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 | a7428d4 | 2011-06-17 19:07:04 -0500 | [diff] [blame] | 4 | * libpng version 1.5.4beta05 - June 18, 2011 |
Glenn Randers-Pehrson | 64b863c | 2011-01-04 09:57:06 -0600 | [diff] [blame] | 5 | * Copyright (c) 1998-2011 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 | a7428d4 | 2011-06-17 19:07:04 -0500 | [diff] [blame] | 14 | * libpng versions 0.97, January 1998, through 1.5.4beta05 - June 18, 2011: 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 | 3fb7c07 | 2011-06-16 09:24:02 -0500 | [diff] [blame] | 157 | * 1.5.4beta01-05 15 10504 15.so.15.4[.0] |
Glenn Randers-Pehrson | 520a764 | 2000-03-21 05:13:06 -0600 | [diff] [blame] | 158 | * |
Glenn Randers-Pehrson | eae8e36 | 2010-03-12 17:36:53 -0600 | [diff] [blame] | 159 | * Henceforth the source version will match the shared-library major |
| 160 | * and minor numbers; the shared-library major version number will be |
| 161 | * used for changes in backward compatibility, as it is intended. The |
| 162 | * PNG_LIBPNG_VER macro, which is not used within libpng but is available |
| 163 | * for applications, is an unsigned integer of the form xyyzz corresponding |
| 164 | * to the source version x.y.z (leading zeros in y and z). Beta versions |
| 165 | * were given the previous public release number plus a letter, until |
| 166 | * version 1.0.6j; from then on they were given the upcoming public |
| 167 | * release number plus "betaNN" or "rcN". |
Glenn Randers-Pehrson | 520a764 | 2000-03-21 05:13:06 -0600 | [diff] [blame] | 168 | * |
Glenn Randers-Pehrson | eae8e36 | 2010-03-12 17:36:53 -0600 | [diff] [blame] | 169 | * Binary incompatibility exists only when applications make direct access |
| 170 | * to the info_ptr or png_ptr members through png.h, and the compiled |
| 171 | * application is loaded with a different version of the library. |
Glenn Randers-Pehrson | 326320e | 2000-04-24 07:43:17 -0500 | [diff] [blame] | 172 | * |
Glenn Randers-Pehrson | eae8e36 | 2010-03-12 17:36:53 -0600 | [diff] [blame] | 173 | * DLLNUM will change each time there are forward or backward changes |
| 174 | * in binary compatibility (e.g., when a new feature is added). |
Glenn Randers-Pehrson | be9de0f | 2001-01-22 08:52:16 -0600 | [diff] [blame] | 175 | * |
Glenn Randers-Pehrson | f3abb2c | 2010-10-17 12:51:53 -0500 | [diff] [blame] | 176 | * See libpng-manual.txt or libpng.3 for more information. The PNG |
| 177 | * specification is available as a W3C Recommendation and as an ISO |
| 178 | * Specification, <http://www.w3.org/TR/2003/REC-PNG-20031110/ |
Glenn Randers-Pehrson | 520a764 | 2000-03-21 05:13:06 -0600 | [diff] [blame] | 179 | */ |
| 180 | |
| 181 | /* |
Glenn Randers-Pehrson | 68ea243 | 2000-04-01 21:10:05 -0600 | [diff] [blame] | 182 | * COPYRIGHT NOTICE, DISCLAIMER, and LICENSE: |
| 183 | * |
Glenn Randers-Pehrson | d436672 | 2000-06-04 14:29:29 -0500 | [diff] [blame] | 184 | * If you modify libpng you may insert additional notices immediately following |
| 185 | * this sentence. |
Glenn Randers-Pehrson | 520a764 | 2000-03-21 05:13:06 -0600 | [diff] [blame] | 186 | * |
Glenn Randers-Pehrson | bfbf865 | 2009-06-26 21:46:52 -0500 | [diff] [blame] | 187 | * This code is released under the libpng license. |
| 188 | * |
Glenn Randers-Pehrson | a7428d4 | 2011-06-17 19:07:04 -0500 | [diff] [blame] | 189 | * libpng versions 1.2.6, August 15, 2004, through 1.5.4beta05, June 18, 2011, are |
Glenn Randers-Pehrson | 64b863c | 2011-01-04 09:57:06 -0600 | [diff] [blame] | 190 | * Copyright (c) 2004, 2006-2011 Glenn Randers-Pehrson, and are |
Glenn Randers-Pehrson | 5fea36f | 2004-07-28 08:20:44 -0500 | [diff] [blame] | 191 | * 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] | 192 | * with the following individual added to the list of Contributing Authors: |
Glenn Randers-Pehrson | 5fea36f | 2004-07-28 08:20:44 -0500 | [diff] [blame] | 193 | * |
| 194 | * Cosmin Truta |
Glenn Randers-Pehrson | 5fea36f | 2004-07-28 08:20:44 -0500 | [diff] [blame] | 195 | * |
Glenn Randers-Pehrson | a4981d4 | 2004-08-25 22:00:45 -0500 | [diff] [blame] | 196 | * 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] | 197 | * Copyright (c) 2000-2002 Glenn Randers-Pehrson, and are |
Glenn Randers-Pehrson | 32fc5ce | 2000-07-24 06:34:14 -0500 | [diff] [blame] | 198 | * 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] | 199 | * with the following individuals added to the list of Contributing Authors: |
Glenn Randers-Pehrson | d436672 | 2000-06-04 14:29:29 -0500 | [diff] [blame] | 200 | * |
| 201 | * Simon-Pierre Cadieux |
| 202 | * Eric S. Raymond |
| 203 | * Gilles Vollant |
| 204 | * |
Glenn Randers-Pehrson | 3d5a520 | 2000-07-01 15:37:28 -0500 | [diff] [blame] | 205 | * and with the following additions to the disclaimer: |
| 206 | * |
| 207 | * There is no warranty against interference with your enjoyment of the |
| 208 | * library or against infringement. There is no warranty that our |
| 209 | * efforts or the library will fulfill any of your particular purposes |
| 210 | * or needs. This library is provided with all faults, and the entire |
| 211 | * risk of satisfactory quality, performance, accuracy, and effort is with |
| 212 | * the user. |
| 213 | * |
| 214 | * 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] | 215 | * Copyright (c) 1998, 1999, 2000 Glenn Randers-Pehrson, and are |
Glenn Randers-Pehrson | c36bb79 | 2011-02-12 09:49:07 -0600 | [diff] [blame] | 216 | * 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] | 217 | * with the following individuals added to the list of Contributing Authors: |
| 218 | * |
| 219 | * Tom Lane |
| 220 | * Glenn Randers-Pehrson |
| 221 | * Willem van Schaik |
| 222 | * |
| 223 | * 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] | 224 | * Copyright (c) 1996, 1997 Andreas Dilger |
Glenn Randers-Pehrson | c36bb79 | 2011-02-12 09:49:07 -0600 | [diff] [blame] | 225 | * 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] | 226 | * with the following individuals added to the list of Contributing Authors: |
Glenn Randers-Pehrson | 520a764 | 2000-03-21 05:13:06 -0600 | [diff] [blame] | 227 | * |
| 228 | * John Bowler |
| 229 | * Kevin Bracey |
| 230 | * Sam Bushell |
Glenn Randers-Pehrson | 520a764 | 2000-03-21 05:13:06 -0600 | [diff] [blame] | 231 | * Magnus Holmgren |
Glenn Randers-Pehrson | 520a764 | 2000-03-21 05:13:06 -0600 | [diff] [blame] | 232 | * Greg Roelofs |
Glenn Randers-Pehrson | d436672 | 2000-06-04 14:29:29 -0500 | [diff] [blame] | 233 | * Tom Tanner |
| 234 | * |
| 235 | * libpng versions 0.5, May 1995, through 0.88, January 1996, are |
| 236 | * Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc. |
| 237 | * |
| 238 | * For the purposes of this copyright and license, "Contributing Authors" |
| 239 | * is defined as the following set of individuals: |
| 240 | * |
| 241 | * Andreas Dilger |
| 242 | * Dave Martindale |
Glenn Randers-Pehrson | 520a764 | 2000-03-21 05:13:06 -0600 | [diff] [blame] | 243 | * Guy Eric Schalnat |
| 244 | * Paul Schmidt |
Glenn Randers-Pehrson | 520a764 | 2000-03-21 05:13:06 -0600 | [diff] [blame] | 245 | * Tim Wegner |
| 246 | * |
| 247 | * The PNG Reference Library is supplied "AS IS". The Contributing Authors |
Glenn Randers-Pehrson | c36bb79 | 2011-02-12 09:49:07 -0600 | [diff] [blame] | 248 | * and Group 42, Inc. disclaim all warranties, expressed or implied, |
Glenn Randers-Pehrson | 520a764 | 2000-03-21 05:13:06 -0600 | [diff] [blame] | 249 | * including, without limitation, the warranties of merchantability and of |
| 250 | * fitness for any purpose. The Contributing Authors and Group 42, Inc. |
Glenn Randers-Pehrson | c36bb79 | 2011-02-12 09:49:07 -0600 | [diff] [blame] | 251 | * assume no liability for direct, indirect, incidental, special, exemplary, |
Glenn Randers-Pehrson | 520a764 | 2000-03-21 05:13:06 -0600 | [diff] [blame] | 252 | * or consequential damages, which may result from the use of the PNG |
| 253 | * Reference Library, even if advised of the possibility of such damage. |
| 254 | * |
| 255 | * Permission is hereby granted to use, copy, modify, and distribute this |
| 256 | * source code, or portions hereof, for any purpose, without fee, subject |
| 257 | * to the following restrictions: |
| 258 | * |
Glenn Randers-Pehrson | eae8e36 | 2010-03-12 17:36:53 -0600 | [diff] [blame] | 259 | * 1. The origin of this source code must not be misrepresented. |
Glenn Randers-Pehrson | 520a764 | 2000-03-21 05:13:06 -0600 | [diff] [blame] | 260 | * |
Glenn Randers-Pehrson | 53c07f5 | 2010-06-18 18:55:55 -0500 | [diff] [blame] | 261 | * 2. Altered versions must be plainly marked as such and must not |
| 262 | * be misrepresented as being the original source. |
Glenn Randers-Pehrson | 520a764 | 2000-03-21 05:13:06 -0600 | [diff] [blame] | 263 | * |
Glenn Randers-Pehrson | eae8e36 | 2010-03-12 17:36:53 -0600 | [diff] [blame] | 264 | * 3. This Copyright notice may not be removed or altered from |
| 265 | * any source or altered source distribution. |
Glenn Randers-Pehrson | 520a764 | 2000-03-21 05:13:06 -0600 | [diff] [blame] | 266 | * |
| 267 | * The Contributing Authors and Group 42, Inc. specifically permit, without |
| 268 | * fee, and encourage the use of this source code as a component to |
| 269 | * supporting the PNG file format in commercial products. If you use this |
| 270 | * source code in a product, acknowledgment is not required but would be |
| 271 | * appreciated. |
| 272 | */ |
| 273 | |
| 274 | /* |
| 275 | * A "png_get_copyright" function is available, for convenient use in "about" |
| 276 | * boxes and the like: |
| 277 | * |
Glenn Randers-Pehrson | 23d3970 | 2010-12-06 18:28:02 -0600 | [diff] [blame] | 278 | * printf("%s", png_get_copyright(NULL)); |
Glenn Randers-Pehrson | 520a764 | 2000-03-21 05:13:06 -0600 | [diff] [blame] | 279 | * |
| 280 | * 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] | 281 | * files "pngbar.png" and "pngbar.jpg (88x31) and "pngnow.png" (98x31). |
Glenn Randers-Pehrson | 520a764 | 2000-03-21 05:13:06 -0600 | [diff] [blame] | 282 | */ |
| 283 | |
| 284 | /* |
| 285 | * Libpng is OSI Certified Open Source Software. OSI Certified is a |
| 286 | * certification mark of the Open Source Initiative. |
| 287 | */ |
| 288 | |
| 289 | /* |
| 290 | * The contributing authors would like to thank all those who helped |
| 291 | * with testing, bug fixes, and patience. This wouldn't have been |
| 292 | * possible without all of you. |
| 293 | * |
| 294 | * Thanks to Frank J. T. Wojcik for helping with the documentation. |
| 295 | */ |
| 296 | |
| 297 | /* |
Glenn Randers-Pehrson | 87544ac | 1999-01-13 22:06:39 -0600 | [diff] [blame] | 298 | * Y2K compliance in libpng: |
| 299 | * ========================= |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame] | 300 | * |
Glenn Randers-Pehrson | a7428d4 | 2011-06-17 19:07:04 -0500 | [diff] [blame] | 301 | * June 18, 2011 |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame] | 302 | * |
Glenn Randers-Pehrson | 87544ac | 1999-01-13 22:06:39 -0600 | [diff] [blame] | 303 | * Since the PNG Development group is an ad-hoc body, we can't make |
| 304 | * an official declaration. |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame] | 305 | * |
Glenn Randers-Pehrson | 4393a9a | 1999-09-17 12:27:26 -0500 | [diff] [blame] | 306 | * This is your unofficial assurance that libpng from version 0.71 and |
Glenn Randers-Pehrson | 3fb7c07 | 2011-06-16 09:24:02 -0500 | [diff] [blame] | 307 | * upward through 1.5.4beta05 are Y2K compliant. It is my belief that |
Glenn Randers-Pehrson | 31aee0d | 2010-07-29 17:39:14 -0500 | [diff] [blame] | 308 | * earlier versions were also Y2K compliant. |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame] | 309 | * |
John Bowler | 88b77cc | 2011-05-05 06:49:55 -0500 | [diff] [blame] | 310 | * Libpng only has two year fields. One is a 2-byte unsigned integer |
| 311 | * that will hold years up to 65535. The other holds the date in text |
Glenn Randers-Pehrson | 87544ac | 1999-01-13 22:06:39 -0600 | [diff] [blame] | 312 | * format, and will hold years up to 9999. |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame] | 313 | * |
Glenn Randers-Pehrson | 87544ac | 1999-01-13 22:06:39 -0600 | [diff] [blame] | 314 | * The integer is |
| 315 | * "png_uint_16 year" in png_time_struct. |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame] | 316 | * |
John Bowler | 88b77cc | 2011-05-05 06:49:55 -0500 | [diff] [blame] | 317 | * The string is |
| 318 | * "png_char time_buffer" in png_struct |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame] | 319 | * |
Glenn Randers-Pehrson | 87544ac | 1999-01-13 22:06:39 -0600 | [diff] [blame] | 320 | * There are seven time-related functions: |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame] | 321 | * png.c: png_convert_to_rfc_1123() in png.c |
Glenn Randers-Pehrson | 87544ac | 1999-01-13 22:06:39 -0600 | [diff] [blame] | 322 | * (formerly png_convert_to_rfc_1152() in error) |
| 323 | * png_convert_from_struct_tm() in pngwrite.c, called in pngwrite.c |
| 324 | * png_convert_from_time_t() in pngwrite.c |
| 325 | * png_get_tIME() in pngget.c |
| 326 | * png_handle_tIME() in pngrutil.c, called in pngread.c |
| 327 | * png_set_tIME() in pngset.c |
| 328 | * png_write_tIME() in pngwutil.c, called in pngwrite.c |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame] | 329 | * |
| 330 | * All handle dates properly in a Y2K environment. The |
Glenn Randers-Pehrson | 87544ac | 1999-01-13 22:06:39 -0600 | [diff] [blame] | 331 | * png_convert_from_time_t() function calls gmtime() to convert from system |
| 332 | * clock time, which returns (year - 1900), which we properly convert to |
| 333 | * the full 4-digit year. There is a possibility that applications using |
| 334 | * libpng are not passing 4-digit years into the png_convert_to_rfc_1123() |
Glenn Randers-Pehrson | 4393a9a | 1999-09-17 12:27:26 -0500 | [diff] [blame] | 335 | * 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] | 336 | * 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] | 337 | * but this is not under our control. The libpng documentation has always |
| 338 | * stated that it works with 4-digit years, and the APIs have been |
| 339 | * documented as such. |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame] | 340 | * |
Glenn Randers-Pehrson | 87544ac | 1999-01-13 22:06:39 -0600 | [diff] [blame] | 341 | * The tIME chunk itself is also Y2K compliant. It uses a 2-byte unsigned |
| 342 | * 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] | 343 | * |
Glenn Randers-Pehrson | 4393a9a | 1999-09-17 12:27:26 -0500 | [diff] [blame] | 344 | * zlib, upon which libpng depends, is also Y2K compliant. It contains |
| 345 | * no date-related code. |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame] | 346 | * |
Glenn Randers-Pehrson | 87544ac | 1999-01-13 22:06:39 -0600 | [diff] [blame] | 347 | * Glenn Randers-Pehrson |
| 348 | * libpng maintainer |
| 349 | * PNG Development Group |
Glenn Randers-Pehrson | bcfd15d | 1999-10-01 14:22:25 -0500 | [diff] [blame] | 350 | */ |
| 351 | |
Glenn Randers-Pehrson | 1394480 | 2000-06-24 07:42:42 -0500 | [diff] [blame] | 352 | #ifndef PNG_H |
| 353 | #define PNG_H |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 354 | |
Glenn Randers-Pehrson | f3abb2c | 2010-10-17 12:51:53 -0500 | [diff] [blame] | 355 | /* 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] | 356 | * describes how to use libpng, and the file example.c summarizes it |
| 357 | * with some code on which to build. This file is useful for looking |
| 358 | * at the actual function definitions and structure components. |
| 359 | */ |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 360 | |
Glenn Randers-Pehrson | 1ef65b6 | 2000-05-12 06:19:53 -0500 | [diff] [blame] | 361 | /* Version information for png.h - this should match the version in png.c */ |
Glenn Randers-Pehrson | 3fb7c07 | 2011-06-16 09:24:02 -0500 | [diff] [blame] | 362 | #define PNG_LIBPNG_VER_STRING "1.5.4beta05" |
Glenn Randers-Pehrson | 5b5dcf8 | 2004-07-17 22:45:44 -0500 | [diff] [blame] | 363 | #define PNG_HEADER_VERSION_STRING \ |
Glenn Randers-Pehrson | a7428d4 | 2011-06-17 19:07:04 -0500 | [diff] [blame] | 364 | " libpng version 1.5.4beta05 - June 18, 2011\n" |
Glenn Randers-Pehrson | 1ef65b6 | 2000-05-12 06:19:53 -0500 | [diff] [blame] | 365 | |
Glenn Randers-Pehrson | f1eb918 | 2010-02-08 15:36:41 -0600 | [diff] [blame] | 366 | #define PNG_LIBPNG_VER_SONUM 15 |
| 367 | #define PNG_LIBPNG_VER_DLLNUM 15 |
Glenn Randers-Pehrson | 1ef65b6 | 2000-05-12 06:19:53 -0500 | [diff] [blame] | 368 | |
| 369 | /* These should match the first 3 components of PNG_LIBPNG_VER_STRING: */ |
| 370 | #define PNG_LIBPNG_VER_MAJOR 1 |
Glenn Randers-Pehrson | e3f3c4e | 2010-02-07 18:08:50 -0600 | [diff] [blame] | 371 | #define PNG_LIBPNG_VER_MINOR 5 |
Glenn Randers-Pehrson | 97039ba | 2011-06-13 20:07:27 -0500 | [diff] [blame] | 372 | #define PNG_LIBPNG_VER_RELEASE 4 |
Glenn Randers-Pehrson | 1ef65b6 | 2000-05-12 06:19:53 -0500 | [diff] [blame] | 373 | /* This should match the numeric part of the final component of |
Glenn Randers-Pehrson | 6c7a09a | 2009-06-15 21:57:39 -0500 | [diff] [blame] | 374 | * PNG_LIBPNG_VER_STRING, omitting any leading zero: |
| 375 | */ |
Glenn Randers-Pehrson | d56aca7 | 2000-11-23 11:51:42 -0600 | [diff] [blame] | 376 | |
Glenn Randers-Pehrson | 3fb7c07 | 2011-06-16 09:24:02 -0500 | [diff] [blame] | 377 | #define PNG_LIBPNG_VER_BUILD 05 |
Glenn Randers-Pehrson | d56aca7 | 2000-11-23 11:51:42 -0600 | [diff] [blame] | 378 | |
Glenn Randers-Pehrson | 4093607 | 2004-11-20 11:18:40 -0600 | [diff] [blame] | 379 | /* Release Status */ |
Glenn Randers-Pehrson | d56aca7 | 2000-11-23 11:51:42 -0600 | [diff] [blame] | 380 | #define PNG_LIBPNG_BUILD_ALPHA 1 |
| 381 | #define PNG_LIBPNG_BUILD_BETA 2 |
| 382 | #define PNG_LIBPNG_BUILD_RC 3 |
| 383 | #define PNG_LIBPNG_BUILD_STABLE 4 |
Glenn Randers-Pehrson | 4093607 | 2004-11-20 11:18:40 -0600 | [diff] [blame] | 384 | #define PNG_LIBPNG_BUILD_RELEASE_STATUS_MASK 7 |
Glenn Randers-Pehrson | beb572e | 2006-08-19 13:59:24 -0500 | [diff] [blame] | 385 | |
Glenn Randers-Pehrson | 4093607 | 2004-11-20 11:18:40 -0600 | [diff] [blame] | 386 | /* Release-Specific Flags */ |
| 387 | #define PNG_LIBPNG_BUILD_PATCH 8 /* Can be OR'ed with |
| 388 | PNG_LIBPNG_BUILD_STABLE only */ |
| 389 | #define PNG_LIBPNG_BUILD_PRIVATE 16 /* Cannot be OR'ed with |
| 390 | PNG_LIBPNG_BUILD_SPECIAL */ |
| 391 | #define PNG_LIBPNG_BUILD_SPECIAL 32 /* Cannot be OR'ed with |
| 392 | PNG_LIBPNG_BUILD_PRIVATE */ |
Glenn Randers-Pehrson | 1ef65b6 | 2000-05-12 06:19:53 -0500 | [diff] [blame] | 393 | |
Glenn Randers-Pehrson | 1721829 | 2006-04-20 07:20:46 -0500 | [diff] [blame] | 394 | #define PNG_LIBPNG_BUILD_BASE_TYPE PNG_LIBPNG_BUILD_BETA |
Glenn Randers-Pehrson | 5dd2b8e | 2004-11-24 07:50:16 -0600 | [diff] [blame] | 395 | |
Glenn Randers-Pehrson | 1ef65b6 | 2000-05-12 06:19:53 -0500 | [diff] [blame] | 396 | /* Careful here. At one time, Guy wanted to use 082, but that would be octal. |
| 397 | * We must not include leading zeros. |
| 398 | * Versions 0.7 through 1.0.0 were in the range 0 to 100 here (only |
| 399 | * 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] | 400 | * version 1.0.1 it's xxyyzz, where x=major, y=minor, z=release |
| 401 | */ |
Glenn Randers-Pehrson | 97039ba | 2011-06-13 20:07:27 -0500 | [diff] [blame] | 402 | #define PNG_LIBPNG_VER 10504 /* 1.5.4 */ |
Glenn Randers-Pehrson | 1ef65b6 | 2000-05-12 06:19:53 -0500 | [diff] [blame] | 403 | |
Glenn Randers-Pehrson | 862cb20 | 2010-04-16 22:12:51 -0500 | [diff] [blame] | 404 | /* Library configuration: these options cannot be changed after |
| 405 | * the library has been built. |
| 406 | */ |
| 407 | #ifndef PNGLCONF_H |
Glenn Randers-Pehrson | 8c66786 | 2010-08-24 16:16:35 -0500 | [diff] [blame] | 408 | /* If pnglibconf.h is missing, you can |
| 409 | * copy scripts/pnglibconf.h.prebuilt to pnglibconf.h |
| 410 | */ |
Glenn Randers-Pehrson | 98b4f00 | 2010-04-16 22:30:26 -0500 | [diff] [blame] | 411 | # include "pnglibconf.h" |
Glenn Randers-Pehrson | 5dd2b8e | 2004-11-24 07:50:16 -0600 | [diff] [blame] | 412 | #endif |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 413 | |
Glenn Randers-Pehrson | 862cb20 | 2010-04-16 22:12:51 -0500 | [diff] [blame] | 414 | #ifndef PNG_VERSION_INFO_ONLY |
Glenn Randers-Pehrson | 80de04e | 2011-03-24 23:06:26 -0500 | [diff] [blame] | 415 | # ifndef PNG_BUILDING_SYMBOL_TABLE |
| 416 | /* |
| 417 | * Standard header files (not needed for the version info or while |
| 418 | * building symbol table -- see scripts/pnglibconf.dfa) |
| 419 | */ |
| 420 | # ifdef PNG_SETJMP_SUPPORTED |
| 421 | # include <setjmp.h> |
| 422 | # endif |
Glenn Randers-Pehrson | 862cb20 | 2010-04-16 22:12:51 -0500 | [diff] [blame] | 423 | |
Glenn Randers-Pehrson | 80de04e | 2011-03-24 23:06:26 -0500 | [diff] [blame] | 424 | /* Need the time information for converting tIME chunks, it |
| 425 | * defines struct tm: |
| 426 | */ |
| 427 | # ifdef PNG_CONVERT_tIME_SUPPORTED |
| 428 | /* "time.h" functions are not supported on all operating systems */ |
| 429 | # include <time.h> |
| 430 | # endif |
| 431 | # endif |
Glenn Randers-Pehrson | 862cb20 | 2010-04-16 22:12:51 -0500 | [diff] [blame] | 432 | |
| 433 | /* Machine specific configuration. */ |
| 434 | # include "pngconf.h" |
| 435 | #endif |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 436 | |
Glenn Randers-Pehrson | 5dd2b8e | 2004-11-24 07:50:16 -0600 | [diff] [blame] | 437 | /* |
Glenn Randers-Pehrson | 6c7a09a | 2009-06-15 21:57:39 -0500 | [diff] [blame] | 438 | * Added at libpng-1.2.8 |
| 439 | * |
| 440 | * Ref MSDN: Private as priority over Special |
Glenn Randers-Pehrson | 5dd2b8e | 2004-11-24 07:50:16 -0600 | [diff] [blame] | 441 | * VS_FF_PRIVATEBUILD File *was not* built using standard release |
| 442 | * procedures. If this value is given, the StringFileInfo block must |
Glenn Randers-Pehrson | beb572e | 2006-08-19 13:59:24 -0500 | [diff] [blame] | 443 | * contain a PrivateBuild string. |
Glenn Randers-Pehrson | 5dd2b8e | 2004-11-24 07:50:16 -0600 | [diff] [blame] | 444 | * |
| 445 | * VS_FF_SPECIALBUILD File *was* built by the original company using |
| 446 | * standard release procedures but is a variation of the standard |
| 447 | * 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] | 448 | * StringFileInfo block must contain a SpecialBuild string. |
Glenn Randers-Pehrson | 5dd2b8e | 2004-11-24 07:50:16 -0600 | [diff] [blame] | 449 | */ |
| 450 | |
Glenn Randers-Pehrson | 98b4f00 | 2010-04-16 22:30:26 -0500 | [diff] [blame] | 451 | #ifdef PNG_USER_PRIVATEBUILD /* From pnglibconf.h */ |
Glenn Randers-Pehrson | 9c3ab68 | 2006-02-20 22:09:05 -0600 | [diff] [blame] | 452 | # define PNG_LIBPNG_BUILD_TYPE \ |
Glenn Randers-Pehrson | eae8e36 | 2010-03-12 17:36:53 -0600 | [diff] [blame] | 453 | (PNG_LIBPNG_BUILD_BASE_TYPE | PNG_LIBPNG_BUILD_PRIVATE) |
Glenn Randers-Pehrson | 5dd2b8e | 2004-11-24 07:50:16 -0600 | [diff] [blame] | 454 | #else |
Glenn Randers-Pehrson | 4e6b5e9 | 2009-09-23 10:24:53 -0500 | [diff] [blame] | 455 | # ifdef PNG_LIBPNG_SPECIALBUILD |
Glenn Randers-Pehrson | 9c3ab68 | 2006-02-20 22:09:05 -0600 | [diff] [blame] | 456 | # define PNG_LIBPNG_BUILD_TYPE \ |
Glenn Randers-Pehrson | eae8e36 | 2010-03-12 17:36:53 -0600 | [diff] [blame] | 457 | (PNG_LIBPNG_BUILD_BASE_TYPE | PNG_LIBPNG_BUILD_SPECIAL) |
Glenn Randers-Pehrson | 5dd2b8e | 2004-11-24 07:50:16 -0600 | [diff] [blame] | 458 | # else |
Glenn Randers-Pehrson | 9c3ab68 | 2006-02-20 22:09:05 -0600 | [diff] [blame] | 459 | # define PNG_LIBPNG_BUILD_TYPE (PNG_LIBPNG_BUILD_BASE_TYPE) |
Glenn Randers-Pehrson | 5dd2b8e | 2004-11-24 07:50:16 -0600 | [diff] [blame] | 460 | # endif |
| 461 | #endif |
| 462 | |
| 463 | #ifndef PNG_VERSION_INFO_ONLY |
| 464 | |
Glenn Randers-Pehrson | 4393a9a | 1999-09-17 12:27:26 -0500 | [diff] [blame] | 465 | /* Inhibit C++ name-mangling for libpng functions but not for system calls. */ |
| 466 | #ifdef __cplusplus |
| 467 | extern "C" { |
| 468 | #endif /* __cplusplus */ |
| 469 | |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 470 | /* Version information for C files, stored in png.c. This had better match |
| 471 | * the version above. |
| 472 | */ |
Glenn Randers-Pehrson | 4c8f726 | 2010-03-16 19:30:01 -0500 | [diff] [blame] | 473 | #define png_libpng_ver png_get_header_ver(NULL) |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 474 | |
Glenn Randers-Pehrson | 862cb20 | 2010-04-16 22:12:51 -0500 | [diff] [blame] | 475 | /* This file is arranged in several sections: |
| 476 | * |
| 477 | * 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] | 478 | * 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] | 479 | * 2. Type definitions (base types are defined in pngconf.h), structure |
| 480 | * definitions. |
| 481 | * 3. Exported library functions. |
| 482 | * |
| 483 | * The library source code has additional files (principally pngpriv.h) that |
| 484 | * allow configuration of the library. |
| 485 | */ |
| 486 | /* Section 1: run time configuration |
Glenn Randers-Pehrson | 98b4f00 | 2010-04-16 22:30:26 -0500 | [diff] [blame] | 487 | * See pnglibconf.h for build time configuration |
Glenn Randers-Pehrson | 862cb20 | 2010-04-16 22:12:51 -0500 | [diff] [blame] | 488 | * |
| 489 | * Run time configuration allows the application to choose between |
| 490 | * implementations of certain arithmetic APIs. The default is set |
Glenn Randers-Pehrson | 98b4f00 | 2010-04-16 22:30:26 -0500 | [diff] [blame] | 491 | * 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] | 492 | * override these (and only these) settings. Note that this won't |
| 493 | * change what the library does, only application code, and the |
| 494 | * settings can (and probably should) be made on a per-file basis |
| 495 | * by setting the #defines before including png.h |
| 496 | * |
| 497 | * Use macros to read integers from PNG data or use the exported |
| 498 | * functions? |
| 499 | * PNG_USE_READ_MACROS: use the macros (see below) Note that |
| 500 | * the macros evaluate their argument multiple times. |
| 501 | * PNG_NO_USE_READ_MACROS: call the relevant library function. |
| 502 | * |
| 503 | * Use the alternative algorithm for compositing alpha samples that |
| 504 | * does not use division? |
| 505 | * PNG_READ_COMPOSITE_NODIV_SUPPORTED: use the 'no division' |
| 506 | * algorithm. |
| 507 | * PNG_NO_READ_COMPOSITE_NODIV: use the 'division' algorithm. |
