| |
| /* png.h - header file for PNG reference library |
| * |
| * libpng version 1.4.12 - July 10, 2012 |
| * Copyright (c) 1998-2011 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 1.4.12 - July 10, 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] |
| * 1.4.1rc02-04 14 10401 14.so.14.1[.0] |
| * 1.4.1 14 10401 14.so.14.1[.0] |
| * 1.4.2beta01 14 10402 14.so.14.2[.0] |
| * 1.4.2rc02-06 14 10402 14.so.14.2[.0] |
| * 1.4.2 14 10402 14.so.14.2[.0] |
| * 1.4.3beta01-05 14 10403 14.so.14.3[.0] |
| * 1.4.3rc01-03 14 10403 14.so.14.3[.0] |
| * 1.4.3 14 10403 14.so.14.3[.0] |
| * 1.4.4beta01-08 14 10404 14.so.14.4[.0] |
| * 1.4.4rc01-05 14 10404 14.so.14.4[.0] |
| * 1.4.4 14 10404 14.so.14.4[.0] |
| * 1.4.5beta01-04 14 10405 14.so.14.5[.0] |
| * 1.4.5rc01 14 10405 14.so.14.5[.0] |
| * 1.4.5beta05-07 14 10405 14.so.14.5[.0] |
| * 1.4.5rc02-03 14 10405 14.so.14.5[.0] |
| * 1.4.5 14 10405 14.so.14.5[.0] |
| * 1.4.6beta01-07 14 10406 14.so.14.6[.0] |
| * 1.4.6rc01 14 10406 14.so.14.6[.0] |
| * 1.4.6 14 10406 14.so.14.6[.0] |
| * 1.4.7rc01 14 10407 14.so.14.7[.0] |
| * 1.4.7 14 10407 14.so.14.7[.0] |
| * 1.4.8beta01-05 14 10408 14.so.14.8[.0] |
| * 1.4.8rc01 14 10408 14.so.14.8[.0] |
| * 1.4.8 14 10408 14.so.14.8[.0] |
| * 1.4.9beta01 14 10409 14.so.14.9[.0] |
| * 1.4.9rc01 14 10409 14.so.14.9[.0] |
| * 1.4.9 14 10409 14.so.14.9[.0] |
| * 1.4.10beta01 14 10410 14.so.14.10[.0] |
| * 1.4.10rc01-02 14 10410 14.so.14.10[.0] |
| * 1.4.10 14 10410 14.so.14.10[.0] |
| * 1.4.11rc01 14 10411 14.so.14.11[.0] |
| * 1.4.11 14 10411 14.so.14.11[.0] |
| * 1.4.12 14 10412 14.so.14.12[.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 "rcNN". |
| * |
| * 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.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 1.4.12, July 10, 2012, are |
| * Copyright (c) 2004, 2006-2010 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: |
| * ========================= |
| * |
| * July 10, 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 1.4.12 are Y2K compliant. It is my belief that earlier |
| * versions were also Y2K compliant. |
| * |
| * Libpng only has three year fields. One is a 2-byte unsigned integer |
| * that will hold years up to 65535. The other two hold the date in text |
| * format, and will hold years up to 9999. |
| * |
| * The integer is |
| * "png_uint_16 year" in png_time_struct. |
| * |
| * The strings are |
| * "png_charp time_buffer" in png_struct and |
| * "near_time_buffer", which is a local character string in png.c. |
| * |
| * 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.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. |
| */ |
| |
| /* Version information for png.h - this should match the version in png.c */ |
| #define PNG_LIBPNG_VER_STRING "1.4.12" |
| #define PNG_HEADER_VERSION_STRING \ |
| " libpng version 1.4.12 - July 10, 2012\n" |
| |
| #define PNG_LIBPNG_VER_SONUM 14 |
| #define PNG_LIBPNG_VER_DLLNUM 14 |
| |
| /* These should match the first 3 components of PNG_LIBPNG_VER_STRING: */ |
| #define PNG_LIBPNG_VER_MAJOR 1 |
| #define PNG_LIBPNG_VER_MINOR 4 |
| #define PNG_LIBPNG_VER_RELEASE 12 |
| /* This should match the numeric part of the final component of |
| * PNG_LIBPNG_VER_STRING, omitting any leading zero: |
| */ |
| |
| #define PNG_LIBPNG_VER_BUILD 0 |
| |
| /* 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_STABLE |
| |
| /* 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 10412 /* 1.4.12 */ |
| |
| #ifndef PNG_VERSION_INFO_ONLY |
| /* Include the compression library's header */ |
| #include "zlib.h" |
| #endif |
| |
| /* Include all user configurable info, including optional assembler routines */ |
| #include "pngconf.h" |
| |
| /* |
| * 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 |
| # 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 */ |
| |
| /* This file is arranged in several sections. The first section contains |
| * structure and type definitions. The second section contains the external |
| * library functions, while the third has the internal library functions, |
| * which applications aren't expected to use directly. |
| */ |
| |
| /* Variables declared in png.c - only it needs to define PNG_NO_EXTERN */ |
| #if !defined(PNG_NO_EXTERN) || defined(PNG_ALWAYS_EXTERN) |
| /* Version information for C files, stored in png.c. This had better match |
| * the version above. |
| */ |
| #define png_libpng_ver png_get_header_ver(NULL) |
| |
| #endif /* PNG_NO_EXTERN */ |
| |
| /* Three color definitions. The order of the red, green, and blue, (and the |
| * exact size) is not important, although the size of the fields need to |
| * be png_byte or png_uint_16 (as defined below). |
| */ |
| typedef struct png_color_struct |
| { |
| png_byte red; |
| png_byte green; |
| png_byte blue; |
| } png_color; |
| typedef png_color FAR * png_colorp; |
| typedef png_color FAR * FAR * png_colorpp; |
| |
| typedef struct png_color_16_struct |
| { |
| png_byte index; /* used for palette files */ |
| png_uint_16 red; /* for use in red green blue files */ |
| png_uint_16 green; |
| png_uint_16 blue; |
| png_uint_16 gray; /* for use in grayscale files */ |
| } png_color_16; |
| typedef png_color_16 FAR * png_color_16p; |
| typedef png_color_16 FAR * FAR * png_color_16pp; |
| |
| typedef struct png_color_8_struct |
| { |
| png_byte red; /* for use in red green blue files */ |
| png_byte green; |
| png_byte blue; |
| png_byte gray; /* for use in grayscale files */ |
| png_byte alpha; /* for alpha channel files */ |
| } png_color_8; |
| typedef png_color_8 FAR * png_color_8p; |
| typedef png_color_8 FAR * FAR * png_color_8pp; |
| |
| /* |
| * The following two structures are used for the in-core representation |
| * of sPLT chunks. |
| */ |
| typedef struct png_sPLT_entry_struct |
| { |
| png_uint_16 red; |
| png_uint_16 green; |
| png_uint_16 blue; |
| png_uint_16 alpha; |
| png_uint_16 frequency; |
| } png_sPLT_entry; |
| typedef png_sPLT_entry FAR * png_sPLT_entryp; |
| typedef png_sPLT_entry FAR * FAR * png_sPLT_entrypp; |
| |
| /* When the depth of the sPLT palette is 8 bits, the color and alpha samples |
| * occupy the LSB of their respective members, and the MSB of each member |
| * is zero-filled. The frequency member always occupies the full 16 bits. |
| */ |
| |
| typedef struct png_sPLT_struct |
| { |
| png_charp name; /* palette name */ |
| png_byte depth; /* depth of palette samples */ |
| png_sPLT_entryp entries; /* palette entries */ |
| png_int_32 nentries; /* number of palette entries */ |
| } png_sPLT_t; |
| typedef png_sPLT_t FAR * png_sPLT_tp; |
| typedef png_sPLT_t FAR * FAR * png_sPLT_tpp; |
| |
| #ifdef PNG_TEXT_SUPPORTED |
| /* png_text holds the contents of a text/ztxt/itxt chunk in a PNG file, |
| * and whether that contents is compressed or not. The "key" field |
| * points to a regular zero-terminated C string. The "text", "lang", and |
| * "lang_key" fields can be regular C strings, empty strings, or NULL pointers. |
| * However, the * structure returned by png_get_text() will always contain |
| * regular zero-terminated C strings (possibly empty), never NULL pointers, |
| * so they can be safely used in printf() and other string-handling functions. |
| */ |
| typedef struct png_text_struct |
| { |
| int compression; /* compression value: |
| -1: tEXt, none |
| 0: zTXt, deflate |
| 1: iTXt, none |
| 2: iTXt, deflate */ |
| png_charp key; /* keyword, 1-79 character description of "text" */ |
| png_charp text; /* comment, may be an empty string (ie "") |
| or a NULL pointer */ |
| png_size_t text_length; /* length of the text string */ |
| #ifdef PNG_iTXt_SUPPORTED |
| png_size_t itxt_length; /* length of the itxt string */ |
| png_charp lang; /* language code, 0-79 characters |
| or a NULL pointer */ |
| png_charp lang_key; /* keyword translated UTF-8 string, 0 or more |
| chars or a NULL pointer */ |
| #endif |
| } png_text; |
| typedef png_text FAR * png_textp; |
| typedef png_text FAR * FAR * png_textpp; |
| #endif |
| |
| /* Supported compression types for text in PNG files (tEXt, and zTXt). |
| * The values of the PNG_TEXT_COMPRESSION_ defines should NOT be changed. */ |
| #define PNG_TEXT_COMPRESSION_NONE_WR -3 |
| #define PNG_TEXT_COMPRESSION_zTXt_WR -2 |
| #define PNG_TEXT_COMPRESSION_NONE -1 |
| #define PNG_TEXT_COMPRESSION_zTXt 0 |
| #define PNG_ITXT_COMPRESSION_NONE 1 |
| #define PNG_ITXT_COMPRESSION_zTXt 2 |
| #define PNG_TEXT_COMPRESSION_LAST 3 /* Not a valid value */ |
| |
| /* png_time is a way to hold the time in an machine independent way. |
| * Two conversions are provided, both from time_t and struct tm. There |
| * is no portable way to convert to either of these structures, as far |
| * as I know. If you know of a portable way, send it to me. As a side |
| * note - PNG has always been Year 2000 compliant! |
| */ |
| typedef struct png_time_struct |
| { |
| png_uint_16 year; /* full year, as in, 1995 */ |
| png_byte month; /* month of year, 1 - 12 */ |
| png_byte day; /* day of month, 1 - 31 */ |
| png_byte hour; /* hour of day, 0 - 23 */ |
| png_byte minute; /* minute of hour, 0 - 59 */ |
| png_byte second; /* second of minute, 0 - 60 (for leap seconds) */ |
| } png_time; |
| typedef png_time FAR * png_timep; |
| typedef png_time FAR * FAR * png_timepp; |
| |
| #if defined(PNG_UNKNOWN_CHUNKS_SUPPORTED) || \ |
| 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 FAR * png_unknown_chunkp; |
| typedef png_unknown_chunk FAR * FAR * png_unknown_chunkpp; |
| #endif |
| |
| /* png_info is a structure that holds the information in a PNG file so |
| * that the application can find out the characteristics of the image. |
| * If you are reading the file, this structure will tell you what is |
| * in the PNG file. If you are writing the file, fill in the information |
| * you want to put into the PNG file, then call png_write_info(). |
| * The names chosen should be very close to the PNG specification, so |
| * consult that document for information about the meaning of each field. |
| * |
| * With libpng < 0.95, it was only possible to directly set and read the |
| * the values in the png_info_struct, which meant that the contents and |
| * order of the values had to remain fixed. With libpng 0.95 and later, |
| * however, there are now functions that abstract the contents of |
| * png_info_struct from the application, so this makes it easier to use |
| * libpng with dynamic libraries, and even makes it possible to use |
| * libraries that don't have all of the libpng ancillary chunk-handing |
| * functionality. |
| * |
| * In any case, the order of the parameters in png_info_struct should NOT |
| * be changed for as long as possible to keep compatibility with applications |
| * that use the old direct-access method with png_info_struct. |
| * |
| * The following members may have allocated storage attached that should be |
| * cleaned up before the structure is discarded: palette, trans, text, |
| * pcal_purpose, pcal_units, pcal_params, hist, iccp_name, iccp_profile, |
| * splt_palettes, scal_unit, row_pointers, and unknowns. By default, these |
| * are automatically freed when the info structure is deallocated, if they were |
| * allocated internally by libpng. This behavior can be changed by means |
| * of the png_data_freer() function. |
| * |
| * More allocation details: all the chunk-reading functions that |
| * change these members go through the corresponding png_set_* |
| * functions. A function to clear these members is available: see |
| * png_free_data(). The png_set_* functions do not depend on being |
| * able to point info structure members to any of the storage they are |
| * passed (they make their own copies), EXCEPT that the png_set_text |
| * functions use the same storage passed to them in the text_ptr or |
| * itxt_ptr structure argument, and the png_set_rows and png_set_unknowns |
