Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 1 | |
| 2 | /* pngstruct.h - header file for PNG reference library |
| 3 | * |
| 4 | * Copyright (c) 1998-2013 Glenn Randers-Pehrson |
| 5 | * (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger) |
| 6 | * (Version 0.88 Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.) |
| 7 | * |
| 8 | * Last changed in libpng 1.6.1 [March 28, 2013] |
| 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 structure that holds the information to read and write PNG files. |
| 16 | * The only people who need to care about what is inside of this are the |
| 17 | * people who will be modifying the library for their own special needs. |
| 18 | * It should NOT be accessed directly by an application. |
| 19 | */ |
| 20 | |
| 21 | #ifndef PNGSTRUCT_H |
| 22 | #define PNGSTRUCT_H |
| 23 | /* zlib.h defines the structure z_stream, an instance of which is included |
| 24 | * in this structure and is required for decompressing the LZ compressed |
| 25 | * data in PNG files. |
| 26 | */ |
| 27 | #ifndef ZLIB_CONST |
| 28 | /* We must ensure that zlib uses 'const' in declarations. */ |
| 29 | # define ZLIB_CONST |
| 30 | #endif |
| 31 | #include "zlib.h" |
| 32 | #ifdef const |
| 33 | /* zlib.h sometimes #defines const to nothing, undo this. */ |
| 34 | # undef const |
| 35 | #endif |
| 36 | |
| 37 | /* zlib.h has mediocre z_const use before 1.2.6, this stuff is for compatibility |
| 38 | * with older builds. |
| 39 | */ |
| 40 | #if ZLIB_VERNUM < 0x1260 |
| 41 | # define PNGZ_MSG_CAST(s) png_constcast(char*,s) |
| 42 | # define PNGZ_INPUT_CAST(b) png_constcast(png_bytep,b) |
| 43 | #else |
| 44 | # define PNGZ_MSG_CAST(s) (s) |
| 45 | # define PNGZ_INPUT_CAST(b) (b) |
| 46 | #endif |
| 47 | |
| 48 | /* zlib.h declares a magic type 'uInt' that limits the amount of data that zlib |
| 49 | * can handle at once. This type need be no larger than 16 bits (so maximum of |
| 50 | * 65535), this define allows us to discover how big it is, but limited by the |
| 51 | * maximuum for png_size_t. The value can be overriden in a library build |
| 52 | * (pngusr.h, or set it in CPPFLAGS) and it works to set it to a considerably |
| 53 | * lower value (e.g. 255 works). A lower value may help memory usage (slightly) |
| 54 | * and may even improve performance on some systems (and degrade it on others.) |
| 55 | */ |
| 56 | #ifndef ZLIB_IO_MAX |
| 57 | # define ZLIB_IO_MAX ((uInt)-1) |
| 58 | #endif |
| 59 | |
| 60 | #ifdef PNG_WRITE_SUPPORTED |
| 61 | /* The type of a compression buffer list used by the write code. */ |
| 62 | typedef struct png_compression_buffer |
| 63 | { |
| 64 | struct png_compression_buffer *next; |
| 65 | png_byte output[1]; /* actually zbuf_size */ |
| 66 | } png_compression_buffer, *png_compression_bufferp; |
| 67 | |
| 68 | #define PNG_COMPRESSION_BUFFER_SIZE(pp)\ |
| 69 | (offsetof(png_compression_buffer, output) + (pp)->zbuffer_size) |
| 70 | #endif |
| 71 | |
| 72 | /* Colorspace support; structures used in png_struct, png_info and in internal |
| 73 | * functions to hold and communicate information about the color space. |
| 74 | * |
| 75 | * PNG_COLORSPACE_SUPPORTED is only required if the application will perform |
