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/* png.h - header file for PNG reference library
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*
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* libpng version 1.2.40 - September 10, 2009
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* Copyright (c) 1998-2009 Glenn Randers-Pehrson
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* (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger)
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* (Version 0.88 Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.)
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*
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* This code is released under the libpng license (See LICENSE, below)
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*
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* Authors and maintainers:
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* libpng versions 0.71, May 1995, through 0.88, January 1996: Guy Schalnat
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* libpng versions 0.89c, June 1996, through 0.96, May 1997: Andreas Dilger
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* libpng versions 0.97, January 1998, through 1.2.40 - September 10, 2009: Glenn
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* See also "Contributing Authors", below.
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*
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* Note about libpng version numbers:
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*
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* Due to various miscommunications, unforeseen code incompatibilities
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* and occasional factors outside the authors' control, version numbering
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* on the library has not always been consistent and straightforward.
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* The following table summarizes matters since version 0.89c, which was
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* the first widely used release:
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*
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* source png.h png.h shared-lib
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* version string int version
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* ------- ------ ----- ----------
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* 0.89c "1.0 beta 3" 0.89 89 1.0.89
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* 0.90 "1.0 beta 4" 0.90 90 0.90 [should have been 2.0.90]
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* 0.95 "1.0 beta 5" 0.95 95 0.95 [should have been 2.0.95]
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* 0.96 "1.0 beta 6" 0.96 96 0.96 [should have been 2.0.96]
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* 0.97b "1.00.97 beta 7" 1.00.97 97 1.0.1 [should have been 2.0.97]
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* 0.97c 0.97 97 2.0.97
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* 0.98 0.98 98 2.0.98
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* 0.99 0.99 98 2.0.99
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* 0.99a-m 0.99 99 2.0.99
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* 1.00 1.00 100 2.1.0 [100 should be 10000]
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* 1.0.0 (from here on, the 100 2.1.0 [100 should be 10000]
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* 1.0.1 png.h string is 10001 2.1.0
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* 1.0.1a-e identical to the 10002 from here on, the shared library
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* 1.0.2 source version) 10002 is 2.V where V is the source code
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* 1.0.2a-b 10003 version, except as noted.
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* 1.0.3 10003
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* 1.0.3a-d 10004
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* 1.0.4 10004
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* 1.0.4a-f 10005
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* 1.0.5 (+ 2 patches) 10005
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* 1.0.5a-d 10006
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* 1.0.5e-r 10100 (not source compatible)
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* 1.0.5s-v 10006 (not binary compatible)
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* 1.0.6 (+ 3 patches) 10006 (still binary incompatible)
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* 1.0.6d-f 10007 (still binary incompatible)
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* 1.0.6g 10007
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* 1.0.6h 10007 10.6h (testing xy.z so-numbering)
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* 1.0.6i 10007 10.6i
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* 1.0.6j 10007 2.1.0.6j (incompatible with 1.0.0)
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* 1.0.7beta11-14 DLLNUM 10007 2.1.0.7beta11-14 (binary compatible)
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* 1.0.7beta15-18 1 10007 2.1.0.7beta15-18 (binary compatible)
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* 1.0.7rc1-2 1 10007 2.1.0.7rc1-2 (binary compatible)
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* 1.0.7 1 10007 (still compatible)
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* 1.0.8beta1-4 1 10008 2.1.0.8beta1-4
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* 1.0.8rc1 1 10008 2.1.0.8rc1
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* 1.0.8 1 10008 2.1.0.8
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* 1.0.9beta1-6 1 10009 2.1.0.9beta1-6
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* 1.0.9rc1 1 10009 2.1.0.9rc1
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* 1.0.9beta7-10 1 10009 2.1.0.9beta7-10
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* 1.0.9rc2 1 10009 2.1.0.9rc2
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* 1.0.9 1 10009 2.1.0.9
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* 1.0.10beta1 1 10010 2.1.0.10beta1
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* 1.0.10rc1 1 10010 2.1.0.10rc1
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* 1.0.10 1 10010 2.1.0.10
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* 1.0.11beta1-3 1 10011 2.1.0.11beta1-3
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* 1.0.11rc1 1 10011 2.1.0.11rc1
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* 1.0.11 1 10011 2.1.0.11
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* 1.0.12beta1-2 2 10012 2.1.0.12beta1-2
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* 1.0.12rc1 2 10012 2.1.0.12rc1
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* 1.0.12 2 10012 2.1.0.12
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* 1.1.0a-f - 10100 2.1.1.0a-f (branch abandoned)
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* 1.2.0beta1-2 2 10200 2.1.2.0beta1-2
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* 1.2.0beta3-5 3 10200 3.1.2.0beta3-5
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* 1.2.0rc1 3 10200 3.1.2.0rc1
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* 1.2.0 3 10200 3.1.2.0
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* 1.2.1beta1-4 3 10201 3.1.2.1beta1-4
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* 1.2.1rc1-2 3 10201 3.1.2.1rc1-2
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* 1.2.1 3 10201 3.1.2.1
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* 1.2.2beta1-6 12 10202 12.so.0.1.2.2beta1-6
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* 1.0.13beta1 10 10013 10.so.0.1.0.13beta1
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* 1.0.13rc1 10 10013 10.so.0.1.0.13rc1
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* 1.2.2rc1 12 10202 12.so.0.1.2.2rc1
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* 1.0.13 10 10013 10.so.0.1.0.13
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* 1.2.2 12 10202 12.so.0.1.2.2
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* 1.2.3rc1-6 12 10203 12.so.0.1.2.3rc1-6
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* 1.2.3 12 10203 12.so.0.1.2.3
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* 1.2.4beta1-3 13 10204 12.so.0.1.2.4beta1-3
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* 1.0.14rc1 13 10014 10.so.0.1.0.14rc1
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* 1.2.4rc1 13 10204 12.so.0.1.2.4rc1
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* 1.0.14 10 10014 10.so.0.1.0.14
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* 1.2.4 13 10204 12.so.0.1.2.4
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* 1.2.5beta1-2 13 10205 12.so.0.1.2.5beta1-2
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* 1.0.15rc1-3 10 10015 10.so.0.1.0.15rc1-3
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* 1.2.5rc1-3 13 10205 12.so.0.1.2.5rc1-3
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* 1.0.15 10 10015 10.so.0.1.0.15
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* 1.2.5 13 10205 12.so.0.1.2.5
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* 1.2.6beta1-4 13 10206 12.so.0.1.2.6beta1-4
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* 1.0.16 10 10016 10.so.0.1.0.16
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* 1.2.6 13 10206 12.so.0.1.2.6
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* 1.2.7beta1-2 13 10207 12.so.0.1.2.7beta1-2
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* 1.0.17rc1 10 10017 10.so.0.1.0.17rc1
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* 1.2.7rc1 13 10207 12.so.0.1.2.7rc1
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* 1.0.17 10 10017 10.so.0.1.0.17
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* 1.2.7 13 10207 12.so.0.1.2.7
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* 1.2.8beta1-5 13 10208 12.so.0.1.2.8beta1-5
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* 1.0.18rc1-5 10 10018 10.so.0.1.0.18rc1-5
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* 1.2.8rc1-5 13 10208 12.so.0.1.2.8rc1-5
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* 1.0.18 10 10018 10.so.0.1.0.18
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* 1.2.8 13 10208 12.so.0.1.2.8
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* 1.2.9beta1-3 13 10209 12.so.0.1.2.9beta1-3
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* 1.2.9beta4-11 13 10209 12.so.0.9[.0]
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* 1.2.9rc1 13 10209 12.so.0.9[.0]
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* 1.2.9 13 10209 12.so.0.9[.0]
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* 1.2.10beta1-8 13 10210 12.so.0.10[.0]
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* 1.2.10rc1-3 13 10210 12.so.0.10[.0]
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* 1.2.10 13 10210 12.so.0.10[.0]
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* 1.2.11beta1-4 13 10211 12.so.0.11[.0]
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* 1.0.19rc1-5 10 10019 10.so.0.19[.0]
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* 1.2.11rc1-5 13 10211 12.so.0.11[.0]
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* 1.0.19 10 10019 10.so.0.19[.0]
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* 1.2.11 13 10211 12.so.0.11[.0]
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* 1.0.20 10 10020 10.so.0.20[.0]
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* 1.2.12 13 10212 12.so.0.12[.0]
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* 1.2.13beta1 13 10213 12.so.0.13[.0]
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* 1.0.21 10 10021 10.so.0.21[.0]
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* 1.2.13 13 10213 12.so.0.13[.0]
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* 1.2.14beta1-2 13 10214 12.so.0.14[.0]
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* 1.0.22rc1 10 10022 10.so.0.22[.0]
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* 1.2.14rc1 13 10214 12.so.0.14[.0]
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* 1.0.22 10 10022 10.so.0.22[.0]
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* 1.2.14 13 10214 12.so.0.14[.0]
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138 |
* 1.2.15beta1-6 13 10215 12.so.0.15[.0]
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139 |
* 1.0.23rc1-5 10 10023 10.so.0.23[.0]
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140 |
* 1.2.15rc1-5 13 10215 12.so.0.15[.0]
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141 |
* 1.0.23 10 10023 10.so.0.23[.0]
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142 |
* 1.2.15 13 10215 12.so.0.15[.0]
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143 |
* 1.2.16beta1-2 13 10216 12.so.0.16[.0]
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144 |
* 1.2.16rc1 13 10216 12.so.0.16[.0]
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145 |
* 1.0.24 10 10024 10.so.0.24[.0]
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146 |
* 1.2.16 13 10216 12.so.0.16[.0]
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147 |
* 1.2.17beta1-2 13 10217 12.so.0.17[.0]
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148 |
* 1.0.25rc1 10 10025 10.so.0.25[.0]
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149 |
* 1.2.17rc1-3 13 10217 12.so.0.17[.0]
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150 |
* 1.0.25 10 10025 10.so.0.25[.0]
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151 |
* 1.2.17 13 10217 12.so.0.17[.0]
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152 |
* 1.0.26 10 10026 10.so.0.26[.0]
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153 |
* 1.2.18 13 10218 12.so.0.18[.0]
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154 |
* 1.2.19beta1-31 13 10219 12.so.0.19[.0]
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155 |
* 1.0.27rc1-6 10 10027 10.so.0.27[.0]
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156 |
* 1.2.19rc1-6 13 10219 12.so.0.19[.0]
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* 1.0.27 10 10027 10.so.0.27[.0]
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158 |
* 1.2.19 13 10219 12.so.0.19[.0]
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159 |
* 1.2.20beta01-04 13 10220 12.so.0.20[.0]
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160 |
* 1.0.28rc1-6 10 10028 10.so.0.28[.0]
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161 |
* 1.2.20rc1-6 13 10220 12.so.0.20[.0]
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162 |
* 1.0.28 10 10028 10.so.0.28[.0]
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163 |
* 1.2.20 13 10220 12.so.0.20[.0]
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164 |
* 1.2.21beta1-2 13 10221 12.so.0.21[.0]
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165 |
* 1.2.21rc1-3 13 10221 12.so.0.21[.0]
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166 |
* 1.0.29 10 10029 10.so.0.29[.0]
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167 |
* 1.2.21 13 10221 12.so.0.21[.0]
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168 |
* 1.2.22beta1-4 13 10222 12.so.0.22[.0]
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169 |
* 1.0.30rc1 10 10030 10.so.0.30[.0]
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170 |
* 1.2.22rc1 13 10222 12.so.0.22[.0]
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171 |
* 1.0.30 10 10030 10.so.0.30[.0]
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172 |
* 1.2.22 13 10222 12.so.0.22[.0]
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173 |
* 1.2.23beta01-05 13 10223 12.so.0.23[.0]
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174 |
* 1.2.23rc01 13 10223 12.so.0.23[.0]
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175 |
* 1.2.23 13 10223 12.so.0.23[.0]
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176 |
* 1.2.24beta01-02 13 10224 12.so.0.24[.0]
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177 |
* 1.2.24rc01 13 10224 12.so.0.24[.0]
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178 |
* 1.2.24 13 10224 12.so.0.24[.0]
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179 |
* 1.2.25beta01-06 13 10225 12.so.0.25[.0]
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180 |
* 1.2.25rc01-02 13 10225 12.so.0.25[.0]
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181 |
* 1.0.31 10 10031 10.so.0.31[.0]
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182 |
* 1.2.25 13 10225 12.so.0.25[.0]
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183 |
* 1.2.26beta01-06 13 10226 12.so.0.26[.0]
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184 |
* 1.2.26rc01 13 10226 12.so.0.26[.0]
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185 |
* 1.2.26 13 10226 12.so.0.26[.0]
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186 |
* 1.0.32 10 10032 10.so.0.32[.0]
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187 |
* 1.2.27beta01-06 13 10227 12.so.0.27[.0]
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|
188 |
* 1.2.27rc01 13 10227 12.so.0.27[.0]
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|
189 |
* 1.0.33 10 10033 10.so.0.33[.0]
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|
190 |
* 1.2.27 13 10227 12.so.0.27[.0]
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|
191 |
* 1.0.34 10 10034 10.so.0.34[.0]
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|
192 |
* 1.2.28 13 10228 12.so.0.28[.0]
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|
193 |
* 1.2.29beta01-03 13 10229 12.so.0.29[.0]
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|
194 |
* 1.2.29rc01 13 10229 12.so.0.29[.0]
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|
195 |
* 1.0.35 10 10035 10.so.0.35[.0]
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|
196 |
* 1.2.29 13 10229 12.so.0.29[.0]
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|
197 |
* 1.0.37 10 10037 10.so.0.37[.0]
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|
198 |
* 1.2.30beta01-04 13 10230 12.so.0.30[.0]
|
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|
199 |
* 1.0.38rc01-08 10 10038 10.so.0.38[.0]
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|
200 |
* 1.2.30rc01-08 13 10230 12.so.0.30[.0]
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|
201 |
* 1.0.38 10 10038 10.so.0.38[.0]
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202 |
* 1.2.30 13 10230 12.so.0.30[.0]
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|
203 |
* 1.0.39rc01-03 10 10039 10.so.0.39[.0]
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204 |
* 1.2.31rc01-03 13 10231 12.so.0.31[.0]
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|
205 |
* 1.0.39 10 10039 10.so.0.39[.0]
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|
206 |
* 1.2.31 13 10231 12.so.0.31[.0]
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|
207 |
* 1.2.32beta01-02 13 10232 12.so.0.32[.0]
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|
208 |
* 1.0.40rc01 10 10040 10.so.0.40[.0]
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|
209 |
* 1.2.32rc01 13 10232 12.so.0.32[.0]
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|
210 |
* 1.0.40 10 10040 10.so.0.40[.0]
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|
211 |
* 1.2.32 13 10232 12.so.0.32[.0]
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|
212 |
* 1.2.33beta01-02 13 10233 12.so.0.33[.0]
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|
213 |
* 1.2.33rc01-02 13 10233 12.so.0.33[.0]
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|
214 |
* 1.0.41rc01 10 10041 10.so.0.41[.0]
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|
215 |
* 1.2.33 13 10233 12.so.0.33[.0]
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|
216 |
* 1.0.41 10 10041 10.so.0.41[.0]
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217 |
* 1.2.34beta01-07 13 10234 12.so.0.34[.0]
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|
218 |
* 1.0.42rc01 10 10042 10.so.0.42[.0]
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219 |
* 1.2.34rc01 13 10234 12.so.0.34[.0]
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220 |
* 1.0.42 10 10042 10.so.0.42[.0]
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221 |
* 1.2.34 13 10234 12.so.0.34[.0]
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222 |
* 1.2.35beta01-03 13 10235 12.so.0.35[.0]
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223 |
* 1.0.43rc01-02 10 10043 10.so.0.43[.0]
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224 |
* 1.2.35rc01-02 13 10235 12.so.0.35[.0]
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225 |
* 1.0.43 10 10043 10.so.0.43[.0]
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226 |
* 1.2.35 13 10235 12.so.0.35[.0]
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|
227 |
* 1.2.36beta01-05 13 10236 12.so.0.36[.0]
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228 |
* 1.2.36rc01 13 10236 12.so.0.36[.0]
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229 |
* 1.0.44 10 10044 10.so.0.44[.0]
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230 |
* 1.2.36 13 10236 12.so.0.36[.0]
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231 |
* 1.2.37beta01-03 13 10237 12.so.0.37[.0]
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232 |
* 1.2.37rc01 13 10237 12.so.0.37[.0]
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|
233 |
* 1.2.37 13 10237 12.so.0.37[.0]
|
|
|
234 |
* 1.2.45 10 10045 12.so.0.45[.0]
|
|
|
235 |
* 1.0.46 10 10046 10.so.0.46[.0]
|
|
|
236 |
* 1.2.38beta01 13 10238 12.so.0.38[.0]
|
|
|
237 |
* 1.2.38rc01-03 13 10238 12.so.0.38[.0]
|
|
|
238 |
* 1.0.47 10 10047 10.so.0.47[.0]
|
|
|
239 |
* 1.2.38 13 10238 12.so.0.38[.0]
|
|
|
240 |
* 1.2.39beta01-05 13 10239 12.so.0.39[.0]
|
|
|
241 |
* 1.2.39rc01 13 10239 12.so.0.39[.0]
|
|
|
242 |
* 1.0.48 10 10048 10.so.0.48[.0]
|
|
|
243 |
* 1.2.39 13 10239 12.so.0.39[.0]
|
|
|
244 |
* 1.2.40beta01 13 10240 12.so.0.40[.0]
|
|
|
245 |
* 1.2.40rc01 13 10240 12.so.0.40[.0]
|
|
|
246 |
* 1.0.49 10 10049 10.so.0.49[.0]
|
|
|
247 |
* 1.2.40 13 10240 12.so.0.40[.0]
|
|
|
248 |
*
|
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|
249 |
* Henceforth the source version will match the shared-library major
|
|
|
250 |
* and minor numbers; the shared-library major version number will be
|
|
|
251 |
* used for changes in backward compatibility, as it is intended. The
|
|
|
252 |
* PNG_LIBPNG_VER macro, which is not used within libpng but is available
|
|
|
253 |
* for applications, is an unsigned integer of the form xyyzz corresponding
|
|
|
254 |
* to the source version x.y.z (leading zeros in y and z). Beta versions
|
|
|
255 |
* were given the previous public release number plus a letter, until
|
|
|
256 |
* version 1.0.6j; from then on they were given the upcoming public
|
|
|
257 |
* release number plus "betaNN" or "rcNN".
|
|
|
258 |
*
|
|
|
259 |
* Binary incompatibility exists only when applications make direct access
|
|
|
260 |
* to the info_ptr or png_ptr members through png.h, and the compiled
|
|
|
261 |
* application is loaded with a different version of the library.
|
|
|
262 |
*
|
|
|
263 |
* DLLNUM will change each time there are forward or backward changes
|
|
|
264 |
* in binary compatibility (e.g., when a new feature is added).
|
|
|
265 |
*
|
|
|
266 |
* See libpng.txt or libpng.3 for more information. The PNG specification
|
|
|
267 |
* is available as a W3C Recommendation and as an ISO Specification,
|
|
|
268 |
* <http://www.w3.org/TR/2003/REC-PNG-20031110/
|
|
|
269 |
*/
|
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|
270 |
|
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|
271 |
/*
|
|
|
272 |
* COPYRIGHT NOTICE, DISCLAIMER, and LICENSE:
|
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|
273 |
*
|
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|
274 |
* If you modify libpng you may insert additional notices immediately following
|
|
|
275 |
* this sentence.
|
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|
276 |
*
|
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|
277 |
* This code is released under the libpng license.
|
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|
278 |
*
|
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|
279 |
* libpng versions 1.2.6, August 15, 2004, through 1.2.40, September 10, 2009, are
|
|
|
280 |
* Copyright (c) 2004, 2006-2009 Glenn Randers-Pehrson, and are
|
|
|
281 |
* distributed according to the same disclaimer and license as libpng-1.2.5
|
|
|
282 |
* with the following individual added to the list of Contributing Authors:
|
|
|
283 |
*
|
|
|
284 |
* Cosmin Truta
|
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|
285 |
*
|
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|
286 |
* libpng versions 1.0.7, July 1, 2000, through 1.2.5, October 3, 2002, are
|
|
|
287 |
* Copyright (c) 2000-2002 Glenn Randers-Pehrson, and are
|
|
|
288 |
* distributed according to the same disclaimer and license as libpng-1.0.6
|
|
|
289 |
* with the following individuals added to the list of Contributing Authors:
|
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|
290 |
*
|
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|
291 |
* Simon-Pierre Cadieux
|
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|
292 |
* Eric S. Raymond
|
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|
293 |
* Gilles Vollant
|
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|
294 |
*
|
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|
295 |
* and with the following additions to the disclaimer:
|
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|
296 |
*
|
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|
297 |
* There is no warranty against interference with your enjoyment of the
|
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|
298 |
* library or against infringement. There is no warranty that our
|
|
|
299 |
* efforts or the library will fulfill any of your particular purposes
|
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|
300 |
* or needs. This library is provided with all faults, and the entire
|
|
|
301 |
* risk of satisfactory quality, performance, accuracy, and effort is with
|
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|
302 |
* the user.
|
|
|
303 |
*
|
|
|
304 |
* libpng versions 0.97, January 1998, through 1.0.6, March 20, 2000, are
|
|
|
305 |
* Copyright (c) 1998, 1999, 2000 Glenn Randers-Pehrson, and are
|
|
|
306 |
* distributed according to the same disclaimer and license as libpng-0.96,
|
|
|
307 |
* with the following individuals added to the list of Contributing Authors:
|
|
|
308 |
*
|
|
|
309 |
* Tom Lane
|
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|
310 |
* Glenn Randers-Pehrson
|
|
|
311 |
* Willem van Schaik
|
|
|
312 |
*
|
|
|
313 |
* libpng versions 0.89, June 1996, through 0.96, May 1997, are
|
|
|
314 |
* Copyright (c) 1996, 1997 Andreas Dilger
|
|
|
315 |
* Distributed according to the same disclaimer and license as libpng-0.88,
|
|
|
316 |
* with the following individuals added to the list of Contributing Authors:
|
|
|
317 |
*
|
|
|
318 |
* John Bowler
|
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|
319 |
* Kevin Bracey
|
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|
320 |
* Sam Bushell
|
|
|
321 |
* Magnus Holmgren
|
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|
322 |
* Greg Roelofs
|
|
|
323 |
* Tom Tanner
|
|
|
324 |
*
|
|
|
325 |
* libpng versions 0.5, May 1995, through 0.88, January 1996, are
|
|
|
326 |
* Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.
|
|
|
327 |
*
|
|
|
328 |
* For the purposes of this copyright and license, "Contributing Authors"
|
|
|
329 |
* is defined as the following set of individuals:
|
|
|
330 |
*
|
|
|
331 |
* Andreas Dilger
|
|
|
332 |
* Dave Martindale
|
|
|
333 |
* Guy Eric Schalnat
|
|
|
334 |
* Paul Schmidt
|
|
|
335 |
* Tim Wegner
|
|
|
336 |
*
|
|
|
337 |
* The PNG Reference Library is supplied "AS IS". The Contributing Authors
|
|
|
338 |
* and Group 42, Inc. disclaim all warranties, expressed or implied,
|
|
|
339 |
* including, without limitation, the warranties of merchantability and of
|
|
|
340 |
* fitness for any purpose. The Contributing Authors and Group 42, Inc.
|
|
|
341 |
* assume no liability for direct, indirect, incidental, special, exemplary,
|
|
|
342 |
* or consequential damages, which may result from the use of the PNG
|
|
|
343 |
* Reference Library, even if advised of the possibility of such damage.
|
|
|
344 |
*
|
|
|
345 |
* Permission is hereby granted to use, copy, modify, and distribute this
|
|
|
346 |
* source code, or portions hereof, for any purpose, without fee, subject
|
|
|
347 |
* to the following restrictions:
|
|
|
348 |
*
|
|
|
349 |
* 1. The origin of this source code must not be misrepresented.
|
|
|
350 |
*
|
|
|
351 |
* 2. Altered versions must be plainly marked as such and
|
|
|
352 |
* must not be misrepresented as being the original source.
|
|
|
353 |
*
|
|
|
354 |
* 3. This Copyright notice may not be removed or altered from
|
|
|
355 |
* any source or altered source distribution.
|
|
|
356 |
*
|
|
|
357 |
* The Contributing Authors and Group 42, Inc. specifically permit, without
|
|
|
358 |
* fee, and encourage the use of this source code as a component to
|
|
|
359 |
* supporting the PNG file format in commercial products. If you use this
|
|
|
360 |
* source code in a product, acknowledgment is not required but would be
|
|
|
361 |
* appreciated.
|
|
|
362 |
*/
|
|
|
363 |
|
|
|
364 |
/*
|
|
|
365 |
* A "png_get_copyright" function is available, for convenient use in "about"
|
|
|
366 |
* boxes and the like:
|
|
|
367 |
*
|
|
|
368 |
* printf("%s",png_get_copyright(NULL));
|
|
|
369 |
*
|
|
|
370 |
* Also, the PNG logo (in PNG format, of course) is supplied in the
|
|
|
371 |
* files "pngbar.png" and "pngbar.jpg (88x31) and "pngnow.png" (98x31).
|
|
|
372 |
*/
|
|
|
373 |
|
|
|
374 |
/*
|
|
|
375 |
* Libpng is OSI Certified Open Source Software. OSI Certified is a
|
|
|
376 |
* certification mark of the Open Source Initiative.
|
|
|
377 |
*/
|
|
|
378 |
|
|
|
379 |
/*
|
|
|
380 |
* The contributing authors would like to thank all those who helped
|
|
|
381 |
* with testing, bug fixes, and patience. This wouldn't have been
|
|
|
382 |
* possible without all of you.
|
|
|
383 |
*
|
|
|
384 |
* Thanks to Frank J. T. Wojcik for helping with the documentation.
|
|
|
385 |
*/
|
|
|
386 |
|
|
|
387 |
/*
|
|
|
388 |
* Y2K compliance in libpng:
|
|
|
389 |
* =========================
|
|
|
390 |
*
|
|
|
391 |
* September 10, 2009
|
|
|
392 |
*
|
|
|
393 |
* Since the PNG Development group is an ad-hoc body, we can't make
|
|
|
394 |
* an official declaration.
|
|
|
395 |
*
|
|
|
396 |
* This is your unofficial assurance that libpng from version 0.71 and
|
|
|
397 |
* upward through 1.2.40 are Y2K compliant. It is my belief that earlier
|
|
|
398 |
* versions were also Y2K compliant.
|
|
|
399 |
*
|
|
|
400 |
* Libpng only has three year fields. One is a 2-byte unsigned integer
|
|
|
401 |
* that will hold years up to 65535. The other two hold the date in text
|
|
|
402 |
* format, and will hold years up to 9999.
|
|
|
403 |
*
|
|
|
404 |
* The integer is
|
|
|
405 |
* "png_uint_16 year" in png_time_struct.
|
|
|
406 |
*
|
|
|
407 |
* The strings are
|
|
|
408 |
* "png_charp time_buffer" in png_struct and
|
|
|
409 |
* "near_time_buffer", which is a local character string in png.c.
|
|
|
410 |
*
|
|
|
411 |
* There are seven time-related functions:
|
|
|
412 |
* png.c: png_convert_to_rfc_1123() in png.c
|
|
|
413 |
* (formerly png_convert_to_rfc_1152() in error)
|
|
|
414 |
* png_convert_from_struct_tm() in pngwrite.c, called in pngwrite.c
|
|
|
415 |
* png_convert_from_time_t() in pngwrite.c
|
|
|
416 |
* png_get_tIME() in pngget.c
|
|
|
417 |
* png_handle_tIME() in pngrutil.c, called in pngread.c
|
|
|
418 |
* png_set_tIME() in pngset.c
|
|
|
419 |
* png_write_tIME() in pngwutil.c, called in pngwrite.c
|
|
|
420 |
*
|
|
|
421 |
* All handle dates properly in a Y2K environment. The
|
|
|
422 |
* png_convert_from_time_t() function calls gmtime() to convert from system
|
|
|
423 |
* clock time, which returns (year - 1900), which we properly convert to
|
|
|
424 |
* the full 4-digit year. There is a possibility that applications using
|
|
|
425 |
* libpng are not passing 4-digit years into the png_convert_to_rfc_1123()
|
|
|
426 |
* function, or that they are incorrectly passing only a 2-digit year
|
|
|
427 |
* instead of "year - 1900" into the png_convert_from_struct_tm() function,
|
|
|
428 |
* but this is not under our control. The libpng documentation has always
|
|
|
429 |
* stated that it works with 4-digit years, and the APIs have been
|
|
|
430 |
* documented as such.
|
|
|
431 |
*
|
|
|
432 |
* The tIME chunk itself is also Y2K compliant. It uses a 2-byte unsigned
|
|
|
433 |
* integer to hold the year, and can hold years as large as 65535.
|
|
|
434 |
*
|
|
|
435 |
* zlib, upon which libpng depends, is also Y2K compliant. It contains
|
|
|
436 |
* no date-related code.
|
|
|
437 |
*
|
|
|
438 |
* Glenn Randers-Pehrson
|
|
|
439 |
* libpng maintainer
|
|
|
440 |
* PNG Development Group
|
|
|
441 |
*/
|
|
|
442 |
|
|
|
443 |
#ifndef PNG_H
|
|
|
444 |
#define PNG_H
|
|
|
445 |
|
|
|
446 |
/* This is not the place to learn how to use libpng. The file libpng.txt
|
|
|
447 |
* describes how to use libpng, and the file example.c summarizes it
|
|
|
448 |
* with some code on which to build. This file is useful for looking
|
|
|
449 |
* at the actual function definitions and structure components.
|
|
|
450 |
*/
|
|
|
451 |
|
|
|
452 |
/* Version information for png.h - this should match the version in png.c */
|
|
|
453 |
#define PNG_LIBPNG_VER_STRING "1.2.40"
|
|
|
454 |
#define PNG_HEADER_VERSION_STRING \
|
|
|
455 |
" libpng version 1.2.40 - September 10, 2009\n"
|
|
|
456 |
|
|
|
457 |
#define PNG_LIBPNG_VER_SONUM 0
|
|
|
458 |
#define PNG_LIBPNG_VER_DLLNUM 13
|
|
|
459 |
|
|
|
460 |
/* These should match the first 3 components of PNG_LIBPNG_VER_STRING: */
|
|
|
461 |
#define PNG_LIBPNG_VER_MAJOR 1
|
|
|
462 |
#define PNG_LIBPNG_VER_MINOR 2
|
|
|
463 |
#define PNG_LIBPNG_VER_RELEASE 40
|
|
|
464 |
/* This should match the numeric part of the final component of
|
|
|
465 |
* PNG_LIBPNG_VER_STRING, omitting any leading zero:
|
|
|
466 |
*/
|
|
|
467 |
|
|
|
468 |
#define PNG_LIBPNG_VER_BUILD 0
|
|
|
469 |
|
|
|
470 |
/* Release Status */
|
|
|
471 |
#define PNG_LIBPNG_BUILD_ALPHA 1
|
|
|
472 |
#define PNG_LIBPNG_BUILD_BETA 2
|
|
|
473 |
#define PNG_LIBPNG_BUILD_RC 3
|
|
|
474 |
#define PNG_LIBPNG_BUILD_STABLE 4
|
|
|
475 |
#define PNG_LIBPNG_BUILD_RELEASE_STATUS_MASK 7
|
|
|
476 |
|
|
|
477 |
/* Release-Specific Flags */
|
|
|
478 |
#define PNG_LIBPNG_BUILD_PATCH 8 /* Can be OR'ed with
|
|
|
479 |
PNG_LIBPNG_BUILD_STABLE only */
|
|
|
480 |
#define PNG_LIBPNG_BUILD_PRIVATE 16 /* Cannot be OR'ed with
|
|
|
481 |
PNG_LIBPNG_BUILD_SPECIAL */
|
|
|
482 |
#define PNG_LIBPNG_BUILD_SPECIAL 32 /* Cannot be OR'ed with
|
|
|
483 |
PNG_LIBPNG_BUILD_PRIVATE */
|
|
|
484 |
|
|
|
485 |
#define PNG_LIBPNG_BUILD_BASE_TYPE PNG_LIBPNG_BUILD_STABLE
|
|
|
486 |
|
|
|
487 |
/* Careful here. At one time, Guy wanted to use 082, but that would be octal.
|
|
|
488 |
* We must not include leading zeros.
|
|
|
489 |
* Versions 0.7 through 1.0.0 were in the range 0 to 100 here (only
|
|
|
490 |
* version 1.0.0 was mis-numbered 100 instead of 10000). From
|
|
|
491 |
* version 1.0.1 it's xxyyzz, where x=major, y=minor, z=release
|
|
|
492 |
*/
|
|
|
493 |
#define PNG_LIBPNG_VER 10240 /* 1.2.40 */
|
|
|
494 |
|
|
|
495 |
#ifndef PNG_VERSION_INFO_ONLY
|
|
|
496 |
/* Include the compression library's header */
|
|
|
497 |
#include "zlib.h"
|
|
|
498 |
#endif
|
|
|
499 |
|
|
|
500 |
/* Include all user configurable info, including optional assembler routines */
|
|
|
501 |
#include "pngconf.h"
|
|
|
502 |
|
|
|
503 |
/*
|
|
|
504 |
* Added at libpng-1.2.8 */
|
|
|
505 |
/* Ref MSDN: Private as priority over Special
|
|
|
506 |
* VS_FF_PRIVATEBUILD File *was not* built using standard release
|
|
|
507 |
* procedures. If this value is given, the StringFileInfo block must
|
|
|
508 |
* contain a PrivateBuild string.
|
|
|
509 |
*
|
|
|
510 |
* VS_FF_SPECIALBUILD File *was* built by the original company using
|
|
|
511 |
* standard release procedures but is a variation of the standard
|
|
|
512 |
* file of the same version number. If this value is given, the
|
|
|
513 |
* StringFileInfo block must contain a SpecialBuild string.
