-5 13 10208 12.so.0.1.2.8beta1-5 |
Glenn Randers-Pehrson | 584b96e | 2004-11-29 15:08:00 -0600 | [diff] [blame] | 113 | * 1.0.18rc1-5 10 10018 12.so.0.1.0.18rc1-5 |
| 114 | * 1.2.8rc1-5 13 10208 12.so.0.1.2.8rc1-5 |
Glenn Randers-Pehrson | 917648e | 2004-12-02 18:14:51 -0600 | [diff] [blame] | 115 | * 1.0.18 10 10018 12.so.0.1.0.18 |
| 116 | * 1.2.8 13 10208 12.so.0.1.2.8 |
Glenn Randers-Pehrson | e647462 | 2006-03-04 16:50:47 -0600 | [diff] [blame] | 117 | * 1.2.9beta1-3 13 10209 12.so.0.1.2.9beta1-3 |
Glenn Randers-Pehrson | 4deeb79 | 2006-03-22 16:21:59 -0600 | [diff] [blame] | 118 | * 1.2.9beta4-11 13 10209 12.so.0.9[.0] |
Glenn Randers-Pehrson | 3a51203 | 2006-03-31 05:29:33 -0600 | [diff] [blame] | 119 | * 1.2.9rc1 13 10209 12.so.0.9[.0] |
Glenn Randers-Pehrson | a7d0c94 | 2006-04-14 06:22:52 -0500 | [diff] [blame] | 120 | * 1.2.9 13 10209 12.so.0.9[.0] |
Glenn Randers-Pehrson | d60b8fa | 2006-04-20 21:31:14 -0500 | [diff] [blame] | 121 | * 1.2.10beta1-7 13 10210 12.so.0.10[.0] |
Glenn Randers-Pehrson | 1721829 | 2006-04-20 07:20:46 -0500 | [diff] [blame] | 122 | * 1.2.10rc1-2 13 10210 12.so.0.10[.0] |
Glenn Randers-Pehrson | 86dc981 | 2006-05-10 07:27:44 -0500 | [diff] [blame] | 123 | * 1.2.10 13 10210 12.so.0.10[.0] |
Glenn Randers-Pehrson | 73b064c | 2006-05-15 06:44:21 -0500 | [diff] [blame] | 124 | * 1.4.0beta1-5 14 10400 14.so.0.0[.0] |
Glenn Randers-Pehrson | 7824a70 | 2009-06-13 10:05:05 -0500 | [diff] [blame] | 125 | * 1.2.11beta1-4 13 10211 12.so.0.11[.0] |
Glenn Randers-Pehrson | 3424ee7 | 2006-07-12 13:33:47 -0500 | [diff] [blame] | 126 | * 1.4.0beta7-8 14 10400 14.so.0.0[.0] |
Glenn Randers-Pehrson | 7aa1834 | 2009-06-05 17:24:17 -0500 | [diff] [blame] | 127 | * 1.2.11 13 10211 12.so.0.11[.0] |
| 128 | * 1.2.12 13 10212 12.so.0.12[.0] |
Glenn Randers-Pehrson | 701dbaa | 2006-11-17 09:36:54 -0600 | [diff] [blame] | 129 | * 1.4.0beta9-14 14 10400 14.so.0.0[.0] |
Glenn Randers-Pehrson | 7aa1834 | 2009-06-05 17:24:17 -0500 | [diff] [blame] | 130 | * 1.2.13 13 10213 12.so.0.13[.0] |
Glenn Randers-Pehrson | 97a9b48 | 2008-10-25 20:03:28 -0500 | [diff] [blame] | 131 | * 1.4.0beta15-36 14 10400 14.so.0.0[.0] |
Glenn Randers-Pehrson | fa02810 | 2009-10-10 06:15:21 -0500 | [diff] [blame] | 132 | * 1.4.0beta37-87 14 10400 14.so.14.0[.0] |
Glenn Randers-Pehrson | 733da8c | 2009-10-30 00:00:15 -0500 | [diff] [blame] | 133 | * 1.4.0rc01 14 10400 14.so.14.0[.0] |
Glenn Randers-Pehrson | 62ca98e | 2009-12-20 15:14:57 -0600 | [diff] [blame] | 134 | * 1.4.0beta88-109 14 10400 14.so.14.0[.0] |
Glenn Randers-Pehrson | 67a83db | 2010-01-01 18:26:18 -0600 | [diff] [blame] | 135 | * 1.4.0rc02-08 14 10400 14.so.14.0[.0] |
Glenn Randers-Pehrson | 7520224 | 2009-12-25 14:25:29 -0600 | [diff] [blame] | 136 | * 1.4.0 14 10400 14.so.14.0[.0] |
Glenn Randers-Pehrson | e3f3c4e | 2010-02-07 18:08:50 -0600 | [diff] [blame] | 137 | * 1.4.1beta01-03 14 10401 14.so.14.1[.0] |
| 138 | * 1.4.1rc01 14 10401 14.so.14.1[.0] |
Glenn Randers-Pehrson | 7a5be53 | 2010-02-14 07:16:19 -0600 | [diff] [blame] | 139 | * 1.4.1beta04-12 14 10401 14.so.14.1[.0] |
Glenn Randers-Pehrson | aaf377c | 2010-03-08 11:20:30 -0600 | [diff] [blame] | 140 | * 1.4.1 14 10401 14.so.14.1[.0] |
Glenn Randers-Pehrson | 5b3d554 | 2010-06-18 21:55:53 -0500 | [diff] [blame] | 141 | * 1.4.2 14 10402 14.so.14.2[.0] |
| 142 | * 1.4.3 14 10403 14.so.14.3[.0] |
Glenn Randers-Pehrson | 2776d5e | 2010-11-21 15:18:02 -0600 | [diff] [blame] | 143 | * 1.4.4 14 10404 14.so.14.4[.0] |
Glenn Randers-Pehrson | fd20a5a | 2010-12-27 08:53:08 -0600 | [diff] [blame] | 144 | * 1.5.0beta01-58 15 10500 15.so.15.0[.0] |
Glenn Randers-Pehrson | 64b863c | 2011-01-04 09:57:06 -0600 | [diff] [blame] | 145 | * 1.5.0rc01-07 15 10500 15.so.15.0[.0] |
Glenn Randers-Pehrson | f5ea1b7 | 2011-01-06 06:42:51 -0600 | [diff] [blame] | 146 | * 1.5.0 15 10500 15.so.15.0[.0] |
Glenn Randers-Pehrson | ef123cc | 2011-01-28 15:20:34 -0600 | [diff] [blame] | 147 | * 1.5.1beta01-11 15 10501 15.so.15.1[.0] |
Glenn Randers-Pehrson | 3d3aae1 | 2011-02-02 22:58:27 -0600 | [diff] [blame] | 148 | * 1.5.1rc01-02 15 10501 15.so.15.1[.0] |
| 149 | * 1.5.1 15 10501 15.so.15.1[.0] |
Glenn Randers-Pehrson | f3dd1cc | 2011-03-18 22:02:20 -0500 | [diff] [blame] | 150 | * 1.5.2beta01-03 15 10502 15.so.15.2[.0] |
Glenn Randers-Pehrson | 77fd083 | 2011-03-24 08:59:48 -0500 | [diff] [blame] | 151 | * 1.5.2rc01-03 15 10502 15.so.15.2[.0] |
Glenn Randers-Pehrson | dcc3505 | 2011-03-31 11:23:49 -0500 | [diff] [blame] | 152 | * 1.5.2 15 10502 15.so.15.2[.0] |
Glenn Randers-Pehrson | 36edbb5 | 2011-06-03 07:15:04 -0500 | [diff] [blame] | 153 | * 1.5.3beta01-10 15 10503 15.so.15.3[.0] |
Glenn Randers-Pehrson | fb27873 | 2011-06-10 20:43:39 -0500 | [diff] [blame] | 154 | * 1.5.3rc01-02 15 10503 15.so.15.3[.0] |
Glenn Randers-Pehrson | 413138a | 2011-06-13 22:07:37 -0500 | [diff] [blame] | 155 | * 1.5.3beta11 15 10503 15.so.15.3[.0] |
| 156 | * 1.5.3 [omitted] |
Glenn Randers-Pehrson | 9daf91e | 2011-06-22 23:10:36 -0500 | [diff] [blame] | 157 | * 1.5.4beta01-08 15 10504 15.so.15.4[.0] |
Glenn Randers-Pehrson | 78bb9da | 2011-06-30 18:59:45 -0500 | [diff] [blame] | 158 | * 1.5.4rc01 15 10504 15.so.15.4[.0] |
Glenn Randers-Pehrson | d404b6d | 2011-07-07 06:24:57 -0500 | [diff] [blame] | 159 | * 1.5.4 15 10504 15.so.15.4[.0] |
Glenn Randers-Pehrson | 3c2ae60 | 2011-09-09 06:02:09 -0500 | [diff] [blame] | 160 | * 1.5.5beta01-08 15 10505 15.so.15.5[.0] |
| 161 | * 1.5.5rc01 15 10505 15.so.15.5[.0] |
Glenn Randers-Pehrson | 3e2263a | 2011-09-22 08:40:32 -0500 | [diff] [blame] | 162 | * 1.5.5 15 10505 15.so.15.5[.0] |
Glenn Randers-Pehrson | 93254f6 | 2011-10-26 08:36:21 -0500 | [diff] [blame] | 163 | * 1.5.6beta01-07 15 10506 15.so.15.6[.0] |
Glenn Randers-Pehrson | bc6726b | 2011-11-02 22:43:00 -0500 | [diff] [blame] | 164 | * 1.5.6rc01-03 15 10506 15.so.15.6[.0] |
| 165 | * 1.5.6 15 10506 15.so.15.6[.0] |
Glenn Randers-Pehrson | 36251d3 | 2011-11-17 21:14:34 -0600 | [diff] [blame] | 166 | * 1.5.7beta01-05 15 10507 15.so.15.7[.0] |
Glenn Randers-Pehrson | b74fb4e | 2011-12-21 08:37:46 -0600 | [diff] [blame] | 167 | * 1.5.7rc01-03 15 10507 15.so.15.7[.0] |
| 168 | * 1.5.7 15 10507 15.so.15.7[.0] |
Glenn Randers-Pehrson | 871b1d0 | 2013-03-02 14:58:22 -0600 | [diff] [blame] | 169 | * 1.6.0beta01-40 16 10600 16.so.16.0[.0] |
| 170 | * 1.6.0rc01-08 16 10600 16.so.16.0[.0] |
| 171 | * 1.6.0 16 10600 16.so.16.0[.0] |
Glenn Randers-Pehrson | 3a83aa3 | 2013-03-29 06:56:45 -0500 | [diff] [blame] | 172 | * 1.6.1beta01-09 16 10601 16.so.16.1[.0] |
Glenn Randers-Pehrson | 4e6e216 | 2013-03-21 07:27:01 -0500 | [diff] [blame] | 173 | * 1.6.1rc01 16 10601 16.so.16.1[.0] |
Glenn Randers-Pehrson | 5087805 | 2013-03-27 20:31:36 -0500 | [diff] [blame] | 174 | * 1.6.1 16 10601 16.so.16.1[.0] |
Glenn Randers-Pehrson | 0794df4 | 2013-04-18 06:23:26 -0500 | [diff] [blame] | 175 | * 1.6.2beta01 16 10602 16.so.16.2[.0] |
Glenn Randers-Pehrson | 0ee3465 | 2013-04-23 22:17:03 -0500 | [diff] [blame] | 176 | * 1.6.2rc01-06 16 10602 16.so.16.2[.0] |
Glenn Randers-Pehrson | 809355b | 2013-04-25 07:24:46 -0500 | [diff] [blame] | 177 | * 1.6.2 16 10602 16.so.16.2[.0] |
Glenn Randers-Pehrson | b23afad | 2013-07-10 19:30:59 -0500 | [diff] [blame^] | 178 | * 1.6.3beta01-11 16 10603 16.so.16.3[.0] |
| 179 | * 1.6.3rc01 16 10603 16.so.16.3[.0] |
Glenn Randers-Pehrson | 520a764 | 2000-03-21 05:13:06 -0600 | [diff] [blame] | 180 | * |
Glenn Randers-Pehrson | eae8e36 | 2010-03-12 17:36:53 -0600 | [diff] [blame] | 181 | * Henceforth the source version will match the shared-library major |
| 182 | * and minor numbers; the shared-library major version number will be |
| 183 | * used for changes in backward compatibility, as it is intended. The |
| 184 | * PNG_LIBPNG_VER macro, which is not used within libpng but is available |
| 185 | * for applications, is an unsigned integer of the form xyyzz corresponding |
| 186 | * to the source version x.y.z (leading zeros in y and z). Beta versions |
| 187 | * were given the previous public release number plus a letter, until |
| 188 | * version 1.0.6j; from then on they were given the upcoming public |
Glenn Randers-Pehrson | 871b1d0 | 2013-03-02 14:58:22 -0600 | [diff] [blame] | 189 | * release number plus "betaNN" or "rcNN". |
Glenn Randers-Pehrson | 520a764 | 2000-03-21 05:13:06 -0600 | [diff] [blame] | 190 | * |
Glenn Randers-Pehrson | eae8e36 | 2010-03-12 17:36:53 -0600 | [diff] [blame] | 191 | * Binary incompatibility exists only when applications make direct access |
| 192 | * to the info_ptr or png_ptr members through png.h, and the compiled |
| 193 | * application is loaded with a different version of the library. |
Glenn Randers-Pehrson | 326320e | 2000-04-24 07:43:17 -0500 | [diff] [blame] | 194 | * |
Glenn Randers-Pehrson | eae8e36 | 2010-03-12 17:36:53 -0600 | [diff] [blame] | 195 | * DLLNUM will change each time there are forward or backward changes |
| 196 | * in binary compatibility (e.g., when a new feature is added). |
Glenn Randers-Pehrson | be9de0f | 2001-01-22 08:52:16 -0600 | [diff] [blame] | 197 | * |
Glenn Randers-Pehrson | f3abb2c | 2010-10-17 12:51:53 -0500 | [diff] [blame] | 198 | * See libpng-manual.txt or libpng.3 for more information. The PNG |
| 199 | * specification is available as a W3C Recommendation and as an ISO |
| 200 | * Specification, <http://www.w3.org/TR/2003/REC-PNG-20031110/ |
Glenn Randers-Pehrson | 520a764 | 2000-03-21 05:13:06 -0600 | [diff] [blame] | 201 | */ |
| 202 | |
| 203 | /* |
Glenn Randers-Pehrson | 68ea243 | 2000-04-01 21:10:05 -0600 | [diff] [blame] | 204 | * COPYRIGHT NOTICE, DISCLAIMER, and LICENSE: |
| 205 | * |
Glenn Randers-Pehrson | d436672 | 2000-06-04 14:29:29 -0500 | [diff] [blame] | 206 | * If you modify libpng you may insert additional notices immediately following |
| 207 | * this sentence. |
Glenn Randers-Pehrson | 520a764 | 2000-03-21 05:13:06 -0600 | [diff] [blame] | 208 | * |
Glenn Randers-Pehrson | bfbf865 | 2009-06-26 21:46:52 -0500 | [diff] [blame] | 209 | * This code is released under the libpng license. |
| 210 | * |
Glenn Randers-Pehrson | b23afad | 2013-07-10 19:30:59 -0500 | [diff] [blame^] | 211 | * libpng versions 1.2.6, August 15, 2004, through 1.6.3rc01, July 11, 2013, are |
Glenn Randers-Pehrson | 871b1d0 | 2013-03-02 14:58:22 -0600 | [diff] [blame] | 212 | * Copyright (c) 2004, 2006-2013 Glenn Randers-Pehrson, and are |
Glenn Randers-Pehrson | 5fea36f | 2004-07-28 08:20:44 -0500 | [diff] [blame] | 213 | * distributed according to the same disclaimer and license as libpng-1.2.5 |
Glenn Randers-Pehrson | a4981d4 | 2004-08-25 22:00:45 -0500 | [diff] [blame] | 214 | * with the following individual added to the list of Contributing Authors: |
Glenn Randers-Pehrson | 5fea36f | 2004-07-28 08:20:44 -0500 | [diff] [blame] | 215 | * |
| 216 | * Cosmin Truta |
Glenn Randers-Pehrson | 5fea36f | 2004-07-28 08:20:44 -0500 | [diff] [blame] | 217 | * |
Glenn Randers-Pehrson | a4981d4 | 2004-08-25 22:00:45 -0500 | [diff] [blame] | 218 | * libpng versions 1.0.7, July 1, 2000, through 1.2.5, October 3, 2002, are |
Glenn Randers-Pehrson | 5fea36f | 2004-07-28 08:20:44 -0500 | [diff] [blame] | 219 | * Copyright (c) 2000-2002 Glenn Randers-Pehrson, and are |
Glenn Randers-Pehrson | 32fc5ce | 2000-07-24 06:34:14 -0500 | [diff] [blame] | 220 | * distributed according to the same disclaimer and license as libpng-1.0.6 |
Glenn Randers-Pehrson | a4981d4 | 2004-08-25 22:00:45 -0500 | [diff] [blame] | 221 | * with the following individuals added to the list of Contributing Authors: |
Glenn Randers-Pehrson | d436672 | 2000-06-04 14:29:29 -0500 | [diff] [blame] | 222 | * |
| 223 | * Simon-Pierre Cadieux |
| 224 | * Eric S. Raymond |
| 225 | * Gilles Vollant |
| 226 | * |
Glenn Randers-Pehrson | 3d5a520 | 2000-07-01 15:37:28 -0500 | [diff] [blame] | 227 | * and with the following additions to the disclaimer: |
| 228 | * |
| 229 | * There is no warranty against interference with your enjoyment of the |
| 230 | * library or against infringement. There is no warranty that our |
| 231 | * efforts or the library will fulfill any of your particular purposes |
| 232 | * or needs. This library is provided with all faults, and the entire |
| 233 | * risk of satisfactory quality, performance, accuracy, and effort is with |
| 234 | * the user. |
| 235 | * |
| 236 | * libpng versions 0.97, January 1998, through 1.0.6, March 20, 2000, are |
Glenn Randers-Pehrson | a4981d4 | 2004-08-25 22:00:45 -0500 | [diff] [blame] | 237 | * Copyright (c) 1998, 1999, 2000 Glenn Randers-Pehrson, and are |
Glenn Randers-Pehrson | c36bb79 | 2011-02-12 09:49:07 -0600 | [diff] [blame] | 238 | * distributed according to the same disclaimer and license as libpng-0.96, |
Glenn Randers-Pehrson | d436672 | 2000-06-04 14:29:29 -0500 | [diff] [blame] | 239 | * with the following individuals added to the list of Contributing Authors: |
| 240 | * |
| 241 | * Tom Lane |
| 242 | * Glenn Randers-Pehrson |
| 243 | * Willem van Schaik |
| 244 | * |
| 245 | * 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] | 246 | * Copyright (c) 1996, 1997 Andreas Dilger |
Glenn Randers-Pehrson | c36bb79 | 2011-02-12 09:49:07 -0600 | [diff] [blame] | 247 | * Distributed according to the same disclaimer and license as libpng-0.88, |
Glenn Randers-Pehrson | d436672 | 2000-06-04 14:29:29 -0500 | [diff] [blame] | 248 | * with the following individuals added to the list of Contributing Authors: |
Glenn Randers-Pehrson | 520a764 | 2000-03-21 05:13:06 -0600 | [diff] [blame] | 249 | * |
| 250 | * John Bowler |
| 251 | * Kevin Bracey |
| 252 | * Sam Bushell |
Glenn Randers-Pehrson | 520a764 | 2000-03-21 05:13:06 -0600 | [diff] [blame] | 253 | * Magnus Holmgren |
Glenn Randers-Pehrson | 520a764 | 2000-03-21 05:13:06 -0600 | [diff] [blame] | 254 | * Greg Roelofs |
Glenn Randers-Pehrson | d436672 | 2000-06-04 14:29:29 -0500 | [diff] [blame] | 255 | * Tom Tanner |
| 256 | * |
| 257 | * libpng versions 0.5, May 1995, through 0.88, January 1996, are |
| 258 | * Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc. |
| 259 | * |
| 260 | * For the purposes of this copyright and license, "Contributing Authors" |
| 261 | * is defined as the following set of individuals: |
| 262 | * |
| 263 | * Andreas Dilger |
| 264 | * Dave Martindale |
Glenn Randers-Pehrson | 520a764 | 2000-03-21 05:13:06 -0600 | [diff] [blame] | 265 | * Guy Eric Schalnat |
| 266 | * Paul Schmidt |
Glenn Randers-Pehrson | 520a764 | 2000-03-21 05:13:06 -0600 | [diff] [blame] | 267 | * Tim Wegner |
| 268 | * |
| 269 | * The PNG Reference Library is supplied "AS IS". The Contributing Authors |
Glenn Randers-Pehrson | c36bb79 | 2011-02-12 09:49:07 -0600 | [diff] [blame] | 270 | * and Group 42, Inc. disclaim all warranties, expressed or implied, |
Glenn Randers-Pehrson | 520a764 | 2000-03-21 05:13:06 -0600 | [diff] [blame] | 271 | * including, without limitation, the warranties of merchantability and of |
| 272 | * fitness for any purpose. The Contributing Authors and Group 42, Inc. |
Glenn Randers-Pehrson | c36bb79 | 2011-02-12 09:49:07 -0600 | [diff] [blame] | 273 | * assume no liability for direct, indirect, incidental, special, exemplary, |
Glenn Randers-Pehrson | 520a764 | 2000-03-21 05:13:06 -0600 | [diff] [blame] | 274 | * or consequential damages, which may result from the use of the PNG |
| 275 | * Reference Library, even if advised of the possibility of such damage. |
| 276 | * |
| 277 | * Permission is hereby granted to use, copy, modify, and distribute this |
| 278 | * source code, or portions hereof, for any purpose, without fee, subject |
| 279 | * to the following restrictions: |
| 280 | * |
Glenn Randers-Pehrson | eae8e36 | 2010-03-12 17:36:53 -0600 | [diff] [blame] | 281 | * 1. The origin of this source code must not be misrepresented. |
Glenn Randers-Pehrson | 520a764 | 2000-03-21 05:13:06 -0600 | [diff] [blame] | 282 | * |
Glenn Randers-Pehrson | 53c07f5 | 2010-06-18 18:55:55 -0500 | [diff] [blame] | 283 | * 2. Altered versions must be plainly marked as such and must not |
| 284 | * be misrepresented as being the original source. |
Glenn Randers-Pehrson | 520a764 | 2000-03-21 05:13:06 -0600 | [diff] [blame] | 285 | * |
Glenn Randers-Pehrson | eae8e36 | 2010-03-12 17:36:53 -0600 | [diff] [blame] | 286 | * 3. This Copyright notice may not be removed or altered from |
| 287 | * any source or altered source distribution. |
Glenn Randers-Pehrson | 520a764 | 2000-03-21 05:13:06 -0600 | [diff] [blame] | 288 | * |
| 289 | * The Contributing Authors and Group 42, Inc. specifically permit, without |
| 290 | * fee, and encourage the use of this source code as a component to |
| 291 | * supporting the PNG file format in commercial products. If you use this |
| 292 | * source code in a product, acknowledgment is not required but would be |
| 293 | * appreciated. |
| 294 | */ |
| 295 | |
| 296 | /* |
| 297 | * A "png_get_copyright" function is available, for convenient use in "about" |
| 298 | * boxes and the like: |
| 299 | * |
Glenn Randers-Pehrson | 23d3970 | 2010-12-06 18:28:02 -0600 | [diff] [blame] | 300 | * printf("%s", png_get_copyright(NULL)); |
Glenn Randers-Pehrson | 520a764 | 2000-03-21 05:13:06 -0600 | [diff] [blame] | 301 | * |
| 302 | * 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] | 303 | * files "pngbar.png" and "pngbar.jpg (88x31) and "pngnow.png" (98x31). |
Glenn Randers-Pehrson | 520a764 | 2000-03-21 05:13:06 -0600 | [diff] [blame] | 304 | */ |
| 305 | |
| 306 | /* |
| 307 | * Libpng is OSI Certified Open Source Software. OSI Certified is a |
| 308 | * certification mark of the Open Source Initiative. |
| 309 | */ |
| 310 | |
| 311 | /* |
| 312 | * The contributing authors would like to thank all those who helped |
| 313 | * with testing, bug fixes, and patience. This wouldn't have been |
| 314 | * possible without all of you. |
| 315 | * |
| 316 | * Thanks to Frank J. T. Wojcik for helping with the documentation. |
| 317 | */ |
| 318 | |
| 319 | /* |
Glenn Randers-Pehrson | 87544ac | 1999-01-13 22:06:39 -0600 | [diff] [blame] | 320 | * Y2K compliance in libpng: |
| 321 | * ========================= |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame] | 322 | * |
Glenn Randers-Pehrson | b23afad | 2013-07-10 19:30:59 -0500 | [diff] [blame^] | 323 | * July 11, 2013 |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame] | 324 | * |
Glenn Randers-Pehrson | 87544ac | 1999-01-13 22:06:39 -0600 | [diff] [blame] | 325 | * Since the PNG Development group is an ad-hoc body, we can't make |
| 326 | * an official declaration. |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame] | 327 | * |
Glenn Randers-Pehrson | 4393a9a | 1999-09-17 12:27:26 -0500 | [diff] [blame] | 328 | * This is your unofficial assurance that libpng from version 0.71 and |
Glenn Randers-Pehrson | b23afad | 2013-07-10 19:30:59 -0500 | [diff] [blame^] | 329 | * upward through 1.6.3rc01 are Y2K compliant. It is my belief that |
Glenn Randers-Pehrson | 31aee0d | 2010-07-29 17:39:14 -0500 | [diff] [blame] | 330 | * earlier versions were also Y2K compliant. |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame] | 331 | * |
John Bowler | 88b77cc | 2011-05-05 06:49:55 -0500 | [diff] [blame] | 332 | * Libpng only has two year fields. One is a 2-byte unsigned integer |
Glenn Randers-Pehrson | 871b1d0 | 2013-03-02 14:58:22 -0600 | [diff] [blame] | 333 | * that will hold years up to 65535. The other, which is deprecated, |
| 334 | * holds the date in text format, and will hold years up to 9999. |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame] | 335 | * |
Glenn Randers-Pehrson | 87544ac | 1999-01-13 22:06:39 -0600 | [diff] [blame] | 336 | * The integer is |
| 337 | * "png_uint_16 year" in png_time_struct. |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame] | 338 | * |
John Bowler | 88b77cc | 2011-05-05 06:49:55 -0500 | [diff] [blame] | 339 | * The string is |
Glenn Randers-Pehrson | 871b1d0 | 2013-03-02 14:58:22 -0600 | [diff] [blame] | 340 | * "char time_buffer[29]" in png_struct. This is no longer used |
| 341 | * in libpng-1.6.x and will be removed from libpng-1.7.0. |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame] | 342 | * |
Glenn Randers-Pehrson | 87544ac | 1999-01-13 22:06:39 -0600 | [diff] [blame] | 343 | * There are seven time-related functions: |
Glenn Randers-Pehrson | 871b1d0 | 2013-03-02 14:58:22 -0600 | [diff] [blame] | 344 | * png.c: png_convert_to_rfc_1123_buffer() in png.c |
| 345 | * (formerly png_convert_to_rfc_1123() prior to libpng-1.5.x and |
| 346 | * png_convert_to_rfc_1152() in error prior to libpng-0.98) |
Glenn Randers-Pehrson | 87544ac | 1999-01-13 22:06:39 -0600 | [diff] [blame] | 347 | * png_convert_from_struct_tm() in pngwrite.c, called in pngwrite.c |
| 348 | * png_convert_from_time_t() in pngwrite.c |
| 349 | * png_get_tIME() in pngget.c |
| 350 | * png_handle_tIME() in pngrutil.c, called in pngread.c |
| 351 | * png_set_tIME() in pngset.c |
| 352 | * png_write_tIME() in pngwutil.c, called in pngwrite.c |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame] | 353 | * |
| 354 | * All handle dates properly in a Y2K environment. The |
Glenn Randers-Pehrson | 87544ac | 1999-01-13 22:06:39 -0600 | [diff] [blame] | 355 | * png_convert_from_time_t() function calls gmtime() to convert from system |
| 356 | * clock time, which returns (year - 1900), which we properly convert to |
Glenn Randers-Pehrson | 871b1d0 | 2013-03-02 14:58:22 -0600 | [diff] [blame] | 357 | * the full 4-digit year. There is a possibility that libpng applications |
| 358 | * are not passing 4-digit years into the png_convert_to_rfc_1123_buffer() |
Glenn Randers-Pehrson | 4393a9a | 1999-09-17 12:27:26 -0500 | [diff] [blame] | 359 | * function, or that they are incorrectly passing only a 2-digit year |
Glenn Randers-Pehrson | c36bb79 | 2011-02-12 09:49:07 -0600 | [diff] [blame] | 360 | * instead of "year - 1900" into the png_convert_from_struct_tm() function, |
Glenn Randers-Pehrson | 4393a9a | 1999-09-17 12:27:26 -0500 | [diff] [blame] | 361 | * but this is not under our control. The libpng documentation has always |
| 362 | * stated that it works with 4-digit years, and the APIs have been |
| 363 | * documented as such. |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame] | 364 | * |
Glenn Randers-Pehrson | 87544ac | 1999-01-13 22:06:39 -0600 | [diff] [blame] | 365 | * The tIME chunk itself is also Y2K compliant. It uses a 2-byte unsigned |
| 366 | * 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] | 367 | * |
Glenn Randers-Pehrson | 4393a9a | 1999-09-17 12:27:26 -0500 | [diff] [blame] | 368 | * zlib, upon which libpng depends, is also Y2K compliant. It contains |
| 369 | * no date-related code. |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame] | 370 | * |
Glenn Randers-Pehrson | 87544ac | 1999-01-13 22:06:39 -0600 | [diff] [blame] | 371 | * Glenn Randers-Pehrson |
| 372 | * libpng maintainer |
| 373 | * PNG Development Group |
Glenn Randers-Pehrson | bcfd15d | 1999-10-01 14:22:25 -0500 | [diff] [blame] | 374 | */ |
| 375 | |
Glenn Randers-Pehrson | 1394480 | 2000-06-24 07:42:42 -0500 | [diff] [blame] | 376 | #ifndef PNG_H |
| 377 | #define PNG_H |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 378 | |
Glenn Randers-Pehrson | f3abb2c | 2010-10-17 12:51:53 -0500 | [diff] [blame] | 379 | /* This is not the place to learn how to use libpng. The file libpng-manual.txt |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 380 | * describes how to use libpng, and the file example.c summarizes it |
| 381 | * with some code on which to build. This file is useful for looking |
| 382 | * at the actual function definitions and structure components. |
John Bowler | 7875d53 | 2011-11-07 22:33:49 -0600 | [diff] [blame] | 383 | * |
| 384 | * If you just need to read a PNG file and don't want to read the documentation |
| 385 | * skip to the end of this file and read the section entitled 'simplified API'. |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 386 | */ |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 387 | |
Glenn Randers-Pehrson | 1ef65b6 | 2000-05-12 06:19:53 -0500 | [diff] [blame] | 388 | /* Version information for png.h - this should match the version in png.c */ |
Glenn Randers-Pehrson | b23afad | 2013-07-10 19:30:59 -0500 | [diff] [blame^] | 389 | #define PNG_LIBPNG_VER_STRING "1.6.3rc01" |
Glenn Randers-Pehrson | 5b5dcf8 | 2004-07-17 22:45:44 -0500 | [diff] [blame] | 390 | #define PNG_HEADER_VERSION_STRING \ |
Glenn Randers-Pehrson | b23afad | 2013-07-10 19:30:59 -0500 | [diff] [blame^] | 391 | " libpng version 1.6.3rc01 - July 11, 2013\n" |
Glenn Randers-Pehrson | 1ef65b6 | 2000-05-12 06:19:53 -0500 | [diff] [blame] | 392 | |
Glenn Randers-Pehrson | 7455cbf | 2011-11-24 14:40:36 -0600 | [diff] [blame] | 393 | #define PNG_LIBPNG_VER_SONUM 16 |
| 394 | #define PNG_LIBPNG_VER_DLLNUM 16 |
Glenn Randers-Pehrson | 1ef65b6 | 2000-05-12 06:19:53 -0500 | [diff] [blame] | 395 | |
| 396 | /* These should match the first 3 components of PNG_LIBPNG_VER_STRING: */ |
| 397 | #define PNG_LIBPNG_VER_MAJOR 1 |
Glenn Randers-Pehrson | 87fadd5 | 2011-11-24 14:35:13 -0600 | [diff] [blame] | 398 | #define PNG_LIBPNG_VER_MINOR 6 |
Glenn Randers-Pehrson | 3f677d1 | 2013-04-25 09:12:51 -0500 | [diff] [blame] | 399 | #define PNG_LIBPNG_VER_RELEASE 3 |
Glenn Randers-Pehrson | 87fadd5 | 2011-11-24 14:35:13 -0600 | [diff] [blame] | 400 | |
Glenn Randers-Pehrson | 1ef65b6 | 2000-05-12 06:19:53 -0500 | [diff] [blame] | 401 | /* This should match the numeric part of the final component of |
Glenn Randers-Pehrson | 6c7a09a | 2009-06-15 21:57:39 -0500 | [diff] [blame] | 402 | * PNG_LIBPNG_VER_STRING, omitting any leading zero: |
| 403 | */ |
Glenn Randers-Pehrson | d56aca7 | 2000-11-23 11:51:42 -0600 | [diff] [blame] | 404 | |
Glenn Randers-Pehrson | b23afad | 2013-07-10 19:30:59 -0500 | [diff] [blame^] | 405 | #define PNG_LIBPNG_VER_BUILD 01 |
Glenn Randers-Pehrson | d56aca7 | 2000-11-23 11:51:42 -0600 | [diff] [blame] | 406 | |
Glenn Randers-Pehrson | 4093607 | 2004-11-20 11:18:40 -0600 | [diff] [blame] | 407 | /* Release Status */ |
Glenn Randers-Pehrson | d56aca7 | 2000-11-23 11:51:42 -0600 | [diff] [blame] | 408 | #define PNG_LIBPNG_BUILD_ALPHA 1 |
| 409 | #define PNG_LIBPNG_BUILD_BETA 2 |
| 410 | #define PNG_LIBPNG_BUILD_RC 3 |
| 411 | #define PNG_LIBPNG_BUILD_STABLE 4 |
Glenn Randers-Pehrson | 4093607 | 2004-11-20 11:18:40 -0600 | [diff] [blame] | 412 | #define PNG_LIBPNG_BUILD_RELEASE_STATUS_MASK 7 |
Glenn Randers-Pehrson | beb572e | 2006-08-19 13:59:24 -0500 | [diff] [blame] | 413 | |
Glenn Randers-Pehrson | 4093607 | 2004-11-20 11:18:40 -0600 | [diff] [blame] | 414 | /* Release-Specific Flags */ |
| 415 | #define PNG_LIBPNG_BUILD_PATCH 8 /* Can be OR'ed with |
| 416 | PNG_LIBPNG_BUILD_STABLE only */ |
| 417 | #define PNG_LIBPNG_BUILD_PRIVATE 16 /* Cannot be OR'ed with |
| 418 | PNG_LIBPNG_BUILD_SPECIAL */ |
| 419 | #define PNG_LIBPNG_BUILD_SPECIAL 32 /* Cannot be OR'ed with |
| 420 | PNG_LIBPNG_BUILD_PRIVATE */ |
Glenn Randers-Pehrson | 1ef65b6 | 2000-05-12 06:19:53 -0500 | [diff] [blame] | 421 | |
Glenn Randers-Pehrson | b23afad | 2013-07-10 19:30:59 -0500 | [diff] [blame^] | 422 | #define PNG_LIBPNG_BUILD_BASE_TYPE PNG_LIBPNG_BUILD_RC |
Glenn Randers-Pehrson | 5dd2b8e | 2004-11-24 07:50:16 -0600 | [diff] [blame] | 423 | |
Glenn Randers-Pehrson | 1ef65b6 | 2000-05-12 06:19:53 -0500 | [diff] [blame] | 424 | /* Careful here. At one time, Guy wanted to use 082, but that would be octal. |
| 425 | * We must not include leading zeros. |
| 426 | * Versions 0.7 through 1.0.0 were in the range 0 to 100 here (only |
| 427 | * version 1.0.0 was mis-numbered 100 instead of 10000). From |
Glenn Randers-Pehrson | 6c7a09a | 2009-06-15 21:57:39 -0500 | [diff] [blame] | 428 | * version 1.0.1 it's xxyyzz, where x=major, y=minor, z=release |
| 429 | */ |
Glenn Randers-Pehrson | 3f677d1 | 2013-04-25 09:12:51 -0500 | [diff] [blame] | 430 | #define PNG_LIBPNG_VER 10603 /* 1.6.3 */ |
Glenn Randers-Pehrson | 1ef65b6 | 2000-05-12 06:19:53 -0500 | [diff] [blame] | 431 | |
Glenn Randers-Pehrson | 862cb20 | 2010-04-16 22:12:51 -0500 | [diff] [blame] | 432 | /* Library configuration: these options cannot be changed after |
| 433 | * the library has been built. |
| 434 | */ |
| 435 | #ifndef PNGLCONF_H |
Glenn Randers-Pehrson | 8c66786 | 2010-08-24 16:16:35 -0500 | [diff] [blame] | 436 | /* If pnglibconf.h is missing, you can |
| 437 | * copy scripts/pnglibconf.h.prebuilt to pnglibconf.h |
| 438 | */ |
Glenn Randers-Pehrson | 98b4f00 | 2010-04-16 22:30:26 -0500 | [diff] [blame] | 439 | # include "pnglibconf.h" |
Glenn Randers-Pehrson | 5dd2b8e | 2004-11-24 07:50:16 -0600 | [diff] [blame] | 440 | #endif |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 441 | |
Glenn Randers-Pehrson | 862cb20 | 2010-04-16 22:12:51 -0500 | [diff] [blame] | 442 | #ifndef PNG_VERSION_INFO_ONLY |
John Bowler | baeb6d1 | 2011-11-26 18:21:02 -0600 | [diff] [blame] | 443 | /* Machine specific configuration. */ |
Glenn Randers-Pehrson | 862cb20 | 2010-04-16 22:12:51 -0500 | [diff] [blame] | 444 | # include "pngconf.h" |
| 445 | #endif |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 446 | |
Glenn Randers-Pehrson | 5dd2b8e | 2004-11-24 07:50:16 -0600 | [diff] [blame] | 447 | /* |
Glenn Randers-Pehrson | 6c7a09a | 2009-06-15 21:57:39 -0500 | [diff] [blame] | 448 | * Added at libpng-1.2.8 |
| 449 | * |
| 450 | * Ref MSDN: Private as priority over Special |
Glenn Randers-Pehrson | 5dd2b8e | 2004-11-24 07:50:16 -0600 | [diff] [blame] | 451 | * VS_FF_PRIVATEBUILD File *was not* built using standard release |
| 452 | * procedures. If this value is given, the StringFileInfo block must |
Glenn Randers-Pehrson | beb572e | 2006-08-19 13:59:24 -0500 | [diff] [blame] | 453 | * contain a PrivateBuild string. |
Glenn Randers-Pehrson | 5dd2b8e | 2004-11-24 07:50:16 -0600 | [diff] [blame] | 454 | * |
| 455 | * VS_FF_SPECIALBUILD File *was* built by the original company using |
| 456 | * standard release procedures but is a variation of the standard |
| 457 | * file of the same version number. If this value is given, the |
Glenn Randers-Pehrson | beb572e | 2006-08-19 13:59:24 -0500 | [diff] [blame] | 458 | * StringFileInfo block must contain a SpecialBuild string. |
Glenn Randers-Pehrson | 5dd2b8e | 2004-11-24 07:50:16 -0600 | [diff] [blame] | 459 | */ |
| 460 | |
Glenn Randers-Pehrson | 98b4f00 | 2010-04-16 22:30:26 -0500 | [diff] [blame] | 461 | #ifdef PNG_USER_PRIVATEBUILD /* From pnglibconf.h */ |
Glenn Randers-Pehrson | 9c3ab68 | 2006-02-20 22:09:05 -0600 | [diff] [blame] | 462 | # define PNG_LIBPNG_BUILD_TYPE \ |
Glenn Randers-Pehrson | eae8e36 | 2010-03-12 17:36:53 -0600 | [diff] [blame] | 463 | (PNG_LIBPNG_BUILD_BASE_TYPE | PNG_LIBPNG_BUILD_PRIVATE) |
Glenn Randers-Pehrson | 5dd2b8e | 2004-11-24 07:50:16 -0600 | [diff] [blame] | 464 | #else |
Glenn Randers-Pehrson | 4e6b5e9 | 2009-09-23 10:24:53 -0500 | [diff] [blame] | 465 | # ifdef PNG_LIBPNG_SPECIALBUILD |
Glenn Randers-Pehrson | 9c3ab68 | 2006-02-20 22:09:05 -0600 | [diff] [blame] | 466 | # define PNG_LIBPNG_BUILD_TYPE \ |
Glenn Randers-Pehrson | eae8e36 | 2010-03-12 17:36:53 -0600 | [diff] [blame] | 467 | (PNG_LIBPNG_BUILD_BASE_TYPE | PNG_LIBPNG_BUILD_SPECIAL) |
Glenn Randers-Pehrson | 5dd2b8e | 2004-11-24 07:50:16 -0600 | [diff] [blame] | 468 | # else |
Glenn Randers-Pehrson | 9c3ab68 | 2006-02-20 22:09:05 -0600 | [diff] [blame] | 469 | # define PNG_LIBPNG_BUILD_TYPE (PNG_LIBPNG_BUILD_BASE_TYPE) |
Glenn Randers-Pehrson | 5dd2b8e | 2004-11-24 07:50:16 -0600 | [diff] [blame] | 470 | # endif |
| 471 | #endif |
| 472 | |
| 473 | #ifndef PNG_VERSION_INFO_ONLY |
| 474 | |
Glenn Randers-Pehrson | 4393a9a | 1999-09-17 12:27:26 -0500 | [diff] [blame] | 475 | /* Inhibit C++ name-mangling for libpng functions but not for system calls. */ |
| 476 | #ifdef __cplusplus |
| 477 | extern "C" { |
| 478 | #endif /* __cplusplus */ |
| 479 | |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 480 | /* Version information for C files, stored in png.c. This had better match |
| 481 | * the version above. |
| 482 | */ |
Glenn Randers-Pehrson | 4c8f726 | 2010-03-16 19:30:01 -0500 | [diff] [blame] | 483 | #define png_libpng_ver png_get_header_ver(NULL) |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 484 | |
Glenn Randers-Pehrson | 862cb20 | 2010-04-16 22:12:51 -0500 | [diff] [blame] | 485 | /* This file is arranged in several sections: |
| 486 | * |
| 487 | * 1. Any configuration options that can be specified by for the application |
Glenn Randers-Pehrson | 98b4f00 | 2010-04-16 22:30:26 -0500 | [diff] [blame] | 488 | * code when it is built. (Build time configuration is in pnglibconf.h) |
Glenn Randers-Pehrson | 862cb20 | 2010-04-16 22:12:51 -0500 | [diff] [blame] | 489 | * 2. Type definitions (base types are defined in pngconf.h), structure |
| 490 | * definitions. |
| 491 | * 3. Exported library functions. |
John Bowler | 7875d53 | 2011-11-07 22:33:49 -0600 | [diff] [blame] | 492 | * 4. Simplified API. |
Glenn Randers-Pehrson | 862cb20 | 2010-04-16 22:12:51 -0500 | [diff] [blame] | 493 | * |
| 494 | * The library source code has additional files (principally pngpriv.h) that |
| 495 | * allow configuration of the library. |
| 496 | */ |
| 497 | /* Section 1: run time configuration |
Glenn Randers-Pehrson | 98b4f00 | 2010-04-16 22:30:26 -0500 | [diff] [blame] | 498 | * See pnglibconf.h for build time configuration |
Glenn Randers-Pehrson | 862cb20 | 2010-04-16 22:12:51 -0500 | [diff] [blame] | 499 | * |
| 500 | * Run time configuration allows the application to choose between |
| 501 | * implementations of certain arithmetic APIs. The default is set |
Glenn Randers-Pehrson | 98b4f00 | 2010-04-16 22:30:26 -0500 | [diff] [blame] | 502 | * at build time and recorded in pnglibconf.h, but it is safe to |
Glenn Randers-Pehrson | 862cb20 | 2010-04-16 22:12:51 -0500 | [diff] [blame] | 503 | * override these (and only these) settings. Note that this won't |
| 504 | * change what the library does, only application code, and the |
| 505 | * settings can (and probably should) be made on a per-file basis |
| 506 | * by setting the #defines before including png.h |
| 507 | * |
| 508 | * Use macros to read integers from PNG data or use the exported |
| 509 | * functions? |
| 510 | * PNG_USE_READ_MACROS: use the macros (see below) Note that |
| 511 | * the macros evaluate their argument multiple times. |
| 512 | * PNG_NO_USE_READ_MACROS: call the relevant library function. |
| 513 | * |
| 514 | * Use the alternative algorithm for compositing alpha samples that |
| 515 | * does not use division? |
| 516 | * PNG_READ_COMPOSITE_NODIV_SUPPORTED: use the 'no division' |
| 517 | * algorithm. |
| 518 | * PNG_NO_READ_COMPOSITE_NODIV: use the 'division' algorithm. |
| 519 | * |
| 520 | * How to handle benign errors if PNG_ALLOW_BENIGN_ERRORS is |
