1 /* 2 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 3 * 4 * This code is free software; you can redistribute it and/or modify it 5 * under the terms of the GNU General Public License version 2 only, as 6 * published by the Free Software Foundation. Oracle designates this 7 * particular file as subject to the "Classpath" exception as provided 8 * by Oracle in the LICENSE file that accompanied this code. 9 * 10 * This code is distributed in the hope that it will be useful, but WITHOUT 11 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 12 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 13 * version 2 for more details (a copy is included in the LICENSE file that 14 * accompanied this code). 15 * 16 * You should have received a copy of the GNU General Public License version 17 * 2 along with this work; if not, write to the Free Software Foundation, 18 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 19 * 20 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 21 * or visit www.oracle.com if you need additional information or have any 22 * questions. 23 */ 24 25 /* pngstruct.h - header file for PNG reference library 26 * 27 * Copyright (c) 2018-2019 Cosmin Truta 28 * Copyright (c) 1998-2002,2004,2006-2018 Glenn Randers-Pehrson 29 * Copyright (c) 1996-1997 Andreas Dilger 30 * Copyright (c) 1995-1996 Guy Eric Schalnat, Group 42, Inc. 31 * 32 * This code is released under the libpng license. 33 * For conditions of distribution and use, see the disclaimer 34 * and license in png.h 35 */ 36 37 /* The structure that holds the information to read and write PNG files. 38 * The only people who need to care about what is inside of this are the 39 * people who will be modifying the library for their own special needs. 40 * It should NOT be accessed directly by an application. 41 */ 42 43 #ifndef PNGSTRUCT_H 44 #define PNGSTRUCT_H 45 /* zlib.h defines the structure z_stream, an instance of which is included 46 * in this structure and is required for decompressing the LZ compressed 47 * data in PNG files. 48 */ 49 #ifndef ZLIB_CONST 50 /* We must ensure that zlib uses 'const' in declarations. */ 51 # define ZLIB_CONST 52 #endif 53 #include "zlib.h" 54 #ifdef const 55 /* zlib.h sometimes #defines const to nothing, undo this. */ 56 # undef const 57 #endif 58 59 /* zlib.h has mediocre z_const use before 1.2.6, this stuff is for compatibility 60 * with older builds. 61 */ 62 #if ZLIB_VERNUM < 0x1260 63 # define PNGZ_MSG_CAST(s) png_constcast(char*,s) 64 # define PNGZ_INPUT_CAST(b) png_constcast(png_bytep,b) 65 #else 66 # define PNGZ_MSG_CAST(s) (s) 67 # define PNGZ_INPUT_CAST(b) (b) 68 #endif 69 70 /* zlib.h declares a magic type 'uInt' that limits the amount of data that zlib 71 * can handle at once. This type need be no larger than 16 bits (so maximum of 72 * 65535), this define allows us to discover how big it is, but limited by the 73 * maximum for size_t. The value can be overridden in a library build 74 * (pngusr.h, or set it in CPPFLAGS) and it works to set it to a considerably 75 * lower value (e.g. 255 works). A lower value may help memory usage (slightly) 76 * and may even improve performance on some systems (and degrade it on others.) 77 */ 78 #ifndef ZLIB_IO_MAX 79 # define ZLIB_IO_MAX ((uInt)-1) 80 #endif 81 82 #ifdef PNG_WRITE_SUPPORTED 83 /* The type of a compression buffer list used by the write code. */ 84 typedef struct png_compression_buffer 85 { 86 struct png_compression_buffer *next; 87 png_byte output[1]; /* actually zbuf_size */ 88 } png_compression_buffer, *png_compression_bufferp; 89 90 #define PNG_COMPRESSION_BUFFER_SIZE(pp)\ 91 (offsetof(png_compression_buffer, output) + (pp)->zbuffer_size) 92 #endif 93 94 /* Colorspace support; structures used in png_struct, png_info and in internal 95 * functions to hold and communicate information about the color space. 