| 1 |
|
|---|
| 2 | /* pngstruct.h - header file for PNG reference library
|
|---|
| 3 | *
|
|---|
| 4 | * Copyright (c) 2018-2022 Cosmin Truta
|
|---|
| 5 | * Copyright (c) 1998-2002,2004,2006-2018 Glenn Randers-Pehrson
|
|---|
| 6 | * Copyright (c) 1996-1997 Andreas Dilger
|
|---|
| 7 | * 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 | * maximum for size_t. The value can be overridden 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 | struct png_struct_def
|
|---|
| 144 | {
|
|---|
| 145 | #ifdef PNG_SETJMP_SUPPORTED
|
|---|
| 146 | jmp_buf jmp_buf_local; /* New name in 1.6.0 for jmp_buf in png_struct */
|
|---|
| 147 | png_longjmp_ptr longjmp_fn;/* setjmp non-local goto function. */
|
|---|
| 148 | jmp_buf *jmp_buf_ptr; /* passed to longjmp_fn */
|
|---|
| 149 | size_t jmp_buf_size; /* size of the above, if allocated */
|
|---|
| 150 | #endif
|
|---|
| 151 | png_error_ptr error_fn; /* function for printing errors and aborting */
|
|---|
| 152 | #ifdef PNG_WARNINGS_SUPPORTED
|
|---|
| 153 | png_error_ptr warning_fn; /* function for printing warnings */
|
|---|
| 154 | #endif
|
|---|
| 155 | png_voidp error_ptr; /* user supplied struct for error functions */
|
|---|
| 156 | png_rw_ptr write_data_fn; /* function for writing output data */
|
|---|
| 157 | png_rw_ptr read_data_fn; /* function for reading input data */
|
|---|
| 158 | png_voidp io_ptr; /* ptr to application struct for I/O functions */
|
|---|
| 159 |
|
|---|
| 160 | #ifdef PNG_READ_USER_TRANSFORM_SUPPORTED
|
|---|
| 161 | png_user_transform_ptr read_user_transform_fn; /* user read transform */
|
|---|
| 162 | #endif
|
|---|
| 163 |
|
|---|
| 164 | #ifdef PNG_WRITE_USER_TRANSFORM_SUPPORTED
|
|---|
| 165 | png_user_transform_ptr write_user_transform_fn; /* user write transform */
|
|---|
| 166 | #endif
|
|---|
| 167 |
|
|---|
| 168 | /* These were added in libpng-1.0.2 */
|
|---|
| 169 | #ifdef PNG_USER_TRANSFORM_PTR_SUPPORTED
|
|---|
| 170 | #if defined(PNG_READ_USER_TRANSFORM_SUPPORTED) || \
|
|---|
| 171 | defined(PNG_WRITE_USER_TRANSFORM_SUPPORTED)
|
|---|
| 172 | png_voidp user_transform_ptr; /* user supplied struct for user transform */
|
|---|
| 173 | png_byte user_transform_depth; /* bit depth of user transformed pixels */
|
|---|
| 174 | png_byte user_transform_channels; /* channels in user transformed pixels */
|
|---|
| 175 | #endif
|
|---|
| 176 | #endif
|
|---|
| 177 |
|
|---|
| 178 | png_uint_32 mode; /* tells us where we are in the PNG file */
|
|---|
| 179 | png_uint_32 flags; /* flags indicating various things to libpng */
|
|---|
| 180 | png_uint_32 transformations; /* which transformations to perform */
|
|---|
| 181 |
|
|---|
| 182 | png_uint_32 zowner; /* ID (chunk type) of zstream owner, 0 if none */
|
|---|
| 183 | z_stream zstream; /* decompression structure */
|
|---|
| 184 |
|
|---|
| 185 | #ifdef PNG_WRITE_SUPPORTED
|
|---|
| 186 | png_compression_bufferp zbuffer_list; /* Created on demand during write */
|
|---|
| 187 | uInt zbuffer_size; /* size of the actual buffer */
|
|---|
| 188 |
|
|---|
| 189 | int zlib_level; /* holds zlib compression level */
|
|---|
| 190 | int zlib_method; /* holds zlib compression method */
|
|---|
| 191 | int zlib_window_bits; /* holds zlib compression window bits */
|
|---|
| 192 | int zlib_mem_level; /* holds zlib compression memory level */
|
