jpeglib.h (44044B)
1 /* 2 * jpeglib.h 3 * 4 * Copyright (C) 1991-1995, 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 typedef unsigned char boolean; 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 "../jpeg-6/jconfig.h" /* widely used configuration options */ 26 #endif 27 #include "../jpeg-6/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 60 /* Version 6 */ 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 /* This macro is used to declare a "method", that is, a function pointer. 63 * We want to supply prototype parameters if the compiler can cope. 64 * Note that the arglist parameter must be parenthesized! 65 */ 66 67 #ifdef HAVE_PROTOTYPES 68 #define JMETHOD(type,methodname,arglist) type (*methodname) arglist 69 #else 70 #define JMETHOD(type,methodname,arglist) type (*methodname) () 71 #endif 72 73 74 /* Data structures for images (arrays of samples and of DCT coefficients). 75 * On 80x86 machines, the image arrays are too big for near pointers, 76 * but the pointer arrays can fit in near memory. 77 */ 78 79 typedef JSAMPLE FAR *JSAMPROW; /* ptr to one image row of pixel samples. */ 80 typedef JSAMPROW *JSAMPARRAY; /* ptr to some rows (a 2-D sample array) */ 81 typedef JSAMPARRAY *JSAMPIMAGE; /* a 3-D sample array: top index is color */ 82 83 typedef JCOEF JBLOCK[DCTSIZE2]; /* one block of coefficients */ 84 typedef JBLOCK FAR *JBLOCKROW; /* pointer to one row of coefficient blocks */ 85 typedef JBLOCKROW *JBLOCKARRAY; /* a 2-D array of coefficient blocks */ 86 typedef JBLOCKARRAY *JBLOCKIMAGE; /* a 3-D array of coefficient blocks */ 87 88 typedef JCOEF FAR *JCOEFPTR; /* useful in a couple of places */ 89 90 91 /* Types for JPEG compression parameters and working tables. */ 92 93 94 /* DCT coefficient quantization tables. */ 95 96 typedef struct { 97 /* This field directly represents the contents of a JPEG DQT marker. 98 * Note: the values are always given in zigzag order. 99 */ 100 UINT16 quantval[DCTSIZE2]; /* quantization step for each coefficient */ 101 /* This field is used only during compression. It's initialized FALSE when 102 * the table is created, and set TRUE when it's been output to the file. 103 * You could suppress output of a table by setting this to TRUE. 104 * (See jpeg_suppress_tables for an example.) 105 */ 106 boolean sent_table; /* TRUE when table has been output */ 107 } JQUANT_TBL; 108 109 110 /* Huffman coding tables. */ 111 112 typedef struct { 113 /* These two fields directly represent the contents of a JPEG DHT marker */ 114 UINT8 bits[17]; /* bits[k] = # of symbols with codes of */ 115 /* length k bits; bits[0] is unused */ 116 UINT8 huffval[256]; /* The symbols, in order of incr code length */ 117 /* This field is used only during compression. It's initialized FALSE when 118 * the table is created, and set TRUE when it's been output to the file. 119 * You could suppress output of a table by setting this to TRUE. 120 * (See jpeg_suppress_tables for an example.) 121 */ 122 boolean sent_table; /* TRUE when table has been output */ 123 } JHUFF_TBL; 124 125 126 /* Basic info about one component (color channel). */ 127 128 typedef struct { 129 /* These values are fixed over the whole image. */ 130 /* For compression, they must be supplied by parameter setup; */ 131 /* for decompression, they are read from the SOF marker. */ 132 int component_id; /* identifier for this component (0..255) */ 133 int component_index; /* its index in SOF or cinfo->comp_info[] */ 134 int h_samp_factor; /* horizontal sampling factor (1..4) */ 135 int v_samp_factor; /* vertical sampling factor (1..4) */ 136 int quant_tbl_no; /* quantization table selector (0..3) */ 137 /* These values may vary between scans. */ 138 /* For compression, they must be supplied by parameter setup; */ 139 /* for decompression, they are read from the SOS marker. */ 140 /* The decompressor output side may not use these variables. */ 141 int dc_tbl_no; /* DC entropy table selector (0..3) */ 142 int ac_tbl_no; /* AC entropy table selector (0..3) */ 143 144 /* Remaining fields should be treated as private by applications. */ 145 146 /* These values are computed during compression or decompression startup: */ 147 /* Component's size in DCT blocks. 148 * Any dummy blocks added to complete an MCU are not counted; therefore 149 * these values do not depend on whether a scan is interleaved or not. 150 */ 151 JDIMENSION width_in_blocks; 152 JDIMENSION height_in_blocks; 153 /* Size of a DCT block in samples. Always DCTSIZE for compression. 154 * For decompression this is the size of the output from one DCT block, 155 * reflecting any scaling we choose to apply during the IDCT step. 156 * Values of 1,2,4,8 are likely to be supported. Note that different 157 * components may receive different IDCT scalings. 158 */ 159 int DCT_scaled_size; 160 /* The downsampled dimensions are the component's actual, unpadded number 161 * of samples at the main buffer (preprocessing/compression interface), thus 162 * downsampled_width = ceil(image_width * Hi/Hmax) 163 * and similarly for height. For decompression, IDCT scaling is included, so 164 * downsampled_width = ceil(image_width * Hi/Hmax * DCT_scaled_size/DCTSIZE) 165 */ 166 JDIMENSION downsampled_width; /* actual width in samples */ 167 JDIMENSION downsampled_height; /* actual height in samples */ 168 /* This flag is used only for decompression. In cases where some of the 169 * components will be ignored (eg grayscale output from YCbCr image), 170 * we can skip most computations for the unused components. 