The Tor Browser / annotate

media/libpng/pngstruct.h@6474c204b198 (annotated)

media/libpng/pngstruct.h

Wed, 31 Dec 2014 06:09:35 +0100

author
Michael Schloh von Bennewitz <michael@schloh.com>
date
Wed, 31 Dec 2014 06:09:35 +0100
changeset 0
6474c204b198
permissions
-rw-r--r--

Cloned upstream origin tor-browser at tor-browser-31.3.0esr-4.5-1-build1
revision ID fc1c9ff7c1b2defdbc039f12214767608f46423f for hacking purpose.

michael@0 1
michael@0 2 /* pngstruct.h - header file for PNG reference library
michael@0 3 *
michael@0 4 * Copyright (c) 1998-2013 Glenn Randers-Pehrson
michael@0 5 * (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger)
michael@0 6 * (Version 0.88 Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.)
michael@0 7 *
michael@0 8 * Last changed in libpng 1.6.1 [March 28, 2013]
michael@0 9 *
michael@0 10 * This code is released under the libpng license.
michael@0 11 * For conditions of distribution and use, see the disclaimer
michael@0 12 * and license in png.h
michael@0 13 */
michael@0 14
michael@0 15 /* The structure that holds the information to read and write PNG files.
michael@0 16 * The only people who need to care about what is inside of this are the
michael@0 17 * people who will be modifying the library for their own special needs.
michael@0 18 * It should NOT be accessed directly by an application.
michael@0 19 */
michael@0 20
michael@0 21 #ifndef PNGSTRUCT_H
michael@0 22 #define PNGSTRUCT_H
michael@0 23 /* zlib.h defines the structure z_stream, an instance of which is included
michael@0 24 * in this structure and is required for decompressing the LZ compressed
michael@0 25 * data in PNG files.
michael@0 26 */
michael@0 27 #ifndef ZLIB_CONST
michael@0 28 /* We must ensure that zlib uses 'const' in declarations. */
michael@0 29 # define ZLIB_CONST
michael@0 30 #endif
michael@0 31 #include "zlib.h"
michael@0 32 #ifdef const
michael@0 33 /* zlib.h sometimes #defines const to nothing, undo this. */
michael@0 34 # undef const
michael@0 35 #endif
michael@0 36
michael@0 37 /* zlib.h has mediocre z_const use before 1.2.6, this stuff is for compatibility
michael@0 38 * with older builds.
michael@0 39 */
michael@0 40 #if ZLIB_VERNUM < 0x1260
michael@0 41 # define PNGZ_MSG_CAST(s) png_constcast(char*,s)
michael@0 42 # define PNGZ_INPUT_CAST(b) png_constcast(png_bytep,b)
michael@0 43 #else
michael@0 44 # define PNGZ_MSG_CAST(s) (s)
michael@0 45 # define PNGZ_INPUT_CAST(b) (b)
michael@0 46 #endif
michael@0 47
michael@0 48 /* zlib.h declares a magic type 'uInt' that limits the amount of data that zlib
michael@0 49 * can handle at once. This type need be no larger than 16 bits (so maximum of
michael@0 50 * 65535), this define allows us to discover how big it is, but limited by the
michael@0 51 * maximuum for png_size_t. The value can be overriden in a library build
michael@0 52 * (pngusr.h, or set it in CPPFLAGS) and it works to set it to a considerably
michael@0 53 * lower value (e.g. 255 works). A lower value may help memory usage (slightly)
michael@0 54 * and may even improve performance on some systems (and degrade it on others.)
michael@0 55 */
michael@0 56 #ifndef ZLIB_IO_MAX
michael@0 57 # define ZLIB_IO_MAX ((uInt)-1)
michael@0 58 #endif
michael@0 59
michael@0 60 #ifdef PNG_WRITE_SUPPORTED
michael@0 61 /* The type of a compression buffer list used by the write code. */
michael@0 62 typedef struct png_compression_buffer
michael@0 63 {
michael@0 64 struct png_compression_buffer *next;
michael@0 65 png_byte output[1]; /* actually zbuf_size */
michael@0 66 } png_compression_buffer, *png_compression_bufferp;
michael@0 67
michael@0 68 #define PNG_COMPRESSION_BUFFER_SIZE(pp)\
michael@0 69 (offsetof(png_compression_buffer, output) + (pp)->zbuffer_size)
michael@0 70 #endif
michael@0 71
michael@0 72 /* Colorspace support; structures used in png_struct, png_info and in internal
michael@0 73 * functions to hold and communicate information about the color space.
