2656 lines
110 KiB
C
2656 lines
110 KiB
C
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/* png.h - header file for PNG reference library
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*
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* libpng version 1.4.0beta33 - August 20, 2008
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* Copyright (c) 1998-2008 Glenn Randers-Pehrson
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* (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger)
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* (Version 0.88 Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.)
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*
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* 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 1.4.0beta33 - August 20, 2008: Glenn
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* See also "Contributing Authors", below.
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*
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* Note about libpng version numbers:
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*
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* Due to various miscommunications, unforeseen code incompatibilities
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* and occasional factors outside the authors' control, version numbering
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* on the library has not always been consistent and straightforward.
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* The following table summarizes matters since version 0.89c, which was
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* the first widely used release:
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*
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* source png.h png.h shared-lib
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* version string int version
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* ------- ------ ----- ----------
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* 0.89c "1.0 beta 3" 0.89 89 1.0.89
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* 0.90 "1.0 beta 4" 0.90 90 0.90 [should have been 2.0.90]
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* 0.95 "1.0 beta 5" 0.95 95 0.95 [should have been 2.0.95]
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* 0.96 "1.0 beta 6" 0.96 96 0.96 [should have been 2.0.96]
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* 0.97b "1.00.97 beta 7" 1.00.97 97 1.0.1 [should have been 2.0.97]
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* 0.97c 0.97 97 2.0.97
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* 0.98 0.98 98 2.0.98
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* 0.99 0.99 98 2.0.99
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* 0.99a-m 0.99 99 2.0.99
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* 1.00 1.00 100 2.1.0 [100 should be 10000]
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* 1.0.0 (from here on, the 100 2.1.0 [100 should be 10000]
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* 1.0.1 png.h string is 10001 2.1.0
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* 1.0.1a-e identical to the 10002 from here on, the shared library
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* 1.0.2 source version) 10002 is 2.V where V is the source code
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* 1.0.2a-b 10003 version, except as noted.
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* 1.0.3 10003
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* 1.0.3a-d 10004
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* 1.0.4 10004
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* 1.0.4a-f 10005
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* 1.0.5 (+ 2 patches) 10005
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* 1.0.5a-d 10006
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* 1.0.5e-r 10100 (not source compatible)
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* 1.0.5s-v 10006 (not binary compatible)
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* 1.0.6 (+ 3 patches) 10006 (still binary incompatible)
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* 1.0.6d-f 10007 (still binary incompatible)
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* 1.0.6g 10007
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* 1.0.6h 10007 10.6h (testing xy.z so-numbering)
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* 1.0.6i 10007 10.6i
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* 1.0.6j 10007 2.1.0.6j (incompatible with 1.0.0)
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* 1.0.7beta11-14 DLLNUM 10007 2.1.0.7beta11-14 (binary compatible)
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* 1.0.7beta15-18 1 10007 2.1.0.7beta15-18 (binary compatible)
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* 1.0.7rc1-2 1 10007 2.1.0.7rc1-2 (binary compatible)
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* 1.0.7 1 10007 (still compatible)
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* 1.0.8beta1-4 1 10008 2.1.0.8beta1-4
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* 1.0.8rc1 1 10008 2.1.0.8rc1
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* 1.0.8 1 10008 2.1.0.8
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* 1.0.9beta1-6 1 10009 2.1.0.9beta1-6
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* 1.0.9rc1 1 10009 2.1.0.9rc1
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* 1.0.9beta7-10 1 10009 2.1.0.9beta7-10
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* 1.0.9rc2 1 10009 2.1.0.9rc2
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* 1.0.9 1 10009 2.1.0.9
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* 1.0.10beta1 1 10010 2.1.0.10beta1
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* 1.0.10rc1 1 10010 2.1.0.10rc1
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* 1.0.10 1 10010 2.1.0.10
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* 1.0.11beta1-3 1 10011 2.1.0.11beta1-3
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* 1.0.11rc1 1 10011 2.1.0.11rc1
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* 1.0.11 1 10011 2.1.0.11
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* 1.0.12beta1-2 2 10012 2.1.0.12beta1-2
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* 1.0.12rc1 2 10012 2.1.0.12rc1
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* 1.0.12 2 10012 2.1.0.12
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* 1.1.0a-f - 10100 2.1.1.0a-f (branch abandoned)
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* 1.2.0beta1-2 2 10200 2.1.2.0beta1-2
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* 1.2.0beta3-5 3 10200 3.1.2.0beta3-5
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* 1.2.0rc1 3 10200 3.1.2.0rc1
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* 1.2.0 3 10200 3.1.2.0
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* 1.2.1beta1-4 3 10201 3.1.2.1beta1-4
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* 1.2.1rc1-2 3 10201 3.1.2.1rc1-2
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* 1.2.1 3 10201 3.1.2.1
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* 1.2.2beta1-6 12 10202 12.so.0.1.2.2beta1-6
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* 1.0.13beta1 10 10013 10.so.0.1.0.13beta1
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* 1.0.13rc1 10 10013 10.so.0.1.0.13rc1
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* 1.2.2rc1 12 10202 12.so.0.1.2.2rc1
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* 1.0.13 10 10013 10.so.0.1.0.13
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* 1.2.2 12 10202 12.so.0.1.2.2
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* 1.2.3rc1-6 12 10203 12.so.0.1.2.3rc1-6
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* 1.2.3 12 10203 12.so.0.1.2.3
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* 1.2.4beta1-3 13 10204 12.so.0.1.2.4beta1-3
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* 1.0.14rc1 13 10014 10.so.0.1.0.14rc1
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* 1.2.4rc1 13 10204 12.so.0.1.2.4rc1
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* 1.0.14 10 10014 10.so.0.1.0.14
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* 1.2.4 13 10204 12.so.0.1.2.4
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* 1.2.5beta1-2 13 10205 12.so.0.1.2.5beta1-2
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* 1.0.15rc1-3 10 10015 10.so.0.1.0.15rc1-3
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* 1.2.5rc1-3 13 10205 12.so.0.1.2.5rc1-3
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* 1.0.15 10 10015 10.so.0.1.0.15
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* 1.2.5 13 10205 12.so.0.1.2.5
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* 1.2.6beta1-4 13 10206 12.so.0.1.2.6beta1-4
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* 1.0.16 10 10016 10.so.0.1.0.16
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* 1.2.6 13 10206 12.so.0.1.2.6
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* 1.2.7beta1-2 13 10207 12.so.0.1.2.7beta1-2
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* 1.0.17rc1 10 10017 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 10210 12.so.0.10[.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.0.10[.0]
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* 1.2.12 13 10212 12.so.0.10[.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.0.10[.0]
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* 1.4.0beta15-33 14 10400 14.so.0.0[.0]
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*
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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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*
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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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*
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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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*
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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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*/
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/*
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* COPYRIGHT NOTICE, DISCLAIMER, and LICENSE:
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*
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* If you modify libpng you may insert additional notices immediately following
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* this sentence.
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*
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* libpng versions 1.2.6, August 15, 2004, through 1.4.0beta33, August 20, 2008, are
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* Copyright (c) 2004, 2006-2007 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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*
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* Cosmin Truta
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*
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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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*
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* Simon-Pierre Cadieux
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* Eric S. Raymond
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* Gilles Vollant
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*
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* and with the following additions to the disclaimer:
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*
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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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* the user.
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*
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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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*
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* Tom Lane
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* Glenn Randers-Pehrson
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* Willem van Schaik
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*
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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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*
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* John Bowler
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* Kevin Bracey
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* Sam Bushell
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* Magnus Holmgren
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* Greg Roelofs
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* Tom Tanner
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*
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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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*
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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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*
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* Andreas Dilger
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* Dave Martindale
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* Guy Eric Schalnat
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* Paul Schmidt
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* Tim Wegner
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*
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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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*
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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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*
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* 1. The origin of this source code must not be misrepresented.
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*
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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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*
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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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*
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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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* appreciated.
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*/
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/*
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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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*
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* printf("%s",png_get_copyright(NULL));
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*
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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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*/
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/*
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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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*/
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/*
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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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*
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* Thanks to Frank J. T. Wojcik for helping with the documentation.
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*/
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/*
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* Y2K compliance in libpng:
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* =========================
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*
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* July 1, 2008
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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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*
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* This is your unofficial assurance that libpng from version 0.71 and
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* upward through 1.4.0beta33 are Y2K compliant. It is my belief that earlier
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* versions were also Y2K compliant.
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*
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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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*
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* The integer is
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* "png_uint_16 year" in png_time_struct.
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*
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* The strings are
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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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*
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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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*
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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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*
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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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*
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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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*
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* Glenn Randers-Pehrson
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* libpng maintainer
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* PNG Development Group
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*/
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#ifndef PNG_H
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#define PNG_H
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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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*/
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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 "1.4.0beta33"
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#define PNG_HEADER_VERSION_STRING \
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" libpng version 1.4.0beta33 - August 20, 2008\n"
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#define PNG_LIBPNG_VER_SONUM 0
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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 0
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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 33
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/* Release Status */
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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 10400 /* 1.4.0 */
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#ifndef PNG_VERSION_INFO_ONLY
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/* include the compression library's header */
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#include "zlib.h"
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#endif
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#ifdef AIX
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#define jmpbuf __jmpbuf
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#endif
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/* include all user configurable info, including optional assembler routines */
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#include "pngconf.h"
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/*
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* Added at libpng-1.2.8 */
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/* Ref MSDN: Private as priority over Special
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* VS_FF_PRIVATEBUILD File *was not* built using standard release
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* procedures. If this value is given, the StringFileInfo block must
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* contain a PrivateBuild string.
|
|
*
|
|
* VS_FF_SPECIALBUILD File *was* built by the original company using
|
|
* standard release procedures but is a variation of the standard
|
|
* file of the same version number. If this value is given, the
|
|
* StringFileInfo block must contain a SpecialBuild string.
|
|
*/
|
|
|
|
#if defined(PNG_USER_PRIVATEBUILD)
|
|
# define PNG_LIBPNG_BUILD_TYPE \
|
|
(PNG_LIBPNG_BUILD_BASE_TYPE | PNG_LIBPNG_BUILD_PRIVATE)
|
|
#else
|
|
# if defined(PNG_LIBPNG_SPECIALBUILD)
|
|
# define PNG_LIBPNG_BUILD_TYPE \
|
|
(PNG_LIBPNG_BUILD_BASE_TYPE | PNG_LIBPNG_BUILD_SPECIAL)
|
|
# else
|
|
# define PNG_LIBPNG_BUILD_TYPE (PNG_LIBPNG_BUILD_BASE_TYPE)
|
|
# endif
|
|
#endif
|
|
|
|
#ifndef PNG_VERSION_INFO_ONLY
|
|
|
|
/* Inhibit C++ name-mangling for libpng functions but not for system calls. */
|
|
#ifdef __cplusplus
|
|
extern "C" {
|
|
#endif /* __cplusplus */
|
|
|
|
/* This file is arranged in several sections. The first section contains
|
|
* structure and type definitions. The second section contains the external
|
|
* library functions, while the third has the internal library functions,
|
|
* which applications aren't expected to use directly.
|
|
*/
|
|
|
|
/* variables declared in png.c - only it needs to define PNG_NO_EXTERN */
|
|
#if !defined(PNG_NO_EXTERN) || defined(PNG_ALWAYS_EXTERN)
|
|
/* Version information for C files, stored in png.c. This had better match
|
|
* the version above.
|
|
*/
|
|
#ifdef PNG_USE_GLOBAL_ARRAYS
|
|
PNG_EXPORT_VAR (const char) png_libpng_ver[18];
|
|
/* need room for 99.99.99beta99z */
|
|
#else
|
|
#define png_libpng_ver png_get_header_ver(NULL)
|
|
#endif
|
|
|
|
#ifdef PNG_USE_GLOBAL_ARRAYS
|
|
/* This was removed in version 1.0.5c */
|
|
/* Structures to facilitate easy interlacing. See png.c for more details */
|
|
PNG_EXPORT_VAR (const int FARDATA) png_pass_start[7];
|
|
PNG_EXPORT_VAR (const int FARDATA) png_pass_inc[7];
|
|
PNG_EXPORT_VAR (const int FARDATA) png_pass_ystart[7];
|
|
PNG_EXPORT_VAR (const int FARDATA) png_pass_yinc[7];
|
|
PNG_EXPORT_VAR (const int FARDATA) png_pass_mask[7];
|
|
PNG_EXPORT_VAR (const int FARDATA) png_pass_dsp_mask[7];
|
|
#ifdef PNG_USE_PNGGCCRD
|
|
PNG_EXPORT_VAR (const int FARDATA) png_pass_width[7];
|
|
#endif
|
|
/* This isn't currently used. If you need it, see png.c for more details.
|
|
PNG_EXPORT_VAR (const int FARDATA) png_pass_height[7];
|
|
*/
|
|
#endif
|
|
|
|
#endif /* PNG_NO_EXTERN */
|
|
|
|
/* Three color definitions. The order of the red, green, and blue, (and the
|
|
* exact size) is not important, although the size of the fields need to
|
|
* be png_byte or png_uint_16 (as defined below).
|
|
*/
|
|
typedef struct png_color_struct
|
|
{
|
|
png_byte red;
|
|
png_byte green;
|
|
png_byte blue;
|
|
} png_color;
|
|
typedef png_color FAR * png_colorp;
|
|
typedef png_color FAR * FAR * png_colorpp;
|
|
|
|
typedef struct png_color_16_struct
|
|
{
|
|
png_byte index; /* used for palette files */
|
|
png_uint_16 red; /* for use in red green blue files */
|
|
png_uint_16 green;
|
|
png_uint_16 blue;
|
|
png_uint_16 gray; /* for use in grayscale files */
|
|
} png_color_16;
|
|
typedef png_color_16 FAR * png_color_16p;
|
|
typedef png_color_16 FAR * FAR * png_color_16pp;
|
|
|
|
typedef struct png_color_8_struct
|
|
{
|
|
png_byte red; /* for use in red green blue files */
|
|
png_byte green;
|
|
png_byte blue;
|
|
png_byte gray; /* for use in grayscale files */
|
|
png_byte alpha; /* for alpha channel files */
|
|
} png_color_8;
|
|
typedef png_color_8 FAR * png_color_8p;
|
|
typedef png_color_8 FAR * FAR * png_color_8pp;
|
|
|
|
/*
|
|
* The following two structures are used for the in-core representation
|
|
* of sPLT chunks.
|
|
*/
|
|
typedef struct png_sPLT_entry_struct
|
|
{
|
|
png_uint_16 red;
|
|
png_uint_16 green;
|
|
png_uint_16 blue;
|
|
png_uint_16 alpha;
|
|
png_uint_16 frequency;
|
|
} png_sPLT_entry;
|
|
typedef png_sPLT_entry FAR * png_sPLT_entryp;
|
|
typedef png_sPLT_entry FAR * FAR * png_sPLT_entrypp;
|
|
|
|
/* When the depth of the sPLT palette is 8 bits, the color and alpha samples
|
|
* occupy the LSB of their respective members, and the MSB of each member
|
|
* is zero-filled. The frequency member always occupies the full 16 bits.
|
|
*/
|
|
|
|
typedef struct png_sPLT_struct
|
|
{
|
|
png_charp name; /* palette name */
|
|
png_byte depth; /* depth of palette samples */
|
|
png_sPLT_entryp entries; /* palette entries */
|
|
png_int_32 nentries; /* number of palette entries */
|
|
} png_sPLT_t;
|
|
typedef png_sPLT_t FAR * png_sPLT_tp;
|
|
typedef png_sPLT_t FAR * FAR * png_sPLT_tpp;
|
|
|
|
#ifdef PNG_TEXT_SUPPORTED
|
|
/* png_text holds the contents of a text/ztxt/itxt chunk in a PNG file,
|
|
* and whether that contents is compressed or not. The "key" field
|
|
* points to a regular zero-terminated C string. The "text", "lang", and
|
|
* "lang_key" fields can be regular C strings, empty strings, or NULL pointers.
|
|
* However, the * structure returned by png_get_text() will always contain
|
|
* regular zero-terminated C strings (possibly empty), never NULL pointers,
|
|
* so they can be safely used in printf() and other string-handling functions.
|
|
*/
|
|
typedef struct png_text_struct
|
|
{
|
|
int compression; /* compression value:
|
|
-1: tEXt, none
|
|
0: zTXt, deflate
|
|
1: iTXt, none
|
|
2: iTXt, deflate */
|
|
png_charp key; /* keyword, 1-79 character description of "text" */
|
|
png_charp text; /* comment, may be an empty string (ie "")
|
|
or a NULL pointer */
|
|
png_size_t text_length; /* length of the text string */
|
|
#ifdef PNG_iTXt_SUPPORTED
|
|
png_size_t itxt_length; /* length of the itxt string */
|
|
png_charp lang; /* language code, 0-79 characters
|
|
or a NULL pointer */
|
|
png_charp lang_key; /* keyword translated UTF-8 string, 0 or more
|
|
chars or a NULL pointer */
|
|
#endif
|
|
} png_text;
|
|
typedef png_text FAR * png_textp;
|
|
typedef png_text FAR * FAR * png_textpp;
|
|
#endif
|
|
|
|
/* Supported compression types for text in PNG files (tEXt, and zTXt).