171 */ 172 boolean component_needed; /* do we need the value of this component? */ 173 174 /* These values are computed before starting a scan of the component. */ 175 /* The decompressor output side may not use these variables. */ 176 int MCU_width; /* number of blocks per MCU, horizontally */ 177 int MCU_height; /* number of blocks per MCU, vertically */ 178 int MCU_blocks; /* MCU_width * MCU_height */ 179 int MCU_sample_width; /* MCU width in samples, MCU_width*DCT_scaled_size */ 180 int last_col_width; /* # of non-dummy blocks across in last MCU */ 181 int last_row_height; /* # of non-dummy blocks down in last MCU */ 182 183 /* Saved quantization table for component; NULL if none yet saved. 184 * See jdinput.c comments about the need for this information. 185 * This field is not currently used by the compressor. 186 */ 187 JQUANT_TBL * quant_table; 188 189 /* Private per-component storage for DCT or IDCT subsystem. */ 190 void * dct_table; 191 } jpeg_component_info; 192 193 194 /* The script for encoding a multiple-scan file is an array of these: */ 195 196 typedef struct { 197 int comps_in_scan; /* number of components encoded in this scan */ 198 int component_index[MAX_COMPS_IN_SCAN]; /* their SOF/comp_info[] indexes */ 199 int Ss, Se; /* progressive JPEG spectral selection parms */ 200 int Ah, Al; /* progressive JPEG successive approx. parms */ 201 } jpeg_scan_info; 202 203 204 /* Known color spaces. */ 205 206 typedef enum { 207 JCS_UNKNOWN, /* error/unspecified */ 208 JCS_GRAYSCALE, /* monochrome */ 209 JCS_RGB, /* red/green/blue */ 210 JCS_YCbCr, /* Y/Cb/Cr (also known as YUV) */ 211 JCS_CMYK, /* C/M/Y/K */ 212 JCS_YCCK /* Y/Cb/Cr/K */ 213 } J_COLOR_SPACE; 214 215 /* DCT/IDCT algorithm options. */ 216 217 typedef enum { 218 JDCT_ISLOW, /* slow but accurate integer algorithm */ 219 JDCT_IFAST, /* faster, less accurate integer method */ 220 JDCT_FLOAT /* floating-point: accurate, fast on fast HW */ 221 } J_DCT_METHOD; 222 223 #ifndef JDCT_DEFAULT /* may be overridden in jconfig.h */ 224 #define JDCT_DEFAULT JDCT_ISLOW 225 #endif 226 #ifndef JDCT_FASTEST /* may be overridden in jconfig.h */ 227 #define JDCT_FASTEST JDCT_IFAST 228 #endif 229 230 /* Dithering options for decompression. */ 231 232 typedef enum { 233 JDITHER_NONE, /* no dithering */ 234 JDITHER_ORDERED, /* simple ordered dither */ 235 JDITHER_FS /* Floyd-Steinberg error diffusion dither */ 236 } J_DITHER_MODE; 237 238 239 /* Common fields between JPEG compression and decompression master structs. */ 240 241 #define jpeg_common_fields \ 242 struct jpeg_error_mgr * err; /* Error handler module */\ 243 struct jpeg_memory_mgr * mem; /* Memory manager module */\ 244 struct jpeg_progress_mgr * progress; /* Progress monitor, or NULL if none */\ 245 boolean is_decompressor; /* so common code can tell which is which */\ 246 int global_state /* for checking call sequence validity */ 247 248 /* Routines that are to be used by both halves of the library are declared 249 * to receive a pointer to this structure. There are no actual instances of 250 * jpeg_common_struct, only of jpeg_compress_struct and jpeg_decompress_struct. 251 */ 252 struct jpeg_common_struct { 253 jpeg_common_fields; /* Fields common to both master struct types */ 254 /* Additional fields follow in an actual jpeg_compress_struct or 255 * jpeg_decompress_struct. All three structs must agree on these 256 * initial fields! (This would be a lot cleaner in C++.) 257 */ 258 }; 259 260 typedef struct jpeg_common_struct * j_common_ptr; 261 typedef struct jpeg_compress_struct * j_compress_ptr; 262 typedef struct jpeg_decompress_struct * j_decompress_ptr; 263 264 265 /* Master record for a compression instance */ 266 267 struct jpeg_compress_struct { 268 jpeg_common_fields; /* Fields shared with jpeg_decompress_struct */ 269 270 /* Destination for compressed data */ 271 struct jpeg_destination_mgr * dest; 272 273 /* Description of source image --- these fields must be filled in by 274 * outer application before starting compression. in_color_space must 275 * be correct before you can even call jpeg_set_defaults(). 276 */ 277 278 JDIMENSION image_width; /* input image width */ 279 JDIMENSION image_height; /* input image height */ 280 int input_components; /* # of color components in input image */ 281 J_COLOR_SPACE in_color_space; /* colorspace of input image */ 282 283 double input_gamma; /* image gamma of input image */ 284 285 /* Compression parameters --- these fields must be set before calling 286 * jpeg_start_compress(). We recommend calling jpeg_set_defaults() to 287 * initialize everything to reasonable defaults, then changing anything 288 * the application specifically wants to change. That way you won't get 289 * burnt when new parameters are added. Also note that there are several 290 * helper routines to simplify changing parameters. 