| |
| /* png.h - header file for PNG reference library |
| * |
| * libpng version 1.6.0beta06 - January 24, 2012 |
| * Copyright (c) 1998-2012 Glenn Randers-Pehrson |
| * (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger) |
| * (Version 0.88 Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.) |
| * |
| * This code is released under the libpng license (See LICENSE, below) |
| * |
| * Authors and maintainers: |
| * libpng versions 0.71, May 1995, through 0.88, January 1996: Guy Schalnat |
| * libpng versions 0.89c, June 1996, through 0.96, May 1997: Andreas Dilger |
| * libpng versions 0.97, January 1998, through 1.6.0beta06 - January 24, 2012: Glenn |
| * See also "Contributing Authors", below. |
| * |
| * Note about libpng version numbers: |
| * |
| * Due to various miscommunications, unforeseen code incompatibilities |
| * and occasional factors outside the authors' control, version numbering |
| * on the library has not always been consistent and straightforward. |
| * The following table summarizes matters since version 0.89c, which was |
| * the first widely used release: |
| * |
| * source png.h png.h shared-lib |
| * version string int version |
| * ------- ------ ----- ---------- |
| * 0.89c "1.0 beta 3" 0.89 89 1.0.89 |
| * 0.90 "1.0 beta 4" 0.90 90 0.90 [should have been 2.0.90] |
| * 0.95 "1.0 beta 5" 0.95 95 0.95 [should have been 2.0.95] |
| * 0.96 "1.0 beta 6" 0.96 96 0.96 [should have been 2.0.96] |
| * 0.97b "1.00.97 beta 7" 1.00.97 97 1.0.1 [should have been 2.0.97] |
| * 0.97c 0.97 97 2.0.97 |
| * 0.98 0.98 98 2.0.98 |
| * 0.99 0.99 98 2.0.99 |
| * 0.99a-m 0.99 99 2.0.99 |
| * 1.00 1.00 100 2.1.0 [100 should be 10000] |
| * 1.0.0 (from here on, the 100 2.1.0 [100 should be 10000] |
| * 1.0.1 png.h string is 10001 2.1.0 |
| * 1.0.1a-e identical to the 10002 from here on, the shared library |
| * 1.0.2 source version) 10002 is 2.V where V is the source code |
| * 1.0.2a-b 10003 version, except as noted. |
| * 1.0.3 10003 |
| * 1.0.3a-d 10004 |
| * 1.0.4 10004 |
| * 1.0.4a-f 10005 |
| * 1.0.5 (+ 2 patches) 10005 |
| * 1.0.5a-d 10006 |
| * 1.0.5e-r 10100 (not source compatible) |
| * 1.0.5s-v 10006 (not binary compatible) |
| * 1.0.6 (+ 3 patches) 10006 (still binary incompatible) |
| * 1.0.6d-f 10007 (still binary incompatible) |
| * 1.0.6g 10007 |
| * 1.0.6h 10007 10.6h (testing xy.z so-numbering) |
| * 1.0.6i 10007 10.6i |
| * 1.0.6j 10007 2.1.0.6j (incompatible with 1.0.0) |
| * 1.0.7beta11-14 DLLNUM 10007 2.1.0.7beta11-14 (binary compatible) |
| * 1.0.7beta15-18 1 10007 2.1.0.7beta15-18 (binary compatible) |
| * 1.0.7rc1-2 1 10007 2.1.0.7rc1-2 (binary compatible) |
| * 1.0.7 1 10007 (still compatible) |
| * 1.0.8beta1-4 1 10008 2.1.0.8beta1-4 |
| * 1.0.8rc1 1 10008 2.1.0.8rc1 |
| * 1.0.8 1 10008 2.1.0.8 |
| * 1.0.9beta1-6 1 10009 2.1.0.9beta1-6 |
| * 1.0.9rc1 1 10009 2.1.0.9rc1 |
| * 1.0.9beta7-10 1 10009 2.1.0.9beta7-10 |
| * 1.0.9rc2 1 10009 2.1.0.9rc2 |
| * 1.0.9 1 10009 2.1.0.9 |
| * 1.0.10beta1 1 10010 2.1.0.10beta1 |
| * 1.0.10rc1 1 10010 2.1.0.10rc1 |
| * 1.0.10 1 10010 2.1.0.10 |
| * 1.0.11beta1-3 1 10011 2.1.0.11beta1-3 |
| * 1.0.11rc1 1 10011 2.1.0.11rc1 |
| * 1.0.11 1 10011 2.1.0.11 |
| * 1.0.12beta1-2 2 10012 2.1.0.12beta1-2 |
| * 1.0.12rc1 2 10012 2.1.0.12rc1 |
| * 1.0.12 2 10012 2.1.0.12 |
| * 1.1.0a-f - 10100 2.1.1.0a-f (branch abandoned) |
| * 1.2.0beta1-2 2 10200 2.1.2.0beta1-2 |
| * 1.2.0beta3-5 3 10200 3.1.2.0beta3-5 |
| * 1.2.0rc1 3 10200 3.1.2.0rc1 |
| * 1.2.0 3 10200 3.1.2.0 |
| * 1.2.1beta1-4 3 10201 3.1.2.1beta1-4 |
| * 1.2.1rc1-2 3 10201 3.1.2.1rc1-2 |
| * 1.2.1 3 10201 3.1.2.1 |
| * 1.2.2beta1-6 12 10202 12.so.0.1.2.2beta1-6 |
| * 1.0.13beta1 10 10013 10.so.0.1.0.13beta1 |
| * 1.0.13rc1 10 10013 10.so.0.1.0.13rc1 |
| * 1.2.2rc1 12 10202 12.so.0.1.2.2rc1 |
| * 1.0.13 10 10013 10.so.0.1.0.13 |
| * 1.2.2 12 10202 12.so.0.1.2.2 |
| * 1.2.3rc1-6 12 10203 12.so.0.1.2.3rc1-6 |
| * 1.2.3 12 10203 12.so.0.1.2.3 |
| * 1.2.4beta1-3 13 10204 12.so.0.1.2.4beta1-3 |
| * 1.0.14rc1 13 10014 10.so.0.1.0.14rc1 |
| * 1.2.4rc1 13 10204 12.so.0.1.2.4rc1 |
| * 1.0.14 10 10014 10.so.0.1.0.14 |
| * 1.2.4 13 10204 12.so.0.1.2.4 |
| * 1.2.5beta1-2 13 10205 12.so.0.1.2.5beta1-2 |
| * 1.0.15rc1-3 10 10015 10.so.0.1.0.15rc1-3 |
| * 1.2.5rc1-3 13 10205 12.so.0.1.2.5rc1-3 |
| * 1.0.15 10 10015 10.so.0.1.0.15 |
| * 1.2.5 13 10205 12.so.0.1.2.5 |
| * 1.2.6beta1-4 13 10206 12.so.0.1.2.6beta1-4 |
| * 1.0.16 10 10016 10.so.0.1.0.16 |
| * 1.2.6 13 10206 12.so.0.1.2.6 |
| * 1.2.7beta1-2 13 10207 12.so.0.1.2.7beta1-2 |
| * 1.0.17rc1 10 10017 12.so.0.1.0.17rc1 |
| * 1.2.7rc1 13 10207 12.so.0.1.2.7rc1 |
| * 1.0.17 10 10017 12.so.0.1.0.17 |
| * 1.2.7 13 10207 12.so.0.1.2.7 |
| * 1.2.8beta1-5 13 10208 12.so.0.1.2.8beta1-5 |
| * 1.0.18rc1-5 10 10018 12.so.0.1.0.18rc1-5 |
| * 1.2.8rc1-5 13 10208 12.so.0.1.2.8rc1-5 |
| * 1.0.18 10 10018 12.so.0.1.0.18 |
| * 1.2.8 13 10208 12.so.0.1.2.8 |
| * 1.2.9beta1-3 13 10209 12.so.0.1.2.9beta1-3 |
| * 1.2.9beta4-11 13 10209 12.so.0.9[.0] |
| * 1.2.9rc1 13 10209 12.so.0.9[.0] |
| * 1.2.9 13 10209 12.so.0.9[.0] |
| * 1.2.10beta1-7 13 10210 12.so.0.10[.0] |
| * 1.2.10rc1-2 13 10210 12.so.0.10[.0] |
| * 1.2.10 13 10210 12.so.0.10[.0] |
| * 1.4.0beta1-5 14 10400 14.so.0.0[.0] |
| * 1.2.11beta1-4 13 10211 12.so.0.11[.0] |
| * 1.4.0beta7-8 14 10400 14.so.0.0[.0] |
| * 1.2.11 13 10211 12.so.0.11[.0] |
| * 1.2.12 13 10212 12.so.0.12[.0] |
| * 1.4.0beta9-14 14 10400 14.so.0.0[.0] |
| * 1.2.13 13 10213 12.so.0.13[.0] |
| * 1.4.0beta15-36 14 10400 14.so.0.0[.0] |
| * 1.4.0beta37-87 14 10400 14.so.14.0[.0] |
| * 1.4.0rc01 14 10400 14.so.14.0[.0] |
| * 1.4.0beta88-109 14 10400 14.so.14.0[.0] |
| * 1.4.0rc02-08 14 10400 14.so.14.0[.0] |
| * 1.4.0 14 10400 14.so.14.0[.0] |
| * 1.4.1beta01-03 14 10401 14.so.14.1[.0] |
| * 1.4.1rc01 14 10401 14.so.14.1[.0] |
| * 1.4.1beta04-12 14 10401 14.so.14.1[.0] |
| * 1.4.1 14 10401 14.so.14.1[.0] |
| * 1.4.2 14 10402 14.so.14.2[.0] |
| * 1.4.3 14 10403 14.so.14.3[.0] |
| * 1.4.4 14 10404 14.so.14.4[.0] |
| * 1.5.0beta01-58 15 10500 15.so.15.0[.0] |
| * 1.5.0rc01-07 15 10500 15.so.15.0[.0] |
| * 1.5.0 15 10500 15.so.15.0[.0] |
| * 1.5.1beta01-11 15 10501 15.so.15.1[.0] |
| * 1.5.1rc01-02 15 10501 15.so.15.1[.0] |
| * 1.5.1 15 10501 15.so.15.1[.0] |
| * 1.5.2beta01-03 15 10502 15.so.15.2[.0] |
| * 1.5.2rc01-03 15 10502 15.so.15.2[.0] |
| * 1.5.2 15 10502 15.so.15.2[.0] |
| * 1.5.3beta01-10 15 10503 15.so.15.3[.0] |
| * 1.5.3rc01-02 15 10503 15.so.15.3[.0] |
| * 1.5.3beta11 15 10503 15.so.15.3[.0] |
| * 1.5.3 [omitted] |
| * 1.5.4beta01-08 15 10504 15.so.15.4[.0] |
| * 1.5.4rc01 15 10504 15.so.15.4[.0] |
| * 1.5.4 15 10504 15.so.15.4[.0] |
| * 1.5.5beta01-08 15 10505 15.so.15.5[.0] |
| * 1.5.5rc01 15 10505 15.so.15.5[.0] |
| * 1.5.5 15 10505 15.so.15.5[.0] |
| * 1.5.6beta01-07 15 10506 15.so.15.6[.0] |
| * 1.5.6rc01-03 15 10506 15.so.15.6[.0] |
| * 1.5.6 15 10506 15.so.15.6[.0] |
| * 1.5.7beta01-05 15 10507 15.so.15.7[.0] |
| * 1.5.7rc01-03 15 10507 15.so.15.7[.0] |
| * 1.5.7 15 10507 15.so.15.7[.0] |
| * 1.6.0beta01-06 16 10600 16.so.16.0[.0] |
| * |
| * Henceforth the source version will match the shared-library major |
| * and minor numbers; the shared-library major version number will be |
| * used for changes in backward compatibility, as it is intended. The |
| * PNG_LIBPNG_VER macro, which is not used within libpng but is available |
| * for applications, is an unsigned integer of the form xyyzz corresponding |
| * to the source version x.y.z (leading zeros in y and z). Beta versions |
| * were given the previous public release number plus a letter, until |
| * version 1.0.6j; from then on they were given the upcoming public |
| * release number plus "betaNN" or "rcN". |
| * |
| * Binary incompatibility exists only when applications make direct access |
| * to the info_ptr or png_ptr members through png.h, and the compiled |
| * application is loaded with a different version of the library. |
| * |
| * DLLNUM will change each time there are forward or backward changes |
| * in binary compatibility (e.g., when a new feature is added). |
| * |
| * See libpng-manual.txt or libpng.3 for more information. The PNG |
| * specification is available as a W3C Recommendation and as an ISO |
| * Specification, <http://www.w3.org/TR/2003/REC-PNG-20031110/ |
| */ |
| |
| /* |
| * COPYRIGHT NOTICE, DISCLAIMER, and LICENSE: |
| * |
| * If you modify libpng you may insert additional notices immediately following |
| * this sentence. |
| * |
| * This code is released under the libpng license. |
| * |
| * libpng versions 1.2.6, August 15, 2004, through 1.6.0beta06, January 24, 2012, are |
| * Copyright (c) 2004, 2006-2012 Glenn Randers-Pehrson, and are |
| * distributed according to the same disclaimer and license as libpng-1.2.5 |
| * with the following individual added to the list of Contributing Authors: |
| * |
| * Cosmin Truta |
| * |
| * libpng versions 1.0.7, July 1, 2000, through 1.2.5, October 3, 2002, are |
| * Copyright (c) 2000-2002 Glenn Randers-Pehrson, and are |
| * distributed according to the same disclaimer and license as libpng-1.0.6 |
| * with the following individuals added to the list of Contributing Authors: |
| * |
| * Simon-Pierre Cadieux |
| * Eric S. Raymond |
| * Gilles Vollant |
| * |
| * and with the following additions to the disclaimer: |
| * |
| * There is no warranty against interference with your enjoyment of the |
| * library or against infringement. There is no warranty that our |
| * efforts or the library will fulfill any of your particular purposes |
| * or needs. This library is provided with all faults, and the entire |
| * risk of satisfactory quality, performance, accuracy, and effort is with |
| * the user. |
| * |
| * libpng versions 0.97, January 1998, through 1.0.6, March 20, 2000, are |
| * Copyright (c) 1998, 1999, 2000 Glenn Randers-Pehrson, and are |
| * distributed according to the same disclaimer and license as libpng-0.96, |
| * with the following individuals added to the list of Contributing Authors: |
| * |
| * Tom Lane |
| * Glenn Randers-Pehrson |
| * Willem van Schaik |
| * |
| * libpng versions 0.89, June 1996, through 0.96, May 1997, are |
| * Copyright (c) 1996, 1997 Andreas Dilger |
| * Distributed according to the same disclaimer and license as libpng-0.88, |
| * with the following individuals added to the list of Contributing Authors: |
| * |
| * John Bowler |
| * Kevin Bracey |
| * Sam Bushell |
| * Magnus Holmgren |
| * Greg Roelofs |
| * Tom Tanner |
| * |
| * libpng versions 0.5, May 1995, through 0.88, January 1996, are |
| * Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc. |
| * |
| * For the purposes of this copyright and license, "Contributing Authors" |
| * is defined as the following set of individuals: |
| * |
| * Andreas Dilger |
| * Dave Martindale |
| * Guy Eric Schalnat |
| * Paul Schmidt |
| * Tim Wegner |
| * |
| * The PNG Reference Library is supplied "AS IS". The Contributing Authors |
| * and Group 42, Inc. disclaim all warranties, expressed or implied, |
| * including, without limitation, the warranties of merchantability and of |
| * fitness for any purpose. The Contributing Authors and Group 42, Inc. |
| * assume no liability for direct, indirect, incidental, special, exemplary, |
| * or consequential damages, which may result from the use of the PNG |
| * Reference Library, even if advised of the possibility of such damage. |
| * |
| * Permission is hereby granted to use, copy, modify, and distribute this |
| * source code, or portions hereof, for any purpose, without fee, subject |
| * to the following restrictions: |
| * |
| * 1. The origin of this source code must not be misrepresented. |
| * |
| * 2. Altered versions must be plainly marked as such and must not |
| * be misrepresented as being the original source. |
| * |
| * 3. This Copyright notice may not be removed or altered from |
| * any source or altered source distribution. |
| * |
| * The Contributing Authors and Group 42, Inc. specifically permit, without |
| * fee, and encourage the use of this source code as a component to |
| * supporting the PNG file format in commercial products. If you use this |
| * source code in a product, acknowledgment is not required but would be |
| * appreciated. |
| */ |
| |
| /* |
| * A "png_get_copyright" function is available, for convenient use in "about" |
| * boxes and the like: |
| * |
| * printf("%s", png_get_copyright(NULL)); |
| * |
| * Also, the PNG logo (in PNG format, of course) is supplied in the |
| * files "pngbar.png" and "pngbar.jpg (88x31) and "pngnow.png" (98x31). |
| */ |
| |
| /* |
| * Libpng is OSI Certified Open Source Software. OSI Certified is a |
| * certification mark of the Open Source Initiative. |
| */ |
| |
| /* |
| * The contributing authors would like to thank all those who helped |
| * with testing, bug fixes, and patience. This wouldn't have been |
| * possible without all of you. |
| * |
| * Thanks to Frank J. T. Wojcik for helping with the documentation. |
| */ |
| |
| /* |
| * Y2K compliance in libpng: |
| * ========================= |
| * |
| * January 24, 2012 |
| * |
| * Since the PNG Development group is an ad-hoc body, we can't make |
| * an official declaration. |
| * |
| * This is your unofficial assurance that libpng from version 0.71 and |
| * upward through 1.6.0beta06 are Y2K compliant. It is my belief that |
| * earlier versions were also Y2K compliant. |
| * |
| * Libpng only has two year fields. One is a 2-byte unsigned integer |
| * that will hold years up to 65535. The other holds the date in text |
| * format, and will hold years up to 9999. |
| * |
| * The integer is |
| * "png_uint_16 year" in png_time_struct. |
| * |
| * The string is |
| * "png_char time_buffer" in png_struct |
| * |
| * There are seven time-related functions: |
| * png.c: png_convert_to_rfc_1123() in png.c |
| * (formerly png_convert_to_rfc_1152() in error) |
| * png_convert_from_struct_tm() in pngwrite.c, called in pngwrite.c |
| * png_convert_from_time_t() in pngwrite.c |
| * png_get_tIME() in pngget.c |
| * png_handle_tIME() in pngrutil.c, called in pngread.c |
| * png_set_tIME() in pngset.c |
| * png_write_tIME() in pngwutil.c, called in pngwrite.c |
| * |
| * All handle dates properly in a Y2K environment. The |
| * png_convert_from_time_t() function calls gmtime() to convert from system |
| * clock time, which returns (year - 1900), which we properly convert to |
| * the full 4-digit year. There is a possibility that applications using |
| * libpng are not passing 4-digit years into the png_convert_to_rfc_1123() |
| * function, or that they are incorrectly passing only a 2-digit year |
| * instead of "year - 1900" into the png_convert_from_struct_tm() function, |
| * but this is not under our control. The libpng documentation has always |
| * stated that it works with 4-digit years, and the APIs have been |
| * documented as such. |
| * |
| * The tIME chunk itself is also Y2K compliant. It uses a 2-byte unsigned |
| * integer to hold the year, and can hold years as large as 65535. |
| * |
| * zlib, upon which libpng depends, is also Y2K compliant. It contains |
| * no date-related code. |
| * |
| * Glenn Randers-Pehrson |
| * libpng maintainer |
| * PNG Development Group |
| */ |
| |
| #ifndef PNG_H |
| #define PNG_H |
| |
| /* This is not the place to learn how to use libpng. The file libpng-manual.txt |
| * describes how to use libpng, and the file example.c summarizes it |
| * with some code on which to build. This file is useful for looking |
| * at the actual function definitions and structure components. |
| * |
| * If you just need to read a PNG file and don't want to read the documentation |
| * skip to the end of this file and read the section entitled 'simplified API'. |
| */ |
| |
| /* Version information for png.h - this should match the version in png.c */ |
| #define PNG_LIBPNG_VER_STRING "1.6.0beta06" |
| #define PNG_HEADER_VERSION_STRING \ |
| " libpng version 1.6.0beta06 - January 24, 2012\n" |
| |
| #define PNG_LIBPNG_VER_SONUM 16 |
| #define PNG_LIBPNG_VER_DLLNUM 16 |
| |
| /* These should match the first 3 components of PNG_LIBPNG_VER_STRING: */ |
| #define PNG_LIBPNG_VER_MAJOR 1 |
| #define PNG_LIBPNG_VER_MINOR 6 |
| #define PNG_LIBPNG_VER_RELEASE 0 |
| |
| /* This should match the numeric part of the final component of |
| * PNG_LIBPNG_VER_STRING, omitting any leading zero: |
| */ |
| |
| #define PNG_LIBPNG_VER_BUILD 06 |
| |
| /* Release Status */ |
| #define PNG_LIBPNG_BUILD_ALPHA 1 |
| #define PNG_LIBPNG_BUILD_BETA 2 |
| #define PNG_LIBPNG_BUILD_RC 3 |
| #define PNG_LIBPNG_BUILD_STABLE 4 |
| #define PNG_LIBPNG_BUILD_RELEASE_STATUS_MASK 7 |
| |
| /* Release-Specific Flags */ |
| #define PNG_LIBPNG_BUILD_PATCH 8 /* Can be OR'ed with |
| PNG_LIBPNG_BUILD_STABLE only */ |
| #define PNG_LIBPNG_BUILD_PRIVATE 16 /* Cannot be OR'ed with |
| PNG_LIBPNG_BUILD_SPECIAL */ |
| #define PNG_LIBPNG_BUILD_SPECIAL 32 /* Cannot be OR'ed with |
| PNG_LIBPNG_BUILD_PRIVATE */ |
| |
| #define PNG_LIBPNG_BUILD_BASE_TYPE PNG_LIBPNG_BUILD_BETA |
| |
| /* Careful here. At one time, Guy wanted to use 082, but that would be octal. |
| * We must not include leading zeros. |
| * Versions 0.7 through 1.0.0 were in the range 0 to 100 here (only |
| * version 1.0.0 was mis-numbered 100 instead of 10000). From |
| * version 1.0.1 it's xxyyzz, where x=major, y=minor, z=release |
| */ |
| #define PNG_LIBPNG_VER 10600 /* 1.6.0 */ |
| |
| /* Library configuration: these options cannot be changed after |