|
|
* The values of the PNG_TEXT_COMPRESSION_ defines should NOT be changed. */
|
|
#define PNG_TEXT_COMPRESSION_NONE_WR -3
|
|
#define PNG_TEXT_COMPRESSION_zTXt_WR -2
|
|
#define PNG_TEXT_COMPRESSION_NONE -1
|
|
#define PNG_TEXT_COMPRESSION_zTXt 0
|
|
#define PNG_ITXT_COMPRESSION_NONE 1
|
|
#define PNG_ITXT_COMPRESSION_zTXt 2
|
|
#define PNG_TEXT_COMPRESSION_LAST 3 /* Not a valid value */
|
|
|
|
/* png_time is a way to hold the time in an machine independent way.
|
|
* Two conversions are provided, both from time_t and struct tm. There
|
|
* is no portable way to convert to either of these structures, as far
|
|
* as I know. If you know of a portable way, send it to me. As a side
|
|
* note - PNG has always been Year 2000 compliant!
|
|
*/
|
|
typedef struct png_time_struct
|
|
{
|
|
png_uint_16 year; /* full year, as in, 1995 */
|
|
png_byte month; /* month of year, 1 - 12 */
|
|
png_byte day; /* day of month, 1 - 31 */
|
|
png_byte hour; /* hour of day, 0 - 23 */
|
|
png_byte minute; /* minute of hour, 0 - 59 */
|
|
png_byte second; /* second of minute, 0 - 60 (for leap seconds) */
|
|
} png_time;
|
|
typedef png_time FAR * png_timep;
|
|
typedef png_time FAR * FAR * png_timepp;
|
|
|
|
#if defined(PNG_UNKNOWN_CHUNKS_SUPPORTED)
|
|
/* png_unknown_chunk is a structure to hold queued chunks for which there is
|
|
* no specific support. The idea is that we can use this to queue
|
|
* up private chunks for output even though the library doesn't actually
|
|
* know about their semantics.
|
|
*/
|
|
typedef struct png_unknown_chunk_t
|
|
{
|
|
png_byte name[5];
|
|
png_byte *data;
|
|
png_size_t size;
|
|
|
|
/* libpng-using applications should NOT directly modify this byte. */
|
|
png_byte location; /* mode of operation at read time */
|
|
}
|
|
png_unknown_chunk;
|
|
typedef png_unknown_chunk FAR * png_unknown_chunkp;
|
|
typedef png_unknown_chunk FAR * FAR * png_unknown_chunkpp;
|
|
#endif
|
|
|
|
/* png_info is a structure that holds the information in a PNG file so
|
|
* that the application can find out the characteristics of the image.
|
|
* If you are reading the file, this structure will tell you what is
|
|
* in the PNG file. If you are writing the file, fill in the information
|
|
* you want to put into the PNG file, then call png_write_info().
|
|
* The names chosen should be very close to the PNG specification, so
|
|
* consult that document for information about the meaning of each field.
|
|
*
|
|
* With libpng < 0.95, it was only possible to directly set and read the
|
|
* the values in the png_info_struct, which meant that the contents and
|
|
* order of the values had to remain fixed. With libpng 0.95 and later,
|
|
* however, there are now functions that abstract the contents of
|
|
* png_info_struct from the application, so this makes it easier to use
|
|
* libpng with dynamic libraries, and even makes it possible to use
|
|
* libraries that don't have all of the libpng ancillary chunk-handing
|
|
* functionality.
|
|
*
|
|
* In any case, the order of the parameters in png_info_struct should NOT
|
|
* be changed for as long as possible to keep compatibility with applications
|
|
* that use the old direct-access method with png_info_struct.
|
|
*
|
|
* The following members may have allocated storage attached that should be
|
|
* cleaned up before the structure is discarded: palette, trans, text,
|
|
* pcal_purpose, pcal_units, pcal_params, hist, iccp_name, iccp_profile,
|
|
* splt_palettes, scal_unit, row_pointers, and unknowns. By default, these
|
|
* are automatically freed when the info structure is deallocated, if they were
|
|
* allocated internally by libpng. This behavior can be changed by means
|
|
* of the png_data_freer() function.
|
|
*
|
|
* More allocation details: all the chunk-reading functions that
|
|
* change these members go through the corresponding png_set_*
|
|
* functions. A function to clear these members is available: see
|
|
* png_free_data(). The png_set_* functions do not depend on being
|
|
* able to point info structure members to any of the storage they are
|
|
* passed (they make their own copies), EXCEPT that the png_set_text
|
|
* functions use the same storage passed to them in the text_ptr or
|
|
* itxt_ptr structure argument, and the png_set_rows and png_set_unknowns
|
|
* functions do not make their own copies.
|
|
*/
|
|
typedef struct png_info_struct
|
|
{
|
|
/* the following are necessary for every PNG file */
|
|
png_uint_32 width; /* width of image in pixels (from IHDR) */
|
|
png_uint_32 height; /* height of image in pixels (from IHDR) */
|
|
png_uint_32 valid; /* valid chunk data (see PNG_INFO_ below) */
|
|
png_size_t rowbytes; /* bytes needed to hold an untransformed row */
|
|
png_colorp palette; /* array of color values (valid & PNG_INFO_PLTE) */
|
|
png_uint_16 num_palette; /* number of color entries in "palette" (PLTE) */
|
|
png_uint_16 num_trans; /* number of transparent palette color (tRNS) */
|
|
png_byte bit_depth; /* 1, 2, 4, 8, or 16 bits/channel (from IHDR) */
|
|
png_byte color_type; /* see PNG_COLOR_TYPE_ below (from IHDR) */
|
|
/* The following three should have been named *_method not *_type */
|
|
png_byte compression_type; /* must be PNG_COMPRESSION_TYPE_BASE (IHDR) */
|
|
png_byte filter_type; /* must be PNG_FILTER_TYPE_BASE (from IHDR) */
|
|
png_byte interlace_type; /* One of PNG_INTERLACE_NONE, PNG_INTERLACE_ADAM7 */
|
|
|
|
/* The following is informational only on read, and not used on writes. */
|
|
png_byte channels; /* number of data channels per pixel (1, 2, 3, 4) */
|
|
png_byte pixel_depth; /* number of bits per pixel */
|
|
png_byte spare_byte; /* to align the data, and for future use */
|
|
png_byte signature[8]; /* magic bytes read by libpng from start of file */
|
|
|
|
/* The rest of the data is optional. If you are reading, check the
|
|
* valid field to see if the information in these are valid. If you
|
|
* are writing, set the valid field to those chunks you want written,
|
|
* and initialize the appropriate fields below.
|
|
*/
|
|
|
|
#if defined(PNG_gAMA_SUPPORTED) && defined(PNG_FLOATING_POINT_SUPPORTED)
|
|
/* The gAMA chunk describes the gamma characteristics of the system
|
|
* on which the image was created, normally in the range [1.0, 2.5].
|
|
* Data is valid if (valid & PNG_INFO_gAMA) is non-zero.
|
|
*/
|
|
float gamma; /* gamma value of image, if (valid & PNG_INFO_gAMA) */
|
|
#endif
|
|
|
|
#if defined(PNG_sRGB_SUPPORTED)
|
|
/* GR-P, 0.96a */
|
|
/* Data valid if (valid & PNG_INFO_sRGB) non-zero. */
|
|
png_byte srgb_intent; /* sRGB rendering intent [0, 1, 2, or 3] */
|
|
#endif
|
|
|
|
#if defined(PNG_TEXT_SUPPORTED)
|
|
/* The tEXt, and zTXt chunks contain human-readable textual data in
|
|
* uncompressed, compressed, and optionally compressed forms, respectively.
|
|
* The data in "text" is an array of pointers to uncompressed,
|
|
* null-terminated C strings. Each chunk has a keyword that describes the
|
|
* textual data contained in that chunk. Keywords are not required to be
|
|
* unique, and the text string may be empty. Any number of text chunks may
|
|
* be in an image.
|
|
*/
|
|
int num_text; /* number of comments read/to write */
|
|
int max_text; /* current size of text array */
|
|
png_textp text; /* array of comments read/to write */
|
|
#endif /* PNG_TEXT_SUPPORTED */
|
|
|
|
#if defined(PNG_tIME_SUPPORTED)
|
|
/* The tIME chunk holds the last time the displayed image data was
|
|
* modified. See the png_time struct for the contents of this struct.
|
|
*/
|
|
png_time mod_time;
|
|
#endif
|
|
|
|
#if defined(PNG_sBIT_SUPPORTED)
|
|
/* The sBIT chunk specifies the number of significant high-order bits
|
|
* in the pixel data. Values are in the range [1, bit_depth], and are
|
|
* only specified for the channels in the pixel data. The contents of
|
|
* the low-order bits is not specified. Data is valid if
|
|
* (valid & PNG_INFO_sBIT) is non-zero.
|
|
*/
|
|
png_color_8 sig_bit; /* significant bits in color channels */
|
|
#endif
|
|
|
|
#if defined(PNG_tRNS_SUPPORTED) || defined(PNG_READ_EXPAND_SUPPORTED) || \
|
|
defined(PNG_READ_BACKGROUND_SUPPORTED)
|
|
/* The tRNS chunk supplies transparency data for paletted images and
|
|
* other image types that don't need a full alpha channel. There are
|
|
* "num_trans" transparency values for a paletted image, stored in the
|
|
* same order as the palette colors, starting from index 0. Values
|
|
* for the data are in the range [0, 255], ranging from fully transparent
|
|
* to fully opaque, respectively. For non-paletted images, there is a
|
|
* single color specified that should be treated as fully transparent.
|
|
* Data is valid if (valid & PNG_INFO_tRNS) is non-zero.
|
|
*/
|
|
png_bytep trans; /* transparent values for paletted image */
|
|
png_color_16 trans_values; /* transparent color for non-palette image */
|
|
#endif
|
|
|
|
#if defined(PNG_bKGD_SUPPORTED) || defined(PNG_READ_BACKGROUND_SUPPORTED)
|
|
/* The bKGD chunk gives the suggested image background color if the
|
|
* display program does not have its own background color and the image
|
|
* is needs to composited onto a background before display. The colors
|
|
* in "background" are normally in the same color space/depth as the
|
|
* pixel data. Data is valid if (valid & PNG_INFO_bKGD) is non-zero.
|
|
*/
|
|
png_color_16 background;
|
|
#endif
|
|
|
|
#if defined(PNG_oFFs_SUPPORTED)
|
|
/* The oFFs chunk gives the offset in "offset_unit_type" units rightwards
|
|
* and downwards from the top-left corner of the display, page, or other
|
|
* application-specific co-ordinate space. See the PNG_OFFSET_ defines
|
|
* below for the unit types. Valid if (valid & PNG_INFO_oFFs) non-zero.
|
|
*/
|
|
png_int_32 x_offset; /* x offset on page */
|
|
png_int_32 y_offset; /* y offset on page */
|
|
png_byte offset_unit_type; /* offset units type */
|
|
#endif
|
|
|
|
#if defined(PNG_pHYs_SUPPORTED)
|
|
/* The pHYs chunk gives the physical pixel density of the image for
|
|
* display or printing in "phys_unit_type" units (see PNG_RESOLUTION_
|
|
* defines below). Data is valid if (valid & PNG_INFO_pHYs) is non-zero.
|
|
*/
|
|
png_uint_32 x_pixels_per_unit; /* horizontal pixel density */
|
|
png_uint_32 y_pixels_per_unit; /* vertical pixel density */
|
|
png_byte phys_unit_type; /* resolution type (see PNG_RESOLUTION_ below) */
|
|
#endif
|
|
|
|
#if defined(PNG_hIST_SUPPORTED)
|
|
/* The hIST chunk contains the relative frequency or importance of the
|
|
* various palette entries, so that a viewer can intelligently select a
|
|
* reduced-color palette, if required. Data is an array of "num_palette"
|
|
* values in the range [0,65535]. Data valid if (valid & PNG_INFO_hIST)
|
|
* is non-zero.
|
|
*/
|
|
png_uint_16p hist;
|
|
#endif
|
|
|
|
#ifdef PNG_cHRM_SUPPORTED
|
|
/* The cHRM chunk describes the CIE color characteristics of the monitor
|
|
* on which the PNG was created. This data allows the viewer to do gamut
|
|
* mapping of the input image to ensure that the viewer sees the same
|
|
* colors in the image as the creator. Values are in the range
|
|
* [0.0, 0.8]. Data valid if (valid & PNG_INFO_cHRM) non-zero.
|
|
*/
|
|
#ifdef PNG_FLOATING_POINT_SUPPORTED
|
|
float x_white;
|
|
float y_white;
|
|
float x_red;
|
|
float y_red;
|
|
float x_green;
|
|
float y_green;
|
|
float x_blue;
|
|
float y_blue;
|
|
#endif
|
|
#endif
|
|
|
|
#if defined(PNG_pCAL_SUPPORTED)
|
|
/* The pCAL chunk describes a transformation between the stored pixel
|
|
* values and original physical data values used to create the image.
|
|
* The integer range [0, 2^bit_depth - 1] maps to the floating-point
|
|
* range given by [pcal_X0, pcal_X1], and are further transformed by a
|
|
* (possibly non-linear) transformation function given by "pcal_type"
|
|
* and "pcal_params" into "pcal_units". Please see the PNG_EQUATION_
|
|
* defines below, and the PNG-Group's PNG extensions document for a
|
|
* complete description of the transformations and how they should be
|
|
* implemented, and for a description of the ASCII parameter strings.
|
|
* Data values are valid if (valid & PNG_INFO_pCAL) non-zero.
|
|
*/
|
|
png_charp pcal_purpose; /* pCAL chunk description string */
|
|
png_int_32 pcal_X0; /* minimum value */
|
|
png_int_32 pcal_X1; /* maximum value */
|
|
png_charp pcal_units; /* Latin-1 string giving physical units */
|
|
png_charpp pcal_params; /* ASCII strings containing parameter values */
|
|
png_byte pcal_type; /* equation type (see PNG_EQUATION_ below) */
|
|
png_byte pcal_nparams; /* number of parameters given in pcal_params */
|
|
#endif
|
|
|
|
/* New members added in libpng-1.0.6 */
|
|
#ifdef PNG_FREE_ME_SUPPORTED
|
|
png_uint_32 free_me; /* flags items libpng is responsible for freeing */
|
|
#endif
|
|
|
|
#if defined(PNG_UNKNOWN_CHUNKS_SUPPORTED)
|
|
/* storage for unknown chunks that the library doesn't recognize. */
|
|
png_unknown_chunkp unknown_chunks;
|
|
png_size_t unknown_chunks_num;
|
|
#endif
|
|
|
|
#if defined(PNG_iCCP_SUPPORTED)
|
|
/* iCCP chunk data. */
|
|
png_charp iccp_name; /* profile name */
|
|
png_charp iccp_profile; /* International Color Consortium profile data */
|
|
/* Note to maintainer: should be png_bytep */
|
|
png_uint_32 iccp_proflen; /* ICC profile data length */
|
|
png_byte iccp_compression; /* Always zero */
|
|
#endif
|
|
|
|
#if defined(PNG_sPLT_SUPPORTED)
|
|
/* data on sPLT chunks (there may be more than one). */
|
|
png_sPLT_tp splt_palettes;
|
|
png_uint_32 splt_palettes_num;
|
|
#endif
|
|
|
|
#if defined(PNG_sCAL_SUPPORTED)
|
|
/* The sCAL chunk describes the actual physical dimensions of the
|
|
* subject matter of the graphic. The chunk contains a unit specification
|
|
* a byte value, and two ASCII strings representing floating-point
|
|
* values. The values are width and height corresponsing to one pixel
|
|
* in the image. This external representation is converted to double
|
|
* here. Data values are valid if (valid & PNG_INFO_sCAL) is non-zero.
