1 /* $MirOS: src/lib/libpng/png.h,v 1.11 2013/08/06 18:49:27 tg Exp $ */ 2 3 /* png.h - header file for MirOS in-tree PNG library 4 * 5 * See png.5 or libpng.3 for more information. 6 */ 7 8 /* 9 * COPYRIGHT NOTICE, DISCLAIMER, and LICENSE: 10 * 11 * libpng-MirOS is distributed according to the terms set forth below, 12 * the Licensor being the MirOS Project and Thorsten Glaser as leader, 13 * with the following copyright holders: 14 * 15 * Copyright (c) 2004-2009 Thorsten Glaser, The MirOS Project 16 * Copyright (c) 1998-2012 Glenn Randers-Pehrson 17 * Copyright (c) 1996, 1997 Andreas Dilger 18 * Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc. 19 * 20 * This work is provided "AS IS" and WITHOUT WARRANTY of any kind, to 21 * the utmost extent permitted by applicable law, neither express nor 22 * implied; without malicious intent or gross negligence. In no event 23 * may a licensor, author or contributor be held liable for indirect, 24 * direct, other damage, loss, or other issues arising in any way out 25 * of dealing in the work, even if advised of the possibility of such 26 * damage or existence of a defect, except proven that it results out 27 * of said person's immediate fault when using the work as intended. 28 * 29 * For the purposes of this copyright and license, "Contributing Authors" 30 * is defined as the following set of individuals: 31 * 32 * Andreas Dilger 33 * Dave Martindale 34 * Guy Eric Schalnat 35 * Paul Schmidt 36 * Tim Wegner 37 * Cosmin Truta 38 * Simon-Pierre Cadieux 39 * Eric S. Raymond 40 * Gilles Vollant 41 * Tom Lane 42 * Glenn Randers-Pehrson 43 * Willem van Schaik 44 * John Bowler 45 * Kevin Bracey 46 * Sam Bushell 47 * Magnus Holmgren 48 * Greg Roelofs 49 * Tom Tanner 50 * 51 * The PNG Reference Library is supplied "AS IS". The Contributing Authors 52 * (as well as The MirOS Project as publisher of this modified version) 53 * and Group 42, Inc. disclaim all warranties, expressed or implied, 54 * including, without limitation, the warranties of merchantability and of 55 * fitness for any purpose. The Contributing Authors and Group 42, Inc. 56 * assume no liability for direct, indirect, incidental, special, exemplary, 57 * or consequential damages, which may result from the use of the PNG 58 * Reference Library, even if advised of the possibility of such damage. 59 * 60 * There is no warranty against interference with your enjoyment of the 61 * library or against infringement. There is no warranty that our 62 * efforts or the library will fulfill any of your particular purposes 63 * or needs. This library is provided with all faults, and the entire 64 * risk of satisfactory quality, performance, accuracy, and effort is with 65 * the user. 66 * 67 * Permission is hereby granted to use, copy, modify, and distribute this 68 * source code, or portions hereof, for any purpose, without fee, subject 69 * to the following restrictions: 70 * 71 * 1. The origin of this source code must not be misrepresented. 72 * 73 * 2. Altered versions must be plainly marked as such and 74 * must not be misrepresented as being the original source. 75 * 76 * 3. This Copyright notice may not be removed or altered from 77 * any source or altered source distribution. 78 * 79 * The Contributing Authors and Group 42, Inc. specifically permit, without 80 * fee, and encourage the use of this source code as a component to 81 * supporting the PNG file format in commercial products. If you use this 82 * source code in a product, acknowledgment is not required but would be 83 * appreciated. 84 */ 85 86 /* 87 * Libpng is OSI Certified Open Source Software. OSI Certified is a 88 * certification mark of the Open Source Initiative. 89 */ 90 91 /* 92 * The contributing authors would like to thank all those who helped 93 * with testing, bug fixes, and patience. This wouldn't have been 94 * possible without all of you. 95 * 96 * Thanks to Frank J. T. Wojcik for helping with the documentation. 97 */ 98 99 /* 100 * The PNG Specification (Second Edition) is 101 * Copyright (c) 2003 W3C. (MIT, ERCIM, Keio), All Rights Reserved. 102 * Portable Network Graphics (PNG) Specification (Second Edition) 103 * Information technology - Computer graphics and image processing - 104 * Portable Network Graphics (PNG): Functional specification. 105 * ISO/IEC 15948:2003 (E) (November 10, 2003): David Duce and others. 106 */ 107 108 #ifndef PNG_H 109 #define PNG_H 110 111 /* This is not the place to learn how to use libpng. The manual libpng.3 112 * describes how to use libpng, and the file example.c summarizes it 113 * with some code on which to build. This file is useful for looking 114 * at the actual function definitions and structure components. 115 */ 116 117 /* Version information for png.h - this should match the version in png.c */ 118 #define PNG_LIBPNG_VER_STRING "1.2.50-MirOS" 119 #define PNG_HEADER_VERSION_STRING \ 120 " libpng version 1.2.50-MirOS - July 10, 2012\n" 121 122 #define PNG_LIBPNG_VER_SONUM 0 123 #define PNG_LIBPNG_VER_DLLNUM 13 124 125 /* These should match the first 3 components of PNG_LIBPNG_VER_STRING: */ 126 #define PNG_LIBPNG_VER_MAJOR 1 127 #define PNG_LIBPNG_VER_MINOR 2 128 #define PNG_LIBPNG_VER_RELEASE 50 129 /* This should match the numeric part of the final component of 130 * PNG_LIBPNG_VER_STRING, omitting any leading zero: 131 */ 132 133 #define PNG_LIBPNG_VER_BUILD 0 134 135 /* Release Status */ 136 #define PNG_LIBPNG_BUILD_ALPHA 1 137 #define PNG_LIBPNG_BUILD_BETA 2 138 #define PNG_LIBPNG_BUILD_RC 3 139 #define PNG_LIBPNG_BUILD_STABLE 4 140 #define PNG_LIBPNG_BUILD_RELEASE_STATUS_MASK 7 141 142 /* Release-Specific Flags */ 143 #define PNG_LIBPNG_BUILD_PATCH 8 /* Can be OR'ed with 144 PNG_LIBPNG_BUILD_STABLE only */ 145 #define PNG_LIBPNG_BUILD_PRIVATE 16 /* Cannot be OR'ed with 146 PNG_LIBPNG_BUILD_SPECIAL */ 147 #define PNG_LIBPNG_BUILD_SPECIAL 32 /* Cannot be OR'ed with 148 PNG_LIBPNG_BUILD_PRIVATE */ 149 150 #define PNG_LIBPNG_BUILD_BASE_TYPE PNG_LIBPNG_BUILD_STABLE 151 152 /* Careful here. At one time, Guy wanted to use 082, but that would be octal. 153 * We must not include leading zeros. 154 * Versions 0.7 through 1.0.0 were in the range 0 to 100 here (only 155 * version 1.0.0 was mis-numbered 100 instead of 10000). From 156 * version 1.0.1 it's xxyyzz, where x=major, y=minor, z=release 157 */ 158 #define PNG_LIBPNG_VER 10250 /* 1.2.50 */ 159 160 #ifndef PNG_VERSION_INFO_ONLY 161 /* Include the compression library's header */ 162 #include "zlib.h" 163 #endif 164 165 /* Include all user configurable info, including optional assembler routines */ 166 #include "pngconf.h" 167 168 /* 169 * Added at libpng-1.2.8 */ 170 /* Ref MSDN: Private as priority over Special 171 * VS_FF_PRIVATEBUILD File *was not* built using standard release 172 * procedures. If this value is given, the StringFileInfo block must 173 * contain a PrivateBuild string. 174 * 175 * VS_FF_SPECIALBUILD File *was* built by the original company using 176 * standard release procedures but is a variation of the standard 177 * file of the same version number. If this value is given, the 178 * StringFileInfo block must contain a SpecialBuild string. 179 */ 180 181 #ifdef PNG_USER_PRIVATEBUILD 182 # define PNG_LIBPNG_BUILD_TYPE \ 183 (PNG_LIBPNG_BUILD_BASE_TYPE | PNG_LIBPNG_BUILD_PRIVATE) 184 #else 185 # ifdef PNG_LIBPNG_SPECIALBUILD 186 # define PNG_LIBPNG_BUILD_TYPE \ 187 (PNG_LIBPNG_BUILD_BASE_TYPE | PNG_LIBPNG_BUILD_SPECIAL) 188 # else 189 # define PNG_LIBPNG_BUILD_TYPE (PNG_LIBPNG_BUILD_BASE_TYPE) 190 # endif 191 #endif 192 193 #ifndef PNG_VERSION_INFO_ONLY 194 195 /* Inhibit C++ name-mangling for libpng functions but not for system calls. */ 196 #ifdef __cplusplus 197 extern "C" { 198 #endif /* __cplusplus */ 199 200 /* This file is arranged in several sections. The first section contains 201 * structure and type definitions. The second section contains the external 202 * library functions, while the third has the internal library functions, 203 * which applications aren't expected to use directly. 204 */ 205 206 #ifndef PNG_NO_TYPECAST_NULL 207 #define int_p_NULL (int *)NULL 208 #define png_bytep_NULL (png_bytep)NULL 209 #define png_bytepp_NULL (png_bytepp)NULL 210 #define png_doublep_NULL (png_doublep)NULL 211 #define png_error_ptr_NULL (png_error_ptr)NULL 212 #define png_flush_ptr_NULL (png_flush_ptr)NULL 213 #define png_free_ptr_NULL (png_free_ptr)NULL 214 #define png_infopp_NULL (png_infopp)NULL 215 #define png_malloc_ptr_NULL (png_malloc_ptr)NULL 216 #define png_read_status_ptr_NULL (png_read_status_ptr)NULL 217 #define png_rw_ptr_NULL (png_rw_ptr)NULL 218 #define png_structp_NULL (png_structp)NULL 219 #define png_uint_16p_NULL (png_uint_16p)NULL 220 #define png_voidp_NULL (png_voidp)NULL 221 #define png_write_status_ptr_NULL (png_write_status_ptr)NULL 222 #else 223 #define int_p_NULL NULL 224 #define png_bytep_NULL NULL 225 #define png_bytepp_NULL NULL 226 #define png_doublep_NULL NULL 227 #define png_error_ptr_NULL NULL 228 #define png_flush_ptr_NULL NULL 229 #define png_free_ptr_NULL NULL 230 #define png_infopp_NULL NULL 231 #define png_malloc_ptr_NULL NULL 232 #define png_read_status_ptr_NULL NULL 233 #define png_rw_ptr_NULL NULL 234 #define png_structp_NULL NULL 235 #define png_uint_16p_NULL NULL 236 #define png_voidp_NULL NULL 237 #define png_write_status_ptr_NULL NULL 238 #endif 239 240 /* Variables declared in png.c - only it needs to define PNG_NO_EXTERN */ 241 #if !defined(PNG_NO_EXTERN) || defined(PNG_ALWAYS_EXTERN) 242 /* Version information for C files, stored in png.c. This had better match 243 * the version above. 244 */ 245 #ifdef PNG_USE_GLOBAL_ARRAYS 246 PNG_EXPORT_VAR (PNG_CONST char) png_libpng_ver[18]; 247 /* Need room for 99.99.99beta99z */ 248 #else 249 #define png_libpng_ver png_get_header_ver(NULL) 250 #endif 251 252 #ifdef PNG_USE_GLOBAL_ARRAYS 253 /* This was removed in version 1.0.5c */ 254 /* Structures to facilitate easy interlacing. See png.c for more details */ 255 PNG_EXPORT_VAR (PNG_CONST int FARDATA) png_pass_start[7]; 256 PNG_EXPORT_VAR (PNG_CONST int FARDATA) png_pass_inc[7]; 257 PNG_EXPORT_VAR (PNG_CONST int FARDATA) png_pass_ystart[7]; 258 PNG_EXPORT_VAR (PNG_CONST int FARDATA) png_pass_yinc[7]; 259 PNG_EXPORT_VAR (PNG_CONST int FARDATA) png_pass_mask[7]; 260 PNG_EXPORT_VAR (PNG_CONST int FARDATA) png_pass_dsp_mask[7]; 261 /* This isn't currently used. If you need it, see png.c for more details. 262 PNG_EXPORT_VAR (PNG_CONST int FARDATA) png_pass_height[7]; 263 */ 264 #endif 265 266 #endif /* PNG_NO_EXTERN */ 267 268 /* Three color definitions. The order of the red, green, and blue, (and the 269 * exact size) is not important, although the size of the fields need to 270 * be png_byte or png_uint_16 (as defined below). 271 */ 272 typedef struct png_color_struct 273 { 274 png_byte red; 275 png_byte green; 276 png_byte blue; 277 } png_color; 278 typedef png_color FAR * png_colorp; 279 typedef png_color FAR * FAR * png_colorpp; 280 281 typedef struct png_color_16_struct 282 { 283 png_byte index; /* used for palette files */ 284 png_uint_16 red; /* for use in red green blue files */ 285 png_uint_16 green; 286 png_uint_16 blue; 287 png_uint_16 gray; /* for use in grayscale files */ 288 } png_color_16; 289 typedef png_color_16 FAR * png_color_16p; 290 typedef png_color_16 FAR * FAR * png_color_16pp; 291 292 typedef struct png_color_8_struct 293 { 294 png_byte red; /* for use in red green blue files */ 295 png_byte green; 296 png_byte blue; 297 png_byte gray; /* for use in grayscale files */ 298 png_byte alpha; /* for alpha channel files */ 299 } png_color_8; 300 typedef png_color_8 FAR * png_color_8p; 301 typedef png_color_8 FAR * FAR * png_color_8pp; 302 303 /* 304 * The following two structures are used for the in-core representation 305 * of sPLT chunks. 306 */ 307 typedef struct png_sPLT_entry_struct 308 { 309 png_uint_16 red; 310 png_uint_16 green; 311 png_uint_16 blue; 312 png_uint_16 alpha; 313 png_uint_16 frequency; 314 } png_sPLT_entry; 315 typedef png_sPLT_entry FAR * png_sPLT_entryp; 316 typedef png_sPLT_entry FAR * FAR * png_sPLT_entrypp; 317 318 /* When the depth of the sPLT palette is 8 bits, the color and alpha samples 319 * occupy the LSB of their respective members, and the MSB of each member 320 * is zero-filled. The frequency member always occupies the full 16 bits. 321 */ 322 323 typedef struct png_sPLT_struct 324 { 325 png_charp name; /* palette name */ 326 png_byte depth; /* depth of palette samples */ 327 png_sPLT_entryp entries; /* palette entries */ 328 png_int_32 nentries; /* number of palette entries */ 329 } png_sPLT_t; 330 typedef png_sPLT_t FAR * png_sPLT_tp; 331 typedef png_sPLT_t FAR * FAR * png_sPLT_tpp; 332 333 #ifdef PNG_TEXT_SUPPORTED 334 /* png_text holds the contents of a text/ztxt/itxt chunk in a PNG file, 335 * and whether that contents is compressed or not. The "key" field 336 * points to a regular zero-terminated C string. The "text", "lang", and 337 * "lang_key" fields can be regular C strings, empty strings, or NULL pointers. 338 * However, the * structure returned by png_get_text() will always contain 339 * regular zero-terminated C strings (possibly empty), never NULL pointers, 340 * so they can be safely used in printf() and other string-handling functions. 341 */ 342 typedef struct png_text_struct 343 { 344 int compression; /* compression value: 345 -1: tEXt, none 346 0: zTXt, deflate 347 1: iTXt, none 348 2: iTXt, deflate */ 349 png_charp key; /* keyword, 1-79 character description of "text" */ 350 png_charp text; /* comment, may be an empty string (ie "") 351 or a NULL pointer */ 352 png_size_t text_length; /* length of the text string */ 353 #ifdef PNG_iTXt_SUPPORTED 354 png_size_t itxt_length; /* length of the itxt string */ 355 png_charp lang; /* language code, 0-79 characters 356 or a NULL pointer */ 357 png_charp lang_key; /* keyword translated UTF-8 string, 0 or more 358 chars or a NULL pointer */ 359 #endif 360 } png_text; 361 typedef png_text FAR * png_textp; 362 typedef png_text FAR * FAR * png_textpp; 363 #endif 364 365 /* Supported compression types for text in PNG files (tEXt, and zTXt). 366 * The values of the PNG_TEXT_COMPRESSION_ defines should NOT be changed. 367 */ 368 #define PNG_TEXT_COMPRESSION_NONE_WR -3 369 #define PNG_TEXT_COMPRESSION_zTXt_WR -2 370 #define PNG_TEXT_COMPRESSION_NONE -1 371 #define PNG_TEXT_COMPRESSION_zTXt 0 372 #define PNG_ITXT_COMPRESSION_NONE 1 373 #define PNG_ITXT_COMPRESSION_zTXt 2 374 #define PNG_TEXT_COMPRESSION_LAST 3 /* Not a valid value */ 375 376 /* png_time is a way to hold the time in an machine independent way. 377 * Two conversions are provided, both from time_t and struct tm. There 378 * is no portable way to convert to either of these structures, as far 379 * as I know. If you know of a portable way, send it to me. As a side 380 * note - PNG has always been Year 2000 compliant! 381 */ 382 typedef struct png_time_struct 383 { 384 png_uint_16 year; /* full year, as in, 1995 */ 385 png_byte month; /* month of year, 1 - 12 */ 386 png_byte day; /* day of month, 1 - 31 */ 387 png_byte hour; /* hour of day, 0 - 23 */ 388 png_byte minute; /* minute of hour, 0 - 59 */ 389 png_byte second; /* second of minute, 0 - 60 (for leap seconds) */ 390 } png_time; 391 typedef png_time FAR * png_timep; 392 typedef png_time FAR * FAR * png_timepp; 393 394 #if defined(PNG_UNKNOWN_CHUNKS_SUPPORTED) || \ 395 defined(PNG_HANDLE_AS_UNKNOWN_SUPPORTED) 396 /* png_unknown_chunk is a structure to hold queued chunks for which there is 397 * no specific support. The idea is that we can use this to queue 398 * up private chunks for output even though the library doesn't actually 399 * know about their semantics. 400 */ 401 #define PNG_CHUNK_NAME_LENGTH 5 402 typedef struct png_unknown_chunk_t 403 { 404 png_byte name[PNG_CHUNK_NAME_LENGTH]; 405 png_byte *data; 406 png_size_t size; 407 408 /* libpng-using applications should NOT directly modify this byte. */ 409 png_byte location; /* mode of operation at read time */ 410 } 411 png_unknown_chunk; 412 typedef png_unknown_chunk FAR * png_unknown_chunkp; 413 typedef png_unknown_chunk FAR * FAR * png_unknown_chunkpp; 414 #endif 415 416 /* png_info is a structure that holds the information in a PNG file so 417 * that the application can find out the characteristics of the image. 418 * If you are reading the file, this structure will tell you what is 419 * in the PNG file. If you are writing the file, fill in the information 420 * you want to put into the PNG file, then call png_write_info(). 421 * The names chosen should be very close to the PNG specification, so 422 * consult that document for information about the meaning of each field. 423 * 424 * With libpng < 0.95, it was only possible to directly set and read the 425 * the values in the png_info_struct, which meant that the contents and 426 * order of the values had to remain fixed. With libpng 0.95 and later, 427 * however, there are now functions that abstract the contents of 428 * png_info_struct from the application, so this makes it easier to use 429 * libpng with dynamic libraries, and even makes it possible to use 430 * libraries that don't have all of the libpng ancillary chunk-handing 431 * functionality. 432 * 433 * In any case, the order of the parameters in png_info_struct should NOT 434 * be changed for as long as possible to keep compatibility with applications 435 * that use the old direct-access method with png_info_struct. 436 * 437 * The following members may have allocated storage attached that should be 438 * cleaned up before the structure is discarded: palette, trans, text, 439 * pcal_purpose, pcal_units, pcal_params, hist, iccp_name, iccp_profile, 440 * splt_palettes, scal_unit, row_pointers, and unknowns. By default, these 441 * are automatically freed when the info structure is deallocated, if they were 442 * allocated internally by libpng. This behavior can be changed by means 443 * of the png_data_freer() function. 444 * 445 * More allocation details: all the chunk-reading functions that 446 * change these members go through the corresponding png_set_* 447 * functions. A function to clear these members is available: see 448 * png_free_data(). The png_set_* functions do not depend on being 449 * able to point info structure members to any of the storage they are 450 * passed (they make their own copies), EXCEPT that the png_set_text 451 * functions use the same storage passed to them in the text_ptr or 452 * itxt_ptr structure argument, and the png_set_rows and png_set_unknowns 453 * functions do not make their own copies. 