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_c_coef_controller FOXIT_PREFIX(jinit_c_coef_controller) 24#define jinit_c_main_controller FOXIT_PREFIX(jinit_c_main_controller) 25#define jinit_c_master_control FOXIT_PREFIX(jinit_c_master_control) 26#define jinit_c_prep_controller FOXIT_PREFIX(jinit_c_prep_controller) 27#define jinit_color_converter FOXIT_PREFIX(jinit_color_converter) 28#define jinit_color_deconverter FOXIT_PREFIX(jinit_color_deconverter) 29#define jinit_compress_master FOXIT_PREFIX(jinit_compress_master) 30#define jinit_d_coef_controller FOXIT_PREFIX(jinit_d_coef_controller) 31#define jinit_d_main_controller FOXIT_PREFIX(jinit_d_main_controller) 32#define jinit_d_post_controller FOXIT_PREFIX(jinit_d_post_controller) 33#define jinit_downsampler FOXIT_PREFIX(jinit_downsampler) 34#define jinit_forward_dct FOXIT_PREFIX(jinit_forward_dct) 35#define jinit_huff_decoder FOXIT_PREFIX(jinit_huff_decoder) 36#define jinit_huff_encoder FOXIT_PREFIX(jinit_huff_encoder) 37#define jinit_input_controller FOXIT_PREFIX(jinit_input_controller) 38#define jinit_inverse_dct FOXIT_PREFIX(jinit_inverse_dct) 39#define jinit_marker_reader FOXIT_PREFIX(jinit_marker_reader) 40#define jinit_marker_writer FOXIT_PREFIX(jinit_marker_writer) 41#define jinit_master_decompress FOXIT_PREFIX(jinit_master_decompress) 42#define jinit_memory_mgr FOXIT_PREFIX(jinit_memory_mgr) 43#define jinit_merged_upsampler FOXIT_PREFIX(jinit_merged_upsampler) 44#define jinit_phuff_decoder FOXIT_PREFIX(jinit_phuff_decoder) 45#define jinit_phuff_encoder FOXIT_PREFIX(jinit_phuff_encoder) 46#define jinit_upsampler FOXIT_PREFIX(jinit_upsampler) 47#define jpeg_CreateCompress FOXIT_PREFIX(jpeg_CreateCompress) 48#define jpeg_CreateDecompress FOXIT_PREFIX(jpeg_CreateDecompress) 49#define jpeg_abort FOXIT_PREFIX(jpeg_abort) 50#define jpeg_abort_compress FOXIT_PREFIX(jpeg_abort_compress) 51#define jpeg_abort_decompress FOXIT_PREFIX(jpeg_abort_decompress) 52#define jpeg_add_quant_table FOXIT_PREFIX(jpeg_add_quant_table) 53#define jpeg_alloc_huff_table FOXIT_PREFIX(jpeg_alloc_huff_table) 54#define jpeg_alloc_quant_table FOXIT_PREFIX(jpeg_alloc_quant_table) 55#define jpeg_calc_output_dimensions FOXIT_PREFIX(jpeg_calc_output_dimensions) 56#define jpeg_consume_input FOXIT_PREFIX(jpeg_consume_input) 57#define jpeg_default_colorspace FOXIT_PREFIX(jpeg_default_colorspace) 58#define jpeg_destroy FOXIT_PREFIX(jpeg_destroy) 59#define jpeg_destroy_compress FOXIT_PREFIX(jpeg_destroy_compress) 60#define jpeg_destroy_decompress FOXIT_PREFIX(jpeg_destroy_decompress) 61#define jpeg_fdct_ifast FOXIT_PREFIX(jpeg_fdct_ifast) 62#define jpeg_fdct_islow FOXIT_PREFIX(jpeg_fdct_islow) 63#define jpeg_fill_bit_buffer FOXIT_PREFIX(jpeg_fill_bit_buffer) 64#define jpeg_finish_compress FOXIT_PREFIX(jpeg_finish_compress) 65#define jpeg_finish_decompress FOXIT_PREFIX(jpeg_finish_decompress) 66#define jpeg_finish_output FOXIT_PREFIX(jpeg_finish_output) 67#define jpeg_free_large FOXIT_PREFIX(jpeg_free_large) 68#define jpeg_free_small FOXIT_PREFIX(jpeg_free_small) 69#define jpeg_gen_optimal_table FOXIT_PREFIX(jpeg_gen_optimal_table) 70#define jpeg_get_large FOXIT_PREFIX(jpeg_get_large) 71#define jpeg_get_small FOXIT_PREFIX(jpeg_get_small) 72#define jpeg_has_multiple_scans FOXIT_PREFIX(jpeg_has_multiple_scans) 73#define jpeg_huff_decode FOXIT_PREFIX(jpeg_huff_decode) 74#define jpeg_idct_1x1 FOXIT_PREFIX(jpeg_idct_1x1) 75#define jpeg_idct_2x2 FOXIT_PREFIX(jpeg_idct_2x2) 76#define jpeg_idct_4x4 FOXIT_PREFIX(jpeg_idct_4x4) 77#define jpeg_idct_float FOXIT_PREFIX(jpeg_idct_float) 78#define jpeg_idct_ifast FOXIT_PREFIX(jpeg_idct_ifast) 79#define jpeg_idct_islow FOXIT_PREFIX(jpeg_idct_islow) 80#define jpeg_input_complete FOXIT_PREFIX(jpeg_input_complete) 81#define jpeg_make_c_derived_tbl FOXIT_PREFIX(jpeg_make_c_derived_tbl) 82#define jpeg_make_d_derived_tbl FOXIT_PREFIX(jpeg_make_d_derived_tbl) 83#define jpeg_mem_available FOXIT_PREFIX(jpeg_mem_available) 84#define jpeg_mem_init FOXIT_PREFIX(jpeg_mem_init) 85#define jpeg_mem_term FOXIT_PREFIX(jpeg_mem_term) 86#define jpeg_natural_order FOXIT_PREFIX(jpeg_natural_order) 87#define jpeg_new_colormap FOXIT_PREFIX(jpeg_new_colormap) 88#define jpeg_open_backing_store FOXIT_PREFIX(jpeg_open_backing_store) 89#define jpeg_quality_scaling FOXIT_PREFIX(jpeg_quality_scaling) 90#define jpeg_read_coefficients FOXIT_PREFIX(jpeg_read_coefficients) 91#define jpeg_read_header FOXIT_PREFIX(jpeg_read_header) 92#define jpeg_read_raw_data FOXIT_PREFIX(jpeg_read_raw_data) 93#define jpeg_read_scanlines FOXIT_PREFIX(jpeg_read_scanlines) 94#define jpeg_resync_to_restart FOXIT_PREFIX(jpeg_resync_to_restart) 95#define jpeg_save_markers FOXIT_PREFIX(jpeg_save_markers) 96#define jpeg_set_colorspace FOXIT_PREFIX(jpeg_set_colorspace) 97#define jpeg_set_defaults FOXIT_PREFIX(jpeg_set_defaults) 98#define jpeg_set_linear_quality FOXIT_PREFIX(jpeg_set_linear_quality) 99#define jpeg_set_marker_processor FOXIT_PREFIX(jpeg_set_marker_processor) 100#define jpeg_set_quality FOXIT_PREFIX(jpeg_set_quality) 101#define jpeg_simple_progression FOXIT_PREFIX(jpeg_simple_progression) 102#define jpeg_start_compress FOXIT_PREFIX(jpeg_start_compress) 103#define jpeg_start_decompress FOXIT_PREFIX(jpeg_start_decompress) 104#define jpeg_start_output FOXIT_PREFIX(jpeg_start_output) 105#define jpeg_std_error FOXIT_PREFIX(jpeg_std_error) 106#define jpeg_std_message_table FOXIT_PREFIX(jpeg_std_message_table) 107#define jpeg_stdio_src FOXIT_PREFIX(jpeg_stdio_src) 108#define jpeg_suppress_tables FOXIT_PREFIX(jpeg_suppress_tables) 109#define jpeg_write_m_byte FOXIT_PREFIX(jpeg_write_m_byte) 110#define jpeg_write_m_header FOXIT_PREFIX(jpeg_write_m_header) 111#define jpeg_write_marker FOXIT_PREFIX(jpeg_write_marker) 112#define jpeg_write_raw_data FOXIT_PREFIX(jpeg_write_raw_data) 113#define jpeg_write_scanlines FOXIT_PREFIX(jpeg_write_scanlines) 114#define jpeg_write_tables FOXIT_PREFIX(jpeg_write_tables) 115#define jround_up FOXIT_PREFIX(jround_up) 116#define jzero_far FOXIT_PREFIX(jzero_far) 117 118 /* 119 * First we include the configuration files that record how this 120 * installation of the JPEG library is set up. jconfig.h can be 121 * generated automatically for many systems. jmorecfg.h contains 122 * manual configuration options that most people need not worry about. 123 */ 124 125#ifndef JCONFIG_INCLUDED /* in case jinclude.h already did */ 126#include "jconfig.h" /* widely used configuration options */ 127#endif 128#include "jmorecfg.h" /* seldom changed options */ 129 130 131/* Version ID for the JPEG library. 132 * Might be useful for tests like "#if JPEG_LIB_VERSION >= 60". 133 */ 134 135#define JPEG_LIB_VERSION 62 /* Version 6b */ 136 137 138/* Various constants determining the sizes of things. 