|
|
*/
|
|
png_byte scal_unit; /* unit of physical scale */
|
|
#ifdef PNG_FLOATING_POINT_SUPPORTED
|
|
double scal_pixel_width; /* width of one pixel */
|
|
double scal_pixel_height; /* height of one pixel */
|
|
#endif
|
|
#ifdef PNG_FIXED_POINT_SUPPORTED
|
|
png_charp scal_s_width; /* string containing height */
|
|
png_charp scal_s_height; /* string containing width */
|
|
#endif
|
|
#endif
|
|
|
|
#if defined(PNG_INFO_IMAGE_SUPPORTED)
|
|
/* Memory has been allocated if (valid & PNG_ALLOCATED_INFO_ROWS) non-zero */
|
|
/* Data valid if (valid & PNG_INFO_IDAT) non-zero */
|
|
png_bytepp row_pointers; /* the image bits */
|
|
#endif
|
|
|
|
#if defined(PNG_FIXED_POINT_SUPPORTED) && defined(PNG_gAMA_SUPPORTED)
|
|
png_fixed_point int_gamma; /* gamma of image, if (valid & PNG_INFO_gAMA) */
|
|
#endif
|
|
|
|
#if defined(PNG_cHRM_SUPPORTED) && defined(PNG_FIXED_POINT_SUPPORTED)
|
|
png_fixed_point int_x_white;
|
|
png_fixed_point int_y_white;
|
|
png_fixed_point int_x_red;
|
|
png_fixed_point int_y_red;
|
|
png_fixed_point int_x_green;
|
|
png_fixed_point int_y_green;
|
|
png_fixed_point int_x_blue;
|
|
png_fixed_point int_y_blue;
|
|
#endif
|
|
|
|
} png_info;
|
|
|
|
typedef png_info FAR * png_infop;
|
|
typedef png_info FAR * FAR * png_infopp;
|
|
|
|
/* Maximum positive integer used in PNG is (2^31)-1 */
|
|
#define PNG_UINT_31_MAX ((png_uint_32)0x7fffffffL)
|
|
#define PNG_UINT_32_MAX ((png_uint_32)(-1))
|
|
#define PNG_SIZE_MAX ((png_size_t)(-1))
|
|
|
|
/* These describe the color_type field in png_info. */
|
|
/* color type masks */
|
|
#define PNG_COLOR_MASK_PALETTE 1
|
|
#define PNG_COLOR_MASK_COLOR 2
|
|
#define PNG_COLOR_MASK_ALPHA 4
|
|
|
|
/* color types. Note that not all combinations are legal */
|
|
#define PNG_COLOR_TYPE_GRAY 0
|
|
#define PNG_COLOR_TYPE_PALETTE (PNG_COLOR_MASK_COLOR | PNG_COLOR_MASK_PALETTE)
|
|
#define PNG_COLOR_TYPE_RGB (PNG_COLOR_MASK_COLOR)
|
|
#define PNG_COLOR_TYPE_RGB_ALPHA (PNG_COLOR_MASK_COLOR | PNG_COLOR_MASK_ALPHA)
|
|
#define PNG_COLOR_TYPE_GRAY_ALPHA (PNG_COLOR_MASK_ALPHA)
|
|
/* aliases */
|
|
#define PNG_COLOR_TYPE_RGBA PNG_COLOR_TYPE_RGB_ALPHA
|
|
#define PNG_COLOR_TYPE_GA PNG_COLOR_TYPE_GRAY_ALPHA
|
|
|
|
/* This is for compression type. PNG 1.0-1.2 only define the single type. */
|
|
#define PNG_COMPRESSION_TYPE_BASE 0 /* Deflate method 8, 32K window */
|
|
#define PNG_COMPRESSION_TYPE_DEFAULT PNG_COMPRESSION_TYPE_BASE
|
|
|
|
/* This is for filter type. PNG 1.0-1.2 only define the single type. */
|
|
#define PNG_FILTER_TYPE_BASE 0 /* Single row per-byte filtering */
|
|
#define PNG_INTRAPIXEL_DIFFERENCING 64 /* Used only in MNG datastreams */
|
|
#define PNG_FILTER_TYPE_DEFAULT PNG_FILTER_TYPE_BASE
|
|
|
|
/* These are for the interlacing type. These values should NOT be changed. */
|
|
#define PNG_INTERLACE_NONE 0 /* Non-interlaced image */
|
|
#define PNG_INTERLACE_ADAM7 1 /* Adam7 interlacing */
|
|
#define PNG_INTERLACE_LAST 2 /* Not a valid value */
|
|
|
|
/* These are for the oFFs chunk. These values should NOT be changed. */
|
|
#define PNG_OFFSET_PIXEL 0 /* Offset in pixels */
|
|
#define PNG_OFFSET_MICROMETER 1 /* Offset in micrometers (1/10^6 meter) */
|
|
#define PNG_OFFSET_LAST 2 /* Not a valid value */
|
|
|
|
/* These are for the pCAL chunk. These values should NOT be changed. */
|
|
#define PNG_EQUATION_LINEAR 0 /* Linear transformation */
|
|
#define PNG_EQUATION_BASE_E 1 /* Exponential base e transform */
|
|
#define PNG_EQUATION_ARBITRARY 2 /* Arbitrary base exponential transform */
|
|
#define PNG_EQUATION_HYPERBOLIC 3 /* Hyperbolic sine transformation */
|
|
#define PNG_EQUATION_LAST 4 /* Not a valid value */
|
|
|
|
/* These are for the sCAL chunk. These values should NOT be changed. */
|
|
#define PNG_SCALE_UNKNOWN 0 /* unknown unit (image scale) */
|
|
#define PNG_SCALE_METER 1 /* meters per pixel */
|
|
#define PNG_SCALE_RADIAN 2 /* radians per pixel */
|
|
#define PNG_SCALE_LAST 3 /* Not a valid value */
|
|
|
|
/* These are for the pHYs chunk. These values should NOT be changed. */
|
|
#define PNG_RESOLUTION_UNKNOWN 0 /* pixels/unknown unit (aspect ratio) */
|
|
#define PNG_RESOLUTION_METER 1 /* pixels/meter */
|
|
#define PNG_RESOLUTION_LAST 2 /* Not a valid value */
|
|
|
|
/* These are for the sRGB chunk. These values should NOT be changed. */
|
|
#define PNG_sRGB_INTENT_PERCEPTUAL 0
|
|
#define PNG_sRGB_INTENT_RELATIVE 1
|
|
#define PNG_sRGB_INTENT_SATURATION 2
|
|
#define PNG_sRGB_INTENT_ABSOLUTE 3
|
|
#define PNG_sRGB_INTENT_LAST 4 /* Not a valid value */
|
|
|
|
/* This is for text chunks */
|
|
#define PNG_KEYWORD_MAX_LENGTH 79
|
|
|
|
/* Maximum number of entries in PLTE/sPLT/tRNS arrays */
|
|
#define PNG_MAX_PALETTE_LENGTH 256
|
|
|
|
/* These determine if an ancillary chunk's data has been successfully read
|
|
* from the PNG header, or if the application has filled in the corresponding
|
|
* data in the info_struct to be written into the output file. The values
|
|
* of the PNG_INFO_<chunk> defines should NOT be changed.
|
|
*/
|
|
#define PNG_INFO_gAMA 0x0001
|
|
#define PNG_INFO_sBIT 0x0002
|
|
#define PNG_INFO_cHRM 0x0004
|
|
#define PNG_INFO_PLTE 0x0008
|
|
#define PNG_INFO_tRNS 0x0010
|
|
#define PNG_INFO_bKGD 0x0020
|
|
#define PNG_INFO_hIST 0x0040
|
|
#define PNG_INFO_pHYs 0x0080
|
|
#define PNG_INFO_oFFs 0x0100
|
|
#define PNG_INFO_tIME 0x0200
|
|
#define PNG_INFO_pCAL 0x0400
|
|
#define PNG_INFO_sRGB 0x0800 /* GR-P, 0.96a */
|
|
#define PNG_INFO_iCCP 0x1000 /* ESR, 1.0.6 */
|
|
#define PNG_INFO_sPLT 0x2000 /* ESR, 1.0.6 */
|
|
#define PNG_INFO_sCAL 0x4000 /* ESR, 1.0.6 */
|
|
#define PNG_INFO_IDAT 0x8000L /* ESR, 1.0.6 */
|
|
|
|
/* This is used for the transformation routines, as some of them
|
|
* change these values for the row. It also should enable using
|
|
* the routines for other purposes.
|
|
*/
|
|
typedef struct png_row_info_struct
|
|
{
|
|
png_uint_32 width; /* width of row */
|
|
png_size_t rowbytes; /* number of bytes in row */
|
|
png_byte color_type; /* color type of row */
|
|
png_byte bit_depth; /* bit depth of row */
|
|
png_byte channels; /* number of channels (1, 2, 3, or 4) */
|
|
png_byte pixel_depth; /* bits per pixel (depth * channels) */
|
|
} png_row_info;
|
|
|
|
typedef png_row_info FAR * png_row_infop;
|
|
typedef png_row_info FAR * FAR * png_row_infopp;
|
|
|
|
/* These are the function types for the I/O functions and for the functions
|
|
* that allow the user to override the default I/O functions with his or her
|
|
* own. The png_error_ptr type should match that of user-supplied warning
|
|
* and error functions, while the png_rw_ptr type should match that of the
|
|
* user read/write data functions.
|
|
*/
|
|
typedef struct png_struct_def png_struct;
|
|
typedef png_struct FAR * png_structp;
|
|
|
|
typedef void (PNGAPI *png_error_ptr) PNGARG((png_structp, png_const_charp));
|
|
typedef void (PNGAPI *png_rw_ptr) PNGARG((png_structp, png_bytep, png_size_t));
|
|
typedef void (PNGAPI *png_flush_ptr) PNGARG((png_structp));
|
|
typedef void (PNGAPI *png_read_status_ptr) PNGARG((png_structp, png_uint_32,
|
|
int));
|
|
typedef void (PNGAPI *png_write_status_ptr) PNGARG((png_structp, png_uint_32,
|
|
int));
|
|
|
|
#ifdef PNG_PROGRESSIVE_READ_SUPPORTED
|
|
typedef void (PNGAPI *png_progressive_info_ptr) PNGARG((png_structp, png_infop));
|
|
typedef void (PNGAPI *png_progressive_end_ptr) PNGARG((png_structp, png_infop));
|
|
typedef void (PNGAPI *png_progressive_row_ptr) PNGARG((png_structp, png_bytep,
|
|
png_uint_32, int));
|
|
#endif
|
|
|
|
#if defined(PNG_READ_USER_TRANSFORM_SUPPORTED) || \
|
|
defined(PNG_WRITE_USER_TRANSFORM_SUPPORTED) || \
|
|
defined(PNG_LEGACY_SUPPORTED)
|
|
typedef void (PNGAPI *png_user_transform_ptr) PNGARG((png_structp,
|
|
png_row_infop, png_bytep));
|
|
#endif
|
|
|
|
#if defined(PNG_USER_CHUNKS_SUPPORTED)
|
|
typedef int (PNGAPI *png_user_chunk_ptr) PNGARG((png_structp, png_unknown_chunkp));
|
|
#endif
|
|
#if defined(PNG_UNKNOWN_CHUNKS_SUPPORTED)
|
|
typedef void (PNGAPI *png_unknown_chunk_ptr) PNGARG((png_structp));
|
|
#endif
|
|
|
|
/* Transform masks for the high-level interface */
|
|
#define PNG_TRANSFORM_IDENTITY 0x0000 /* read and write */
|
|
#define PNG_TRANSFORM_STRIP_16 0x0001 /* read only */
|
|
#define PNG_TRANSFORM_STRIP_ALPHA 0x0002 /* read only */
|
|
#define PNG_TRANSFORM_PACKING 0x0004 /* read and write */
|
|
#define PNG_TRANSFORM_PACKSWAP 0x0008 /* read and write */
|
|
#define PNG_TRANSFORM_EXPAND 0x0010 /* read only */
|
|
#define PNG_TRANSFORM_INVERT_MONO 0x0020 /* read and write */
|
|
#define PNG_TRANSFORM_SHIFT 0x0040 /* read and write */
|
|
#define PNG_TRANSFORM_BGR 0x0080 /* read and write */
|
|
#define PNG_TRANSFORM_SWAP_ALPHA 0x0100 /* read and write */
|
|
#define PNG_TRANSFORM_SWAP_ENDIAN 0x0200 /* read and write */
|
|
#define PNG_TRANSFORM_INVERT_ALPHA 0x0400 /* read and write */
|
|
#define PNG_TRANSFORM_STRIP_FILLER 0x0800 /* WRITE only */
|
|
|
|
/* Flags for MNG supported features */
|
|
#define PNG_FLAG_MNG_EMPTY_PLTE 0x01
|
|
#define PNG_FLAG_MNG_FILTER_64 0x04
|
|
#define PNG_ALL_MNG_FEATURES 0x05
|
|
|
|
typedef png_voidp (*png_malloc_ptr) PNGARG((png_structp, png_alloc_size_t));
|
|
typedef void (*png_free_ptr) PNGARG((png_structp, png_voidp));
|
|
|
|
/* The structure that holds the information to read and write PNG files.
|
|
* The only people who need to care about what is inside of this are the
|
|
* people who will be modifying the library for their own special needs.
|
|
* It should NOT be accessed directly by an application, except to store
|
|
* the jmp_buf.
|
|
*/
|
|
|
|
struct png_struct_def
|
|
{
|
|
#ifdef PNG_SETJMP_SUPPORTED
|
|
jmp_buf jmpbuf; /* used in png_error */
|
|
#endif
|
|
png_error_ptr error_fn; /* function for printing errors and aborting */
|
|
png_error_ptr warning_fn; /* function for printing warnings */
|
|
png_voidp error_ptr; /* user supplied struct for error functions */
|
|
png_rw_ptr write_data_fn; /* function for writing output data */
|
|
png_rw_ptr read_data_fn; /* function for reading input data */
|
|
png_voidp io_ptr; /* ptr to application struct for I/O functions */
|
|
|
|
#if defined(PNG_READ_USER_TRANSFORM_SUPPORTED)
|
|
png_user_transform_ptr read_user_transform_fn; /* user read transform */
|
|
#endif
|
|
|
|
#if defined(PNG_WRITE_USER_TRANSFORM_SUPPORTED)
|
|
png_user_transform_ptr write_user_transform_fn; /* user write transform */
|
|
#endif
|
|
|
|
/* These were added in libpng-1.0.2 */
|
|
#if defined(PNG_USER_TRANSFORM_PTR_SUPPORTED)
|
|
#if defined(PNG_READ_USER_TRANSFORM_SUPPORTED) || \
|
|
defined(PNG_WRITE_USER_TRANSFORM_SUPPORTED)
|
|
png_voidp user_transform_ptr; /* user supplied struct for user transform */
|
|
png_byte user_transform_depth; /* bit depth of user transformed pixels */
|
|
png_byte user_transform_channels; /* channels in user transformed pixels */
|
|
#endif
|
|
#endif
|
|
|
|
png_uint_32 mode; /* tells us where we are in the PNG file */
|
|
png_uint_32 flags; /* flags indicating various things to libpng */
|
|
png_uint_32 transformations; /* which transformations to perform */
|
|
|
|
z_stream zstream; /* pointer to decompression structure (below) */
|
|
png_bytep zbuf; /* buffer for zlib */
|
|
png_size_t zbuf_size; /* size of zbuf */
|
|
int zlib_level; /* holds zlib compression level */
|
|
int zlib_method; /* holds zlib compression method */
|
|
int zlib_window_bits; /* holds zlib compression window bits */
|
|
int zlib_mem_level; /* holds zlib compression memory level */
|
|
int zlib_strategy; /* holds zlib compression strategy */
|
|
|
|
png_uint_32 width; /* width of image in pixels */
|
|
png_uint_32 height; /* height of image in pixels */
|
|
png_uint_32 num_rows; /* number of rows in current pass */
|
|
png_uint_32 usr_width; /* width of row at start of write */
|
|
png_size_t rowbytes; /* size of row in bytes */
|
|
png_size_t irowbytes; /* size of current interlaced row in bytes */
|
|
png_uint_32 iwidth; /* width of current interlaced row in pixels */
