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/* png.h - header file for PNG reference library
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* libpng version 1.4.4 - September 23, 2010
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* Copyright (c) 1998-2010 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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* This code is released under the libpng license (See LICENSE, below)
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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 1.4.4 - September 23, 2010: Glenn
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* See also "Contributing Authors", below.
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* Note about libpng version numbers:
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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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* 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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* 0.99a-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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* 1.0.5 (+ 2 patches) 10005
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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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* 1.0.6h 10007 10.6h (testing xy.z so-numbering)
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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 12.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 12.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 12.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 12.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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* 1.2.10beta1-7 13 10210 12.so.0.10[.0]
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* 1.2.10rc1-2 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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* 1.4.0beta1-5 14 10400 14.so.0.0[.0]
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* 1.2.11beta1-4 13 10211 12.so.0.11[.0]
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* 1.4.0beta7-8 14 10400 14.so.0.0[.0]
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* 1.2.11 13 10211 12.so.0.11[.0]
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* 1.2.12 13 10212 12.so.0.12[.0]
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* 1.4.0beta9-14 14 10400 14.so.0.0[.0]
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* 1.2.13 13 10213 12.so.0.13[.0]
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* 1.4.0beta15-36 14 10400 14.so.0.0[.0]
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* 1.4.0beta37-87 14 10400 14.so.14.0[.0]
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* 1.4.0rc01 14 10400 14.so.14.0[.0]
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* 1.4.0beta88-109 14 10400 14.so.14.0[.0]
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* 1.4.0rc02-08 14 10400 14.so.14.0[.0]
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* 1.4.0 14 10400 14.so.14.0[.0]
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* 1.4.1beta01-03 14 10401 14.so.14.1[.0]
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* 1.4.1rc01 14 10401 14.so.14.1[.0]
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* 1.4.1beta04-12 14 10401 14.so.14.1[.0]
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* 1.4.1rc02-04 14 10401 14.so.14.1[.0]
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* 1.4.1 14 10401 14.so.14.1[.0]
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* 1.4.2beta01 14 10402 14.so.14.2[.0]
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* 1.4.2rc02-06 14 10402 14.so.14.2[.0]
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* 1.4.2 14 10402 14.so.14.2[.0]
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* 1.4.3beta01-05 14 10403 14.so.14.3[.0]
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* 1.4.3rc01-03 14 10403 14.so.14.3[.0]
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* 1.4.3 14 10403 14.so.14.3[.0]
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* 1.4.4beta01-08 14 10404 14.so.14.4[.0]
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* 1.4.4rc01-06 14 10404 14.so.14.4[.0]
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* Henceforth the source version will match the shared-library major
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* and minor numbers; the shared-library major version number will be
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* used for changes in backward compatibility, as it is intended. The
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* PNG_LIBPNG_VER macro, which is not used within libpng but is available
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* for applications, is an unsigned integer of the form xyyzz corresponding
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* to the source version x.y.z (leading zeros in y and z). Beta versions
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* were given the previous public release number plus a letter, until
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* version 1.0.6j; from then on they were given the upcoming public
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* release number plus "betaNN" or "rcN".
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* Binary incompatibility exists only when applications make direct access
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* to the info_ptr or png_ptr members through png.h, and the compiled
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* application is loaded with a different version of the library.
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* DLLNUM will change each time there are forward or backward changes
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* in binary compatibility (e.g., when a new feature is added).
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* See libpng.txt or libpng.3 for more information. The PNG specification
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* is available as a W3C Recommendation and as an ISO Specification,
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* <http://www.w3.org/TR/2003/REC-PNG-20031110/
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* COPYRIGHT NOTICE, DISCLAIMER, and LICENSE:
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* If you modify libpng you may insert additional notices immediately following
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* This code is released under the libpng license.
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* libpng versions 1.2.6, August 15, 2004, through 1.4.4, September 23, 2010, are
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* Copyright (c) 2004, 2006-2010 Glenn Randers-Pehrson, and are
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* distributed according to the same disclaimer and license as libpng-1.2.5
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* with the following individual added to the list of Contributing Authors:
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* libpng versions 1.0.7, July 1, 2000, through 1.2.5, October 3, 2002, are
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* Copyright (c) 2000-2002 Glenn Randers-Pehrson, and are
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* distributed according to the same disclaimer and license as libpng-1.0.6
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* with the following individuals added to the list of Contributing Authors:
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* Simon-Pierre Cadieux
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* and with the following additions to the disclaimer:
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* There is no warranty against interference with your enjoyment of the
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* library or against infringement. There is no warranty that our
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* efforts or the library will fulfill any of your particular purposes
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* or needs. This library is provided with all faults, and the entire
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* risk of satisfactory quality, performance, accuracy, and effort is with
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* libpng versions 0.97, January 1998, through 1.0.6, March 20, 2000, are
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* Copyright (c) 1998, 1999, 2000 Glenn Randers-Pehrson, and are
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* distributed according to the same disclaimer and license as libpng-0.96,
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* with the following individuals added to the list of Contributing Authors:
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* Glenn Randers-Pehrson
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* libpng versions 0.89, June 1996, through 0.96, May 1997, are
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* Copyright (c) 1996, 1997 Andreas Dilger
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* Distributed according to the same disclaimer and license as libpng-0.88,
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* with the following individuals added to the list of Contributing Authors:
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* libpng versions 0.5, May 1995, through 0.88, January 1996, are
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* Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.
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* For the purposes of this copyright and license, "Contributing Authors"
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* is defined as the following set of individuals:
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* The PNG Reference Library is supplied "AS IS". The Contributing Authors
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* and Group 42, Inc. disclaim all warranties, expressed or implied,
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* including, without limitation, the warranties of merchantability and of
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* fitness for any purpose. The Contributing Authors and Group 42, Inc.
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* assume no liability for direct, indirect, incidental, special, exemplary,
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* or consequential damages, which may result from the use of the PNG
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* Reference Library, even if advised of the possibility of such damage.
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* Permission is hereby granted to use, copy, modify, and distribute this
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* source code, or portions hereof, for any purpose, without fee, subject
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* to the following restrictions:
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* 1. The origin of this source code must not be misrepresented.
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* 2. Altered versions must be plainly marked as such and
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* must not be misrepresented as being the original source.
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* 3. This Copyright notice may not be removed or altered from
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* any source or altered source distribution.
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* The Contributing Authors and Group 42, Inc. specifically permit, without
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* fee, and encourage the use of this source code as a component to
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* supporting the PNG file format in commercial products. If you use this
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* source code in a product, acknowledgment is not required but would be
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* A "png_get_copyright" function is available, for convenient use in "about"
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* boxes and the like:
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* printf("%s",png_get_copyright(NULL));
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* Also, the PNG logo (in PNG format, of course) is supplied in the
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* files "pngbar.png" and "pngbar.jpg (88x31) and "pngnow.png" (98x31).
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* Libpng is OSI Certified Open Source Software. OSI Certified is a
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* certification mark of the Open Source Initiative.
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* The contributing authors would like to thank all those who helped
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* with testing, bug fixes, and patience. This wouldn't have been
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* possible without all of you.
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* Thanks to Frank J. T. Wojcik for helping with the documentation.
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* Y2K compliance in libpng:
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* =========================
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* Since the PNG Development group is an ad-hoc body, we can't make
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* an official declaration.
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* This is your unofficial assurance that libpng from version 0.71 and
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* upward through 1.4.4 are Y2K compliant. It is my belief that earlier
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* versions were also Y2K compliant.
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* Libpng only has three year fields. One is a 2-byte unsigned integer
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* that will hold years up to 65535. The other two hold the date in text
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* format, and will hold years up to 9999.
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* "png_uint_16 year" in png_time_struct.
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* "png_charp time_buffer" in png_struct and
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* "near_time_buffer", which is a local character string in png.c.
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* There are seven time-related functions:
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* png.c: png_convert_to_rfc_1123() in png.c
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* (formerly png_convert_to_rfc_1152() in error)
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* png_convert_from_struct_tm() in pngwrite.c, called in pngwrite.c
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* png_convert_from_time_t() in pngwrite.c
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* png_get_tIME() in pngget.c
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* png_handle_tIME() in pngrutil.c, called in pngread.c
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* png_set_tIME() in pngset.c
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* png_write_tIME() in pngwutil.c, called in pngwrite.c
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* All handle dates properly in a Y2K environment. The
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* png_convert_from_time_t() function calls gmtime() to convert from system
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* clock time, which returns (year - 1900), which we properly convert to
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* the full 4-digit year. There is a possibility that applications using
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* libpng are not passing 4-digit years into the png_convert_to_rfc_1123()
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* function, or that they are incorrectly passing only a 2-digit year
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* instead of "year - 1900" into the png_convert_from_struct_tm() function,
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* but this is not under our control. The libpng documentation has always
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* stated that it works with 4-digit years, and the APIs have been
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* documented as such.
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* The tIME chunk itself is also Y2K compliant. It uses a 2-byte unsigned
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* integer to hold the year, and can hold years as large as 65535.
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* zlib, upon which libpng depends, is also Y2K compliant. It contains
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* no date-related code.
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* Glenn Randers-Pehrson
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* PNG Development Group
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/* This is not the place to learn how to use libpng. The file libpng.txt
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* describes how to use libpng, and the file example.c summarizes it
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* with some code on which to build. This file is useful for looking
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* at the actual function definitions and structure components.
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/* Version information for png.h - this should match the version in png.c */
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#define PNG_LIBPNG_VER_STRING "1.4.4"
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#define PNG_HEADER_VERSION_STRING \
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" libpng version 1.4.4 - September 23, 2010\n"
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#define PNG_LIBPNG_VER_SONUM 14
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#define PNG_LIBPNG_VER_DLLNUM 14
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/* These should match the first 3 components of PNG_LIBPNG_VER_STRING: */
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#define PNG_LIBPNG_VER_MAJOR 1
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#define PNG_LIBPNG_VER_MINOR 4
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#define PNG_LIBPNG_VER_RELEASE 4
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/* This should match the numeric part of the final component of
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* PNG_LIBPNG_VER_STRING, omitting any leading zero:
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#define PNG_LIBPNG_VER_BUILD 0
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#define PNG_LIBPNG_BUILD_ALPHA 1
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#define PNG_LIBPNG_BUILD_BETA 2
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#define PNG_LIBPNG_BUILD_RC 3
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#define PNG_LIBPNG_BUILD_STABLE 4
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#define PNG_LIBPNG_BUILD_RELEASE_STATUS_MASK 7
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/* Release-Specific Flags */
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#define PNG_LIBPNG_BUILD_PATCH 8 /* Can be OR'ed with
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PNG_LIBPNG_BUILD_STABLE only */
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#define PNG_LIBPNG_BUILD_PRIVATE 16 /* Cannot be OR'ed with
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PNG_LIBPNG_BUILD_SPECIAL */
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#define PNG_LIBPNG_BUILD_SPECIAL 32 /* Cannot be OR'ed with
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PNG_LIBPNG_BUILD_PRIVATE */
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#define PNG_LIBPNG_BUILD_BASE_TYPE PNG_LIBPNG_BUILD_BETA
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/* Careful here. At one time, Guy wanted to use 082, but that would be octal.
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* We must not include leading zeros.
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* Versions 0.7 through 1.0.0 were in the range 0 to 100 here (only
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* version 1.0.0 was mis-numbered 100 instead of 10000). From
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* version 1.0.1 it's xxyyzz, where x=major, y=minor, z=release
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#define PNG_LIBPNG_VER 10404 /* 1.4.4 */
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#ifndef PNG_VERSION_INFO_ONLY
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/* Include the compression library's header */
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/* Include all user configurable info, including optional assembler routines */
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* Added at libpng-1.2.8
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* Ref MSDN: Private as priority over Special
409
* VS_FF_PRIVATEBUILD File *was not* built using standard release
410
* procedures. If this value is given, the StringFileInfo block must
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* contain a PrivateBuild string.
413
* VS_FF_SPECIALBUILD File *was* built by the original company using
414
* standard release procedures but is a variation of the standard
415
* file of the same version number. If this value is given, the
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* StringFileInfo block must contain a SpecialBuild string.
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#ifdef PNG_USER_PRIVATEBUILD
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# define PNG_LIBPNG_BUILD_TYPE \
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(PNG_LIBPNG_BUILD_BASE_TYPE | PNG_LIBPNG_BUILD_PRIVATE)
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# ifdef PNG_LIBPNG_SPECIALBUILD
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# define PNG_LIBPNG_BUILD_TYPE \
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(PNG_LIBPNG_BUILD_BASE_TYPE | PNG_LIBPNG_BUILD_SPECIAL)
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# define PNG_LIBPNG_BUILD_TYPE (PNG_LIBPNG_BUILD_BASE_TYPE)
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#ifndef PNG_VERSION_INFO_ONLY
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/* Inhibit C++ name-mangling for libpng functions but not for system calls. */
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#endif /* __cplusplus */
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/* This file is arranged in several sections. The first section contains
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* structure and type definitions. The second section contains the external
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* library functions, while the third has the internal library functions,
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* which applications aren't expected to use directly.
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/* Variables declared in png.c - only it needs to define PNG_NO_EXTERN */
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#if !defined(PNG_NO_EXTERN) || defined(PNG_ALWAYS_EXTERN)
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/* Version information for C files, stored in png.c. This had better match
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#define png_libpng_ver png_get_header_ver(NULL)
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#endif /* PNG_NO_EXTERN */
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/* Three color definitions. The order of the red, green, and blue, (and the
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* exact size) is not important, although the size of the fields need to
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* be png_byte or png_uint_16 (as defined below).
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typedef struct png_color_struct
463
typedef png_color FAR * png_colorp;
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typedef png_color FAR * FAR * png_colorpp;
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typedef struct png_color_16_struct
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png_byte index; /* used for palette files */
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png_uint_16 red; /* for use in red green blue files */
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png_uint_16 gray; /* for use in grayscale files */
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typedef png_color_16 FAR * png_color_16p;
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typedef png_color_16 FAR * FAR * png_color_16pp;
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typedef struct png_color_8_struct
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png_byte red; /* for use in red green blue files */
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png_byte gray; /* for use in grayscale files */
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png_byte alpha; /* for alpha channel files */
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typedef png_color_8 FAR * png_color_8p;
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typedef png_color_8 FAR * FAR * png_color_8pp;
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* The following two structures are used for the in-core representation
492
typedef struct png_sPLT_entry_struct
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png_uint_16 frequency;
500
typedef png_sPLT_entry FAR * png_sPLT_entryp;
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typedef png_sPLT_entry FAR * FAR * png_sPLT_entrypp;
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/* When the depth of the sPLT palette is 8 bits, the color and alpha samples
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* occupy the LSB of their respective members, and the MSB of each member
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* is zero-filled. The frequency member always occupies the full 16 bits.
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typedef struct png_sPLT_struct
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png_charp name; /* palette name */
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png_byte depth; /* depth of palette samples */
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png_sPLT_entryp entries; /* palette entries */
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png_int_32 nentries; /* number of palette entries */
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typedef png_sPLT_t FAR * png_sPLT_tp;
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typedef png_sPLT_t FAR * FAR * png_sPLT_tpp;
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#ifdef PNG_TEXT_SUPPORTED
519
/* png_text holds the contents of a text/ztxt/itxt chunk in a PNG file,
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* and whether that contents is compressed or not. The "key" field
521
* points to a regular zero-terminated C string. The "text", "lang", and
522
* "lang_key" fields can be regular C strings, empty strings, or NULL pointers.
523
* However, the * structure returned by png_get_text() will always contain
524
* regular zero-terminated C strings (possibly empty), never NULL pointers,
525
* so they can be safely used in printf() and other string-handling functions.