| 508 | * |
| 509 | * How to handle benign errors if PNG_ALLOW_BENIGN_ERRORS is |
| 510 | * false? |
| 511 | * PNG_ALLOW_BENIGN_ERRORS: map calls to the benign error |
| 512 | * APIs to png_warning. |
| 513 | * Otherwise the calls are mapped to png_error. |
| 514 | */ |
| 515 | |
| 516 | /* Section 2: type definitions, including structures and compile time |
| 517 | * constants. |
| 518 | * See pngconf.h for base types that vary by machine/system |
| 519 | */ |
Glenn Randers-Pehrson | 88910f5 | 2010-10-16 20:38:45 -0500 | [diff] [blame] | 520 | |
| 521 | /* This triggers a compiler error in png.c, if png.c and png.h |
| 522 | * do not agree upon the version number. |
| 523 | */ |
Glenn Randers-Pehrson | 3fb7c07 | 2011-06-16 09:24:02 -0500 | [diff] [blame] | 524 | typedef char* png_libpng_version_1_5_4beta05; |
Glenn Randers-Pehrson | 88910f5 | 2010-10-16 20:38:45 -0500 | [diff] [blame] | 525 | |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 526 | /* Three color definitions. The order of the red, green, and blue, (and the |
| 527 | * exact size) is not important, although the size of the fields need to |
| 528 | * be png_byte or png_uint_16 (as defined below). |
| 529 | */ |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 530 | typedef struct png_color_struct |
| 531 | { |
Guy Schalnat | 4ee97b0 | 1996-01-16 01:51:56 -0600 | [diff] [blame] | 532 | png_byte red; |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 533 | png_byte green; |
| 534 | png_byte blue; |
| 535 | } png_color; |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 536 | typedef png_color FAR * png_colorp; |
Glenn Randers-Pehrson | e600c51 | 2010-08-18 07:25:46 -0500 | [diff] [blame] | 537 | typedef PNG_CONST png_color FAR * png_const_colorp; |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 538 | typedef png_color FAR * FAR * png_colorpp; |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 539 | |
| 540 | typedef struct png_color_16_struct |
| 541 | { |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 542 | png_byte index; /* used for palette files */ |
| 543 | png_uint_16 red; /* for use in red green blue files */ |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 544 | png_uint_16 green; |
| 545 | png_uint_16 blue; |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 546 | png_uint_16 gray; /* for use in grayscale files */ |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 547 | } png_color_16; |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 548 | typedef png_color_16 FAR * png_color_16p; |
Glenn Randers-Pehrson | e600c51 | 2010-08-18 07:25:46 -0500 | [diff] [blame] | 549 | typedef PNG_CONST png_color_16 FAR * png_const_color_16p; |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 550 | typedef png_color_16 FAR * FAR * png_color_16pp; |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 551 | |
| 552 | typedef struct png_color_8_struct |
| 553 | { |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 554 | png_byte red; /* for use in red green blue files */ |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 555 | png_byte green; |
| 556 | png_byte blue; |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 557 | png_byte gray; /* for use in grayscale files */ |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 558 | png_byte alpha; /* for alpha channel files */ |
| 559 | } png_color_8; |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 560 | typedef png_color_8 FAR * png_color_8p; |
Glenn Randers-Pehrson | e600c51 | 2010-08-18 07:25:46 -0500 | [diff] [blame] | 561 | typedef PNG_CONST png_color_8 FAR * png_const_color_8p; |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 562 | typedef png_color_8 FAR * FAR * png_color_8pp; |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 563 | |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame] | 564 | /* |
| 565 | * The following two structures are used for the in-core representation |
| 566 | * of sPLT chunks. |
| 567 | */ |
Glenn Randers-Pehrson | 520a764 | 2000-03-21 05:13:06 -0600 | [diff] [blame] | 568 | typedef struct png_sPLT_entry_struct |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame] | 569 | { |
| 570 | png_uint_16 red; |
| 571 | png_uint_16 green; |
| 572 | png_uint_16 blue; |
| 573 | png_uint_16 alpha; |
| 574 | png_uint_16 frequency; |
Glenn Randers-Pehrson | 520a764 | 2000-03-21 05:13:06 -0600 | [diff] [blame] | 575 | } png_sPLT_entry; |
| 576 | typedef png_sPLT_entry FAR * png_sPLT_entryp; |
Glenn Randers-Pehrson | e600c51 | 2010-08-18 07:25:46 -0500 | [diff] [blame] | 577 | typedef PNG_CONST png_sPLT_entry FAR * png_const_sPLT_entryp; |
Glenn Randers-Pehrson | 520a764 | 2000-03-21 05:13:06 -0600 | [diff] [blame] | 578 | typedef png_sPLT_entry FAR * FAR * png_sPLT_entrypp; |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame] | 579 | |
Glenn Randers-Pehrson | 4accabb | 2000-04-14 14:20:47 -0500 | [diff] [blame] | 580 | /* When the depth of the sPLT palette is 8 bits, the color and alpha samples |
| 581 | * occupy the LSB of their respective members, and the MSB of each member |
| 582 | * is zero-filled. The frequency member always occupies the full 16 bits. |
| 583 | */ |
| 584 | |
Glenn Randers-Pehrson | 520a764 | 2000-03-21 05:13:06 -0600 | [diff] [blame] | 585 | typedef struct png_sPLT_struct |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame] | 586 | { |
Glenn Randers-Pehrson | 4accabb | 2000-04-14 14:20:47 -0500 | [diff] [blame] | 587 | png_charp name; /* palette name */ |
| 588 | png_byte depth; /* depth of palette samples */ |
| 589 | png_sPLT_entryp entries; /* palette entries */ |
| 590 | png_int_32 nentries; /* number of palette entries */ |
Glenn Randers-Pehrson | 520a764 | 2000-03-21 05:13:06 -0600 | [diff] [blame] | 591 | } png_sPLT_t; |
| 592 | typedef png_sPLT_t FAR * png_sPLT_tp; |
Glenn Randers-Pehrson | e600c51 | 2010-08-18 07:25:46 -0500 | [diff] [blame] | 593 | typedef PNG_CONST png_sPLT_t FAR * png_const_sPLT_tp; |
Glenn Randers-Pehrson | 520a764 | 2000-03-21 05:13:06 -0600 | [diff] [blame] | 594 | typedef png_sPLT_t FAR * FAR * png_sPLT_tpp; |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame] | 595 | |
| 596 | #ifdef PNG_TEXT_SUPPORTED |
Glenn Randers-Pehrson | c36bb79 | 2011-02-12 09:49:07 -0600 | [diff] [blame] | 597 | /* 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] | 598 | * and whether that contents is compressed or not. The "key" field |
Glenn Randers-Pehrson | 4accabb | 2000-04-14 14:20:47 -0500 | [diff] [blame] | 599 | * points to a regular zero-terminated C string. The "text", "lang", and |
| 600 | * "lang_key" fields can be regular C strings, empty strings, or NULL pointers. |
Glenn Randers-Pehrson | 140504b | 2011-06-15 08:10:13 -0500 | [diff] [blame] | 601 | * However, the structure returned by png_get_text() will always contain |
Glenn Randers-Pehrson | c36bb79 | 2011-02-12 09:49:07 -0600 | [diff] [blame] | 602 | * regular zero-terminated C strings (possibly empty), never NULL pointers, |
Glenn Randers-Pehrson | 4accabb | 2000-04-14 14:20:47 -0500 | [diff] [blame] | 603 | * so they can be safely used in printf() and other string-handling functions. |
| 604 | */ |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 605 | typedef struct png_text_struct |
| 606 | { |
Glenn Randers-Pehrson | 4accabb | 2000-04-14 14:20:47 -0500 | [diff] [blame] | 607 | int compression; /* compression value: |
| 608 | -1: tEXt, none |
| 609 | 0: zTXt, deflate |
| 610 | 1: iTXt, none |
| 611 | 2: iTXt, deflate */ |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 612 | png_charp key; /* keyword, 1-79 character description of "text" */ |
Glenn Randers-Pehrson | 4accabb | 2000-04-14 14:20:47 -0500 | [diff] [blame] | 613 | png_charp text; /* comment, may be an empty string (ie "") |
| 614 | or a NULL pointer */ |
Glenn Randers-Pehrson | 61c32d9 | 2000-02-04 23:40:16 -0600 | [diff] [blame] | 615 | png_size_t text_length; /* length of the text string */ |
| 616 | png_size_t itxt_length; /* length of the itxt string */ |
Glenn Randers-Pehrson | 4accabb | 2000-04-14 14:20:47 -0500 | [diff] [blame] | 617 | png_charp lang; /* language code, 0-79 characters |
| 618 | or a NULL pointer */ |
Glenn Randers-Pehrson | 61c32d9 | 2000-02-04 23:40:16 -0600 | [diff] [blame] | 619 | 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] | 620 | chars or a NULL pointer */ |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 621 | } png_text; |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 622 | typedef png_text FAR * png_textp; |
Glenn Randers-Pehrson | e600c51 | 2010-08-18 07:25:46 -0500 | [diff] [blame] | 623 | typedef PNG_CONST png_text FAR * png_const_textp; |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 624 | typedef png_text FAR * FAR * png_textpp; |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame] | 625 | #endif |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 626 | |
| 627 | /* Supported compression types for text in PNG files (tEXt, and zTXt). |
| 628 | * The values of the PNG_TEXT_COMPRESSION_ defines should NOT be changed. */ |
| 629 | #define PNG_TEXT_COMPRESSION_NONE_WR -3 |
| 630 | #define PNG_TEXT_COMPRESSION_zTXt_WR -2 |
| 631 | #define PNG_TEXT_COMPRESSION_NONE -1 |
| 632 | #define PNG_TEXT_COMPRESSION_zTXt 0 |
Glenn Randers-Pehrson | 61c32d9 | 2000-02-04 23:40:16 -0600 | [diff] [blame] | 633 | #define PNG_ITXT_COMPRESSION_NONE 1 |
| 634 | #define PNG_ITXT_COMPRESSION_zTXt 2 |
| 635 | #define PNG_TEXT_COMPRESSION_LAST 3 /* Not a valid value */ |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 636 | |
| 637 | /* 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] | 638 | * Two conversions are provided, both from time_t and struct tm. There |
| 639 | * is no portable way to convert to either of these structures, as far |
| 640 | * 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] | 641 | * note - PNG has always been Year 2000 compliant! |
Glenn Randers-Pehrson | b6ce43d | 1998-01-01 07:13:13 -0600 | [diff] [blame] | 642 | */ |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 643 | typedef struct png_time_struct |
| 644 | { |
| 645 | png_uint_16 year; /* full year, as in, 1995 */ |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 646 | png_byte month; /* month of year, 1 - 12 */ |
| 647 | png_byte day; /* day of month, 1 - 31 */ |
| 648 | png_byte hour; /* hour of day, 0 - 23 */ |
| 649 | png_byte minute; /* minute of hour, 0 - 59 */ |
| 650 | png_byte second; /* second of minute, 0 - 60 (for leap seconds) */ |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 651 | } png_time; |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 652 | typedef png_time FAR * png_timep; |
Glenn Randers-Pehrson | e600c51 | 2010-08-18 07:25:46 -0500 | [diff] [blame] | 653 | typedef PNG_CONST png_time FAR * png_const_timep; |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 654 | typedef png_time FAR * FAR * png_timepp; |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 655 | |
Glenn Randers-Pehrson | 38674ec | 2009-06-16 13:33:01 -0500 | [diff] [blame] | 656 | #if defined(PNG_UNKNOWN_CHUNKS_SUPPORTED) || \ |
Glenn Randers-Pehrson | e8b1aa0 | 2010-03-06 11:39:29 -0600 | [diff] [blame] | 657 | defined(PNG_HANDLE_AS_UNKNOWN_SUPPORTED) |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame] | 658 | /* png_unknown_chunk is a structure to hold queued chunks for which there is |
| 659 | * no specific support. The idea is that we can use this to queue |
| 660 | * up private chunks for output even though the library doesn't actually |
| 661 | * know about their semantics. |
| 662 | */ |
| 663 | typedef struct png_unknown_chunk_t |
| 664 | { |
| 665 | png_byte name[5]; |
| 666 | png_byte *data; |
| 667 | png_size_t size; |
| 668 | |
Glenn Randers-Pehrson | 61c32d9 | 2000-02-04 23:40:16 -0600 | [diff] [blame] | 669 | /* libpng-using applications should NOT directly modify this byte. */ |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame] | 670 | png_byte location; /* mode of operation at read time */ |
| 671 | } |
Glenn Randers-Pehrson | 2d3fc1c | 2011-05-10 23:48:00 -0500 | [diff] [blame] | 672 | |
Glenn Randers-Pehrson | 2d3fc1c | 2011-05-10 23:48:00 -0500 | [diff] [blame] | 673 | |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame] | 674 | png_unknown_chunk; |
| 675 | typedef png_unknown_chunk FAR * png_unknown_chunkp; |
Glenn Randers-Pehrson | e600c51 | 2010-08-18 07:25:46 -0500 | [diff] [blame] | 676 | typedef PNG_CONST png_unknown_chunk FAR * png_const_unknown_chunkp; |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame] | 677 | typedef png_unknown_chunk FAR * FAR * png_unknown_chunkpp; |
| 678 | #endif |
| 679 | |
Glenn Randers-Pehrson | fd73d04 | 2011-06-13 13:25:21 -0500 | [diff] [blame] | 680 | /* Values for the unknown chunk location byte */ |
Glenn Randers-Pehrson | 2d3fc1c | 2011-05-10 23:48:00 -0500 | [diff] [blame] | 681 | |
Glenn Randers-Pehrson | fd73d04 | 2011-06-13 13:25:21 -0500 | [diff] [blame] | 682 | #define PNG_HAVE_IHDR 0x01 |
| 683 | #define PNG_HAVE_PLTE 0x02 |
| 684 | #define PNG_AFTER_IDAT 0x08 |
Glenn Randers-Pehrson | 2d3fc1c | 2011-05-10 23:48:00 -0500 | [diff] [blame] | 685 | |
Glenn Randers-Pehrson | 1384c04 | 2011-04-28 23:22:18 -0500 | [diff] [blame] | 686 | /* The complete definition of png_info has, as of libpng-1.5.0, |
| 687 | * been moved into a separate header file that is not accessible to |
| 688 | * applications. Read libpng-manual.txt or libpng.3 for more info. |
| 689 | */ |
Glenn Randers-Pehrson | f0cdbe7 | 2010-02-08 23:18:15 -0600 | [diff] [blame] | 690 | typedef struct png_info_def png_info; |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 691 | typedef png_info FAR * png_infop; |
John Bowler | 0a5c9c0 | 2011-01-22 17:36:34 -0600 | [diff] [blame] | 692 | typedef PNG_CONST png_info FAR * png_const_infop; |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 693 | typedef png_info FAR * FAR * png_infopp; |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 694 | |
Glenn Randers-Pehrson | 4393a9a | 1999-09-17 12:27:26 -0500 | [diff] [blame] | 695 | /* Maximum positive integer used in PNG is (2^31)-1 */ |
Glenn Randers-Pehrson | 5fea36f | 2004-07-28 08:20:44 -0500 | [diff] [blame] | 696 | #define PNG_UINT_31_MAX ((png_uint_32)0x7fffffffL) |
Glenn Randers-Pehrson | 7806777 | 2004-11-02 21:49:39 -0600 | [diff] [blame] | 697 | #define PNG_UINT_32_MAX ((png_uint_32)(-1)) |
| 698 | #define PNG_SIZE_MAX ((png_size_t)(-1)) |
Glenn Randers-Pehrson | 4393a9a | 1999-09-17 12:27:26 -0500 | [diff] [blame] | 699 | |
Glenn Randers-Pehrson | 31aee0d | 2010-07-29 17:39:14 -0500 | [diff] [blame] | 700 | /* These are constants for fixed point values encoded in the |
| 701 | * PNG specification manner (x100000) |
| 702 | */ |
| 703 | #define PNG_FP_1 100000 |
| 704 | #define PNG_FP_HALF 50000 |
John Bowler | d273ad2 | 2011-05-07 21:00:28 -0500 | [diff] [blame] | 705 | #define PNG_FP_MAX ((png_fixed_point)0x7fffffffL) |
| 706 | #define PNG_FP_MIN (-PNG_FP_MAX) |
Glenn Randers-Pehrson | 31aee0d | 2010-07-29 17:39:14 -0500 | [diff] [blame] | 707 | |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 708 | /* These describe the color_type field in png_info. */ |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 709 | /* color type masks */ |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 710 | #define PNG_COLOR_MASK_PALETTE 1 |
| 711 | #define PNG_COLOR_MASK_COLOR 2 |
| 712 | #define PNG_COLOR_MASK_ALPHA 4 |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 713 | |
| 714 | /* color types. Note that not all combinations are legal */ |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 715 | #define PNG_COLOR_TYPE_GRAY 0 |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 716 | #define PNG_COLOR_TYPE_PALETTE (PNG_COLOR_MASK_COLOR | PNG_COLOR_MASK_PALETTE) |
| 717 | #define PNG_COLOR_TYPE_RGB (PNG_COLOR_MASK_COLOR) |
| 718 | #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] | 719 | #define PNG_COLOR_TYPE_GRAY_ALPHA (PNG_COLOR_MASK_ALPHA) |
Glenn Randers-Pehrson | 5e5c1e1 | 2000-11-10 12:26:19 -0600 | [diff] [blame] | 720 | /* aliases */ |
| 721 | #define PNG_COLOR_TYPE_RGBA PNG_COLOR_TYPE_RGB_ALPHA |
| 722 | #define PNG_COLOR_TYPE_GA PNG_COLOR_TYPE_GRAY_ALPHA |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 723 | |
Glenn Randers-Pehrson | 4393a9a | 1999-09-17 12:27:26 -0500 | [diff] [blame] | 724 | /* 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] | 725 | #define PNG_COMPRESSION_TYPE_BASE 0 /* Deflate method 8, 32K window */ |
| 726 | #define PNG_COMPRESSION_TYPE_DEFAULT PNG_COMPRESSION_TYPE_BASE |
| 727 | |
Glenn Randers-Pehrson | 4393a9a | 1999-09-17 12:27:26 -0500 | [diff] [blame] | 728 | /* 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] | 729 | #define PNG_FILTER_TYPE_BASE 0 /* Single row per-byte filtering */ |
Glenn Randers-Pehrson | 2ad31ae | 2000-12-15 08:54:42 -0600 | [diff] [blame] | 730 | #define PNG_INTRAPIXEL_DIFFERENCING 64 /* Used only in MNG datastreams */ |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 731 | #define PNG_FILTER_TYPE_DEFAULT PNG_FILTER_TYPE_BASE |
| 732 | |
| 733 | /* These are for the interlacing type. These values should NOT be changed. */ |
| 734 | #define PNG_INTERLACE_NONE 0 /* Non-interlaced image */ |
| 735 | #define PNG_INTERLACE_ADAM7 1 /* Adam7 interlacing */ |
| 736 | #define PNG_INTERLACE_LAST 2 /* Not a valid value */ |
| 737 | |
| 738 | /* These are for the oFFs chunk. These values should NOT be changed. */ |
| 739 | #define PNG_OFFSET_PIXEL 0 /* Offset in pixels */ |
| 740 | #define PNG_OFFSET_MICROMETER 1 /* Offset in micrometers (1/10^6 meter) */ |
| 741 | #define PNG_OFFSET_LAST 2 /* Not a valid value */ |
| 742 | |
| 743 | /* These are for the pCAL chunk. These values should NOT be changed. */ |
| 744 | #define PNG_EQUATION_LINEAR 0 /* Linear transformation */ |
| 745 | #define PNG_EQUATION_BASE_E 1 /* Exponential base e transform */ |
| 746 | #define PNG_EQUATION_ARBITRARY 2 /* Arbitrary base exponential transform */ |
| 747 | #define PNG_EQUATION_HYPERBOLIC 3 /* Hyperbolic sine transformation */ |
| 748 | #define PNG_EQUATION_LAST 4 /* Not a valid value */ |
| 749 | |
Glenn Randers-Pehrson | 61c32d9 | 2000-02-04 23:40:16 -0600 | [diff] [blame] | 750 | /* These are for the sCAL chunk. These values should NOT be changed. */ |
| 751 | #define PNG_SCALE_UNKNOWN 0 /* unknown unit (image scale) */ |
| 752 | #define PNG_SCALE_METER 1 /* meters per pixel */ |
| 753 | #define PNG_SCALE_RADIAN 2 /* radians per pixel */ |
| 754 | #define PNG_SCALE_LAST 3 /* Not a valid value */ |
| 755 | |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 756 | /* These are for the pHYs chunk. These values should NOT be changed. */ |
| 757 | #define PNG_RESOLUTION_UNKNOWN 0 /* pixels/unknown unit (aspect ratio) */ |
| 758 | #define PNG_RESOLUTION_METER 1 /* pixels/meter */ |
| 759 | #define PNG_RESOLUTION_LAST 2 /* Not a valid value */ |
| 760 | |
Glenn Randers-Pehrson | 46f61e2 | 1998-01-30 21:45:12 -0600 | [diff] [blame] | 761 | /* 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] | 762 | #define PNG_sRGB_INTENT_PERCEPTUAL 0 |
| 763 | #define PNG_sRGB_INTENT_RELATIVE 1 |
| 764 | #define PNG_sRGB_INTENT_SATURATION 2 |
| 765 | #define PNG_sRGB_INTENT_ABSOLUTE 3 |
Glenn Randers-Pehrson | 46f61e2 | 1998-01-30 21:45:12 -0600 | [diff] [blame] | 766 | #define PNG_sRGB_INTENT_LAST 4 /* Not a valid value */ |
Glenn Randers-Pehrson | 5c6aeb2 | 1998-12-29 11:47:59 -0600 | [diff] [blame] | 767 | |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame] | 768 | /* This is for text chunks */ |
| 769 | #define PNG_KEYWORD_MAX_LENGTH 79 |
Glenn Randers-Pehrson | 46f61e2 | 1998-01-30 21:45:12 -0600 | [diff] [blame] | 770 | |
Glenn Randers-Pehrson | 76e5fd6 | 2000-12-28 07:50:05 -0600 | [diff] [blame] | 771 | /* Maximum number of entries in PLTE/sPLT/tRNS arrays */ |
Glenn Randers-Pehrson | d1e8c86 | 2002-06-20 06:54:34 -0500 | [diff] [blame] | 772 | #define PNG_MAX_PALETTE_LENGTH 256 |
Glenn Randers-Pehrson | 46f61e2 | 1998-01-30 21:45:12 -0600 | [diff] [blame] | 773 | |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 774 | /* These determine if an ancillary chunk's data has been successfully read |
| 775 | * from the PNG header, or if the application has filled in the corresponding |
| 776 | * data in the info_struct to be written into the output file. The values |
| 777 | * of the PNG_INFO_<chunk> defines should NOT be changed. |
| 778 | */ |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 779 | #define PNG_INFO_gAMA 0x0001 |
| 780 | #define PNG_INFO_sBIT 0x0002 |
| 781 | #define PNG_INFO_cHRM 0x0004 |
| 782 | #define PNG_INFO_PLTE 0x0008 |
| 783 | #define PNG_INFO_tRNS 0x0010 |
| 784 | #define PNG_INFO_bKGD 0x0020 |
| 785 | #define PNG_INFO_hIST 0x0040 |
| 786 | #define PNG_INFO_pHYs 0x0080 |
| 787 | #define PNG_INFO_oFFs 0x0100 |
| 788 | #define PNG_INFO_tIME 0x0200 |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 789 | #define PNG_INFO_pCAL 0x0400 |
Glenn Randers-Pehrson | b6ce43d | 1998-01-01 07:13:13 -0600 | [diff] [blame] | 790 | #define PNG_INFO_sRGB 0x0800 /* GR-P, 0.96a */ |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame] | 791 | #define PNG_INFO_iCCP 0x1000 /* ESR, 1.0.6 */ |
| 792 | #define PNG_INFO_sPLT 0x2000 /* ESR, 1.0.6 */ |
| 793 | #define PNG_INFO_sCAL 0x4000 /* ESR, 1.0.6 */ |
Glenn Randers-Pehrson | a77ef62 | 2000-02-18 13:48:52 -0600 | [diff] [blame] | 794 | #define PNG_INFO_IDAT 0x8000L /* ESR, 1.0.6 */ |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 795 | |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 796 | /* This is used for the transformation routines, as some of them |
| 797 | * change these values for the row. It also should enable using |
| 798 | * the routines for other purposes. |
| 799 | */ |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 800 | typedef struct png_row_info_struct |
| 801 | { |
Glenn Randers-Pehrson | 9f044c1 | 2010-12-07 14:59:43 -0600 | [diff] [blame] | 802 | png_uint_32 width; /* width of row */ |
| 803 | png_size_t rowbytes; /* number of bytes in row */ |
| 804 | png_byte color_type; /* color type of row */ |
| 805 | png_byte bit_depth; /* bit depth of row */ |
| 806 | png_byte channels; /* number of channels (1, 2, 3, or 4) */ |
Guy Schalnat | 4ee97b0 | 1996-01-16 01:51:56 -0600 | [diff] [blame] | 807 | png_byte pixel_depth; /* bits per pixel (depth * channels) */ |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 808 | } png_row_info; |
| 809 | |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 810 | typedef png_row_info FAR * png_row_infop; |
| 811 | typedef png_row_info FAR * FAR * png_row_infopp; |
Guy Schalnat | 0f71645 | 1995-11-28 11:22:13 -0600 | [diff] [blame] | 812 | |
Glenn Randers-Pehrson | 1384c04 | 2011-04-28 23:22:18 -0500 | [diff] [blame] | 813 | /* The complete definition of png_struct has, as of libpng-1.5.0, |
| 814 | * been moved into a separate header file that is not accessible to |
| 815 | * applications. Read libpng-manual.txt or libpng.3 for more info. |
| 816 | */ |
| 817 | typedef struct png_struct_def png_struct; |
| 818 | typedef PNG_CONST png_struct FAR * png_const_structp; |
| 819 | typedef png_struct FAR * png_structp; |
| 820 | |
Glenn Randers-Pehrson | 8686fff | 1998-05-21 09:27:50 -0500 | [diff] [blame] | 821 | /* These are the function types for the I/O functions and for the functions |
| 822 | * that allow the user to override the default I/O functions with his or her |
| 823 | * own. The png_error_ptr type should match that of user-supplied warning |
| 824 | * 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] | 825 | * 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] | 826 | * 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] | 827 | * expected to return the read data in the buffer. |
Guy Schalnat | 0f71645 | 1995-11-28 11:22:13 -0600 | [diff] [blame] | 828 | */ |
John Bowler | 9c69360 | 2011-02-12 08:58:21 -0600 | [diff] [blame] | 829 | typedef PNG_CALLBACK(void, *png_error_ptr, (png_structp, png_const_charp)); |
| 830 | typedef PNG_CALLBACK(void, *png_rw_ptr, (png_structp, png_bytep, png_size_t)); |
| 831 | typedef PNG_CALLBACK(void, *png_flush_ptr, (png_structp)); |
| 832 | typedef PNG_CALLBACK(void, *png_read_status_ptr, (png_structp, png_uint_32, |
| 833 | int)); |
| 834 | typedef PNG_CALLBACK(void, *png_write_status_ptr, (png_structp, png_uint_32, |
| 835 | int)); |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame] | 836 | |
Guy Schalnat | 69b1448 | 1996-01-10 02:56:49 -0600 | [diff] [blame] | 837 | #ifdef PNG_PROGRESSIVE_READ_SUPPORTED |
John Bowler | 9c69360 | 2011-02-12 08:58:21 -0600 | [diff] [blame] | 838 | typedef PNG_CALLBACK(void, *png_progressive_info_ptr, (png_structp, png_infop)); |
| 839 | typedef PNG_CALLBACK(void, *png_progressive_end_ptr, (png_structp, png_infop)); |
John Bowler | 9616ad9 | 2011-02-16 06:13:46 -0600 | [diff] [blame] | 840 | |
| 841 | /* The following callback receives png_uint_32 row_number, int pass for the |
| 842 | * png_bytep data of the row. When transforming an interlaced image the |
| 843 | * row number is the row number within the sub-image of the interlace pass, so |
| 844 | * the value will increase to the height of the sub-image (not the full image) |
| 845 | * then reset to 0 for the next pass. |
| 846 | * |
| 847 | * Use PNG_ROW_FROM_PASS_ROW(row, pass) and PNG_COL_FROM_PASS_COL(col, pass) to |
| 848 | * find the output pixel (x,y) given an interlaced sub-image pixel |
| 849 | * (row,col,pass). (See below for these macros.) |
| 850 | */ |
John Bowler | 9c69360 | 2011-02-12 08:58:21 -0600 | [diff] [blame] | 851 | 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] | 852 | png_uint_32, int)); |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame] | 853 | #endif |
Guy Schalnat | 6d76471 | 1995-12-19 03:22:19 -0600 | [diff] [blame] | 854 | |
Glenn Randers-Pehrson | 08a3343 | 1998-03-07 06:06:55 -0600 | [diff] [blame] | 855 | #if defined(PNG_READ_USER_TRANSFORM_SUPPORTED) || \ |
Glenn Randers-Pehrson | 33188ac | 2009-06-16 14:12:35 -0500 | [diff] [blame] | 856 | defined(PNG_WRITE_USER_TRANSFORM_SUPPORTED) |
John Bowler | 9c69360 | 2011-02-12 08:58:21 -0600 | [diff] [blame] | 857 | 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] | 858 | png_bytep)); |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame] | 859 | #endif |
Glenn Randers-Pehrson | 08a3343 | 1998-03-07 06:06:55 -0600 | [diff] [blame] | 860 | |