139 * All of these are specified by the JPEG standard, so don't change them 140 * if you want to be compatible. 141 */ 142 143#define DCTSIZE 8 /* The basic DCT block is 8x8 samples */ 144#define DCTSIZE2 64 /* DCTSIZE squared; # of elements in a block */ 145#define NUM_QUANT_TBLS 4 /* Quantization tables are numbered 0..3 */ 146#define NUM_HUFF_TBLS 4 /* Huffman tables are numbered 0..3 */ 147#define NUM_ARITH_TBLS 16 /* Arith-coding tables are numbered 0..15 */ 148#define MAX_COMPS_IN_SCAN 4 /* JPEG limit on # of components in one scan */ 149#define MAX_SAMP_FACTOR 4 /* JPEG limit on sampling factors */ 150/* Unfortunately, some bozo at Adobe saw no reason to be bound by the standard; 151 * the PostScript DCT filter can emit files with many more than 10 blocks/MCU. 152 * If you happen to run across such a file, you can up D_MAX_BLOCKS_IN_MCU 153 * to handle it. We even let you do this from the jconfig.h file. However, 154 * we strongly discourage changing C_MAX_BLOCKS_IN_MCU; just because Adobe 155 * sometimes emits noncompliant files doesn't mean you should too. 156 */ 157#define C_MAX_BLOCKS_IN_MCU 10 /* compressor's limit on blocks per MCU */ 158#ifndef D_MAX_BLOCKS_IN_MCU 159#define D_MAX_BLOCKS_IN_MCU 10 /* decompressor's limit on blocks per MCU */ 160#endif 161 162 163/* Data structures for images (arrays of samples and of DCT coefficients). 164 * On 80x86 machines, the image arrays are too big for near pointers, 165 * but the pointer arrays can fit in near memory. 166 */ 167 168typedef JSAMPLE *JSAMPROW; /* ptr to one image row of pixel samples. */ 169typedef JSAMPROW *JSAMPARRAY; /* ptr to some rows (a 2-D sample array) */ 170typedef JSAMPARRAY *JSAMPIMAGE; /* a 3-D sample array: top index is color */ 171 172typedef JCOEF JBLOCK[DCTSIZE2]; /* one block of coefficients */ 173typedef JBLOCK *JBLOCKROW; /* pointer to one row of coefficient blocks */ 174typedef JBLOCKROW *JBLOCKARRAY; /* a 2-D array of coefficient blocks */ 175typedef JBLOCKARRAY *JBLOCKIMAGE; /* a 3-D array of coefficient blocks */ 176 177typedef JCOEF *JCOEFPTR; /* useful in a couple of places */ 178 179 180/* Types for JPEG compression parameters and working tables. */ 181 182 183/* DCT coefficient quantization tables. */ 184 185typedef struct { 186 /* This array gives the coefficient quantizers in natural array order 187 * (not the zigzag order in which they are stored in a JPEG DQT marker). 188 * CAUTION: IJG versions prior to v6a kept this array in zigzag order. 189 */ 190 UINT16 quantval[DCTSIZE2]; /* quantization step for each coefficient */ 191 /* This field is used only during compression. It's initialized FALSE when 192 * the table is created, and set TRUE when it's been output to the file. 193 * You could suppress output of a table by setting this to TRUE. 194 * (See jpeg_suppress_tables for an example.) 195 */ 196 boolean sent_table; /* TRUE when table has been output */ 197} JQUANT_TBL; 198 199 200/* Huffman coding tables. */ 201 202typedef struct { 203 /* These two fields directly represent the contents of a JPEG DHT marker */ 204 UINT8 bits[17]; /* bits[k] = # of symbols with codes of */ 205 /* length k bits; bits[0] is unused */ 206 UINT8 huffval[256]; /* The symbols, in order of incr code length */ 207 /* This field is used only during compression. It's initialized FALSE when 208 * the table is created, and set TRUE when it's been output to the file. 209 * You could suppress output of a table by setting this to TRUE. 210 * (See jpeg_suppress_tables for an example.) 211 */ 212 boolean sent_table; /* TRUE when table has been output */ 213} JHUFF_TBL; 214 215 216/* Basic info about one component (color channel). */ 217 218typedef struct { 219 /* These values are fixed over the whole image. */ 220 /* For compression, they must be supplied by parameter setup; */ 221 /* for decompression, they are read from the SOF marker. */ 222 int component_id; /* identifier for this component (0..255) */ 223 int component_index; /* its index in SOF or cinfo->comp_info[] */ 224 int h_samp_factor; /* horizontal sampling factor (1..4) */ 225 int v_samp_factor; /* vertical sampling factor (1..4) */ 226 int quant_tbl_no; /* quantization table selector (0..3) */ 227 /* These values may vary between scans. */ 228 /* For compression, they must be supplied by parameter setup; */ 229 /* for decompression, they are read from the SOS marker. */ 230 /* The decompressor output side may not use these variables. */ 231 int dc_tbl_no; /* DC entropy table selector (0..3) */ 232 int ac_tbl_no; /* AC entropy table selector (0..3) */ 233 234 /* Remaining fields should be treated as private by applications. */ 235 236 /* These values are computed during compression or decompression startup: */ 237 /* Component's size in DCT blocks. 238 * Any dummy blocks added to complete an MCU are not counted; therefore 239 * these values do not depend on whether a scan is interleaved or not. 240 */ 241 JDIMENSION width_in_blocks; 242 JDIMENSION height_in_blocks; 243 /* Size of a DCT block in samples. Always DCTSIZE for compression. 244 * For decompression this is the size of the output from one DCT block, 245 * reflecting any scaling we choose to apply during the IDCT step. 246 * Values of 1,2,4,8 are likely to be supported. Note that different 247 * components may receive different IDCT scalings. 248 */ 249 int DCT_scaled_size; 250 /* The downsampled dimensions are the component's actual, unpadded number 251 * of samples at the main buffer (preprocessing/compression interface), thus 252 * downsampled_width = ceil(image_width * Hi/Hmax) 253 * and similarly for height. For decompression, IDCT scaling is included, so 254 * downsampled_width = ceil(image_width * Hi/Hmax * DCT_scaled_size/DCTSIZE) 255 */ 256 JDIMENSION downsampled_width; /* actual width in samples */ 257 JDIMENSION downsampled_height; /* actual height in samples */ 258 /* This flag is used only for decompression. In cases where some of the 259 * components will be ignored (eg grayscale output from YCbCr image), 260 * we can skip most computations for the unused components. 261 */ 262 boolean component_needed; /* do we need the value of this component? */ 263 264 /* These values are computed before starting a scan of the component. */ 265 /* The decompressor output side may not use these variables. */ 266 int MCU_width; /* number of blocks per MCU, horizontally */ 267 int MCU_height; /* number of blocks per MCU, vertically */ 268 int MCU_blocks; /* MCU_width * MCU_height */ 269 int MCU_sample_width; /* MCU width in samples, MCU_width*DCT_scaled_size */ 270 int last_col_width; /* # of non-dummy blocks across in last MCU */ 271 int last_row_height; /* # of non-dummy blocks down in last MCU */ 272 273 /* Saved quantization table for component; NULL if none yet saved. 