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 /* 17 * First we include the configuration files that record how this 18 * installation of the JPEG library is set up. jconfig.h can be 19 * generated automatically for many systems. jmorecfg.h contains 20 * manual configuration options that most people need not worry about. 21 */ 22 23 #ifndef JCONFIG_INCLUDED /* in case jinclude.h already did */ 24 #include "jconfig16.h" /* widely used configuration options */ 25 #endif 26 #include "jmorecfg16.h" /* seldom changed options */ 27 28 29 /* Version ID for the JPEG library. 30 * Might be useful for tests like "#if JPEG_LIB_VERSION >= 60". 31 */ 32 33 #define JPEG_LIB_VERSION 62 /* Version 6b */ 34 35 36 /* Various constants determining the sizes of things. 37 * All of these are specified by the JPEG standard, so don't change them 38 * if you want to be compatible. 39 */ 40 41 #define DCTSIZE 8 /* The basic DCT block is 8x8 samples */ 42 #define DCTSIZE2 64 /* DCTSIZE squared; # of elements in a block */ 43 #define NUM_QUANT_TBLS 4 /* Quantization tables are numbered 0..3 */ 44 #define NUM_HUFF_TBLS 4 /* Huffman tables are numbered 0..3 */ 45 #define NUM_ARITH_TBLS 16 /* Arith-coding tables are numbered 0..15 */ 46 #define MAX_COMPS_IN_SCAN 4 /* JPEG limit on # of components in one scan */ 47 #define MAX_SAMP_FACTOR 4 /* JPEG limit on sampling factors */ 48 /* Unfortunately, some bozo at Adobe saw no reason to be bound by the standard; 49 * the PostScript DCT filter can emit files with many more than 10 data units 50 * per MCU. 51 * If you happen to run across such a file, you can up D_MAX_DATA_UNITS_IN_MCU 52 * to handle it. We even let you do this from the jconfig.h file. However, 53 * we strongly discourage changing C_MAX_DATA_UNITS_IN_MCU; just because Adobe 54 * sometimes emits noncompliant files doesn't mean you should too. 55 */ 56 #define C_MAX_DATA_UNITS_IN_MCU 10 /* compressor's limit on data units/MCU */ 57 #ifndef D_MAX_DATA_UNITS_IN_MCU 58 #define D_MAX_DATA_UNITS_IN_MCU 10 /* decompressor's limit on data units/MCU */ 59 #endif 60 61 62 /* Data structures for images (arrays of samples and of DCT coefficients). 63 * On 80x86 machines, the image arrays are too big for near pointers, 64 * but the pointer arrays can fit in near memory. 65 */ 66 67 typedef JSAMPLE FAR *JSAMPROW; /* ptr to one image row of pixel samples. */ 68 typedef JSAMPROW *JSAMPARRAY; /* ptr to some rows (a 2-D sample array) */ 69 typedef JSAMPARRAY *JSAMPIMAGE; /* a 3-D sample array: top index is color */ 70 71 typedef JCOEF JBLOCK[DCTSIZE2]; /* one block of coefficients */ 72 typedef JBLOCK FAR *JBLOCKROW; /* pointer to one row of coefficient blocks */ 73 typedef JBLOCKROW *JBLOCKARRAY; /* a 2-D array of coefficient blocks */ 74 typedef JBLOCKARRAY *JBLOCKIMAGE; /* a 3-D array of coefficient blocks */ 75 76 typedef JCOEF FAR *JCOEFPTR; /* useful in a couple of places */ 77 78 typedef JDIFF FAR *JDIFFROW; /* pointer to one row of difference values */ 79 typedef JDIFFROW *JDIFFARRAY; /* ptr to some rows (a 2-D diff array) */ 80 typedef JDIFFARRAY *JDIFFIMAGE; /* a 3-D diff array: top index is color */ 81 82 83 /* Types for JPEG compression parameters and working tables. */ 84 85 86 /* DCT coefficient quantization tables. */ 87 88 typedef struct { 89 /* This array gives the coefficient quantizers in natural array order 90 * (not the zigzag order in which they are stored in a JPEG DQT marker). 91 * CAUTION: IJG versions prior to v6a kept this array in zigzag order. 92 */ 93 UINT16 quantval[DCTSIZE2]; /* quantization step for each coefficient */ 94 /* This field is used only during compression. It's initialized FALSE when 95 * the table is created, and set TRUE when it's been output to the file. 96 * You could suppress output of a table by setting this to TRUE. 97 * (See jpeg_suppress_tables for an example.) 98 */ 99 boolean sent_table; /* TRUE when table has been output */ 100 } JQUANT_TBL; 101 102 103 /* Huffman coding tables. */ 104 105 typedef struct { 106 /* These two fields directly represent the contents of a JPEG DHT marker */ 107 UINT8 bits[17]; /* bits[k] = # of symbols with codes of */ 108 /* length k bits; bits[0] is unused */ 109 UINT8 huffval[256]; /* The symbols, in order of incr code length */ 110 /* This field is used only during compression. It's initialized FALSE when 111 * the table is created, and set TRUE when it's been output to the file. 112 * You could suppress output of a table by setting this to TRUE. 113 * (See jpeg_suppress_tables for an example.) 114 */ 115 boolean sent_table; /* TRUE when table has been output */ 116 } JHUFF_TBL; 117 118 119 /* Basic info about one component (color channel). */ 120 121 typedef struct { 122 /* These values are fixed over the whole image. */ 123 /* For compression, they must be supplied by parameter setup; */ 124 /* for decompression, they are read from the SOF marker. */ 125 int component_id; /* identifier for this component (0..255) */ 126 int component_index; /* its index in SOF or cinfo->comp_info[] */ 127 int h_samp_factor; /* horizontal sampling factor (1..4) */ 128 int v_samp_factor; /* vertical sampling factor (1..4) */ 129 int quant_tbl_no; /* quantization table selector (0..3) */ 130 /* These values may vary between scans. */ 131 /* For compression, they must be supplied by parameter setup; */ 132 /* for decompression, they are read from the SOS marker. */ 133 /* The decompressor output side may not use these variables. */ 134 int dc_tbl_no; /* DC entropy table selector (0..3) */ 135 int ac_tbl_no; /* AC entropy table selector (0..3) */ 136 137 /* Remaining fields should be treated as private by applications. */ 138 139 /* These values are computed during compression or decompression startup: */ 140 /* Component's size in data units. 141 * Any dummy data units added to complete an MCU are not counted; therefore 142 * these values do not depend on whether a scan is interleaved or not. 143 */ 144 JDIMENSION width_in_data_units; 145 JDIMENSION height_in_data_units; 146 /* Size of a data unit in/output by the codec (in samples). Always 147 * data_unit for compression. For decompression this is the size of the 148 * output from one data_unit, reflecting any processing performed by the 149 * codec. For example, in the DCT-based codec, scaling may be applied 150 * during the IDCT step. Values of 1,2,4,8 are likely to be supported. 151 * Note that different components may have different codec_data_unit sizes. 