Glenn Randers-Pehrson | 4e6b5e9 | 2009-09-23 10:24:53 -0500 | [diff] [blame] | 861 | #ifdef PNG_USER_CHUNKS_SUPPORTED |
John Bowler | 9c69360 | 2011-02-12 08:58:21 -0600 | [diff] [blame] | 862 | typedef PNG_CALLBACK(int, *png_user_chunk_ptr, (png_structp, |
Glenn Randers-Pehrson | c36bb79 | 2011-02-12 09:49:07 -0600 | [diff] [blame] | 863 | png_unknown_chunkp)); |
Glenn Randers-Pehrson | 61c32d9 | 2000-02-04 23:40:16 -0600 | [diff] [blame] | 864 | #endif |
Glenn Randers-Pehrson | 4e6b5e9 | 2009-09-23 10:24:53 -0500 | [diff] [blame] | 865 | #ifdef PNG_UNKNOWN_CHUNKS_SUPPORTED |
John Bowler | 9c69360 | 2011-02-12 08:58:21 -0600 | [diff] [blame] | 866 | typedef PNG_CALLBACK(void, *png_unknown_chunk_ptr, (png_structp)); |
Glenn Randers-Pehrson | 61c32d9 | 2000-02-04 23:40:16 -0600 | [diff] [blame] | 867 | #endif |
Glenn Randers-Pehrson | 9f044c1 | 2010-12-07 14:59:43 -0600 | [diff] [blame] | 868 | |
Glenn Randers-Pehrson | f4ea224 | 2009-11-20 21:38:24 -0600 | [diff] [blame] | 869 | #ifdef PNG_SETJMP_SUPPORTED |
John Bowler | b302c47 | 2011-04-15 06:37:34 -0500 | [diff] [blame] | 870 | /* This must match the function definition in <setjmp.h>, and the application |
| 871 | * must include this before png.h to obtain the definition of jmp_buf. The |
| 872 | * function is required to be PNG_NORETURN, but this is not checked. If the |
| 873 | * function does return the application will crash via an abort() or similar |
| 874 | * system level call. |
Glenn Randers-Pehrson | 31aee0d | 2010-07-29 17:39:14 -0500 | [diff] [blame] | 875 | * |
John Bowler | b302c47 | 2011-04-15 06:37:34 -0500 | [diff] [blame] | 876 | * 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] | 877 | * changes to ensure that pnglibconf.h records the calling convention used by |
| 878 | * your compiler. This may be very difficult - try using a different compiler |
| 879 | * to build the library! |
Glenn Randers-Pehrson | f4ea224 | 2009-11-20 21:38:24 -0600 | [diff] [blame] | 880 | */ |
John Bowler | b302c47 | 2011-04-15 06:37:34 -0500 | [diff] [blame] | 881 | 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] | 882 | #endif |
Glenn Randers-Pehrson | 61c32d9 | 2000-02-04 23:40:16 -0600 | [diff] [blame] | 883 | |
| 884 | /* Transform masks for the high-level interface */ |
Glenn Randers-Pehrson | a77ef62 | 2000-02-18 13:48:52 -0600 | [diff] [blame] | 885 | #define PNG_TRANSFORM_IDENTITY 0x0000 /* read and write */ |
| 886 | #define PNG_TRANSFORM_STRIP_16 0x0001 /* read only */ |
Glenn Randers-Pehrson | 61c32d9 | 2000-02-04 23:40:16 -0600 | [diff] [blame] | 887 | #define PNG_TRANSFORM_STRIP_ALPHA 0x0002 /* read only */ |
| 888 | #define PNG_TRANSFORM_PACKING 0x0004 /* read and write */ |
Glenn Randers-Pehrson | a77ef62 | 2000-02-18 13:48:52 -0600 | [diff] [blame] | 889 | #define PNG_TRANSFORM_PACKSWAP 0x0008 /* read and write */ |
| 890 | #define PNG_TRANSFORM_EXPAND 0x0010 /* read only */ |
Glenn Randers-Pehrson | 61c32d9 | 2000-02-04 23:40:16 -0600 | [diff] [blame] | 891 | #define PNG_TRANSFORM_INVERT_MONO 0x0020 /* read and write */ |
Glenn Randers-Pehrson | a77ef62 | 2000-02-18 13:48:52 -0600 | [diff] [blame] | 892 | #define PNG_TRANSFORM_SHIFT 0x0040 /* read and write */ |
| 893 | #define PNG_TRANSFORM_BGR 0x0080 /* read and write */ |
| 894 | #define PNG_TRANSFORM_SWAP_ALPHA 0x0100 /* read and write */ |
Glenn Randers-Pehrson | 61c32d9 | 2000-02-04 23:40:16 -0600 | [diff] [blame] | 895 | #define PNG_TRANSFORM_SWAP_ENDIAN 0x0200 /* read and write */ |
Glenn Randers-Pehrson | db66d44 | 2000-06-23 21:38:16 -0500 | [diff] [blame] | 896 | #define PNG_TRANSFORM_INVERT_ALPHA 0x0400 /* read and write */ |
Glenn Randers-Pehrson | 99708d5 | 2009-06-29 17:30:00 -0500 | [diff] [blame] | 897 | #define PNG_TRANSFORM_STRIP_FILLER 0x0800 /* write only */ |
Glenn Randers-Pehrson | 1eb14e9 | 2008-12-10 07:14:45 -0600 | [diff] [blame] | 898 | /* Added to libpng-1.2.34 */ |
Glenn Randers-Pehrson | 0ffb71a | 2009-02-28 06:08:20 -0600 | [diff] [blame] | 899 | #define PNG_TRANSFORM_STRIP_FILLER_BEFORE PNG_TRANSFORM_STRIP_FILLER |
Glenn Randers-Pehrson | 99708d5 | 2009-06-29 17:30:00 -0500 | [diff] [blame] | 900 | #define PNG_TRANSFORM_STRIP_FILLER_AFTER 0x1000 /* write only */ |
| 901 | /* Added to libpng-1.4.0 */ |
| 902 | #define PNG_TRANSFORM_GRAY_TO_RGB 0x2000 /* read only */ |
Glenn Randers-Pehrson | ef217b7 | 2011-06-15 12:58:27 -0500 | [diff] [blame] | 903 | /* Added to libpng-1.5.4 */ |
John Bowler | a9b3419 | 2011-05-08 19:46:51 -0500 | [diff] [blame] | 904 | #define PNG_TRANSFORM_EXPAND_16 0x4000 /* read only */ |
Glenn Randers-Pehrson | ab63dd0 | 2011-06-17 20:04:17 -0500 | [diff] [blame^] | 905 | #define PNG_TRANSFORM_SCALE_16 0x8000 /* read only */ |
Glenn Randers-Pehrson | 61c32d9 | 2000-02-04 23:40:16 -0600 | [diff] [blame] | 906 | |
Glenn Randers-Pehrson | 5e5c1e1 | 2000-11-10 12:26:19 -0600 | [diff] [blame] | 907 | /* Flags for MNG supported features */ |
Glenn Randers-Pehrson | d56aca7 | 2000-11-23 11:51:42 -0600 | [diff] [blame] | 908 | #define PNG_FLAG_MNG_EMPTY_PLTE 0x01 |
Glenn Randers-Pehrson | d56aca7 | 2000-11-23 11:51:42 -0600 | [diff] [blame] | 909 | #define PNG_FLAG_MNG_FILTER_64 0x04 |
Glenn Randers-Pehrson | 408b421 | 2000-12-18 09:33:57 -0600 | [diff] [blame] | 910 | #define PNG_ALL_MNG_FEATURES 0x05 |
Glenn Randers-Pehrson | 5e5c1e1 | 2000-11-10 12:26:19 -0600 | [diff] [blame] | 911 | |
Glenn Randers-Pehrson | c36bb79 | 2011-02-12 09:49:07 -0600 | [diff] [blame] | 912 | /* 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] | 913 | * this allowed the zlib default functions to be used on Windows |
| 914 | * platforms. In 1.5 the zlib default malloc (which just calls malloc and |
| 915 | * ignores the first argument) should be completely compatible with the |
| 916 | * following. |
| 917 | */ |
Glenn Randers-Pehrson | c36bb79 | 2011-02-12 09:49:07 -0600 | [diff] [blame] | 918 | typedef PNG_CALLBACK(png_voidp, *png_malloc_ptr, (png_structp, |
John Bowler | 9c69360 | 2011-02-12 08:58:21 -0600 | [diff] [blame] | 919 | png_alloc_size_t)); |
| 920 | typedef PNG_CALLBACK(void, *png_free_ptr, (png_structp, png_voidp)); |
Glenn Randers-Pehrson | f7d1a17 | 1998-06-06 15:31:35 -0500 | [diff] [blame] | 921 | |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 922 | typedef png_struct FAR * FAR * png_structpp; |
Guy Schalnat | 6d76471 | 1995-12-19 03:22:19 -0600 | [diff] [blame] | 923 | |
Glenn Randers-Pehrson | 862cb20 | 2010-04-16 22:12:51 -0500 | [diff] [blame] | 924 | /* Section 3: exported functions |
| 925 | * Here are the function definitions most commonly used. This is not |
Glenn Randers-Pehrson | f3abb2c | 2010-10-17 12:51:53 -0500 | [diff] [blame] | 926 | * 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] | 927 | * full explanation, see example.c for the summary. This just provides |
Glenn Randers-Pehrson | 61c32d9 | 2000-02-04 23:40:16 -0600 | [diff] [blame] | 928 | * a simple one line description of the use of each function. |
Glenn Randers-Pehrson | a451725 | 2010-12-06 08:54:55 -0600 | [diff] [blame] | 929 | * |
Glenn Randers-Pehrson | 23d3970 | 2010-12-06 18:28:02 -0600 | [diff] [blame] | 930 | * The PNG_EXPORT() and PNG_EXPORTA() macros used below are defined in |
| 931 | * pngconf.h and in the *.dfn files in the scripts directory. |
Glenn Randers-Pehrson | a451725 | 2010-12-06 08:54:55 -0600 | [diff] [blame] | 932 | * |
Glenn Randers-Pehrson | 23d3970 | 2010-12-06 18:28:02 -0600 | [diff] [blame] | 933 | * PNG_EXPORT(ordinal, type, name, (args)); |
Glenn Randers-Pehrson | 27df3a4 | 2010-12-06 12:38:42 -0600 | [diff] [blame] | 934 | * |
| 935 | * ordinal: ordinal that is used while building |
| 936 | * *.def files. The ordinal value is only |
| 937 | * relevant when preprocessing png.h with |
| 938 | * the *.dfn files for building symbol table |
Glenn Randers-Pehrson | 23d3970 | 2010-12-06 18:28:02 -0600 | [diff] [blame] | 939 | * entries, and are removed by pngconf.h. |
Glenn Randers-Pehrson | 27df3a4 | 2010-12-06 12:38:42 -0600 | [diff] [blame] | 940 | * type: return type of the function |
| 941 | * name: function name |
| 942 | * args: function arguments, with types |
| 943 | * |
Glenn Randers-Pehrson | 23d3970 | 2010-12-06 18:28:02 -0600 | [diff] [blame] | 944 | * When we wish to append attributes to a function prototype we use |
| 945 | * the PNG_EXPORTA() macro instead. |
| 946 | * |
Glenn Randers-Pehrson | 27df3a4 | 2010-12-06 12:38:42 -0600 | [diff] [blame] | 947 | * PNG_EXPORTA(ordinal, type, name, (args), attributes); |
| 948 | * |
Glenn Randers-Pehrson | 23d3970 | 2010-12-06 18:28:02 -0600 | [diff] [blame] | 949 | * ordinal, type, name, and args: same as in PNG_EXPORT(). |
Glenn Randers-Pehrson | 27df3a4 | 2010-12-06 12:38:42 -0600 | [diff] [blame] | 950 | * attributes: function attributes |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 951 | */ |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 952 | |
Glenn Randers-Pehrson | 1ef65b6 | 2000-05-12 06:19:53 -0500 | [diff] [blame] | 953 | /* Returns the version number of the library */ |
Glenn Randers-Pehrson | 23d3970 | 2010-12-06 18:28:02 -0600 | [diff] [blame] | 954 | PNG_EXPORT(1, png_uint_32, png_access_version_number, (void)); |
Glenn Randers-Pehrson | 1ef65b6 | 2000-05-12 06:19:53 -0500 | [diff] [blame] | 955 | |
Andreas Dilger | 02ad0ef | 1997-01-17 01:34:35 -0600 | [diff] [blame] | 956 | /* Tell lib we have already handled the first <num_bytes> magic bytes. |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 957 | * Handling more than 8 bytes from the beginning of the file is an error. |
| 958 | */ |
Glenn Randers-Pehrson | 23d3970 | 2010-12-06 18:28:02 -0600 | [diff] [blame] | 959 | PNG_EXPORT(2, void, png_set_sig_bytes, (png_structp png_ptr, int num_bytes)); |
Andreas Dilger | 02ad0ef | 1997-01-17 01:34:35 -0600 | [diff] [blame] | 960 | |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 961 | /* Check sig[start] through sig[start + num_to_check - 1] to see if it's a |
| 962 | * PNG file. Returns zero if the supplied bytes match the 8-byte PNG |
| 963 | * signature, and non-zero otherwise. Having num_to_check == 0 or |
| 964 | * start > 7 will always fail (ie return non-zero). |
| 965 | */ |
Glenn Randers-Pehrson | c36bb79 | 2011-02-12 09:49:07 -0600 | [diff] [blame] | 966 | 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] | 967 | png_size_t num_to_check)); |
Andreas Dilger | 02ad0ef | 1997-01-17 01:34:35 -0600 | [diff] [blame] | 968 | |
Glenn Randers-Pehrson | 3e42a99 | 2010-03-31 22:16:07 -0500 | [diff] [blame] | 969 | /* Simple signature checking function. This is the same as calling |
| 970 | * png_check_sig(sig, n) := !png_sig_cmp(sig, 0, n). |
| 971 | */ |
Glenn Randers-Pehrson | 23d3970 | 2010-12-06 18:28:02 -0600 | [diff] [blame] | 972 | #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] | 973 | |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 974 | /* 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] | 975 | PNG_EXPORTA(4, png_structp, png_create_read_struct, |
| 976 | (png_const_charp user_png_ver, png_voidp error_ptr, |
Glenn Randers-Pehrson | c36bb79 | 2011-02-12 09:49:07 -0600 | [diff] [blame] | 977 | png_error_ptr error_fn, png_error_ptr warn_fn), |
Glenn Randers-Pehrson | 27df3a4 | 2010-12-06 12:38:42 -0600 | [diff] [blame] | 978 | PNG_ALLOCATED); |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 979 | |
Glenn Randers-Pehrson | f7d1a17 | 1998-06-06 15:31:35 -0500 | [diff] [blame] | 980 | /* 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] | 981 | PNG_EXPORTA(5, png_structp, png_create_write_struct, |
| 982 | (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] | 983 | png_error_ptr warn_fn), |
Glenn Randers-Pehrson | 27df3a4 | 2010-12-06 12:38:42 -0600 | [diff] [blame] | 984 | PNG_ALLOCATED); |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 985 | |
Glenn Randers-Pehrson | 23d3970 | 2010-12-06 18:28:02 -0600 | [diff] [blame] | 986 | PNG_EXPORT(6, png_size_t, png_get_compression_buffer_size, |
John Bowler | 0a5c9c0 | 2011-01-22 17:36:34 -0600 | [diff] [blame] | 987 | (png_const_structp png_ptr)); |
Glenn Randers-Pehrson | 228bd39 | 2000-04-23 23:14:02 -0500 | [diff] [blame] | 988 | |
Glenn Randers-Pehrson | c36bb79 | 2011-02-12 09:49:07 -0600 | [diff] [blame] | 989 | PNG_EXPORT(7, void, png_set_compression_buffer_size, (png_structp png_ptr, |
Glenn Randers-Pehrson | 27df3a4 | 2010-12-06 12:38:42 -0600 | [diff] [blame] | 990 | png_size_t size)); |
Glenn Randers-Pehrson | 228bd39 | 2000-04-23 23:14:02 -0500 | [diff] [blame] | 991 | |
Glenn Randers-Pehrson | f4ea224 | 2009-11-20 21:38:24 -0600 | [diff] [blame] | 992 | /* Moved from pngconf.h in 1.4.0 and modified to ensure setjmp/longjmp |
| 993 | * match up. |
| 994 | */ |
| 995 | #ifdef PNG_SETJMP_SUPPORTED |
| 996 | /* This function returns the jmp_buf built in to *png_ptr. It must be |
| 997 | * supplied with an appropriate 'longjmp' function to use on that jmp_buf |
| 998 | * unless the default error function is overridden in which case NULL is |
| 999 | * acceptable. The size of the jmp_buf is checked against the actual size |
| 1000 | * allocated by the library - the call will return NULL on a mismatch |
| 1001 | * indicating an ABI mismatch. |
| 1002 | */ |
Glenn Randers-Pehrson | c36bb79 | 2011-02-12 09:49:07 -0600 | [diff] [blame] | 1003 | PNG_EXPORT(8, jmp_buf*, png_set_longjmp_fn, (png_structp png_ptr, |
Glenn Randers-Pehrson | 27df3a4 | 2010-12-06 12:38:42 -0600 | [diff] [blame] | 1004 | png_longjmp_ptr longjmp_fn, size_t jmp_buf_size)); |
Glenn Randers-Pehrson | f4ea224 | 2009-11-20 21:38:24 -0600 | [diff] [blame] | 1005 | # define png_jmpbuf(png_ptr) \ |
Glenn Randers-Pehrson | e8b1aa0 | 2010-03-06 11:39:29 -0600 | [diff] [blame] | 1006 | (*png_set_longjmp_fn((png_ptr), longjmp, sizeof (jmp_buf))) |
Glenn Randers-Pehrson | f4ea224 | 2009-11-20 21:38:24 -0600 | [diff] [blame] | 1007 | #else |
| 1008 | # define png_jmpbuf(png_ptr) \ |
Glenn Randers-Pehrson | e8b1aa0 | 2010-03-06 11:39:29 -0600 | [diff] [blame] | 1009 | (LIBPNG_WAS_COMPILED_WITH__PNG_NO_SETJMP) |
Glenn Randers-Pehrson | f4ea224 | 2009-11-20 21:38:24 -0600 | [diff] [blame] | 1010 | #endif |
Glenn Randers-Pehrson | f98726a | 2010-02-19 09:54:53 -0600 | [diff] [blame] | 1011 | /* This function should be used by libpng applications in place of |
| 1012 | * longjmp(png_ptr->jmpbuf, val). If longjmp_fn() has been set, it |
| 1013 | * will use it; otherwise it will call PNG_ABORT(). This function was |
| 1014 | * added in libpng-1.5.0. |
| 1015 | */ |
Glenn Randers-Pehrson | 23d3970 | 2010-12-06 18:28:02 -0600 | [diff] [blame] | 1016 | PNG_EXPORTA(9, void, png_longjmp, (png_structp png_ptr, int val), |
| 1017 | PNG_NORETURN); |
Glenn Randers-Pehrson | f4ea224 | 2009-11-20 21:38:24 -0600 | [diff] [blame] | 1018 | |
Glenn Randers-Pehrson | 2b8bef1 | 2010-04-29 11:50:24 -0500 | [diff] [blame] | 1019 | #ifdef PNG_READ_SUPPORTED |
Glenn Randers-Pehrson | 228bd39 | 2000-04-23 23:14:02 -0500 | [diff] [blame] | 1020 | /* Reset the compression stream */ |
Glenn Randers-Pehrson | 23d3970 | 2010-12-06 18:28:02 -0600 | [diff] [blame] | 1021 | PNG_EXPORT(10, int, png_reset_zstream, (png_structp png_ptr)); |
Glenn Randers-Pehrson | 2b8bef1 | 2010-04-29 11:50:24 -0500 | [diff] [blame] | 1022 | #endif |
Glenn Randers-Pehrson | 228bd39 | 2000-04-23 23:14:02 -0500 | [diff] [blame] | 1023 | |
Glenn Randers-Pehrson | 8b6a889 | 2001-05-18 04:54:50 -0500 | [diff] [blame] | 1024 | /* 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] | 1025 | #ifdef PNG_USER_MEM_SUPPORTED |
Glenn Randers-Pehrson | 23d3970 | 2010-12-06 18:28:02 -0600 | [diff] [blame] | 1026 | PNG_EXPORTA(11, png_structp, png_create_read_struct_2, |
| 1027 | (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] | 1028 | png_error_ptr warn_fn, |
| 1029 | 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] | 1030 | PNG_ALLOCATED); |
| 1031 | PNG_EXPORTA(12, png_structp, png_create_write_struct_2, |
| 1032 | (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] | 1033 | png_error_ptr warn_fn, |
| 1034 | 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] | 1035 | PNG_ALLOCATED); |
Glenn Randers-Pehrson | f7d1a17 | 1998-06-06 15:31:35 -0500 | [diff] [blame] | 1036 | #endif |
| 1037 | |
Glenn Randers-Pehrson | 6bc53be | 2006-06-16 07:52:03 -0500 | [diff] [blame] | 1038 | /* Write the PNG file signature. */ |
Glenn Randers-Pehrson | 23d3970 | 2010-12-06 18:28:02 -0600 | [diff] [blame] | 1039 | PNG_EXPORT(13, void, png_write_sig, (png_structp png_ptr)); |
Glenn Randers-Pehrson | 6bc53be | 2006-06-16 07:52:03 -0500 | [diff] [blame] | 1040 | |
Glenn Randers-Pehrson | cbe52d8 | 1998-02-28 07:00:24 -0600 | [diff] [blame] | 1041 | /* Write a PNG chunk - size, type, (optional) data, CRC. */ |
Glenn Randers-Pehrson | 23d3970 | 2010-12-06 18:28:02 -0600 | [diff] [blame] | 1042 | PNG_EXPORT(14, void, png_write_chunk, (png_structp png_ptr, png_const_bytep |
| 1043 | chunk_name, png_const_bytep data, png_size_t length)); |
Glenn Randers-Pehrson | cbe52d8 | 1998-02-28 07:00:24 -0600 | [diff] [blame] | 1044 | |
| 1045 | /* Write the start of a PNG chunk - length and chunk name. */ |
Glenn Randers-Pehrson | c36bb79 | 2011-02-12 09:49:07 -0600 | [diff] [blame] | 1046 | PNG_EXPORT(15, void, png_write_chunk_start, (png_structp png_ptr, |
Glenn Randers-Pehrson | 23d3970 | 2010-12-06 18:28:02 -0600 | [diff] [blame] | 1047 | png_const_bytep chunk_name, png_uint_32 length)); |
Glenn Randers-Pehrson | cbe52d8 | 1998-02-28 07:00:24 -0600 | [diff] [blame] | 1048 | |
| 1049 | /* Write the data of a PNG chunk started with png_write_chunk_start(). */ |
Glenn Randers-Pehrson | 23d3970 | 2010-12-06 18:28:02 -0600 | [diff] [blame] | 1050 | PNG_EXPORT(16, void, png_write_chunk_data, (png_structp png_ptr, |
| 1051 | png_const_bytep data, png_size_t length)); |
Glenn Randers-Pehrson | cbe52d8 | 1998-02-28 07:00:24 -0600 | [diff] [blame] | 1052 | |
| 1053 | /* Finish a chunk started with png_write_chunk_start() (includes CRC). */ |
Glenn Randers-Pehrson | 23d3970 | 2010-12-06 18:28:02 -0600 | [diff] [blame] | 1054 | PNG_EXPORT(17, void, png_write_chunk_end, (png_structp png_ptr)); |
Glenn Randers-Pehrson | cbe52d8 | 1998-02-28 07:00:24 -0600 | [diff] [blame] | 1055 | |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 1056 | /* Allocate and initialize the info structure */ |
Glenn Randers-Pehrson | c36bb79 | 2011-02-12 09:49:07 -0600 | [diff] [blame] | 1057 | PNG_EXPORTA(18, png_infop, png_create_info_struct, (png_structp png_ptr), |
Glenn Randers-Pehrson | 23d3970 | 2010-12-06 18:28:02 -0600 | [diff] [blame] | 1058 | PNG_ALLOCATED); |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 1059 | |
Glenn Randers-Pehrson | c36bb79 | 2011-02-12 09:49:07 -0600 | [diff] [blame] | 1060 | PNG_EXPORT(19, void, png_info_init_3, (png_infopp info_ptr, |
Glenn Randers-Pehrson | 23d3970 | 2010-12-06 18:28:02 -0600 | [diff] [blame] | 1061 | png_size_t png_info_struct_size)); |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 1062 | |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 1063 | /* Writes all the PNG information before the image. */ |
Glenn Randers-Pehrson | 23d3970 | 2010-12-06 18:28:02 -0600 | [diff] [blame] | 1064 | PNG_EXPORT(20, void, png_write_info_before_PLTE, |
| 1065 | (png_structp png_ptr, png_infop info_ptr)); |
| 1066 | PNG_EXPORT(21, void, png_write_info, |
| 1067 | (png_structp png_ptr, png_infop info_ptr)); |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 1068 | |
Glenn Randers-Pehrson | dbd4014 | 2009-08-31 08:42:02 -0500 | [diff] [blame] | 1069 | #ifdef PNG_SEQUENTIAL_READ_SUPPORTED |
Glenn Randers-Pehrson | 6c7a09a | 2009-06-15 21:57:39 -0500 | [diff] [blame] | 1070 | /* Read the information before the actual image data. */ |
Glenn Randers-Pehrson | 23d3970 | 2010-12-06 18:28:02 -0600 | [diff] [blame] | 1071 | PNG_EXPORT(22, void, png_read_info, |
| 1072 | (png_structp png_ptr, png_infop info_ptr)); |
Glenn Randers-Pehrson | 5fea36f | 2004-07-28 08:20:44 -0500 | [diff] [blame] | 1073 | #endif |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 1074 | |
Glenn Randers-Pehrson | 4e6b5e9 | 2009-09-23 10:24:53 -0500 | [diff] [blame] | 1075 | #ifdef PNG_TIME_RFC1123_SUPPORTED |
Glenn Randers-Pehrson | 23d3970 | 2010-12-06 18:28:02 -0600 | [diff] [blame] | 1076 | PNG_EXPORT(23, png_const_charp, png_convert_to_rfc1123, |
Glenn Randers-Pehrson | c36bb79 | 2011-02-12 09:49:07 -0600 | [diff] [blame] | 1077 | (png_structp png_ptr, |
Glenn Randers-Pehrson | 23d3970 | 2010-12-06 18:28:02 -0600 | [diff] [blame] | 1078 | png_const_timep ptime)); |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame] | 1079 | #endif |
Glenn Randers-Pehrson | b6ce43d | 1998-01-01 07:13:13 -0600 | [diff] [blame] | 1080 | |
Glenn Randers-Pehrson | 0cb46e2 | 2009-11-02 11:24:33 -0600 | [diff] [blame] | 1081 | #ifdef PNG_CONVERT_tIME_SUPPORTED |
Glenn Randers-Pehrson | 6c7a09a | 2009-06-15 21:57:39 -0500 | [diff] [blame] | 1082 | /* Convert from a struct tm to png_time */ |
Glenn Randers-Pehrson | c36bb79 | 2011-02-12 09:49:07 -0600 | [diff] [blame] | 1083 | PNG_EXPORT(24, void, png_convert_from_struct_tm, (png_timep ptime, |
Glenn Randers-Pehrson | 23d3970 | 2010-12-06 18:28:02 -0600 | [diff] [blame] | 1084 | PNG_CONST struct tm FAR * ttime)); |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 1085 | |
Glenn Randers-Pehrson | 6c7a09a | 2009-06-15 21:57:39 -0500 | [diff] [blame] | 1086 | /* Convert from time_t to png_time. Uses gmtime() */ |
Glenn Randers-Pehrson | 23d3970 | 2010-12-06 18:28:02 -0600 | [diff] [blame] | 1087 | PNG_EXPORT(25, void, png_convert_from_time_t, |
| 1088 | (png_timep ptime, time_t ttime)); |
Glenn Randers-Pehrson | 0cb46e2 | 2009-11-02 11:24:33 -0600 | [diff] [blame] | 1089 | #endif /* PNG_CONVERT_tIME_SUPPORTED */ |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 1090 | |
Glenn Randers-Pehrson | 4e6b5e9 | 2009-09-23 10:24:53 -0500 | [diff] [blame] | 1091 | #ifdef PNG_READ_EXPAND_SUPPORTED |
Glenn Randers-Pehrson | 4393a9a | 1999-09-17 12:27:26 -0500 | [diff] [blame] | 1092 | /* Expand data to 24-bit RGB, or 8-bit grayscale, with alpha if available. */ |
Glenn Randers-Pehrson | 23d3970 | 2010-12-06 18:28:02 -0600 | [diff] [blame] | 1093 | PNG_EXPORT(26, void, png_set_expand, (png_structp png_ptr)); |
| 1094 | PNG_EXPORT(27, void, png_set_expand_gray_1_2_4_to_8, (png_structp png_ptr)); |
| 1095 | PNG_EXPORT(28, void, png_set_palette_to_rgb, (png_structp png_ptr)); |
| 1096 | PNG_EXPORT(29, void, png_set_tRNS_to_alpha, (png_structp png_ptr)); |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame] | 1097 | #endif |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 1098 | |
John Bowler | 4d56296 | 2011-02-12 09:01:20 -0600 | [diff] [blame] | 1099 | #ifdef PNG_READ_EXPAND_16_SUPPORTED |
Glenn Randers-Pehrson | d768d10 | 2011-05-08 23:26:19 -0500 | [diff] [blame] | 1100 | /* 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] | 1101 | * of a tRNS chunk if present. |
| 1102 | */ |
| 1103 | PNG_EXPORT(221, void, png_set_expand_16, (png_structp png_ptr)); |
| 1104 | #endif |
| 1105 | |
Guy Schalnat | 51f0eb4 | 1995-09-26 05:22:39 -0500 | [diff] [blame] | 1106 | #if defined(PNG_READ_BGR_SUPPORTED) || defined(PNG_WRITE_BGR_SUPPORTED) |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 1107 | /* Use blue, green, red order for pixels. */ |
Glenn Randers-Pehrson | 23d3970 | 2010-12-06 18:28:02 -0600 | [diff] [blame] | 1108 | PNG_EXPORT(30, void, png_set_bgr, (png_structp png_ptr)); |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame] | 1109 | #endif |
Guy Schalnat | 51f0eb4 | 1995-09-26 05:22:39 -0500 | [diff] [blame] | 1110 | |
Glenn Randers-Pehrson | 4e6b5e9 | 2009-09-23 10:24:53 -0500 | [diff] [blame] | 1111 | #ifdef PNG_READ_GRAY_TO_RGB_SUPPORTED |
Glenn Randers-Pehrson | 4393a9a | 1999-09-17 12:27:26 -0500 | [diff] [blame] | 1112 | /* Expand the grayscale to 24-bit RGB if necessary. */ |
Glenn Randers-Pehrson | 23d3970 | 2010-12-06 18:28:02 -0600 | [diff] [blame] | 1113 | PNG_EXPORT(31, void, png_set_gray_to_rgb, (png_structp png_ptr)); |
John Bowler | f21a0d0 | 2011-01-23 23:55:19 -0600 | [diff] [blame] | 1114 | #endif |
Guy Schalnat | 69b1448 | 1996-01-10 02:56:49 -0600 | [diff] [blame] | 1115 | |
John Bowler | f21a0d0 | 2011-01-23 23:55:19 -0600 | [diff] [blame] | 1116 | #ifdef PNG_READ_RGB_TO_GRAY_SUPPORTED |
Glenn Randers-Pehrson | 5c6aeb2 | 1998-12-29 11:47:59 -0600 | [diff] [blame] | 1117 | /* Reduce RGB to grayscale. */ |
Glenn Randers-Pehrson | 23d3970 | 2010-12-06 18:28:02 -0600 | [diff] [blame] | 1118 | PNG_FP_EXPORT(32, void, png_set_rgb_to_gray, (png_structp png_ptr, |
| 1119 | int error_action, double red, double green)); |
Glenn Randers-Pehrson | c36bb79 | 2011-02-12 09:49:07 -0600 | [diff] [blame] | 1120 | PNG_FIXED_EXPORT(33, void, png_set_rgb_to_gray_fixed, (png_structp png_ptr, |
Glenn Randers-Pehrson | 23d3970 | 2010-12-06 18:28:02 -0600 | [diff] [blame] | 1121 | int error_action, png_fixed_point red, png_fixed_point green)); |
Glenn Randers-Pehrson | a272d8f | 2010-06-25 21:45:31 -0500 | [diff] [blame] | 1122 | |
John Bowler | 0a5c9c0 | 2011-01-22 17:36:34 -0600 | [diff] [blame] | 1123 | PNG_EXPORT(34, png_byte, png_get_rgb_to_gray_status, (png_const_structp |
Glenn Randers-Pehrson | b86b492 | 2011-01-21 23:12:51 -0600 | [diff] [blame] | 1124 | png_ptr)); |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame] | 1125 | #endif |
Andreas Dilger | 02ad0ef | 1997-01-17 01:34:35 -0600 | [diff] [blame] | 1126 | |
John Bowler | 4a12f4a | 2011-04-17 18:34:22 -0500 | [diff] [blame] | 1127 | #ifdef PNG_BUILD_GRAYSCALE_PALETTE_SUPPORTED |
Glenn Randers-Pehrson | c36bb79 | 2011-02-12 09:49:07 -0600 | [diff] [blame] | 1128 | PNG_EXPORT(35, void, png_build_grayscale_palette, (int bit_depth, |
Glenn Randers-Pehrson | 23d3970 | 2010-12-06 18:28:02 -0600 | [diff] [blame] | 1129 | png_colorp palette)); |
John Bowler | 4a12f4a | 2011-04-17 18:34:22 -0500 | [diff] [blame] | 1130 | #endif |
Andreas Dilger | 02ad0ef | 1997-01-17 01:34:35 -0600 | [diff] [blame] | 1131 | |
John Bowler | d273ad2 | 2011-05-07 21:00:28 -0500 | [diff] [blame] | 1132 | #ifdef PNG_READ_ALPHA_MODE_SUPPORTED |
| 1133 | /* 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] | 1134 | * a PNG file are returned when an alpha channel, or tRNS chunk in a palette |
| 1135 | * file, is present. |
John Bowler | d273ad2 | 2011-05-07 21:00:28 -0500 | [diff] [blame] | 1136 | * |
Glenn Randers-Pehrson | 44e26d4 | 2011-05-08 22:56:42 -0500 | [diff] [blame] | 1137 | * This has no effect on the way pixels are written into a PNG output |
