author | prr |
Sat, 09 Dec 2017 11:40:40 -0800 | |
changeset 48280 | 791d551bcdb8 |
parent 47216 | 71c04702a3d5 |
child 51304 | 66d9993dd4ad |
permissions | -rw-r--r-- |
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/* |
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
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* |
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* This code is free software; you can redistribute it and/or modify it |
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* under the terms of the GNU General Public License version 2 only, as |
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* published by the Free Software Foundation. Oracle designates this |
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* particular file as subject to the "Classpath" exception as provided |
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* by Oracle in the LICENSE file that accompanied this code. |
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* |
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* This code is distributed in the hope that it will be useful, but WITHOUT |
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
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* version 2 for more details (a copy is included in the LICENSE file that |
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* accompanied this code). |
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* |
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* You should have received a copy of the GNU General Public License version |
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* 2 along with this work; if not, write to the Free Software Foundation, |
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
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* |
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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* or visit www.oracle.com if you need additional information or have any |
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* questions. |
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*/ |
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/* png.h - header file for PNG reference library |
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* |
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* This file is available under and governed by the GNU General Public |
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* License version 2 only, as published by the Free Software Foundation. |
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* However, the following notice accompanied the original version of this |
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* file and, per its terms, should not be removed: |
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* |
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* libpng version 1.6.34, September 29, 2017 |
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* |
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* Copyright (c) 1998-2002,2004,2006-2017 Glenn Randers-Pehrson |
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* (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger) |
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* (Version 0.88 Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.) |
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* |
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* This code is released under the libpng license (See LICENSE, below) |
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* |
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* Authors and maintainers: |
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* libpng versions 0.71, May 1995, through 0.88, January 1996: Guy Schalnat |
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* libpng versions 0.89, June 1996, through 0.96, May 1997: Andreas Dilger |
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* libpng versions 0.97, January 1998, through 1.6.34, September 29, 2017: |
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* Glenn Randers-Pehrson. |
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* See also "Contributing Authors", below. |
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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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* This code is released under the libpng license. |
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* |
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* libpng versions 1.0.7, July 1, 2000 through 1.6.34, September 29, 2017 are |
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* Copyright (c) 2000-2002, 2004, 2006-2017 Glenn Randers-Pehrson, are |
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* derived from libpng-1.0.6, and are distributed according to the same |
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* disclaimer and license as libpng-1.0.6 with the following individuals |
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* 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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* Mans Rullgard |
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* Cosmin Truta |
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* Gilles Vollant |
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* James Yu |
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* Mandar Sahastrabuddhe |
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* Google Inc. |
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* Vadim Barkov |
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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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* Some files in the "contrib" directory and some configure-generated |
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* files that are distributed with libpng have other copyright owners and |
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* are released under other open source licenses. |
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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) 1998-2000 Glenn Randers-Pehrson, are derived from |
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* libpng-0.96, and are distributed according to the same disclaimer and |
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* license as libpng-0.96, with the following individuals added to the list |
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* 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, are derived from libpng-0.88, |
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* and are distributed according to the same disclaimer and license as |
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* libpng-0.88, with the following individuals added to the list of |
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* 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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* Some files in the "scripts" directory have other copyright owners |
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* but are released under this license. |
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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 must not |
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* 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 any |
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* 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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* END OF COPYRIGHT NOTICE, DISCLAIMER, and LICENSE. |
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* |
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* TRADEMARK: |
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* |
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* The name "libpng" has not been registered by the Copyright owner |
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* as a trademark in any jurisdiction. However, because libpng has |
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* been distributed and maintained world-wide, continually since 1995, |
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* the Copyright owner claims "common-law trademark protection" in any |
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* jurisdiction where common-law trademark is recognized. |
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* |
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* OSI CERTIFICATION: |
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* |
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* Libpng is OSI Certified Open Source Software. OSI Certified Open Source is |
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* a certification mark of the Open Source Initiative. OSI has not addressed |
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* the additional disclaimers inserted at version 1.0.7. |
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* |
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* EXPORT CONTROL: |
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* |
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* The Copyright owner believes that the Export Control Classification |
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* Number (ECCN) for libpng is EAR99, which means not subject to export |
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* controls or International Traffic in Arms Regulations (ITAR) because |
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* it is open source, publicly available software, that does not contain |
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* any encryption software. See the EAR, paragraphs 734.3(b)(3) and |
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* 734.7(b). |
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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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* 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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/* 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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* ... |
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* 1.0.19 10 10019 10.so.0.19[.0] |
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* ... |
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* 1.2.59 13 10257 12.so.0.59[.0] |
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* ... |
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* 1.5.30 15 10527 15.so.15.30[.0] |
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* ... |
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* 1.6.34 16 10633 16.so.16.34[.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 "rcNN". |
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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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* <https://www.w3.org/TR/2003/REC-PNG-20031110/ |
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*/ |
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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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* September 29, 2017 |
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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 1.6.34 are Y2K compliant. It is my belief that |
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* earlier versions were also Y2K compliant. |
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* |
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* Libpng only has two year fields. One is a 2-byte unsigned integer |
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* that will hold years up to 65535. The other, which is deprecated, |
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* holds the date in text 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 string is |
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* "char time_buffer[29]" in png_struct. This is no longer used |
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* in libpng-1.6.x and will be removed from libpng-1.7.0. |
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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_buffer() in png.c |
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* (formerly png_convert_to_rfc_1123() prior to libpng-1.5.x and |
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* png_convert_to_rfc_1152() in error prior to libpng-0.98) |
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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 libpng applications |
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* are not passing 4-digit years into the png_convert_to_rfc_1123_buffer() |
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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 |
|
326 |
#define PNG_H |
|
327 |
||
10576 | 328 |
/* This is not the place to learn how to use libpng. The file libpng-manual.txt |
2 | 329 |
* describes how to use libpng, and the file example.c summarizes it |
330 |
* with some code on which to build. This file is useful for looking |
|
29913 | 331 |
* at the actual function definitions and structure components. If that |
332 |
* file has been stripped from your copy of libpng, you can find it at |
|
333 |
* <http://www.libpng.org/pub/png/libpng-manual.txt> |
|
334 |
* |
|
335 |
* If you just need to read a PNG file and don't want to read the documentation |
|
336 |
* skip to the end of this file and read the section entitled 'simplified API'. |
|
2 | 337 |
*/ |
338 |
||
339 |
/* Version information for png.h - this should match the version in png.c */ |
|
48280 | 340 |
#define PNG_LIBPNG_VER_STRING "1.6.34" |
341 |
#define PNG_HEADER_VERSION_STRING " libpng version 1.6.34 - September 29, 2017\n" |
|
29913 | 342 |
|
343 |
#define PNG_LIBPNG_VER_SONUM 16 |
|
344 |
#define PNG_LIBPNG_VER_DLLNUM 16 |
|
2 | 345 |
|
346 |
/* These should match the first 3 components of PNG_LIBPNG_VER_STRING: */ |
|
347 |
#define PNG_LIBPNG_VER_MAJOR 1 |
|
29913 | 348 |
#define PNG_LIBPNG_VER_MINOR 6 |
48280 | 349 |
#define PNG_LIBPNG_VER_RELEASE 34 |
29913 | 350 |
|
2 | 351 |
/* This should match the numeric part of the final component of |
10576 | 352 |
* PNG_LIBPNG_VER_STRING, omitting any leading zero: |
353 |
*/ |
|
2 | 354 |
|
355 |
#define PNG_LIBPNG_VER_BUILD 0 |
|
356 |
||
357 |
/* Release Status */ |
|
358 |
#define PNG_LIBPNG_BUILD_ALPHA 1 |
|
359 |
#define PNG_LIBPNG_BUILD_BETA 2 |
|
360 |
#define PNG_LIBPNG_BUILD_RC 3 |
|
361 |
#define PNG_LIBPNG_BUILD_STABLE 4 |
|
362 |
#define PNG_LIBPNG_BUILD_RELEASE_STATUS_MASK 7 |
|
363 |
||
364 |
/* Release-Specific Flags */ |
|
365 |
#define PNG_LIBPNG_BUILD_PATCH 8 /* Can be OR'ed with |
|
366 |
PNG_LIBPNG_BUILD_STABLE only */ |
|
367 |
#define PNG_LIBPNG_BUILD_PRIVATE 16 /* Cannot be OR'ed with |
|
368 |
PNG_LIBPNG_BUILD_SPECIAL */ |
|
369 |
#define PNG_LIBPNG_BUILD_SPECIAL 32 /* Cannot be OR'ed with |
|
370 |
PNG_LIBPNG_BUILD_PRIVATE */ |
|
371 |
||
29913 | 372 |
#define PNG_LIBPNG_BUILD_BASE_TYPE PNG_LIBPNG_BUILD_STABLE |
2 | 373 |
|
374 |
/* Careful here. At one time, Guy wanted to use 082, but that would be octal. |
|
375 |
* We must not include leading zeros. |
|
376 |
* Versions 0.7 through 1.0.0 were in the range 0 to 100 here (only |
|
377 |
* version 1.0.0 was mis-numbered 100 instead of 10000). From |
|
10576 | 378 |
* version 1.0.1 it's xxyyzz, where x=major, y=minor, z=release |
379 |
*/ |
|
48280 | 380 |
#define PNG_LIBPNG_VER 10634 /* 1.6.34 */ |
10576 | 381 |
|
382 |
/* Library configuration: these options cannot be changed after |
|
383 |
* the library has been built. |
|
384 |
*/ |
|
385 |
#ifndef PNGLCONF_H |
|
43321 | 386 |
/* If pnglibconf.h is missing, you can |
387 |
* copy scripts/pnglibconf.h.prebuilt to pnglibconf.h |
|
388 |
*/ |
|
10576 | 389 |
# include "pnglibconf.h" |
390 |
#endif |
|
2 | 391 |
|
392 |
#ifndef PNG_VERSION_INFO_ONLY |
|
43321 | 393 |
/* Machine specific configuration. */ |
10576 | 394 |
# include "pngconf.h" |
2 | 395 |
#endif |
396 |
||
397 |
/* |
|
10576 | 398 |
* Added at libpng-1.2.8 |
399 |
* |
|
400 |
* Ref MSDN: Private as priority over Special |
|
2 | 401 |
* VS_FF_PRIVATEBUILD File *was not* built using standard release |
402 |
* procedures. If this value is given, the StringFileInfo block must |
|
403 |
* contain a PrivateBuild string. |
|
404 |
* |
|
405 |
* VS_FF_SPECIALBUILD File *was* built by the original company using |
|
406 |
* standard release procedures but is a variation of the standard |
|
407 |
* file of the same version number. If this value is given, the |
|
408 |
* StringFileInfo block must contain a SpecialBuild string. |
|
409 |
*/ |
|
410 |
||
10576 | 411 |
#ifdef PNG_USER_PRIVATEBUILD /* From pnglibconf.h */ |
2 | 412 |
# define PNG_LIBPNG_BUILD_TYPE \ |
10576 | 413 |
(PNG_LIBPNG_BUILD_BASE_TYPE | PNG_LIBPNG_BUILD_PRIVATE) |
2 | 414 |
#else |
10576 | 415 |
# ifdef PNG_LIBPNG_SPECIALBUILD |
2 | 416 |
# define PNG_LIBPNG_BUILD_TYPE \ |
10576 | 417 |
(PNG_LIBPNG_BUILD_BASE_TYPE | PNG_LIBPNG_BUILD_SPECIAL) |
2 | 418 |
# else |
419 |
# define PNG_LIBPNG_BUILD_TYPE (PNG_LIBPNG_BUILD_BASE_TYPE) |
|
420 |
# endif |
|
421 |
#endif |
|
422 |
||
423 |
#ifndef PNG_VERSION_INFO_ONLY |
|
424 |
||
425 |
/* Inhibit C++ name-mangling for libpng functions but not for system calls. */ |
|
426 |
#ifdef __cplusplus |
|
427 |
extern "C" { |
|
428 |
#endif /* __cplusplus */ |
|
429 |
||
430 |
/* Version information for C files, stored in png.c. This had better match |
|
431 |
* the version above. |
|
432 |
*/ |
|
433 |
#define png_libpng_ver png_get_header_ver(NULL) |
|
434 |
||
10576 | 435 |
/* This file is arranged in several sections: |
436 |
* |
|
35296 | 437 |
* 1. [omitted] |
438 |
* 2. Any configuration options that can be specified by for the application |
|
10576 | 439 |
* code when it is built. (Build time configuration is in pnglibconf.h) |
35296 | 440 |
* 3. Type definitions (base types are defined in pngconf.h), structure |
10576 | 441 |
* definitions. |
35296 | 442 |
* 4. Exported library functions. |
443 |
* 5. Simplified API. |
|
444 |
* 6. Implementation options. |
|
10576 | 445 |
* |
446 |
* The library source code has additional files (principally pngpriv.h) that |
|
447 |
* allow configuration of the library. |
|
448 |
*/ |
|
35296 | 449 |
|
450 |
/* Section 1: [omitted] */ |
|
451 |
||
452 |
/* Section 2: run time configuration |
|
10576 | 453 |
* See pnglibconf.h for build time configuration |
454 |
* |
|
455 |
* Run time configuration allows the application to choose between |
|
456 |
* implementations of certain arithmetic APIs. The default is set |
|
457 |
* at build time and recorded in pnglibconf.h, but it is safe to |
|
458 |
* override these (and only these) settings. Note that this won't |
|
459 |
* change what the library does, only application code, and the |
|
460 |
* settings can (and probably should) be made on a per-file basis |
|
461 |
* by setting the #defines before including png.h |
|
462 |
* |
|
463 |
* Use macros to read integers from PNG data or use the exported |
|
464 |
* functions? |
|
465 |
* PNG_USE_READ_MACROS: use the macros (see below) Note that |
|
466 |
* the macros evaluate their argument multiple times. |
|
467 |
* PNG_NO_USE_READ_MACROS: call the relevant library function. |
|
468 |
* |
|
469 |
* Use the alternative algorithm for compositing alpha samples that |
|
470 |
* does not use division? |
|
471 |
* PNG_READ_COMPOSITE_NODIV_SUPPORTED: use the 'no division' |
|
472 |
* algorithm. |
|
473 |
* PNG_NO_READ_COMPOSITE_NODIV: use the 'division' algorithm. |
|
474 |
* |
|
475 |
* How to handle benign errors if PNG_ALLOW_BENIGN_ERRORS is |
|
476 |
* false? |
|
477 |
* PNG_ALLOW_BENIGN_ERRORS: map calls to the benign error |
|
478 |
* APIs to png_warning. |
|
479 |
* Otherwise the calls are mapped to png_error. |
|
480 |
*/ |
|
2 | 481 |
|
35296 | 482 |
/* Section 3: type definitions, including structures and compile time |
10576 | 483 |
* constants. |
484 |
* See pngconf.h for base types that vary by machine/system |
|
485 |
*/ |
|
486 |
||
487 |
/* This triggers a compiler error in png.c, if png.c and png.h |
|
488 |
* do not agree upon the version number. |
|
489 |
*/ |
|
48280 | 490 |
typedef char* png_libpng_version_1_6_34; |
29913 | 491 |
|
492 |
/* Basic control structions. Read libpng-manual.txt or libpng.3 for more info. |
|
493 |
* |
|
494 |
* png_struct is the cache of information used while reading or writing a single |
|
495 |
* PNG file. One of these is always required, although the simplified API |
|
496 |
* (below) hides the creation and destruction of it. |
|
497 |
*/ |
|
498 |
typedef struct png_struct_def png_struct; |
|
499 |
typedef const png_struct * png_const_structp; |
|
500 |
typedef png_struct * png_structp; |
|
501 |
typedef png_struct * * png_structpp; |
|
502 |
||
503 |
/* png_info contains information read from or to be written to a PNG file. One |
|
504 |
* or more of these must exist while reading or creating a PNG file. The |
|
505 |
* information is not used by libpng during read but is used to control what |
|
506 |
* gets written when a PNG file is created. "png_get_" function calls read |
|
507 |
* information during read and "png_set_" functions calls write information |
|
508 |
* when creating a PNG. |
|
509 |
* been moved into a separate header file that is not accessible to |
|
510 |
* applications. Read libpng-manual.txt or libpng.3 for more info. |
|
511 |
*/ |
|
512 |
typedef struct png_info_def png_info; |
|
513 |
typedef png_info * png_infop; |
|
514 |
typedef const png_info * png_const_infop; |
|
515 |
typedef png_info * * png_infopp; |
|
516 |
||
517 |
/* Types with names ending 'p' are pointer types. The corresponding types with |
|
518 |
* names ending 'rp' are identical pointer types except that the pointer is |
|
519 |
* marked 'restrict', which means that it is the only pointer to the object |
|
520 |
* passed to the function. Applications should not use the 'restrict' types; |
|
521 |
* it is always valid to pass 'p' to a pointer with a function argument of the |
|
522 |
* corresponding 'rp' type. Different compilers have different rules with |
|
523 |
* regard to type matching in the presence of 'restrict'. For backward |
|
524 |
* compatibility libpng callbacks never have 'restrict' in their parameters and, |
|
525 |
* consequentially, writing portable application code is extremely difficult if |
|
526 |
* an attempt is made to use 'restrict'. |
|
527 |
*/ |
|
528 |
typedef png_struct * PNG_RESTRICT png_structrp; |
|
529 |
typedef const png_struct * PNG_RESTRICT png_const_structrp; |
|
530 |
typedef png_info * PNG_RESTRICT png_inforp; |
|
531 |
typedef const png_info * PNG_RESTRICT png_const_inforp; |
|
2 | 532 |
|
533 |
/* Three color definitions. The order of the red, green, and blue, (and the |
|
534 |
* exact size) is not important, although the size of the fields need to |
|
535 |
* be png_byte or png_uint_16 (as defined below). |
|
536 |
*/ |
|
537 |
typedef struct png_color_struct |
|
538 |
{ |
|
539 |
png_byte red; |
|
540 |
png_byte green; |
|
541 |
png_byte blue; |
|
542 |
} png_color; |
|
29913 | 543 |
typedef png_color * png_colorp; |
544 |
typedef const png_color * png_const_colorp; |
|
545 |
typedef png_color * * png_colorpp; |
