1 2 /* pngstruct.h - header file for PNG reference library 3 * 4 * Last changed in libpng 1.6.18 [July 23, 2015] 5 * Copyright (c) 1998-2015 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 * This code is released under the libpng license. 10 * For conditions of distribution and use, see the disclaimer 11 * and license in png.h 12 */ 13 14 /* The structure that holds the information to read and write PNG files. 15 * The only people who need to care about what is inside of this are the 16 * people who will be modifying the library for their own special needs. 17 * It should NOT be accessed directly by an application. 18 */ 19 20 #ifndef PNGSTRUCT_H 21 #define PNGSTRUCT_H 22 /* zlib.h defines the structure z_stream, an instance of which is included 23 * in this structure and is required for decompressing the LZ compressed 24 * data in PNG files. 25 */ 26 #ifndef ZLIB_CONST 27 /* We must ensure that zlib uses 'const' in declarations. */ 28 # define ZLIB_CONST 29 #endif 30 #include "zlib.h" 31 #ifdef const 32 /* zlib.h sometimes #defines const to nothing, undo this. */ 33 # undef const 34 #endif 35 36 /* zlib.h has mediocre z_const use before 1.2.6, this stuff is for compatibility 37 * with older builds. 38 */ 39 #if ZLIB_VERNUM < 0x1260 40 # define PNGZ_MSG_CAST(s) png_constcast(char*,s) 41 # define PNGZ_INPUT_CAST(b) png_constcast(png_bytep,b) 42 #else 43 # define PNGZ_MSG_CAST(s) (s) 44 # define PNGZ_INPUT_CAST(b) (b) 45 #endif 46 47 /* zlib.h declares a magic type 'uInt' that limits the amount of data that zlib 48 * can handle at once. This type need be no larger than 16 bits (so maximum of 49 * 65535), this define allows us to discover how big it is, but limited by the 50 * maximuum for png_size_t. The value can be overriden in a library build 51 * (pngusr.h, or set it in CPPFLAGS) and it works to set it to a considerably 52 * lower value (e.g. 255 works). A lower value may help memory usage (slightly) 53 * and may even improve performance on some systems (and degrade it on others.) 54 */ 55 #ifndef ZLIB_IO_MAX 56 # define ZLIB_IO_MAX ((uInt)-1) 57 #endif 58 59 #ifdef PNG_WRITE_SUPPORTED 60 /* The type of a compression buffer list used by the write code. */ 61 typedef struct png_compression_buffer 62 { 63 struct png_compression_buffer *next; 64 png_byte output[1]; /* actually zbuf_size */ 65 } png_compression_buffer, *png_compression_bufferp; 66 67 #define PNG_COMPRESSION_BUFFER_SIZE(pp)\ 68 (offsetof(png_compression_buffer, output) + (pp)->zbuffer_size) 69 #endif 70 71 /* Colorspace support; structures used in png_struct, png_info and in internal 72 * functions to hold and communicate information about the color space. 73 * 74 * PNG_COLORSPACE_SUPPORTED is only required if the application will perform 75 * colorspace corrections, otherwise all the colorspace information can be 76 * skipped and the size of libpng can be reduced (significantly) by compiling 77 * out the colorspace support. 78 */ 79 #ifdef PNG_COLORSPACE_SUPPORTED 80 /* The chromaticities of the red, green and blue colorants and the chromaticity 81 * of the corresponding white point (i.e. of rgb(1.0,1.0,1.0)). 