454 */ 455 typedef struct png_info_struct 456 { 457 /* The following are necessary for every PNG file */ 458 png_uint_32 width PNG_DEPSTRUCT; /* width of image in pixels (from IHDR) */ 459 png_uint_32 height PNG_DEPSTRUCT; /* height of image in pixels (from IHDR) */ 460 png_uint_32 valid PNG_DEPSTRUCT; /* valid chunk data (see PNG_INFO_ below) */ 461 png_uint_32 rowbytes PNG_DEPSTRUCT; /* bytes needed to hold an untransformed row */ 462 png_colorp palette PNG_DEPSTRUCT; /* array of color values (valid & PNG_INFO_PLTE) */ 463 png_uint_16 num_palette PNG_DEPSTRUCT; /* number of color entries in "palette" (PLTE) */ 464 png_uint_16 num_trans PNG_DEPSTRUCT; /* number of transparent palette color (tRNS) */ 465 png_byte bit_depth PNG_DEPSTRUCT; /* 1, 2, 4, 8, or 16 bits/channel (from IHDR) */ 466 png_byte color_type PNG_DEPSTRUCT; /* see PNG_COLOR_TYPE_ below (from IHDR) */ 467 /* The following three should have been named *_method not *_type */ 468 png_byte compression_type PNG_DEPSTRUCT; /* must be PNG_COMPRESSION_TYPE_BASE (IHDR) */ 469 png_byte filter_type PNG_DEPSTRUCT; /* must be PNG_FILTER_TYPE_BASE (from IHDR) */ 470 png_byte interlace_type PNG_DEPSTRUCT; /* One of PNG_INTERLACE_NONE, PNG_INTERLACE_ADAM7 */ 471 472 /* The following is informational only on read, and not used on writes. */ 473 png_byte channels PNG_DEPSTRUCT; /* number of data channels per pixel (1, 2, 3, 4) */ 474 png_byte pixel_depth PNG_DEPSTRUCT; /* number of bits per pixel */ 475 png_byte spare_byte PNG_DEPSTRUCT; /* to align the data, and for future use */ 476 png_byte signature[8] PNG_DEPSTRUCT; /* magic bytes read by libpng from start of file */ 477 478 /* The rest of the data is optional. If you are reading, check the 479 * valid field to see if the information in these are valid. If you 480 * are writing, set the valid field to those chunks you want written, 481 * and initialize the appropriate fields below. 482 */ 483 484 #if defined(PNG_gAMA_SUPPORTED) && defined(PNG_FLOATING_POINT_SUPPORTED) 485 /* The gAMA chunk describes the gamma characteristics of the system 486 * on which the image was created, normally in the range [1.0, 2.5]. 487 * Data is valid if (valid & PNG_INFO_gAMA) is non-zero. 488 */ 489 float gamma PNG_DEPSTRUCT; /* gamma value of image, if (valid & PNG_INFO_gAMA) */ 490 #endif 491 492 #ifdef PNG_sRGB_SUPPORTED 493 /* GR-P, 0.96a */ 494 /* Data valid if (valid & PNG_INFO_sRGB) non-zero. */ 495 png_byte srgb_intent PNG_DEPSTRUCT; /* sRGB rendering intent [0, 1, 2, or 3] */ 496 #endif 497 498 #ifdef PNG_TEXT_SUPPORTED 499 /* The tEXt, and zTXt chunks contain human-readable textual data in 500 * uncompressed, compressed, and optionally compressed forms, respectively. 501 * The data in "text" is an array of pointers to uncompressed, 502 * null-terminated C strings. Each chunk has a keyword that describes the 503 * textual data contained in that chunk. Keywords are not required to be 504 * unique, and the text string may be empty. Any number of text chunks may 505 * be in an image. 506 */ 507 int num_text PNG_DEPSTRUCT; /* number of comments read/to write */ 508 int max_text PNG_DEPSTRUCT; /* current size of text array */ 509 png_textp text PNG_DEPSTRUCT; /* array of comments read/to write */ 510 #endif /* PNG_TEXT_SUPPORTED */ 511 512 #ifdef PNG_tIME_SUPPORTED 513 /* The tIME chunk holds the last time the displayed image data was 514 * modified. See the png_time struct for the contents of this struct. 515 */ 516 png_time mod_time PNG_DEPSTRUCT; 517 #endif 518 519 #ifdef PNG_sBIT_SUPPORTED 520 /* The sBIT chunk specifies the number of significant high-order bits 521 * in the pixel data. Values are in the range [1, bit_depth], and are 522 * only specified for the channels in the pixel data. The contents of 523 * the low-order bits is not specified. Data is valid if 524 * (valid & PNG_INFO_sBIT) is non-zero. 525 */ 526 png_color_8 sig_bit PNG_DEPSTRUCT; /* significant bits in color channels */ 527 #endif 528 529 #if defined(PNG_tRNS_SUPPORTED) || defined(PNG_READ_EXPAND_SUPPORTED) || \ 530 defined(PNG_READ_BACKGROUND_SUPPORTED) 531 /* The tRNS chunk supplies transparency data for paletted images and 532 * other image types that don't need a full alpha channel. There are 533 * "num_trans" transparency values for a paletted image, stored in the 534 * same order as the palette colors, starting from index 0. Values 535 * for the data are in the range [0, 255], ranging from fully transparent 536 * to fully opaque, respectively. For non-paletted images, there is a 537 * single color specified that should be treated as fully transparent. 538 * Data is valid if (valid & PNG_INFO_tRNS) is non-zero. 539 */ 540 png_bytep trans PNG_DEPSTRUCT; /* transparent values for paletted image */ 541 png_color_16 trans_values PNG_DEPSTRUCT; /* transparent color for non-palette image */ 542 #endif 543 544 #if defined(PNG_bKGD_SUPPORTED) || defined(PNG_READ_BACKGROUND_SUPPORTED) 545 /* The bKGD chunk gives the suggested image background color if the 546 * display program does not have its own background color and the image 547 * is needs to composited onto a background before display. The colors 548 * in "background" are normally in the same color space/depth as the 549 * pixel data. Data is valid if (valid & PNG_INFO_bKGD) is non-zero. 550 */ 551 png_color_16 background PNG_DEPSTRUCT; 552 #endif 553 554 #ifdef PNG_oFFs_SUPPORTED 555 /* The oFFs chunk gives the offset in "offset_unit_type" units rightwards 556 * and downwards from the top-left corner of the display, page, or other 557 * application-specific co-ordinate space. See the PNG_OFFSET_ defines 558 * below for the unit types. Valid if (valid & PNG_INFO_oFFs) non-zero. 559 */ 560 png_int_32 x_offset PNG_DEPSTRUCT; /* x offset on page */ 561 png_int_32 y_offset PNG_DEPSTRUCT; /* y offset on page */ 562 png_byte offset_unit_type PNG_DEPSTRUCT; /* offset units type */ 563 #endif 564 565 #ifdef PNG_pHYs_SUPPORTED 566 /* The pHYs chunk gives the physical pixel density of the image for 567 * display or printing in "phys_unit_type" units (see PNG_RESOLUTION_ 568 * defines below). Data is valid if (valid & PNG_INFO_pHYs) is non-zero. 569 */ 570 png_uint_32 x_pixels_per_unit PNG_DEPSTRUCT; /* horizontal pixel density */ 571 png_uint_32 y_pixels_per_unit PNG_DEPSTRUCT; /* vertical pixel density */ 572 png_byte phys_unit_type PNG_DEPSTRUCT; /* resolution type (see PNG_RESOLUTION_ below) */ 573 #endif 574 575 #ifdef PNG_hIST_SUPPORTED 576 /* The hIST chunk contains the relative frequency or importance of the 577 * various palette entries, so that a viewer can intelligently select a 578 * reduced-color palette, if required. Data is an array of "num_palette" 579 * values in the range [0,65535]. Data valid if (valid & PNG_INFO_hIST) 580 * is non-zero. 581 */ 582 png_uint_16p hist PNG_DEPSTRUCT; 583 #endif 584 585 #ifdef PNG_cHRM_SUPPORTED 586 /* The cHRM chunk describes the CIE color characteristics of the monitor 587 * on which the PNG was created. This data allows the viewer to do gamut 588 * mapping of the input image to ensure that the viewer sees the same 589 * colors in the image as the creator. Values are in the range 590 * [0.0, 0.8]. Data valid if (valid & PNG_INFO_cHRM) non-zero. 591 */ 592 #ifdef PNG_FLOATING_POINT_SUPPORTED 593 float x_white PNG_DEPSTRUCT; 594 float y_white PNG_DEPSTRUCT; 595 float x_red PNG_DEPSTRUCT; 596 float y_red PNG_DEPSTRUCT; 597 float x_green PNG_DEPSTRUCT; 598 float y_green PNG_DEPSTRUCT; 599 float x_blue PNG_DEPSTRUCT; 600 float y_blue PNG_DEPSTRUCT; 601 #endif 602 #endif 603 604 #ifdef PNG_pCAL_SUPPORTED 605 /* The pCAL chunk describes a transformation between the stored pixel 606 * values and original physical data values used to create the image. 607 * The integer range [0, 2^bit_depth - 1] maps to the floating-point 608 * range given by [pcal_X0, pcal_X1], and are further transformed by a 609 * (possibly non-linear) transformation function given by "pcal_type" 610 * and "pcal_params" into "pcal_units". Please see the PNG_EQUATION_ 611 * defines below, and the PNG-Group's PNG extensions document for a 612 * complete description of the transformations and how they should be 613 * implemented, and for a description of the ASCII parameter strings. 614 * Data values are valid if (valid & PNG_INFO_pCAL) non-zero. 615 */ 616 png_charp pcal_purpose PNG_DEPSTRUCT; /* pCAL chunk description string */ 617 png_int_32 pcal_X0 PNG_DEPSTRUCT; /* minimum value */ 618 png_int_32 pcal_X1 PNG_DEPSTRUCT; /* maximum value */ 619 png_charp pcal_units PNG_DEPSTRUCT; /* Latin-1 string giving physical units */ 620 png_charpp pcal_params PNG_DEPSTRUCT; /* ASCII strings containing parameter values */ 621 png_byte pcal_type PNG_DEPSTRUCT; /* equation type (see PNG_EQUATION_ below) */ 622 png_byte pcal_nparams PNG_DEPSTRUCT; /* number of parameters given in pcal_params */ 623 #endif 624 625 /* New members added in libpng-1.0.6 */ 626 #ifdef PNG_FREE_ME_SUPPORTED 627 png_uint_32 free_me PNG_DEPSTRUCT; /* flags items libpng is responsible for freeing */ 628 #endif 629 630 #if defined(PNG_UNKNOWN_CHUNKS_SUPPORTED) || \ 631 defined(PNG_HANDLE_AS_UNKNOWN_SUPPORTED) 632 /* Storage for unknown chunks that the library doesn't recognize. */ 633 png_unknown_chunkp unknown_chunks PNG_DEPSTRUCT; 634 png_size_t unknown_chunks_num PNG_DEPSTRUCT; 635 #endif 636 637 #ifdef PNG_iCCP_SUPPORTED 638 /* iCCP chunk data. */ 639 png_charp iccp_name PNG_DEPSTRUCT; /* profile name */ 640 png_charp iccp_profile PNG_DEPSTRUCT; /* International Color Consortium profile data */ 641 /* Note to maintainer: should be png_bytep */ 642 png_uint_32 iccp_proflen PNG_DEPSTRUCT; /* ICC profile data length */ 643 png_byte iccp_compression PNG_DEPSTRUCT; /* Always zero */ 644 #endif 645 646 #ifdef PNG_sPLT_SUPPORTED 647 /* Data on sPLT chunks (there may be more than one). */ 648 png_sPLT_tp splt_palettes PNG_DEPSTRUCT; 649 png_uint_32 splt_palettes_num PNG_DEPSTRUCT; 650 #endif 651 652 #ifdef PNG_sCAL_SUPPORTED 653 /* The sCAL chunk describes the actual physical dimensions of the 654 * subject matter of the graphic. The chunk contains a unit specification 655 * a byte value, and two ASCII strings representing floating-point 656 * values. The values are width and height corresponsing to one pixel 657 * in the image. This external representation is converted to double 658 * here. Data values are valid if (valid & PNG_INFO_sCAL) is non-zero. 659 */ 660 png_byte scal_unit PNG_DEPSTRUCT; /* unit of physical scale */ 661 #ifdef PNG_FLOATING_POINT_SUPPORTED 662 double scal_pixel_width PNG_DEPSTRUCT; /* width of one pixel */ 663 double scal_pixel_height PNG_DEPSTRUCT; /* height of one pixel */ 664 #endif 665 #ifdef PNG_FIXED_POINT_SUPPORTED 666 png_charp scal_s_width PNG_DEPSTRUCT; /* string containing height */ 667 png_charp scal_s_height PNG_DEPSTRUCT; /* string containing width */ 668 #endif 669 #endif 670 671 #ifdef PNG_INFO_IMAGE_SUPPORTED 672 /* Memory has been allocated if (valid & PNG_ALLOCATED_INFO_ROWS) non-zero */ 673 /* Data valid if (valid & PNG_INFO_IDAT) non-zero */ 674 png_bytepp row_pointers PNG_DEPSTRUCT; /* the image bits */ 675 #endif 676 677 #if defined(PNG_FIXED_POINT_SUPPORTED) && defined(PNG_gAMA_SUPPORTED) 678 png_fixed_point int_gamma PNG_DEPSTRUCT; /* gamma of image, if (valid & PNG_INFO_gAMA) */ 679 #endif 680 681 #if defined(PNG_cHRM_SUPPORTED) && defined(PNG_FIXED_POINT_SUPPORTED) 682 png_fixed_point int_x_white PNG_DEPSTRUCT; 683 png_fixed_point int_y_white PNG_DEPSTRUCT; 684 png_fixed_point int_x_red PNG_DEPSTRUCT; 685 png_fixed_point int_y_red PNG_DEPSTRUCT; 686 png_fixed_point int_x_green PNG_DEPSTRUCT; 687 png_fixed_point int_y_green PNG_DEPSTRUCT; 688 png_fixed_point int_x_blue PNG_DEPSTRUCT; 689 png_fixed_point int_y_blue PNG_DEPSTRUCT; 690 #endif 691 692 } png_info; 693 694 typedef png_info FAR * png_infop; 695 typedef png_info FAR * FAR * png_infopp; 696 697 /* Maximum positive integer used in PNG is (2^31)-1 */ 698 #define PNG_UINT_31_MAX ((png_uint_32)0x7fffffffL) 699 #define PNG_UINT_32_MAX ((png_uint_32)(-1)) 700 #define PNG_SIZE_MAX ((png_size_t)(-1)) 701 #if defined(PNG_1_0_X) || defined (PNG_1_2_X) 702 /* PNG_MAX_UINT is deprecated; use PNG_UINT_31_MAX instead. */ 703 #define PNG_MAX_UINT PNG_UINT_31_MAX 704 #endif 705 706 /* These describe the color_type field in png_info. */ 707 /* color type masks */ 708 #define PNG_COLOR_MASK_PALETTE 1 709 #define PNG_COLOR_MASK_COLOR 2 710 #define PNG_COLOR_MASK_ALPHA 4 711 712 /* color types. Note that not all combinations are legal */ 713 #define PNG_COLOR_TYPE_GRAY 0 714 #define PNG_COLOR_TYPE_PALETTE (PNG_COLOR_MASK_COLOR | PNG_COLOR_MASK_PALETTE) 715 #define PNG_COLOR_TYPE_RGB (PNG_COLOR_MASK_COLOR) 716 #define PNG_COLOR_TYPE_RGB_ALPHA (PNG_COLOR_MASK_COLOR | PNG_COLOR_MASK_ALPHA) 717 #define PNG_COLOR_TYPE_GRAY_ALPHA (PNG_COLOR_MASK_ALPHA) 718 /* aliases */ 719 #define PNG_COLOR_TYPE_RGBA PNG_COLOR_TYPE_RGB_ALPHA 720 #define PNG_COLOR_TYPE_GA PNG_COLOR_TYPE_GRAY_ALPHA 721 722 /* This is for compression type. PNG 1.0-1.2 only define the single type. */ 723 #define PNG_COMPRESSION_TYPE_BASE 0 /* Deflate method 8, 32K window */ 724 #define PNG_COMPRESSION_TYPE_DEFAULT PNG_COMPRESSION_TYPE_BASE 725 726 /* This is for filter type. PNG 1.0-1.2 only define the single type. */ 727 #define PNG_FILTER_TYPE_BASE 0 /* Single row per-byte filtering */ 728 #define PNG_INTRAPIXEL_DIFFERENCING 64 /* Used only in MNG datastreams */ 729 #define PNG_FILTER_TYPE_DEFAULT PNG_FILTER_TYPE_BASE 730 731 /* These are for the interlacing type. These values should NOT be changed. */ 732 #define PNG_INTERLACE_NONE 0 /* Non-interlaced image */ 733 #define PNG_INTERLACE_ADAM7 1 /* Adam7 interlacing */ 734 #define PNG_INTERLACE_LAST 2 /* Not a valid value */ 735 736 /* These are for the oFFs chunk. These values should NOT be changed. */ 737 #define PNG_OFFSET_PIXEL 0 /* Offset in pixels */ 738 #define PNG_OFFSET_MICROMETER 1 /* Offset in micrometers (1/10^6 meter) */ 739 #define PNG_OFFSET_LAST 2 /* Not a valid value */ 740 741 /* These are for the pCAL chunk. These values should NOT be changed. */ 742 #define PNG_EQUATION_LINEAR 0 /* Linear transformation */ 743 #define PNG_EQUATION_BASE_E 1 /* Exponential base e transform */ 744 #define PNG_EQUATION_ARBITRARY 2 /* Arbitrary base exponential transform */ 745 #define PNG_EQUATION_HYPERBOLIC 3 /* Hyperbolic sine transformation */ 746 #define PNG_EQUATION_LAST 4 /* Not a valid value */ 747 748 /* These are for the sCAL chunk. These values should NOT be changed. */ 749 #define PNG_SCALE_UNKNOWN 0 /* unknown unit (image scale) */ 750 #define PNG_SCALE_METER 1 /* meters per pixel */ 751 #define PNG_SCALE_RADIAN 2 /* radians per pixel */ 752 #define PNG_SCALE_LAST 3 /* Not a valid value */ 753 754 /* These are for the pHYs chunk. These values should NOT be changed. */ 755 #define PNG_RESOLUTION_UNKNOWN 0 /* pixels/unknown unit (aspect ratio) */ 756 #define PNG_RESOLUTION_METER 1 /* pixels/meter */ 757 #define PNG_RESOLUTION_LAST 2 /* Not a valid value */ 758 759 /* These are for the sRGB chunk. These values should NOT be changed. */ 760 #define PNG_sRGB_INTENT_PERCEPTUAL 0 761 #define PNG_sRGB_INTENT_RELATIVE 1 762 #define PNG_sRGB_INTENT_SATURATION 2 763 #define PNG_sRGB_INTENT_ABSOLUTE 3 764 #define PNG_sRGB_INTENT_LAST 4 /* Not a valid value */ 765 766 /* This is for text chunks */ 767 #define PNG_KEYWORD_MAX_LENGTH 79 768 769 /* Maximum number of entries in PLTE/sPLT/tRNS arrays */ 770 #define PNG_MAX_PALETTE_LENGTH 256 771 772 /* These determine if an ancillary chunk's data has been successfully read 773 * from the PNG header, or if the application has filled in the corresponding 774 * data in the info_struct to be written into the output file. The values 775 * of the PNG_INFO_<chunk> defines should NOT be changed. 776 */ 777 #define PNG_INFO_gAMA 0x0001 778 #define PNG_INFO_sBIT 0x0002 779 #define PNG_INFO_cHRM 0x0004 780 #define PNG_INFO_PLTE 0x0008 781 #define PNG_INFO_tRNS 0x0010 782 #define PNG_INFO_bKGD 0x0020 783 #define PNG_INFO_hIST 0x0040 784 #define PNG_INFO_pHYs 0x0080 785 #define PNG_INFO_oFFs 0x0100 786 #define PNG_INFO_tIME 0x0200 787 #define PNG_INFO_pCAL 0x0400 788 #define PNG_INFO_sRGB 0x0800 /* GR-P, 0.96a */ 789 #define PNG_INFO_iCCP 0x1000 /* ESR, 1.0.6 */ 790 #define PNG_INFO_sPLT 0x2000 /* ESR, 1.0.6 */ 791 #define PNG_INFO_sCAL 0x4000 /* ESR, 1.0.6 */ 792 #define PNG_INFO_IDAT 0x8000L /* ESR, 1.0.6 */ 793 794 /* This is used for the transformation routines, as some of them 795 * change these values for the row. It also should enable using 796 * the routines for other purposes. 797 */ 798 typedef struct png_row_info_struct 799 { 800 png_uint_32 width; /* width of row */ 801 png_uint_32 rowbytes; /* number of bytes in row */ 802 png_byte color_type; /* color type of row */ 803 png_byte bit_depth; /* bit depth of row */ 804 png_byte channels; /* number of channels (1, 2, 3, or 4) */ 805 png_byte pixel_depth; /* bits per pixel (depth * channels) */ 806 } png_row_info; 807 808 typedef png_row_info FAR * png_row_infop; 809 typedef png_row_info FAR * FAR * png_row_infopp; 810 811 /* These are the function types for the I/O functions and for the functions 812 * that allow the user to override the default I/O functions with his or her 813 * own. The png_error_ptr type should match that of user-supplied warning 814 * and error functions, while the png_rw_ptr type should match that of the 815 * user read/write data functions. 