| 1138 | * datastream. The color samples in a PNG datastream are never premultiplied |
| 1139 | * with the alpha samples. |
| 1140 | * |
| 1141 | * 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] | 1142 | * 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] | 1143 | * corresponding composited pixel. The gamma encoded color channels must be |
| 1144 | * scaled according to the contribution and to do this it is necessary to undo |
| 1145 | * the encoding, scale the color values, perform the composition and reencode |
| 1146 | * the values. This is the 'PNG' mode. |
John Bowler | d273ad2 | 2011-05-07 21:00:28 -0500 | [diff] [blame] | 1147 | * |
| 1148 | * The alternative is to 'associate' the alpha with the color information by |
| 1149 | * storing color channel values that have been scaled by the alpha. The |
| 1150 | * advantage is that the color channels can be resampled (the image can be |
| 1151 | * 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] | 1152 | * linear, not (gamma) encoded, values and this requires 16-bit channels for |
| 1153 | * 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] | 1154 | * gamma encoding is used. In addition all non-transparent pixel values, |
| 1155 | * 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] | 1156 | * image. This is the 'STANDARD', 'ASSOCIATED' or 'PREMULTIPLIED' mode (the |
John Bowler | d273ad2 | 2011-05-07 21:00:28 -0500 | [diff] [blame] | 1157 | * latter being the two common names for associated alpha color channels.) |
| 1158 | * |
| 1159 | * Since it is not necessary to perform arithmetic on opaque color values so |
| 1160 | * long as they are not to be resampled and are in the final color space it is |
| 1161 | * possible to optimize the handling of alpha by storing the opaque pixels in |
| 1162 | * the PNG format (adjusted for the output color space) while storing partially |
| 1163 | * opaque pixels in the standard, linear, format. The accuracy required for |
| 1164 | * standard alpha composition is relatively low, because the pixels are |
Glenn Randers-Pehrson | d768d10 | 2011-05-08 23:26:19 -0500 | [diff] [blame] | 1165 | * isolated, therefore typically the accuracy loss in storing 8-bit linear |
John Bowler | d273ad2 | 2011-05-07 21:00:28 -0500 | [diff] [blame] | 1166 | * 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] | 1167 | * simulate transparency over large areas - use 16 bits or the PNG mode in |
| 1168 | * 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] | 1169 | * treated as opaque only if the alpha value is equal to the maximum value. |
| 1170 | * |
| 1171 | * The final choice is to gamma encode the alpha channel as well. This is |
| 1172 | * broken because, in practice, no implementation that uses this choice |
| 1173 | * correctly undoes the encoding before handling alpha composition. Use this |
| 1174 | * choice only if other serious errors in the software or hardware you use |
| 1175 | * mandate it; the typical serious error is for dark halos to appear around |
| 1176 | * opaque areas of the composited PNG image because of arithmetic overflow. |
| 1177 | * |
| 1178 | * 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] | 1179 | * with an enumerated 'mode' value and the gamma of the required output: |
John Bowler | d273ad2 | 2011-05-07 21:00:28 -0500 | [diff] [blame] | 1180 | */ |
| 1181 | #define PNG_ALPHA_PNG 0 /* according to the PNG standard */ |
| 1182 | #define PNG_ALPHA_STANDARD 1 /* according to Porter/Duff */ |
| 1183 | #define PNG_ALPHA_ASSOCIATED 1 /* as above; this is the normal practice */ |
| 1184 | #define PNG_ALPHA_PREMULTIPLIED 1 /* as above */ |
| 1185 | #define PNG_ALPHA_OPTIMIZED 2 /* 'PNG' for opaque pixels, else 'STANDARD' */ |
| 1186 | #define PNG_ALPHA_BROKEN 3 /* the alpha channel is gamma encoded */ |
| 1187 | |
| 1188 | PNG_FP_EXPORT(227, void, png_set_alpha_mode, (png_structp png_ptr, int mode, |
| 1189 | double output_gamma)); |
| 1190 | PNG_FIXED_EXPORT(228, void, png_set_alpha_mode_fixed, (png_structp png_ptr, |
| 1191 | int mode, png_fixed_point output_gamma)); |
John Bowler | f70c7d0 | 2011-05-10 22:54:37 -0500 | [diff] [blame] | 1192 | #endif |
John Bowler | d273ad2 | 2011-05-07 21:00:28 -0500 | [diff] [blame] | 1193 | |
John Bowler | f70c7d0 | 2011-05-10 22:54:37 -0500 | [diff] [blame] | 1194 | #if defined(PNG_READ_GAMMA_SUPPORTED) || defined(PNG_READ_ALPHA_MODE_SUPPORTED) |
John Bowler | d273ad2 | 2011-05-07 21:00:28 -0500 | [diff] [blame] | 1195 | /* The output_gamma value is a screen gamma in libpng terminology: it expresses |
| 1196 | * how to decode the output values, not how they are encoded. The values used |
| 1197 | * correspond to the normal numbers used to describe the overall gamma of a |
| 1198 | * computer display system; for example 2.2 for an sRGB conformant system. The |
| 1199 | * values are scaled by 100000 in the _fixed version of the API (so 220000 for |
| 1200 | * sRGB.) |
| 1201 | * |
| 1202 | * The inverse of the value is always used to provide a default for the PNG file |
| 1203 | * encoding if it has no gAMA chunk and if png_set_gamma() has not been called |
| 1204 | * to override the PNG gamma information. |
| 1205 | * |
| 1206 | * When the ALPHA_OPTIMIZED mode is selected the output gamma is used to encode |
| 1207 | * opaque pixels however pixels with lower alpha values are not encoded, |
| 1208 | * regardless of the output gamma setting. |
| 1209 | * |
| 1210 | * When the standard Porter Duff handling is requested with mode 1 the output |
| 1211 | * encoding is set to be linear and the output_gamma value is only relevant |
| 1212 | * as a default for input data that has no gamma information. The linear output |
| 1213 | * encoding will be overridden if png_set_gamma() is called - the results may be |
| 1214 | * highly unexpected! |
| 1215 | * |
| 1216 | * The following numbers are derived from the sRGB standard and the research |
| 1217 | * behind it. sRGB is defined to be approximated by a PNG gAMA chunk value of |
| 1218 | * 0.45455 (1/2.2) for PNG. The value implicitly includes any viewing |
| 1219 | * correction required to take account of any differences in the color |
| 1220 | * environment of the original scene and the intended display environment; the |
| 1221 | * value expresses how to *decode* the image for display, not how the original |
| 1222 | * data was *encoded*. |
| 1223 | * |
| 1224 | * sRGB provides a peg for the PNG standard by defining a viewing environment. |
| 1225 | * sRGB itself, and earlier TV standards, actually use a more complex transform |
| 1226 | * (a linear portion then a gamma 2.4 power law) than PNG can express. (PNG is |
| 1227 | * limited to simple power laws.) By saying that an image for direct display on |
| 1228 | * an sRGB conformant system should be stored with a gAMA chunk value of 45455 |
| 1229 | * (11.3.3.2 and 11.3.3.5 of the ISO PNG specification) the PNG specification |
| 1230 | * makes it possible to derive values for other display systems and |
| 1231 | * environments. |
| 1232 | * |
| 1233 | * The Mac value is deduced from the sRGB based on an assumption that the actual |
| 1234 | * extra viewing correction used in early Mac display systems was implemented as |
| 1235 | * a power 1.45 lookup table. |
| 1236 | * |
| 1237 | * Any system where a programmable lookup table is used or where the behavior of |
| 1238 | * the final display device characteristics can be changed requires system |
| 1239 | * specific code to obtain the current characteristic. However this can be |
| 1240 | * difficult and most PNG gamma correction only requires an approximate value. |
| 1241 | * |
| 1242 | * By default, if png_set_alpha_mode() is not called, libpng assumes that all |
| 1243 | * values are unencoded, linear, values and that the output device also has a |
| 1244 | * linear characteristic. This is only very rarely correct - it is invariably |
| 1245 | * better to call png_set_alpha_mode() with PNG_DEFAULT_sRGB than rely on the |
| 1246 | * default if you don't know what the right answer is! |
| 1247 | * |
John Bowler | f70c7d0 | 2011-05-10 22:54:37 -0500 | [diff] [blame] | 1248 | * The special value PNG_GAMMA_MAC_18 indicates an older Mac system (pre Mac OS |
| 1249 | * 10.6) which used a correction table to implement a somewhat lower gamma on an |
| 1250 | * otherwise sRGB system. |
| 1251 | * |
| 1252 | * Both these values are reserved (not simple gamma values) in order to allow |
| 1253 | * more precise correction internally in the future. |
| 1254 | * |
John Bowler | d273ad2 | 2011-05-07 21:00:28 -0500 | [diff] [blame] | 1255 | * NOTE: the following values can be passed to either the fixed or floating |
| 1256 | * point APIs, but the floating point API will also accept floating point |
| 1257 | * values. |
| 1258 | */ |
John Bowler | f70c7d0 | 2011-05-10 22:54:37 -0500 | [diff] [blame] | 1259 | #define PNG_DEFAULT_sRGB -1 /* sRGB gamma and color space */ |
| 1260 | #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] | 1261 | #define PNG_GAMMA_sRGB 220000 /* Television standards--matches sRGB gamma */ |
John Bowler | d273ad2 | 2011-05-07 21:00:28 -0500 | [diff] [blame] | 1262 | #define PNG_GAMMA_LINEAR PNG_FP_1 /* Linear */ |
John Bowler | f70c7d0 | 2011-05-10 22:54:37 -0500 | [diff] [blame] | 1263 | #endif |
John Bowler | d273ad2 | 2011-05-07 21:00:28 -0500 | [diff] [blame] | 1264 | |
| 1265 | /* The following are examples of calls to png_set_alpha_mode to achieve the |
| 1266 | * required overall gamma correction and, where necessary, alpha |
| 1267 | * premultiplication. |
| 1268 | * |
| 1269 | * png_set_alpha_mode(pp, PNG_ALPHA_PNG, PNG_DEFAULT_sRGB); |
| 1270 | * This is the default libpng handling of the alpha channel - it is not |
| 1271 | * pre-multiplied into the color components. In addition the call states |
| 1272 | * that the output is for a sRGB system and causes all PNG files without gAMA |
| 1273 | * chunks to be assumed to be encoded using sRGB. |
| 1274 | * |
| 1275 | * png_set_alpha_mode(pp, PNG_ALPHA_PNG, PNG_GAMMA_MAC); |
| 1276 | * In this case the output is assumed to be something like an sRGB conformant |
| 1277 | * display preceeded by a power-law lookup table of power 1.45. This is how |
| 1278 | * early Mac systems behaved. |
| 1279 | * |
Glenn Randers-Pehrson | c782251 | 2011-05-07 21:23:43 -0500 | [diff] [blame] | 1280 | * png_set_alpha_mode(pp, PNG_ALPHA_STANDARD, PNG_GAMMA_LINEAR); |
John Bowler | d273ad2 | 2011-05-07 21:00:28 -0500 | [diff] [blame] | 1281 | * This is the classic Jim Blinn approach and will work in academic |
| 1282 | * environments where everything is done by the book. It has the shortcoming |
| 1283 | * of assuming that input PNG data with no gamma information is linear - this |
| 1284 | * is unlikely to be correct unless the PNG files where generated locally. |
| 1285 | * Most of the time the output precision will be so low as to show |
| 1286 | * significant banding in dark areas of the image. |
| 1287 | * |
| 1288 | * png_set_expand_16(pp); |
| 1289 | * png_set_alpha_mode(pp, PNG_ALPHA_STANDARD, PNG_DEFAULT_sRGB); |
| 1290 | * This is a somewhat more realistic Jim Blinn inspired approach. PNG files |
| 1291 | * are assumed to have the sRGB encoding if not marked with a gamma value and |
| 1292 | * the output is always 16 bits per component. This permits accurate scaling |
| 1293 | * and processing of the data. If you know that your input PNG files were |
| 1294 | * generated locally you might need to replace PNG_DEFAULT_sRGB with the |
| 1295 | * correct value for your system. |
| 1296 | * |
| 1297 | * png_set_alpha_mode(pp, PNG_ALPHA_OPTIMIZED, PNG_DEFAULT_sRGB); |
| 1298 | * If you just need to composite the PNG image onto an existing background |
| 1299 | * and if you control the code that does this you can use the optimization |
| 1300 | * setting. In this case you just copy completely opaque pixels to the |
| 1301 | * output. For pixels that are not completely transparent (you just skip |
| 1302 | * 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] | 1303 | * 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] | 1304 | * encoding. |
| 1305 | * |
| 1306 | * Other cases |
| 1307 | * If neither the PNG nor the standard linear encoding work for you because |
| 1308 | * of the software or hardware you use then you have a big problem. The PNG |
| 1309 | * case will probably result in halos around the image. The linear encoding |
| 1310 | * will probably result in a washed out, too bright, image (it's actually too |
| 1311 | * contrasty.) Try the ALPHA_OPTIMIZED mode above - this will probably |
| 1312 | * substantially reduce the halos. Alternatively try: |
| 1313 | * |
| 1314 | * png_set_alpha_mode(pp, PNG_ALPHA_BROKEN, PNG_DEFAULT_sRGB); |
| 1315 | * This option will also reduce the halos, but there will be slight dark |
| 1316 | * halos round the opaque parts of the image where the background is light. |
| 1317 | * In the OPTIMIZED mode the halos will be light halos where the background |
| 1318 | * is dark. Take your pick - the halos are unavoidable unless you can get |
| 1319 | * your hardware/software fixed! (The OPTIMIZED approach is slightly |
| 1320 | * faster.) |
| 1321 | * |
| 1322 | * When the default gamma of PNG files doesn't match the output gamma. |
| 1323 | * If you have PNG files with no gamma information png_set_alpha_mode allows |
| 1324 | * you to provide a default gamma, but it also sets the ouput gamma to the |
| 1325 | * matching value. If you know your PNG files have a gamma that doesn't |
| 1326 | * match the output you can take advantage of the fact that |
| 1327 | * png_set_alpha_mode always sets the output gamma but only sets the PNG |
| 1328 | * default if it is not already set: |
| 1329 | * |
| 1330 | * png_set_alpha_mode(pp, PNG_ALPHA_PNG, PNG_DEFAULT_sRGB); |
| 1331 | * png_set_alpha_mode(pp, PNG_ALPHA_PNG, PNG_GAMMA_MAC); |
| 1332 | * The first call sets both the default and the output gamma values, the |
| 1333 | * second call overrides the output gamma without changing the default. This |
| 1334 | * is easier than achieving the same effect with png_set_gamma. You must use |
| 1335 | * PNG_ALPHA_PNG for the first call - internal checking in png_set_alpha will |
| 1336 | * fire if more than one call to png_set_alpha_mode and png_set_background is |
| 1337 | * made in the same read operation, however multiple calls with PNG_ALPHA_PNG |
| 1338 | * are ignored. |
| 1339 | */ |
John Bowler | d273ad2 | 2011-05-07 21:00:28 -0500 | [diff] [blame] | 1340 | |
Glenn Randers-Pehrson | 4e6b5e9 | 2009-09-23 10:24:53 -0500 | [diff] [blame] | 1341 | #ifdef PNG_READ_STRIP_ALPHA_SUPPORTED |
Glenn Randers-Pehrson | 23d3970 | 2010-12-06 18:28:02 -0600 | [diff] [blame] | 1342 | PNG_EXPORT(36, void, png_set_strip_alpha, (png_structp png_ptr)); |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame] | 1343 | #endif |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 1344 | |
| 1345 | #if defined(PNG_READ_SWAP_ALPHA_SUPPORTED) || \ |
| 1346 | defined(PNG_WRITE_SWAP_ALPHA_SUPPORTED) |
Glenn Randers-Pehrson | 23d3970 | 2010-12-06 18:28:02 -0600 | [diff] [blame] | 1347 | PNG_EXPORT(37, void, png_set_swap_alpha, (png_structp png_ptr)); |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame] | 1348 | #endif |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 1349 | |
Glenn Randers-Pehrson | c4a2ae6 | 1998-01-16 22:06:18 -0600 | [diff] [blame] | 1350 | #if defined(PNG_READ_INVERT_ALPHA_SUPPORTED) || \ |
| 1351 | defined(PNG_WRITE_INVERT_ALPHA_SUPPORTED) |
Glenn Randers-Pehrson | 23d3970 | 2010-12-06 18:28:02 -0600 | [diff] [blame] | 1352 | PNG_EXPORT(38, void, png_set_invert_alpha, (png_structp png_ptr)); |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame] | 1353 | #endif |
Glenn Randers-Pehrson | c4a2ae6 | 1998-01-16 22:06:18 -0600 | [diff] [blame] | 1354 | |
Guy Schalnat | 51f0eb4 | 1995-09-26 05:22:39 -0500 | [diff] [blame] | 1355 | #if defined(PNG_READ_FILLER_SUPPORTED) || defined(PNG_WRITE_FILLER_SUPPORTED) |
Glenn Randers-Pehrson | 67864af | 2004-08-28 23:30:07 -0500 | [diff] [blame] | 1356 | /* Add a filler byte to 8-bit Gray or 24-bit RGB images. */ |
Glenn Randers-Pehrson | c36bb79 | 2011-02-12 09:49:07 -0600 | [diff] [blame] | 1357 | PNG_EXPORT(39, void, png_set_filler, (png_structp png_ptr, png_uint_32 filler, |
Glenn Randers-Pehrson | 23d3970 | 2010-12-06 18:28:02 -0600 | [diff] [blame] | 1358 | int flags)); |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 1359 | /* The values of the PNG_FILLER_ defines should NOT be changed */ |
Glenn Randers-Pehrson | d4df36c | 2010-03-06 10:45:55 -0600 | [diff] [blame] | 1360 | # define PNG_FILLER_BEFORE 0 |
| 1361 | # define PNG_FILLER_AFTER 1 |
Glenn Randers-Pehrson | 67864af | 2004-08-28 23:30:07 -0500 | [diff] [blame] | 1362 | /* Add an alpha byte to 8-bit Gray or 24-bit RGB images. */ |
Glenn Randers-Pehrson | 23d3970 | 2010-12-06 18:28:02 -0600 | [diff] [blame] | 1363 | PNG_EXPORT(40, void, png_set_add_alpha, |
Glenn Randers-Pehrson | c36bb79 | 2011-02-12 09:49:07 -0600 | [diff] [blame] | 1364 | (png_structp png_ptr, png_uint_32 filler, |
Glenn Randers-Pehrson | 23d3970 | 2010-12-06 18:28:02 -0600 | [diff] [blame] | 1365 | int flags)); |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 1366 | #endif /* PNG_READ_FILLER_SUPPORTED || PNG_WRITE_FILLER_SUPPORTED */ |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 1367 | |
Guy Schalnat | 51f0eb4 | 1995-09-26 05:22:39 -0500 | [diff] [blame] | 1368 | #if defined(PNG_READ_SWAP_SUPPORTED) || defined(PNG_WRITE_SWAP_SUPPORTED) |
Glenn Randers-Pehrson | 4393a9a | 1999-09-17 12:27:26 -0500 | [diff] [blame] | 1369 | /* Swap bytes in 16-bit depth files. */ |
Glenn Randers-Pehrson | 23d3970 | 2010-12-06 18:28:02 -0600 | [diff] [blame] | 1370 | PNG_EXPORT(41, void, png_set_swap, (png_structp png_ptr)); |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame] | 1371 | #endif |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 1372 | |
Guy Schalnat | 51f0eb4 | 1995-09-26 05:22:39 -0500 | [diff] [blame] | 1373 | #if defined(PNG_READ_PACK_SUPPORTED) || defined(PNG_WRITE_PACK_SUPPORTED) |
Glenn Randers-Pehrson | 4393a9a | 1999-09-17 12:27:26 -0500 | [diff] [blame] | 1374 | /* Use 1 byte per pixel in 1, 2, or 4-bit depth files. */ |
Glenn Randers-Pehrson | 23d3970 | 2010-12-06 18:28:02 -0600 | [diff] [blame] | 1375 | PNG_EXPORT(42, void, png_set_packing, (png_structp png_ptr)); |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame] | 1376 | #endif |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 1377 | |
Glenn Randers-Pehrson | e3f3c4e | 2010-02-07 18:08:50 -0600 | [diff] [blame] | 1378 | #if defined(PNG_READ_PACKSWAP_SUPPORTED) || \ |
| 1379 | defined(PNG_WRITE_PACKSWAP_SUPPORTED) |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 1380 | /* Swap packing order of pixels in bytes. */ |
Glenn Randers-Pehrson | 23d3970 | 2010-12-06 18:28:02 -0600 | [diff] [blame] | 1381 | PNG_EXPORT(43, void, png_set_packswap, (png_structp png_ptr)); |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame] | 1382 | #endif |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 1383 | |
Guy Schalnat | 51f0eb4 | 1995-09-26 05:22:39 -0500 | [diff] [blame] | 1384 | #if defined(PNG_READ_SHIFT_SUPPORTED) || defined(PNG_WRITE_SHIFT_SUPPORTED) |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 1385 | /* Converts files to legal bit depths. */ |
Glenn Randers-Pehrson | 23d3970 | 2010-12-06 18:28:02 -0600 | [diff] [blame] | 1386 | PNG_EXPORT(44, void, png_set_shift, (png_structp png_ptr, png_const_color_8p |
| 1387 | true_bits)); |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame] | 1388 | #endif |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 1389 | |
Guy Schalnat | 51f0eb4 | 1995-09-26 05:22:39 -0500 | [diff] [blame] | 1390 | #if defined(PNG_READ_INTERLACING_SUPPORTED) || \ |
| 1391 | defined(PNG_WRITE_INTERLACING_SUPPORTED) |
Glenn Randers-Pehrson | 31aee0d | 2010-07-29 17:39:14 -0500 | [diff] [blame] | 1392 | /* Have the code handle the interlacing. Returns the number of passes. |
Glenn Randers-Pehrson | 9f044c1 | 2010-12-07 14:59:43 -0600 | [diff] [blame] | 1393 | * MUST be called before png_read_update_info or png_start_read_image, |
| 1394 | * otherwise it will not have the desired effect. Note that it is still |
| 1395 | * necessary to call png_read_row or png_read_rows png_get_image_height |
| 1396 | * times for each pass. |
| 1397 | */ |
Glenn Randers-Pehrson | 23d3970 | 2010-12-06 18:28:02 -0600 | [diff] [blame] | 1398 | PNG_EXPORT(45, int, png_set_interlace_handling, (png_structp png_ptr)); |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame] | 1399 | #endif |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 1400 | |
Guy Schalnat | 51f0eb4 | 1995-09-26 05:22:39 -0500 | [diff] [blame] | 1401 | #if defined(PNG_READ_INVERT_SUPPORTED) || defined(PNG_WRITE_INVERT_SUPPORTED) |
Glenn Randers-Pehrson | 104622b | 2000-05-29 08:58:03 -0500 | [diff] [blame] | 1402 | /* Invert monochrome files */ |
Glenn Randers-Pehrson | 23d3970 | 2010-12-06 18:28:02 -0600 | [diff] [blame] | 1403 | PNG_EXPORT(46, void, png_set_invert_mono, (png_structp png_ptr)); |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame] | 1404 | #endif |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 1405 | |
Glenn Randers-Pehrson | 4e6b5e9 | 2009-09-23 10:24:53 -0500 | [diff] [blame] | 1406 | #ifdef PNG_READ_BACKGROUND_SUPPORTED |
John Bowler | cb0b296 | 2011-05-12 21:48:29 -0500 | [diff] [blame] | 1407 | /* 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] | 1408 | * 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] | 1409 | * 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] | 1410 | * errors if the PNG file contains a bKGD chunk. |
John Bowler | cb0b296 | 2011-05-12 21:48:29 -0500 | [diff] [blame] | 1411 | */ |
Glenn Randers-Pehrson | c36bb79 | 2011-02-12 09:49:07 -0600 | [diff] [blame] | 1412 | PNG_FP_EXPORT(47, void, png_set_background, (png_structp png_ptr, |
| 1413 | png_const_color_16p background_color, int background_gamma_code, |
Glenn Randers-Pehrson | 23d3970 | 2010-12-06 18:28:02 -0600 | [diff] [blame] | 1414 | int need_expand, double background_gamma)); |
John Bowler | 660c6e4 | 2010-12-19 06:22:23 -0600 | [diff] [blame] | 1415 | PNG_FIXED_EXPORT(215, void, png_set_background_fixed, (png_structp png_ptr, |
Glenn Randers-Pehrson | c36bb79 | 2011-02-12 09:49:07 -0600 | [diff] [blame] | 1416 | png_const_color_16p background_color, int background_gamma_code, |
Glenn Randers-Pehrson | 23d3970 | 2010-12-06 18:28:02 -0600 | [diff] [blame] | 1417 | int need_expand, png_fixed_point background_gamma)); |
Glenn Randers-Pehrson | 31aee0d | 2010-07-29 17:39:14 -0500 | [diff] [blame] | 1418 | #endif |
| 1419 | #ifdef PNG_READ_BACKGROUND_SUPPORTED |
Glenn Randers-Pehrson | d4df36c | 2010-03-06 10:45:55 -0600 | [diff] [blame] | 1420 | # define PNG_BACKGROUND_GAMMA_UNKNOWN 0 |
| 1421 | # define PNG_BACKGROUND_GAMMA_SCREEN 1 |
| 1422 | # define PNG_BACKGROUND_GAMMA_FILE 2 |
| 1423 | # define PNG_BACKGROUND_GAMMA_UNIQUE 3 |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame] | 1424 | #endif |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 1425 | |
Glenn Randers-Pehrson | 4e6b5e9 | 2009-09-23 10:24:53 -0500 | [diff] [blame] | 1426 | #ifdef PNG_READ_16_TO_8_SUPPORTED |
Glenn Randers-Pehrson | 5f0b927 | 2011-06-16 09:05:40 -0500 | [diff] [blame] | 1427 | # ifdef PNG_READ_16_TO_8_ACCURATE_SCALE_SUPPORTED |
Glenn Randers-Pehrson | 413138a | 2011-06-13 22:07:37 -0500 | [diff] [blame] | 1428 | /* Scale a 16-bit depth file down to 8-bit, accurately. */ |
Glenn Randers-Pehrson | a7428d4 | 2011-06-17 19:07:04 -0500 | [diff] [blame] | 1429 | PNG_EXPORT(48, void, png_set_scale_16, (png_structp png_ptr)); |
Glenn Randers-Pehrson | 5f0b927 | 2011-06-16 09:05:40 -0500 | [diff] [blame] | 1430 | # endif |
Glenn Randers-Pehrson | ab63dd0 | 2011-06-17 20:04:17 -0500 | [diff] [blame^] | 1431 | |
| 1432 | # ifdef PNG_READ_STRIP_16_TO_8_SUPPORTED |
Glenn Randers-Pehrson | 413138a | 2011-06-13 22:07:37 -0500 | [diff] [blame] | 1433 | /* Strip the second byte of information from a 16-bit depth file. */ |
Glenn Randers-Pehrson | ab63dd0 | 2011-06-17 20:04:17 -0500 | [diff] [blame^] | 1434 | PNG_EXPORT(229, void, png_set_strip_16, (png_structp png_ptr)); |
Glenn Randers-Pehrson | 2232baa | 2011-06-14 06:59:46 -0500 | [diff] [blame] | 1435 | # endif |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame] | 1436 | #endif |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 1437 | |
Glenn Randers-Pehrson | 3cd7cff | 2010-04-16 19:27:08 -0500 | [diff] [blame] | 1438 | #ifdef PNG_READ_QUANTIZE_SUPPORTED |
| 1439 | /* 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] | 1440 | * available. |
| 1441 | */ |
Glenn Randers-Pehrson | 23d3970 | 2010-12-06 18:28:02 -0600 | [diff] [blame] | 1442 | PNG_EXPORT(49, void, png_set_quantize, |
Glenn Randers-Pehrson | c36bb79 | 2011-02-12 09:49:07 -0600 | [diff] [blame] | 1443 | (png_structp png_ptr, png_colorp palette, |
| 1444 | int num_palette, int maximum_colors, png_const_uint_16p histogram, |
Glenn Randers-Pehrson | 23d3970 | 2010-12-06 18:28:02 -0600 | [diff] [blame] | 1445 | int full_quantize)); |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame] | 1446 | #endif |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 1447 | |
Glenn Randers-Pehrson | 4e6b5e9 | 2009-09-23 10:24:53 -0500 | [diff] [blame] | 1448 | #ifdef PNG_READ_GAMMA_SUPPORTED |
Glenn Randers-Pehrson | 31aee0d | 2010-07-29 17:39:14 -0500 | [diff] [blame] | 1449 | /* The threshold on gamma processing is configurable but hard-wired into the |
| 1450 | * library. The following is the floating point variant. |
| 1451 | */ |
| 1452 | #define PNG_GAMMA_THRESHOLD (PNG_GAMMA_THRESHOLD_FIXED*.00001) |
| 1453 | |
John Bowler | d273ad2 | 2011-05-07 21:00:28 -0500 | [diff] [blame] | 1454 | /* Handle gamma correction. Screen_gamma=(display_exponent). |
Glenn Randers-Pehrson | c782251 | 2011-05-07 21:23:43 -0500 | [diff] [blame] | 1455 | * 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] | 1456 | * 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] | 1457 | * the file header has been read - use with care - call before reading the PNG |
| 1458 | * file for best results! |
| 1459 | * |
| 1460 | * These routines accept the same gamma values as png_set_alpha_mode (described |
| 1461 | * above). The PNG_GAMMA_ defines and PNG_DEFAULT_sRGB can be passed to either |
| 1462 | * API (floating point or fixed.) Notice, however, that the 'file_gamma' value |