| 76 | * colorspace corrections, otherwise all the colorspace information can be |
| 77 | * skipped and the size of libpng can be reduced (significantly) by compiling |
| 78 | * out the colorspace support. |
| 79 | */ |
| 80 | #ifdef PNG_COLORSPACE_SUPPORTED |
| 81 | /* The chromaticities of the red, green and blue colorants and the chromaticity |
| 82 | * of the corresponding white point (i.e. of rgb(1.0,1.0,1.0)). |
| 83 | */ |
| 84 | typedef struct png_xy |
| 85 | { |
| 86 | png_fixed_point redx, redy; |
| 87 | png_fixed_point greenx, greeny; |
| 88 | png_fixed_point bluex, bluey; |
| 89 | png_fixed_point whitex, whitey; |
| 90 | } png_xy; |
| 91 | |
| 92 | /* The same data as above but encoded as CIE XYZ values. When this data comes |
| 93 | * from chromaticities the sum of the Y values is assumed to be 1.0 |
| 94 | */ |
| 95 | typedef struct png_XYZ |
| 96 | { |
| 97 | png_fixed_point red_X, red_Y, red_Z; |
| 98 | png_fixed_point green_X, green_Y, green_Z; |
| 99 | png_fixed_point blue_X, blue_Y, blue_Z; |
| 100 | } png_XYZ; |
| 101 | #endif /* COLORSPACE */ |
| 102 | |
| 103 | #if defined(PNG_COLORSPACE_SUPPORTED) || defined(PNG_GAMMA_SUPPORTED) |
| 104 | /* A colorspace is all the above plus, potentially, profile information, |
| 105 | * however at present libpng does not use the profile internally so it is only |
| 106 | * stored in the png_info struct (if iCCP is supported.) The rendering intent |
| 107 | * is retained here and is checked. |
| 108 | * |
| 109 | * The file gamma encoding information is also stored here and gamma correction |
| 110 | * is done by libpng, whereas color correction must currently be done by the |
| 111 | * application. |
| 112 | */ |
| 113 | typedef struct png_colorspace |
| 114 | { |
| 115 | #ifdef PNG_GAMMA_SUPPORTED |
| 116 | png_fixed_point gamma; /* File gamma */ |
| 117 | #endif |
| 118 | |
| 119 | #ifdef PNG_COLORSPACE_SUPPORTED |
| 120 | png_xy end_points_xy; /* End points as chromaticities */ |
| 121 | png_XYZ end_points_XYZ; /* End points as CIE XYZ colorant values */ |
| 122 | png_uint_16 rendering_intent; /* Rendering intent of a profile */ |
| 123 | #endif |
| 124 | |
| 125 | /* Flags are always defined to simplify the code. */ |
| 126 | png_uint_16 flags; /* As defined below */ |
| 127 | } png_colorspace, * PNG_RESTRICT png_colorspacerp; |
| 128 | |
| 129 | typedef const png_colorspace * PNG_RESTRICT png_const_colorspacerp; |
| 130 | |
| 131 | /* General flags for the 'flags' field */ |
| 132 | #define PNG_COLORSPACE_HAVE_GAMMA 0x0001 |
| 133 | #define PNG_COLORSPACE_HAVE_ENDPOINTS 0x0002 |
| 134 | #define PNG_COLORSPACE_HAVE_INTENT 0x0004 |
| 135 | #define PNG_COLORSPACE_FROM_gAMA 0x0008 |
| 136 | #define PNG_COLORSPACE_FROM_cHRM 0x0010 |
| 137 | #define PNG_COLORSPACE_FROM_sRGB 0x0020 |
| 138 | #define PNG_COLORSPACE_ENDPOINTS_MATCH_sRGB 0x0040 |
| 139 | #define PNG_COLORSPACE_MATCHES_sRGB 0x0080 /* exact match on profile */ |
| 140 | #define PNG_COLORSPACE_INVALID 0x8000 |
| 141 | #define PNG_COLORSPACE_CANCEL(flags) (0xffff ^ (flags)) |
| 142 | #endif /* COLORSPACE || GAMMA */ |
| 143 | |
John Reck | 90bf0d2 | 2013-08-14 10:37:42 -0700 | [diff] [blame] | 144 | #ifdef PNG_INDEX_SUPPORTED |