291 */ 292 293 int data_precision; /* bits of precision in image data */ 294 295 int num_components; /* # of color components in JPEG image */ 296 J_COLOR_SPACE jpeg_color_space; /* colorspace of JPEG image */ 297 298 jpeg_component_info * comp_info; 299 /* comp_info[i] describes component that appears i'th in SOF */ 300 301 JQUANT_TBL * quant_tbl_ptrs[NUM_QUANT_TBLS]; 302 /* ptrs to coefficient quantization tables, or NULL if not defined */ 303 304 JHUFF_TBL * dc_huff_tbl_ptrs[NUM_HUFF_TBLS]; 305 JHUFF_TBL * ac_huff_tbl_ptrs[NUM_HUFF_TBLS]; 306 /* ptrs to Huffman coding tables, or NULL if not defined */ 307 308 UINT8 arith_dc_L[NUM_ARITH_TBLS]; /* L values for DC arith-coding tables */ 309 UINT8 arith_dc_U[NUM_ARITH_TBLS]; /* U values for DC arith-coding tables */ 310 UINT8 arith_ac_K[NUM_ARITH_TBLS]; /* Kx values for AC arith-coding tables */ 311 312 int num_scans; /* # of entries in scan_info array */ 313 const jpeg_scan_info * scan_info; /* script for multi-scan file, or NULL */ 314 /* The default value of scan_info is NULL, which causes a single-scan 315 * sequential JPEG file to be emitted. To create a multi-scan file, 316 * set num_scans and scan_info to point to an array of scan definitions. 317 */ 318 319 boolean raw_data_in; /* TRUE=caller supplies downsampled data */ 320 boolean arith_code; /* TRUE=arithmetic coding, FALSE=Huffman */ 321 boolean optimize_coding; /* TRUE=optimize entropy encoding parms */ 322 boolean CCIR601_sampling; /* TRUE=first samples are cosited */ 323 int smoothing_factor; /* 1..100, or 0 for no input smoothing */ 324 J_DCT_METHOD dct_method; /* DCT algorithm selector */ 325 326 /* The restart interval can be specified in absolute MCUs by setting 327 * restart_interval, or in MCU rows by setting restart_in_rows 328 * (in which case the correct restart_interval will be figured 329 * for each scan). 330 */ 331 unsigned int restart_interval; /* MCUs per restart, or 0 for no restart */ 332 int restart_in_rows; /* if > 0, MCU rows per restart interval */ 333 334 /* Parameters controlling emission of special markers. */ 335 336 boolean write_JFIF_header; /* should a JFIF marker be written? */ 337 /* These three values are not used by the JPEG code, merely copied */ 338 /* into the JFIF APP0 marker. density_unit can be 0 for unknown, */ 339 /* 1 for dots/inch, or 2 for dots/cm. Note that the pixel aspect */ 340 /* ratio is defined by X_density/Y_density even when density_unit=0. */ 341 UINT8 density_unit; /* JFIF code for pixel size units */ 342 UINT16 X_density; /* Horizontal pixel density */ 343 UINT16 Y_density; /* Vertical pixel density */ 344 boolean write_Adobe_marker; /* should an Adobe marker be written? */ 345 346 /* State variable: index of next scanline to be written to 347 * jpeg_write_scanlines(). Application may use this to control its 348 * processing loop, e.g., "while (next_scanline < image_height)". 349 */ 350 351 JDIMENSION next_scanline; /* 0 .. image_height-1 */ 352 353 /* Remaining fields are known throughout compressor, but generally 354 * should not be touched by a surrounding application. 355 */ 356 357 /* 358 * These fields are computed during compression startup 359 */ 360 boolean progressive_mode; /* TRUE if scan script uses progressive mode */ 361 int max_h_samp_factor; /* largest h_samp_factor */ 362 int max_v_samp_factor; /* largest v_samp_factor */ 363 364 JDIMENSION total_iMCU_rows; /* # of iMCU rows to be input to coef ctlr */ 365 /* The coefficient controller receives data in units of MCU rows as defined 366 * for fully interleaved scans (whether the JPEG file is interleaved or not). 367 * There are v_samp_factor * DCTSIZE sample rows of each component in an 368 * "iMCU" (interleaved MCU) row. 369 */ 370 371 /* 372 * These fields are valid during any one scan. 373 * They describe the components and MCUs actually appearing in the scan. 374 */ 375 int comps_in_scan; /* # of JPEG components in this scan */ 376 jpeg_component_info * cur_comp_info[MAX_COMPS_IN_SCAN]; 377 /* *cur_comp_info[i] describes component that appears i'th in SOS */ 378 379 JDIMENSION MCUs_per_row; /* # of MCUs across the image */ 380 JDIMENSION MCU_rows_in_scan; /* # of MCU rows in the image */ 381 382 int blocks_in_MCU; /* # of DCT blocks per MCU */ 383 int MCU_membership[C_MAX_BLOCKS_IN_MCU]; 384 /* MCU_membership[i] is index in cur_comp_info of component owning */ 385 /* i'th block in an MCU */ 386 387 int Ss, Se, Ah, Al; /* progressive JPEG parameters for scan */ 388 389 /* 390 * Links to compression subobjects (methods and private variables of modules) 391 */ 392 struct jpeg_comp_master * master; 393 struct jpeg_c_main_controller * main; 394 struct jpeg_c_prep_controller * prep; 395 struct jpeg_c_coef_controller * coef; 396 struct jpeg_marker_writer * marker; 397 struct jpeg_color_converter * cconvert; 398 struct jpeg_downsampler * downsample; 399 struct jpeg_forward_dct * fdct; 400 struct jpeg_entropy_encoder * entropy; 401 }; 402 403 404 /* Master record for a decompression instance */ 405 406 struct jpeg_decompress_struct { 407 jpeg_common_fields; /* Fields shared with jpeg_compress_struct */ 408 409 /* Source of compressed data */ 410 struct jpeg_source_mgr * src; 411 412 /* Basic description of image --- filled in by jpeg_read_header(). */ 413 /* Application may inspect these values to decide how to process image. */ 414 415 JDIMENSION image_width; /* nominal image width (from SOF marker) */ 416 JDIMENSION image_height; /* nominal image height */ 417 int num_components; /* # of color components in JPEG image */ 418 J_COLOR_SPACE jpeg_color_space; /* colorspace of JPEG image */ 419 420 /* Decompression processing parameters --- these fields must be set before 421 * calling jpeg_start_decompress(). Note that jpeg_read_header() initializes 422 * them to default values. 