|
2 | 546 |
|
547 |
typedef struct png_color_16_struct |
|
548 |
{ |
|
549 |
png_byte index; /* used for palette files */ |
|
550 |
png_uint_16 red; /* for use in red green blue files */ |
|
551 |
png_uint_16 green; |
|
552 |
png_uint_16 blue; |
|
553 |
png_uint_16 gray; /* for use in grayscale files */ |
|
554 |
} png_color_16; |
|
29913 | 555 |
typedef png_color_16 * png_color_16p; |
556 |
typedef const png_color_16 * png_const_color_16p; |
|
557 |
typedef png_color_16 * * png_color_16pp; |
|
2 | 558 |
|
559 |
typedef struct png_color_8_struct |
|
560 |
{ |
|
561 |
png_byte red; /* for use in red green blue files */ |
|
562 |
png_byte green; |
|
563 |
png_byte blue; |
|
564 |
png_byte gray; /* for use in grayscale files */ |
|
565 |
png_byte alpha; /* for alpha channel files */ |
|
566 |
} png_color_8; |
|
29913 | 567 |
typedef png_color_8 * png_color_8p; |
568 |
typedef const png_color_8 * png_const_color_8p; |
|
569 |
typedef png_color_8 * * png_color_8pp; |
|
2 | 570 |
|
571 |
/* |
|
572 |
* The following two structures are used for the in-core representation |
|
573 |
* of sPLT chunks. |
|
574 |
*/ |
|
575 |
typedef struct png_sPLT_entry_struct |
|
576 |
{ |
|
577 |
png_uint_16 red; |
|
578 |
png_uint_16 green; |
|
579 |
png_uint_16 blue; |
|
580 |
png_uint_16 alpha; |
|
581 |
png_uint_16 frequency; |
|
582 |
} png_sPLT_entry; |
|
29913 | 583 |
typedef png_sPLT_entry * png_sPLT_entryp; |
584 |
typedef const png_sPLT_entry * png_const_sPLT_entryp; |
|
585 |
typedef png_sPLT_entry * * png_sPLT_entrypp; |
|
2 | 586 |
|
587 |
/* When the depth of the sPLT palette is 8 bits, the color and alpha samples |
|
588 |
* occupy the LSB of their respective members, and the MSB of each member |
|
589 |
* is zero-filled. The frequency member always occupies the full 16 bits. |
|
590 |
*/ |
|
591 |
||
592 |
typedef struct png_sPLT_struct |
|
593 |
{ |
|
594 |
png_charp name; /* palette name */ |
|
595 |
png_byte depth; /* depth of palette samples */ |
|
596 |
png_sPLT_entryp entries; /* palette entries */ |
|
597 |
png_int_32 nentries; /* number of palette entries */ |
|
598 |
} png_sPLT_t; |
|
29913 | 599 |
typedef png_sPLT_t * png_sPLT_tp; |
600 |
typedef const png_sPLT_t * png_const_sPLT_tp; |
|
601 |
typedef png_sPLT_t * * png_sPLT_tpp; |
|
2 | 602 |
|
603 |
#ifdef PNG_TEXT_SUPPORTED |
|
604 |
/* png_text holds the contents of a text/ztxt/itxt chunk in a PNG file, |
|
605 |
* and whether that contents is compressed or not. The "key" field |
|
29913 | 606 |
* points to a regular zero-terminated C string. The "text" fields can be a |
607 |
* regular C string, an empty string, or a NULL pointer. |
|
10576 | 608 |
* However, the structure returned by png_get_text() will always contain |
29913 | 609 |
* the "text" field as a regular zero-terminated C string (possibly |
610 |
* empty), never a NULL pointer, so it can be safely used in printf() and |
|
611 |
* other string-handling functions. Note that the "itxt_length", "lang", and |
|
612 |
* "lang_key" members of the structure only exist when the library is built |
|
613 |
* with iTXt chunk support. Prior to libpng-1.4.0 the library was built by |
|
614 |
* default without iTXt support. Also note that when iTXt *is* supported, |
|
615 |
* the "lang" and "lang_key" fields contain NULL pointers when the |
|
616 |
* "compression" field contains * PNG_TEXT_COMPRESSION_NONE or |
|
617 |
* PNG_TEXT_COMPRESSION_zTXt. Note that the "compression value" is not the |
|
618 |
* same as what appears in the PNG tEXt/zTXt/iTXt chunk's "compression flag" |
|
619 |
* which is always 0 or 1, or its "compression method" which is always 0. |
|
2 | 620 |
*/ |
621 |
typedef struct png_text_struct |
|
622 |
{ |
|
623 |
int compression; /* compression value: |
|
624 |
-1: tEXt, none |
|
625 |
0: zTXt, deflate |
|
626 |
1: iTXt, none |
|
627 |
2: iTXt, deflate */ |
|
628 |
png_charp key; /* keyword, 1-79 character description of "text" */ |
|
629 |
png_charp text; /* comment, may be an empty string (ie "") |
|
630 |
or a NULL pointer */ |
|
631 |
png_size_t text_length; /* length of the text string */ |
|
632 |
png_size_t itxt_length; /* length of the itxt string */ |
|
633 |
png_charp lang; /* language code, 0-79 characters |
|
634 |
or a NULL pointer */ |
|
635 |
png_charp lang_key; /* keyword translated UTF-8 string, 0 or more |
|
636 |
chars or a NULL pointer */ |
|
637 |
} png_text; |
|
29913 | 638 |
typedef png_text * png_textp; |
639 |
typedef const png_text * png_const_textp; |
|
640 |
typedef png_text * * png_textpp; |
|
2 | 641 |
#endif |
642 |
||
643 |
/* Supported compression types for text in PNG files (tEXt, and zTXt). |
|
644 |
* The values of the PNG_TEXT_COMPRESSION_ defines should NOT be changed. */ |
|
645 |
#define PNG_TEXT_COMPRESSION_NONE_WR -3 |
|
646 |
#define PNG_TEXT_COMPRESSION_zTXt_WR -2 |
|
647 |
#define PNG_TEXT_COMPRESSION_NONE -1 |
|
648 |
#define PNG_TEXT_COMPRESSION_zTXt 0 |
|
649 |
#define PNG_ITXT_COMPRESSION_NONE 1 |
|
650 |
#define PNG_ITXT_COMPRESSION_zTXt 2 |
|
651 |
#define PNG_TEXT_COMPRESSION_LAST 3 /* Not a valid value */ |
|
652 |
||
653 |
/* png_time is a way to hold the time in an machine independent way. |
|
654 |
* Two conversions are provided, both from time_t and struct tm. There |
|
655 |
* is no portable way to convert to either of these structures, as far |
|
656 |
* as I know. If you know of a portable way, send it to me. As a side |
|
657 |
* note - PNG has always been Year 2000 compliant! |
|
658 |
*/ |
|
659 |
typedef struct png_time_struct |
|
660 |
{ |
|
661 |
png_uint_16 year; /* full year, as in, 1995 */ |
|
662 |
png_byte month; /* month of year, 1 - 12 */ |
|
663 |
png_byte day; /* day of month, 1 - 31 */ |
|
664 |
png_byte hour; /* hour of day, 0 - 23 */ |
|
665 |
png_byte minute; /* minute of hour, 0 - 59 */ |
|
666 |
png_byte second; /* second of minute, 0 - 60 (for leap seconds) */ |
|
667 |
} png_time; |
|
29913 | 668 |
typedef png_time * png_timep; |
669 |
typedef const png_time * png_const_timep; |
|
670 |
typedef png_time * * png_timepp; |
|
671 |
||
672 |
#if defined(PNG_STORE_UNKNOWN_CHUNKS_SUPPORTED) ||\ |
|
673 |
defined(PNG_USER_CHUNKS_SUPPORTED) |
|
2 | 674 |
/* png_unknown_chunk is a structure to hold queued chunks for which there is |
675 |
* no specific support. The idea is that we can use this to queue |
|
676 |
* up private chunks for output even though the library doesn't actually |
|
677 |
* know about their semantics. |
|
29913 | 678 |
* |
679 |
* The data in the structure is set by libpng on read and used on write. |
|
2 | 680 |
*/ |
681 |
typedef struct png_unknown_chunk_t |
|
682 |
{ |
|
43321 | 683 |
png_byte name[5]; /* Textual chunk name with '\0' terminator */ |
684 |
png_byte *data; /* Data, should not be modified on read! */ |
|
685 |
png_size_t size; |
|
686 |
||
687 |
/* On write 'location' must be set using the flag values listed below. |
|
688 |
* Notice that on read it is set by libpng however the values stored have |
|
689 |
* more bits set than are listed below. Always treat the value as a |
|
690 |
* bitmask. On write set only one bit - setting multiple bits may cause the |
|
691 |
* chunk to be written in multiple places. |
|
692 |
*/ |
|
693 |
png_byte location; /* mode of operation at read time */ |
|
2 | 694 |
} |
695 |
png_unknown_chunk; |
|
29913 | 696 |
|
697 |
typedef png_unknown_chunk * png_unknown_chunkp; |
|
698 |
typedef const png_unknown_chunk * png_const_unknown_chunkp; |
|
699 |
typedef png_unknown_chunk * * png_unknown_chunkpp; |
|
2 | 700 |
#endif |
701 |
||
29913 | 702 |
/* Flag values for the unknown chunk location byte. */ |
10576 | 703 |
#define PNG_HAVE_IHDR 0x01 |
704 |
#define PNG_HAVE_PLTE 0x02 |
|
705 |
#define PNG_AFTER_IDAT 0x08 |
|
2 | 706 |
|
707 |
/* Maximum positive integer used in PNG is (2^31)-1 */ |
|
708 |
#define PNG_UINT_31_MAX ((png_uint_32)0x7fffffffL) |
|
709 |
#define PNG_UINT_32_MAX ((png_uint_32)(-1)) |
|
710 |
#define PNG_SIZE_MAX ((png_size_t)(-1)) |
|
10576 | 711 |
|
712 |
/* These are constants for fixed point values encoded in the |
|
713 |
* PNG specification manner (x100000) |
|
714 |
*/ |
|
715 |
#define PNG_FP_1 100000 |
|
716 |
#define PNG_FP_HALF 50000 |
|
717 |
#define PNG_FP_MAX ((png_fixed_point)0x7fffffffL) |
|
718 |
#define PNG_FP_MIN (-PNG_FP_MAX) |
|
2 | 719 |
|
720 |
/* These describe the color_type field in png_info. */ |
|
721 |
/* color type masks */ |
|
722 |
#define PNG_COLOR_MASK_PALETTE 1 |
|
723 |
#define PNG_COLOR_MASK_COLOR 2 |
|
724 |
#define PNG_COLOR_MASK_ALPHA 4 |
|
725 |
||
726 |
/* color types. Note that not all combinations are legal */ |
|
727 |
#define PNG_COLOR_TYPE_GRAY 0 |
|
728 |
#define PNG_COLOR_TYPE_PALETTE (PNG_COLOR_MASK_COLOR | PNG_COLOR_MASK_PALETTE) |
|
729 |
#define PNG_COLOR_TYPE_RGB (PNG_COLOR_MASK_COLOR) |
|
730 |
#define PNG_COLOR_TYPE_RGB_ALPHA (PNG_COLOR_MASK_COLOR | PNG_COLOR_MASK_ALPHA) |
|
731 |
#define PNG_COLOR_TYPE_GRAY_ALPHA (PNG_COLOR_MASK_ALPHA) |
|
732 |
/* aliases */ |
|
733 |
#define PNG_COLOR_TYPE_RGBA PNG_COLOR_TYPE_RGB_ALPHA |
|
734 |
#define PNG_COLOR_TYPE_GA PNG_COLOR_TYPE_GRAY_ALPHA |
|
735 |
||
736 |
/* This is for compression type. PNG 1.0-1.2 only define the single type. */ |
|
737 |
#define PNG_COMPRESSION_TYPE_BASE 0 /* Deflate method 8, 32K window */ |
|
738 |
#define PNG_COMPRESSION_TYPE_DEFAULT PNG_COMPRESSION_TYPE_BASE |
|
739 |
||
740 |
/* This is for filter type. PNG 1.0-1.2 only define the single type. */ |
|
741 |
#define PNG_FILTER_TYPE_BASE 0 /* Single row per-byte filtering */ |
|
742 |
#define PNG_INTRAPIXEL_DIFFERENCING 64 /* Used only in MNG datastreams */ |
|
743 |
#define PNG_FILTER_TYPE_DEFAULT PNG_FILTER_TYPE_BASE |
|
744 |
||
745 |
/* These are for the interlacing type. These values should NOT be changed. */ |
|
746 |
#define PNG_INTERLACE_NONE 0 /* Non-interlaced image */ |
|
747 |
#define PNG_INTERLACE_ADAM7 1 /* Adam7 interlacing */ |
|
748 |
#define PNG_INTERLACE_LAST 2 /* Not a valid value */ |
|
749 |
||
750 |
/* These are for the oFFs chunk. These values should NOT be changed. */ |
|
751 |
#define PNG_OFFSET_PIXEL 0 /* Offset in pixels */ |
|
752 |
#define PNG_OFFSET_MICROMETER 1 /* Offset in micrometers (1/10^6 meter) */ |
|
753 |
#define PNG_OFFSET_LAST 2 /* Not a valid value */ |
|
754 |
||
755 |
/* These are for the pCAL chunk. These values should NOT be changed. */ |
|
756 |
#define PNG_EQUATION_LINEAR 0 /* Linear transformation */ |
|
757 |
#define PNG_EQUATION_BASE_E 1 /* Exponential base e transform */ |
|
758 |
#define PNG_EQUATION_ARBITRARY 2 /* Arbitrary base exponential transform */ |
|
759 |
#define PNG_EQUATION_HYPERBOLIC 3 /* Hyperbolic sine transformation */ |
|
760 |
#define PNG_EQUATION_LAST 4 /* Not a valid value */ |
|
761 |
||
762 |
/* These are for the sCAL chunk. These values should NOT be changed. */ |
|
763 |
#define PNG_SCALE_UNKNOWN 0 /* unknown unit (image scale) */ |
|
764 |
#define PNG_SCALE_METER 1 /* meters per pixel */ |
|
765 |
#define PNG_SCALE_RADIAN 2 /* radians per pixel */ |
|
766 |
#define PNG_SCALE_LAST 3 /* Not a valid value */ |
|
767 |
||
768 |
/* These are for the pHYs chunk. These values should NOT be changed. */ |
|
769 |
#define PNG_RESOLUTION_UNKNOWN 0 /* pixels/unknown unit (aspect ratio) */ |
|
770 |
#define PNG_RESOLUTION_METER 1 /* pixels/meter */ |
|
771 |
#define PNG_RESOLUTION_LAST 2 /* Not a valid value */ |
|
772 |
||
773 |
/* These are for the sRGB chunk. These values should NOT be changed. */ |
|
774 |
#define PNG_sRGB_INTENT_PERCEPTUAL 0 |
|
775 |
#define PNG_sRGB_INTENT_RELATIVE 1 |
|
776 |
#define PNG_sRGB_INTENT_SATURATION 2 |
|
777 |
#define PNG_sRGB_INTENT_ABSOLUTE 3 |
|
778 |
#define PNG_sRGB_INTENT_LAST 4 /* Not a valid value */ |
|
779 |
||
780 |
/* This is for text chunks */ |
|
781 |
#define PNG_KEYWORD_MAX_LENGTH 79 |
|
782 |
||
783 |
/* Maximum number of entries in PLTE/sPLT/tRNS arrays */ |
|
784 |
#define PNG_MAX_PALETTE_LENGTH 256 |
|
785 |
||
786 |
/* These determine if an ancillary chunk's data has been successfully read |
|
787 |
* from the PNG header, or if the application has filled in the corresponding |
|
788 |
* data in the info_struct to be written into the output file. The values |
|
789 |
* of the PNG_INFO_<chunk> defines should NOT be changed. |
|
790 |
*/ |
|
40436
94ae0ede53a5
8155690: Update libPNG library to the latest up-to-date
azvegint
parents:
35296
diff
changeset
|
791 |
#define PNG_INFO_gAMA 0x0001U |
94ae0ede53a5
8155690: Update libPNG library to the latest up-to-date
azvegint
parents:
35296
diff
changeset
|
792 |
#define PNG_INFO_sBIT 0x0002U |
94ae0ede53a5
8155690: Update libPNG library to the latest up-to-date
azvegint
parents:
35296
diff
changeset
|
793 |
#define PNG_INFO_cHRM 0x0004U |
94ae0ede53a5
8155690: Update libPNG library to the latest up-to-date
azvegint
parents:
35296
diff
changeset
|
794 |
#define PNG_INFO_PLTE 0x0008U |
94ae0ede53a5
8155690: Update libPNG library to the latest up-to-date
azvegint
parents:
35296
diff
changeset
|
795 |
#define PNG_INFO_tRNS 0x0010U |
94ae0ede53a5
8155690: Update libPNG library to the latest up-to-date
azvegint
parents:
35296
diff
changeset
|
796 |
#define PNG_INFO_bKGD 0x0020U |
94ae0ede53a5
8155690: Update libPNG library to the latest up-to-date
azvegint
parents:
35296
diff
changeset
|
797 |
#define PNG_INFO_hIST 0x0040U |
94ae0ede53a5
8155690: Update libPNG library to the latest up-to-date
azvegint
parents:
35296
diff
changeset
|
798 |
#define PNG_INFO_pHYs 0x0080U |
94ae0ede53a5
8155690: Update libPNG library to the latest up-to-date
azvegint
parents:
35296
diff
changeset
|
799 |
#define PNG_INFO_oFFs 0x0100U |
94ae0ede53a5
8155690: Update libPNG library to the latest up-to-date
azvegint
parents:
35296
diff
changeset
|
800 |
#define PNG_INFO_tIME 0x0200U |
94ae0ede53a5
8155690: Update libPNG library to the latest up-to-date
azvegint
parents:
35296
diff
changeset
|
801 |
#define PNG_INFO_pCAL 0x0400U |
94ae0ede53a5
8155690: Update libPNG library to the latest up-to-date
azvegint
parents:
35296
diff
changeset
|
802 |
#define PNG_INFO_sRGB 0x0800U /* GR-P, 0.96a */ |
94ae0ede53a5
8155690: Update libPNG library to the latest up-to-date
azvegint
parents:
35296
diff
changeset
|
803 |
#define PNG_INFO_iCCP 0x1000U /* ESR, 1.0.6 */ |
94ae0ede53a5
8155690: Update libPNG library to the latest up-to-date
azvegint
parents:
35296
diff
changeset
|
804 |
#define PNG_INFO_sPLT 0x2000U /* ESR, 1.0.6 */ |
94ae0ede53a5
8155690: Update libPNG library to the latest up-to-date
azvegint
parents:
35296
diff
changeset
|
805 |
#define PNG_INFO_sCAL 0x4000U /* ESR, 1.0.6 */ |
94ae0ede53a5
8155690: Update libPNG library to the latest up-to-date
azvegint
parents:
35296
diff
changeset
|
806 |
#define PNG_INFO_IDAT 0x8000U /* ESR, 1.0.6 */ |
48280 | 807 |
#define PNG_INFO_eXIf 0x10000U /* GR-P, 1.6.31 */ |
2 | 808 |
|
809 |
/* This is used for the transformation routines, as some of them |
|
810 |
* change these values for the row. It also should enable using |
|
811 |
* the routines for other purposes. |
|
812 |
*/ |
|
813 |
typedef struct png_row_info_struct |
|
814 |
{ |
|
10576 | 815 |
png_uint_32 width; /* width of row */ |
816 |
png_size_t rowbytes; /* number of bytes in row */ |
|
817 |
png_byte color_type; /* color type of row */ |
|
818 |
png_byte bit_depth; /* bit depth of row */ |
|
819 |
png_byte channels; /* number of channels (1, 2, 3, or 4) */ |
|
2 | 820 |
png_byte pixel_depth; /* bits per pixel (depth * channels) */ |
821 |
} png_row_info; |
|
822 |
||
29913 | 823 |
typedef png_row_info * png_row_infop; |
824 |
typedef png_row_info * * png_row_infopp; |
|
10576 | 825 |
|
2 | 826 |
/* These are the function types for the I/O functions and for the functions |
827 |
* that allow the user to override the default I/O functions with his or her |
|
828 |
* own. The png_error_ptr type should match that of user-supplied warning |
|
829 |
* and error functions, while the png_rw_ptr type should match that of the |
|
10576 | 830 |
* user read/write data functions. Note that the 'write' function must not |
831 |
* modify the buffer it is passed. The 'read' function, on the other hand, is |
|
832 |
* expected to return the read data in the buffer. |
|
2 | 833 |
*/ |
10576 | 834 |
typedef PNG_CALLBACK(void, *png_error_ptr, (png_structp, png_const_charp)); |
835 |
typedef PNG_CALLBACK(void, *png_rw_ptr, (png_structp, png_bytep, png_size_t)); |
|
836 |
typedef PNG_CALLBACK(void, *png_flush_ptr, (png_structp)); |
|
837 |
typedef PNG_CALLBACK(void, *png_read_status_ptr, (png_structp, png_uint_32, |
|
838 |
int)); |
|
839 |
typedef PNG_CALLBACK(void, *png_write_status_ptr, (png_structp, png_uint_32, |
|
840 |
int)); |
|
2 | 841 |
|
842 |
#ifdef PNG_PROGRESSIVE_READ_SUPPORTED |
|
10576 | 843 |
typedef PNG_CALLBACK(void, *png_progressive_info_ptr, (png_structp, png_infop)); |
844 |
typedef PNG_CALLBACK(void, *png_progressive_end_ptr, (png_structp, png_infop)); |
|
845 |
||
846 |
/* The following callback receives png_uint_32 row_number, int pass for the |
|
847 |
* png_bytep data of the row. When transforming an interlaced image the |
|
848 |
* row number is the row number within the sub-image of the interlace pass, so |
|
849 |
* the value will increase to the height of the sub-image (not the full image) |
|
850 |
* then reset to 0 for the next pass. |
|
851 |
* |
|
852 |
* Use PNG_ROW_FROM_PASS_ROW(row, pass) and PNG_COL_FROM_PASS_COL(col, pass) to |
|
853 |
* find the output pixel (x,y) given an interlaced sub-image pixel |
|
854 |
* (row,col,pass). (See below for these macros.) |
|
855 |
*/ |
|
856 |
typedef PNG_CALLBACK(void, *png_progressive_row_ptr, (png_structp, png_bytep, |
|
857 |
png_uint_32, int)); |
|
2 | 858 |
#endif |
859 |
||
860 |
#if defined(PNG_READ_USER_TRANSFORM_SUPPORTED) || \ |
|
10576 | 861 |
defined(PNG_WRITE_USER_TRANSFORM_SUPPORTED) |
862 |
typedef PNG_CALLBACK(void, *png_user_transform_ptr, (png_structp, png_row_infop, |
|
863 |
png_bytep)); |
|
864 |
#endif |
|
865 |
||
866 |
#ifdef PNG_USER_CHUNKS_SUPPORTED |
|
867 |
typedef PNG_CALLBACK(int, *png_user_chunk_ptr, (png_structp, |
|
868 |
png_unknown_chunkp)); |
|
869 |
#endif |
|
870 |
#ifdef PNG_UNKNOWN_CHUNKS_SUPPORTED |
|
29913 | 871 |
/* not used anywhere */ |
872 |
/* typedef PNG_CALLBACK(void, *png_unknown_chunk_ptr, (png_structp)); */ |
|
2 | 873 |
#endif |
874 |
||
10576 | 875 |
#ifdef PNG_SETJMP_SUPPORTED |
876 |
/* This must match the function definition in <setjmp.h>, and the application |
|
877 |
* must include this before png.h to obtain the definition of jmp_buf. The |
|
878 |
* function is required to be PNG_NORETURN, but this is not checked. If the |
|
879 |
* function does return the application will crash via an abort() or similar |
|
880 |
* system level call. |
|
881 |
* |
|
882 |
* If you get a warning here while building the library you may need to make |
|
883 |
* changes to ensure that pnglibconf.h records the calling convention used by |
|
884 |
* your compiler. This may be very difficult - try using a different compiler |
|
885 |
* to build the library! |
|
886 |
*/ |
|
887 |
PNG_FUNCTION(void, (PNGCAPI *png_longjmp_ptr), PNGARG((jmp_buf, int)), typedef); |
|
2 | 888 |
#endif |
889 |
||
890 |
/* Transform masks for the high-level interface */ |
|
891 |
#define PNG_TRANSFORM_IDENTITY 0x0000 /* read and write */ |
|
892 |
#define PNG_TRANSFORM_STRIP_16 0x0001 /* read only */ |
|
893 |
#define PNG_TRANSFORM_STRIP_ALPHA 0x0002 /* read only */ |
|
894 |
#define PNG_TRANSFORM_PACKING 0x0004 /* read and write */ |
|
895 |
#define PNG_TRANSFORM_PACKSWAP 0x0008 /* read and write */ |
|
896 |
#define PNG_TRANSFORM_EXPAND 0x0010 /* read only */ |
|
897 |
#define PNG_TRANSFORM_INVERT_MONO 0x0020 /* read and write */ |
|
898 |
#define PNG_TRANSFORM_SHIFT 0x0040 /* read and write */ |
|
899 |
#define PNG_TRANSFORM_BGR 0x0080 /* read and write */ |
|
900 |
#define PNG_TRANSFORM_SWAP_ALPHA 0x0100 /* read and write */ |
|
901 |
#define PNG_TRANSFORM_SWAP_ENDIAN 0x0200 /* read and write */ |
|
902 |
#define PNG_TRANSFORM_INVERT_ALPHA 0x0400 /* read and write */ |
|
10576 | 903 |
#define PNG_TRANSFORM_STRIP_FILLER 0x0800 /* write only */ |
904 |
/* Added to libpng-1.2.34 */ |
|
905 |
#define PNG_TRANSFORM_STRIP_FILLER_BEFORE PNG_TRANSFORM_STRIP_FILLER |
|
906 |
#define PNG_TRANSFORM_STRIP_FILLER_AFTER 0x1000 /* write only */ |
|
907 |
/* Added to libpng-1.4.0 */ |
|
908 |
#define PNG_TRANSFORM_GRAY_TO_RGB 0x2000 /* read only */ |
|
909 |
/* Added to libpng-1.5.4 */ |
|
910 |
#define PNG_TRANSFORM_EXPAND_16 0x4000 /* read only */ |
|
35296 | 911 |
#if INT_MAX >= 0x8000 /* else this might break */ |
10576 | 912 |
#define PNG_TRANSFORM_SCALE_16 0x8000 /* read only */ |
35296 | 913 |
#endif |
2 | 914 |
|
915 |
/* Flags for MNG supported features */ |
|
916 |
#define PNG_FLAG_MNG_EMPTY_PLTE 0x01 |
|
917 |
#define PNG_FLAG_MNG_FILTER_64 0x04 |
|
918 |
#define PNG_ALL_MNG_FEATURES 0x05 |
|
919 |
||
10576 | 920 |
/* NOTE: prior to 1.5 these functions had no 'API' style declaration, |
921 |
* this allowed the zlib default functions to be used on Windows |
|
922 |
* platforms. In 1.5 the zlib default malloc (which just calls malloc and |
|
923 |
* ignores the first argument) should be completely compatible with the |
|
924 |
* following. |
|
2 | 925 |
*/ |
10576 | 926 |
typedef PNG_CALLBACK(png_voidp, *png_malloc_ptr, (png_structp, |
927 |
png_alloc_size_t)); |
|
928 |
typedef PNG_CALLBACK(void, *png_free_ptr, (png_structp, png_voidp)); |
|
2 | 929 |
|
35296 | 930 |
/* Section 4: exported functions |
10576 | 931 |
* Here are the function definitions most commonly used. This is not |
932 |
* the place to find out how to use libpng. See libpng-manual.txt for the |
|
2 | 933 |
* full explanation, see example.c for the summary. This just provides |
934 |
* a simple one line description of the use of each function. |
|
10576 | 935 |
* |
936 |
* The PNG_EXPORT() and PNG_EXPORTA() macros used below are defined in |
|
937 |
* pngconf.h and in the *.dfn files in the scripts directory. |
|
938 |
* |
|
939 |
* PNG_EXPORT(ordinal, type, name, (args)); |
|
940 |
* |
|
941 |
* ordinal: ordinal that is used while building |
|
942 |
* *.def files. The ordinal value is only |
|
943 |
* relevant when preprocessing png.h with |
|
944 |
* the *.dfn files for building symbol table |
|
945 |
* entries, and are removed by pngconf.h. |
|
946 |
* type: return type of the function |
|
947 |
* name: function name |
|
948 |
* args: function arguments, with types |
|
949 |
* |
|
950 |
* When we wish to append attributes to a function prototype we use |
|
951 |
* the PNG_EXPORTA() macro instead. |
|
952 |
* |
|
953 |
* PNG_EXPORTA(ordinal, type, name, (args), attributes); |
|
954 |
* |
|
955 |
* ordinal, type, name, and args: same as in PNG_EXPORT(). |
|
956 |
* attributes: function attributes |
|
2 | 957 |
*/ |
958 |
||
959 |
/* Returns the version number of the library */ |
|
10576 | 960 |
PNG_EXPORT(1, png_uint_32, png_access_version_number, (void)); |
2 | 961 |
|
962 |
/* Tell lib we have already handled the first <num_bytes> magic bytes. |
|
963 |
* Handling more than 8 bytes from the beginning of the file is an error. |
|
964 |
*/ |
|
29913 | 965 |
PNG_EXPORT(2, void, png_set_sig_bytes, (png_structrp png_ptr, int num_bytes)); |
2 | 966 |
|
967 |
/* Check sig[start] through sig[start + num_to_check - 1] to see if it's a |
|
968 |
* PNG file. Returns zero if the supplied bytes match the 8-byte PNG |
|
969 |
* signature, and non-zero otherwise. Having num_to_check == 0 or |
|
970 |