| 521 | * false? |
| 522 | * PNG_ALLOW_BENIGN_ERRORS: map calls to the benign error |
| 523 | * APIs to png_warning. |
| 524 | * Otherwise the calls are mapped to png_error. |
| 525 | */ |
| 526 | |
| 527 | /* Section 2: type definitions, including structures and compile time |
| 528 | * constants. |
| 529 | * See pngconf.h for base types that vary by machine/system |
| 530 | */ |
Glenn Randers-Pehrson | 88910f5 | 2010-10-16 20:38:45 -0500 | [diff] [blame] | 531 | |
| 532 | /* This triggers a compiler error in png.c, if png.c and png.h |
| 533 | * do not agree upon the version number. |
| 534 | */ |
Glenn Randers-Pehrson | b23afad | 2013-07-10 19:30:59 -0500 | [diff] [blame^] | 535 | typedef char* png_libpng_version_1_6_3rc01; |
Glenn Randers-Pehrson | 88910f5 | 2010-10-16 20:38:45 -0500 | [diff] [blame] | 536 | |
John Bowler | 5d56786 | 2011-12-24 09:12:00 -0600 | [diff] [blame] | 537 | /* Basic control structions. Read libpng-manual.txt or libpng.3 for more info. |
| 538 | * |
| 539 | * png_struct is the cache of information used while reading or writing a single |
| 540 | * PNG file. One of these is always required, although the simplified API |
| 541 | * (below) hides the creation and destruction of it. |
| 542 | */ |
| 543 | typedef struct png_struct_def png_struct; |
| 544 | typedef const png_struct * png_const_structp; |
| 545 | typedef png_struct * png_structp; |
| 546 | typedef png_struct * * png_structpp; |
| 547 | |
| 548 | /* png_info contains information read from or to be written to a PNG file. One |
| 549 | * or more of these must exist while reading or creating a PNG file. The |
| 550 | * information is not used by libpng during read but is used to control what |
| 551 | * gets written when a PNG file is created. "png_get_" function calls read |
| 552 | * information during read and "png_set_" functions calls write information |
| 553 | * when creating a PNG. |
| 554 | * been moved into a separate header file that is not accessible to |
| 555 | * applications. Read libpng-manual.txt or libpng.3 for more info. |
| 556 | */ |
| 557 | typedef struct png_info_def png_info; |
| 558 | typedef png_info * png_infop; |
| 559 | typedef const png_info * png_const_infop; |
| 560 | typedef png_info * * png_infopp; |
| 561 | |
| 562 | /* Types with names ending 'p' are pointer types. The corresponding types with |
| 563 | * names ending 'rp' are identical pointer types except that the pointer is |
| 564 | * marked 'restrict', which means that it is the only pointer to the object |
| 565 | * passed to the function. Applications should not use the 'restrict' types; |
| 566 | * it is always valid to pass 'p' to a pointer with a function argument of the |
| 567 | * corresponding 'rp' type. Different compilers have different rules with |
| 568 | * regard to type matching in the presence of 'restrict'. For backward |
| 569 | * compatibility libpng callbacks never have 'restrict' in their parameters and, |
| 570 | * consequentially, writing portable application code is extremely difficult if |
| 571 | * an attempt is made to use 'restrict'. |
| 572 | */ |
| 573 | typedef png_struct * PNG_RESTRICT png_structrp; |
| 574 | typedef const png_struct * PNG_RESTRICT png_const_structrp; |
| 575 | typedef png_info * PNG_RESTRICT png_inforp; |
| 576 | typedef const png_info * PNG_RESTRICT png_const_inforp; |
| 577 | |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 578 | /* Three color definitions. The order of the red, green, and blue, (and the |
| 579 | * exact size) is not important, although the size of the fields need to |
| 580 | * be png_byte or png_uint_16 (as defined below). |
| 581 | */ |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 582 | typedef struct png_color_struct |
| 583 | { |
Guy Schalnat | 4ee97b0 | 1996-01-16 01:51:56 -0600 | [diff] [blame] | 584 | png_byte red; |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 585 | png_byte green; |
| 586 | png_byte blue; |
| 587 | } png_color; |
John Bowler | baeb6d1 | 2011-11-26 18:21:02 -0600 | [diff] [blame] | 588 | typedef png_color * png_colorp; |
| 589 | typedef const png_color * png_const_colorp; |
| 590 | typedef png_color * * png_colorpp; |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 591 | |
| 592 | typedef struct png_color_16_struct |
| 593 | { |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 594 | png_byte index; /* used for palette files */ |
| 595 | png_uint_16 red; /* for use in red green blue files */ |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 596 | png_uint_16 green; |
| 597 | png_uint_16 blue; |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 598 | png_uint_16 gray; /* for use in grayscale files */ |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 599 | } png_color_16; |
John Bowler | baeb6d1 | 2011-11-26 18:21:02 -0600 | [diff] [blame] | 600 | typedef png_color_16 * png_color_16p; |
| 601 | typedef const png_color_16 * png_const_color_16p; |
| 602 | typedef png_color_16 * * png_color_16pp; |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 603 | |
| 604 | typedef struct png_color_8_struct |
| 605 | { |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 606 | png_byte red; /* for use in red green blue files */ |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 607 | png_byte green; |
| 608 | png_byte blue; |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 609 | png_byte gray; /* for use in grayscale files */ |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 610 | png_byte alpha; /* for alpha channel files */ |
| 611 | } png_color_8; |
John Bowler | baeb6d1 | 2011-11-26 18:21:02 -0600 | [diff] [blame] | 612 | typedef png_color_8 * png_color_8p; |
| 613 | typedef const png_color_8 * png_const_color_8p; |
| 614 | typedef png_color_8 * * png_color_8pp; |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 615 | |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame] | 616 | /* |
| 617 | * The following two structures are used for the in-core representation |
| 618 | * of sPLT chunks. |
| 619 | */ |
Glenn Randers-Pehrson | 520a764 | 2000-03-21 05:13:06 -0600 | [diff] [blame] | 620 | typedef struct png_sPLT_entry_struct |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame] | 621 | { |
| 622 | png_uint_16 red; |
| 623 | png_uint_16 green; |
| 624 | png_uint_16 blue; |
| 625 | png_uint_16 alpha; |
| 626 | png_uint_16 frequency; |
Glenn Randers-Pehrson | 520a764 | 2000-03-21 05:13:06 -0600 | [diff] [blame] | 627 | } png_sPLT_entry; |
John Bowler | baeb6d1 | 2011-11-26 18:21:02 -0600 | [diff] [blame] | 628 | typedef png_sPLT_entry * png_sPLT_entryp; |
| 629 | typedef const png_sPLT_entry * png_const_sPLT_entryp; |
| 630 | typedef png_sPLT_entry * * png_sPLT_entrypp; |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame] | 631 | |
Glenn Randers-Pehrson | 4accabb | 2000-04-14 14:20:47 -0500 | [diff] [blame] | 632 | /* When the depth of the sPLT palette is 8 bits, the color and alpha samples |
| 633 | * occupy the LSB of their respective members, and the MSB of each member |
| 634 | * is zero-filled. The frequency member always occupies the full 16 bits. |
| 635 | */ |
| 636 | |
Glenn Randers-Pehrson | 520a764 | 2000-03-21 05:13:06 -0600 | [diff] [blame] | 637 | typedef struct png_sPLT_struct |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame] | 638 | { |
Glenn Randers-Pehrson | 4accabb | 2000-04-14 14:20:47 -0500 | [diff] [blame] | 639 | png_charp name; /* palette name */ |
| 640 | png_byte depth; /* depth of palette samples */ |
| 641 | png_sPLT_entryp entries; /* palette entries */ |
| 642 | png_int_32 nentries; /* number of palette entries */ |
Glenn Randers-Pehrson | 520a764 | 2000-03-21 05:13:06 -0600 | [diff] [blame] | 643 | } png_sPLT_t; |
John Bowler | baeb6d1 | 2011-11-26 18:21:02 -0600 | [diff] [blame] | 644 | typedef png_sPLT_t * png_sPLT_tp; |
| 645 | typedef const png_sPLT_t * png_const_sPLT_tp; |
| 646 | typedef png_sPLT_t * * png_sPLT_tpp; |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame] | 647 | |
| 648 | #ifdef PNG_TEXT_SUPPORTED |
Glenn Randers-Pehrson | c36bb79 | 2011-02-12 09:49:07 -0600 | [diff] [blame] | 649 | /* png_text holds the contents of a text/ztxt/itxt chunk in a PNG file, |
Glenn Randers-Pehrson | 61c32d9 | 2000-02-04 23:40:16 -0600 | [diff] [blame] | 650 | * and whether that contents is compressed or not. The "key" field |
Glenn Randers-Pehrson | 680da02 | 2011-11-21 17:05:41 -0600 | [diff] [blame] | 651 | * points to a regular zero-terminated C string. The "text" fields can be a |
| 652 | * regular C string, an empty string, or a NULL pointer. |
Glenn Randers-Pehrson | 140504b | 2011-06-15 08:10:13 -0500 | [diff] [blame] | 653 | * However, the structure returned by png_get_text() will always contain |
Glenn Randers-Pehrson | 680da02 | 2011-11-21 17:05:41 -0600 | [diff] [blame] | 654 | * the "text" field as a regular zero-terminated C string (possibly |
| 655 | * empty), never a NULL pointer, so it can be safely used in printf() and |
| 656 | * other string-handling functions. Note that the "itxt_length", "lang", and |
| 657 | * "lang_key" members of the structure only exist when the library is built |
| 658 | * with iTXt chunk support. Prior to libpng-1.4.0 the library was built by |
| 659 | * default without iTXt support. Also note that when iTXt *is* supported, |
| 660 | * the "lang" and "lang_key" fields contain NULL pointers when the |
| 661 | * "compression" field contains * PNG_TEXT_COMPRESSION_NONE or |
Glenn Randers-Pehrson | 12fb29f | 2011-11-22 11:53:49 -0600 | [diff] [blame] | 662 | * PNG_TEXT_COMPRESSION_zTXt. Note that the "compression value" is not the |
| 663 | * same as what appears in the PNG tEXt/zTXt/iTXt chunk's "compression flag" |
| 664 | * which is always 0 or 1, or its "compression method" which is always 0. |
Glenn Randers-Pehrson | 4accabb | 2000-04-14 14:20:47 -0500 | [diff] [blame] | 665 | */ |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 666 | typedef struct png_text_struct |
| 667 | { |
Glenn Randers-Pehrson | 4accabb | 2000-04-14 14:20:47 -0500 | [diff] [blame] | 668 | int compression; /* compression value: |
| 669 | -1: tEXt, none |
| 670 | 0: zTXt, deflate |
| 671 | 1: iTXt, none |
| 672 | 2: iTXt, deflate */ |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 673 | png_charp key; /* keyword, 1-79 character description of "text" */ |
Glenn Randers-Pehrson | 4accabb | 2000-04-14 14:20:47 -0500 | [diff] [blame] | 674 | png_charp text; /* comment, may be an empty string (ie "") |
| 675 | or a NULL pointer */ |
Glenn Randers-Pehrson | 61c32d9 | 2000-02-04 23:40:16 -0600 | [diff] [blame] | 676 | png_size_t text_length; /* length of the text string */ |
| 677 | png_size_t itxt_length; /* length of the itxt string */ |
Glenn Randers-Pehrson | 4accabb | 2000-04-14 14:20:47 -0500 | [diff] [blame] | 678 | png_charp lang; /* language code, 0-79 characters |
| 679 | or a NULL pointer */ |
Glenn Randers-Pehrson | 61c32d9 | 2000-02-04 23:40:16 -0600 | [diff] [blame] | 680 | 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] | 681 | chars or a NULL pointer */ |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 682 | } png_text; |
John Bowler | baeb6d1 | 2011-11-26 18:21:02 -0600 | [diff] [blame] | 683 | typedef png_text * png_textp; |
| 684 | typedef const png_text * png_const_textp; |
| 685 | typedef png_text * * png_textpp; |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame] | 686 | #endif |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 687 | |
| 688 | /* Supported compression types for text in PNG files (tEXt, and zTXt). |
| 689 | * The values of the PNG_TEXT_COMPRESSION_ defines should NOT be changed. */ |
| 690 | #define PNG_TEXT_COMPRESSION_NONE_WR -3 |
| 691 | #define PNG_TEXT_COMPRESSION_zTXt_WR -2 |
| 692 | #define PNG_TEXT_COMPRESSION_NONE -1 |
| 693 | #define PNG_TEXT_COMPRESSION_zTXt 0 |
Glenn Randers-Pehrson | 61c32d9 | 2000-02-04 23:40:16 -0600 | [diff] [blame] | 694 | #define PNG_ITXT_COMPRESSION_NONE 1 |
| 695 | #define PNG_ITXT_COMPRESSION_zTXt 2 |
| 696 | #define PNG_TEXT_COMPRESSION_LAST 3 /* Not a valid value */ |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 697 | |
| 698 | /* 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] | 699 | * Two conversions are provided, both from time_t and struct tm. There |
| 700 | * is no portable way to convert to either of these structures, as far |
| 701 | * 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] | 702 | * note - PNG has always been Year 2000 compliant! |
Glenn Randers-Pehrson | b6ce43d | 1998-01-01 07:13:13 -0600 | [diff] [blame] | 703 | */ |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 704 | typedef struct png_time_struct |
| 705 | { |
| 706 | png_uint_16 year; /* full year, as in, 1995 */ |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 707 | png_byte month; /* month of year, 1 - 12 */ |
| 708 | png_byte day; /* day of month, 1 - 31 */ |
| 709 | png_byte hour; /* hour of day, 0 - 23 */ |
| 710 | png_byte minute; /* minute of hour, 0 - 59 */ |
| 711 | png_byte second; /* second of minute, 0 - 60 (for leap seconds) */ |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 712 | } png_time; |
John Bowler | baeb6d1 | 2011-11-26 18:21:02 -0600 | [diff] [blame] | 713 | typedef png_time * png_timep; |
| 714 | typedef const png_time * png_const_timep; |
| 715 | typedef png_time * * png_timepp; |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 716 | |
Glenn Randers-Pehrson | 871b1d0 | 2013-03-02 14:58:22 -0600 | [diff] [blame] | 717 | #ifdef PNG_STORE_UNKNOWN_CHUNKS_SUPPORTED |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame] | 718 | /* png_unknown_chunk is a structure to hold queued chunks for which there is |
| 719 | * no specific support. The idea is that we can use this to queue |
| 720 | * up private chunks for output even though the library doesn't actually |
| 721 | * know about their semantics. |
Glenn Randers-Pehrson | 871b1d0 | 2013-03-02 14:58:22 -0600 | [diff] [blame] | 722 | * |
| 723 | * The data in the structure is set by libpng on read and used on write. |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame] | 724 | */ |
| 725 | typedef struct png_unknown_chunk_t |
| 726 | { |
Glenn Randers-Pehrson | 871b1d0 | 2013-03-02 14:58:22 -0600 | [diff] [blame] | 727 | png_byte name[5]; /* Textual chunk name with '\0' terminator */ |
| 728 | png_byte *data; /* Data, should not be modified on read! */ |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame] | 729 | png_size_t size; |
| 730 | |
Glenn Randers-Pehrson | 871b1d0 | 2013-03-02 14:58:22 -0600 | [diff] [blame] | 731 | /* On write 'location' must be set using the flag values listed below. |
| 732 | * Notice that on read it is set by libpng however the values stored have |
| 733 | * more bits set than are listed below. Always treat the value as a |
| 734 | * bitmask. On write set only one bit - setting multiple bits may cause the |
| 735 | * chunk to be written in multiple places. |
| 736 | */ |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame] | 737 | png_byte location; /* mode of operation at read time */ |
| 738 | } |
| 739 | png_unknown_chunk; |
John Bowler | 40b2603 | 2011-12-22 08:09:15 -0600 | [diff] [blame] | 740 | |
John Bowler | baeb6d1 | 2011-11-26 18:21:02 -0600 | [diff] [blame] | 741 | typedef png_unknown_chunk * png_unknown_chunkp; |
| 742 | typedef const png_unknown_chunk * png_const_unknown_chunkp; |
| 743 | typedef png_unknown_chunk * * png_unknown_chunkpp; |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame] | 744 | #endif |
| 745 | |
Glenn Randers-Pehrson | 871b1d0 | 2013-03-02 14:58:22 -0600 | [diff] [blame] | 746 | /* Flag values for the unknown chunk location byte. */ |
Glenn Randers-Pehrson | fd73d04 | 2011-06-13 13:25:21 -0500 | [diff] [blame] | 747 | #define PNG_HAVE_IHDR 0x01 |
| 748 | #define PNG_HAVE_PLTE 0x02 |
| 749 | #define PNG_AFTER_IDAT 0x08 |
Glenn Randers-Pehrson | 2d3fc1c | 2011-05-10 23:48:00 -0500 | [diff] [blame] | 750 | |
Glenn Randers-Pehrson | 4393a9a | 1999-09-17 12:27:26 -0500 | [diff] [blame] | 751 | /* Maximum positive integer used in PNG is (2^31)-1 */ |
Glenn Randers-Pehrson | 5fea36f | 2004-07-28 08:20:44 -0500 | [diff] [blame] | 752 | #define PNG_UINT_31_MAX ((png_uint_32)0x7fffffffL) |
Glenn Randers-Pehrson | 7806777 | 2004-11-02 21:49:39 -0600 | [diff] [blame] | 753 | #define PNG_UINT_32_MAX ((png_uint_32)(-1)) |
| 754 | #define PNG_SIZE_MAX ((png_size_t)(-1)) |
Glenn Randers-Pehrson | 4393a9a | 1999-09-17 12:27:26 -0500 | [diff] [blame] | 755 | |
Glenn Randers-Pehrson | 31aee0d | 2010-07-29 17:39:14 -0500 | [diff] [blame] | 756 | /* These are constants for fixed point values encoded in the |
| 757 | * PNG specification manner (x100000) |
| 758 | */ |
| 759 | #define PNG_FP_1 100000 |
| 760 | #define PNG_FP_HALF 50000 |
John Bowler | d273ad2 | 2011-05-07 21:00:28 -0500 | [diff] [blame] | 761 | #define PNG_FP_MAX ((png_fixed_point)0x7fffffffL) |
| 762 | #define PNG_FP_MIN (-PNG_FP_MAX) |
Glenn Randers-Pehrson | 31aee0d | 2010-07-29 17:39:14 -0500 | [diff] [blame] | 763 | |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 764 | /* These describe the color_type field in png_info. */ |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 765 | /* color type masks */ |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 766 | #define PNG_COLOR_MASK_PALETTE 1 |
| 767 | #define PNG_COLOR_MASK_COLOR 2 |
| 768 | #define PNG_COLOR_MASK_ALPHA 4 |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 769 | |
| 770 | /* color types. Note that not all combinations are legal */ |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 771 | #define PNG_COLOR_TYPE_GRAY 0 |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 772 | #define PNG_COLOR_TYPE_PALETTE (PNG_COLOR_MASK_COLOR | PNG_COLOR_MASK_PALETTE) |
| 773 | #define PNG_COLOR_TYPE_RGB (PNG_COLOR_MASK_COLOR) |
| 774 | #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] | 775 | #define PNG_COLOR_TYPE_GRAY_ALPHA (PNG_COLOR_MASK_ALPHA) |
Glenn Randers-Pehrson | 5e5c1e1 | 2000-11-10 12:26:19 -0600 | [diff] [blame] | 776 | /* aliases */ |
| 777 | #define PNG_COLOR_TYPE_RGBA PNG_COLOR_TYPE_RGB_ALPHA |
| 778 | #define PNG_COLOR_TYPE_GA PNG_COLOR_TYPE_GRAY_ALPHA |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 779 | |
Glenn Randers-Pehrson | 4393a9a | 1999-09-17 12:27:26 -0500 | [diff] [blame] | 780 | /* 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] | 781 | #define PNG_COMPRESSION_TYPE_BASE 0 /* Deflate method 8, 32K window */ |
| 782 | #define PNG_COMPRESSION_TYPE_DEFAULT PNG_COMPRESSION_TYPE_BASE |
| 783 | |
Glenn Randers-Pehrson | 4393a9a | 1999-09-17 12:27:26 -0500 | [diff] [blame] | 784 | /* 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] | 785 | #define PNG_FILTER_TYPE_BASE 0 /* Single row per-byte filtering */ |
Glenn Randers-Pehrson | 2ad31ae | 2000-12-15 08:54:42 -0600 | [diff] [blame] | 786 | #define PNG_INTRAPIXEL_DIFFERENCING 64 /* Used only in MNG datastreams */ |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 787 | #define PNG_FILTER_TYPE_DEFAULT PNG_FILTER_TYPE_BASE |
| 788 | |
| 789 | /* These are for the interlacing type. These values should NOT be changed. */ |
| 790 | #define PNG_INTERLACE_NONE 0 /* Non-interlaced image */ |
| 791 | #define PNG_INTERLACE_ADAM7 1 /* Adam7 interlacing */ |
| 792 | #define PNG_INTERLACE_LAST 2 /* Not a valid value */ |
| 793 | |
| 794 | /* These are for the oFFs chunk. These values should NOT be changed. */ |
| 795 | #define PNG_OFFSET_PIXEL 0 /* Offset in pixels */ |
| 796 | #define PNG_OFFSET_MICROMETER 1 /* Offset in micrometers (1/10^6 meter) */ |
| 797 | #define PNG_OFFSET_LAST 2 /* Not a valid value */ |
| 798 | |
| 799 | /* These are for the pCAL chunk. These values should NOT be changed. */ |
| 800 | #define PNG_EQUATION_LINEAR 0 /* Linear transformation */ |
| 801 | #define PNG_EQUATION_BASE_E 1 /* Exponential base e transform */ |
| 802 | #define PNG_EQUATION_ARBITRARY 2 /* Arbitrary base exponential transform */ |
| 803 | #define PNG_EQUATION_HYPERBOLIC 3 /* Hyperbolic sine transformation */ |
| 804 | #define PNG_EQUATION_LAST 4 /* Not a valid value */ |
| 805 | |
Glenn Randers-Pehrson | 61c32d9 | 2000-02-04 23:40:16 -0600 | [diff] [blame] | 806 | /* These are for the sCAL chunk. These values should NOT be changed. */ |
| 807 | #define PNG_SCALE_UNKNOWN 0 /* unknown unit (image scale) */ |
| 808 | #define PNG_SCALE_METER 1 /* meters per pixel */ |
| 809 | #define PNG_SCALE_RADIAN 2 /* radians per pixel */ |
| 810 | #define PNG_SCALE_LAST 3 /* Not a valid value */ |
| 811 | |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 812 | /* These are for the pHYs chunk. These values should NOT be changed. */ |
| 813 | #define PNG_RESOLUTION_UNKNOWN 0 /* pixels/unknown unit (aspect ratio) */ |
| 814 | #define PNG_RESOLUTION_METER 1 /* pixels/meter */ |
| 815 | #define PNG_RESOLUTION_LAST 2 /* Not a valid value */ |
| 816 | |
Glenn Randers-Pehrson | 46f61e2 | 1998-01-30 21:45:12 -0600 | [diff] [blame] | 817 | /* 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] | 818 | #define PNG_sRGB_INTENT_PERCEPTUAL 0 |
| 819 | #define PNG_sRGB_INTENT_RELATIVE 1 |
| 820 | #define PNG_sRGB_INTENT_SATURATION 2 |
| 821 | #define PNG_sRGB_INTENT_ABSOLUTE 3 |
Glenn Randers-Pehrson | 46f61e2 | 1998-01-30 21:45:12 -0600 | [diff] [blame] | 822 | #define PNG_sRGB_INTENT_LAST 4 /* Not a valid value */ |
Glenn Randers-Pehrson | 5c6aeb2 | 1998-12-29 11:47:59 -0600 | [diff] [blame] | 823 | |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame] | 824 | /* This is for text chunks */ |
| 825 | #define PNG_KEYWORD_MAX_LENGTH 79 |
Glenn Randers-Pehrson | 46f61e2 | 1998-01-30 21:45:12 -0600 | [diff] [blame] | 826 | |
Glenn Randers-Pehrson | 76e5fd6 | 2000-12-28 07:50:05 -0600 | [diff] [blame] | 827 | /* Maximum number of entries in PLTE/sPLT/tRNS arrays */ |
Glenn Randers-Pehrson | d1e8c86 | 2002-06-20 06:54:34 -0500 | [diff] [blame] | 828 | #define PNG_MAX_PALETTE_LENGTH 256 |
Glenn Randers-Pehrson | 46f61e2 | 1998-01-30 21:45:12 -0600 | [diff] [blame] | 829 | |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 830 | /* These determine if an ancillary chunk's data has been successfully read |
| 831 | * from the PNG header, or if the application has filled in the corresponding |
| 832 | * data in the info_struct to be written into the output file. The values |
| 833 | * of the PNG_INFO_<chunk> defines should NOT be changed. |
| 834 | */ |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 835 | #define PNG_INFO_gAMA 0x0001 |
| 836 | #define PNG_INFO_sBIT 0x0002 |
| 837 | #define PNG_INFO_cHRM 0x0004 |
| 838 | #define PNG_INFO_PLTE 0x0008 |
| 839 | #define PNG_INFO_tRNS 0x0010 |
| 840 | #define PNG_INFO_bKGD 0x0020 |
| 841 | #define PNG_INFO_hIST 0x0040 |
| 842 | #define PNG_INFO_pHYs 0x0080 |
| 843 | #define PNG_INFO_oFFs 0x0100 |
| 844 | #define PNG_INFO_tIME 0x0200 |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 845 | #define PNG_INFO_pCAL 0x0400 |
Glenn Randers-Pehrson | b6ce43d | 1998-01-01 07:13:13 -0600 | [diff] [blame] | 846 | #define PNG_INFO_sRGB 0x0800 /* GR-P, 0.96a */ |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame] | 847 | #define PNG_INFO_iCCP 0x1000 /* ESR, 1.0.6 */ |
| 848 | #define PNG_INFO_sPLT 0x2000 /* ESR, 1.0.6 */ |
| 849 | #define PNG_INFO_sCAL 0x4000 /* ESR, 1.0.6 */ |
John Bowler | f3f7e14 | 2011-09-09 07:32:37 -0500 | [diff] [blame] | 850 | #define PNG_INFO_IDAT 0x8000 /* ESR, 1.0.6 */ |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 851 | |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 852 | /* This is used for the transformation routines, as some of them |
| 853 | * change these values for the row. It also should enable using |
| 854 | * the routines for other purposes. |
| 855 | */ |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 856 | typedef struct png_row_info_struct |
| 857 | { |
Glenn Randers-Pehrson | 9f044c1 | 2010-12-07 14:59:43 -0600 | [diff] [blame] | 858 | png_uint_32 width; /* width of row */ |
| 859 | png_size_t rowbytes; /* number of bytes in row */ |
| 860 | png_byte color_type; /* color type of row */ |
| 861 | png_byte bit_depth; /* bit depth of row */ |
| 862 | png_byte channels; /* number of channels (1, 2, 3, or 4) */ |
Guy Schalnat | 4ee97b0 | 1996-01-16 01:51:56 -0600 | [diff] [blame] | 863 | png_byte pixel_depth; /* bits per pixel (depth * channels) */ |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 864 | } png_row_info; |
| 865 | |
John Bowler | baeb6d1 | 2011-11-26 18:21:02 -0600 | [diff] [blame] | 866 | typedef png_row_info * png_row_infop; |
| 867 | typedef png_row_info * * png_row_infopp; |
Guy Schalnat | 0f71645 | 1995-11-28 11:22:13 -0600 | [diff] [blame] | 868 | |
Glenn Randers-Pehrson | 8686fff | 1998-05-21 09:27:50 -0500 | [diff] [blame] | 869 | /* These are the function types for the I/O functions and for the functions |
| 870 | * that allow the user to override the default I/O functions with his or her |
| 871 | * own. The png_error_ptr type should match that of user-supplied warning |
| 872 | * and error functions, while the png_rw_ptr type should match that of the |
Glenn Randers-Pehrson | e600c51 | 2010-08-18 07:25:46 -0500 | [diff] [blame] | 873 | * user read/write data functions. Note that the 'write' function must not |
Glenn Randers-Pehrson | ea2f7e0 | 2010-08-18 08:14:54 -0500 | [diff] [blame] | 874 | * modify the buffer it is passed. The 'read' function, on the other hand, is |
Glenn Randers-Pehrson | e600c51 | 2010-08-18 07:25:46 -0500 | [diff] [blame] | 875 | * expected to return the read data in the buffer. |
Guy Schalnat | 0f71645 | 1995-11-28 11:22:13 -0600 | [diff] [blame] | 876 | */ |
John Bowler | 9c69360 | 2011-02-12 08:58:21 -0600 | [diff] [blame] | 877 | typedef PNG_CALLBACK(void, *png_error_ptr, (png_structp, png_const_charp)); |
| 878 | typedef PNG_CALLBACK(void, *png_rw_ptr, (png_structp, png_bytep, png_size_t)); |
| 879 | typedef PNG_CALLBACK(void, *png_flush_ptr, (png_structp)); |
| 880 | typedef PNG_CALLBACK(void, *png_read_status_ptr, (png_structp, png_uint_32, |
| 881 | int)); |
| 882 | typedef PNG_CALLBACK(void, *png_write_status_ptr, (png_structp, png_uint_32, |
| 883 | int)); |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame] | 884 | |
Guy Schalnat | 69b1448 | 1996-01-10 02:56:49 -0600 | [diff] [blame] | 885 | #ifdef PNG_PROGRESSIVE_READ_SUPPORTED |
John Bowler | 9c69360 | 2011-02-12 08:58:21 -0600 | [diff] [blame] | 886 | typedef PNG_CALLBACK(void, *png_progressive_info_ptr, (png_structp, png_infop)); |
| 887 | typedef PNG_CALLBACK(void, *png_progressive_end_ptr, (png_structp, png_infop)); |
John Bowler | 9616ad9 | 2011-02-16 06:13:46 -0600 | [diff] [blame] | 888 | |
| 889 | /* The following callback receives png_uint_32 row_number, int pass for the |
| 890 | * png_bytep data of the row. When transforming an interlaced image the |
| 891 | * row number is the row number within the sub-image of the interlace pass, so |
| 892 | * the value will increase to the height of the sub-image (not the full image) |
| 893 | * then reset to 0 for the next pass. |
| 894 | * |
| 895 | * Use PNG_ROW_FROM_PASS_ROW(row, pass) and PNG_COL_FROM_PASS_COL(col, pass) to |
| 896 | * find the output pixel (x,y) given an interlaced sub-image pixel |
| 897 | * (row,col,pass). (See below for these macros.) |
| 898 | */ |
John Bowler | 9c69360 | 2011-02-12 08:58:21 -0600 | [diff] [blame] | 899 | typedef PNG_CALLBACK(void, *png_progressive_row_ptr, (png_structp, png_bytep, |
Glenn Randers-Pehrson | c36bb79 | 2011-02-12 09:49:07 -0600 | [diff] [blame] | 900 | png_uint_32, int)); |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame] | 901 | #endif |
Guy Schalnat | 6d76471 | 1995-12-19 03:22:19 -0600 | [diff] [blame] | 902 | |
Glenn Randers-Pehrson | 08a3343 | 1998-03-07 06:06:55 -0600 | [diff] [blame] | 903 | #if defined(PNG_READ_USER_TRANSFORM_SUPPORTED) || \ |
Glenn Randers-Pehrson | 33188ac | 2009-06-16 14:12:35 -0500 | [diff] [blame] | 904 | defined(PNG_WRITE_USER_TRANSFORM_SUPPORTED) |
John Bowler | 9c69360 | 2011-02-12 08:58:21 -0600 | [diff] [blame] | 905 | typedef PNG_CALLBACK(void, *png_user_transform_ptr, (png_structp, png_row_infop, |
Glenn Randers-Pehrson | c36bb79 | 2011-02-12 09:49:07 -0600 | [diff] [blame] | 906 | png_bytep)); |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame] | 907 | #endif |
Glenn Randers-Pehrson | 08a3343 | 1998-03-07 06:06:55 -0600 | [diff] [blame] | 908 | |
Glenn Randers-Pehrson | 4e6b5e9 | 2009-09-23 10:24:53 -0500 | [diff] [blame] | 909 | #ifdef PNG_USER_CHUNKS_SUPPORTED |
John Bowler | 9c69360 | 2011-02-12 08:58:21 -0600 | [diff] [blame] | 910 | typedef PNG_CALLBACK(int, *png_user_chunk_ptr, (png_structp, |
Glenn Randers-Pehrson | c36bb79 | 2011-02-12 09:49:07 -0600 | [diff] [blame] | 911 | png_unknown_chunkp)); |
Glenn Randers-Pehrson | 61c32d9 | 2000-02-04 23:40:16 -0600 | [diff] [blame] | 912 | #endif |
Glenn Randers-Pehrson | 4e6b5e9 | 2009-09-23 10:24:53 -0500 | [diff] [blame] | 913 | #ifdef PNG_UNKNOWN_CHUNKS_SUPPORTED |
Glenn Randers-Pehrson | 871b1d0 | 2013-03-02 14:58:22 -0600 | [diff] [blame] | 914 | /* not used anywhere */ |
| 915 | /* typedef PNG_CALLBACK(void, *png_unknown_chunk_ptr, (png_structp)); */ |
Glenn Randers-Pehrson | 61c32d9 | 2000-02-04 23:40:16 -0600 | [diff] [blame] | 916 | #endif |
Glenn Randers-Pehrson | 9f044c1 | 2010-12-07 14:59:43 -0600 | [diff] [blame] | 917 | |
Glenn Randers-Pehrson | f4ea224 | 2009-11-20 21:38:24 -0600 | [diff] [blame] | 918 | #ifdef PNG_SETJMP_SUPPORTED |
John Bowler | b302c47 | 2011-04-15 06:37:34 -0500 | [diff] [blame] | 919 | /* This must match the function definition in <setjmp.h>, and the application |
| 920 | * must include this before png.h to obtain the definition of jmp_buf. The |
| 921 | * function is required to be PNG_NORETURN, but this is not checked. If the |
| 922 | * function does return the application will crash via an abort() or similar |
| 923 | * system level call. |
Glenn Randers-Pehrson | 31aee0d | 2010-07-29 17:39:14 -0500 | [diff] [blame] | 924 | * |
John Bowler | b302c47 | 2011-04-15 06:37:34 -0500 | [diff] [blame] | 925 | * If you get a warning here while building the library you may need to make |
Glenn Randers-Pehrson | 31aee0d | 2010-07-29 17:39:14 -0500 | [diff] [blame] | 926 | * changes to ensure that pnglibconf.h records the calling convention used by |
| 927 | * your compiler. This may be very difficult - try using a different compiler |
| 928 | * to build the library! |
Glenn Randers-Pehrson | f4ea224 | 2009-11-20 21:38:24 -0600 | [diff] [blame] | 929 | */ |
John Bowler | b302c47 | 2011-04-15 06:37:34 -0500 | [diff] [blame] | 930 | PNG_FUNCTION(void, (PNGCAPI *png_longjmp_ptr), PNGARG((jmp_buf, int)), typedef); |
Glenn Randers-Pehrson | f4ea224 | 2009-11-20 21:38:24 -0600 | [diff] [blame] | 931 | #endif |
Glenn Randers-Pehrson | 61c32d9 | 2000-02-04 23:40:16 -0600 | [diff] [blame] | 932 | |
| 933 | /* Transform masks for the high-level interface */ |
Glenn Randers-Pehrson | a77ef62 | 2000-02-18 13:48:52 -0600 | [diff] [blame] | 934 | #define PNG_TRANSFORM_IDENTITY 0x0000 /* read and write */ |
| 935 | #define PNG_TRANSFORM_STRIP_16 0x0001 /* read only */ |
Glenn Randers-Pehrson | 61c32d9 | 2000-02-04 23:40:16 -0600 | [diff] [blame] | 936 | #define PNG_TRANSFORM_STRIP_ALPHA 0x0002 /* read only */ |
| 937 | #define PNG_TRANSFORM_PACKING 0x0004 /* read and write */ |
Glenn Randers-Pehrson | a77ef62 | 2000-02-18 13:48:52 -0600 | [diff] [blame] | 938 | #define PNG_TRANSFORM_PACKSWAP 0x0008 /* read and write */ |
| 939 | #define PNG_TRANSFORM_EXPAND 0x0010 /* read only */ |
Glenn Randers-Pehrson | 61c32d9 | 2000-02-04 23:40:16 -0600 | [diff] [blame] | 940 | #define PNG_TRANSFORM_INVERT_MONO 0x0020 /* read and write */ |
Glenn Randers-Pehrson | a77ef62 | 2000-02-18 13:48:52 -0600 | [diff] [blame] | 941 | #define PNG_TRANSFORM_SHIFT 0x0040 /* read and write */ |
| 942 | #define PNG_TRANSFORM_BGR 0x0080 /* read and write */ |
| 943 | #define PNG_TRANSFORM_SWAP_ALPHA 0x0100 /* read and write */ |
Glenn Randers-Pehrson | 61c32d9 | 2000-02-04 23:40:16 -0600 | [diff] [blame] | 944 | #define PNG_TRANSFORM_SWAP_ENDIAN 0x0200 /* read and write */ |
Glenn Randers-Pehrson | db66d44 | 2000-06-23 21:38:16 -0500 | [diff] [blame] | 945 | #define PNG_TRANSFORM_INVERT_ALPHA 0x0400 /* read and write */ |
Glenn Randers-Pehrson | 99708d5 | 2009-06-29 17:30:00 -0500 | [diff] [blame] | 946 | #define PNG_TRANSFORM_STRIP_FILLER 0x0800 /* write only */ |
Glenn Randers-Pehrson | 1eb14e9 | 2008-12-10 07:14:45 -0600 | [diff] [blame] | 947 | /* Added to libpng-1.2.34 */ |
Glenn Randers-Pehrson | 0ffb71a | 2009-02-28 06:08:20 -0600 | [diff] [blame] | 948 | #define PNG_TRANSFORM_STRIP_FILLER_BEFORE PNG_TRANSFORM_STRIP_FILLER |
Glenn Randers-Pehrson | 99708d5 | 2009-06-29 17:30:00 -0500 | [diff] [blame] | 949 | #define PNG_TRANSFORM_STRIP_FILLER_AFTER 0x1000 /* write only */ |
| 950 | /* Added to libpng-1.4.0 */ |
| 951 | #define PNG_TRANSFORM_GRAY_TO_RGB 0x2000 /* read only */ |
Glenn Randers-Pehrson | ef217b7 | 2011-06-15 12:58:27 -0500 | [diff] [blame] | 952 | /* Added to libpng-1.5.4 */ |
John Bowler | a9b3419 | 2011-05-08 19:46:51 -0500 | [diff] [blame] | 953 | #define PNG_TRANSFORM_EXPAND_16 0x4000 /* read only */ |
Glenn Randers-Pehrson | ab63dd0 | 2011-06-17 20:04:17 -0500 | [diff] [blame] | 954 | #define PNG_TRANSFORM_SCALE_16 0x8000 /* read only */ |
Glenn Randers-Pehrson | 61c32d9 | 2000-02-04 23:40:16 -0600 | [diff] [blame] | 955 | |
Glenn Randers-Pehrson | 5e5c1e1 | 2000-11-10 12:26:19 -0600 | [diff] [blame] | 956 | /* Flags for MNG supported features */ |
Glenn Randers-Pehrson | d56aca7 | 2000-11-23 11:51:42 -0600 | [diff] [blame] | 957 | #define PNG_FLAG_MNG_EMPTY_PLTE 0x01 |
Glenn Randers-Pehrson | d56aca7 | 2000-11-23 11:51:42 -0600 | [diff] [blame] | 958 | #define PNG_FLAG_MNG_FILTER_64 0x04 |
Glenn Randers-Pehrson | 408b421 | 2000-12-18 09:33:57 -0600 | [diff] [blame] | 959 | #define PNG_ALL_MNG_FEATURES 0x05 |
Glenn Randers-Pehrson | 5e5c1e1 | 2000-11-10 12:26:19 -0600 | [diff] [blame] | 960 | |
Glenn Randers-Pehrson | c36bb79 | 2011-02-12 09:49:07 -0600 | [diff] [blame] | 961 | /* NOTE: prior to 1.5 these functions had no 'API' style declaration, |
Glenn Randers-Pehrson | eae8e36 | 2010-03-12 17:36:53 -0600 | [diff] [blame] | 962 | * this allowed the zlib default functions to be used on Windows |
| 963 | * platforms. In 1.5 the zlib default malloc (which just calls malloc and |
| 964 | * ignores the first argument) should be completely compatible with the |
| 965 | * following. |
| 966 | */ |
Glenn Randers-Pehrson | c36bb79 | 2011-02-12 09:49:07 -0600 | [diff] [blame] | 967 | typedef PNG_CALLBACK(png_voidp, *png_malloc_ptr, (png_structp, |
John Bowler | 9c69360 | 2011-02-12 08:58:21 -0600 | [diff] [blame] | 968 | png_alloc_size_t)); |