|
|
|
514 |
*/
|
|
|
515 |
|
|
|
516 |
#if defined(PNG_USER_PRIVATEBUILD)
|
|
|
517 |
# define PNG_LIBPNG_BUILD_TYPE \
|
|
|
518 |
(PNG_LIBPNG_BUILD_BASE_TYPE | PNG_LIBPNG_BUILD_PRIVATE)
|
|
|
519 |
#else
|
|
|
520 |
# if defined(PNG_LIBPNG_SPECIALBUILD)
|
|
|
521 |
# define PNG_LIBPNG_BUILD_TYPE \
|
|
|
522 |
(PNG_LIBPNG_BUILD_BASE_TYPE | PNG_LIBPNG_BUILD_SPECIAL)
|
|
|
523 |
# else
|
|
|
524 |
# define PNG_LIBPNG_BUILD_TYPE (PNG_LIBPNG_BUILD_BASE_TYPE)
|
|
|
525 |
# endif
|
|
|
526 |
#endif
|
|
|
527 |
|
|
|
528 |
#ifndef PNG_VERSION_INFO_ONLY
|
|
|
529 |
|
|
|
530 |
/* Inhibit C++ name-mangling for libpng functions but not for system calls. */
|
|
|
531 |
#ifdef __cplusplus
|
|
|
532 |
extern "C" {
|
|
|
533 |
#endif /* __cplusplus */
|
|
|
534 |
|
|
|
535 |
/* This file is arranged in several sections. The first section contains
|
|
|
536 |
* structure and type definitions. The second section contains the external
|
|
|
537 |
* library functions, while the third has the internal library functions,
|
|
|
538 |
* which applications aren't expected to use directly.
|
|
|
539 |
*/
|
|
|
540 |
|
|
|
541 |
#ifndef PNG_NO_TYPECAST_NULL
|
|
|
542 |
#define int_p_NULL (int *)NULL
|
|
|
543 |
#define png_bytep_NULL (png_bytep)NULL
|
|
|
544 |
#define png_bytepp_NULL (png_bytepp)NULL
|
|
|
545 |
#define png_doublep_NULL (png_doublep)NULL
|
|
|
546 |
#define png_error_ptr_NULL (png_error_ptr)NULL
|
|
|
547 |
#define png_flush_ptr_NULL (png_flush_ptr)NULL
|
|
|
548 |
#define png_free_ptr_NULL (png_free_ptr)NULL
|
|
|
549 |
#define png_infopp_NULL (png_infopp)NULL
|
|
|
550 |
#define png_malloc_ptr_NULL (png_malloc_ptr)NULL
|
|
|
551 |
#define png_read_status_ptr_NULL (png_read_status_ptr)NULL
|
|
|
552 |
#define png_rw_ptr_NULL (png_rw_ptr)NULL
|
|
|
553 |
#define png_structp_NULL (png_structp)NULL
|
|
|
554 |
#define png_uint_16p_NULL (png_uint_16p)NULL
|
|
|
555 |
#define png_voidp_NULL (png_voidp)NULL
|
|
|
556 |
#define png_write_status_ptr_NULL (png_write_status_ptr)NULL
|
|
|
557 |
#else
|
|
|
558 |
#define int_p_NULL NULL
|
|
|
559 |
#define png_bytep_NULL NULL
|
|
|
560 |
#define png_bytepp_NULL NULL
|
|
|
561 |
#define png_doublep_NULL NULL
|
|
|
562 |
#define png_error_ptr_NULL NULL
|
|
|
563 |
#define png_flush_ptr_NULL NULL
|
|
|
564 |
#define png_free_ptr_NULL NULL
|
|
|
565 |
#define png_infopp_NULL NULL
|
|
|
566 |
#define png_malloc_ptr_NULL NULL
|
|
|
567 |
#define png_read_status_ptr_NULL NULL
|
|
|
568 |
#define png_rw_ptr_NULL NULL
|
|
|
569 |
#define png_structp_NULL NULL
|
|
|
570 |
#define png_uint_16p_NULL NULL
|
|
|
571 |
#define png_voidp_NULL NULL
|
|
|
572 |
#define png_write_status_ptr_NULL NULL
|
|
|
573 |
#endif
|
|
|
574 |
|
|
|
575 |
/* Variables declared in png.c - only it needs to define PNG_NO_EXTERN */
|
|
|
576 |
#if !defined(PNG_NO_EXTERN) || defined(PNG_ALWAYS_EXTERN)
|
|
|
577 |
/* Version information for C files, stored in png.c. This had better match
|
|
|
578 |
* the version above.
|
|
|
579 |
*/
|
|
|
580 |
#ifdef PNG_USE_GLOBAL_ARRAYS
|
|
|
581 |
PNG_EXPORT_VAR (PNG_CONST char) png_libpng_ver[18];
|
|
|
582 |
/* Need room for 99.99.99beta99z */
|
|
|
583 |
#else
|
|
|
584 |
#define png_libpng_ver png_get_header_ver(NULL)
|
|
|
585 |
#endif
|
|
|
586 |
|
|
|
587 |
#ifdef PNG_USE_GLOBAL_ARRAYS
|
|
|
588 |
/* This was removed in version 1.0.5c */
|
|
|
589 |
/* Structures to facilitate easy interlacing. See png.c for more details */
|
|
|
590 |
PNG_EXPORT_VAR (PNG_CONST int FARDATA) png_pass_start[7];
|
|
|
591 |
PNG_EXPORT_VAR (PNG_CONST int FARDATA) png_pass_inc[7];
|
|
|
592 |
PNG_EXPORT_VAR (PNG_CONST int FARDATA) png_pass_ystart[7];
|
|
|
593 |
PNG_EXPORT_VAR (PNG_CONST int FARDATA) png_pass_yinc[7];
|
|
|
594 |
PNG_EXPORT_VAR (PNG_CONST int FARDATA) png_pass_mask[7];
|
|
|
595 |
PNG_EXPORT_VAR (PNG_CONST int FARDATA) png_pass_dsp_mask[7];
|
|
|
596 |
/* This isn't currently used. If you need it, see png.c for more details.
|
|
|
597 |
PNG_EXPORT_VAR (PNG_CONST int FARDATA) png_pass_height[7];
|
|
|
598 |
*/
|
|
|
599 |
#endif
|
|
|
600 |
|
|
|
601 |
#endif /* PNG_NO_EXTERN */
|
|
|
602 |
|
|
|
603 |
/* Three color definitions. The order of the red, green, and blue, (and the
|
|
|
604 |
* exact size) is not important, although the size of the fields need to
|
|
|
605 |
* be png_byte or png_uint_16 (as defined below).
|
|
|
606 |
*/
|
|
|
607 |
typedef struct png_color_struct
|
|
|
608 |
{
|
|
|
609 |
png_byte red;
|
|
|
610 |
png_byte green;
|
|
|
611 |
png_byte blue;
|
|
|
612 |
} png_color;
|
|
|
613 |
typedef png_color FAR * png_colorp;
|
|
|
614 |
typedef png_color FAR * FAR * png_colorpp;
|
|
|
615 |
|
|
|
616 |
typedef struct png_color_16_struct
|
|
|
617 |
{
|
|
|
618 |
png_byte index; /* used for palette files */
|
|
|
619 |
png_uint_16 red; /* for use in red green blue files */
|
|
|
620 |
png_uint_16 green;
|
|
|
621 |
png_uint_16 blue;
|
|
|
622 |
png_uint_16 gray; /* for use in grayscale files */
|
|
|
623 |
} png_color_16;
|
|
|
624 |
typedef png_color_16 FAR * png_color_16p;
|
|
|
625 |
typedef png_color_16 FAR * FAR * png_color_16pp;
|
|
|
626 |
|
|
|
627 |
typedef struct png_color_8_struct
|
|
|
628 |
{
|
|
|
629 |
png_byte red; /* for use in red green blue files */
|
|
|
630 |
png_byte green;
|
|
|
631 |
png_byte blue;
|
|
|
632 |
png_byte gray; /* for use in grayscale files */
|
|
|
633 |
png_byte alpha; /* for alpha channel files */
|
|
|
634 |
} png_color_8;
|
|
|
635 |
typedef png_color_8 FAR * png_color_8p;
|
|
|
636 |
typedef png_color_8 FAR * FAR * png_color_8pp;
|
|
|
637 |
|
|
|
638 |
/*
|
|
|
639 |
* The following two structures are used for the in-core representation
|
|
|
640 |
* of sPLT chunks.
|
|
|
641 |
*/
|
|
|
642 |
typedef struct png_sPLT_entry_struct
|
|
|
643 |
{
|
|
|
644 |
png_uint_16 red;
|
|
|
645 |
png_uint_16 green;
|
|
|
646 |
png_uint_16 blue;
|
|
|
647 |
png_uint_16 alpha;
|
|
|
648 |
png_uint_16 frequency;
|
|
|
649 |
} png_sPLT_entry;
|
|
|
650 |
typedef png_sPLT_entry FAR * png_sPLT_entryp;
|
|
|
651 |
typedef png_sPLT_entry FAR * FAR * png_sPLT_entrypp;
|
|
|
652 |
|
|
|
653 |
/* When the depth of the sPLT palette is 8 bits, the color and alpha samples
|
|
|
654 |
* occupy the LSB of their respective members, and the MSB of each member
|
|
|
655 |
* is zero-filled. The frequency member always occupies the full 16 bits.
|
|
|
656 |
*/
|
|
|
657 |
|
|
|
658 |
typedef struct png_sPLT_struct
|
|
|
659 |
{
|
|
|
660 |
png_charp name; /* palette name */
|
|
|
661 |
png_byte depth; /* depth of palette samples */
|
|
|
662 |
png_sPLT_entryp entries; /* palette entries */
|
|
|
663 |
png_int_32 nentries; /* number of palette entries */
|
|
|
664 |
} png_sPLT_t;
|
|
|
665 |
typedef png_sPLT_t FAR * png_sPLT_tp;
|
|
|
666 |
typedef png_sPLT_t FAR * FAR * png_sPLT_tpp;
|
|
|
667 |
|
|
|
668 |
#ifdef PNG_TEXT_SUPPORTED
|
|
|
669 |
/* png_text holds the contents of a text/ztxt/itxt chunk in a PNG file,
|
|
|
670 |
* and whether that contents is compressed or not. The "key" field
|
|
|
671 |
* points to a regular zero-terminated C string. The "text", "lang", and
|
|
|
672 |
* "lang_key" fields can be regular C strings, empty strings, or NULL pointers.
|
|
|
673 |
* However, the * structure returned by png_get_text() will always contain
|
|
|
674 |
* regular zero-terminated C strings (possibly empty), never NULL pointers,
|
|
|
675 |
* so they can be safely used in printf() and other string-handling functions.
|
|
|
676 |
*/
|
|
|
677 |
typedef struct png_text_struct
|
|
|
678 |
{
|
|
|
679 |
int compression; /* compression value:
|
|
|
680 |
-1: tEXt, none
|
|
|
681 |
0: zTXt, deflate
|
|
|
682 |
1: iTXt, none
|
|
|
683 |
2: iTXt, deflate */
|
|
|
684 |
png_charp key; /* keyword, 1-79 character description of "text" */
|
|
|
685 |
png_charp text; /* comment, may be an empty string (ie "")
|
|
|
686 |
or a NULL pointer */
|
|
|
687 |
png_size_t text_length; /* length of the text string */
|
|
|
688 |
#ifdef PNG_iTXt_SUPPORTED
|
|
|
689 |
png_size_t itxt_length; /* length of the itxt string */
|
|
|
690 |
png_charp lang; /* language code, 0-79 characters
|
|
|
691 |
or a NULL pointer */
|
|
|
692 |
png_charp lang_key; /* keyword translated UTF-8 string, 0 or more
|
|
|
693 |
chars or a NULL pointer */
|
|
|
694 |
#endif
|
|
|
695 |
} png_text;
|
|
|
696 |
typedef png_text FAR * png_textp;
|
|
|
697 |
typedef png_text FAR * FAR * png_textpp;
|
|
|
698 |
#endif
|
|
|
699 |
|
|
|
700 |
/* Supported compression types for text in PNG files (tEXt, and zTXt).
|
|
|
701 |
* The values of the PNG_TEXT_COMPRESSION_ defines should NOT be changed.
|
|
|
702 |
*/
|
|
|
703 |
#define PNG_TEXT_COMPRESSION_NONE_WR -3
|
|
|
704 |
#define PNG_TEXT_COMPRESSION_zTXt_WR -2
|
|
|
705 |
#define PNG_TEXT_COMPRESSION_NONE -1
|
|
|
706 |
#define PNG_TEXT_COMPRESSION_zTXt 0
|
|
|
707 |
#define PNG_ITXT_COMPRESSION_NONE 1
|
|
|
708 |
#define PNG_ITXT_COMPRESSION_zTXt 2
|
|
|
709 |
#define PNG_TEXT_COMPRESSION_LAST 3 /* Not a valid value */
|
|
|
710 |
|
|
|
711 |
/* png_time is a way to hold the time in an machine independent way.
|
|
|
712 |
* Two conversions are provided, both from time_t and struct tm. There
|
|
|
713 |
* is no portable way to convert to either of these structures, as far
|
|
|
714 |
* as I know. If you know of a portable way, send it to me. As a side
|
|
|
715 |
* note - PNG has always been Year 2000 compliant!
|
|
|
716 |
*/
|
|
|
717 |
typedef struct png_time_struct
|
|
|
718 |
{
|
|
|
719 |
png_uint_16 year; /* full year, as in, 1995 */
|
|
|
720 |
png_byte month; /* month of year, 1 - 12 */
|
|
|
721 |
png_byte day; /* day of month, 1 - 31 */
|
|
|
722 |
png_byte hour; /* hour of day, 0 - 23 */
|
|
|
723 |
png_byte minute; /* minute of hour, 0 - 59 */
|
|
|
724 |
png_byte second; /* second of minute, 0 - 60 (for leap seconds) */
|
|
|
725 |
} png_time;
|
|
|
726 |
typedef png_time FAR * png_timep;
|
|
|
727 |
typedef png_time FAR * FAR * png_timepp;
|
|
|
728 |
|
|
|
729 |
#if defined(PNG_UNKNOWN_CHUNKS_SUPPORTED) || \
|
|
|
730 |
defined(PNG_HANDLE_AS_UNKNOWN_SUPPORTED)
|
|
|
731 |
/* png_unknown_chunk is a structure to hold queued chunks for which there is
|
|
|
732 |
* no specific support. The idea is that we can use this to queue
|
|
|
733 |
* up private chunks for output even though the library doesn't actually
|
|
|
734 |
* know about their semantics.
|
|
|
735 |
*/
|
|
|
736 |
#define PNG_CHUNK_NAME_LENGTH 5
|
|
|
737 |
typedef struct png_unknown_chunk_t
|
|
|
738 |
{
|
|
|
739 |
png_byte name[PNG_CHUNK_NAME_LENGTH];
|
|
|
740 |
png_byte *data;
|
|
|
741 |
png_size_t size;
|
|
|
742 |
|
|
|
743 |
/* libpng-using applications should NOT directly modify this byte. */
|
|
|
744 |
png_byte location; /* mode of operation at read time */
|
|
|
745 |
}
|
|
|
746 |
png_unknown_chunk;
|
|
|
747 |
typedef png_unknown_chunk FAR * png_unknown_chunkp;
|
|
|
748 |
typedef png_unknown_chunk FAR * FAR * png_unknown_chunkpp;
|
|
|
749 |
#endif
|
|
|
750 |
|
|
|
751 |
/* png_info is a structure that holds the information in a PNG file so
|
|
|
752 |
* that the application can find out the characteristics of the image.
|
|
|
753 |
* If you are reading the file, this structure will tell you what is
|
|
|
754 |
* in the PNG file. If you are writing the file, fill in the information
|
|
|
755 |
* you want to put into the PNG file, then call png_write_info().
|
|
|
756 |
* The names chosen should be very close to the PNG specification, so
|
|
|
757 |
* consult that document for information about the meaning of each field.
|
|
|
758 |
*
|
|
|
759 |
* With libpng < 0.95, it was only possible to directly set and read the
|
|
|
760 |
* the values in the png_info_struct, which meant that the contents and
|
|
|
761 |
* order of the values had to remain fixed. With libpng 0.95 and later,
|
|
|
762 |
* however, there are now functions that abstract the contents of
|
|
|
763 |
* png_info_struct from the application, so this makes it easier to use
|
|
|
764 |
* libpng with dynamic libraries, and even makes it possible to use
|
|
|
765 |
* libraries that don't have all of the libpng ancillary chunk-handing
|
|
|
766 |
* functionality.
|
|
|
767 |
*
|
|
|
768 |
* In any case, the order of the parameters in png_info_struct should NOT
|
|
|
769 |
* be changed for as long as possible to keep compatibility with applications
|
|
|
770 |
* that use the old direct-access method with png_info_struct.
|
|
|
771 |
*
|
|
|
772 |
* The following members may have allocated storage attached that should be
|
|
|
773 |
* cleaned up before the structure is discarded: palette, trans, text,
|
|
|
774 |
* pcal_purpose, pcal_units, pcal_params, hist, iccp_name, iccp_profile,
|
|
|
775 |
* splt_palettes, scal_unit, row_pointers, and unknowns. By default, these
|
|
|
776 |
* are automatically freed when the info structure is deallocated, if they were
|
|
|
777 |
* allocated internally by libpng. This behavior can be changed by means
|
|
|
778 |
* of the png_data_freer() function.
|
|
|
779 |
*
|
|
|
780 |
* More allocation details: all the chunk-reading functions that
|
|
|
781 |
* change these members go through the corresponding png_set_*
|
|
|
782 |
* functions. A function to clear these members is available: see
|
|
|
783 |
* png_free_data(). The png_set_* functions do not depend on being
|
|
|
784 |
* able to point info structure members to any of the storage they are
|
|
|
785 |
* passed (they make their own copies), EXCEPT that the png_set_text
|
|
|
786 |
* functions use the same storage passed to them in the text_ptr or
|
|
|
787 |
* itxt_ptr structure argument, and the png_set_rows and png_set_unknowns
|
|
|
788 |
* functions do not make their own copies.
|
|
|
789 |
*/
|
|
|
790 |
typedef struct png_info_struct
|
|
|
791 |
{
|
|
|
792 |
/* The following are necessary for every PNG file */
|
|
|
793 |
png_uint_32 width; /* width of image in pixels (from IHDR) */
|
|
|
794 |
png_uint_32 height; /* height of image in pixels (from IHDR) */
|
|
|
795 |
png_uint_32 valid; /* valid chunk data (see PNG_INFO_ below) */
|
|
|
796 |
png_uint_32 rowbytes; /* bytes needed to hold an untransformed row */
|
|
|
797 |
png_colorp palette; /* array of color values (valid & PNG_INFO_PLTE) */
|
|
|
798 |
png_uint_16 num_palette; /* number of color entries in "palette" (PLTE) */
|
|
|
799 |
png_uint_16 num_trans; /* number of transparent palette color (tRNS) */
|
|
|
800 |
png_byte bit_depth; /* 1, 2, 4, 8, or 16 bits/channel (from IHDR) */
|
|
|
801 |
png_byte color_type; /* see PNG_COLOR_TYPE_ below (from IHDR) */
|
|
|
802 |
/* The following three should have been named *_method not *_type */
|
|
|
803 |
png_byte compression_type; /* must be PNG_COMPRESSION_TYPE_BASE (IHDR) */
|
|
|
804 |
png_byte filter_type; /* must be PNG_FILTER_TYPE_BASE (from IHDR) */
|
|
|
805 |
png_byte interlace_type; /* One of PNG_INTERLACE_NONE, PNG_INTERLACE_ADAM7 */
|
|
|
806 |
|
|
|
807 |
/* The following is informational only on read, and not used on writes. */
|
|
|
808 |
png_byte channels; /* number of data channels per pixel (1, 2, 3, 4) */
|
|
|
809 |
png_byte pixel_depth; /* number of bits per pixel */
|
|
|
810 |
png_byte spare_byte; /* to align the data, and for future use */
|
|
|
811 |
png_byte signature[8]; /* magic bytes read by libpng from start of file */
|
|
|
812 |
|
|
|
813 |
/* The rest of the data is optional. If you are reading, check the
|
|
|
814 |
* valid field to see if the information in these are valid. If you
|
|
|
815 |
* are writing, set the valid field to those chunks you want written,
|
|
|
816 |
* and initialize the appropriate fields below.
|
|
|
817 |
*/
|
|
|
818 |
|
|
|
819 |
#if defined(PNG_gAMA_SUPPORTED) && defined(PNG_FLOATING_POINT_SUPPORTED)
|
|
|
820 |
/* The gAMA chunk describes the gamma characteristics of the system
|
|
|
821 |
* on which the image was created, normally in the range [1.0, 2.5].
|
|
|
822 |
* Data is valid if (valid & PNG_INFO_gAMA) is non-zero.
|
|
|
823 |
*/
|
|
|
824 |
float gamma; /* gamma value of image, if (valid & PNG_INFO_gAMA) */
|
|
|
825 |
#endif
|
|
|
826 |
|
|
|
827 |
#if defined(PNG_sRGB_SUPPORTED)
|
|
|
828 |
/* GR-P, 0.96a */
|
|
|
829 |
/* Data valid if (valid & PNG_INFO_sRGB) non-zero. */
|
|
|
830 |
png_byte srgb_intent; /* sRGB rendering intent [0, 1, 2, or 3] */
|
|
|
831 |
#endif
|
|
|
832 |
|
|
|
833 |
#if defined(PNG_TEXT_SUPPORTED)
|
|
|
834 |
/* The tEXt, and zTXt chunks contain human-readable textual data in
|
|
|
835 |
* uncompressed, compressed, and optionally compressed forms, respectively.
|
|
|
836 |
* The data in "text" is an array of pointers to uncompressed,
|
|
|
837 |
* null-terminated C strings. Each chunk has a keyword that describes the
|
|
|
838 |
* textual data contained in that chunk. Keywords are not required to be
|
|
|
839 |
* unique, and the text string may be empty. Any number of text chunks may
|
|
|
840 |
* be in an image.
|
|
|
841 |
*/
|
|
|
842 |
int num_text; /* number of comments read/to write */
|
|
|
843 |
int max_text; /* current size of text array */
|
|
|
844 |
png_textp text; /* array of comments read/to write */
|
|
|
845 |
#endif /* PNG_TEXT_SUPPORTED */
|
|
|
846 |
|
|
|
847 |
#if defined(PNG_tIME_SUPPORTED)
|
|
|
848 |
/* The tIME chunk holds the last time the displayed image data was
|
|
|
849 |
* modified. See the png_time struct for the contents of this struct.
|
|
|
850 |
*/
|
|
|
851 |
png_time mod_time;
|
|
|
852 |
#endif
|
|
|
853 |
|
|
|
854 |
#if defined(PNG_sBIT_SUPPORTED)
|
|
|
855 |
/* The sBIT chunk specifies the number of significant high-order bits
|
|
|
856 |
* in the pixel data. Values are in the range [1, bit_depth], and are
|
|
|
857 |
* only specified for the channels in the pixel data. The contents of
|
|
|
858 |
* the low-order bits is not specified. Data is valid if
|
|
|
859 |
* (valid & PNG_INFO_sBIT) is non-zero.
|
|
|
860 |
*/
|
|
|
861 |
png_color_8 sig_bit; /* significant bits in color channels */
|
|
|
862 |
#endif
|
|
|
863 |
|
|
|
864 |
#if defined(PNG_tRNS_SUPPORTED) || defined(PNG_READ_EXPAND_SUPPORTED) || \
|
|
|
865 |
defined(PNG_READ_BACKGROUND_SUPPORTED)
|
|
|
866 |
/* The tRNS chunk supplies transparency data for paletted images and
|
|
|
867 |
* other image types that don't need a full alpha channel. There are
|
|
|
868 |
* "num_trans" transparency values for a paletted image, stored in the
|
|
|
869 |
* same order as the palette colors, starting from index 0. Values
|
|
|
870 |
* for the data are in the range [0, 255], ranging from fully transparent
|
|
|
871 |
* to fully opaque, respectively. For non-paletted images, there is a
|
|
|
872 |
* single color specified that should be treated as fully transparent.
|
|
|
873 |
* Data is valid if (valid & PNG_INFO_tRNS) is non-zero.
|
|
|
874 |
*/
|
|
|
875 |
png_bytep trans; /* transparent values for paletted image */
|
|
|
876 |
png_color_16 trans_values; /* transparent color for non-palette image */
|
|
|
877 |
#endif
|
|
|
878 |
|
|
|
879 |
#if defined(PNG_bKGD_SUPPORTED) || defined(PNG_READ_BACKGROUND_SUPPORTED)
|
|
|
880 |
/* The bKGD chunk gives the suggested image background color if the
|
|
|
881 |
* display program does not have its own background color and the image
|
|
|
882 |
* is needs to composited onto a background before display. The colors
|
|
|
883 |
* in "background" are normally in the same color space/depth as the
|
|
|
884 |
* pixel data. Data is valid if (valid & PNG_INFO_bKGD) is non-zero.
|
|
|
885 |
*/
|
|
|
886 |
png_color_16 background;
|
|
|
887 |
#endif
|
|
|
888 |
|
|
|
889 |
#if defined(PNG_oFFs_SUPPORTED)
|
|
|
890 |
/* The oFFs chunk gives the offset in "offset_unit_type" units rightwards
|
|
|
891 |
* and downwards from the top-left corner of the display, page, or other
|
|
|
892 |
* application-specific co-ordinate space. See the PNG_OFFSET_ defines
|
|
|
893 |
* below for the unit types. Valid if (valid & PNG_INFO_oFFs) non-zero.
|
|
|
894 |
*/
|
|
|
895 |
png_int_32 x_offset; /* x offset on page */
|
|
|
896 |
png_int_32 y_offset; /* y offset on page */
|
|
|
897 |
png_byte offset_unit_type; /* offset units type */
|
|
|
898 |
#endif
|
|
|
899 |
|
|
|
900 |
#if defined(PNG_pHYs_SUPPORTED)
|
|
|
901 |
/* The pHYs chunk gives the physical pixel density of the image for
|
|
|
902 |
* display or printing in "phys_unit_type" units (see PNG_RESOLUTION_
|
|
|
903 |
* defines below). Data is valid if (valid & PNG_INFO_pHYs) is non-zero.
|
|
|
904 |
*/
|
|
|
905 |
png_uint_32 x_pixels_per_unit; /* horizontal pixel density */
|
|
|
906 |
png_uint_32 y_pixels_per_unit; /* vertical pixel density */
|
|
|
907 |
png_byte phys_unit_type; /* resolution type (see PNG_RESOLUTION_ below) */
|
|
|
908 |
#endif
|
|
|
909 |
|
|
|
910 |
#if defined(PNG_hIST_SUPPORTED)
|
|
|
911 |
/* The hIST chunk contains the relative frequency or importance of the
|
|
|
912 |
* various palette entries, so that a viewer can intelligently select a
|
|
|
913 |
* reduced-color palette, if required. Data is an array of "num_palette"
|
|
|
914 |
* values in the range [0,65535]. Data valid if (valid & PNG_INFO_hIST)
|
|
|
915 |
* is non-zero.
|
|
|
916 |
*/
|
|
|
917 |
png_uint_16p hist;
|
|
|
918 |
#endif
|
|
|
919 |
|
|
|
920 |
#ifdef PNG_cHRM_SUPPORTED
|
|
|
921 |
/* The cHRM chunk describes the CIE color characteristics of the monitor
|
|
|
922 |
* on which the PNG was created. This data allows the viewer to do gamut
|
|
|
923 |
* mapping of the input image to ensure that the viewer sees the same
|
|
|
924 |
* colors in the image as the creator. Values are in the range
|
|
|
925 |
* [0.0, 0.8]. Data valid if (valid & PNG_INFO_cHRM) non-zero.
|
|
|
926 |
*/
|
|
|
927 |
#ifdef PNG_FLOATING_POINT_SUPPORTED
|
|
|
928 |
float x_white;
|
|
|
929 |
float y_white;
|
|
|
930 |
float x_red;
|
|
|
931 |
float y_red;
|
|
|
932 |
float x_green;
|
|
|
933 |
float y_green;
|
|
|
934 |
float x_blue;
|
|
|
935 |
float y_blue;
|
|
|
936 |
#endif
|
|
|
937 |
#endif
|
|
|
938 |
|
|
|
939 |
#if defined(PNG_pCAL_SUPPORTED)
|
|
|
940 |
/* The pCAL chunk describes a transformation between the stored pixel
|
|
|
941 |
* values and original physical data values used to create the image.
|
|
|
942 |
* The integer range [0, 2^bit_depth - 1] maps to the floating-point
|
|
|
943 |
* range given by [pcal_X0, pcal_X1], and are further transformed by a
|
|
|
944 |
* (possibly non-linear) transformation function given by "pcal_type"
|
|
|
945 |
* and "pcal_params" into "pcal_units". Please see the PNG_EQUATION_
|
|
|
946 |
* defines below, and the PNG-Group's PNG extensions document for a
|
|
|
947 |
* complete description of the transformations and how they should be
|
|
|
948 |
* implemented, and for a description of the ASCII parameter strings.
|
|
|
949 |
* Data values are valid if (valid & PNG_INFO_pCAL) non-zero.
|
|
|
950 |
*/
|
|
|
951 |
png_charp pcal_purpose; /* pCAL chunk description string */
|
|
|
952 |
png_int_32 pcal_X0; /* minimum value */
|
|
|
953 |
png_int_32 pcal_X1; /* maximum value */
|
|
|
954 |
png_charp pcal_units; /* Latin-1 string giving physical units */
|
|
|
955 |
png_charpp pcal_params; /* ASCII strings containing parameter values */
|
|
|
956 |
png_byte pcal_type; /* equation type (see PNG_EQUATION_ below) */
|
|
|
957 |
png_byte pcal_nparams; /* number of parameters given in pcal_params */
|
|
|
958 |
#endif
|
|
|
959 |
|
|
|
960 |
/* New members added in libpng-1.0.6 */
|
|
|
961 |
#ifdef PNG_FREE_ME_SUPPORTED
|
|
|
962 |
png_uint_32 free_me; /* flags items libpng is responsible for freeing */
|
|
|
963 |
#endif
|
|
|
964 |
|
|
|
965 |
#if defined(PNG_UNKNOWN_CHUNKS_SUPPORTED) || \
|
|
|
966 |
defined(PNG_HANDLE_AS_UNKNOWN_SUPPORTED)
|
|
|
967 |
/* Storage for unknown chunks that the library doesn't recognize. */
|
|
|
968 |
png_unknown_chunkp unknown_chunks;
|
|
|
969 |
png_size_t unknown_chunks_num;
|
|
|
970 |
#endif
|
|
|
971 |
|
|
|
972 |
#if defined(PNG_iCCP_SUPPORTED)
|
|
|
973 |
/* iCCP chunk data. */
|
|
|
974 |
png_charp iccp_name; /* profile name */
|
|
|
975 |
png_charp iccp_profile; /* International Color Consortium profile data */
|
|
|
976 |
/* Note to maintainer: should be png_bytep */
|
|
|
977 |
png_uint_32 iccp_proflen; /* ICC profile data length */
|
|
|
978 |
png_byte iccp_compression; /* Always zero */
|
|
|
979 |
#endif
|
|
|
980 |
|
|
|
981 |
#if defined(PNG_sPLT_SUPPORTED)
|
|
|
982 |
/* Data on sPLT chunks (there may be more than one). */
|
|
|
983 |
png_sPLT_tp splt_palettes;
|
|
|
984 |
png_uint_32 splt_palettes_num;
|
|
|
985 |
#endif
|
|
|
986 |
|
|
|
987 |
#if defined(PNG_sCAL_SUPPORTED)
|
|
|
988 |
/* The sCAL chunk describes the actual physical dimensions of the
|
|
|
989 |
* subject matter of the graphic. The chunk contains a unit specification
|
|
|
990 |
* a byte value, and two ASCII strings representing floating-point
|
|
|
991 |
* values. The values are width and height corresponsing to one pixel
|
|
|
992 |
* in the image. This external representation is converted to double
|
|
|
993 |
* here. Data values are valid if (valid & PNG_INFO_sCAL) is non-zero.