152 */ 153 int codec_data_unit; 154 /* The downsampled dimensions are the component's actual, unpadded number 155 * of samples at the main buffer (preprocessing/compression interface), thus 156 * downsampled_width = ceil(image_width * Hi/Hmax) 157 * and similarly for height. For decompression, codec-based processing is 158 * included (ie, IDCT scaling), so 159 * downsampled_width = ceil(image_width * Hi/Hmax * codec_data_unit/data_unit) 160 */ 161 JDIMENSION downsampled_width; /* actual width in samples */ 162 JDIMENSION downsampled_height; /* actual height in samples */ 163 /* This flag is used only for decompression. In cases where some of the 164 * components will be ignored (eg grayscale output from YCbCr image), 165 * we can skip most computations for the unused components. 166 */ 167 boolean component_needed; /* do we need the value of this component? */ 168 169 /* These values are computed before starting a scan of the component. */ 170 /* The decompressor output side may not use these variables. */ 171 int MCU_width; /* number of data units per MCU, horizontally */ 172 int MCU_height; /* number of data units per MCU, vertically */ 173 int MCU_data_units; /* MCU_width * MCU_height */ 174 int MCU_sample_width; /* MCU width in samples, MCU_width*codec_data_unit */ 175 int last_col_width; /* # of non-dummy data_units across in last MCU */ 176 int last_row_height; /* # of non-dummy data_units down in last MCU */ 177 178 /* Saved quantization table for component; NULL if none yet saved. 179 * See jdinput.c comments about the need for this information. 180 * This field is currently used only for decompression. 181 */ 182 JQUANT_TBL * quant_table; 183 184 /* Private per-component storage for DCT or IDCT subsystem. */ 185 void * dct_table; 186 } jpeg_component_info; 187 188 189 /* The script for encoding a multiple-scan file is an array of these: */ 190 191 typedef struct { 192 int comps_in_scan; /* number of components encoded in this scan */ 193 int component_index[MAX_COMPS_IN_SCAN]; /* their SOF/comp_info[] indexes */ 194 int Ss, Se; /* progressive JPEG spectral selection parms 195 lossless JPEG predictor select parm (Ss) */ 196 int Ah, Al; /* progressive JPEG successive approx. parms 197 lossless JPEG point transform parm (Al) */ 198 } jpeg_scan_info; 199 200 /* The decompressor can save APPn and COM markers in a list of these: */ 201 202 typedef struct jpeg_marker_struct FAR * jpeg_saved_marker_ptr; 203 204 struct jpeg_marker_struct { 205 jpeg_saved_marker_ptr next; /* next in list, or NULL */ 206 UINT8 marker; /* marker code: JPEG_COM, or JPEG_APP0+n */ 207 unsigned int original_length; /* # bytes of data in the file */ 208 unsigned int data_length; /* # bytes of data saved at data[] */ 209 JOCTET FAR * data; /* the data contained in the marker */ 210 /* the marker length word is not counted in data_length or original_length */ 211 }; 212 213 /* Known codec processes. */ 214 215 typedef enum { 216 JPROC_SEQUENTIAL, /* baseline/extended sequential DCT */ 217 JPROC_PROGRESSIVE, /* progressive DCT */ 218 JPROC_LOSSLESS /* lossless (sequential) */ 219 } J_CODEC_PROCESS; 220 221 /* Known color spaces. */ 222 223 typedef enum { 224 JCS_UNKNOWN, /* error/unspecified */ 225 JCS_GRAYSCALE, /* monochrome */ 226 JCS_RGB, /* red/green/blue */ 227 JCS_YCbCr, /* Y/Cb/Cr (also known as YUV) */ 228 JCS_CMYK, /* C/M/Y/K */ 229 JCS_YCCK /* Y/Cb/Cr/K */ 230 } J_COLOR_SPACE; 231 232 /* DCT/IDCT algorithm options. */ 233 234 typedef enum { 235 JDCT_ISLOW, /* slow but accurate integer algorithm */ 236 JDCT_IFAST, /* faster, less accurate integer method */ 237 JDCT_FLOAT /* floating-point: accurate, fast on fast HW */ 238 } J_DCT_METHOD; 239 240 #ifndef JDCT_DEFAULT /* may be overridden in jconfig.h */ 241 #define JDCT_DEFAULT JDCT_ISLOW 242 #endif 243 #ifndef JDCT_FASTEST /* may be overridden in jconfig.h */ 244 #define JDCT_FASTEST JDCT_IFAST 245 #endif 246 247 /* Dithering options for decompression. */ 248 249 typedef enum { 250 JDITHER_NONE, /* no dithering */ 251 JDITHER_ORDERED, /* simple ordered dither */ 252 JDITHER_FS /* Floyd-Steinberg error diffusion dither */ 253 } J_DITHER_MODE; 254 255 256 /* Common fields between JPEG compression and decompression master structs. */ 257 258 #define jpeg_common_fields \ 259 struct jpeg_error_mgr * err; /* Error handler module */\ 260 struct jpeg_memory_mgr * mem; /* Memory manager module */\ 261 struct jpeg_progress_mgr * progress; /* Progress monitor, or NULL if none */\ 262 void * client_data; /* Available for use by application */\ 263 boolean is_decompressor; /* So common code can tell which is which */\ 264 int global_state /* For checking call sequence validity */ 265 266 /* Routines that are to be used by both halves of the library are declared 267 * to receive a pointer to this structure. There are no actual instances of 268 * jpeg_common_struct, only of jpeg_compress_struct and jpeg_decompress_struct. 269 */ 270 struct jpeg_common_struct { 271 jpeg_common_fields; /* Fields common to both master struct types */ 272 /* Additional fields follow in an actual jpeg_compress_struct or 273 * jpeg_decompress_struct. All three structs must agree on these 274 * initial fields! (This would be a lot cleaner in C++.) 275 */ 276 }; 277 278 typedef struct jpeg_common_struct * j_common_ptr; 279 typedef struct jpeg_compress_struct * j_compress_ptr; 280 typedef struct jpeg_decompress_struct * j_decompress_ptr; 281 282 283 /* Master record for a compression instance */ 284 285 struct jpeg_compress_struct { 286 jpeg_common_fields; /* Fields shared with jpeg_decompress_struct */ 287 288 /* Destination for compressed data */ 289 struct jpeg_destination_mgr * dest; 290 291 /* Description of source image --- these fields must be filled in by 292 * outer application before starting compression. in_color_space must 293 * be correct before you can even call jpeg_set_defaults(). 294 */ 295 296 JDIMENSION image_width; /* input image width */ 297 JDIMENSION image_height; /* input image height */ 298 int input_components; /* # of color components in input image */ 299 J_COLOR_SPACE in_color_space; /* colorspace of input image */ 300 301 double input_gamma; /* image gamma of input image */ 302 303 /* Compression parameters --- these fields must be set before calling 304 * jpeg_start_compress(). We recommend calling jpeg_set_defaults() to 305 * initialize everything to reasonable defaults, then changing anything 306 * the application specifically wants to change. That way you won't get 307 * burnt when new parameters are added. Also note that there are several 308 * helper routines to simplify changing parameters. 