1 2/* pngpriv.h - private declarations for use inside libpng 3 * 4 * libpng version 1.4.3 - June 26, 2010 5 * For conditions of distribution and use, see copyright notice in png.h 6 * Copyright (c) 1998-2010 Glenn Randers-Pehrson 7 * (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger) 8 * (Version 0.88 Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.) 9 * 10 * This code is released under the libpng license. 11 * For conditions of distribution and use, see the disclaimer 12 * and license in png.h 13 */ 14 15/* The symbols declared in this file (including the functions declared 16 * as PNG_EXTERN) are PRIVATE. They are not part of the libpng public 17 * interface, and are not recommended for use by regular applications. 18 * Some of them may become public in the future; others may stay private, 19 * change in an incompatible way, or even disappear. 20 * Although the libpng users are not forbidden to include this header, 21 * they should be well aware of the issues that may arise from doing so. 22 */ 23 24#ifndef PNGPRIV_H 25#define PNGPRIV_H 26 27#ifndef PNG_VERSION_INFO_ONLY 28 29#include <stdlib.h> 30 31#ifndef PNG_EXTERN 32/* The functions exported by PNG_EXTERN are internal functions, which 33 * aren't usually used outside the library (as far as I know), so it is 34 * debatable if they should be exported at all. In the future, when it 35 * is possible to have run-time registry of chunk-handling functions, 36 * some of these will be made available again. 37# define PNG_EXTERN extern 38 */ 39# define PNG_EXTERN 40#endif 41 42/* Other defines specific to compilers can go here. Try to keep 43 * them inside an appropriate ifdef/endif pair for portability. 44 */ 45 46#ifdef PNG_FLOATING_POINT_SUPPORTED 47# ifdef MACOS 48 /* We need to check that <math.h> hasn't already been included earlier 49 * as it seems it doesn't agree with <fp.h>, yet we should really use 50 * <fp.h> if possible. 51 */ 52# if !defined(__MATH_H__) && !defined(__MATH_H) && !defined(__cmath__) 53# include <fp.h> 54# endif 55# else 56# include <math.h> 57# endif 58# if defined(_AMIGA) && defined(__SASC) && defined(_M68881) 59 /* Amiga SAS/C: We must include builtin FPU functions when compiling using 60 * MATH=68881 61 */ 62# include <m68881.h> 63# endif 64#endif 65 66/* Codewarrior on NT has linking problems without this. */ 67#if (defined(__MWERKS__) && defined(WIN32)) || defined(__STDC__) 68# define PNG_ALWAYS_EXTERN 69#endif 70 71/* This provides the non-ANSI (far) memory allocation routines. */ 72#if defined(__TURBOC__) && defined(__MSDOS__) 73# include <mem.h> 74# include <alloc.h> 75#endif 76 77#if defined(WIN32) || defined(_Windows) || defined(_WINDOWS) || \ 78 defined(_WIN32) || defined(__WIN32__) 79# include <windows.h> /* defines _WINDOWS_ macro */ 80/* I have no idea why is this necessary... */ 81# ifdef _MSC_VER 82# include <malloc.h> 83# endif 84#endif 85 86/* Various modes of operation. Note that after an init, mode is set to 87 * zero automatically when the structure is created. 88 */ 89#define PNG_HAVE_IHDR 0x01 90#define PNG_HAVE_PLTE 0x02 91#define PNG_HAVE_IDAT 0x04 92#define PNG_AFTER_IDAT 0x08 /* Have complete zlib datastream */ 93#define PNG_HAVE_IEND 0x10 94#define PNG_HAVE_gAMA 0x20 95#define PNG_HAVE_cHRM 0x40 96#define PNG_HAVE_sRGB 0x80 97#define PNG_HAVE_CHUNK_HEADER 0x100 98#define PNG_WROTE_tIME 0x200 99#define PNG_WROTE_INFO_BEFORE_PLTE 0x400 100#define PNG_BACKGROUND_IS_GRAY 0x800 101#define PNG_HAVE_PNG_SIGNATURE 0x1000 102#define PNG_HAVE_CHUNK_AFTER_IDAT 0x2000 /* Have another chunk after IDAT */ 103 104/* Flags for the transformations the PNG library does on the image data */ 105#define PNG_BGR 0x0001 106#define PNG_INTERLACE 0x0002 107#define PNG_PACK 0x0004 108#define PNG_SHIFT 0x0008 109#define PNG_SWAP_BYTES 0x0010 110#define PNG_INVERT_MONO 0x0020 111#define PNG_QUANTIZE 0x0040 /* formerly PNG_DITHER */ 112#define PNG_BACKGROUND 0x0080 113#define PNG_BACKGROUND_EXPAND 0x0100 114 /* 0x0200 unused */ 115#define PNG_16_TO_8 0x0400 116#define PNG_RGBA 0x0800 117#define PNG_EXPAND 0x1000 118#define PNG_GAMMA 0x2000 119#define PNG_GRAY_TO_RGB 0x4000 120#define PNG_FILLER 0x8000L 121#define PNG_PACKSWAP 0x10000L 122#define PNG_SWAP_ALPHA 0x20000L 123#define PNG_STRIP_ALPHA 0x40000L 124#define PNG_INVERT_ALPHA 0x80000L 125#define PNG_USER_TRANSFORM 0x100000L 126#define PNG_RGB_TO_GRAY_ERR 0x200000L 127#define PNG_RGB_TO_GRAY_WARN 0x400000L 128#define PNG_RGB_TO_GRAY 0x600000L /* two bits, RGB_TO_GRAY_ERR|WARN */ 129 /* 0x800000L Unused */ 130#define PNG_ADD_ALPHA 0x1000000L /* Added to libpng-1.2.7 */ 131#define PNG_EXPAND_tRNS 0x2000000L /* Added to libpng-1.2.9 */ 132 /* 0x4000000L unused */ 133 /* 0x8000000L unused */ 134 /* 0x10000000L unused */ 135 /* 0x20000000L unused */ 136 /* 0x40000000L unused */ 137 138/* Flags for png_create_struct */ 139#define PNG_STRUCT_PNG 0x0001 140#define PNG_STRUCT_INFO 0x0002 141 142/* Scaling factor for filter heuristic weighting calculations */ 143#define PNG_WEIGHT_SHIFT 8 144#define PNG_WEIGHT_FACTOR (1<<(PNG_WEIGHT_SHIFT)) 145#define PNG_COST_SHIFT 3 146#define PNG_COST_FACTOR (1<<(PNG_COST_SHIFT)) 147 148/* Flags for the png_ptr->flags rather than declaring a byte for each one */ 149#define PNG_FLAG_ZLIB_CUSTOM_STRATEGY 0x0001 150#define PNG_FLAG_ZLIB_CUSTOM_LEVEL 0x0002 151#define PNG_FLAG_ZLIB_CUSTOM_MEM_LEVEL 0x0004 152#define PNG_FLAG_ZLIB_CUSTOM_WINDOW_BITS 0x0008 153#define PNG_FLAG_ZLIB_CUSTOM_METHOD 0x0010 154#define PNG_FLAG_ZLIB_FINISHED 0x0020 155#define PNG_FLAG_ROW_INIT 0x0040 156#define PNG_FLAG_FILLER_AFTER 0x0080 157#define PNG_FLAG_CRC_ANCILLARY_USE 0x0100 158#define PNG_FLAG_CRC_ANCILLARY_NOWARN 0x0200 159#define PNG_FLAG_CRC_CRITICAL_USE 0x0400 160#define PNG_FLAG_CRC_CRITICAL_IGNORE 0x0800 161 /* 0x1000 unused */ 162 /* 0x2000 unused */ 163 /* 0x4000 unused */ 164#define PNG_FLAG_KEEP_UNKNOWN_CHUNKS 0x8000L 165#define PNG_FLAG_KEEP_UNSAFE_CHUNKS 0x10000L 166#define PNG_FLAG_LIBRARY_MISMATCH 0x20000L 167#define PNG_FLAG_STRIP_ERROR_NUMBERS 0x40000L 168#define PNG_FLAG_STRIP_ERROR_TEXT 0x80000L 169#define PNG_FLAG_MALLOC_NULL_MEM_OK 0x100000L 170#define PNG_FLAG_ADD_ALPHA 0x200000L /* Added to libpng-1.2.8 */ 171#define PNG_FLAG_STRIP_ALPHA 0x400000L /* Added to libpng-1.2.8 */ 172#define PNG_FLAG_BENIGN_ERRORS_WARN 0x800000L /* Added to libpng-1.4.0 */ 173 /* 0x1000000L unused */ 174 /* 0x2000000L unused */ 175 /* 0x4000000L unused */ 176 /* 0x8000000L unused */ 177 /* 0x10000000L unused */ 178 /* 0x20000000L unused */ 179 /* 0x40000000L unused */ 180 181#define PNG_FLAG_CRC_ANCILLARY_MASK (PNG_FLAG_CRC_ANCILLARY_USE | \ 182 PNG_FLAG_CRC_ANCILLARY_NOWARN) 183 184#define PNG_FLAG_CRC_CRITICAL_MASK (PNG_FLAG_CRC_CRITICAL_USE | \ 185 PNG_FLAG_CRC_CRITICAL_IGNORE) 186 187#define PNG_FLAG_CRC_MASK (PNG_FLAG_CRC_ANCILLARY_MASK | \ 188 PNG_FLAG_CRC_CRITICAL_MASK) 189 190/* Save typing and make code easier to understand */ 191 192#define PNG_COLOR_DIST(c1, c2) (abs((int)((c1).red) - (int)((c2).red)) + \ 193 abs((int)((c1).green) - (int)((c2).green)) + \ 194 abs((int)((c1).blue) - (int)((c2).blue))) 195 196/* Added to libpng-1.2.6 JB */ 197#define PNG_ROWBYTES(pixel_bits, width) \ 198 ((pixel_bits) >= 8 ? \ 199 ((png_size_t)(width) * (((png_size_t)(pixel_bits)) >> 3)) : \ 200 (( ((png_size_t)(width) * ((png_size_t)(pixel_bits))) + 7) >> 3) ) 201 202/* PNG_OUT_OF_RANGE returns true if value is outside the range 203 * ideal-delta..ideal+delta. Each argument is evaluated twice. 204 * "ideal" and "delta" should be constants, normally simple 205 * integers, "value" a variable. Added to libpng-1.2.6 JB 206 */ 207#define PNG_OUT_OF_RANGE(value, ideal, delta) \ 208 ( (value) < (ideal)-(delta) || (value) > (ideal)+(delta) ) 209 210/* Constant strings for known chunk types. If you need to add a chunk, 211 * define the name here, and add an invocation of the macro wherever it's 212 * needed. 213 */ 214#define PNG_IHDR PNG_CONST png_byte png_IHDR[5] = { 73, 72, 68, 82, '\0'} 215#define PNG_IDAT PNG_CONST png_byte png_IDAT[5] = { 73, 68, 65, 84, '\0'} 216#define PNG_IEND PNG_CONST png_byte png_IEND[5] = { 73, 69, 78, 68, '\0'} 217#define PNG_PLTE PNG_CONST png_byte png_PLTE[5] = { 80, 76, 84, 69, '\0'} 218#define PNG_bKGD PNG_CONST png_byte png_bKGD[5] = { 98, 75, 71, 68, '\0'} 219#define PNG_cHRM PNG_CONST png_byte png_cHRM[5] = { 99, 72, 82, 77, '\0'} 220#define PNG_gAMA PNG_CONST png_byte png_gAMA[5] = {103, 65, 77, 65, '\0'} 221#define PNG_hIST PNG_CONST png_byte png_hIST[5] = {104, 73, 83, 84, '\0'} 222#define PNG_iCCP PNG_CONST png_byte png_iCCP[5] = {105, 67, 67, 80, '\0'} 223#define PNG_iTXt PNG_CONST png_byte png_iTXt[5] = {105, 84, 88, 116, '\0'} 224#define PNG_oFFs PNG_CONST png_byte png_oFFs[5] = {111, 70, 70, 115, '\0'} 225#define PNG_pCAL PNG_CONST png_byte png_pCAL[5] = {112, 67, 65, 76, '\0'} 226#define PNG_sCAL PNG_CONST png_byte png_sCAL[5] = {115, 67, 65, 76, '\0'} 227#define PNG_pHYs PNG_CONST png_byte png_pHYs[5] = {112, 72, 89, 115, '\0'} 228#define PNG_sBIT PNG_CONST png_byte