| * functions do not make their own copies. |
| */ |
| typedef struct png_info_struct |
| { |
| /* the following are necessary for every PNG file */ |
| png_uint_32 width PNG_DEPSTRUCT; /* width of image in pixels (from IHDR) */ |
| png_uint_32 height PNG_DEPSTRUCT; /* height of image in pixels (from IHDR) */ |
| png_uint_32 valid PNG_DEPSTRUCT; /* valid chunk data (see PNG_INFO_ |
| below) */ |
| png_size_t rowbytes PNG_DEPSTRUCT; /* bytes needed to hold an untransformed |
| row */ |
| png_colorp palette PNG_DEPSTRUCT; /* array of color values |
| (valid & PNG_INFO_PLTE) */ |
| png_uint_16 num_palette PNG_DEPSTRUCT; /* number of color entries in |
| "palette" (PLTE) */ |
| png_uint_16 num_trans PNG_DEPSTRUCT; /* number of transparent palette |
| color (tRNS) */ |
| png_byte bit_depth PNG_DEPSTRUCT; /* 1, 2, 4, 8, or 16 bits/channel |
| (from IHDR) */ |
| png_byte color_type PNG_DEPSTRUCT; /* see PNG_COLOR_TYPE_ below |
| (from IHDR) */ |
| /* The following three should have been named *_method not *_type */ |
| png_byte compression_type PNG_DEPSTRUCT; /* must be |
| PNG_COMPRESSION_TYPE_BASE (IHDR) */ |
| png_byte filter_type PNG_DEPSTRUCT; /* must be PNG_FILTER_TYPE_BASE |
| (from IHDR) */ |
| png_byte interlace_type PNG_DEPSTRUCT; /* One of PNG_INTERLACE_NONE, |
| PNG_INTERLACE_ADAM7 */ |
| |
| /* The following is informational only on read, and not used on writes. */ |
| png_byte channels PNG_DEPSTRUCT; /* number of data channels per |
| pixel (1, 2, 3, 4) */ |
| png_byte pixel_depth PNG_DEPSTRUCT; /* number of bits per pixel */ |
| png_byte spare_byte PNG_DEPSTRUCT; /* to align the data, and for |
| future use */ |
| png_byte signature[8] PNG_DEPSTRUCT; /* magic bytes read by libpng |
| from start of file */ |
| |
| /* The rest of the data is optional. If you are reading, check the |
| * valid field to see if the information in these are valid. If you |
| * are writing, set the valid field to those chunks you want written, |
| * and initialize the appropriate fields below. |
| */ |
| |
| #if defined(PNG_gAMA_SUPPORTED) && defined(PNG_FLOATING_POINT_SUPPORTED) |
| /* The gAMA chunk describes the gamma characteristics of the system |
| * on which the image was created, normally in the range [1.0, 2.5]. |
| * Data is valid if (valid & PNG_INFO_gAMA) is non-zero. |
| */ |
| float gamma PNG_DEPSTRUCT; /* gamma value of image, |
| if (valid & PNG_INFO_gAMA) */ |
| #endif |
| |
| #ifdef PNG_sRGB_SUPPORTED |
| /* GR-P, 0.96a */ |
| /* Data valid if (valid & PNG_INFO_sRGB) non-zero. */ |
| png_byte srgb_intent PNG_DEPSTRUCT; /* sRGB rendering intent |
| [0, 1, 2, or 3] */ |
| #endif |
| |
| #ifdef PNG_TEXT_SUPPORTED |
| /* The tEXt, and zTXt chunks contain human-readable textual data in |
| * uncompressed, compressed, and optionally compressed forms, respectively. |
| * The data in "text" is an array of pointers to uncompressed, |
| * null-terminated C strings. Each chunk has a keyword that describes the |
| * textual data contained in that chunk. Keywords are not required to be |
| * unique, and the text string may be empty. Any number of text chunks may |
| * be in an image. |
| */ |
| int num_text PNG_DEPSTRUCT; /* number of comments read/to write */ |
| int max_text PNG_DEPSTRUCT; /* current size of text array */ |
| png_textp text PNG_DEPSTRUCT; /* array of comments read/to write */ |
| #endif /* PNG_TEXT_SUPPORTED */ |
| |
| #ifdef PNG_tIME_SUPPORTED |
| /* The tIME chunk holds the last time the displayed image data was |
| * modified. See the png_time struct for the contents of this struct. |
| */ |
| png_time mod_time PNG_DEPSTRUCT; |
| #endif |
| |
| #ifdef PNG_sBIT_SUPPORTED |
| /* The sBIT chunk specifies the number of significant high-order bits |
| * in the pixel data. Values are in the range [1, bit_depth], and are |
| * only specified for the channels in the pixel data. The contents of |
| * the low-order bits is not specified. Data is valid if |
| * (valid & PNG_INFO_sBIT) is non-zero. |
| */ |
| png_color_8 sig_bit PNG_DEPSTRUCT; /* significant bits in color channels */ |
| #endif |
| |
| #if defined(PNG_tRNS_SUPPORTED) || defined(PNG_READ_EXPAND_SUPPORTED) || \ |
| defined(PNG_READ_BACKGROUND_SUPPORTED) |
| /* The tRNS chunk supplies transparency data for paletted images and |
| * other image types that don't need a full alpha channel. There are |
| * "num_trans" transparency values for a paletted image, stored in the |
| * same order as the palette colors, starting from index 0. Values |
| * for the data are in the range [0, 255], ranging from fully transparent |
| * to fully opaque, respectively. For non-paletted images, there is a |
| * single color specified that should be treated as fully transparent. |
| * Data is valid if (valid & PNG_INFO_tRNS) is non-zero. |
| */ |
| png_bytep trans_alpha PNG_DEPSTRUCT; /* alpha values for paletted |
| image */ |
| png_color_16 trans_color PNG_DEPSTRUCT; /* transparent color for |
| non-palette image */ |
| #endif |
| |
| #if defined(PNG_bKGD_SUPPORTED) || defined(PNG_READ_BACKGROUND_SUPPORTED) |
| /* The bKGD chunk gives the suggested image background color if the |
| * display program does not have its own background color and the image |
| * is needs to composited onto a background before display. The colors |
| * in "background" are normally in the same color space/depth as the |
| * pixel data. Data is valid if (valid & PNG_INFO_bKGD) is non-zero. |
| */ |
| png_color_16 background PNG_DEPSTRUCT; |
| #endif |
| |
| #ifdef PNG_oFFs_SUPPORTED |
| /* The oFFs chunk gives the offset in "offset_unit_type" units rightwards |
| * and downwards from the top-left corner of the display, page, or other |
| * application-specific co-ordinate space. See the PNG_OFFSET_ defines |
| * below for the unit types. Valid if (valid & PNG_INFO_oFFs) non-zero. |
| */ |
| png_int_32 x_offset PNG_DEPSTRUCT; /* x offset on page */ |
| png_int_32 y_offset PNG_DEPSTRUCT; /* y offset on page */ |
| png_byte offset_unit_type PNG_DEPSTRUCT; /* offset units type */ |
| #endif |
| |
| #ifdef PNG_pHYs_SUPPORTED |
| /* The pHYs chunk gives the physical pixel density of the image for |
| * display or printing in "phys_unit_type" units (see PNG_RESOLUTION_ |
| * defines below). Data is valid if (valid & PNG_INFO_pHYs) is non-zero. |
| */ |
| png_uint_32 x_pixels_per_unit PNG_DEPSTRUCT; /* horizontal pixel density */ |
| png_uint_32 y_pixels_per_unit PNG_DEPSTRUCT; /* vertical pixel density */ |
| png_byte phys_unit_type PNG_DEPSTRUCT; /* resolution type (see |
| PNG_RESOLUTION_ below) */ |
| #endif |
| |
| #ifdef PNG_hIST_SUPPORTED |
| /* The hIST chunk contains the relative frequency or importance of the |
| * various palette entries, so that a viewer can intelligently select a |
| * reduced-color palette, if required. Data is an array of "num_palette" |
| * values in the range [0,65535]. Data valid if (valid & PNG_INFO_hIST) |
| * is non-zero. |
| */ |
| png_uint_16p hist PNG_DEPSTRUCT; |
| #endif |
| |
| #ifdef PNG_cHRM_SUPPORTED |
| /* The cHRM chunk describes the CIE color characteristics of the monitor |
| * on which the PNG was created. This data allows the viewer to do gamut |
| * mapping of the input image to ensure that the viewer sees the same |
| * colors in the image as the creator. Values are in the range |
| * [0.0, 0.8]. Data valid if (valid & PNG_INFO_cHRM) non-zero. |
| */ |
| #ifdef PNG_FLOATING_POINT_SUPPORTED |
| float x_white PNG_DEPSTRUCT; |
| float y_white PNG_DEPSTRUCT; |
| float x_red PNG_DEPSTRUCT; |
| float y_red PNG_DEPSTRUCT; |
| float x_green PNG_DEPSTRUCT; |
| float y_green PNG_DEPSTRUCT; |
| float x_blue PNG_DEPSTRUCT; |
| float y_blue PNG_DEPSTRUCT; |
| #endif |
| #endif |
| |
| #ifdef PNG_pCAL_SUPPORTED |
| /* The pCAL chunk describes a transformation between the stored pixel |
| * values and original physical data values used to create the image. |
| * The integer range [0, 2^bit_depth - 1] maps to the floating-point |
| * range given by [pcal_X0, pcal_X1], and are further transformed by a |
| * (possibly non-linear) transformation function given by "pcal_type" |
| * and "pcal_params" into "pcal_units". Please see the PNG_EQUATION_ |
| * defines below, and the PNG-Group's PNG extensions document for a |
| * complete description of the transformations and how they should be |
| * implemented, and for a description of the ASCII parameter strings. |
| * Data values are valid if (valid & PNG_INFO_pCAL) non-zero. |
| */ |
| png_charp pcal_purpose PNG_DEPSTRUCT; /* pCAL chunk description string */ |
| png_int_32 pcal_X0 PNG_DEPSTRUCT; /* minimum value */ |
| png_int_32 pcal_X1 PNG_DEPSTRUCT; /* maximum value */ |
| png_charp pcal_units PNG_DEPSTRUCT; /* Latin-1 string giving physical |
| units */ |
| png_charpp pcal_params PNG_DEPSTRUCT; /* ASCII strings containing |
| parameter values */ |
| png_byte pcal_type PNG_DEPSTRUCT; /* equation type |
| (see PNG_EQUATION_ below) */ |
| png_byte pcal_nparams PNG_DEPSTRUCT; /* number of parameters given |
| in pcal_params */ |
| #endif |
| |
| /* New members added in libpng-1.0.6 */ |
| png_uint_32 free_me PNG_DEPSTRUCT; /* flags items libpng is |
| responsible for freeing */ |
| |
| #if defined(PNG_UNKNOWN_CHUNKS_SUPPORTED) || \ |
| defined(PNG_HANDLE_AS_UNKNOWN_SUPPORTED) |
| /* Storage for unknown chunks that the library doesn't recognize. */ |
| png_unknown_chunkp unknown_chunks PNG_DEPSTRUCT; |
| png_size_t unknown_chunks_num PNG_DEPSTRUCT; |
| #endif |
| |
| #ifdef PNG_iCCP_SUPPORTED |
| /* iCCP chunk data. */ |
| png_charp iccp_name PNG_DEPSTRUCT; /* profile name */ |
| png_charp iccp_profile PNG_DEPSTRUCT; /* International Color Consortium |
| profile data */ |
| /* Note to maintainer: should be png_bytep */ |
| png_uint_32 iccp_proflen PNG_DEPSTRUCT; /* ICC profile data length */ |
| png_byte iccp_compression PNG_DEPSTRUCT; /* Always zero */ |
| #endif |
| |
| #ifdef PNG_sPLT_SUPPORTED |
| /* Data on sPLT chunks (there may be more than one). */ |
| png_sPLT_tp splt_palettes PNG_DEPSTRUCT; |
| png_uint_32 splt_palettes_num PNG_DEPSTRUCT; |
| #endif |
| |
| #ifdef PNG_sCAL_SUPPORTED |
| /* The sCAL chunk describes the actual physical dimensions of the |
| * subject matter of the graphic. The chunk contains a unit specification |
| * a byte value, and two ASCII strings representing floating-point |
| * values. The values are width and height corresponsing to one pixel |
| * in the image. This external representation is converted to double |
| * here. Data values are valid if (valid & PNG_INFO_sCAL) is non-zero. |
| */ |
| png_byte scal_unit PNG_DEPSTRUCT; /* unit of physical scale */ |
| #ifdef PNG_FLOATING_POINT_SUPPORTED |
| double scal_pixel_width PNG_DEPSTRUCT; /* width of one pixel */ |
| double scal_pixel_height PNG_DEPSTRUCT; /* height of one pixel */ |
| #endif |
| #ifdef PNG_FIXED_POINT_SUPPORTED |
| png_charp scal_s_width PNG_DEPSTRUCT; /* string containing height */ |
| png_charp scal_s_height PNG_DEPSTRUCT; /* string containing width */ |
| #endif |
| #endif |
| |
| #ifdef PNG_INFO_IMAGE_SUPPORTED |
| /* Memory has been allocated if (valid & PNG_ALLOCATED_INFO_ROWS) |
| non-zero */ |
| /* Data valid if (valid & PNG_INFO_IDAT) non-zero */ |
| png_bytepp row_pointers PNG_DEPSTRUCT; /* the image bits */ |
| #endif |
| |
| #if defined(PNG_FIXED_POINT_SUPPORTED) && defined(PNG_gAMA_SUPPORTED) |
| png_fixed_point int_gamma PNG_DEPSTRUCT; /* gamma of image, |
| if (valid & PNG_INFO_gAMA) */ |
| #endif |
| |
| #if defined(PNG_cHRM_SUPPORTED) && defined(PNG_FIXED_POINT_SUPPORTED) |
| png_fixed_point int_x_white PNG_DEPSTRUCT; |
| png_fixed_point int_y_white PNG_DEPSTRUCT; |
| png_fixed_point int_x_red PNG_DEPSTRUCT; |
| png_fixed_point int_y_red PNG_DEPSTRUCT; |
| png_fixed_point int_x_green PNG_DEPSTRUCT; |
| png_fixed_point int_y_green PNG_DEPSTRUCT; |
| png_fixed_point int_x_blue PNG_DEPSTRUCT; |