274 * See jdinput.c comments about the need for this information. 275 * This field is currently used only for decompression. 276 */ 277 JQUANT_TBL * quant_table; 278 279 /* Private per-component storage for DCT or IDCT subsystem. */ 280 void * dct_table; 281} jpeg_component_info; 282 283 284/* The script for encoding a multiple-scan file is an array of these: */ 285 286typedef struct { 287 int comps_in_scan; /* number of components encoded in this scan */ 288 int component_index[MAX_COMPS_IN_SCAN]; /* their SOF/comp_info[] indexes */ 289 int Ss, Se; /* progressive JPEG spectral selection parms */ 290 int Ah, Al; /* progressive JPEG successive approx. parms */ 291} jpeg_scan_info; 292 293/* The decompressor can save APPn and COM markers in a list of these: */ 294 295typedef struct jpeg_marker_struct * jpeg_saved_marker_ptr; 296 297struct jpeg_marker_struct { 298 jpeg_saved_marker_ptr next; /* next in list, or NULL */ 299 UINT8 marker; /* marker code: JPEG_COM, or JPEG_APP0+n */ 300 unsigned int original_length; /* # bytes of data in the file */ 301 unsigned int data_length; /* # bytes of data saved at data[] */ 302 JOCTET * data; /* the data contained in the marker */ 303 /* the marker length word is not counted in data_length or original_length */ 304}; 305 306/* Known color spaces. */ 307 308typedef enum { 309 JCS_UNKNOWN, /* error/unspecified */ 310 JCS_GRAYSCALE, /* monochrome */ 311 JCS_RGB, /* red/green/blue */ 312 JCS_YCbCr, /* Y/Cb/Cr (also known as YUV) */ 313 JCS_CMYK, /* C/M/Y/K */ 314 JCS_YCCK /* Y/Cb/Cr/K */ 315} J_COLOR_SPACE; 316 317/* DCT/IDCT algorithm options. */ 318 319typedef enum { 320 JDCT_ISLOW, /* slow but accurate integer algorithm */ 321 JDCT_IFAST, /* faster, less accurate integer method */ 322 JDCT_FLOAT /* floating-point: accurate, fast on fast HW */ 323} J_DCT_METHOD; 324 325#ifndef JDCT_DEFAULT /* may be overridden in jconfig.h */ 326#define JDCT_DEFAULT JDCT_ISLOW 327#endif 328#ifndef JDCT_FASTEST /* may be overridden in jconfig.h */ 329#define JDCT_FASTEST JDCT_IFAST 330#endif 331 332/* Dithering options for decompression. */ 333 334typedef enum { 335 JDITHER_NONE, /* no dithering */ 336 JDITHER_ORDERED, /* simple ordered dither */ 337 JDITHER_FS /* Floyd-Steinberg error diffusion dither */ 338} J_DITHER_MODE; 339 340 341/* Common fields between JPEG compression and decompression master structs. */ 342 343#define jpeg_common_fields \ 344 struct jpeg_error_mgr * err; /* Error handler module */\ 345 struct jpeg_memory_mgr * mem; /* Memory manager module */\ 346 struct jpeg_progress_mgr * progress; /* Progress monitor, or NULL if none */\ 347 void * client_data; /* Available for use by application */\ 348 boolean is_decompressor; /* So common code can tell which is which */\ 349 int global_state /* For checking call sequence validity */ 350 351/* Routines that are to be used by both halves of the library are declared 352 * to receive a pointer to this structure. There are no actual instances of 353 * jpeg_common_struct, only of jpeg_compress_struct and jpeg_decompress_struct. 354 */ 355struct jpeg_common_struct { 356 jpeg_common_fields; /* Fields common to both master struct types */ 357 /* Additional fields follow in an actual jpeg_compress_struct or 358 * jpeg_decompress_struct. All three structs must agree on these 359 * initial fields! (This would be a lot cleaner in C++.) 360 */ 361}; 362 363typedef struct jpeg_common_struct * j_common_ptr; 364typedef struct jpeg_compress_struct * j_compress_ptr; 365typedef struct jpeg_decompress_struct * j_decompress_ptr; 366 367 368/* Master record for a compression instance */ 369 370struct jpeg_compress_struct { 371 jpeg_common_fields; /* Fields shared with jpeg_decompress_struct */ 372 373 /* Destination for compressed data */ 374 struct jpeg_destination_mgr * dest; 375 376 /* Description of source image --- these fields must be filled in by 377 * outer application before starting compression. in_color_space must 378 * be correct before you can even call jpeg_set_defaults(). 379 */ 380 381 JDIMENSION image_width; /* input image width */ 382 JDIMENSION image_height; /* input image height */ 383 int input_components; /* # of color components in input image */ 384 J_COLOR_SPACE in_color_space; /* colorspace of input image */ 385 386 double input_gamma; /* image gamma of input image */ 387 388 /* Compression parameters --- these fields must be set before calling 389 * jpeg_start_compress(). We recommend calling jpeg_set_defaults() to 390 * initialize everything to reasonable defaults, then changing anything 391 * the application specifically wants to change. That way you won't get 392 * burnt when new parameters are added. Also note that there are several 393 * helper routines to simplify changing parameters. 394 */ 395 396 int data_precision; /* bits of precision in image data */ 397 398 int num_components; /* # of color components in JPEG image */ 399 J_COLOR_SPACE jpeg_color_space; /* colorspace of JPEG image */ 400 401 jpeg_component_info * comp_info; 402 /* comp_info[i] describes component that appears i'th in SOF */ 403 404 JQUANT_TBL * quant_tbl_ptrs[NUM_QUANT_TBLS]; 405 /* ptrs to coefficient quantization tables, or NULL if not defined */ 406 407 JHUFF_TBL * dc_huff_tbl_ptrs[NUM_HUFF_TBLS]; 408 JHUFF_TBL * ac_huff_tbl_ptrs[NUM_HUFF_TBLS]; 409 /* ptrs to Huffman coding tables, or NULL if not defined */ 410 411 UINT8 arith_dc_L[NUM_ARITH_TBLS]; /* L values for DC arith-coding tables */ 412 UINT8 arith_dc_U[NUM_ARITH_TBLS]; /* U values for DC arith-coding tables */ 413 UINT8 arith_ac_K[NUM_ARITH_TBLS]; /* Kx values for AC arith-coding tables */ 414 415 int num_scans; /* # of entries in scan_info array */ 416 const jpeg_scan_info * scan_info; /* script for multi-scan file, or NULL */ 417 /* The default value of scan_info is NULL, which causes a single-scan 418 * sequential JPEG file to be emitted. To create a multi-scan file, 419 * set num_scans and scan_info to point to an array of scan definitions. 420 */ 421 422 boolean raw_data_in; /* TRUE=caller supplies downsampled data */ 423 boolean arith_code; /* TRUE=arithmetic coding, FALSE=Huffman */ 424 boolean optimize_coding; /* TRUE=optimize entropy encoding parms */ 425 boolean CCIR601_sampling; /* TRUE=first samples are cosited */ 426 int smoothing_factor; /* 1..100, or 0 for no input smoothing */ 427 J_DCT_METHOD dct_method; /* DCT algorithm selector */ 428 429 /* The restart interval can be specified in absolute MCUs by setting 430 * restart_interval, or in MCU rows by setting restart_in_rows 431 * (in which case the correct restart_interval will be figured 432 * for each scan). 