png_sBIT[5] = {115, 66, 73, 84, '\0'} 229#define PNG_sPLT PNG_CONST png_byte png_sPLT[5] = {115, 80, 76, 84, '\0'} 230#define PNG_sRGB PNG_CONST png_byte png_sRGB[5] = {115, 82, 71, 66, '\0'} 231#define PNG_sTER PNG_CONST png_byte png_sTER[5] = {115, 84, 69, 82, '\0'} 232#define PNG_tEXt PNG_CONST png_byte png_tEXt[5] = {116, 69, 88, 116, '\0'} 233#define PNG_tIME PNG_CONST png_byte png_tIME[5] = {116, 73, 77, 69, '\0'} 234#define PNG_tRNS PNG_CONST png_byte png_tRNS[5] = {116, 82, 78, 83, '\0'} 235#define PNG_zTXt PNG_CONST png_byte png_zTXt[5] = {122, 84, 88, 116, '\0'} 236 237 238/* Inhibit C++ name-mangling for libpng functions but not for system calls. */ 239#ifdef __cplusplus 240extern "C" { 241#endif /* __cplusplus */ 242 243/* These functions are used internally in the code. They generally 244 * shouldn't be used unless you are writing code to add or replace some 245 * functionality in libpng. More information about most functions can 246 * be found in the files where the functions are located. 247 */ 248 249/* Allocate memory for an internal libpng struct */ 250PNG_EXTERN png_voidp png_create_struct PNGARG((int type)); 251 252/* Free memory from internal libpng struct */ 253PNG_EXTERN void png_destroy_struct PNGARG((png_voidp struct_ptr)); 254 255PNG_EXTERN png_voidp png_create_struct_2 PNGARG((int type, png_malloc_ptr 256 malloc_fn, png_voidp mem_ptr)); 257PNG_EXTERN void png_destroy_struct_2 PNGARG((png_voidp struct_ptr, 258 png_free_ptr free_fn, png_voidp mem_ptr)); 259 260/* Free any memory that info_ptr points to and reset struct. */ 261PNG_EXTERN void png_info_destroy PNGARG((png_structp png_ptr, 262 png_infop info_ptr)); 263 264/* Function to allocate memory for zlib. PNGAPI is disallowed. */ 265PNG_EXTERN voidpf png_zalloc PNGARG((voidpf png_ptr, uInt items, uInt size)); 266 267/* Function to free memory for zlib. PNGAPI is disallowed. */ 268PNG_EXTERN void png_zfree PNGARG((voidpf png_ptr, voidpf ptr)); 269 270/* Next four functions are used internally as callbacks. PNGAPI is required 271 * but not PNG_EXPORT. PNGAPI added at libpng version 1.2.3. */ 272 273PNG_EXTERN void PNGAPI png_default_read_data PNGARG((png_structp png_ptr, 274 png_bytep data, png_size_t length)); 275 276#ifdef PNG_PROGRESSIVE_READ_SUPPORTED 277PNG_EXTERN void PNGAPI png_push_fill_buffer PNGARG((png_structp png_ptr, 278 png_bytep buffer, png_size_t length)); 279#endif 280 281PNG_EXTERN void PNGAPI png_default_write_data PNGARG((png_structp png_ptr, 282 png_bytep data, png_size_t length)); 283 284#ifdef PNG_WRITE_FLUSH_SUPPORTED 285#ifdef PNG_STDIO_SUPPORTED 286PNG_EXTERN void PNGAPI png_default_flush PNGARG((png_structp png_ptr)); 287#endif 288#endif 289 290/* Reset the CRC variable */ 291PNG_EXTERN void png_reset_crc PNGARG((png_structp png_ptr)); 292 293/* Write the "data" buffer to whatever output you are using */ 294PNG_EXTERN void png_write_data PNGARG((png_structp png_ptr, png_bytep data, 295 png_size_t length)); 296 297/* Read the chunk header (length + type name) */ 298PNG_EXTERN png_uint_32 png_read_chunk_header PNGARG((png_structp png_ptr)); 299 300/* Read data from whatever input you are using into the "data" buffer */ 301PNG_EXTERN void png_read_data PNGARG((png_structp png_ptr, png_bytep data, 302 png_size_t length)); 303 304/* Read bytes into buf, and update png_ptr->crc */ 305PNG_EXTERN void png_crc_read PNGARG((png_structp png_ptr, png_bytep buf, 306 png_size_t length)); 307 308/* Decompress data in a chunk that uses compression */ 309#if defined(PNG_zTXt_SUPPORTED) || defined(PNG_iTXt_SUPPORTED) || \ 310 defined(PNG_iCCP_SUPPORTED) || defined(PNG_sPLT_SUPPORTED) 311PNG_EXTERN void png_decompress_chunk PNGARG((png_structp png_ptr, 312 int comp_type, png_size_t chunklength, png_size_t prefix_length, 313 png_size_t *data_length)); 314#endif 315 316/* Read "skip" bytes, read the file crc, and (optionally) verify png_ptr->crc */ 317PNG_EXTERN int png_crc_finish PNGARG((png_structp png_ptr, png_uint_32 skip)); 318 319/* Read the CRC from the file and compare it to the libpng calculated CRC */ 320PNG_EXTERN int png_crc_error PNGARG((png_structp png_ptr)); 321 322/* Calculate the CRC over a section of data. Note that we are only 323 * passing a maximum of 64K on systems that have this as a memory limit, 324 * since this is the maximum buffer size we can specify. 