82 */ 83 typedef struct png_xy 84 { 85 png_fixed_point redx, redy; 86 png_fixed_point greenx, greeny; 87 png_fixed_point bluex, bluey; 88 png_fixed_point whitex, whitey; 89 } png_xy; 90 91 /* The same data as above but encoded as CIE XYZ values. When this data comes 92 * from chromaticities the sum of the Y values is assumed to be 1.0 93 */ 94 typedef struct png_XYZ 95 { 96 png_fixed_point red_X, red_Y, red_Z; 97 png_fixed_point green_X, green_Y, green_Z; 98 png_fixed_point blue_X, blue_Y, blue_Z; 99 } png_XYZ; 100 #endif /* COLORSPACE */ 101 102 #if defined(PNG_COLORSPACE_SUPPORTED) || defined(PNG_GAMMA_SUPPORTED) 103 /* A colorspace is all the above plus, potentially, profile information; 104 * however at present libpng does not use the profile internally so it is only 105 * stored in the png_info struct (if iCCP is supported.) The rendering intent 106 * is retained here and is checked. 107 * 108 * The file gamma encoding information is also stored here and gamma correction 109 * is done by libpng, whereas color correction must currently be done by the 110 * application. 111 */ 112 typedef struct png_colorspace 113 { 114 #ifdef PNG_GAMMA_SUPPORTED 115 png_fixed_point gamma; /* File gamma */ 116 #endif 117 118 #ifdef PNG_COLORSPACE_SUPPORTED 119 png_xy end_points_xy; /* End points as chromaticities */ 120 png_XYZ end_points_XYZ; /* End points as CIE XYZ colorant values */ 121 png_uint_16 rendering_intent; /* Rendering intent of a profile */ 122 #endif 123 124 /* Flags are always defined to simplify the code. */ 125 png_uint_16 flags; /* As defined below */ 126 } png_colorspace, * PNG_RESTRICT png_colorspacerp; 127 128 typedef const png_colorspace * PNG_RESTRICT png_const_colorspacerp; 129 130 /* General flags for the 'flags' field */ 131 #define PNG_COLORSPACE_HAVE_GAMMA 0x0001 132 #define PNG_COLORSPACE_HAVE_ENDPOINTS 0x0002 133 #define PNG_COLORSPACE_HAVE_INTENT 0x0004 134 #define PNG_COLORSPACE_FROM_gAMA 0x0008 135 #define PNG_COLORSPACE_FROM_cHRM 0x0010 136 #define PNG_COLORSPACE_FROM_sRGB 0x0020 137 #define PNG_COLORSPACE_ENDPOINTS_MATCH_sRGB 0x0040 138 #define PNG_COLORSPACE_MATCHES_sRGB 0x0080 /* exact match on profile */ 139 #define PNG_COLORSPACE_INVALID 0x8000 140 #define PNG_COLORSPACE_CANCEL(flags) (0xffff ^ (flags)) 141 #endif /* COLORSPACE || GAMMA */ 142 143 #ifdef PNG_INDEX_SUPPORTED 144 /* png_line_index_struct records an index point, where we impose an index point 145 * to be located at the beginning of a line for simplifying the implementation. 146 */ 147 typedef struct png_line_index_struct 148 { 149 // state of the lz decoder 150 z_streamp z_state; 151 152 // the IDAT header position of the chunk, which the index point is in 153 png_uint_32 stream_idat_position; 154 155 // we intend to record the offset of the index point in the chunk, 156 // but we record the number of remaining bytes in the chunk after the 157 // index point. That's because PNG processes a chunk this way. 158 png_uint_32 bytes_left_in_idat; 159 160 // decompressed data of the previous row 161 png_bytep prev_row; 162 } png_line_index; 163 typedef png_line_index FAR * png_line_indexp; 164 165 typedef struct png_index_struct 166 { 167 // A temporary variable used when we build the index. The variable records 168 // the IDAT header position of the last chunk read in so far. 169 png_uint_32 stream_idat_position; 170 171 // line index information about each passes 172 173 // the number of index points in each pass 174 png_uint_32 size[7]; 175 176 // the line span of two index points of each pass 177 png_uint_32 step[7]; 178 179 // the index points of each pass 180 png_line_indexp *pass_line_index[7]; 181 } png_index; 182 typedef png_index FAR * png_indexp; 183 184 #define INDEX_SAMPLE_SIZE 254 185 #endif 186 187 struct png_struct_def 188 { 189 #ifdef PNG_SETJMP_SUPPORTED 190 jmp_buf jmp_buf_local; /* New name in 1.6.0 for jmp_buf in png_struct */ 191 png_longjmp_ptr longjmp_fn;/* setjmp non-local goto function. */ 192 jmp_buf *jmp_buf_ptr; /* passed to longjmp_fn */ 193 