527
typedef struct png_text_struct
529
int compression; /* compression value:
534
png_charp key; /* keyword, 1-79 character description of "text" */
535
png_charp text; /* comment, may be an empty string (ie "")
537
png_size_t text_length; /* length of the text string */
538
#ifdef PNG_iTXt_SUPPORTED
539
png_size_t itxt_length; /* length of the itxt string */
540
png_charp lang; /* language code, 0-79 characters
542
png_charp lang_key; /* keyword translated UTF-8 string, 0 or more
543
chars or a NULL pointer */
546
typedef png_text FAR * png_textp;
547
typedef png_text FAR * FAR * png_textpp;
550
/* Supported compression types for text in PNG files (tEXt, and zTXt).
551
* The values of the PNG_TEXT_COMPRESSION_ defines should NOT be changed. */
552
#define PNG_TEXT_COMPRESSION_NONE_WR -3
553
#define PNG_TEXT_COMPRESSION_zTXt_WR -2
554
#define PNG_TEXT_COMPRESSION_NONE -1
555
#define PNG_TEXT_COMPRESSION_zTXt 0
556
#define PNG_ITXT_COMPRESSION_NONE 1
557
#define PNG_ITXT_COMPRESSION_zTXt 2
558
#define PNG_TEXT_COMPRESSION_LAST 3 /* Not a valid value */
560
/* png_time is a way to hold the time in an machine independent way.
561
* Two conversions are provided, both from time_t and struct tm. There
562
* is no portable way to convert to either of these structures, as far
563
* as I know. If you know of a portable way, send it to me. As a side
564
* note - PNG has always been Year 2000 compliant!
566
typedef struct png_time_struct
568
png_uint_16 year; /* full year, as in, 1995 */
569
png_byte month; /* month of year, 1 - 12 */
570
png_byte day; /* day of month, 1 - 31 */
571
png_byte hour; /* hour of day, 0 - 23 */
572
png_byte minute; /* minute of hour, 0 - 59 */
573
png_byte second; /* second of minute, 0 - 60 (for leap seconds) */
575
typedef png_time FAR * png_timep;
576
typedef png_time FAR * FAR * png_timepp;
578
#if defined(PNG_UNKNOWN_CHUNKS_SUPPORTED) || \
579
defined(PNG_HANDLE_AS_UNKNOWN_SUPPORTED)
580
/* png_unknown_chunk is a structure to hold queued chunks for which there is
581
* no specific support. The idea is that we can use this to queue
582
* up private chunks for output even though the library doesn't actually
583
* know about their semantics.
585
typedef struct png_unknown_chunk_t
591
/* libpng-using applications should NOT directly modify this byte. */
592
png_byte location; /* mode of operation at read time */
595
typedef png_unknown_chunk FAR * png_unknown_chunkp;
596
typedef png_unknown_chunk FAR * FAR * png_unknown_chunkpp;
599
/* png_info is a structure that holds the information in a PNG file so
600
* that the application can find out the characteristics of the image.
601
* If you are reading the file, this structure will tell you what is
602
* in the PNG file. If you are writing the file, fill in the information
603
* you want to put into the PNG file, then call png_write_info().
604
* The names chosen should be very close to the PNG specification, so
605
* consult that document for information about the meaning of each field.
607
* With libpng < 0.95, it was only possible to directly set and read the
608
* the values in the png_info_struct, which meant that the contents and
609
* order of the values had to remain fixed. With libpng 0.95 and later,
610
* however, there are now functions that abstract the contents of
611
* png_info_struct from the application, so this makes it easier to use
612
* libpng with dynamic libraries, and even makes it possible to use
613
* libraries that don't have all of the libpng ancillary chunk-handing
616
* In any case, the order of the parameters in png_info_struct should NOT
617
* be changed for as long as possible to keep compatibility with applications
618
* that use the old direct-access method with png_info_struct.
620
* The following members may have allocated storage attached that should be
621
* cleaned up before the structure is discarded: palette, trans, text,
622
* pcal_purpose, pcal_units, pcal_params, hist, iccp_name, iccp_profile,
623
* splt_palettes, scal_unit, row_pointers, and unknowns. By default, these
624
* are automatically freed when the info structure is deallocated, if they were
625
* allocated internally by libpng. This behavior can be changed by means
626
* of the png_data_freer() function.
628
* More allocation details: all the chunk-reading functions that
629
* change these members go through the corresponding png_set_*
630
* functions. A function to clear these members is available: see
631
* png_free_data(). The png_set_* functions do not depend on being
632
* able to point info structure members to any of the storage they are
633
* passed (they make their own copies), EXCEPT that the png_set_text
634
* functions use the same storage passed to them in the text_ptr or
635
* itxt_ptr structure argument, and the png_set_rows and png_set_unknowns
636
* functions do not make their own copies.
638
typedef struct png_info_struct
640
/* the following are necessary for every PNG file */
641
png_uint_32 width PNG_DEPSTRUCT; /* width of image in pixels (from IHDR) */
642
png_uint_32 height PNG_DEPSTRUCT; /* height of image in pixels (from IHDR) */
643
png_uint_32 valid PNG_DEPSTRUCT; /* valid chunk data (see PNG_INFO_
645
png_size_t rowbytes PNG_DEPSTRUCT; /* bytes needed to hold an untransformed
647
png_colorp palette PNG_DEPSTRUCT; /* array of color values
648
(valid & PNG_INFO_PLTE) */
649
png_uint_16 num_palette PNG_DEPSTRUCT; /* number of color entries in
651
png_uint_16 num_trans PNG_DEPSTRUCT; /* number of transparent palette
653
png_byte bit_depth PNG_DEPSTRUCT; /* 1, 2, 4, 8, or 16 bits/channel
655
png_byte color_type PNG_DEPSTRUCT; /* see PNG_COLOR_TYPE_ below
657
/* The following three should have been named *_method not *_type */
658
png_byte compression_type PNG_DEPSTRUCT; /* must be
659
PNG_COMPRESSION_TYPE_BASE (IHDR) */
660
png_byte filter_type PNG_DEPSTRUCT; /* must be PNG_FILTER_TYPE_BASE
662
png_byte interlace_type PNG_DEPSTRUCT; /* One of PNG_INTERLACE_NONE,
663
PNG_INTERLACE_ADAM7 */
665
/* The following is informational only on read, and not used on writes. */
666
png_byte channels PNG_DEPSTRUCT; /* number of data channels per
667
pixel (1, 2, 3, 4) */
668
png_byte pixel_depth PNG_DEPSTRUCT; /* number of bits per pixel */
669
png_byte spare_byte PNG_DEPSTRUCT; /* to align the data, and for
671
png_byte signature[8] PNG_DEPSTRUCT; /* magic bytes read by libpng
672
from start of file */
674
/* The rest of the data is optional. If you are reading, check the
675
* valid field to see if the information in these are valid. If you
676
* are writing, set the valid field to those chunks you want written,
677
* and initialize the appropriate fields below.
680
#if defined(PNG_gAMA_SUPPORTED) && defined(PNG_FLOATING_POINT_SUPPORTED)
681
/* The gAMA chunk describes the gamma characteristics of the system
682
* on which the image was created, normally in the range [1.0, 2.5].
683
* Data is valid if (valid & PNG_INFO_gAMA) is non-zero.
685
float gamma PNG_DEPSTRUCT; /* gamma value of image,
686
if (valid & PNG_INFO_gAMA) */
689
#ifdef PNG_sRGB_SUPPORTED
691
/* Data valid if (valid & PNG_INFO_sRGB) non-zero. */
692
png_byte srgb_intent PNG_DEPSTRUCT; /* sRGB rendering intent
696
#ifdef PNG_TEXT_SUPPORTED
697
/* The tEXt, and zTXt chunks contain human-readable textual data in
698
* uncompressed, compressed, and optionally compressed forms, respectively.
699
* The data in "text" is an array of pointers to uncompressed,
700
* null-terminated C strings. Each chunk has a keyword that describes the
701
* textual data contained in that chunk. Keywords are not required to be
702
* unique, and the text string may be empty. Any number of text chunks may
705
int num_text PNG_DEPSTRUCT; /* number of comments read/to write */
706
int max_text PNG_DEPSTRUCT; /* current size of text array */
707
png_textp text PNG_DEPSTRUCT; /* array of comments read/to write */
708
#endif /* PNG_TEXT_SUPPORTED */
710
#ifdef PNG_tIME_SUPPORTED
711
/* The tIME chunk holds the last time the displayed image data was
712
* modified. See the png_time struct for the contents of this struct.
714
png_time mod_time PNG_DEPSTRUCT;
717
#ifdef PNG_sBIT_SUPPORTED
718
/* The sBIT chunk specifies the number of significant high-order bits
719
* in the pixel data. Values are in the range [1, bit_depth], and are
720
* only specified for the channels in the pixel data. The contents of
721
* the low-order bits is not specified. Data is valid if
722
* (valid & PNG_INFO_sBIT) is non-zero.
724
png_color_8 sig_bit PNG_DEPSTRUCT; /* significant bits in color channels */
727
#if defined(PNG_tRNS_SUPPORTED) || defined(PNG_READ_EXPAND_SUPPORTED) || \
728
defined(PNG_READ_BACKGROUND_SUPPORTED)
729
/* The tRNS chunk supplies transparency data for paletted images and
730
* other image types that don't need a full alpha channel. There are
731
* "num_trans" transparency values for a paletted image, stored in the
732
* same order as the palette colors, starting from index 0. Values
733
* for the data are in the range [0, 255], ranging from fully transparent
734
* to fully opaque, respectively. For non-paletted images, there is a
735
* single color specified that should be treated as fully transparent.
736
* Data is valid if (valid & PNG_INFO_tRNS) is non-zero.
738
png_bytep trans_alpha PNG_DEPSTRUCT; /* alpha values for paletted
740
png_color_16 trans_color PNG_DEPSTRUCT; /* transparent color for
744
#if defined(PNG_bKGD_SUPPORTED) || defined(PNG_READ_BACKGROUND_SUPPORTED)
745
/* The bKGD chunk gives the suggested image background color if the
746
* display program does not have its own background color and the image
747
* is needs to composited onto a background before display. The colors
748
* in "background" are normally in the same color space/depth as the
749
* pixel data. Data is valid if (valid & PNG_INFO_bKGD) is non-zero.
751
png_color_16 background PNG_DEPSTRUCT;
754
#ifdef PNG_oFFs_SUPPORTED
755
/* The oFFs chunk gives the offset in "offset_unit_type" units rightwards
756
* and downwards from the top-left corner of the display, page, or other
757
* application-specific co-ordinate space. See the PNG_OFFSET_ defines
758
* below for the unit types. Valid if (valid & PNG_INFO_oFFs) non-zero.
760
png_int_32 x_offset PNG_DEPSTRUCT; /* x offset on page */
761
png_int_32 y_offset PNG_DEPSTRUCT; /* y offset on page */
762
png_byte offset_unit_type PNG_DEPSTRUCT; /* offset units type */
765
#ifdef PNG_pHYs_SUPPORTED
766
/* The pHYs chunk gives the physical pixel density of the image for
767
* display or printing in "phys_unit_type" units (see PNG_RESOLUTION_
768
* defines below). Data is valid if (valid & PNG_INFO_pHYs) is non-zero.
770
png_uint_32 x_pixels_per_unit PNG_DEPSTRUCT; /* horizontal pixel density */
771
png_uint_32 y_pixels_per_unit PNG_DEPSTRUCT; /* vertical pixel density */
772
png_byte phys_unit_type PNG_DEPSTRUCT; /* resolution type (see
773
PNG_RESOLUTION_ below) */
776
#ifdef PNG_hIST_SUPPORTED
777
/* The hIST chunk contains the relative frequency or importance of the
778
* various palette entries, so that a viewer can intelligently select a
779
* reduced-color palette, if required. Data is an array of "num_palette"
780
* values in the range [0,65535]. Data valid if (valid & PNG_INFO_hIST)
783
png_uint_16p hist PNG_DEPSTRUCT;
786
#ifdef PNG_cHRM_SUPPORTED
787
/* The cHRM chunk describes the CIE color characteristics of the monitor
788
* on which the PNG was created. This data allows the viewer to do gamut
789
* mapping of the input image to ensure that the viewer sees the same
790
* colors in the image as the creator. Values are in the range
791
* [0.0, 0.8]. Data valid if (valid & PNG_INFO_cHRM) non-zero.
793
#ifdef PNG_FLOATING_POINT_SUPPORTED
794
float x_white PNG_DEPSTRUCT;
795
float y_white PNG_DEPSTRUCT;
796
float x_red PNG_DEPSTRUCT;
797
float y_red PNG_DEPSTRUCT;
798
float x_green PNG_DEPSTRUCT;
799
float y_green PNG_DEPSTRUCT;
800
float x_blue PNG_DEPSTRUCT;
801
float y_blue PNG_DEPSTRUCT;
805
#ifdef PNG_pCAL_SUPPORTED
806
/* The pCAL chunk describes a transformation between the stored pixel
807
* values and original physical data values used to create the image.
808
* The integer range [0, 2^bit_depth - 1] maps to the floating-point
809
* range given by [pcal_X0, pcal_X1], and are further transformed by a
810
* (possibly non-linear) transformation function given by "pcal_type"
811
* and "pcal_params" into "pcal_units". Please see the PNG_EQUATION_
812
* defines below, and the PNG-Group's PNG extensions document for a
813
* complete description of the transformations and how they should be
814
* implemented, and for a description of the ASCII parameter strings.
815
* Data values are valid if (valid & PNG_INFO_pCAL) non-zero.
817
png_charp pcal_purpose PNG_DEPSTRUCT; /* pCAL chunk description string */
818
png_int_32 pcal_X0 PNG_DEPSTRUCT; /* minimum value */
819
png_int_32 pcal_X1 PNG_DEPSTRUCT; /* maximum value */
820
png_charp pcal_units PNG_DEPSTRUCT; /* Latin-1 string giving physical
822
png_charpp pcal_params PNG_DEPSTRUCT; /* ASCII strings containing
824
png_byte pcal_type PNG_DEPSTRUCT; /* equation type
825
(see PNG_EQUATION_ below) */
826
png_byte pcal_nparams PNG_DEPSTRUCT; /* number of parameters given
830
/* New members added in libpng-1.0.6 */
831
png_uint_32 free_me PNG_DEPSTRUCT; /* flags items libpng is
832
responsible for freeing */
834
#if defined(PNG_UNKNOWN_CHUNKS_SUPPORTED) || \
835
defined(PNG_HANDLE_AS_UNKNOWN_SUPPORTED)
836
/* Storage for unknown chunks that the library doesn't recognize. */
837
png_unknown_chunkp unknown_chunks PNG_DEPSTRUCT;
838
png_size_t unknown_chunks_num PNG_DEPSTRUCT;
841
#ifdef PNG_iCCP_SUPPORTED
842
/* iCCP chunk data. */
843
png_charp iccp_name PNG_DEPSTRUCT; /* profile name */
844
png_charp iccp_profile PNG_DEPSTRUCT; /* International Color Consortium
846
/* Note to maintainer: should be png_bytep */
847
png_uint_32 iccp_proflen PNG_DEPSTRUCT; /* ICC profile data length */
848
png_byte iccp_compression PNG_DEPSTRUCT; /* Always zero */
851
#ifdef PNG_sPLT_SUPPORTED
852
/* Data on sPLT chunks (there may be more than one). */
853
png_sPLT_tp splt_palettes PNG_DEPSTRUCT;
854
png_uint_32 splt_palettes_num PNG_DEPSTRUCT;
857
#ifdef PNG_sCAL_SUPPORTED
858
/* The sCAL chunk describes the actual physical dimensions of the
859
* subject matter of the graphic. The chunk contains a unit specification
860
* a byte value, and two ASCII strings representing floating-point
861
* values. The values are width and height corresponsing to one pixel
862
* in the image. This external representation is converted to double
863
* here. Data values are valid if (valid & PNG_INFO_sCAL) is non-zero.