| 145 | /* png_line_index_struct records an index point, where we impose an index point |
| 146 | * to be located at the beginning of a line for simplifying the implementation. |
| 147 | */ |
| 148 | typedef struct png_line_index_struct |
| 149 | { |
| 150 | // state of the lz decoder |
| 151 | z_streamp z_state; |
| 152 | |
| 153 | // the IDAT header position of the chunk, which the index point is in |
| 154 | png_uint_32 stream_idat_position; |
| 155 | |
| 156 | // we intend to record the offset of the index point in the chunk, |
| 157 | // but we record the number of remaining bytes in the chunk after the |
| 158 | // index point. That's because PNG processes a chunk this way. |
| 159 | png_uint_32 bytes_left_in_idat; |
| 160 | |
| 161 | // decompressed data of the previous row |
| 162 | png_bytep prev_row; |
| 163 | } png_line_index; |
| 164 | typedef png_line_index FAR * png_line_indexp; |
| 165 | |
| 166 | typedef struct png_index_struct |
| 167 | { |
| 168 | // A temporary variable used when we build the index. The variable records |
| 169 | // the IDAT header position of the last chunk read in so far. |
| 170 | png_uint_32 stream_idat_position; |
| 171 | |
| 172 | // line index information about each passes |
| 173 | |
| 174 | // the number of index points in each pass |
| 175 | png_uint_32 size[7]; |
| 176 | |
| 177 | // the line span of two index points of each pass |
| 178 | png_uint_32 step[7]; |
| 179 | |
| 180 | // the index points of each pass |
| 181 | png_line_indexp *pass_line_index[7]; |
| 182 | } png_index; |
| 183 | typedef png_index FAR * png_indexp; |
| 184 | |
| 185 | #define INDEX_SAMPLE_SIZE 254 |
| 186 | #endif |
| 187 | |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 188 | struct png_struct_def |
| 189 | { |
| 190 | #ifdef PNG_SETJMP_SUPPORTED |
| 191 | jmp_buf jmp_buf_local; /* New name in 1.6.0 for jmp_buf in png_struct */ |
| 192 | png_longjmp_ptr longjmp_fn;/* setjmp non-local goto function. */ |
| 193 | jmp_buf *jmp_buf_ptr; /* passed to longjmp_fn */ |
| 194 | size_t jmp_buf_size; /* size of the above, if allocated */ |
| 195 | #endif |
| 196 | png_error_ptr error_fn; /* function for printing errors and aborting */ |
| 197 | #ifdef PNG_WARNINGS_SUPPORTED |
| 198 | png_error_ptr warning_fn; /* function for printing warnings */ |
| 199 | #endif |
| 200 | png_voidp error_ptr; /* user supplied struct for error functions */ |
| 201 | png_rw_ptr write_data_fn; /* function for writing output data */ |
| 202 | png_rw_ptr read_data_fn; /* function for reading input data */ |
John Reck | 90bf0d2 | 2013-08-14 10:37:42 -0700 | [diff] [blame] | 203 | #ifdef PNG_INDEX_SUPPORTED |
| 204 | png_seek_ptr seek_data_fn; /* function for seeking input data */ |
| 205 | #endif |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 206 | png_voidp io_ptr; /* ptr to application struct for I/O functions */ |
| 207 | |
| 208 | #ifdef PNG_READ_USER_TRANSFORM_SUPPORTED |
| 209 | png_user_transform_ptr read_user_transform_fn; /* user read transform */ |
| 210 | #endif |
| 211 | |
| 212 | #ifdef PNG_WRITE_USER_TRANSFORM_SUPPORTED |
| 213 | png_user_transform_ptr write_user_transform_fn; /* user write transform */ |