96 * 97 * PNG_COLORSPACE_SUPPORTED is only required if the application will perform 98 * colorspace corrections, otherwise all the colorspace information can be 99 * skipped and the size of libpng can be reduced (significantly) by compiling 100 * out the colorspace support. 101 */ 102 #ifdef PNG_COLORSPACE_SUPPORTED 103 /* The chromaticities of the red, green and blue colorants and the chromaticity 104 * of the corresponding white point (i.e. of rgb(1.0,1.0,1.0)). 105 */ 106 typedef struct png_xy 107 { 108 png_fixed_point redx, redy; 109 png_fixed_point greenx, greeny; 110 png_fixed_point bluex, bluey; 111 png_fixed_point whitex, whitey; 112 } png_xy; 113 114 /* The same data as above but encoded as CIE XYZ values. When this data comes 115 * from chromaticities the sum of the Y values is assumed to be 1.0 116 */ 117 typedef struct png_XYZ 118 { 119 png_fixed_point red_X, red_Y, red_Z; 120 png_fixed_point green_X, green_Y, green_Z; 121 png_fixed_point blue_X, blue_Y, blue_Z; 122 } png_XYZ; 123 #endif /* COLORSPACE */ 124 125 #if defined(PNG_COLORSPACE_SUPPORTED) || defined(PNG_GAMMA_SUPPORTED) 126 /* A colorspace is all the above plus, potentially, profile information; 127 * however at present libpng does not use the profile internally so it is only 128 * stored in the png_info struct (if iCCP is supported.) The rendering intent 129 * is retained here and is checked. 130 * 131 * The file gamma encoding information is also stored here and gamma correction 132 * is done by libpng, whereas color correction must currently be done by the 133 * application. 134 */ 135 typedef struct png_colorspace 136 { 137 #ifdef PNG_GAMMA_SUPPORTED 138 png_fixed_point gamma; /* File gamma */ 139 #endif 140 141 #ifdef PNG_COLORSPACE_SUPPORTED 142 png_xy end_points_xy; /* End points as chromaticities */ 143 png_XYZ end_points_XYZ; /* End points as CIE XYZ colorant values */ 144 png_uint_16 rendering_intent; /* Rendering intent of a profile */ 145 #endif 146 147 /* Flags are always defined to simplify the code. */ 148 png_uint_16 flags; /* As defined below */ 149 } png_colorspace, * PNG_RESTRICT png_colorspacerp; 150 151 typedef const png_colorspace * PNG_RESTRICT png_const_colorspacerp; 152 153 /* General flags for the 'flags' field */ 154 #define PNG_COLORSPACE_HAVE_GAMMA 0x0001 155 #define PNG_COLORSPACE_HAVE_ENDPOINTS 0x0002 156 #define PNG_COLORSPACE_HAVE_INTENT 0x0004 157 #define PNG_COLORSPACE_FROM_gAMA 0x0008 158 #define PNG_COLORSPACE_FROM_cHRM 0x0010 159 #define PNG_COLORSPACE_FROM_sRGB 0x0020 160 #define PNG_COLORSPACE_ENDPOINTS_MATCH_sRGB 0x0040 161 #define PNG_COLORSPACE_MATCHES_sRGB 0x0080 /* exact match on profile */ 162 #define PNG_COLORSPACE_INVALID 0x8000 163 #define PNG_COLORSPACE_CANCEL(flags) (0xffff ^ (flags)) 164 #endif /* COLORSPACE || GAMMA */ 165 166 struct png_struct_def 167 { 168 #ifdef PNG_SETJMP_SUPPORTED 169 jmp_buf jmp_buf_local; /* New name in 1.6.0 for jmp_buf in png_struct */ 170 png_longjmp_ptr longjmp_fn;/* setjmp non-local goto function. */ 171 jmp_buf *jmp_buf_ptr; /* passed to longjmp_fn */ 172 size_t jmp_buf_size; /* size of the above, if allocated */ 173 #endif 174 png_error_ptr error_fn; /* function for printing errors and aborting */ 175 #ifdef