/* png.h - header file for PNG reference library * * libpng version 1.5.0beta46 - August 26, 2010 * Copyright (c) 1998-2010 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 1.5.0beta46 - August 26, 2010: Glenn * See also "Contributing Authors", below. * * Note about libpng version numbers: * * Due to various miscommunications, unforeseen code incompatibilities * and occasional factors outside the authors' control, version numbering * on the library has not always been consistent and straightforward. * The following table summarizes matters since version 0.89c, which was * the first widely used release: * * source png.h png.h shared-lib * version string int version * ------- ------ ----- ---------- * 0.89c "1.0 beta 3" 0.89 89 1.0.89 * 0.90 "1.0 beta 4" 0.90 90 0.90 [should have been 2.0.90] * 0.95 "1.0 beta 5" 0.95 95 0.95 [should have been 2.0.95] * 0.96 "1.0 beta 6" 0.96 96 0.96 [should have been 2.0.96] * 0.97b "1.00.97 beta 7" 1.00.97 97 1.0.1 [should have been 2.0.97] * 0.97c 0.97 97 2.0.97 * 0.98 0.98 98 2.0.98 * 0.99 0.99 98 2.0.99 * 0.99a-m 0.99 99 2.0.99 * 1.00 1.00 100 2.1.0 [100 should be 10000] * 1.0.0 (from here on, the 100 2.1.0 [100 should be 10000] * 1.0.1 png.h string is 10001 2.1.0 * 1.0.1a-e identical to the 10002 from here on, the shared library * 1.0.2 source version) 10002 is 2.V where V is the source code * 1.0.2a-b 10003 version, except as noted. * 1.0.3 10003 * 1.0.3a-d 10004 * 1.0.4 10004 * 1.0.4a-f 10005 * 1.0.5 (+ 2 patches) 10005 * 1.0.5a-d 10006 * 1.0.5e-r 10100 (not source compatible) * 1.0.5s-v 10006 (not binary compatible) * 1.0.6 (+ 3 patches) 10006 (still binary incompatible) * 1.0.6d-f 10007 (still binary incompatible) * 1.0.6g 10007 * 1.0.6h 10007 10.6h (testing xy.z so-numbering) * 1.0.6i 10007 10.6i * 1.0.6j 10007 2.1.0.6j (incompatible with 1.0.0) * 1.0.7beta11-14 DLLNUM 10007 2.1.0.7beta11-14 (binary compatible) * 1.0.7beta15-18 1 10007 2.1.0.7beta15-18 (binary compatible) * 1.0.7rc1-2 1 10007 2.1.0.7rc1-2 (binary compatible) * 1.0.7 1 10007 (still compatible) * 1.0.8beta1-4 1 10008 2.1.0.8beta1-4 * 1.0.8rc1 1 10008 2.1.0.8rc1 * 1.0.8 1 10008 2.1.0.8 * 1.0.9beta1-6 1 10009 2.1.0.9beta1-6 * 1.0.9rc1 1 10009 2.1.0.9rc1 * 1.0.9beta7-10 1 10009 2.1.0.9beta7-10 * 1.0.9rc2 1 10009 2.1.0.9rc2 * 1.0.9 1 10009 2.1.0.9 * 1.0.10beta1 1 10010 2.1.0.10beta1 * 1.0.10rc1 1 10010 2.1.0.10rc1 * 1.0.10 1 10010 2.1.0.10 * 1.0.11beta1-3 1 10011 2.1.0.11beta1-3 * 1.0.11rc1 1 10011 2.1.0.11rc1 * 1.0.11 1 10011 2.1.0.11 * 1.0.12beta1-2 2 10012 2.1.0.12beta1-2 * 1.0.12rc1 2 10012 2.1.0.12rc1 * 1.0.12 2 10012 2.1.0.12 * 1.1.0a-f - 10100 2.1.1.0a-f (branch abandoned) * 1.2.0beta1-2 2 10200 2.1.2.0beta1-2 * 1.2.0beta3-5 3 10200 3.1.2.0beta3-5 * 1.2.0rc1 3 10200 3.1.2.0rc1 * 1.2.0 3 10200 3.1.2.0 * 1.2.1beta1-4 3 10201 3.1.2.1beta1-4 * 1.2.1rc1-2 3 10201 3.1.2.1rc1-2 * 1.2.1 3 10201 3.1.2.1 * 1.2.2beta1-6 12 10202 12.so.0.1.2.2beta1-6 * 1.0.13beta1 10 10013 10.so.0.1.0.13beta1 * 1.0.13rc1 10 10013 10.so.0.1.0.13rc1 * 1.2.2rc1 12 10202 12.so.0.1.2.2rc1 * 1.0.13 10 10013 10.so.0.1.0.13 * 1.2.2 12 10202 12.so.0.1.2.2 * 1.2.3rc1-6 12 10203 12.so.0.1.2.3rc1-6 * 1.2.3 12 10203 12.so.0.1.2.3 * 1.2.4beta1-3 13 10204 12.so.0.1.2.4beta1-3 * 1.0.14rc1 13 10014 10.so.0.1.0.14rc1 * 1.2.4rc1 13 10204 12.so.0.1.2.4rc1 * 1.0.14 10 10014 10.so.0.1.0.14 * 1.2.4 13 10204 12.so.0.1.2.4 * 1.2.5beta1-2 13 10205 12.so.0.1.2.5beta1-2 * 1.0.15rc1-3 10 10015 10.so.0.1.0.15rc1-3 * 1.2.5rc1-3 13 10205 12.so.0.1.2.5rc1-3 * 1.0.15 10 10015 10.so.0.1.0.15 * 1.2.5 13 10205 12.so.0.1.2.5 * 1.2.6beta1-4 13 10206 12.so.0.1.2.6beta1-4 * 1.0.16 10 10016 10.so.0.1.0.16 * 1.2.6 13 10206 12.so.0.1.2.6 * 1.2.7beta1-2 13 10207 12.so.0.1.2.7beta1-2 * 1.0.17rc1 10 10017 12.so.0.1.0.17rc1 * 1.2.7rc1 13 10207 12.so.0.1.2.7rc1 * 1.0.17 10 10017 12.so.0.1.0.17 * 1.2.7 13 10207 12.so.0.1.2.7 * 1.2.8beta1-5 13 10208 12.so.0.1.2.8beta1-5 * 1.0.18rc1-5 10 10018 12.so.0.1.0.18rc1-5 * 1.2.8rc1-5 13 10208 12.so.0.1.2.8rc1-5 * 1.0.18 10 10018 12.so.0.1.0.18 * 1.2.8 13 10208 12.so.0.1.2.8 * 1.2.9beta1-3 13 10209 12.so.0.1.2.9beta1-3 * 1.2.9beta4-11 13 10209 12.so.0.9[.0] * 1.2.9rc1 13 10209 12.so.0.9[.0] * 1.2.9 13 10209 12.so.0.9[.0] * 1.2.10beta1-7 13 10210 12.so.0.10[.0] * 1.2.10rc1-2 13 10210 12.so.0.10[.0] * 1.2.10 13 10210 12.so.0.10[.0] * 1.4.0beta1-5 14 10400 14.so.0.0[.0] * 1.2.11beta1-4 13 10211 12.so.0.11[.0] * 1.4.0beta7-8 14 10400 14.so.0.0[.0] * 1.2.11 13 10211 12.so.0.11[.0] * 1.2.12 13 10212 12.so.0.12[.0] * 1.4.0beta9-14 14 10400 14.so.0.0[.0] * 1.2.13 13 10213 12.so.0.13[.0] * 1.4.0beta15-36 14 10400 14.so.0.0[.0] * 1.4.0beta37-87 14 10400 14.so.14.0[.0] * 1.4.0rc01 14 10400 14.so.14.0[.0] * 1.4.0beta88-109 14 10400 14.so.14.0[.0] * 1.4.0rc02-08 14 10400 14.so.14.0[.0] * 1.4.0 14 10400 14.so.14.0[.0] * 1.4.1beta01-03 14 10401 14.so.14.1[.0] * 1.4.1rc01 14 10401 14.so.14.1[.0] * 1.4.1beta04-12 14 10401 14.so.14.1[.0] * 1.4.1 14 10401 14.so.14.1[.0] * 1.4.2 14 10402 14.so.14.2[.0] * 1.4.3 14 10403 14.so.14.3[.0] * 1.5.0beta01-45 15 10500 15.so.15.0[.0] * * Henceforth the source version will match the shared-library major * and minor numbers; the shared-library major version number will be * used for changes in backward compatibility, as it is intended. The * PNG_LIBPNG_VER macro, which is not used within libpng but is available * for applications, is an unsigned integer of the form xyyzz corresponding * to the source version x.y.z (leading zeros in y and z). Beta versions * were given the previous public release number plus a letter, until * version 1.0.6j; from then on they were given the upcoming public * release number plus "betaNN" or "rcN". * * Binary incompatibility exists only when applications make direct access * to the info_ptr or png_ptr members through png.h, and the compiled * application is loaded with a different version of the library. * * DLLNUM will change each time there are forward or backward changes * in binary compatibility (e.g., when a new feature is added). * * See libpng.txt or libpng.3 for more information. The PNG specification * is available as a W3C Recommendation and as an ISO Specification, * # endif /* Need the time information for converting tIME chunks, it * defines struct tm: */ #ifdef PNG_CONVERT_tIME_SUPPORTED /* "time.h" functions are not supported on all operating systems */ # include #endif /* Machine specific