| * the library has been built. |
| */ |
| #ifndef PNGLCONF_H |
| /* If pnglibconf.h is missing, you can |
| * copy scripts/pnglibconf.h.prebuilt to pnglibconf.h |
| */ |
| # include "pnglibconf.h" |
| #endif |
| |
| #ifndef PNG_VERSION_INFO_ONLY |
| /* Machine specific configuration. */ |
| # include "pngconf.h" |
| #endif |
| |
| /* |
| * Added at libpng-1.2.8 |
| * |
| * Ref MSDN: Private as priority over Special |
| * VS_FF_PRIVATEBUILD File *was not* built using standard release |
| * procedures. If this value is given, the StringFileInfo block must |
| * contain a PrivateBuild string. |
| * |
| * VS_FF_SPECIALBUILD File *was* built by the original company using |
| * standard release procedures but is a variation of the standard |
| * file of the same version number. If this value is given, the |
| * StringFileInfo block must contain a SpecialBuild string. |
| */ |
| |
| #ifdef PNG_USER_PRIVATEBUILD /* From pnglibconf.h */ |
| # define PNG_LIBPNG_BUILD_TYPE \ |
| (PNG_LIBPNG_BUILD_BASE_TYPE | PNG_LIBPNG_BUILD_PRIVATE) |
| #else |
| # ifdef PNG_LIBPNG_SPECIALBUILD |
| # define PNG_LIBPNG_BUILD_TYPE \ |
| (PNG_LIBPNG_BUILD_BASE_TYPE | PNG_LIBPNG_BUILD_SPECIAL) |
| # else |
| # define PNG_LIBPNG_BUILD_TYPE (PNG_LIBPNG_BUILD_BASE_TYPE) |
| # endif |
| #endif |
| |
| #ifndef PNG_VERSION_INFO_ONLY |
| |
| /* Inhibit C++ name-mangling for libpng functions but not for system calls. */ |
| #ifdef __cplusplus |
| extern "C" { |
| #endif /* __cplusplus */ |
| |
| /* Version information for C files, stored in png.c. This had better match |
| * the version above. |
| */ |
| #define png_libpng_ver png_get_header_ver(NULL) |
| |
| /* This file is arranged in several sections: |
| * |
| * 1. Any configuration options that can be specified by for the application |
| * code when it is built. (Build time configuration is in pnglibconf.h) |
| * 2. Type definitions (base types are defined in pngconf.h), structure |
| * definitions. |
| * 3. Exported library functions. |
| * 4. Simplified API. |
| * |
| * The library source code has additional files (principally pngpriv.h) that |
| * allow configuration of the library. |
| */ |
| /* Section 1: run time configuration |
| * See pnglibconf.h for build time configuration |
| * |
| * Run time configuration allows the application to choose between |
| * implementations of certain arithmetic APIs. The default is set |
| * at build time and recorded in pnglibconf.h, but it is safe to |
| * override these (and only these) settings. Note that this won't |
| * change what the library does, only application code, and the |
| * settings can (and probably should) be made on a per-file basis |
| * by setting the #defines before including png.h |
| * |
| * Use macros to read integers from PNG data or use the exported |
| * functions? |
| * PNG_USE_READ_MACROS: use the macros (see below) Note that |
| * the macros evaluate their argument multiple times. |
| * PNG_NO_USE_READ_MACROS: call the relevant library function. |
| * |
| * Use the alternative algorithm for compositing alpha samples that |
| * does not use division? |
| * PNG_READ_COMPOSITE_NODIV_SUPPORTED: use the 'no division' |
| * algorithm. |
| * PNG_NO_READ_COMPOSITE_NODIV: use the 'division' algorithm. |
| * |
| * How to handle benign errors if PNG_ALLOW_BENIGN_ERRORS is |
| * false? |
| * PNG_ALLOW_BENIGN_ERRORS: map calls to the benign error |
| * APIs to png_warning. |
| * Otherwise the calls are mapped to png_error. |
| */ |
| |
| /* Section 2: type definitions, including structures and compile time |
| * constants. |
| * See pngconf.h for base types that vary by machine/system |
| */ |
| |
| /* This triggers a compiler error in png.c, if png.c and png.h |
| * do not agree upon the version number. |
| */ |
| typedef char* png_libpng_version_1_6_0beta06; |
| |
| /* Basic control structions. Read libpng-manual.txt or libpng.3 for more info. |
| * |
| * png_struct is the cache of information used while reading or writing a single |
| * PNG file. One of these is always required, although the simplified API |
| * (below) hides the creation and destruction of it. |
| */ |
| typedef struct png_struct_def png_struct; |
| typedef const png_struct * png_const_structp; |
| typedef png_struct * png_structp; |
| typedef png_struct * * png_structpp; |
| |
| /* png_info contains information read from or to be written to a PNG file. One |
| * or more of these must exist while reading or creating a PNG file. The |
| * information is not used by libpng during read but is used to control what |
| * gets written when a PNG file is created. "png_get_" function calls read |
| * information during read and "png_set_" functions calls write information |
| * when creating a PNG. |
| * been moved into a separate header file that is not accessible to |
| * applications. Read libpng-manual.txt or libpng.3 for more info. |
| */ |
| typedef struct png_info_def png_info; |
| typedef png_info * png_infop; |
| typedef const png_info * png_const_infop; |
| typedef png_info * * png_infopp; |
| |
| /* Types with names ending 'p' are pointer types. The corresponding types with |
| * names ending 'rp' are identical pointer types except that the pointer is |
| * marked 'restrict', which means that it is the only pointer to the object |
| * passed to the function. Applications should not use the 'restrict' types; |
| * it is always valid to pass 'p' to a pointer with a function argument of the |
| * corresponding 'rp' type. Different compilers have different rules with |
| * regard to type matching in the presence of 'restrict'. For backward |
| * compatibility libpng callbacks never have 'restrict' in their parameters and, |
| * consequentially, writing portable application code is extremely difficult if |
| * an attempt is made to use 'restrict'. |
| */ |
| typedef png_struct * PNG_RESTRICT png_structrp; |
| typedef const png_struct * PNG_RESTRICT png_const_structrp; |
| typedef png_info * PNG_RESTRICT png_inforp; |
| typedef const png_info * PNG_RESTRICT png_const_inforp; |
| |
| /* Three color definitions. The order of the red, green, and blue, (and the |
| * exact size) is not important, although the size of the fields need to |
| * be png_byte or png_uint_16 (as defined below). |
| */ |
| typedef struct png_color_struct |
| { |
| png_byte red; |
| png_byte green; |
| png_byte blue; |
| } png_color; |
| typedef png_color * png_colorp; |
| typedef const png_color * png_const_colorp; |
| typedef png_color * * png_colorpp; |
| |
| typedef struct png_color_16_struct |
| { |
| png_byte index; /* used for palette files */ |
| png_uint_16 red; /* for use in red green blue files */ |
| png_uint_16 green; |
| png_uint_16 blue; |
| png_uint_16 gray; /* for use in grayscale files */ |
| } png_color_16; |
| typedef png_color_16 * png_color_16p; |
| typedef const png_color_16 * png_const_color_16p; |
| typedef png_color_16 * * png_color_16pp; |
| |
| typedef struct png_color_8_struct |
| { |
| png_byte red; /* for use in red green blue files */ |
| png_byte green; |
| png_byte blue; |
| png_byte gray; /* for use in grayscale files */ |
| png_byte alpha; /* for alpha channel files */ |
| } png_color_8; |
| typedef png_color_8 * png_color_8p; |
| typedef const png_color_8 * png_const_color_8p; |
| typedef png_color_8 * * png_color_8pp; |
| |
| /* |
| * The following two structures are used for the in-core representation |
| * of sPLT chunks. |
| */ |
| typedef struct png_sPLT_entry_struct |
| { |
| png_uint_16 red; |
| png_uint_16 green; |
| png_uint_16 blue; |
| png_uint_16 alpha; |
| png_uint_16 frequency; |
| } png_sPLT_entry; |
| typedef png_sPLT_entry * png_sPLT_entryp; |
| typedef const png_sPLT_entry * png_const_sPLT_entryp; |
| typedef png_sPLT_entry * * png_sPLT_entrypp; |
| |
| /* When the depth of the sPLT palette is 8 bits, the color and alpha samples |
| * occupy the LSB of their respective members, and the MSB of each member |
| * is zero-filled. The frequency member always occupies the full 16 bits. |
| */ |
| |
| typedef struct png_sPLT_struct |
| { |
| png_charp name; /* palette name */ |
| png_byte depth; /* depth of palette samples */ |
| png_sPLT_entryp entries; /* palette entries */ |
| png_int_32 nentries; /* number of palette entries */ |
| } png_sPLT_t; |
| typedef png_sPLT_t * png_sPLT_tp; |
| typedef const png_sPLT_t * png_const_sPLT_tp; |
| typedef png_sPLT_t * * png_sPLT_tpp; |
| |
| #ifdef PNG_TEXT_SUPPORTED |
| /* png_text holds the contents of a text/ztxt/itxt chunk in a PNG file, |
| * and whether that contents is compressed or not. The "key" field |
| * points to a regular zero-terminated C string. The "text" fields can be a |
| * regular C string, an empty string, or a NULL pointer. |
| * However, the structure returned by png_get_text() will always contain |
| * the "text" field as a regular zero-terminated C string (possibly |
| * empty), never a NULL pointer, so it can be safely used in printf() and |
| * other string-handling functions. Note that the "itxt_length", "lang", and |
| * "lang_key" members of the structure only exist when the library is built |
| * with iTXt chunk support. Prior to libpng-1.4.0 the library was built by |
| * default without iTXt support. Also note that when iTXt *is* supported, |
| * the "lang" and "lang_key" fields contain NULL pointers when the |
| * "compression" field contains * PNG_TEXT_COMPRESSION_NONE or |
| * PNG_TEXT_COMPRESSION_zTXt. Note that the "compression value" is not the |
| * same as what appears in the PNG tEXt/zTXt/iTXt chunk's "compression flag" |
| * which is always 0 or 1, or its "compression method" which is always 0. |
| */ |
| typedef struct png_text_struct |
| { |
| int compression; /* compression value: |
| -1: tEXt, none |
| 0: zTXt, deflate |
| 1: iTXt, none |
| 2: iTXt, deflate */ |
| png_charp key; /* keyword, 1-79 character description of "text" */ |
| png_charp text; /* comment, may be an empty string (ie "") |
| or a NULL pointer */ |
| png_size_t text_length; /* length of the text string */ |
| png_size_t itxt_length; /* length of the itxt string */ |
| png_charp lang; /* language code, 0-79 characters |
| or a NULL pointer */ |
| png_charp lang_key; /* keyword translated UTF-8 string, 0 or more |
| chars or a NULL pointer */ |
| } png_text; |
| typedef png_text * png_textp; |
| typedef const png_text * png_const_textp; |
| typedef png_text * * png_textpp; |
| #endif |
| |
| /* Supported compression types for text in PNG files (tEXt, and zTXt). |
| * The values of the PNG_TEXT_COMPRESSION_ defines should NOT be changed. */ |
| #define PNG_TEXT_COMPRESSION_NONE_WR -3 |
| #define PNG_TEXT_COMPRESSION_zTXt_WR -2 |
| #define PNG_TEXT_COMPRESSION_NONE -1 |
| #define PNG_TEXT_COMPRESSION_zTXt 0 |
| #define PNG_ITXT_COMPRESSION_NONE 1 |
| #define PNG_ITXT_COMPRESSION_zTXt 2 |
| #define PNG_TEXT_COMPRESSION_LAST 3 /* Not a valid value */ |
| |
| /* png_time is a way to hold the time in an machine independent way. |
| * Two conversions are provided, both from time_t and struct tm. There |
| * is no portable way to convert to either of these structures, as far |
| * as I know. If you know of a portable way, send it to me. As a side |
| * note - PNG has always been Year 2000 compliant! |
| */ |
| typedef struct png_time_struct |
| { |
| png_uint_16 year; /* full year, as in, 1995 */ |
| png_byte month; /* month of year, 1 - 12 */ |
| png_byte day; /* day of month, 1 - 31 */ |
| png_byte hour; /* hour of day, 0 - 23 */ |
| png_byte minute; /* minute of hour, 0 - 59 */ |
| png_byte second; /* second of minute, 0 - 60 (for leap seconds) */ |
| } png_time; |
| typedef png_time * png_timep; |
| typedef const png_time * png_const_timep; |
| typedef png_time * * png_timepp; |
| |
| #if defined(PNG_UNKNOWN_CHUNKS_SUPPORTED) || \ |
| defined(PNG_HANDLE_AS_UNKNOWN_SUPPORTED) |
| /* png_unknown_chunk is a structure to hold queued chunks for which there is |
| * no specific support. The idea is that we can use this to queue |
| * up private chunks for output even though the library doesn't actually |
| * know about their semantics. |
| */ |
| typedef struct png_unknown_chunk_t |
| { |
| png_byte name[5]; |
| png_byte *data; |
| png_size_t size; |
| |
| /* libpng-using applications should NOT directly modify this byte. */ |
| png_byte location; /* mode of operation at read time */ |
| } |
| png_unknown_chunk; |
| |
| typedef png_unknown_chunk * png_unknown_chunkp; |
| typedef const png_unknown_chunk * png_const_unknown_chunkp; |
| typedef png_unknown_chunk * * png_unknown_chunkpp; |
| #endif |
| |
| /* Values for the unknown chunk location byte */ |
| |
| #define PNG_HAVE_IHDR 0x01 |
| #define PNG_HAVE_PLTE 0x02 |
| #define PNG_AFTER_IDAT 0x08 |
| |
| /* Maximum positive integer used in PNG is (2^31)-1 */ |
| #define PNG_UINT_31_MAX ((png_uint_32)0x7fffffffL) |
| #define PNG_UINT_32_MAX ((png_uint_32)(-1)) |
| #define PNG_SIZE_MAX ((png_size_t)(-1)) |
| |
| /* These are constants for fixed point values encoded in the |
| * PNG specification manner (x100000) |
| */ |
| #define PNG_FP_1 100000 |
| #define PNG_FP_HALF 50000 |
| #define PNG_FP_MAX ((png_fixed_point)0x7fffffffL) |
| #define PNG_FP_MIN (-PNG_FP_MAX) |
| |
| /* These describe the color_type field in png_info. */ |
| /* color type masks */ |
| #define PNG_COLOR_MASK_PALETTE 1 |
| #define PNG_COLOR_MASK_COLOR 2 |
| #define PNG_COLOR_MASK_ALPHA 4 |
| |
| /* color types. Note that not all combinations are legal */ |
| #define PNG_COLOR_TYPE_GRAY 0 |
| #define PNG_COLOR_TYPE_PALETTE (PNG_COLOR_MASK_COLOR | PNG_COLOR_MASK_PALETTE) |
| #define PNG_COLOR_TYPE_RGB (PNG_COLOR_MASK_COLOR) |
| #define PNG_COLOR_TYPE_RGB_ALPHA (PNG_COLOR_MASK_COLOR | PNG_COLOR_MASK_ALPHA) |
| #define PNG_COLOR_TYPE_GRAY_ALPHA (PNG_COLOR_MASK_ALPHA) |
| /* aliases */ |
| #define PNG_COLOR_TYPE_RGBA PNG_COLOR_TYPE_RGB_ALPHA |
| #define PNG_COLOR_TYPE_GA PNG_COLOR_TYPE_GRAY_ALPHA |
| |
| /* This is for compression type. PNG 1.0-1.2 only define the single type. */ |
| #define PNG_COMPRESSION_TYPE_BASE 0 /* Deflate method 8, 32K window */ |
| #define PNG_COMPRESSION_TYPE_DEFAULT PNG_COMPRESSION_TYPE_BASE |
| |
| /* This is for filter type. PNG 1.0-1.2 only define the single type. */ |
| #define PNG_FILTER_TYPE_BASE 0 /* Single row per-byte filtering */ |
| #define PNG_INTRAPIXEL_DIFFERENCING 64 /* Used only in MNG datastreams */ |
| #define PNG_FILTER_TYPE_DEFAULT PNG_FILTER_TYPE_BASE |
| |
| /* These are for the interlacing type. These values should NOT be changed. */ |
| #define PNG_INTERLACE_NONE 0 /* Non-interlaced image */ |
| #define PNG_INTERLACE_ADAM7 1 /* Adam7 interlacing */ |
| #define PNG_INTERLACE_LAST 2 /* Not a valid value */ |
| |
| /* These are for the oFFs chunk. These values should NOT be changed. */ |
| #define PNG_OFFSET_PIXEL 0 /* Offset in pixels */ |
| #define PNG_OFFSET_MICROMETER 1 /* Offset in micrometers (1/10^6 meter) */ |
| #define PNG_OFFSET_LAST 2 /* Not a valid value */ |
| |
| /* These are for the pCAL chunk. These values should NOT be changed. */ |
| #define PNG_EQUATION_LINEAR 0 /* Linear transformation */ |
| #define PNG_EQUATION_BASE_E 1 /* Exponential base e transform */ |
| #define PNG_EQUATION_ARBITRARY 2 /* Arbitrary base exponential transform */ |
| #define PNG_EQUATION_HYPERBOLIC 3 /* Hyperbolic sine transformation */ |
| #define PNG_EQUATION_LAST 4 /* Not a valid value */ |
| |
| /* These are for the sCAL chunk. These values should NOT be changed. */ |
| #define PNG_SCALE_UNKNOWN 0 /* unknown unit (image scale) */ |
| #define PNG_SCALE_METER 1 /* meters per pixel */ |
| #define PNG_SCALE_RADIAN 2 /* radians per pixel */ |
| #define PNG_SCALE_LAST 3 /* Not a valid value */ |
| |
| /* These are for the pHYs chunk. These values should NOT be changed. */ |
| #define PNG_RESOLUTION_UNKNOWN 0 /* pixels/unknown unit (aspect ratio) */ |
| #define PNG_RESOLUTION_METER 1 /* pixels/meter */ |
| #define PNG_RESOLUTION_LAST 2 /* Not a valid value */ |
| |
| /* These are for the sRGB chunk. These values should NOT be changed. */ |
| #define PNG_sRGB_INTENT_PERCEPTUAL 0 |
| #define PNG_sRGB_INTENT_RELATIVE 1 |
| #define PNG_sRGB_INTENT_SATURATION 2 |
| #define PNG_sRGB_INTENT_ABSOLUTE 3 |
| #define PNG_sRGB_INTENT_LAST 4 /* Not a valid value */ |
| |
| /* This is for text chunks */ |
| #define PNG_KEYWORD_MAX_LENGTH 79 |
| |
| /* Maximum number of entries in PLTE/sPLT/tRNS arrays */ |
| #define PNG_MAX_PALETTE_LENGTH 256 |
| |
| /* These determine if an ancillary chunk's data has been successfully read |
| * from the PNG header, or if the application has filled in the corresponding |
| * data in the info_struct to be written into the output file. The values |
| * of the PNG_INFO_<chunk> defines should NOT be changed. |
| */ |
| #define PNG_INFO_gAMA 0x0001 |
| #define PNG_INFO_sBIT 0x0002 |
| #define PNG_INFO_cHRM 0x0004 |
| #define PNG_INFO_PLTE 0x0008 |
| #define PNG_INFO_tRNS 0x0010 |
| #define PNG_INFO_bKGD 0x0020 |
| #define PNG_INFO_hIST 0x0040 |
| #define PNG_INFO_pHYs 0x0080 |
| #define PNG_INFO_oFFs 0x0100 |
| #define PNG_INFO_tIME 0x0200 |
| #define PNG_INFO_pCAL 0x0400 |
| #define PNG_INFO_sRGB 0x0800 /* GR-P, 0.96a */ |
| #define PNG_INFO_iCCP 0x1000 /* ESR, 1.0.6 */ |
| #define PNG_INFO_sPLT 0x2000 /* ESR, 1.0.6 */ |
| #define PNG_INFO_sCAL 0x4000 /* ESR, 1.0.6 */ |
| #define PNG_INFO_IDAT 0x8000 /* ESR, 1.0.6 */ |
| |
| /* This is used for the transformation routines, as some of them |
| * change these values for the row. It also should enable using |