325 */ 326PNG_EXTERN void png_calculate_crc PNGARG((png_structp png_ptr, png_bytep ptr, 327 png_size_t length)); 328 329#ifdef PNG_WRITE_FLUSH_SUPPORTED 330PNG_EXTERN void png_flush PNGARG((png_structp png_ptr)); 331#endif 332 333/* Write various chunks */ 334 335/* Write the IHDR chunk, and update the png_struct with the necessary 336 * information. 337 */ 338PNG_EXTERN void png_write_IHDR PNGARG((png_structp png_ptr, png_uint_32 width, 339 png_uint_32 height, 340 int bit_depth, int color_type, int compression_method, int filter_method, 341 int interlace_method)); 342 343PNG_EXTERN void png_write_PLTE PNGARG((png_structp png_ptr, png_colorp palette, 344 png_uint_32 num_pal)); 345 346PNG_EXTERN void png_write_IDAT PNGARG((png_structp png_ptr, png_bytep data, 347 png_size_t length)); 348 349PNG_EXTERN void png_write_IEND PNGARG((png_structp png_ptr)); 350 351#ifdef PNG_WRITE_gAMA_SUPPORTED 352#ifdef PNG_FLOATING_POINT_SUPPORTED 353PNG_EXTERN void png_write_gAMA PNGARG((png_structp png_ptr, double file_gamma)); 354#endif 355#ifdef PNG_FIXED_POINT_SUPPORTED 356PNG_EXTERN void png_write_gAMA_fixed PNGARG((png_structp png_ptr, 357 png_fixed_point file_gamma)); 358#endif 359#endif 360 361#ifdef PNG_WRITE_sBIT_SUPPORTED 362PNG_EXTERN void png_write_sBIT PNGARG((png_structp png_ptr, png_color_8p sbit, 363 int color_type)); 364#endif 365 366#ifdef PNG_WRITE_cHRM_SUPPORTED 367#ifdef PNG_FLOATING_POINT_SUPPORTED 368PNG_EXTERN void png_write_cHRM PNGARG((png_structp png_ptr, 369 double white_x, double white_y, 370 double red_x, double red_y, double green_x, double green_y, 371 double blue_x, double blue_y)); 372#endif 373PNG_EXTERN void png_write_cHRM_fixed PNGARG((png_structp png_ptr, 374 png_fixed_point int_white_x, png_fixed_point int_white_y, 375 png_fixed_point int_red_x, png_fixed_point int_red_y, png_fixed_point 376 int_green_x, png_fixed_point int_green_y, png_fixed_point int_blue_x, 377 png_fixed_point int_blue_y)); 378#endif 379 380#ifdef PNG_WRITE_sRGB_SUPPORTED 381PNG_EXTERN void png_write_sRGB PNGARG((png_structp png_ptr, 382 int intent)); 383#endif 384 385#ifdef PNG_WRITE_iCCP_SUPPORTED 386PNG_EXTERN void png_write_iCCP PNGARG((png_structp png_ptr, 387 png_charp name, int compression_type, 388 png_charp profile, int proflen)); 389 /* Note to maintainer: profile should be png_bytep */ 390#endif 391 392#ifdef PNG_WRITE_sPLT_SUPPORTED 393PNG_EXTERN void png_write_sPLT PNGARG((png_structp png_ptr, 394 png_sPLT_tp palette)); 395#endif 396 397#ifdef PNG_WRITE_tRNS_SUPPORTED 398PNG_EXTERN void png_write_tRNS PNGARG((png_structp png_ptr, png_bytep trans, 399 png_color_16p values, int number, int color_type)); 400#endif 401 402#ifdef PNG_WRITE_bKGD_SUPPORTED 403PNG_EXTERN void png_write_bKGD PNGARG((png_structp png_ptr, 404 png_color_16p values, int color_type)); 405#endif 406 407#ifdef PNG_WRITE_hIST_SUPPORTED 408PNG_EXTERN void png_write_hIST PNGARG((png_structp png_ptr, png_uint_16p hist, 409 int num_hist)); 410#endif 411 412#if defined(PNG_WRITE_TEXT_SUPPORTED) || defined(PNG_WRITE_pCAL_SUPPORTED) || \ 413 defined(PNG_WRITE_iCCP_SUPPORTED) || defined(PNG_WRITE_sPLT_SUPPORTED) 414PNG_EXTERN png_size_t png_check_keyword PNGARG((png_structp png_ptr, 415 png_charp key, png_charpp new_key)); 416#endif 417 418#ifdef PNG_WRITE_tEXt_SUPPORTED 419PNG_EXTERN void png_write_tEXt PNGARG((png_structp png_ptr, png_charp key, 420 png_charp text, png_size_t text_len)); 421#endif 422 423#ifdef PNG_WRITE_zTXt_SUPPORTED 424PNG_EXTERN void png_write_zTXt PNGARG((png_structp png_ptr, png_charp key, 425 png_charp text, png_size_t text_len, int compression)); 426#endif 427 428#ifdef PNG_WRITE_iTXt_SUPPORTED 429PNG_EXTERN void png_write_iTXt PNGARG((png_structp png_ptr, 430 int compression, png_charp key, png_charp lang, png_charp lang_key, 431 png_charp text)); 432#endif 433 434#ifdef PNG_TEXT_SUPPORTED /* Added at version 1.0.14 and 1.2.4 */ 435PNG_EXTERN int png_set_text_2 PNGARG((png_structp png_ptr, 436 png_infop info_ptr, png_textp text_ptr, int num_text)); 437#endif 438 439#ifdef PNG_WRITE_oFFs_SUPPORTED 440PNG_EXTERN void png_write_oFFs PNGARG((png_structp png_ptr, 441 png_int_32 x_offset, png_int_32 y_offset, int unit_type)); 442#endif 443 444#ifdef PNG_WRITE_pCAL_SUPPORTED 445PNG_EXTERN void png_write_pCAL PNGARG((png_structp png_ptr, png_charp purpose, 446 png_int_32 X0, png_int_32 X1, int type, int nparams, 447 png_charp units, png_charpp params)); 448#endif 449 450#ifdef PNG_WRITE_pHYs_SUPPORTED 451PNG_EXTERN void png_write_pHYs PNGARG((png_structp png_ptr, 452 png_uint_32 x_pixels_per_unit, png_uint_32 y_pixels_per_unit, 453 int unit_type)); 454#endif 455 456#ifdef PNG_WRITE_tIME_SUPPORTED 457PNG_EXTERN void