865
png_byte scal_unit PNG_DEPSTRUCT; /* unit of physical scale */
866
#ifdef PNG_FLOATING_POINT_SUPPORTED
867
double scal_pixel_width PNG_DEPSTRUCT; /* width of one pixel */
868
double scal_pixel_height PNG_DEPSTRUCT; /* height of one pixel */
870
#ifdef PNG_FIXED_POINT_SUPPORTED
871
png_charp scal_s_width PNG_DEPSTRUCT; /* string containing height */
872
png_charp scal_s_height PNG_DEPSTRUCT; /* string containing width */
876
#ifdef PNG_INFO_IMAGE_SUPPORTED
877
/* Memory has been allocated if (valid & PNG_ALLOCATED_INFO_ROWS)
879
/* Data valid if (valid & PNG_INFO_IDAT) non-zero */
880
png_bytepp row_pointers PNG_DEPSTRUCT; /* the image bits */
883
#if defined(PNG_FIXED_POINT_SUPPORTED) && defined(PNG_gAMA_SUPPORTED)
884
png_fixed_point int_gamma PNG_DEPSTRUCT; /* gamma of image,
885
if (valid & PNG_INFO_gAMA) */
888
#if defined(PNG_cHRM_SUPPORTED) && defined(PNG_FIXED_POINT_SUPPORTED)
889
png_fixed_point int_x_white PNG_DEPSTRUCT;
890
png_fixed_point int_y_white PNG_DEPSTRUCT;
891
png_fixed_point int_x_red PNG_DEPSTRUCT;
892
png_fixed_point int_y_red PNG_DEPSTRUCT;
893
png_fixed_point int_x_green PNG_DEPSTRUCT;
894
png_fixed_point int_y_green PNG_DEPSTRUCT;
895
png_fixed_point int_x_blue PNG_DEPSTRUCT;
896
png_fixed_point int_y_blue PNG_DEPSTRUCT;
901
typedef png_info FAR * png_infop;
902
typedef png_info FAR * FAR * png_infopp;
904
/* Maximum positive integer used in PNG is (2^31)-1 */
905
#define PNG_UINT_31_MAX ((png_uint_32)0x7fffffffL)
906
#define PNG_UINT_32_MAX ((png_uint_32)(-1))
907
#define PNG_SIZE_MAX ((png_size_t)(-1))
909
/* These describe the color_type field in png_info. */
910
/* color type masks */
911
#define PNG_COLOR_MASK_PALETTE 1
912
#define PNG_COLOR_MASK_COLOR 2
913
#define PNG_COLOR_MASK_ALPHA 4
915
/* color types. Note that not all combinations are legal */
916
#define PNG_COLOR_TYPE_GRAY 0
917
#define PNG_COLOR_TYPE_PALETTE (PNG_COLOR_MASK_COLOR | PNG_COLOR_MASK_PALETTE)
918
#define PNG_COLOR_TYPE_RGB (PNG_COLOR_MASK_COLOR)
919
#define PNG_COLOR_TYPE_RGB_ALPHA (PNG_COLOR_MASK_COLOR | PNG_COLOR_MASK_ALPHA)
920
#define PNG_COLOR_TYPE_GRAY_ALPHA (PNG_COLOR_MASK_ALPHA)
922
#define PNG_COLOR_TYPE_RGBA PNG_COLOR_TYPE_RGB_ALPHA
923
#define PNG_COLOR_TYPE_GA PNG_COLOR_TYPE_GRAY_ALPHA
925
/* This is for compression type. PNG 1.0-1.2 only define the single type. */
926
#define PNG_COMPRESSION_TYPE_BASE 0 /* Deflate method 8, 32K window */
927
#define PNG_COMPRESSION_TYPE_DEFAULT PNG_COMPRESSION_TYPE_BASE
929
/* This is for filter type. PNG 1.0-1.2 only define the single type. */
930
#define PNG_FILTER_TYPE_BASE 0 /* Single row per-byte filtering */
931
#define PNG_INTRAPIXEL_DIFFERENCING 64 /* Used only in MNG datastreams */
932
#define PNG_FILTER_TYPE_DEFAULT PNG_FILTER_TYPE_BASE
934
/* These are for the interlacing type. These values should NOT be changed. */
935
#define PNG_INTERLACE_NONE 0 /* Non-interlaced image */
936
#define PNG_INTERLACE_ADAM7 1 /* Adam7 interlacing */
937
#define PNG_INTERLACE_LAST 2 /* Not a valid value */
939
/* These are for the oFFs chunk. These values should NOT be changed. */
940
#define PNG_OFFSET_PIXEL 0 /* Offset in pixels */
941
#define PNG_OFFSET_MICROMETER 1 /* Offset in micrometers (1/10^6 meter) */
942
#define PNG_OFFSET_LAST 2 /* Not a valid value */
944
/* These are for the pCAL chunk. These values should NOT be changed. */
945
#define PNG_EQUATION_LINEAR 0 /* Linear transformation */
946
#define PNG_EQUATION_BASE_E 1 /* Exponential base e transform */
947
#define PNG_EQUATION_ARBITRARY 2 /* Arbitrary base exponential transform */
948
#define PNG_EQUATION_HYPERBOLIC 3 /* Hyperbolic sine transformation */
949
#define PNG_EQUATION_LAST 4 /* Not a valid value */
951
/* These are for the sCAL chunk. These values should NOT be changed. */
952
#define PNG_SCALE_UNKNOWN 0 /* unknown unit (image scale) */
953
#define PNG_SCALE_METER 1 /* meters per pixel */
954
#define PNG_SCALE_RADIAN 2 /* radians per pixel */
955
#define PNG_SCALE_LAST 3 /* Not a valid value */
957
/* These are for the pHYs chunk. These values should NOT be changed. */
958
#define PNG_RESOLUTION_UNKNOWN 0 /* pixels/unknown unit (aspect ratio) */
959
#define PNG_RESOLUTION_METER 1 /* pixels/meter */
960
#define PNG_RESOLUTION_LAST 2 /* Not a valid value */
962
/* These are for the sRGB chunk. These values should NOT be changed. */
963
#define PNG_sRGB_INTENT_PERCEPTUAL 0
964
#define PNG_sRGB_INTENT_RELATIVE 1
965
#define PNG_sRGB_INTENT_SATURATION 2
966
#define PNG_sRGB_INTENT_ABSOLUTE 3
967
#define PNG_sRGB_INTENT_LAST 4 /* Not a valid value */
969
/* This is for text chunks */
970
#define PNG_KEYWORD_MAX_LENGTH 79
972
/* Maximum number of entries in PLTE/sPLT/tRNS arrays */
973
#define PNG_MAX_PALETTE_LENGTH 256
975
/* These determine if an ancillary chunk's data has been successfully read
976
* from the PNG header, or if the application has filled in the corresponding
977
* data in the info_struct to be written into the output file. The values
978
* of the PNG_INFO_<chunk> defines should NOT be changed.
980
#define PNG_INFO_gAMA 0x0001
981
#define PNG_INFO_sBIT 0x0002
982
#define PNG_INFO_cHRM 0x0004
983
#define PNG_INFO_PLTE 0x0008
984
#define PNG_INFO_tRNS 0x0010
985
#define PNG_INFO_bKGD 0x0020
986
#define PNG_INFO_hIST 0x0040
987
#define PNG_INFO_pHYs 0x0080
988
#define PNG_INFO_oFFs 0x0100
989
#define PNG_INFO_tIME 0x0200
990
#define PNG_INFO_pCAL 0x0400
991
#define PNG_INFO_sRGB 0x0800 /* GR-P, 0.96a */
992
#define PNG_INFO_iCCP 0x1000 /* ESR, 1.0.6 */
993
#define PNG_INFO_sPLT 0x2000 /* ESR, 1.0.6 */
994
#define PNG_INFO_sCAL 0x4000 /* ESR, 1.0.6 */
995
#define PNG_INFO_IDAT 0x8000L /* ESR, 1.0.6 */
997
/* This is used for the transformation routines, as some of them
998
* change these values for the row. It also should enable using
999
* the routines for other purposes.
1001
typedef struct png_row_info_struct
1003
png_uint_32 width; /* width of row */
1004
png_size_t rowbytes; /* number of bytes in row */
1005
png_byte color_type; /* color type of row */
1006
png_byte bit_depth; /* bit depth of row */
1007
png_byte channels; /* number of channels (1, 2, 3, or 4) */
1008
png_byte pixel_depth; /* bits per pixel (depth * channels) */
1011
typedef png_row_info FAR * png_row_infop;
1012
typedef png_row_info FAR * FAR * png_row_infopp;
1014
/* These are the function types for the I/O functions and for the functions
1015
* that allow the user to override the default I/O functions with his or her
1016
* own. The png_error_ptr type should match that of user-supplied warning
1017
* and error functions, while the png_rw_ptr type should match that of the
1018
* user read/write data functions.
1020
typedef struct png_struct_def png_struct;
1021
typedef png_struct FAR * png_structp;
1023
typedef void (PNGAPI *png_error_ptr) PNGARG((png_structp, png_const_charp));
1024
typedef void (PNGAPI *png_rw_ptr) PNGARG((png_structp, png_bytep, png_size_t));
1025
typedef void (PNGAPI *png_flush_ptr) PNGARG((png_structp));
1026
typedef void (PNGAPI *png_read_status_ptr) PNGARG((png_structp, png_uint_32,
1028
typedef void (PNGAPI *png_write_status_ptr) PNGARG((png_structp, png_uint_32,
1031
#ifdef PNG_PROGRESSIVE_READ_SUPPORTED
1032
typedef void (PNGAPI *png_progressive_info_ptr) PNGARG((png_structp,
1034
typedef void (PNGAPI *png_progressive_end_ptr) PNGARG((png_structp, png_infop));
1035
typedef void (PNGAPI *png_progressive_row_ptr) PNGARG((png_structp, png_bytep,
1039
#if defined(PNG_READ_USER_TRANSFORM_SUPPORTED) || \
1040
defined(PNG_WRITE_USER_TRANSFORM_SUPPORTED)
1041
typedef void (PNGAPI *png_user_transform_ptr) PNGARG((png_structp,
1042
png_row_infop, png_bytep));
1045
#ifdef PNG_USER_CHUNKS_SUPPORTED
1046
typedef int (PNGAPI *png_user_chunk_ptr) PNGARG((png_structp,
1047
png_unknown_chunkp));
1049
#ifdef PNG_UNKNOWN_CHUNKS_SUPPORTED
1050
typedef void (PNGAPI *png_unknown_chunk_ptr) PNGARG((png_structp));
1052
#ifdef PNG_SETJMP_SUPPORTED
1053
/* This must match the function definition in <setjmp.h>, and the
1054
* application must include this before png.h to obtain the definition
1057
typedef void (PNGAPI *png_longjmp_ptr) PNGARG((jmp_buf, int));
1060
/* Transform masks for the high-level interface */
1061
#define PNG_TRANSFORM_IDENTITY 0x0000 /* read and write */
1062
#define PNG_TRANSFORM_STRIP_16 0x0001 /* read only */
1063
#define PNG_TRANSFORM_STRIP_ALPHA 0x0002 /* read only */
1064
#define PNG_TRANSFORM_PACKING 0x0004 /* read and write */
1065
#define PNG_TRANSFORM_PACKSWAP 0x0008 /* read and write */
1066
#define PNG_TRANSFORM_EXPAND 0x0010 /* read only */
1067
#define PNG_TRANSFORM_INVERT_MONO 0x0020 /* read and write */
1068
#define PNG_TRANSFORM_SHIFT 0x0040 /* read and write */
1069
#define PNG_TRANSFORM_BGR 0x0080 /* read and write */
1070
#define PNG_TRANSFORM_SWAP_ALPHA 0x0100 /* read and write */
1071
#define PNG_TRANSFORM_SWAP_ENDIAN 0x0200 /* read and write */
1072
#define PNG_TRANSFORM_INVERT_ALPHA 0x0400 /* read and write */
1073
#define PNG_TRANSFORM_STRIP_FILLER 0x0800 /* write only */
1074
/* Added to libpng-1.2.34 */
1075
#define PNG_TRANSFORM_STRIP_FILLER_BEFORE PNG_TRANSFORM_STRIP_FILLER
1076
#define PNG_TRANSFORM_STRIP_FILLER_AFTER 0x1000 /* write only */
1077
/* Added to libpng-1.4.0 */
1078
#define PNG_TRANSFORM_GRAY_TO_RGB 0x2000 /* read only */
1080
/* Flags for MNG supported features */
1081
#define PNG_FLAG_MNG_EMPTY_PLTE 0x01
1082
#define PNG_FLAG_MNG_FILTER_64 0x04
1083
#define PNG_ALL_MNG_FEATURES 0x05
1085
typedef png_voidp (*png_malloc_ptr) PNGARG((png_structp, png_alloc_size_t));
1086
typedef void (*png_free_ptr) PNGARG((png_structp, png_voidp));
1088
/* The structure that holds the information to read and write PNG files.
1089
* The only people who need to care about what is inside of this are the
1090
* people who will be modifying the library for their own special needs.
1091
* It should NOT be accessed directly by an application, except to store
1095
struct png_struct_def
1097
#ifdef PNG_SETJMP_SUPPORTED
1098
jmp_buf jmpbuf PNG_DEPSTRUCT; /* used in png_error */
1099
png_longjmp_ptr longjmp_fn PNG_DEPSTRUCT;/* setjmp non-local goto
1102
png_error_ptr error_fn PNG_DEPSTRUCT; /* function for printing
1103
errors and aborting */
1104
png_error_ptr warning_fn PNG_DEPSTRUCT; /* function for printing
1106
png_voidp error_ptr PNG_DEPSTRUCT; /* user supplied struct for
1108
png_rw_ptr write_data_fn PNG_DEPSTRUCT; /* function for writing
1110
png_rw_ptr read_data_fn PNG_DEPSTRUCT; /* function for reading
1112
png_voidp io_ptr PNG_DEPSTRUCT; /* ptr to application struct
1113
for I/O functions */
1115
#ifdef PNG_READ_USER_TRANSFORM_SUPPORTED
1116
png_user_transform_ptr read_user_transform_fn PNG_DEPSTRUCT; /* user read
1120
#ifdef PNG_WRITE_USER_TRANSFORM_SUPPORTED
1121
png_user_transform_ptr write_user_transform_fn PNG_DEPSTRUCT; /* user write
1125
/* These were added in libpng-1.0.2 */
1126
#ifdef PNG_USER_TRANSFORM_PTR_SUPPORTED
1127
#if defined(PNG_READ_USER_TRANSFORM_SUPPORTED) || \
1128
defined(PNG_WRITE_USER_TRANSFORM_SUPPORTED)
1129
png_voidp user_transform_ptr PNG_DEPSTRUCT; /* user supplied struct
1130
for user transform */
1131
png_byte user_transform_depth PNG_DEPSTRUCT; /* bit depth of user
1132
transformed pixels */
1133
png_byte user_transform_channels PNG_DEPSTRUCT; /* channels in user
1134
transformed pixels */
1138
png_uint_32 mode PNG_DEPSTRUCT; /* tells us where we are in
1140
png_uint_32 flags PNG_DEPSTRUCT; /* flags indicating various
1142
png_uint_32 transformations PNG_DEPSTRUCT; /* which transformations
1145
z_stream zstream PNG_DEPSTRUCT; /* pointer to decompression
1146
structure (below) */
1147
png_bytep zbuf PNG_DEPSTRUCT; /* buffer for zlib */
1148
png_size_t zbuf_size PNG_DEPSTRUCT; /* size of zbuf */
1149
int zlib_level PNG_DEPSTRUCT; /* holds zlib compression level */
1150
int zlib_method PNG_DEPSTRUCT; /* holds zlib compression method */
1151
int zlib_window_bits PNG_DEPSTRUCT; /* holds zlib compression window
1153
int zlib_mem_level PNG_DEPSTRUCT; /* holds zlib compression memory
1155
int zlib_strategy PNG_DEPSTRUCT; /* holds zlib compression
1158
png_uint_32 width PNG_DEPSTRUCT; /* width of image in pixels */
1159
png_uint_32 height PNG_DEPSTRUCT; /* height of image in pixels */
1160
png_uint_32 num_rows PNG_DEPSTRUCT; /* number of rows in current pass */
1161
png_uint_32 usr_width PNG_DEPSTRUCT; /* width of row at start of write */
1162
png_size_t rowbytes PNG_DEPSTRUCT; /* size of row in bytes */
1163
#if 0 /* Replaced with the following in libpng-1.4.1 */
1164
png_size_t irowbytes PNG_DEPSTRUCT;
1166
/* Added in libpng-1.4.1 */
1167
#ifdef PNG_USER_LIMITS_SUPPORTED
1168
/* Total memory that a zTXt, sPLT, iTXt, iCCP, or unknown chunk
1169
* can occupy when decompressed. 0 means unlimited.
