| 1 |
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| 2 | /* png.h - header file for PNG reference library
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| 3 | *
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| 4 | * libpng version 1.4.0 - January 3, 2010
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| 5 | * Copyright (c) 1998-2010 Glenn Randers-Pehrson
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| 6 | * (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger)
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| 7 | * (Version 0.88 Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.)
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| 8 | *
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| 9 | * This code is released under the libpng license (See LICENSE, below)
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| 10 | *
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| 11 | * Authors and maintainers:
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| 12 | * libpng versions 0.71, May 1995, through 0.88, January 1996: Guy Schalnat
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| 13 | * libpng versions 0.89c, June 1996, through 0.96, May 1997: Andreas Dilger
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| 14 | * libpng versions 0.97, January 1998, through 1.4.0 - January 3, 2010: Glenn
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| 15 | * See also "Contributing Authors", below.
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| 16 | *
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| 17 | * Note about libpng version numbers:
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| 18 | *
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| 19 | * Due to various miscommunications, unforeseen code incompatibilities
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| 20 | * and occasional factors outside the authors' control, version numbering
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| 21 | * on the library has not always been consistent and straightforward.
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| 22 | * The following table summarizes matters since version 0.89c, which was
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| 23 | * the first widely used release:
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| 24 | *
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| 25 | * source png.h png.h shared-lib
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| 26 | * version string int version
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| 27 | * ------- ------ ----- ----------
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| 28 | * 0.89c "1.0 beta 3" 0.89 89 1.0.89
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| 29 | * 0.90 "1.0 beta 4" 0.90 90 0.90 [should have been 2.0.90]
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| 30 | * 0.95 "1.0 beta 5" 0.95 95 0.95 [should have been 2.0.95]
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| 31 | * 0.96 "1.0 beta 6" 0.96 96 0.96 [should have been 2.0.96]
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| 32 | * 0.97b "1.00.97 beta 7" 1.00.97 97 1.0.1 [should have been 2.0.97]
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| 33 | * 0.97c 0.97 97 2.0.97
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| 34 | * 0.98 0.98 98 2.0.98
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| 35 | * 0.99 0.99 98 2.0.99
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| 36 | * 0.99a-m 0.99 99 2.0.99
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| 37 | * 1.00 1.00 100 2.1.0 [100 should be 10000]
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| 38 | * 1.0.0 (from here on, the 100 2.1.0 [100 should be 10000]
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| 39 | * 1.0.1 png.h string is 10001 2.1.0
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| 40 | * 1.0.1a-e identical to the 10002 from here on, the shared library
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| 41 | * 1.0.2 source version) 10002 is 2.V where V is the source code
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| 42 | * 1.0.2a-b 10003 version, except as noted.
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| 43 | * 1.0.3 10003
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| 44 | * 1.0.3a-d 10004
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| 45 | * 1.0.4 10004
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| 46 | * 1.0.4a-f 10005
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| 47 | * 1.0.5 (+ 2 patches) 10005
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| 48 | * 1.0.5a-d 10006
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| 49 | * 1.0.5e-r 10100 (not source compatible)
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| 50 | * 1.0.5s-v 10006 (not binary compatible)
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| 51 | * 1.0.6 (+ 3 patches) 10006 (still binary incompatible)
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| 52 | * 1.0.6d-f 10007 (still binary incompatible)
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| 53 | * 1.0.6g 10007
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| 54 | * 1.0.6h 10007 10.6h (testing xy.z so-numbering)
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| 55 | * 1.0.6i 10007 10.6i
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| 56 | * 1.0.6j 10007 2.1.0.6j (incompatible with 1.0.0)
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| 57 | * 1.0.7beta11-14 DLLNUM 10007 2.1.0.7beta11-14 (binary compatible)
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| 58 | * 1.0.7beta15-18 1 10007 2.1.0.7beta15-18 (binary compatible)
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| 59 | * 1.0.7rc1-2 1 10007 2.1.0.7rc1-2 (binary compatible)
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| 60 | * 1.0.7 1 10007 (still compatible)
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| 61 | * 1.0.8beta1-4 1 10008 2.1.0.8beta1-4
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| 62 | * 1.0.8rc1 1 10008 2.1.0.8rc1
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| 63 | * 1.0.8 1 10008 2.1.0.8
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| 64 | * 1.0.9beta1-6 1 10009 2.1.0.9beta1-6
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| 65 | * 1.0.9rc1 1 10009 2.1.0.9rc1
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| 66 | * 1.0.9beta7-10 1 10009 2.1.0.9beta7-10
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| 67 | * 1.0.9rc2 1 10009 2.1.0.9rc2
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| 68 | * 1.0.9 1 10009 2.1.0.9
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| 69 | * 1.0.10beta1 1 10010 2.1.0.10beta1
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| 70 | * 1.0.10rc1 1 10010 2.1.0.10rc1
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| 71 | * 1.0.10 1 10010 2.1.0.10
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| 72 | * 1.0.11beta1-3 1 10011 2.1.0.11beta1-3
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| 73 | * 1.0.11rc1 1 10011 2.1.0.11rc1
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| 74 | * 1.0.11 1 10011 2.1.0.11
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| 75 | * 1.0.12beta1-2 2 10012 2.1.0.12beta1-2
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| 76 | * 1.0.12rc1 2 10012 2.1.0.12rc1
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| 77 | * 1.0.12 2 10012 2.1.0.12
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| 78 | * 1.1.0a-f - 10100 2.1.1.0a-f (branch abandoned)
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| 79 | * 1.2.0beta1-2 2 10200 2.1.2.0beta1-2
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| 80 | * 1.2.0beta3-5 3 10200 3.1.2.0beta3-5
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| 81 | * 1.2.0rc1 3 10200 3.1.2.0rc1
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| 82 | * 1.2.0 3 10200 3.1.2.0
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| 83 | * 1.2.1beta1-4 3 10201 3.1.2.1beta1-4
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| 84 | * 1.2.1rc1-2 3 10201 3.1.2.1rc1-2
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| 85 | * 1.2.1 3 10201 3.1.2.1
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| 86 | * 1.2.2beta1-6 12 10202 12.so.0.1.2.2beta1-6
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| 87 | * 1.0.13beta1 10 10013 10.so.0.1.0.13beta1
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| 88 | * 1.0.13rc1 10 10013 10.so.0.1.0.13rc1
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| 89 | * 1.2.2rc1 12 10202 12.so.0.1.2.2rc1
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| 90 | * 1.0.13 10 10013 10.so.0.1.0.13
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| 91 | * 1.2.2 12 10202 12.so.0.1.2.2
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| 92 | * 1.2.3rc1-6 12 10203 12.so.0.1.2.3rc1-6
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| 93 | * 1.2.3 12 10203 12.so.0.1.2.3
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| 94 | * 1.2.4beta1-3 13 10204 12.so.0.1.2.4beta1-3
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| 95 | * 1.0.14rc1 13 10014 10.so.0.1.0.14rc1
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| 96 | * 1.2.4rc1 13 10204 12.so.0.1.2.4rc1
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| 97 | * 1.0.14 10 10014 10.so.0.1.0.14
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| 98 | * 1.2.4 13 10204 12.so.0.1.2.4
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| 99 | * 1.2.5beta1-2 13 10205 12.so.0.1.2.5beta1-2
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| 100 | * 1.0.15rc1-3 10 10015 10.so.0.1.0.15rc1-3
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| 101 | * 1.2.5rc1-3 13 10205 12.so.0.1.2.5rc1-3
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| 102 | * 1.0.15 10 10015 10.so.0.1.0.15
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| 103 | * 1.2.5 13 10205 12.so.0.1.2.5
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| 104 | * 1.2.6beta1-4 13 10206 12.so.0.1.2.6beta1-4
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| 105 | * 1.0.16 10 10016 10.so.0.1.0.16
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| 106 | * 1.2.6 13 10206 12.so.0.1.2.6
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| 107 | * 1.2.7beta1-2 13 10207 12.so.0.1.2.7beta1-2
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| 108 | * 1.0.17rc1 10 10017 12.so.0.1.0.17rc1
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| 109 | * 1.2.7rc1 13 10207 12.so.0.1.2.7rc1
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| 110 | * 1.0.17 10 10017 12.so.0.1.0.17
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| 111 | * 1.2.7 13 10207 12.so.0.1.2.7
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| 112 | * 1.2.8beta1-5 13 10208 12.so.0.1.2.8beta1-5
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| 113 | * 1.0.18rc1-5 10 10018 12.so.0.1.0.18rc1-5
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| 114 | * 1.2.8rc1-5 13 10208 12.so.0.1.2.8rc1-5
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| 115 | * 1.0.18 10 10018 12.so.0.1.0.18
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| 116 | * 1.2.8 13 10208 12.so.0.1.2.8
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| 117 | * 1.2.9beta1-3 13 10209 12.so.0.1.2.9beta1-3
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| 118 | * 1.2.9beta4-11 13 10209 12.so.0.9[.0]
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| 119 | * 1.2.9rc1 13 10209 12.so.0.9[.0]
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| 120 | * 1.2.9 13 10209 12.so.0.9[.0]
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| 121 | * 1.2.10beta1-7 13 10210 12.so.0.10[.0]
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| 122 | * 1.2.10rc1-2 13 10210 12.so.0.10[.0]
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| 123 | * 1.2.10 13 10210 12.so.0.10[.0]
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| 124 | * 1.4.0beta1-5 14 10400 14.so.0.0[.0]
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| 125 | * 1.2.11beta1-4 13 10211 12.so.0.11[.0]
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| 126 | * 1.4.0beta7-8 14 10400 14.so.0.0[.0]
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| 127 | * 1.2.11 13 10211 12.so.0.11[.0]
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| 128 | * 1.2.12 13 10212 12.so.0.12[.0]
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| 129 | * 1.4.0beta9-14 14 10400 14.so.0.0[.0]
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| 130 | * 1.2.13 13 10213 12.so.0.13[.0]
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| 131 | * 1.4.0beta15-36 14 10400 14.so.0.0[.0]
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| 132 | * 1.4.0beta37-87 14 10400 14.so.14.0[.0]
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| 133 | * 1.4.0rc01 14 10400 14.so.14.0[.0]
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| 134 | * 1.4.0beta88-109 14 10400 14.so.14.0[.0]
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| 135 | * 1.4.0rc02-08 14 10400 14.so.14.0[.0]
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| 136 | * 1.4.0 14 10400 14.so.14.0[.0]
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| 137 | *
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| 138 | * Henceforth the source version will match the shared-library major
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| 139 | * and minor numbers; the shared-library major version number will be
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| 140 | * used for changes in backward compatibility, as it is intended. The
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| 141 | * PNG_LIBPNG_VER macro, which is not used within libpng but is available
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| 142 | * for applications, is an unsigned integer of the form xyyzz corresponding
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| 143 | * to the source version x.y.z (leading zeros in y and z). Beta versions
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| 144 | * were given the previous public release number plus a letter, until
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| 145 | * version 1.0.6j; from then on they were given the upcoming public
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| 146 | * release number plus "betaNN" or "rcN".
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| 147 | *
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| 148 | * Binary incompatibility exists only when applications make direct access
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| 149 | * to the info_ptr or png_ptr members through png.h, and the compiled
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| 150 | * application is loaded with a different version of the library.
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| 151 | *
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| 152 | * DLLNUM will change each time there are forward or backward changes
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| 153 | * in binary compatibility (e.g., when a new feature is added).
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| 154 | *
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| 155 | * See libpng.txt or libpng.3 for more information. The PNG specification
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| 156 | * is available as a W3C Recommendation and as an ISO Specification,
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| 157 | * <http://www.w3.org/TR/2003/REC-PNG-20031110/
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| 158 | */
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| 159 |
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| 160 | /*
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| 161 | * COPYRIGHT NOTICE, DISCLAIMER, and LICENSE:
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| 162 | *
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| 163 | * If you modify libpng you may insert additional notices immediately following
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| 164 | * this sentence.
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| 165 | *
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| 166 | * This code is released under the libpng license.
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| 167 | *
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| 168 | * libpng versions 1.2.6, August 15, 2004, through 1.4.0, January 3, 2010, are
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| 169 | * Copyright (c) 2004, 2006-2010 Glenn Randers-Pehrson, and are
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| 170 | * distributed according to the same disclaimer and license as libpng-1.2.5
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| 171 | * with the following individual added to the list of Contributing Authors:
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| 172 | *
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| 173 | * Cosmin Truta
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| 174 | *
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| 175 | * libpng versions 1.0.7, July 1, 2000, through 1.2.5, October 3, 2002, are
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| 176 | * Copyright (c) 2000-2002 Glenn Randers-Pehrson, and are
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| 177 | * distributed according to the same disclaimer and license as libpng-1.0.6
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| 178 | * with the following individuals added to the list of Contributing Authors:
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| 179 | *
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| 180 | * Simon-Pierre Cadieux
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| 181 | * Eric S. Raymond
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| 182 | * Gilles Vollant
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| 183 | *
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| 184 | * and with the following additions to the disclaimer:
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| 185 | *
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| 186 | * There is no warranty against interference with your enjoyment of the
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| 187 | * library or against infringement. There is no warranty that our
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| 188 | * efforts or the library will fulfill any of your particular purposes
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| 189 | * or needs. This library is provided with all faults, and the entire
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| 190 | * risk of satisfactory quality, performance, accuracy, and effort is with
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| 191 | * the user.
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| 192 | *
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| 193 | * libpng versions 0.97, January 1998, through 1.0.6, March 20, 2000, are
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| 194 | * Copyright (c) 1998, 1999, 2000 Glenn Randers-Pehrson, and are
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| 195 | * distributed according to the same disclaimer and license as libpng-0.96,
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| 196 | * with the following individuals added to the list of Contributing Authors:
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| 197 | *
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| 198 | * Tom Lane
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| 199 | * Glenn Randers-Pehrson
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| 200 | * Willem van Schaik
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| 201 | *
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| 202 | * libpng versions 0.89, June 1996, through 0.96, May 1997, are
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| 203 | * Copyright (c) 1996, 1997 Andreas Dilger
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| 204 | * Distributed according to the same disclaimer and license as libpng-0.88,
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| 205 | * with the following individuals added to the list of Contributing Authors:
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| 206 | *
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| 207 | * John Bowler
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| 208 | * Kevin Bracey
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| 209 | * Sam Bushell
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| 210 | * Magnus Holmgren
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| 211 | * Greg Roelofs
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| 212 | * Tom Tanner
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| 213 | *
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| 214 | * libpng versions 0.5, May 1995, through 0.88, January 1996, are
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| 215 | * Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.
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| 216 | *
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| 217 | * For the purposes of this copyright and license, "Contributing Authors"
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| 218 | * is defined as the following set of individuals:
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| 219 | *
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| 220 | * Andreas Dilger
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| 221 | * Dave Martindale
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| 222 | * Guy Eric Schalnat
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| 223 | * Paul Schmidt
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| 224 | * Tim Wegner
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| 225 | *
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| 226 | * The PNG Reference Library is supplied "AS IS". The Contributing Authors
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| 227 | * and Group 42, Inc. disclaim all warranties, expressed or implied,
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| 228 | * including, without limitation, the warranties of merchantability and of
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| 229 | * fitness for any purpose. The Contributing Authors and Group 42, Inc.
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| 230 | * assume no liability for direct, indirect, incidental, special, exemplary,
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| 231 | * or consequential damages, which may result from the use of the PNG
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| 232 | * Reference Library, even if advised of the possibility of such damage.
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| 233 | *
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| 234 | * Permission is hereby granted to use, copy, modify, and distribute this
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| 235 | * source code, or portions hereof, for any purpose, without fee, subject
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| 236 | * to the following restrictions:
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| 237 | *
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| 238 | * 1. The origin of this source code must not be misrepresented.
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| 239 | *
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| 240 | * 2. Altered versions must be plainly marked as such and
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| 241 | * must not be misrepresented as being the original source.
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| 242 | *
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| 243 | * 3. This Copyright notice may not be removed or altered from
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| 244 | * any source or altered source distribution.
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| 245 | *
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| 246 | * The Contributing Authors and Group 42, Inc. specifically permit, without
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| 247 | * fee, and encourage the use of this source code as a component to
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| 248 | * supporting the PNG file format in commercial products. If you use this
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| 249 | * source code in a product, acknowledgment is not required but would be
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| 250 | * appreciated.
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| 251 | */
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| 252 |
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| 253 | /*
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| 254 | * A "png_get_copyright" function is available, for convenient use in "about"
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| 255 | * boxes and the like:
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| 256 | *
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| 257 | * printf("%s",png_get_copyright(NULL));
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| 258 | *
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| 259 | * Also, the PNG logo (in PNG format, of course) is supplied in the
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| 260 | * files "pngbar.png" and "pngbar.jpg (88x31) and "pngnow.png" (98x31).
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| 261 | */
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| 262 |
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| 263 | /*
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| 264 | * Libpng is OSI Certified Open Source Software. OSI Certified is a
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| 265 | * certification mark of the Open Source Initiative.
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| 266 | */
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| 267 |
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| 268 | /*
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| 269 | * The contributing authors would like to thank all those who helped
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| 270 | * with testing, bug fixes, and patience. This wouldn't have been
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| 271 | * possible without all of you.
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| 272 | *
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| 273 | * Thanks to Frank J. T. Wojcik for helping with the documentation.
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| 274 | */
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| 275 |
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| 276 | /*
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| 277 | * Y2K compliance in libpng:
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| 278 | * =========================
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| 279 | *
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| 280 | * January 3, 2010
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| 281 | *
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| 282 | * Since the PNG Development group is an ad-hoc body, we can't make
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| 283 | * an official declaration.
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| 284 | *
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| 285 | * This is your unofficial assurance that libpng from version 0.71 and
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| 286 | * upward through 1.4.0 are Y2K compliant. It is my belief that earlier
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| 287 | * versions were also Y2K compliant.
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| 288 | *
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| 289 | * Libpng only has three year fields. One is a 2-byte unsigned integer
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| 290 | * that will hold years up to 65535. The other two hold the date in text
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| 291 | * format, and will hold years up to 9999.
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| 292 | *
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| 293 | * The integer is
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| 294 | * "png_uint_16 year" in png_time_struct.
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| 295 | *
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| 296 | * The strings are
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| 297 | * "png_charp time_buffer" in png_struct and
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| 298 | * "near_time_buffer", which is a local character string in png.c.
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| 299 | *
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| 300 | * There are seven time-related functions:
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| 301 | * png.c: png_convert_to_rfc_1123() in png.c
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| 302 | * (formerly png_convert_to_rfc_1152() in error)
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| 303 | * png_convert_from_struct_tm() in pngwrite.c, called in pngwrite.c
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| 304 | * png_convert_from_time_t() in pngwrite.c
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| 305 | * png_get_tIME() in pngget.c
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| 306 | * png_handle_tIME() in pngrutil.c, called in pngread.c
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| 307 | * png_set_tIME() in pngset.c
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| 308 | * png_write_tIME() in pngwutil.c, called in pngwrite.c
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| 309 | *
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| 310 | * All handle dates properly in a Y2K environment. The
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| 311 | * png_convert_from_time_t() function calls gmtime() to convert from system
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| 312 | * clock time, which returns (year - 1900), which we properly convert to
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| 313 | * the full 4-digit year. There is a possibility that applications using
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| 314 | * libpng are not passing 4-digit years into the png_convert_to_rfc_1123()
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| 315 | * function, or that they are incorrectly passing only a 2-digit year
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| 316 | * instead of "year - 1900" into the png_convert_from_struct_tm() function,
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| 317 | * but this is not under our control. The libpng documentation has always
|
|---|
| 318 | * stated that it works with 4-digit years, and the APIs have been
|
|---|
| 319 | * documented as such.
|
|---|
| 320 | *
|
|---|
| 321 | * The tIME chunk itself is also Y2K compliant. It uses a 2-byte unsigned
|
|---|
| 322 | * integer to hold the year, and can hold years as large as 65535.
|
|---|
| 323 | *
|
|---|
| 324 | * zlib, upon which libpng depends, is also Y2K compliant. It contains
|
|---|
| 325 | * no date-related code.
|
|---|
| 326 | *
|
|---|
| 327 | * Glenn Randers-Pehrson
|
|---|
| 328 | * libpng maintainer
|
|---|
| 329 | * PNG Development Group
|
|---|
| 330 | */
|
|---|
| 331 |
|
|---|
| 332 | #ifndef PNG_H
|
|---|
| 333 | #define PNG_H
|
|---|
| 334 |
|
|---|
| 335 | /* This is not the place to learn how to use libpng. The file libpng.txt
|
|---|
| 336 | * describes how to use libpng, and the file example.c summarizes it
|
|---|
| 337 | * with some code on which to build. This file is useful for looking
|
|---|
| 338 | * at the actual function definitions and structure components.
|
|---|
| 339 | */
|
|---|
| 340 |
|
|---|
| 341 | /* Version information for png.h - this should match the version in png.c */
|
|---|
| 342 | #define PNG_LIBPNG_VER_STRING "1.4.0"
|
|---|
| 343 | #define PNG_HEADER_VERSION_STRING \
|
|---|
| 344 | " libpng version 1.4.0 - January 3, 2010\n"
|
|---|
| 345 |
|
|---|
| 346 | #define PNG_LIBPNG_VER_SONUM 14
|
|---|
| 347 | #define PNG_LIBPNG_VER_DLLNUM 14
|
|---|
| 348 |
|
|---|
| 349 | /* These should match the first 3 components of PNG_LIBPNG_VER_STRING: */
|
|---|
| 350 | #define PNG_LIBPNG_VER_MAJOR 1
|
|---|
| 351 | #define PNG_LIBPNG_VER_MINOR 4
|
|---|
| 352 | #define PNG_LIBPNG_VER_RELEASE 0
|
|---|
| 353 | /* This should match the numeric part of the final component of
|
|---|
| 354 | * PNG_LIBPNG_VER_STRING, omitting any leading zero:
|
|---|
| 355 | */
|
|---|
| 356 |
|
|---|
| 357 | #define PNG_LIBPNG_VER_BUILD 0
|
|---|
| 358 |
|
|---|
| 359 | /* Release Status */
|
|---|
| 360 | #define PNG_LIBPNG_BUILD_ALPHA 1
|
|---|
| 361 | #define PNG_LIBPNG_BUILD_BETA 2
|
|---|
| 362 | #define PNG_LIBPNG_BUILD_RC 3
|
|---|
| 363 | #define PNG_LIBPNG_BUILD_STABLE 4
|
|---|
| 364 | #define PNG_LIBPNG_BUILD_RELEASE_STATUS_MASK 7
|
|---|
| 365 |
|
|---|
| 366 | /* Release-Specific Flags */
|
|---|
| 367 | #define PNG_LIBPNG_BUILD_PATCH 8 /* Can be OR'ed with
|
|---|
| 368 | PNG_LIBPNG_BUILD_STABLE only */
|
|---|
| 369 | #define PNG_LIBPNG_BUILD_PRIVATE 16 /* Cannot be OR'ed with
|
|---|
| 370 | PNG_LIBPNG_BUILD_SPECIAL */
|
|---|
| 371 | #define PNG_LIBPNG_BUILD_SPECIAL 32 /* Cannot be OR'ed with
|
|---|
| 372 | PNG_LIBPNG_BUILD_PRIVATE */
|
|---|
| 373 |
|
|---|
| 374 | #define PNG_LIBPNG_BUILD_BASE_TYPE PNG_LIBPNG_BUILD_BETA
|
|---|
| 375 |
|
|---|
| 376 | /* Careful here. At one time, Guy wanted to use 082, but that would be octal.
|
|---|
| 377 | * We must not include leading zeros.
|
|---|
| 378 | * Versions 0.7 through 1.0.0 were in the range 0 to 100 here (only
|
|---|
| 379 | * version 1.0.0 was mis-numbered 100 instead of 10000). From
|
|---|
| 380 | * version 1.0.1 it's xxyyzz, where x=major, y=minor, z=release
|
|---|
| 381 | */
|
|---|
| 382 | #define PNG_LIBPNG_VER 10400 /* 1.4.0 */
|
|---|
| 383 |
|
|---|
| 384 | #ifndef PNG_VERSION_INFO_ONLY
|
|---|
| 385 | /* Include the compression library's header */
|
|---|
| 386 | #include "zlib.h"
|
|---|
| 387 | #endif
|
|---|
| 388 |
|
|---|
| 389 | #ifdef _AIX
|
|---|
| 390 | #define jmpbuf __jmpbuf
|
|---|
| 391 | #endif
|
|---|
| 392 |
|
|---|
| 393 | /* Include all user configurable info, including optional assembler routines */
|
|---|
| 394 | #include "pngconf.h"
|
|---|
| 395 |
|
|---|
| 396 | /*
|
|---|
| 397 | * Added at libpng-1.2.8
|
|---|
| 398 | *
|
|---|
| 399 | * Ref MSDN: Private as priority over Special
|
|---|
| 400 | * VS_FF_PRIVATEBUILD File *was not* built using standard release
|
|---|
| 401 | * procedures. If this value is given, the StringFileInfo block must
|
|---|
| 402 | * contain a PrivateBuild string.