png_write_tIME PNGARG((png_structp png_ptr, 458 png_timep mod_time)); 459#endif 460 461#ifdef PNG_WRITE_sCAL_SUPPORTED 462#if defined(PNG_FLOATING_POINT_SUPPORTED) && defined(PNG_STDIO_SUPPORTED) 463PNG_EXTERN void png_write_sCAL PNGARG((png_structp png_ptr, 464 int unit, double width, double height)); 465#else 466#ifdef PNG_FIXED_POINT_SUPPORTED 467PNG_EXTERN void png_write_sCAL_s PNGARG((png_structp png_ptr, 468 int unit, png_charp width, png_charp height)); 469#endif 470#endif 471#endif 472 473/* Called when finished processing a row of data */ 474PNG_EXTERN void png_write_finish_row PNGARG((png_structp png_ptr)); 475 476/* Internal use only. Called before first row of data */ 477PNG_EXTERN void png_write_start_row PNGARG((png_structp png_ptr)); 478 479#ifdef PNG_READ_GAMMA_SUPPORTED 480PNG_EXTERN void png_build_gamma_table PNGARG((png_structp png_ptr, 481 png_byte bit_depth)); 482#endif 483 484/* Combine a row of data, dealing with alpha, etc. if requested */ 485PNG_EXTERN void png_combine_row PNGARG((png_structp png_ptr, png_bytep row, 486 int mask)); 487 488#ifdef PNG_READ_INTERLACING_SUPPORTED 489/* Expand an interlaced row */ 490/* OLD pre-1.0.9 interface: 491PNG_EXTERN void png_do_read_interlace PNGARG((png_row_infop row_info, 492 png_bytep row, int pass, png_uint_32 transformations)); 493 */ 494PNG_EXTERN void png_do_read_interlace PNGARG((png_structp png_ptr)); 495#endif 496 497/* GRR TO DO (2.0 or whenever): simplify other internal calling interfaces */ 498 499#ifdef PNG_WRITE_INTERLACING_SUPPORTED 500/* Grab pixels out of a row for an interlaced pass */ 501PNG_EXTERN void png_do_write_interlace PNGARG((png_row_infop row_info, 502 png_bytep row, int pass)); 503#endif 504 505/* Unfilter a row */ 506PNG_EXTERN void png_read_filter_row PNGARG((png_structp png_ptr, 507 png_row_infop row_info, png_bytep row, png_bytep prev_row, int filter)); 508 509/* Choose the best filter to use and filter the row data */ 510PNG_EXTERN void png_write_find_filter PNGARG((png_structp png_ptr, 511 png_row_infop row_info)); 512 513/* Write out the filtered row. */ 514PNG_EXTERN void png_write_filtered_row PNGARG((png_structp png_ptr, 515 png_bytep filtered_row)); 516/* Finish a row while reading, dealing with interlacing passes, etc. */ 517PNG_EXTERN void png_read_finish_row PNGARG((png_structp png_ptr)); 518 519/* Initialize the row buffers, etc. */ 520PNG_EXTERN void png_read_start_row PNGARG((png_structp png_ptr)); 521/* Optional call to update the users info structure */ 522PNG_EXTERN void png_read_transform_info PNGARG((png_structp png_ptr, 523 png_infop info_ptr)); 524 525/* These are the functions that do the transformations */ 526#ifdef PNG_READ_FILLER_SUPPORTED 527PNG_EXTERN void png_do_read_filler PNGARG((png_row_infop row_info, 528 png_bytep row, png_uint_32 filler, png_uint_32 flags)); 529#endif 530 531#ifdef PNG_READ_SWAP_ALPHA_SUPPORTED 532PNG_EXTERN void png_do_read_swap_alpha PNGARG((png_row_infop row_info, 533 png_bytep row)); 534#endif 535 536#ifdef PNG_WRITE_SWAP_ALPHA_SUPPORTED 537PNG_EXTERN void png_do_write_swap_alpha PNGARG((png_row_infop row_info, 538 png_bytep row)); 539#endif 540 541#ifdef PNG_READ_INVERT_ALPHA_SUPPORTED 542PNG_EXTERN void png_do_read_invert_alpha PNGARG((png_row_infop row_info, 543 png_bytep row)); 544#endif 545 546#ifdef PNG_WRITE_INVERT_ALPHA_SUPPORTED 547PNG_EXTERN void png_do_write_invert_alpha PNGARG((png_row_infop row_info, 548 png_bytep row)); 549#endif 550 551#if defined(PNG_WRITE_FILLER_SUPPORTED) || \ 552 defined(PNG_READ_STRIP_ALPHA_SUPPORTED) 553PNG_EXTERN void png_do_strip_filler PNGARG((png_row_infop row_info, 554 png_bytep row, png_uint_32 flags)); 555#endif 556 557#if defined(PNG_READ_SWAP_SUPPORTED) || defined(PNG_WRITE_SWAP_SUPPORTED) 558PNG_EXTERN void png_do_swap PNGARG((png_row_infop row_info, png_bytep row)); 559#endif 560 561#if defined(PNG_READ_PACKSWAP_SUPPORTED) || \ 562 defined(PNG_WRITE_PACKSWAP_SUPPORTED) 563PNG_EXTERN void png_do_packswap PNGARG((png_row_infop row_info, png_bytep row)); 564#endif 565 566#ifdef PNG_READ_RGB_TO_GRAY_SUPPORTED 567PNG_EXTERN int png_do_rgb_to_gray PNGARG((png_structp png_ptr, png_row_infop 568 row_info, png_bytep row)); 569#endif 570 571#ifdef PNG_READ_GRAY_TO_RGB_SUPPORTED 572PNG_EXTERN void png_do_gray_to_rgb PNGARG((png_row_infop row_info, 573 png_bytep row)); 574#endif 575 576#ifdef PNG_READ_PACK_SUPPORTED 577PNG_EXTERN void png_do_unpack PNGARG((png_row_infop row_info, png_bytep row)); 578#endif 579 580#ifdef PNG_READ_SHIFT_SUPPORTED 