| 214 | #endif |
| 215 | |
| 216 | /* These were added in libpng-1.0.2 */ |
| 217 | #ifdef PNG_USER_TRANSFORM_PTR_SUPPORTED |
| 218 | #if defined(PNG_READ_USER_TRANSFORM_SUPPORTED) || \ |
| 219 | defined(PNG_WRITE_USER_TRANSFORM_SUPPORTED) |
| 220 | png_voidp user_transform_ptr; /* user supplied struct for user transform */ |
| 221 | png_byte user_transform_depth; /* bit depth of user transformed pixels */ |
| 222 | png_byte user_transform_channels; /* channels in user transformed pixels */ |
| 223 | #endif |
| 224 | #endif |
| 225 | |
| 226 | png_uint_32 mode; /* tells us where we are in the PNG file */ |
| 227 | png_uint_32 flags; /* flags indicating various things to libpng */ |
| 228 | png_uint_32 transformations; /* which transformations to perform */ |
| 229 | |
| 230 | png_uint_32 zowner; /* ID (chunk type) of zstream owner, 0 if none */ |
| 231 | z_stream zstream; /* decompression structure */ |
| 232 | |
| 233 | #ifdef PNG_WRITE_SUPPORTED |
| 234 | png_compression_bufferp zbuffer_list; /* Created on demand during write */ |
| 235 | uInt zbuffer_size; /* size of the actual buffer */ |
| 236 | |
| 237 | int zlib_level; /* holds zlib compression level */ |
| 238 | int zlib_method; /* holds zlib compression method */ |
| 239 | int zlib_window_bits; /* holds zlib compression window bits */ |
| 240 | int zlib_mem_level; /* holds zlib compression memory level */ |
| 241 | int zlib_strategy; /* holds zlib compression strategy */ |
| 242 | #endif |
| 243 | /* Added at libpng 1.5.4 */ |
| 244 | #ifdef PNG_WRITE_CUSTOMIZE_ZTXT_COMPRESSION_SUPPORTED |
| 245 | int zlib_text_level; /* holds zlib compression level */ |
| 246 | int zlib_text_method; /* holds zlib compression method */ |
| 247 | int zlib_text_window_bits; /* holds zlib compression window bits */ |
| 248 | int zlib_text_mem_level; /* holds zlib compression memory level */ |
| 249 | int zlib_text_strategy; /* holds zlib compression strategy */ |
| 250 | #endif |
| 251 | /* End of material added at libpng 1.5.4 */ |
| 252 | /* Added at libpng 1.6.0 */ |
| 253 | #ifdef PNG_WRITE_SUPPORTED |
| 254 | int zlib_set_level; /* Actual values set into the zstream on write */ |
| 255 | int zlib_set_method; |
| 256 | int zlib_set_window_bits; |
| 257 | int zlib_set_mem_level; |
| 258 | int zlib_set_strategy; |
| 259 | #endif |
| 260 | |
| 261 | png_uint_32 width; /* width of image in pixels */ |
| 262 | png_uint_32 height; /* height of image in pixels */ |
| 263 | png_uint_32 num_rows; /* number of rows in current pass */ |
| 264 | png_uint_32 usr_width; /* width of row at start of write */ |
| 265 | png_size_t rowbytes; /* size of row in bytes */ |
| 266 | png_uint_32 iwidth; /* width of current interlaced row in pixels */ |
| 267 | png_uint_32 row_number; /* current row in interlace pass */ |
| 268 | png_uint_32 chunk_name; /* PNG_CHUNK() id of current chunk */ |
| 269 | png_bytep prev_row; /* buffer to save previous (unfiltered) row. |
| 270 | * This is a pointer into big_prev_row |
| 271 | */ |
| 272 | png_bytep row_buf; /* buffer to save current (unfiltered) row. |
| 273 | * This is a pointer into big_row_buf |
| 274 | */ |
| 275 | #ifdef PNG_WRITE_SUPPORTED |