|
|
png_uint_32 row_number; /* current row in interlace pass */
|
|
png_bytep prev_row; /* buffer to save previous (unfiltered) row */
|
|
png_bytep row_buf; /* buffer to save current (unfiltered) row */
|
|
png_bytep sub_row; /* buffer to save "sub" row when filtering */
|
|
png_bytep up_row; /* buffer to save "up" row when filtering */
|
|
png_bytep avg_row; /* buffer to save "avg" row when filtering */
|
|
png_bytep paeth_row; /* buffer to save "Paeth" row when filtering */
|
|
png_row_info row_info; /* used for transformation routines */
|
|
|
|
png_uint_32 idat_size; /* current IDAT size for read */
|
|
png_uint_32 crc; /* current chunk CRC value */
|
|
png_colorp palette; /* palette from the input file */
|
|
png_uint_16 num_palette; /* number of color entries in palette */
|
|
png_uint_16 num_trans; /* number of transparency values */
|
|
png_byte chunk_name[5]; /* null-terminated name of current chunk */
|
|
png_byte compression; /* file compression type (always 0) */
|
|
png_byte filter; /* file filter type (always 0) */
|
|
png_byte interlaced; /* PNG_INTERLACE_NONE, PNG_INTERLACE_ADAM7 */
|
|
png_byte pass; /* current interlace pass (0 - 6) */
|
|
png_byte do_filter; /* row filter flags (see PNG_FILTER_ below ) */
|
|
png_byte color_type; /* color type of file */
|
|
png_byte bit_depth; /* bit depth of file */
|
|
png_byte usr_bit_depth; /* bit depth of users row */
|
|
png_byte pixel_depth; /* number of bits per pixel */
|
|
png_byte channels; /* number of channels in file */
|
|
png_byte usr_channels; /* channels at start of write */
|
|
png_byte sig_bytes; /* magic bytes read/written from start of file */
|
|
|
|
#if defined(PNG_READ_FILLER_SUPPORTED) || defined(PNG_WRITE_FILLER_SUPPORTED)
|
|
#ifdef PNG_LEGACY_SUPPORTED
|
|
png_byte filler; /* filler byte for pixel expansion */
|
|
#else
|
|
png_uint_16 filler; /* filler bytes for pixel expansion */
|
|
#endif
|
|
#endif
|
|
|
|
#if defined(PNG_bKGD_SUPPORTED)
|
|
png_byte background_gamma_type;
|
|
# ifdef PNG_FLOATING_POINT_SUPPORTED
|
|
float background_gamma;
|
|
# endif
|
|
png_color_16 background; /* background color in screen gamma space */
|
|
#if defined(PNG_READ_GAMMA_SUPPORTED)
|
|
png_color_16 background_1; /* background normalized to gamma 1.0 */
|
|
#endif
|
|
#endif /* PNG_bKGD_SUPPORTED */
|
|
|
|
#if defined(PNG_WRITE_FLUSH_SUPPORTED)
|
|
png_flush_ptr output_flush_fn;/* Function for flushing output */
|
|
png_uint_32 flush_dist; /* how many rows apart to flush, 0 - no flush */
|
|
png_uint_32 flush_rows; /* number of rows written since last flush */
|
|
#endif
|
|
|
|
#if defined(PNG_READ_GAMMA_SUPPORTED) || defined(PNG_READ_BACKGROUND_SUPPORTED)
|
|
int gamma_shift; /* number of "insignificant" bits 16-bit gamma */
|
|
#ifdef PNG_FLOATING_POINT_SUPPORTED
|
|
float gamma; /* file gamma value */
|
|
float screen_gamma; /* screen gamma value (display_exponent) */
|
|
#endif
|
|
#endif
|
|
|
|
#if defined(PNG_READ_GAMMA_SUPPORTED) || defined(PNG_READ_BACKGROUND_SUPPORTED)
|
|
png_bytep gamma_table; /* gamma table for 8-bit depth files */
|
|
png_bytep gamma_from_1; /* converts from 1.0 to screen */
|
|
png_bytep gamma_to_1; /* converts from file to 1.0 */
|
|
png_uint_16pp gamma_16_table; /* gamma table for 16-bit depth files */
|
|
png_uint_16pp gamma_16_from_1; /* converts from 1.0 to screen */
|
|
png_uint_16pp gamma_16_to_1; /* converts from file to 1.0 */
|
|
#endif
|
|
|
|
#if defined(PNG_READ_GAMMA_SUPPORTED) || defined(PNG_sBIT_SUPPORTED)
|
|
png_color_8 sig_bit; /* significant bits in each available channel */
|
|
#endif
|
|
|
|
#if defined(PNG_READ_SHIFT_SUPPORTED) || defined(PNG_WRITE_SHIFT_SUPPORTED)
|
|
png_color_8 shift; /* shift for significant bit tranformation */
|
|
#endif
|
|
|
|
#if defined(PNG_tRNS_SUPPORTED) || defined(PNG_READ_BACKGROUND_SUPPORTED) \
|
|
|| defined(PNG_READ_EXPAND_SUPPORTED) || defined(PNG_READ_BACKGROUND_SUPPORTED)
|
|
png_bytep trans; /* transparency values for paletted files */
|
|
png_color_16 trans_values; /* transparency values for non-paletted files */
|
|
#endif
|
|
|
|
png_read_status_ptr read_row_fn; /* called after each row is decoded */
|
|
png_write_status_ptr write_row_fn; /* called after each row is encoded */
|
|
#ifdef PNG_PROGRESSIVE_READ_SUPPORTED
|
|
png_progressive_info_ptr info_fn; /* called after header data fully read */
|
|
png_progressive_row_ptr row_fn; /* called after each prog. row is decoded */
|
|
png_progressive_end_ptr end_fn; /* called after image is complete */
|
|
png_bytep save_buffer_ptr; /* current location in save_buffer */
|
|
png_bytep save_buffer; /* buffer for previously read data */
|
|
png_bytep current_buffer_ptr; /* current location in current_buffer */
|
|
png_bytep current_buffer; /* buffer for recently used data */
|
|
png_uint_32 push_length; /* size of current input chunk */
|
|
png_uint_32 skip_length; /* bytes to skip in input data */
|
|
png_size_t save_buffer_size; /* amount of data now in save_buffer */
|
|
png_size_t save_buffer_max; /* total size of save_buffer */
|
|
png_size_t buffer_size; /* total amount of available input data */
|
|
png_size_t current_buffer_size; /* amount of data now in current_buffer */
|
|
int process_mode; /* what push library is currently doing */
|
|
int cur_palette; /* current push library palette index */
|
|
|
|
# if defined(PNG_TEXT_SUPPORTED)
|
|
png_size_t current_text_size; /* current size of text input data */
|
|
png_size_t current_text_left; /* how much text left to read in input */
|
|
png_charp current_text; /* current text chunk buffer */
|
|
png_charp current_text_ptr; /* current location in current_text */
|
|
# endif /* PNG_PROGRESSIVE_READ_SUPPORTED && PNG_TEXT_SUPPORTED */
|
|
|
|
#endif /* PNG_PROGRESSIVE_READ_SUPPORTED */
|
|
|
|
#if defined(__TURBOC__) && !defined(_Windows) && !defined(__FLAT__)
|
|
/* for the Borland special 64K segment handler */
|
|
png_bytepp offset_table_ptr;
|
|
png_bytep offset_table;
|
|
png_uint_16 offset_table_number;
|
|
png_uint_16 offset_table_count;
|
|
png_uint_16 offset_table_count_free;
|
|
#endif
|
|
|
|
#if defined(PNG_READ_DITHER_SUPPORTED)
|
|
png_bytep palette_lookup; /* lookup table for dithering */
|
|
png_bytep dither_index; /* index translation for palette files */
|
|
#endif
|
|
|
|
#if defined(PNG_READ_DITHER_SUPPORTED) || defined(PNG_hIST_SUPPORTED)
|
|
png_uint_16p hist; /* histogram */
|
|
#endif
|
|
|
|
#if defined(PNG_WRITE_WEIGHTED_FILTER_SUPPORTED)
|
|
png_byte heuristic_method; /* heuristic for row filter selection */
|
|
png_byte num_prev_filters; /* number of weights for previous rows */
|
|
png_bytep prev_filters; /* filter type(s) of previous row(s) */
|
|
png_uint_16p filter_weights; /* weight(s) for previous line(s) */
|
|
png_uint_16p inv_filter_weights; /* 1/weight(s) for previous line(s) */
|
|
png_uint_16p filter_costs; /* relative filter calculation cost */
|
|
png_uint_16p inv_filter_costs; /* 1/relative filter calculation cost */
|
|
#endif
|
|
|
|
#if defined(PNG_TIME_RFC1123_SUPPORTED)
|
|
png_charp time_buffer; /* String to hold RFC 1123 time text */
|
|
#endif
|
|
|
|
/* New members added in libpng-1.0.6 */
|
|
|
|
#ifdef PNG_FREE_ME_SUPPORTED
|
|
png_uint_32 free_me; /* flags items libpng is responsible for freeing */
|
|
#endif
|
|
|
|
#if defined(PNG_USER_CHUNKS_SUPPORTED)
|
|
png_voidp user_chunk_ptr;
|
|
png_user_chunk_ptr read_user_chunk_fn; /* user read chunk handler */
|
|
#endif
|
|
|
|
#if defined(PNG_UNKNOWN_CHUNKS_SUPPORTED)
|
|
int num_chunk_list;
|
|
png_bytep chunk_list;
|
|
#endif
|
|
|
|
/* New members added in libpng-1.0.3 */
|
|
#if defined(PNG_READ_RGB_TO_GRAY_SUPPORTED)
|
|
png_byte rgb_to_gray_status;
|
|
/* These were changed from png_byte in libpng-1.0.6 */
|
|
png_uint_16 rgb_to_gray_red_coeff;
|
|
png_uint_16 rgb_to_gray_green_coeff;
|
|
png_uint_16 rgb_to_gray_blue_coeff;
|
|
#endif
|
|
|
|
/* New member added in libpng-1.0.4 (renamed in 1.0.9) */
|
|
#if defined(PNG_MNG_FEATURES_SUPPORTED) || \
|
|
defined(PNG_READ_EMPTY_PLTE_SUPPORTED) || \
|
|
defined(PNG_WRITE_EMPTY_PLTE_SUPPORTED)
|
|
/* changed from png_byte to png_uint_32 at version 1.2.0 */
|
|
png_uint_32 mng_features_permitted;
|
|
#endif
|
|
|
|
/* New member added in libpng-1.0.7 */
|
|
#if defined(PNG_READ_GAMMA_SUPPORTED) || defined(PNG_READ_BACKGROUND_SUPPORTED)
|
|
png_fixed_point int_gamma;
|
|
#endif
|
|
|
|
/* New member added in libpng-1.0.9, ifdef'ed out in 1.0.12, enabled in 1.2.0 */
|
|
#if defined(PNG_MNG_FEATURES_SUPPORTED)
|
|
png_byte filter_type;
|
|
#endif
|
|
|
|
/* New member added in libpng-1.0.10, ifdef'ed out in 1.2.0 */
|
|
#if (defined(PNG_DEBUG) && defined(PNG_USE_PNGGCCRD))
|
|
png_uint_32 row_buf_size;
|
|
#endif
|
|
|
|
/* New members added in libpng-1.2.0 */
|
|
|
|
/* New members added in libpng-1.0.2 but first enabled by default in 1.2.0 */
|
|
#ifdef PNG_USER_MEM_SUPPORTED
|
|
png_voidp mem_ptr; /* user supplied struct for mem functions */
|
|
png_malloc_ptr malloc_fn; /* function for allocating memory */
|
|
png_free_ptr free_fn; /* function for freeing memory */
|
|
#endif
|
|
|
|
/* New member added in libpng-1.0.13 and 1.2.0 */
|
|
png_bytep big_row_buf; /* buffer to save current (unfiltered) row */
|
|
|
|
#if defined(PNG_READ_DITHER_SUPPORTED)
|
|
/* The following three members were added at version 1.0.14 and 1.2.4 */
|
|
png_bytep dither_sort; /* working sort array */
|
|
png_bytep index_to_palette; /* where the original index currently is */
|
|
/* in the palette */
|
|
png_bytep palette_to_index; /* which original index points to this */
|
|
/* palette color */
|
|
#endif
|
|
|
|
/* New members added in libpng-1.0.16 and 1.2.6 */
|
|
png_byte compression_type;
|
|
|
|
#ifdef PNG_SET_USER_LIMITS_SUPPORTED
|
|
png_uint_32 user_width_max;
|
|
png_uint_32 user_height_max;
|
|
/* Added in libpng-1.4.0: Total number of sPLT, text, and unknown
|
|
* chunks that can be stored (0x7fffffff means unlimited).
|
|
|
|
*/
|
|
png_uint_32 user_chunk_cache_max;
|
|
#endif
|
|
|
|
/* New member added in libpng-1.0.25 and 1.2.17 */
|
|
#if defined(PNG_UNKNOWN_CHUNKS_SUPPORTED)
|
|
/* storage for unknown chunk that the library doesn't recognize. */
|
|
png_unknown_chunk unknown_chunk;
|
|
#endif
|
|
|
|
/* New members added in libpng-1.2.26 */
|
|
png_uint_32 old_big_row_buf_size, old_prev_row_size;
|
|
|
|
/* New member added in libpng-1.2.30 */
|
|
png_charp chunkdata; /* buffer for reading chunk data */
|
|
|
|
/* New member added in libpng-1.4.0 */
|
|
#ifdef PNG_IO_STATE_SUPPORTED
|
|
png_uint_32 io_state;
|
|
#endif
|
|
};
|
|
|
|
|
|
/* This triggers a compiler error in png.c, if png.c and png.h
|
|
* do not agree upon the version number.
|
|
*/
|
|
typedef png_structp version_1_4_0beta33;
|
|
|
|
typedef png_struct FAR * FAR * png_structpp;
|
|
|
|
/* Here are the function definitions most commonly used. This is not
|
|
* the place to find out how to use libpng. See libpng.txt for the
|
|
* full explanation, see example.c for the summary. This just provides
|
|
* a simple one line description of the use of each function.
|
|
*/
|
|
|
|
/* Returns the version number of the library */
|
|
extern PNG_EXPORT(png_uint_32,png_access_version_number) PNGARG((void));
|
|
|
|
/* Tell lib we have already handled the first <num_bytes> magic bytes.
|
|
* Handling more than 8 bytes from the beginning of the file is an error.
|
|
*/
|
|
extern PNG_EXPORT(void,png_set_sig_bytes) PNGARG((png_structp png_ptr,
|
|
int num_bytes));
|
|
|
|
/* Check sig[start] through sig[start + num_to_check - 1] to see if it's a
|
|
* PNG file. Returns zero if the supplied bytes match the 8-byte PNG
|
|
* signature, and non-zero otherwise. Having num_to_check == 0 or
|
|
* start > 7 will always fail (ie return non-zero).
|
|
*/
|
|
extern PNG_EXPORT(int,png_sig_cmp) PNGARG((png_bytep sig, png_size_t start,
|
|
png_size_t num_to_check));
|
|
|
|
/* Simple signature checking function. This is the same as calling
|
|
* png_check_sig(sig, n) := !png_sig_cmp(sig, 0, n).