configuration. */ # include "pngconf.h" #endif /* * Added at libpng-1.2.8 * * Ref MSDN: Private as priority over Special * VS_FF_PRIVATEBUILD File *was not* built using standard release * procedures. If this value is given, the StringFileInfo block must * contain a PrivateBuild string. * * VS_FF_SPECIALBUILD File *was* built by the original company using * standard release procedures but is a variation of the standard * file of the same version number. If this value is given, the * StringFileInfo block must contain a SpecialBuild string. */ #ifdef PNG_USER_PRIVATEBUILD /* From pnglibconf.h */ # define PNG_LIBPNG_BUILD_TYPE \ (PNG_LIBPNG_BUILD_BASE_TYPE | PNG_LIBPNG_BUILD_PRIVATE) #else # ifdef PNG_LIBPNG_SPECIALBUILD # define PNG_LIBPNG_BUILD_TYPE \ (PNG_LIBPNG_BUILD_BASE_TYPE | PNG_LIBPNG_BUILD_SPECIAL) # else # define PNG_LIBPNG_BUILD_TYPE (PNG_LIBPNG_BUILD_BASE_TYPE) # endif #endif #ifndef PNG_VERSION_INFO_ONLY /* Inhibit C++ name-mangling for libpng functions but not for system calls. */ #ifdef __cplusplus extern "C" { #endif /* __cplusplus */ /* Version information for C files, stored in png.c. This had better match * the version above. */ #define png_libpng_ver png_get_header_ver(NULL) /* This file is arranged in several sections: * * 1. Any configuration options that can be specified by for the application * code when it is built. (Build time configuration is in pnglibconf.h) * 2. Type definitions (base types are defined in pngconf.h), structure * definitions. * 3. Exported library functions. * * The library source code has additional files (principally pngpriv.h) that * allow configuration of the library. */ /* Section 1: run time configuration * See pnglibconf.h for build time configuration * * Run time configuration allows the application to choose between * implementations of certain arithmetic APIs. The default is set * at build time and recorded in pnglibconf.h, but it is safe to * override these (and only these) settings. Note that this won't * change what the library does, only application code, and the * settings can (and probably should) be made on a per-file basis * by setting the #defines before including png.h * * Use macros to read integers from PNG data or use the exported * functions? * PNG_USE_READ_MACROS: use the macros (see below) Note that * the macros evaluate their argument multiple times. * PNG_NO_USE_READ_MACROS: call the relevant library function. * * Use the alternative algorithm for compositing alpha samples that * does not use division? * PNG_READ_COMPOSITE_NODIV_SUPPORTED: use the 'no division' * algorithm. * PNG_NO_READ_COMPOSITE_NODIV: use the 'division' algorithm. * * How to handle benign errors if PNG_ALLOW_BENIGN_ERRORS is * false? * PNG_ALLOW_BENIGN_ERRORS: map calls to the benign error * APIs to png_warning. * Otherwise the calls are mapped to png_error. */ /* Section 2: type definitions, including structures and compile time * constants. * See pngconf.h for base types that vary by machine/system */ /* 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_CONST png_color FAR * png_const_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_CONST png_color_16 FAR * png_const_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_CONST png_color_8 FAR * png_const_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_CONST png_sPLT_entry FAR * png_const_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_CONST png_sPLT_t FAR * png_const_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 */ png_size_t itxt_length; /* length of the itxt string */ png_charp lang; /* language code, 0-79 characters or a NULL pointer */ png_charp lang_key; /* keyword translated UTF-8 string, 0 or more chars or a NULL pointer */ } png_text; typedef png_text FAR * png_textp; typedef PNG_CONST png_text FAR * png_const_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_CONST png_time FAR * png_const_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_CONST png_unknown_chunk FAR * png_const_unknown_chunkp; typedef png_unknown_chunk FAR * FAR * png_unknown_chunkpp; #endif typedef struct png_info_def png_info; typedef png_info FAR * png_infop; typedef png_info FAR * FAR * png_infopp; /* Maximum positive integer used in PNG is (2^31)-1 */ #define PNG_UINT_31_MAX ((png_uint_32)0x7fffffffL) #define PNG_UINT_32_MAX ((png_uint_32)(-1)) #define PNG_SIZE_MAX ((png_size_t)(-1)) /* These are constants for fixed point values encoded in the * PNG specification manner (x100000) */ #define PNG_FP_1 100000 #define PNG_FP_HALF 50000 /* 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_ 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. Note that the 'write' function must not * modify the buffer it is passed. The 'read' function, on the other hand, is * expected to return the read data in the buffer. */ typedef struct png_struct_def png_struct; typedef png_struct FAR * png_structp; typedef PNG_CALLBACK(void, *png_error_ptr, (png_structp, png_const_charp),); typedef PNG_CALLBACK(void, *png_rw_ptr, (png_structp, png_bytep, png_size_t),); typedef PNG_CALLBACK(void, *png_flush_ptr, (png_structp),); typedef PNG_CALLBACK(void, *png_read_status_ptr, (png_structp, png_uint_32, int),); typedef PNG_CALLBACK(void, *png_write_status_ptr, (png_structp, png_uint_32, int),); #ifdef PNG_PROGRESSIVE_READ_SUPPORTED typedef PNG_CALLBACK(void, *png_progressive_info_ptr, (png_structp, png_infop),); typedef PNG_CALLBACK(void, *png_progressive_end_ptr, (png_structp, png_infop),); typedef PNG_CALLBACK(void, *png_progressive_row_ptr, (png_structp, png_bytep, png_uint_32, int),); #endif #if defined(PNG_READ_USER_TRANSFORM_SUPPORTED) || \ defined(PNG_WRITE_USER_TRANSFORM_SUPPORTED) typedef PNG_CALLBACK(void, *png_user_transform_ptr, (png_structp, png_row_infop, png_bytep),); #endif #ifdef PNG_USER_CHUNKS_SUPPORTED typedef PNG_CALLBACK(int, *png_user_chunk_ptr, (png_structp, png_unknown_chunkp),); #endif #ifdef PNG_UNKNOWN_CHUNKS_SUPPORTED typedef PNG_CALLBACK(void, *png_unknown_chunk_ptr, (png_structp),); #endif #ifdef PNG_SETJMP_SUPPORTED /* This must match the function definition in , and the * application must include this before png.h to obtain the definition * of jmp_buf. The function is required to be PNG_NORETURN. (Note that * PNG_PTR_NORETURN is used here because current versions of the Microsoft * C compiler do not support the PNG_NORETURN attribute on