* start > 7 will always fail (ie return non-zero). |
|
971 |
*/ |
|
10576 | 972 |
PNG_EXPORT(3, int, png_sig_cmp, (png_const_bytep sig, png_size_t start, |
973 |
png_size_t num_to_check)); |
|
2 | 974 |
|
975 |
/* Simple signature checking function. This is the same as calling |
|
976 |
* png_check_sig(sig, n) := !png_sig_cmp(sig, 0, n). |
|
977 |
*/ |
|
10576 | 978 |
#define png_check_sig(sig, n) !png_sig_cmp((sig), 0, (n)) |
2 | 979 |
|
980 |
/* Allocate and initialize png_ptr struct for reading, and any other memory. */ |
|
10576 | 981 |
PNG_EXPORTA(4, png_structp, png_create_read_struct, |
982 |
(png_const_charp user_png_ver, png_voidp error_ptr, |
|
983 |
png_error_ptr error_fn, png_error_ptr warn_fn), |
|
984 |
PNG_ALLOCATED); |
|
2 | 985 |
|
986 |
/* Allocate and initialize png_ptr struct for writing, and any other memory */ |
|
10576 | 987 |
PNG_EXPORTA(5, png_structp, png_create_write_struct, |
988 |
(png_const_charp user_png_ver, png_voidp error_ptr, png_error_ptr error_fn, |
|
989 |
png_error_ptr warn_fn), |
|
990 |
PNG_ALLOCATED); |
|
991 |
||
992 |
PNG_EXPORT(6, png_size_t, png_get_compression_buffer_size, |
|
29913 | 993 |
(png_const_structrp png_ptr)); |
994 |
||
995 |
PNG_EXPORT(7, void, png_set_compression_buffer_size, (png_structrp png_ptr, |
|
10576 | 996 |
png_size_t size)); |
2 | 997 |
|
10576 | 998 |
/* Moved from pngconf.h in 1.4.0 and modified to ensure setjmp/longjmp |
999 |
* match up. |
|
1000 |
*/ |
|
1001 |
#ifdef PNG_SETJMP_SUPPORTED |
|
1002 |
/* This function returns the jmp_buf built in to *png_ptr. It must be |
|
1003 |
* supplied with an appropriate 'longjmp' function to use on that jmp_buf |
|
1004 |
* unless the default error function is overridden in which case NULL is |
|
1005 |
* acceptable. The size of the jmp_buf is checked against the actual size |
|
1006 |
* allocated by the library - the call will return NULL on a mismatch |
|
1007 |
* indicating an ABI mismatch. |
|
1008 |
*/ |
|
29913 | 1009 |
PNG_EXPORT(8, jmp_buf*, png_set_longjmp_fn, (png_structrp png_ptr, |
10576 | 1010 |
png_longjmp_ptr longjmp_fn, size_t jmp_buf_size)); |
1011 |
# define png_jmpbuf(png_ptr) \ |
|
29913 | 1012 |
(*png_set_longjmp_fn((png_ptr), longjmp, (sizeof (jmp_buf)))) |
10576 | 1013 |
#else |
1014 |
# define png_jmpbuf(png_ptr) \ |
|
1015 |
(LIBPNG_WAS_COMPILED_WITH__PNG_NO_SETJMP) |
|
2 | 1016 |
#endif |
10576 | 1017 |
/* This function should be used by libpng applications in place of |
1018 |
* longjmp(png_ptr->jmpbuf, val). If longjmp_fn() has been set, it |
|
1019 |
* will use it; otherwise it will call PNG_ABORT(). This function was |
|
1020 |
* added in libpng-1.5.0. |
|
1021 |
*/ |
|
29913 | 1022 |
PNG_EXPORTA(9, void, png_longjmp, (png_const_structrp png_ptr, int val), |
10576 | 1023 |
PNG_NORETURN); |
2 | 1024 |
|
10576 | 1025 |
#ifdef PNG_READ_SUPPORTED |
1026 |
/* Reset the compression stream */ |
|
29913 | 1027 |
PNG_EXPORTA(10, int, png_reset_zstream, (png_structrp png_ptr), PNG_DEPRECATED); |
2 | 1028 |
#endif |
1029 |
||
1030 |
/* New functions added in libpng-1.0.2 (not enabled by default until 1.2.0) */ |
|
1031 |
#ifdef PNG_USER_MEM_SUPPORTED |
|
10576 | 1032 |
PNG_EXPORTA(11, png_structp, png_create_read_struct_2, |
1033 |
(png_const_charp user_png_ver, png_voidp error_ptr, png_error_ptr error_fn, |
|
1034 |
png_error_ptr warn_fn, |
|
1035 |
png_voidp mem_ptr, png_malloc_ptr malloc_fn, png_free_ptr free_fn), |
|
1036 |
PNG_ALLOCATED); |
|
1037 |
PNG_EXPORTA(12, png_structp, png_create_write_struct_2, |
|
1038 |
(png_const_charp user_png_ver, png_voidp error_ptr, png_error_ptr error_fn, |
|
1039 |
png_error_ptr warn_fn, |
|
1040 |
png_voidp mem_ptr, png_malloc_ptr malloc_fn, png_free_ptr free_fn), |
|
1041 |
PNG_ALLOCATED); |
|
2 | 1042 |
#endif |
1043 |
||
10576 | 1044 |
/* Write the PNG file signature. */ |
29913 | 1045 |
PNG_EXPORT(13, void, png_write_sig, (png_structrp png_ptr)); |
10576 | 1046 |
|
2 | 1047 |
/* Write a PNG chunk - size, type, (optional) data, CRC. */ |
29913 | 1048 |
PNG_EXPORT(14, void, png_write_chunk, (png_structrp png_ptr, png_const_bytep |
10576 | 1049 |
chunk_name, png_const_bytep data, png_size_t length)); |
2 | 1050 |
|
1051 |
/* Write the start of a PNG chunk - length and chunk name. */ |
|
29913 | 1052 |
PNG_EXPORT(15, void, png_write_chunk_start, (png_structrp png_ptr, |
10576 | 1053 |
png_const_bytep chunk_name, png_uint_32 length)); |
2 | 1054 |
|
1055 |
/* Write the data of a PNG chunk started with png_write_chunk_start(). */ |
|
29913 | 1056 |
PNG_EXPORT(16, void, png_write_chunk_data, (png_structrp png_ptr, |
10576 | 1057 |
png_const_bytep data, png_size_t length)); |
2 | 1058 |
|
1059 |
/* Finish a chunk started with png_write_chunk_start() (includes CRC). */ |
|
29913 | 1060 |
PNG_EXPORT(17, void, png_write_chunk_end, (png_structrp png_ptr)); |
2 | 1061 |
|
1062 |
/* Allocate and initialize the info structure */ |
|
29913 | 1063 |
PNG_EXPORTA(18, png_infop, png_create_info_struct, (png_const_structrp png_ptr), |
10576 | 1064 |
PNG_ALLOCATED); |
2 | 1065 |
|
29913 | 1066 |
/* DEPRECATED: this function allowed init structures to be created using the |
1067 |
* default allocation method (typically malloc). Use is deprecated in 1.6.0 and |
|
1068 |
* the API will be removed in the future. |
|
1069 |
*/ |
|
1070 |
PNG_EXPORTA(19, void, png_info_init_3, (png_infopp info_ptr, |
|
1071 |
png_size_t png_info_struct_size), PNG_DEPRECATED); |
|
2 | 1072 |
|
1073 |
/* Writes all the PNG information before the image. */ |
|
10576 | 1074 |
PNG_EXPORT(20, void, png_write_info_before_PLTE, |
29913 | 1075 |
(png_structrp png_ptr, png_const_inforp info_ptr)); |
10576 | 1076 |
PNG_EXPORT(21, void, png_write_info, |
29913 | 1077 |
(png_structrp png_ptr, png_const_inforp info_ptr)); |
2 | 1078 |
|
10576 | 1079 |
#ifdef PNG_SEQUENTIAL_READ_SUPPORTED |
1080 |
/* Read the information before the actual image data. */ |
|
1081 |
PNG_EXPORT(22, void, png_read_info, |
|
29913 | 1082 |
(png_structrp png_ptr, png_inforp info_ptr)); |
2 | 1083 |
#endif |
1084 |
||
10576 | 1085 |
#ifdef PNG_TIME_RFC1123_SUPPORTED |
29913 | 1086 |
/* Convert to a US string format: there is no localization support in this |
1087 |
* routine. The original implementation used a 29 character buffer in |
|
1088 |
* png_struct, this will be removed in future versions. |
|
1089 |
*/ |
|
1090 |
#if PNG_LIBPNG_VER < 10700 |
|
1091 |
/* To do: remove this from libpng17 (and from libpng17/png.c and pngstruct.h) */ |
|
1092 |
PNG_EXPORTA(23, png_const_charp, png_convert_to_rfc1123, (png_structrp png_ptr, |
|
1093 |
png_const_timep ptime),PNG_DEPRECATED); |
|
1094 |
#endif |
|
1095 |
PNG_EXPORT(241, int, png_convert_to_rfc1123_buffer, (char out[29], |
|
10576 | 1096 |
png_const_timep ptime)); |
2 | 1097 |
#endif |
1098 |
||
10576 | 1099 |
#ifdef PNG_CONVERT_tIME_SUPPORTED |
1100 |
/* Convert from a struct tm to png_time */ |
|
1101 |
PNG_EXPORT(24, void, png_convert_from_struct_tm, (png_timep ptime, |
|
29913 | 1102 |
const struct tm * ttime)); |
2 | 1103 |
|
10576 | 1104 |
/* Convert from time_t to png_time. Uses gmtime() */ |
29913 | 1105 |
PNG_EXPORT(25, void, png_convert_from_time_t, (png_timep ptime, time_t ttime)); |
1106 |
#endif /* CONVERT_tIME */ |
|
2 | 1107 |
|
10576 | 1108 |
#ifdef PNG_READ_EXPAND_SUPPORTED |
2 | 1109 |
/* Expand data to 24-bit RGB, or 8-bit grayscale, with alpha if available. */ |
29913 | 1110 |
PNG_EXPORT(26, void, png_set_expand, (png_structrp png_ptr)); |
1111 |
PNG_EXPORT(27, void, png_set_expand_gray_1_2_4_to_8, (png_structrp png_ptr)); |
|
1112 |
PNG_EXPORT(28, void, png_set_palette_to_rgb, (png_structrp png_ptr)); |
|
1113 |
PNG_EXPORT(29, void, png_set_tRNS_to_alpha, (png_structrp png_ptr)); |
|
2 | 1114 |
#endif |
10576 | 1115 |
|
1116 |
#ifdef PNG_READ_EXPAND_16_SUPPORTED |
|
1117 |
/* Expand to 16-bit channels, forces conversion of palette to RGB and expansion |
|
1118 |
* of a tRNS chunk if present. |
|
1119 |
*/ |
|
29913 | 1120 |
PNG_EXPORT(221, void, png_set_expand_16, (png_structrp png_ptr)); |
2 | 1121 |
#endif |
1122 |
||
1123 |
#if defined(PNG_READ_BGR_SUPPORTED) || defined(PNG_WRITE_BGR_SUPPORTED) |
|
1124 |
/* Use blue, green, red order for pixels. */ |
|
29913 | 1125 |
PNG_EXPORT(30, void, png_set_bgr, (png_structrp png_ptr)); |
10576 | 1126 |
#endif |
1127 |
||
1128 |
#ifdef PNG_READ_GRAY_TO_RGB_SUPPORTED |
|
1129 |
/* Expand the grayscale to 24-bit RGB if necessary. */ |
|
29913 | 1130 |
PNG_EXPORT(31, void, png_set_gray_to_rgb, (png_structrp png_ptr)); |
10576 | 1131 |
#endif |
1132 |
||
1133 |
#ifdef PNG_READ_RGB_TO_GRAY_SUPPORTED |
|
1134 |
/* Reduce RGB to grayscale. */ |
|
29913 | 1135 |
#define PNG_ERROR_ACTION_NONE 1 |
1136 |
#define PNG_ERROR_ACTION_WARN 2 |
|
1137 |
#define PNG_ERROR_ACTION_ERROR 3 |
|
1138 |
#define PNG_RGB_TO_GRAY_DEFAULT (-1)/*for red/green coefficients*/ |
|
1139 |
||
1140 |
PNG_FP_EXPORT(32, void, png_set_rgb_to_gray, (png_structrp png_ptr, |
|
1141 |
int error_action, double red, double green)) |
|
1142 |
PNG_FIXED_EXPORT(33, void, png_set_rgb_to_gray_fixed, (png_structrp png_ptr, |
|
1143 |
int error_action, png_fixed_point red, png_fixed_point green)) |
|
1144 |
||
1145 |
PNG_EXPORT(34, png_byte, png_get_rgb_to_gray_status, (png_const_structrp |
|
10576 | 1146 |
png_ptr)); |
1147 |
#endif |
|
1148 |
||
1149 |
#ifdef PNG_BUILD_GRAYSCALE_PALETTE_SUPPORTED |
|
1150 |
PNG_EXPORT(35, void, png_build_grayscale_palette, (int bit_depth, |
|
1151 |
png_colorp palette)); |
|
2 | 1152 |
#endif |
1153 |
||
10576 | 1154 |
#ifdef PNG_READ_ALPHA_MODE_SUPPORTED |
29913 | 1155 |
/* How the alpha channel is interpreted - this affects how the color channels |
1156 |
* of a PNG file are returned to the calling application when an alpha channel, |
|
1157 |
* or a tRNS chunk in a palette file, is present. |
|
10576 | 1158 |
* |
1159 |
* This has no effect on the way pixels are written into a PNG output |
|
1160 |
* datastream. The color samples in a PNG datastream are never premultiplied |
|
1161 |
* with the alpha samples. |
|
1162 |
* |
|
1163 |
* The default is to return data according to the PNG specification: the alpha |
|
1164 |
* channel is a linear measure of the contribution of the pixel to the |
|
29913 | 1165 |
* corresponding composited pixel, and the color channels are unassociated |
1166 |
* (not premultiplied). The gamma encoded color channels must be scaled |
|
1167 |
* according to the contribution and to do this it is necessary to undo |
|
10576 | 1168 |
* the encoding, scale the color values, perform the composition and reencode |
1169 |
* the values. This is the 'PNG' mode. |
|
1170 |
* |
|
1171 |
* The alternative is to 'associate' the alpha with the color information by |
|
29913 | 1172 |
* storing color channel values that have been scaled by the alpha. |
1173 |
* image. These are the 'STANDARD', 'ASSOCIATED' or 'PREMULTIPLIED' modes |
|
1174 |
* (the latter being the two common names for associated alpha color channels). |
|
10576 | 1175 |
* |
29913 | 1176 |
* For the 'OPTIMIZED' mode, a pixel is treated as opaque only if the alpha |
1177 |
* value is equal to the maximum value. |
|
10576 | 1178 |
* |
1179 |
* The final choice is to gamma encode the alpha channel as well. This is |
|
1180 |
* broken because, in practice, no implementation that uses this choice |
|
1181 |
* correctly undoes the encoding before handling alpha composition. Use this |
|
1182 |
* choice only if other serious errors in the software or hardware you use |
|
1183 |
* mandate it; the typical serious error is for dark halos to appear around |
|
1184 |
* opaque areas of the composited PNG image because of arithmetic overflow. |
|
1185 |
* |
|
1186 |
* The API function png_set_alpha_mode specifies which of these choices to use |
|
1187 |
* with an enumerated 'mode' value and the gamma of the required output: |
|
1188 |
*/ |
|
1189 |
#define PNG_ALPHA_PNG 0 /* according to the PNG standard */ |
|
1190 |
#define PNG_ALPHA_STANDARD 1 /* according to Porter/Duff */ |
|
1191 |
#define PNG_ALPHA_ASSOCIATED 1 /* as above; this is the normal practice */ |
|
1192 |
#define PNG_ALPHA_PREMULTIPLIED 1 /* as above */ |
|
1193 |
#define PNG_ALPHA_OPTIMIZED 2 /* 'PNG' for opaque pixels, else 'STANDARD' */ |
|
1194 |
#define PNG_ALPHA_BROKEN 3 /* the alpha channel is gamma encoded */ |
|
1195 |
||
29913 | 1196 |
PNG_FP_EXPORT(227, void, png_set_alpha_mode, (png_structrp png_ptr, int mode, |
1197 |
double output_gamma)) |
|
1198 |
PNG_FIXED_EXPORT(228, void, png_set_alpha_mode_fixed, (png_structrp png_ptr, |
|
1199 |
int mode, png_fixed_point output_gamma)) |
|
2 | 1200 |
#endif |
1201 |
||
29913 | 1202 |
#if defined(PNG_GAMMA_SUPPORTED) || defined(PNG_READ_ALPHA_MODE_SUPPORTED) |
10576 | 1203 |
/* The output_gamma value is a screen gamma in libpng terminology: it expresses |
29913 | 1204 |
* how to decode the output values, not how they are encoded. |
10576 | 1205 |
*/ |
1206 |
#define PNG_DEFAULT_sRGB -1 /* sRGB gamma and color space */ |
|
1207 |
#define PNG_GAMMA_MAC_18 -2 /* Old Mac '1.8' gamma and color space */ |
|
1208 |
#define PNG_GAMMA_sRGB 220000 /* Television standards--matches sRGB gamma */ |
|
1209 |
#define PNG_GAMMA_LINEAR PNG_FP_1 /* Linear */ |
|
2 | 1210 |
#endif |
1211 |
||
10576 | 1212 |
/* The following are examples of calls to png_set_alpha_mode to achieve the |
1213 |
* required overall gamma correction and, where necessary, alpha |
|
1214 |
* premultiplication. |
|
1215 |
* |
|
1216 |
* png_set_alpha_mode(pp, PNG_ALPHA_PNG, PNG_DEFAULT_sRGB); |
|
1217 |
* This is the default libpng handling of the alpha channel - it is not |
|
1218 |
* pre-multiplied into the color components. In addition the call states |
|
1219 |
* that the output is for a sRGB system and causes all PNG files without gAMA |
|
1220 |
* chunks to be assumed to be encoded using sRGB. |
|
1221 |
* |
|
1222 |
* png_set_alpha_mode(pp, PNG_ALPHA_PNG, PNG_GAMMA_MAC); |
|
1223 |
* In this case the output is assumed to be something like an sRGB conformant |
|
1224 |
* display preceeded by a power-law lookup table of power 1.45. This is how |
|
1225 |
* early Mac systems behaved. |
|
1226 |
* |
|
1227 |
* png_set_alpha_mode(pp, PNG_ALPHA_STANDARD, PNG_GAMMA_LINEAR); |
|
1228 |
* This is the classic Jim Blinn approach and will work in academic |
|
1229 |
* environments where everything is done by the book. It has the shortcoming |
|
1230 |
* of assuming that input PNG data with no gamma information is linear - this |
|
1231 |
* is unlikely to be correct unless the PNG files where generated locally. |
|
1232 |
* Most of the time the output precision will be so low as to show |
|
1233 |
* significant banding in dark areas of the image. |
|
1234 |
* |
|
1235 |
* png_set_expand_16(pp); |
|
1236 |
* png_set_alpha_mode(pp, PNG_ALPHA_STANDARD, PNG_DEFAULT_sRGB); |
|
1237 |
* This is a somewhat more realistic Jim Blinn inspired approach. PNG files |
|
1238 |
* are assumed to have the sRGB encoding if not marked with a gamma value and |
|
1239 |
* the output is always 16 bits per component. This permits accurate scaling |
|
1240 |
* and processing of the data. If you know that your input PNG files were |
|
1241 |
* generated locally you might need to replace PNG_DEFAULT_sRGB with the |
|
1242 |
* correct value for your system. |
|
1243 |
* |
|
1244 |
* png_set_alpha_mode(pp, PNG_ALPHA_OPTIMIZED, PNG_DEFAULT_sRGB); |
|
1245 |
* If you just need to composite the PNG image onto an existing background |
|
1246 |
* and if you control the code that does this you can use the optimization |
|
1247 |
* setting. In this case you just copy completely opaque pixels to the |
|
1248 |
* output. For pixels that are not completely transparent (you just skip |
|
1249 |
* those) you do the composition math using png_composite or png_composite_16 |
|
1250 |
* below then encode the resultant 8-bit or 16-bit values to match the output |
|
1251 |
* encoding. |
|
1252 |
* |
|
1253 |
* Other cases |
|
1254 |
* If neither the PNG nor the standard linear encoding work for you because |
|
1255 |
* of the software or hardware you use then you have a big problem. The PNG |
|
1256 |
* case will probably result in halos around the image. The linear encoding |
|
1257 |
* will probably result in a washed out, too bright, image (it's actually too |
|
1258 |
* contrasty.) Try the ALPHA_OPTIMIZED mode above - this will probably |
|
1259 |
* substantially reduce the halos. Alternatively try: |
|
1260 |
* |
|
1261 |
* png_set_alpha_mode(pp, PNG_ALPHA_BROKEN, PNG_DEFAULT_sRGB); |
|
1262 |
* This option will also reduce the halos, but there will be slight dark |
|
1263 |
* halos round the opaque parts of the image where the background is light. |
|
1264 |
* In the OPTIMIZED mode the halos will be light halos where the background |
|
1265 |
* is dark. Take your pick - the halos are unavoidable unless you can get |
|
1266 |
* your hardware/software fixed! (The OPTIMIZED approach is slightly |
|
1267 |
* faster.) |
|
1268 |
* |
|
1269 |
* When the default gamma of PNG files doesn't match the output gamma. |
|
1270 |
* If you have PNG files with no gamma information png_set_alpha_mode allows |
|
29913 | 1271 |
* you to provide a default gamma, but it also sets the ouput gamma to the |
10576 | 1272 |
* matching value. If you know your PNG files have a gamma that doesn't |
1273 |
* match the output you can take advantage of the fact that |
|
1274 |
* png_set_alpha_mode always sets the output gamma but only sets the PNG |
|
1275 |
* default if it is not already set: |
|
1276 |
* |
|
1277 |
* png_set_alpha_mode(pp, PNG_ALPHA_PNG, PNG_DEFAULT_sRGB); |
|
1278 |
* png_set_alpha_mode(pp, PNG_ALPHA_PNG, PNG_GAMMA_MAC); |
|
1279 |
* The first call sets both the default and the output gamma values, the |
|
1280 |
* second call overrides the output gamma without changing the default. This |
|
1281 |
* is easier than achieving the same effect with png_set_gamma. You must use |
|
1282 |
* PNG_ALPHA_PNG for the first call - internal checking in png_set_alpha will |
|
1283 |
* fire if more than one call to png_set_alpha_mode and png_set_background is |
|
1284 |
* made in the same read operation, however multiple calls with PNG_ALPHA_PNG |
|
1285 |
* are ignored. |
|
1286 |
*/ |
|
2 | 1287 |
|
10576 | 1288 |
#ifdef PNG_READ_STRIP_ALPHA_SUPPORTED |
29913 | 1289 |
PNG_EXPORT(36, void, png_set_strip_alpha, (png_structrp png_ptr)); |
2 | 1290 |
#endif |
1291 |
||
1292 |
#if defined(PNG_READ_SWAP_ALPHA_SUPPORTED) || \ |
|
1293 |
defined(PNG_WRITE_SWAP_ALPHA_SUPPORTED) |
|
29913 | 1294 |
PNG_EXPORT(37, void, png_set_swap_alpha, (png_structrp png_ptr)); |
2 | 1295 |
#endif |
1296 |
||
1297 |
#if defined(PNG_READ_INVERT_ALPHA_SUPPORTED) || \ |
|
1298 |
defined(PNG_WRITE_INVERT_ALPHA_SUPPORTED) |
|
29913 | 1299 |
PNG_EXPORT(38, void, png_set_invert_alpha, (png_structrp png_ptr)); |
2 | 1300 |
#endif |
1301 |
||
1302 |
#if defined(PNG_READ_FILLER_SUPPORTED) || defined(PNG_WRITE_FILLER_SUPPORTED) |
|
35296 | 1303 |
/* Add a filler byte to 8-bit or 16-bit Gray or 24-bit or 48-bit RGB images. */ |
29913 | 1304 |
PNG_EXPORT(39, void, png_set_filler, (png_structrp png_ptr, png_uint_32 filler, |
10576 | 1305 |
int flags)); |
2 | 1306 |
/* The values of the PNG_FILLER_ defines should NOT be changed */ |
10576 | 1307 |
# define PNG_FILLER_BEFORE 0 |
1308 |
# define PNG_FILLER_AFTER 1 |
|
35296 | 1309 |
/* Add an alpha byte to 8-bit or 16-bit Gray or 24-bit or 48-bit RGB images. */ |
29913 | 1310 |
PNG_EXPORT(40, void, png_set_add_alpha, (png_structrp png_ptr, |
1311 |
png_uint_32 filler, int flags)); |
|
1312 |
#endif /* READ_FILLER || WRITE_FILLER */ |
|
2 | 1313 |
|
1314 |
#if defined(PNG_READ_SWAP_SUPPORTED) || defined(PNG_WRITE_SWAP_SUPPORTED) |
|
1315 |
/* Swap bytes in 16-bit depth files. */ |
|
29913 | 1316 |
PNG_EXPORT(41, void, png_set_swap, (png_structrp png_ptr)); |
2 | 1317 |
#endif |
1318 |
||
1319 |
#if defined(PNG_READ_PACK_SUPPORTED) || defined(PNG_WRITE_PACK_SUPPORTED) |
|
1320 |
/* Use 1 byte per pixel in 1, 2, or 4-bit depth files. */ |
|
29913 | 1321 |
PNG_EXPORT(42, void, png_set_packing, (png_structrp png_ptr)); |
2 | 1322 |
#endif |
1323 |
||
10576 | 1324 |
#if defined(PNG_READ_PACKSWAP_SUPPORTED) || \ |
1325 |
defined(PNG_WRITE_PACKSWAP_SUPPORTED) |
|
2 | 1326 |
/* Swap packing order of pixels in bytes. */ |
29913 | 1327 |
PNG_EXPORT(43, void, png_set_packswap, (png_structrp png_ptr)); |
2 | 1328 |
#endif |
1329 |
||
1330 |
#if defined(PNG_READ_SHIFT_SUPPORTED) || defined(PNG_WRITE_SHIFT_SUPPORTED) |
|
1331 |
/* Converts files to legal bit depths. */ |
|
29913 | 1332 |
PNG_EXPORT(44, void, png_set_shift, (png_structrp png_ptr, png_const_color_8p |
10576 | 1333 |
true_bits)); |
2 | 1334 |
#endif |
1335 |
||
1336 |
#if defined(PNG_READ_INTERLACING_SUPPORTED) || \ |
|
1337 |
defined(PNG_WRITE_INTERLACING_SUPPORTED) |
|
10576 | 1338 |
/* Have the code handle the interlacing. Returns the number of passes. |
1339 |
* MUST be called before png_read_update_info or png_start_read_image, |
|
1340 |
* otherwise it will not have the desired effect. Note that it is still |
|
1341 |
* necessary to call png_read_row or png_read_rows png_get_image_height |
|
1342 |
* times for each pass. |
|
1343 |
*/ |
|
29913 | 1344 |
PNG_EXPORT(45, int, png_set_interlace_handling, (png_structrp png_ptr)); |
2 | 1345 |
#endif |
1346 |
||
1347 |
#if defined(PNG_READ_INVERT_SUPPORTED) || defined(PNG_WRITE_INVERT_SUPPORTED) |
|
1348 |
/* Invert monochrome files */ |
|
29913 | 1349 |
PNG_EXPORT(46, void, png_set_invert_mono, (png_structrp png_ptr)); |
2 | 1350 |
#endif |
1351 |
||
10576 | 1352 |
#ifdef PNG_READ_BACKGROUND_SUPPORTED |
1353 |
/* Handle alpha and tRNS by replacing with a background color. Prior to |
|
1354 |
* libpng-1.5.4 this API must not be called before the PNG file header has been |
|
1355 |
* read. Doing so will result in unexpected behavior and possible warnings or |
|
1356 |
* errors if the PNG file contains a bKGD chunk. |
|
1357 |
*/ |
|
29913 | 1358 |
PNG_FP_EXPORT(47, void, png_set_background, (png_structrp png_ptr, |
10576 | 1359 |
png_const_color_16p background_color, int background_gamma_code, |
29913 | 1360 |
int need_expand, double background_gamma)) |
1361 |
PNG_FIXED_EXPORT(215, void, png_set_background_fixed, (png_structrp png_ptr, |
|
10576 | 1362 |
png_const_color_16p background_color, int background_gamma_code, |
29913 | 1363 |
int need_expand, png_fixed_point background_gamma)) |
2 | 1364 |
#endif |
10576 | 1365 |
#ifdef PNG_READ_BACKGROUND_SUPPORTED |
1366 |
# define PNG_BACKGROUND_GAMMA_UNKNOWN 0 |
|
1367 |
# define PNG_BACKGROUND_GAMMA_SCREEN 1 |
|
1368 |
# define PNG_BACKGROUND_GAMMA_FILE 2 |
|
1369 |
# define PNG_BACKGROUND_GAMMA_UNIQUE 3 |
|
2 | 1370 |
#endif |
1371 |
||
10576 | 1372 |
#ifdef PNG_READ_SCALE_16_TO_8_SUPPORTED |
1373 |
/* Scale a 16-bit depth file down to 8-bit, accurately. */ |
|
29913 | 1374 |
PNG_EXPORT(229, void, png_set_scale_16, (png_structrp png_ptr)); |
2 | 1375 |
#endif |
1376 |
||
10576 | 1377 |
#ifdef PNG_READ_STRIP_16_TO_8_SUPPORTED |
40436
94ae0ede53a5
8155690: Update libPNG library to the latest up-to-date
azvegint
parents:
35296
diff
changeset
|
1378 |
#define PNG_READ_16_TO_8_SUPPORTED /* Name prior to 1.5.4 */ |
10576 | 1379 |
/* Strip the second byte of information from a 16-bit depth file. */ |
29913 | 1380 |
PNG_EXPORT(48, void, png_set_strip_16, (png_structrp png_ptr)); |
2 | 1381 |
#endif |
1382 |
||
10576 | 1383 |
#ifdef PNG_READ_QUANTIZE_SUPPORTED |
1384 |
/* Turn on quantizing, and reduce the palette to the number of colors |