|
|
*/
|
|
#define png_check_sig(sig,n) !png_sig_cmp((sig), 0, (n))
|
|
|
|
/* Allocate and initialize png_ptr struct for reading, and any other memory. */
|
|
extern PNG_EXPORT(png_structp,png_create_read_struct)
|
|
PNGARG((png_const_charp user_png_ver, png_voidp error_ptr,
|
|
png_error_ptr error_fn, png_error_ptr warn_fn));
|
|
|
|
/* Allocate and initialize png_ptr struct for writing, and any other memory */
|
|
extern PNG_EXPORT(png_structp,png_create_write_struct)
|
|
PNGARG((png_const_charp user_png_ver, png_voidp error_ptr,
|
|
png_error_ptr error_fn, png_error_ptr warn_fn));
|
|
|
|
#ifdef PNG_WRITE_SUPPORTED
|
|
extern PNG_EXPORT(png_size_t,png_get_compression_buffer_size)
|
|
PNGARG((png_structp png_ptr));
|
|
#endif
|
|
|
|
#ifdef PNG_WRITE_SUPPORTED
|
|
extern PNG_EXPORT(void,png_set_compression_buffer_size)
|
|
PNGARG((png_structp png_ptr, png_size_t size));
|
|
#endif
|
|
|
|
/* Reset the compression stream */
|
|
extern PNG_EXPORT(int,png_reset_zstream) PNGARG((png_structp png_ptr));
|
|
|
|
/* New functions added in libpng-1.0.2 (not enabled by default until 1.2.0) */
|
|
#ifdef PNG_USER_MEM_SUPPORTED
|
|
extern PNG_EXPORT(png_structp,png_create_read_struct_2)
|
|
PNGARG((png_const_charp user_png_ver, png_voidp error_ptr,
|
|
png_error_ptr error_fn, png_error_ptr warn_fn, png_voidp mem_ptr,
|
|
png_malloc_ptr malloc_fn, png_free_ptr free_fn));
|
|
extern PNG_EXPORT(png_structp,png_create_write_struct_2)
|
|
PNGARG((png_const_charp user_png_ver, png_voidp error_ptr,
|
|
png_error_ptr error_fn, png_error_ptr warn_fn, png_voidp mem_ptr,
|
|
png_malloc_ptr malloc_fn, png_free_ptr free_fn));
|
|
#endif
|
|
|
|
/* Write the PNG file signature. */
|
|
extern PNG_EXPORT(void,png_write_sig) PNGARG((png_structp png_ptr));
|
|
|
|
/* Write a PNG chunk - size, type, (optional) data, CRC. */
|
|
extern PNG_EXPORT(void,png_write_chunk) PNGARG((png_structp png_ptr,
|
|
png_bytep chunk_name, png_bytep data, png_size_t length));
|
|
|
|
/* Write the start of a PNG chunk - length and chunk name. */
|
|
extern PNG_EXPORT(void,png_write_chunk_start) PNGARG((png_structp png_ptr,
|
|
png_bytep chunk_name, png_uint_32 length));
|
|
|
|
/* Write the data of a PNG chunk started with png_write_chunk_start(). */
|
|
extern PNG_EXPORT(void,png_write_chunk_data) PNGARG((png_structp png_ptr,
|
|
png_bytep data, png_size_t length));
|
|
|
|
/* Finish a chunk started with png_write_chunk_start() (includes CRC). */
|
|
extern PNG_EXPORT(void,png_write_chunk_end) PNGARG((png_structp png_ptr));
|
|
|
|
/* Allocate and initialize the info structure */
|
|
extern PNG_EXPORT(png_infop,png_create_info_struct)
|
|
PNGARG((png_structp png_ptr));
|
|
|
|
extern PNG_EXPORT(void,png_info_init_3) PNGARG((png_infopp info_ptr,
|
|
png_size_t png_info_struct_size));
|
|
|
|
/* Writes all the PNG information before the image. */
|
|
extern PNG_EXPORT(void,png_write_info_before_PLTE) PNGARG((png_structp png_ptr,
|
|
png_infop info_ptr));
|
|
extern PNG_EXPORT(void,png_write_info) PNGARG((png_structp png_ptr,
|
|
png_infop info_ptr));
|
|
|
|
#ifndef PNG_NO_SEQUENTIAL_READ_SUPPORTED
|
|
/* read the information before the actual image data. */
|
|
extern PNG_EXPORT(void,png_read_info) PNGARG((png_structp png_ptr,
|
|
png_infop info_ptr));
|
|
#endif
|
|
|
|
#if defined(PNG_TIME_RFC1123_SUPPORTED)
|
|
extern PNG_EXPORT(png_charp,png_convert_to_rfc1123)
|
|
PNGARG((png_structp png_ptr, png_timep ptime));
|
|
#endif
|
|
|
|
#if defined(PNG_WRITE_tIME_SUPPORTED)
|
|
/* convert from a struct tm to png_time */
|
|
extern PNG_EXPORT(void,png_convert_from_struct_tm) PNGARG((png_timep ptime,
|
|
struct tm FAR * ttime));
|
|
|
|
/* convert from time_t to png_time. Uses gmtime() */
|
|
extern PNG_EXPORT(void,png_convert_from_time_t) PNGARG((png_timep ptime,
|
|
time_t ttime));
|
|
#endif /* PNG_WRITE_tIME_SUPPORTED */
|
|
|
|
#if defined(PNG_READ_EXPAND_SUPPORTED)
|
|
/* Expand data to 24-bit RGB, or 8-bit grayscale, with alpha if available. */
|
|
extern PNG_EXPORT(void,png_set_expand) PNGARG((png_structp png_ptr));
|
|
extern PNG_EXPORT(void,png_set_expand_gray_1_2_4_to_8) PNGARG((png_structp
|
|
png_ptr));
|
|
extern PNG_EXPORT(void,png_set_palette_to_rgb) PNGARG((png_structp png_ptr));
|
|
extern PNG_EXPORT(void,png_set_tRNS_to_alpha) PNGARG((png_structp png_ptr));
|
|
#endif
|
|
|
|
#if defined(PNG_READ_BGR_SUPPORTED) || defined(PNG_WRITE_BGR_SUPPORTED)
|
|
/* Use blue, green, red order for pixels. */
|
|
extern PNG_EXPORT(void,png_set_bgr) PNGARG((png_structp png_ptr));
|
|
#endif
|
|
|
|
#if defined(PNG_READ_GRAY_TO_RGB_SUPPORTED)
|
|
/* Expand the grayscale to 24-bit RGB if necessary. */
|
|
extern PNG_EXPORT(void,png_set_gray_to_rgb) PNGARG((png_structp png_ptr));
|
|
#endif
|
|
|
|
#if defined(PNG_READ_RGB_TO_GRAY_SUPPORTED)
|
|
/* Reduce RGB to grayscale. */
|
|
#ifdef PNG_FLOATING_POINT_SUPPORTED
|
|
extern PNG_EXPORT(void,png_set_rgb_to_gray) PNGARG((png_structp png_ptr,
|
|
int error_action, double red, double green ));
|
|
#endif
|
|
extern PNG_EXPORT(void,png_set_rgb_to_gray_fixed) PNGARG((png_structp png_ptr,
|
|
int error_action, png_fixed_point red, png_fixed_point green ));
|
|
extern PNG_EXPORT(png_byte,png_get_rgb_to_gray_status) PNGARG((png_structp
|
|
png_ptr));
|
|
#endif
|
|
|
|
extern PNG_EXPORT(void,png_build_grayscale_palette) PNGARG((int bit_depth,
|
|
png_colorp palette));
|
|
|
|
#if defined(PNG_READ_STRIP_ALPHA_SUPPORTED)
|
|
extern PNG_EXPORT(void,png_set_strip_alpha) PNGARG((png_structp png_ptr));
|
|
#endif
|
|
|
|
#if defined(PNG_READ_SWAP_ALPHA_SUPPORTED) || \
|
|
defined(PNG_WRITE_SWAP_ALPHA_SUPPORTED)
|
|
extern PNG_EXPORT(void,png_set_swap_alpha) PNGARG((png_structp png_ptr));
|
|
#endif
|
|
|
|
#if defined(PNG_READ_INVERT_ALPHA_SUPPORTED) || \
|
|
defined(PNG_WRITE_INVERT_ALPHA_SUPPORTED)
|
|
extern PNG_EXPORT(void,png_set_invert_alpha) PNGARG((png_structp png_ptr));
|
|
#endif
|
|
|
|
#if defined(PNG_READ_PREMULTIPLY_ALPHA_SUPPORTED)
|
|
extern PNG_EXPORT(void,png_set_premultiply_alpha) PNGARG((png_structp png_ptr));
|
|
#endif
|
|
|
|
#if defined(PNG_READ_FILLER_SUPPORTED) || defined(PNG_WRITE_FILLER_SUPPORTED)
|
|
/* Add a filler byte to 8-bit Gray or 24-bit RGB images. */
|
|
extern PNG_EXPORT(void,png_set_filler) PNGARG((png_structp png_ptr,
|
|
png_uint_32 filler, int flags));
|
|
/* The values of the PNG_FILLER_ defines should NOT be changed */
|
|
#define PNG_FILLER_BEFORE 0
|
|
#define PNG_FILLER_AFTER 1
|
|
/* Add an alpha byte to 8-bit Gray or 24-bit RGB images. */
|
|
extern PNG_EXPORT(void,png_set_add_alpha) PNGARG((png_structp png_ptr,
|
|
png_uint_32 filler, int flags));
|
|
#endif /* PNG_READ_FILLER_SUPPORTED || PNG_WRITE_FILLER_SUPPORTED */
|
|
|
|
#if defined(PNG_READ_SWAP_SUPPORTED) || defined(PNG_WRITE_SWAP_SUPPORTED)
|
|
/* Swap bytes in 16-bit depth files. */
|
|
extern PNG_EXPORT(void,png_set_swap) PNGARG((png_structp png_ptr));
|
|
#endif
|
|
|
|
#if defined(PNG_READ_PACK_SUPPORTED) || defined(PNG_WRITE_PACK_SUPPORTED)
|
|
/* Use 1 byte per pixel in 1, 2, or 4-bit depth files. */
|
|
extern PNG_EXPORT(void,png_set_packing) PNGARG((png_structp png_ptr));
|
|
#endif
|
|
|
|
#if defined(PNG_READ_PACKSWAP_SUPPORTED) || defined(PNG_WRITE_PACKSWAP_SUPPORTED)
|
|
/* Swap packing order of pixels in bytes. */
|
|
extern PNG_EXPORT(void,png_set_packswap) PNGARG((png_structp png_ptr));
|
|
#endif
|
|
|
|
#if defined(PNG_READ_SHIFT_SUPPORTED) || defined(PNG_WRITE_SHIFT_SUPPORTED)
|
|
/* Converts files to legal bit depths. */
|
|
extern PNG_EXPORT(void,png_set_shift) PNGARG((png_structp png_ptr,
|
|
png_color_8p true_bits));
|
|
#endif
|
|
|
|
#if defined(PNG_READ_INTERLACING_SUPPORTED) || \
|
|
defined(PNG_WRITE_INTERLACING_SUPPORTED)
|
|
/* Have the code handle the interlacing. Returns the number of passes. */
|
|
extern PNG_EXPORT(int,png_set_interlace_handling) PNGARG((png_structp png_ptr));
|
|
#endif
|
|
|
|
#if defined(PNG_READ_INVERT_SUPPORTED) || defined(PNG_WRITE_INVERT_SUPPORTED)
|
|
/* Invert monochrome files */
|
|
extern PNG_EXPORT(void,png_set_invert_mono) PNGARG((png_structp png_ptr));
|
|
#endif
|
|
|
|
#if defined(PNG_READ_BACKGROUND_SUPPORTED)
|
|
/* Handle alpha and tRNS by replacing with a background color. */
|
|
#ifdef PNG_FLOATING_POINT_SUPPORTED
|
|
extern PNG_EXPORT(void,png_set_background) PNGARG((png_structp png_ptr,
|
|
png_color_16p background_color, int background_gamma_code,
|
|
int need_expand, double background_gamma));
|
|
#endif
|
|
#define PNG_BACKGROUND_GAMMA_UNKNOWN 0
|
|
#define PNG_BACKGROUND_GAMMA_SCREEN 1
|
|
#define PNG_BACKGROUND_GAMMA_FILE 2
|
|
#define PNG_BACKGROUND_GAMMA_UNIQUE 3
|
|
#endif
|
|
|
|
#if defined(PNG_READ_16_TO_8_SUPPORTED)
|
|
/* strip the second byte of information from a 16-bit depth file. */
|
|
extern PNG_EXPORT(void,png_set_strip_16) PNGARG((png_structp png_ptr));
|
|
#endif
|
|
|
|
#if defined(PNG_READ_DITHER_SUPPORTED)
|
|
/* Turn on dithering, and reduce the palette to the number of colors available. */
|
|
extern PNG_EXPORT(void,png_set_dither) PNGARG((png_structp png_ptr,
|
|
png_colorp palette, int num_palette, int maximum_colors,
|
|
png_uint_16p histogram, int full_dither));
|
|
#endif
|
|
|
|
#if defined(PNG_READ_GAMMA_SUPPORTED)
|
|
/* Handle gamma correction. Screen_gamma=(display_exponent) */
|
|
#ifdef PNG_FLOATING_POINT_SUPPORTED
|
|
extern PNG_EXPORT(void,png_set_gamma) PNGARG((png_structp png_ptr,
|
|
double screen_gamma, double default_file_gamma));
|
|
#endif
|
|
#endif
|
|
|
|
|
|
#if defined(PNG_WRITE_FLUSH_SUPPORTED)
|
|
/* Set how many lines between output flushes - 0 for no flushing */
|
|
extern PNG_EXPORT(void,png_set_flush) PNGARG((png_structp png_ptr, int nrows));
|
|
/* Flush the current PNG output buffer */
|
|
extern PNG_EXPORT(void,png_write_flush) PNGARG((png_structp png_ptr));
|
|
#endif
|
|
|
|
/* optional update palette with requested transformations */
|
|
extern PNG_EXPORT(void,png_start_read_image) PNGARG((png_structp png_ptr));
|
|
|
|
/* optional call to update the users info structure */
|
|
extern PNG_EXPORT(void,png_read_update_info) PNGARG((png_structp png_ptr,
|
|
png_infop info_ptr));
|
|
|
|
#ifndef PNG_NO_SEQUENTIAL_READ_SUPPORTED
|
|
/* read one or more rows of image data. */
|
|
extern PNG_EXPORT(void,png_read_rows) PNGARG((png_structp png_ptr,
|
|
png_bytepp row, png_bytepp display_row, png_uint_32 num_rows));
|
|
#endif
|
|
|
|
#ifndef PNG_NO_SEQUENTIAL_READ_SUPPORTED
|
|
/* read a row of data. */
|
|
extern PNG_EXPORT(void,png_read_row) PNGARG((png_structp png_ptr,
|
|
png_bytep row,
|
|
png_bytep display_row));
|
|
#endif
|
|
|
|
#ifndef PNG_NO_SEQUENTIAL_READ_SUPPORTED
|
|
/* read the whole image into memory at once. */
|
|
extern PNG_EXPORT(void,png_read_image) PNGARG((png_structp png_ptr,
|
|
png_bytepp image));
|
|
#endif
|
|
|
|
/* write a row of image data */
|
|
extern PNG_EXPORT(void,png_write_row) PNGARG((png_structp png_ptr,
|
|
png_bytep row));
|
|
|
|
/* write a few rows of image data */
|
|
extern PNG_EXPORT(void,png_write_rows) PNGARG((png_structp png_ptr,
|
|
png_bytepp row, png_uint_32 num_rows));
|
|
|
|
/* write the image data */
|
|
extern PNG_EXPORT(void,png_write_image) PNGARG((png_structp png_ptr,
|
|
png_bytepp image));
|
|
|
|
/* writes the end of the PNG file. */
|
|
extern PNG_EXPORT(void,png_write_end) PNGARG((png_structp png_ptr,
|
|
png_infop info_ptr));
|
|
|
|
#ifndef PNG_NO_SEQUENTIAL_READ_SUPPORTED
|
|
/* read the end of the PNG file. */
|
|
extern PNG_EXPORT(void,png_read_end) PNGARG((png_structp png_ptr,
|
|
png_infop info_ptr));
|
|
#endif
|
|
|
|
/* free any memory associated with the png_info_struct */
|
|
extern PNG_EXPORT(void,png_destroy_info_struct) PNGARG((png_structp png_ptr,
|
|
png_infopp info_ptr_ptr));
|
|
|
|
/* free any memory associated with the png_struct and the png_info_structs */
|
|
extern PNG_EXPORT(void,png_destroy_read_struct) PNGARG((png_structpp
|
|
png_ptr_ptr, png_infopp info_ptr_ptr, png_infopp end_info_ptr_ptr));
|
|
|
|
/* free all memory used by the read (old method - NOT DLL EXPORTED) */
|
|
extern void png_read_destroy PNGARG((png_structp png_ptr, png_infop info_ptr,
|
|
png_infop end_info_ptr));
|
|
|
|
/* free any memory associated with the png_struct and the png_info_structs */
|
|
extern PNG_EXPORT(void,png_destroy_write_struct)
|
|
PNGARG((png_structpp png_ptr_ptr, png_infopp info_ptr_ptr));
|
|
|
|
/* free any memory used in png_ptr struct (old method - NOT DLL EXPORTED) */
|
|
extern void png_write_destroy PNGARG((png_structp png_ptr));
|
|
|
|
/* set the libpng method of handling chunk CRC errors */
|
|
extern PNG_EXPORT(void,png_set_crc_action) PNGARG((png_structp png_ptr,
|
|
int crit_action, int ancil_action));
|
|
|
|
/* Values for png_set_crc_action() to say how to handle CRC errors in
|
|
* ancillary and critical chunks, and whether to use the data contained
|
|
* therein. Note that it is impossible to "discard" data in a critical
|
|
* chunk. For versions prior to 0.90, the action was always error/quit,
|
|
* whereas in version 0.90 and later, the action for CRC errors in ancillary
|
|
* chunks is warn/discard. These values should NOT be changed.
|
|
*
|
|
* value action:critical action:ancillary
|
|
*/
|
|
#define PNG_CRC_DEFAULT 0 /* error/quit warn/discard data */
|
|
#define PNG_CRC_ERROR_QUIT 1 /* error/quit error/quit */
|
|
#define PNG_CRC_WARN_DISCARD 2 /* (INVALID) warn/discard data */
|
|
#define PNG_CRC_WARN_USE 3 /* warn/use data warn/use data */
|
|
#define PNG_CRC_QUIET_USE 4 /* quiet/use data quiet/use data */
|
|
#define PNG_CRC_NO_CHANGE 5 /* use current value use current value */
|
|
|
|
/* These functions give the user control over the scan-line filtering in
|
|
* libpng and the compression methods used by zlib. These functions are
|
|
* mainly useful for testing, as the defaults should work with most users.
|
|
* Those users who are tight on memory or want faster performance at the
|
|
* expense of compression can modify them. See the compression library
|
|
* header file (zlib.h) for an explination of the compression functions.
|
|
*/
|
|
|
|
/* set the filtering method(s) used by libpng. Currently, the only valid
|
|
* value for "method" is 0.
|
|
*/
|
|
extern PNG_EXPORT(void,png_set_filter) PNGARG((png_structp png_ptr, int method,
|
|
int filters));
|
|
|
|
/* Flags for png_set_filter() to say which filters to use. The flags
|
|
* are chosen so that they don't conflict with real filter types
|
|
* below, in case they are supplied instead of the #defined constants.
|
|
* These values should NOT be changed.
|
|
*/
|
|
#define PNG_NO_FILTERS 0x00
|
|
#define PNG_FILTER_NONE 0x08
|
|
#define PNG_FILTER_SUB 0x10
|
|
#define PNG_FILTER_UP 0x20
|
|
#define PNG_FILTER_AVG 0x40
|
|
#define PNG_FILTER_PAETH 0x80
|
|
#define PNG_ALL_FILTERS (PNG_FILTER_NONE | PNG_FILTER_SUB | PNG_FILTER_UP | \
|
|
PNG_FILTER_AVG | PNG_FILTER_PAETH)
|
|
|
|
/* Filter values (not flags) - used in pngwrite.c, pngwutil.c for now.
|
|
* These defines should NOT be changed.
|
|
*/
|
|
#define PNG_FILTER_VALUE_NONE 0
|
|
#define PNG_FILTER_VALUE_SUB 1
|
|
#define PNG_FILTER_VALUE_UP 2
|
|
#define PNG_FILTER_VALUE_AVG 3
|
|
#define PNG_FILTER_VALUE_PAETH 4
|
|
#define PNG_FILTER_VALUE_LAST 5
|
|
|
|
#if defined(PNG_WRITE_WEIGHTED_FILTER_SUPPORTED) /* EXPERIMENTAL */
|
|
/* The "heuristic_method" is given by one of the PNG_FILTER_HEURISTIC_
|
|
* defines, either the default (minimum-sum-of-absolute-differences), or
|
|
* the experimental method (weighted-minimum-sum-of-absolute-differences).
|
|
*
|
|
* Weights are factors >= 1.0, indicating how important it is to keep the
|
|
* filter type consistent between rows. Larger numbers mean the current
|
|
* filter is that many times as likely to be the same as the "num_weights"
|
|
* previous filters. This is cumulative for each previous row with a weight.
|
|
* There needs to be "num_weights" values in "filter_weights", or it can be
|
|
* NULL if the weights aren't being specified. Weights have no influence on
|
|
* the selection of the first row filter. Well chosen weights can (in theory)
|
|
* improve the compression for a given image.
|
|
*
|
|
* Costs are factors >= 1.0 indicating the relative decoding costs of a
|
|
* filter type. Higher costs indicate more decoding expense, and are
|
|
* therefore less likely to be selected over a filter with lower computational
|
|
* costs. There needs to be a value in "filter_costs" for each valid filter
|
|
* type (given by PNG_FILTER_VALUE_LAST), or it can be NULL if you aren't
|
|
* setting the costs. Costs try to improve the speed of decompression without
|
|
* unduly increasing the compressed image size.
|
|
*
|
|
* A negative weight or cost indicates the default value is to be used, and
|
|
* values in the range [0.0, 1.0) indicate the value is to remain unchanged.
|
|
* The default values for both weights and costs are currently 1.0, but may
|
|
* change if good general weighting/cost heuristics can be found. If both
|
|
* the weights and costs are set to 1.0, this degenerates the WEIGHTED method
|
|
* to the UNWEIGHTED method, but with added encoding time/computation.