816 */ 817 typedef struct png_struct_def png_struct; 818 typedef png_struct FAR * png_structp; 819 820 typedef void (PNGAPI *png_error_ptr) PNGARG((png_structp, png_const_charp)); 821 typedef void (PNGAPI *png_rw_ptr) PNGARG((png_structp, png_bytep, png_size_t)); 822 typedef void (PNGAPI *png_flush_ptr) PNGARG((png_structp)); 823 typedef void (PNGAPI *png_read_status_ptr) PNGARG((png_structp, png_uint_32, 824 int)); 825 typedef void (PNGAPI *png_write_status_ptr) PNGARG((png_structp, png_uint_32, 826 int)); 827 828 #ifdef PNG_PROGRESSIVE_READ_SUPPORTED 829 typedef void (PNGAPI *png_progressive_info_ptr) PNGARG((png_structp, png_infop)); 830 typedef void (PNGAPI *png_progressive_end_ptr) PNGARG((png_structp, png_infop)); 831 typedef void (PNGAPI *png_progressive_row_ptr) PNGARG((png_structp, png_bytep, 832 png_uint_32, int)); 833 #endif 834 835 #if defined(PNG_READ_USER_TRANSFORM_SUPPORTED) || \ 836 defined(PNG_WRITE_USER_TRANSFORM_SUPPORTED) || \ 837 defined(PNG_LEGACY_SUPPORTED) 838 typedef void (PNGAPI *png_user_transform_ptr) PNGARG((png_structp, 839 png_row_infop, png_bytep)); 840 #endif 841 842 #ifdef PNG_USER_CHUNKS_SUPPORTED 843 typedef int (PNGAPI *png_user_chunk_ptr) PNGARG((png_structp, png_unknown_chunkp)); 844 #endif 845 #ifdef PNG_UNKNOWN_CHUNKS_SUPPORTED 846 typedef void (PNGAPI *png_unknown_chunk_ptr) PNGARG((png_structp)); 847 #endif 848 849 /* Transform masks for the high-level interface */ 850 #define PNG_TRANSFORM_IDENTITY 0x0000 /* read and write */ 851 #define PNG_TRANSFORM_STRIP_16 0x0001 /* read only */ 852 #define PNG_TRANSFORM_STRIP_ALPHA 0x0002 /* read only */ 853 #define PNG_TRANSFORM_PACKING 0x0004 /* read and write */ 854 #define PNG_TRANSFORM_PACKSWAP 0x0008 /* read and write */ 855 #define PNG_TRANSFORM_EXPAND 0x0010 /* read only */ 856 #define PNG_TRANSFORM_INVERT_MONO 0x0020 /* read and write */ 857 #define PNG_TRANSFORM_SHIFT 0x0040 /* read and write */ 858 #define PNG_TRANSFORM_BGR 0x0080 /* read and write */ 859 #define PNG_TRANSFORM_SWAP_ALPHA 0x0100 /* read and write */ 860 #define PNG_TRANSFORM_SWAP_ENDIAN 0x0200 /* read and write */ 861 #define PNG_TRANSFORM_INVERT_ALPHA 0x0400 /* read and write */ 862 #define PNG_TRANSFORM_STRIP_FILLER 0x0800 /* write only, deprecated */ 863 /* Added to libpng-1.2.34 */ 864 #define PNG_TRANSFORM_STRIP_FILLER_BEFORE 0x0800 /* write only */ 865 #define PNG_TRANSFORM_STRIP_FILLER_AFTER 0x1000 /* write only */ 866 /* Added to libpng-1.2.41 */ 867 #define PNG_TRANSFORM_GRAY_TO_RGB 0x2000 /* read only */ 868 869 /* Flags for MNG supported features */ 870 #define PNG_FLAG_MNG_EMPTY_PLTE 0x01 871 #define PNG_FLAG_MNG_FILTER_64 0x04 872 #define PNG_ALL_MNG_FEATURES 0x05 873 874 typedef png_voidp (*png_malloc_ptr) PNGARG((png_structp, png_size_t)); 875 typedef void (*png_free_ptr) PNGARG((png_structp, png_voidp)); 876 877 /* The structure that holds the information to read and write PNG files. 878 * The only people who need to care about what is inside of this are the 879 * people who will be modifying the library for their own special needs. 880 * It should NOT be accessed directly by an application, except to store 881 * the jmp_buf. 882 */ 883 884 struct png_struct_def 885 { 886 #ifdef PNG_SETJMP_SUPPORTED 887 jmp_buf jmpbuf; /* used in png_error */ 888 #endif 889 png_error_ptr error_fn PNG_DEPSTRUCT; /* function for printing errors and aborting */ 890 png_error_ptr warning_fn PNG_DEPSTRUCT; /* function for printing warnings */ 891 png_voidp error_ptr PNG_DEPSTRUCT; /* user supplied struct for error functions */ 892 png_rw_ptr write_data_fn PNG_DEPSTRUCT; /* function for writing output data */ 893 png_rw_ptr read_data_fn PNG_DEPSTRUCT; /* function for reading input data */ 894 png_voidp io_ptr PNG_DEPSTRUCT; /* ptr to application struct for I/O functions */ 895 896 #ifdef PNG_READ_USER_TRANSFORM_SUPPORTED 897 png_user_transform_ptr read_user_transform_fn PNG_DEPSTRUCT; /* user read transform */ 898 #endif 899 900 #ifdef PNG_WRITE_USER_TRANSFORM_SUPPORTED 901 png_user_transform_ptr write_user_transform_fn PNG_DEPSTRUCT; /* user write transform */ 902 #endif 903 904 /* These were added in libpng-1.0.2 */ 905 #ifdef PNG_USER_TRANSFORM_PTR_SUPPORTED 906 #if defined(PNG_READ_USER_TRANSFORM_SUPPORTED) || \ 907 defined(PNG_WRITE_USER_TRANSFORM_SUPPORTED) 908 png_voidp user_transform_ptr PNG_DEPSTRUCT; /* user supplied struct for user transform */ 909 png_byte user_transform_depth PNG_DEPSTRUCT; /* bit depth of user transformed pixels */ 910 png_byte user_transform_channels PNG_DEPSTRUCT; /* channels in user transformed pixels */ 911 #endif 912 #endif 913 914 png_uint_32 mode PNG_DEPSTRUCT; /* tells us where we are in the PNG file */ 915 png_uint_32 flags PNG_DEPSTRUCT; /* flags indicating various things to libpng */ 916 png_uint_32 transformations PNG_DEPSTRUCT; /* which transformations to perform */ 917 918 z_stream zstream PNG_DEPSTRUCT; /* pointer to decompression structure (below) */ 919 png_bytep zbuf PNG_DEPSTRUCT; /* buffer for zlib */ 920 png_size_t zbuf_size PNG_DEPSTRUCT; /* size of zbuf */ 921 int zlib_level PNG_DEPSTRUCT; /* holds zlib compression level */ 922 int zlib_method PNG_DEPSTRUCT; /* holds zlib compression method */ 923 int zlib_window_bits PNG_DEPSTRUCT; /* holds zlib compression window bits */ 924 int zlib_mem_level PNG_DEPSTRUCT; /* holds zlib compression memory level */ 925 int zlib_strategy PNG_DEPSTRUCT; /* holds zlib compression strategy */ 926 927 png_uint_32 width PNG_DEPSTRUCT; /* width of image in pixels */ 928 png_uint_32 height PNG_DEPSTRUCT; /* height of image in pixels */ 929 png_uint_32 num_rows PNG_DEPSTRUCT; /* number of rows in current pass */ 930 png_uint_32 usr_width PNG_DEPSTRUCT; /* width of row at start of write */ 931 png_uint_32 rowbytes PNG_DEPSTRUCT; /* size of row in bytes */ 932 #if 0 /* Replaced with the following in libpng-1.2.43 */ 933 png_size_t irowbytes PNG_DEPSTRUCT; 934 #endif 935 /* Added in libpng-1.2.43 */ 936 #ifdef PNG_USER_LIMITS_SUPPORTED 937 /* Added in libpng-1.4.0: Total number of sPLT, text, and unknown 938 * chunks that can be stored (0 means unlimited). 939 */ 940 png_uint_32 user_chunk_cache_max PNG_DEPSTRUCT; 941 #endif 942 png_uint_32 iwidth PNG_DEPSTRUCT; /* width of current interlaced row in pixels */ 943 png_uint_32 row_number PNG_DEPSTRUCT; /* current row in interlace pass */ 944 png_bytep prev_row PNG_DEPSTRUCT; /* buffer to save previous (unfiltered) row */ 945 png_bytep row_buf PNG_DEPSTRUCT; /* buffer to save current (unfiltered) row */ 946 #ifndef PNG_NO_WRITE_FILTER 947 png_bytep sub_row PNG_DEPSTRUCT; /* buffer to save "sub" row when filtering */ 948 png_bytep up_row PNG_DEPSTRUCT; /* buffer to save "up" row when filtering */ 949 png_bytep avg_row PNG_DEPSTRUCT; /* buffer to save "avg" row when filtering */ 950 png_bytep paeth_row PNG_DEPSTRUCT; /* buffer to save "Paeth" row when filtering */ 951 #endif 952 png_row_info row_info PNG_DEPSTRUCT; /* used for transformation routines */ 953 954 png_uint_32 idat_size PNG_DEPSTRUCT; /* current IDAT size for read */ 955 png_uint_32 crc PNG_DEPSTRUCT; /* current chunk CRC value */ 956 png_colorp palette PNG_DEPSTRUCT; /* palette from the input file */ 957 png_uint_16 num_palette PNG_DEPSTRUCT; /* number of color entries in palette */ 958 png_uint_16 num_trans PNG_DEPSTRUCT; /* number of transparency values */ 959 png_byte chunk_name[5] PNG_DEPSTRUCT; /* null-terminated name of current chunk */ 960 png_byte compression PNG_DEPSTRUCT; /* file compression type (always 0) */ 961 png_byte filter PNG_DEPSTRUCT; /* file filter type (always 0) */ 962 png_byte interlaced PNG_DEPSTRUCT; /* PNG_INTERLACE_NONE, PNG_INTERLACE_ADAM7 */ 963 png_byte pass PNG_DEPSTRUCT; /* current interlace pass (0 - 6) */ 964 png_byte do_filter PNG_DEPSTRUCT; /* row filter flags (see PNG_FILTER_ below ) */ 965 png_byte color_type PNG_DEPSTRUCT; /* color type of file */ 966 png_byte bit_depth PNG_DEPSTRUCT; /* bit depth of file */ 967 png_byte usr_bit_depth PNG_DEPSTRUCT; /* bit depth of users row */ 968 png_byte pixel_depth PNG_DEPSTRUCT; /* number of bits per pixel */ 969 png_byte channels PNG_DEPSTRUCT; /* number of channels in file */ 970 png_byte usr_channels PNG_DEPSTRUCT; /* channels at start of write */ 971 png_byte sig_bytes PNG_DEPSTRUCT; /* magic bytes read/written from start of file */ 972 973 #if defined(PNG_READ_FILLER_SUPPORTED) || defined(PNG_WRITE_FILLER_SUPPORTED) 974 #ifdef PNG_LEGACY_SUPPORTED 975 png_byte filler PNG_DEPSTRUCT; /* filler byte for pixel expansion */ 976 #else 977 png_uint_16 filler PNG_DEPSTRUCT; /* filler bytes for pixel expansion */ 978 #endif 979 #endif 980 981 #ifdef PNG_bKGD_SUPPORTED 982 png_byte background_gamma_type PNG_DEPSTRUCT; 983 # ifdef PNG_FLOATING_POINT_SUPPORTED 984 float background_gamma PNG_DEPSTRUCT; 985 # endif 986 png_color_16 background PNG_DEPSTRUCT; /* background color in screen gamma space */ 987 #ifdef PNG_READ_GAMMA_SUPPORTED 988 png_color_16 background_1 PNG_DEPSTRUCT; /* background normalized to gamma 1.0 */ 989 #endif 990 #endif /* PNG_bKGD_SUPPORTED */ 991 992 #ifdef PNG_WRITE_FLUSH_SUPPORTED 993 png_flush_ptr output_flush_fn PNG_DEPSTRUCT; /* Function for flushing output */ 994 png_uint_32 flush_dist PNG_DEPSTRUCT; /* how many rows apart to flush, 0 - no flush */ 995 png_uint_32 flush_rows PNG_DEPSTRUCT; /* number of rows written since last flush */ 996 #endif 997 998 #if defined(PNG_READ_GAMMA_SUPPORTED) || defined(PNG_READ_BACKGROUND_SUPPORTED) 999 int gamma_shift PNG_DEPSTRUCT; /* number of "insignificant" bits 16-bit gamma */ 1000 #ifdef PNG_FLOATING_POINT_SUPPORTED 1001 float gamma PNG_DEPSTRUCT; /* file gamma value */ 1002 float screen_gamma PNG_DEPSTRUCT; /* screen gamma value (display_exponent) */ 1003 #endif 1004 #endif 1005 1006 #if defined(PNG_READ_GAMMA_SUPPORTED) || defined(PNG_READ_BACKGROUND_SUPPORTED) 1007 png_bytep gamma_table PNG_DEPSTRUCT; /* gamma table for 8-bit depth files */ 1008 png_bytep gamma_from_1 PNG_DEPSTRUCT; /* converts from 1.0 to screen */ 1009 png_bytep gamma_to_1 PNG_DEPSTRUCT; /* converts from file to 1.0 */ 1010 png_uint_16pp gamma_16_table PNG_DEPSTRUCT; /* gamma table for 16-bit depth files */ 1011 png_uint_16pp gamma_16_from_1 PNG_DEPSTRUCT; /* converts from 1.0 to screen */ 1012 png_uint_16pp gamma_16_to_1 PNG_DEPSTRUCT; /* converts from file to 1.0 */ 1013 #endif 1014 1015 #if defined(PNG_READ_GAMMA_SUPPORTED) || defined(PNG_sBIT_SUPPORTED) 1016 png_color_8 sig_bit PNG_DEPSTRUCT; /* significant bits in each available channel */ 1017 #endif 1018 1019 #if defined(PNG_READ_SHIFT_SUPPORTED) || defined(PNG_WRITE_SHIFT_SUPPORTED) 1020 png_color_8 shift PNG_DEPSTRUCT; /* shift for significant bit tranformation */ 1021 #endif 1022 1023 #if defined(PNG_tRNS_SUPPORTED) || defined(PNG_READ_BACKGROUND_SUPPORTED) \ 1024 || defined(PNG_READ_EXPAND_SUPPORTED) || defined(PNG_READ_BACKGROUND_SUPPORTED) 1025 png_bytep trans PNG_DEPSTRUCT; /* transparency values for paletted files */ 1026 png_color_16 trans_values PNG_DEPSTRUCT; /* transparency values for non-paletted files */ 1027 #endif 1028 1029 png_read_status_ptr read_row_fn PNG_DEPSTRUCT; /* called after each row is decoded */ 1030 png_write_status_ptr write_row_fn PNG_DEPSTRUCT; /* called after each row is encoded */ 1031 #ifdef PNG_PROGRESSIVE_READ_SUPPORTED 1032 png_progressive_info_ptr info_fn PNG_DEPSTRUCT; /* called after header data fully read */ 1033 png_progressive_row_ptr row_fn PNG_DEPSTRUCT; /* called after each prog. row is decoded */ 1034 png_progressive_end_ptr end_fn PNG_DEPSTRUCT; /* called after image is complete */ 1035 png_bytep save_buffer_ptr PNG_DEPSTRUCT; /* current location in save_buffer */ 1036 png_bytep save_buffer PNG_DEPSTRUCT; /* buffer for previously read data */ 1037 png_bytep current_buffer_ptr PNG_DEPSTRUCT; /* current location in current_buffer */ 1038 png_bytep current_buffer PNG_DEPSTRUCT; /* buffer for recently used data */ 1039 png_uint_32 push_length PNG_DEPSTRUCT; /* size of current input chunk */ 1040 png_uint_32 skip_length PNG_DEPSTRUCT; /* bytes to skip in input data */ 1041 png_size_t save_buffer_size PNG_DEPSTRUCT; /* amount of data now in save_buffer */ 1042 png_size_t save_buffer_max PNG_DEPSTRUCT; /* total size of save_buffer */ 1043 png_size_t buffer_size PNG_DEPSTRUCT; /* total amount of available input data */ 1044 png_size_t current_buffer_size PNG_DEPSTRUCT; /* amount of data now in current_buffer */ 1045 int process_mode PNG_DEPSTRUCT; /* what push library is currently doing */ 1046 int cur_palette PNG_DEPSTRUCT; /* current push library palette index */ 1047 1048 # ifdef PNG_TEXT_SUPPORTED 1049 png_size_t current_text_size PNG_DEPSTRUCT; /* current size of text input data */ 1050 png_size_t current_text_left PNG_DEPSTRUCT; /* how much text left to read in input */ 1051 png_charp current_text PNG_DEPSTRUCT; /* current text chunk buffer */ 1052 png_charp current_text_ptr PNG_DEPSTRUCT; /* current location in current_text */ 1053 # endif /* PNG_TEXT_SUPPORTED */ 1054 #endif /* PNG_PROGRESSIVE_READ_SUPPORTED */ 1055 1056 #if defined(__TURBOC__) && !defined(_Windows) && !defined(__FLAT__) 1057 /* for the Borland special 64K segment handler */ 1058 png_bytepp offset_table_ptr PNG_DEPSTRUCT; 1059 png_bytep offset_table PNG_DEPSTRUCT; 1060 png_uint_16 offset_table_number PNG_DEPSTRUCT; 1061 png_uint_16 offset_table_count PNG_DEPSTRUCT; 1062 png_uint_16 offset_table_count_free PNG_DEPSTRUCT; 1063 #endif 1064 1065 #ifdef PNG_READ_DITHER_SUPPORTED 1066 png_bytep palette_lookup PNG_DEPSTRUCT; /* lookup table for dithering */ 1067 png_bytep dither_index PNG_DEPSTRUCT; /* index translation for palette files */ 1068 #endif 1069 1070 #if defined(PNG_READ_DITHER_SUPPORTED) || defined(PNG_hIST_SUPPORTED) 1071 png_uint_16p hist PNG_DEPSTRUCT; /* histogram */ 1072 #endif 1073 1074 #ifdef PNG_WRITE_WEIGHTED_FILTER_SUPPORTED 1075 png_byte heuristic_method PNG_DEPSTRUCT; /* heuristic for row filter selection */ 1076 png_byte num_prev_filters PNG_DEPSTRUCT; /* number of weights for previous rows */ 1077 png_bytep prev_filters PNG_DEPSTRUCT; /* filter type(s) of previous row(s) */ 1078 png_uint_16p filter_weights PNG_DEPSTRUCT; /* weight(s) for previous line(s) */ 1079 png_uint_16p inv_filter_weights PNG_DEPSTRUCT; /* 1/weight(s) for previous line(s) */ 1080 png_uint_16p filter_costs PNG_DEPSTRUCT; /* relative filter calculation cost */ 1081 png_uint_16p inv_filter_costs PNG_DEPSTRUCT; /* 1/relative filter calculation cost */ 1082 #endif 1083 1084 #ifdef PNG_TIME_RFC1123_SUPPORTED 1085 png_charp time_buffer PNG_DEPSTRUCT; /* String to hold RFC 1123 time text */ 1086 #endif 1087 1088 /* New members added in libpng-1.0.6 */ 1089 1090 #ifdef PNG_FREE_ME_SUPPORTED 1091 png_uint_32 free_me PNG_DEPSTRUCT; /* flags items libpng is responsible for freeing */ 1092 #endif 1093 1094 #ifdef PNG_USER_CHUNKS_SUPPORTED 1095 png_voidp user_chunk_ptr PNG_DEPSTRUCT; 1096 png_user_chunk_ptr read_user_chunk_fn PNG_DEPSTRUCT; /* user read chunk handler */ 1097 #endif 1098 1099 #ifdef PNG_HANDLE_AS_UNKNOWN_SUPPORTED 1100 int num_chunk_list PNG_DEPSTRUCT; 1101 png_bytep chunk_list PNG_DEPSTRUCT; 1102 #endif 1103 1104 /* New members added in libpng-1.0.3 */ 1105 #ifdef PNG_READ_RGB_TO_GRAY_SUPPORTED 1106 png_byte rgb_to_gray_status PNG_DEPSTRUCT; 1107 /* These were changed from png_byte in libpng-1.0.6 */ 1108 png_uint_16 rgb_to_gray_red_coeff PNG_DEPSTRUCT; 1109 png_uint_16 rgb_to_gray_green_coeff PNG_DEPSTRUCT; 1110 png_uint_16 rgb_to_gray_blue_coeff PNG_DEPSTRUCT; 1111 #endif 1112 1113 /* New member added in libpng-1.0.4 (renamed in 1.0.9) */ 1114 #if defined(PNG_MNG_FEATURES_SUPPORTED) || \ 1115 defined(PNG_READ_EMPTY_PLTE_SUPPORTED) || \ 1116 defined(PNG_WRITE_EMPTY_PLTE_SUPPORTED) 1117 /* Changed from png_byte to png_uint_32 at version 1.2.0 */ 1118 #ifdef PNG_1_0_X 1119 png_byte mng_features_permitted PNG_DEPSTRUCT; 1120 #else 1121 png_uint_32 mng_features_permitted PNG_DEPSTRUCT; 1122 #endif /* PNG_1_0_X */ 1123 #endif 1124 1125 /* New member added in libpng-1.0.7 */ 1126 #if defined(PNG_READ_GAMMA_SUPPORTED) || defined(PNG_READ_BACKGROUND_SUPPORTED) 1127 png_fixed_point int_gamma PNG_DEPSTRUCT; 1128 #endif 1129 1130 /* New member added in libpng-1.0.9, ifdef'ed out in 1.0.12, enabled in 1.2.0 */ 1131 #ifdef PNG_MNG_FEATURES_SUPPORTED 1132 png_byte filter_type PNG_DEPSTRUCT; 1133 #endif 1134 1135 #ifdef PNG_1_0_X 1136 /* New member added in libpng-1.0.10, ifdef'ed out in 1.2.0 */ 1137 png_uint_32 row_buf_size PNG_DEPSTRUCT; 1138 #endif 1139 1140 /* New members added in libpng-1.0.2 but first enabled by default in 1.2.0 */ 1141 #ifdef PNG_USER_MEM_SUPPORTED 1142 png_voidp mem_ptr PNG_DEPSTRUCT; /* user supplied struct for mem functions */ 1143 png_malloc_ptr malloc_fn PNG_DEPSTRUCT; /* function for allocating memory */ 1144 png_free_ptr free_fn PNG_DEPSTRUCT; /* function for freeing memory */ 1145 #endif 1146 1147 /* New member added in libpng-1.0.13 and 1.2.0 */ 1148 png_bytep big_row_buf PNG_DEPSTRUCT; /* buffer to save current (unfiltered) row */ 1149 1150 #ifdef PNG_READ_DITHER_SUPPORTED 1151 /* The following three members were added at version 1.0.14 and 1.2.4 */ 1152 png_bytep dither_sort PNG_DEPSTRUCT; /* working sort array */ 1153 png_bytep index_to_palette PNG_DEPSTRUCT; /* where the original index currently is */ 1154 /* in the palette */ 1155 png_bytep palette_to_index PNG_DEPSTRUCT; /* which original index points to this */ 1156 /* palette color */ 1157 #endif 1158 1159 /* New members added in libpng-1.0.16 and 1.2.6 */ 1160 png_byte compression_type PNG_DEPSTRUCT; 1161 1162 #ifdef PNG_USER_LIMITS_SUPPORTED 1163 png_uint_32 user_width_max PNG_DEPSTRUCT; 1164 png_uint_32 user_height_max PNG_DEPSTRUCT; 1165 #endif 1166 1167 /* New member added in libpng-1.0.25 and 1.2.17 */ 1168 #ifdef PNG_UNKNOWN_CHUNKS_SUPPORTED 1169 /* Storage for unknown chunk that the library doesn't recognize. */ 1170 png_unknown_chunk unknown_chunk PNG_DEPSTRUCT; 1171 #endif 1172 1173 /* New members added in libpng-1.2.26 */ 1174 png_uint_32 old_big_row_buf_size PNG_DEPSTRUCT; 1175 png_uint_32 old_prev_row_size PNG_DEPSTRUCT; 1176 1177 /* New member added in libpng-1.2.30 */ 1178 png_charp chunkdata PNG_DEPSTRUCT; /* buffer for reading chunk data */ 1179 1180 1181 }; 1182 1183 1184 /* This triggers a compiler error in png.c, if png.c and png.h 1185 * do not agree upon the version number. 1186 */ 1187 typedef png_structp version_1_2_50; 1188 1189 typedef png_struct FAR * FAR * png_structpp; 1190 1191 /* Here are the function definitions most commonly used. This is not 1192 * the place to find out how to use libpng. See libpng.txt for the 1193 * full explanation, see example.c for the summary. This just provides 1194 * a simple one line description of the use of each function. 1195 */ 1196 1197 /* Returns the version number of the library */ 1198 extern PNG_EXPORT(png_uint_32,png_access_version_number) PNGARG((void)); 1199 1200 /* Tell lib we have already handled the first <num_bytes> magic bytes. 1201 * Handling more than 8 bytes from the beginning of the file is an error. 