1 2 /* png.h - header file for PNG reference library 3 * 4 * libpng version 1.2.0 - September 1, 2001 5 * Copyright (c) 1998-2001 Glenn Randers-Pehrson 6 * (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger) 7 * (Version 0.88 Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.) 8 * 9 * Authors and maintainers: 10 * libpng versions 0.71, May 1995, through 0.88, January 1996: Guy Schalnat 11 * libpng versions 0.89c, June 1996, through 0.96, May 1997: Andreas Dilger 12 * libpng versions 0.97, January 1998, through 1.2.0 - September 1, 2001: Glenn 13 * See also "Contributing Authors", below. 14 * 15 * Note about libpng version numbers: 16 * 17 * Due to various miscommunications, unforeseen code incompatibilities 18 * and occasional factors outside the authors' control, version numbering 19 * on the library has not always been consistent and straightforward. 20 * The following table summarizes matters since version 0.89c, which was 21 * the first widely used release: 22 * 23 * source png.h png.h shared-lib 24 * version string int version 25 * ------- ------ ----- ---------- 26 * 0.89c "1.0 beta 3" 0.89 89 1.0.89 27 * 0.90 "1.0 beta 4" 0.90 90 0.90 [should have been 2.0.90] 28 * 0.95 "1.0 beta 5" 0.95 95 0.95 [should have been 2.0.95] 29 * 0.96 "1.0 beta 6" 0.96 96 0.96 [should have been 2.0.96] 30 * 0.97b "1.00.97 beta 7" 1.00.97 97 1.0.1 [should have been 2.0.97] 31 * 0.97c 0.97 97 2.0.97 32 * 0.98 0.98 98 2.0.98 33 * 0.99 0.99 98 2.0.99 34 * 0.99a-m 0.99 99 2.0.99 35 * 1.00 1.00 100 2.1.0 [100 should be 10000] 36 * 1.0.0 (from here on, the 100 2.1.0 [100 should be 10000] 37 * 1.0.1 png.h string is 10001 2.1.0 38 * 1.0.1a-e identical to the 10002 from here on, the shared library 39 * 1.0.2 source version) 10002 is 2.V where V is the source code 40 * 1.0.2a-b 10003 version, except as noted. 41 * 1.0.3 10003 42 * 1.0.3a-d 10004 43 * 1.0.4 10004 44 * 1.0.4a-f 10005 45 * 1.0.5 (+ 2 patches) 10005 46 * 1.0.5a-d 10006 47 * 1.0.5e-r 10100 (not source compatible) 48 * 1.0.5s-v 10006 (not binary compatible) 49 * 1.0.6 (+ 3 patches) 10006 (still binary incompatible) 50 * 1.0.6d-f 10007 (still binary incompatible) 51 * 1.0.6g 10007 52 * 1.0.6h 10007 10.6h (testing xy.z so-numbering) 53 * 1.0.6i 10007 10.6i 54 * 1.0.6j 10007 2.1.0.6j (incompatible with 1.0.0) 55 * 1.0.7beta11-14 DLLNUM 10007 2.1.0.7beta11-14 (binary compatible) 56 * 1.0.7beta15-18 1 10007 2.1.0.7beta15-18 (binary compatible) 57 * 1.0.7rc1-2 1 10007 2.1.0.7rc1-2 (binary compatible) 58 * 1.0.7 1 10007 (still compatible) 59 * 1.0.8beta1-4 1 10008 2.1.0.8beta1-4 60 * 1.0.8rc1 1 10008 2.1.0.8rc1 61 * 1.0.8 1 10008 2.1.0.8 62 * 1.0.9beta1-6 1 10009 2.1.0.9beta1-6 63 * 1.0.9rc1 1 10009 2.1.0.9rc1 64 * 1.0.9beta7-10 1 10009 2.1.0.9beta7-10 65 * 1.0.9rc2 1 10009 2.1.0.9rc2 66 * 1.0.9 1 10009 2.1.0.9 67 * 1.0.10beta1 1 10010 2.1.0.10beta1 68 * 1.0.10rc1 1 10010 2.1.0.10rc1 69 * 1.0.10 1 10010 2.1.0.10 70 * 1.0.11beta1-3 1 10011 2.1.0.11beta1-3 71 * 1.0.11rc1 1 10011 2.1.0.11rc1 72 * 1.0.11 1 10011 2.1.0.11 73 * 1.0.12beta1-2 2 10012 2.1.0.12beta1-2 74 * 1.0.12rc1 2 10012 2.1.0.12rc1 75 * 1.0.12 2 10012 2.1.0.12 76 * 1.1.0a-f - 10100 2.1.1.0a-f (branch abandoned) 77 * 1.2.0beta1-2 2 10200 2.1.2.0beta1-2 78 * 1.2.0beta3-4 3 10200 3.1.2.0beta3-4 79 * 80 * Henceforth the source version will match the shared-library major 81 * and minor numbers; the shared-library major version number will be 82 * used for changes in backward compatibility, as it is intended. The 83 * PNG_LIBPNG_VER macro, which is not used within libpng but is available 84 * for applications, is an unsigned integer of the form xyyzz corresponding 85 * to the source version x.y.z (leading zeros in y and z). Beta versions 86 * were given the previous public release number plus a letter, until 87 * version 1.0.6j; from then on they were given the upcoming public 88 * release number plus "betaNN" or "rcN". 89 * 90 * Binary incompatibility exists only when applications make direct access 91 * to the info_ptr or png_ptr members through png.h, and the compiled 92 * application is loaded with a different version of the library. 93 * 94 * DLLNUM will change each time there are forward or backward changes 95 * in binary compatibility (e.g., when a new feature is added). 96 * 97 * See libpng.txt or libpng.3 for more information. The PNG specification 98 * is available as RFC 2083 <ftp://ftp.uu.net/graphics/png/documents/> 99 * and as a W3C Recommendation <http://www.w3.org/TR/REC.png.html> 100 */ 101 102 /* 103 * COPYRIGHT NOTICE, DISCLAIMER, and LICENSE: 104 * 105 * If you modify libpng you may insert additional notices immediately following 106 * this sentence. 107 * 108 * libpng versions 1.0.7, July 1, 2000, through 1.2.0, September 1, 2001, are 109 * Copyright (c) 2000, 2001 Glenn Randers-Pehrson, and are 110 * distributed according to the same disclaimer and license as libpng-1.0.6 111 * with the following individuals added to the list of Contributing Authors 112 * 113 * Simon-Pierre Cadieux 114 * Eric S. Raymond 115 * Gilles Vollant 116 * 117 * and with the following additions to the disclaimer: 118 * 119 * There is no warranty against interference with your enjoyment of the 120 * library or against infringement. There is no warranty that our 121 * efforts or the library will fulfill any of your particular purposes 122 * or needs. This library is provided with all faults, and the entire 123 * risk of satisfactory quality, performance, accuracy, and effort is with 124 * the user. 125 * 126 * libpng versions 0.97, January 1998, through 1.0.6, March 20, 2000, are 127 * Copyright (c) 1998, 1999, 2000 Glenn Randers-Pehrson 128 * Distributed according to the same disclaimer and license as libpng-0.96, 129 * with the following individuals added to the list of Contributing Authors: 130 * 131 * Tom Lane 132 * Glenn Randers-Pehrson 133 * Willem van Schaik 134 * 135 * libpng versions 0.89, June 1996, through 0.96, May 1997, are 136 * Copyright (c) 1996, 1997 Andreas Dilger 137 * Distributed according to the same disclaimer and license as libpng-0.88, 138 * with the following individuals added to the list of Contributing Authors: 139 * 140 * John Bowler 141 * Kevin Bracey 142 * Sam Bushell 143 * Magnus Holmgren 144 * Greg Roelofs 145 * Tom Tanner 146 * 147 * libpng versions 0.5, May 1995, through 0.88, January 1996, are 148 * Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc. 149 * 150 * For the purposes of this copyright and license, "Contributing Authors" 151 * is defined as the following set of individuals: 152 * 153 * Andreas Dilger 154 * Dave Martindale 155 * Guy Eric Schalnat 156 * Paul Schmidt 157 * Tim Wegner 158 * 159 * The PNG Reference Library is supplied "AS IS". The Contributing Authors 160 * and Group 42, Inc. disclaim all warranties, expressed or implied, 161 * including, without limitation, the warranties of merchantability and of 162 * fitness for any purpose. The Contributing Authors and Group 42, Inc. 163 * assume no liability for direct, indirect, incidental, special, exemplary, 164 * or consequential damages, which may result from the use of the PNG 165 * Reference Library, even if advised of the possibility of such damage. 166 * 167 * Permission is hereby granted to use, copy, modify, and distribute this 168 * source code, or portions hereof, for any purpose, without fee, subject 169 * to the following restrictions: 170 * 171 * 1. The origin of this source code must not be misrepresented. 172 * 173 * 2. Altered versions must be plainly marked as such and 174 * must not be misrepresented as being the original source. 175 * 176 * 3. This Copyright notice may not be removed or altered from 177 * any source or altered source distribution. 178 * 179 * The Contributing Authors and Group 42, Inc. specifically permit, without 180 * fee, and encourage the use of this source code as a component to 181 * supporting the PNG file format in commercial products. If you use this 182 * source code in a product, acknowledgment is not required but would be 183 * appreciated. 184 */ 185 186 /* 187 * A "png_get_copyright" function is available, for convenient use in "about" 188 * boxes and the like: 189 * 190 * printf("%s",png_get_copyright(NULL)); 191 * 192 * Also, the PNG logo (in PNG format, of course) is supplied in the 193 * files "pngbar.png" and "pngbar.jpg (88x31) and "pngnow.png" (98x31). 194 */ 195 196 /* 197 * Libpng is OSI Certified Open Source Software. OSI Certified is a 198 * certification mark of the Open Source Initiative. 199 */ 200 201 /* 202 * The contributing authors would like to thank all those who helped 203 * with testing, bug fixes, and patience. This wouldn't have been 204 * possible without all of you. 205 * 206 * Thanks to Frank J. T. Wojcik for helping with the documentation. 207 */ 208 209 /* 210 * Y2K compliance in libpng: 211 * ========================= 212 * 213 * September 1, 2001 214 * 215 * Since the PNG Development group is an ad-hoc body, we can't make 216 * an official declaration. 217 * 218 * This is your unofficial assurance that libpng from version 0.71 and 219 * upward through 1.2.0 are Y2K compliant. It is my belief that earlier 220 * versions were also Y2K compliant. 221 * 222 * Libpng only has three year fields. One is a 2-byte unsigned integer 223 * that will hold years up to 65535. The other two hold the date in text 224 * format, and will hold years up to 9999. 225 * 226 * The integer is 227 * "png_uint_16 year" in png_time_struct. 228 * 229 * The strings are 230 * "png_charp time_buffer" in png_struct and 231 * "near_time_buffer", which is a local character string in png.c. 232 * 233 * There are seven time-related functions: 234 * png.c: png_convert_to_rfc_1123() in png.c 235 * (formerly png_convert_to_rfc_1152() in error) 236 * png_convert_from_struct_tm() in pngwrite.c, called in pngwrite.c 237 * png_convert_from_time_t() in pngwrite.c 238 * png_get_tIME() in pngget.c 239 * png_handle_tIME() in pngrutil.c, called in pngread.c 240 * png_set_tIME() in pngset.c 241 * png_write_tIME() in pngwutil.c, called in pngwrite.c 242 * 243 * All handle dates properly in a Y2K environment. The 244 * png_convert_from_time_t() function calls gmtime() to convert from system 245 * clock time, which returns (year - 1900), which we properly convert to 246 * the full 4-digit year. There is a possibility that applications using 247 * libpng are not passing 4-digit years into the png_convert_to_rfc_1123() 248 * function, or that they are incorrectly passing only a 2-digit year 249 * instead of "year - 1900" into the png_convert_from_struct_tm() function, 250 * but this is not under our control. The libpng documentation has always 251 * stated that it works with 4-digit years, and the APIs have been 252 * documented as such. 253 * 254 * The tIME chunk itself is also Y2K compliant. It uses a 2-byte unsigned 255 * integer to hold the year, and can hold years as large as 65535. 256 * 257 * zlib, upon which libpng depends, is also Y2K compliant. It contains 258 * no date-related code. 259 * 260 * Glenn Randers-Pehrson 261 * libpng maintainer 262 * PNG Development Group 263 */ 264 265 #ifndef PNG_H 266 #define PNG_H 267 268 /* This is not the place to learn how to use libpng. The file libpng.txt 269 * describes how to use libpng, and the file example.c summarizes it 270 * with some code on which to build. This file is useful for looking 271 * at the actual function definitions and structure components. 272 */ 273 274 /* Version information for png.h - this should match the version in png.c */ 275 #define PNG_LIBPNG_VER_STRING "1.2.0" 276 277 #define PNG_LIBPNG_VER_SONUM 3 278 #define PNG_LIBPNG_VER_DLLNUM %DLLNUM% 279 280 /* These should match the first 3 components of PNG_LIBPNG_VER_STRING: */ 281 #define PNG_LIBPNG_VER_MAJOR 1 282 #define PNG_LIBPNG_VER_MINOR 2 283 #define PNG_LIBPNG_VER_RELEASE 0 284 /* This should match the numeric part of the final component of 285 * PNG_LIBPNG_VER_STRING, omitting any leading zero: */ 286 287 #define PNG_LIBPNG_VER_BUILD 0 288 289 #define PNG_LIBPNG_BUILD_ALPHA 1 290 #define PNG_LIBPNG_BUILD_BETA 2 291 #define PNG_LIBPNG_BUILD_RC 3 292 #define PNG_LIBPNG_BUILD_STABLE 4 293 #define PNG_LIBPNG_BUILD_TYPEMASK 7 294 #define PNG_LIBPNG_BUILD_PATCH 8 /* Can be OR'ed with STABLE only */ 295 #define PNG_LIBPNG_BUILD_TYPE 4 296 297 /* Careful here. At one time, Guy wanted to use 082, but that would be octal. 298 * We must not include leading zeros. 299 * Versions 0.7 through 1.0.0 were in the range 0 to 100 here (only 300 * version 1.0.0 was mis-numbered 100 instead of 10000). From 301 * version 1.0.1 it's xxyyzz, where x=major, y=minor, z=release */ 302 #define PNG_LIBPNG_VER 10200 /* 1.2.0 */ 303 304 #ifndef PNG_VERSION_INFO_ONLY 305 306 /* include the compression library's header */ 307 #include "zlib.h" 308 309 /* include all user configurable info, including optional assembler routines */ 310 #include "pngconf.h" 311 312 /* Inhibit C++ name-mangling for libpng functions but not for system calls. */ 313 #ifdef __cplusplus 314 extern "C" { 315 #endif /* __cplusplus */ 316 317 /* This file is arranged in several sections. The first section contains 318 * structure and type definitions. The second section contains the external 319 * library functions, while the third has the internal library functions, 320 * which applications aren't expected to use directly. 321 */ 322 323 /* variables declared in png.c - only it needs to define PNG_NO_EXTERN */ 324 #if !defined(PNG_NO_EXTERN) || defined(PNG_ALWAYS_EXTERN) 325 /* Version information for C files, stored in png.c. This had better match 326 * the version above. 327 */ 328 #ifdef PNG_USE_GLOBAL_ARRAYS 329 PNG_EXPORT_VAR (const char) png_libpng_ver[18]; 330 /* need room for 99.99.99beta99z*/ 331 #else 332 #define png_libpng_ver png_get_header_ver(NULL) 333 #endif 334 335 #ifdef PNG_USE_GLOBAL_ARRAYS 336 /* This was removed in version 1.0.5c */ 337 /* Structures to facilitate easy interlacing. See png.c for more details */ 338 PNG_EXPORT_VAR (const int FARDATA) png_pass_start[7]; 339 PNG_EXPORT_VAR (const int FARDATA) png_pass_inc[7]; 340 PNG_EXPORT_VAR (const int FARDATA) png_pass_ystart[7]; 341 PNG_EXPORT_VAR (const int FARDATA) png_pass_yinc[7]; 342 PNG_EXPORT_VAR (const int FARDATA) png_pass_mask[7]; 343 PNG_EXPORT_VAR (const int FARDATA) png_pass_dsp_mask[7]; 344 #ifdef PNG_HAVE_ASSEMBLER_COMBINE_ROW 345 PNG_EXPORT_VAR (const int FARDATA) png_pass_width[7]; 346 #endif 347 /* This isn't currently used. If you need it, see png.c for more details. 348 PNG_EXPORT_VAR (const int FARDATA) png_pass_height[7]; 349 */ 350 #endif 351 352 #endif /* PNG_NO_EXTERN */ 353 354 /* Three color definitions. The order of the red, green, and blue, (and the 355 * exact size) is not important, although the size of the fields need to 356 * be png_byte or png_uint_16 (as defined below). 357 */ 358 typedef struct png_color_struct 359 { 360 png_byte red; 361 png_byte green; 362 png_byte blue; 363 } png_color; 364 typedef png_color FAR * png_colorp; 365 typedef png_color FAR * FAR * png_colorpp; 366 367 typedef struct png_color_16_struct 368 { 369 png_byte index; /* used for palette files */ 370 png_uint_16 red; /* for use in red green blue files */ 371 png_uint_16 green; 372 png_uint_16 blue; 373 png_uint_16 gray; /* for use in grayscale files */ 374 } png_color_16; 375 typedef png_color_16 FAR * png_color_16p; 376 typedef png_color_16 FAR * FAR * png_color_16pp; 377 378 typedef struct png_color_8_struct 379 { 380 png_byte red; /* for use in red green blue files */ 381 png_byte green; 382 png_byte blue; 383 png_byte gray; /* for use in grayscale files */ 384 png_byte alpha; /* for alpha channel files */ 385 } png_color_8; 386 typedef png_color_8 FAR * png_color_8p; 387 typedef png_color_8 FAR * FAR * png_color_8pp; 388 389 /* 390 * The following two structures are used for the in-core representation 391 * of sPLT chunks. 392 */ 393 typedef struct png_sPLT_entry_struct 394 { 395 png_uint_16 red; 396 png_uint_16 green; 397 png_uint_16 blue; 398 png_uint_16 alpha; 399 png_uint_16 frequency; 400 } png_sPLT_entry; 401 typedef png_sPLT_entry FAR * png_sPLT_entryp; 402 typedef png_sPLT_entry FAR * FAR * png_sPLT_entrypp; 403 404 /* When the depth of the sPLT palette is 8 bits, the color and alpha samples 405 * occupy the LSB of their respective members, and the MSB of each member 406 * is zero-filled. The frequency member always occupies the full 16 bits. 407 */ 408 409 typedef struct png_sPLT_struct 410 { 411 png_charp name; /* palette name */ 412 png_byte depth; /* depth of palette samples */ 413 png_sPLT_entryp entries; /* palette entries */ 414 png_int_32 nentries; /* number of palette entries */ 415 } png_sPLT_t; 416 typedef png_sPLT_t FAR * png_sPLT_tp; 417 typedef png_sPLT_t FAR * FAR * png_sPLT_tpp; 418 419 #ifdef PNG_TEXT_SUPPORTED 420 /* png_text holds the contents of a text/ztxt/itxt chunk in a PNG file, 421 * and whether that contents is compressed or not. The "key" field 422 * points to a regular zero-terminated C string. The "text", "lang", and 423 * "lang_key" fields can be regular C strings, empty strings, or NULL pointers. 