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| 1 /* | |
| 2 * jpeglib.h | |
| 3 * | |
| 4 * Copyright (C) 1991-1998, Thomas G. Lane. | |
| 5 * This file is part of the Independent JPEG Group's software. | |
| 6 * For conditions of distribution and use, see the accompanying README file. | |
| 7 * | |
| 8 * This file defines the application interface for the JPEG library. | |
| 9 * Most applications using the library need only include this file, | |
| 10 * and perhaps jerror.h if they want to know the exact error codes. | |
| 11 */ | |
| 12 | |
| 13 #ifndef JPEGLIB_H | |
| 14 #define JPEGLIB_H | |
| 15 | |
| 16 #define FOXIT_PREFIX(origName) FPDFAPIJPEG_##origName | |
| 17 | |
| 18 #define jcopy_block_row FOXIT_PREFIX(jcopy_block_row) | |
| 19 #define jcopy_sample_rows FOXIT_PREFIX(jcopy_sample_rows) | |
| 20 #define jdiv_round_up FOXIT_PREFIX(jdiv_round_up) | |
| 21 #define jinit_1pass_quantizer FOXIT_PREFIX(jinit_1pass_quantizer) | |
| 22 #define jinit_2pass_quantizer FOXIT_PREFIX(jinit_2pass_quantizer) | |
| 23 #define jinit_color_deconverter FOXIT_PREFIX(jinit_color_deconverter) | |
| 24 #define jinit_d_coef_controller FOXIT_PREFIX(jinit_d_coef_controller) | |
| 25 #define jinit_d_main_controller FOXIT_PREFIX(jinit_d_main_controller) | |
| 26 #define jinit_d_post_controller FOXIT_PREFIX(jinit_d_post_controller) | |
| 27 #define jinit_huff_decoder FOXIT_PREFIX(jinit_huff_decoder) | |
| 28 #define jinit_input_controller FOXIT_PREFIX(jinit_input_controller) | |
| 29 #define jinit_inverse_dct FOXIT_PREFIX(jinit_inverse_dct) | |
| 30 #define jinit_marker_reader FOXIT_PREFIX(jinit_marker_reader) | |
| 31 #define jinit_master_decompress FOXIT_PREFIX(jinit_master_decompress) | |
| 32 #define jinit_memory_mgr FOXIT_PREFIX(jinit_memory_mgr) | |
| 33 #define jinit_merged_upsampler FOXIT_PREFIX(jinit_merged_upsampler) | |
| 34 #define jinit_phuff_decoder FOXIT_PREFIX(jinit_phuff_decoder) | |
| 35 #define jinit_upsampler FOXIT_PREFIX(jinit_upsampler) | |
| 36 #define jpeg_CreateDecompress FOXIT_PREFIX(jpeg_CreateDecompress) | |
| 37 #define jpeg_abort FOXIT_PREFIX(jpeg_abort) | |
| 38 #define jpeg_abort_decompress FOXIT_PREFIX(jpeg_abort_decompress) | |
| 39 #define jpeg_alloc_huff_table FOXIT_PREFIX(jpeg_alloc_huff_table) | |
| 40 #define jpeg_alloc_quant_table FOXIT_PREFIX(jpeg_alloc_quant_table) | |
| 41 #define jpeg_calc_output_dimensions FOXIT_PREFIX(jpeg_calc_output_dimensions) | |
| 42 #define jpeg_consume_input FOXIT_PREFIX(jpeg_consume_input) | |
| 43 #define jpeg_destroy FOXIT_PREFIX(jpeg_destroy) | |
| 44 #define jpeg_destroy_decompress FOXIT_PREFIX(jpeg_destroy_decompress) | |
| 45 #define jpeg_fill_bit_buffer FOXIT_PREFIX(jpeg_fill_bit_buffer) | |
| 46 #define jpeg_finish_decompress FOXIT_PREFIX(jpeg_finish_decompress) | |
| 47 #define jpeg_finish_output FOXIT_PREFIX(jpeg_finish_output) | |
| 48 #define jpeg_free_large FOXIT_PREFIX(jpeg_free_large) | |
| 49 #define jpeg_free_small FOXIT_PREFIX(jpeg_free_small) | |
| 50 #define jpeg_get_large FOXIT_PREFIX(jpeg_get_large) | |
| 51 #define jpeg_get_small FOXIT_PREFIX(jpeg_get_small) | |
| 52 #define jpeg_has_multiple_scans FOXIT_PREFIX(jpeg_has_multiple_scans) | |
| 53 #define jpeg_huff_decode FOXIT_PREFIX(jpeg_huff_decode) | |
| 54 #define jpeg_idct_1x1 FOXIT_PREFIX(jpeg_idct_1x1) | |
| 55 #define jpeg_idct_2x2 FOXIT_PREFIX(jpeg_idct_2x2) | |
| 56 #define jpeg_idct_4x4 FOXIT_PREFIX(jpeg_idct_4x4) | |
| 57 #define jpeg_idct_float FOXIT_PREFIX(jpeg_idct_float) | |
| 58 #define jpeg_idct_ifast FOXIT_PREFIX(jpeg_idct_ifast) | |
| 59 #define jpeg_idct_islow FOXIT_PREFIX(jpeg_idct_islow) | |
| 60 #define jpeg_input_complete FOXIT_PREFIX(jpeg_input_complete) | |
| 61 #define jpeg_make_d_derived_tbl FOXIT_PREFIX(jpeg_make_d_derived_tbl) | |
| 62 #define jpeg_mem_available FOXIT_PREFIX(jpeg_mem_available) | |
| 63 #define jpeg_mem_init FOXIT_PREFIX(jpeg_mem_init) | |
| 64 #define jpeg_mem_term FOXIT_PREFIX(jpeg_mem_term) | |
| 65 #define jpeg_natural_order FOXIT_PREFIX(jpeg_natural_order) | |
| 66 #define jpeg_new_colormap FOXIT_PREFIX(jpeg_new_colormap) | |
| 67 #define jpeg_open_backing_store FOXIT_PREFIX(jpeg_open_backing_store) | |
| 68 #define jpeg_read_coefficients FOXIT_PREFIX(jpeg_read_coefficients) | |
| 69 #define jpeg_read_header FOXIT_PREFIX(jpeg_read_header) | |
| 70 #define jpeg_read_raw_data FOXIT_PREFIX(jpeg_read_raw_data) | |
| 71 #define jpeg_read_scanlines FOXIT_PREFIX(jpeg_read_scanlines) | |
| 72 #define jpeg_resync_to_restart FOXIT_PREFIX(jpeg_resync_to_restart) | |
| 73 #define jpeg_save_markers FOXIT_PREFIX(jpeg_save_markers) | |
| 74 #define jpeg_set_marker_processor FOXIT_PREFIX(jpeg_set_marker_processor) | |
| 75 #define jpeg_start_decompress FOXIT_PREFIX(jpeg_start_decompress) | |
| 76 #define jpeg_start_output FOXIT_PREFIX(jpeg_start_output) | |
| 77 #define jpeg_std_error FOXIT_PREFIX(jpeg_std_error) | |
| 78 #define jpeg_std_message_table FOXIT_PREFIX(jpeg_std_message_table) | |
| 79 #define jpeg_stdio_src FOXIT_PREFIX(jpeg_stdio_src) | |
| 80 #define jround_up FOXIT_PREFIX(jround_up) | |
| 81 #define jzero_far FOXIT_PREFIX(jzero_far) | |
| 82 | |
| 83 /* | |
| 84 * First we include the configuration files that record how this | |
| 85 * installation of the JPEG library is set up. jconfig.h can be | |
| 86 * generated automatically for many systems. jmorecfg.h contains | |
| 87 * manual configuration options that most people need not worry about. | |
| 88 */ | |
| 89 | |
| 90 #ifndef JCONFIG_INCLUDED /* in case jinclude.h already did */ | |
| 91 #include "jconfig.h" /* widely used configuration options */ | |
| 92 #endif | |
| 93 #include "jmorecfg.h" /* seldom changed options */ | |
| 94 | |
| 95 | |
| 96 /* Version ID for the JPEG library. | |
| 97 * Might be useful for tests like "#if JPEG_LIB_VERSION >= 60". | |
| 98 */ | |
| 99 | |
| 100 #define JPEG_LIB_VERSION 62 /* Version 6b */ | |
| 101 | |
| 102 | |
| 103 /* Various constants determining the sizes of things. | |
| 104 * All of these are specified by the JPEG standard, so don't change them | |
| 105 * if you want to be compatible. | |
| 106 */ | |
| 107 | |
| 108 #define DCTSIZE 8 /* The basic DCT block is 8x8 samples */ | |
| 109 #define DCTSIZE2 64 /* DCTSIZE squared; # of elements in a block */ | |
| 110 #define NUM_QUANT_TBLS 4 /* Quantization tables are numbered 0..3 */ | |
| 111 #define NUM_HUFF_TBLS 4 /* Huffman tables are numbered 0..3 */ | |
| 112 #define NUM_ARITH_TBLS 16 /* Arith-coding tables are numbered 0..15 */ | |
| 113 #define MAX_COMPS_IN_SCAN 4 /* JPEG limit on # of components in one scan */ | |
| 114 #define MAX_SAMP_FACTOR 4 /* JPEG limit on sampling factors */ | |
| 115 /* Unfortunately, some bozo at Adobe saw no reason to be bound by the standard; | |
| 116 * the PostScript DCT filter can emit files with many more than 10 blocks/MCU. | |
| 117 * If you happen to run across such a file, you can up D_MAX_BLOCKS_IN_MCU | |
| 118 * to handle it. We even let you do this from the jconfig.h file. However, | |
| 119 * we strongly discourage changing C_MAX_BLOCKS_IN_MCU; just because Adobe | |
| 120 * sometimes emits noncompliant files doesn't mean you should too. | |
| 121 */ | |
| 122 #define C_MAX_BLOCKS_IN_MCU 10 /* compressor's limit on blocks per MCU */ | |
| 123 #ifndef D_MAX_BLOCKS_IN_MCU | |
| 124 #define D_MAX_BLOCKS_IN_MCU 10 /* decompressor's limit on blocks per MCU */ | |
| 125 #endif | |
| 126 | |
| 127 | |
| 128 /* Data structures for images (arrays of samples and of DCT coefficients). | |