a pointer.) * * If you get a type warning from the compiler when linking against this line * then your compiler has 'longjmp' that does not match the requirements of the * compiler that built libpng. You will have to write a wrapper function for * your compiler's longjmp and call png_set_longjmp_fn directly (not via the * png_jmpbuf macro.) * * If you get a warning here while building the library you will need to make * changes to ensure that pnglibconf.h records the calling convention used by * your compiler. This may be very difficult - try using a different compiler * to build the library! */ typedef PNG_FUNCTION(void,(PNGCAPI *png_longjmp_ptr),PNGARG((jmp_buf, int)), PNG_PTR_NORETURN); #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 /* NOTE: prior to 1.5 these functions had no 'API' style declaration, * this allowed the zlib default functions to be used on Windows * platforms. In 1.5 the zlib default malloc (which just calls malloc and * ignores the first argument) should be completely compatible with the * following. */ typedef PNG_CALLBACK(png_voidp, *png_malloc_ptr, (png_structp, png_alloc_size_t),); typedef PNG_CALLBACK(void, *png_free_ptr, (png_structp, png_voidp),); /* 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_5_0beta46; typedef png_struct FAR * FAR * png_structpp; /* Section 3: exported functions * Here are the function definitions most commonly used. This is not * the place to find out how to use libpng. See libpng.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,(void),,1); /* Tell lib we have already handled the first magic bytes. * Handling more than 8 bytes from the beginning of the file is an error. */ PNG_EXPORT(void,png_set_sig_bytes,(png_structp png_ptr, int num_bytes),,2); /* 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,(png_const_bytep sig, png_size_t start, png_size_t num_to_check),,3); /* 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,(png_const_charp user_png_ver, png_voidp error_ptr, png_error_ptr error_fn, png_error_ptr warn_fn), PNG_ALLOCATED,4); /* Allocate and initialize png_ptr struct for writing, and any other memory */ PNG_EXPORT(png_structp,png_create_write_struct,(png_const_charp user_png_ver, png_voidp error_ptr, png_error_ptr error_fn, png_error_ptr warn_fn), PNG_ALLOCATED,5); PNG_EXPORT(png_size_t,png_get_compression_buffer_size,(png_structp png_ptr),,6); PNG_EXPORT(void,png_set_compression_buffer_size,(png_structp png_ptr, png_size_t size),,7); /* 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,(png_structp png_ptr, png_longjmp_ptr longjmp_fn, size_t jmp_buf_size),,8); # define png_jmpbuf(png_ptr) \ (*png_set_longjmp_fn((png_ptr), longjmp, sizeof (jmp_buf))) #else # define png_jmpbuf(png_ptr) \ (LIBPNG_WAS_COMPILED_WITH__PNG_NO_SETJMP) #endif /* This function should be used by libpng applications in place of * longjmp(png_ptr->jmpbuf, val). If longjmp_fn() has been set, it * will use it; otherwise it will call PNG_ABORT(). This function was * added in libpng-1.5.0. */ PNG_EXPORT(void,png_longjmp,(png_structp png_ptr, int val),PNG_NORETURN,9); #ifdef PNG_READ_SUPPORTED /* Reset the compression stream */ PNG_EXPORT(int,png_reset_zstream,(png_structp png_ptr),,10); #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,(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,11); PNG_EXPORT(png_structp,png_create_write_struct_2,(png_const_charp user_png_ver, png_voidp error_ptr, png_error_ptr error_fn, png_error_ptr warn_fn, png_voidp mem_ptr, png_malloc_ptr malloc_fn, png_free_ptr free_fn), PNG_ALLOCATED,12); #endif /* Write the PNG file signature. */ PNG_EXPORT(void,png_write_sig,(png_structp png_ptr),,13); /* Write a PNG chunk - size, type, (optional) data, CRC. */ PNG_EXPORT(void,png_write_chunk,(png_structp png_ptr, png_const_bytep chunk_name, png_const_bytep data, png_size_t length),,14); /* Write the start of a PNG chunk - length and chunk name. */ PNG_EXPORT(void,png_write_chunk_start,(png_structp png_ptr, png_const_bytep chunk_name, png_uint_32 length),,15); /* Write the data of a PNG chunk started with png_write_chunk_start(). */ PNG_EXPORT(void,png_write_chunk_data,(png_structp png_ptr, png_const_bytep data, png_size_t length),,16); /* Finish a chunk started with png_write_chunk_start() (includes CRC). */ PNG_EXPORT(void,png_write_chunk_end,(png_structp png_ptr),,17); /* Allocate and initialize the info structure */ PNG_EXPORT(png_infop,png_create_info_struct,(png_structp png_ptr), PNG_ALLOCATED,18); PNG_EXPORT(void,png_info_init_3,(png_infopp info_ptr, png_size_t png_info_struct_size),,19); /* Writes all the PNG information before the image. */ PNG_EXPORT(void,png_write_info_before_PLTE,(png_structp png_ptr, png_infop info_ptr),,20); PNG_EXPORT(void,png_write_info,(png_structp png_ptr, png_infop info_ptr),,21); #ifdef PNG_SEQUENTIAL_READ_SUPPORTED /* Read the information before the actual image data. */ PNG_EXPORT(void,png_read_info,(png_structp png_ptr, png_infop info_ptr),,22); #endif #ifdef PNG_TIME_RFC1123_SUPPORTED PNG_EXPORT(png_const_charp,png_convert_to_rfc1123,(png_structp png_ptr, png_const_timep ptime),,23); #endif #ifdef PNG_CONVERT_tIME_SUPPORTED /* Convert from a struct tm to png_time */ PNG_EXPORT(void,png_convert_from_struct_tm,(png_timep ptime, PNG_CONST struct tm FAR * ttime),,24); /* Convert from time_t to png_time. Uses gmtime() */ PNG_EXPORT(void,png_convert_from_time_t,(png_timep ptime, time_t ttime),,25); #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,(png_structp png_ptr),,26); PNG_EXPORT(void,png_set_expand_gray_1_2_4_to_8,(png_structp png_ptr),,27); PNG_EXPORT(void,png_set_palette_to_rgb,(png_structp png_ptr),,28); PNG_EXPORT(void,png_set_tRNS_to_alpha,(png_structp png_ptr),,29); #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,(png_structp png_ptr),,30); #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,(png_structp png_ptr),,31); /* Reduce RGB to grayscale. */ PNG_FP_EXPORT(void,png_set_rgb_to_gray,(png_structp png_ptr, int error_action, double red, double green ),,32); PNG_FIXED_EXPORT(void,png_set_rgb_to_gray_fixed,(png_structp png_ptr, int error_action, png_fixed_point red, png_fixed_point green),,33); PNG_EXPORT(png_byte,png_get_rgb_to_gray_status,(png_structp png_ptr),,34); #endif PNG_EXPORT(void,png_build_grayscale_palette,(int bit_depth, png_colorp palette),,35); #ifdef PNG_READ_STRIP_ALPHA_SUPPORTED