424 * However, the * structure returned by png_get_text() will always contain 425 * regular zero-terminated C strings (possibly empty), never NULL pointers, 426 * so they can be safely used in printf() and other string-handling functions. 427 */ 428 typedef struct png_text_struct 429 { 430 int compression; /* compression value: 431 -1: tEXt, none 432 0: zTXt, deflate 433 1: iTXt, none 434 2: iTXt, deflate */ 435 png_charp key; /* keyword, 1-79 character description of "text" */ 436 png_charp text; /* comment, may be an empty string (ie "") 437 or a NULL pointer */ 438 png_size_t text_length; /* length of the text string */ 439 #ifdef PNG_iTXt_SUPPORTED 440 png_size_t itxt_length; /* length of the itxt string */ 441 png_charp lang; /* language code, 0-79 characters 442 or a NULL pointer */ 443 png_charp lang_key; /* keyword translated UTF-8 string, 0 or more 444 chars or a NULL pointer */ 445 #endif 446 } png_text; 447 typedef png_text FAR * png_textp; 448 typedef png_text FAR * FAR * png_textpp; 449 #endif 450 451 /* Supported compression types for text in PNG files (tEXt, and zTXt). 452 * The values of the PNG_TEXT_COMPRESSION_ defines should NOT be changed. */ 453 #define PNG_TEXT_COMPRESSION_NONE_WR -3 454 #define PNG_TEXT_COMPRESSION_zTXt_WR -2 455 #define PNG_TEXT_COMPRESSION_NONE -1 456 #define PNG_TEXT_COMPRESSION_zTXt 0 457 #define PNG_ITXT_COMPRESSION_NONE 1 458 #define PNG_ITXT_COMPRESSION_zTXt 2 459 #define PNG_TEXT_COMPRESSION_LAST 3 /* Not a valid value */ 460 461 /* png_time is a way to hold the time in an machine independent way. 462 * Two conversions are provided, both from time_t and struct tm. There 463 * is no portable way to convert to either of these structures, as far 464 * as I know. If you know of a portable way, send it to me. As a side 465 * note - PNG has always been Year 2000 compliant! 466 */ 467 typedef struct png_time_struct 468 { 469 png_uint_16 year; /* full year, as in, 1995 */ 470 png_byte month; /* month of year, 1 - 12 */ 471 png_byte day; /* day of month, 1 - 31 */ 472 png_byte hour; /* hour of day, 0 - 23 */ 473 png_byte minute; /* minute of hour, 0 - 59 */ 474 png_byte second; /* second of minute, 0 - 60 (for leap seconds) */ 475 } png_time; 476 typedef png_time FAR * png_timep; 477 typedef png_time FAR * FAR * png_timepp; 478 479 #if defined(PNG_UNKNOWN_CHUNKS_SUPPORTED) 480 /* png_unknown_chunk is a structure to hold queued chunks for which there is 481 * no specific support. The idea is that we can use this to queue 482 * up private chunks for output even though the library doesn't actually 483 * know about their semantics. 484 */ 485 typedef struct png_unknown_chunk_t 486 { 487 png_byte name[5]; 488 png_byte *data; 489 png_size_t size; 490 491 /* libpng-using applications should NOT directly modify this byte. */ 492 png_byte location; /* mode of operation at read time */ 493 } 494 png_unknown_chunk; 495 typedef png_unknown_chunk FAR * png_unknown_chunkp; 496 typedef png_unknown_chunk FAR * FAR * png_unknown_chunkpp; 497 #endif 498 499 /* png_info is a structure that holds the information in a PNG file so 500 * that the application can find out the characteristics of the image. 501 * If you are reading the file, this structure will tell you what is 502 * in the PNG file. If you are writing the file, fill in the information 503 * you want to put into the PNG file, then call png_write_info(). 504 * The names chosen should be very close to the PNG specification, so 505 * consult that document for information about the meaning of each field. 506 * 507 * With libpng < 0.95, it was only possible to directly set and read the 508 * the values in the png_info_struct, which meant that the contents and 509 * order of the values had to remain fixed. With libpng 0.95 and later, 510 * however, there are now functions that abstract the contents of 511 * png_info_struct from the application, so this makes it easier to use 512 * libpng with dynamic libraries, and even makes it possible to use 513 * libraries that don't have all of the libpng ancillary chunk-handing 514 * functionality. 515 * 516 * In any case, the order of the parameters in png_info_struct should NOT 517 * be changed for as long as possible to keep compatibility with applications 518 * that use the old direct-access method with png_info_struct. 519 * 520 * The following members may have allocated storage attached that should be 521 * cleaned up before the structure is discarded: palette, trans, text, 522 * pcal_purpose, pcal_units, pcal_params, hist, iccp_name, iccp_profile, 523 * splt_palettes, scal_unit, row_pointers, and unknowns. By default, these 524 * are automatically freed when the info structure is deallocated, if they were 525 * allocated internally by libpng. This behavior can be changed by means 526 * of the png_data_freer() function. 527 * 528 * More allocation details: all the chunk-reading functions that 529 * change these members go through the corresponding png_set_* 530 * functions. A function to clear these members is available: see 531 * png_free_data(). The png_set_* functions do not depend on being 532 * able to point info structure members to any of the storage they are 533 * passed (they make their own copies), EXCEPT that the png_set_text 534 * functions use the same storage passed to them in the text_ptr or 535 * itxt_ptr structure argument, and the png_set_rows and png_set_unknowns 536 * functions do not make their own copies. 537 */ 538 typedef struct png_info_struct 539 { 540 /* the following are necessary for every PNG file */ 541 png_uint_32 width; /* width of image in pixels (from IHDR) */ 542 png_uint_32 height; /* height of image in pixels (from IHDR) */ 543 png_uint_32 valid; /* valid chunk data (see PNG_INFO_ below) */ 544 png_uint_32 rowbytes; /* bytes needed to hold an untransformed row */ 545 png_colorp palette; /* array of color values (valid & PNG_INFO_PLTE) */ 546 png_uint_16 num_palette; /* number of color entries in "palette" (PLTE) */ 547 png_uint_16 num_trans; /* number of transparent palette color (tRNS) */ 548 png_byte bit_depth; /* 1, 2, 4, 8, or 16 bits/channel (from IHDR) */ 549 png_byte color_type; /* see PNG_COLOR_TYPE_ below (from IHDR) */ 550 /* The following three should have been named *_method not *_type */ 551 png_byte compression_type; /* must be PNG_COMPRESSION_TYPE_BASE (IHDR) */ 552 png_byte filter_type; /* must be PNG_FILTER_TYPE_BASE (from IHDR) */ 553 png_byte interlace_type; /* One of PNG_INTERLACE_NONE, PNG_INTERLACE_ADAM7 */ 554 555 /* The following is informational only on read, and not used on writes. */ 556 png_byte channels; /* number of data channels per pixel (1, 2, 3, 4)*/ 557 png_byte pixel_depth; /* number of bits per pixel */ 558 png_byte spare_byte; /* to align the data, and for future use */ 559 png_byte signature[8]; /* magic bytes read by libpng from start of file */ 560 561 /* The rest of the data is optional. If you are reading, check the 562 * valid field to see if the information in these are valid. If you 563 * are writing, set the valid field to those chunks you want written, 564 * and initialize the appropriate fields below. 565 */ 566 567 #if defined(PNG_gAMA_SUPPORTED) && defined(PNG_FLOATING_POINT_SUPPORTED) 568 /* The gAMA chunk describes the gamma characteristics of the system 569 * on which the image was created, normally in the range [1.0, 2.5]. 570 * Data is valid if (valid & PNG_INFO_gAMA) is non-zero. 571 */ 572 float gamma; /* gamma value of image, if (valid & PNG_INFO_gAMA) */ 573 #endif 574 575 #if defined(PNG_sRGB_SUPPORTED) 576 /* GR-P, 0.96a */ 577 /* Data valid if (valid & PNG_INFO_sRGB) non-zero. */ 578 png_byte srgb_intent; /* sRGB rendering intent [0, 1, 2, or 3] */ 579 #endif 580 581 #if defined(PNG_TEXT_SUPPORTED) 582 /* The tEXt, and zTXt chunks contain human-readable textual data in 583 * uncompressed, compressed, and optionally compressed forms, respectively. 584 * The data in "text" is an array of pointers to uncompressed, 585 * null-terminated C strings. Each chunk has a keyword that describes the 586 * textual data contained in that chunk. Keywords are not required to be 587 * unique, and the text string may be empty. Any number of text chunks may 588 * be in an image. 589 */ 590 int num_text; /* number of comments read/to write */ 591 int max_text; /* current size of text array */ 592 png_textp text; /* array of comments read/to write */ 593 #endif /* PNG_TEXT_SUPPORTED */ 594 595 #if defined(PNG_tIME_SUPPORTED) 596 /* The tIME chunk holds the last time the displayed image data was 597 * modified. See the png_time struct for the contents of this struct. 598 */ 599 png_time mod_time; 600 #endif 601 602 #if defined(PNG_sBIT_SUPPORTED) 603 /* The sBIT chunk specifies the number of significant high-order bits 604 * in the pixel data. Values are in the range [1, bit_depth], and are 605 * only specified for the channels in the pixel data. The contents of 606 * the low-order bits is not specified. Data is valid if 607 * (valid & PNG_INFO_sBIT) is non-zero. 608 */ 609 png_color_8 sig_bit; /* significant bits in color channels */ 610 #endif 611 612 #if defined(PNG_tRNS_SUPPORTED) || defined(PNG_READ_EXPAND_SUPPORTED) || \ 613 defined(PNG_READ_BACKGROUND_SUPPORTED) 614 /* The tRNS chunk supplies transparency data for paletted images and 615 * other image types that don't need a full alpha channel. There are 616 * "num_trans" transparency values for a paletted image, stored in the 617 * same order as the palette colors, starting from index 0. Values 618 * for the data are in the range [0, 255], ranging from fully transparent 619 * to fully opaque, respectively. For non-paletted images, there is a 620 * single color specified that should be treated as fully transparent. 621 * Data is valid if (valid & PNG_INFO_tRNS) is non-zero. 622 */ 623 png_bytep trans; /* transparent values for paletted image */ 624 png_color_16 trans_values; /* transparent color for non-palette image */ 625 #endif 626 627 #if defined(PNG_bKGD_SUPPORTED) || defined(PNG_READ_BACKGROUND_SUPPORTED) 628 /* The bKGD chunk gives the suggested image background color if the 629 * display program does not have its own background color and the image 630 * is needs to composited onto a background before display. The colors 631 * in "background" are normally in the same color space/depth as the 632 * pixel data. Data is valid if (valid & PNG_INFO_bKGD) is non-zero. 633 */ 634 png_color_16 background; 635 #endif 636 637 #if defined(PNG_oFFs_SUPPORTED) 638 /* The oFFs chunk gives the offset in "offset_unit_type" units rightwards 639 * and downwards from the top-left corner of the display, page, or other 640 * application-specific co-ordinate space. See the PNG_OFFSET_ defines 641 * below for the unit types. Valid if (valid & PNG_INFO_oFFs) non-zero. 642 */ 643 png_int_32 x_offset; /* x offset on page */ 644 png_int_32 y_offset; /* y offset on page */ 645 png_byte offset_unit_type; /* offset units type */ 646 #endif 647 648 #if defined(PNG_pHYs_SUPPORTED) 649 /* The pHYs chunk gives the physical pixel density of the image for 650 * display or printing in "phys_unit_type" units (see PNG_RESOLUTION_ 651 * defines below). Data is valid if (valid & PNG_INFO_pHYs) is non-zero. 652 */ 653 png_uint_32 x_pixels_per_unit; /* horizontal pixel density */ 654 png_uint_32 y_pixels_per_unit; /* vertical pixel density */ 655 png_byte phys_unit_type; /* resolution type (see PNG_RESOLUTION_ below) */ 656 #endif 657 658 #if defined(PNG_hIST_SUPPORTED) 659 /* The hIST chunk contains the relative frequency or importance of the 660 * various palette entries, so that a viewer can intelligently select a 661 * reduced-color palette, if required. Data is an array of "num_palette" 662 * values in the range [0,65535]. Data valid if (valid & PNG_INFO_hIST) 663 * is non-zero. 664 */ 665 png_uint_16p hist; 666 #endif 667 668 #ifdef PNG_cHRM_SUPPORTED 669 /* The cHRM chunk describes the CIE color characteristics of the monitor 670 * on which the PNG was created. This data allows the viewer to do gamut 671 * mapping of the input image to ensure that the viewer sees the same 672 * colors in the image as the creator. Values are in the range 673 * [0.0, 0.8]. Data valid if (valid & PNG_INFO_cHRM) non-zero. 674 */ 675 #ifdef PNG_FLOATING_POINT_SUPPORTED 676 float x_white; 677 float y_white; 678 float x_red; 679 float y_red; 680 float x_green; 681 float y_green; 682 float x_blue; 683 float y_blue; 684 #endif 685 #endif 686 687 #if defined(PNG_pCAL_SUPPORTED) 688 /* The pCAL chunk describes a transformation between the stored pixel 689 * values and original physical data values used to create the image. 690 * The integer range [0, 2^bit_depth - 1] maps to the floating-point 691 * range given by [pcal_X0, pcal_X1], and are further transformed by a 692 * (possibly non-linear) transformation function given by "pcal_type" 693 * and "pcal_params" into "pcal_units". Please see the PNG_EQUATION_ 694 * defines below, and the PNG-Group's PNG extensions document for a 695 * complete description of the transformations and how they should be 696 * implemented, and for a description of the ASCII parameter strings. 697 * Data values are valid if (valid & PNG_INFO_pCAL) non-zero. 698 */ 699 png_charp pcal_purpose; /* pCAL chunk description string */ 700 png_int_32 pcal_X0; /* minimum value */ 701 png_int_32 pcal_X1; /* maximum value */ 702 png_charp pcal_units; /* Latin-1 string giving physical units */ 703 png_charpp pcal_params; /* ASCII strings containing parameter values */ 704 png_byte pcal_type; /* equation type (see PNG_EQUATION_ below) */ 705 png_byte pcal_nparams; /* number of parameters given in pcal_params */ 706 #endif 707 708 /* New members added in libpng-1.0.6 */ 709 #ifdef PNG_FREE_ME_SUPPORTED 710 png_uint_32 free_me; /* flags items libpng is responsible for freeing */ 711 #endif 712 713 #if defined(PNG_UNKNOWN_CHUNKS_SUPPORTED) 714 /* storage for unknown chunks that the library doesn't recognize. */ 715 png_unknown_chunkp unknown_chunks; 716 png_size_t unknown_chunks_num; 717 #endif 718 719 #if defined(PNG_iCCP_SUPPORTED) 720 /* iCCP chunk data. */ 721 png_charp iccp_name; /* profile name */ 722 png_charp iccp_profile; /* International Color Consortium profile data */ 723 /* Note to maintainer: should be png_bytep */ 724 png_uint_32 iccp_proflen; /* ICC profile data length */ 725 png_byte iccp_compression; /* Always zero */ 726 #endif 727 728 #if defined(PNG_sPLT_SUPPORTED) 729 /* data on sPLT chunks (there may be more than one). */ 730 png_sPLT_tp splt_palettes; 731 png_uint_32 splt_palettes_num; 732 #endif 733 734 #if defined(PNG_sCAL_SUPPORTED) 735 /* The sCAL chunk describes the actual physical dimensions of the 736 * subject matter of the graphic. The chunk contains a unit specification 737 * a byte value, and two ASCII strings representing floating-point 738 * values. The values are width and height corresponsing to one pixel 739 * in the image. This external representation is converted to double 740 * here. Data values are valid if (valid & PNG_INFO_sCAL) is non-zero. 741 */ 742 png_byte scal_unit; /* unit of physical scale */ 743 #ifdef PNG_FLOATING_POINT_SUPPORTED 744 double scal_pixel_width; /* width of one pixel */ 745 double scal_pixel_height; /* height of one pixel */ 746 #endif 747 #ifdef PNG_FIXED_POINT_SUPPORTED 748 png_charp scal_s_width; /* string containing height */ 749 png_charp scal_s_height; /* string containing width */ 750 #endif 751 #endif 752 753 #if defined(PNG_INFO_IMAGE_SUPPORTED) 754 /* Memory has been allocated if (valid & PNG_ALLOCATED_INFO_ROWS) non-zero */ 755 /* Data valid if (valid & PNG_INFO_IDAT) non-zero */ 756 png_bytepp row_pointers; /* the image bits */ 757 #endif 758 759 #if defined(PNG_FIXED_POINT_SUPPORTED) && defined(PNG_gAMA_SUPPORTED) 760 png_fixed_point int_gamma; /* gamma of image, if (valid & PNG_INFO_gAMA) */ 761 #endif 762 763 #if defined(PNG_cHRM_SUPPORTED) && defined(PNG_FIXED_POINT_SUPPORTED) 764 png_fixed_point int_x_white; 765 png_fixed_point int_y_white; 766 png_fixed_point int_x_red; 767 png_fixed_point int_y_red; 768 png_fixed_point int_x_green; 769 png_fixed_point int_y_green; 770 png_fixed_point int_x_blue; 771 png_fixed_point int_y_blue; 772 #endif 773 774 } png_info; 775 776 typedef png_info FAR * png_infop; 777 typedef png_info FAR * FAR * png_infopp; 778 779 /* Maximum positive integer used in PNG is (2^31)-1 */ 780 #define PNG_MAX_UINT ((png_uint_32)0x7fffffffL) 781 782 /* These describe the color_type field in png_info. */ 783 /* color type masks */ 784 #define PNG_COLOR_MASK_PALETTE 1 785 #define PNG_COLOR_MASK_COLOR 2 786 #define PNG_COLOR_MASK_ALPHA 4 787 788 /* color types. Note that not all combinations are legal */ 789 #define PNG_COLOR_TYPE_GRAY 0 790 #define PNG_COLOR_TYPE_PALETTE (PNG_COLOR_MASK_COLOR | PNG_COLOR_MASK_PALETTE) 791 #define PNG_COLOR_TYPE_RGB (PNG_COLOR_MASK_COLOR) 792 #define PNG_COLOR_TYPE_RGB_ALPHA (PNG_COLOR_MASK_COLOR | PNG_COLOR_MASK_ALPHA) 793 #define PNG_COLOR_TYPE_GRAY_ALPHA (PNG_COLOR_MASK_ALPHA) 794 /* aliases */ 795 #define PNG_COLOR_TYPE_RGBA PNG_COLOR_TYPE_RGB_ALPHA 796 #define PNG_COLOR_TYPE_GA PNG_COLOR_TYPE_GRAY_ALPHA 797 798 /* This is for compression type. PNG 1.0-1.2 only define the single