|
1385 |
* available. |
|
1386 |
*/ |
|
29913 | 1387 |
PNG_EXPORT(49, void, png_set_quantize, (png_structrp png_ptr, |
1388 |
png_colorp palette, int num_palette, int maximum_colors, |
|
1389 |
png_const_uint_16p histogram, int full_quantize)); |
|
2 | 1390 |
#endif |
1391 |
||
10576 | 1392 |
#ifdef PNG_READ_GAMMA_SUPPORTED |
1393 |
/* The threshold on gamma processing is configurable but hard-wired into the |
|
1394 |
* library. The following is the floating point variant. |
|
1395 |
*/ |
|
1396 |
#define PNG_GAMMA_THRESHOLD (PNG_GAMMA_THRESHOLD_FIXED*.00001) |
|
2 | 1397 |
|
10576 | 1398 |
/* Handle gamma correction. Screen_gamma=(display_exponent). |
1399 |
* NOTE: this API simply sets the screen and file gamma values. It will |
|
1400 |
* therefore override the value for gamma in a PNG file if it is called after |
|
1401 |
* the file header has been read - use with care - call before reading the PNG |
|
1402 |
* file for best results! |
|
1403 |
* |
|
1404 |
* These routines accept the same gamma values as png_set_alpha_mode (described |
|
1405 |
* above). The PNG_GAMMA_ defines and PNG_DEFAULT_sRGB can be passed to either |
|
1406 |
* API (floating point or fixed.) Notice, however, that the 'file_gamma' value |
|
1407 |
* is the inverse of a 'screen gamma' value. |
|
1408 |
*/ |
|
29913 | 1409 |
PNG_FP_EXPORT(50, void, png_set_gamma, (png_structrp png_ptr, |
1410 |
double screen_gamma, double override_file_gamma)) |
|
1411 |
PNG_FIXED_EXPORT(208, void, png_set_gamma_fixed, (png_structrp png_ptr, |
|
1412 |
png_fixed_point screen_gamma, png_fixed_point override_file_gamma)) |
|
2 | 1413 |
#endif |
1414 |
||
10576 | 1415 |
#ifdef PNG_WRITE_FLUSH_SUPPORTED |
1416 |
/* Set how many lines between output flushes - 0 for no flushing */ |
|
29913 | 1417 |
PNG_EXPORT(51, void, png_set_flush, (png_structrp png_ptr, int nrows)); |
10576 | 1418 |
/* Flush the current PNG output buffer */ |
29913 | 1419 |
PNG_EXPORT(52, void, png_write_flush, (png_structrp png_ptr)); |
2 | 1420 |
#endif |
1421 |
||
10576 | 1422 |
/* Optional update palette with requested transformations */ |
29913 | 1423 |
PNG_EXPORT(53, void, png_start_read_image, (png_structrp png_ptr)); |
10576 | 1424 |
|
1425 |
/* Optional call to update the users info structure */ |
|
29913 | 1426 |
PNG_EXPORT(54, void, png_read_update_info, (png_structrp png_ptr, |
1427 |
png_inforp info_ptr)); |
|
10576 | 1428 |
|
1429 |
#ifdef PNG_SEQUENTIAL_READ_SUPPORTED |
|
1430 |
/* Read one or more rows of image data. */ |
|
29913 | 1431 |
PNG_EXPORT(55, void, png_read_rows, (png_structrp png_ptr, png_bytepp row, |
10576 | 1432 |
png_bytepp display_row, png_uint_32 num_rows)); |
2 | 1433 |
#endif |
1434 |
||
10576 | 1435 |
#ifdef PNG_SEQUENTIAL_READ_SUPPORTED |
1436 |
/* Read a row of data. */ |
|
29913 | 1437 |
PNG_EXPORT(56, void, png_read_row, (png_structrp png_ptr, png_bytep row, |
10576 | 1438 |
png_bytep display_row)); |
1439 |
#endif |
|
1440 |
||
1441 |
#ifdef PNG_SEQUENTIAL_READ_SUPPORTED |
|
1442 |
/* Read the whole image into memory at once. */ |
|
29913 | 1443 |
PNG_EXPORT(57, void, png_read_image, (png_structrp png_ptr, png_bytepp image)); |
2 | 1444 |
#endif |
1445 |
||
10576 | 1446 |
/* Write a row of image data */ |
29913 | 1447 |
PNG_EXPORT(58, void, png_write_row, (png_structrp png_ptr, |
1448 |
png_const_bytep row)); |
|
2 | 1449 |
|
10576 | 1450 |
/* Write a few rows of image data: (*row) is not written; however, the type |
1451 |
* is declared as writeable to maintain compatibility with previous versions |
|
1452 |
* of libpng and to allow the 'display_row' array from read_rows to be passed |
|
1453 |
* unchanged to write_rows. |
|
1454 |
*/ |
|
29913 | 1455 |
PNG_EXPORT(59, void, png_write_rows, (png_structrp png_ptr, png_bytepp row, |
10576 | 1456 |
png_uint_32 num_rows)); |
2 | 1457 |
|
10576 | 1458 |
/* Write the image data */ |
29913 | 1459 |
PNG_EXPORT(60, void, png_write_image, (png_structrp png_ptr, png_bytepp image)); |
2 | 1460 |
|
10576 | 1461 |
/* Write the end of the PNG file. */ |
29913 | 1462 |
PNG_EXPORT(61, void, png_write_end, (png_structrp png_ptr, |
1463 |
png_inforp info_ptr)); |
|
2 | 1464 |
|
10576 | 1465 |
#ifdef PNG_SEQUENTIAL_READ_SUPPORTED |
1466 |
/* Read the end of the PNG file. */ |
|
29913 | 1467 |
PNG_EXPORT(62, void, png_read_end, (png_structrp png_ptr, png_inforp info_ptr)); |
2 | 1468 |
#endif |
1469 |
||
10576 | 1470 |
/* Free any memory associated with the png_info_struct */ |
29913 | 1471 |
PNG_EXPORT(63, void, png_destroy_info_struct, (png_const_structrp png_ptr, |
10576 | 1472 |
png_infopp info_ptr_ptr)); |
2 | 1473 |
|
10576 | 1474 |
/* Free any memory associated with the png_struct and the png_info_structs */ |
1475 |
PNG_EXPORT(64, void, png_destroy_read_struct, (png_structpp png_ptr_ptr, |
|
1476 |
png_infopp info_ptr_ptr, png_infopp end_info_ptr_ptr)); |
|
2 | 1477 |
|
10576 | 1478 |
/* Free any memory associated with the png_struct and the png_info_structs */ |
1479 |
PNG_EXPORT(65, void, png_destroy_write_struct, (png_structpp png_ptr_ptr, |
|
1480 |
png_infopp info_ptr_ptr)); |
|
2 | 1481 |
|
10576 | 1482 |
/* Set the libpng method of handling chunk CRC errors */ |
29913 | 1483 |
PNG_EXPORT(66, void, png_set_crc_action, (png_structrp png_ptr, int crit_action, |
1484 |
int ancil_action)); |
|
2 | 1485 |
|
10576 | 1486 |
/* Values for png_set_crc_action() say how to handle CRC errors in |
2 | 1487 |
* ancillary and critical chunks, and whether to use the data contained |
1488 |
* therein. Note that it is impossible to "discard" data in a critical |
|
1489 |
* chunk. For versions prior to 0.90, the action was always error/quit, |
|
1490 |
* whereas in version 0.90 and later, the action for CRC errors in ancillary |
|
1491 |
* chunks is warn/discard. These values should NOT be changed. |
|
1492 |
* |
|
1493 |
* value action:critical action:ancillary |
|
1494 |
*/ |
|
1495 |
#define PNG_CRC_DEFAULT 0 /* error/quit warn/discard data */ |
|
1496 |
#define PNG_CRC_ERROR_QUIT 1 /* error/quit error/quit */ |
|
1497 |
#define PNG_CRC_WARN_DISCARD 2 /* (INVALID) warn/discard data */ |
|
1498 |
#define PNG_CRC_WARN_USE 3 /* warn/use data warn/use data */ |
|
1499 |
#define PNG_CRC_QUIET_USE 4 /* quiet/use data quiet/use data */ |
|
1500 |
#define PNG_CRC_NO_CHANGE 5 /* use current value use current value */ |
|
1501 |
||
35296 | 1502 |
#ifdef PNG_WRITE_SUPPORTED |
2 | 1503 |
/* These functions give the user control over the scan-line filtering in |
1504 |
* libpng and the compression methods used by zlib. These functions are |
|
1505 |
* mainly useful for testing, as the defaults should work with most users. |
|
1506 |
* Those users who are tight on memory or want faster performance at the |
|
1507 |
* expense of compression can modify them. See the compression library |
|
1508 |
* header file (zlib.h) for an explination of the compression functions. |
|
1509 |
*/ |
|
1510 |
||
10576 | 1511 |
/* Set the filtering method(s) used by libpng. Currently, the only valid |
2 | 1512 |
* value for "method" is 0. |
1513 |
*/ |
|
29913 | 1514 |
PNG_EXPORT(67, void, png_set_filter, (png_structrp png_ptr, int method, |
1515 |
int filters)); |
|
35296 | 1516 |
#endif /* WRITE */ |
2 | 1517 |
|
1518 |
/* Flags for png_set_filter() to say which filters to use. The flags |
|
1519 |
* are chosen so that they don't conflict with real filter types |
|
1520 |
* below, in case they are supplied instead of the #defined constants. |
|
1521 |
* These values should NOT be changed. |
|
1522 |
*/ |
|
1523 |
#define PNG_NO_FILTERS 0x00 |
|
1524 |
#define PNG_FILTER_NONE 0x08 |
|
1525 |
#define PNG_FILTER_SUB 0x10 |
|
1526 |
#define PNG_FILTER_UP 0x20 |
|
1527 |
#define PNG_FILTER_AVG 0x40 |
|
1528 |
#define PNG_FILTER_PAETH 0x80 |
|
40436
94ae0ede53a5
8155690: Update libPNG library to the latest up-to-date
azvegint
parents:
35296
diff
changeset
|
1529 |
#define PNG_FAST_FILTERS (PNG_FILTER_NONE | PNG_FILTER_SUB | PNG_FILTER_UP) |
94ae0ede53a5
8155690: Update libPNG library to the latest up-to-date
azvegint
parents:
35296
diff
changeset
|
1530 |
#define PNG_ALL_FILTERS (PNG_FAST_FILTERS | PNG_FILTER_AVG | PNG_FILTER_PAETH) |
2 | 1531 |
|
1532 |
/* Filter values (not flags) - used in pngwrite.c, pngwutil.c for now. |
|
1533 |
* These defines should NOT be changed. |
|
1534 |
*/ |
|
1535 |
#define PNG_FILTER_VALUE_NONE 0 |
|
1536 |
#define PNG_FILTER_VALUE_SUB 1 |
|
1537 |
#define PNG_FILTER_VALUE_UP 2 |
|
1538 |
#define PNG_FILTER_VALUE_AVG 3 |
|
1539 |
#define PNG_FILTER_VALUE_PAETH 4 |
|
1540 |
#define PNG_FILTER_VALUE_LAST 5 |
|
1541 |
||
35296 | 1542 |
#ifdef PNG_WRITE_SUPPORTED |
1543 |
#ifdef PNG_WRITE_WEIGHTED_FILTER_SUPPORTED /* DEPRECATED */ |
|
29913 | 1544 |
PNG_FP_EXPORT(68, void, png_set_filter_heuristics, (png_structrp png_ptr, |
10576 | 1545 |
int heuristic_method, int num_weights, png_const_doublep filter_weights, |
29913 | 1546 |
png_const_doublep filter_costs)) |
10576 | 1547 |
PNG_FIXED_EXPORT(209, void, png_set_filter_heuristics_fixed, |
29913 | 1548 |
(png_structrp png_ptr, int heuristic_method, int num_weights, |
1549 |
png_const_fixed_point_p filter_weights, |
|
1550 |
png_const_fixed_point_p filter_costs)) |
|
1551 |
#endif /* WRITE_WEIGHTED_FILTER */ |
|
2 | 1552 |
|
35296 | 1553 |
/* The following are no longer used and will be removed from libpng-1.7: */ |
2 | 1554 |
#define PNG_FILTER_HEURISTIC_DEFAULT 0 /* Currently "UNWEIGHTED" */ |
1555 |
#define PNG_FILTER_HEURISTIC_UNWEIGHTED 1 /* Used by libpng < 0.95 */ |
|
1556 |
#define PNG_FILTER_HEURISTIC_WEIGHTED 2 /* Experimental feature */ |
|
1557 |
#define PNG_FILTER_HEURISTIC_LAST 3 /* Not a valid value */ |
|
1558 |
||
1559 |
/* Set the library compression level. Currently, valid values range from |
|
1560 |
* 0 - 9, corresponding directly to the zlib compression levels 0 - 9 |
|
1561 |
* (0 - no compression, 9 - "maximal" compression). Note that tests have |
|
1562 |
* shown that zlib compression levels 3-6 usually perform as well as level 9 |
|
1563 |
* for PNG images, and do considerably fewer caclulations. In the future, |
|
1564 |
* these values may not correspond directly to the zlib compression levels. |
|
1565 |
*/ |
|
35296 | 1566 |
#ifdef PNG_WRITE_CUSTOMIZE_COMPRESSION_SUPPORTED |
29913 | 1567 |
PNG_EXPORT(69, void, png_set_compression_level, (png_structrp png_ptr, |
1568 |
int level)); |
|
1569 |
||
1570 |
PNG_EXPORT(70, void, png_set_compression_mem_level, (png_structrp png_ptr, |
|
10576 | 1571 |
int mem_level)); |
1572 |
||
29913 | 1573 |
PNG_EXPORT(71, void, png_set_compression_strategy, (png_structrp png_ptr, |
10576 | 1574 |
int strategy)); |
2 | 1575 |
|
10576 | 1576 |
/* If PNG_WRITE_OPTIMIZE_CMF_SUPPORTED is defined, libpng will use a |
1577 |
* smaller value of window_bits if it can do so safely. |
|
1578 |
*/ |
|
29913 | 1579 |
PNG_EXPORT(72, void, png_set_compression_window_bits, (png_structrp png_ptr, |
10576 | 1580 |
int window_bits)); |
1581 |
||
29913 | 1582 |
PNG_EXPORT(73, void, png_set_compression_method, (png_structrp png_ptr, |
10576 | 1583 |
int method)); |
35296 | 1584 |
#endif /* WRITE_CUSTOMIZE_COMPRESSION */ |
2 | 1585 |
|
10576 | 1586 |
#ifdef PNG_WRITE_CUSTOMIZE_ZTXT_COMPRESSION_SUPPORTED |
1587 |
/* Also set zlib parameters for compressing non-IDAT chunks */ |
|
29913 | 1588 |
PNG_EXPORT(222, void, png_set_text_compression_level, (png_structrp png_ptr, |
1589 |
int level)); |
|
1590 |
||
1591 |
PNG_EXPORT(223, void, png_set_text_compression_mem_level, (png_structrp png_ptr, |
|
10576 | 1592 |
int mem_level)); |
2 | 1593 |
|
29913 | 1594 |
PNG_EXPORT(224, void, png_set_text_compression_strategy, (png_structrp png_ptr, |
10576 | 1595 |
int strategy)); |
2 | 1596 |
|
10576 | 1597 |
/* If PNG_WRITE_OPTIMIZE_CMF_SUPPORTED is defined, libpng will use a |
1598 |
* smaller value of window_bits if it can do so safely. |
|
1599 |
*/ |
|
29913 | 1600 |
PNG_EXPORT(225, void, png_set_text_compression_window_bits, |
1601 |
(png_structrp png_ptr, int window_bits)); |
|
1602 |
||
1603 |
PNG_EXPORT(226, void, png_set_text_compression_method, (png_structrp png_ptr, |
|
10576 | 1604 |
int method)); |
29913 | 1605 |
#endif /* WRITE_CUSTOMIZE_ZTXT_COMPRESSION */ |
35296 | 1606 |
#endif /* WRITE */ |
2 | 1607 |
|
1608 |
/* These next functions are called for input/output, memory, and error |
|
1609 |
* handling. They are in the file pngrio.c, pngwio.c, and pngerror.c, |
|
1610 |
* and call standard C I/O routines such as fread(), fwrite(), and |
|
1611 |
* fprintf(). These functions can be made to use other I/O routines |
|
1612 |
* at run time for those applications that need to handle I/O in a |
|
10576 | 1613 |
* different manner by calling png_set_???_fn(). See libpng-manual.txt for |
2 | 1614 |
* more information. |
1615 |
*/ |
|
1616 |
||
10576 | 1617 |
#ifdef PNG_STDIO_SUPPORTED |
2 | 1618 |
/* Initialize the input/output for the PNG file to the default functions. */ |
29913 | 1619 |
PNG_EXPORT(74, void, png_init_io, (png_structrp png_ptr, png_FILE_p fp)); |
2 | 1620 |
#endif |
1621 |
||
1622 |
/* Replace the (error and abort), and warning functions with user |
|
1623 |
* supplied functions. If no messages are to be printed you must still |
|
1624 |
* write and use replacement functions. The replacement error_fn should |
|
1625 |
* still do a longjmp to the last setjmp location if you are using this |
|
1626 |
* method of error handling. If error_fn or warning_fn is NULL, the |
|
1627 |
* default function will be used. |
|
1628 |
*/ |
|
1629 |
||
29913 | 1630 |
PNG_EXPORT(75, void, png_set_error_fn, (png_structrp png_ptr, |
1631 |
png_voidp error_ptr, png_error_ptr error_fn, png_error_ptr warning_fn)); |
|
2 | 1632 |
|
1633 |
/* Return the user pointer associated with the error functions */ |
|
29913 | 1634 |
PNG_EXPORT(76, png_voidp, png_get_error_ptr, (png_const_structrp png_ptr)); |
2 | 1635 |
|
1636 |
/* Replace the default data output functions with a user supplied one(s). |
|
1637 |
* If buffered output is not used, then output_flush_fn can be set to NULL. |
|
1638 |
* If PNG_WRITE_FLUSH_SUPPORTED is not defined at libpng compile time |
|
1639 |
* output_flush_fn will be ignored (and thus can be NULL). |
|
10576 | 1640 |
* It is probably a mistake to use NULL for output_flush_fn if |
1641 |
* write_data_fn is not also NULL unless you have built libpng with |
|
1642 |
* PNG_WRITE_FLUSH_SUPPORTED undefined, because in this case libpng's |
|
1643 |
* default flush function, which uses the standard *FILE structure, will |
|
1644 |
* be used. |
|
2 | 1645 |
*/ |
29913 | 1646 |
PNG_EXPORT(77, void, png_set_write_fn, (png_structrp png_ptr, png_voidp io_ptr, |
10576 | 1647 |
png_rw_ptr write_data_fn, png_flush_ptr output_flush_fn)); |
2 | 1648 |
|
1649 |
/* Replace the default data input function with a user supplied one. */ |
|
29913 | 1650 |
PNG_EXPORT(78, void, png_set_read_fn, (png_structrp png_ptr, png_voidp io_ptr, |
10576 | 1651 |
png_rw_ptr read_data_fn)); |
2 | 1652 |
|
1653 |
/* Return the user pointer associated with the I/O functions */ |
|
29913 | 1654 |
PNG_EXPORT(79, png_voidp, png_get_io_ptr, (png_const_structrp png_ptr)); |
1655 |
||
1656 |
PNG_EXPORT(80, void, png_set_read_status_fn, (png_structrp png_ptr, |
|
10576 | 1657 |
png_read_status_ptr read_row_fn)); |
2 | 1658 |
|
29913 | 1659 |
PNG_EXPORT(81, void, png_set_write_status_fn, (png_structrp png_ptr, |
10576 | 1660 |
png_write_status_ptr write_row_fn)); |
2 | 1661 |
|
1662 |
#ifdef PNG_USER_MEM_SUPPORTED |
|
1663 |
/* Replace the default memory allocation functions with user supplied one(s). */ |
|
29913 | 1664 |
PNG_EXPORT(82, void, png_set_mem_fn, (png_structrp png_ptr, png_voidp mem_ptr, |
10576 | 1665 |
png_malloc_ptr malloc_fn, png_free_ptr free_fn)); |
2 | 1666 |
/* Return the user pointer associated with the memory functions */ |
29913 | 1667 |
PNG_EXPORT(83, png_voidp, png_get_mem_ptr, (png_const_structrp png_ptr)); |
2 | 1668 |
#endif |
1669 |
||
10576 | 1670 |
#ifdef PNG_READ_USER_TRANSFORM_SUPPORTED |
29913 | 1671 |
PNG_EXPORT(84, void, png_set_read_user_transform_fn, (png_structrp png_ptr, |
10576 | 1672 |
png_user_transform_ptr read_user_transform_fn)); |
1673 |
#endif |
|
1674 |
||
1675 |
#ifdef PNG_WRITE_USER_TRANSFORM_SUPPORTED |
|
29913 | 1676 |
PNG_EXPORT(85, void, png_set_write_user_transform_fn, (png_structrp png_ptr, |
10576 | 1677 |
png_user_transform_ptr write_user_transform_fn)); |
2 | 1678 |
#endif |
1679 |
||
10576 | 1680 |
#ifdef PNG_USER_TRANSFORM_PTR_SUPPORTED |
29913 | 1681 |
PNG_EXPORT(86, void, png_set_user_transform_info, (png_structrp png_ptr, |
10576 | 1682 |
png_voidp user_transform_ptr, int user_transform_depth, |
1683 |
int user_transform_channels)); |
|
1684 |
/* Return the user pointer associated with the user transform functions */ |
|
1685 |
PNG_EXPORT(87, png_voidp, png_get_user_transform_ptr, |
|
29913 | 1686 |
(png_const_structrp png_ptr)); |
2 | 1687 |
#endif |
1688 |
||
10576 | 1689 |
#ifdef PNG_USER_TRANSFORM_INFO_SUPPORTED |
1690 |
/* Return information about the row currently being processed. Note that these |
|
1691 |
* APIs do not fail but will return unexpected results if called outside a user |
|
1692 |
* transform callback. Also note that when transforming an interlaced image the |
|
1693 |
* row number is the row number within the sub-image of the interlace pass, so |
|
1694 |
* the value will increase to the height of the sub-image (not the full image) |
|
1695 |
* then reset to 0 for the next pass. |
|
1696 |
* |
|
1697 |
* Use PNG_ROW_FROM_PASS_ROW(row, pass) and PNG_COL_FROM_PASS_COL(col, pass) to |
|
1698 |
* find the output pixel (x,y) given an interlaced sub-image pixel |
|
1699 |
* (row,col,pass). (See below for these macros.) |
|
1700 |
*/ |
|
29913 | 1701 |
PNG_EXPORT(217, png_uint_32, png_get_current_row_number, (png_const_structrp)); |
1702 |
PNG_EXPORT(218, png_byte, png_get_current_pass_number, (png_const_structrp)); |
|
1703 |
#endif |
|
1704 |
||
1705 |
#ifdef PNG_READ_USER_CHUNKS_SUPPORTED |
|
1706 |
/* This callback is called only for *unknown* chunks. If |
|
1707 |
* PNG_HANDLE_AS_UNKNOWN_SUPPORTED is set then it is possible to set known |
|
1708 |
* chunks to be treated as unknown, however in this case the callback must do |
|
1709 |
* any processing required by the chunk (e.g. by calling the appropriate |
|
1710 |
* png_set_ APIs.) |
|
1711 |
* |
|
1712 |
* There is no write support - on write, by default, all the chunks in the |
|
1713 |
* 'unknown' list are written in the specified position. |
|
1714 |
* |
|
1715 |
* The integer return from the callback function is interpreted thus: |
|
1716 |
* |
|
35296 | 1717 |
* negative: An error occurred; png_chunk_error will be called. |
29913 | 1718 |
* zero: The chunk was not handled, the chunk will be saved. A critical |
1719 |
* chunk will cause an error at this point unless it is to be saved. |
|
1720 |
* positive: The chunk was handled, libpng will ignore/discard it. |
|
1721 |
* |
|
1722 |
* See "INTERACTION WTIH USER CHUNK CALLBACKS" below for important notes about |
|
1723 |
* how this behavior will change in libpng 1.7 |
|
1724 |
*/ |
|
1725 |
PNG_EXPORT(88, void, png_set_read_user_chunk_fn, (png_structrp png_ptr, |
|
1726 |
png_voidp user_chunk_ptr, png_user_chunk_ptr read_user_chunk_fn)); |
|
2 | 1727 |
#endif |
1728 |
||
1729 |
#ifdef PNG_USER_CHUNKS_SUPPORTED |
|
29913 | 1730 |
PNG_EXPORT(89, png_voidp, png_get_user_chunk_ptr, (png_const_structrp png_ptr)); |
2 | 1731 |
#endif |
1732 |
||
1733 |
#ifdef PNG_PROGRESSIVE_READ_SUPPORTED |
|
1734 |
/* Sets the function callbacks for the push reader, and a pointer to a |
|
1735 |
* user-defined structure available to the callback functions. |
|
1736 |
*/ |
|
29913 | 1737 |
PNG_EXPORT(90, void, png_set_progressive_read_fn, (png_structrp png_ptr, |
10576 | 1738 |
png_voidp progressive_ptr, png_progressive_info_ptr info_fn, |
1739 |
png_progressive_row_ptr row_fn, png_progressive_end_ptr end_fn)); |
|
2 | 1740 |
|
10576 | 1741 |
/* Returns the user pointer associated with the push read functions */ |
29913 | 1742 |
PNG_EXPORT(91, png_voidp, png_get_progressive_ptr, |
1743 |
(png_const_structrp png_ptr)); |
|
10576 | 1744 |
|
1745 |
/* Function to be called when data becomes available */ |
|
29913 | 1746 |
PNG_EXPORT(92, void, png_process_data, (png_structrp png_ptr, |
1747 |
png_inforp info_ptr, png_bytep buffer, png_size_t buffer_size)); |
|
2 | 1748 |
|
10576 | 1749 |
/* A function which may be called *only* within png_process_data to stop the |
1750 |
* processing of any more data. The function returns the number of bytes |
|
1751 |
* remaining, excluding any that libpng has cached internally. A subsequent |
|
1752 |
* call to png_process_data must supply these bytes again. If the argument |
|
1753 |
* 'save' is set to true the routine will first save all the pending data and |
|
1754 |
* will always return 0. |
|
1755 |
*/ |
|
29913 | 1756 |
PNG_EXPORT(219, png_size_t, png_process_data_pause, (png_structrp, int save)); |
2 | 1757 |
|
10576 | 1758 |
/* A function which may be called *only* outside (after) a call to |
1759 |
* png_process_data. It returns the number of bytes of data to skip in the |
|
1760 |
* input. Normally it will return 0, but if it returns a non-zero value the |
|
1761 |
* application must skip than number of bytes of input data and pass the |
|
1762 |
* following data to the next call to png_process_data. |
|
2 | 1763 |
*/ |
29913 | 1764 |
PNG_EXPORT(220, png_uint_32, png_process_data_skip, (png_structrp)); |
10576 | 1765 |
|
1766 |
/* Function that combines rows. 'new_row' is a flag that should come from |
|
1767 |
* the callback and be non-NULL if anything needs to be done; the library |
|
1768 |
* stores its own version of the new data internally and ignores the passed |
|
1769 |
* in value. |
|
1770 |
*/ |
|
29913 | 1771 |
PNG_EXPORT(93, void, png_progressive_combine_row, (png_const_structrp png_ptr, |
10576 | 1772 |
png_bytep old_row, png_const_bytep new_row)); |
29913 | 1773 |
#endif /* PROGRESSIVE_READ */ |
1774 |
||
1775 |
PNG_EXPORTA(94, png_voidp, png_malloc, (png_const_structrp png_ptr, |
|
1776 |
png_alloc_size_t size), PNG_ALLOCATED); |
|
10576 | 1777 |
/* Added at libpng version 1.4.0 */ |
29913 | 1778 |
PNG_EXPORTA(95, png_voidp, png_calloc, (png_const_structrp png_ptr, |
1779 |
png_alloc_size_t size), PNG_ALLOCATED); |
|
2 | 1780 |
|
10576 | 1781 |
/* Added at libpng version 1.2.4 */ |
29913 | 1782 |
PNG_EXPORTA(96, png_voidp, png_malloc_warn, (png_const_structrp png_ptr, |
10576 | 1783 |
png_alloc_size_t size), PNG_ALLOCATED); |
2 | 1784 |
|
10576 | 1785 |
/* Frees a pointer allocated by png_malloc() */ |
29913 | 1786 |
PNG_EXPORT(97, void, png_free, (png_const_structrp png_ptr, png_voidp ptr)); |
2 | 1787 |
|
1788 |
/* Free data that was allocated internally */ |
|
29913 | 1789 |
PNG_EXPORT(98, void, png_free_data, (png_const_structrp png_ptr, |
1790 |
png_inforp info_ptr, png_uint_32 free_me, int num)); |
|
10576 | 1791 |
|
2 | 1792 |
/* Reassign responsibility for freeing existing data, whether allocated |
29913 | 1793 |
* by libpng or by the application; this works on the png_info structure passed |
1794 |
* in, it does not change the state for other png_info structures. |
|
1795 |
* |
|
1796 |
* It is unlikely that this function works correctly as of 1.6.0 and using it |
|
1797 |
* may result either in memory leaks or double free of allocated data. |
|
1798 |
*/ |
|
1799 |
PNG_EXPORT(99, void, png_data_freer, (png_const_structrp png_ptr, |