size_t jmp_buf_size; /* size of the above, if allocated */ 194 #endif 195 png_error_ptr error_fn; /* function for printing errors and aborting */ 196 #ifdef PNG_WARNINGS_SUPPORTED 197 png_error_ptr warning_fn; /* function for printing warnings */ 198 #endif 199 png_voidp error_ptr; /* user supplied struct for error functions */ 200 png_rw_ptr write_data_fn; /* function for writing output data */ 201 png_rw_ptr read_data_fn; /* function for reading input data */ 202 #ifdef PNG_INDEX_SUPPORTED 203 png_seek_ptr seek_data_fn; /* function for seeking input data */ 204 #endif 205 png_voidp io_ptr; /* ptr to application struct for I/O functions */ 206 207 #ifdef PNG_READ_USER_TRANSFORM_SUPPORTED 208 png_user_transform_ptr read_user_transform_fn; /* user read transform */ 209 #endif 210 211 #ifdef PNG_WRITE_USER_TRANSFORM_SUPPORTED 212 png_user_transform_ptr write_user_transform_fn; /* user write transform */ 213 #endif 214 215 /* These were added in libpng-1.0.2 */ 216 #ifdef PNG_USER_TRANSFORM_PTR_SUPPORTED 217 #if defined(PNG_READ_USER_TRANSFORM_SUPPORTED) || \ 218 defined(PNG_WRITE_USER_TRANSFORM_SUPPORTED) 219 png_voidp user_transform_ptr; /* user supplied struct for user transform */ 220 png_byte user_transform_depth; /* bit depth of user transformed pixels */ 221 png_byte user_transform_channels; /* channels in user transformed pixels */ 222 #endif 223 #endif 224 225 png_uint_32 mode; /* tells us where we are in the PNG file */ 226 png_uint_32 flags; /* flags indicating various things to libpng */ 227 png_uint_32 transformations; /* which transformations to perform */ 228 229 png_uint_32 zowner; /* ID (chunk type) of zstream owner, 0 if none */ 230 z_stream zstream; /* decompression structure */ 231 232 #ifdef PNG_WRITE_SUPPORTED 233 png_compression_bufferp zbuffer_list; /* Created on demand during write */ 234 uInt zbuffer_size; /* size of the actual buffer */ 235 236 int zlib_level; /* holds zlib compression level */ 237 int zlib_method; /* holds zlib compression method */ 238 int zlib_window_bits; /* holds zlib compression window bits */ 239 int zlib_mem_level; /* holds zlib compression memory level */ 240 int zlib_strategy; /* holds zlib compression strategy */ 241 #endif 242 /* Added at libpng 1.5.4 */ 243 #ifdef PNG_WRITE_CUSTOMIZE_ZTXT_COMPRESSION_SUPPORTED 244 int zlib_text_level; /* holds zlib compression level */ 245 int zlib_text_method; /* holds zlib compression method */ 246 int zlib_text_window_bits; /* holds zlib compression window bits */ 247 int zlib_text_mem_level; /* holds zlib compression memory level */ 248 int zlib_text_strategy; /* holds zlib compression strategy */ 249 #endif 250 /* End of material added at libpng 1.5.4 */ 251 /* Added at libpng 1.6.0 */ 252 #ifdef PNG_WRITE_SUPPORTED 253 int zlib_set_level; /* Actual values set into the zstream on write */ 254 int zlib_set_method; 255 int zlib_set_window_bits; 256 int zlib_set_mem_level; 257 int zlib_set_strategy; 258 #endif 259 260 png_uint_32 width; /* width of image in pixels */ 261 png_uint_32 height; /* height of image in pixels */ 262 png_uint_32 num_rows; /* number of rows in current pass */ 263 png_uint_32 usr_width; /* width of row at start of write */ 264 png_size_t rowbytes; /* size of row in bytes */ 265 png_uint_32 iwidth; /* width of current interlaced row in pixels */ 266 png_uint_32 row_number; /* current row in interlace pass */ 267 png_uint_32 chunk_name; /* PNG_CHUNK() id of current chunk */ 268 png_bytep prev_row; /* buffer to save previous (unfiltered) row. 269 * While reading this is a pointer into 270 * big_prev_row; while writing it is separately 271 * allocated if needed. 