michael@0 74 *
michael@0 75 * PNG_COLORSPACE_SUPPORTED is only required if the application will perform
michael@0 76 * colorspace corrections, otherwise all the colorspace information can be
michael@0 77 * skipped and the size of libpng can be reduced (significantly) by compiling
michael@0 78 * out the colorspace support.
michael@0 79 */
michael@0 80 #ifdef PNG_COLORSPACE_SUPPORTED
michael@0 81 /* The chromaticities of the red, green and blue colorants and the chromaticity
michael@0 82 * of the corresponding white point (i.e. of rgb(1.0,1.0,1.0)).
michael@0 83 */
michael@0 84 typedef struct png_xy
michael@0 85 {
michael@0 86 png_fixed_point redx, redy;
michael@0 87 png_fixed_point greenx, greeny;
michael@0 88 png_fixed_point bluex, bluey;
michael@0 89 png_fixed_point whitex, whitey;
michael@0 90 } png_xy;
michael@0 91
michael@0 92 /* The same data as above but encoded as CIE XYZ values. When this data comes
michael@0 93 * from chromaticities the sum of the Y values is assumed to be 1.0
michael@0 94 */
michael@0 95 typedef struct png_XYZ
michael@0 96 {
michael@0 97 png_fixed_point red_X, red_Y, red_Z;
michael@0 98 png_fixed_point green_X, green_Y, green_Z;
michael@0 99 png_fixed_point blue_X, blue_Y, blue_Z;
michael@0 100 } png_XYZ;
michael@0 101 #endif /* COLORSPACE */
michael@0 102
michael@0 103 #if defined(PNG_COLORSPACE_SUPPORTED) || defined(PNG_GAMMA_SUPPORTED)
michael@0 104 /* A colorspace is all the above plus, potentially, profile information,
michael@0 105 * however at present libpng does not use the profile internally so it is only
michael@0 106 * stored in the png_info struct (if iCCP is supported.) The rendering intent
michael@0 107 * is retained here and is checked.
michael@0 108 *
michael@0 109 * The file gamma encoding information is also stored here and gamma correction
michael@0 110 * is done by libpng, whereas color correction must currently be done by the
michael@0 111 * application.
michael@0 112 */
michael@0 113 typedef struct png_colorspace
michael@0 114 {
michael@0 115 #ifdef PNG_GAMMA_SUPPORTED
michael@0 116 png_fixed_point gamma; /* File gamma */
michael@0 117 #endif
michael@0 118
michael@0 119 #ifdef PNG_COLORSPACE_SUPPORTED
michael@0 120 png_xy end_points_xy; /* End points as chromaticities */
michael@0 121 png_XYZ end_points_XYZ; /* End points as CIE XYZ colorant values */
michael@0 122 png_uint_16 rendering_intent; /* Rendering intent of a profile */
michael@0 123 #endif
michael@0 124
michael@0 125 /* Flags are always defined to simplify the code. */
michael@0 126 png_uint_16 flags; /* As defined below */
michael@0 127 } png_colorspace, * PNG_RESTRICT png_colorspacerp;
michael@0 128
michael@0 129 typedef const png_colorspace * PNG_RESTRICT png_const_colorspacerp;
michael@0 130
michael@0 131 /* General flags for the 'flags' field */
michael@0 132 #define PNG_COLORSPACE_HAVE_GAMMA 0x0001
michael@0 133 #define PNG_COLORSPACE_HAVE_ENDPOINTS 0x0002
michael@0 134 #define PNG_COLORSPACE_HAVE_INTENT 0x0004
michael@0 135 #define PNG_COLORSPACE_FROM_gAMA 0x0008
michael@0 136 #define PNG_COLORSPACE_FROM_cHRM 0x0010
michael@0 137 #define PNG_COLORSPACE_FROM_sRGB 0x0020
michael@0 138 #define PNG_COLORSPACE_ENDPOINTS_MATCH_sRGB 0x0040
michael@0 139 #define PNG_COLORSPACE_MATCHES_sRGB 0x0080 /* exact match on profile */