| 969 | typedef PNG_CALLBACK(void, *png_free_ptr, (png_structp, png_voidp)); |
Glenn Randers-Pehrson | f7d1a17 | 1998-06-06 15:31:35 -0500 | [diff] [blame] | 970 | |
Glenn Randers-Pehrson | 862cb20 | 2010-04-16 22:12:51 -0500 | [diff] [blame] | 971 | /* Section 3: exported functions |
| 972 | * Here are the function definitions most commonly used. This is not |
Glenn Randers-Pehrson | f3abb2c | 2010-10-17 12:51:53 -0500 | [diff] [blame] | 973 | * the place to find out how to use libpng. See libpng-manual.txt for the |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 974 | * full explanation, see example.c for the summary. This just provides |
Glenn Randers-Pehrson | 61c32d9 | 2000-02-04 23:40:16 -0600 | [diff] [blame] | 975 | * a simple one line description of the use of each function. |
Glenn Randers-Pehrson | a451725 | 2010-12-06 08:54:55 -0600 | [diff] [blame] | 976 | * |
Glenn Randers-Pehrson | 23d3970 | 2010-12-06 18:28:02 -0600 | [diff] [blame] | 977 | * The PNG_EXPORT() and PNG_EXPORTA() macros used below are defined in |
| 978 | * pngconf.h and in the *.dfn files in the scripts directory. |
Glenn Randers-Pehrson | a451725 | 2010-12-06 08:54:55 -0600 | [diff] [blame] | 979 | * |
Glenn Randers-Pehrson | 23d3970 | 2010-12-06 18:28:02 -0600 | [diff] [blame] | 980 | * PNG_EXPORT(ordinal, type, name, (args)); |
Glenn Randers-Pehrson | 27df3a4 | 2010-12-06 12:38:42 -0600 | [diff] [blame] | 981 | * |
| 982 | * ordinal: ordinal that is used while building |
| 983 | * *.def files. The ordinal value is only |
| 984 | * relevant when preprocessing png.h with |
| 985 | * the *.dfn files for building symbol table |
Glenn Randers-Pehrson | 23d3970 | 2010-12-06 18:28:02 -0600 | [diff] [blame] | 986 | * entries, and are removed by pngconf.h. |
Glenn Randers-Pehrson | 27df3a4 | 2010-12-06 12:38:42 -0600 | [diff] [blame] | 987 | * type: return type of the function |
| 988 | * name: function name |
| 989 | * args: function arguments, with types |
| 990 | * |
Glenn Randers-Pehrson | 23d3970 | 2010-12-06 18:28:02 -0600 | [diff] [blame] | 991 | * When we wish to append attributes to a function prototype we use |
| 992 | * the PNG_EXPORTA() macro instead. |
| 993 | * |
Glenn Randers-Pehrson | 27df3a4 | 2010-12-06 12:38:42 -0600 | [diff] [blame] | 994 | * PNG_EXPORTA(ordinal, type, name, (args), attributes); |
| 995 | * |
Glenn Randers-Pehrson | 23d3970 | 2010-12-06 18:28:02 -0600 | [diff] [blame] | 996 | * ordinal, type, name, and args: same as in PNG_EXPORT(). |
Glenn Randers-Pehrson | 27df3a4 | 2010-12-06 12:38:42 -0600 | [diff] [blame] | 997 | * attributes: function attributes |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 998 | */ |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 999 | |
Glenn Randers-Pehrson | 1ef65b6 | 2000-05-12 06:19:53 -0500 | [diff] [blame] | 1000 | /* Returns the version number of the library */ |
Glenn Randers-Pehrson | 23d3970 | 2010-12-06 18:28:02 -0600 | [diff] [blame] | 1001 | PNG_EXPORT(1, png_uint_32, png_access_version_number, (void)); |
Glenn Randers-Pehrson | 1ef65b6 | 2000-05-12 06:19:53 -0500 | [diff] [blame] | 1002 | |
Andreas Dilger | 02ad0ef | 1997-01-17 01:34:35 -0600 | [diff] [blame] | 1003 | /* Tell lib we have already handled the first <num_bytes> magic bytes. |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 1004 | * Handling more than 8 bytes from the beginning of the file is an error. |
| 1005 | */ |
John Bowler | 5d56786 | 2011-12-24 09:12:00 -0600 | [diff] [blame] | 1006 | PNG_EXPORT(2, void, png_set_sig_bytes, (png_structrp png_ptr, int num_bytes)); |
Andreas Dilger | 02ad0ef | 1997-01-17 01:34:35 -0600 | [diff] [blame] | 1007 | |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 1008 | /* Check sig[start] through sig[start + num_to_check - 1] to see if it's a |
| 1009 | * PNG file. Returns zero if the supplied bytes match the 8-byte PNG |
| 1010 | * signature, and non-zero otherwise. Having num_to_check == 0 or |
| 1011 | * start > 7 will always fail (ie return non-zero). |
| 1012 | */ |
Glenn Randers-Pehrson | c36bb79 | 2011-02-12 09:49:07 -0600 | [diff] [blame] | 1013 | PNG_EXPORT(3, int, png_sig_cmp, (png_const_bytep sig, png_size_t start, |
Glenn Randers-Pehrson | 27df3a4 | 2010-12-06 12:38:42 -0600 | [diff] [blame] | 1014 | png_size_t num_to_check)); |
Andreas Dilger | 02ad0ef | 1997-01-17 01:34:35 -0600 | [diff] [blame] | 1015 | |
Glenn Randers-Pehrson | 3e42a99 | 2010-03-31 22:16:07 -0500 | [diff] [blame] | 1016 | /* Simple signature checking function. This is the same as calling |
| 1017 | * png_check_sig(sig, n) := !png_sig_cmp(sig, 0, n). |
| 1018 | */ |
Glenn Randers-Pehrson | 23d3970 | 2010-12-06 18:28:02 -0600 | [diff] [blame] | 1019 | #define png_check_sig(sig, n) !png_sig_cmp((sig), 0, (n)) |
Glenn Randers-Pehrson | 3e42a99 | 2010-03-31 22:16:07 -0500 | [diff] [blame] | 1020 | |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 1021 | /* Allocate and initialize png_ptr struct for reading, and any other memory. */ |
Glenn Randers-Pehrson | 23d3970 | 2010-12-06 18:28:02 -0600 | [diff] [blame] | 1022 | PNG_EXPORTA(4, png_structp, png_create_read_struct, |
| 1023 | (png_const_charp user_png_ver, png_voidp error_ptr, |
Glenn Randers-Pehrson | c36bb79 | 2011-02-12 09:49:07 -0600 | [diff] [blame] | 1024 | png_error_ptr error_fn, png_error_ptr warn_fn), |
Glenn Randers-Pehrson | 27df3a4 | 2010-12-06 12:38:42 -0600 | [diff] [blame] | 1025 | PNG_ALLOCATED); |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 1026 | |
Glenn Randers-Pehrson | f7d1a17 | 1998-06-06 15:31:35 -0500 | [diff] [blame] | 1027 | /* Allocate and initialize png_ptr struct for writing, and any other memory */ |
Glenn Randers-Pehrson | 23d3970 | 2010-12-06 18:28:02 -0600 | [diff] [blame] | 1028 | PNG_EXPORTA(5, png_structp, png_create_write_struct, |
| 1029 | (png_const_charp user_png_ver, png_voidp error_ptr, png_error_ptr error_fn, |
Glenn Randers-Pehrson | c36bb79 | 2011-02-12 09:49:07 -0600 | [diff] [blame] | 1030 | png_error_ptr warn_fn), |
Glenn Randers-Pehrson | 27df3a4 | 2010-12-06 12:38:42 -0600 | [diff] [blame] | 1031 | PNG_ALLOCATED); |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 1032 | |
Glenn Randers-Pehrson | 23d3970 | 2010-12-06 18:28:02 -0600 | [diff] [blame] | 1033 | PNG_EXPORT(6, png_size_t, png_get_compression_buffer_size, |
John Bowler | 5d56786 | 2011-12-24 09:12:00 -0600 | [diff] [blame] | 1034 | (png_const_structrp png_ptr)); |
Glenn Randers-Pehrson | 228bd39 | 2000-04-23 23:14:02 -0500 | [diff] [blame] | 1035 | |
John Bowler | 5d56786 | 2011-12-24 09:12:00 -0600 | [diff] [blame] | 1036 | PNG_EXPORT(7, void, png_set_compression_buffer_size, (png_structrp png_ptr, |
Glenn Randers-Pehrson | 27df3a4 | 2010-12-06 12:38:42 -0600 | [diff] [blame] | 1037 | png_size_t size)); |
Glenn Randers-Pehrson | 228bd39 | 2000-04-23 23:14:02 -0500 | [diff] [blame] | 1038 | |
Glenn Randers-Pehrson | f4ea224 | 2009-11-20 21:38:24 -0600 | [diff] [blame] | 1039 | /* Moved from pngconf.h in 1.4.0 and modified to ensure setjmp/longjmp |
| 1040 | * match up. |
| 1041 | */ |
| 1042 | #ifdef PNG_SETJMP_SUPPORTED |
| 1043 | /* This function returns the jmp_buf built in to *png_ptr. It must be |
| 1044 | * supplied with an appropriate 'longjmp' function to use on that jmp_buf |
| 1045 | * unless the default error function is overridden in which case NULL is |
| 1046 | * acceptable. The size of the jmp_buf is checked against the actual size |
| 1047 | * allocated by the library - the call will return NULL on a mismatch |
| 1048 | * indicating an ABI mismatch. |
| 1049 | */ |
John Bowler | 5d56786 | 2011-12-24 09:12:00 -0600 | [diff] [blame] | 1050 | PNG_EXPORT(8, jmp_buf*, png_set_longjmp_fn, (png_structrp png_ptr, |
Glenn Randers-Pehrson | 27df3a4 | 2010-12-06 12:38:42 -0600 | [diff] [blame] | 1051 | png_longjmp_ptr longjmp_fn, size_t jmp_buf_size)); |
Glenn Randers-Pehrson | f4ea224 | 2009-11-20 21:38:24 -0600 | [diff] [blame] | 1052 | # define png_jmpbuf(png_ptr) \ |
Glenn Randers-Pehrson | 871b1d0 | 2013-03-02 14:58:22 -0600 | [diff] [blame] | 1053 | (*png_set_longjmp_fn((png_ptr), longjmp, (sizeof (jmp_buf)))) |
Glenn Randers-Pehrson | f4ea224 | 2009-11-20 21:38:24 -0600 | [diff] [blame] | 1054 | #else |
| 1055 | # define png_jmpbuf(png_ptr) \ |
Glenn Randers-Pehrson | e8b1aa0 | 2010-03-06 11:39:29 -0600 | [diff] [blame] | 1056 | (LIBPNG_WAS_COMPILED_WITH__PNG_NO_SETJMP) |
Glenn Randers-Pehrson | f4ea224 | 2009-11-20 21:38:24 -0600 | [diff] [blame] | 1057 | #endif |
Glenn Randers-Pehrson | f98726a | 2010-02-19 09:54:53 -0600 | [diff] [blame] | 1058 | /* This function should be used by libpng applications in place of |
| 1059 | * longjmp(png_ptr->jmpbuf, val). If longjmp_fn() has been set, it |
| 1060 | * will use it; otherwise it will call PNG_ABORT(). This function was |
| 1061 | * added in libpng-1.5.0. |
| 1062 | */ |
John Bowler | 5d56786 | 2011-12-24 09:12:00 -0600 | [diff] [blame] | 1063 | PNG_EXPORTA(9, void, png_longjmp, (png_const_structrp png_ptr, int val), |
Glenn Randers-Pehrson | 23d3970 | 2010-12-06 18:28:02 -0600 | [diff] [blame] | 1064 | PNG_NORETURN); |
Glenn Randers-Pehrson | f4ea224 | 2009-11-20 21:38:24 -0600 | [diff] [blame] | 1065 | |
Glenn Randers-Pehrson | 2b8bef1 | 2010-04-29 11:50:24 -0500 | [diff] [blame] | 1066 | #ifdef PNG_READ_SUPPORTED |
Glenn Randers-Pehrson | 228bd39 | 2000-04-23 23:14:02 -0500 | [diff] [blame] | 1067 | /* Reset the compression stream */ |
Glenn Randers-Pehrson | 871b1d0 | 2013-03-02 14:58:22 -0600 | [diff] [blame] | 1068 | PNG_EXPORTA(10, int, png_reset_zstream, (png_structrp png_ptr), PNG_DEPRECATED); |
Glenn Randers-Pehrson | 2b8bef1 | 2010-04-29 11:50:24 -0500 | [diff] [blame] | 1069 | #endif |
Glenn Randers-Pehrson | 228bd39 | 2000-04-23 23:14:02 -0500 | [diff] [blame] | 1070 | |
Glenn Randers-Pehrson | 8b6a889 | 2001-05-18 04:54:50 -0500 | [diff] [blame] | 1071 | /* 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] | 1072 | #ifdef PNG_USER_MEM_SUPPORTED |
Glenn Randers-Pehrson | 23d3970 | 2010-12-06 18:28:02 -0600 | [diff] [blame] | 1073 | PNG_EXPORTA(11, png_structp, png_create_read_struct_2, |
| 1074 | (png_const_charp user_png_ver, png_voidp error_ptr, png_error_ptr error_fn, |
Glenn Randers-Pehrson | c36bb79 | 2011-02-12 09:49:07 -0600 | [diff] [blame] | 1075 | png_error_ptr warn_fn, |
| 1076 | png_voidp mem_ptr, png_malloc_ptr malloc_fn, png_free_ptr free_fn), |
Glenn Randers-Pehrson | 23d3970 | 2010-12-06 18:28:02 -0600 | [diff] [blame] | 1077 | PNG_ALLOCATED); |
| 1078 | PNG_EXPORTA(12, png_structp, png_create_write_struct_2, |
| 1079 | (png_const_charp user_png_ver, png_voidp error_ptr, png_error_ptr error_fn, |
Glenn Randers-Pehrson | c36bb79 | 2011-02-12 09:49:07 -0600 | [diff] [blame] | 1080 | png_error_ptr warn_fn, |
| 1081 | png_voidp mem_ptr, png_malloc_ptr malloc_fn, png_free_ptr free_fn), |
Glenn Randers-Pehrson | 23d3970 | 2010-12-06 18:28:02 -0600 | [diff] [blame] | 1082 | PNG_ALLOCATED); |
Glenn Randers-Pehrson | f7d1a17 | 1998-06-06 15:31:35 -0500 | [diff] [blame] | 1083 | #endif |
| 1084 | |
Glenn Randers-Pehrson | 6bc53be | 2006-06-16 07:52:03 -0500 | [diff] [blame] | 1085 | /* Write the PNG file signature. */ |
John Bowler | 5d56786 | 2011-12-24 09:12:00 -0600 | [diff] [blame] | 1086 | PNG_EXPORT(13, void, png_write_sig, (png_structrp png_ptr)); |
Glenn Randers-Pehrson | 6bc53be | 2006-06-16 07:52:03 -0500 | [diff] [blame] | 1087 | |
Glenn Randers-Pehrson | cbe52d8 | 1998-02-28 07:00:24 -0600 | [diff] [blame] | 1088 | /* Write a PNG chunk - size, type, (optional) data, CRC. */ |
John Bowler | 5d56786 | 2011-12-24 09:12:00 -0600 | [diff] [blame] | 1089 | PNG_EXPORT(14, void, png_write_chunk, (png_structrp png_ptr, png_const_bytep |
Glenn Randers-Pehrson | 23d3970 | 2010-12-06 18:28:02 -0600 | [diff] [blame] | 1090 | chunk_name, png_const_bytep data, png_size_t length)); |
Glenn Randers-Pehrson | cbe52d8 | 1998-02-28 07:00:24 -0600 | [diff] [blame] | 1091 | |
| 1092 | /* Write the start of a PNG chunk - length and chunk name. */ |
John Bowler | 5d56786 | 2011-12-24 09:12:00 -0600 | [diff] [blame] | 1093 | PNG_EXPORT(15, void, png_write_chunk_start, (png_structrp png_ptr, |
Glenn Randers-Pehrson | 23d3970 | 2010-12-06 18:28:02 -0600 | [diff] [blame] | 1094 | png_const_bytep chunk_name, png_uint_32 length)); |
Glenn Randers-Pehrson | cbe52d8 | 1998-02-28 07:00:24 -0600 | [diff] [blame] | 1095 | |
| 1096 | /* Write the data of a PNG chunk started with png_write_chunk_start(). */ |
John Bowler | 5d56786 | 2011-12-24 09:12:00 -0600 | [diff] [blame] | 1097 | PNG_EXPORT(16, void, png_write_chunk_data, (png_structrp png_ptr, |
Glenn Randers-Pehrson | 23d3970 | 2010-12-06 18:28:02 -0600 | [diff] [blame] | 1098 | png_const_bytep data, png_size_t length)); |
Glenn Randers-Pehrson | cbe52d8 | 1998-02-28 07:00:24 -0600 | [diff] [blame] | 1099 | |
| 1100 | /* Finish a chunk started with png_write_chunk_start() (includes CRC). */ |
John Bowler | 5d56786 | 2011-12-24 09:12:00 -0600 | [diff] [blame] | 1101 | PNG_EXPORT(17, void, png_write_chunk_end, (png_structrp png_ptr)); |
Glenn Randers-Pehrson | cbe52d8 | 1998-02-28 07:00:24 -0600 | [diff] [blame] | 1102 | |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 1103 | /* Allocate and initialize the info structure */ |
John Bowler | 5d56786 | 2011-12-24 09:12:00 -0600 | [diff] [blame] | 1104 | PNG_EXPORTA(18, png_infop, png_create_info_struct, (png_const_structrp png_ptr), |
Glenn Randers-Pehrson | 23d3970 | 2010-12-06 18:28:02 -0600 | [diff] [blame] | 1105 | PNG_ALLOCATED); |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 1106 | |
John Bowler | 40b2603 | 2011-12-22 08:09:15 -0600 | [diff] [blame] | 1107 | /* DEPRECATED: this function allowed init structures to be created using the |
| 1108 | * default allocation method (typically malloc). Use is deprecated in 1.6.0 and |
| 1109 | * the API will be removed in the future. |
| 1110 | */ |
John Bowler | d332c67 | 2011-12-21 17:36:12 -0600 | [diff] [blame] | 1111 | PNG_EXPORTA(19, void, png_info_init_3, (png_infopp info_ptr, |
| 1112 | png_size_t png_info_struct_size), PNG_DEPRECATED); |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 1113 | |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 1114 | /* Writes all the PNG information before the image. */ |
Glenn Randers-Pehrson | 23d3970 | 2010-12-06 18:28:02 -0600 | [diff] [blame] | 1115 | PNG_EXPORT(20, void, png_write_info_before_PLTE, |
Glenn Randers-Pehrson | 871b1d0 | 2013-03-02 14:58:22 -0600 | [diff] [blame] | 1116 | (png_structrp png_ptr, png_const_inforp info_ptr)); |
Glenn Randers-Pehrson | 23d3970 | 2010-12-06 18:28:02 -0600 | [diff] [blame] | 1117 | PNG_EXPORT(21, void, png_write_info, |
Glenn Randers-Pehrson | 871b1d0 | 2013-03-02 14:58:22 -0600 | [diff] [blame] | 1118 | (png_structrp png_ptr, png_const_inforp info_ptr)); |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 1119 | |
Glenn Randers-Pehrson | dbd4014 | 2009-08-31 08:42:02 -0500 | [diff] [blame] | 1120 | #ifdef PNG_SEQUENTIAL_READ_SUPPORTED |
Glenn Randers-Pehrson | 6c7a09a | 2009-06-15 21:57:39 -0500 | [diff] [blame] | 1121 | /* Read the information before the actual image data. */ |
Glenn Randers-Pehrson | 23d3970 | 2010-12-06 18:28:02 -0600 | [diff] [blame] | 1122 | PNG_EXPORT(22, void, png_read_info, |
John Bowler | 5d56786 | 2011-12-24 09:12:00 -0600 | [diff] [blame] | 1123 | (png_structrp png_ptr, png_inforp info_ptr)); |
Glenn Randers-Pehrson | 5fea36f | 2004-07-28 08:20:44 -0500 | [diff] [blame] | 1124 | #endif |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 1125 | |
Glenn Randers-Pehrson | 4e6b5e9 | 2009-09-23 10:24:53 -0500 | [diff] [blame] | 1126 | #ifdef PNG_TIME_RFC1123_SUPPORTED |
John Bowler | 40b2603 | 2011-12-22 08:09:15 -0600 | [diff] [blame] | 1127 | /* Convert to a US string format: there is no localization support in this |
| 1128 | * routine. The original implementation used a 29 character buffer in |
| 1129 | * png_struct, this will be removed in future versions. |
| 1130 | */ |
| 1131 | #if PNG_LIBPNG_VER < 10700 |
Glenn Randers-Pehrson | 871b1d0 | 2013-03-02 14:58:22 -0600 | [diff] [blame] | 1132 | /* To do: remove this from libpng17 (and from libpng17/png.c and pngstruct.h) */ |
John Bowler | 5d56786 | 2011-12-24 09:12:00 -0600 | [diff] [blame] | 1133 | PNG_EXPORTA(23, png_const_charp, png_convert_to_rfc1123, (png_structrp png_ptr, |
John Bowler | 40b2603 | 2011-12-22 08:09:15 -0600 | [diff] [blame] | 1134 | png_const_timep ptime),PNG_DEPRECATED); |
| 1135 | #endif |
| 1136 | PNG_EXPORT(241, int, png_convert_to_rfc1123_buffer, (char out[29], |
Glenn Randers-Pehrson | 23d3970 | 2010-12-06 18:28:02 -0600 | [diff] [blame] | 1137 | png_const_timep ptime)); |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame] | 1138 | #endif |
Glenn Randers-Pehrson | b6ce43d | 1998-01-01 07:13:13 -0600 | [diff] [blame] | 1139 | |
Glenn Randers-Pehrson | 0cb46e2 | 2009-11-02 11:24:33 -0600 | [diff] [blame] | 1140 | #ifdef PNG_CONVERT_tIME_SUPPORTED |
Glenn Randers-Pehrson | 6c7a09a | 2009-06-15 21:57:39 -0500 | [diff] [blame] | 1141 | /* Convert from a struct tm to png_time */ |
Glenn Randers-Pehrson | c36bb79 | 2011-02-12 09:49:07 -0600 | [diff] [blame] | 1142 | PNG_EXPORT(24, void, png_convert_from_struct_tm, (png_timep ptime, |
John Bowler | baeb6d1 | 2011-11-26 18:21:02 -0600 | [diff] [blame] | 1143 | const struct tm * ttime)); |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 1144 | |
Glenn Randers-Pehrson | 6c7a09a | 2009-06-15 21:57:39 -0500 | [diff] [blame] | 1145 | /* Convert from time_t to png_time. Uses gmtime() */ |
John Bowler | 40b2603 | 2011-12-22 08:09:15 -0600 | [diff] [blame] | 1146 | PNG_EXPORT(25, void, png_convert_from_time_t, (png_timep ptime, time_t ttime)); |
Glenn Randers-Pehrson | 0cb46e2 | 2009-11-02 11:24:33 -0600 | [diff] [blame] | 1147 | #endif /* PNG_CONVERT_tIME_SUPPORTED */ |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 1148 | |
Glenn Randers-Pehrson | 4e6b5e9 | 2009-09-23 10:24:53 -0500 | [diff] [blame] | 1149 | #ifdef PNG_READ_EXPAND_SUPPORTED |
Glenn Randers-Pehrson | 4393a9a | 1999-09-17 12:27:26 -0500 | [diff] [blame] | 1150 | /* Expand data to 24-bit RGB, or 8-bit grayscale, with alpha if available. */ |
John Bowler | 5d56786 | 2011-12-24 09:12:00 -0600 | [diff] [blame] | 1151 | PNG_EXPORT(26, void, png_set_expand, (png_structrp png_ptr)); |
| 1152 | PNG_EXPORT(27, void, png_set_expand_gray_1_2_4_to_8, (png_structrp png_ptr)); |
| 1153 | PNG_EXPORT(28, void, png_set_palette_to_rgb, (png_structrp png_ptr)); |
| 1154 | PNG_EXPORT(29, void, png_set_tRNS_to_alpha, (png_structrp png_ptr)); |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame] | 1155 | #endif |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 1156 | |
John Bowler | 4d56296 | 2011-02-12 09:01:20 -0600 | [diff] [blame] | 1157 | #ifdef PNG_READ_EXPAND_16_SUPPORTED |
Glenn Randers-Pehrson | d768d10 | 2011-05-08 23:26:19 -0500 | [diff] [blame] | 1158 | /* Expand to 16-bit channels, forces conversion of palette to RGB and expansion |
John Bowler | 4d56296 | 2011-02-12 09:01:20 -0600 | [diff] [blame] | 1159 | * of a tRNS chunk if present. |
| 1160 | */ |
John Bowler | 5d56786 | 2011-12-24 09:12:00 -0600 | [diff] [blame] | 1161 | PNG_EXPORT(221, void, png_set_expand_16, (png_structrp png_ptr)); |
John Bowler | 4d56296 | 2011-02-12 09:01:20 -0600 | [diff] [blame] | 1162 | #endif |
| 1163 | |
Guy Schalnat | 51f0eb4 | 1995-09-26 05:22:39 -0500 | [diff] [blame] | 1164 | #if defined(PNG_READ_BGR_SUPPORTED) || defined(PNG_WRITE_BGR_SUPPORTED) |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 1165 | /* Use blue, green, red order for pixels. */ |
John Bowler | 5d56786 | 2011-12-24 09:12:00 -0600 | [diff] [blame] | 1166 | PNG_EXPORT(30, void, png_set_bgr, (png_structrp png_ptr)); |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame] | 1167 | #endif |
Guy Schalnat | 51f0eb4 | 1995-09-26 05:22:39 -0500 | [diff] [blame] | 1168 | |
Glenn Randers-Pehrson | 4e6b5e9 | 2009-09-23 10:24:53 -0500 | [diff] [blame] | 1169 | #ifdef PNG_READ_GRAY_TO_RGB_SUPPORTED |
Glenn Randers-Pehrson | 4393a9a | 1999-09-17 12:27:26 -0500 | [diff] [blame] | 1170 | /* Expand the grayscale to 24-bit RGB if necessary. */ |
John Bowler | 5d56786 | 2011-12-24 09:12:00 -0600 | [diff] [blame] | 1171 | PNG_EXPORT(31, void, png_set_gray_to_rgb, (png_structrp png_ptr)); |
John Bowler | f21a0d0 | 2011-01-23 23:55:19 -0600 | [diff] [blame] | 1172 | #endif |
Guy Schalnat | 69b1448 | 1996-01-10 02:56:49 -0600 | [diff] [blame] | 1173 | |
John Bowler | f21a0d0 | 2011-01-23 23:55:19 -0600 | [diff] [blame] | 1174 | #ifdef PNG_READ_RGB_TO_GRAY_SUPPORTED |
Glenn Randers-Pehrson | 5c6aeb2 | 1998-12-29 11:47:59 -0600 | [diff] [blame] | 1175 | /* Reduce RGB to grayscale. */ |
John Bowler | 7875d53 | 2011-11-07 22:33:49 -0600 | [diff] [blame] | 1176 | #define PNG_ERROR_ACTION_NONE 1 |
| 1177 | #define PNG_ERROR_ACTION_WARN 2 |
| 1178 | #define PNG_ERROR_ACTION_ERROR 3 |
| 1179 | #define PNG_RGB_TO_GRAY_DEFAULT (-1)/*for red/green coefficients*/ |
| 1180 | |
John Bowler | 5d56786 | 2011-12-24 09:12:00 -0600 | [diff] [blame] | 1181 | PNG_FP_EXPORT(32, void, png_set_rgb_to_gray, (png_structrp png_ptr, |
Glenn Randers-Pehrson | 871b1d0 | 2013-03-02 14:58:22 -0600 | [diff] [blame] | 1182 | int error_action, double red, double green)) |
John Bowler | 5d56786 | 2011-12-24 09:12:00 -0600 | [diff] [blame] | 1183 | PNG_FIXED_EXPORT(33, void, png_set_rgb_to_gray_fixed, (png_structrp png_ptr, |
Glenn Randers-Pehrson | 871b1d0 | 2013-03-02 14:58:22 -0600 | [diff] [blame] | 1184 | int error_action, png_fixed_point red, png_fixed_point green)) |
Glenn Randers-Pehrson | a272d8f | 2010-06-25 21:45:31 -0500 | [diff] [blame] | 1185 | |
John Bowler | 5d56786 | 2011-12-24 09:12:00 -0600 | [diff] [blame] | 1186 | PNG_EXPORT(34, png_byte, png_get_rgb_to_gray_status, (png_const_structrp |
Glenn Randers-Pehrson | b86b492 | 2011-01-21 23:12:51 -0600 | [diff] [blame] | 1187 | png_ptr)); |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame] | 1188 | #endif |
Andreas Dilger | 02ad0ef | 1997-01-17 01:34:35 -0600 | [diff] [blame] | 1189 | |
John Bowler | 4a12f4a | 2011-04-17 18:34:22 -0500 | [diff] [blame] | 1190 | #ifdef PNG_BUILD_GRAYSCALE_PALETTE_SUPPORTED |
Glenn Randers-Pehrson | c36bb79 | 2011-02-12 09:49:07 -0600 | [diff] [blame] | 1191 | PNG_EXPORT(35, void, png_build_grayscale_palette, (int bit_depth, |
Glenn Randers-Pehrson | 23d3970 | 2010-12-06 18:28:02 -0600 | [diff] [blame] | 1192 | png_colorp palette)); |
John Bowler | 4a12f4a | 2011-04-17 18:34:22 -0500 | [diff] [blame] | 1193 | #endif |
Andreas Dilger | 02ad0ef | 1997-01-17 01:34:35 -0600 | [diff] [blame] | 1194 | |
John Bowler | d273ad2 | 2011-05-07 21:00:28 -0500 | [diff] [blame] | 1195 | #ifdef PNG_READ_ALPHA_MODE_SUPPORTED |
| 1196 | /* How the alpha channel is interpreted - this affects how the color channels of |
Glenn Randers-Pehrson | 44e26d4 | 2011-05-08 22:56:42 -0500 | [diff] [blame] | 1197 | * a PNG file are returned when an alpha channel, or tRNS chunk in a palette |
| 1198 | * file, is present. |
John Bowler | d273ad2 | 2011-05-07 21:00:28 -0500 | [diff] [blame] | 1199 | * |
Glenn Randers-Pehrson | 44e26d4 | 2011-05-08 22:56:42 -0500 | [diff] [blame] | 1200 | * This has no effect on the way pixels are written into a PNG output |
| 1201 | * datastream. The color samples in a PNG datastream are never premultiplied |
| 1202 | * with the alpha samples. |
| 1203 | * |
| 1204 | * The default is to return data according to the PNG specification: the alpha |
John Bowler | d273ad2 | 2011-05-07 21:00:28 -0500 | [diff] [blame] | 1205 | * channel is a linear measure of the contribution of the pixel to the |
Glenn Randers-Pehrson | 44e26d4 | 2011-05-08 22:56:42 -0500 | [diff] [blame] | 1206 | * corresponding composited pixel. The gamma encoded color channels must be |
| 1207 | * scaled according to the contribution and to do this it is necessary to undo |
| 1208 | * the encoding, scale the color values, perform the composition and reencode |
| 1209 | * the values. This is the 'PNG' mode. |
John Bowler | d273ad2 | 2011-05-07 21:00:28 -0500 | [diff] [blame] | 1210 | * |
| 1211 | * The alternative is to 'associate' the alpha with the color information by |
| 1212 | * storing color channel values that have been scaled by the alpha. The |
| 1213 | * advantage is that the color channels can be resampled (the image can be |
| 1214 | * scaled) in this form. The disadvantage is that normal practice is to store |
Glenn Randers-Pehrson | d768d10 | 2011-05-08 23:26:19 -0500 | [diff] [blame] | 1215 | * linear, not (gamma) encoded, values and this requires 16-bit channels for |
| 1216 | * still images rather than the 8-bit channels that are just about sufficient if |
John Bowler | d273ad2 | 2011-05-07 21:00:28 -0500 | [diff] [blame] | 1217 | * gamma encoding is used. In addition all non-transparent pixel values, |
| 1218 | * including completely opaque ones, must be gamma encoded to produce the final |
Glenn Randers-Pehrson | d768d10 | 2011-05-08 23:26:19 -0500 | [diff] [blame] | 1219 | * image. This is the 'STANDARD', 'ASSOCIATED' or 'PREMULTIPLIED' mode (the |
John Bowler | d273ad2 | 2011-05-07 21:00:28 -0500 | [diff] [blame] | 1220 | * latter being the two common names for associated alpha color channels.) |
| 1221 | * |
| 1222 | * Since it is not necessary to perform arithmetic on opaque color values so |
| 1223 | * long as they are not to be resampled and are in the final color space it is |
| 1224 | * possible to optimize the handling of alpha by storing the opaque pixels in |
| 1225 | * the PNG format (adjusted for the output color space) while storing partially |
| 1226 | * opaque pixels in the standard, linear, format. The accuracy required for |
| 1227 | * standard alpha composition is relatively low, because the pixels are |
Glenn Randers-Pehrson | d768d10 | 2011-05-08 23:26:19 -0500 | [diff] [blame] | 1228 | * isolated, therefore typically the accuracy loss in storing 8-bit linear |
John Bowler | d273ad2 | 2011-05-07 21:00:28 -0500 | [diff] [blame] | 1229 | * values is acceptable. (This is not true if the alpha channel is used to |
Glenn Randers-Pehrson | d768d10 | 2011-05-08 23:26:19 -0500 | [diff] [blame] | 1230 | * simulate transparency over large areas - use 16 bits or the PNG mode in |
| 1231 | * this case!) This is the 'OPTIMIZED' mode. For this mode a pixel is |
John Bowler | d273ad2 | 2011-05-07 21:00:28 -0500 | [diff] [blame] | 1232 | * treated as opaque only if the alpha value is equal to the maximum value. |
| 1233 | * |
| 1234 | * The final choice is to gamma encode the alpha channel as well. This is |
| 1235 | * broken because, in practice, no implementation that uses this choice |
| 1236 | * correctly undoes the encoding before handling alpha composition. Use this |
| 1237 | * choice only if other serious errors in the software or hardware you use |
| 1238 | * mandate it; the typical serious error is for dark halos to appear around |
| 1239 | * opaque areas of the composited PNG image because of arithmetic overflow. |
| 1240 | * |
| 1241 | * The API function png_set_alpha_mode specifies which of these choices to use |
Glenn Randers-Pehrson | d768d10 | 2011-05-08 23:26:19 -0500 | [diff] [blame] | 1242 | * with an enumerated 'mode' value and the gamma of the required output: |
John Bowler | d273ad2 | 2011-05-07 21:00:28 -0500 | [diff] [blame] | 1243 | */ |
| 1244 | #define PNG_ALPHA_PNG 0 /* according to the PNG standard */ |
| 1245 | #define PNG_ALPHA_STANDARD 1 /* according to Porter/Duff */ |
| 1246 | #define PNG_ALPHA_ASSOCIATED 1 /* as above; this is the normal practice */ |
| 1247 | #define PNG_ALPHA_PREMULTIPLIED 1 /* as above */ |
| 1248 | #define PNG_ALPHA_OPTIMIZED 2 /* 'PNG' for opaque pixels, else 'STANDARD' */ |
| 1249 | #define PNG_ALPHA_BROKEN 3 /* the alpha channel is gamma encoded */ |
| 1250 | |
John Bowler | 5d56786 | 2011-12-24 09:12:00 -0600 | [diff] [blame] | 1251 | PNG_FP_EXPORT(227, void, png_set_alpha_mode, (png_structrp png_ptr, int mode, |
Glenn Randers-Pehrson | 871b1d0 | 2013-03-02 14:58:22 -0600 | [diff] [blame] | 1252 | double output_gamma)) |
John Bowler | 5d56786 | 2011-12-24 09:12:00 -0600 | [diff] [blame] | 1253 | PNG_FIXED_EXPORT(228, void, png_set_alpha_mode_fixed, (png_structrp png_ptr, |
Glenn Randers-Pehrson | 871b1d0 | 2013-03-02 14:58:22 -0600 | [diff] [blame] | 1254 | int mode, png_fixed_point output_gamma)) |
John Bowler | f70c7d0 | 2011-05-10 22:54:37 -0500 | [diff] [blame] | 1255 | #endif |
John Bowler | d273ad2 | 2011-05-07 21:00:28 -0500 | [diff] [blame] | 1256 | |
Glenn Randers-Pehrson | 871b1d0 | 2013-03-02 14:58:22 -0600 | [diff] [blame] | 1257 | #if defined(PNG_GAMMA_SUPPORTED) || defined(PNG_READ_ALPHA_MODE_SUPPORTED) |
John Bowler | d273ad2 | 2011-05-07 21:00:28 -0500 | [diff] [blame] | 1258 | /* The output_gamma value is a screen gamma in libpng terminology: it expresses |
| 1259 | * how to decode the output values, not how they are encoded. The values used |
| 1260 | * correspond to the normal numbers used to describe the overall gamma of a |
| 1261 | * computer display system; for example 2.2 for an sRGB conformant system. The |
| 1262 | * values are scaled by 100000 in the _fixed version of the API (so 220000 for |
| 1263 | * sRGB.) |
| 1264 | * |
| 1265 | * The inverse of the value is always used to provide a default for the PNG file |
| 1266 | * encoding if it has no gAMA chunk and if png_set_gamma() has not been called |
| 1267 | * to override the PNG gamma information. |
| 1268 | * |
| 1269 | * When the ALPHA_OPTIMIZED mode is selected the output gamma is used to encode |
| 1270 | * opaque pixels however pixels with lower alpha values are not encoded, |
| 1271 | * regardless of the output gamma setting. |
| 1272 | * |
| 1273 | * When the standard Porter Duff handling is requested with mode 1 the output |
| 1274 | * encoding is set to be linear and the output_gamma value is only relevant |
| 1275 | * as a default for input data that has no gamma information. The linear output |
| 1276 | * encoding will be overridden if png_set_gamma() is called - the results may be |
| 1277 | * highly unexpected! |
| 1278 | * |
| 1279 | * The following numbers are derived from the sRGB standard and the research |
| 1280 | * behind it. sRGB is defined to be approximated by a PNG gAMA chunk value of |
| 1281 | * 0.45455 (1/2.2) for PNG. The value implicitly includes any viewing |
| 1282 | * correction required to take account of any differences in the color |
| 1283 | * environment of the original scene and the intended display environment; the |
| 1284 | * value expresses how to *decode* the image for display, not how the original |
| 1285 | * data was *encoded*. |
| 1286 | * |
| 1287 | * sRGB provides a peg for the PNG standard by defining a viewing environment. |
| 1288 | * sRGB itself, and earlier TV standards, actually use a more complex transform |
| 1289 | * (a linear portion then a gamma 2.4 power law) than PNG can express. (PNG is |
| 1290 | * limited to simple power laws.) By saying that an image for direct display on |
| 1291 | * an sRGB conformant system should be stored with a gAMA chunk value of 45455 |
| 1292 | * (11.3.3.2 and 11.3.3.5 of the ISO PNG specification) the PNG specification |
| 1293 | * makes it possible to derive values for other display systems and |
| 1294 | * environments. |
| 1295 | * |
| 1296 | * The Mac value is deduced from the sRGB based on an assumption that the actual |
| 1297 | * extra viewing correction used in early Mac display systems was implemented as |
| 1298 | * a power 1.45 lookup table. |
| 1299 | * |
| 1300 | * Any system where a programmable lookup table is used or where the behavior of |
| 1301 | * the final display device characteristics can be changed requires system |
| 1302 | * specific code to obtain the current characteristic. However this can be |
| 1303 | * difficult and most PNG gamma correction only requires an approximate value. |
| 1304 | * |
| 1305 | * By default, if png_set_alpha_mode() is not called, libpng assumes that all |
| 1306 | * values are unencoded, linear, values and that the output device also has a |
| 1307 | * linear characteristic. This is only very rarely correct - it is invariably |
| 1308 | * better to call png_set_alpha_mode() with PNG_DEFAULT_sRGB than rely on the |
| 1309 | * default if you don't know what the right answer is! |
| 1310 | * |
John Bowler | f70c7d0 | 2011-05-10 22:54:37 -0500 | [diff] [blame] | 1311 | * The special value PNG_GAMMA_MAC_18 indicates an older Mac system (pre Mac OS |
| 1312 | * 10.6) which used a correction table to implement a somewhat lower gamma on an |
| 1313 | * otherwise sRGB system. |
| 1314 | * |
| 1315 | * Both these values are reserved (not simple gamma values) in order to allow |
| 1316 | * more precise correction internally in the future. |
| 1317 | * |
John Bowler | d273ad2 | 2011-05-07 21:00:28 -0500 | [diff] [blame] | 1318 | * NOTE: the following values can be passed to either the fixed or floating |
| 1319 | * point APIs, but the floating point API will also accept floating point |
| 1320 | * values. |
| 1321 | */ |
John Bowler | f70c7d0 | 2011-05-10 22:54:37 -0500 | [diff] [blame] | 1322 | #define PNG_DEFAULT_sRGB -1 /* sRGB gamma and color space */ |
| 1323 | #define PNG_GAMMA_MAC_18 -2 /* Old Mac '1.8' gamma and color space */ |
Glenn Randers-Pehrson | c782251 | 2011-05-07 21:23:43 -0500 | [diff] [blame] | 1324 | #define PNG_GAMMA_sRGB 220000 /* Television standards--matches sRGB gamma */ |
John Bowler | d273ad2 | 2011-05-07 21:00:28 -0500 | [diff] [blame] | 1325 | #define PNG_GAMMA_LINEAR PNG_FP_1 /* Linear */ |
John Bowler | f70c7d0 | 2011-05-10 22:54:37 -0500 | [diff] [blame] | 1326 | #endif |
John Bowler | d273ad2 | 2011-05-07 21:00:28 -0500 | [diff] [blame] | 1327 | |
| 1328 | /* The following are examples of calls to png_set_alpha_mode to achieve the |
| 1329 | * required overall gamma correction and, where necessary, alpha |
| 1330 | * premultiplication. |
| 1331 | * |
| 1332 | * png_set_alpha_mode(pp, PNG_ALPHA_PNG, PNG_DEFAULT_sRGB); |
| 1333 | * This is the default libpng handling of the alpha channel - it is not |
| 1334 | * pre-multiplied into the color components. In addition the call states |
| 1335 | * that the output is for a sRGB system and causes all PNG files without gAMA |
| 1336 | * chunks to be assumed to be encoded using sRGB. |
| 1337 | * |
| 1338 | * png_set_alpha_mode(pp, PNG_ALPHA_PNG, PNG_GAMMA_MAC); |
| 1339 | * In this case the output is assumed to be something like an sRGB conformant |
| 1340 | * display preceeded by a power-law lookup table of power 1.45. This is how |
| 1341 | * early Mac systems behaved. |
| 1342 | * |
Glenn Randers-Pehrson | c782251 | 2011-05-07 21:23:43 -0500 | [diff] [blame] | 1343 | * png_set_alpha_mode(pp, PNG_ALPHA_STANDARD, PNG_GAMMA_LINEAR); |