| 1463 | * is the inverse of a 'screen gamma' value. |
John Bowler | d273ad2 | 2011-05-07 21:00:28 -0500 | [diff] [blame] | 1464 | */ |
Glenn Randers-Pehrson | 23d3970 | 2010-12-06 18:28:02 -0600 | [diff] [blame] | 1465 | PNG_FP_EXPORT(50, void, png_set_gamma, |
Glenn Randers-Pehrson | c36bb79 | 2011-02-12 09:49:07 -0600 | [diff] [blame] | 1466 | (png_structp png_ptr, double screen_gamma, |
John Bowler | d273ad2 | 2011-05-07 21:00:28 -0500 | [diff] [blame] | 1467 | double override_file_gamma)); |
Glenn Randers-Pehrson | c36bb79 | 2011-02-12 09:49:07 -0600 | [diff] [blame] | 1468 | PNG_FIXED_EXPORT(208, void, png_set_gamma_fixed, (png_structp png_ptr, |
John Bowler | d273ad2 | 2011-05-07 21:00:28 -0500 | [diff] [blame] | 1469 | png_fixed_point screen_gamma, png_fixed_point override_file_gamma)); |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame] | 1470 | #endif |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 1471 | |
Glenn Randers-Pehrson | 4e6b5e9 | 2009-09-23 10:24:53 -0500 | [diff] [blame] | 1472 | #ifdef PNG_WRITE_FLUSH_SUPPORTED |
Guy Schalnat | 0f71645 | 1995-11-28 11:22:13 -0600 | [diff] [blame] | 1473 | /* Set how many lines between output flushes - 0 for no flushing */ |
Glenn Randers-Pehrson | 23d3970 | 2010-12-06 18:28:02 -0600 | [diff] [blame] | 1474 | PNG_EXPORT(51, void, png_set_flush, (png_structp png_ptr, int nrows)); |
Guy Schalnat | 0f71645 | 1995-11-28 11:22:13 -0600 | [diff] [blame] | 1475 | /* Flush the current PNG output buffer */ |
Glenn Randers-Pehrson | 23d3970 | 2010-12-06 18:28:02 -0600 | [diff] [blame] | 1476 | PNG_EXPORT(52, void, png_write_flush, (png_structp png_ptr)); |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame] | 1477 | #endif |
Guy Schalnat | 0f71645 | 1995-11-28 11:22:13 -0600 | [diff] [blame] | 1478 | |
Glenn Randers-Pehrson | 6c7a09a | 2009-06-15 21:57:39 -0500 | [diff] [blame] | 1479 | /* Optional update palette with requested transformations */ |
Glenn Randers-Pehrson | 23d3970 | 2010-12-06 18:28:02 -0600 | [diff] [blame] | 1480 | PNG_EXPORT(53, void, png_start_read_image, (png_structp png_ptr)); |
Guy Schalnat | 51f0eb4 | 1995-09-26 05:22:39 -0500 | [diff] [blame] | 1481 | |
Glenn Randers-Pehrson | 6c7a09a | 2009-06-15 21:57:39 -0500 | [diff] [blame] | 1482 | /* Optional call to update the users info structure */ |
Glenn Randers-Pehrson | 23d3970 | 2010-12-06 18:28:02 -0600 | [diff] [blame] | 1483 | PNG_EXPORT(54, void, png_read_update_info, |
| 1484 | (png_structp png_ptr, png_infop info_ptr)); |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 1485 | |
Glenn Randers-Pehrson | dbd4014 | 2009-08-31 08:42:02 -0500 | [diff] [blame] | 1486 | #ifdef PNG_SEQUENTIAL_READ_SUPPORTED |
Glenn Randers-Pehrson | 6c7a09a | 2009-06-15 21:57:39 -0500 | [diff] [blame] | 1487 | /* Read one or more rows of image data. */ |
Glenn Randers-Pehrson | c36bb79 | 2011-02-12 09:49:07 -0600 | [diff] [blame] | 1488 | PNG_EXPORT(55, void, png_read_rows, (png_structp png_ptr, png_bytepp row, |
Glenn Randers-Pehrson | 23d3970 | 2010-12-06 18:28:02 -0600 | [diff] [blame] | 1489 | png_bytepp display_row, png_uint_32 num_rows)); |
Glenn Randers-Pehrson | 5fea36f | 2004-07-28 08:20:44 -0500 | [diff] [blame] | 1490 | #endif |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 1491 | |
Glenn Randers-Pehrson | dbd4014 | 2009-08-31 08:42:02 -0500 | [diff] [blame] | 1492 | #ifdef PNG_SEQUENTIAL_READ_SUPPORTED |
Glenn Randers-Pehrson | 6c7a09a | 2009-06-15 21:57:39 -0500 | [diff] [blame] | 1493 | /* Read a row of data. */ |
Glenn Randers-Pehrson | c36bb79 | 2011-02-12 09:49:07 -0600 | [diff] [blame] | 1494 | PNG_EXPORT(56, void, png_read_row, (png_structp png_ptr, png_bytep row, |
Glenn Randers-Pehrson | 23d3970 | 2010-12-06 18:28:02 -0600 | [diff] [blame] | 1495 | png_bytep display_row)); |
Glenn Randers-Pehrson | 5fea36f | 2004-07-28 08:20:44 -0500 | [diff] [blame] | 1496 | #endif |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 1497 | |
Glenn Randers-Pehrson | dbd4014 | 2009-08-31 08:42:02 -0500 | [diff] [blame] | 1498 | #ifdef PNG_SEQUENTIAL_READ_SUPPORTED |
Glenn Randers-Pehrson | 6c7a09a | 2009-06-15 21:57:39 -0500 | [diff] [blame] | 1499 | /* Read the whole image into memory at once. */ |
Glenn Randers-Pehrson | 23d3970 | 2010-12-06 18:28:02 -0600 | [diff] [blame] | 1500 | PNG_EXPORT(57, void, png_read_image, (png_structp png_ptr, png_bytepp image)); |
Glenn Randers-Pehrson | 5fea36f | 2004-07-28 08:20:44 -0500 | [diff] [blame] | 1501 | #endif |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 1502 | |
Glenn Randers-Pehrson | 6c7a09a | 2009-06-15 21:57:39 -0500 | [diff] [blame] | 1503 | /* Write a row of image data */ |
Glenn Randers-Pehrson | 23d3970 | 2010-12-06 18:28:02 -0600 | [diff] [blame] | 1504 | PNG_EXPORT(58, void, png_write_row, |
| 1505 | (png_structp png_ptr, png_const_bytep row)); |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 1506 | |
Glenn Randers-Pehrson | 9f044c1 | 2010-12-07 14:59:43 -0600 | [diff] [blame] | 1507 | /* Write a few rows of image data: (*row) is not written; however, the type |
| 1508 | * is declared as writeable to maintain compatibility with previous versions |
| 1509 | * 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] | 1510 | * unchanged to write_rows. |
| 1511 | */ |
Glenn Randers-Pehrson | c36bb79 | 2011-02-12 09:49:07 -0600 | [diff] [blame] | 1512 | PNG_EXPORT(59, void, png_write_rows, (png_structp png_ptr, png_bytepp row, |
Glenn Randers-Pehrson | 23d3970 | 2010-12-06 18:28:02 -0600 | [diff] [blame] | 1513 | png_uint_32 num_rows)); |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 1514 | |
Glenn Randers-Pehrson | 6c7a09a | 2009-06-15 21:57:39 -0500 | [diff] [blame] | 1515 | /* Write the image data */ |
Glenn Randers-Pehrson | 23d3970 | 2010-12-06 18:28:02 -0600 | [diff] [blame] | 1516 | PNG_EXPORT(60, void, png_write_image, |
| 1517 | (png_structp png_ptr, png_bytepp image)); |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 1518 | |
Glenn Randers-Pehrson | 6c7a09a | 2009-06-15 21:57:39 -0500 | [diff] [blame] | 1519 | /* Write the end of the PNG file. */ |
Glenn Randers-Pehrson | 23d3970 | 2010-12-06 18:28:02 -0600 | [diff] [blame] | 1520 | PNG_EXPORT(61, void, png_write_end, |
| 1521 | (png_structp png_ptr, png_infop info_ptr)); |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 1522 | |
Glenn Randers-Pehrson | dbd4014 | 2009-08-31 08:42:02 -0500 | [diff] [blame] | 1523 | #ifdef PNG_SEQUENTIAL_READ_SUPPORTED |
Glenn Randers-Pehrson | 6c7a09a | 2009-06-15 21:57:39 -0500 | [diff] [blame] | 1524 | /* Read the end of the PNG file. */ |
Glenn Randers-Pehrson | 23d3970 | 2010-12-06 18:28:02 -0600 | [diff] [blame] | 1525 | PNG_EXPORT(62, void, png_read_end, (png_structp png_ptr, png_infop info_ptr)); |
Glenn Randers-Pehrson | 5fea36f | 2004-07-28 08:20:44 -0500 | [diff] [blame] | 1526 | #endif |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 1527 | |
Glenn Randers-Pehrson | 6c7a09a | 2009-06-15 21:57:39 -0500 | [diff] [blame] | 1528 | /* Free any memory associated with the png_info_struct */ |
Glenn Randers-Pehrson | c36bb79 | 2011-02-12 09:49:07 -0600 | [diff] [blame] | 1529 | PNG_EXPORT(63, void, png_destroy_info_struct, (png_structp png_ptr, |
Glenn Randers-Pehrson | 23d3970 | 2010-12-06 18:28:02 -0600 | [diff] [blame] | 1530 | png_infopp info_ptr_ptr)); |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 1531 | |
Glenn Randers-Pehrson | 6c7a09a | 2009-06-15 21:57:39 -0500 | [diff] [blame] | 1532 | /* 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] | 1533 | 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] | 1534 | png_infopp info_ptr_ptr, png_infopp end_info_ptr_ptr)); |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 1535 | |
Glenn Randers-Pehrson | 6c7a09a | 2009-06-15 21:57:39 -0500 | [diff] [blame] | 1536 | /* 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] | 1537 | 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] | 1538 | png_infopp info_ptr_ptr)); |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 1539 | |
Glenn Randers-Pehrson | 6c7a09a | 2009-06-15 21:57:39 -0500 | [diff] [blame] | 1540 | /* Set the libpng method of handling chunk CRC errors */ |
Glenn Randers-Pehrson | 23d3970 | 2010-12-06 18:28:02 -0600 | [diff] [blame] | 1541 | PNG_EXPORT(66, void, png_set_crc_action, |
| 1542 | (png_structp png_ptr, int crit_action, int ancil_action)); |
Andreas Dilger | 02ad0ef | 1997-01-17 01:34:35 -0600 | [diff] [blame] | 1543 | |
Glenn Randers-Pehrson | 9f044c1 | 2010-12-07 14:59:43 -0600 | [diff] [blame] | 1544 | /* 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] | 1545 | * ancillary and critical chunks, and whether to use the data contained |
| 1546 | * 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] | 1547 | * 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] | 1548 | * whereas in version 0.90 and later, the action for CRC errors in ancillary |
| 1549 | * chunks is warn/discard. These values should NOT be changed. |
| 1550 | * |
| 1551 | * value action:critical action:ancillary |
Andreas Dilger | 02ad0ef | 1997-01-17 01:34:35 -0600 | [diff] [blame] | 1552 | */ |
| 1553 | #define PNG_CRC_DEFAULT 0 /* error/quit warn/discard data */ |
| 1554 | #define PNG_CRC_ERROR_QUIT 1 /* error/quit error/quit */ |
| 1555 | #define PNG_CRC_WARN_DISCARD 2 /* (INVALID) warn/discard data */ |
| 1556 | #define PNG_CRC_WARN_USE 3 /* warn/use data warn/use data */ |
| 1557 | #define PNG_CRC_QUIET_USE 4 /* quiet/use data quiet/use data */ |
| 1558 | #define PNG_CRC_NO_CHANGE 5 /* use current value use current value */ |
| 1559 | |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 1560 | /* These functions give the user control over the scan-line filtering in |
| 1561 | * libpng and the compression methods used by zlib. These functions are |
| 1562 | * mainly useful for testing, as the defaults should work with most users. |
| 1563 | * Those users who are tight on memory or want faster performance at the |
| 1564 | * expense of compression can modify them. See the compression library |
Glenn Randers-Pehrson | b6ce43d | 1998-01-01 07:13:13 -0600 | [diff] [blame] | 1565 | * header file (zlib.h) for an explination of the compression functions. |
| 1566 | */ |
Andreas Dilger | 02ad0ef | 1997-01-17 01:34:35 -0600 | [diff] [blame] | 1567 | |
Glenn Randers-Pehrson | 6c7a09a | 2009-06-15 21:57:39 -0500 | [diff] [blame] | 1568 | /* 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] | 1569 | * value for "method" is 0. |
| 1570 | */ |
Glenn Randers-Pehrson | 23d3970 | 2010-12-06 18:28:02 -0600 | [diff] [blame] | 1571 | PNG_EXPORT(67, void, png_set_filter, |
| 1572 | (png_structp png_ptr, int method, int filters)); |
Guy Schalnat | 51f0eb4 | 1995-09-26 05:22:39 -0500 | [diff] [blame] | 1573 | |
Andreas Dilger | 02ad0ef | 1997-01-17 01:34:35 -0600 | [diff] [blame] | 1574 | /* 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] | 1575 | * are chosen so that they don't conflict with real filter types |
| 1576 | * below, in case they are supplied instead of the #defined constants. |
| 1577 | * These values should NOT be changed. |
Andreas Dilger | 02ad0ef | 1997-01-17 01:34:35 -0600 | [diff] [blame] | 1578 | */ |
| 1579 | #define PNG_NO_FILTERS 0x00 |
| 1580 | #define PNG_FILTER_NONE 0x08 |
| 1581 | #define PNG_FILTER_SUB 0x10 |
| 1582 | #define PNG_FILTER_UP 0x20 |
| 1583 | #define PNG_FILTER_AVG 0x40 |
| 1584 | #define PNG_FILTER_PAETH 0x80 |
| 1585 | #define PNG_ALL_FILTERS (PNG_FILTER_NONE | PNG_FILTER_SUB | PNG_FILTER_UP | \ |
| 1586 | PNG_FILTER_AVG | PNG_FILTER_PAETH) |
| 1587 | |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 1588 | /* Filter values (not flags) - used in pngwrite.c, pngwutil.c for now. |
| 1589 | * These defines should NOT be changed. |
| 1590 | */ |
| 1591 | #define PNG_FILTER_VALUE_NONE 0 |
| 1592 | #define PNG_FILTER_VALUE_SUB 1 |
| 1593 | #define PNG_FILTER_VALUE_UP 2 |
| 1594 | #define PNG_FILTER_VALUE_AVG 3 |
| 1595 | #define PNG_FILTER_VALUE_PAETH 4 |
| 1596 | #define PNG_FILTER_VALUE_LAST 5 |
| 1597 | |
Glenn Randers-Pehrson | 4e6b5e9 | 2009-09-23 10:24:53 -0500 | [diff] [blame] | 1598 | #ifdef PNG_WRITE_WEIGHTED_FILTER_SUPPORTED /* EXPERIMENTAL */ |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 1599 | /* The "heuristic_method" is given by one of the PNG_FILTER_HEURISTIC_ |
| 1600 | * defines, either the default (minimum-sum-of-absolute-differences), or |
| 1601 | * the experimental method (weighted-minimum-sum-of-absolute-differences). |
| 1602 | * |
| 1603 | * Weights are factors >= 1.0, indicating how important it is to keep the |
| 1604 | * filter type consistent between rows. Larger numbers mean the current |
| 1605 | * filter is that many times as likely to be the same as the "num_weights" |
| 1606 | * previous filters. This is cumulative for each previous row with a weight. |
| 1607 | * There needs to be "num_weights" values in "filter_weights", or it can be |
| 1608 | * NULL if the weights aren't being specified. Weights have no influence on |
| 1609 | * the selection of the first row filter. Well chosen weights can (in theory) |
| 1610 | * improve the compression for a given image. |
| 1611 | * |
| 1612 | * Costs are factors >= 1.0 indicating the relative decoding costs of a |
| 1613 | * filter type. Higher costs indicate more decoding expense, and are |
| 1614 | * therefore less likely to be selected over a filter with lower computational |
| 1615 | * costs. There needs to be a value in "filter_costs" for each valid filter |
| 1616 | * type (given by PNG_FILTER_VALUE_LAST), or it can be NULL if you aren't |
| 1617 | * setting the costs. Costs try to improve the speed of decompression without |
| 1618 | * unduly increasing the compressed image size. |
| 1619 | * |
| 1620 | * A negative weight or cost indicates the default value is to be used, and |
| 1621 | * values in the range [0.0, 1.0) indicate the value is to remain unchanged. |
| 1622 | * The default values for both weights and costs are currently 1.0, but may |
| 1623 | * change if good general weighting/cost heuristics can be found. If both |
| 1624 | * the weights and costs are set to 1.0, this degenerates the WEIGHTED method |
| 1625 | * to the UNWEIGHTED method, but with added encoding time/computation. |
| 1626 | */ |
Glenn Randers-Pehrson | c36bb79 | 2011-02-12 09:49:07 -0600 | [diff] [blame] | 1627 | PNG_FP_EXPORT(68, void, png_set_filter_heuristics, (png_structp png_ptr, |
| 1628 | int heuristic_method, int num_weights, png_const_doublep filter_weights, |
Glenn Randers-Pehrson | 23d3970 | 2010-12-06 18:28:02 -0600 | [diff] [blame] | 1629 | png_const_doublep filter_costs)); |
| 1630 | PNG_FIXED_EXPORT(209, void, png_set_filter_heuristics_fixed, |
Glenn Randers-Pehrson | c36bb79 | 2011-02-12 09:49:07 -0600 | [diff] [blame] | 1631 | (png_structp png_ptr, |
Glenn Randers-Pehrson | e600c51 | 2010-08-18 07:25:46 -0500 | [diff] [blame] | 1632 | int heuristic_method, int num_weights, png_const_fixed_point_p |
Glenn Randers-Pehrson | 23d3970 | 2010-12-06 18:28:02 -0600 | [diff] [blame] | 1633 | filter_weights, png_const_fixed_point_p filter_costs)); |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 1634 | #endif /* PNG_WRITE_WEIGHTED_FILTER_SUPPORTED */ |
| 1635 | |
| 1636 | /* Heuristic used for row filter selection. These defines should NOT be |
| 1637 | * changed. |
| 1638 | */ |
| 1639 | #define PNG_FILTER_HEURISTIC_DEFAULT 0 /* Currently "UNWEIGHTED" */ |
| 1640 | #define PNG_FILTER_HEURISTIC_UNWEIGHTED 1 /* Used by libpng < 0.95 */ |
| 1641 | #define PNG_FILTER_HEURISTIC_WEIGHTED 2 /* Experimental feature */ |
| 1642 | #define PNG_FILTER_HEURISTIC_LAST 3 /* Not a valid value */ |
| 1643 | |
John Bowler | c5bef94 | 2011-05-05 17:35:39 -0500 | [diff] [blame] | 1644 | #ifdef PNG_WRITE_SUPPORTED |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 1645 | /* Set the library compression level. Currently, valid values range from |
| 1646 | * 0 - 9, corresponding directly to the zlib compression levels 0 - 9 |
| 1647 | * (0 - no compression, 9 - "maximal" compression). Note that tests have |
| 1648 | * 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] | 1649 | * for PNG images, and do considerably fewer caclulations. In the future, |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 1650 | * these values may not correspond directly to the zlib compression levels. |
| 1651 | */ |
Glenn Randers-Pehrson | 23d3970 | 2010-12-06 18:28:02 -0600 | [diff] [blame] | 1652 | PNG_EXPORT(69, void, png_set_compression_level, |
| 1653 | (png_structp png_ptr, int level)); |
Guy Schalnat | 51f0eb4 | 1995-09-26 05:22:39 -0500 | [diff] [blame] | 1654 | |
Glenn Randers-Pehrson | c36bb79 | 2011-02-12 09:49:07 -0600 | [diff] [blame] | 1655 | PNG_EXPORT(70, void, png_set_compression_mem_level, (png_structp png_ptr, |
Glenn Randers-Pehrson | 23d3970 | 2010-12-06 18:28:02 -0600 | [diff] [blame] | 1656 | int mem_level)); |
Guy Schalnat | 51f0eb4 | 1995-09-26 05:22:39 -0500 | [diff] [blame] | 1657 | |
Glenn Randers-Pehrson | c36bb79 | 2011-02-12 09:49:07 -0600 | [diff] [blame] | 1658 | PNG_EXPORT(71, void, png_set_compression_strategy, (png_structp png_ptr, |
Glenn Randers-Pehrson | 23d3970 | 2010-12-06 18:28:02 -0600 | [diff] [blame] | 1659 | int strategy)); |
Guy Schalnat | 51f0eb4 | 1995-09-26 05:22:39 -0500 | [diff] [blame] | 1660 | |
Glenn Randers-Pehrson | af855e4 | 2011-05-07 10:52:49 -0500 | [diff] [blame] | 1661 | /* If PNG_WRITE_OPTIMIZE_CMF_SUPPORTED is defined, libpng will use a |
| 1662 | * smaller value of window_bits if it can do so safely. |
| 1663 | */ |
Glenn Randers-Pehrson | c36bb79 | 2011-02-12 09:49:07 -0600 | [diff] [blame] | 1664 | PNG_EXPORT(72, void, png_set_compression_window_bits, (png_structp png_ptr, |
Glenn Randers-Pehrson | 23d3970 | 2010-12-06 18:28:02 -0600 | [diff] [blame] | 1665 | int window_bits)); |
Guy Schalnat | 51f0eb4 | 1995-09-26 05:22:39 -0500 | [diff] [blame] | 1666 | |
Glenn Randers-Pehrson | 23d3970 | 2010-12-06 18:28:02 -0600 | [diff] [blame] | 1667 | PNG_EXPORT(73, void, png_set_compression_method, (png_structp png_ptr, |
| 1668 | int method)); |
John Bowler | c5bef94 | 2011-05-05 17:35:39 -0500 | [diff] [blame] | 1669 | #endif |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 1670 | |
John Bowler | b2bee33 | 2011-06-10 23:24:58 -0500 | [diff] [blame] | 1671 | #ifdef PNG_WRITE_CUSTOMIZE_ZTXT_COMPRESSION_SUPPORTED |
Glenn Randers-Pehrson | 6b3d50b | 2011-03-31 20:14:29 -0500 | [diff] [blame] | 1672 | /* Also set zlib parameters for compressing non-IDAT chunks */ |
| 1673 | PNG_EXPORT(222, void, png_set_text_compression_level, |
| 1674 | (png_structp png_ptr, int level)); |
| 1675 | |
| 1676 | PNG_EXPORT(223, void, png_set_text_compression_mem_level, (png_structp png_ptr, |
| 1677 | int mem_level)); |
| 1678 | |
| 1679 | PNG_EXPORT(224, void, png_set_text_compression_strategy, (png_structp png_ptr, |
| 1680 | int strategy)); |
| 1681 | |
Glenn Randers-Pehrson | af855e4 | 2011-05-07 10:52:49 -0500 | [diff] [blame] | 1682 | /* If PNG_WRITE_OPTIMIZE_CMF_SUPPORTED is defined, libpng will use a |
| 1683 | * smaller value of window_bits if it can do so safely. |
| 1684 | */ |
Glenn Randers-Pehrson | 6b3d50b | 2011-03-31 20:14:29 -0500 | [diff] [blame] | 1685 | PNG_EXPORT(225, void, png_set_text_compression_window_bits, (png_structp |
| 1686 | png_ptr, int window_bits)); |
| 1687 | |
| 1688 | PNG_EXPORT(226, void, png_set_text_compression_method, (png_structp png_ptr, |
| 1689 | int method)); |
John Bowler | b2bee33 | 2011-06-10 23:24:58 -0500 | [diff] [blame] | 1690 | #endif /* PNG_WRITE_CUSTOMIZE_ZTXT_COMPRESSION_SUPPORTED */ |
Glenn Randers-Pehrson | 6b3d50b | 2011-03-31 20:14:29 -0500 | [diff] [blame] | 1691 | |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 1692 | /* These next functions are called for input/output, memory, and error |
Glenn Randers-Pehrson | c36bb79 | 2011-02-12 09:49:07 -0600 | [diff] [blame] | 1693 | * 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] | 1694 | * and call standard C I/O routines such as fread(), fwrite(), and |
| 1695 | * fprintf(). These functions can be made to use other I/O routines |
| 1696 | * 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] | 1697 | * different manner by calling png_set_???_fn(). See libpng-manual.txt for |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 1698 | * more information. |
| 1699 | */ |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 1700 | |
Glenn Randers-Pehrson | dbd4014 | 2009-08-31 08:42:02 -0500 | [diff] [blame] | 1701 | #ifdef PNG_STDIO_SUPPORTED |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 1702 | /* Initialize the input/output for the PNG file to the default functions. */ |
Glenn Randers-Pehrson | 23d3970 | 2010-12-06 18:28:02 -0600 | [diff] [blame] | 1703 | PNG_EXPORT(74, void, png_init_io, (png_structp png_ptr, png_FILE_p fp)); |
Glenn Randers-Pehrson | 70e3f54 | 1998-01-03 22:40:55 -0600 | [diff] [blame] | 1704 | #endif |
Guy Schalnat | 6d76471 | 1995-12-19 03:22:19 -0600 | [diff] [blame] | 1705 | |
Andreas Dilger | 02ad0ef | 1997-01-17 01:34:35 -0600 | [diff] [blame] | 1706 | /* Replace the (error and abort), and warning functions with user |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 1707 | * supplied functions. If no messages are to be printed you must still |
| 1708 | * write and use replacement functions. The replacement error_fn should |
| 1709 | * still do a longjmp to the last setjmp location if you are using this |
| 1710 | * method of error handling. If error_fn or warning_fn is NULL, the |
| 1711 | * default function will be used. |
| 1712 | */ |
Glenn Randers-Pehrson | 5c6aeb2 | 1998-12-29 11:47:59 -0600 | [diff] [blame] | 1713 | |
Glenn Randers-Pehrson | 23d3970 | 2010-12-06 18:28:02 -0600 | [diff] [blame] | 1714 | PNG_EXPORT(75, void, png_set_error_fn, |
Glenn Randers-Pehrson | c36bb79 | 2011-02-12 09:49:07 -0600 | [diff] [blame] | 1715 | (png_structp png_ptr, png_voidp error_ptr, |
Glenn Randers-Pehrson | 23d3970 | 2010-12-06 18:28:02 -0600 | [diff] [blame] | 1716 | png_error_ptr error_fn, png_error_ptr warning_fn)); |
Guy Schalnat | 6d76471 | 1995-12-19 03:22:19 -0600 | [diff] [blame] | 1717 | |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 1718 | /* Return the user pointer associated with the error functions */ |
John Bowler | 0a5c9c0 | 2011-01-22 17:36:34 -0600 | [diff] [blame] | 1719 | PNG_EXPORT(76, png_voidp, png_get_error_ptr, (png_const_structp png_ptr)); |
Guy Schalnat | 6d76471 | 1995-12-19 03:22:19 -0600 | [diff] [blame] | 1720 | |
| 1721 | /* Replace the default data output functions with a user supplied one(s). |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 1722 | * If buffered output is not used, then output_flush_fn can be set to NULL. |
| 1723 | * If PNG_WRITE_FLUSH_SUPPORTED is not defined at libpng compile time |
| 1724 | * output_flush_fn will be ignored (and thus can be NULL). |
Glenn Randers-Pehrson | 8fb550c | 2009-03-21 08:15:32 -0500 | [diff] [blame] | 1725 | * It is probably a mistake to use NULL for output_flush_fn if |
| 1726 | * write_data_fn is not also NULL unless you have built libpng with |
| 1727 | * PNG_WRITE_FLUSH_SUPPORTED undefined, because in this case libpng's |
| 1728 | * default flush function, which uses the standard *FILE structure, will |
| 1729 | * be used. |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 1730 | */ |
Glenn Randers-Pehrson | c36bb79 | 2011-02-12 09:49:07 -0600 | [diff] [blame] | 1731 | PNG_EXPORT(77, void, png_set_write_fn, (png_structp png_ptr, png_voidp io_ptr, |
Glenn Randers-Pehrson | 23d3970 | 2010-12-06 18:28:02 -0600 | [diff] [blame] | 1732 | png_rw_ptr write_data_fn, png_flush_ptr output_flush_fn)); |
Guy Schalnat | 6d76471 | 1995-12-19 03:22:19 -0600 | [diff] [blame] | 1733 | |
| 1734 | /* Replace the default data input function with a user supplied one. */ |
Glenn Randers-Pehrson | c36bb79 | 2011-02-12 09:49:07 -0600 | [diff] [blame] | 1735 | PNG_EXPORT(78, void, png_set_read_fn, (png_structp png_ptr, png_voidp io_ptr, |
Glenn Randers-Pehrson | 23d3970 | 2010-12-06 18:28:02 -0600 | [diff] [blame] | 1736 | png_rw_ptr read_data_fn)); |
Guy Schalnat | 6d76471 | 1995-12-19 03:22:19 -0600 | [diff] [blame] | 1737 | |
| 1738 | /* Return the user pointer associated with the I/O functions */ |
Glenn Randers-Pehrson | 23d3970 | 2010-12-06 18:28:02 -0600 | [diff] [blame] | 1739 | PNG_EXPORT(79, png_voidp, png_get_io_ptr, (png_structp png_ptr)); |
Guy Schalnat | 6d76471 | 1995-12-19 03:22:19 -0600 | [diff] [blame] | 1740 | |
Glenn Randers-Pehrson | c36bb79 | 2011-02-12 09:49:07 -0600 | [diff] [blame] | 1741 | PNG_EXPORT(80, void, png_set_read_status_fn, (png_structp png_ptr, |
Glenn Randers-Pehrson | 23d3970 | 2010-12-06 18:28:02 -0600 | [diff] [blame] | 1742 | png_read_status_ptr read_row_fn)); |
Glenn Randers-Pehrson | 08a3343 | 1998-03-07 06:06:55 -0600 | [diff] [blame] | 1743 | |
Glenn Randers-Pehrson | c36bb79 | 2011-02-12 09:49:07 -0600 | [diff] [blame] | 1744 | PNG_EXPORT(81, void, png_set_write_status_fn, (png_structp png_ptr, |
Glenn Randers-Pehrson | 23d3970 | 2010-12-06 18:28:02 -0600 | [diff] [blame] | 1745 | png_write_status_ptr write_row_fn)); |
Glenn Randers-Pehrson | 08a3343 | 1998-03-07 06:06:55 -0600 | [diff] [blame] | 1746 | |
Glenn Randers-Pehrson | f7d1a17 | 1998-06-06 15:31:35 -0500 | [diff] [blame] | 1747 | #ifdef PNG_USER_MEM_SUPPORTED |
| 1748 | /* Replace the default memory allocation functions with user supplied one(s). */ |
Glenn Randers-Pehrson | c36bb79 | 2011-02-12 09:49:07 -0600 | [diff] [blame] | 1749 | PNG_EXPORT(82, void, png_set_mem_fn, (png_structp png_ptr, png_voidp mem_ptr, |
Glenn Randers-Pehrson | 23d3970 | 2010-12-06 18:28:02 -0600 | [diff] [blame] | 1750 | png_malloc_ptr malloc_fn, png_free_ptr free_fn)); |
Glenn Randers-Pehrson | f7d1a17 | 1998-06-06 15:31:35 -0500 | [diff] [blame] | 1751 | /* Return the user pointer associated with the memory functions */ |
John Bowler | 0a5c9c0 | 2011-01-22 17:36:34 -0600 | [diff] [blame] | 1752 | PNG_EXPORT(83, png_voidp, png_get_mem_ptr, (png_const_structp png_ptr)); |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame] | 1753 | #endif |
Glenn Randers-Pehrson | f7d1a17 | 1998-06-06 15:31:35 -0500 | [diff] [blame] | 1754 | |
Glenn Randers-Pehrson | 33188ac | 2009-06-16 14:12:35 -0500 | [diff] [blame] | 1755 | #ifdef PNG_READ_USER_TRANSFORM_SUPPORTED |
Glenn Randers-Pehrson | c36bb79 | 2011-02-12 09:49:07 -0600 | [diff] [blame] | 1756 | PNG_EXPORT(84, void, png_set_read_user_transform_fn, (png_structp png_ptr, |