| * the routines for other purposes. |
| */ |
| typedef struct png_row_info_struct |
| { |
| png_uint_32 width; /* width of row */ |
| png_size_t rowbytes; /* number of bytes in row */ |
| png_byte color_type; /* color type of row */ |
| png_byte bit_depth; /* bit depth of row */ |
| png_byte channels; /* number of channels (1, 2, 3, or 4) */ |
| png_byte pixel_depth; /* bits per pixel (depth * channels) */ |
| } png_row_info; |
| |
| typedef png_row_info * png_row_infop; |
| typedef png_row_info * * png_row_infopp; |
| |
| /* These are the function types for the I/O functions and for the functions |
| * that allow the user to override the default I/O functions with his or her |
| * own. The png_error_ptr type should match that of user-supplied warning |
| * and error functions, while the png_rw_ptr type should match that of the |
| * user read/write data functions. Note that the 'write' function must not |
| * modify the buffer it is passed. The 'read' function, on the other hand, is |
| * expected to return the read data in the buffer. |
| */ |
| typedef PNG_CALLBACK(void, *png_error_ptr, (png_structp, png_const_charp)); |
| typedef PNG_CALLBACK(void, *png_rw_ptr, (png_structp, png_bytep, png_size_t)); |
| typedef PNG_CALLBACK(void, *png_flush_ptr, (png_structp)); |
| typedef PNG_CALLBACK(void, *png_read_status_ptr, (png_structp, png_uint_32, |
| int)); |
| typedef PNG_CALLBACK(void, *png_write_status_ptr, (png_structp, png_uint_32, |
| int)); |
| |
| #ifdef PNG_PROGRESSIVE_READ_SUPPORTED |
| typedef PNG_CALLBACK(void, *png_progressive_info_ptr, (png_structp, png_infop)); |
| typedef PNG_CALLBACK(void, *png_progressive_end_ptr, (png_structp, png_infop)); |
| |
| /* The following callback receives png_uint_32 row_number, int pass for the |
| * png_bytep data of the row. When transforming an interlaced image the |
| * row number is the row number within the sub-image of the interlace pass, so |
| * the value will increase to the height of the sub-image (not the full image) |
| * then reset to 0 for the next pass. |
| * |
| * Use PNG_ROW_FROM_PASS_ROW(row, pass) and PNG_COL_FROM_PASS_COL(col, pass) to |
| * find the output pixel (x,y) given an interlaced sub-image pixel |
| * (row,col,pass). (See below for these macros.) |
| */ |
| typedef PNG_CALLBACK(void, *png_progressive_row_ptr, (png_structp, png_bytep, |
| png_uint_32, int)); |
| #endif |
| |
| #if defined(PNG_READ_USER_TRANSFORM_SUPPORTED) || \ |
| defined(PNG_WRITE_USER_TRANSFORM_SUPPORTED) |
| typedef PNG_CALLBACK(void, *png_user_transform_ptr, (png_structp, png_row_infop, |
| png_bytep)); |
| #endif |
| |
| #ifdef PNG_USER_CHUNKS_SUPPORTED |
| typedef PNG_CALLBACK(int, *png_user_chunk_ptr, (png_structp, |
| png_unknown_chunkp)); |
| #endif |
| #ifdef PNG_UNKNOWN_CHUNKS_SUPPORTED |
| typedef PNG_CALLBACK(void, *png_unknown_chunk_ptr, (png_structp)); |
| #endif |
| |
| #ifdef PNG_SETJMP_SUPPORTED |
| /* This must match the function definition in <setjmp.h>, and the application |
| * must include this before png.h to obtain the definition of jmp_buf. The |
| * function is required to be PNG_NORETURN, but this is not checked. If the |
| * function does return the application will crash via an abort() or similar |
| * system level call. |
| * |
| * If you get a warning here while building the library you may need to make |
| * changes to ensure that pnglibconf.h records the calling convention used by |
| * your compiler. This may be very difficult - try using a different compiler |
| * to build the library! |
| */ |
| PNG_FUNCTION(void, (PNGCAPI *png_longjmp_ptr), PNGARG((jmp_buf, int)), typedef); |
| #endif |
| |
| /* Transform masks for the high-level interface */ |
| #define PNG_TRANSFORM_IDENTITY 0x0000 /* read and write */ |
| #define PNG_TRANSFORM_STRIP_16 0x0001 /* read only */ |
| #define PNG_TRANSFORM_STRIP_ALPHA 0x0002 /* read only */ |
| #define PNG_TRANSFORM_PACKING 0x0004 /* read and write */ |
| #define PNG_TRANSFORM_PACKSWAP 0x0008 /* read and write */ |
| #define PNG_TRANSFORM_EXPAND 0x0010 /* read only */ |
| #define PNG_TRANSFORM_INVERT_MONO 0x0020 /* read and write */ |
| #define PNG_TRANSFORM_SHIFT 0x0040 /* read and write */ |
| #define PNG_TRANSFORM_BGR 0x0080 /* read and write */ |
| #define PNG_TRANSFORM_SWAP_ALPHA 0x0100 /* read and write */ |
| #define PNG_TRANSFORM_SWAP_ENDIAN 0x0200 /* read and write */ |
| #define PNG_TRANSFORM_INVERT_ALPHA 0x0400 /* read and write */ |
| #define PNG_TRANSFORM_STRIP_FILLER 0x0800 /* write only */ |
| /* Added to libpng-1.2.34 */ |
| #define PNG_TRANSFORM_STRIP_FILLER_BEFORE PNG_TRANSFORM_STRIP_FILLER |
| #define PNG_TRANSFORM_STRIP_FILLER_AFTER 0x1000 /* write only */ |
| /* Added to libpng-1.4.0 */ |
| #define PNG_TRANSFORM_GRAY_TO_RGB 0x2000 /* read only */ |
| /* Added to libpng-1.5.4 */ |
| #define PNG_TRANSFORM_EXPAND_16 0x4000 /* read only */ |
| #define PNG_TRANSFORM_SCALE_16 0x8000 /* read only */ |
| |
| /* Flags for MNG supported features */ |
| #define PNG_FLAG_MNG_EMPTY_PLTE 0x01 |
| #define PNG_FLAG_MNG_FILTER_64 0x04 |
| #define PNG_ALL_MNG_FEATURES 0x05 |
| |
| /* NOTE: prior to 1.5 these functions had no 'API' style declaration, |
| * this allowed the zlib default functions to be used on Windows |
| * platforms. In 1.5 the zlib default malloc (which just calls malloc and |
| * ignores the first argument) should be completely compatible with the |
| * following. |
| */ |
| typedef PNG_CALLBACK(png_voidp, *png_malloc_ptr, (png_structp, |
| png_alloc_size_t)); |
| typedef PNG_CALLBACK(void, *png_free_ptr, (png_structp, png_voidp)); |
| |
| /* Section 3: exported functions |
| * Here are the function definitions most commonly used. This is not |
| * the place to find out how to use libpng. See libpng-manual.txt for the |
| * full explanation, see example.c for the summary. This just provides |
| * a simple one line description of the use of each function. |
| * |
| * The PNG_EXPORT() and PNG_EXPORTA() macros used below are defined in |
| * pngconf.h and in the *.dfn files in the scripts directory. |
| * |
| * PNG_EXPORT(ordinal, type, name, (args)); |
| * |
| * ordinal: ordinal that is used while building |
| * *.def files. The ordinal value is only |
| * relevant when preprocessing png.h with |
| * the *.dfn files for building symbol table |
| * entries, and are removed by pngconf.h. |
| * type: return type of the function |
| * name: function name |
| * args: function arguments, with types |
| * |
| * When we wish to append attributes to a function prototype we use |
| * the PNG_EXPORTA() macro instead. |
| * |
| * PNG_EXPORTA(ordinal, type, name, (args), attributes); |
| * |
| * ordinal, type, name, and args: same as in PNG_EXPORT(). |
| * attributes: function attributes |
| */ |
| |
| /* Returns the version number of the library */ |
| PNG_EXPORT(1, png_uint_32, png_access_version_number, (void)); |
| |
| /* Tell lib we have already handled the first <num_bytes> magic bytes. |
| * Handling more than 8 bytes from the beginning of the file is an error. |
| */ |
| PNG_EXPORT(2, void, png_set_sig_bytes, (png_structrp png_ptr, int num_bytes)); |
| |
| /* Check sig[start] through sig[start + num_to_check - 1] to see if it's a |
| * PNG file. Returns zero if the supplied bytes match the 8-byte PNG |
| * signature, and non-zero otherwise. Having num_to_check == 0 or |
| * start > 7 will always fail (ie return non-zero). |
| */ |
| PNG_EXPORT(3, int, png_sig_cmp, (png_const_bytep sig, png_size_t start, |
| png_size_t num_to_check)); |
| |
| /* Simple signature checking function. This is the same as calling |
| * png_check_sig(sig, n) := !png_sig_cmp(sig, 0, n). |
| */ |
| #define png_check_sig(sig, n) !png_sig_cmp((sig), 0, (n)) |
| |
| /* Allocate and initialize png_ptr struct for reading, and any other memory. */ |
| PNG_EXPORTA(4, png_structp, png_create_read_struct, |
| (png_const_charp user_png_ver, png_voidp error_ptr, |
| png_error_ptr error_fn, png_error_ptr warn_fn), |
| PNG_ALLOCATED); |
| |
| /* Allocate and initialize png_ptr struct for writing, and any other memory */ |
| PNG_EXPORTA(5, png_structp, png_create_write_struct, |
| (png_const_charp user_png_ver, png_voidp error_ptr, png_error_ptr error_fn, |
| png_error_ptr warn_fn), |
| PNG_ALLOCATED); |
| |
| PNG_EXPORT(6, png_size_t, png_get_compression_buffer_size, |
| (png_const_structrp png_ptr)); |
| |
| PNG_EXPORT(7, void, png_set_compression_buffer_size, (png_structrp png_ptr, |
| png_size_t size)); |
| |
| /* Moved from pngconf.h in 1.4.0 and modified to ensure setjmp/longjmp |
| * match up. |
| */ |
| #ifdef PNG_SETJMP_SUPPORTED |
| /* This function returns the jmp_buf built in to *png_ptr. It must be |
| * supplied with an appropriate 'longjmp' function to use on that jmp_buf |
| * unless the default error function is overridden in which case NULL is |
| * acceptable. The size of the jmp_buf is checked against the actual size |
| * allocated by the library - the call will return NULL on a mismatch |
| * indicating an ABI mismatch. |
| */ |
| PNG_EXPORT(8, jmp_buf*, png_set_longjmp_fn, (png_structrp png_ptr, |
| png_longjmp_ptr longjmp_fn, size_t jmp_buf_size)); |
| # define png_jmpbuf(png_ptr) \ |
| (*png_set_longjmp_fn((png_ptr), longjmp, sizeof (jmp_buf))) |
| #else |
| # define png_jmpbuf(png_ptr) \ |
| (LIBPNG_WAS_COMPILED_WITH__PNG_NO_SETJMP) |
| #endif |
| /* This function should be used by libpng applications in place of |
| * longjmp(png_ptr->jmpbuf, val). If longjmp_fn() has been set, it |
| * will use it; otherwise it will call PNG_ABORT(). This function was |
| * added in libpng-1.5.0. |
| */ |
| PNG_EXPORTA(9, void, png_longjmp, (png_const_structrp png_ptr, int val), |
| PNG_NORETURN); |
| |
| #ifdef PNG_READ_SUPPORTED |
| /* Reset the compression stream */ |
| PNG_EXPORT(10, int, png_reset_zstream, (png_structrp png_ptr)); |
| #endif |
| |
| /* New functions added in libpng-1.0.2 (not enabled by default until 1.2.0) */ |
| #ifdef PNG_USER_MEM_SUPPORTED |
| PNG_EXPORTA(11, png_structp, png_create_read_struct_2, |
| (png_const_charp user_png_ver, png_voidp error_ptr, png_error_ptr error_fn, |
| png_error_ptr warn_fn, |
| png_voidp mem_ptr, png_malloc_ptr malloc_fn, png_free_ptr free_fn), |
| PNG_ALLOCATED); |
| PNG_EXPORTA(12, png_structp, png_create_write_struct_2, |
| (png_const_charp user_png_ver, png_voidp error_ptr, png_error_ptr error_fn, |
| png_error_ptr warn_fn, |
| png_voidp mem_ptr, png_malloc_ptr malloc_fn, png_free_ptr free_fn), |
| PNG_ALLOCATED); |
| #endif |
| |
| /* Write the PNG file signature. */ |
| PNG_EXPORT(13, void, png_write_sig, (png_structrp png_ptr)); |
| |
| /* Write a PNG chunk - size, type, (optional) data, CRC. */ |
| PNG_EXPORT(14, void, png_write_chunk, (png_structrp png_ptr, png_const_bytep |
| chunk_name, png_const_bytep data, png_size_t length)); |
| |
| /* Write the start of a PNG chunk - length and chunk name. */ |
| PNG_EXPORT(15, void, png_write_chunk_start, (png_structrp png_ptr, |
| png_const_bytep chunk_name, png_uint_32 length)); |
| |
| /* Write the data of a PNG chunk started with png_write_chunk_start(). */ |
| PNG_EXPORT(16, void, png_write_chunk_data, (png_structrp png_ptr, |
| png_const_bytep data, png_size_t length)); |
| |
| /* Finish a chunk started with png_write_chunk_start() (includes CRC). */ |
| PNG_EXPORT(17, void, png_write_chunk_end, (png_structrp png_ptr)); |
| |
| /* Allocate and initialize the info structure */ |
| PNG_EXPORTA(18, png_infop, png_create_info_struct, (png_const_structrp png_ptr), |
| PNG_ALLOCATED); |
| |
| /* DEPRECATED: this function allowed init structures to be created using the |
| * default allocation method (typically malloc). Use is deprecated in 1.6.0 and |
| * the API will be removed in the future. |
| */ |
| PNG_EXPORTA(19, void, png_info_init_3, (png_infopp info_ptr, |
| png_size_t png_info_struct_size), PNG_DEPRECATED); |
| |
| /* Writes all the PNG information before the image. */ |
| PNG_EXPORT(20, void, png_write_info_before_PLTE, |
| (png_structrp png_ptr, png_inforp info_ptr)); |
| PNG_EXPORT(21, void, png_write_info, |
| (png_structrp png_ptr, png_inforp info_ptr)); |
| |
| #ifdef PNG_SEQUENTIAL_READ_SUPPORTED |
| /* Read the information before the actual image data. */ |
| PNG_EXPORT(22, void, png_read_info, |
| (png_structrp png_ptr, png_inforp info_ptr)); |
| #endif |
| |
| #ifdef PNG_TIME_RFC1123_SUPPORTED |
| /* Convert to a US string format: there is no localization support in this |
| * routine. The original implementation used a 29 character buffer in |
| * png_struct, this will be removed in future versions. |
| */ |
| #if PNG_LIBPNG_VER < 10700 |
| PNG_EXPORTA(23, png_const_charp, png_convert_to_rfc1123, (png_structrp png_ptr, |
| png_const_timep ptime),PNG_DEPRECATED); |
| #endif |
| PNG_EXPORT(241, int, png_convert_to_rfc1123_buffer, (char out[29], |
| png_const_timep ptime)); |
| #endif |
| |
| #ifdef PNG_CONVERT_tIME_SUPPORTED |
| /* Convert from a struct tm to png_time */ |
| PNG_EXPORT(24, void, png_convert_from_struct_tm, (png_timep ptime, |
| const struct tm * ttime)); |
| |
| /* Convert from time_t to png_time. Uses gmtime() */ |
| PNG_EXPORT(25, void, png_convert_from_time_t, (png_timep ptime, time_t ttime)); |
| #endif /* PNG_CONVERT_tIME_SUPPORTED */ |
| |
| #ifdef PNG_READ_EXPAND_SUPPORTED |
| /* Expand data to 24-bit RGB, or 8-bit grayscale, with alpha if available. */ |
| PNG_EXPORT(26, void, png_set_expand, (png_structrp png_ptr)); |
| PNG_EXPORT(27, void, png_set_expand_gray_1_2_4_to_8, (png_structrp png_ptr)); |
| PNG_EXPORT(28, void, png_set_palette_to_rgb, (png_structrp png_ptr)); |
| PNG_EXPORT(29, void, png_set_tRNS_to_alpha, (png_structrp png_ptr)); |
| #endif |
| |
| #ifdef PNG_READ_EXPAND_16_SUPPORTED |
| /* Expand to 16-bit channels, forces conversion of palette to RGB and expansion |
| * of a tRNS chunk if present. |
| */ |
| PNG_EXPORT(221, void, png_set_expand_16, (png_structrp png_ptr)); |
| #endif |
| |
| #if defined(PNG_READ_BGR_SUPPORTED) || defined(PNG_WRITE_BGR_SUPPORTED) |
| /* Use blue, green, red order for pixels. */ |
| PNG_EXPORT(30, void, png_set_bgr, (png_structrp png_ptr)); |
| #endif |
| |
| #ifdef PNG_READ_GRAY_TO_RGB_SUPPORTED |
| /* Expand the grayscale to 24-bit RGB if necessary. */ |
| PNG_EXPORT(31, void, png_set_gray_to_rgb, (png_structrp png_ptr)); |
| #endif |
| |
| #ifdef PNG_READ_RGB_TO_GRAY_SUPPORTED |
| /* Reduce RGB to grayscale. */ |
| #define PNG_ERROR_ACTION_NONE 1 |
| #define PNG_ERROR_ACTION_WARN 2 |
| #define PNG_ERROR_ACTION_ERROR 3 |
| #define PNG_RGB_TO_GRAY_DEFAULT (-1)/*for red/green coefficients*/ |
| |
| PNG_FP_EXPORT(32, void, png_set_rgb_to_gray, (png_structrp png_ptr, |
| int error_action, double red, double green)); |
| PNG_FIXED_EXPORT(33, void, png_set_rgb_to_gray_fixed, (png_structrp png_ptr, |
| int error_action, png_fixed_point red, png_fixed_point green)); |
| |
| PNG_EXPORT(34, png_byte, png_get_rgb_to_gray_status, (png_const_structrp |
| png_ptr)); |
| #endif |
| |
| #ifdef PNG_BUILD_GRAYSCALE_PALETTE_SUPPORTED |
| PNG_EXPORT(35, void, png_build_grayscale_palette, (int bit_depth, |
| png_colorp palette)); |
| #endif |
| |
| #ifdef PNG_READ_ALPHA_MODE_SUPPORTED |
| /* How the alpha channel is interpreted - this affects how the color channels of |
| * a PNG file are returned when an alpha channel, or tRNS chunk in a palette |
| * file, is present. |
| * |
| * This has no effect on the way pixels are written into a PNG output |
| * datastream. The color samples in a PNG datastream are never premultiplied |
| * with the alpha samples. |
| * |
| * The default is to return data according to the PNG specification: the alpha |
| * channel is a linear measure of the contribution of the pixel to the |
| * corresponding composited pixel. The gamma encoded color channels must be |
| * scaled according to the contribution and to do this it is necessary to undo |
| * the encoding, scale the color values, perform the composition and reencode |
| * the values. This is the 'PNG' mode. |
| * |
| * The alternative is to 'associate' the alpha with the color information by |
| * storing color channel values that have been scaled by the alpha. The |
| * advantage is that the color channels can be resampled (the image can be |
| * scaled) in this form. The disadvantage is that normal practice is to store |
| * linear, not (gamma) encoded, values and this requires 16-bit channels for |
| * still images rather than the 8-bit channels that are just about sufficient if |
| * gamma encoding is used. In addition all non-transparent pixel values, |
| * including completely opaque ones, must be gamma encoded to produce the final |
| * image. This is the 'STANDARD', 'ASSOCIATED' or 'PREMULTIPLIED' mode (the |
| * latter being the two common names for associated alpha color channels.) |
| * |
| * Since it is not necessary to perform arithmetic on opaque color values so |
| * long as they are not to be resampled and are in the final color space it is |
| * possible to optimize the handling of alpha by storing the opaque pixels in |
| * the PNG format (adjusted for the output color space) while storing partially |
| * opaque pixels in the standard, linear, format. The accuracy required for |
| * standard alpha composition is relatively low, because the pixels are |
| * isolated, therefore typically the accuracy loss in storing 8-bit linear |
| * values is acceptable. (This is not true if the alpha channel is used to |
| * simulate transparency over large areas - use 16 bits or the PNG mode in |