|
|---|
| 403 | *
|
|---|
| 404 | * VS_FF_SPECIALBUILD File *was* built by the original company using
|
|---|
| 405 | * standard release procedures but is a variation of the standard
|
|---|
| 406 | * file of the same version number. If this value is given, the
|
|---|
| 407 | * StringFileInfo block must contain a SpecialBuild string.
|
|---|
| 408 | */
|
|---|
| 409 |
|
|---|
| 410 | #ifdef PNG_USER_PRIVATEBUILD
|
|---|
| 411 | # define PNG_LIBPNG_BUILD_TYPE \
|
|---|
| 412 | (PNG_LIBPNG_BUILD_BASE_TYPE | PNG_LIBPNG_BUILD_PRIVATE)
|
|---|
| 413 | #else
|
|---|
| 414 | # ifdef PNG_LIBPNG_SPECIALBUILD
|
|---|
| 415 | # define PNG_LIBPNG_BUILD_TYPE \
|
|---|
| 416 | (PNG_LIBPNG_BUILD_BASE_TYPE | PNG_LIBPNG_BUILD_SPECIAL)
|
|---|
| 417 | # else
|
|---|
| 418 | # define PNG_LIBPNG_BUILD_TYPE (PNG_LIBPNG_BUILD_BASE_TYPE)
|
|---|
| 419 | # endif
|
|---|
| 420 | #endif
|
|---|
| 421 |
|
|---|
| 422 | #ifndef PNG_VERSION_INFO_ONLY
|
|---|
| 423 |
|
|---|
| 424 | /* Inhibit C++ name-mangling for libpng functions but not for system calls. */
|
|---|
| 425 | #ifdef __cplusplus
|
|---|
| 426 | extern "C" {
|
|---|
| 427 | #endif /* __cplusplus */
|
|---|
| 428 |
|
|---|
| 429 | /* This file is arranged in several sections. The first section contains
|
|---|
| 430 | * structure and type definitions. The second section contains the external
|
|---|
| 431 | * library functions, while the third has the internal library functions,
|
|---|
| 432 | * which applications aren't expected to use directly.
|
|---|
| 433 | */
|
|---|
| 434 |
|
|---|
| 435 | /* Variables declared in png.c - only it needs to define PNG_NO_EXTERN */
|
|---|
| 436 | #if !defined(PNG_NO_EXTERN) || defined(PNG_ALWAYS_EXTERN)
|
|---|
| 437 | /* Version information for C files, stored in png.c. This had better match
|
|---|
| 438 | * the version above.
|
|---|
| 439 | */
|
|---|
| 440 | #define png_libpng_ver png_get_header_ver(NULL)
|
|---|
| 441 |
|
|---|
| 442 | #endif /* PNG_NO_EXTERN */
|
|---|
| 443 |
|
|---|
| 444 | /* Three color definitions. The order of the red, green, and blue, (and the
|
|---|
| 445 | * exact size) is not important, although the size of the fields need to
|
|---|
| 446 | * be png_byte or png_uint_16 (as defined below).
|
|---|
| 447 | */
|
|---|
| 448 | typedef struct png_color_struct
|
|---|
| 449 | {
|
|---|
| 450 | png_byte red;
|
|---|
| 451 | png_byte green;
|
|---|
| 452 | png_byte blue;
|
|---|
| 453 | } png_color;
|
|---|
| 454 | typedef png_color FAR * png_colorp;
|
|---|
| 455 | typedef png_color FAR * FAR * png_colorpp;
|
|---|
| 456 |
|
|---|
| 457 | typedef struct png_color_16_struct
|
|---|
| 458 | {
|
|---|
| 459 | png_byte index; /* used for palette files */
|
|---|
| 460 | png_uint_16 red; /* for use in red green blue files */
|
|---|
| 461 | png_uint_16 green;
|
|---|
| 462 | png_uint_16 blue;
|
|---|
| 463 | png_uint_16 gray; /* for use in grayscale files */
|
|---|
| 464 | } png_color_16;
|
|---|
| 465 | typedef png_color_16 FAR * png_color_16p;
|
|---|
| 466 | typedef png_color_16 FAR * FAR * png_color_16pp;
|
|---|
| 467 |
|
|---|
| 468 | typedef struct png_color_8_struct
|
|---|
| 469 | {
|
|---|
| 470 | png_byte red; /* for use in red green blue files */
|
|---|
| 471 | png_byte green;
|
|---|
| 472 | png_byte blue;
|
|---|
| 473 | png_byte gray; /* for use in grayscale files */
|
|---|
| 474 | png_byte alpha; /* for alpha channel files */
|
|---|
| 475 | } png_color_8;
|
|---|
| 476 | typedef png_color_8 FAR * png_color_8p;
|
|---|
| 477 | typedef png_color_8 FAR * FAR * png_color_8pp;
|
|---|
| 478 |
|
|---|
| 479 | /*
|
|---|
| 480 | * The following two structures are used for the in-core representation
|
|---|
| 481 | * of sPLT chunks.
|
|---|
| 482 | */
|
|---|
| 483 | typedef struct png_sPLT_entry_struct
|
|---|
| 484 | {
|
|---|
| 485 | png_uint_16 red;
|
|---|
| 486 | png_uint_16 green;
|
|---|
| 487 | png_uint_16 blue;
|
|---|
| 488 | png_uint_16 alpha;
|
|---|
| 489 | png_uint_16 frequency;
|
|---|
| 490 | } png_sPLT_entry;
|
|---|
| 491 | typedef png_sPLT_entry FAR * png_sPLT_entryp;
|
|---|
| 492 | typedef png_sPLT_entry FAR * FAR * png_sPLT_entrypp;
|
|---|
| 493 |
|
|---|
| 494 | /* When the depth of the sPLT palette is 8 bits, the color and alpha samples
|
|---|
| 495 | * occupy the LSB of their respective members, and the MSB of each member
|
|---|
| 496 | * is zero-filled. The frequency member always occupies the full 16 bits.
|
|---|
| 497 | */
|
|---|
| 498 |
|
|---|
| 499 | typedef struct png_sPLT_struct
|
|---|
| 500 | {
|
|---|
| 501 | png_charp name; /* palette name */
|
|---|
| 502 | png_byte depth; /* depth of palette samples */
|
|---|
| 503 | png_sPLT_entryp entries; /* palette entries */
|
|---|
| 504 | png_int_32 nentries; /* number of palette entries */
|
|---|
| 505 | } png_sPLT_t;
|
|---|
| 506 | typedef png_sPLT_t FAR * png_sPLT_tp;
|
|---|
| 507 | typedef png_sPLT_t FAR * FAR * png_sPLT_tpp;
|
|---|
| 508 |
|
|---|
| 509 | #ifdef PNG_TEXT_SUPPORTED
|
|---|
| 510 | /* png_text holds the contents of a text/ztxt/itxt chunk in a PNG file,
|
|---|
| 511 | * and whether that contents is compressed or not. The "key" field
|
|---|
| 512 | * points to a regular zero-terminated C string. The "text", "lang", and
|
|---|
| 513 | * "lang_key" fields can be regular C strings, empty strings, or NULL pointers.
|
|---|
| 514 | * However, the * structure returned by png_get_text() will always contain
|
|---|
| 515 | * regular zero-terminated C strings (possibly empty), never NULL pointers,
|
|---|
| 516 | * so they can be safely used in printf() and other string-handling functions.
|
|---|
| 517 | */
|
|---|
| 518 | typedef struct png_text_struct
|
|---|
| 519 | {
|
|---|
| 520 | int compression; /* compression value:
|
|---|
| 521 | -1: tEXt, none
|
|---|
| 522 | 0: zTXt, deflate
|
|---|
| 523 | 1: iTXt, none
|
|---|
| 524 | 2: iTXt, deflate */
|
|---|
| 525 | png_charp key; /* keyword, 1-79 character description of "text" */
|
|---|
| 526 | png_charp text; /* comment, may be an empty string (ie "")
|
|---|
| 527 | or a NULL pointer */
|
|---|
| 528 | png_size_t text_length; /* length of the text string */
|
|---|
| 529 | #ifdef PNG_iTXt_SUPPORTED
|
|---|
| 530 | png_size_t itxt_length; /* length of the itxt string */
|
|---|
| 531 | png_charp lang; /* language code, 0-79 characters
|
|---|
| 532 | or a NULL pointer */
|
|---|
| 533 | png_charp lang_key; /* keyword translated UTF-8 string, 0 or more
|
|---|
| 534 | chars or a NULL pointer */
|
|---|
| 535 | #endif
|
|---|
| 536 | } png_text;
|
|---|
| 537 | typedef png_text FAR * png_textp;
|
|---|
| 538 | typedef png_text FAR * FAR * png_textpp;
|
|---|
| 539 | #endif
|
|---|
| 540 |
|
|---|
| 541 | /* Supported compression types for text in PNG files (tEXt, and zTXt).
|
|---|
| 542 | * The values of the PNG_TEXT_COMPRESSION_ defines should NOT be changed. */
|
|---|
| 543 | #define PNG_TEXT_COMPRESSION_NONE_WR -3
|
|---|
| 544 | #define PNG_TEXT_COMPRESSION_zTXt_WR -2
|
|---|
| 545 | #define PNG_TEXT_COMPRESSION_NONE -1
|
|---|
| 546 | #define PNG_TEXT_COMPRESSION_zTXt 0
|
|---|
| 547 | #define PNG_ITXT_COMPRESSION_NONE 1
|
|---|
| 548 | #define PNG_ITXT_COMPRESSION_zTXt 2
|
|---|
| 549 | #define PNG_TEXT_COMPRESSION_LAST 3 /* Not a valid value */
|
|---|
| 550 |
|
|---|
| 551 | /* png_time is a way to hold the time in an machine independent way.
|
|---|
| 552 | * Two conversions are provided, both from time_t and struct tm. There
|
|---|
| 553 | * is no portable way to convert to either of these structures, as far
|
|---|
| 554 | * as I know. If you know of a portable way, send it to me. As a side
|
|---|
| 555 | * note - PNG has always been Year 2000 compliant!
|
|---|
| 556 | */
|
|---|
| 557 | typedef struct png_time_struct
|
|---|
| 558 | {
|
|---|
| 559 | png_uint_16 year; /* full year, as in, 1995 */
|
|---|
| 560 | png_byte month; /* month of year, 1 - 12 */
|
|---|
| 561 | png_byte day; /* day of month, 1 - 31 */
|
|---|
| 562 | png_byte hour; /* hour of day, 0 - 23 */
|
|---|
| 563 | png_byte minute; /* minute of hour, 0 - 59 */
|
|---|
| 564 | png_byte second; /* second of minute, 0 - 60 (for leap seconds) */
|
|---|
| 565 | } png_time;
|
|---|
| 566 | typedef png_time FAR * png_timep;
|
|---|
| 567 | typedef png_time FAR * FAR * png_timepp;
|
|---|
| 568 |
|
|---|
| 569 | #if defined(PNG_UNKNOWN_CHUNKS_SUPPORTED) || \
|
|---|
| 570 | defined(PNG_HANDLE_AS_UNKNOWN_SUPPORTED)
|
|---|
| 571 | /* png_unknown_chunk is a structure to hold queued chunks for which there is
|
|---|
| 572 | * no specific support. The idea is that we can use this to queue
|
|---|
| 573 | * up private chunks for output even though the library doesn't actually
|
|---|
| 574 | * know about their semantics.
|
|---|
| 575 | */
|
|---|
| 576 | typedef struct png_unknown_chunk_t
|
|---|
| 577 | {
|
|---|
| 578 | png_byte name[5];
|
|---|
| 579 | png_byte *data;
|
|---|
| 580 | png_size_t size;
|
|---|
| 581 |
|
|---|
| 582 | /* libpng-using applications should NOT directly modify this byte. */
|
|---|
| 583 | png_byte location; /* mode of operation at read time */
|
|---|
| 584 | }
|
|---|
| 585 | png_unknown_chunk;
|
|---|
| 586 | typedef png_unknown_chunk FAR * png_unknown_chunkp;
|
|---|
| 587 | typedef png_unknown_chunk FAR * FAR * png_unknown_chunkpp;
|
|---|
| 588 | #endif
|
|---|
| 589 |
|
|---|
| 590 | /* png_info is a structure that holds the information in a PNG file so
|
|---|
| 591 | * that the application can find out the characteristics of the image.
|
|---|
| 592 | * If you are reading the file, this structure will tell you what is
|
|---|
| 593 | * in the PNG file. If you are writing the file, fill in the information
|
|---|
| 594 | * you want to put into the PNG file, then call png_write_info().
|
|---|
| 595 | * The names chosen should be very close to the PNG specification, so
|
|---|
| 596 | * consult that document for information about the meaning of each field.
|
|---|
| 597 | *
|
|---|
| 598 | * With libpng < 0.95, it was only possible to directly set and read the
|
|---|
| 599 | * the values in the png_info_struct, which meant that the contents and
|
|---|
| 600 | * order of the values had to remain fixed. With libpng 0.95 and later,
|
|---|
| 601 | * however, there are now functions that abstract the contents of
|
|---|
| 602 | * png_info_struct from the application, so this makes it easier to use
|
|---|
| 603 | * libpng with dynamic libraries, and even makes it possible to use
|
|---|
| 604 | * libraries that don't have all of the libpng ancillary chunk-handing
|
|---|
| 605 | * functionality.
|
|---|
| 606 | *
|
|---|
| 607 | * In any case, the order of the parameters in png_info_struct should NOT
|
|---|
| 608 | * be changed for as long as possible to keep compatibility with applications
|
|---|
| 609 | * that use the old direct-access method with png_info_struct.
|
|---|
| 610 | *
|
|---|
| 611 | * The following members may have allocated storage attached that should be
|
|---|
| 612 | * cleaned up before the structure is discarded: palette, trans, text,
|
|---|
| 613 | * pcal_purpose, pcal_units, pcal_params, hist, iccp_name, iccp_profile,
|
|---|
| 614 | * splt_palettes, scal_unit, row_pointers, and unknowns. By default, these
|
|---|
| 615 | * are automatically freed when the info structure is deallocated, if they were
|
|---|
| 616 | * allocated internally by libpng. This behavior can be changed by means
|
|---|
| 617 | * of the png_data_freer() function.
|
|---|
| 618 | *
|
|---|
| 619 | * More allocation details: all the chunk-reading functions that
|
|---|
| 620 | * change these members go through the corresponding png_set_*
|
|---|
| 621 | * functions. A function to clear these members is available: see
|
|---|
| 622 | * png_free_data(). The png_set_* functions do not depend on being
|
|---|
| 623 | * able to point info structure members to any of the storage they are
|
|---|
| 624 | * passed (they make their own copies), EXCEPT that the png_set_text
|
|---|
| 625 | * functions use the same storage passed to them in the text_ptr or
|
|---|
| 626 | * itxt_ptr structure argument, and the png_set_rows and png_set_unknowns
|
|---|
| 627 | * functions do not make their own copies.
|
|---|
| 628 | */
|
|---|
| 629 | typedef struct png_info_struct
|
|---|
| 630 | {
|
|---|
| 631 | /* the following are necessary for every PNG file */
|
|---|
| 632 | png_uint_32 width PNG_DEPSTRUCT; /* width of image in pixels (from IHDR) */
|
|---|
| 633 | png_uint_32 height PNG_DEPSTRUCT; /* height of image in pixels (from IHDR) */
|
|---|
| 634 | png_uint_32 valid PNG_DEPSTRUCT; /* valid chunk data (see PNG_INFO_ below) */
|
|---|
| 635 | png_size_t rowbytes PNG_DEPSTRUCT; /* bytes needed to hold an untransformed row */
|
|---|
| 636 | png_colorp palette PNG_DEPSTRUCT; /* array of color values (valid & PNG_INFO_PLTE) */
|
|---|
| 637 | png_uint_16 num_palette PNG_DEPSTRUCT; /* number of color entries in "palette" (PLTE) */
|
|---|
| 638 | png_uint_16 num_trans PNG_DEPSTRUCT; /* number of transparent palette color (tRNS) */
|
|---|
| 639 | png_byte bit_depth PNG_DEPSTRUCT; /* 1, 2, 4, 8, or 16 bits/channel (from IHDR) */
|
|---|
| 640 | png_byte color_type PNG_DEPSTRUCT; /* see PNG_COLOR_TYPE_ below (from IHDR) */
|
|---|
| 641 | /* The following three should have been named *_method not *_type */
|
|---|
| 642 | png_byte compression_type PNG_DEPSTRUCT; /* must be PNG_COMPRESSION_TYPE_BASE (IHDR) */
|
|---|
| 643 | png_byte filter_type PNG_DEPSTRUCT; /* must be PNG_FILTER_TYPE_BASE (from IHDR) */
|
|---|
| 644 | png_byte interlace_type PNG_DEPSTRUCT; /* One of PNG_INTERLACE_NONE, PNG_INTERLACE_ADAM7 */
|
|---|
| 645 |
|
|---|
| 646 | /* The following is informational only on read, and not used on writes. */
|
|---|
| 647 | png_byte channels PNG_DEPSTRUCT; /* number of data channels per pixel (1, 2, 3, 4) */
|
|---|
| 648 | png_byte pixel_depth PNG_DEPSTRUCT; /* number of bits per pixel */
|
|---|
| 649 | png_byte spare_byte PNG_DEPSTRUCT; /* to align the data, and for future use */
|
|---|
| 650 | png_byte signature[8] PNG_DEPSTRUCT; /* magic bytes read by libpng from start of file */
|
|---|
| 651 |
|
|---|
| 652 | /* The rest of the data is optional. If you are reading, check the
|
|---|
| 653 | * valid field to see if the information in these are valid. If you
|
|---|
| 654 | * are writing, set the valid field to those chunks you want written,
|
|---|
| 655 | * and initialize the appropriate fields below.
|
|---|
| 656 | */
|
|---|
| 657 |
|
|---|
| 658 | #if defined(PNG_gAMA_SUPPORTED) && defined(PNG_FLOATING_POINT_SUPPORTED)
|
|---|
| 659 | /* The gAMA chunk describes the gamma characteristics of the system
|
|---|
| 660 | * on which the image was created, normally in the range [1.0, 2.5].
|
|---|
| 661 | * Data is valid if (valid & PNG_INFO_gAMA) is non-zero.
|
|---|
| 662 | */
|
|---|
| 663 | float gamma PNG_DEPSTRUCT; /* gamma value of image, if (valid & PNG_INFO_gAMA) */
|
|---|
| 664 | #endif
|
|---|
| 665 |
|
|---|
| 666 | #ifdef PNG_sRGB_SUPPORTED
|
|---|
| 667 | /* GR-P, 0.96a */
|
|---|
| 668 | /* Data valid if (valid & PNG_INFO_sRGB) non-zero. */
|
|---|
| 669 | png_byte srgb_intent PNG_DEPSTRUCT; /* sRGB rendering intent [0, 1, 2, or 3] */
|
|---|
| 670 | #endif
|
|---|
| 671 |
|
|---|
| 672 | #ifdef PNG_TEXT_SUPPORTED
|
|---|
| 673 | /* The tEXt, and zTXt chunks contain human-readable textual data in
|
|---|
| 674 | * uncompressed, compressed, and optionally compressed forms, respectively.
|
|---|
| 675 | * The data in "text" is an array of pointers to uncompressed,
|
|---|
| 676 | * null-terminated C strings. Each chunk has a keyword that describes the
|
|---|
| 677 | * textual data contained in that chunk. Keywords are not required to be
|
|---|
| 678 | * unique, and the text string may be empty. Any number of text chunks may
|
|---|
| 679 | * be in an image.
|
|---|
| 680 | */
|
|---|
| 681 | int num_text PNG_DEPSTRUCT; /* number of comments read/to write */
|
|---|
| 682 | int max_text PNG_DEPSTRUCT; /* current size of text array */
|
|---|
| 683 | png_textp text PNG_DEPSTRUCT; /* array of comments read/to write */
|
|---|
| 684 | #endif /* PNG_TEXT_SUPPORTED */
|
|---|
| 685 |
|
|---|
| 686 | #ifdef PNG_tIME_SUPPORTED
|
|---|
| 687 | /* The tIME chunk holds the last time the displayed image data was
|
|---|
| 688 | * modified. See the png_time struct for the contents of this struct.
|
|---|
| 689 | */
|
|---|
| 690 | png_time mod_time PNG_DEPSTRUCT;
|
|---|
| 691 | #endif
|
|---|
| 692 |
|
|---|
| 693 | #ifdef PNG_sBIT_SUPPORTED
|
|---|
| 694 | /* The sBIT chunk specifies the number of significant high-order bits
|
|---|
| 695 | * in the pixel data. Values are in the range [1, bit_depth], and are
|
|---|
| 696 | * only specified for the channels in the pixel data. The contents of
|
|---|
| 697 | * the low-order bits is not specified. Data is valid if
|
|---|
| 698 | * (valid & PNG_INFO_sBIT) is non-zero.
|
|---|
| 699 | */
|
|---|
| 700 | png_color_8 sig_bit PNG_DEPSTRUCT; /* significant bits in color channels */
|
|---|
| 701 | #endif
|
|---|
| 702 |
|
|---|
| 703 | #if defined(PNG_tRNS_SUPPORTED) || defined(PNG_READ_EXPAND_SUPPORTED) || \
|
|---|
| 704 | defined(PNG_READ_BACKGROUND_SUPPORTED)
|
|---|
| 705 | /* The tRNS chunk supplies transparency data for paletted images and
|
|---|
| 706 | * other image types that don't need a full alpha channel. There are
|
|---|
| 707 | * "num_trans" transparency values for a paletted image, stored in the
|
|---|
| 708 | * same order as the palette colors, starting from index 0. Values
|
|---|
| 709 | * for the data are in the range [0, 255], ranging from fully transparent
|
|---|
| 710 | * to fully opaque, respectively. For non-paletted images, there is a
|
|---|
| 711 | * single color specified that should be treated as fully transparent.
|
|---|
| 712 | * Data is valid if (valid & PNG_INFO_tRNS) is non-zero.
|
|---|
| 713 | */
|
|---|
| 714 | png_bytep trans_alpha PNG_DEPSTRUCT; /* alpha values for paletted image */
|
|---|
| 715 | png_color_16 trans_color PNG_DEPSTRUCT; /* transparent color for non-palette image */
|
|---|
| 716 | #endif
|
|---|
| 717 |
|
|---|
| 718 | #if defined(PNG_bKGD_SUPPORTED) || defined(PNG_READ_BACKGROUND_SUPPORTED)
|
|---|
| 719 | /* The bKGD chunk gives the suggested image background color if the
|
|---|
| 720 | * display program does not have its own background color and the image
|
|---|
| 721 | * is needs to composited onto a background before display. The colors
|
|---|
| 722 | * in "background" are normally in the same color space/depth as the
|
|---|
| 723 | * pixel data. Data is valid if (valid & PNG_INFO_bKGD) is non-zero.
|
|---|
| 724 | */
|
|---|
| 725 | png_color_16 background PNG_DEPSTRUCT;
|
|---|
| 726 | #endif
|
|---|
| 727 |
|
|---|
| 728 | #ifdef PNG_oFFs_SUPPORTED
|
|---|
| 729 | /* The oFFs chunk gives the offset in "offset_unit_type" units rightwards
|
|---|
| 730 | * and downwards from the top-left corner of the display, page, or other
|
|---|
| 731 | * application-specific co-ordinate space. See the PNG_OFFSET_ defines
|
|---|
| 732 | * below for the unit types. Valid if (valid & PNG_INFO_oFFs) non-zero.
|
|---|
| 733 | */
|
|---|
| 734 | png_int_32 x_offset PNG_DEPSTRUCT; /* x offset on page */
|
|---|
| 735 | png_int_32 y_offset PNG_DEPSTRUCT; /* y offset on page */
|
|---|
| 736 | png_byte offset_unit_type PNG_DEPSTRUCT; /* offset units type */
|
|---|
| 737 | #endif
|
|---|
| 738 |
|
|---|
| 739 | #ifdef PNG_pHYs_SUPPORTED
|
|---|
| 740 | /* The pHYs chunk gives the physical pixel density of the image for
|
|---|
| 741 | * display or printing in "phys_unit_type" units (see PNG_RESOLUTION_
|
|---|
| 742 | * defines below). Data is valid if (valid & PNG_INFO_pHYs) is non-zero.