272 */ 273 png_bytep row_buf; /* buffer to save current (unfiltered) row. 274 * While reading, this is a pointer into 275 * big_row_buf; while writing it is separately 276 * allocated. 277 */ 278 #ifdef PNG_WRITE_FILTER_SUPPORTED 279 png_bytep try_row; /* buffer to save trial row when filtering */ 280 png_bytep tst_row; /* buffer to save best trial row when filtering */ 281 #endif 282 png_size_t info_rowbytes; /* Added in 1.5.4: cache of updated row bytes */ 283 284 png_uint_32 idat_size; /* current IDAT size for read */ 285 png_uint_32 crc; /* current chunk CRC value */ 286 png_colorp palette; /* palette from the input file */ 287 png_uint_16 num_palette; /* number of color entries in palette */ 288 289 /* Added at libpng-1.5.10 */ 290 #ifdef PNG_CHECK_FOR_INVALID_INDEX_SUPPORTED 291 int num_palette_max; /* maximum palette index found in IDAT */ 292 #endif 293 294 png_uint_16 num_trans; /* number of transparency values */ 295 png_byte compression; /* file compression type (always 0) */ 296 png_byte filter; /* file filter type (always 0) */ 297 png_byte interlaced; /* PNG_INTERLACE_NONE, PNG_INTERLACE_ADAM7 */ 298 png_byte pass; /* current interlace pass (0 - 6) */ 299 png_byte do_filter; /* row filter flags (see PNG_FILTER_ below ) */ 300 png_byte color_type; /* color type of file */ 301 png_byte bit_depth; /* bit depth of file */ 302 png_byte usr_bit_depth; /* bit depth of users row: write only */ 303 png_byte pixel_depth; /* number of bits per pixel */ 304 png_byte channels; /* number of channels in file */ 305 #ifdef PNG_WRITE_SUPPORTED 306 png_byte usr_channels; /* channels at start of write: write only */ 307 #endif 308 png_byte sig_bytes; /* magic bytes read/written from start of file */ 309 png_byte maximum_pixel_depth; 310 /* pixel depth used for the row buffers */ 311 png_byte transformed_pixel_depth; 312 /* pixel depth after read/write transforms */ 313 #if PNG_ZLIB_VERNUM >= 0x1240 314 png_byte zstream_start; /* at start of an input zlib stream */ 315 #endif /* Zlib >= 1.2.4 */ 316 #if defined(PNG_READ_FILLER_SUPPORTED) || defined(PNG_WRITE_FILLER_SUPPORTED) 317 png_uint_16 filler; /* filler bytes for pixel expansion */ 318 #endif 319 320 #if defined(PNG_bKGD_SUPPORTED) || defined(PNG_READ_BACKGROUND_SUPPORTED) ||\ 321 defined(PNG_READ_ALPHA_MODE_SUPPORTED) 322 png_byte background_gamma_type; 323 png_fixed_point background_gamma; 324 png_color_16 background; /* background color in screen gamma space */ 325 #ifdef PNG_READ_GAMMA_SUPPORTED 326 png_color_16 background_1; /* background normalized to gamma 1.0 */ 327 #endif 328 #endif /* bKGD */ 329 330 #ifdef PNG_WRITE_FLUSH_SUPPORTED 331 png_flush_ptr output_flush_fn; /* Function for flushing output */ 332 png_uint_32 flush_dist; /* how many rows apart to flush, 0 - no flush */ 333 png_uint_32 flush_rows; /* number of rows written since last flush */ 334 #endif 335 336 #ifdef PNG_READ_GAMMA_SUPPORTED 337 int gamma_shift; /* number of "insignificant" bits in 16-bit gamma */ 338 png_fixed_point screen_gamma; /* screen gamma value (display_exponent) */ 339 340 png_bytep gamma_table; /* gamma table for 8-bit depth files */ 341 png_uint_16pp gamma_16_table; /* gamma table for 16-bit depth files */ 342 #if defined(PNG_READ_BACKGROUND_SUPPORTED) || \ 343 defined(PNG_READ_ALPHA_MODE_SUPPORTED) || \ 344 defined(PNG_READ_RGB_TO_GRAY_SUPPORTED) 345 png_bytep gamma_from_1; /* converts from 1.0 to screen */ 346 png_bytep gamma_to_1; /* converts from file to 1.0 */ 347 png_uint_16pp gamma_16_from_1; /* converts from 1.0 to