type. */ 799 #define PNG_COMPRESSION_TYPE_BASE 0 /* Deflate method 8, 32K window */ 800 #define PNG_COMPRESSION_TYPE_DEFAULT PNG_COMPRESSION_TYPE_BASE 801 802 /* This is for filter type. PNG 1.0-1.2 only define the single type. */ 803 #define PNG_FILTER_TYPE_BASE 0 /* Single row per-byte filtering */ 804 #define PNG_INTRAPIXEL_DIFFERENCING 64 /* Used only in MNG datastreams */ 805 #define PNG_FILTER_TYPE_DEFAULT PNG_FILTER_TYPE_BASE 806 807 /* These are for the interlacing type. These values should NOT be changed. */ 808 #define PNG_INTERLACE_NONE 0 /* Non-interlaced image */ 809 #define PNG_INTERLACE_ADAM7 1 /* Adam7 interlacing */ 810 #define PNG_INTERLACE_LAST 2 /* Not a valid value */ 811 812 /* These are for the oFFs chunk. These values should NOT be changed. */ 813 #define PNG_OFFSET_PIXEL 0 /* Offset in pixels */ 814 #define PNG_OFFSET_MICROMETER 1 /* Offset in micrometers (1/10^6 meter) */ 815 #define PNG_OFFSET_LAST 2 /* Not a valid value */ 816 817 /* These are for the pCAL chunk. These values should NOT be changed. */ 818 #define PNG_EQUATION_LINEAR 0 /* Linear transformation */ 819 #define PNG_EQUATION_BASE_E 1 /* Exponential base e transform */ 820 #define PNG_EQUATION_ARBITRARY 2 /* Arbitrary base exponential transform */ 821 #define PNG_EQUATION_HYPERBOLIC 3 /* Hyperbolic sine transformation */ 822 #define PNG_EQUATION_LAST 4 /* Not a valid value */ 823 824 /* These are for the sCAL chunk. These values should NOT be changed. */ 825 #define PNG_SCALE_UNKNOWN 0 /* unknown unit (image scale) */ 826 #define PNG_SCALE_METER 1 /* meters per pixel */ 827 #define PNG_SCALE_RADIAN 2 /* radians per pixel */ 828 #define PNG_SCALE_LAST 3 /* Not a valid value */ 829 830 /* These are for the pHYs chunk. These values should NOT be changed. */ 831 #define PNG_RESOLUTION_UNKNOWN 0 /* pixels/unknown unit (aspect ratio) */ 832 #define PNG_RESOLUTION_METER 1 /* pixels/meter */ 833 #define PNG_RESOLUTION_LAST 2 /* Not a valid value */ 834 835 /* These are for the sRGB chunk. These values should NOT be changed. */ 836 #define PNG_sRGB_INTENT_PERCEPTUAL 0 837 #define PNG_sRGB_INTENT_RELATIVE 1 838 #define PNG_sRGB_INTENT_SATURATION 2 839 #define PNG_sRGB_INTENT_ABSOLUTE 3 840 #define PNG_sRGB_INTENT_LAST 4 /* Not a valid value */ 841 842 /* This is for text chunks */ 843 #define PNG_KEYWORD_MAX_LENGTH 79 844 845 /* Maximum number of entries in PLTE/sPLT/tRNS arrays */ 846 #define PNG_MAX_PALETTE_LENGTH 256 847 848 /* These determine if an ancillary chunk's data has been successfully read 849 * from the PNG header, or if the application has filled in the corresponding 850 * data in the info_struct to be written into the output file. The values 851 * of the PNG_INFO_<chunk> defines should NOT be changed. 852 */ 853 #define PNG_INFO_gAMA 0x0001 854 #define PNG_INFO_sBIT 0x0002 855 #define PNG_INFO_cHRM 0x0004 856 #define PNG_INFO_PLTE 0x0008 857 #define PNG_INFO_tRNS 0x0010 858 #define PNG_INFO_bKGD 0x0020 859 #define PNG_INFO_hIST 0x0040 860 #define PNG_INFO_pHYs 0x0080 861 #define PNG_INFO_oFFs 0x0100 862 #define PNG_INFO_tIME 0x0200 863 #define PNG_INFO_pCAL 0x0400 864 #define PNG_INFO_sRGB 0x0800 /* GR-P, 0.96a */ 865 #define PNG_INFO_iCCP 0x1000 /* ESR, 1.0.6 */ 866 #define PNG_INFO_sPLT 0x2000 /* ESR, 1.0.6 */ 867 #define PNG_INFO_sCAL 0x4000 /* ESR, 1.0.6 */ 868 #define PNG_INFO_IDAT 0x8000L /* ESR, 1.0.6 */ 869 870 /* This is used for the transformation routines, as some of them 871 * change these values for the row. It also should enable using 872 * the routines for other purposes. 873 */ 874 typedef struct png_row_info_struct 875 { 876 png_uint_32 width; /* width of row */ 877 png_uint_32 rowbytes; /* number of bytes in row */ 878 png_byte color_type; /* color type of row */ 879 png_byte bit_depth; /* bit depth of row */ 880 png_byte channels; /* number of channels (1, 2, 3, or 4) */ 881 png_byte pixel_depth; /* bits per pixel (depth * channels) */ 882 } png_row_info; 883 884 typedef png_row_info FAR * png_row_infop; 885 typedef png_row_info FAR * FAR * png_row_infopp; 886 887 /* These are the function types for the I/O functions and for the functions 888 * that allow the user to override the default I/O functions with his or her 889 * own. The png_error_ptr type should match that of user-supplied warning 890 * and error functions, while the png_rw_ptr type should match that of the 891 * user read/write data functions. 892 */ 893 typedef struct png_struct_def png_struct; 894 typedef png_struct FAR * png_structp; 895 896 typedef void (PNGAPI *png_error_ptr) PNGARG((png_structp, png_const_charp)); 897 typedef void (PNGAPI *png_rw_ptr) PNGARG((png_structp, png_bytep, png_size_t)); 898 typedef void (PNGAPI *png_flush_ptr) PNGARG((png_structp)); 899 typedef void (PNGAPI *png_read_status_ptr) PNGARG((png_structp, png_uint_32, 900 int)); 901 typedef void (PNGAPI *png_write_status_ptr) PNGARG((png_structp, png_uint_32, 902 int)); 903 904 #ifdef PNG_PROGRESSIVE_READ_SUPPORTED 905 typedef void (PNGAPI *png_progressive_info_ptr) PNGARG((png_structp, png_infop)); 906 typedef void (PNGAPI *png_progressive_end_ptr) PNGARG((png_structp, png_infop)); 907 typedef void (PNGAPI *png_progressive_row_ptr) PNGARG((png_structp, png_bytep, 908 png_uint_32, int)); 909 #endif 910 911 #if defined(PNG_READ_USER_TRANSFORM_SUPPORTED) || \ 912 defined(PNG_WRITE_USER_TRANSFORM_SUPPORTED) || \ 913 defined(PNG_LEGACY_SUPPORTED) 914 typedef void (PNGAPI *png_user_transform_ptr) PNGARG((png_structp, 915 png_row_infop, png_bytep)); 916 #endif 917 918 #if defined(PNG_USER_CHUNKS_SUPPORTED) 919 typedef int (PNGAPI *png_user_chunk_ptr) PNGARG((png_structp, png_unknown_chunkp)); 920 #endif 921 #if defined(PNG_UNKNOWN_CHUNKS_SUPPORTED) 922 typedef void (PNGAPI *png_unknown_chunk_ptr) PNGARG((png_structp)); 923 #endif 924 925 /* Transform masks for the high-level interface */ 926 #define PNG_TRANSFORM_IDENTITY 0x0000 /* read and write */ 927 #define PNG_TRANSFORM_STRIP_16 0x0001 /* read only */ 928 #define PNG_TRANSFORM_STRIP_ALPHA 0x0002 /* read only */ 929 #define PNG_TRANSFORM_PACKING 0x0004 /* read and write */ 930 #define PNG_TRANSFORM_PACKSWAP 0x0008 /* read and write */ 931 #define PNG_TRANSFORM_EXPAND 0x0010 /* read only */ 932 #define PNG_TRANSFORM_INVERT_MONO 0x0020 /* read and write */ 933 #define PNG_TRANSFORM_SHIFT 0x0040 /* read and write */ 934 #define PNG_TRANSFORM_BGR 0x0080 /* read and write */ 935 #define PNG_TRANSFORM_SWAP_ALPHA 0x0100 /* read and write */ 936 #define PNG_TRANSFORM_SWAP_ENDIAN 0x0200 /* read and write */ 937 #define PNG_TRANSFORM_INVERT_ALPHA 0x0400 /* read and write */ 938 #define PNG_TRANSFORM_STRIP_FILLER 0x0800 /* WRITE only */ 939 940 /* Flags for MNG supported features */ 941 #define PNG_FLAG_MNG_EMPTY_PLTE 0x01 942 #define PNG_FLAG_MNG_FILTER_64 0x04 943 #define PNG_ALL_MNG_FEATURES 0x05 944 945 typedef png_voidp (*png_malloc_ptr) PNGARG((png_structp, png_size_t)); 946 typedef void (*png_free_ptr) PNGARG((png_structp, png_voidp)); 947 948 /* The structure that holds the information to read and write PNG files. 949 * The only people who need to care about what is inside of this are the 950 * people who will be modifying the library for their own special needs. 951 * It should NOT be accessed directly by an application, except to store 952 * the jmp_buf. 953 */ 954 955 struct png_struct_def 956 { 957 #ifdef PNG_SETJMP_SUPPORTED 958 jmp_buf jmpbuf; /* used in png_error */ 959 #endif 960 png_error_ptr error_fn; /* function for printing errors and aborting */ 961 png_error_ptr warning_fn; /* function for printing warnings */ 962 png_voidp error_ptr; /* user supplied struct for error functions */ 963 png_rw_ptr write_data_fn; /* function for writing output data */ 964 png_rw_ptr read_data_fn; /* function for reading input data */ 965 png_voidp io_ptr; /* ptr to application struct for I/O functions*/ 966 967 #if defined(PNG_READ_USER_TRANSFORM_SUPPORTED) 968 png_user_transform_ptr read_user_transform_fn; /* user read transform */ 969 #endif 970 971 #if defined(PNG_WRITE_USER_TRANSFORM_SUPPORTED) 972 png_user_transform_ptr write_user_transform_fn; /* user write transform */ 973 #endif 974 975 /* These were added in libpng-1.0.2 */ 976 #if defined(PNG_USER_TRANSFORM_PTR_SUPPORTED) 977 #if defined(PNG_READ_USER_TRANSFORM_SUPPORTED) || \ 978 defined(PNG_WRITE_USER_TRANSFORM_SUPPORTED) 979 png_voidp user_transform_ptr; /* user supplied struct for user transform */ 980 png_byte user_transform_depth; /* bit depth of user transformed pixels */ 981 png_byte user_transform_channels; /* channels in user transformed pixels */ 982 #endif 983 #endif 984 985 png_uint_32 mode; /* tells us where we are in the PNG file */ 986 png_uint_32 flags; /* flags indicating various things to libpng */ 987 png_uint_32 transformations; /* which transformations to perform */ 988 989 z_stream zstream; /* pointer to decompression structure (below) */ 990 png_bytep zbuf; /* buffer for zlib */ 991 png_size_t zbuf_size; /* size of zbuf */ 992 int zlib_level; /* holds zlib compression level */ 993 int zlib_method; /* holds zlib compression method */ 994 int zlib_window_bits; /* holds zlib compression window bits */ 995 int zlib_mem_level; /* holds zlib compression memory level */ 996 int zlib_strategy; /* holds zlib compression strategy */ 997 998 png_uint_32 width; /* width of image in pixels */ 999 png_uint_32 height; /* height of image in pixels */ 1000 png_uint_32 num_rows; /* number of rows in current pass */ 1001 png_uint_32 usr_width; /* width of row at start of write */ 1002 png_uint_32 rowbytes; /* size of row in bytes */ 1003 png_uint_32 irowbytes; /* size of current interlaced row in bytes */ 1004 png_uint_32 iwidth; /* width of current interlaced row in pixels */ 1005 png_uint_32 row_number; /* current row in interlace pass */ 1006 png_bytep prev_row; /* buffer to save previous (unfiltered) row */ 1007 png_bytep row_buf; /* buffer to save current (unfiltered) row */ 1008 png_bytep sub_row; /* buffer to save "sub" row when filtering */ 1009 png_bytep up_row; /* buffer to save "up" row when filtering */ 1010 png_bytep avg_row; /* buffer to save "avg" row when filtering */ 1011 png_bytep paeth_row; /* buffer to save "Paeth" row when filtering */ 1012 png_row_info row_info; /* used for transformation routines */ 1013 1014 png_uint_32 idat_size; /* current IDAT size for read */ 1015 png_uint_32 crc; /* current chunk CRC value */ 1016 png_colorp palette; /* palette from the input file */ 1017 png_uint_16 num_palette; /* number of color entries in palette */ 1018 png_uint_16 num_trans; /* number of transparency values */ 1019 png_byte chunk_name[5]; /* null-terminated name of current chunk */ 1020 png_byte compression; /* file compression type (always 0) */ 1021 png_byte filter; /* file filter type (always 0) */ 1022 png_byte interlaced; /* PNG_INTERLACE_NONE, PNG_INTERLACE_ADAM7 */ 1023 png_byte pass; /* current interlace pass (0 - 6) */ 1024 png_byte do_filter; /* row filter flags (see PNG_FILTER_ below ) */ 1025 png_byte color_type; /* color type of file */ 1026 png_byte bit_depth; /* bit depth of file */ 1027 png_byte usr_bit_depth; /* bit depth of users row */ 1028 png_byte pixel_depth; /* number of bits per pixel */ 1029 png_byte channels; /* number of channels in file */ 1030 png_byte usr_channels; /* channels at start of write */ 1031 png_byte sig_bytes; /* magic bytes read/written from start of file */ 1032 1033 #if defined(PNG_READ_FILLER_SUPPORTED) || defined(PNG_WRITE_FILLER_SUPPORTED) 1034 #ifdef PNG_LEGACY_SUPPORTED 1035 png_byte filler; /* filler byte for pixel expansion */ 1036 #else 1037 png_uint_16 filler; /* filler bytes for pixel expansion */ 1038 #endif 1039 #endif 1040 1041 #if defined(PNG_bKGD_SUPPORTED) 1042 png_byte background_gamma_type; 1043 # ifdef PNG_FLOATING_POINT_SUPPORTED 1044 float background_gamma; 1045 # endif 1046 png_color_16 background; /* background color in screen gamma space */ 1047 # if defined(PNG_READ_GAMMA_SUPPORTED) 1048 png_color_16 background_1; /* background normalized to gamma 1.0 */ 1049 # endif /* PNG_READ_GAMMA && PNG_bKGD_SUPPORTED */ 1050 #endif /* PNG_bKGD_SUPPORTED */ 1051 1052 #if defined(PNG_WRITE_FLUSH_SUPPORTED) 1053 png_flush_ptr output_flush_fn;/* Function for flushing output */ 1054 png_uint_32 flush_dist; /* how many rows apart to flush, 0 - no flush */ 1055 png_uint_32 flush_rows; /* number of rows written since last flush */ 1056 #endif 1057 1058 #if defined(PNG_READ_GAMMA_SUPPORTED) || defined(PNG_READ_BACKGROUND_SUPPORTED) 1059 int gamma_shift; /* number of "insignificant" bits 16-bit gamma */ 1060 #ifdef PNG_FLOATING_POINT_SUPPORTED 1061 float gamma; /* file gamma value */ 1062 float screen_gamma; /* screen gamma value (display_exponent) */ 1063 #endif 1064 #endif 1065 1066 #if defined(PNG_READ_GAMMA_SUPPORTED) || defined(PNG_READ_BACKGROUND_SUPPORTED) 1067 png_bytep gamma_table; /* gamma table for 8-bit depth files */ 1068 png_bytep gamma_from_1; /* converts from 1.0 to screen */ 1069 png_bytep gamma_to_1; /* converts from file to 1.0 */ 1070 png_uint_16pp gamma_16_table; /* gamma table for 16-bit depth files */ 1071 png_uint_16pp gamma_16_from_1; /* converts from 1.0 to screen */ 1072 png_uint_16pp gamma_16_to_1; /* converts from file to 1.0 */ 1073 #endif 1074 1075 #if defined(PNG_READ_GAMMA_SUPPORTED) || defined(PNG_sBIT_SUPPORTED) 1076 png_color_8 sig_bit; /* significant bits in each available channel */ 1077 #endif 1078 1079 #if defined(PNG_READ_SHIFT_SUPPORTED) || defined(PNG_WRITE_SHIFT_SUPPORTED) 1080 png_color_8 shift; /* shift for significant bit tranformation */ 1081 #endif 1082 1083 #if defined(PNG_tRNS_SUPPORTED) || defined(PNG_READ_BACKGROUND_SUPPORTED) \ 1084 || defined(PNG_READ_EXPAND_SUPPORTED) || defined(PNG_READ_BACKGROUND_SUPPORTED) 1085 png_bytep trans; /* transparency values for paletted files */ 1086 png_color_16 trans_values; /* transparency values for non-paletted files */ 1087 #endif 1088 1089 png_read_status_ptr read_row_fn; /* called after each row is decoded */ 1090 png_write_status_ptr write_row_fn; /* called after each row is encoded */ 1091 #ifdef PNG_PROGRESSIVE_READ_SUPPORTED 1092 png_progressive_info_ptr info_fn; /* called after header data fully read */ 1093 png_progressive_row_ptr row_fn; /* called after each prog. row is decoded */ 1094 png_progressive_end_ptr end_fn; /* called after image is complete */ 1095 png_bytep save_buffer_ptr; /* current location in save_buffer */ 1096 png_bytep save_buffer; /* buffer for previously read data */ 1097 png_bytep current_buffer_ptr; /* current location in current_buffer */ 1098 png_bytep current_buffer; /* buffer for recently used data */ 1099 png_uint_32 push_length; /* size of current input chunk */ 1100 png_uint_32 skip_length; /* bytes to skip in input data */ 1101 png_size_t save_buffer_size; /* amount of data now in save_buffer */ 1102 png_size_t save_buffer_max; /* total size of save_buffer */ 1103 png_size_t buffer_size; /* total amount of available input data */ 1104 png_size_t current_buffer_size; /* amount of data now in current_buffer */ 1105 int process_mode; /* what push library is currently doing */ 1106 int cur_palette; /* current push library palette index */ 1107 1108 # if defined(PNG_TEXT_SUPPORTED) 1109 png_size_t current_text_size; /* current size of text input data */ 1110 png_size_t current_text_left; /* how much text left to read in input */ 1111 png_charp current_text; /* current text chunk buffer */ 1112 png_charp current_text_ptr; /* current location in current_text */ 1113 # endif /* PNG_PROGRESSIVE_READ_SUPPORTED && PNG_TEXT_SUPPORTED */ 1114 1115 #endif /* PNG_PROGRESSIVE_READ_SUPPORTED */ 1116 1117 #if defined(__TURBOC__) && !defined(_Windows) && !defined(__FLAT__) 1118 /* for the Borland special 64K segment handler */ 1119 png_bytepp offset_table_ptr; 1120 png_bytep offset_table; 1121 png_uint_16 offset_table_number; 1122 png_uint_16 offset_table_count; 1123 png_uint_16 offset_table_count_free; 1124 #endif 1125 1126 #if defined(PNG_READ_DITHER_SUPPORTED) 1127 png_bytep palette_lookup; /* lookup table for dithering */ 1128 png_bytep dither_index; /* index translation for palette files */ 1129 #endif 1130 1131 #if defined(PNG_READ_DITHER_SUPPORTED) || defined(PNG_hIST_SUPPORTED) 1132 png_uint_16p hist; /* histogram */ 1133 #endif 1134 1135 #if defined(PNG_WRITE_WEIGHTED_FILTER_SUPPORTED) 1136 png_byte heuristic_method; /* heuristic for row filter selection */ 1137 png_byte num_prev_filters; /* number of weights for previous rows */ 1138 png_bytep prev_filters; /* filter type(s) of previous row(s) */ 1139 png_uint_16p filter_weights; /* weight(s) for previous line(s) */ 1140 png_uint_16p inv_filter_weights; /* 1/weight(s) for previous line(s) */ 1141 png_uint_16p filter_costs; /* relative filter calculation cost */ 1142 png_uint_16p inv_filter_costs; /* 1/relative filter calculation cost */ 1143 #endif 1144 1145 #if defined(PNG_TIME_RFC1123_SUPPORTED) 1146 png_charp time_buffer; /* String to hold RFC 1123 time text */ 1147 #endif 1148 1149 /* New members added in libpng-1.0.6 */ 1150 1151 #ifdef PNG_FREE_ME_SUPPORTED 1152 png_uint_32 free_me; /* flags items libpng is responsible for freeing */ 1153 #endif 1154 1155 #if