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