michael@0 140 #define PNG_COLORSPACE_INVALID 0x8000
michael@0 141 #define PNG_COLORSPACE_CANCEL(flags) (0xffff ^ (flags))
michael@0 142 #endif /* COLORSPACE || GAMMA */
michael@0 143
michael@0 144 struct png_struct_def
michael@0 145 {
michael@0 146 #ifdef PNG_SETJMP_SUPPORTED
michael@0 147 jmp_buf jmp_buf_local; /* New name in 1.6.0 for jmp_buf in png_struct */
michael@0 148 png_longjmp_ptr longjmp_fn;/* setjmp non-local goto function. */
michael@0 149 jmp_buf *jmp_buf_ptr; /* passed to longjmp_fn */
michael@0 150 size_t jmp_buf_size; /* size of the above, if allocated */
michael@0 151 #endif
michael@0 152 png_error_ptr error_fn; /* function for printing errors and aborting */
michael@0 153 #ifdef PNG_WARNINGS_SUPPORTED
michael@0 154 png_error_ptr warning_fn; /* function for printing warnings */
michael@0 155 #endif
michael@0 156 png_voidp error_ptr; /* user supplied struct for error functions */
michael@0 157 png_rw_ptr write_data_fn; /* function for writing output data */
michael@0 158 png_rw_ptr read_data_fn; /* function for reading input data */
michael@0 159 png_voidp io_ptr; /* ptr to application struct for I/O functions */
michael@0 160
michael@0 161 #ifdef PNG_READ_USER_TRANSFORM_SUPPORTED
michael@0 162 png_user_transform_ptr read_user_transform_fn; /* user read transform */
michael@0 163 #endif
michael@0 164
michael@0 165 #ifdef PNG_WRITE_USER_TRANSFORM_SUPPORTED
michael@0 166 png_user_transform_ptr write_user_transform_fn; /* user write transform */
michael@0 167 #endif
michael@0 168
michael@0 169 /* These were added in libpng-1.0.2 */
michael@0 170 #ifdef PNG_USER_TRANSFORM_PTR_SUPPORTED
michael@0 171 #if defined(PNG_READ_USER_TRANSFORM_SUPPORTED) || \
michael@0 172 defined(PNG_WRITE_USER_TRANSFORM_SUPPORTED)
michael@0 173 png_voidp user_transform_ptr; /* user supplied struct for user transform */
michael@0 174 png_byte user_transform_depth; /* bit depth of user transformed pixels */
michael@0 175 png_byte user_transform_channels; /* channels in user transformed pixels */
michael@0 176 #endif
michael@0 177 #endif
michael@0 178
michael@0 179 png_uint_32 mode; /* tells us where we are in the PNG file */
michael@0 180 png_uint_32 flags; /* flags indicating various things to libpng */
michael@0 181 png_uint_32 transformations; /* which transformations to perform */
michael@0 182
michael@0 183 png_uint_32 zowner; /* ID (chunk type) of zstream owner, 0 if none */
michael@0 184 z_stream zstream; /* decompression structure */
michael@0 185
michael@0 186 #ifdef PNG_WRITE_SUPPORTED
michael@0 187 png_compression_bufferp zbuffer_list; /* Created on demand during write */
michael@0 188 uInt zbuffer_size; /* size of the actual buffer */
michael@0 189
michael@0 190 int zlib_level; /* holds zlib compression level */
michael@0 191 int zlib_method; /* holds zlib compression method */
michael@0 192 int zlib_window_bits; /* holds zlib compression window bits */
michael@0 193 int zlib_mem_level; /* holds zlib compression memory level */
michael@0 194 int zlib_strategy; /* holds zlib compression strategy */
michael@0 195 #endif
michael@0 196 /* Added at libpng 1.5.4 */
michael@0 197 #ifdef PNG_WRITE_CUSTOMIZE_ZTXT_COMPRESSION_SUPPORTED