| 276 | png_bytep sub_row; /* buffer to save "sub" row when filtering */ |
| 277 | png_bytep up_row; /* buffer to save "up" row when filtering */ |
| 278 | png_bytep avg_row; /* buffer to save "avg" row when filtering */ |
| 279 | png_bytep paeth_row; /* buffer to save "Paeth" row when filtering */ |
| 280 | #endif |
| 281 | png_size_t info_rowbytes; /* Added in 1.5.4: cache of updated row bytes */ |
| 282 | |
| 283 | png_uint_32 idat_size; /* current IDAT size for read */ |
| 284 | png_uint_32 crc; /* current chunk CRC value */ |
| 285 | png_colorp palette; /* palette from the input file */ |
| 286 | png_uint_16 num_palette; /* number of color entries in palette */ |
| 287 | |
| 288 | /* Added at libpng-1.5.10 */ |
| 289 | #ifdef PNG_CHECK_FOR_INVALID_INDEX_SUPPORTED |
| 290 | int num_palette_max; /* maximum palette index found in IDAT */ |
| 291 | #endif |
| 292 | |
| 293 | png_uint_16 num_trans; /* number of transparency values */ |
| 294 | png_byte compression; /* file compression type (always 0) */ |
| 295 | png_byte filter; /* file filter type (always 0) */ |
| 296 | png_byte interlaced; /* PNG_INTERLACE_NONE, PNG_INTERLACE_ADAM7 */ |
| 297 | png_byte pass; /* current interlace pass (0 - 6) */ |
| 298 | png_byte do_filter; /* row filter flags (see PNG_FILTER_ below ) */ |
| 299 | png_byte color_type; /* color type of file */ |
| 300 | png_byte bit_depth; /* bit depth of file */ |
| 301 | png_byte usr_bit_depth; /* bit depth of users row: write only */ |
| 302 | png_byte pixel_depth; /* number of bits per pixel */ |
| 303 | png_byte channels; /* number of channels in file */ |
| 304 | #ifdef PNG_WRITE_SUPPORTED |
| 305 | png_byte usr_channels; /* channels at start of write: write only */ |
| 306 | #endif |
| 307 | png_byte sig_bytes; /* magic bytes read/written from start of file */ |
| 308 | png_byte maximum_pixel_depth; |
| 309 | /* pixel depth used for the row buffers */ |
| 310 | png_byte transformed_pixel_depth; |
| 311 | /* pixel depth after read/write transforms */ |
| 312 | #if defined(PNG_READ_FILLER_SUPPORTED) || defined(PNG_WRITE_FILLER_SUPPORTED) |
| 313 | png_uint_16 filler; /* filler bytes for pixel expansion */ |
| 314 | #endif |
| 315 | |
| 316 | #if defined(PNG_bKGD_SUPPORTED) || defined(PNG_READ_BACKGROUND_SUPPORTED) ||\ |
| 317 | defined(PNG_READ_ALPHA_MODE_SUPPORTED) |
| 318 | png_byte background_gamma_type; |
| 319 | png_fixed_point background_gamma; |
| 320 | png_color_16 background; /* background color in screen gamma space */ |
| 321 | #ifdef PNG_READ_GAMMA_SUPPORTED |
| 322 | png_color_16 background_1; /* background normalized to gamma 1.0 */ |
| 323 | #endif |
| 324 | #endif /* PNG_bKGD_SUPPORTED */ |
| 325 | |
| 326 | #ifdef PNG_WRITE_FLUSH_SUPPORTED |
| 327 | png_flush_ptr output_flush_fn; /* Function for flushing output */ |
| 328 | png_uint_32 flush_dist; /* how many rows apart to flush, 0 - no flush */ |
| 329 | png_uint_32 flush_rows; /* number of rows written since last flush */ |
| 330 | #endif |
| 331 | |
| 332 | #ifdef PNG_READ_GAMMA_SUPPORTED |
| 333 | int gamma_shift; /* number of "insignificant" bits in 16-bit gamma */ |
| 334 | png_fixed_point screen_gamma; /* screen gamma value (display_exponent) */ |
| 335 | |