|---|
| 193 | int zlib_strategy; /* holds zlib compression strategy */
|
|---|
| 194 | #endif
|
|---|
| 195 | /* Added at libpng 1.5.4 */
|
|---|
| 196 | #ifdef PNG_WRITE_CUSTOMIZE_ZTXT_COMPRESSION_SUPPORTED
|
|---|
| 197 | int zlib_text_level; /* holds zlib compression level */
|
|---|
| 198 | int zlib_text_method; /* holds zlib compression method */
|
|---|
| 199 | int zlib_text_window_bits; /* holds zlib compression window bits */
|
|---|
| 200 | int zlib_text_mem_level; /* holds zlib compression memory level */
|
|---|
| 201 | int zlib_text_strategy; /* holds zlib compression strategy */
|
|---|
| 202 | #endif
|
|---|
| 203 | /* End of material added at libpng 1.5.4 */
|
|---|
| 204 | /* Added at libpng 1.6.0 */
|
|---|
| 205 | #ifdef PNG_WRITE_SUPPORTED
|
|---|
| 206 | int zlib_set_level; /* Actual values set into the zstream on write */
|
|---|
| 207 | int zlib_set_method;
|
|---|
| 208 | int zlib_set_window_bits;
|
|---|
| 209 | int zlib_set_mem_level;
|
|---|
| 210 | int zlib_set_strategy;
|
|---|
| 211 | #endif
|
|---|
| 212 |
|
|---|
| 213 | png_uint_32 width; /* width of image in pixels */
|
|---|
| 214 | png_uint_32 height; /* height of image in pixels */
|
|---|
| 215 | png_uint_32 num_rows; /* number of rows in current pass */
|
|---|
| 216 | png_uint_32 usr_width; /* width of row at start of write */
|
|---|
| 217 | size_t rowbytes; /* size of row in bytes */
|
|---|
| 218 | png_uint_32 iwidth; /* width of current interlaced row in pixels */
|
|---|
| 219 | png_uint_32 row_number; /* current row in interlace pass */
|
|---|
| 220 | png_uint_32 chunk_name; /* PNG_CHUNK() id of current chunk */
|
|---|
| 221 | png_bytep prev_row; /* buffer to save previous (unfiltered) row.
|
|---|
| 222 | * While reading this is a pointer into
|
|---|
| 223 | * big_prev_row; while writing it is separately
|
|---|
| 224 | * allocated if needed.
|
|---|
| 225 | */
|
|---|
| 226 | png_bytep row_buf; /* buffer to save current (unfiltered) row.
|
|---|
| 227 | * While reading, this is a pointer into
|
|---|
| 228 | * big_row_buf; while writing it is separately
|
|---|
| 229 | * allocated.
|
|---|
| 230 | */
|
|---|
| 231 | #ifdef PNG_WRITE_FILTER_SUPPORTED
|
|---|
| 232 | png_bytep try_row; /* buffer to save trial row when filtering */
|
|---|
| 233 | png_bytep tst_row; /* buffer to save best trial row when filtering */
|
|---|
| 234 | #endif
|
|---|
| 235 | size_t info_rowbytes; /* Added in 1.5.4: cache of updated row bytes */
|
|---|
| 236 |
|
|---|
| 237 | png_uint_32 idat_size; /* current IDAT size for read */
|
|---|
| 238 | png_uint_32 crc; /* current chunk CRC value */
|
|---|
| 239 | png_colorp palette; /* palette from the input file */
|
|---|
| 240 | png_uint_16 num_palette; /* number of color entries in palette */
|
|---|
| 241 |
|
|---|
| 242 | /* Added at libpng-1.5.10 */
|
|---|
| 243 | #ifdef PNG_CHECK_FOR_INVALID_INDEX_SUPPORTED
|
|---|
| 244 | int num_palette_max; /* maximum palette index found in IDAT */
|
|---|
| 245 | #endif
|
|---|
| 246 |
|
|---|
| 247 | png_uint_16 num_trans; /* number of transparency values */
|
|---|
| 248 | png_byte compression; /* file compression type (always 0) */
|
|---|
| 249 | png_byte filter; /* file filter type (always 0) */
|
|---|
| 250 | png_byte interlaced; /* PNG_INTERLACE_NONE, PNG_INTERLACE_ADAM7 */
|
|---|