1202 */ 1203 extern PNG_EXPORT(void,png_set_sig_bytes) PNGARG((png_structp png_ptr, 1204 int num_bytes)); 1205 1206 /* Check sig[start] through sig[start + num_to_check - 1] to see if it's a 1207 * PNG file. Returns zero if the supplied bytes match the 8-byte PNG 1208 * signature, and non-zero otherwise. Having num_to_check == 0 or 1209 * start > 7 will always fail (ie return non-zero). 1210 */ 1211 extern PNG_EXPORT(int,png_sig_cmp) PNGARG((png_bytep sig, png_size_t start, 1212 png_size_t num_to_check)); 1213 1214 /* Simple signature checking function. This is the same as calling 1215 * png_check_sig(sig, n) := !png_sig_cmp(sig, 0, n). 1216 */ 1217 extern PNG_EXPORT(int,png_check_sig) PNGARG((png_bytep sig, int num)) PNG_DEPRECATED; 1218 1219 /* Allocate and initialize png_ptr struct for reading, and any other memory. */ 1220 extern PNG_EXPORT(png_structp,png_create_read_struct) 1221 PNGARG((png_const_charp user_png_ver, png_voidp error_ptr, 1222 png_error_ptr error_fn, png_error_ptr warn_fn)) PNG_ALLOCATED; 1223 1224 /* Allocate and initialize png_ptr struct for writing, and any other memory */ 1225 extern PNG_EXPORT(png_structp,png_create_write_struct) 1226 PNGARG((png_const_charp user_png_ver, png_voidp error_ptr, 1227 png_error_ptr error_fn, png_error_ptr warn_fn)) PNG_ALLOCATED; 1228 1229 #ifdef PNG_WRITE_SUPPORTED 1230 extern PNG_EXPORT(png_uint_32,png_get_compression_buffer_size) 1231 PNGARG((png_structp png_ptr)); 1232 #endif 1233 1234 #ifdef PNG_WRITE_SUPPORTED 1235 extern PNG_EXPORT(void,png_set_compression_buffer_size) 1236 PNGARG((png_structp png_ptr, png_uint_32 size)); 1237 #endif 1238 1239 /* Reset the compression stream */ 1240 extern PNG_EXPORT(int,png_reset_zstream) PNGARG((png_structp png_ptr)); 1241 1242 /* New functions added in libpng-1.0.2 (not enabled by default until 1.2.0) */ 1243 #ifdef PNG_USER_MEM_SUPPORTED 1244 extern PNG_EXPORT(png_structp,png_create_read_struct_2) 1245 PNGARG((png_const_charp user_png_ver, png_voidp error_ptr, 1246 png_error_ptr error_fn, png_error_ptr warn_fn, png_voidp mem_ptr, 1247 png_malloc_ptr malloc_fn, png_free_ptr free_fn)) PNG_ALLOCATED; 1248 extern PNG_EXPORT(png_structp,png_create_write_struct_2) 1249 PNGARG((png_const_charp user_png_ver, png_voidp error_ptr, 1250 png_error_ptr error_fn, png_error_ptr warn_fn, png_voidp mem_ptr, 1251 png_malloc_ptr malloc_fn, png_free_ptr free_fn)) PNG_ALLOCATED; 1252 #endif 1253 1254 /* Write a PNG chunk - size, type, (optional) data, CRC. */ 1255 extern PNG_EXPORT(void,png_write_chunk) PNGARG((png_structp png_ptr, 1256 png_bytep chunk_name, png_bytep data, png_size_t length)); 1257 1258 /* Write the start of a PNG chunk - length and chunk name. */ 1259 extern PNG_EXPORT(void,png_write_chunk_start) PNGARG((png_structp png_ptr, 1260 png_bytep chunk_name, png_uint_32 length)); 1261 1262 /* Write the data of a PNG chunk started with png_write_chunk_start(). */ 1263 extern PNG_EXPORT(void,png_write_chunk_data) PNGARG((png_structp png_ptr, 1264 png_bytep data, png_size_t length)); 1265 1266 /* Finish a chunk started with png_write_chunk_start() (includes CRC). */ 1267 extern PNG_EXPORT(void,png_write_chunk_end) PNGARG((png_structp png_ptr)); 1268 1269 /* Allocate and initialize the info structure */ 1270 extern PNG_EXPORT(png_infop,png_create_info_struct) 1271 PNGARG((png_structp png_ptr)) PNG_ALLOCATED; 1272 1273 #if defined(PNG_1_0_X) || defined (PNG_1_2_X) 1274 /* Initialize the info structure (old interface - DEPRECATED) */ 1275 extern PNG_EXPORT(void,png_info_init) PNGARG((png_infop info_ptr)) 1276 PNG_DEPRECATED; 1277 #undef png_info_init 1278 #define png_info_init(info_ptr) png_info_init_3(&info_ptr,\ 1279 png_sizeof(png_info)); 1280 #endif 1281 1282 extern PNG_EXPORT(void,png_info_init_3) PNGARG((png_infopp info_ptr, 1283 png_size_t png_info_struct_size)); 1284 1285 /* Writes all the PNG information before the image. */ 1286 extern PNG_EXPORT(void,png_write_info_before_PLTE) PNGARG((png_structp png_ptr, 1287 png_infop info_ptr)); 1288 extern PNG_EXPORT(void,png_write_info) PNGARG((png_structp png_ptr, 1289 png_infop info_ptr)); 1290 1291 #ifdef PNG_SEQUENTIAL_READ_SUPPORTED 1292 /* Read the information before the actual image data. */ 1293 extern PNG_EXPORT(void,png_read_info) PNGARG((png_structp png_ptr, 1294 png_infop info_ptr)); 1295 #endif 1296 1297 #ifdef PNG_TIME_RFC1123_SUPPORTED 1298 extern PNG_EXPORT(png_charp,png_convert_to_rfc1123) 1299 PNGARG((png_structp png_ptr, png_timep ptime)); 1300 #endif 1301 1302 #ifdef PNG_CONVERT_tIME_SUPPORTED 1303 /* Convert from a struct tm to png_time */ 1304 extern PNG_EXPORT(void,png_convert_from_struct_tm) PNGARG((png_timep ptime, 1305 struct tm FAR * ttime)); 1306 1307 /* Convert from time_t to png_time. Uses gmtime() */ 1308 extern PNG_EXPORT(void,png_convert_from_time_t) PNGARG((png_timep ptime, 1309 time_t ttime)); 1310 #endif /* PNG_CONVERT_tIME_SUPPORTED */ 1311 1312 #ifdef PNG_READ_EXPAND_SUPPORTED 1313 /* Expand data to 24-bit RGB, or 8-bit grayscale, with alpha if available. */ 1314 extern PNG_EXPORT(void,png_set_expand) PNGARG((png_structp png_ptr)); 1315 #ifndef PNG_1_0_X 1316 extern PNG_EXPORT(void,png_set_expand_gray_1_2_4_to_8) PNGARG((png_structp 1317 png_ptr)); 1318 #endif 1319 extern PNG_EXPORT(void,png_set_palette_to_rgb) PNGARG((png_structp png_ptr)); 1320 extern PNG_EXPORT(void,png_set_tRNS_to_alpha) PNGARG((png_structp png_ptr)); 1321 #if defined(PNG_1_0_X) || defined (PNG_1_2_X) 1322 /* Deprecated */ 1323 extern PNG_EXPORT(void,png_set_gray_1_2_4_to_8) PNGARG((png_structp 1324 png_ptr)) PNG_DEPRECATED; 1325 #endif 1326 #endif 1327 1328 #if defined(PNG_READ_BGR_SUPPORTED) || defined(PNG_WRITE_BGR_SUPPORTED) 1329 /* Use blue, green, red order for pixels. */ 1330 extern PNG_EXPORT(void,png_set_bgr) PNGARG((png_structp png_ptr)); 1331 #endif 1332 1333 #ifdef PNG_READ_GRAY_TO_RGB_SUPPORTED 1334 /* Expand the grayscale to 24-bit RGB if necessary. */ 1335 extern PNG_EXPORT(void,png_set_gray_to_rgb) PNGARG((png_structp png_ptr)); 1336 #endif 1337 1338 #ifdef PNG_READ_RGB_TO_GRAY_SUPPORTED 1339 /* Reduce RGB to grayscale. */ 1340 #ifdef PNG_FLOATING_POINT_SUPPORTED 1341 extern PNG_EXPORT(void,png_set_rgb_to_gray) PNGARG((png_structp png_ptr, 1342 int error_action, double red, double green )); 1343 #endif 1344 extern PNG_EXPORT(void,png_set_rgb_to_gray_fixed) PNGARG((png_structp png_ptr, 1345 int error_action, png_fixed_point red, png_fixed_point green )); 1346 extern PNG_EXPORT(png_byte,png_get_rgb_to_gray_status) PNGARG((png_structp 1347 png_ptr)); 1348 #endif 1349 1350 extern PNG_EXPORT(void,png_build_grayscale_palette) PNGARG((int bit_depth, 1351 png_colorp palette)); 1352 1353 #ifdef PNG_READ_STRIP_ALPHA_SUPPORTED 1354 extern PNG_EXPORT(void,png_set_strip_alpha) PNGARG((png_structp png_ptr)); 1355 #endif 1356 1357 #if defined(PNG_READ_SWAP_ALPHA_SUPPORTED) || \ 1358 defined(PNG_WRITE_SWAP_ALPHA_SUPPORTED) 1359 extern PNG_EXPORT(void,png_set_swap_alpha) PNGARG((png_structp png_ptr)); 1360 #endif 1361 1362 #if defined(PNG_READ_INVERT_ALPHA_SUPPORTED) || \ 1363 defined(PNG_WRITE_INVERT_ALPHA_SUPPORTED) 1364 extern PNG_EXPORT(void,png_set_invert_alpha) PNGARG((png_structp png_ptr)); 1365 #endif 1366 1367 #if defined(PNG_READ_FILLER_SUPPORTED) || defined(PNG_WRITE_FILLER_SUPPORTED) 1368 /* Add a filler byte to 8-bit Gray or 24-bit RGB images. */ 1369 extern PNG_EXPORT(void,png_set_filler) PNGARG((png_structp png_ptr, 1370 png_uint_32 filler, int flags)); 1371 /* The values of the PNG_FILLER_ defines should NOT be changed */ 1372 #define PNG_FILLER_BEFORE 0 1373 #define PNG_FILLER_AFTER 1 1374 /* Add an alpha byte to 8-bit Gray or 24-bit RGB images. */ 1375 #ifndef PNG_1_0_X 1376 extern PNG_EXPORT(void,png_set_add_alpha) PNGARG((png_structp png_ptr, 1377 png_uint_32 filler, int flags)); 1378 #endif 1379 #endif /* PNG_READ_FILLER_SUPPORTED || PNG_WRITE_FILLER_SUPPORTED */ 1380 1381 #if defined(PNG_READ_SWAP_SUPPORTED) || defined(PNG_WRITE_SWAP_SUPPORTED) 1382 /* Swap bytes in 16-bit depth files. */ 1383 extern PNG_EXPORT(void,png_set_swap) PNGARG((png_structp png_ptr)); 1384 #endif 1385 1386 #if defined(PNG_READ_PACK_SUPPORTED) || defined(PNG_WRITE_PACK_SUPPORTED) 1387 /* Use 1 byte per pixel in 1, 2, or 4-bit depth files. */ 1388 extern PNG_EXPORT(void,png_set_packing) PNGARG((png_structp png_ptr)); 1389 #endif 1390 1391 #if defined(PNG_READ_PACKSWAP_SUPPORTED) || defined(PNG_WRITE_PACKSWAP_SUPPORTED) 1392 /* Swap packing order of pixels in bytes. */ 1393 extern PNG_EXPORT(void,png_set_packswap) PNGARG((png_structp png_ptr)); 1394 #endif 1395 1396 #if defined(PNG_READ_SHIFT_SUPPORTED) || defined(PNG_WRITE_SHIFT_SUPPORTED) 1397 /* Converts files to legal bit depths. */ 1398 extern PNG_EXPORT(void,png_set_shift) PNGARG((png_structp png_ptr, 1399 png_color_8p true_bits)); 1400 #endif 1401 1402 #if defined(PNG_READ_INTERLACING_SUPPORTED) || \ 1403 defined(PNG_WRITE_INTERLACING_SUPPORTED) 1404 /* Have the code handle the interlacing. Returns the number of passes. */ 1405 extern PNG_EXPORT(int,png_set_interlace_handling) PNGARG((png_structp png_ptr)); 1406 #endif 1407 1408 #if defined(PNG_READ_INVERT_SUPPORTED) || defined(PNG_WRITE_INVERT_SUPPORTED) 1409 /* Invert monochrome files */ 1410 extern PNG_EXPORT(void,png_set_invert_mono) PNGARG((png_structp png_ptr)); 1411 #endif 1412 1413 #ifdef PNG_READ_BACKGROUND_SUPPORTED 1414 /* Handle alpha and tRNS by replacing with a background color. */ 1415 #ifdef PNG_FLOATING_POINT_SUPPORTED 1416 extern PNG_EXPORT(void,png_set_background) PNGARG((png_structp png_ptr, 1417 png_color_16p background_color, int background_gamma_code, 1418 int need_expand, double background_gamma)); 1419 #endif 1420 #define PNG_BACKGROUND_GAMMA_UNKNOWN 0 1421 #define PNG_BACKGROUND_GAMMA_SCREEN 1 1422 #define PNG_BACKGROUND_GAMMA_FILE 2 1423 #define PNG_BACKGROUND_GAMMA_UNIQUE 3 1424 #endif 1425 1426 #ifdef PNG_READ_16_TO_8_SUPPORTED 1427 /* Strip the second byte of information from a 16-bit depth file. */ 1428 extern PNG_EXPORT(void,png_set_strip_16) PNGARG((png_structp png_ptr)); 1429 #endif 1430 1431 #ifdef PNG_READ_DITHER_SUPPORTED 1432 /* Turn on dithering, and reduce the palette to the number of colors available. */ 1433 extern PNG_EXPORT(void,png_set_dither) PNGARG((png_structp png_ptr, 1434 png_colorp palette, int num_palette, int maximum_colors, 1435 png_uint_16p histogram, int full_dither)); 1436 #endif 1437 1438 #ifdef PNG_READ_GAMMA_SUPPORTED 1439 /* Handle gamma correction. Screen_gamma=(display_exponent) */ 1440 #ifdef PNG_FLOATING_POINT_SUPPORTED 1441 extern PNG_EXPORT(void,png_set_gamma) PNGARG((png_structp png_ptr, 1442 double screen_gamma, double default_file_gamma)); 1443 #endif 1444 #endif 1445 1446 #if defined(PNG_1_0_X) || defined (PNG_1_2_X) 1447 #if defined(PNG_READ_EMPTY_PLTE_SUPPORTED) || \ 1448 defined(PNG_WRITE_EMPTY_PLTE_SUPPORTED) 1449 /* Permit or disallow empty PLTE (0: not permitted, 1: permitted) */ 1450 /* Deprecated and will be removed. Use png_permit_mng_features() instead. */ 1451 extern PNG_EXPORT(void,png_permit_empty_plte) PNGARG((png_structp png_ptr, 1452 int empty_plte_permitted)) PNG_DEPRECATED; 1453 #endif 1454 #endif 1455 1456 #ifdef PNG_WRITE_FLUSH_SUPPORTED 1457 /* Set how many lines between output flushes - 0 for no flushing */ 1458 extern PNG_EXPORT(void,png_set_flush) PNGARG((png_structp png_ptr, int nrows)); 1459 /* Flush the current PNG output buffer */ 1460 extern PNG_EXPORT(void,png_write_flush) PNGARG((png_structp png_ptr)); 1461 #endif 1462 1463 /* Optional update palette with requested transformations */ 1464 extern PNG_EXPORT(void,png_start_read_image) PNGARG((png_structp png_ptr)); 1465 1466 /* Optional call to update the users info structure */ 1467 extern PNG_EXPORT(void,png_read_update_info) PNGARG((png_structp png_ptr, 1468 png_infop info_ptr)); 1469 1470 #ifndef PNG_NO_SEQUENTIAL_READ_SUPPORTED 1471 /* Read one or more rows of image data. */ 1472 extern PNG_EXPORT(void,png_read_rows) PNGARG((png_structp png_ptr, 1473 png_bytepp row, png_bytepp display_row, png_uint_32 num_rows)); 1474 #endif 1475 1476 #ifndef PNG_NO_SEQUENTIAL_READ_SUPPORTED 1477 /* Read a row of data. */ 1478 extern PNG_EXPORT(void,png_read_row) PNGARG((png_structp png_ptr, 1479 png_bytep row, 1480 png_bytep display_row)); 1481 #endif 1482 1483 #ifndef PNG_NO_SEQUENTIAL_READ_SUPPORTED 1484 /* Read the whole image into memory at once. */ 1485 extern PNG_EXPORT(void,png_read_image) PNGARG((png_structp png_ptr, 1486 png_bytepp image)); 1487 #endif 1488 1489 /* Write a row of image data */ 1490 extern PNG_EXPORT(void,png_write_row) PNGARG((png_structp png_ptr, 1491 png_bytep row)); 1492 1493 /* Write a few rows of image data */ 1494 extern PNG_EXPORT(void,png_write_rows) PNGARG((png_structp png_ptr, 1495 png_bytepp row, png_uint_32 num_rows)); 1496 1497 /* Write the image data */ 1498 extern PNG_EXPORT(void,png_write_image) PNGARG((png_structp png_ptr, 1499 png_bytepp image)); 1500 1501 /* Writes the end of the PNG file. */ 1502 extern PNG_EXPORT(void,png_write_end) PNGARG((png_structp png_ptr, 1503 png_infop info_ptr)); 1504 1505 #ifndef PNG_NO_SEQUENTIAL_READ_SUPPORTED 1506 /* Read the end of the PNG file. */ 1507 extern PNG_EXPORT(void,png_read_end) PNGARG((png_structp png_ptr, 1508 png_infop info_ptr)); 1509 #endif 1510 1511 /* Free any memory associated with the png_info_struct */ 1512 extern PNG_EXPORT(void,png_destroy_info_struct) PNGARG((png_structp png_ptr, 1513 png_infopp info_ptr_ptr)); 1514 1515 /* Free any memory associated with the png_struct and the png_info_structs */ 1516 extern PNG_EXPORT(void,png_destroy_read_struct) PNGARG((png_structpp 1517 png_ptr_ptr, png_infopp info_ptr_ptr, png_infopp end_info_ptr_ptr)); 1518 1519 /* Free all memory used by the read (old method - NOT DLL EXPORTED) */ 1520 extern void png_read_destroy PNGARG((png_structp png_ptr, png_infop info_ptr, 1521 png_infop end_info_ptr)) PNG_DEPRECATED; 1522 1523 /* Free any memory associated with the png_struct and the png_info_structs */ 1524 extern PNG_EXPORT(void,png_destroy_write_struct) 1525 PNGARG((png_structpp png_ptr_ptr, png_infopp info_ptr_ptr)); 1526 1527 /* Free any memory used in png_ptr struct (old method - NOT DLL EXPORTED) */ 1528 extern void png_write_destroy PNGARG((png_structp png_ptr)) PNG_DEPRECATED; 1529 1530 /* Set the libpng method of handling chunk CRC errors */ 1531 extern PNG_EXPORT(void,png_set_crc_action) PNGARG((png_structp png_ptr, 1532 int crit_action, int ancil_action)); 1533 1534 /* Values for png_set_crc_action() to say how to handle CRC errors in 1535 * ancillary and critical chunks, and whether to use the data contained 1536 * therein. Note that it is impossible to "discard" data in a critical 1537 * chunk. For versions prior to 0.90, the action was always error/quit, 1538 * whereas in version 0.90 and later, the action for CRC errors in ancillary 1539 * chunks is warn/discard. These values should NOT be changed. 1540 * 1541 * value action:critical action:ancillary 1542 */ 1543 #define PNG_CRC_DEFAULT 0 /* error/quit warn/discard data */ 1544 #define PNG_CRC_ERROR_QUIT 1 /* error/quit error/quit */ 1545 #define PNG_CRC_WARN_DISCARD 2 /* (INVALID) warn/discard data */ 1546 #define PNG_CRC_WARN_USE 3 /* warn/use data warn/use data */ 1547 #define PNG_CRC_QUIET_USE 4 /* quiet/use data quiet/use data */ 1548 #define PNG_CRC_NO_CHANGE 5 /* use current value use current value */ 1549 1550 /* These functions give the user control over the scan-line filtering in 1551 * libpng and the compression methods used by zlib. These functions are 1552 * mainly useful for testing, as the defaults should work with most users. 1553 * Those users who are tight on memory or want faster performance at the 1554 * expense of compression can modify them. See the compression library 1555 * header file (zlib.h) for an explination of the compression functions. 1556 */ 1557 1558 /* Set the filtering method(s) used by libpng. Currently, the only valid 1559 * value for "method" is 0. 1560 */ 1561 extern PNG_EXPORT(void,png_set_filter) PNGARG((png_structp png_ptr, int method, 1562 int filters)); 1563 1564 /* Flags for png_set_filter() to say which filters to use. The flags 1565 * are chosen so that they don't conflict with real filter types 1566 * below, in case they are supplied instead of the #defined constants. 1567 * These values should NOT be changed. 1568 */ 1569 #define PNG_NO_FILTERS 0x00 1570 #define PNG_FILTER_NONE 0x08 1571 #define PNG_FILTER_SUB 0x10 1572 #define PNG_FILTER_UP 0x20 1573 #define PNG_FILTER_AVG 0x40 1574 #define PNG_FILTER_PAETH 0x80 1575 #define PNG_ALL_FILTERS (PNG_FILTER_NONE | PNG_FILTER_SUB | PNG_FILTER_UP | \ 1576 PNG_FILTER_AVG | PNG_FILTER_PAETH) 1577 1578 /* Filter values (not flags) - used in pngwrite.c, pngwutil.c for now. 1579 * These defines should NOT be changed. 1580 */ 1581 #define PNG_FILTER_VALUE_NONE 0 1582 #define PNG_FILTER_VALUE_SUB 1 1583 #define PNG_FILTER_VALUE_UP 2 1584 #define PNG_FILTER_VALUE_AVG 3 1585 #define PNG_FILTER_VALUE_PAETH 4 1586 #define PNG_FILTER_VALUE_LAST 5 1587 1588 #if defined(PNG_WRITE_WEIGHTED_FILTER_SUPPORTED) /* EXPERIMENTAL */ 1589 /* The "heuristic_method" is given by one of the PNG_FILTER_HEURISTIC_ 1590 * defines, either the default (minimum-sum-of-absolute-differences), or 1591 * the experimental method (weighted-minimum-sum-of-absolute-differences). 1592 * 1593 * Weights are factors >= 1.0, indicating how important it is to keep the 1594 * filter type consistent between rows. Larger numbers mean the current 1595 * filter is that many times as likely to be the same as the "num_weights" 1596 * previous filters. This is cumulative for each previous row with a weight. 1597 * There needs to be "num_weights" values in "filter_weights", or it can be 1598 * NULL if the weights aren't being specified. Weights have no influence on 1599 * the selection of the first row filter. Well chosen weights can (in theory) 1600 * improve the compression for a given image. 1601 * 1602 * Costs are factors >= 1.0 indicating the relative decoding costs of a 1603 * filter type. Higher costs indicate more decoding expense, and are 1604 * therefore less likely to be selected over a filter with lower computational 1605 * costs. There needs to be a value in "filter_costs" for each valid filter 1606 * type (given by PNG_FILTER_VALUE_LAST), or it can be NULL if you aren't 1607 * setting the costs. Costs try to improve the speed of decompression without 1608 * unduly increasing the compressed image size. 1609 * 1610 * A negative weight or cost indicates the default value is to be used, and 1611 * values in the range [0.0, 1.0) indicate the value is to remain unchanged. 