| 336 | png_bytep gamma_table; /* gamma table for 8-bit depth files */ |
| 337 | png_uint_16pp gamma_16_table; /* gamma table for 16-bit depth files */ |
| 338 | #if defined(PNG_READ_BACKGROUND_SUPPORTED) || \ |
| 339 | defined(PNG_READ_ALPHA_MODE_SUPPORTED) || \ |
| 340 | defined(PNG_READ_RGB_TO_GRAY_SUPPORTED) |
| 341 | png_bytep gamma_from_1; /* converts from 1.0 to screen */ |
| 342 | png_bytep gamma_to_1; /* converts from file to 1.0 */ |
| 343 | png_uint_16pp gamma_16_from_1; /* converts from 1.0 to screen */ |
| 344 | png_uint_16pp gamma_16_to_1; /* converts from file to 1.0 */ |
| 345 | #endif /* READ_BACKGROUND || READ_ALPHA_MODE || RGB_TO_GRAY */ |
| 346 | #endif |
| 347 | |
| 348 | #if defined(PNG_READ_GAMMA_SUPPORTED) || defined(PNG_sBIT_SUPPORTED) |
| 349 | png_color_8 sig_bit; /* significant bits in each available channel */ |
| 350 | #endif |
| 351 | |
| 352 | #if defined(PNG_READ_SHIFT_SUPPORTED) || defined(PNG_WRITE_SHIFT_SUPPORTED) |
| 353 | png_color_8 shift; /* shift for significant bit tranformation */ |
| 354 | #endif |
| 355 | |
| 356 | #if defined(PNG_tRNS_SUPPORTED) || defined(PNG_READ_BACKGROUND_SUPPORTED) \ |
| 357 | || defined(PNG_READ_EXPAND_SUPPORTED) || defined(PNG_READ_BACKGROUND_SUPPORTED) |
| 358 | png_bytep trans_alpha; /* alpha values for paletted files */ |
| 359 | png_color_16 trans_color; /* transparent color for non-paletted files */ |
| 360 | #endif |
| 361 | |
| 362 | png_read_status_ptr read_row_fn; /* called after each row is decoded */ |
| 363 | png_write_status_ptr write_row_fn; /* called after each row is encoded */ |
| 364 | #ifdef PNG_PROGRESSIVE_READ_SUPPORTED |
| 365 | png_progressive_info_ptr info_fn; /* called after header data fully read */ |
| 366 | png_progressive_row_ptr row_fn; /* called after a prog. row is decoded */ |
| 367 | png_progressive_end_ptr end_fn; /* called after image is complete */ |
| 368 | png_bytep save_buffer_ptr; /* current location in save_buffer */ |
| 369 | png_bytep save_buffer; /* buffer for previously read data */ |
| 370 | png_bytep current_buffer_ptr; /* current location in current_buffer */ |
| 371 | png_bytep current_buffer; /* buffer for recently used data */ |
| 372 | png_uint_32 push_length; /* size of current input chunk */ |
| 373 | png_uint_32 skip_length; /* bytes to skip in input data */ |
| 374 | png_size_t save_buffer_size; /* amount of data now in save_buffer */ |
| 375 | png_size_t save_buffer_max; /* total size of save_buffer */ |
| 376 | png_size_t buffer_size; /* total amount of available input data */ |
| 377 | png_size_t current_buffer_size; /* amount of data now in current_buffer */ |
| 378 | int process_mode; /* what push library is currently doing */ |
| 379 | int cur_palette; /* current push library palette index */ |
| 380 | |
| 381 | #endif /* PNG_PROGRESSIVE_READ_SUPPORTED */ |
| 382 | |
| 383 | #if defined(__TURBOC__) && !defined(_Windows) && !defined(__FLAT__) |
| 384 | /* For the Borland special 64K segment handler */ |
| 385 | png_bytepp offset_table_ptr; |
| 386 | png_bytep offset_table; |
| 387 | png_uint_16 offset_table_number; |
| 388 | png_uint_16 offset_table_count; |
| 389 | png_uint_16 offset_table_count_free; |