|
|
|
994 |
*/
|
|
|
995 |
png_byte scal_unit; /* unit of physical scale */
|
|
|
996 |
#ifdef PNG_FLOATING_POINT_SUPPORTED
|
|
|
997 |
double scal_pixel_width; /* width of one pixel */
|
|
|
998 |
double scal_pixel_height; /* height of one pixel */
|
|
|
999 |
#endif
|
|
|
1000 |
#ifdef PNG_FIXED_POINT_SUPPORTED
|
|
|
1001 |
png_charp scal_s_width; /* string containing height */
|
|
|
1002 |
png_charp scal_s_height; /* string containing width */
|
|
|
1003 |
#endif
|
|
|
1004 |
#endif
|
|
|
1005 |
|
|
|
1006 |
#if defined(PNG_INFO_IMAGE_SUPPORTED)
|
|
|
1007 |
/* Memory has been allocated if (valid & PNG_ALLOCATED_INFO_ROWS) non-zero */
|
|
|
1008 |
/* Data valid if (valid & PNG_INFO_IDAT) non-zero */
|
|
|
1009 |
png_bytepp row_pointers; /* the image bits */
|
|
|
1010 |
#endif
|
|
|
1011 |
|
|
|
1012 |
#if defined(PNG_FIXED_POINT_SUPPORTED) && defined(PNG_gAMA_SUPPORTED)
|
|
|
1013 |
png_fixed_point int_gamma; /* gamma of image, if (valid & PNG_INFO_gAMA) */
|
|
|
1014 |
#endif
|
|
|
1015 |
|
|
|
1016 |
#if defined(PNG_cHRM_SUPPORTED) && defined(PNG_FIXED_POINT_SUPPORTED)
|
|
|
1017 |
png_fixed_point int_x_white;
|
|
|
1018 |
png_fixed_point int_y_white;
|
|
|
1019 |
png_fixed_point int_x_red;
|
|
|
1020 |
png_fixed_point int_y_red;
|
|
|
1021 |
png_fixed_point int_x_green;
|
|
|
1022 |
png_fixed_point int_y_green;
|
|
|
1023 |
png_fixed_point int_x_blue;
|
|
|
1024 |
png_fixed_point int_y_blue;
|
|
|
1025 |
#endif
|
|
|
1026 |
|
|
|
1027 |
} png_info;
|
|
|
1028 |
|
|
|
1029 |
typedef png_info FAR * png_infop;
|
|
|
1030 |
typedef png_info FAR * FAR * png_infopp;
|
|
|
1031 |
|
|
|
1032 |
/* Maximum positive integer used in PNG is (2^31)-1 */
|
|
|
1033 |
#define PNG_UINT_31_MAX ((png_uint_32)0x7fffffffL)
|
|
|
1034 |
#define PNG_UINT_32_MAX ((png_uint_32)(-1))
|
|
|
1035 |
#define PNG_SIZE_MAX ((png_size_t)(-1))
|
|
|
1036 |
#if defined(PNG_1_0_X) || defined (PNG_1_2_X)
|
|
|
1037 |
/* PNG_MAX_UINT is deprecated; use PNG_UINT_31_MAX instead. */
|
|
|
1038 |
#define PNG_MAX_UINT PNG_UINT_31_MAX
|
|
|
1039 |
#endif
|
|
|
1040 |
|
|
|
1041 |
/* These describe the color_type field in png_info. */
|
|
|
1042 |
/* color type masks */
|
|
|
1043 |
#define PNG_COLOR_MASK_PALETTE 1
|
|
|
1044 |
#define PNG_COLOR_MASK_COLOR 2
|
|
|
1045 |
#define PNG_COLOR_MASK_ALPHA 4
|
|
|
1046 |
|
|
|
1047 |
/* color types. Note that not all combinations are legal */
|
|
|
1048 |
#define PNG_COLOR_TYPE_GRAY 0
|
|
|
1049 |
#define PNG_COLOR_TYPE_PALETTE (PNG_COLOR_MASK_COLOR | PNG_COLOR_MASK_PALETTE)
|
|
|
1050 |
#define PNG_COLOR_TYPE_RGB (PNG_COLOR_MASK_COLOR)
|
|
|
1051 |
#define PNG_COLOR_TYPE_RGB_ALPHA (PNG_COLOR_MASK_COLOR | PNG_COLOR_MASK_ALPHA)
|
|
|
1052 |
#define PNG_COLOR_TYPE_GRAY_ALPHA (PNG_COLOR_MASK_ALPHA)
|
|
|
1053 |
/* aliases */
|
|
|
1054 |
#define PNG_COLOR_TYPE_RGBA PNG_COLOR_TYPE_RGB_ALPHA
|
|
|
1055 |
#define PNG_COLOR_TYPE_GA PNG_COLOR_TYPE_GRAY_ALPHA
|
|
|
1056 |
|
|
|
1057 |
/* This is for compression type. PNG 1.0-1.2 only define the single type. */
|
|
|
1058 |
#define PNG_COMPRESSION_TYPE_BASE 0 /* Deflate method 8, 32K window */
|
|
|
1059 |
#define PNG_COMPRESSION_TYPE_DEFAULT PNG_COMPRESSION_TYPE_BASE
|
|
|
1060 |
|
|
|
1061 |
/* This is for filter type. PNG 1.0-1.2 only define the single type. */
|
|
|
1062 |
#define PNG_FILTER_TYPE_BASE 0 /* Single row per-byte filtering */
|
|
|
1063 |
#define PNG_INTRAPIXEL_DIFFERENCING 64 /* Used only in MNG datastreams */
|
|
|
1064 |
#define PNG_FILTER_TYPE_DEFAULT PNG_FILTER_TYPE_BASE
|
|
|
1065 |
|
|
|
1066 |
/* These are for the interlacing type. These values should NOT be changed. */
|
|
|
1067 |
#define PNG_INTERLACE_NONE 0 /* Non-interlaced image */
|
|
|
1068 |
#define PNG_INTERLACE_ADAM7 1 /* Adam7 interlacing */
|
|
|
1069 |
#define PNG_INTERLACE_LAST 2 /* Not a valid value */
|
|
|
1070 |
|
|
|
1071 |
/* These are for the oFFs chunk. These values should NOT be changed. */
|
|
|
1072 |
#define PNG_OFFSET_PIXEL 0 /* Offset in pixels */
|
|
|
1073 |
#define PNG_OFFSET_MICROMETER 1 /* Offset in micrometers (1/10^6 meter) */
|
|
|
1074 |
#define PNG_OFFSET_LAST 2 /* Not a valid value */
|
|
|
1075 |
|
|
|
1076 |
/* These are for the pCAL chunk. These values should NOT be changed. */
|
|
|
1077 |
#define PNG_EQUATION_LINEAR 0 /* Linear transformation */
|
|
|
1078 |
#define PNG_EQUATION_BASE_E 1 /* Exponential base e transform */
|
|
|
1079 |
#define PNG_EQUATION_ARBITRARY 2 /* Arbitrary base exponential transform */
|
|
|
1080 |
#define PNG_EQUATION_HYPERBOLIC 3 /* Hyperbolic sine transformation */
|
|
|
1081 |
#define PNG_EQUATION_LAST 4 /* Not a valid value */
|
|
|
1082 |
|
|
|
1083 |
/* These are for the sCAL chunk. These values should NOT be changed. */
|
|
|
1084 |
#define PNG_SCALE_UNKNOWN 0 /* unknown unit (image scale) */
|
|
|
1085 |
#define PNG_SCALE_METER 1 /* meters per pixel */
|
|
|
1086 |
#define PNG_SCALE_RADIAN 2 /* radians per pixel */
|
|
|
1087 |
#define PNG_SCALE_LAST 3 /* Not a valid value */
|
|
|
1088 |
|
|
|
1089 |
/* These are for the pHYs chunk. These values should NOT be changed. */
|
|
|
1090 |
#define PNG_RESOLUTION_UNKNOWN 0 /* pixels/unknown unit (aspect ratio) */
|
|
|
1091 |
#define PNG_RESOLUTION_METER 1 /* pixels/meter */
|
|
|
1092 |
#define PNG_RESOLUTION_LAST 2 /* Not a valid value */
|
|
|
1093 |
|
|
|
1094 |
/* These are for the sRGB chunk. These values should NOT be changed. */
|
|
|
1095 |
#define PNG_sRGB_INTENT_PERCEPTUAL 0
|
|
|
1096 |
#define PNG_sRGB_INTENT_RELATIVE 1
|
|
|
1097 |
#define PNG_sRGB_INTENT_SATURATION 2
|
|
|
1098 |
#define PNG_sRGB_INTENT_ABSOLUTE 3
|
|
|
1099 |
#define PNG_sRGB_INTENT_LAST 4 /* Not a valid value */
|
|
|
1100 |
|
|
|
1101 |
/* This is for text chunks */
|
|
|
1102 |
#define PNG_KEYWORD_MAX_LENGTH 79
|
|
|
1103 |
|
|
|
1104 |
/* Maximum number of entries in PLTE/sPLT/tRNS arrays */
|
|
|
1105 |
#define PNG_MAX_PALETTE_LENGTH 256
|
|
|
1106 |
|
|
|
1107 |
/* These determine if an ancillary chunk's data has been successfully read
|
|
|
1108 |
* from the PNG header, or if the application has filled in the corresponding
|
|
|
1109 |
* data in the info_struct to be written into the output file. The values
|
|
|
1110 |
* of the PNG_INFO_<chunk> defines should NOT be changed.
|
|
|
1111 |
*/
|
|
|
1112 |
#define PNG_INFO_gAMA 0x0001
|
|
|
1113 |
#define PNG_INFO_sBIT 0x0002
|
|
|
1114 |
#define PNG_INFO_cHRM 0x0004
|
|
|
1115 |
#define PNG_INFO_PLTE 0x0008
|
|
|
1116 |
#define PNG_INFO_tRNS 0x0010
|
|
|
1117 |
#define PNG_INFO_bKGD 0x0020
|
|
|
1118 |
#define PNG_INFO_hIST 0x0040
|
|
|
1119 |
#define PNG_INFO_pHYs 0x0080
|
|
|
1120 |
#define PNG_INFO_oFFs 0x0100
|
|
|
1121 |
#define PNG_INFO_tIME 0x0200
|
|
|
1122 |
#define PNG_INFO_pCAL 0x0400
|
|
|
1123 |
#define PNG_INFO_sRGB 0x0800 /* GR-P, 0.96a */
|
|
|
1124 |
#define PNG_INFO_iCCP 0x1000 /* ESR, 1.0.6 */
|
|
|
1125 |
#define PNG_INFO_sPLT 0x2000 /* ESR, 1.0.6 */
|
|
|
1126 |
#define PNG_INFO_sCAL 0x4000 /* ESR, 1.0.6 */
|
|
|
1127 |
#define PNG_INFO_IDAT 0x8000L /* ESR, 1.0.6 */
|
|
|
1128 |
|
|
|
1129 |
/* This is used for the transformation routines, as some of them
|
|
|
1130 |
* change these values for the row. It also should enable using
|
|
|
1131 |
* the routines for other purposes.
|
|
|
1132 |
*/
|
|
|
1133 |
typedef struct png_row_info_struct
|
|
|
1134 |
{
|
|
|
1135 |
png_uint_32 width; /* width of row */
|
|
|
1136 |
png_uint_32 rowbytes; /* number of bytes in row */
|
|
|
1137 |
png_byte color_type; /* color type of row */
|
|
|
1138 |
png_byte bit_depth; /* bit depth of row */
|
|
|
1139 |
png_byte channels; /* number of channels (1, 2, 3, or 4) */
|
|
|
1140 |
png_byte pixel_depth; /* bits per pixel (depth * channels) */
|
|
|
1141 |
} png_row_info;
|
|
|
1142 |
|
|
|
1143 |
typedef png_row_info FAR * png_row_infop;
|
|
|
1144 |
typedef png_row_info FAR * FAR * png_row_infopp;
|
|
|
1145 |
|
|
|
1146 |
/* These are the function types for the I/O functions and for the functions
|
|
|
1147 |
* that allow the user to override the default I/O functions with his or her
|
|
|
1148 |
* own. The png_error_ptr type should match that of user-supplied warning
|
|
|
1149 |
* and error functions, while the png_rw_ptr type should match that of the
|
|
|
1150 |
* user read/write data functions.
|
|
|
1151 |
*/
|
|
|
1152 |
typedef struct png_struct_def png_struct;
|
|
|
1153 |
typedef png_struct FAR * png_structp;
|
|
|
1154 |
|
|
|
1155 |
typedef void (PNGAPI *png_error_ptr) PNGARG((png_structp, png_const_charp));
|
|
|
1156 |
typedef void (PNGAPI *png_rw_ptr) PNGARG((png_structp, png_bytep, png_size_t));
|
|
|
1157 |
typedef void (PNGAPI *png_flush_ptr) PNGARG((png_structp));
|
|
|
1158 |
typedef void (PNGAPI *png_read_status_ptr) PNGARG((png_structp, png_uint_32,
|
|
|
1159 |
int));
|
|
|
1160 |
typedef void (PNGAPI *png_write_status_ptr) PNGARG((png_structp, png_uint_32,
|
|
|
1161 |
int));
|
|
|
1162 |
|
|
|
1163 |
#ifdef PNG_PROGRESSIVE_READ_SUPPORTED
|
|
|
1164 |
typedef void (PNGAPI *png_progressive_info_ptr) PNGARG((png_structp, png_infop));
|
|
|
1165 |
typedef void (PNGAPI *png_progressive_end_ptr) PNGARG((png_structp, png_infop));
|
|
|
1166 |
typedef void (PNGAPI *png_progressive_row_ptr) PNGARG((png_structp, png_bytep,
|
|
|
1167 |
png_uint_32, int));
|
|
|
1168 |
#endif
|
|
|
1169 |
|
|
|
1170 |
#if defined(PNG_READ_USER_TRANSFORM_SUPPORTED) || \
|
|
|
1171 |
defined(PNG_WRITE_USER_TRANSFORM_SUPPORTED) || \
|
|
|
1172 |
defined(PNG_LEGACY_SUPPORTED)
|
|
|
1173 |
typedef void (PNGAPI *png_user_transform_ptr) PNGARG((png_structp,
|
|
|
1174 |
png_row_infop, png_bytep));
|
|
|
1175 |
#endif
|
|
|
1176 |
|
|
|
1177 |
#if defined(PNG_USER_CHUNKS_SUPPORTED)
|
|
|
1178 |
typedef int (PNGAPI *png_user_chunk_ptr) PNGARG((png_structp, png_unknown_chunkp));
|
|
|
1179 |
#endif
|
|
|
1180 |
#if defined(PNG_UNKNOWN_CHUNKS_SUPPORTED)
|
|
|
1181 |
typedef void (PNGAPI *png_unknown_chunk_ptr) PNGARG((png_structp));
|
|
|
1182 |
#endif
|
|
|
1183 |
|
|
|
1184 |
/* Transform masks for the high-level interface */
|
|
|
1185 |
#define PNG_TRANSFORM_IDENTITY 0x0000 /* read and write */
|
|
|
1186 |
#define PNG_TRANSFORM_STRIP_16 0x0001 /* read only */
|
|
|
1187 |
#define PNG_TRANSFORM_STRIP_ALPHA 0x0002 /* read only */
|
|
|
1188 |
#define PNG_TRANSFORM_PACKING 0x0004 /* read and write */
|
|
|
1189 |
#define PNG_TRANSFORM_PACKSWAP 0x0008 /* read and write */
|
|
|
1190 |
#define PNG_TRANSFORM_EXPAND 0x0010 /* read only */
|
|
|
1191 |
#define PNG_TRANSFORM_INVERT_MONO 0x0020 /* read and write */
|
|
|
1192 |
#define PNG_TRANSFORM_SHIFT 0x0040 /* read and write */
|
|
|
1193 |
#define PNG_TRANSFORM_BGR 0x0080 /* read and write */
|
|
|
1194 |
#define PNG_TRANSFORM_SWAP_ALPHA 0x0100 /* read and write */
|
|
|
1195 |
#define PNG_TRANSFORM_SWAP_ENDIAN 0x0200 /* read and write */
|
|
|
1196 |
#define PNG_TRANSFORM_INVERT_ALPHA 0x0400 /* read and write */
|
|
|
1197 |
#define PNG_TRANSFORM_STRIP_FILLER 0x0800 /* write only, deprecated */
|
|
|
1198 |
/* Added to libpng-1.2.34 */
|
|
|
1199 |
#define PNG_TRANSFORM_STRIP_FILLER_BEFORE 0x0800 /* write only */
|
|
|
1200 |
#define PNG_TRANSFORM_STRIP_FILLER_AFTER 0x1000 /* write only */
|
|
|
1201 |
|
|
|
1202 |
/* Flags for MNG supported features */
|
|
|
1203 |
#define PNG_FLAG_MNG_EMPTY_PLTE 0x01
|
|
|
1204 |
#define PNG_FLAG_MNG_FILTER_64 0x04
|
|
|
1205 |
#define PNG_ALL_MNG_FEATURES 0x05
|
|
|
1206 |
|
|
|
1207 |
typedef png_voidp (*png_malloc_ptr) PNGARG((png_structp, png_size_t));
|
|
|
1208 |
typedef void (*png_free_ptr) PNGARG((png_structp, png_voidp));
|
|
|
1209 |
|
|
|
1210 |
/* The structure that holds the information to read and write PNG files.
|
|
|
1211 |
* The only people who need to care about what is inside of this are the
|
|
|
1212 |
* people who will be modifying the library for their own special needs.
|
|
|
1213 |
* It should NOT be accessed directly by an application, except to store
|
|
|
1214 |
* the jmp_buf.
|
|
|
1215 |
*/
|
|
|
1216 |
|
|
|
1217 |
struct png_struct_def
|
|
|
1218 |
{
|
|
|
1219 |
#ifdef PNG_SETJMP_SUPPORTED
|
|
|
1220 |
jmp_buf jmpbuf; /* used in png_error */
|
|
|
1221 |
#endif
|
|
|
1222 |
png_error_ptr error_fn; /* function for printing errors and aborting */
|
|
|
1223 |
png_error_ptr warning_fn; /* function for printing warnings */
|
|
|
1224 |
png_voidp error_ptr; /* user supplied struct for error functions */
|
|
|
1225 |
png_rw_ptr write_data_fn; /* function for writing output data */
|
|
|
1226 |
png_rw_ptr read_data_fn; /* function for reading input data */
|
|
|
1227 |
png_voidp io_ptr; /* ptr to application struct for I/O functions */
|
|
|
1228 |
|
|
|
1229 |
#if defined(PNG_READ_USER_TRANSFORM_SUPPORTED)
|
|
|
1230 |
png_user_transform_ptr read_user_transform_fn; /* user read transform */
|
|
|
1231 |
#endif
|
|
|
1232 |
|
|
|
1233 |
#if defined(PNG_WRITE_USER_TRANSFORM_SUPPORTED)
|
|
|
1234 |
png_user_transform_ptr write_user_transform_fn; /* user write transform */
|
|
|
1235 |
#endif
|
|
|
1236 |
|
|
|
1237 |
/* These were added in libpng-1.0.2 */
|
|
|
1238 |
#if defined(PNG_USER_TRANSFORM_PTR_SUPPORTED)
|
|
|
1239 |
#if defined(PNG_READ_USER_TRANSFORM_SUPPORTED) || \
|
|
|
1240 |
defined(PNG_WRITE_USER_TRANSFORM_SUPPORTED)
|
|
|
1241 |
png_voidp user_transform_ptr; /* user supplied struct for user transform */
|
|
|
1242 |
png_byte user_transform_depth; /* bit depth of user transformed pixels */
|
|
|
1243 |
png_byte user_transform_channels; /* channels in user transformed pixels */
|
|
|
1244 |
#endif
|
|
|
1245 |
#endif
|
|
|
1246 |
|
|
|
1247 |
png_uint_32 mode; /* tells us where we are in the PNG file */
|
|
|
1248 |
png_uint_32 flags; /* flags indicating various things to libpng */
|
|
|
1249 |
png_uint_32 transformations; /* which transformations to perform */
|
|
|
1250 |
|
|
|
1251 |
z_stream zstream; /* pointer to decompression structure (below) */
|
|
|
1252 |
png_bytep zbuf; /* buffer for zlib */
|
|
|
1253 |
png_size_t zbuf_size; /* size of zbuf */
|
|
|
1254 |
int zlib_level; /* holds zlib compression level */
|
|
|
1255 |
int zlib_method; /* holds zlib compression method */
|
|
|
1256 |
int zlib_window_bits; /* holds zlib compression window bits */
|
|
|
1257 |
int zlib_mem_level; /* holds zlib compression memory level */
|
|
|
1258 |
int zlib_strategy; /* holds zlib compression strategy */
|
|
|
1259 |
|
|
|
1260 |
png_uint_32 width; /* width of image in pixels */
|
|
|
1261 |
png_uint_32 height; /* height of image in pixels */
|
|
|
1262 |
png_uint_32 num_rows; /* number of rows in current pass */
|
|
|
1263 |
png_uint_32 usr_width; /* width of row at start of write */
|
|
|
1264 |
png_uint_32 rowbytes; /* size of row in bytes */
|
|
|
1265 |
png_uint_32 irowbytes; /* size of current interlaced row in bytes */
|
|
|
1266 |
png_uint_32 iwidth; /* width of current interlaced row in pixels */
|
|
|
1267 |
png_uint_32 row_number; /* current row in interlace pass */
|
|
|
1268 |
png_bytep prev_row; /* buffer to save previous (unfiltered) row */
|
|
|
1269 |
png_bytep row_buf; /* buffer to save current (unfiltered) row */
|
|
|
1270 |
#ifndef PNG_NO_WRITE_FILTER
|
|
|
1271 |
png_bytep sub_row; /* buffer to save "sub" row when filtering */
|
|
|
1272 |
png_bytep up_row; /* buffer to save "up" row when filtering */
|
|
|
1273 |
png_bytep avg_row; /* buffer to save "avg" row when filtering */
|
|
|
1274 |
png_bytep paeth_row; /* buffer to save "Paeth" row when filtering */
|
|
|
1275 |
#endif
|
|
|
1276 |
png_row_info row_info; /* used for transformation routines */
|
|
|
1277 |
|
|
|
1278 |
png_uint_32 idat_size; /* current IDAT size for read */
|
|
|
1279 |
png_uint_32 crc; /* current chunk CRC value */
|
|
|
1280 |
png_colorp palette; /* palette from the input file */
|
|
|
1281 |
png_uint_16 num_palette; /* number of color entries in palette */
|
|
|
1282 |
png_uint_16 num_trans; /* number of transparency values */
|
|
|
1283 |
png_byte chunk_name[5]; /* null-terminated name of current chunk */
|
|
|
1284 |
png_byte compression; /* file compression type (always 0) */
|
|
|
1285 |
png_byte filter; /* file filter type (always 0) */
|
|
|
1286 |
png_byte interlaced; /* PNG_INTERLACE_NONE, PNG_INTERLACE_ADAM7 */
|
|
|
1287 |
png_byte pass; /* current interlace pass (0 - 6) */
|
|
|
1288 |
png_byte do_filter; /* row filter flags (see PNG_FILTER_ below ) */
|
|
|
1289 |
png_byte color_type; /* color type of file */
|
|
|
1290 |
png_byte bit_depth; /* bit depth of file */
|
|
|
1291 |
png_byte usr_bit_depth; /* bit depth of users row */
|
|
|
1292 |
png_byte pixel_depth; /* number of bits per pixel */
|
|
|
1293 |
png_byte channels; /* number of channels in file */
|
|
|
1294 |
png_byte usr_channels; /* channels at start of write */
|
|
|
1295 |
png_byte sig_bytes; /* magic bytes read/written from start of file */
|
|
|
1296 |
|
|
|
1297 |
#if defined(PNG_READ_FILLER_SUPPORTED) || defined(PNG_WRITE_FILLER_SUPPORTED)
|
|
|
1298 |
#ifdef PNG_LEGACY_SUPPORTED
|
|
|
1299 |
png_byte filler; /* filler byte for pixel expansion */
|
|
|
1300 |
#else
|
|
|
1301 |
png_uint_16 filler; /* filler bytes for pixel expansion */
|
|
|
1302 |
#endif
|
|
|
1303 |
#endif
|
|
|
1304 |
|
|
|
1305 |
#if defined(PNG_bKGD_SUPPORTED)
|
|
|
1306 |
png_byte background_gamma_type;
|
|
|
1307 |
# ifdef PNG_FLOATING_POINT_SUPPORTED
|
|
|
1308 |
float background_gamma;
|
|
|
1309 |
# endif
|
|
|
1310 |
png_color_16 background; /* background color in screen gamma space */
|
|
|
1311 |
#if defined(PNG_READ_GAMMA_SUPPORTED)
|
|
|
1312 |
png_color_16 background_1; /* background normalized to gamma 1.0 */
|
|
|
1313 |
#endif
|
|
|
1314 |
#endif /* PNG_bKGD_SUPPORTED */
|
|
|
1315 |
|
|
|
1316 |
#if defined(PNG_WRITE_FLUSH_SUPPORTED)
|
|
|
1317 |
png_flush_ptr output_flush_fn; /* Function for flushing output */
|
|
|
1318 |
png_uint_32 flush_dist; /* how many rows apart to flush, 0 - no flush */
|
|
|
1319 |
png_uint_32 flush_rows; /* number of rows written since last flush */
|
|
|
1320 |
#endif
|
|
|
1321 |
|
|
|
1322 |
#if defined(PNG_READ_GAMMA_SUPPORTED) || defined(PNG_READ_BACKGROUND_SUPPORTED)
|
|
|
1323 |
int gamma_shift; /* number of "insignificant" bits 16-bit gamma */
|
|
|
1324 |
#ifdef PNG_FLOATING_POINT_SUPPORTED
|
|
|
1325 |
float gamma; /* file gamma value */
|
|
|
1326 |
float screen_gamma; /* screen gamma value (display_exponent) */
|
|
|
1327 |
#endif
|
|
|
1328 |
#endif
|
|
|
1329 |
|
|
|
1330 |
#if defined(PNG_READ_GAMMA_SUPPORTED) || defined(PNG_READ_BACKGROUND_SUPPORTED)
|
|
|
1331 |
png_bytep gamma_table; /* gamma table for 8-bit depth files */
|
|
|
1332 |
png_bytep gamma_from_1; /* converts from 1.0 to screen */
|
|
|
1333 |
png_bytep gamma_to_1; /* converts from file to 1.0 */
|
|
|
1334 |
png_uint_16pp gamma_16_table; /* gamma table for 16-bit depth files */
|
|
|
1335 |
png_uint_16pp gamma_16_from_1; /* converts from 1.0 to screen */
|
|
|
1336 |
png_uint_16pp gamma_16_to_1; /* converts from file to 1.0 */
|
|
|
1337 |
#endif
|
|
|
1338 |
|
|
|
1339 |
#if defined(PNG_READ_GAMMA_SUPPORTED) || defined(PNG_sBIT_SUPPORTED)
|
|
|
1340 |
png_color_8 sig_bit; /* significant bits in each available channel */
|
|
|
1341 |
#endif
|
|
|
1342 |
|
|
|
1343 |
#if defined(PNG_READ_SHIFT_SUPPORTED) || defined(PNG_WRITE_SHIFT_SUPPORTED)
|
|
|
1344 |
png_color_8 shift; /* shift for significant bit tranformation */
|
|
|
1345 |
#endif
|
|
|
1346 |
|
|
|
1347 |
#if defined(PNG_tRNS_SUPPORTED) || defined(PNG_READ_BACKGROUND_SUPPORTED) \
|
|
|
1348 |
|| defined(PNG_READ_EXPAND_SUPPORTED) || defined(PNG_READ_BACKGROUND_SUPPORTED)
|
|
|
1349 |
png_bytep trans; /* transparency values for paletted files */
|
|
|
1350 |
png_color_16 trans_values; /* transparency values for non-paletted files */
|
|
|
1351 |
#endif
|
|
|
1352 |
|
|
|
1353 |
png_read_status_ptr read_row_fn; /* called after each row is decoded */
|
|
|
1354 |
png_write_status_ptr write_row_fn; /* called after each row is encoded */
|
|
|
1355 |
#ifdef PNG_PROGRESSIVE_READ_SUPPORTED
|
|
|
1356 |
png_progressive_info_ptr info_fn; /* called after header data fully read */
|
|
|
1357 |
png_progressive_row_ptr row_fn; /* called after each prog. row is decoded */
|
|
|
1358 |
png_progressive_end_ptr end_fn; /* called after image is complete */
|
|
|
1359 |
png_bytep save_buffer_ptr; /* current location in save_buffer */
|
|
|
1360 |
png_bytep save_buffer; /* buffer for previously read data */
|
|
|
1361 |
png_bytep current_buffer_ptr; /* current location in current_buffer */
|
|
|
1362 |
png_bytep current_buffer; /* buffer for recently used data */
|
|
|
1363 |
png_uint_32 push_length; /* size of current input chunk */
|
|
|
1364 |
png_uint_32 skip_length; /* bytes to skip in input data */
|
|
|
1365 |
png_size_t save_buffer_size; /* amount of data now in save_buffer */
|
|
|
1366 |
png_size_t save_buffer_max; /* total size of save_buffer */
|
|
|
1367 |
png_size_t buffer_size; /* total amount of available input data */
|
|
|
1368 |
png_size_t current_buffer_size; /* amount of data now in current_buffer */
|
|
|
1369 |
int process_mode; /* what push library is currently doing */
|
|
|
1370 |
int cur_palette; /* current push library palette index */
|
|
|
1371 |
|
|
|
1372 |
# if defined(PNG_TEXT_SUPPORTED)
|
|
|
1373 |
png_size_t current_text_size; /* current size of text input data */
|
|
|
1374 |
png_size_t current_text_left; /* how much text left to read in input */
|
|
|
1375 |
png_charp current_text; /* current text chunk buffer */
|
|
|
1376 |
png_charp current_text_ptr; /* current location in current_text */
|
|
|
1377 |
# endif /* PNG_TEXT_SUPPORTED */
|
|
|
1378 |
#endif /* PNG_PROGRESSIVE_READ_SUPPORTED */
|
|
|
1379 |
|
|
|
1380 |
#if defined(__TURBOC__) && !defined(_Windows) && !defined(__FLAT__)
|
|
|
1381 |
/* for the Borland special 64K segment handler */
|
|
|
1382 |
png_bytepp offset_table_ptr;
|
|
|
1383 |
png_bytep offset_table;
|
|
|
1384 |
png_uint_16 offset_table_number;
|
|
|
1385 |
png_uint_16 offset_table_count;
|
|
|
1386 |
png_uint_16 offset_table_count_free;
|
|
|
1387 |
#endif
|
|
|
1388 |
|
|
|
1389 |
#if defined(PNG_READ_DITHER_SUPPORTED)
|
|
|
1390 |
png_bytep palette_lookup; /* lookup table for dithering */
|
|
|
1391 |
png_bytep dither_index; /* index translation for palette files */
|
|
|
1392 |
#endif
|
|
|
1393 |
|
|
|
1394 |
#if defined(PNG_READ_DITHER_SUPPORTED) || defined(PNG_hIST_SUPPORTED)
|
|
|
1395 |
png_uint_16p hist; /* histogram */
|
|
|
1396 |
#endif
|
|
|
1397 |
|
|
|
1398 |
#if defined(PNG_WRITE_WEIGHTED_FILTER_SUPPORTED)
|
|
|
1399 |
png_byte heuristic_method; /* heuristic for row filter selection */
|
|
|
1400 |
png_byte num_prev_filters; /* number of weights for previous rows */
|
|
|
1401 |
png_bytep prev_filters; /* filter type(s) of previous row(s) */
|
|
|
1402 |
png_uint_16p filter_weights; /* weight(s) for previous line(s) */
|
|
|
1403 |
png_uint_16p inv_filter_weights; /* 1/weight(s) for previous line(s) */
|
|
|
1404 |
png_uint_16p filter_costs; /* relative filter calculation cost */
|
|
|
1405 |
png_uint_16p inv_filter_costs; /* 1/relative filter calculation cost */
|
|
|
1406 |
#endif
|
|
|
1407 |
|
|
|
1408 |
#if defined(PNG_TIME_RFC1123_SUPPORTED)
|
|
|
1409 |
png_charp time_buffer; /* String to hold RFC 1123 time text */
|
|
|
1410 |
#endif
|
|
|
1411 |
|
|
|
1412 |
/* New members added in libpng-1.0.6 */
|
|
|
1413 |
|
|
|
1414 |
#ifdef PNG_FREE_ME_SUPPORTED
|
|
|
1415 |
png_uint_32 free_me; /* flags items libpng is responsible for freeing */
|
|
|
1416 |
#endif
|
|
|
1417 |
|
|
|
1418 |
#if defined(PNG_USER_CHUNKS_SUPPORTED)
|
|
|
1419 |
png_voidp user_chunk_ptr;
|
|
|
1420 |
png_user_chunk_ptr read_user_chunk_fn; /* user read chunk handler */
|
|
|
1421 |
#endif
|
|
|
1422 |
|
|
|
1423 |
#ifdef PNG_HANDLE_AS_UNKNOWN_SUPPORTED
|
|
|
1424 |
int num_chunk_list;
|
|
|
1425 |
png_bytep chunk_list;
|
|
|
1426 |
#endif
|
|
|
1427 |
|
|
|
1428 |
/* New members added in libpng-1.0.3 */
|
|
|
1429 |
#if defined(PNG_READ_RGB_TO_GRAY_SUPPORTED)
|
|
|
1430 |
png_byte rgb_to_gray_status;
|
|
|
1431 |
/* These were changed from png_byte in libpng-1.0.6 */
|
|
|
1432 |
png_uint_16 rgb_to_gray_red_coeff;
|
|
|
1433 |
png_uint_16 rgb_to_gray_green_coeff;
|
|
|
1434 |
png_uint_16 rgb_to_gray_blue_coeff;
|
|
|
1435 |
#endif
|
|
|
1436 |
|
|
|
1437 |
/* New member added in libpng-1.0.4 (renamed in 1.0.9) */
|
|
|
1438 |
#if defined(PNG_MNG_FEATURES_SUPPORTED) || \
|
|
|
1439 |
defined(PNG_READ_EMPTY_PLTE_SUPPORTED) || \
|
|
|
1440 |
defined(PNG_WRITE_EMPTY_PLTE_SUPPORTED)
|
|
|
1441 |
/* Changed from png_byte to png_uint_32 at version 1.2.0 */
|
|
|
1442 |
#ifdef PNG_1_0_X
|
|
|
1443 |
png_byte mng_features_permitted;
|
|
|
1444 |
#else
|
|
|
1445 |
png_uint_32 mng_features_permitted;
|
|
|
1446 |
#endif /* PNG_1_0_X */
|
|
|
1447 |
#endif
|
|
|
1448 |
|
|
|
1449 |
/* New member added in libpng-1.0.7 */
|
|
|
1450 |
#if defined(PNG_READ_GAMMA_SUPPORTED) || defined(PNG_READ_BACKGROUND_SUPPORTED)
|
|
|
1451 |
png_fixed_point int_gamma;
|
|
|
1452 |
#endif
|
|
|
1453 |
|
|
|
1454 |
/* New member added in libpng-1.0.9, ifdef'ed out in 1.0.12, enabled in 1.2.0 */
|
|
|
1455 |
#if defined(PNG_MNG_FEATURES_SUPPORTED)
|
|
|
1456 |
png_byte filter_type;
|
|
|
1457 |
#endif
|
|
|
1458 |
|
|
|
1459 |
#if defined(PNG_1_0_X)
|
|
|
1460 |
/* New member added in libpng-1.0.10, ifdef'ed out in 1.2.0 */
|
|
|
1461 |
png_uint_32 row_buf_size;
|
|
|
1462 |
#endif
|
|
|
1463 |
|
|
|
1464 |
/* New members added in libpng-1.2.0 */
|
|
|
1465 |
#if defined(PNG_ASSEMBLER_CODE_SUPPORTED)
|
|
|
1466 |
# if !defined(PNG_1_0_X)
|
|
|
1467 |
# if defined(PNG_MMX_CODE_SUPPORTED)
|
|
|
1468 |
png_byte mmx_bitdepth_threshold;
|
|
|
1469 |
png_uint_32 mmx_rowbytes_threshold;
|
|
|
1470 |
# endif
|
|
|
1471 |
png_uint_32 asm_flags;
|
|
|
1472 |
# endif
|
|
|
1473 |
#endif
|
|
|
1474 |
|
|
|
1475 |
/* New members added in libpng-1.0.2 but first enabled by default in 1.2.0 */
|
|
|
1476 |
#ifdef PNG_USER_MEM_SUPPORTED
|
|
|
1477 |
png_voidp mem_ptr; /* user supplied struct for mem functions */
|
|
|
1478 |
png_malloc_ptr malloc_fn; /* function for allocating memory */
|
|
|
1479 |
png_free_ptr free_fn; /* function for freeing memory */
|
|
|
1480 |
#endif
|
|
|
1481 |
|
|
|
1482 |
/* New member added in libpng-1.0.13 and 1.2.0 */
|
|
|
1483 |
png_bytep big_row_buf; /* buffer to save current (unfiltered) row */
|
|
|
1484 |
|
|
|
1485 |
#if defined(PNG_READ_DITHER_SUPPORTED)
|
|
|
1486 |
/* The following three members were added at version 1.0.14 and 1.2.4 */
|
|
|
1487 |
png_bytep dither_sort; /* working sort array */
|
|
|
1488 |
png_bytep index_to_palette; /* where the original index currently is */
|
|
|
1489 |
/* in the palette */
|
|
|
1490 |
png_bytep palette_to_index; /* which original index points to this */
|
|
|
1491 |
/* palette color */
|
|
|
1492 |
#endif
|
|
|
1493 |
|
|
|
1494 |
/* New members added in libpng-1.0.16 and 1.2.6 */
|
|
|
1495 |
png_byte compression_type;
|
|
|
1496 |
|
|
|
1497 |
#ifdef PNG_SET_USER_LIMITS_SUPPORTED
|
|
|
1498 |
png_uint_32 user_width_max;
|
|
|
1499 |
png_uint_32 user_height_max;
|
|
|
1500 |
#endif
|
|
|
1501 |
|
|
|
1502 |
/* New member added in libpng-1.0.25 and 1.2.17 */
|
|
|
1503 |
#if defined(PNG_UNKNOWN_CHUNKS_SUPPORTED)
|
|
|
1504 |
/* Storage for unknown chunk that the library doesn't recognize. */
|
|
|
1505 |
png_unknown_chunk unknown_chunk;
|
|
|
1506 |
#endif
|
|
|
1507 |
|
|
|
1508 |
/* New members added in libpng-1.2.26 */
|
|
|
1509 |
png_uint_32 old_big_row_buf_size, old_prev_row_size;
|
|
|
1510 |
|
|
|
1511 |
/* New member added in libpng-1.2.30 */
|
|
|
1512 |
png_charp chunkdata; /* buffer for reading chunk data */
|
|
|
1513 |
|
|
|
1514 |
};
|
|
|
1515 |
|
|
|
1516 |
|
|
|
1517 |
/* This triggers a compiler error in png.c, if png.c and png.h
|
|
|
1518 |
* do not agree upon the version number.