PNG_EXPORT(void,png_set_strip_alpha,(png_structp png_ptr),,36); #endif #if defined(PNG_READ_SWAP_ALPHA_SUPPORTED) || \ defined(PNG_WRITE_SWAP_ALPHA_SUPPORTED) PNG_EXPORT(void,png_set_swap_alpha,(png_structp png_ptr),,37); #endif #if defined(PNG_READ_INVERT_ALPHA_SUPPORTED) || \ defined(PNG_WRITE_INVERT_ALPHA_SUPPORTED) PNG_EXPORT(void,png_set_invert_alpha,(png_structp png_ptr),,38); #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,(png_structp png_ptr, png_uint_32 filler, int flags),,39); /* 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,(png_structp png_ptr, png_uint_32 filler, int flags),,40); #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,(png_structp png_ptr),,41); #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,(png_structp png_ptr),,42); #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,(png_structp png_ptr),,43); #endif #if defined(PNG_READ_SHIFT_SUPPORTED) || defined(PNG_WRITE_SHIFT_SUPPORTED) /* Converts files to legal bit depths. */ PNG_EXPORT(void,png_set_shift,(png_structp png_ptr, png_const_color_8p true_bits),,44); #endif #if defined(PNG_READ_INTERLACING_SUPPORTED) || \ defined(PNG_WRITE_INTERLACING_SUPPORTED) /* Have the code handle the interlacing. Returns the number of passes. * MUST be called before png_read_update_info or png_start_read_image, otherwise * it will not have the desired effect. Note that it is still necessary to call * png_read_row or png_read_rows png_get_image_height times for each pass. */ PNG_EXPORT(int,png_set_interlace_handling,(png_structp png_ptr),,45); #endif #ifdef PNG_SEQUENTIAL_READ_SUPPORTED /* Alternatively call this to get the number of rows in the current pass. Call * this after png_read_update_info or png_start_read_image; if you call it * before it will just return the image height (which is also what it returns * for a non-interlaced image!). * * NOTE: you need to call these to find out how many times to call png_read_row * if you handle your own de-interlacing. */ PNG_EXPORT(int,png_get_num_passes,(png_structp png_ptr),,215); PNG_EXPORT(png_uint_32,png_get_num_rows,(png_structp png_ptr),,216); PNG_EXPORT(png_uint_32,png_get_num_cols,(png_structp png_ptr),,218); #endif #if defined(PNG_READ_INVERT_SUPPORTED) || defined(PNG_WRITE_INVERT_SUPPORTED) /* Invert monochrome files */ PNG_EXPORT(void,png_set_invert_mono,(png_structp png_ptr),,46); #endif #ifdef PNG_READ_BACKGROUND_SUPPORTED /* Handle alpha and tRNS by replacing with a background color. */ PNG_FP_EXPORT(void,png_set_background,(png_structp png_ptr, png_const_color_16p background_color, int background_gamma_code, int need_expand, double background_gamma),,47); PNG_FIXED_EXPORT(void,png_set_background_fixed,(png_structp png_ptr, png_const_color_16p background_color, int background_gamma_code, int need_expand, png_fixed_point background_gamma),,217); #endif #ifdef PNG_READ_BACKGROUND_SUPPORTED # define PNG_BACKGROUND_GAMMA_UNKNOWN 0 # define PNG_BACKGROUND_GAMMA_SCREEN 1 # define PNG_BACKGROUND_GAMMA_FILE 2 # define PNG_BACKGROUND_GAMMA_UNIQUE 3 #endif #ifdef PNG_READ_16_TO_8_SUPPORTED /* Strip the second byte of information from a 16-bit depth file. */ PNG_EXPORT(void,png_set_strip_16,(png_structp png_ptr),,48); #endif #ifdef PNG_READ_QUANTIZE_SUPPORTED /* Turn on quantizing, and reduce the palette to the number of colors * available. */ PNG_EXPORT(void,png_set_quantize,(png_structp png_ptr, png_colorp palette, int num_palette, int maximum_colors, png_const_uint_16p histogram, int full_quantize),,49); #endif #ifdef PNG_READ_GAMMA_SUPPORTED /* The threshold on gamma processing is configurable but hard-wired into the * library. The following is the floating point variant. */ #define PNG_GAMMA_THRESHOLD (PNG_GAMMA_THRESHOLD_FIXED*.00001) /* Handle gamma correction. Screen_gamma=(display_exponent) */ PNG_FP_EXPORT(void,png_set_gamma,(png_structp png_ptr, double screen_gamma, double default_file_gamma),,50); PNG_FIXED_EXPORT(void,png_set_gamma_fixed,(png_structp png_ptr, png_fixed_point screen_gamma, png_fixed_point default_file_gamma),,208); #endif #ifdef PNG_WRITE_FLUSH_SUPPORTED /* Set how many lines between output flushes - 0 for no flushing */ PNG_EXPORT(void,png_set_flush,(png_structp png_ptr, int nrows),,51); /* Flush the current PNG output buffer */ PNG_EXPORT(void,png_write_flush,(png_structp png_ptr),,52); #endif /* Optional update palette with requested transformations */ PNG_EXPORT(void,png_start_read_image,(png_structp png_ptr),,53); /* Optional call to update the users info structure */ PNG_EXPORT(void,png_read_update_info,(png_structp png_ptr, png_infop info_ptr),, 54); #ifdef PNG_SEQUENTIAL_READ_SUPPORTED /* Read one or more rows of image data. */ PNG_EXPORT(void,png_read_rows,(png_structp png_ptr, png_bytepp row, png_bytepp display_row, png_uint_32 num_rows),,55); #endif #ifdef PNG_SEQUENTIAL_READ_SUPPORTED /* Read a row of data. */ PNG_EXPORT(void,png_read_row,(png_structp png_ptr, png_bytep row, png_bytep display_row),,56); #endif #ifdef PNG_SEQUENTIAL_READ_SUPPORTED /* Read the whole image into memory at once. */ PNG_EXPORT(void,png_read_image,(png_structp png_ptr, png_bytepp image),,57); #endif /* Write a row of image data */ PNG_EXPORT(void,png_write_row,(png_structp png_ptr, png_const_bytep row),,58); /* Write a few rows of image data: (*row) is not written; however, the type is * declared as writeable to maintain compatibility with previous versions of * libpng and to allow the 'display_row' array from read_rows to be passed * unchanged to write_rows. */ PNG_EXPORT(void,png_write_rows,(png_structp png_ptr, png_bytepp row, png_uint_32 num_rows),,59); /* Write the image data */ PNG_EXPORT(void,png_write_image,(png_structp png_ptr, png_bytepp image),,60); /* Write the end of the PNG file. */ PNG_EXPORT(void,png_write_end,(png_structp png_ptr, png_infop info_ptr),,61); #ifdef PNG_SEQUENTIAL_READ_SUPPORTED /* Read the end of the PNG file. */ PNG_EXPORT(void,png_read_end,(png_structp png_ptr, png_infop info_ptr),,62); #endif /* Free any memory associated with the png_info_struct */ PNG_EXPORT(void,png_destroy_info_struct,(png_structp png_ptr, png_infopp info_ptr_ptr),,63); /* Free any memory associated with the png_struct and the png_info_structs */ PNG_EXPORT(void,png_destroy_read_struct,(png_structpp png_ptr_ptr, png_infopp info_ptr_ptr, png_infopp end_info_ptr_ptr),,64); /* Free