| 129 * On 80x86 machines, the image arrays are too big for near pointers, | |
| 130 * but the pointer arrays can fit in near memory. | |
| 131 */ | |
| 132 | |
| 133 typedef JSAMPLE *JSAMPROW; /* ptr to one image row of pixel samples. */ | |
| 134 typedef JSAMPROW *JSAMPARRAY; /* ptr to some rows (a 2-D sample array) */ | |
| 135 typedef JSAMPARRAY *JSAMPIMAGE; /* a 3-D sample array: top index is color */ | |
| 136 | |
| 137 typedef JCOEF JBLOCK[DCTSIZE2]; /* one block of coefficients */ | |
| 138 typedef JBLOCK *JBLOCKROW; /* pointer to one row of coefficient blocks */ | |
| 139 typedef JBLOCKROW *JBLOCKARRAY; /* a 2-D array of coefficient blocks */ | |
| 140 typedef JBLOCKARRAY *JBLOCKIMAGE; /* a 3-D array of coefficient blocks */ | |
| 141 | |
| 142 typedef JCOEF *JCOEFPTR; /* useful in a couple of places */ | |
| 143 | |
| 144 | |
| 145 /* Types for JPEG compression parameters and working tables. */ | |
| 146 | |
| 147 | |
| 148 /* DCT coefficient quantization tables. */ | |
| 149 | |
| 150 typedef struct { | |
| 151 /* This array gives the coefficient quantizers in natural array order | |
| 152 * (not the zigzag order in which they are stored in a JPEG DQT marker). | |
| 153 * CAUTION: IJG versions prior to v6a kept this array in zigzag order. | |
| 154 */ | |
| 155 UINT16 quantval[DCTSIZE2]; /* quantization step for each coefficient */ | |
| 156 /* This field is used only during compression. It's initialized FALSE when | |
| 157 * the table is created, and set TRUE when it's been output to the file. | |
| 158 * You could suppress output of a table by setting this to TRUE. | |
| 159 * (See jpeg_suppress_tables for an example.) | |
| 160 */ | |
| 161 boolean sent_table; /* TRUE when table has been output */ | |
| 162 } JQUANT_TBL; | |
| 163 | |
| 164 | |
| 165 /* Huffman coding tables. */ | |
| 166 | |
| 167 typedef struct { | |
| 168 /* These two fields directly represent the contents of a JPEG DHT marker */ | |
| 169 UINT8 bits[17]; /* bits[k] = # of symbols with codes of */ | |
| 170 /* length k bits; bits[0] is unused */ | |
| 171 UINT8 huffval[256]; /* The symbols, in order of incr code length */ | |
| 172 /* This field is used only during compression. It's initialized FALSE when | |
| 173 * the table is created, and set TRUE when it's been output to the file. | |
| 174 * You could suppress output of a table by setting this to TRUE. | |
| 175 * (See jpeg_suppress_tables for an example.) | |
| 176 */ | |
| 177 boolean sent_table; /* TRUE when table has been output */ | |
| 178 } JHUFF_TBL; | |
| 179 | |
| 180 | |
| 181 /* Basic info about one component (color channel). */ | |
| 182 | |
| 183 typedef struct { | |
| 184 /* These values are fixed over the whole image. */ | |
| 185 /* For compression, they must be supplied by parameter setup; */ | |
| 186 /* for decompression, they are read from the SOF marker. */ | |
| 187 int component_id; /* identifier for this component (0..255) */ | |
| 188 int component_index; /* its index in SOF or cinfo->comp_info[] */ | |
| 189 int h_samp_factor; /* horizontal sampling factor (1..4) */ | |
| 190 int v_samp_factor; /* vertical sampling factor (1..4) */ | |
| 191 int quant_tbl_no; /* quantization table selector (0..3) */ | |
| 192 /* These values may vary between scans. */ | |
| 193 /* For compression, they must be supplied by parameter setup; */ | |
| 194 /* for decompression, they are read from the SOS marker. */ | |
| 195 /* The decompressor output side may not use these variables. */ | |
| 196 int dc_tbl_no; /* DC entropy table selector (0..3) */ | |
| 197 int ac_tbl_no; /* AC entropy table selector (0..3) */ | |
| 198 | |
| 199 /* Remaining fields should be treated as private by applications. */ | |
| 200 | |
| 201 /* These values are computed during compression or decompression startup: */ | |
| 202 /* Component's size in DCT blocks. | |
| 203 * Any dummy blocks added to complete an MCU are not counted; therefore | |
| 204 * these values do not depend on whether a scan is interleaved or not. | |
| 205 */ | |
| 206 JDIMENSION width_in_blocks; | |
| 207 JDIMENSION height_in_blocks; | |
| 208 /* Size of a DCT block in samples. Always DCTSIZE for compression. | |
| 209 * For decompression this is the size of the output from one DCT block, | |
| 210 * reflecting any scaling we choose to apply during the IDCT step. | |
| 211 * Values of 1,2,4,8 are likely to be supported. Note that different | |
| 212 * components may receive different IDCT scalings. | |
| 213 */ | |
| 214 int DCT_scaled_size; | |
| 215 /* The downsampled dimensions are the component's actual, unpadded number | |
| 216 * of samples at the main buffer (preprocessing/compression interface), thus | |
| 217 * downsampled_width = ceil(image_width * Hi/Hmax) | |
| 218 * and similarly for height. For decompression, IDCT scaling is included, so | |
| 219 * downsampled_width = ceil(image_width * Hi/Hmax * DCT_scaled_size/DCTSIZE) | |
| 220 */ | |
| 221 JDIMENSION downsampled_width; /* actual width in samples */ | |
| 222 JDIMENSION downsampled_height; /* actual height in samples */ | |
| 223 /* This flag is used only for decompression. In cases where some of the | |
| 224 * components will be ignored (eg grayscale output from YCbCr image), | |
| 225 * we can skip most computations for the unused components. | |
| 226 */ | |
| 227 boolean component_needed; /* do we need the value of this component? */ | |
| 228 | |
| 229 /* These values are computed before starting a scan of the component. */ | |
| 230 /* The decompressor output side may not use these variables. */ | |
| 231 int MCU_width; /* number of blocks per MCU, horizontally */ | |
| 232 int MCU_height; /* number of blocks per MCU, vertically */ | |
| 233 int MCU_blocks; /* MCU_width * MCU_height */ | |
| 234 int MCU_sample_width; /* MCU width in samples, MCU_width*DCT_scaled_si
ze */ | |
| 235 int last_col_width; /* # of non-dummy blocks across in last MCU */ | |
| 236 int last_row_height; /* # of non-dummy blocks down in last MCU */ | |
| 237 | |
| 238 /* Saved quantization table for component; NULL if none yet saved. | |
| 239 * See jdinput.c comments about the need for this information. | |
| 240 * This field is currently used only for decompression. | |
| 241 */ | |
| 242 JQUANT_TBL * quant_table; | |
| 243 | |
| 244 /* Private per-component storage for DCT or IDCT subsystem. */ | |
| 245 void * dct_table; | |
| 246 } jpeg_component_info; | |
| 247 | |
| 248 | |
| 249 /* The script for encoding a multiple-scan file is an array of these: */ | |
| 250 | |
| 251 typedef struct { | |
| 252 int comps_in_scan; /* number of components encoded in this scan */ | |
| 253 int component_index[MAX_COMPS_IN_SCAN]; /* their SOF/comp_info[] indexes */ | |
| 254 int Ss, Se; /* progressive JPEG spectral selection parms */ | |
| 255 int Ah, Al; /* progressive JPEG successive approx. parms */ | |
| 256 } jpeg_scan_info; | |
| 257 | |
| 258 /* The decompressor can save APPn and COM markers in a list of these: */ | |
| 259 | |
| 260 typedef struct jpeg_marker_struct * jpeg_saved_marker_ptr; | |
| 261 | |
| 262 struct jpeg_marker_struct { | |
| 263 jpeg_saved_marker_ptr next; /* next in list, or NULL */ | |
| 264 UINT8 marker; /* marker code: JPEG_COM, or JPEG_APP0+n */ | |
| 265 unsigned int original_length; /* # bytes of data in the file */ | |
| 266 unsigned int data_length; /* # bytes of data saved at data[] */ | |
| 267 JOCTET * data; /* the data contained in the marker */ | |
| 268 /* the marker length word is not counted in data_length or original_length */ | |