michael@0 198 int zlib_text_level; /* holds zlib compression level */
michael@0 199 int zlib_text_method; /* holds zlib compression method */
michael@0 200 int zlib_text_window_bits; /* holds zlib compression window bits */
michael@0 201 int zlib_text_mem_level; /* holds zlib compression memory level */
michael@0 202 int zlib_text_strategy; /* holds zlib compression strategy */
michael@0 203 #endif
michael@0 204 /* End of material added at libpng 1.5.4 */
michael@0 205 /* Added at libpng 1.6.0 */
michael@0 206 #ifdef PNG_WRITE_SUPPORTED
michael@0 207 int zlib_set_level; /* Actual values set into the zstream on write */
michael@0 208 int zlib_set_method;
michael@0 209 int zlib_set_window_bits;
michael@0 210 int zlib_set_mem_level;
michael@0 211 int zlib_set_strategy;
michael@0 212 #endif
michael@0 213
michael@0 214 png_uint_32 width; /* width of image in pixels */
michael@0 215 png_uint_32 height; /* height of image in pixels */
michael@0 216 png_uint_32 num_rows; /* number of rows in current pass */
michael@0 217 png_uint_32 usr_width; /* width of row at start of write */
michael@0 218 png_size_t rowbytes; /* size of row in bytes */
michael@0 219 png_uint_32 iwidth; /* width of current interlaced row in pixels */
michael@0 220 png_uint_32 row_number; /* current row in interlace pass */
michael@0 221 png_uint_32 chunk_name; /* PNG_CHUNK() id of current chunk */
michael@0 222 png_bytep prev_row; /* buffer to save previous (unfiltered) row.
michael@0 223 * This is a pointer into big_prev_row
michael@0 224 */
michael@0 225 png_bytep row_buf; /* buffer to save current (unfiltered) row.
michael@0 226 * This is a pointer into big_row_buf
michael@0 227 */
michael@0 228 #ifdef PNG_WRITE_SUPPORTED
michael@0 229 png_bytep sub_row; /* buffer to save "sub" row when filtering */
michael@0 230 png_bytep up_row; /* buffer to save "up" row when filtering */
michael@0 231 png_bytep avg_row; /* buffer to save "avg" row when filtering */
michael@0 232 png_bytep paeth_row; /* buffer to save "Paeth" row when filtering */
michael@0 233 #endif
michael@0 234 png_size_t info_rowbytes; /* Added in 1.5.4: cache of updated row bytes */
michael@0 235
michael@0 236 png_uint_32 idat_size; /* current IDAT size for read */
michael@0 237 png_uint_32 crc; /* current chunk CRC value */
michael@0 238 png_colorp palette; /* palette from the input file */
michael@0 239 png_uint_16 num_palette; /* number of color entries in palette */
michael@0 240
michael@0 241 /* Added at libpng-1.5.10 */
michael@0 242 #ifdef PNG_CHECK_FOR_INVALID_INDEX_SUPPORTED
michael@0 243 int num_palette_max; /* maximum palette index found in IDAT */
michael@0 244 #endif
michael@0 245
michael@0 246 png_uint_16 num_trans; /* number of transparency values */
michael@0 247 png_byte compression; /* file compression type (always 0) */
michael@0 248 png_byte filter; /* file filter type (always 0) */
michael@0 249 png_byte interlaced; /* PNG_INTERLACE_NONE, PNG_INTERLACE_ADAM7 */
michael@0 250 png_byte pass; /* current interlace pass (0 - 6) */
michael@0 251 png_byte do_filter; /* row filter flags (see PNG_FILTER_ below ) */
michael@0 252 png_byte color_type; /* color type of file */
michael@0 253 png_byte bit_depth; /* bit depth of file */
michael@0 254 png_byte usr_bit_depth; /* bit depth of users row: write only */