PNG_WARNINGS_SUPPORTED 176 png_error_ptr warning_fn; /* function for printing warnings */ 177 #endif 178 png_voidp error_ptr; /* user supplied struct for error functions */ 179 png_rw_ptr write_data_fn; /* function for writing output data */ 180 png_rw_ptr read_data_fn; /* function for reading input data */ 181 png_voidp io_ptr; /* ptr to application struct for I/O functions */ 182 183 #ifdef PNG_READ_USER_TRANSFORM_SUPPORTED 184 png_user_transform_ptr read_user_transform_fn; /* user read transform */ 185 #endif 186 187 #ifdef PNG_WRITE_USER_TRANSFORM_SUPPORTED 188 png_user_transform_ptr write_user_transform_fn; /* user write transform */ 189 #endif 190 191 /* These were added in libpng-1.0.2 */ 192 #ifdef PNG_USER_TRANSFORM_PTR_SUPPORTED 193 #if defined(PNG_READ_USER_TRANSFORM_SUPPORTED) || \ 194 defined(PNG_WRITE_USER_TRANSFORM_SUPPORTED) 195 png_voidp user_transform_ptr; /* user supplied struct for user transform */ 196 png_byte user_transform_depth; /* bit depth of user transformed pixels */ 197 png_byte user_transform_channels; /* channels in user transformed pixels */ 198 #endif 199 #endif 200 201 png_uint_32 mode; /* tells us where we are in the PNG file */ 202 png_uint_32 flags; /* flags indicating various things to libpng */ 203 png_uint_32 transformations; /* which transformations to perform */ 204 205 png_uint_32 zowner; /* ID (chunk type) of zstream owner, 0 if none */ 206 z_stream zstream; /* decompression structure */ 207 208 #ifdef PNG_WRITE_SUPPORTED 209 png_compression_bufferp zbuffer_list; /* Created on demand during write */ 210 uInt zbuffer_size; /* size of the actual buffer */ 211 212 int zlib_level; /* holds zlib compression level */ 213 int zlib_method; /* holds zlib compression method */ 214 int zlib_window_bits; /* holds zlib compression window bits */ 215 int zlib_mem_level; /* holds zlib compression memory level */ 216 int zlib_strategy; /* holds zlib compression strategy */ 217 #endif 218 /* Added at libpng 1.5.4 */ 219 #ifdef PNG_WRITE_CUSTOMIZE_ZTXT_COMPRESSION_SUPPORTED 220 int zlib_text_level; /* holds zlib compression level */ 221 int zlib_text_method; /* holds zlib compression method */ 222 int zlib_text_window_bits; /* holds zlib compression window bits */ 223 int zlib_text_mem_level; /* holds zlib compression memory level */ 224 int zlib_text_strategy; /* holds zlib compression strategy */ 225 #endif 226 /* End of material added at libpng 1.5.4 */ 227 /* Added at libpng 1.6.0 */ 228 #ifdef PNG_WRITE_SUPPORTED 229 int zlib_set_level; /* Actual values set into the zstream on write */ 230 int zlib_set_method; 231 int zlib_set_window_bits; 232 int zlib_set_mem_level; 233 int zlib_set_strategy; 234 #endif 235 236 png_uint_32 width; /* width of image in pixels */ 237 png_uint_32 height; /* height of image in pixels */ 238 png_uint_32 num_rows; /* number of rows in current pass */ 239 png_uint_32 usr_width; /* width of row at start of write */ 240 size_t rowbytes; /* size of row in bytes */ 241 png_uint_32 iwidth; /* width of current interlaced row in pixels */ 242 png_uint_32 row_number; /* current row in interlace pass */ 243 png_uint_32 chunk_name; /* PNG_CHUNK() id of current chunk */ 244 png_bytep prev_row; /* buffer to save previous (unfiltered) row. 245 * While reading this is a pointer into 246 * big_prev_row; while writing it is separately 247 * allocated if needed. 248 */ 249 png_bytep row_buf; /* buffer to save current (unfiltered) row. 250 * While reading, this is a pointer into 251 * big_row_buf; while writing it is separately 252 * allocated. 