|
|---|
| 743 | */
|
|---|
| 744 | png_uint_32 x_pixels_per_unit PNG_DEPSTRUCT; /* horizontal pixel density */
|
|---|
| 745 | png_uint_32 y_pixels_per_unit PNG_DEPSTRUCT; /* vertical pixel density */
|
|---|
| 746 | png_byte phys_unit_type PNG_DEPSTRUCT; /* resolution type (see PNG_RESOLUTION_ below) */
|
|---|
| 747 | #endif
|
|---|
| 748 |
|
|---|
| 749 | #ifdef PNG_hIST_SUPPORTED
|
|---|
| 750 | /* The hIST chunk contains the relative frequency or importance of the
|
|---|
| 751 | * various palette entries, so that a viewer can intelligently select a
|
|---|
| 752 | * reduced-color palette, if required. Data is an array of "num_palette"
|
|---|
| 753 | * values in the range [0,65535]. Data valid if (valid & PNG_INFO_hIST)
|
|---|
| 754 | * is non-zero.
|
|---|
| 755 | */
|
|---|
| 756 | png_uint_16p hist PNG_DEPSTRUCT;
|
|---|
| 757 | #endif
|
|---|
| 758 |
|
|---|
| 759 | #ifdef PNG_cHRM_SUPPORTED
|
|---|
| 760 | /* The cHRM chunk describes the CIE color characteristics of the monitor
|
|---|
| 761 | * on which the PNG was created. This data allows the viewer to do gamut
|
|---|
| 762 | * mapping of the input image to ensure that the viewer sees the same
|
|---|
| 763 | * colors in the image as the creator. Values are in the range
|
|---|
| 764 | * [0.0, 0.8]. Data valid if (valid & PNG_INFO_cHRM) non-zero.
|
|---|
| 765 | */
|
|---|
| 766 | #ifdef PNG_FLOATING_POINT_SUPPORTED
|
|---|
| 767 | float x_white PNG_DEPSTRUCT;
|
|---|
| 768 | float y_white PNG_DEPSTRUCT;
|
|---|
| 769 | float x_red PNG_DEPSTRUCT;
|
|---|
| 770 | float y_red PNG_DEPSTRUCT;
|
|---|
| 771 | float x_green PNG_DEPSTRUCT;
|
|---|
| 772 | float y_green PNG_DEPSTRUCT;
|
|---|
| 773 | float x_blue PNG_DEPSTRUCT;
|
|---|
| 774 | float y_blue PNG_DEPSTRUCT;
|
|---|
| 775 | #endif
|
|---|
| 776 | #endif
|
|---|
| 777 |
|
|---|
| 778 | #ifdef PNG_pCAL_SUPPORTED
|
|---|
| 779 | /* The pCAL chunk describes a transformation between the stored pixel
|
|---|
| 780 | * values and original physical data values used to create the image.
|
|---|
| 781 | * The integer range [0, 2^bit_depth - 1] maps to the floating-point
|
|---|
| 782 | * range given by [pcal_X0, pcal_X1], and are further transformed by a
|
|---|
| 783 | * (possibly non-linear) transformation function given by "pcal_type"
|
|---|
| 784 | * and "pcal_params" into "pcal_units". Please see the PNG_EQUATION_
|
|---|
| 785 | * defines below, and the PNG-Group's PNG extensions document for a
|
|---|
| 786 | * complete description of the transformations and how they should be
|
|---|
| 787 | * implemented, and for a description of the ASCII parameter strings.
|
|---|
| 788 | * Data values are valid if (valid & PNG_INFO_pCAL) non-zero.
|
|---|
| 789 | */
|
|---|
| 790 | png_charp pcal_purpose PNG_DEPSTRUCT; /* pCAL chunk description string */
|
|---|
| 791 | png_int_32 pcal_X0 PNG_DEPSTRUCT; /* minimum value */
|
|---|
| 792 | png_int_32 pcal_X1 PNG_DEPSTRUCT; /* maximum value */
|
|---|
| 793 | png_charp pcal_units PNG_DEPSTRUCT; /* Latin-1 string giving physical units */
|
|---|
| 794 | png_charpp pcal_params PNG_DEPSTRUCT; /* ASCII strings containing parameter values */
|
|---|
| 795 | png_byte pcal_type PNG_DEPSTRUCT; /* equation type (see PNG_EQUATION_ below) */
|
|---|
| 796 | png_byte pcal_nparams PNG_DEPSTRUCT; /* number of parameters given in pcal_params */
|
|---|
| 797 | #endif
|
|---|
| 798 |
|
|---|
| 799 | /* New members added in libpng-1.0.6 */
|
|---|
| 800 | png_uint_32 free_me PNG_DEPSTRUCT; /* flags items libpng is responsible for freeing */
|
|---|
| 801 |
|
|---|
| 802 | #if defined(PNG_UNKNOWN_CHUNKS_SUPPORTED) || \
|
|---|
| 803 | defined(PNG_HANDLE_AS_UNKNOWN_SUPPORTED)
|
|---|
| 804 | /* Storage for unknown chunks that the library doesn't recognize. */
|
|---|
| 805 | png_unknown_chunkp unknown_chunks PNG_DEPSTRUCT;
|
|---|
| 806 | png_size_t unknown_chunks_num PNG_DEPSTRUCT;
|
|---|
| 807 | #endif
|
|---|
| 808 |
|
|---|
| 809 | #ifdef PNG_iCCP_SUPPORTED
|
|---|
| 810 | /* iCCP chunk data. */
|
|---|
| 811 | png_charp iccp_name PNG_DEPSTRUCT; /* profile name */
|
|---|
| 812 | png_charp iccp_profile PNG_DEPSTRUCT; /* International Color Consortium profile data */
|
|---|
| 813 | /* Note to maintainer: should be png_bytep */
|
|---|
| 814 | png_uint_32 iccp_proflen PNG_DEPSTRUCT; /* ICC profile data length */
|
|---|
| 815 | png_byte iccp_compression PNG_DEPSTRUCT; /* Always zero */
|
|---|
| 816 | #endif
|
|---|
| 817 |
|
|---|
| 818 | #ifdef PNG_sPLT_SUPPORTED
|
|---|
| 819 | /* Data on sPLT chunks (there may be more than one). */
|
|---|
| 820 | png_sPLT_tp splt_palettes PNG_DEPSTRUCT;
|
|---|
| 821 | png_uint_32 splt_palettes_num PNG_DEPSTRUCT;
|
|---|
| 822 | #endif
|
|---|
| 823 |
|
|---|
| 824 | #ifdef PNG_sCAL_SUPPORTED
|
|---|
| 825 | /* The sCAL chunk describes the actual physical dimensions of the
|
|---|
| 826 | * subject matter of the graphic. The chunk contains a unit specification
|
|---|
| 827 | * a byte value, and two ASCII strings representing floating-point
|
|---|
| 828 | * values. The values are width and height corresponsing to one pixel
|
|---|
| 829 | * in the image. This external representation is converted to double
|
|---|
| 830 | * here. Data values are valid if (valid & PNG_INFO_sCAL) is non-zero.
|
|---|
| 831 | */
|
|---|
| 832 | png_byte scal_unit PNG_DEPSTRUCT; /* unit of physical scale */
|
|---|
| 833 | #ifdef PNG_FLOATING_POINT_SUPPORTED
|
|---|
| 834 | double scal_pixel_width PNG_DEPSTRUCT; /* width of one pixel */
|
|---|
| 835 | double scal_pixel_height PNG_DEPSTRUCT; /* height of one pixel */
|
|---|
| 836 | #endif
|
|---|
| 837 | #ifdef PNG_FIXED_POINT_SUPPORTED
|
|---|
| 838 | png_charp scal_s_width PNG_DEPSTRUCT; /* string containing height */
|
|---|
| 839 | png_charp scal_s_height PNG_DEPSTRUCT; /* string containing width */
|
|---|
| 840 | #endif
|
|---|
| 841 | #endif
|
|---|
| 842 |
|
|---|
| 843 | #ifdef PNG_INFO_IMAGE_SUPPORTED
|
|---|
| 844 | /* Memory has been allocated if (valid & PNG_ALLOCATED_INFO_ROWS) non-zero */
|
|---|
| 845 | /* Data valid if (valid & PNG_INFO_IDAT) non-zero */
|
|---|
| 846 | png_bytepp row_pointers PNG_DEPSTRUCT; /* the image bits */
|
|---|
| 847 | #endif
|
|---|
| 848 |
|
|---|
| 849 | #if defined(PNG_FIXED_POINT_SUPPORTED) && defined(PNG_gAMA_SUPPORTED)
|
|---|
| 850 | png_fixed_point int_gamma PNG_DEPSTRUCT; /* gamma of image, if (valid & PNG_INFO_gAMA) */
|
|---|
| 851 | #endif
|
|---|
| 852 |
|
|---|
| 853 | #if defined(PNG_cHRM_SUPPORTED) && defined(PNG_FIXED_POINT_SUPPORTED)
|
|---|
| 854 | png_fixed_point int_x_white PNG_DEPSTRUCT;
|
|---|
| 855 | png_fixed_point int_y_white PNG_DEPSTRUCT;
|
|---|
| 856 | png_fixed_point int_x_red PNG_DEPSTRUCT;
|
|---|
| 857 | png_fixed_point int_y_red PNG_DEPSTRUCT;
|
|---|
| 858 | png_fixed_point int_x_green PNG_DEPSTRUCT;
|
|---|
| 859 | png_fixed_point int_y_green PNG_DEPSTRUCT;
|
|---|
| 860 | png_fixed_point int_x_blue PNG_DEPSTRUCT;
|
|---|
| 861 | png_fixed_point int_y_blue PNG_DEPSTRUCT;
|
|---|
| 862 | #endif
|
|---|
| 863 |
|
|---|
| 864 | } png_info;
|
|---|
| 865 |
|
|---|
| 866 | typedef png_info FAR * png_infop;
|
|---|
| 867 | typedef png_info FAR * FAR * png_infopp;
|
|---|
| 868 |
|
|---|
| 869 | /* Maximum positive integer used in PNG is (2^31)-1 */
|
|---|
| 870 | #define PNG_UINT_31_MAX ((png_uint_32)0x7fffffffL)
|
|---|
| 871 | #define PNG_UINT_32_MAX ((png_uint_32)(-1))
|
|---|
| 872 | #define PNG_SIZE_MAX ((png_size_t)(-1))
|
|---|
| 873 |
|
|---|
| 874 | /* These describe the color_type field in png_info. */
|
|---|
| 875 | /* color type masks */
|
|---|
| 876 | #define PNG_COLOR_MASK_PALETTE 1
|
|---|
| 877 | #define PNG_COLOR_MASK_COLOR 2
|
|---|
| 878 | #define PNG_COLOR_MASK_ALPHA 4
|
|---|
| 879 |
|
|---|
| 880 | /* color types. Note that not all combinations are legal */
|
|---|
| 881 | #define PNG_COLOR_TYPE_GRAY 0
|
|---|
| 882 | #define PNG_COLOR_TYPE_PALETTE (PNG_COLOR_MASK_COLOR | PNG_COLOR_MASK_PALETTE)
|
|---|
| 883 | #define PNG_COLOR_TYPE_RGB (PNG_COLOR_MASK_COLOR)
|
|---|
| 884 | #define PNG_COLOR_TYPE_RGB_ALPHA (PNG_COLOR_MASK_COLOR | PNG_COLOR_MASK_ALPHA)
|
|---|
| 885 | #define PNG_COLOR_TYPE_GRAY_ALPHA (PNG_COLOR_MASK_ALPHA)
|
|---|
| 886 | /* aliases */
|
|---|
| 887 | #define PNG_COLOR_TYPE_RGBA PNG_COLOR_TYPE_RGB_ALPHA
|
|---|
| 888 | #define PNG_COLOR_TYPE_GA PNG_COLOR_TYPE_GRAY_ALPHA
|
|---|
| 889 |
|
|---|
| 890 | /* This is for compression type. PNG 1.0-1.2 only define the single type. */
|
|---|
| 891 | #define PNG_COMPRESSION_TYPE_BASE 0 /* Deflate method 8, 32K window */
|
|---|
| 892 | #define PNG_COMPRESSION_TYPE_DEFAULT PNG_COMPRESSION_TYPE_BASE
|
|---|
| 893 |
|
|---|
| 894 | /* This is for filter type. PNG 1.0-1.2 only define the single type. */
|
|---|
| 895 | #define PNG_FILTER_TYPE_BASE 0 /* Single row per-byte filtering */
|
|---|
| 896 | #define PNG_INTRAPIXEL_DIFFERENCING 64 /* Used only in MNG datastreams */
|
|---|
| 897 | #define PNG_FILTER_TYPE_DEFAULT PNG_FILTER_TYPE_BASE
|
|---|
| 898 |
|
|---|
| 899 | /* These are for the interlacing type. These values should NOT be changed. */
|
|---|
| 900 | #define PNG_INTERLACE_NONE 0 /* Non-interlaced image */
|
|---|
| 901 | #define PNG_INTERLACE_ADAM7 1 /* Adam7 interlacing */
|
|---|
| 902 | #define PNG_INTERLACE_LAST 2 /* Not a valid value */
|
|---|
| 903 |
|
|---|
| 904 | /* These are for the oFFs chunk. These values should NOT be changed. */
|
|---|
| 905 | #define PNG_OFFSET_PIXEL 0 /* Offset in pixels */
|
|---|
| 906 | #define PNG_OFFSET_MICROMETER 1 /* Offset in micrometers (1/10^6 meter) */
|
|---|
| 907 | #define PNG_OFFSET_LAST 2 /* Not a valid value */
|
|---|
| 908 |
|
|---|
| 909 | /* These are for the pCAL chunk. These values should NOT be changed. */
|
|---|
| 910 | #define PNG_EQUATION_LINEAR 0 /* Linear transformation */
|
|---|
| 911 | #define PNG_EQUATION_BASE_E 1 /* Exponential base e transform */
|
|---|
| 912 | #define PNG_EQUATION_ARBITRARY 2 /* Arbitrary base exponential transform */
|
|---|
| 913 | #define PNG_EQUATION_HYPERBOLIC 3 /* Hyperbolic sine transformation */
|
|---|
| 914 | #define PNG_EQUATION_LAST 4 /* Not a valid value */
|
|---|
| 915 |
|
|---|
| 916 | /* These are for the sCAL chunk. These values should NOT be changed. */
|
|---|
| 917 | #define PNG_SCALE_UNKNOWN 0 /* unknown unit (image scale) */
|
|---|
| 918 | #define PNG_SCALE_METER 1 /* meters per pixel */
|
|---|
| 919 | #define PNG_SCALE_RADIAN 2 /* radians per pixel */
|
|---|
| 920 | #define PNG_SCALE_LAST 3 /* Not a valid value */
|
|---|
| 921 |
|
|---|
| 922 | /* These are for the pHYs chunk. These values should NOT be changed. */
|
|---|
| 923 | #define PNG_RESOLUTION_UNKNOWN 0 /* pixels/unknown unit (aspect ratio) */
|
|---|
| 924 | #define PNG_RESOLUTION_METER 1 /* pixels/meter */
|
|---|
| 925 | #define PNG_RESOLUTION_LAST 2 /* Not a valid value */
|
|---|
| 926 |
|
|---|
| 927 | /* These are for the sRGB chunk. These values should NOT be changed. */
|
|---|
| 928 | #define PNG_sRGB_INTENT_PERCEPTUAL 0
|
|---|
| 929 | #define PNG_sRGB_INTENT_RELATIVE 1
|
|---|
| 930 | #define PNG_sRGB_INTENT_SATURATION 2
|
|---|
| 931 | #define PNG_sRGB_INTENT_ABSOLUTE 3
|
|---|
| 932 | #define PNG_sRGB_INTENT_LAST 4 /* Not a valid value */
|
|---|
| 933 |
|
|---|
| 934 | /* This is for text chunks */
|
|---|
| 935 | #define PNG_KEYWORD_MAX_LENGTH 79
|
|---|
| 936 |
|
|---|
| 937 | /* Maximum number of entries in PLTE/sPLT/tRNS arrays */
|
|---|
| 938 | #define PNG_MAX_PALETTE_LENGTH 256
|
|---|
| 939 |
|
|---|
| 940 | /* These determine if an ancillary chunk's data has been successfully read
|
|---|
| 941 | * from the PNG header, or if the application has filled in the corresponding
|
|---|
| 942 | * data in the info_struct to be written into the output file. The values
|
|---|
| 943 | * of the PNG_INFO_<chunk> defines should NOT be changed.
|
|---|
| 944 | */
|
|---|
| 945 | #define PNG_INFO_gAMA 0x0001
|
|---|
| 946 | #define PNG_INFO_sBIT 0x0002
|
|---|
| 947 | #define PNG_INFO_cHRM 0x0004
|
|---|
| 948 | #define PNG_INFO_PLTE 0x0008
|
|---|
| 949 | #define PNG_INFO_tRNS 0x0010
|
|---|
| 950 | #define PNG_INFO_bKGD 0x0020
|
|---|
| 951 | #define PNG_INFO_hIST 0x0040
|
|---|
| 952 | #define PNG_INFO_pHYs 0x0080
|
|---|
| 953 | #define PNG_INFO_oFFs 0x0100
|
|---|
| 954 | #define PNG_INFO_tIME 0x0200
|
|---|
| 955 | #define PNG_INFO_pCAL 0x0400
|
|---|
| 956 | #define PNG_INFO_sRGB 0x0800 /* GR-P, 0.96a */
|
|---|
| 957 | #define PNG_INFO_iCCP 0x1000 /* ESR, 1.0.6 */
|
|---|
| 958 | #define PNG_INFO_sPLT 0x2000 /* ESR, 1.0.6 */
|
|---|
| 959 | #define PNG_INFO_sCAL 0x4000 /* ESR, 1.0.6 */
|
|---|
| 960 | #define PNG_INFO_IDAT 0x8000L /* ESR, 1.0.6 */
|
|---|
| 961 |
|
|---|
| 962 | /* This is used for the transformation routines, as some of them
|
|---|
| 963 | * change these values for the row. It also should enable using
|
|---|
| 964 | * the routines for other purposes.
|
|---|
| 965 | */
|
|---|
| 966 | typedef struct png_row_info_struct
|
|---|
| 967 | {
|
|---|
| 968 | png_uint_32 width; /* width of row */
|
|---|
| 969 | png_size_t rowbytes; /* number of bytes in row */
|
|---|
| 970 | png_byte color_type; /* color type of row */
|
|---|
| 971 | png_byte bit_depth; /* bit depth of row */
|
|---|
| 972 | png_byte channels; /* number of channels (1, 2, 3, or 4) */
|
|---|
| 973 | png_byte pixel_depth; /* bits per pixel (depth * channels) */
|
|---|
| 974 | } png_row_info;
|
|---|
| 975 |
|
|---|
| 976 | typedef png_row_info FAR * png_row_infop;
|
|---|
| 977 | typedef png_row_info FAR * FAR * png_row_infopp;
|
|---|
| 978 |
|
|---|
| 979 | /* These are the function types for the I/O functions and for the functions
|
|---|
| 980 | * that allow the user to override the default I/O functions with his or her
|
|---|
| 981 | * own. The png_error_ptr type should match that of user-supplied warning
|
|---|
| 982 | * and error functions, while the png_rw_ptr type should match that of the
|
|---|
| 983 | * user read/write data functions.
|
|---|
| 984 | */
|
|---|
| 985 | typedef struct png_struct_def png_struct;
|
|---|
| 986 | typedef png_struct FAR * png_structp;
|
|---|
| 987 |
|
|---|
| 988 | typedef void (PNGAPI *png_error_ptr) PNGARG((png_structp, png_const_charp));
|
|---|
| 989 | typedef void (PNGAPI *png_rw_ptr) PNGARG((png_structp, png_bytep, png_size_t));
|
|---|
| 990 | typedef void (PNGAPI *png_flush_ptr) PNGARG((png_structp));
|
|---|
| 991 | typedef void (PNGAPI *png_read_status_ptr) PNGARG((png_structp, png_uint_32,
|
|---|
| 992 | int));
|
|---|
| 993 | typedef void (PNGAPI *png_write_status_ptr) PNGARG((png_structp, png_uint_32,
|
|---|
| 994 | int));
|
|---|
| 995 |
|
|---|
| 996 | #ifdef PNG_PROGRESSIVE_READ_SUPPORTED
|
|---|
| 997 | typedef void (PNGAPI *png_progressive_info_ptr) PNGARG((png_structp, png_infop));
|
|---|
| 998 | typedef void (PNGAPI *png_progressive_end_ptr) PNGARG((png_structp, png_infop));
|
|---|
| 999 | typedef void (PNGAPI *png_progressive_row_ptr) PNGARG((png_structp, png_bytep,
|
|---|
| 1000 | png_uint_32, int));
|
|---|
| 1001 | #endif
|
|---|
| 1002 |
|
|---|
| 1003 | #if defined(PNG_READ_USER_TRANSFORM_SUPPORTED) || \
|
|---|
| 1004 | defined(PNG_WRITE_USER_TRANSFORM_SUPPORTED)
|
|---|
| 1005 | typedef void (PNGAPI *png_user_transform_ptr) PNGARG((png_structp,
|
|---|
| 1006 | png_row_infop, png_bytep));
|
|---|
| 1007 | #endif
|
|---|
| 1008 |
|
|---|
| 1009 | #ifdef PNG_USER_CHUNKS_SUPPORTED
|
|---|
| 1010 | typedef int (PNGAPI *png_user_chunk_ptr) PNGARG((png_structp, png_unknown_chunkp));
|
|---|
| 1011 | #endif
|
|---|
| 1012 | #ifdef PNG_UNKNOWN_CHUNKS_SUPPORTED
|
|---|
| 1013 | typedef void (PNGAPI *png_unknown_chunk_ptr) PNGARG((png_structp));
|
|---|
| 1014 | #endif
|
|---|
| 1015 | #ifdef PNG_SETJMP_SUPPORTED
|
|---|
| 1016 | /* This must match the function definition in <setjmp.h>, and the
|
|---|
| 1017 | * application must include this before png.h to obtain the definition
|
|---|
| 1018 | * of jmp_buf.
|
|---|
| 1019 | */
|
|---|
| 1020 | typedef void (PNGAPI *png_longjmp_ptr) PNGARG((jmp_buf, int));
|
|---|
| 1021 | #endif
|
|---|
| 1022 |
|
|---|
| 1023 | /* Transform masks for the high-level interface */
|
|---|
| 1024 | #define PNG_TRANSFORM_IDENTITY 0x0000 /* read and write */
|
|---|
| 1025 | #define PNG_TRANSFORM_STRIP_16 0x0001 /* read only */
|
|---|
| 1026 | #define PNG_TRANSFORM_STRIP_ALPHA 0x0002 /* read only */
|
|---|
| 1027 | #define PNG_TRANSFORM_PACKING 0x0004 /* read and write */
|
|---|
| 1028 | #define PNG_TRANSFORM_PACKSWAP 0x0008 /* read and write */
|
|---|
| 1029 | #define PNG_TRANSFORM_EXPAND 0x0010 /* read only */
|
|---|
| 1030 | #define PNG_TRANSFORM_INVERT_MONO 0x0020 /* read and write */
|
|---|
| 1031 | #define PNG_TRANSFORM_SHIFT 0x0040 /* read and write */
|
|---|
| 1032 | #define PNG_TRANSFORM_BGR 0x0080 /* read and write */
|
|---|
| 1033 | #define PNG_TRANSFORM_SWAP_ALPHA 0x0100 /* read and write */
|
|---|
| 1034 | #define PNG_TRANSFORM_SWAP_ENDIAN 0x0200 /* read and write */
|
|---|
| 1035 | #define PNG_TRANSFORM_INVERT_ALPHA 0x0400 /* read and write */
|
|---|
| 1036 | #define PNG_TRANSFORM_STRIP_FILLER 0x0800 /* write only */
|
|---|
| 1037 | /* Added to libpng-1.2.34 */
|
|---|
| 1038 | #define PNG_TRANSFORM_STRIP_FILLER_BEFORE PNG_TRANSFORM_STRIP_FILLER
|
|---|
| 1039 | #define PNG_TRANSFORM_STRIP_FILLER_AFTER 0x1000 /* write only */
|
|---|
| 1040 | /* Added to libpng-1.4.0 */
|
|---|
| 1041 | #define PNG_TRANSFORM_GRAY_TO_RGB 0x2000 /* read only */
|
|---|
| 1042 |
|
|---|
| 1043 | /* Flags for MNG supported features */
|
|---|
| 1044 | #define PNG_FLAG_MNG_EMPTY_PLTE 0x01
|
|---|
| 1045 | #define PNG_FLAG_MNG_FILTER_64 0x04
|
|---|
| 1046 | #define PNG_ALL_MNG_FEATURES 0x05
|
|---|
| 1047 |
|
|---|
| 1048 | typedef png_voidp (*png_malloc_ptr) PNGARG((png_structp, png_alloc_size_t));
|
|---|
| 1049 | typedef void (*png_free_ptr) PNGARG((png_structp, png_voidp));
|
|---|
| 1050 |
|
|---|
| 1051 | /* The structure that holds the information to read and write PNG files.