| * this case!) This is the 'OPTIMIZED' mode. For this mode a pixel is |
| * treated as opaque only if the alpha value is equal to the maximum value. |
| * |
| * The final choice is to gamma encode the alpha channel as well. This is |
| * broken because, in practice, no implementation that uses this choice |
| * correctly undoes the encoding before handling alpha composition. Use this |
| * choice only if other serious errors in the software or hardware you use |
| * mandate it; the typical serious error is for dark halos to appear around |
| * opaque areas of the composited PNG image because of arithmetic overflow. |
| * |
| * The API function png_set_alpha_mode specifies which of these choices to use |
| * with an enumerated 'mode' value and the gamma of the required output: |
| */ |
| #define PNG_ALPHA_PNG 0 /* according to the PNG standard */ |
| #define PNG_ALPHA_STANDARD 1 /* according to Porter/Duff */ |
| #define PNG_ALPHA_ASSOCIATED 1 /* as above; this is the normal practice */ |
| #define PNG_ALPHA_PREMULTIPLIED 1 /* as above */ |
| #define PNG_ALPHA_OPTIMIZED 2 /* 'PNG' for opaque pixels, else 'STANDARD' */ |
| #define PNG_ALPHA_BROKEN 3 /* the alpha channel is gamma encoded */ |
| |
| PNG_FP_EXPORT(227, void, png_set_alpha_mode, (png_structrp png_ptr, int mode, |
| double output_gamma)); |
| PNG_FIXED_EXPORT(228, void, png_set_alpha_mode_fixed, (png_structrp png_ptr, |
| int mode, png_fixed_point output_gamma)); |
| #endif |
| |
| #if defined(PNG_READ_GAMMA_SUPPORTED) || defined(PNG_READ_ALPHA_MODE_SUPPORTED) |
| /* The output_gamma value is a screen gamma in libpng terminology: it expresses |
| * how to decode the output values, not how they are encoded. The values used |
| * correspond to the normal numbers used to describe the overall gamma of a |
| * computer display system; for example 2.2 for an sRGB conformant system. The |
| * values are scaled by 100000 in the _fixed version of the API (so 220000 for |
| * sRGB.) |
| * |
| * The inverse of the value is always used to provide a default for the PNG file |
| * encoding if it has no gAMA chunk and if png_set_gamma() has not been called |
| * to override the PNG gamma information. |
| * |
| * When the ALPHA_OPTIMIZED mode is selected the output gamma is used to encode |
| * opaque pixels however pixels with lower alpha values are not encoded, |
| * regardless of the output gamma setting. |
| * |
| * When the standard Porter Duff handling is requested with mode 1 the output |
| * encoding is set to be linear and the output_gamma value is only relevant |
| * as a default for input data that has no gamma information. The linear output |
| * encoding will be overridden if png_set_gamma() is called - the results may be |
| * highly unexpected! |
| * |
| * The following numbers are derived from the sRGB standard and the research |
| * behind it. sRGB is defined to be approximated by a PNG gAMA chunk value of |
| * 0.45455 (1/2.2) for PNG. The value implicitly includes any viewing |
| * correction required to take account of any differences in the color |
| * environment of the original scene and the intended display environment; the |
| * value expresses how to *decode* the image for display, not how the original |
| * data was *encoded*. |
| * |
| * sRGB provides a peg for the PNG standard by defining a viewing environment. |
| * sRGB itself, and earlier TV standards, actually use a more complex transform |
| * (a linear portion then a gamma 2.4 power law) than PNG can express. (PNG is |
| * limited to simple power laws.) By saying that an image for direct display on |
| * an sRGB conformant system should be stored with a gAMA chunk value of 45455 |
| * (11.3.3.2 and 11.3.3.5 of the ISO PNG specification) the PNG specification |
| * makes it possible to derive values for other display systems and |
| * environments. |
| * |
| * The Mac value is deduced from the sRGB based on an assumption that the actual |
| * extra viewing correction used in early Mac display systems was implemented as |
| * a power 1.45 lookup table. |
| * |
| * Any system where a programmable lookup table is used or where the behavior of |
| * the final display device characteristics can be changed requires system |
| * specific code to obtain the current characteristic. However this can be |
| * difficult and most PNG gamma correction only requires an approximate value. |
| * |
| * By default, if png_set_alpha_mode() is not called, libpng assumes that all |
| * values are unencoded, linear, values and that the output device also has a |
| * linear characteristic. This is only very rarely correct - it is invariably |
| * better to call png_set_alpha_mode() with PNG_DEFAULT_sRGB than rely on the |
| * default if you don't know what the right answer is! |
| * |
| * The special value PNG_GAMMA_MAC_18 indicates an older Mac system (pre Mac OS |
| * 10.6) which used a correction table to implement a somewhat lower gamma on an |
| * otherwise sRGB system. |
| * |
| * Both these values are reserved (not simple gamma values) in order to allow |
| * more precise correction internally in the future. |
| * |
| * NOTE: the following values can be passed to either the fixed or floating |
| * point APIs, but the floating point API will also accept floating point |
| * values. |
| */ |
| #define PNG_DEFAULT_sRGB -1 /* sRGB gamma and color space */ |
| #define PNG_GAMMA_MAC_18 -2 /* Old Mac '1.8' gamma and color space */ |
| #define PNG_GAMMA_sRGB 220000 /* Television standards--matches sRGB gamma */ |
| #define PNG_GAMMA_LINEAR PNG_FP_1 /* Linear */ |
| #endif |
| |
| /* The following are examples of calls to png_set_alpha_mode to achieve the |
| * required overall gamma correction and, where necessary, alpha |
| * premultiplication. |
| * |
| * png_set_alpha_mode(pp, PNG_ALPHA_PNG, PNG_DEFAULT_sRGB); |
| * This is the default libpng handling of the alpha channel - it is not |
| * pre-multiplied into the color components. In addition the call states |
| * that the output is for a sRGB system and causes all PNG files without gAMA |
| * chunks to be assumed to be encoded using sRGB. |
| * |
| * png_set_alpha_mode(pp, PNG_ALPHA_PNG, PNG_GAMMA_MAC); |
| * In this case the output is assumed to be something like an sRGB conformant |
| * display preceeded by a power-law lookup table of power 1.45. This is how |
| * early Mac systems behaved. |
| * |
| * png_set_alpha_mode(pp, PNG_ALPHA_STANDARD, PNG_GAMMA_LINEAR); |
| * This is the classic Jim Blinn approach and will work in academic |
| * environments where everything is done by the book. It has the shortcoming |
| * of assuming that input PNG data with no gamma information is linear - this |
| * is unlikely to be correct unless the PNG files where generated locally. |
| * Most of the time the output precision will be so low as to show |
| * significant banding in dark areas of the image. |
| * |
| * png_set_expand_16(pp); |
| * png_set_alpha_mode(pp, PNG_ALPHA_STANDARD, PNG_DEFAULT_sRGB); |
| * This is a somewhat more realistic Jim Blinn inspired approach. PNG files |
| * are assumed to have the sRGB encoding if not marked with a gamma value and |
| * the output is always 16 bits per component. This permits accurate scaling |
| * and processing of the data. If you know that your input PNG files were |
| * generated locally you might need to replace PNG_DEFAULT_sRGB with the |
| * correct value for your system. |
| * |
| * png_set_alpha_mode(pp, PNG_ALPHA_OPTIMIZED, PNG_DEFAULT_sRGB); |
| * If you just need to composite the PNG image onto an existing background |
| * and if you control the code that does this you can use the optimization |
| * setting. In this case you just copy completely opaque pixels to the |
| * output. For pixels that are not completely transparent (you just skip |
| * those) you do the composition math using png_composite or png_composite_16 |
| * below then encode the resultant 8-bit or 16-bit values to match the output |
| * encoding. |
| * |
| * Other cases |
| * If neither the PNG nor the standard linear encoding work for you because |
| * of the software or hardware you use then you have a big problem. The PNG |
| * case will probably result in halos around the image. The linear encoding |
| * will probably result in a washed out, too bright, image (it's actually too |
| * contrasty.) Try the ALPHA_OPTIMIZED mode above - this will probably |
| * substantially reduce the halos. Alternatively try: |
| * |
| * png_set_alpha_mode(pp, PNG_ALPHA_BROKEN, PNG_DEFAULT_sRGB); |
| * This option will also reduce the halos, but there will be slight dark |
| * halos round the opaque parts of the image where the background is light. |
| * In the OPTIMIZED mode the halos will be light halos where the background |
| * is dark. Take your pick - the halos are unavoidable unless you can get |
| * your hardware/software fixed! (The OPTIMIZED approach is slightly |
| * faster.) |
| * |
| * When the default gamma of PNG files doesn't match the output gamma. |
| * If you have PNG files with no gamma information png_set_alpha_mode allows |
| * you to provide a default gamma, but it also sets the ouput gamma to the |
| * matching value. If you know your PNG files have a gamma that doesn't |
| * match the output you can take advantage of the fact that |
| * png_set_alpha_mode always sets the output gamma but only sets the PNG |
| * default if it is not already set: |
| * |
| * png_set_alpha_mode(pp, PNG_ALPHA_PNG, PNG_DEFAULT_sRGB); |
| * png_set_alpha_mode(pp, PNG_ALPHA_PNG, PNG_GAMMA_MAC); |
| * The first call sets both the default and the output gamma values, the |
| * second call overrides the output gamma without changing the default. This |
| * is easier than achieving the same effect with png_set_gamma. You must use |
| * PNG_ALPHA_PNG for the first call - internal checking in png_set_alpha will |
| * fire if more than one call to png_set_alpha_mode and png_set_background is |
| * made in the same read operation, however multiple calls with PNG_ALPHA_PNG |
| * are ignored. |
| */ |
| |
| #ifdef PNG_READ_STRIP_ALPHA_SUPPORTED |
| PNG_EXPORT(36, void, png_set_strip_alpha, (png_structrp png_ptr)); |
| #endif |
| |
| #if defined(PNG_READ_SWAP_ALPHA_SUPPORTED) || \ |
| defined(PNG_WRITE_SWAP_ALPHA_SUPPORTED) |
| PNG_EXPORT(37, void, png_set_swap_alpha, (png_structrp png_ptr)); |
| #endif |
| |
| #if defined(PNG_READ_INVERT_ALPHA_SUPPORTED) || \ |
| defined(PNG_WRITE_INVERT_ALPHA_SUPPORTED) |
| PNG_EXPORT(38, void, png_set_invert_alpha, (png_structrp png_ptr)); |
| #endif |
| |
| #if defined(PNG_READ_FILLER_SUPPORTED) || defined(PNG_WRITE_FILLER_SUPPORTED) |
| /* Add a filler byte to 8-bit Gray or 24-bit RGB images. */ |
| PNG_EXPORT(39, void, png_set_filler, (png_structrp png_ptr, png_uint_32 filler, |
| int flags)); |
| /* The values of the PNG_FILLER_ defines should NOT be changed */ |
| # define PNG_FILLER_BEFORE 0 |
| # define PNG_FILLER_AFTER 1 |
| /* Add an alpha byte to 8-bit Gray or 24-bit RGB images. */ |
| PNG_EXPORT(40, void, png_set_add_alpha, (png_structrp png_ptr, |
| png_uint_32 filler, int flags)); |
| #endif /* PNG_READ_FILLER_SUPPORTED || PNG_WRITE_FILLER_SUPPORTED */ |
| |
| #if defined(PNG_READ_SWAP_SUPPORTED) || defined(PNG_WRITE_SWAP_SUPPORTED) |
| /* Swap bytes in 16-bit depth files. */ |
| PNG_EXPORT(41, void, png_set_swap, (png_structrp png_ptr)); |
| #endif |
| |
| #if defined(PNG_READ_PACK_SUPPORTED) || defined(PNG_WRITE_PACK_SUPPORTED) |
| /* Use 1 byte per pixel in 1, 2, or 4-bit depth files. */ |
| PNG_EXPORT(42, void, png_set_packing, (png_structrp png_ptr)); |
| #endif |
| |
| #if defined(PNG_READ_PACKSWAP_SUPPORTED) || \ |
| defined(PNG_WRITE_PACKSWAP_SUPPORTED) |
| /* Swap packing order of pixels in bytes. */ |
| PNG_EXPORT(43, void, png_set_packswap, (png_structrp png_ptr)); |
| #endif |
| |
| #if defined(PNG_READ_SHIFT_SUPPORTED) || defined(PNG_WRITE_SHIFT_SUPPORTED) |
| /* Converts files to legal bit depths. */ |
| PNG_EXPORT(44, void, png_set_shift, (png_structrp png_ptr, png_const_color_8p |
| true_bits)); |
| #endif |
| |
| #if defined(PNG_READ_INTERLACING_SUPPORTED) || \ |
| defined(PNG_WRITE_INTERLACING_SUPPORTED) |
| /* Have the code handle the interlacing. Returns the number of passes. |
| * MUST be called before png_read_update_info or png_start_read_image, |
| * otherwise it will not have the desired effect. Note that it is still |
| * necessary to call png_read_row or png_read_rows png_get_image_height |
| * times for each pass. |
| */ |
| PNG_EXPORT(45, int, png_set_interlace_handling, (png_structrp png_ptr)); |
| #endif |
| |
| #if defined(PNG_READ_INVERT_SUPPORTED) || defined(PNG_WRITE_INVERT_SUPPORTED) |
| /* Invert monochrome files */ |
| PNG_EXPORT(46, void, png_set_invert_mono, (png_structrp png_ptr)); |
| #endif |
| |
| #ifdef PNG_READ_BACKGROUND_SUPPORTED |
| /* Handle alpha and tRNS by replacing with a background color. Prior to |
| * libpng-1.5.4 this API must not be called before the PNG file header has been |
| * read. Doing so will result in unexpected behavior and possible warnings or |
| * errors if the PNG file contains a bKGD chunk. |
| */ |
| PNG_FP_EXPORT(47, void, png_set_background, (png_structrp png_ptr, |
| png_const_color_16p background_color, int background_gamma_code, |
| int need_expand, double background_gamma)); |
| PNG_FIXED_EXPORT(215, void, png_set_background_fixed, (png_structrp png_ptr, |
| png_const_color_16p background_color, int background_gamma_code, |
| int need_expand, png_fixed_point background_gamma)); |
| #endif |
| #ifdef PNG_READ_BACKGROUND_SUPPORTED |
| # define PNG_BACKGROUND_GAMMA_UNKNOWN 0 |
| # define PNG_BACKGROUND_GAMMA_SCREEN 1 |
| # define PNG_BACKGROUND_GAMMA_FILE 2 |
| # define PNG_BACKGROUND_GAMMA_UNIQUE 3 |
| #endif |
| |
| #ifdef PNG_READ_SCALE_16_TO_8_SUPPORTED |
| /* Scale a 16-bit depth file down to 8-bit, accurately. */ |
| PNG_EXPORT(229, void, png_set_scale_16, (png_structrp png_ptr)); |
| #endif |
| |
| #ifdef PNG_READ_STRIP_16_TO_8_SUPPORTED |
| #define PNG_READ_16_TO_8 SUPPORTED /* Name prior to 1.5.4 */ |
| /* Strip the second byte of information from a 16-bit depth file. */ |
| PNG_EXPORT(48, void, png_set_strip_16, (png_structrp png_ptr)); |
| #endif |
| |
| #ifdef PNG_READ_QUANTIZE_SUPPORTED |
| /* Turn on quantizing, and reduce the palette to the number of colors |
| * available. |
| */ |
| PNG_EXPORT(49, void, png_set_quantize, (png_structrp png_ptr, png_colorp palette, |
| int num_palette, int maximum_colors, png_const_uint_16p histogram, |
| int full_quantize)); |
| #endif |
| |
| #ifdef PNG_READ_GAMMA_SUPPORTED |
| /* The threshold on gamma processing is configurable but hard-wired into the |
| * library. The following is the floating point variant. |
| */ |
| #define PNG_GAMMA_THRESHOLD (PNG_GAMMA_THRESHOLD_FIXED*.00001) |
| |
| /* Handle gamma correction. Screen_gamma=(display_exponent). |
| * NOTE: this API simply sets the screen and file gamma values. It will |
| * therefore override the value for gamma in a PNG file if it is called after |
| * the file header has been read - use with care - call before reading the PNG |
| * file for best results! |
| * |
| * These routines accept the same gamma values as png_set_alpha_mode (described |
| * above). The PNG_GAMMA_ defines and PNG_DEFAULT_sRGB can be passed to either |
| * API (floating point or fixed.) Notice, however, that the 'file_gamma' value |
| * is the inverse of a 'screen gamma' value. |
| */ |
| PNG_FP_EXPORT(50, void, png_set_gamma, (png_structrp png_ptr, |
| double screen_gamma, double override_file_gamma)); |
| PNG_FIXED_EXPORT(208, void, png_set_gamma_fixed, (png_structrp png_ptr, |
| png_fixed_point screen_gamma, png_fixed_point override_file_gamma)); |
| #endif |
| |
| #ifdef PNG_WRITE_FLUSH_SUPPORTED |
| /* Set how many lines between output flushes - 0 for no flushing */ |
| PNG_EXPORT(51, void, png_set_flush, (png_structrp png_ptr, int nrows)); |
| /* Flush the current PNG output buffer */ |
| PNG_EXPORT(52, void, png_write_flush, (png_structrp png_ptr)); |
| #endif |
| |
| /* Optional update palette with requested transformations */ |
| PNG_EXPORT(53, void, png_start_read_image, (png_structrp png_ptr)); |
| |
| /* Optional call to update the users info structure */ |
| PNG_EXPORT(54, void, png_read_update_info, (png_structrp png_ptr, |
| png_inforp info_ptr)); |
| |
| #ifdef PNG_SEQUENTIAL_READ_SUPPORTED |
| /* Read one or more rows of image data. */ |
| PNG_EXPORT(55, void, png_read_rows, (png_structrp png_ptr, png_bytepp row, |
| png_bytepp display_row, png_uint_32 num_rows)); |
| #endif |
| |
| #ifdef PNG_SEQUENTIAL_READ_SUPPORTED |
| /* Read a row of data. */ |
| PNG_EXPORT(56, void, png_read_row, (png_structrp png_ptr, png_bytep row, |
| png_bytep display_row)); |
| #endif |
| |
| #ifdef PNG_SEQUENTIAL_READ_SUPPORTED |
| /* Read the whole image into memory at once. */ |
| PNG_EXPORT(57, void, png_read_image, (png_structrp png_ptr, png_bytepp image)); |
| #endif |
| |
| /* Write a row of image data */ |
| PNG_EXPORT(58, void, png_write_row, (png_structrp png_ptr, png_const_bytep row)); |
| |
| /* Write a few rows of image data: (*row) is not written; however, the type |
| * is declared as writeable to maintain compatibility with previous versions |
| * of libpng and to allow the 'display_row' array from read_rows to be passed |
| * unchanged to write_rows. |
| */ |
| PNG_EXPORT(59, void, png_write_rows, (png_structrp png_ptr, png_bytepp row, |
| png_uint_32 num_rows)); |