michael@0 255 png_byte pixel_depth; /* number of bits per pixel */
michael@0 256 png_byte channels; /* number of channels in file */
michael@0 257 #ifdef PNG_WRITE_SUPPORTED
michael@0 258 png_byte usr_channels; /* channels at start of write: write only */
michael@0 259 #endif
michael@0 260 png_byte sig_bytes; /* magic bytes read/written from start of file */
michael@0 261 png_byte maximum_pixel_depth;
michael@0 262 /* pixel depth used for the row buffers */
michael@0 263 png_byte transformed_pixel_depth;
michael@0 264 /* pixel depth after read/write transforms */
michael@0 265 #if defined(PNG_READ_FILLER_SUPPORTED) || defined(PNG_WRITE_FILLER_SUPPORTED)
michael@0 266 png_uint_16 filler; /* filler bytes for pixel expansion */
michael@0 267 #endif
michael@0 268
michael@0 269 #if defined(PNG_bKGD_SUPPORTED) || defined(PNG_READ_BACKGROUND_SUPPORTED) ||\
michael@0 270 defined(PNG_READ_ALPHA_MODE_SUPPORTED)
michael@0 271 png_byte background_gamma_type;
michael@0 272 png_fixed_point background_gamma;
michael@0 273 png_color_16 background; /* background color in screen gamma space */
michael@0 274 #ifdef PNG_READ_GAMMA_SUPPORTED
michael@0 275 png_color_16 background_1; /* background normalized to gamma 1.0 */
michael@0 276 #endif
michael@0 277 #endif /* PNG_bKGD_SUPPORTED */
michael@0 278
michael@0 279 #ifdef PNG_WRITE_FLUSH_SUPPORTED
michael@0 280 png_flush_ptr output_flush_fn; /* Function for flushing output */
michael@0 281 png_uint_32 flush_dist; /* how many rows apart to flush, 0 - no flush */
michael@0 282 png_uint_32 flush_rows; /* number of rows written since last flush */
michael@0 283 #endif
michael@0 284
michael@0 285 #ifdef PNG_READ_GAMMA_SUPPORTED
michael@0 286 int gamma_shift; /* number of "insignificant" bits in 16-bit gamma */
michael@0 287 png_fixed_point screen_gamma; /* screen gamma value (display_exponent) */
michael@0 288
michael@0 289 png_bytep gamma_table; /* gamma table for 8-bit depth files */
michael@0 290 png_uint_16pp gamma_16_table; /* gamma table for 16-bit depth files */
michael@0 291 #if defined(PNG_READ_BACKGROUND_SUPPORTED) || \
michael@0 292 defined(PNG_READ_ALPHA_MODE_SUPPORTED) || \
michael@0 293 defined(PNG_READ_RGB_TO_GRAY_SUPPORTED)
michael@0 294 png_bytep gamma_from_1; /* converts from 1.0 to screen */
michael@0 295 png_bytep gamma_to_1; /* converts from file to 1.0 */
michael@0 296 png_uint_16pp gamma_16_from_1; /* converts from 1.0 to screen */
michael@0 297 png_uint_16pp gamma_16_to_1; /* converts from file to 1.0 */
michael@0 298 #endif /* READ_BACKGROUND || READ_ALPHA_MODE || RGB_TO_GRAY */
michael@0 299 #endif
michael@0 300
michael@0 301 #if defined(PNG_READ_GAMMA_SUPPORTED) || defined(PNG_sBIT_SUPPORTED)
michael@0 302 png_color_8 sig_bit; /* significant bits in each available channel */
michael@0 303 #endif
michael@0 304
michael@0 305 #if defined(PNG_READ_SHIFT_SUPPORTED) || defined(PNG_WRITE_SHIFT_SUPPORTED)
michael@0 306 png_color_8 shift; /* shift for significant bit tranformation */
michael@0 307 #endif
michael@0 308
michael@0 309 #if defined(PNG_tRNS_SUPPORTED) || defined(PNG_READ_BACKGROUND_SUPPORTED) \
michael@0 310 || defined(PNG_READ_EXPAND_SUPPORTED) || defined(PNG_READ_BACKGROUND_SUPPORTED)
michael@0 311 png_bytep trans_alpha; /* alpha values for paletted files */