423 */ 424 425 J_COLOR_SPACE out_color_space; /* colorspace for output */ 426 427 unsigned int scale_num, scale_denom; /* fraction by which to scale image */ 428 429 double output_gamma; /* image gamma wanted in output */ 430 431 boolean buffered_image; /* TRUE=multiple output passes */ 432 boolean raw_data_out; /* TRUE=downsampled data wanted */ 433 434 J_DCT_METHOD dct_method; /* IDCT algorithm selector */ 435 boolean do_fancy_upsampling; /* TRUE=apply fancy upsampling */ 436 boolean do_block_smoothing; /* TRUE=apply interblock smoothing */ 437 438 boolean quantize_colors; /* TRUE=colormapped output wanted */ 439 /* the following are ignored if not quantize_colors: */ 440 J_DITHER_MODE dither_mode; /* type of color dithering to use */ 441 boolean two_pass_quantize; /* TRUE=use two-pass color quantization */ 442 int desired_number_of_colors; /* max # colors to use in created colormap */ 443 /* these are significant only in buffered-image mode: */ 444 boolean enable_1pass_quant; /* enable future use of 1-pass quantizer */ 445 boolean enable_external_quant;/* enable future use of external colormap */ 446 boolean enable_2pass_quant; /* enable future use of 2-pass quantizer */ 447 448 /* Description of actual output image that will be returned to application. 449 * These fields are computed by jpeg_start_decompress(). 450 * You can also use jpeg_calc_output_dimensions() to determine these values 451 * in advance of calling jpeg_start_decompress(). 452 */ 453 454 JDIMENSION output_width; /* scaled image width */ 455 JDIMENSION output_height; /* scaled image height */ 456 int out_color_components; /* # of color components in out_color_space */ 457 int output_components; /* # of color components returned */ 458 /* output_components is 1 (a colormap index) when quantizing colors; 459 * otherwise it equals out_color_components. 460 */ 461 int rec_outbuf_height; /* min recommended height of scanline buffer */ 462 /* If the buffer passed to jpeg_read_scanlines() is less than this many rows 463 * high, space and time will be wasted due to unnecessary data copying. 464 * Usually rec_outbuf_height will be 1 or 2, at most 4. 465 */ 466 467 /* When quantizing colors, the output colormap is described by these fields. 468 * The application can supply a colormap by setting colormap non-NULL before 469 * calling jpeg_start_decompress; otherwise a colormap is created during 470 * jpeg_start_decompress or jpeg_start_output. 471 * The map has out_color_components rows and actual_number_of_colors columns. 472 */ 473 int actual_number_of_colors; /* number of entries in use */ 474 JSAMPARRAY colormap; /* The color map as a 2-D pixel array */ 475 476 /* State variables: these variables indicate the progress of decompression. 477 * The application may examine these but must not modify them. 478 */ 479 480 /* Row index of next scanline to be read from jpeg_read_scanlines(). 481 * Application may use this to control its processing loop, e.g., 482 * "while (output_scanline < output_height)". 483 */ 484 JDIMENSION output_scanline; /* 0 .. output_height-1 */ 485 486 /* Current input scan number and number of iMCU rows completed in scan. 487 * These indicate the progress of the decompressor input side. 488 */ 489 int input_scan_number; /* Number of SOS markers seen so far */ 490 JDIMENSION input_iMCU_row; /* Number of iMCU rows completed */ 491 492 /* The "output scan number" is the notional scan being displayed by the 493 * output side. The decompressor will not allow output scan/row number 494 * to get ahead of input scan/row, but it can fall arbitrarily far behind. 495 */ 496 int output_scan_number; /* Nominal scan number being displayed */ 497 JDIMENSION output_iMCU_row; /* Number of iMCU rows read */ 498 499 /* Current progression status. coef_bits[c][i] indicates the precision 500 * with which component c's DCT coefficient i (in zigzag order) is known. 501 * It is -1 when no data has yet been received, otherwise it is the point 502 * transform (shift) value for the most recent scan of the coefficient 503 * (thus, 0 at completion of the progression). 504 * This pointer is NULL when reading a non-progressive file. 505 */ 506 int (*coef_bits)[DCTSIZE2]; /* -1 or current Al value for each coef */ 507 508 /* Internal JPEG parameters --- the application usually need not look at 509 * these fields. Note that the decompressor output side may not use 510 * any parameters that can change between scans. 