| png_fixed_point int_y_blue PNG_DEPSTRUCT; |
| #endif |
| |
| } png_info; |
| |
| typedef png_info FAR * png_infop; |
| typedef PNG_CONST png_info FAR * png_const_infop; |
| typedef png_info FAR * FAR * png_infopp; |
| |
| /* Maximum positive integer used in PNG is (2^31)-1 */ |
| #define PNG_UINT_31_MAX ((png_uint_32)0x7fffffffL) |
| #define PNG_UINT_32_MAX ((png_uint_32)(-1)) |
| #define PNG_SIZE_MAX ((png_size_t)(-1)) |
| |
| /* These describe the color_type field in png_info. */ |
| /* color type masks */ |
| #define PNG_COLOR_MASK_PALETTE 1 |
| #define PNG_COLOR_MASK_COLOR 2 |
| #define PNG_COLOR_MASK_ALPHA 4 |
| |
| /* color types. Note that not all combinations are legal */ |
| #define PNG_COLOR_TYPE_GRAY 0 |
| #define PNG_COLOR_TYPE_PALETTE (PNG_COLOR_MASK_COLOR | PNG_COLOR_MASK_PALETTE) |
| #define PNG_COLOR_TYPE_RGB (PNG_COLOR_MASK_COLOR) |
| #define PNG_COLOR_TYPE_RGB_ALPHA (PNG_COLOR_MASK_COLOR | PNG_COLOR_MASK_ALPHA) |
| #define PNG_COLOR_TYPE_GRAY_ALPHA (PNG_COLOR_MASK_ALPHA) |
| /* aliases */ |
| #define PNG_COLOR_TYPE_RGBA PNG_COLOR_TYPE_RGB_ALPHA |
| #define PNG_COLOR_TYPE_GA PNG_COLOR_TYPE_GRAY_ALPHA |
| |
| /* This is for compression type. PNG 1.0-1.2 only define the single type. */ |
| #define PNG_COMPRESSION_TYPE_BASE 0 /* Deflate method 8, 32K window */ |
| #define PNG_COMPRESSION_TYPE_DEFAULT PNG_COMPRESSION_TYPE_BASE |
| |
| /* This is for filter type. PNG 1.0-1.2 only define the single type. */ |
| #define PNG_FILTER_TYPE_BASE 0 /* Single row per-byte filtering */ |
| #define PNG_INTRAPIXEL_DIFFERENCING 64 /* Used only in MNG datastreams */ |
| #define PNG_FILTER_TYPE_DEFAULT PNG_FILTER_TYPE_BASE |
| |
| /* These are for the interlacing type. These values should NOT be changed. */ |
| #define PNG_INTERLACE_NONE 0 /* Non-interlaced image */ |
| #define PNG_INTERLACE_ADAM7 1 /* Adam7 interlacing */ |
| #define PNG_INTERLACE_LAST 2 /* Not a valid value */ |
| |
| /* These are for the oFFs chunk. These values should NOT be changed. */ |
| #define PNG_OFFSET_PIXEL 0 /* Offset in pixels */ |
| #define PNG_OFFSET_MICROMETER 1 /* Offset in micrometers (1/10^6 meter) */ |
| #define PNG_OFFSET_LAST 2 /* Not a valid value */ |
| |
| /* These are for the pCAL chunk. These values should NOT be changed. */ |
| #define PNG_EQUATION_LINEAR 0 /* Linear transformation */ |
| #define PNG_EQUATION_BASE_E 1 /* Exponential base e transform */ |
| #define PNG_EQUATION_ARBITRARY 2 /* Arbitrary base exponential transform */ |
| #define PNG_EQUATION_HYPERBOLIC 3 /* Hyperbolic sine transformation */ |
| #define PNG_EQUATION_LAST 4 /* Not a valid value */ |
| |
| /* These are for the sCAL chunk. These values should NOT be changed. */ |
| #define PNG_SCALE_UNKNOWN 0 /* unknown unit (image scale) */ |
| #define PNG_SCALE_METER 1 /* meters per pixel */ |
| #define PNG_SCALE_RADIAN 2 /* radians per pixel */ |
| #define PNG_SCALE_LAST 3 /* Not a valid value */ |
| |
| /* These are for the pHYs chunk. These values should NOT be changed. */ |
| #define PNG_RESOLUTION_UNKNOWN 0 /* pixels/unknown unit (aspect ratio) */ |
| #define PNG_RESOLUTION_METER 1 /* pixels/meter */ |
| #define PNG_RESOLUTION_LAST 2 /* Not a valid value */ |
| |
| /* These are for the sRGB chunk. These values should NOT be changed. */ |
| #define PNG_sRGB_INTENT_PERCEPTUAL 0 |
| #define PNG_sRGB_INTENT_RELATIVE 1 |
| #define PNG_sRGB_INTENT_SATURATION 2 |
| #define PNG_sRGB_INTENT_ABSOLUTE 3 |
| #define PNG_sRGB_INTENT_LAST 4 /* Not a valid value */ |
| |
| /* This is for text chunks */ |
| #define PNG_KEYWORD_MAX_LENGTH 79 |
| |
| /* Maximum number of entries in PLTE/sPLT/tRNS arrays */ |
| #define PNG_MAX_PALETTE_LENGTH 256 |
| |
| /* These determine if an ancillary chunk's data has been successfully read |
| * from the PNG header, or if the application has filled in the corresponding |
| * data in the info_struct to be written into the output file. The values |
| * of the PNG_INFO_<chunk> defines should NOT be changed. |
| */ |
| #define PNG_INFO_gAMA 0x0001 |
| #define PNG_INFO_sBIT 0x0002 |
| #define PNG_INFO_cHRM 0x0004 |
| #define PNG_INFO_PLTE 0x0008 |
| #define PNG_INFO_tRNS 0x0010 |
| #define PNG_INFO_bKGD 0x0020 |
| #define PNG_INFO_hIST 0x0040 |
| #define PNG_INFO_pHYs 0x0080 |
| #define PNG_INFO_oFFs 0x0100 |
| #define PNG_INFO_tIME 0x0200 |
| #define PNG_INFO_pCAL 0x0400 |
| #define PNG_INFO_sRGB 0x0800 /* GR-P, 0.96a */ |
| #define PNG_INFO_iCCP 0x1000 /* ESR, 1.0.6 */ |
| #define PNG_INFO_sPLT 0x2000 /* ESR, 1.0.6 */ |
| #define PNG_INFO_sCAL 0x4000 /* ESR, 1.0.6 */ |
| #define PNG_INFO_IDAT 0x8000L /* ESR, 1.0.6 */ |
| |
| /* This is used for the transformation routines, as some of them |
| * change these values for the row. It also should enable using |
| * the routines for other purposes. |
| */ |
| typedef struct png_row_info_struct |
| { |
| png_uint_32 width; /* width of row */ |
| png_size_t rowbytes; /* number of bytes in row */ |
| png_byte color_type; /* color type of row */ |
| png_byte bit_depth; /* bit depth of row */ |
| png_byte channels; /* number of channels (1, 2, 3, or 4) */ |
| png_byte pixel_depth; /* bits per pixel (depth * channels) */ |
| } png_row_info; |
| |
| typedef png_row_info FAR * png_row_infop; |
| typedef png_row_info FAR * FAR * png_row_infopp; |
| |
| /* These are the function types for the I/O functions and for the functions |
| * that allow the user to override the default I/O functions with his or her |
| * own. The png_error_ptr type should match that of user-supplied warning |
| * and error functions, while the png_rw_ptr type should match that of the |
| * user read/write data functions. |
| */ |
| typedef struct png_struct_def png_struct; |
| typedef png_struct FAR * png_structp; |
| typedef PNG_CONST png_struct FAR * png_const_structp; |
| |
| typedef void (PNGAPI *png_error_ptr) PNGARG((png_structp, png_const_charp)); |
| typedef void (PNGAPI *png_rw_ptr) PNGARG((png_structp, png_bytep, png_size_t)); |
| typedef void (PNGAPI *png_flush_ptr) PNGARG((png_structp)); |
| typedef void (PNGAPI *png_read_status_ptr) PNGARG((png_structp, png_uint_32, |
| int)); |
| typedef void (PNGAPI *png_write_status_ptr) PNGARG((png_structp, png_uint_32, |
| int)); |
| |
| #ifdef PNG_PROGRESSIVE_READ_SUPPORTED |
| typedef void (PNGAPI *png_progressive_info_ptr) PNGARG((png_structp, |
| png_infop)); |
| typedef void (PNGAPI *png_progressive_end_ptr) PNGARG((png_structp, png_infop)); |
| typedef void (PNGAPI *png_progressive_row_ptr) PNGARG((png_structp, png_bytep, |
| png_uint_32, int)); |
| #endif |
| |
| #if defined(PNG_READ_USER_TRANSFORM_SUPPORTED) || \ |
| defined(PNG_WRITE_USER_TRANSFORM_SUPPORTED) |
| typedef void (PNGAPI *png_user_transform_ptr) PNGARG((png_structp, |
| png_row_infop, png_bytep)); |
| #endif |
| |
| #ifdef PNG_USER_CHUNKS_SUPPORTED |
| typedef int (PNGAPI *png_user_chunk_ptr) PNGARG((png_structp, |
| png_unknown_chunkp)); |
| #endif |
| #ifdef PNG_UNKNOWN_CHUNKS_SUPPORTED |
| typedef void (PNGAPI *png_unknown_chunk_ptr) PNGARG((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. |
| */ |
| typedef void (PNGAPI *png_longjmp_ptr) PNGARG((jmp_buf, int)); |
| #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 */ |
| |
| /* Flags for MNG supported features */ |
| #define PNG_FLAG_MNG_EMPTY_PLTE 0x01 |
| #define PNG_FLAG_MNG_FILTER_64 0x04 |
| #define PNG_ALL_MNG_FEATURES 0x05 |
| |
| typedef png_voidp (*png_malloc_ptr) PNGARG((png_structp, png_alloc_size_t)); |
| typedef void (*png_free_ptr) PNGARG((png_structp, png_voidp)); |
| |
| /* The structure that holds the information to read and write PNG files. |
| * The only people who need to care about what is inside of this are the |
| * people who will be modifying the library for their own special needs. |
| * It should NOT be accessed directly by an application, except to store |
| * the jmp_buf. |
| */ |
| |
| struct png_struct_def |
| { |
| #ifdef PNG_SETJMP_SUPPORTED |
| jmp_buf jmpbuf PNG_DEPSTRUCT; /* used in png_error */ |
| png_longjmp_ptr longjmp_fn PNG_DEPSTRUCT;/* setjmp non-local goto |
| function. */ |
| #endif |
| png_error_ptr error_fn PNG_DEPSTRUCT; /* function for printing |
| errors and aborting */ |
| png_error_ptr warning_fn PNG_DEPSTRUCT; /* function for printing |
| warnings */ |
| png_voidp error_ptr PNG_DEPSTRUCT; /* user supplied struct for |
| error functions */ |
| png_rw_ptr write_data_fn PNG_DEPSTRUCT; /* function for writing |
| output data */ |
| png_rw_ptr read_data_fn PNG_DEPSTRUCT; /* function for reading |
| input data */ |
| png_voidp io_ptr PNG_DEPSTRUCT; /* ptr to application struct |
| for I/O functions */ |
| |
| #ifdef PNG_READ_USER_TRANSFORM_SUPPORTED |
| png_user_transform_ptr read_user_transform_fn PNG_DEPSTRUCT; /* user read |
| transform */ |
| #endif |
| |
| #ifdef PNG_WRITE_USER_TRANSFORM_SUPPORTED |
| png_user_transform_ptr write_user_transform_fn PNG_DEPSTRUCT; /* user write |
| transform */ |
| #endif |
| |
| /* These were added in libpng-1.0.2 */ |
| #ifdef PNG_USER_TRANSFORM_PTR_SUPPORTED |
| #if defined(PNG_READ_USER_TRANSFORM_SUPPORTED) || \ |
| defined(PNG_WRITE_USER_TRANSFORM_SUPPORTED) |
| png_voidp user_transform_ptr PNG_DEPSTRUCT; /* user supplied struct |
| for user transform */ |
| png_byte user_transform_depth PNG_DEPSTRUCT; /* bit depth of user |
| transformed pixels */ |
| png_byte user_transform_channels PNG_DEPSTRUCT; /* channels in user |
| transformed pixels */ |
| #endif |
| #endif |
| |
| png_uint_32 mode PNG_DEPSTRUCT; /* tells us where we are in |
| the PNG file */ |
| png_uint_32 flags PNG_DEPSTRUCT; /* flags indicating various |
| things to libpng */ |
| png_uint_32 transformations PNG_DEPSTRUCT; /* which transformations |
| to perform */ |
| |
| z_stream zstream PNG_DEPSTRUCT; /* pointer to decompression |
| structure (below) */ |
| png_bytep zbuf PNG_DEPSTRUCT; /* buffer for zlib */ |
| png_size_t zbuf_size PNG_DEPSTRUCT; /* size of zbuf */ |
| int zlib_level PNG_DEPSTRUCT; /* holds zlib compression level */ |
| int zlib_method PNG_DEPSTRUCT; /* holds zlib compression method */ |
| int zlib_window_bits PNG_DEPSTRUCT; /* holds zlib compression window |
| bits */ |
| int zlib_mem_level PNG_DEPSTRUCT; /* holds zlib compression memory |
| level */ |
| int zlib_strategy PNG_DEPSTRUCT; /* holds zlib compression |
| strategy */ |
| |
| png_uint_32 width PNG_DEPSTRUCT; /* width of image in pixels */ |
| png_uint_32 height PNG_DEPSTRUCT; /* height of image in pixels */ |
| png_uint_32 num_rows PNG_DEPSTRUCT; /* number of rows in current pass */ |
| png_uint_32 usr_width PNG_DEPSTRUCT; /* width of row at start of write */ |
| png_size_t rowbytes PNG_DEPSTRUCT; /* size of row in bytes */ |
| #if 0 /* Replaced with the following in libpng-1.4.1 */ |
| png_size_t irowbytes PNG_DEPSTRUCT; |
| #endif |
| /* Added in libpng-1.4.1 */ |
| #ifdef PNG_USER_LIMITS_SUPPORTED |
| /* Total memory that a zTXt, sPLT, iTXt, iCCP, or unknown chunk |
| * can occupy when decompressed. 0 means unlimited. |
| * We will change the typedef from png_size_t to png_alloc_size_t |
| * in libpng-1.6.0 |
| */ |
| png_alloc_size_t user_chunk_malloc_max PNG_DEPSTRUCT; |
| #endif |
| png_uint_32 iwidth PNG_DEPSTRUCT; /* width of current interlaced |
| row in pixels */ |
| png_uint_32 row_number PNG_DEPSTRUCT; /* current row in interlace pass */ |
| png_bytep prev_row PNG_DEPSTRUCT; /* buffer to save previous |
| (unfiltered) row */ |
| png_bytep row_buf PNG_DEPSTRUCT; /* buffer to save current |
| (unfiltered) row */ |
| png_bytep sub_row PNG_DEPSTRUCT; /* buffer to save "sub" row |
| when filtering */ |
| png_bytep up_row PNG_DEPSTRUCT; /* buffer to save "up" row |
| when filtering */ |
| png_bytep avg_row PNG_DEPSTRUCT; /* buffer to save "avg" row |
| when filtering */ |
| png_bytep paeth_row PNG_DEPSTRUCT; /* buffer to save "Paeth" row |
| when filtering */ |
| png_row_info row_info PNG_DEPSTRUCT; /* used for transformation |
| routines */ |