|
1800 |
png_inforp info_ptr, int freer, png_uint_32 mask)); |
|
10576 | 1801 |
|
1802 |
/* Assignments for png_data_freer */ |
|
2 | 1803 |
#define PNG_DESTROY_WILL_FREE_DATA 1 |
1804 |
#define PNG_SET_WILL_FREE_DATA 1 |
|
1805 |
#define PNG_USER_WILL_FREE_DATA 2 |
|
1806 |
/* Flags for png_ptr->free_me and info_ptr->free_me */ |
|
40436
94ae0ede53a5
8155690: Update libPNG library to the latest up-to-date
azvegint
parents:
35296
diff
changeset
|
1807 |
#define PNG_FREE_HIST 0x0008U |
94ae0ede53a5
8155690: Update libPNG library to the latest up-to-date
azvegint
parents:
35296
diff
changeset
|
1808 |
#define PNG_FREE_ICCP 0x0010U |
94ae0ede53a5
8155690: Update libPNG library to the latest up-to-date
azvegint
parents:
35296
diff
changeset
|
1809 |
#define PNG_FREE_SPLT 0x0020U |
94ae0ede53a5
8155690: Update libPNG library to the latest up-to-date
azvegint
parents:
35296
diff
changeset
|
1810 |
#define PNG_FREE_ROWS 0x0040U |
94ae0ede53a5
8155690: Update libPNG library to the latest up-to-date
azvegint
parents:
35296
diff
changeset
|
1811 |
#define PNG_FREE_PCAL 0x0080U |
94ae0ede53a5
8155690: Update libPNG library to the latest up-to-date
azvegint
parents:
35296
diff
changeset
|
1812 |
#define PNG_FREE_SCAL 0x0100U |
29913 | 1813 |
#ifdef PNG_STORE_UNKNOWN_CHUNKS_SUPPORTED |
40436
94ae0ede53a5
8155690: Update libPNG library to the latest up-to-date
azvegint
parents:
35296
diff
changeset
|
1814 |
# define PNG_FREE_UNKN 0x0200U |
29913 | 1815 |
#endif |
40436
94ae0ede53a5
8155690: Update libPNG library to the latest up-to-date
azvegint
parents:
35296
diff
changeset
|
1816 |
/* PNG_FREE_LIST 0x0400U removed in 1.6.0 because it is ignored */ |
94ae0ede53a5
8155690: Update libPNG library to the latest up-to-date
azvegint
parents:
35296
diff
changeset
|
1817 |
#define PNG_FREE_PLTE 0x1000U |
94ae0ede53a5
8155690: Update libPNG library to the latest up-to-date
azvegint
parents:
35296
diff
changeset
|
1818 |
#define PNG_FREE_TRNS 0x2000U |
94ae0ede53a5
8155690: Update libPNG library to the latest up-to-date
azvegint
parents:
35296
diff
changeset
|
1819 |
#define PNG_FREE_TEXT 0x4000U |
48280 | 1820 |
#define PNG_FREE_EXIF 0x8000U /* Added at libpng-1.6.31 */ |
1821 |
#define PNG_FREE_ALL 0xffffU |
|
40436
94ae0ede53a5
8155690: Update libPNG library to the latest up-to-date
azvegint
parents:
35296
diff
changeset
|
1822 |
#define PNG_FREE_MUL 0x4220U /* PNG_FREE_SPLT|PNG_FREE_TEXT|PNG_FREE_UNKN */ |
2 | 1823 |
|
1824 |
#ifdef PNG_USER_MEM_SUPPORTED |
|
29913 | 1825 |
PNG_EXPORTA(100, png_voidp, png_malloc_default, (png_const_structrp png_ptr, |
1826 |
png_alloc_size_t size), PNG_ALLOCATED PNG_DEPRECATED); |
|
1827 |
PNG_EXPORTA(101, void, png_free_default, (png_const_structrp png_ptr, |
|
1828 |
png_voidp ptr), PNG_DEPRECATED); |
|
10576 | 1829 |
#endif |
1830 |
||
1831 |
#ifdef PNG_ERROR_TEXT_SUPPORTED |
|
1832 |
/* Fatal error in PNG image of libpng - can't continue */ |
|
29913 | 1833 |
PNG_EXPORTA(102, void, png_error, (png_const_structrp png_ptr, |
1834 |
png_const_charp error_message), PNG_NORETURN); |
|
10576 | 1835 |
|
1836 |
/* The same, but the chunk name is prepended to the error string. */ |
|
29913 | 1837 |
PNG_EXPORTA(103, void, png_chunk_error, (png_const_structrp png_ptr, |
10576 | 1838 |
png_const_charp error_message), PNG_NORETURN); |
1839 |
||
1840 |
#else |
|
1841 |
/* Fatal error in PNG image of libpng - can't continue */ |
|
29913 | 1842 |
PNG_EXPORTA(104, void, png_err, (png_const_structrp png_ptr), PNG_NORETURN); |
1843 |
# define png_error(s1,s2) png_err(s1) |
|
1844 |
# define png_chunk_error(s1,s2) png_err(s1) |
|
2 | 1845 |
#endif |
1846 |
||
10576 | 1847 |
#ifdef PNG_WARNINGS_SUPPORTED |
2 | 1848 |
/* Non-fatal error in libpng. Can continue, but may have a problem. */ |
29913 | 1849 |
PNG_EXPORT(105, void, png_warning, (png_const_structrp png_ptr, |
10576 | 1850 |
png_const_charp warning_message)); |
2 | 1851 |
|
1852 |
/* Non-fatal error in libpng, chunk name is prepended to message. */ |
|
29913 | 1853 |
PNG_EXPORT(106, void, png_chunk_warning, (png_const_structrp png_ptr, |
10576 | 1854 |
png_const_charp warning_message)); |
29913 | 1855 |
#else |
1856 |
# define png_warning(s1,s2) ((void)(s1)) |
|
1857 |
# define png_chunk_warning(s1,s2) ((void)(s1)) |
|
10576 | 1858 |
#endif |
1859 |
||
1860 |
#ifdef PNG_BENIGN_ERRORS_SUPPORTED |
|
1861 |
/* Benign error in libpng. Can continue, but may have a problem. |
|
1862 |
* User can choose whether to handle as a fatal error or as a warning. */ |
|
29913 | 1863 |
PNG_EXPORT(107, void, png_benign_error, (png_const_structrp png_ptr, |
10576 | 1864 |
png_const_charp warning_message)); |
1865 |
||
29913 | 1866 |
#ifdef PNG_READ_SUPPORTED |
1867 |
/* Same, chunk name is prepended to message (only during read) */ |
|
1868 |
PNG_EXPORT(108, void, png_chunk_benign_error, (png_const_structrp png_ptr, |
|
10576 | 1869 |
png_const_charp warning_message)); |
29913 | 1870 |
#endif |
10576 | 1871 |
|
1872 |
PNG_EXPORT(109, void, png_set_benign_errors, |
|
29913 | 1873 |
(png_structrp png_ptr, int allowed)); |
10576 | 1874 |
#else |
1875 |
# ifdef PNG_ALLOW_BENIGN_ERRORS |
|
1876 |
# define png_benign_error png_warning |
|
1877 |
# define png_chunk_benign_error png_chunk_warning |
|
1878 |
# else |
|
1879 |
# define png_benign_error png_error |
|
1880 |
# define png_chunk_benign_error png_chunk_error |
|
1881 |
# endif |
|
1882 |
#endif |
|
2 | 1883 |
|
1884 |
/* The png_set_<chunk> functions are for storing values in the png_info_struct. |
|
1885 |
* Similarly, the png_get_<chunk> calls are used to read values from the |
|
1886 |
* png_info_struct, either storing the parameters in the passed variables, or |
|
1887 |
* setting pointers into the png_info_struct where the data is stored. The |
|
1888 |
* png_get_<chunk> functions return a non-zero value if the data was available |
|
1889 |
* in info_ptr, or return zero and do not change any of the parameters if the |
|
1890 |
* data was not available. |
|
1891 |
* |
|
1892 |
* These functions should be used instead of directly accessing png_info |
|
1893 |
* to avoid problems with future changes in the size and internal layout of |
|
1894 |
* png_info_struct. |
|
1895 |
*/ |
|
1896 |
/* Returns "flag" if chunk data is valid in info_ptr. */ |
|
29913 | 1897 |
PNG_EXPORT(110, png_uint_32, png_get_valid, (png_const_structrp png_ptr, |
1898 |
png_const_inforp info_ptr, png_uint_32 flag)); |
|
2 | 1899 |
|
1900 |
/* Returns number of bytes needed to hold a transformed row. */ |
|
29913 | 1901 |
PNG_EXPORT(111, png_size_t, png_get_rowbytes, (png_const_structrp png_ptr, |
1902 |
png_const_inforp info_ptr)); |
|
2 | 1903 |
|
10576 | 1904 |
#ifdef PNG_INFO_IMAGE_SUPPORTED |
2 | 1905 |
/* Returns row_pointers, which is an array of pointers to scanlines that was |
10576 | 1906 |
* returned from png_read_png(). |
1907 |
*/ |
|
29913 | 1908 |
PNG_EXPORT(112, png_bytepp, png_get_rows, (png_const_structrp png_ptr, |
1909 |
png_const_inforp info_ptr)); |
|
1910 |
||
2 | 1911 |
/* Set row_pointers, which is an array of pointers to scanlines for use |
10576 | 1912 |
* by png_write_png(). |
1913 |
*/ |
|
29913 | 1914 |
PNG_EXPORT(113, void, png_set_rows, (png_const_structrp png_ptr, |
1915 |
png_inforp info_ptr, png_bytepp row_pointers)); |
|
2 | 1916 |
#endif |
1917 |
||
1918 |
/* Returns number of color channels in image. */ |
|
29913 | 1919 |
PNG_EXPORT(114, png_byte, png_get_channels, (png_const_structrp png_ptr, |
1920 |
png_const_inforp info_ptr)); |
|
2 | 1921 |
|
1922 |
#ifdef PNG_EASY_ACCESS_SUPPORTED |
|
1923 |
/* Returns image width in pixels. */ |
|
29913 | 1924 |
PNG_EXPORT(115, png_uint_32, png_get_image_width, (png_const_structrp png_ptr, |
1925 |
png_const_inforp info_ptr)); |
|
2 | 1926 |
|
1927 |
/* Returns image height in pixels. */ |
|
29913 | 1928 |
PNG_EXPORT(116, png_uint_32, png_get_image_height, (png_const_structrp png_ptr, |
1929 |
png_const_inforp info_ptr)); |
|
2 | 1930 |
|
1931 |
/* Returns image bit_depth. */ |
|
29913 | 1932 |
PNG_EXPORT(117, png_byte, png_get_bit_depth, (png_const_structrp png_ptr, |
1933 |
png_const_inforp info_ptr)); |
|
2 | 1934 |
|
1935 |
/* Returns image color_type. */ |
|
29913 | 1936 |
PNG_EXPORT(118, png_byte, png_get_color_type, (png_const_structrp png_ptr, |
1937 |
png_const_inforp info_ptr)); |
|
2 | 1938 |
|
1939 |
/* Returns image filter_type. */ |
|
29913 | 1940 |
PNG_EXPORT(119, png_byte, png_get_filter_type, (png_const_structrp png_ptr, |
1941 |
png_const_inforp info_ptr)); |
|
2 | 1942 |
|
1943 |
/* Returns image interlace_type. */ |
|
29913 | 1944 |
PNG_EXPORT(120, png_byte, png_get_interlace_type, (png_const_structrp png_ptr, |
1945 |
png_const_inforp info_ptr)); |
|
2 | 1946 |
|
1947 |
/* Returns image compression_type. */ |
|
29913 | 1948 |
PNG_EXPORT(121, png_byte, png_get_compression_type, (png_const_structrp png_ptr, |
1949 |
png_const_inforp info_ptr)); |
|
2 | 1950 |
|
1951 |
/* Returns image resolution in pixels per meter, from pHYs chunk data. */ |
|
10576 | 1952 |
PNG_EXPORT(122, png_uint_32, png_get_pixels_per_meter, |
29913 | 1953 |
(png_const_structrp png_ptr, png_const_inforp info_ptr)); |
10576 | 1954 |
PNG_EXPORT(123, png_uint_32, png_get_x_pixels_per_meter, |
29913 | 1955 |
(png_const_structrp png_ptr, png_const_inforp info_ptr)); |
10576 | 1956 |
PNG_EXPORT(124, png_uint_32, png_get_y_pixels_per_meter, |
29913 | 1957 |
(png_const_structrp png_ptr, png_const_inforp info_ptr)); |
2 | 1958 |
|
1959 |
/* Returns pixel aspect ratio, computed from pHYs chunk data. */ |
|
10576 | 1960 |
PNG_FP_EXPORT(125, float, png_get_pixel_aspect_ratio, |
29913 | 1961 |
(png_const_structrp png_ptr, png_const_inforp info_ptr)) |
10576 | 1962 |
PNG_FIXED_EXPORT(210, png_fixed_point, png_get_pixel_aspect_ratio_fixed, |
29913 | 1963 |
(png_const_structrp png_ptr, png_const_inforp info_ptr)) |
2 | 1964 |
|
1965 |
/* Returns image x, y offset in pixels or microns, from oFFs chunk data. */ |
|
10576 | 1966 |
PNG_EXPORT(126, png_int_32, png_get_x_offset_pixels, |
29913 | 1967 |
(png_const_structrp png_ptr, png_const_inforp info_ptr)); |
10576 | 1968 |
PNG_EXPORT(127, png_int_32, png_get_y_offset_pixels, |
29913 | 1969 |
(png_const_structrp png_ptr, png_const_inforp info_ptr)); |
10576 | 1970 |
PNG_EXPORT(128, png_int_32, png_get_x_offset_microns, |
29913 | 1971 |
(png_const_structrp png_ptr, png_const_inforp info_ptr)); |
10576 | 1972 |
PNG_EXPORT(129, png_int_32, png_get_y_offset_microns, |
29913 | 1973 |
(png_const_structrp png_ptr, png_const_inforp info_ptr)); |
1974 |
||
1975 |
#endif /* EASY_ACCESS */ |
|
1976 |
||
1977 |
#ifdef PNG_READ_SUPPORTED |
|
2 | 1978 |
/* Returns pointer to signature string read from PNG header */ |
29913 | 1979 |
PNG_EXPORT(130, png_const_bytep, png_get_signature, (png_const_structrp png_ptr, |
1980 |
png_const_inforp info_ptr)); |
|
2 | 1981 |
#endif |
1982 |
||
10576 | 1983 |
#ifdef PNG_bKGD_SUPPORTED |
29913 | 1984 |
PNG_EXPORT(131, png_uint_32, png_get_bKGD, (png_const_structrp png_ptr, |
1985 |
png_inforp info_ptr, png_color_16p *background)); |
|
1986 |
#endif |
|
1987 |
||
1988 |
#ifdef PNG_bKGD_SUPPORTED |
|
1989 |
PNG_EXPORT(132, void, png_set_bKGD, (png_const_structrp png_ptr, |
|
1990 |
png_inforp info_ptr, png_const_color_16p background)); |
|
2 | 1991 |
#endif |
1992 |
||
10576 | 1993 |
#ifdef PNG_cHRM_SUPPORTED |
29913 | 1994 |
PNG_FP_EXPORT(133, png_uint_32, png_get_cHRM, (png_const_structrp png_ptr, |
1995 |
png_const_inforp info_ptr, double *white_x, double *white_y, double *red_x, |
|
10576 | 1996 |
double *red_y, double *green_x, double *green_y, double *blue_x, |
29913 | 1997 |
double *blue_y)) |
1998 |
PNG_FP_EXPORT(230, png_uint_32, png_get_cHRM_XYZ, (png_const_structrp png_ptr, |
|
1999 |
png_const_inforp info_ptr, double *red_X, double *red_Y, double *red_Z, |
|
2000 |
double *green_X, double *green_Y, double *green_Z, double *blue_X, |
|
2001 |
double *blue_Y, double *blue_Z)) |
|
10576 | 2002 |
PNG_FIXED_EXPORT(134, png_uint_32, png_get_cHRM_fixed, |
29913 | 2003 |
(png_const_structrp png_ptr, png_const_inforp info_ptr, |
2004 |
png_fixed_point *int_white_x, png_fixed_point *int_white_y, |
|
2005 |
png_fixed_point *int_red_x, png_fixed_point *int_red_y, |
|
2006 |
png_fixed_point *int_green_x, png_fixed_point *int_green_y, |
|
2007 |
png_fixed_point *int_blue_x, png_fixed_point *int_blue_y)) |
|
2008 |
PNG_FIXED_EXPORT(231, png_uint_32, png_get_cHRM_XYZ_fixed, |
|
2009 |
(png_const_structrp png_ptr, png_const_inforp info_ptr, |
|
2010 |
png_fixed_point *int_red_X, png_fixed_point *int_red_Y, |
|
2011 |
png_fixed_point *int_red_Z, png_fixed_point *int_green_X, |
|
2012 |
png_fixed_point *int_green_Y, png_fixed_point *int_green_Z, |
|
2013 |
png_fixed_point *int_blue_X, png_fixed_point *int_blue_Y, |
|
2014 |
png_fixed_point *int_blue_Z)) |
|
2 | 2015 |
#endif |
2016 |
||
10576 | 2017 |
#ifdef PNG_cHRM_SUPPORTED |
29913 | 2018 |
PNG_FP_EXPORT(135, void, png_set_cHRM, (png_const_structrp png_ptr, |
2019 |
png_inforp info_ptr, |
|
10576 | 2020 |
double white_x, double white_y, double red_x, double red_y, double green_x, |
29913 | 2021 |
double green_y, double blue_x, double blue_y)) |
2022 |
PNG_FP_EXPORT(232, void, png_set_cHRM_XYZ, (png_const_structrp png_ptr, |
|
2023 |
png_inforp info_ptr, double red_X, double red_Y, double red_Z, |
|
2024 |
double green_X, double green_Y, double green_Z, double blue_X, |
|
2025 |
double blue_Y, double blue_Z)) |
|
2026 |
PNG_FIXED_EXPORT(136, void, png_set_cHRM_fixed, (png_const_structrp png_ptr, |
|
2027 |
png_inforp info_ptr, png_fixed_point int_white_x, |
|
10576 | 2028 |
png_fixed_point int_white_y, png_fixed_point int_red_x, |
2029 |
png_fixed_point int_red_y, png_fixed_point int_green_x, |
|
2030 |
png_fixed_point int_green_y, png_fixed_point int_blue_x, |
|
29913 | 2031 |
png_fixed_point int_blue_y)) |
2032 |
PNG_FIXED_EXPORT(233, void, png_set_cHRM_XYZ_fixed, (png_const_structrp png_ptr, |
|
2033 |
png_inforp info_ptr, png_fixed_point int_red_X, png_fixed_point int_red_Y, |
|
2034 |
png_fixed_point int_red_Z, png_fixed_point int_green_X, |
|
2035 |
png_fixed_point int_green_Y, png_fixed_point int_green_Z, |
|
2036 |
png_fixed_point int_blue_X, png_fixed_point int_blue_Y, |
|
2037 |
png_fixed_point int_blue_Z)) |
|
2 | 2038 |
#endif |
2039 |
||
48280 | 2040 |
#ifdef PNG_eXIf_SUPPORTED |
2041 |
PNG_EXPORT(246, png_uint_32, png_get_eXIf, (png_const_structrp png_ptr, |
|
2042 |
png_inforp info_ptr, png_bytep *exif)); |
|
2043 |
PNG_EXPORT(247, void, png_set_eXIf, (png_const_structrp png_ptr, |
|
2044 |
png_inforp info_ptr, const png_bytep exif)); |
|
2045 |
||
2046 |
PNG_EXPORT(248, png_uint_32, png_get_eXIf_1, (png_const_structrp png_ptr, |
|
2047 |
png_const_inforp info_ptr, png_uint_32 *num_exif, png_bytep *exif)); |
|
2048 |
PNG_EXPORT(249, void, png_set_eXIf_1, (png_const_structrp png_ptr, |
|
2049 |
png_inforp info_ptr, const png_uint_32 num_exif, const png_bytep exif)); |
|
2050 |
#endif |
|
2051 |
||
10576 | 2052 |
#ifdef PNG_gAMA_SUPPORTED |
29913 | 2053 |
PNG_FP_EXPORT(137, png_uint_32, png_get_gAMA, (png_const_structrp png_ptr, |
2054 |
png_const_inforp info_ptr, double *file_gamma)) |
|
2055 |
PNG_FIXED_EXPORT(138, png_uint_32, png_get_gAMA_fixed, |
|
2056 |
(png_const_structrp png_ptr, png_const_inforp info_ptr, |
|
2057 |
png_fixed_point *int_file_gamma)) |
|
2058 |
#endif |
|
2059 |
||
2060 |
#ifdef PNG_gAMA_SUPPORTED |
|
2061 |
PNG_FP_EXPORT(139, void, png_set_gAMA, (png_const_structrp png_ptr, |
|
2062 |
png_inforp info_ptr, double file_gamma)) |
|
2063 |
PNG_FIXED_EXPORT(140, void, png_set_gAMA_fixed, (png_const_structrp png_ptr, |
|
2064 |
png_inforp info_ptr, png_fixed_point int_file_gamma)) |
|
10576 | 2065 |
#endif |
2 | 2066 |
|
10576 | 2067 |
#ifdef PNG_hIST_SUPPORTED |
29913 | 2068 |
PNG_EXPORT(141, png_uint_32, png_get_hIST, (png_const_structrp png_ptr, |
2069 |
png_inforp info_ptr, png_uint_16p *hist)); |
|
2070 |
PNG_EXPORT(142, void, png_set_hIST, (png_const_structrp png_ptr, |
|
2071 |
png_inforp info_ptr, png_const_uint_16p hist)); |
|
2 | 2072 |
#endif |
2073 |
||
29913 | 2074 |
PNG_EXPORT(143, png_uint_32, png_get_IHDR, (png_const_structrp png_ptr, |
2075 |
png_const_inforp info_ptr, png_uint_32 *width, png_uint_32 *height, |
|
2076 |
int *bit_depth, int *color_type, int *interlace_method, |
|
2077 |
int *compression_method, int *filter_method)); |
|
2078 |
||
2079 |
PNG_EXPORT(144, void, png_set_IHDR, (png_const_structrp png_ptr, |
|
2080 |
png_inforp info_ptr, png_uint_32 width, png_uint_32 height, int bit_depth, |
|
2081 |
int color_type, int interlace_method, int compression_method, |
|
2082 |
int filter_method)); |
|
10576 | 2083 |
|
2084 |
#ifdef PNG_oFFs_SUPPORTED |
|
29913 | 2085 |
PNG_EXPORT(145, png_uint_32, png_get_oFFs, (png_const_structrp png_ptr, |
2086 |
png_const_inforp info_ptr, png_int_32 *offset_x, png_int_32 *offset_y, |
|
2087 |
int *unit_type)); |
|
2 | 2088 |
#endif |
2089 |
||
10576 | 2090 |
#ifdef PNG_oFFs_SUPPORTED |
29913 | 2091 |
PNG_EXPORT(146, void, png_set_oFFs, (png_const_structrp png_ptr, |
2092 |
png_inforp info_ptr, png_int_32 offset_x, png_int_32 offset_y, |
|
2093 |
int unit_type)); |
|
2 | 2094 |
#endif |
2095 |
||
10576 | 2096 |
#ifdef PNG_pCAL_SUPPORTED |
29913 | 2097 |
PNG_EXPORT(147, png_uint_32, png_get_pCAL, (png_const_structrp png_ptr, |
2098 |
png_inforp info_ptr, png_charp *purpose, png_int_32 *X0, |
|
2099 |
png_int_32 *X1, int *type, int *nparams, png_charp *units, |
|
2100 |
png_charpp *params)); |
|
2 | 2101 |
#endif |
2102 |
||
10576 | 2103 |
#ifdef PNG_pCAL_SUPPORTED |
29913 | 2104 |
PNG_EXPORT(148, void, png_set_pCAL, (png_const_structrp png_ptr, |
2105 |
png_inforp info_ptr, png_const_charp purpose, png_int_32 X0, png_int_32 X1, |
|
2106 |
int type, int nparams, png_const_charp units, png_charpp params)); |
|
2 | 2107 |
#endif |
2108 |
||
10576 | 2109 |
#ifdef PNG_pHYs_SUPPORTED |
29913 | 2110 |
PNG_EXPORT(149, png_uint_32, png_get_pHYs, (png_const_structrp png_ptr, |
2111 |
png_const_inforp info_ptr, png_uint_32 *res_x, png_uint_32 *res_y, |
|
2112 |
int *unit_type)); |
|
2 | 2113 |
#endif |
2114 |
||
29913 | 2115 |
#ifdef PNG_pHYs_SUPPORTED |
2116 |
PNG_EXPORT(150, void, png_set_pHYs, (png_const_structrp png_ptr, |
|
2117 |
png_inforp info_ptr, png_uint_32 res_x, png_uint_32 res_y, int unit_type)); |
|
2118 |
#endif |
|
2119 |
||
2120 |
PNG_EXPORT(151, png_uint_32, png_get_PLTE, (png_const_structrp png_ptr, |
|
2121 |
png_inforp info_ptr, png_colorp *palette, int *num_palette)); |
|
2122 |
||
2123 |
PNG_EXPORT(152, void, png_set_PLTE, (png_structrp png_ptr, |
|
2124 |
png_inforp info_ptr, png_const_colorp palette, int num_palette)); |
|
10576 | 2125 |
|
2126 |
#ifdef PNG_sBIT_SUPPORTED |
|
29913 | 2127 |
PNG_EXPORT(153, png_uint_32, png_get_sBIT, (png_const_structrp png_ptr, |
2128 |
png_inforp info_ptr, png_color_8p *sig_bit)); |
|
2 | 2129 |
#endif |
2130 |
||
10576 | 2131 |
#ifdef PNG_sBIT_SUPPORTED |
29913 | 2132 |
PNG_EXPORT(154, void, png_set_sBIT, (png_const_structrp png_ptr, |
2133 |
png_inforp info_ptr, png_const_color_8p sig_bit)); |
|
2 | 2134 |
#endif |
2135 |
||
10576 | 2136 |
#ifdef PNG_sRGB_SUPPORTED |
29913 | 2137 |
PNG_EXPORT(155, png_uint_32, png_get_sRGB, (png_const_structrp png_ptr, |
2138 |
png_const_inforp info_ptr, int *file_srgb_intent)); |
|
2 | 2139 |
#endif |
2140 |
||
29913 | 2141 |
#ifdef PNG_sRGB_SUPPORTED |
2142 |
PNG_EXPORT(156, void, png_set_sRGB, (png_const_structrp png_ptr, |
|
2143 |
png_inforp info_ptr, int srgb_intent)); |
|
2144 |
PNG_EXPORT(157, void, png_set_sRGB_gAMA_and_cHRM, (png_const_structrp png_ptr, |
|
2145 |
png_inforp info_ptr, int srgb_intent)); |
|
2 | 2146 |
#endif |
2147 |
||
10576 | 2148 |
#ifdef PNG_iCCP_SUPPORTED |
29913 | 2149 |
PNG_EXPORT(158, png_uint_32, png_get_iCCP, (png_const_structrp png_ptr, |
2150 |
png_inforp info_ptr, png_charpp name, int *compression_type, |
|
2151 |
png_bytepp profile, png_uint_32 *proflen)); |
|
2152 |
#endif |
|
2153 |
||
2154 |
#ifdef PNG_iCCP_SUPPORTED |
|
2155 |
PNG_EXPORT(159, void, png_set_iCCP, (png_const_structrp png_ptr, |
|
2156 |
png_inforp info_ptr, png_const_charp name, int compression_type, |
|
2157 |
png_const_bytep profile, png_uint_32 proflen)); |
|
2 | 2158 |
#endif |
2159 |
||
10576 | 2160 |
#ifdef PNG_sPLT_SUPPORTED |
29913 | 2161 |
PNG_EXPORT(160, int, png_get_sPLT, (png_const_structrp png_ptr, |
2162 |
png_inforp info_ptr, png_sPLT_tpp entries)); |
|
2 | 2163 |
#endif |
2164 |
||
10576 | 2165 |
#ifdef PNG_sPLT_SUPPORTED |
29913 | 2166 |
PNG_EXPORT(161, void, png_set_sPLT, (png_const_structrp png_ptr, |
2167 |
png_inforp info_ptr, png_const_sPLT_tp entries, int nentries)); |
|
10576 | 2168 |
#endif |
2 | 2169 |
|
10576 | 2170 |
#ifdef PNG_TEXT_SUPPORTED |
2171 |
/* png_get_text also returns the number of text chunks in *num_text */ |
|
29913 | 2172 |
PNG_EXPORT(162, int, png_get_text, (png_const_structrp png_ptr, |
2173 |
png_inforp info_ptr, png_textp *text_ptr, int *num_text)); |
|
2 | 2174 |
#endif |
2175 |
||
10576 | 2176 |
/* Note while png_set_text() will accept a structure whose text, |
2177 |
* language, and translated keywords are NULL pointers, the structure |
|
2178 |
* returned by png_get_text will always contain regular |
|
2179 |
* zero-terminated C strings. They might be empty strings but |
|
2180 |
* they will never be NULL pointers. |
|
2181 |
*/ |
|
2 | 2182 |
|
10576 | 2183 |
#ifdef PNG_TEXT_SUPPORTED |
29913 | 2184 |
PNG_EXPORT(163, void, png_set_text, (png_const_structrp png_ptr, |
2185 |
png_inforp info_ptr, png_const_textp text_ptr, int num_text)); |
|
2 | 2186 |
#endif |
2187 |
||
10576 | 2188 |
#ifdef PNG_tIME_SUPPORTED |
29913 | 2189 |
PNG_EXPORT(164, png_uint_32, png_get_tIME, (png_const_structrp png_ptr, |
2190 |
png_inforp info_ptr, png_timep *mod_time)); |
|
2 | 2191 |
#endif |
2192 |
||
10576 | 2193 |
#ifdef PNG_tIME_SUPPORTED |
29913 | 2194 |
PNG_EXPORT(165, void, png_set_tIME, (png_const_structrp png_ptr, |
2195 |
png_inforp info_ptr, png_const_timep mod_time)); |
|
2 | 2196 |
#endif |
2197 |
||
10576 | 2198 |
#ifdef PNG_tRNS_SUPPORTED |
29913 | 2199 |
PNG_EXPORT(166, png_uint_32, png_get_tRNS, (png_const_structrp png_ptr, |
2200 |
png_inforp info_ptr, png_bytep *trans_alpha, int *num_trans, |
|
2201 |
png_color_16p *trans_color)); |
|
2 | 2202 |
#endif |
2203 |
||
10576 | 2204 |
#ifdef PNG_tRNS_SUPPORTED |
29913 | 2205 |
PNG_EXPORT(167, void, png_set_tRNS, (png_structrp png_ptr, |
2206 |
png_inforp info_ptr, png_const_bytep trans_alpha, int num_trans, |
|
10576 | 2207 |
png_const_color_16p trans_color)); |
2 | 2208 |
#endif |
10576 | 2209 |
|
2210 |
#ifdef PNG_sCAL_SUPPORTED |
|
29913 | 2211 |
PNG_FP_EXPORT(168, png_uint_32, png_get_sCAL, (png_const_structrp png_ptr, |
2212 |
png_const_inforp info_ptr, int *unit, double *width, double *height)) |
|
2213 |
#if defined(PNG_FLOATING_ARITHMETIC_SUPPORTED) || \ |
|
2214 |
defined(PNG_FLOATING_POINT_SUPPORTED) |
|
10576 | 2215 |
/* NOTE: this API is currently implemented using floating point arithmetic, |
2216 |
* consequently it can only be used on systems with floating point support. |
|
2217 |
* In any case the range of values supported by png_fixed_point is small and it |
|
2218 |
* is highly recommended that png_get_sCAL_s be used instead. |
|
2219 |
*/ |
|
2220 |
PNG_FIXED_EXPORT(214, png_uint_32, png_get_sCAL_fixed, |
|
29913 | 2221 |
(png_const_structrp png_ptr, png_const_inforp info_ptr, int *unit, |
2222 |
png_fixed_point *width, png_fixed_point *height)) |
|
2 | 2223 |
#endif |
10576 | 2224 |