| |
| /* Write the image data */ |
| PNG_EXPORT(60, void, png_write_image, (png_structrp png_ptr, png_bytepp image)); |
| |
| /* Write the end of the PNG file. */ |
| PNG_EXPORT(61, void, png_write_end, (png_structrp png_ptr, png_inforp info_ptr)); |
| |
| #ifdef PNG_SEQUENTIAL_READ_SUPPORTED |
| /* Read the end of the PNG file. */ |
| PNG_EXPORT(62, void, png_read_end, (png_structrp png_ptr, png_inforp info_ptr)); |
| #endif |
| |
| /* Free any memory associated with the png_info_struct */ |
| PNG_EXPORT(63, void, png_destroy_info_struct, (png_const_structrp png_ptr, |
| png_infopp info_ptr_ptr)); |
| |
| /* Free any memory associated with the png_struct and the png_info_structs */ |
| PNG_EXPORT(64, void, png_destroy_read_struct, (png_structpp png_ptr_ptr, |
| png_infopp info_ptr_ptr, png_infopp end_info_ptr_ptr)); |
| |
| /* Free any memory associated with the png_struct and the png_info_structs */ |
| PNG_EXPORT(65, void, png_destroy_write_struct, (png_structpp png_ptr_ptr, |
| png_infopp info_ptr_ptr)); |
| |
| /* Set the libpng method of handling chunk CRC errors */ |
| PNG_EXPORT(66, void, png_set_crc_action, (png_structrp png_ptr, int crit_action, |
| int ancil_action)); |
| |
| /* Values for png_set_crc_action() say how to handle CRC errors in |
| * ancillary and critical chunks, and whether to use the data contained |
| * therein. Note that it is impossible to "discard" data in a critical |
| * chunk. For versions prior to 0.90, the action was always error/quit, |
| * whereas in version 0.90 and later, the action for CRC errors in ancillary |
| * chunks is warn/discard. These values should NOT be changed. |
| * |
| * value action:critical action:ancillary |
| */ |
| #define PNG_CRC_DEFAULT 0 /* error/quit warn/discard data */ |
| #define PNG_CRC_ERROR_QUIT 1 /* error/quit error/quit */ |
| #define PNG_CRC_WARN_DISCARD 2 /* (INVALID) warn/discard data */ |
| #define PNG_CRC_WARN_USE 3 /* warn/use data warn/use data */ |
| #define PNG_CRC_QUIET_USE 4 /* quiet/use data quiet/use data */ |
| #define PNG_CRC_NO_CHANGE 5 /* use current value use current value */ |
| |
| /* These functions give the user control over the scan-line filtering in |
| * libpng and the compression methods used by zlib. These functions are |
| * mainly useful for testing, as the defaults should work with most users. |
| * Those users who are tight on memory or want faster performance at the |
| * expense of compression can modify them. See the compression library |
| * header file (zlib.h) for an explination of the compression functions. |
| */ |
| |
| /* Set the filtering method(s) used by libpng. Currently, the only valid |
| * value for "method" is 0. |
| */ |
| PNG_EXPORT(67, void, png_set_filter, (png_structrp png_ptr, int method, |
| int filters)); |
| |
| /* Flags for png_set_filter() to say which filters to use. The flags |
| * are chosen so that they don't conflict with real filter types |
| * below, in case they are supplied instead of the #defined constants. |
| * These values should NOT be changed. |
| */ |
| #define PNG_NO_FILTERS 0x00 |
| #define PNG_FILTER_NONE 0x08 |
| #define PNG_FILTER_SUB 0x10 |
| #define PNG_FILTER_UP 0x20 |
| #define PNG_FILTER_AVG 0x40 |
| #define PNG_FILTER_PAETH 0x80 |
| #define PNG_ALL_FILTERS (PNG_FILTER_NONE | PNG_FILTER_SUB | PNG_FILTER_UP | \ |
| PNG_FILTER_AVG | PNG_FILTER_PAETH) |
| |
| /* Filter values (not flags) - used in pngwrite.c, pngwutil.c for now. |
| * These defines should NOT be changed. |
| */ |
| #define PNG_FILTER_VALUE_NONE 0 |
| #define PNG_FILTER_VALUE_SUB 1 |
| #define PNG_FILTER_VALUE_UP 2 |
| #define PNG_FILTER_VALUE_AVG 3 |
| #define PNG_FILTER_VALUE_PAETH 4 |
| #define PNG_FILTER_VALUE_LAST 5 |
| |
| #ifdef PNG_WRITE_WEIGHTED_FILTER_SUPPORTED /* EXPERIMENTAL */ |
| /* The "heuristic_method" is given by one of the PNG_FILTER_HEURISTIC_ |
| * defines, either the default (minimum-sum-of-absolute-differences), or |
| * the experimental method (weighted-minimum-sum-of-absolute-differences). |
| * |
| * Weights are factors >= 1.0, indicating how important it is to keep the |
| * filter type consistent between rows. Larger numbers mean the current |
| * filter is that many times as likely to be the same as the "num_weights" |
| * previous filters. This is cumulative for each previous row with a weight. |
| * There needs to be "num_weights" values in "filter_weights", or it can be |
| * NULL if the weights aren't being specified. Weights have no influence on |
| * the selection of the first row filter. Well chosen weights can (in theory) |
| * improve the compression for a given image. |
| * |
| * Costs are factors >= 1.0 indicating the relative decoding costs of a |
| * filter type. Higher costs indicate more decoding expense, and are |
| * therefore less likely to be selected over a filter with lower computational |
| * costs. There needs to be a value in "filter_costs" for each valid filter |
| * type (given by PNG_FILTER_VALUE_LAST), or it can be NULL if you aren't |
| * setting the costs. Costs try to improve the speed of decompression without |
| * unduly increasing the compressed image size. |
| * |
| * A negative weight or cost indicates the default value is to be used, and |
| * values in the range [0.0, 1.0) indicate the value is to remain unchanged. |
| * The default values for both weights and costs are currently 1.0, but may |
| * change if good general weighting/cost heuristics can be found. If both |
| * the weights and costs are set to 1.0, this degenerates the WEIGHTED method |
| * to the UNWEIGHTED method, but with added encoding time/computation. |
| */ |
| PNG_FP_EXPORT(68, void, png_set_filter_heuristics, (png_structrp png_ptr, |
| int heuristic_method, int num_weights, png_const_doublep filter_weights, |
| png_const_doublep filter_costs)); |
| PNG_FIXED_EXPORT(209, void, png_set_filter_heuristics_fixed, |
| (png_structrp png_ptr, int heuristic_method, int num_weights, |
| png_const_fixed_point_p filter_weights, |
| png_const_fixed_point_p filter_costs)); |
| #endif /* PNG_WRITE_WEIGHTED_FILTER_SUPPORTED */ |
| |
| /* Heuristic used for row filter selection. These defines should NOT be |
| * changed. |
| */ |
| #define PNG_FILTER_HEURISTIC_DEFAULT 0 /* Currently "UNWEIGHTED" */ |
| #define PNG_FILTER_HEURISTIC_UNWEIGHTED 1 /* Used by libpng < 0.95 */ |
| #define PNG_FILTER_HEURISTIC_WEIGHTED 2 /* Experimental feature */ |
| #define PNG_FILTER_HEURISTIC_LAST 3 /* Not a valid value */ |
| |
| #ifdef PNG_WRITE_SUPPORTED |
| /* Set the library compression level. Currently, valid values range from |
| * 0 - 9, corresponding directly to the zlib compression levels 0 - 9 |
| * (0 - no compression, 9 - "maximal" compression). Note that tests have |
| * shown that zlib compression levels 3-6 usually perform as well as level 9 |
| * for PNG images, and do considerably fewer caclulations. In the future, |
| * these values may not correspond directly to the zlib compression levels. |
| */ |
| PNG_EXPORT(69, void, png_set_compression_level, (png_structrp png_ptr, |
| int level)); |
| |
| PNG_EXPORT(70, void, png_set_compression_mem_level, (png_structrp png_ptr, |
| int mem_level)); |
| |
| PNG_EXPORT(71, void, png_set_compression_strategy, (png_structrp png_ptr, |
| int strategy)); |
| |
| /* If PNG_WRITE_OPTIMIZE_CMF_SUPPORTED is defined, libpng will use a |
| * smaller value of window_bits if it can do so safely. |
| */ |
| PNG_EXPORT(72, void, png_set_compression_window_bits, (png_structrp png_ptr, |
| int window_bits)); |
| |
| PNG_EXPORT(73, void, png_set_compression_method, (png_structrp png_ptr, |
| int method)); |
| #endif |
| |
| #ifdef PNG_WRITE_CUSTOMIZE_ZTXT_COMPRESSION_SUPPORTED |
| /* Also set zlib parameters for compressing non-IDAT chunks */ |
| PNG_EXPORT(222, void, png_set_text_compression_level, (png_structrp png_ptr, |
| int level)); |
| |
| PNG_EXPORT(223, void, png_set_text_compression_mem_level, (png_structrp png_ptr, |
| int mem_level)); |
| |
| PNG_EXPORT(224, void, png_set_text_compression_strategy, (png_structrp png_ptr, |
| int strategy)); |
| |
| /* If PNG_WRITE_OPTIMIZE_CMF_SUPPORTED is defined, libpng will use a |
| * smaller value of window_bits if it can do so safely. |
| */ |
| PNG_EXPORT(225, void, png_set_text_compression_window_bits, |
| (png_structrp png_ptr, int window_bits)); |
| |
| PNG_EXPORT(226, void, png_set_text_compression_method, (png_structrp png_ptr, |
| int method)); |
| #endif /* PNG_WRITE_CUSTOMIZE_ZTXT_COMPRESSION_SUPPORTED */ |
| |
| /* These next functions are called for input/output, memory, and error |
| * handling. They are in the file pngrio.c, pngwio.c, and pngerror.c, |
| * and call standard C I/O routines such as fread(), fwrite(), and |
| * fprintf(). These functions can be made to use other I/O routines |
| * at run time for those applications that need to handle I/O in a |
| * different manner by calling png_set_???_fn(). See libpng-manual.txt for |
| * more information. |
| */ |
| |
| #ifdef PNG_STDIO_SUPPORTED |
| /* Initialize the input/output for the PNG file to the default functions. */ |
| PNG_EXPORT(74, void, png_init_io, (png_structrp png_ptr, png_FILE_p fp)); |
| #endif |
| |
| /* Replace the (error and abort), and warning functions with user |
| * supplied functions. If no messages are to be printed you must still |
| * write and use replacement functions. The replacement error_fn should |
| * still do a longjmp to the last setjmp location if you are using this |
| * method of error handling. If error_fn or warning_fn is NULL, the |
| * default function will be used. |
| */ |
| |
| PNG_EXPORT(75, void, png_set_error_fn, (png_structrp png_ptr, |
| png_voidp error_ptr, png_error_ptr error_fn, png_error_ptr warning_fn)); |
| |
| /* Return the user pointer associated with the error functions */ |
| PNG_EXPORT(76, png_voidp, png_get_error_ptr, (png_const_structrp png_ptr)); |
| |
| /* Replace the default data output functions with a user supplied one(s). |
| * If buffered output is not used, then output_flush_fn can be set to NULL. |
| * If PNG_WRITE_FLUSH_SUPPORTED is not defined at libpng compile time |
| * output_flush_fn will be ignored (and thus can be NULL). |
| * It is probably a mistake to use NULL for output_flush_fn if |
| * write_data_fn is not also NULL unless you have built libpng with |
| * PNG_WRITE_FLUSH_SUPPORTED undefined, because in this case libpng's |
| * default flush function, which uses the standard *FILE structure, will |
| * be used. |
| */ |
| PNG_EXPORT(77, void, png_set_write_fn, (png_structrp png_ptr, png_voidp io_ptr, |
| png_rw_ptr write_data_fn, png_flush_ptr output_flush_fn)); |
| |
| /* Replace the default data input function with a user supplied one. */ |
| PNG_EXPORT(78, void, png_set_read_fn, (png_structrp png_ptr, png_voidp io_ptr, |
| png_rw_ptr read_data_fn)); |
| |
| /* Return the user pointer associated with the I/O functions */ |
| PNG_EXPORT(79, png_voidp, png_get_io_ptr, (png_const_structrp png_ptr)); |
| |
| PNG_EXPORT(80, void, png_set_read_status_fn, (png_structrp png_ptr, |
| png_read_status_ptr read_row_fn)); |
| |
| PNG_EXPORT(81, void, png_set_write_status_fn, (png_structrp png_ptr, |
| png_write_status_ptr write_row_fn)); |
| |
| #ifdef PNG_USER_MEM_SUPPORTED |
| /* Replace the default memory allocation functions with user supplied one(s). */ |
| PNG_EXPORT(82, void, png_set_mem_fn, (png_structrp png_ptr, png_voidp mem_ptr, |
| png_malloc_ptr malloc_fn, png_free_ptr free_fn)); |
| /* Return the user pointer associated with the memory functions */ |
| PNG_EXPORT(83, png_voidp, png_get_mem_ptr, (png_const_structrp png_ptr)); |
| #endif |
| |
| #ifdef PNG_READ_USER_TRANSFORM_SUPPORTED |
| PNG_EXPORT(84, void, png_set_read_user_transform_fn, (png_structrp png_ptr, |
| png_user_transform_ptr read_user_transform_fn)); |
| #endif |
| |
| #ifdef PNG_WRITE_USER_TRANSFORM_SUPPORTED |
| PNG_EXPORT(85, void, png_set_write_user_transform_fn, (png_structrp png_ptr, |
| png_user_transform_ptr write_user_transform_fn)); |
| #endif |
| |
| #ifdef PNG_USER_TRANSFORM_PTR_SUPPORTED |
| PNG_EXPORT(86, void, png_set_user_transform_info, (png_structrp png_ptr, |
| png_voidp user_transform_ptr, int user_transform_depth, |
| int user_transform_channels)); |
| /* Return the user pointer associated with the user transform functions */ |
| PNG_EXPORT(87, png_voidp, png_get_user_transform_ptr, |
| (png_const_structrp png_ptr)); |
| #endif |
| |
| #ifdef PNG_USER_TRANSFORM_INFO_SUPPORTED |
| /* Return information about the row currently being processed. Note that these |
| * APIs do not fail but will return unexpected results if called outside a user |
| * transform callback. Also note that when transforming an interlaced image the |
| * row number is the row number within the sub-image of the interlace pass, so |
| * the value will increase to the height of the sub-image (not the full image) |
| * then reset to 0 for the next pass. |
| * |
| * Use PNG_ROW_FROM_PASS_ROW(row, pass) and PNG_COL_FROM_PASS_COL(col, pass) to |
| * find the output pixel (x,y) given an interlaced sub-image pixel |
| * (row,col,pass). (See below for these macros.) |
| */ |
| PNG_EXPORT(217, png_uint_32, png_get_current_row_number, (png_const_structrp)); |
| PNG_EXPORT(218, png_byte, png_get_current_pass_number, (png_const_structrp)); |
| #endif |
| |
| #ifdef PNG_USER_CHUNKS_SUPPORTED |
| PNG_EXPORT(88, void, png_set_read_user_chunk_fn, (png_structrp png_ptr, |
| png_voidp user_chunk_ptr, png_user_chunk_ptr read_user_chunk_fn)); |
| PNG_EXPORT(89, png_voidp, png_get_user_chunk_ptr, (png_const_structrp png_ptr)); |
| #endif |
| |
| #ifdef PNG_PROGRESSIVE_READ_SUPPORTED |
| /* Sets the function callbacks for the push reader, and a pointer to a |
| * user-defined structure available to the callback functions. |
| */ |
| PNG_EXPORT(90, void, png_set_progressive_read_fn, (png_structrp png_ptr, |
| png_voidp progressive_ptr, png_progressive_info_ptr info_fn, |
| png_progressive_row_ptr row_fn, png_progressive_end_ptr end_fn)); |
| |
| /* Returns the user pointer associated with the push read functions */ |
| PNG_EXPORT(91, png_voidp, png_get_progressive_ptr, (png_const_structrp png_ptr)); |
| |
| /* Function to be called when data becomes available */ |
| PNG_EXPORT(92, void, png_process_data, (png_structrp png_ptr, png_inforp info_ptr, |
| png_bytep buffer, png_size_t buffer_size)); |
| |
| /* A function which may be called *only* within png_process_data to stop the |
| * processing of any more data. The function returns the number of bytes |
| * remaining, excluding any that libpng has cached internally. A subsequent |
| * call to png_process_data must supply these bytes again. If the argument |
| * 'save' is set to true the routine will first save all the pending data and |
| * will always return 0. |
| */ |
| PNG_EXPORT(219, png_size_t, png_process_data_pause, (png_structrp, int save)); |
| |
| /* A function which may be called *only* outside (after) a call to |
| * png_process_data. It returns the number of bytes of data to skip in the |
| * input. Normally it will return 0, but if it returns a non-zero value the |
| * application must skip than number of bytes of input data and pass the |
| * following data to the next call to png_process_data. |
| */ |
| PNG_EXPORT(220, png_uint_32, png_process_data_skip, (png_structrp)); |
| |
| #ifdef PNG_READ_INTERLACING_SUPPORTED |
| /* Function that combines rows. 'new_row' is a flag that should come from |
| * the callback and be non-NULL if anything needs to be done; the library |
| * stores its own version of the new data internally and ignores the passed |
| * in value. |
| */ |
| PNG_EXPORT(93, void, png_progressive_combine_row, (png_const_structrp png_ptr, |
| png_bytep old_row, png_const_bytep new_row)); |
| #endif /* PNG_READ_INTERLACING_SUPPORTED */ |
| #endif /* PNG_PROGRESSIVE_READ_SUPPORTED */ |
| |
| PNG_EXPORTA(94, png_voidp, png_malloc, (png_const_structrp png_ptr, |
| png_alloc_size_t size), PNG_ALLOCATED); |
| /* Added at libpng version 1.4.0 */ |
| PNG_EXPORTA(95, png_voidp, png_calloc, (png_const_structrp png_ptr, |
| png_alloc_size_t size), PNG_ALLOCATED); |
| |
| /* Added at libpng version 1.2.4 */ |
| PNG_EXPORTA(96, png_voidp, png_malloc_warn, (png_const_structrp png_ptr, |
| png_alloc_size_t size), PNG_ALLOCATED); |
| |
| /* Frees a pointer allocated by png_malloc() */ |
| PNG_EXPORT(97, void, png_free, (png_const_structrp png_ptr, png_voidp ptr)); |
| |
| /* Free data that was allocated internally */ |
| PNG_EXPORT(98, void, png_free_data, (png_const_structrp png_ptr, |
| png_inforp info_ptr, png_uint_32 free_me, int num)); |
| |
| /* Reassign responsibility for freeing existing data, whether allocated |
| * by libpng or by the application; this works on the png_info structure passed |
| * in, it does not change the state for other png_info structures. |
| */ |
| PNG_EXPORT(99, void, png_data_freer, (png_const_structrp png_ptr, |
| png_inforp info_ptr, int freer, png_uint_32 mask)); |
| |
| /* Assignments for png_data_freer */ |
| #define PNG_DESTROY_WILL_FREE_DATA 1 |
| #define PNG_SET_WILL_FREE_DATA 1 |
| #define PNG_USER_WILL_FREE_DATA 2 |
| /* Flags for png_ptr->free_me and info_ptr->free_me */ |
| #define PNG_FREE_HIST 0x0008 |
| #define PNG_FREE_ICCP 0x0010 |
| #define PNG_FREE_SPLT 0x0020 |
| #define PNG_FREE_ROWS 0x0040 |
| #define PNG_FREE_PCAL 0x0080 |
| #define PNG_FREE_SCAL 0x0100 |
| #define PNG_FREE_UNKN 0x0200 |
| #define PNG_FREE_LIST 0x0400 |