309 */ 310 311 boolean lossless; /* TRUE=lossless encoding, FALSE=lossy */ 312 313 int data_precision; /* bits of precision in image data */ 314 315 int num_components; /* # of color components in JPEG image */ 316 J_COLOR_SPACE jpeg_color_space; /* colorspace of JPEG image */ 317 318 jpeg_component_info * comp_info; 319 /* comp_info[i] describes component that appears i'th in SOF */ 320 321 JQUANT_TBL * quant_tbl_ptrs[NUM_QUANT_TBLS]; 322 /* ptrs to coefficient quantization tables, or NULL if not defined */ 323 324 JHUFF_TBL * dc_huff_tbl_ptrs[NUM_HUFF_TBLS]; 325 JHUFF_TBL * ac_huff_tbl_ptrs[NUM_HUFF_TBLS]; 326 /* ptrs to Huffman coding tables, or NULL if not defined */ 327 328 UINT8 arith_dc_L[NUM_ARITH_TBLS]; /* L values for DC arith-coding tables */ 329 UINT8 arith_dc_U[NUM_ARITH_TBLS]; /* U values for DC arith-coding tables */ 330 UINT8 arith_ac_K[NUM_ARITH_TBLS]; /* Kx values for AC arith-coding tables */ 331 332 int num_scans; /* # of entries in scan_info array */ 333 const jpeg_scan_info * scan_info; /* script for multi-scan file, or NULL */ 334 /* The default value of scan_info is NULL, which causes a single-scan 335 * sequential JPEG file to be emitted. To create a multi-scan file, 336 * set num_scans and scan_info to point to an array of scan definitions. 337 */ 338 339 boolean raw_data_in; /* TRUE=caller supplies downsampled data */ 340 boolean arith_code; /* TRUE=arithmetic coding, FALSE=Huffman */ 341 boolean optimize_coding; /* TRUE=optimize entropy encoding parms */ 342 boolean CCIR601_sampling; /* TRUE=first samples are cosited */ 343 int smoothing_factor; /* 1..100, or 0 for no input smoothing */ 344 J_DCT_METHOD dct_method; /* DCT algorithm selector */ 345 346 /* The restart interval can be specified in absolute MCUs by setting 347 * restart_interval, or in MCU rows by setting restart_in_rows 348 * (in which case the correct restart_interval will be figured 349 * for each scan). 350 */ 351 unsigned int restart_interval; /* MCUs per restart, or 0 for no restart */ 352 int restart_in_rows; /* if > 0, MCU rows per restart interval */ 353 354 /* Parameters controlling emission of special markers. */ 355 356 boolean write_JFIF_header; /* should a JFIF marker be written? */ 357 UINT8 JFIF_major_version; /* What to write for the JFIF version number */ 358 UINT8 JFIF_minor_version; 359 /* These three values are not used by the JPEG code, merely copied */ 360 /* into the JFIF APP0 marker. density_unit can be 0 for unknown, */ 361 /* 1 for dots/inch, or 2 for dots/cm. Note that the pixel aspect */ 362 /* ratio is defined by X_density/Y_density even when density_unit=0. */ 363 UINT8 density_unit; /* JFIF code for pixel size units */ 364 UINT16 X_density; /* Horizontal pixel density */ 365 UINT16 Y_density; /* Vertical pixel density */ 366 boolean write_Adobe_marker; /* should an Adobe marker be written? */ 367 368 /* State variable: index of next scanline to be written to 369 * jpeg_write_scanlines(). Application may use this to control its 370 * processing loop, e.g., "while (next_scanline < image_height)". 371 */ 372 373 JDIMENSION next_scanline; /* 0 .. image_height-1 */ 374 375 /* Remaining fields are known throughout compressor, but generally 376 * should not be touched by a surrounding application. 377 */ 378 379 /* 380 * These fields are computed during compression startup 381 */ 382 int data_unit; /* size of data unit in samples */ 383 J_CODEC_PROCESS process; /* encoding process of JPEG image */ 384 385 int max_h_samp_factor; /* largest h_samp_factor */ 386 int max_v_samp_factor; /* largest v_samp_factor */ 387 388 JDIMENSION total_iMCU_rows; /* # of iMCU rows to be input to codec */ 389 /* The codec receives data in units of MCU rows as defined for fully 390 * interleaved scans (whether the JPEG file is interleaved or not). 391 * There are v_samp_factor * data_unit sample rows of each component in an 392 * "iMCU" (interleaved MCU) row. 393 */ 394 395 /* 396 * These fields are valid during any one scan. 397 * They describe the components and MCUs actually appearing in the scan. 398 */ 399 int comps_in_scan; /* # of JPEG components in this scan */ 400 jpeg_component_info * cur_comp_info[MAX_COMPS_IN_SCAN]; 401 /* *cur_comp_info[i] describes component that appears i'th in SOS */ 402 403 JDIMENSION MCUs_per_row; /* # of MCUs across the image */ 404 JDIMENSION MCU_rows_in_scan; /* # of MCU rows in the image */ 405 406 int data_units_in_MCU; /* # of data units per MCU */ 407 int MCU_membership[C_MAX_DATA_UNITS_IN_MCU]; 408 /* MCU_membership[i] is index in cur_comp_info of component owning */ 409 /* i'th block in an MCU */ 410 411 int Ss, Se, Ah, Al; /* progressive/lossless JPEG parameters for scan */ 412 413 /* 414 * Links to compression subobjects (methods and private variables of modules) 415 */ 416 struct jpeg_comp_master * master; 417 struct jpeg_c_main_controller * main; 418 struct jpeg_c_prep_controller * prep; 419 struct jpeg_c_codec * codec; 420 struct jpeg_marker_writer * marker; 421 struct jpeg_color_converter * cconvert; 422 struct jpeg_downsampler * downsample; 423 jpeg_scan_info * script_space; /* workspace for jpeg_simple_progression */ 424 int script_space_size; 425 426 /* force the use of an extended sequential SOF1 marker even when a 427 * SOF0 marker could be used, to comply with DICOM CP 1447. 428 * This is only needed for 8 bits/sample. */ 429 boolean force_extended_sequential_marker; 430 }; 431 432 433 /* Master record for a decompression instance */ 434 435 struct jpeg_decompress_struct { 436 jpeg_common_fields; /* Fields shared with jpeg_compress_struct */ 437 438 /* Source of compressed data */ 439 struct jpeg_source_mgr * src; 440 441 /* Basic description of image --- filled in by jpeg_read_header(). */ 442 /* Application may inspect these values to decide how to process image. */ 443 444 JDIMENSION image_width; /* nominal image width (from SOF marker) */ 445 JDIMENSION image_height; /* nominal image height */ 446 int num_components; /* # of color components in JPEG image */ 447 J_COLOR_SPACE jpeg_color_space; /* colorspace of JPEG image */ 448 449 /* Decompression processing parameters --- these fields must be set before 450 * calling jpeg_start_decompress(). Note that jpeg_read_header() initializes 451 * them to default values. 452 */ 453 454 J_COLOR_SPACE out_color_space; /* colorspace for output */ 455 456 unsigned int scale_num, scale_denom; /* fraction by which to scale image */ 457 458 double output_gamma; /* image gamma wanted in output */ 459 460 boolean buffered_image; /* TRUE=multiple output passes */ 461 boolean raw_data_out; /* TRUE=downsampled data wanted */ 462 463 J_DCT_METHOD dct_method; /* IDCT algorithm selector */ 464 boolean do_fancy_upsampling; /* TRUE=apply fancy upsampling */ 465 boolean do_block_smoothing; /* TRUE=apply interblock smoothing */ 466 467 boolean quantize_colors; /* TRUE=colormapped output wanted */ 468 /* the following are ignored if not quantize_colors: */ 469 J_DITHER_MODE dither_mode; /* type of color dithering to use */ 470 boolean two_pass_quantize; /* TRUE=use two-pass color quantization */ 471 int desired_number_of_colors; /* max # colors to use in created colormap */ 472 /* these are significant only in buffered-image mode: */ 473 boolean enable_1pass_quant; /* enable future use of 1-pass quantizer */ 474 boolean enable_external_quant;/* enable future use of external colormap */ 475 boolean enable_2pass_quant; /* enable future use of 2-pass quantizer */ 476 477 /* Description of actual output image that will be returned to application. 