| 269 }; | |
| 270 | |
| 271 /* Known color spaces. */ | |
| 272 | |
| 273 typedef enum { | |
| 274 JCS_UNKNOWN, /* error/unspecified */ | |
| 275 JCS_GRAYSCALE, /* monochrome */ | |
| 276 JCS_RGB, /* red/green/blue */ | |
| 277 JCS_YCbCr, /* Y/Cb/Cr (also known as YUV) */ | |
| 278 JCS_CMYK, /* C/M/Y/K */ | |
| 279 JCS_YCCK /* Y/Cb/Cr/K */ | |
| 280 } J_COLOR_SPACE; | |
| 281 | |
| 282 /* DCT/IDCT algorithm options. */ | |
| 283 | |
| 284 typedef enum { | |
| 285 JDCT_ISLOW, /* slow but accurate integer algorithm */ | |
| 286 JDCT_IFAST, /* faster, less accurate integer method */ | |
| 287 JDCT_FLOAT /* floating-point: accurate, fast on fast HW */ | |
| 288 } J_DCT_METHOD; | |
| 289 | |
| 290 #ifndef JDCT_DEFAULT /* may be overridden in jconfig.h */ | |
| 291 #define JDCT_DEFAULT JDCT_ISLOW | |
| 292 #endif | |
| 293 #ifndef JDCT_FASTEST /* may be overridden in jconfig.h */ | |
| 294 #define JDCT_FASTEST JDCT_IFAST | |
| 295 #endif | |
| 296 | |
| 297 /* Dithering options for decompression. */ | |
| 298 | |
| 299 typedef enum { | |
| 300 JDITHER_NONE, /* no dithering */ | |
| 301 JDITHER_ORDERED, /* simple ordered dither */ | |
| 302 JDITHER_FS /* Floyd-Steinberg error diffusion dither */ | |
| 303 } J_DITHER_MODE; | |
| 304 | |
| 305 | |
| 306 /* Common fields between JPEG compression and decompression master structs. */ | |
| 307 | |
| 308 #define jpeg_common_fields \ | |
| 309 struct jpeg_error_mgr * err; /* Error handler module */\ | |
| 310 struct jpeg_memory_mgr * mem; /* Memory manager module */\ | |
| 311 struct jpeg_progress_mgr * progress; /* Progress monitor, or NULL if none */\ | |
| 312 void * client_data; /* Available for use by application */\ | |
| 313 boolean is_decompressor; /* So common code can tell which is which */\ | |
| 314 int global_state /* For checking call sequence validity */ | |
| 315 | |
| 316 /* Routines that are to be used by both halves of the library are declared | |
| 317 * to receive a pointer to this structure. There are no actual instances of | |
| 318 * jpeg_common_struct, only of jpeg_compress_struct and jpeg_decompress_struct. | |
| 319 */ | |
| 320 struct jpeg_common_struct { | |
| 321 jpeg_common_fields; /* Fields common to both master struct types */ | |
| 322 /* Additional fields follow in an actual jpeg_compress_struct or | |
| 323 * jpeg_decompress_struct. All three structs must agree on these | |
| 324 * initial fields! (This would be a lot cleaner in C++.) | |
| 325 */ | |
| 326 }; | |
| 327 | |
| 328 typedef struct jpeg_common_struct * j_common_ptr; | |
| 329 typedef struct jpeg_compress_struct * j_compress_ptr; | |
| 330 typedef struct jpeg_decompress_struct * j_decompress_ptr; | |
| 331 | |
| 332 | |
| 333 /* Master record for a compression instance */ | |
| 334 | |
| 335 struct jpeg_compress_struct { | |
| 336 jpeg_common_fields; /* Fields shared with jpeg_decompress_struct */ | |
| 337 | |
| 338 /* Destination for compressed data */ | |
| 339 struct jpeg_destination_mgr * dest; | |
| 340 | |
| 341 /* Description of source image --- these fields must be filled in by | |
| 342 * outer application before starting compression. in_color_space must | |
| 343 * be correct before you can even call jpeg_set_defaults(). | |
| 344 */ | |
| 345 | |
| 346 JDIMENSION image_width; /* input image width */ | |
| 347 JDIMENSION image_height; /* input image height */ | |
| 348 int input_components; /* # of color components in input image */ | |
| 349 J_COLOR_SPACE in_color_space; /* colorspace of input image */ | |
| 350 | |
| 351 double input_gamma; /* image gamma of input image */ | |
| 352 | |
| 353 /* Compression parameters --- these fields must be set before calling | |
| 354 * jpeg_start_compress(). We recommend calling jpeg_set_defaults() to | |
| 355 * initialize everything to reasonable defaults, then changing anything | |
| 356 * the application specifically wants to change. That way you won't get | |
| 357 * burnt when new parameters are added. Also note that there are several | |
| 358 * helper routines to simplify changing parameters. | |
| 359 */ | |
| 360 | |
| 361 int data_precision; /* bits of precision in image data */ | |
| 362 | |
| 363 int num_components; /* # of color components in JPEG image */ | |
| 364 J_COLOR_SPACE jpeg_color_space; /* colorspace of JPEG image */ | |
| 365 | |
| 366 jpeg_component_info * comp_info; | |
| 367 /* comp_info[i] describes component that appears i'th in SOF */ | |
| 368 | |
| 369 JQUANT_TBL * quant_tbl_ptrs[NUM_QUANT_TBLS]; | |
| 370 /* ptrs to coefficient quantization tables, or NULL if not defined */ | |
| 371 | |
| 372 JHUFF_TBL * dc_huff_tbl_ptrs[NUM_HUFF_TBLS]; | |
| 373 JHUFF_TBL * ac_huff_tbl_ptrs[NUM_HUFF_TBLS]; | |
| 374 /* ptrs to Huffman coding tables, or NULL if not defined */ | |
| 375 | |
| 376 UINT8 arith_dc_L[NUM_ARITH_TBLS]; /* L values for DC arith-coding tables */ | |
| 377 UINT8 arith_dc_U[NUM_ARITH_TBLS]; /* U values for DC arith-coding tables */ | |
| 378 UINT8 arith_ac_K[NUM_ARITH_TBLS]; /* Kx values for AC arith-coding tables */ | |
| 379 | |
| 380 int num_scans; /* # of entries in scan_info array */ | |
| 381 const jpeg_scan_info * scan_info; /* script for multi-scan file, or NULL */ | |
| 382 /* The default value of scan_info is NULL, which causes a single-scan | |
| 383 * sequential JPEG file to be emitted. To create a multi-scan file, | |
| 384 * set num_scans and scan_info to point to an array of scan definitions. | |
| 385 */ | |
| 386 | |
| 387 boolean raw_data_in; /* TRUE=caller supplies downsampled data */ | |
| 388 boolean arith_code; /* TRUE=arithmetic coding, FALSE=Huffman */ | |
| 389 boolean optimize_coding; /* TRUE=optimize entropy encoding parms */ | |
| 390 boolean CCIR601_sampling; /* TRUE=first samples are cosited */ | |
| 391 int smoothing_factor; /* 1..100, or 0 for no input smoothing */ | |
| 392 J_DCT_METHOD dct_method; /* DCT algorithm selector */ | |
| 393 | |
| 394 /* The restart interval can be specified in absolute MCUs by setting | |
| 395 * restart_interval, or in MCU rows by setting restart_in_rows | |
| 396 * (in which case the correct restart_interval will be figured | |
| 397 * for each scan). | |
| 398 */ | |
| 399 unsigned int restart_interval; /* MCUs per restart, or 0 for no restart */ | |
| 400 int restart_in_rows; /* if > 0, MCU rows per restart interval */ | |
| 401 | |
| 402 /* Parameters controlling emission of special markers. */ | |
| 403 | |
| 404 boolean write_JFIF_header; /* should a JFIF marker be written? */ | |
| 405 UINT8 JFIF_major_version; /* What to write for the JFIF version number */ | |
| 406 UINT8 JFIF_minor_version; | |
| 407 /* These three values are not used by the JPEG code, merely copied */ | |
| 408 /* into the JFIF APP0 marker. density_unit can be 0 for unknown, */ | |
| 409 /* 1 for dots/inch, or 2 for dots/cm. Note that the pixel aspect */ | |
| 410 /* ratio is defined by X_density/Y_density even when density_unit=0. */ | |
| 411 UINT8 density_unit; /* JFIF code for pixel size units */ | |
| 412 UINT16 X_density; /* Horizontal pixel density */ | |
| 413 UINT16 Y_density; /* Vertical pixel density */ | |
| 414 boolean write_Adobe_marker; /* should an Adobe marker be written? */ | |
| 415 | |
| 416 /* State variable: index of next scanline to be written to | |
| 417 * jpeg_write_scanlines(). Application may use this to control its | |
| 418 * processing loop, e.g., "while (next_scanline < image_height)". | |
| 419 */ | |
| 420 | |