1170
* We will change the typedef from png_size_t to png_alloc_size_t
1173
png_alloc_size_t user_chunk_malloc_max PNG_DEPSTRUCT;
1175
png_uint_32 iwidth PNG_DEPSTRUCT; /* width of current interlaced
1177
png_uint_32 row_number PNG_DEPSTRUCT; /* current row in interlace pass */
1178
png_bytep prev_row PNG_DEPSTRUCT; /* buffer to save previous
1180
png_bytep row_buf PNG_DEPSTRUCT; /* buffer to save current
1182
png_bytep sub_row PNG_DEPSTRUCT; /* buffer to save "sub" row
1184
png_bytep up_row PNG_DEPSTRUCT; /* buffer to save "up" row
1186
png_bytep avg_row PNG_DEPSTRUCT; /* buffer to save "avg" row
1188
png_bytep paeth_row PNG_DEPSTRUCT; /* buffer to save "Paeth" row
1190
png_row_info row_info PNG_DEPSTRUCT; /* used for transformation
1193
png_uint_32 idat_size PNG_DEPSTRUCT; /* current IDAT size for read */
1194
png_uint_32 crc PNG_DEPSTRUCT; /* current chunk CRC value */
1195
png_colorp palette PNG_DEPSTRUCT; /* palette from the input file */
1196
png_uint_16 num_palette PNG_DEPSTRUCT; /* number of color entries in
1198
png_uint_16 num_trans PNG_DEPSTRUCT; /* number of transparency values */
1199
png_byte chunk_name[5] PNG_DEPSTRUCT; /* null-terminated name of current
1201
png_byte compression PNG_DEPSTRUCT; /* file compression type
1203
png_byte filter PNG_DEPSTRUCT; /* file filter type (always 0) */
1204
png_byte interlaced PNG_DEPSTRUCT; /* PNG_INTERLACE_NONE,
1205
PNG_INTERLACE_ADAM7 */
1206
png_byte pass PNG_DEPSTRUCT; /* current interlace pass (0 - 6) */
1207
png_byte do_filter PNG_DEPSTRUCT; /* row filter flags (see
1208
PNG_FILTER_ below ) */
1209
png_byte color_type PNG_DEPSTRUCT; /* color type of file */
1210
png_byte bit_depth PNG_DEPSTRUCT; /* bit depth of file */
1211
png_byte usr_bit_depth PNG_DEPSTRUCT; /* bit depth of users row */
1212
png_byte pixel_depth PNG_DEPSTRUCT; /* number of bits per pixel */
1213
png_byte channels PNG_DEPSTRUCT; /* number of channels in file */
1214
png_byte usr_channels PNG_DEPSTRUCT; /* channels at start of write */
1215
png_byte sig_bytes PNG_DEPSTRUCT; /* magic bytes read/written from
1218
#if defined(PNG_READ_FILLER_SUPPORTED) || defined(PNG_WRITE_FILLER_SUPPORTED)
1219
png_uint_16 filler PNG_DEPSTRUCT; /* filler bytes for pixel
1223
#ifdef PNG_bKGD_SUPPORTED
1224
png_byte background_gamma_type PNG_DEPSTRUCT;
1225
# ifdef PNG_FLOATING_POINT_SUPPORTED
1226
float background_gamma PNG_DEPSTRUCT;
1228
png_color_16 background PNG_DEPSTRUCT; /* background color in
1229
screen gamma space */
1230
#ifdef PNG_READ_GAMMA_SUPPORTED
1231
png_color_16 background_1 PNG_DEPSTRUCT; /* background normalized
1234
#endif /* PNG_bKGD_SUPPORTED */
1236
#ifdef PNG_WRITE_FLUSH_SUPPORTED
1237
png_flush_ptr output_flush_fn PNG_DEPSTRUCT; /* Function for flushing
1239
png_uint_32 flush_dist PNG_DEPSTRUCT; /* how many rows apart to flush,
1241
png_uint_32 flush_rows PNG_DEPSTRUCT; /* number of rows written since
1245
#if defined(PNG_READ_GAMMA_SUPPORTED) || defined(PNG_READ_BACKGROUND_SUPPORTED)
1246
int gamma_shift PNG_DEPSTRUCT; /* number of "insignificant" bits
1248
#ifdef PNG_FLOATING_POINT_SUPPORTED
1249
float gamma PNG_DEPSTRUCT; /* file gamma value */
1250
float screen_gamma PNG_DEPSTRUCT; /* screen gamma value
1251
(display_exponent) */
1255
#if defined(PNG_READ_GAMMA_SUPPORTED) || defined(PNG_READ_BACKGROUND_SUPPORTED)
1256
png_bytep gamma_table PNG_DEPSTRUCT; /* gamma table for 8-bit
1258
png_bytep gamma_from_1 PNG_DEPSTRUCT; /* converts from 1.0 to screen */
1259
png_bytep gamma_to_1 PNG_DEPSTRUCT; /* converts from file to 1.0 */
1260
png_uint_16pp gamma_16_table PNG_DEPSTRUCT; /* gamma table for 16-bit
1262
png_uint_16pp gamma_16_from_1 PNG_DEPSTRUCT; /* converts from 1.0 to
1264
png_uint_16pp gamma_16_to_1 PNG_DEPSTRUCT; /* converts from file to 1.0 */
1267
#if defined(PNG_READ_GAMMA_SUPPORTED) || defined(PNG_sBIT_SUPPORTED)
1268
png_color_8 sig_bit PNG_DEPSTRUCT; /* significant bits in each
1269
available channel */
1272
#if defined(PNG_READ_SHIFT_SUPPORTED) || defined(PNG_WRITE_SHIFT_SUPPORTED)
1273
png_color_8 shift PNG_DEPSTRUCT; /* shift for significant bit
1277
#if defined(PNG_tRNS_SUPPORTED) || defined(PNG_READ_BACKGROUND_SUPPORTED) \
1278
|| defined(PNG_READ_EXPAND_SUPPORTED) || defined(PNG_READ_BACKGROUND_SUPPORTED)
1279
png_bytep trans_alpha PNG_DEPSTRUCT; /* alpha values for
1281
png_color_16 trans_color PNG_DEPSTRUCT; /* transparent color for
1282
non-paletted files */
1285
png_read_status_ptr read_row_fn PNG_DEPSTRUCT; /* called after each
1287
png_write_status_ptr write_row_fn PNG_DEPSTRUCT; /* called after each
1289
#ifdef PNG_PROGRESSIVE_READ_SUPPORTED
1290
png_progressive_info_ptr info_fn PNG_DEPSTRUCT; /* called after header
1292
png_progressive_row_ptr row_fn PNG_DEPSTRUCT; /* called after each
1293
prog. row is decoded */
1294
png_progressive_end_ptr end_fn PNG_DEPSTRUCT; /* called after image
1296
png_bytep save_buffer_ptr PNG_DEPSTRUCT; /* current location in
1298
png_bytep save_buffer PNG_DEPSTRUCT; /* buffer for previously
1300
png_bytep current_buffer_ptr PNG_DEPSTRUCT; /* current location in
1302
png_bytep current_buffer PNG_DEPSTRUCT; /* buffer for recently
1304
png_uint_32 push_length PNG_DEPSTRUCT; /* size of current input
1306
png_uint_32 skip_length PNG_DEPSTRUCT; /* bytes to skip in
1308
png_size_t save_buffer_size PNG_DEPSTRUCT; /* amount of data now
1310
png_size_t save_buffer_max PNG_DEPSTRUCT; /* total size of
1312
png_size_t buffer_size PNG_DEPSTRUCT; /* total amount of
1313
available input data */
1314
png_size_t current_buffer_size PNG_DEPSTRUCT; /* amount of data now
1315
in current_buffer */
1316
int process_mode PNG_DEPSTRUCT; /* what push library
1317
is currently doing */
1318
int cur_palette PNG_DEPSTRUCT; /* current push library
1321
# ifdef PNG_TEXT_SUPPORTED
1322
png_size_t current_text_size PNG_DEPSTRUCT; /* current size of
1324
png_size_t current_text_left PNG_DEPSTRUCT; /* how much text left
1326
png_charp current_text PNG_DEPSTRUCT; /* current text chunk
1328
png_charp current_text_ptr PNG_DEPSTRUCT; /* current location
1330
# endif /* PNG_PROGRESSIVE_READ_SUPPORTED && PNG_TEXT_SUPPORTED */
1332
#endif /* PNG_PROGRESSIVE_READ_SUPPORTED */
1334
#if defined(__TURBOC__) && !defined(_Windows) && !defined(__FLAT__)
1335
/* For the Borland special 64K segment handler */
1336
png_bytepp offset_table_ptr PNG_DEPSTRUCT;
1337
png_bytep offset_table PNG_DEPSTRUCT;
1338
png_uint_16 offset_table_number PNG_DEPSTRUCT;
1339
png_uint_16 offset_table_count PNG_DEPSTRUCT;
1340
png_uint_16 offset_table_count_free PNG_DEPSTRUCT;
1343
#ifdef PNG_READ_QUANTIZE_SUPPORTED
1344
png_bytep palette_lookup PNG_DEPSTRUCT; /* lookup table for quantizing */
1345
png_bytep quantize_index PNG_DEPSTRUCT; /* index translation for palette
1349
#if defined(PNG_READ_QUANTIZE_SUPPORTED) || defined(PNG_hIST_SUPPORTED)
1350
png_uint_16p hist PNG_DEPSTRUCT; /* histogram */
1353
#ifdef PNG_WRITE_WEIGHTED_FILTER_SUPPORTED
1354
png_byte heuristic_method PNG_DEPSTRUCT; /* heuristic for row
1356
png_byte num_prev_filters PNG_DEPSTRUCT; /* number of weights
1357
for previous rows */
1358
png_bytep prev_filters PNG_DEPSTRUCT; /* filter type(s) of
1360
png_uint_16p filter_weights PNG_DEPSTRUCT; /* weight(s) for previous
1362
png_uint_16p inv_filter_weights PNG_DEPSTRUCT; /* 1/weight(s) for
1364
png_uint_16p filter_costs PNG_DEPSTRUCT; /* relative filter
1366
png_uint_16p inv_filter_costs PNG_DEPSTRUCT; /* 1/relative filter
1370
#ifdef PNG_TIME_RFC1123_SUPPORTED
1371
png_charp time_buffer PNG_DEPSTRUCT; /* String to hold RFC 1123 time text */
1374
/* New members added in libpng-1.0.6 */
1376
png_uint_32 free_me PNG_DEPSTRUCT; /* flags items libpng is
1377
responsible for freeing */
1379
#ifdef PNG_USER_CHUNKS_SUPPORTED
1380
png_voidp user_chunk_ptr PNG_DEPSTRUCT;
1381
png_user_chunk_ptr read_user_chunk_fn PNG_DEPSTRUCT; /* user read
1385
#ifdef PNG_HANDLE_AS_UNKNOWN_SUPPORTED
1386
int num_chunk_list PNG_DEPSTRUCT;
1387
png_bytep chunk_list PNG_DEPSTRUCT;
1390
/* New members added in libpng-1.0.3 */
1391
#ifdef PNG_READ_RGB_TO_GRAY_SUPPORTED
1392
png_byte rgb_to_gray_status PNG_DEPSTRUCT;
1393
/* These were changed from png_byte in libpng-1.0.6 */
1394
png_uint_16 rgb_to_gray_red_coeff PNG_DEPSTRUCT;
1395
png_uint_16 rgb_to_gray_green_coeff PNG_DEPSTRUCT;
1396
png_uint_16 rgb_to_gray_blue_coeff PNG_DEPSTRUCT;
1399
/* New member added in libpng-1.0.4 (renamed in 1.0.9) */
1400
#if defined(PNG_MNG_FEATURES_SUPPORTED) || \
1401
defined(PNG_READ_EMPTY_PLTE_SUPPORTED) || \
1402
defined(PNG_WRITE_EMPTY_PLTE_SUPPORTED)
1403
/* Changed from png_byte to png_uint_32 at version 1.2.0 */
1404
png_uint_32 mng_features_permitted PNG_DEPSTRUCT;
1407
/* New member added in libpng-1.0.7 */
1408
#if defined(PNG_READ_GAMMA_SUPPORTED) || defined(PNG_READ_BACKGROUND_SUPPORTED)
1409
png_fixed_point int_gamma PNG_DEPSTRUCT;
1412
/* New member added in libpng-1.0.9, ifdef'ed out in 1.0.12, enabled in 1.2.0 */
1413
#ifdef PNG_MNG_FEATURES_SUPPORTED
1414
png_byte filter_type PNG_DEPSTRUCT;
1417
/* New members added in libpng-1.2.0 */
1419
/* New members added in libpng-1.0.2 but first enabled by default in 1.2.0 */
1420
#ifdef PNG_USER_MEM_SUPPORTED
1421
png_voidp mem_ptr PNG_DEPSTRUCT; /* user supplied struct for
1423
png_malloc_ptr malloc_fn PNG_DEPSTRUCT; /* function for
1424
allocating memory */
1425
png_free_ptr free_fn PNG_DEPSTRUCT; /* function for
1429
/* New member added in libpng-1.0.13 and 1.2.0 */
1430
png_bytep big_row_buf PNG_DEPSTRUCT; /* buffer to save current
1433
#ifdef PNG_READ_QUANTIZE_SUPPORTED
1434
/* The following three members were added at version 1.0.14 and 1.2.4 */
1435
png_bytep quantize_sort PNG_DEPSTRUCT; /* working sort array */
1436
png_bytep index_to_palette PNG_DEPSTRUCT; /* where the original
1439
png_bytep palette_to_index PNG_DEPSTRUCT; /* which original index
1444
/* New members added in libpng-1.0.16 and 1.2.6 */
1445
png_byte compression_type PNG_DEPSTRUCT;
1447
#ifdef PNG_USER_LIMITS_SUPPORTED
1448
png_uint_32 user_width_max PNG_DEPSTRUCT;
1449
png_uint_32 user_height_max PNG_DEPSTRUCT;
1450
/* Added in libpng-1.4.0: Total number of sPLT, text, and unknown
1451
* chunks that can be stored (0 means unlimited).
1453
png_uint_32 user_chunk_cache_max PNG_DEPSTRUCT;
1456
/* New member added in libpng-1.0.25 and 1.2.17 */
1457
#ifdef PNG_UNKNOWN_CHUNKS_SUPPORTED
1458
/* Storage for unknown chunk that the library doesn't recognize. */
1459
png_unknown_chunk unknown_chunk PNG_DEPSTRUCT;
1462
/* New members added in libpng-1.2.26 */
1463
png_uint_32 old_big_row_buf_size PNG_DEPSTRUCT;
1464
png_uint_32 old_prev_row_size PNG_DEPSTRUCT;
1466
/* New member added in libpng-1.2.30 */
1467
png_charp chunkdata PNG_DEPSTRUCT; /* buffer for reading chunk data */
1469
#ifdef PNG_IO_STATE_SUPPORTED
1470
/* New member added in libpng-1.4.0 */
1471
png_uint_32 io_state PNG_DEPSTRUCT;
1476
/* This triggers a compiler error in png.c, if png.c and png.h
1477
* do not agree upon the version number.
1479
typedef png_structp version_1_4_4;
1481
typedef png_struct FAR * FAR * png_structpp;
1483
/* Here are the function definitions most commonly used. This is not
1484
* the place to find out how to use libpng. See libpng.txt for the
1485
* full explanation, see example.c for the summary. This just provides
1486
* a simple one line description of the use of each function.