|
|
*/
|
|
#ifdef PNG_FLOATING_POINT_SUPPORTED
|
|
extern PNG_EXPORT(void,png_set_filter_heuristics) PNGARG((png_structp png_ptr,
|
|
int heuristic_method, int num_weights, png_doublep filter_weights,
|
|
png_doublep filter_costs));
|
|
#endif
|
|
#endif /* PNG_WRITE_WEIGHTED_FILTER_SUPPORTED */
|
|
|
|
/* Heuristic used for row filter selection. These defines should NOT be
|
|
* changed.
|
|
*/
|
|
#define PNG_FILTER_HEURISTIC_DEFAULT 0 /* Currently "UNWEIGHTED" */
|
|
#define PNG_FILTER_HEURISTIC_UNWEIGHTED 1 /* Used by libpng < 0.95 */
|
|
#define PNG_FILTER_HEURISTIC_WEIGHTED 2 /* Experimental feature */
|
|
#define PNG_FILTER_HEURISTIC_LAST 3 /* Not a valid value */
|
|
|
|
/* Set the library compression level. Currently, valid values range from
|
|
* 0 - 9, corresponding directly to the zlib compression levels 0 - 9
|
|
* (0 - no compression, 9 - "maximal" compression). Note that tests have
|
|
* shown that zlib compression levels 3-6 usually perform as well as level 9
|
|
* for PNG images, and do considerably fewer caclulations. In the future,
|
|
* these values may not correspond directly to the zlib compression levels.
|
|
*/
|
|
extern PNG_EXPORT(void,png_set_compression_level) PNGARG((png_structp png_ptr,
|
|
int level));
|
|
|
|
extern PNG_EXPORT(void,png_set_compression_mem_level)
|
|
PNGARG((png_structp png_ptr, int mem_level));
|
|
|
|
extern PNG_EXPORT(void,png_set_compression_strategy)
|
|
PNGARG((png_structp png_ptr, int strategy));
|
|
|
|
extern PNG_EXPORT(void,png_set_compression_window_bits)
|
|
PNGARG((png_structp png_ptr, int window_bits));
|
|
|
|
extern PNG_EXPORT(void,png_set_compression_method) PNGARG((png_structp png_ptr,
|
|
int method));
|
|
|
|
/* These next functions are called for input/output, memory, and error
|
|
* handling. They are in the file pngrio.c, pngwio.c, and pngerror.c,
|
|
* and call standard C I/O routines such as fread(), fwrite(), and
|
|
* fprintf(). These functions can be made to use other I/O routines
|
|
* at run time for those applications that need to handle I/O in a
|
|
* different manner by calling png_set_???_fn(). See libpng.txt for
|
|
* more information.
|
|
*/
|
|
|
|
#if !defined(PNG_NO_STDIO)
|
|
/* Initialize the input/output for the PNG file to the default functions. */
|
|
extern PNG_EXPORT(void,png_init_io) PNGARG((png_structp png_ptr, png_FILE_p fp));
|
|
#endif
|
|
|
|
/* Replace the (error and abort), and warning functions with user
|
|
* supplied functions. If no messages are to be printed you must still
|
|
* write and use replacement functions. The replacement error_fn should
|
|
* still do a longjmp to the last setjmp location if you are using this
|
|
* method of error handling. If error_fn or warning_fn is NULL, the
|
|
* default function will be used.
|
|
*/
|
|
|
|
extern PNG_EXPORT(void,png_set_error_fn) PNGARG((png_structp png_ptr,
|
|
png_voidp error_ptr, png_error_ptr error_fn, png_error_ptr warning_fn));
|
|
|
|
/* Return the user pointer associated with the error functions */
|
|
extern PNG_EXPORT(png_voidp,png_get_error_ptr) PNGARG((png_structp png_ptr));
|
|
|
|
/* Replace the default data output functions with a user supplied one(s).
|
|
* If buffered output is not used, then output_flush_fn can be set to NULL.
|
|
* If PNG_WRITE_FLUSH_SUPPORTED is not defined at libpng compile time
|
|
* output_flush_fn will be ignored (and thus can be NULL).
|
|
*/
|
|
extern PNG_EXPORT(void,png_set_write_fn) PNGARG((png_structp png_ptr,
|
|
png_voidp io_ptr, png_rw_ptr write_data_fn, png_flush_ptr output_flush_fn));
|
|
|
|
/* Replace the default data input function with a user supplied one. */
|
|
extern PNG_EXPORT(void,png_set_read_fn) PNGARG((png_structp png_ptr,
|
|
png_voidp io_ptr, png_rw_ptr read_data_fn));
|
|
|
|
/* Return the user pointer associated with the I/O functions */
|
|
extern PNG_EXPORT(png_voidp,png_get_io_ptr) PNGARG((png_structp png_ptr));
|
|
|
|
extern PNG_EXPORT(void,png_set_read_status_fn) PNGARG((png_structp png_ptr,
|
|
png_read_status_ptr read_row_fn));
|
|
|
|
extern PNG_EXPORT(void,png_set_write_status_fn) PNGARG((png_structp png_ptr,
|
|
png_write_status_ptr write_row_fn));
|
|
|
|
#ifdef PNG_USER_MEM_SUPPORTED
|
|
/* Replace the default memory allocation functions with user supplied one(s). */
|
|
extern PNG_EXPORT(void,png_set_mem_fn) PNGARG((png_structp png_ptr,
|
|
png_voidp mem_ptr, png_malloc_ptr malloc_fn, png_free_ptr free_fn));
|
|
/* Return the user pointer associated with the memory functions */
|
|
extern PNG_EXPORT(png_voidp,png_get_mem_ptr) PNGARG((png_structp png_ptr));
|
|
#endif
|
|
|
|
#if defined(PNG_READ_USER_TRANSFORM_SUPPORTED) || \
|
|
defined(PNG_LEGACY_SUPPORTED)
|
|
extern PNG_EXPORT(void,png_set_read_user_transform_fn) PNGARG((png_structp
|
|
png_ptr, png_user_transform_ptr read_user_transform_fn));
|
|
#endif
|
|
|
|
#if defined(PNG_WRITE_USER_TRANSFORM_SUPPORTED) || \
|
|
defined(PNG_LEGACY_SUPPORTED)
|
|
extern PNG_EXPORT(void,png_set_write_user_transform_fn) PNGARG((png_structp
|
|
png_ptr, png_user_transform_ptr write_user_transform_fn));
|
|
#endif
|
|
|
|
#if defined(PNG_READ_USER_TRANSFORM_SUPPORTED) || \
|
|
defined(PNG_WRITE_USER_TRANSFORM_SUPPORTED) || \
|
|
defined(PNG_LEGACY_SUPPORTED)
|
|
extern PNG_EXPORT(void,png_set_user_transform_info) PNGARG((png_structp
|
|
png_ptr, png_voidp user_transform_ptr, int user_transform_depth,
|
|
int user_transform_channels));
|
|
/* Return the user pointer associated with the user transform functions */
|
|
extern PNG_EXPORT(png_voidp,png_get_user_transform_ptr)
|
|
PNGARG((png_structp png_ptr));
|
|
#endif
|
|
|
|
#ifdef PNG_USER_CHUNKS_SUPPORTED
|
|
extern PNG_EXPORT(void,png_set_read_user_chunk_fn) PNGARG((png_structp png_ptr,
|
|
png_voidp user_chunk_ptr, png_user_chunk_ptr read_user_chunk_fn));
|
|
extern PNG_EXPORT(png_voidp,png_get_user_chunk_ptr) PNGARG((png_structp
|
|
png_ptr));
|
|
#endif
|
|
|
|
#ifdef PNG_PROGRESSIVE_READ_SUPPORTED
|
|
/* Sets the function callbacks for the push reader, and a pointer to a
|
|
* user-defined structure available to the callback functions.
|
|
*/
|
|
extern PNG_EXPORT(void,png_set_progressive_read_fn) PNGARG((png_structp png_ptr,
|
|
png_voidp progressive_ptr,
|
|
png_progressive_info_ptr info_fn, png_progressive_row_ptr row_fn,
|
|
png_progressive_end_ptr end_fn));
|
|
|
|
/* returns the user pointer associated with the push read functions */
|
|
extern PNG_EXPORT(png_voidp,png_get_progressive_ptr)
|
|
PNGARG((png_structp png_ptr));
|
|
|
|
/* function to be called when data becomes available */
|
|
extern PNG_EXPORT(void,png_process_data) PNGARG((png_structp png_ptr,
|
|
png_infop info_ptr, png_bytep buffer, png_size_t buffer_size));
|
|
|
|
/* function that combines rows. Not very much different than the
|
|
* png_combine_row() call. Is this even used?????
|
|
*/
|
|
extern PNG_EXPORT(void,png_progressive_combine_row) PNGARG((png_structp png_ptr,
|
|
png_bytep old_row, png_bytep new_row));
|
|
#endif /* PNG_PROGRESSIVE_READ_SUPPORTED */
|
|
|
|
extern PNG_EXPORT(png_voidp,png_malloc) PNGARG((png_structp png_ptr,
|
|
png_alloc_size_t size));
|
|
|
|
/* Added at libpng version 1.2.4 */
|
|
extern PNG_EXPORT(png_voidp,png_malloc_warn) PNGARG((png_structp png_ptr,
|
|
png_alloc_size_t size));
|
|
|
|
/* Frees a pointer allocated by png_malloc() */
|
|
extern PNG_EXPORT(void,png_free) PNGARG((png_structp png_ptr, png_voidp ptr));
|
|
extern PNG_EXPORT(void,png_freeptr) PNGARG((png_structp png_ptr,
|
|
png_voidp *ptr));
|
|
|
|
/* Free data that was allocated internally */
|
|
extern PNG_EXPORT(void,png_free_data) PNGARG((png_structp png_ptr,
|
|
png_infop info_ptr, png_uint_32 free_me, int num));
|
|
#ifdef PNG_FREE_ME_SUPPORTED
|
|
/* Reassign responsibility for freeing existing data, whether allocated
|
|
* by libpng or by the application */
|
|
extern PNG_EXPORT(void,png_data_freer) PNGARG((png_structp png_ptr,
|
|
png_infop info_ptr, int freer, png_uint_32 mask));
|
|
#endif
|
|
/* assignments for png_data_freer */
|
|
#define PNG_DESTROY_WILL_FREE_DATA 1
|
|
#define PNG_SET_WILL_FREE_DATA 1
|
|
#define PNG_USER_WILL_FREE_DATA 2
|
|
/* Flags for png_ptr->free_me and info_ptr->free_me */
|
|
#define PNG_FREE_HIST 0x0008
|
|
#define PNG_FREE_ICCP 0x0010
|
|
#define PNG_FREE_SPLT 0x0020
|
|
#define PNG_FREE_ROWS 0x0040
|
|
#define PNG_FREE_PCAL 0x0080
|
|
#define PNG_FREE_SCAL 0x0100
|
|
#define PNG_FREE_UNKN 0x0200
|
|
#define PNG_FREE_LIST 0x0400
|
|
#define PNG_FREE_PLTE 0x1000
|
|
#define PNG_FREE_TRNS 0x2000
|
|
#define PNG_FREE_TEXT 0x4000
|
|
#define PNG_FREE_ALL 0x7fff
|
|
#define PNG_FREE_MUL 0x4220 /* PNG_FREE_SPLT|PNG_FREE_TEXT|PNG_FREE_UNKN */
|
|
|
|
#ifdef PNG_USER_MEM_SUPPORTED
|
|
extern PNG_EXPORT(png_voidp,png_malloc_default) PNGARG((png_structp png_ptr,
|
|
png_alloc_size_t size));
|
|
extern PNG_EXPORT(void,png_free_default) PNGARG((png_structp png_ptr,
|
|
png_voidp ptr));
|
|
#endif
|
|
|
|
#if defined(USE_FAR_KEYWORD) /* memory model conversion function */
|
|
extern void *png_far_to_near PNGARG((png_structp png_ptr,png_voidp ptr,
|
|
int check));
|
|
#endif /* USE_FAR_KEYWORD */
|
|
|
|
/* Fatal error in PNG image of libpng - can't continue */
|
|
extern PNG_EXPORT(void,png_error) PNGARG((png_structp png_ptr,
|
|
png_const_charp error_message));
|
|
|
|
/* The same, but the chunk name is prepended to the error string. */
|
|
extern PNG_EXPORT(void,png_chunk_error) PNGARG((png_structp png_ptr,
|
|
png_const_charp error_message));
|
|
|
|
/* Non-fatal error in libpng. Can continue, but may have a problem. */
|
|
extern PNG_EXPORT(void,png_warning) PNGARG((png_structp png_ptr,
|
|
png_const_charp warning_message));
|
|
|
|
/* Non-fatal error in libpng, chunk name is prepended to message. */
|
|
extern PNG_EXPORT(void,png_chunk_warning) PNGARG((png_structp png_ptr,
|
|
png_const_charp warning_message));
|
|
|
|
#ifdef PNG_BENIGN_ERRORS_SUPPORTED
|
|
/* Benign error in libpng. Can continue, but may have a problem.
|
|
* User can choose whether to handle as a fatal error or as a warning. */
|
|
extern PNG_EXPORT(void,png_benign_error) PNGARG((png_structp png_ptr,
|
|
png_const_charp warning_message));
|
|
|
|
/* Same, chunk name is prepended to message. */
|
|
extern PNG_EXPORT(void,png_chunk_benign_error) PNGARG((png_structp png_ptr,
|
|
png_const_charp warning_message));
|
|
|
|
extern PNG_EXPORT(void,png_set_benign_errors) PNGARG((png_structp
|
|
png_ptr, int allowed));
|
|
#endif
|
|
|
|
/* The png_set_<chunk> functions are for storing values in the png_info_struct.
|
|
* Similarly, the png_get_<chunk> calls are used to read values from the
|
|
* png_info_struct, either storing the parameters in the passed variables, or
|
|
* setting pointers into the png_info_struct where the data is stored. The
|
|
* png_get_<chunk> functions return a non-zero value if the data was available
|
|
* in info_ptr, or return zero and do not change any of the parameters if the
|
|
* data was not available.
|
|
*
|
|
* These functions should be used instead of directly accessing png_info
|
|
* to avoid problems with future changes in the size and internal layout of
|
|
* png_info_struct.