defined(PNG_USER_CHUNKS_SUPPORTED) 1156 png_voidp user_chunk_ptr; 1157 png_user_chunk_ptr read_user_chunk_fn; /* user read chunk handler */ 1158 #endif 1159 1160 #if defined(PNG_UNKNOWN_CHUNKS_SUPPORTED) 1161 int num_chunk_list; 1162 png_bytep chunk_list; 1163 #endif 1164 1165 /* New members added in libpng-1.0.3 */ 1166 #if defined(PNG_READ_RGB_TO_GRAY_SUPPORTED) 1167 png_byte rgb_to_gray_status; 1168 /* These were changed from png_byte in libpng-1.0.6 */ 1169 png_uint_16 rgb_to_gray_red_coeff; 1170 png_uint_16 rgb_to_gray_green_coeff; 1171 png_uint_16 rgb_to_gray_blue_coeff; 1172 #endif 1173 1174 /* New member added in libpng-1.0.4 (renamed in 1.0.9) */ 1175 #if defined(PNG_MNG_FEATURES_SUPPORTED) || \ 1176 defined(PNG_READ_EMPTY_PLTE_SUPPORTED) || \ 1177 defined(PNG_WRITE_EMPTY_PLTE_SUPPORTED) 1178 /* changed from png_byte to png_uint_32 at version 1.2.0 */ 1179 png_uint_32 mng_features_permitted; 1180 #endif 1181 1182 /* New member added in libpng-1.0.7 */ 1183 #if defined(PNG_READ_GAMMA_SUPPORTED) || defined(PNG_READ_BACKGROUND_SUPPORTED) 1184 png_fixed_point int_gamma; 1185 #endif 1186 1187 /* New member added in libpng-1.0.9, ifdef'ed out in 1.0.12, enabled in 1.2.0 */ 1188 #if defined(PNG_MNG_FEATURES_SUPPORTED) 1189 png_byte filter_type; 1190 #endif 1191 1192 #if defined(PNG_DEBUG) && defined(PNG_USE_PNGGCCRD) 1193 /* New member added in libpng-1.0.10, ifdef'ed out in 1.2.0 */ 1194 png_uint_32 row_buf_size; 1195 #endif 1196 1197 /* New members added in libpng-1.2.0 */ 1198 #if defined(PNG_ASSEMBLER_CODE_SUPPORTED) 1199 png_byte mmx_bitdepth_threshold; 1200 png_uint_32 mmx_rowbytes_threshold; 1201 png_uint_32 asm_flags; 1202 #endif 1203 1204 /* New members added in libpng-1.0.2 but first enabled by default in 1.2.0 */ 1205 #ifdef PNG_USER_MEM_SUPPORTED 1206 png_voidp mem_ptr; /* user supplied struct for mem functions */ 1207 png_malloc_ptr malloc_fn; /* function for allocating memory */ 1208 png_free_ptr free_fn; /* function for freeing memory */ 1209 #endif 1210 1211 png_bytep big_row_buf; /* buffer to save current (unfiltered) row */ 1212 1213 }; 1214 1215 1216 /* This prevents a compiler error in png_get_copyright() in png.c if png.c 1217 and png.h are both at version 1.2.0 1218 */ 1219 typedef png_structp version_1_2_0; 1220 1221 typedef png_struct FAR * FAR * png_structpp; 1222 1223 /* Here are the function definitions most commonly used. This is not 1224 * the place to find out how to use libpng. See libpng.txt for the 1225 * full explanation, see example.c for the summary. This just provides 1226 * a simple one line description of the use of each function. 1227 */ 1228 1229 /* Returns the version number of the library */ 1230 extern PNG_EXPORT(png_uint_32,png_access_version_number) PNGARG((void)); 1231 1232 /* Tell lib we have already handled the first <num_bytes> magic bytes. 1233 * Handling more than 8 bytes from the beginning of the file is an error. 1234 */ 1235 extern PNG_EXPORT(void,png_set_sig_bytes) PNGARG((png_structp png_ptr, 1236 int num_bytes)); 1237 1238 /* Check sig[start] through sig[start + num_to_check - 1] to see if it's a 1239 * PNG file. Returns zero if the supplied bytes match the 8-byte PNG 1240 * signature, and non-zero otherwise. Having num_to_check == 0 or 1241 * start > 7 will always fail (ie return non-zero). 1242 */ 1243 extern PNG_EXPORT(int,png_sig_cmp) PNGARG((png_bytep sig, png_size_t start, 1244 png_size_t num_to_check)); 1245 1246 /* Simple signature checking function. This is the same as calling 1247 * png_check_sig(sig, n) := !png_sig_cmp(sig, 0, n). 1248 */ 1249 extern PNG_EXPORT(int,png_check_sig) PNGARG((png_bytep sig, int num)); 1250 1251 /* Allocate and initialize png_ptr struct for reading, and any other memory. */ 1252 extern PNG_EXPORT(png_structp,png_create_read_struct) 1253 PNGARG((png_const_charp user_png_ver, png_voidp error_ptr, 1254 png_error_ptr error_fn, png_error_ptr warn_fn)); 1255 1256 /* Allocate and initialize png_ptr struct for writing, and any other memory */ 1257 extern PNG_EXPORT(png_structp,png_create_write_struct) 1258 PNGARG((png_const_charp user_png_ver, png_voidp error_ptr, 1259 png_error_ptr error_fn, png_error_ptr warn_fn)); 1260 1261 extern PNG_EXPORT(png_uint_32,png_get_compression_buffer_size) 1262 PNGARG((png_structp png_ptr)); 1263 1264 extern PNG_EXPORT(void,png_set_compression_buffer_size) 1265 PNGARG((png_structp png_ptr, png_uint_32 size)); 1266 1267 /* Reset the compression stream */ 1268 extern PNG_EXPORT(int,png_reset_zstream) PNGARG((png_structp png_ptr)); 1269 1270 /* New functions added in libpng-1.0.2 (not enabled by default until 1.2.0) */ 1271 #ifdef PNG_USER_MEM_SUPPORTED 1272 extern PNG_EXPORT(png_structp,png_create_read_struct_2) 1273 PNGARG((png_const_charp user_png_ver, png_voidp error_ptr, 1274 png_error_ptr error_fn, png_error_ptr warn_fn, png_voidp mem_ptr, 1275 png_malloc_ptr malloc_fn, png_free_ptr free_fn)); 1276 extern PNG_EXPORT(png_structp,png_create_write_struct_2) 1277 PNGARG((png_const_charp user_png_ver, png_voidp error_ptr, 1278 png_error_ptr error_fn, png_error_ptr warn_fn, png_voidp mem_ptr, 1279 png_malloc_ptr malloc_fn, png_free_ptr free_fn)); 1280 #endif 1281 1282 /* Write a PNG chunk - size, type, (optional) data, CRC. */ 1283 extern PNG_EXPORT(void,png_write_chunk) PNGARG((png_structp png_ptr, 1284 png_bytep chunk_name, png_bytep data, png_size_t length)); 1285 1286 /* Write the start of a PNG chunk - length and chunk name. */ 1287 extern PNG_EXPORT(void,png_write_chunk_start) PNGARG((png_structp png_ptr, 1288 png_bytep chunk_name, png_uint_32 length)); 1289 1290 /* Write the data of a PNG chunk started with png_write_chunk_start(). */ 1291 extern PNG_EXPORT(void,png_write_chunk_data) PNGARG((png_structp png_ptr, 1292 png_bytep data, png_size_t length)); 1293 1294 /* Finish a chunk started with png_write_chunk_start() (includes CRC). */ 1295 extern PNG_EXPORT(void,png_write_chunk_end) PNGARG((png_structp png_ptr)); 1296 1297 /* Allocate and initialize the info structure */ 1298 extern PNG_EXPORT(png_infop,png_create_info_struct) 1299 PNGARG((png_structp png_ptr)); 1300 1301 /* Initialize the info structure (old interface - DEPRECATED) */ 1302 extern PNG_EXPORT(void,png_info_init) PNGARG((png_infop info_ptr)); 1303 #define png_info_init(info_ptr) png_info_init_3(&info_ptr, sizeof(png_info)); 1304 extern PNG_EXPORT(void,png_info_init_3) PNGARG((png_infopp info_ptr, 1305 png_size_t png_info_struct_size)); 1306 1307 /* Writes all the PNG information before the image. */ 1308 extern PNG_EXPORT(void,png_write_info_before_PLTE) PNGARG((png_structp png_ptr, 1309 png_infop info_ptr)); 1310 extern PNG_EXPORT(void,png_write_info) PNGARG((png_structp png_ptr, 1311 png_infop info_ptr)); 1312 1313 /* read the information before the actual image data. */ 1314 extern PNG_EXPORT(void,png_read_info) PNGARG((png_structp png_ptr, 1315 png_infop info_ptr)); 1316 1317 #if defined(PNG_TIME_RFC1123_SUPPORTED) 1318 extern PNG_EXPORT(png_charp,png_convert_to_rfc1123) 1319 PNGARG((png_structp png_ptr, png_timep ptime)); 1320 #endif 1321 1322 #if !defined(_WIN32_WCE) 1323 /* "time.h" functions are not supported on WindowsCE */ 1324 #if defined(PNG_WRITE_tIME_SUPPORTED) 1325 /* convert from a struct tm to png_time */ 1326 extern PNG_EXPORT(void,png_convert_from_struct_tm) PNGARG((png_timep ptime, 1327 struct tm FAR * ttime)); 1328 1329 /* convert from time_t to png_time. Uses gmtime() */ 1330 extern PNG_EXPORT(void,png_convert_from_time_t) PNGARG((png_timep ptime, 1331 time_t ttime)); 1332 #endif /* PNG_WRITE_tIME_SUPPORTED */ 1333 #endif /* _WIN32_WCE */ 1334 1335 #if defined(PNG_READ_EXPAND_SUPPORTED) 1336 /* Expand data to 24-bit RGB, or 8-bit grayscale, with alpha if available. */ 1337 extern PNG_EXPORT(void,png_set_expand) PNGARG((png_structp png_ptr)); 1338 extern PNG_EXPORT(void,png_set_gray_1_2_4_to_8) PNGARG((png_structp png_ptr)); 1339 extern PNG_EXPORT(void,png_set_palette_to_rgb) PNGARG((png_structp png_ptr)); 1340 extern PNG_EXPORT(void,png_set_tRNS_to_alpha) PNGARG((png_structp png_ptr)); 1341 #endif 1342 1343 #if defined(PNG_READ_BGR_SUPPORTED) || defined(PNG_WRITE_BGR_SUPPORTED) 1344 /* Use blue, green, red order for pixels. */ 1345 extern PNG_EXPORT(void,png_set_bgr) PNGARG((png_structp png_ptr)); 1346 #endif 1347 1348 #if defined(PNG_READ_GRAY_TO_RGB_SUPPORTED) 1349 /* Expand the grayscale to 24-bit RGB if necessary. */ 1350 extern PNG_EXPORT(void,png_set_gray_to_rgb) PNGARG((png_structp png_ptr)); 1351 #endif 1352 1353 #if defined(PNG_READ_RGB_TO_GRAY_SUPPORTED) 1354 /* Reduce RGB to grayscale. */ 1355 #ifdef PNG_FLOATING_POINT_SUPPORTED 1356 extern PNG_EXPORT(void,png_set_rgb_to_gray) PNGARG((png_structp png_ptr, 1357 int error_action, double red, double green )); 1358 #endif 1359 extern PNG_EXPORT(void,png_set_rgb_to_gray_fixed) PNGARG((png_structp png_ptr, 1360 int error_action, png_fixed_point red, png_fixed_point green )); 1361 extern PNG_EXPORT(png_byte,png_get_rgb_to_gray_status) PNGARG((png_structp 1362 png_ptr)); 1363 #endif 1364 1365 extern PNG_EXPORT(void,png_build_grayscale_palette) PNGARG((int bit_depth, 1366 png_colorp palette)); 1367 1368 #if defined(PNG_READ_STRIP_ALPHA_SUPPORTED) 1369 extern PNG_EXPORT(void,png_set_strip_alpha) PNGARG((png_structp png_ptr)); 1370 #endif 1371 1372 #if defined(PNG_READ_SWAP_ALPHA_SUPPORTED) || \ 1373 defined(PNG_WRITE_SWAP_ALPHA_SUPPORTED) 1374 extern PNG_EXPORT(void,png_set_swap_alpha) PNGARG((png_structp png_ptr)); 1375 #endif 1376 1377 #if defined(PNG_READ_INVERT_ALPHA_SUPPORTED) || \ 1378 defined(PNG_WRITE_INVERT_ALPHA_SUPPORTED) 1379 extern PNG_EXPORT(void,png_set_invert_alpha) PNGARG((png_structp png_ptr)); 1380 #endif 1381 1382 #if defined(PNG_READ_FILLER_SUPPORTED) || defined(PNG_WRITE_FILLER_SUPPORTED) 1383 /* Add a filler byte to 24-bit RGB images. */ 1384 extern PNG_EXPORT(void,png_set_filler) PNGARG((png_structp png_ptr, 1385 png_uint_32 filler, int flags)); 1386 /* The values of the PNG_FILLER_ defines should NOT be changed */ 1387 #define PNG_FILLER_BEFORE 0 1388 #define PNG_FILLER_AFTER 1 1389 #endif /* PNG_READ_FILLER_SUPPORTED || PNG_WRITE_FILLER_SUPPORTED */ 1390 1391 #if defined(PNG_READ_SWAP_SUPPORTED) || defined(PNG_WRITE_SWAP_SUPPORTED) 1392 /* Swap bytes in 16-bit depth files. */ 1393 extern PNG_EXPORT(void,png_set_swap) PNGARG((png_structp png_ptr)); 1394 #endif 1395 1396 #if defined(PNG_READ_PACK_SUPPORTED) || defined(PNG_WRITE_PACK_SUPPORTED) 1397 /* Use 1 byte per pixel in 1, 2, or 4-bit depth files. */ 1398 extern PNG_EXPORT(void,png_set_packing) PNGARG((png_structp png_ptr)); 1399 #endif 1400 1401 #if defined(PNG_READ_PACKSWAP_SUPPORTED) || defined(PNG_WRITE_PACKSWAP_SUPPORTED) 1402 /* Swap packing order of pixels in bytes. */ 1403 extern PNG_EXPORT(void,png_set_packswap) PNGARG((png_structp png_ptr)); 1404 #endif 1405 1406 #if defined(PNG_READ_SHIFT_SUPPORTED) || defined(PNG_WRITE_SHIFT_SUPPORTED) 1407 /* Converts files to legal bit depths. */ 1408 extern PNG_EXPORT(void,png_set_shift) PNGARG((png_structp png_ptr, 1409 png_color_8p true_bits)); 1410 #endif 1411 1412 #if defined(PNG_READ_INTERLACING_SUPPORTED) || \ 1413 defined(PNG_WRITE_INTERLACING_SUPPORTED) 1414 /* Have the code handle the interlacing. Returns the number of passes. */ 1415 extern PNG_EXPORT(int,png_set_interlace_handling) PNGARG((png_structp png_ptr)); 1416 #endif 1417 1418 #if defined(PNG_READ_INVERT_SUPPORTED) || defined(PNG_WRITE_INVERT_SUPPORTED) 1419 /* Invert monochrome files */ 1420 extern PNG_EXPORT(void,png_set_invert_mono) PNGARG((png_structp png_ptr)); 1421 #endif 1422 1423 #if defined(PNG_READ_BACKGROUND_SUPPORTED) 1424 /* Handle alpha and tRNS by replacing with a background color. */ 1425 #ifdef PNG_FLOATING_POINT_SUPPORTED 1426 extern PNG_EXPORT(void,png_set_background) PNGARG((png_structp png_ptr, 1427 png_color_16p background_color, int background_gamma_code, 1428 int need_expand, double background_gamma)); 1429 #endif 1430 #define PNG_BACKGROUND_GAMMA_UNKNOWN 0 1431 #define PNG_BACKGROUND_GAMMA_SCREEN 1 1432 #define PNG_BACKGROUND_GAMMA_FILE 2 1433 #define PNG_BACKGROUND_GAMMA_UNIQUE 3 1434 #endif 1435 1436 #if defined(PNG_READ_16_TO_8_SUPPORTED) 1437 /* strip the second byte of information from a 16-bit depth file. */ 1438 extern PNG_EXPORT(void,png_set_strip_16) PNGARG((png_structp png_ptr)); 1439 #endif 1440 1441 #if defined(PNG_READ_DITHER_SUPPORTED) 1442 /* Turn on dithering, and reduce the palette to the number of colors available. */ 1443 extern PNG_EXPORT(void,png_set_dither) PNGARG((png_structp png_ptr, 1444 png_colorp palette, int num_palette, int maximum_colors, 1445 png_uint_16p histogram, int full_dither)); 1446 #endif 1447 1448 #if defined(PNG_READ_GAMMA_SUPPORTED) 1449 /* Handle gamma correction. Screen_gamma=(display_exponent) */ 1450 #ifdef PNG_FLOATING_POINT_SUPPORTED 1451 extern PNG_EXPORT(void,png_set_gamma) PNGARG((png_structp png_ptr, 1452 double screen_gamma, double default_file_gamma)); 1453 #endif 1454 #endif 1455 1456 #if defined(PNG_READ_EMPTY_PLTE_SUPPORTED) || \ 1457 defined(PNG_WRITE_EMPTY_PLTE_SUPPORTED) 1458 /* Permit or disallow empty PLTE (0: not permitted, 1: permitted) */ 1459 /* Deprecated and will be removed. Use png_permit_mng_features() instead. */ 1460 extern PNG_EXPORT(void,png_permit_empty_plte) PNGARG((png_structp png_ptr, 1461 int empty_plte_permitted)); 1462 #endif 1463 1464 #if defined(PNG_WRITE_FLUSH_SUPPORTED) 1465 /* Set how many lines between output flushes - 0 for no flushing */ 1466 extern PNG_EXPORT(void,png_set_flush) PNGARG((png_structp png_ptr, int nrows)); 1467 /* Flush the current PNG output buffer */ 1468 extern PNG_EXPORT(void,png_write_flush) PNGARG((png_structp png_ptr)); 1469 #endif 1470 1471 /* optional update palette with requested transformations */ 1472 extern PNG_EXPORT(void,png_start_read_image) PNGARG((png_structp png_ptr)); 1473 1474 /* optional call to update the users info structure */ 1475 extern PNG_EXPORT(void,png_read_update_info) PNGARG((png_structp png_ptr, 1476 png_infop info_ptr)); 1477 1478 /* read a one or more rows of image data.*/ 1479 extern PNG_EXPORT(void,png_read_rows) PNGARG((png_structp png_ptr, 1480 png_bytepp row, png_bytepp display_row, png_uint_32 num_rows)); 1481 1482 /* read a row of data.*/ 1483 extern PNG_EXPORT(void,png_read_row) PNGARG((png_structp png_ptr, 1484 png_bytep row, 1485 png_bytep display_row)); 1486 1487 /* read the whole image into memory at once. */ 1488 extern PNG_EXPORT(void,png_read_image) PNGARG((png_structp png_ptr, 1489 png_bytepp image)); 1490 1491 /* write a row of image data */ 1492 extern PNG_EXPORT(void,png_write_row) PNGARG((png_structp png_ptr, 1493 png_bytep row)); 1494 1495 /* write a few rows of image data */ 1496 extern PNG_EXPORT(void,png_write_rows) PNGARG((png_structp png_ptr, 1497 png_bytepp row, png_uint_32 num_rows)); 1498 1499 /* write the image data */ 1500 extern PNG_EXPORT(void,png_write_image) PNGARG((png_structp png_ptr, 1501 png_bytepp image)); 1502 1503 /* writes the end of the PNG file. */ 1504 extern PNG_EXPORT(void,png_write_end) PNGARG((png_structp png_ptr, 1505 png_infop info_ptr)); 1506 1507 /* read the end of the PNG file. */ 1508 extern PNG_EXPORT(void,png_read_end) PNGARG((png_structp png_ptr, 1509 png_infop info_ptr)); 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)); 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 info_ptr struct (old method - NOT DLL EXPORTED) */ 1528 extern void png_write_destroy_info PNGARG((png_infop info_ptr)); 1529 1530 /* free any memory used in png_ptr struct (old method - NOT DLL EXPORTED) */ 1531 extern void png_write_destroy PNGARG((png_structp png_ptr)); 1532 1533 /* set the libpng method of handling chunk CRC errors */ 1534 extern PNG_EXPORT(void,png_set_crc_action) PNGARG((png_structp png_ptr, 1535 int crit_action, int ancil_action)); 1536 1537 /* Values for png_set_crc_action() to say how to handle CRC errors in 1538 * ancillary and critical chunks, and whether to use the data contained 1539 * therein. Note that it is impossible to "discard" data in a critical 1540 * chunk. For versions prior to 0.90, the action was always error/quit, 1541 * whereas in version 0.90 and later, the action for CRC errors in ancillary 1542 * chunks is warn/discard. These values should NOT be changed. 1543 * 1544 * value action:critical action:ancillary 1545 */ 1546 #define PNG_CRC_DEFAULT 0 /* error/quit warn/discard data */ 1547 #define PNG_CRC_ERROR_QUIT 1 /* error/quit error/quit */ 1548 #define PNG_CRC_WARN_DISCARD 2 /* (INVALID) warn/discard data */ 1549 #define PNG_CRC_WARN_USE 3 /* warn/use data warn/use data */ 1550 #define PNG_CRC_QUIET_USE 4 /* quiet/use data quiet/use data */ 1551 #define PNG_CRC_NO_CHANGE 5 /* use current value use current value */ 1552 1553 /* These functions give the user control over the scan-line filtering in 1554 * libpng and the compression methods used by zlib. These functions are 1555 * mainly useful for testing, as the defaults should work with most users. 1556 * Those users who are tight on memory or want faster performance at the 1557 * expense of compression can modify them. See the compression library 1558 * header file (zlib.h) for an explination of the compression functions. 