1489
/* Returns the version number of the library */
1490
PNG_EXPORT(png_uint_32,png_access_version_number) PNGARG((void));
1492
/* Tell lib we have already handled the first <num_bytes> magic bytes.
1493
* Handling more than 8 bytes from the beginning of the file is an error.
1495
PNG_EXPORT(void,png_set_sig_bytes) PNGARG((png_structp png_ptr,
1498
/* Check sig[start] through sig[start + num_to_check - 1] to see if it's a
1499
* PNG file. Returns zero if the supplied bytes match the 8-byte PNG
1500
* signature, and non-zero otherwise. Having num_to_check == 0 or
1501
* start > 7 will always fail (ie return non-zero).
1503
PNG_EXPORT(int,png_sig_cmp) PNGARG((png_bytep sig, png_size_t start,
1504
png_size_t num_to_check));
1506
/* Simple signature checking function. This is the same as calling
1507
* png_check_sig(sig, n) := !png_sig_cmp(sig, 0, n).
1509
#define png_check_sig(sig,n) !png_sig_cmp((sig), 0, (n))
1511
/* Allocate and initialize png_ptr struct for reading, and any other memory. */
1512
PNG_EXPORT(png_structp,png_create_read_struct)
1513
PNGARG((png_const_charp user_png_ver, png_voidp error_ptr,
1514
png_error_ptr error_fn, png_error_ptr warn_fn)) PNG_ALLOCATED;
1516
/* Allocate and initialize png_ptr struct for writing, and any other memory */
1517
PNG_EXPORT(png_structp,png_create_write_struct)
1518
PNGARG((png_const_charp user_png_ver, png_voidp error_ptr,
1519
png_error_ptr error_fn, png_error_ptr warn_fn)) PNG_ALLOCATED;
1521
PNG_EXPORT(png_size_t,png_get_compression_buffer_size)
1522
PNGARG((png_structp png_ptr));
1524
PNG_EXPORT(void,png_set_compression_buffer_size)
1525
PNGARG((png_structp png_ptr, png_size_t size));
1527
/* Moved from pngconf.h in 1.4.0 and modified to ensure setjmp/longjmp
1530
#ifdef PNG_SETJMP_SUPPORTED
1531
/* This function returns the jmp_buf built in to *png_ptr. It must be
1532
* supplied with an appropriate 'longjmp' function to use on that jmp_buf
1533
* unless the default error function is overridden in which case NULL is
1534
* acceptable. The size of the jmp_buf is checked against the actual size
1535
* allocated by the library - the call will return NULL on a mismatch
1536
* indicating an ABI mismatch.
1538
PNG_EXPORT(jmp_buf*, png_set_longjmp_fn)
1539
PNGARG((png_structp png_ptr, png_longjmp_ptr longjmp_fn, size_t
1541
# define png_jmpbuf(png_ptr) \
1542
(*png_set_longjmp_fn((png_ptr), longjmp, sizeof (jmp_buf)))
1544
# define png_jmpbuf(png_ptr) \
1545
(LIBPNG_WAS_COMPILED_WITH__PNG_NO_SETJMP)
1548
#ifdef PNG_READ_SUPPORTED
1549
/* Reset the compression stream */
1550
PNG_EXPORT(int,png_reset_zstream) PNGARG((png_structp png_ptr));
1553
/* New functions added in libpng-1.0.2 (not enabled by default until 1.2.0) */
1554
#ifdef PNG_USER_MEM_SUPPORTED
1555
PNG_EXPORT(png_structp,png_create_read_struct_2)
1556
PNGARG((png_const_charp user_png_ver, png_voidp error_ptr,
1557
png_error_ptr error_fn, png_error_ptr warn_fn, png_voidp mem_ptr,
1558
png_malloc_ptr malloc_fn, png_free_ptr free_fn)) PNG_ALLOCATED;
1559
PNG_EXPORT(png_structp,png_create_write_struct_2)
1560
PNGARG((png_const_charp user_png_ver, png_voidp error_ptr,
1561
png_error_ptr error_fn, png_error_ptr warn_fn, png_voidp mem_ptr,
1562
png_malloc_ptr malloc_fn, png_free_ptr free_fn)) PNG_ALLOCATED;
1565
/* Write the PNG file signature. */
1566
PNG_EXPORT(void,png_write_sig) PNGARG((png_structp png_ptr));
1568
/* Write a PNG chunk - size, type, (optional) data, CRC. */
1569
PNG_EXPORT(void,png_write_chunk) PNGARG((png_structp png_ptr,
1570
png_bytep chunk_name, png_bytep data, png_size_t length));
1572
/* Write the start of a PNG chunk - length and chunk name. */
1573
PNG_EXPORT(void,png_write_chunk_start) PNGARG((png_structp png_ptr,
1574
png_bytep chunk_name, png_uint_32 length));
1576
/* Write the data of a PNG chunk started with png_write_chunk_start(). */
1577
PNG_EXPORT(void,png_write_chunk_data) PNGARG((png_structp png_ptr,
1578
png_bytep data, png_size_t length));
1580
/* Finish a chunk started with png_write_chunk_start() (includes CRC). */
1581
PNG_EXPORT(void,png_write_chunk_end) PNGARG((png_structp png_ptr));
1583
/* Allocate and initialize the info structure */
1584
PNG_EXPORT(png_infop,png_create_info_struct)
1585
PNGARG((png_structp png_ptr)) PNG_ALLOCATED;
1587
PNG_EXPORT(void,png_info_init_3) PNGARG((png_infopp info_ptr,
1588
png_size_t png_info_struct_size));
1590
/* Writes all the PNG information before the image. */
1591
PNG_EXPORT(void,png_write_info_before_PLTE) PNGARG((png_structp png_ptr,
1592
png_infop info_ptr));
1593
PNG_EXPORT(void,png_write_info) PNGARG((png_structp png_ptr,
1594
png_infop info_ptr));
1596
#ifdef PNG_SEQUENTIAL_READ_SUPPORTED
1597
/* Read the information before the actual image data. */
1598
PNG_EXPORT(void,png_read_info) PNGARG((png_structp png_ptr,
1599
png_infop info_ptr));
1602
#ifdef PNG_TIME_RFC1123_SUPPORTED
1603
PNG_EXPORT(png_charp,png_convert_to_rfc1123)
1604
PNGARG((png_structp png_ptr, png_timep ptime));
1607
#ifdef PNG_CONVERT_tIME_SUPPORTED
1608
/* Convert from a struct tm to png_time */
1609
PNG_EXPORT(void,png_convert_from_struct_tm) PNGARG((png_timep ptime,
1610
struct tm FAR * ttime));
1612
/* Convert from time_t to png_time. Uses gmtime() */
1613
PNG_EXPORT(void,png_convert_from_time_t) PNGARG((png_timep ptime,
1615
#endif /* PNG_CONVERT_tIME_SUPPORTED */
1617
#ifdef PNG_READ_EXPAND_SUPPORTED
1618
/* Expand data to 24-bit RGB, or 8-bit grayscale, with alpha if available. */
1619
PNG_EXPORT(void,png_set_expand) PNGARG((png_structp png_ptr));
1620
PNG_EXPORT(void,png_set_expand_gray_1_2_4_to_8) PNGARG((png_structp
1622
PNG_EXPORT(void,png_set_palette_to_rgb) PNGARG((png_structp png_ptr));
1623
PNG_EXPORT(void,png_set_tRNS_to_alpha) PNGARG((png_structp png_ptr));
1626
#if defined(PNG_READ_BGR_SUPPORTED) || defined(PNG_WRITE_BGR_SUPPORTED)
1627
/* Use blue, green, red order for pixels. */
1628
PNG_EXPORT(void,png_set_bgr) PNGARG((png_structp png_ptr));
1631
#ifdef PNG_READ_GRAY_TO_RGB_SUPPORTED
1632
/* Expand the grayscale to 24-bit RGB if necessary. */
1633
PNG_EXPORT(void,png_set_gray_to_rgb) PNGARG((png_structp png_ptr));
1636
#ifdef PNG_READ_RGB_TO_GRAY_SUPPORTED
1637
/* Reduce RGB to grayscale. */
1638
#ifdef PNG_FLOATING_POINT_SUPPORTED
1639
PNG_EXPORT(void,png_set_rgb_to_gray) PNGARG((png_structp png_ptr,
1640
int error_action, double red, double green ));
1642
PNG_EXPORT(void,png_set_rgb_to_gray_fixed) PNGARG((png_structp png_ptr,
1643
int error_action, png_fixed_point red, png_fixed_point green ));
1644
PNG_EXPORT(png_byte,png_get_rgb_to_gray_status) PNGARG((png_structp
1648
PNG_EXPORT(void,png_build_grayscale_palette) PNGARG((int bit_depth,
1649
png_colorp palette));
1651
#ifdef PNG_READ_STRIP_ALPHA_SUPPORTED
1652
PNG_EXPORT(void,png_set_strip_alpha) PNGARG((png_structp png_ptr));
1655
#if defined(PNG_READ_SWAP_ALPHA_SUPPORTED) || \
1656
defined(PNG_WRITE_SWAP_ALPHA_SUPPORTED)
1657
PNG_EXPORT(void,png_set_swap_alpha) PNGARG((png_structp png_ptr));
1660
#if defined(PNG_READ_INVERT_ALPHA_SUPPORTED) || \
1661
defined(PNG_WRITE_INVERT_ALPHA_SUPPORTED)
1662
PNG_EXPORT(void,png_set_invert_alpha) PNGARG((png_structp png_ptr));
1665
#if defined(PNG_READ_FILLER_SUPPORTED) || defined(PNG_WRITE_FILLER_SUPPORTED)
1666
/* Add a filler byte to 8-bit Gray or 24-bit RGB images. */
1667
PNG_EXPORT(void,png_set_filler) PNGARG((png_structp png_ptr,
1668
png_uint_32 filler, int flags));
1669
/* The values of the PNG_FILLER_ defines should NOT be changed */
1670
#define PNG_FILLER_BEFORE 0
1671
#define PNG_FILLER_AFTER 1
1672
/* Add an alpha byte to 8-bit Gray or 24-bit RGB images. */
1673
PNG_EXPORT(void,png_set_add_alpha) PNGARG((png_structp png_ptr,
1674
png_uint_32 filler, int flags));
1675
#endif /* PNG_READ_FILLER_SUPPORTED || PNG_WRITE_FILLER_SUPPORTED */
1677
#if defined(PNG_READ_SWAP_SUPPORTED) || defined(PNG_WRITE_SWAP_SUPPORTED)
1678
/* Swap bytes in 16-bit depth files. */
1679
PNG_EXPORT(void,png_set_swap) PNGARG((png_structp png_ptr));
1682
#if defined(PNG_READ_PACK_SUPPORTED) || defined(PNG_WRITE_PACK_SUPPORTED)
1683
/* Use 1 byte per pixel in 1, 2, or 4-bit depth files. */
1684
PNG_EXPORT(void,png_set_packing) PNGARG((png_structp png_ptr));
1687
#if defined(PNG_READ_PACKSWAP_SUPPORTED) || \
1688
defined(PNG_WRITE_PACKSWAP_SUPPORTED)
1689
/* Swap packing order of pixels in bytes. */
1690
PNG_EXPORT(void,png_set_packswap) PNGARG((png_structp png_ptr));
1693
#if defined(PNG_READ_SHIFT_SUPPORTED) || defined(PNG_WRITE_SHIFT_SUPPORTED)
1694
/* Converts files to legal bit depths. */
1695
PNG_EXPORT(void,png_set_shift) PNGARG((png_structp png_ptr,
1696
png_color_8p true_bits));
1699
#if defined(PNG_READ_INTERLACING_SUPPORTED) || \
1700
defined(PNG_WRITE_INTERLACING_SUPPORTED)
1701
/* Have the code handle the interlacing. Returns the number of passes. */
1702
PNG_EXPORT(int,png_set_interlace_handling) PNGARG((png_structp png_ptr));
1705
#if defined(PNG_READ_INVERT_SUPPORTED) || defined(PNG_WRITE_INVERT_SUPPORTED)
1706
/* Invert monochrome files */
1707
PNG_EXPORT(void,png_set_invert_mono) PNGARG((png_structp png_ptr));
1710
#ifdef PNG_READ_BACKGROUND_SUPPORTED
1711
/* Handle alpha and tRNS by replacing with a background color. */
1712
#ifdef PNG_FLOATING_POINT_SUPPORTED
1713
PNG_EXPORT(void,png_set_background) PNGARG((png_structp png_ptr,
1714
png_color_16p background_color, int background_gamma_code,
1715
int need_expand, double background_gamma));
1717
#define PNG_BACKGROUND_GAMMA_UNKNOWN 0
1718
#define PNG_BACKGROUND_GAMMA_SCREEN 1
1719
#define PNG_BACKGROUND_GAMMA_FILE 2
1720
#define PNG_BACKGROUND_GAMMA_UNIQUE 3
1723
#ifdef PNG_READ_16_TO_8_SUPPORTED
1724
/* Strip the second byte of information from a 16-bit depth file. */
1725
PNG_EXPORT(void,png_set_strip_16) PNGARG((png_structp png_ptr));
1728
#ifdef PNG_READ_QUANTIZE_SUPPORTED
1729
/* Turn on quantizing, and reduce the palette to the number of colors
1730
* available. Prior to libpng-1.4.2, this was png_set_dither().
1732
PNG_EXPORT(void,png_set_quantize) PNGARG((png_structp png_ptr,
1733
png_colorp palette, int num_palette, int maximum_colors,
1734
png_uint_16p histogram, int full_quantize));
1736
/* This migration aid will be removed from libpng-1.5.0 */
1737
#define png_set_dither png_set_quantize
1739
#ifdef PNG_READ_GAMMA_SUPPORTED
1740
/* Handle gamma correction. Screen_gamma=(display_exponent) */
1741
#ifdef PNG_FLOATING_POINT_SUPPORTED
1742
PNG_EXPORT(void,png_set_gamma) PNGARG((png_structp png_ptr,
1743
double screen_gamma, double default_file_gamma));
1748
#ifdef PNG_WRITE_FLUSH_SUPPORTED
1749
/* Set how many lines between output flushes - 0 for no flushing */
1750
PNG_EXPORT(void,png_set_flush) PNGARG((png_structp png_ptr, int nrows));
1751
/* Flush the current PNG output buffer */
1752
PNG_EXPORT(void,png_write_flush) PNGARG((png_structp png_ptr));
1755
/* Optional update palette with requested transformations */
1756
PNG_EXPORT(void,png_start_read_image) PNGARG((png_structp png_ptr));
1758
/* Optional call to update the users info structure */
1759
PNG_EXPORT(void,png_read_update_info) PNGARG((png_structp png_ptr,
1760
png_infop info_ptr));
1762
#ifdef PNG_SEQUENTIAL_READ_SUPPORTED
1763
/* Read one or more rows of image data. */
1764
PNG_EXPORT(void,png_read_rows) PNGARG((png_structp png_ptr,
1765
png_bytepp row, png_bytepp display_row, png_uint_32 num_rows));
1768
#ifdef PNG_SEQUENTIAL_READ_SUPPORTED
1769
/* Read a row of data. */
1770
PNG_EXPORT(void,png_read_row) PNGARG((png_structp png_ptr,
1772
png_bytep display_row));
1775
#ifdef PNG_SEQUENTIAL_READ_SUPPORTED
1776
/* Read the whole image into memory at once. */
1777
PNG_EXPORT(void,png_read_image) PNGARG((png_structp png_ptr,
1781
/* Write a row of image data */
1782
PNG_EXPORT(void,png_write_row) PNGARG((png_structp png_ptr,
1785
/* Write a few rows of image data */
1786
PNG_EXPORT(void,png_write_rows) PNGARG((png_structp png_ptr,
1787
png_bytepp row, png_uint_32 num_rows));
1789
/* Write the image data */
1790
PNG_EXPORT(void,png_write_image) PNGARG((png_structp png_ptr,
1793
/* Write the end of the PNG file. */
1794
PNG_EXPORT(void,png_write_end) PNGARG((png_structp png_ptr,
1795
png_infop info_ptr));
1797
#ifdef PNG_SEQUENTIAL_READ_SUPPORTED
1798
/* Read the end of the PNG file. */
1799
PNG_EXPORT(void,png_read_end) PNGARG((png_structp png_ptr,
1800
png_infop info_ptr));
1803
/* Free any memory associated with the png_info_struct */
1804
PNG_EXPORT(void,png_destroy_info_struct) PNGARG((png_structp png_ptr,
1805
png_infopp info_ptr_ptr));
1807
/* Free any memory associated with the png_struct and the png_info_structs */
1808
PNG_EXPORT(void,png_destroy_read_struct) PNGARG((png_structpp
1809
png_ptr_ptr, png_infopp info_ptr_ptr, png_infopp end_info_ptr_ptr));
1811
/* Free any memory associated with the png_struct and the png_info_structs */
1812
PNG_EXPORT(void,png_destroy_write_struct)
1813
PNGARG((png_structpp png_ptr_ptr, png_infopp info_ptr_ptr));
1815
/* Set the libpng method of handling chunk CRC errors */
1816
PNG_EXPORT(void,png_set_crc_action) PNGARG((png_structp png_ptr,
1817
int crit_action, int ancil_action));
1819
/* Values for png_set_crc_action() to say how to handle CRC errors in
1820
* ancillary and critical chunks, and whether to use the data contained
1821
* therein. Note that it is impossible to "discard" data in a critical
1822
* chunk. For versions prior to 0.90, the action was always error/quit,
1823
* whereas in version 0.90 and later, the action for CRC errors in ancillary
1824
* chunks is warn/discard. These values should NOT be changed.