| 251 | png_byte pass; /* current interlace pass (0 - 6) */
|
|---|
| 252 | png_byte do_filter; /* row filter flags (see PNG_FILTER_ in png.h ) */
|
|---|
| 253 | png_byte color_type; /* color type of file */
|
|---|
| 254 | png_byte bit_depth; /* bit depth of file */
|
|---|
| 255 | png_byte usr_bit_depth; /* bit depth of users row: write only */
|
|---|
| 256 | png_byte pixel_depth; /* number of bits per pixel */
|
|---|
| 257 | png_byte channels; /* number of channels in file */
|
|---|
| 258 | #ifdef PNG_WRITE_SUPPORTED
|
|---|
| 259 | png_byte usr_channels; /* channels at start of write: write only */
|
|---|
| 260 | #endif
|
|---|
| 261 | png_byte sig_bytes; /* magic bytes read/written from start of file */
|
|---|
| 262 | png_byte maximum_pixel_depth;
|
|---|
| 263 | /* pixel depth used for the row buffers */
|
|---|
| 264 | png_byte transformed_pixel_depth;
|
|---|
| 265 | /* pixel depth after read/write transforms */
|
|---|
| 266 | #if ZLIB_VERNUM >= 0x1240
|
|---|
| 267 | png_byte zstream_start; /* at start of an input zlib stream */
|
|---|
| 268 | #endif /* Zlib >= 1.2.4 */
|
|---|
| 269 | #if defined(PNG_READ_FILLER_SUPPORTED) || defined(PNG_WRITE_FILLER_SUPPORTED)
|
|---|
| 270 | png_uint_16 filler; /* filler bytes for pixel expansion */
|
|---|
| 271 | #endif
|
|---|
| 272 |
|
|---|
| 273 | #if defined(PNG_bKGD_SUPPORTED) || defined(PNG_READ_BACKGROUND_SUPPORTED) ||\
|
|---|
| 274 | defined(PNG_READ_ALPHA_MODE_SUPPORTED)
|
|---|
| 275 | png_byte background_gamma_type;
|
|---|
| 276 | png_fixed_point background_gamma;
|
|---|
| 277 | png_color_16 background; /* background color in screen gamma space */
|
|---|
| 278 | #ifdef PNG_READ_GAMMA_SUPPORTED
|
|---|
| 279 | png_color_16 background_1; /* background normalized to gamma 1.0 */
|
|---|
| 280 | #endif
|
|---|
| 281 | #endif /* bKGD */
|
|---|
| 282 |
|
|---|
| 283 | #ifdef PNG_WRITE_FLUSH_SUPPORTED
|
|---|
| 284 | png_flush_ptr output_flush_fn; /* Function for flushing output */
|
|---|
| 285 | png_uint_32 flush_dist; /* how many rows apart to flush, 0 - no flush */
|
|---|
| 286 | png_uint_32 flush_rows; /* number of rows written since last flush */
|
|---|
| 287 | #endif
|
|---|
| 288 |
|
|---|
| 289 | #ifdef PNG_READ_GAMMA_SUPPORTED
|
|---|
| 290 | int gamma_shift; /* number of "insignificant" bits in 16-bit gamma */
|
|---|
| 291 | png_fixed_point screen_gamma; /* screen gamma value (display_exponent) */
|
|---|
| 292 |
|
|---|
| 293 | png_bytep gamma_table; /* gamma table for 8-bit depth files */
|
|---|
| 294 | png_uint_16pp gamma_16_table; /* gamma table for 16-bit depth files */
|
|---|
| 295 | #if defined(PNG_READ_BACKGROUND_SUPPORTED) || \
|
|---|
| 296 | defined(PNG_READ_ALPHA_MODE_SUPPORTED) || \
|
|---|
| 297 | defined(PNG_READ_RGB_TO_GRAY_SUPPORTED)
|
|---|
| 298 | png_bytep gamma_from_1; /* converts from 1.0 to screen */
|
|---|
| 299 | png_bytep gamma_to_1; /* converts from file to 1.0 */
|
|---|
| 300 | png_uint_16pp gamma_16_from_1; /* converts from 1.0 to screen */
|
|---|
| 301 | png_uint_16pp gamma_16_to_1; /* converts from file to 1.0 */
|
|---|
| 302 | #endif /* READ_BACKGROUND || READ_ALPHA_MODE || RGB_TO_GRAY */
|
|---|
| 303 | #endif
|
|---|
| 304 |
|
|---|
| 305 | #if defined(PNG_READ_GAMMA_SUPPORTED) || defined(PNG_sBIT_SUPPORTED)
|
|---|
| 306 | png_color_8 sig_bit; /* significant bits in each available channel */