511 */ 512 513 /* Quantization and Huffman tables are carried forward across input 514 * datastreams when processing abbreviated JPEG datastreams. 515 */ 516 517 JQUANT_TBL * quant_tbl_ptrs[NUM_QUANT_TBLS]; 518 /* ptrs to coefficient quantization tables, or NULL if not defined */ 519 520 JHUFF_TBL * dc_huff_tbl_ptrs[NUM_HUFF_TBLS]; 521 JHUFF_TBL * ac_huff_tbl_ptrs[NUM_HUFF_TBLS]; 522 /* ptrs to Huffman coding tables, or NULL if not defined */ 523 524 /* These parameters are never carried across datastreams, since they 525 * are given in SOF/SOS markers or defined to be reset by SOI. 526 */ 527 528 int data_precision; /* bits of precision in image data */ 529 530 jpeg_component_info * comp_info; 531 /* comp_info[i] describes component that appears i'th in SOF */ 532 533 boolean progressive_mode; /* TRUE if SOFn specifies progressive mode */ 534 boolean arith_code; /* TRUE=arithmetic coding, FALSE=Huffman */ 535 536 UINT8 arith_dc_L[NUM_ARITH_TBLS]; /* L values for DC arith-coding tables */ 537 UINT8 arith_dc_U[NUM_ARITH_TBLS]; /* U values for DC arith-coding tables */ 538 UINT8 arith_ac_K[NUM_ARITH_TBLS]; /* Kx values for AC arith-coding tables */ 539 540 unsigned int restart_interval; /* MCUs per restart interval, or 0 for no restart */ 541 542 /* These fields record data obtained from optional markers recognized by 543 * the JPEG library. 544 */ 545 boolean saw_JFIF_marker; /* TRUE iff a JFIF APP0 marker was found */ 546 /* Data copied from JFIF marker: */ 547 UINT8 density_unit; /* JFIF code for pixel size units */ 548 UINT16 X_density; /* Horizontal pixel density */ 549 UINT16 Y_density; /* Vertical pixel density */ 550 boolean saw_Adobe_marker; /* TRUE iff an Adobe APP14 marker was found */ 551 UINT8 Adobe_transform; /* Color transform code from Adobe marker */ 552 553 boolean CCIR601_sampling; /* TRUE=first samples are cosited */ 554 555 /* Remaining fields are known throughout decompressor, but generally 556 * should not be touched by a surrounding application. 557 */ 558 559 /* 560 * These fields are computed during decompression startup 561 */ 562 int max_h_samp_factor; /* largest h_samp_factor */ 563 int max_v_samp_factor; /* largest v_samp_factor */ 564 565 int min_DCT_scaled_size; /* smallest DCT_scaled_size of any component */ 566 567 JDIMENSION total_iMCU_rows; /* # of iMCU rows in image */ 568 /* The coefficient controller's input and output progress is measured in 569 * units of "iMCU" (interleaved MCU) rows. These are the same as MCU rows 570 * in fully interleaved JPEG scans, but are used whether the scan is 571 * interleaved or not. We define an iMCU row as v_samp_factor DCT block 572 * rows of each component. Therefore, the IDCT output contains 573 * v_samp_factor*DCT_scaled_size sample rows of a component per iMCU row. 574 */ 575 576 JSAMPLE * sample_range_limit; /* table for fast range-limiting */ 577 578 /* 579 * These fields are valid during any one scan. 580 * They describe the components and MCUs actually appearing in the scan. 581 * Note that the decompressor output side must not use these fields. 582 */ 583 int comps_in_scan; /* # of JPEG components in this scan */ 584 jpeg_component_info * cur_comp_info[MAX_COMPS_IN_SCAN]; 585 /* *cur_comp_info[i] describes component that appears i'th in SOS */ 586 587 JDIMENSION MCUs_per_row; /* # of MCUs across the image */ 588 JDIMENSION MCU_rows_in_scan; /* # of MCU rows in the image */ 589 590 int blocks_in_MCU; /* # of DCT blocks per MCU */ 591 int MCU_membership[D_MAX_BLOCKS_IN_MCU]; 592 /* MCU_membership[i] is index in cur_comp_info of component owning */ 593 /* i'th block in an MCU */ 594 595 int Ss, Se, Ah, Al; /* progressive JPEG parameters for scan */ 596 597 /* This field is shared between entropy decoder and marker parser. 598 * It is either zero or the code of a JPEG marker that has been 599 * read from the data source, but has not yet been processed. 600 */ 601 int unread_marker; 602 603 /* 604 * Links to decompression subobjects (methods, private variables of modules) 605 */ 606 struct jpeg_decomp_master * master; 607 struct jpeg_d_main_controller * main; 608 struct jpeg_d_coef_controller * coef; 609 struct jpeg_d_post_controller * post; 610 struct jpeg_input_controller * inputctl; 611 struct jpeg_marker_reader * marker; 612 struct jpeg_entropy_decoder * entropy; 613 struct jpeg_inverse_dct * idct; 614 struct jpeg_upsampler * upsample; 615 struct jpeg_color_deconverter * cconvert; 616 struct jpeg_color_quantizer * cquantize; 617 }; 618 619 620 /* "Object" declarations for JPEG modules that may be supplied or called 621 * directly by the surrounding application. 