| |
| png_uint_32 idat_size PNG_DEPSTRUCT; /* current IDAT size for read */ |
| png_uint_32 crc PNG_DEPSTRUCT; /* current chunk CRC value */ |
| png_colorp palette PNG_DEPSTRUCT; /* palette from the input file */ |
| png_uint_16 num_palette PNG_DEPSTRUCT; /* number of color entries in |
| palette */ |
| png_uint_16 num_trans PNG_DEPSTRUCT; /* number of transparency values */ |
| png_byte chunk_name[5] PNG_DEPSTRUCT; /* null-terminated name of current |
| chunk */ |
| png_byte compression PNG_DEPSTRUCT; /* file compression type |
| (always 0) */ |
| png_byte filter PNG_DEPSTRUCT; /* file filter type (always 0) */ |
| png_byte interlaced PNG_DEPSTRUCT; /* PNG_INTERLACE_NONE, |
| PNG_INTERLACE_ADAM7 */ |
| png_byte pass PNG_DEPSTRUCT; /* current interlace pass (0 - 6) */ |
| png_byte do_filter PNG_DEPSTRUCT; /* row filter flags (see |
| PNG_FILTER_ below ) */ |
| png_byte color_type PNG_DEPSTRUCT; /* color type of file */ |
| png_byte bit_depth PNG_DEPSTRUCT; /* bit depth of file */ |
| png_byte usr_bit_depth PNG_DEPSTRUCT; /* bit depth of users row */ |
| png_byte pixel_depth PNG_DEPSTRUCT; /* number of bits per pixel */ |
| png_byte channels PNG_DEPSTRUCT; /* number of channels in file */ |
| png_byte usr_channels PNG_DEPSTRUCT; /* channels at start of write */ |
| png_byte sig_bytes PNG_DEPSTRUCT; /* magic bytes read/written from |
| start of file */ |
| |
| #if defined(PNG_READ_FILLER_SUPPORTED) || defined(PNG_WRITE_FILLER_SUPPORTED) |
| png_uint_16 filler PNG_DEPSTRUCT; /* filler bytes for pixel |
| expansion */ |
| #endif |
| |
| #ifdef PNG_bKGD_SUPPORTED |
| png_byte background_gamma_type PNG_DEPSTRUCT; |
| # ifdef PNG_FLOATING_POINT_SUPPORTED |
| float background_gamma PNG_DEPSTRUCT; |
| # endif |
| png_color_16 background PNG_DEPSTRUCT; /* background color in |
| screen gamma space */ |
| #ifdef PNG_READ_GAMMA_SUPPORTED |
| png_color_16 background_1 PNG_DEPSTRUCT; /* background normalized |
| to gamma 1.0 */ |
| #endif |
| #endif /* PNG_bKGD_SUPPORTED */ |
| |
| #ifdef PNG_WRITE_FLUSH_SUPPORTED |
| png_flush_ptr output_flush_fn PNG_DEPSTRUCT; /* Function for flushing |
| output */ |
| png_uint_32 flush_dist PNG_DEPSTRUCT; /* how many rows apart to flush, |
| 0 - no flush */ |
| png_uint_32 flush_rows PNG_DEPSTRUCT; /* number of rows written since |
| last flush */ |
| #endif |
| |
| #if defined(PNG_READ_GAMMA_SUPPORTED) || defined(PNG_READ_BACKGROUND_SUPPORTED) |
| int gamma_shift PNG_DEPSTRUCT; /* number of "insignificant" bits |
| 16-bit gamma */ |
| #ifdef PNG_FLOATING_POINT_SUPPORTED |
| float gamma PNG_DEPSTRUCT; /* file gamma value */ |
| float screen_gamma PNG_DEPSTRUCT; /* screen gamma value |
| (display_exponent) */ |
| #endif |
| #endif |
| |
| #if defined(PNG_READ_GAMMA_SUPPORTED) || defined(PNG_READ_BACKGROUND_SUPPORTED) |
| png_bytep gamma_table PNG_DEPSTRUCT; /* gamma table for 8-bit |
| depth files */ |
| png_bytep gamma_from_1 PNG_DEPSTRUCT; /* converts from 1.0 to screen */ |
| png_bytep gamma_to_1 PNG_DEPSTRUCT; /* converts from file to 1.0 */ |
| png_uint_16pp gamma_16_table PNG_DEPSTRUCT; /* gamma table for 16-bit |
| depth files */ |
| png_uint_16pp gamma_16_from_1 PNG_DEPSTRUCT; /* converts from 1.0 to |
| screen */ |
| png_uint_16pp gamma_16_to_1 PNG_DEPSTRUCT; /* converts from file to 1.0 */ |
| #endif |
| |
| #if defined(PNG_READ_GAMMA_SUPPORTED) || defined(PNG_sBIT_SUPPORTED) |
| png_color_8 sig_bit PNG_DEPSTRUCT; /* significant bits in each |
| available channel */ |
| #endif |
| |
| #if defined(PNG_READ_SHIFT_SUPPORTED) || defined(PNG_WRITE_SHIFT_SUPPORTED) |
| png_color_8 shift PNG_DEPSTRUCT; /* shift for significant bit |
| tranformation */ |
| #endif |
| |
| #if defined(PNG_tRNS_SUPPORTED) || defined(PNG_READ_BACKGROUND_SUPPORTED) \ |
| || defined(PNG_READ_EXPAND_SUPPORTED) || defined(PNG_READ_BACKGROUND_SUPPORTED) |
| png_bytep trans_alpha PNG_DEPSTRUCT; /* alpha values for |
| paletted files */ |
| png_color_16 trans_color PNG_DEPSTRUCT; /* transparent color for |
| non-paletted files */ |
| #endif |
| |
| png_read_status_ptr read_row_fn PNG_DEPSTRUCT; /* called after each |
| row is decoded */ |
| png_write_status_ptr write_row_fn PNG_DEPSTRUCT; /* called after each |
| row is encoded */ |
| #ifdef PNG_PROGRESSIVE_READ_SUPPORTED |
| png_progressive_info_ptr info_fn PNG_DEPSTRUCT; /* called after header |
| data fully read */ |
| png_progressive_row_ptr row_fn PNG_DEPSTRUCT; /* called after each |
| prog. row is decoded */ |
| png_progressive_end_ptr end_fn PNG_DEPSTRUCT; /* called after image |
| is complete */ |
| png_bytep save_buffer_ptr PNG_DEPSTRUCT; /* current location in |
| save_buffer */ |
| png_bytep save_buffer PNG_DEPSTRUCT; /* buffer for previously |
| read data */ |
| png_bytep current_buffer_ptr PNG_DEPSTRUCT; /* current location in |
| current_buffer */ |
| png_bytep current_buffer PNG_DEPSTRUCT; /* buffer for recently |
| used data */ |
| png_uint_32 push_length PNG_DEPSTRUCT; /* size of current input |
| chunk */ |
| png_uint_32 skip_length PNG_DEPSTRUCT; /* bytes to skip in |
| input data */ |
| png_size_t save_buffer_size PNG_DEPSTRUCT; /* amount of data now |
| in save_buffer */ |
| png_size_t save_buffer_max PNG_DEPSTRUCT; /* total size of |
| save_buffer */ |
| png_size_t buffer_size PNG_DEPSTRUCT; /* total amount of |
| available input data */ |
| png_size_t current_buffer_size PNG_DEPSTRUCT; /* amount of data now |
| in current_buffer */ |
| int process_mode PNG_DEPSTRUCT; /* what push library |
| is currently doing */ |
| int cur_palette PNG_DEPSTRUCT; /* current push library |
| palette index */ |
| |
| # ifdef PNG_TEXT_SUPPORTED |
| png_size_t current_text_size PNG_DEPSTRUCT; /* current size of |
| text input data */ |
| png_size_t current_text_left PNG_DEPSTRUCT; /* how much text left |
| to read in input */ |
| png_charp current_text PNG_DEPSTRUCT; /* current text chunk |
| buffer */ |
| png_charp current_text_ptr PNG_DEPSTRUCT; /* current location |
| in current_text */ |
| # endif /* PNG_PROGRESSIVE_READ_SUPPORTED && PNG_TEXT_SUPPORTED */ |
| |
| #endif /* PNG_PROGRESSIVE_READ_SUPPORTED */ |
| |
| #if defined(__TURBOC__) && !defined(_Windows) && !defined(__FLAT__) |
| /* For the Borland special 64K segment handler */ |
| png_bytepp offset_table_ptr PNG_DEPSTRUCT; |
| png_bytep offset_table PNG_DEPSTRUCT; |
| png_uint_16 offset_table_number PNG_DEPSTRUCT; |
| png_uint_16 offset_table_count PNG_DEPSTRUCT; |
| png_uint_16 offset_table_count_free PNG_DEPSTRUCT; |
| #endif |
| |
| #ifdef PNG_READ_QUANTIZE_SUPPORTED |
| png_bytep palette_lookup PNG_DEPSTRUCT; /* lookup table for quantizing */ |
| png_bytep quantize_index PNG_DEPSTRUCT; /* index translation for palette |
| files */ |
| #endif |
| |
| #if defined(PNG_READ_QUANTIZE_SUPPORTED) || defined(PNG_hIST_SUPPORTED) |
| png_uint_16p hist PNG_DEPSTRUCT; /* histogram */ |
| #endif |
| |
| #ifdef PNG_WRITE_WEIGHTED_FILTER_SUPPORTED |
| png_byte heuristic_method PNG_DEPSTRUCT; /* heuristic for row |
| filter selection */ |
| png_byte num_prev_filters PNG_DEPSTRUCT; /* number of weights |
| for previous rows */ |
| png_bytep prev_filters PNG_DEPSTRUCT; /* filter type(s) of |
| previous row(s) */ |
| png_uint_16p filter_weights PNG_DEPSTRUCT; /* weight(s) for previous |
| line(s) */ |
| png_uint_16p inv_filter_weights PNG_DEPSTRUCT; /* 1/weight(s) for |
| previous line(s) */ |
| png_uint_16p filter_costs PNG_DEPSTRUCT; /* relative filter |
| calculation cost */ |
| png_uint_16p inv_filter_costs PNG_DEPSTRUCT; /* 1/relative filter |
| calculation cost */ |
| #endif |
| |
| #ifdef PNG_TIME_RFC1123_SUPPORTED |
| png_charp time_buffer PNG_DEPSTRUCT; /* String to hold RFC 1123 time text */ |
| #endif |
| |
| /* New members added in libpng-1.0.6 */ |
| |
| png_uint_32 free_me PNG_DEPSTRUCT; /* flags items libpng is |
| responsible for freeing */ |
| |
| #ifdef PNG_USER_CHUNKS_SUPPORTED |
| png_voidp user_chunk_ptr PNG_DEPSTRUCT; |
| png_user_chunk_ptr read_user_chunk_fn PNG_DEPSTRUCT; /* user read |
| chunk handler */ |
| #endif |
| |
| #ifdef PNG_HANDLE_AS_UNKNOWN_SUPPORTED |
| int num_chunk_list PNG_DEPSTRUCT; |
| png_bytep chunk_list PNG_DEPSTRUCT; |
| #endif |
| |
| /* New members added in libpng-1.0.3 */ |
| #ifdef PNG_READ_RGB_TO_GRAY_SUPPORTED |
| png_byte rgb_to_gray_status PNG_DEPSTRUCT; |
| /* These were changed from png_byte in libpng-1.0.6 */ |
| png_uint_16 rgb_to_gray_red_coeff PNG_DEPSTRUCT; |
| png_uint_16 rgb_to_gray_green_coeff PNG_DEPSTRUCT; |
| png_uint_16 rgb_to_gray_blue_coeff PNG_DEPSTRUCT; |
| #endif |
| |
| /* New member added in libpng-1.0.4 (renamed in 1.0.9) */ |
| #if defined(PNG_MNG_FEATURES_SUPPORTED) || \ |
| defined(PNG_READ_EMPTY_PLTE_SUPPORTED) || \ |
| defined(PNG_WRITE_EMPTY_PLTE_SUPPORTED) |
| /* Changed from png_byte to png_uint_32 at version 1.2.0 */ |
| png_uint_32 mng_features_permitted PNG_DEPSTRUCT; |
| #endif |
| |
| /* New member added in libpng-1.0.7 */ |
| #if defined(PNG_READ_GAMMA_SUPPORTED) || defined(PNG_READ_BACKGROUND_SUPPORTED) |
| png_fixed_point int_gamma PNG_DEPSTRUCT; |
| #endif |
| |
| /* New member added in libpng-1.0.9, ifdef'ed out in 1.0.12, enabled in 1.2.0 */ |
| #ifdef PNG_MNG_FEATURES_SUPPORTED |
| png_byte filter_type PNG_DEPSTRUCT; |
| #endif |
| |
| /* New members added in libpng-1.2.0 */ |
| |
| /* New members added in libpng-1.0.2 but first enabled by default in 1.2.0 */ |
| #ifdef PNG_USER_MEM_SUPPORTED |
| png_voidp mem_ptr PNG_DEPSTRUCT; /* user supplied struct for |
| mem functions */ |
| png_malloc_ptr malloc_fn PNG_DEPSTRUCT; /* function for |
| allocating memory */ |
| png_free_ptr free_fn PNG_DEPSTRUCT; /* function for |
| freeing memory */ |
| #endif |
| |
| /* New member added in libpng-1.0.13 and 1.2.0 */ |
| png_bytep big_row_buf PNG_DEPSTRUCT; /* buffer to save current |
| (unfiltered) row */ |
| |
| #ifdef PNG_READ_QUANTIZE_SUPPORTED |
| /* The following three members were added at version 1.0.14 and 1.2.4 */ |
| png_bytep quantize_sort PNG_DEPSTRUCT; /* working sort array */ |
| png_bytep index_to_palette PNG_DEPSTRUCT; /* where the original |
| index currently is |
| in the palette */ |
| png_bytep palette_to_index PNG_DEPSTRUCT; /* which original index |
| points to this |
| palette color */ |
| #endif |
| |
| /* New members added in libpng-1.0.16 and 1.2.6 */ |
| png_byte compression_type PNG_DEPSTRUCT; |
| |
| #ifdef PNG_USER_LIMITS_SUPPORTED |
| png_uint_32 user_width_max PNG_DEPSTRUCT; |
| png_uint_32 user_height_max PNG_DEPSTRUCT; |
| /* Added in libpng-1.4.0: Total number of sPLT, text, and unknown |
| * chunks that can be stored (0 means unlimited). |
| */ |
| png_uint_32 user_chunk_cache_max PNG_DEPSTRUCT; |
| #endif |
| |
| /* New member added in libpng-1.0.25 and 1.2.17 */ |
| #ifdef PNG_UNKNOWN_CHUNKS_SUPPORTED |
| /* Storage for unknown chunk that the library doesn't recognize. */ |
| png_unknown_chunk unknown_chunk PNG_DEPSTRUCT; |
| #endif |
| |
| /* New members added in libpng-1.2.26 */ |
| png_uint_32 old_big_row_buf_size PNG_DEPSTRUCT; |
| png_uint_32 old_prev_row_size PNG_DEPSTRUCT; |
| |
| /* New member added in libpng-1.2.30 */ |
| png_charp chunkdata PNG_DEPSTRUCT; /* buffer for reading chunk data */ |
| |
| #ifdef PNG_IO_STATE_SUPPORTED |
| /* New member added in libpng-1.4.0 */ |
| png_uint_32 io_state PNG_DEPSTRUCT; |
| #endif |
| }; |
| |
| |
| /* This triggers a compiler error in png.c, if png.c and png.h |
| * do not agree upon the version number. |
| */ |
| typedef png_structp version_1_4_12; |
| |
| typedef png_struct FAR * FAR * png_structpp; |
| |
| /* Here are the function definitions most commonly used. This is not |
| * the place to find out how to use libpng. See libpng.txt for the |
| * full explanation, see example.c for the summary. This just provides |
| * a simple one line description of the use of each function. |
| */ |
| |
| /* Returns the version number of the library */ |