| #define PNG_FREE_PLTE 0x1000 |
| #define PNG_FREE_TRNS 0x2000 |
| #define PNG_FREE_TEXT 0x4000 |
| #define PNG_FREE_ALL 0x7fff |
| #define PNG_FREE_MUL 0x4220 /* PNG_FREE_SPLT|PNG_FREE_TEXT|PNG_FREE_UNKN */ |
| |
| #ifdef PNG_USER_MEM_SUPPORTED |
| PNG_EXPORTA(100, png_voidp, png_malloc_default, (png_const_structrp png_ptr, |
| png_alloc_size_t size), PNG_ALLOCATED PNG_DEPRECATED); |
| PNG_EXPORTA(101, void, png_free_default, (png_const_structrp png_ptr, |
| png_voidp ptr), PNG_DEPRECATED); |
| #endif |
| |
| #ifdef PNG_ERROR_TEXT_SUPPORTED |
| /* Fatal error in PNG image of libpng - can't continue */ |
| PNG_EXPORTA(102, void, png_error, (png_const_structrp png_ptr, |
| png_const_charp error_message), PNG_NORETURN); |
| |
| /* The same, but the chunk name is prepended to the error string. */ |
| PNG_EXPORTA(103, void, png_chunk_error, (png_const_structrp png_ptr, |
| png_const_charp error_message), PNG_NORETURN); |
| |
| #else |
| /* Fatal error in PNG image of libpng - can't continue */ |
| PNG_EXPORTA(104, void, png_err, (png_const_structrp png_ptr), PNG_NORETURN); |
| #endif |
| |
| #ifdef PNG_WARNINGS_SUPPORTED |
| /* Non-fatal error in libpng. Can continue, but may have a problem. */ |
| PNG_EXPORT(105, void, png_warning, (png_const_structrp png_ptr, |
| png_const_charp warning_message)); |
| |
| /* Non-fatal error in libpng, chunk name is prepended to message. */ |
| PNG_EXPORT(106, void, png_chunk_warning, (png_const_structrp png_ptr, |
| png_const_charp warning_message)); |
| #endif |
| |
| #ifdef PNG_BENIGN_ERRORS_SUPPORTED |
| /* Benign error in libpng. Can continue, but may have a problem. |
| * User can choose whether to handle as a fatal error or as a warning. */ |
| # undef png_benign_error |
| PNG_EXPORT(107, void, png_benign_error, (png_const_structrp png_ptr, |
| png_const_charp warning_message)); |
| |
| /* Same, chunk name is prepended to message. */ |
| # undef png_chunk_benign_error |
| PNG_EXPORT(108, void, png_chunk_benign_error, (png_const_structrp png_ptr, |
| png_const_charp warning_message)); |
| |
| PNG_EXPORT(109, void, png_set_benign_errors, |
| (png_structrp png_ptr, int allowed)); |
| #else |
| # ifdef PNG_ALLOW_BENIGN_ERRORS |
| # define png_benign_error png_warning |
| # define png_chunk_benign_error png_chunk_warning |
| # else |
| # define png_benign_error png_error |
| # define png_chunk_benign_error png_chunk_error |
| # endif |
| #endif |
| |
| /* The png_set_<chunk> functions are for storing values in the png_info_struct. |
| * Similarly, the png_get_<chunk> calls are used to read values from the |
| * png_info_struct, either storing the parameters in the passed variables, or |
| * setting pointers into the png_info_struct where the data is stored. The |
| * png_get_<chunk> functions return a non-zero value if the data was available |
| * in info_ptr, or return zero and do not change any of the parameters if the |
| * data was not available. |
| * |
| * These functions should be used instead of directly accessing png_info |
| * to avoid problems with future changes in the size and internal layout of |
| * png_info_struct. |
| */ |
| /* Returns "flag" if chunk data is valid in info_ptr. */ |
| PNG_EXPORT(110, png_uint_32, png_get_valid, (png_const_structrp png_ptr, |
| png_const_inforp info_ptr, png_uint_32 flag)); |
| |
| /* Returns number of bytes needed to hold a transformed row. */ |
| PNG_EXPORT(111, png_size_t, png_get_rowbytes, (png_const_structrp png_ptr, |
| png_const_inforp info_ptr)); |
| |
| #ifdef PNG_INFO_IMAGE_SUPPORTED |
| /* Returns row_pointers, which is an array of pointers to scanlines that was |
| * returned from png_read_png(). |
| */ |
| PNG_EXPORT(112, png_bytepp, png_get_rows, (png_const_structrp png_ptr, |
| png_const_inforp info_ptr)); |
| |
| /* Set row_pointers, which is an array of pointers to scanlines for use |
| * by png_write_png(). |
| */ |
| PNG_EXPORT(113, void, png_set_rows, (png_const_structrp png_ptr, |
| png_inforp info_ptr, png_bytepp row_pointers)); |
| #endif |
| |
| /* Returns number of color channels in image. */ |
| PNG_EXPORT(114, png_byte, png_get_channels, (png_const_structrp png_ptr, |
| png_const_inforp info_ptr)); |
| |
| #ifdef PNG_EASY_ACCESS_SUPPORTED |
| /* Returns image width in pixels. */ |
| PNG_EXPORT(115, png_uint_32, png_get_image_width, (png_const_structrp png_ptr, |
| png_const_inforp info_ptr)); |
| |
| /* Returns image height in pixels. */ |
| PNG_EXPORT(116, png_uint_32, png_get_image_height, (png_const_structrp png_ptr, |
| png_const_inforp info_ptr)); |
| |
| /* Returns image bit_depth. */ |
| PNG_EXPORT(117, png_byte, png_get_bit_depth, (png_const_structrp png_ptr, |
| png_const_inforp info_ptr)); |
| |
| /* Returns image color_type. */ |
| PNG_EXPORT(118, png_byte, png_get_color_type, (png_const_structrp png_ptr, |
| png_const_inforp info_ptr)); |
| |
| /* Returns image filter_type. */ |
| PNG_EXPORT(119, png_byte, png_get_filter_type, (png_const_structrp png_ptr, |
| png_const_inforp info_ptr)); |
| |
| /* Returns image interlace_type. */ |
| PNG_EXPORT(120, png_byte, png_get_interlace_type, (png_const_structrp png_ptr, |
| png_const_inforp info_ptr)); |
| |
| /* Returns image compression_type. */ |
| PNG_EXPORT(121, png_byte, png_get_compression_type, (png_const_structrp png_ptr, |
| png_const_inforp info_ptr)); |
| |
| /* Returns image resolution in pixels per meter, from pHYs chunk data. */ |
| PNG_EXPORT(122, png_uint_32, png_get_pixels_per_meter, |
| (png_const_structrp png_ptr, png_const_inforp info_ptr)); |
| PNG_EXPORT(123, png_uint_32, png_get_x_pixels_per_meter, |
| (png_const_structrp png_ptr, png_const_inforp info_ptr)); |
| PNG_EXPORT(124, png_uint_32, png_get_y_pixels_per_meter, |
| (png_const_structrp png_ptr, png_const_inforp info_ptr)); |
| |
| /* Returns pixel aspect ratio, computed from pHYs chunk data. */ |
| PNG_FP_EXPORT(125, float, png_get_pixel_aspect_ratio, |
| (png_const_structrp png_ptr, png_const_inforp info_ptr)); |
| PNG_FIXED_EXPORT(210, png_fixed_point, png_get_pixel_aspect_ratio_fixed, |
| (png_const_structrp png_ptr, png_const_inforp info_ptr)); |
| |
| /* Returns image x, y offset in pixels or microns, from oFFs chunk data. */ |
| PNG_EXPORT(126, png_int_32, png_get_x_offset_pixels, (png_const_structrp png_ptr, |
| png_const_inforp info_ptr)); |
| PNG_EXPORT(127, png_int_32, png_get_y_offset_pixels, (png_const_structrp png_ptr, |
| png_const_inforp info_ptr)); |
| PNG_EXPORT(128, png_int_32, png_get_x_offset_microns, |
| (png_const_structrp png_ptr, png_const_inforp info_ptr)); |
| PNG_EXPORT(129, png_int_32, png_get_y_offset_microns, |
| (png_const_structrp png_ptr, png_const_inforp info_ptr)); |
| |
| #endif /* PNG_EASY_ACCESS_SUPPORTED */ |
| |
| /* Returns pointer to signature string read from PNG header */ |
| PNG_EXPORT(130, png_const_bytep, png_get_signature, (png_const_structrp png_ptr, |
| png_const_inforp info_ptr)); |
| |
| #ifdef PNG_bKGD_SUPPORTED |
| PNG_EXPORT(131, png_uint_32, png_get_bKGD, (png_const_structrp png_ptr, |
| png_inforp info_ptr, png_color_16p *background)); |
| #endif |
| |
| #ifdef PNG_bKGD_SUPPORTED |
| PNG_EXPORT(132, void, png_set_bKGD, (png_const_structrp png_ptr, |
| png_inforp info_ptr, png_const_color_16p background)); |
| #endif |
| |
| #ifdef PNG_cHRM_SUPPORTED |
| PNG_FP_EXPORT(133, png_uint_32, png_get_cHRM, (png_const_structrp png_ptr, |
| png_const_inforp info_ptr, double *white_x, double *white_y, double *red_x, |
| double *red_y, double *green_x, double *green_y, double *blue_x, |
| double *blue_y)); |
| PNG_FP_EXPORT(230, png_uint_32, png_get_cHRM_XYZ, (png_const_structrp png_ptr, |
| png_const_inforp info_ptr, double *red_X, double *red_Y, double *red_Z, |
| double *green_X, double *green_Y, double *green_Z, double *blue_X, |
| double *blue_Y, double *blue_Z)); |
| #ifdef PNG_FIXED_POINT_SUPPORTED /* Otherwise not implemented */ |
| PNG_FIXED_EXPORT(134, png_uint_32, png_get_cHRM_fixed, |
| (png_const_structrp png_ptr, png_const_inforp info_ptr, |
| png_fixed_point *int_white_x, png_fixed_point *int_white_y, |
| png_fixed_point *int_red_x, png_fixed_point *int_red_y, |
| png_fixed_point *int_green_x, png_fixed_point *int_green_y, |
| png_fixed_point *int_blue_x, png_fixed_point *int_blue_y)); |
| #endif |
| PNG_FIXED_EXPORT(231, png_uint_32, png_get_cHRM_XYZ_fixed, |
| (png_const_structrp png_ptr, png_const_inforp info_ptr, |
| png_fixed_point *int_red_X, png_fixed_point *int_red_Y, |
| png_fixed_point *int_red_Z, png_fixed_point *int_green_X, |
| png_fixed_point *int_green_Y, png_fixed_point *int_green_Z, |
| png_fixed_point *int_blue_X, png_fixed_point *int_blue_Y, |
| png_fixed_point *int_blue_Z)); |
| #endif |
| |
| #ifdef PNG_cHRM_SUPPORTED |
| PNG_FP_EXPORT(135, void, png_set_cHRM, (png_const_structrp png_ptr, |
| png_inforp info_ptr, |
| double white_x, double white_y, double red_x, double red_y, double green_x, |
| double green_y, double blue_x, double blue_y)); |
| PNG_FP_EXPORT(232, void, png_set_cHRM_XYZ, (png_const_structrp png_ptr, |
| png_inforp info_ptr, double red_X, double red_Y, double red_Z, |
| double green_X, double green_Y, double green_Z, double blue_X, |
| double blue_Y, double blue_Z)); |
| PNG_FIXED_EXPORT(136, void, png_set_cHRM_fixed, (png_const_structrp png_ptr, |
| png_inforp info_ptr, png_fixed_point int_white_x, |
| png_fixed_point int_white_y, png_fixed_point int_red_x, |
| png_fixed_point int_red_y, png_fixed_point int_green_x, |
| png_fixed_point int_green_y, png_fixed_point int_blue_x, |
| png_fixed_point int_blue_y)); |
| PNG_FIXED_EXPORT(233, void, png_set_cHRM_XYZ_fixed, (png_const_structrp png_ptr, |
| png_inforp info_ptr, png_fixed_point int_red_X, png_fixed_point int_red_Y, |
| png_fixed_point int_red_Z, png_fixed_point int_green_X, |
| png_fixed_point int_green_Y, png_fixed_point int_green_Z, |
| png_fixed_point int_blue_X, png_fixed_point int_blue_Y, |
| png_fixed_point int_blue_Z)); |
| #endif |
| |
| #ifdef PNG_gAMA_SUPPORTED |
| PNG_FP_EXPORT(137, png_uint_32, png_get_gAMA, (png_const_structrp png_ptr, |
| png_const_inforp info_ptr, double *file_gamma)); |
| PNG_FIXED_EXPORT(138, png_uint_32, png_get_gAMA_fixed, |
| (png_const_structrp png_ptr, png_const_inforp info_ptr, |
| png_fixed_point *int_file_gamma)); |
| #endif |
| |
| #ifdef PNG_gAMA_SUPPORTED |
| PNG_FP_EXPORT(139, void, png_set_gAMA, (png_const_structrp png_ptr, |
| png_inforp info_ptr, double file_gamma)); |
| PNG_FIXED_EXPORT(140, void, png_set_gAMA_fixed, (png_const_structrp png_ptr, |
| png_inforp info_ptr, png_fixed_point int_file_gamma)); |
| #endif |
| |
| #ifdef PNG_hIST_SUPPORTED |
| PNG_EXPORT(141, png_uint_32, png_get_hIST, (png_const_structrp png_ptr, |
| png_const_inforp info_ptr, png_uint_16p *hist)); |
| #endif |
| |
| #ifdef PNG_hIST_SUPPORTED |
| PNG_EXPORT(142, void, png_set_hIST, (png_const_structrp png_ptr, |
| png_inforp info_ptr, png_const_uint_16p hist)); |
| #endif |
| |
| PNG_EXPORT(143, png_uint_32, png_get_IHDR, (png_const_structrp png_ptr, |
| png_const_inforp info_ptr, png_uint_32 *width, png_uint_32 *height, |
| int *bit_depth, int *color_type, int *interlace_method, |
| int *compression_method, int *filter_method)); |
| |
| PNG_EXPORT(144, void, png_set_IHDR, (png_const_structrp png_ptr, |
| png_inforp info_ptr, png_uint_32 width, png_uint_32 height, int bit_depth, |
| int color_type, int interlace_method, int compression_method, |
| int filter_method)); |
| |
| #ifdef PNG_oFFs_SUPPORTED |
| PNG_EXPORT(145, png_uint_32, png_get_oFFs, (png_const_structrp png_ptr, |
| png_const_inforp info_ptr, png_int_32 *offset_x, png_int_32 *offset_y, |
| int *unit_type)); |
| #endif |
| |
| #ifdef PNG_oFFs_SUPPORTED |
| PNG_EXPORT(146, void, png_set_oFFs, (png_const_structrp png_ptr, |
| png_inforp info_ptr, png_int_32 offset_x, png_int_32 offset_y, |
| int unit_type)); |
| #endif |
| |
| #ifdef PNG_pCAL_SUPPORTED |
| PNG_EXPORT(147, png_uint_32, png_get_pCAL, (png_const_structrp png_ptr, |
| png_const_inforp info_ptr, png_charp *purpose, png_int_32 *X0, |
| png_int_32 *X1, int *type, int *nparams, png_charp *units, |
| png_charpp *params)); |
| #endif |
| |
| #ifdef PNG_pCAL_SUPPORTED |
| PNG_EXPORT(148, void, png_set_pCAL, (png_const_structrp png_ptr, |
| png_inforp info_ptr, png_const_charp purpose, png_int_32 X0, png_int_32 X1, |
| int type, int nparams, png_const_charp units, png_charpp params)); |
| #endif |
| |
| #ifdef PNG_pHYs_SUPPORTED |
| PNG_EXPORT(149, png_uint_32, png_get_pHYs, (png_const_structrp png_ptr, |
| png_const_inforp info_ptr, png_uint_32 *res_x, png_uint_32 *res_y, |
| int *unit_type)); |
| #endif |
| |
| #ifdef PNG_pHYs_SUPPORTED |
| PNG_EXPORT(150, void, png_set_pHYs, (png_const_structrp png_ptr, |
| png_inforp info_ptr, png_uint_32 res_x, png_uint_32 res_y, int unit_type)); |
| #endif |
| |
| PNG_EXPORT(151, png_uint_32, png_get_PLTE, (png_const_structrp png_ptr, |
| png_const_inforp info_ptr, png_colorp *palette, int *num_palette)); |
| |
| PNG_EXPORT(152, void, png_set_PLTE, (png_structrp png_ptr, |
| png_inforp info_ptr, png_const_colorp palette, int num_palette)); |
| |
| #ifdef PNG_sBIT_SUPPORTED |
| PNG_EXPORT(153, png_uint_32, png_get_sBIT, (png_const_structrp png_ptr, |
| png_inforp info_ptr, png_color_8p *sig_bit)); |
| #endif |
| |
| #ifdef PNG_sBIT_SUPPORTED |
| PNG_EXPORT(154, void, png_set_sBIT, (png_const_structrp png_ptr, |
| png_inforp info_ptr, png_const_color_8p sig_bit)); |
| #endif |
| |
| #ifdef PNG_sRGB_SUPPORTED |
| PNG_EXPORT(155, png_uint_32, png_get_sRGB, (png_const_structrp png_ptr, |
| png_const_inforp info_ptr, int *file_srgb_intent)); |
| #endif |
| |
| #ifdef PNG_sRGB_SUPPORTED |
| PNG_EXPORT(156, void, png_set_sRGB, (png_const_structrp png_ptr, |
| png_inforp info_ptr, int srgb_intent)); |
| PNG_EXPORT(157, void, png_set_sRGB_gAMA_and_cHRM, (png_const_structrp png_ptr, |
| png_inforp info_ptr, int srgb_intent)); |
| #endif |
| |
| #ifdef PNG_iCCP_SUPPORTED |
| PNG_EXPORT(158, png_uint_32, png_get_iCCP, (png_const_structrp png_ptr, |
| png_const_inforp info_ptr, png_charpp name, int *compression_type, |
| png_bytepp profile, png_uint_32 *proflen)); |
| #endif |
| |
| #ifdef PNG_iCCP_SUPPORTED |
| PNG_EXPORT(159, void, png_set_iCCP, (png_const_structrp png_ptr, |
| png_inforp info_ptr, png_const_charp name, int compression_type, |
| png_const_bytep profile, png_uint_32 proflen)); |
| #endif |
| |
| #ifdef PNG_sPLT_SUPPORTED |
| PNG_EXPORT(160, png_uint_32, png_get_sPLT, (png_const_structrp png_ptr, |
| png_const_inforp info_ptr, png_sPLT_tpp entries)); |
| #endif |
| |
| #ifdef PNG_sPLT_SUPPORTED |
| PNG_EXPORT(161, void, png_set_sPLT, (png_const_structrp png_ptr, |
| png_inforp info_ptr, png_const_sPLT_tp entries, int nentries)); |
| #endif |
| |
| #ifdef PNG_TEXT_SUPPORTED |
| /* png_get_text also returns the number of text chunks in *num_text */ |
| PNG_EXPORT(162, png_uint_32, png_get_text, (png_const_structrp png_ptr, |
| png_const_inforp info_ptr, png_textp *text_ptr, int *num_text)); |
| #endif |
| |
| /* Note while png_set_text() will accept a structure whose text, |
| * language, and translated keywords are NULL pointers, the structure |
| * returned by png_get_text will always contain regular |
| * zero-terminated C strings. They might be empty strings but |
| * they will never be NULL pointers. |
| */ |
| |
| #ifdef PNG_TEXT_SUPPORTED |
| PNG_EXPORT(163, void, png_set_text, (png_const_structrp png_ptr, |
| png_inforp info_ptr, png_const_textp text_ptr, int num_text)); |
| #endif |
| |
| #ifdef PNG_tIME_SUPPORTED |
| PNG_EXPORT(164, png_uint_32, png_get_tIME, (png_const_structrp png_ptr, |
| png_inforp info_ptr, png_timep *mod_time)); |
| #endif |
| |
| #ifdef PNG_tIME_SUPPORTED |
| PNG_EXPORT(165, void, png_set_tIME, (png_const_structrp png_ptr, |
| png_inforp info_ptr, png_const_timep mod_time)); |
| #endif |
| |
| #ifdef PNG_tRNS_SUPPORTED |
| PNG_EXPORT(166, png_uint_32, png_get_tRNS, (png_const_structrp png_ptr, |
| png_inforp info_ptr, png_bytep *trans_alpha, int *num_trans, |
| png_color_16p *trans_color)); |
| #endif |
| |
| #ifdef PNG_tRNS_SUPPORTED |
| PNG_EXPORT(167, void, png_set_tRNS, (png_structrp png_ptr, |
| png_inforp info_ptr, png_const_bytep trans_alpha, int num_trans, |
| png_const_color_16p trans_color)); |
| #endif |
| |
| #ifdef PNG_sCAL_SUPPORTED |
| PNG_FP_EXPORT(168, png_uint_32, png_get_sCAL, (png_const_structrp png_ptr, |
| png_const_inforp info_ptr, int *unit, double *width, double *height)); |
| #if (defined PNG_FLOATING_ARITHMETIC_SUPPORTED) || \ |
| (defined PNG_FLOATING_POINT_SUPPORTED) |
| /* NOTE: this API is currently implemented using floating point arithmetic, |
| * consequently it can only be used on systems with floating point support. |
| * In any case the range of values supported by png_fixed_point is small and it |
| * is highly recommended that png_get_sCAL_s be used instead. |
| */ |
| PNG_FIXED_EXPORT(214, png_uint_32, png_get_sCAL_fixed, |
| (png_const_structrp png_ptr, png_const_inforp info_ptr, int *unit, |
| png_fixed_point *width, png_fixed_point *height)); |
| #endif |
| PNG_EXPORT(169, png_uint_32, png_get_sCAL_s, |
| (png_const_structrp png_ptr, png_const_inforp info_ptr, int *unit, |
| png_charpp swidth, png_charpp sheight)); |
| |
| PNG_FP_EXPORT(170, void, png_set_sCAL, (png_const_structrp png_ptr, |
| png_inforp info_ptr, int unit, double width, double height)); |
| PNG_FIXED_EXPORT(213, void, png_set_sCAL_fixed, (png_const_structrp png_ptr, |
| png_inforp info_ptr, int unit, png_fixed_point width, |