622 * As with all objects in the JPEG library, these structs only define the 623 * publicly visible methods and state variables of a module. Additional 624 * private fields may exist after the public ones. 625 */ 626 627 628 /* Error handler object */ 629 630 struct jpeg_error_mgr { 631 /* Error exit handler: does not return to caller */ 632 JMETHOD(void, error_exit, (j_common_ptr cinfo)); 633 /* Conditionally emit a trace or warning message */ 634 JMETHOD(void, emit_message, (j_common_ptr cinfo, int msg_level)); 635 /* Routine that actually outputs a trace or error message */ 636 JMETHOD(void, output_message, (j_common_ptr cinfo)); 637 /* Format a message string for the most recent JPEG error or message */ 638 JMETHOD(void, format_message, (j_common_ptr cinfo, char * buffer)); 639 #define JMSG_LENGTH_MAX 200 /* recommended size of format_message buffer */ 640 /* Reset error state variables at start of a new image */ 641 JMETHOD(void, reset_error_mgr, (j_common_ptr cinfo)); 642 643 /* The message ID code and any parameters are saved here. 644 * A message can have one string parameter or up to 8 int parameters. 645 */ 646 int msg_code; 647 #define JMSG_STR_PARM_MAX 80 648 union { 649 int i[8]; 650 char s[JMSG_STR_PARM_MAX]; 651 } msg_parm; 652 653 /* Standard state variables for error facility */ 654 655 int trace_level; /* max msg_level that will be displayed */ 656 657 /* For recoverable corrupt-data errors, we emit a warning message, 658 * but keep going unless emit_message chooses to abort. emit_message 659 * should count warnings in num_warnings. The surrounding application 660 * can check for bad data by seeing if num_warnings is nonzero at the 661 * end of processing. 662 */ 663 long num_warnings; /* number of corrupt-data warnings */ 664 665 /* These fields point to the table(s) of error message strings. 666 * An application can change the table pointer to switch to a different 667 * message list (typically, to change the language in which errors are 668 * reported). Some applications may wish to add additional error codes 669 * that will be handled by the JPEG library error mechanism; the second 670 * table pointer is used for this purpose. 671 * 672 * First table includes all errors generated by JPEG library itself. 673 * Error code 0 is reserved for a "no such error string" message. 674 */ 675 const char * const * jpeg_message_table; /* Library errors */ 676 int last_jpeg_message; /* Table contains strings 0..last_jpeg_message */ 677 /* Second table can be added by application (see cjpeg/djpeg for example). 678 * It contains strings numbered first_addon_message..last_addon_message. 679 */ 680 const char * const * addon_message_table; /* Non-library errors */ 681 int first_addon_message; /* code for first string in addon table */ 682 int last_addon_message; /* code for last string in addon table */ 683 }; 684 685 686 /* Progress monitor object */ 687 688 struct jpeg_progress_mgr { 689 JMETHOD(void, progress_monitor, (j_common_ptr cinfo)); 690 691 long pass_counter; /* work units completed in this pass */ 692 long pass_limit; /* total number of work units in this pass */ 693 int completed_passes; /* passes completed so far */ 694 int total_passes; /* total number of passes expected */ 695 }; 696 697 698 /* Data destination object for compression */ 699 700 struct jpeg_destination_mgr { 701 JOCTET * next_output_byte; /* => next byte to write in buffer */ 702 size_t free_in_buffer; /* # of byte spaces remaining in buffer */ 703 704 JMETHOD(void, init_destination, (j_compress_ptr cinfo)); 705 JMETHOD(boolean, empty_output_buffer, (j_compress_ptr cinfo)); 706 JMETHOD(void, term_destination, (j_compress_ptr cinfo)); 707 }; 708 709 710 /* Data source object for decompression */ 711 712 struct jpeg_source_mgr { 713 const JOCTET * next_input_byte; /* => next byte to read from buffer */ 714 size_t bytes_in_buffer; /* # of bytes remaining in buffer */ 715 716 JMETHOD(void, init_source, (j_decompress_ptr cinfo)); 717 JMETHOD(boolean, fill_input_buffer, (j_decompress_ptr cinfo)); 718 JMETHOD(void, skip_input_data, (j_decompress_ptr cinfo, long num_bytes)); 719 JMETHOD(boolean, resync_to_restart, (j_decompress_ptr cinfo, int desired)); 720 JMETHOD(void, term_source, (j_decompress_ptr cinfo)); 721 }; 722 723 724 /* Memory manager object. 725 * Allocates "small" objects (a few K total), "large" objects (tens of K), 726 * and "really big" objects (virtual arrays with backing store if needed). 727 * The memory manager does not allow individual objects to be freed; rather, 728 * each created object is assigned to a pool, and whole pools can be freed 729 * at once. This is faster and more convenient than remembering exactly what 730 * to free, especially where malloc()/free() are not too speedy. 731 * NB: alloc routines never return NULL. They exit to error_exit if not 732 * successful. 733 */ 734 735 #define JPOOL_PERMANENT 0 /* lasts until master record is destroyed */ 736 #define JPOOL_IMAGE 1 /* lasts until done with image/datastream */ 737 #define JPOOL_NUMPOOLS 2 738 739 typedef struct jvirt_sarray_control * jvirt_sarray_ptr; 740 typedef struct jvirt_barray_control * jvirt_barray_ptr; 741 742 743 struct jpeg_memory_mgr { 744 /* Method pointers */ 745 JMETHOD(void *, alloc_small, (j_common_ptr cinfo, int pool_id, 746 size_t sizeofobject)); 747 JMETHOD(void FAR *, alloc_large, (j_common_ptr cinfo, int pool_id, 748 size_t sizeofobject)); 749 JMETHOD(JSAMPARRAY, alloc_sarray, (j_common_ptr cinfo, int pool_id, 750 JDIMENSION samplesperrow, 751 JDIMENSION numrows)); 752 JMETHOD(JBLOCKARRAY, alloc_barray, (j_common_ptr cinfo, int pool_id, 753 JDIMENSION blocksperrow, 754 JDIMENSION numrows)); 755 