478 * These fields are computed by jpeg_start_decompress(). 479 * You can also use jpeg_calc_output_dimensions() to determine these values 480 * in advance of calling jpeg_start_decompress(). 481 */ 482 483 JDIMENSION output_width; /* scaled image width */ 484 JDIMENSION output_height; /* scaled image height */ 485 int out_color_components; /* # of color components in out_color_space */ 486 int output_components; /* # of color components returned */ 487 /* output_components is 1 (a colormap index) when quantizing colors; 488 * otherwise it equals out_color_components. 489 */ 490 int rec_outbuf_height; /* min recommended height of scanline buffer */ 491 /* If the buffer passed to jpeg_read_scanlines() is less than this many rows 492 * high, space and time will be wasted due to unnecessary data copying. 493 * Usually rec_outbuf_height will be 1 or 2, at most 4. 494 */ 495 496 /* When quantizing colors, the output colormap is described by these fields. 497 * The application can supply a colormap by setting colormap non-NULL before 498 * calling jpeg_start_decompress; otherwise a colormap is created during 499 * jpeg_start_decompress or jpeg_start_output. 500 * The map has out_color_components rows and actual_number_of_colors columns. 501 */ 502 int actual_number_of_colors; /* number of entries in use */ 503 JSAMPARRAY colormap; /* The color map as a 2-D pixel array */ 504 505 /* State variables: these variables indicate the progress of decompression. 506 * The application may examine these but must not modify them. 507 */ 508 509 /* Row index of next scanline to be read from jpeg_read_scanlines(). 510 * Application may use this to control its processing loop, e.g., 511 * "while (output_scanline < output_height)". 512 */ 513 JDIMENSION output_scanline; /* 0 .. output_height-1 */ 514 515 /* Current input scan number and number of iMCU rows completed in scan. 516 * These indicate the progress of the decompressor input side. 517 */ 518 int input_scan_number; /* Number of SOS markers seen so far */ 519 JDIMENSION input_iMCU_row; /* Number of iMCU rows completed */ 520 521 /* The "output scan number" is the notional scan being displayed by the 522 * output side. The decompressor will not allow output scan/row number 523 * to get ahead of input scan/row, but it can fall arbitrarily far behind. 524 */ 525 int output_scan_number; /* Nominal scan number being displayed */ 526 JDIMENSION output_iMCU_row; /* Number of iMCU rows read */ 527 528 /* Current progression status. coef_bits[c][i] indicates the precision 529 * with which component c's DCT coefficient i (in zigzag order) is known. 530 * It is -1 when no data has yet been received, otherwise it is the point 531 * transform (shift) value for the most recent scan of the coefficient 532 * (thus, 0 at completion of the progression). 533 * This pointer is NULL when reading a non-progressive file. 534 */ 535 int (*coef_bits)[DCTSIZE2]; /* -1 or current Al value for each coef */ 536 537 /* Internal JPEG parameters --- the application usually need not look at 538 * these fields. Note that the decompressor output side may not use 539 * any parameters that can change between scans. 540 */ 541 542 /* Quantization and Huffman tables are carried forward across input 543 * datastreams when processing abbreviated JPEG datastreams. 544 */ 545 546 JQUANT_TBL * quant_tbl_ptrs[NUM_QUANT_TBLS]; 547 /* ptrs to coefficient quantization tables, or NULL if not defined */ 548 549 JHUFF_TBL * dc_huff_tbl_ptrs[NUM_HUFF_TBLS]; 550 JHUFF_TBL * ac_huff_tbl_ptrs[NUM_HUFF_TBLS]; 551 /* ptrs to Huffman coding tables, or NULL if not defined */ 552 553 /* These parameters are never carried across datastreams, since they 554 * are given in SOF/SOS markers or defined to be reset by SOI. 555 */ 556 557 int data_precision; /* bits of precision in image data */ 558 559 jpeg_component_info * comp_info; 560 /* comp_info[i] describes component that appears i'th in SOF */ 561 562 boolean arith_code; /* TRUE=arithmetic coding, FALSE=Huffman */ 563 564 UINT8 arith_dc_L[NUM_ARITH_TBLS]; /* L values for DC arith-coding tables */ 565 UINT8 arith_dc_U[NUM_ARITH_TBLS]; /* U values for DC arith-coding tables */ 566 UINT8 arith_ac_K[NUM_ARITH_TBLS]; /* Kx values for AC arith-coding tables */ 567 568 unsigned int restart_interval; /* MCUs per restart interval, or 0 for no restart */ 569 570 /* These fields record data obtained from optional markers recognized by 571 * the JPEG library. 572 */ 573 boolean saw_JFIF_marker; /* TRUE iff a JFIF APP0 marker was found */ 574 /* Data copied from JFIF marker; only valid if saw_JFIF_marker is TRUE: */ 575 UINT8 JFIF_major_version; /* JFIF version number */ 576 UINT8 JFIF_minor_version; 577 UINT8 density_unit; /* JFIF code for pixel size units */ 578 UINT16 X_density; /* Horizontal pixel density */ 579 UINT16 Y_density; /* Vertical pixel density */ 580 boolean saw_Adobe_marker; /* TRUE iff an Adobe APP14 marker was found */ 581 UINT8 Adobe_transform; /* Color transform code from Adobe marker */ 582 583 boolean CCIR601_sampling; /* TRUE=first samples are cosited */ 584 585 /* Aside from the specific data retained from APPn markers known to the 586 * library, the uninterpreted contents of any or all APPn and COM markers 587 * can be saved in a list for examination by the application. 588 */ 589 jpeg_saved_marker_ptr marker_list; /* Head of list of saved markers */ 590 591 /* Remaining fields are known throughout decompressor, but generally 592 * should not be touched by a surrounding application. 593 */ 594 595 /* 596 * These fields are computed during decompression startup 597 */ 598 int data_unit; /* size of data unit in samples */ 599 J_CODEC_PROCESS process; /* decoding process of JPEG image */ 600 601 int max_h_samp_factor; /* largest h_samp_factor */ 602 int max_v_samp_factor; /* largest v_samp_factor */ 603 604 int min_codec_data_unit; /* smallest codec_data_unit of any component */ 605 606 JDIMENSION total_iMCU_rows; /* # of iMCU rows in image */ 607 /* The codec's input and output progress is measured in units of "iMCU" 608 * (interleaved MCU) rows. These are the same as MCU rows in fully 609 * interleaved JPEG scans, but are used whether the scan is interleaved 610 * or not. We define an iMCU row as v_samp_factor data_unit rows of each 611 * component. Therefore, the codec output contains 612 * v_samp_factor*codec_data_unit sample rows of a component per iMCU row. 613 */ 614 615 JSAMPLE * sample_range_limit; /* table for fast range-limiting */ 616 617 /* 618 * These fields are valid during any one scan. 619 * They describe the components and MCUs actually appearing in the scan. 620 * Note that the decompressor output side must not use these fields. 