1612 * The default values for both weights and costs are currently 1.0, but may 1613 * change if good general weighting/cost heuristics can be found. If both 1614 * the weights and costs are set to 1.0, this degenerates the WEIGHTED method 1615 * to the UNWEIGHTED method, but with added encoding time/computation. 1616 */ 1617 #ifdef PNG_FLOATING_POINT_SUPPORTED 1618 extern PNG_EXPORT(void,png_set_filter_heuristics) PNGARG((png_structp png_ptr, 1619 int heuristic_method, int num_weights, png_doublep filter_weights, 1620 png_doublep filter_costs)); 1621 #endif 1622 #endif /* PNG_WRITE_WEIGHTED_FILTER_SUPPORTED */ 1623 1624 /* Heuristic used for row filter selection. These defines should NOT be 1625 * changed. 1626 */ 1627 #define PNG_FILTER_HEURISTIC_DEFAULT 0 /* Currently "UNWEIGHTED" */ 1628 #define PNG_FILTER_HEURISTIC_UNWEIGHTED 1 /* Used by libpng < 0.95 */ 1629 #define PNG_FILTER_HEURISTIC_WEIGHTED 2 /* Experimental feature */ 1630 #define PNG_FILTER_HEURISTIC_LAST 3 /* Not a valid value */ 1631 1632 /* Set the library compression level. Currently, valid values range from 1633 * 0 - 9, corresponding directly to the zlib compression levels 0 - 9 1634 * (0 - no compression, 9 - "maximal" compression). Note that tests have 1635 * shown that zlib compression levels 3-6 usually perform as well as level 9 1636 * for PNG images, and do considerably fewer caclulations. In the future, 1637 * these values may not correspond directly to the zlib compression levels. 1638 */ 1639 extern PNG_EXPORT(void,png_set_compression_level) PNGARG((png_structp png_ptr, 1640 int level)); 1641 1642 extern PNG_EXPORT(void,png_set_compression_mem_level) 1643 PNGARG((png_structp png_ptr, int mem_level)); 1644 1645 extern PNG_EXPORT(void,png_set_compression_strategy) 1646 PNGARG((png_structp png_ptr, int strategy)); 1647 1648 extern PNG_EXPORT(void,png_set_compression_window_bits) 1649 PNGARG((png_structp png_ptr, int window_bits)); 1650 1651 extern PNG_EXPORT(void,png_set_compression_method) PNGARG((png_structp png_ptr, 1652 int method)); 1653 1654 /* These next functions are called for input/output, memory, and error 1655 * handling. They are in the file pngrio.c, pngwio.c, and pngerror.c, 1656 * and call standard C I/O routines such as fread(), fwrite(), and 1657 * fprintf(). These functions can be made to use other I/O routines 1658 * at run time for those applications that need to handle I/O in a 1659 * different manner by calling png_set_???_fn(). See libpng.txt for 1660 * more information. 1661 */ 1662 1663 #ifdef PNG_STDIO_SUPPORTED 1664 /* Initialize the input/output for the PNG file to the default functions. */ 1665 extern PNG_EXPORT(void,png_init_io) PNGARG((png_structp png_ptr, png_FILE_p fp)); 1666 #endif 1667 1668 /* Replace the (error and abort), and warning functions with user 1669 * supplied functions. If no messages are to be printed you must still 1670 * write and use replacement functions. The replacement error_fn should 1671 * still do a longjmp to the last setjmp location if you are using this 1672 * method of error handling. If error_fn or warning_fn is NULL, the 1673 * default function will be used. 1674 */ 1675 1676 extern PNG_EXPORT(void,png_set_error_fn) PNGARG((png_structp png_ptr, 1677 png_voidp error_ptr, png_error_ptr error_fn, png_error_ptr warning_fn)); 1678 1679 /* Return the user pointer associated with the error functions */ 1680 extern PNG_EXPORT(png_voidp,png_get_error_ptr) PNGARG((png_structp png_ptr)); 1681 1682 /* Replace the default data output functions with a user supplied one(s). 1683 * If buffered output is not used, then output_flush_fn can be set to NULL. 1684 * If PNG_WRITE_FLUSH_SUPPORTED is not defined at libpng compile time 1685 * output_flush_fn will be ignored (and thus can be NULL). 1686 * It is probably a mistake to use NULL for output_flush_fn if 1687 * write_data_fn is not also NULL unless you have built libpng with 1688 * PNG_WRITE_FLUSH_SUPPORTED undefined, because in this case libpng's 1689 * default flush function, which uses the standard *FILE structure, will 1690 * be used. 1691 */ 1692 extern PNG_EXPORT(void,png_set_write_fn) PNGARG((png_structp png_ptr, 1693 png_voidp io_ptr, png_rw_ptr write_data_fn, png_flush_ptr output_flush_fn)); 1694 1695 /* Replace the default data input function with a user supplied one. */ 1696 extern PNG_EXPORT(void,png_set_read_fn) PNGARG((png_structp png_ptr, 1697 png_voidp io_ptr, png_rw_ptr read_data_fn)); 1698 1699 /* Return the user pointer associated with the I/O functions */ 1700 extern PNG_EXPORT(png_voidp,png_get_io_ptr) PNGARG((png_structp png_ptr)); 1701 1702 extern PNG_EXPORT(void,png_set_read_status_fn) PNGARG((png_structp png_ptr, 1703 png_read_status_ptr read_row_fn)); 1704 1705 extern PNG_EXPORT(void,png_set_write_status_fn) PNGARG((png_structp png_ptr, 1706 png_write_status_ptr write_row_fn)); 1707 1708 #ifdef PNG_USER_MEM_SUPPORTED 1709 /* Replace the default memory allocation functions with user supplied one(s). */ 1710 extern PNG_EXPORT(void,png_set_mem_fn) PNGARG((png_structp png_ptr, 1711 png_voidp mem_ptr, png_malloc_ptr malloc_fn, png_free_ptr free_fn)); 1712 /* Return the user pointer associated with the memory functions */ 1713 extern PNG_EXPORT(png_voidp,png_get_mem_ptr) PNGARG((png_structp png_ptr)); 1714 #endif 1715 1716 #if defined(PNG_READ_USER_TRANSFORM_SUPPORTED) || \ 1717 defined(PNG_LEGACY_SUPPORTED) 1718 extern PNG_EXPORT(void,png_set_read_user_transform_fn) PNGARG((png_structp 1719 png_ptr, png_user_transform_ptr read_user_transform_fn)); 1720 #endif 1721 1722 #if defined(PNG_WRITE_USER_TRANSFORM_SUPPORTED) || \ 1723 defined(PNG_LEGACY_SUPPORTED) 1724 extern PNG_EXPORT(void,png_set_write_user_transform_fn) PNGARG((png_structp 1725 png_ptr, png_user_transform_ptr write_user_transform_fn)); 1726 #endif 1727 1728 #if defined(PNG_READ_USER_TRANSFORM_SUPPORTED) || \ 1729 defined(PNG_WRITE_USER_TRANSFORM_SUPPORTED) || \ 1730 defined(PNG_LEGACY_SUPPORTED) 1731 extern PNG_EXPORT(void,png_set_user_transform_info) PNGARG((png_structp 1732 png_ptr, png_voidp user_transform_ptr, int user_transform_depth, 1733 int user_transform_channels)); 1734 /* Return the user pointer associated with the user transform functions */ 1735 extern PNG_EXPORT(png_voidp,png_get_user_transform_ptr) 1736 PNGARG((png_structp png_ptr)); 1737 #endif 1738 1739 #ifdef PNG_USER_CHUNKS_SUPPORTED 1740 extern PNG_EXPORT(void,png_set_read_user_chunk_fn) PNGARG((png_structp png_ptr, 1741 png_voidp user_chunk_ptr, png_user_chunk_ptr read_user_chunk_fn)); 1742 extern PNG_EXPORT(png_voidp,png_get_user_chunk_ptr) PNGARG((png_structp 1743 png_ptr)); 1744 #endif 1745 1746 #ifdef PNG_PROGRESSIVE_READ_SUPPORTED 1747 /* Sets the function callbacks for the push reader, and a pointer to a 1748 * user-defined structure available to the callback functions. 1749 */ 1750 extern PNG_EXPORT(void,png_set_progressive_read_fn) PNGARG((png_structp png_ptr, 1751 png_voidp progressive_ptr, 1752 png_progressive_info_ptr info_fn, png_progressive_row_ptr row_fn, 1753 png_progressive_end_ptr end_fn)); 1754 1755 /* Returns the user pointer associated with the push read functions */ 1756 extern PNG_EXPORT(png_voidp,png_get_progressive_ptr) 1757 PNGARG((png_structp png_ptr)); 1758 1759 /* Function to be called when data becomes available */ 1760 extern PNG_EXPORT(void,png_process_data) PNGARG((png_structp png_ptr, 1761 png_infop info_ptr, png_bytep buffer, png_size_t buffer_size)); 1762 1763 /* Function that combines rows. Not very much different than the 1764 * png_combine_row() call. Is this even used????? 1765 */ 1766 extern PNG_EXPORT(void,png_progressive_combine_row) PNGARG((png_structp png_ptr, 1767 png_bytep old_row, png_bytep new_row)); 1768 #endif /* PNG_PROGRESSIVE_READ_SUPPORTED */ 1769 1770 extern PNG_EXPORT(png_voidp,png_malloc) PNGARG((png_structp png_ptr, 1771 png_uint_32 size)) PNG_ALLOCATED; 1772 1773 #ifdef PNG_1_0_X 1774 # define png_malloc_warn png_malloc 1775 #else 1776 /* Added at libpng version 1.2.4 */ 1777 extern PNG_EXPORT(png_voidp,png_malloc_warn) PNGARG((png_structp png_ptr, 1778 png_uint_32 size)) PNG_ALLOCATED; 1779 #endif 1780 1781 /* Frees a pointer allocated by png_malloc() */ 1782 extern PNG_EXPORT(void,png_free) PNGARG((png_structp png_ptr, png_voidp ptr)); 1783 1784 #ifdef PNG_1_0_X 1785 /* Function to allocate memory for zlib. */ 1786 extern PNG_EXPORT(voidpf,png_zalloc) PNGARG((voidpf png_ptr, uInt items, 1787 uInt size)); 1788 1789 /* Function to free memory for zlib */ 1790 extern PNG_EXPORT(void,png_zfree) PNGARG((voidpf png_ptr, voidpf ptr)); 1791 #endif 1792 1793 /* Free data that was allocated internally */ 1794 extern PNG_EXPORT(void,png_free_data) PNGARG((png_structp png_ptr, 1795 png_infop info_ptr, png_uint_32 free_me, int num)); 1796 #ifdef PNG_FREE_ME_SUPPORTED 1797 /* Reassign responsibility for freeing existing data, whether allocated 1798 * by libpng or by the application 1799 */ 1800 extern PNG_EXPORT(void,png_data_freer) PNGARG((png_structp png_ptr, 1801 png_infop info_ptr, int freer, png_uint_32 mask)); 1802 #endif 1803 /* Assignments for png_data_freer */ 1804 #define PNG_DESTROY_WILL_FREE_DATA 1 1805 #define PNG_SET_WILL_FREE_DATA 1 1806 #define PNG_USER_WILL_FREE_DATA 2 1807 /* Flags for png_ptr->free_me and info_ptr->free_me */ 1808 #define PNG_FREE_HIST 0x0008 1809 #define PNG_FREE_ICCP 0x0010 1810 #define PNG_FREE_SPLT 0x0020 1811 #define PNG_FREE_ROWS 0x0040 1812 #define PNG_FREE_PCAL 0x0080 1813 #define PNG_FREE_SCAL 0x0100 1814 #define PNG_FREE_UNKN 0x0200 1815 #define PNG_FREE_LIST 0x0400 1816 #define PNG_FREE_PLTE 0x1000 1817 #define PNG_FREE_TRNS 0x2000 1818 #define PNG_FREE_TEXT 0x4000 1819 #define PNG_FREE_ALL 0x7fff 1820 #define PNG_FREE_MUL 0x4220 /* PNG_FREE_SPLT|PNG_FREE_TEXT|PNG_FREE_UNKN */ 1821 1822 #ifdef PNG_USER_MEM_SUPPORTED 1823 extern PNG_EXPORT(png_voidp,png_malloc_default) PNGARG((png_structp png_ptr, 1824 png_uint_32 size)) PNG_ALLOCATED; 1825 extern PNG_EXPORT(void,png_free_default) PNGARG((png_structp png_ptr, 1826 png_voidp ptr)); 1827 #endif 1828 1829 extern PNG_EXPORT(png_voidp,png_memcpy_check) PNGARG((png_structp png_ptr, 1830 png_voidp s1, png_voidp s2, png_uint_32 size)) PNG_DEPRECATED; 1831 1832 extern PNG_EXPORT(png_voidp,png_memset_check) PNGARG((png_structp png_ptr, 1833 png_voidp s1, int value, png_uint_32 size)) PNG_DEPRECATED; 1834 1835 #if defined(USE_FAR_KEYWORD) /* memory model conversion function */ 1836 extern void *png_far_to_near PNGARG((png_structp png_ptr,png_voidp ptr, 1837 int check)); 1838 #endif /* USE_FAR_KEYWORD */ 1839 1840 #ifndef PNG_NO_ERROR_TEXT 1841 /* Fatal error in PNG image of libpng - can't continue */ 1842 extern PNG_EXPORT(void,png_error) PNGARG((png_structp png_ptr, 1843 png_const_charp error_message)) PNG_NORETURN; 1844 1845 /* The same, but the chunk name is prepended to the error string. */ 1846 extern PNG_EXPORT(void,png_chunk_error) PNGARG((png_structp png_ptr, 1847 png_const_charp error_message)) PNG_NORETURN; 1848 #else 1849 /* Fatal error in PNG image of libpng - can't continue */ 1850 extern PNG_EXPORT(void,png_err) PNGARG((png_structp png_ptr)) PNG_NORETURN; 1851 #endif 1852 1853 #ifndef PNG_NO_WARNINGS 1854 /* Non-fatal error in libpng. Can continue, but may have a problem. */ 1855 extern PNG_EXPORT(void,png_warning) PNGARG((png_structp png_ptr, 1856 png_const_charp warning_message)); 1857 1858 #ifdef PNG_READ_SUPPORTED 1859 /* Non-fatal error in libpng, chunk name is prepended to message. */ 1860 extern PNG_EXPORT(void,png_chunk_warning) PNGARG((png_structp png_ptr, 1861 png_const_charp warning_message)); 1862 #endif /* PNG_READ_SUPPORTED */ 1863 #endif /* PNG_NO_WARNINGS */ 1864 1865 /* The png_set_<chunk> functions are for storing values in the png_info_struct. 1866 * Similarly, the png_get_<chunk> calls are used to read values from the 1867 * png_info_struct, either storing the parameters in the passed variables, or 1868 * setting pointers into the png_info_struct where the data is stored. The 1869 * png_get_<chunk> functions return a non-zero value if the data was available 1870 * in info_ptr, or return zero and do not change any of the parameters if the 1871 * data was not available. 1872 * 1873 * These functions should be used instead of directly accessing png_info 1874 * to avoid problems with future changes in the size and internal layout of 1875 * png_info_struct. 1876 */ 1877 /* Returns "flag" if chunk data is valid in info_ptr. */ 1878 extern PNG_EXPORT(png_uint_32,png_get_valid) PNGARG((png_structp png_ptr, 1879 png_infop info_ptr, png_uint_32 flag)); 1880 1881 /* Returns number of bytes needed to hold a transformed row. */ 1882 extern PNG_EXPORT(png_uint_32,png_get_rowbytes) PNGARG((png_structp png_ptr, 1883 png_infop info_ptr)); 1884 1885 #ifdef PNG_INFO_IMAGE_SUPPORTED 1886 /* Returns row_pointers, which is an array of pointers to scanlines that was 1887 * returned from png_read_png(). 1888 */ 1889 extern PNG_EXPORT(png_bytepp,png_get_rows) PNGARG((png_structp png_ptr, 1890 png_infop info_ptr)); 1891 /* Set row_pointers, which is an array of pointers to scanlines for use 1892 * by png_write_png(). 1893 */ 1894 extern PNG_EXPORT(void,png_set_rows) PNGARG((png_structp png_ptr, 1895 png_infop info_ptr, png_bytepp row_pointers)); 1896 #endif 1897 1898 /* Returns number of color channels in image. */ 1899 extern PNG_EXPORT(png_byte,png_get_channels) PNGARG((png_structp png_ptr, 1900 png_infop info_ptr)); 1901 1902 #ifdef PNG_EASY_ACCESS_SUPPORTED 1903 /* Returns image width in pixels. */ 1904 extern PNG_EXPORT(png_uint_32, png_get_image_width) PNGARG((png_structp 1905 png_ptr, png_infop info_ptr)); 1906 1907 /* Returns image height in pixels. */ 1908 extern PNG_EXPORT(png_uint_32, png_get_image_height) PNGARG((png_structp 1909 png_ptr, png_infop info_ptr)); 1910 1911 /* Returns image bit_depth. */ 1912 extern PNG_EXPORT(png_byte, png_get_bit_depth) PNGARG((png_structp 1913 png_ptr, png_infop info_ptr)); 1914 1915 /* Returns image color_type. */ 1916 extern PNG_EXPORT(png_byte, png_get_color_type) PNGARG((png_structp 1917 png_ptr, png_infop info_ptr)); 1918 1919 /* Returns image filter_type. */ 1920 extern PNG_EXPORT(png_byte, png_get_filter_type) PNGARG((png_structp 1921 png_ptr, png_infop info_ptr)); 1922 1923 /* Returns image interlace_type. */ 1924 extern PNG_EXPORT(png_byte, png_get_interlace_type) PNGARG((png_structp 1925 png_ptr, png_infop info_ptr)); 1926 1927 /* Returns image compression_type. */ 1928 extern PNG_EXPORT(png_byte, png_get_compression_type) PNGARG((png_structp 1929 png_ptr, png_infop info_ptr)); 1930 1931 /* Returns image resolution in pixels per meter, from pHYs chunk data. */ 1932 extern PNG_EXPORT(png_uint_32, png_get_pixels_per_meter) PNGARG((png_structp 1933 png_ptr, png_infop info_ptr)); 1934 extern PNG_EXPORT(png_uint_32, png_get_x_pixels_per_meter) PNGARG((png_structp 1935 png_ptr, png_infop info_ptr)); 1936 extern PNG_EXPORT(png_uint_32, png_get_y_pixels_per_meter) PNGARG((png_structp 1937 png_ptr, png_infop info_ptr)); 1938 1939 /* Returns pixel aspect ratio, computed from pHYs chunk data. */ 1940 #ifdef PNG_FLOATING_POINT_SUPPORTED 1941 extern PNG_EXPORT(float, png_get_pixel_aspect_ratio) PNGARG((png_structp 1942 png_ptr, png_infop info_ptr)); 1943 #endif 1944 1945 /* Returns image x, y offset in pixels or microns, from oFFs chunk data. */ 1946 extern PNG_EXPORT(png_int_32, png_get_x_offset_pixels) PNGARG((png_structp 1947 png_ptr, png_infop info_ptr)); 1948 extern PNG_EXPORT(png_int_32, png_get_y_offset_pixels) PNGARG((png_structp 1949 png_ptr, png_infop info_ptr)); 1950 extern PNG_EXPORT(png_int_32, png_get_x_offset_microns) PNGARG((png_structp 1951 png_ptr, png_infop info_ptr)); 1952 extern PNG_EXPORT(png_int_32, png_get_y_offset_microns) PNGARG((png_structp 1953 png_ptr, png_infop info_ptr)); 1954 1955 #endif /* PNG_EASY_ACCESS_SUPPORTED */ 1956 1957 /* Returns pointer to signature string read from PNG header */ 1958 extern PNG_EXPORT(png_bytep,png_get_signature) PNGARG((png_structp png_ptr, 1959 png_infop info_ptr)); 1960 1961 #ifdef PNG_bKGD_SUPPORTED 1962 extern PNG_EXPORT(png_uint_32,png_get_bKGD) PNGARG((png_structp png_ptr, 1963 png_infop info_ptr, png_color_16p *background)); 1964 #endif 1965 1966 #ifdef PNG_bKGD_SUPPORTED 1967 extern PNG_EXPORT(void,png_set_bKGD) PNGARG((png_structp png_ptr, 1968 png_infop info_ptr, png_color_16p background)); 1969 #endif 1970 1971 #ifdef PNG_cHRM_SUPPORTED 1972 #ifdef PNG_FLOATING_POINT_SUPPORTED 1973 extern PNG_EXPORT(png_uint_32,png_get_cHRM) PNGARG((png_structp png_ptr, 1974 png_infop info_ptr, double *white_x, double *white_y, double *red_x, 1975 double *red_y, double *green_x, double *green_y, double *blue_x, 1976 double *blue_y)); 1977 #endif 1978 #ifdef PNG_FIXED_POINT_SUPPORTED 1979 extern PNG_EXPORT(png_uint_32,png_get_cHRM_fixed) PNGARG((png_structp png_ptr, 1980 png_infop info_ptr, png_fixed_point *int_white_x, png_fixed_point 1981 *int_white_y, png_fixed_point *int_red_x, png_fixed_point *int_red_y, 1982 png_fixed_point *int_green_x, png_fixed_point *int_green_y, png_fixed_point 1983 *int_blue_x, png_fixed_point *int_blue_y)); 1984 #endif 1985 #endif 1986 1987 #ifdef PNG_cHRM_SUPPORTED 1988 #ifdef PNG_FLOATING_POINT_SUPPORTED 1989 extern PNG_EXPORT(void,png_set_cHRM) PNGARG((png_structp png_ptr, 1990 png_infop info_ptr, double white_x, double white_y, double red_x, 1991 double red_y, double green_x, double green_y, double blue_x, double blue_y)); 1992 #endif 1993 #ifdef PNG_FIXED_POINT_SUPPORTED 1994 extern PNG_EXPORT(void,png_set_cHRM_fixed) PNGARG((png_structp png_ptr, 1995 png_infop info_ptr, png_fixed_point int_white_x, png_fixed_point int_white_y, 1996 png_fixed_point int_red_x, png_fixed_point int_red_y, png_fixed_point 1997 int_green_x, png_fixed_point int_green_y, png_fixed_point int_blue_x, 1998 png_fixed_point int_blue_y)); 1999 #endif 2000 #endif 2001 2002 #ifdef PNG_gAMA_SUPPORTED 2003 #ifdef PNG_FLOATING_POINT_SUPPORTED 2004 extern PNG_EXPORT(png_uint_32,png_get_gAMA) PNGARG((png_structp png_ptr, 2005 png_infop info_ptr, double *file_gamma)); 2006 #endif 2007 extern PNG_EXPORT(png_uint_32,png_get_gAMA_fixed) PNGARG((png_structp png_ptr, 2008 png_infop info_ptr, png_fixed_point *int_file_gamma)); 2009 #endif 2010 2011 #ifdef PNG_gAMA_SUPPORTED 2012 #ifdef PNG_FLOATING_POINT_SUPPORTED 2013 extern PNG_EXPORT(void,png_set_gAMA) PNGARG((png_structp png_ptr, 2014 png_infop info_ptr, double file_gamma)); 2015 #endif 2016 extern PNG_EXPORT(void,png_set_gAMA_fixed) PNGARG((png_structp png_ptr, 2017 png_infop info_ptr, png_fixed_point int_file_gamma)); 2018 #endif 2019 2020 #ifdef PNG_hIST_SUPPORTED 2021 extern PNG_EXPORT(png_uint_32,png_get_hIST) PNGARG((png_structp png_ptr, 2022 png_infop info_ptr, png_uint_16p *hist)); 2023 #endif 2024 2025 #ifdef PNG_hIST_SUPPORTED 2026 extern PNG_EXPORT(void,png_set_hIST) PNGARG((png_structp png_ptr, 2027 png_infop info_ptr, png_uint_16p hist)); 2028 #endif 2029 2030 extern PNG_EXPORT(png_uint_32,png_get_IHDR) PNGARG((png_structp png_ptr, 2031 png_infop info_ptr, png_uint_32 *width, png_uint_32 *height, 2032 int *bit_depth, int *color_type, int *interlace_method, 2033 int *compression_method, int *filter_method)); 2034 2035 extern PNG_EXPORT(void,png_set_IHDR) PNGARG((png_structp png_ptr, 2036 png_infop info_ptr, png_uint_32 width, png_uint_32 height, int bit_depth, 2037 int color_type, int interlace_method, int compression_method, 2038 int filter_method)); 2039 2040 #ifdef PNG_oFFs_SUPPORTED 2041 extern PNG_EXPORT(png_uint_32,png_get_oFFs) PNGARG((png_structp png_ptr, 2042 png_infop info_ptr, png_int_32 *offset_x, png_int_32 *offset_y, 2043 int *unit_type)); 2044 #endif 2045 2046 #ifdef PNG_oFFs_SUPPORTED 2047 extern PNG_EXPORT(void,png_set_oFFs) PNGARG((png_structp png_ptr, 2048 png_infop info_ptr, png_int_32 offset_x, png_int_32 offset_y, 2049 int unit_type)); 2050 #endif 2051 2052 #ifdef PNG_pCAL_SUPPORTED 2053 extern PNG_EXPORT(png_uint_32,png_get_pCAL) PNGARG((png_structp png_ptr, 2054 png_infop info_ptr, png_charp *purpose, png_int_32 *X0, png_int_32 *X1, 2055 int *type, int *nparams, png_charp *units, png_charpp *params)); 2056 #endif 2057 2058 #ifdef PNG_pCAL_SUPPORTED 2059 extern PNG_EXPORT(void,png_set_pCAL) PNGARG((png_structp png_ptr, 2060 png_infop info_ptr, png_charp purpose, png_int_32 X0, png_int_32 X1, 2061 int type, int nparams, png_charp units, png_charpp params)); 2062 #endif 2063 2064 #ifdef PNG_pHYs_SUPPORTED 2065 extern PNG_EXPORT(png_uint_32,png_get_pHYs) PNGARG((png_structp png_ptr, 2066 png_infop info_ptr, png_uint_32 *res_x, png_uint_32 *res_y, int *unit_type)); 2067 #endif 2068 2069 #ifdef PNG_pHYs_SUPPORTED 2070 extern PNG_EXPORT(void,png_set_pHYs) PNGARG((png_structp png_ptr, 2071 png_infop info_ptr, png_uint_32 res_x, png_uint_32 res_y, int unit_type)); 2072 #endif 2073 2074 extern PNG_EXPORT(png_uint_32,png_get_PLTE) PNGARG((png_structp png_ptr, 2075 png_infop info_ptr, png_colorp *palette, int *num_palette)); 2076 2077 extern PNG_EXPORT(void,png_set_PLTE) PNGARG((png_structp png_ptr, 2078 png_infop info_ptr, png_colorp palette, int num_palette)); 2079 2080 #ifdef PNG_sBIT_SUPPORTED 2081 extern PNG_EXPORT(png_uint_32,png_get_sBIT) PNGARG((png_structp png_ptr, 2082 png_infop info_ptr, png_color_8p *sig_bit)); 2083 #endif 2084 2085 #ifdef PNG_sBIT_SUPPORTED 2086 extern PNG_EXPORT(void,png_set_sBIT) PNGARG((png_structp png_ptr, 2087 png_infop info_ptr, png_color_8p sig_bit)); 2088 #endif 2089 2090 #ifdef PNG_sRGB_SUPPORTED 2091 extern PNG_EXPORT(png_uint_32,png_get_sRGB) PNGARG((png_structp png_ptr, 2092 png_infop info_ptr, int *intent)); 2093 #endif 2094 2095 #ifdef PNG_sRGB_SUPPORTED 2096 extern PNG_EXPORT(void,png_set_sRGB) PNGARG((png_structp png_ptr, 2097 png_infop info_ptr, int intent)); 2098 extern PNG_EXPORT(void,png_set_sRGB_gAMA_and_cHRM) PNGARG((png_structp png_ptr, 2099 png_infop info_ptr, int intent)); 2100 #endif 2101 2102 #ifdef PNG_iCCP_SUPPORTED 2103 extern PNG_EXPORT(png_uint_32,png_get_iCCP) PNGARG((png_structp png_ptr, 2104 png_infop info_ptr, png_charpp name, int *compression_type, 2105 png_charpp profile, png_uint_32 *proflen)); 2106 /* Note to maintainer: profile should be png_bytepp */ 2107 #endif 2108 2109 #ifdef PNG_iCCP_SUPPORTED 2110 extern PNG_EXPORT(void,png_set_iCCP) PNGARG((png_structp png_ptr, 2111 png_infop info_ptr, png_charp name, int compression_type, 2112 png_charp profile, png_uint_32 proflen)); 2113 /* Note to maintainer: profile should be png_bytep */ 2114 #endif 2115 2116 #ifdef PNG_sPLT_SUPPORTED 2117 extern PNG_EXPORT(png_uint_32,png_get_sPLT) PNGARG((png_structp png_ptr, 2118 png_infop info_ptr, png_sPLT_tpp entries)); 2119 #endif 2120 2121 #ifdef PNG_sPLT_SUPPORTED 2122 extern PNG_EXPORT(void,png_set_sPLT) PNGARG((png_structp png_ptr, 2123 png_infop info_ptr, png_sPLT_tp entries, int nentries)); 2124 #endif 2125 2126 #ifdef PNG_TEXT_SUPPORTED 2127 /* png_get_text also returns the number of text chunks in *num_text */ 2128 extern PNG_EXPORT(png_uint_32,png_get_text) PNGARG((png_structp png_ptr, 2129 png_infop info_ptr, png_textp *text_ptr, int *num_text)); 2130 #endif 2131 2132 /* 2133 * Note while png_set_text() will accept a structure whose text, 2134 * language, and translated keywords are NULL pointers, the structure 2135 * returned by png_get_text will always contain regular 2136 * zero-terminated C strings. They might be empty strings but 2137 * they will never be NULL pointers. 2138 */ 2139 2140 #ifdef PNG_TEXT_SUPPORTED 2141 extern PNG_EXPORT(void,png_set_text) PNGARG((png_structp png_ptr, 2142 png_infop info_ptr, png_textp text_ptr, int num_text)); 2143 #endif 2144 2145 #ifdef PNG_tIME_SUPPORTED 2146 extern PNG_EXPORT(png_uint_32,png_get_tIME) PNGARG((png_structp png_ptr, 2147 png_infop info_ptr, png_timep *mod_time)); 2148 #endif 2149 2150 #ifdef PNG_tIME_SUPPORTED 2151 extern PNG_EXPORT(void,png_set_tIME) PNGARG((png_structp png_ptr, 2152 png_infop info_ptr, png_timep mod_time)); 2153 #endif 2154 2155 #ifdef PNG_tRNS_SUPPORTED 2156 extern PNG_EXPORT(png_uint_32,png_get_tRNS) PNGARG((png_structp png_ptr, 2157 png_infop info_ptr, png_bytep *trans, int *num_trans, 2158 png_color_16p *trans_values)); 2159 #endif 2160 2161 #ifdef PNG_tRNS_SUPPORTED 2162 extern PNG_EXPORT(void,png_set_tRNS) PNGARG((png_structp png_ptr, 2163 png_infop info_ptr, png_bytep trans, int num_trans, 2164 png_color_16p trans_values)); 2165 #endif 2166 2167 #ifdef PNG_tRNS_SUPPORTED 2168 #endif 2169 2170 #ifdef PNG_sCAL_SUPPORTED 2171 #ifdef PNG_FLOATING_POINT_SUPPORTED 2172 extern PNG_EXPORT(png_uint_32,png_get_sCAL) PNGARG((png_structp png_ptr, 2173 png_infop info_ptr, int *unit, double *width, double *height)); 2174 #else 2175 #ifdef PNG_FIXED_POINT_SUPPORTED 2176 extern PNG_EXPORT(png_uint_32,png_get_sCAL_s) PNGARG((png_structp png_ptr, 2177 png_infop info_ptr, int *unit, png_charpp swidth, png_charpp sheight)); 2178 #endif 2179 #endif 2180 #endif /* PNG_sCAL_SUPPORTED */ 2181 2182 #ifdef PNG_sCAL_SUPPORTED 2183 #ifdef PNG_FLOATING_POINT_SUPPORTED 2184 extern PNG_EXPORT(void,png_set_sCAL) PNGARG((png_structp png_ptr, 2185 png_infop info_ptr, int unit, double width, double height)); 2186 #else 2187 #ifdef PNG_FIXED_POINT_SUPPORTED 2188 extern PNG_EXPORT(void,png_set_sCAL_s) PNGARG((png_structp png_ptr, 2189 png_infop info_ptr, int unit, png_charp swidth, png_charp sheight)); 2190 #endif 2191 #endif 2192 #endif /* PNG_sCAL_SUPPORTED || PNG_WRITE_sCAL_SUPPORTED */ 2193 2194 #ifdef PNG_HANDLE_AS_UNKNOWN_SUPPORTED 2195 /* Provide a list of chunks and how they are to be handled, if the built-in 2196 handling or default unknown chunk handling is not desired. Any chunks not 2197 listed will be handled in the default manner. The IHDR and IEND chunks 2198 must not be listed. 2199 keep = 0: follow default behaviour 2200 = 1: do not keep 2201 = 2: keep only if safe-to-copy 2202 = 3: keep even if unsafe-to-copy 2203 */ 2204 extern PNG_EXPORT(void, png_set_keep_unknown_chunks) PNGARG((png_structp 2205 png_ptr, int keep, png_bytep chunk_list, int num_chunks)); 2206 PNG_EXPORT(int,png_handle_as_unknown) PNGARG((png_structp png_ptr, png_bytep 2207 chunk_name)); 2208 #endif 2209 #ifdef PNG_UNKNOWN_CHUNKS_SUPPORTED 2210 extern PNG_EXPORT(void, png_set_unknown_chunks) PNGARG((png_structp png_ptr, 2211 png_infop info_ptr, png_unknown_chunkp unknowns, int num_unknowns)); 2212 extern PNG_EXPORT(void, png_set_unknown_chunk_location) 2213 PNGARG((png_structp png_ptr, png_infop info_ptr, int chunk, int location)); 2214 extern PNG_EXPORT(png_uint_32,png_get_unknown_chunks) PNGARG((png_structp 2215 png_ptr, png_infop info_ptr, png_unknown_chunkpp entries)); 2216 #endif 2217 2218 /* Png_free_data() will turn off the "valid" flag for anything it frees. 2219 * If you need to turn it off for a chunk that your application has freed, 2220 * you can use png_set_invalid(png_ptr, info_ptr, PNG_INFO_CHNK); 2221 */ 2222 extern PNG_EXPORT(void, png_set_invalid) PNGARG((png_structp png_ptr, 2223 png_infop info_ptr, int mask)); 2224 2225 #ifdef PNG_INFO_IMAGE_SUPPORTED 2226 /* The "params" pointer is currently not used and is for future expansion. */ 2227 extern PNG_EXPORT(void, png_read_png) PNGARG((png_structp png_ptr, 2228 png_infop info_ptr, 2229 int transforms, 2230 png_voidp params)); 2231 extern PNG_EXPORT(void, png_write_png) PNGARG((png_structp png_ptr, 2232 png_infop info_ptr, 2233 int transforms, 2234 png_voidp params)); 2235 #endif 2236 2237 /* Define PNG_DEBUG at compile time for debugging information. Higher 2238 * numbers for PNG_DEBUG mean more debugging information. This has 2239 * only been added since version 0.95 so it is not implemented throughout 2240 * libpng yet, but more support will be added as needed. 2241 */ 2242 #ifdef PNG_DEBUG 2243 #if (PNG_DEBUG > 0) 2244 #if !defined(PNG_DEBUG_FILE) && defined(_MSC_VER) 2245 #include <crtdbg.h> 2246 #if (PNG_DEBUG > 1) 2247 #ifndef _DEBUG 2248 # define _DEBUG 2249 #endif 2250 #ifndef png_debug 2251 #define png_debug(l,m) _RPT0(_CRT_WARN,m PNG_STRING_NEWLINE) 2252 #endif 2253 #ifndef png_debug1 2254 #define png_debug1(l,m,p1) _RPT1(_CRT_WARN,m PNG_STRING_NEWLINE,p1) 2255 #endif 2256 #ifndef png_debug2 2257 #define png_debug2(l,m,p1,p2) _RPT2(_CRT_WARN,m PNG_STRING_NEWLINE,p1,p2) 2258 #endif 2259 #endif 2260 #else /* PNG_DEBUG_FILE || !_MSC_VER */ 2261 #ifndef PNG_DEBUG_FILE 2262 #define PNG_DEBUG_FILE stderr 2263 #endif /* PNG_DEBUG_FILE */ 2264 2265 #if (PNG_DEBUG > 1) 2266 /* Note: ["%s"m PNG_STRING_NEWLINE] probably does not work on non-ISO 2267 * compilers. 2268 */ 2269 # ifdef __STDC__ 2270 # ifndef png_debug 2271 # define png_debug(l,m) \ 2272 { \ 2273 int num_tabs=l; \ 2274 fprintf(PNG_DEBUG_FILE,"%s"m PNG_STRING_NEWLINE,(num_tabs==1 ? "\t" : \ 2275 (num_tabs==2 ? "\t\t":(num_tabs>2 ? "\t\t\t":"")))); \ 2276 } 2277 # endif 2278 # ifndef png_debug1 2279 # define png_debug1(l,m,p1) \ 2280 { \ 2281 int num_tabs=l; \ 2282 fprintf(PNG_DEBUG_FILE,"%s"m PNG_STRING_NEWLINE,(num_tabs==1 ? "\t" : \ 2283 (num_tabs==2 ? "\t\t":(num_tabs>2 ? "\t\t\t":""))),p1); \ 2284 } 2285 # endif 2286 # ifndef png_debug2 2287 # define png_debug2(l,m,p1,p2) \ 2288 { \ 2289 int num_tabs=l; \ 2290 fprintf(PNG_DEBUG_FILE,"%s"m PNG_STRING_NEWLINE,(num_tabs==1 ? "\t" : \ 2291 (num_tabs==2 ? "\t\t":(num_tabs>2 ? "\t\t\t":""))),p1,p2); \ 2292 } 2293 # endif 2294 # else /* __STDC __ */ 2295 # ifndef png_debug 2296 # define png_debug(l,m) \ 2297 { \ 2298 int num_tabs=l; \ 2299 char format[256]; \ 2300 snprintf(format,256,"%s%s%s",(num_tabs==1 ? "\t" : \ 2301 (num_tabs==2 ? "\t\t":(num_tabs>2 ? "\t\t\t":""))), \ 2302 m,PNG_STRING_NEWLINE); \ 2303 fprintf(PNG_DEBUG_FILE,format); \ 2304 } 2305 # endif 2306 # ifndef png_debug1 2307 # define png_debug1(l,m,p1) \ 2308 { \ 2309 int num_tabs=l; \ 2310 char format[256]; \ 2311 snprintf(format,256,"%s%s%s",(num_tabs==1 ? "\t" : \ 2312 (num_tabs==2 ? "\t\t":(num_tabs>2 ? "\t\t\t":""))), \ 2313 m,PNG_STRING_NEWLINE); \ 2314 fprintf(PNG_DEBUG_FILE,format,p1); \ 2315 } 2316 # endif 2317 # ifndef png_debug2 2318 # define png_debug2(l,m,p1,p2) \ 2319 { \ 2320 int num_tabs=l; \ 2321 char format[256]; \ 2322 snprintf(format,256,"%s%s%s",(num_tabs==1 ? "\t" : \ 2323 (num_tabs==2 ? "\t\t":(num_tabs>2 ? "\t\t\t":""))), \ 2324 m,PNG_STRING_NEWLINE); \ 2325 fprintf(PNG_DEBUG_FILE,format,p1,p2); \ 2326 } 2327 # endif 2328 # endif /* __STDC __ */ 2329 #endif /* (PNG_DEBUG > 1) */ 2330 2331 #endif /* _MSC_VER */ 2332 #endif /* (PNG_DEBUG > 0) */ 2333 #endif /* PNG_DEBUG */ 2334 #ifndef png_debug 2335 #define png_debug(l, m) 2336 #endif 2337 #ifndef png_debug1 2338 #define png_debug1(l, m, p1) 2339 #endif 2340 #ifndef png_debug2 2341 #define png_debug2(l, m, p1, p2) 2342 #endif 2343 2344 extern PNG_EXPORT(png_charp,png_get_copyright) PNGARG((png_structp png_ptr)); 2345 extern PNG_EXPORT(png_charp,png_get_header_ver) PNGARG((png_structp png_ptr)); 2346 extern PNG_EXPORT(png_charp,png_get_header_version) PNGARG((png_structp png_ptr)); 2347 extern PNG_EXPORT(png_charp,png_get_libpng_ver) PNGARG((png_structp png_ptr)); 2348 2349 #ifdef PNG_MNG_FEATURES_SUPPORTED 2350 extern PNG_EXPORT(png_uint_32,png_permit_mng_features) PNGARG((png_structp 2351 png_ptr, png_uint_32 mng_features_permitted)); 2352 #endif 2353 2354 /* For use in png_set_keep_unknown, added to version 1.2.6 */ 2355 #define PNG_HANDLE_CHUNK_AS_DEFAULT 0 2356 #define PNG_HANDLE_CHUNK_NEVER 1 2357 #define PNG_HANDLE_CHUNK_IF_SAFE 2 2358 #define PNG_HANDLE_CHUNK_ALWAYS 3 2359 2360 /* Added to version 1.2.0 */ 2361 2362 /* Strip the prepended error numbers ("#nnn ") from error and warning 2363 * messages before passing them to the error or warning handler. 2364 */ 2365 #ifdef PNG_ERROR_NUMBERS_SUPPORTED 2366 extern PNG_EXPORT(void,png_set_strip_error_numbers) PNGARG((png_structp 2367 png_ptr, png_uint_32 strip_mode)); 2368 #endif 2369 2370 /* Added at libpng-1.2.6 */ 2371 #ifdef PNG_SET_USER_LIMITS_SUPPORTED 2372 extern PNG_EXPORT(void,png_set_user_limits) PNGARG((png_structp 2373 png_ptr, png_uint_32 user_width_max, png_uint_32 user_height_max)); 2374 extern PNG_EXPORT(png_uint_32,png_get_user_width_max) PNGARG((png_structp 2375 png_ptr)); 2376 extern PNG_EXPORT(png_uint_32,png_get_user_height_max) PNGARG((png_structp 2377 png_ptr)); 2378 #endif 2379 /* Maintainer: Put new public prototypes here ^, in libpng.3, and in 2380 * project defs 2381 */ 2382 2383 #ifdef PNG_READ_COMPOSITE_NODIV_SUPPORTED 2384 /* With these routines we avoid an integer divide, which will be slower on 2385 * most machines. However, it does take more operations than the corresponding 2386 * divide method, so it may be slower on a few RISC systems. There are two 2387 * shifts (by 8 or 16 bits) and an addition, versus a single integer divide. 2388 * 2389 * Note that the rounding factors are NOT supposed to be the same! 128 and 2390 * 32768 are correct for the NODIV code; 127 and 32767 are correct for the 2391 * standard method. 2392 * 2393 * [Optimized code by Greg Roelofs and Mark Adler...blame us for bugs. :-) ] 2394 */ 2395 2396 /* fg and bg should be in `gamma 1.0' space; alpha is the opacity */ 2397 2398 # define png_composite(composite, fg, alpha, bg) \ 2399 { png_uint_16 temp = (png_uint_16)((png_uint_16)(fg) * (png_uint_16)(alpha) \ 2400 + (png_uint_16)(bg)*(png_uint_16)(255 - \ 2401 (png_uint_16)(alpha)) + (png_uint_16)128); \ 2402 (composite) = (png_byte)((temp + (temp >> 8)) >> 8); } 2403 2404 # define png_composite_16(composite, fg, alpha, bg) \ 2405 { png_uint_32 temp = (png_uint_32)((png_uint_32)(fg) * (png_uint_32)(alpha) \ 2406 + (png_uint_32)(bg)*(png_uint_32)(65535L - \ 2407 (png_uint_32)(alpha)) + (png_uint_32)32768L); \ 2408 (composite) = (png_uint_16)((temp + (temp >> 16)) >> 16); } 2409 2410 #else /* Standard method using integer division */ 2411 2412 # define png_composite(composite, fg, alpha, bg) \ 2413 (composite) = (png_byte)(((png_uint_16)(fg) * (png_uint_16)(alpha) + \ 2414 (png_uint_16)(bg) * (png_uint_16)(255 - (png_uint_16)(alpha)) + \ 2415 (png_uint_16)127) / 255) 2416 2417 # define png_composite_16(composite, fg, alpha, bg) \ 2418 (composite) = (png_uint_16)(((png_uint_32)(fg) * (png_uint_32)(alpha) + \ 2419 (png_uint_32)(bg)*(png_uint_32)(65535L - (png_uint_32)(alpha)) + \ 2420 (png_uint_32)32767) / (png_uint_32)65535L) 2421 2422 #endif /* PNG_READ_COMPOSITE_NODIV_SUPPORTED */ 2423 2424 /* Inline macros to do direct reads of bytes from the input buffer. These 2425 * require that you are using an architecture that uses PNG byte ordering 2426 * (MSB first) and supports unaligned data storage. I think that PowerPC 2427 * in big-endian mode and 680x0 are the only ones that will support this. 2428 * The x86 line of processors definitely do not. The png_get_int_32() 2429 * routine also assumes we are using two's complement format for negative 2430 * values, which is almost certainly true. 2431 */ 2432 #ifdef PNG_READ_BIG_ENDIAN_SUPPORTED 2433 # define png_get_uint_32(buf) ( *((png_uint_32p) (buf))) 2434 # define png_get_uint_16(buf) ( *((png_uint_16p) (buf))) 2435 # define png_get_int_32(buf) ( *((png_int_32p) (buf))) 2436 #else 2437 extern PNG_EXPORT(png_uint_32,png_get_uint_32) PNGARG((png_bytep buf)); 2438 extern PNG_EXPORT(png_uint_16,png_get_uint_16) PNGARG((png_bytep buf)); 2439 extern PNG_EXPORT(png_int_32,png_get_int_32) PNGARG((png_bytep buf)); 2440 #endif /* !PNG_READ_BIG_ENDIAN_SUPPORTED */ 2441 extern PNG_EXPORT(png_uint_32,png_get_uint_31) 2442 PNGARG((png_structp png_ptr, png_bytep buf)); 2443 /* No png_get_int_16 -- may be added if there's a real need for it. */ 2444 2445 /* Place a 32-bit number into a buffer in PNG byte order (big-endian). 2446 */ 2447 extern PNG_EXPORT(void,png_save_uint_32) 2448 PNGARG((png_bytep buf, png_uint_32 i)); 2449 extern PNG_EXPORT(void,png_save_int_32) 2450 PNGARG((png_bytep buf, png_int_32 i)); 2451 2452 /* Place a 16-bit number into a buffer in PNG byte order. 2453 * The parameter is declared unsigned int, not png_uint_16, 2454 * just to avoid potential problems on pre-ANSI C compilers. 2455 */ 2456 extern PNG_EXPORT(void,png_save_uint_16) 2457 PNGARG((png_bytep buf, unsigned int i)); 2458 /* No png_save_int_16 -- may be added if there's a real need for it. */ 2459 2460 /* ************************************************************************* */ 2461 2462 /* These next functions are used internally in the code. They generally 2463 * shouldn't be used unless you are writing code to add or replace some 2464 * functionality in libpng. More information about most functions can 2465 * be found in the files where the functions are located. 2466 */ 2467 2468 2469 /* Various modes of operation, that are visible to applications because 2470 * they are used for unknown chunk location. 