433 */ 434 unsigned int restart_interval; /* MCUs per restart, or 0 for no restart */ 435 int restart_in_rows; /* if > 0, MCU rows per restart interval */ 436 437 /* Parameters controlling emission of special markers. */ 438 439 boolean write_JFIF_header; /* should a JFIF marker be written? */ 440 UINT8 JFIF_major_version; /* What to write for the JFIF version number */ 441 UINT8 JFIF_minor_version; 442 /* These three values are not used by the JPEG code, merely copied */ 443 /* into the JFIF APP0 marker. density_unit can be 0 for unknown, */ 444 /* 1 for dots/inch, or 2 for dots/cm. Note that the pixel aspect */ 445 /* ratio is defined by X_density/Y_density even when density_unit=0. */ 446 UINT8 density_unit; /* JFIF code for pixel size units */ 447 UINT16 X_density; /* Horizontal pixel density */ 448 UINT16 Y_density; /* Vertical pixel density */ 449 boolean write_Adobe_marker; /* should an Adobe marker be written? */ 450 451 /* State variable: index of next scanline to be written to 452 * jpeg_write_scanlines(). Application may use this to control its 453 * processing loop, e.g., "while (next_scanline < image_height)". 454 */ 455 456 JDIMENSION next_scanline; /* 0 .. image_height-1 */ 457 458 /* Remaining fields are known throughout compressor, but generally 459 * should not be touched by a surrounding application. 460 */ 461 462 /* 463 * These fields are computed during compression startup 464 */ 465 boolean progressive_mode; /* TRUE if scan script uses progressive mode */ 466 int max_h_samp_factor; /* largest h_samp_factor */ 467 int max_v_samp_factor; /* largest v_samp_factor */ 468 469 JDIMENSION total_iMCU_rows; /* # of iMCU rows to be input to coef ctlr */ 470 /* The coefficient controller receives data in units of MCU rows as defined 471 * for fully interleaved scans (whether the JPEG file is interleaved or not). 472 * There are v_samp_factor * DCTSIZE sample rows of each component in an 473 * "iMCU" (interleaved MCU) row. 474 */ 475 476 /* 477 * These fields are valid during any one scan. 478 * They describe the components and MCUs actually appearing in the scan. 479 */ 480 int comps_in_scan; /* # of JPEG components in this scan */ 481 jpeg_component_info * cur_comp_info[MAX_COMPS_IN_SCAN]; 482 /* *cur_comp_info[i] describes component that appears i'th in SOS */ 483 484 JDIMENSION MCUs_per_row; /* # of MCUs across the image */ 485 JDIMENSION MCU_rows_in_scan; /* # of MCU rows in the image */ 486 487 int blocks_in_MCU; /* # of DCT blocks per MCU */ 488 int MCU_membership[C_MAX_BLOCKS_IN_MCU]; 489 /* MCU_membership[i] is index in cur_comp_info of component owning */ 490 /* i'th block in an MCU */ 491 492 int Ss, Se, Ah, Al; /* progressive JPEG parameters for scan */ 493 494 /* 495 * Links to compression subobjects (methods and private variables of modules) 496 */ 497 struct jpeg_comp_master * master; 498 struct jpeg_c_main_controller * main; 499 struct jpeg_c_prep_controller * prep; 500 struct jpeg_c_coef_controller * coef; 501 struct jpeg_marker_writer * marker; 502 struct jpeg_color_converter * cconvert; 503 struct jpeg_downsampler * downsample; 504 struct jpeg_forward_dct * fdct; 505 struct jpeg_entropy_encoder * entropy; 506 jpeg_scan_info * script_space; /* workspace for jpeg_simple_progression */ 507 int script_space_size; 508}; 509 510 511/* Master record for a decompression instance */ 512 513struct jpeg_decompress_struct { 514 jpeg_common_fields; /* Fields shared with jpeg_compress_struct */ 515 516 /* Source of compressed data */ 517 struct jpeg_source_mgr * src; 518 519 /* Basic description of image --- filled in by jpeg_read_header(). */ 520 /* Application may inspect these values to decide how to process image. */ 521 522 JDIMENSION image_width; /* nominal image width (from SOF marker) */ 523 JDIMENSION image_height; /* nominal image height */ 524 int num_components; /* # of color components in JPEG image */ 525 J_COLOR_SPACE jpeg_color_space; /* colorspace of JPEG image */ 526 527 /* Decompression processing parameters --- these fields must be set before 528 * calling jpeg_start_decompress(). Note that jpeg_read_header() initializes 529 * them to default values. 530 */ 531 532 J_COLOR_SPACE out_color_space; /* colorspace for output */ 533 534 unsigned int scale_num, scale_denom; /* fraction by which to scale image */ 535 536 double output_gamma; /* image gamma wanted in output */ 537 538 boolean buffered_image; /* TRUE=multiple output passes */ 539 boolean raw_data_out; /* TRUE=downsampled data wanted */ 540 541 J_DCT_METHOD dct_method; /* IDCT algorithm selector */ 542 boolean do_fancy_upsampling; /* TRUE=apply fancy upsampling */ 543 boolean do_block_smoothing; /* TRUE=apply interblock smoothing */ 544 545 boolean quantize_colors; /* TRUE=colormapped output wanted */ 546 /* the following are ignored if not quantize_colors: */ 547 J_DITHER_MODE dither_mode; /* type of color dithering to use */ 548 boolean two_pass_quantize; /* TRUE=use two-pass color quantization */ 549 int desired_number_of_colors; /* max # colors to use in created colormap */ 550 /* these are significant only in buffered-image mode: */ 551 boolean enable_1pass_quant; /* enable future use of 1-pass quantizer */ 552 boolean enable_external_quant;/* enable future use of external colormap */ 553 boolean enable_2pass_quant; /* enable future use of 2-pass quantizer */ 554 555 /* Description of actual output image that will be returned to application. 556 * These fields are computed by jpeg_start_decompress(). 557 * You can also use jpeg_calc_output_dimensions() to determine these values 558 * in advance of calling jpeg_start_decompress(). 559 */ 560 561 JDIMENSION output_width; /* scaled image width */ 562 JDIMENSION output_height; /* scaled image height */ 563 int out_color_components; /* # of color components in out_color_space */ 564 int output_components; /* # of color components returned */ 565 /* output_components is 1 (a colormap index) when quantizing colors; 566 * otherwise it equals out_color_components. 567 */ 568 int rec_outbuf_height; /* min recommended height of scanline buffer */ 569 /* If the buffer passed to jpeg_read_scanlines() is less than this many rows 570 * high, space and time will be wasted due to unnecessary data copying. 571 * Usually rec_outbuf_height will be 1 or 2, at most 4. 572 */ 573 574 /* When quantizing colors, the output colormap is described by these fields. 575 * The application can supply a colormap by setting colormap non-NULL before 576 * calling jpeg_start_decompress; otherwise a colormap is created during 577 * jpeg_start_decompress or jpeg_start_output. 578 * The map has out_color_components rows and actual_number_of_colors columns. 579 */ 580 int actual_number_of_colors; /* number of entries in use */ 581 JSAMPARRAY colormap; /* The color map as a 2-D pixel array */ 582 583 /* State variables: these variables indicate the progress of decompression. 