/* png.h - header file for PNG reference library * * libpng version 1.4.8 - July 7, 2011 * 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 1.4.8 - July 7, 2011: 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] * * Henceforth the source version will match the shared-library major * and minor numbers; the shared-library major version number will be * used for changes in backward compatibility, as it is intended. The * PNG_LIBPNG_VER macro, which is not used within libpng but is available * for applications, is an unsigned integer of the form xyyzz corresponding * to the source version x.y.z (leading zeros in y and z). Beta versions * were given the previous public release number plus a letter, until * version 1.0.6j; from then on they were given the upcoming public * release number plus "betaNN" or "rcN". * * Binary incompatibility exists only when applications make direct access * to the info_ptr or png_ptr members through png.h, and the compiled * application is loaded with a different version of the library. * * DLLNUM will change each time there are forward or backward changes * in binary compatibility (e.g., when a new feature is added). * * See libpng.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 1.4.8, July 7, 2011, 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 7, 2011 * * 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 1.4.8 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 "1.4.8" #define PNG_HEADER_VERSION_STRING \ " libpng version 1.4.8 - July 7, 2011\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 8 /* 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_BETA /* Careful here. At one time, Guy wanted to use 082, but that would be octal. * We must not include leading zeros. * Versions 0.7 through 1.0.0 were in the range 0 to 100 here (only * version 1.0.0 was mis-numbered 100 instead of 10000). From * version 1.0.1 it's xxyyzz, where x=major, y=minor, z=release */ #define PNG_LIBPNG_VER 10408 /* 1.4.8 */ #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_8; 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 */