| PNG_EXPORT(png_uint_32,png_access_version_number) PNGARG((void)); |
| |
| /* Tell lib we have already handled the first <num_bytes> magic bytes. |
| * Handling more than 8 bytes from the beginning of the file is an error. |
| */ |
| PNG_EXPORT(void,png_set_sig_bytes) PNGARG((png_structp png_ptr, |
| int num_bytes)); |
| |
| /* Check sig[start] through sig[start + num_to_check - 1] to see if it's a |
| * PNG file. Returns zero if the supplied bytes match the 8-byte PNG |
| * signature, and non-zero otherwise. Having num_to_check == 0 or |
| * start > 7 will always fail (ie return non-zero). |
| */ |
| PNG_EXPORT(int,png_sig_cmp) PNGARG((png_bytep sig, png_size_t start, |
| png_size_t num_to_check)); |
| |
| /* Simple signature checking function. This is the same as calling |
| * png_check_sig(sig, n) := !png_sig_cmp(sig, 0, n). |
| */ |
| #define png_check_sig(sig,n) !png_sig_cmp((sig), 0, (n)) |
| |
| /* Allocate and initialize png_ptr struct for reading, and any other memory. */ |
| PNG_EXPORT(png_structp,png_create_read_struct) |
| PNGARG((png_const_charp user_png_ver, png_voidp error_ptr, |
| png_error_ptr error_fn, png_error_ptr warn_fn)) PNG_ALLOCATED; |
| |
| /* Allocate and initialize png_ptr struct for writing, and any other memory */ |
| PNG_EXPORT(png_structp,png_create_write_struct) |
| PNGARG((png_const_charp user_png_ver, png_voidp error_ptr, |
| png_error_ptr error_fn, png_error_ptr warn_fn)) PNG_ALLOCATED; |
| |
| PNG_EXPORT(png_size_t,png_get_compression_buffer_size) |
| PNGARG((png_const_structp png_ptr)); |
| |
| PNG_EXPORT(void,png_set_compression_buffer_size) |
| PNGARG((png_structp 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(jmp_buf*, png_set_longjmp_fn) |
| PNGARG((png_structp 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 |
| |
| #ifdef PNG_READ_SUPPORTED |
| /* Reset the compression stream */ |
| PNG_EXPORT(int,png_reset_zstream) PNGARG((png_structp 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_EXPORT(png_structp,png_create_read_struct_2) |
| PNGARG((png_const_charp user_png_ver, png_voidp error_ptr, |
| png_error_ptr error_fn, png_error_ptr warn_fn, png_voidp mem_ptr, |
| png_malloc_ptr malloc_fn, png_free_ptr free_fn)) PNG_ALLOCATED; |
| PNG_EXPORT(png_structp,png_create_write_struct_2) |
| PNGARG((png_const_charp user_png_ver, png_voidp error_ptr, |
| png_error_ptr error_fn, png_error_ptr warn_fn, png_voidp mem_ptr, |
| png_malloc_ptr malloc_fn, png_free_ptr free_fn)) PNG_ALLOCATED; |
| #endif |
| |
| /* Write the PNG file signature. */ |
| PNG_EXPORT(void,png_write_sig) PNGARG((png_structp png_ptr)); |
| |
| /* Write a PNG chunk - size, type, (optional) data, CRC. */ |
| PNG_EXPORT(void,png_write_chunk) PNGARG((png_structp png_ptr, |
| png_bytep chunk_name, png_bytep data, png_size_t length)); |
| |
| /* Write the start of a PNG chunk - length and chunk name. */ |
| PNG_EXPORT(void,png_write_chunk_start) PNGARG((png_structp png_ptr, |
| png_bytep chunk_name, png_uint_32 length)); |
| |
| /* Write the data of a PNG chunk started with png_write_chunk_start(). */ |
| PNG_EXPORT(void,png_write_chunk_data) PNGARG((png_structp png_ptr, |
| png_bytep data, png_size_t length)); |
| |
| /* Finish a chunk started with png_write_chunk_start() (includes CRC). */ |
| PNG_EXPORT(void,png_write_chunk_end) PNGARG((png_structp png_ptr)); |
| |
| /* Allocate and initialize the info structure */ |
| PNG_EXPORT(png_infop,png_create_info_struct) |
| PNGARG((png_structp png_ptr)) PNG_ALLOCATED; |
| |
| PNG_EXPORT(void,png_info_init_3) PNGARG((png_infopp info_ptr, |
| png_size_t png_info_struct_size)); |
| |
| /* Writes all the PNG information before the image. */ |
| PNG_EXPORT(void,png_write_info_before_PLTE) PNGARG((png_structp png_ptr, |
| png_infop info_ptr)); |
| PNG_EXPORT(void,png_write_info) PNGARG((png_structp png_ptr, |
| png_infop info_ptr)); |
| |
| #ifdef PNG_SEQUENTIAL_READ_SUPPORTED |
| /* Read the information before the actual image data. */ |
| PNG_EXPORT(void,png_read_info) PNGARG((png_structp png_ptr, |
| png_infop info_ptr)); |
| #endif |
| |
| #ifdef PNG_TIME_RFC1123_SUPPORTED |
| PNG_EXPORT(png_charp,png_convert_to_rfc1123) |
| PNGARG((png_structp png_ptr, png_timep ptime)); |
| #endif |
| |
| #ifdef PNG_CONVERT_tIME_SUPPORTED |
| /* Convert from a struct tm to png_time */ |
| PNG_EXPORT(void,png_convert_from_struct_tm) PNGARG((png_timep ptime, |
| struct tm FAR * ttime)); |
| |
| /* Convert from time_t to png_time. Uses gmtime() */ |
| PNG_EXPORT(void,png_convert_from_time_t) PNGARG((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(void,png_set_expand) PNGARG((png_structp png_ptr)); |
| PNG_EXPORT(void,png_set_expand_gray_1_2_4_to_8) PNGARG((png_structp |
| png_ptr)); |
| PNG_EXPORT(void,png_set_palette_to_rgb) PNGARG((png_structp png_ptr)); |
| PNG_EXPORT(void,png_set_tRNS_to_alpha) PNGARG((png_structp png_ptr)); |
| #endif |
| |
| #if defined(PNG_READ_BGR_SUPPORTED) || defined(PNG_WRITE_BGR_SUPPORTED) |
| /* Use blue, green, red order for pixels. */ |
| PNG_EXPORT(void,png_set_bgr) PNGARG((png_structp png_ptr)); |
| #endif |
| |
| #ifdef PNG_READ_GRAY_TO_RGB_SUPPORTED |
| /* Expand the grayscale to 24-bit RGB if necessary. */ |
| PNG_EXPORT(void,png_set_gray_to_rgb) PNGARG((png_structp png_ptr)); |
| #endif |
| |
| #ifdef PNG_READ_RGB_TO_GRAY_SUPPORTED |
| /* Reduce RGB to grayscale. */ |
| #ifdef PNG_FLOATING_POINT_SUPPORTED |
| PNG_EXPORT(void,png_set_rgb_to_gray) PNGARG((png_structp png_ptr, |
| int error_action, double red, double green )); |
| #endif |
| PNG_EXPORT(void,png_set_rgb_to_gray_fixed) PNGARG((png_structp png_ptr, |
| int error_action, png_fixed_point red, png_fixed_point green )); |
| PNG_EXPORT(png_byte,png_get_rgb_to_gray_status) PNGARG((png_const_structp |
| png_ptr)); |
| #endif |
| |
| PNG_EXPORT(void,png_build_grayscale_palette) PNGARG((int bit_depth, |
| png_colorp palette)); |
| |
| #ifdef PNG_READ_STRIP_ALPHA_SUPPORTED |
| PNG_EXPORT(void,png_set_strip_alpha) PNGARG((png_structp png_ptr)); |
| #endif |
| |
| #if defined(PNG_READ_SWAP_ALPHA_SUPPORTED) || \ |
| defined(PNG_WRITE_SWAP_ALPHA_SUPPORTED) |
| PNG_EXPORT(void,png_set_swap_alpha) PNGARG((png_structp png_ptr)); |
| #endif |
| |
| #if defined(PNG_READ_INVERT_ALPHA_SUPPORTED) || \ |
| defined(PNG_WRITE_INVERT_ALPHA_SUPPORTED) |
| PNG_EXPORT(void,png_set_invert_alpha) PNGARG((png_structp png_ptr)); |
| #endif |
| |
| #if defined(PNG_READ_FILLER_SUPPORTED) || defined(PNG_WRITE_FILLER_SUPPORTED) |
| /* Add a filler byte to 8-bit Gray or 24-bit RGB images. */ |
| PNG_EXPORT(void,png_set_filler) PNGARG((png_structp png_ptr, |
| png_uint_32 filler, int flags)); |
| /* The values of the PNG_FILLER_ defines should NOT be changed */ |
| #define PNG_FILLER_BEFORE 0 |
| #define PNG_FILLER_AFTER 1 |
| /* Add an alpha byte to 8-bit Gray or 24-bit RGB images. */ |
| PNG_EXPORT(void,png_set_add_alpha) PNGARG((png_structp png_ptr, |
| png_uint_32 filler, int flags)); |
| #endif /* PNG_READ_FILLER_SUPPORTED || PNG_WRITE_FILLER_SUPPORTED */ |
| |
| #if defined(PNG_READ_SWAP_SUPPORTED) || defined(PNG_WRITE_SWAP_SUPPORTED) |
| /* Swap bytes in 16-bit depth files. */ |
| PNG_EXPORT(void,png_set_swap) PNGARG((png_structp png_ptr)); |
| #endif |
| |
| #if defined(PNG_READ_PACK_SUPPORTED) || defined(PNG_WRITE_PACK_SUPPORTED) |
| /* Use 1 byte per pixel in 1, 2, or 4-bit depth files. */ |
| PNG_EXPORT(void,png_set_packing) PNGARG((png_structp png_ptr)); |
| #endif |
| |
| #if defined(PNG_READ_PACKSWAP_SUPPORTED) || \ |
| defined(PNG_WRITE_PACKSWAP_SUPPORTED) |
| /* Swap packing order of pixels in bytes. */ |
| PNG_EXPORT(void,png_set_packswap) PNGARG((png_structp png_ptr)); |
| #endif |
| |
| #if defined(PNG_READ_SHIFT_SUPPORTED) || defined(PNG_WRITE_SHIFT_SUPPORTED) |
| /* Converts files to legal bit depths. */ |
| PNG_EXPORT(void,png_set_shift) PNGARG((png_structp png_ptr, |
| png_color_8p true_bits)); |
| #endif |
| |
| #if defined(PNG_READ_INTERLACING_SUPPORTED) || \ |
| defined(PNG_WRITE_INTERLACING_SUPPORTED) |
| /* Have the code handle the interlacing. Returns the number of passes. */ |
| PNG_EXPORT(int,png_set_interlace_handling) PNGARG((png_structp png_ptr)); |
| #endif |
| |
| #if defined(PNG_READ_INVERT_SUPPORTED) || defined(PNG_WRITE_INVERT_SUPPORTED) |
| /* Invert monochrome files */ |
| PNG_EXPORT(void,png_set_invert_mono) PNGARG((png_structp png_ptr)); |
| #endif |
| |
| #ifdef PNG_READ_BACKGROUND_SUPPORTED |
| /* Handle alpha and tRNS by replacing with a background color. */ |
| #ifdef PNG_FLOATING_POINT_SUPPORTED |
| PNG_EXPORT(void,png_set_background) PNGARG((png_structp png_ptr, |
| png_color_16p background_color, int background_gamma_code, |
| int need_expand, double background_gamma)); |
| #endif |
| #define PNG_BACKGROUND_GAMMA_UNKNOWN 0 |
| #define PNG_BACKGROUND_GAMMA_SCREEN 1 |
| #define PNG_BACKGROUND_GAMMA_FILE 2 |
| #define PNG_BACKGROUND_GAMMA_UNIQUE 3 |
| #endif |
| |
| #ifdef PNG_READ_16_TO_8_SUPPORTED |
| /* Strip the second byte of information from a 16-bit depth file. */ |
| PNG_EXPORT(void,png_set_strip_16) PNGARG((png_structp png_ptr)); |
| #endif |
| |
| #ifdef PNG_READ_QUANTIZE_SUPPORTED |
| /* Turn on quantizing, and reduce the palette to the number of colors |
| * available. Prior to libpng-1.4.2, this was png_set_dither(). |
| */ |
| PNG_EXPORT(void,png_set_quantize) PNGARG((png_structp png_ptr, |
| png_colorp palette, int num_palette, int maximum_colors, |
| png_uint_16p histogram, int full_quantize)); |
| #endif |
| /* This migration aid will be removed from libpng-1.5.0 */ |
| #define png_set_dither png_set_quantize |
| |
| #ifdef PNG_READ_GAMMA_SUPPORTED |
| /* Handle gamma correction. Screen_gamma=(display_exponent) */ |
| #ifdef PNG_FLOATING_POINT_SUPPORTED |
| PNG_EXPORT(void,png_set_gamma) PNGARG((png_structp png_ptr, |
| double screen_gamma, double default_file_gamma)); |
| #endif |
| #endif |
| |
| |
| #ifdef PNG_WRITE_FLUSH_SUPPORTED |
| /* Set how many lines between output flushes - 0 for no flushing */ |
| PNG_EXPORT(void,png_set_flush) PNGARG((png_structp png_ptr, int nrows)); |
| /* Flush the current PNG output buffer */ |
| PNG_EXPORT(void,png_write_flush) PNGARG((png_structp png_ptr)); |
| #endif |
| |
| /* Optional update palette with requested transformations */ |
| PNG_EXPORT(void,png_start_read_image) PNGARG((png_structp png_ptr)); |
| |
| /* Optional call to update the users info structure */ |
| PNG_EXPORT(void,png_read_update_info) PNGARG((png_structp png_ptr, |
| png_infop info_ptr)); |
| |
| #ifdef PNG_SEQUENTIAL_READ_SUPPORTED |
| /* Read one or more rows of image data. */ |
| PNG_EXPORT(void,png_read_rows) PNGARG((png_structp 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(void,png_read_row) PNGARG((png_structp 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(void,png_read_image) PNGARG((png_structp png_ptr, |
| png_bytepp image)); |
| #endif |
| |
| /* Write a row of image data */ |
| PNG_EXPORT(void,png_write_row) PNGARG((png_structp png_ptr, |
| png_bytep row)); |
| |
| /* Write a few rows of image data */ |
| PNG_EXPORT(void,png_write_rows) PNGARG((png_structp png_ptr, |
| png_bytepp row, png_uint_32 num_rows)); |
| |
| /* Write the image data */ |
| PNG_EXPORT(void,png_write_image) PNGARG((png_structp png_ptr, |
| png_bytepp image)); |
| |
| /* Write the end of the PNG file. */ |
| PNG_EXPORT(void,png_write_end) PNGARG((png_structp png_ptr, |
| png_infop info_ptr)); |
| |
| #ifdef PNG_SEQUENTIAL_READ_SUPPORTED |
| /* Read the end of the PNG file. */ |
| PNG_EXPORT(void,png_read_end) PNGARG((png_structp png_ptr, |
| png_infop info_ptr)); |
| #endif |
| |
| /* Free any memory associated with the png_info_struct */ |
| PNG_EXPORT(void,png_destroy_info_struct) PNGARG((png_structp png_ptr, |
| png_infopp info_ptr_ptr)); |
| |
| /* Free any memory associated with the png_struct and the png_info_structs */ |
| PNG_EXPORT(void,png_destroy_read_struct) PNGARG((png_structpp |