1826
* value action:critical action:ancillary
1828
#define PNG_CRC_DEFAULT 0 /* error/quit warn/discard data */
1829
#define PNG_CRC_ERROR_QUIT 1 /* error/quit error/quit */
1830
#define PNG_CRC_WARN_DISCARD 2 /* (INVALID) warn/discard data */
1831
#define PNG_CRC_WARN_USE 3 /* warn/use data warn/use data */
1832
#define PNG_CRC_QUIET_USE 4 /* quiet/use data quiet/use data */
1833
#define PNG_CRC_NO_CHANGE 5 /* use current value use current value */
1835
/* These functions give the user control over the scan-line filtering in
1836
* libpng and the compression methods used by zlib. These functions are
1837
* mainly useful for testing, as the defaults should work with most users.
1838
* Those users who are tight on memory or want faster performance at the
1839
* expense of compression can modify them. See the compression library
1840
* header file (zlib.h) for an explination of the compression functions.
1843
/* Set the filtering method(s) used by libpng. Currently, the only valid
1844
* value for "method" is 0.
1846
PNG_EXPORT(void,png_set_filter) PNGARG((png_structp png_ptr, int method,
1849
/* Flags for png_set_filter() to say which filters to use. The flags
1850
* are chosen so that they don't conflict with real filter types
1851
* below, in case they are supplied instead of the #defined constants.
1852
* These values should NOT be changed.
1854
#define PNG_NO_FILTERS 0x00
1855
#define PNG_FILTER_NONE 0x08
1856
#define PNG_FILTER_SUB 0x10
1857
#define PNG_FILTER_UP 0x20
1858
#define PNG_FILTER_AVG 0x40
1859
#define PNG_FILTER_PAETH 0x80
1860
#define PNG_ALL_FILTERS (PNG_FILTER_NONE | PNG_FILTER_SUB | PNG_FILTER_UP | \
1861
PNG_FILTER_AVG | PNG_FILTER_PAETH)
1863
/* Filter values (not flags) - used in pngwrite.c, pngwutil.c for now.
1864
* These defines should NOT be changed.
1866
#define PNG_FILTER_VALUE_NONE 0
1867
#define PNG_FILTER_VALUE_SUB 1
1868
#define PNG_FILTER_VALUE_UP 2
1869
#define PNG_FILTER_VALUE_AVG 3
1870
#define PNG_FILTER_VALUE_PAETH 4
1871
#define PNG_FILTER_VALUE_LAST 5
1873
#ifdef PNG_WRITE_WEIGHTED_FILTER_SUPPORTED /* EXPERIMENTAL */
1874
/* The "heuristic_method" is given by one of the PNG_FILTER_HEURISTIC_
1875
* defines, either the default (minimum-sum-of-absolute-differences), or
1876
* the experimental method (weighted-minimum-sum-of-absolute-differences).
1878
* Weights are factors >= 1.0, indicating how important it is to keep the
1879
* filter type consistent between rows. Larger numbers mean the current
1880
* filter is that many times as likely to be the same as the "num_weights"
1881
* previous filters. This is cumulative for each previous row with a weight.
1882
* There needs to be "num_weights" values in "filter_weights", or it can be
1883
* NULL if the weights aren't being specified. Weights have no influence on
1884
* the selection of the first row filter. Well chosen weights can (in theory)
1885
* improve the compression for a given image.
1887
* Costs are factors >= 1.0 indicating the relative decoding costs of a
1888
* filter type. Higher costs indicate more decoding expense, and are
1889
* therefore less likely to be selected over a filter with lower computational
1890
* costs. There needs to be a value in "filter_costs" for each valid filter
1891
* type (given by PNG_FILTER_VALUE_LAST), or it can be NULL if you aren't
1892
* setting the costs. Costs try to improve the speed of decompression without
1893
* unduly increasing the compressed image size.
1895
* A negative weight or cost indicates the default value is to be used, and
1896
* values in the range [0.0, 1.0) indicate the value is to remain unchanged.
1897
* The default values for both weights and costs are currently 1.0, but may
1898
* change if good general weighting/cost heuristics can be found. If both
1899
* the weights and costs are set to 1.0, this degenerates the WEIGHTED method
1900
* to the UNWEIGHTED method, but with added encoding time/computation.
1902
#ifdef PNG_FLOATING_POINT_SUPPORTED
1903
PNG_EXPORT(void,png_set_filter_heuristics) PNGARG((png_structp png_ptr,
1904
int heuristic_method, int num_weights, png_doublep filter_weights,
1905
png_doublep filter_costs));
1907
#endif /* PNG_WRITE_WEIGHTED_FILTER_SUPPORTED */
1909
/* Heuristic used for row filter selection. These defines should NOT be
1912
#define PNG_FILTER_HEURISTIC_DEFAULT 0 /* Currently "UNWEIGHTED" */
1913
#define PNG_FILTER_HEURISTIC_UNWEIGHTED 1 /* Used by libpng < 0.95 */
1914
#define PNG_FILTER_HEURISTIC_WEIGHTED 2 /* Experimental feature */
1915
#define PNG_FILTER_HEURISTIC_LAST 3 /* Not a valid value */
1917
/* Set the library compression level. Currently, valid values range from
1918
* 0 - 9, corresponding directly to the zlib compression levels 0 - 9
1919
* (0 - no compression, 9 - "maximal" compression). Note that tests have
1920
* shown that zlib compression levels 3-6 usually perform as well as level 9
1921
* for PNG images, and do considerably fewer caclulations. In the future,
1922
* these values may not correspond directly to the zlib compression levels.
1924
PNG_EXPORT(void,png_set_compression_level) PNGARG((png_structp png_ptr,
1927
PNG_EXPORT(void,png_set_compression_mem_level)
1928
PNGARG((png_structp png_ptr, int mem_level));
1930
PNG_EXPORT(void,png_set_compression_strategy)
1931
PNGARG((png_structp png_ptr, int strategy));
1933
PNG_EXPORT(void,png_set_compression_window_bits)
1934
PNGARG((png_structp png_ptr, int window_bits));
1936
PNG_EXPORT(void,png_set_compression_method) PNGARG((png_structp png_ptr,
1939
/* These next functions are called for input/output, memory, and error
1940
* handling. They are in the file pngrio.c, pngwio.c, and pngerror.c,
1941
* and call standard C I/O routines such as fread(), fwrite(), and
1942
* fprintf(). These functions can be made to use other I/O routines
1943
* at run time for those applications that need to handle I/O in a
1944
* different manner by calling png_set_???_fn(). See libpng.txt for
1948
#ifdef PNG_STDIO_SUPPORTED
1949
/* Initialize the input/output for the PNG file to the default functions. */
1950
PNG_EXPORT(void,png_init_io) PNGARG((png_structp png_ptr,
1954
/* Replace the (error and abort), and warning functions with user
1955
* supplied functions. If no messages are to be printed you must still
1956
* write and use replacement functions. The replacement error_fn should
1957
* still do a longjmp to the last setjmp location if you are using this
1958
* method of error handling. If error_fn or warning_fn is NULL, the
1959
* default function will be used.
1962
PNG_EXPORT(void,png_set_error_fn) PNGARG((png_structp png_ptr,
1963
png_voidp error_ptr, png_error_ptr error_fn, png_error_ptr warning_fn));
1965
/* Return the user pointer associated with the error functions */
1966
PNG_EXPORT(png_voidp,png_get_error_ptr) PNGARG((png_structp png_ptr));
1968
/* Replace the default data output functions with a user supplied one(s).
1969
* If buffered output is not used, then output_flush_fn can be set to NULL.
1970
* If PNG_WRITE_FLUSH_SUPPORTED is not defined at libpng compile time
1971
* output_flush_fn will be ignored (and thus can be NULL).
1972
* It is probably a mistake to use NULL for output_flush_fn if
1973
* write_data_fn is not also NULL unless you have built libpng with
1974
* PNG_WRITE_FLUSH_SUPPORTED undefined, because in this case libpng's
1975
* default flush function, which uses the standard *FILE structure, will
1978
PNG_EXPORT(void,png_set_write_fn) PNGARG((png_structp png_ptr,
1979
png_voidp io_ptr, png_rw_ptr write_data_fn, png_flush_ptr output_flush_fn));
1981
/* Replace the default data input function with a user supplied one. */
1982
PNG_EXPORT(void,png_set_read_fn) PNGARG((png_structp png_ptr,
1983
png_voidp io_ptr, png_rw_ptr read_data_fn));
1985
/* Return the user pointer associated with the I/O functions */
1986
PNG_EXPORT(png_voidp,png_get_io_ptr) PNGARG((png_structp png_ptr));
1988
PNG_EXPORT(void,png_set_read_status_fn) PNGARG((png_structp png_ptr,
1989
png_read_status_ptr read_row_fn));
1991
PNG_EXPORT(void,png_set_write_status_fn) PNGARG((png_structp png_ptr,
1992
png_write_status_ptr write_row_fn));
1994
#ifdef PNG_USER_MEM_SUPPORTED
1995
/* Replace the default memory allocation functions with user supplied one(s). */
1996
PNG_EXPORT(void,png_set_mem_fn) PNGARG((png_structp png_ptr,
1997
png_voidp mem_ptr, png_malloc_ptr malloc_fn, png_free_ptr free_fn));
1998
/* Return the user pointer associated with the memory functions */
1999
PNG_EXPORT(png_voidp,png_get_mem_ptr) PNGARG((png_structp png_ptr));
2002
#ifdef PNG_READ_USER_TRANSFORM_SUPPORTED
2003
PNG_EXPORT(void,png_set_read_user_transform_fn) PNGARG((png_structp
2004
png_ptr, png_user_transform_ptr read_user_transform_fn));
2007
#ifdef PNG_WRITE_USER_TRANSFORM_SUPPORTED
2008
PNG_EXPORT(void,png_set_write_user_transform_fn) PNGARG((png_structp
2009
png_ptr, png_user_transform_ptr write_user_transform_fn));
2012
#if defined(PNG_READ_USER_TRANSFORM_SUPPORTED) || \
2013
defined(PNG_WRITE_USER_TRANSFORM_SUPPORTED)
2014
PNG_EXPORT(void,png_set_user_transform_info) PNGARG((png_structp
2015
png_ptr, png_voidp user_transform_ptr, int user_transform_depth,
2016
int user_transform_channels));
2017
/* Return the user pointer associated with the user transform functions */
2018
PNG_EXPORT(png_voidp,png_get_user_transform_ptr)
2019
PNGARG((png_structp png_ptr));
2022
#ifdef PNG_USER_CHUNKS_SUPPORTED
2023
PNG_EXPORT(void,png_set_read_user_chunk_fn) PNGARG((png_structp png_ptr,
2024
png_voidp user_chunk_ptr, png_user_chunk_ptr read_user_chunk_fn));
2025
PNG_EXPORT(png_voidp,png_get_user_chunk_ptr) PNGARG((png_structp
2029
#ifdef PNG_PROGRESSIVE_READ_SUPPORTED
2030
/* Sets the function callbacks for the push reader, and a pointer to a
2031
* user-defined structure available to the callback functions.
2033
PNG_EXPORT(void,png_set_progressive_read_fn) PNGARG((png_structp png_ptr,
2034
png_voidp progressive_ptr,
2035
png_progressive_info_ptr info_fn, png_progressive_row_ptr row_fn,
2036
png_progressive_end_ptr end_fn));
2038
/* Returns the user pointer associated with the push read functions */
2039
PNG_EXPORT(png_voidp,png_get_progressive_ptr)
2040
PNGARG((png_structp png_ptr));
2042
/* Function to be called when data becomes available */
2043
PNG_EXPORT(void,png_process_data) PNGARG((png_structp png_ptr,
2044
png_infop info_ptr, png_bytep buffer, png_size_t buffer_size));
2046
/* Function that combines rows. Not very much different than the
2047
* png_combine_row() call. Is this even used?????
2049
PNG_EXPORT(void,png_progressive_combine_row) PNGARG((png_structp png_ptr,
2050
png_bytep old_row, png_bytep new_row));
2051
#endif /* PNG_PROGRESSIVE_READ_SUPPORTED */
2053
PNG_EXPORT(png_voidp,png_malloc) PNGARG((png_structp png_ptr,
2054
png_alloc_size_t size)) PNG_ALLOCATED;
2055
/* Added at libpng version 1.4.0 */
2056
PNG_EXPORT(png_voidp,png_calloc) PNGARG((png_structp png_ptr,
2057
png_alloc_size_t size)) PNG_ALLOCATED;
2059
/* Added at libpng version 1.2.4 */
2060
PNG_EXPORT(png_voidp,png_malloc_warn) PNGARG((png_structp png_ptr,
2061
png_alloc_size_t size)) PNG_ALLOCATED;
2063
/* Frees a pointer allocated by png_malloc() */
2064
PNG_EXPORT(void,png_free) PNGARG((png_structp png_ptr, png_voidp ptr));
2066
/* Free data that was allocated internally */
2067
PNG_EXPORT(void,png_free_data) PNGARG((png_structp png_ptr,
2068
png_infop info_ptr, png_uint_32 free_me, int num));
2069
/* Reassign responsibility for freeing existing data, whether allocated
2070
* by libpng or by the application */
2071
PNG_EXPORT(void,png_data_freer) PNGARG((png_structp png_ptr,
2072
png_infop info_ptr, int freer, png_uint_32 mask));
2073
/* Assignments for png_data_freer */
2074
#define PNG_DESTROY_WILL_FREE_DATA 1
2075
#define PNG_SET_WILL_FREE_DATA 1
2076
#define PNG_USER_WILL_FREE_DATA 2
2077
/* Flags for png_ptr->free_me and info_ptr->free_me */
2078
#define PNG_FREE_HIST 0x0008
2079
#define PNG_FREE_ICCP 0x0010
2080
#define PNG_FREE_SPLT 0x0020
2081
#define PNG_FREE_ROWS 0x0040
2082
#define PNG_FREE_PCAL 0x0080
2083
#define PNG_FREE_SCAL 0x0100
2084
#define PNG_FREE_UNKN 0x0200
2085
#define PNG_FREE_LIST 0x0400
2086
#define PNG_FREE_PLTE 0x1000
2087
#define PNG_FREE_TRNS 0x2000
2088
#define PNG_FREE_TEXT 0x4000
2089
#define PNG_FREE_ALL 0x7fff
2090
#define PNG_FREE_MUL 0x4220 /* PNG_FREE_SPLT|PNG_FREE_TEXT|PNG_FREE_UNKN */
2092
#ifdef PNG_USER_MEM_SUPPORTED
2093
PNG_EXPORT(png_voidp,png_malloc_default) PNGARG((png_structp png_ptr,
2094
png_alloc_size_t size)) PNG_ALLOCATED;
2095
PNG_EXPORT(void,png_free_default) PNGARG((png_structp png_ptr,
2099
#ifndef PNG_NO_ERROR_TEXT
2100
/* Fatal error in PNG image of libpng - can't continue */
2101
PNG_EXPORT(void,png_error) PNGARG((png_structp png_ptr,
2102
png_const_charp error_message)) PNG_NORETURN;
2104
/* The same, but the chunk name is prepended to the error string. */
2105
PNG_EXPORT(void,png_chunk_error) PNGARG((png_structp png_ptr,
2106
png_const_charp error_message)) PNG_NORETURN;
2109
/* Fatal error in PNG image of libpng - can't continue */
2110
PNG_EXPORT(void,png_err) PNGARG((png_structp png_ptr)) PNG_NORETURN;
2113
/* Non-fatal error in libpng. Can continue, but may have a problem. */
2114
PNG_EXPORT(void,png_warning) PNGARG((png_structp png_ptr,
2115
png_const_charp warning_message));
2117
/* Non-fatal error in libpng, chunk name is prepended to message. */
2118
PNG_EXPORT(void,png_chunk_warning) PNGARG((png_structp png_ptr,
2119
png_const_charp warning_message));
2121
#ifdef PNG_BENIGN_ERRORS_SUPPORTED
2122
/* Benign error in libpng. Can continue, but may have a problem.