michael@0 312 png_color_16 trans_color; /* transparent color for non-paletted files */
michael@0 313 #endif
michael@0 314
michael@0 315 png_read_status_ptr read_row_fn; /* called after each row is decoded */
michael@0 316 png_write_status_ptr write_row_fn; /* called after each row is encoded */
michael@0 317 #ifdef PNG_PROGRESSIVE_READ_SUPPORTED
michael@0 318 png_progressive_info_ptr info_fn; /* called after header data fully read */
michael@0 319 png_progressive_row_ptr row_fn; /* called after a prog. row is decoded */
michael@0 320 png_progressive_end_ptr end_fn; /* called after image is complete */
michael@0 321 png_bytep save_buffer_ptr; /* current location in save_buffer */
michael@0 322 png_bytep save_buffer; /* buffer for previously read data */
michael@0 323 png_bytep current_buffer_ptr; /* current location in current_buffer */
michael@0 324 png_bytep current_buffer; /* buffer for recently used data */
michael@0 325 png_uint_32 push_length; /* size of current input chunk */
michael@0 326 png_uint_32 skip_length; /* bytes to skip in input data */
michael@0 327 png_size_t save_buffer_size; /* amount of data now in save_buffer */
michael@0 328 png_size_t save_buffer_max; /* total size of save_buffer */
michael@0 329 png_size_t buffer_size; /* total amount of available input data */
michael@0 330 png_size_t current_buffer_size; /* amount of data now in current_buffer */
michael@0 331 int process_mode; /* what push library is currently doing */
michael@0 332 int cur_palette; /* current push library palette index */
michael@0 333
michael@0 334 #endif /* PNG_PROGRESSIVE_READ_SUPPORTED */
michael@0 335
michael@0 336 #if defined(__TURBOC__) && !defined(_Windows) && !defined(__FLAT__)
michael@0 337 /* For the Borland special 64K segment handler */
michael@0 338 png_bytepp offset_table_ptr;
michael@0 339 png_bytep offset_table;
michael@0 340 png_uint_16 offset_table_number;
michael@0 341 png_uint_16 offset_table_count;
michael@0 342 png_uint_16 offset_table_count_free;
michael@0 343 #endif
michael@0 344
michael@0 345 #ifdef PNG_READ_QUANTIZE_SUPPORTED
michael@0 346 png_bytep palette_lookup; /* lookup table for quantizing */
michael@0 347 png_bytep quantize_index; /* index translation for palette files */
michael@0 348 #endif
michael@0 349
michael@0 350 #ifdef PNG_WRITE_WEIGHTED_FILTER_SUPPORTED
michael@0 351 png_byte heuristic_method; /* heuristic for row filter selection */
michael@0 352 png_byte num_prev_filters; /* number of weights for previous rows */
michael@0 353 png_bytep prev_filters; /* filter type(s) of previous row(s) */
michael@0 354 png_uint_16p filter_weights; /* weight(s) for previous line(s) */
michael@0 355 png_uint_16p inv_filter_weights; /* 1/weight(s) for previous line(s) */
michael@0 356 png_uint_16p filter_costs; /* relative filter calculation cost */
michael@0 357 png_uint_16p inv_filter_costs; /* 1/relative filter calculation cost */
michael@0 358 #endif
michael@0 359
michael@0 360 /* Options */
michael@0 361 #ifdef PNG_SET_OPTION_SUPPORTED
michael@0 362 png_byte options; /* On/off state (up to 4 options) */
michael@0 363 #endif
michael@0 364
michael@0 365 #if PNG_LIBPNG_VER < 10700
michael@0 366 /* To do: remove this from libpng-1.7 */