1559 */ 1560 1561 /* set the filtering method(s) used by libpng. Currently, the only valid 1562 * value for "method" is 0. 1563 */ 1564 extern PNG_EXPORT(void,png_set_filter) PNGARG((png_structp png_ptr, int method, 1565 int filters)); 1566 1567 /* Flags for png_set_filter() to say which filters to use. The flags 1568 * are chosen so that they don't conflict with real filter types 1569 * below, in case they are supplied instead of the #defined constants. 1570 * These values should NOT be changed. 1571 */ 1572 #define PNG_NO_FILTERS 0x00 1573 #define PNG_FILTER_NONE 0x08 1574 #define PNG_FILTER_SUB 0x10 1575 #define PNG_FILTER_UP 0x20 1576 #define PNG_FILTER_AVG 0x40 1577 #define PNG_FILTER_PAETH 0x80 1578 #define PNG_ALL_FILTERS (PNG_FILTER_NONE | PNG_FILTER_SUB | PNG_FILTER_UP | \ 1579 PNG_FILTER_AVG | PNG_FILTER_PAETH) 1580 1581 /* Filter values (not flags) - used in pngwrite.c, pngwutil.c for now. 1582 * These defines should NOT be changed. 1583 */ 1584 #define PNG_FILTER_VALUE_NONE 0 1585 #define PNG_FILTER_VALUE_SUB 1 1586 #define PNG_FILTER_VALUE_UP 2 1587 #define PNG_FILTER_VALUE_AVG 3 1588 #define PNG_FILTER_VALUE_PAETH 4 1589 #define PNG_FILTER_VALUE_LAST 5 1590 1591 #if defined(PNG_WRITE_WEIGHTED_FILTER_SUPPORTED) /* EXPERIMENTAL */ 1592 /* The "heuristic_method" is given by one of the PNG_FILTER_HEURISTIC_ 1593 * defines, either the default (minimum-sum-of-absolute-differences), or 1594 * the experimental method (weighted-minimum-sum-of-absolute-differences). 1595 * 1596 * Weights are factors >= 1.0, indicating how important it is to keep the 1597 * filter type consistent between rows. Larger numbers mean the current 1598 * filter is that many times as likely to be the same as the "num_weights" 1599 * previous filters. This is cumulative for each previous row with a weight. 1600 * There needs to be "num_weights" values in "filter_weights", or it can be 1601 * NULL if the weights aren't being specified. Weights have no influence on 1602 * the selection of the first row filter. Well chosen weights can (in theory) 1603 * improve the compression for a given image. 1604 * 1605 * Costs are factors >= 1.0 indicating the relative decoding costs of a 1606 * filter type. Higher costs indicate more decoding expense, and are 1607 * therefore less likely to be selected over a filter with lower computational 1608 * costs. There needs to be a value in "filter_costs" for each valid filter 1609 * type (given by PNG_FILTER_VALUE_LAST), or it can be NULL if you aren't 1610 * setting the costs. Costs try to improve the speed of decompression without 1611 * unduly increasing the compressed image size. 1612 * 1613 * A negative weight or cost indicates the default value is to be used, and 1614 * values in the range [0.0, 1.0) indicate the value is to remain unchanged. 1615 * The default values for both weights and costs are currently 1.0, but may 1616 * change if good general weighting/cost heuristics can be found. If both 1617 * the weights and costs are set to 1.0, this degenerates the WEIGHTED method 1618 * to the UNWEIGHTED method, but with added encoding time/computation. 1619 */ 1620 #ifdef PNG_FLOATING_POINT_SUPPORTED 1621 extern PNG_EXPORT(void,png_set_filter_heuristics) PNGARG((png_structp png_ptr, 1622 int heuristic_method, int num_weights, png_doublep filter_weights, 1623 png_doublep filter_costs)); 1624 #endif 1625 #endif /* PNG_WRITE_WEIGHTED_FILTER_SUPPORTED */ 1626 1627 /* Heuristic used for row filter selection. These defines should NOT be 1628 * changed. 1629 */ 1630 #define PNG_FILTER_HEURISTIC_DEFAULT 0 /* Currently "UNWEIGHTED" */ 1631 #define PNG_FILTER_HEURISTIC_UNWEIGHTED 1 /* Used by libpng < 0.95 */ 1632 #define PNG_FILTER_HEURISTIC_WEIGHTED 2 /* Experimental feature */ 1633 #define PNG_FILTER_HEURISTIC_LAST 3 /* Not a valid value */ 1634 1635 /* Set the library compression level. Currently, valid values range from 1636 * 0 - 9, corresponding directly to the zlib compression levels 0 - 9 1637 * (0 - no compression, 9 - "maximal" compression). Note that tests have 1638 * shown that zlib compression levels 3-6 usually perform as well as level 9 1639 * for PNG images, and do considerably fewer caclulations. In the future, 1640 * these values may not correspond directly to the zlib compression levels. 1641 */ 1642 extern PNG_EXPORT(void,png_set_compression_level) PNGARG((png_structp png_ptr, 1643 int level)); 1644 1645 extern PNG_EXPORT(void,png_set_compression_mem_level) 1646 PNGARG((png_structp png_ptr, int mem_level)); 1647 1648 extern PNG_EXPORT(void,png_set_compression_strategy) 1649 PNGARG((png_structp png_ptr, int strategy)); 1650 1651 extern PNG_EXPORT(void,png_set_compression_window_bits) 1652 PNGARG((png_structp png_ptr, int window_bits)); 1653 1654 extern PNG_EXPORT(void,png_set_compression_method) PNGARG((png_structp png_ptr, 1655 int method)); 1656 1657 /* These next functions are called for input/output, memory, and error 1658 * handling. They are in the file pngrio.c, pngwio.c, and pngerror.c, 1659 * and call standard C I/O routines such as fread(), fwrite(), and 1660 * fprintf(). These functions can be made to use other I/O routines 1661 * at run time for those applications that need to handle I/O in a 1662 * different manner by calling png_set_???_fn(). See libpng.txt for 1663 * more information. 1664 */ 1665 1666 #if !defined(PNG_NO_STDIO) 1667 /* Initialize the input/output for the PNG file to the default functions. */ 1668 extern PNG_EXPORT(void,png_init_io) PNGARG((png_structp png_ptr, png_FILE_p fp)); 1669 #endif 1670 1671 /* Replace the (error and abort), and warning functions with user 1672 * supplied functions. If no messages are to be printed you must still 1673 * write and use replacement functions. The replacement error_fn should 1674 * still do a longjmp to the last setjmp location if you are using this 1675 * method of error handling. If error_fn or warning_fn is NULL, the 1676 * default function will be used. 1677 */ 1678 1679 extern PNG_EXPORT(void,png_set_error_fn) PNGARG((png_structp png_ptr, 1680 png_voidp error_ptr, png_error_ptr error_fn, png_error_ptr warning_fn)); 1681 1682 /* Return the user pointer associated with the error functions */ 1683 extern PNG_EXPORT(png_voidp,png_get_error_ptr) PNGARG((png_structp png_ptr)); 1684 1685 /* Replace the default data output functions with a user supplied one(s). 1686 * If buffered output is not used, then output_flush_fn can be set to NULL. 1687 * If PNG_WRITE_FLUSH_SUPPORTED is not defined at libpng compile time 1688 * output_flush_fn will be ignored (and thus can be NULL). 1689 */ 1690 extern PNG_EXPORT(void,png_set_write_fn) PNGARG((png_structp png_ptr, 1691 png_voidp io_ptr, png_rw_ptr write_data_fn, png_flush_ptr output_flush_fn)); 1692 1693 /* Replace the default data input function with a user supplied one. */ 1694 extern PNG_EXPORT(void,png_set_read_fn) PNGARG((png_structp png_ptr, 1695 png_voidp io_ptr, png_rw_ptr read_data_fn)); 1696 1697 /* Return the user pointer associated with the I/O functions */ 1698 extern PNG_EXPORT(png_voidp,png_get_io_ptr) PNGARG((png_structp png_ptr)); 1699 1700 extern PNG_EXPORT(void,png_set_read_status_fn) PNGARG((png_structp png_ptr, 1701 png_read_status_ptr read_row_fn)); 1702 1703 extern PNG_EXPORT(void,png_set_write_status_fn) PNGARG((png_structp png_ptr, 1704 png_write_status_ptr write_row_fn)); 1705 1706 #ifdef PNG_USER_MEM_SUPPORTED 1707 /* Replace the default memory allocation functions with user supplied one(s). */ 1708 extern PNG_EXPORT(void,png_set_mem_fn) PNGARG((png_structp png_ptr, 1709 png_voidp mem_ptr, png_malloc_ptr malloc_fn, png_free_ptr free_fn)); 1710 /* Return the user pointer associated with the memory functions */ 1711 extern PNG_EXPORT(png_voidp,png_get_mem_ptr) PNGARG((png_structp png_ptr)); 1712 #endif 1713 1714 #if defined(PNG_READ_USER_TRANSFORM_SUPPORTED) || \ 1715 defined(PNG_LEGACY_SUPPORTED) 1716 extern PNG_EXPORT(void,png_set_read_user_transform_fn) PNGARG((png_structp 1717 png_ptr, png_user_transform_ptr read_user_transform_fn)); 1718 #endif 1719 1720 #if defined(PNG_WRITE_USER_TRANSFORM_SUPPORTED) || \ 1721 defined(PNG_LEGACY_SUPPORTED) 1722 extern PNG_EXPORT(void,png_set_write_user_transform_fn) PNGARG((png_structp 1723 png_ptr, png_user_transform_ptr write_user_transform_fn)); 1724 #endif 1725 1726 #if defined(PNG_READ_USER_TRANSFORM_SUPPORTED) || \ 1727 defined(PNG_WRITE_USER_TRANSFORM_SUPPORTED) || \ 1728 defined(PNG_LEGACY_SUPPORTED) 1729 extern PNG_EXPORT(void,png_set_user_transform_info) PNGARG((png_structp 1730 png_ptr, png_voidp user_transform_ptr, int user_transform_depth, 1731 int user_transform_channels)); 1732 /* Return the user pointer associated with the user transform functions */ 1733 extern PNG_EXPORT(png_voidp,png_get_user_transform_ptr) 1734 PNGARG((png_structp png_ptr)); 1735 #endif 1736 1737 #ifdef PNG_USER_CHUNKS_SUPPORTED 1738 extern PNG_EXPORT(void,png_set_read_user_chunk_fn) PNGARG((png_structp png_ptr, 1739 png_voidp user_chunk_ptr, png_user_chunk_ptr read_user_chunk_fn)); 1740 extern PNG_EXPORT(png_voidp,png_get_user_chunk_ptr) PNGARG((png_structp 1741 png_ptr)); 1742 #endif 1743 1744 #ifdef PNG_PROGRESSIVE_READ_SUPPORTED 1745 /* Sets the function callbacks for the push reader, and a pointer to a 1746 * user-defined structure available to the callback functions. 1747 */ 1748 extern PNG_EXPORT(void,png_set_progressive_read_fn) PNGARG((png_structp png_ptr, 1749 png_voidp progressive_ptr, 1750 png_progressive_info_ptr info_fn, png_progressive_row_ptr row_fn, 1751 png_progressive_end_ptr end_fn)); 1752 1753 /* returns the user pointer associated with the push read functions */ 1754 extern PNG_EXPORT(png_voidp,png_get_progressive_ptr) 1755 PNGARG((png_structp png_ptr)); 1756 1757 /* function to be called when data becomes available */ 1758 extern PNG_EXPORT(void,png_process_data) PNGARG((png_structp png_ptr, 1759 png_infop info_ptr, png_bytep buffer, png_size_t buffer_size)); 1760 1761 /* function that combines rows. Not very much different than the 1762 * png_combine_row() call. Is this even used????? 1763 */ 1764 extern PNG_EXPORT(void,png_progressive_combine_row) PNGARG((png_structp png_ptr, 1765 png_bytep old_row, png_bytep new_row)); 1766 #endif /* PNG_PROGRESSIVE_READ_SUPPORTED */ 1767 1768 extern PNG_EXPORT(png_voidp,png_malloc) PNGARG((png_structp png_ptr, 1769 png_uint_32 size)); 1770 1771 /* frees a pointer allocated by png_malloc() */ 1772 extern PNG_EXPORT(void,png_free) PNGARG((png_structp png_ptr, png_voidp ptr)); 1773 1774 /* Free data that was allocated internally */ 1775 extern PNG_EXPORT(void,png_free_data) PNGARG((png_structp png_ptr, 1776 png_infop info_ptr, png_uint_32 free_me, int num)); 1777 #ifdef PNG_FREE_ME_SUPPORTED 1778 /* Reassign responsibility for freeing existing data, whether allocated 1779 * by libpng or by the application */ 1780 extern PNG_EXPORT(void,png_data_freer) PNGARG((png_structp png_ptr, 1781 png_infop info_ptr, int freer, png_uint_32 mask)); 1782 #endif 1783 /* assignments for png_data_freer */ 1784 #define PNG_DESTROY_WILL_FREE_DATA 1 1785 #define PNG_SET_WILL_FREE_DATA 1 1786 #define PNG_USER_WILL_FREE_DATA 2 1787 /* Flags for png_ptr->free_me and info_ptr->free_me */ 1788 #define PNG_FREE_HIST 0x0008 1789 #define PNG_FREE_ICCP 0x0010 1790 #define PNG_FREE_SPLT 0x0020 1791 #define PNG_FREE_ROWS 0x0040 1792 #define PNG_FREE_PCAL 0x0080 1793 #define PNG_FREE_SCAL 0x0100 1794 #define PNG_FREE_UNKN 0x0200 1795 #define PNG_FREE_LIST 0x0400 1796 #define PNG_FREE_PLTE 0x1000 1797 #define PNG_FREE_TRNS 0x2000 1798 #define PNG_FREE_TEXT 0x4000 1799 #define PNG_FREE_ALL 0x7fff 1800 #define PNG_FREE_MUL 0x4220 /* PNG_FREE_SPLT|PNG_FREE_TEXT|PNG_FREE_UNKN */ 1801 1802 #ifdef PNG_USER_MEM_SUPPORTED 1803 extern PNG_EXPORT(png_voidp,png_malloc_default) PNGARG((png_structp png_ptr, 1804 png_uint_32 size)); 1805 extern PNG_EXPORT(void,png_free_default) PNGARG((png_structp png_ptr, 1806 png_voidp ptr)); 1807 #endif 1808 1809 extern PNG_EXPORT(png_voidp,png_memcpy_check) PNGARG((png_structp png_ptr, 1810 png_voidp s1, png_voidp s2, png_uint_32 size)); 1811 1812 extern PNG_EXPORT(png_voidp,png_memset_check) PNGARG((png_structp png_ptr, 1813 png_voidp s1, int value, png_uint_32 size)); 1814 1815 #if defined(USE_FAR_KEYWORD) /* memory model conversion function */ 1816 extern void *png_far_to_near PNGARG((png_structp png_ptr,png_voidp ptr, 1817 int check)); 1818 #endif /* USE_FAR_KEYWORD */ 1819 1820 /* Fatal error in PNG image of libpng - can't continue */ 1821 extern PNG_EXPORT(void,png_error) PNGARG((png_structp png_ptr, 1822 png_const_charp error)); 1823 1824 /* The same, but the chunk name is prepended to the error string. */ 1825 extern PNG_EXPORT(void,png_chunk_error) PNGARG((png_structp png_ptr, 1826 png_const_charp error)); 1827 1828 /* Non-fatal error in libpng. Can continue, but may have a problem. */ 1829 extern PNG_EXPORT(void,png_warning) PNGARG((png_structp png_ptr, 1830 png_const_charp message)); 1831 1832 /* Non-fatal error in libpng, chunk name is prepended to message. */ 1833 extern PNG_EXPORT(void,png_chunk_warning) PNGARG((png_structp png_ptr, 1834 png_const_charp message)); 1835 1836 /* The png_set_<chunk> functions are for storing values in the png_info_struct. 1837 * Similarly, the png_get_<chunk> calls are used to read values from the 1838 * png_info_struct, either storing the parameters in the passed variables, or 1839 * setting pointers into the png_info_struct where the data is stored. The 1840 * png_get_<chunk> functions return a non-zero value if the data was available 1841 * in info_ptr, or return zero and do not change any of the parameters if the 1842 * data was not available. 1843 * 1844 * These functions should be used instead of directly accessing png_info 1845 * to avoid problems with future changes in the size and internal layout of 1846 * png_info_struct. 1847 */ 1848 /* Returns "flag" if chunk data is valid in info_ptr. */ 1849 extern PNG_EXPORT(png_uint_32,png_get_valid) PNGARG((png_structp png_ptr, 1850 png_infop info_ptr, png_uint_32 flag)); 1851 1852 /* Returns number of bytes needed to hold a transformed row. */ 1853 extern PNG_EXPORT(png_uint_32,png_get_rowbytes) PNGARG((png_structp png_ptr, 1854 png_infop info_ptr)); 1855 1856 #if defined(PNG_INFO_IMAGE_SUPPORTED) 1857 /* Returns row_pointers, which is an array of pointers to scanlines that was 1858 returned from png_read_png(). */ 1859 extern PNG_EXPORT(png_bytepp,png_get_rows) PNGARG((png_structp png_ptr, 1860 png_infop info_ptr)); 1861 /* Set row_pointers, which is an array of pointers to scanlines for use 1862 by png_write_png(). */ 1863 extern PNG_EXPORT(void,png_set_rows) PNGARG((png_structp png_ptr, 1864 png_infop info_ptr, png_bytepp row_pointers)); 1865 #endif 1866 1867 /* Returns number of color channels in image. */ 1868 extern PNG_EXPORT(png_byte,png_get_channels) PNGARG((png_structp png_ptr, 1869 png_infop info_ptr)); 1870 1871 #ifdef PNG_EASY_ACCESS_SUPPORTED 1872 /* Returns image width in pixels. */ 1873 extern PNG_EXPORT(png_uint_32, png_get_image_width) PNGARG((png_structp 1874 png_ptr, png_infop info_ptr)); 1875 1876 /* Returns image height in pixels. */ 1877 extern PNG_EXPORT(png_uint_32, png_get_image_height) PNGARG((png_structp 1878 png_ptr, png_infop info_ptr)); 1879 1880 /* Returns image bit_depth. */ 1881 extern PNG_EXPORT(png_byte, png_get_bit_depth) PNGARG((png_structp 1882 png_ptr, png_infop info_ptr)); 1883 1884 /* Returns image color_type. */ 1885 extern PNG_EXPORT(png_byte, png_get_color_type) PNGARG((png_structp 1886 png_ptr, png_infop info_ptr)); 1887 1888 /* Returns image filter_type. */ 1889 extern PNG_EXPORT(png_byte, png_get_filter_type) PNGARG((png_structp 1890 png_ptr, png_infop info_ptr)); 1891 1892 /* Returns image interlace_type. */ 1893 extern PNG_EXPORT(png_byte, png_get_interlace_type) PNGARG((png_structp 1894 png_ptr, png_infop info_ptr)); 1895 1896 /* Returns image compression_type. */ 1897 extern PNG_EXPORT(png_byte, png_get_compression_type) PNGARG((png_structp 1898 png_ptr, png_infop info_ptr)); 1899 1900 /* Returns image resolution in pixels per meter, from pHYs chunk data. */ 1901 extern PNG_EXPORT(png_uint_32, png_get_pixels_per_meter) PNGARG((png_structp 1902 png_ptr, png_infop info_ptr)); 1903 extern PNG_EXPORT(png_uint_32, png_get_x_pixels_per_meter) PNGARG((png_structp 1904 png_ptr, png_infop info_ptr)); 1905 extern PNG_EXPORT(png_uint_32, png_get_y_pixels_per_meter) PNGARG((png_structp 1906 png_ptr, png_infop info_ptr)); 1907 1908 /* Returns pixel aspect ratio, computed from pHYs chunk data. */ 1909 #ifdef PNG_FLOATING_POINT_SUPPORTED 1910 extern PNG_EXPORT(float, png_get_pixel_aspect_ratio) PNGARG((png_structp 1911 png_ptr, png_infop info_ptr)); 1912 #endif 1913 1914 /* Returns image x, y offset in pixels or microns, from oFFs chunk data. */ 1915 extern PNG_EXPORT(png_int_32, png_get_x_offset_pixels) PNGARG((png_structp 1916 png_ptr, png_infop info_ptr)); 1917 extern PNG_EXPORT(png_int_32, png_get_y_offset_pixels) PNGARG((png_structp 1918 png_ptr, png_infop info_ptr)); 1919 extern PNG_EXPORT(png_int_32, png_get_x_offset_microns) PNGARG((png_structp 1920 png_ptr, png_infop info_ptr)); 1921 extern