| 421 JDIMENSION next_scanline; /* 0 .. image_height-1 */ | |
| 422 | |
| 423 /* Remaining fields are known throughout compressor, but generally | |
| 424 * should not be touched by a surrounding application. | |
| 425 */ | |
| 426 | |
| 427 /* | |
| 428 * These fields are computed during compression startup | |
| 429 */ | |
| 430 boolean progressive_mode; /* TRUE if scan script uses progressive mode */ | |
| 431 int max_h_samp_factor; /* largest h_samp_factor */ | |
| 432 int max_v_samp_factor; /* largest v_samp_factor */ | |
| 433 | |
| 434 JDIMENSION total_iMCU_rows; /* # of iMCU rows to be input to coef ctlr */ | |
| 435 /* The coefficient controller receives data in units of MCU rows as defined | |
| 436 * for fully interleaved scans (whether the JPEG file is interleaved or not). | |
| 437 * There are v_samp_factor * DCTSIZE sample rows of each component in an | |
| 438 * "iMCU" (interleaved MCU) row. | |
| 439 */ | |
| 440 | |
| 441 /* | |
| 442 * These fields are valid during any one scan. | |
| 443 * They describe the components and MCUs actually appearing in the scan. | |
| 444 */ | |
| 445 int comps_in_scan; /* # of JPEG components in this scan */ | |
| 446 jpeg_component_info * cur_comp_info[MAX_COMPS_IN_SCAN]; | |
| 447 /* *cur_comp_info[i] describes component that appears i'th in SOS */ | |
| 448 | |
| 449 JDIMENSION MCUs_per_row; /* # of MCUs across the image */ | |
| 450 JDIMENSION MCU_rows_in_scan; /* # of MCU rows in the image */ | |
| 451 | |
| 452 int blocks_in_MCU; /* # of DCT blocks per MCU */ | |
| 453 int MCU_membership[C_MAX_BLOCKS_IN_MCU]; | |
| 454 /* MCU_membership[i] is index in cur_comp_info of component owning */ | |
| 455 /* i'th block in an MCU */ | |
| 456 | |
| 457 int Ss, Se, Ah, Al; /* progressive JPEG parameters for scan */ | |
| 458 | |
| 459 /* | |
| 460 * Links to compression subobjects (methods and private variables of modules) | |
| 461 */ | |
| 462 struct jpeg_comp_master * master; | |
| 463 struct jpeg_c_main_controller * main; | |
| 464 struct jpeg_c_prep_controller * prep; | |
| 465 struct jpeg_c_coef_controller * coef; | |
| 466 struct jpeg_marker_writer * marker; | |
| 467 struct jpeg_color_converter * cconvert; | |
| 468 struct jpeg_downsampler * downsample; | |
| 469 struct jpeg_forward_dct * fdct; | |
| 470 struct jpeg_entropy_encoder * entropy; | |
| 471 jpeg_scan_info * script_space; /* workspace for jpeg_simple_progression */ | |
| 472 int script_space_size; | |
| 473 }; | |
| 474 | |
| 475 | |
| 476 /* Master record for a decompression instance */ | |
| 477 | |
| 478 struct jpeg_decompress_struct { | |
| 479 jpeg_common_fields; /* Fields shared with jpeg_compress_struct */ | |
| 480 | |
| 481 /* Source of compressed data */ | |
| 482 struct jpeg_source_mgr * src; | |
| 483 | |
| 484 /* Basic description of image --- filled in by jpeg_read_header(). */ | |
| 485 /* Application may inspect these values to decide how to process image. */ | |
| 486 | |
| 487 JDIMENSION image_width; /* nominal image width (from SOF marker) */ | |
| 488 JDIMENSION image_height; /* nominal image height */ | |
| 489 int num_components; /* # of color components in JPEG image */ | |
| 490 J_COLOR_SPACE jpeg_color_space; /* colorspace of JPEG image */ | |
| 491 | |
| 492 /* Decompression processing parameters --- these fields must be set before | |
| 493 * calling jpeg_start_decompress(). Note that jpeg_read_header() initializes | |
| 494 * them to default values. | |
| 495 */ | |
| 496 | |
| 497 J_COLOR_SPACE out_color_space; /* colorspace for output */ | |
| 498 | |
| 499 unsigned int scale_num, scale_denom; /* fraction by which to scale image */ | |
| 500 | |
| 501 double output_gamma; /* image gamma wanted in output */ | |
| 502 | |
| 503 boolean buffered_image; /* TRUE=multiple output passes */ | |
| 504 boolean raw_data_out; /* TRUE=downsampled data wanted */ | |
| 505 | |
| 506 J_DCT_METHOD dct_method; /* IDCT algorithm selector */ | |
| 507 boolean do_fancy_upsampling; /* TRUE=apply fancy upsampling */ | |
| 508 boolean do_block_smoothing; /* TRUE=apply interblock smoothing */ | |
| 509 | |
| 510 boolean quantize_colors; /* TRUE=colormapped output wanted */ | |
| 511 /* the following are ignored if not quantize_colors: */ | |
| 512 J_DITHER_MODE dither_mode; /* type of color dithering to use */ | |
| 513 boolean two_pass_quantize; /* TRUE=use two-pass color quantization */ | |
| 514 int desired_number_of_colors; /* max # colors to use in created colormap */ | |
| 515 /* these are significant only in buffered-image mode: */ | |
| 516 boolean enable_1pass_quant; /* enable future use of 1-pass quantizer */ | |
| 517 boolean enable_external_quant;/* enable future use of external colormap */ | |
| 518 boolean enable_2pass_quant; /* enable future use of 2-pass quantizer */ | |
| 519 | |
| 520 /* Description of actual output image that will be returned to application. | |
| 521 * These fields are computed by jpeg_start_decompress(). | |
| 522 * You can also use jpeg_calc_output_dimensions() to determine these values | |
| 523 * in advance of calling jpeg_start_decompress(). | |
| 524 */ | |
| 525 | |
| 526 JDIMENSION output_width; /* scaled image width */ | |
| 527 JDIMENSION output_height; /* scaled image height */ | |
| 528 int out_color_components; /* # of color components in out_color_space */ | |
| 529 int output_components; /* # of color components returned */ | |
| 530 /* output_components is 1 (a colormap index) when quantizing colors; | |
| 531 * otherwise it equals out_color_components. | |
| 532 */ | |
| 533 int rec_outbuf_height; /* min recommended height of scanline buffer */ | |
| 534 /* If the buffer passed to jpeg_read_scanlines() is less than this many rows | |
| 535 * high, space and time will be wasted due to unnecessary data copying. | |
| 536 * Usually rec_outbuf_height will be 1 or 2, at most 4. | |
| 537 */ | |
| 538 | |
| 539 /* When quantizing colors, the output colormap is described by these fields. | |
| 540 * The application can supply a colormap by setting colormap non-NULL before | |
| 541 * calling jpeg_start_decompress; otherwise a colormap is created during | |
| 542 * jpeg_start_decompress or jpeg_start_output. | |
| 543 * The map has out_color_components rows and actual_number_of_colors columns. | |
| 544 */ | |
| 545 int actual_number_of_colors; /* number of entries in use */ | |
| 546 JSAMPARRAY colormap; /* The color map as a 2-D pixel array */ | |
| 547 | |
| 548 /* State variables: these variables indicate the progress of decompression. | |
| 549 * The application may examine these but must not modify them. | |
| 550 */ | |
| 551 | |
| 552 /* Row index of next scanline to be read from jpeg_read_scanlines(). | |
| 553 * Application may use this to control its processing loop, e.g., | |
| 554 * "while (output_scanline < output_height)". | |
| 555 */ | |
| 556 JDIMENSION output_scanline; /* 0 .. output_height-1 */ | |
| 557 | |
| 558 /* Current input scan number and number of iMCU rows completed in scan. | |
| 559 * These indicate the progress of the decompressor input side. | |
| 560 */ | |
| 561 int input_scan_number; /* Number of SOS markers seen so far */ | |
| 562 JDIMENSION input_iMCU_row; /* Number of iMCU rows completed */ | |
| 563 | |
| 564 /* The "output scan number" is the notional scan being displayed by the | |
| 565 * output side. The decompressor will not allow output scan/row number | |
| 566 * to get ahead of input scan/row, but it can fall arbitrarily far behind. | |
| 567 */ | |