|
|
|
1519 |
*/
|
|
|
1520 |
typedef png_structp version_1_2_40;
|
|
|
1521 |
|
|
|
1522 |
typedef png_struct FAR * FAR * png_structpp;
|
|
|
1523 |
|
|
|
1524 |
/* Here are the function definitions most commonly used. This is not
|
|
|
1525 |
* the place to find out how to use libpng. See libpng.txt for the
|
|
|
1526 |
* full explanation, see example.c for the summary. This just provides
|
|
|
1527 |
* a simple one line description of the use of each function.
|
|
|
1528 |
*/
|
|
|
1529 |
|
|
|
1530 |
/* Returns the version number of the library */
|
|
|
1531 |
extern PNG_EXPORT(png_uint_32,png_access_version_number) PNGARG((void));
|
|
|
1532 |
|
|
|
1533 |
/* Tell lib we have already handled the first <num_bytes> magic bytes.
|
|
|
1534 |
* Handling more than 8 bytes from the beginning of the file is an error.
|
|
|
1535 |
*/
|
|
|
1536 |
extern PNG_EXPORT(void,png_set_sig_bytes) PNGARG((png_structp png_ptr,
|
|
|
1537 |
int num_bytes));
|
|
|
1538 |
|
|
|
1539 |
/* Check sig[start] through sig[start + num_to_check - 1] to see if it's a
|
|
|
1540 |
* PNG file. Returns zero if the supplied bytes match the 8-byte PNG
|
|
|
1541 |
* signature, and non-zero otherwise. Having num_to_check == 0 or
|
|
|
1542 |
* start > 7 will always fail (ie return non-zero).
|
|
|
1543 |
*/
|
|
|
1544 |
extern PNG_EXPORT(int,png_sig_cmp) PNGARG((png_bytep sig, png_size_t start,
|
|
|
1545 |
png_size_t num_to_check));
|
|
|
1546 |
|
|
|
1547 |
/* Simple signature checking function. This is the same as calling
|
|
|
1548 |
* png_check_sig(sig, n) := !png_sig_cmp(sig, 0, n).
|
|
|
1549 |
*/
|
|
|
1550 |
extern PNG_EXPORT(int,png_check_sig) PNGARG((png_bytep sig, int num));
|
|
|
1551 |
|
|
|
1552 |
/* Allocate and initialize png_ptr struct for reading, and any other memory. */
|
|
|
1553 |
extern PNG_EXPORT(png_structp,png_create_read_struct)
|
|
|
1554 |
PNGARG((png_const_charp user_png_ver, png_voidp error_ptr,
|
|
|
1555 |
png_error_ptr error_fn, png_error_ptr warn_fn));
|
|
|
1556 |
|
|
|
1557 |
/* Allocate and initialize png_ptr struct for writing, and any other memory */
|
|
|
1558 |
extern PNG_EXPORT(png_structp,png_create_write_struct)
|
|
|
1559 |
PNGARG((png_const_charp user_png_ver, png_voidp error_ptr,
|
|
|
1560 |
png_error_ptr error_fn, png_error_ptr warn_fn));
|
|
|
1561 |
|
|
|
1562 |
#ifdef PNG_WRITE_SUPPORTED
|
|
|
1563 |
extern PNG_EXPORT(png_uint_32,png_get_compression_buffer_size)
|
|
|
1564 |
PNGARG((png_structp png_ptr));
|
|
|
1565 |
#endif
|
|
|
1566 |
|
|
|
1567 |
#ifdef PNG_WRITE_SUPPORTED
|
|
|
1568 |
extern PNG_EXPORT(void,png_set_compression_buffer_size)
|
|
|
1569 |
PNGARG((png_structp png_ptr, png_uint_32 size));
|
|
|
1570 |
#endif
|
|
|
1571 |
|
|
|
1572 |
/* Reset the compression stream */
|
|
|
1573 |
extern PNG_EXPORT(int,png_reset_zstream) PNGARG((png_structp png_ptr));
|
|
|
1574 |
|
|
|
1575 |
/* New functions added in libpng-1.0.2 (not enabled by default until 1.2.0) */
|
|
|
1576 |
#ifdef PNG_USER_MEM_SUPPORTED
|
|
|
1577 |
extern PNG_EXPORT(png_structp,png_create_read_struct_2)
|
|
|
1578 |
PNGARG((png_const_charp user_png_ver, png_voidp error_ptr,
|
|
|
1579 |
png_error_ptr error_fn, png_error_ptr warn_fn, png_voidp mem_ptr,
|
|
|
1580 |
png_malloc_ptr malloc_fn, png_free_ptr free_fn));
|
|
|
1581 |
extern PNG_EXPORT(png_structp,png_create_write_struct_2)
|
|
|
1582 |
PNGARG((png_const_charp user_png_ver, png_voidp error_ptr,
|
|
|
1583 |
png_error_ptr error_fn, png_error_ptr warn_fn, png_voidp mem_ptr,
|
|
|
1584 |
png_malloc_ptr malloc_fn, png_free_ptr free_fn));
|
|
|
1585 |
#endif
|
|
|
1586 |
|
|
|
1587 |
/* Write a PNG chunk - size, type, (optional) data, CRC. */
|
|
|
1588 |
extern PNG_EXPORT(void,png_write_chunk) PNGARG((png_structp png_ptr,
|
|
|
1589 |
png_bytep chunk_name, png_bytep data, png_size_t length));
|
|
|
1590 |
|
|
|
1591 |
/* Write the start of a PNG chunk - length and chunk name. */
|
|
|
1592 |
extern PNG_EXPORT(void,png_write_chunk_start) PNGARG((png_structp png_ptr,
|
|
|
1593 |
png_bytep chunk_name, png_uint_32 length));
|
|
|
1594 |
|
|
|
1595 |
/* Write the data of a PNG chunk started with png_write_chunk_start(). */
|
|
|
1596 |
extern PNG_EXPORT(void,png_write_chunk_data) PNGARG((png_structp png_ptr,
|
|
|
1597 |
png_bytep data, png_size_t length));
|
|
|
1598 |
|
|
|
1599 |
/* Finish a chunk started with png_write_chunk_start() (includes CRC). */
|
|
|
1600 |
extern PNG_EXPORT(void,png_write_chunk_end) PNGARG((png_structp png_ptr));
|
|
|
1601 |
|
|
|
1602 |
/* Allocate and initialize the info structure */
|
|
|
1603 |
extern PNG_EXPORT(png_infop,png_create_info_struct)
|
|
|
1604 |
PNGARG((png_structp png_ptr));
|
|
|
1605 |
|
|
|
1606 |
#if defined(PNG_1_0_X) || defined (PNG_1_2_X)
|
|
|
1607 |
/* Initialize the info structure (old interface - DEPRECATED) */
|
|
|
1608 |
extern PNG_EXPORT(void,png_info_init) PNGARG((png_infop info_ptr));
|
|
|
1609 |
#undef png_info_init
|
|
|
1610 |
#define png_info_init(info_ptr) png_info_init_3(&info_ptr,\
|
|
|
1611 |
png_sizeof(png_info));
|
|
|
1612 |
#endif
|
|
|
1613 |
|
|
|
1614 |
extern PNG_EXPORT(void,png_info_init_3) PNGARG((png_infopp info_ptr,
|
|
|
1615 |
png_size_t png_info_struct_size));
|
|
|
1616 |
|
|
|
1617 |
/* Writes all the PNG information before the image. */
|
|
|
1618 |
extern PNG_EXPORT(void,png_write_info_before_PLTE) PNGARG((png_structp png_ptr,
|
|
|
1619 |
png_infop info_ptr));
|
|
|
1620 |
extern PNG_EXPORT(void,png_write_info) PNGARG((png_structp png_ptr,
|
|
|
1621 |
png_infop info_ptr));
|
|
|
1622 |
|
|
|
1623 |
#ifndef PNG_NO_SEQUENTIAL_READ_SUPPORTED
|
|
|
1624 |
/* Read the information before the actual image data. */
|
|
|
1625 |
extern PNG_EXPORT(void,png_read_info) PNGARG((png_structp png_ptr,
|
|
|
1626 |
png_infop info_ptr));
|
|
|
1627 |
#endif
|
|
|
1628 |
|
|
|
1629 |
#if defined(PNG_TIME_RFC1123_SUPPORTED)
|
|
|
1630 |
extern PNG_EXPORT(png_charp,png_convert_to_rfc1123)
|
|
|
1631 |
PNGARG((png_structp png_ptr, png_timep ptime));
|
|
|
1632 |
#endif
|
|
|
1633 |
|
|
|
1634 |
#if !defined(_WIN32_WCE)
|
|
|
1635 |
/* "time.h" functions are not supported on WindowsCE */
|
|
|
1636 |
#if defined(PNG_WRITE_tIME_SUPPORTED)
|
|
|
1637 |
/* Convert from a struct tm to png_time */
|
|
|
1638 |
extern PNG_EXPORT(void,png_convert_from_struct_tm) PNGARG((png_timep ptime,
|
|
|
1639 |
struct tm FAR * ttime));
|
|
|
1640 |
|
|
|
1641 |
/* Convert from time_t to png_time. Uses gmtime() */
|
|
|
1642 |
extern PNG_EXPORT(void,png_convert_from_time_t) PNGARG((png_timep ptime,
|
|
|
1643 |
time_t ttime));
|
|
|
1644 |
#endif /* PNG_WRITE_tIME_SUPPORTED */
|
|
|
1645 |
#endif /* _WIN32_WCE */
|
|
|
1646 |
|
|
|
1647 |
#if defined(PNG_READ_EXPAND_SUPPORTED)
|
|
|
1648 |
/* Expand data to 24-bit RGB, or 8-bit grayscale, with alpha if available. */
|
|
|
1649 |
extern PNG_EXPORT(void,png_set_expand) PNGARG((png_structp png_ptr));
|
|
|
1650 |
#if !defined(PNG_1_0_X)
|
|
|
1651 |
extern PNG_EXPORT(void,png_set_expand_gray_1_2_4_to_8) PNGARG((png_structp
|
|
|
1652 |
png_ptr));
|
|
|
1653 |
#endif
|
|
|
1654 |
extern PNG_EXPORT(void,png_set_palette_to_rgb) PNGARG((png_structp png_ptr));
|
|
|
1655 |
extern PNG_EXPORT(void,png_set_tRNS_to_alpha) PNGARG((png_structp png_ptr));
|
|
|
1656 |
#if defined(PNG_1_0_X) || defined (PNG_1_2_X)
|
|
|
1657 |
/* Deprecated */
|
|
|
1658 |
extern PNG_EXPORT(void,png_set_gray_1_2_4_to_8) PNGARG((png_structp png_ptr));
|
|
|
1659 |
#endif
|
|
|
1660 |
#endif
|
|
|
1661 |
|
|
|
1662 |
#if defined(PNG_READ_BGR_SUPPORTED) || defined(PNG_WRITE_BGR_SUPPORTED)
|
|
|
1663 |
/* Use blue, green, red order for pixels. */
|
|
|
1664 |
extern PNG_EXPORT(void,png_set_bgr) PNGARG((png_structp png_ptr));
|
|
|
1665 |
#endif
|
|
|
1666 |
|
|
|
1667 |
#if defined(PNG_READ_GRAY_TO_RGB_SUPPORTED)
|
|
|
1668 |
/* Expand the grayscale to 24-bit RGB if necessary. */
|
|
|
1669 |
extern PNG_EXPORT(void,png_set_gray_to_rgb) PNGARG((png_structp png_ptr));
|
|
|
1670 |
#endif
|
|
|
1671 |
|
|
|
1672 |
#if defined(PNG_READ_RGB_TO_GRAY_SUPPORTED)
|
|
|
1673 |
/* Reduce RGB to grayscale. */
|
|
|
1674 |
#ifdef PNG_FLOATING_POINT_SUPPORTED
|
|
|
1675 |
extern PNG_EXPORT(void,png_set_rgb_to_gray) PNGARG((png_structp png_ptr,
|
|
|
1676 |
int error_action, double red, double green ));
|
|
|
1677 |
#endif
|
|
|
1678 |
extern PNG_EXPORT(void,png_set_rgb_to_gray_fixed) PNGARG((png_structp png_ptr,
|
|
|
1679 |
int error_action, png_fixed_point red, png_fixed_point green ));
|
|
|
1680 |
extern PNG_EXPORT(png_byte,png_get_rgb_to_gray_status) PNGARG((png_structp
|
|
|
1681 |
png_ptr));
|
|
|
1682 |
#endif
|
|
|
1683 |
|
|
|
1684 |
extern PNG_EXPORT(void,png_build_grayscale_palette) PNGARG((int bit_depth,
|
|
|
1685 |
png_colorp palette));
|
|
|
1686 |
|
|
|
1687 |
#if defined(PNG_READ_STRIP_ALPHA_SUPPORTED)
|
|
|
1688 |
extern PNG_EXPORT(void,png_set_strip_alpha) PNGARG((png_structp png_ptr));
|
|
|
1689 |
#endif
|
|
|
1690 |
|
|
|
1691 |
#if defined(PNG_READ_SWAP_ALPHA_SUPPORTED) || \
|
|
|
1692 |
defined(PNG_WRITE_SWAP_ALPHA_SUPPORTED)
|
|
|
1693 |
extern PNG_EXPORT(void,png_set_swap_alpha) PNGARG((png_structp png_ptr));
|
|
|
1694 |
#endif
|
|
|
1695 |
|
|
|
1696 |
#if defined(PNG_READ_INVERT_ALPHA_SUPPORTED) || \
|
|
|
1697 |
defined(PNG_WRITE_INVERT_ALPHA_SUPPORTED)
|
|
|
1698 |
extern PNG_EXPORT(void,png_set_invert_alpha) PNGARG((png_structp png_ptr));
|
|
|
1699 |
#endif
|
|
|
1700 |
|
|
|
1701 |
#if defined(PNG_READ_FILLER_SUPPORTED) || defined(PNG_WRITE_FILLER_SUPPORTED)
|
|
|
1702 |
/* Add a filler byte to 8-bit Gray or 24-bit RGB images. */
|
|
|
1703 |
extern PNG_EXPORT(void,png_set_filler) PNGARG((png_structp png_ptr,
|
|
|
1704 |
png_uint_32 filler, int flags));
|
|
|
1705 |
/* The values of the PNG_FILLER_ defines should NOT be changed */
|
|
|
1706 |
#define PNG_FILLER_BEFORE 0
|
|
|
1707 |
#define PNG_FILLER_AFTER 1
|
|
|
1708 |
/* Add an alpha byte to 8-bit Gray or 24-bit RGB images. */
|
|
|
1709 |
#if !defined(PNG_1_0_X)
|
|
|
1710 |
extern PNG_EXPORT(void,png_set_add_alpha) PNGARG((png_structp png_ptr,
|
|
|
1711 |
png_uint_32 filler, int flags));
|
|
|
1712 |
#endif
|
|
|
1713 |
#endif /* PNG_READ_FILLER_SUPPORTED || PNG_WRITE_FILLER_SUPPORTED */
|
|
|
1714 |
|
|
|
1715 |
#if defined(PNG_READ_SWAP_SUPPORTED) || defined(PNG_WRITE_SWAP_SUPPORTED)
|
|
|
1716 |
/* Swap bytes in 16-bit depth files. */
|
|
|
1717 |
extern PNG_EXPORT(void,png_set_swap) PNGARG((png_structp png_ptr));
|
|
|
1718 |
#endif
|
|
|
1719 |
|
|
|
1720 |
#if defined(PNG_READ_PACK_SUPPORTED) || defined(PNG_WRITE_PACK_SUPPORTED)
|
|
|
1721 |
/* Use 1 byte per pixel in 1, 2, or 4-bit depth files. */
|
|
|
1722 |
extern PNG_EXPORT(void,png_set_packing) PNGARG((png_structp png_ptr));
|
|
|
1723 |
#endif
|
|
|
1724 |
|
|
|
1725 |
#if defined(PNG_READ_PACKSWAP_SUPPORTED) || defined(PNG_WRITE_PACKSWAP_SUPPORTED)
|
|
|
1726 |
/* Swap packing order of pixels in bytes. */
|
|
|
1727 |
extern PNG_EXPORT(void,png_set_packswap) PNGARG((png_structp png_ptr));
|
|
|
1728 |
#endif
|
|
|
1729 |
|
|
|
1730 |
#if defined(PNG_READ_SHIFT_SUPPORTED) || defined(PNG_WRITE_SHIFT_SUPPORTED)
|
|
|
1731 |
/* Converts files to legal bit depths. */
|
|
|
1732 |
extern PNG_EXPORT(void,png_set_shift) PNGARG((png_structp png_ptr,
|
|
|
1733 |
png_color_8p true_bits));
|
|
|
1734 |
#endif
|
|
|
1735 |
|
|
|
1736 |
#if defined(PNG_READ_INTERLACING_SUPPORTED) || \
|
|
|
1737 |
defined(PNG_WRITE_INTERLACING_SUPPORTED)
|
|
|
1738 |
/* Have the code handle the interlacing. Returns the number of passes. */
|
|
|
1739 |
extern PNG_EXPORT(int,png_set_interlace_handling) PNGARG((png_structp png_ptr));
|
|
|
1740 |
#endif
|
|
|
1741 |
|
|
|
1742 |
#if defined(PNG_READ_INVERT_SUPPORTED) || defined(PNG_WRITE_INVERT_SUPPORTED)
|
|
|
1743 |
/* Invert monochrome files */
|
|
|
1744 |
extern PNG_EXPORT(void,png_set_invert_mono) PNGARG((png_structp png_ptr));
|
|
|
1745 |
#endif
|
|
|
1746 |
|
|
|
1747 |
#if defined(PNG_READ_BACKGROUND_SUPPORTED)
|
|
|
1748 |
/* Handle alpha and tRNS by replacing with a background color. */
|
|
|
1749 |
#ifdef PNG_FLOATING_POINT_SUPPORTED
|
|
|
1750 |
extern PNG_EXPORT(void,png_set_background) PNGARG((png_structp png_ptr,
|
|
|
1751 |
png_color_16p background_color, int background_gamma_code,
|
|
|
1752 |
int need_expand, double background_gamma));
|
|
|
1753 |
#endif
|
|
|
1754 |
#define PNG_BACKGROUND_GAMMA_UNKNOWN 0
|
|
|
1755 |
#define PNG_BACKGROUND_GAMMA_SCREEN 1
|
|
|
1756 |
#define PNG_BACKGROUND_GAMMA_FILE 2
|
|
|
1757 |
#define PNG_BACKGROUND_GAMMA_UNIQUE 3
|
|
|
1758 |
#endif
|
|
|
1759 |
|
|
|
1760 |
#if defined(PNG_READ_16_TO_8_SUPPORTED)
|
|
|
1761 |
/* Strip the second byte of information from a 16-bit depth file. */
|
|
|
1762 |
extern PNG_EXPORT(void,png_set_strip_16) PNGARG((png_structp png_ptr));
|
|
|
1763 |
#endif
|
|
|
1764 |
|
|
|
1765 |
#if defined(PNG_READ_DITHER_SUPPORTED)
|
|
|
1766 |
/* Turn on dithering, and reduce the palette to the number of colors available. */
|
|
|
1767 |
extern PNG_EXPORT(void,png_set_dither) PNGARG((png_structp png_ptr,
|
|
|
1768 |
png_colorp palette, int num_palette, int maximum_colors,
|
|
|
1769 |
png_uint_16p histogram, int full_dither));
|
|
|
1770 |
#endif
|
|
|
1771 |
|
|
|
1772 |
#if defined(PNG_READ_GAMMA_SUPPORTED)
|
|
|
1773 |
/* Handle gamma correction. Screen_gamma=(display_exponent) */
|
|
|
1774 |
#ifdef PNG_FLOATING_POINT_SUPPORTED
|
|
|
1775 |
extern PNG_EXPORT(void,png_set_gamma) PNGARG((png_structp png_ptr,
|
|
|
1776 |
double screen_gamma, double default_file_gamma));
|
|
|
1777 |
#endif
|
|
|
1778 |
#endif
|
|
|
1779 |
|
|
|
1780 |
#if defined(PNG_1_0_X) || defined (PNG_1_2_X)
|
|
|
1781 |
#if defined(PNG_READ_EMPTY_PLTE_SUPPORTED) || \
|
|
|
1782 |
defined(PNG_WRITE_EMPTY_PLTE_SUPPORTED)
|
|
|
1783 |
/* Permit or disallow empty PLTE (0: not permitted, 1: permitted) */
|
|
|
1784 |
/* Deprecated and will be removed. Use png_permit_mng_features() instead. */
|
|
|
1785 |
extern PNG_EXPORT(void,png_permit_empty_plte) PNGARG((png_structp png_ptr,
|
|
|
1786 |
int empty_plte_permitted));
|
|
|
1787 |
#endif
|
|
|
1788 |
#endif
|
|
|
1789 |
|
|
|
1790 |
#if defined(PNG_WRITE_FLUSH_SUPPORTED)
|
|
|
1791 |
/* Set how many lines between output flushes - 0 for no flushing */
|
|
|
1792 |
extern PNG_EXPORT(void,png_set_flush) PNGARG((png_structp png_ptr, int nrows));
|
|
|
1793 |
/* Flush the current PNG output buffer */
|
|
|
1794 |
extern PNG_EXPORT(void,png_write_flush) PNGARG((png_structp png_ptr));
|
|
|
1795 |
#endif
|
|
|
1796 |
|
|
|
1797 |
/* Optional update palette with requested transformations */
|
|
|
1798 |
extern PNG_EXPORT(void,png_start_read_image) PNGARG((png_structp png_ptr));
|
|
|
1799 |
|
|
|
1800 |
/* Optional call to update the users info structure */
|
|
|
1801 |
extern PNG_EXPORT(void,png_read_update_info) PNGARG((png_structp png_ptr,
|
|
|
1802 |
png_infop info_ptr));
|
|
|
1803 |
|
|
|
1804 |
#ifndef PNG_NO_SEQUENTIAL_READ_SUPPORTED
|
|
|
1805 |
/* Read one or more rows of image data. */
|
|
|
1806 |
extern PNG_EXPORT(void,png_read_rows) PNGARG((png_structp png_ptr,
|
|
|
1807 |
png_bytepp row, png_bytepp display_row, png_uint_32 num_rows));
|
|
|
1808 |
#endif
|
|
|
1809 |
|
|
|
1810 |
#ifndef PNG_NO_SEQUENTIAL_READ_SUPPORTED
|
|
|
1811 |
/* Read a row of data. */
|
|
|
1812 |
extern PNG_EXPORT(void,png_read_row) PNGARG((png_structp png_ptr,
|
|
|
1813 |
png_bytep row,
|
|
|
1814 |
png_bytep display_row));
|
|
|
1815 |
#endif
|
|
|
1816 |
|
|
|
1817 |
#ifndef PNG_NO_SEQUENTIAL_READ_SUPPORTED
|
|
|
1818 |
/* Read the whole image into memory at once. */
|
|
|
1819 |
extern PNG_EXPORT(void,png_read_image) PNGARG((png_structp png_ptr,
|
|
|
1820 |
png_bytepp image));
|
|
|
1821 |
#endif
|
|
|
1822 |
|
|
|
1823 |
/* Write a row of image data */
|
|
|
1824 |
extern PNG_EXPORT(void,png_write_row) PNGARG((png_structp png_ptr,
|
|
|
1825 |
png_bytep row));
|
|
|
1826 |
|
|
|
1827 |
/* Write a few rows of image data */
|
|
|
1828 |
extern PNG_EXPORT(void,png_write_rows) PNGARG((png_structp png_ptr,
|
|
|
1829 |
png_bytepp row, png_uint_32 num_rows));
|
|
|
1830 |
|
|
|
1831 |
/* Write the image data */
|
|
|
1832 |
extern PNG_EXPORT(void,png_write_image) PNGARG((png_structp png_ptr,
|
|
|
1833 |
png_bytepp image));
|
|
|
1834 |
|
|
|
1835 |
/* Writes the end of the PNG file. */
|
|
|
1836 |
extern PNG_EXPORT(void,png_write_end) PNGARG((png_structp png_ptr,
|
|
|
1837 |
png_infop info_ptr));
|
|
|
1838 |
|
|
|
1839 |
#ifndef PNG_NO_SEQUENTIAL_READ_SUPPORTED
|
|
|
1840 |
/* Read the end of the PNG file. */
|
|
|
1841 |
extern PNG_EXPORT(void,png_read_end) PNGARG((png_structp png_ptr,
|
|
|
1842 |
png_infop info_ptr));
|
|
|
1843 |
#endif
|
|
|
1844 |
|
|
|
1845 |
/* Free any memory associated with the png_info_struct */
|
|
|
1846 |
extern PNG_EXPORT(void,png_destroy_info_struct) PNGARG((png_structp png_ptr,
|
|
|
1847 |
png_infopp info_ptr_ptr));
|
|
|
1848 |
|
|
|
1849 |
/* Free any memory associated with the png_struct and the png_info_structs */
|
|
|
1850 |
extern PNG_EXPORT(void,png_destroy_read_struct) PNGARG((png_structpp
|
|
|
1851 |
png_ptr_ptr, png_infopp info_ptr_ptr, png_infopp end_info_ptr_ptr));
|
|
|
1852 |
|
|
|
1853 |
/* Free all memory used by the read (old method - NOT DLL EXPORTED) */
|
|
|
1854 |
extern void png_read_destroy PNGARG((png_structp png_ptr, png_infop info_ptr,
|
|
|
1855 |
png_infop end_info_ptr));
|
|
|
1856 |
|
|
|
1857 |
/* Free any memory associated with the png_struct and the png_info_structs */
|
|
|
1858 |
extern PNG_EXPORT(void,png_destroy_write_struct)
|
|
|
1859 |
PNGARG((png_structpp png_ptr_ptr, png_infopp info_ptr_ptr));
|
|
|
1860 |
|
|
|
1861 |
/* Free any memory used in png_ptr struct (old method - NOT DLL EXPORTED) */
|
|
|
1862 |
extern void png_write_destroy PNGARG((png_structp png_ptr));
|
|
|
1863 |
|
|
|
1864 |
/* Set the libpng method of handling chunk CRC errors */
|
|
|
1865 |
extern PNG_EXPORT(void,png_set_crc_action) PNGARG((png_structp png_ptr,
|
|
|
1866 |
int crit_action, int ancil_action));
|
|
|
1867 |
|
|
|
1868 |
/* Values for png_set_crc_action() to say how to handle CRC errors in
|
|
|
1869 |
* ancillary and critical chunks, and whether to use the data contained
|
|
|
1870 |
* therein. Note that it is impossible to "discard" data in a critical
|
|
|
1871 |
* chunk. For versions prior to 0.90, the action was always error/quit,
|
|
|
1872 |
* whereas in version 0.90 and later, the action for CRC errors in ancillary
|
|
|
1873 |
* chunks is warn/discard. These values should NOT be changed.
|
|
|
1874 |
*
|
|
|
1875 |
* value action:critical action:ancillary
|
|
|
1876 |
*/
|
|
|
1877 |
#define PNG_CRC_DEFAULT 0 /* error/quit warn/discard data */
|
|
|
1878 |
#define PNG_CRC_ERROR_QUIT 1 /* error/quit error/quit */
|
|
|
1879 |
#define PNG_CRC_WARN_DISCARD 2 /* (INVALID) warn/discard data */
|
|
|
1880 |
#define PNG_CRC_WARN_USE 3 /* warn/use data warn/use data */
|
|
|
1881 |
#define PNG_CRC_QUIET_USE 4 /* quiet/use data quiet/use data */
|
|
|
1882 |
#define PNG_CRC_NO_CHANGE 5 /* use current value use current value */
|
|
|
1883 |
|
|
|
1884 |
/* These functions give the user control over the scan-line filtering in
|
|
|
1885 |
* libpng and the compression methods used by zlib. These functions are
|
|
|
1886 |
* mainly useful for testing, as the defaults should work with most users.
|
|
|
1887 |
* Those users who are tight on memory or want faster performance at the
|
|
|
1888 |
* expense of compression can modify them. See the compression library
|
|
|
1889 |
* header file (zlib.h) for an explination of the compression functions.
|
|
|
1890 |
*/
|
|
|
1891 |
|
|
|
1892 |
/* Set the filtering method(s) used by libpng. Currently, the only valid
|
|
|
1893 |
* value for "method" is 0.
|
|
|
1894 |
*/
|
|
|
1895 |
extern PNG_EXPORT(void,png_set_filter) PNGARG((png_structp png_ptr, int method,
|
|
|
1896 |
int filters));
|
|
|
1897 |
|
|
|
1898 |
/* Flags for png_set_filter() to say which filters to use. The flags
|
|
|
1899 |
* are chosen so that they don't conflict with real filter types
|
|
|
1900 |
* below, in case they are supplied instead of the #defined constants.
|
|
|
1901 |
* These values should NOT be changed.
|
|
|
1902 |
*/
|
|
|
1903 |
#define PNG_NO_FILTERS 0x00
|
|
|
1904 |
#define PNG_FILTER_NONE 0x08
|
|
|
1905 |
#define PNG_FILTER_SUB 0x10
|
|
|
1906 |
#define PNG_FILTER_UP 0x20
|
|
|
1907 |
#define PNG_FILTER_AVG 0x40
|
|
|
1908 |
#define PNG_FILTER_PAETH 0x80
|
|
|
1909 |
#define PNG_ALL_FILTERS (PNG_FILTER_NONE | PNG_FILTER_SUB | PNG_FILTER_UP | \
|
|
|
1910 |
PNG_FILTER_AVG | PNG_FILTER_PAETH)
|
|
|
1911 |
|
|
|
1912 |
/* Filter values (not flags) - used in pngwrite.c, pngwutil.c for now.
|
|
|
1913 |
* These defines should NOT be changed.