michael@0 367 #ifdef PNG_TIME_RFC1123_SUPPORTED
michael@0 368 char time_buffer[29]; /* String to hold RFC 1123 time text */
michael@0 369 #endif
michael@0 370 #endif
michael@0 371
michael@0 372 /* New members added in libpng-1.0.6 */
michael@0 373
michael@0 374 png_uint_32 free_me; /* flags items libpng is responsible for freeing */
michael@0 375
michael@0 376 #ifdef PNG_USER_CHUNKS_SUPPORTED
michael@0 377 png_voidp user_chunk_ptr;
michael@0 378 #ifdef PNG_READ_USER_CHUNKS_SUPPORTED
michael@0 379 png_user_chunk_ptr read_user_chunk_fn; /* user read chunk handler */
michael@0 380 #endif
michael@0 381 #endif
michael@0 382
michael@0 383 #ifdef PNG_SET_UNKNOWN_CHUNKS_SUPPORTED
michael@0 384 int unknown_default; /* As PNG_HANDLE_* */
michael@0 385 unsigned int num_chunk_list; /* Number of entries in the list */
michael@0 386 png_bytep chunk_list; /* List of png_byte[5]; the textual chunk name
michael@0 387 * followed by a PNG_HANDLE_* byte */
michael@0 388 #endif
michael@0 389
michael@0 390 /* New members added in libpng-1.0.3 */
michael@0 391 #ifdef PNG_READ_RGB_TO_GRAY_SUPPORTED
michael@0 392 png_byte rgb_to_gray_status;
michael@0 393 /* Added in libpng 1.5.5 to record setting of coefficients: */
michael@0 394 png_byte rgb_to_gray_coefficients_set;
michael@0 395 /* These were changed from png_byte in libpng-1.0.6 */
michael@0 396 png_uint_16 rgb_to_gray_red_coeff;
michael@0 397 png_uint_16 rgb_to_gray_green_coeff;
michael@0 398 /* deleted in 1.5.5: rgb_to_gray_blue_coeff; */
michael@0 399 #endif
michael@0 400
michael@0 401 /* New member added in libpng-1.0.4 (renamed in 1.0.9) */
michael@0 402 #if defined(PNG_MNG_FEATURES_SUPPORTED)
michael@0 403 /* Changed from png_byte to png_uint_32 at version 1.2.0 */
michael@0 404 png_uint_32 mng_features_permitted;
michael@0 405 #endif
michael@0 406
michael@0 407 /* New member added in libpng-1.0.9, ifdef'ed out in 1.0.12, enabled in 1.2.0 */
michael@0 408 #ifdef PNG_MNG_FEATURES_SUPPORTED
michael@0 409 png_byte filter_type;
michael@0 410 #endif
michael@0 411
michael@0 412 #ifdef PNG_APNG_SUPPORTED
michael@0 413 png_uint_32 apng_flags;
michael@0 414 png_uint_32 next_seq_num; /* next fcTL/fdAT chunk sequence number */
michael@0 415 png_uint_32 first_frame_width;
michael@0 416 png_uint_32 first_frame_height;
michael@0 417
michael@0 418 #ifdef PNG_READ_APNG_SUPPORTED
michael@0 419 png_uint_32 num_frames_read; /* incremented after all image data of */
michael@0 420 /* a frame is read */
michael@0 421 #ifdef PNG_PROGRESSIVE_READ_SUPPORTED
michael@0 422 png_progressive_frame_ptr frame_info_fn; /* frame info read callback */
michael@0 423 png_progressive_frame_ptr frame_end_fn; /* frame data read callback */
michael@0 424 #endif
michael@0 425 #endif
michael@0 426
michael@0 427 #ifdef PNG_WRITE_APNG_SUPPORTED
michael@0 428 png_uint_32 num_frames_to_write;
michael@0 429 png_uint_32 num_frames_written;
michael@0 430 #endif
michael@0 431 #endif /* PNG_APNG_SUPPORTED */
michael@0 432
michael@0 433 /* New members added in libpng-1.2.0 */
michael@0 434
michael@0 435 /* New members added in libpng-1.0.2 but first enabled by default in 1.2.0 */
michael@0 436 #ifdef PNG_USER_MEM_SUPPORTED
michael@0 437 png_voidp mem_ptr; /* user supplied struct for mem functions */