253 */ 254 #ifdef PNG_WRITE_FILTER_SUPPORTED 255 png_bytep try_row; /* buffer to save trial row when filtering */ 256 png_bytep tst_row; /* buffer to save best trial row when filtering */ 257 #endif 258 size_t info_rowbytes; /* Added in 1.5.4: cache of updated row bytes */ 259 260 png_uint_32 idat_size; /* current IDAT size for read */ 261 png_uint_32 crc; /* current chunk CRC value */ 262 png_colorp palette; /* palette from the input file */ 263 png_uint_16 num_palette; /* number of color entries in palette */ 264 265 /* Added at libpng-1.5.10 */ 266 #ifdef PNG_CHECK_FOR_INVALID_INDEX_SUPPORTED 267 int num_palette_max; /* maximum palette index found in IDAT */ 268 #endif 269 270 png_uint_16 num_trans; /* number of transparency values */ 271 png_byte compression; /* file compression type (always 0) */ 272 png_byte filter; /* file filter type (always 0) */ 273 png_byte interlaced; /* PNG_INTERLACE_NONE, PNG_INTERLACE_ADAM7 */ 274 png_byte pass; /* current interlace pass (0 - 6) */ 275 png_byte do_filter; /* row filter flags (see PNG_FILTER_ in png.h ) */ 276 png_byte color_type; /* color type of file */ 277 png_byte bit_depth; /* bit depth of file */ 278 png_byte usr_bit_depth; /* bit depth of users row: write only */ 279 png_byte pixel_depth; /* number of bits per pixel */ 280 png_byte channels; /* number of channels in file */ 281 #ifdef PNG_WRITE_SUPPORTED 282 png_byte usr_channels; /* channels at start of write: write only */ 283 #endif 284 png_byte sig_bytes; /* magic bytes read/written from start of file */ 285 png_byte maximum_pixel_depth; 286 /* pixel depth used for the row buffers */ 287 png_byte transformed_pixel_depth; 288 /* pixel depth after read/write transforms */ 289 #if ZLIB_VERNUM >= 0x1240 290 png_byte zstream_start; /* at start of an input zlib stream */ 291 #endif /* Zlib >= 1.2.4 */ 292 #if defined(PNG_READ_FILLER_SUPPORTED) || defined(PNG_WRITE_FILLER_SUPPORTED) 293 png_uint_16 filler; /* filler bytes for pixel expansion */ 294 #endif 295 296 #if defined(PNG_bKGD_SUPPORTED) || defined(PNG_READ_BACKGROUND_SUPPORTED) ||\ 297 defined(PNG_READ_ALPHA_MODE_SUPPORTED) 298 png_byte background_gamma_type; 299 png_fixed_point background_gamma; 300 png_color_16 background; /* background color in screen gamma space */ 301 #ifdef PNG_READ_GAMMA_SUPPORTED 302 png_color_16 background_1; /* background normalized to gamma 1.0 */ 303 #endif 304 #endif /* bKGD */ 305 306 #ifdef PNG_WRITE_FLUSH_SUPPORTED 307 png_flush_ptr output_flush_fn; /* Function for flushing output */ 308 png_uint_32 flush_dist; /* how many rows apart to flush, 0 - no flush */ 309 png_uint_32 flush_rows; /* number of rows written since last flush */ 310 #endif 311 312 #ifdef PNG_READ_GAMMA_SUPPORTED 313 int gamma_shift; /* number of "insignificant" bits in 16-bit gamma */ 314 png_fixed_point screen_gamma; /* screen gamma value (display_exponent) */ 315 316 png_bytep gamma_table; /* gamma table for 8-bit depth files */ 317 png_uint_16pp gamma_16_table; /* gamma table for 16-bit depth files */ 318 #if defined(PNG_READ_BACKGROUND_SUPPORTED) || \ 319 defined(PNG_READ_ALPHA_MODE_SUPPORTED) || \ 320 defined(PNG_READ_RGB_TO_GRAY_SUPPORTED) 321 png_bytep gamma_from_1; /* converts from 1.0 to screen */ 322 png_bytep gamma_to_1; /* converts from file to 1.0 */ 323 png_uint_16pp gamma_16_from_1; /* converts from 1.0 to screen */ 324 png_uint_16pp gamma_16_to_1; /* converts from file to 1.0 */ 325 #endif /* READ_BACKGROUND || READ_ALPHA_MODE || RGB_TO_GRAY */ 326 #endif 327 328 #if