PNG_EXPORT(169, png_uint_32, png_get_sCAL_s, |
29913 | 2225 |
(png_const_structrp png_ptr, png_const_inforp info_ptr, int *unit, |
2226 |
png_charpp swidth, png_charpp sheight)); |
|
2227 |
||
2228 |
PNG_FP_EXPORT(170, void, png_set_sCAL, (png_const_structrp png_ptr, |
|
2229 |
png_inforp info_ptr, int unit, double width, double height)) |
|
2230 |
PNG_FIXED_EXPORT(213, void, png_set_sCAL_fixed, (png_const_structrp png_ptr, |
|
2231 |
png_inforp info_ptr, int unit, png_fixed_point width, |
|
2232 |
png_fixed_point height)) |
|
2233 |
PNG_EXPORT(171, void, png_set_sCAL_s, (png_const_structrp png_ptr, |
|
2234 |
png_inforp info_ptr, int unit, |
|
2235 |
png_const_charp swidth, png_const_charp sheight)); |
|
2236 |
#endif /* sCAL */ |
|
2237 |
||
2238 |
#ifdef PNG_SET_UNKNOWN_CHUNKS_SUPPORTED |
|
2239 |
/* Provide the default handling for all unknown chunks or, optionally, for |
|
2240 |
* specific unknown chunks. |
|
2241 |
* |
|
2242 |
* NOTE: prior to 1.6.0 the handling specified for particular chunks on read was |
|
2243 |
* ignored and the default was used, the per-chunk setting only had an effect on |
|
2244 |
* write. If you wish to have chunk-specific handling on read in code that must |
|
2245 |
* work on earlier versions you must use a user chunk callback to specify the |
|
2246 |
* desired handling (keep or discard.) |
|
2247 |
* |
|
2248 |
* The 'keep' parameter is a PNG_HANDLE_CHUNK_ value as listed below. The |
|
2249 |
* parameter is interpreted as follows: |
|
2250 |
* |
|
2251 |
* READ: |
|
2252 |
* PNG_HANDLE_CHUNK_AS_DEFAULT: |
|
2253 |
* Known chunks: do normal libpng processing, do not keep the chunk (but |
|
2254 |
* see the comments below about PNG_HANDLE_AS_UNKNOWN_SUPPORTED) |
|
2255 |
* Unknown chunks: for a specific chunk use the global default, when used |
|
2256 |
* as the default discard the chunk data. |
|
2257 |
* PNG_HANDLE_CHUNK_NEVER: |
|
2258 |
* Discard the chunk data. |
|
2259 |
* PNG_HANDLE_CHUNK_IF_SAFE: |
|
2260 |
* Keep the chunk data if the chunk is not critical else raise a chunk |
|
2261 |
* error. |
|
2262 |
* PNG_HANDLE_CHUNK_ALWAYS: |
|
2263 |
* Keep the chunk data. |
|
2264 |
* |
|
2265 |
* If the chunk data is saved it can be retrieved using png_get_unknown_chunks, |
|
2266 |
* below. Notice that specifying "AS_DEFAULT" as a global default is equivalent |
|
2267 |
* to specifying "NEVER", however when "AS_DEFAULT" is used for specific chunks |
|
2268 |
* it simply resets the behavior to the libpng default. |
|
2269 |
* |
|
2270 |
* INTERACTION WTIH USER CHUNK CALLBACKS: |
|
2271 |
* The per-chunk handling is always used when there is a png_user_chunk_ptr |
|
2272 |
* callback and the callback returns 0; the chunk is then always stored *unless* |
|
2273 |
* it is critical and the per-chunk setting is other than ALWAYS. Notice that |
|
2274 |
* the global default is *not* used in this case. (In effect the per-chunk |
|
2275 |
* value is incremented to at least IF_SAFE.) |
|
2276 |
* |
|
2277 |
* IMPORTANT NOTE: this behavior will change in libpng 1.7 - the global and |
|
2278 |
* per-chunk defaults will be honored. If you want to preserve the current |
|
2279 |
* behavior when your callback returns 0 you must set PNG_HANDLE_CHUNK_IF_SAFE |
|
2280 |
* as the default - if you don't do this libpng 1.6 will issue a warning. |
|
2281 |
* |
|
2282 |
* If you want unhandled unknown chunks to be discarded in libpng 1.6 and |
|
2283 |
* earlier simply return '1' (handled). |
|
2284 |
* |
|
2285 |
* PNG_HANDLE_AS_UNKNOWN_SUPPORTED: |
|
2286 |
* If this is *not* set known chunks will always be handled by libpng and |
|
2287 |
* will never be stored in the unknown chunk list. Known chunks listed to |
|
2288 |
* png_set_keep_unknown_chunks will have no effect. If it is set then known |
|
2289 |
* chunks listed with a keep other than AS_DEFAULT will *never* be processed |
|
2290 |
* by libpng, in addition critical chunks must either be processed by the |
|
2291 |
* callback or saved. |
|
2292 |
* |
|
2293 |
* The IHDR and IEND chunks must not be listed. Because this turns off the |
|
2294 |
* default handling for chunks that would otherwise be recognized the |
|
2295 |
* behavior of libpng transformations may well become incorrect! |
|
2296 |
* |
|
2297 |
* WRITE: |
|
2298 |
* When writing chunks the options only apply to the chunks specified by |
|
2299 |
* png_set_unknown_chunks (below), libpng will *always* write known chunks |
|
2300 |
* required by png_set_ calls and will always write the core critical chunks |
|
2301 |
* (as required for PLTE). |
|
2302 |
* |
|
2303 |
* Each chunk in the png_set_unknown_chunks list is looked up in the |
|
2304 |
* png_set_keep_unknown_chunks list to find the keep setting, this is then |
|
2305 |
* interpreted as follows: |
|
2306 |
* |
|
2307 |
* PNG_HANDLE_CHUNK_AS_DEFAULT: |
|
2308 |
* Write safe-to-copy chunks and write other chunks if the global |
|
2309 |
* default is set to _ALWAYS, otherwise don't write this chunk. |
|
2310 |
* PNG_HANDLE_CHUNK_NEVER: |
|
2311 |
* Do not write the chunk. |
|
2312 |
* PNG_HANDLE_CHUNK_IF_SAFE: |
|
2313 |
* Write the chunk if it is safe-to-copy, otherwise do not write it. |
|
2314 |
* PNG_HANDLE_CHUNK_ALWAYS: |
|
2315 |
* Write the chunk. |
|
2316 |
* |
|
2317 |
* Note that the default behavior is effectively the opposite of the read case - |
|
2318 |
* in read unknown chunks are not stored by default, in write they are written |
|
2319 |
* by default. Also the behavior of PNG_HANDLE_CHUNK_IF_SAFE is very different |
|
2320 |
* - on write the safe-to-copy bit is checked, on read the critical bit is |
|
2321 |
* checked and on read if the chunk is critical an error will be raised. |
|
2322 |
* |
|
2323 |
* num_chunks: |
|
2324 |
* =========== |
|
2325 |
* If num_chunks is positive, then the "keep" parameter specifies the manner |
|
2326 |
* for handling only those chunks appearing in the chunk_list array, |
|
2327 |
* otherwise the chunk list array is ignored. |
|
2328 |
* |
|
2329 |
* If num_chunks is 0 the "keep" parameter specifies the default behavior for |
|
2330 |
* unknown chunks, as described above. |
|
2331 |
* |
|
2332 |
* If num_chunks is negative, then the "keep" parameter specifies the manner |
|
2333 |
* for handling all unknown chunks plus all chunks recognized by libpng |
|
2334 |
* except for the IHDR, PLTE, tRNS, IDAT, and IEND chunks (which continue to |
|
2335 |
* be processed by libpng. |
|
2336 |
*/ |
|
43321 | 2337 |
#ifdef PNG_HANDLE_AS_UNKNOWN_SUPPORTED |
29913 | 2338 |
PNG_EXPORT(172, void, png_set_keep_unknown_chunks, (png_structrp png_ptr, |
2339 |
int keep, png_const_bytep chunk_list, int num_chunks)); |
|
43321 | 2340 |
#endif /* HANDLE_AS_UNKNOWN */ |
29913 | 2341 |
|
2342 |
/* The "keep" PNG_HANDLE_CHUNK_ parameter for the specified chunk is returned; |
|
2343 |
* the result is therefore true (non-zero) if special handling is required, |
|
2344 |
* false for the default handling. |
|
2345 |
*/ |
|
2346 |
PNG_EXPORT(173, int, png_handle_as_unknown, (png_const_structrp png_ptr, |
|
10576 | 2347 |
png_const_bytep chunk_name)); |
43321 | 2348 |
#endif /* SET_UNKNOWN_CHUNKS */ |
29913 | 2349 |
|
2350 |
#ifdef PNG_STORE_UNKNOWN_CHUNKS_SUPPORTED |
|
2351 |
PNG_EXPORT(174, void, png_set_unknown_chunks, (png_const_structrp png_ptr, |
|
2352 |
png_inforp info_ptr, png_const_unknown_chunkp unknowns, |
|
10576 | 2353 |
int num_unknowns)); |
29913 | 2354 |
/* NOTE: prior to 1.6.0 this routine set the 'location' field of the added |
2355 |
* unknowns to the location currently stored in the png_struct. This is |
|
2356 |
* invariably the wrong value on write. To fix this call the following API |
|
2357 |
* for each chunk in the list with the correct location. If you know your |
|
2358 |
* code won't be compiled on earlier versions you can rely on |
|
2359 |
* png_set_unknown_chunks(write-ptr, png_get_unknown_chunks(read-ptr)) doing |
|
2360 |
* the correct thing. |
|
2361 |
*/ |
|
2362 |
||
10576 | 2363 |
PNG_EXPORT(175, void, png_set_unknown_chunk_location, |
29913 | 2364 |
(png_const_structrp png_ptr, png_inforp info_ptr, int chunk, int location)); |
2365 |
||
2366 |
PNG_EXPORT(176, int, png_get_unknown_chunks, (png_const_structrp png_ptr, |
|
2367 |
png_inforp info_ptr, png_unknown_chunkpp entries)); |
|
2 | 2368 |
#endif |
2369 |
||
2370 |
/* Png_free_data() will turn off the "valid" flag for anything it frees. |
|
10576 | 2371 |
* If you need to turn it off for a chunk that your application has freed, |
2372 |
* you can use png_set_invalid(png_ptr, info_ptr, PNG_INFO_CHNK); |
|
2373 |
*/ |
|
29913 | 2374 |
PNG_EXPORT(177, void, png_set_invalid, (png_const_structrp png_ptr, |
2375 |
png_inforp info_ptr, int mask)); |
|
2 | 2376 |
|
10576 | 2377 |
#ifdef PNG_INFO_IMAGE_SUPPORTED |
2 | 2378 |
/* The "params" pointer is currently not used and is for future expansion. */ |
29913 | 2379 |
#ifdef PNG_SEQUENTIAL_READ_SUPPORTED |
2380 |
PNG_EXPORT(178, void, png_read_png, (png_structrp png_ptr, png_inforp info_ptr, |
|
10576 | 2381 |
int transforms, png_voidp params)); |
29913 | 2382 |
#endif |
2383 |
#ifdef PNG_WRITE_SUPPORTED |
|
2384 |
PNG_EXPORT(179, void, png_write_png, (png_structrp png_ptr, png_inforp info_ptr, |
|
10576 | 2385 |
int transforms, png_voidp params)); |
2 | 2386 |
#endif |
29913 | 2387 |
#endif |
2 | 2388 |
|
10576 | 2389 |
PNG_EXPORT(180, png_const_charp, png_get_copyright, |
29913 | 2390 |
(png_const_structrp png_ptr)); |
10576 | 2391 |
PNG_EXPORT(181, png_const_charp, png_get_header_ver, |
29913 | 2392 |
(png_const_structrp png_ptr)); |
10576 | 2393 |
PNG_EXPORT(182, png_const_charp, png_get_header_version, |
29913 | 2394 |
(png_const_structrp png_ptr)); |
10576 | 2395 |
PNG_EXPORT(183, png_const_charp, png_get_libpng_ver, |
29913 | 2396 |
(png_const_structrp png_ptr)); |
2 | 2397 |
|
2398 |
#ifdef PNG_MNG_FEATURES_SUPPORTED |
|
29913 | 2399 |
PNG_EXPORT(184, png_uint_32, png_permit_mng_features, (png_structrp png_ptr, |
10576 | 2400 |
png_uint_32 mng_features_permitted)); |
2 | 2401 |
#endif |
2402 |
||
2403 |
/* For use in png_set_keep_unknown, added to version 1.2.6 */ |
|
2404 |
#define PNG_HANDLE_CHUNK_AS_DEFAULT 0 |
|
2405 |
#define PNG_HANDLE_CHUNK_NEVER 1 |
|
2406 |
#define PNG_HANDLE_CHUNK_IF_SAFE 2 |
|
2407 |
#define PNG_HANDLE_CHUNK_ALWAYS 3 |
|
29913 | 2408 |
#define PNG_HANDLE_CHUNK_LAST 4 |
2 | 2409 |
|
10576 | 2410 |
/* Strip the prepended error numbers ("#nnn ") from error and warning |
2411 |
* messages before passing them to the error or warning handler. |
|
2412 |
*/ |
|
2413 |
#ifdef PNG_ERROR_NUMBERS_SUPPORTED |
|
29913 | 2414 |
PNG_EXPORT(185, void, png_set_strip_error_numbers, (png_structrp png_ptr, |
10576 | 2415 |
png_uint_32 strip_mode)); |
2416 |
#endif |
|
2 | 2417 |
|
10576 | 2418 |
/* Added in libpng-1.2.6 */ |
2419 |
#ifdef PNG_SET_USER_LIMITS_SUPPORTED |
|
29913 | 2420 |
PNG_EXPORT(186, void, png_set_user_limits, (png_structrp png_ptr, |
10576 | 2421 |
png_uint_32 user_width_max, png_uint_32 user_height_max)); |
2422 |
PNG_EXPORT(187, png_uint_32, png_get_user_width_max, |
|
29913 | 2423 |
(png_const_structrp png_ptr)); |
10576 | 2424 |
PNG_EXPORT(188, png_uint_32, png_get_user_height_max, |
29913 | 2425 |
(png_const_structrp png_ptr)); |
10576 | 2426 |
/* Added in libpng-1.4.0 */ |
29913 | 2427 |
PNG_EXPORT(189, void, png_set_chunk_cache_max, (png_structrp png_ptr, |
10576 | 2428 |
png_uint_32 user_chunk_cache_max)); |
2429 |
PNG_EXPORT(190, png_uint_32, png_get_chunk_cache_max, |
|
29913 | 2430 |
(png_const_structrp png_ptr)); |
10576 | 2431 |
/* Added in libpng-1.4.1 */ |
29913 | 2432 |
PNG_EXPORT(191, void, png_set_chunk_malloc_max, (png_structrp png_ptr, |
10576 | 2433 |
png_alloc_size_t user_chunk_cache_max)); |
2434 |
PNG_EXPORT(192, png_alloc_size_t, png_get_chunk_malloc_max, |
|
29913 | 2435 |
(png_const_structrp png_ptr)); |
10576 | 2436 |
#endif |
2 | 2437 |
|
10576 | 2438 |
#if defined(PNG_INCH_CONVERSIONS_SUPPORTED) |
2439 |
PNG_EXPORT(193, png_uint_32, png_get_pixels_per_inch, |
|
29913 | 2440 |
(png_const_structrp png_ptr, png_const_inforp info_ptr)); |
2 | 2441 |
|
10576 | 2442 |
PNG_EXPORT(194, png_uint_32, png_get_x_pixels_per_inch, |
29913 | 2443 |
(png_const_structrp png_ptr, png_const_inforp info_ptr)); |
2 | 2444 |
|
10576 | 2445 |
PNG_EXPORT(195, png_uint_32, png_get_y_pixels_per_inch, |
29913 | 2446 |
(png_const_structrp png_ptr, png_const_inforp info_ptr)); |
2 | 2447 |
|
10576 | 2448 |
PNG_FP_EXPORT(196, float, png_get_x_offset_inches, |
29913 | 2449 |
(png_const_structrp png_ptr, png_const_inforp info_ptr)) |
10576 | 2450 |
#ifdef PNG_FIXED_POINT_SUPPORTED /* otherwise not implemented. */ |
2451 |
PNG_FIXED_EXPORT(211, png_fixed_point, png_get_x_offset_inches_fixed, |
|
29913 | 2452 |
(png_const_structrp png_ptr, png_const_inforp info_ptr)) |
10576 | 2453 |
#endif |
2 | 2454 |
|
29913 | 2455 |
PNG_FP_EXPORT(197, float, png_get_y_offset_inches, (png_const_structrp png_ptr, |
2456 |
png_const_inforp info_ptr)) |
|
10576 | 2457 |
#ifdef PNG_FIXED_POINT_SUPPORTED /* otherwise not implemented. */ |
2458 |
PNG_FIXED_EXPORT(212, png_fixed_point, png_get_y_offset_inches_fixed, |
|
29913 | 2459 |
(png_const_structrp png_ptr, png_const_inforp info_ptr)) |
2 | 2460 |
#endif |
2461 |
||
10576 | 2462 |
# ifdef PNG_pHYs_SUPPORTED |
29913 | 2463 |
PNG_EXPORT(198, png_uint_32, png_get_pHYs_dpi, (png_const_structrp png_ptr, |
2464 |
png_const_inforp info_ptr, png_uint_32 *res_x, png_uint_32 *res_y, |
|
10576 | 2465 |
int *unit_type)); |
29913 | 2466 |
# endif /* pHYs */ |
2467 |
#endif /* INCH_CONVERSIONS */ |
|
10576 | 2468 |
|
2469 |
/* Added in libpng-1.4.0 */ |
|
2470 |
#ifdef PNG_IO_STATE_SUPPORTED |
|
29913 | 2471 |
PNG_EXPORT(199, png_uint_32, png_get_io_state, (png_const_structrp png_ptr)); |
2472 |
||
2473 |
/* Removed from libpng 1.6; use png_get_io_chunk_type. */ |
|
2474 |
PNG_REMOVED(200, png_const_bytep, png_get_io_chunk_name, (png_structrp png_ptr), |
|
2475 |
PNG_DEPRECATED) |
|
2476 |
||
10576 | 2477 |
PNG_EXPORT(216, png_uint_32, png_get_io_chunk_type, |
29913 | 2478 |
(png_const_structrp png_ptr)); |
10576 | 2479 |
|
2480 |
/* The flags returned by png_get_io_state() are the following: */ |
|
2481 |
# define PNG_IO_NONE 0x0000 /* no I/O at this moment */ |
|
2482 |
# define PNG_IO_READING 0x0001 /* currently reading */ |
|
2483 |
# define PNG_IO_WRITING 0x0002 /* currently writing */ |
|
2484 |
# define PNG_IO_SIGNATURE 0x0010 /* currently at the file signature */ |
|
2485 |
# define PNG_IO_CHUNK_HDR 0x0020 /* currently at the chunk header */ |
|
2486 |
# define PNG_IO_CHUNK_DATA 0x0040 /* currently at the chunk data */ |
|
2487 |
# define PNG_IO_CHUNK_CRC 0x0080 /* currently at the chunk crc */ |
|
2488 |
# define PNG_IO_MASK_OP 0x000f /* current operation: reading/writing */ |
|
2489 |
# define PNG_IO_MASK_LOC 0x00f0 /* current location: sig/hdr/data/crc */ |
|
29913 | 2490 |
#endif /* IO_STATE */ |
10576 | 2491 |
|
2492 |
/* Interlace support. The following macros are always defined so that if |
|
2493 |
* libpng interlace handling is turned off the macros may be used to handle |
|
2494 |
* interlaced images within the application. |
|
2495 |
*/ |
|
2496 |
#define PNG_INTERLACE_ADAM7_PASSES 7 |
|
2497 |
||
2498 |
/* Two macros to return the first row and first column of the original, |
|
2499 |
* full, image which appears in a given pass. 'pass' is in the range 0 |
|
2500 |
* to 6 and the result is in the range 0 to 7. |
|
2501 |
*/ |
|
29913 | 2502 |
#define PNG_PASS_START_ROW(pass) (((1&~(pass))<<(3-((pass)>>1)))&7) |
2503 |
#define PNG_PASS_START_COL(pass) (((1& (pass))<<(3-(((pass)+1)>>1)))&7) |
|
2504 |
||
2505 |
/* A macro to return the offset between pixels in the output row for a pair of |
|
2506 |
* pixels in the input - effectively the inverse of the 'COL_SHIFT' macro that |
|
2507 |
* follows. Note that ROW_OFFSET is the offset from one row to the next whereas |
|
2508 |
* COL_OFFSET is from one column to the next, within a row. |
|
2509 |
*/ |
|
2510 |
#define PNG_PASS_ROW_OFFSET(pass) ((pass)>2?(8>>(((pass)-1)>>1)):8) |
|
2511 |
#define PNG_PASS_COL_OFFSET(pass) (1<<((7-(pass))>>1)) |
|
2 | 2512 |
|
10576 | 2513 |
/* Two macros to help evaluate the number of rows or columns in each |
2514 |
* pass. This is expressed as a shift - effectively log2 of the number or |
|
2515 |
* rows or columns in each 8x8 tile of the original image. |
|
2516 |
*/ |
|
2517 |
#define PNG_PASS_ROW_SHIFT(pass) ((pass)>2?(8-(pass))>>1:3) |
|
2518 |
#define PNG_PASS_COL_SHIFT(pass) ((pass)>1?(7-(pass))>>1:3) |
|
2519 |
||
2520 |
/* Hence two macros to determine the number of rows or columns in a given |
|
2521 |
* pass of an image given its height or width. In fact these macros may |
|
2522 |
* return non-zero even though the sub-image is empty, because the other |
|
2523 |
* dimension may be empty for a small image. |
|
2524 |
*/ |
|
2525 |
#define PNG_PASS_ROWS(height, pass) (((height)+(((1<<PNG_PASS_ROW_SHIFT(pass))\ |
|
2526 |
-1)-PNG_PASS_START_ROW(pass)))>>PNG_PASS_ROW_SHIFT(pass)) |
|
2527 |
#define PNG_PASS_COLS(width, pass) (((width)+(((1<<PNG_PASS_COL_SHIFT(pass))\ |
|
2528 |
-1)-PNG_PASS_START_COL(pass)))>>PNG_PASS_COL_SHIFT(pass)) |
|
2 | 2529 |
|
10576 | 2530 |
/* For the reader row callbacks (both progressive and sequential) it is |
2531 |
* necessary to find the row in the output image given a row in an interlaced |
|
2532 |
* image, so two more macros: |
|
2533 |
*/ |
|
29913 | 2534 |
#define PNG_ROW_FROM_PASS_ROW(y_in, pass) \ |
2535 |
(((y_in)<<PNG_PASS_ROW_SHIFT(pass))+PNG_PASS_START_ROW(pass)) |
|
2536 |
#define PNG_COL_FROM_PASS_COL(x_in, pass) \ |
|
2537 |
(((x_in)<<PNG_PASS_COL_SHIFT(pass))+PNG_PASS_START_COL(pass)) |
|
10576 | 2538 |
|
2539 |
/* Two macros which return a boolean (0 or 1) saying whether the given row |
|
2540 |
* or column is in a particular pass. These use a common utility macro that |
|
2541 |
* returns a mask for a given pass - the offset 'off' selects the row or |
|
2542 |
* column version. The mask has the appropriate bit set for each column in |
|
2543 |
* the tile. |
|
2544 |
*/ |
|
2545 |
#define PNG_PASS_MASK(pass,off) ( \ |
|
29913 | 2546 |
((0x110145AF>>(((7-(off))-(pass))<<2)) & 0xF) | \ |
2547 |
((0x01145AF0>>(((7-(off))-(pass))<<2)) & 0xF0)) |
|
10576 | 2548 |
|
2549 |
#define PNG_ROW_IN_INTERLACE_PASS(y, pass) \ |
|
2550 |
((PNG_PASS_MASK(pass,0) >> ((y)&7)) & 1) |
|
2551 |
#define PNG_COL_IN_INTERLACE_PASS(x, pass) \ |
|
2552 |
((PNG_PASS_MASK(pass,1) >> ((x)&7)) & 1) |
|
2 | 2553 |
|
2554 |
#ifdef PNG_READ_COMPOSITE_NODIV_SUPPORTED |
|
2555 |
/* With these routines we avoid an integer divide, which will be slower on |
|
2556 |
* most machines. However, it does take more operations than the corresponding |
|
2557 |
* divide method, so it may be slower on a few RISC systems. There are two |
|
2558 |
* shifts (by 8 or 16 bits) and an addition, versus a single integer divide. |
|
2559 |
* |
|
2560 |
* Note that the rounding factors are NOT supposed to be the same! 128 and |
|
2561 |
* 32768 are correct for the NODIV code; 127 and 32767 are correct for the |
|
2562 |
* standard method. |
|
2563 |
* |
|
2564 |
* [Optimized code by Greg Roelofs and Mark Adler...blame us for bugs. :-) ] |
|
2565 |
*/ |
|
2566 |
||
10576 | 2567 |
/* fg and bg should be in `gamma 1.0' space; alpha is the opacity */ |
2 | 2568 |
|
43321 | 2569 |
# define png_composite(composite, fg, alpha, bg) \ |
2570 |
{ \ |
|
2571 |
png_uint_16 temp = (png_uint_16)((png_uint_16)(fg) \ |
|
2572 |
* (png_uint_16)(alpha) \ |
|
2573 |
+ (png_uint_16)(bg)*(png_uint_16)(255 \ |
|
2574 |
- (png_uint_16)(alpha)) + 128); \ |
|
2575 |
(composite) = (png_byte)(((temp + (temp >> 8)) >> 8) & 0xff); \ |
|
2576 |
} |
|
2577 |
||
2578 |
# define png_composite_16(composite, fg, alpha, bg) \ |
|
2579 |
{ \ |
|
2580 |
png_uint_32 temp = (png_uint_32)((png_uint_32)(fg) \ |
|
2581 |
* (png_uint_32)(alpha) \ |
|
2582 |
+ (png_uint_32)(bg)*(65535 \ |
|
2583 |
- (png_uint_32)(alpha)) + 32768); \ |
|
2584 |
(composite) = (png_uint_16)(0xffff & ((temp + (temp >> 16)) >> 16)); \ |
|
2585 |
} |
|
2 | 2586 |
|
10576 | 2587 |
#else /* Standard method using integer division */ |
2 | 2588 |
|
43321 | 2589 |
# define png_composite(composite, fg, alpha, bg) \ |
2590 |
(composite) = \ |
|
2591 |
(png_byte)(0xff & (((png_uint_16)(fg) * (png_uint_16)(alpha) + \ |
|
2592 |
(png_uint_16)(bg) * (png_uint_16)(255 - (png_uint_16)(alpha)) + \ |
|
2593 |
127) / 255)) |
|
2594 |
||
2595 |
# define png_composite_16(composite, fg, alpha, bg) \ |
|
2596 |
(composite) = \ |
|
2597 |
(png_uint_16)(0xffff & (((png_uint_32)(fg) * (png_uint_32)(alpha) + \ |
|
2598 |
(png_uint_32)(bg)*(png_uint_32)(65535 - (png_uint_32)(alpha)) + \ |
|
2599 |
32767) / 65535)) |
|
29913 | 2600 |
#endif /* READ_COMPOSITE_NODIV */ |
2 | 2601 |
|
10576 | 2602 |
#ifdef PNG_READ_INT_FUNCTIONS_SUPPORTED |
2603 |
PNG_EXPORT(201, png_uint_32, png_get_uint_32, (png_const_bytep buf)); |
|
2604 |
PNG_EXPORT(202, png_uint_16, png_get_uint_16, (png_const_bytep buf)); |
|
2605 |
PNG_EXPORT(203, png_int_32, png_get_int_32, (png_const_bytep buf)); |
|
2606 |
#endif |
|
2607 |
||
29913 | 2608 |
PNG_EXPORT(204, png_uint_32, png_get_uint_31, (png_const_structrp png_ptr, |
10576 | 2609 |
png_const_bytep buf)); |
2 | 2610 |
/* No png_get_int_16 -- may be added if there's a real need for it. */ |
2611 |
||
10576 | 2612 |
/* Place a 32-bit number into a buffer in PNG byte order (big-endian). */ |
2613 |
#ifdef PNG_WRITE_INT_FUNCTIONS_SUPPORTED |
|
2614 |
PNG_EXPORT(205, void, png_save_uint_32, (png_bytep buf, png_uint_32 i)); |
|
2615 |
#endif |
|
2616 |
#ifdef PNG_SAVE_INT_32_SUPPORTED |
|
2617 |
PNG_EXPORT(206, void, png_save_int_32, (png_bytep buf, png_int_32 i)); |
|
2618 |
#endif |
|
2 | 2619 |
|
2620 |
/* Place a 16-bit number into a buffer in PNG byte order. |
|
2621 |
* The parameter is declared unsigned int, not png_uint_16, |
|
2622 |
* just to avoid potential problems on pre-ANSI C compilers. |
|
2623 |
*/ |
|
10576 | 2624 |
#ifdef PNG_WRITE_INT_FUNCTIONS_SUPPORTED |
2625 |
PNG_EXPORT(207, void, png_save_uint_16, (png_bytep buf, unsigned int i)); |
|
2 | 2626 |
/* No png_save_int_16 -- may be added if there's a real need for it. */ |
2627 |
#endif |
|
2628 |
||
10576 | 2629 |
#ifdef PNG_USE_READ_MACROS |
2630 |
/* Inline macros to do direct reads of bytes from the input buffer. |
|
2631 |
* The png_get_int_32() routine assumes we are using two's complement |
|
2632 |
* format for negative values, which is almost certainly true. |
|
2 | 2633 |
*/ |
29913 | 2634 |
# define PNG_get_uint_32(buf) \ |
43321 | 2635 |
(((png_uint_32)(*(buf)) << 24) + \ |
2636 |
((png_uint_32)(*((buf) + 1)) << 16) + \ |
|
2637 |
((png_uint_32)(*((buf) + 2)) << 8) + \ |
|
2638 |
((png_uint_32)(*((buf) + 3)))) |
|
2 | 2639 |
|
10576 | 2640 |
/* From libpng-1.4.0 until 1.4.4, the png_get_uint_16 macro (but not the |
2641 |
* function) incorrectly returned a value of type png_uint_32. |
|
2642 |
*/ |
|
29913 | 2643 |
# define PNG_get_uint_16(buf) \ |
43321 | 2644 |
((png_uint_16) \ |
2645 |
(((unsigned int)(*(buf)) << 8) + \ |
|
2646 |
((unsigned int)(*((buf) + 1))))) |
|
2 | 2647 |
|
29913 | 2648 |
# define PNG_get_int_32(buf) \ |
43321 | 2649 |
((png_int_32)((*(buf) & 0x80) \ |
2650 |
? -((png_int_32)(((png_get_uint_32(buf)^0xffffffffU)+1U)&0x7fffffffU)) \ |
|
2651 |
: (png_int_32)png_get_uint_32(buf))) |
|
2652 |
||
2653 |
/* If PNG_PREFIX is defined the same thing as below happens in pnglibconf.h, |
|
2654 |