|
|---|
| 1052 | * The only people who need to care about what is inside of this are the
|
|---|
| 1053 | * people who will be modifying the library for their own special needs.
|
|---|
| 1054 | * It should NOT be accessed directly by an application, except to store
|
|---|
| 1055 | * the jmp_buf.
|
|---|
| 1056 | */
|
|---|
| 1057 |
|
|---|
| 1058 | struct png_struct_def
|
|---|
| 1059 | {
|
|---|
| 1060 | #ifdef PNG_SETJMP_SUPPORTED
|
|---|
| 1061 | jmp_buf jmpbuf PNG_DEPSTRUCT; /* used in png_error */
|
|---|
| 1062 | png_longjmp_ptr longjmp_fn PNG_DEPSTRUCT;/* setjmp non-local goto function. */
|
|---|
| 1063 | #endif
|
|---|
| 1064 | png_error_ptr error_fn PNG_DEPSTRUCT; /* function for printing errors and aborting */
|
|---|
| 1065 | png_error_ptr warning_fn PNG_DEPSTRUCT; /* function for printing warnings */
|
|---|
| 1066 | png_voidp error_ptr PNG_DEPSTRUCT; /* user supplied struct for error functions */
|
|---|
| 1067 | png_rw_ptr write_data_fn PNG_DEPSTRUCT; /* function for writing output data */
|
|---|
| 1068 | png_rw_ptr read_data_fn PNG_DEPSTRUCT; /* function for reading input data */
|
|---|
| 1069 | png_voidp io_ptr PNG_DEPSTRUCT; /* ptr to application struct for I/O functions */
|
|---|
| 1070 |
|
|---|
| 1071 | #ifdef PNG_READ_USER_TRANSFORM_SUPPORTED
|
|---|
| 1072 | png_user_transform_ptr read_user_transform_fn PNG_DEPSTRUCT; /* user read transform */
|
|---|
| 1073 | #endif
|
|---|
| 1074 |
|
|---|
| 1075 | #ifdef PNG_WRITE_USER_TRANSFORM_SUPPORTED
|
|---|
| 1076 | png_user_transform_ptr write_user_transform_fn PNG_DEPSTRUCT; /* user write transform */
|
|---|
| 1077 | #endif
|
|---|
| 1078 |
|
|---|
| 1079 | /* These were added in libpng-1.0.2 */
|
|---|
| 1080 | #ifdef PNG_USER_TRANSFORM_PTR_SUPPORTED
|
|---|
| 1081 | #if defined(PNG_READ_USER_TRANSFORM_SUPPORTED) || \
|
|---|
| 1082 | defined(PNG_WRITE_USER_TRANSFORM_SUPPORTED)
|
|---|
| 1083 | png_voidp user_transform_ptr PNG_DEPSTRUCT; /* user supplied struct for user transform */
|
|---|
| 1084 | png_byte user_transform_depth PNG_DEPSTRUCT; /* bit depth of user transformed pixels */
|
|---|
| 1085 | png_byte user_transform_channels PNG_DEPSTRUCT; /* channels in user transformed pixels */
|
|---|
| 1086 | #endif
|
|---|
| 1087 | #endif
|
|---|
| 1088 |
|
|---|
| 1089 | png_uint_32 mode PNG_DEPSTRUCT; /* tells us where we are in the PNG file */
|
|---|
| 1090 | png_uint_32 flags PNG_DEPSTRUCT; /* flags indicating various things to libpng */
|
|---|
| 1091 | png_uint_32 transformations PNG_DEPSTRUCT; /* which transformations to perform */
|
|---|
| 1092 |
|
|---|
| 1093 | z_stream zstream PNG_DEPSTRUCT; /* pointer to decompression structure (below) */
|
|---|
| 1094 | png_bytep zbuf PNG_DEPSTRUCT; /* buffer for zlib */
|
|---|
| 1095 | png_size_t zbuf_size PNG_DEPSTRUCT; /* size of zbuf */
|
|---|
| 1096 | int zlib_level PNG_DEPSTRUCT; /* holds zlib compression level */
|
|---|
| 1097 | int zlib_method PNG_DEPSTRUCT; /* holds zlib compression method */
|
|---|
| 1098 | int zlib_window_bits PNG_DEPSTRUCT; /* holds zlib compression window bits */
|
|---|
| 1099 | int zlib_mem_level PNG_DEPSTRUCT; /* holds zlib compression memory level */
|
|---|
| 1100 | int zlib_strategy PNG_DEPSTRUCT; /* holds zlib compression strategy */
|
|---|
| 1101 |
|
|---|
| 1102 | png_uint_32 width PNG_DEPSTRUCT; /* width of image in pixels */
|
|---|
| 1103 | png_uint_32 height PNG_DEPSTRUCT; /* height of image in pixels */
|
|---|
| 1104 | png_uint_32 num_rows PNG_DEPSTRUCT; /* number of rows in current pass */
|
|---|
| 1105 | png_uint_32 usr_width PNG_DEPSTRUCT; /* width of row at start of write */
|
|---|
| 1106 | png_size_t rowbytes PNG_DEPSTRUCT; /* size of row in bytes */
|
|---|
| 1107 | png_size_t irowbytes PNG_DEPSTRUCT; /* size of current interlaced row in bytes */
|
|---|
| 1108 | png_uint_32 iwidth PNG_DEPSTRUCT; /* width of current interlaced row in pixels */
|
|---|
| 1109 | png_uint_32 row_number PNG_DEPSTRUCT; /* current row in interlace pass */
|
|---|
| 1110 | png_bytep prev_row PNG_DEPSTRUCT; /* buffer to save previous (unfiltered) row */
|
|---|
| 1111 | png_bytep row_buf PNG_DEPSTRUCT; /* buffer to save current (unfiltered) row */
|
|---|
| 1112 | png_bytep sub_row PNG_DEPSTRUCT; /* buffer to save "sub" row when filtering */
|
|---|
| 1113 | png_bytep up_row PNG_DEPSTRUCT; /* buffer to save "up" row when filtering */
|
|---|
| 1114 | png_bytep avg_row PNG_DEPSTRUCT; /* buffer to save "avg" row when filtering */
|
|---|
| 1115 | png_bytep paeth_row PNG_DEPSTRUCT; /* buffer to save "Paeth" row when filtering */
|
|---|
| 1116 | png_row_info row_info PNG_DEPSTRUCT; /* used for transformation routines */
|
|---|
| 1117 |
|
|---|
| 1118 | png_uint_32 idat_size PNG_DEPSTRUCT; /* current IDAT size for read */
|
|---|
| 1119 | png_uint_32 crc PNG_DEPSTRUCT; /* current chunk CRC value */
|
|---|
| 1120 | png_colorp palette PNG_DEPSTRUCT; /* palette from the input file */
|
|---|
| 1121 | png_uint_16 num_palette PNG_DEPSTRUCT; /* number of color entries in palette */
|
|---|
| 1122 | png_uint_16 num_trans PNG_DEPSTRUCT; /* number of transparency values */
|
|---|
| 1123 | png_byte chunk_name[5] PNG_DEPSTRUCT; /* null-terminated name of current chunk */
|
|---|
| 1124 | png_byte compression PNG_DEPSTRUCT; /* file compression type (always 0) */
|
|---|
| 1125 | png_byte filter PNG_DEPSTRUCT; /* file filter type (always 0) */
|
|---|
| 1126 | png_byte interlaced PNG_DEPSTRUCT; /* PNG_INTERLACE_NONE, PNG_INTERLACE_ADAM7 */
|
|---|
| 1127 | png_byte pass PNG_DEPSTRUCT; /* current interlace pass (0 - 6) */
|
|---|
| 1128 | png_byte do_filter PNG_DEPSTRUCT; /* row filter flags (see PNG_FILTER_ below ) */
|
|---|
| 1129 | png_byte color_type PNG_DEPSTRUCT; /* color type of file */
|
|---|
| 1130 | png_byte bit_depth PNG_DEPSTRUCT; /* bit depth of file */
|
|---|
| 1131 | png_byte usr_bit_depth PNG_DEPSTRUCT; /* bit depth of users row */
|
|---|
| 1132 | png_byte pixel_depth PNG_DEPSTRUCT; /* number of bits per pixel */
|
|---|
| 1133 | png_byte channels PNG_DEPSTRUCT; /* number of channels in file */
|
|---|
| 1134 | png_byte usr_channels PNG_DEPSTRUCT; /* channels at start of write */
|
|---|
| 1135 | png_byte sig_bytes PNG_DEPSTRUCT; /* magic bytes read/written from start of file */
|
|---|
| 1136 |
|
|---|
| 1137 | #if defined(PNG_READ_FILLER_SUPPORTED) || defined(PNG_WRITE_FILLER_SUPPORTED)
|
|---|
| 1138 | png_uint_16 filler PNG_DEPSTRUCT; /* filler bytes for pixel expansion */
|
|---|
| 1139 | #endif
|
|---|
| 1140 |
|
|---|
| 1141 | #ifdef PNG_bKGD_SUPPORTED
|
|---|
| 1142 | png_byte background_gamma_type PNG_DEPSTRUCT;
|
|---|
| 1143 | # ifdef PNG_FLOATING_POINT_SUPPORTED
|
|---|
| 1144 | float background_gamma PNG_DEPSTRUCT;
|
|---|
| 1145 | # endif
|
|---|
| 1146 | png_color_16 background PNG_DEPSTRUCT; /* background color in screen gamma space */
|
|---|
| 1147 | #ifdef PNG_READ_GAMMA_SUPPORTED
|
|---|
| 1148 | png_color_16 background_1 PNG_DEPSTRUCT; /* background normalized to gamma 1.0 */
|
|---|
| 1149 | #endif
|
|---|
| 1150 | #endif /* PNG_bKGD_SUPPORTED */
|
|---|
| 1151 |
|
|---|
| 1152 | #ifdef PNG_WRITE_FLUSH_SUPPORTED
|
|---|
| 1153 | png_flush_ptr output_flush_fn PNG_DEPSTRUCT; /* Function for flushing output */
|
|---|
| 1154 | png_uint_32 flush_dist PNG_DEPSTRUCT; /* how many rows apart to flush, 0 - no flush */
|
|---|
| 1155 | png_uint_32 flush_rows PNG_DEPSTRUCT; /* number of rows written since last flush */
|
|---|
| 1156 | #endif
|
|---|
| 1157 |
|
|---|
| 1158 | #if defined(PNG_READ_GAMMA_SUPPORTED) || defined(PNG_READ_BACKGROUND_SUPPORTED)
|
|---|
| 1159 | int gamma_shift PNG_DEPSTRUCT; /* number of "insignificant" bits 16-bit gamma */
|
|---|
| 1160 | #ifdef PNG_FLOATING_POINT_SUPPORTED
|
|---|
| 1161 | float gamma PNG_DEPSTRUCT; /* file gamma value */
|
|---|
| 1162 | float screen_gamma PNG_DEPSTRUCT; /* screen gamma value (display_exponent) */
|
|---|
| 1163 | #endif
|
|---|
| 1164 | #endif
|
|---|
| 1165 |
|
|---|
| 1166 | #if defined(PNG_READ_GAMMA_SUPPORTED) || defined(PNG_READ_BACKGROUND_SUPPORTED)
|
|---|
| 1167 | png_bytep gamma_table PNG_DEPSTRUCT; /* gamma table for 8-bit depth files */
|
|---|
| 1168 | png_bytep gamma_from_1 PNG_DEPSTRUCT; /* converts from 1.0 to screen */
|
|---|
| 1169 | png_bytep gamma_to_1 PNG_DEPSTRUCT; /* converts from file to 1.0 */
|
|---|
| 1170 | png_uint_16pp gamma_16_table PNG_DEPSTRUCT; /* gamma table for 16-bit depth files */
|
|---|
| 1171 | png_uint_16pp gamma_16_from_1 PNG_DEPSTRUCT; /* converts from 1.0 to screen */
|
|---|
| 1172 | png_uint_16pp gamma_16_to_1 PNG_DEPSTRUCT; /* converts from file to 1.0 */
|
|---|
| 1173 | #endif
|
|---|
| 1174 |
|
|---|
| 1175 | #if defined(PNG_READ_GAMMA_SUPPORTED) || defined(PNG_sBIT_SUPPORTED)
|
|---|
| 1176 | png_color_8 sig_bit PNG_DEPSTRUCT; /* significant bits in each available channel */
|
|---|
| 1177 | #endif
|
|---|
| 1178 |
|
|---|
| 1179 | #if defined(PNG_READ_SHIFT_SUPPORTED) || defined(PNG_WRITE_SHIFT_SUPPORTED)
|
|---|
| 1180 | png_color_8 shift PNG_DEPSTRUCT; /* shift for significant bit tranformation */
|
|---|
| 1181 | #endif
|
|---|
| 1182 |
|
|---|
| 1183 | #if defined(PNG_tRNS_SUPPORTED) || defined(PNG_READ_BACKGROUND_SUPPORTED) \
|
|---|
| 1184 | || defined(PNG_READ_EXPAND_SUPPORTED) || defined(PNG_READ_BACKGROUND_SUPPORTED)
|
|---|
| 1185 | png_bytep trans_alpha PNG_DEPSTRUCT; /* alpha values for paletted files */
|
|---|
| 1186 | png_color_16 trans_color PNG_DEPSTRUCT; /* transparent color for non-paletted files */
|
|---|
| 1187 | #endif
|
|---|
| 1188 |
|
|---|
| 1189 | png_read_status_ptr read_row_fn PNG_DEPSTRUCT; /* called after each row is decoded */
|
|---|
| 1190 | png_write_status_ptr write_row_fn PNG_DEPSTRUCT; /* called after each row is encoded */
|
|---|
| 1191 | #ifdef PNG_PROGRESSIVE_READ_SUPPORTED
|
|---|
| 1192 | png_progressive_info_ptr info_fn PNG_DEPSTRUCT; /* called after header data fully read */
|
|---|
| 1193 | png_progressive_row_ptr row_fn PNG_DEPSTRUCT; /* called after each prog. row is decoded */
|
|---|
| 1194 | png_progressive_end_ptr end_fn PNG_DEPSTRUCT; /* called after image is complete */
|
|---|
| 1195 | png_bytep save_buffer_ptr PNG_DEPSTRUCT; /* current location in save_buffer */
|
|---|
| 1196 | png_bytep save_buffer PNG_DEPSTRUCT; /* buffer for previously read data */
|
|---|
| 1197 | png_bytep current_buffer_ptr PNG_DEPSTRUCT; /* current location in current_buffer */
|
|---|
| 1198 | png_bytep current_buffer PNG_DEPSTRUCT; /* buffer for recently used data */
|
|---|
| 1199 | png_uint_32 push_length PNG_DEPSTRUCT; /* size of current input chunk */
|
|---|
| 1200 | png_uint_32 skip_length PNG_DEPSTRUCT; /* bytes to skip in input data */
|
|---|
| 1201 | png_size_t save_buffer_size PNG_DEPSTRUCT; /* amount of data now in save_buffer */
|
|---|
| 1202 | png_size_t save_buffer_max PNG_DEPSTRUCT; /* total size of save_buffer */
|
|---|
| 1203 | png_size_t buffer_size PNG_DEPSTRUCT; /* total amount of available input data */
|
|---|
| 1204 | png_size_t current_buffer_size PNG_DEPSTRUCT; /* amount of data now in current_buffer */
|
|---|
| 1205 | int process_mode PNG_DEPSTRUCT; /* what push library is currently doing */
|
|---|
| 1206 | int cur_palette PNG_DEPSTRUCT; /* current push library palette index */
|
|---|
| 1207 |
|
|---|
| 1208 | # ifdef PNG_TEXT_SUPPORTED
|
|---|
| 1209 | png_size_t current_text_size PNG_DEPSTRUCT; /* current size of text input data */
|
|---|
| 1210 | png_size_t current_text_left PNG_DEPSTRUCT; /* how much text left to read in input */
|
|---|
| 1211 | png_charp current_text PNG_DEPSTRUCT; /* current text chunk buffer */
|
|---|
| 1212 | png_charp current_text_ptr PNG_DEPSTRUCT; /* current location in current_text */
|
|---|
| 1213 | # endif /* PNG_PROGRESSIVE_READ_SUPPORTED && PNG_TEXT_SUPPORTED */
|
|---|
| 1214 |
|
|---|
| 1215 | #endif /* PNG_PROGRESSIVE_READ_SUPPORTED */
|
|---|
| 1216 |
|
|---|
| 1217 | #if defined(__TURBOC__) && !defined(_Windows) && !defined(__FLAT__)
|
|---|
| 1218 | /* For the Borland special 64K segment handler */
|
|---|
| 1219 | png_bytepp offset_table_ptr PNG_DEPSTRUCT;
|
|---|
| 1220 | png_bytep offset_table PNG_DEPSTRUCT;
|
|---|
| 1221 | png_uint_16 offset_table_number PNG_DEPSTRUCT;
|
|---|
| 1222 | png_uint_16 offset_table_count PNG_DEPSTRUCT;
|
|---|
| 1223 | png_uint_16 offset_table_count_free PNG_DEPSTRUCT;
|
|---|
| 1224 | #endif
|
|---|
| 1225 |
|
|---|
| 1226 | #ifdef PNG_READ_DITHER_SUPPORTED
|
|---|
| 1227 | png_bytep palette_lookup PNG_DEPSTRUCT; /* lookup table for dithering */
|
|---|
| 1228 | png_bytep dither_index PNG_DEPSTRUCT; /* index translation for palette files */
|
|---|
| 1229 | #endif
|
|---|
| 1230 |
|
|---|
| 1231 | #if defined(PNG_READ_DITHER_SUPPORTED) || defined(PNG_hIST_SUPPORTED)
|
|---|
| 1232 | png_uint_16p hist PNG_DEPSTRUCT; /* histogram */
|
|---|
| 1233 | #endif
|
|---|
| 1234 |
|
|---|
| 1235 | #ifdef PNG_WRITE_WEIGHTED_FILTER_SUPPORTED
|
|---|
| 1236 | png_byte heuristic_method PNG_DEPSTRUCT; /* heuristic for row filter selection */
|
|---|
| 1237 | png_byte num_prev_filters PNG_DEPSTRUCT; /* number of weights for previous rows */
|
|---|
| 1238 | png_bytep prev_filters PNG_DEPSTRUCT; /* filter type(s) of previous row(s) */
|
|---|
| 1239 | png_uint_16p filter_weights PNG_DEPSTRUCT; /* weight(s) for previous line(s) */
|
|---|
| 1240 | png_uint_16p inv_filter_weights PNG_DEPSTRUCT; /* 1/weight(s) for previous line(s) */
|
|---|
| 1241 | png_uint_16p filter_costs PNG_DEPSTRUCT; /* relative filter calculation cost */
|
|---|
| 1242 | png_uint_16p inv_filter_costs PNG_DEPSTRUCT; /* 1/relative filter calculation cost */
|
|---|
| 1243 | #endif
|
|---|
| 1244 |
|
|---|
| 1245 | #ifdef PNG_TIME_RFC1123_SUPPORTED
|
|---|
| 1246 | png_charp time_buffer PNG_DEPSTRUCT; /* String to hold RFC 1123 time text */
|
|---|
| 1247 | #endif
|
|---|
| 1248 |
|
|---|
| 1249 | /* New members added in libpng-1.0.6 */
|
|---|
| 1250 |
|
|---|
| 1251 | png_uint_32 free_me PNG_DEPSTRUCT; /* flags items libpng is responsible for freeing */
|
|---|
| 1252 |
|
|---|
| 1253 | #ifdef PNG_USER_CHUNKS_SUPPORTED
|
|---|
| 1254 | png_voidp user_chunk_ptr PNG_DEPSTRUCT;
|
|---|
| 1255 | png_user_chunk_ptr read_user_chunk_fn PNG_DEPSTRUCT; /* user read chunk handler */
|
|---|
| 1256 | #endif
|
|---|
| 1257 |
|
|---|
| 1258 | #ifdef PNG_HANDLE_AS_UNKNOWN_SUPPORTED
|
|---|
| 1259 | int num_chunk_list PNG_DEPSTRUCT;
|
|---|
| 1260 | png_bytep chunk_list PNG_DEPSTRUCT;
|
|---|
| 1261 | #endif
|
|---|
| 1262 |
|
|---|
| 1263 | /* New members added in libpng-1.0.3 */
|
|---|
| 1264 | #ifdef PNG_READ_RGB_TO_GRAY_SUPPORTED
|
|---|
| 1265 | png_byte rgb_to_gray_status PNG_DEPSTRUCT;
|
|---|
| 1266 | /* These were changed from png_byte in libpng-1.0.6 */
|
|---|
| 1267 | png_uint_16 rgb_to_gray_red_coeff PNG_DEPSTRUCT;
|
|---|
| 1268 | png_uint_16 rgb_to_gray_green_coeff PNG_DEPSTRUCT;
|
|---|
| 1269 | png_uint_16 rgb_to_gray_blue_coeff PNG_DEPSTRUCT;
|
|---|
| 1270 | #endif
|
|---|
| 1271 |
|
|---|
| 1272 | /* New member added in libpng-1.0.4 (renamed in 1.0.9) */
|
|---|
| 1273 | #if defined(PNG_MNG_FEATURES_SUPPORTED) || \
|
|---|
| 1274 | defined(PNG_READ_EMPTY_PLTE_SUPPORTED) || \
|
|---|
| 1275 | defined(PNG_WRITE_EMPTY_PLTE_SUPPORTED)
|
|---|
| 1276 | /* Changed from png_byte to png_uint_32 at version 1.2.0 */
|
|---|
| 1277 | png_uint_32 mng_features_permitted PNG_DEPSTRUCT;
|
|---|
| 1278 | #endif
|
|---|
| 1279 |
|
|---|
| 1280 | /* New member added in libpng-1.0.7 */
|
|---|
| 1281 | #if defined(PNG_READ_GAMMA_SUPPORTED) || defined(PNG_READ_BACKGROUND_SUPPORTED)
|
|---|
| 1282 | png_fixed_point int_gamma PNG_DEPSTRUCT;
|
|---|
| 1283 | #endif
|
|---|
| 1284 |
|
|---|
| 1285 | /* New member added in libpng-1.0.9, ifdef'ed out in 1.0.12, enabled in 1.2.0 */
|
|---|
| 1286 | #ifdef PNG_MNG_FEATURES_SUPPORTED
|
|---|
| 1287 | png_byte filter_type PNG_DEPSTRUCT;
|
|---|
| 1288 | #endif
|
|---|
| 1289 |
|
|---|
| 1290 | /* New members added in libpng-1.2.0 */
|
|---|
| 1291 |
|
|---|
| 1292 | /* New members added in libpng-1.0.2 but first enabled by default in 1.2.0 */
|
|---|
| 1293 | #ifdef PNG_USER_MEM_SUPPORTED
|
|---|
| 1294 | png_voidp mem_ptr PNG_DEPSTRUCT; /* user supplied struct for mem functions */
|
|---|
| 1295 | png_malloc_ptr malloc_fn PNG_DEPSTRUCT; /* function for allocating memory */
|
|---|
| 1296 | png_free_ptr free_fn PNG_DEPSTRUCT; /* function for freeing memory */
|
|---|
| 1297 | #endif
|
|---|
| 1298 |
|
|---|
| 1299 | /* New member added in libpng-1.0.13 and 1.2.0 */
|
|---|
| 1300 | png_bytep big_row_buf PNG_DEPSTRUCT; /* buffer to save current (unfiltered) row */
|
|---|
| 1301 |
|
|---|
| 1302 | #ifdef PNG_READ_DITHER_SUPPORTED
|
|---|
| 1303 | /* The following three members were added at version 1.0.14 and 1.2.4 */
|
|---|
| 1304 | png_bytep dither_sort PNG_DEPSTRUCT; /* working sort array */
|
|---|
| 1305 | png_bytep index_to_palette PNG_DEPSTRUCT; /* where the original index currently is */
|
|---|
| 1306 | /* in the palette */
|
|---|
| 1307 | png_bytep palette_to_index PNG_DEPSTRUCT; /* which original index points to this */
|
|---|
| 1308 | /* palette color */
|
|---|
| 1309 | #endif
|
|---|
| 1310 |
|
|---|
| 1311 | /* New members added in libpng-1.0.16 and 1.2.6 */
|
|---|
| 1312 | png_byte compression_type PNG_DEPSTRUCT;
|
|---|
| 1313 |
|
|---|
| 1314 | #ifdef PNG_SET_USER_LIMITS_SUPPORTED
|
|---|
| 1315 | png_uint_32 user_width_max PNG_DEPSTRUCT;
|
|---|
| 1316 | png_uint_32 user_height_max PNG_DEPSTRUCT;
|
|---|
| 1317 | /* Added in libpng-1.4.0: Total number of sPLT, text, and unknown
|
|---|
| 1318 | * chunks that can be stored (0x7fffffff means unlimited).