2123
* User can choose whether to handle as a fatal error or as a warning. */
2124
PNG_EXPORT(void,png_benign_error) PNGARG((png_structp png_ptr,
2125
png_const_charp warning_message));
2127
/* Same, chunk name is prepended to message. */
2128
PNG_EXPORT(void,png_chunk_benign_error) PNGARG((png_structp png_ptr,
2129
png_const_charp warning_message));
2131
PNG_EXPORT(void,png_set_benign_errors) PNGARG((png_structp
2132
png_ptr, int allowed));
2135
/* The png_set_<chunk> functions are for storing values in the png_info_struct.
2136
* Similarly, the png_get_<chunk> calls are used to read values from the
2137
* png_info_struct, either storing the parameters in the passed variables, or
2138
* setting pointers into the png_info_struct where the data is stored. The
2139
* png_get_<chunk> functions return a non-zero value if the data was available
2140
* in info_ptr, or return zero and do not change any of the parameters if the
2141
* data was not available.
2143
* These functions should be used instead of directly accessing png_info
2144
* to avoid problems with future changes in the size and internal layout of
2147
/* Returns "flag" if chunk data is valid in info_ptr. */
2148
PNG_EXPORT(png_uint_32,png_get_valid) PNGARG((png_structp png_ptr,
2149
png_infop info_ptr, png_uint_32 flag));
2151
/* Returns number of bytes needed to hold a transformed row. */
2152
PNG_EXPORT(png_size_t,png_get_rowbytes) PNGARG((png_structp png_ptr,
2153
png_infop info_ptr));
2155
#ifdef PNG_INFO_IMAGE_SUPPORTED
2156
/* Returns row_pointers, which is an array of pointers to scanlines that was
2157
* returned from png_read_png().
2159
PNG_EXPORT(png_bytepp,png_get_rows) PNGARG((png_structp png_ptr,
2160
png_infop info_ptr));
2161
/* Set row_pointers, which is an array of pointers to scanlines for use
2162
* by png_write_png().
2164
PNG_EXPORT(void,png_set_rows) PNGARG((png_structp png_ptr,
2165
png_infop info_ptr, png_bytepp row_pointers));
2168
/* Returns number of color channels in image. */
2169
PNG_EXPORT(png_byte,png_get_channels) PNGARG((png_structp png_ptr,
2170
png_infop info_ptr));
2172
#ifdef PNG_EASY_ACCESS_SUPPORTED
2173
/* Returns image width in pixels. */
2174
PNG_EXPORT(png_uint_32, png_get_image_width) PNGARG((png_structp
2175
png_ptr, png_infop info_ptr));
2177
/* Returns image height in pixels. */
2178
PNG_EXPORT(png_uint_32, png_get_image_height) PNGARG((png_structp
2179
png_ptr, png_infop info_ptr));
2181
/* Returns image bit_depth. */
2182
PNG_EXPORT(png_byte, png_get_bit_depth) PNGARG((png_structp
2183
png_ptr, png_infop info_ptr));
2185
/* Returns image color_type. */
2186
PNG_EXPORT(png_byte, png_get_color_type) PNGARG((png_structp
2187
png_ptr, png_infop info_ptr));
2189
/* Returns image filter_type. */
2190
PNG_EXPORT(png_byte, png_get_filter_type) PNGARG((png_structp
2191
png_ptr, png_infop info_ptr));
2193
/* Returns image interlace_type. */
2194
PNG_EXPORT(png_byte, png_get_interlace_type) PNGARG((png_structp
2195
png_ptr, png_infop info_ptr));
2197
/* Returns image compression_type. */
2198
PNG_EXPORT(png_byte, png_get_compression_type) PNGARG((png_structp
2199
png_ptr, png_infop info_ptr));
2201
/* Returns image resolution in pixels per meter, from pHYs chunk data. */
2202
PNG_EXPORT(png_uint_32, png_get_pixels_per_meter) PNGARG((png_structp
2203
png_ptr, png_infop info_ptr));
2204
PNG_EXPORT(png_uint_32, png_get_x_pixels_per_meter) PNGARG((png_structp
2205
png_ptr, png_infop info_ptr));
2206
PNG_EXPORT(png_uint_32, png_get_y_pixels_per_meter) PNGARG((png_structp
2207
png_ptr, png_infop info_ptr));
2209
/* Returns pixel aspect ratio, computed from pHYs chunk data. */
2210
#ifdef PNG_FLOATING_POINT_SUPPORTED
2211
PNG_EXPORT(float, png_get_pixel_aspect_ratio) PNGARG((png_structp
2212
png_ptr, png_infop info_ptr));
2215
/* Returns image x, y offset in pixels or microns, from oFFs chunk data. */
2216
PNG_EXPORT(png_int_32, png_get_x_offset_pixels) PNGARG((png_structp
2217
png_ptr, png_infop info_ptr));
2218
PNG_EXPORT(png_int_32, png_get_y_offset_pixels) PNGARG((png_structp
2219
png_ptr, png_infop info_ptr));
2220
PNG_EXPORT(png_int_32, png_get_x_offset_microns) PNGARG((png_structp
2221
png_ptr, png_infop info_ptr));
2222
PNG_EXPORT(png_int_32, png_get_y_offset_microns) PNGARG((png_structp
2223
png_ptr, png_infop info_ptr));
2225
#endif /* PNG_EASY_ACCESS_SUPPORTED */
2227
/* Returns pointer to signature string read from PNG header */
2228
PNG_EXPORT(png_bytep,png_get_signature) PNGARG((png_structp png_ptr,
2229
png_infop info_ptr));
2231
#ifdef PNG_bKGD_SUPPORTED
2232
PNG_EXPORT(png_uint_32,png_get_bKGD) PNGARG((png_structp png_ptr,
2233
png_infop info_ptr, png_color_16p *background));
2236
#ifdef PNG_bKGD_SUPPORTED
2237
PNG_EXPORT(void,png_set_bKGD) PNGARG((png_structp png_ptr,
2238
png_infop info_ptr, png_color_16p background));
2241
#ifdef PNG_cHRM_SUPPORTED
2242
#ifdef PNG_FLOATING_POINT_SUPPORTED
2243
PNG_EXPORT(png_uint_32,png_get_cHRM) PNGARG((png_structp png_ptr,
2244
png_infop info_ptr, double *white_x, double *white_y, double *red_x,
2245
double *red_y, double *green_x, double *green_y, double *blue_x,
2248
#ifdef PNG_FIXED_POINT_SUPPORTED
2249
PNG_EXPORT(png_uint_32,png_get_cHRM_fixed) PNGARG((png_structp png_ptr,
2250
png_infop info_ptr, png_fixed_point *int_white_x, png_fixed_point
2251
*int_white_y, png_fixed_point *int_red_x, png_fixed_point *int_red_y,
2252
png_fixed_point *int_green_x, png_fixed_point *int_green_y, png_fixed_point
2253
*int_blue_x, png_fixed_point *int_blue_y));
2257
#ifdef PNG_cHRM_SUPPORTED
2258
#ifdef PNG_FLOATING_POINT_SUPPORTED
2259
PNG_EXPORT(void,png_set_cHRM) PNGARG((png_structp png_ptr,
2260
png_infop info_ptr, double white_x, double white_y, double red_x,
2261
double red_y, double green_x, double green_y, double blue_x, double blue_y));
2263
#ifdef PNG_FIXED_POINT_SUPPORTED
2264
PNG_EXPORT(void,png_set_cHRM_fixed) PNGARG((png_structp png_ptr,
2265
png_infop info_ptr, png_fixed_point int_white_x, png_fixed_point int_white_y,
2266
png_fixed_point int_red_x, png_fixed_point int_red_y, png_fixed_point
2267
int_green_x, png_fixed_point int_green_y, png_fixed_point int_blue_x,
2268
png_fixed_point int_blue_y));
2272
#ifdef PNG_gAMA_SUPPORTED
2273
#ifdef PNG_FLOATING_POINT_SUPPORTED
2274
PNG_EXPORT(png_uint_32,png_get_gAMA) PNGARG((png_structp png_ptr,
2275
png_infop info_ptr, double *file_gamma));
2277
PNG_EXPORT(png_uint_32,png_get_gAMA_fixed) PNGARG((png_structp png_ptr,
2278
png_infop info_ptr, png_fixed_point *int_file_gamma));
2281
#ifdef PNG_gAMA_SUPPORTED
2282
#ifdef PNG_FLOATING_POINT_SUPPORTED
2283
PNG_EXPORT(void,png_set_gAMA) PNGARG((png_structp png_ptr,
2284
png_infop info_ptr, double file_gamma));
2286
PNG_EXPORT(void,png_set_gAMA_fixed) PNGARG((png_structp png_ptr,
2287
png_infop info_ptr, png_fixed_point int_file_gamma));
2290
#ifdef PNG_hIST_SUPPORTED
2291
PNG_EXPORT(png_uint_32,png_get_hIST) PNGARG((png_structp png_ptr,
2292
png_infop info_ptr, png_uint_16p *hist));
2295
#ifdef PNG_hIST_SUPPORTED
2296
PNG_EXPORT(void,png_set_hIST) PNGARG((png_structp png_ptr,
2297
png_infop info_ptr, png_uint_16p hist));
2300
PNG_EXPORT(png_uint_32,png_get_IHDR) PNGARG((png_structp png_ptr,
2301
png_infop info_ptr, png_uint_32 *width, png_uint_32 *height,
2302
int *bit_depth, int *color_type, int *interlace_method,
2303
int *compression_method, int *filter_method));
2305
PNG_EXPORT(void,png_set_IHDR) PNGARG((png_structp png_ptr,
2306
png_infop info_ptr, png_uint_32 width, png_uint_32 height, int bit_depth,
2307
int color_type, int interlace_method, int compression_method,
2308
int filter_method));
2310
#ifdef PNG_oFFs_SUPPORTED
2311
PNG_EXPORT(png_uint_32,png_get_oFFs) PNGARG((png_structp png_ptr,
2312
png_infop info_ptr, png_int_32 *offset_x, png_int_32 *offset_y,
2316
#ifdef PNG_oFFs_SUPPORTED
2317
PNG_EXPORT(void,png_set_oFFs) PNGARG((png_structp png_ptr,
2318
png_infop info_ptr, png_int_32 offset_x, png_int_32 offset_y,
2322
#ifdef PNG_pCAL_SUPPORTED
2323
PNG_EXPORT(png_uint_32,png_get_pCAL) PNGARG((png_structp png_ptr,
2324
png_infop info_ptr, png_charp *purpose, png_int_32 *X0, png_int_32 *X1,
2325
int *type, int *nparams, png_charp *units, png_charpp *params));
2328
#ifdef PNG_pCAL_SUPPORTED
2329
PNG_EXPORT(void,png_set_pCAL) PNGARG((png_structp png_ptr,
2330
png_infop info_ptr, png_charp purpose, png_int_32 X0, png_int_32 X1,
2331
int type, int nparams, png_charp units, png_charpp params));
2334
#ifdef PNG_pHYs_SUPPORTED
2335
PNG_EXPORT(png_uint_32,png_get_pHYs) PNGARG((png_structp png_ptr,
2336
png_infop info_ptr, png_uint_32 *res_x, png_uint_32 *res_y, int *unit_type));
2339
#ifdef PNG_pHYs_SUPPORTED
2340
PNG_EXPORT(void,png_set_pHYs) PNGARG((png_structp png_ptr,
2341
png_infop info_ptr, png_uint_32 res_x, png_uint_32 res_y, int unit_type));
2344
PNG_EXPORT(png_uint_32,png_get_PLTE) PNGARG((png_structp png_ptr,
2345
png_infop info_ptr, png_colorp *palette, int *num_palette));
2347
PNG_EXPORT(void,png_set_PLTE) PNGARG((png_structp png_ptr,
2348
png_infop info_ptr, png_colorp palette, int num_palette));
2350
#ifdef PNG_sBIT_SUPPORTED
2351
PNG_EXPORT(png_uint_32,png_get_sBIT) PNGARG((png_structp png_ptr,
2352
png_infop info_ptr, png_color_8p *sig_bit));
2355
#ifdef PNG_sBIT_SUPPORTED
2356
PNG_EXPORT(void,png_set_sBIT) PNGARG((png_structp png_ptr,
2357
png_infop info_ptr, png_color_8p sig_bit));
2360
#ifdef PNG_sRGB_SUPPORTED
2361
PNG_EXPORT(png_uint_32,png_get_sRGB) PNGARG((png_structp png_ptr,
2362
png_infop info_ptr, int *intent));
2365
#ifdef PNG_sRGB_SUPPORTED
2366
PNG_EXPORT(void,png_set_sRGB) PNGARG((png_structp png_ptr,
2367
png_infop info_ptr, int intent));
2368
PNG_EXPORT(void,png_set_sRGB_gAMA_and_cHRM) PNGARG((png_structp png_ptr,
2369
png_infop info_ptr, int intent));
2372
#ifdef PNG_iCCP_SUPPORTED
2373
PNG_EXPORT(png_uint_32,png_get_iCCP) PNGARG((png_structp png_ptr,
2374
png_infop info_ptr, png_charpp name, int *compression_type,
2375
png_charpp profile, png_uint_32 *proflen));
2376
/* Note to maintainer: profile should be png_bytepp */
2379
#ifdef PNG_iCCP_SUPPORTED
2380
PNG_EXPORT(void,png_set_iCCP) PNGARG((png_structp png_ptr,
2381
png_infop info_ptr, png_charp name, int compression_type,
2382
png_charp profile, png_uint_32 proflen));
2383
/* Note to maintainer: profile should be png_bytep */
2386
#ifdef PNG_sPLT_SUPPORTED
2387
PNG_EXPORT(png_uint_32,png_get_sPLT) PNGARG((png_structp png_ptr,
2388
png_infop info_ptr, png_sPLT_tpp entries));
2391
#ifdef PNG_sPLT_SUPPORTED
2392
PNG_EXPORT(void,png_set_sPLT) PNGARG((png_structp png_ptr,
2393
png_infop info_ptr, png_sPLT_tp entries, int nentries));
2396
#ifdef PNG_TEXT_SUPPORTED
2397
/* png_get_text also returns the number of text chunks in *num_text */
2398
PNG_EXPORT(png_uint_32,png_get_text) PNGARG((png_structp png_ptr,
2399
png_infop info_ptr, png_textp *text_ptr, int *num_text));
2402
/* Note while png_set_text() will accept a structure whose text,
2403
* language, and translated keywords are NULL pointers, the structure
2404
* returned by png_get_text will always contain regular
2405
* zero-terminated C strings. They might be empty strings but
2406
* they will never be NULL pointers.