any memory associated with the png_struct and the png_info_structs */ PNG_EXPORT(void,png_destroy_write_struct,(png_structpp png_ptr_ptr, png_infopp info_ptr_ptr),,65); /* Set the libpng method of handling chunk CRC errors */ PNG_EXPORT(void,png_set_crc_action,(png_structp png_ptr, int crit_action, int ancil_action),,66); /* 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,(png_structp png_ptr, int method, int filters),, 67); /* Flags for png_set_filter() to say which filters to use. The flags * are chosen so that they don't conflict with real filter types * below, in case they are supplied instead of the #defined constants. * These values should NOT be changed. */ #define PNG_NO_FILTERS 0x00 #define PNG_FILTER_NONE 0x08 #define PNG_FILTER_SUB 0x10 #define PNG_FILTER_UP 0x20 #define PNG_FILTER_AVG 0x40 #define PNG_FILTER_PAETH 0x80 #define PNG_ALL_FILTERS (PNG_FILTER_NONE | PNG_FILTER_SUB | PNG_FILTER_UP | \ PNG_FILTER_AVG | PNG_FILTER_PAETH) /* Filter values (not flags) - used in pngwrite.c, pngwutil.c for now. * These defines should NOT be changed. */ #define PNG_FILTER_VALUE_NONE 0 #define PNG_FILTER_VALUE_SUB 1 #define PNG_FILTER_VALUE_UP 2 #define PNG_FILTER_VALUE_AVG 3 #define PNG_FILTER_VALUE_PAETH 4 #define PNG_FILTER_VALUE_LAST 5 #ifdef PNG_WRITE_WEIGHTED_FILTER_SUPPORTED /* EXPERIMENTAL */ /* The "heuristic_method" is given by one of the PNG_FILTER_HEURISTIC_ * defines, either the default (minimum-sum-of-absolute-differences), or * the experimental method (weighted-minimum-sum-of-absolute-differences). * * Weights are factors >= 1.0, indicating how important it is to keep the * filter type consistent between rows. Larger numbers mean the current * filter is that many times as likely to be the same as the "num_weights" * previous filters. This is cumulative for each previous row with a weight. * There needs to be "num_weights" values in "filter_weights", or it can be * NULL if the weights aren't being specified. Weights have no influence on * the selection of the first row filter. Well chosen weights can (in theory) * improve the compression for a given image. * * Costs are factors >= 1.0 indicating the relative decoding costs of a * filter type. Higher costs indicate more decoding expense, and are * therefore less likely to be selected over a filter with lower computational * costs. There needs to be a value in "filter_costs" for each valid filter * type (given by PNG_FILTER_VALUE_LAST), or it can be NULL if you aren't * setting the costs. Costs try to improve the speed of decompression without * unduly increasing the compressed image size. * * A negative weight or cost indicates the default value is to be used, and * values in the range [0.0, 1.0) indicate the value is to remain unchanged. * The default values for both weights and costs are currently 1.0, but may * change if good general weighting/cost heuristics can be found. If both * the weights and costs are set to 1.0, this degenerates the WEIGHTED method * to the UNWEIGHTED method, but with added encoding time/computation. */ PNG_FP_EXPORT(void,png_set_filter_heuristics,(png_structp png_ptr, int heuristic_method, int num_weights, png_const_doublep filter_weights, png_const_doublep filter_costs),,68); PNG_FIXED_EXPORT(void,png_set_filter_heuristics_fixed,(png_structp png_ptr, int heuristic_method, int num_weights, png_const_fixed_point_p filter_weights, png_const_fixed_point_p filter_costs),,209); #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,(png_structp png_ptr, int level),,69); PNG_EXPORT(void,png_set_compression_mem_level,(png_structp png_ptr, int mem_level),,70); PNG_EXPORT(void,png_set_compression_strategy,(png_structp png_ptr, int strategy),,71); PNG_EXPORT(void,png_set_compression_window_bits,(png_structp png_ptr, int window_bits),,72); PNG_EXPORT(void,png_set_compression_method,(png_structp png_ptr, int method),, 73); /* 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,(png_structp png_ptr, png_FILE_p fp),,74); #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,(png_structp png_ptr, png_voidp error_ptr, png_error_ptr error_fn, png_error_ptr warning_fn),,75); /* Return the user pointer associated with the error functions */ PNG_EXPORT(png_voidp,png_get_error_ptr,(png_structp png_ptr),,76); /* 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,(png_structp png_ptr, png_voidp io_ptr, png_rw_ptr write_data_fn, png_flush_ptr output_flush_fn),,77); /* Replace the default data input function with a user supplied one. */ PNG_EXPORT(void,png_set_read_fn,(png_structp png_ptr, png_voidp io_ptr, png_rw_ptr read_data_fn),,78); /* Return the user pointer associated with the I/O functions */ PNG_EXPORT(png_voidp,png_get_io_ptr,(png_structp png_ptr),,79); PNG_EXPORT(void,png_set_read_status_fn,(png_structp png_ptr, png_read_status_ptr read_row_fn),,80); PNG_EXPORT(void,png_set_write_status_fn,(png_structp png_ptr, png_write_status_ptr write_row_fn),,81); #ifdef PNG_USER_MEM_SUPPORTED /* Replace the default memory allocation functions with user supplied one(s). */ PNG_EXPORT(void,png_set_mem_fn,(png_structp png_ptr, png_voidp mem_ptr, png_malloc_ptr malloc_fn, png_free_ptr free_fn),,82); /* Return the user pointer associated with the memory functions */ PNG_EXPORT(png_voidp,png_get_mem_ptr,(png_structp png_ptr),,83); #endif #ifdef PNG_READ_USER_TRANSFORM_SUPPORTED PNG_EXPORT(void,png_set_read_user_transform_fn,(png_structp png_ptr, png_user_transform_ptr read_user_transform_fn),,84); #endif #ifdef PNG_WRITE_USER_TRANSFORM_SUPPORTED PNG_EXPORT(void,png_set_write_user_transform_fn,(png_structp png_ptr, png_user_transform_ptr write_user_transform_fn),,85); #endif #if defined(PNG_READ_USER_TRANSFORM_SUPPORTED) || \ defined(PNG_WRITE_USER_TRANSFORM_SUPPORTED) PNG_EXPORT(void,png_set_user_transform_info,(png_structp png_ptr, png_voidp user_transform_ptr, int user_transform_depth, int user_transform_channels),,86); /* Return the user pointer associated with the user transform functions */ PNG_EXPORT(png_voidp,png_get_user_transform_ptr,(png_structp png_ptr),,87); #endif #ifdef PNG_USER_CHUNKS_SUPPORTED PNG_EXPORT(void,png_set_read_user_chunk_fn,(png_structp png_ptr, png_voidp user_chunk_ptr, png_user_chunk_ptr read_user_chunk_fn),,88); PNG_EXPORT(png_voidp,png_get_user_chunk_ptr,(png_structp png_ptr),,89); #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,(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),,90); /* Returns the user pointer associated with the push read functions */ PNG_EXPORT(png_voidp,png_get_progressive_ptr,(png_structp png_ptr),,91); /* Function to be called when data becomes available */ PNG_EXPORT(void,png_process_data,(png_structp png_ptr, png_infop info_ptr, png_bytep buffer, png_size_t buffer_size),,92); /* Function that combines rows. 