|
|---|
| 1319 | */
|
|---|
| 1320 | png_uint_32 user_chunk_cache_max PNG_DEPSTRUCT;
|
|---|
| 1321 | #endif
|
|---|
| 1322 |
|
|---|
| 1323 | /* New member added in libpng-1.0.25 and 1.2.17 */
|
|---|
| 1324 | #ifdef PNG_UNKNOWN_CHUNKS_SUPPORTED
|
|---|
| 1325 | /* Storage for unknown chunk that the library doesn't recognize. */
|
|---|
| 1326 | png_unknown_chunk unknown_chunk PNG_DEPSTRUCT;
|
|---|
| 1327 | #endif
|
|---|
| 1328 |
|
|---|
| 1329 | /* New members added in libpng-1.2.26 */
|
|---|
| 1330 | png_uint_32 old_big_row_buf_size PNG_DEPSTRUCT;
|
|---|
| 1331 | png_uint_32 old_prev_row_size PNG_DEPSTRUCT;
|
|---|
| 1332 |
|
|---|
| 1333 | /* New member added in libpng-1.2.30 */
|
|---|
| 1334 | png_charp chunkdata PNG_DEPSTRUCT; /* buffer for reading chunk data */
|
|---|
| 1335 |
|
|---|
| 1336 | /* New member added in libpng-1.4.0 */
|
|---|
| 1337 | #ifdef PNG_IO_STATE_SUPPORTED
|
|---|
| 1338 | png_uint_32 io_state PNG_DEPSTRUCT;
|
|---|
| 1339 | #endif
|
|---|
| 1340 | };
|
|---|
| 1341 |
|
|---|
| 1342 |
|
|---|
| 1343 | /* This triggers a compiler error in png.c, if png.c and png.h
|
|---|
| 1344 | * do not agree upon the version number.
|
|---|
| 1345 | */
|
|---|
| 1346 | typedef png_structp version_1_4_0;
|
|---|
| 1347 |
|
|---|
| 1348 | typedef png_struct FAR * FAR * png_structpp;
|
|---|
| 1349 |
|
|---|
| 1350 | /* Here are the function definitions most commonly used. This is not
|
|---|
| 1351 | * the place to find out how to use libpng. See libpng.txt for the
|
|---|
| 1352 | * full explanation, see example.c for the summary. This just provides
|
|---|
| 1353 | * a simple one line description of the use of each function.
|
|---|
| 1354 | */
|
|---|
| 1355 |
|
|---|
| 1356 | /* Returns the version number of the library */
|
|---|
| 1357 | extern PNG_EXPORT(png_uint_32,png_access_version_number) PNGARG((void));
|
|---|
| 1358 |
|
|---|
| 1359 | /* Tell lib we have already handled the first <num_bytes> magic bytes.
|
|---|
| 1360 | * Handling more than 8 bytes from the beginning of the file is an error.
|
|---|
| 1361 | */
|
|---|
| 1362 | extern PNG_EXPORT(void,png_set_sig_bytes) PNGARG((png_structp png_ptr,
|
|---|
| 1363 | int num_bytes));
|
|---|
| 1364 |
|
|---|
| 1365 | /* Check sig[start] through sig[start + num_to_check - 1] to see if it's a
|
|---|
| 1366 | * PNG file. Returns zero if the supplied bytes match the 8-byte PNG
|
|---|
| 1367 | * signature, and non-zero otherwise. Having num_to_check == 0 or
|
|---|
| 1368 | * start > 7 will always fail (ie return non-zero).
|
|---|
| 1369 | */
|
|---|
| 1370 | extern PNG_EXPORT(int,png_sig_cmp) PNGARG((png_bytep sig, png_size_t start,
|
|---|
| 1371 | png_size_t num_to_check));
|
|---|
| 1372 |
|
|---|
| 1373 | /* Allocate and initialize png_ptr struct for reading, and any other memory. */
|
|---|
| 1374 | extern PNG_EXPORT(png_structp,png_create_read_struct)
|
|---|
| 1375 | PNGARG((png_const_charp user_png_ver, png_voidp error_ptr,
|
|---|
| 1376 | png_error_ptr error_fn, png_error_ptr warn_fn)) PNG_ALLOCATED;
|
|---|
| 1377 |
|
|---|
| 1378 | /* Allocate and initialize png_ptr struct for writing, and any other memory */
|
|---|
| 1379 | extern PNG_EXPORT(png_structp,png_create_write_struct)
|
|---|
| 1380 | PNGARG((png_const_charp user_png_ver, png_voidp error_ptr,
|
|---|
| 1381 | png_error_ptr error_fn, png_error_ptr warn_fn)) PNG_ALLOCATED;
|
|---|
| 1382 |
|
|---|
| 1383 | #ifdef PNG_WRITE_SUPPORTED
|
|---|
| 1384 | extern PNG_EXPORT(png_size_t,png_get_compression_buffer_size)
|
|---|
| 1385 | PNGARG((png_structp png_ptr));
|
|---|
| 1386 | #endif
|
|---|
| 1387 |
|
|---|
| 1388 | #ifdef PNG_WRITE_SUPPORTED
|
|---|
| 1389 | extern PNG_EXPORT(void,png_set_compression_buffer_size)
|
|---|
| 1390 | PNGARG((png_structp png_ptr, png_size_t size));
|
|---|
| 1391 | #endif
|
|---|
| 1392 |
|
|---|
| 1393 | /* Moved from pngconf.h in 1.4.0 and modified to ensure setjmp/longjmp
|
|---|
| 1394 | * match up.
|
|---|
| 1395 | */
|
|---|
| 1396 | #ifdef PNG_SETJMP_SUPPORTED
|
|---|
| 1397 | /* This function returns the jmp_buf built in to *png_ptr. It must be
|
|---|
| 1398 | * supplied with an appropriate 'longjmp' function to use on that jmp_buf
|
|---|
| 1399 | * unless the default error function is overridden in which case NULL is
|
|---|
| 1400 | * acceptable. The size of the jmp_buf is checked against the actual size
|
|---|
| 1401 | * allocated by the library - the call will return NULL on a mismatch
|
|---|
| 1402 | * indicating an ABI mismatch.
|
|---|
| 1403 | */
|
|---|
| 1404 | extern PNG_EXPORT(jmp_buf*, png_set_longjmp_fn)
|
|---|
| 1405 | PNGARG((png_structp png_ptr, png_longjmp_ptr longjmp_fn, size_t jmp_buf_size));
|
|---|
| 1406 | # define png_jmpbuf(png_ptr) \
|
|---|
| 1407 | (*png_set_longjmp_fn((png_ptr), longjmp, sizeof (jmp_buf)))
|
|---|
| 1408 | #else
|
|---|
| 1409 | # define png_jmpbuf(png_ptr) \
|
|---|
| 1410 | (LIBPNG_WAS_COMPILED_WITH__PNG_NO_SETJMP)
|
|---|
| 1411 | #endif
|
|---|
| 1412 |
|
|---|
| 1413 | /* Reset the compression stream */
|
|---|
| 1414 | extern PNG_EXPORT(int,png_reset_zstream) PNGARG((png_structp png_ptr));
|
|---|
| 1415 |
|
|---|
| 1416 | /* New functions added in libpng-1.0.2 (not enabled by default until 1.2.0) */
|
|---|
| 1417 | #ifdef PNG_USER_MEM_SUPPORTED
|
|---|
| 1418 | extern PNG_EXPORT(png_structp,png_create_read_struct_2)
|
|---|
| 1419 | PNGARG((png_const_charp user_png_ver, png_voidp error_ptr,
|
|---|
| 1420 | png_error_ptr error_fn, png_error_ptr warn_fn, png_voidp mem_ptr,
|
|---|
| 1421 | png_malloc_ptr malloc_fn, png_free_ptr free_fn)) PNG_ALLOCATED;
|
|---|
| 1422 | extern PNG_EXPORT(png_structp,png_create_write_struct_2)
|
|---|
| 1423 | PNGARG((png_const_charp user_png_ver, png_voidp error_ptr,
|
|---|
| 1424 | png_error_ptr error_fn, png_error_ptr warn_fn, png_voidp mem_ptr,
|
|---|
| 1425 | png_malloc_ptr malloc_fn, png_free_ptr free_fn)) PNG_ALLOCATED;
|
|---|
| 1426 | #endif
|
|---|
| 1427 |
|
|---|
| 1428 | /* Write the PNG file signature. */
|
|---|
| 1429 | extern PNG_EXPORT(void,png_write_sig) PNGARG((png_structp png_ptr));
|
|---|
| 1430 |
|
|---|
| 1431 | /* Write a PNG chunk - size, type, (optional) data, CRC. */
|
|---|
| 1432 | extern PNG_EXPORT(void,png_write_chunk) PNGARG((png_structp png_ptr,
|
|---|
| 1433 | png_bytep chunk_name, png_bytep data, png_size_t length));
|
|---|
| 1434 |
|
|---|
| 1435 | /* Write the start of a PNG chunk - length and chunk name. */
|
|---|
| 1436 | extern PNG_EXPORT(void,png_write_chunk_start) PNGARG((png_structp png_ptr,
|
|---|
| 1437 | png_bytep chunk_name, png_uint_32 length));
|
|---|
| 1438 |
|
|---|
| 1439 | /* Write the data of a PNG chunk started with png_write_chunk_start(). */
|
|---|
| 1440 | extern PNG_EXPORT(void,png_write_chunk_data) PNGARG((png_structp png_ptr,
|
|---|
| 1441 | png_bytep data, png_size_t length));
|
|---|
| 1442 |
|
|---|
| 1443 | /* Finish a chunk started with png_write_chunk_start() (includes CRC). */
|
|---|
| 1444 | extern PNG_EXPORT(void,png_write_chunk_end) PNGARG((png_structp png_ptr));
|
|---|
| 1445 |
|
|---|
| 1446 | /* Allocate and initialize the info structure */
|
|---|
| 1447 | extern PNG_EXPORT(png_infop,png_create_info_struct)
|
|---|
| 1448 | PNGARG((png_structp png_ptr)) PNG_ALLOCATED;
|
|---|
| 1449 |
|
|---|
| 1450 | extern PNG_EXPORT(void,png_info_init_3) PNGARG((png_infopp info_ptr,
|
|---|
| 1451 | png_size_t png_info_struct_size));
|
|---|
| 1452 |
|
|---|
| 1453 | /* Writes all the PNG information before the image. */
|
|---|
| 1454 | extern PNG_EXPORT(void,png_write_info_before_PLTE) PNGARG((png_structp png_ptr,
|
|---|
| 1455 | png_infop info_ptr));
|
|---|
| 1456 | extern PNG_EXPORT(void,png_write_info) PNGARG((png_structp png_ptr,
|
|---|
| 1457 | png_infop info_ptr));
|
|---|
| 1458 |
|
|---|
| 1459 | #ifdef PNG_SEQUENTIAL_READ_SUPPORTED
|
|---|
| 1460 | /* Read the information before the actual image data. */
|
|---|
| 1461 | extern PNG_EXPORT(void,png_read_info) PNGARG((png_structp png_ptr,
|
|---|
| 1462 | png_infop info_ptr));
|
|---|
| 1463 | #endif
|
|---|
| 1464 |
|
|---|
| 1465 | #ifdef PNG_TIME_RFC1123_SUPPORTED
|
|---|
| 1466 | extern PNG_EXPORT(png_charp,png_convert_to_rfc1123)
|
|---|
| 1467 | PNGARG((png_structp png_ptr, png_timep ptime));
|
|---|
| 1468 | #endif
|
|---|
| 1469 |
|
|---|
| 1470 | #ifdef PNG_CONVERT_tIME_SUPPORTED
|
|---|
| 1471 | /* Convert from a struct tm to png_time */
|
|---|
| 1472 | extern PNG_EXPORT(void,png_convert_from_struct_tm) PNGARG((png_timep ptime,
|
|---|
| 1473 | struct tm FAR * ttime));
|
|---|
| 1474 |
|
|---|
| 1475 | /* Convert from time_t to png_time. Uses gmtime() */
|
|---|
| 1476 | extern PNG_EXPORT(void,png_convert_from_time_t) PNGARG((png_timep ptime,
|
|---|
| 1477 | time_t ttime));
|
|---|
| 1478 | #endif /* PNG_CONVERT_tIME_SUPPORTED */
|
|---|
| 1479 |
|
|---|
| 1480 | #ifdef PNG_READ_EXPAND_SUPPORTED
|
|---|
| 1481 | /* Expand data to 24-bit RGB, or 8-bit grayscale, with alpha if available. */
|
|---|
| 1482 | extern PNG_EXPORT(void,png_set_expand) PNGARG((png_structp png_ptr));
|
|---|
| 1483 | extern PNG_EXPORT(void,png_set_expand_gray_1_2_4_to_8) PNGARG((png_structp
|
|---|
| 1484 | png_ptr));
|
|---|
| 1485 | extern PNG_EXPORT(void,png_set_palette_to_rgb) PNGARG((png_structp png_ptr));
|
|---|
| 1486 | extern PNG_EXPORT(void,png_set_tRNS_to_alpha) PNGARG((png_structp png_ptr));
|
|---|
| 1487 | #endif
|
|---|
| 1488 |
|
|---|
| 1489 | #if defined(PNG_READ_BGR_SUPPORTED) || defined(PNG_WRITE_BGR_SUPPORTED)
|
|---|
| 1490 | /* Use blue, green, red order for pixels. */
|
|---|
| 1491 | extern PNG_EXPORT(void,png_set_bgr) PNGARG((png_structp png_ptr));
|
|---|
| 1492 | #endif
|
|---|
| 1493 |
|
|---|
| 1494 | #ifdef PNG_READ_GRAY_TO_RGB_SUPPORTED
|
|---|
| 1495 | /* Expand the grayscale to 24-bit RGB if necessary. */
|
|---|
| 1496 | extern PNG_EXPORT(void,png_set_gray_to_rgb) PNGARG((png_structp png_ptr));
|
|---|
| 1497 | #endif
|
|---|
| 1498 |
|
|---|
| 1499 | #ifdef PNG_READ_RGB_TO_GRAY_SUPPORTED
|
|---|
| 1500 | /* Reduce RGB to grayscale. */
|
|---|
| 1501 | #ifdef PNG_FLOATING_POINT_SUPPORTED
|
|---|
| 1502 | extern PNG_EXPORT(void,png_set_rgb_to_gray) PNGARG((png_structp png_ptr,
|
|---|
| 1503 | int error_action, double red, double green ));
|
|---|
| 1504 | #endif
|
|---|
| 1505 | extern PNG_EXPORT(void,png_set_rgb_to_gray_fixed) PNGARG((png_structp png_ptr,
|
|---|
| 1506 | int error_action, png_fixed_point red, png_fixed_point green ));
|
|---|
| 1507 | extern PNG_EXPORT(png_byte,png_get_rgb_to_gray_status) PNGARG((png_structp
|
|---|
| 1508 | png_ptr));
|
|---|
| 1509 | #endif
|
|---|
| 1510 |
|
|---|
| 1511 | extern PNG_EXPORT(void,png_build_grayscale_palette) PNGARG((int bit_depth,
|
|---|
| 1512 | png_colorp palette));
|
|---|
| 1513 |
|
|---|
| 1514 | #ifdef PNG_READ_STRIP_ALPHA_SUPPORTED
|
|---|
| 1515 | extern PNG_EXPORT(void,png_set_strip_alpha) PNGARG((png_structp png_ptr));
|
|---|
| 1516 | #endif
|
|---|
| 1517 |
|
|---|
| 1518 | #if defined(PNG_READ_SWAP_ALPHA_SUPPORTED) || \
|
|---|
| 1519 | defined(PNG_WRITE_SWAP_ALPHA_SUPPORTED)
|
|---|
| 1520 | extern PNG_EXPORT(void,png_set_swap_alpha) PNGARG((png_structp png_ptr));
|
|---|
| 1521 | #endif
|
|---|
| 1522 |
|
|---|
| 1523 | #if defined(PNG_READ_INVERT_ALPHA_SUPPORTED) || \
|
|---|
| 1524 | defined(PNG_WRITE_INVERT_ALPHA_SUPPORTED)
|
|---|
| 1525 | extern PNG_EXPORT(void,png_set_invert_alpha) PNGARG((png_structp png_ptr));
|
|---|
| 1526 | #endif
|
|---|
| 1527 |
|
|---|
| 1528 | #if defined(PNG_READ_FILLER_SUPPORTED) || defined(PNG_WRITE_FILLER_SUPPORTED)
|
|---|
| 1529 | /* Add a filler byte to 8-bit Gray or 24-bit RGB images. */
|
|---|
| 1530 | extern PNG_EXPORT(void,png_set_filler) PNGARG((png_structp png_ptr,
|
|---|
| 1531 | png_uint_32 filler, int flags));
|
|---|
| 1532 | /* The values of the PNG_FILLER_ defines should NOT be changed */
|
|---|
| 1533 | #define PNG_FILLER_BEFORE 0
|
|---|
| 1534 | #define PNG_FILLER_AFTER 1
|
|---|
| 1535 | /* Add an alpha byte to 8-bit Gray or 24-bit RGB images. */
|
|---|
| 1536 | extern PNG_EXPORT(void,png_set_add_alpha) PNGARG((png_structp png_ptr,
|
|---|
| 1537 | png_uint_32 filler, int flags));
|
|---|
| 1538 | #endif /* PNG_READ_FILLER_SUPPORTED || PNG_WRITE_FILLER_SUPPORTED */
|
|---|
| 1539 |
|
|---|
| 1540 | #if defined(PNG_READ_SWAP_SUPPORTED) || defined(PNG_WRITE_SWAP_SUPPORTED)
|
|---|
| 1541 | /* Swap bytes in 16-bit depth files. */
|
|---|
| 1542 | extern PNG_EXPORT(void,png_set_swap) PNGARG((png_structp png_ptr));
|
|---|
| 1543 | #endif
|
|---|
| 1544 |
|
|---|
| 1545 | #if defined(PNG_READ_PACK_SUPPORTED) || defined(PNG_WRITE_PACK_SUPPORTED)
|
|---|
| 1546 | /* Use 1 byte per pixel in 1, 2, or 4-bit depth files. */
|
|---|
| 1547 | extern PNG_EXPORT(void,png_set_packing) PNGARG((png_structp png_ptr));
|
|---|
| 1548 | #endif
|
|---|
| 1549 |
|
|---|
| 1550 | #if defined(PNG_READ_PACKSWAP_SUPPORTED) || defined(PNG_WRITE_PACKSWAP_SUPPORTED)
|
|---|
| 1551 | /* Swap packing order of pixels in bytes. */
|
|---|
| 1552 | extern PNG_EXPORT(void,png_set_packswap) PNGARG((png_structp png_ptr));
|
|---|
| 1553 | #endif
|
|---|
| 1554 |
|
|---|
| 1555 | #if defined(PNG_READ_SHIFT_SUPPORTED) || defined(PNG_WRITE_SHIFT_SUPPORTED)
|
|---|
| 1556 | /* Converts files to legal bit depths. */
|
|---|
| 1557 | extern PNG_EXPORT(void,png_set_shift) PNGARG((png_structp png_ptr,
|
|---|
| 1558 | png_color_8p true_bits));
|
|---|
| 1559 | #endif
|
|---|
| 1560 |
|
|---|
| 1561 | #if defined(PNG_READ_INTERLACING_SUPPORTED) || \
|
|---|
| 1562 | defined(PNG_WRITE_INTERLACING_SUPPORTED)
|
|---|
| 1563 | /* Have the code handle the interlacing. Returns the number of passes. */
|
|---|
| 1564 | extern PNG_EXPORT(int,png_set_interlace_handling) PNGARG((png_structp png_ptr));
|
|---|
| 1565 | #endif
|
|---|
| 1566 |
|
|---|
| 1567 | #if defined(PNG_READ_INVERT_SUPPORTED) || defined(PNG_WRITE_INVERT_SUPPORTED)
|
|---|
| 1568 | /* Invert monochrome files */
|
|---|
| 1569 | extern PNG_EXPORT(void,png_set_invert_mono) PNGARG((png_structp png_ptr));
|
|---|
| 1570 | #endif
|
|---|
| 1571 |
|
|---|
| 1572 | #ifdef PNG_READ_BACKGROUND_SUPPORTED
|
|---|
| 1573 | /* Handle alpha and tRNS by replacing with a background color. */
|
|---|
| 1574 | #ifdef PNG_FLOATING_POINT_SUPPORTED
|
|---|
| 1575 | extern PNG_EXPORT(void,png_set_background) PNGARG((png_structp png_ptr,
|
|---|
| 1576 | png_color_16p background_color, int background_gamma_code,
|
|---|
| 1577 | int need_expand, double background_gamma));
|
|---|
| 1578 | #endif
|
|---|
| 1579 | #define PNG_BACKGROUND_GAMMA_UNKNOWN 0
|
|---|
| 1580 | #define PNG_BACKGROUND_GAMMA_SCREEN 1
|
|---|
| 1581 | #define PNG_BACKGROUND_GAMMA_FILE 2
|
|---|
| 1582 | #define PNG_BACKGROUND_GAMMA_UNIQUE 3
|
|---|
| 1583 | #endif
|
|---|
| 1584 |
|
|---|
| 1585 | #ifdef PNG_READ_16_TO_8_SUPPORTED
|
|---|
| 1586 | /* Strip the second byte of information from a 16-bit depth file. */
|
|---|
| 1587 | extern PNG_EXPORT(void,png_set_strip_16) PNGARG((png_structp png_ptr));
|
|---|
| 1588 | #endif
|
|---|
| 1589 |
|
|---|
| 1590 | #ifdef PNG_READ_DITHER_SUPPORTED
|
|---|
| 1591 | /* Turn on dithering, and reduce the palette to the number of colors available. */
|
|---|
| 1592 | extern PNG_EXPORT(void,png_set_dither) PNGARG((png_structp png_ptr,
|
|---|
| 1593 | png_colorp palette, int num_palette, int maximum_colors,
|
|---|
| 1594 | png_uint_16p histogram, int full_dither));
|
|---|
| 1595 | #endif
|
|---|
| 1596 |
|
|---|
| 1597 | #ifdef PNG_READ_GAMMA_SUPPORTED
|
|---|
| 1598 | /* Handle gamma correction. Screen_gamma=(display_exponent) */
|
|---|
| 1599 | #ifdef PNG_FLOATING_POINT_SUPPORTED
|
|---|
| 1600 | extern PNG_EXPORT(void,png_set_gamma) PNGARG((png_structp png_ptr,
|
|---|
| 1601 | double screen_gamma, double default_file_gamma));
|
|---|
| 1602 | #endif
|
|---|
| 1603 | #endif
|
|---|
| 1604 |
|
|---|
| 1605 |
|
|---|
| 1606 | #ifdef PNG_WRITE_FLUSH_SUPPORTED
|
|---|
| 1607 | /* Set how many lines between output flushes - 0 for no flushing */
|
|---|
| 1608 | extern PNG_EXPORT(void,png_set_flush) PNGARG((png_structp png_ptr, int nrows));
|
|---|
| 1609 | /* Flush the current PNG output buffer */
|
|---|
| 1610 | extern PNG_EXPORT(void,png_write_flush) PNGARG((png_structp png_ptr));
|
|---|
| 1611 | #endif
|
|---|
| 1612 |
|
|---|
| 1613 | /* Optional update palette with requested transformations */
|
|---|
| 1614 | extern PNG_EXPORT(void,png_start_read_image) PNGARG((png_structp png_ptr));
|
|---|
| 1615 |
|
|---|
| 1616 | /* Optional call to update the users info structure */
|
|---|
| 1617 | extern PNG_EXPORT(void,png_read_update_info) PNGARG((png_structp png_ptr,
|
|---|
| 1618 | png_infop info_ptr));
|
|---|
| 1619 |
|
|---|
| 1620 | #ifdef PNG_SEQUENTIAL_READ_SUPPORTED
|
|---|
| 1621 | /* Read one or more rows of image data. */
|
|---|
| 1622 | extern PNG_EXPORT(void,png_read_rows) PNGARG((png_structp png_ptr,
|
|---|
| 1623 | png_bytepp row, png_bytepp display_row, png_uint_32 num_rows));
|
|---|
| 1624 | #endif
|
|---|
| 1625 |
|
|---|
| 1626 | #ifdef PNG_SEQUENTIAL_READ_SUPPORTED
|
|---|
| 1627 | /* Read a row of data. */
|
|---|
| 1628 | extern PNG_EXPORT(void,png_read_row) PNGARG((png_structp png_ptr,
|
|---|
| 1629 | png_bytep row,
|
|---|
| 1630 | png_bytep display_row));
|
|---|
| 1631 | #endif
|
|---|
| 1632 |
|
|---|
| 1633 | #ifdef PNG_SEQUENTIAL_READ_SUPPORTED
|
|---|
| 1634 | /* Read the whole image into memory at once. */
|
|---|
| 1635 | extern PNG_EXPORT(void,png_read_image) PNGARG((png_structp png_ptr,
|
|---|
| 1636 | png_bytepp image));
|
|---|
| 1637 | #endif
|
|---|
| 1638 |
|
|---|
| 1639 | /* Write a row of image data */
|
|---|
| 1640 | extern PNG_EXPORT(void,png_write_row) PNGARG((png_structp png_ptr,
|
|---|
| 1641 | png_bytep row));
|
|---|
| 1642 |
|
|---|
| 1643 | /* Write a few rows of image data */
|
|---|
| 1644 | extern PNG_EXPORT(void,png_write_rows) PNGARG((png_structp png_ptr,
|
|---|
| 1645 | png_bytepp row, png_uint_32 num_rows));
|
|---|
| 1646 |
|
|---|
| 1647 | /* Write the image data */
|
|---|
| 1648 | extern PNG_EXPORT(void,png_write_image) PNGARG((png_structp png_ptr,
|
|---|
| 1649 | png_bytepp image));
|
|---|
| 1650 |
|
|---|
| 1651 | /* Write the end of the PNG file. */
|
|---|
| 1652 | extern PNG_EXPORT(void,png_write_end) PNGARG((png_structp png_ptr,
|
|---|
| 1653 | png_infop info_ptr));
|
|---|
| 1654 |
|
|---|
| 1655 | #ifdef PNG_SEQUENTIAL_READ_SUPPORTED
|
|---|
| 1656 | /* Read the end of the PNG file. */
|
|---|
| 1657 | extern PNG_EXPORT(void,png_read_end) PNGARG((png_structp png_ptr,
|
|---|
| 1658 | png_infop info_ptr));
|
|---|
| 1659 | #endif
|
|---|
| 1660 |
|
|---|
| 1661 | /* Free any memory associated with the png_info_struct */
|
|---|
| 1662 | extern PNG_EXPORT(void,png_destroy_info_struct) PNGARG((png_structp png_ptr,
|
|---|
| 1663 | png_infopp info_ptr_ptr));
|
|---|
| 1664 |
|
|---|
| 1665 | /* Free any memory associated with the png_struct and the png_info_structs */
|
|---|
| 1666 | extern PNG_EXPORT(void,png_destroy_read_struct) PNGARG((png_structpp
|
|---|
| 1667 | png_ptr_ptr, png_infopp info_ptr_ptr, png_infopp end_info_ptr_ptr));
|
|---|
| 1668 |
|
|---|
| 1669 | /* Free any memory associated with the png_struct and the png_info_structs */
|
|---|
| 1670 | extern PNG_EXPORT(void,png_destroy_write_struct)
|
|---|
| 1671 | PNGARG((png_structpp png_ptr_ptr, png_infopp info_ptr_ptr));
|
|---|
| 1672 |
|
|---|
| 1673 | /* Set the libpng method of handling chunk CRC errors */
|
|---|
| 1674 | extern PNG_EXPORT(void,png_set_crc_action) PNGARG((png_structp png_ptr,
|
|---|
| 1675 | int crit_action, int ancil_action));
|
|---|
| 1676 |
|
|---|
| 1677 | /* Values for png_set_crc_action() to say how to handle CRC errors in
|
|---|
| 1678 | * ancillary and critical chunks, and whether to use the data contained
|
|---|
| 1679 | * therein. Note that it is impossible to "discard" data in a critical
|
|---|
| 1680 | * chunk. For versions prior to 0.90, the action was always error/quit,
|
|---|
| 1681 | * whereas in version 0.90 and later, the action for CRC errors in ancillary
|
|---|
| 1682 | * chunks is warn/discard. These values should NOT be changed.