581PNG_EXTERN void png_do_unshift PNGARG((png_row_infop row_info, png_bytep row, 582 png_color_8p sig_bits)); 583#endif 584 585#if defined(PNG_READ_INVERT_SUPPORTED) || defined(PNG_WRITE_INVERT_SUPPORTED) 586PNG_EXTERN void png_do_invert PNGARG((png_row_infop row_info, png_bytep row)); 587#endif 588 589#ifdef PNG_READ_16_TO_8_SUPPORTED 590PNG_EXTERN void png_do_chop PNGARG((png_row_infop row_info, png_bytep row)); 591#endif 592 593#ifdef PNG_READ_QUANTIZE_SUPPORTED 594PNG_EXTERN void png_do_quantize PNGARG((png_row_infop row_info, 595 png_bytep row, png_bytep palette_lookup, png_bytep quantize_lookup)); 596 597# ifdef PNG_CORRECT_PALETTE_SUPPORTED 598PNG_EXTERN void png_correct_palette PNGARG((png_structp png_ptr, 599 png_colorp palette, int num_palette)); 600# endif 601#endif 602 603#if defined(PNG_READ_BGR_SUPPORTED) || defined(PNG_WRITE_BGR_SUPPORTED) 604PNG_EXTERN void png_do_bgr PNGARG((png_row_infop row_info, png_bytep row)); 605#endif 606 607#ifdef PNG_WRITE_PACK_SUPPORTED 608PNG_EXTERN void png_do_pack PNGARG((png_row_infop row_info, 609 png_bytep row, png_uint_32 bit_depth)); 610#endif 611 612#ifdef PNG_WRITE_SHIFT_SUPPORTED 613PNG_EXTERN void png_do_shift PNGARG((png_row_infop row_info, png_bytep row, 614 png_color_8p bit_depth)); 615#endif 616 617#ifdef PNG_READ_BACKGROUND_SUPPORTED 618#ifdef PNG_READ_GAMMA_SUPPORTED 619PNG_EXTERN void png_do_background PNGARG((png_row_infop row_info, png_bytep row, 620 png_color_16p trans_color, png_color_16p background, 621 png_color_16p background_1, 622 png_bytep gamma_table, png_bytep gamma_from_1, png_bytep gamma_to_1, 623 png_uint_16pp gamma_16, png_uint_16pp gamma_16_from_1, 624 png_uint_16pp gamma_16_to_1, int gamma_shift)); 625#else 626PNG_EXTERN void png_do_background PNGARG((png_row_infop row_info, png_bytep row, 627 png_color_16p trans_color, png_color_16p background)); 628#endif 629#endif 630 631#ifdef PNG_READ_GAMMA_SUPPORTED 632PNG_EXTERN void png_do_gamma PNGARG((png_row_infop row_info, png_bytep row, 633 png_bytep gamma_table, png_uint_16pp gamma_16_table, 634 int gamma_shift)); 635#endif 636 637#ifdef PNG_READ_EXPAND_SUPPORTED 638PNG_EXTERN void png_do_expand_palette PNGARG((png_row_infop row_info, 639 png_bytep row, png_colorp palette, png_bytep trans, int num_trans)); 640PNG_EXTERN void png_do_expand PNGARG((png_row_infop row_info, 641 png_bytep row, png_color_16p trans_value)); 642#endif 643 644/* The following decodes the appropriate chunks, and does error correction, 645 * then calls the appropriate callback for the chunk if it is valid. 646 */ 647 648/* Decode the IHDR chunk */ 649PNG_EXTERN void png_handle_IHDR PNGARG((png_structp png_ptr, png_infop info_ptr, 650 png_uint_32 length)); 651PNG_EXTERN void png_handle_PLTE PNGARG((png_structp png_ptr, png_infop info_ptr, 652 png_uint_32 length)); 653PNG_EXTERN void png_handle_IEND PNGARG((png_structp png_ptr, png_infop info_ptr, 654 png_uint_32 length)); 655 656#ifdef PNG_READ_bKGD_SUPPORTED 657PNG_EXTERN void png_handle_bKGD PNGARG((png_structp png_ptr, png_infop info_ptr, 658 png_uint_32 length)); 659#endif 660 661#ifdef PNG_READ_cHRM_SUPPORTED 662PNG_EXTERN void png_handle_cHRM PNGARG((png_structp png_ptr, png_infop info_ptr, 663 png_uint_32 length)); 664#endif 665 666#ifdef PNG_READ_gAMA_SUPPORTED 667PNG_EXTERN void png_handle_gAMA PNGARG((png_structp png_ptr, png_infop info_ptr, 668 png_uint_32 length)); 669#endif 670 671#ifdef PNG_READ_hIST_SUPPORTED 672PNG_EXTERN void png_handle_hIST PNGARG((png_structp png_ptr, png_infop info_ptr, 673 png_uint_32 length)); 674#endif 675 676#ifdef PNG_READ_iCCP_SUPPORTED 677PNG_EXTERN void png_handle_iCCP PNGARG((png_structp png_ptr, png_infop info_ptr, 678 png_uint_32 length)); 679#endif /* PNG_READ_iCCP_SUPPORTED */ 680 681#ifdef PNG_READ_iTXt_SUPPORTED 682PNG_EXTERN void png_handle_iTXt PNGARG((png_structp png_ptr, png_infop info_ptr, 683 png_uint_32 length)); 684#endif 685 686#ifdef PNG_READ_oFFs_SUPPORTED 687PNG_EXTERN void png_handle_oFFs PNGARG((png_structp png_ptr, png_infop info_ptr, 688 png_uint_32 length)); 689#endif 690 691#ifdef PNG_READ_pCAL_SUPPORTED 692PNG_EXTERN void png_handle_pCAL PNGARG((png_structp png_ptr, png_infop info_ptr, 693 png_uint_32 length)); 694#endif 695 696#ifdef PNG_READ_pHYs_SUPPORTED 697PNG_EXTERN void png_handle_pHYs PNGARG((png_structp png_ptr, png_infop info_ptr, 698 png_uint_32 length)); 699#endif 700 701#ifdef PNG_READ_sBIT_SUPPORTED 702PNG_EXTERN void png_handle_sBIT PNGARG((png_structp png_ptr, png_infop info_ptr, 703 png_uint_32 