|
|
|
1914 |
*/
|
|
|
1915 |
#define PNG_FILTER_VALUE_NONE 0
|
|
|
1916 |
#define PNG_FILTER_VALUE_SUB 1
|
|
|
1917 |
#define PNG_FILTER_VALUE_UP 2
|
|
|
1918 |
#define PNG_FILTER_VALUE_AVG 3
|
|
|
1919 |
#define PNG_FILTER_VALUE_PAETH 4
|
|
|
1920 |
#define PNG_FILTER_VALUE_LAST 5
|
|
|
1921 |
|
|
|
1922 |
#if defined(PNG_WRITE_WEIGHTED_FILTER_SUPPORTED) /* EXPERIMENTAL */
|
|
|
1923 |
/* The "heuristic_method" is given by one of the PNG_FILTER_HEURISTIC_
|
|
|
1924 |
* defines, either the default (minimum-sum-of-absolute-differences), or
|
|
|
1925 |
* the experimental method (weighted-minimum-sum-of-absolute-differences).
|
|
|
1926 |
*
|
|
|
1927 |
* Weights are factors >= 1.0, indicating how important it is to keep the
|
|
|
1928 |
* filter type consistent between rows. Larger numbers mean the current
|
|
|
1929 |
* filter is that many times as likely to be the same as the "num_weights"
|
|
|
1930 |
* previous filters. This is cumulative for each previous row with a weight.
|
|
|
1931 |
* There needs to be "num_weights" values in "filter_weights", or it can be
|
|
|
1932 |
* NULL if the weights aren't being specified. Weights have no influence on
|
|
|
1933 |
* the selection of the first row filter. Well chosen weights can (in theory)
|
|
|
1934 |
* improve the compression for a given image.
|
|
|
1935 |
*
|
|
|
1936 |
* Costs are factors >= 1.0 indicating the relative decoding costs of a
|
|
|
1937 |
* filter type. Higher costs indicate more decoding expense, and are
|
|
|
1938 |
* therefore less likely to be selected over a filter with lower computational
|
|
|
1939 |
* costs. There needs to be a value in "filter_costs" for each valid filter
|
|
|
1940 |
* type (given by PNG_FILTER_VALUE_LAST), or it can be NULL if you aren't
|
|
|
1941 |
* setting the costs. Costs try to improve the speed of decompression without
|
|
|
1942 |
* unduly increasing the compressed image size.
|
|
|
1943 |
*
|
|
|
1944 |
* A negative weight or cost indicates the default value is to be used, and
|
|
|
1945 |
* values in the range [0.0, 1.0) indicate the value is to remain unchanged.
|
|
|
1946 |
* The default values for both weights and costs are currently 1.0, but may
|
|
|
1947 |
* change if good general weighting/cost heuristics can be found. If both
|
|
|
1948 |
* the weights and costs are set to 1.0, this degenerates the WEIGHTED method
|
|
|
1949 |
* to the UNWEIGHTED method, but with added encoding time/computation.
|
|
|
1950 |
*/
|
|
|
1951 |
#ifdef PNG_FLOATING_POINT_SUPPORTED
|
|
|
1952 |
extern PNG_EXPORT(void,png_set_filter_heuristics) PNGARG((png_structp png_ptr,
|
|
|
1953 |
int heuristic_method, int num_weights, png_doublep filter_weights,
|
|
|
1954 |
png_doublep filter_costs));
|
|
|
1955 |
#endif
|
|
|
1956 |
#endif /* PNG_WRITE_WEIGHTED_FILTER_SUPPORTED */
|
|
|
1957 |
|
|
|
1958 |
/* Heuristic used for row filter selection. These defines should NOT be
|
|
|
1959 |
* changed.
|
|
|
1960 |
*/
|
|
|
1961 |
#define PNG_FILTER_HEURISTIC_DEFAULT 0 /* Currently "UNWEIGHTED" */
|
|
|
1962 |
#define PNG_FILTER_HEURISTIC_UNWEIGHTED 1 /* Used by libpng < 0.95 */
|
|
|
1963 |
#define PNG_FILTER_HEURISTIC_WEIGHTED 2 /* Experimental feature */
|
|
|
1964 |
#define PNG_FILTER_HEURISTIC_LAST 3 /* Not a valid value */
|
|
|
1965 |
|
|
|
1966 |
/* Set the library compression level. Currently, valid values range from
|
|
|
1967 |
* 0 - 9, corresponding directly to the zlib compression levels 0 - 9
|
|
|
1968 |
* (0 - no compression, 9 - "maximal" compression). Note that tests have
|
|
|
1969 |
* shown that zlib compression levels 3-6 usually perform as well as level 9
|
|
|
1970 |
* for PNG images, and do considerably fewer caclulations. In the future,
|
|
|
1971 |
* these values may not correspond directly to the zlib compression levels.
|
|
|
1972 |
*/
|
|
|
1973 |
extern PNG_EXPORT(void,png_set_compression_level) PNGARG((png_structp png_ptr,
|
|
|
1974 |
int level));
|
|
|
1975 |
|
|
|
1976 |
extern PNG_EXPORT(void,png_set_compression_mem_level)
|
|
|
1977 |
PNGARG((png_structp png_ptr, int mem_level));
|
|
|
1978 |
|
|
|
1979 |
extern PNG_EXPORT(void,png_set_compression_strategy)
|
|
|
1980 |
PNGARG((png_structp png_ptr, int strategy));
|
|
|
1981 |
|
|
|
1982 |
extern PNG_EXPORT(void,png_set_compression_window_bits)
|
|
|
1983 |
PNGARG((png_structp png_ptr, int window_bits));
|
|
|
1984 |
|
|
|
1985 |
extern PNG_EXPORT(void,png_set_compression_method) PNGARG((png_structp png_ptr,
|
|
|
1986 |
int method));
|
|
|
1987 |
|
|
|
1988 |
/* These next functions are called for input/output, memory, and error
|
|
|
1989 |
* handling. They are in the file pngrio.c, pngwio.c, and pngerror.c,
|
|
|
1990 |
* and call standard C I/O routines such as fread(), fwrite(), and
|
|
|
1991 |
* fprintf(). These functions can be made to use other I/O routines
|
|
|
1992 |
* at run time for those applications that need to handle I/O in a
|
|
|
1993 |
* different manner by calling png_set_???_fn(). See libpng.txt for
|
|
|
1994 |
* more information.
|
|
|
1995 |
*/
|
|
|
1996 |
|
|
|
1997 |
#if !defined(PNG_NO_STDIO)
|
|
|
1998 |
/* Initialize the input/output for the PNG file to the default functions. */
|
|
|
1999 |
extern PNG_EXPORT(void,png_init_io) PNGARG((png_structp png_ptr, png_FILE_p fp));
|
|
|
2000 |
#endif
|
|
|
2001 |
|
|
|
2002 |
/* Replace the (error and abort), and warning functions with user
|
|
|
2003 |
* supplied functions. If no messages are to be printed you must still
|
|
|
2004 |
* write and use replacement functions. The replacement error_fn should
|
|
|
2005 |
* still do a longjmp to the last setjmp location if you are using this
|
|
|
2006 |
* method of error handling. If error_fn or warning_fn is NULL, the
|
|
|
2007 |
* default function will be used.
|
|
|
2008 |
*/
|
|
|
2009 |
|
|
|
2010 |
extern PNG_EXPORT(void,png_set_error_fn) PNGARG((png_structp png_ptr,
|
|
|
2011 |
png_voidp error_ptr, png_error_ptr error_fn, png_error_ptr warning_fn));
|
|
|
2012 |
|
|
|
2013 |
/* Return the user pointer associated with the error functions */
|
|
|
2014 |
extern PNG_EXPORT(png_voidp,png_get_error_ptr) PNGARG((png_structp png_ptr));
|
|
|
2015 |
|
|
|
2016 |
/* Replace the default data output functions with a user supplied one(s).
|
|
|
2017 |
* If buffered output is not used, then output_flush_fn can be set to NULL.
|
|
|
2018 |
* If PNG_WRITE_FLUSH_SUPPORTED is not defined at libpng compile time
|
|
|
2019 |
* output_flush_fn will be ignored (and thus can be NULL).
|
|
|
2020 |
* It is probably a mistake to use NULL for output_flush_fn if
|
|
|
2021 |
* write_data_fn is not also NULL unless you have built libpng with
|
|
|
2022 |
* PNG_WRITE_FLUSH_SUPPORTED undefined, because in this case libpng's
|
|
|
2023 |
* default flush function, which uses the standard *FILE structure, will
|
|
|
2024 |
* be used.
|
|
|
2025 |
*/
|
|
|
2026 |
extern PNG_EXPORT(void,png_set_write_fn) PNGARG((png_structp png_ptr,
|
|
|
2027 |
png_voidp io_ptr, png_rw_ptr write_data_fn, png_flush_ptr output_flush_fn));
|
|
|
2028 |
|
|
|
2029 |
/* Replace the default data input function with a user supplied one. */
|
|
|
2030 |
extern PNG_EXPORT(void,png_set_read_fn) PNGARG((png_structp png_ptr,
|
|
|
2031 |
png_voidp io_ptr, png_rw_ptr read_data_fn));
|
|
|
2032 |
|
|
|
2033 |
/* Return the user pointer associated with the I/O functions */
|
|
|
2034 |
extern PNG_EXPORT(png_voidp,png_get_io_ptr) PNGARG((png_structp png_ptr));
|
|
|
2035 |
|
|
|
2036 |
extern PNG_EXPORT(void,png_set_read_status_fn) PNGARG((png_structp png_ptr,
|
|
|
2037 |
png_read_status_ptr read_row_fn));
|
|
|
2038 |
|
|
|
2039 |
extern PNG_EXPORT(void,png_set_write_status_fn) PNGARG((png_structp png_ptr,
|
|
|
2040 |
png_write_status_ptr write_row_fn));
|
|
|
2041 |
|
|
|
2042 |
#ifdef PNG_USER_MEM_SUPPORTED
|
|
|
2043 |
/* Replace the default memory allocation functions with user supplied one(s). */
|
|
|
2044 |
extern PNG_EXPORT(void,png_set_mem_fn) PNGARG((png_structp png_ptr,
|
|
|
2045 |
png_voidp mem_ptr, png_malloc_ptr malloc_fn, png_free_ptr free_fn));
|
|
|
2046 |
/* Return the user pointer associated with the memory functions */
|
|
|
2047 |
extern PNG_EXPORT(png_voidp,png_get_mem_ptr) PNGARG((png_structp png_ptr));
|
|
|
2048 |
#endif
|
|
|
2049 |
|
|
|
2050 |
#if defined(PNG_READ_USER_TRANSFORM_SUPPORTED) || \
|
|
|
2051 |
defined(PNG_LEGACY_SUPPORTED)
|
|
|
2052 |
extern PNG_EXPORT(void,png_set_read_user_transform_fn) PNGARG((png_structp
|
|
|
2053 |
png_ptr, png_user_transform_ptr read_user_transform_fn));
|
|
|
2054 |
#endif
|
|
|
2055 |
|
|
|
2056 |
#if defined(PNG_WRITE_USER_TRANSFORM_SUPPORTED) || \
|
|
|
2057 |
defined(PNG_LEGACY_SUPPORTED)
|
|
|
2058 |
extern PNG_EXPORT(void,png_set_write_user_transform_fn) PNGARG((png_structp
|
|
|
2059 |
png_ptr, png_user_transform_ptr write_user_transform_fn));
|
|
|
2060 |
#endif
|
|
|
2061 |
|
|
|
2062 |
#if defined(PNG_READ_USER_TRANSFORM_SUPPORTED) || \
|
|
|
2063 |
defined(PNG_WRITE_USER_TRANSFORM_SUPPORTED) || \
|
|
|
2064 |
defined(PNG_LEGACY_SUPPORTED)
|
|
|
2065 |
extern PNG_EXPORT(void,png_set_user_transform_info) PNGARG((png_structp
|
|
|
2066 |
png_ptr, png_voidp user_transform_ptr, int user_transform_depth,
|
|
|
2067 |
int user_transform_channels));
|
|
|
2068 |
/* Return the user pointer associated with the user transform functions */
|
|
|
2069 |
extern PNG_EXPORT(png_voidp,png_get_user_transform_ptr)
|
|
|
2070 |
PNGARG((png_structp png_ptr));
|
|
|
2071 |
#endif
|
|
|
2072 |
|
|
|
2073 |
#ifdef PNG_USER_CHUNKS_SUPPORTED
|
|
|
2074 |
extern PNG_EXPORT(void,png_set_read_user_chunk_fn) PNGARG((png_structp png_ptr,
|
|
|
2075 |
png_voidp user_chunk_ptr, png_user_chunk_ptr read_user_chunk_fn));
|
|
|
2076 |
extern PNG_EXPORT(png_voidp,png_get_user_chunk_ptr) PNGARG((png_structp
|
|
|
2077 |
png_ptr));
|
|
|
2078 |
#endif
|
|
|
2079 |
|
|
|
2080 |
#ifdef PNG_PROGRESSIVE_READ_SUPPORTED
|
|
|
2081 |
/* Sets the function callbacks for the push reader, and a pointer to a
|
|
|
2082 |
* user-defined structure available to the callback functions.
|
|
|
2083 |
*/
|
|
|
2084 |
extern PNG_EXPORT(void,png_set_progressive_read_fn) PNGARG((png_structp png_ptr,
|
|
|
2085 |
png_voidp progressive_ptr,
|
|
|
2086 |
png_progressive_info_ptr info_fn, png_progressive_row_ptr row_fn,
|
|
|
2087 |
png_progressive_end_ptr end_fn));
|
|
|
2088 |
|
|
|
2089 |
/* Returns the user pointer associated with the push read functions */
|
|
|
2090 |
extern PNG_EXPORT(png_voidp,png_get_progressive_ptr)
|
|
|
2091 |
PNGARG((png_structp png_ptr));
|
|
|
2092 |
|
|
|
2093 |
/* Function to be called when data becomes available */
|
|
|
2094 |
extern PNG_EXPORT(void,png_process_data) PNGARG((png_structp png_ptr,
|
|
|
2095 |
png_infop info_ptr, png_bytep buffer, png_size_t buffer_size));
|
|
|
2096 |
|
|
|
2097 |
/* Function that combines rows. Not very much different than the
|
|
|
2098 |
* png_combine_row() call. Is this even used?????
|
|
|
2099 |
*/
|
|
|
2100 |
extern PNG_EXPORT(void,png_progressive_combine_row) PNGARG((png_structp png_ptr,
|
|
|
2101 |
png_bytep old_row, png_bytep new_row));
|
|
|
2102 |
#endif /* PNG_PROGRESSIVE_READ_SUPPORTED */
|
|
|
2103 |
|
|
|
2104 |
extern PNG_EXPORT(png_voidp,png_malloc) PNGARG((png_structp png_ptr,
|
|
|
2105 |
png_uint_32 size));
|
|
|
2106 |
|
|
|
2107 |
#if defined(PNG_1_0_X)
|
|
|
2108 |
# define png_malloc_warn png_malloc
|
|
|
2109 |
#else
|
|
|
2110 |
/* Added at libpng version 1.2.4 */
|
|
|
2111 |
extern PNG_EXPORT(png_voidp,png_malloc_warn) PNGARG((png_structp png_ptr,
|
|
|
2112 |
png_uint_32 size));
|
|
|
2113 |
#endif
|
|
|
2114 |
|
|
|
2115 |
/* Frees a pointer allocated by png_malloc() */
|
|
|
2116 |
extern PNG_EXPORT(void,png_free) PNGARG((png_structp png_ptr, png_voidp ptr));
|
|
|
2117 |
|
|
|
2118 |
#if defined(PNG_1_0_X)
|
|
|
2119 |
/* Function to allocate memory for zlib. */
|
|
|
2120 |
extern PNG_EXPORT(voidpf,png_zalloc) PNGARG((voidpf png_ptr, uInt items,
|
|
|
2121 |
uInt size));
|
|
|
2122 |
|
|
|
2123 |
/* Function to free memory for zlib */
|
|
|
2124 |
extern PNG_EXPORT(void,png_zfree) PNGARG((voidpf png_ptr, voidpf ptr));
|
|
|
2125 |
#endif
|
|
|
2126 |
|
|
|
2127 |
/* Free data that was allocated internally */
|
|
|
2128 |
extern PNG_EXPORT(void,png_free_data) PNGARG((png_structp png_ptr,
|
|
|
2129 |
png_infop info_ptr, png_uint_32 free_me, int num));
|
|
|
2130 |
#ifdef PNG_FREE_ME_SUPPORTED
|
|
|
2131 |
/* Reassign responsibility for freeing existing data, whether allocated
|
|
|
2132 |
* by libpng or by the application
|
|
|
2133 |
*/
|
|
|
2134 |
extern PNG_EXPORT(void,png_data_freer) PNGARG((png_structp png_ptr,
|
|
|
2135 |
png_infop info_ptr, int freer, png_uint_32 mask));
|
|
|
2136 |
#endif
|
|
|
2137 |
/* Assignments for png_data_freer */
|
|
|
2138 |
#define PNG_DESTROY_WILL_FREE_DATA 1
|
|
|
2139 |
#define PNG_SET_WILL_FREE_DATA 1
|
|
|
2140 |
#define PNG_USER_WILL_FREE_DATA 2
|
|
|
2141 |
/* Flags for png_ptr->free_me and info_ptr->free_me */
|
|
|
2142 |
#define PNG_FREE_HIST 0x0008
|
|
|
2143 |
#define PNG_FREE_ICCP 0x0010
|
|
|
2144 |
#define PNG_FREE_SPLT 0x0020
|
|
|
2145 |
#define PNG_FREE_ROWS 0x0040
|
|
|
2146 |
#define PNG_FREE_PCAL 0x0080
|
|
|
2147 |
#define PNG_FREE_SCAL 0x0100
|
|
|
2148 |
#define PNG_FREE_UNKN 0x0200
|
|
|
2149 |
#define PNG_FREE_LIST 0x0400
|
|
|
2150 |
#define PNG_FREE_PLTE 0x1000
|
|
|
2151 |
#define PNG_FREE_TRNS 0x2000
|
|
|
2152 |
#define PNG_FREE_TEXT 0x4000
|
|
|
2153 |
#define PNG_FREE_ALL 0x7fff
|
|
|
2154 |
#define PNG_FREE_MUL 0x4220 /* PNG_FREE_SPLT|PNG_FREE_TEXT|PNG_FREE_UNKN */
|
|
|
2155 |
|
|
|
2156 |
#ifdef PNG_USER_MEM_SUPPORTED
|
|
|
2157 |
extern PNG_EXPORT(png_voidp,png_malloc_default) PNGARG((png_structp png_ptr,
|
|
|
2158 |
png_uint_32 size));
|
|
|
2159 |
extern PNG_EXPORT(void,png_free_default) PNGARG((png_structp png_ptr,
|
|
|
2160 |
png_voidp ptr));
|
|
|
2161 |
#endif
|
|
|
2162 |
|
|
|
2163 |
extern PNG_EXPORT(png_voidp,png_memcpy_check) PNGARG((png_structp png_ptr,
|
|
|
2164 |
png_voidp s1, png_voidp s2, png_uint_32 size));
|
|
|
2165 |
|
|
|
2166 |
extern PNG_EXPORT(png_voidp,png_memset_check) PNGARG((png_structp png_ptr,
|
|
|
2167 |
png_voidp s1, int value, png_uint_32 size));
|
|
|
2168 |
|
|
|
2169 |
#if defined(USE_FAR_KEYWORD) /* memory model conversion function */
|
|
|
2170 |
extern void *png_far_to_near PNGARG((png_structp png_ptr,png_voidp ptr,
|
|
|
2171 |
int check));
|
|
|
2172 |
#endif /* USE_FAR_KEYWORD */
|
|
|
2173 |
|
|
|
2174 |
#ifndef PNG_NO_ERROR_TEXT
|
|
|
2175 |
/* Fatal error in PNG image of libpng - can't continue */
|
|
|
2176 |
extern PNG_EXPORT(void,png_error) PNGARG((png_structp png_ptr,
|
|
|
2177 |
png_const_charp error_message));
|
|
|
2178 |
|
|
|
2179 |
/* The same, but the chunk name is prepended to the error string. */
|
|
|
2180 |
extern PNG_EXPORT(void,png_chunk_error) PNGARG((png_structp png_ptr,
|
|
|
2181 |
png_const_charp error_message));
|
|
|
2182 |
#else
|
|
|
2183 |
/* Fatal error in PNG image of libpng - can't continue */
|
|
|
2184 |
extern PNG_EXPORT(void,png_err) PNGARG((png_structp png_ptr));
|
|
|
2185 |
#endif
|
|
|
2186 |
|
|
|
2187 |
#ifndef PNG_NO_WARNINGS
|
|
|
2188 |
/* Non-fatal error in libpng. Can continue, but may have a problem. */
|
|
|
2189 |
extern PNG_EXPORT(void,png_warning) PNGARG((png_structp png_ptr,
|
|
|
2190 |
png_const_charp warning_message));
|
|
|
2191 |
|
|
|
2192 |
#ifdef PNG_READ_SUPPORTED
|
|
|
2193 |
/* Non-fatal error in libpng, chunk name is prepended to message. */
|
|
|
2194 |
extern PNG_EXPORT(void,png_chunk_warning) PNGARG((png_structp png_ptr,
|
|
|
2195 |
png_const_charp warning_message));
|
|
|
2196 |
#endif /* PNG_READ_SUPPORTED */
|
|
|
2197 |
#endif /* PNG_NO_WARNINGS */
|
|
|
2198 |
|
|
|
2199 |
/* The png_set_<chunk> functions are for storing values in the png_info_struct.
|
|
|
2200 |
* Similarly, the png_get_<chunk> calls are used to read values from the
|
|
|
2201 |
* png_info_struct, either storing the parameters in the passed variables, or
|
|
|
2202 |
* setting pointers into the png_info_struct where the data is stored. The
|
|
|
2203 |
* png_get_<chunk> functions return a non-zero value if the data was available
|
|
|
2204 |
* in info_ptr, or return zero and do not change any of the parameters if the
|
|
|
2205 |
* data was not available.
|
|
|
2206 |
*
|
|
|
2207 |
* These functions should be used instead of directly accessing png_info
|
|
|
2208 |
* to avoid problems with future changes in the size and internal layout of
|
|
|
2209 |
* png_info_struct.
|
|
|
2210 |
*/
|
|
|
2211 |
/* Returns "flag" if chunk data is valid in info_ptr. */
|
|
|
2212 |
extern PNG_EXPORT(png_uint_32,png_get_valid) PNGARG((png_structp png_ptr,
|
|
|
2213 |
png_infop info_ptr, png_uint_32 flag));
|
|
|
2214 |
|
|
|
2215 |
/* Returns number of bytes needed to hold a transformed row. */
|
|
|
2216 |
extern PNG_EXPORT(png_uint_32,png_get_rowbytes) PNGARG((png_structp png_ptr,
|
|
|
2217 |
png_infop info_ptr));
|
|
|
2218 |
|
|
|
2219 |
#if defined(PNG_INFO_IMAGE_SUPPORTED)
|
|
|
2220 |
/* Returns row_pointers, which is an array of pointers to scanlines that was
|
|
|
2221 |
* returned from png_read_png().
|
|
|
2222 |
*/
|
|
|
2223 |
extern PNG_EXPORT(png_bytepp,png_get_rows) PNGARG((png_structp png_ptr,
|
|
|
2224 |
png_infop info_ptr));
|
|
|
2225 |
/* Set row_pointers, which is an array of pointers to scanlines for use
|
|
|
2226 |
* by png_write_png().
|
|
|
2227 |
*/
|
|
|
2228 |
extern PNG_EXPORT(void,png_set_rows) PNGARG((png_structp png_ptr,
|
|
|
2229 |
png_infop info_ptr, png_bytepp row_pointers));
|
|
|
2230 |
#endif
|
|
|
2231 |
|
|
|
2232 |
/* Returns number of color channels in image. */
|
|
|
2233 |
extern PNG_EXPORT(png_byte,png_get_channels) PNGARG((png_structp png_ptr,
|
|
|
2234 |
png_infop info_ptr));
|
|
|
2235 |
|
|
|
2236 |
#ifdef PNG_EASY_ACCESS_SUPPORTED
|
|
|
2237 |
/* Returns image width in pixels. */
|
|
|
2238 |
extern PNG_EXPORT(png_uint_32, png_get_image_width) PNGARG((png_structp
|
|
|
2239 |
png_ptr, png_infop info_ptr));
|
|
|
2240 |
|
|
|
2241 |
/* Returns image height in pixels. */
|
|
|
2242 |
extern PNG_EXPORT(png_uint_32, png_get_image_height) PNGARG((png_structp
|
|
|
2243 |
png_ptr, png_infop info_ptr));
|
|
|
2244 |
|
|
|
2245 |
/* Returns image bit_depth. */
|
|
|
2246 |
extern PNG_EXPORT(png_byte, png_get_bit_depth) PNGARG((png_structp
|
|
|
2247 |
png_ptr, png_infop info_ptr));
|
|
|
2248 |
|
|
|
2249 |
/* Returns image color_type. */
|
|
|
2250 |
extern PNG_EXPORT(png_byte, png_get_color_type) PNGARG((png_structp
|
|
|
2251 |
png_ptr, png_infop info_ptr));
|
|
|
2252 |
|
|
|
2253 |
/* Returns image filter_type. */
|
|
|
2254 |
extern PNG_EXPORT(png_byte, png_get_filter_type) PNGARG((png_structp
|
|
|
2255 |
png_ptr, png_infop info_ptr));
|
|
|
2256 |
|
|
|
2257 |
/* Returns image interlace_type. */
|
|
|
2258 |
extern PNG_EXPORT(png_byte, png_get_interlace_type) PNGARG((png_structp
|
|
|
2259 |
png_ptr, png_infop info_ptr));
|
|
|
2260 |
|
|
|
2261 |
/* Returns image compression_type. */
|
|
|
2262 |
extern PNG_EXPORT(png_byte, png_get_compression_type) PNGARG((png_structp
|
|
|
2263 |
png_ptr, png_infop info_ptr));
|
|
|
2264 |
|
|
|
2265 |
/* Returns image resolution in pixels per meter, from pHYs chunk data. */
|
|
|
2266 |
extern PNG_EXPORT(png_uint_32, png_get_pixels_per_meter) PNGARG((png_structp
|
|
|
2267 |
png_ptr, png_infop info_ptr));
|
|
|
2268 |
extern PNG_EXPORT(png_uint_32, png_get_x_pixels_per_meter) PNGARG((png_structp
|
|
|
2269 |
png_ptr, png_infop info_ptr));
|
|
|
2270 |
extern PNG_EXPORT(png_uint_32, png_get_y_pixels_per_meter) PNGARG((png_structp
|
|
|
2271 |
png_ptr, png_infop info_ptr));
|
|
|
2272 |
|
|
|
2273 |
/* Returns pixel aspect ratio, computed from pHYs chunk data. */
|
|
|
2274 |
#ifdef PNG_FLOATING_POINT_SUPPORTED
|
|
|
2275 |
extern PNG_EXPORT(float, png_get_pixel_aspect_ratio) PNGARG((png_structp
|
|
|
2276 |
png_ptr, png_infop info_ptr));
|
|
|
2277 |
#endif
|
|
|
2278 |
|
|
|
2279 |
/* Returns image x, y offset in pixels or microns, from oFFs chunk data. */
|
|
|
2280 |
extern PNG_EXPORT(png_int_32, png_get_x_offset_pixels) PNGARG((png_structp
|
|
|
2281 |
png_ptr, png_infop info_ptr));
|
|
|
2282 |
extern PNG_EXPORT(png_int_32, png_get_y_offset_pixels) PNGARG((png_structp
|
|
|
2283 |
png_ptr, png_infop info_ptr));
|
|
|
2284 |
extern PNG_EXPORT(png_int_32, png_get_x_offset_microns) PNGARG((png_structp
|
|
|
2285 |
png_ptr, png_infop info_ptr));
|
|
|
2286 |
extern PNG_EXPORT(png_int_32, png_get_y_offset_microns) PNGARG((png_structp
|
|
|
2287 |
png_ptr, png_infop info_ptr));
|
|
|
2288 |
|
|
|
2289 |
#endif /* PNG_EASY_ACCESS_SUPPORTED */
|
|
|
2290 |
|
|
|
2291 |
/* Returns pointer to signature string read from PNG header */
|
|
|
2292 |
extern PNG_EXPORT(png_bytep,png_get_signature) PNGARG((png_structp png_ptr,
|
|
|
2293 |
png_infop info_ptr));
|
|
|
2294 |
|
|
|
2295 |
#if defined(PNG_bKGD_SUPPORTED)
|
|
|
2296 |
extern PNG_EXPORT(png_uint_32,png_get_bKGD) PNGARG((png_structp png_ptr,
|
|
|
2297 |
png_infop info_ptr, png_color_16p *background));
|
|
|
2298 |
#endif
|
|
|
2299 |
|
|
|
2300 |
#if defined(PNG_bKGD_SUPPORTED)
|
|
|
2301 |
extern PNG_EXPORT(void,png_set_bKGD) PNGARG((png_structp png_ptr,
|
|
|
2302 |
png_infop info_ptr, png_color_16p background));
|
|
|
2303 |
#endif
|
|
|
2304 |
|
|
|
2305 |
#if defined(PNG_cHRM_SUPPORTED)
|
|
|
2306 |
#ifdef PNG_FLOATING_POINT_SUPPORTED
|
|
|
2307 |
extern PNG_EXPORT(png_uint_32,png_get_cHRM) PNGARG((png_structp png_ptr,
|
|
|
2308 |
png_infop info_ptr, double *white_x, double *white_y, double *red_x,
|
|
|
2309 |
double *red_y, double *green_x, double *green_y, double *blue_x,
|
|
|
2310 |
double *blue_y));
|
|
|
2311 |
#endif
|
|
|
2312 |
#ifdef PNG_FIXED_POINT_SUPPORTED
|
|
|
2313 |
extern PNG_EXPORT(png_uint_32,png_get_cHRM_fixed) PNGARG((png_structp png_ptr,
|
|
|
2314 |
png_infop info_ptr, png_fixed_point *int_white_x, png_fixed_point
|
|
|
2315 |
*int_white_y, png_fixed_point *int_red_x, png_fixed_point *int_red_y,
|
|
|
2316 |
png_fixed_point *int_green_x, png_fixed_point *int_green_y, png_fixed_point
|
|
|
2317 |
*int_blue_x, png_fixed_point *int_blue_y));
|
|
|
2318 |
#endif
|
|
|
2319 |
#endif
|
|
|
2320 |
|
|
|
2321 |
#if defined(PNG_cHRM_SUPPORTED)
|
|
|
2322 |
#ifdef PNG_FLOATING_POINT_SUPPORTED
|
|
|
2323 |
extern PNG_EXPORT(void,png_set_cHRM) PNGARG((png_structp png_ptr,
|
|
|
2324 |
png_infop info_ptr, double white_x, double white_y, double red_x,
|
|
|
2325 |
double red_y, double green_x, double green_y, double blue_x, double blue_y));
|
|
|
2326 |
#endif
|
|
|
2327 |
#ifdef PNG_FIXED_POINT_SUPPORTED
|
|
|
2328 |
extern PNG_EXPORT(void,png_set_cHRM_fixed) PNGARG((png_structp png_ptr,
|
|
|
2329 |
png_infop info_ptr, png_fixed_point int_white_x, png_fixed_point int_white_y,
|
|
|
2330 |
png_fixed_point int_red_x, png_fixed_point int_red_y, png_fixed_point
|
|
|
2331 |
int_green_x, png_fixed_point int_green_y, png_fixed_point int_blue_x,
|
|
|
2332 |
png_fixed_point int_blue_y));
|
|
|
2333 |
#endif
|
|
|
2334 |
#endif
|
|
|
2335 |
|
|
|
2336 |
#if defined(PNG_gAMA_SUPPORTED)
|
|
|
2337 |
#ifdef PNG_FLOATING_POINT_SUPPORTED
|
|
|
2338 |
extern PNG_EXPORT(png_uint_32,png_get_gAMA) PNGARG((png_structp png_ptr,
|
|
|
2339 |
png_infop info_ptr, double *file_gamma));
|
|
|
2340 |
#endif
|
|
|
2341 |
extern PNG_EXPORT(png_uint_32,png_get_gAMA_fixed) PNGARG((png_structp png_ptr,
|
|
|
2342 |
png_infop info_ptr, png_fixed_point *int_file_gamma));
|
|
|
2343 |
#endif
|
|
|
2344 |
|
|
|
2345 |
#if defined(PNG_gAMA_SUPPORTED)
|
|
|
2346 |
#ifdef PNG_FLOATING_POINT_SUPPORTED
|
|
|
2347 |
extern PNG_EXPORT(void,png_set_gAMA) PNGARG((png_structp png_ptr,
|
|
|
2348 |
png_infop info_ptr, double file_gamma));
|
|
|
2349 |
#endif
|
|
|
2350 |
extern PNG_EXPORT(void,png_set_gAMA_fixed) PNGARG((png_structp png_ptr,
|
|
|
2351 |
png_infop info_ptr, png_fixed_point int_file_gamma));
|
|
|
2352 |
#endif
|
|
|
2353 |
|
|
|
2354 |
#if defined(PNG_hIST_SUPPORTED)
|
|
|
2355 |
extern PNG_EXPORT(png_uint_32,png_get_hIST) PNGARG((png_structp png_ptr,
|
|
|
2356 |
png_infop info_ptr, png_uint_16p *hist));
|
|
|
2357 |
#endif
|
|
|
2358 |
|
|
|
2359 |
#if defined(PNG_hIST_SUPPORTED)
|
|
|
2360 |
extern PNG_EXPORT(void,png_set_hIST) PNGARG((png_structp png_ptr,
|
|
|
2361 |
png_infop info_ptr, png_uint_16p hist));
|
|
|
2362 |
#endif
|
|
|
2363 |
|
|
|
2364 |
extern PNG_EXPORT(png_uint_32,png_get_IHDR) PNGARG((png_structp png_ptr,
|
|
|
2365 |
png_infop info_ptr, png_uint_32 *width, png_uint_32 *height,
|
|
|
2366 |
int *bit_depth, int *color_type, int *interlace_method,
|
|
|
2367 |
int *compression_method, int *filter_method));
|
|
|
2368 |
|
|
|
2369 |
extern PNG_EXPORT(void,png_set_IHDR) PNGARG((png_structp png_ptr,
|
|
|
2370 |
png_infop info_ptr, png_uint_32 width, png_uint_32 height, int bit_depth,
|
|
|
2371 |
int color_type, int interlace_method, int compression_method,
|
|
|
2372 |
int filter_method));
|
|
|
2373 |
|
|
|
2374 |
#if defined(PNG_oFFs_SUPPORTED)
|
|
|
2375 |
extern PNG_EXPORT(png_uint_32,png_get_oFFs) PNGARG((png_structp png_ptr,
|
|
|
2376 |
png_infop info_ptr, png_int_32 *offset_x, png_int_32 *offset_y,
|
|
|
2377 |
int *unit_type));
|
|
|
2378 |
#endif
|
|
|
2379 |
|
|
|
2380 |
#if defined(PNG_oFFs_SUPPORTED)
|
|
|
2381 |
extern PNG_EXPORT(void,png_set_oFFs) PNGARG((png_structp png_ptr,
|
|
|
2382 |
png_infop info_ptr, png_int_32 offset_x, png_int_32 offset_y,
|
|
|
2383 |
int unit_type));
|
|
|
2384 |
#endif
|
|
|
2385 |
|
|
|
2386 |
#if defined(PNG_pCAL_SUPPORTED)
|
|
|
2387 |
extern PNG_EXPORT(png_uint_32,png_get_pCAL) PNGARG((png_structp png_ptr,
|
|
|
2388 |
png_infop info_ptr, png_charp *purpose, png_int_32 *X0, png_int_32 *X1,
|
|
|
2389 |
int *type, int *nparams, png_charp *units, png_charpp *params));
|
|
|
2390 |
#endif
|
|
|
2391 |
|
|
|
2392 |
#if defined(PNG_pCAL_SUPPORTED)
|
|
|
2393 |
extern PNG_EXPORT(void,png_set_pCAL) PNGARG((png_structp png_ptr,
|
|
|
2394 |
png_infop info_ptr, png_charp purpose, png_int_32 X0, png_int_32 X1,
|
|
|
2395 |
int type, int nparams, png_charp units, png_charpp params));
|
|
|
2396 |
#endif
|
|
|
2397 |
|
|
|
2398 |
#if defined(PNG_pHYs_SUPPORTED)
|
|
|
2399 |
extern PNG_EXPORT(png_uint_32,png_get_pHYs) PNGARG((png_structp png_ptr,
|
|
|
2400 |
png_infop info_ptr, png_uint_32 *res_x, png_uint_32 *res_y, int *unit_type));
|
|
|
2401 |
#endif
|
|
|
2402 |
|
|
|
2403 |
#if defined(PNG_pHYs_SUPPORTED)
|
|
|
2404 |
extern PNG_EXPORT(void,png_set_pHYs) PNGARG((png_structp png_ptr,
|
|
|
2405 |
png_infop info_ptr, png_uint_32 res_x, png_uint_32 res_y, int unit_type));
|
|
|
2406 |
#endif
|
|
|
2407 |
|
|
|
2408 |
extern PNG_EXPORT(png_uint_32,png_get_PLTE) PNGARG((png_structp png_ptr,
|
|
|
2409 |
png_infop info_ptr, png_colorp *palette, int *num_palette));
|
|
|
2410 |
|
|
|
2411 |
extern PNG_EXPORT(void,png_set_PLTE) PNGARG((png_structp png_ptr,
|
|
|
2412 |
png_infop info_ptr, png_colorp palette, int num_palette));
|
|
|
2413 |
|
|
|
2414 |
#if defined(PNG_sBIT_SUPPORTED)
|
|
|
2415 |
extern PNG_EXPORT(png_uint_32,png_get_sBIT) PNGARG((png_structp png_ptr,
|
|
|
2416 |
png_infop info_ptr, png_color_8p *sig_bit));
|
|
|
2417 |
#endif
|
|
|
2418 |
|
|
|
2419 |
#if defined(PNG_sBIT_SUPPORTED)
|
|
|
2420 |
extern PNG_EXPORT(void,png_set_sBIT) PNGARG((png_structp png_ptr,
|
|
|
2421 |
png_infop info_ptr, png_color_8p sig_bit));
|
|
|
2422 |
#endif
|
|
|
2423 |
|
|
|
2424 |
#if defined(PNG_sRGB_SUPPORTED)
|
|
|
2425 |
extern PNG_EXPORT(png_uint_32,png_get_sRGB) PNGARG((png_structp png_ptr,
|
|
|
2426 |
png_infop info_ptr, int *intent));
|
|
|
2427 |
#endif
|
|
|
2428 |
|
|
|
2429 |
#if defined(PNG_sRGB_SUPPORTED)
|
|
|
2430 |
extern PNG_EXPORT(void,png_set_sRGB) PNGARG((png_structp png_ptr,
|
|
|
2431 |
png_infop info_ptr, int intent));
|
|
|
2432 |
extern PNG_EXPORT(void,png_set_sRGB_gAMA_and_cHRM) PNGARG((png_structp png_ptr,
|
|
|
2433 |
png_infop info_ptr, int intent));
|
|
|
2434 |
#endif
|
|
|
2435 |
|
|
|
2436 |
#if defined(PNG_iCCP_SUPPORTED)
|
|
|
2437 |
extern PNG_EXPORT(png_uint_32,png_get_iCCP) PNGARG((png_structp png_ptr,
|
|
|
2438 |
png_infop info_ptr, png_charpp name, int *compression_type,
|
|
|
2439 |
png_charpp profile, png_uint_32 *proflen));
|
|
|
2440 |
/* Note to maintainer: profile should be png_bytepp */
|
|
|
2441 |
#endif
|
|
|
2442 |
|
|
|
2443 |
#if defined(PNG_iCCP_SUPPORTED)
|
|
|
2444 |
extern PNG_EXPORT(void,png_set_iCCP) PNGARG((png_structp png_ptr,
|
|
|
2445 |
png_infop info_ptr, png_charp name, int compression_type,
|
|
|
2446 |
png_charp profile, png_uint_32 proflen));
|
|
|
2447 |
/* Note to maintainer: profile should be png_bytep */
|
|
|
2448 |
#endif
|
|
|
2449 |
|
|
|
2450 |
#if defined(PNG_sPLT_SUPPORTED)
|
|
|
2451 |
extern PNG_EXPORT(png_uint_32,png_get_sPLT) PNGARG((png_structp png_ptr,
|
|
|
2452 |
png_infop info_ptr, png_sPLT_tpp entries));
|
|
|
2453 |
#endif
|
|
|
2454 |
|
|
|
2455 |
#if defined(PNG_sPLT_SUPPORTED)
|
|
|
2456 |
extern PNG_EXPORT(void,png_set_sPLT) PNGARG((png_structp png_ptr,
|
|
|
2457 |
png_infop info_ptr, png_sPLT_tp entries, int nentries));
|
|
|
2458 |
#endif
|
|
|
2459 |
|
|
|
2460 |
#if defined(PNG_TEXT_SUPPORTED)
|
|
|
2461 |
/* png_get_text also returns the number of text chunks in *num_text */
|
|
|
2462 |
extern PNG_EXPORT(png_uint_32,png_get_text) PNGARG((png_structp png_ptr,
|
|
|
2463 |
png_infop info_ptr, png_textp *text_ptr, int *num_text));
|
|
|
2464 |
#endif
|
|
|
2465 |
|
|
|
2466 |
/*
|
|
|
2467 |
* Note while png_set_text() will accept a structure whose text,
|
|
|
2468 |
* language, and translated keywords are NULL pointers, the structure
|
|
|
2469 |
* returned by png_get_text will always contain regular
|
|
|
2470 |
* zero-terminated C strings. They might be empty strings but
|
|
|
2471 |
* they will never be NULL pointers.