'new_row' is a flag that should come from the * callback and be non-NULL if anything needs to be done; the library stores its * own version of the new data internally and ignores the passed in value. */ PNG_EXPORT(void,png_progressive_combine_row,(png_structp png_ptr, png_bytep old_row, png_const_bytep new_row),,93); #endif /* PNG_PROGRESSIVE_READ_SUPPORTED */ PNG_EXPORT(png_voidp,png_malloc,(png_structp png_ptr, png_alloc_size_t size), PNG_ALLOCATED,94); /* Added at libpng version 1.4.0 */ PNG_EXPORT(png_voidp,png_calloc,(png_structp png_ptr, png_alloc_size_t size), PNG_ALLOCATED,95); /* Added at libpng version 1.2.4 */ PNG_EXPORT(png_voidp,png_malloc_warn,(png_structp png_ptr, png_alloc_size_t size),PNG_ALLOCATED,96); /* Frees a pointer allocated by png_malloc() */ PNG_EXPORT(void,png_free,(png_structp png_ptr, png_voidp ptr),,97); /* Free data that was allocated internally */ PNG_EXPORT(void,png_free_data,(png_structp png_ptr, png_infop info_ptr, png_uint_32 free_me, int num),,98); /* Reassign responsibility for freeing existing data, whether allocated * by libpng or by the application */ PNG_EXPORT(void,png_data_freer,(png_structp png_ptr, png_infop info_ptr, int freer, png_uint_32 mask),,99); /* 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,(png_structp png_ptr, png_alloc_size_t size),PNG_ALLOCATED,100); PNG_EXPORT(void,png_free_default,(png_structp png_ptr, png_voidp ptr),,101); #endif #ifdef PNG_ERROR_TEXT_SUPPORTED /* Fatal error in PNG image of libpng - can't continue */ PNG_EXPORT(void,png_error,(png_structp png_ptr, png_const_charp error_message), PNG_NORETURN,102); /* The same, but the chunk name is prepended to the error string. */ PNG_EXPORT(void,png_chunk_error,(png_structp png_ptr, png_const_charp error_message),PNG_NORETURN,103); #else /* Fatal error in PNG image of libpng - can't continue */ PNG_EXPORT(void,png_err,(png_structp png_ptr),PNG_NORETURN,104); #endif /* Non-fatal error in libpng. Can continue, but may have a problem. */ PNG_EXPORT(void,png_warning,(png_structp png_ptr, png_const_charp warning_message),,105); /* Non-fatal error in libpng, chunk name is prepended to message. */ PNG_EXPORT(void,png_chunk_warning,(png_structp png_ptr, png_const_charp warning_message),,106); #ifdef PNG_BENIGN_ERRORS_SUPPORTED /* Benign error in libpng. Can continue, but may have a problem. * User can choose whether to handle as a fatal error or as a warning. */ # undef png_benign_error PNG_EXPORT(void,png_benign_error,(png_structp png_ptr, png_const_charp warning_message),,107); /* Same, chunk name is prepended to message. */ # undef png_chunk_benign_error PNG_EXPORT(void,png_chunk_benign_error,(png_structp png_ptr, png_const_charp warning_message),,108); PNG_EXPORT(void,png_set_benign_errors,(png_structp png_ptr, int allowed),,109); #else # ifdef PNG_ALLOW_BENIGN_ERRORS # define png_benign_error png_warning # define png_chunk_benign_error png_chunk_warning # else # define png_benign_error png_error # define png_chunk_benign_error png_chunk_error # endif #endif /* The png_set_ functions are for storing values in the png_info_struct. * Similarly, the png_get_ 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_ 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,(png_structp png_ptr, png_infop info_ptr, png_uint_32 flag),,110); /* Returns number of bytes needed to hold a transformed row. */ PNG_EXPORT(png_size_t,png_get_rowbytes,(png_structp png_ptr, png_infop info_ptr),,111); #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,(png_structp png_ptr, png_infop info_ptr),, 112); /* Set row_pointers, which is an array of pointers to scanlines for use * by png_write_png(). */ PNG_EXPORT(void,png_set_rows,(png_structp png_ptr, png_infop info_ptr, png_bytepp row_pointers),,113); #endif /* Returns number of color channels in image. */ PNG_EXPORT(png_byte,png_get_channels,(png_structp png_ptr, png_infop info_ptr),, 114); #ifdef PNG_EASY_ACCESS_SUPPORTED /* Returns image width in pixels. */ PNG_EXPORT(png_uint_32,png_get_image_width,(png_structp png_ptr, png_infop info_ptr),,115); /* Returns image height in pixels. */ PNG_EXPORT(png_uint_32,png_get_image_height,(png_structp png_ptr, png_infop info_ptr),,116); /* Returns image bit_depth. */ PNG_EXPORT(png_byte,png_get_bit_depth,(png_structp png_ptr, png_infop info_ptr), ,117); /* Returns image color_type. */ PNG_EXPORT(png_byte,png_get_color_type,(png_structp png_ptr, png_infop info_ptr),,118); /* Returns image filter_type. */ PNG_EXPORT(png_byte,png_get_filter_type,(png_structp png_ptr, png_infop info_ptr),,119); /* Returns image interlace_type. */ PNG_EXPORT(png_byte,png_get_interlace_type,(png_structp png_ptr, png_infop info_ptr),,120); /* Returns image compression_type. */ PNG_EXPORT(png_byte,png_get_compression_type,(png_structp png_ptr, png_infop info_ptr),,121); /* Returns image resolution in pixels per meter, from pHYs chunk data. */ PNG_EXPORT(png_uint_32,png_get_pixels_per_meter,(png_structp png_ptr, png_infop info_ptr),,122); PNG_EXPORT(png_uint_32,png_get_x_pixels_per_meter,(png_structp png_ptr, png_infop info_ptr),,123); PNG_EXPORT(png_uint_32,png_get_y_pixels_per_meter,(png_structp png_ptr, png_infop info_ptr),,124); /* Returns pixel aspect ratio, computed from pHYs chunk data. */ PNG_FP_EXPORT(float,png_get_pixel_aspect_ratio,(png_structp png_ptr, png_infop info_ptr),,125); PNG_FIXED_EXPORT(png_fixed_point,png_get_pixel_aspect_ratio_fixed, (png_structp png_ptr, png_infop info_ptr),,210); /* Returns image x, y offset in pixels or microns, from oFFs chunk data. */ PNG_EXPORT(png_int_32,png_get_x_offset_pixels,(png_structp png_ptr, png_infop info_ptr),,126); PNG_EXPORT(png_int_32,png_get_y_offset_pixels,(png_structp png_ptr, png_infop info_ptr),,127); PNG_EXPORT(png_int_32,png_get_x_offset_microns,(png_structp png_ptr, png_infop info_ptr),,128); PNG_EXPORT(png_int_32, png_get_y_offset_microns,(png_structp png_ptr, png_infop info_ptr),,129); #endif /* PNG_EASY_ACCESS_SUPPORTED */ /* Returns pointer to signature string read from PNG header */ PNG_EXPORT(png_const_bytep,png_get_signature,(png_structp png_ptr, png_infop info_ptr),,130); #ifdef PNG_bKGD_SUPPORTED PNG_EXPORT(png_uint_32,png_get_bKGD,(png_structp png_ptr, png_infop info_ptr, png_color_16p *background),,131); #endif #ifdef PNG_bKGD_SUPPORTED PNG_EXPORT(void,png_set_bKGD,(png_structp png_ptr, png_infop info_ptr, png_const_color_16p background),,132); #endif #ifdef PNG_cHRM_SUPPORTED PNG_FP_EXPORT(png_uint_32,png_get_cHRM,(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),,133); #ifdef PNG_FIXED_POINT_SUPPORTED /* Otherwise not implemented */ PNG_FIXED_EXPORT(png_uint_32,png_get_cHRM_fixed,(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),,134); #endif #endif #ifdef PNG_cHRM_SUPPORTED PNG_FP_EXPORT(void,png_set_cHRM,(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),,135); PNG_FIXED_EXPORT(void,png_set_cHRM_fixed,(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),,136); #endif #ifdef PNG_gAMA_SUPPORTED PNG_FP_EXPORT(png_uint_32,png_get_gAMA,(png_structp png_ptr, png_infop info_ptr, double *file_gamma),,137); PNG_FIXED_EXPORT(png_uint_32,png_get_gAMA_fixed,(png_structp png_ptr, png_infop info_ptr, png_fixed_point *int_file_gamma),,138); #endif #ifdef PNG_gAMA_SUPPORTED PNG_FP_EXPORT(void,png_set_gAMA,(png_structp png_ptr, png_infop info_ptr, double file_gamma),,139); PNG_FIXED_EXPORT(void,png_set_gAMA_fixed,(png_structp png_ptr, png_infop info_ptr, png_fixed_point int_file_gamma),,140); #endif #ifdef PNG_hIST_SUPPORTED PNG_EXPORT(png_uint_32,png_get_hIST,(png_structp png_ptr, png_infop info_ptr, png_uint_16p *hist),,141); #endif #ifdef PNG_hIST_SUPPORTED PNG_EXPORT(void,png_set_hIST,(png_structp png_ptr, png_infop info_ptr, png_const_uint_16p hist),,142); #endif PNG_EXPORT(png_uint_32,png_get_IHDR,(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),,143); PNG_EXPORT(void,png_set_IHDR,(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),,144); #ifdef PNG_oFFs_SUPPORTED PNG_EXPORT(png_uint_32,png_get_oFFs,(png_structp png_ptr, png_infop info_ptr, png_int_32 *offset_x, png_int_32 *offset_y, int *unit_type),,145); #endif #ifdef PNG_oFFs_SUPPORTED PNG_EXPORT(void,png_set_oFFs,(png_structp png_ptr, png_infop info_ptr, png_int_32 offset_x, png_int_32 offset_y, int unit_type),,146); #endif #ifdef PNG_pCAL_SUPPORTED PNG_EXPORT(png_uint_32,png_get_pCAL,(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),,147); #endif #ifdef PNG_pCAL_SUPPORTED PNG_EXPORT(void,png_set_pCAL,(png_structp png_ptr, png_infop info_ptr, png_const_charp purpose, png_int_32 X0, png_int_32 X1, int type, int nparams, png_const_charp units, png_charpp params),,148); #endif #ifdef PNG_pHYs_SUPPORTED PNG_EXPORT(png_uint_32,png_get_pHYs,(png_structp png_ptr, png_infop info_ptr, png_uint_32 *res_x, png_uint_32 *res_y, int *unit_type),,149); #endif #ifdef PNG_pHYs_SUPPORTED PNG_EXPORT(void,png_set_pHYs,(png_structp png_ptr, png_infop info_ptr, png_uint_32 res_x, png_uint_32 res_y, int unit_type),,150); #endif PNG_EXPORT(png_uint_32,png_get_PLTE,(png_structp png_ptr, png_infop info_ptr, png_colorp *palette, int *num_palette),,151); PNG_EXPORT(void,png_set_PLTE,(png_structp png_ptr, png_infop info_ptr, png_const_colorp palette, int num_palette),,152); #ifdef PNG_sBIT_SUPPORTED PNG_EXPORT(png_uint_32,png_get_sBIT,(png_structp png_ptr, png_infop info_ptr, png_color_8p *sig_bit),,153); #endif #ifdef PNG_sBIT_SUPPORTED PNG_EXPORT(void,png_set_sBIT,(png_structp png_ptr, png_infop info_ptr, png_const_color_8p sig_bit),,154); #endif #ifdef PNG_sRGB_SUPPORTED PNG_EXPORT(png_uint_32,png_get_sRGB,(png_structp png_ptr, png_infop info_ptr, int *intent),,155); #endif #ifdef PNG_sRGB_SUPPORTED PNG_EXPORT(void,png_set_sRGB,(png_structp png_ptr, png_infop info_ptr, int intent),,156); PNG_EXPORT(void,png_set_sRGB_gAMA_and_cHRM,(png_structp png_ptr, png_infop info_ptr, int intent),,157); #endif #ifdef PNG_iCCP_SUPPORTED PNG_EXPORT(png_uint_32,png_get_iCCP,(png_structp png_ptr, png_infop info_ptr, png_charpp name, int *compression_type, png_bytepp profile, png_uint_32 *proflen),,158); #endif #ifdef PNG_iCCP_SUPPORTED PNG_EXPORT(void,png_set_iCCP,(png_structp png_ptr, png_infop info_ptr, png_const_charp name, int compression_type, png_const_bytep profile, png_uint_32 proflen),,159); #endif #ifdef PNG_sPLT_SUPPORTED PNG_EXPORT(png_uint_32,png_get_sPLT,(png_structp png_ptr, png_infop info_ptr, png_sPLT_tpp entries),,160); #endif #ifdef PNG_sPLT_SUPPORTED PNG_EXPORT(void,png_set_sPLT,(png_structp png_ptr, png_infop info_ptr, png_const_sPLT_tp entries, int nentries),,161); #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,(png_structp png_ptr, png_infop info_ptr, png_textp *text_ptr, int *num_text),,162); #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,(png_structp png_ptr, png_infop info_ptr, png_const_textp text_ptr, int num_text),,163); #endif #ifdef PNG_tIME_SUPPORTED PNG_EXPORT(png_uint_32,png_get_tIME,(png_structp png_ptr, png_infop info_ptr, png_timep *mod_time),,164); #endif #ifdef PNG_tIME_SUPPORTED PNG_EXPORT(void,png_set_tIME,(png_structp png_ptr, png_infop info_ptr, png_const_timep mod_time),,165); #endif #ifdef PNG_tRNS_SUPPORTED PNG_EXPORT(png_uint_32,png_get_tRNS,(png_structp png_ptr, png_infop info_ptr, png_bytep *trans_alpha, int *num_trans, png_color_16p *trans_color),,166); #endif #ifdef PNG_tRNS_SUPPORTED PNG_EXPORT(void,png_set_tRNS,(png_structp png_ptr, png_infop info_ptr, png_const_bytep trans_alpha, int num_trans, png_const_color_16p trans_color),,167); #endif #ifdef PNG_sCAL_SUPPORTED PNG_FP_EXPORT(png_uint_32,png_get_sCAL,(png_structp png_ptr, png_infop info_ptr, int *unit, double *width, double *height),,168); #ifdef PNG_FLOATING_ARITHMETIC_SUPPORTED /* NOTE: this API is currently implemented using floating point arithmetic, * consequently it can only be used on systems with floating point support. * In any case the range of values supported by png_fixed_point is small and it * is highly recommended that png_get_sCAL_s be used instead. */ PNG_FIXED_EXPORT(png_uint_32,png_get_sCAL_fixed,(png_structp png_ptr, png_infop info_ptr, int *unit, png_fixed_point *width, png_fixed_point *height),,214); #endif PNG_EXPORT(png_uint_32,png_get_sCAL_s,(png_structp png_ptr, png_infop info_ptr, int *unit, png_charpp swidth, png_charpp sheight),,169); PNG_FP_EXPORT(void,png_set_sCAL,(png_structp png_ptr, png_infop info_ptr, int unit, double width, double height),,170); PNG_FIXED_EXPORT(void,png_set_sCAL_fixed,(png_structp png_ptr, png_infop info_ptr, int unit, png_fixed_point width, png_fixed_point height),,213); PNG_EXPORT(void,png_set_sCAL_s,(png_structp png_ptr, png_infop info_ptr, int unit, png_const_charp swidth, png_const_charp sheight),,171); #endif /* PNG_sCAL_SUPPORTED */ #ifdef PNG_HANDLE_AS_UNKNOWN_SUPPORTED /* Provide a list of chunks and how they are to be handled, if the built-in handling or default unknown chunk handling is not desired. Any chunks not listed will be handled in the default manner. The IHDR and IEND chunks must not be listed. 