length)); 704#endif 705 706#ifdef PNG_READ_sCAL_SUPPORTED 707PNG_EXTERN void png_handle_sCAL PNGARG((png_structp png_ptr, png_infop info_ptr, 708 png_uint_32 length)); 709#endif 710 711#ifdef PNG_READ_sPLT_SUPPORTED 712PNG_EXTERN void png_handle_sPLT PNGARG((png_structp png_ptr, png_infop info_ptr, 713 png_uint_32 length)); 714#endif /* PNG_READ_sPLT_SUPPORTED */ 715 716#ifdef PNG_READ_sRGB_SUPPORTED 717PNG_EXTERN void png_handle_sRGB PNGARG((png_structp png_ptr, png_infop info_ptr, 718 png_uint_32 length)); 719#endif 720 721#ifdef PNG_READ_tEXt_SUPPORTED 722PNG_EXTERN void png_handle_tEXt PNGARG((png_structp png_ptr, png_infop info_ptr, 723 png_uint_32 length)); 724#endif 725 726#ifdef PNG_READ_tIME_SUPPORTED 727PNG_EXTERN void png_handle_tIME PNGARG((png_structp png_ptr, png_infop info_ptr, 728 png_uint_32 length)); 729#endif 730 731#ifdef PNG_READ_tRNS_SUPPORTED 732PNG_EXTERN void png_handle_tRNS PNGARG((png_structp png_ptr, png_infop info_ptr, 733 png_uint_32 length)); 734#endif 735 736#ifdef PNG_READ_zTXt_SUPPORTED 737PNG_EXTERN void png_handle_zTXt PNGARG((png_structp png_ptr, png_infop info_ptr, 738 png_uint_32 length)); 739#endif 740 741PNG_EXTERN void png_handle_unknown PNGARG((png_structp png_ptr, 742 png_infop info_ptr, png_uint_32 length)); 743 744PNG_EXTERN void png_check_chunk_name PNGARG((png_structp png_ptr, 745 png_bytep chunk_name)); 746 747/* Handle the transformations for reading and writing */ 748PNG_EXTERN void png_do_read_transformations PNGARG((png_structp png_ptr)); 749PNG_EXTERN void png_do_write_transformations PNGARG((png_structp png_ptr)); 750 751PNG_EXTERN void png_init_read_transformations PNGARG((png_structp png_ptr)); 752 753#ifdef PNG_PROGRESSIVE_READ_SUPPORTED 754PNG_EXTERN void png_push_read_chunk PNGARG((png_structp png_ptr, 755 png_infop info_ptr)); 756PNG_EXTERN void png_push_read_sig PNGARG((png_structp png_ptr, 757 png_infop info_ptr)); 758PNG_EXTERN void png_push_check_crc PNGARG((png_structp png_ptr)); 759PNG_EXTERN void png_push_crc_skip PNGARG((png_structp png_ptr, 760 png_uint_32 length)); 761PNG_EXTERN void png_push_crc_finish PNGARG((png_structp png_ptr)); 762PNG_EXTERN void png_push_save_buffer PNGARG((png_structp png_ptr)); 763PNG_EXTERN void png_push_restore_buffer PNGARG((png_structp png_ptr, 764 png_bytep buffer, png_size_t buffer_length)); 765PNG_EXTERN void png_push_read_IDAT PNGARG((png_structp png_ptr)); 766PNG_EXTERN void png_process_IDAT_data PNGARG((png_structp png_ptr, 767 png_bytep buffer, png_size_t buffer_length)); 768PNG_EXTERN void png_push_process_row PNGARG((png_structp png_ptr)); 769PNG_EXTERN void png_push_handle_unknown PNGARG((png_structp png_ptr, 770 png_infop info_ptr, png_uint_32 length)); 771PNG_EXTERN void png_push_have_info PNGARG((png_structp png_ptr, 772 png_infop info_ptr)); 773PNG_EXTERN void png_push_have_end PNGARG((png_structp png_ptr, 774 png_infop info_ptr)); 775PNG_EXTERN void png_push_have_row PNGARG((png_structp png_ptr, png_bytep row)); 776PNG_EXTERN void png_push_read_end PNGARG((png_structp png_ptr, 777 png_infop info_ptr)); 778PNG_EXTERN void png_process_some_data PNGARG((png_structp png_ptr, 779 png_infop info_ptr)); 780PNG_EXTERN void png_read_push_finish_row PNGARG((png_structp png_ptr)); 781#ifdef PNG_READ_tEXt_SUPPORTED 782PNG_EXTERN void png_push_handle_tEXt PNGARG((png_structp png_ptr, 783 png_infop info_ptr, png_uint_32 length)); 784PNG_EXTERN void png_push_read_tEXt PNGARG((png_structp png_ptr, 785 png_infop info_ptr)); 786#endif 787#ifdef PNG_READ_zTXt_SUPPORTED 788PNG_EXTERN void png_push_handle_zTXt PNGARG((png_structp png_ptr, 789 png_infop info_ptr, png_uint_32 length)); 790PNG_EXTERN void png_push_read_zTXt PNGARG((png_structp png_ptr, 791 png_infop info_ptr)); 792#endif 793#ifdef PNG_READ_iTXt_SUPPORTED 794PNG_EXTERN void png_push_handle_iTXt PNGARG((png_structp png_ptr, 795 png_infop info_ptr, png_uint_32 length)); 796PNG_EXTERN void png_push_read_iTXt PNGARG((png_structp png_ptr, 797 png_infop info_ptr)); 798#endif 799 800#endif /* PNG_PROGRESSIVE_READ_SUPPORTED */ 801 802#ifdef PNG_MNG_FEATURES_SUPPORTED 803PNG_EXTERN void png_do_read_intrapixel PNGARG((png_row_infop row_info, 804 png_bytep row)); 805PNG_EXTERN void png_do_write_intrapixel PNGARG((png_row_infop row_info, 806 png_bytep row)); 807#endif 808 809/* Added at libpng version 1.4.0 */ 810#ifdef PNG_cHRM_SUPPORTED 811PNG_EXTERN int png_check_cHRM_fixed PNGARG((png_structp png_ptr, 812 png_fixed_point int_white_x, png_fixed_point int_white_y, 813 