|
|---|
| 1683 | *
|
|---|
| 1684 | * value action:critical action:ancillary
|
|---|
| 1685 | */
|
|---|
| 1686 | #define PNG_CRC_DEFAULT 0 /* error/quit warn/discard data */
|
|---|
| 1687 | #define PNG_CRC_ERROR_QUIT 1 /* error/quit error/quit */
|
|---|
| 1688 | #define PNG_CRC_WARN_DISCARD 2 /* (INVALID) warn/discard data */
|
|---|
| 1689 | #define PNG_CRC_WARN_USE 3 /* warn/use data warn/use data */
|
|---|
| 1690 | #define PNG_CRC_QUIET_USE 4 /* quiet/use data quiet/use data */
|
|---|
| 1691 | #define PNG_CRC_NO_CHANGE 5 /* use current value use current value */
|
|---|
| 1692 |
|
|---|
| 1693 | /* These functions give the user control over the scan-line filtering in
|
|---|
| 1694 | * libpng and the compression methods used by zlib. These functions are
|
|---|
| 1695 | * mainly useful for testing, as the defaults should work with most users.
|
|---|
| 1696 | * Those users who are tight on memory or want faster performance at the
|
|---|
| 1697 | * expense of compression can modify them. See the compression library
|
|---|
| 1698 | * header file (zlib.h) for an explination of the compression functions.
|
|---|
| 1699 | */
|
|---|
| 1700 |
|
|---|
| 1701 | /* Set the filtering method(s) used by libpng. Currently, the only valid
|
|---|
| 1702 | * value for "method" is 0.
|
|---|
| 1703 | */
|
|---|
| 1704 | extern PNG_EXPORT(void,png_set_filter) PNGARG((png_structp png_ptr, int method,
|
|---|
| 1705 | int filters));
|
|---|
| 1706 |
|
|---|
| 1707 | /* Flags for png_set_filter() to say which filters to use. The flags
|
|---|
| 1708 | * are chosen so that they don't conflict with real filter types
|
|---|
| 1709 | * below, in case they are supplied instead of the #defined constants.
|
|---|
| 1710 | * These values should NOT be changed.
|
|---|
| 1711 | */
|
|---|
| 1712 | #define PNG_NO_FILTERS 0x00
|
|---|
| 1713 | #define PNG_FILTER_NONE 0x08
|
|---|
| 1714 | #define PNG_FILTER_SUB 0x10
|
|---|
| 1715 | #define PNG_FILTER_UP 0x20
|
|---|
| 1716 | #define PNG_FILTER_AVG 0x40
|
|---|
| 1717 | #define PNG_FILTER_PAETH 0x80
|
|---|
| 1718 | #define PNG_ALL_FILTERS (PNG_FILTER_NONE | PNG_FILTER_SUB | PNG_FILTER_UP | \
|
|---|
| 1719 | PNG_FILTER_AVG | PNG_FILTER_PAETH)
|
|---|
| 1720 |
|
|---|
| 1721 | /* Filter values (not flags) - used in pngwrite.c, pngwutil.c for now.
|
|---|
| 1722 | * These defines should NOT be changed.
|
|---|
| 1723 | */
|
|---|
| 1724 | #define PNG_FILTER_VALUE_NONE 0
|
|---|
| 1725 | #define PNG_FILTER_VALUE_SUB 1
|
|---|
| 1726 | #define PNG_FILTER_VALUE_UP 2
|
|---|
| 1727 | #define PNG_FILTER_VALUE_AVG 3
|
|---|
| 1728 | #define PNG_FILTER_VALUE_PAETH 4
|
|---|
| 1729 | #define PNG_FILTER_VALUE_LAST 5
|
|---|
| 1730 |
|
|---|
| 1731 | #ifdef PNG_WRITE_WEIGHTED_FILTER_SUPPORTED /* EXPERIMENTAL */
|
|---|
| 1732 | /* The "heuristic_method" is given by one of the PNG_FILTER_HEURISTIC_
|
|---|
| 1733 | * defines, either the default (minimum-sum-of-absolute-differences), or
|
|---|
| 1734 | * the experimental method (weighted-minimum-sum-of-absolute-differences).
|
|---|
| 1735 | *
|
|---|
| 1736 | * Weights are factors >= 1.0, indicating how important it is to keep the
|
|---|
| 1737 | * filter type consistent between rows. Larger numbers mean the current
|
|---|
| 1738 | * filter is that many times as likely to be the same as the "num_weights"
|
|---|
| 1739 | * previous filters. This is cumulative for each previous row with a weight.
|
|---|
| 1740 | * There needs to be "num_weights" values in "filter_weights", or it can be
|
|---|
| 1741 | * NULL if the weights aren't being specified. Weights have no influence on
|
|---|
| 1742 | * the selection of the first row filter. Well chosen weights can (in theory)
|
|---|
| 1743 | * improve the compression for a given image.
|
|---|
| 1744 | *
|
|---|
| 1745 | * Costs are factors >= 1.0 indicating the relative decoding costs of a
|
|---|
| 1746 | * filter type. Higher costs indicate more decoding expense, and are
|
|---|
| 1747 | * therefore less likely to be selected over a filter with lower computational
|
|---|
| 1748 | * costs. There needs to be a value in "filter_costs" for each valid filter
|
|---|
| 1749 | * type (given by PNG_FILTER_VALUE_LAST), or it can be NULL if you aren't
|
|---|
| 1750 | * setting the costs. Costs try to improve the speed of decompression without
|
|---|
| 1751 | * unduly increasing the compressed image size.
|
|---|
| 1752 | *
|
|---|
| 1753 | * A negative weight or cost indicates the default value is to be used, and
|
|---|
| 1754 | * values in the range [0.0, 1.0) indicate the value is to remain unchanged.
|
|---|
| 1755 | * The default values for both weights and costs are currently 1.0, but may
|
|---|
| 1756 | * change if good general weighting/cost heuristics can be found. If both
|
|---|
| 1757 | * the weights and costs are set to 1.0, this degenerates the WEIGHTED method
|
|---|
| 1758 | * to the UNWEIGHTED method, but with added encoding time/computation.
|
|---|
| 1759 | */
|
|---|
| 1760 | #ifdef PNG_FLOATING_POINT_SUPPORTED
|
|---|
| 1761 | extern PNG_EXPORT(void,png_set_filter_heuristics) PNGARG((png_structp png_ptr,
|
|---|
| 1762 | int heuristic_method, int num_weights, png_doublep filter_weights,
|
|---|
| 1763 | png_doublep filter_costs));
|
|---|
| 1764 | #endif
|
|---|
| 1765 | #endif /* PNG_WRITE_WEIGHTED_FILTER_SUPPORTED */
|
|---|
| 1766 |
|
|---|
| 1767 | /* Heuristic used for row filter selection. These defines should NOT be
|
|---|
| 1768 | * changed.
|
|---|
| 1769 | */
|
|---|
| 1770 | #define PNG_FILTER_HEURISTIC_DEFAULT 0 /* Currently "UNWEIGHTED" */
|
|---|
| 1771 | #define PNG_FILTER_HEURISTIC_UNWEIGHTED 1 /* Used by libpng < 0.95 */
|
|---|
| 1772 | #define PNG_FILTER_HEURISTIC_WEIGHTED 2 /* Experimental feature */
|
|---|
| 1773 | #define PNG_FILTER_HEURISTIC_LAST 3 /* Not a valid value */
|
|---|
| 1774 |
|
|---|
| 1775 | /* Set the library compression level. Currently, valid values range from
|
|---|
| 1776 | * 0 - 9, corresponding directly to the zlib compression levels 0 - 9
|
|---|
| 1777 | * (0 - no compression, 9 - "maximal" compression). Note that tests have
|
|---|
| 1778 | * shown that zlib compression levels 3-6 usually perform as well as level 9
|
|---|
| 1779 | * for PNG images, and do considerably fewer caclulations. In the future,
|
|---|
| 1780 | * these values may not correspond directly to the zlib compression levels.
|
|---|
| 1781 | */
|
|---|
| 1782 | extern PNG_EXPORT(void,png_set_compression_level) PNGARG((png_structp png_ptr,
|
|---|
| 1783 | int level));
|
|---|
| 1784 |
|
|---|
| 1785 | extern PNG_EXPORT(void,png_set_compression_mem_level)
|
|---|
| 1786 | PNGARG((png_structp png_ptr, int mem_level));
|
|---|
| 1787 |
|
|---|
| 1788 | extern PNG_EXPORT(void,png_set_compression_strategy)
|
|---|
| 1789 | PNGARG((png_structp png_ptr, int strategy));
|
|---|
| 1790 |
|
|---|
| 1791 | extern PNG_EXPORT(void,png_set_compression_window_bits)
|
|---|
| 1792 | PNGARG((png_structp png_ptr, int window_bits));
|
|---|
| 1793 |
|
|---|
| 1794 | extern PNG_EXPORT(void,png_set_compression_method) PNGARG((png_structp png_ptr,
|
|---|
| 1795 | int method));
|
|---|
| 1796 |
|
|---|
| 1797 | /* These next functions are called for input/output, memory, and error
|
|---|
| 1798 | * handling. They are in the file pngrio.c, pngwio.c, and pngerror.c,
|
|---|
| 1799 | * and call standard C I/O routines such as fread(), fwrite(), and
|
|---|
| 1800 | * fprintf(). These functions can be made to use other I/O routines
|
|---|
| 1801 | * at run time for those applications that need to handle I/O in a
|
|---|
| 1802 | * different manner by calling png_set_???_fn(). See libpng.txt for
|
|---|
| 1803 | * more information.
|
|---|
| 1804 | */
|
|---|
| 1805 |
|
|---|
| 1806 | #ifdef PNG_STDIO_SUPPORTED
|
|---|
| 1807 | /* Initialize the input/output for the PNG file to the default functions. */
|
|---|
| 1808 | extern PNG_EXPORT(void,png_init_io) PNGARG((png_structp png_ptr, png_FILE_p fp));
|
|---|
| 1809 | #endif
|
|---|
| 1810 |
|
|---|
| 1811 | /* Replace the (error and abort), and warning functions with user
|
|---|
| 1812 | * supplied functions. If no messages are to be printed you must still
|
|---|
| 1813 | * write and use replacement functions. The replacement error_fn should
|
|---|
| 1814 | * still do a longjmp to the last setjmp location if you are using this
|
|---|
| 1815 | * method of error handling. If error_fn or warning_fn is NULL, the
|
|---|
| 1816 | * default function will be used.
|
|---|
| 1817 | */
|
|---|
| 1818 |
|
|---|
| 1819 | extern PNG_EXPORT(void,png_set_error_fn) PNGARG((png_structp png_ptr,
|
|---|
| 1820 | png_voidp error_ptr, png_error_ptr error_fn, png_error_ptr warning_fn));
|
|---|
| 1821 |
|
|---|
| 1822 | /* Return the user pointer associated with the error functions */
|
|---|
| 1823 | extern PNG_EXPORT(png_voidp,png_get_error_ptr) PNGARG((png_structp png_ptr));
|
|---|
| 1824 |
|
|---|
| 1825 | /* Replace the default data output functions with a user supplied one(s).
|
|---|
| 1826 | * If buffered output is not used, then output_flush_fn can be set to NULL.
|
|---|
| 1827 | * If PNG_WRITE_FLUSH_SUPPORTED is not defined at libpng compile time
|
|---|
| 1828 | * output_flush_fn will be ignored (and thus can be NULL).
|
|---|
| 1829 | * It is probably a mistake to use NULL for output_flush_fn if
|
|---|
| 1830 | * write_data_fn is not also NULL unless you have built libpng with
|
|---|
| 1831 | * PNG_WRITE_FLUSH_SUPPORTED undefined, because in this case libpng's
|
|---|
| 1832 | * default flush function, which uses the standard *FILE structure, will
|
|---|
| 1833 | * be used.
|
|---|
| 1834 | */
|
|---|
| 1835 | extern PNG_EXPORT(void,png_set_write_fn) PNGARG((png_structp png_ptr,
|
|---|
| 1836 | png_voidp io_ptr, png_rw_ptr write_data_fn, png_flush_ptr output_flush_fn));
|
|---|
| 1837 |
|
|---|
| 1838 | /* Replace the default data input function with a user supplied one. */
|
|---|
| 1839 | extern PNG_EXPORT(void,png_set_read_fn) PNGARG((png_structp png_ptr,
|
|---|
| 1840 | png_voidp io_ptr, png_rw_ptr read_data_fn));
|
|---|
| 1841 |
|
|---|
| 1842 | /* Return the user pointer associated with the I/O functions */
|
|---|
| 1843 | extern PNG_EXPORT(png_voidp,png_get_io_ptr) PNGARG((png_structp png_ptr));
|
|---|
| 1844 |
|
|---|
| 1845 | extern PNG_EXPORT(void,png_set_read_status_fn) PNGARG((png_structp png_ptr,
|
|---|
| 1846 | png_read_status_ptr read_row_fn));
|
|---|
| 1847 |
|
|---|
| 1848 | extern PNG_EXPORT(void,png_set_write_status_fn) PNGARG((png_structp png_ptr,
|
|---|
| 1849 | png_write_status_ptr write_row_fn));
|
|---|
| 1850 |
|
|---|
| 1851 | #ifdef PNG_USER_MEM_SUPPORTED
|
|---|
| 1852 | /* Replace the default memory allocation functions with user supplied one(s). */
|
|---|
| 1853 | extern PNG_EXPORT(void,png_set_mem_fn) PNGARG((png_structp png_ptr,
|
|---|
| 1854 | png_voidp mem_ptr, png_malloc_ptr malloc_fn, png_free_ptr free_fn));
|
|---|
| 1855 | /* Return the user pointer associated with the memory functions */
|
|---|
| 1856 | extern PNG_EXPORT(png_voidp,png_get_mem_ptr) PNGARG((png_structp png_ptr));
|
|---|
| 1857 | #endif
|
|---|
| 1858 |
|
|---|
| 1859 | #ifdef PNG_READ_USER_TRANSFORM_SUPPORTED
|
|---|
| 1860 | extern PNG_EXPORT(void,png_set_read_user_transform_fn) PNGARG((png_structp
|
|---|
| 1861 | png_ptr, png_user_transform_ptr read_user_transform_fn));
|
|---|
| 1862 | #endif
|
|---|
| 1863 |
|
|---|
| 1864 | #ifdef PNG_WRITE_USER_TRANSFORM_SUPPORTED
|
|---|
| 1865 | extern PNG_EXPORT(void,png_set_write_user_transform_fn) PNGARG((png_structp
|
|---|
| 1866 | png_ptr, png_user_transform_ptr write_user_transform_fn));
|
|---|
| 1867 | #endif
|
|---|
| 1868 |
|
|---|
| 1869 | #if defined(PNG_READ_USER_TRANSFORM_SUPPORTED) || \
|
|---|
| 1870 | defined(PNG_WRITE_USER_TRANSFORM_SUPPORTED)
|
|---|
| 1871 | extern PNG_EXPORT(void,png_set_user_transform_info) PNGARG((png_structp
|
|---|
| 1872 | png_ptr, png_voidp user_transform_ptr, int user_transform_depth,
|
|---|
| 1873 | int user_transform_channels));
|
|---|
| 1874 | /* Return the user pointer associated with the user transform functions */
|
|---|
| 1875 | extern PNG_EXPORT(png_voidp,png_get_user_transform_ptr)
|
|---|
| 1876 | PNGARG((png_structp png_ptr));
|
|---|
| 1877 | #endif
|
|---|
| 1878 |
|
|---|
| 1879 | #ifdef PNG_USER_CHUNKS_SUPPORTED
|
|---|
| 1880 | extern PNG_EXPORT(void,png_set_read_user_chunk_fn) PNGARG((png_structp png_ptr,
|
|---|
| 1881 | png_voidp user_chunk_ptr, png_user_chunk_ptr read_user_chunk_fn));
|
|---|
| 1882 | extern PNG_EXPORT(png_voidp,png_get_user_chunk_ptr) PNGARG((png_structp
|
|---|
| 1883 | png_ptr));
|
|---|
| 1884 | #endif
|
|---|
| 1885 |
|
|---|
| 1886 | #ifdef PNG_PROGRESSIVE_READ_SUPPORTED
|
|---|
| 1887 | /* Sets the function callbacks for the push reader, and a pointer to a
|
|---|
| 1888 | * user-defined structure available to the callback functions.
|
|---|
| 1889 | */
|
|---|
| 1890 | extern PNG_EXPORT(void,png_set_progressive_read_fn) PNGARG((png_structp png_ptr,
|
|---|
| 1891 | png_voidp progressive_ptr,
|
|---|
| 1892 | png_progressive_info_ptr info_fn, png_progressive_row_ptr row_fn,
|
|---|
| 1893 | png_progressive_end_ptr end_fn));
|
|---|
| 1894 |
|
|---|
| 1895 | /* Returns the user pointer associated with the push read functions */
|
|---|
| 1896 | extern PNG_EXPORT(png_voidp,png_get_progressive_ptr)
|
|---|
| 1897 | PNGARG((png_structp png_ptr));
|
|---|
| 1898 |
|
|---|
| 1899 | /* Function to be called when data becomes available */
|
|---|
| 1900 | extern PNG_EXPORT(void,png_process_data) PNGARG((png_structp png_ptr,
|
|---|
| 1901 | png_infop info_ptr, png_bytep buffer, png_size_t buffer_size));
|
|---|
| 1902 |
|
|---|
| 1903 | /* Function that combines rows. Not very much different than the
|
|---|
| 1904 | * png_combine_row() call. Is this even used?????