| png_ptr_ptr, png_infopp info_ptr_ptr, png_infopp end_info_ptr_ptr)); |
| |
| /* Free any memory associated with the png_struct and the png_info_structs */ |
| PNG_EXPORT(void,png_destroy_write_struct) |
| PNGARG((png_structpp png_ptr_ptr, png_infopp info_ptr_ptr)); |
| |
| /* Set the libpng method of handling chunk CRC errors */ |
| PNG_EXPORT(void,png_set_crc_action) PNGARG((png_structp png_ptr, |
| int crit_action, int ancil_action)); |
| |
| /* Values for png_set_crc_action() to say how to handle CRC errors in |
| * ancillary and critical chunks, and whether to use the data contained |
| * therein. Note that it is impossible to "discard" data in a critical |
| * chunk. For versions prior to 0.90, the action was always error/quit, |
| * whereas in version 0.90 and later, the action for CRC errors in ancillary |
| * chunks is warn/discard. These values should NOT be changed. |
| * |
| * value action:critical action:ancillary |
| */ |
| #define PNG_CRC_DEFAULT 0 /* error/quit warn/discard data */ |
| #define PNG_CRC_ERROR_QUIT 1 /* error/quit error/quit */ |
| #define PNG_CRC_WARN_DISCARD 2 /* (INVALID) warn/discard data */ |
| #define PNG_CRC_WARN_USE 3 /* warn/use data warn/use data */ |
| #define PNG_CRC_QUIET_USE 4 /* quiet/use data quiet/use data */ |
| #define PNG_CRC_NO_CHANGE 5 /* use current value use current value */ |
| |
| /* These functions give the user control over the scan-line filtering in |
| * libpng and the compression methods used by zlib. These functions are |
| * mainly useful for testing, as the defaults should work with most users. |
| * Those users who are tight on memory or want faster performance at the |
| * expense of compression can modify them. See the compression library |
| * header file (zlib.h) for an explination of the compression functions. |
| */ |
| |
| /* Set the filtering method(s) used by libpng. Currently, the only valid |
| * value for "method" is 0. |
| */ |
| PNG_EXPORT(void,png_set_filter) PNGARG((png_structp png_ptr, int method, |
| int filters)); |
| |
| /* Flags for png_set_filter() to say which filters to use. The flags |
| * are chosen so that they don't conflict with real filter types |
| * below, in case they are supplied instead of the #defined constants. |
| * These values should NOT be changed. |
| */ |
| #define PNG_NO_FILTERS 0x00 |
| #define PNG_FILTER_NONE 0x08 |
| #define PNG_FILTER_SUB 0x10 |
| #define PNG_FILTER_UP 0x20 |
| #define PNG_FILTER_AVG 0x40 |
| #define PNG_FILTER_PAETH 0x80 |
| #define PNG_ALL_FILTERS (PNG_FILTER_NONE | PNG_FILTER_SUB | PNG_FILTER_UP | \ |
| PNG_FILTER_AVG | PNG_FILTER_PAETH) |
| |
| /* Filter values (not flags) - used in pngwrite.c, pngwutil.c for now. |
| * These defines should NOT be changed. |
| */ |
| #define PNG_FILTER_VALUE_NONE 0 |
| #define PNG_FILTER_VALUE_SUB 1 |
| #define PNG_FILTER_VALUE_UP 2 |
| #define PNG_FILTER_VALUE_AVG 3 |
| #define PNG_FILTER_VALUE_PAETH 4 |
| #define PNG_FILTER_VALUE_LAST 5 |
| |
| #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. |
| */ |
| #ifdef PNG_FLOATING_POINT_SUPPORTED |
| PNG_EXPORT(void,png_set_filter_heuristics) PNGARG((png_structp png_ptr, |
| int heuristic_method, int num_weights, png_doublep filter_weights, |
| png_doublep filter_costs)); |
| #endif |
| #endif /* PNG_WRITE_WEIGHTED_FILTER_SUPPORTED */ |
| |
| /* Heuristic used for row filter selection. These defines should NOT be |
| * changed. |
| */ |
| #define PNG_FILTER_HEURISTIC_DEFAULT 0 /* Currently "UNWEIGHTED" */ |
| #define PNG_FILTER_HEURISTIC_UNWEIGHTED 1 /* Used by libpng < 0.95 */ |
| #define PNG_FILTER_HEURISTIC_WEIGHTED 2 /* Experimental feature */ |
| #define PNG_FILTER_HEURISTIC_LAST 3 /* Not a valid value */ |
| |
| /* Set the library compression level. Currently, valid values range from |
| * 0 - 9, corresponding directly to the zlib compression levels 0 - 9 |
| * (0 - no compression, 9 - "maximal" compression). Note that tests have |
| * shown that zlib compression levels 3-6 usually perform as well as level 9 |
| * for PNG images, and do considerably fewer caclulations. In the future, |
| * these values may not correspond directly to the zlib compression levels. |
| */ |
| PNG_EXPORT(void,png_set_compression_level) PNGARG((png_structp png_ptr, |
| int level)); |
| |
| PNG_EXPORT(void,png_set_compression_mem_level) |
| PNGARG((png_structp png_ptr, int mem_level)); |
| |
| PNG_EXPORT(void,png_set_compression_strategy) |
| PNGARG((png_structp png_ptr, int strategy)); |
| |
| PNG_EXPORT(void,png_set_compression_window_bits) |
| PNGARG((png_structp png_ptr, int window_bits)); |
| |
| PNG_EXPORT(void,png_set_compression_method) PNGARG((png_structp png_ptr, |
| int method)); |
| |
| /* These next functions are called for input/output, memory, and error |
| * handling. They are in the file pngrio.c, pngwio.c, and pngerror.c, |
| * and call standard C I/O routines such as fread(), fwrite(), and |
| * fprintf(). These functions can be made to use other I/O routines |
| * at run time for those applications that need to handle I/O in a |
| * different manner by calling png_set_???_fn(). See libpng.txt for |
| * more information. |
| */ |
| |
| #ifdef PNG_STDIO_SUPPORTED |
| /* Initialize the input/output for the PNG file to the default functions. */ |
| PNG_EXPORT(void,png_init_io) PNGARG((png_structp png_ptr, |
| png_FILE_p fp)); |
| #endif |
| |
| /* Replace the (error and abort), and warning functions with user |
| * supplied functions. If no messages are to be printed you must still |
| * write and use replacement functions. The replacement error_fn should |
| * still do a longjmp to the last setjmp location if you are using this |
| * method of error handling. If error_fn or warning_fn is NULL, the |
| * default function will be used. |
| */ |
| |
| PNG_EXPORT(void,png_set_error_fn) PNGARG((png_structp png_ptr, |
| png_voidp error_ptr, png_error_ptr error_fn, png_error_ptr warning_fn)); |
| |
| /* Return the user pointer associated with the error functions */ |
| PNG_EXPORT(png_voidp,png_get_error_ptr) PNGARG((png_const_structp png_ptr)); |
| |
| /* Replace the default data output functions with a user supplied one(s). |
| * If buffered output is not used, then output_flush_fn can be set to NULL. |
| * If PNG_WRITE_FLUSH_SUPPORTED is not defined at libpng compile time |
| * output_flush_fn will be ignored (and thus can be NULL). |
| * 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(void,png_set_write_fn) PNGARG((png_structp png_ptr, |
| png_voidp io_ptr, png_rw_ptr write_data_fn, png_flush_ptr output_flush_fn)); |
| |
| /* Replace the default data input function with a user supplied one. */ |
| PNG_EXPORT(void,png_set_read_fn) PNGARG((png_structp png_ptr, |
| png_voidp io_ptr, png_rw_ptr read_data_fn)); |
| |
| /* Return the user pointer associated with the I/O functions */ |
| PNG_EXPORT(png_voidp,png_get_io_ptr) PNGARG((png_structp png_ptr)); |
| |
| PNG_EXPORT(void,png_set_read_status_fn) PNGARG((png_structp png_ptr, |
| png_read_status_ptr read_row_fn)); |
| |
| PNG_EXPORT(void,png_set_write_status_fn) PNGARG((png_structp png_ptr, |
| png_write_status_ptr write_row_fn)); |
| |
| #ifdef PNG_USER_MEM_SUPPORTED |
| /* Replace the default memory allocation functions with user supplied one(s). */ |
| PNG_EXPORT(void,png_set_mem_fn) PNGARG((png_structp png_ptr, |
| png_voidp mem_ptr, png_malloc_ptr malloc_fn, png_free_ptr free_fn)); |
| /* Return the user pointer associated with the memory functions */ |
| PNG_EXPORT(png_voidp,png_get_mem_ptr) PNGARG((png_const_structp png_ptr)); |
| #endif |
| |
| #ifdef PNG_READ_USER_TRANSFORM_SUPPORTED |
| PNG_EXPORT(void,png_set_read_user_transform_fn) PNGARG((png_structp |
| png_ptr, png_user_transform_ptr read_user_transform_fn)); |
| #endif |
| |
| #ifdef PNG_WRITE_USER_TRANSFORM_SUPPORTED |
| PNG_EXPORT(void,png_set_write_user_transform_fn) PNGARG((png_structp |
| png_ptr, png_user_transform_ptr write_user_transform_fn)); |
| #endif |
| |
| #if defined(PNG_READ_USER_TRANSFORM_SUPPORTED) || \ |
| defined(PNG_WRITE_USER_TRANSFORM_SUPPORTED) |
| PNG_EXPORT(void,png_set_user_transform_info) PNGARG((png_structp |
| png_ptr, png_voidp user_transform_ptr, int user_transform_depth, |
| int user_transform_channels)); |
| /* Return the user pointer associated with the user transform functions */ |
| PNG_EXPORT(png_voidp,png_get_user_transform_ptr) |
| PNGARG((png_const_structp png_ptr)); |
| #endif |
| |
| #ifdef PNG_USER_CHUNKS_SUPPORTED |
| PNG_EXPORT(void,png_set_read_user_chunk_fn) PNGARG((png_structp png_ptr, |
| png_voidp user_chunk_ptr, png_user_chunk_ptr read_user_chunk_fn)); |
| PNG_EXPORT(png_voidp,png_get_user_chunk_ptr) PNGARG((png_const_structp |
| png_ptr)); |
| #endif |
| |
| #ifdef PNG_PROGRESSIVE_READ_SUPPORTED |
| /* Sets the function callbacks for the push reader, and a pointer to a |
| * user-defined structure available to the callback functions. |
| */ |
| PNG_EXPORT(void,png_set_progressive_read_fn) PNGARG((png_structp png_ptr, |
| png_voidp progressive_ptr, |
| png_progressive_info_ptr info_fn, png_progressive_row_ptr row_fn, |
| png_progressive_end_ptr end_fn)); |
| |
| /* Returns the user pointer associated with the push read functions */ |
| PNG_EXPORT(png_voidp,png_get_progressive_ptr) |
| PNGARG((png_const_structp png_ptr)); |
| |
| /* Function to be called when data becomes available */ |
| PNG_EXPORT(void,png_process_data) PNGARG((png_structp png_ptr, |
| png_infop info_ptr, png_bytep buffer, png_size_t buffer_size)); |
| |
| /* Function that combines rows. Not very much different than the |
| * png_combine_row() call. Is this even used????? |
| */ |
| PNG_EXPORT(void,png_progressive_combine_row) PNGARG((png_structp png_ptr, |
| png_bytep old_row, png_bytep new_row)); |
| #endif /* PNG_PROGRESSIVE_READ_SUPPORTED */ |
| |
| PNG_EXPORT(png_voidp,png_malloc) PNGARG((png_structp png_ptr, |
| png_alloc_size_t size)) PNG_ALLOCATED; |
| /* Added at libpng version 1.4.0 */ |
| PNG_EXPORT(png_voidp,png_calloc) PNGARG((png_structp png_ptr, |
| png_alloc_size_t size)) PNG_ALLOCATED; |
| |
| /* Added at libpng version 1.2.4 */ |
| PNG_EXPORT(png_voidp,png_malloc_warn) PNGARG((png_structp png_ptr, |
| png_alloc_size_t size)) PNG_ALLOCATED; |
| |
| /* Frees a pointer allocated by png_malloc() */ |
| PNG_EXPORT(void,png_free) PNGARG((png_structp png_ptr, png_voidp ptr)); |
| |
| /* Free data that was allocated internally */ |
| PNG_EXPORT(void,png_free_data) PNGARG((png_structp png_ptr, |
| png_infop info_ptr, png_uint_32 free_me, int num)); |
| /* Reassign responsibility for freeing existing data, whether allocated |
| * by libpng or by the application */ |
| PNG_EXPORT(void,png_data_freer) PNGARG((png_structp png_ptr, |
| png_infop 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_EXPORT(png_voidp,png_malloc_default) PNGARG((png_structp png_ptr, |
| png_alloc_size_t size)) PNG_ALLOCATED; |
| PNG_EXPORT(void,png_free_default) PNGARG((png_structp png_ptr, |
| png_voidp ptr)); |
| #endif |
| |
| #ifndef PNG_NO_ERROR_TEXT |
| /* Fatal error in PNG image of libpng - can't continue */ |
| PNG_EXPORT(void,png_error) PNGARG((png_structp png_ptr, |
| png_const_charp error_message)) PNG_NORETURN; |
| |
| /* The same, but the chunk name is prepended to the error string. */ |
| PNG_EXPORT(void,png_chunk_error) PNGARG((png_structp png_ptr, |
| png_const_charp error_message)) PNG_NORETURN; |
| |
| #else |
| /* Fatal error in PNG image of libpng - can't continue */ |
| PNG_EXPORT(void,png_err) PNGARG((png_structp png_ptr)) PNG_NORETURN; |
| #endif |
| |
| /* Non-fatal error in libpng. Can continue, but may have a problem. */ |
| PNG_EXPORT(void,png_warning) PNGARG((png_structp png_ptr, |
| png_const_charp warning_message)); |
| |
| /* Non-fatal error in libpng, chunk name is prepended to message. */ |
| PNG_EXPORT(void,png_chunk_warning) PNGARG((png_structp png_ptr, |