|
|
|
2472 |
*/
|
|
|
2473 |
|
|
|
2474 |
#if defined(PNG_TEXT_SUPPORTED)
|
|
|
2475 |
extern PNG_EXPORT(void,png_set_text) PNGARG((png_structp png_ptr,
|
|
|
2476 |
png_infop info_ptr, png_textp text_ptr, int num_text));
|
|
|
2477 |
#endif
|
|
|
2478 |
|
|
|
2479 |
#if defined(PNG_tIME_SUPPORTED)
|
|
|
2480 |
extern PNG_EXPORT(png_uint_32,png_get_tIME) PNGARG((png_structp png_ptr,
|
|
|
2481 |
png_infop info_ptr, png_timep *mod_time));
|
|
|
2482 |
#endif
|
|
|
2483 |
|
|
|
2484 |
#if defined(PNG_tIME_SUPPORTED)
|
|
|
2485 |
extern PNG_EXPORT(void,png_set_tIME) PNGARG((png_structp png_ptr,
|
|
|
2486 |
png_infop info_ptr, png_timep mod_time));
|
|
|
2487 |
#endif
|
|
|
2488 |
|
|
|
2489 |
#if defined(PNG_tRNS_SUPPORTED)
|
|
|
2490 |
extern PNG_EXPORT(png_uint_32,png_get_tRNS) PNGARG((png_structp png_ptr,
|
|
|
2491 |
png_infop info_ptr, png_bytep *trans, int *num_trans,
|
|
|
2492 |
png_color_16p *trans_values));
|
|
|
2493 |
#endif
|
|
|
2494 |
|
|
|
2495 |
#if defined(PNG_tRNS_SUPPORTED)
|
|
|
2496 |
extern PNG_EXPORT(void,png_set_tRNS) PNGARG((png_structp png_ptr,
|
|
|
2497 |
png_infop info_ptr, png_bytep trans, int num_trans,
|
|
|
2498 |
png_color_16p trans_values));
|
|
|
2499 |
#endif
|
|
|
2500 |
|
|
|
2501 |
#if defined(PNG_tRNS_SUPPORTED)
|
|
|
2502 |
#endif
|
|
|
2503 |
|
|
|
2504 |
#if defined(PNG_sCAL_SUPPORTED)
|
|
|
2505 |
#ifdef PNG_FLOATING_POINT_SUPPORTED
|
|
|
2506 |
extern PNG_EXPORT(png_uint_32,png_get_sCAL) PNGARG((png_structp png_ptr,
|
|
|
2507 |
png_infop info_ptr, int *unit, double *width, double *height));
|
|
|
2508 |
#else
|
|
|
2509 |
#ifdef PNG_FIXED_POINT_SUPPORTED
|
|
|
2510 |
extern PNG_EXPORT(png_uint_32,png_get_sCAL_s) PNGARG((png_structp png_ptr,
|
|
|
2511 |
png_infop info_ptr, int *unit, png_charpp swidth, png_charpp sheight));
|
|
|
2512 |
#endif
|
|
|
2513 |
#endif
|
|
|
2514 |
#endif /* PNG_sCAL_SUPPORTED */
|
|
|
2515 |
|
|
|
2516 |
#if defined(PNG_sCAL_SUPPORTED)
|
|
|
2517 |
#ifdef PNG_FLOATING_POINT_SUPPORTED
|
|
|
2518 |
extern PNG_EXPORT(void,png_set_sCAL) PNGARG((png_structp png_ptr,
|
|
|
2519 |
png_infop info_ptr, int unit, double width, double height));
|
|
|
2520 |
#else
|
|
|
2521 |
#ifdef PNG_FIXED_POINT_SUPPORTED
|
|
|
2522 |
extern PNG_EXPORT(void,png_set_sCAL_s) PNGARG((png_structp png_ptr,
|
|
|
2523 |
png_infop info_ptr, int unit, png_charp swidth, png_charp sheight));
|
|
|
2524 |
#endif
|
|
|
2525 |
#endif
|
|
|
2526 |
#endif /* PNG_sCAL_SUPPORTED || PNG_WRITE_sCAL_SUPPORTED */
|
|
|
2527 |
|
|
|
2528 |
#ifdef PNG_HANDLE_AS_UNKNOWN_SUPPORTED
|
|
|
2529 |
/* Provide a list of chunks and how they are to be handled, if the built-in
|
|
|
2530 |
handling or default unknown chunk handling is not desired. Any chunks not
|
|
|
2531 |
listed will be handled in the default manner. The IHDR and IEND chunks
|
|
|
2532 |
must not be listed.
|
|
|
2533 |
keep = 0: follow default behaviour
|
|
|
2534 |
= 1: do not keep
|
|
|
2535 |
= 2: keep only if safe-to-copy
|
|
|
2536 |
= 3: keep even if unsafe-to-copy
|
|
|
2537 |
*/
|
|
|
2538 |
extern PNG_EXPORT(void, png_set_keep_unknown_chunks) PNGARG((png_structp
|
|
|
2539 |
png_ptr, int keep, png_bytep chunk_list, int num_chunks));
|
|
|
2540 |
PNG_EXPORT(int,png_handle_as_unknown) PNGARG((png_structp png_ptr, png_bytep
|
|
|
2541 |
chunk_name));
|
|
|
2542 |
#endif
|
|
|
2543 |
#if defined(PNG_UNKNOWN_CHUNKS_SUPPORTED)
|
|
|
2544 |
extern PNG_EXPORT(void, png_set_unknown_chunks) PNGARG((png_structp png_ptr,
|
|
|
2545 |
png_infop info_ptr, png_unknown_chunkp unknowns, int num_unknowns));
|
|
|
2546 |
extern PNG_EXPORT(void, png_set_unknown_chunk_location)
|
|
|
2547 |
PNGARG((png_structp png_ptr, png_infop info_ptr, int chunk, int location));
|
|
|
2548 |
extern PNG_EXPORT(png_uint_32,png_get_unknown_chunks) PNGARG((png_structp
|
|
|
2549 |
png_ptr, png_infop info_ptr, png_unknown_chunkpp entries));
|
|
|
2550 |
#endif
|
|
|
2551 |
|
|
|
2552 |
/* Png_free_data() will turn off the "valid" flag for anything it frees.
|
|
|
2553 |
* If you need to turn it off for a chunk that your application has freed,
|
|
|
2554 |
* you can use png_set_invalid(png_ptr, info_ptr, PNG_INFO_CHNK);
|
|
|
2555 |
*/
|
|
|
2556 |
extern PNG_EXPORT(void, png_set_invalid) PNGARG((png_structp png_ptr,
|
|
|
2557 |
png_infop info_ptr, int mask));
|
|
|
2558 |
|
|
|
2559 |
#if defined(PNG_INFO_IMAGE_SUPPORTED)
|
|
|
2560 |
/* The "params" pointer is currently not used and is for future expansion. */
|
|
|
2561 |
extern PNG_EXPORT(void, png_read_png) PNGARG((png_structp png_ptr,
|
|
|
2562 |
png_infop info_ptr,
|
|
|
2563 |
int transforms,
|
|
|
2564 |
png_voidp params));
|
|
|
2565 |
extern PNG_EXPORT(void, png_write_png) PNGARG((png_structp png_ptr,
|
|
|
2566 |
png_infop info_ptr,
|
|
|
2567 |
int transforms,
|
|
|
2568 |
png_voidp params));
|
|
|
2569 |
#endif
|
|
|
2570 |
|
|
|
2571 |
/* Define PNG_DEBUG at compile time for debugging information. Higher
|
|
|
2572 |
* numbers for PNG_DEBUG mean more debugging information. This has
|
|
|
2573 |
* only been added since version 0.95 so it is not implemented throughout
|
|
|
2574 |
* libpng yet, but more support will be added as needed.
|
|
|
2575 |
*/
|
|
|
2576 |
#ifdef PNG_DEBUG
|
|
|
2577 |
#if (PNG_DEBUG > 0)
|
|
|
2578 |
#if !defined(PNG_DEBUG_FILE) && defined(_MSC_VER)
|
|
|
2579 |
#include <crtdbg.h>
|
|
|
2580 |
#if (PNG_DEBUG > 1)
|
|
|
2581 |
#ifndef _DEBUG
|
|
|
2582 |
# define _DEBUG
|
|
|
2583 |
#endif
|
|
|
2584 |
#ifndef png_debug
|
|
|
2585 |
#define png_debug(l,m) _RPT0(_CRT_WARN,m PNG_STRING_NEWLINE)
|
|
|
2586 |
#endif
|
|
|
2587 |
#ifndef png_debug1
|
|
|
2588 |
#define png_debug1(l,m,p1) _RPT1(_CRT_WARN,m PNG_STRING_NEWLINE,p1)
|
|
|
2589 |
#endif
|
|
|
2590 |
#ifndef png_debug2
|
|
|
2591 |
#define png_debug2(l,m,p1,p2) _RPT2(_CRT_WARN,m PNG_STRING_NEWLINE,p1,p2)
|
|
|
2592 |
#endif
|
|
|
2593 |
#endif
|
|
|
2594 |
#else /* PNG_DEBUG_FILE || !_MSC_VER */
|
|
|
2595 |
#ifndef PNG_DEBUG_FILE
|
|
|
2596 |
#define PNG_DEBUG_FILE stderr
|
|
|
2597 |
#endif /* PNG_DEBUG_FILE */
|
|
|
2598 |
|
|
|
2599 |
#if (PNG_DEBUG > 1)
|
|
|
2600 |
/* Note: ["%s"m PNG_STRING_NEWLINE] probably does not work on non-ISO
|
|
|
2601 |
* compilers.
|
|
|
2602 |
*/
|
|
|
2603 |
# ifdef __STDC__
|
|
|
2604 |
# ifndef png_debug
|
|
|
2605 |
# define png_debug(l,m) \
|
|
|
2606 |
{ \
|
|
|
2607 |
int num_tabs=l; \
|
|
|
2608 |
fprintf(PNG_DEBUG_FILE,"%s"m PNG_STRING_NEWLINE,(num_tabs==1 ? "\t" : \
|
|
|
2609 |
(num_tabs==2 ? "\t\t":(num_tabs>2 ? "\t\t\t":"")))); \
|
|
|
2610 |
}
|
|
|
2611 |
# endif
|
|
|
2612 |
# ifndef png_debug1
|
|
|
2613 |
# define png_debug1(l,m,p1) \
|
|
|
2614 |
{ \
|
|
|
2615 |
int num_tabs=l; \
|
|
|
2616 |
fprintf(PNG_DEBUG_FILE,"%s"m PNG_STRING_NEWLINE,(num_tabs==1 ? "\t" : \
|
|
|
2617 |
(num_tabs==2 ? "\t\t":(num_tabs>2 ? "\t\t\t":""))),p1); \
|
|
|
2618 |
}
|
|
|
2619 |
# endif
|
|
|
2620 |
# ifndef png_debug2
|
|
|
2621 |
# define png_debug2(l,m,p1,p2) \
|
|
|
2622 |
{ \
|
|
|
2623 |
int num_tabs=l; \
|
|
|
2624 |
fprintf(PNG_DEBUG_FILE,"%s"m PNG_STRING_NEWLINE,(num_tabs==1 ? "\t" : \
|
|
|
2625 |
(num_tabs==2 ? "\t\t":(num_tabs>2 ? "\t\t\t":""))),p1,p2); \
|
|
|
2626 |
}
|
|
|
2627 |
# endif
|
|
|
2628 |
# else /* __STDC __ */
|
|
|
2629 |
# ifndef png_debug
|
|
|
2630 |
# define png_debug(l,m) \
|
|
|
2631 |
{ \
|
|
|
2632 |
int num_tabs=l; \
|
|
|
2633 |
char format[256]; \
|
|
|
2634 |
snprintf(format,256,"%s%s%s",(num_tabs==1 ? "\t" : \
|
|
|
2635 |
(num_tabs==2 ? "\t\t":(num_tabs>2 ? "\t\t\t":""))), \
|
|
|
2636 |
m,PNG_STRING_NEWLINE); \
|
|
|
2637 |
fprintf(PNG_DEBUG_FILE,format); \
|
|
|
2638 |
}
|
|
|
2639 |
# endif
|
|
|
2640 |
# ifndef png_debug1
|
|
|
2641 |
# define png_debug1(l,m,p1) \
|
|
|
2642 |
{ \
|
|
|
2643 |
int num_tabs=l; \
|
|
|
2644 |
char format[256]; \
|
|
|
2645 |
snprintf(format,256,"%s%s%s",(num_tabs==1 ? "\t" : \
|
|
|
2646 |
(num_tabs==2 ? "\t\t":(num_tabs>2 ? "\t\t\t":""))), \
|
|
|
2647 |
m,PNG_STRING_NEWLINE); \
|
|
|
2648 |
fprintf(PNG_DEBUG_FILE,format,p1); \
|
|
|
2649 |
}
|
|
|
2650 |
# endif
|
|
|
2651 |
# ifndef png_debug2
|
|
|
2652 |
# define png_debug2(l,m,p1,p2) \
|
|
|
2653 |
{ \
|
|
|
2654 |
int num_tabs=l; \
|
|
|
2655 |
char format[256]; \
|
|
|
2656 |
snprintf(format,256,"%s%s%s",(num_tabs==1 ? "\t" : \
|
|
|
2657 |
(num_tabs==2 ? "\t\t":(num_tabs>2 ? "\t\t\t":""))), \
|
|
|
2658 |
m,PNG_STRING_NEWLINE); \
|
|
|
2659 |
fprintf(PNG_DEBUG_FILE,format,p1,p2); \
|
|
|
2660 |
}
|
|
|
2661 |
# endif
|
|
|
2662 |
# endif /* __STDC __ */
|
|
|
2663 |
#endif /* (PNG_DEBUG > 1) */
|
|
|
2664 |
|
|
|
2665 |
#endif /* _MSC_VER */
|
|
|
2666 |
#endif /* (PNG_DEBUG > 0) */
|
|
|
2667 |
#endif /* PNG_DEBUG */
|
|
|
2668 |
#ifndef png_debug
|
|
|
2669 |
#define png_debug(l, m)
|
|
|
2670 |
#endif
|
|
|
2671 |
#ifndef png_debug1
|
|
|
2672 |
#define png_debug1(l, m, p1)
|
|
|
2673 |
#endif
|
|
|
2674 |
#ifndef png_debug2
|
|
|
2675 |
#define png_debug2(l, m, p1, p2)
|
|
|
2676 |
#endif
|
|
|
2677 |
|
|
|
2678 |
extern PNG_EXPORT(png_charp,png_get_copyright) PNGARG((png_structp png_ptr));
|
|
|
2679 |
extern PNG_EXPORT(png_charp,png_get_header_ver) PNGARG((png_structp png_ptr));
|
|
|
2680 |
extern PNG_EXPORT(png_charp,png_get_header_version) PNGARG((png_structp png_ptr));
|
|
|
2681 |
extern PNG_EXPORT(png_charp,png_get_libpng_ver) PNGARG((png_structp png_ptr));
|
|
|
2682 |
|
|
|
2683 |
#ifdef PNG_MNG_FEATURES_SUPPORTED
|
|
|
2684 |
extern PNG_EXPORT(png_uint_32,png_permit_mng_features) PNGARG((png_structp
|
|
|
2685 |
png_ptr, png_uint_32 mng_features_permitted));
|
|
|
2686 |
#endif
|
|
|
2687 |
|
|
|
2688 |
/* For use in png_set_keep_unknown, added to version 1.2.6 */
|
|
|
2689 |
#define PNG_HANDLE_CHUNK_AS_DEFAULT 0
|
|
|
2690 |
#define PNG_HANDLE_CHUNK_NEVER 1
|
|
|
2691 |
#define PNG_HANDLE_CHUNK_IF_SAFE 2
|
|
|
2692 |
#define PNG_HANDLE_CHUNK_ALWAYS 3
|
|
|
2693 |
|
|
|
2694 |
/* Added to version 1.2.0 */
|
|
|
2695 |
#if defined(PNG_ASSEMBLER_CODE_SUPPORTED)
|
|
|
2696 |
#if defined(PNG_MMX_CODE_SUPPORTED)
|
|
|
2697 |
#define PNG_ASM_FLAG_MMX_SUPPORT_COMPILED 0x01 /* not user-settable */
|
|
|
2698 |
#define PNG_ASM_FLAG_MMX_SUPPORT_IN_CPU 0x02 /* not user-settable */
|
|
|
2699 |
#define PNG_ASM_FLAG_MMX_READ_COMBINE_ROW 0x04
|
|
|
2700 |
#define PNG_ASM_FLAG_MMX_READ_INTERLACE 0x08
|
|
|
2701 |
#define PNG_ASM_FLAG_MMX_READ_FILTER_SUB 0x10
|
|
|
2702 |
#define PNG_ASM_FLAG_MMX_READ_FILTER_UP 0x20
|
|
|
2703 |
#define PNG_ASM_FLAG_MMX_READ_FILTER_AVG 0x40
|
|
|
2704 |
#define PNG_ASM_FLAG_MMX_READ_FILTER_PAETH 0x80
|
|
|
2705 |
#define PNG_ASM_FLAGS_INITIALIZED 0x80000000 /* not user-settable */
|
|
|
2706 |
|
|
|
2707 |
#define PNG_MMX_READ_FLAGS ( PNG_ASM_FLAG_MMX_READ_COMBINE_ROW \
|
|
|
2708 |
| PNG_ASM_FLAG_MMX_READ_INTERLACE \
|
|
|
2709 |
| PNG_ASM_FLAG_MMX_READ_FILTER_SUB \
|
|
|
2710 |
| PNG_ASM_FLAG_MMX_READ_FILTER_UP \
|
|
|
2711 |
| PNG_ASM_FLAG_MMX_READ_FILTER_AVG \
|
|
|
2712 |
| PNG_ASM_FLAG_MMX_READ_FILTER_PAETH )
|
|
|
2713 |
#define PNG_MMX_WRITE_FLAGS ( 0 )
|
|
|
2714 |
|
|
|
2715 |
#define PNG_MMX_FLAGS ( PNG_ASM_FLAG_MMX_SUPPORT_COMPILED \
|
|
|
2716 |
| PNG_ASM_FLAG_MMX_SUPPORT_IN_CPU \
|
|
|
2717 |
| PNG_MMX_READ_FLAGS \
|
|
|
2718 |
| PNG_MMX_WRITE_FLAGS )
|
|
|
2719 |
|
|
|
2720 |
#define PNG_SELECT_READ 1
|
|
|
2721 |
#define PNG_SELECT_WRITE 2
|
|
|
2722 |
#endif /* PNG_MMX_CODE_SUPPORTED */
|
|
|
2723 |
|
|
|
2724 |
#if !defined(PNG_1_0_X)
|
|
|
2725 |
/* pngget.c */
|
|
|
2726 |
extern PNG_EXPORT(png_uint_32,png_get_mmx_flagmask)
|
|
|
2727 |
PNGARG((int flag_select, int *compilerID));
|
|
|
2728 |
|
|
|
2729 |
/* pngget.c */
|
|
|
2730 |
extern PNG_EXPORT(png_uint_32,png_get_asm_flagmask)
|
|
|
2731 |
PNGARG((int flag_select));
|
|
|
2732 |
|
|
|
2733 |
/* pngget.c */
|
|
|
2734 |
extern PNG_EXPORT(png_uint_32,png_get_asm_flags)
|
|
|
2735 |
PNGARG((png_structp png_ptr));
|
|
|
2736 |
|
|
|
2737 |
/* pngget.c */
|
|
|
2738 |
extern PNG_EXPORT(png_byte,png_get_mmx_bitdepth_threshold)
|
|
|
2739 |
PNGARG((png_structp png_ptr));
|
|
|
2740 |
|
|
|
2741 |
/* pngget.c */
|
|
|
2742 |
extern PNG_EXPORT(png_uint_32,png_get_mmx_rowbytes_threshold)
|
|
|
2743 |
PNGARG((png_structp png_ptr));
|
|
|
2744 |
|
|
|
2745 |
/* pngset.c */
|
|
|
2746 |
extern PNG_EXPORT(void,png_set_asm_flags)
|
|
|
2747 |
PNGARG((png_structp png_ptr, png_uint_32 asm_flags));
|
|
|
2748 |
|
|
|
2749 |
/* pngset.c */
|
|
|
2750 |
extern PNG_EXPORT(void,png_set_mmx_thresholds)
|
|
|
2751 |
PNGARG((png_structp png_ptr, png_byte mmx_bitdepth_threshold,
|
|
|
2752 |
png_uint_32 mmx_rowbytes_threshold));
|
|
|
2753 |
|
|
|
2754 |
#endif /* PNG_1_0_X */
|
|
|
2755 |
|
|
|
2756 |
#if !defined(PNG_1_0_X)
|
|
|
2757 |
/* png.c, pnggccrd.c, or pngvcrd.c */
|
|
|
2758 |
extern PNG_EXPORT(int,png_mmx_support) PNGARG((void));
|
|
|
2759 |
#endif /* PNG_1_0_X */
|
|
|
2760 |
#endif /* PNG_ASSEMBLER_CODE_SUPPORTED */
|
|
|
2761 |
|
|
|
2762 |
/* Strip the prepended error numbers ("#nnn ") from error and warning
|
|
|
2763 |
* messages before passing them to the error or warning handler.
|
|
|
2764 |
*/
|
|
|
2765 |
#ifdef PNG_ERROR_NUMBERS_SUPPORTED
|
|
|
2766 |
extern PNG_EXPORT(void,png_set_strip_error_numbers) PNGARG((png_structp
|
|
|
2767 |
png_ptr, png_uint_32 strip_mode));
|
|
|
2768 |
#endif
|
|
|
2769 |
|
|
|
2770 |
/* Added at libpng-1.2.6 */
|
|
|
2771 |
#ifdef PNG_SET_USER_LIMITS_SUPPORTED
|
|
|
2772 |
extern PNG_EXPORT(void,png_set_user_limits) PNGARG((png_structp
|
|
|
2773 |
png_ptr, png_uint_32 user_width_max, png_uint_32 user_height_max));
|
|
|
2774 |
extern PNG_EXPORT(png_uint_32,png_get_user_width_max) PNGARG((png_structp
|
|
|
2775 |
png_ptr));
|
|
|
2776 |
extern PNG_EXPORT(png_uint_32,png_get_user_height_max) PNGARG((png_structp
|
|
|
2777 |
png_ptr));
|
|
|
2778 |
#endif
|
|
|
2779 |
|
|
|
2780 |
|
|
|
2781 |
/* Maintainer: Put new public prototypes here ^, in libpng.3, and in
|
|
|
2782 |
* project defs
|
|
|
2783 |
*/
|
|
|
2784 |
|
|
|
2785 |
#ifdef PNG_READ_COMPOSITE_NODIV_SUPPORTED
|
|
|
2786 |
/* With these routines we avoid an integer divide, which will be slower on
|
|
|
2787 |
* most machines. However, it does take more operations than the corresponding
|
|
|
2788 |
* divide method, so it may be slower on a few RISC systems. There are two
|
|
|
2789 |
* shifts (by 8 or 16 bits) and an addition, versus a single integer divide.
|
|
|
2790 |
*
|
|
|
2791 |
* Note that the rounding factors are NOT supposed to be the same! 128 and
|
|
|
2792 |
* 32768 are correct for the NODIV code; 127 and 32767 are correct for the
|
|
|
2793 |
* standard method.
|
|
|
2794 |
*
|
|
|
2795 |
* [Optimized code by Greg Roelofs and Mark Adler...blame us for bugs. :-) ]
|
|
|
2796 |
*/
|
|
|
2797 |
|
|
|
2798 |
/* fg and bg should be in `gamma 1.0' space; alpha is the opacity */
|
|
|
2799 |
|
|
|
2800 |
# define png_composite(composite, fg, alpha, bg) \
|
|
|
2801 |
{ png_uint_16 temp = (png_uint_16)((png_uint_16)(fg) * (png_uint_16)(alpha) \
|
|
|
2802 |
+ (png_uint_16)(bg)*(png_uint_16)(255 - \
|
|
|
2803 |
(png_uint_16)(alpha)) + (png_uint_16)128); \
|
|
|
2804 |
(composite) = (png_byte)((temp + (temp >> 8)) >> 8); }
|
|
|
2805 |
|
|
|
2806 |
# define png_composite_16(composite, fg, alpha, bg) \
|
|
|
2807 |
{ png_uint_32 temp = (png_uint_32)((png_uint_32)(fg) * (png_uint_32)(alpha) \
|
|
|
2808 |
+ (png_uint_32)(bg)*(png_uint_32)(65535L - \
|
|
|
2809 |
(png_uint_32)(alpha)) + (png_uint_32)32768L); \
|
|
|
2810 |
(composite) = (png_uint_16)((temp + (temp >> 16)) >> 16); }
|
|
|
2811 |
|
|
|
2812 |
#else /* Standard method using integer division */
|
|
|
2813 |
|
|
|
2814 |
# define png_composite(composite, fg, alpha, bg) \
|
|
|
2815 |
(composite) = (png_byte)(((png_uint_16)(fg) * (png_uint_16)(alpha) + \
|
|
|
2816 |
(png_uint_16)(bg) * (png_uint_16)(255 - (png_uint_16)(alpha)) + \
|
|
|
2817 |
(png_uint_16)127) / 255)
|
|
|
2818 |
|
|
|
2819 |
# define png_composite_16(composite, fg, alpha, bg) \
|
|
|
2820 |
(composite) = (png_uint_16)(((png_uint_32)(fg) * (png_uint_32)(alpha) + \
|
|
|
2821 |
(png_uint_32)(bg)*(png_uint_32)(65535L - (png_uint_32)(alpha)) + \
|
|
|
2822 |
(png_uint_32)32767) / (png_uint_32)65535L)
|
|
|
2823 |
|
|
|
2824 |
#endif /* PNG_READ_COMPOSITE_NODIV_SUPPORTED */
|
|
|
2825 |
|
|
|
2826 |
/* Inline macros to do direct reads of bytes from the input buffer. These
|
|
|
2827 |
* require that you are using an architecture that uses PNG byte ordering
|
|
|
2828 |
* (MSB first) and supports unaligned data storage. I think that PowerPC
|
|
|
2829 |
* in big-endian mode and 680x0 are the only ones that will support this.