584 * The application may examine these but must not modify them. 585 */ 586 587 /* Row index of next scanline to be read from jpeg_read_scanlines(). 588 * Application may use this to control its processing loop, e.g., 589 * "while (output_scanline < output_height)". 590 */ 591 JDIMENSION output_scanline; /* 0 .. output_height-1 */ 592 593 /* Current input scan number and number of iMCU rows completed in scan. 594 * These indicate the progress of the decompressor input side. 595 */ 596 int input_scan_number; /* Number of SOS markers seen so far */ 597 JDIMENSION input_iMCU_row; /* Number of iMCU rows completed */ 598 599 /* The "output scan number" is the notional scan being displayed by the 600 * output side. The decompressor will not allow output scan/row number 601 * to get ahead of input scan/row, but it can fall arbitrarily far behind. 602 */ 603 int output_scan_number; /* Nominal scan number being displayed */ 604 JDIMENSION output_iMCU_row; /* Number of iMCU rows read */ 605 606 /* Current progression status. coef_bits[c][i] indicates the precision 607 * with which component c's DCT coefficient i (in zigzag order) is known. 608 * It is -1 when no data has yet been received, otherwise it is the point 609 * transform (shift) value for the most recent scan of the coefficient 610 * (thus, 0 at completion of the progression). 611 * This pointer is NULL when reading a non-progressive file. 612 */ 613 int (*coef_bits)[DCTSIZE2]; /* -1 or current Al value for each coef */ 614 615 /* Internal JPEG parameters --- the application usually need not look at 616 * these fields. Note that the decompressor output side may not use 617 * any parameters that can change between scans. 618 */ 619 620 /* Quantization and Huffman tables are carried forward across input 621 * datastreams when processing abbreviated JPEG datastreams. 622 */ 623 624 JQUANT_TBL * quant_tbl_ptrs[NUM_QUANT_TBLS]; 625 /* ptrs to coefficient quantization tables, or NULL if not defined */ 626 627 JHUFF_TBL * dc_huff_tbl_ptrs[NUM_HUFF_TBLS]; 628 JHUFF_TBL * ac_huff_tbl_ptrs[NUM_HUFF_TBLS]; 629 /* ptrs to Huffman coding tables, or NULL if not defined */ 630 631 /* These parameters are never carried across datastreams, since they 632 * are given in SOF/SOS markers or defined to be reset by SOI. 633 */ 634 635 int data_precision; /* bits of precision in image data */ 636 637 jpeg_component_info * comp_info; 638 /* comp_info[i] describes component that appears i'th in SOF */ 639 640 boolean progressive_mode; /* TRUE if SOFn specifies progressive mode */ 641 boolean arith_code; /* TRUE=arithmetic coding, FALSE=Huffman */ 642 643 UINT8 arith_dc_L[NUM_ARITH_TBLS]; /* L values for DC arith-coding tables */ 644 UINT8 arith_dc_U[NUM_ARITH_TBLS]; /* U values for DC arith-coding tables */ 645 UINT8 arith_ac_K[NUM_ARITH_TBLS]; /* Kx values for AC arith-coding tables */ 646 647 unsigned int restart_interval; /* MCUs per restart interval, or 0 for no restart */ 648 649 /* These fields record data obtained from optional markers recognized by 650 * the JPEG library. 651 */ 652 boolean saw_JFIF_marker; /* TRUE iff a JFIF APP0 marker was found */ 653 /* Data copied from JFIF marker; only valid if saw_JFIF_marker is TRUE: */ 654 UINT8 JFIF_major_version; /* JFIF version number */ 655 UINT8 JFIF_minor_version; 656 UINT8 density_unit; /* JFIF code for pixel size units */ 657 UINT16 X_density; /* Horizontal pixel density */ 658 UINT16 Y_density; /* Vertical pixel density */ 659 boolean saw_Adobe_marker; /* TRUE iff an Adobe APP14 marker was found */ 660 UINT8 Adobe_transform; /* Color transform code from Adobe marker */ 661 662 boolean CCIR601_sampling; /* TRUE=first samples are cosited */ 663 664 /* Aside from the specific data retained from APPn markers known to the 665 * library, the uninterpreted contents of any or all APPn and COM markers 666 * can be saved in a list for examination by the application. 667 */ 668 jpeg_saved_marker_ptr marker_list; /* Head of list of saved markers */ 669 670 /* Remaining fields are known throughout decompressor, but generally 671 * should not be touched by a surrounding application. 672 */ 673 674 /* 675 * These fields are computed during decompression startup 676 */ 677 int max_h_samp_factor; /* largest h_samp_factor */ 678 int max_v_samp_factor; /* largest v_samp_factor */ 679 680 int min_DCT_scaled_size; /* smallest DCT_scaled_size of any component */ 681 682 JDIMENSION total_iMCU_rows; /* # of iMCU rows in image */ 683 /* The coefficient controller's input and output progress is measured in 684 * units of "iMCU" (interleaved MCU) rows. These are the same as MCU rows 685 * in fully interleaved JPEG scans, but are used whether the scan is 686 * interleaved or not. We define an iMCU row as v_samp_factor DCT block 687 * rows of each component. Therefore, the IDCT output contains 688 * v_samp_factor*DCT_scaled_size sample rows of a component per iMCU row. 689 */ 690 691 JSAMPLE * sample_range_limit; /* table for fast range-limiting */ 692 693 /* 694 * These fields are valid during any one scan. 695 * They describe the components and MCUs actually appearing in the scan. 696 * Note that the decompressor output side must not use these fields. 697 */ 698 int comps_in_scan; /* # of JPEG components in this scan */ 699 jpeg_component_info * cur_comp_info[MAX_COMPS_IN_SCAN]; 700 /* *cur_comp_info[i] describes component that appears i'th in SOS */ 701 702 JDIMENSION MCUs_per_row; /* # of MCUs across the image */ 703 JDIMENSION MCU_rows_in_scan; /* # of MCU rows in the image */ 704 705 int blocks_in_MCU; /* # of DCT blocks per MCU */ 706 int MCU_membership[D_MAX_BLOCKS_IN_MCU]; 707 /* MCU_membership[i] is index in cur_comp_info of component owning */ 708 /* i'th block in an MCU */ 709 710 int Ss, Se, Ah, Al; /* progressive JPEG parameters for scan */ 711 712 /* This field is shared between entropy decoder and marker parser. 713 * It is either zero or the code of a JPEG marker that has been 714 * read from the data source, but has not yet been processed. 715 */ 716 int unread_marker; 717 718 /* 719 * Links to decompression subobjects (methods, private variables of modules) 720 */ 721 struct jpeg_decomp_master * master; 722 struct jpeg_d_main_controller * main; 723 struct jpeg_d_coef_controller * coef; 724 struct jpeg_d_post_controller * post; 725 struct jpeg_input_controller * inputctl; 726 struct jpeg_marker_reader * marker; 727 struct jpeg_entropy_decoder * entropy; 728 struct jpeg_inverse_dct * idct; 729 struct jpeg_upsampler * upsample; 730 struct jpeg_color_deconverter * cconvert; 731 struct jpeg_color_quantizer * cquantize; 732}; 733 734 735/* "Object" declarations for JPEG modules that may be supplied or called 736 * directly by the surrounding application. 