Glenn Randers-Pehrson | 23d3970 | 2010-12-06 18:28:02 -0600 | [diff] [blame] | 1757 | png_user_transform_ptr read_user_transform_fn)); |
Glenn Randers-Pehrson | 08a3343 | 1998-03-07 06:06:55 -0600 | [diff] [blame] | 1758 | #endif |
| 1759 | |
Glenn Randers-Pehrson | 33188ac | 2009-06-16 14:12:35 -0500 | [diff] [blame] | 1760 | #ifdef PNG_WRITE_USER_TRANSFORM_SUPPORTED |
Glenn Randers-Pehrson | c36bb79 | 2011-02-12 09:49:07 -0600 | [diff] [blame] | 1761 | PNG_EXPORT(85, void, png_set_write_user_transform_fn, (png_structp png_ptr, |
Glenn Randers-Pehrson | 23d3970 | 2010-12-06 18:28:02 -0600 | [diff] [blame] | 1762 | png_user_transform_ptr write_user_transform_fn)); |
Glenn Randers-Pehrson | 08a3343 | 1998-03-07 06:06:55 -0600 | [diff] [blame] | 1763 | #endif |
| 1764 | |
John Bowler | 0a5c9c0 | 2011-01-22 17:36:34 -0600 | [diff] [blame] | 1765 | #ifdef PNG_USER_TRANSFORM_PTR_SUPPORTED |
Glenn Randers-Pehrson | c36bb79 | 2011-02-12 09:49:07 -0600 | [diff] [blame] | 1766 | PNG_EXPORT(86, void, png_set_user_transform_info, (png_structp png_ptr, |
| 1767 | png_voidp user_transform_ptr, int user_transform_depth, |
Glenn Randers-Pehrson | 23d3970 | 2010-12-06 18:28:02 -0600 | [diff] [blame] | 1768 | int user_transform_channels)); |
Glenn Randers-Pehrson | 4393a9a | 1999-09-17 12:27:26 -0500 | [diff] [blame] | 1769 | /* Return the user pointer associated with the user transform functions */ |
Glenn Randers-Pehrson | b86b492 | 2011-01-21 23:12:51 -0600 | [diff] [blame] | 1770 | PNG_EXPORT(87, png_voidp, png_get_user_transform_ptr, |
John Bowler | 0a5c9c0 | 2011-01-22 17:36:34 -0600 | [diff] [blame] | 1771 | (png_const_structp png_ptr)); |
| 1772 | #endif |
| 1773 | |
| 1774 | #ifdef PNG_USER_TRANSFORM_INFO_SUPPORTED |
| 1775 | /* Return information about the row currently being processed. Note that these |
| 1776 | * APIs do not fail but will return unexpected results if called outside a user |
| 1777 | * transform callback. Also note that when transforming an interlaced image the |
John Bowler | 9616ad9 | 2011-02-16 06:13:46 -0600 | [diff] [blame] | 1778 | * row number is the row number within the sub-image of the interlace pass, so |
| 1779 | * the value will increase to the height of the sub-image (not the full image) |
| 1780 | * then reset to 0 for the next pass. |
John Bowler | 5432c01 | 2011-02-12 08:59:17 -0600 | [diff] [blame] | 1781 | * |
John Bowler | 9616ad9 | 2011-02-16 06:13:46 -0600 | [diff] [blame] | 1782 | * Use PNG_ROW_FROM_PASS_ROW(row, pass) and PNG_COL_FROM_PASS_COL(col, pass) to |
| 1783 | * find the output pixel (x,y) given an interlaced sub-image pixel |
| 1784 | * (row,col,pass). (See below for these macros.) |
John Bowler | 0a5c9c0 | 2011-01-22 17:36:34 -0600 | [diff] [blame] | 1785 | */ |
| 1786 | PNG_EXPORT(217, png_uint_32, png_get_current_row_number, (png_const_structp)); |
| 1787 | PNG_EXPORT(218, png_byte, png_get_current_pass_number, (png_const_structp)); |
Glenn Randers-Pehrson | 4393a9a | 1999-09-17 12:27:26 -0500 | [diff] [blame] | 1788 | #endif |
| 1789 | |
Glenn Randers-Pehrson | 1909560 | 2001-03-14 07:08:39 -0600 | [diff] [blame] | 1790 | #ifdef PNG_USER_CHUNKS_SUPPORTED |
Glenn Randers-Pehrson | c36bb79 | 2011-02-12 09:49:07 -0600 | [diff] [blame] | 1791 | PNG_EXPORT(88, void, png_set_read_user_chunk_fn, (png_structp png_ptr, |
Glenn Randers-Pehrson | 23d3970 | 2010-12-06 18:28:02 -0600 | [diff] [blame] | 1792 | png_voidp user_chunk_ptr, png_user_chunk_ptr read_user_chunk_fn)); |
John Bowler | 0a5c9c0 | 2011-01-22 17:36:34 -0600 | [diff] [blame] | 1793 | PNG_EXPORT(89, png_voidp, png_get_user_chunk_ptr, (png_const_structp png_ptr)); |
Glenn Randers-Pehrson | 61c32d9 | 2000-02-04 23:40:16 -0600 | [diff] [blame] | 1794 | #endif |
| 1795 | |
Guy Schalnat | 4ee97b0 | 1996-01-16 01:51:56 -0600 | [diff] [blame] | 1796 | #ifdef PNG_PROGRESSIVE_READ_SUPPORTED |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 1797 | /* Sets the function callbacks for the push reader, and a pointer to a |
| 1798 | * user-defined structure available to the callback functions. |
| 1799 | */ |
Glenn Randers-Pehrson | c36bb79 | 2011-02-12 09:49:07 -0600 | [diff] [blame] | 1800 | PNG_EXPORT(90, void, png_set_progressive_read_fn, (png_structp png_ptr, |
| 1801 | png_voidp progressive_ptr, png_progressive_info_ptr info_fn, |
Glenn Randers-Pehrson | 23d3970 | 2010-12-06 18:28:02 -0600 | [diff] [blame] | 1802 | png_progressive_row_ptr row_fn, png_progressive_end_ptr end_fn)); |
Guy Schalnat | 6d76471 | 1995-12-19 03:22:19 -0600 | [diff] [blame] | 1803 | |
Glenn Randers-Pehrson | 6c7a09a | 2009-06-15 21:57:39 -0500 | [diff] [blame] | 1804 | /* Returns the user pointer associated with the push read functions */ |
John Bowler | 0a5c9c0 | 2011-01-22 17:36:34 -0600 | [diff] [blame] | 1805 | PNG_EXPORT(91, png_voidp, png_get_progressive_ptr, (png_const_structp png_ptr)); |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 1806 | |
Glenn Randers-Pehrson | 6c7a09a | 2009-06-15 21:57:39 -0500 | [diff] [blame] | 1807 | /* Function to be called when data becomes available */ |
Glenn Randers-Pehrson | 23d3970 | 2010-12-06 18:28:02 -0600 | [diff] [blame] | 1808 | PNG_EXPORT(92, void, png_process_data, |
Glenn Randers-Pehrson | c36bb79 | 2011-02-12 09:49:07 -0600 | [diff] [blame] | 1809 | (png_structp png_ptr, png_infop info_ptr, |
Glenn Randers-Pehrson | 23d3970 | 2010-12-06 18:28:02 -0600 | [diff] [blame] | 1810 | png_bytep buffer, png_size_t buffer_size)); |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 1811 | |
John Bowler | 0a5c9c0 | 2011-01-22 17:36:34 -0600 | [diff] [blame] | 1812 | /* A function which may be called *only* within png_process_data to stop the |
| 1813 | * processing of any more data. The function returns the number of bytes |
| 1814 | * remaining, excluding any that libpng has cached internally. A subsequent |
| 1815 | * call to png_process_data must supply these bytes again. If the argument |
| 1816 | * 'save' is set to true the routine will first save all the pending data and |
| 1817 | * will always return 0. |
| 1818 | */ |
| 1819 | PNG_EXPORT(219, png_size_t, png_process_data_pause, (png_structp, int save)); |
| 1820 | |
| 1821 | /* A function which may be called *only* outside (after) a call to |
| 1822 | * png_process_data. It returns the number of bytes of data to skip in the |
| 1823 | * input. Normally it will return 0, but if it returns a non-zero value the |
| 1824 | * application must skip than number of bytes of input data and pass the |
| 1825 | * following data to the next call to png_process_data. |
| 1826 | */ |
| 1827 | PNG_EXPORT(220, png_uint_32, png_process_data_skip, (png_structp)); |
| 1828 | |
Glenn Randers-Pehrson | 9f044c1 | 2010-12-07 14:59:43 -0600 | [diff] [blame] | 1829 | /* Function that combines rows. 'new_row' is a flag that should come from |
| 1830 | * the callback and be non-NULL if anything needs to be done; the library |
| 1831 | * stores its own version of the new data internally and ignores the passed |
| 1832 | * in value. |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 1833 | */ |
Glenn Randers-Pehrson | c36bb79 | 2011-02-12 09:49:07 -0600 | [diff] [blame] | 1834 | PNG_EXPORT(93, void, png_progressive_combine_row, (png_structp png_ptr, |
Glenn Randers-Pehrson | 23d3970 | 2010-12-06 18:28:02 -0600 | [diff] [blame] | 1835 | png_bytep old_row, png_const_bytep new_row)); |
Guy Schalnat | 4ee97b0 | 1996-01-16 01:51:56 -0600 | [diff] [blame] | 1836 | #endif /* PNG_PROGRESSIVE_READ_SUPPORTED */ |
Guy Schalnat | 6d76471 | 1995-12-19 03:22:19 -0600 | [diff] [blame] | 1837 | |
Glenn Randers-Pehrson | 23d3970 | 2010-12-06 18:28:02 -0600 | [diff] [blame] | 1838 | PNG_EXPORTA(94, png_voidp, png_malloc, |
Glenn Randers-Pehrson | c36bb79 | 2011-02-12 09:49:07 -0600 | [diff] [blame] | 1839 | (png_structp png_ptr, png_alloc_size_t size), |
Glenn Randers-Pehrson | 23d3970 | 2010-12-06 18:28:02 -0600 | [diff] [blame] | 1840 | PNG_ALLOCATED); |
Glenn Randers-Pehrson | 0ffb71a | 2009-02-28 06:08:20 -0600 | [diff] [blame] | 1841 | /* Added at libpng version 1.4.0 */ |
Glenn Randers-Pehrson | 23d3970 | 2010-12-06 18:28:02 -0600 | [diff] [blame] | 1842 | PNG_EXPORTA(95, png_voidp, png_calloc, |
Glenn Randers-Pehrson | c36bb79 | 2011-02-12 09:49:07 -0600 | [diff] [blame] | 1843 | (png_structp png_ptr, png_alloc_size_t size), |
Glenn Randers-Pehrson | 23d3970 | 2010-12-06 18:28:02 -0600 | [diff] [blame] | 1844 | PNG_ALLOCATED); |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 1845 | |
Glenn Randers-Pehrson | 07748d1 | 2002-05-25 11:12:10 -0500 | [diff] [blame] | 1846 | /* Added at libpng version 1.2.4 */ |
Glenn Randers-Pehrson | c36bb79 | 2011-02-12 09:49:07 -0600 | [diff] [blame] | 1847 | PNG_EXPORTA(96, png_voidp, png_malloc_warn, (png_structp png_ptr, |
Glenn Randers-Pehrson | 23d3970 | 2010-12-06 18:28:02 -0600 | [diff] [blame] | 1848 | png_alloc_size_t size), PNG_ALLOCATED); |
Glenn Randers-Pehrson | 07748d1 | 2002-05-25 11:12:10 -0500 | [diff] [blame] | 1849 | |
Glenn Randers-Pehrson | beb572e | 2006-08-19 13:59:24 -0500 | [diff] [blame] | 1850 | /* Frees a pointer allocated by png_malloc() */ |
Glenn Randers-Pehrson | 23d3970 | 2010-12-06 18:28:02 -0600 | [diff] [blame] | 1851 | PNG_EXPORT(97, void, png_free, (png_structp png_ptr, png_voidp ptr)); |
Guy Schalnat | e5a3779 | 1996-06-05 15:50:50 -0500 | [diff] [blame] | 1852 | |
Glenn Randers-Pehrson | 38e6e77 | 2000-04-09 19:06:13 -0500 | [diff] [blame] | 1853 | /* Free data that was allocated internally */ |
Glenn Randers-Pehrson | 23d3970 | 2010-12-06 18:28:02 -0600 | [diff] [blame] | 1854 | PNG_EXPORT(98, void, png_free_data, |
| 1855 | (png_structp png_ptr, png_infop info_ptr, png_uint_32 free_me, int num)); |
| 1856 | |
Glenn Randers-Pehrson | 38e6e77 | 2000-04-09 19:06:13 -0500 | [diff] [blame] | 1857 | /* Reassign responsibility for freeing existing data, whether allocated |
| 1858 | * by libpng or by the application */ |
Glenn Randers-Pehrson | 23d3970 | 2010-12-06 18:28:02 -0600 | [diff] [blame] | 1859 | PNG_EXPORT(99, void, png_data_freer, |
| 1860 | (png_structp png_ptr, png_infop info_ptr, int freer, png_uint_32 mask)); |
| 1861 | |
Glenn Randers-Pehrson | 6c7a09a | 2009-06-15 21:57:39 -0500 | [diff] [blame] | 1862 | /* Assignments for png_data_freer */ |
Glenn Randers-Pehrson | 38e6e77 | 2000-04-09 19:06:13 -0500 | [diff] [blame] | 1863 | #define PNG_DESTROY_WILL_FREE_DATA 1 |
| 1864 | #define PNG_SET_WILL_FREE_DATA 1 |
| 1865 | #define PNG_USER_WILL_FREE_DATA 2 |
| 1866 | /* Flags for png_ptr->free_me and info_ptr->free_me */ |
Glenn Randers-Pehrson | a77ef62 | 2000-02-18 13:48:52 -0600 | [diff] [blame] | 1867 | #define PNG_FREE_HIST 0x0008 |
| 1868 | #define PNG_FREE_ICCP 0x0010 |
| 1869 | #define PNG_FREE_SPLT 0x0020 |
| 1870 | #define PNG_FREE_ROWS 0x0040 |
Glenn Randers-Pehrson | 1ef65b6 | 2000-05-12 06:19:53 -0500 | [diff] [blame] | 1871 | #define PNG_FREE_PCAL 0x0080 |
| 1872 | #define PNG_FREE_SCAL 0x0100 |
Glenn Randers-Pehrson | a77ef62 | 2000-02-18 13:48:52 -0600 | [diff] [blame] | 1873 | #define PNG_FREE_UNKN 0x0200 |
| 1874 | #define PNG_FREE_LIST 0x0400 |
Glenn Randers-Pehrson | 6942d53 | 2000-05-01 09:31:54 -0500 | [diff] [blame] | 1875 | #define PNG_FREE_PLTE 0x1000 |
| 1876 | #define PNG_FREE_TRNS 0x2000 |
| 1877 | #define PNG_FREE_TEXT 0x4000 |
Glenn Randers-Pehrson | 1ef65b6 | 2000-05-12 06:19:53 -0500 | [diff] [blame] | 1878 | #define PNG_FREE_ALL 0x7fff |
Glenn Randers-Pehrson | ec61c23 | 2000-05-16 06:17:36 -0500 | [diff] [blame] | 1879 | #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] | 1880 | |
Glenn Randers-Pehrson | f7d1a17 | 1998-06-06 15:31:35 -0500 | [diff] [blame] | 1881 | #ifdef PNG_USER_MEM_SUPPORTED |
Glenn Randers-Pehrson | c36bb79 | 2011-02-12 09:49:07 -0600 | [diff] [blame] | 1882 | PNG_EXPORTA(100, png_voidp, png_malloc_default, (png_structp png_ptr, |
Glenn Randers-Pehrson | 23d3970 | 2010-12-06 18:28:02 -0600 | [diff] [blame] | 1883 | png_alloc_size_t size), PNG_ALLOCATED); |
| 1884 | PNG_EXPORT(101, void, png_free_default, (png_structp png_ptr, png_voidp ptr)); |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame] | 1885 | #endif |
Glenn Randers-Pehrson | f7d1a17 | 1998-06-06 15:31:35 -0500 | [diff] [blame] | 1886 | |
Glenn Randers-Pehrson | 862cb20 | 2010-04-16 22:12:51 -0500 | [diff] [blame] | 1887 | #ifdef PNG_ERROR_TEXT_SUPPORTED |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 1888 | /* Fatal error in PNG image of libpng - can't continue */ |
Glenn Randers-Pehrson | 23d3970 | 2010-12-06 18:28:02 -0600 | [diff] [blame] | 1889 | PNG_EXPORTA(102, void, png_error, |
Glenn Randers-Pehrson | c36bb79 | 2011-02-12 09:49:07 -0600 | [diff] [blame] | 1890 | (png_structp png_ptr, png_const_charp error_message), |
Glenn Randers-Pehrson | 23d3970 | 2010-12-06 18:28:02 -0600 | [diff] [blame] | 1891 | PNG_NORETURN); |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 1892 | |
Glenn Randers-Pehrson | 70e3f54 | 1998-01-03 22:40:55 -0600 | [diff] [blame] | 1893 | /* The same, but the chunk name is prepended to the error string. */ |
Glenn Randers-Pehrson | c36bb79 | 2011-02-12 09:49:07 -0600 | [diff] [blame] | 1894 | PNG_EXPORTA(103, void, png_chunk_error, (png_structp png_ptr, |
Glenn Randers-Pehrson | 23d3970 | 2010-12-06 18:28:02 -0600 | [diff] [blame] | 1895 | png_const_charp error_message), PNG_NORETURN); |
Glenn Randers-Pehrson | 70e3f54 | 1998-01-03 22:40:55 -0600 | [diff] [blame] | 1896 | |
Glenn Randers-Pehrson | fd10753 | 2009-11-10 05:59:22 -0600 | [diff] [blame] | 1897 | #else |
| 1898 | /* Fatal error in PNG image of libpng - can't continue */ |
Glenn Randers-Pehrson | 23d3970 | 2010-12-06 18:28:02 -0600 | [diff] [blame] | 1899 | PNG_EXPORTA(104, void, png_err, (png_structp png_ptr), PNG_NORETURN); |
Glenn Randers-Pehrson | fd10753 | 2009-11-10 05:59:22 -0600 | [diff] [blame] | 1900 | #endif |
| 1901 | |
John Bowler | 88b77cc | 2011-05-05 06:49:55 -0500 | [diff] [blame] | 1902 | #ifdef PNG_WARNINGS_SUPPORTED |
Guy Schalnat | 6d76471 | 1995-12-19 03:22:19 -0600 | [diff] [blame] | 1903 | /* Non-fatal error in libpng. Can continue, but may have a problem. */ |
Glenn Randers-Pehrson | c36bb79 | 2011-02-12 09:49:07 -0600 | [diff] [blame] | 1904 | PNG_EXPORT(105, void, png_warning, (png_structp png_ptr, |
Glenn Randers-Pehrson | 23d3970 | 2010-12-06 18:28:02 -0600 | [diff] [blame] | 1905 | png_const_charp warning_message)); |
Guy Schalnat | 0d58058 | 1995-07-20 02:43:20 -0500 | [diff] [blame] | 1906 | |
Glenn Randers-Pehrson | 70e3f54 | 1998-01-03 22:40:55 -0600 | [diff] [blame] | 1907 | /* Non-fatal error in libpng, chunk name is prepended to message. */ |
Glenn Randers-Pehrson | c36bb79 | 2011-02-12 09:49:07 -0600 | [diff] [blame] | 1908 | PNG_EXPORT(106, void, png_chunk_warning, (png_structp png_ptr, |
Glenn Randers-Pehrson | 23d3970 | 2010-12-06 18:28:02 -0600 | [diff] [blame] | 1909 | png_const_charp warning_message)); |
John Bowler | 88b77cc | 2011-05-05 06:49:55 -0500 | [diff] [blame] | 1910 | #endif |
Glenn Randers-Pehrson | 70e3f54 | 1998-01-03 22:40:55 -0600 | [diff] [blame] | 1911 | |
Glenn Randers-Pehrson | 6bc53be | 2006-06-16 07:52:03 -0500 | [diff] [blame] | 1912 | #ifdef PNG_BENIGN_ERRORS_SUPPORTED |
| 1913 | /* Benign error in libpng. Can continue, but may have a problem. |
| 1914 | * User can choose whether to handle as a fatal error or as a warning. */ |
Glenn Randers-Pehrson | 862cb20 | 2010-04-16 22:12:51 -0500 | [diff] [blame] | 1915 | # undef png_benign_error |
Glenn Randers-Pehrson | c36bb79 | 2011-02-12 09:49:07 -0600 | [diff] [blame] | 1916 | PNG_EXPORT(107, void, png_benign_error, (png_structp png_ptr, |
Glenn Randers-Pehrson | 23d3970 | 2010-12-06 18:28:02 -0600 | [diff] [blame] | 1917 | png_const_charp warning_message)); |
Glenn Randers-Pehrson | 6bc53be | 2006-06-16 07:52:03 -0500 | [diff] [blame] | 1918 | |
| 1919 | /* Same, chunk name is prepended to message. */ |
Glenn Randers-Pehrson | 862cb20 | 2010-04-16 22:12:51 -0500 | [diff] [blame] | 1920 | # undef png_chunk_benign_error |
Glenn Randers-Pehrson | c36bb79 | 2011-02-12 09:49:07 -0600 | [diff] [blame] | 1921 | PNG_EXPORT(108, void, png_chunk_benign_error, (png_structp png_ptr, |
Glenn Randers-Pehrson | 23d3970 | 2010-12-06 18:28:02 -0600 | [diff] [blame] | 1922 | png_const_charp warning_message)); |
Glenn Randers-Pehrson | 6bc53be | 2006-06-16 07:52:03 -0500 | [diff] [blame] | 1923 | |
Glenn Randers-Pehrson | 23d3970 | 2010-12-06 18:28:02 -0600 | [diff] [blame] | 1924 | PNG_EXPORT(109, void, png_set_benign_errors, |
| 1925 | (png_structp png_ptr, int allowed)); |
Glenn Randers-Pehrson | 862cb20 | 2010-04-16 22:12:51 -0500 | [diff] [blame] | 1926 | #else |
| 1927 | # ifdef PNG_ALLOW_BENIGN_ERRORS |
| 1928 | # define png_benign_error png_warning |
| 1929 | # define png_chunk_benign_error png_chunk_warning |
| 1930 | # else |
| 1931 | # define png_benign_error png_error |
| 1932 | # define png_chunk_benign_error png_chunk_error |
| 1933 | # endif |
Glenn Randers-Pehrson | 6bc53be | 2006-06-16 07:52:03 -0500 | [diff] [blame] | 1934 | #endif |
| 1935 | |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 1936 | /* The png_set_<chunk> functions are for storing values in the png_info_struct. |
| 1937 | * Similarly, the png_get_<chunk> calls are used to read values from the |
| 1938 | * png_info_struct, either storing the parameters in the passed variables, or |
| 1939 | * setting pointers into the png_info_struct where the data is stored. The |
| 1940 | * png_get_<chunk> functions return a non-zero value if the data was available |
| 1941 | * in info_ptr, or return zero and do not change any of the parameters if the |
| 1942 | * data was not available. |
| 1943 | * |
| 1944 | * These functions should be used instead of directly accessing png_info |
| 1945 | * to avoid problems with future changes in the size and internal layout of |
| 1946 | * png_info_struct. |
| 1947 | */ |
Glenn Randers-Pehrson | 46f61e2 | 1998-01-30 21:45:12 -0600 | [diff] [blame] | 1948 | /* Returns "flag" if chunk data is valid in info_ptr. */ |
Glenn Randers-Pehrson | 23d3970 | 2010-12-06 18:28:02 -0600 | [diff] [blame] | 1949 | PNG_EXPORT(110, png_uint_32, png_get_valid, |
Glenn Randers-Pehrson | c36bb79 | 2011-02-12 09:49:07 -0600 | [diff] [blame] | 1950 | (png_const_structp png_ptr, png_const_infop info_ptr, |
Glenn Randers-Pehrson | 23d3970 | 2010-12-06 18:28:02 -0600 | [diff] [blame] | 1951 | png_uint_32 flag)); |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 1952 | |
Glenn Randers-Pehrson | 46f61e2 | 1998-01-30 21:45:12 -0600 | [diff] [blame] | 1953 | /* Returns number of bytes needed to hold a transformed row. */ |
Glenn Randers-Pehrson | c36bb79 | 2011-02-12 09:49:07 -0600 | [diff] [blame] | 1954 | PNG_EXPORT(111, png_size_t, png_get_rowbytes, (png_const_structp png_ptr, |
John Bowler | 0a5c9c0 | 2011-01-22 17:36:34 -0600 | [diff] [blame] | 1955 | png_const_infop info_ptr)); |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 1956 | |
Glenn Randers-Pehrson | 4e6b5e9 | 2009-09-23 10:24:53 -0500 | [diff] [blame] | 1957 | #ifdef PNG_INFO_IMAGE_SUPPORTED |
Glenn Randers-Pehrson | a77ef62 | 2000-02-18 13:48:52 -0600 | [diff] [blame] | 1958 | /* 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] | 1959 | * returned from png_read_png(). |
| 1960 | */ |
Glenn Randers-Pehrson | 23d3970 | 2010-12-06 18:28:02 -0600 | [diff] [blame] | 1961 | PNG_EXPORT(112, png_bytepp, png_get_rows, |
John Bowler | 0a5c9c0 | 2011-01-22 17:36:34 -0600 | [diff] [blame] | 1962 | (png_const_structp png_ptr, png_const_infop info_ptr)); |
Glenn Randers-Pehrson | a77ef62 | 2000-02-18 13:48:52 -0600 | [diff] [blame] | 1963 | /* 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] | 1964 | * by png_write_png(). |
| 1965 | */ |
Glenn Randers-Pehrson | b86b492 | 2011-01-21 23:12:51 -0600 | [diff] [blame] | 1966 | PNG_EXPORT(113, void, png_set_rows, (png_structp png_ptr, |
| 1967 | png_infop info_ptr, png_bytepp row_pointers)); |
Glenn Randers-Pehrson | a77ef62 | 2000-02-18 13:48:52 -0600 | [diff] [blame] | 1968 | #endif |
| 1969 | |
Glenn Randers-Pehrson | 46f61e2 | 1998-01-30 21:45:12 -0600 | [diff] [blame] | 1970 | /* Returns number of color channels in image. */ |
Glenn Randers-Pehrson | 23d3970 | 2010-12-06 18:28:02 -0600 | [diff] [blame] | 1971 | PNG_EXPORT(114, png_byte, png_get_channels, |
John Bowler | 0a5c9c0 | 2011-01-22 17:36:34 -0600 | [diff] [blame] | 1972 | (png_const_structp png_ptr, png_const_infop info_ptr)); |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 1973 | |
Glenn Randers-Pehrson | 46f61e2 | 1998-01-30 21:45:12 -0600 | [diff] [blame] | 1974 | #ifdef PNG_EASY_ACCESS_SUPPORTED |
| 1975 | /* Returns image width in pixels. */ |
Glenn Randers-Pehrson | c36bb79 | 2011-02-12 09:49:07 -0600 | [diff] [blame] | 1976 | PNG_EXPORT(115, png_uint_32, png_get_image_width, (png_const_structp png_ptr, |
John Bowler | 0a5c9c0 | 2011-01-22 17:36:34 -0600 | [diff] [blame] | 1977 | png_const_infop info_ptr)); |
Glenn Randers-Pehrson | 46f61e2 | 1998-01-30 21:45:12 -0600 | [diff] [blame] | 1978 | |
| 1979 | /* Returns image height in pixels. */ |
Glenn Randers-Pehrson | c36bb79 | 2011-02-12 09:49:07 -0600 | [diff] [blame] | 1980 | PNG_EXPORT(116, png_uint_32, png_get_image_height, (png_const_structp png_ptr, |
John Bowler | 0a5c9c0 | 2011-01-22 17:36:34 -0600 | [diff] [blame] | 1981 | png_const_infop info_ptr)); |
Glenn Randers-Pehrson | 46f61e2 | 1998-01-30 21:45:12 -0600 | [diff] [blame] | 1982 | |
| 1983 | /* Returns image bit_depth. */ |
Glenn Randers-Pehrson | 23d3970 | 2010-12-06 18:28:02 -0600 | [diff] [blame] | 1984 | PNG_EXPORT(117, png_byte, png_get_bit_depth, |
John Bowler | 0a5c9c0 | 2011-01-22 17:36:34 -0600 | [diff] [blame] | 1985 | (png_const_structp png_ptr, png_const_infop info_ptr)); |
Glenn Randers-Pehrson | 46f61e2 | 1998-01-30 21:45:12 -0600 | [diff] [blame] | 1986 | |
| 1987 | /* Returns image color_type. */ |
Glenn Randers-Pehrson | c36bb79 | 2011-02-12 09:49:07 -0600 | [diff] [blame] | 1988 | PNG_EXPORT(118, png_byte, png_get_color_type, (png_const_structp png_ptr, |
John Bowler | 0a5c9c0 | 2011-01-22 17:36:34 -0600 | [diff] [blame] | 1989 | png_const_infop info_ptr)); |
Glenn Randers-Pehrson | 46f61e2 | 1998-01-30 21:45:12 -0600 | [diff] [blame] | 1990 | |
| 1991 | /* Returns image filter_type. */ |
Glenn Randers-Pehrson | c36bb79 | 2011-02-12 09:49:07 -0600 | [diff] [blame] | 1992 | PNG_EXPORT(119, png_byte, png_get_filter_type, (png_const_structp png_ptr, |
John Bowler | 0a5c9c0 | 2011-01-22 17:36:34 -0600 | [diff] [blame] | 1993 | png_const_infop info_ptr)); |
Glenn Randers-Pehrson | 46f61e2 | 1998-01-30 21:45:12 -0600 | [diff] [blame] | 1994 | |
| 1995 | /* Returns image interlace_type. */ |
Glenn Randers-Pehrson | c36bb79 | 2011-02-12 09:49:07 -0600 | [diff] [blame] | 1996 | PNG_EXPORT(120, png_byte, png_get_interlace_type, (png_const_structp png_ptr, |
John Bowler | 0a5c9c0 | 2011-01-22 17:36:34 -0600 | [diff] [blame] | 1997 | png_const_infop info_ptr)); |
Glenn Randers-Pehrson | 46f61e2 | 1998-01-30 21:45:12 -0600 | [diff] [blame] | 1998 | |
| 1999 | /* Returns image compression_type. */ |
Glenn Randers-Pehrson | c36bb79 | 2011-02-12 09:49:07 -0600 | [diff] [blame] | 2000 | PNG_EXPORT(121, png_byte, png_get_compression_type, (png_const_structp png_ptr, |
John Bowler | 0a5c9c0 | 2011-01-22 17:36:34 -0600 | [diff] [blame] | 2001 | png_const_infop info_ptr)); |
Glenn Randers-Pehrson | 46f61e2 | 1998-01-30 21:45:12 -0600 | [diff] [blame] | 2002 | |
| 2003 | /* Returns image resolution in pixels per meter, from pHYs chunk data. */ |
Glenn Randers-Pehrson | b86b492 | 2011-01-21 23:12:51 -0600 | [diff] [blame] | 2004 | PNG_EXPORT(122, png_uint_32, png_get_pixels_per_meter, |
John Bowler | 0a5c9c0 | 2011-01-22 17:36:34 -0600 | [diff] [blame] | 2005 | (png_const_structp png_ptr, png_const_infop info_ptr)); |
Glenn Randers-Pehrson | b86b492 | 2011-01-21 23:12:51 -0600 | [diff] [blame] | 2006 | PNG_EXPORT(123, png_uint_32, png_get_x_pixels_per_meter, |
John Bowler | 0a5c9c0 | 2011-01-22 17:36:34 -0600 | [diff] [blame] | 2007 | (png_const_structp png_ptr, png_const_infop info_ptr)); |
Glenn Randers-Pehrson | b86b492 | 2011-01-21 23:12:51 -0600 | [diff] [blame] | 2008 | PNG_EXPORT(124, png_uint_32, png_get_y_pixels_per_meter, |
John Bowler | 0a5c9c0 | 2011-01-22 17:36:34 -0600 | [diff] [blame] | 2009 | (png_const_structp png_ptr, png_const_infop info_ptr)); |
Glenn Randers-Pehrson | 46f61e2 | 1998-01-30 21:45:12 -0600 | [diff] [blame] | 2010 | |
| 2011 | /* Returns pixel aspect ratio, computed from pHYs chunk data. */ |
Glenn Randers-Pehrson | b86b492 | 2011-01-21 23:12:51 -0600 | [diff] [blame] | 2012 | PNG_FP_EXPORT(125, float, png_get_pixel_aspect_ratio, |
John Bowler | 0a5c9c0 | 2011-01-22 17:36:34 -0600 | [diff] [blame] | 2013 | (png_const_structp png_ptr, png_const_infop info_ptr)); |
Glenn Randers-Pehrson | c36bb79 | 2011-02-12 09:49:07 -0600 | [diff] [blame] | 2014 | PNG_FIXED_EXPORT(210, png_fixed_point, png_get_pixel_aspect_ratio_fixed, |
John Bowler | 0a5c9c0 | 2011-01-22 17:36:34 -0600 | [diff] [blame] | 2015 | (png_const_structp png_ptr, png_const_infop info_ptr)); |
Glenn Randers-Pehrson | 46f61e2 | 1998-01-30 21:45:12 -0600 | [diff] [blame] | 2016 | |
| 2017 | /* Returns image x, y offset in pixels or microns, from oFFs chunk data. */ |
Glenn Randers-Pehrson | b86b492 | 2011-01-21 23:12:51 -0600 | [diff] [blame] | 2018 | PNG_EXPORT(126, png_int_32, png_get_x_offset_pixels, |
John Bowler | 0a5c9c0 | 2011-01-22 17:36:34 -0600 | [diff] [blame] | 2019 | (png_const_structp png_ptr, png_const_infop info_ptr)); |
Glenn Randers-Pehrson | b86b492 | 2011-01-21 23:12:51 -0600 | [diff] [blame] | 2020 | PNG_EXPORT(127, png_int_32, png_get_y_offset_pixels, |
John Bowler | 0a5c9c0 | 2011-01-22 17:36:34 -0600 | [diff] [blame] | 2021 | (png_const_structp png_ptr, png_const_infop info_ptr)); |
Glenn Randers-Pehrson | b86b492 | 2011-01-21 23:12:51 -0600 | [diff] [blame] | 2022 | PNG_EXPORT(128, png_int_32, png_get_x_offset_microns, |
John Bowler | 0a5c9c0 | 2011-01-22 17:36:34 -0600 | [diff] [blame] | 2023 | (png_const_structp png_ptr, png_const_infop info_ptr)); |
Glenn Randers-Pehrson | b86b492 | 2011-01-21 23:12:51 -0600 | [diff] [blame] | 2024 | PNG_EXPORT(129, png_int_32, png_get_y_offset_microns, |
John Bowler | 0a5c9c0 | 2011-01-22 17:36:34 -0600 | [diff] [blame] | 2025 | (png_const_structp png_ptr, png_const_infop info_ptr)); |
Glenn Randers-Pehrson | 46f61e2 | 1998-01-30 21:45:12 -0600 | [diff] [blame] | 2026 | |