| 568 int output_scan_number; /* Nominal scan number being displayed */ | |
| 569 JDIMENSION output_iMCU_row; /* Number of iMCU rows read */ | |
| 570 | |
| 571 /* Current progression status. coef_bits[c][i] indicates the precision | |
| 572 * with which component c's DCT coefficient i (in zigzag order) is known. | |
| 573 * It is -1 when no data has yet been received, otherwise it is the point | |
| 574 * transform (shift) value for the most recent scan of the coefficient | |
| 575 * (thus, 0 at completion of the progression). | |
| 576 * This pointer is NULL when reading a non-progressive file. | |
| 577 */ | |
| 578 int (*coef_bits)[DCTSIZE2]; /* -1 or current Al value for each coef */ | |
| 579 | |
| 580 /* Internal JPEG parameters --- the application usually need not look at | |
| 581 * these fields. Note that the decompressor output side may not use | |
| 582 * any parameters that can change between scans. | |
| 583 */ | |
| 584 | |
| 585 /* Quantization and Huffman tables are carried forward across input | |
| 586 * datastreams when processing abbreviated JPEG datastreams. | |
| 587 */ | |
| 588 | |
| 589 JQUANT_TBL * quant_tbl_ptrs[NUM_QUANT_TBLS]; | |
| 590 /* ptrs to coefficient quantization tables, or NULL if not defined */ | |
| 591 | |
| 592 JHUFF_TBL * dc_huff_tbl_ptrs[NUM_HUFF_TBLS]; | |
| 593 JHUFF_TBL * ac_huff_tbl_ptrs[NUM_HUFF_TBLS]; | |
| 594 /* ptrs to Huffman coding tables, or NULL if not defined */ | |
| 595 | |
| 596 /* These parameters are never carried across datastreams, since they | |
| 597 * are given in SOF/SOS markers or defined to be reset by SOI. | |
| 598 */ | |
| 599 | |
| 600 int data_precision; /* bits of precision in image data */ | |
| 601 | |
| 602 jpeg_component_info * comp_info; | |
| 603 /* comp_info[i] describes component that appears i'th in SOF */ | |
| 604 | |
| 605 boolean progressive_mode; /* TRUE if SOFn specifies progressive mode */ | |
| 606 boolean arith_code; /* TRUE=arithmetic coding, FALSE=Huffman */ | |
| 607 | |
| 608 UINT8 arith_dc_L[NUM_ARITH_TBLS]; /* L values for DC arith-coding tables */ | |
| 609 UINT8 arith_dc_U[NUM_ARITH_TBLS]; /* U values for DC arith-coding tables */ | |
| 610 UINT8 arith_ac_K[NUM_ARITH_TBLS]; /* Kx values for AC arith-coding tables */ | |
| 611 | |
| 612 unsigned int restart_interval; /* MCUs per restart interval, or 0 for no resta
rt */ | |
| 613 | |
| 614 /* These fields record data obtained from optional markers recognized by | |
| 615 * the JPEG library. | |
| 616 */ | |
| 617 boolean saw_JFIF_marker; /* TRUE iff a JFIF APP0 marker was found */ | |
| 618 /* Data copied from JFIF marker; only valid if saw_JFIF_marker is TRUE: */ | |
| 619 UINT8 JFIF_major_version; /* JFIF version number */ | |
| 620 UINT8 JFIF_minor_version; | |
| 621 UINT8 density_unit; /* JFIF code for pixel size units */ | |
| 622 UINT16 X_density; /* Horizontal pixel density */ | |
| 623 UINT16 Y_density; /* Vertical pixel density */ | |
| 624 boolean saw_Adobe_marker; /* TRUE iff an Adobe APP14 marker was found */ | |
| 625 UINT8 Adobe_transform; /* Color transform code from Adobe marker */ | |
| 626 | |
| 627 boolean CCIR601_sampling; /* TRUE=first samples are cosited */ | |
| 628 | |
| 629 /* Aside from the specific data retained from APPn markers known to the | |
| 630 * library, the uninterpreted contents of any or all APPn and COM markers | |
| 631 * can be saved in a list for examination by the application. | |
| 632 */ | |
| 633 jpeg_saved_marker_ptr marker_list; /* Head of list of saved markers */ | |
| 634 | |
| 635 /* Remaining fields are known throughout decompressor, but generally | |
| 636 * should not be touched by a surrounding application. | |
| 637 */ | |
| 638 | |
| 639 /* | |
| 640 * These fields are computed during decompression startup | |
| 641 */ | |
| 642 int max_h_samp_factor; /* largest h_samp_factor */ | |
| 643 int max_v_samp_factor; /* largest v_samp_factor */ | |
| 644 | |
| 645 int min_DCT_scaled_size; /* smallest DCT_scaled_size of any component */ | |
| 646 | |
| 647 JDIMENSION total_iMCU_rows; /* # of iMCU rows in image */ | |
| 648 /* The coefficient controller's input and output progress is measured in | |
| 649 * units of "iMCU" (interleaved MCU) rows. These are the same as MCU rows | |
| 650 * in fully interleaved JPEG scans, but are used whether the scan is | |
| 651 * interleaved or not. We define an iMCU row as v_samp_factor DCT block | |
| 652 * rows of each component. Therefore, the IDCT output contains | |
| 653 * v_samp_factor*DCT_scaled_size sample rows of a component per iMCU row. | |
| 654 */ | |
| 655 | |
| 656 JSAMPLE * sample_range_limit; /* table for fast range-limiting */ | |
| 657 | |
| 658 /* | |
| 659 * These fields are valid during any one scan. | |
| 660 * They describe the components and MCUs actually appearing in the scan. | |
| 661 * Note that the decompressor output side must not use these fields. | |
| 662 */ | |
| 663 int comps_in_scan; /* # of JPEG components in this scan */ | |
| 664 jpeg_component_info * cur_comp_info[MAX_COMPS_IN_SCAN]; | |
| 665 /* *cur_comp_info[i] describes component that appears i'th in SOS */ | |
| 666 | |
| 667 JDIMENSION MCUs_per_row; /* # of MCUs across the image */ | |
| 668 JDIMENSION MCU_rows_in_scan; /* # of MCU rows in the image */ | |
| 669 | |
| 670 int blocks_in_MCU; /* # of DCT blocks per MCU */ | |
| 671 int MCU_membership[D_MAX_BLOCKS_IN_MCU]; | |
| 672 /* MCU_membership[i] is index in cur_comp_info of component owning */ | |
| 673 /* i'th block in an MCU */ | |
| 674 | |
| 675 int Ss, Se, Ah, Al; /* progressive JPEG parameters for scan */ | |
| 676 | |
| 677 /* This field is shared between entropy decoder and marker parser. | |
| 678 * It is either zero or the code of a JPEG marker that has been | |
| 679 * read from the data source, but has not yet been processed. | |
| 680 */ | |
| 681 int unread_marker; | |
| 682 | |
| 683 /* | |
| 684 * Links to decompression subobjects (methods, private variables of modules) | |
| 685 */ | |
| 686 struct jpeg_decomp_master * master; | |
| 687 struct jpeg_d_main_controller * main; | |
| 688 struct jpeg_d_coef_controller * coef; | |
| 689 struct jpeg_d_post_controller * post; | |
| 690 struct jpeg_input_controller * inputctl; | |
| 691 struct jpeg_marker_reader * marker; | |
| 692 struct jpeg_entropy_decoder * entropy; | |
| 693 struct jpeg_inverse_dct * idct; | |
| 694 struct jpeg_upsampler * upsample; | |
| 695 struct jpeg_color_deconverter * cconvert; | |
| 696 struct jpeg_color_quantizer * cquantize; | |
| 697 }; | |
| 698 | |
| 699 | |
| 700 /* "Object" declarations for JPEG modules that may be supplied or called | |
| 701 * directly by the surrounding application. | |
| 702 * As with all objects in the JPEG library, these structs only define the | |
| 703 * publicly visible methods and state variables of a module. Additional | |
| 704 * private fields may exist after the public ones. | |
| 705 */ | |
| 706 | |
| 707 | |
| 708 /* Error handler object */ | |
| 709 | |
| 710 struct jpeg_error_mgr { | |
| 711 /* Error exit handler: does not return to caller */ | |
| 712 JMETHOD(void, error_exit, (j_common_ptr cinfo)); | |
| 713 /* Conditionally emit a trace or warning message */ | |
| 714 JMETHOD(void, emit_message, (j_common_ptr cinfo, int msg_level)); | |
| 715 /* Routine that actually outputs a trace or error message */ | |
| 716 JMETHOD(void, output_message, (j_common_ptr cinfo)); | |
| 717 /* Format a message string for the most recent JPEG error or message */ | |