| png_const_charp warning_message)); |
| |
| #ifdef PNG_BENIGN_ERRORS_SUPPORTED |
| /* Benign error in libpng. Can continue, but may have a problem. |
| * User can choose whether to handle as a fatal error or as a warning. */ |
| PNG_EXPORT(void,png_benign_error) PNGARG((png_structp png_ptr, |
| png_const_charp warning_message)); |
| |
| /* Same, chunk name is prepended to message. */ |
| PNG_EXPORT(void,png_chunk_benign_error) PNGARG((png_structp png_ptr, |
| png_const_charp warning_message)); |
| |
| PNG_EXPORT(void,png_set_benign_errors) PNGARG((png_structp |
| png_ptr, int allowed)); |
| #endif |
| |
| /* The png_set_<chunk> functions are for storing values in the png_info_struct. |
| * Similarly, the png_get_<chunk> calls are used to read values from the |
| * png_info_struct, either storing the parameters in the passed variables, or |
| * setting pointers into the png_info_struct where the data is stored. The |
| * png_get_<chunk> functions return a non-zero value if the data was available |
| * in info_ptr, or return zero and do not change any of the parameters if the |
| * data was not available. |
| * |
| * These functions should be used instead of directly accessing png_info |
| * to avoid problems with future changes in the size and internal layout of |
| * png_info_struct. |
| */ |
| /* Returns "flag" if chunk data is valid in info_ptr. */ |
| PNG_EXPORT(png_uint_32,png_get_valid) PNGARG((png_const_structp png_ptr, |
| png_const_infop info_ptr, png_uint_32 flag)); |
| |
| /* Returns number of bytes needed to hold a transformed row. */ |
| PNG_EXPORT(png_size_t,png_get_rowbytes) PNGARG((png_const_structp png_ptr, |
| png_const_infop 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(png_bytepp,png_get_rows) PNGARG((png_const_structp png_ptr, |
| png_const_infop info_ptr)); |
| /* Set row_pointers, which is an array of pointers to scanlines for use |
| * by png_write_png(). |
| */ |
| PNG_EXPORT(void,png_set_rows) PNGARG((png_structp png_ptr, |
| png_infop info_ptr, png_bytepp row_pointers)); |
| #endif |
| |
| /* Returns number of color channels in image. */ |
| PNG_EXPORT(png_byte,png_get_channels) PNGARG((png_const_structp png_ptr, |
| png_const_infop info_ptr)); |
| |
| #ifdef PNG_EASY_ACCESS_SUPPORTED |
| /* Returns image width in pixels. */ |
| PNG_EXPORT(png_uint_32, png_get_image_width) PNGARG((png_const_structp |
| png_ptr, png_const_infop info_ptr)); |
| |
| /* Returns image height in pixels. */ |
| PNG_EXPORT(png_uint_32, png_get_image_height) PNGARG((png_const_structp |
| png_ptr, png_const_infop info_ptr)); |
| |
| /* Returns image bit_depth. */ |
| PNG_EXPORT(png_byte, png_get_bit_depth) PNGARG((png_const_structp |
| png_ptr, png_const_infop info_ptr)); |
| |
| /* Returns image color_type. */ |
| PNG_EXPORT(png_byte, png_get_color_type) PNGARG((png_const_structp |
| png_ptr, png_const_infop info_ptr)); |
| |
| /* Returns image filter_type. */ |
| PNG_EXPORT(png_byte, png_get_filter_type) PNGARG((png_const_structp |
| png_ptr, png_const_infop info_ptr)); |
| |
| /* Returns image interlace_type. */ |
| PNG_EXPORT(png_byte, png_get_interlace_type) PNGARG((png_const_structp |
| png_ptr, png_const_infop info_ptr)); |
| |
| /* Returns image compression_type. */ |
| PNG_EXPORT(png_byte, png_get_compression_type) PNGARG((png_const_structp |
| png_ptr, png_const_infop info_ptr)); |
| |
| /* Returns image resolution in pixels per meter, from pHYs chunk data. */ |
| PNG_EXPORT(png_uint_32, png_get_pixels_per_meter) PNGARG((png_const_structp |
| png_ptr, png_const_infop info_ptr)); |
| PNG_EXPORT(png_uint_32, png_get_x_pixels_per_meter) PNGARG((png_const_structp |
| png_ptr, png_const_infop info_ptr)); |
| PNG_EXPORT(png_uint_32, png_get_y_pixels_per_meter) PNGARG((png_const_structp |
| png_ptr, png_const_infop info_ptr)); |
| |
| /* Returns pixel aspect ratio, computed from pHYs chunk data. */ |
| #ifdef PNG_FLOATING_POINT_SUPPORTED |
| PNG_EXPORT(float, png_get_pixel_aspect_ratio) PNGARG((png_const_structp |
| png_ptr, png_const_infop info_ptr)); |
| #endif |
| |
| /* Returns image x, y offset in pixels or microns, from oFFs chunk data. */ |
| PNG_EXPORT(png_int_32, png_get_x_offset_pixels) PNGARG((png_const_structp |
| png_ptr, png_const_infop info_ptr)); |
| PNG_EXPORT(png_int_32, png_get_y_offset_pixels) PNGARG((png_const_structp |
| png_ptr, png_const_infop info_ptr)); |
| PNG_EXPORT(png_int_32, png_get_x_offset_microns) PNGARG((png_const_structp |
| png_ptr, png_const_infop info_ptr)); |
| PNG_EXPORT(png_int_32, png_get_y_offset_microns) PNGARG((png_const_structp |
| png_ptr, png_const_infop info_ptr)); |
| |
| #endif /* PNG_EASY_ACCESS_SUPPORTED */ |
| |
| /* Returns pointer to signature string read from PNG header */ |
| PNG_EXPORT(png_bytep,png_get_signature) PNGARG((png_const_structp png_ptr, |
| png_infop info_ptr)); |
| |
| #ifdef PNG_bKGD_SUPPORTED |
| PNG_EXPORT(png_uint_32,png_get_bKGD) PNGARG((png_const_structp png_ptr, |
| png_infop info_ptr, png_color_16p *background)); |
| #endif |
| |
| #ifdef PNG_bKGD_SUPPORTED |
| PNG_EXPORT(void,png_set_bKGD) PNGARG((png_structp png_ptr, |
| png_infop info_ptr, png_color_16p background)); |
| #endif |
| |
| #ifdef PNG_cHRM_SUPPORTED |
| #ifdef PNG_FLOATING_POINT_SUPPORTED |
| PNG_EXPORT(png_uint_32,png_get_cHRM) PNGARG((png_const_structp png_ptr, |
| png_const_infop info_ptr, double *white_x, double *white_y, double *red_x, |
| double *red_y, double *green_x, double *green_y, double *blue_x, |
| double *blue_y)); |
| #endif |
| #ifdef PNG_FIXED_POINT_SUPPORTED |
| PNG_EXPORT(png_uint_32,png_get_cHRM_fixed) PNGARG((png_const_structp png_ptr, |
| png_const_infop info_ptr, png_fixed_point *int_white_x, png_fixed_point |
| *int_white_y, png_fixed_point *int_red_x, png_fixed_point *int_red_y, |
| png_fixed_point *int_green_x, png_fixed_point *int_green_y, png_fixed_point |
| *int_blue_x, png_fixed_point *int_blue_y)); |
| #endif |
| #endif |
| |
| #ifdef PNG_cHRM_SUPPORTED |
| #ifdef PNG_FLOATING_POINT_SUPPORTED |
| PNG_EXPORT(void,png_set_cHRM) PNGARG((png_structp png_ptr, |
| png_infop info_ptr, double white_x, double white_y, double red_x, |
| double red_y, double green_x, double green_y, double blue_x, double blue_y)); |
| #endif |
| #ifdef PNG_FIXED_POINT_SUPPORTED |
| PNG_EXPORT(void,png_set_cHRM_fixed) PNGARG((png_structp png_ptr, |
| png_infop info_ptr, png_fixed_point int_white_x, png_fixed_point int_white_y, |
| png_fixed_point int_red_x, png_fixed_point int_red_y, png_fixed_point |
| int_green_x, png_fixed_point int_green_y, png_fixed_point int_blue_x, |
| png_fixed_point int_blue_y)); |
| #endif |
| #endif |
| |
| #ifdef PNG_gAMA_SUPPORTED |
| #ifdef PNG_FLOATING_POINT_SUPPORTED |
| PNG_EXPORT(png_uint_32,png_get_gAMA) PNGARG((png_const_structp png_ptr, |
| png_const_infop info_ptr, double *file_gamma)); |
| #endif |
| PNG_EXPORT(png_uint_32,png_get_gAMA_fixed) PNGARG((png_const_structp png_ptr, |
| png_const_infop info_ptr, png_fixed_point *int_file_gamma)); |
| #endif |
| |
| #ifdef PNG_gAMA_SUPPORTED |
| #ifdef PNG_FLOATING_POINT_SUPPORTED |
| PNG_EXPORT(void,png_set_gAMA) PNGARG((png_structp png_ptr, |
| png_infop info_ptr, double file_gamma)); |
| #endif |
| PNG_EXPORT(void,png_set_gAMA_fixed) PNGARG((png_structp png_ptr, |
| png_infop info_ptr, png_fixed_point int_file_gamma)); |
| #endif |
| |
| #ifdef PNG_hIST_SUPPORTED |
| PNG_EXPORT(png_uint_32,png_get_hIST) PNGARG((png_const_structp png_ptr, |
| png_const_infop info_ptr, png_uint_16p *hist)); |
| #endif |
| |
| #ifdef PNG_hIST_SUPPORTED |
| PNG_EXPORT(void,png_set_hIST) PNGARG((png_structp png_ptr, |
| png_infop info_ptr, png_uint_16p hist)); |
| #endif |
| |
| PNG_EXPORT(png_uint_32,png_get_IHDR) PNGARG((png_structp png_ptr, |
| png_infop info_ptr, png_uint_32 *width, png_uint_32 *height, |
| int *bit_depth, int *color_type, int *interlace_method, |
| int *compression_method, int *filter_method)); |
| |
| PNG_EXPORT(void,png_set_IHDR) PNGARG((png_structp png_ptr, |
| png_infop info_ptr, png_uint_32 width, png_uint_32 height, int bit_depth, |
| int color_type, int interlace_method, int compression_method, |
| int filter_method)); |
| |
| #ifdef PNG_oFFs_SUPPORTED |
| PNG_EXPORT(png_uint_32,png_get_oFFs) PNGARG((png_const_structp png_ptr, |
| png_const_infop info_ptr, png_int_32 *offset_x, png_int_32 *offset_y, |
| int *unit_type)); |
| #endif |
| |
| #ifdef PNG_oFFs_SUPPORTED |
| PNG_EXPORT(void,png_set_oFFs) PNGARG((png_structp png_ptr, |
| png_infop info_ptr, png_int_32 offset_x, png_int_32 offset_y, |
| int unit_type)); |
| #endif |
| |
| #ifdef PNG_pCAL_SUPPORTED |
| PNG_EXPORT(png_uint_32,png_get_pCAL) PNGARG((png_const_structp png_ptr, |
| png_const_infop info_ptr, png_charp *purpose, png_int_32 *X0, png_int_32 *X1, |
| int *type, int *nparams, png_charp *units, png_charpp *params)); |
| #endif |
| |
| #ifdef PNG_pCAL_SUPPORTED |
| PNG_EXPORT(void,png_set_pCAL) PNGARG((png_structp png_ptr, |
| png_infop info_ptr, png_charp purpose, png_int_32 X0, png_int_32 X1, |
| int type, int nparams, png_charp units, png_charpp params)); |
| #endif |
| |
| #ifdef PNG_pHYs_SUPPORTED |
| PNG_EXPORT(png_uint_32,png_get_pHYs) PNGARG((png_const_structp png_ptr, |
| png_const_infop info_ptr, png_uint_32 *res_x, png_uint_32 *res_y, int *unit_type)); |
| #endif |
| |
| #ifdef PNG_pHYs_SUPPORTED |
| PNG_EXPORT(void,png_set_pHYs) PNGARG((png_structp png_ptr, |
| png_infop info_ptr, png_uint_32 res_x, png_uint_32 res_y, int unit_type)); |
| #endif |
| |
| PNG_EXPORT(png_uint_32,png_get_PLTE) PNGARG((png_const_structp png_ptr, |
| png_const_infop info_ptr, png_colorp *palette, int *num_palette)); |
| |
| PNG_EXPORT(void,png_set_PLTE) PNGARG((png_structp png_ptr, |
| png_infop info_ptr, png_colorp palette, int num_palette)); |
| |
| #ifdef PNG_sBIT_SUPPORTED |
| PNG_EXPORT(png_uint_32,png_get_sBIT) PNGARG((png_const_structp png_ptr, |
| png_infop info_ptr, png_color_8p *sig_bit)); |
| #endif |
| |
| #ifdef PNG_sBIT_SUPPORTED |
| PNG_EXPORT(void,png_set_sBIT) PNGARG((png_structp png_ptr, |
| png_infop info_ptr, png_color_8p sig_bit)); |
| #endif |
| |
| #ifdef PNG_sRGB_SUPPORTED |
| PNG_EXPORT(png_uint_32,png_get_sRGB) PNGARG((png_const_structp png_ptr, |
| png_const_infop info_ptr, int *intent)); |
| #endif |
| |
| #ifdef PNG_sRGB_SUPPORTED |
| PNG_EXPORT(void,png_set_sRGB) PNGARG((png_structp png_ptr, |
| png_infop info_ptr, int intent)); |
| PNG_EXPORT(void,png_set_sRGB_gAMA_and_cHRM) PNGARG((png_structp png_ptr, |
| png_infop info_ptr, int intent)); |
| #endif |
| |
| #ifdef PNG_iCCP_SUPPORTED |
| PNG_EXPORT(png_uint_32,png_get_iCCP) PNGARG((png_const_structp png_ptr, |
| png_const_infop info_ptr, png_charpp name, int *compression_type, |
| png_charpp profile, png_uint_32 *proflen)); |
| /* Note to maintainer: profile should be png_bytepp */ |
| #endif |
| |
| #ifdef PNG_iCCP_SUPPORTED |
| PNG_EXPORT(void,png_set_iCCP) PNGARG((png_structp png_ptr, |
| png_infop info_ptr, png_charp name, int compression_type, |
| png_charp profile, png_uint_32 proflen)); |
| /* Note to maintainer: profile should be png_bytep */ |
| #endif |
| |
| #ifdef PNG_sPLT_SUPPORTED |
| PNG_EXPORT(png_uint_32,png_get_sPLT) PNGARG((png_const_structp png_ptr, |
| png_const_infop info_ptr, png_sPLT_tpp entries)); |
| #endif |
| |
| #ifdef PNG_sPLT_SUPPORTED |
| PNG_EXPORT(void,png_set_sPLT) PNGARG((png_structp png_ptr, |
| png_infop info_ptr, png_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(png_uint_32,png_get_text) PNGARG((png_const_structp png_ptr, |
| png_const_infop info_ptr, png_textp *text_ptr, int *num_text)); |
| #endif |
| |
| /* Note while png_set_text() will accept a structure whose text, |
| * language, and translated keywords are NULL pointers, the structure |
| * returned by png_get_text will always contain regular |
| * zero-terminated C strings. They might be empty strings but |
| * they will never be NULL pointers. |