2471 */ 2472 #define PNG_HAVE_IHDR 0x01 2473 #define PNG_HAVE_PLTE 0x02 2474 #define PNG_HAVE_IDAT 0x04 2475 #define PNG_AFTER_IDAT 0x08 /* Have complete zlib datastream */ 2476 #define PNG_HAVE_IEND 0x10 2477 2478 #ifdef PNG_INTERNAL 2479 2480 /* More modes of operation. Note that after an init, mode is set to 2481 * zero automatically when the structure is created. 2482 */ 2483 #define PNG_HAVE_gAMA 0x20 2484 #define PNG_HAVE_cHRM 0x40 2485 #define PNG_HAVE_sRGB 0x80 2486 #define PNG_HAVE_CHUNK_HEADER 0x100 2487 #define PNG_WROTE_tIME 0x200 2488 #define PNG_WROTE_INFO_BEFORE_PLTE 0x400 2489 #define PNG_BACKGROUND_IS_GRAY 0x800 2490 #define PNG_HAVE_PNG_SIGNATURE 0x1000 2491 #define PNG_HAVE_CHUNK_AFTER_IDAT 0x2000 /* Have another chunk after IDAT */ 2492 2493 /* Flags for the transformations the PNG library does on the image data */ 2494 #define PNG_BGR 0x0001 2495 #define PNG_INTERLACE 0x0002 2496 #define PNG_PACK 0x0004 2497 #define PNG_SHIFT 0x0008 2498 #define PNG_SWAP_BYTES 0x0010 2499 #define PNG_INVERT_MONO 0x0020 2500 #define PNG_DITHER 0x0040 2501 #define PNG_BACKGROUND 0x0080 2502 #define PNG_BACKGROUND_EXPAND 0x0100 2503 /* 0x0200 unused */ 2504 #define PNG_16_TO_8 0x0400 2505 #define PNG_RGBA 0x0800 2506 #define PNG_EXPAND 0x1000 2507 #define PNG_GAMMA 0x2000 2508 #define PNG_GRAY_TO_RGB 0x4000 2509 #define PNG_FILLER 0x8000L 2510 #define PNG_PACKSWAP 0x10000L 2511 #define PNG_SWAP_ALPHA 0x20000L 2512 #define PNG_STRIP_ALPHA 0x40000L 2513 #define PNG_INVERT_ALPHA 0x80000L 2514 #define PNG_USER_TRANSFORM 0x100000L 2515 #define PNG_RGB_TO_GRAY_ERR 0x200000L 2516 #define PNG_RGB_TO_GRAY_WARN 0x400000L 2517 #define PNG_RGB_TO_GRAY 0x600000L /* two bits, RGB_TO_GRAY_ERR|WARN */ 2518 /* 0x800000L Unused */ 2519 #define PNG_ADD_ALPHA 0x1000000L /* Added to libpng-1.2.7 */ 2520 #define PNG_EXPAND_tRNS 0x2000000L /* Added to libpng-1.2.9 */ 2521 #define PNG_PREMULTIPLY_ALPHA 0x4000000L /* Added to libpng-1.2.41 */ 2522 /* by volker */ 2523 /* 0x8000000L unused */ 2524 /* 0x10000000L unused */ 2525 /* 0x20000000L unused */ 2526 /* 0x40000000L unused */ 2527 2528 /* Flags for png_create_struct */ 2529 #define PNG_STRUCT_PNG 0x0001 2530 #define PNG_STRUCT_INFO 0x0002 2531 2532 /* Scaling factor for filter heuristic weighting calculations */ 2533 #define PNG_WEIGHT_SHIFT 8 2534 #define PNG_WEIGHT_FACTOR (1<<(PNG_WEIGHT_SHIFT)) 2535 #define PNG_COST_SHIFT 3 2536 #define PNG_COST_FACTOR (1<<(PNG_COST_SHIFT)) 2537 2538 /* Flags for the png_ptr->flags rather than declaring a byte for each one */ 2539 #define PNG_FLAG_ZLIB_CUSTOM_STRATEGY 0x0001 2540 #define PNG_FLAG_ZLIB_CUSTOM_LEVEL 0x0002 2541 #define PNG_FLAG_ZLIB_CUSTOM_MEM_LEVEL 0x0004 2542 #define PNG_FLAG_ZLIB_CUSTOM_WINDOW_BITS 0x0008 2543 #define PNG_FLAG_ZLIB_CUSTOM_METHOD 0x0010 2544 #define PNG_FLAG_ZLIB_FINISHED 0x0020 2545 #define PNG_FLAG_ROW_INIT 0x0040 2546 #define PNG_FLAG_FILLER_AFTER 0x0080 2547 #define PNG_FLAG_CRC_ANCILLARY_USE 0x0100 2548 #define PNG_FLAG_CRC_ANCILLARY_NOWARN 0x0200 2549 #define PNG_FLAG_CRC_CRITICAL_USE 0x0400 2550 #define PNG_FLAG_CRC_CRITICAL_IGNORE 0x0800 2551 #define PNG_FLAG_FREE_PLTE 0x1000 2552 #define PNG_FLAG_FREE_TRNS 0x2000 2553 #define PNG_FLAG_FREE_HIST 0x4000 2554 #define PNG_FLAG_KEEP_UNKNOWN_CHUNKS 0x8000L 2555 #define PNG_FLAG_KEEP_UNSAFE_CHUNKS 0x10000L 2556 #define PNG_FLAG_LIBRARY_MISMATCH 0x20000L 2557 #define PNG_FLAG_STRIP_ERROR_NUMBERS 0x40000L 2558 #define PNG_FLAG_STRIP_ERROR_TEXT 0x80000L 2559 #define PNG_FLAG_MALLOC_NULL_MEM_OK 0x100000L 2560 #define PNG_FLAG_ADD_ALPHA 0x200000L /* Added to libpng-1.2.8 */ 2561 #define PNG_FLAG_STRIP_ALPHA 0x400000L /* Added to libpng-1.2.8 */ 2562 /* 0x800000L unused */ 2563 /* 0x1000000L unused */ 2564 /* 0x2000000L unused */ 2565 /* 0x4000000L unused */ 2566 /* 0x8000000L unused */ 2567 /* 0x10000000L unused */ 2568 /* 0x20000000L unused */ 2569 /* 0x40000000L unused */ 2570 2571 #define PNG_FLAG_CRC_ANCILLARY_MASK (PNG_FLAG_CRC_ANCILLARY_USE | \ 2572 PNG_FLAG_CRC_ANCILLARY_NOWARN) 2573 2574 #define PNG_FLAG_CRC_CRITICAL_MASK (PNG_FLAG_CRC_CRITICAL_USE | \ 2575 PNG_FLAG_CRC_CRITICAL_IGNORE) 2576 2577 #define PNG_FLAG_CRC_MASK (PNG_FLAG_CRC_ANCILLARY_MASK | \ 2578 PNG_FLAG_CRC_CRITICAL_MASK) 2579 2580 /* Save typing and make code easier to understand */ 2581 2582 #define PNG_COLOR_DIST(c1, c2) (abs((int)((c1).red) - (int)((c2).red)) + \ 2583 abs((int)((c1).green) - (int)((c2).green)) + \ 2584 abs((int)((c1).blue) - (int)((c2).blue))) 2585 2586 /* Added to libpng-1.2.6 JB */ 2587 #define PNG_ROWBYTES(pixel_bits, width) \ 2588 ((pixel_bits) >= 8 ? \ 2589 ((width) * (((png_uint_32)(pixel_bits)) >> 3)) : \ 2590 (( ((width) * ((png_uint_32)(pixel_bits))) + 7) >> 3) ) 2591 2592 /* PNG_OUT_OF_RANGE returns true if value is outside the range 2593 * ideal-delta..ideal+delta. Each argument is evaluated twice. 2594 * "ideal" and "delta" should be constants, normally simple 2595 * integers, "value" a variable. Added to libpng-1.2.6 JB 2596 */ 2597 #define PNG_OUT_OF_RANGE(value, ideal, delta) \ 2598 ( (value) < (ideal)-(delta) || (value) > (ideal)+(delta) ) 2599 2600 /* Variables declared in png.c - only it needs to define PNG_NO_EXTERN */ 2601 #if !defined(PNG_NO_EXTERN) || defined(PNG_ALWAYS_EXTERN) 2602 /* Place to hold the signature string for a PNG file. */ 2603 #ifdef PNG_USE_GLOBAL_ARRAYS 2604 PNG_EXPORT_VAR (PNG_CONST png_byte FARDATA) png_sig[8]; 2605 #else 2606 #endif 2607 #endif /* PNG_NO_EXTERN */ 2608 2609 /* Constant strings for known chunk types. If you need to add a chunk, 2610 * define the name here, and add an invocation of the macro in png.c and 2611 * wherever it's needed. 2612 */ 2613 #define PNG_IHDR png_byte png_IHDR[5] = { 73, 72, 68, 82, '\0'} 2614 #define PNG_IDAT png_byte png_IDAT[5] = { 73, 68, 65, 84, '\0'} 2615 #define PNG_IEND png_byte png_IEND[5] = { 73, 69, 78, 68, '\0'} 2616 #define PNG_PLTE png_byte png_PLTE[5] = { 80, 76, 84, 69, '\0'} 2617 #define PNG_bKGD png_byte png_bKGD[5] = { 98, 75, 71, 68, '\0'} 2618 #define PNG_cHRM png_byte png_cHRM[5] = { 99, 72, 82, 77, '\0'} 2619 #define PNG_gAMA png_byte png_gAMA[5] = {103, 65, 77, 65, '\0'} 2620 #define PNG_hIST png_byte png_hIST[5] = {104, 73, 83, 84, '\0'} 2621 #define PNG_iCCP png_byte png_iCCP[5] = {105, 67, 67, 80, '\0'} 2622 #define PNG_iTXt png_byte png_iTXt[5] = {105, 84, 88, 116, '\0'} 2623 #define PNG_oFFs png_byte png_oFFs[5] = {111, 70, 70, 115, '\0'} 2624 #define PNG_pCAL png_byte png_pCAL[5] = {112, 67, 65, 76, '\0'} 2625 #define PNG_sCAL png_byte png_sCAL[5] = {115, 67, 65, 76, '\0'} 2626 #define PNG_pHYs png_byte png_pHYs[5] = {112, 72, 89, 115, '\0'} 2627 #define PNG_sBIT png_byte png_sBIT[5] = {115, 66, 73, 84, '\0'} 2628 #define PNG_sPLT png_byte png_sPLT[5] = {115, 80, 76, 84, '\0'} 2629 #define PNG_sRGB png_byte png_sRGB[5] = {115, 82, 71, 66, '\0'} 2630 #define PNG_tEXt png_byte png_tEXt[5] = {116, 69, 88, 116, '\0'} 2631 #define PNG_tIME png_byte png_tIME[5] = {116, 73, 77, 69, '\0'} 2632 #define PNG_tRNS png_byte png_tRNS[5] = {116, 82, 78, 83, '\0'} 2633 #define PNG_zTXt png_byte png_zTXt[5] = {122, 84, 88, 116, '\0'} 2634 2635 #ifdef PNG_USE_GLOBAL_ARRAYS 2636 PNG_EXPORT_VAR (png_byte FARDATA) png_IHDR[5]; 2637 PNG_EXPORT_VAR (png_byte FARDATA) png_IDAT[5]; 2638 PNG_EXPORT_VAR (png_byte FARDATA) png_IEND[5]; 2639 PNG_EXPORT_VAR (png_byte FARDATA) png_PLTE[5]; 2640 PNG_EXPORT_VAR (png_byte FARDATA) png_bKGD[5]; 2641 PNG_EXPORT_VAR (png_byte FARDATA) png_cHRM[5]; 2642 PNG_EXPORT_VAR (png_byte FARDATA) png_gAMA[5]; 2643 PNG_EXPORT_VAR (png_byte FARDATA) png_hIST[5]; 2644 PNG_EXPORT_VAR (png_byte FARDATA) png_iCCP[5]; 2645 PNG_EXPORT_VAR (png_byte FARDATA) png_iTXt[5]; 2646 PNG_EXPORT_VAR (png_byte FARDATA) png_oFFs[5]; 2647 PNG_EXPORT_VAR (png_byte FARDATA) png_pCAL[5]; 2648 PNG_EXPORT_VAR (png_byte FARDATA) png_sCAL[5]; 2649 PNG_EXPORT_VAR (png_byte FARDATA) png_pHYs[5]; 2650 PNG_EXPORT_VAR (png_byte FARDATA) png_sBIT[5]; 2651 PNG_EXPORT_VAR (png_byte FARDATA) png_sPLT[5]; 2652 PNG_EXPORT_VAR (png_byte FARDATA) png_sRGB[5]; 2653 PNG_EXPORT_VAR (png_byte FARDATA) png_tEXt[5]; 2654 PNG_EXPORT_VAR (png_byte FARDATA) png_tIME[5]; 2655 PNG_EXPORT_VAR (png_byte FARDATA) png_tRNS[5]; 2656 PNG_EXPORT_VAR (png_byte FARDATA) png_zTXt[5]; 2657 #endif /* PNG_USE_GLOBAL_ARRAYS */ 2658 2659 #if defined(PNG_1_0_X) || defined (PNG_1_2_X) 2660 /* Initialize png_ptr struct for reading, and allocate any other memory. 2661 * (old interface - DEPRECATED - use png_create_read_struct instead). 2662 */ 2663 extern PNG_EXPORT(void,png_read_init) PNGARG((png_structp png_ptr)) 2664 PNG_DEPRECATED; 2665 #undef png_read_init 2666 #define png_read_init(png_ptr) png_read_init_3(&png_ptr, \ 2667 PNG_LIBPNG_VER_STRING, png_sizeof(png_struct)); 2668 #endif 2669 2670 extern PNG_EXPORT(void,png_read_init_3) PNGARG((png_structpp ptr_ptr, 2671 png_const_charp user_png_ver, png_size_t png_struct_size)); 2672 #if defined(PNG_1_0_X) || defined (PNG_1_2_X) 2673 extern PNG_EXPORT(void,png_read_init_2) PNGARG((png_structp png_ptr, 2674 png_const_charp user_png_ver, png_size_t png_struct_size, png_size_t 2675 png_info_size)); 2676 #endif 2677 2678 #if defined(PNG_1_0_X) || defined (PNG_1_2_X) 2679 /* Initialize png_ptr struct for writing, and allocate any other memory. 2680 * (old interface - DEPRECATED - use png_create_write_struct instead). 2681 */ 2682 extern PNG_EXPORT(void,png_write_init) PNGARG((png_structp png_ptr)) 2683 PNG_DEPRECATED; 2684 #undef png_write_init 2685 #define png_write_init(png_ptr) png_write_init_3(&png_ptr, \ 2686 PNG_LIBPNG_VER_STRING, png_sizeof(png_struct)); 2687 #endif 2688 2689 extern PNG_EXPORT(void,png_write_init_3) PNGARG((png_structpp ptr_ptr, 2690 png_const_charp user_png_ver, png_size_t png_struct_size)); 2691 extern PNG_EXPORT(void,png_write_init_2) PNGARG((png_structp png_ptr, 2692 png_const_charp user_png_ver, png_size_t png_struct_size, png_size_t 2693 png_info_size)); 2694 2695 /* Allocate memory for an internal libpng struct */ 2696 PNG_EXTERN png_voidp png_create_struct PNGARG((int type)) PNG_PRIVATE; 2697 2698 /* Free memory from internal libpng struct */ 2699 PNG_EXTERN void png_destroy_struct PNGARG((png_voidp struct_ptr)) PNG_PRIVATE; 2700 2701 PNG_EXTERN png_voidp png_create_struct_2 PNGARG((int type, png_malloc_ptr 2702 malloc_fn, png_voidp mem_ptr)) PNG_PRIVATE; 2703 PNG_EXTERN void png_destroy_struct_2 PNGARG((png_voidp struct_ptr, 2704 png_free_ptr free_fn, png_voidp mem_ptr)) PNG_PRIVATE; 2705 2706 /* Free any memory that info_ptr points to and reset struct. */ 2707 PNG_EXTERN void png_info_destroy PNGARG((png_structp png_ptr, 2708 png_infop info_ptr)) PNG_PRIVATE; 2709 2710 #ifndef PNG_1_0_X 2711 /* Function to allocate memory for zlib. */ 2712 PNG_EXTERN voidpf png_zalloc PNGARG((voidpf png_ptr, uInt items, 2713 uInt size)) PNG_PRIVATE; 2714 2715 /* Function to free memory for zlib */ 2716 PNG_EXTERN void png_zfree PNGARG((voidpf png_ptr, voidpf ptr)) PNG_PRIVATE; 2717 2718 #ifdef PNG_SIZE_T 2719 /* Function to convert a sizeof an item to png_sizeof item */ 2720 PNG_EXTERN png_size_t PNGAPI png_convert_size PNGARG((size_t size)) 2721 PNG_PRIVATE; 2722 #endif 2723 2724 /* Next four functions are used internally as callbacks. PNGAPI is required 2725 * but not PNG_EXPORT. PNGAPI added at libpng version 1.2.3. 2726 */ 2727 2728 PNG_EXTERN void PNGAPI png_default_read_data PNGARG((png_structp png_ptr, 2729 png_bytep data, png_size_t length)) PNG_PRIVATE; 2730 2731 #ifdef PNG_PROGRESSIVE_READ_SUPPORTED 2732 PNG_EXTERN void PNGAPI png_push_fill_buffer PNGARG((png_structp png_ptr, 2733 png_bytep buffer, png_size_t length)) PNG_PRIVATE; 2734 #endif 2735 2736 PNG_EXTERN void PNGAPI png_default_write_data PNGARG((png_structp png_ptr, 2737 png_bytep data, png_size_t length)) PNG_PRIVATE; 2738 2739 #ifdef PNG_WRITE_FLUSH_SUPPORTED 2740 #ifdef PNG_STDIO_SUPPORTED 2741 PNG_EXTERN void PNGAPI png_default_flush PNGARG((png_structp png_ptr)) 2742 PNG_PRIVATE; 2743 #endif 2744 #endif 2745 #else /* PNG_1_0_X */ 2746 #ifdef PNG_PROGRESSIVE_READ_SUPPORTED 2747 PNG_EXTERN void png_push_fill_buffer PNGARG((png_structp png_ptr, 2748 png_bytep buffer, png_size_t length)) PNG_PRIVATE; 2749 #endif 2750 #endif /* PNG_1_0_X */ 2751 2752 /* Reset the CRC variable */ 2753 PNG_EXTERN void png_reset_crc PNGARG((png_structp png_ptr)) PNG_PRIVATE; 2754 2755 /* Write the "data" buffer to whatever output you are using. */ 2756 PNG_EXTERN void png_write_data PNGARG((png_structp png_ptr, png_bytep data, 2757 png_size_t length)) PNG_PRIVATE; 2758 2759 /* Read data from whatever input you are using into the "data" buffer */ 2760 PNG_EXTERN void png_read_data PNGARG((png_structp png_ptr, png_bytep data, 2761 png_size_t length)) PNG_PRIVATE; 2762 2763 /* Read bytes into buf, and update png_ptr->crc */ 2764 PNG_EXTERN void png_crc_read PNGARG((png_structp png_ptr, png_bytep buf, 2765 png_size_t length)) PNG_PRIVATE; 2766 2767 /* Decompress data in a chunk that uses compression */ 2768 #if defined(PNG_zTXt_SUPPORTED) || defined(PNG_iTXt_SUPPORTED) || \ 2769 defined(PNG_iCCP_SUPPORTED) || defined(PNG_sPLT_SUPPORTED) 2770 PNG_EXTERN void png_decompress_chunk PNGARG((png_structp png_ptr, 2771 int comp_type, png_size_t chunklength, 2772 png_size_t prefix_length, png_size_t *data_length)) PNG_PRIVATE; 2773 #endif 2774 2775 /* Read "skip" bytes, read the file crc, and (optionally) verify png_ptr->crc */ 2776 PNG_EXTERN int png_crc_finish PNGARG((png_structp png_ptr, png_uint_32 skip) 2777 PNG_PRIVATE); 2778 2779 /* Read the CRC from the file and compare it to the libpng calculated CRC */ 2780 PNG_EXTERN int png_crc_error PNGARG((png_structp png_ptr)) PNG_PRIVATE; 2781 2782 /* Calculate the CRC over a section of data. Note that we are only 2783 * passing a maximum of 64K on systems that have this as a memory limit, 2784 * since this is the maximum buffer size we can specify. 2785 */ 2786 PNG_EXTERN void png_calculate_crc PNGARG((png_structp png_ptr, png_bytep ptr, 2787 png_size_t length)) PNG_PRIVATE; 2788 2789 #ifdef PNG_WRITE_FLUSH_SUPPORTED 2790 PNG_EXTERN void png_flush PNGARG((png_structp png_ptr)) PNG_PRIVATE; 2791 #endif 2792 2793 /* Simple function to write the signature */ 2794 PNG_EXTERN void png_write_sig PNGARG((png_structp png_ptr)) PNG_PRIVATE; 2795 2796 /* Write various chunks */ 2797 2798 /* Write the IHDR chunk, and update the png_struct with the necessary 2799 * information. 2800 */ 2801 PNG_EXTERN void png_write_IHDR PNGARG((png_structp png_ptr, png_uint_32 width, 2802 png_uint_32 height, 2803 int bit_depth, int color_type, int compression_method, int filter_method, 2804 int interlace_method)) PNG_PRIVATE; 2805 2806 PNG_EXTERN void png_write_PLTE PNGARG((png_structp png_ptr, png_colorp palette, 2807 png_uint_32 num_pal)) PNG_PRIVATE; 2808 2809 PNG_EXTERN void png_write_IDAT PNGARG((png_structp png_ptr, png_bytep data, 2810 png_size_t length)) PNG_PRIVATE; 2811 2812 PNG_EXTERN void png_write_IEND PNGARG((png_structp png_ptr)) PNG_PRIVATE; 2813 2814 #ifdef PNG_WRITE_gAMA_SUPPORTED 2815 #ifdef PNG_FLOATING_POINT_SUPPORTED 2816 PNG_EXTERN void png_write_gAMA PNGARG((png_structp png_ptr, double file_gamma)) 2817 PNG_PRIVATE; 2818 #endif 2819 #ifdef PNG_FIXED_POINT_SUPPORTED 2820 PNG_EXTERN void png_write_gAMA_fixed PNGARG((png_structp png_ptr, 2821 png_fixed_point file_gamma)) PNG_PRIVATE; 2822 #endif 2823 #endif 2824 2825 #ifdef PNG_WRITE_sBIT_SUPPORTED 2826 PNG_EXTERN void png_write_sBIT PNGARG((png_structp png_ptr, png_color_8p sbit, 2827 int color_type)) PNG_PRIVATE; 2828 #endif 2829 2830 #ifdef PNG_WRITE_cHRM_SUPPORTED 2831 #ifdef PNG_FLOATING_POINT_SUPPORTED 2832 PNG_EXTERN void png_write_cHRM PNGARG((png_structp png_ptr, 2833 double white_x, double white_y, 2834 double red_x, double red_y, double green_x, double green_y, 2835 double blue_x, double blue_y)) PNG_PRIVATE; 2836 #endif 2837 #ifdef PNG_FIXED_POINT_SUPPORTED 2838 PNG_EXTERN void png_write_cHRM_fixed PNGARG((png_structp png_ptr, 2839 png_fixed_point int_white_x, png_fixed_point int_white_y, 2840 png_fixed_point int_red_x, png_fixed_point int_red_y, png_fixed_point 2841 int_green_x, png_fixed_point int_green_y, png_fixed_point int_blue_x, 2842 png_fixed_point int_blue_y)) PNG_PRIVATE; 2843 #endif 2844 #endif 2845 2846 #ifdef PNG_WRITE_sRGB_SUPPORTED 2847 PNG_EXTERN void png_write_sRGB PNGARG((png_structp png_ptr, 2848 int intent)) PNG_PRIVATE; 2849 #endif 2850 2851 #ifdef PNG_WRITE_iCCP_SUPPORTED 2852 PNG_EXTERN void png_write_iCCP PNGARG((png_structp png_ptr, 2853 png_charp name, int compression_type, 2854 png_charp profile, int proflen)) PNG_PRIVATE; 2855 /* Note to maintainer: profile should be png_bytep */ 2856 #endif 2857 2858 #ifdef PNG_WRITE_sPLT_SUPPORTED 2859 PNG_EXTERN void png_write_sPLT PNGARG((png_structp png_ptr, 2860 png_sPLT_tp palette)) PNG_PRIVATE; 2861 #endif 2862 2863 #ifdef PNG_WRITE_tRNS_SUPPORTED 2864 PNG_EXTERN void png_write_tRNS PNGARG((png_structp png_ptr, png_bytep trans, 2865 png_color_16p values, int number, int color_type)) PNG_PRIVATE; 2866 #endif 2867 2868 #ifdef PNG_WRITE_bKGD_SUPPORTED 2869 PNG_EXTERN void png_write_bKGD PNGARG((png_structp png_ptr, 2870 png_color_16p values, int color_type)) PNG_PRIVATE; 2871 #endif 2872 2873 #ifdef PNG_WRITE_hIST_SUPPORTED 2874 PNG_EXTERN void png_write_hIST PNGARG((png_structp png_ptr, png_uint_16p hist, 2875 int num_hist)) PNG_PRIVATE; 2876 #endif 2877 2878 #if defined(PNG_WRITE_TEXT_SUPPORTED) || defined(PNG_WRITE_pCAL_SUPPORTED) || \ 2879 defined(PNG_WRITE_iCCP_SUPPORTED) || defined(PNG_WRITE_sPLT_SUPPORTED) 2880 PNG_EXTERN png_size_t png_check_keyword PNGARG((png_structp png_ptr, 2881 png_charp key, png_charpp new_key)) PNG_PRIVATE; 2882 #endif 2883 2884 #ifdef PNG_WRITE_tEXt_SUPPORTED 2885 PNG_EXTERN void png_write_tEXt PNGARG((png_structp png_ptr, png_charp key, 2886 png_charp text, png_size_t text_len)) PNG_PRIVATE; 2887 #endif 2888 2889 #ifdef PNG_WRITE_zTXt_SUPPORTED 2890 PNG_EXTERN void png_write_zTXt PNGARG((png_structp png_ptr, png_charp key, 2891 png_charp text, png_size_t text_len, int compression)) PNG_PRIVATE; 2892 #endif 2893 2894 #ifdef PNG_WRITE_iTXt_SUPPORTED 2895 PNG_EXTERN void png_write_iTXt PNGARG((png_structp png_ptr, 2896 int compression, png_charp key, png_charp lang, png_charp lang_key, 2897 png_charp text)) PNG_PRIVATE; 2898 #endif 2899 2900 #ifdef PNG_TEXT_SUPPORTED /* Added at version 