screen */ 348 png_uint_16pp gamma_16_to_1; /* converts from file to 1.0 */ 349 #endif /* READ_BACKGROUND || READ_ALPHA_MODE || RGB_TO_GRAY */ 350 #endif 351 352 #if defined(PNG_READ_GAMMA_SUPPORTED) || defined(PNG_sBIT_SUPPORTED) 353 png_color_8 sig_bit; /* significant bits in each available channel */ 354 #endif 355 356 #if defined(PNG_READ_SHIFT_SUPPORTED) || defined(PNG_WRITE_SHIFT_SUPPORTED) 357 png_color_8 shift; /* shift for significant bit tranformation */ 358 #endif 359 360 #if defined(PNG_tRNS_SUPPORTED) || defined(PNG_READ_BACKGROUND_SUPPORTED) \ 361 || defined(PNG_READ_EXPAND_SUPPORTED) || defined(PNG_READ_BACKGROUND_SUPPORTED) 362 png_bytep trans_alpha; /* alpha values for paletted files */ 363 png_color_16 trans_color; /* transparent color for non-paletted files */ 364 #endif 365 366 png_read_status_ptr read_row_fn; /* called after each row is decoded */ 367 png_write_status_ptr write_row_fn; /* called after each row is encoded */ 368 #ifdef PNG_PROGRESSIVE_READ_SUPPORTED 369 png_progressive_info_ptr info_fn; /* called after header data fully read */ 370 png_progressive_row_ptr row_fn; /* called after a prog. row is decoded */ 371 png_progressive_end_ptr end_fn; /* called after image is complete */ 372 png_bytep save_buffer_ptr; /* current location in save_buffer */ 373 png_bytep save_buffer; /* buffer for previously read data */ 374 png_bytep current_buffer_ptr; /* current location in current_buffer */ 375 png_bytep current_buffer; /* buffer for recently used data */ 376 png_uint_32 push_length; /* size of current input chunk */ 377 png_uint_32 skip_length; /* bytes to skip in input data */ 378 png_size_t save_buffer_size; /* amount of data now in save_buffer */ 379 png_size_t save_buffer_max; /* total size of save_buffer */ 380 png_size_t buffer_size; /* total amount of available input data */ 381 png_size_t current_buffer_size; /* amount of data now in current_buffer */ 382 int process_mode; /* what push library is currently doing */ 383 int cur_palette; /* current push library palette index */ 384 385 #endif /* PROGRESSIVE_READ */ 386 387 #if defined(__TURBOC__) && !defined(_Windows) && !defined(__FLAT__) 388 /* For the Borland special 64K segment handler */ 389 png_bytepp offset_table_ptr; 390 png_bytep offset_table; 391 png_uint_16 offset_table_number; 392 png_uint_16 offset_table_count; 393 png_uint_16 offset_table_count_free; 394 #endif 395 396 #ifdef PNG_READ_QUANTIZE_SUPPORTED 397 png_bytep palette_lookup; /* lookup table for quantizing */ 398 png_bytep quantize_index; /* index translation for palette files */ 399 #endif 400 401 /* Options */ 402 #ifdef PNG_SET_OPTION_SUPPORTED 403 png_byte options; /* On/off state (up to 4 options) */ 404 #endif 405 406 #if PNG_LIBPNG_VER < 10700 407 /* To do: remove this from libpng-1.7 */ 408 #ifdef PNG_TIME_RFC1123_SUPPORTED 409 char time_buffer[29]; /* String to hold RFC 1123 time text */ 410 #endif 411 #endif 412 413 /* New members added in libpng-1.0.6 */ 414 415 png_uint_32 free_me; /* flags items libpng is responsible for freeing */ 416 417 #ifdef PNG_USER_CHUNKS_SUPPORTED 418 png_voidp user_chunk_ptr; 419 #ifdef PNG_READ_USER_CHUNKS_SUPPORTED 420 png_user_chunk_ptr read_user_chunk_fn; /* user read chunk handler */ 421 #endif 422 #endif 423 424 #ifdef PNG_SET_UNKNOWN_CHUNKS_SUPPORTED 425 int unknown_default; /* As PNG_HANDLE_* */ 426 unsigned int num_chunk_list; /* Number of entries in the list */ 427 png_bytep chunk_list; /* List of png_byte[5]; the textual chunk name 428 * followed by a PNG_HANDLE_* byte */ 429 #endif 430 431 /* New members added in