| png_fixed_point height)); |
| PNG_EXPORT(171, void, png_set_sCAL_s, (png_const_structrp png_ptr, |
| png_inforp info_ptr, int unit, |
| png_const_charp swidth, png_const_charp sheight)); |
| #endif /* PNG_sCAL_SUPPORTED */ |
| |
| #ifdef PNG_HANDLE_AS_UNKNOWN_SUPPORTED |
| /* Provide a list of chunks and how they are to be handled, if the built-in |
| handling or default unknown chunk handling is not desired. Any chunks not |
| listed will be handled in the default manner. The IHDR and IEND chunks |
| must not be listed. Because this turns off the default handling for chunks |
| that would otherwise be recognized the behavior of libpng transformations may |
| well become incorrect! |
| keep = 0: PNG_HANDLE_CHUNK_AS_DEFAULT: follow default behavior |
| = 1: PNG_HANDLE_CHUNK_NEVER: do not keep |
| = 2: PNG_HANDLE_CHUNK_IF_SAFE: keep only if safe-to-copy |
| = 3: PNG_HANDLE_CHUNK_ALWAYS: keep even if unsafe-to-copy |
| */ |
| PNG_EXPORT(172, void, png_set_keep_unknown_chunks, (png_structrp png_ptr, |
| int keep, png_const_bytep chunk_list, int num_chunks)); |
| |
| /* The handling code is returned; the result is therefore true (non-zero) if |
| * special handling is required, false for the default handling. |
| */ |
| PNG_EXPORT(173, int, png_handle_as_unknown, (png_structrp png_ptr, |
| png_const_bytep chunk_name)); |
| #endif |
| #ifdef PNG_UNKNOWN_CHUNKS_SUPPORTED |
| PNG_EXPORT(174, void, png_set_unknown_chunks, (png_const_structrp png_ptr, |
| png_inforp info_ptr, png_const_unknown_chunkp unknowns, |
| int num_unknowns)); |
| PNG_EXPORT(175, void, png_set_unknown_chunk_location, |
| (png_const_structrp png_ptr, png_inforp info_ptr, int chunk, int location)); |
| PNG_EXPORT(176, int, png_get_unknown_chunks, (png_const_structrp png_ptr, |
| png_const_inforp info_ptr, png_unknown_chunkpp entries)); |
| #endif |
| |
| /* Png_free_data() will turn off the "valid" flag for anything it frees. |
| * If you need to turn it off for a chunk that your application has freed, |
| * you can use png_set_invalid(png_ptr, info_ptr, PNG_INFO_CHNK); |
| */ |
| PNG_EXPORT(177, void, png_set_invalid, (png_const_structrp png_ptr, |
| png_inforp info_ptr, int mask)); |
| |
| #ifdef PNG_INFO_IMAGE_SUPPORTED |
| /* The "params" pointer is currently not used and is for future expansion. */ |
| PNG_EXPORT(178, void, png_read_png, (png_structrp png_ptr, png_inforp info_ptr, |
| int transforms, png_voidp params)); |
| PNG_EXPORT(179, void, png_write_png, (png_structrp png_ptr, png_inforp info_ptr, |
| int transforms, png_voidp params)); |
| #endif |
| |
| PNG_EXPORT(180, png_const_charp, png_get_copyright, |
| (png_const_structrp png_ptr)); |
| PNG_EXPORT(181, png_const_charp, png_get_header_ver, |
| (png_const_structrp png_ptr)); |
| PNG_EXPORT(182, png_const_charp, png_get_header_version, |
| (png_const_structrp png_ptr)); |
| PNG_EXPORT(183, png_const_charp, png_get_libpng_ver, |
| (png_const_structrp png_ptr)); |
| |
| #ifdef PNG_MNG_FEATURES_SUPPORTED |
| PNG_EXPORT(184, png_uint_32, png_permit_mng_features, (png_structrp png_ptr, |
| png_uint_32 mng_features_permitted)); |
| #endif |
| |
| /* For use in png_set_keep_unknown, added to version 1.2.6 */ |
| #define PNG_HANDLE_CHUNK_AS_DEFAULT 0 |
| #define PNG_HANDLE_CHUNK_NEVER 1 |
| #define PNG_HANDLE_CHUNK_IF_SAFE 2 |
| #define PNG_HANDLE_CHUNK_ALWAYS 3 |
| |
| /* Strip the prepended error numbers ("#nnn ") from error and warning |
| * messages before passing them to the error or warning handler. |
| */ |
| #ifdef PNG_ERROR_NUMBERS_SUPPORTED |
| PNG_EXPORT(185, void, png_set_strip_error_numbers, (png_structrp png_ptr, |
| png_uint_32 strip_mode)); |
| #endif |
| |
| /* Added in libpng-1.2.6 */ |
| #ifdef PNG_SET_USER_LIMITS_SUPPORTED |
| PNG_EXPORT(186, void, png_set_user_limits, (png_structrp png_ptr, |
| png_uint_32 user_width_max, png_uint_32 user_height_max)); |
| PNG_EXPORT(187, png_uint_32, png_get_user_width_max, |
| (png_const_structrp png_ptr)); |
| PNG_EXPORT(188, png_uint_32, png_get_user_height_max, |
| (png_const_structrp png_ptr)); |
| /* Added in libpng-1.4.0 */ |
| PNG_EXPORT(189, void, png_set_chunk_cache_max, (png_structrp png_ptr, |
| png_uint_32 user_chunk_cache_max)); |
| PNG_EXPORT(190, png_uint_32, png_get_chunk_cache_max, |
| (png_const_structrp png_ptr)); |
| /* Added in libpng-1.4.1 */ |
| PNG_EXPORT(191, void, png_set_chunk_malloc_max, (png_structrp png_ptr, |
| png_alloc_size_t user_chunk_cache_max)); |
| PNG_EXPORT(192, png_alloc_size_t, png_get_chunk_malloc_max, |
| (png_const_structrp png_ptr)); |
| #endif |
| |
| #if defined(PNG_INCH_CONVERSIONS_SUPPORTED) |
| PNG_EXPORT(193, png_uint_32, png_get_pixels_per_inch, |
| (png_const_structrp png_ptr, png_const_inforp info_ptr)); |
| |
| PNG_EXPORT(194, png_uint_32, png_get_x_pixels_per_inch, |
| (png_const_structrp png_ptr, png_const_inforp info_ptr)); |
| |
| PNG_EXPORT(195, png_uint_32, png_get_y_pixels_per_inch, |
| (png_const_structrp png_ptr, png_const_inforp info_ptr)); |
| |
| PNG_FP_EXPORT(196, float, png_get_x_offset_inches, |
| (png_const_structrp png_ptr, png_const_inforp info_ptr)); |
| #ifdef PNG_FIXED_POINT_SUPPORTED /* otherwise not implemented. */ |
| PNG_FIXED_EXPORT(211, png_fixed_point, png_get_x_offset_inches_fixed, |
| (png_const_structrp png_ptr, png_const_inforp info_ptr)); |
| #endif |
| |
| PNG_FP_EXPORT(197, float, png_get_y_offset_inches, (png_const_structrp png_ptr, |
| png_const_inforp info_ptr)); |
| #ifdef PNG_FIXED_POINT_SUPPORTED /* otherwise not implemented. */ |
| PNG_FIXED_EXPORT(212, png_fixed_point, png_get_y_offset_inches_fixed, |
| (png_const_structrp png_ptr, png_const_inforp info_ptr)); |
| #endif |
| |
| # ifdef PNG_pHYs_SUPPORTED |
| PNG_EXPORT(198, png_uint_32, png_get_pHYs_dpi, (png_const_structrp png_ptr, |
| png_const_inforp info_ptr, png_uint_32 *res_x, png_uint_32 *res_y, |
| int *unit_type)); |
| # endif /* PNG_pHYs_SUPPORTED */ |
| #endif /* PNG_INCH_CONVERSIONS_SUPPORTED */ |
| |
| /* Added in libpng-1.4.0 */ |
| #ifdef PNG_IO_STATE_SUPPORTED |
| PNG_EXPORT(199, png_uint_32, png_get_io_state, (png_const_structrp png_ptr)); |
| |
| /* Removed from libpng 1.6; use png_get_io_chunk_type. */ |
| PNG_REMOVED(200, png_const_bytep, png_get_io_chunk_name, (png_structrp png_ptr), |
| PNG_DEPRECATED) |
| |
| PNG_EXPORT(216, png_uint_32, png_get_io_chunk_type, |
| (png_const_structrp png_ptr)); |
| |
| /* The flags returned by png_get_io_state() are the following: */ |
| # define PNG_IO_NONE 0x0000 /* no I/O at this moment */ |
| # define PNG_IO_READING 0x0001 /* currently reading */ |
| # define PNG_IO_WRITING 0x0002 /* currently writing */ |
| # define PNG_IO_SIGNATURE 0x0010 /* currently at the file signature */ |
| # define PNG_IO_CHUNK_HDR 0x0020 /* currently at the chunk header */ |
| # define PNG_IO_CHUNK_DATA 0x0040 /* currently at the chunk data */ |
| # define PNG_IO_CHUNK_CRC 0x0080 /* currently at the chunk crc */ |
| # define PNG_IO_MASK_OP 0x000f /* current operation: reading/writing */ |
| # define PNG_IO_MASK_LOC 0x00f0 /* current location: sig/hdr/data/crc */ |
| #endif /* ?PNG_IO_STATE_SUPPORTED */ |
| |
| /* Interlace support. The following macros are always defined so that if |
| * libpng interlace handling is turned off the macros may be used to handle |
| * interlaced images within the application. |
| */ |
| #define PNG_INTERLACE_ADAM7_PASSES 7 |
| |
| /* Two macros to return the first row and first column of the original, |
| * full, image which appears in a given pass. 'pass' is in the range 0 |
| * to 6 and the result is in the range 0 to 7. |
| */ |
| #define PNG_PASS_START_ROW(pass) (((1&~(pass))<<(3-((pass)>>1)))&7) |
| #define PNG_PASS_START_COL(pass) (((1& (pass))<<(3-(((pass)+1)>>1)))&7) |
| |
| /* A macro to return the offset between pixels in the output row for a pair of |
| * pixels in the input - effectively the inverse of the 'COL_SHIFT' macro that |
| * follows. Note that ROW_OFFSET is the offset from one row to the next whereas |
| * COL_OFFSET is from one column to the next, within a row. |
| */ |
| #define PNG_PASS_ROW_OFFSET(pass) ((pass)>2?(8>>(((pass)-1)>>1)):8) |
| #define PNG_PASS_COL_OFFSET(pass) (1<<((7-(pass))>>1)) |
| |
| /* Two macros to help evaluate the number of rows or columns in each |
| * pass. This is expressed as a shift - effectively log2 of the number or |
| * rows or columns in each 8x8 tile of the original image. |
| */ |
| #define PNG_PASS_ROW_SHIFT(pass) ((pass)>2?(8-(pass))>>1:3) |
| #define PNG_PASS_COL_SHIFT(pass) ((pass)>1?(7-(pass))>>1:3) |
| |
| /* Hence two macros to determine the number of rows or columns in a given |
| * pass of an image given its height or width. In fact these macros may |
| * return non-zero even though the sub-image is empty, because the other |
| * dimension may be empty for a small image. |
| */ |
| #define PNG_PASS_ROWS(height, pass) (((height)+(((1<<PNG_PASS_ROW_SHIFT(pass))\ |
| -1)-PNG_PASS_START_ROW(pass)))>>PNG_PASS_ROW_SHIFT(pass)) |
| #define PNG_PASS_COLS(width, pass) (((width)+(((1<<PNG_PASS_COL_SHIFT(pass))\ |
| -1)-PNG_PASS_START_COL(pass)))>>PNG_PASS_COL_SHIFT(pass)) |
| |
| /* For the reader row callbacks (both progressive and sequential) it is |
| * necessary to find the row in the output image given a row in an interlaced |
| * image, so two more macros: |
| */ |
| #define PNG_ROW_FROM_PASS_ROW(yIn, pass) \ |
| (((yIn)<<PNG_PASS_ROW_SHIFT(pass))+PNG_PASS_START_ROW(pass)) |
| #define PNG_COL_FROM_PASS_COL(xIn, pass) \ |
| (((xIn)<<PNG_PASS_COL_SHIFT(pass))+PNG_PASS_START_COL(pass)) |
| |
| /* Two macros which return a boolean (0 or 1) saying whether the given row |
| * or column is in a particular pass. These use a common utility macro that |
| * returns a mask for a given pass - the offset 'off' selects the row or |
| * column version. The mask has the appropriate bit set for each column in |
| * the tile. |
| */ |
| #define PNG_PASS_MASK(pass,off) ( \ |
| ((0x110145AF>>(((7-(off))-(pass))<<2)) & 0xF) | \ |
| ((0x01145AF0>>(((7-(off))-(pass))<<2)) & 0xF0)) |
| |
| #define PNG_ROW_IN_INTERLACE_PASS(y, pass) \ |
| ((PNG_PASS_MASK(pass,0) >> ((y)&7)) & 1) |
| #define PNG_COL_IN_INTERLACE_PASS(x, pass) \ |
| ((PNG_PASS_MASK(pass,1) >> ((x)&7)) & 1) |
| |
| #ifdef PNG_READ_COMPOSITE_NODIV_SUPPORTED |
| /* With these routines we avoid an integer divide, which will be slower on |
| * most machines. However, it does take more operations than the corresponding |
| * divide method, so it may be slower on a few RISC systems. There are two |
| * shifts (by 8 or 16 bits) and an addition, versus a single integer divide. |
| * |
| * Note that the rounding factors are NOT supposed to be the same! 128 and |
| * 32768 are correct for the NODIV code; 127 and 32767 are correct for the |
| * standard method. |
| * |
| * [Optimized code by Greg Roelofs and Mark Adler...blame us for bugs. :-) ] |
| */ |
| |
| /* fg and bg should be in `gamma 1.0' space; alpha is the opacity */ |
| |
| # define png_composite(composite, fg, alpha, bg) \ |
| { png_uint_16 temp = (png_uint_16)((png_uint_16)(fg) \ |
| * (png_uint_16)(alpha) \ |
| + (png_uint_16)(bg)*(png_uint_16)(255 \ |
| - (png_uint_16)(alpha)) + 128); \ |
| (composite) = (png_byte)((temp + (temp >> 8)) >> 8); } |
| |
| # define png_composite_16(composite, fg, alpha, bg) \ |
| { png_uint_32 temp = (png_uint_32)((png_uint_32)(fg) \ |
| * (png_uint_32)(alpha) \ |
| + (png_uint_32)(bg)*(65535 \ |
| - (png_uint_32)(alpha)) + 32768); \ |
| (composite) = (png_uint_16)((temp + (temp >> 16)) >> 16); } |
| |
| #else /* Standard method using integer division */ |
| |
| # define png_composite(composite, fg, alpha, bg) \ |
| (composite) = (png_byte)(((png_uint_16)(fg) * (png_uint_16)(alpha) + \ |
| (png_uint_16)(bg) * (png_uint_16)(255 - (png_uint_16)(alpha)) + \ |
| 127) / 255) |
| |
| # define png_composite_16(composite, fg, alpha, bg) \ |
| (composite) = (png_uint_16)(((png_uint_32)(fg) * (png_uint_32)(alpha) + \ |
| (png_uint_32)(bg)*(png_uint_32)(65535 - (png_uint_32)(alpha)) + \ |
| 32767) / 65535) |
| #endif /* PNG_READ_COMPOSITE_NODIV_SUPPORTED */ |
| |
| #ifdef PNG_READ_INT_FUNCTIONS_SUPPORTED |
| PNG_EXPORT(201, png_uint_32, png_get_uint_32, (png_const_bytep buf)); |
| PNG_EXPORT(202, png_uint_16, png_get_uint_16, (png_const_bytep buf)); |
| PNG_EXPORT(203, png_int_32, png_get_int_32, (png_const_bytep buf)); |
| #endif |
| |
| PNG_EXPORT(204, png_uint_32, png_get_uint_31, (png_const_structrp png_ptr, |
| png_const_bytep buf)); |
| /* No png_get_int_16 -- may be added if there's a real need for it. */ |
| |
| /* Place a 32-bit number into a buffer in PNG byte order (big-endian). */ |
| #ifdef PNG_WRITE_INT_FUNCTIONS_SUPPORTED |
| PNG_EXPORT(205, void, png_save_uint_32, (png_bytep buf, png_uint_32 i)); |
| #endif |
| #ifdef PNG_SAVE_INT_32_SUPPORTED |
| PNG_EXPORT(206, void, png_save_int_32, (png_bytep buf, png_int_32 i)); |
| #endif |
| |
| /* Place a 16-bit number into a buffer in PNG byte order. |
| * The parameter is declared unsigned int, not png_uint_16, |
| * just to avoid potential problems on pre-ANSI C compilers. |
| */ |
| #ifdef PNG_WRITE_INT_FUNCTIONS_SUPPORTED |
| PNG_EXPORT(207, void, png_save_uint_16, (png_bytep buf, unsigned int i)); |
| /* No png_save_int_16 -- may be added if there's a real need for it. */ |
| #endif |
| |
| #ifdef PNG_USE_READ_MACROS |
| /* Inline macros to do direct reads of bytes from the input buffer. |
| * The png_get_int_32() routine assumes we are using two's complement |
| * format for negative values, which is almost certainly true. |
| */ |
| # define png_get_uint_32(buf) \ |
| (((png_uint_32)(*(buf)) << 24) + \ |
| ((png_uint_32)(*((buf) + 1)) << 16) + \ |
| ((png_uint_32)(*((buf) + 2)) << 8) + \ |
| ((png_uint_32)(*((buf) + 3)))) |
| |
| /* From libpng-1.4.0 until 1.4.4, the png_get_uint_16 macro (but not the |
| * function) incorrectly returned a value of type png_uint_32. |
| */ |
| # define png_get_uint_16(buf) \ |
| ((png_uint_16) \ |
| (((unsigned int)(*(buf)) << 8) + \ |
| ((unsigned int)(*((buf) + 1))))) |
| |
| # define png_get_int_32(buf) \ |
| ((png_int_32)((*(buf) & 0x80) \ |
| ? -((png_int_32)((png_get_uint_32(buf) ^ 0xffffffffL) + 1)) \ |
| : (png_int_32)png_get_uint_32(buf))) |
| #endif |
| |
| /******************************************************************************* |
| * SIMPLIFIED API |
| ******************************************************************************* |
| * |
| * Please read the documentation in libpng-manual.txt (TODO: write said |
| * documentation) if you don't understand what follows. |
| * |
| * The simplified API hides the details of both libpng and the PNG file format |
| * itself. It allows PNG files to be read into a very limited number of |
| * in-memory bitmap formats or to be written from the same formats. If these |
| * formats do not accomodate your needs then you can, and should, use the more |
| * sophisticated APIs above - these support a wide variety of in-memory formats |
| * and a wide variety of sophisticated transformations to those formats as well |
| * as a wide variety of APIs to manipulate ancilliary information. |
| * |
| * To read a PNG file using the simplified API: |
| * |
| * 1) Declare a 'png_image' structure (see below) on the stack and set the |
| * version field to PNG_IMAGE_VERSION. |
| * 2) Call the appropriate png_image_begin_read... function. |
| * 3) Set the png_image 'format' member to the required sample format. |
| * 4) Allocate a buffer for the image and, if required, the color-map. |
| * 5) Call png_image_finish_read to read the image and, if required, the |
| * color-map into your buffers. |
| * |
| * There are no restrictions on the format of the PNG input itself; all valid |
| * color types, bit depths, and interlace methods are acceptable, and the |
| * input image is transformed as necessary to the requested in-memory format |
| * during the png_image_finish_read() step. The only caveat is that if you |
| * request a color-mapped image from a PNG that is full-color or makes |
| * complex use of an alpha channel the transformation is extremely lossy and the |
| * result may look terrible. |
| * |
| * To write a PNG file using the simplified API: |
| * |
| * 1) Declare a 'png_image' structure on the stack and memset() it to all zero. |
| * 2) Initialize the members of the structure that describe the image, setting |
| * the 'format' member to the format of the image samples. |
| * 3) Call the appropriate png_image_write... function with a pointer to the |
| * image and, if necessary, the color-map to write the PNG data. |
| * |
| * png_image is a structure that describes the in-memory format of an image |
| * when it is being read or defines the in-memory format of an image that you |
| * need to write: |
| */ |
| #define PNG_IMAGE_VERSION 1 |
| |
| typedef struct png_control *png_controlp; |
| typedef struct |
| { |
| png_controlp opaque; /* Initialize to NULL, free with png_image_free */ |
| png_uint_32 version; /* Set to PNG_IMAGE_VERSION */ |
| png_uint_32 width; /* Image width in pixels (columns) */ |
| png_uint_32 height; /* Image height in pixels (rows) */ |
| png_uint_32 format; /* Image format as defined below */ |
| png_uint_32 flags; /* A bit mask containing informational flags */ |
| png_uint_32 colormap_entries; |
| /* Number of entries in the color-map */ |
| |
| /* In the event of an error or warning the following field will be set to a |
| * non-zero value and the 'message' field will contain a '\0' terminated |