|
|---|
| 307 | #endif
|
|---|
| 308 |
|
|---|
| 309 | #if defined(PNG_READ_SHIFT_SUPPORTED) || defined(PNG_WRITE_SHIFT_SUPPORTED)
|
|---|
| 310 | png_color_8 shift; /* shift for significant bit transformation */
|
|---|
| 311 | #endif
|
|---|
| 312 |
|
|---|
| 313 | #if defined(PNG_tRNS_SUPPORTED) || defined(PNG_READ_BACKGROUND_SUPPORTED) \
|
|---|
| 314 | || defined(PNG_READ_EXPAND_SUPPORTED) || defined(PNG_READ_BACKGROUND_SUPPORTED)
|
|---|
| 315 | png_bytep trans_alpha; /* alpha values for paletted files */
|
|---|
| 316 | png_color_16 trans_color; /* transparent color for non-paletted files */
|
|---|
| 317 | #endif
|
|---|
| 318 |
|
|---|
| 319 | png_read_status_ptr read_row_fn; /* called after each row is decoded */
|
|---|
| 320 | png_write_status_ptr write_row_fn; /* called after each row is encoded */
|
|---|
| 321 | #ifdef PNG_PROGRESSIVE_READ_SUPPORTED
|
|---|
| 322 | png_progressive_info_ptr info_fn; /* called after header data fully read */
|
|---|
| 323 | png_progressive_row_ptr row_fn; /* called after a prog. row is decoded */
|
|---|
| 324 | png_progressive_end_ptr end_fn; /* called after image is complete */
|
|---|
| 325 | png_bytep save_buffer_ptr; /* current location in save_buffer */
|
|---|
| 326 | png_bytep save_buffer; /* buffer for previously read data */
|
|---|
| 327 | png_bytep current_buffer_ptr; /* current location in current_buffer */
|
|---|
| 328 | png_bytep current_buffer; /* buffer for recently used data */
|
|---|
| 329 | png_uint_32 push_length; /* size of current input chunk */
|
|---|
| 330 | png_uint_32 skip_length; /* bytes to skip in input data */
|
|---|
| 331 | size_t save_buffer_size; /* amount of data now in save_buffer */
|
|---|
| 332 | size_t save_buffer_max; /* total size of save_buffer */
|
|---|
| 333 | size_t buffer_size; /* total amount of available input data */
|
|---|
| 334 | size_t current_buffer_size; /* amount of data now in current_buffer */
|
|---|
| 335 | int process_mode; /* what push library is currently doing */
|
|---|
| 336 | int cur_palette; /* current push library palette index */
|
|---|
| 337 | #endif /* PROGRESSIVE_READ */
|
|---|
| 338 |
|
|---|
| 339 | #ifdef PNG_READ_QUANTIZE_SUPPORTED
|
|---|
| 340 | png_bytep palette_lookup; /* lookup table for quantizing */
|
|---|
| 341 | png_bytep quantize_index; /* index translation for palette files */
|
|---|
| 342 | #endif
|
|---|
| 343 |
|
|---|
| 344 | /* Options */
|
|---|
| 345 | #ifdef PNG_SET_OPTION_SUPPORTED
|
|---|
| 346 | png_uint_32 options; /* On/off state (up to 16 options) */
|
|---|
| 347 | #endif
|
|---|
| 348 |
|
|---|
| 349 | #if PNG_LIBPNG_VER < 10700
|
|---|
| 350 | /* To do: remove this from libpng-1.7 */
|
|---|
| 351 | #ifdef PNG_TIME_RFC1123_SUPPORTED
|
|---|
| 352 | char time_buffer[29]; /* String to hold RFC 1123 time text */
|
|---|
| 353 | #endif
|
|---|
| 354 | #endif
|
|---|
| 355 |
|
|---|
| 356 | /* New members added in libpng-1.0.6 */
|
|---|
| 357 |
|
|---|
| 358 | png_uint_32 free_me; /* flags items libpng is responsible for freeing */
|
|---|
| 359 |
|
|---|
| 360 | #ifdef PNG_USER_CHUNKS_SUPPORTED
|
|---|
| 361 | png_voidp user_chunk_ptr;
|
|---|
| 362 | #ifdef PNG_READ_USER_CHUNKS_SUPPORTED
|
|---|
| 363 | png_user_chunk_ptr read_user_chunk_fn; /* user read chunk handler */
|
|---|
| 364 | #endif
|
|---|
| 365 | #endif