|
|
*/
|
|
/* Returns "flag" if chunk data is valid in info_ptr. */
|
|
extern PNG_EXPORT(png_uint_32,png_get_valid) PNGARG((png_structp png_ptr,
|
|
png_infop info_ptr, png_uint_32 flag));
|
|
|
|
/* Returns number of bytes needed to hold a transformed row. */
|
|
extern PNG_EXPORT(png_size_t,png_get_rowbytes) PNGARG((png_structp png_ptr,
|
|
png_infop info_ptr));
|
|
|
|
#if defined(PNG_INFO_IMAGE_SUPPORTED)
|
|
/* Returns row_pointers, which is an array of pointers to scanlines that was
|
|
returned from png_read_png(). */
|
|
extern PNG_EXPORT(png_bytepp,png_get_rows) PNGARG((png_structp png_ptr,
|
|
png_infop info_ptr));
|
|
/* Set row_pointers, which is an array of pointers to scanlines for use
|
|
by png_write_png(). */
|
|
extern PNG_EXPORT(void,png_set_rows) PNGARG((png_structp png_ptr,
|
|
png_infop info_ptr, png_bytepp row_pointers));
|
|
#endif
|
|
|
|
/* Returns number of color channels in image. */
|
|
extern PNG_EXPORT(png_byte,png_get_channels) PNGARG((png_structp png_ptr,
|
|
png_infop info_ptr));
|
|
|
|
#ifdef PNG_EASY_ACCESS_SUPPORTED
|
|
/* Returns image width in pixels. */
|
|
extern PNG_EXPORT(png_uint_32, png_get_image_width) PNGARG((png_structp
|
|
png_ptr, png_infop info_ptr));
|
|
|
|
/* Returns image height in pixels. */
|
|
extern PNG_EXPORT(png_uint_32, png_get_image_height) PNGARG((png_structp
|
|
png_ptr, png_infop info_ptr));
|
|
|
|
/* Returns image bit_depth. */
|
|
extern PNG_EXPORT(png_byte, png_get_bit_depth) PNGARG((png_structp
|
|
png_ptr, png_infop info_ptr));
|
|
|
|
/* Returns image color_type. */
|
|
extern PNG_EXPORT(png_byte, png_get_color_type) PNGARG((png_structp
|
|
png_ptr, png_infop info_ptr));
|
|
|
|
/* Returns image filter_type. */
|
|
extern PNG_EXPORT(png_byte, png_get_filter_type) PNGARG((png_structp
|
|
png_ptr, png_infop info_ptr));
|
|
|
|
/* Returns image interlace_type. */
|
|
extern PNG_EXPORT(png_byte, png_get_interlace_type) PNGARG((png_structp
|
|
png_ptr, png_infop info_ptr));
|
|
|
|
/* Returns image compression_type. */
|
|
extern PNG_EXPORT(png_byte, png_get_compression_type) PNGARG((png_structp
|
|
png_ptr, png_infop info_ptr));
|
|
|
|
/* Returns image resolution in pixels per meter, from pHYs chunk data. */
|
|
extern PNG_EXPORT(png_uint_32, png_get_pixels_per_meter) PNGARG((png_structp
|
|
png_ptr, png_infop info_ptr));
|
|
extern PNG_EXPORT(png_uint_32, png_get_x_pixels_per_meter) PNGARG((png_structp
|
|
png_ptr, png_infop info_ptr));
|
|
extern PNG_EXPORT(png_uint_32, png_get_y_pixels_per_meter) PNGARG((png_structp
|
|
png_ptr, png_infop info_ptr));
|
|
|
|
/* Returns pixel aspect ratio, computed from pHYs chunk data. */
|
|
#ifdef PNG_FLOATING_POINT_SUPPORTED
|
|
extern PNG_EXPORT(float, png_get_pixel_aspect_ratio) PNGARG((png_structp
|
|
png_ptr, png_infop info_ptr));
|
|
#endif
|
|
|
|
/* Returns image x, y offset in pixels or microns, from oFFs chunk data. */
|
|
extern PNG_EXPORT(png_int_32, png_get_x_offset_pixels) PNGARG((png_structp
|
|
png_ptr, png_infop info_ptr));
|
|
extern PNG_EXPORT(png_int_32, png_get_y_offset_pixels) PNGARG((png_structp
|
|
png_ptr, png_infop info_ptr));
|
|
extern PNG_EXPORT(png_int_32, png_get_x_offset_microns) PNGARG((png_structp
|
|
png_ptr, png_infop info_ptr));
|
|
extern PNG_EXPORT(png_int_32, png_get_y_offset_microns) PNGARG((png_structp
|
|
png_ptr, png_infop info_ptr));
|
|
|
|
#endif /* PNG_EASY_ACCESS_SUPPORTED */
|
|
|
|
/* Returns pointer to signature string read from PNG header */
|
|
extern PNG_EXPORT(png_bytep,png_get_signature) PNGARG((png_structp png_ptr,
|
|
png_infop info_ptr));
|
|
|
|
#if defined(PNG_bKGD_SUPPORTED)
|
|
extern PNG_EXPORT(png_uint_32,png_get_bKGD) PNGARG((png_structp png_ptr,
|
|
png_infop info_ptr, png_color_16p *background));
|
|
#endif
|
|
|
|
#if defined(PNG_bKGD_SUPPORTED)
|
|
extern PNG_EXPORT(void,png_set_bKGD) PNGARG((png_structp png_ptr,
|
|
png_infop info_ptr, png_color_16p background));
|
|
#endif
|
|
|
|
#if defined(PNG_cHRM_SUPPORTED)
|
|
#ifdef PNG_FLOATING_POINT_SUPPORTED
|
|
extern PNG_EXPORT(png_uint_32,png_get_cHRM) PNGARG((png_structp png_ptr,
|
|
png_infop info_ptr, double *white_x, double *white_y, double *red_x,
|
|
double *red_y, double *green_x, double *green_y, double *blue_x,
|
|
double *blue_y));
|
|
#endif
|
|
#ifdef PNG_FIXED_POINT_SUPPORTED
|
|
extern PNG_EXPORT(png_uint_32,png_get_cHRM_fixed) PNGARG((png_structp png_ptr,
|
|
png_infop info_ptr, png_fixed_point *int_white_x, png_fixed_point
|
|
*int_white_y, png_fixed_point *int_red_x, png_fixed_point *int_red_y,
|
|
png_fixed_point *int_green_x, png_fixed_point *int_green_y, png_fixed_point
|
|
*int_blue_x, png_fixed_point *int_blue_y));
|
|
#endif
|
|
#endif
|
|
|
|
#if defined(PNG_cHRM_SUPPORTED)
|
|
#ifdef PNG_FLOATING_POINT_SUPPORTED
|
|
extern PNG_EXPORT(void,png_set_cHRM) PNGARG((png_structp png_ptr,
|
|
png_infop info_ptr, double white_x, double white_y, double red_x,
|
|
double red_y, double green_x, double green_y, double blue_x, double blue_y));
|
|
#endif
|
|
#ifdef PNG_FIXED_POINT_SUPPORTED
|
|
extern PNG_EXPORT(void,png_set_cHRM_fixed) PNGARG((png_structp png_ptr,
|
|
png_infop info_ptr, png_fixed_point int_white_x, png_fixed_point int_white_y,
|
|
png_fixed_point int_red_x, png_fixed_point int_red_y, png_fixed_point
|
|
int_green_x, png_fixed_point int_green_y, png_fixed_point int_blue_x,
|
|
png_fixed_point int_blue_y));
|
|
#endif
|
|
#endif
|
|
|
|
#if defined(PNG_gAMA_SUPPORTED)
|
|
#ifdef PNG_FLOATING_POINT_SUPPORTED
|
|
extern PNG_EXPORT(png_uint_32,png_get_gAMA) PNGARG((png_structp png_ptr,
|
|
png_infop info_ptr, double *file_gamma));
|
|
#endif
|
|
extern PNG_EXPORT(png_uint_32,png_get_gAMA_fixed) PNGARG((png_structp png_ptr,
|
|
png_infop info_ptr, png_fixed_point *int_file_gamma));
|
|
#endif
|
|
|
|
#if defined(PNG_gAMA_SUPPORTED)
|
|
#ifdef PNG_FLOATING_POINT_SUPPORTED
|
|
extern PNG_EXPORT(void,png_set_gAMA) PNGARG((png_structp png_ptr,
|
|
png_infop info_ptr, double file_gamma));
|
|
#endif
|
|
extern PNG_EXPORT(void,png_set_gAMA_fixed) PNGARG((png_structp png_ptr,
|
|
png_infop info_ptr, png_fixed_point int_file_gamma));
|
|
#endif
|
|
|
|
#if defined(PNG_hIST_SUPPORTED)
|
|
extern PNG_EXPORT(png_uint_32,png_get_hIST) PNGARG((png_structp png_ptr,
|
|
png_infop info_ptr, png_uint_16p *hist));
|
|
#endif
|
|
|
|
#if defined(PNG_hIST_SUPPORTED)
|
|
extern PNG_EXPORT(void,png_set_hIST) PNGARG((png_structp png_ptr,
|
|
png_infop info_ptr, png_uint_16p hist));
|
|
#endif
|
|
|
|
extern PNG_EXPORT(png_uint_32,png_get_IHDR) PNGARG((png_structp png_ptr,
|
|
png_infop info_ptr, png_uint_32 *width, png_uint_32 *height,
|
|
int *bit_depth, int *color_type, int *interlace_method,
|
|
int *compression_method, int *filter_method));
|
|
|
|
extern PNG_EXPORT(void,png_set_IHDR) PNGARG((png_structp png_ptr,
|
|
png_infop info_ptr, png_uint_32 width, png_uint_32 height, int bit_depth,
|
|
int color_type, int interlace_method, int compression_method,
|
|
int filter_method));
|
|
|
|
#if defined(PNG_oFFs_SUPPORTED)
|
|
extern PNG_EXPORT(png_uint_32,png_get_oFFs) PNGARG((png_structp png_ptr,
|
|
png_infop info_ptr, png_int_32 *offset_x, png_int_32 *offset_y,
|
|
int *unit_type));
|
|
#endif
|
|
|
|
#if defined(PNG_oFFs_SUPPORTED)
|
|
extern PNG_EXPORT(void,png_set_oFFs) PNGARG((png_structp png_ptr,
|
|
png_infop info_ptr, png_int_32 offset_x, png_int_32 offset_y,
|
|
int unit_type));
|
|
#endif
|
|
|
|
#if defined(PNG_pCAL_SUPPORTED)
|
|
extern PNG_EXPORT(png_uint_32,png_get_pCAL) PNGARG((png_structp png_ptr,
|
|
png_infop info_ptr, png_charp *purpose, png_int_32 *X0, png_int_32 *X1,
|
|
int *type, int *nparams, png_charp *units, png_charpp *params));
|
|
#endif
|
|
|
|
#if defined(PNG_pCAL_SUPPORTED)
|
|
extern PNG_EXPORT(void,png_set_pCAL) PNGARG((png_structp png_ptr,
|
|
png_infop info_ptr, png_charp purpose, png_int_32 X0, png_int_32 X1,
|
|
int type, int nparams, png_charp units, png_charpp params));
|
|
#endif
|
|
|
|
#if defined(PNG_pHYs_SUPPORTED)
|
|
extern PNG_EXPORT(png_uint_32,png_get_pHYs) PNGARG((png_structp png_ptr,
|
|
png_infop info_ptr, png_uint_32 *res_x, png_uint_32 *res_y, int *unit_type));
|
|
#endif
|
|
|
|
#if defined(PNG_pHYs_SUPPORTED)
|
|
extern PNG_EXPORT(void,png_set_pHYs) PNGARG((png_structp png_ptr,
|
|
png_infop info_ptr, png_uint_32 res_x, png_uint_32 res_y, int unit_type));
|
|
#endif
|
|
|
|
extern PNG_EXPORT(png_uint_32,png_get_PLTE) PNGARG((png_structp png_ptr,
|
|
png_infop info_ptr, png_colorp *palette, int *num_palette));
|
|
|
|
extern PNG_EXPORT(void,png_set_PLTE) PNGARG((png_structp png_ptr,
|
|
png_infop info_ptr, png_colorp palette, int num_palette));
|
|
|
|
#if defined(PNG_sBIT_SUPPORTED)
|
|
extern PNG_EXPORT(png_uint_32,png_get_sBIT) PNGARG((png_structp png_ptr,
|
|
png_infop info_ptr, png_color_8p *sig_bit));
|
|
#endif
|
|
|
|
#if defined(PNG_sBIT_SUPPORTED)
|
|
extern PNG_EXPORT(void,png_set_sBIT) PNGARG((png_structp png_ptr,
|
|
png_infop info_ptr, png_color_8p sig_bit));
|
|
#endif
|
|
|
|
#if defined(PNG_sRGB_SUPPORTED)
|
|
extern PNG_EXPORT(png_uint_32,png_get_sRGB) PNGARG((png_structp png_ptr,
|
|
png_infop info_ptr, int *intent));
|
|
#endif
|
|
|
|
#if defined(PNG_sRGB_SUPPORTED)
|
|
extern PNG_EXPORT(void,png_set_sRGB) PNGARG((png_structp png_ptr,
|
|
png_infop info_ptr, int intent));
|
|
extern PNG_EXPORT(void,png_set_sRGB_gAMA_and_cHRM) PNGARG((png_structp png_ptr,
|
|
png_infop info_ptr, int intent));
|
|
#endif
|
|
|
|
#if defined(PNG_iCCP_SUPPORTED)
|
|
extern PNG_EXPORT(png_uint_32,png_get_iCCP) PNGARG((png_structp png_ptr,
|
|
png_infop info_ptr, png_charpp name, int *compression_type,
|
|
png_charpp profile, png_uint_32 *proflen));
|
|
/* Note to maintainer: profile should be png_bytepp */
|
|
#endif
|
|
|
|
#if defined(PNG_iCCP_SUPPORTED)
|
|
extern PNG_EXPORT(void,png_set_iCCP) PNGARG((png_structp png_ptr,
|
|
png_infop info_ptr, png_charp name, int compression_type,
|
|
png_charp profile, png_uint_32 proflen));
|
|
/* Note to maintainer: profile should be png_bytep */
|
|
#endif
|
|
|
|
#if defined(PNG_sPLT_SUPPORTED)
|
|
extern PNG_EXPORT(png_uint_32,png_get_sPLT) PNGARG((png_structp png_ptr,
|
|
png_infop info_ptr, png_sPLT_tpp entries));
|
|
#endif
|
|
|
|
#if defined(PNG_sPLT_SUPPORTED)
|
|
extern PNG_EXPORT(void,png_set_sPLT) PNGARG((png_structp png_ptr,
|
|
png_infop info_ptr, png_sPLT_tp entries, int nentries));
|
|
#endif
|
|
|
|
#if defined(PNG_TEXT_SUPPORTED)
|
|
/* png_get_text also returns the number of text chunks in *num_text */
|
|
extern PNG_EXPORT(png_uint_32,png_get_text) PNGARG((png_structp png_ptr,
|
|
png_infop info_ptr, png_textp *text_ptr, int *num_text));
|
|
#endif
|
|
|
|
/*
|
|
* Note while png_set_text() will accept a structure whose text,
|
|
* language, and translated keywords are NULL pointers, the structure
|
|
* returned by png_get_text will always contain regular
|
|
* zero-terminated C strings. They might be empty strings but
|
|
* they will never be NULL pointers.
|
|
*/
|
|
|
|
#if defined(PNG_TEXT_SUPPORTED)
|
|
extern PNG_EXPORT(void,png_set_text) PNGARG((png_structp png_ptr,
|
|
png_infop info_ptr, png_textp text_ptr, int num_text));
|
|
#endif
|
|
|
|
#if defined(PNG_tIME_SUPPORTED)
|
|
extern PNG_EXPORT(png_uint_32,png_get_tIME) PNGARG((png_structp png_ptr,
|
|
png_infop info_ptr, png_timep *mod_time));
|
|
#endif
|
|
|
|
#if defined(PNG_tIME_SUPPORTED)
|
|
extern PNG_EXPORT(void,png_set_tIME) PNGARG((png_structp png_ptr,
|
|
png_infop info_ptr, png_timep mod_time));
|
|
#endif
|
|
|
|
#if defined(PNG_tRNS_SUPPORTED)
|
|
extern PNG_EXPORT(png_uint_32,png_get_tRNS) PNGARG((png_structp png_ptr,
|
|
png_infop info_ptr, png_bytep *trans, int *num_trans,
|
|
png_color_16p *trans_values));
|
|
#endif
|
|
|
|
#if defined(PNG_tRNS_SUPPORTED)
|
|
extern PNG_EXPORT(void,png_set_tRNS) PNGARG((png_structp png_ptr,
|
|
png_infop info_ptr, png_bytep trans, int num_trans,
|
|
png_color_16p trans_values));
|
|
#endif
|
|
|
|
#if defined(PNG_tRNS_SUPPORTED)
|
|
#endif
|
|
|
|
#if defined(PNG_sCAL_SUPPORTED)
|
|
#ifdef PNG_FLOATING_POINT_SUPPORTED
|
|
extern PNG_EXPORT(png_uint_32,png_get_sCAL) PNGARG((png_structp png_ptr,
|
|
png_infop info_ptr, int *unit, double *width, double *height));
|
|
#else
|
|
#ifdef PNG_FIXED_POINT_SUPPORTED
|
|
extern PNG_EXPORT(png_uint_32,png_get_sCAL_s) PNGARG((png_structp png_ptr,
|
|
png_infop info_ptr, int *unit, png_charpp swidth, png_charpp sheight));
|
|
#endif
|
|
#endif
|
|
#endif /* PNG_sCAL_SUPPORTED */
|
|
|
|
#if defined(PNG_sCAL_SUPPORTED)
|
|
#ifdef PNG_FLOATING_POINT_SUPPORTED
|
|
extern PNG_EXPORT(void,png_set_sCAL) PNGARG((png_structp png_ptr,
|
|
png_infop info_ptr, int unit, double width, double height));
|
|
#else
|
|
#ifdef PNG_FIXED_POINT_SUPPORTED
|
|
extern PNG_EXPORT(void,png_set_sCAL_s) PNGARG((png_structp png_ptr,
|
|
png_infop info_ptr, int unit, png_charp swidth, png_charp sheight));
|
|
#endif
|
|
#endif
|
|
#endif /* PNG_sCAL_SUPPORTED || PNG_WRITE_sCAL_SUPPORTED */
|
|
|
|
#if defined(PNG_UNKNOWN_CHUNKS_SUPPORTED)
|
|
/* provide a list of chunks and how they are to be handled, if the built-in
|
|
handling or default unknown chunk handling is not desired. Any chunks not
|
|
listed will be handled in the default manner. The IHDR and IEND chunks
|
|
must not be listed.
|
|
keep = 0: follow default behaviour
|
|
= 1: do not keep
|
|
= 2: keep only if safe-to-copy
|
|
= 3: keep even if unsafe-to-copy
|
|
*/
|
|
extern PNG_EXPORT(void, png_set_keep_unknown_chunks) PNGARG((png_structp
|
|
png_ptr, int keep, png_bytep chunk_list, int num_chunks));
|
|
extern PNG_EXPORT(void, png_set_unknown_chunks) PNGARG((png_structp png_ptr,
|
|
png_infop info_ptr, png_unknown_chunkp unknowns, int num_unknowns));
|
|
extern PNG_EXPORT(void, png_set_unknown_chunk_location)
|
|
PNGARG((png_structp png_ptr, png_infop info_ptr, int chunk, int location));
|
|
extern PNG_EXPORT(png_uint_32,png_get_unknown_chunks) PNGARG((png_structp
|
|
png_ptr, png_infop info_ptr, png_unknown_chunkpp entries));
|
|
#endif
|
|
#ifdef PNG_HANDLE_AS_UNKNOWN_SUPPORTED
|
|
PNG_EXPORT(int,png_handle_as_unknown) PNGARG((png_structp png_ptr, png_bytep
|
|
chunk_name));
|
|
#endif
|
|
|
|
/* Png_free_data() will turn off the "valid" flag for anything it frees.