defined(PNG_READ_GAMMA_SUPPORTED) || defined(PNG_sBIT_SUPPORTED) 329 png_color_8 sig_bit; /* significant bits in each available channel */ 330 #endif 331 332 #if defined(PNG_READ_SHIFT_SUPPORTED) || defined(PNG_WRITE_SHIFT_SUPPORTED) 333 png_color_8 shift; /* shift for significant bit transformation */ 334 #endif 335 336 #if defined(PNG_tRNS_SUPPORTED) || defined(PNG_READ_BACKGROUND_SUPPORTED) \ 337 || defined(PNG_READ_EXPAND_SUPPORTED) || defined(PNG_READ_BACKGROUND_SUPPORTED) 338 png_bytep trans_alpha; /* alpha values for paletted files */ 339 png_color_16 trans_color; /* transparent color for non-paletted files */ 340 #endif 341 342 png_read_status_ptr read_row_fn; /* called after each row is decoded */ 343 png_write_status_ptr write_row_fn; /* called after each row is encoded */ 344 #ifdef PNG_PROGRESSIVE_READ_SUPPORTED 345 png_progressive_info_ptr info_fn; /* called after header data fully read */ 346 png_progressive_row_ptr row_fn; /* called after a prog. row is decoded */ 347 png_progressive_end_ptr end_fn; /* called after image is complete */ 348 png_bytep save_buffer_ptr; /* current location in save_buffer */ 349 png_bytep save_buffer; /* buffer for previously read data */ 350 png_bytep current_buffer_ptr; /* current location in current_buffer */ 351 png_bytep current_buffer; /* buffer for recently used data */ 352 png_uint_32 push_length; /* size of current input chunk */ 353 png_uint_32 skip_length; /* bytes to skip in input data */ 354 size_t save_buffer_size; /* amount of data now in save_buffer */ 355 size_t save_buffer_max; /* total size of save_buffer */ 356 size_t buffer_size; /* total amount of available input data */ 357 size_t current_buffer_size; /* amount of data now in current_buffer */ 358 int process_mode; /* what push library is currently doing */ 359 int cur_palette; /* current push library palette index */ 360 361 #endif /* PROGRESSIVE_READ */ 362 363 #if defined(__TURBOC__) && !defined(_Windows) && !defined(__FLAT__) 364 /* For the Borland special 64K segment handler */ 365 png_bytepp offset_table_ptr; 366 png_bytep offset_table; 367 png_uint_16 offset_table_number; 368 png_uint_16 offset_table_count; 369 png_uint_16 offset_table_count_free; 370 #endif 371 372 #ifdef PNG_READ_QUANTIZE_SUPPORTED 373 png_bytep palette_lookup; /* lookup table for quantizing */ 374 png_bytep quantize_index; /* index translation for palette files */ 375 #endif 376 377 /* Options */ 378 #ifdef PNG_SET_OPTION_SUPPORTED 379 png_uint_32 options; /* On/off state (up to 16 options) */ 380 #endif 381 382 #if PNG_LIBPNG_VER < 10700 383 /* To do: remove this from libpng-1.7 */ 384 #ifdef PNG_TIME_RFC1123_SUPPORTED 385 char time_buffer[29]; /* String to hold RFC 1123 time text */ 386 #endif 387 #endif 388 389 /* New members added in libpng-1.0.6 */ 390 391 png_uint_32 free_me; /* flags items libpng is responsible for freeing */ 392 393 #ifdef PNG_USER_CHUNKS_SUPPORTED 394 png_voidp user_chunk_ptr; 395 #ifdef PNG_READ_USER_CHUNKS_SUPPORTED 396 png_user_chunk_ptr read_user_chunk_fn; /* user read chunk handler */ 397 #endif 398 #endif 399 400 #ifdef PNG_SET_UNKNOWN_CHUNKS_SUPPORTED 401 int unknown_default; /* As PNG_HANDLE_* */ 402 unsigned int num_chunk_list; /* Number of entries in the list */ 403 png_bytep chunk_list; /* List of png_byte[5]; the textual chunk name 404 * followed by a PNG_HANDLE_* byte */ 405 #endif 406 407 /* New members added in libpng-1.0.3 */ 408 #ifdef PNG_READ_RGB_TO_GRAY_SUPPORTED 409 png_byte rgb_to_gray_status; 410 /* Added in libpng 1.5.5 to record setting of coefficients: */ 411 