|
|
|
2830 |
* The x86 line of processors definitely do not. The png_get_int_32()
|
|
|
2831 |
* routine also assumes we are using two's complement format for negative
|
|
|
2832 |
* values, which is almost certainly true.
|
|
|
2833 |
*/
|
|
|
2834 |
#if defined(PNG_READ_BIG_ENDIAN_SUPPORTED)
|
|
|
2835 |
# define png_get_uint_32(buf) ( *((png_uint_32p) (buf)))
|
|
|
2836 |
# define png_get_uint_16(buf) ( *((png_uint_16p) (buf)))
|
|
|
2837 |
# define png_get_int_32(buf) ( *((png_int_32p) (buf)))
|
|
|
2838 |
#else
|
|
|
2839 |
extern PNG_EXPORT(png_uint_32,png_get_uint_32) PNGARG((png_bytep buf));
|
|
|
2840 |
extern PNG_EXPORT(png_uint_16,png_get_uint_16) PNGARG((png_bytep buf));
|
|
|
2841 |
extern PNG_EXPORT(png_int_32,png_get_int_32) PNGARG((png_bytep buf));
|
|
|
2842 |
#endif /* !PNG_READ_BIG_ENDIAN_SUPPORTED */
|
|
|
2843 |
extern PNG_EXPORT(png_uint_32,png_get_uint_31)
|
|
|
2844 |
PNGARG((png_structp png_ptr, png_bytep buf));
|
|
|
2845 |
/* No png_get_int_16 -- may be added if there's a real need for it. */
|
|
|
2846 |
|
|
|
2847 |
/* Place a 32-bit number into a buffer in PNG byte order (big-endian).
|
|
|
2848 |
*/
|
|
|
2849 |
extern PNG_EXPORT(void,png_save_uint_32)
|
|
|
2850 |
PNGARG((png_bytep buf, png_uint_32 i));
|
|
|
2851 |
extern PNG_EXPORT(void,png_save_int_32)
|
|
|
2852 |
PNGARG((png_bytep buf, png_int_32 i));
|
|
|
2853 |
|
|
|
2854 |
/* Place a 16-bit number into a buffer in PNG byte order.
|
|
|
2855 |
* The parameter is declared unsigned int, not png_uint_16,
|
|
|
2856 |
* just to avoid potential problems on pre-ANSI C compilers.
|
|
|
2857 |
*/
|
|
|
2858 |
extern PNG_EXPORT(void,png_save_uint_16)
|
|
|
2859 |
PNGARG((png_bytep buf, unsigned int i));
|
|
|
2860 |
/* No png_save_int_16 -- may be added if there's a real need for it. */
|
|
|
2861 |
|
|
|
2862 |
/* ************************************************************************* */
|
|
|
2863 |
|
|
|
2864 |
/* These next functions are used internally in the code. They generally
|
|
|
2865 |
* shouldn't be used unless you are writing code to add or replace some
|
|
|
2866 |
* functionality in libpng. More information about most functions can
|
|
|
2867 |
* be found in the files where the functions are located.
|
|
|
2868 |
*/
|
|
|
2869 |
|
|
|
2870 |
|
|
|
2871 |
/* Various modes of operation, that are visible to applications because
|
|
|
2872 |
* they are used for unknown chunk location.
|
|
|
2873 |
*/
|
|
|
2874 |
#define PNG_HAVE_IHDR 0x01
|
|
|
2875 |
#define PNG_HAVE_PLTE 0x02
|
|
|
2876 |
#define PNG_HAVE_IDAT 0x04
|
|
|
2877 |
#define PNG_AFTER_IDAT 0x08 /* Have complete zlib datastream */
|
|
|
2878 |
#define PNG_HAVE_IEND 0x10
|
|
|
2879 |
|
|
|
2880 |
#if defined(PNG_INTERNAL)
|
|
|
2881 |
|
|
|
2882 |
/* More modes of operation. Note that after an init, mode is set to
|
|
|
2883 |
* zero automatically when the structure is created.
|
|
|
2884 |
*/
|
|
|
2885 |
#define PNG_HAVE_gAMA 0x20
|
|
|
2886 |
#define PNG_HAVE_cHRM 0x40
|
|
|
2887 |
#define PNG_HAVE_sRGB 0x80
|
|
|
2888 |
#define PNG_HAVE_CHUNK_HEADER 0x100
|
|
|
2889 |
#define PNG_WROTE_tIME 0x200
|
|
|
2890 |
#define PNG_WROTE_INFO_BEFORE_PLTE 0x400
|
|
|
2891 |
#define PNG_BACKGROUND_IS_GRAY 0x800
|
|
|
2892 |
#define PNG_HAVE_PNG_SIGNATURE 0x1000
|
|
|
2893 |
#define PNG_HAVE_CHUNK_AFTER_IDAT 0x2000 /* Have another chunk after IDAT */
|
|
|
2894 |
|
|
|
2895 |
/* Flags for the transformations the PNG library does on the image data */
|
|
|
2896 |
#define PNG_BGR 0x0001
|
|
|
2897 |
#define PNG_INTERLACE 0x0002
|
|
|
2898 |
#define PNG_PACK 0x0004
|
|
|
2899 |
#define PNG_SHIFT 0x0008
|
|
|
2900 |
#define PNG_SWAP_BYTES 0x0010
|
|
|
2901 |
#define PNG_INVERT_MONO 0x0020
|
|
|
2902 |
#define PNG_DITHER 0x0040
|
|
|
2903 |
#define PNG_BACKGROUND 0x0080
|
|
|
2904 |
#define PNG_BACKGROUND_EXPAND 0x0100
|
|
|
2905 |
/* 0x0200 unused */
|
|
|
2906 |
#define PNG_16_TO_8 0x0400
|
|
|
2907 |
#define PNG_RGBA 0x0800
|
|
|
2908 |
#define PNG_EXPAND 0x1000
|
|
|
2909 |
#define PNG_GAMMA 0x2000
|
|
|
2910 |
#define PNG_GRAY_TO_RGB 0x4000
|
|
|
2911 |
#define PNG_FILLER 0x8000L
|
|
|
2912 |
#define PNG_PACKSWAP 0x10000L
|
|
|
2913 |
#define PNG_SWAP_ALPHA 0x20000L
|
|
|
2914 |
#define PNG_STRIP_ALPHA 0x40000L
|
|
|
2915 |
#define PNG_INVERT_ALPHA 0x80000L
|
|
|
2916 |
#define PNG_USER_TRANSFORM 0x100000L
|
|
|
2917 |
#define PNG_RGB_TO_GRAY_ERR 0x200000L
|
|
|
2918 |
#define PNG_RGB_TO_GRAY_WARN 0x400000L
|
|
|
2919 |
#define PNG_RGB_TO_GRAY 0x600000L /* two bits, RGB_TO_GRAY_ERR|WARN */
|
|
|
2920 |
/* 0x800000L Unused */
|
|
|
2921 |
#define PNG_ADD_ALPHA 0x1000000L /* Added to libpng-1.2.7 */
|
|
|
2922 |
#define PNG_EXPAND_tRNS 0x2000000L /* Added to libpng-1.2.9 */
|
|
|
2923 |
/* 0x4000000L unused */
|
|
|
2924 |
/* 0x8000000L unused */
|
|
|
2925 |
/* 0x10000000L unused */
|
|
|
2926 |
/* 0x20000000L unused */
|
|
|
2927 |
/* 0x40000000L unused */
|
|
|
2928 |
|
|
|
2929 |
/* Flags for png_create_struct */
|
|
|
2930 |
#define PNG_STRUCT_PNG 0x0001
|
|
|
2931 |
#define PNG_STRUCT_INFO 0x0002
|
|
|
2932 |
|
|
|
2933 |
/* Scaling factor for filter heuristic weighting calculations */
|
|
|
2934 |
#define PNG_WEIGHT_SHIFT 8
|
|
|
2935 |
#define PNG_WEIGHT_FACTOR (1<<(PNG_WEIGHT_SHIFT))
|
|
|
2936 |
#define PNG_COST_SHIFT 3
|
|
|
2937 |
#define PNG_COST_FACTOR (1<<(PNG_COST_SHIFT))
|
|
|
2938 |
|
|
|
2939 |
/* Flags for the png_ptr->flags rather than declaring a byte for each one */
|
|
|
2940 |
#define PNG_FLAG_ZLIB_CUSTOM_STRATEGY 0x0001
|
|
|
2941 |
#define PNG_FLAG_ZLIB_CUSTOM_LEVEL 0x0002
|
|
|
2942 |
#define PNG_FLAG_ZLIB_CUSTOM_MEM_LEVEL 0x0004
|
|
|
2943 |
#define PNG_FLAG_ZLIB_CUSTOM_WINDOW_BITS 0x0008
|
|
|
2944 |
#define PNG_FLAG_ZLIB_CUSTOM_METHOD 0x0010
|
|
|
2945 |
#define PNG_FLAG_ZLIB_FINISHED 0x0020
|
|
|
2946 |
#define PNG_FLAG_ROW_INIT 0x0040
|
|
|
2947 |
#define PNG_FLAG_FILLER_AFTER 0x0080
|
|
|
2948 |
#define PNG_FLAG_CRC_ANCILLARY_USE 0x0100
|
|
|
2949 |
#define PNG_FLAG_CRC_ANCILLARY_NOWARN 0x0200
|
|
|
2950 |
#define PNG_FLAG_CRC_CRITICAL_USE 0x0400
|
|
|
2951 |
#define PNG_FLAG_CRC_CRITICAL_IGNORE 0x0800
|
|
|
2952 |
#define PNG_FLAG_FREE_PLTE 0x1000
|
|
|
2953 |
#define PNG_FLAG_FREE_TRNS 0x2000
|
|
|
2954 |
#define PNG_FLAG_FREE_HIST 0x4000
|
|
|
2955 |
#define PNG_FLAG_KEEP_UNKNOWN_CHUNKS 0x8000L
|
|
|
2956 |
#define PNG_FLAG_KEEP_UNSAFE_CHUNKS 0x10000L
|
|
|
2957 |
#define PNG_FLAG_LIBRARY_MISMATCH 0x20000L
|
|
|
2958 |
#define PNG_FLAG_STRIP_ERROR_NUMBERS 0x40000L
|
|
|
2959 |
#define PNG_FLAG_STRIP_ERROR_TEXT 0x80000L
|
|
|
2960 |
#define PNG_FLAG_MALLOC_NULL_MEM_OK 0x100000L
|
|
|
2961 |
#define PNG_FLAG_ADD_ALPHA 0x200000L /* Added to libpng-1.2.8 */
|
|
|
2962 |
#define PNG_FLAG_STRIP_ALPHA 0x400000L /* Added to libpng-1.2.8 */
|
|
|
2963 |
/* 0x800000L unused */
|
|
|
2964 |
/* 0x1000000L unused */
|
|
|
2965 |
/* 0x2000000L unused */
|
|
|
2966 |
/* 0x4000000L unused */
|
|
|
2967 |
/* 0x8000000L unused */
|
|
|
2968 |
/* 0x10000000L unused */
|
|
|
2969 |
/* 0x20000000L unused */
|
|
|
2970 |
/* 0x40000000L unused */
|
|
|
2971 |
|
|
|
2972 |
#define PNG_FLAG_CRC_ANCILLARY_MASK (PNG_FLAG_CRC_ANCILLARY_USE | \
|
|
|
2973 |
PNG_FLAG_CRC_ANCILLARY_NOWARN)
|
|
|
2974 |
|
|
|
2975 |
#define PNG_FLAG_CRC_CRITICAL_MASK (PNG_FLAG_CRC_CRITICAL_USE | \
|
|
|
2976 |
PNG_FLAG_CRC_CRITICAL_IGNORE)
|
|
|
2977 |
|
|
|
2978 |
#define PNG_FLAG_CRC_MASK (PNG_FLAG_CRC_ANCILLARY_MASK | \
|
|
|
2979 |
PNG_FLAG_CRC_CRITICAL_MASK)
|
|
|
2980 |
|
|
|
2981 |
/* Save typing and make code easier to understand */
|
|
|
2982 |
|
|
|
2983 |
#define PNG_COLOR_DIST(c1, c2) (abs((int)((c1).red) - (int)((c2).red)) + \
|
|
|
2984 |
abs((int)((c1).green) - (int)((c2).green)) + \
|
|
|
2985 |
abs((int)((c1).blue) - (int)((c2).blue)))
|
|
|
2986 |
|
|
|
2987 |
/* Added to libpng-1.2.6 JB */
|
|
|
2988 |
#define PNG_ROWBYTES(pixel_bits, width) \
|
|
|
2989 |
((pixel_bits) >= 8 ? \
|
|
|
2990 |
((width) * (((png_uint_32)(pixel_bits)) >> 3)) : \
|
|
|
2991 |
(( ((width) * ((png_uint_32)(pixel_bits))) + 7) >> 3) )
|
|
|
2992 |
|
|
|
2993 |
/* PNG_OUT_OF_RANGE returns true if value is outside the range
|
|
|
2994 |
* ideal-delta..ideal+delta. Each argument is evaluated twice.
|
|
|
2995 |
* "ideal" and "delta" should be constants, normally simple
|
|
|
2996 |
* integers, "value" a variable. Added to libpng-1.2.6 JB
|
|
|
2997 |
*/
|
|
|
2998 |
#define PNG_OUT_OF_RANGE(value, ideal, delta) \
|
|
|
2999 |
( (value) < (ideal)-(delta) || (value) > (ideal)+(delta) )
|
|
|
3000 |
|
|
|
3001 |
/* Variables declared in png.c - only it needs to define PNG_NO_EXTERN */
|
|
|
3002 |
#if !defined(PNG_NO_EXTERN) || defined(PNG_ALWAYS_EXTERN)
|
|
|
3003 |
/* Place to hold the signature string for a PNG file. */
|
|
|
3004 |
#ifdef PNG_USE_GLOBAL_ARRAYS
|
|
|
3005 |
PNG_EXPORT_VAR (PNG_CONST png_byte FARDATA) png_sig[8];
|
|
|
3006 |
#else
|
|
|
3007 |
#endif
|
|
|
3008 |
#endif /* PNG_NO_EXTERN */
|
|
|
3009 |
|
|
|
3010 |
/* Constant strings for known chunk types. If you need to add a chunk,
|
|
|
3011 |
* define the name here, and add an invocation of the macro in png.c and
|
|
|
3012 |
* wherever it's needed.
|
|
|
3013 |
*/
|
|
|
3014 |
#define PNG_IHDR png_byte png_IHDR[5] = { 73, 72, 68, 82, '\0'}
|
|
|
3015 |
#define PNG_IDAT png_byte png_IDAT[5] = { 73, 68, 65, 84, '\0'}
|
|
|
3016 |
#define PNG_IEND png_byte png_IEND[5] = { 73, 69, 78, 68, '\0'}
|
|
|
3017 |
#define PNG_PLTE png_byte png_PLTE[5] = { 80, 76, 84, 69, '\0'}
|
|
|
3018 |
#define PNG_bKGD png_byte png_bKGD[5] = { 98, 75, 71, 68, '\0'}
|
|
|
3019 |
#define PNG_cHRM png_byte png_cHRM[5] = { 99, 72, 82, 77, '\0'}
|
|
|
3020 |
#define PNG_gAMA png_byte png_gAMA[5] = {103, 65, 77, 65, '\0'}
|
|
|
3021 |
#define PNG_hIST png_byte png_hIST[5] = {104, 73, 83, 84, '\0'}
|
|
|
3022 |
#define PNG_iCCP png_byte png_iCCP[5] = {105, 67, 67, 80, '\0'}
|
|
|
3023 |
#define PNG_iTXt png_byte png_iTXt[5] = {105, 84, 88, 116, '\0'}
|
|
|
3024 |
#define PNG_oFFs png_byte png_oFFs[5] = {111, 70, 70, 115, '\0'}
|
|
|
3025 |
#define PNG_pCAL png_byte png_pCAL[5] = {112, 67, 65, 76, '\0'}
|
|
|
3026 |
#define PNG_sCAL png_byte png_sCAL[5] = {115, 67, 65, 76, '\0'}
|
|
|
3027 |
#define PNG_pHYs png_byte png_pHYs[5] = {112, 72, 89, 115, '\0'}
|
|
|
3028 |
#define PNG_sBIT png_byte png_sBIT[5] = {115, 66, 73, 84, '\0'}
|
|
|
3029 |
#define PNG_sPLT png_byte png_sPLT[5] = {115, 80, 76, 84, '\0'}
|
|
|
3030 |
#define PNG_sRGB png_byte png_sRGB[5] = {115, 82, 71, 66, '\0'}
|
|
|
3031 |
#define PNG_tEXt png_byte png_tEXt[5] = {116, 69, 88, 116, '\0'}
|
|
|
3032 |
#define PNG_tIME png_byte png_tIME[5] = {116, 73, 77, 69, '\0'}
|
|
|
3033 |
#define PNG_tRNS png_byte png_tRNS[5] = {116, 82, 78, 83, '\0'}
|
|
|
3034 |
#define PNG_zTXt png_byte png_zTXt[5] = {122, 84, 88, 116, '\0'}
|
|
|
3035 |
|
|
|
3036 |
#ifdef PNG_USE_GLOBAL_ARRAYS
|
|
|
3037 |
PNG_EXPORT_VAR (png_byte FARDATA) png_IHDR[5];
|
|
|
3038 |
PNG_EXPORT_VAR (png_byte FARDATA) png_IDAT[5];
|
|
|
3039 |
PNG_EXPORT_VAR (png_byte FARDATA) png_IEND[5];
|
|
|
3040 |
PNG_EXPORT_VAR (png_byte FARDATA) png_PLTE[5];
|
|
|
3041 |
PNG_EXPORT_VAR (png_byte FARDATA) png_bKGD[5];
|
|
|
3042 |
PNG_EXPORT_VAR (png_byte FARDATA) png_cHRM[5];
|
|
|
3043 |
PNG_EXPORT_VAR (png_byte FARDATA) png_gAMA[5];
|
|
|
3044 |
PNG_EXPORT_VAR (png_byte FARDATA) png_hIST[5];
|
|
|
3045 |
PNG_EXPORT_VAR (png_byte FARDATA) png_iCCP[5];
|
|
|
3046 |
PNG_EXPORT_VAR (png_byte FARDATA) png_iTXt[5];
|
|
|
3047 |
PNG_EXPORT_VAR (png_byte FARDATA) png_oFFs[5];
|
|
|
3048 |
PNG_EXPORT_VAR (png_byte FARDATA) png_pCAL[5];
|
|
|
3049 |
PNG_EXPORT_VAR (png_byte FARDATA) png_sCAL[5];
|
|
|
3050 |
PNG_EXPORT_VAR (png_byte FARDATA) png_pHYs[5];
|
|
|
3051 |
PNG_EXPORT_VAR (png_byte FARDATA) png_sBIT[5];
|
|
|
3052 |
PNG_EXPORT_VAR (png_byte FARDATA) png_sPLT[5];
|
|
|
3053 |
PNG_EXPORT_VAR (png_byte FARDATA) png_sRGB[5];
|
|
|
3054 |
PNG_EXPORT_VAR (png_byte FARDATA) png_tEXt[5];
|
|
|
3055 |
PNG_EXPORT_VAR (png_byte FARDATA) png_tIME[5];
|
|
|
3056 |
PNG_EXPORT_VAR (png_byte FARDATA) png_tRNS[5];
|
|
|
3057 |
PNG_EXPORT_VAR (png_byte FARDATA) png_zTXt[5];
|
|
|
3058 |
#endif /* PNG_USE_GLOBAL_ARRAYS */
|
|
|
3059 |
|
|
|
3060 |
#if defined(PNG_1_0_X) || defined (PNG_1_2_X)
|
|
|
3061 |
/* Initialize png_ptr struct for reading, and allocate any other memory.
|
|
|
3062 |
* (old interface - DEPRECATED - use png_create_read_struct instead).
|
|
|
3063 |
*/
|
|
|
3064 |
extern PNG_EXPORT(void,png_read_init) PNGARG((png_structp png_ptr));
|
|
|
3065 |
#undef png_read_init
|
|
|
3066 |
#define png_read_init(png_ptr) png_read_init_3(&png_ptr, \
|
|
|
3067 |
PNG_LIBPNG_VER_STRING, png_sizeof(png_struct));
|
|
|
3068 |
#endif
|
|
|
3069 |
|
|
|
3070 |
extern PNG_EXPORT(void,png_read_init_3) PNGARG((png_structpp ptr_ptr,
|
|
|
3071 |
png_const_charp user_png_ver, png_size_t png_struct_size));
|
|
|
3072 |
#if defined(PNG_1_0_X) || defined (PNG_1_2_X)
|
|
|
3073 |
extern PNG_EXPORT(void,png_read_init_2) PNGARG((png_structp png_ptr,
|
|
|
3074 |
png_const_charp user_png_ver, png_size_t png_struct_size, png_size_t
|
|
|
3075 |
png_info_size));
|
|
|
3076 |
#endif
|
|
|
3077 |
|
|
|
3078 |
#if defined(PNG_1_0_X) || defined (PNG_1_2_X)
|
|
|
3079 |
/* Initialize png_ptr struct for writing, and allocate any other memory.
|
|
|
3080 |
* (old interface - DEPRECATED - use png_create_write_struct instead).
|
|
|
3081 |
*/
|
|
|
3082 |
extern PNG_EXPORT(void,png_write_init) PNGARG((png_structp png_ptr));
|
|
|
3083 |
#undef png_write_init
|
|
|
3084 |
#define png_write_init(png_ptr) png_write_init_3(&png_ptr, \
|
|
|
3085 |
PNG_LIBPNG_VER_STRING, png_sizeof(png_struct));
|
|
|
3086 |
#endif
|
|
|
3087 |
|
|
|
3088 |
extern PNG_EXPORT(void,png_write_init_3) PNGARG((png_structpp ptr_ptr,
|
|
|
3089 |
png_const_charp user_png_ver, png_size_t png_struct_size));
|
|
|
3090 |
extern PNG_EXPORT(void,png_write_init_2) PNGARG((png_structp png_ptr,
|
|
|
3091 |
png_const_charp user_png_ver, png_size_t png_struct_size, png_size_t
|
|
|
3092 |
png_info_size));
|
|
|
3093 |
|
|
|
3094 |
/* Allocate memory for an internal libpng struct */
|
|
|
3095 |
PNG_EXTERN png_voidp png_create_struct PNGARG((int type));
|
|
|
3096 |
|
|
|
3097 |
/* Free memory from internal libpng struct */
|
|
|
3098 |
PNG_EXTERN void png_destroy_struct PNGARG((png_voidp struct_ptr));
|
|
|
3099 |
|
|
|
3100 |
PNG_EXTERN png_voidp png_create_struct_2 PNGARG((int type, png_malloc_ptr
|
|
|
3101 |
malloc_fn, png_voidp mem_ptr));
|
|
|
3102 |
PNG_EXTERN void png_destroy_struct_2 PNGARG((png_voidp struct_ptr,
|
|
|
3103 |
png_free_ptr free_fn, png_voidp mem_ptr));
|
|
|
3104 |
|
|
|
3105 |
/* Free any memory that info_ptr points to and reset struct. */
|
|
|
3106 |
PNG_EXTERN void png_info_destroy PNGARG((png_structp png_ptr,
|
|
|
3107 |
png_infop info_ptr));
|
|
|
3108 |
|
|
|
3109 |
#ifndef PNG_1_0_X
|
|
|
3110 |
/* Function to allocate memory for zlib. */
|
|
|
3111 |
PNG_EXTERN voidpf png_zalloc PNGARG((voidpf png_ptr, uInt items, uInt size));
|
|
|
3112 |
|
|
|
3113 |
/* Function to free memory for zlib */
|
|
|
3114 |
PNG_EXTERN void png_zfree PNGARG((voidpf png_ptr, voidpf ptr));
|
|
|
3115 |
|
|
|
3116 |
#ifdef PNG_SIZE_T
|
|
|
3117 |
/* Function to convert a sizeof an item to png_sizeof item */
|
|
|
3118 |
PNG_EXTERN png_size_t PNGAPI png_convert_size PNGARG((size_t size));
|
|
|
3119 |
#endif
|
|
|
3120 |
|
|
|
3121 |
/* Next four functions are used internally as callbacks. PNGAPI is required
|
|
|
3122 |
* but not PNG_EXPORT. PNGAPI added at libpng version 1.2.3.
|
|
|
3123 |
*/
|
|
|
3124 |
|
|
|
3125 |
PNG_EXTERN void PNGAPI png_default_read_data PNGARG((png_structp png_ptr,
|
|
|
3126 |
png_bytep data, png_size_t length));
|
|
|
3127 |
|
|
|
3128 |
#ifdef PNG_PROGRESSIVE_READ_SUPPORTED
|
|
|
3129 |
PNG_EXTERN void PNGAPI png_push_fill_buffer PNGARG((png_structp png_ptr,
|
|
|
3130 |
png_bytep buffer, png_size_t length));
|
|
|
3131 |
#endif
|
|
|
3132 |
|
|
|
3133 |
PNG_EXTERN void PNGAPI png_default_write_data PNGARG((png_structp png_ptr,
|
|
|
3134 |
png_bytep data, png_size_t length));
|
|
|
3135 |
|
|
|
3136 |
#if defined(PNG_WRITE_FLUSH_SUPPORTED)
|
|
|
3137 |
#if !defined(PNG_NO_STDIO)
|
|
|
3138 |
PNG_EXTERN void PNGAPI png_default_flush PNGARG((png_structp png_ptr));
|
|
|
3139 |
#endif
|
|
|
3140 |
#endif
|
|
|
3141 |
#else /* PNG_1_0_X */
|
|
|
3142 |
#ifdef PNG_PROGRESSIVE_READ_SUPPORTED
|
|
|
3143 |
PNG_EXTERN void png_push_fill_buffer PNGARG((png_structp png_ptr,
|
|
|
3144 |
png_bytep buffer, png_size_t length));
|
|
|
3145 |
#endif
|
|
|
3146 |
#endif /* PNG_1_0_X */
|
|
|
3147 |
|
|
|
3148 |
/* Reset the CRC variable */
|
|
|
3149 |
PNG_EXTERN void png_reset_crc PNGARG((png_structp png_ptr));
|
|
|
3150 |
|
|
|
3151 |
/* Write the "data" buffer to whatever output you are using. */
|
|
|
3152 |
PNG_EXTERN void png_write_data PNGARG((png_structp png_ptr, png_bytep data,
|
|
|
3153 |
png_size_t length));
|
|
|
3154 |
|
|
|
3155 |
/* Read data from whatever input you are using into the "data" buffer */
|
|
|
3156 |
PNG_EXTERN void png_read_data PNGARG((png_structp png_ptr, png_bytep data,
|
|
|
3157 |
png_size_t length));
|
|
|
3158 |
|
|
|
3159 |
/* Read bytes into buf, and update png_ptr->crc */
|
|
|
3160 |
PNG_EXTERN void png_crc_read PNGARG((png_structp png_ptr, png_bytep buf,
|
|
|
3161 |
png_size_t length));
|
|
|
3162 |
|
|
|
3163 |
/* Decompress data in a chunk that uses compression */
|
|
|
3164 |
#if defined(PNG_zTXt_SUPPORTED) || defined(PNG_iTXt_SUPPORTED) || \
|
|
|
3165 |
defined(PNG_iCCP_SUPPORTED) || defined(PNG_sPLT_SUPPORTED)
|
|
|
3166 |
PNG_EXTERN void png_decompress_chunk PNGARG((png_structp png_ptr,
|
|
|
3167 |
int comp_type, png_size_t chunklength,
|
|
|
3168 |
png_size_t prefix_length, png_size_t *data_length));
|
|
|
3169 |
#endif
|
|
|
3170 |
|
|
|
3171 |
/* Read "skip" bytes, read the file crc, and (optionally) verify png_ptr->crc */
|
|
|
3172 |
PNG_EXTERN int png_crc_finish PNGARG((png_structp png_ptr, png_uint_32 skip));
|
|
|
3173 |
|
|
|
3174 |
/* Read the CRC from the file and compare it to the libpng calculated CRC */
|
|
|
3175 |
PNG_EXTERN int png_crc_error PNGARG((png_structp png_ptr));
|
|
|
3176 |
|
|
|
3177 |
/* Calculate the CRC over a section of data. Note that we are only
|
|
|
3178 |
* passing a maximum of 64K on systems that have this as a memory limit,
|
|
|
3179 |
* since this is the maximum buffer size we can specify.
|
|
|
3180 |
*/
|
|
|
3181 |
PNG_EXTERN void png_calculate_crc PNGARG((png_structp png_ptr, png_bytep ptr,
|
|
|
3182 |
png_size_t length));
|
|
|
3183 |
|
|
|
3184 |
#if defined(PNG_WRITE_FLUSH_SUPPORTED)
|
|
|
3185 |
PNG_EXTERN void png_flush PNGARG((png_structp png_ptr));
|
|
|
3186 |
#endif
|
|
|
3187 |
|
|
|
3188 |
/* Simple function to write the signature */
|
|
|
3189 |
PNG_EXTERN void png_write_sig PNGARG((png_structp png_ptr));
|
|
|
3190 |
|
|
|
3191 |
/* Write various chunks */
|
|
|
3192 |
|
|
|
3193 |
/* Write the IHDR chunk, and update the png_struct with the necessary
|
|
|
3194 |
* information.