|
|---|
| 1905 | */
|
|---|
| 1906 | extern PNG_EXPORT(void,png_progressive_combine_row) PNGARG((png_structp png_ptr,
|
|---|
| 1907 | png_bytep old_row, png_bytep new_row));
|
|---|
| 1908 | #endif /* PNG_PROGRESSIVE_READ_SUPPORTED */
|
|---|
| 1909 |
|
|---|
| 1910 | extern PNG_EXPORT(png_voidp,png_malloc) PNGARG((png_structp png_ptr,
|
|---|
| 1911 | png_alloc_size_t size)) PNG_ALLOCATED;
|
|---|
| 1912 | /* Added at libpng version 1.4.0 */
|
|---|
| 1913 | extern PNG_EXPORT(png_voidp,png_calloc) PNGARG((png_structp png_ptr,
|
|---|
| 1914 | png_alloc_size_t size)) PNG_ALLOCATED;
|
|---|
| 1915 |
|
|---|
| 1916 | /* Added at libpng version 1.2.4 */
|
|---|
| 1917 | extern PNG_EXPORT(png_voidp,png_malloc_warn) PNGARG((png_structp png_ptr,
|
|---|
| 1918 | png_alloc_size_t size)) PNG_ALLOCATED;
|
|---|
| 1919 |
|
|---|
| 1920 | /* Frees a pointer allocated by png_malloc() */
|
|---|
| 1921 | extern PNG_EXPORT(void,png_free) PNGARG((png_structp png_ptr, png_voidp ptr));
|
|---|
| 1922 |
|
|---|
| 1923 | /* Free data that was allocated internally */
|
|---|
| 1924 | extern PNG_EXPORT(void,png_free_data) PNGARG((png_structp png_ptr,
|
|---|
| 1925 | png_infop info_ptr, png_uint_32 free_me, int num));
|
|---|
| 1926 | /* Reassign responsibility for freeing existing data, whether allocated
|
|---|
| 1927 | * by libpng or by the application */
|
|---|
| 1928 | extern PNG_EXPORT(void,png_data_freer) PNGARG((png_structp png_ptr,
|
|---|
| 1929 | png_infop info_ptr, int freer, png_uint_32 mask));
|
|---|
| 1930 | /* Assignments for png_data_freer */
|
|---|
| 1931 | #define PNG_DESTROY_WILL_FREE_DATA 1
|
|---|
| 1932 | #define PNG_SET_WILL_FREE_DATA 1
|
|---|
| 1933 | #define PNG_USER_WILL_FREE_DATA 2
|
|---|
| 1934 | /* Flags for png_ptr->free_me and info_ptr->free_me */
|
|---|
| 1935 | #define PNG_FREE_HIST 0x0008
|
|---|
| 1936 | #define PNG_FREE_ICCP 0x0010
|
|---|
| 1937 | #define PNG_FREE_SPLT 0x0020
|
|---|
| 1938 | #define PNG_FREE_ROWS 0x0040
|
|---|
| 1939 | #define PNG_FREE_PCAL 0x0080
|
|---|
| 1940 | #define PNG_FREE_SCAL 0x0100
|
|---|
| 1941 | #define PNG_FREE_UNKN 0x0200
|
|---|
| 1942 | #define PNG_FREE_LIST 0x0400
|
|---|
| 1943 | #define PNG_FREE_PLTE 0x1000
|
|---|
| 1944 | #define PNG_FREE_TRNS 0x2000
|
|---|
| 1945 | #define PNG_FREE_TEXT 0x4000
|
|---|
| 1946 | #define PNG_FREE_ALL 0x7fff
|
|---|
| 1947 | #define PNG_FREE_MUL 0x4220 /* PNG_FREE_SPLT|PNG_FREE_TEXT|PNG_FREE_UNKN */
|
|---|
| 1948 |
|
|---|
| 1949 | #ifdef PNG_USER_MEM_SUPPORTED
|
|---|
| 1950 | extern PNG_EXPORT(png_voidp,png_malloc_default) PNGARG((png_structp png_ptr,
|
|---|
| 1951 | png_alloc_size_t size)) PNG_ALLOCATED;
|
|---|
| 1952 | extern PNG_EXPORT(void,png_free_default) PNGARG((png_structp png_ptr,
|
|---|
| 1953 | png_voidp ptr));
|
|---|
| 1954 | #endif
|
|---|
| 1955 |
|
|---|
| 1956 | #ifndef PNG_NO_ERROR_TEXT
|
|---|
| 1957 | /* Fatal error in PNG image of libpng - can't continue */
|
|---|
| 1958 | extern PNG_EXPORT(void,png_error) PNGARG((png_structp png_ptr,
|
|---|
| 1959 | png_const_charp error_message)) PNG_NORETURN;
|
|---|
| 1960 |
|
|---|
| 1961 | /* The same, but the chunk name is prepended to the error string. */
|
|---|
| 1962 | extern PNG_EXPORT(void,png_chunk_error) PNGARG((png_structp png_ptr,
|
|---|
| 1963 | png_const_charp error_message)) PNG_NORETURN;
|
|---|
| 1964 |
|
|---|
| 1965 | #else
|
|---|
| 1966 | /* Fatal error in PNG image of libpng - can't continue */
|
|---|
| 1967 | extern PNG_EXPORT(void,png_err) PNGARG((png_structp png_ptr)) PNG_NORETURN;
|
|---|
| 1968 | #endif
|
|---|
| 1969 |
|
|---|
| 1970 | /* Non-fatal error in libpng. Can continue, but may have a problem. */
|
|---|
| 1971 | extern PNG_EXPORT(void,png_warning) PNGARG((png_structp png_ptr,
|
|---|
| 1972 | png_const_charp warning_message));
|
|---|
| 1973 |
|
|---|
| 1974 | /* Non-fatal error in libpng, chunk name is prepended to message. */
|
|---|
| 1975 | extern PNG_EXPORT(void,png_chunk_warning) PNGARG((png_structp png_ptr,
|
|---|
| 1976 | png_const_charp warning_message));
|
|---|
| 1977 |
|
|---|
| 1978 | #ifdef PNG_BENIGN_ERRORS_SUPPORTED
|
|---|
| 1979 | /* Benign error in libpng. Can continue, but may have a problem.
|
|---|
| 1980 | * User can choose whether to handle as a fatal error or as a warning. */
|
|---|
| 1981 | extern PNG_EXPORT(void,png_benign_error) PNGARG((png_structp png_ptr,
|
|---|
| 1982 | png_const_charp warning_message));
|
|---|
| 1983 |
|
|---|
| 1984 | /* Same, chunk name is prepended to message. */
|
|---|
| 1985 | extern PNG_EXPORT(void,png_chunk_benign_error) PNGARG((png_structp png_ptr,
|
|---|
| 1986 | png_const_charp warning_message));
|
|---|
| 1987 |
|
|---|
| 1988 | extern PNG_EXPORT(void,png_set_benign_errors) PNGARG((png_structp
|
|---|
| 1989 | png_ptr, int allowed));
|
|---|
| 1990 | #endif
|
|---|
| 1991 |
|
|---|
| 1992 | /* The png_set_<chunk> functions are for storing values in the png_info_struct.
|
|---|
| 1993 | * Similarly, the png_get_<chunk> calls are used to read values from the
|
|---|
| 1994 | * png_info_struct, either storing the parameters in the passed variables, or
|
|---|
| 1995 | * setting pointers into the png_info_struct where the data is stored. The
|
|---|
| 1996 | * png_get_<chunk> functions return a non-zero value if the data was available
|
|---|
| 1997 | * in info_ptr, or return zero and do not change any of the parameters if the
|
|---|
| 1998 | * data was not available.
|
|---|
| 1999 | *
|
|---|
| 2000 | * These functions should be used instead of directly accessing png_info
|
|---|
| 2001 | * to avoid problems with future changes in the size and internal layout of
|
|---|
| 2002 | * png_info_struct.
|
|---|
| 2003 | */
|
|---|
| 2004 | /* Returns "flag" if chunk data is valid in info_ptr. */
|
|---|
| 2005 | extern PNG_EXPORT(png_uint_32,png_get_valid) PNGARG((png_structp png_ptr,
|
|---|
| 2006 | png_infop info_ptr, png_uint_32 flag));
|
|---|
| 2007 |
|
|---|
| 2008 | /* Returns number of bytes needed to hold a transformed row. */
|
|---|
| 2009 | extern PNG_EXPORT(png_size_t,png_get_rowbytes) PNGARG((png_structp png_ptr,
|
|---|
| 2010 | png_infop info_ptr));
|
|---|
| 2011 |
|
|---|
| 2012 | #ifdef PNG_INFO_IMAGE_SUPPORTED
|
|---|
| 2013 | /* Returns row_pointers, which is an array of pointers to scanlines that was
|
|---|
| 2014 | * returned from png_read_png().
|
|---|
| 2015 | */
|
|---|
| 2016 | extern PNG_EXPORT(png_bytepp,png_get_rows) PNGARG((png_structp png_ptr,
|
|---|
| 2017 | png_infop info_ptr));
|
|---|
| 2018 | /* Set row_pointers, which is an array of pointers to scanlines for use
|
|---|
| 2019 | * by png_write_png().
|
|---|
| 2020 | */
|
|---|
| 2021 | extern PNG_EXPORT(void,png_set_rows) PNGARG((png_structp png_ptr,
|
|---|
| 2022 | png_infop info_ptr, png_bytepp row_pointers));
|
|---|
| 2023 | #endif
|
|---|
| 2024 |
|
|---|
| 2025 | /* Returns number of color channels in image. */
|
|---|
| 2026 | extern PNG_EXPORT(png_byte,png_get_channels) PNGARG((png_structp png_ptr,
|
|---|
| 2027 | png_infop info_ptr));
|
|---|
| 2028 |
|
|---|
| 2029 | #ifdef PNG_EASY_ACCESS_SUPPORTED
|
|---|
| 2030 | /* Returns image width in pixels. */
|
|---|
| 2031 | extern PNG_EXPORT(png_uint_32, png_get_image_width) PNGARG((png_structp
|
|---|
| 2032 | png_ptr, png_infop info_ptr));
|
|---|
| 2033 |
|
|---|
| 2034 | /* Returns image height in pixels. */
|
|---|
| 2035 | extern PNG_EXPORT(png_uint_32, png_get_image_height) PNGARG((png_structp
|
|---|
| 2036 | png_ptr, png_infop info_ptr));
|
|---|
| 2037 |
|
|---|
| 2038 | /* Returns image bit_depth. */
|
|---|
| 2039 | extern PNG_EXPORT(png_byte, png_get_bit_depth) PNGARG((png_structp
|
|---|
| 2040 | png_ptr, png_infop info_ptr));
|
|---|
| 2041 |
|
|---|
| 2042 | /* Returns image color_type. */
|
|---|
| 2043 | extern PNG_EXPORT(png_byte, png_get_color_type) PNGARG((png_structp
|
|---|
| 2044 | png_ptr, png_infop info_ptr));
|
|---|
| 2045 |
|
|---|
| 2046 | /* Returns image filter_type. */
|
|---|
| 2047 | extern PNG_EXPORT(png_byte, png_get_filter_type) PNGARG((png_structp
|
|---|
| 2048 | png_ptr, png_infop info_ptr));
|
|---|
| 2049 |
|
|---|
| 2050 | /* Returns image interlace_type. */
|
|---|
| 2051 | extern PNG_EXPORT(png_byte, png_get_interlace_type) PNGARG((png_structp
|
|---|
| 2052 | png_ptr, png_infop info_ptr));
|
|---|
| 2053 |
|
|---|
| 2054 | /* Returns image compression_type. */
|
|---|
| 2055 | extern PNG_EXPORT(png_byte, png_get_compression_type) PNGARG((png_structp
|
|---|
| 2056 | png_ptr, png_infop info_ptr));
|
|---|
| 2057 |
|
|---|
| 2058 | /* Returns image resolution in pixels per meter, from pHYs chunk data. */
|
|---|
| 2059 | extern PNG_EXPORT(png_uint_32, png_get_pixels_per_meter) PNGARG((png_structp
|
|---|
| 2060 | png_ptr, png_infop info_ptr));
|
|---|
| 2061 | extern PNG_EXPORT(png_uint_32, png_get_x_pixels_per_meter) PNGARG((png_structp
|
|---|
| 2062 | png_ptr, png_infop info_ptr));
|
|---|
| 2063 | extern PNG_EXPORT(png_uint_32, png_get_y_pixels_per_meter) PNGARG((png_structp
|
|---|
| 2064 | png_ptr, png_infop info_ptr));
|
|---|
| 2065 |
|
|---|
| 2066 | /* Returns pixel aspect ratio, computed from pHYs chunk data. */
|
|---|
| 2067 | #ifdef PNG_FLOATING_POINT_SUPPORTED
|
|---|
| 2068 | extern PNG_EXPORT(float, png_get_pixel_aspect_ratio) PNGARG((png_structp
|
|---|
| 2069 | png_ptr, png_infop info_ptr));
|
|---|
| 2070 | #endif
|
|---|
| 2071 |
|
|---|
| 2072 | /* Returns image x, y offset in pixels or microns, from oFFs chunk data. */
|
|---|
| 2073 | extern PNG_EXPORT(png_int_32, png_get_x_offset_pixels) PNGARG((png_structp
|
|---|
| 2074 | png_ptr, png_infop info_ptr));
|
|---|
| 2075 | extern PNG_EXPORT(png_int_32, png_get_y_offset_pixels) PNGARG((png_structp
|
|---|
| 2076 | png_ptr, png_infop info_ptr));
|
|---|
| 2077 | extern PNG_EXPORT(png_int_32, png_get_x_offset_microns) PNGARG((png_structp
|
|---|
| 2078 | png_ptr, png_infop info_ptr));
|
|---|
| 2079 | extern PNG_EXPORT(png_int_32, png_get_y_offset_microns) PNGARG((png_structp
|
|---|
| 2080 | png_ptr, png_infop info_ptr));
|
|---|
| 2081 |
|
|---|
| 2082 | #endif /* PNG_EASY_ACCESS_SUPPORTED */
|
|---|
| 2083 |
|
|---|
| 2084 | /* Returns pointer to signature string read from PNG header */
|
|---|
| 2085 | extern PNG_EXPORT(png_bytep,png_get_signature) PNGARG((png_structp png_ptr,
|
|---|
| 2086 | png_infop info_ptr));
|
|---|
| 2087 |
|
|---|
| 2088 | #ifdef PNG_bKGD_SUPPORTED
|
|---|
| 2089 | extern PNG_EXPORT(png_uint_32,png_get_bKGD) PNGARG((png_structp png_ptr,
|
|---|
| 2090 | png_infop info_ptr, png_color_16p *background));
|
|---|
| 2091 | #endif
|
|---|
| 2092 |
|
|---|
| 2093 | #ifdef PNG_bKGD_SUPPORTED
|
|---|
| 2094 | extern PNG_EXPORT(void,png_set_bKGD) PNGARG((png_structp png_ptr,
|
|---|
| 2095 | png_infop info_ptr, png_color_16p background));
|
|---|
| 2096 | #endif
|
|---|
| 2097 |
|
|---|
| 2098 | #ifdef PNG_cHRM_SUPPORTED
|
|---|
| 2099 | #ifdef PNG_FLOATING_POINT_SUPPORTED
|
|---|
| 2100 | extern PNG_EXPORT(png_uint_32,png_get_cHRM) PNGARG((png_structp png_ptr,
|
|---|
| 2101 | png_infop info_ptr, double *white_x, double *white_y, double *red_x,
|
|---|
| 2102 | double *red_y, double *green_x, double *green_y, double *blue_x,
|
|---|
| 2103 | double *blue_y));
|
|---|
| 2104 | #endif
|
|---|
| 2105 | #ifdef PNG_FIXED_POINT_SUPPORTED
|
|---|
| 2106 | extern PNG_EXPORT(png_uint_32,png_get_cHRM_fixed) PNGARG((png_structp png_ptr,
|
|---|
| 2107 | png_infop info_ptr, png_fixed_point *int_white_x, png_fixed_point
|
|---|
| 2108 | *int_white_y, png_fixed_point *int_red_x, png_fixed_point *int_red_y,
|
|---|
| 2109 | png_fixed_point *int_green_x, png_fixed_point *int_green_y, png_fixed_point
|
|---|
| 2110 | *int_blue_x, png_fixed_point *int_blue_y));
|
|---|
| 2111 | #endif
|
|---|
| 2112 | #endif
|
|---|
| 2113 |
|
|---|
| 2114 | #ifdef PNG_cHRM_SUPPORTED
|
|---|
| 2115 | #ifdef PNG_FLOATING_POINT_SUPPORTED
|
|---|
| 2116 | extern PNG_EXPORT(void,png_set_cHRM) PNGARG((png_structp png_ptr,
|
|---|
| 2117 | png_infop info_ptr, double white_x, double white_y, double red_x,
|
|---|
| 2118 | double red_y, double green_x, double green_y, double blue_x, double blue_y));
|
|---|
| 2119 | #endif
|
|---|
| 2120 | #ifdef PNG_FIXED_POINT_SUPPORTED
|
|---|
| 2121 | extern PNG_EXPORT(void,png_set_cHRM_fixed) PNGARG((png_structp png_ptr,
|
|---|
| 2122 | png_infop info_ptr, png_fixed_point int_white_x, png_fixed_point int_white_y,
|
|---|
| 2123 | png_fixed_point int_red_x, png_fixed_point int_red_y, png_fixed_point
|
|---|
| 2124 | int_green_x, png_fixed_point int_green_y, png_fixed_point int_blue_x,
|
|---|
| 2125 | png_fixed_point int_blue_y));
|
|---|
| 2126 | #endif
|
|---|
| 2127 | #endif
|
|---|
| 2128 |
|
|---|
| 2129 | #ifdef PNG_gAMA_SUPPORTED
|
|---|
| 2130 | #ifdef PNG_FLOATING_POINT_SUPPORTED
|
|---|
| 2131 | extern PNG_EXPORT(png_uint_32,png_get_gAMA) PNGARG((png_structp png_ptr,
|
|---|
| 2132 | png_infop info_ptr, double *file_gamma));
|
|---|
| 2133 | #endif
|
|---|
| 2134 | extern PNG_EXPORT(png_uint_32,png_get_gAMA_fixed) PNGARG((png_structp png_ptr,
|
|---|
| 2135 | png_infop info_ptr, png_fixed_point *int_file_gamma));
|
|---|
| 2136 | #endif
|
|---|
| 2137 |
|
|---|
| 2138 | #ifdef PNG_gAMA_SUPPORTED
|
|---|
| 2139 | #ifdef PNG_FLOATING_POINT_SUPPORTED
|
|---|
| 2140 | extern PNG_EXPORT(void,png_set_gAMA) PNGARG((png_structp png_ptr,
|
|---|
| 2141 | png_infop info_ptr, double file_gamma));
|
|---|
| 2142 | #endif
|
|---|
| 2143 | extern PNG_EXPORT(void,png_set_gAMA_fixed) PNGARG((png_structp png_ptr,
|
|---|
| 2144 | png_infop info_ptr, png_fixed_point int_file_gamma));
|
|---|
| 2145 | #endif
|
|---|
| 2146 |
|
|---|
| 2147 | #ifdef PNG_hIST_SUPPORTED
|
|---|
| 2148 | extern PNG_EXPORT(png_uint_32,png_get_hIST) PNGARG((png_structp png_ptr,
|
|---|
| 2149 | png_infop info_ptr, png_uint_16p *hist));
|
|---|
| 2150 | #endif
|
|---|
| 2151 |
|
|---|
| 2152 | #ifdef PNG_hIST_SUPPORTED
|
|---|
| 2153 | extern PNG_EXPORT(void,png_set_hIST) PNGARG((png_structp png_ptr,
|
|---|
| 2154 | png_infop info_ptr, png_uint_16p hist));
|
|---|
| 2155 | #endif
|
|---|
| 2156 |
|
|---|
| 2157 | extern PNG_EXPORT(png_uint_32,png_get_IHDR) PNGARG((png_structp png_ptr,
|
|---|
| 2158 | png_infop info_ptr, png_uint_32 *width, png_uint_32 *height,
|
|---|
| 2159 | int *bit_depth, int *color_type, int *interlace_method,
|
|---|
| 2160 | int *compression_method, int *filter_method));
|
|---|
| 2161 |
|
|---|
| 2162 | extern PNG_EXPORT(void,png_set_IHDR) PNGARG((png_structp png_ptr,
|
|---|
| 2163 | png_infop info_ptr, png_uint_32 width, png_uint_32 height, int bit_depth,
|
|---|
| 2164 | int color_type, int interlace_method, int compression_method,
|
|---|
| 2165 | int filter_method));
|
|---|
| 2166 |
|
|---|
| 2167 | #ifdef PNG_oFFs_SUPPORTED
|
|---|
| 2168 | extern PNG_EXPORT(png_uint_32,png_get_oFFs) PNGARG((png_structp png_ptr,
|
|---|
| 2169 | png_infop info_ptr, png_int_32 *offset_x, png_int_32 *offset_y,
|
|---|
| 2170 | int *unit_type));
|
|---|
| 2171 | #endif
|
|---|
| 2172 |
|
|---|
| 2173 | #ifdef PNG_oFFs_SUPPORTED
|
|---|
| 2174 | extern PNG_EXPORT(void,png_set_oFFs) PNGARG((png_structp png_ptr,
|
|---|
| 2175 | png_infop info_ptr, png_int_32 offset_x, png_int_32 offset_y,
|
|---|
| 2176 | int unit_type));
|
|---|
| 2177 | #endif
|
|---|
| 2178 |
|
|---|
| 2179 | #ifdef PNG_pCAL_SUPPORTED
|
|---|
| 2180 | extern PNG_EXPORT(png_uint_32,png_get_pCAL) PNGARG((png_structp png_ptr,
|
|---|
| 2181 | png_infop info_ptr, png_charp *purpose, png_int_32 *X0, png_int_32 *X1,
|
|---|
| 2182 | int *type, int *nparams, png_charp *units, png_charpp *params));
|
|---|
| 2183 | #endif
|
|---|
| 2184 |
|
|---|
| 2185 | #ifdef PNG_pCAL_SUPPORTED
|
|---|
| 2186 | extern PNG_EXPORT(void,png_set_pCAL) PNGARG((png_structp png_ptr,
|
|---|
| 2187 | png_infop info_ptr, png_charp purpose, png_int_32 X0, png_int_32 X1,
|
|---|
| 2188 | int type, int nparams, png_charp units, png_charpp params));
|
|---|
| 2189 | #endif
|
|---|
| 2190 |
|
|---|
| 2191 | #ifdef PNG_pHYs_SUPPORTED
|
|---|
| 2192 | extern PNG_EXPORT(png_uint_32,png_get_pHYs) PNGARG((png_structp png_ptr,
|
|---|
| 2193 | png_infop info_ptr, png_uint_32 *res_x, png_uint_32 *res_y, int *unit_type));
|
|---|
| 2194 | #endif
|
|---|
| 2195 |
|
|---|
| 2196 | #ifdef PNG_pHYs_SUPPORTED
|
|---|
| 2197 | extern PNG_EXPORT(void,png_set_pHYs) PNGARG((png_structp png_ptr,
|
|---|
| 2198 | png_infop info_ptr, png_uint_32 res_x, png_uint_32 res_y, int unit_type));
|
|---|
| 2199 | #endif
|
|---|
| 2200 |
|
|---|
| 2201 | extern PNG_EXPORT(png_uint_32,png_get_PLTE) PNGARG((png_structp png_ptr,
|
|---|
| 2202 | png_infop info_ptr, png_colorp *palette, int *num_palette));
|
|---|
| 2203 |
|
|---|
| 2204 | extern PNG_EXPORT(void,png_set_PLTE) PNGARG((png_structp png_ptr,
|
|---|
| 2205 | png_infop info_ptr, png_colorp palette, int num_palette));
|
|---|
| 2206 |
|
|---|
| 2207 | #ifdef PNG_sBIT_SUPPORTED
|
|---|
| 2208 | extern PNG_EXPORT(png_uint_32,png_get_sBIT) PNGARG((png_structp png_ptr,
|
|---|
| 2209 | png_infop info_ptr, png_color_8p *sig_bit));
|
|---|
| 2210 | #endif
|
|---|
| 2211 |
|
|---|
| 2212 | #ifdef PNG_sBIT_SUPPORTED
|
|---|
| 2213 | extern PNG_EXPORT(void,png_set_sBIT) PNGARG((png_structp png_ptr,
|
|---|
| 2214 | png_infop info_ptr, png_color_8p sig_bit));
|
|---|
| 2215 | #endif
|
|---|
| 2216 |
|
|---|
| 2217 | #ifdef PNG_sRGB_SUPPORTED
|
|---|
| 2218 | extern PNG_EXPORT(png_uint_32,png_get_sRGB) PNGARG((png_structp png_ptr,
|
|---|
| 2219 | png_infop info_ptr, int *intent));
|
|---|
| 2220 | #endif
|
|---|
| 2221 |
|
|---|
| 2222 | #ifdef PNG_sRGB_SUPPORTED
|
|---|
| 2223 | extern PNG_EXPORT(void,png_set_sRGB) PNGARG((png_structp png_ptr,
|
|---|
| 2224 | png_infop info_ptr, int intent));
|
|---|
| 2225 | extern PNG_EXPORT(void,png_set_sRGB_gAMA_and_cHRM) PNGARG((png_structp png_ptr,
|
|---|
| 2226 | png_infop info_ptr, int intent));
|
|---|
| 2227 | #endif
|
|---|
| 2228 |
|
|---|
| 2229 | #ifdef PNG_iCCP_SUPPORTED
|
|---|
| 2230 | extern PNG_EXPORT(png_uint_32,png_get_iCCP) PNGARG((png_structp png_ptr,
|
|---|
| 2231 | png_infop info_ptr, png_charpp name, int *compression_type,
|
|---|
| 2232 | png_charpp profile, png_uint_32 *proflen));
|
|---|
| 2233 | /* Note to maintainer: profile should be png_bytepp */
|
|---|
| 2234 | #endif
|
|---|
| 2235 |
|
|---|
| 2236 | #ifdef PNG_iCCP_SUPPORTED
|
|---|
| 2237 | extern PNG_EXPORT(void,png_set_iCCP) PNGARG((png_structp png_ptr,
|
|---|
| 2238 | png_infop info_ptr, png_charp name, int compression_type,
|
|---|
| 2239 | png_charp profile, png_uint_32 proflen));
|
|---|
| 2240 | /* Note to maintainer: profile should be png_bytep */
|
|---|
| 2241 | #endif
|
|---|
| 2242 |
|
|---|
| 2243 | #ifdef PNG_sPLT_SUPPORTED
|
|---|
| 2244 | extern PNG_EXPORT(png_uint_32,png_get_sPLT) PNGARG((png_structp png_ptr,
|
|---|
| 2245 | png_infop info_ptr, png_sPLT_tpp entries));
|
|---|
| 2246 | #endif
|
|---|
| 2247 |
|
|---|
| 2248 | #ifdef PNG_sPLT_SUPPORTED
|
|---|
| 2249 | extern PNG_EXPORT(void,png_set_sPLT) PNGARG((png_structp png_ptr,
|
|---|
| 2250 | png_infop info_ptr, png_sPLT_tp entries, int nentries));
|
|---|
| 2251 | #endif
|
|---|
| 2252 |
|
|---|
| 2253 | #ifdef PNG_TEXT_SUPPORTED
|
|---|
| 2254 | /* png_get_text also returns the number of text chunks in *num_text */
|
|---|
| 2255 | extern PNG_EXPORT(png_uint_32,png_get_text) PNGARG((png_structp png_ptr,
|
|---|
| 2256 | png_infop info_ptr, png_textp *text_ptr, int *num_text));
|
|---|
| 2257 | #endif
|
|---|
| 2258 |
|
|---|
| 2259 | /* Note while png_set_text() will accept a structure whose text,
|
|---|
| 2260 | * language, and translated keywords are NULL pointers, the structure
|
|---|
| 2261 | * returned by png_get_text will always contain regular
|
|---|
| 2262 | * zero-terminated C strings. They might be empty strings but
|
|---|
| 2263 | * they will never be NULL pointers.