| */ |
| |
| #ifdef PNG_TEXT_SUPPORTED |
| PNG_EXPORT(void,png_set_text) PNGARG((png_structp png_ptr, |
| png_infop info_ptr, png_textp text_ptr, int num_text)); |
| #endif |
| |
| #ifdef PNG_tIME_SUPPORTED |
| PNG_EXPORT(png_uint_32,png_get_tIME) PNGARG((png_const_structp png_ptr, |
| png_infop info_ptr, png_timep *mod_time)); |
| #endif |
| |
| #ifdef PNG_tIME_SUPPORTED |
| PNG_EXPORT(void,png_set_tIME) PNGARG((png_structp png_ptr, |
| png_infop info_ptr, png_timep mod_time)); |
| #endif |
| |
| #ifdef PNG_tRNS_SUPPORTED |
| PNG_EXPORT(png_uint_32,png_get_tRNS) PNGARG((png_const_structp png_ptr, |
| png_infop info_ptr, png_bytep *trans_alpha, int *num_trans, |
| png_color_16p *trans_color)); |
| #endif |
| |
| #ifdef PNG_tRNS_SUPPORTED |
| PNG_EXPORT(void,png_set_tRNS) PNGARG((png_structp png_ptr, |
| png_infop info_ptr, png_bytep trans_alpha, int num_trans, |
| png_color_16p trans_color)); |
| #endif |
| |
| #ifdef PNG_tRNS_SUPPORTED |
| #endif |
| |
| #ifdef PNG_sCAL_SUPPORTED |
| #ifdef PNG_FLOATING_POINT_SUPPORTED |
| PNG_EXPORT(png_uint_32,png_get_sCAL) PNGARG((png_const_structp png_ptr, |
| png_const_infop info_ptr, int *unit, double *width, double *height)); |
| #else |
| #ifdef PNG_FIXED_POINT_SUPPORTED |
| PNG_EXPORT(png_uint_32,png_get_sCAL_s) PNGARG((png_const_structp png_ptr, |
| png_const_infop info_ptr, int *unit, png_charpp swidth, png_charpp sheight)); |
| #endif |
| #endif |
| #endif /* PNG_sCAL_SUPPORTED */ |
| |
| #ifdef PNG_sCAL_SUPPORTED |
| #ifdef PNG_FLOATING_POINT_SUPPORTED |
| PNG_EXPORT(void,png_set_sCAL) PNGARG((png_structp png_ptr, |
| png_infop info_ptr, int unit, double width, double height)); |
| #else |
| #ifdef PNG_FIXED_POINT_SUPPORTED |
| PNG_EXPORT(void,png_set_sCAL_s) PNGARG((png_structp png_ptr, |
| png_infop info_ptr, int unit, png_charp swidth, png_charp sheight)); |
| #endif |
| #endif |
| #endif /* PNG_sCAL_SUPPORTED || PNG_WRITE_sCAL_SUPPORTED */ |
| |
| #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. |
| keep = 0: follow default behaviour |
| = 1: do not keep |
| = 2: keep only if safe-to-copy |
| = 3: keep even if unsafe-to-copy |
| */ |
| PNG_EXPORT(void, png_set_keep_unknown_chunks) PNGARG((png_structp |
| png_ptr, int keep, png_bytep chunk_list, int num_chunks)); |
| PNG_EXPORT(int,png_handle_as_unknown) PNGARG((png_structp png_ptr, png_bytep |
| chunk_name)); |
| #endif |
| #ifdef PNG_UNKNOWN_CHUNKS_SUPPORTED |
| PNG_EXPORT(void, png_set_unknown_chunks) PNGARG((png_structp png_ptr, |
| png_infop info_ptr, png_unknown_chunkp unknowns, int num_unknowns)); |
| PNG_EXPORT(void, png_set_unknown_chunk_location) |
| PNGARG((png_structp png_ptr, png_infop info_ptr, int chunk, int location)); |
| PNG_EXPORT(png_uint_32,png_get_unknown_chunks) PNGARG((png_const_structp |
| png_ptr, png_const_infop 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(void, png_set_invalid) PNGARG((png_structp png_ptr, |
| png_infop info_ptr, int mask)); |
| |
| #ifdef PNG_INFO_IMAGE_SUPPORTED |
| /* The "params" pointer is currently not used and is for future expansion. */ |
| PNG_EXPORT(void, png_read_png) PNGARG((png_structp png_ptr, |
| png_infop info_ptr, |
| int transforms, |
| png_voidp params)); |
| PNG_EXPORT(void, png_write_png) PNGARG((png_structp png_ptr, |
| png_infop info_ptr, |
| int transforms, |
| png_voidp params)); |
| #endif |
| |
| PNG_EXPORT(png_charp,png_get_copyright) PNGARG((png_const_structp png_ptr)); |
| PNG_EXPORT(png_charp,png_get_header_ver) PNGARG((png_const_structp png_ptr)); |
| PNG_EXPORT(png_charp,png_get_header_version) PNGARG((png_const_structp |
| png_ptr)); |
| PNG_EXPORT(png_charp,png_get_libpng_ver) PNGARG((png_const_structp png_ptr)); |
| |
| #ifdef PNG_MNG_FEATURES_SUPPORTED |
| PNG_EXPORT(png_uint_32,png_permit_mng_features) PNGARG((png_structp |
| png_ptr, png_uint_32 mng_features_permitted)); |
| #endif |
| |
| /* For use in png_set_keep_unknown, added to version 1.2.6 */ |
| #define PNG_HANDLE_CHUNK_AS_DEFAULT 0 |
| #define PNG_HANDLE_CHUNK_NEVER 1 |
| #define PNG_HANDLE_CHUNK_IF_SAFE 2 |
| #define PNG_HANDLE_CHUNK_ALWAYS 3 |
| |
| /* Strip the prepended error numbers ("#nnn ") from error and warning |
| * messages before passing them to the error or warning handler. |
| */ |
| #ifdef PNG_ERROR_NUMBERS_SUPPORTED |
| PNG_EXPORT(void,png_set_strip_error_numbers) PNGARG((png_structp |
| png_ptr, png_uint_32 strip_mode)); |
| #endif |
| |
| /* Added in libpng-1.2.6 */ |
| #ifdef PNG_SET_USER_LIMITS_SUPPORTED |
| PNG_EXPORT(void,png_set_user_limits) PNGARG((png_structp |
| png_ptr, png_uint_32 user_width_max, png_uint_32 user_height_max)); |
| PNG_EXPORT(png_uint_32,png_get_user_width_max) PNGARG((png_const_structp |
| png_ptr)); |
| PNG_EXPORT(png_uint_32,png_get_user_height_max) PNGARG((png_const_structp |
| png_ptr)); |
| /* Added in libpng-1.4.0 */ |
| PNG_EXPORT(void,png_set_chunk_cache_max) PNGARG((png_structp |
| png_ptr, png_uint_32 user_chunk_cache_max)); |
| PNG_EXPORT(png_uint_32,png_get_chunk_cache_max) |
| PNGARG((png_const_structp png_ptr)); |
| /* Added in libpng-1.4.1 */ |
| PNG_EXPORT(void,png_set_chunk_malloc_max) PNGARG((png_structp |
| png_ptr, png_alloc_size_t user_chunk_cache_max)); |
| PNG_EXPORT(png_alloc_size_t,png_get_chunk_malloc_max) |
| PNGARG((png_const_structp png_ptr)); |
| #endif |
| |
| #if defined(PNG_INCH_CONVERSIONS) && defined(PNG_FLOATING_POINT_SUPPORTED) |
| PNG_EXPORT(png_uint_32,png_get_pixels_per_inch) |
| PNGARG((png_const_structp png_ptr, png_const_infop info_ptr)); |
| |
| PNG_EXPORT(png_uint_32,png_get_x_pixels_per_inch) |
| PNGARG((png_const_structp png_ptr, png_const_infop info_ptr)); |
| |
| PNG_EXPORT(png_uint_32,png_get_y_pixels_per_inch) |
| PNGARG((png_const_structp png_ptr, png_const_infop info_ptr)); |
| |
| PNG_EXPORT(float,png_get_x_offset_inches) PNGARG((png_const_structp png_ptr, |
| png_const_infop info_ptr)); |
| |
| PNG_EXPORT(float,png_get_y_offset_inches) PNGARG((png_const_structp png_ptr, |
| png_const_infop info_ptr)); |
| |
| #ifdef PNG_pHYs_SUPPORTED |
| PNG_EXPORT(png_uint_32,png_get_pHYs_dpi) PNGARG((png_const_structp png_ptr, |
| png_const_infop info_ptr, png_uint_32 *res_x, png_uint_32 *res_y, |
| int *unit_type)); |
| #endif /* PNG_pHYs_SUPPORTED */ |
| #endif /* PNG_INCH_CONVERSIONS && PNG_FLOATING_POINT_SUPPORTED */ |
| |
| /* Added in libpng-1.4.0 */ |
| #ifdef PNG_IO_STATE_SUPPORTED |
| PNG_EXPORT(png_uint_32,png_get_io_state) PNGARG((png_const_structp png_ptr)); |
| |
| PNG_EXPORT(png_bytep,png_get_io_chunk_name) |
| PNGARG((png_structp png_ptr)); |
| |
| /* The flags returned by png_get_io_state() are the following: */ |
| #define PNG_IO_NONE 0x0000 /* no I/O at this moment */ |
| #define PNG_IO_READING 0x0001 /* currently reading */ |
| #define PNG_IO_WRITING 0x0002 /* currently writing */ |
| #define PNG_IO_SIGNATURE 0x0010 /* currently at the file signature */ |
| #define PNG_IO_CHUNK_HDR 0x0020 /* currently at the chunk header */ |
| #define PNG_IO_CHUNK_DATA 0x0040 /* currently at the chunk data */ |
| #define PNG_IO_CHUNK_CRC 0x0080 /* currently at the chunk crc */ |
| #define PNG_IO_MASK_OP 0x000f /* current operation: reading/writing */ |
| #define PNG_IO_MASK_LOC 0x00f0 /* current location: sig/hdr/data/crc */ |
| #endif /* ?PNG_IO_STATE_SUPPORTED */ |
| |
| /* Maintainer: Put new public prototypes here ^, in libpng.3, and project |
| * defs |
| */ |
| |
| #ifdef PNG_READ_COMPOSITE_NODIV_SUPPORTED |
| /* With these routines we avoid an integer divide, which will be slower on |
| * most machines. However, it does take more operations than the corresponding |
| * divide method, so it may be slower on a few RISC systems. There are two |
| * shifts (by 8 or 16 bits) and an addition, versus a single integer divide. |
| * |
| * Note that the rounding factors are NOT supposed to be the same! 128 and |
| * 32768 are correct for the NODIV code; 127 and 32767 are correct for the |
| * standard method. |
| * |
| * [Optimized code by Greg Roelofs and Mark Adler...blame us for bugs. :-) ] |
| */ |
| |
| /* fg and bg should be in `gamma 1.0' space; alpha is the opacity */ |
| |
| # define png_composite(composite, fg, alpha, bg) \ |
| { png_uint_16 temp = (png_uint_16)((png_uint_16)(fg) \ |
| * (png_uint_16)(alpha) \ |
| + (png_uint_16)(bg)*(png_uint_16)(255 \ |
| - (png_uint_16)(alpha)) + (png_uint_16)128); \ |
| (composite) = (png_byte)((temp + (temp >> 8)) >> 8); } |
| |
| # define png_composite_16(composite, fg, alpha, bg) \ |
| { png_uint_32 temp = (png_uint_32)((png_uint_32)(fg) \ |
| * (png_uint_32)(alpha) \ |
| + (png_uint_32)(bg)*(png_uint_32)(65535L \ |
| - (png_uint_32)(alpha)) + (png_uint_32)32768L); \ |
| (composite) = (png_uint_16)((temp + (temp >> 16)) >> 16); } |
| |
| #else /* Standard method using integer division */ |
| |
| # define png_composite(composite, fg, alpha, bg) \ |
| (composite) = (png_byte)(((png_uint_16)(fg) * (png_uint_16)(alpha) + \ |
| (png_uint_16)(bg) * (png_uint_16)(255 - (png_uint_16)(alpha)) + \ |
| (png_uint_16)127) / 255) |
| |
| # define png_composite_16(composite, fg, alpha, bg) \ |
| (composite) = (png_uint_16)(((png_uint_32)(fg) * (png_uint_32)(alpha) + \ |
| (png_uint_32)(bg)*(png_uint_32)(65535L - (png_uint_32)(alpha)) + \ |
| (png_uint_32)32767) / (png_uint_32)65535L) |
| #endif /* PNG_READ_COMPOSITE_NODIV_SUPPORTED */ |
| |
| #ifdef PNG_USE_READ_MACROS |
| /* Inline macros to do direct reads of bytes from the input buffer. |
| * The png_get_int_32() routine assumes we are using two's complement |
| * format for negative values, which is almost certainly true. |
| */ |
| # 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)))) |
| |
| /* The following definition introduces an API incompatibility (but not |
| * an ABI incompatibility) with libpng-1.4.0 through 1.4.4. Prior to |
| * libpng-1.4.5 the macro, which is used by default, returned (incorrectly) |
| * a (png_uint_32), while the function, if used instead, correctly returned |
| * a (png_uint_16). |
| * |
| * Libpng versions 1.0.x and 1.2.x only used a function so are not affected |
| * by this potential API incompatibility between macros. |
| */ |
| # 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))) |
| #else |
| PNG_EXPORT(png_uint_32,png_get_uint_32) PNGARG((png_bytep buf)); |
| PNG_EXPORT(png_uint_16,png_get_uint_16) PNGARG((png_bytep buf)); |
| #ifdef PNG_GET_INT_32_SUPPORTED |
| PNG_EXPORT(png_int_32,png_get_int_32) PNGARG((png_bytep buf)); |
| #endif |
| #endif |
| PNG_EXPORT(png_uint_32,png_get_uint_31) |
| PNGARG((png_structp png_ptr, png_bytep buf)); |
| /* No png_get_int_16 -- may be added if there's a real need for it. */ |
| |
| /* Place a 32-bit number into a buffer in PNG byte order (big-endian). */ |
| PNG_EXPORT(void,png_save_uint_32) |
| PNGARG((png_bytep buf, png_uint_32 i)); |
| PNG_EXPORT(void,png_save_int_32) |
| PNGARG((png_bytep buf, png_int_32 i)); |
| |
| /* Place a 16-bit number into a buffer in PNG byte order. |
| * The parameter is declared unsigned int, not png_uint_16, |
| * just to avoid potential problems on pre-ANSI C compilers. |
| */ |
| PNG_EXPORT(void,png_save_uint_16) |
| PNGARG((png_bytep buf, unsigned int i)); |
| /* No png_save_int_16 -- may be added if there's a real need for it. */ |
| |
| /* ************************************************************************* */ |
| |
| /* Various modes of operation. Note that after an init, mode is set to |
| * zero automatically when the structure is created. |
| */ |
| #define PNG_HAVE_IHDR 0x01 |
| #define PNG_HAVE_PLTE 0x02 |
| #define PNG_HAVE_IDAT 0x04 |
| #define PNG_AFTER_IDAT 0x08 /* Have complete zlib datastream */ |
| #define PNG_HAVE_IEND 0x10 |
| #define PNG_HAVE_gAMA 0x20 |
| #define PNG_HAVE_cHRM 0x40 |
| |
| #ifdef __cplusplus |
| } |
| #endif |
| |
| #endif /* PNG_VERSION_INFO_ONLY */ |
| /* Do not put anything past this line */ |
| #endif /* PNG_H */ |