| 718 JMETHOD(void, format_message, (j_common_ptr cinfo, char * buffer)); | |
| 719 #define JMSG_LENGTH_MAX 200 /* recommended size of format_message buffer */ | |
| 720 /* Reset error state variables at start of a new image */ | |
| 721 JMETHOD(void, reset_error_mgr, (j_common_ptr cinfo)); | |
| 722 | |
| 723 /* The message ID code and any parameters are saved here. | |
| 724 * A message can have one string parameter or up to 8 int parameters. | |
| 725 */ | |
| 726 int msg_code; | |
| 727 #define JMSG_STR_PARM_MAX 80 | |
| 728 union { | |
| 729 int i[8]; | |
| 730 char s[JMSG_STR_PARM_MAX]; | |
| 731 } msg_parm; | |
| 732 | |
| 733 /* Standard state variables for error facility */ | |
| 734 | |
| 735 int trace_level; /* max msg_level that will be displayed */ | |
| 736 | |
| 737 /* For recoverable corrupt-data errors, we emit a warning message, | |
| 738 * but keep going unless emit_message chooses to abort. emit_message | |
| 739 * should count warnings in num_warnings. The surrounding application | |
| 740 * can check for bad data by seeing if num_warnings is nonzero at the | |
| 741 * end of processing. | |
| 742 */ | |
| 743 long num_warnings; /* number of corrupt-data warnings */ | |
| 744 | |
| 745 /* These fields point to the table(s) of error message strings. | |
| 746 * An application can change the table pointer to switch to a different | |
| 747 * message list (typically, to change the language in which errors are | |
| 748 * reported). Some applications may wish to add additional error codes | |
| 749 * that will be handled by the JPEG library error mechanism; the second | |
| 750 * table pointer is used for this purpose. | |
| 751 * | |
| 752 * First table includes all errors generated by JPEG library itself. | |
| 753 * Error code 0 is reserved for a "no such error string" message. | |
| 754 */ | |
| 755 const char * const * jpeg_message_table; /* Library errors */ | |
| 756 int last_jpeg_message; /* Table contains strings 0..last_jpeg_message */ | |
| 757 /* Second table can be added by application (see cjpeg/djpeg for example). | |
| 758 * It contains strings numbered first_addon_message..last_addon_message. | |
| 759 */ | |
| 760 const char * const * addon_message_table; /* Non-library errors */ | |
| 761 int first_addon_message; /* code for first string in addon table */ | |
| 762 int last_addon_message; /* code for last string in addon table */ | |
| 763 }; | |
| 764 | |
| 765 | |
| 766 /* Progress monitor object */ | |
| 767 | |
| 768 struct jpeg_progress_mgr { | |
| 769 JMETHOD(void, progress_monitor, (j_common_ptr cinfo)); | |
| 770 | |
| 771 long pass_counter; /* work units completed in this pass */ | |
| 772 long pass_limit; /* total number of work units in this pass */ | |
| 773 int completed_passes; /* passes completed so far */ | |
| 774 int total_passes; /* total number of passes expected */ | |
| 775 }; | |
| 776 | |
| 777 | |
| 778 /* Data destination object for compression */ | |
| 779 | |
| 780 struct jpeg_destination_mgr { | |
| 781 JOCTET * next_output_byte; /* => next byte to write in buffer */ | |
| 782 size_t free_in_buffer; /* # of byte spaces remaining in buffer */ | |
| 783 | |
| 784 JMETHOD(void, init_destination, (j_compress_ptr cinfo)); | |
| 785 JMETHOD(boolean, empty_output_buffer, (j_compress_ptr cinfo)); | |
| 786 JMETHOD(void, term_destination, (j_compress_ptr cinfo)); | |
| 787 }; | |
| 788 | |
| 789 | |
| 790 /* Data source object for decompression */ | |
| 791 | |
| 792 struct jpeg_source_mgr { | |
| 793 const JOCTET * next_input_byte; /* => next byte to read from buffer */ | |
| 794 size_t bytes_in_buffer; /* # of bytes remaining in buffer */ | |
| 795 | |
| 796 JMETHOD(void, init_source, (j_decompress_ptr cinfo)); | |
| 797 JMETHOD(boolean, fill_input_buffer, (j_decompress_ptr cinfo)); | |
| 798 JMETHOD(void, skip_input_data, (j_decompress_ptr cinfo, long num_bytes)); | |
| 799 JMETHOD(boolean, resync_to_restart, (j_decompress_ptr cinfo, int desired)); | |
| 800 JMETHOD(void, term_source, (j_decompress_ptr cinfo)); | |
| 801 }; | |
| 802 | |
| 803 | |
| 804 /* Memory manager object. | |
| 805 * Allocates "small" objects (a few K total), "large" objects (tens of K), | |
| 806 * and "really big" objects (virtual arrays with backing store if needed). | |
| 807 * The memory manager does not allow individual objects to be freed; rather, | |
| 808 * each created object is assigned to a pool, and whole pools can be freed | |
| 809 * at once. This is faster and more convenient than remembering exactly what | |
| 810 * to free, especially where malloc()/free() are not too speedy. | |
| 811 * NB: alloc routines never return NULL. They exit to error_exit if not | |
| 812 * successful. | |
| 813 */ | |
| 814 | |
| 815 #define JPOOL_PERMANENT 0 /* lasts until master record is destroyed */ | |
| 816 #define JPOOL_IMAGE 1 /* lasts until done with image/datastream */ | |
| 817 #define JPOOL_NUMPOOLS 2 | |
| 818 | |
| 819 typedef struct jvirt_sarray_control * jvirt_sarray_ptr; | |
| 820 typedef struct jvirt_barray_control * jvirt_barray_ptr; | |
| 821 | |
| 822 | |
| 823 struct jpeg_memory_mgr { | |
| 824 /* Method pointers */ | |
| 825 JMETHOD(void *, alloc_small, (j_common_ptr cinfo, int pool_id, | |
| 826 size_t sizeofobject)); | |
| 827 JMETHOD(void *, alloc_large, (j_common_ptr cinfo, int pool_id, | |
| 828 size_t sizeofobject)); | |
| 829 JMETHOD(JSAMPARRAY, alloc_sarray, (j_common_ptr cinfo, int pool_id, | |
| 830 JDIMENSION samplesperrow, | |
| 831 JDIMENSION numrows)); | |
| 832 JMETHOD(JBLOCKARRAY, alloc_barray, (j_common_ptr cinfo, int pool_id, | |
| 833 JDIMENSION blocksperrow, | |
| 834 JDIMENSION numrows)); | |
| 835 JMETHOD(jvirt_sarray_ptr, request_virt_sarray, (j_common_ptr cinfo, | |
| 836 int pool_id, | |
| 837 boolean pre_zero, | |
| 838 JDIMENSION samplesperrow, | |
| 839 JDIMENSION numrows, | |
| 840 JDIMENSION maxaccess)); | |
| 841 JMETHOD(jvirt_barray_ptr, request_virt_barray, (j_common_ptr cinfo, | |
| 842 int pool_id, | |
| 843 boolean pre_zero, | |
| 844 JDIMENSION blocksperrow, | |
| 845 JDIMENSION numrows, | |
| 846 JDIMENSION maxaccess)); | |
| 847 JMETHOD(void, realize_virt_arrays, (j_common_ptr cinfo)); | |
| 848 JMETHOD(JSAMPARRAY, access_virt_sarray, (j_common_ptr cinfo, | |
| 849 jvirt_sarray_ptr ptr, | |
| 850 JDIMENSION start_row, | |
| 851 JDIMENSION num_rows, | |
| 852 boolean writable)); | |
| 853 JMETHOD(JBLOCKARRAY, access_virt_barray, (j_common_ptr cinfo, | |
| 854 jvirt_barray_ptr ptr, | |
| 855 JDIMENSION start_row, | |
| 856 JDIMENSION num_rows, | |
| 857 boolean writable)); | |
| 858 JMETHOD(void, free_pool, (j_common_ptr cinfo, int pool_id)); | |
| 859 JMETHOD(void, self_destruct, (j_common_ptr cinfo)); | |
| 860 | |
| 861 /* Limit on memory allocation for this JPEG object. (Note that this is | |
| 862 * merely advisory, not a guaranteed maximum; it only affects the space | |
| 863 * used for virtual-array buffers.) May be changed by outer application | |
| 864 * after creating the JPEG object. | |
| 865 */ | |
| 866 long max_memory_to_use; | |
| 867 | |
| 868 /* Maximum allocation request accepted by alloc_large. */ | |
| 869 long max_alloc_chunk; | |
| 870 }; | |
| 871 | |
| 872 | |
| 873 /* Routine signature for application-supplied marker processing methods. | |
| 874 * Need not pass marker code since it is stored in cinfo->unread_marker. | |
| 875 */ | |
| 876 typedef JMETHOD(boolean, jpeg_marker_parser_method, (j_decompress_ptr cinfo)); | |
| 877 | |
| 878 | |