* but defining a macro name prefixed with PNG_PREFIX. |
|
2655 |
*/ |
|
29913 | 2656 |
# ifndef PNG_PREFIX |
43321 | 2657 |
# define png_get_uint_32(buf) PNG_get_uint_32(buf) |
2658 |
# define png_get_uint_16(buf) PNG_get_uint_16(buf) |
|
2659 |
# define png_get_int_32(buf) PNG_get_int_32(buf) |
|
29913 | 2660 |
# endif |
2661 |
#else |
|
2662 |
# ifdef PNG_PREFIX |
|
43321 | 2663 |
/* No macros; revert to the (redefined) function */ |
2664 |
# define PNG_get_uint_32 (png_get_uint_32) |
|
2665 |
# define PNG_get_uint_16 (png_get_uint_16) |
|
2666 |
# define PNG_get_int_32 (png_get_int_32) |
|
29913 | 2667 |
# endif |
2 | 2668 |
#endif |
2669 |
||
35296 | 2670 |
#ifdef PNG_CHECK_FOR_INVALID_INDEX_SUPPORTED |
2671 |
PNG_EXPORT(242, void, png_set_check_for_invalid_index, |
|
2672 |
(png_structrp png_ptr, int allowed)); |
|
2673 |
# ifdef PNG_GET_PALETTE_MAX_SUPPORTED |
|
2674 |
PNG_EXPORT(243, int, png_get_palette_max, (png_const_structp png_ptr, |
|
2675 |
png_const_infop info_ptr)); |
|
2676 |
# endif |
|
2677 |
#endif /* CHECK_FOR_INVALID_INDEX */ |
|
2678 |
||
29913 | 2679 |
/******************************************************************************* |
35296 | 2680 |
* Section 5: SIMPLIFIED API |
29913 | 2681 |
******************************************************************************* |
2682 |
* |
|
2683 |
* Please read the documentation in libpng-manual.txt (TODO: write said |
|
2684 |
* documentation) if you don't understand what follows. |
|
2685 |
* |
|
2686 |
* The simplified API hides the details of both libpng and the PNG file format |
|
2687 |
* itself. It allows PNG files to be read into a very limited number of |
|
2688 |
* in-memory bitmap formats or to be written from the same formats. If these |
|
2689 |
* formats do not accomodate your needs then you can, and should, use the more |
|
2690 |
* sophisticated APIs above - these support a wide variety of in-memory formats |
|
2691 |
* and a wide variety of sophisticated transformations to those formats as well |
|
2692 |
* as a wide variety of APIs to manipulate ancillary information. |
|
2693 |
* |
|
2694 |
* To read a PNG file using the simplified API: |
|
2695 |
* |
|
35296 | 2696 |
* 1) Declare a 'png_image' structure (see below) on the stack, set the |
2697 |
* version field to PNG_IMAGE_VERSION and the 'opaque' pointer to NULL |
|
2698 |
* (this is REQUIRED, your program may crash if you don't do it.) |
|
29913 | 2699 |
* 2) Call the appropriate png_image_begin_read... function. |
2700 |
* 3) Set the png_image 'format' member to the required sample format. |
|
2701 |
* 4) Allocate a buffer for the image and, if required, the color-map. |
|
2702 |
* 5) Call png_image_finish_read to read the image and, if required, the |
|
2703 |
* color-map into your buffers. |
|
2704 |
* |
|
2705 |
* There are no restrictions on the format of the PNG input itself; all valid |
|
2706 |
* color types, bit depths, and interlace methods are acceptable, and the |
|
2707 |
* input image is transformed as necessary to the requested in-memory format |
|
2708 |
* during the png_image_finish_read() step. The only caveat is that if you |
|
2709 |
* request a color-mapped image from a PNG that is full-color or makes |
|
2710 |
* complex use of an alpha channel the transformation is extremely lossy and the |
|
2711 |
* result may look terrible. |
|
2712 |
* |
|
2713 |
* To write a PNG file using the simplified API: |
|
2714 |
* |
|
2715 |
* 1) Declare a 'png_image' structure on the stack and memset() it to all zero. |
|
2716 |
* 2) Initialize the members of the structure that describe the image, setting |
|
2717 |
* the 'format' member to the format of the image samples. |
|
2718 |
* 3) Call the appropriate png_image_write... function with a pointer to the |
|
2719 |
* image and, if necessary, the color-map to write the PNG data. |
|
2720 |
* |
|
2721 |
* png_image is a structure that describes the in-memory format of an image |
|
2722 |
* when it is being read or defines the in-memory format of an image that you |
|
2723 |
* need to write: |
|
2724 |
*/ |
|
35296 | 2725 |
#if defined(PNG_SIMPLIFIED_READ_SUPPORTED) || \ |
2726 |
defined(PNG_SIMPLIFIED_WRITE_SUPPORTED) |
|
2727 |
||
29913 | 2728 |
#define PNG_IMAGE_VERSION 1 |
2729 |
||
2730 |
typedef struct png_control *png_controlp; |
|
2731 |
typedef struct |
|
2732 |
{ |
|
2733 |
png_controlp opaque; /* Initialize to NULL, free with png_image_free */ |
|
2734 |
png_uint_32 version; /* Set to PNG_IMAGE_VERSION */ |
|
2735 |
png_uint_32 width; /* Image width in pixels (columns) */ |
|
2736 |
png_uint_32 height; /* Image height in pixels (rows) */ |
|
2737 |
png_uint_32 format; /* Image format as defined below */ |
|
2738 |
png_uint_32 flags; /* A bit mask containing informational flags */ |
|
2739 |
png_uint_32 colormap_entries; |
|
2740 |
/* Number of entries in the color-map */ |
|
2741 |
||
2742 |
/* In the event of an error or warning the following field will be set to a |
|
2743 |
* non-zero value and the 'message' field will contain a '\0' terminated |
|
2744 |
* string with the libpng error or warning message. If both warnings and |
|
2745 |
* an error were encountered, only the error is recorded. If there |
|
2746 |
* are multiple warnings, only the first one is recorded. |
|
2747 |
* |
|
2748 |
* The upper 30 bits of this value are reserved, the low two bits contain |
|
2749 |
* a value as follows: |
|
2750 |
*/ |
|
2751 |
# define PNG_IMAGE_WARNING 1 |
|
2752 |
# define PNG_IMAGE_ERROR 2 |
|
2753 |
/* |
|
2754 |
* The result is a two-bit code such that a value more than 1 indicates |
|
2755 |
* a failure in the API just called: |
|
2756 |
* |
|
2757 |
* 0 - no warning or error |
|
2758 |
* 1 - warning |
|
2759 |
* 2 - error |
|
2760 |
* 3 - error preceded by warning |
|
2761 |
*/ |
|
2762 |
# define PNG_IMAGE_FAILED(png_cntrl) ((((png_cntrl).warning_or_error)&0x03)>1) |
|
2763 |
||
2764 |
png_uint_32 warning_or_error; |
|
2765 |
||
2766 |
char message[64]; |
|
2767 |
} png_image, *png_imagep; |
|
2768 |
||
2769 |
/* The samples of the image have one to four channels whose components have |
|
2770 |
* original values in the range 0 to 1.0: |
|
2771 |
* |
|
2772 |
* 1: A single gray or luminance channel (G). |
|
2773 |
* 2: A gray/luminance channel and an alpha channel (GA). |
|
2774 |
* 3: Three red, green, blue color channels (RGB). |
|
2775 |
* 4: Three color channels and an alpha channel (RGBA). |
|
2776 |
* |
|
2777 |
* The components are encoded in one of two ways: |
|
2778 |
* |
|
2779 |
* a) As a small integer, value 0..255, contained in a single byte. For the |
|
2780 |
* alpha channel the original value is simply value/255. For the color or |
|
2781 |
* luminance channels the value is encoded according to the sRGB specification |
|
2782 |
* and matches the 8-bit format expected by typical display devices. |
|
2783 |
* |
|
2784 |
* The color/gray channels are not scaled (pre-multiplied) by the alpha |
|
2785 |
* channel and are suitable for passing to color management software. |
|
2786 |
* |
|
2787 |
* b) As a value in the range 0..65535, contained in a 2-byte integer. All |
|
2788 |
* channels can be converted to the original value by dividing by 65535; all |
|
2789 |
* channels are linear. Color channels use the RGB encoding (RGB end-points) of |
|
2790 |
* the sRGB specification. This encoding is identified by the |
|
2791 |
* PNG_FORMAT_FLAG_LINEAR flag below. |
|
2792 |
* |
|
2793 |
* When the simplified API needs to convert between sRGB and linear colorspaces, |
|
2794 |
* the actual sRGB transfer curve defined in the sRGB specification (see the |
|
48280 | 2795 |
* article at https://en.wikipedia.org/wiki/SRGB) is used, not the gamma=1/2.2 |
29913 | 2796 |
* approximation used elsewhere in libpng. |
2797 |
* |
|
2798 |
* When an alpha channel is present it is expected to denote pixel coverage |
|
2799 |
* of the color or luminance channels and is returned as an associated alpha |
|
2800 |
* channel: the color/gray channels are scaled (pre-multiplied) by the alpha |
|
2801 |
* value. |
|
2802 |
* |
|
2803 |
* The samples are either contained directly in the image data, between 1 and 8 |
|
2804 |
* bytes per pixel according to the encoding, or are held in a color-map indexed |
|
2805 |
* by bytes in the image data. In the case of a color-map the color-map entries |
|
2806 |
* are individual samples, encoded as above, and the image data has one byte per |
|
2807 |
* pixel to select the relevant sample from the color-map. |
|
2808 |
*/ |
|
2809 |
||
2810 |
/* PNG_FORMAT_* |
|
2811 |
* |
|
2812 |
* #defines to be used in png_image::format. Each #define identifies a |
|
2813 |
* particular layout of sample data and, if present, alpha values. There are |
|
2814 |
* separate defines for each of the two component encodings. |
|
2815 |
* |
|
2816 |
* A format is built up using single bit flag values. All combinations are |
|
2817 |
* valid. Formats can be built up from the flag values or you can use one of |
|
2818 |
* the predefined values below. When testing formats always use the FORMAT_FLAG |
|
2819 |
* macros to test for individual features - future versions of the library may |
|
2820 |
* add new flags. |
|
2821 |
* |
|
2822 |
* When reading or writing color-mapped images the format should be set to the |
|
2823 |
* format of the entries in the color-map then png_image_{read,write}_colormap |
|
2824 |
* called to read or write the color-map and set the format correctly for the |
|
2825 |
* image data. Do not set the PNG_FORMAT_FLAG_COLORMAP bit directly! |
|
2826 |
* |
|
35296 | 2827 |
* NOTE: libpng can be built with particular features disabled. If you see |
29913 | 2828 |
* compiler errors because the definition of one of the following flags has been |
2829 |
* compiled out it is because libpng does not have the required support. It is |
|
2830 |
* possible, however, for the libpng configuration to enable the format on just |
|
2831 |
* read or just write; in that case you may see an error at run time. You can |
|
2832 |
* guard against this by checking for the definition of the appropriate |
|
2833 |
* "_SUPPORTED" macro, one of: |
|
2834 |
* |
|
2835 |
* PNG_SIMPLIFIED_{READ,WRITE}_{BGR,AFIRST}_SUPPORTED |
|
2836 |
*/ |
|
2837 |
#define PNG_FORMAT_FLAG_ALPHA 0x01U /* format with an alpha channel */ |
|
2838 |
#define PNG_FORMAT_FLAG_COLOR 0x02U /* color format: otherwise grayscale */ |
|
35296 | 2839 |
#define PNG_FORMAT_FLAG_LINEAR 0x04U /* 2-byte channels else 1-byte */ |
29913 | 2840 |
#define PNG_FORMAT_FLAG_COLORMAP 0x08U /* image data is color-mapped */ |
2841 |
||
2842 |
#ifdef PNG_FORMAT_BGR_SUPPORTED |
|
2843 |
# define PNG_FORMAT_FLAG_BGR 0x10U /* BGR colors, else order is RGB */ |
|
2844 |
#endif |
|
2845 |
||
2846 |
#ifdef PNG_FORMAT_AFIRST_SUPPORTED |
|
2847 |
# define PNG_FORMAT_FLAG_AFIRST 0x20U /* alpha channel comes first */ |
|
2848 |
#endif |
|
2849 |
||
48280 | 2850 |
#define PNG_FORMAT_FLAG_ASSOCIATED_ALPHA 0x40U /* alpha channel is associated */ |
2851 |
||
29913 | 2852 |
/* Commonly used formats have predefined macros. |
2853 |
* |
|
2854 |
* First the single byte (sRGB) formats: |
|
2855 |
*/ |
|
2856 |
#define PNG_FORMAT_GRAY 0 |
|
2857 |
#define PNG_FORMAT_GA PNG_FORMAT_FLAG_ALPHA |
|
2858 |
#define PNG_FORMAT_AG (PNG_FORMAT_GA|PNG_FORMAT_FLAG_AFIRST) |
|
2859 |
#define PNG_FORMAT_RGB PNG_FORMAT_FLAG_COLOR |
|
2860 |
#define PNG_FORMAT_BGR (PNG_FORMAT_FLAG_COLOR|PNG_FORMAT_FLAG_BGR) |
|
2861 |
#define PNG_FORMAT_RGBA (PNG_FORMAT_RGB|PNG_FORMAT_FLAG_ALPHA) |
|
2862 |
#define PNG_FORMAT_ARGB (PNG_FORMAT_RGBA|PNG_FORMAT_FLAG_AFIRST) |
|
2863 |
#define PNG_FORMAT_BGRA (PNG_FORMAT_BGR|PNG_FORMAT_FLAG_ALPHA) |
|
2864 |
#define PNG_FORMAT_ABGR (PNG_FORMAT_BGRA|PNG_FORMAT_FLAG_AFIRST) |
|
2865 |
||
2866 |
/* Then the linear 2-byte formats. When naming these "Y" is used to |
|
2867 |
* indicate a luminance (gray) channel. |
|
2868 |
*/ |
|
2869 |
#define PNG_FORMAT_LINEAR_Y PNG_FORMAT_FLAG_LINEAR |
|
2870 |
#define PNG_FORMAT_LINEAR_Y_ALPHA (PNG_FORMAT_FLAG_LINEAR|PNG_FORMAT_FLAG_ALPHA) |
|
2871 |
#define PNG_FORMAT_LINEAR_RGB (PNG_FORMAT_FLAG_LINEAR|PNG_FORMAT_FLAG_COLOR) |
|
2872 |
#define PNG_FORMAT_LINEAR_RGB_ALPHA \ |
|
2873 |
(PNG_FORMAT_FLAG_LINEAR|PNG_FORMAT_FLAG_COLOR|PNG_FORMAT_FLAG_ALPHA) |
|
2874 |
||
2875 |
/* With color-mapped formats the image data is one byte for each pixel, the byte |
|
2876 |
* is an index into the color-map which is formatted as above. To obtain a |
|
2877 |
* color-mapped format it is sufficient just to add the PNG_FOMAT_FLAG_COLORMAP |
|
2878 |
* to one of the above definitions, or you can use one of the definitions below. |
|
2879 |
*/ |
|
2880 |
#define PNG_FORMAT_RGB_COLORMAP (PNG_FORMAT_RGB|PNG_FORMAT_FLAG_COLORMAP) |
|
2881 |
#define PNG_FORMAT_BGR_COLORMAP (PNG_FORMAT_BGR|PNG_FORMAT_FLAG_COLORMAP) |
|
2882 |
#define PNG_FORMAT_RGBA_COLORMAP (PNG_FORMAT_RGBA|PNG_FORMAT_FLAG_COLORMAP) |
|
2883 |
#define PNG_FORMAT_ARGB_COLORMAP (PNG_FORMAT_ARGB|PNG_FORMAT_FLAG_COLORMAP) |
|
2884 |
#define PNG_FORMAT_BGRA_COLORMAP (PNG_FORMAT_BGRA|PNG_FORMAT_FLAG_COLORMAP) |
|
2885 |
#define PNG_FORMAT_ABGR_COLORMAP (PNG_FORMAT_ABGR|PNG_FORMAT_FLAG_COLORMAP) |
|
2886 |
||
2887 |
/* PNG_IMAGE macros |
|
2888 |
* |
|
2889 |
* These are convenience macros to derive information from a png_image |
|
2890 |
* structure. The PNG_IMAGE_SAMPLE_ macros return values appropriate to the |
|
2891 |
* actual image sample values - either the entries in the color-map or the |
|
2892 |
* pixels in the image. The PNG_IMAGE_PIXEL_ macros return corresponding values |
|
2893 |
* for the pixels and will always return 1 for color-mapped formats. The |
|
2894 |
* remaining macros return information about the rows in the image and the |
|
2895 |
* complete image. |
|
2896 |
* |
|
2897 |
* NOTE: All the macros that take a png_image::format parameter are compile time |
|
2898 |
* constants if the format parameter is, itself, a constant. Therefore these |
|
2899 |
* macros can be used in array declarations and case labels where required. |
|
2900 |
* Similarly the macros are also pre-processor constants (sizeof is not used) so |
|
2901 |
* they can be used in #if tests. |
|
2902 |
* |
|
2903 |
* First the information about the samples. |
|
2904 |
*/ |
|
2905 |
#define PNG_IMAGE_SAMPLE_CHANNELS(fmt)\ |
|
2906 |
(((fmt)&(PNG_FORMAT_FLAG_COLOR|PNG_FORMAT_FLAG_ALPHA))+1) |
|
2907 |
/* Return the total number of channels in a given format: 1..4 */ |
|
2908 |
||
2909 |
#define PNG_IMAGE_SAMPLE_COMPONENT_SIZE(fmt)\ |
|
2910 |
((((fmt) & PNG_FORMAT_FLAG_LINEAR) >> 2)+1) |
|
2911 |
/* Return the size in bytes of a single component of a pixel or color-map |
|
2912 |
* entry (as appropriate) in the image: 1 or 2. |
|
2913 |
*/ |
|
2914 |
||
2915 |
#define PNG_IMAGE_SAMPLE_SIZE(fmt)\ |
|
2916 |
(PNG_IMAGE_SAMPLE_CHANNELS(fmt) * PNG_IMAGE_SAMPLE_COMPONENT_SIZE(fmt)) |
|
2917 |
/* This is the size of the sample data for one sample. If the image is |
|
2918 |
* color-mapped it is the size of one color-map entry (and image pixels are |
|
2919 |
* one byte in size), otherwise it is the size of one image pixel. |
|
2920 |
*/ |
|
2921 |
||
2922 |
#define PNG_IMAGE_MAXIMUM_COLORMAP_COMPONENTS(fmt)\ |
|
2923 |
(PNG_IMAGE_SAMPLE_CHANNELS(fmt) * 256) |
|
2924 |
/* The maximum size of the color-map required by the format expressed in a |
|
2925 |
* count of components. This can be used to compile-time allocate a |
|
2926 |
* color-map: |
|
2927 |
* |
|
2928 |
* png_uint_16 colormap[PNG_IMAGE_MAXIMUM_COLORMAP_COMPONENTS(linear_fmt)]; |
|
2929 |
* |
|
2930 |
* png_byte colormap[PNG_IMAGE_MAXIMUM_COLORMAP_COMPONENTS(sRGB_fmt)]; |
|
2931 |
* |
|
2932 |
* Alternatively use the PNG_IMAGE_COLORMAP_SIZE macro below to use the |
|
2933 |
* information from one of the png_image_begin_read_ APIs and dynamically |
|
2934 |
* allocate the required memory. |
|
2935 |
*/ |
|
2936 |
||
2937 |
/* Corresponding information about the pixels */ |
|
2938 |
#define PNG_IMAGE_PIXEL_(test,fmt)\ |
|
2939 |
(((fmt)&PNG_FORMAT_FLAG_COLORMAP)?1:test(fmt)) |
|
2940 |
||
2941 |
#define PNG_IMAGE_PIXEL_CHANNELS(fmt)\ |
|
2942 |
PNG_IMAGE_PIXEL_(PNG_IMAGE_SAMPLE_CHANNELS,fmt) |
|
2943 |
/* The number of separate channels (components) in a pixel; 1 for a |
|
2944 |
* color-mapped image. |
|
2945 |
*/ |
|
2946 |
||
2947 |
#define PNG_IMAGE_PIXEL_COMPONENT_SIZE(fmt)\ |
|
2948 |
PNG_IMAGE_PIXEL_(PNG_IMAGE_SAMPLE_COMPONENT_SIZE,fmt) |
|
2949 |
/* The size, in bytes, of each component in a pixel; 1 for a color-mapped |
|
2950 |
* image. |
|
2951 |
*/ |
|
2952 |
||
2953 |
#define PNG_IMAGE_PIXEL_SIZE(fmt) PNG_IMAGE_PIXEL_(PNG_IMAGE_SAMPLE_SIZE,fmt) |
|
2954 |
/* The size, in bytes, of a complete pixel; 1 for a color-mapped image. */ |
|
2955 |
||
2956 |
/* Information about the whole row, or whole image */ |
|
2957 |
#define PNG_IMAGE_ROW_STRIDE(image)\ |
|
2958 |
(PNG_IMAGE_PIXEL_CHANNELS((image).format) * (image).width) |
|
2959 |
/* Return the total number of components in a single row of the image; this |
|
2960 |
* is the minimum 'row stride', the minimum count of components between each |
|
2961 |
* row. For a color-mapped image this is the minimum number of bytes in a |
|
2962 |
* row. |
|
40436
94ae0ede53a5
8155690: Update libPNG library to the latest up-to-date
azvegint
parents:
35296
diff
changeset
|
2963 |
* |
94ae0ede53a5
8155690: Update libPNG library to the latest up-to-date
azvegint
parents:
35296
diff
changeset
|
2964 |
* WARNING: this macro overflows for some images with more than one component |
94ae0ede53a5
8155690: Update libPNG library to the latest up-to-date
azvegint
parents:
35296
diff
changeset
|
2965 |
* and very large image widths. libpng will refuse to process an image where |
94ae0ede53a5
8155690: Update libPNG library to the latest up-to-date
azvegint
parents:
35296
diff
changeset
|
2966 |
* this macro would overflow. |
29913 | 2967 |
*/ |
2968 |
||
2969 |
#define PNG_IMAGE_BUFFER_SIZE(image, row_stride)\ |
|
2970 |
(PNG_IMAGE_PIXEL_COMPONENT_SIZE((image).format)*(image).height*(row_stride)) |
|
2971 |
/* Return the size, in bytes, of an image buffer given a png_image and a row |
|
2972 |
* stride - the number of components to leave space for in each row. |
|
40436
94ae0ede53a5
8155690: Update libPNG library to the latest up-to-date
azvegint
parents:
35296
diff
changeset
|
2973 |
* |
94ae0ede53a5
8155690: Update libPNG library to the latest up-to-date
azvegint
parents:
35296
diff
changeset
|
2974 |
* WARNING: this macro overflows a 32-bit integer for some large PNG images, |
94ae0ede53a5
8155690: Update libPNG library to the latest up-to-date
azvegint
parents:
35296
diff
changeset
|
2975 |
* libpng will refuse to process an image where such an overflow would occur. |
29913 | 2976 |
*/ |
2977 |
||
2978 |
#define PNG_IMAGE_SIZE(image)\ |
|
2979 |
PNG_IMAGE_BUFFER_SIZE(image, PNG_IMAGE_ROW_STRIDE(image)) |
|
2980 |
/* Return the size, in bytes, of the image in memory given just a png_image; |
|
2981 |
* the row stride is the minimum stride required for the image. |
|
2982 |
*/ |
|
2983 |
||
2984 |
#define PNG_IMAGE_COLORMAP_SIZE(image)\ |
|
2985 |
(PNG_IMAGE_SAMPLE_SIZE((image).format) * (image).colormap_entries) |
|
2986 |
/* Return the size, in bytes, of the color-map of this image. If the image |
|
2987 |
* format is not a color-map format this will return a size sufficient for |
|
2988 |
* 256 entries in the given format; check PNG_FORMAT_FLAG_COLORMAP if |
|
2989 |
* you don't want to allocate a color-map in this case. |
|
2990 |
*/ |
|
2991 |
||
2992 |
/* PNG_IMAGE_FLAG_* |
|
2993 |
* |
|
2994 |
* Flags containing additional information about the image are held in the |
|
2995 |
* 'flags' field of png_image. |
|
2996 |
*/ |
|
2997 |
#define PNG_IMAGE_FLAG_COLORSPACE_NOT_sRGB 0x01 |
|
2998 |
/* This indicates the the RGB values of the in-memory bitmap do not |
|
2999 |
* correspond to the red, green and blue end-points defined by sRGB. |
|
3000 |
*/ |
|
3001 |
||
3002 |
#define PNG_IMAGE_FLAG_FAST 0x02 |
|
3003 |
/* On write emphasise speed over compression; the resultant PNG file will be |
|
3004 |
* larger but will be produced significantly faster, particular for large |
|
3005 |
* images. Do not use this option for images which will be distributed, only |
|
3006 |
* used it when producing intermediate files that will be read back in |
|
3007 |
* repeatedly. For a typical 24-bit image the option will double the read |
|
3008 |
* speed at the cost of increasing the image size by 25%, however for many |
|
3009 |
* more compressible images the PNG file can be 10 times larger with only a |
|
3010 |
* slight speed gain. |
|
3011 |
*/ |
|
3012 |
||
3013 |
#define PNG_IMAGE_FLAG_16BIT_sRGB 0x04 |
|
3014 |
/* On read if the image is a 16-bit per component image and there is no gAMA |
|
3015 |
* or sRGB chunk assume that the components are sRGB encoded. Notice that |
|
3016 |
* images output by the simplified API always have gamma information; setting |
|
3017 |
* this flag only affects the interpretation of 16-bit images from an |
|
3018 |
* external source. It is recommended that the application expose this flag |
|
3019 |
* to the user; the user can normally easily recognize the difference between |
|
3020 |
* linear and sRGB encoding. This flag has no effect on write - the data |
|
3021 |
* passed to the write APIs must have the correct encoding (as defined |
|
3022 |
* above.) |
|
3023 |
* |
|
3024 |
* If the flag is not set (the default) input 16-bit per component data is |
|
3025 |
* assumed to be linear. |
|
3026 |
* |
|
3027 |
* NOTE: the flag can only be set after the png_image_begin_read_ call, |
|
3028 |
* because that call initializes the 'flags' field. |
|
3029 |
*/ |
|
3030 |
||
3031 |
#ifdef PNG_SIMPLIFIED_READ_SUPPORTED |
|
3032 |
/* READ APIs |
|
3033 |
* --------- |
|
3034 |
* |
|
3035 |
* The png_image passed to the read APIs must have been initialized by setting |
|
3036 |
* the png_controlp field 'opaque' to NULL (or, safer, memset the whole thing.) |
|
3037 |
*/ |
|
3038 |
#ifdef PNG_STDIO_SUPPORTED |
|
3039 |
PNG_EXPORT(234, int, png_image_begin_read_from_file, (png_imagep image, |
|
3040 |
const char *file_name)); |
|
3041 |
/* The named file is opened for read and the image header is filled in |
|
3042 |
* from the PNG header in the file. |
|
3043 |
*/ |
|
3044 |
||
3045 |
PNG_EXPORT(235, int, png_image_begin_read_from_stdio, (png_imagep image, |
|
3046 |
FILE* file)); |
|
3047 |
/* The PNG header is read from the stdio FILE object. */ |
|
3048 |
#endif /* STDIO */ |
|
3049 |
||
3050 |
PNG_EXPORT(236, int, png_image_begin_read_from_memory, (png_imagep image, |
|
3051 |
png_const_voidp memory, png_size_t size)); |
|
3052 |
/* The PNG header is read from the given memory buffer. */ |
|
3053 |
||
3054 |
PNG_EXPORT(237, int, png_image_finish_read, (png_imagep image, |
|
3055 |
png_const_colorp background, void *buffer, png_int_32 row_stride, |
|
3056 |
void *colormap)); |
|
3057 |
/* Finish reading the image into the supplied buffer and clean up the |
|
3058 |
* png_image structure. |
|
3059 |
* |
|
3060 |
* row_stride is the step, in byte or 2-byte units as appropriate, |
|
3061 |
* between adjacent rows. A positive stride indicates that the top-most row |
|
3062 |
* is first in the buffer - the normal top-down arrangement. A negative |
|
3063 |
* stride indicates that the bottom-most row is first in the buffer. |
|
3064 |
* |
|
3065 |
* background need only be supplied if an alpha channel must be removed from |