|
|---|
| 2264 | */
|
|---|
| 2265 |
|
|---|
| 2266 | #ifdef PNG_TEXT_SUPPORTED
|
|---|
| 2267 | extern PNG_EXPORT(void,png_set_text) PNGARG((png_structp png_ptr,
|
|---|
| 2268 | png_infop info_ptr, png_textp text_ptr, int num_text));
|
|---|
| 2269 | #endif
|
|---|
| 2270 |
|
|---|
| 2271 | #ifdef PNG_tIME_SUPPORTED
|
|---|
| 2272 | extern PNG_EXPORT(png_uint_32,png_get_tIME) PNGARG((png_structp png_ptr,
|
|---|
| 2273 | png_infop info_ptr, png_timep *mod_time));
|
|---|
| 2274 | #endif
|
|---|
| 2275 |
|
|---|
| 2276 | #ifdef PNG_tIME_SUPPORTED
|
|---|
| 2277 | extern PNG_EXPORT(void,png_set_tIME) PNGARG((png_structp png_ptr,
|
|---|
| 2278 | png_infop info_ptr, png_timep mod_time));
|
|---|
| 2279 | #endif
|
|---|
| 2280 |
|
|---|
| 2281 | #ifdef PNG_tRNS_SUPPORTED
|
|---|
| 2282 | extern PNG_EXPORT(png_uint_32,png_get_tRNS) PNGARG((png_structp png_ptr,
|
|---|
| 2283 | png_infop info_ptr, png_bytep *trans_alpha, int *num_trans,
|
|---|
| 2284 | png_color_16p *trans_color));
|
|---|
| 2285 | #endif
|
|---|
| 2286 |
|
|---|
| 2287 | #ifdef PNG_tRNS_SUPPORTED
|
|---|
| 2288 | extern PNG_EXPORT(void,png_set_tRNS) PNGARG((png_structp png_ptr,
|
|---|
| 2289 | png_infop info_ptr, png_bytep trans_alpha, int num_trans,
|
|---|
| 2290 | png_color_16p trans_color));
|
|---|
| 2291 | #endif
|
|---|
| 2292 |
|
|---|
| 2293 | #ifdef PNG_tRNS_SUPPORTED
|
|---|
| 2294 | #endif
|
|---|
| 2295 |
|
|---|
| 2296 | #ifdef PNG_sCAL_SUPPORTED
|
|---|
| 2297 | #ifdef PNG_FLOATING_POINT_SUPPORTED
|
|---|
| 2298 | extern PNG_EXPORT(png_uint_32,png_get_sCAL) PNGARG((png_structp png_ptr,
|
|---|
| 2299 | png_infop info_ptr, int *unit, double *width, double *height));
|
|---|
| 2300 | #else
|
|---|
| 2301 | #ifdef PNG_FIXED_POINT_SUPPORTED
|
|---|
| 2302 | extern PNG_EXPORT(png_uint_32,png_get_sCAL_s) PNGARG((png_structp png_ptr,
|
|---|
| 2303 | png_infop info_ptr, int *unit, png_charpp swidth, png_charpp sheight));
|
|---|
| 2304 | #endif
|
|---|
| 2305 | #endif
|
|---|
| 2306 | #endif /* PNG_sCAL_SUPPORTED */
|
|---|
| 2307 |
|
|---|
| 2308 | #ifdef PNG_sCAL_SUPPORTED
|
|---|
| 2309 | #ifdef PNG_FLOATING_POINT_SUPPORTED
|
|---|
| 2310 | extern PNG_EXPORT(void,png_set_sCAL) PNGARG((png_structp png_ptr,
|
|---|
| 2311 | png_infop info_ptr, int unit, double width, double height));
|
|---|
| 2312 | #else
|
|---|
| 2313 | #ifdef PNG_FIXED_POINT_SUPPORTED
|
|---|
| 2314 | extern PNG_EXPORT(void,png_set_sCAL_s) PNGARG((png_structp png_ptr,
|
|---|
| 2315 | png_infop info_ptr, int unit, png_charp swidth, png_charp sheight));
|
|---|
| 2316 | #endif
|
|---|
| 2317 | #endif
|
|---|
| 2318 | #endif /* PNG_sCAL_SUPPORTED || PNG_WRITE_sCAL_SUPPORTED */
|
|---|
| 2319 |
|
|---|
| 2320 | #ifdef PNG_HANDLE_AS_UNKNOWN_SUPPORTED
|
|---|
| 2321 | /* Provide a list of chunks and how they are to be handled, if the built-in
|
|---|
| 2322 | handling or default unknown chunk handling is not desired. Any chunks not
|
|---|
| 2323 | listed will be handled in the default manner. The IHDR and IEND chunks
|
|---|
| 2324 | must not be listed.
|
|---|
| 2325 | keep = 0: follow default behaviour
|
|---|
| 2326 | = 1: do not keep
|
|---|
| 2327 | = 2: keep only if safe-to-copy
|
|---|
| 2328 | = 3: keep even if unsafe-to-copy
|
|---|
| 2329 | */
|
|---|
| 2330 | extern PNG_EXPORT(void, png_set_keep_unknown_chunks) PNGARG((png_structp
|
|---|
| 2331 | png_ptr, int keep, png_bytep chunk_list, int num_chunks));
|
|---|
| 2332 | PNG_EXPORT(int,png_handle_as_unknown) PNGARG((png_structp png_ptr, png_bytep
|
|---|
| 2333 | chunk_name));
|
|---|
| 2334 | #endif
|
|---|
| 2335 | #ifdef PNG_UNKNOWN_CHUNKS_SUPPORTED
|
|---|
| 2336 | extern PNG_EXPORT(void, png_set_unknown_chunks) PNGARG((png_structp png_ptr,
|
|---|
| 2337 | png_infop info_ptr, png_unknown_chunkp unknowns, int num_unknowns));
|
|---|
| 2338 | extern PNG_EXPORT(void, png_set_unknown_chunk_location)
|
|---|
| 2339 | PNGARG((png_structp png_ptr, png_infop info_ptr, int chunk, int location));
|
|---|
| 2340 | extern PNG_EXPORT(png_uint_32,png_get_unknown_chunks) PNGARG((png_structp
|
|---|
| 2341 | png_ptr, png_infop info_ptr, png_unknown_chunkpp entries));
|
|---|
| 2342 | #endif
|
|---|
| 2343 |
|
|---|
| 2344 | /* Png_free_data() will turn off the "valid" flag for anything it frees.
|
|---|
| 2345 | * If you need to turn it off for a chunk that your application has freed,
|
|---|
| 2346 | * you can use png_set_invalid(png_ptr, info_ptr, PNG_INFO_CHNK);
|
|---|
| 2347 | */
|
|---|
| 2348 | extern PNG_EXPORT(void, png_set_invalid) PNGARG((png_structp png_ptr,
|
|---|
| 2349 | png_infop info_ptr, int mask));
|
|---|
| 2350 |
|
|---|
| 2351 | #ifdef PNG_INFO_IMAGE_SUPPORTED
|
|---|
| 2352 | /* The "params" pointer is currently not used and is for future expansion. */
|
|---|
| 2353 | extern PNG_EXPORT(void, png_read_png) PNGARG((png_structp png_ptr,
|
|---|
| 2354 | png_infop info_ptr,
|
|---|
| 2355 | int transforms,
|
|---|
| 2356 | png_voidp params));
|
|---|
| 2357 | extern PNG_EXPORT(void, png_write_png) PNGARG((png_structp png_ptr,
|
|---|
| 2358 | png_infop info_ptr,
|
|---|
| 2359 | int transforms,
|
|---|
| 2360 | png_voidp params));
|
|---|
| 2361 | #endif
|
|---|
| 2362 |
|
|---|
| 2363 | extern PNG_EXPORT(png_charp,png_get_copyright) PNGARG((png_structp png_ptr));
|
|---|
| 2364 | extern PNG_EXPORT(png_charp,png_get_header_ver) PNGARG((png_structp png_ptr));
|
|---|
| 2365 | extern PNG_EXPORT(png_charp,png_get_header_version) PNGARG((png_structp png_ptr));
|
|---|
| 2366 | extern PNG_EXPORT(png_charp,png_get_libpng_ver) PNGARG((png_structp png_ptr));
|
|---|
| 2367 |
|
|---|
| 2368 | #ifdef PNG_MNG_FEATURES_SUPPORTED
|
|---|
| 2369 | extern PNG_EXPORT(png_uint_32,png_permit_mng_features) PNGARG((png_structp
|
|---|
| 2370 | png_ptr, png_uint_32 mng_features_permitted));
|
|---|
| 2371 | #endif
|
|---|
| 2372 |
|
|---|
| 2373 | /* For use in png_set_keep_unknown, added to version 1.2.6 */
|
|---|
| 2374 | #define PNG_HANDLE_CHUNK_AS_DEFAULT 0
|
|---|
| 2375 | #define PNG_HANDLE_CHUNK_NEVER 1
|
|---|
| 2376 | #define PNG_HANDLE_CHUNK_IF_SAFE 2
|
|---|
| 2377 | #define PNG_HANDLE_CHUNK_ALWAYS 3
|
|---|
| 2378 |
|
|---|
| 2379 | /* Strip the prepended error numbers ("#nnn ") from error and warning
|
|---|
| 2380 | * messages before passing them to the error or warning handler.
|
|---|
| 2381 | */
|
|---|
| 2382 | #ifdef PNG_ERROR_NUMBERS_SUPPORTED
|
|---|
| 2383 | extern PNG_EXPORT(void,png_set_strip_error_numbers) PNGARG((png_structp
|
|---|
| 2384 | png_ptr, png_uint_32 strip_mode));
|
|---|
| 2385 | #endif
|
|---|
| 2386 |
|
|---|
| 2387 | /* Added in libpng-1.2.6 */
|
|---|
| 2388 | #ifdef PNG_SET_USER_LIMITS_SUPPORTED
|
|---|
| 2389 | extern PNG_EXPORT(void,png_set_user_limits) PNGARG((png_structp
|
|---|
| 2390 | png_ptr, png_uint_32 user_width_max, png_uint_32 user_height_max));
|
|---|
| 2391 | extern PNG_EXPORT(png_uint_32,png_get_user_width_max) PNGARG((png_structp
|
|---|
| 2392 | png_ptr));
|
|---|
| 2393 | extern PNG_EXPORT(png_uint_32,png_get_user_height_max) PNGARG((png_structp
|
|---|
| 2394 | png_ptr));
|
|---|
| 2395 | /* Added in libpng-1.4.0 */
|
|---|
| 2396 | extern PNG_EXPORT(void,png_set_chunk_cache_max) PNGARG((png_structp
|
|---|
| 2397 | png_ptr, png_uint_32 user_chunk_cache_max));
|
|---|
| 2398 | extern PNG_EXPORT(png_uint_32,png_get_chunk_cache_max)
|
|---|
| 2399 | PNGARG((png_structp png_ptr));
|
|---|
| 2400 | #endif
|
|---|
| 2401 |
|
|---|
| 2402 | #if defined(PNG_INCH_CONVERSIONS) && defined(PNG_FLOATING_POINT_SUPPORTED)
|
|---|
| 2403 | PNG_EXPORT(png_uint_32,png_get_pixels_per_inch) PNGARG((png_structp png_ptr,
|
|---|
| 2404 | png_infop info_ptr));
|
|---|
| 2405 |
|
|---|
| 2406 | PNG_EXPORT(png_uint_32,png_get_x_pixels_per_inch) PNGARG((png_structp png_ptr,
|
|---|
| 2407 | png_infop info_ptr));
|
|---|
| 2408 |
|
|---|
| 2409 | PNG_EXPORT(png_uint_32,png_get_y_pixels_per_inch) PNGARG((png_structp png_ptr,
|
|---|
| 2410 | png_infop info_ptr));
|
|---|
| 2411 |
|
|---|
| 2412 | PNG_EXPORT(float,png_get_x_offset_inches) PNGARG((png_structp png_ptr,
|
|---|
| 2413 | png_infop info_ptr));
|
|---|
| 2414 |
|
|---|
| 2415 | PNG_EXPORT(float,png_get_y_offset_inches) PNGARG((png_structp png_ptr,
|
|---|
| 2416 | png_infop info_ptr));
|
|---|
| 2417 |
|
|---|
| 2418 | #ifdef PNG_pHYs_SUPPORTED
|
|---|
| 2419 | PNG_EXPORT(png_uint_32,png_get_pHYs_dpi) PNGARG((png_structp png_ptr,
|
|---|
| 2420 | png_infop info_ptr, png_uint_32 *res_x, png_uint_32 *res_y, int *unit_type));
|
|---|
| 2421 | #endif /* PNG_pHYs_SUPPORTED */
|
|---|
| 2422 | #endif /* PNG_INCH_CONVERSIONS && PNG_FLOATING_POINT_SUPPORTED */
|
|---|
| 2423 |
|
|---|
| 2424 | /* Added in libpng-1.4.0 */
|
|---|
| 2425 | #ifdef PNG_IO_STATE_SUPPORTED
|
|---|
| 2426 | extern PNG_EXPORT(png_uint_32,png_get_io_state) PNGARG((png_structp png_ptr));
|
|---|
| 2427 |
|
|---|
| 2428 | extern PNG_EXPORT(png_bytep,png_get_io_chunk_name)
|
|---|
| 2429 | PNGARG((png_structp png_ptr));
|
|---|
| 2430 |
|
|---|
| 2431 | /* The flags returned by png_get_io_state() are the following: */
|
|---|
| 2432 | #define PNG_IO_NONE 0x0000 /* no I/O at this moment */
|
|---|
| 2433 | #define PNG_IO_READING 0x0001 /* currently reading */
|
|---|
| 2434 | #define PNG_IO_WRITING 0x0002 /* currently writing */
|
|---|
| 2435 | #define PNG_IO_SIGNATURE 0x0010 /* currently at the file signature */
|
|---|
| 2436 | #define PNG_IO_CHUNK_HDR 0x0020 /* currently at the chunk header */
|
|---|
| 2437 | #define PNG_IO_CHUNK_DATA 0x0040 /* currently at the chunk data */
|
|---|
| 2438 | #define PNG_IO_CHUNK_CRC 0x0080 /* currently at the chunk crc */
|
|---|
| 2439 | #define PNG_IO_MASK_OP 0x000f /* current operation: reading/writing */
|
|---|
| 2440 | #define PNG_IO_MASK_LOC 0x00f0 /* current location: sig/hdr/data/crc */
|
|---|
| 2441 | #endif /* ?PNG_IO_STATE_SUPPORTED */
|
|---|
| 2442 |
|
|---|
| 2443 | /* Maintainer: Put new public prototypes here ^, in libpng.3, and project
|
|---|
| 2444 | * defs
|
|---|
| 2445 | */
|
|---|
| 2446 |
|
|---|
| 2447 | #ifdef PNG_READ_COMPOSITE_NODIV_SUPPORTED
|
|---|
| 2448 | /* With these routines we avoid an integer divide, which will be slower on
|
|---|
| 2449 | * most machines. However, it does take more operations than the corresponding
|
|---|
| 2450 | * divide method, so it may be slower on a few RISC systems. There are two
|
|---|
| 2451 | * shifts (by 8 or 16 bits) and an addition, versus a single integer divide.
|
|---|
| 2452 | *
|
|---|
| 2453 | * Note that the rounding factors are NOT supposed to be the same! 128 and
|
|---|
| 2454 | * 32768 are correct for the NODIV code; 127 and 32767 are correct for the
|
|---|
| 2455 | * standard method.
|
|---|
| 2456 | *
|
|---|
| 2457 | * [Optimized code by Greg Roelofs and Mark Adler...blame us for bugs. :-) ]
|
|---|
| 2458 | */
|
|---|
| 2459 |
|
|---|
| 2460 | /* fg and bg should be in `gamma 1.0' space; alpha is the opacity */
|
|---|
| 2461 |
|
|---|
| 2462 | # define png_composite(composite, fg, alpha, bg) \
|
|---|
| 2463 | { png_uint_16 temp = (png_uint_16)((png_uint_16)(fg) * (png_uint_16)(alpha) \
|
|---|
| 2464 | + (png_uint_16)(bg)*(png_uint_16)(255 - \
|
|---|
| 2465 | (png_uint_16)(alpha)) + (png_uint_16)128); \
|
|---|
| 2466 | (composite) = (png_byte)((temp + (temp >> 8)) >> 8); }
|
|---|
| 2467 |
|
|---|
| 2468 | # define png_composite_16(composite, fg, alpha, bg) \
|
|---|
| 2469 | { png_uint_32 temp = (png_uint_32)((png_uint_32)(fg) * (png_uint_32)(alpha) \
|
|---|
| 2470 | + (png_uint_32)(bg)*(png_uint_32)(65535L - \
|
|---|
| 2471 | (png_uint_32)(alpha)) + (png_uint_32)32768L); \
|
|---|
| 2472 | (composite) = (png_uint_16)((temp + (temp >> 16)) >> 16); }
|
|---|
| 2473 |
|
|---|
| 2474 | #else /* Standard method using integer division */
|
|---|
| 2475 |
|
|---|
| 2476 | # define png_composite(composite, fg, alpha, bg) \
|
|---|
| 2477 | (composite) = (png_byte)(((png_uint_16)(fg) * (png_uint_16)(alpha) + \
|
|---|
| 2478 | (png_uint_16)(bg) * (png_uint_16)(255 - (png_uint_16)(alpha)) + \
|
|---|
| 2479 | (png_uint_16)127) / 255)
|
|---|
| 2480 |
|
|---|
| 2481 | # define png_composite_16(composite, fg, alpha, bg) \
|
|---|
| 2482 | (composite) = (png_uint_16)(((png_uint_32)(fg) * (png_uint_32)(alpha) + \
|
|---|
| 2483 | (png_uint_32)(bg)*(png_uint_32)(65535L - (png_uint_32)(alpha)) + \
|
|---|
| 2484 | (png_uint_32)32767) / (png_uint_32)65535L)
|
|---|
| 2485 | #endif /* PNG_READ_COMPOSITE_NODIV_SUPPORTED */
|
|---|
| 2486 |
|
|---|
| 2487 | #ifdef PNG_USE_READ_MACROS
|
|---|
| 2488 | /* Inline macros to do direct reads of bytes from the input buffer.
|
|---|
| 2489 | * The png_get_int_32() routine assumes we are using two's complement
|
|---|
| 2490 | * format for negative values, which is almost certainly true.
|
|---|
| 2491 | */
|
|---|
| 2492 | /* We could make special-case BIG_ENDIAN macros that do direct reads here */
|
|---|
| 2493 | # define png_get_uint_32(buf) \
|
|---|
| 2494 | (((png_uint_32)(*(buf)) << 24) + \
|
|---|
| 2495 | ((png_uint_32)(*((buf) + 1)) << 16) + \
|
|---|
| 2496 | ((png_uint_32)(*((buf) + 2)) << 8) + \
|
|---|
| 2497 | ((png_uint_32)(*((buf) + 3))))
|
|---|
| 2498 | # define png_get_uint_16(buf) \
|
|---|
| 2499 | (((png_uint_32)(*(buf)) << 8) + \
|
|---|
| 2500 | ((png_uint_32)(*((buf) + 1))))
|
|---|
| 2501 | #ifdef PNG_GET_INT_32_SUPPORTED
|
|---|
| 2502 | # define png_get_int_32(buf) \
|
|---|
| 2503 | (((png_int_32)(*(buf)) << 24) + \
|
|---|
| 2504 | ((png_int_32)(*((buf) + 1)) << 16) + \
|
|---|
| 2505 | ((png_int_32)(*((buf) + 2)) << 8) + \
|
|---|
| 2506 | ((png_int_32)(*((buf) + 3))))
|
|---|
| 2507 | #endif
|
|---|
| 2508 | #else
|
|---|
| 2509 | extern PNG_EXPORT(png_uint_32,png_get_uint_32) PNGARG((png_bytep buf));
|
|---|
| 2510 | extern PNG_EXPORT(png_uint_16,png_get_uint_16) PNGARG((png_bytep buf));
|
|---|
| 2511 | #ifdef PNG_GET_INT_32_SUPPORTED
|
|---|
| 2512 | extern PNG_EXPORT(png_int_32,png_get_int_32) PNGARG((png_bytep buf));
|
|---|
| 2513 | #endif
|
|---|
| 2514 | #endif
|
|---|
| 2515 | extern PNG_EXPORT(png_uint_32,png_get_uint_31)
|
|---|
| 2516 | PNGARG((png_structp png_ptr, png_bytep buf));
|
|---|
| 2517 | /* No png_get_int_16 -- may be added if there's a real need for it. */
|
|---|
| 2518 |
|
|---|
| 2519 | /* Place a 32-bit number into a buffer in PNG byte order (big-endian). */
|
|---|
| 2520 | extern PNG_EXPORT(void,png_save_uint_32)
|
|---|
| 2521 | PNGARG((png_bytep buf, png_uint_32 i));
|
|---|
| 2522 | extern PNG_EXPORT(void,png_save_int_32)
|
|---|
| 2523 | PNGARG((png_bytep buf, png_int_32 i));
|
|---|
| 2524 |
|
|---|
| 2525 | /* Place a 16-bit number into a buffer in PNG byte order.
|
|---|
| 2526 | * The parameter is declared unsigned int, not png_uint_16,
|
|---|
| 2527 | * just to avoid potential problems on pre-ANSI C compilers.
|
|---|
| 2528 | */
|
|---|
| 2529 | extern PNG_EXPORT(void,png_save_uint_16)
|
|---|
| 2530 | PNGARG((png_bytep buf, unsigned int i));
|
|---|
| 2531 | /* No png_save_int_16 -- may be added if there's a real need for it. */
|
|---|
| 2532 |
|
|---|
| 2533 | /* ************************************************************************* */
|
|---|
| 2534 |
|
|---|
| 2535 | /* Various modes of operation. Note that after an init, mode is set to
|
|---|
| 2536 | * zero automatically when the structure is created.
|
|---|
| 2537 | */
|
|---|
| 2538 | #define PNG_HAVE_IHDR 0x01
|
|---|
| 2539 | #define PNG_HAVE_PLTE 0x02
|
|---|
| 2540 | #define PNG_HAVE_IDAT 0x04
|
|---|
| 2541 | #define PNG_AFTER_IDAT 0x08 /* Have complete zlib datastream */
|
|---|
| 2542 | #define PNG_HAVE_IEND 0x10
|
|---|
| 2543 | #define PNG_HAVE_gAMA 0x20
|
|---|
| 2544 | #define PNG_HAVE_cHRM 0x40
|
|---|
| 2545 |
|
|---|
| 2546 | #ifdef __cplusplus
|
|---|
| 2547 | }
|
|---|
| 2548 | #endif
|
|---|
| 2549 |
|
|---|
| 2550 | #endif /* PNG_VERSION_INFO_ONLY */
|
|---|
| 2551 | /* Do not put anything past this line */
|
|---|
| 2552 | #endif /* PNG_H */
|
|---|