737 * As with all objects in the JPEG library, these structs only define the 738 * publicly visible methods and state variables of a module. Additional 739 * private fields may exist after the public ones. 740 */ 741 742 743/* Error handler object */ 744 745struct jpeg_error_mgr { 746 /* Error exit handler: does not return to caller */ 747 JMETHOD(void, error_exit, (j_common_ptr cinfo)); 748 /* Conditionally emit a trace or warning message */ 749 JMETHOD(void, emit_message, (j_common_ptr cinfo, int msg_level)); 750 /* Routine that actually outputs a trace or error message */ 751 JMETHOD(void, output_message, (j_common_ptr cinfo)); 752 /* Format a message string for the most recent JPEG error or message */ 753 JMETHOD(void, format_message, (j_common_ptr cinfo, char * buffer)); 754#define JMSG_LENGTH_MAX 200 /* recommended size of format_message buffer */ 755 /* Reset error state variables at start of a new image */ 756 JMETHOD(void, reset_error_mgr, (j_common_ptr cinfo)); 757 758 /* The message ID code and any parameters are saved here. 759 * A message can have one string parameter or up to 8 int parameters. 760 */ 761 int msg_code; 762#define JMSG_STR_PARM_MAX 80 763 union { 764 int i[8]; 765 char s[JMSG_STR_PARM_MAX]; 766 } msg_parm; 767 768 /* Standard state variables for error facility */ 769 770 int trace_level; /* max msg_level that will be displayed */ 771 772 /* For recoverable corrupt-data errors, we emit a warning message, 773 * but keep going unless emit_message chooses to abort. emit_message 774 * should count warnings in num_warnings. The surrounding application 775 * can check for bad data by seeing if num_warnings is nonzero at the 776 * end of processing. 777 */ 778 long num_warnings; /* number of corrupt-data warnings */ 779 780 /* These fields point to the table(s) of error message strings. 781 * An application can change the table pointer to switch to a different 782 * message list (typically, to change the language in which errors are 783 * reported). Some applications may wish to add additional error codes 784 * that will be handled by the JPEG library error mechanism; the second 785 * table pointer is used for this purpose. 786 * 787 * First table includes all errors generated by JPEG library itself. 788 * Error code 0 is reserved for a "no such error string" message. 789 */ 790 const char * const * jpeg_message_table; /* Library errors */ 791 int last_jpeg_message; /* Table contains strings 0..last_jpeg_message */ 792 /* Second table can be added by application (see cjpeg/djpeg for example). 793 * It contains strings numbered first_addon_message..last_addon_message. 794 */ 795 const char * const * addon_message_table; /* Non-library errors */ 796 int first_addon_message; /* code for first string in addon table */ 797 int last_addon_message; /* code for last string in addon table */ 798}; 799 800 801/* Progress monitor object */ 802 803struct jpeg_progress_mgr { 804 JMETHOD(void, progress_monitor, (j_common_ptr cinfo)); 805 806 long pass_counter; /* work units completed in this pass */ 807 long pass_limit; /* total number of work units in this pass */ 808 int completed_passes; /* passes completed so far */ 809 int total_passes; /* total number of passes expected */ 810}; 811 812 813/* Data destination object for compression */ 814 815struct jpeg_destination_mgr { 816 JOCTET * next_output_byte; /* => next byte to write in buffer */ 817 size_t free_in_buffer; /* # of byte spaces remaining in buffer */ 818 819 JMETHOD(void, init_destination, (j_compress_ptr cinfo)); 820 JMETHOD(boolean, empty_output_buffer, (j_compress_ptr cinfo)); 821 JMETHOD(void, term_destination, (j_compress_ptr cinfo)); 822}; 823 824 825/* Data source object for decompression */ 826 827struct jpeg_source_mgr { 828 const JOCTET * next_input_byte; /* => next byte to read from buffer */ 829 size_t bytes_in_buffer; /* # of bytes remaining in buffer */ 830 831 JMETHOD(void, init_source, (j_decompress_ptr cinfo)); 832 JMETHOD(boolean, fill_input_buffer, (j_decompress_ptr cinfo)); 833 JMETHOD(void, skip_input_data, (j_decompress_ptr cinfo, long num_bytes)); 834 JMETHOD(boolean, resync_to_restart, (j_decompress_ptr cinfo, int desired)); 835 JMETHOD(void, term_source, (j_decompress_ptr cinfo)); 836}; 837 838 839/* Memory manager object. 840 * Allocates "small" objects (a few K total), "large" objects (tens of K), 841 * and "really big" objects (virtual arrays with backing store if needed). 842 * The memory manager does not allow individual objects to be freed; rather, 843 * each created object is assigned to a pool, and whole pools can be freed 844 * at once. This is faster and more convenient than remembering exactly what 845 * to free, especially where malloc()/free() are not too speedy. 846 * NB: alloc routines never return NULL. They exit to error_exit if not 847 * successful. 848 */ 849 850#define JPOOL_PERMANENT 0 /* lasts until master record is destroyed */ 851#define JPOOL_IMAGE 1 /* lasts until done with image/datastream */ 852#define JPOOL_NUMPOOLS 2 853 854typedef struct jvirt_sarray_control * jvirt_sarray_ptr; 855typedef struct jvirt_barray_control * jvirt_barray_ptr; 856 857 858struct jpeg_memory_mgr { 859 /* Method pointers */ 860 JMETHOD(void *, alloc_small, (j_common_ptr cinfo, int pool_id, 861 size_t sizeofobject)); 862 JMETHOD(void *, alloc_large, (j_common_ptr cinfo, int pool_id, 863 size_t sizeofobject)); 864 JMETHOD(JSAMPARRAY, alloc_sarray, (j_common_ptr cinfo, int pool_id, 865 JDIMENSION samplesperrow, 866 JDIMENSION numrows)); 867 JMETHOD(JBLOCKARRAY, alloc_barray, (j_common_ptr cinfo, int pool_id, 868 JDIMENSION blocksperrow, 869 JDIMENSION numrows)); 870 JMETHOD(jvirt_sarray_ptr, request_virt_sarray, (j_common_ptr cinfo, 871 int pool_id, 872 boolean pre_zero, 873 JDIMENSION samplesperrow, 874 JDIMENSION numrows, 875 JDIMENSION maxaccess)); 876 JMETHOD(jvirt_barray_ptr, request_virt_barray, (j_common_ptr cinfo, 877 int pool_id, 878 boolean pre_zero, 879 JDIMENSION blocksperrow, 880 JDIMENSION numrows, 881 JDIMENSION maxaccess)); 882 JMETHOD(void, realize_virt_arrays, (j_common_ptr cinfo)); 883 JMETHOD(JSAMPARRAY, access_virt_sarray, (j_common_ptr cinfo, 884 jvirt_sarray_ptr ptr, 885 JDIMENSION start_row, 886 JDIMENSION num_rows, 887 boolean writable)); 888 JMETHOD(JBLOCKARRAY, access_virt_barray, (j_common_ptr cinfo, 889 jvirt_barray_ptr ptr, 890 JDIMENSION start_row, 891 JDIMENSION num_rows, 892 boolean writable)); 893 JMETHOD(void, free_pool, (j_common_ptr cinfo, int pool_id)); 894 JMETHOD(void, self_destruct, (j_common_ptr cinfo)); 895 896 /* Limit on memory allocation for this JPEG object. (Note that this is 897 * merely advisory, not a guaranteed maximum; it only affects the space 898 * used for virtual-array buffers.) May be changed by outer application 899 * after creating the JPEG object. 