2409
#ifdef PNG_TEXT_SUPPORTED
2410
PNG_EXPORT(void,png_set_text) PNGARG((png_structp png_ptr,
2411
png_infop info_ptr, png_textp text_ptr, int num_text));
2414
#ifdef PNG_tIME_SUPPORTED
2415
PNG_EXPORT(png_uint_32,png_get_tIME) PNGARG((png_structp png_ptr,
2416
png_infop info_ptr, png_timep *mod_time));
2419
#ifdef PNG_tIME_SUPPORTED
2420
PNG_EXPORT(void,png_set_tIME) PNGARG((png_structp png_ptr,
2421
png_infop info_ptr, png_timep mod_time));
2424
#ifdef PNG_tRNS_SUPPORTED
2425
PNG_EXPORT(png_uint_32,png_get_tRNS) PNGARG((png_structp png_ptr,
2426
png_infop info_ptr, png_bytep *trans_alpha, int *num_trans,
2427
png_color_16p *trans_color));
2430
#ifdef PNG_tRNS_SUPPORTED
2431
PNG_EXPORT(void,png_set_tRNS) PNGARG((png_structp png_ptr,
2432
png_infop info_ptr, png_bytep trans_alpha, int num_trans,
2433
png_color_16p trans_color));
2436
#ifdef PNG_tRNS_SUPPORTED
2439
#ifdef PNG_sCAL_SUPPORTED
2440
#ifdef PNG_FLOATING_POINT_SUPPORTED
2441
PNG_EXPORT(png_uint_32,png_get_sCAL) PNGARG((png_structp png_ptr,
2442
png_infop info_ptr, int *unit, double *width, double *height));
2444
#ifdef PNG_FIXED_POINT_SUPPORTED
2445
PNG_EXPORT(png_uint_32,png_get_sCAL_s) PNGARG((png_structp png_ptr,
2446
png_infop info_ptr, int *unit, png_charpp swidth, png_charpp sheight));
2449
#endif /* PNG_sCAL_SUPPORTED */
2451
#ifdef PNG_sCAL_SUPPORTED
2452
#ifdef PNG_FLOATING_POINT_SUPPORTED
2453
PNG_EXPORT(void,png_set_sCAL) PNGARG((png_structp png_ptr,
2454
png_infop info_ptr, int unit, double width, double height));
2456
#ifdef PNG_FIXED_POINT_SUPPORTED
2457
PNG_EXPORT(void,png_set_sCAL_s) PNGARG((png_structp png_ptr,
2458
png_infop info_ptr, int unit, png_charp swidth, png_charp sheight));
2461
#endif /* PNG_sCAL_SUPPORTED || PNG_WRITE_sCAL_SUPPORTED */
2463
#ifdef PNG_HANDLE_AS_UNKNOWN_SUPPORTED
2464
/* Provide a list of chunks and how they are to be handled, if the built-in
2465
handling or default unknown chunk handling is not desired. Any chunks not
2466
listed will be handled in the default manner. The IHDR and IEND chunks
2468
keep = 0: follow default behaviour
2470
= 2: keep only if safe-to-copy
2471
= 3: keep even if unsafe-to-copy
2473
PNG_EXPORT(void, png_set_keep_unknown_chunks) PNGARG((png_structp
2474
png_ptr, int keep, png_bytep chunk_list, int num_chunks));
2475
PNG_EXPORT(int,png_handle_as_unknown) PNGARG((png_structp png_ptr, png_bytep
2478
#ifdef PNG_UNKNOWN_CHUNKS_SUPPORTED
2479
PNG_EXPORT(void, png_set_unknown_chunks) PNGARG((png_structp png_ptr,
2480
png_infop info_ptr, png_unknown_chunkp unknowns, int num_unknowns));
2481
PNG_EXPORT(void, png_set_unknown_chunk_location)
2482
PNGARG((png_structp png_ptr, png_infop info_ptr, int chunk, int location));
2483
PNG_EXPORT(png_uint_32,png_get_unknown_chunks) PNGARG((png_structp
2484
png_ptr, png_infop info_ptr, png_unknown_chunkpp entries));
2487
/* Png_free_data() will turn off the "valid" flag for anything it frees.
2488
* If you need to turn it off for a chunk that your application has freed,
2489
* you can use png_set_invalid(png_ptr, info_ptr, PNG_INFO_CHNK);
2491
PNG_EXPORT(void, png_set_invalid) PNGARG((png_structp png_ptr,
2492
png_infop info_ptr, int mask));
2494
#ifdef PNG_INFO_IMAGE_SUPPORTED
2495
/* The "params" pointer is currently not used and is for future expansion. */
2496
PNG_EXPORT(void, png_read_png) PNGARG((png_structp png_ptr,
2500
PNG_EXPORT(void, png_write_png) PNGARG((png_structp png_ptr,
2506
PNG_EXPORT(png_charp,png_get_copyright) PNGARG((png_structp png_ptr));
2507
PNG_EXPORT(png_charp,png_get_header_ver) PNGARG((png_structp png_ptr));
2508
PNG_EXPORT(png_charp,png_get_header_version) PNGARG((png_structp
2510
PNG_EXPORT(png_charp,png_get_libpng_ver) PNGARG((png_structp png_ptr));
2512
#ifdef PNG_MNG_FEATURES_SUPPORTED
2513
PNG_EXPORT(png_uint_32,png_permit_mng_features) PNGARG((png_structp
2514
png_ptr, png_uint_32 mng_features_permitted));
2517
/* For use in png_set_keep_unknown, added to version 1.2.6 */
2518
#define PNG_HANDLE_CHUNK_AS_DEFAULT 0
2519
#define PNG_HANDLE_CHUNK_NEVER 1
2520
#define PNG_HANDLE_CHUNK_IF_SAFE 2
2521
#define PNG_HANDLE_CHUNK_ALWAYS 3
2523
/* Strip the prepended error numbers ("#nnn ") from error and warning
2524
* messages before passing them to the error or warning handler.
2526
#ifdef PNG_ERROR_NUMBERS_SUPPORTED
2527
PNG_EXPORT(void,png_set_strip_error_numbers) PNGARG((png_structp
2528
png_ptr, png_uint_32 strip_mode));
2531
/* Added in libpng-1.2.6 */
2532
#ifdef PNG_SET_USER_LIMITS_SUPPORTED
2533
PNG_EXPORT(void,png_set_user_limits) PNGARG((png_structp
2534
png_ptr, png_uint_32 user_width_max, png_uint_32 user_height_max));
2535
PNG_EXPORT(png_uint_32,png_get_user_width_max) PNGARG((png_structp
2537
PNG_EXPORT(png_uint_32,png_get_user_height_max) PNGARG((png_structp
2539
/* Added in libpng-1.4.0 */
2540
PNG_EXPORT(void,png_set_chunk_cache_max) PNGARG((png_structp
2541
png_ptr, png_uint_32 user_chunk_cache_max));
2542
PNG_EXPORT(png_uint_32,png_get_chunk_cache_max)
2543
PNGARG((png_structp png_ptr));
2544
/* Added in libpng-1.4.1 */
2545
PNG_EXPORT(void,png_set_chunk_malloc_max) PNGARG((png_structp
2546
png_ptr, png_alloc_size_t user_chunk_cache_max));
2547
PNG_EXPORT(png_alloc_size_t,png_get_chunk_malloc_max)
2548
PNGARG((png_structp png_ptr));
2551
#if defined(PNG_INCH_CONVERSIONS) && defined(PNG_FLOATING_POINT_SUPPORTED)
2552
PNG_EXPORT(png_uint_32,png_get_pixels_per_inch) PNGARG((png_structp png_ptr,
2553
png_infop info_ptr));
2555
PNG_EXPORT(png_uint_32,png_get_x_pixels_per_inch) PNGARG((png_structp png_ptr,
2556
png_infop info_ptr));
2558
PNG_EXPORT(png_uint_32,png_get_y_pixels_per_inch) PNGARG((png_structp png_ptr,
2559
png_infop info_ptr));
2561
PNG_EXPORT(float,png_get_x_offset_inches) PNGARG((png_structp png_ptr,
2562
png_infop info_ptr));
2564
PNG_EXPORT(float,png_get_y_offset_inches) PNGARG((png_structp png_ptr,
2565
png_infop info_ptr));
2567
#ifdef PNG_pHYs_SUPPORTED
2568
PNG_EXPORT(png_uint_32,png_get_pHYs_dpi) PNGARG((png_structp png_ptr,
2569
png_infop info_ptr, png_uint_32 *res_x, png_uint_32 *res_y, int *unit_type));
2570
#endif /* PNG_pHYs_SUPPORTED */
2571
#endif /* PNG_INCH_CONVERSIONS && PNG_FLOATING_POINT_SUPPORTED */
2573
/* Added in libpng-1.4.0 */
2574
#ifdef PNG_IO_STATE_SUPPORTED
2575
PNG_EXPORT(png_uint_32,png_get_io_state) PNGARG((png_structp png_ptr));
2577
PNG_EXPORT(png_bytep,png_get_io_chunk_name)
2578
PNGARG((png_structp png_ptr));
2580
/* The flags returned by png_get_io_state() are the following: */
2581
#define PNG_IO_NONE 0x0000 /* no I/O at this moment */
2582
#define PNG_IO_READING 0x0001 /* currently reading */
2583
#define PNG_IO_WRITING 0x0002 /* currently writing */
2584
#define PNG_IO_SIGNATURE 0x0010 /* currently at the file signature */
2585
#define PNG_IO_CHUNK_HDR 0x0020 /* currently at the chunk header */
2586
#define PNG_IO_CHUNK_DATA 0x0040 /* currently at the chunk data */
2587
#define PNG_IO_CHUNK_CRC 0x0080 /* currently at the chunk crc */
2588
#define PNG_IO_MASK_OP 0x000f /* current operation: reading/writing */
2589
#define PNG_IO_MASK_LOC 0x00f0 /* current location: sig/hdr/data/crc */
2590
#endif /* ?PNG_IO_STATE_SUPPORTED */
2592
/* Maintainer: Put new public prototypes here ^, in libpng.3, and project
2596
#ifdef PNG_READ_COMPOSITE_NODIV_SUPPORTED
2597
/* With these routines we avoid an integer divide, which will be slower on
2598
* most machines. However, it does take more operations than the corresponding
2599
* divide method, so it may be slower on a few RISC systems. There are two
2600
* shifts (by 8 or 16 bits) and an addition, versus a single integer divide.
2602
* Note that the rounding factors are NOT supposed to be the same! 128 and
2603
* 32768 are correct for the NODIV code; 127 and 32767 are correct for the
2606
* [Optimized code by Greg Roelofs and Mark Adler...blame us for bugs. :-) ]
2609
/* fg and bg should be in `gamma 1.0' space; alpha is the opacity */
2611
# define png_composite(composite, fg, alpha, bg) \
2612
{ png_uint_16 temp = (png_uint_16)((png_uint_16)(fg) \
2613
* (png_uint_16)(alpha) \
2614
+ (png_uint_16)(bg)*(png_uint_16)(255 \
2615
- (png_uint_16)(alpha)) + (png_uint_16)128); \
2616
(composite) = (png_byte)((temp + (temp >> 8)) >> 8); }
2618
# define png_composite_16(composite, fg, alpha, bg) \
2619
{ png_uint_32 temp = (png_uint_32)((png_uint_32)(fg) \
2620
* (png_uint_32)(alpha) \
2621
+ (png_uint_32)(bg)*(png_uint_32)(65535L \
2622
- (png_uint_32)(alpha)) + (png_uint_32)32768L); \
2623
(composite) = (png_uint_16)((temp + (temp >> 16)) >> 16); }
2625
#else /* Standard method using integer division */
2627
# define png_composite(composite, fg, alpha, bg) \
2628
(composite) = (png_byte)(((png_uint_16)(fg) * (png_uint_16)(alpha) + \
2629
(png_uint_16)(bg) * (png_uint_16)(255 - (png_uint_16)(alpha)) + \
2630
(png_uint_16)127) / 255)
2632
# define png_composite_16(composite, fg, alpha, bg) \
2633
(composite) = (png_uint_16)(((png_uint_32)(fg) * (png_uint_32)(alpha) + \
2634
(png_uint_32)(bg)*(png_uint_32)(65535L - (png_uint_32)(alpha)) + \
2635
(png_uint_32)32767) / (png_uint_32)65535L)
2636
#endif /* PNG_READ_COMPOSITE_NODIV_SUPPORTED */
2638
#ifdef PNG_USE_READ_MACROS
2639
/* Inline macros to do direct reads of bytes from the input buffer.
2640
* The png_get_int_32() routine assumes we are using two's complement
2641
* format for negative values, which is almost certainly true.
2643
# define png_get_uint_32(buf) \
2644
(((png_uint_32)(*(buf)) << 24) + \
2645
((png_uint_32)(*((buf) + 1)) << 16) + \
2646
((png_uint_32)(*((buf) + 2)) << 8) + \
2647
((png_uint_32)(*((buf) + 3))))
2648
# define png_get_uint_16(buf) \
2649
(((png_uint_32)(*(buf)) << 8) + \
2650
((png_uint_32)(*((buf) + 1))))
2651
# define png_get_int_32(buf) \
2652
((png_int_32)((*(buf) & 0x80) \
2653
? -((png_int_32)((png_get_uint_32(buf) ^ 0xffffffff)+1)) \
2654
: (png_int_32)png_get_uint_32(buf)))
2656
PNG_EXPORT(png_uint_32,png_get_uint_32) PNGARG((png_bytep buf));
2657
PNG_EXPORT(png_uint_16,png_get_uint_16) PNGARG((png_bytep buf));
2658
#ifdef PNG_GET_INT_32_SUPPORTED
2659
PNG_EXPORT(png_int_32,png_get_int_32) PNGARG((png_bytep buf));
2662
PNG_EXPORT(png_uint_32,png_get_uint_31)
2663
PNGARG((png_structp png_ptr, png_bytep buf));
2664
/* No png_get_int_16 -- may be added if there's a real need for it. */
2666
/* Place a 32-bit number into a buffer in PNG byte order (big-endian). */
2667
PNG_EXPORT(void,png_save_uint_32)
2668
PNGARG((png_bytep buf, png_uint_32 i));
2669
PNG_EXPORT(void,png_save_int_32)
2670
PNGARG((png_bytep buf, png_int_32 i));
2672
/* Place a 16-bit number into a buffer in PNG byte order.
2673
* The parameter is declared unsigned int, not png_uint_16,
2674
* just to avoid potential problems on pre-ANSI C compilers.
2676
PNG_EXPORT(void,png_save_uint_16)
2677
PNGARG((png_bytep buf, unsigned int i));
2678
/* No png_save_int_16 -- may be added if there's a real need for it. */
2680
/* ************************************************************************* */
2682
/* Various modes of operation. Note that after an init, mode is set to
2683
* zero automatically when the structure is created.
2685
#define PNG_HAVE_IHDR 0x01
2686
#define PNG_HAVE_PLTE 0x02
2687
#define PNG_HAVE_IDAT 0x04
2688
#define PNG_AFTER_IDAT 0x08 /* Have complete zlib datastream */
2689
#define PNG_HAVE_IEND 0x10
2690
#define PNG_HAVE_gAMA 0x20
2691
#define PNG_HAVE_cHRM 0x40
2697
#endif /* PNG_VERSION_INFO_ONLY */
2698
/* Do not put anything past this line */
added
removed
source/Irrlicht/libpng/png.h