621 */ 622 int comps_in_scan; /* # of JPEG components in this scan */ 623 jpeg_component_info * cur_comp_info[MAX_COMPS_IN_SCAN]; 624 /* *cur_comp_info[i] describes component that appears i'th in SOS */ 625 626 JDIMENSION MCUs_per_row; /* # of MCUs across the image */ 627 JDIMENSION MCU_rows_in_scan; /* # of MCU rows in the image */ 628 629 int data_units_in_MCU; /* # of data _units per MCU */ 630 int MCU_membership[D_MAX_DATA_UNITS_IN_MCU]; 631 /* MCU_membership[i] is index in cur_comp_info of component owning */ 632 /* i'th data unit in an MCU */ 633 634 int Ss, Se, Ah, Al; /* progressive/lossless JPEG parms for scan */ 635 636 /* This field is shared between entropy decoder and marker parser. 637 * It is either zero or the code of a JPEG marker that has been 638 * read from the data source, but has not yet been processed. 639 */ 640 int unread_marker; 641 642 /* 643 * Links to decompression subobjects (methods, private variables of modules) 644 */ 645 struct jpeg_decomp_master * master; 646 struct jpeg_d_main_controller * main; 647 struct jpeg_d_codec * codec; 648 struct jpeg_d_post_controller * post; 649 struct jpeg_input_controller * inputctl; 650 struct jpeg_marker_reader * marker; 651 struct jpeg_upsampler * upsample; 652 struct jpeg_color_deconverter * cconvert; 653 struct jpeg_color_quantizer * cquantize; 654 655 /* Options that enable or disable various workarounds */ 656 unsigned int workaround_options; 657 }; 658 659 /* constants for workaround_options in struct jpeg_decompress_struct */ 660 #define WORKAROUND_PREDICTOR6OVERFLOW 1 661 #define WORKAROUND_BUGGY_CORNELL_16BIT_JPEG_ENCODER 2 662 663 /* "Object" declarations for JPEG modules that may be supplied or called 664 * directly by the surrounding application. 665 * As with all objects in the JPEG library, these structs only define the 666 * publicly visible methods and state variables of a module. Additional 667 * private fields may exist after the public ones. 668 */ 669 670 671 /* Error handler object */ 672 673 struct jpeg_error_mgr { 674 /* Error exit handler: does not return to caller */ 675 JMETHOD(void, error_exit, (j_common_ptr cinfo)); 676 /* Conditionally emit a trace or warning message */ 677 JMETHOD(void, emit_message, (j_common_ptr cinfo, int msg_level)); 678 /* Routine that actually outputs a trace or error message */ 679 JMETHOD(void, output_message, (j_common_ptr cinfo)); 680 /* Format a message string for the most recent JPEG error or message */ 681 JMETHOD(void, format_message, (j_common_ptr cinfo, char * buffer)); 682 #define JMSG_LENGTH_MAX 200 /* recommended size of format_message buffer */ 683 /* Reset error state variables at start of a new image */ 684 JMETHOD(void, reset_error_mgr, (j_common_ptr cinfo)); 685 686 /* The message ID code and any parameters are saved here. 687 * A message can have one string parameter or up to 8 int parameters. 688 */ 689 int msg_code; 690 #define JMSG_STR_PARM_MAX 80 691 union { 692 int i[8]; 693 char s[JMSG_STR_PARM_MAX]; 694 } msg_parm; 695 696 /* Standard state variables for error facility */ 697 698 int trace_level; /* max msg_level that will be displayed */ 699 700 /* For recoverable corrupt-data errors, we emit a warning message, 701 * but keep going unless emit_message chooses to abort. emit_message 702 * should count warnings in num_warnings. The surrounding application 703 * can check for bad data by seeing if num_warnings is nonzero at the 704 * end of processing. 705 */ 706 long num_warnings; /* number of corrupt-data warnings */ 707 708 /* These fields point to the table(s) of error message strings. 709 * An application can change the table pointer to switch to a different 710 * message list (typically, to change the language in which errors are 711 * reported). Some applications may wish to add additional error codes 712 * that will be handled by the JPEG library error mechanism; the second 713 * table pointer is used for this purpose. 714 * 715 * First table includes all errors generated by JPEG library itself. 716 * Error code 0 is reserved for a "no such error string" message. 717 */ 718 const char * const * jpeg_message_table; /* Library errors */ 719 int last_jpeg_message; /* Table contains strings 0..last_jpeg_message */ 720 /* Second table can be added by application (see cjpeg/djpeg for example). 721 * It contains strings numbered first_addon_message..last_addon_message. 722 */ 723 const char * const * addon_message_table; /* Non-library errors */ 724 int first_addon_message; /* code for first string in addon table */ 725 int last_addon_message; /* code for last string in addon table */ 726 }; 727 728 729 /* Progress monitor object */ 730 731 struct jpeg_progress_mgr { 732 JMETHOD(void, progress_monitor, (j_common_ptr cinfo)); 733 734 long pass_counter; /* work units completed in this pass */ 735 long pass_limit; /* total number of work units in this pass */ 736 int completed_passes; /* passes completed so far */ 737 int total_passes; /* total number of passes expected */ 738 }; 739 740 741 /* Data destination object for compression */ 742 743 struct jpeg_destination_mgr { 744 JOCTET * next_output_byte; /* => next byte to write in buffer */ 745 size_t free_in_buffer; /* # of byte spaces remaining in buffer */ 746 747 JMETHOD(void, init_destination, (j_compress_ptr cinfo)); 748 JMETHOD(boolean, empty_output_buffer, (j_compress_ptr cinfo)); 749 JMETHOD(void, term_destination, (j_compress_ptr cinfo)); 750 }; 751 752 753 /* Data source object for decompression */ 754 755 struct jpeg_source_mgr { 756 const JOCTET * next_input_byte; /* => next byte to read from buffer */ 757 size_t bytes_in_buffer; /* # of bytes remaining in buffer */ 758 759 JMETHOD(void, init_source, (j_decompress_ptr cinfo)); 760 JMETHOD(boolean, fill_input_buffer, (j_decompress_ptr cinfo)); 761 JMETHOD(void, skip_input_data, (j_decompress_ptr cinfo, long num_bytes)); 762 JMETHOD(boolean, resync_to_restart, (j_decompress_ptr cinfo, int desired)); 763 JMETHOD(void, term_source, (j_decompress_ptr cinfo)); 764 }; 765 766 767 /* Memory manager object. 768 * Allocates "small" objects (a few K total), "large" objects (tens of K), 769 * and "really big" objects (virtual arrays with backing store if needed). 770 * The memory manager does not allow individual objects to be freed; rather, 771 * each created object is assigned to a pool, and whole pools can be freed 772 * at once. This is faster and more convenient than remembering exactly what 773 * to free, especially where malloc()/free() are not too speedy. 