John Bowler | d273ad2 | 2011-05-07 21:00:28 -0500 | [diff] [blame] | 1344 | * This is the classic Jim Blinn approach and will work in academic |
| 1345 | * environments where everything is done by the book. It has the shortcoming |
| 1346 | * of assuming that input PNG data with no gamma information is linear - this |
| 1347 | * is unlikely to be correct unless the PNG files where generated locally. |
| 1348 | * Most of the time the output precision will be so low as to show |
| 1349 | * significant banding in dark areas of the image. |
| 1350 | * |
| 1351 | * png_set_expand_16(pp); |
| 1352 | * png_set_alpha_mode(pp, PNG_ALPHA_STANDARD, PNG_DEFAULT_sRGB); |
| 1353 | * This is a somewhat more realistic Jim Blinn inspired approach. PNG files |
| 1354 | * are assumed to have the sRGB encoding if not marked with a gamma value and |
| 1355 | * the output is always 16 bits per component. This permits accurate scaling |
| 1356 | * and processing of the data. If you know that your input PNG files were |
| 1357 | * generated locally you might need to replace PNG_DEFAULT_sRGB with the |
| 1358 | * correct value for your system. |
| 1359 | * |
| 1360 | * png_set_alpha_mode(pp, PNG_ALPHA_OPTIMIZED, PNG_DEFAULT_sRGB); |
| 1361 | * If you just need to composite the PNG image onto an existing background |
| 1362 | * and if you control the code that does this you can use the optimization |
| 1363 | * setting. In this case you just copy completely opaque pixels to the |
| 1364 | * output. For pixels that are not completely transparent (you just skip |
| 1365 | * those) you do the composition math using png_composite or png_composite_16 |
Glenn Randers-Pehrson | d768d10 | 2011-05-08 23:26:19 -0500 | [diff] [blame] | 1366 | * below then encode the resultant 8-bit or 16-bit values to match the output |
John Bowler | d273ad2 | 2011-05-07 21:00:28 -0500 | [diff] [blame] | 1367 | * encoding. |
| 1368 | * |
| 1369 | * Other cases |
| 1370 | * If neither the PNG nor the standard linear encoding work for you because |
| 1371 | * of the software or hardware you use then you have a big problem. The PNG |
| 1372 | * case will probably result in halos around the image. The linear encoding |
| 1373 | * will probably result in a washed out, too bright, image (it's actually too |
| 1374 | * contrasty.) Try the ALPHA_OPTIMIZED mode above - this will probably |
| 1375 | * substantially reduce the halos. Alternatively try: |
| 1376 | * |
| 1377 | * png_set_alpha_mode(pp, PNG_ALPHA_BROKEN, PNG_DEFAULT_sRGB); |
| 1378 | * This option will also reduce the halos, but there will be slight dark |
| 1379 | * halos round the opaque parts of the image where the background is light. |
| 1380 | * In the OPTIMIZED mode the halos will be light halos where the background |
| 1381 | * is dark. Take your pick - the halos are unavoidable unless you can get |
| 1382 | * your hardware/software fixed! (The OPTIMIZED approach is slightly |
| 1383 | * faster.) |
| 1384 | * |
| 1385 | * When the default gamma of PNG files doesn't match the output gamma. |
| 1386 | * If you have PNG files with no gamma information png_set_alpha_mode allows |
| 1387 | * you to provide a default gamma, but it also sets the ouput gamma to the |
| 1388 | * matching value. If you know your PNG files have a gamma that doesn't |
| 1389 | * match the output you can take advantage of the fact that |
| 1390 | * png_set_alpha_mode always sets the output gamma but only sets the PNG |
| 1391 | * default if it is not already set: |
| 1392 | * |
| 1393 | * png_set_alpha_mode(pp, PNG_ALPHA_PNG, PNG_DEFAULT_sRGB); |
| 1394 | * png_set_alpha_mode(pp, PNG_ALPHA_PNG, PNG_GAMMA_MAC); |
| 1395 | * The first call sets both the default and the output gamma values, the |
| 1396 | * second call overrides the output gamma without changing the default. This |
| 1397 | * is easier than achieving the same effect with png_set_gamma. You must use |
| 1398 | * PNG_ALPHA_PNG for the first call - internal checking in png_set_alpha will |
| 1399 | * fire if more than one call to png_set_alpha_mode and png_set_background is |
| 1400 | * made in the same read operation, however multiple calls with PNG_ALPHA_PNG |
| 1401 | * are ignored. |
| 1402 | */ |
John Bowler | d273ad2 | 2011-05-07 21:00:28 -0500 | [diff] [blame] | 1403 | |
Glenn Randers-Pehrson | 4e6b5e9 | 2009-09-23 10:24:53 -0500 | [diff] [blame] | 1404 | #ifdef PNG_READ_STRIP_ALPHA_SUPPORTED |
John Bowler | 5d56786 | 2011-12-24 09:12:00 -0600 | [diff] [blame] | 1405 | PNG_EXPORT(36, void, png_set_strip_alpha, (png_structrp png_ptr)); |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame] | 1406 | #endif |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 1407 | |
| 1408 | #if defined(PNG_READ_SWAP_ALPHA_SUPPORTED) || \ |
| 1409 | defined(PNG_WRITE_SWAP_ALPHA_SUPPORTED) |
John Bowler | 5d56786 | 2011-12-24 09:12:00 -0600 | [diff] [blame] | 1410 | PNG_EXPORT(37, void, png_set_swap_alpha, (png_structrp png_ptr)); |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame] | 1411 | #endif |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 1412 | |
Glenn Randers-Pehrson | c4a2ae6 | 1998-01-16 22:06:18 -0600 | [diff] [blame] | 1413 | #if defined(PNG_READ_INVERT_ALPHA_SUPPORTED) || \ |
| 1414 | defined(PNG_WRITE_INVERT_ALPHA_SUPPORTED) |
John Bowler | 5d56786 | 2011-12-24 09:12:00 -0600 | [diff] [blame] | 1415 | PNG_EXPORT(38, void, png_set_invert_alpha, (png_structrp png_ptr)); |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame] | 1416 | #endif |
Glenn Randers-Pehrson | c4a2ae6 | 1998-01-16 22:06:18 -0600 | [diff] [blame] | 1417 | |
Guy Schalnat | 51f0eb4 | 1995-09-26 05:22:39 -0500 | [diff] [blame] | 1418 | #if defined(PNG_READ_FILLER_SUPPORTED) || defined(PNG_WRITE_FILLER_SUPPORTED) |
Glenn Randers-Pehrson | 67864af | 2004-08-28 23:30:07 -0500 | [diff] [blame] | 1419 | /* Add a filler byte to 8-bit Gray or 24-bit RGB images. */ |
John Bowler | 5d56786 | 2011-12-24 09:12:00 -0600 | [diff] [blame] | 1420 | PNG_EXPORT(39, void, png_set_filler, (png_structrp png_ptr, png_uint_32 filler, |
Glenn Randers-Pehrson | 23d3970 | 2010-12-06 18:28:02 -0600 | [diff] [blame] | 1421 | int flags)); |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 1422 | /* The values of the PNG_FILLER_ defines should NOT be changed */ |
Glenn Randers-Pehrson | d4df36c | 2010-03-06 10:45:55 -0600 | [diff] [blame] | 1423 | # define PNG_FILLER_BEFORE 0 |
| 1424 | # define PNG_FILLER_AFTER 1 |
Glenn Randers-Pehrson | 67864af | 2004-08-28 23:30:07 -0500 | [diff] [blame] | 1425 | /* Add an alpha byte to 8-bit Gray or 24-bit RGB images. */ |
John Bowler | 5d56786 | 2011-12-24 09:12:00 -0600 | [diff] [blame] | 1426 | PNG_EXPORT(40, void, png_set_add_alpha, (png_structrp png_ptr, |
John Bowler | 40b2603 | 2011-12-22 08:09:15 -0600 | [diff] [blame] | 1427 | png_uint_32 filler, int flags)); |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 1428 | #endif /* PNG_READ_FILLER_SUPPORTED || PNG_WRITE_FILLER_SUPPORTED */ |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 1429 | |
Guy Schalnat | 51f0eb4 | 1995-09-26 05:22:39 -0500 | [diff] [blame] | 1430 | #if defined(PNG_READ_SWAP_SUPPORTED) || defined(PNG_WRITE_SWAP_SUPPORTED) |
Glenn Randers-Pehrson | 4393a9a | 1999-09-17 12:27:26 -0500 | [diff] [blame] | 1431 | /* Swap bytes in 16-bit depth files. */ |
John Bowler | 5d56786 | 2011-12-24 09:12:00 -0600 | [diff] [blame] | 1432 | PNG_EXPORT(41, void, png_set_swap, (png_structrp png_ptr)); |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame] | 1433 | #endif |
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_PACK_SUPPORTED) || defined(PNG_WRITE_PACK_SUPPORTED) |
Glenn Randers-Pehrson | 4393a9a | 1999-09-17 12:27:26 -0500 | [diff] [blame] | 1436 | /* Use 1 byte per pixel in 1, 2, or 4-bit depth files. */ |
John Bowler | 5d56786 | 2011-12-24 09:12:00 -0600 | [diff] [blame] | 1437 | PNG_EXPORT(42, void, png_set_packing, (png_structrp png_ptr)); |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame] | 1438 | #endif |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 1439 | |
Glenn Randers-Pehrson | e3f3c4e | 2010-02-07 18:08:50 -0600 | [diff] [blame] | 1440 | #if defined(PNG_READ_PACKSWAP_SUPPORTED) || \ |
| 1441 | defined(PNG_WRITE_PACKSWAP_SUPPORTED) |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 1442 | /* Swap packing order of pixels in bytes. */ |
John Bowler | 5d56786 | 2011-12-24 09:12:00 -0600 | [diff] [blame] | 1443 | PNG_EXPORT(43, void, png_set_packswap, (png_structrp png_ptr)); |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame] | 1444 | #endif |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 1445 | |
Guy Schalnat | 51f0eb4 | 1995-09-26 05:22:39 -0500 | [diff] [blame] | 1446 | #if defined(PNG_READ_SHIFT_SUPPORTED) || defined(PNG_WRITE_SHIFT_SUPPORTED) |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 1447 | /* Converts files to legal bit depths. */ |
John Bowler | 5d56786 | 2011-12-24 09:12:00 -0600 | [diff] [blame] | 1448 | PNG_EXPORT(44, void, png_set_shift, (png_structrp png_ptr, png_const_color_8p |
Glenn Randers-Pehrson | 23d3970 | 2010-12-06 18:28:02 -0600 | [diff] [blame] | 1449 | true_bits)); |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame] | 1450 | #endif |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 1451 | |
Guy Schalnat | 51f0eb4 | 1995-09-26 05:22:39 -0500 | [diff] [blame] | 1452 | #if defined(PNG_READ_INTERLACING_SUPPORTED) || \ |
| 1453 | defined(PNG_WRITE_INTERLACING_SUPPORTED) |
Glenn Randers-Pehrson | 31aee0d | 2010-07-29 17:39:14 -0500 | [diff] [blame] | 1454 | /* Have the code handle the interlacing. Returns the number of passes. |
Glenn Randers-Pehrson | 9f044c1 | 2010-12-07 14:59:43 -0600 | [diff] [blame] | 1455 | * MUST be called before png_read_update_info or png_start_read_image, |
| 1456 | * otherwise it will not have the desired effect. Note that it is still |
| 1457 | * necessary to call png_read_row or png_read_rows png_get_image_height |
| 1458 | * times for each pass. |
| 1459 | */ |
John Bowler | 5d56786 | 2011-12-24 09:12:00 -0600 | [diff] [blame] | 1460 | PNG_EXPORT(45, int, png_set_interlace_handling, (png_structrp png_ptr)); |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame] | 1461 | #endif |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 1462 | |
Guy Schalnat | 51f0eb4 | 1995-09-26 05:22:39 -0500 | [diff] [blame] | 1463 | #if defined(PNG_READ_INVERT_SUPPORTED) || defined(PNG_WRITE_INVERT_SUPPORTED) |
Glenn Randers-Pehrson | 104622b | 2000-05-29 08:58:03 -0500 | [diff] [blame] | 1464 | /* Invert monochrome files */ |
John Bowler | 5d56786 | 2011-12-24 09:12:00 -0600 | [diff] [blame] | 1465 | PNG_EXPORT(46, void, png_set_invert_mono, (png_structrp png_ptr)); |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame] | 1466 | #endif |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 1467 | |
Glenn Randers-Pehrson | 4e6b5e9 | 2009-09-23 10:24:53 -0500 | [diff] [blame] | 1468 | #ifdef PNG_READ_BACKGROUND_SUPPORTED |
John Bowler | cb0b296 | 2011-05-12 21:48:29 -0500 | [diff] [blame] | 1469 | /* Handle alpha and tRNS by replacing with a background color. Prior to |
Glenn Randers-Pehrson | ef217b7 | 2011-06-15 12:58:27 -0500 | [diff] [blame] | 1470 | * libpng-1.5.4 this API must not be called before the PNG file header has been |
John Bowler | cb0b296 | 2011-05-12 21:48:29 -0500 | [diff] [blame] | 1471 | * read. Doing so will result in unexpected behavior and possible warnings or |
Glenn Randers-Pehrson | 1591a4c | 2011-05-16 09:07:26 -0500 | [diff] [blame] | 1472 | * errors if the PNG file contains a bKGD chunk. |
John Bowler | cb0b296 | 2011-05-12 21:48:29 -0500 | [diff] [blame] | 1473 | */ |
John Bowler | 5d56786 | 2011-12-24 09:12:00 -0600 | [diff] [blame] | 1474 | PNG_FP_EXPORT(47, void, png_set_background, (png_structrp png_ptr, |
Glenn Randers-Pehrson | c36bb79 | 2011-02-12 09:49:07 -0600 | [diff] [blame] | 1475 | png_const_color_16p background_color, int background_gamma_code, |
Glenn Randers-Pehrson | 871b1d0 | 2013-03-02 14:58:22 -0600 | [diff] [blame] | 1476 | int need_expand, double background_gamma)) |
John Bowler | 5d56786 | 2011-12-24 09:12:00 -0600 | [diff] [blame] | 1477 | PNG_FIXED_EXPORT(215, void, png_set_background_fixed, (png_structrp png_ptr, |
Glenn Randers-Pehrson | c36bb79 | 2011-02-12 09:49:07 -0600 | [diff] [blame] | 1478 | png_const_color_16p background_color, int background_gamma_code, |
Glenn Randers-Pehrson | 871b1d0 | 2013-03-02 14:58:22 -0600 | [diff] [blame] | 1479 | int need_expand, png_fixed_point background_gamma)) |
Glenn Randers-Pehrson | 31aee0d | 2010-07-29 17:39:14 -0500 | [diff] [blame] | 1480 | #endif |
| 1481 | #ifdef PNG_READ_BACKGROUND_SUPPORTED |
Glenn Randers-Pehrson | d4df36c | 2010-03-06 10:45:55 -0600 | [diff] [blame] | 1482 | # define PNG_BACKGROUND_GAMMA_UNKNOWN 0 |
| 1483 | # define PNG_BACKGROUND_GAMMA_SCREEN 1 |
| 1484 | # define PNG_BACKGROUND_GAMMA_FILE 2 |
| 1485 | # define PNG_BACKGROUND_GAMMA_UNIQUE 3 |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame] | 1486 | #endif |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 1487 | |
John Bowler | 8d26126 | 2011-06-18 13:37:11 -0500 | [diff] [blame] | 1488 | #ifdef PNG_READ_SCALE_16_TO_8_SUPPORTED |
Glenn Randers-Pehrson | 413138a | 2011-06-13 22:07:37 -0500 | [diff] [blame] | 1489 | /* Scale a 16-bit depth file down to 8-bit, accurately. */ |
John Bowler | 5d56786 | 2011-12-24 09:12:00 -0600 | [diff] [blame] | 1490 | PNG_EXPORT(229, void, png_set_scale_16, (png_structrp png_ptr)); |
John Bowler | 8d26126 | 2011-06-18 13:37:11 -0500 | [diff] [blame] | 1491 | #endif |
Glenn Randers-Pehrson | ab63dd0 | 2011-06-17 20:04:17 -0500 | [diff] [blame] | 1492 | |
John Bowler | 8d26126 | 2011-06-18 13:37:11 -0500 | [diff] [blame] | 1493 | #ifdef PNG_READ_STRIP_16_TO_8_SUPPORTED |
| 1494 | #define PNG_READ_16_TO_8 SUPPORTED /* Name prior to 1.5.4 */ |
Glenn Randers-Pehrson | 413138a | 2011-06-13 22:07:37 -0500 | [diff] [blame] | 1495 | /* Strip the second byte of information from a 16-bit depth file. */ |
John Bowler | 5d56786 | 2011-12-24 09:12:00 -0600 | [diff] [blame] | 1496 | PNG_EXPORT(48, void, png_set_strip_16, (png_structrp png_ptr)); |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame] | 1497 | #endif |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 1498 | |
Glenn Randers-Pehrson | 3cd7cff | 2010-04-16 19:27:08 -0500 | [diff] [blame] | 1499 | #ifdef PNG_READ_QUANTIZE_SUPPORTED |
| 1500 | /* Turn on quantizing, and reduce the palette to the number of colors |
Glenn Randers-Pehrson | e3f3c4e | 2010-02-07 18:08:50 -0600 | [diff] [blame] | 1501 | * available. |
| 1502 | */ |
Glenn Randers-Pehrson | 871b1d0 | 2013-03-02 14:58:22 -0600 | [diff] [blame] | 1503 | PNG_EXPORT(49, void, png_set_quantize, (png_structrp png_ptr, |
| 1504 | png_colorp palette, int num_palette, int maximum_colors, |
| 1505 | png_const_uint_16p histogram, int full_quantize)); |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame] | 1506 | #endif |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 1507 | |
Glenn Randers-Pehrson | 4e6b5e9 | 2009-09-23 10:24:53 -0500 | [diff] [blame] | 1508 | #ifdef PNG_READ_GAMMA_SUPPORTED |
Glenn Randers-Pehrson | 31aee0d | 2010-07-29 17:39:14 -0500 | [diff] [blame] | 1509 | /* The threshold on gamma processing is configurable but hard-wired into the |
| 1510 | * library. The following is the floating point variant. |
| 1511 | */ |
| 1512 | #define PNG_GAMMA_THRESHOLD (PNG_GAMMA_THRESHOLD_FIXED*.00001) |
| 1513 | |
John Bowler | d273ad2 | 2011-05-07 21:00:28 -0500 | [diff] [blame] | 1514 | /* Handle gamma correction. Screen_gamma=(display_exponent). |
Glenn Randers-Pehrson | c782251 | 2011-05-07 21:23:43 -0500 | [diff] [blame] | 1515 | * NOTE: this API simply sets the screen and file gamma values. It will |
John Bowler | d273ad2 | 2011-05-07 21:00:28 -0500 | [diff] [blame] | 1516 | * therefore override the value for gamma in a PNG file if it is called after |
John Bowler | f70c7d0 | 2011-05-10 22:54:37 -0500 | [diff] [blame] | 1517 | * the file header has been read - use with care - call before reading the PNG |
| 1518 | * file for best results! |
| 1519 | * |
| 1520 | * These routines accept the same gamma values as png_set_alpha_mode (described |
| 1521 | * above). The PNG_GAMMA_ defines and PNG_DEFAULT_sRGB can be passed to either |
| 1522 | * API (floating point or fixed.) Notice, however, that the 'file_gamma' value |
| 1523 | * is the inverse of a 'screen gamma' value. |
John Bowler | d273ad2 | 2011-05-07 21:00:28 -0500 | [diff] [blame] | 1524 | */ |
John Bowler | 5d56786 | 2011-12-24 09:12:00 -0600 | [diff] [blame] | 1525 | PNG_FP_EXPORT(50, void, png_set_gamma, (png_structrp png_ptr, |
Glenn Randers-Pehrson | 871b1d0 | 2013-03-02 14:58:22 -0600 | [diff] [blame] | 1526 | double screen_gamma, double override_file_gamma)) |
John Bowler | 5d56786 | 2011-12-24 09:12:00 -0600 | [diff] [blame] | 1527 | PNG_FIXED_EXPORT(208, void, png_set_gamma_fixed, (png_structrp png_ptr, |
Glenn Randers-Pehrson | 871b1d0 | 2013-03-02 14:58:22 -0600 | [diff] [blame] | 1528 | png_fixed_point screen_gamma, png_fixed_point override_file_gamma)) |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame] | 1529 | #endif |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 1530 | |
Glenn Randers-Pehrson | 4e6b5e9 | 2009-09-23 10:24:53 -0500 | [diff] [blame] | 1531 | #ifdef PNG_WRITE_FLUSH_SUPPORTED |
Guy Schalnat | 0f71645 | 1995-11-28 11:22:13 -0600 | [diff] [blame] | 1532 | /* Set how many lines between output flushes - 0 for no flushing */ |
John Bowler | 5d56786 | 2011-12-24 09:12:00 -0600 | [diff] [blame] | 1533 | PNG_EXPORT(51, void, png_set_flush, (png_structrp png_ptr, int nrows)); |
Guy Schalnat | 0f71645 | 1995-11-28 11:22:13 -0600 | [diff] [blame] | 1534 | /* Flush the current PNG output buffer */ |
John Bowler | 5d56786 | 2011-12-24 09:12:00 -0600 | [diff] [blame] | 1535 | PNG_EXPORT(52, void, png_write_flush, (png_structrp png_ptr)); |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame] | 1536 | #endif |
Guy Schalnat | 0f71645 | 1995-11-28 11:22:13 -0600 | [diff] [blame] | 1537 | |
Glenn Randers-Pehrson | 6c7a09a | 2009-06-15 21:57:39 -0500 | [diff] [blame] | 1538 | /* Optional update palette with requested transformations */ |
John Bowler | 5d56786 | 2011-12-24 09:12:00 -0600 | [diff] [blame] | 1539 | PNG_EXPORT(53, void, png_start_read_image, (png_structrp png_ptr)); |
Guy Schalnat | 51f0eb4 | 1995-09-26 05:22:39 -0500 | [diff] [blame] | 1540 | |
Glenn Randers-Pehrson | 6c7a09a | 2009-06-15 21:57:39 -0500 | [diff] [blame] | 1541 | /* Optional call to update the users info structure */ |
John Bowler | 5d56786 | 2011-12-24 09:12:00 -0600 | [diff] [blame] | 1542 | PNG_EXPORT(54, void, png_read_update_info, (png_structrp png_ptr, |
| 1543 | png_inforp info_ptr)); |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 1544 | |
Glenn Randers-Pehrson | dbd4014 | 2009-08-31 08:42:02 -0500 | [diff] [blame] | 1545 | #ifdef PNG_SEQUENTIAL_READ_SUPPORTED |
Glenn Randers-Pehrson | 6c7a09a | 2009-06-15 21:57:39 -0500 | [diff] [blame] | 1546 | /* Read one or more rows of image data. */ |
John Bowler | 5d56786 | 2011-12-24 09:12:00 -0600 | [diff] [blame] | 1547 | PNG_EXPORT(55, void, png_read_rows, (png_structrp png_ptr, png_bytepp row, |
Glenn Randers-Pehrson | 23d3970 | 2010-12-06 18:28:02 -0600 | [diff] [blame] | 1548 | png_bytepp display_row, png_uint_32 num_rows)); |
Glenn Randers-Pehrson | 5fea36f | 2004-07-28 08:20:44 -0500 | [diff] [blame] | 1549 | #endif |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 1550 | |
Glenn Randers-Pehrson | dbd4014 | 2009-08-31 08:42:02 -0500 | [diff] [blame] | 1551 | #ifdef PNG_SEQUENTIAL_READ_SUPPORTED |
Glenn Randers-Pehrson | 6c7a09a | 2009-06-15 21:57:39 -0500 | [diff] [blame] | 1552 | /* Read a row of data. */ |
John Bowler | 5d56786 | 2011-12-24 09:12:00 -0600 | [diff] [blame] | 1553 | PNG_EXPORT(56, void, png_read_row, (png_structrp png_ptr, png_bytep row, |
Glenn Randers-Pehrson | 23d3970 | 2010-12-06 18:28:02 -0600 | [diff] [blame] | 1554 | png_bytep display_row)); |
Glenn Randers-Pehrson | 5fea36f | 2004-07-28 08:20:44 -0500 | [diff] [blame] | 1555 | #endif |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 1556 | |
Glenn Randers-Pehrson | dbd4014 | 2009-08-31 08:42:02 -0500 | [diff] [blame] | 1557 | #ifdef PNG_SEQUENTIAL_READ_SUPPORTED |
Glenn Randers-Pehrson | 6c7a09a | 2009-06-15 21:57:39 -0500 | [diff] [blame] | 1558 | /* Read the whole image into memory at once. */ |
John Bowler | 5d56786 | 2011-12-24 09:12:00 -0600 | [diff] [blame] | 1559 | PNG_EXPORT(57, void, png_read_image, (png_structrp png_ptr, png_bytepp image)); |
Glenn Randers-Pehrson | 5fea36f | 2004-07-28 08:20:44 -0500 | [diff] [blame] | 1560 | #endif |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 1561 | |
Glenn Randers-Pehrson | 6c7a09a | 2009-06-15 21:57:39 -0500 | [diff] [blame] | 1562 | /* Write a row of image data */ |
Glenn Randers-Pehrson | 871b1d0 | 2013-03-02 14:58:22 -0600 | [diff] [blame] | 1563 | PNG_EXPORT(58, void, png_write_row, (png_structrp png_ptr, |
| 1564 | png_const_bytep row)); |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 1565 | |
Glenn Randers-Pehrson | 9f044c1 | 2010-12-07 14:59:43 -0600 | [diff] [blame] | 1566 | /* Write a few rows of image data: (*row) is not written; however, the type |
| 1567 | * is declared as writeable to maintain compatibility with previous versions |
| 1568 | * of libpng and to allow the 'display_row' array from read_rows to be passed |
Glenn Randers-Pehrson | e600c51 | 2010-08-18 07:25:46 -0500 | [diff] [blame] | 1569 | * unchanged to write_rows. |
| 1570 | */ |
John Bowler | 5d56786 | 2011-12-24 09:12:00 -0600 | [diff] [blame] | 1571 | PNG_EXPORT(59, void, png_write_rows, (png_structrp png_ptr, png_bytepp row, |
Glenn Randers-Pehrson | 23d3970 | 2010-12-06 18:28:02 -0600 | [diff] [blame] | 1572 | png_uint_32 num_rows)); |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 1573 | |
Glenn Randers-Pehrson | 6c7a09a | 2009-06-15 21:57:39 -0500 | [diff] [blame] | 1574 | /* Write the image data */ |
John Bowler | 5d56786 | 2011-12-24 09:12:00 -0600 | [diff] [blame] | 1575 | PNG_EXPORT(60, void, png_write_image, (png_structrp png_ptr, png_bytepp image)); |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 1576 | |
Glenn Randers-Pehrson | 6c7a09a | 2009-06-15 21:57:39 -0500 | [diff] [blame] | 1577 | /* Write the end of the PNG file. */ |
Glenn Randers-Pehrson | 871b1d0 | 2013-03-02 14:58:22 -0600 | [diff] [blame] | 1578 | PNG_EXPORT(61, void, png_write_end, (png_structrp png_ptr, |
| 1579 | png_inforp info_ptr)); |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 1580 | |
Glenn Randers-Pehrson | dbd4014 | 2009-08-31 08:42:02 -0500 | [diff] [blame] | 1581 | #ifdef PNG_SEQUENTIAL_READ_SUPPORTED |
Glenn Randers-Pehrson | 6c7a09a | 2009-06-15 21:57:39 -0500 | [diff] [blame] | 1582 | /* Read the end of the PNG file. */ |
John Bowler | 5d56786 | 2011-12-24 09:12:00 -0600 | [diff] [blame] | 1583 | PNG_EXPORT(62, void, png_read_end, (png_structrp png_ptr, png_inforp info_ptr)); |
Glenn Randers-Pehrson | 5fea36f | 2004-07-28 08:20:44 -0500 | [diff] [blame] | 1584 | #endif |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 1585 | |
Glenn Randers-Pehrson | 6c7a09a | 2009-06-15 21:57:39 -0500 | [diff] [blame] | 1586 | /* Free any memory associated with the png_info_struct */ |
John Bowler | 5d56786 | 2011-12-24 09:12:00 -0600 | [diff] [blame] | 1587 | PNG_EXPORT(63, void, png_destroy_info_struct, (png_const_structrp png_ptr, |
Glenn Randers-Pehrson | 23d3970 | 2010-12-06 18:28:02 -0600 | [diff] [blame] | 1588 | png_infopp info_ptr_ptr)); |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 1589 | |
Glenn Randers-Pehrson | 6c7a09a | 2009-06-15 21:57:39 -0500 | [diff] [blame] | 1590 | /* Free any memory associated with the png_struct and the png_info_structs */ |
Glenn Randers-Pehrson | c36bb79 | 2011-02-12 09:49:07 -0600 | [diff] [blame] | 1591 | PNG_EXPORT(64, void, png_destroy_read_struct, (png_structpp png_ptr_ptr, |
Glenn Randers-Pehrson | 23d3970 | 2010-12-06 18:28:02 -0600 | [diff] [blame] | 1592 | png_infopp info_ptr_ptr, png_infopp end_info_ptr_ptr)); |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 1593 | |
Glenn Randers-Pehrson | 6c7a09a | 2009-06-15 21:57:39 -0500 | [diff] [blame] | 1594 | /* Free any memory associated with the png_struct and the png_info_structs */ |
Glenn Randers-Pehrson | c36bb79 | 2011-02-12 09:49:07 -0600 | [diff] [blame] | 1595 | PNG_EXPORT(65, void, png_destroy_write_struct, (png_structpp png_ptr_ptr, |
Glenn Randers-Pehrson | 23d3970 | 2010-12-06 18:28:02 -0600 | [diff] [blame] | 1596 | png_infopp info_ptr_ptr)); |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 1597 | |
Glenn Randers-Pehrson | 6c7a09a | 2009-06-15 21:57:39 -0500 | [diff] [blame] | 1598 | /* Set the libpng method of handling chunk CRC errors */ |
John Bowler | 5d56786 | 2011-12-24 09:12:00 -0600 | [diff] [blame] | 1599 | PNG_EXPORT(66, void, png_set_crc_action, (png_structrp png_ptr, int crit_action, |
John Bowler | 40b2603 | 2011-12-22 08:09:15 -0600 | [diff] [blame] | 1600 | int ancil_action)); |
Andreas Dilger | 02ad0ef | 1997-01-17 01:34:35 -0600 | [diff] [blame] | 1601 | |
Glenn Randers-Pehrson | 9f044c1 | 2010-12-07 14:59:43 -0600 | [diff] [blame] | 1602 | /* Values for png_set_crc_action() say how to handle CRC errors in |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 1603 | * ancillary and critical chunks, and whether to use the data contained |
| 1604 | * therein. Note that it is impossible to "discard" data in a critical |
Glenn Randers-Pehrson | c36bb79 | 2011-02-12 09:49:07 -0600 | [diff] [blame] | 1605 | * chunk. For versions prior to 0.90, the action was always error/quit, |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 1606 | * whereas in version 0.90 and later, the action for CRC errors in ancillary |
| 1607 | * chunks is warn/discard. These values should NOT be changed. |
| 1608 | * |
| 1609 | * value action:critical action:ancillary |
Andreas Dilger | 02ad0ef | 1997-01-17 01:34:35 -0600 | [diff] [blame] | 1610 | */ |
| 1611 | #define PNG_CRC_DEFAULT 0 /* error/quit warn/discard data */ |
| 1612 | #define PNG_CRC_ERROR_QUIT 1 /* error/quit error/quit */ |
| 1613 | #define PNG_CRC_WARN_DISCARD 2 /* (INVALID) warn/discard data */ |
| 1614 | #define PNG_CRC_WARN_USE 3 /* warn/use data warn/use data */ |
| 1615 | #define PNG_CRC_QUIET_USE 4 /* quiet/use data quiet/use data */ |
| 1616 | #define PNG_CRC_NO_CHANGE 5 /* use current value use current value */ |
| 1617 | |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 1618 | /* These functions give the user control over the scan-line filtering in |
| 1619 | * libpng and the compression methods used by zlib. These functions are |
| 1620 | * mainly useful for testing, as the defaults should work with most users. |
| 1621 | * Those users who are tight on memory or want faster performance at the |
| 1622 | * expense of compression can modify them. See the compression library |
Glenn Randers-Pehrson | b6ce43d | 1998-01-01 07:13:13 -0600 | [diff] [blame] | 1623 | * header file (zlib.h) for an explination of the compression functions. |
| 1624 | */ |
Andreas Dilger | 02ad0ef | 1997-01-17 01:34:35 -0600 | [diff] [blame] | 1625 | |
Glenn Randers-Pehrson | 6c7a09a | 2009-06-15 21:57:39 -0500 | [diff] [blame] | 1626 | /* 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] | 1627 | * value for "method" is 0. |
| 1628 | */ |
John Bowler | 5d56786 | 2011-12-24 09:12:00 -0600 | [diff] [blame] | 1629 | PNG_EXPORT(67, void, png_set_filter, (png_structrp png_ptr, int method, |
John Bowler | 40b2603 | 2011-12-22 08:09:15 -0600 | [diff] [blame] | 1630 | int filters)); |
Guy Schalnat | 51f0eb4 | 1995-09-26 05:22:39 -0500 | [diff] [blame] | 1631 | |
Andreas Dilger | 02ad0ef | 1997-01-17 01:34:35 -0600 | [diff] [blame] | 1632 | /* 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] | 1633 | * are chosen so that they don't conflict with real filter types |
| 1634 | * below, in case they are supplied instead of the #defined constants. |
| 1635 | * These values should NOT be changed. |
Andreas Dilger | 02ad0ef | 1997-01-17 01:34:35 -0600 | [diff] [blame] | 1636 | */ |
| 1637 | #define PNG_NO_FILTERS 0x00 |
| 1638 | #define PNG_FILTER_NONE 0x08 |
| 1639 | #define PNG_FILTER_SUB 0x10 |
| 1640 | #define PNG_FILTER_UP 0x20 |
| 1641 | #define PNG_FILTER_AVG 0x40 |
| 1642 | #define PNG_FILTER_PAETH 0x80 |
| 1643 | #define PNG_ALL_FILTERS (PNG_FILTER_NONE | PNG_FILTER_SUB | PNG_FILTER_UP | \ |
| 1644 | PNG_FILTER_AVG | PNG_FILTER_PAETH) |
| 1645 | |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 1646 | /* Filter values (not flags) - used in pngwrite.c, pngwutil.c for now. |
| 1647 | * These defines should NOT be changed. |
| 1648 | */ |
| 1649 | #define PNG_FILTER_VALUE_NONE 0 |
| 1650 | #define PNG_FILTER_VALUE_SUB 1 |
| 1651 | #define PNG_FILTER_VALUE_UP 2 |
| 1652 | #define PNG_FILTER_VALUE_AVG 3 |
| 1653 | #define PNG_FILTER_VALUE_PAETH 4 |
| 1654 | #define PNG_FILTER_VALUE_LAST 5 |
| 1655 | |
Glenn Randers-Pehrson | 4e6b5e9 | 2009-09-23 10:24:53 -0500 | [diff] [blame] | 1656 | #ifdef PNG_WRITE_WEIGHTED_FILTER_SUPPORTED /* EXPERIMENTAL */ |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 1657 | /* The "heuristic_method" is given by one of the PNG_FILTER_HEURISTIC_ |
| 1658 | * defines, either the default (minimum-sum-of-absolute-differences), or |
| 1659 | * the experimental method (weighted-minimum-sum-of-absolute-differences). |
| 1660 | * |
| 1661 | * Weights are factors >= 1.0, indicating how important it is to keep the |
| 1662 | * filter type consistent between rows. Larger numbers mean the current |
| 1663 | * filter is that many times as likely to be the same as the "num_weights" |
| 1664 | * previous filters. This is cumulative for each previous row with a weight. |
| 1665 | * There needs to be "num_weights" values in "filter_weights", or it can be |
| 1666 | * NULL if the weights aren't being specified. Weights have no influence on |
| 1667 | * the selection of the first row filter. Well chosen weights can (in theory) |
| 1668 | * improve the compression for a given image. |
| 1669 | * |
| 1670 | * Costs are factors >= 1.0 indicating the relative decoding costs of a |
| 1671 | * filter type. Higher costs indicate more decoding expense, and are |
| 1672 | * therefore less likely to be selected over a filter with lower computational |
| 1673 | * costs. There needs to be a value in "filter_costs" for each valid filter |
| 1674 | * type (given by PNG_FILTER_VALUE_LAST), or it can be NULL if you aren't |
| 1675 | * setting the costs. Costs try to improve the speed of decompression without |
| 1676 | * unduly increasing the compressed image size. |
| 1677 | * |
| 1678 | * A negative weight or cost indicates the default value is to be used, and |
| 1679 | * values in the range [0.0, 1.0) indicate the value is to remain unchanged. |
| 1680 | * The default values for both weights and costs are currently 1.0, but may |
| 1681 | * change if good general weighting/cost heuristics can be found. If both |
| 1682 | * the weights and costs are set to 1.0, this degenerates the WEIGHTED method |
| 1683 | * to the UNWEIGHTED method, but with added encoding time/computation. |
| 1684 | */ |
John Bowler | 5d56786 | 2011-12-24 09:12:00 -0600 | [diff] [blame] | 1685 | PNG_FP_EXPORT(68, void, png_set_filter_heuristics, (png_structrp png_ptr, |
Glenn Randers-Pehrson | c36bb79 | 2011-02-12 09:49:07 -0600 | [diff] [blame] | 1686 | int heuristic_method, int num_weights, png_const_doublep filter_weights, |
Glenn Randers-Pehrson | 871b1d0 | 2013-03-02 14:58:22 -0600 | [diff] [blame] | 1687 | png_const_doublep filter_costs)) |
Glenn Randers-Pehrson | 23d3970 | 2010-12-06 18:28:02 -0600 | [diff] [blame] | 1688 | PNG_FIXED_EXPORT(209, void, png_set_filter_heuristics_fixed, |
John Bowler | 5d56786 | 2011-12-24 09:12:00 -0600 | [diff] [blame] | 1689 | (png_structrp png_ptr, int heuristic_method, int num_weights, |
John Bowler | 40b2603 | 2011-12-22 08:09:15 -0600 | [diff] [blame] | 1690 | png_const_fixed_point_p filter_weights, |
Glenn Randers-Pehrson | 871b1d0 | 2013-03-02 14:58:22 -0600 | [diff] [blame] | 1691 | png_const_fixed_point_p filter_costs)) |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 1692 | #endif /* PNG_WRITE_WEIGHTED_FILTER_SUPPORTED */ |
| 1693 | |
| 1694 | /* Heuristic used for row filter selection. These defines should NOT be |
| 1695 | * changed. |
| 1696 | */ |
| 1697 | #define PNG_FILTER_HEURISTIC_DEFAULT 0 /* Currently "UNWEIGHTED" */ |
| 1698 | #define PNG_FILTER_HEURISTIC_UNWEIGHTED 1 /* Used by libpng < 0.95 */ |
| 1699 | #define PNG_FILTER_HEURISTIC_WEIGHTED 2 /* Experimental feature */ |
| 1700 | #define PNG_FILTER_HEURISTIC_LAST 3 /* Not a valid value */ |
| 1701 | |
John Bowler | c5bef94 | 2011-05-05 17:35:39 -0500 | [diff] [blame] | 1702 | #ifdef PNG_WRITE_SUPPORTED |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 1703 | /* Set the library compression level. Currently, valid values range from |
| 1704 | * 0 - 9, corresponding directly to the zlib compression levels 0 - 9 |
| 1705 | * (0 - no compression, 9 - "maximal" compression). Note that tests have |
| 1706 | * shown that zlib compression levels 3-6 usually perform as well as level 9 |
Glenn Randers-Pehrson | c36bb79 | 2011-02-12 09:49:07 -0600 | [diff] [blame] | 1707 | * for PNG images, and do considerably fewer caclulations. In the future, |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 1708 | * these values may not correspond directly to the zlib compression levels. |
| 1709 | */ |
John Bowler | 5d56786 | 2011-12-24 09:12:00 -0600 | [diff] [blame] | 1710 | PNG_EXPORT(69, void, png_set_compression_level, (png_structrp png_ptr, |
John Bowler | 40b2603 | 2011-12-22 08:09:15 -0600 | [diff] [blame] | 1711 | int level)); |
Guy Schalnat | 51f0eb4 | 1995-09-26 05:22:39 -0500 | [diff] [blame] | 1712 | |
John Bowler | 5d56786 | 2011-12-24 09:12:00 -0600 | [diff] [blame] | 1713 | PNG_EXPORT(70, void, png_set_compression_mem_level, (png_structrp png_ptr, |
Glenn Randers-Pehrson | 23d3970 | 2010-12-06 18:28:02 -0600 | [diff] [blame] | 1714 | int mem_level)); |
Guy Schalnat | 51f0eb4 | 1995-09-26 05:22:39 -0500 | [diff] [blame] | 1715 | |
John Bowler | 5d56786 | 2011-12-24 09:12:00 -0600 | [diff] [blame] | 1716 | PNG_EXPORT(71, void, png_set_compression_strategy, (png_structrp png_ptr, |
Glenn Randers-Pehrson | 23d3970 | 2010-12-06 18:28:02 -0600 | [diff] [blame] | 1717 | int strategy)); |
Guy Schalnat | 51f0eb4 | 1995-09-26 05:22:39 -0500 | [diff] [blame] | 1718 | |
Glenn Randers-Pehrson | af855e4 | 2011-05-07 10:52:49 -0500 | [diff] [blame] | 1719 | /* If PNG_WRITE_OPTIMIZE_CMF_SUPPORTED is defined, libpng will use a |
| 1720 | * smaller value of window_bits if it can do so safely. |