| * string with the libpng error or warning message. If both warnings and |
| * an error were encountered, only the error is recorded. If there |
| * are multiple warnings, only the first one is recorded. |
| * |
| * The upper 30 bits of this value are reserved, the low two bits contain |
| * a value as follows: |
| */ |
| # define PNG_IMAGE_WARNING 1 |
| # define PNG_IMAGE_ERROR 2 |
| /* |
| * The result is a two bit code such that a value more than 1 indicates |
| * a failure in the API just called: |
| * |
| * 0 - no warning or error |
| * 1 - warning |
| * 2 - error |
| * 3 - error preceded by warning |
| */ |
| # define PNG_IMAGE_FAILED(png_cntrl) ((((png_cntrl).warning_or_error)&0x03)>1) |
| |
| png_uint_32 warning_or_error; |
| |
| char message[64]; |
| } png_image, *png_imagep; |
| |
| /* The samples of the image have one to four channels whose components have |
| * original values in the range 0 to 1.0: |
| * |
| * 1: A single gray or luminance channel (G). |
| * 2: A gray/luminance channel and an alpha channel (GA). |
| * 3: Three red, green, blue color channels (RGB). |
| * 4: Three color channels and an alpha channel (RGBA). |
| * |
| * The components are encoded in one of two ways: |
| * |
| * a) As a small integer, value 0..255, contained in a single byte. For the |
| * alpha channel the original value is simply value/255. For the color or |
| * luminance channels the value is encoded according to the sRGB specification |
| * and matches the 8-bit format expected by typical display devices. |
| * |
| * The color/gray channels are not scaled (pre-multiplied) by the alpha |
| * channel and are suitable for passing to color management software. |
| * |
| * b) As a value in the range 0..65535, contained in a 2-byte integer. All |
| * channels can be converted to the original value by dividing by 65535; all |
| * channels are linear. Color channels use the RGB encoding (RGB end-points) of |
| * the sRGB specification. This encoding is identified by the |
| * PNG_FORMAT_FLAG_LINEAR flag below. |
| * |
| * When an alpha channel is present it is expected to denote pixel coverage |
| * of the color or luminance channels and is returned as an associated alpha |
| * channel: the color/gray channels are scaled (pre-multiplied) by the alpha |
| * value. |
| * |
| * The samples are either contained directly in the image data, between 1 and 8 |
| * bytes per pixel according to the encoding, or are held in a color-map indexed |
| * by bytes in the image data. In the case of a color-map the color-map entries |
| * are individual samples, encoded as above, and the image data has one byte per |
| * pixel to select the relevant sample from the color-map. |
| */ |
| |
| /* PNG_FORMAT_* |
| * |
| * #defines to be used in png_image::format. Each #define identifies a |
| * particular layout of sample data and, if present, alpha values. There are |
| * separate defines for each of the two component encodings. |
| * |
| * A format is built up using single bit flag values. All combinations are |
| * valid. Formats can be built up from the flag values or you can use one of |
| * the predefined values below. When testing formats always use the FORMAT_FLAG |
| * macros to test for individual features - future versions of the library may |
| * add new flags. |
| * |
| * When reading or writing color-mapped images the format should be set to the |
| * format of the entries in the color-map then png_image_{read,write}_colormap |
| * called to read or write the color-map and set the format correctly for the |
| * image data. Do not set the PNG_FORMAT_FLAG_COLORMAP bit directly! |
| * |
| * NOTE: libpng can be built with particular features disabled, if you see |
| * compiler errors because the definition of one of the following flags has been |
| * compiled out it is because libpng does not have the required support. It is |
| * possible, however, for the libpng configuration to enable the format on just |
| * read or just write; in that case you may see an error at run time. You can |
| * guard against this by checking for the definition of the appropriate |
| * "_SUPPORTED" macro, one of: |
| * |
| * PNG_SIMPLIFIED_{READ,WRITE}_{BGR,AFIRST}_SUPPORTED |
| */ |
| #define PNG_FORMAT_FLAG_ALPHA 0x01U /* format with an alpha channel */ |
| #define PNG_FORMAT_FLAG_COLOR 0x02U /* color format: otherwise grayscale */ |
| #define PNG_FORMAT_FLAG_LINEAR 0x04U /* 2 byte channels else 1 byte */ |
| #define PNG_FORMAT_FLAG_COLORMAP 0x08U /* image data is color-mapped */ |
| |
| #ifdef PNG_FORMAT_BGR_SUPPORTED |
| # define PNG_FORMAT_FLAG_BGR 0x10U /* BGR colors, else order is RGB */ |
| #endif |
| |
| #ifdef PNG_FORMAT_AFIRST_SUPPORTED |
| # define PNG_FORMAT_FLAG_AFIRST 0x20U /* alpha channel comes first */ |
| #endif |
| |
| /* Commonly used formats have predefined macros. |
| * |
| * First the single byte (sRGB) formats: |
| */ |
| #define PNG_FORMAT_GRAY 0 |
| #define PNG_FORMAT_GA PNG_FORMAT_FLAG_ALPHA |
| #define PNG_FORMAT_AG (PNG_FORMAT_GA|PNG_FORMAT_FLAG_AFIRST) |
| #define PNG_FORMAT_RGB PNG_FORMAT_FLAG_COLOR |
| #define PNG_FORMAT_BGR (PNG_FORMAT_FLAG_COLOR|PNG_FORMAT_FLAG_BGR) |
| #define PNG_FORMAT_RGBA (PNG_FORMAT_RGB|PNG_FORMAT_FLAG_ALPHA) |
| #define PNG_FORMAT_ARGB (PNG_FORMAT_RGBA|PNG_FORMAT_FLAG_AFIRST) |
| #define PNG_FORMAT_BGRA (PNG_FORMAT_BGR|PNG_FORMAT_FLAG_ALPHA) |
| #define PNG_FORMAT_ABGR (PNG_FORMAT_BGRA|PNG_FORMAT_FLAG_AFIRST) |
| |
| /* Then the linear 2-byte formats. When naming these "Y" is used to |
| * indicate a luminance (gray) channel. |
| */ |
| #define PNG_FORMAT_LINEAR_Y PNG_FORMAT_FLAG_LINEAR |
| #define PNG_FORMAT_LINEAR_Y_ALPHA (PNG_FORMAT_FLAG_LINEAR|PNG_FORMAT_FLAG_ALPHA) |
| #define PNG_FORMAT_LINEAR_RGB (PNG_FORMAT_FLAG_LINEAR|PNG_FORMAT_FLAG_COLOR) |
| #define PNG_FORMAT_LINEAR_RGB_ALPHA \ |
| (PNG_FORMAT_FLAG_LINEAR|PNG_FORMAT_FLAG_COLOR|PNG_FORMAT_FLAG_ALPHA) |
| |
| /* With color-mapped formats the image data is one byte for each pixel, the byte |
| * is an index into the color-map which is formatted as above. To obtain a |
| * color-mapped format it is sufficient just to add the PNG_FOMAT_FLAG_COLORMAP |
| * to one of the above definitions, or you can use one of the definitions below. |
| */ |
| #define PNG_FORMAT_RGB_COLORMAP (PNG_FORMAT_RGB|PNG_FORMAT_FLAG_COLORMAP) |
| #define PNG_FORMAT_BGR_COLORMAP (PNG_FORMAT_BGR|PNG_FORMAT_FLAG_COLORMAP) |
| #define PNG_FORMAT_RGBA_COLORMAP (PNG_FORMAT_RGBA|PNG_FORMAT_FLAG_COLORMAP) |
| #define PNG_FORMAT_ARGB_COLORMAP (PNG_FORMAT_ARGB|PNG_FORMAT_FLAG_COLORMAP) |
| #define PNG_FORMAT_BGRA_COLORMAP (PNG_FORMAT_BGRA|PNG_FORMAT_FLAG_COLORMAP) |
| #define PNG_FORMAT_ABGR_COLORMAP (PNG_FORMAT_ABGR|PNG_FORMAT_FLAG_COLORMAP) |
| |
| /* PNG_IMAGE macros |
| * |
| * These are convenience macros to derive information from a png_image |
| * structure. The PNG_IMAGE_SAMPLE_ macros return values appropriate to the |
| * actual image sample values - either the entries in the color-map or the |
| * pixels in the image. The PNG_IMAGE_PIXEL_ macros return corresponding values |
| * for the pixels and will always return 1 for color-mapped formats. The |
| * remaining macros return information about the rows in the image and the |
| * complete image. |
| * |
| * NOTE: All the macros that take a png_image::format parameter are compile time |
| * constants if the format parameter is, itself, a constant. Therefore these |
| * macros can be used in array declarations and case labels where required. |
| * Similarly the macros are also pre-processor constants (sizeof is not used) so |
| * they can be used in #if tests. |
| * |
| * First the information about the samples. |
| */ |
| #define PNG_IMAGE_SAMPLE_CHANNELS(fmt)\ |
| (((fmt)&(PNG_FORMAT_FLAG_COLOR|PNG_FORMAT_FLAG_ALPHA))+1) |
| /* Return the total number of channels in a given format: 1..4 */ |
| |
| #define PNG_IMAGE_SAMPLE_COMPONENT_SIZE(fmt)\ |
| ((((fmt) & PNG_FORMAT_FLAG_LINEAR) >> 2)+1) |
| /* Return the size in bytes of a single component of a pixel or color-map |
| * entry (as appropriate) in the image: 1 or 2. |
| */ |
| |
| #define PNG_IMAGE_SAMPLE_SIZE(fmt)\ |
| (PNG_IMAGE_SAMPLE_CHANNELS(fmt) * PNG_IMAGE_SAMPLE_COMPONENT_SIZE(fmt)) |
| /* This is the size of the sample data for one sample. If the image is |
| * color-mapped it is the size of one color-map entry (and image pixels are |
| * one byte in size), otherwise it is the size of one image pixel. |
| */ |
| |
| #define PNG_IMAGE_MAXIMUM_COLORMAP_COMPONENTS(fmt)\ |
| (PNG_IMAGE_SAMPLE_CHANNELS(fmt) * 256) |
| /* The maximum size of the color-map required by the format expressed in a |
| * count of components. This can be used to compile-time allocate a |
| * color-map: |
| * |
| * png_uint_16 colormap[PNG_IMAGE_MAXIMUM_COLORMAP_COMPONENTS(linear_fmt)]; |
| * |
| * png_byte colormap[PNG_IMAGE_MAXIMUM_COLORMAP_COMPONENTS(sRGB_fmt)]; |
| * |
| * Alternatively use the PNG_IMAGE_COLORMAP_SIZE macro below to use the |
| * information from one of the png_image_begin_read_ APIs and dynamically |
| * allocate the required memory. |
| */ |
| |
| /* Corresponding information about the pixels */ |
| #define PNG_IMAGE_PIXEL_(test,fmt)\ |
| (((fmt)&PNG_FORMAT_FLAG_COLORMAP)?1:test(fmt)) |
| |
| #define PNG_IMAGE_PIXEL_CHANNELS(fmt)\ |
| PNG_IMAGE_PIXEL_(PNG_IMAGE_SAMPLE_CHANNELS,fmt) |
| /* The number of separate channels (components) in a pixel; 1 for a |
| * color-mapped image. |
| */ |
| |
| #define PNG_IMAGE_PIXEL_COMPONENT_SIZE(fmt)\ |
| PNG_IMAGE_PIXEL_(PNG_IMAGE_SAMPLE_COMPONENT_SIZE,fmt) |
| /* The size, in bytes, of each component in a pixel; 1 for a color-mapped |
| * image. |
| */ |
| |
| #define PNG_IMAGE_PIXEL_SIZE(fmt) PNG_IMAGE_PIXEL_(PNG_IMAGE_SAMPLE_SIZE,fmt) |
| /* The size, in bytes, of a complete pixel; 1 for a color-mapped image. */ |
| |
| /* Information about the whole row, or whole image */ |
| #define PNG_IMAGE_ROW_STRIDE(image)\ |
| (PNG_IMAGE_PIXEL_CHANNELS((image).format) * (image).width) |
| /* Return the total number of components in a single row of the image; this |
| * is the minimum 'row stride', the minimum count of components between each |
| * row. For a color-mapped image this is the minimum number of bytes in a |
| * row. |
| */ |
| |
| #define PNG_IMAGE_BUFFER_SIZE(image, row_stride)\ |
| (PNG_IMAGE_PIXEL_COMPONENT_SIZE((image).format)*(image).height*(row_stride)) |
| /* Return the size, in bytes, of an image buffer given a png_image and a row |
| * stride - the number of components to leave space for in each row. |
| */ |
| |
| #define PNG_IMAGE_SIZE(image)\ |
| PNG_IMAGE_BUFFER_SIZE(image, PNG_IMAGE_ROW_STRIDE(image)) |
| /* Return the size, in bytes, of the image in memory given just a png_image; |
| * the row stride is the minimum stride required for the image. |
| */ |
| |
| #define PNG_IMAGE_COLORMAP_SIZE(image)\ |
| (PNG_IMAGE_SAMPLE_SIZE((image).format) * (image).colormap_entries) |
| /* Return the size, in bytes, of the color-map of this image. If the image |
| * format is not a color-map format this will return a size sufficient for |
| * 256 entries in the given format; check PNG_IMAGE_FORMAT_FLAG_COLORMAP if |
| * you don't want to allocate a color-map in this case. |
| */ |
| |
| /* PNG_IMAGE_FLAG_* |
| * |
| * Flags containing additional information about the image are held in the |
| * 'flags' field of png_image. |
| */ |
| #define PNG_IMAGE_FLAG_COLORSPACE_NOT_sRGB 0x01 |
| /* This indicates the the RGB values of the in-memory bitmap do not |
| * correspond to the red, green and blue end-points defined by sRGB. |
| */ |
| |
| #ifdef PNG_SIMPLIFIED_READ_SUPPORTED |
| /* READ APIs |
| * --------- |
| * |
| * The png_image passed to the read APIs must have been initialized by setting |
| * the png_controlp field 'opaque' to NULL (or, safer, memset the whole thing.) |
| */ |
| #ifdef PNG_STDIO_SUPPORTED |
| PNG_EXPORT(234, int, png_image_begin_read_from_file, (png_imagep image, |
| const char *file_name)); |
| /* The named file is opened for read and the image header is filled in |
| * from the PNG header in the file. |
| */ |
| |
| PNG_EXPORT(235, int, png_image_begin_read_from_stdio, (png_imagep image, |
| FILE* file)); |
| /* The PNG header is read from the stdio FILE object. */ |
| #endif /* PNG_STDIO_SUPPORTED */ |
| |
| PNG_EXPORT(236, int, png_image_begin_read_from_memory, (png_imagep image, |
| png_const_voidp memory, png_size_t size)); |
| /* The PNG header is read from the given memory buffer. */ |
| |
| PNG_EXPORT(237, int, png_image_finish_read, (png_imagep image, |
| png_colorp background, void *buffer, png_int_32 row_stride, |
| void *colormap)); |
| /* Finish reading the image into the supplied buffer and clean up the |
| * png_image structure. |
| * |
| * row_stride is the step, in byte or 2-byte units as appropriate, |
| * between adjacent rows. A positive stride indicates that the top-most row |
| * is first in the buffer - the normal top-down arrangement. A negative |
| * stride indicates that the bottom-most row is first in the buffer. |
| * |
| * background need only be supplied if an alpha channel must be removed from |
| * a png_byte format and the removal is to be done by compositing on a solid |
| * color; otherwise it may be NULL and any composition will be done directly |
| * onto the buffer. The value is an sRGB color to use for the background, |
| * for grayscale output the green channel is used. |
| * |
| * background must be supplied when an alpha channel must be removed from a |
| * single byte color-mapped output format, in other words if: |
| * |
| * 1) The original format from png_image_begin_read_from_* had |
| * PNG_FORMAT_FLAG_ALPHA set. |
| * 2) The format set by the application does not. |
| * 3) The format set by the application has PNG_FORMAT_FLAG_COLORMAP set and |
| * PNG_FORMAT_FLAG_LINEAR *not* set. |
| * |
| * For linear output removing the alpha channel is always done by compositing |
| * on black and background is ignored.: |
| * |
| * colormap must be supplied when PNG_FORMAT_FLAG_COLORMAP is set. It must |
| * be at least the size (in bytes) returned by PNG_IMAGE_COLORMAP_SIZE. |
| * image->colormap_entries will be updated to the actual number of entries |
| * written to the colormap; this may be less than the original value. |
| */ |
| |
| PNG_EXPORT(238, void, png_image_free, (png_imagep image)); |
| /* Free any data allocated by libpng in image->opaque, setting the pointer to |
| * NULL. May be called at any time after the structure is initialized. |
| */ |
| #endif /* PNG_SIMPLIFIED_READ_SUPPORTED */ |
| |
| #ifdef PNG_SIMPLIFIED_WRITE_SUPPORTED |
| /* WRITE APIS |
| * ---------- |
| * For write you must initialize a png_image structure to describe the image to |
| * be written. To do this use memset to set the whole structure to 0 then |
| * initialize fields describing your image. |
| * |
| * version: must be set to PNG_IMAGE_VERSION |
| * opaque: must be initialized to NULL |
| * width: image width in pixels |
| * height: image height in rows |
| * format: the format of the data (image and color-map) you wish to write |
| * flags: set to 0 unless one of the defined flags applies; set |
| * PNG_IMAGE_FLAG_COLORSPACE_NOT_sRGB for color format images where the RGB |
| * values do not correspond to the colors in sRGB. |
| * colormap_entries: set to the number of entries in the color-map (0 to 256) |
| */ |
| PNG_EXPORT(239, int, png_image_write_to_file, (png_imagep image, |
| const char *file, int convert_to_8bit, const void *buffer, |
| png_int_32 row_stride, const void *colormap)); |
| /* Write the image to the named file. */ |
| |
| PNG_EXPORT(240, int, png_image_write_to_stdio, (png_imagep image, FILE *file, |
| int convert_to_8_bit, const void *buffer, png_int_32 row_stride, |
| const void *colormap)); |
| /* Write the image to the given (FILE*). */ |
| |
| /* With both write APIs if image is in one of the linear formats with 16-bit |
| * data then setting convert_to_8_bit will cause the output to be an 8-bit PNG |
| * gamma encoded according to the sRGB specification, otherwise a 16-bit linear |
| * encoded PNG file is written. |
| * |
| * With color-mapped data formats the colormap parameter point to a color-map |
| * with at least image->colormap_entries encoded in the specified format. If |
| * the format is linear the written PNG color-map will be converted to sRGB |
| * regardless of the convert_to_8_bit flag. |
| * |
| * With all APIs row_stride is handled as in the read APIs - it is the spacing |
| * from one row to the next in component sized units (1 or 2 bytes) and if |
| * negative indicates a bottom-up row layout in the buffer. |
| * |
| * Note that the write API does not support interlacing or sub-8-bit pixels. |
| */ |
| #endif /* PNG_SIMPLIFIED_WRITE_SUPPORTED */ |
| /******************************************************************************* |
| * END OF SIMPLIFIED API |
| ******************************************************************************/ |
| |
| /* Maintainer: Put new public prototypes here ^, in libpng.3, and project |
| * defs |
| */ |
| |
| /* The last ordinal number (this is the *last* one already used; the next |
| * one to use is one more than this.) Maintainer, remember to add an entry to |
| * scripts/symbols.def as well. |
| */ |
| #ifdef PNG_EXPORT_LAST_ORDINAL |
| PNG_EXPORT_LAST_ORDINAL(241); |
| #endif |
| |
| #ifdef __cplusplus |
| } |
| #endif |
| |
| #endif /* PNG_VERSION_INFO_ONLY */ |
| /* Do not put anything past this line */ |
| #endif /* PNG_H */ |