| 2027 | #endif /* PNG_EASY_ACCESS_SUPPORTED */ |
| 2028 | |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 2029 | /* Returns pointer to signature string read from PNG header */ |
Glenn Randers-Pehrson | b86b492 | 2011-01-21 23:12:51 -0600 | [diff] [blame] | 2030 | PNG_EXPORT(130, png_const_bytep, png_get_signature, |
John Bowler | 0a5c9c0 | 2011-01-22 17:36:34 -0600 | [diff] [blame] | 2031 | (png_const_structp png_ptr, png_infop info_ptr)); |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 2032 | |
Glenn Randers-Pehrson | 4e6b5e9 | 2009-09-23 10:24:53 -0500 | [diff] [blame] | 2033 | #ifdef PNG_bKGD_SUPPORTED |
Glenn Randers-Pehrson | 23d3970 | 2010-12-06 18:28:02 -0600 | [diff] [blame] | 2034 | PNG_EXPORT(131, png_uint_32, png_get_bKGD, |
Glenn Randers-Pehrson | c36bb79 | 2011-02-12 09:49:07 -0600 | [diff] [blame] | 2035 | (png_const_structp png_ptr, png_infop info_ptr, |
Glenn Randers-Pehrson | 23d3970 | 2010-12-06 18:28:02 -0600 | [diff] [blame] | 2036 | png_color_16p *background)); |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame] | 2037 | #endif |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 2038 | |
Glenn Randers-Pehrson | 4e6b5e9 | 2009-09-23 10:24:53 -0500 | [diff] [blame] | 2039 | #ifdef PNG_bKGD_SUPPORTED |
Glenn Randers-Pehrson | c36bb79 | 2011-02-12 09:49:07 -0600 | [diff] [blame] | 2040 | PNG_EXPORT(132, void, png_set_bKGD, (png_structp png_ptr, png_infop info_ptr, |
Glenn Randers-Pehrson | 23d3970 | 2010-12-06 18:28:02 -0600 | [diff] [blame] | 2041 | png_const_color_16p background)); |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame] | 2042 | #endif |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 2043 | |
Glenn Randers-Pehrson | 4e6b5e9 | 2009-09-23 10:24:53 -0500 | [diff] [blame] | 2044 | #ifdef PNG_cHRM_SUPPORTED |
Glenn Randers-Pehrson | c36bb79 | 2011-02-12 09:49:07 -0600 | [diff] [blame] | 2045 | PNG_FP_EXPORT(133, png_uint_32, png_get_cHRM, (png_const_structp png_ptr, |
| 2046 | png_const_infop info_ptr, double *white_x, double *white_y, double *red_x, |
| 2047 | double *red_y, double *green_x, double *green_y, double *blue_x, |
Glenn Randers-Pehrson | 23d3970 | 2010-12-06 18:28:02 -0600 | [diff] [blame] | 2048 | double *blue_y)); |
Glenn Randers-Pehrson | 31aee0d | 2010-07-29 17:39:14 -0500 | [diff] [blame] | 2049 | #ifdef PNG_FIXED_POINT_SUPPORTED /* Otherwise not implemented */ |
Glenn Randers-Pehrson | b86b492 | 2011-01-21 23:12:51 -0600 | [diff] [blame] | 2050 | PNG_FIXED_EXPORT(134, png_uint_32, png_get_cHRM_fixed, |
Glenn Randers-Pehrson | c36bb79 | 2011-02-12 09:49:07 -0600 | [diff] [blame] | 2051 | (png_const_structp png_ptr, |
| 2052 | png_const_infop info_ptr, png_fixed_point *int_white_x, |
| 2053 | png_fixed_point *int_white_y, png_fixed_point *int_red_x, |
| 2054 | png_fixed_point *int_red_y, png_fixed_point *int_green_x, |
| 2055 | png_fixed_point *int_green_y, png_fixed_point *int_blue_x, |
Glenn Randers-Pehrson | 23d3970 | 2010-12-06 18:28:02 -0600 | [diff] [blame] | 2056 | png_fixed_point *int_blue_y)); |
Glenn Randers-Pehrson | 31aee0d | 2010-07-29 17:39:14 -0500 | [diff] [blame] | 2057 | #endif |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame] | 2058 | #endif |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 2059 | |
Glenn Randers-Pehrson | 4e6b5e9 | 2009-09-23 10:24:53 -0500 | [diff] [blame] | 2060 | #ifdef PNG_cHRM_SUPPORTED |
Glenn Randers-Pehrson | 23d3970 | 2010-12-06 18:28:02 -0600 | [diff] [blame] | 2061 | PNG_FP_EXPORT(135, void, png_set_cHRM, |
Glenn Randers-Pehrson | c36bb79 | 2011-02-12 09:49:07 -0600 | [diff] [blame] | 2062 | (png_structp png_ptr, png_infop info_ptr, |
| 2063 | double white_x, double white_y, double red_x, double red_y, double green_x, |
Glenn Randers-Pehrson | 23d3970 | 2010-12-06 18:28:02 -0600 | [diff] [blame] | 2064 | double green_y, double blue_x, double blue_y)); |
Glenn Randers-Pehrson | c36bb79 | 2011-02-12 09:49:07 -0600 | [diff] [blame] | 2065 | PNG_FIXED_EXPORT(136, void, png_set_cHRM_fixed, (png_structp png_ptr, |
| 2066 | png_infop info_ptr, png_fixed_point int_white_x, |
| 2067 | png_fixed_point int_white_y, png_fixed_point int_red_x, |
| 2068 | png_fixed_point int_red_y, png_fixed_point int_green_x, |
| 2069 | png_fixed_point int_green_y, png_fixed_point int_blue_x, |
Glenn Randers-Pehrson | 23d3970 | 2010-12-06 18:28:02 -0600 | [diff] [blame] | 2070 | png_fixed_point int_blue_y)); |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame] | 2071 | #endif |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 2072 | |
Glenn Randers-Pehrson | 4e6b5e9 | 2009-09-23 10:24:53 -0500 | [diff] [blame] | 2073 | #ifdef PNG_gAMA_SUPPORTED |
Glenn Randers-Pehrson | 23d3970 | 2010-12-06 18:28:02 -0600 | [diff] [blame] | 2074 | PNG_FP_EXPORT(137, png_uint_32, png_get_gAMA, |
Glenn Randers-Pehrson | c36bb79 | 2011-02-12 09:49:07 -0600 | [diff] [blame] | 2075 | (png_const_structp png_ptr, png_const_infop info_ptr, |
Glenn Randers-Pehrson | 23d3970 | 2010-12-06 18:28:02 -0600 | [diff] [blame] | 2076 | double *file_gamma)); |
Glenn Randers-Pehrson | b86b492 | 2011-01-21 23:12:51 -0600 | [diff] [blame] | 2077 | PNG_FIXED_EXPORT(138, png_uint_32, png_get_gAMA_fixed, |
John Bowler | 0a5c9c0 | 2011-01-22 17:36:34 -0600 | [diff] [blame] | 2078 | (png_const_structp png_ptr, png_const_infop info_ptr, |
Glenn Randers-Pehrson | b86b492 | 2011-01-21 23:12:51 -0600 | [diff] [blame] | 2079 | png_fixed_point *int_file_gamma)); |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame] | 2080 | #endif |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 2081 | |
Glenn Randers-Pehrson | 4e6b5e9 | 2009-09-23 10:24:53 -0500 | [diff] [blame] | 2082 | #ifdef PNG_gAMA_SUPPORTED |
Glenn Randers-Pehrson | b86b492 | 2011-01-21 23:12:51 -0600 | [diff] [blame] | 2083 | PNG_FP_EXPORT(139, void, png_set_gAMA, (png_structp png_ptr, |
| 2084 | png_infop info_ptr, double file_gamma)); |
Glenn Randers-Pehrson | c36bb79 | 2011-02-12 09:49:07 -0600 | [diff] [blame] | 2085 | PNG_FIXED_EXPORT(140, void, png_set_gAMA_fixed, (png_structp png_ptr, |
Glenn Randers-Pehrson | 23d3970 | 2010-12-06 18:28:02 -0600 | [diff] [blame] | 2086 | png_infop info_ptr, png_fixed_point int_file_gamma)); |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame] | 2087 | #endif |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 2088 | |
Glenn Randers-Pehrson | 4e6b5e9 | 2009-09-23 10:24:53 -0500 | [diff] [blame] | 2089 | #ifdef PNG_hIST_SUPPORTED |
Glenn Randers-Pehrson | 23d3970 | 2010-12-06 18:28:02 -0600 | [diff] [blame] | 2090 | PNG_EXPORT(141, png_uint_32, png_get_hIST, |
Glenn Randers-Pehrson | c36bb79 | 2011-02-12 09:49:07 -0600 | [diff] [blame] | 2091 | (png_const_structp png_ptr, png_const_infop info_ptr, |
Glenn Randers-Pehrson | 23d3970 | 2010-12-06 18:28:02 -0600 | [diff] [blame] | 2092 | png_uint_16p *hist)); |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame] | 2093 | #endif |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 2094 | |
Glenn Randers-Pehrson | 4e6b5e9 | 2009-09-23 10:24:53 -0500 | [diff] [blame] | 2095 | #ifdef PNG_hIST_SUPPORTED |
Glenn Randers-Pehrson | b86b492 | 2011-01-21 23:12:51 -0600 | [diff] [blame] | 2096 | PNG_EXPORT(142, void, png_set_hIST, (png_structp png_ptr, |
| 2097 | png_infop info_ptr, png_const_uint_16p hist)); |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame] | 2098 | #endif |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 2099 | |
Glenn Randers-Pehrson | 23d3970 | 2010-12-06 18:28:02 -0600 | [diff] [blame] | 2100 | PNG_EXPORT(143, png_uint_32, png_get_IHDR, |
Glenn Randers-Pehrson | c36bb79 | 2011-02-12 09:49:07 -0600 | [diff] [blame] | 2101 | (png_structp png_ptr, png_infop info_ptr, |
| 2102 | png_uint_32 *width, png_uint_32 *height, int *bit_depth, int *color_type, |
Glenn Randers-Pehrson | 23d3970 | 2010-12-06 18:28:02 -0600 | [diff] [blame] | 2103 | int *interlace_method, int *compression_method, int *filter_method)); |
Glenn Randers-Pehrson | 5c6aeb2 | 1998-12-29 11:47:59 -0600 | [diff] [blame] | 2104 | |
Glenn Randers-Pehrson | 23d3970 | 2010-12-06 18:28:02 -0600 | [diff] [blame] | 2105 | PNG_EXPORT(144, void, png_set_IHDR, |
Glenn Randers-Pehrson | c36bb79 | 2011-02-12 09:49:07 -0600 | [diff] [blame] | 2106 | (png_structp png_ptr, png_infop info_ptr, |
| 2107 | png_uint_32 width, png_uint_32 height, int bit_depth, int color_type, |
Glenn Randers-Pehrson | 23d3970 | 2010-12-06 18:28:02 -0600 | [diff] [blame] | 2108 | int interlace_method, int compression_method, int filter_method)); |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 2109 | |
Glenn Randers-Pehrson | 4e6b5e9 | 2009-09-23 10:24:53 -0500 | [diff] [blame] | 2110 | #ifdef PNG_oFFs_SUPPORTED |
Glenn Randers-Pehrson | 23d3970 | 2010-12-06 18:28:02 -0600 | [diff] [blame] | 2111 | PNG_EXPORT(145, png_uint_32, png_get_oFFs, |
Glenn Randers-Pehrson | c36bb79 | 2011-02-12 09:49:07 -0600 | [diff] [blame] | 2112 | (png_const_structp png_ptr, png_const_infop info_ptr, |
Glenn Randers-Pehrson | 23d3970 | 2010-12-06 18:28:02 -0600 | [diff] [blame] | 2113 | png_int_32 *offset_x, png_int_32 *offset_y, int *unit_type)); |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame] | 2114 | #endif |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 2115 | |
Glenn Randers-Pehrson | 4e6b5e9 | 2009-09-23 10:24:53 -0500 | [diff] [blame] | 2116 | #ifdef PNG_oFFs_SUPPORTED |
Glenn Randers-Pehrson | 23d3970 | 2010-12-06 18:28:02 -0600 | [diff] [blame] | 2117 | PNG_EXPORT(146, void, png_set_oFFs, |
Glenn Randers-Pehrson | c36bb79 | 2011-02-12 09:49:07 -0600 | [diff] [blame] | 2118 | (png_structp png_ptr, png_infop info_ptr, |
Glenn Randers-Pehrson | 23d3970 | 2010-12-06 18:28:02 -0600 | [diff] [blame] | 2119 | png_int_32 offset_x, png_int_32 offset_y, int unit_type)); |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame] | 2120 | #endif |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 2121 | |
Glenn Randers-Pehrson | 4e6b5e9 | 2009-09-23 10:24:53 -0500 | [diff] [blame] | 2122 | #ifdef PNG_pCAL_SUPPORTED |
Glenn Randers-Pehrson | 23d3970 | 2010-12-06 18:28:02 -0600 | [diff] [blame] | 2123 | PNG_EXPORT(147, png_uint_32, png_get_pCAL, |
Glenn Randers-Pehrson | c36bb79 | 2011-02-12 09:49:07 -0600 | [diff] [blame] | 2124 | (png_const_structp png_ptr, png_const_infop info_ptr, |
Glenn Randers-Pehrson | 23d3970 | 2010-12-06 18:28:02 -0600 | [diff] [blame] | 2125 | png_charp *purpose, png_int_32 *X0, png_int_32 *X1, int *type, |
Glenn Randers-Pehrson | c36bb79 | 2011-02-12 09:49:07 -0600 | [diff] [blame] | 2126 | int *nparams, |
Glenn Randers-Pehrson | 23d3970 | 2010-12-06 18:28:02 -0600 | [diff] [blame] | 2127 | png_charp *units, png_charpp *params)); |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame] | 2128 | #endif |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 2129 | |
Glenn Randers-Pehrson | 4e6b5e9 | 2009-09-23 10:24:53 -0500 | [diff] [blame] | 2130 | #ifdef PNG_pCAL_SUPPORTED |
Glenn Randers-Pehrson | b86b492 | 2011-01-21 23:12:51 -0600 | [diff] [blame] | 2131 | PNG_EXPORT(148, void, png_set_pCAL, (png_structp png_ptr, |
Glenn Randers-Pehrson | c36bb79 | 2011-02-12 09:49:07 -0600 | [diff] [blame] | 2132 | png_infop info_ptr, |
| 2133 | png_const_charp purpose, png_int_32 X0, png_int_32 X1, int type, |
Glenn Randers-Pehrson | 23d3970 | 2010-12-06 18:28:02 -0600 | [diff] [blame] | 2134 | int nparams, png_const_charp units, png_charpp params)); |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame] | 2135 | #endif |
| 2136 | |
Glenn Randers-Pehrson | 4e6b5e9 | 2009-09-23 10:24:53 -0500 | [diff] [blame] | 2137 | #ifdef PNG_pHYs_SUPPORTED |
Glenn Randers-Pehrson | 23d3970 | 2010-12-06 18:28:02 -0600 | [diff] [blame] | 2138 | PNG_EXPORT(149, png_uint_32, png_get_pHYs, |
Glenn Randers-Pehrson | c36bb79 | 2011-02-12 09:49:07 -0600 | [diff] [blame] | 2139 | (png_const_structp png_ptr, png_const_infop info_ptr, |
Glenn Randers-Pehrson | 23d3970 | 2010-12-06 18:28:02 -0600 | [diff] [blame] | 2140 | 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] | 2141 | #endif |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 2142 | |
Glenn Randers-Pehrson | 4e6b5e9 | 2009-09-23 10:24:53 -0500 | [diff] [blame] | 2143 | #ifdef PNG_pHYs_SUPPORTED |
Glenn Randers-Pehrson | 23d3970 | 2010-12-06 18:28:02 -0600 | [diff] [blame] | 2144 | PNG_EXPORT(150, void, png_set_pHYs, |
Glenn Randers-Pehrson | c36bb79 | 2011-02-12 09:49:07 -0600 | [diff] [blame] | 2145 | (png_structp png_ptr, png_infop info_ptr, |
Glenn Randers-Pehrson | 23d3970 | 2010-12-06 18:28:02 -0600 | [diff] [blame] | 2146 | 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] | 2147 | #endif |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 2148 | |
Glenn Randers-Pehrson | 23d3970 | 2010-12-06 18:28:02 -0600 | [diff] [blame] | 2149 | PNG_EXPORT(151, png_uint_32, png_get_PLTE, |
Glenn Randers-Pehrson | c36bb79 | 2011-02-12 09:49:07 -0600 | [diff] [blame] | 2150 | (png_const_structp png_ptr, png_const_infop info_ptr, |
Glenn Randers-Pehrson | 23d3970 | 2010-12-06 18:28:02 -0600 | [diff] [blame] | 2151 | png_colorp *palette, int *num_palette)); |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 2152 | |
Glenn Randers-Pehrson | 23d3970 | 2010-12-06 18:28:02 -0600 | [diff] [blame] | 2153 | PNG_EXPORT(152, void, png_set_PLTE, |
Glenn Randers-Pehrson | c36bb79 | 2011-02-12 09:49:07 -0600 | [diff] [blame] | 2154 | (png_structp png_ptr, png_infop info_ptr, |
Glenn Randers-Pehrson | 23d3970 | 2010-12-06 18:28:02 -0600 | [diff] [blame] | 2155 | png_const_colorp palette, int num_palette)); |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 2156 | |
Glenn Randers-Pehrson | 4e6b5e9 | 2009-09-23 10:24:53 -0500 | [diff] [blame] | 2157 | #ifdef PNG_sBIT_SUPPORTED |
Glenn Randers-Pehrson | 23d3970 | 2010-12-06 18:28:02 -0600 | [diff] [blame] | 2158 | PNG_EXPORT(153, png_uint_32, png_get_sBIT, |
Glenn Randers-Pehrson | c36bb79 | 2011-02-12 09:49:07 -0600 | [diff] [blame] | 2159 | (png_const_structp png_ptr, png_infop info_ptr, |
Glenn Randers-Pehrson | 23d3970 | 2010-12-06 18:28:02 -0600 | [diff] [blame] | 2160 | png_color_8p *sig_bit)); |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame] | 2161 | #endif |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 2162 | |
Glenn Randers-Pehrson | 4e6b5e9 | 2009-09-23 10:24:53 -0500 | [diff] [blame] | 2163 | #ifdef PNG_sBIT_SUPPORTED |
Glenn Randers-Pehrson | 23d3970 | 2010-12-06 18:28:02 -0600 | [diff] [blame] | 2164 | PNG_EXPORT(154, void, png_set_sBIT, |
| 2165 | (png_structp png_ptr, png_infop info_ptr, png_const_color_8p sig_bit)); |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame] | 2166 | #endif |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 2167 | |
Glenn Randers-Pehrson | 4e6b5e9 | 2009-09-23 10:24:53 -0500 | [diff] [blame] | 2168 | #ifdef PNG_sRGB_SUPPORTED |
John Bowler | 0a5c9c0 | 2011-01-22 17:36:34 -0600 | [diff] [blame] | 2169 | PNG_EXPORT(155, png_uint_32, png_get_sRGB, (png_const_structp png_ptr, |
Glenn Randers-Pehrson | 8d0bc0f | 2011-01-25 22:15:58 -0600 | [diff] [blame] | 2170 | png_const_infop info_ptr, int *file_srgb_intent)); |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame] | 2171 | #endif |
Glenn Randers-Pehrson | b6ce43d | 1998-01-01 07:13:13 -0600 | [diff] [blame] | 2172 | |
Glenn Randers-Pehrson | 4e6b5e9 | 2009-09-23 10:24:53 -0500 | [diff] [blame] | 2173 | #ifdef PNG_sRGB_SUPPORTED |
Glenn Randers-Pehrson | 23d3970 | 2010-12-06 18:28:02 -0600 | [diff] [blame] | 2174 | PNG_EXPORT(156, void, png_set_sRGB, |
Glenn Randers-Pehrson | 8d0bc0f | 2011-01-25 22:15:58 -0600 | [diff] [blame] | 2175 | (png_structp png_ptr, png_infop info_ptr, int srgb_intent)); |
Glenn Randers-Pehrson | c36bb79 | 2011-02-12 09:49:07 -0600 | [diff] [blame] | 2176 | PNG_EXPORT(157, void, png_set_sRGB_gAMA_and_cHRM, (png_structp png_ptr, |
Glenn Randers-Pehrson | 8d0bc0f | 2011-01-25 22:15:58 -0600 | [diff] [blame] | 2177 | png_infop info_ptr, int srgb_intent)); |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame] | 2178 | #endif |
Glenn Randers-Pehrson | b6ce43d | 1998-01-01 07:13:13 -0600 | [diff] [blame] | 2179 | |
Glenn Randers-Pehrson | 4e6b5e9 | 2009-09-23 10:24:53 -0500 | [diff] [blame] | 2180 | #ifdef PNG_iCCP_SUPPORTED |
Glenn Randers-Pehrson | 23d3970 | 2010-12-06 18:28:02 -0600 | [diff] [blame] | 2181 | PNG_EXPORT(158, png_uint_32, png_get_iCCP, |
Glenn Randers-Pehrson | c36bb79 | 2011-02-12 09:49:07 -0600 | [diff] [blame] | 2182 | (png_const_structp png_ptr, png_const_infop info_ptr, |
| 2183 | png_charpp name, int *compression_type, png_bytepp profile, |
Glenn Randers-Pehrson | 23d3970 | 2010-12-06 18:28:02 -0600 | [diff] [blame] | 2184 | png_uint_32 *proflen)); |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame] | 2185 | #endif |
| 2186 | |
Glenn Randers-Pehrson | 4e6b5e9 | 2009-09-23 10:24:53 -0500 | [diff] [blame] | 2187 | #ifdef PNG_iCCP_SUPPORTED |
Glenn Randers-Pehrson | 23d3970 | 2010-12-06 18:28:02 -0600 | [diff] [blame] | 2188 | PNG_EXPORT(159, void, png_set_iCCP, |
Glenn Randers-Pehrson | c36bb79 | 2011-02-12 09:49:07 -0600 | [diff] [blame] | 2189 | (png_structp png_ptr, png_infop info_ptr, |
| 2190 | png_const_charp name, int compression_type, png_const_bytep profile, |
Glenn Randers-Pehrson | 23d3970 | 2010-12-06 18:28:02 -0600 | [diff] [blame] | 2191 | png_uint_32 proflen)); |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame] | 2192 | #endif |
| 2193 | |
Glenn Randers-Pehrson | 4e6b5e9 | 2009-09-23 10:24:53 -0500 | [diff] [blame] | 2194 | #ifdef PNG_sPLT_SUPPORTED |
Glenn Randers-Pehrson | 23d3970 | 2010-12-06 18:28:02 -0600 | [diff] [blame] | 2195 | PNG_EXPORT(160, png_uint_32, png_get_sPLT, |
Glenn Randers-Pehrson | c36bb79 | 2011-02-12 09:49:07 -0600 | [diff] [blame] | 2196 | (png_const_structp png_ptr, png_const_infop info_ptr, |
Glenn Randers-Pehrson | 23d3970 | 2010-12-06 18:28:02 -0600 | [diff] [blame] | 2197 | png_sPLT_tpp entries)); |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame] | 2198 | #endif |
| 2199 | |
Glenn Randers-Pehrson | 4e6b5e9 | 2009-09-23 10:24:53 -0500 | [diff] [blame] | 2200 | #ifdef PNG_sPLT_SUPPORTED |
Glenn Randers-Pehrson | 23d3970 | 2010-12-06 18:28:02 -0600 | [diff] [blame] | 2201 | PNG_EXPORT(161, void, png_set_sPLT, |
Glenn Randers-Pehrson | c36bb79 | 2011-02-12 09:49:07 -0600 | [diff] [blame] | 2202 | (png_structp png_ptr, png_infop info_ptr, |
Glenn Randers-Pehrson | 23d3970 | 2010-12-06 18:28:02 -0600 | [diff] [blame] | 2203 | png_const_sPLT_tp entries, int nentries)); |
Glenn Randers-Pehrson | 61c32d9 | 2000-02-04 23:40:16 -0600 | [diff] [blame] | 2204 | #endif |
| 2205 | |
Glenn Randers-Pehrson | 4e6b5e9 | 2009-09-23 10:24:53 -0500 | [diff] [blame] | 2206 | #ifdef PNG_TEXT_SUPPORTED |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame] | 2207 | /* png_get_text also returns the number of text chunks in *num_text */ |
Glenn Randers-Pehrson | 23d3970 | 2010-12-06 18:28:02 -0600 | [diff] [blame] | 2208 | PNG_EXPORT(162, png_uint_32, png_get_text, |
Glenn Randers-Pehrson | c36bb79 | 2011-02-12 09:49:07 -0600 | [diff] [blame] | 2209 | (png_const_structp png_ptr, png_const_infop info_ptr, |
Glenn Randers-Pehrson | 23d3970 | 2010-12-06 18:28:02 -0600 | [diff] [blame] | 2210 | png_textp *text_ptr, int *num_text)); |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame] | 2211 | #endif |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 2212 | |
Glenn Randers-Pehrson | c36bb79 | 2011-02-12 09:49:07 -0600 | [diff] [blame] | 2213 | /* Note while png_set_text() will accept a structure whose text, |
Glenn Randers-Pehrson | 6c7a09a | 2009-06-15 21:57:39 -0500 | [diff] [blame] | 2214 | * language, and translated keywords are NULL pointers, the structure |
| 2215 | * returned by png_get_text will always contain regular |
| 2216 | * zero-terminated C strings. They might be empty strings but |
| 2217 | * they will never be NULL pointers. |
Glenn Randers-Pehrson | 4accabb | 2000-04-14 14:20:47 -0500 | [diff] [blame] | 2218 | */ |
| 2219 | |
Glenn Randers-Pehrson | 4e6b5e9 | 2009-09-23 10:24:53 -0500 | [diff] [blame] | 2220 | #ifdef PNG_TEXT_SUPPORTED |
Glenn Randers-Pehrson | 23d3970 | 2010-12-06 18:28:02 -0600 | [diff] [blame] | 2221 | PNG_EXPORT(163, void, png_set_text, |
Glenn Randers-Pehrson | c36bb79 | 2011-02-12 09:49:07 -0600 | [diff] [blame] | 2222 | (png_structp png_ptr, png_infop info_ptr, |
Glenn Randers-Pehrson | 23d3970 | 2010-12-06 18:28:02 -0600 | [diff] [blame] | 2223 | png_const_textp text_ptr, int num_text)); |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame] | 2224 | #endif |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 2225 | |
Glenn Randers-Pehrson | 4e6b5e9 | 2009-09-23 10:24:53 -0500 | [diff] [blame] | 2226 | #ifdef PNG_tIME_SUPPORTED |
Glenn Randers-Pehrson | 23d3970 | 2010-12-06 18:28:02 -0600 | [diff] [blame] | 2227 | PNG_EXPORT(164, png_uint_32, png_get_tIME, |
John Bowler | 0a5c9c0 | 2011-01-22 17:36:34 -0600 | [diff] [blame] | 2228 | (png_const_structp png_ptr, png_infop info_ptr, png_timep *mod_time)); |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame] | 2229 | #endif |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 2230 | |
Glenn Randers-Pehrson | 4e6b5e9 | 2009-09-23 10:24:53 -0500 | [diff] [blame] | 2231 | #ifdef PNG_tIME_SUPPORTED |
Glenn Randers-Pehrson | 23d3970 | 2010-12-06 18:28:02 -0600 | [diff] [blame] | 2232 | PNG_EXPORT(165, void, png_set_tIME, |
| 2233 | (png_structp png_ptr, png_infop info_ptr, png_const_timep mod_time)); |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame] | 2234 | #endif |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 2235 | |
Glenn Randers-Pehrson | 4e6b5e9 | 2009-09-23 10:24:53 -0500 | [diff] [blame] | 2236 | #ifdef PNG_tRNS_SUPPORTED |
Glenn Randers-Pehrson | 23d3970 | 2010-12-06 18:28:02 -0600 | [diff] [blame] | 2237 | PNG_EXPORT(166, png_uint_32, png_get_tRNS, |
Glenn Randers-Pehrson | c36bb79 | 2011-02-12 09:49:07 -0600 | [diff] [blame] | 2238 | (png_const_structp png_ptr, png_infop info_ptr, |
Glenn Randers-Pehrson | 23d3970 | 2010-12-06 18:28:02 -0600 | [diff] [blame] | 2239 | png_bytep *trans_alpha, int *num_trans, png_color_16p *trans_color)); |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame] | 2240 | #endif |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 2241 | |
Glenn Randers-Pehrson | 4e6b5e9 | 2009-09-23 10:24:53 -0500 | [diff] [blame] | 2242 | #ifdef PNG_tRNS_SUPPORTED |
Glenn Randers-Pehrson | 23d3970 | 2010-12-06 18:28:02 -0600 | [diff] [blame] | 2243 | PNG_EXPORT(167, void, png_set_tRNS, |
Glenn Randers-Pehrson | c36bb79 | 2011-02-12 09:49:07 -0600 | [diff] [blame] | 2244 | (png_structp png_ptr, png_infop info_ptr, |
| 2245 | png_const_bytep trans_alpha, int num_trans, |
Glenn Randers-Pehrson | 23d3970 | 2010-12-06 18:28:02 -0600 | [diff] [blame] | 2246 | png_const_color_16p trans_color)); |
Glenn Randers-Pehrson | 61c32d9 | 2000-02-04 23:40:16 -0600 | [diff] [blame] | 2247 | #endif |
| 2248 | |
Glenn Randers-Pehrson | 4e6b5e9 | 2009-09-23 10:24:53 -0500 | [diff] [blame] | 2249 | #ifdef PNG_sCAL_SUPPORTED |
Glenn Randers-Pehrson | 23d3970 | 2010-12-06 18:28:02 -0600 | [diff] [blame] | 2250 | PNG_FP_EXPORT(168, png_uint_32, png_get_sCAL, |
Glenn Randers-Pehrson | c36bb79 | 2011-02-12 09:49:07 -0600 | [diff] [blame] | 2251 | (png_const_structp png_ptr, png_const_infop info_ptr, |
Glenn Randers-Pehrson | 23d3970 | 2010-12-06 18:28:02 -0600 | [diff] [blame] | 2252 | int *unit, double *width, double *height)); |
Glenn Randers-Pehrson | 48dc6eb | 2010-07-31 07:09:58 -0500 | [diff] [blame] | 2253 | #ifdef PNG_FLOATING_ARITHMETIC_SUPPORTED |
Glenn Randers-Pehrson | c36bb79 | 2011-02-12 09:49:07 -0600 | [diff] [blame] | 2254 | /* NOTE: this API is currently implemented using floating point arithmetic, |
Glenn Randers-Pehrson | 48dc6eb | 2010-07-31 07:09:58 -0500 | [diff] [blame] | 2255 | * consequently it can only be used on systems with floating point support. |
| 2256 | * In any case the range of values supported by png_fixed_point is small and it |
| 2257 | * is highly recommended that png_get_sCAL_s be used instead. |
| 2258 | */ |
Glenn Randers-Pehrson | b86b492 | 2011-01-21 23:12:51 -0600 | [diff] [blame] | 2259 | PNG_FIXED_EXPORT(214, png_uint_32, png_get_sCAL_fixed, |
John Bowler | 0a5c9c0 | 2011-01-22 17:36:34 -0600 | [diff] [blame] | 2260 | (png_structp png_ptr, png_const_infop info_ptr, int *unit, |
Glenn Randers-Pehrson | c36bb79 | 2011-02-12 09:49:07 -0600 | [diff] [blame] | 2261 | png_fixed_point *width, |
Glenn Randers-Pehrson | 23d3970 | 2010-12-06 18:28:02 -0600 | [diff] [blame] | 2262 | png_fixed_point *height)); |
Glenn Randers-Pehrson | 48dc6eb | 2010-07-31 07:09:58 -0500 | [diff] [blame] | 2263 | #endif |
Glenn Randers-Pehrson | 23d3970 | 2010-12-06 18:28:02 -0600 | [diff] [blame] | 2264 | PNG_EXPORT(169, png_uint_32, png_get_sCAL_s, |
John Bowler | 0a5c9c0 | 2011-01-22 17:36:34 -0600 | [diff] [blame] | 2265 | (png_const_structp png_ptr, png_const_infop info_ptr, |
Glenn Randers-Pehrson | b86b492 | 2011-01-21 23:12:51 -0600 | [diff] [blame] | 2266 | int *unit, png_charpp swidth, png_charpp sheight)); |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame] | 2267 | |
Glenn Randers-Pehrson | 23d3970 | 2010-12-06 18:28:02 -0600 | [diff] [blame] | 2268 | PNG_FP_EXPORT(170, void, png_set_sCAL, |
Glenn Randers-Pehrson | c36bb79 | 2011-02-12 09:49:07 -0600 | [diff] [blame] | 2269 | (png_structp png_ptr, png_infop info_ptr, |
Glenn Randers-Pehrson | 23d3970 | 2010-12-06 18:28:02 -0600 | [diff] [blame] | 2270 | int unit, double width, double height)); |
Glenn Randers-Pehrson | c36bb79 | 2011-02-12 09:49:07 -0600 | [diff] [blame] | 2271 | PNG_FIXED_EXPORT(213, void, png_set_sCAL_fixed, (png_structp png_ptr, |
| 2272 | png_infop info_ptr, int unit, png_fixed_point width, |
Glenn Randers-Pehrson | 23d3970 | 2010-12-06 18:28:02 -0600 | [diff] [blame] | 2273 | png_fixed_point height)); |
| 2274 | PNG_EXPORT(171, void, png_set_sCAL_s, |
Glenn Randers-Pehrson | c36bb79 | 2011-02-12 09:49:07 -0600 | [diff] [blame] | 2275 | (png_structp png_ptr, png_infop info_ptr, |
Glenn Randers-Pehrson | 23d3970 | 2010-12-06 18:28:02 -0600 | [diff] [blame] | 2276 | int unit, png_const_charp swidth, png_const_charp sheight)); |
Glenn Randers-Pehrson | 31aee0d | 2010-07-29 17:39:14 -0500 | [diff] [blame] | 2277 | #endif /* PNG_sCAL_SUPPORTED */ |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame] | 2278 | |
Glenn Randers-Pehrson | 7824a70 | 2009-06-13 10:05:05 -0500 | [diff] [blame] | 2279 | #ifdef PNG_HANDLE_AS_UNKNOWN_SUPPORTED |