| 879 /* Declarations for routines called by application. | |
| 880 * The JPP macro hides prototype parameters from compilers that can't cope. | |
| 881 * Note JPP requires double parentheses. | |
| 882 */ | |
| 883 | |
| 884 #ifdef HAVE_PROTOTYPES | |
| 885 #define JPP(arglist) arglist | |
| 886 #else | |
| 887 #define JPP(arglist) () | |
| 888 #endif | |
| 889 | |
| 890 | |
| 891 /* Short forms of external names for systems with brain-damaged linkers. | |
| 892 * We shorten external names to be unique in the first six letters, which | |
| 893 * is good enough for all known systems. | |
| 894 * (If your compiler itself needs names to be unique in less than 15 | |
| 895 * characters, you are out of luck. Get a better compiler.) | |
| 896 */ | |
| 897 | |
| 898 #ifdef NEED_SHORT_EXTERNAL_NAMES | |
| 899 #define jpeg_std_error jStdError | |
| 900 #define jpeg_CreateCompress jCreaCompress | |
| 901 #define jpeg_CreateDecompress jCreaDecompress | |
| 902 #define jpeg_destroy_compress jDestCompress | |
| 903 #define jpeg_destroy_decompress jDestDecompress | |
| 904 #define jpeg_stdio_dest jStdDest | |
| 905 #define jpeg_stdio_src jStdSrc | |
| 906 #define jpeg_set_defaults jSetDefaults | |
| 907 #define jpeg_set_colorspace jSetColorspace | |
| 908 #define jpeg_default_colorspace jDefColorspace | |
| 909 #define jpeg_set_quality jSetQuality | |
| 910 #define jpeg_set_linear_quality jSetLQuality | |
| 911 #define jpeg_add_quant_table jAddQuantTable | |
| 912 #define jpeg_quality_scaling jQualityScaling | |
| 913 #define jpeg_simple_progression jSimProgress | |
| 914 #define jpeg_suppress_tables jSuppressTables | |
| 915 #define jpeg_alloc_quant_table jAlcQTable | |
| 916 #define jpeg_alloc_huff_table jAlcHTable | |
| 917 #define jpeg_start_compress jStrtCompress | |
| 918 #define jpeg_write_scanlines jWrtScanlines | |
| 919 #define jpeg_finish_compress jFinCompress | |
| 920 #define jpeg_write_raw_data jWrtRawData | |
| 921 #define jpeg_write_marker jWrtMarker | |
| 922 #define jpeg_write_m_header jWrtMHeader | |
| 923 #define jpeg_write_m_byte jWrtMByte | |
| 924 #define jpeg_write_tables jWrtTables | |
| 925 #define jpeg_read_header jReadHeader | |
| 926 #define jpeg_start_decompress jStrtDecompress | |
| 927 #define jpeg_read_scanlines jReadScanlines | |
| 928 #define jpeg_finish_decompress jFinDecompress | |
| 929 #define jpeg_read_raw_data jReadRawData | |
| 930 #define jpeg_has_multiple_scans jHasMultScn | |
| 931 #define jpeg_start_output jStrtOutput | |
| 932 #define jpeg_finish_output jFinOutput | |
| 933 #define jpeg_input_complete jInComplete | |
| 934 #define jpeg_new_colormap jNewCMap | |
| 935 #define jpeg_consume_input jConsumeInput | |
| 936 #define jpeg_calc_output_dimensions jCalcDimensions | |
| 937 #define jpeg_save_markers jSaveMarkers | |
| 938 #define jpeg_set_marker_processor jSetMarker | |
| 939 #define jpeg_read_coefficients jReadCoefs | |
| 940 #define jpeg_write_coefficients jWrtCoefs | |
| 941 #define jpeg_copy_critical_parameters jCopyCrit | |
| 942 #define jpeg_abort_compress jAbrtCompress | |
| 943 #define jpeg_abort_decompress jAbrtDecompress | |
| 944 #define jpeg_abort jAbort | |
| 945 #define jpeg_destroy jDestroy | |
| 946 #define jpeg_resync_to_restart jResyncRestart | |
| 947 #endif /* NEED_SHORT_EXTERNAL_NAMES */ | |
| 948 | |
| 949 | |
| 950 /* Default error-management setup */ | |
| 951 EXTERN(struct jpeg_error_mgr *) jpeg_std_error | |
| 952 JPP((struct jpeg_error_mgr * err)); | |
| 953 | |
| 954 /* Initialization of JPEG compression objects. | |
| 955 * jpeg_create_compress() and jpeg_create_decompress() are the exported | |
| 956 * names that applications should call. These expand to calls on | |
| 957 * jpeg_CreateCompress and jpeg_CreateDecompress with additional information | |
| 958 * passed for version mismatch checking. | |
| 959 * NB: you must set up the error-manager BEFORE calling jpeg_create_xxx. | |
| 960 */ | |
| 961 #define jpeg_create_compress(cinfo) \ | |
| 962 jpeg_CreateCompress((cinfo), JPEG_LIB_VERSION, \ | |
| 963 (size_t) sizeof(struct jpeg_compress_struct)) | |
| 964 #define jpeg_create_decompress(cinfo) \ | |
| 965 jpeg_CreateDecompress((cinfo), JPEG_LIB_VERSION, \ | |
| 966 (size_t) sizeof(struct jpeg_decompress_struct)) | |
| 967 EXTERN(void) jpeg_CreateCompress JPP((j_compress_ptr cinfo, | |
| 968 int version, size_t structsize)); | |
| 969 EXTERN(void) jpeg_CreateDecompress JPP((j_decompress_ptr cinfo, | |
| 970 int version, size_t structsize)); | |
| 971 /* Destruction of JPEG compression objects */ | |
| 972 EXTERN(void) jpeg_destroy_compress JPP((j_compress_ptr cinfo)); | |
| 973 EXTERN(void) jpeg_destroy_decompress JPP((j_decompress_ptr cinfo)); | |
| 974 | |
| 975 #if 0 | |
| 976 /* Standard data source and destination managers: stdio streams. */ | |
| 977 /* Caller is responsible for opening the file before and closing after. */ | |
| 978 EXTERN(void) jpeg_stdio_dest JPP((j_compress_ptr cinfo, FXSYS_FILE * outfile)); | |
| 979 EXTERN(void) jpeg_stdio_src JPP((j_decompress_ptr cinfo, FXSYS_FILE * infile)); | |
| 980 #endif | |
| 981 | |
| 982 /* Default parameter setup for compression */ | |
| 983 EXTERN(void) jpeg_set_defaults JPP((j_compress_ptr cinfo)); | |
| 984 /* Compression parameter setup aids */ | |
| 985 EXTERN(void) jpeg_set_colorspace JPP((j_compress_ptr cinfo, | |
| 986 J_COLOR_SPACE colorspace)); | |
| 987 EXTERN(void) jpeg_default_colorspace JPP((j_compress_ptr cinfo)); | |
| 988 EXTERN(void) jpeg_set_quality JPP((j_compress_ptr cinfo, int quality, | |
| 989 boolean force_baseline)); | |
| 990 EXTERN(void) jpeg_set_linear_quality JPP((j_compress_ptr cinfo, | |
| 991 int scale_factor, | |
| 992 boolean force_baseline)); | |
| 993 EXTERN(void) jpeg_add_quant_table JPP((j_compress_ptr cinfo, int which_tbl, | |
| 994 const unsigned int *basic_table, | |
| 995 int scale_factor, | |
| 996 boolean force_baseline)); | |
| 997 EXTERN(int) jpeg_quality_scaling JPP((int quality)); | |
| 998 EXTERN(void) jpeg_simple_progression JPP((j_compress_ptr cinfo)); | |
| 999 EXTERN(void) jpeg_suppress_tables JPP((j_compress_ptr cinfo, | |
| 1000 boolean suppress)); | |
| 1001 EXTERN(JQUANT_TBL *) jpeg_alloc_quant_table JPP((j_common_ptr cinfo)); | |
| 1002 EXTERN(JHUFF_TBL *) jpeg_alloc_huff_table JPP((j_common_ptr cinfo)); | |
| 1003 | |
| 1004 /* Main entry points for compression */ | |
| 1005 EXTERN(void) jpeg_start_compress JPP((j_compress_ptr cinfo, | |
| 1006 boolean write_all_tables)); | |
| 1007 EXTERN(JDIMENSION) jpeg_write_scanlines JPP((j_compress_ptr cinfo, | |
| 1008 JSAMPARRAY scanlines, | |
| 1009 JDIMENSION num_lines)); | |
| 1010 EXTERN(void) jpeg_finish_compress JPP((j_compress_ptr cinfo)); | |
| 1011 | |
| 1012 /* Replaces jpeg_write_scanlines when writing raw downsampled data. */ | |
| 1013 EXTERN(JDIMENSION) jpeg_write_raw_data JPP((j_compress_ptr cinfo, | |
| 1014 JSAMPIMAGE data, | |
| 1015 JDIMENSION num_lines)); | |
| 1016 | |
| 1017 /* Write a special marker. See libjpeg.doc concerning safe usage. */ | |
| 1018 EXTERN(void) jpeg_write_marker | |
| 1019 JPP((j_compress_ptr cinfo, int marker, | |
| 1020 const JOCTET * dataptr, unsigned int datalen)); | |
| 1021 /* Same, but piecemeal. */ | |
| 1022 EXTERN(void) jpeg_write_m_header | |
| 1023 JPP((j_compress_ptr cinfo, int marker, unsigned int datalen)); | |
| 1024 EXTERN(void) jpeg_write_m_byte | |
| 1025 JPP((j_compress_ptr cinfo, int val)); | |
| 1026 | |
| 1027 /* Alternate compression function: just write an abbreviated table file */ | |