| 390 | #endif |
| 391 | |
| 392 | #ifdef PNG_READ_QUANTIZE_SUPPORTED |
| 393 | png_bytep palette_lookup; /* lookup table for quantizing */ |
| 394 | png_bytep quantize_index; /* index translation for palette files */ |
| 395 | #endif |
| 396 | |
| 397 | #ifdef PNG_WRITE_WEIGHTED_FILTER_SUPPORTED |
| 398 | png_byte heuristic_method; /* heuristic for row filter selection */ |
| 399 | png_byte num_prev_filters; /* number of weights for previous rows */ |
| 400 | png_bytep prev_filters; /* filter type(s) of previous row(s) */ |
| 401 | png_uint_16p filter_weights; /* weight(s) for previous line(s) */ |
| 402 | png_uint_16p inv_filter_weights; /* 1/weight(s) for previous line(s) */ |
| 403 | png_uint_16p filter_costs; /* relative filter calculation cost */ |
| 404 | png_uint_16p inv_filter_costs; /* 1/relative filter calculation cost */ |
| 405 | #endif |
| 406 | |
| 407 | /* Options */ |
| 408 | #ifdef PNG_SET_OPTION_SUPPORTED |
| 409 | png_byte options; /* On/off state (up to 4 options) */ |
| 410 | #endif |
| 411 | |
| 412 | #if PNG_LIBPNG_VER < 10700 |
| 413 | /* To do: remove this from libpng-1.7 */ |
| 414 | #ifdef PNG_TIME_RFC1123_SUPPORTED |
| 415 | char time_buffer[29]; /* String to hold RFC 1123 time text */ |
| 416 | #endif |
| 417 | #endif |
| 418 | |
| 419 | /* New members added in libpng-1.0.6 */ |
| 420 | |
| 421 | png_uint_32 free_me; /* flags items libpng is responsible for freeing */ |
| 422 | |
| 423 | #ifdef PNG_USER_CHUNKS_SUPPORTED |
| 424 | png_voidp user_chunk_ptr; |
| 425 | #ifdef PNG_READ_USER_CHUNKS_SUPPORTED |
| 426 | png_user_chunk_ptr read_user_chunk_fn; /* user read chunk handler */ |
| 427 | #endif |
| 428 | #endif |
| 429 | |
| 430 | #ifdef PNG_SET_UNKNOWN_CHUNKS_SUPPORTED |
| 431 | int unknown_default; /* As PNG_HANDLE_* */ |
| 432 | unsigned int num_chunk_list; /* Number of entries in the list */ |
| 433 | png_bytep chunk_list; /* List of png_byte[5]; the textual chunk name |
| 434 | * followed by a PNG_HANDLE_* byte */ |
| 435 | #endif |
| 436 | |
| 437 | /* New members added in libpng-1.0.3 */ |
| 438 | #ifdef PNG_READ_RGB_TO_GRAY_SUPPORTED |
| 439 | png_byte rgb_to_gray_status; |
| 440 | /* Added in libpng 1.5.5 to record setting of coefficients: */ |
| 441 | png_byte rgb_to_gray_coefficients_set; |
| 442 | /* These were changed from png_byte in libpng-1.0.6 */ |
| 443 | png_uint_16 rgb_to_gray_red_coeff; |
| 444 | png_uint_16 rgb_to_gray_green_coeff; |
| 445 | /* deleted in 1.5.5: rgb_to_gray_blue_coeff; */ |
| 446 | #endif |
| 447 | |
| 448 | /* New member added in libpng-1.0.4 (renamed in 1.0.9) */ |
| 449 | #if defined(PNG_MNG_FEATURES_SUPPORTED) |
| 450 | /* Changed from png_byte to png_uint_32 at version 1.2.0 */ |
| 451 | png_uint_32 mng_features_permitted; |
| 452 | #endif |
| 453 | |
| 454 | /* New member added in libpng-1.0.9, ifdef'ed out in 1.0.12, enabled in 1.2.0 */ |
| 455 | #ifdef PNG_MNG_FEATURES_SUPPORTED |
| 456 | png_byte filter_type; |
| 457 | #endif |
| 458 | |
| 459 | /* New members added in libpng-1.2.0 */ |
| 460 | |
| 461 | /* New members added in libpng-1.0.2 but first enabled by default in 1.2.0 */ |
| 462 | #ifdef PNG_USER_MEM_SUPPORTED |
| 463 | png_voidp mem_ptr; /* user supplied struct for mem functions */ |