|
|
|
3195 |
*/
|
|
|
3196 |
PNG_EXTERN void png_write_IHDR PNGARG((png_structp png_ptr, png_uint_32 width,
|
|
|
3197 |
png_uint_32 height,
|
|
|
3198 |
int bit_depth, int color_type, int compression_method, int filter_method,
|
|
|
3199 |
int interlace_method));
|
|
|
3200 |
|
|
|
3201 |
PNG_EXTERN void png_write_PLTE PNGARG((png_structp png_ptr, png_colorp palette,
|
|
|
3202 |
png_uint_32 num_pal));
|
|
|
3203 |
|
|
|
3204 |
PNG_EXTERN void png_write_IDAT PNGARG((png_structp png_ptr, png_bytep data,
|
|
|
3205 |
png_size_t length));
|
|
|
3206 |
|
|
|
3207 |
PNG_EXTERN void png_write_IEND PNGARG((png_structp png_ptr));
|
|
|
3208 |
|
|
|
3209 |
#if defined(PNG_WRITE_gAMA_SUPPORTED)
|
|
|
3210 |
#ifdef PNG_FLOATING_POINT_SUPPORTED
|
|
|
3211 |
PNG_EXTERN void png_write_gAMA PNGARG((png_structp png_ptr, double file_gamma));
|
|
|
3212 |
#endif
|
|
|
3213 |
#ifdef PNG_FIXED_POINT_SUPPORTED
|
|
|
3214 |
PNG_EXTERN void png_write_gAMA_fixed PNGARG((png_structp png_ptr, png_fixed_point
|
|
|
3215 |
file_gamma));
|
|
|
3216 |
#endif
|
|
|
3217 |
#endif
|
|
|
3218 |
|
|
|
3219 |
#if defined(PNG_WRITE_sBIT_SUPPORTED)
|
|
|
3220 |
PNG_EXTERN void png_write_sBIT PNGARG((png_structp png_ptr, png_color_8p sbit,
|
|
|
3221 |
int color_type));
|
|
|
3222 |
#endif
|
|
|
3223 |
|
|
|
3224 |
#if defined(PNG_WRITE_cHRM_SUPPORTED)
|
|
|
3225 |
#ifdef PNG_FLOATING_POINT_SUPPORTED
|
|
|
3226 |
PNG_EXTERN void png_write_cHRM PNGARG((png_structp png_ptr,
|
|
|
3227 |
double white_x, double white_y,
|
|
|
3228 |
double red_x, double red_y, double green_x, double green_y,
|
|
|
3229 |
double blue_x, double blue_y));
|
|
|
3230 |
#endif
|
|
|
3231 |
#ifdef PNG_FIXED_POINT_SUPPORTED
|
|
|
3232 |
PNG_EXTERN void png_write_cHRM_fixed PNGARG((png_structp png_ptr,
|
|
|
3233 |
png_fixed_point int_white_x, png_fixed_point int_white_y,
|
|
|
3234 |
png_fixed_point int_red_x, png_fixed_point int_red_y, png_fixed_point
|
|
|
3235 |
int_green_x, png_fixed_point int_green_y, png_fixed_point int_blue_x,
|
|
|
3236 |
png_fixed_point int_blue_y));
|
|
|
3237 |
#endif
|
|
|
3238 |
#endif
|
|
|
3239 |
|
|
|
3240 |
#if defined(PNG_WRITE_sRGB_SUPPORTED)
|
|
|
3241 |
PNG_EXTERN void png_write_sRGB PNGARG((png_structp png_ptr,
|
|
|
3242 |
int intent));
|
|
|
3243 |
#endif
|
|
|
3244 |
|
|
|
3245 |
#if defined(PNG_WRITE_iCCP_SUPPORTED)
|
|
|
3246 |
PNG_EXTERN void png_write_iCCP PNGARG((png_structp png_ptr,
|
|
|
3247 |
png_charp name, int compression_type,
|
|
|
3248 |
png_charp profile, int proflen));
|
|
|
3249 |
/* Note to maintainer: profile should be png_bytep */
|
|
|
3250 |
#endif
|
|
|
3251 |
|
|
|
3252 |
#if defined(PNG_WRITE_sPLT_SUPPORTED)
|
|
|
3253 |
PNG_EXTERN void png_write_sPLT PNGARG((png_structp png_ptr,
|
|
|
3254 |
png_sPLT_tp palette));
|
|
|
3255 |
#endif
|
|
|
3256 |
|
|
|
3257 |
#if defined(PNG_WRITE_tRNS_SUPPORTED)
|
|
|
3258 |
PNG_EXTERN void png_write_tRNS PNGARG((png_structp png_ptr, png_bytep trans,
|
|
|
3259 |
png_color_16p values, int number, int color_type));
|
|
|
3260 |
#endif
|
|
|
3261 |
|
|
|
3262 |
#if defined(PNG_WRITE_bKGD_SUPPORTED)
|
|
|
3263 |
PNG_EXTERN void png_write_bKGD PNGARG((png_structp png_ptr,
|
|
|
3264 |
png_color_16p values, int color_type));
|
|
|
3265 |
#endif
|
|
|
3266 |
|
|
|
3267 |
#if defined(PNG_WRITE_hIST_SUPPORTED)
|
|
|
3268 |
PNG_EXTERN void png_write_hIST PNGARG((png_structp png_ptr, png_uint_16p hist,
|
|
|
3269 |
int num_hist));
|
|
|
3270 |
#endif
|
|
|
3271 |
|
|
|
3272 |
#if defined(PNG_WRITE_TEXT_SUPPORTED) || defined(PNG_WRITE_pCAL_SUPPORTED) || \
|
|
|
3273 |
defined(PNG_WRITE_iCCP_SUPPORTED) || defined(PNG_WRITE_sPLT_SUPPORTED)
|
|
|
3274 |
PNG_EXTERN png_size_t png_check_keyword PNGARG((png_structp png_ptr,
|
|
|
3275 |
png_charp key, png_charpp new_key));
|
|
|
3276 |
#endif
|
|
|
3277 |
|
|
|
3278 |
#if defined(PNG_WRITE_tEXt_SUPPORTED)
|
|
|
3279 |
PNG_EXTERN void png_write_tEXt PNGARG((png_structp png_ptr, png_charp key,
|
|
|
3280 |
png_charp text, png_size_t text_len));
|
|
|
3281 |
#endif
|
|
|
3282 |
|
|
|
3283 |
#if defined(PNG_WRITE_zTXt_SUPPORTED)
|
|
|
3284 |
PNG_EXTERN void png_write_zTXt PNGARG((png_structp png_ptr, png_charp key,
|
|
|
3285 |
png_charp text, png_size_t text_len, int compression));
|
|
|
3286 |
#endif
|
|
|
3287 |
|
|
|
3288 |
#if defined(PNG_WRITE_iTXt_SUPPORTED)
|
|
|
3289 |
PNG_EXTERN void png_write_iTXt PNGARG((png_structp png_ptr,
|
|
|
3290 |
int compression, png_charp key, png_charp lang, png_charp lang_key,
|
|
|
3291 |
png_charp text));
|
|
|
3292 |
#endif
|
|
|
3293 |
|
|
|
3294 |
#if defined(PNG_TEXT_SUPPORTED) /* Added at version 1.0.14 and 1.2.4 */
|
|
|
3295 |
PNG_EXTERN int png_set_text_2 PNGARG((png_structp png_ptr,
|
|
|
3296 |
png_infop info_ptr, png_textp text_ptr, int num_text));
|
|
|
3297 |
#endif
|
|
|
3298 |
|
|
|
3299 |
#if defined(PNG_WRITE_oFFs_SUPPORTED)
|
|
|
3300 |
PNG_EXTERN void png_write_oFFs PNGARG((png_structp png_ptr,
|
|
|
3301 |
png_int_32 x_offset, png_int_32 y_offset, int unit_type));
|
|
|
3302 |
#endif
|
|
|
3303 |
|
|
|
3304 |
#if defined(PNG_WRITE_pCAL_SUPPORTED)
|
|
|
3305 |
PNG_EXTERN void png_write_pCAL PNGARG((png_structp png_ptr, png_charp purpose,
|
|
|
3306 |
png_int_32 X0, png_int_32 X1, int type, int nparams,
|
|
|
3307 |
png_charp units, png_charpp params));
|
|
|
3308 |
#endif
|
|
|
3309 |
|
|
|
3310 |
#if defined(PNG_WRITE_pHYs_SUPPORTED)
|
|
|
3311 |
PNG_EXTERN void png_write_pHYs PNGARG((png_structp png_ptr,
|
|
|
3312 |
png_uint_32 x_pixels_per_unit, png_uint_32 y_pixels_per_unit,
|
|
|
3313 |
int unit_type));
|
|
|
3314 |
#endif
|
|
|
3315 |
|
|
|
3316 |
#if defined(PNG_WRITE_tIME_SUPPORTED)
|
|
|
3317 |
PNG_EXTERN void png_write_tIME PNGARG((png_structp png_ptr,
|
|
|
3318 |
png_timep mod_time));
|
|
|
3319 |
#endif
|
|
|
3320 |
|
|
|
3321 |
#if defined(PNG_WRITE_sCAL_SUPPORTED)
|
|
|
3322 |
#if defined(PNG_FLOATING_POINT_SUPPORTED) && !defined(PNG_NO_STDIO)
|
|
|
3323 |
PNG_EXTERN void png_write_sCAL PNGARG((png_structp png_ptr,
|
|
|
3324 |
int unit, double width, double height));
|
|
|
3325 |
#else
|
|
|
3326 |
#ifdef PNG_FIXED_POINT_SUPPORTED
|
|
|
3327 |
PNG_EXTERN void png_write_sCAL_s PNGARG((png_structp png_ptr,
|
|
|
3328 |
int unit, png_charp width, png_charp height));
|
|
|
3329 |
#endif
|
|
|
3330 |
#endif
|
|
|
3331 |
#endif
|
|
|
3332 |
|
|
|
3333 |
/* Called when finished processing a row of data */
|
|
|
3334 |
PNG_EXTERN void png_write_finish_row PNGARG((png_structp png_ptr));
|
|
|
3335 |
|
|
|
3336 |
/* Internal use only. Called before first row of data */
|
|
|
3337 |
PNG_EXTERN void png_write_start_row PNGARG((png_structp png_ptr));
|
|
|
3338 |
|
|
|
3339 |
#if defined(PNG_READ_GAMMA_SUPPORTED)
|
|
|
3340 |
PNG_EXTERN void png_build_gamma_table PNGARG((png_structp png_ptr));
|
|
|
3341 |
#endif
|
|
|
3342 |
|
|
|
3343 |
/* Combine a row of data, dealing with alpha, etc. if requested */
|
|
|
3344 |
PNG_EXTERN void png_combine_row PNGARG((png_structp png_ptr, png_bytep row,
|
|
|
3345 |
int mask));
|
|
|
3346 |
|
|
|
3347 |
#if defined(PNG_READ_INTERLACING_SUPPORTED)
|
|
|
3348 |
/* Expand an interlaced row */
|
|
|
3349 |
/* OLD pre-1.0.9 interface:
|
|
|
3350 |
PNG_EXTERN void png_do_read_interlace PNGARG((png_row_infop row_info,
|
|
|
3351 |
png_bytep row, int pass, png_uint_32 transformations));
|
|
|
3352 |
*/
|
|
|
3353 |
PNG_EXTERN void png_do_read_interlace PNGARG((png_structp png_ptr));
|
|
|
3354 |
#endif
|
|
|
3355 |
|
|
|
3356 |
/* GRR TO DO (2.0 or whenever): simplify other internal calling interfaces */
|
|
|
3357 |
|
|
|
3358 |
#if defined(PNG_WRITE_INTERLACING_SUPPORTED)
|
|
|
3359 |
/* Grab pixels out of a row for an interlaced pass */
|
|
|
3360 |
PNG_EXTERN void png_do_write_interlace PNGARG((png_row_infop row_info,
|
|
|
3361 |
png_bytep row, int pass));
|
|
|
3362 |
#endif
|
|
|
3363 |
|
|
|
3364 |
/* Unfilter a row */
|
|
|
3365 |
PNG_EXTERN void png_read_filter_row PNGARG((png_structp png_ptr,
|
|
|
3366 |
png_row_infop row_info, png_bytep row, png_bytep prev_row, int filter));
|
|
|
3367 |
|
|
|
3368 |
/* Choose the best filter to use and filter the row data */
|
|
|
3369 |
PNG_EXTERN void png_write_find_filter PNGARG((png_structp png_ptr,
|
|
|
3370 |
png_row_infop row_info));
|
|
|
3371 |
|
|
|
3372 |
/* Write out the filtered row. */
|
|
|
3373 |
PNG_EXTERN void png_write_filtered_row PNGARG((png_structp png_ptr,
|
|
|
3374 |
png_bytep filtered_row));
|
|
|
3375 |
/* Finish a row while reading, dealing with interlacing passes, etc. */
|
|
|
3376 |
PNG_EXTERN void png_read_finish_row PNGARG((png_structp png_ptr));
|
|
|
3377 |
|
|
|
3378 |
/* Initialize the row buffers, etc. */
|
|
|
3379 |
PNG_EXTERN void png_read_start_row PNGARG((png_structp png_ptr));
|
|
|
3380 |
/* Optional call to update the users info structure */
|
|
|
3381 |
PNG_EXTERN void png_read_transform_info PNGARG((png_structp png_ptr,
|
|
|
3382 |
png_infop info_ptr));
|
|
|
3383 |
|
|
|
3384 |
/* These are the functions that do the transformations */
|
|
|
3385 |
#if defined(PNG_READ_FILLER_SUPPORTED)
|
|
|
3386 |
PNG_EXTERN void png_do_read_filler PNGARG((png_row_infop row_info,
|
|
|
3387 |
png_bytep row, png_uint_32 filler, png_uint_32 flags));
|
|
|
3388 |
#endif
|
|
|
3389 |
|
|
|
3390 |
#if defined(PNG_READ_SWAP_ALPHA_SUPPORTED)
|
|
|
3391 |
PNG_EXTERN void png_do_read_swap_alpha PNGARG((png_row_infop row_info,
|
|
|
3392 |
png_bytep row));
|
|
|
3393 |
#endif
|
|
|
3394 |
|
|
|
3395 |
#if defined(PNG_WRITE_SWAP_ALPHA_SUPPORTED)
|
|
|
3396 |
PNG_EXTERN void png_do_write_swap_alpha PNGARG((png_row_infop row_info,
|
|
|
3397 |
png_bytep row));
|
|
|
3398 |
#endif
|
|
|
3399 |
|
|
|
3400 |
#if defined(PNG_READ_INVERT_ALPHA_SUPPORTED)
|
|
|
3401 |
PNG_EXTERN void png_do_read_invert_alpha PNGARG((png_row_infop row_info,
|
|
|
3402 |
png_bytep row));
|
|
|
3403 |
#endif
|
|
|
3404 |
|
|
|
3405 |
#if defined(PNG_WRITE_INVERT_ALPHA_SUPPORTED)
|
|
|
3406 |
PNG_EXTERN void png_do_write_invert_alpha PNGARG((png_row_infop row_info,
|
|
|
3407 |
png_bytep row));
|
|
|
3408 |
#endif
|
|
|
3409 |
|
|
|
3410 |
#if defined(PNG_WRITE_FILLER_SUPPORTED) || \
|
|
|
3411 |
defined(PNG_READ_STRIP_ALPHA_SUPPORTED)
|
|
|
3412 |
PNG_EXTERN void png_do_strip_filler PNGARG((png_row_infop row_info,
|
|
|
3413 |
png_bytep row, png_uint_32 flags));
|
|
|
3414 |
#endif
|
|
|
3415 |
|
|
|
3416 |
#if defined(PNG_READ_SWAP_SUPPORTED) || defined(PNG_WRITE_SWAP_SUPPORTED)
|
|
|
3417 |
PNG_EXTERN void png_do_swap PNGARG((png_row_infop row_info, png_bytep row));
|
|
|
3418 |
#endif
|
|
|
3419 |
|
|
|
3420 |
#if defined(PNG_READ_PACKSWAP_SUPPORTED) || defined(PNG_WRITE_PACKSWAP_SUPPORTED)
|
|
|
3421 |
PNG_EXTERN void png_do_packswap PNGARG((png_row_infop row_info, png_bytep row));
|
|
|
3422 |
#endif
|
|
|
3423 |
|
|
|
3424 |
#if defined(PNG_READ_RGB_TO_GRAY_SUPPORTED)
|
|
|
3425 |
PNG_EXTERN int png_do_rgb_to_gray PNGARG((png_structp png_ptr, png_row_infop
|
|
|
3426 |
row_info, png_bytep row));
|
|
|
3427 |
#endif
|
|
|
3428 |
|
|
|
3429 |
#if defined(PNG_READ_GRAY_TO_RGB_SUPPORTED)
|
|
|
3430 |
PNG_EXTERN void png_do_gray_to_rgb PNGARG((png_row_infop row_info,
|
|
|
3431 |
png_bytep row));
|
|
|
3432 |
#endif
|
|
|
3433 |
|
|
|
3434 |
#if defined(PNG_READ_PACK_SUPPORTED)
|
|
|
3435 |
PNG_EXTERN void png_do_unpack PNGARG((png_row_infop row_info, png_bytep row));
|
|
|
3436 |
#endif
|
|
|
3437 |
|
|
|
3438 |
#if defined(PNG_READ_SHIFT_SUPPORTED)
|
|
|
3439 |
PNG_EXTERN void png_do_unshift PNGARG((png_row_infop row_info, png_bytep row,
|
|
|
3440 |
png_color_8p sig_bits));
|
|
|
3441 |
#endif
|
|
|
3442 |
|
|
|
3443 |
#if defined(PNG_READ_INVERT_SUPPORTED) || defined(PNG_WRITE_INVERT_SUPPORTED)
|
|
|
3444 |
PNG_EXTERN void png_do_invert PNGARG((png_row_infop row_info, png_bytep row));
|
|
|
3445 |
#endif
|
|
|
3446 |
|
|
|
3447 |
#if defined(PNG_READ_16_TO_8_SUPPORTED)
|
|
|
3448 |
PNG_EXTERN void png_do_chop PNGARG((png_row_infop row_info, png_bytep row));
|
|
|
3449 |
#endif
|
|
|
3450 |
|
|
|
3451 |
#if defined(PNG_READ_DITHER_SUPPORTED)
|
|
|
3452 |
PNG_EXTERN void png_do_dither PNGARG((png_row_infop row_info,
|
|
|
3453 |
png_bytep row, png_bytep palette_lookup, png_bytep dither_lookup));
|
|
|
3454 |
|
|
|
3455 |
# if defined(PNG_CORRECT_PALETTE_SUPPORTED)
|
|
|
3456 |
PNG_EXTERN void png_correct_palette PNGARG((png_structp png_ptr,
|
|
|
3457 |
png_colorp palette, int num_palette));
|
|
|
3458 |
# endif
|
|
|
3459 |
#endif
|
|
|
3460 |
|
|
|
3461 |
#if defined(PNG_READ_BGR_SUPPORTED) || defined(PNG_WRITE_BGR_SUPPORTED)
|
|
|
3462 |
PNG_EXTERN void png_do_bgr PNGARG((png_row_infop row_info, png_bytep row));
|
|
|
3463 |
#endif
|
|
|
3464 |
|
|
|
3465 |
#if defined(PNG_WRITE_PACK_SUPPORTED)
|
|
|
3466 |
PNG_EXTERN void png_do_pack PNGARG((png_row_infop row_info,
|
|
|
3467 |
png_bytep row, png_uint_32 bit_depth));
|
|
|
3468 |
#endif
|
|
|
3469 |
|
|
|
3470 |
#if defined(PNG_WRITE_SHIFT_SUPPORTED)
|
|
|
3471 |
PNG_EXTERN void png_do_shift PNGARG((png_row_infop row_info, png_bytep row,
|
|
|
3472 |
png_color_8p bit_depth));
|
|
|
3473 |
#endif
|
|
|
3474 |
|
|
|
3475 |
#if defined(PNG_READ_BACKGROUND_SUPPORTED)
|
|
|
3476 |
#if defined(PNG_READ_GAMMA_SUPPORTED)
|
|
|
3477 |
PNG_EXTERN void png_do_background PNGARG((png_row_infop row_info, png_bytep row,
|
|
|
3478 |
png_color_16p trans_values, png_color_16p background,
|
|
|
3479 |
png_color_16p background_1,
|
|
|
3480 |
png_bytep gamma_table, png_bytep gamma_from_1, png_bytep gamma_to_1,
|
|
|
3481 |
png_uint_16pp gamma_16, png_uint_16pp gamma_16_from_1,
|
|
|
3482 |
png_uint_16pp gamma_16_to_1, int gamma_shift));
|
|
|
3483 |
#else
|
|
|
3484 |
PNG_EXTERN void png_do_background PNGARG((png_row_infop row_info, png_bytep row,
|
|
|
3485 |
png_color_16p trans_values, png_color_16p background));
|
|
|
3486 |
#endif
|
|
|
3487 |
#endif
|
|
|
3488 |
|
|
|
3489 |
#if defined(PNG_READ_GAMMA_SUPPORTED)
|
|
|
3490 |
PNG_EXTERN void png_do_gamma PNGARG((png_row_infop row_info, png_bytep row,
|
|
|
3491 |
png_bytep gamma_table, png_uint_16pp gamma_16_table,
|
|
|
3492 |
int gamma_shift));
|
|
|
3493 |
#endif
|
|
|
3494 |
|
|
|
3495 |
#if defined(PNG_READ_EXPAND_SUPPORTED)
|
|
|
3496 |
PNG_EXTERN void png_do_expand_palette PNGARG((png_row_infop row_info,
|
|
|
3497 |
png_bytep row, png_colorp palette, png_bytep trans, int num_trans));
|
|
|
3498 |
PNG_EXTERN void png_do_expand PNGARG((png_row_infop row_info,
|
|
|
3499 |
png_bytep row, png_color_16p trans_value));
|
|
|
3500 |
#endif
|
|
|
3501 |
|
|
|
3502 |
/* The following decodes the appropriate chunks, and does error correction,
|
|
|
3503 |
* then calls the appropriate callback for the chunk if it is valid.
|
|
|
3504 |
*/
|
|
|
3505 |
|
|
|
3506 |
/* Decode the IHDR chunk */
|
|
|
3507 |
PNG_EXTERN void png_handle_IHDR PNGARG((png_structp png_ptr, png_infop info_ptr,
|
|
|
3508 |
png_uint_32 length));
|
|
|
3509 |
PNG_EXTERN void png_handle_PLTE PNGARG((png_structp png_ptr, png_infop info_ptr,
|
|
|
3510 |
png_uint_32 length));
|
|
|
3511 |
PNG_EXTERN void png_handle_IEND PNGARG((png_structp png_ptr, png_infop info_ptr,
|
|
|
3512 |
png_uint_32 length));
|
|
|
3513 |
|
|
|
3514 |
#if defined(PNG_READ_bKGD_SUPPORTED)
|
|
|
3515 |
PNG_EXTERN void png_handle_bKGD PNGARG((png_structp png_ptr, png_infop info_ptr,
|
|
|
3516 |
png_uint_32 length));
|
|
|
3517 |
#endif
|
|
|
3518 |
|
|
|
3519 |
#if defined(PNG_READ_cHRM_SUPPORTED)
|
|
|
3520 |
PNG_EXTERN void png_handle_cHRM PNGARG((png_structp png_ptr, png_infop info_ptr,
|
|
|
3521 |
png_uint_32 length));
|
|
|
3522 |
#endif
|
|
|
3523 |
|
|
|
3524 |
#if defined(PNG_READ_gAMA_SUPPORTED)
|
|
|
3525 |
PNG_EXTERN void png_handle_gAMA PNGARG((png_structp png_ptr, png_infop info_ptr,
|
|
|
3526 |
png_uint_32 length));
|
|
|
3527 |
#endif
|
|
|
3528 |
|
|
|
3529 |
#if defined(PNG_READ_hIST_SUPPORTED)
|
|
|
3530 |
PNG_EXTERN void png_handle_hIST PNGARG((png_structp png_ptr, png_infop info_ptr,
|
|
|
3531 |
png_uint_32 length));
|
|
|
3532 |
#endif
|
|
|
3533 |
|
|
|
3534 |
#if defined(PNG_READ_iCCP_SUPPORTED)
|
|
|
3535 |
extern void png_handle_iCCP PNGARG((png_structp png_ptr, png_infop info_ptr,
|
|
|
3536 |
png_uint_32 length));
|
|
|
3537 |
#endif /* PNG_READ_iCCP_SUPPORTED */
|
|
|
3538 |
|
|
|
3539 |
#if defined(PNG_READ_iTXt_SUPPORTED)
|
|
|
3540 |
PNG_EXTERN void png_handle_iTXt PNGARG((png_structp png_ptr, png_infop info_ptr,
|
|
|
3541 |
png_uint_32 length));
|
|
|
3542 |
#endif
|
|
|
3543 |
|
|
|
3544 |
#if defined(PNG_READ_oFFs_SUPPORTED)
|
|
|
3545 |
PNG_EXTERN void png_handle_oFFs PNGARG((png_structp png_ptr, png_infop info_ptr,
|
|
|
3546 |
png_uint_32 length));
|
|
|
3547 |
#endif
|
|
|
3548 |
|
|
|
3549 |
#if defined(PNG_READ_pCAL_SUPPORTED)
|
|
|
3550 |
PNG_EXTERN void png_handle_pCAL PNGARG((png_structp png_ptr, png_infop info_ptr,
|
|
|
3551 |
png_uint_32 length));
|
|
|
3552 |
#endif
|
|
|
3553 |
|
|
|
3554 |
#if defined(PNG_READ_pHYs_SUPPORTED)
|
|
|
3555 |
PNG_EXTERN void png_handle_pHYs PNGARG((png_structp png_ptr, png_infop info_ptr,
|
|
|
3556 |
png_uint_32 length));
|
|
|
3557 |
#endif
|
|
|
3558 |
|
|
|
3559 |
#if defined(PNG_READ_sBIT_SUPPORTED)
|
|
|
3560 |
PNG_EXTERN void png_handle_sBIT PNGARG((png_structp png_ptr, png_infop info_ptr,
|
|
|
3561 |
png_uint_32 length));
|
|
|
3562 |
#endif
|
|
|
3563 |
|
|
|
3564 |
#if defined(PNG_READ_sCAL_SUPPORTED)
|
|
|
3565 |
PNG_EXTERN void png_handle_sCAL PNGARG((png_structp png_ptr, png_infop info_ptr,
|
|
|
3566 |
png_uint_32 length));
|
|
|
3567 |
#endif
|
|
|
3568 |
|
|
|
3569 |
#if defined(PNG_READ_sPLT_SUPPORTED)
|
|
|
3570 |
extern void png_handle_sPLT PNGARG((png_structp png_ptr, png_infop info_ptr,
|
|
|
3571 |
png_uint_32 length));
|
|
|
3572 |
#endif /* PNG_READ_sPLT_SUPPORTED */
|
|
|
3573 |
|
|
|
3574 |
#if defined(PNG_READ_sRGB_SUPPORTED)
|
|
|
3575 |
PNG_EXTERN void png_handle_sRGB PNGARG((png_structp png_ptr, png_infop info_ptr,
|
|
|
3576 |
png_uint_32 length));
|
|
|
3577 |
#endif
|
|
|
3578 |
|
|
|
3579 |
#if defined(PNG_READ_tEXt_SUPPORTED)
|
|
|
3580 |
PNG_EXTERN void png_handle_tEXt PNGARG((png_structp png_ptr, png_infop info_ptr,
|
|
|
3581 |
png_uint_32 length));
|
|
|
3582 |
#endif
|
|
|
3583 |
|
|
|
3584 |
#if defined(PNG_READ_tIME_SUPPORTED)
|
|
|
3585 |
PNG_EXTERN void png_handle_tIME PNGARG((png_structp png_ptr, png_infop info_ptr,
|
|
|
3586 |
png_uint_32 length));
|
|
|
3587 |
#endif
|
|
|
3588 |
|
|
|
3589 |
#if defined(PNG_READ_tRNS_SUPPORTED)
|
|
|
3590 |
PNG_EXTERN void png_handle_tRNS PNGARG((png_structp png_ptr, png_infop info_ptr,
|
|
|
3591 |
png_uint_32 length));
|
|
|
3592 |
#endif
|
|
|
3593 |
|
|
|
3594 |
#if defined(PNG_READ_zTXt_SUPPORTED)
|
|
|
3595 |
PNG_EXTERN void png_handle_zTXt PNGARG((png_structp png_ptr, png_infop info_ptr,
|
|
|
3596 |
png_uint_32 length));
|
|
|
3597 |
#endif
|
|
|
3598 |
|
|
|
3599 |
PNG_EXTERN void png_handle_unknown PNGARG((png_structp png_ptr,
|
|
|
3600 |
png_infop info_ptr, png_uint_32 length));
|
|
|
3601 |
|
|
|
3602 |
PNG_EXTERN void png_check_chunk_name PNGARG((png_structp png_ptr,
|
|
|
3603 |
png_bytep chunk_name));
|
|
|
3604 |
|
|
|
3605 |
/* Handle the transformations for reading and writing */
|
|
|
3606 |
PNG_EXTERN void png_do_read_transformations PNGARG((png_structp png_ptr));
|
|
|
3607 |
PNG_EXTERN void png_do_write_transformations PNGARG((png_structp png_ptr));
|
|
|
3608 |
|
|
|
3609 |
PNG_EXTERN void png_init_read_transformations PNGARG((png_structp png_ptr));
|
|
|
3610 |
|
|
|
3611 |
#ifdef PNG_PROGRESSIVE_READ_SUPPORTED
|
|
|
3612 |
PNG_EXTERN void png_push_read_chunk PNGARG((png_structp png_ptr,
|
|
|
3613 |
png_infop info_ptr));
|
|
|
3614 |
PNG_EXTERN void png_push_read_sig PNGARG((png_structp png_ptr,
|
|
|
3615 |
png_infop info_ptr));
|
|
|
3616 |
PNG_EXTERN void png_push_check_crc PNGARG((png_structp png_ptr));
|
|
|
3617 |
PNG_EXTERN void png_push_crc_skip PNGARG((png_structp png_ptr,
|
|
|
3618 |
png_uint_32 length));
|
|
|
3619 |
PNG_EXTERN void png_push_crc_finish PNGARG((png_structp png_ptr));
|
|
|
3620 |
PNG_EXTERN void png_push_save_buffer PNGARG((png_structp png_ptr));
|
|
|
3621 |
PNG_EXTERN void png_push_restore_buffer PNGARG((png_structp png_ptr,
|
|
|
3622 |
png_bytep buffer, png_size_t buffer_length));
|
|
|
3623 |
PNG_EXTERN void png_push_read_IDAT PNGARG((png_structp png_ptr));
|
|
|
3624 |
PNG_EXTERN void png_process_IDAT_data PNGARG((png_structp png_ptr,
|
|
|
3625 |
png_bytep buffer, png_size_t buffer_length));
|
|
|
3626 |
PNG_EXTERN void png_push_process_row PNGARG((png_structp png_ptr));
|
|
|
3627 |
PNG_EXTERN void png_push_handle_unknown PNGARG((png_structp png_ptr,
|
|
|
3628 |
png_infop info_ptr, png_uint_32 length));
|
|
|
3629 |
PNG_EXTERN void png_push_have_info PNGARG((png_structp png_ptr,
|
|
|
3630 |
png_infop info_ptr));
|
|
|
3631 |
PNG_EXTERN void png_push_have_end PNGARG((png_structp png_ptr,
|
|
|
3632 |
png_infop info_ptr));
|
|
|
3633 |
PNG_EXTERN void png_push_have_row PNGARG((png_structp png_ptr, png_bytep row));
|
|
|
3634 |
PNG_EXTERN void png_push_read_end PNGARG((png_structp png_ptr,
|
|
|
3635 |
png_infop info_ptr));
|
|
|
3636 |
PNG_EXTERN void png_process_some_data PNGARG((png_structp png_ptr,
|
|
|
3637 |
png_infop info_ptr));
|
|
|
3638 |
PNG_EXTERN void png_read_push_finish_row PNGARG((png_structp png_ptr));
|
|
|
3639 |
#if defined(PNG_READ_tEXt_SUPPORTED)
|
|
|
3640 |
PNG_EXTERN void png_push_handle_tEXt PNGARG((png_structp png_ptr,
|
|
|
3641 |
png_infop info_ptr, png_uint_32 length));
|
|
|
3642 |
PNG_EXTERN void png_push_read_tEXt PNGARG((png_structp png_ptr,
|
|
|
3643 |
png_infop info_ptr));
|
|
|
3644 |
#endif
|
|
|
3645 |
#if defined(PNG_READ_zTXt_SUPPORTED)
|
|
|
3646 |
PNG_EXTERN void png_push_handle_zTXt PNGARG((png_structp png_ptr,
|
|
|
3647 |
png_infop info_ptr, png_uint_32 length));
|
|
|
3648 |
PNG_EXTERN void png_push_read_zTXt PNGARG((png_structp png_ptr,
|
|
|
3649 |
png_infop info_ptr));
|
|
|
3650 |
#endif
|
|
|
3651 |
#if defined(PNG_READ_iTXt_SUPPORTED)
|
|
|
3652 |
PNG_EXTERN void png_push_handle_iTXt PNGARG((png_structp png_ptr,
|
|
|
3653 |
png_infop info_ptr, png_uint_32 length));
|
|
|
3654 |
PNG_EXTERN void png_push_read_iTXt PNGARG((png_structp png_ptr,
|
|
|
3655 |
png_infop info_ptr));
|
|
|
3656 |
#endif
|
|
|
3657 |
|
|
|
3658 |
#endif /* PNG_PROGRESSIVE_READ_SUPPORTED */
|
|
|
3659 |
|
|
|
3660 |
#ifdef PNG_MNG_FEATURES_SUPPORTED
|
|
|
3661 |
PNG_EXTERN void png_do_read_intrapixel PNGARG((png_row_infop row_info,
|
|
|
3662 |
png_bytep row));
|
|
|
3663 |
PNG_EXTERN void png_do_write_intrapixel PNGARG((png_row_infop row_info,
|
|
|
3664 |
png_bytep row));
|
|
|
3665 |
#endif
|
|
|
3666 |
|
|
|
3667 |
#if defined(PNG_ASSEMBLER_CODE_SUPPORTED)
|
|
|
3668 |
#if defined(PNG_MMX_CODE_SUPPORTED)
|
|
|
3669 |
/* png.c */ /* PRIVATE */
|
|
|
3670 |
PNG_EXTERN void png_init_mmx_flags PNGARG((png_structp png_ptr));
|
|
|
3671 |
#endif
|
|
|
3672 |
#endif
|
|
|
3673 |
|
|
|
3674 |
#if defined(PNG_INCH_CONVERSIONS) && defined(PNG_FLOATING_POINT_SUPPORTED)
|
|
|
3675 |
PNG_EXTERN png_uint_32 png_get_pixels_per_inch PNGARG((png_structp png_ptr,
|
|
|
3676 |
png_infop info_ptr));
|
|
|
3677 |
|
|
|
3678 |
PNG_EXTERN png_uint_32 png_get_x_pixels_per_inch PNGARG((png_structp png_ptr,
|
|
|
3679 |
png_infop info_ptr));
|
|
|
3680 |
|
|
|
3681 |
PNG_EXTERN png_uint_32 png_get_y_pixels_per_inch PNGARG((png_structp png_ptr,
|
|
|
3682 |
png_infop info_ptr));
|
|
|
3683 |
|
|
|
3684 |
PNG_EXTERN float png_get_x_offset_inches PNGARG((png_structp png_ptr,
|
|
|
3685 |
png_infop info_ptr));
|
|
|
3686 |
|
|
|
3687 |
PNG_EXTERN float png_get_y_offset_inches PNGARG((png_structp png_ptr,
|
|
|
3688 |
png_infop info_ptr));
|
|
|
3689 |
|
|
|
3690 |
#if defined(PNG_pHYs_SUPPORTED)
|
|
|
3691 |
PNG_EXTERN png_uint_32 png_get_pHYs_dpi PNGARG((png_structp png_ptr,
|
|
|
3692 |
png_infop info_ptr, png_uint_32 *res_x, png_uint_32 *res_y, int *unit_type));
|
|
|
3693 |
#endif /* PNG_pHYs_SUPPORTED */
|
|
|
3694 |
#endif /* PNG_INCH_CONVERSIONS && PNG_FLOATING_POINT_SUPPORTED */
|
|
|
3695 |
|
|
|
3696 |
/* Read the chunk header (length + type name) */
|
|
|
3697 |
PNG_EXTERN png_uint_32 png_read_chunk_header PNGARG((png_structp png_ptr));
|
|
|
3698 |
|
|
|
3699 |
/* Added at libpng version 1.2.34 */
|
|
|
3700 |
#if defined(PNG_cHRM_SUPPORTED)
|
|
|
3701 |
PNG_EXTERN int png_check_cHRM_fixed PNGARG((png_structp png_ptr,
|
|
|
3702 |
png_fixed_point int_white_x, png_fixed_point int_white_y,
|
|
|
3703 |
png_fixed_point int_red_x, png_fixed_point int_red_y, png_fixed_point
|
|
|
3704 |
int_green_x, png_fixed_point int_green_y, png_fixed_point int_blue_x,
|
|
|
3705 |
png_fixed_point int_blue_y));
|
|
|
3706 |
#endif
|
|
|
3707 |
|
|
|
3708 |
#if defined(PNG_cHRM_SUPPORTED)
|
|
|
3709 |
#if !defined(PNG_NO_CHECK_cHRM)
|
|
|
3710 |
/* Added at libpng version 1.2.34 */
|
|
|
3711 |
PNG_EXTERN void png_64bit_product (long v1, long v2, unsigned long *hi_product,
|
|
|
3712 |
unsigned long *lo_product);
|
|
|
3713 |
#endif
|
|
|
3714 |
#endif
|
|
|
3715 |
|
|
|
3716 |
/* Maintainer: Put new private prototypes here ^ and in libpngpf.3 */
|
|
|
3717 |
|
|
|
3718 |
#endif /* PNG_INTERNAL */
|
|
|
3719 |
|
|
|
3720 |
#ifdef __cplusplus
|
|
|
3721 |
}
|
|
|
3722 |
#endif
|
|
|
3723 |
|
|
|
3724 |
#endif /* PNG_VERSION_INFO_ONLY */
|
|
|
3725 |
/* Do not put anything past this line */
|
|
|
3726 |
#endif /* PNG_H */
|