png_byte rgb_to_gray_coefficients_set; 412 /* These were changed from png_byte in libpng-1.0.6 */ 413 png_uint_16 rgb_to_gray_red_coeff; 414 png_uint_16 rgb_to_gray_green_coeff; 415 /* deleted in 1.5.5: rgb_to_gray_blue_coeff; */ 416 #endif 417 418 /* New member added in libpng-1.6.36 */ 419 #if defined(PNG_READ_EXPAND_SUPPORTED) && \ 420 defined(PNG_ARM_NEON_IMPLEMENTATION) 421 png_bytep riffled_palette; /* buffer for accelerated palette expansion */ 422 #endif 423 424 /* New member added in libpng-1.0.4 (renamed in 1.0.9) */ 425 #if defined(PNG_MNG_FEATURES_SUPPORTED) 426 /* Changed from png_byte to png_uint_32 at version 1.2.0 */ 427 png_uint_32 mng_features_permitted; 428 #endif 429 430 /* New member added in libpng-1.0.9, ifdef'ed out in 1.0.12, enabled in 1.2.0 */ 431 #ifdef PNG_MNG_FEATURES_SUPPORTED 432 png_byte filter_type; 433 #endif 434 435 /* New members added in libpng-1.2.0 */ 436 437 /* New members added in libpng-1.0.2 but first enabled by default in 1.2.0 */ 438 #ifdef PNG_USER_MEM_SUPPORTED 439 png_voidp mem_ptr; /* user supplied struct for mem functions */ 440 png_malloc_ptr malloc_fn; /* function for allocating memory */ 441 png_free_ptr free_fn; /* function for freeing memory */ 442 #endif 443 444 /* New member added in libpng-1.0.13 and 1.2.0 */ 445 png_bytep big_row_buf; /* buffer to save current (unfiltered) row */ 446 447 #ifdef PNG_READ_QUANTIZE_SUPPORTED 448 /* The following three members were added at version 1.0.14 and 1.2.4 */ 449 png_bytep quantize_sort; /* working sort array */ 450 png_bytep index_to_palette; /* where the original index currently is 451 in the palette */ 452 png_bytep palette_to_index; /* which original index points to this 453 palette color */ 454 #endif 455 456 /* New members added in libpng-1.0.16 and 1.2.6 */ 457 png_byte compression_type; 458 459 #ifdef PNG_USER_LIMITS_SUPPORTED 460 png_uint_32 user_width_max; 461 png_uint_32 user_height_max; 462 463 /* Added in libpng-1.4.0: Total number of sPLT, text, and unknown 464 * chunks that can be stored (0 means unlimited). 465 */ 466 png_uint_32 user_chunk_cache_max; 467 468 /* Total memory that a zTXt, sPLT, iTXt, iCCP, or unknown chunk 469 * can occupy when decompressed. 0 means unlimited. 470 */ 471 png_alloc_size_t user_chunk_malloc_max; 472 #endif 473 474 /* New member added in libpng-1.0.25 and 1.2.17 */ 475 #ifdef PNG_READ_UNKNOWN_CHUNKS_SUPPORTED 476 /* Temporary storage for unknown chunk that the library doesn't recognize, 477 * used while reading the chunk. 478 */ 479 png_unknown_chunk unknown_chunk; 480 #endif 481 482 /* New member added in libpng-1.2.26 */ 483 size_t old_big_row_buf_size; 484 485 #ifdef PNG_READ_SUPPORTED 486 /* New member added in libpng-1.2.30 */ 487 png_bytep read_buffer; /* buffer for reading chunk data */ 488 png_alloc_size_t read_buffer_size; /* current size of the buffer */ 489 #endif 490 #ifdef PNG_SEQUENTIAL_READ_SUPPORTED 491 uInt IDAT_read_size; /* limit on read buffer size for IDAT */ 492 #endif 493 494 #ifdef PNG_IO_STATE_SUPPORTED 495 /* New member added in libpng-1.4.0 */ 496 png_uint_32 io_state; 497 #endif 498 499 /* New member added in libpng-1.5.6 */ 500 png_bytep big_prev_row; 501 502 /* New member added in libpng-1.5.7 */ 503 void (*read_filter[PNG_FILTER_VALUE_LAST-1])(png_row_infop row_info, 504 png_bytep row, png_const_bytep prev_row); 505 506 #ifdef PNG_READ_SUPPORTED 507 #if defined(PNG_COLORSPACE_SUPPORTED) || defined(PNG_GAMMA_SUPPORTED) 508 png_colorspace colorspace; 509 #endif 510 #endif 511 }; 512 #endif /* PNGSTRUCT_H */