|
|---|
| 366 |
|
|---|
| 367 | #ifdef PNG_SET_UNKNOWN_CHUNKS_SUPPORTED
|
|---|
| 368 | int unknown_default; /* As PNG_HANDLE_* */
|
|---|
| 369 | unsigned int num_chunk_list; /* Number of entries in the list */
|
|---|
| 370 | png_bytep chunk_list; /* List of png_byte[5]; the textual chunk name
|
|---|
| 371 | * followed by a PNG_HANDLE_* byte */
|
|---|
| 372 | #endif
|
|---|
| 373 |
|
|---|
| 374 | /* New members added in libpng-1.0.3 */
|
|---|
| 375 | #ifdef PNG_READ_RGB_TO_GRAY_SUPPORTED
|
|---|
| 376 | png_byte rgb_to_gray_status;
|
|---|
| 377 | /* Added in libpng 1.5.5 to record setting of coefficients: */
|
|---|
| 378 | png_byte rgb_to_gray_coefficients_set;
|
|---|
| 379 | /* These were changed from png_byte in libpng-1.0.6 */
|
|---|
| 380 | png_uint_16 rgb_to_gray_red_coeff;
|
|---|
| 381 | png_uint_16 rgb_to_gray_green_coeff;
|
|---|
| 382 | /* deleted in 1.5.5: rgb_to_gray_blue_coeff; */
|
|---|
| 383 | #endif
|
|---|
| 384 |
|
|---|
| 385 | /* New member added in libpng-1.6.36 */
|
|---|
| 386 | #if defined(PNG_READ_EXPAND_SUPPORTED) && \
|
|---|
| 387 | defined(PNG_ARM_NEON_IMPLEMENTATION)
|
|---|
| 388 | png_bytep riffled_palette; /* buffer for accelerated palette expansion */
|
|---|
| 389 | #endif
|
|---|
| 390 |
|
|---|
| 391 | /* New member added in libpng-1.0.4 (renamed in 1.0.9) */
|
|---|
| 392 | #if defined(PNG_MNG_FEATURES_SUPPORTED)
|
|---|
| 393 | /* Changed from png_byte to png_uint_32 at version 1.2.0 */
|
|---|
| 394 | png_uint_32 mng_features_permitted;
|
|---|
| 395 | #endif
|
|---|
| 396 |
|
|---|
| 397 | /* New member added in libpng-1.0.9, ifdef'ed out in 1.0.12, enabled in 1.2.0 */
|
|---|
| 398 | #ifdef PNG_MNG_FEATURES_SUPPORTED
|
|---|
| 399 | png_byte filter_type;
|
|---|
| 400 | #endif
|
|---|
| 401 |
|
|---|
| 402 | /* New members added in libpng-1.2.0 */
|
|---|
| 403 |
|
|---|
| 404 | /* New members added in libpng-1.0.2 but first enabled by default in 1.2.0 */
|
|---|
| 405 | #ifdef PNG_USER_MEM_SUPPORTED
|
|---|
| 406 | png_voidp mem_ptr; /* user supplied struct for mem functions */
|
|---|
| 407 | png_malloc_ptr malloc_fn; /* function for allocating memory */
|
|---|
| 408 | png_free_ptr free_fn; /* function for freeing memory */
|
|---|
| 409 | #endif
|
|---|
| 410 |
|
|---|
| 411 | /* New member added in libpng-1.0.13 and 1.2.0 */
|
|---|
| 412 | png_bytep big_row_buf; /* buffer to save current (unfiltered) row */
|
|---|
| 413 |
|
|---|
| 414 | #ifdef PNG_READ_QUANTIZE_SUPPORTED
|
|---|
| 415 | /* The following three members were added at version 1.0.14 and 1.2.4 */
|
|---|
| 416 | png_bytep quantize_sort; /* working sort array */
|
|---|
| 417 | png_bytep index_to_palette; /* where the original index currently is
|
|---|
| 418 | in the palette */
|
|---|
| 419 | png_bytep palette_to_index; /* which original index points to this
|
|---|
| 420 | palette color */
|
|---|
| 421 | #endif
|
|---|
| 422 |
|
|---|
| 423 | /* New members added in libpng-1.0.16 and 1.2.6 */
|
|---|
| 424 | png_byte compression_type;
|
|---|
| 425 |
|
|---|
| 426 | #ifdef PNG_USER_LIMITS_SUPPORTED
|
|---|
| 427 | png_uint_32 user_width_max;
|
|---|
| 428 | png_uint_32 user_height_max;
|
|---|
| 429 |
|
|---|
| 430 | /* Added in libpng-1.4.0: Total number of sPLT, text, and unknown
|
|---|
| 431 | * chunks that can be stored (0 means unlimited).