PNG_EXPORT(png_int_32, png_get_y_offset_microns) PNGARG((png_structp 1922 png_ptr, png_infop info_ptr)); 1923 1924 #endif /* PNG_EASY_ACCESS_SUPPORTED */ 1925 1926 /* Returns pointer to signature string read from PNG header */ 1927 extern PNG_EXPORT(png_bytep,png_get_signature) PNGARG((png_structp png_ptr, 1928 png_infop info_ptr)); 1929 1930 #if defined(PNG_bKGD_SUPPORTED) 1931 extern PNG_EXPORT(png_uint_32,png_get_bKGD) PNGARG((png_structp png_ptr, 1932 png_infop info_ptr, png_color_16p *background)); 1933 #endif 1934 1935 #if defined(PNG_bKGD_SUPPORTED) 1936 extern PNG_EXPORT(void,png_set_bKGD) PNGARG((png_structp png_ptr, 1937 png_infop info_ptr, png_color_16p background)); 1938 #endif 1939 1940 #if defined(PNG_cHRM_SUPPORTED) 1941 #ifdef PNG_FLOATING_POINT_SUPPORTED 1942 extern PNG_EXPORT(png_uint_32,png_get_cHRM) PNGARG((png_structp png_ptr, 1943 png_infop info_ptr, double *white_x, double *white_y, double *red_x, 1944 double *red_y, double *green_x, double *green_y, double *blue_x, 1945 double *blue_y)); 1946 #endif 1947 #ifdef PNG_FIXED_POINT_SUPPORTED 1948 extern PNG_EXPORT(png_uint_32,png_get_cHRM_fixed) PNGARG((png_structp png_ptr, 1949 png_infop info_ptr, png_fixed_point *int_white_x, png_fixed_point 1950 *int_white_y, png_fixed_point *int_red_x, png_fixed_point *int_red_y, 1951 png_fixed_point *int_green_x, png_fixed_point *int_green_y, png_fixed_point 1952 *int_blue_x, png_fixed_point *int_blue_y)); 1953 #endif 1954 #endif 1955 1956 #if defined(PNG_cHRM_SUPPORTED) 1957 #ifdef PNG_FLOATING_POINT_SUPPORTED 1958 extern PNG_EXPORT(void,png_set_cHRM) PNGARG((png_structp png_ptr, 1959 png_infop info_ptr, double white_x, double white_y, double red_x, 1960 double red_y, double green_x, double green_y, double blue_x, double blue_y)); 1961 #endif 1962 #ifdef PNG_FIXED_POINT_SUPPORTED 1963 extern PNG_EXPORT(void,png_set_cHRM_fixed) PNGARG((png_structp png_ptr, 1964 png_infop info_ptr, png_fixed_point int_white_x, png_fixed_point int_white_y, 1965 png_fixed_point int_red_x, png_fixed_point int_red_y, png_fixed_point 1966 int_green_x, png_fixed_point int_green_y, png_fixed_point int_blue_x, 1967 png_fixed_point int_blue_y)); 1968 #endif 1969 #endif 1970 1971 #if defined(PNG_gAMA_SUPPORTED) 1972 #ifdef PNG_FLOATING_POINT_SUPPORTED 1973 extern PNG_EXPORT(png_uint_32,png_get_gAMA) PNGARG((png_structp png_ptr, 1974 png_infop info_ptr, double *file_gamma)); 1975 #endif 1976 extern PNG_EXPORT(png_uint_32,png_get_gAMA_fixed) PNGARG((png_structp png_ptr, 1977 png_infop info_ptr, png_fixed_point *int_file_gamma)); 1978 #endif 1979 1980 #if defined(PNG_gAMA_SUPPORTED) 1981 #ifdef PNG_FLOATING_POINT_SUPPORTED 1982 extern PNG_EXPORT(void,png_set_gAMA) PNGARG((png_structp png_ptr, 1983 png_infop info_ptr, double file_gamma)); 1984 #endif 1985 extern PNG_EXPORT(void,png_set_gAMA_fixed) PNGARG((png_structp png_ptr, 1986 png_infop info_ptr, png_fixed_point int_file_gamma)); 1987 #endif 1988 1989 #if defined(PNG_hIST_SUPPORTED) 1990 extern PNG_EXPORT(png_uint_32,png_get_hIST) PNGARG((png_structp png_ptr, 1991 png_infop info_ptr, png_uint_16p *hist)); 1992 #endif 1993 1994 #if defined(PNG_hIST_SUPPORTED) 1995 extern PNG_EXPORT(void,png_set_hIST) PNGARG((png_structp png_ptr, 1996 png_infop info_ptr, png_uint_16p hist)); 1997 #endif 1998 1999 extern PNG_EXPORT(png_uint_32,png_get_IHDR) PNGARG((png_structp png_ptr, 2000 png_infop info_ptr, png_uint_32 *width, png_uint_32 *height, 2001 int *bit_depth, int *color_type, int *interlace_method, 2002 int *compression_method, int *filter_method)); 2003 2004 extern PNG_EXPORT(void,png_set_IHDR) PNGARG((png_structp png_ptr, 2005 png_infop info_ptr, png_uint_32 width, png_uint_32 height, int bit_depth, 2006 int color_type, int interlace_method, int compression_method, 2007 int filter_method)); 2008 2009 #if defined(PNG_oFFs_SUPPORTED) 2010 extern PNG_EXPORT(png_uint_32,png_get_oFFs) PNGARG((png_structp png_ptr, 2011 png_infop info_ptr, png_int_32 *offset_x, png_int_32 *offset_y, 2012 int *unit_type)); 2013 #endif 2014 2015 #if defined(PNG_oFFs_SUPPORTED) 2016 extern PNG_EXPORT(void,png_set_oFFs) PNGARG((png_structp png_ptr, 2017 png_infop info_ptr, png_int_32 offset_x, png_int_32 offset_y, 2018 int unit_type)); 2019 #endif 2020 2021 #if defined(PNG_pCAL_SUPPORTED) 2022 extern PNG_EXPORT(png_uint_32,png_get_pCAL) PNGARG((png_structp png_ptr, 2023 png_infop info_ptr, png_charp *purpose, png_int_32 *X0, png_int_32 *X1, 2024 int *type, int *nparams, png_charp *units, png_charpp *params)); 2025 #endif 2026 2027 #if defined(PNG_pCAL_SUPPORTED) 2028 extern PNG_EXPORT(void,png_set_pCAL) PNGARG((png_structp png_ptr, 2029 png_infop info_ptr, png_charp purpose, png_int_32 X0, png_int_32 X1, 2030 int type, int nparams, png_charp units, png_charpp params)); 2031 #endif 2032 2033 #if defined(PNG_pHYs_SUPPORTED) 2034 extern PNG_EXPORT(png_uint_32,png_get_pHYs) PNGARG((png_structp png_ptr, 2035 png_infop info_ptr, png_uint_32 *res_x, png_uint_32 *res_y, int *unit_type)); 2036 #endif 2037 2038 #if defined(PNG_pHYs_SUPPORTED) 2039 extern PNG_EXPORT(void,png_set_pHYs) PNGARG((png_structp png_ptr, 2040 png_infop info_ptr, png_uint_32 res_x, png_uint_32 res_y, int unit_type)); 2041 #endif 2042 2043 extern PNG_EXPORT(png_uint_32,png_get_PLTE) PNGARG((png_structp png_ptr, 2044 png_infop info_ptr, png_colorp *palette, int *num_palette)); 2045 2046 extern PNG_EXPORT(void,png_set_PLTE) PNGARG((png_structp png_ptr, 2047 png_infop info_ptr, png_colorp palette, int num_palette)); 2048 2049 #if defined(PNG_sBIT_SUPPORTED) 2050 extern PNG_EXPORT(png_uint_32,png_get_sBIT) PNGARG((png_structp png_ptr, 2051 png_infop info_ptr, png_color_8p *sig_bit)); 2052 #endif 2053 2054 #if defined(PNG_sBIT_SUPPORTED) 2055 extern PNG_EXPORT(void,png_set_sBIT) PNGARG((png_structp png_ptr, 2056 png_infop info_ptr, png_color_8p sig_bit)); 2057 #endif 2058 2059 #if defined(PNG_sRGB_SUPPORTED) 2060 extern PNG_EXPORT(png_uint_32,png_get_sRGB) PNGARG((png_structp png_ptr, 2061 png_infop info_ptr, int *intent)); 2062 #endif 2063 2064 #if defined(PNG_sRGB_SUPPORTED) 2065 extern PNG_EXPORT(void,png_set_sRGB) PNGARG((png_structp png_ptr, 2066 png_infop info_ptr, int intent)); 2067 extern PNG_EXPORT(void,png_set_sRGB_gAMA_and_cHRM) PNGARG((png_structp png_ptr, 2068 png_infop info_ptr, int intent)); 2069 #endif 2070 2071 #if defined(PNG_iCCP_SUPPORTED) 2072 extern PNG_EXPORT(png_uint_32,png_get_iCCP) PNGARG((png_structp png_ptr, 2073 png_infop info_ptr, png_charpp name, int *compression_type, 2074 png_charpp profile, png_uint_32 *proflen)); 2075 /* Note to maintainer: profile should be png_bytepp */ 2076 #endif 2077 2078 #if defined(PNG_iCCP_SUPPORTED) 2079 extern PNG_EXPORT(void,png_set_iCCP) PNGARG((png_structp png_ptr, 2080 png_infop info_ptr, png_charp name, int compression_type, 2081 png_charp profile, png_uint_32 proflen)); 2082 /* Note to maintainer: profile should be png_bytep */ 2083 #endif 2084 2085 #if defined(PNG_sPLT_SUPPORTED) 2086 extern PNG_EXPORT(png_uint_32,png_get_sPLT) PNGARG((png_structp png_ptr, 2087 png_infop info_ptr, png_sPLT_tpp entries)); 2088 #endif 2089 2090 #if defined(PNG_sPLT_SUPPORTED) 2091 extern PNG_EXPORT(void,png_set_sPLT) PNGARG((png_structp png_ptr, 2092 png_infop info_ptr, png_sPLT_tp entries, int nentries)); 2093 #endif 2094 2095 #if defined(PNG_TEXT_SUPPORTED) 2096 /* png_get_text also returns the number of text chunks in *num_text */ 2097 extern PNG_EXPORT(png_uint_32,png_get_text) PNGARG((png_structp png_ptr, 2098 png_infop info_ptr, png_textp *text_ptr, int *num_text)); 2099 #endif 2100 2101 /* 2102 * Note while png_set_text() will accept a structure whose text, 2103 * language, and translated keywords are NULL pointers, the structure 2104 * returned by png_get_text will always contain regular 2105 * zero-terminated C strings. They might be empty strings but 2106 * they will never be NULL pointers. 2107 */ 2108 2109 #if defined(PNG_TEXT_SUPPORTED) 2110 extern PNG_EXPORT(void,png_set_text) PNGARG((png_structp png_ptr, 2111 png_infop info_ptr, png_textp text_ptr, int num_text)); 2112 #endif 2113 2114 #if defined(PNG_tIME_SUPPORTED) 2115 extern PNG_EXPORT(png_uint_32,png_get_tIME) PNGARG((png_structp png_ptr, 2116 png_infop info_ptr, png_timep *mod_time)); 2117 #endif 2118 2119 #if defined(PNG_tIME_SUPPORTED) 2120 extern PNG_EXPORT(void,png_set_tIME) PNGARG((png_structp png_ptr, 2121 png_infop info_ptr, png_timep mod_time)); 2122 #endif 2123 2124 #if defined(PNG_tRNS_SUPPORTED) 2125 extern PNG_EXPORT(png_uint_32,png_get_tRNS) PNGARG((png_structp png_ptr, 2126 png_infop info_ptr, png_bytep *trans, int *num_trans, 2127 png_color_16p *trans_values)); 2128 #endif 2129 2130 #if defined(PNG_tRNS_SUPPORTED) 2131 extern PNG_EXPORT(void,png_set_tRNS) PNGARG((png_structp png_ptr, 2132 png_infop info_ptr, png_bytep trans, int num_trans, 2133 png_color_16p trans_values)); 2134 #endif 2135 2136 #if defined(PNG_tRNS_SUPPORTED) 2137 #endif 2138 2139 #if defined(PNG_sCAL_SUPPORTED) 2140 #ifdef PNG_FLOATING_POINT_SUPPORTED 2141 extern PNG_EXPORT(png_uint_32,png_get_sCAL) PNGARG((png_structp png_ptr, 2142 png_infop info_ptr, int *unit, double *width, double *height)); 2143 #else 2144 #ifdef PNG_FIXED_POINT_SUPPORTED 2145 extern PNG_EXPORT(png_uint_32,png_get_sCAL_s) PNGARG((png_structp png_ptr, 2146 png_infop info_ptr, int *unit, png_charpp swidth, png_charpp sheight)); 2147 #endif 2148 #endif 2149 #endif /* PNG_sCAL_SUPPORTED */ 2150 2151 #if defined(PNG_sCAL_SUPPORTED) 2152 #ifdef PNG_FLOATING_POINT_SUPPORTED 2153 extern PNG_EXPORT(void,png_set_sCAL) PNGARG((png_structp png_ptr, 2154 png_infop info_ptr, int unit, double width, double height)); 2155 #endif 2156 #ifdef PNG_FIXED_POINT_SUPPORTED 2157 extern PNG_EXPORT(void,png_set_sCAL_s) PNGARG((png_structp png_ptr, 2158 png_infop info_ptr, int unit, png_charp swidth, png_charp sheight)); 2159 #endif 2160 #endif /* PNG_sCAL_SUPPORTED || PNG_WRITE_sCAL_SUPPORTED */ 2161 2162 #if defined(PNG_UNKNOWN_CHUNKS_SUPPORTED) 2163 /* provide a list of chunks and how they are to be handled, if the built-in 2164 handling or default unknown chunk handling is not desired. Any chunks not 2165 listed will be handled in the default manner. The IHDR and IEND chunks 2166 must not be listed. 2167 keep = 0: follow default behavour 2168 = 1: do not keep 2169 = 2: keep only if safe-to-copy 2170 = 3: keep even if unsafe-to-copy 2171 */ 2172 extern PNG_EXPORT(void, png_set_keep_unknown_chunks) PNGARG((png_structp 2173 png_ptr, int keep, png_bytep chunk_list, int num_chunks)); 2174 extern PNG_EXPORT(void, png_set_unknown_chunks) PNGARG((png_structp png_ptr, 2175 png_infop info_ptr, png_unknown_chunkp unknowns, int num_unknowns)); 2176 extern PNG_EXPORT(void, png_set_unknown_chunk_location) 2177 PNGARG((png_structp png_ptr, png_infop info_ptr, int chunk, int location)); 2178 extern PNG_EXPORT(png_uint_32,png_get_unknown_chunks) PNGARG((png_structp 2179 png_ptr, png_infop info_ptr, png_unknown_chunkpp entries)); 2180 #endif 2181 2182 /* Png_free_data() will turn off the "valid" flag for anything it frees. 2183 If you need to turn it off for a chunk that your application has freed, 2184 you can use png_set_invalid(png_ptr, info_ptr, PNG_INFO_CHNK); */ 2185 extern PNG_EXPORT(void, png_set_invalid) PNGARG((png_structp png_ptr, 2186 png_infop info_ptr, int mask)); 2187 2188 #if defined(PNG_INFO_IMAGE_SUPPORTED) 2189 /* The "params" pointer is currently not used and is for future expansion. */ 2190 extern PNG_EXPORT(void, png_read_png) PNGARG((png_structp png_ptr, 2191 png_infop info_ptr, 2192 int transforms, 2193 png_voidp params)); 2194 extern PNG_EXPORT(void, png_write_png) PNGARG((png_structp png_ptr, 2195 png_infop info_ptr, 2196 int transforms, 2197 png_voidp params)); 2198 #endif 2199 2200 /* Define PNG_DEBUG at compile time for debugging information. Higher 2201 * numbers for PNG_DEBUG mean more debugging information. This has 2202 * only been added since version 0.95 so it is not implemented throughout 2203 * libpng yet, but more support will be added as needed. 2204 */ 2205 #ifdef PNG_DEBUG 2206 #if (PNG_DEBUG > 0) 2207 #if !defined(PNG_DEBUG_FILE) && defined(_MSC_VER) 2208 #include <crtdbg.h> 2209 #if (PNG_DEBUG > 1) 2210 #define png_debug(l,m) _RPT0(_CRT_WARN,m) 2211 #define png_debug1(l,m,p1) _RPT1(_CRT_WARN,m,p1) 2212 #define png_debug2(l,m,p1,p2) _RPT2(_CRT_WARN,m,p1,p2) 2213 #endif 2214 #else /* PNG_DEBUG_FILE || !_MSC_VER */ 2215 #ifndef PNG_DEBUG_FILE 2216 #define PNG_DEBUG_FILE stderr 2217 #endif /* PNG_DEBUG_FILE */ 2218 #if (PNG_DEBUG > 1) 2219 #define png_debug(l,m) \ 2220 { \ 2221 int num_tabs=l; \ 2222 fprintf(PNG_DEBUG_FILE,"%s"m,(num_tabs==1 ? "\t" : \ 2223 (num_tabs==2 ? "\t\t":(num_tabs>2 ? "\t\t\t":"")))); \ 2224 } 2225 #define png_debug1(l,m,p1) \ 2226 { \ 2227 int num_tabs=l; \ 2228 fprintf(PNG_DEBUG_FILE,"%s"m,(num_tabs==1 ? "\t" : \ 2229 (num_tabs==2 ? "\t\t":(num_tabs>2 ? "\t\t\t":""))),p1); \ 2230 } 2231 #define png_debug2(l,m,p1,p2) \ 2232 { \ 2233 int num_tabs=l; \ 2234 fprintf(PNG_DEBUG_FILE,"%s"m,(num_tabs==1 ? "\t" : \ 2235 (num_tabs==2 ? "\t\t":(num_tabs>2 ? "\t\t\t":""))),p1,p2); \ 2236 } 2237 #endif /* (PNG_DEBUG > 1) */ 2238 #endif /* _MSC_VER */ 2239 #endif /* (PNG_DEBUG > 0) */ 2240 #endif /* PNG_DEBUG */ 2241 #ifndef png_debug 2242 #define png_debug(l, m) 2243 #endif 2244 #ifndef png_debug1 2245 #define png_debug1(l, m, p1) 2246 #endif 2247 #ifndef png_debug2 2248 #define png_debug2(l, m, p1, p2) 2249 #endif 2250 2251 extern PNG_EXPORT(png_bytep,png_sig_bytes) PNGARG((void)); 2252 2253 extern PNG_EXPORT(png_charp,png_get_copyright) PNGARG((png_structp png_ptr)); 2254 extern PNG_EXPORT(png_charp,png_get_header_ver) PNGARG((png_structp png_ptr)); 2255 extern PNG_EXPORT(png_charp,png_get_header_version) PNGARG((png_structp png_ptr)); 2256 extern PNG_EXPORT(png_charp,png_get_libpng_ver) PNGARG((png_structp png_ptr)); 2257 2258 #ifdef PNG_MNG_FEATURES_SUPPORTED 2259 extern PNG_EXPORT(png_uint_32,png_permit_mng_features) PNGARG((png_structp 2260 png_ptr, png_uint_32 mng_features_permitted)); 2261 #endif 2262 2263 /* Added to version 1.2.0 */ 2264 #if defined(PNG_ASSEMBLER_CODE_SUPPORTED) 2265 #define PNG_ASM_FLAG_MMX_SUPPORT_COMPILED 0x01 /* not user-settable */ 2266 #define PNG_ASM_FLAG_MMX_SUPPORT_IN_CPU 0x02 /* not user-settable */ 2267 #define PNG_ASM_FLAG_MMX_READ_COMBINE_ROW 0x04 2268 #define PNG_ASM_FLAG_MMX_READ_INTERLACE 0x08 2269 #define PNG_ASM_FLAG_MMX_READ_FILTER_SUB 0x10 2270 #define PNG_ASM_FLAG_MMX_READ_FILTER_UP 0x20 2271 #define PNG_ASM_FLAG_MMX_READ_FILTER_AVG 0x40 2272 #define PNG_ASM_FLAG_MMX_READ_FILTER_PAETH 0x80 2273 #define PNG_ASM_FLAGS_INITIALIZED 0x80000000 /* not user-settable */ 2274 2275 #define PNG_MMX_READ_FLAGS ( PNG_ASM_FLAG_MMX_READ_COMBINE_ROW \ 2276 | PNG_ASM_FLAG_MMX_READ_INTERLACE \ 2277 | PNG_ASM_FLAG_MMX_READ_FILTER_SUB \ 2278 | PNG_ASM_FLAG_MMX_READ_FILTER_UP \ 2279 | PNG_ASM_FLAG_MMX_READ_FILTER_AVG \ 2280 | PNG_ASM_FLAG_MMX_READ_FILTER_PAETH ) 2281 #define PNG_MMX_WRITE_FLAGS ( 0 ) 2282 2283 #define PNG_MMX_FLAGS ( PNG_ASM_FLAG_MMX_SUPPORT_COMPILED \ 2284 | PNG_ASM_FLAG_MMX_SUPPORT_IN_CPU \ 2285 | PNG_MMX_READ_FLAGS \ 2286 | PNG_MMX_WRITE_FLAGS ) 2287 2288 #define PNG_SELECT_READ 1 2289 #define PNG_SELECT_WRITE 2 2290 2291 2292 /* pngget.c */ 2293 extern PNG_EXPORT(png_uint_32,png_get_mmx_flagmask) 2294 PNGARG((int flag_select, int *compilerID)); 2295 2296 /* pngget.c */ 2297 extern PNG_EXPORT(png_uint_32,png_get_asm_flagmask) 2298 PNGARG((int flag_select)); 2299 2300 /* pngget.c */ 2301 extern PNG_EXPORT(png_uint_32,png_get_asm_flags) 2302 PNGARG((png_structp png_ptr)); 2303 2304 /* pngget.c */ 2305 extern PNG_EXPORT(png_byte,png_get_mmx_bitdepth_threshold) 2306 PNGARG((png_structp png_ptr)); 2307 2308 /* pngget.c */ 2309 extern PNG_EXPORT(png_uint_32,png_get_mmx_rowbytes_threshold) 2310 PNGARG((png_structp png_ptr)); 2311 2312 /* pngset.c */ 2313 extern PNG_EXPORT(void,png_set_asm_flags) 2314 PNGARG((png_structp png_ptr, png_uint_32 asm_flags)); 2315 2316 /* pngset.c */ 2317 extern PNG_EXPORT(void,png_set_mmx_thresholds) 2318 PNGARG((png_structp png_ptr, png_byte mmx_bitdepth_threshold, 2319 png_uint_32 mmx_rowbytes_threshold)); 2320 2321 #endif /* PNG_ASSEMBLER_CODE_SUPPORTED */ 2322 2323 /* png.c, pnggccrd.c, or pngvcrd.c */ 2324 extern PNG_EXPORT(int,png_mmx_support) PNGARG((void)); 2325 2326 /* Strip the prepended error numbers ("#nnn ") from error and warning 2327 * messages before passing them to the error or warning handler. */ 2328 #ifdef PNG_ERROR_NUMBERS_SUPPORTED 2329 extern PNG_EXPORT(void,png_set_strip_error_numbers) PNGARG((png_structp 2330 png_ptr, png_uint_32 strip_mode)); 2331 #endif 2332 2333 /* Maintainer: Put new public prototypes here ^, in libpng.3, and project defs */ 2334 2335 #define PNG_HEADER_VERSION_STRING \ 2336 " libpng version 1.2.0 - September 1, 2001 (header)\n" 2337 2338 #ifdef PNG_READ_COMPOSITE_NODIV_SUPPORTED 2339 /* With these routines we avoid an integer divide, which will be slower on 2340 * most machines. However, it does take more operations than the corresponding 2341 * divide method, so it may be slower on a few RISC systems. There are two 2342 * shifts (by 8 or 16 bits) and an addition, versus a single integer divide. 