png_fixed_point int_red_x, png_fixed_point int_red_y, png_fixed_point 814 int_green_x, png_fixed_point int_green_y, png_fixed_point int_blue_x, 815 png_fixed_point int_blue_y)); 816#endif 817 818#ifdef PNG_cHRM_SUPPORTED 819#ifdef PNG_CHECK_cHRM_SUPPORTED 820/* Added at libpng version 1.2.34 and 1.4.0 */ 821PNG_EXTERN void png_64bit_product PNGARG((long v1, long v2, 822 unsigned long *hi_product, unsigned long *lo_product)); 823#endif 824#endif 825 826/* Added at libpng version 1.4.0 */ 827PNG_EXTERN void png_check_IHDR PNGARG((png_structp png_ptr, 828 png_uint_32 width, png_uint_32 height, int bit_depth, 829 int color_type, int interlace_type, int compression_type, 830 int filter_type)); 831 832/* Free all memory used by the read (old method - NOT DLL EXPORTED) */ 833PNG_EXTERN void png_read_destroy PNGARG((png_structp png_ptr, png_infop info_ptr, 834 png_infop end_info_ptr)); 835 836/* Free any memory used in png_ptr struct (old method - NOT DLL EXPORTED) */ 837PNG_EXTERN void png_write_destroy PNGARG((png_structp png_ptr)); 838 839#ifdef USE_FAR_KEYWORD /* memory model conversion function */ 840PNG_EXTERN void *png_far_to_near PNGARG((png_structp png_ptr,png_voidp ptr, 841 int check)); 842#endif /* USE_FAR_KEYWORD */ 843 844/* Define PNG_DEBUG at compile time for debugging information. Higher 845 * numbers for PNG_DEBUG mean more debugging information. This has 846 * only been added since version 0.95 so it is not implemented throughout 847 * libpng yet, but more support will be added as needed. 848 */ 849#ifdef PNG_DEBUG 850#if (PNG_DEBUG > 0) 851#if !defined(PNG_DEBUG_FILE) && defined(_MSC_VER) 852#include <crtdbg.h> 853#if (PNG_DEBUG > 1) 854#ifndef _DEBUG 855# define _DEBUG 856#endif 857#ifndef png_debug 858#define png_debug(l,m) _RPT0(_CRT_WARN,m PNG_STRING_NEWLINE) 859#endif 860#ifndef png_debug1 861#define png_debug1(l,m,p1) _RPT1(_CRT_WARN,m PNG_STRING_NEWLINE,p1) 862#endif 863#ifndef png_debug2 864#define png_debug2(l,m,p1,p2) _RPT2(_CRT_WARN,m PNG_STRING_NEWLINE,p1,p2) 865#endif 866#endif 867#else /* PNG_DEBUG_FILE || !_MSC_VER */ 868#ifndef PNG_DEBUG_FILE 869#define PNG_DEBUG_FILE stderr 870#endif /* PNG_DEBUG_FILE */ 871 872#if (PNG_DEBUG > 1) 873/* Note: ["%s"m PNG_STRING_NEWLINE] probably does not work on 874 * non-ISO compilers 875 */ 876# ifdef __STDC__ 877# ifndef png_debug 878# define png_debug(l,m) \ 879 { \ 880 int num_tabs=l; \ 881 fprintf(PNG_DEBUG_FILE,"%s"m PNG_STRING_NEWLINE,(num_tabs==1 ? "\t" : \ 882 (num_tabs==2 ? "\t\t":(num_tabs>2 ? "\t\t\t":"")))); \ 883 } 884# endif 885# ifndef png_debug1 886# define png_debug1(l,m,p1) \ 887 { \ 888 int num_tabs=l; \ 889 fprintf(PNG_DEBUG_FILE,"%s"m PNG_STRING_NEWLINE,(num_tabs==1 ? "\t" : \ 890 (num_tabs==2 ? "\t\t":(num_tabs>2 ? "\t\t\t":""))),p1); \ 891 } 892# endif 893# ifndef png_debug2 894# define png_debug2(l,m,p1,p2) \ 895 { \ 896 int num_tabs=l; \ 897 fprintf(PNG_DEBUG_FILE,"%s"m PNG_STRING_NEWLINE,(num_tabs==1 ? "\t" : \ 898 (num_tabs==2 ? "\t\t":(num_tabs>2 ? "\t\t\t":""))),p1,p2); \ 899 } 900# endif 901# else /* __STDC __ */ 902# ifndef png_debug 903# define png_debug(l,m) \ 904 { \ 905 int num_tabs=l; \ 906 char format[256]; \ 907 snprintf(format,256,"%s%s%s",(num_tabs==1 ? "\t" : \ 908 (num_tabs==2 ? "\t\t":(num_tabs>2 ? "\t\t\t":""))), \ 909 m,PNG_STRING_NEWLINE); \ 910 fprintf(PNG_DEBUG_FILE,format); \ 911 } 912# endif 913# ifndef png_debug1 914# define png_debug1(l,m,p1) \ 915 { \ 916 int num_tabs=l; \ 917 char format[256]; \ 918 snprintf(format,256,"%s%s%s",(num_tabs==1 ? "\t" : \ 919 (num_tabs==2 ? "\t\t":(num_tabs>2 ? "\t\t\t":""))), \ 920 m,PNG_STRING_NEWLINE); \ 921 fprintf(PNG_DEBUG_FILE,format,p1); \ 922 } 923# endif 924# ifndef png_debug2 925# define png_debug2(l,m,p1,p2) \ 926 { \ 927 int num_tabs=l; \ 928 char format[256]; \ 929 snprintf(format,256,"%s%s%s",(num_tabs==1 ? "\t" : \ 930 (num_tabs==2 ? "\t\t":(num_tabs>2 ? "\t\t\t":""))), \ 931 m,PNG_STRING_NEWLINE); \ 932 fprintf(PNG_DEBUG_FILE,format,p1,p2); \ 933 } 934# endif 935# endif /* __STDC __ */ 936#endif /* (PNG_DEBUG > 1) */ 937 938#endif /* _MSC_VER */ 939#endif /* (PNG_DEBUG > 0) */ 940#endif /* PNG_DEBUG */ 941#ifndef png_debug 942#define png_debug(l, m) 943#endif 944#ifndef png_debug1 945#define png_debug1(l, m, p1) 946#endif 947#ifndef png_debug2 948#define png_debug2(l, m, p1, p2) 949#endif 950 951/* Maintainer: Put new private prototypes here ^ and in libpngpf.3 */ 952 953#ifdef __cplusplus 954} 955#endif 956 957#endif /* PNG_VERSION_INFO_ONLY */ 958#endif /* PNGPRIV_H */ 959