| 1028 EXTERN(void) jpeg_write_tables JPP((j_compress_ptr cinfo)); | |
| 1029 | |
| 1030 /* Decompression startup: read start of JPEG datastream to see what's there */ | |
| 1031 EXTERN(int) jpeg_read_header JPP((j_decompress_ptr cinfo, | |
| 1032 boolean require_image)); | |
| 1033 /* Return value is one of: */ | |
| 1034 #define JPEG_SUSPENDED 0 /* Suspended due to lack of input data */ | |
| 1035 #define JPEG_HEADER_OK 1 /* Found valid image datastream */ | |
| 1036 #define JPEG_HEADER_TABLES_ONLY 2 /* Found valid table-specs-only datastream */ | |
| 1037 /* If you pass require_image = TRUE (normal case), you need not check for | |
| 1038 * a TABLES_ONLY return code; an abbreviated file will cause an error exit. | |
| 1039 * JPEG_SUSPENDED is only possible if you use a data source module that can | |
| 1040 * give a suspension return (the stdio source module doesn't). | |
| 1041 */ | |
| 1042 | |
| 1043 /* Main entry points for decompression */ | |
| 1044 EXTERN(boolean) jpeg_start_decompress JPP((j_decompress_ptr cinfo)); | |
| 1045 EXTERN(JDIMENSION) jpeg_read_scanlines JPP((j_decompress_ptr cinfo, | |
| 1046 JSAMPARRAY scanlines, | |
| 1047 JDIMENSION max_lines)); | |
| 1048 EXTERN(boolean) jpeg_finish_decompress JPP((j_decompress_ptr cinfo)); | |
| 1049 | |
| 1050 /* Replaces jpeg_read_scanlines when reading raw downsampled data. */ | |
| 1051 EXTERN(JDIMENSION) jpeg_read_raw_data JPP((j_decompress_ptr cinfo, | |
| 1052 JSAMPIMAGE data, | |
| 1053 JDIMENSION max_lines)); | |
| 1054 | |
| 1055 /* Additional entry points for buffered-image mode. */ | |
| 1056 EXTERN(boolean) jpeg_has_multiple_scans JPP((j_decompress_ptr cinfo)); | |
| 1057 EXTERN(boolean) jpeg_start_output JPP((j_decompress_ptr cinfo, | |
| 1058 int scan_number)); | |
| 1059 EXTERN(boolean) jpeg_finish_output JPP((j_decompress_ptr cinfo)); | |
| 1060 EXTERN(boolean) jpeg_input_complete JPP((j_decompress_ptr cinfo)); | |
| 1061 EXTERN(void) jpeg_new_colormap JPP((j_decompress_ptr cinfo)); | |
| 1062 EXTERN(int) jpeg_consume_input JPP((j_decompress_ptr cinfo)); | |
| 1063 /* Return value is one of: */ | |
| 1064 /* #define JPEG_SUSPENDED 0 Suspended due to lack of input data */ | |
| 1065 #define JPEG_REACHED_SOS 1 /* Reached start of new scan */ | |
| 1066 #define JPEG_REACHED_EOI 2 /* Reached end of image */ | |
| 1067 #define JPEG_ROW_COMPLETED 3 /* Completed one iMCU row */ | |
| 1068 #define JPEG_SCAN_COMPLETED 4 /* Completed last iMCU row of a scan */ | |
| 1069 | |
| 1070 /* Precalculate output dimensions for current decompression parameters. */ | |
| 1071 EXTERN(void) jpeg_calc_output_dimensions JPP((j_decompress_ptr cinfo)); | |
| 1072 | |
| 1073 /* Control saving of COM and APPn markers into marker_list. */ | |
| 1074 EXTERN(void) jpeg_save_markers | |
| 1075 JPP((j_decompress_ptr cinfo, int marker_code, | |
| 1076 unsigned int length_limit)); | |
| 1077 | |
| 1078 /* Install a special processing method for COM or APPn markers. */ | |
| 1079 EXTERN(void) jpeg_set_marker_processor | |
| 1080 JPP((j_decompress_ptr cinfo, int marker_code, | |
| 1081 jpeg_marker_parser_method routine)); | |
| 1082 | |
| 1083 /* Read or write raw DCT coefficients --- useful for lossless transcoding. */ | |
| 1084 EXTERN(jvirt_barray_ptr *) jpeg_read_coefficients JPP((j_decompress_ptr cinfo)); | |
| 1085 EXTERN(void) jpeg_write_coefficients JPP((j_compress_ptr cinfo, | |
| 1086 jvirt_barray_ptr * coef_arrays)); | |
| 1087 EXTERN(void) jpeg_copy_critical_parameters JPP((j_decompress_ptr srcinfo, | |
| 1088 j_compress_ptr dstinfo)); | |
| 1089 | |
| 1090 /* If you choose to abort compression or decompression before completing | |
| 1091 * jpeg_finish_(de)compress, then you need to clean up to release memory, | |
| 1092 * temporary files, etc. You can just call jpeg_destroy_(de)compress | |
| 1093 * if you're done with the JPEG object, but if you want to clean it up and | |
| 1094 * reuse it, call this: | |
| 1095 */ | |
| 1096 EXTERN(void) jpeg_abort_compress JPP((j_compress_ptr cinfo)); | |
| 1097 EXTERN(void) jpeg_abort_decompress JPP((j_decompress_ptr cinfo)); | |
| 1098 | |
| 1099 /* Generic versions of jpeg_abort and jpeg_destroy that work on either | |
| 1100 * flavor of JPEG object. These may be more convenient in some places. | |
| 1101 */ | |
| 1102 EXTERN(void) jpeg_abort JPP((j_common_ptr cinfo)); | |
| 1103 EXTERN(void) jpeg_destroy JPP((j_common_ptr cinfo)); | |
| 1104 | |
| 1105 /* Default restart-marker-resync procedure for use by data source modules */ | |
| 1106 EXTERN(boolean) jpeg_resync_to_restart JPP((j_decompress_ptr cinfo, | |
| 1107 int desired)); | |
| 1108 | |
| 1109 | |
| 1110 /* These marker codes are exported since applications and data source modules | |
| 1111 * are likely to want to use them. | |
| 1112 */ | |
| 1113 | |
| 1114 #define JPEG_RST0 0xD0 /* RST0 marker code */ | |
| 1115 #define JPEG_EOI 0xD9 /* EOI marker code */ | |
| 1116 #define JPEG_APP0 0xE0 /* APP0 marker code */ | |
| 1117 #define JPEG_COM 0xFE /* COM marker code */ | |
| 1118 | |
| 1119 | |
| 1120 /* If we have a brain-damaged compiler that emits warnings (or worse, errors) | |
| 1121 * for structure definitions that are never filled in, keep it quiet by | |
| 1122 * supplying dummy definitions for the various substructures. | |
| 1123 */ | |
| 1124 | |
| 1125 #ifdef INCOMPLETE_TYPES_BROKEN | |
| 1126 #ifndef JPEG_INTERNALS /* will be defined in jpegint.h */ | |
| 1127 struct jvirt_sarray_control { long dummy; }; | |
| 1128 struct jvirt_barray_control { long dummy; }; | |
| 1129 struct jpeg_comp_master { long dummy; }; | |
| 1130 struct jpeg_c_main_controller { long dummy; }; | |
| 1131 struct jpeg_c_prep_controller { long dummy; }; | |
| 1132 struct jpeg_c_coef_controller { long dummy; }; | |
| 1133 struct jpeg_marker_writer { long dummy; }; | |
| 1134 struct jpeg_color_converter { long dummy; }; | |
| 1135 struct jpeg_downsampler { long dummy; }; | |
| 1136 struct jpeg_forward_dct { long dummy; }; | |
| 1137 struct jpeg_entropy_encoder { long dummy; }; | |
| 1138 struct jpeg_decomp_master { long dummy; }; | |
| 1139 struct jpeg_d_main_controller { long dummy; }; | |
| 1140 struct jpeg_d_coef_controller { long dummy; }; | |
| 1141 struct jpeg_d_post_controller { long dummy; }; | |
| 1142 struct jpeg_input_controller { long dummy; }; | |
| 1143 struct jpeg_marker_reader { long dummy; }; | |
| 1144 struct jpeg_entropy_decoder { long dummy; }; | |
| 1145 struct jpeg_inverse_dct { long dummy; }; | |
| 1146 struct jpeg_upsampler { long dummy; }; | |
| 1147 struct jpeg_color_deconverter { long dummy; }; | |
| 1148 struct jpeg_color_quantizer { long dummy; }; | |
| 1149 #endif /* JPEG_INTERNALS */ | |
| 1150 #endif /* INCOMPLETE_TYPES_BROKEN */ | |
| 1151 | |
| 1152 | |
| 1153 /* | |
| 1154 * The JPEG library modules define JPEG_INTERNALS before including this file. | |
| 1155 * The internal structure declarations are read only when that is true. | |
| 1156 * Applications using the library should not include jpegint.h, but may wish | |
| 1157 * to include jerror.h. | |
| 1158 */ | |
| 1159 | |
| 1160 #ifdef JPEG_INTERNALS | |
| 1161 #include "jpegint.h" /* fetch private declarations */ | |
| 1162 #include "jerror.h" /* fetch error codes too */ | |
| 1163 #endif | |
| 1164 | |
| 1165 #endif /* JPEGLIB_H */ | |
| OLD | NEW |
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Chromium Code Reviews
Issue 1417483004:
Remove duplicate core/include/thirdparties headers. (Closed)
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