2343 * 2344 * Note that the rounding factors are NOT supposed to be the same! 128 and 2345 * 32768 are correct for the NODIV code; 127 and 32767 are correct for the 2346 * standard method. 2347 * 2348 * [Optimized code by Greg Roelofs and Mark Adler...blame us for bugs. :-) ] 2349 */ 2350 2351 /* fg and bg should be in `gamma 1.0' space; alpha is the opacity */ 2352 2353 # define png_composite(composite, fg, alpha, bg) \ 2354 { png_uint_16 temp = (png_uint_16)((png_uint_16)(fg) * (png_uint_16)(alpha) \ 2355 + (png_uint_16)(bg)*(png_uint_16)(255 - \ 2356 (png_uint_16)(alpha)) + (png_uint_16)128); \ 2357 (composite) = (png_byte)((temp + (temp >> 8)) >> 8); } 2358 2359 # define png_composite_16(composite, fg, alpha, bg) \ 2360 { png_uint_32 temp = (png_uint_32)((png_uint_32)(fg) * (png_uint_32)(alpha) \ 2361 + (png_uint_32)(bg)*(png_uint_32)(65535L - \ 2362 (png_uint_32)(alpha)) + (png_uint_32)32768L); \ 2363 (composite) = (png_uint_16)((temp + (temp >> 16)) >> 16); } 2364 2365 #else /* standard method using integer division */ 2366 2367 # define png_composite(composite, fg, alpha, bg) \ 2368 (composite) = (png_byte)(((png_uint_16)(fg) * (png_uint_16)(alpha) + \ 2369 (png_uint_16)(bg) * (png_uint_16)(255 - (png_uint_16)(alpha)) + \ 2370 (png_uint_16)127) / 255) 2371 2372 # define png_composite_16(composite, fg, alpha, bg) \ 2373 (composite) = (png_uint_16)(((png_uint_32)(fg) * (png_uint_32)(alpha) + \ 2374 (png_uint_32)(bg)*(png_uint_32)(65535L - (png_uint_32)(alpha)) + \ 2375 (png_uint_32)32767) / (png_uint_32)65535L) 2376 2377 #endif /* PNG_READ_COMPOSITE_NODIV_SUPPORTED */ 2378 2379 /* These next functions are used internally in the code. They generally 2380 * shouldn't be used unless you are writing code to add or replace some 2381 * functionality in libpng. More information about most functions can 2382 * be found in the files where the functions are located. 2383 */ 2384 2385 #if defined(PNG_INTERNAL) 2386 2387 /* Various modes of operation. Note that after an init, mode is set to 2388 * zero automatically when the structure is created. 2389 */ 2390 #define PNG_HAVE_IHDR 0x01 2391 #define PNG_HAVE_PLTE 0x02 2392 #define PNG_HAVE_IDAT 0x04 2393 #define PNG_AFTER_IDAT 0x08 2394 #define PNG_HAVE_IEND 0x10 2395 #define PNG_HAVE_gAMA 0x20 2396 #define PNG_HAVE_cHRM 0x40 2397 #define PNG_HAVE_sRGB 0x80 2398 #define PNG_HAVE_CHUNK_HEADER 0x100 2399 #define PNG_WROTE_tIME 0x200 2400 #define PNG_WROTE_INFO_BEFORE_PLTE 0x400 2401 #define PNG_BACKGROUND_IS_GRAY 0x800 2402 #define PNG_HAVE_PNG_SIGNATURE 0x1000 2403 2404 /* flags for the transformations the PNG library does on the image data */ 2405 #define PNG_BGR 0x0001 2406 #define PNG_INTERLACE 0x0002 2407 #define PNG_PACK 0x0004 2408 #define PNG_SHIFT 0x0008 2409 #define PNG_SWAP_BYTES 0x0010 2410 #define PNG_INVERT_MONO 0x0020 2411 #define PNG_DITHER 0x0040 2412 #define PNG_BACKGROUND 0x0080 2413 #define PNG_BACKGROUND_EXPAND 0x0100 2414 /* 0x0200 unused */ 2415 #define PNG_16_TO_8 0x0400 2416 #define PNG_RGBA 0x0800 2417 #define PNG_EXPAND 0x1000 2418 #define PNG_GAMMA 0x2000 2419 #define PNG_GRAY_TO_RGB 0x4000 2420 #define PNG_FILLER 0x8000L 2421 #define PNG_PACKSWAP 0x10000L 2422 #define PNG_SWAP_ALPHA 0x20000L 2423 #define PNG_STRIP_ALPHA 0x40000L 2424 #define PNG_INVERT_ALPHA 0x80000L 2425 #define PNG_USER_TRANSFORM 0x100000L 2426 #define PNG_RGB_TO_GRAY_ERR 0x200000L 2427 #define PNG_RGB_TO_GRAY_WARN 0x400000L 2428 #define PNG_RGB_TO_GRAY 0x600000L /* two bits, RGB_TO_GRAY_ERR|WARN */ 2429 2430 /* flags for png_create_struct */ 2431 #define PNG_STRUCT_PNG 0x0001 2432 #define PNG_STRUCT_INFO 0x0002 2433 2434 /* Scaling factor for filter heuristic weighting calculations */ 2435 #define PNG_WEIGHT_SHIFT 8 2436 #define PNG_WEIGHT_FACTOR (1<<(PNG_WEIGHT_SHIFT)) 2437 #define PNG_COST_SHIFT 3 2438 #define PNG_COST_FACTOR (1<<(PNG_COST_SHIFT)) 2439 2440 /* flags for the png_ptr->flags rather than declaring a byte for each one */ 2441 #define PNG_FLAG_ZLIB_CUSTOM_STRATEGY 0x0001 2442 #define PNG_FLAG_ZLIB_CUSTOM_LEVEL 0x0002 2443 #define PNG_FLAG_ZLIB_CUSTOM_MEM_LEVEL 0x0004 2444 #define PNG_FLAG_ZLIB_CUSTOM_WINDOW_BITS 0x0008 2445 #define PNG_FLAG_ZLIB_CUSTOM_METHOD 0x0010 2446 #define PNG_FLAG_ZLIB_FINISHED 0x0020 2447 #define PNG_FLAG_ROW_INIT 0x0040 2448 #define PNG_FLAG_FILLER_AFTER 0x0080 2449 #define PNG_FLAG_CRC_ANCILLARY_USE 0x0100 2450 #define PNG_FLAG_CRC_ANCILLARY_NOWARN 0x0200 2451 #define PNG_FLAG_CRC_CRITICAL_USE 0x0400 2452 #define PNG_FLAG_CRC_CRITICAL_IGNORE 0x0800 2453 #define PNG_FLAG_FREE_PLTE 0x1000 2454 #define PNG_FLAG_FREE_TRNS 0x2000 2455 #define PNG_FLAG_FREE_HIST 0x4000 2456 #define PNG_FLAG_KEEP_UNKNOWN_CHUNKS 0x8000L 2457 #define PNG_FLAG_KEEP_UNSAFE_CHUNKS 0x10000L 2458 #define PNG_FLAG_LIBRARY_MISMATCH 0x20000L 2459 #define PNG_FLAG_STRIP_ERROR_NUMBERS 0x40000L 2460 #define PNG_FLAG_STRIP_ERROR_TEXT 0x80000L 2461 2462 /* For use in png_set_keep_unknown, png_handle_as_unknown */ 2463 #define HANDLE_CHUNK_AS_DEFAULT 0 2464 #define HANDLE_CHUNK_NEVER 1 2465 #define HANDLE_CHUNK_IF_SAFE 2 2466 #define HANDLE_CHUNK_ALWAYS 3 2467 2468 #define PNG_FLAG_CRC_ANCILLARY_MASK (PNG_FLAG_CRC_ANCILLARY_USE | \ 2469 PNG_FLAG_CRC_ANCILLARY_NOWARN) 2470 2471 #define PNG_FLAG_CRC_CRITICAL_MASK (PNG_FLAG_CRC_CRITICAL_USE | \ 2472 PNG_FLAG_CRC_CRITICAL_IGNORE) 2473 2474 #define PNG_FLAG_CRC_MASK (PNG_FLAG_CRC_ANCILLARY_MASK | \ 2475 PNG_FLAG_CRC_CRITICAL_MASK) 2476 2477 /* save typing and make code easier to understand */ 2478 #define PNG_COLOR_DIST(c1, c2) (abs((int)((c1).red) - (int)((c2).red)) + \ 2479 abs((int)((c1).green) - (int)((c2).green)) + \ 2480 abs((int)((c1).blue) - (int)((c2).blue))) 2481 2482 /* variables declared in png.c - only it needs to define PNG_NO_EXTERN */ 2483 #if !defined(PNG_NO_EXTERN) || defined(PNG_ALWAYS_EXTERN) 2484 /* place to hold the signature string for a PNG file. */ 2485 #ifdef PNG_USE_GLOBAL_ARRAYS 2486 PNG_EXPORT_VAR (const png_byte FARDATA) png_sig[8]; 2487 #else 2488 #define png_sig png_sig_bytes(NULL) 2489 #endif 2490 #endif /* PNG_NO_EXTERN */ 2491 2492 /* Constant strings for known chunk types. If you need to add a chunk, 2493 * define the name here, and add an invocation of the macro in png.c and 2494 * wherever it's needed. 2495 */ 2496 #define PNG_IHDR const png_byte png_IHDR[5] = { 73, 72, 68, 82, '\0'} 2497 #define PNG_IDAT const png_byte png_IDAT[5] = { 73, 68, 65, 84, '\0'} 2498 #define PNG_IEND const png_byte png_IEND[5] = { 73, 69, 78, 68, '\0'} 2499 #define PNG_PLTE const png_byte png_PLTE[5] = { 80, 76, 84, 69, '\0'} 2500 #define PNG_bKGD const png_byte png_bKGD[5] = { 98, 75, 71, 68, '\0'} 2501 #define PNG_cHRM const png_byte png_cHRM[5] = { 99, 72, 82, 77, '\0'} 2502 #define PNG_gAMA const png_byte png_gAMA[5] = {103, 65, 77, 65, '\0'} 2503 #define PNG_hIST const png_byte png_hIST[5] = {104, 73, 83, 84, '\0'} 2504 #define PNG_iCCP const png_byte png_iCCP[5] = {105, 67, 67, 80, '\0'} 2505 #define PNG_iTXt const png_byte png_iTXt[5] = {105, 84, 88, 116, '\0'} 2506 #define PNG_oFFs const png_byte png_oFFs[5] = {111, 70, 70, 115, '\0'} 2507 #define PNG_pCAL const png_byte png_pCAL[5] = {112, 67, 65, 76, '\0'} 2508 #define PNG_sCAL const png_byte png_sCAL[5] = {115, 67, 65, 76, '\0'} 2509 #define PNG_pHYs const png_byte png_pHYs[5] = {112, 72, 89, 115, '\0'} 2510 #define PNG_sBIT const png_byte png_sBIT[5] = {115, 66, 73, 84, '\0'} 2511 #define PNG_sPLT const png_byte png_sPLT[5] = {115, 80, 76, 84, '\0'} 2512 #define PNG_sRGB const png_byte png_sRGB[5] = {115, 82, 71, 66, '\0'} 2513 #define PNG_tEXt const png_byte png_tEXt[5] = {116, 69, 88, 116, '\0'} 2514 #define PNG_tIME const png_byte png_tIME[5] = {116, 73, 77, 69, '\0'} 2515 #define PNG_tRNS const png_byte png_tRNS[5] = {116, 82, 78, 83, '\0'} 2516 #define PNG_zTXt const png_byte png_zTXt[5] = {122, 84, 88, 116, '\0'} 2517 2518 #ifdef PNG_USE_GLOBAL_ARRAYS 2519 PNG_EXPORT_VAR (const png_byte FARDATA) png_IHDR[5]; 2520 PNG_EXPORT_VAR (const png_byte FARDATA) png_IDAT[5]; 2521 PNG_EXPORT_VAR (const png_byte FARDATA) png_IEND[5]; 2522 PNG_EXPORT_VAR (const png_byte FARDATA) png_PLTE[5]; 2523 PNG_EXPORT_VAR (const png_byte FARDATA) png_bKGD[5]; 2524 PNG_EXPORT_VAR (const png_byte FARDATA) png_cHRM[5]; 2525 PNG_EXPORT_VAR (const png_byte FARDATA) png_gAMA[5]; 2526 PNG_EXPORT_VAR (const png_byte FARDATA) png_hIST[5]; 2527 PNG_EXPORT_VAR (const png_byte FARDATA) png_iCCP[5]; 2528 PNG_EXPORT_VAR (const png_byte FARDATA) png_iTXt[5]; 2529 PNG_EXPORT_VAR (const png_byte FARDATA) png_oFFs[5]; 2530 PNG_EXPORT_VAR (const png_byte FARDATA) png_pCAL[5]; 2531 PNG_EXPORT_VAR (const png_byte FARDATA) png_sCAL[5]; 2532 PNG_EXPORT_VAR (const png_byte FARDATA) png_pHYs[5]; 2533 PNG_EXPORT_VAR (const png_byte FARDATA) png_sBIT[5]; 2534 PNG_EXPORT_VAR (const png_byte FARDATA) png_sPLT[5]; 2535 PNG_EXPORT_VAR (const png_byte FARDATA) png_sRGB[5]; 2536 PNG_EXPORT_VAR (const png_byte FARDATA) png_tEXt[5]; 2537 PNG_EXPORT_VAR (const png_byte FARDATA) png_tIME[5]; 2538 PNG_EXPORT_VAR (const png_byte FARDATA) png_tRNS[5]; 2539 PNG_EXPORT_VAR (const png_byte FARDATA) png_zTXt[5]; 2540 #endif /* PNG_USE_GLOBAL_ARRAYS */ 2541 2542 2543 /* Inline macros to do direct reads of bytes from the input buffer. These 2544 * require that you are using an architecture that uses PNG byte ordering 2545 * (MSB first) and supports unaligned data storage. I think that PowerPC 2546 * in big-endian mode and 680x0 are the only ones that will support this. 2547 * The x86 line of processors definitely do not. The png_get_int_32() 2548 * routine also assumes we are using two's complement format for negative 2549 * values, which is almost certainly true. 2550 */ 2551 #if defined(PNG_READ_BIG_ENDIAN_SUPPORTED) 2552 # if defined(PNG_pCAL_SUPPORTED) || defined(PNG_oFFs_SUPPORTED) 2553 # define png_get_int_32(buf) ( *((png_int_32p) (buf))) 2554 # endif 2555 # define png_get_uint_32(buf) ( *((png_uint_32p) (buf))) 2556 # define png_get_uint_16(buf) ( *((png_uint_16p) (buf))) 2557 #else 2558 # if defined(PNG_pCAL_SUPPORTED) || defined(PNG_oFFs_SUPPORTED) 2559 PNG_EXTERN png_int_32 png_get_int_32 PNGARG((png_bytep buf)); 2560 # endif 2561 PNG_EXTERN png_uint_32 png_get_uint_32 PNGARG((png_bytep buf)); 2562 PNG_EXTERN png_uint_16 png_get_uint_16 PNGARG((png_bytep buf)); 2563 #endif /* !PNG_READ_BIG_ENDIAN_SUPPORTED */ 2564 2565 /* Initialize png_ptr struct for reading, and allocate any other memory. 2566 * (old interface - DEPRECATED - use png_create_read_struct instead). 2567 */ 2568 extern PNG_EXPORT(void,png_read_init) PNGARG((png_structp png_ptr)); 2569 #define png_read_init(png_ptr) png_read_init_3(&png_ptr, \ 2570 PNG_LIBPNG_VER_STRING, sizeof(png_struct)); 2571 extern PNG_EXPORT(void,png_read_init_3) PNGARG((png_structpp ptr_ptr, 2572 png_const_charp user_png_ver, png_size_t png_struct_size)); 2573 extern PNG_EXPORT(void,png_read_init_2) PNGARG((png_structp png_ptr, 2574 png_const_charp user_png_ver, png_size_t png_struct_size, png_size_t 2575 png_info_size)); 2576 2577 /* Initialize png_ptr struct for writing, and allocate any other memory. 2578 * (old interface - DEPRECATED - use png_create_write_struct instead). 2579 */ 2580 extern PNG_EXPORT(void,png_write_init) PNGARG((png_structp png_ptr)); 2581 #define png_write_init(png_ptr) png_write_init_3(&png_ptr, \ 2582 PNG_LIBPNG_VER_STRING, sizeof(png_struct)); 2583 extern PNG_EXPORT(void,png_write_init_3) PNGARG((png_structpp ptr_ptr, 2584 png_const_charp user_png_ver, png_size_t png_struct_size)); 2585 extern PNG_EXPORT(void,png_write_init_2) PNGARG((png_structp png_ptr, 2586 png_const_charp user_png_ver, png_size_t png_struct_size, png_size_t 2587 png_info_size)); 2588 2589 /* Allocate memory for an internal libpng struct */ 2590 PNG_EXTERN png_voidp png_create_struct PNGARG((int type)); 2591 2592 /* Free memory from internal libpng struct */ 2593 PNG_EXTERN void png_destroy_struct PNGARG((png_voidp struct_ptr)); 2594 2595 PNG_EXTERN png_voidp png_create_struct_2 PNGARG((int type, png_malloc_ptr 2596 malloc_fn, png_voidp mem_ptr)); 2597 PNG_EXTERN void png_destroy_struct_2 PNGARG((png_voidp struct_ptr, 2598 png_free_ptr free_fn, png_voidp mem_ptr)); 2599 2600 /* Free any memory that info_ptr points to and reset struct. */ 2601 PNG_EXTERN void png_info_destroy PNGARG((png_structp png_ptr, 2602 png_infop info_ptr)); 2603 2604 /* Function to allocate memory for zlib. */ 2605 PNG_EXTERN voidpf png_zalloc PNGARG((voidpf png_ptr, uInt items, uInt size)); 2606 2607 /* Function to free memory for zlib */ 2608 PNG_EXTERN void png_zfree PNGARG((voidpf png_ptr, voidpf ptr)); 2609 2610 /* Reset the CRC variable */ 2611 PNG_EXTERN void png_reset_crc PNGARG((png_structp png_ptr)); 2612 2613 /* Write the "data" buffer to whatever output you are using. */ 2614 PNG_EXTERN void png_write_data PNGARG((png_structp png_ptr, png_bytep data, 2615 png_size_t length)); 2616 2617 /* Read data from whatever input you are using into the "data" buffer */ 2618 PNG_EXTERN void png_read_data PNGARG((png_structp png_ptr, png_bytep data, 2619 png_size_t length)); 2620 2621 /* Read bytes into buf, and update png_ptr->crc */ 2622 PNG_EXTERN void png_crc_read PNGARG((png_structp png_ptr, png_bytep buf, 2623 png_size_t length)); 2624 2625 /* Decompress data in a chunk that uses compression */ 2626 #if defined(PNG_zTXt_SUPPORTED) || defined(PNG_iTXt_SUPPORTED) || \ 2627 defined(PNG_iCCP_SUPPORTED) || defined(PNG_sPLT_SUPPORTED) 2628 PNG_EXTERN png_charp png_decompress_chunk PNGARG((png_structp png_ptr, 2629 int comp_type, png_charp chunkdata, png_size_t chunklength, 2630 png_size_t prefix_length, png_size_t *data_length)); 2631 #endif 2632 2633 /* Read "skip" bytes, read the file crc, and (optionally) verify png_ptr->crc */ 2634 PNG_EXTERN int png_crc_finish PNGARG((png_structp png_ptr, png_uint_32 skip)); 2635 2636 /* Read the CRC from the file and compare it to the libpng calculated CRC */ 2637 PNG_EXTERN int png_crc_error PNGARG((png_structp png_ptr)); 2638 2639 /* Calculate the CRC over a section of data. Note that we are only 2640 * passing a maximum of 64K on systems that have this as a memory limit, 2641 * since this is the maximum buffer size we can specify. 2642 */ 2643 PNG_EXTERN void png_calculate_crc PNGARG((png_structp png_ptr, png_bytep ptr, 2644 png_size_t length)); 2645 2646 #if defined(PNG_WRITE_FLUSH_SUPPORTED) 2647 PNG_EXTERN void png_flush PNGARG((png_structp png_ptr)); 2648 #endif 2649 2650 /* Place a 32-bit number into a buffer in PNG byte order (big-endian). 2651 * The only currently known PNG chunks that use signed numbers are 2652 * the ancillary extension chunks, oFFs and pCAL. 2653 */ 2654 PNG_EXTERN void png_save_uint_32 PNGARG((png_bytep buf, png_uint_32 i)); 2655 2656 #if defined(PNG_WRITE_pCAL_SUPPORTED) || defined(PNG_WRITE_oFFs_SUPPORTED) 2657 PNG_EXTERN void png_save_int_32 PNGARG((png_bytep buf, png_int_32 i)); 2658 #endif 2659 2660 /* Place a 16-bit number into a buffer in PNG byte order. 2661 * The parameter is declared unsigned int, not png_uint_16, 2662 * just to avoid potential problems on pre-ANSI C compilers. 2663 */ 2664 PNG_EXTERN void png_save_uint_16 PNGARG((png_bytep buf, unsigned int i)); 2665 2666 /* simple function to write the signature */ 2667 PNG_EXTERN void png_write_sig PNGARG((png_structp png_ptr)); 2668 2669 /* write various chunks */ 2670 2671 /* Write the IHDR chunk, and update the png_struct with the necessary 2672 * information. 