900 */ 901 long max_memory_to_use; 902 903 /* Maximum allocation request accepted by alloc_large. */ 904 long max_alloc_chunk; 905}; 906 907 908/* Routine signature for application-supplied marker processing methods. 909 * Need not pass marker code since it is stored in cinfo->unread_marker. 910 */ 911typedef JMETHOD(boolean, jpeg_marker_parser_method, (j_decompress_ptr cinfo)); 912 913 914/* Declarations for routines called by application. 915 * The JPP macro hides prototype parameters from compilers that can't cope. 916 * Note JPP requires double parentheses. 917 */ 918 919#ifdef HAVE_PROTOTYPES 920#define JPP(arglist) arglist 921#else 922#define JPP(arglist) () 923#endif 924 925 926/* Short forms of external names for systems with brain-damaged linkers. 927 * We shorten external names to be unique in the first six letters, which 928 * is good enough for all known systems. 929 * (If your compiler itself needs names to be unique in less than 15 930 * characters, you are out of luck. Get a better compiler.) 931 */ 932 933#ifdef NEED_SHORT_EXTERNAL_NAMES 934#define jpeg_std_error jStdError 935#define jpeg_CreateCompress jCreaCompress 936#define jpeg_CreateDecompress jCreaDecompress 937#define jpeg_destroy_compress jDestCompress 938#define jpeg_destroy_decompress jDestDecompress 939#define jpeg_stdio_dest jStdDest 940#define jpeg_stdio_src jStdSrc 941#define jpeg_set_defaults jSetDefaults 942#define jpeg_set_colorspace jSetColorspace 943#define jpeg_default_colorspace jDefColorspace 944#define jpeg_set_quality jSetQuality 945#define jpeg_set_linear_quality jSetLQuality 946#define jpeg_add_quant_table jAddQuantTable 947#define jpeg_quality_scaling jQualityScaling 948#define jpeg_simple_progression jSimProgress 949#define jpeg_suppress_tables jSuppressTables 950#define jpeg_alloc_quant_table jAlcQTable 951#define jpeg_alloc_huff_table jAlcHTable 952#define jpeg_start_compress jStrtCompress 953#define jpeg_write_scanlines jWrtScanlines 954#define jpeg_finish_compress jFinCompress 955#define jpeg_write_raw_data jWrtRawData 956#define jpeg_write_marker jWrtMarker 957#define jpeg_write_m_header jWrtMHeader 958#define jpeg_write_m_byte jWrtMByte 959#define jpeg_write_tables jWrtTables 960#define jpeg_read_header jReadHeader 961#define jpeg_start_decompress jStrtDecompress 962#define jpeg_read_scanlines jReadScanlines 963#define jpeg_finish_decompress jFinDecompress 964#define jpeg_read_raw_data jReadRawData 965#define jpeg_has_multiple_scans jHasMultScn 966#define jpeg_start_output jStrtOutput 967#define jpeg_finish_output jFinOutput 968#define jpeg_input_complete jInComplete 969#define jpeg_new_colormap jNewCMap 970#define jpeg_consume_input jConsumeInput 971#define jpeg_calc_output_dimensions jCalcDimensions 972#define jpeg_save_markers jSaveMarkers 973#define jpeg_set_marker_processor jSetMarker 974#define jpeg_read_coefficients jReadCoefs 975#define jpeg_write_coefficients jWrtCoefs 976#define jpeg_copy_critical_parameters jCopyCrit 977#define jpeg_abort_compress jAbrtCompress 978#define jpeg_abort_decompress jAbrtDecompress 979#define jpeg_abort jAbort 980#define jpeg_destroy jDestroy 981#define jpeg_resync_to_restart jResyncRestart 982#endif /* NEED_SHORT_EXTERNAL_NAMES */ 983 984 985/* Default error-management setup */ 986EXTERN(struct jpeg_error_mgr *) jpeg_std_error 987 JPP((struct jpeg_error_mgr * err)); 988 989/* Initialization of JPEG compression objects. 990 * jpeg_create_compress() and jpeg_create_decompress() are the exported 991 * names that applications should call. These expand to calls on 992 * jpeg_CreateCompress and jpeg_CreateDecompress with additional information 993 * passed for version mismatch checking. 994 * NB: you must set up the error-manager BEFORE calling jpeg_create_xxx. 995 */ 996#define jpeg_create_compress(cinfo) \ 997 jpeg_CreateCompress((cinfo), JPEG_LIB_VERSION, \ 998 (size_t) sizeof(struct jpeg_compress_struct)) 999#define jpeg_create_decompress(cinfo) \ 1000 jpeg_CreateDecompress((cinfo), JPEG_LIB_VERSION, \ 1001 (size_t) sizeof(struct jpeg_decompress_struct)) 1002EXTERN(void) jpeg_CreateCompress JPP((j_compress_ptr cinfo, 1003 int version, size_t structsize)); 1004EXTERN(void) jpeg_CreateDecompress JPP((j_decompress_ptr cinfo, 1005 int version, size_t structsize)); 1006/* Destruction of JPEG compression objects */ 1007EXTERN(void) jpeg_destroy_compress JPP((j_compress_ptr cinfo)); 1008EXTERN(void) jpeg_destroy_decompress JPP((j_decompress_ptr cinfo)); 1009 1010#if 0 1011/* Standard data source and destination managers: stdio streams. */ 1012/* Caller is responsible for opening the file before and closing after. */ 1013EXTERN(void) jpeg_stdio_dest JPP((j_compress_ptr cinfo, FXSYS_FILE * outfile)); 1014EXTERN(void) jpeg_stdio_src JPP((j_decompress_ptr cinfo, FXSYS_FILE * infile)); 1015#endif 1016 1017/* Default parameter setup for compression */ 1018EXTERN(void) jpeg_set_defaults JPP((j_compress_ptr cinfo)); 1019/* Compression parameter setup aids */ 1020EXTERN(void) jpeg_set_colorspace JPP((j_compress_ptr cinfo, 1021 J_COLOR_SPACE colorspace)); 1022EXTERN(void) jpeg_default_colorspace JPP((j_compress_ptr cinfo)); 1023EXTERN(void) jpeg_set_quality JPP((j_compress_ptr cinfo, int quality, 1024 boolean force_baseline)); 1025EXTERN(void) jpeg_set_linear_quality JPP((j_compress_ptr cinfo, 1026 int scale_factor, 1027 boolean force_baseline)); 1028EXTERN(void) jpeg_add_quant_table JPP((j_compress_ptr cinfo, int which_tbl, 1029 const unsigned int *basic_table, 1030 int scale_factor, 1031 boolean force_baseline)); 1032EXTERN(int) jpeg_quality_scaling JPP((int quality)); 1033EXTERN(void) jpeg_simple_progression JPP((j_compress_ptr cinfo)); 1034EXTERN(void) jpeg_suppress_tables JPP((j_compress_ptr cinfo, 1035 boolean suppress)); 1036EXTERN(JQUANT_TBL *) jpeg_alloc_quant_table JPP((j_common_ptr cinfo)); 1037EXTERN(JHUFF_TBL *) jpeg_alloc_huff_table JPP((j_common_ptr cinfo)); 1038 1039/* Main entry points for compression */ 1040EXTERN(void) jpeg_start_compress JPP((j_compress_ptr cinfo, 1041 boolean write_all_tables)); 1042EXTERN(JDIMENSION) jpeg_write_scanlines JPP((j_compress_ptr cinfo, 1043 JSAMPARRAY scanlines, 1044 JDIMENSION num_lines)); 1045EXTERN(void) jpeg_finish_compress JPP((j_compress_ptr cinfo)); 1046 1047/* Replaces jpeg_write_scanlines when writing raw downsampled data. */ 1048EXTERN(JDIMENSION) jpeg_write_raw_data JPP((j_compress_ptr cinfo, 1049 JSAMPIMAGE data, 1050 JDIMENSION num_lines)); 1051 1052/* Write a special marker. See libjpeg.doc concerning safe usage. */ 1053EXTERN(void) jpeg_write_marker 1054 JPP((j_compress_ptr cinfo, int