|
|---|
| 432 | */
|
|---|
| 433 | png_uint_32 user_chunk_cache_max;
|
|---|
| 434 |
|
|---|
| 435 | /* Total memory that a zTXt, sPLT, iTXt, iCCP, or unknown chunk
|
|---|
| 436 | * can occupy when decompressed. 0 means unlimited.
|
|---|
| 437 | */
|
|---|
| 438 | png_alloc_size_t user_chunk_malloc_max;
|
|---|
| 439 | #endif
|
|---|
| 440 |
|
|---|
| 441 | /* New member added in libpng-1.0.25 and 1.2.17 */
|
|---|
| 442 | #ifdef PNG_READ_UNKNOWN_CHUNKS_SUPPORTED
|
|---|
| 443 | /* Temporary storage for unknown chunk that the library doesn't recognize,
|
|---|
| 444 | * used while reading the chunk.
|
|---|
| 445 | */
|
|---|
| 446 | png_unknown_chunk unknown_chunk;
|
|---|
| 447 | #endif
|
|---|
| 448 |
|
|---|
| 449 | /* New member added in libpng-1.2.26 */
|
|---|
| 450 | size_t old_big_row_buf_size;
|
|---|
| 451 |
|
|---|
| 452 | #ifdef PNG_READ_SUPPORTED
|
|---|
| 453 | /* New member added in libpng-1.2.30 */
|
|---|
| 454 | png_bytep read_buffer; /* buffer for reading chunk data */
|
|---|
| 455 | png_alloc_size_t read_buffer_size; /* current size of the buffer */
|
|---|
| 456 | #endif
|
|---|
| 457 | #ifdef PNG_SEQUENTIAL_READ_SUPPORTED
|
|---|
| 458 | uInt IDAT_read_size; /* limit on read buffer size for IDAT */
|
|---|
| 459 | #endif
|
|---|
| 460 |
|
|---|
| 461 | #ifdef PNG_IO_STATE_SUPPORTED
|
|---|
| 462 | /* New member added in libpng-1.4.0 */
|
|---|
| 463 | png_uint_32 io_state;
|
|---|
| 464 | #endif
|
|---|
| 465 |
|
|---|
| 466 | /* New member added in libpng-1.5.6 */
|
|---|
| 467 | png_bytep big_prev_row;
|
|---|
| 468 |
|
|---|
| 469 | /* New member added in libpng-1.5.7 */
|
|---|
| 470 | void (*read_filter[PNG_FILTER_VALUE_LAST-1])(png_row_infop row_info,
|
|---|
| 471 | png_bytep row, png_const_bytep prev_row);
|
|---|
| 472 |
|
|---|
| 473 | #ifdef PNG_READ_SUPPORTED
|
|---|
| 474 | #if defined(PNG_COLORSPACE_SUPPORTED) || defined(PNG_GAMMA_SUPPORTED)
|
|---|
| 475 | png_colorspace colorspace;
|
|---|
| 476 | #endif
|
|---|
| 477 | #endif
|
|---|
| 478 | };
|
|---|
| 479 | #endif /* PNGSTRUCT_H */
|
|---|