| 1721 | */ |
John Bowler | 5d56786 | 2011-12-24 09:12:00 -0600 | [diff] [blame] | 1722 | PNG_EXPORT(72, void, png_set_compression_window_bits, (png_structrp png_ptr, |
Glenn Randers-Pehrson | 23d3970 | 2010-12-06 18:28:02 -0600 | [diff] [blame] | 1723 | int window_bits)); |
Guy Schalnat | 51f0eb4 | 1995-09-26 05:22:39 -0500 | [diff] [blame] | 1724 | |
John Bowler | 5d56786 | 2011-12-24 09:12:00 -0600 | [diff] [blame] | 1725 | PNG_EXPORT(73, void, png_set_compression_method, (png_structrp png_ptr, |
Glenn Randers-Pehrson | 23d3970 | 2010-12-06 18:28:02 -0600 | [diff] [blame] | 1726 | int method)); |
John Bowler | c5bef94 | 2011-05-05 17:35:39 -0500 | [diff] [blame] | 1727 | #endif |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 1728 | |
John Bowler | b2bee33 | 2011-06-10 23:24:58 -0500 | [diff] [blame] | 1729 | #ifdef PNG_WRITE_CUSTOMIZE_ZTXT_COMPRESSION_SUPPORTED |
Glenn Randers-Pehrson | 6b3d50b | 2011-03-31 20:14:29 -0500 | [diff] [blame] | 1730 | /* Also set zlib parameters for compressing non-IDAT chunks */ |
John Bowler | 5d56786 | 2011-12-24 09:12:00 -0600 | [diff] [blame] | 1731 | PNG_EXPORT(222, void, png_set_text_compression_level, (png_structrp png_ptr, |
John Bowler | 40b2603 | 2011-12-22 08:09:15 -0600 | [diff] [blame] | 1732 | int level)); |
Glenn Randers-Pehrson | 6b3d50b | 2011-03-31 20:14:29 -0500 | [diff] [blame] | 1733 | |
John Bowler | 5d56786 | 2011-12-24 09:12:00 -0600 | [diff] [blame] | 1734 | PNG_EXPORT(223, void, png_set_text_compression_mem_level, (png_structrp png_ptr, |
Glenn Randers-Pehrson | 6b3d50b | 2011-03-31 20:14:29 -0500 | [diff] [blame] | 1735 | int mem_level)); |
| 1736 | |
John Bowler | 5d56786 | 2011-12-24 09:12:00 -0600 | [diff] [blame] | 1737 | PNG_EXPORT(224, void, png_set_text_compression_strategy, (png_structrp png_ptr, |
Glenn Randers-Pehrson | 6b3d50b | 2011-03-31 20:14:29 -0500 | [diff] [blame] | 1738 | int strategy)); |
| 1739 | |
Glenn Randers-Pehrson | af855e4 | 2011-05-07 10:52:49 -0500 | [diff] [blame] | 1740 | /* If PNG_WRITE_OPTIMIZE_CMF_SUPPORTED is defined, libpng will use a |
| 1741 | * smaller value of window_bits if it can do so safely. |
| 1742 | */ |
John Bowler | 40b2603 | 2011-12-22 08:09:15 -0600 | [diff] [blame] | 1743 | PNG_EXPORT(225, void, png_set_text_compression_window_bits, |
John Bowler | 5d56786 | 2011-12-24 09:12:00 -0600 | [diff] [blame] | 1744 | (png_structrp png_ptr, int window_bits)); |
Glenn Randers-Pehrson | 6b3d50b | 2011-03-31 20:14:29 -0500 | [diff] [blame] | 1745 | |
John Bowler | 5d56786 | 2011-12-24 09:12:00 -0600 | [diff] [blame] | 1746 | PNG_EXPORT(226, void, png_set_text_compression_method, (png_structrp png_ptr, |
Glenn Randers-Pehrson | 6b3d50b | 2011-03-31 20:14:29 -0500 | [diff] [blame] | 1747 | int method)); |
John Bowler | b2bee33 | 2011-06-10 23:24:58 -0500 | [diff] [blame] | 1748 | #endif /* PNG_WRITE_CUSTOMIZE_ZTXT_COMPRESSION_SUPPORTED */ |
Glenn Randers-Pehrson | 6b3d50b | 2011-03-31 20:14:29 -0500 | [diff] [blame] | 1749 | |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 1750 | /* These next functions are called for input/output, memory, and error |
Glenn Randers-Pehrson | c36bb79 | 2011-02-12 09:49:07 -0600 | [diff] [blame] | 1751 | * handling. They are in the file pngrio.c, pngwio.c, and pngerror.c, |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 1752 | * and call standard C I/O routines such as fread(), fwrite(), and |
| 1753 | * fprintf(). These functions can be made to use other I/O routines |
| 1754 | * at run time for those applications that need to handle I/O in a |
Glenn Randers-Pehrson | f3abb2c | 2010-10-17 12:51:53 -0500 | [diff] [blame] | 1755 | * different manner by calling png_set_???_fn(). See libpng-manual.txt for |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 1756 | * more information. |
| 1757 | */ |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 1758 | |
Glenn Randers-Pehrson | dbd4014 | 2009-08-31 08:42:02 -0500 | [diff] [blame] | 1759 | #ifdef PNG_STDIO_SUPPORTED |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 1760 | /* Initialize the input/output for the PNG file to the default functions. */ |
John Bowler | 5d56786 | 2011-12-24 09:12:00 -0600 | [diff] [blame] | 1761 | PNG_EXPORT(74, void, png_init_io, (png_structrp png_ptr, png_FILE_p fp)); |
Glenn Randers-Pehrson | 70e3f54 | 1998-01-03 22:40:55 -0600 | [diff] [blame] | 1762 | #endif |
Guy Schalnat | 6d76471 | 1995-12-19 03:22:19 -0600 | [diff] [blame] | 1763 | |
Andreas Dilger | 02ad0ef | 1997-01-17 01:34:35 -0600 | [diff] [blame] | 1764 | /* Replace the (error and abort), and warning functions with user |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 1765 | * supplied functions. If no messages are to be printed you must still |
| 1766 | * write and use replacement functions. The replacement error_fn should |
| 1767 | * still do a longjmp to the last setjmp location if you are using this |
| 1768 | * method of error handling. If error_fn or warning_fn is NULL, the |
| 1769 | * default function will be used. |
| 1770 | */ |
Glenn Randers-Pehrson | 5c6aeb2 | 1998-12-29 11:47:59 -0600 | [diff] [blame] | 1771 | |
John Bowler | 5d56786 | 2011-12-24 09:12:00 -0600 | [diff] [blame] | 1772 | PNG_EXPORT(75, void, png_set_error_fn, (png_structrp png_ptr, |
John Bowler | 40b2603 | 2011-12-22 08:09:15 -0600 | [diff] [blame] | 1773 | 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] | 1774 | |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 1775 | /* Return the user pointer associated with the error functions */ |
John Bowler | 5d56786 | 2011-12-24 09:12:00 -0600 | [diff] [blame] | 1776 | PNG_EXPORT(76, png_voidp, png_get_error_ptr, (png_const_structrp png_ptr)); |
Guy Schalnat | 6d76471 | 1995-12-19 03:22:19 -0600 | [diff] [blame] | 1777 | |
| 1778 | /* Replace the default data output functions with a user supplied one(s). |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 1779 | * If buffered output is not used, then output_flush_fn can be set to NULL. |
| 1780 | * If PNG_WRITE_FLUSH_SUPPORTED is not defined at libpng compile time |
| 1781 | * output_flush_fn will be ignored (and thus can be NULL). |
Glenn Randers-Pehrson | 8fb550c | 2009-03-21 08:15:32 -0500 | [diff] [blame] | 1782 | * It is probably a mistake to use NULL for output_flush_fn if |
| 1783 | * write_data_fn is not also NULL unless you have built libpng with |
| 1784 | * PNG_WRITE_FLUSH_SUPPORTED undefined, because in this case libpng's |
| 1785 | * default flush function, which uses the standard *FILE structure, will |
| 1786 | * be used. |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 1787 | */ |
John Bowler | 5d56786 | 2011-12-24 09:12:00 -0600 | [diff] [blame] | 1788 | PNG_EXPORT(77, void, png_set_write_fn, (png_structrp png_ptr, png_voidp io_ptr, |
Glenn Randers-Pehrson | 23d3970 | 2010-12-06 18:28:02 -0600 | [diff] [blame] | 1789 | png_rw_ptr write_data_fn, png_flush_ptr output_flush_fn)); |
Guy Schalnat | 6d76471 | 1995-12-19 03:22:19 -0600 | [diff] [blame] | 1790 | |
| 1791 | /* Replace the default data input function with a user supplied one. */ |
John Bowler | 5d56786 | 2011-12-24 09:12:00 -0600 | [diff] [blame] | 1792 | PNG_EXPORT(78, void, png_set_read_fn, (png_structrp png_ptr, png_voidp io_ptr, |
Glenn Randers-Pehrson | 23d3970 | 2010-12-06 18:28:02 -0600 | [diff] [blame] | 1793 | png_rw_ptr read_data_fn)); |
Guy Schalnat | 6d76471 | 1995-12-19 03:22:19 -0600 | [diff] [blame] | 1794 | |
| 1795 | /* Return the user pointer associated with the I/O functions */ |
John Bowler | 5d56786 | 2011-12-24 09:12:00 -0600 | [diff] [blame] | 1796 | PNG_EXPORT(79, png_voidp, png_get_io_ptr, (png_const_structrp png_ptr)); |
Guy Schalnat | 6d76471 | 1995-12-19 03:22:19 -0600 | [diff] [blame] | 1797 | |
John Bowler | 5d56786 | 2011-12-24 09:12:00 -0600 | [diff] [blame] | 1798 | PNG_EXPORT(80, void, png_set_read_status_fn, (png_structrp png_ptr, |
Glenn Randers-Pehrson | 23d3970 | 2010-12-06 18:28:02 -0600 | [diff] [blame] | 1799 | png_read_status_ptr read_row_fn)); |
Glenn Randers-Pehrson | 08a3343 | 1998-03-07 06:06:55 -0600 | [diff] [blame] | 1800 | |
John Bowler | 5d56786 | 2011-12-24 09:12:00 -0600 | [diff] [blame] | 1801 | PNG_EXPORT(81, void, png_set_write_status_fn, (png_structrp png_ptr, |
Glenn Randers-Pehrson | 23d3970 | 2010-12-06 18:28:02 -0600 | [diff] [blame] | 1802 | png_write_status_ptr write_row_fn)); |
Glenn Randers-Pehrson | 08a3343 | 1998-03-07 06:06:55 -0600 | [diff] [blame] | 1803 | |
Glenn Randers-Pehrson | f7d1a17 | 1998-06-06 15:31:35 -0500 | [diff] [blame] | 1804 | #ifdef PNG_USER_MEM_SUPPORTED |
| 1805 | /* Replace the default memory allocation functions with user supplied one(s). */ |
John Bowler | 5d56786 | 2011-12-24 09:12:00 -0600 | [diff] [blame] | 1806 | PNG_EXPORT(82, void, png_set_mem_fn, (png_structrp png_ptr, png_voidp mem_ptr, |
Glenn Randers-Pehrson | 23d3970 | 2010-12-06 18:28:02 -0600 | [diff] [blame] | 1807 | png_malloc_ptr malloc_fn, png_free_ptr free_fn)); |
Glenn Randers-Pehrson | f7d1a17 | 1998-06-06 15:31:35 -0500 | [diff] [blame] | 1808 | /* Return the user pointer associated with the memory functions */ |
John Bowler | 5d56786 | 2011-12-24 09:12:00 -0600 | [diff] [blame] | 1809 | PNG_EXPORT(83, png_voidp, png_get_mem_ptr, (png_const_structrp png_ptr)); |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame] | 1810 | #endif |
Glenn Randers-Pehrson | f7d1a17 | 1998-06-06 15:31:35 -0500 | [diff] [blame] | 1811 | |
Glenn Randers-Pehrson | 33188ac | 2009-06-16 14:12:35 -0500 | [diff] [blame] | 1812 | #ifdef PNG_READ_USER_TRANSFORM_SUPPORTED |
John Bowler | 5d56786 | 2011-12-24 09:12:00 -0600 | [diff] [blame] | 1813 | PNG_EXPORT(84, void, png_set_read_user_transform_fn, (png_structrp png_ptr, |
Glenn Randers-Pehrson | 23d3970 | 2010-12-06 18:28:02 -0600 | [diff] [blame] | 1814 | png_user_transform_ptr read_user_transform_fn)); |
Glenn Randers-Pehrson | 08a3343 | 1998-03-07 06:06:55 -0600 | [diff] [blame] | 1815 | #endif |
| 1816 | |
Glenn Randers-Pehrson | 33188ac | 2009-06-16 14:12:35 -0500 | [diff] [blame] | 1817 | #ifdef PNG_WRITE_USER_TRANSFORM_SUPPORTED |
John Bowler | 5d56786 | 2011-12-24 09:12:00 -0600 | [diff] [blame] | 1818 | PNG_EXPORT(85, void, png_set_write_user_transform_fn, (png_structrp png_ptr, |
Glenn Randers-Pehrson | 23d3970 | 2010-12-06 18:28:02 -0600 | [diff] [blame] | 1819 | png_user_transform_ptr write_user_transform_fn)); |
Glenn Randers-Pehrson | 08a3343 | 1998-03-07 06:06:55 -0600 | [diff] [blame] | 1820 | #endif |
| 1821 | |
John Bowler | 0a5c9c0 | 2011-01-22 17:36:34 -0600 | [diff] [blame] | 1822 | #ifdef PNG_USER_TRANSFORM_PTR_SUPPORTED |
John Bowler | 5d56786 | 2011-12-24 09:12:00 -0600 | [diff] [blame] | 1823 | PNG_EXPORT(86, void, png_set_user_transform_info, (png_structrp png_ptr, |
Glenn Randers-Pehrson | c36bb79 | 2011-02-12 09:49:07 -0600 | [diff] [blame] | 1824 | png_voidp user_transform_ptr, int user_transform_depth, |
Glenn Randers-Pehrson | 23d3970 | 2010-12-06 18:28:02 -0600 | [diff] [blame] | 1825 | int user_transform_channels)); |
Glenn Randers-Pehrson | 4393a9a | 1999-09-17 12:27:26 -0500 | [diff] [blame] | 1826 | /* Return the user pointer associated with the user transform functions */ |
Glenn Randers-Pehrson | b86b492 | 2011-01-21 23:12:51 -0600 | [diff] [blame] | 1827 | PNG_EXPORT(87, png_voidp, png_get_user_transform_ptr, |
John Bowler | 5d56786 | 2011-12-24 09:12:00 -0600 | [diff] [blame] | 1828 | (png_const_structrp png_ptr)); |
John Bowler | 0a5c9c0 | 2011-01-22 17:36:34 -0600 | [diff] [blame] | 1829 | #endif |
| 1830 | |
| 1831 | #ifdef PNG_USER_TRANSFORM_INFO_SUPPORTED |
| 1832 | /* Return information about the row currently being processed. Note that these |
| 1833 | * APIs do not fail but will return unexpected results if called outside a user |
| 1834 | * transform callback. Also note that when transforming an interlaced image the |
John Bowler | 9616ad9 | 2011-02-16 06:13:46 -0600 | [diff] [blame] | 1835 | * row number is the row number within the sub-image of the interlace pass, so |
| 1836 | * the value will increase to the height of the sub-image (not the full image) |
| 1837 | * then reset to 0 for the next pass. |
John Bowler | 5432c01 | 2011-02-12 08:59:17 -0600 | [diff] [blame] | 1838 | * |
John Bowler | 9616ad9 | 2011-02-16 06:13:46 -0600 | [diff] [blame] | 1839 | * Use PNG_ROW_FROM_PASS_ROW(row, pass) and PNG_COL_FROM_PASS_COL(col, pass) to |
| 1840 | * find the output pixel (x,y) given an interlaced sub-image pixel |
| 1841 | * (row,col,pass). (See below for these macros.) |
John Bowler | 0a5c9c0 | 2011-01-22 17:36:34 -0600 | [diff] [blame] | 1842 | */ |
John Bowler | 5d56786 | 2011-12-24 09:12:00 -0600 | [diff] [blame] | 1843 | PNG_EXPORT(217, png_uint_32, png_get_current_row_number, (png_const_structrp)); |
| 1844 | PNG_EXPORT(218, png_byte, png_get_current_pass_number, (png_const_structrp)); |
Glenn Randers-Pehrson | 4393a9a | 1999-09-17 12:27:26 -0500 | [diff] [blame] | 1845 | #endif |
| 1846 | |
Glenn Randers-Pehrson | 871b1d0 | 2013-03-02 14:58:22 -0600 | [diff] [blame] | 1847 | #ifdef PNG_READ_USER_CHUNKS_SUPPORTED |
John Bowler | e15b537 | 2013-03-02 17:59:43 -0600 | [diff] [blame] | 1848 | /* This callback is called only for *unknown* chunks. If |
Glenn Randers-Pehrson | 871b1d0 | 2013-03-02 14:58:22 -0600 | [diff] [blame] | 1849 | * PNG_HANDLE_AS_UNKNOWN_SUPPORTED is set then it is possible to set known |
| 1850 | * chunks to be treated as unknown, however in this case the callback must do |
| 1851 | * any processing required by the chunk (e.g. by calling the appropriate |
| 1852 | * png_set_ APIs.) |
| 1853 | * |
| 1854 | * There is no write support - on write, by default, all the chunks in the |
| 1855 | * 'unknown' list are written in the specified position. |
| 1856 | * |
| 1857 | * The integer return from the callback function is interpreted thus: |
| 1858 | * |
| 1859 | * negative: An error occured, png_chunk_error will be called. |
John Bowler | e15b537 | 2013-03-02 17:59:43 -0600 | [diff] [blame] | 1860 | * zero: The chunk was not handled, the chunk will be saved. A critical |
| 1861 | * chunk will cause an error at this point unless it is to be saved. |
Glenn Randers-Pehrson | 871b1d0 | 2013-03-02 14:58:22 -0600 | [diff] [blame] | 1862 | * positive: The chunk was handled, libpng will ignore/discard it. |
John Bowler | e15b537 | 2013-03-02 17:59:43 -0600 | [diff] [blame] | 1863 | * |
| 1864 | * See "INTERACTION WTIH USER CHUNK CALLBACKS" below for important notes about |
| 1865 | * how this behavior will change in libpng 1.7 |
Glenn Randers-Pehrson | 871b1d0 | 2013-03-02 14:58:22 -0600 | [diff] [blame] | 1866 | */ |
John Bowler | 5d56786 | 2011-12-24 09:12:00 -0600 | [diff] [blame] | 1867 | PNG_EXPORT(88, void, png_set_read_user_chunk_fn, (png_structrp png_ptr, |
Glenn Randers-Pehrson | 23d3970 | 2010-12-06 18:28:02 -0600 | [diff] [blame] | 1868 | png_voidp user_chunk_ptr, png_user_chunk_ptr read_user_chunk_fn)); |
Glenn Randers-Pehrson | 871b1d0 | 2013-03-02 14:58:22 -0600 | [diff] [blame] | 1869 | #endif |
| 1870 | |
| 1871 | #ifdef PNG_USER_CHUNKS_SUPPORTED |
John Bowler | 5d56786 | 2011-12-24 09:12:00 -0600 | [diff] [blame] | 1872 | PNG_EXPORT(89, png_voidp, png_get_user_chunk_ptr, (png_const_structrp png_ptr)); |
Glenn Randers-Pehrson | 61c32d9 | 2000-02-04 23:40:16 -0600 | [diff] [blame] | 1873 | #endif |
| 1874 | |
Guy Schalnat | 4ee97b0 | 1996-01-16 01:51:56 -0600 | [diff] [blame] | 1875 | #ifdef PNG_PROGRESSIVE_READ_SUPPORTED |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 1876 | /* Sets the function callbacks for the push reader, and a pointer to a |
| 1877 | * user-defined structure available to the callback functions. |
| 1878 | */ |
John Bowler | 5d56786 | 2011-12-24 09:12:00 -0600 | [diff] [blame] | 1879 | PNG_EXPORT(90, void, png_set_progressive_read_fn, (png_structrp png_ptr, |
Glenn Randers-Pehrson | c36bb79 | 2011-02-12 09:49:07 -0600 | [diff] [blame] | 1880 | png_voidp progressive_ptr, png_progressive_info_ptr info_fn, |
Glenn Randers-Pehrson | 23d3970 | 2010-12-06 18:28:02 -0600 | [diff] [blame] | 1881 | png_progressive_row_ptr row_fn, png_progressive_end_ptr end_fn)); |
Guy Schalnat | 6d76471 | 1995-12-19 03:22:19 -0600 | [diff] [blame] | 1882 | |
Glenn Randers-Pehrson | 6c7a09a | 2009-06-15 21:57:39 -0500 | [diff] [blame] | 1883 | /* Returns the user pointer associated with the push read functions */ |
Glenn Randers-Pehrson | 871b1d0 | 2013-03-02 14:58:22 -0600 | [diff] [blame] | 1884 | PNG_EXPORT(91, png_voidp, png_get_progressive_ptr, |
| 1885 | (png_const_structrp png_ptr)); |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 1886 | |
Glenn Randers-Pehrson | 6c7a09a | 2009-06-15 21:57:39 -0500 | [diff] [blame] | 1887 | /* Function to be called when data becomes available */ |
Glenn Randers-Pehrson | 871b1d0 | 2013-03-02 14:58:22 -0600 | [diff] [blame] | 1888 | PNG_EXPORT(92, void, png_process_data, (png_structrp png_ptr, |
| 1889 | png_inforp info_ptr, png_bytep buffer, png_size_t buffer_size)); |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 1890 | |
John Bowler | 0a5c9c0 | 2011-01-22 17:36:34 -0600 | [diff] [blame] | 1891 | /* A function which may be called *only* within png_process_data to stop the |
| 1892 | * processing of any more data. The function returns the number of bytes |
| 1893 | * remaining, excluding any that libpng has cached internally. A subsequent |
| 1894 | * call to png_process_data must supply these bytes again. If the argument |
| 1895 | * 'save' is set to true the routine will first save all the pending data and |
| 1896 | * will always return 0. |
| 1897 | */ |
John Bowler | 5d56786 | 2011-12-24 09:12:00 -0600 | [diff] [blame] | 1898 | PNG_EXPORT(219, png_size_t, png_process_data_pause, (png_structrp, int save)); |
John Bowler | 0a5c9c0 | 2011-01-22 17:36:34 -0600 | [diff] [blame] | 1899 | |
| 1900 | /* A function which may be called *only* outside (after) a call to |
| 1901 | * png_process_data. It returns the number of bytes of data to skip in the |
| 1902 | * input. Normally it will return 0, but if it returns a non-zero value the |
| 1903 | * application must skip than number of bytes of input data and pass the |
| 1904 | * following data to the next call to png_process_data. |
| 1905 | */ |
John Bowler | 5d56786 | 2011-12-24 09:12:00 -0600 | [diff] [blame] | 1906 | PNG_EXPORT(220, png_uint_32, png_process_data_skip, (png_structrp)); |
John Bowler | 0a5c9c0 | 2011-01-22 17:36:34 -0600 | [diff] [blame] | 1907 | |
Glenn Randers-Pehrson | 4daae30 | 2011-10-06 21:37:47 -0500 | [diff] [blame] | 1908 | #ifdef PNG_READ_INTERLACING_SUPPORTED |
Glenn Randers-Pehrson | 9f044c1 | 2010-12-07 14:59:43 -0600 | [diff] [blame] | 1909 | /* Function that combines rows. 'new_row' is a flag that should come from |
| 1910 | * the callback and be non-NULL if anything needs to be done; the library |
| 1911 | * stores its own version of the new data internally and ignores the passed |
| 1912 | * in value. |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 1913 | */ |
John Bowler | 5d56786 | 2011-12-24 09:12:00 -0600 | [diff] [blame] | 1914 | PNG_EXPORT(93, void, png_progressive_combine_row, (png_const_structrp png_ptr, |
Glenn Randers-Pehrson | 23d3970 | 2010-12-06 18:28:02 -0600 | [diff] [blame] | 1915 | png_bytep old_row, png_const_bytep new_row)); |
Glenn Randers-Pehrson | 4daae30 | 2011-10-06 21:37:47 -0500 | [diff] [blame] | 1916 | #endif /* PNG_READ_INTERLACING_SUPPORTED */ |
Guy Schalnat | 4ee97b0 | 1996-01-16 01:51:56 -0600 | [diff] [blame] | 1917 | #endif /* PNG_PROGRESSIVE_READ_SUPPORTED */ |
Guy Schalnat | 6d76471 | 1995-12-19 03:22:19 -0600 | [diff] [blame] | 1918 | |
John Bowler | 5d56786 | 2011-12-24 09:12:00 -0600 | [diff] [blame] | 1919 | PNG_EXPORTA(94, png_voidp, png_malloc, (png_const_structrp png_ptr, |
John Bowler | 40b2603 | 2011-12-22 08:09:15 -0600 | [diff] [blame] | 1920 | png_alloc_size_t size), PNG_ALLOCATED); |
Glenn Randers-Pehrson | 0ffb71a | 2009-02-28 06:08:20 -0600 | [diff] [blame] | 1921 | /* Added at libpng version 1.4.0 */ |
John Bowler | 5d56786 | 2011-12-24 09:12:00 -0600 | [diff] [blame] | 1922 | PNG_EXPORTA(95, png_voidp, png_calloc, (png_const_structrp png_ptr, |
John Bowler | 40b2603 | 2011-12-22 08:09:15 -0600 | [diff] [blame] | 1923 | png_alloc_size_t size), PNG_ALLOCATED); |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 1924 | |
Glenn Randers-Pehrson | 07748d1 | 2002-05-25 11:12:10 -0500 | [diff] [blame] | 1925 | /* Added at libpng version 1.2.4 */ |
John Bowler | 5d56786 | 2011-12-24 09:12:00 -0600 | [diff] [blame] | 1926 | PNG_EXPORTA(96, png_voidp, png_malloc_warn, (png_const_structrp png_ptr, |
Glenn Randers-Pehrson | 23d3970 | 2010-12-06 18:28:02 -0600 | [diff] [blame] | 1927 | png_alloc_size_t size), PNG_ALLOCATED); |
Glenn Randers-Pehrson | 07748d1 | 2002-05-25 11:12:10 -0500 | [diff] [blame] | 1928 | |
Glenn Randers-Pehrson | beb572e | 2006-08-19 13:59:24 -0500 | [diff] [blame] | 1929 | /* Frees a pointer allocated by png_malloc() */ |
John Bowler | 5d56786 | 2011-12-24 09:12:00 -0600 | [diff] [blame] | 1930 | PNG_EXPORT(97, void, png_free, (png_const_structrp png_ptr, png_voidp ptr)); |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 1931 | |
Glenn Randers-Pehrson | 38e6e77 | 2000-04-09 19:06:13 -0500 | [diff] [blame] | 1932 | /* Free data that was allocated internally */ |
John Bowler | 5d56786 | 2011-12-24 09:12:00 -0600 | [diff] [blame] | 1933 | PNG_EXPORT(98, void, png_free_data, (png_const_structrp png_ptr, |
| 1934 | png_inforp info_ptr, png_uint_32 free_me, int num)); |
Glenn Randers-Pehrson | 23d3970 | 2010-12-06 18:28:02 -0600 | [diff] [blame] | 1935 | |
Glenn Randers-Pehrson | 38e6e77 | 2000-04-09 19:06:13 -0500 | [diff] [blame] | 1936 | /* Reassign responsibility for freeing existing data, whether allocated |
John Bowler | 40b2603 | 2011-12-22 08:09:15 -0600 | [diff] [blame] | 1937 | * by libpng or by the application; this works on the png_info structure passed |
| 1938 | * in, it does not change the state for other png_info structures. |
Glenn Randers-Pehrson | 871b1d0 | 2013-03-02 14:58:22 -0600 | [diff] [blame] | 1939 | * |
| 1940 | * It is unlikely that this function works correctly as of 1.6.0 and using it |
| 1941 | * may result either in memory leaks or double free of allocated data. |
John Bowler | 40b2603 | 2011-12-22 08:09:15 -0600 | [diff] [blame] | 1942 | */ |
Glenn Randers-Pehrson | 871b1d0 | 2013-03-02 14:58:22 -0600 | [diff] [blame] | 1943 | PNG_EXPORTA(99, void, png_data_freer, (png_const_structrp png_ptr, |
| 1944 | png_inforp info_ptr, int freer, png_uint_32 mask), PNG_DEPRECATED); |
Glenn Randers-Pehrson | 23d3970 | 2010-12-06 18:28:02 -0600 | [diff] [blame] | 1945 | |
Glenn Randers-Pehrson | 6c7a09a | 2009-06-15 21:57:39 -0500 | [diff] [blame] | 1946 | /* Assignments for png_data_freer */ |
Glenn Randers-Pehrson | 38e6e77 | 2000-04-09 19:06:13 -0500 | [diff] [blame] | 1947 | #define PNG_DESTROY_WILL_FREE_DATA 1 |
| 1948 | #define PNG_SET_WILL_FREE_DATA 1 |
| 1949 | #define PNG_USER_WILL_FREE_DATA 2 |
| 1950 | /* Flags for png_ptr->free_me and info_ptr->free_me */ |
Glenn Randers-Pehrson | a77ef62 | 2000-02-18 13:48:52 -0600 | [diff] [blame] | 1951 | #define PNG_FREE_HIST 0x0008 |
| 1952 | #define PNG_FREE_ICCP 0x0010 |
| 1953 | #define PNG_FREE_SPLT 0x0020 |
| 1954 | #define PNG_FREE_ROWS 0x0040 |
Glenn Randers-Pehrson | 1ef65b6 | 2000-05-12 06:19:53 -0500 | [diff] [blame] | 1955 | #define PNG_FREE_PCAL 0x0080 |
| 1956 | #define PNG_FREE_SCAL 0x0100 |
Glenn Randers-Pehrson | 871b1d0 | 2013-03-02 14:58:22 -0600 | [diff] [blame] | 1957 | #ifdef PNG_STORE_UNKNOWN_CHUNKS_SUPPORTED |
| 1958 | # define PNG_FREE_UNKN 0x0200 |
| 1959 | #endif |
| 1960 | /* PNG_FREE_LIST 0x0400 removed in 1.6.0 because it is ignored */ |
Glenn Randers-Pehrson | 6942d53 | 2000-05-01 09:31:54 -0500 | [diff] [blame] | 1961 | #define PNG_FREE_PLTE 0x1000 |
| 1962 | #define PNG_FREE_TRNS 0x2000 |
| 1963 | #define PNG_FREE_TEXT 0x4000 |
Glenn Randers-Pehrson | 1ef65b6 | 2000-05-12 06:19:53 -0500 | [diff] [blame] | 1964 | #define PNG_FREE_ALL 0x7fff |
Glenn Randers-Pehrson | ec61c23 | 2000-05-16 06:17:36 -0500 | [diff] [blame] | 1965 | #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] | 1966 | |
Glenn Randers-Pehrson | f7d1a17 | 1998-06-06 15:31:35 -0500 | [diff] [blame] | 1967 | #ifdef PNG_USER_MEM_SUPPORTED |
John Bowler | 5d56786 | 2011-12-24 09:12:00 -0600 | [diff] [blame] | 1968 | PNG_EXPORTA(100, png_voidp, png_malloc_default, (png_const_structrp png_ptr, |
John Bowler | d332c67 | 2011-12-21 17:36:12 -0600 | [diff] [blame] | 1969 | png_alloc_size_t size), PNG_ALLOCATED PNG_DEPRECATED); |
John Bowler | 5d56786 | 2011-12-24 09:12:00 -0600 | [diff] [blame] | 1970 | PNG_EXPORTA(101, void, png_free_default, (png_const_structrp png_ptr, |
John Bowler | 40b2603 | 2011-12-22 08:09:15 -0600 | [diff] [blame] | 1971 | png_voidp ptr), PNG_DEPRECATED); |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame] | 1972 | #endif |
Glenn Randers-Pehrson | f7d1a17 | 1998-06-06 15:31:35 -0500 | [diff] [blame] | 1973 | |
Glenn Randers-Pehrson | 862cb20 | 2010-04-16 22:12:51 -0500 | [diff] [blame] | 1974 | #ifdef PNG_ERROR_TEXT_SUPPORTED |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 1975 | /* Fatal error in PNG image of libpng - can't continue */ |
John Bowler | 5d56786 | 2011-12-24 09:12:00 -0600 | [diff] [blame] | 1976 | PNG_EXPORTA(102, void, png_error, (png_const_structrp png_ptr, |
John Bowler | 40b2603 | 2011-12-22 08:09:15 -0600 | [diff] [blame] | 1977 | png_const_charp error_message), PNG_NORETURN); |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 1978 | |
Glenn Randers-Pehrson | 70e3f54 | 1998-01-03 22:40:55 -0600 | [diff] [blame] | 1979 | /* The same, but the chunk name is prepended to the error string. */ |
John Bowler | 5d56786 | 2011-12-24 09:12:00 -0600 | [diff] [blame] | 1980 | PNG_EXPORTA(103, void, png_chunk_error, (png_const_structrp png_ptr, |
Glenn Randers-Pehrson | 23d3970 | 2010-12-06 18:28:02 -0600 | [diff] [blame] | 1981 | png_const_charp error_message), PNG_NORETURN); |
Glenn Randers-Pehrson | 70e3f54 | 1998-01-03 22:40:55 -0600 | [diff] [blame] | 1982 | |
Glenn Randers-Pehrson | fd10753 | 2009-11-10 05:59:22 -0600 | [diff] [blame] | 1983 | #else |
| 1984 | /* Fatal error in PNG image of libpng - can't continue */ |
John Bowler | 5d56786 | 2011-12-24 09:12:00 -0600 | [diff] [blame] | 1985 | PNG_EXPORTA(104, void, png_err, (png_const_structrp png_ptr), PNG_NORETURN); |
Glenn Randers-Pehrson | fd10753 | 2009-11-10 05:59:22 -0600 | [diff] [blame] | 1986 | #endif |
| 1987 | |
John Bowler | 88b77cc | 2011-05-05 06:49:55 -0500 | [diff] [blame] | 1988 | #ifdef PNG_WARNINGS_SUPPORTED |
Guy Schalnat | 6d76471 | 1995-12-19 03:22:19 -0600 | [diff] [blame] | 1989 | /* Non-fatal error in libpng. Can continue, but may have a problem. */ |
John Bowler | 5d56786 | 2011-12-24 09:12:00 -0600 | [diff] [blame] | 1990 | PNG_EXPORT(105, void, png_warning, (png_const_structrp png_ptr, |
Glenn Randers-Pehrson | 23d3970 | 2010-12-06 18:28:02 -0600 | [diff] [blame] | 1991 | png_const_charp warning_message)); |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 1992 | |
Glenn Randers-Pehrson | 70e3f54 | 1998-01-03 22:40:55 -0600 | [diff] [blame] | 1993 | /* Non-fatal error in libpng, chunk name is prepended to message. */ |
John Bowler | 5d56786 | 2011-12-24 09:12:00 -0600 | [diff] [blame] | 1994 | PNG_EXPORT(106, void, png_chunk_warning, (png_const_structrp png_ptr, |
Glenn Randers-Pehrson | 23d3970 | 2010-12-06 18:28:02 -0600 | [diff] [blame] | 1995 | png_const_charp warning_message)); |
John Bowler | 88b77cc | 2011-05-05 06:49:55 -0500 | [diff] [blame] | 1996 | #endif |
Glenn Randers-Pehrson | 70e3f54 | 1998-01-03 22:40:55 -0600 | [diff] [blame] | 1997 | |
Glenn Randers-Pehrson | 6bc53be | 2006-06-16 07:52:03 -0500 | [diff] [blame] | 1998 | #ifdef PNG_BENIGN_ERRORS_SUPPORTED |
| 1999 | /* Benign error in libpng. Can continue, but may have a problem. |
| 2000 | * User can choose whether to handle as a fatal error or as a warning. */ |
John Bowler | 5d56786 | 2011-12-24 09:12:00 -0600 | [diff] [blame] | 2001 | PNG_EXPORT(107, void, png_benign_error, (png_const_structrp png_ptr, |
Glenn Randers-Pehrson | 23d3970 | 2010-12-06 18:28:02 -0600 | [diff] [blame] | 2002 | png_const_charp warning_message)); |
Glenn Randers-Pehrson | 6bc53be | 2006-06-16 07:52:03 -0500 | [diff] [blame] | 2003 | |
Glenn Randers-Pehrson | 871b1d0 | 2013-03-02 14:58:22 -0600 | [diff] [blame] | 2004 | #ifdef PNG_READ_SUPPORTED |
| 2005 | /* Same, chunk name is prepended to message (only during read) */ |
John Bowler | 5d56786 | 2011-12-24 09:12:00 -0600 | [diff] [blame] | 2006 | PNG_EXPORT(108, void, png_chunk_benign_error, (png_const_structrp png_ptr, |
Glenn Randers-Pehrson | 23d3970 | 2010-12-06 18:28:02 -0600 | [diff] [blame] | 2007 | png_const_charp warning_message)); |
Glenn Randers-Pehrson | 871b1d0 | 2013-03-02 14:58:22 -0600 | [diff] [blame] | 2008 | #endif |
Glenn Randers-Pehrson | 6bc53be | 2006-06-16 07:52:03 -0500 | [diff] [blame] | 2009 | |
Glenn Randers-Pehrson | 23d3970 | 2010-12-06 18:28:02 -0600 | [diff] [blame] | 2010 | PNG_EXPORT(109, void, png_set_benign_errors, |
John Bowler | 5d56786 | 2011-12-24 09:12:00 -0600 | [diff] [blame] | 2011 | (png_structrp png_ptr, int allowed)); |
Glenn Randers-Pehrson | 862cb20 | 2010-04-16 22:12:51 -0500 | [diff] [blame] | 2012 | #else |
| 2013 | # ifdef PNG_ALLOW_BENIGN_ERRORS |
| 2014 | # define png_benign_error png_warning |
| 2015 | # define png_chunk_benign_error png_chunk_warning |
| 2016 | # else |
| 2017 | # define png_benign_error png_error |
| 2018 | # define png_chunk_benign_error png_chunk_error |
| 2019 | # endif |
Glenn Randers-Pehrson | 6bc53be | 2006-06-16 07:52:03 -0500 | [diff] [blame] | 2020 | #endif |
| 2021 | |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 2022 | /* The png_set_<chunk> functions are for storing values in the png_info_struct. |
| 2023 | * Similarly, the png_get_<chunk> calls are used to read values from the |
| 2024 | * png_info_struct, either storing the parameters in the passed variables, or |
| 2025 | * setting pointers into the png_info_struct where the data is stored. The |
| 2026 | * png_get_<chunk> functions return a non-zero value if the data was available |
| 2027 | * in info_ptr, or return zero and do not change any of the parameters if the |
| 2028 | * data was not available. |
| 2029 | * |
| 2030 | * These functions should be used instead of directly accessing png_info |
| 2031 | * to avoid problems with future changes in the size and internal layout of |
| 2032 | * png_info_struct. |
| 2033 | */ |
Glenn Randers-Pehrson | 46f61e2 | 1998-01-30 21:45:12 -0600 | [diff] [blame] | 2034 | /* Returns "flag" if chunk data is valid in info_ptr. */ |
John Bowler | 5d56786 | 2011-12-24 09:12:00 -0600 | [diff] [blame] | 2035 | PNG_EXPORT(110, png_uint_32, png_get_valid, (png_const_structrp png_ptr, |
| 2036 | png_const_inforp info_ptr, png_uint_32 flag)); |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 2037 | |
Glenn Randers-Pehrson | 46f61e2 | 1998-01-30 21:45:12 -0600 | [diff] [blame] | 2038 | /* Returns number of bytes needed to hold a transformed row. */ |
John Bowler | 5d56786 | 2011-12-24 09:12:00 -0600 | [diff] [blame] | 2039 | PNG_EXPORT(111, png_size_t, png_get_rowbytes, (png_const_structrp png_ptr, |
| 2040 | png_const_inforp info_ptr)); |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 2041 | |
Glenn Randers-Pehrson | 4e6b5e9 | 2009-09-23 10:24:53 -0500 | [diff] [blame] | 2042 | #ifdef PNG_INFO_IMAGE_SUPPORTED |
Glenn Randers-Pehrson | a77ef62 | 2000-02-18 13:48:52 -0600 | [diff] [blame] | 2043 | /* Returns row_pointers, which is an array of pointers to scanlines that was |
Glenn Randers-Pehrson | 6c7a09a | 2009-06-15 21:57:39 -0500 | [diff] [blame] | 2044 | * returned from png_read_png(). |
| 2045 | */ |
John Bowler | 5d56786 | 2011-12-24 09:12:00 -0600 | [diff] [blame] | 2046 | PNG_EXPORT(112, png_bytepp, png_get_rows, (png_const_structrp png_ptr, |
| 2047 | png_const_inforp info_ptr)); |
John Bowler | 40b2603 | 2011-12-22 08:09:15 -0600 | [diff] [blame] | 2048 | |
Glenn Randers-Pehrson | a77ef62 | 2000-02-18 13:48:52 -0600 | [diff] [blame] | 2049 | /* Set row_pointers, which is an array of pointers to scanlines for use |
Glenn Randers-Pehrson | 6c7a09a | 2009-06-15 21:57:39 -0500 | [diff] [blame] | 2050 | * by png_write_png(). |
| 2051 | */ |
John Bowler | 4f67e40 | 2011-12-28 08:43:37 -0600 | [diff] [blame] | 2052 | PNG_EXPORT(113, void, png_set_rows, (png_const_structrp png_ptr, |
| 2053 | png_inforp info_ptr, png_bytepp row_pointers)); |
Glenn Randers-Pehrson | a77ef62 | 2000-02-18 13:48:52 -0600 | [diff] [blame] | 2054 | #endif |
| 2055 | |
Glenn Randers-Pehrson | 46f61e2 | 1998-01-30 21:45:12 -0600 | [diff] [blame] | 2056 | /* Returns number of color channels in image. */ |
John Bowler | 5d56786 | 2011-12-24 09:12:00 -0600 | [diff] [blame] | 2057 | PNG_EXPORT(114, png_byte, png_get_channels, (png_const_structrp png_ptr, |
| 2058 | png_const_inforp info_ptr)); |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 2059 | |
Glenn Randers-Pehrson | 46f61e2 | 1998-01-30 21:45:12 -0600 | [diff] [blame] | 2060 | #ifdef PNG_EASY_ACCESS_SUPPORTED |
| 2061 | /* Returns image width in pixels. */ |
John Bowler | 5d56786 | 2011-12-24 09:12:00 -0600 | [diff] [blame] | 2062 | PNG_EXPORT(115, png_uint_32, png_get_image_width, (png_const_structrp png_ptr, |
| 2063 | png_const_inforp info_ptr)); |
Glenn Randers-Pehrson | 46f61e2 | 1998-01-30 21:45:12 -0600 | [diff] [blame] | 2064 | |
| 2065 | /* Returns image height in pixels. */ |
John Bowler | 5d56786 | 2011-12-24 09:12:00 -0600 | [diff] [blame] | 2066 | PNG_EXPORT(116, png_uint_32, png_get_image_height, (png_const_structrp png_ptr, |
| 2067 | png_const_inforp info_ptr)); |
Glenn Randers-Pehrson | 46f61e2 | 1998-01-30 21:45:12 -0600 | [diff] [blame] | 2068 | |
| 2069 | /* Returns image bit_depth. */ |
John Bowler | 5d56786 | 2011-12-24 09:12:00 -0600 | [diff] [blame] | 2070 | PNG_EXPORT(117, png_byte, png_get_bit_depth, (png_const_structrp png_ptr, |
| 2071 | png_const_inforp info_ptr)); |
Glenn Randers-Pehrson | 46f61e2 | 1998-01-30 21:45:12 -0600 | [diff] [blame] | 2072 | |
| 2073 | /* Returns image color_type. */ |
John Bowler | 5d56786 | 2011-12-24 09:12:00 -0600 | [diff] [blame] | 2074 | PNG_EXPORT(118, png_byte, png_get_color_type, (png_const_structrp png_ptr, |
| 2075 | png_const_inforp info_ptr)); |
Glenn Randers-Pehrson | 46f61e2 | 1998-01-30 21:45:12 -0600 | [diff] [blame] | 2076 | |
| 2077 | /* Returns image filter_type. */ |
John Bowler | 5d56786 | 2011-12-24 09:12:00 -0600 | [diff] [blame] | 2078 | PNG_EXPORT(119, png_byte, png_get_filter_type, (png_const_structrp png_ptr, |
| 2079 | png_const_inforp info_ptr)); |
Glenn Randers-Pehrson | 46f61e2 | 1998-01-30 21:45:12 -0600 | [diff] [blame] | 2080 | |