libpng-1.0.3 */ 432 #ifdef PNG_READ_RGB_TO_GRAY_SUPPORTED 433 png_byte rgb_to_gray_status; 434 /* Added in libpng 1.5.5 to record setting of coefficients: */ 435 png_byte rgb_to_gray_coefficients_set; 436 /* These were changed from png_byte in libpng-1.0.6 */ 437 png_uint_16 rgb_to_gray_red_coeff; 438 png_uint_16 rgb_to_gray_green_coeff; 439 /* deleted in 1.5.5: rgb_to_gray_blue_coeff; */ 440 #endif 441 442 /* New member added in libpng-1.0.4 (renamed in 1.0.9) */ 443 #if defined(PNG_MNG_FEATURES_SUPPORTED) 444 /* Changed from png_byte to png_uint_32 at version 1.2.0 */ 445 png_uint_32 mng_features_permitted; 446 #endif 447 448 /* New member added in libpng-1.0.9, ifdef'ed out in 1.0.12, enabled in 1.2.0 */ 449 #ifdef PNG_MNG_FEATURES_SUPPORTED 450 png_byte filter_type; 451 #endif 452 453 /* New members added in libpng-1.2.0 */ 454 455 /* New members added in libpng-1.0.2 but first enabled by default in 1.2.0 */ 456 #ifdef PNG_USER_MEM_SUPPORTED 457 png_voidp mem_ptr; /* user supplied struct for mem functions */ 458 png_malloc_ptr malloc_fn; /* function for allocating memory */ 459 png_free_ptr free_fn; /* function for freeing memory */ 460 #endif 461 462 /* New member added in libpng-1.0.13 and 1.2.0 */ 463 png_bytep big_row_buf; /* buffer to save current (unfiltered) row */ 464 465 #ifdef PNG_READ_QUANTIZE_SUPPORTED 466 /* The following three members were added at version 1.0.14 and 1.2.4 */ 467 png_bytep quantize_sort; /* working sort array */ 468 png_bytep index_to_palette; /* where the original index currently is 469 in the palette */ 470 png_bytep palette_to_index; /* which original index points to this 471 palette color */ 472 #endif 473 474 /* New members added in libpng-1.0.16 and 1.2.6 */ 475 png_byte compression_type; 476 477 #ifdef PNG_USER_LIMITS_SUPPORTED 478 png_uint_32 user_width_max; 479 png_uint_32 user_height_max; 480 481 /* Added in libpng-1.4.0: Total number of sPLT, text, and unknown 482 * chunks that can be stored (0 means unlimited). 483 */ 484 png_uint_32 user_chunk_cache_max; 485 486 /* Total memory that a zTXt, sPLT, iTXt, iCCP, or unknown chunk 487 * can occupy when decompressed. 0 means unlimited. 488 */ 489 png_alloc_size_t user_chunk_malloc_max; 490 #endif 491 492 /* New member added in libpng-1.0.25 and 1.2.17 */ 493 #ifdef PNG_READ_UNKNOWN_CHUNKS_SUPPORTED 494 /* Temporary storage for unknown chunk that the library doesn't recognize, 495 * used while reading the chunk. 496 */ 497 png_unknown_chunk unknown_chunk; 498 #endif 499 500 /* New member added in libpng-1.2.26 */ 501 png_size_t old_big_row_buf_size; 502 503 #ifdef PNG_READ_SUPPORTED 504 /* New member added in libpng-1.2.30 */ 505 png_bytep read_buffer; /* buffer for reading chunk data */ 506 png_alloc_size_t read_buffer_size; /* current size of the buffer */ 507 #endif 508 #ifdef PNG_SEQUENTIAL_READ_SUPPORTED 509 uInt IDAT_read_size; /* limit on read buffer size for IDAT */ 510 #endif 511 512 #ifdef PNG_IO_STATE_SUPPORTED 513 /* New member added in libpng-1.4.0 */ 514 png_uint_32 io_state; 515 #endif 516 517 /* New member added in libpng-1.5.6 */ 518 png_bytep big_prev_row; 519 520 /* New member added in libpng-1.5.7 */ 521 void (*read_filter[PNG_FILTER_VALUE_LAST-1])(png_row_infop row_info, 522 png_bytep row, png_const_bytep prev_row); 523 524 #ifdef PNG_READ_SUPPORTED 525 #if defined(PNG_COLORSPACE_SUPPORTED) || defined(PNG_GAMMA_SUPPORTED) 526 png_colorspace colorspace; 527 #endif 528 #endif 529 530 #ifdef PNG_INDEX_SUPPORTED 531 png_indexp index; 532 png_uint_32 total_data_read; 533 #endif 534 535 }; 536 #endif /* PNGSTRUCT_H */ 537