|
|
If you need to turn it off for a chunk that your application has freed,
|
|
you can use png_set_invalid(png_ptr, info_ptr, PNG_INFO_CHNK); */
|
|
extern PNG_EXPORT(void, png_set_invalid) PNGARG((png_structp png_ptr,
|
|
png_infop info_ptr, int mask));
|
|
|
|
#if defined(PNG_INFO_IMAGE_SUPPORTED)
|
|
/* The "params" pointer is currently not used and is for future expansion. */
|
|
extern PNG_EXPORT(void, png_read_png) PNGARG((png_structp png_ptr,
|
|
png_infop info_ptr,
|
|
int transforms,
|
|
png_voidp params));
|
|
extern PNG_EXPORT(void, png_write_png) PNGARG((png_structp png_ptr,
|
|
png_infop info_ptr,
|
|
int transforms,
|
|
png_voidp params));
|
|
#endif
|
|
|
|
/* Define PNG_DEBUG at compile time for debugging information. Higher
|
|
* numbers for PNG_DEBUG mean more debugging information. This has
|
|
* only been added since version 0.95 so it is not implemented throughout
|
|
* libpng yet, but more support will be added as needed.
|
|
*/
|
|
#ifdef PNG_DEBUG
|
|
#if (PNG_DEBUG > 0)
|
|
#if !defined(PNG_DEBUG_FILE) && defined(_MSC_VER)
|
|
#include <crtdbg.h>
|
|
#if (PNG_DEBUG > 1)
|
|
#ifndef _DEBUG
|
|
# define _DEBUG
|
|
#endif
|
|
#ifndef png_debug
|
|
#define png_debug(l,m) _RPT0(_CRT_WARN,m PNG_STRING_NEWLINE)
|
|
#endif
|
|
#ifndef png_debug1
|
|
#define png_debug1(l,m,p1) _RPT1(_CRT_WARN,m PNG_STRING_NEWLINE,p1)
|
|
#endif
|
|
#ifndef png_debug2
|
|
#define png_debug2(l,m,p1,p2) _RPT2(_CRT_WARN,m PNG_STRING_NEWLINE,p1,p2)
|
|
#endif
|
|
#endif
|
|
#else /* PNG_DEBUG_FILE || !_MSC_VER */
|
|
#ifndef PNG_DEBUG_FILE
|
|
#define PNG_DEBUG_FILE stderr
|
|
#endif /* PNG_DEBUG_FILE */
|
|
#if (PNG_DEBUG > 1)
|
|
#ifndef png_debug
|
|
/* Note: ["%s"m PNG_STRING_NEWLINE] probably does not work on
|
|
* non-ISO compilers */
|
|
#ifdef __STDC__
|
|
#define png_debug(l,m) \
|
|
{ \
|
|
int num_tabs=l; \
|
|
fprintf(PNG_DEBUG_FILE,"%s"m PNG_STRING_NEWLINE,(num_tabs==1 ? "\t" : \
|
|
(num_tabs==2 ? "\t\t":(num_tabs>2 ? "\t\t\t":"")))); \
|
|
}
|
|
#endif
|
|
#ifndef png_debug1
|
|
#define png_debug1(l,m,p1) \
|
|
{ \
|
|
int num_tabs=l; \
|
|
fprintf(PNG_DEBUG_FILE,"%s"m PNG_STRING_NEWLINE,(num_tabs==1 ? "\t" : \
|
|
(num_tabs==2 ? "\t\t":(num_tabs>2 ? "\t\t\t":""))),p1); \
|
|
}
|
|
#endif
|
|
#ifndef png_debug2
|
|
#define png_debug2(l,m,p1,p2) \
|
|
{ \
|
|
int num_tabs=l; \
|
|
fprintf(PNG_DEBUG_FILE,"%s"m PNG_STRING_NEWLINE,(num_tabs==1 ? "\t" : \
|
|
(num_tabs==2 ? "\t\t":(num_tabs>2 ? "\t\t\t":""))),p1,p2); \
|
|
}
|
|
#endif
|
|
#else /* __STDC __ */
|
|
#ifndef png_debug
|
|
#define png_debug(l,m) \
|
|
int num_tabs=l; \
|
|
char format[256]; \
|
|
snprintf(format,256,"%s%s%s",(num_tabs==1 ? "\t" : \
|
|
(num_tabs==2 ? "\t\t":(num_tabs>2 ? "\t\t\t":""))), \
|
|
m,PNG_STRING_NEWLINE); \
|
|
fprintf(PNG_DEBUG_FILE,format);
|
|
#endif
|
|
#ifndef png_debug1
|
|
#define png_debug1(l,m,p1) \
|
|
int num_tabs=l; \
|
|
char format[256]; \
|
|
snprintf(format,256,"%s%s%s",(num_tabs==1 ? "\t" : \
|
|
(num_tabs==2 ? "\t\t":(num_tabs>2 ? "\t\t\t":""))), \
|
|
m,PNG_STRING_NEWLINE); \
|
|
fprintf(PNG_DEBUG_FILE,format,p1);
|
|
#endif
|
|
#ifndef png_debug2
|
|
#define png_debug2(l,m,p1,p2) \
|
|
int num_tabs=l; \
|
|
char format[256]; \
|
|
snprintf(format,256,"%s%s%s",(num_tabs==1 ? "\t" : \
|
|
(num_tabs==2 ? "\t\t":(num_tabs>2 ? "\t\t\t":""))), \
|
|
m,PNG_STRING_NEWLINE); \
|
|
fprintf(PNG_DEBUG_FILE,format,p1,p2);
|
|
#endif
|
|
#endif /* __STDC __ */
|
|
#endif /* (PNG_DEBUG > 1) */
|
|
#endif /* _MSC_VER */
|
|
#endif /* (PNG_DEBUG > 0) */
|
|
#endif /* PNG_DEBUG */
|
|
#ifndef png_debug
|
|
#define png_debug(l, m)
|
|
#endif
|
|
#ifndef png_debug1
|
|
#define png_debug1(l, m, p1)
|
|
#endif
|
|
#ifndef png_debug2
|
|
#define png_debug2(l, m, p1, p2)
|
|
#endif
|
|
|
|
#if 0
|
|
extern PNG_EXPORT(png_bytep,png_sig_bytes) PNGARG((void));
|
|
#endif
|
|
|
|
extern PNG_EXPORT(png_charp,png_get_copyright) PNGARG((png_structp png_ptr));
|
|
extern PNG_EXPORT(png_charp,png_get_header_ver) PNGARG((png_structp png_ptr));
|
|
extern PNG_EXPORT(png_charp,png_get_header_version) PNGARG((png_structp png_ptr));
|
|
extern PNG_EXPORT(png_charp,png_get_libpng_ver) PNGARG((png_structp png_ptr));
|
|
|
|
#ifdef PNG_MNG_FEATURES_SUPPORTED
|
|
extern PNG_EXPORT(png_uint_32,png_permit_mng_features) PNGARG((png_structp
|
|
png_ptr, png_uint_32 mng_features_permitted));
|
|
#endif
|
|
|
|
/* For use in png_set_keep_unknown, added to version 1.2.6 */
|
|
#define PNG_HANDLE_CHUNK_AS_DEFAULT 0
|
|
#define PNG_HANDLE_CHUNK_NEVER 1
|
|
#define PNG_HANDLE_CHUNK_IF_SAFE 2
|
|
#define PNG_HANDLE_CHUNK_ALWAYS 3
|
|
|
|
/* Strip the prepended error numbers ("#nnn ") from error and warning
|
|
* messages before passing them to the error or warning handler. */
|
|
#ifdef PNG_ERROR_NUMBERS_SUPPORTED
|
|
extern PNG_EXPORT(void,png_set_strip_error_numbers) PNGARG((png_structp
|
|
png_ptr, png_uint_32 strip_mode));
|
|
#endif
|
|
|
|
|
|
/* Added in libpng-1.2.6 */
|
|
#ifdef PNG_SET_USER_LIMITS_SUPPORTED
|
|
extern PNG_EXPORT(void,png_set_user_limits) PNGARG((png_structp
|
|
png_ptr, png_uint_32 user_width_max, png_uint_32 user_height_max));
|
|
extern PNG_EXPORT(png_uint_32,png_get_user_width_max) PNGARG((png_structp
|
|
png_ptr));
|
|
extern PNG_EXPORT(png_uint_32,png_get_user_height_max) PNGARG((png_structp
|
|
png_ptr));
|
|
/* Added in libpng-1.4.0 */
|
|
extern PNG_EXPORT(void,png_set_chunk_cache_max) PNGARG((png_structp
|
|
png_ptr, png_uint_32 user_chunk_cache_max));
|
|
extern PNG_EXPORT(png_uint_32,png_get_chunk_cache_max)
|
|
PNGARG((png_structp png_ptr));
|
|
#endif
|
|
|
|
#if defined(PNG_INCH_CONVERSIONS) && defined(PNG_FLOATING_POINT_SUPPORTED)
|
|
PNG_EXPORT(png_uint_32,png_get_pixels_per_inch) PNGARG((png_structp png_ptr,
|
|
png_infop info_ptr));
|
|
|
|
PNG_EXPORT(png_uint_32,png_get_x_pixels_per_inch) PNGARG((png_structp png_ptr,
|
|
png_infop info_ptr));
|
|
|
|
PNG_EXPORT(png_uint_32,png_get_y_pixels_per_inch) PNGARG((png_structp png_ptr,
|
|
png_infop info_ptr));
|
|
|
|
PNG_EXPORT(float,png_get_x_offset_inches) PNGARG((png_structp png_ptr,
|
|
png_infop info_ptr));
|
|
|
|
PNG_EXPORT(float,png_get_y_offset_inches) PNGARG((png_structp png_ptr,
|
|
png_infop info_ptr));
|
|
|
|
#if defined(PNG_pHYs_SUPPORTED)
|
|
PNG_EXPORT(png_uint_32,png_get_pHYs_dpi) PNGARG((png_structp png_ptr,
|
|
png_infop info_ptr, png_uint_32 *res_x, png_uint_32 *res_y, int *unit_type));
|
|
#endif /* PNG_pHYs_SUPPORTED */
|
|
#endif /* PNG_INCH_CONVERSIONS && PNG_FLOATING_POINT_SUPPORTED */
|
|
|
|
/* Added in libpng-1.4.0 */
|
|
#ifdef PNG_IO_STATE_SUPPORTED
|
|
extern PNG_EXPORT(png_uint_32,png_get_io_state) PNGARG((png_structp png_ptr));
|
|
|
|
extern PNG_EXPORT(png_bytep,png_get_io_chunk_name)
|
|
PNGARG((png_structp png_ptr));
|
|
|
|
/* The flags returned by png_get_io_state() are the following: */
|
|
#define PNG_IO_NONE 0x0000 /* no I/O at this moment */
|
|
#define PNG_IO_READING 0x0001 /* currently reading */
|
|
#define PNG_IO_WRITING 0x0002 /* currently writing */
|
|
#define PNG_IO_SIGNATURE 0x0010 /* currently at the file signature */
|
|
#define PNG_IO_CHUNK_HDR 0x0020 /* currently at the chunk header */
|
|
#define PNG_IO_CHUNK_DATA 0x0040 /* currently at the chunk data */
|
|
#define PNG_IO_CHUNK_CRC 0x0080 /* currently at the chunk crc */
|
|
#define PNG_IO_MASK_OP 0x000f /* current operation: reading/writing */
|
|
#define PNG_IO_MASK_LOC 0x00f0 /* current location: sig/hdr/data/crc */
|
|
#endif /* ?PNG_IO_STATE_SUPPORTED */
|
|
|
|
/* Maintainer: Put new public prototypes here ^, in libpng.3, and project defs */
|
|
|
|
#ifdef PNG_READ_COMPOSITE_NODIV_SUPPORTED
|
|
/* With these routines we avoid an integer divide, which will be slower on
|
|
* most machines. However, it does take more operations than the corresponding
|
|
* divide method, so it may be slower on a few RISC systems. There are two
|
|
* shifts (by 8 or 16 bits) and an addition, versus a single integer divide.
|
|
*
|
|
* Note that the rounding factors are NOT supposed to be the same! 128 and
|
|
* 32768 are correct for the NODIV code; 127 and 32767 are correct for the
|
|
* standard method.
|
|
*
|
|
* [Optimized code by Greg Roelofs and Mark Adler...blame us for bugs. :-) ]
|
|
*/
|
|
|
|
/* fg and bg should be in `gamma 1.0' space; alpha is the opacity */
|
|
|
|
# define png_composite(composite, fg, alpha, bg) \
|
|
{ png_uint_16 temp = (png_uint_16)((png_uint_16)(fg) * (png_uint_16)(alpha) \
|
|
+ (png_uint_16)(bg)*(png_uint_16)(255 - \
|
|
(png_uint_16)(alpha)) + (png_uint_16)128); \
|
|
(composite) = (png_byte)((temp + (temp >> 8)) >> 8); }
|
|
|
|
# define png_composite_16(composite, fg, alpha, bg) \
|
|
{ png_uint_32 temp = (png_uint_32)((png_uint_32)(fg) * (png_uint_32)(alpha) \
|
|
+ (png_uint_32)(bg)*(png_uint_32)(65535L - \
|
|
(png_uint_32)(alpha)) + (png_uint_32)32768L); \
|
|
(composite) = (png_uint_16)((temp + (temp >> 16)) >> 16); }
|
|
|
|
#else /* standard method using integer division */
|
|
|
|
# define png_composite(composite, fg, alpha, bg) \
|
|
(composite) = (png_byte)(((png_uint_16)(fg) * (png_uint_16)(alpha) + \
|
|
(png_uint_16)(bg) * (png_uint_16)(255 - (png_uint_16)(alpha)) + \
|
|
(png_uint_16)127) / 255)
|
|
|
|
# define png_composite_16(composite, fg, alpha, bg) \
|
|
(composite) = (png_uint_16)(((png_uint_32)(fg) * (png_uint_32)(alpha) + \
|
|
(png_uint_32)(bg)*(png_uint_32)(65535L - (png_uint_32)(alpha)) + \
|
|
(png_uint_32)32767) / (png_uint_32)65535L)
|
|
|
|
#endif /* PNG_READ_COMPOSITE_NODIV_SUPPORTED */
|
|
|
|
#ifdef PNG_USE_READ_MACROS
|
|
/* Inline macros to do direct reads of bytes from the input buffer.
|
|
* The png_get_int_32() routine assumes we are using two's complement
|
|
* format for negative values, which is almost certainly true.
|
|
*/
|
|
/* We could make special-case BIG_ENDIAN macros that do direct reads here */
|
|
# define png_get_uint_32(buf) \
|
|
(((png_uint_32)(*(buf)) << 24) + \
|
|
((png_uint_32)(*((buf) + 1)) << 16) + \
|
|
((png_uint_32)(*((buf) + 2)) << 8) + \
|
|
((png_uint_32)(*((buf) + 3))))
|
|
# define png_get_uint_16(buf) \
|
|
(((png_uint_32)(*(buf)) << 8) + \
|
|
((png_uint_32)(*((buf) + 1))))
|
|
#if defined(PNG_GET_INT_32_SUPPORTED)
|
|
# define png_get_int_32(buf) \
|
|
(((png_int_32)(*(buf)) << 24) + \
|
|
((png_int_32)(*((buf) + 1)) << 16) + \
|
|
((png_int_32)(*((buf) + 2)) << 8) + \
|
|
((png_int_32)(*((buf) + 3))))
|
|
#endif
|
|
#else
|
|
extern PNG_EXPORT(png_uint_32,png_get_uint_32) PNGARG((png_bytep buf));
|
|
extern PNG_EXPORT(png_uint_16,png_get_uint_16) PNGARG((png_bytep buf));
|
|
#if defined(PNG_GET_INT_32_SUPPORTED)
|
|
extern PNG_EXPORT(png_int_32,png_get_int_32) PNGARG((png_bytep buf));
|
|
#endif
|
|
#endif
|
|
extern PNG_EXPORT(png_uint_32,png_get_uint_31)
|
|
PNGARG((png_structp png_ptr, png_bytep buf));
|
|
/* No png_get_int_16 -- may be added if there's a real need for it. */
|
|
|
|
/* Place a 32-bit number into a buffer in PNG byte order (big-endian).
|
|
*/
|
|
extern PNG_EXPORT(void,png_save_uint_32)
|
|
PNGARG((png_bytep buf, png_uint_32 i));
|
|
extern PNG_EXPORT(void,png_save_int_32)
|
|
PNGARG((png_bytep buf, png_int_32 i));
|
|
|
|
/* Place a 16-bit number into a buffer in PNG byte order.
|
|
* The parameter is declared unsigned int, not png_uint_16,
|
|
* just to avoid potential problems on pre-ANSI C compilers.
|
|
*/
|
|
extern PNG_EXPORT(void,png_save_uint_16)
|
|
PNGARG((png_bytep buf, unsigned int i));
|
|
/* No png_save_int_16 -- may be added if there's a real need for it. */
|
|
|
|
/* ************************************************************************* */
|
|
|
|
/* Various modes of operation. Note that after an init, mode is set to
|
|
* zero automatically when the structure is created.
|
|
*/
|
|
#define PNG_HAVE_IHDR 0x01
|
|
#define PNG_HAVE_PLTE 0x02
|
|
#define PNG_HAVE_IDAT 0x04
|
|
#define PNG_AFTER_IDAT 0x08 /* Have complete zlib datastream */
|
|
#define PNG_HAVE_IEND 0x10
|
|
#define PNG_HAVE_gAMA 0x20
|
|
#define PNG_HAVE_cHRM 0x40
|
|
|
|
#ifdef __cplusplus
|
|
}
|
|
#endif
|
|
|
|
#endif /* PNG_VERSION_INFO_ONLY */
|
|
/* do not put anything past this line */
|
|
#endif /* PNG_H */
|