| 2081 | /* Returns image interlace_type. */ |
John Bowler | 5d56786 | 2011-12-24 09:12:00 -0600 | [diff] [blame] | 2082 | PNG_EXPORT(120, png_byte, png_get_interlace_type, (png_const_structrp png_ptr, |
| 2083 | png_const_inforp info_ptr)); |
Glenn Randers-Pehrson | 46f61e2 | 1998-01-30 21:45:12 -0600 | [diff] [blame] | 2084 | |
| 2085 | /* Returns image compression_type. */ |
John Bowler | 5d56786 | 2011-12-24 09:12:00 -0600 | [diff] [blame] | 2086 | PNG_EXPORT(121, png_byte, png_get_compression_type, (png_const_structrp png_ptr, |
| 2087 | png_const_inforp info_ptr)); |
Glenn Randers-Pehrson | 46f61e2 | 1998-01-30 21:45:12 -0600 | [diff] [blame] | 2088 | |
| 2089 | /* Returns image resolution in pixels per meter, from pHYs chunk data. */ |
Glenn Randers-Pehrson | b86b492 | 2011-01-21 23:12:51 -0600 | [diff] [blame] | 2090 | PNG_EXPORT(122, png_uint_32, png_get_pixels_per_meter, |
John Bowler | 5d56786 | 2011-12-24 09:12:00 -0600 | [diff] [blame] | 2091 | (png_const_structrp png_ptr, png_const_inforp info_ptr)); |
Glenn Randers-Pehrson | b86b492 | 2011-01-21 23:12:51 -0600 | [diff] [blame] | 2092 | PNG_EXPORT(123, png_uint_32, png_get_x_pixels_per_meter, |
John Bowler | 5d56786 | 2011-12-24 09:12:00 -0600 | [diff] [blame] | 2093 | (png_const_structrp png_ptr, png_const_inforp info_ptr)); |
Glenn Randers-Pehrson | b86b492 | 2011-01-21 23:12:51 -0600 | [diff] [blame] | 2094 | PNG_EXPORT(124, png_uint_32, png_get_y_pixels_per_meter, |
John Bowler | 5d56786 | 2011-12-24 09:12:00 -0600 | [diff] [blame] | 2095 | (png_const_structrp png_ptr, png_const_inforp info_ptr)); |
Glenn Randers-Pehrson | 46f61e2 | 1998-01-30 21:45:12 -0600 | [diff] [blame] | 2096 | |
| 2097 | /* Returns pixel aspect ratio, computed from pHYs chunk data. */ |
Glenn Randers-Pehrson | b86b492 | 2011-01-21 23:12:51 -0600 | [diff] [blame] | 2098 | PNG_FP_EXPORT(125, float, png_get_pixel_aspect_ratio, |
Glenn Randers-Pehrson | 871b1d0 | 2013-03-02 14:58:22 -0600 | [diff] [blame] | 2099 | (png_const_structrp png_ptr, png_const_inforp info_ptr)) |
Glenn Randers-Pehrson | c36bb79 | 2011-02-12 09:49:07 -0600 | [diff] [blame] | 2100 | PNG_FIXED_EXPORT(210, png_fixed_point, png_get_pixel_aspect_ratio_fixed, |
Glenn Randers-Pehrson | 871b1d0 | 2013-03-02 14:58:22 -0600 | [diff] [blame] | 2101 | (png_const_structrp png_ptr, png_const_inforp info_ptr)) |
Glenn Randers-Pehrson | 46f61e2 | 1998-01-30 21:45:12 -0600 | [diff] [blame] | 2102 | |
| 2103 | /* Returns image x, y offset in pixels or microns, from oFFs chunk data. */ |
Glenn Randers-Pehrson | 871b1d0 | 2013-03-02 14:58:22 -0600 | [diff] [blame] | 2104 | PNG_EXPORT(126, png_int_32, png_get_x_offset_pixels, |
| 2105 | (png_const_structrp png_ptr, png_const_inforp info_ptr)); |
| 2106 | PNG_EXPORT(127, png_int_32, png_get_y_offset_pixels, |
| 2107 | (png_const_structrp png_ptr, png_const_inforp info_ptr)); |
Glenn Randers-Pehrson | b86b492 | 2011-01-21 23:12:51 -0600 | [diff] [blame] | 2108 | PNG_EXPORT(128, png_int_32, png_get_x_offset_microns, |
John Bowler | 5d56786 | 2011-12-24 09:12:00 -0600 | [diff] [blame] | 2109 | (png_const_structrp png_ptr, png_const_inforp info_ptr)); |
Glenn Randers-Pehrson | b86b492 | 2011-01-21 23:12:51 -0600 | [diff] [blame] | 2110 | PNG_EXPORT(129, png_int_32, png_get_y_offset_microns, |
John Bowler | 5d56786 | 2011-12-24 09:12:00 -0600 | [diff] [blame] | 2111 | (png_const_structrp png_ptr, png_const_inforp info_ptr)); |
Glenn Randers-Pehrson | 46f61e2 | 1998-01-30 21:45:12 -0600 | [diff] [blame] | 2112 | |
| 2113 | #endif /* PNG_EASY_ACCESS_SUPPORTED */ |
| 2114 | |
Glenn Randers-Pehrson | 871b1d0 | 2013-03-02 14:58:22 -0600 | [diff] [blame] | 2115 | #ifdef PNG_READ_SUPPORTED |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 2116 | /* Returns pointer to signature string read from PNG header */ |
John Bowler | 5d56786 | 2011-12-24 09:12:00 -0600 | [diff] [blame] | 2117 | PNG_EXPORT(130, png_const_bytep, png_get_signature, (png_const_structrp png_ptr, |
John Bowler | 4f67e40 | 2011-12-28 08:43:37 -0600 | [diff] [blame] | 2118 | png_const_inforp info_ptr)); |
Glenn Randers-Pehrson | 871b1d0 | 2013-03-02 14:58:22 -0600 | [diff] [blame] | 2119 | #endif |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 2120 | |
Glenn Randers-Pehrson | 4e6b5e9 | 2009-09-23 10:24:53 -0500 | [diff] [blame] | 2121 | #ifdef PNG_bKGD_SUPPORTED |
John Bowler | 5d56786 | 2011-12-24 09:12:00 -0600 | [diff] [blame] | 2122 | PNG_EXPORT(131, png_uint_32, png_get_bKGD, (png_const_structrp png_ptr, |
| 2123 | png_inforp info_ptr, png_color_16p *background)); |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame] | 2124 | #endif |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 2125 | |
Glenn Randers-Pehrson | 4e6b5e9 | 2009-09-23 10:24:53 -0500 | [diff] [blame] | 2126 | #ifdef PNG_bKGD_SUPPORTED |
John Bowler | 4f67e40 | 2011-12-28 08:43:37 -0600 | [diff] [blame] | 2127 | PNG_EXPORT(132, void, png_set_bKGD, (png_const_structrp png_ptr, |
| 2128 | png_inforp info_ptr, png_const_color_16p background)); |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame] | 2129 | #endif |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 2130 | |
Glenn Randers-Pehrson | 4e6b5e9 | 2009-09-23 10:24:53 -0500 | [diff] [blame] | 2131 | #ifdef PNG_cHRM_SUPPORTED |
John Bowler | 5d56786 | 2011-12-24 09:12:00 -0600 | [diff] [blame] | 2132 | PNG_FP_EXPORT(133, png_uint_32, png_get_cHRM, (png_const_structrp png_ptr, |
Glenn Randers-Pehrson | 871b1d0 | 2013-03-02 14:58:22 -0600 | [diff] [blame] | 2133 | png_const_inforp info_ptr, double *white_x, double *white_y, double *red_x, |
Glenn Randers-Pehrson | c36bb79 | 2011-02-12 09:49:07 -0600 | [diff] [blame] | 2134 | double *red_y, double *green_x, double *green_y, double *blue_x, |
Glenn Randers-Pehrson | 871b1d0 | 2013-03-02 14:58:22 -0600 | [diff] [blame] | 2135 | double *blue_y)) |
John Bowler | 5d56786 | 2011-12-24 09:12:00 -0600 | [diff] [blame] | 2136 | PNG_FP_EXPORT(230, png_uint_32, png_get_cHRM_XYZ, (png_const_structrp png_ptr, |
| 2137 | png_const_inforp info_ptr, double *red_X, double *red_Y, double *red_Z, |
John Bowler | 736f40f | 2011-08-25 16:19:44 -0500 | [diff] [blame] | 2138 | double *green_X, double *green_Y, double *green_Z, double *blue_X, |
Glenn Randers-Pehrson | 871b1d0 | 2013-03-02 14:58:22 -0600 | [diff] [blame] | 2139 | double *blue_Y, double *blue_Z)) |
Glenn Randers-Pehrson | b86b492 | 2011-01-21 23:12:51 -0600 | [diff] [blame] | 2140 | PNG_FIXED_EXPORT(134, png_uint_32, png_get_cHRM_fixed, |
John Bowler | 5d56786 | 2011-12-24 09:12:00 -0600 | [diff] [blame] | 2141 | (png_const_structrp png_ptr, png_const_inforp info_ptr, |
John Bowler | 40b2603 | 2011-12-22 08:09:15 -0600 | [diff] [blame] | 2142 | png_fixed_point *int_white_x, png_fixed_point *int_white_y, |
| 2143 | png_fixed_point *int_red_x, png_fixed_point *int_red_y, |
| 2144 | png_fixed_point *int_green_x, png_fixed_point *int_green_y, |
Glenn Randers-Pehrson | 871b1d0 | 2013-03-02 14:58:22 -0600 | [diff] [blame] | 2145 | png_fixed_point *int_blue_x, png_fixed_point *int_blue_y)) |
John Bowler | 736f40f | 2011-08-25 16:19:44 -0500 | [diff] [blame] | 2146 | PNG_FIXED_EXPORT(231, png_uint_32, png_get_cHRM_XYZ_fixed, |
John Bowler | 5d56786 | 2011-12-24 09:12:00 -0600 | [diff] [blame] | 2147 | (png_const_structrp png_ptr, png_const_inforp info_ptr, |
John Bowler | 736f40f | 2011-08-25 16:19:44 -0500 | [diff] [blame] | 2148 | png_fixed_point *int_red_X, png_fixed_point *int_red_Y, |
| 2149 | png_fixed_point *int_red_Z, png_fixed_point *int_green_X, |
| 2150 | png_fixed_point *int_green_Y, png_fixed_point *int_green_Z, |
| 2151 | png_fixed_point *int_blue_X, png_fixed_point *int_blue_Y, |
Glenn Randers-Pehrson | 871b1d0 | 2013-03-02 14:58:22 -0600 | [diff] [blame] | 2152 | png_fixed_point *int_blue_Z)) |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame] | 2153 | #endif |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 2154 | |
Glenn Randers-Pehrson | 4e6b5e9 | 2009-09-23 10:24:53 -0500 | [diff] [blame] | 2155 | #ifdef PNG_cHRM_SUPPORTED |
John Bowler | 4f67e40 | 2011-12-28 08:43:37 -0600 | [diff] [blame] | 2156 | PNG_FP_EXPORT(135, void, png_set_cHRM, (png_const_structrp png_ptr, |
| 2157 | png_inforp info_ptr, |
Glenn Randers-Pehrson | c36bb79 | 2011-02-12 09:49:07 -0600 | [diff] [blame] | 2158 | double white_x, double white_y, double red_x, double red_y, double green_x, |
Glenn Randers-Pehrson | 871b1d0 | 2013-03-02 14:58:22 -0600 | [diff] [blame] | 2159 | double green_y, double blue_x, double blue_y)) |
John Bowler | 4f67e40 | 2011-12-28 08:43:37 -0600 | [diff] [blame] | 2160 | PNG_FP_EXPORT(232, void, png_set_cHRM_XYZ, (png_const_structrp png_ptr, |
John Bowler | 5d56786 | 2011-12-24 09:12:00 -0600 | [diff] [blame] | 2161 | png_inforp info_ptr, double red_X, double red_Y, double red_Z, |
John Bowler | 736f40f | 2011-08-25 16:19:44 -0500 | [diff] [blame] | 2162 | double green_X, double green_Y, double green_Z, double blue_X, |
Glenn Randers-Pehrson | 871b1d0 | 2013-03-02 14:58:22 -0600 | [diff] [blame] | 2163 | double blue_Y, double blue_Z)) |
John Bowler | 4f67e40 | 2011-12-28 08:43:37 -0600 | [diff] [blame] | 2164 | PNG_FIXED_EXPORT(136, void, png_set_cHRM_fixed, (png_const_structrp png_ptr, |
John Bowler | 5d56786 | 2011-12-24 09:12:00 -0600 | [diff] [blame] | 2165 | png_inforp info_ptr, png_fixed_point int_white_x, |
Glenn Randers-Pehrson | c36bb79 | 2011-02-12 09:49:07 -0600 | [diff] [blame] | 2166 | png_fixed_point int_white_y, png_fixed_point int_red_x, |
| 2167 | png_fixed_point int_red_y, png_fixed_point int_green_x, |
| 2168 | png_fixed_point int_green_y, png_fixed_point int_blue_x, |
Glenn Randers-Pehrson | 871b1d0 | 2013-03-02 14:58:22 -0600 | [diff] [blame] | 2169 | png_fixed_point int_blue_y)) |
John Bowler | 4f67e40 | 2011-12-28 08:43:37 -0600 | [diff] [blame] | 2170 | PNG_FIXED_EXPORT(233, void, png_set_cHRM_XYZ_fixed, (png_const_structrp png_ptr, |
John Bowler | 5d56786 | 2011-12-24 09:12:00 -0600 | [diff] [blame] | 2171 | png_inforp info_ptr, png_fixed_point int_red_X, png_fixed_point int_red_Y, |
John Bowler | 736f40f | 2011-08-25 16:19:44 -0500 | [diff] [blame] | 2172 | png_fixed_point int_red_Z, png_fixed_point int_green_X, |
| 2173 | png_fixed_point int_green_Y, png_fixed_point int_green_Z, |
| 2174 | png_fixed_point int_blue_X, png_fixed_point int_blue_Y, |
Glenn Randers-Pehrson | 871b1d0 | 2013-03-02 14:58:22 -0600 | [diff] [blame] | 2175 | png_fixed_point int_blue_Z)) |
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 | 4e6b5e9 | 2009-09-23 10:24:53 -0500 | [diff] [blame] | 2178 | #ifdef PNG_gAMA_SUPPORTED |
John Bowler | 5d56786 | 2011-12-24 09:12:00 -0600 | [diff] [blame] | 2179 | PNG_FP_EXPORT(137, png_uint_32, png_get_gAMA, (png_const_structrp png_ptr, |
Glenn Randers-Pehrson | 871b1d0 | 2013-03-02 14:58:22 -0600 | [diff] [blame] | 2180 | png_const_inforp info_ptr, double *file_gamma)) |
Glenn Randers-Pehrson | b86b492 | 2011-01-21 23:12:51 -0600 | [diff] [blame] | 2181 | PNG_FIXED_EXPORT(138, png_uint_32, png_get_gAMA_fixed, |
John Bowler | 5d56786 | 2011-12-24 09:12:00 -0600 | [diff] [blame] | 2182 | (png_const_structrp png_ptr, png_const_inforp info_ptr, |
Glenn Randers-Pehrson | 871b1d0 | 2013-03-02 14:58:22 -0600 | [diff] [blame] | 2183 | png_fixed_point *int_file_gamma)) |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame] | 2184 | #endif |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 2185 | |
Glenn Randers-Pehrson | 4e6b5e9 | 2009-09-23 10:24:53 -0500 | [diff] [blame] | 2186 | #ifdef PNG_gAMA_SUPPORTED |
John Bowler | 4f67e40 | 2011-12-28 08:43:37 -0600 | [diff] [blame] | 2187 | PNG_FP_EXPORT(139, void, png_set_gAMA, (png_const_structrp png_ptr, |
Glenn Randers-Pehrson | 871b1d0 | 2013-03-02 14:58:22 -0600 | [diff] [blame] | 2188 | png_inforp info_ptr, double file_gamma)) |
John Bowler | 4f67e40 | 2011-12-28 08:43:37 -0600 | [diff] [blame] | 2189 | PNG_FIXED_EXPORT(140, void, png_set_gAMA_fixed, (png_const_structrp png_ptr, |
Glenn Randers-Pehrson | 871b1d0 | 2013-03-02 14:58:22 -0600 | [diff] [blame] | 2190 | png_inforp info_ptr, png_fixed_point int_file_gamma)) |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame] | 2191 | #endif |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 2192 | |
Glenn Randers-Pehrson | 4e6b5e9 | 2009-09-23 10:24:53 -0500 | [diff] [blame] | 2193 | #ifdef PNG_hIST_SUPPORTED |
John Bowler | 5d56786 | 2011-12-24 09:12:00 -0600 | [diff] [blame] | 2194 | PNG_EXPORT(141, png_uint_32, png_get_hIST, (png_const_structrp png_ptr, |
Glenn Randers-Pehrson | 871b1d0 | 2013-03-02 14:58:22 -0600 | [diff] [blame] | 2195 | png_inforp info_ptr, png_uint_16p *hist)); |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame] | 2196 | #endif |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 2197 | |
Glenn Randers-Pehrson | 4e6b5e9 | 2009-09-23 10:24:53 -0500 | [diff] [blame] | 2198 | #ifdef PNG_hIST_SUPPORTED |
John Bowler | 4f67e40 | 2011-12-28 08:43:37 -0600 | [diff] [blame] | 2199 | PNG_EXPORT(142, void, png_set_hIST, (png_const_structrp png_ptr, |
| 2200 | png_inforp info_ptr, png_const_uint_16p hist)); |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame] | 2201 | #endif |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 2202 | |
John Bowler | 5d56786 | 2011-12-24 09:12:00 -0600 | [diff] [blame] | 2203 | PNG_EXPORT(143, png_uint_32, png_get_IHDR, (png_const_structrp png_ptr, |
John Bowler | 4f67e40 | 2011-12-28 08:43:37 -0600 | [diff] [blame] | 2204 | png_const_inforp info_ptr, png_uint_32 *width, png_uint_32 *height, |
John Bowler | 40b2603 | 2011-12-22 08:09:15 -0600 | [diff] [blame] | 2205 | int *bit_depth, int *color_type, int *interlace_method, |
| 2206 | int *compression_method, int *filter_method)); |
Glenn Randers-Pehrson | 5c6aeb2 | 1998-12-29 11:47:59 -0600 | [diff] [blame] | 2207 | |
John Bowler | 4f67e40 | 2011-12-28 08:43:37 -0600 | [diff] [blame] | 2208 | PNG_EXPORT(144, void, png_set_IHDR, (png_const_structrp png_ptr, |
| 2209 | png_inforp info_ptr, png_uint_32 width, png_uint_32 height, int bit_depth, |
| 2210 | int color_type, int interlace_method, int compression_method, |
| 2211 | int filter_method)); |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 2212 | |
Glenn Randers-Pehrson | 4e6b5e9 | 2009-09-23 10:24:53 -0500 | [diff] [blame] | 2213 | #ifdef PNG_oFFs_SUPPORTED |
John Bowler | 5d56786 | 2011-12-24 09:12:00 -0600 | [diff] [blame] | 2214 | PNG_EXPORT(145, png_uint_32, png_get_oFFs, (png_const_structrp png_ptr, |
| 2215 | png_const_inforp info_ptr, png_int_32 *offset_x, png_int_32 *offset_y, |
John Bowler | 40b2603 | 2011-12-22 08:09:15 -0600 | [diff] [blame] | 2216 | int *unit_type)); |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame] | 2217 | #endif |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 2218 | |
Glenn Randers-Pehrson | 4e6b5e9 | 2009-09-23 10:24:53 -0500 | [diff] [blame] | 2219 | #ifdef PNG_oFFs_SUPPORTED |
John Bowler | 4f67e40 | 2011-12-28 08:43:37 -0600 | [diff] [blame] | 2220 | PNG_EXPORT(146, void, png_set_oFFs, (png_const_structrp png_ptr, |
| 2221 | png_inforp info_ptr, png_int_32 offset_x, png_int_32 offset_y, |
| 2222 | int unit_type)); |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame] | 2223 | #endif |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 2224 | |
Glenn Randers-Pehrson | 4e6b5e9 | 2009-09-23 10:24:53 -0500 | [diff] [blame] | 2225 | #ifdef PNG_pCAL_SUPPORTED |
John Bowler | 5d56786 | 2011-12-24 09:12:00 -0600 | [diff] [blame] | 2226 | PNG_EXPORT(147, png_uint_32, png_get_pCAL, (png_const_structrp png_ptr, |
Glenn Randers-Pehrson | 871b1d0 | 2013-03-02 14:58:22 -0600 | [diff] [blame] | 2227 | png_inforp info_ptr, png_charp *purpose, png_int_32 *X0, |
John Bowler | 40b2603 | 2011-12-22 08:09:15 -0600 | [diff] [blame] | 2228 | png_int_32 *X1, int *type, int *nparams, png_charp *units, |
| 2229 | png_charpp *params)); |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame] | 2230 | #endif |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 2231 | |
Glenn Randers-Pehrson | 4e6b5e9 | 2009-09-23 10:24:53 -0500 | [diff] [blame] | 2232 | #ifdef PNG_pCAL_SUPPORTED |
John Bowler | 4f67e40 | 2011-12-28 08:43:37 -0600 | [diff] [blame] | 2233 | PNG_EXPORT(148, void, png_set_pCAL, (png_const_structrp png_ptr, |
| 2234 | png_inforp info_ptr, png_const_charp purpose, png_int_32 X0, png_int_32 X1, |
| 2235 | int type, int nparams, png_const_charp units, png_charpp params)); |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame] | 2236 | #endif |
| 2237 | |
Glenn Randers-Pehrson | 4e6b5e9 | 2009-09-23 10:24:53 -0500 | [diff] [blame] | 2238 | #ifdef PNG_pHYs_SUPPORTED |
John Bowler | 5d56786 | 2011-12-24 09:12:00 -0600 | [diff] [blame] | 2239 | PNG_EXPORT(149, png_uint_32, png_get_pHYs, (png_const_structrp png_ptr, |
| 2240 | png_const_inforp info_ptr, png_uint_32 *res_x, png_uint_32 *res_y, |
John Bowler | 40b2603 | 2011-12-22 08:09:15 -0600 | [diff] [blame] | 2241 | int *unit_type)); |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame] | 2242 | #endif |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 2243 | |
Glenn Randers-Pehrson | 4e6b5e9 | 2009-09-23 10:24:53 -0500 | [diff] [blame] | 2244 | #ifdef PNG_pHYs_SUPPORTED |
John Bowler | 4f67e40 | 2011-12-28 08:43:37 -0600 | [diff] [blame] | 2245 | PNG_EXPORT(150, void, png_set_pHYs, (png_const_structrp png_ptr, |
| 2246 | png_inforp 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] | 2247 | #endif |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 2248 | |
John Bowler | 5d56786 | 2011-12-24 09:12:00 -0600 | [diff] [blame] | 2249 | PNG_EXPORT(151, png_uint_32, png_get_PLTE, (png_const_structrp png_ptr, |
Glenn Randers-Pehrson | 871b1d0 | 2013-03-02 14:58:22 -0600 | [diff] [blame] | 2250 | png_inforp info_ptr, png_colorp *palette, int *num_palette)); |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 2251 | |
John Bowler | 4f67e40 | 2011-12-28 08:43:37 -0600 | [diff] [blame] | 2252 | PNG_EXPORT(152, void, png_set_PLTE, (png_structrp png_ptr, |
| 2253 | png_inforp info_ptr, png_const_colorp palette, int num_palette)); |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 2254 | |
Glenn Randers-Pehrson | 4e6b5e9 | 2009-09-23 10:24:53 -0500 | [diff] [blame] | 2255 | #ifdef PNG_sBIT_SUPPORTED |
John Bowler | 5d56786 | 2011-12-24 09:12:00 -0600 | [diff] [blame] | 2256 | PNG_EXPORT(153, png_uint_32, png_get_sBIT, (png_const_structrp png_ptr, |
| 2257 | png_inforp info_ptr, png_color_8p *sig_bit)); |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame] | 2258 | #endif |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 2259 | |
Glenn Randers-Pehrson | 4e6b5e9 | 2009-09-23 10:24:53 -0500 | [diff] [blame] | 2260 | #ifdef PNG_sBIT_SUPPORTED |
John Bowler | 4f67e40 | 2011-12-28 08:43:37 -0600 | [diff] [blame] | 2261 | PNG_EXPORT(154, void, png_set_sBIT, (png_const_structrp png_ptr, |
| 2262 | png_inforp info_ptr, png_const_color_8p sig_bit)); |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame] | 2263 | #endif |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 2264 | |
Glenn Randers-Pehrson | 4e6b5e9 | 2009-09-23 10:24:53 -0500 | [diff] [blame] | 2265 | #ifdef PNG_sRGB_SUPPORTED |
John Bowler | 5d56786 | 2011-12-24 09:12:00 -0600 | [diff] [blame] | 2266 | PNG_EXPORT(155, png_uint_32, png_get_sRGB, (png_const_structrp png_ptr, |
| 2267 | png_const_inforp info_ptr, int *file_srgb_intent)); |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame] | 2268 | #endif |
Glenn Randers-Pehrson | b6ce43d | 1998-01-01 07:13:13 -0600 | [diff] [blame] | 2269 | |
Glenn Randers-Pehrson | 4e6b5e9 | 2009-09-23 10:24:53 -0500 | [diff] [blame] | 2270 | #ifdef PNG_sRGB_SUPPORTED |
John Bowler | 4f67e40 | 2011-12-28 08:43:37 -0600 | [diff] [blame] | 2271 | PNG_EXPORT(156, void, png_set_sRGB, (png_const_structrp png_ptr, |
| 2272 | png_inforp info_ptr, int srgb_intent)); |
| 2273 | PNG_EXPORT(157, void, png_set_sRGB_gAMA_and_cHRM, (png_const_structrp png_ptr, |
John Bowler | 5d56786 | 2011-12-24 09:12:00 -0600 | [diff] [blame] | 2274 | png_inforp info_ptr, int srgb_intent)); |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame] | 2275 | #endif |
Glenn Randers-Pehrson | b6ce43d | 1998-01-01 07:13:13 -0600 | [diff] [blame] | 2276 | |
Glenn Randers-Pehrson | 4e6b5e9 | 2009-09-23 10:24:53 -0500 | [diff] [blame] | 2277 | #ifdef PNG_iCCP_SUPPORTED |
John Bowler | 5d56786 | 2011-12-24 09:12:00 -0600 | [diff] [blame] | 2278 | PNG_EXPORT(158, png_uint_32, png_get_iCCP, (png_const_structrp png_ptr, |
Glenn Randers-Pehrson | 871b1d0 | 2013-03-02 14:58:22 -0600 | [diff] [blame] | 2279 | png_inforp info_ptr, png_charpp name, int *compression_type, |
John Bowler | 40b2603 | 2011-12-22 08:09:15 -0600 | [diff] [blame] | 2280 | png_bytepp profile, png_uint_32 *proflen)); |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame] | 2281 | #endif |
| 2282 | |
Glenn Randers-Pehrson | 4e6b5e9 | 2009-09-23 10:24:53 -0500 | [diff] [blame] | 2283 | #ifdef PNG_iCCP_SUPPORTED |
John Bowler | 4f67e40 | 2011-12-28 08:43:37 -0600 | [diff] [blame] | 2284 | PNG_EXPORT(159, void, png_set_iCCP, (png_const_structrp png_ptr, |
| 2285 | png_inforp info_ptr, png_const_charp name, int compression_type, |
| 2286 | png_const_bytep profile, png_uint_32 proflen)); |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame] | 2287 | #endif |
| 2288 | |
Glenn Randers-Pehrson | 4e6b5e9 | 2009-09-23 10:24:53 -0500 | [diff] [blame] | 2289 | #ifdef PNG_sPLT_SUPPORTED |
Glenn Randers-Pehrson | 871b1d0 | 2013-03-02 14:58:22 -0600 | [diff] [blame] | 2290 | PNG_EXPORT(160, int, png_get_sPLT, (png_const_structrp png_ptr, |
| 2291 | png_inforp info_ptr, png_sPLT_tpp entries)); |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame] | 2292 | #endif |
| 2293 | |
Glenn Randers-Pehrson | 4e6b5e9 | 2009-09-23 10:24:53 -0500 | [diff] [blame] | 2294 | #ifdef PNG_sPLT_SUPPORTED |
John Bowler | 4f67e40 | 2011-12-28 08:43:37 -0600 | [diff] [blame] | 2295 | PNG_EXPORT(161, void, png_set_sPLT, (png_const_structrp png_ptr, |
| 2296 | png_inforp info_ptr, png_const_sPLT_tp entries, int nentries)); |
Glenn Randers-Pehrson | 61c32d9 | 2000-02-04 23:40:16 -0600 | [diff] [blame] | 2297 | #endif |
| 2298 | |
Glenn Randers-Pehrson | 4e6b5e9 | 2009-09-23 10:24:53 -0500 | [diff] [blame] | 2299 | #ifdef PNG_TEXT_SUPPORTED |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame] | 2300 | /* png_get_text also returns the number of text chunks in *num_text */ |
Glenn Randers-Pehrson | 871b1d0 | 2013-03-02 14:58:22 -0600 | [diff] [blame] | 2301 | PNG_EXPORT(162, int, png_get_text, (png_const_structrp png_ptr, |
| 2302 | png_inforp info_ptr, png_textp *text_ptr, int *num_text)); |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame] | 2303 | #endif |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 2304 | |
Glenn Randers-Pehrson | c36bb79 | 2011-02-12 09:49:07 -0600 | [diff] [blame] | 2305 | /* Note while png_set_text() will accept a structure whose text, |
Glenn Randers-Pehrson | 6c7a09a | 2009-06-15 21:57:39 -0500 | [diff] [blame] | 2306 | * language, and translated keywords are NULL pointers, the structure |
| 2307 | * returned by png_get_text will always contain regular |
| 2308 | * zero-terminated C strings. They might be empty strings but |
| 2309 | * they will never be NULL pointers. |
Glenn Randers-Pehrson | 4accabb | 2000-04-14 14:20:47 -0500 | [diff] [blame] | 2310 | */ |
| 2311 | |
Glenn Randers-Pehrson | 4e6b5e9 | 2009-09-23 10:24:53 -0500 | [diff] [blame] | 2312 | #ifdef PNG_TEXT_SUPPORTED |
John Bowler | 4f67e40 | 2011-12-28 08:43:37 -0600 | [diff] [blame] | 2313 | PNG_EXPORT(163, void, png_set_text, (png_const_structrp png_ptr, |
| 2314 | png_inforp info_ptr, png_const_textp text_ptr, int num_text)); |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame] | 2315 | #endif |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 2316 | |
Glenn Randers-Pehrson | 4e6b5e9 | 2009-09-23 10:24:53 -0500 | [diff] [blame] | 2317 | #ifdef PNG_tIME_SUPPORTED |
John Bowler | 5d56786 | 2011-12-24 09:12:00 -0600 | [diff] [blame] | 2318 | PNG_EXPORT(164, png_uint_32, png_get_tIME, (png_const_structrp png_ptr, |
| 2319 | png_inforp info_ptr, png_timep *mod_time)); |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame] | 2320 | #endif |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 2321 | |
Glenn Randers-Pehrson | 4e6b5e9 | 2009-09-23 10:24:53 -0500 | [diff] [blame] | 2322 | #ifdef PNG_tIME_SUPPORTED |
John Bowler | 4f67e40 | 2011-12-28 08:43:37 -0600 | [diff] [blame] | 2323 | PNG_EXPORT(165, void, png_set_tIME, (png_const_structrp png_ptr, |
| 2324 | png_inforp info_ptr, png_const_timep mod_time)); |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame] | 2325 | #endif |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 2326 | |
Glenn Randers-Pehrson | 4e6b5e9 | 2009-09-23 10:24:53 -0500 | [diff] [blame] | 2327 | #ifdef PNG_tRNS_SUPPORTED |
John Bowler | 5d56786 | 2011-12-24 09:12:00 -0600 | [diff] [blame] | 2328 | PNG_EXPORT(166, png_uint_32, png_get_tRNS, (png_const_structrp png_ptr, |
| 2329 | png_inforp info_ptr, png_bytep *trans_alpha, int *num_trans, |
John Bowler | 40b2603 | 2011-12-22 08:09:15 -0600 | [diff] [blame] | 2330 | png_color_16p *trans_color)); |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame] | 2331 | #endif |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 2332 | |
Glenn Randers-Pehrson | 4e6b5e9 | 2009-09-23 10:24:53 -0500 | [diff] [blame] | 2333 | #ifdef PNG_tRNS_SUPPORTED |
John Bowler | 4f67e40 | 2011-12-28 08:43:37 -0600 | [diff] [blame] | 2334 | PNG_EXPORT(167, void, png_set_tRNS, (png_structrp png_ptr, |
| 2335 | png_inforp info_ptr, png_const_bytep trans_alpha, int num_trans, |
Glenn Randers-Pehrson | 23d3970 | 2010-12-06 18:28:02 -0600 | [diff] [blame] | 2336 | png_const_color_16p trans_color)); |
Glenn Randers-Pehrson | 61c32d9 | 2000-02-04 23:40:16 -0600 | [diff] [blame] | 2337 | #endif |
| 2338 | |
Glenn Randers-Pehrson | 4e6b5e9 | 2009-09-23 10:24:53 -0500 | [diff] [blame] | 2339 | #ifdef PNG_sCAL_SUPPORTED |
John Bowler | 5d56786 | 2011-12-24 09:12:00 -0600 | [diff] [blame] | 2340 | PNG_FP_EXPORT(168, png_uint_32, png_get_sCAL, (png_const_structrp png_ptr, |
Glenn Randers-Pehrson | 871b1d0 | 2013-03-02 14:58:22 -0600 | [diff] [blame] | 2341 | png_const_inforp info_ptr, int *unit, double *width, double *height)) |
| 2342 | #if defined(PNG_FLOATING_ARITHMETIC_SUPPORTED) || \ |
| 2343 | defined(PNG_FLOATING_POINT_SUPPORTED) |
Glenn Randers-Pehrson | c36bb79 | 2011-02-12 09:49:07 -0600 | [diff] [blame] | 2344 | /* NOTE: this API is currently implemented using floating point arithmetic, |
Glenn Randers-Pehrson | 48dc6eb | 2010-07-31 07:09:58 -0500 | [diff] [blame] | 2345 | * consequently it can only be used on systems with floating point support. |
| 2346 | * In any case the range of values supported by png_fixed_point is small and it |
| 2347 | * is highly recommended that png_get_sCAL_s be used instead. |
| 2348 | */ |
Glenn Randers-Pehrson | b86b492 | 2011-01-21 23:12:51 -0600 | [diff] [blame] | 2349 | PNG_FIXED_EXPORT(214, png_uint_32, png_get_sCAL_fixed, |
John Bowler | 5d56786 | 2011-12-24 09:12:00 -0600 | [diff] [blame] | 2350 | (png_const_structrp png_ptr, png_const_inforp info_ptr, int *unit, |
Glenn Randers-Pehrson | 871b1d0 | 2013-03-02 14:58:22 -0600 | [diff] [blame] | 2351 | png_fixed_point *width, png_fixed_point *height)) |
Glenn Randers-Pehrson | 48dc6eb | 2010-07-31 07:09:58 -0500 | [diff] [blame] | 2352 | #endif |
Glenn Randers-Pehrson | 23d3970 | 2010-12-06 18:28:02 -0600 | [diff] [blame] | 2353 | PNG_EXPORT(169, png_uint_32, png_get_sCAL_s, |
John Bowler | 5d56786 | 2011-12-24 09:12:00 -0600 | [diff] [blame] | 2354 | (png_const_structrp png_ptr, png_const_inforp info_ptr, int *unit, |
John Bowler | 40b2603 | 2011-12-22 08:09:15 -0600 | [diff] [blame] | 2355 | png_charpp swidth, png_charpp sheight)); |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame] | 2356 | |
John Bowler | 4f67e40 | 2011-12-28 08:43:37 -0600 | [diff] [blame] | 2357 | PNG_FP_EXPORT(170, void, png_set_sCAL, (png_const_structrp png_ptr, |
Glenn Randers-Pehrson | 871b1d0 | 2013-03-02 14:58:22 -0600 | [diff] [blame] | 2358 | png_inforp info_ptr, int unit, double width, double height)) |
John Bowler | 4f67e40 | 2011-12-28 08:43:37 -0600 | [diff] [blame] | 2359 | PNG_FIXED_EXPORT(213, void, png_set_sCAL_fixed, (png_const_structrp png_ptr, |
John Bowler | 5d56786 | 2011-12-24 09:12:00 -0600 | [diff] [blame] | 2360 | png_inforp info_ptr, int unit, png_fixed_point width, |
Glenn Randers-Pehrson | 871b1d0 | 2013-03-02 14:58:22 -0600 | [diff] [blame] | 2361 | png_fixed_point height)) |
John Bowler | 4f67e40 | 2011-12-28 08:43:37 -0600 | [diff] [blame] | 2362 | PNG_EXPORT(171, void, png_set_sCAL_s, (png_const_structrp png_ptr, |
| 2363 | png_inforp info_ptr, int unit, |
| 2364 | png_const_charp swidth, png_const_charp sheight)); |
Glenn Randers-Pehrson | 31aee0d | 2010-07-29 17:39:14 -0500 | [diff] [blame] | 2365 | #endif /* PNG_sCAL_SUPPORTED */ |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame] | 2366 | |
Glenn Randers-Pehrson | 871b1d0 | 2013-03-02 14:58:22 -0600 | [diff] [blame] | 2367 | #ifdef PNG_SET_UNKNOWN_CHUNKS_SUPPORTED |
| 2368 | /* Provide the default handling for all unknown chunks or, optionally, for |
| 2369 | * specific unknown chunks. |
| 2370 | * |
| 2371 | * NOTE: prior to 1.6.0 the handling specified for particular chunks on read was |
| 2372 | * ignored and the default was used, the per-chunk setting only had an effect on |
| 2373 | * write. If you wish to have chunk-specific handling on read in code that must |
| 2374 | * work on earlier versions you must use a user chunk callback to specify the |
| 2375 | * desired handling (keep or discard.) |
| 2376 | * |
| 2377 | * The 'keep' parameter is a PNG_HANDLE_CHUNK_ value as listed below. The |
| 2378 | * parameter is interpreted as follows: |
| 2379 | * |
| 2380 | * READ: |
| 2381 | * PNG_HANDLE_CHUNK_AS_DEFAULT: |
| 2382 | * Known chunks: do normal libpng processing, do not keep the chunk (but |
| 2383 | * see the comments below about PNG_HANDLE_AS_UNKNOWN_SUPPORTED) |
| 2384 | * Unknown chunks: for a specific chunk use the global default, when used |
| 2385 | * as the default discard the chunk data. |
| 2386 | * PNG_HANDLE_CHUNK_NEVER: |
| 2387 | * Discard the chunk data. |
| 2388 | * PNG_HANDLE_CHUNK_IF_SAFE: |
| 2389 | * Keep the chunk data if the chunk is not critical else raise a chunk |
| 2390 | * error. |
| 2391 | * PNG_HANDLE_CHUNK_ALWAYS: |
| 2392 | * Keep the chunk data. |
| 2393 | * |
| 2394 | * If the chunk data is saved it can be retrieved using png_get_unknown_chunks, |
| 2395 | * below. Notice that specifying "AS_DEFAULT" as a global default is equivalent |
| 2396 | * to specifying "NEVER", however when "AS_DEFAULT" is used for specific chunks |
| 2397 | * it simply resets the behavior to the libpng default. |
| 2398 | * |
John Bowler | e15b537 | 2013-03-02 17:59:43 -0600 | [diff] [blame] | 2399 | * INTERACTION WTIH USER CHUNK CALLBACKS: |
Glenn Randers-Pehrson | 871b1d0 | 2013-03-02 14:58:22 -0600 | [diff] [blame] | 2400 | * The per-chunk handling is always used when there is a png_user_chunk_ptr |
| 2401 | * callback and the callback returns 0; the chunk is then always stored *unless* |
| 2402 | * it is critical and the per-chunk setting is other than ALWAYS. Notice that |
| 2403 | * the global default is *not* used in this case. (In effect the per-chunk |
| 2404 | * value is incremented to at least IF_SAFE.) |
| 2405 | * |
John Bowler | e15b537 | 2013-03-02 17:59:43 -0600 | [diff] [blame] | 2406 | * IMPORTANT NOTE: this behavior will change in libpng 1.7 - the global and |
| 2407 | * per-chunk defaults will be honored. If you want to preserve the current |
| 2408 | * behavior when your callback returns 0 you must set PNG_HANDLE_CHUNK_IF_SAFE |
| 2409 | * as the default - if you don't do this libpng 1.6 will issue a warning. |
| 2410 | * |
| 2411 | * If you want unhandled unknown chunks to be discarded in libpng 1.6 and |
| 2412 | * earlier simply return '1' (handled). |
| 2413 | * |
Glenn Randers-Pehrson | 871b1d0 | 2013-03-02 14:58:22 -0600 | [diff] [blame] | 2414 | * PNG_HANDLE_AS_UNKNOWN_SUPPORTED: |
| 2415 | * If this is *not* set known chunks will always be handled by libpng and |
| 2416 | * will never be stored in the unknown chunk list. Known chunks listed to |
| 2417 | * png_set_keep_unknown_chunks will have no effect. If it is set then known |
| 2418 | * chunks listed with a keep other than AS_DEFAULT will *never* be processed |
| 2419 | * by libpng, in addition critical chunks must either be processed by the |
| 2420 | * callback or saved. |
| 2421 | * |
| 2422 | * The IHDR and IEND chunks must not be listed. Because this turns off the |
| 2423 | * default handling for chunks that would otherwise be recognized the |
| 2424 | * behavior of libpng transformations may well become incorrect! |
| 2425 | * |
| 2426 | * WRITE: |
| 2427 | * When writing chunks the options only apply to the chunks specified by |
| 2428 | * png_set_unknown_chunks (below), libpng will *always* write known chunks |
| 2429 | * required by png_set_ calls and will always write the core critical chunks |
| 2430 | * (as required for PLTE). |
| 2431 | * |
| 2432 | * Each chunk in the png_set_unknown_chunks list is looked up in the |
| 2433 | * png_set_keep_unknown_chunks list to find the keep setting, this is then |
| 2434 | * interpreted as follows: |
| 2435 | * |
| 2436 | * PNG_HANDLE_CHUNK_AS_DEFAULT: |
| 2437 | * Write safe-to-copy chunks and write other chunks if the global |
| 2438 | * default is set to _ALWAYS, otherwise don't write this chunk. |
| 2439 | * PNG_HANDLE_CHUNK_NEVER: |
| 2440 | * Do not write the chunk. |
| 2441 | * PNG_HANDLE_CHUNK_IF_SAFE: |
| 2442 | * Write the chunk if it is safe-to-copy, otherwise do not write it. |
| 2443 | * PNG_HANDLE_CHUNK_ALWAYS: |
| 2444 | * Write the chunk. |
| 2445 | * |
| 2446 | * Note that the default behavior is effectively the opposite of the read case - |
| 2447 | * in read unknown chunks are not stored by default, in write they are written |
| 2448 | * by default. Also the behavior of PNG_HANDLE_CHUNK_IF_SAFE is very different |
| 2449 | * - on write the safe-to-copy bit is checked, on read the critical bit is |
| 2450 | * checked and on read if the chunk is critical an error will be raised. |
| 2451 | * |
| 2452 | * num_chunks: |
| 2453 | * =========== |
| 2454 | * If num_chunks is positive, then the "keep" parameter specifies the manner |
| 2455 | * for handling only those chunks appearing in the chunk_list array, |
| 2456 | * otherwise the chunk list array is ignored. |
| 2457 | * |
| 2458 | * If num_chunks is 0 the "keep" parameter specifies the default behavior for |
| 2459 | * unknown chunks, as described above. |
| 2460 | * |