774 * NB: alloc routines never return NULL. They exit to error_exit if not 775 * successful. 776 */ 777 778 #define JPOOL_PERMANENT 0 /* lasts until master record is destroyed */ 779 #define JPOOL_IMAGE 1 /* lasts until done with image/datastream */ 780 #define JPOOL_NUMPOOLS 2 781 782 typedef struct jvirt_sarray_control * jvirt_sarray_ptr; 783 typedef struct jvirt_barray_control * jvirt_barray_ptr; 784 785 786 #ifdef C_LOSSLESS_SUPPORTED 787 #define NEED_DARRAY 788 #else 789 #ifdef D_LOSSLESS_SUPPORTED 790 #define NEED_DARRAY 791 #endif 792 #endif 793 794 struct jpeg_memory_mgr { 795 /* Method pointers */ 796 JMETHOD(void *, alloc_small, (j_common_ptr cinfo, int pool_id, 797 size_t sizeofobject)); 798 JMETHOD(void FAR *, alloc_large, (j_common_ptr cinfo, int pool_id, 799 size_t sizeofobject)); 800 JMETHOD(JSAMPARRAY, alloc_sarray, (j_common_ptr cinfo, int pool_id, 801 JDIMENSION samplesperrow, 802 JDIMENSION numrows)); 803 JMETHOD(JBLOCKARRAY, alloc_barray, (j_common_ptr cinfo, int pool_id, 804 JDIMENSION blocksperrow, 805 JDIMENSION numrows)); 806 #ifdef NEED_DARRAY 807 JMETHOD(JDIFFARRAY, alloc_darray, (j_common_ptr cinfo, int pool_id, 808 JDIMENSION diffsperrow, 809 JDIMENSION numrows)); 810 #endif 811 JMETHOD(jvirt_sarray_ptr, request_virt_sarray, (j_common_ptr cinfo, 812 int pool_id, 813 boolean pre_zero, 814 JDIMENSION samplesperrow, 815 JDIMENSION numrows, 816 JDIMENSION maxaccess)); 817 JMETHOD(jvirt_barray_ptr, request_virt_barray, (j_common_ptr cinfo, 818 int pool_id, 819 boolean pre_zero, 820 JDIMENSION blocksperrow, 821 JDIMENSION numrows, 822 JDIMENSION maxaccess)); 823 JMETHOD(void, realize_virt_arrays, (j_common_ptr cinfo)); 824 JMETHOD(JSAMPARRAY, access_virt_sarray, (j_common_ptr cinfo, 825 jvirt_sarray_ptr ptr, 826 JDIMENSION start_row, 827 JDIMENSION num_rows, 828 boolean writable)); 829 JMETHOD(JBLOCKARRAY, access_virt_barray, (j_common_ptr cinfo, 830 jvirt_barray_ptr ptr, 831 JDIMENSION start_row, 832 JDIMENSION num_rows, 833 boolean writable)); 834 JMETHOD(void, free_pool, (j_common_ptr cinfo, int pool_id)); 835 JMETHOD(void, self_destruct, (j_common_ptr cinfo)); 836 837 /* Limit on memory allocation for this JPEG object. (Note that this is 838 * merely advisory, not a guaranteed maximum; it only affects the space 839 * used for virtual-array buffers.) May be changed by outer application 840 * after creating the JPEG object. 841 */ 842 long max_memory_to_use; 843 844 /* Maximum allocation request accepted by alloc_large. */ 845 long max_alloc_chunk; 846 }; 847 848 849 /* Routine signature for application-supplied marker processing methods. 850 * Need not pass marker code since it is stored in cinfo->unread_marker. 851 */ 852 typedef JMETHOD(boolean, jpeg_marker_parser_method, (j_decompress_ptr cinfo)); 853 854 855 /* Declarations for routines called by application. 856 * The JPP macro hides prototype parameters from compilers that can't cope. 857 * Note JPP requires double parentheses. 858 */ 859 860 #ifdef HAVE_PROTOTYPES 861 #define JPP(arglist) arglist 862 #else 863 #define JPP(arglist) () 864 #endif 865 866 867 /* Short forms of external names for systems with brain-damaged linkers. 868 * We shorten external names to be unique in the first six letters, which 869 * is good enough for all known systems. 870 * (If your compiler itself needs names to be unique in less than 15 871 * characters, you are out of luck. Get a better compiler.) 872 */ 873 874 /* MAKE SURE THAT ALL FUNCTIONS DECLARED GLOBAL() ARE RE-DEFINED HERE! */ 875 876 #ifdef NEED_SHORT_EXTERNAL_NAMES 877 #define jcopy_block_row jcopy16_block_row 878 #define jcopy_sample_rows jcopy16_sample_rows 879 #define jdiv_round_up jdiv16_round_up 880 #define jinit_1pass_quantizer jinit16_1pass_quantizer 881 #define jinit_2pass_quantizer jinit16_2pass_quantizer 882 #define jinit_arith_decoder jinit16_arith_decoder 883 #define jinit_arith_encoder jinit16_arith_encoder 884 #define jinit_c_codec jinit16_c_codec 885 #define jinit_c_coef_controller jinit16_c_coef_controller 886 #define jinit_c_diff_controller jinit16_c_diff_controller 887 #define jinit_c_main_controller jinit16_c_main_controller 888 #define jinit_c_master_control jinit16_c_master_control 889 #define jinit_c_prep_controller jinit16_c_prep_controller 890 #define jinit_c_scaler jinit16_c_scaler 891 #define jinit_color_converter jinit16_color_converter 892 #define jinit_color_deconverter jinit16_color_deconverter 893 #define jinit_compress_master jinit16_compress_master 894 #define jinit_d_codec jinit16_d_codec 895 #define jinit_d_coef_controller jinit16_d_coef_controller 896 #define jinit_d_diff_controller jinit16_d_diff_controller 897 #define jinit_d_main_controller jinit16_d_main_controller 898 #define jinit_d_post_controller jinit16_d_post_controller 899 #define jinit_d_post_controller jinit16_d_post_controller 900 #define jinit_d_scaler jinit16_d_scaler 901 #define jinit_differencer jinit16_differencer 902 #define jinit_downsampler jinit16_downsampler 903 #define jinit_forward_dct jinit16_forward_dct 904 #define jinit_input_controller jinit16_input_controller 905 #define jinit_inverse_dct jinit16_inverse_dct 906 #define jinit_lhuff_decoder jinit16_lhuff_decoder 907 #define jinit_lhuff_encoder jinit16_lhuff_encoder 908 #define jinit_lossless_c_codec jinit16_lossless_c_codec 909 #define jinit_lossless_d_codec jinit16_lossless_d_codec 910 #define jinit_lossy_c_codec jinit16_lossy_c_codec 911 #define jinit_lossy_d_codec jinit16_lossy_d_codec 912 #define jinit_marker_reader jinit16_marker_reader 913 #define jinit_marker_writer jinit16_marker_writer 914 #define jinit_master_decompress jinit16_master_decompress 915 #define jinit_memory_mgr jinit16_memory_mgr 916 #define jinit_merged_upsampler jinit16_merged_upsampler 917 #define jinit_phuff_decoder jinit16_phuff_decoder 918 #define jinit_phuff_encoder jinit16_phuff_encoder 919 #define jinit_shuff_decoder jinit16_shuff_decoder 920 #define jinit_shuff_encoder jinit16_shuff_encoder 921 #define jinit_undifferencer jinit16_undifferencer 922 #define jinit_upsampler jinit16_upsampler 923 #define jpeg_CreateCompress jpeg16_CreateCompress 924 #define jpeg_CreateDecompress jpeg16_CreateDecompress 925 #define jpeg_abort jpeg16_abort 926 #define jpeg_abort_compress jpeg16_abort_compress 927 #define jpeg_abort_decompress jpeg16_abort_decompress 928 #define jpeg_add_quant_table jpeg16_add_quant_table 929 #define jpeg_alloc_huff_table jpeg16_alloc_huff_table 930 #define jpeg_alloc_quant_table jpeg16_alloc_quant_table 931 #define jpeg_calc_output_dimensions jpeg16_calc_output_dimensions 932 #define jpeg_consume_input jpeg16_consume_input 933 #define jpeg_copy_critical_parameters jpeg16_copy_critical_parameters 934 #define jpeg_default_colorspace