marker, 1055 const JOCTET * dataptr, unsigned int datalen)); 1056/* Same, but piecemeal. */ 1057EXTERN(void) jpeg_write_m_header 1058 JPP((j_compress_ptr cinfo, int marker, unsigned int datalen)); 1059EXTERN(void) jpeg_write_m_byte 1060 JPP((j_compress_ptr cinfo, int val)); 1061 1062/* Alternate compression function: just write an abbreviated table file */ 1063EXTERN(void) jpeg_write_tables JPP((j_compress_ptr cinfo)); 1064 1065/* Decompression startup: read start of JPEG datastream to see what's there */ 1066EXTERN(int) jpeg_read_header JPP((j_decompress_ptr cinfo, 1067 boolean require_image)); 1068/* Return value is one of: */ 1069#define JPEG_SUSPENDED 0 /* Suspended due to lack of input data */ 1070#define JPEG_HEADER_OK 1 /* Found valid image datastream */ 1071#define JPEG_HEADER_TABLES_ONLY 2 /* Found valid table-specs-only datastream */ 1072/* If you pass require_image = TRUE (normal case), you need not check for 1073 * a TABLES_ONLY return code; an abbreviated file will cause an error exit. 1074 * JPEG_SUSPENDED is only possible if you use a data source module that can 1075 * give a suspension return (the stdio source module doesn't). 1076 */ 1077 1078/* Main entry points for decompression */ 1079EXTERN(boolean) jpeg_start_decompress JPP((j_decompress_ptr cinfo)); 1080EXTERN(JDIMENSION) jpeg_read_scanlines JPP((j_decompress_ptr cinfo, 1081 JSAMPARRAY scanlines, 1082 JDIMENSION max_lines)); 1083EXTERN(boolean) jpeg_finish_decompress JPP((j_decompress_ptr cinfo)); 1084 1085/* Replaces jpeg_read_scanlines when reading raw downsampled data. */ 1086EXTERN(JDIMENSION) jpeg_read_raw_data JPP((j_decompress_ptr cinfo, 1087 JSAMPIMAGE data, 1088 JDIMENSION max_lines)); 1089 1090/* Additional entry points for buffered-image mode. */ 1091EXTERN(boolean) jpeg_has_multiple_scans JPP((j_decompress_ptr cinfo)); 1092EXTERN(boolean) jpeg_start_output JPP((j_decompress_ptr cinfo, 1093 int scan_number)); 1094EXTERN(boolean) jpeg_finish_output JPP((j_decompress_ptr cinfo)); 1095EXTERN(boolean) jpeg_input_complete JPP((j_decompress_ptr cinfo)); 1096EXTERN(void) jpeg_new_colormap JPP((j_decompress_ptr cinfo)); 1097EXTERN(int) jpeg_consume_input JPP((j_decompress_ptr cinfo)); 1098/* Return value is one of: */ 1099/* #define JPEG_SUSPENDED 0 Suspended due to lack of input data */ 1100#define JPEG_REACHED_SOS 1 /* Reached start of new scan */ 1101#define JPEG_REACHED_EOI 2 /* Reached end of image */ 1102#define JPEG_ROW_COMPLETED 3 /* Completed one iMCU row */ 1103#define JPEG_SCAN_COMPLETED 4 /* Completed last iMCU row of a scan */ 1104 1105/* Precalculate output dimensions for current decompression parameters. */ 1106EXTERN(void) jpeg_calc_output_dimensions JPP((j_decompress_ptr cinfo)); 1107 1108/* Control saving of COM and APPn markers into marker_list. */ 1109EXTERN(void) jpeg_save_markers 1110 JPP((j_decompress_ptr cinfo, int marker_code, 1111 unsigned int length_limit)); 1112 1113/* Install a special processing method for COM or APPn markers. */ 1114EXTERN(void) jpeg_set_marker_processor 1115 JPP((j_decompress_ptr cinfo, int marker_code, 1116 jpeg_marker_parser_method routine)); 1117 1118/* Read or write raw DCT coefficients --- useful for lossless transcoding. */ 1119EXTERN(jvirt_barray_ptr *) jpeg_read_coefficients JPP((j_decompress_ptr cinfo)); 1120EXTERN(void) jpeg_write_coefficients JPP((j_compress_ptr cinfo, 1121 jvirt_barray_ptr * coef_arrays)); 1122EXTERN(void) jpeg_copy_critical_parameters JPP((j_decompress_ptr srcinfo, 1123 j_compress_ptr dstinfo)); 1124 1125/* If you choose to abort compression or decompression before completing 1126 * jpeg_finish_(de)compress, then you need to clean up to release memory, 1127 * temporary files, etc. You can just call jpeg_destroy_(de)compress 1128 * if you're done with the JPEG object, but if you want to clean it up and 1129 * reuse it, call this: 1130 */ 1131EXTERN(void) jpeg_abort_compress JPP((j_compress_ptr cinfo)); 1132EXTERN(void) jpeg_abort_decompress JPP((j_decompress_ptr cinfo)); 1133 1134/* Generic versions of jpeg_abort and jpeg_destroy that work on either 1135 * flavor of JPEG object. These may be more convenient in some places. 1136 */ 1137EXTERN(void) jpeg_abort JPP((j_common_ptr cinfo)); 1138EXTERN(void) jpeg_destroy JPP((j_common_ptr cinfo)); 1139 1140/* Default restart-marker-resync procedure for use by data source modules */ 1141EXTERN(boolean) jpeg_resync_to_restart JPP((j_decompress_ptr cinfo, 1142 int desired)); 1143 1144 1145/* These marker codes are exported since applications and data source modules 1146 * are likely to want to use them. 1147 */ 1148 1149#define JPEG_RST0 0xD0 /* RST0 marker code */ 1150#define JPEG_EOI 0xD9 /* EOI marker code */ 1151#define JPEG_APP0 0xE0 /* APP0 marker code */ 1152#define JPEG_COM 0xFE /* COM marker code */ 1153 1154 1155/* If we have a brain-damaged compiler that emits warnings (or worse, errors) 1156 * for structure definitions that are never filled in, keep it quiet by 1157 * supplying dummy definitions for the various substructures. 1158 */ 1159 1160#ifdef INCOMPLETE_TYPES_BROKEN 1161#ifndef JPEG_INTERNALS /* will be defined in jpegint.h */ 1162struct jvirt_sarray_control { long dummy; }; 1163struct jvirt_barray_control { long dummy; }; 1164struct jpeg_comp_master { long dummy; }; 1165struct jpeg_c_main_controller { long dummy; }; 1166struct jpeg_c_prep_controller { long dummy; }; 1167struct jpeg_c_coef_controller { long dummy; }; 1168struct jpeg_marker_writer { long dummy; }; 1169struct jpeg_color_converter { long dummy; }; 1170struct jpeg_downsampler { long dummy; }; 1171struct jpeg_forward_dct { long dummy; }; 1172struct jpeg_entropy_encoder { long dummy; }; 1173struct jpeg_decomp_master { long dummy; }; 1174struct jpeg_d_main_controller { long dummy; }; 1175struct jpeg_d_coef_controller { long dummy; }; 1176struct jpeg_d_post_controller { long dummy; }; 1177struct jpeg_input_controller { long dummy; }; 1178struct jpeg_marker_reader { long dummy; }; 1179struct jpeg_entropy_decoder { long dummy; }; 1180struct jpeg_inverse_dct { long dummy; }; 1181struct jpeg_upsampler { long dummy; }; 1182struct jpeg_color_deconverter { long dummy; }; 1183struct jpeg_color_quantizer { long dummy; }; 1184#endif /* JPEG_INTERNALS */ 1185#endif /* INCOMPLETE_TYPES_BROKEN */ 1186 1187 1188/* 1189 * The JPEG library modules define JPEG_INTERNALS before including this file. 1190 * The internal structure declarations are read only when that is true. 1191 * Applications using the library should not include jpegint.h, but may wish 1192 * to include jerror.h. 1193 */ 1194 1195#ifdef JPEG_INTERNALS 1196#include "jpegint.h" /* fetch private declarations */ 1197#include "jerror.h" /* fetch error codes too */ 1198#endif 1199 1200#endif /* JPEGLIB_H */ 1201