2673 */ 2674 PNG_EXTERN void png_write_IHDR PNGARG((png_structp png_ptr, png_uint_32 width, 2675 png_uint_32 height, 2676 int bit_depth, int color_type, int compression_method, int filter_method, 2677 int interlace_method)); 2678 2679 PNG_EXTERN void png_write_PLTE PNGARG((png_structp png_ptr, png_colorp palette, 2680 png_uint_32 num_pal)); 2681 2682 PNG_EXTERN void png_write_IDAT PNGARG((png_structp png_ptr, png_bytep data, 2683 png_size_t length)); 2684 2685 PNG_EXTERN void png_write_IEND PNGARG((png_structp png_ptr)); 2686 2687 #if defined(PNG_WRITE_gAMA_SUPPORTED) 2688 #ifdef PNG_FLOATING_POINT_SUPPORTED 2689 PNG_EXTERN void png_write_gAMA PNGARG((png_structp png_ptr, double file_gamma)); 2690 #endif 2691 #ifdef PNG_FIXED_POINT_SUPPORTED 2692 PNG_EXTERN void png_write_gAMA_fixed PNGARG((png_structp png_ptr, png_fixed_point 2693 file_gamma)); 2694 #endif 2695 #endif 2696 2697 #if defined(PNG_WRITE_sBIT_SUPPORTED) 2698 PNG_EXTERN void png_write_sBIT PNGARG((png_structp png_ptr, png_color_8p sbit, 2699 int color_type)); 2700 #endif 2701 2702 #if defined(PNG_WRITE_cHRM_SUPPORTED) 2703 #ifdef PNG_FLOATING_POINT_SUPPORTED 2704 PNG_EXTERN void png_write_cHRM PNGARG((png_structp png_ptr, 2705 double white_x, double white_y, 2706 double red_x, double red_y, double green_x, double green_y, 2707 double blue_x, double blue_y)); 2708 #endif 2709 #ifdef PNG_FIXED_POINT_SUPPORTED 2710 PNG_EXTERN void png_write_cHRM_fixed PNGARG((png_structp png_ptr, 2711 png_fixed_point int_white_x, png_fixed_point int_white_y, 2712 png_fixed_point int_red_x, png_fixed_point int_red_y, png_fixed_point 2713 int_green_x, png_fixed_point int_green_y, png_fixed_point int_blue_x, 2714 png_fixed_point int_blue_y)); 2715 #endif 2716 #endif 2717 2718 #if defined(PNG_WRITE_sRGB_SUPPORTED) 2719 PNG_EXTERN void png_write_sRGB PNGARG((png_structp png_ptr, 2720 int intent)); 2721 #endif 2722 2723 #if defined(PNG_WRITE_iCCP_SUPPORTED) 2724 PNG_EXTERN void png_write_iCCP PNGARG((png_structp png_ptr, 2725 png_charp name, int compression_type, 2726 png_charp profile, int proflen)); 2727 /* Note to maintainer: profile should be png_bytep */ 2728 #endif 2729 2730 #if defined(PNG_WRITE_sPLT_SUPPORTED) 2731 PNG_EXTERN void png_write_sPLT PNGARG((png_structp png_ptr, 2732 png_sPLT_tp palette)); 2733 #endif 2734 2735 #if defined(PNG_WRITE_tRNS_SUPPORTED) 2736 PNG_EXTERN void png_write_tRNS PNGARG((png_structp png_ptr, png_bytep trans, 2737 png_color_16p values, int number, int color_type)); 2738 #endif 2739 2740 #if defined(PNG_WRITE_bKGD_SUPPORTED) 2741 PNG_EXTERN void png_write_bKGD PNGARG((png_structp png_ptr, 2742 png_color_16p values, int color_type)); 2743 #endif 2744 2745 #if defined(PNG_WRITE_hIST_SUPPORTED) 2746 PNG_EXTERN void png_write_hIST PNGARG((png_structp png_ptr, png_uint_16p hist, 2747 int num_hist)); 2748 #endif 2749 2750 #if defined(PNG_WRITE_TEXT_SUPPORTED) || defined(PNG_WRITE_pCAL_SUPPORTED) || \ 2751 defined(PNG_WRITE_iCCP_SUPPORTED) || defined(PNG_WRITE_sPLT_SUPPORTED) 2752 PNG_EXTERN png_size_t png_check_keyword PNGARG((png_structp png_ptr, 2753 png_charp key, png_charpp new_key)); 2754 #endif 2755 2756 #if defined(PNG_WRITE_tEXt_SUPPORTED) 2757 PNG_EXTERN void png_write_tEXt PNGARG((png_structp png_ptr, png_charp key, 2758 png_charp text, png_size_t text_len)); 2759 #endif 2760 2761 #if defined(PNG_WRITE_zTXt_SUPPORTED) 2762 PNG_EXTERN void png_write_zTXt PNGARG((png_structp png_ptr, png_charp key, 2763 png_charp text, png_size_t text_len, int compression)); 2764 #endif 2765 2766 #if defined(PNG_WRITE_iTXt_SUPPORTED) 2767 PNG_EXTERN void png_write_iTXt PNGARG((png_structp png_ptr, 2768 int compression, png_charp key, png_charp lang, png_charp lang_key, 2769 png_charp text)); 2770 #endif 2771 2772 #if defined(PNG_WRITE_oFFs_SUPPORTED) 2773 PNG_EXTERN void png_write_oFFs PNGARG((png_structp png_ptr, 2774 png_int_32 x_offset, png_int_32 y_offset, int unit_type)); 2775 #endif 2776 2777 #if defined(PNG_WRITE_pCAL_SUPPORTED) 2778 PNG_EXTERN void png_write_pCAL PNGARG((png_structp png_ptr, png_charp purpose, 2779 png_int_32 X0, png_int_32 X1, int type, int nparams, 2780 png_charp units, png_charpp params)); 2781 #endif 2782 2783 #if defined(PNG_WRITE_pHYs_SUPPORTED) 2784 PNG_EXTERN void png_write_pHYs PNGARG((png_structp png_ptr, 2785 png_uint_32 x_pixels_per_unit, png_uint_32 y_pixels_per_unit, 2786 int unit_type)); 2787 #endif 2788 2789 #if defined(PNG_WRITE_tIME_SUPPORTED) 2790 PNG_EXTERN void png_write_tIME PNGARG((png_structp png_ptr, 2791 png_timep mod_time)); 2792 #endif 2793 2794 #if defined(PNG_WRITE_sCAL_SUPPORTED) 2795 #if defined(PNG_FLOATING_POINT_SUPPORTED) && !defined(PNG_NO_STDIO) 2796 PNG_EXTERN void png_write_sCAL PNGARG((png_structp png_ptr, 2797 int unit, double width, double height)); 2798 #else 2799 #ifdef PNG_FIXED_POINT_SUPPORTED 2800 PNG_EXTERN void png_write_sCAL_s PNGARG((png_structp png_ptr, 2801 int unit, png_charp width, png_charp height)); 2802 #endif 2803 #endif 2804 #endif 2805 2806 /* Called when finished processing a row of data */ 2807 PNG_EXTERN void png_write_finish_row PNGARG((png_structp png_ptr)); 2808 2809 /* Internal use only. Called before first row of data */ 2810 PNG_EXTERN void png_write_start_row PNGARG((png_structp png_ptr)); 2811 2812 #if defined(PNG_READ_GAMMA_SUPPORTED) 2813 PNG_EXTERN void png_build_gamma_table PNGARG((png_structp png_ptr)); 2814 #endif 2815 2816 /* combine a row of data, dealing with alpha, etc. if requested */ 2817 PNG_EXTERN void png_combine_row PNGARG((png_structp png_ptr, png_bytep row, 2818 int mask)); 2819 2820 #if defined(PNG_READ_INTERLACING_SUPPORTED) 2821 /* expand an interlaced row */ 2822 /* OLD pre-1.0.9 interface: 2823 PNG_EXTERN void png_do_read_interlace PNGARG((png_row_infop row_info, 2824 png_bytep row, int pass, png_uint_32 transformations)); 2825 */ 2826 PNG_EXTERN void png_do_read_interlace PNGARG((png_structp png_ptr)); 2827 #endif 2828 2829 /* GRR TO DO (2.0 or whenever): simplify other internal calling interfaces */ 2830 2831 #if defined(PNG_WRITE_INTERLACING_SUPPORTED) 2832 /* grab pixels out of a row for an interlaced pass */ 2833 PNG_EXTERN void png_do_write_interlace PNGARG((png_row_infop row_info, 2834 png_bytep row, int pass)); 2835 #endif 2836 2837 /* unfilter a row */ 2838 PNG_EXTERN void png_read_filter_row PNGARG((png_structp png_ptr, 2839 png_row_infop row_info, png_bytep row, png_bytep prev_row, int filter)); 2840 2841 /* Choose the best filter to use and filter the row data */ 2842 PNG_EXTERN void png_write_find_filter PNGARG((png_structp png_ptr, 2843 png_row_infop row_info)); 2844 2845 /* Write out the filtered row. */ 2846 PNG_EXTERN void png_write_filtered_row PNGARG((png_structp png_ptr, 2847 png_bytep filtered_row)); 2848 /* finish a row while reading, dealing with interlacing passes, etc. */ 2849 PNG_EXTERN void png_read_finish_row PNGARG((png_structp png_ptr)); 2850 2851 /* initialize the row buffers, etc. */ 2852 PNG_EXTERN void png_read_start_row PNGARG((png_structp png_ptr)); 2853 /* optional call to update the users info structure */ 2854 PNG_EXTERN void png_read_transform_info PNGARG((png_structp png_ptr, 2855 png_infop info_ptr)); 2856 2857 /* these are the functions that do the transformations */ 2858 #if defined(PNG_READ_FILLER_SUPPORTED) 2859 PNG_EXTERN void png_do_read_filler PNGARG((png_row_infop row_info, 2860 png_bytep row, png_uint_32 filler, png_uint_32 flags)); 2861 #endif 2862 2863 #if defined(PNG_READ_SWAP_ALPHA_SUPPORTED) 2864 PNG_EXTERN void png_do_read_swap_alpha PNGARG((png_row_infop row_info, 2865 png_bytep row)); 2866 #endif 2867 2868 #if defined(PNG_WRITE_SWAP_ALPHA_SUPPORTED) 2869 PNG_EXTERN void png_do_write_swap_alpha PNGARG((png_row_infop row_info, 2870 png_bytep row)); 2871 #endif 2872 2873 #if defined(PNG_READ_INVERT_ALPHA_SUPPORTED) 2874 PNG_EXTERN void png_do_read_invert_alpha PNGARG((png_row_infop row_info, 2875 png_bytep row)); 2876 #endif 2877 2878 #if defined(PNG_WRITE_INVERT_ALPHA_SUPPORTED) 2879 PNG_EXTERN void png_do_write_invert_alpha PNGARG((png_row_infop row_info, 2880 png_bytep row)); 2881 #endif 2882 2883 #if defined(PNG_WRITE_FILLER_SUPPORTED) || \ 2884 defined(PNG_READ_STRIP_ALPHA_SUPPORTED) 2885 PNG_EXTERN void png_do_strip_filler PNGARG((png_row_infop row_info, 2886 png_bytep row, png_uint_32 flags)); 2887 #endif 2888 2889 #if defined(PNG_READ_SWAP_SUPPORTED) || defined(PNG_WRITE_SWAP_SUPPORTED) 2890 PNG_EXTERN void png_do_swap PNGARG((png_row_infop row_info, png_bytep row)); 2891 #endif 2892 2893 #if defined(PNG_READ_PACKSWAP_SUPPORTED) || defined(PNG_WRITE_PACKSWAP_SUPPORTED) 2894 PNG_EXTERN void png_do_packswap PNGARG((png_row_infop row_info, png_bytep row)); 2895 #endif 2896 2897 #if defined(PNG_READ_RGB_TO_GRAY_SUPPORTED) 2898 PNG_EXTERN int png_do_rgb_to_gray PNGARG((png_structp png_ptr, png_row_infop 2899 row_info, png_bytep row)); 2900 #endif 2901 2902 #if defined(PNG_READ_GRAY_TO_RGB_SUPPORTED) 2903 PNG_EXTERN void png_do_gray_to_rgb PNGARG((png_row_infop row_info, 2904 png_bytep row)); 2905 #endif 2906 2907 #if defined(PNG_READ_PACK_SUPPORTED) 2908 PNG_EXTERN void png_do_unpack PNGARG((png_row_infop row_info, png_bytep row)); 2909 #endif 2910 2911 #if defined(PNG_READ_SHIFT_SUPPORTED) 2912 PNG_EXTERN void png_do_unshift PNGARG((png_row_infop row_info, png_bytep row, 2913 png_color_8p sig_bits)); 2914 #endif 2915 2916 #if defined(PNG_READ_INVERT_SUPPORTED) || defined(PNG_WRITE_INVERT_SUPPORTED) 2917 PNG_EXTERN void png_do_invert PNGARG((png_row_infop row_info, png_bytep row)); 2918 #endif 2919 2920 #if defined(PNG_READ_16_TO_8_SUPPORTED) 2921 PNG_EXTERN void png_do_chop PNGARG((png_row_infop row_info, png_bytep row)); 2922 #endif 2923 2924 #if defined(PNG_READ_DITHER_SUPPORTED) 2925 PNG_EXTERN void png_do_dither PNGARG((png_row_infop row_info, 2926 png_bytep row, png_bytep palette_lookup, png_bytep dither_lookup)); 2927 2928 # if defined(PNG_CORRECT_PALETTE_SUPPORTED) 2929 PNG_EXTERN void png_correct_palette PNGARG((png_structp png_ptr, 2930 png_colorp palette, int num_palette)); 2931 # endif 2932 #endif 2933 2934 #if defined(PNG_READ_BGR_SUPPORTED) || defined(PNG_WRITE_BGR_SUPPORTED) 2935 PNG_EXTERN void png_do_bgr PNGARG((png_row_infop row_info, png_bytep row)); 2936 #endif 2937 2938 #if defined(PNG_WRITE_PACK_SUPPORTED) 2939 PNG_EXTERN void png_do_pack PNGARG((png_row_infop row_info, 2940 png_bytep row, png_uint_32 bit_depth)); 2941 #endif 2942 2943 #if defined(PNG_WRITE_SHIFT_SUPPORTED) 2944 PNG_EXTERN void png_do_shift PNGARG((png_row_infop row_info, png_bytep row, 2945 png_color_8p bit_depth)); 2946 #endif 2947 2948 #if defined(PNG_READ_BACKGROUND_SUPPORTED) 2949 PNG_EXTERN void png_do_background PNGARG((png_row_infop row_info, png_bytep row, 2950 png_color_16p trans_values, png_color_16p background, 2951 png_color_16p background_1, 2952 png_bytep gamma_table, png_bytep gamma_from_1, png_bytep gamma_to_1, 2953 png_uint_16pp gamma_16, png_uint_16pp gamma_16_from_1, 2954 png_uint_16pp gamma_16_to_1, int gamma_shift)); 2955 #endif 2956 2957 #if defined(PNG_READ_GAMMA_SUPPORTED) 2958 PNG_EXTERN void png_do_gamma PNGARG((png_row_infop row_info, png_bytep row, 2959 png_bytep gamma_table, png_uint_16pp gamma_16_table, 2960 int gamma_shift)); 2961 #endif 2962 2963 #if defined(PNG_READ_EXPAND_SUPPORTED) 2964 PNG_EXTERN void png_do_expand_palette PNGARG((png_row_infop row_info, 2965 png_bytep row, png_colorp palette, png_bytep trans, int num_trans)); 2966 PNG_EXTERN void png_do_expand PNGARG((png_row_infop row_info, 2967 png_bytep row, png_color_16p trans_value)); 2968 #endif 2969 2970 /* The following decodes the appropriate chunks, and does error correction, 2971 * then calls the appropriate callback for the chunk if it is valid. 2972 */ 2973 2974 /* decode the IHDR chunk */ 2975 PNG_EXTERN void png_handle_IHDR PNGARG((png_structp png_ptr, png_infop info_ptr, 2976 png_uint_32 length)); 2977 PNG_EXTERN void png_handle_PLTE PNGARG((png_structp png_ptr, png_infop info_ptr, 2978 png_uint_32 length)); 2979 PNG_EXTERN void png_handle_IEND PNGARG((png_structp png_ptr, png_infop info_ptr, 2980 png_uint_32 length)); 2981 2982 #if defined(PNG_READ_bKGD_SUPPORTED) 2983 PNG_EXTERN void png_handle_bKGD PNGARG((png_structp png_ptr, png_infop info_ptr, 2984 png_uint_32 length)); 2985 #endif 2986 2987 #if defined(PNG_READ_cHRM_SUPPORTED) 2988 PNG_EXTERN void png_handle_cHRM PNGARG((png_structp png_ptr, png_infop info_ptr, 2989 png_uint_32 length)); 2990 #endif 2991 2992 #if defined(PNG_READ_gAMA_SUPPORTED) 2993 PNG_EXTERN void png_handle_gAMA PNGARG((png_structp png_ptr, png_infop info_ptr, 2994 png_uint_32 length)); 2995 #endif 2996 2997 #if defined(PNG_READ_hIST_SUPPORTED) 2998 PNG_EXTERN void png_handle_hIST PNGARG((png_structp png_ptr, png_infop info_ptr, 2999 png_uint_32 length)); 3000 #endif 3001 3002 #if defined(PNG_READ_iCCP_SUPPORTED) 3003 extern void png_handle_iCCP PNGARG((png_structp png_ptr, png_infop info_ptr, 3004 png_uint_32 length)); 3005 #endif /* PNG_READ_iCCP_SUPPORTED */ 3006 3007 #if defined(PNG_READ_iTXt_SUPPORTED) 3008 PNG_EXTERN void png_handle_iTXt PNGARG((png_structp png_ptr, png_infop info_ptr, 3009 png_uint_32 length)); 3010 #endif 3011 3012 #if defined(PNG_READ_oFFs_SUPPORTED) 3013 PNG_EXTERN void png_handle_oFFs PNGARG((png_structp png_ptr, png_infop info_ptr, 3014 png_uint_32 length)); 3015 #endif 3016 3017 #if defined(PNG_READ_pCAL_SUPPORTED) 3018 PNG_EXTERN void png_handle_pCAL PNGARG((png_structp png_ptr, png_infop info_ptr, 3019 png_uint_32 length)); 3020 #endif 3021 3022 #if defined(PNG_READ_pHYs_SUPPORTED) 3023 PNG_EXTERN void png_handle_pHYs PNGARG((png_structp png_ptr, png_infop info_ptr, 3024 png_uint_32 length)); 3025 #endif 3026 3027 #if defined(PNG_READ_sBIT_SUPPORTED) 3028 PNG_EXTERN void png_handle_sBIT PNGARG((png_structp png_ptr, png_infop info_ptr, 3029 png_uint_32 length)); 3030 #endif 3031 3032 #if defined(PNG_READ_sCAL_SUPPORTED) 3033 PNG_EXTERN void png_handle_sCAL PNGARG((png_structp png_ptr, png_infop info_ptr, 3034 png_uint_32 length)); 3035 #endif 3036 3037 #if defined(PNG_READ_sPLT_SUPPORTED) 3038 extern void png_handle_sPLT PNGARG((png_structp png_ptr, png_infop info_ptr, 3039 png_uint_32 length)); 3040 #endif /* PNG_READ_sPLT_SUPPORTED */ 3041 3042 #if defined(PNG_READ_sRGB_SUPPORTED) 3043 PNG_EXTERN void png_handle_sRGB PNGARG((png_structp png_ptr, png_infop info_ptr, 3044 png_uint_32 length)); 3045 #endif 3046 3047 #if defined(PNG_READ_tEXt_SUPPORTED) 3048 PNG_EXTERN void png_handle_tEXt PNGARG((png_structp png_ptr, png_infop info_ptr, 3049 png_uint_32 length)); 3050 #endif 3051 3052 #if defined(PNG_READ_tIME_SUPPORTED) 3053 PNG_EXTERN void png_handle_tIME PNGARG((png_structp png_ptr, png_infop info_ptr, 3054 png_uint_32 length)); 3055 #endif 3056 3057 #if defined(PNG_READ_tRNS_SUPPORTED) 3058 PNG_EXTERN void png_handle_tRNS PNGARG((png_structp png_ptr, png_infop info_ptr, 3059 png_uint_32 length)); 3060 #endif 3061 3062 #if defined(PNG_READ_zTXt_SUPPORTED) 3063 PNG_EXTERN void png_handle_zTXt PNGARG((png_structp png_ptr, png_infop info_ptr, 3064 png_uint_32 length)); 3065 #endif 3066 3067 #ifdef PNG_HANDLE_AS_UNKNOWN_SUPPORTED 3068 PNG_EXTERN int png_handle_as_unknown PNGARG((png_structp png_ptr, png_bytep 3069 chunk_name)); 3070 #endif 3071 3072 PNG_EXTERN void png_handle_unknown PNGARG((png_structp png_ptr, 3073 png_infop info_ptr, png_uint_32 length)); 3074 3075 PNG_EXTERN void png_check_chunk_name PNGARG((png_structp png_ptr, 3076 png_bytep chunk_name)); 3077 3078 /* handle the transformations for reading and writing */ 3079 PNG_EXTERN void png_do_read_transformations PNGARG((png_structp png_ptr)); 3080 PNG_EXTERN void png_do_write_transformations PNGARG((png_structp png_ptr)); 3081 3082 PNG_EXTERN void png_init_read_transformations PNGARG((png_structp png_ptr)); 3083 3084 #ifdef PNG_PROGRESSIVE_READ_SUPPORTED 3085 PNG_EXTERN void png_push_read_chunk PNGARG((png_structp png_ptr, 3086 png_infop info_ptr)); 3087 PNG_EXTERN void png_push_read_sig PNGARG((png_structp png_ptr, 3088 png_infop info_ptr)); 3089 PNG_EXTERN void png_push_check_crc PNGARG((png_structp png_ptr)); 3090 PNG_EXTERN void png_push_crc_skip PNGARG((png_structp png_ptr, 3091 png_uint_32 length)); 3092 PNG_EXTERN void png_push_crc_finish PNGARG((png_structp png_ptr)); 3093 PNG_EXTERN void png_push_fill_buffer PNGARG((png_structp png_ptr, 3094 png_bytep buffer, png_size_t length)); 3095 PNG_EXTERN void png_push_save_buffer PNGARG((png_structp png_ptr)); 3096 PNG_EXTERN void png_push_restore_buffer PNGARG((png_structp png_ptr, 3097 png_bytep buffer, png_size_t buffer_length)); 3098 PNG_EXTERN void png_push_read_IDAT PNGARG((png_structp png_ptr)); 3099 PNG_EXTERN void png_process_IDAT_data PNGARG((png_structp png_ptr, 3100 png_bytep buffer, png_size_t buffer_length)); 3101 PNG_EXTERN void png_push_process_row PNGARG((png_structp png_ptr)); 3102 PNG_EXTERN void png_push_handle_unknown PNGARG((png_structp png_ptr, 3103 png_infop info_ptr, png_uint_32 length)); 3104 PNG_EXTERN void png_push_have_info PNGARG((png_structp png_ptr, 3105 png_infop info_ptr)); 3106 PNG_EXTERN void png_push_have_end PNGARG((png_structp png_ptr, 3107 png_infop info_ptr)); 3108 PNG_EXTERN void png_push_have_row PNGARG((png_structp png_ptr, png_bytep row)); 3109 PNG_EXTERN void png_push_read_end PNGARG((png_structp png_ptr, 3110 png_infop info_ptr)); 3111 PNG_EXTERN void png_process_some_data PNGARG((png_structp png_ptr, 3112 png_infop info_ptr)); 3113 PNG_EXTERN void png_read_push_finish_row PNGARG((png_structp png_ptr)); 3114 #if defined(PNG_READ_tEXt_SUPPORTED) 3115 PNG_EXTERN void png_push_handle_tEXt PNGARG((png_structp png_ptr, 3116 png_infop info_ptr, png_uint_32 length)); 3117 PNG_EXTERN void png_push_read_tEXt PNGARG((png_structp png_ptr, 3118 png_infop info_ptr)); 3119 #endif 3120 #if defined(PNG_READ_zTXt_SUPPORTED) 3121 PNG_EXTERN void png_push_handle_zTXt PNGARG((png_structp png_ptr, 3122 png_infop info_ptr, png_uint_32 length)); 3123 PNG_EXTERN void png_push_read_zTXt PNGARG((png_structp png_ptr, 3124 png_infop info_ptr)); 3125 #endif 3126 #if defined(PNG_READ_iTXt_SUPPORTED) 3127 PNG_EXTERN void png_push_handle_iTXt PNGARG((png_structp png_ptr, 3128 png_infop info_ptr, png_uint_32 length)); 3129 PNG_EXTERN void png_push_read_iTXt PNGARG((png_structp png_ptr, 3130 png_infop info_ptr)); 3131 #endif 3132 3133 #endif /* PNG_PROGRESSIVE_READ_SUPPORTED */ 3134 3135 #ifdef PNG_MNG_FEATURES_SUPPORTED 3136 PNG_EXTERN void png_do_read_intrapixel PNGARG((png_row_infop row_info, 3137 png_bytep row)); 3138 PNG_EXTERN void png_do_write_intrapixel PNGARG((png_row_infop row_info, 3139 png_bytep row)); 3140 #endif 3141 3142 #if defined(PNG_ASSEMBLER_CODE_SUPPORTED) 3143 /* png.c */ /* PRIVATE */ 3144 PNG_EXTERN void png_init_mmx_flags PNGARG((png_structp png_ptr)); 3145 #endif 3146 /* Maintainer: Put new private prototypes here ^ and in libpngpf.3 */ 3147 3148 #endif /* PNG_INTERNAL */ 3149 3150 #ifdef __cplusplus 3151 } 3152 #endif 3153 3154 #endif /* PNG_VERSION_INFO_ONLY */ 3155 /* do not put anything past this line */ 3156 #endif /* PNG_H */ 3157