| 2461 | * If num_chunks is negative, then the "keep" parameter specifies the manner |
| 2462 | * for handling all unknown chunks plus all chunks recognized by libpng |
| 2463 | * except for the IHDR, PLTE, tRNS, IDAT, and IEND chunks (which continue to |
| 2464 | * be processed by libpng. |
| 2465 | */ |
John Bowler | 5d56786 | 2011-12-24 09:12:00 -0600 | [diff] [blame] | 2466 | PNG_EXPORT(172, void, png_set_keep_unknown_chunks, (png_structrp png_ptr, |
John Bowler | 40b2603 | 2011-12-22 08:09:15 -0600 | [diff] [blame] | 2467 | int keep, png_const_bytep chunk_list, int num_chunks)); |
Glenn Randers-Pehrson | bb5cb14 | 2011-09-22 12:41:58 -0500 | [diff] [blame] | 2468 | |
Glenn Randers-Pehrson | 871b1d0 | 2013-03-02 14:58:22 -0600 | [diff] [blame] | 2469 | /* The "keep" PNG_HANDLE_CHUNK_ parameter for the specified chunk is returned; |
| 2470 | * the result is therefore true (non-zero) if special handling is required, |
| 2471 | * false for the default handling. |
Glenn Randers-Pehrson | bb5cb14 | 2011-09-22 12:41:58 -0500 | [diff] [blame] | 2472 | */ |
Glenn Randers-Pehrson | 871b1d0 | 2013-03-02 14:58:22 -0600 | [diff] [blame] | 2473 | PNG_EXPORT(173, int, png_handle_as_unknown, (png_const_structrp png_ptr, |
Glenn Randers-Pehrson | 23d3970 | 2010-12-06 18:28:02 -0600 | [diff] [blame] | 2474 | png_const_bytep chunk_name)); |
Glenn Randers-Pehrson | 7824a70 | 2009-06-13 10:05:05 -0500 | [diff] [blame] | 2475 | #endif |
Glenn Randers-Pehrson | 871b1d0 | 2013-03-02 14:58:22 -0600 | [diff] [blame] | 2476 | |
| 2477 | #ifdef PNG_STORE_UNKNOWN_CHUNKS_SUPPORTED |
John Bowler | 4f67e40 | 2011-12-28 08:43:37 -0600 | [diff] [blame] | 2478 | PNG_EXPORT(174, void, png_set_unknown_chunks, (png_const_structrp png_ptr, |
John Bowler | 5d56786 | 2011-12-24 09:12:00 -0600 | [diff] [blame] | 2479 | png_inforp info_ptr, png_const_unknown_chunkp unknowns, |
Glenn Randers-Pehrson | b86b492 | 2011-01-21 23:12:51 -0600 | [diff] [blame] | 2480 | int num_unknowns)); |
Glenn Randers-Pehrson | 871b1d0 | 2013-03-02 14:58:22 -0600 | [diff] [blame] | 2481 | /* NOTE: prior to 1.6.0 this routine set the 'location' field of the added |
| 2482 | * unknowns to the location currently stored in the png_struct. This is |
| 2483 | * invariably the wrong value on write. To fix this call the following API |
| 2484 | * for each chunk in the list with the correct location. If you know your |
| 2485 | * code won't be compiled on earlier versions you can rely on |
| 2486 | * png_set_unknown_chunks(write-ptr, png_get_unknown_chunks(read-ptr)) doing |
| 2487 | * the correct thing. |
| 2488 | */ |
| 2489 | |
John Bowler | 4f67e40 | 2011-12-28 08:43:37 -0600 | [diff] [blame] | 2490 | PNG_EXPORT(175, void, png_set_unknown_chunk_location, |
| 2491 | (png_const_structrp png_ptr, png_inforp info_ptr, int chunk, int location)); |
Glenn Randers-Pehrson | 871b1d0 | 2013-03-02 14:58:22 -0600 | [diff] [blame] | 2492 | |
John Bowler | 5d56786 | 2011-12-24 09:12:00 -0600 | [diff] [blame] | 2493 | PNG_EXPORT(176, int, png_get_unknown_chunks, (png_const_structrp png_ptr, |
Glenn Randers-Pehrson | 871b1d0 | 2013-03-02 14:58:22 -0600 | [diff] [blame] | 2494 | png_inforp info_ptr, png_unknown_chunkpp entries)); |
Glenn Randers-Pehrson | 61c32d9 | 2000-02-04 23:40:16 -0600 | [diff] [blame] | 2495 | #endif |
| 2496 | |
Glenn Randers-Pehrson | fc4a143 | 2000-05-17 17:39:34 -0500 | [diff] [blame] | 2497 | /* Png_free_data() will turn off the "valid" flag for anything it frees. |
Glenn Randers-Pehrson | c36bb79 | 2011-02-12 09:49:07 -0600 | [diff] [blame] | 2498 | * If you need to turn it off for a chunk that your application has freed, |
Glenn Randers-Pehrson | 6c7a09a | 2009-06-15 21:57:39 -0500 | [diff] [blame] | 2499 | * you can use png_set_invalid(png_ptr, info_ptr, PNG_INFO_CHNK); |
| 2500 | */ |
John Bowler | 5d56786 | 2011-12-24 09:12:00 -0600 | [diff] [blame] | 2501 | PNG_EXPORT(177, void, png_set_invalid, (png_const_structrp png_ptr, |
| 2502 | png_inforp info_ptr, int mask)); |
Glenn Randers-Pehrson | 871b1d0 | 2013-03-02 14:58:22 -0600 | [diff] [blame] | 2503 | |
Glenn Randers-Pehrson | 4e6b5e9 | 2009-09-23 10:24:53 -0500 | [diff] [blame] | 2504 | #ifdef PNG_INFO_IMAGE_SUPPORTED |
Glenn Randers-Pehrson | 6942d53 | 2000-05-01 09:31:54 -0500 | [diff] [blame] | 2505 | /* The "params" pointer is currently not used and is for future expansion. */ |
John Bowler | 5d56786 | 2011-12-24 09:12:00 -0600 | [diff] [blame] | 2506 | PNG_EXPORT(178, void, png_read_png, (png_structrp png_ptr, png_inforp info_ptr, |
Glenn Randers-Pehrson | 23d3970 | 2010-12-06 18:28:02 -0600 | [diff] [blame] | 2507 | int transforms, png_voidp params)); |
John Bowler | 5d56786 | 2011-12-24 09:12:00 -0600 | [diff] [blame] | 2508 | PNG_EXPORT(179, void, png_write_png, (png_structrp png_ptr, png_inforp info_ptr, |
Glenn Randers-Pehrson | 23d3970 | 2010-12-06 18:28:02 -0600 | [diff] [blame] | 2509 | int transforms, png_voidp params)); |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame] | 2510 | #endif |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 2511 | |
Glenn Randers-Pehrson | b86b492 | 2011-01-21 23:12:51 -0600 | [diff] [blame] | 2512 | PNG_EXPORT(180, png_const_charp, png_get_copyright, |
John Bowler | 5d56786 | 2011-12-24 09:12:00 -0600 | [diff] [blame] | 2513 | (png_const_structrp png_ptr)); |
Glenn Randers-Pehrson | b86b492 | 2011-01-21 23:12:51 -0600 | [diff] [blame] | 2514 | PNG_EXPORT(181, png_const_charp, png_get_header_ver, |
John Bowler | 5d56786 | 2011-12-24 09:12:00 -0600 | [diff] [blame] | 2515 | (png_const_structrp png_ptr)); |
Glenn Randers-Pehrson | b86b492 | 2011-01-21 23:12:51 -0600 | [diff] [blame] | 2516 | PNG_EXPORT(182, png_const_charp, png_get_header_version, |
John Bowler | 5d56786 | 2011-12-24 09:12:00 -0600 | [diff] [blame] | 2517 | (png_const_structrp png_ptr)); |
Glenn Randers-Pehrson | b86b492 | 2011-01-21 23:12:51 -0600 | [diff] [blame] | 2518 | PNG_EXPORT(183, png_const_charp, png_get_libpng_ver, |
John Bowler | 5d56786 | 2011-12-24 09:12:00 -0600 | [diff] [blame] | 2519 | (png_const_structrp png_ptr)); |
Glenn Randers-Pehrson | c944229 | 1999-01-06 21:50:16 -0600 | [diff] [blame] | 2520 | |
Glenn Randers-Pehrson | 5e5c1e1 | 2000-11-10 12:26:19 -0600 | [diff] [blame] | 2521 | #ifdef PNG_MNG_FEATURES_SUPPORTED |
John Bowler | 5d56786 | 2011-12-24 09:12:00 -0600 | [diff] [blame] | 2522 | PNG_EXPORT(184, png_uint_32, png_permit_mng_features, (png_structrp png_ptr, |
Glenn Randers-Pehrson | 23d3970 | 2010-12-06 18:28:02 -0600 | [diff] [blame] | 2523 | png_uint_32 mng_features_permitted)); |
Glenn Randers-Pehrson | 5e5c1e1 | 2000-11-10 12:26:19 -0600 | [diff] [blame] | 2524 | #endif |
| 2525 | |
Glenn Randers-Pehrson | 8f3dd83 | 2004-08-10 09:43:42 -0500 | [diff] [blame] | 2526 | /* For use in png_set_keep_unknown, added to version 1.2.6 */ |
| 2527 | #define PNG_HANDLE_CHUNK_AS_DEFAULT 0 |
| 2528 | #define PNG_HANDLE_CHUNK_NEVER 1 |
| 2529 | #define PNG_HANDLE_CHUNK_IF_SAFE 2 |
| 2530 | #define PNG_HANDLE_CHUNK_ALWAYS 3 |
Glenn Randers-Pehrson | 871b1d0 | 2013-03-02 14:58:22 -0600 | [diff] [blame] | 2531 | #define PNG_HANDLE_CHUNK_LAST 4 |
Glenn Randers-Pehrson | 8f3dd83 | 2004-08-10 09:43:42 -0500 | [diff] [blame] | 2532 | |
Glenn Randers-Pehrson | e68f5a3 | 2001-05-14 09:20:53 -0500 | [diff] [blame] | 2533 | /* Strip the prepended error numbers ("#nnn ") from error and warning |
Glenn Randers-Pehrson | 6c7a09a | 2009-06-15 21:57:39 -0500 | [diff] [blame] | 2534 | * messages before passing them to the error or warning handler. |
| 2535 | */ |
Glenn Randers-Pehrson | e68f5a3 | 2001-05-14 09:20:53 -0500 | [diff] [blame] | 2536 | #ifdef PNG_ERROR_NUMBERS_SUPPORTED |
John Bowler | 5d56786 | 2011-12-24 09:12:00 -0600 | [diff] [blame] | 2537 | PNG_EXPORT(185, void, png_set_strip_error_numbers, (png_structrp png_ptr, |
Glenn Randers-Pehrson | 23d3970 | 2010-12-06 18:28:02 -0600 | [diff] [blame] | 2538 | png_uint_32 strip_mode)); |
Glenn Randers-Pehrson | be9de0f | 2001-01-22 08:52:16 -0600 | [diff] [blame] | 2539 | #endif |
Glenn Randers-Pehrson | 272489d | 2004-08-04 06:34:52 -0500 | [diff] [blame] | 2540 | |
Glenn Randers-Pehrson | beb572e | 2006-08-19 13:59:24 -0500 | [diff] [blame] | 2541 | /* Added in libpng-1.2.6 */ |
Glenn Randers-Pehrson | 272489d | 2004-08-04 06:34:52 -0500 | [diff] [blame] | 2542 | #ifdef PNG_SET_USER_LIMITS_SUPPORTED |
John Bowler | 5d56786 | 2011-12-24 09:12:00 -0600 | [diff] [blame] | 2543 | PNG_EXPORT(186, void, png_set_user_limits, (png_structrp png_ptr, |
Glenn Randers-Pehrson | 23d3970 | 2010-12-06 18:28:02 -0600 | [diff] [blame] | 2544 | png_uint_32 user_width_max, png_uint_32 user_height_max)); |
Glenn Randers-Pehrson | b86b492 | 2011-01-21 23:12:51 -0600 | [diff] [blame] | 2545 | PNG_EXPORT(187, png_uint_32, png_get_user_width_max, |
John Bowler | 5d56786 | 2011-12-24 09:12:00 -0600 | [diff] [blame] | 2546 | (png_const_structrp png_ptr)); |
Glenn Randers-Pehrson | b86b492 | 2011-01-21 23:12:51 -0600 | [diff] [blame] | 2547 | PNG_EXPORT(188, png_uint_32, png_get_user_height_max, |
John Bowler | 5d56786 | 2011-12-24 09:12:00 -0600 | [diff] [blame] | 2548 | (png_const_structrp png_ptr)); |
Glenn Randers-Pehrson | 800d1e9 | 2008-08-20 17:25:21 -0500 | [diff] [blame] | 2549 | /* Added in libpng-1.4.0 */ |
John Bowler | 5d56786 | 2011-12-24 09:12:00 -0600 | [diff] [blame] | 2550 | PNG_EXPORT(189, void, png_set_chunk_cache_max, (png_structrp png_ptr, |
Glenn Randers-Pehrson | 23d3970 | 2010-12-06 18:28:02 -0600 | [diff] [blame] | 2551 | png_uint_32 user_chunk_cache_max)); |
Glenn Randers-Pehrson | b86b492 | 2011-01-21 23:12:51 -0600 | [diff] [blame] | 2552 | PNG_EXPORT(190, png_uint_32, png_get_chunk_cache_max, |
John Bowler | 5d56786 | 2011-12-24 09:12:00 -0600 | [diff] [blame] | 2553 | (png_const_structrp png_ptr)); |
Glenn Randers-Pehrson | e3f3c4e | 2010-02-07 18:08:50 -0600 | [diff] [blame] | 2554 | /* Added in libpng-1.4.1 */ |
John Bowler | 5d56786 | 2011-12-24 09:12:00 -0600 | [diff] [blame] | 2555 | PNG_EXPORT(191, void, png_set_chunk_malloc_max, (png_structrp png_ptr, |
Glenn Randers-Pehrson | 23d3970 | 2010-12-06 18:28:02 -0600 | [diff] [blame] | 2556 | png_alloc_size_t user_chunk_cache_max)); |
| 2557 | PNG_EXPORT(192, png_alloc_size_t, png_get_chunk_malloc_max, |
John Bowler | 5d56786 | 2011-12-24 09:12:00 -0600 | [diff] [blame] | 2558 | (png_const_structrp png_ptr)); |
Glenn Randers-Pehrson | 272489d | 2004-08-04 06:34:52 -0500 | [diff] [blame] | 2559 | #endif |
| 2560 | |
Glenn Randers-Pehrson | 31aee0d | 2010-07-29 17:39:14 -0500 | [diff] [blame] | 2561 | #if defined(PNG_INCH_CONVERSIONS_SUPPORTED) |
Glenn Randers-Pehrson | b86b492 | 2011-01-21 23:12:51 -0600 | [diff] [blame] | 2562 | PNG_EXPORT(193, png_uint_32, png_get_pixels_per_inch, |
John Bowler | 5d56786 | 2011-12-24 09:12:00 -0600 | [diff] [blame] | 2563 | (png_const_structrp png_ptr, png_const_inforp info_ptr)); |
Glenn Randers-Pehrson | 6bc53be | 2006-06-16 07:52:03 -0500 | [diff] [blame] | 2564 | |
Glenn Randers-Pehrson | b86b492 | 2011-01-21 23:12:51 -0600 | [diff] [blame] | 2565 | PNG_EXPORT(194, png_uint_32, png_get_x_pixels_per_inch, |
John Bowler | 5d56786 | 2011-12-24 09:12:00 -0600 | [diff] [blame] | 2566 | (png_const_structrp png_ptr, png_const_inforp info_ptr)); |
Glenn Randers-Pehrson | 6bc53be | 2006-06-16 07:52:03 -0500 | [diff] [blame] | 2567 | |
Glenn Randers-Pehrson | b86b492 | 2011-01-21 23:12:51 -0600 | [diff] [blame] | 2568 | PNG_EXPORT(195, png_uint_32, png_get_y_pixels_per_inch, |
John Bowler | 5d56786 | 2011-12-24 09:12:00 -0600 | [diff] [blame] | 2569 | (png_const_structrp png_ptr, png_const_inforp info_ptr)); |
Glenn Randers-Pehrson | 6bc53be | 2006-06-16 07:52:03 -0500 | [diff] [blame] | 2570 | |
Glenn Randers-Pehrson | b86b492 | 2011-01-21 23:12:51 -0600 | [diff] [blame] | 2571 | PNG_FP_EXPORT(196, float, png_get_x_offset_inches, |
Glenn Randers-Pehrson | 871b1d0 | 2013-03-02 14:58:22 -0600 | [diff] [blame] | 2572 | (png_const_structrp png_ptr, png_const_inforp info_ptr)) |
Glenn Randers-Pehrson | 31aee0d | 2010-07-29 17:39:14 -0500 | [diff] [blame] | 2573 | #ifdef PNG_FIXED_POINT_SUPPORTED /* otherwise not implemented. */ |
Glenn Randers-Pehrson | c36bb79 | 2011-02-12 09:49:07 -0600 | [diff] [blame] | 2574 | PNG_FIXED_EXPORT(211, png_fixed_point, png_get_x_offset_inches_fixed, |
Glenn Randers-Pehrson | 871b1d0 | 2013-03-02 14:58:22 -0600 | [diff] [blame] | 2575 | (png_const_structrp png_ptr, png_const_inforp info_ptr)) |
Glenn Randers-Pehrson | 31aee0d | 2010-07-29 17:39:14 -0500 | [diff] [blame] | 2576 | #endif |
Glenn Randers-Pehrson | 6bc53be | 2006-06-16 07:52:03 -0500 | [diff] [blame] | 2577 | |
John Bowler | 5d56786 | 2011-12-24 09:12:00 -0600 | [diff] [blame] | 2578 | PNG_FP_EXPORT(197, float, png_get_y_offset_inches, (png_const_structrp png_ptr, |
Glenn Randers-Pehrson | 871b1d0 | 2013-03-02 14:58:22 -0600 | [diff] [blame] | 2579 | png_const_inforp info_ptr)) |
Glenn Randers-Pehrson | 31aee0d | 2010-07-29 17:39:14 -0500 | [diff] [blame] | 2580 | #ifdef PNG_FIXED_POINT_SUPPORTED /* otherwise not implemented. */ |
Glenn Randers-Pehrson | c36bb79 | 2011-02-12 09:49:07 -0600 | [diff] [blame] | 2581 | PNG_FIXED_EXPORT(212, png_fixed_point, png_get_y_offset_inches_fixed, |
Glenn Randers-Pehrson | 871b1d0 | 2013-03-02 14:58:22 -0600 | [diff] [blame] | 2582 | (png_const_structrp png_ptr, png_const_inforp info_ptr)) |
Glenn Randers-Pehrson | 31aee0d | 2010-07-29 17:39:14 -0500 | [diff] [blame] | 2583 | #endif |
Glenn Randers-Pehrson | 6bc53be | 2006-06-16 07:52:03 -0500 | [diff] [blame] | 2584 | |
Glenn Randers-Pehrson | d4df36c | 2010-03-06 10:45:55 -0600 | [diff] [blame] | 2585 | # ifdef PNG_pHYs_SUPPORTED |
John Bowler | 5d56786 | 2011-12-24 09:12:00 -0600 | [diff] [blame] | 2586 | PNG_EXPORT(198, png_uint_32, png_get_pHYs_dpi, (png_const_structrp png_ptr, |
| 2587 | png_const_inforp info_ptr, png_uint_32 *res_x, png_uint_32 *res_y, |
Glenn Randers-Pehrson | 23d3970 | 2010-12-06 18:28:02 -0600 | [diff] [blame] | 2588 | int *unit_type)); |
Glenn Randers-Pehrson | d4df36c | 2010-03-06 10:45:55 -0600 | [diff] [blame] | 2589 | # endif /* PNG_pHYs_SUPPORTED */ |
Glenn Randers-Pehrson | 31aee0d | 2010-07-29 17:39:14 -0500 | [diff] [blame] | 2590 | #endif /* PNG_INCH_CONVERSIONS_SUPPORTED */ |
Glenn Randers-Pehrson | 6bc53be | 2006-06-16 07:52:03 -0500 | [diff] [blame] | 2591 | |
Glenn Randers-Pehrson | beb572e | 2006-08-19 13:59:24 -0500 | [diff] [blame] | 2592 | /* Added in libpng-1.4.0 */ |
| 2593 | #ifdef PNG_IO_STATE_SUPPORTED |
John Bowler | 5d56786 | 2011-12-24 09:12:00 -0600 | [diff] [blame] | 2594 | PNG_EXPORT(199, png_uint_32, png_get_io_state, (png_const_structrp png_ptr)); |
Glenn Randers-Pehrson | beb572e | 2006-08-19 13:59:24 -0500 | [diff] [blame] | 2595 | |
John Bowler | 40b2603 | 2011-12-22 08:09:15 -0600 | [diff] [blame] | 2596 | /* Removed from libpng 1.6; use png_get_io_chunk_type. */ |
John Bowler | 5d56786 | 2011-12-24 09:12:00 -0600 | [diff] [blame] | 2597 | PNG_REMOVED(200, png_const_bytep, png_get_io_chunk_name, (png_structrp png_ptr), |
John Bowler | 40b2603 | 2011-12-22 08:09:15 -0600 | [diff] [blame] | 2598 | PNG_DEPRECATED) |
| 2599 | |
Glenn Randers-Pehrson | cf7cce6 | 2011-01-22 12:42:43 -0600 | [diff] [blame] | 2600 | PNG_EXPORT(216, png_uint_32, png_get_io_chunk_type, |
John Bowler | 5d56786 | 2011-12-24 09:12:00 -0600 | [diff] [blame] | 2601 | (png_const_structrp png_ptr)); |
Glenn Randers-Pehrson | beb572e | 2006-08-19 13:59:24 -0500 | [diff] [blame] | 2602 | |
| 2603 | /* The flags returned by png_get_io_state() are the following: */ |
Glenn Randers-Pehrson | d4df36c | 2010-03-06 10:45:55 -0600 | [diff] [blame] | 2604 | # define PNG_IO_NONE 0x0000 /* no I/O at this moment */ |
| 2605 | # define PNG_IO_READING 0x0001 /* currently reading */ |
| 2606 | # define PNG_IO_WRITING 0x0002 /* currently writing */ |
| 2607 | # define PNG_IO_SIGNATURE 0x0010 /* currently at the file signature */ |
| 2608 | # define PNG_IO_CHUNK_HDR 0x0020 /* currently at the chunk header */ |
| 2609 | # define PNG_IO_CHUNK_DATA 0x0040 /* currently at the chunk data */ |
| 2610 | # define PNG_IO_CHUNK_CRC 0x0080 /* currently at the chunk crc */ |
| 2611 | # define PNG_IO_MASK_OP 0x000f /* current operation: reading/writing */ |
| 2612 | # define PNG_IO_MASK_LOC 0x00f0 /* current location: sig/hdr/data/crc */ |
Glenn Randers-Pehrson | beb572e | 2006-08-19 13:59:24 -0500 | [diff] [blame] | 2613 | #endif /* ?PNG_IO_STATE_SUPPORTED */ |
| 2614 | |
John Bowler | 660c6e4 | 2010-12-19 06:22:23 -0600 | [diff] [blame] | 2615 | /* Interlace support. The following macros are always defined so that if |
| 2616 | * libpng interlace handling is turned off the macros may be used to handle |
| 2617 | * interlaced images within the application. |
| 2618 | */ |
| 2619 | #define PNG_INTERLACE_ADAM7_PASSES 7 |
| 2620 | |
| 2621 | /* Two macros to return the first row and first column of the original, |
| 2622 | * full, image which appears in a given pass. 'pass' is in the range 0 |
| 2623 | * to 6 and the result is in the range 0 to 7. |
| 2624 | */ |
John Bowler | 4e68aa7 | 2011-10-11 16:01:33 -0500 | [diff] [blame] | 2625 | #define PNG_PASS_START_ROW(pass) (((1&~(pass))<<(3-((pass)>>1)))&7) |
| 2626 | #define PNG_PASS_START_COL(pass) (((1& (pass))<<(3-(((pass)+1)>>1)))&7) |
| 2627 | |
| 2628 | /* A macro to return the offset between pixels in the output row for a pair of |
| 2629 | * pixels in the input - effectively the inverse of the 'COL_SHIFT' macro that |
| 2630 | * follows. Note that ROW_OFFSET is the offset from one row to the next whereas |
| 2631 | * COL_OFFSET is from one column to the next, within a row. |
| 2632 | */ |
| 2633 | #define PNG_PASS_ROW_OFFSET(pass) ((pass)>2?(8>>(((pass)-1)>>1)):8) |
| 2634 | #define PNG_PASS_COL_OFFSET(pass) (1<<((7-(pass))>>1)) |
John Bowler | 660c6e4 | 2010-12-19 06:22:23 -0600 | [diff] [blame] | 2635 | |
| 2636 | /* Two macros to help evaluate the number of rows or columns in each |
| 2637 | * pass. This is expressed as a shift - effectively log2 of the number or |
| 2638 | * rows or columns in each 8x8 tile of the original image. |
| 2639 | */ |
| 2640 | #define PNG_PASS_ROW_SHIFT(pass) ((pass)>2?(8-(pass))>>1:3) |
| 2641 | #define PNG_PASS_COL_SHIFT(pass) ((pass)>1?(7-(pass))>>1:3) |
| 2642 | |
| 2643 | /* Hence two macros to determine the number of rows or columns in a given |
| 2644 | * pass of an image given its height or width. In fact these macros may |
| 2645 | * return non-zero even though the sub-image is empty, because the other |
| 2646 | * dimension may be empty for a small image. |
| 2647 | */ |
| 2648 | #define PNG_PASS_ROWS(height, pass) (((height)+(((1<<PNG_PASS_ROW_SHIFT(pass))\ |
| 2649 | -1)-PNG_PASS_START_ROW(pass)))>>PNG_PASS_ROW_SHIFT(pass)) |
| 2650 | #define PNG_PASS_COLS(width, pass) (((width)+(((1<<PNG_PASS_COL_SHIFT(pass))\ |
| 2651 | -1)-PNG_PASS_START_COL(pass)))>>PNG_PASS_COL_SHIFT(pass)) |
| 2652 | |
John Bowler | 9616ad9 | 2011-02-16 06:13:46 -0600 | [diff] [blame] | 2653 | /* For the reader row callbacks (both progressive and sequential) it is |
| 2654 | * necessary to find the row in the output image given a row in an interlaced |
| 2655 | * image, so two more macros: |
John Bowler | 660c6e4 | 2010-12-19 06:22:23 -0600 | [diff] [blame] | 2656 | */ |
Glenn Randers-Pehrson | 871b1d0 | 2013-03-02 14:58:22 -0600 | [diff] [blame] | 2657 | #define PNG_ROW_FROM_PASS_ROW(y_in, pass) \ |
| 2658 | (((y_in)<<PNG_PASS_ROW_SHIFT(pass))+PNG_PASS_START_ROW(pass)) |
| 2659 | #define PNG_COL_FROM_PASS_COL(x_in, pass) \ |
| 2660 | (((x_in)<<PNG_PASS_COL_SHIFT(pass))+PNG_PASS_START_COL(pass)) |
John Bowler | 660c6e4 | 2010-12-19 06:22:23 -0600 | [diff] [blame] | 2661 | |
| 2662 | /* Two macros which return a boolean (0 or 1) saying whether the given row |
| 2663 | * or column is in a particular pass. These use a common utility macro that |
| 2664 | * returns a mask for a given pass - the offset 'off' selects the row or |
| 2665 | * column version. The mask has the appropriate bit set for each column in |
| 2666 | * the tile. |
| 2667 | */ |
| 2668 | #define PNG_PASS_MASK(pass,off) ( \ |
John Bowler | 4e68aa7 | 2011-10-11 16:01:33 -0500 | [diff] [blame] | 2669 | ((0x110145AF>>(((7-(off))-(pass))<<2)) & 0xF) | \ |
| 2670 | ((0x01145AF0>>(((7-(off))-(pass))<<2)) & 0xF0)) |
John Bowler | 660c6e4 | 2010-12-19 06:22:23 -0600 | [diff] [blame] | 2671 | |
| 2672 | #define PNG_ROW_IN_INTERLACE_PASS(y, pass) \ |
| 2673 | ((PNG_PASS_MASK(pass,0) >> ((y)&7)) & 1) |
| 2674 | #define PNG_COL_IN_INTERLACE_PASS(x, pass) \ |
| 2675 | ((PNG_PASS_MASK(pass,1) >> ((x)&7)) & 1) |
| 2676 | |
Glenn Randers-Pehrson | 1d96361 | 1998-05-02 12:52:25 -0500 | [diff] [blame] | 2677 | #ifdef PNG_READ_COMPOSITE_NODIV_SUPPORTED |
Glenn Randers-Pehrson | 8686fff | 1998-05-21 09:27:50 -0500 | [diff] [blame] | 2678 | /* With these routines we avoid an integer divide, which will be slower on |
| 2679 | * most machines. However, it does take more operations than the corresponding |
| 2680 | * 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] | 2681 | * shifts (by 8 or 16 bits) and an addition, versus a single integer divide. |
| 2682 | * |
| 2683 | * Note that the rounding factors are NOT supposed to be the same! 128 and |
| 2684 | * 32768 are correct for the NODIV code; 127 and 32767 are correct for the |
| 2685 | * standard method. |
| 2686 | * |
| 2687 | * [Optimized code by Greg Roelofs and Mark Adler...blame us for bugs. :-) ] |
| 2688 | */ |
| 2689 | |
Glenn Randers-Pehrson | eae8e36 | 2010-03-12 17:36:53 -0600 | [diff] [blame] | 2690 | /* fg and bg should be in `gamma 1.0' space; alpha is the opacity */ |
Glenn Randers-Pehrson | 5c6aeb2 | 1998-12-29 11:47:59 -0600 | [diff] [blame] | 2691 | |
Glenn Randers-Pehrson | e3f3c4e | 2010-02-07 18:08:50 -0600 | [diff] [blame] | 2692 | # define png_composite(composite, fg, alpha, bg) \ |
| 2693 | { png_uint_16 temp = (png_uint_16)((png_uint_16)(fg) \ |
| 2694 | * (png_uint_16)(alpha) \ |
| 2695 | + (png_uint_16)(bg)*(png_uint_16)(255 \ |
John Bowler | 7515612 | 2011-09-09 17:21:44 -0500 | [diff] [blame] | 2696 | - (png_uint_16)(alpha)) + 128); \ |
Glenn Randers-Pehrson | 1d96361 | 1998-05-02 12:52:25 -0500 | [diff] [blame] | 2697 | (composite) = (png_byte)((temp + (temp >> 8)) >> 8); } |
Glenn Randers-Pehrson | 5c6aeb2 | 1998-12-29 11:47:59 -0600 | [diff] [blame] | 2698 | |
Glenn Randers-Pehrson | e3f3c4e | 2010-02-07 18:08:50 -0600 | [diff] [blame] | 2699 | # define png_composite_16(composite, fg, alpha, bg) \ |
| 2700 | { png_uint_32 temp = (png_uint_32)((png_uint_32)(fg) \ |
| 2701 | * (png_uint_32)(alpha) \ |
John Bowler | 7515612 | 2011-09-09 17:21:44 -0500 | [diff] [blame] | 2702 | + (png_uint_32)(bg)*(65535 \ |
| 2703 | - (png_uint_32)(alpha)) + 32768); \ |
Glenn Randers-Pehrson | 1d96361 | 1998-05-02 12:52:25 -0500 | [diff] [blame] | 2704 | (composite) = (png_uint_16)((temp + (temp >> 16)) >> 16); } |
| 2705 | |
Glenn Randers-Pehrson | 6c7a09a | 2009-06-15 21:57:39 -0500 | [diff] [blame] | 2706 | #else /* Standard method using integer division */ |
Glenn Randers-Pehrson | 1d96361 | 1998-05-02 12:52:25 -0500 | [diff] [blame] | 2707 | |
Glenn Randers-Pehrson | eae8e36 | 2010-03-12 17:36:53 -0600 | [diff] [blame] | 2708 | # define png_composite(composite, fg, alpha, bg) \ |
| 2709 | (composite) = (png_byte)(((png_uint_16)(fg) * (png_uint_16)(alpha) + \ |
Glenn Randers-Pehrson | e8b1aa0 | 2010-03-06 11:39:29 -0600 | [diff] [blame] | 2710 | (png_uint_16)(bg) * (png_uint_16)(255 - (png_uint_16)(alpha)) + \ |
John Bowler | 7515612 | 2011-09-09 17:21:44 -0500 | [diff] [blame] | 2711 | 127) / 255) |
Glenn Randers-Pehrson | 5c6aeb2 | 1998-12-29 11:47:59 -0600 | [diff] [blame] | 2712 | |
| 2713 | # define png_composite_16(composite, fg, alpha, bg) \ |
Glenn Randers-Pehrson | 1d96361 | 1998-05-02 12:52:25 -0500 | [diff] [blame] | 2714 | (composite) = (png_uint_16)(((png_uint_32)(fg) * (png_uint_32)(alpha) + \ |
John Bowler | 7515612 | 2011-09-09 17:21:44 -0500 | [diff] [blame] | 2715 | (png_uint_32)(bg)*(png_uint_32)(65535 - (png_uint_32)(alpha)) + \ |
| 2716 | 32767) / 65535) |
Glenn Randers-Pehrson | 1d96361 | 1998-05-02 12:52:25 -0500 | [diff] [blame] | 2717 | #endif /* PNG_READ_COMPOSITE_NODIV_SUPPORTED */ |
| 2718 | |
Glenn Randers-Pehrson | c3d73f4 | 2010-04-24 09:18:57 -0500 | [diff] [blame] | 2719 | #ifdef PNG_READ_INT_FUNCTIONS_SUPPORTED |
Glenn Randers-Pehrson | 23d3970 | 2010-12-06 18:28:02 -0600 | [diff] [blame] | 2720 | PNG_EXPORT(201, png_uint_32, png_get_uint_32, (png_const_bytep buf)); |
| 2721 | PNG_EXPORT(202, png_uint_16, png_get_uint_16, (png_const_bytep buf)); |
| 2722 | PNG_EXPORT(203, png_int_32, png_get_int_32, (png_const_bytep buf)); |
Glenn Randers-Pehrson | c3d73f4 | 2010-04-24 09:18:57 -0500 | [diff] [blame] | 2723 | #endif |
| 2724 | |
John Bowler | 5d56786 | 2011-12-24 09:12:00 -0600 | [diff] [blame] | 2725 | PNG_EXPORT(204, png_uint_32, png_get_uint_31, (png_const_structrp png_ptr, |
Glenn Randers-Pehrson | 23d3970 | 2010-12-06 18:28:02 -0600 | [diff] [blame] | 2726 | png_const_bytep buf)); |
Glenn Randers-Pehrson | 9c3ab68 | 2006-02-20 22:09:05 -0600 | [diff] [blame] | 2727 | /* No png_get_int_16 -- may be added if there's a real need for it. */ |
| 2728 | |
Glenn Randers-Pehrson | 6c7a09a | 2009-06-15 21:57:39 -0500 | [diff] [blame] | 2729 | /* Place a 32-bit number into a buffer in PNG byte order (big-endian). */ |
Glenn Randers-Pehrson | c3d73f4 | 2010-04-24 09:18:57 -0500 | [diff] [blame] | 2730 | #ifdef PNG_WRITE_INT_FUNCTIONS_SUPPORTED |
Glenn Randers-Pehrson | 23d3970 | 2010-12-06 18:28:02 -0600 | [diff] [blame] | 2731 | PNG_EXPORT(205, void, png_save_uint_32, (png_bytep buf, png_uint_32 i)); |
Glenn Randers-Pehrson | c3d73f4 | 2010-04-24 09:18:57 -0500 | [diff] [blame] | 2732 | #endif |
Glenn Randers-Pehrson | 862cb20 | 2010-04-16 22:12:51 -0500 | [diff] [blame] | 2733 | #ifdef PNG_SAVE_INT_32_SUPPORTED |
Glenn Randers-Pehrson | 23d3970 | 2010-12-06 18:28:02 -0600 | [diff] [blame] | 2734 | PNG_EXPORT(206, void, png_save_int_32, (png_bytep buf, png_int_32 i)); |
Glenn Randers-Pehrson | 862cb20 | 2010-04-16 22:12:51 -0500 | [diff] [blame] | 2735 | #endif |
Glenn Randers-Pehrson | 9c3ab68 | 2006-02-20 22:09:05 -0600 | [diff] [blame] | 2736 | |
| 2737 | /* Place a 16-bit number into a buffer in PNG byte order. |
Glenn Randers-Pehrson | c36bb79 | 2011-02-12 09:49:07 -0600 | [diff] [blame] | 2738 | * The parameter is declared unsigned int, not png_uint_16, |
Glenn Randers-Pehrson | 9c3ab68 | 2006-02-20 22:09:05 -0600 | [diff] [blame] | 2739 | * just to avoid potential problems on pre-ANSI C compilers. |
| 2740 | */ |
Glenn Randers-Pehrson | c3d73f4 | 2010-04-24 09:18:57 -0500 | [diff] [blame] | 2741 | #ifdef PNG_WRITE_INT_FUNCTIONS_SUPPORTED |
Glenn Randers-Pehrson | 23d3970 | 2010-12-06 18:28:02 -0600 | [diff] [blame] | 2742 | PNG_EXPORT(207, void, png_save_uint_16, (png_bytep buf, unsigned int i)); |
Glenn Randers-Pehrson | 9c3ab68 | 2006-02-20 22:09:05 -0600 | [diff] [blame] | 2743 | /* No png_save_int_16 -- may be added if there's a real need for it. */ |
Glenn Randers-Pehrson | c3d73f4 | 2010-04-24 09:18:57 -0500 | [diff] [blame] | 2744 | #endif |
Glenn Randers-Pehrson | 9c3ab68 | 2006-02-20 22:09:05 -0600 | [diff] [blame] | 2745 | |
John Bowler | f21a0d0 | 2011-01-23 23:55:19 -0600 | [diff] [blame] | 2746 | #ifdef PNG_USE_READ_MACROS |
| 2747 | /* Inline macros to do direct reads of bytes from the input buffer. |
| 2748 | * The png_get_int_32() routine assumes we are using two's complement |
| 2749 | * format for negative values, which is almost certainly true. |
| 2750 | */ |
Glenn Randers-Pehrson | 871b1d0 | 2013-03-02 14:58:22 -0600 | [diff] [blame] | 2751 | # define PNG_get_uint_32(buf) \ |
John Bowler | f21a0d0 | 2011-01-23 23:55:19 -0600 | [diff] [blame] | 2752 | (((png_uint_32)(*(buf)) << 24) + \ |
| 2753 | ((png_uint_32)(*((buf) + 1)) << 16) + \ |
| 2754 | ((png_uint_32)(*((buf) + 2)) << 8) + \ |
| 2755 | ((png_uint_32)(*((buf) + 3)))) |
| 2756 | |
| 2757 | /* From libpng-1.4.0 until 1.4.4, the png_get_uint_16 macro (but not the |
| 2758 | * function) incorrectly returned a value of type png_uint_32. |
| 2759 | */ |
Glenn Randers-Pehrson | 871b1d0 | 2013-03-02 14:58:22 -0600 | [diff] [blame] | 2760 | # define PNG_get_uint_16(buf) \ |
John Bowler | f21a0d0 | 2011-01-23 23:55:19 -0600 | [diff] [blame] | 2761 | ((png_uint_16) \ |
| 2762 | (((unsigned int)(*(buf)) << 8) + \ |
| 2763 | ((unsigned int)(*((buf) + 1))))) |
| 2764 | |
Glenn Randers-Pehrson | 871b1d0 | 2013-03-02 14:58:22 -0600 | [diff] [blame] | 2765 | # define PNG_get_int_32(buf) \ |
John Bowler | f21a0d0 | 2011-01-23 23:55:19 -0600 | [diff] [blame] | 2766 | ((png_int_32)((*(buf) & 0x80) \ |
| 2767 | ? -((png_int_32)((png_get_uint_32(buf) ^ 0xffffffffL) + 1)) \ |
| 2768 | : (png_int_32)png_get_uint_32(buf))) |
Glenn Randers-Pehrson | 871b1d0 | 2013-03-02 14:58:22 -0600 | [diff] [blame] | 2769 | |
| 2770 | /* If PNG_PREFIX is defined the same thing as below happens in pnglibconf.h, |
| 2771 | * but defining a macro name prefixed with PNG_PREFIX. |
| 2772 | */ |
| 2773 | # ifndef PNG_PREFIX |
| 2774 | # define png_get_uint_32(buf) PNG_get_uint_32(buf) |
| 2775 | # define png_get_uint_16(buf) PNG_get_uint_16(buf) |
| 2776 | # define png_get_int_32(buf) PNG_get_int_32(buf) |
| 2777 | # endif |
| 2778 | #else |
| 2779 | # ifdef PNG_PREFIX |
| 2780 | /* No macros; revert to the (redefined) function */ |
| 2781 | # define PNG_get_uint_32 (png_get_uint_32) |
| 2782 | # define PNG_get_uint_16 (png_get_uint_16) |
| 2783 | # define PNG_get_int_32 (png_get_int_32) |
| 2784 | # endif |
John Bowler | f21a0d0 | 2011-01-23 23:55:19 -0600 | [diff] [blame] | 2785 | #endif |
| 2786 | |
John Bowler | 7875d53 | 2011-11-07 22:33:49 -0600 | [diff] [blame] | 2787 | /******************************************************************************* |
| 2788 | * SIMPLIFIED API |
Glenn Randers-Pehrson | 84b0da9 | 2011-11-10 06:32:19 -0600 | [diff] [blame] | 2789 | ******************************************************************************* |
| 2790 | * |
Glenn Randers-Pehrson | 5a956a7 | 2011-12-22 14:23:37 -0600 | [diff] [blame] | 2791 | * Please read the documentation in libpng-manual.txt (TODO: write said |
| 2792 | * documentation) if you don't understand what follows. |
John Bowler | 7875d53 | 2011-11-07 22:33:49 -0600 | [diff] [blame] | 2793 | * |
| 2794 | * The simplified API hides the details of both libpng and the PNG file format |
| 2795 | * itself. It allows PNG files to be read into a very limited number of |
| 2796 | * in-memory bitmap formats or to be written from the same formats. If these |
| 2797 | * formats do not accomodate your needs then you can, and should, use the more |
| 2798 | * sophisticated APIs above - these support a wide variety of in-memory formats |
| 2799 | * and a wide variety of sophisticated transformations to those formats as well |
Glenn Randers-Pehrson | 871b1d0 | 2013-03-02 14:58:22 -0600 | [diff] [blame] | 2800 | * as a wide variety of APIs to manipulate ancillary information. |
John Bowler | 7875d53 | 2011-11-07 22:33:49 -0600 | [diff] [blame] | 2801 | * |
| 2802 | * To read a PNG file using the simplified API: |
| 2803 | * |
Glenn Randers-Pehrson | 871b1d0 | 2013-03-02 14:58:22 -0600 | [diff] [blame] | 2804 | * 1) Declare a 'png_image' structure (see below) on the stack and set the |
| 2805 | * version field to PNG_IMAGE_VERSION. |
John Bowler | 7875d53 | 2011-11-07 22:33:49 -0600 | [diff] [blame] | 2806 | * 2) Call the appropriate png_image_begin_read... function. |
Glenn Randers-Pehrson | 871b1d0 | 2013-03-02 14:58:22 -0600 | [diff] [blame] | 2807 | * 3) Set the png_image 'format' member to the required sample format. |
| 2808 | * 4) Allocate a buffer for the image and, if required, the color-map. |
| 2809 | * 5) Call png_image_finish_read to read the image and, if required, the |
| 2810 | * color-map into your buffers. |
John Bowler | 7875d53 | 2011-11-07 22:33:49 -0600 | [diff] [blame] | 2811 | * |
Glenn Randers-Pehrson | 84b0da9 | 2011-11-10 06:32:19 -0600 | [diff] [blame] | 2812 | * There are no restrictions on the format of the PNG input itself; all valid |
| 2813 | * color types, bit depths, and interlace methods are acceptable, and the |
| 2814 | * input image is transformed as necessary to the requested in-memory format |
Glenn Randers-Pehrson | 871b1d0 | 2013-03-02 14:58:22 -0600 | [diff] [blame] | 2815 | * during the png_image_finish_read() step. The only caveat is that if you |
| 2816 | * request a color-mapped image from a PNG that is full-color or makes |
| 2817 | * complex use of an alpha channel the transformation is extremely lossy and the |
| 2818 | * result may look terrible. |
Glenn Randers-Pehrson | 84b0da9 | 2011-11-10 06:32:19 -0600 | [diff] [blame] | 2819 | * |
John Bowler | 7875d53 | 2011-11-07 22:33:49 -0600 | [diff] [blame] | 2820 | * To write a PNG file using the simplified API: |
| 2821 | * |
| 2822 | * 1) Declare a 'png_image' structure on the stack and memset() it to all zero. |
| 2823 | * 2) Initialize the members of the structure that describe the image, setting |
Glenn Randers-Pehrson | 871b1d0 | 2013-03-02 14:58:22 -0600 | [diff] [blame] | 2824 | * the 'format' member to the format of the image samples. |
John Bowler | 5bc9038 | 2012-01-23 22:43:22 -0600 | [diff] [blame] | 2825 | * 3) Call the appropriate png_image_write... function with a pointer to the |
Glenn Randers-Pehrson | 871b1d0 | 2013-03-02 14:58:22 -0600 | [diff] [blame] | 2826 | * image and, if necessary, the color-map to write the PNG data. |
John Bowler | 7875d53 | 2011-11-07 22:33:49 -0600 | [diff] [blame] | 2827 | * |
Glenn Randers-Pehrson | efc4b69 | 2011-11-07 23:31:34 -0600 | [diff] [blame] | 2828 | * png_image is a structure that describes the in-memory format of an image |
Glenn Randers-Pehrson | 871b1d0 | 2013-03-02 14:58:22 -0600 | [diff] [blame] | 2829 | * when it is being read or defines the in-memory format of an image that you |
John Bowler | 7875d53 | 2011-11-07 22:33:49 -0600 | [diff] [blame] | 2830 | * need to write: |
| 2831 | */ |
Glenn Randers-Pehrson | 871b1d0 | 2013-03-02 14:58:22 -0600 | [diff] [blame] | 2832 | #define PNG_IMAGE_VERSION 1 |
Glenn Randers-Pehrson | 84b0da9 | 2011-11-10 06:32:19 -0600 | [diff] [blame] | 2833 | |
John Bowler | 7875d53 | 2011-11-07 22:33:49 -0600 | [diff] [blame] | 2834 | typedef struct png_control *png_controlp; |
| 2835 | typedef struct |
| 2836 | { |
Glenn Randers-Pehrson | 871b1d0 | 2013-03-02 14:58:22 -0600 | [diff] [blame] | 2837 | png_controlp opaque; /* Initialize to NULL, free with png_image_free */ |
| 2838 | png_uint_32 version; /* Set to PNG_IMAGE_VERSION */ |
| 2839 | png_uint_32 width; /* Image width in pixels (columns) */ |
| 2840 | png_uint_32 height; /* Image height in pixels (rows) */ |
| 2841 | png_uint_32 format; /* Image format as defined below */ |