jpeg16_default_colorspace 935 #define jpeg_destroy jpeg16_destroy 936 #define jpeg_destroy_compress jpeg16_destroy_compress 937 #define jpeg_destroy_decompress jpeg16_destroy_decompress 938 #define jpeg_fdct_float jpeg16_fdct_float 939 #define jpeg_fdct_ifast jpeg16_fdct_ifast 940 #define jpeg_fdct_islow jpeg16_fdct_islow 941 #define jpeg_fill_bit_buffer jpeg16_fill_bit_buffer 942 #define jpeg_finish_compress jpeg16_finish_compress 943 #define jpeg_finish_decompress jpeg16_finish_decompress 944 #define jpeg_finish_output jpeg16_finish_output 945 #define jpeg_free_large jpeg16_free_large 946 #define jpeg_free_small jpeg16_free_small 947 #define jpeg_gen_optimal_table jpeg16_gen_optimal_table 948 #define jpeg_get_large jpeg16_get_large 949 #define jpeg_get_small jpeg16_get_small 950 #define jpeg_has_multiple_scans jpeg16_has_multiple_scans 951 #define jpeg_huff_decode jpeg16_huff_decode 952 #define jpeg_idct_1x1 jpeg16_idct_1x1 953 #define jpeg_idct_2x2 jpeg16_idct_2x2 954 #define jpeg_idct_4x4 jpeg16_idct_4x4 955 #define jpeg_idct_float jpeg16_idct_float 956 #define jpeg_idct_ifast jpeg16_idct_ifast 957 #define jpeg_idct_islow jpeg16_idct_islow 958 #define jpeg_input_complete jpeg16_input_complete 959 #define jpeg_make_c_derived_tbl jpeg16_make_c_derived_tbl 960 #define jpeg_make_d_derived_tbl jpeg16_make_d_derived_tbl 961 #define jpeg_mem_available jpeg16_mem_available 962 #define jpeg_mem_init jpeg16_mem_init 963 #define jpeg_mem_term jpeg16_mem_term 964 #define jpeg_new_colormap jpeg16_new_colormap 965 #define jpeg_open_backing_store jpeg16_open_backing_store 966 #define jpeg_quality_scaling jpeg16_quality_scaling 967 #define jpeg_read_coefficients jpeg16_read_coefficients 968 #define jpeg_read_header jpeg16_read_header 969 #define jpeg_read_raw_data jpeg16_read_raw_data 970 #define jpeg_read_scanlines jpeg16_read_scanlines 971 #define jpeg_resync_to_restart jpeg16_resync_to_restart 972 #define jpeg_save_markers jpeg16_save_markers 973 #define jpeg_set_colorspace jpeg16_set_colorspace 974 #define jpeg_set_defaults jpeg16_set_defaults 975 #define jpeg_set_linear_quality jpeg16_set_linear_quality 976 #define jpeg_set_marker_processor jpeg16_set_marker_processor 977 #define jpeg_set_quality jpeg16_set_quality 978 #define jpeg_simple_lossless jpeg16_simple_lossless 979 #define jpeg_simple_progression jpeg16_simple_progression 980 #define jpeg_start_compress jpeg16_start_compress 981 #define jpeg_start_decompress jpeg16_start_decompress 982 #define jpeg_start_output jpeg16_start_output 983 #define jpeg_std_error jpeg16_std_error 984 #define jpeg_stdio_dest jpeg16_stdio_dest 985 #define jpeg_stdio_src jpeg16_stdio_src 986 #define jpeg_suppress_tables jpeg16_suppress_tables 987 #define jpeg_write_coefficients jpeg16_write_coefficients 988 #define jpeg_write_m_byte jpeg16_write_m_byte 989 #define jpeg_write_m_header jpeg16_write_m_header 990 #define jpeg_write_marker jpeg16_write_marker 991 #define jpeg_write_raw_data jpeg16_write_raw_data 992 #define jpeg_write_scanlines jpeg16_write_scanlines 993 #define jpeg_write_tables jpeg16_write_tables 994 #define jround_up jround16_up 995 #define jzero_far jzero16_far 996 #endif /* NEED_SHORT_EXTERNAL_NAMES */ 997 998 999 /* Default error-management setup */ 1000 EXTERN(struct jpeg_error_mgr *) jpeg_std_error 1001 JPP((struct jpeg_error_mgr * err)); 1002 1003 /* Initialization of JPEG compression objects. 1004 * jpeg_create_compress() and jpeg_create_decompress() are the exported 1005 * names that applications should call. These expand to calls on 1006 * jpeg_CreateCompress and jpeg_CreateDecompress with additional information 1007 * passed for version mismatch checking. 1008 * NB: you must set up the error-manager BEFORE calling jpeg_create_xxx. 1009 */ 1010 #define jpeg_create_compress(cinfo) \ 1011 jpeg_CreateCompress((cinfo), JPEG_LIB_VERSION, \ 1012 (size_t) sizeof(struct jpeg_compress_struct)) 1013 #define jpeg_create_decompress(cinfo) \ 1014 jpeg_CreateDecompress((cinfo), JPEG_LIB_VERSION, \ 1015 (size_t) sizeof(struct jpeg_decompress_struct)) 1016 EXTERN(void) jpeg_CreateCompress JPP((j_compress_ptr cinfo, 1017 int version, size_t structsize)); 1018 EXTERN(void) jpeg_CreateDecompress JPP((j_decompress_ptr cinfo, 1019 int version, size_t structsize)); 1020 /* Destruction of JPEG compression objects */ 1021 EXTERN(void) jpeg_destroy_compress JPP((j_compress_ptr cinfo)); 1022 EXTERN(void) jpeg_destroy_decompress JPP((j_decompress_ptr cinfo)); 1023 1024 /* Standard data source and destination managers: stdio streams. */ 1025 /* Caller is responsible for opening the file before and closing after. */ 1026 EXTERN(void) jpeg_stdio_dest JPP((j_compress_ptr cinfo, FILE * outfile)); 1027 EXTERN(void) jpeg_stdio_src JPP((j_decompress_ptr cinfo, FILE * infile)); 1028 1029 /* Default parameter setup for compression */ 1030 EXTERN(void) jpeg_set_defaults JPP((j_compress_ptr cinfo)); 1031 /* Compression parameter setup aids */ 1032 EXTERN(void) jpeg_set_colorspace JPP((j_compress_ptr cinfo, 1033 J_COLOR_SPACE colorspace)); 1034 EXTERN(void) jpeg_default_colorspace JPP((j_compress_ptr cinfo)); 1035 EXTERN(void) jpeg_set_quality JPP((j_compress_ptr cinfo, int quality, 1036 boolean force_baseline)); 1037 EXTERN(void) jpeg_set_linear_quality JPP((j_compress_ptr cinfo, 1038 int scale_factor, 1039 boolean force_baseline)); 1040 EXTERN(void) jpeg_add_quant_table JPP((j_compress_ptr cinfo, int which_tbl, 1041 const unsigned int *basic_table, 1042 int scale_factor, 1043 boolean force_baseline)); 1044 EXTERN(int) jpeg_quality_scaling JPP((int quality)); 1045 EXTERN(void) jpeg_simple_lossless JPP((j_compress_ptr cinfo, 1046 int predictor, int point_transform)); 1047 EXTERN(void) jpeg_simple_progression JPP((j_compress_ptr cinfo)); 1048 EXTERN(void) jpeg_suppress_tables JPP((j_compress_ptr cinfo, 1049 boolean suppress)); 1050 EXTERN(JQUANT_TBL *) jpeg_alloc_quant_table JPP((j_common_ptr cinfo)); 1051 EXTERN(JHUFF_TBL *) jpeg_alloc_huff_table JPP((j_common_ptr cinfo)); 1052 1053 /* Main entry points for compression */ 1054 EXTERN(void) jpeg_start_compress JPP((j_compress_ptr cinfo, 1055 boolean write_all_tables)); 1056 EXTERN(JDIMENSION) jpeg_write_scanlines JPP((j_compress_ptr cinfo, 1057 JSAMPARRAY scanlines, 1058 JDIMENSION num_lines)); 1059 EXTERN(void) jpeg_finish_compress JPP((j_compress_ptr cinfo)); 1060 1061 /* Replaces jpeg_write_scanlines when writing raw downsampled data. */ 1062 EXTERN(JDIMENSION) jpeg_write_raw_data JPP((j_compress_ptr cinfo, 1063 JSAMPIMAGE data, 1064 JDIMENSION num_lines)); 1065 1066 /* Write a special marker. See libjpeg.doc concerning safe usage. */ 1067 EXTERN(void) jpeg_write_marker 1068 JPP((j_compress_ptr cinfo, int marker, 1069 const JOCTET * dataptr, unsigned int datalen)); 1070 /* Same, but piecemeal. */ 1071 EXTERN(void) jpeg_write_m_header 1072 JPP((j_compress_ptr cinfo, int marker, unsigned int datalen)); 1073 EXTERN(void) jpeg_write_m_byte 1074 JPP((j_compress_ptr cinfo, int val)); 1075 1076 /* Alternate compression function: just write an abbreviated table file */ 1077 EXTERN(void) jpeg_write_tables JPP((j_compress_ptr cinfo)); 1078 1079 /* Decompression startup: read start of JPEG datastream to see what's there */ 1080 EXTERN(int) jpeg_read_header JPP((j_decompress_ptr cinfo, 1081 boolean require_image)); 1082 /* Return value is one of: */ 1083 #define JPEG_SUSPENDED 0 /* Suspended due to lack of input data */ 1084 #define JPEG_HEADER_OK 1 /* Found valid image datastream */ 1085 #define JPEG_HEADER_TABLES_ONLY 2 /* Found valid table-specs-only datastream */ 1086 /* If you pass require_image = TRUE (normal case), you need not check for 1087 * a TABLES_ONLY return code; an abbreviated file will cause an error exit. 1088 * JPEG_SUSPENDED is only possible if you use a data source module that can 1089 * give a suspension return (the stdio source module doesn't). 1090 */ 1091 1092 /* Main entry points for decompression */ 1093 EXTERN(boolean) jpeg_start_decompress JPP((j_decompress_ptr cinfo)); 1094 EXTERN(JDIMENSION) jpeg_read_scanlines JPP((j_decompress_ptr cinfo, 1095 JSAMPARRAY scanlines, 1096 JDIMENSION max_lines)); 1097 EXTERN(boolean) jpeg_finish_decompress JPP((j_decompress_ptr cinfo)); 1098 1099 /* Replaces jpeg_read_scanlines when reading raw downsampled data. */ 1100 EXTERN(JDIMENSION) jpeg_read_raw_data JPP((j_decompress_ptr cinfo, 1101 JSAMPIMAGE data, 1102 JDIMENSION max_lines)); 1103 1104 /* Additional entry points for buffered-image mode. */ 1105 EXTERN(boolean) jpeg_has_multiple_scans JPP((j_decompress_ptr cinfo)); 1106 EXTERN(boolean) jpeg_start_output JPP((j_decompress_ptr cinfo, 1107 int scan_number)); 1108 EXTERN(boolean) jpeg_finish_output JPP((j_decompress_ptr cinfo)); 1109 EXTERN(boolean) jpeg_input_complete JPP((j_decompress_ptr cinfo)); 1110 EXTERN(void) jpeg_new_colormap JPP((j_decompress_ptr cinfo)); 1111 EXTERN(int) jpeg_consume_input JPP((j_decompress_ptr cinfo)); 1112 /* Return value is one of: */ 1113 /* #define JPEG_SUSPENDED 0 Suspended due to lack of input data */ 1114 #define JPEG_REACHED_SOS 1 /* Reached start of new scan */ 1115 #define JPEG_REACHED_EOI 2 /* Reached end of image */ 1116 #define JPEG_ROW_COMPLETED 3 /* Completed one iMCU row */ 1117 #define JPEG_SCAN_COMPLETED 4 /* Completed last iMCU row of a scan */ 1118 1119 /* Precalculate output dimensions for current decompression parameters. */ 1120 EXTERN(void) jpeg_calc_output_dimensions JPP((j_decompress_ptr cinfo)); 1121 1122 /* Control saving of COM and APPn markers into marker_list. */ 1123 EXTERN(void) jpeg_save_markers 1124 JPP((j_decompress_ptr cinfo, int marker_code, 1125 unsigned int length_limit)); 1126 1127 /* Install a special processing method for COM or APPn markers. */ 1128 EXTERN(void) jpeg_set_marker_processor 1129 JPP((j_decompress_ptr cinfo, int marker_code, 1130 jpeg_marker_parser_method routine)); 1131 1132 /* Read or write raw DCT coefficients --- useful for lossless transcoding. */ 1133 EXTERN(jvirt_barray_ptr *) jpeg_read_coefficients JPP((j_decompress_ptr cinfo)); 1134 EXTERN(void) jpeg_write_coefficients JPP((j_compress_ptr cinfo, 1135 jvirt_barray_ptr * coef_arrays)); 1136 EXTERN(void) jpeg_copy_critical_parameters JPP((j_decompress_ptr srcinfo, 1137 j_compress_ptr dstinfo)); 1138 1139 /* If you choose to abort compression or decompression before completing 1140 * jpeg_finish_(de)compress, then you need to clean up to release memory, 1141 * temporary files, etc. You can just call jpeg_destroy_(de)compress 1142 * if you're done with the JPEG object, but if you want to clean it up and 1143 * reuse it, call this: 1144 */ 1145 EXTERN(void) jpeg_abort_compress JPP((j_compress_ptr cinfo)); 1146 EXTERN(void) jpeg_abort_decompress JPP((j_decompress_ptr cinfo)); 1147 1148 /* Generic versions of jpeg_abort and jpeg_destroy that work on either 1149 * flavor of JPEG object. These may be more convenient in some places. 1150 */ 1151 EXTERN(void) jpeg_abort JPP((j_common_ptr cinfo)); 1152 EXTERN(void) jpeg_destroy JPP((j_common_ptr cinfo)); 1153 1154 /* Default restart-marker-resync procedure for use by data source modules */ 1155 EXTERN(boolean) jpeg_resync_to_restart JPP((j_decompress_ptr cinfo, 1156 int desired)); 1157 1158 1159 /* These marker codes are exported since applications and data source modules 1160 * are likely to want to use them. 1161 */ 1162 1163 #define JPEG_RST0 0xD0 /* RST0 marker code */ 1164 #define JPEG_EOI 0xD9 /* EOI marker code */ 1165 #define JPEG_APP0 0xE0 /* APP0 marker code */ 1166 #define JPEG_COM 0xFE /* COM marker code */ 1167 1168 1169 /* If we have a brain-damaged compiler that emits warnings (or worse, errors) 1170 * for structure definitions that are never filled in, keep it quiet by 1171 * supplying dummy definitions for the various substructures. 1172 */ 1173 1174 #ifdef INCOMPLETE_TYPES_BROKEN 1175 #ifndef JPEG_INTERNALS /* will be defined in jpegint.h */ 1176 struct jvirt_sarray_control { long dummy; }; 1177 struct jvirt_barray_control { long dummy; }; 1178 struct jpeg_comp_master { long dummy; }; 1179 struct jpeg_c_main_controller { long dummy; }; 1180 struct jpeg_c_prep_controller { long dummy; }; 1181 struct jpeg_c_coef_controller { long dummy; }; 1182 struct jpeg_marker_writer { long dummy; }; 1183 struct jpeg_color_converter { long dummy; }; 1184 struct jpeg_downsampler { long dummy; }; 1185 struct jpeg_forward_dct { long dummy; }; 1186 struct jpeg_entropy_encoder { long dummy; }; 1187 struct jpeg_decomp_master { long dummy; }; 1188 struct jpeg_d_main_controller { long dummy; }; 1189 struct jpeg_d_coef_controller { long dummy; }; 1190 struct jpeg_d_post_controller { long dummy; }; 1191 struct jpeg_input_controller { long dummy; }; 1192 struct jpeg_marker_reader { long dummy; }; 1193 struct jpeg_entropy_decoder { long dummy; }; 1194 struct jpeg_inverse_dct { long dummy; }; 1195 struct jpeg_upsampler { long dummy; }; 1196 struct jpeg_color_deconverter { long dummy; }; 1197 struct jpeg_color_quantizer { long dummy; }; 1198 #endif /* JPEG_INTERNALS */ 1199 #endif /* INCOMPLETE_TYPES_BROKEN */ 1200 1201 1202 /* 1203 * The JPEG library modules define JPEG_INTERNALS before including this file. 1204 * The internal structure declarations are read only when that is true. 1205 * Applications using the library should not include jpegint.h, but may wish 1206 * to include jerror.h. 1207 */ 1208 1209 #ifdef JPEG_INTERNALS 1210 #include "jpegint16.h" /* fetch private declarations */ 1211 #include "jerror16.h" /* fetch error codes too */ 1212 #endif 1213 1214 #endif /* JPEGLIB_H */ 1215