michael@0 438 png_malloc_ptr malloc_fn; /* function for allocating memory */
michael@0 439 png_free_ptr free_fn; /* function for freeing memory */
michael@0 440 #endif
michael@0 441
michael@0 442 /* New member added in libpng-1.0.13 and 1.2.0 */
michael@0 443 png_bytep big_row_buf; /* buffer to save current (unfiltered) row */
michael@0 444
michael@0 445 #ifdef PNG_READ_QUANTIZE_SUPPORTED
michael@0 446 /* The following three members were added at version 1.0.14 and 1.2.4 */
michael@0 447 png_bytep quantize_sort; /* working sort array */
michael@0 448 png_bytep index_to_palette; /* where the original index currently is
michael@0 449 in the palette */
michael@0 450 png_bytep palette_to_index; /* which original index points to this
michael@0 451 palette color */
michael@0 452 #endif
michael@0 453
michael@0 454 /* New members added in libpng-1.0.16 and 1.2.6 */
michael@0 455 png_byte compression_type;
michael@0 456
michael@0 457 #ifdef PNG_USER_LIMITS_SUPPORTED
michael@0 458 png_uint_32 user_width_max;
michael@0 459 png_uint_32 user_height_max;
michael@0 460
michael@0 461 /* Added in libpng-1.4.0: Total number of sPLT, text, and unknown
michael@0 462 * chunks that can be stored (0 means unlimited).
michael@0 463 */
michael@0 464 png_uint_32 user_chunk_cache_max;
michael@0 465
michael@0 466 /* Total memory that a zTXt, sPLT, iTXt, iCCP, or unknown chunk
michael@0 467 * can occupy when decompressed. 0 means unlimited.
michael@0 468 */
michael@0 469 png_alloc_size_t user_chunk_malloc_max;
michael@0 470 #endif
michael@0 471
michael@0 472 /* New member added in libpng-1.0.25 and 1.2.17 */
michael@0 473 #ifdef PNG_READ_UNKNOWN_CHUNKS_SUPPORTED
michael@0 474 /* Temporary storage for unknown chunk that the library doesn't recognize,
michael@0 475 * used while reading the chunk.
michael@0 476 */
michael@0 477 png_unknown_chunk unknown_chunk;
michael@0 478 #endif
michael@0 479
michael@0 480 /* New member added in libpng-1.2.26 */
michael@0 481 png_size_t old_big_row_buf_size;
michael@0 482
michael@0 483 #ifdef PNG_READ_SUPPORTED
michael@0 484 /* New member added in libpng-1.2.30 */
michael@0 485 png_bytep read_buffer; /* buffer for reading chunk data */
michael@0 486 png_alloc_size_t read_buffer_size; /* current size of the buffer */
michael@0 487 #endif
michael@0 488 #ifdef PNG_SEQUENTIAL_READ_SUPPORTED
michael@0 489 uInt IDAT_read_size; /* limit on read buffer size for IDAT */
michael@0 490 #endif
michael@0 491
michael@0 492 #ifdef PNG_IO_STATE_SUPPORTED
michael@0 493 /* New member added in libpng-1.4.0 */
michael@0 494 png_uint_32 io_state;
michael@0 495 #endif
michael@0 496
michael@0 497 /* New member added in libpng-1.5.6 */
michael@0 498 png_bytep big_prev_row;
michael@0 499
michael@0 500 /* New member added in libpng-1.5.7 */
michael@0 501 void (*read_filter[PNG_FILTER_VALUE_LAST-1])(png_row_infop row_info,
michael@0 502 png_bytep row, png_const_bytep prev_row);
michael@0 503
michael@0 504 #ifdef PNG_READ_SUPPORTED
michael@0 505 #if defined(PNG_COLORSPACE_SUPPORTED) || defined(PNG_GAMMA_SUPPORTED)
michael@0 506 png_colorspace colorspace;
michael@0 507 #endif
michael@0 508 #endif
michael@0 509 };
michael@0 510 #endif /* PNGSTRUCT_H */

Mercurial Repository: The Tor Browser

Europalab SCM Repository Server

mercurial