| 2842 | png_uint_32 flags; /* A bit mask containing informational flags */ |
| 2843 | png_uint_32 colormap_entries; |
| 2844 | /* Number of entries in the color-map */ |
John Bowler | 04336ba | 2012-01-16 07:48:36 -0600 | [diff] [blame] | 2845 | |
John Bowler | 7875d53 | 2011-11-07 22:33:49 -0600 | [diff] [blame] | 2846 | /* In the event of an error or warning the following field will be set to a |
| 2847 | * non-zero value and the 'message' field will contain a '\0' terminated |
Glenn Randers-Pehrson | 84b0da9 | 2011-11-10 06:32:19 -0600 | [diff] [blame] | 2848 | * string with the libpng error or warning message. If both warnings and |
| 2849 | * an error were encountered, only the error is recorded. If there |
| 2850 | * are multiple warnings, only the first one is recorded. |
| 2851 | * |
Glenn Randers-Pehrson | 871b1d0 | 2013-03-02 14:58:22 -0600 | [diff] [blame] | 2852 | * The upper 30 bits of this value are reserved, the low two bits contain |
| 2853 | * a value as follows: |
John Bowler | 04336ba | 2012-01-16 07:48:36 -0600 | [diff] [blame] | 2854 | */ |
Glenn Randers-Pehrson | 871b1d0 | 2013-03-02 14:58:22 -0600 | [diff] [blame] | 2855 | # define PNG_IMAGE_WARNING 1 |
| 2856 | # define PNG_IMAGE_ERROR 2 |
| 2857 | /* |
| 2858 | * The result is a two bit code such that a value more than 1 indicates |
| 2859 | * a failure in the API just called: |
| 2860 | * |
| 2861 | * 0 - no warning or error |
| 2862 | * 1 - warning |
| 2863 | * 2 - error |
| 2864 | * 3 - error preceded by warning |
| 2865 | */ |
| 2866 | # define PNG_IMAGE_FAILED(png_cntrl) ((((png_cntrl).warning_or_error)&0x03)>1) |
| 2867 | |
John Bowler | 7875d53 | 2011-11-07 22:33:49 -0600 | [diff] [blame] | 2868 | png_uint_32 warning_or_error; |
Glenn Randers-Pehrson | 871b1d0 | 2013-03-02 14:58:22 -0600 | [diff] [blame] | 2869 | |
John Bowler | 7875d53 | 2011-11-07 22:33:49 -0600 | [diff] [blame] | 2870 | char message[64]; |
| 2871 | } png_image, *png_imagep; |
| 2872 | |
Glenn Randers-Pehrson | 871b1d0 | 2013-03-02 14:58:22 -0600 | [diff] [blame] | 2873 | /* The samples of the image have one to four channels whose components have |
| 2874 | * original values in the range 0 to 1.0: |
John Bowler | 7875d53 | 2011-11-07 22:33:49 -0600 | [diff] [blame] | 2875 | * |
| 2876 | * 1: A single gray or luminance channel (G). |
| 2877 | * 2: A gray/luminance channel and an alpha channel (GA). |
| 2878 | * 3: Three red, green, blue color channels (RGB). |
| 2879 | * 4: Three color channels and an alpha channel (RGBA). |
| 2880 | * |
Glenn Randers-Pehrson | 871b1d0 | 2013-03-02 14:58:22 -0600 | [diff] [blame] | 2881 | * The components are encoded in one of two ways: |
John Bowler | 7875d53 | 2011-11-07 22:33:49 -0600 | [diff] [blame] | 2882 | * |
Glenn Randers-Pehrson | 871b1d0 | 2013-03-02 14:58:22 -0600 | [diff] [blame] | 2883 | * a) As a small integer, value 0..255, contained in a single byte. For the |
John Bowler | dd81915 | 2011-11-08 14:29:45 -0600 | [diff] [blame] | 2884 | * alpha channel the original value is simply value/255. For the color or |
John Bowler | 7875d53 | 2011-11-07 22:33:49 -0600 | [diff] [blame] | 2885 | * luminance channels the value is encoded according to the sRGB specification |
| 2886 | * and matches the 8-bit format expected by typical display devices. |
| 2887 | * |
Glenn Randers-Pehrson | 871b1d0 | 2013-03-02 14:58:22 -0600 | [diff] [blame] | 2888 | * The color/gray channels are not scaled (pre-multiplied) by the alpha |
John Bowler | 7875d53 | 2011-11-07 22:33:49 -0600 | [diff] [blame] | 2889 | * channel and are suitable for passing to color management software. |
| 2890 | * |
Glenn Randers-Pehrson | 871b1d0 | 2013-03-02 14:58:22 -0600 | [diff] [blame] | 2891 | * b) As a value in the range 0..65535, contained in a 2-byte integer. All |
John Bowler | 7875d53 | 2011-11-07 22:33:49 -0600 | [diff] [blame] | 2892 | * channels can be converted to the original value by dividing by 65535; all |
| 2893 | * channels are linear. Color channels use the RGB encoding (RGB end-points) of |
| 2894 | * the sRGB specification. This encoding is identified by the |
| 2895 | * PNG_FORMAT_FLAG_LINEAR flag below. |
| 2896 | * |
Glenn Randers-Pehrson | 871b1d0 | 2013-03-02 14:58:22 -0600 | [diff] [blame] | 2897 | * When the simplified API needs to convert between sRGB and linear colorspaces, |
| 2898 | * the actual sRGB transfer curve defined in the sRGB specification (see the |
| 2899 | * article at http://en.wikipedia.org/wiki/SRGB) is used, not the gamma=1/2.2 |
| 2900 | * approximation used elsewhere in libpng. |
| 2901 | * |
| 2902 | * When an alpha channel is present it is expected to denote pixel coverage |
John Bowler | 7875d53 | 2011-11-07 22:33:49 -0600 | [diff] [blame] | 2903 | * of the color or luminance channels and is returned as an associated alpha |
Glenn Randers-Pehrson | 84b0da9 | 2011-11-10 06:32:19 -0600 | [diff] [blame] | 2904 | * channel: the color/gray channels are scaled (pre-multiplied) by the alpha |
| 2905 | * value. |
Glenn Randers-Pehrson | 871b1d0 | 2013-03-02 14:58:22 -0600 | [diff] [blame] | 2906 | * |
| 2907 | * The samples are either contained directly in the image data, between 1 and 8 |
| 2908 | * bytes per pixel according to the encoding, or are held in a color-map indexed |
| 2909 | * by bytes in the image data. In the case of a color-map the color-map entries |
| 2910 | * are individual samples, encoded as above, and the image data has one byte per |
| 2911 | * pixel to select the relevant sample from the color-map. |
John Bowler | 7875d53 | 2011-11-07 22:33:49 -0600 | [diff] [blame] | 2912 | */ |
| 2913 | |
| 2914 | /* PNG_FORMAT_* |
| 2915 | * |
| 2916 | * #defines to be used in png_image::format. Each #define identifies a |
Glenn Randers-Pehrson | 871b1d0 | 2013-03-02 14:58:22 -0600 | [diff] [blame] | 2917 | * particular layout of sample data and, if present, alpha values. There are |
| 2918 | * separate defines for each of the two component encodings. |
John Bowler | 7875d53 | 2011-11-07 22:33:49 -0600 | [diff] [blame] | 2919 | * |
Glenn Randers-Pehrson | 871b1d0 | 2013-03-02 14:58:22 -0600 | [diff] [blame] | 2920 | * A format is built up using single bit flag values. All combinations are |
| 2921 | * valid. Formats can be built up from the flag values or you can use one of |
| 2922 | * the predefined values below. When testing formats always use the FORMAT_FLAG |
| 2923 | * macros to test for individual features - future versions of the library may |
| 2924 | * add new flags. |
| 2925 | * |
| 2926 | * When reading or writing color-mapped images the format should be set to the |
| 2927 | * format of the entries in the color-map then png_image_{read,write}_colormap |
| 2928 | * called to read or write the color-map and set the format correctly for the |
| 2929 | * image data. Do not set the PNG_FORMAT_FLAG_COLORMAP bit directly! |
John Bowler | 04336ba | 2012-01-16 07:48:36 -0600 | [diff] [blame] | 2930 | * |
John Bowler | 7875d53 | 2011-11-07 22:33:49 -0600 | [diff] [blame] | 2931 | * NOTE: libpng can be built with particular features disabled, if you see |
| 2932 | * compiler errors because the definition of one of the following flags has been |
| 2933 | * compiled out it is because libpng does not have the required support. It is |
| 2934 | * possible, however, for the libpng configuration to enable the format on just |
Glenn Randers-Pehrson | 84b0da9 | 2011-11-10 06:32:19 -0600 | [diff] [blame] | 2935 | * read or just write; in that case you may see an error at run time. You can |
Glenn Randers-Pehrson | 871b1d0 | 2013-03-02 14:58:22 -0600 | [diff] [blame] | 2936 | * guard against this by checking for the definition of the appropriate |
| 2937 | * "_SUPPORTED" macro, one of: |
John Bowler | 7875d53 | 2011-11-07 22:33:49 -0600 | [diff] [blame] | 2938 | * |
| 2939 | * PNG_SIMPLIFIED_{READ,WRITE}_{BGR,AFIRST}_SUPPORTED |
| 2940 | */ |
Glenn Randers-Pehrson | 871b1d0 | 2013-03-02 14:58:22 -0600 | [diff] [blame] | 2941 | #define PNG_FORMAT_FLAG_ALPHA 0x01U /* format with an alpha channel */ |
| 2942 | #define PNG_FORMAT_FLAG_COLOR 0x02U /* color format: otherwise grayscale */ |
| 2943 | #define PNG_FORMAT_FLAG_LINEAR 0x04U /* 2 byte channels else 1 byte */ |
| 2944 | #define PNG_FORMAT_FLAG_COLORMAP 0x08U /* image data is color-mapped */ |
John Bowler | 7875d53 | 2011-11-07 22:33:49 -0600 | [diff] [blame] | 2945 | |
| 2946 | #ifdef PNG_FORMAT_BGR_SUPPORTED |
Glenn Randers-Pehrson | 871b1d0 | 2013-03-02 14:58:22 -0600 | [diff] [blame] | 2947 | # define PNG_FORMAT_FLAG_BGR 0x10U /* BGR colors, else order is RGB */ |
John Bowler | 7875d53 | 2011-11-07 22:33:49 -0600 | [diff] [blame] | 2948 | #endif |
| 2949 | |
| 2950 | #ifdef PNG_FORMAT_AFIRST_SUPPORTED |
Glenn Randers-Pehrson | 871b1d0 | 2013-03-02 14:58:22 -0600 | [diff] [blame] | 2951 | # define PNG_FORMAT_FLAG_AFIRST 0x20U /* alpha channel comes first */ |
John Bowler | 7875d53 | 2011-11-07 22:33:49 -0600 | [diff] [blame] | 2952 | #endif |
| 2953 | |
Glenn Randers-Pehrson | 871b1d0 | 2013-03-02 14:58:22 -0600 | [diff] [blame] | 2954 | /* Commonly used formats have predefined macros. |
John Bowler | 7875d53 | 2011-11-07 22:33:49 -0600 | [diff] [blame] | 2955 | * |
Glenn Randers-Pehrson | 871b1d0 | 2013-03-02 14:58:22 -0600 | [diff] [blame] | 2956 | * First the single byte (sRGB) formats: |
John Bowler | 7875d53 | 2011-11-07 22:33:49 -0600 | [diff] [blame] | 2957 | */ |
| 2958 | #define PNG_FORMAT_GRAY 0 |
| 2959 | #define PNG_FORMAT_GA PNG_FORMAT_FLAG_ALPHA |
John Bowler | dd81915 | 2011-11-08 14:29:45 -0600 | [diff] [blame] | 2960 | #define PNG_FORMAT_AG (PNG_FORMAT_GA|PNG_FORMAT_FLAG_AFIRST) |
John Bowler | 7875d53 | 2011-11-07 22:33:49 -0600 | [diff] [blame] | 2961 | #define PNG_FORMAT_RGB PNG_FORMAT_FLAG_COLOR |
| 2962 | #define PNG_FORMAT_BGR (PNG_FORMAT_FLAG_COLOR|PNG_FORMAT_FLAG_BGR) |
| 2963 | #define PNG_FORMAT_RGBA (PNG_FORMAT_RGB|PNG_FORMAT_FLAG_ALPHA) |
| 2964 | #define PNG_FORMAT_ARGB (PNG_FORMAT_RGBA|PNG_FORMAT_FLAG_AFIRST) |
| 2965 | #define PNG_FORMAT_BGRA (PNG_FORMAT_BGR|PNG_FORMAT_FLAG_ALPHA) |
| 2966 | #define PNG_FORMAT_ABGR (PNG_FORMAT_BGRA|PNG_FORMAT_FLAG_AFIRST) |
| 2967 | |
Glenn Randers-Pehrson | 871b1d0 | 2013-03-02 14:58:22 -0600 | [diff] [blame] | 2968 | /* Then the linear 2-byte formats. When naming these "Y" is used to |
| 2969 | * indicate a luminance (gray) channel. |
John Bowler | 7875d53 | 2011-11-07 22:33:49 -0600 | [diff] [blame] | 2970 | */ |
John Bowler | dd81915 | 2011-11-08 14:29:45 -0600 | [diff] [blame] | 2971 | #define PNG_FORMAT_LINEAR_Y PNG_FORMAT_FLAG_LINEAR |
| 2972 | #define PNG_FORMAT_LINEAR_Y_ALPHA (PNG_FORMAT_FLAG_LINEAR|PNG_FORMAT_FLAG_ALPHA) |
| 2973 | #define PNG_FORMAT_LINEAR_RGB (PNG_FORMAT_FLAG_LINEAR|PNG_FORMAT_FLAG_COLOR) |
| 2974 | #define PNG_FORMAT_LINEAR_RGB_ALPHA \ |
| 2975 | (PNG_FORMAT_FLAG_LINEAR|PNG_FORMAT_FLAG_COLOR|PNG_FORMAT_FLAG_ALPHA) |
John Bowler | 7875d53 | 2011-11-07 22:33:49 -0600 | [diff] [blame] | 2976 | |
Glenn Randers-Pehrson | 871b1d0 | 2013-03-02 14:58:22 -0600 | [diff] [blame] | 2977 | /* With color-mapped formats the image data is one byte for each pixel, the byte |
| 2978 | * is an index into the color-map which is formatted as above. To obtain a |
| 2979 | * color-mapped format it is sufficient just to add the PNG_FOMAT_FLAG_COLORMAP |
| 2980 | * to one of the above definitions, or you can use one of the definitions below. |
| 2981 | */ |
| 2982 | #define PNG_FORMAT_RGB_COLORMAP (PNG_FORMAT_RGB|PNG_FORMAT_FLAG_COLORMAP) |
| 2983 | #define PNG_FORMAT_BGR_COLORMAP (PNG_FORMAT_BGR|PNG_FORMAT_FLAG_COLORMAP) |
| 2984 | #define PNG_FORMAT_RGBA_COLORMAP (PNG_FORMAT_RGBA|PNG_FORMAT_FLAG_COLORMAP) |
| 2985 | #define PNG_FORMAT_ARGB_COLORMAP (PNG_FORMAT_ARGB|PNG_FORMAT_FLAG_COLORMAP) |
| 2986 | #define PNG_FORMAT_BGRA_COLORMAP (PNG_FORMAT_BGRA|PNG_FORMAT_FLAG_COLORMAP) |
| 2987 | #define PNG_FORMAT_ABGR_COLORMAP (PNG_FORMAT_ABGR|PNG_FORMAT_FLAG_COLORMAP) |
| 2988 | |
John Bowler | 7875d53 | 2011-11-07 22:33:49 -0600 | [diff] [blame] | 2989 | /* PNG_IMAGE macros |
| 2990 | * |
Glenn Randers-Pehrson | 871b1d0 | 2013-03-02 14:58:22 -0600 | [diff] [blame] | 2991 | * These are convenience macros to derive information from a png_image |
| 2992 | * structure. The PNG_IMAGE_SAMPLE_ macros return values appropriate to the |
| 2993 | * actual image sample values - either the entries in the color-map or the |
| 2994 | * pixels in the image. The PNG_IMAGE_PIXEL_ macros return corresponding values |
| 2995 | * for the pixels and will always return 1 for color-mapped formats. The |
| 2996 | * remaining macros return information about the rows in the image and the |
| 2997 | * complete image. |
| 2998 | * |
| 2999 | * NOTE: All the macros that take a png_image::format parameter are compile time |
| 3000 | * constants if the format parameter is, itself, a constant. Therefore these |
| 3001 | * macros can be used in array declarations and case labels where required. |
| 3002 | * Similarly the macros are also pre-processor constants (sizeof is not used) so |
| 3003 | * they can be used in #if tests. |
| 3004 | * |
| 3005 | * First the information about the samples. |
John Bowler | 7875d53 | 2011-11-07 22:33:49 -0600 | [diff] [blame] | 3006 | */ |
Glenn Randers-Pehrson | 871b1d0 | 2013-03-02 14:58:22 -0600 | [diff] [blame] | 3007 | #define PNG_IMAGE_SAMPLE_CHANNELS(fmt)\ |
| 3008 | (((fmt)&(PNG_FORMAT_FLAG_COLOR|PNG_FORMAT_FLAG_ALPHA))+1) |
John Bowler | 7875d53 | 2011-11-07 22:33:49 -0600 | [diff] [blame] | 3009 | /* Return the total number of channels in a given format: 1..4 */ |
| 3010 | |
Glenn Randers-Pehrson | 871b1d0 | 2013-03-02 14:58:22 -0600 | [diff] [blame] | 3011 | #define PNG_IMAGE_SAMPLE_COMPONENT_SIZE(fmt)\ |
| 3012 | ((((fmt) & PNG_FORMAT_FLAG_LINEAR) >> 2)+1) |
| 3013 | /* Return the size in bytes of a single component of a pixel or color-map |
| 3014 | * entry (as appropriate) in the image: 1 or 2. |
| 3015 | */ |
John Bowler | 7875d53 | 2011-11-07 22:33:49 -0600 | [diff] [blame] | 3016 | |
Glenn Randers-Pehrson | 871b1d0 | 2013-03-02 14:58:22 -0600 | [diff] [blame] | 3017 | #define PNG_IMAGE_SAMPLE_SIZE(fmt)\ |
| 3018 | (PNG_IMAGE_SAMPLE_CHANNELS(fmt) * PNG_IMAGE_SAMPLE_COMPONENT_SIZE(fmt)) |
| 3019 | /* This is the size of the sample data for one sample. If the image is |
| 3020 | * color-mapped it is the size of one color-map entry (and image pixels are |
| 3021 | * one byte in size), otherwise it is the size of one image pixel. |
| 3022 | */ |
| 3023 | |
| 3024 | #define PNG_IMAGE_MAXIMUM_COLORMAP_COMPONENTS(fmt)\ |
| 3025 | (PNG_IMAGE_SAMPLE_CHANNELS(fmt) * 256) |
| 3026 | /* The maximum size of the color-map required by the format expressed in a |
| 3027 | * count of components. This can be used to compile-time allocate a |
| 3028 | * color-map: |
| 3029 | * |
| 3030 | * png_uint_16 colormap[PNG_IMAGE_MAXIMUM_COLORMAP_COMPONENTS(linear_fmt)]; |
| 3031 | * |
| 3032 | * png_byte colormap[PNG_IMAGE_MAXIMUM_COLORMAP_COMPONENTS(sRGB_fmt)]; |
| 3033 | * |
| 3034 | * Alternatively use the PNG_IMAGE_COLORMAP_SIZE macro below to use the |
| 3035 | * information from one of the png_image_begin_read_ APIs and dynamically |
| 3036 | * allocate the required memory. |
| 3037 | */ |
| 3038 | |
| 3039 | /* Corresponding information about the pixels */ |
| 3040 | #define PNG_IMAGE_PIXEL_(test,fmt)\ |
| 3041 | (((fmt)&PNG_FORMAT_FLAG_COLORMAP)?1:test(fmt)) |
| 3042 | |
| 3043 | #define PNG_IMAGE_PIXEL_CHANNELS(fmt)\ |
| 3044 | PNG_IMAGE_PIXEL_(PNG_IMAGE_SAMPLE_CHANNELS,fmt) |
| 3045 | /* The number of separate channels (components) in a pixel; 1 for a |
| 3046 | * color-mapped image. |
| 3047 | */ |
| 3048 | |
| 3049 | #define PNG_IMAGE_PIXEL_COMPONENT_SIZE(fmt)\ |
| 3050 | PNG_IMAGE_PIXEL_(PNG_IMAGE_SAMPLE_COMPONENT_SIZE,fmt) |
| 3051 | /* The size, in bytes, of each component in a pixel; 1 for a color-mapped |
| 3052 | * image. |
| 3053 | */ |
| 3054 | |
| 3055 | #define PNG_IMAGE_PIXEL_SIZE(fmt) PNG_IMAGE_PIXEL_(PNG_IMAGE_SAMPLE_SIZE,fmt) |
| 3056 | /* The size, in bytes, of a complete pixel; 1 for a color-mapped image. */ |
| 3057 | |
| 3058 | /* Information about the whole row, or whole image */ |
John Bowler | 7875d53 | 2011-11-07 22:33:49 -0600 | [diff] [blame] | 3059 | #define PNG_IMAGE_ROW_STRIDE(image)\ |
Glenn Randers-Pehrson | 871b1d0 | 2013-03-02 14:58:22 -0600 | [diff] [blame] | 3060 | (PNG_IMAGE_PIXEL_CHANNELS((image).format) * (image).width) |
John Bowler | 7875d53 | 2011-11-07 22:33:49 -0600 | [diff] [blame] | 3061 | /* Return the total number of components in a single row of the image; this |
| 3062 | * is the minimum 'row stride', the minimum count of components between each |
Glenn Randers-Pehrson | 871b1d0 | 2013-03-02 14:58:22 -0600 | [diff] [blame] | 3063 | * row. For a color-mapped image this is the minimum number of bytes in a |
Glenn Randers-Pehrson | e0a6c06 | 2011-11-07 23:50:05 -0600 | [diff] [blame] | 3064 | * row. |
| 3065 | */ |
John Bowler | 7875d53 | 2011-11-07 22:33:49 -0600 | [diff] [blame] | 3066 | |
| 3067 | #define PNG_IMAGE_BUFFER_SIZE(image, row_stride)\ |
Glenn Randers-Pehrson | 871b1d0 | 2013-03-02 14:58:22 -0600 | [diff] [blame] | 3068 | (PNG_IMAGE_PIXEL_COMPONENT_SIZE((image).format)*(image).height*(row_stride)) |
John Bowler | 7875d53 | 2011-11-07 22:33:49 -0600 | [diff] [blame] | 3069 | /* Return the size, in bytes, of an image buffer given a png_image and a row |
Glenn Randers-Pehrson | e0a6c06 | 2011-11-07 23:50:05 -0600 | [diff] [blame] | 3070 | * stride - the number of components to leave space for in each row. |
| 3071 | */ |
John Bowler | 7875d53 | 2011-11-07 22:33:49 -0600 | [diff] [blame] | 3072 | |
John Bowler | 3706d73 | 2011-11-21 10:28:06 -0600 | [diff] [blame] | 3073 | #define PNG_IMAGE_SIZE(image)\ |
| 3074 | PNG_IMAGE_BUFFER_SIZE(image, PNG_IMAGE_ROW_STRIDE(image)) |
| 3075 | /* Return the size, in bytes, of the image in memory given just a png_image; |
| 3076 | * the row stride is the minimum stride required for the image. |
| 3077 | */ |
| 3078 | |
Glenn Randers-Pehrson | 871b1d0 | 2013-03-02 14:58:22 -0600 | [diff] [blame] | 3079 | #define PNG_IMAGE_COLORMAP_SIZE(image)\ |
| 3080 | (PNG_IMAGE_SAMPLE_SIZE((image).format) * (image).colormap_entries) |
| 3081 | /* Return the size, in bytes, of the color-map of this image. If the image |
| 3082 | * format is not a color-map format this will return a size sufficient for |
| 3083 | * 256 entries in the given format; check PNG_FORMAT_FLAG_COLORMAP if |
| 3084 | * you don't want to allocate a color-map in this case. |
| 3085 | */ |
| 3086 | |
John Bowler | 7875d53 | 2011-11-07 22:33:49 -0600 | [diff] [blame] | 3087 | /* PNG_IMAGE_FLAG_* |
| 3088 | * |
| 3089 | * Flags containing additional information about the image are held in the |
| 3090 | * 'flags' field of png_image. |
| 3091 | */ |
Glenn Randers-Pehrson | 871b1d0 | 2013-03-02 14:58:22 -0600 | [diff] [blame] | 3092 | #define PNG_IMAGE_FLAG_COLORSPACE_NOT_sRGB 0x01 |
John Bowler | 7875d53 | 2011-11-07 22:33:49 -0600 | [diff] [blame] | 3093 | /* This indicates the the RGB values of the in-memory bitmap do not |
| 3094 | * correspond to the red, green and blue end-points defined by sRGB. |
| 3095 | */ |
| 3096 | |
Glenn Randers-Pehrson | 871b1d0 | 2013-03-02 14:58:22 -0600 | [diff] [blame] | 3097 | #define PNG_IMAGE_FLAG_FAST 0x02 |
| 3098 | /* On write emphasise speed over compression; the resultant PNG file will be |
| 3099 | * larger but will be produced significantly faster, particular for large |
| 3100 | * images. Do not use this option for images which will be distributed, only |
| 3101 | * used it when producing intermediate files that will be read back in |
| 3102 | * repeatedly. For a typical 24-bit image the option will double the read |
| 3103 | * speed at the cost of increasing the image size by 25%, however for many |
| 3104 | * more compressible images the PNG file can be 10 times larger with only a |
| 3105 | * slight speed gain. |
| 3106 | */ |
| 3107 | |
John Bowler | 59ae389 | 2013-03-06 22:15:25 -0600 | [diff] [blame] | 3108 | #define PNG_IMAGE_FLAG_16BIT_sRGB 0x04 |
| 3109 | /* On read if the image is a 16-bit per component image and there is no gAMA |
| 3110 | * or sRGB chunk assume that the components are sRGB encoded. Notice that |
| 3111 | * images output by the simplified API always have gamma information; setting |
| 3112 | * this flag only affects the interpretation of 16-bit images from an |
| 3113 | * external source. It is recommended that the application expose this flag |
| 3114 | * to the user; the user can normally easily recognize the difference between |
| 3115 | * linear and sRGB encoding. This flag has no effect on write - the data |
| 3116 | * passed to the write APIs must have the correct encoding (as defined |
| 3117 | * above.) |
| 3118 | * |
| 3119 | * If the flag is not set (the default) input 16-bit per component data is |
| 3120 | * assumed to be linear. |
| 3121 | * |
| 3122 | * NOTE: the flag can only be set after the png_image_begin_read_ call, |
| 3123 | * because that call initializes the 'flags' field. |
| 3124 | */ |
| 3125 | |
John Bowler | 7875d53 | 2011-11-07 22:33:49 -0600 | [diff] [blame] | 3126 | #ifdef PNG_SIMPLIFIED_READ_SUPPORTED |
| 3127 | /* READ APIs |
| 3128 | * --------- |
| 3129 | * |
| 3130 | * The png_image passed to the read APIs must have been initialized by setting |
Glenn Randers-Pehrson | 871b1d0 | 2013-03-02 14:58:22 -0600 | [diff] [blame] | 3131 | * the png_controlp field 'opaque' to NULL (or, safer, memset the whole thing.) |
John Bowler | 7875d53 | 2011-11-07 22:33:49 -0600 | [diff] [blame] | 3132 | */ |
| 3133 | #ifdef PNG_STDIO_SUPPORTED |
| 3134 | PNG_EXPORT(234, int, png_image_begin_read_from_file, (png_imagep image, |
| 3135 | const char *file_name)); |
Glenn Randers-Pehrson | 84b0da9 | 2011-11-10 06:32:19 -0600 | [diff] [blame] | 3136 | /* The named file is opened for read and the image header is filled in |
| 3137 | * from the PNG header in the file. |
Glenn Randers-Pehrson | e0a6c06 | 2011-11-07 23:50:05 -0600 | [diff] [blame] | 3138 | */ |
John Bowler | 7875d53 | 2011-11-07 22:33:49 -0600 | [diff] [blame] | 3139 | |
| 3140 | PNG_EXPORT(235, int, png_image_begin_read_from_stdio, (png_imagep image, |
| 3141 | FILE* file)); |
| 3142 | /* The PNG header is read from the stdio FILE object. */ |
| 3143 | #endif /* PNG_STDIO_SUPPORTED */ |
| 3144 | |
| 3145 | PNG_EXPORT(236, int, png_image_begin_read_from_memory, (png_imagep image, |
| 3146 | png_const_voidp memory, png_size_t size)); |
| 3147 | /* The PNG header is read from the given memory buffer. */ |
| 3148 | |
| 3149 | PNG_EXPORT(237, int, png_image_finish_read, (png_imagep image, |
Glenn Randers-Pehrson | 871b1d0 | 2013-03-02 14:58:22 -0600 | [diff] [blame] | 3150 | png_const_colorp background, void *buffer, png_int_32 row_stride, |
| 3151 | void *colormap)); |
John Bowler | 7875d53 | 2011-11-07 22:33:49 -0600 | [diff] [blame] | 3152 | /* Finish reading the image into the supplied buffer and clean up the |
| 3153 | * png_image structure. |
| 3154 | * |
Glenn Randers-Pehrson | 871b1d0 | 2013-03-02 14:58:22 -0600 | [diff] [blame] | 3155 | * row_stride is the step, in byte or 2-byte units as appropriate, |
John Bowler | 7875d53 | 2011-11-07 22:33:49 -0600 | [diff] [blame] | 3156 | * between adjacent rows. A positive stride indicates that the top-most row |
| 3157 | * is first in the buffer - the normal top-down arrangement. A negative |
| 3158 | * stride indicates that the bottom-most row is first in the buffer. |
| 3159 | * |
| 3160 | * background need only be supplied if an alpha channel must be removed from |
| 3161 | * a png_byte format and the removal is to be done by compositing on a solid |
| 3162 | * color; otherwise it may be NULL and any composition will be done directly |
| 3163 | * onto the buffer. The value is an sRGB color to use for the background, |
| 3164 | * for grayscale output the green channel is used. |
| 3165 | * |
Glenn Randers-Pehrson | 871b1d0 | 2013-03-02 14:58:22 -0600 | [diff] [blame] | 3166 | * background must be supplied when an alpha channel must be removed from a |
| 3167 | * single byte color-mapped output format, in other words if: |
| 3168 | * |
| 3169 | * 1) The original format from png_image_begin_read_from_* had |
| 3170 | * PNG_FORMAT_FLAG_ALPHA set. |
| 3171 | * 2) The format set by the application does not. |
| 3172 | * 3) The format set by the application has PNG_FORMAT_FLAG_COLORMAP set and |
| 3173 | * PNG_FORMAT_FLAG_LINEAR *not* set. |
| 3174 | * |
Glenn Randers-Pehrson | 84b0da9 | 2011-11-10 06:32:19 -0600 | [diff] [blame] | 3175 | * For linear output removing the alpha channel is always done by compositing |
John Bowler | 59ae389 | 2013-03-06 22:15:25 -0600 | [diff] [blame] | 3176 | * on black and background is ignored. |
Glenn Randers-Pehrson | 871b1d0 | 2013-03-02 14:58:22 -0600 | [diff] [blame] | 3177 | * |
| 3178 | * colormap must be supplied when PNG_FORMAT_FLAG_COLORMAP is set. It must |
| 3179 | * be at least the size (in bytes) returned by PNG_IMAGE_COLORMAP_SIZE. |
| 3180 | * image->colormap_entries will be updated to the actual number of entries |
| 3181 | * written to the colormap; this may be less than the original value. |
John Bowler | 7875d53 | 2011-11-07 22:33:49 -0600 | [diff] [blame] | 3182 | */ |
| 3183 | |
| 3184 | PNG_EXPORT(238, void, png_image_free, (png_imagep image)); |
| 3185 | /* Free any data allocated by libpng in image->opaque, setting the pointer to |
Glenn Randers-Pehrson | e0a6c06 | 2011-11-07 23:50:05 -0600 | [diff] [blame] | 3186 | * NULL. May be called at any time after the structure is initialized. |
| 3187 | */ |
John Bowler | 7875d53 | 2011-11-07 22:33:49 -0600 | [diff] [blame] | 3188 | #endif /* PNG_SIMPLIFIED_READ_SUPPORTED */ |
| 3189 | |
| 3190 | #ifdef PNG_SIMPLIFIED_WRITE_SUPPORTED |
Glenn Randers-Pehrson | 4a43182 | 2013-06-05 23:41:49 -0500 | [diff] [blame] | 3191 | #ifdef PNG_STDIO_SUPPORTED |
John Bowler | 7875d53 | 2011-11-07 22:33:49 -0600 | [diff] [blame] | 3192 | /* WRITE APIS |
| 3193 | * ---------- |
| 3194 | * For write you must initialize a png_image structure to describe the image to |
Glenn Randers-Pehrson | 871b1d0 | 2013-03-02 14:58:22 -0600 | [diff] [blame] | 3195 | * be written. To do this use memset to set the whole structure to 0 then |
| 3196 | * initialize fields describing your image. |
John Bowler | 7875d53 | 2011-11-07 22:33:49 -0600 | [diff] [blame] | 3197 | * |
Glenn Randers-Pehrson | 871b1d0 | 2013-03-02 14:58:22 -0600 | [diff] [blame] | 3198 | * version: must be set to PNG_IMAGE_VERSION |
John Bowler | 7875d53 | 2011-11-07 22:33:49 -0600 | [diff] [blame] | 3199 | * opaque: must be initialized to NULL |
| 3200 | * width: image width in pixels |
| 3201 | * height: image height in rows |
Glenn Randers-Pehrson | 871b1d0 | 2013-03-02 14:58:22 -0600 | [diff] [blame] | 3202 | * format: the format of the data (image and color-map) you wish to write |
John Bowler | 7875d53 | 2011-11-07 22:33:49 -0600 | [diff] [blame] | 3203 | * flags: set to 0 unless one of the defined flags applies; set |
| 3204 | * PNG_IMAGE_FLAG_COLORSPACE_NOT_sRGB for color format images where the RGB |
| 3205 | * values do not correspond to the colors in sRGB. |
Glenn Randers-Pehrson | 871b1d0 | 2013-03-02 14:58:22 -0600 | [diff] [blame] | 3206 | * colormap_entries: set to the number of entries in the color-map (0 to 256) |
John Bowler | 7875d53 | 2011-11-07 22:33:49 -0600 | [diff] [blame] | 3207 | */ |
| 3208 | PNG_EXPORT(239, int, png_image_write_to_file, (png_imagep image, |
| 3209 | const char *file, int convert_to_8bit, const void *buffer, |
Glenn Randers-Pehrson | 871b1d0 | 2013-03-02 14:58:22 -0600 | [diff] [blame] | 3210 | png_int_32 row_stride, const void *colormap)); |
John Bowler | 7875d53 | 2011-11-07 22:33:49 -0600 | [diff] [blame] | 3211 | /* Write the image to the named file. */ |
| 3212 | |
| 3213 | PNG_EXPORT(240, int, png_image_write_to_stdio, (png_imagep image, FILE *file, |
Glenn Randers-Pehrson | 871b1d0 | 2013-03-02 14:58:22 -0600 | [diff] [blame] | 3214 | int convert_to_8_bit, const void *buffer, png_int_32 row_stride, |
| 3215 | const void *colormap)); |
John Bowler | 7875d53 | 2011-11-07 22:33:49 -0600 | [diff] [blame] | 3216 | /* Write the image to the given (FILE*). */ |
| 3217 | |
Glenn Randers-Pehrson | 871b1d0 | 2013-03-02 14:58:22 -0600 | [diff] [blame] | 3218 | /* With both write APIs if image is in one of the linear formats with 16-bit |
| 3219 | * data then setting convert_to_8_bit will cause the output to be an 8-bit PNG |
| 3220 | * gamma encoded according to the sRGB specification, otherwise a 16-bit linear |
| 3221 | * encoded PNG file is written. |
| 3222 | * |
| 3223 | * With color-mapped data formats the colormap parameter point to a color-map |
| 3224 | * with at least image->colormap_entries encoded in the specified format. If |
| 3225 | * the format is linear the written PNG color-map will be converted to sRGB |
| 3226 | * regardless of the convert_to_8_bit flag. |
John Bowler | 7875d53 | 2011-11-07 22:33:49 -0600 | [diff] [blame] | 3227 | * |
| 3228 | * With all APIs row_stride is handled as in the read APIs - it is the spacing |
Glenn Randers-Pehrson | 871b1d0 | 2013-03-02 14:58:22 -0600 | [diff] [blame] | 3229 | * from one row to the next in component sized units (1 or 2 bytes) and if |
| 3230 | * negative indicates a bottom-up row layout in the buffer. |
Glenn Randers-Pehrson | 84b0da9 | 2011-11-10 06:32:19 -0600 | [diff] [blame] | 3231 | * |
Glenn Randers-Pehrson | 871b1d0 | 2013-03-02 14:58:22 -0600 | [diff] [blame] | 3232 | * Note that the write API does not support interlacing or sub-8-bit pixels. |
John Bowler | 7875d53 | 2011-11-07 22:33:49 -0600 | [diff] [blame] | 3233 | */ |
Glenn Randers-Pehrson | 4a43182 | 2013-06-05 23:41:49 -0500 | [diff] [blame] | 3234 | #endif /* PNG_STDIO_SUPPORTED */ |
John Bowler | 7875d53 | 2011-11-07 22:33:49 -0600 | [diff] [blame] | 3235 | #endif /* PNG_SIMPLIFIED_WRITE_SUPPORTED */ |
| 3236 | /******************************************************************************* |
| 3237 | * END OF SIMPLIFIED API |
| 3238 | ******************************************************************************/ |
| 3239 | |
Glenn Randers-Pehrson | 871b1d0 | 2013-03-02 14:58:22 -0600 | [diff] [blame] | 3240 | #ifdef PNG_CHECK_FOR_INVALID_INDEX_SUPPORTED |
| 3241 | PNG_EXPORT(242, void, png_set_check_for_invalid_index, |
| 3242 | (png_structrp png_ptr, int allowed)); |
| 3243 | # ifdef PNG_GET_PALETTE_MAX_SUPPORTED |
| 3244 | PNG_EXPORT(243, int, png_get_palette_max, (png_const_structp png_ptr, |
| 3245 | png_const_infop info_ptr)); |
| 3246 | # endif |
| 3247 | #endif /* CHECK_FOR_INVALID_INDEX */ |
| 3248 | |
John Bowler | f372810 | 2013-03-04 16:26:31 -0600 | [diff] [blame] | 3249 | /******************************************************************************* |
| 3250 | * IMPLEMENTATION OPTIONS |
| 3251 | ******************************************************************************* |
| 3252 | * |
| 3253 | * Support for arbitrary implementation-specific optimizations. The API allows |
| 3254 | * particular options to be turned on or off. 'Option' is the number of the |
| 3255 | * option and 'onoff' is 0 (off) or non-0 (on). The value returned is given |
| 3256 | * by the PNG_OPTION_ defines below. |
| 3257 | * |
| 3258 | * HARDWARE: normally hardware capabilites, such as the Intel SSE instructions, |
| 3259 | * are detected at run time, however sometimes it may be impossible |
| 3260 | * to do this in user mode, in which case it is necessary to discover |
| 3261 | * the capabilities in an OS specific way. Such capabilities are |
| 3262 | * listed here when libpng has support for them and must be turned |
| 3263 | * ON by the application if present. |
| 3264 | * |
| 3265 | * SOFTWARE: sometimes software optimizations actually result in performance |
| 3266 | * decrease on some architectures or systems, or with some sets of |
| 3267 | * PNG images. 'Software' options allow such optimizations to be |
| 3268 | * selected at run time. |
| 3269 | */ |
| 3270 | #ifdef PNG_SET_OPTION_SUPPORTED |
| 3271 | #ifdef PNG_ARM_NEON_API_SUPPORTED |
| 3272 | # define PNG_ARM_NEON 0 /* HARDWARE: ARM Neon SIMD instructions supported */ |
| 3273 | #endif |
John Bowler | 0c7ac06 | 2013-05-07 21:59:05 -0500 | [diff] [blame] | 3274 | #define PNG_MAXIMUM_INFLATE_WINDOW 2 /* SOFTWARE: force maximum window */ |
| 3275 | #define PNG_OPTION_NEXT 4 /* Next option - numbers must be even */ |
John Bowler | f372810 | 2013-03-04 16:26:31 -0600 | [diff] [blame] | 3276 | |
| 3277 | /* Return values: NOTE: there are four values and 'off' is *not* zero */ |
| 3278 | #define PNG_OPTION_UNSET 0 /* Unset - defaults to off */ |
| 3279 | #define PNG_OPTION_INVALID 1 /* Option number out of range */ |
| 3280 | #define PNG_OPTION_OFF 2 |
| 3281 | #define PNG_OPTION_ON 3 |
| 3282 | |
| 3283 | PNG_EXPORT(244, int, png_set_option, (png_structrp png_ptr, int option, |
| 3284 | int onoff)); |
| 3285 | #endif |
| 3286 | |
| 3287 | /******************************************************************************* |
| 3288 | * END OF HARDWARE OPTIONS |
| 3289 | ******************************************************************************/ |
| 3290 | |
Glenn Randers-Pehrson | 31aee0d | 2010-07-29 17:39:14 -0500 | [diff] [blame] | 3291 | /* Maintainer: Put new public prototypes here ^, in libpng.3, and project |
Glenn Randers-Pehrson | 871b1d0 | 2013-03-02 14:58:22 -0600 | [diff] [blame] | 3292 | * defs, scripts/pnglibconf.h, and scripts/pnglibconf.h.prebuilt |
Glenn Randers-Pehrson | 31aee0d | 2010-07-29 17:39:14 -0500 | [diff] [blame] | 3293 | */ |
| 3294 | |
Glenn Randers-Pehrson | 9f044c1 | 2010-12-07 14:59:43 -0600 | [diff] [blame] | 3295 | /* The last ordinal number (this is the *last* one already used; the next |
John Bowler | 71a10f2 | 2011-01-22 17:03:33 -0600 | [diff] [blame] | 3296 | * one to use is one more than this.) Maintainer, remember to add an entry to |
| 3297 | * scripts/symbols.def as well. |
Glenn Randers-Pehrson | c551c0d | 2010-03-16 07:52:34 -0500 | [diff] [blame] | 3298 | */ |
| 3299 | #ifdef PNG_EXPORT_LAST_ORDINAL |
John Bowler | f372810 | 2013-03-04 16:26:31 -0600 | [diff] [blame] | 3300 | PNG_EXPORT_LAST_ORDINAL(244); |
Glenn Randers-Pehrson | c551c0d | 2010-03-16 07:52:34 -0500 | [diff] [blame] | 3301 | #endif |
| 3302 | |
Andreas Dilger | 02ad0ef | 1997-01-17 01:34:35 -0600 | [diff] [blame] | 3303 | #ifdef __cplusplus |
| 3304 | } |
| 3305 | #endif |
| 3306 | |
Glenn Randers-Pehrson | 1ef65b6 | 2000-05-12 06:19:53 -0500 | [diff] [blame] | 3307 | #endif /* PNG_VERSION_INFO_ONLY */ |
Glenn Randers-Pehrson | 6c7a09a | 2009-06-15 21:57:39 -0500 | [diff] [blame] | 3308 | /* Do not put anything past this line */ |
Glenn Randers-Pehrson | 1394480 | 2000-06-24 07:42:42 -0500 | [diff] [blame] | 3309 | #endif /* PNG_H */ |