| 464 | png_malloc_ptr malloc_fn; /* function for allocating memory */ |
| 465 | png_free_ptr free_fn; /* function for freeing memory */ |
| 466 | #endif |
| 467 | |
| 468 | /* New member added in libpng-1.0.13 and 1.2.0 */ |
| 469 | png_bytep big_row_buf; /* buffer to save current (unfiltered) row */ |
| 470 | |
| 471 | #ifdef PNG_READ_QUANTIZE_SUPPORTED |
| 472 | /* The following three members were added at version 1.0.14 and 1.2.4 */ |
| 473 | png_bytep quantize_sort; /* working sort array */ |
| 474 | png_bytep index_to_palette; /* where the original index currently is |
| 475 | in the palette */ |
| 476 | png_bytep palette_to_index; /* which original index points to this |
| 477 | palette color */ |
| 478 | #endif |
| 479 | |
| 480 | /* New members added in libpng-1.0.16 and 1.2.6 */ |
| 481 | png_byte compression_type; |
| 482 | |
| 483 | #ifdef PNG_USER_LIMITS_SUPPORTED |
| 484 | png_uint_32 user_width_max; |
| 485 | png_uint_32 user_height_max; |
| 486 | |
| 487 | /* Added in libpng-1.4.0: Total number of sPLT, text, and unknown |
| 488 | * chunks that can be stored (0 means unlimited). |
| 489 | */ |
| 490 | png_uint_32 user_chunk_cache_max; |
| 491 | |
| 492 | /* Total memory that a zTXt, sPLT, iTXt, iCCP, or unknown chunk |
| 493 | * can occupy when decompressed. 0 means unlimited. |
| 494 | */ |
| 495 | png_alloc_size_t user_chunk_malloc_max; |
| 496 | #endif |
| 497 | |
| 498 | /* New member added in libpng-1.0.25 and 1.2.17 */ |
| 499 | #ifdef PNG_READ_UNKNOWN_CHUNKS_SUPPORTED |
| 500 | /* Temporary storage for unknown chunk that the library doesn't recognize, |
| 501 | * used while reading the chunk. |
| 502 | */ |
| 503 | png_unknown_chunk unknown_chunk; |
| 504 | #endif |
| 505 | |
| 506 | /* New member added in libpng-1.2.26 */ |
| 507 | png_size_t old_big_row_buf_size; |
| 508 | |
| 509 | #ifdef PNG_READ_SUPPORTED |
| 510 | /* New member added in libpng-1.2.30 */ |
| 511 | png_bytep read_buffer; /* buffer for reading chunk data */ |
| 512 | png_alloc_size_t read_buffer_size; /* current size of the buffer */ |
| 513 | #endif |
| 514 | #ifdef PNG_SEQUENTIAL_READ_SUPPORTED |
| 515 | uInt IDAT_read_size; /* limit on read buffer size for IDAT */ |
| 516 | #endif |
| 517 | |
| 518 | #ifdef PNG_IO_STATE_SUPPORTED |
| 519 | /* New member added in libpng-1.4.0 */ |
| 520 | png_uint_32 io_state; |
| 521 | #endif |
| 522 | |
| 523 | /* New member added in libpng-1.5.6 */ |
| 524 | png_bytep big_prev_row; |
| 525 | |
| 526 | /* New member added in libpng-1.5.7 */ |
| 527 | void (*read_filter[PNG_FILTER_VALUE_LAST-1])(png_row_infop row_info, |
| 528 | png_bytep row, png_const_bytep prev_row); |
| 529 | |
| 530 | #ifdef PNG_READ_SUPPORTED |
| 531 | #if defined(PNG_COLORSPACE_SUPPORTED) || defined(PNG_GAMMA_SUPPORTED) |
| 532 | png_colorspace colorspace; |
| 533 | #endif |
| 534 | #endif |
John Reck | 90bf0d2 | 2013-08-14 10:37:42 -0700 | [diff] [blame] | 535 | |
| 536 | #ifdef PNG_INDEX_SUPPORTED |
| 537 | png_indexp index; |
| 538 | png_uint_32 total_data_read; |
| 539 | #endif |
| 540 | |
Chris Craik | b50c217 | 2013-07-29 15:28:30 -0700 | [diff] [blame] | 541 | }; |
| 542 | #endif /* PNGSTRUCT_H */ |