1.0.14 and 1.2.4 */ 2901 PNG_EXTERN int png_set_text_2 PNGARG((png_structp png_ptr, 2902 png_infop info_ptr, png_textp text_ptr, int num_text)) PNG_PRIVATE; 2903 #endif 2904 2905 #ifdef PNG_WRITE_oFFs_SUPPORTED 2906 PNG_EXTERN void png_write_oFFs PNGARG((png_structp png_ptr, 2907 png_int_32 x_offset, png_int_32 y_offset, int unit_type)) PNG_PRIVATE; 2908 #endif 2909 2910 #ifdef PNG_WRITE_pCAL_SUPPORTED 2911 PNG_EXTERN void png_write_pCAL PNGARG((png_structp png_ptr, png_charp purpose, 2912 png_int_32 X0, png_int_32 X1, int type, int nparams, 2913 png_charp units, png_charpp params)) PNG_PRIVATE; 2914 #endif 2915 2916 #ifdef PNG_WRITE_pHYs_SUPPORTED 2917 PNG_EXTERN void png_write_pHYs PNGARG((png_structp png_ptr, 2918 png_uint_32 x_pixels_per_unit, png_uint_32 y_pixels_per_unit, 2919 int unit_type)) PNG_PRIVATE; 2920 #endif 2921 2922 #ifdef PNG_WRITE_tIME_SUPPORTED 2923 PNG_EXTERN void png_write_tIME PNGARG((png_structp png_ptr, 2924 png_timep mod_time)) PNG_PRIVATE; 2925 #endif 2926 2927 #ifdef PNG_WRITE_sCAL_SUPPORTED 2928 #if defined(PNG_FLOATING_POINT_SUPPORTED) && !defined(PNG_NO_STDIO) 2929 PNG_EXTERN void png_write_sCAL PNGARG((png_structp png_ptr, 2930 int unit, double width, double height)) PNG_PRIVATE; 2931 #else 2932 #ifdef PNG_FIXED_POINT_SUPPORTED 2933 PNG_EXTERN void png_write_sCAL_s PNGARG((png_structp png_ptr, 2934 int unit, png_charp width, png_charp height)) PNG_PRIVATE; 2935 #endif 2936 #endif 2937 #endif 2938 2939 /* Called when finished processing a row of data */ 2940 PNG_EXTERN void png_write_finish_row PNGARG((png_structp png_ptr)) PNG_PRIVATE; 2941 2942 /* Internal use only. Called before first row of data */ 2943 PNG_EXTERN void png_write_start_row PNGARG((png_structp png_ptr)) PNG_PRIVATE; 2944 2945 #ifdef PNG_READ_GAMMA_SUPPORTED 2946 PNG_EXTERN void png_build_gamma_table PNGARG((png_structp png_ptr)) PNG_PRIVATE; 2947 #endif 2948 2949 /* Combine a row of data, dealing with alpha, etc. if requested */ 2950 PNG_EXTERN void png_combine_row PNGARG((png_structp png_ptr, png_bytep row, 2951 int mask)) PNG_PRIVATE; 2952 2953 #ifdef PNG_READ_INTERLACING_SUPPORTED 2954 /* Expand an interlaced row */ 2955 /* OLD pre-1.0.9 interface: 2956 PNG_EXTERN void png_do_read_interlace PNGARG((png_row_infop row_info, 2957 png_bytep row, int pass, png_uint_32 transformations)) PNG_PRIVATE; 2958 */ 2959 PNG_EXTERN void png_do_read_interlace PNGARG((png_structp png_ptr)) PNG_PRIVATE; 2960 #endif 2961 2962 /* GRR TO DO (2.0 or whenever): simplify other internal calling interfaces */ 2963 2964 #ifdef PNG_WRITE_INTERLACING_SUPPORTED 2965 /* Grab pixels out of a row for an interlaced pass */ 2966 PNG_EXTERN void png_do_write_interlace PNGARG((png_row_infop row_info, 2967 png_bytep row, int pass)) PNG_PRIVATE; 2968 #endif 2969 2970 /* Unfilter a row */ 2971 PNG_EXTERN void png_read_filter_row PNGARG((png_structp png_ptr, 2972 png_row_infop row_info, png_bytep row, png_bytep prev_row, 2973 int filter)) PNG_PRIVATE; 2974 2975 /* Choose the best filter to use and filter the row data */ 2976 PNG_EXTERN void png_write_find_filter PNGARG((png_structp png_ptr, 2977 png_row_infop row_info)) PNG_PRIVATE; 2978 2979 /* Write out the filtered row. */ 2980 PNG_EXTERN void png_write_filtered_row PNGARG((png_structp png_ptr, 2981 png_bytep filtered_row)) PNG_PRIVATE; 2982 /* Finish a row while reading, dealing with interlacing passes, etc. */ 2983 PNG_EXTERN void png_read_finish_row PNGARG((png_structp png_ptr)); 2984 2985 /* Initialize the row buffers, etc. */ 2986 PNG_EXTERN void png_read_start_row PNGARG((png_structp png_ptr)) PNG_PRIVATE; 2987 /* Optional call to update the users info structure */ 2988 PNG_EXTERN void png_read_transform_info PNGARG((png_structp png_ptr, 2989 png_infop info_ptr)) PNG_PRIVATE; 2990 2991 /* These are the functions that do the transformations */ 2992 #ifdef PNG_READ_FILLER_SUPPORTED 2993 PNG_EXTERN void png_do_read_filler PNGARG((png_row_infop row_info, 2994 png_bytep row, png_uint_32 filler, png_uint_32 flags)) PNG_PRIVATE; 2995 #endif 2996 2997 #ifdef PNG_READ_SWAP_ALPHA_SUPPORTED 2998 PNG_EXTERN void png_do_read_swap_alpha PNGARG((png_row_infop row_info, 2999 png_bytep row)) PNG_PRIVATE; 3000 #endif 3001 3002 #ifdef PNG_WRITE_SWAP_ALPHA_SUPPORTED 3003 PNG_EXTERN void png_do_write_swap_alpha PNGARG((png_row_infop row_info, 3004 png_bytep row)) PNG_PRIVATE; 3005 #endif 3006 3007 #ifdef PNG_READ_INVERT_ALPHA_SUPPORTED 3008 PNG_EXTERN void png_do_read_invert_alpha PNGARG((png_row_infop row_info, 3009 png_bytep row)) PNG_PRIVATE; 3010 #endif 3011 3012 #ifdef PNG_WRITE_INVERT_ALPHA_SUPPORTED 3013 PNG_EXTERN void png_do_write_invert_alpha PNGARG((png_row_infop row_info, 3014 png_bytep row)) PNG_PRIVATE; 3015 #endif 3016 3017 #if defined(PNG_WRITE_FILLER_SUPPORTED) || \ 3018 defined(PNG_READ_STRIP_ALPHA_SUPPORTED) 3019 PNG_EXTERN void png_do_strip_filler PNGARG((png_row_infop row_info, 3020 png_bytep row, png_uint_32 flags)) PNG_PRIVATE; 3021 #endif 3022 3023 #if defined(PNG_READ_SWAP_SUPPORTED) || defined(PNG_WRITE_SWAP_SUPPORTED) 3024 PNG_EXTERN void png_do_swap PNGARG((png_row_infop row_info, 3025 png_bytep row)) PNG_PRIVATE; 3026 #endif 3027 3028 #if defined(PNG_READ_PACKSWAP_SUPPORTED) || defined(PNG_WRITE_PACKSWAP_SUPPORTED) 3029 PNG_EXTERN void png_do_packswap PNGARG((png_row_infop row_info, 3030 png_bytep row)) PNG_PRIVATE; 3031 #endif 3032 3033 #ifdef PNG_READ_RGB_TO_GRAY_SUPPORTED 3034 PNG_EXTERN int png_do_rgb_to_gray PNGARG((png_structp png_ptr, png_row_infop 3035 row_info, png_bytep row)) PNG_PRIVATE; 3036 #endif 3037 3038 #ifdef PNG_READ_GRAY_TO_RGB_SUPPORTED 3039 PNG_EXTERN void png_do_gray_to_rgb PNGARG((png_row_infop row_info, 3040 png_bytep row)) PNG_PRIVATE; 3041 #endif 3042 3043 #ifdef PNG_READ_PACK_SUPPORTED 3044 PNG_EXTERN void png_do_unpack PNGARG((png_row_infop row_info, 3045 png_bytep row)) PNG_PRIVATE; 3046 #endif 3047 3048 #ifdef PNG_READ_SHIFT_SUPPORTED 3049 PNG_EXTERN void png_do_unshift PNGARG((png_row_infop row_info, png_bytep row, 3050 png_color_8p sig_bits)) PNG_PRIVATE; 3051 #endif 3052 3053 #if defined(PNG_READ_INVERT_SUPPORTED) || defined(PNG_WRITE_INVERT_SUPPORTED) 3054 PNG_EXTERN void png_do_invert PNGARG((png_row_infop row_info, 3055 png_bytep row)) PNG_PRIVATE; 3056 #endif 3057 3058 #ifdef PNG_READ_16_TO_8_SUPPORTED 3059 PNG_EXTERN void png_do_chop PNGARG((png_row_infop row_info, 3060 png_bytep row)) PNG_PRIVATE; 3061 #endif 3062 3063 #ifdef PNG_READ_DITHER_SUPPORTED 3064 PNG_EXTERN void png_do_dither PNGARG((png_row_infop row_info, 3065 png_bytep row, png_bytep palette_lookup, 3066 png_bytep dither_lookup)) PNG_PRIVATE; 3067 3068 # ifdef PNG_CORRECT_PALETTE_SUPPORTED 3069 PNG_EXTERN void png_correct_palette PNGARG((png_structp png_ptr, 3070 png_colorp palette, int num_palette)) PNG_PRIVATE; 3071 # endif 3072 #endif 3073 3074 #if defined(PNG_READ_BGR_SUPPORTED) || defined(PNG_WRITE_BGR_SUPPORTED) 3075 PNG_EXTERN void png_do_bgr PNGARG((png_row_infop row_info, 3076 png_bytep row)) PNG_PRIVATE; 3077 #endif 3078 3079 #ifdef PNG_WRITE_PACK_SUPPORTED 3080 PNG_EXTERN void png_do_pack PNGARG((png_row_infop row_info, 3081 png_bytep row, png_uint_32 bit_depth)) PNG_PRIVATE; 3082 #endif 3083 3084 #ifdef PNG_WRITE_SHIFT_SUPPORTED 3085 PNG_EXTERN void png_do_shift PNGARG((png_row_infop row_info, png_bytep row, 3086 png_color_8p bit_depth)) PNG_PRIVATE; 3087 #endif 3088 3089 #ifdef PNG_READ_BACKGROUND_SUPPORTED 3090 #ifdef PNG_READ_GAMMA_SUPPORTED 3091 PNG_EXTERN void png_do_background PNGARG((png_row_infop row_info, png_bytep row, 3092 png_color_16p trans_values, png_color_16p background, 3093 png_color_16p background_1, 3094 png_bytep gamma_table, png_bytep gamma_from_1, png_bytep gamma_to_1, 3095 png_uint_16pp gamma_16, png_uint_16pp gamma_16_from_1, 3096 png_uint_16pp gamma_16_to_1, int gamma_shift)) PNG_PRIVATE; 3097 #else 3098 PNG_EXTERN void png_do_background PNGARG((png_row_infop row_info, png_bytep row, 3099 png_color_16p trans_values, png_color_16p background)) PNG_PRIVATE; 3100 #endif 3101 #endif 3102 3103 #ifdef PNG_READ_GAMMA_SUPPORTED 3104 PNG_EXTERN void png_do_gamma PNGARG((png_row_infop row_info, png_bytep row, 3105 png_bytep gamma_table, png_uint_16pp gamma_16_table, 3106 int gamma_shift)) PNG_PRIVATE; 3107 #endif 3108 3109 #ifdef PNG_READ_EXPAND_SUPPORTED 3110 PNG_EXTERN void png_do_expand_palette PNGARG((png_row_infop row_info, 3111 png_bytep row, png_colorp palette, png_bytep trans, 3112 int num_trans)) PNG_PRIVATE; 3113 PNG_EXTERN void png_do_expand PNGARG((png_row_infop row_info, 3114 png_bytep row, png_color_16p trans_value)) PNG_PRIVATE; 3115 #endif 3116 3117 /* The following decodes the appropriate chunks, and does error correction, 3118 * then calls the appropriate callback for the chunk if it is valid. 3119 */ 3120 3121 /* Decode the IHDR chunk */ 3122 PNG_EXTERN void png_handle_IHDR PNGARG((png_structp png_ptr, png_infop info_ptr, 3123 png_uint_32 length)) PNG_PRIVATE; 3124 PNG_EXTERN void png_handle_PLTE PNGARG((png_structp png_ptr, png_infop info_ptr, 3125 png_uint_32 length)); 3126 PNG_EXTERN void png_handle_IEND PNGARG((png_structp png_ptr, png_infop info_ptr, 3127 png_uint_32 length)); 3128 3129 #ifdef PNG_READ_bKGD_SUPPORTED 3130 PNG_EXTERN void png_handle_bKGD PNGARG((png_structp png_ptr, png_infop info_ptr, 3131 png_uint_32 length)) PNG_PRIVATE; 3132 #endif 3133 3134 #ifdef PNG_READ_cHRM_SUPPORTED 3135 PNG_EXTERN void png_handle_cHRM PNGARG((png_structp png_ptr, png_infop info_ptr, 3136 png_uint_32 length)) PNG_PRIVATE; 3137 #endif 3138 3139 #ifdef PNG_READ_gAMA_SUPPORTED 3140 PNG_EXTERN void png_handle_gAMA PNGARG((png_structp png_ptr, png_infop info_ptr, 3141 png_uint_32 length)) PNG_PRIVATE; 3142 #endif 3143 3144 #ifdef PNG_READ_hIST_SUPPORTED 3145 PNG_EXTERN void png_handle_hIST PNGARG((png_structp png_ptr, png_infop info_ptr, 3146 png_uint_32 length)) PNG_PRIVATE; 3147 #endif 3148 3149 #ifdef PNG_READ_iCCP_SUPPORTED 3150 extern void png_handle_iCCP PNGARG((png_structp png_ptr, png_infop info_ptr, 3151 png_uint_32 length)); 3152 #endif /* PNG_READ_iCCP_SUPPORTED */ 3153 3154 #ifdef PNG_READ_iTXt_SUPPORTED 3155 PNG_EXTERN void png_handle_iTXt PNGARG((png_structp png_ptr, png_infop info_ptr, 3156 png_uint_32 length)) PNG_PRIVATE; 3157 #endif 3158 3159 #ifdef PNG_READ_oFFs_SUPPORTED 3160 PNG_EXTERN void png_handle_oFFs PNGARG((png_structp png_ptr, png_infop info_ptr, 3161 png_uint_32 length)) PNG_PRIVATE; 3162 #endif 3163 3164 #ifdef PNG_READ_pCAL_SUPPORTED 3165 PNG_EXTERN void png_handle_pCAL PNGARG((png_structp png_ptr, png_infop info_ptr, 3166 png_uint_32 length)) PNG_PRIVATE; 3167 #endif 3168 3169 #ifdef PNG_READ_pHYs_SUPPORTED 3170 PNG_EXTERN void png_handle_pHYs PNGARG((png_structp png_ptr, png_infop info_ptr, 3171 png_uint_32 length)) PNG_PRIVATE; 3172 #endif 3173 3174 #ifdef PNG_READ_sBIT_SUPPORTED 3175 PNG_EXTERN void png_handle_sBIT PNGARG((png_structp png_ptr, png_infop info_ptr, 3176 png_uint_32 length)) PNG_PRIVATE; 3177 #endif 3178 3179 #ifdef PNG_READ_sCAL_SUPPORTED 3180 PNG_EXTERN void png_handle_sCAL PNGARG((png_structp png_ptr, png_infop info_ptr, 3181 png_uint_32 length)) PNG_PRIVATE; 3182 #endif 3183 3184 #ifdef PNG_READ_sPLT_SUPPORTED 3185 extern void png_handle_sPLT PNGARG((png_structp png_ptr, png_infop info_ptr, 3186 png_uint_32 length)) PNG_PRIVATE; 3187 #endif /* PNG_READ_sPLT_SUPPORTED */ 3188 3189 #ifdef PNG_READ_sRGB_SUPPORTED 3190 PNG_EXTERN void png_handle_sRGB PNGARG((png_structp png_ptr, png_infop info_ptr, 3191 png_uint_32 length)) PNG_PRIVATE; 3192 #endif 3193 3194 #ifdef PNG_READ_tEXt_SUPPORTED 3195 PNG_EXTERN void png_handle_tEXt PNGARG((png_structp png_ptr, png_infop info_ptr, 3196 png_uint_32 length)) PNG_PRIVATE; 3197 #endif 3198 3199 #ifdef PNG_READ_tIME_SUPPORTED 3200 PNG_EXTERN void png_handle_tIME PNGARG((png_structp png_ptr, png_infop info_ptr, 3201 png_uint_32 length)) PNG_PRIVATE; 3202 #endif 3203 3204 #ifdef PNG_READ_tRNS_SUPPORTED 3205 PNG_EXTERN void png_handle_tRNS PNGARG((png_structp png_ptr, png_infop info_ptr, 3206 png_uint_32 length)) PNG_PRIVATE; 3207 #endif 3208 3209 #ifdef PNG_READ_zTXt_SUPPORTED 3210 PNG_EXTERN void png_handle_zTXt PNGARG((png_structp png_ptr, png_infop info_ptr, 3211 png_uint_32 length)) PNG_PRIVATE; 3212 #endif 3213 3214 PNG_EXTERN void png_handle_unknown PNGARG((png_structp png_ptr, 3215 png_infop info_ptr, png_uint_32 length)) PNG_PRIVATE; 3216 3217 PNG_EXTERN void png_check_chunk_name PNGARG((png_structp png_ptr, 3218 png_bytep chunk_name)) PNG_PRIVATE; 3219 3220 /* Handle the transformations for reading and writing */ 3221 PNG_EXTERN void png_do_read_transformations 3222 PNGARG((png_structp png_ptr)) PNG_PRIVATE; 3223 PNG_EXTERN void png_do_write_transformations 3224 PNGARG((png_structp png_ptr)) PNG_PRIVATE; 3225 3226 PNG_EXTERN void png_init_read_transformations 3227 PNGARG((png_structp png_ptr)) PNG_PRIVATE; 3228 3229 #ifdef PNG_PROGRESSIVE_READ_SUPPORTED 3230 PNG_EXTERN void png_push_read_chunk PNGARG((png_structp png_ptr, 3231 png_infop info_ptr)) PNG_PRIVATE; 3232 PNG_EXTERN void png_push_read_sig PNGARG((png_structp png_ptr, 3233 png_infop info_ptr)) PNG_PRIVATE; 3234 PNG_EXTERN void png_push_check_crc PNGARG((png_structp png_ptr)) PNG_PRIVATE; 3235 PNG_EXTERN void png_push_crc_skip PNGARG((png_structp png_ptr, 3236 png_uint_32 length)) PNG_PRIVATE; 3237 PNG_EXTERN void png_push_crc_finish PNGARG((png_structp png_ptr)) PNG_PRIVATE; 3238 PNG_EXTERN void png_push_save_buffer PNGARG((png_structp png_ptr)) PNG_PRIVATE; 3239 PNG_EXTERN void png_push_restore_buffer PNGARG((png_structp png_ptr, 3240 png_bytep buffer, png_size_t buffer_length)) PNG_PRIVATE; 3241 PNG_EXTERN void png_push_read_IDAT PNGARG((png_structp png_ptr)) PNG_PRIVATE; 3242 PNG_EXTERN void png_process_IDAT_data PNGARG((png_structp png_ptr, 3243 png_bytep buffer, png_size_t buffer_length)) PNG_PRIVATE; 3244 PNG_EXTERN void png_push_process_row PNGARG((png_structp png_ptr)) PNG_PRIVATE; 3245 PNG_EXTERN void png_push_handle_unknown PNGARG((png_structp png_ptr, 3246 png_infop info_ptr, png_uint_32 length)) PNG_PRIVATE; 3247 PNG_EXTERN void png_push_have_info PNGARG((png_structp png_ptr, 3248 png_infop info_ptr)) PNG_PRIVATE; 3249 PNG_EXTERN void png_push_have_end PNGARG((png_structp png_ptr, 3250 png_infop info_ptr)) PNG_PRIVATE; 3251 PNG_EXTERN void png_push_have_row PNGARG((png_structp png_ptr, 3252 png_bytep row)) PNG_PRIVATE; 3253 PNG_EXTERN void png_push_read_end PNGARG((png_structp png_ptr, 3254 png_infop info_ptr)) PNG_PRIVATE; 3255 PNG_EXTERN void png_process_some_data PNGARG((png_structp png_ptr, 3256 png_infop info_ptr)) PNG_PRIVATE; 3257 PNG_EXTERN void png_read_push_finish_row 3258 PNGARG((png_structp png_ptr)) PNG_PRIVATE; 3259 #ifdef PNG_READ_tEXt_SUPPORTED 3260 PNG_EXTERN void png_push_handle_tEXt PNGARG((png_structp png_ptr, 3261 png_infop info_ptr, png_uint_32 length)) PNG_PRIVATE; 3262 PNG_EXTERN void png_push_read_tEXt PNGARG((png_structp png_ptr, 3263 png_infop info_ptr)) PNG_PRIVATE; 3264 #endif 3265 #ifdef PNG_READ_zTXt_SUPPORTED 3266 PNG_EXTERN void png_push_handle_zTXt PNGARG((png_structp png_ptr, 3267 png_infop info_ptr, png_uint_32 length)) PNG_PRIVATE; 3268 PNG_EXTERN void png_push_read_zTXt PNGARG((png_structp png_ptr, 3269 png_infop info_ptr)) PNG_PRIVATE; 3270 #endif 3271 #ifdef PNG_READ_iTXt_SUPPORTED 3272 PNG_EXTERN void png_push_handle_iTXt PNGARG((png_structp png_ptr, 3273 png_infop info_ptr, png_uint_32 length)) PNG_PRIVATE; 3274 PNG_EXTERN void png_push_read_iTXt PNGARG((png_structp png_ptr, 3275 png_infop info_ptr)) PNG_PRIVATE; 3276 #endif 3277 3278 #endif /* PNG_PROGRESSIVE_READ_SUPPORTED */ 3279 3280 #ifdef PNG_MNG_FEATURES_SUPPORTED 3281 PNG_EXTERN void png_do_read_intrapixel PNGARG((png_row_infop row_info, 3282 png_bytep row)) PNG_PRIVATE; 3283 PNG_EXTERN void png_do_write_intrapixel PNGARG((png_row_infop row_info, 3284 png_bytep row)) PNG_PRIVATE; 3285 #endif 3286 3287 3288 /* The following six functions will be exported in libpng-1.4.0. */ 3289 #if defined(PNG_INCH_CONVERSIONS) && defined(PNG_FLOATING_POINT_SUPPORTED) 3290 PNG_EXTERN png_uint_32 png_get_pixels_per_inch PNGARG((png_structp png_ptr, 3291 png_infop info_ptr)); 3292 3293 PNG_EXTERN png_uint_32 png_get_x_pixels_per_inch PNGARG((png_structp png_ptr, 3294 png_infop info_ptr)); 3295 3296 PNG_EXTERN png_uint_32 png_get_y_pixels_per_inch PNGARG((png_structp png_ptr, 3297 png_infop info_ptr)); 3298 3299 PNG_EXTERN float png_get_x_offset_inches PNGARG((png_structp png_ptr, 3300 png_infop info_ptr)); 3301 3302 PNG_EXTERN float png_get_y_offset_inches PNGARG((png_structp png_ptr, 3303 png_infop info_ptr)); 3304 3305 #ifdef PNG_pHYs_SUPPORTED 3306 PNG_EXTERN png_uint_32 png_get_pHYs_dpi PNGARG((png_structp png_ptr, 3307 png_infop info_ptr, png_uint_32 *res_x, png_uint_32 *res_y, int *unit_type)); 3308 #endif /* PNG_pHYs_SUPPORTED */ 3309 #endif /* PNG_INCH_CONVERSIONS && PNG_FLOATING_POINT_SUPPORTED */ 3310 3311 /* Read the chunk header (length + type name) */ 3312 PNG_EXTERN png_uint_32 png_read_chunk_header 3313 PNGARG((png_structp png_ptr)) PNG_PRIVATE; 3314 3315 /* Added at libpng version 1.2.34 */ 3316 #ifdef PNG_cHRM_SUPPORTED 3317 PNG_EXTERN int png_check_cHRM_fixed PNGARG((png_structp png_ptr, 3318 png_fixed_point int_white_x, png_fixed_point int_white_y, 3319 png_fixed_point int_red_x, png_fixed_point int_red_y, png_fixed_point 3320 int_green_x, png_fixed_point int_green_y, png_fixed_point int_blue_x, 3321 png_fixed_point int_blue_y)) PNG_PRIVATE; 3322 #endif 3323 3324 #ifdef PNG_cHRM_SUPPORTED 3325 #ifdef PNG_CHECK_cHRM_SUPPORTED 3326 /* Added at libpng version 1.2.34 */ 3327 PNG_EXTERN void png_64bit_product PNGARG((long v1, long v2, 3328 unsigned long *hi_product, unsigned long *lo_product)) PNG_PRIVATE; 3329 #endif 3330 #endif 3331 3332 /* Added at libpng version 1.2.41 */ 3333 PNG_EXTERN void png_check_IHDR PNGARG((png_structp png_ptr, 3334 png_uint_32 width, png_uint_32 height, int bit_depth, 3335 int color_type, int interlace_type, int compression_type, 3336 int filter_type)) PNG_PRIVATE; 3337 3338 /* Added at libpng version 1.2.41 */ 3339 PNG_EXTERN png_voidp png_calloc PNGARG((png_structp png_ptr, 3340 png_uint_32 size)); 3341 3342 /* Maintainer: Put new private prototypes here ^ and in libpngpf.3 */ 3343 3344 #endif /* PNG_INTERNAL */ 3345 3346 #ifdef __cplusplus 3347 } 3348 #endif 3349 3350 #endif /* PNG_VERSION_INFO_ONLY */ 3351 /* Do not put anything past this line */ 3352 #endif /* PNG_H */ 3353