| 2280 | /* Provide a list of chunks and how they are to be handled, if the built-in |
Glenn Randers-Pehrson | 61c32d9 | 2000-02-04 23:40:16 -0600 | [diff] [blame] | 2281 | handling or default unknown chunk handling is not desired. Any chunks not |
| 2282 | listed will be handled in the default manner. The IHDR and IEND chunks |
| 2283 | must not be listed. |
Glenn Randers-Pehrson | 145f5c8 | 2008-07-10 09:13:13 -0500 | [diff] [blame] | 2284 | keep = 0: follow default behaviour |
Glenn Randers-Pehrson | 61c32d9 | 2000-02-04 23:40:16 -0600 | [diff] [blame] | 2285 | = 1: do not keep |
| 2286 | = 2: keep only if safe-to-copy |
| 2287 | = 3: keep even if unsafe-to-copy |
| 2288 | */ |
Glenn Randers-Pehrson | 23d3970 | 2010-12-06 18:28:02 -0600 | [diff] [blame] | 2289 | PNG_EXPORT(172, void, png_set_keep_unknown_chunks, |
Glenn Randers-Pehrson | c36bb79 | 2011-02-12 09:49:07 -0600 | [diff] [blame] | 2290 | (png_structp png_ptr, int keep, |
Glenn Randers-Pehrson | 23d3970 | 2010-12-06 18:28:02 -0600 | [diff] [blame] | 2291 | png_const_bytep chunk_list, int num_chunks)); |
Glenn Randers-Pehrson | c36bb79 | 2011-02-12 09:49:07 -0600 | [diff] [blame] | 2292 | PNG_EXPORT(173, int, png_handle_as_unknown, (png_structp png_ptr, |
Glenn Randers-Pehrson | 23d3970 | 2010-12-06 18:28:02 -0600 | [diff] [blame] | 2293 | png_const_bytep chunk_name)); |
Glenn Randers-Pehrson | 7824a70 | 2009-06-13 10:05:05 -0500 | [diff] [blame] | 2294 | #endif |
Glenn Randers-Pehrson | 4e6b5e9 | 2009-09-23 10:24:53 -0500 | [diff] [blame] | 2295 | #ifdef PNG_UNKNOWN_CHUNKS_SUPPORTED |
Glenn Randers-Pehrson | c36bb79 | 2011-02-12 09:49:07 -0600 | [diff] [blame] | 2296 | PNG_EXPORT(174, void, png_set_unknown_chunks, (png_structp png_ptr, |
Glenn Randers-Pehrson | b86b492 | 2011-01-21 23:12:51 -0600 | [diff] [blame] | 2297 | png_infop info_ptr, png_const_unknown_chunkp unknowns, |
| 2298 | int num_unknowns)); |
| 2299 | PNG_EXPORT(175, void, png_set_unknown_chunk_location, |
| 2300 | (png_structp png_ptr, png_infop info_ptr, int chunk, int location)); |
Glenn Randers-Pehrson | c36bb79 | 2011-02-12 09:49:07 -0600 | [diff] [blame] | 2301 | PNG_EXPORT(176, int, png_get_unknown_chunks, (png_const_structp png_ptr, |
John Bowler | 0a5c9c0 | 2011-01-22 17:36:34 -0600 | [diff] [blame] | 2302 | png_const_infop info_ptr, png_unknown_chunkpp entries)); |
Glenn Randers-Pehrson | 61c32d9 | 2000-02-04 23:40:16 -0600 | [diff] [blame] | 2303 | #endif |
| 2304 | |
Glenn Randers-Pehrson | fc4a143 | 2000-05-17 17:39:34 -0500 | [diff] [blame] | 2305 | /* 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] | 2306 | * 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] | 2307 | * you can use png_set_invalid(png_ptr, info_ptr, PNG_INFO_CHNK); |
| 2308 | */ |
Glenn Randers-Pehrson | 23d3970 | 2010-12-06 18:28:02 -0600 | [diff] [blame] | 2309 | PNG_EXPORT(177, void, png_set_invalid, |
| 2310 | (png_structp png_ptr, png_infop info_ptr, int mask)); |
Glenn Randers-Pehrson | fc4a143 | 2000-05-17 17:39:34 -0500 | [diff] [blame] | 2311 | |
Glenn Randers-Pehrson | 4e6b5e9 | 2009-09-23 10:24:53 -0500 | [diff] [blame] | 2312 | #ifdef PNG_INFO_IMAGE_SUPPORTED |
Glenn Randers-Pehrson | 6942d53 | 2000-05-01 09:31:54 -0500 | [diff] [blame] | 2313 | /* The "params" pointer is currently not used and is for future expansion. */ |
Glenn Randers-Pehrson | c36bb79 | 2011-02-12 09:49:07 -0600 | [diff] [blame] | 2314 | PNG_EXPORT(178, void, png_read_png, (png_structp png_ptr, png_infop info_ptr, |
Glenn Randers-Pehrson | 23d3970 | 2010-12-06 18:28:02 -0600 | [diff] [blame] | 2315 | int transforms, png_voidp params)); |
Glenn Randers-Pehrson | c36bb79 | 2011-02-12 09:49:07 -0600 | [diff] [blame] | 2316 | PNG_EXPORT(179, void, png_write_png, (png_structp png_ptr, png_infop info_ptr, |
Glenn Randers-Pehrson | 23d3970 | 2010-12-06 18:28:02 -0600 | [diff] [blame] | 2317 | int transforms, png_voidp params)); |
Glenn Randers-Pehrson | 166c5a3 | 1999-12-10 09:43:02 -0600 | [diff] [blame] | 2318 | #endif |
Andreas Dilger | 47a0c42 | 1997-05-16 02:46:07 -0500 | [diff] [blame] | 2319 | |
Glenn Randers-Pehrson | b86b492 | 2011-01-21 23:12:51 -0600 | [diff] [blame] | 2320 | PNG_EXPORT(180, png_const_charp, png_get_copyright, |
John Bowler | 0a5c9c0 | 2011-01-22 17:36:34 -0600 | [diff] [blame] | 2321 | (png_const_structp png_ptr)); |
Glenn Randers-Pehrson | b86b492 | 2011-01-21 23:12:51 -0600 | [diff] [blame] | 2322 | PNG_EXPORT(181, png_const_charp, png_get_header_ver, |
John Bowler | 0a5c9c0 | 2011-01-22 17:36:34 -0600 | [diff] [blame] | 2323 | (png_const_structp png_ptr)); |
Glenn Randers-Pehrson | b86b492 | 2011-01-21 23:12:51 -0600 | [diff] [blame] | 2324 | PNG_EXPORT(182, png_const_charp, png_get_header_version, |
John Bowler | 0a5c9c0 | 2011-01-22 17:36:34 -0600 | [diff] [blame] | 2325 | (png_const_structp png_ptr)); |
Glenn Randers-Pehrson | b86b492 | 2011-01-21 23:12:51 -0600 | [diff] [blame] | 2326 | PNG_EXPORT(183, png_const_charp, png_get_libpng_ver, |
John Bowler | 0a5c9c0 | 2011-01-22 17:36:34 -0600 | [diff] [blame] | 2327 | (png_const_structp png_ptr)); |
Glenn Randers-Pehrson | c944229 | 1999-01-06 21:50:16 -0600 | [diff] [blame] | 2328 | |
Glenn Randers-Pehrson | 5e5c1e1 | 2000-11-10 12:26:19 -0600 | [diff] [blame] | 2329 | #ifdef PNG_MNG_FEATURES_SUPPORTED |
Glenn Randers-Pehrson | c36bb79 | 2011-02-12 09:49:07 -0600 | [diff] [blame] | 2330 | PNG_EXPORT(184, png_uint_32, png_permit_mng_features, (png_structp png_ptr, |
Glenn Randers-Pehrson | 23d3970 | 2010-12-06 18:28:02 -0600 | [diff] [blame] | 2331 | png_uint_32 mng_features_permitted)); |
Glenn Randers-Pehrson | 5e5c1e1 | 2000-11-10 12:26:19 -0600 | [diff] [blame] | 2332 | #endif |
| 2333 | |
Glenn Randers-Pehrson | 8f3dd83 | 2004-08-10 09:43:42 -0500 | [diff] [blame] | 2334 | /* For use in png_set_keep_unknown, added to version 1.2.6 */ |
| 2335 | #define PNG_HANDLE_CHUNK_AS_DEFAULT 0 |
| 2336 | #define PNG_HANDLE_CHUNK_NEVER 1 |
| 2337 | #define PNG_HANDLE_CHUNK_IF_SAFE 2 |
| 2338 | #define PNG_HANDLE_CHUNK_ALWAYS 3 |
| 2339 | |
Glenn Randers-Pehrson | e68f5a3 | 2001-05-14 09:20:53 -0500 | [diff] [blame] | 2340 | /* Strip the prepended error numbers ("#nnn ") from error and warning |
Glenn Randers-Pehrson | 6c7a09a | 2009-06-15 21:57:39 -0500 | [diff] [blame] | 2341 | * messages before passing them to the error or warning handler. |
| 2342 | */ |
Glenn Randers-Pehrson | e68f5a3 | 2001-05-14 09:20:53 -0500 | [diff] [blame] | 2343 | #ifdef PNG_ERROR_NUMBERS_SUPPORTED |
Glenn Randers-Pehrson | 23d3970 | 2010-12-06 18:28:02 -0600 | [diff] [blame] | 2344 | PNG_EXPORT(185, void, png_set_strip_error_numbers, |
Glenn Randers-Pehrson | c36bb79 | 2011-02-12 09:49:07 -0600 | [diff] [blame] | 2345 | (png_structp png_ptr, |
Glenn Randers-Pehrson | 23d3970 | 2010-12-06 18:28:02 -0600 | [diff] [blame] | 2346 | png_uint_32 strip_mode)); |
Glenn Randers-Pehrson | be9de0f | 2001-01-22 08:52:16 -0600 | [diff] [blame] | 2347 | #endif |
Glenn Randers-Pehrson | 272489d | 2004-08-04 06:34:52 -0500 | [diff] [blame] | 2348 | |
Glenn Randers-Pehrson | beb572e | 2006-08-19 13:59:24 -0500 | [diff] [blame] | 2349 | /* Added in libpng-1.2.6 */ |
Glenn Randers-Pehrson | 272489d | 2004-08-04 06:34:52 -0500 | [diff] [blame] | 2350 | #ifdef PNG_SET_USER_LIMITS_SUPPORTED |
Glenn Randers-Pehrson | c36bb79 | 2011-02-12 09:49:07 -0600 | [diff] [blame] | 2351 | PNG_EXPORT(186, void, png_set_user_limits, (png_structp png_ptr, |
Glenn Randers-Pehrson | 23d3970 | 2010-12-06 18:28:02 -0600 | [diff] [blame] | 2352 | 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] | 2353 | PNG_EXPORT(187, png_uint_32, png_get_user_width_max, |
John Bowler | 0a5c9c0 | 2011-01-22 17:36:34 -0600 | [diff] [blame] | 2354 | (png_const_structp png_ptr)); |
Glenn Randers-Pehrson | b86b492 | 2011-01-21 23:12:51 -0600 | [diff] [blame] | 2355 | PNG_EXPORT(188, png_uint_32, png_get_user_height_max, |
John Bowler | 0a5c9c0 | 2011-01-22 17:36:34 -0600 | [diff] [blame] | 2356 | (png_const_structp png_ptr)); |
Glenn Randers-Pehrson | 800d1e9 | 2008-08-20 17:25:21 -0500 | [diff] [blame] | 2357 | /* Added in libpng-1.4.0 */ |
Glenn Randers-Pehrson | c36bb79 | 2011-02-12 09:49:07 -0600 | [diff] [blame] | 2358 | PNG_EXPORT(189, void, png_set_chunk_cache_max, (png_structp png_ptr, |
Glenn Randers-Pehrson | 23d3970 | 2010-12-06 18:28:02 -0600 | [diff] [blame] | 2359 | png_uint_32 user_chunk_cache_max)); |
Glenn Randers-Pehrson | b86b492 | 2011-01-21 23:12:51 -0600 | [diff] [blame] | 2360 | PNG_EXPORT(190, png_uint_32, png_get_chunk_cache_max, |
John Bowler | 0a5c9c0 | 2011-01-22 17:36:34 -0600 | [diff] [blame] | 2361 | (png_const_structp png_ptr)); |
Glenn Randers-Pehrson | e3f3c4e | 2010-02-07 18:08:50 -0600 | [diff] [blame] | 2362 | /* Added in libpng-1.4.1 */ |
Glenn Randers-Pehrson | c36bb79 | 2011-02-12 09:49:07 -0600 | [diff] [blame] | 2363 | PNG_EXPORT(191, void, png_set_chunk_malloc_max, (png_structp png_ptr, |
Glenn Randers-Pehrson | 23d3970 | 2010-12-06 18:28:02 -0600 | [diff] [blame] | 2364 | png_alloc_size_t user_chunk_cache_max)); |
| 2365 | PNG_EXPORT(192, png_alloc_size_t, png_get_chunk_malloc_max, |
John Bowler | 0a5c9c0 | 2011-01-22 17:36:34 -0600 | [diff] [blame] | 2366 | (png_const_structp png_ptr)); |
Glenn Randers-Pehrson | 272489d | 2004-08-04 06:34:52 -0500 | [diff] [blame] | 2367 | #endif |
| 2368 | |
Glenn Randers-Pehrson | 31aee0d | 2010-07-29 17:39:14 -0500 | [diff] [blame] | 2369 | #if defined(PNG_INCH_CONVERSIONS_SUPPORTED) |
Glenn Randers-Pehrson | b86b492 | 2011-01-21 23:12:51 -0600 | [diff] [blame] | 2370 | PNG_EXPORT(193, png_uint_32, png_get_pixels_per_inch, |
John Bowler | 0a5c9c0 | 2011-01-22 17:36:34 -0600 | [diff] [blame] | 2371 | (png_const_structp png_ptr, png_const_infop info_ptr)); |
Glenn Randers-Pehrson | 6bc53be | 2006-06-16 07:52:03 -0500 | [diff] [blame] | 2372 | |
Glenn Randers-Pehrson | b86b492 | 2011-01-21 23:12:51 -0600 | [diff] [blame] | 2373 | PNG_EXPORT(194, png_uint_32, png_get_x_pixels_per_inch, |
John Bowler | 0a5c9c0 | 2011-01-22 17:36:34 -0600 | [diff] [blame] | 2374 | (png_const_structp png_ptr, png_const_infop info_ptr)); |
Glenn Randers-Pehrson | 6bc53be | 2006-06-16 07:52:03 -0500 | [diff] [blame] | 2375 | |
Glenn Randers-Pehrson | b86b492 | 2011-01-21 23:12:51 -0600 | [diff] [blame] | 2376 | PNG_EXPORT(195, png_uint_32, png_get_y_pixels_per_inch, |
John Bowler | 0a5c9c0 | 2011-01-22 17:36:34 -0600 | [diff] [blame] | 2377 | (png_const_structp png_ptr, png_const_infop info_ptr)); |
Glenn Randers-Pehrson | 6bc53be | 2006-06-16 07:52:03 -0500 | [diff] [blame] | 2378 | |
Glenn Randers-Pehrson | b86b492 | 2011-01-21 23:12:51 -0600 | [diff] [blame] | 2379 | PNG_FP_EXPORT(196, float, png_get_x_offset_inches, |
John Bowler | 0a5c9c0 | 2011-01-22 17:36:34 -0600 | [diff] [blame] | 2380 | (png_const_structp png_ptr, png_const_infop info_ptr)); |
Glenn Randers-Pehrson | 31aee0d | 2010-07-29 17:39:14 -0500 | [diff] [blame] | 2381 | #ifdef PNG_FIXED_POINT_SUPPORTED /* otherwise not implemented. */ |
Glenn Randers-Pehrson | c36bb79 | 2011-02-12 09:49:07 -0600 | [diff] [blame] | 2382 | PNG_FIXED_EXPORT(211, png_fixed_point, png_get_x_offset_inches_fixed, |
John Bowler | 0a5c9c0 | 2011-01-22 17:36:34 -0600 | [diff] [blame] | 2383 | (png_structp png_ptr, png_const_infop info_ptr)); |
Glenn Randers-Pehrson | 31aee0d | 2010-07-29 17:39:14 -0500 | [diff] [blame] | 2384 | #endif |
Glenn Randers-Pehrson | 6bc53be | 2006-06-16 07:52:03 -0500 | [diff] [blame] | 2385 | |
Glenn Randers-Pehrson | c36bb79 | 2011-02-12 09:49:07 -0600 | [diff] [blame] | 2386 | PNG_FP_EXPORT(197, float, png_get_y_offset_inches, (png_const_structp png_ptr, |
John Bowler | 0a5c9c0 | 2011-01-22 17:36:34 -0600 | [diff] [blame] | 2387 | png_const_infop info_ptr)); |
Glenn Randers-Pehrson | 31aee0d | 2010-07-29 17:39:14 -0500 | [diff] [blame] | 2388 | #ifdef PNG_FIXED_POINT_SUPPORTED /* otherwise not implemented. */ |
Glenn Randers-Pehrson | c36bb79 | 2011-02-12 09:49:07 -0600 | [diff] [blame] | 2389 | PNG_FIXED_EXPORT(212, png_fixed_point, png_get_y_offset_inches_fixed, |
John Bowler | 0a5c9c0 | 2011-01-22 17:36:34 -0600 | [diff] [blame] | 2390 | (png_structp png_ptr, png_const_infop info_ptr)); |
Glenn Randers-Pehrson | 31aee0d | 2010-07-29 17:39:14 -0500 | [diff] [blame] | 2391 | #endif |
Glenn Randers-Pehrson | 6bc53be | 2006-06-16 07:52:03 -0500 | [diff] [blame] | 2392 | |
Glenn Randers-Pehrson | d4df36c | 2010-03-06 10:45:55 -0600 | [diff] [blame] | 2393 | # ifdef PNG_pHYs_SUPPORTED |
Glenn Randers-Pehrson | c36bb79 | 2011-02-12 09:49:07 -0600 | [diff] [blame] | 2394 | PNG_EXPORT(198, png_uint_32, png_get_pHYs_dpi, (png_const_structp png_ptr, |
John Bowler | 0a5c9c0 | 2011-01-22 17:36:34 -0600 | [diff] [blame] | 2395 | png_const_infop 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] | 2396 | int *unit_type)); |
Glenn Randers-Pehrson | d4df36c | 2010-03-06 10:45:55 -0600 | [diff] [blame] | 2397 | # endif /* PNG_pHYs_SUPPORTED */ |
Glenn Randers-Pehrson | 31aee0d | 2010-07-29 17:39:14 -0500 | [diff] [blame] | 2398 | #endif /* PNG_INCH_CONVERSIONS_SUPPORTED */ |
Glenn Randers-Pehrson | 6bc53be | 2006-06-16 07:52:03 -0500 | [diff] [blame] | 2399 | |
Glenn Randers-Pehrson | beb572e | 2006-08-19 13:59:24 -0500 | [diff] [blame] | 2400 | /* Added in libpng-1.4.0 */ |
| 2401 | #ifdef PNG_IO_STATE_SUPPORTED |
Glenn Randers-Pehrson | 23d3970 | 2010-12-06 18:28:02 -0600 | [diff] [blame] | 2402 | PNG_EXPORT(199, png_uint_32, png_get_io_state, (png_structp png_ptr)); |
Glenn Randers-Pehrson | beb572e | 2006-08-19 13:59:24 -0500 | [diff] [blame] | 2403 | |
Glenn Randers-Pehrson | a63dbed | 2011-01-22 08:51:19 -0600 | [diff] [blame] | 2404 | PNG_EXPORTA(200, png_const_bytep, png_get_io_chunk_name, |
| 2405 | (png_structp png_ptr), PNG_DEPRECATED); |
Glenn Randers-Pehrson | cf7cce6 | 2011-01-22 12:42:43 -0600 | [diff] [blame] | 2406 | PNG_EXPORT(216, png_uint_32, png_get_io_chunk_type, |
John Bowler | 0a5c9c0 | 2011-01-22 17:36:34 -0600 | [diff] [blame] | 2407 | (png_const_structp png_ptr)); |
Glenn Randers-Pehrson | beb572e | 2006-08-19 13:59:24 -0500 | [diff] [blame] | 2408 | |
| 2409 | /* The flags returned by png_get_io_state() are the following: */ |
Glenn Randers-Pehrson | d4df36c | 2010-03-06 10:45:55 -0600 | [diff] [blame] | 2410 | # define PNG_IO_NONE 0x0000 /* no I/O at this moment */ |
| 2411 | # define PNG_IO_READING 0x0001 /* currently reading */ |
| 2412 | # define PNG_IO_WRITING 0x0002 /* currently writing */ |
| 2413 | # define PNG_IO_SIGNATURE 0x0010 /* currently at the file signature */ |
| 2414 | # define PNG_IO_CHUNK_HDR 0x0020 /* currently at the chunk header */ |
| 2415 | # define PNG_IO_CHUNK_DATA 0x0040 /* currently at the chunk data */ |
| 2416 | # define PNG_IO_CHUNK_CRC 0x0080 /* currently at the chunk crc */ |
| 2417 | # define PNG_IO_MASK_OP 0x000f /* current operation: reading/writing */ |
| 2418 | # 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] | 2419 | #endif /* ?PNG_IO_STATE_SUPPORTED */ |
| 2420 | |
John Bowler | 660c6e4 | 2010-12-19 06:22:23 -0600 | [diff] [blame] | 2421 | /* Interlace support. The following macros are always defined so that if |
| 2422 | * libpng interlace handling is turned off the macros may be used to handle |
| 2423 | * interlaced images within the application. |
| 2424 | */ |
| 2425 | #define PNG_INTERLACE_ADAM7_PASSES 7 |
| 2426 | |
| 2427 | /* Two macros to return the first row and first column of the original, |
| 2428 | * full, image which appears in a given pass. 'pass' is in the range 0 |
| 2429 | * to 6 and the result is in the range 0 to 7. |
| 2430 | */ |
| 2431 | #define PNG_PASS_START_ROW(pass) (((1U&~(pass))<<(3-((pass)>>1)))&7) |
| 2432 | #define PNG_PASS_START_COL(pass) (((1U& (pass))<<(3-(((pass)+1)>>1)))&7) |
| 2433 | |
| 2434 | /* Two macros to help evaluate the number of rows or columns in each |
| 2435 | * pass. This is expressed as a shift - effectively log2 of the number or |
| 2436 | * rows or columns in each 8x8 tile of the original image. |
| 2437 | */ |
| 2438 | #define PNG_PASS_ROW_SHIFT(pass) ((pass)>2?(8-(pass))>>1:3) |
| 2439 | #define PNG_PASS_COL_SHIFT(pass) ((pass)>1?(7-(pass))>>1:3) |
| 2440 | |
| 2441 | /* Hence two macros to determine the number of rows or columns in a given |
| 2442 | * pass of an image given its height or width. In fact these macros may |
| 2443 | * return non-zero even though the sub-image is empty, because the other |
| 2444 | * dimension may be empty for a small image. |
| 2445 | */ |
| 2446 | #define PNG_PASS_ROWS(height, pass) (((height)+(((1<<PNG_PASS_ROW_SHIFT(pass))\ |
| 2447 | -1)-PNG_PASS_START_ROW(pass)))>>PNG_PASS_ROW_SHIFT(pass)) |
| 2448 | #define PNG_PASS_COLS(width, pass) (((width)+(((1<<PNG_PASS_COL_SHIFT(pass))\ |
| 2449 | -1)-PNG_PASS_START_COL(pass)))>>PNG_PASS_COL_SHIFT(pass)) |
| 2450 | |
John Bowler | 9616ad9 | 2011-02-16 06:13:46 -0600 | [diff] [blame] | 2451 | /* For the reader row callbacks (both progressive and sequential) it is |
| 2452 | * necessary to find the row in the output image given a row in an interlaced |
| 2453 | * image, so two more macros: |
John Bowler | 660c6e4 | 2010-12-19 06:22:23 -0600 | [diff] [blame] | 2454 | */ |
| 2455 | #define PNG_ROW_FROM_PASS_ROW(yIn, pass) \ |
| 2456 | (((yIn)<<PNG_PASS_ROW_SHIFT(pass))+PNG_PASS_START_ROW(pass)) |
| 2457 | #define PNG_COL_FROM_PASS_COL(xIn, pass) \ |
| 2458 | (((xIn)<<PNG_PASS_COL_SHIFT(pass))+PNG_PASS_START_COL(pass)) |
| 2459 | |
| 2460 | /* Two macros which return a boolean (0 or 1) saying whether the given row |
| 2461 | * or column is in a particular pass. These use a common utility macro that |
| 2462 | * returns a mask for a given pass - the offset 'off' selects the row or |
| 2463 | * column version. The mask has the appropriate bit set for each column in |
| 2464 | * the tile. |
| 2465 | */ |
| 2466 | #define PNG_PASS_MASK(pass,off) ( \ |
| 2467 | ((0x110145AFU>>(((7-(off))-(pass))<<2)) & 0xFU) | \ |
| 2468 | ((0x01145AF0U>>(((7-(off))-(pass))<<2)) & 0xF0U)) |
| 2469 | |
| 2470 | #define PNG_ROW_IN_INTERLACE_PASS(y, pass) \ |
| 2471 | ((PNG_PASS_MASK(pass,0) >> ((y)&7)) & 1) |
| 2472 | #define PNG_COL_IN_INTERLACE_PASS(x, pass) \ |
| 2473 | ((PNG_PASS_MASK(pass,1) >> ((x)&7)) & 1) |
| 2474 | |
Glenn Randers-Pehrson | 1d96361 | 1998-05-02 12:52:25 -0500 | [diff] [blame] | 2475 | #ifdef PNG_READ_COMPOSITE_NODIV_SUPPORTED |
Glenn Randers-Pehrson | 8686fff | 1998-05-21 09:27:50 -0500 | [diff] [blame] | 2476 | /* With these routines we avoid an integer divide, which will be slower on |
| 2477 | * most machines. However, it does take more operations than the corresponding |
| 2478 | * 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] | 2479 | * shifts (by 8 or 16 bits) and an addition, versus a single integer divide. |
| 2480 | * |
| 2481 | * Note that the rounding factors are NOT supposed to be the same! 128 and |
| 2482 | * 32768 are correct for the NODIV code; 127 and 32767 are correct for the |
| 2483 | * standard method. |
| 2484 | * |
| 2485 | * [Optimized code by Greg Roelofs and Mark Adler...blame us for bugs. :-) ] |
| 2486 | */ |
| 2487 | |
Glenn Randers-Pehrson | eae8e36 | 2010-03-12 17:36:53 -0600 | [diff] [blame] | 2488 | /* 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] | 2489 | |
Glenn Randers-Pehrson | e3f3c4e | 2010-02-07 18:08:50 -0600 | [diff] [blame] | 2490 | # define png_composite(composite, fg, alpha, bg) \ |
| 2491 | { png_uint_16 temp = (png_uint_16)((png_uint_16)(fg) \ |
| 2492 | * (png_uint_16)(alpha) \ |
| 2493 | + (png_uint_16)(bg)*(png_uint_16)(255 \ |
| 2494 | - (png_uint_16)(alpha)) + (png_uint_16)128); \ |
Glenn Randers-Pehrson | 1d96361 | 1998-05-02 12:52:25 -0500 | [diff] [blame] | 2495 | (composite) = (png_byte)((temp + (temp >> 8)) >> 8); } |
Glenn Randers-Pehrson | 5c6aeb2 | 1998-12-29 11:47:59 -0600 | [diff] [blame] | 2496 | |
Glenn Randers-Pehrson | e3f3c4e | 2010-02-07 18:08:50 -0600 | [diff] [blame] | 2497 | # define png_composite_16(composite, fg, alpha, bg) \ |
| 2498 | { png_uint_32 temp = (png_uint_32)((png_uint_32)(fg) \ |
| 2499 | * (png_uint_32)(alpha) \ |
| 2500 | + (png_uint_32)(bg)*(png_uint_32)(65535L \ |
| 2501 | - (png_uint_32)(alpha)) + (png_uint_32)32768L); \ |
Glenn Randers-Pehrson | 1d96361 | 1998-05-02 12:52:25 -0500 | [diff] [blame] | 2502 | (composite) = (png_uint_16)((temp + (temp >> 16)) >> 16); } |
| 2503 | |
Glenn Randers-Pehrson | 6c7a09a | 2009-06-15 21:57:39 -0500 | [diff] [blame] | 2504 | #else /* Standard method using integer division */ |
Glenn Randers-Pehrson | 1d96361 | 1998-05-02 12:52:25 -0500 | [diff] [blame] | 2505 | |
Glenn Randers-Pehrson | eae8e36 | 2010-03-12 17:36:53 -0600 | [diff] [blame] | 2506 | # define png_composite(composite, fg, alpha, bg) \ |
| 2507 | (composite) = (png_byte)(((png_uint_16)(fg) * (png_uint_16)(alpha) + \ |
Glenn Randers-Pehrson | e8b1aa0 | 2010-03-06 11:39:29 -0600 | [diff] [blame] | 2508 | (png_uint_16)(bg) * (png_uint_16)(255 - (png_uint_16)(alpha)) + \ |
| 2509 | (png_uint_16)127) / 255) |
Glenn Randers-Pehrson | 5c6aeb2 | 1998-12-29 11:47:59 -0600 | [diff] [blame] | 2510 | |
| 2511 | # define png_composite_16(composite, fg, alpha, bg) \ |
Glenn Randers-Pehrson | 1d96361 | 1998-05-02 12:52:25 -0500 | [diff] [blame] | 2512 | (composite) = (png_uint_16)(((png_uint_32)(fg) * (png_uint_32)(alpha) + \ |
Glenn Randers-Pehrson | eae8e36 | 2010-03-12 17:36:53 -0600 | [diff] [blame] | 2513 | (png_uint_32)(bg)*(png_uint_32)(65535L - (png_uint_32)(alpha)) + \ |
Glenn Randers-Pehrson | e8b1aa0 | 2010-03-06 11:39:29 -0600 | [diff] [blame] | 2514 | (png_uint_32)32767) / (png_uint_32)65535L) |
Glenn Randers-Pehrson | 1d96361 | 1998-05-02 12:52:25 -0500 | [diff] [blame] | 2515 | #endif /* PNG_READ_COMPOSITE_NODIV_SUPPORTED */ |
| 2516 | |
Glenn Randers-Pehrson | c3d73f4 | 2010-04-24 09:18:57 -0500 | [diff] [blame] | 2517 | #ifdef PNG_READ_INT_FUNCTIONS_SUPPORTED |
Glenn Randers-Pehrson | 23d3970 | 2010-12-06 18:28:02 -0600 | [diff] [blame] | 2518 | PNG_EXPORT(201, png_uint_32, png_get_uint_32, (png_const_bytep buf)); |
| 2519 | PNG_EXPORT(202, png_uint_16, png_get_uint_16, (png_const_bytep buf)); |
| 2520 | 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] | 2521 | #endif |
| 2522 | |
Glenn Randers-Pehrson | c36bb79 | 2011-02-12 09:49:07 -0600 | [diff] [blame] | 2523 | PNG_EXPORT(204, png_uint_32, png_get_uint_31, (png_structp png_ptr, |
Glenn Randers-Pehrson | 23d3970 | 2010-12-06 18:28:02 -0600 | [diff] [blame] | 2524 | png_const_bytep buf)); |
Glenn Randers-Pehrson | 9c3ab68 | 2006-02-20 22:09:05 -0600 | [diff] [blame] | 2525 | /* No png_get_int_16 -- may be added if there's a real need for it. */ |
| 2526 | |
Glenn Randers-Pehrson | 6c7a09a | 2009-06-15 21:57:39 -0500 | [diff] [blame] | 2527 | /* 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] | 2528 | #ifdef PNG_WRITE_INT_FUNCTIONS_SUPPORTED |
Glenn Randers-Pehrson | 23d3970 | 2010-12-06 18:28:02 -0600 | [diff] [blame] | 2529 | 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] | 2530 | #endif |
Glenn Randers-Pehrson | 862cb20 | 2010-04-16 22:12:51 -0500 | [diff] [blame] | 2531 | #ifdef PNG_SAVE_INT_32_SUPPORTED |
Glenn Randers-Pehrson | 23d3970 | 2010-12-06 18:28:02 -0600 | [diff] [blame] | 2532 | 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] | 2533 | #endif |
Glenn Randers-Pehrson | 9c3ab68 | 2006-02-20 22:09:05 -0600 | [diff] [blame] | 2534 | |
| 2535 | /* 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] | 2536 | * The parameter is declared unsigned int, not png_uint_16, |
Glenn Randers-Pehrson | 9c3ab68 | 2006-02-20 22:09:05 -0600 | [diff] [blame] | 2537 | * just to avoid potential problems on pre-ANSI C compilers. |
| 2538 | */ |
Glenn Randers-Pehrson | c3d73f4 | 2010-04-24 09:18:57 -0500 | [diff] [blame] | 2539 | #ifdef PNG_WRITE_INT_FUNCTIONS_SUPPORTED |
Glenn Randers-Pehrson | 23d3970 | 2010-12-06 18:28:02 -0600 | [diff] [blame] | 2540 | 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] | 2541 | /* 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] | 2542 | #endif |
Glenn Randers-Pehrson | 9c3ab68 | 2006-02-20 22:09:05 -0600 | [diff] [blame] | 2543 | |
John Bowler | f21a0d0 | 2011-01-23 23:55:19 -0600 | [diff] [blame] | 2544 | #ifdef PNG_USE_READ_MACROS |
| 2545 | /* Inline macros to do direct reads of bytes from the input buffer. |
| 2546 | * The png_get_int_32() routine assumes we are using two's complement |
| 2547 | * format for negative values, which is almost certainly true. |
| 2548 | */ |
| 2549 | # define png_get_uint_32(buf) \ |
| 2550 | (((png_uint_32)(*(buf)) << 24) + \ |
| 2551 | ((png_uint_32)(*((buf) + 1)) << 16) + \ |
| 2552 | ((png_uint_32)(*((buf) + 2)) << 8) + \ |
| 2553 | ((png_uint_32)(*((buf) + 3)))) |
| 2554 | |
| 2555 | /* From libpng-1.4.0 until 1.4.4, the png_get_uint_16 macro (but not the |
| 2556 | * function) incorrectly returned a value of type png_uint_32. |
| 2557 | */ |
| 2558 | # define png_get_uint_16(buf) \ |
| 2559 | ((png_uint_16) \ |
| 2560 | (((unsigned int)(*(buf)) << 8) + \ |
| 2561 | ((unsigned int)(*((buf) + 1))))) |
| 2562 | |
| 2563 | # define png_get_int_32(buf) \ |
| 2564 | ((png_int_32)((*(buf) & 0x80) \ |
| 2565 | ? -((png_int_32)((png_get_uint_32(buf) ^ 0xffffffffL) + 1)) \ |
| 2566 | : (png_int_32)png_get_uint_32(buf))) |
| 2567 | #endif |
| 2568 | |
Glenn Randers-Pehrson | 31aee0d | 2010-07-29 17:39:14 -0500 | [diff] [blame] | 2569 | /* Maintainer: Put new public prototypes here ^, in libpng.3, and project |
| 2570 | * defs |
| 2571 | */ |
| 2572 | |
Glenn Randers-Pehrson | 9f044c1 | 2010-12-07 14:59:43 -0600 | [diff] [blame] | 2573 | /* 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] | 2574 | * one to use is one more than this.) Maintainer, remember to add an entry to |
| 2575 | * scripts/symbols.def as well. |
Glenn Randers-Pehrson | c551c0d | 2010-03-16 07:52:34 -0500 | [diff] [blame] | 2576 | */ |
| 2577 | #ifdef PNG_EXPORT_LAST_ORDINAL |
Glenn Randers-Pehrson | 413138a | 2011-06-13 22:07:37 -0500 | [diff] [blame] | 2578 | PNG_EXPORT_LAST_ORDINAL(229); |
Glenn Randers-Pehrson | c551c0d | 2010-03-16 07:52:34 -0500 | [diff] [blame] | 2579 | #endif |
| 2580 | |
Andreas Dilger | 02ad0ef | 1997-01-17 01:34:35 -0600 | [diff] [blame] | 2581 | #ifdef __cplusplus |
| 2582 | } |
| 2583 | #endif |
| 2584 | |
Glenn Randers-Pehrson | 1ef65b6 | 2000-05-12 06:19:53 -0500 | [diff] [blame] | 2585 | #endif /* PNG_VERSION_INFO_ONLY */ |
Glenn Randers-Pehrson | 6c7a09a | 2009-06-15 21:57:39 -0500 | [diff] [blame] | 2586 | /* Do not put anything past this line */ |
Glenn Randers-Pehrson | 1394480 | 2000-06-24 07:42:42 -0500 | [diff] [blame] | 2587 | #endif /* PNG_H */ |