|
3066 |
* a png_byte format and the removal is to be done by compositing on a solid |
|
3067 |
* color; otherwise it may be NULL and any composition will be done directly |
|
3068 |
* onto the buffer. The value is an sRGB color to use for the background, |
|
3069 |
* for grayscale output the green channel is used. |
|
3070 |
* |
|
3071 |
* background must be supplied when an alpha channel must be removed from a |
|
3072 |
* single byte color-mapped output format, in other words if: |
|
3073 |
* |
|
3074 |
* 1) The original format from png_image_begin_read_from_* had |
|
3075 |
* PNG_FORMAT_FLAG_ALPHA set. |
|
3076 |
* 2) The format set by the application does not. |
|
3077 |
* 3) The format set by the application has PNG_FORMAT_FLAG_COLORMAP set and |
|
3078 |
* PNG_FORMAT_FLAG_LINEAR *not* set. |
|
3079 |
* |
|
3080 |
* For linear output removing the alpha channel is always done by compositing |
|
3081 |
* on black and background is ignored. |
|
3082 |
* |
|
3083 |
* colormap must be supplied when PNG_FORMAT_FLAG_COLORMAP is set. It must |
|
3084 |
* be at least the size (in bytes) returned by PNG_IMAGE_COLORMAP_SIZE. |
|
3085 |
* image->colormap_entries will be updated to the actual number of entries |
|
3086 |
* written to the colormap; this may be less than the original value. |
|
3087 |
*/ |
|
3088 |
||
3089 |
PNG_EXPORT(238, void, png_image_free, (png_imagep image)); |
|
3090 |
/* Free any data allocated by libpng in image->opaque, setting the pointer to |
|
3091 |
* NULL. May be called at any time after the structure is initialized. |
|
3092 |
*/ |
|
3093 |
#endif /* SIMPLIFIED_READ */ |
|
3094 |
||
3095 |
#ifdef PNG_SIMPLIFIED_WRITE_SUPPORTED |
|
3096 |
/* WRITE APIS |
|
3097 |
* ---------- |
|
3098 |
* For write you must initialize a png_image structure to describe the image to |
|
3099 |
* be written. To do this use memset to set the whole structure to 0 then |
|
3100 |
* initialize fields describing your image. |
|
3101 |
* |
|
3102 |
* version: must be set to PNG_IMAGE_VERSION |
|
3103 |
* opaque: must be initialized to NULL |
|
3104 |
* width: image width in pixels |
|
3105 |
* height: image height in rows |
|
3106 |
* format: the format of the data (image and color-map) you wish to write |
|
3107 |
* flags: set to 0 unless one of the defined flags applies; set |
|
3108 |
* PNG_IMAGE_FLAG_COLORSPACE_NOT_sRGB for color format images where the RGB |
|
3109 |
* values do not correspond to the colors in sRGB. |
|
3110 |
* colormap_entries: set to the number of entries in the color-map (0 to 256) |
|
3111 |
*/ |
|
40436
94ae0ede53a5
8155690: Update libPNG library to the latest up-to-date
azvegint
parents:
35296
diff
changeset
|
3112 |
#ifdef PNG_SIMPLIFIED_WRITE_STDIO_SUPPORTED |
29913 | 3113 |
PNG_EXPORT(239, int, png_image_write_to_file, (png_imagep image, |
3114 |
const char *file, int convert_to_8bit, const void *buffer, |
|
3115 |
png_int_32 row_stride, const void *colormap)); |
|
3116 |
/* Write the image to the named file. */ |
|
3117 |
||
3118 |
PNG_EXPORT(240, int, png_image_write_to_stdio, (png_imagep image, FILE *file, |
|
3119 |
int convert_to_8_bit, const void *buffer, png_int_32 row_stride, |
|
3120 |
const void *colormap)); |
|
3121 |
/* Write the image to the given (FILE*). */ |
|
40436
94ae0ede53a5
8155690: Update libPNG library to the latest up-to-date
azvegint
parents:
35296
diff
changeset
|
3122 |
#endif /* SIMPLIFIED_WRITE_STDIO */ |
94ae0ede53a5
8155690: Update libPNG library to the latest up-to-date
azvegint
parents:
35296
diff
changeset
|
3123 |
|
94ae0ede53a5
8155690: Update libPNG library to the latest up-to-date
azvegint
parents:
35296
diff
changeset
|
3124 |
/* With all write APIs if image is in one of the linear formats with 16-bit |
29913 | 3125 |
* data then setting convert_to_8_bit will cause the output to be an 8-bit PNG |
3126 |
* gamma encoded according to the sRGB specification, otherwise a 16-bit linear |
|
3127 |
* encoded PNG file is written. |
|
3128 |
* |
|
3129 |
* With color-mapped data formats the colormap parameter point to a color-map |
|
3130 |
* with at least image->colormap_entries encoded in the specified format. If |
|
3131 |
* the format is linear the written PNG color-map will be converted to sRGB |
|
3132 |
* regardless of the convert_to_8_bit flag. |
|
3133 |
* |
|
3134 |
* With all APIs row_stride is handled as in the read APIs - it is the spacing |
|
3135 |
* from one row to the next in component sized units (1 or 2 bytes) and if |
|
40436
94ae0ede53a5
8155690: Update libPNG library to the latest up-to-date
azvegint
parents:
35296
diff
changeset
|
3136 |
* negative indicates a bottom-up row layout in the buffer. If row_stride is |
94ae0ede53a5
8155690: Update libPNG library to the latest up-to-date
azvegint
parents:
35296
diff
changeset
|
3137 |
* zero, libpng will calculate it for you from the image width and number of |
94ae0ede53a5
8155690: Update libPNG library to the latest up-to-date
azvegint
parents:
35296
diff
changeset
|
3138 |
* channels. |
29913 | 3139 |
* |
40436
94ae0ede53a5
8155690: Update libPNG library to the latest up-to-date
azvegint
parents:
35296
diff
changeset
|
3140 |
* Note that the write API does not support interlacing, sub-8-bit pixels or |
94ae0ede53a5
8155690: Update libPNG library to the latest up-to-date
azvegint
parents:
35296
diff
changeset
|
3141 |
* most ancillary chunks. If you need to write text chunks (e.g. for copyright |
94ae0ede53a5
8155690: Update libPNG library to the latest up-to-date
azvegint
parents:
35296
diff
changeset
|
3142 |
* notices) you need to use one of the other APIs. |
29913 | 3143 |
*/ |
40436
94ae0ede53a5
8155690: Update libPNG library to the latest up-to-date
azvegint
parents:
35296
diff
changeset
|
3144 |
|
94ae0ede53a5
8155690: Update libPNG library to the latest up-to-date
azvegint
parents:
35296
diff
changeset
|
3145 |
PNG_EXPORT(245, int, png_image_write_to_memory, (png_imagep image, void *memory, |
94ae0ede53a5
8155690: Update libPNG library to the latest up-to-date
azvegint
parents:
35296
diff
changeset
|
3146 |
png_alloc_size_t * PNG_RESTRICT memory_bytes, int convert_to_8_bit, |
94ae0ede53a5
8155690: Update libPNG library to the latest up-to-date
azvegint
parents:
35296
diff
changeset
|
3147 |
const void *buffer, png_int_32 row_stride, const void *colormap)); |
94ae0ede53a5
8155690: Update libPNG library to the latest up-to-date
azvegint
parents:
35296
diff
changeset
|
3148 |
/* Write the image to the given memory buffer. The function both writes the |
94ae0ede53a5
8155690: Update libPNG library to the latest up-to-date
azvegint
parents:
35296
diff
changeset
|
3149 |
* whole PNG data stream to *memory and updates *memory_bytes with the count |
94ae0ede53a5
8155690: Update libPNG library to the latest up-to-date
azvegint
parents:
35296
diff
changeset
|
3150 |
* of bytes written. |
94ae0ede53a5
8155690: Update libPNG library to the latest up-to-date
azvegint
parents:
35296
diff
changeset
|
3151 |
* |
94ae0ede53a5
8155690: Update libPNG library to the latest up-to-date
azvegint
parents:
35296
diff
changeset
|
3152 |
* 'memory' may be NULL. In this case *memory_bytes is not read however on |
94ae0ede53a5
8155690: Update libPNG library to the latest up-to-date
azvegint
parents:
35296
diff
changeset
|
3153 |
* success the number of bytes which would have been written will still be |
94ae0ede53a5
8155690: Update libPNG library to the latest up-to-date
azvegint
parents:
35296
diff
changeset
|
3154 |
* stored in *memory_bytes. On failure *memory_bytes will contain 0. |
94ae0ede53a5
8155690: Update libPNG library to the latest up-to-date
azvegint
parents:
35296
diff
changeset
|
3155 |
* |
94ae0ede53a5
8155690: Update libPNG library to the latest up-to-date
azvegint
parents:
35296
diff
changeset
|
3156 |
* If 'memory' is not NULL it must point to memory[*memory_bytes] of |
94ae0ede53a5
8155690: Update libPNG library to the latest up-to-date
azvegint
parents:
35296
diff
changeset
|
3157 |
* writeable memory. |
94ae0ede53a5
8155690: Update libPNG library to the latest up-to-date
azvegint
parents:
35296
diff
changeset
|
3158 |
* |
94ae0ede53a5
8155690: Update libPNG library to the latest up-to-date
azvegint
parents:
35296
diff
changeset
|
3159 |
* If the function returns success memory[*memory_bytes] (if 'memory' is not |
94ae0ede53a5
8155690: Update libPNG library to the latest up-to-date
azvegint
parents:
35296
diff
changeset
|
3160 |
* NULL) contains the written PNG data. *memory_bytes will always be less |
94ae0ede53a5
8155690: Update libPNG library to the latest up-to-date
azvegint
parents:
35296
diff
changeset
|
3161 |
* than or equal to the original value. |
94ae0ede53a5
8155690: Update libPNG library to the latest up-to-date
azvegint
parents:
35296
diff
changeset
|
3162 |
* |
94ae0ede53a5
8155690: Update libPNG library to the latest up-to-date
azvegint
parents:
35296
diff
changeset
|
3163 |
* If the function returns false and *memory_bytes was not changed an error |
94ae0ede53a5
8155690: Update libPNG library to the latest up-to-date
azvegint
parents:
35296
diff
changeset
|
3164 |
* occured during write. If *memory_bytes was changed, or is not 0 if |
94ae0ede53a5
8155690: Update libPNG library to the latest up-to-date
azvegint
parents:
35296
diff
changeset
|
3165 |
* 'memory' was NULL, the write would have succeeded but for the memory |
94ae0ede53a5
8155690: Update libPNG library to the latest up-to-date
azvegint
parents:
35296
diff
changeset
|
3166 |
* buffer being too small. *memory_bytes contains the required number of |
94ae0ede53a5
8155690: Update libPNG library to the latest up-to-date
azvegint
parents:
35296
diff
changeset
|
3167 |
* bytes and will be bigger that the original value. |
94ae0ede53a5
8155690: Update libPNG library to the latest up-to-date
azvegint
parents:
35296
diff
changeset
|
3168 |
*/ |
94ae0ede53a5
8155690: Update libPNG library to the latest up-to-date
azvegint
parents:
35296
diff
changeset
|
3169 |
|
94ae0ede53a5
8155690: Update libPNG library to the latest up-to-date
azvegint
parents:
35296
diff
changeset
|
3170 |
#define png_image_write_get_memory_size(image, size, convert_to_8_bit, buffer,\ |
94ae0ede53a5
8155690: Update libPNG library to the latest up-to-date
azvegint
parents:
35296
diff
changeset
|
3171 |
row_stride, colormap)\ |
94ae0ede53a5
8155690: Update libPNG library to the latest up-to-date
azvegint
parents:
35296
diff
changeset
|
3172 |
png_image_write_to_memory(&(image), 0, &(size), convert_to_8_bit, buffer,\ |
94ae0ede53a5
8155690: Update libPNG library to the latest up-to-date
azvegint
parents:
35296
diff
changeset
|
3173 |
row_stride, colormap) |
94ae0ede53a5
8155690: Update libPNG library to the latest up-to-date
azvegint
parents:
35296
diff
changeset
|
3174 |
/* Return the amount of memory in 'size' required to compress this image. |
94ae0ede53a5
8155690: Update libPNG library to the latest up-to-date
azvegint
parents:
35296
diff
changeset
|
3175 |
* The png_image structure 'image' must be filled in as in the above |
94ae0ede53a5
8155690: Update libPNG library to the latest up-to-date
azvegint
parents:
35296
diff
changeset
|
3176 |
* function and must not be changed before the actual write call, the buffer |
94ae0ede53a5
8155690: Update libPNG library to the latest up-to-date
azvegint
parents:
35296
diff
changeset
|
3177 |
* and all other parameters must also be identical to that in the final |
94ae0ede53a5
8155690: Update libPNG library to the latest up-to-date
azvegint
parents:
35296
diff
changeset
|
3178 |
* write call. The 'size' variable need not be initialized. |
94ae0ede53a5
8155690: Update libPNG library to the latest up-to-date
azvegint
parents:
35296
diff
changeset
|
3179 |
* |
94ae0ede53a5
8155690: Update libPNG library to the latest up-to-date
azvegint
parents:
35296
diff
changeset
|
3180 |
* NOTE: the macro returns true/false, if false is returned 'size' will be |
94ae0ede53a5
8155690: Update libPNG library to the latest up-to-date
azvegint
parents:
35296
diff
changeset
|
3181 |
* set to zero and the write failed and probably will fail if tried again. |
94ae0ede53a5
8155690: Update libPNG library to the latest up-to-date
azvegint
parents:
35296
diff
changeset
|
3182 |
*/ |
94ae0ede53a5
8155690: Update libPNG library to the latest up-to-date
azvegint
parents:
35296
diff
changeset
|
3183 |
|
94ae0ede53a5
8155690: Update libPNG library to the latest up-to-date
azvegint
parents:
35296
diff
changeset
|
3184 |
/* You can pre-allocate the buffer by making sure it is of sufficient size |
94ae0ede53a5
8155690: Update libPNG library to the latest up-to-date
azvegint
parents:
35296
diff
changeset
|
3185 |
* regardless of the amount of compression achieved. The buffer size will |
94ae0ede53a5
8155690: Update libPNG library to the latest up-to-date
azvegint
parents:
35296
diff
changeset
|
3186 |
* always be bigger than the original image and it will never be filled. The |
94ae0ede53a5
8155690: Update libPNG library to the latest up-to-date
azvegint
parents:
35296
diff
changeset
|
3187 |
* following macros are provided to assist in allocating the buffer. |
94ae0ede53a5
8155690: Update libPNG library to the latest up-to-date
azvegint
parents:
35296
diff
changeset
|
3188 |
*/ |
94ae0ede53a5
8155690: Update libPNG library to the latest up-to-date
azvegint
parents:
35296
diff
changeset
|
3189 |
#define PNG_IMAGE_DATA_SIZE(image) (PNG_IMAGE_SIZE(image)+(image).height) |
94ae0ede53a5
8155690: Update libPNG library to the latest up-to-date
azvegint
parents:
35296
diff
changeset
|
3190 |
/* The number of uncompressed bytes in the PNG byte encoding of the image; |
94ae0ede53a5
8155690: Update libPNG library to the latest up-to-date
azvegint
parents:
35296
diff
changeset
|
3191 |
* uncompressing the PNG IDAT data will give this number of bytes. |
94ae0ede53a5
8155690: Update libPNG library to the latest up-to-date
azvegint
parents:
35296
diff
changeset
|
3192 |
* |
94ae0ede53a5
8155690: Update libPNG library to the latest up-to-date
azvegint
parents:
35296
diff
changeset
|
3193 |
* NOTE: while PNG_IMAGE_SIZE cannot overflow for an image in memory this |
94ae0ede53a5
8155690: Update libPNG library to the latest up-to-date
azvegint
parents:
35296
diff
changeset
|
3194 |
* macro can because of the extra bytes used in the PNG byte encoding. You |
94ae0ede53a5
8155690: Update libPNG library to the latest up-to-date
azvegint
parents:
35296
diff
changeset
|
3195 |
* need to avoid this macro if your image size approaches 2^30 in width or |
94ae0ede53a5
8155690: Update libPNG library to the latest up-to-date
azvegint
parents:
35296
diff
changeset
|
3196 |
* height. The same goes for the remainder of these macros; they all produce |
94ae0ede53a5
8155690: Update libPNG library to the latest up-to-date
azvegint
parents:
35296
diff
changeset
|
3197 |
* bigger numbers than the actual in-memory image size. |
94ae0ede53a5
8155690: Update libPNG library to the latest up-to-date
azvegint
parents:
35296
diff
changeset
|
3198 |
*/ |
94ae0ede53a5
8155690: Update libPNG library to the latest up-to-date
azvegint
parents:
35296
diff
changeset
|
3199 |
#ifndef PNG_ZLIB_MAX_SIZE |
94ae0ede53a5
8155690: Update libPNG library to the latest up-to-date
azvegint
parents:
35296
diff
changeset
|
3200 |
# define PNG_ZLIB_MAX_SIZE(b) ((b)+(((b)+7U)>>3)+(((b)+63U)>>6)+11U) |
94ae0ede53a5
8155690: Update libPNG library to the latest up-to-date
azvegint
parents:
35296
diff
changeset
|
3201 |
/* An upper bound on the number of compressed bytes given 'b' uncompressed |
94ae0ede53a5
8155690: Update libPNG library to the latest up-to-date
azvegint
parents:
35296
diff
changeset
|
3202 |
* bytes. This is based on deflateBounds() in zlib; different |
94ae0ede53a5
8155690: Update libPNG library to the latest up-to-date
azvegint
parents:
35296
diff
changeset
|
3203 |
* implementations of zlib compression may conceivably produce more data so |
94ae0ede53a5
8155690: Update libPNG library to the latest up-to-date
azvegint
parents:
35296
diff
changeset
|
3204 |
* if your zlib implementation is not zlib itself redefine this macro |
94ae0ede53a5
8155690: Update libPNG library to the latest up-to-date
azvegint
parents:
35296
diff
changeset
|
3205 |
* appropriately. |
94ae0ede53a5
8155690: Update libPNG library to the latest up-to-date
azvegint
parents:
35296
diff
changeset
|
3206 |
*/ |
94ae0ede53a5
8155690: Update libPNG library to the latest up-to-date
azvegint
parents:
35296
diff
changeset
|
3207 |
#endif |
94ae0ede53a5
8155690: Update libPNG library to the latest up-to-date
azvegint
parents:
35296
diff
changeset
|
3208 |
|
94ae0ede53a5
8155690: Update libPNG library to the latest up-to-date
azvegint
parents:
35296
diff
changeset
|
3209 |
#define PNG_IMAGE_COMPRESSED_SIZE_MAX(image)\ |
94ae0ede53a5
8155690: Update libPNG library to the latest up-to-date
azvegint
parents:
35296
diff
changeset
|
3210 |
PNG_ZLIB_MAX_SIZE((png_alloc_size_t)PNG_IMAGE_DATA_SIZE(image)) |
94ae0ede53a5
8155690: Update libPNG library to the latest up-to-date
azvegint
parents:
35296
diff
changeset
|
3211 |
/* An upper bound on the size of the data in the PNG IDAT chunks. */ |
94ae0ede53a5
8155690: Update libPNG library to the latest up-to-date
azvegint
parents:
35296
diff
changeset
|
3212 |
|
94ae0ede53a5
8155690: Update libPNG library to the latest up-to-date
azvegint
parents:
35296
diff
changeset
|
3213 |
#define PNG_IMAGE_PNG_SIZE_MAX_(image, image_size)\ |
94ae0ede53a5
8155690: Update libPNG library to the latest up-to-date
azvegint
parents:
35296
diff
changeset
|
3214 |
((8U/*sig*/+25U/*IHDR*/+16U/*gAMA*/+44U/*cHRM*/+12U/*IEND*/+\ |
94ae0ede53a5
8155690: Update libPNG library to the latest up-to-date
azvegint
parents:
35296
diff
changeset
|
3215 |
(((image).format&PNG_FORMAT_FLAG_COLORMAP)?/*colormap: PLTE, tRNS*/\ |
43321 | 3216 |
12U+3U*(image).colormap_entries/*PLTE data*/+\ |
3217 |
(((image).format&PNG_FORMAT_FLAG_ALPHA)?\ |
|
3218 |
12U/*tRNS*/+(image).colormap_entries:0U):0U)+\ |
|
40436
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|
3219 |
12U)+(12U*((image_size)/PNG_ZBUF_SIZE))/*IDAT*/+(image_size)) |
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changeset
|
3220 |
/* A helper for the following macro; if your compiler cannot handle the |
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changeset
|
3221 |
* following macro use this one with the result of |
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changeset
|
3222 |
* PNG_IMAGE_COMPRESSED_SIZE_MAX(image) as the second argument (most |
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changeset
|
3223 |
* compilers should handle this just fine.) |
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|
3224 |
*/ |
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changeset
|
3225 |
|
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changeset
|
3226 |
#define PNG_IMAGE_PNG_SIZE_MAX(image)\ |
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changeset
|
3227 |
PNG_IMAGE_PNG_SIZE_MAX_(image, PNG_IMAGE_COMPRESSED_SIZE_MAX(image)) |
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changeset
|
3228 |
/* An upper bound on the total length of the PNG data stream for 'image'. |
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changeset
|
3229 |
* The result is of type png_alloc_size_t, on 32-bit systems this may |
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changeset
|
3230 |
* overflow even though PNG_IMAGE_DATA_SIZE does not overflow; the write will |
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changeset
|
3231 |
* run out of buffer space but return a corrected size which should work. |
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|
3232 |
*/ |
29913 | 3233 |
#endif /* SIMPLIFIED_WRITE */ |
3234 |
/******************************************************************************* |
|
3235 |
* END OF SIMPLIFIED API |
|
3236 |
******************************************************************************/ |
|
3237 |
#endif /* SIMPLIFIED_{READ|WRITE} */ |
|
3238 |
||
3239 |
/******************************************************************************* |
|
35296 | 3240 |
* Section 6: IMPLEMENTATION OPTIONS |
29913 | 3241 |
******************************************************************************* |
3242 |
* |
|
3243 |
* Support for arbitrary implementation-specific optimizations. The API allows |
|
3244 |
* particular options to be turned on or off. 'Option' is the number of the |
|
3245 |
* option and 'onoff' is 0 (off) or non-0 (on). The value returned is given |
|
3246 |
* by the PNG_OPTION_ defines below. |
|
3247 |
* |
|
3248 |
* HARDWARE: normally hardware capabilites, such as the Intel SSE instructions, |
|
3249 |
* are detected at run time, however sometimes it may be impossible |
|
3250 |
* to do this in user mode, in which case it is necessary to discover |
|
3251 |
* the capabilities in an OS specific way. Such capabilities are |
|
3252 |
* listed here when libpng has support for them and must be turned |
|
3253 |
* ON by the application if present. |
|
3254 |
* |
|
3255 |
* SOFTWARE: sometimes software optimizations actually result in performance |
|
3256 |
* decrease on some architectures or systems, or with some sets of |
|
3257 |
* PNG images. 'Software' options allow such optimizations to be |
|
3258 |
* selected at run time. |
|
3259 |
*/ |
|
3260 |
#ifdef PNG_SET_OPTION_SUPPORTED |
|
3261 |
#ifdef PNG_ARM_NEON_API_SUPPORTED |
|
3262 |
# define PNG_ARM_NEON 0 /* HARDWARE: ARM Neon SIMD instructions supported */ |
|
3263 |
#endif |
|
3264 |
#define PNG_MAXIMUM_INFLATE_WINDOW 2 /* SOFTWARE: force maximum window */ |
|
3265 |
#define PNG_SKIP_sRGB_CHECK_PROFILE 4 /* SOFTWARE: Check ICC profile for sRGB */ |
|
43321 | 3266 |
#ifdef PNG_MIPS_MSA_API_SUPPORTED |
3267 |
# define PNG_MIPS_MSA 6 /* HARDWARE: MIPS Msa SIMD instructions supported */ |
|
3268 |
#endif |
|
3269 |
#define PNG_IGNORE_ADLER32 8 |
|
48280 | 3270 |
#ifdef PNG_POWERPC_VSX_API_SUPPORTED |
3271 |
# define PNG_POWERPC_VSX 10 /* HARDWARE: PowerPC VSX SIMD instructions supported */ |
|
3272 |
#endif |
|
3273 |
#define PNG_OPTION_NEXT 12 /* Next option - numbers must be even */ |
|
29913 | 3274 |
|
3275 |
/* Return values: NOTE: there are four values and 'off' is *not* zero */ |
|
3276 |
#define PNG_OPTION_UNSET 0 /* Unset - defaults to off */ |
|
3277 |
#define PNG_OPTION_INVALID 1 /* Option number out of range */ |
|
3278 |
#define PNG_OPTION_OFF 2 |
|
3279 |
#define PNG_OPTION_ON 3 |
|
3280 |
||
3281 |
PNG_EXPORT(244, int, png_set_option, (png_structrp png_ptr, int option, |
|
3282 |
int onoff)); |
|
3283 |
#endif /* SET_OPTION */ |
|
3284 |
||
3285 |
/******************************************************************************* |
|
3286 |
* END OF HARDWARE AND SOFTWARE OPTIONS |
|
3287 |
******************************************************************************/ |
|
3288 |
||
3289 |
/* Maintainer: Put new public prototypes here ^, in libpng.3, in project |
|
3290 |
* defs, and in scripts/symbols.def. |
|
2 | 3291 |
*/ |
3292 |
||
10576 | 3293 |
/* The last ordinal number (this is the *last* one already used; the next |
29913 | 3294 |
* one to use is one more than this.) |
10576 | 3295 |
*/ |
3296 |
#ifdef PNG_EXPORT_LAST_ORDINAL |
|
48280 | 3297 |
PNG_EXPORT_LAST_ORDINAL(249); |
2 | 3298 |
#endif |
3299 |
||
3300 |
#ifdef __cplusplus |
|
3301 |
} |
|
3302 |
#endif |
|
3303 |
||
3304 |
#endif /* PNG_VERSION_INFO_ONLY */ |
|
10576 | 3305 |
/* Do not put anything past this line */ |
2 | 3306 |
#endif /* PNG_H */ |