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,(png_structp png_ptr, int keep, png_const_bytep chunk_list, int num_chunks),,172); PNG_EXPORT(int,png_handle_as_unknown,(png_structp png_ptr, png_const_bytep chunk_name),,173); #endif #ifdef PNG_UNKNOWN_CHUNKS_SUPPORTED PNG_EXPORT(void, png_set_unknown_chunks,(png_structp png_ptr, png_infop info_ptr, png_const_unknown_chunkp unknowns, int num_unknowns),, 174); PNG_EXPORT(void, png_set_unknown_chunk_location, (png_structp png_ptr, png_infop info_ptr, int chunk, int location),,175); PNG_EXPORT(int,png_get_unknown_chunks,(png_structp png_ptr, png_infop info_ptr, png_unknown_chunkpp entries),,176); #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,(png_structp png_ptr, png_infop info_ptr, int mask),,177); #ifdef PNG_INFO_IMAGE_SUPPORTED /* The "params" pointer is currently not used and is for future expansion. */ PNG_EXPORT(void, png_read_png,(png_structp png_ptr, png_infop info_ptr, int transforms, png_voidp params),,178); PNG_EXPORT(void, png_write_png,(png_structp png_ptr, png_infop info_ptr, int transforms, png_voidp params),,179); #endif PNG_EXPORT(png_const_charp,png_get_copyright,(png_structp png_ptr),,180); PNG_EXPORT(png_const_charp,png_get_header_ver,(png_structp png_ptr),,181); PNG_EXPORT(png_const_charp,png_get_header_version,(png_structp png_ptr),,182); PNG_EXPORT(png_const_charp,png_get_libpng_ver,(png_structp png_ptr),,183); #ifdef PNG_MNG_FEATURES_SUPPORTED PNG_EXPORT(png_uint_32,png_permit_mng_features,(png_structp png_ptr, png_uint_32 mng_features_permitted),,184); #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,(png_structp png_ptr, png_uint_32 strip_mode),,185); #endif /* Added in libpng-1.2.6 */ #ifdef PNG_SET_USER_LIMITS_SUPPORTED PNG_EXPORT(void,png_set_user_limits,(png_structp png_ptr, png_uint_32 user_width_max, png_uint_32 user_height_max),,186); PNG_EXPORT(png_uint_32,png_get_user_width_max,(png_structp png_ptr),,187); PNG_EXPORT(png_uint_32,png_get_user_height_max,(png_structp png_ptr),,188); /* Added in libpng-1.4.0 */ PNG_EXPORT(void,png_set_chunk_cache_max,(png_structp png_ptr, png_uint_32 user_chunk_cache_max),,189); PNG_EXPORT(png_uint_32,png_get_chunk_cache_max,(png_structp png_ptr),,190); /* Added in libpng-1.4.1 */ PNG_EXPORT(void,png_set_chunk_malloc_max,(png_structp png_ptr, png_alloc_size_t user_chunk_cache_max),,191); PNG_EXPORT(png_alloc_size_t,png_get_chunk_malloc_max,(png_structp png_ptr),, 192); #endif #if defined(PNG_INCH_CONVERSIONS_SUPPORTED) PNG_EXPORT(png_uint_32,png_get_pixels_per_inch,(png_structp png_ptr, png_infop info_ptr),,193); PNG_EXPORT(png_uint_32,png_get_x_pixels_per_inch,(png_structp png_ptr, png_infop info_ptr),,194); PNG_EXPORT(png_uint_32,png_get_y_pixels_per_inch,(png_structp png_ptr, png_infop info_ptr),,195); PNG_FP_EXPORT(float,png_get_x_offset_inches,(png_structp png_ptr, png_infop info_ptr),,196); #ifdef PNG_FIXED_POINT_SUPPORTED /* otherwise not implemented. */ PNG_FIXED_EXPORT(png_fixed_point,png_get_x_offset_inches_fixed, (png_structp png_ptr, png_infop info_ptr),,211); #endif PNG_FP_EXPORT(float,png_get_y_offset_inches,(png_structp png_ptr, png_infop info_ptr),,197); #ifdef PNG_FIXED_POINT_SUPPORTED /* otherwise not implemented. */ PNG_FIXED_EXPORT(png_fixed_point,png_get_y_offset_inches_fixed, (png_structp png_ptr, png_infop info_ptr),,212); #endif # ifdef PNG_pHYs_SUPPORTED PNG_EXPORT(png_uint_32,png_get_pHYs_dpi,(png_structp png_ptr, png_infop info_ptr, png_uint_32 *res_x, png_uint_32 *res_y, int *unit_type), ,198); # endif /* PNG_pHYs_SUPPORTED */ #endif /* PNG_INCH_CONVERSIONS_SUPPORTED */ /* Added in libpng-1.4.0 */ #ifdef PNG_IO_STATE_SUPPORTED PNG_EXPORT(png_uint_32,png_get_io_state,(png_structp png_ptr),,199); PNG_EXPORT(png_const_bytep,png_get_io_chunk_name,(png_structp png_ptr),,200); /* 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 */ #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)))) # define png_get_uint_16(buf) \ (((png_uint_32)(*(buf)) << 8) + \ ((png_uint_32)(*((buf) + 1)))) # define png_get_int_32(buf) \ ((png_int_32)((*(buf) & 0x80) \ ? -((png_int_32)((png_get_uint_32(buf) ^ 0xffffffff)+1)) \ : (png_int_32)png_get_uint_32(buf))) #endif #ifdef PNG_READ_INT_FUNCTIONS_SUPPORTED PNG_EXPORT(png_uint_32,png_get_uint_32,(png_const_bytep buf),,201); PNG_EXPORT(png_uint_16,png_get_uint_16,(png_const_bytep buf),,202); PNG_EXPORT(png_int_32,png_get_int_32,(png_const_bytep buf),,203); #endif PNG_EXPORT(png_uint_32,png_get_uint_31,(png_structp png_ptr, png_const_bytep buf),,204); /* No png_get_int_16 -- may be added if there's a real need for it. */ /* Place a 32-bit number into a buffer in PNG byte order (big-endian). */ #ifdef PNG_WRITE_INT_FUNCTIONS_SUPPORTED PNG_EXPORT(void,png_save_uint_32,(png_bytep buf, png_uint_32 i),,205); #endif #ifdef PNG_SAVE_INT_32_SUPPORTED PNG_EXPORT(void,png_save_int_32,(png_bytep buf, png_int_32 i),,206); #endif /* Place a 16-bit number into a buffer in PNG byte order. * The parameter is declared unsigned int, not png_uint_16, * just to avoid potential problems on pre-ANSI C compilers. */ #ifdef PNG_WRITE_INT_FUNCTIONS_SUPPORTED PNG_EXPORT(void,png_save_uint_16,(png_bytep buf, unsigned int i),,207); /* No png_save_int_16 -- may be added if there's a real need for it. */ #endif /* Maintainer: Put new public prototypes here ^, in libpng.3, and project * defs */ /* The last ordinal number (this is the *last* one, the next one to * use is one more than this.) */ #ifdef PNG_EXPORT_LAST_ORDINAL PNG_EXPORT_LAST_ORDINAL(218); #endif #ifdef __cplusplus } #endif #endif /* PNG_VERSION_INFO_ONLY */ /* Do not put anything past this line */ #endif /* PNG_H */