JMETHOD(jvirt_sarray_ptr, request_virt_sarray, (j_common_ptr cinfo, 756 int pool_id, 757 boolean pre_zero, 758 JDIMENSION samplesperrow, 759 JDIMENSION numrows, 760 JDIMENSION maxaccess)); 761 JMETHOD(jvirt_barray_ptr, request_virt_barray, (j_common_ptr cinfo, 762 int pool_id, 763 boolean pre_zero, 764 JDIMENSION blocksperrow, 765 JDIMENSION numrows, 766 JDIMENSION maxaccess)); 767 JMETHOD(void, realize_virt_arrays, (j_common_ptr cinfo)); 768 JMETHOD(JSAMPARRAY, access_virt_sarray, (j_common_ptr cinfo, 769 jvirt_sarray_ptr ptr, 770 JDIMENSION start_row, 771 JDIMENSION num_rows, 772 boolean writable)); 773 JMETHOD(JBLOCKARRAY, access_virt_barray, (j_common_ptr cinfo, 774 jvirt_barray_ptr ptr, 775 JDIMENSION start_row, 776 JDIMENSION num_rows, 777 boolean writable)); 778 JMETHOD(void, free_pool, (j_common_ptr cinfo, int pool_id)); 779 JMETHOD(void, self_destruct, (j_common_ptr cinfo)); 780 781 /* Limit on memory allocation for this JPEG object. (Note that this is 782 * merely advisory, not a guaranteed maximum; it only affects the space 783 * used for virtual-array buffers.) May be changed by outer application 784 * after creating the JPEG object. 785 */ 786 long max_memory_to_use; 787 }; 788 789 790 /* Routine signature for application-supplied marker processing methods. 791 * Need not pass marker code since it is stored in cinfo->unread_marker. 792 */ 793 typedef JMETHOD(boolean, jpeg_marker_parser_method, (j_decompress_ptr cinfo)); 794 795 796 /* Declarations for routines called by application. 797 * The JPP macro hides prototype parameters from compilers that can't cope. 798 * Note JPP requires double parentheses. 799 */ 800 801 #ifdef HAVE_PROTOTYPES 802 #define JPP(arglist) arglist 803 #else 804 #define JPP(arglist) () 805 #endif 806 807 808 /* Short forms of external names for systems with brain-damaged linkers. 809 * We shorten external names to be unique in the first six letters, which 810 * is good enough for all known systems. 811 * (If your compiler itself needs names to be unique in less than 15 812 * characters, you are out of luck. Get a better compiler.) 813 */ 814 815 #ifdef NEED_SHORT_EXTERNAL_NAMES 816 #define jpeg_std_error jStdError 817 #define jpeg_create_compress jCreaCompress 818 #define jpeg_create_decompress jCreaDecompress 819 #define jpeg_destroy_compress jDestCompress 820 #define jpeg_destroy_decompress jDestDecompress 821 #define jpeg_stdio_dest jStdDest 822 #define jpeg_stdio_src jStdSrc 823 #define jpeg_set_defaults jSetDefaults 824 #define jpeg_set_colorspace jSetColorspace 825 #define jpeg_default_colorspace jDefColorspace 826 #define jpeg_set_quality jSetQuality 827 #define jpeg_set_linear_quality jSetLQuality 828 #define jpeg_add_quant_table jAddQuantTable 829 #define jpeg_quality_scaling jQualityScaling 830 #define jpeg_simple_progression jSimProgress 831 #define jpeg_suppress_tables jSuppressTables 832 #define jpeg_alloc_quant_table jAlcQTable 833 #define jpeg_alloc_huff_table jAlcHTable 834 #define jpeg_start_compress jStrtCompress 835 #define jpeg_write_scanlines jWrtScanlines 836 #define jpeg_finish_compress jFinCompress 837 #define jpeg_write_raw_data jWrtRawData 838 #define jpeg_write_marker jWrtMarker 839 #define jpeg_write_tables jWrtTables 840 #define jpeg_read_header jReadHeader 841 #define jpeg_start_decompress jStrtDecompress 842 #define jpeg_read_scanlines jReadScanlines 843 #define jpeg_finish_decompress jFinDecompress 844 #define jpeg_read_raw_data jReadRawData 845 #define jpeg_has_multiple_scans jHasMultScn 846 #define jpeg_start_output jStrtOutput 847 #define jpeg_finish_output jFinOutput 848 #define jpeg_input_complete jInComplete 849 #define jpeg_new_colormap jNewCMap 850 #define jpeg_consume_input jConsumeInput 851 #define jpeg_calc_output_dimensions jCalcDimensions 852 #define jpeg_set_marker_processor jSetMarker 853 #define jpeg_read_coefficients jReadCoefs 854 #define jpeg_write_coefficients jWrtCoefs 855 #define jpeg_copy_critical_parameters jCopyCrit 856 #define jpeg_abort_compress jAbrtCompress 857 #define jpeg_abort_decompress jAbrtDecompress 858 #define jpeg_abort jAbort 859 #define jpeg_destroy jDestroy 860 #define jpeg_resync_to_restart jResyncRestart 861 #endif /* NEED_SHORT_EXTERNAL_NAMES */ 862 863 864 /* Default error-management setup */ 865 EXTERN struct jpeg_error_mgr *jpeg_std_error JPP((struct jpeg_error_mgr *err)); 866 867 /* Initialization and destruction of JPEG compression objects */ 868 /* NB: you must set up the error-manager BEFORE calling jpeg_create_xxx */ 869 EXTERN void jpeg_create_compress JPP((j_compress_ptr cinfo)); 870 EXTERN void jpeg_create_decompress JPP((j_decompress_ptr cinfo)); 871 EXTERN void jpeg_destroy_compress JPP((j_compress_ptr cinfo)); 872 EXTERN void jpeg_destroy_decompress JPP((j_decompress_ptr cinfo)); 873 874 /* Standard data source and destination managers: stdio streams. */ 875 /* Caller is responsible for opening the file before and closing after. */ 876 EXTERN void jpeg_stdio_dest JPP((j_compress_ptr cinfo, FILE * outfile)); 877 EXTERN void jpeg_stdio_src JPP((j_decompress_ptr cinfo, unsigned char *infile)); 878 879 /* Default parameter setup for compression */ 880 EXTERN void jpeg_set_defaults JPP((j_compress_ptr cinfo)); 881 /* Compression parameter setup aids */ 882 EXTERN void jpeg_set_colorspace JPP((j_compress_ptr cinfo, 883 J_COLOR_SPACE colorspace)); 884 EXTERN void jpeg_default_colorspace JPP((j_compress_ptr cinfo)); 885 EXTERN void jpeg_set_quality JPP((j_compress_ptr cinfo, int quality, 886 boolean force_baseline)); 887 EXTERN void jpeg_set_linear_quality JPP((j_compress_ptr cinfo, 888 int scale_factor, 889 boolean force_baseline)); 890 EXTERN void jpeg_add_quant_table JPP((j_compress_ptr cinfo, int which_tbl, 891 const unsigned int *basic_table, 892 int scale_factor, 893 boolean force_baseline)); 894 EXTERN int jpeg_quality_scaling JPP((int quality)); 895 EXTERN void jpeg_simple_progression JPP((j_compress_ptr cinfo)); 896 EXTERN void jpeg_suppress_tables JPP((j_compress_ptr cinfo, 897 boolean suppress)); 898 EXTERN JQUANT_TBL * jpeg_alloc_quant_table JPP((j_common_ptr cinfo)); 899 EXTERN JHUFF_TBL * jpeg_alloc_huff_table JPP((j_common_ptr cinfo)); 900 901 /* Main entry points for compression */ 902 EXTERN void jpeg_start_compress JPP((j_compress_ptr cinfo, 903 boolean write_all_tables)); 904 EXTERN JDIMENSION jpeg_write_scanlines JPP((j_compress_ptr cinfo, 905 JSAMPARRAY scanlines, 906 JDIMENSION num_lines)); 907 EXTERN void jpeg_finish_compress JPP((j_compress_ptr cinfo)); 908 909 /* Replaces jpeg_write_scanlines when writing raw downsampled data. */ 910 EXTERN JDIMENSION jpeg_write_raw_data JPP((j_compress_ptr cinfo, 911 JSAMPIMAGE data, 912 JDIMENSION num_lines)); 913 914 /* Write a special marker. See libjpeg.doc concerning safe usage. */ 915 EXTERN void jpeg_write_marker JPP((j_compress_ptr cinfo, int marker, 916 const JOCTET *dataptr, unsigned int datalen)); 917 918 /* Alternate compression function: just write an abbreviated table file */ 919 EXTERN void jpeg_write_tables JPP((j_compress_ptr cinfo)); 920 921 /* Decompression startup: read start of JPEG datastream to see what's there */ 922 EXTERN int jpeg_read_header JPP((j_decompress_ptr cinfo, 923 boolean require_image)); 924 /* Return value is one of: */ 925 #define JPEG_SUSPENDED 0 /* Suspended due to lack of input data */ 926 #define JPEG_HEADER_OK 1 /* Found valid image datastream */ 927 #define JPEG_HEADER_TABLES_ONLY 2 /* Found valid table-specs-only datastream */ 928 /* If you pass require_image = TRUE (normal case), you need not check for 929 * a TABLES_ONLY return code; an abbreviated file will cause an error exit. 930 * JPEG_SUSPENDED is only possible if you use a data source module that can 931 * give a suspension return (the stdio source module doesn't). 932 */ 933 934 /* Main entry points for decompression */ 935 EXTERN boolean jpeg_start_decompress JPP((j_decompress_ptr cinfo)); 936 EXTERN JDIMENSION jpeg_read_scanlines JPP((j_decompress_ptr cinfo, 937 JSAMPARRAY scanlines, 938 JDIMENSION max_lines)); 939 EXTERN boolean jpeg_finish_decompress JPP((j_decompress_ptr cinfo)); 940 941 /* Replaces jpeg_read_scanlines when reading raw downsampled data. */ 942 EXTERN JDIMENSION jpeg_read_raw_data JPP((j_decompress_ptr cinfo, 943 JSAMPIMAGE data, 944 JDIMENSION max_lines)); 945 946 /* Additional entry points for buffered-image mode. */ 947 EXTERN boolean jpeg_has_multiple_scans JPP((j_decompress_ptr cinfo)); 948 EXTERN boolean jpeg_start_output JPP((j_decompress_ptr cinfo, 949 int scan_number)); 950 EXTERN boolean jpeg_finish_output JPP((j_decompress_ptr cinfo)); 951 EXTERN boolean jpeg_input_complete JPP((j_decompress_ptr cinfo)); 952 EXTERN void jpeg_new_colormap JPP((j_decompress_ptr cinfo)); 953 EXTERN int jpeg_consume_input JPP((j_decompress_ptr cinfo)); 954 /* Return value is one of: */ 955 /* #define JPEG_SUSPENDED 0 Suspended due to lack of input data */ 956 #define JPEG_REACHED_SOS 1 /* Reached start of new scan */ 957 #define JPEG_REACHED_EOI 2 /* Reached end of image */ 958 #define JPEG_ROW_COMPLETED 3 /* Completed one iMCU row */ 959 #define JPEG_SCAN_COMPLETED 4 /* Completed last iMCU row of a scan */ 960 961 /* Precalculate output dimensions for current decompression parameters. */ 962 EXTERN void jpeg_calc_output_dimensions JPP((j_decompress_ptr cinfo)); 963 964 /* Install a special processing method for COM or APPn markers. */ 965 EXTERN void jpeg_set_marker_processor JPP((j_decompress_ptr cinfo, 966 int marker_code, 967 jpeg_marker_parser_method routine)); 968 969 /* Read or write raw DCT coefficients --- useful for lossless transcoding. */ 970 EXTERN jvirt_barray_ptr * jpeg_read_coefficients JPP((j_decompress_ptr cinfo)); 971 EXTERN void jpeg_write_coefficients JPP((j_compress_ptr cinfo, 972 jvirt_barray_ptr * coef_arrays)); 973 EXTERN void jpeg_copy_critical_parameters JPP((j_decompress_ptr srcinfo, 974 j_compress_ptr dstinfo)); 975 976 /* If you choose to abort compression or decompression before completing 977 * jpeg_finish_(de)compress, then you need to clean up to release memory, 978 * temporary files, etc. You can just call jpeg_destroy_(de)compress 979 * if you're done with the JPEG object, but if you want to clean it up and 980 * reuse it, call this: 981 */ 982 EXTERN void jpeg_abort_compress JPP((j_compress_ptr cinfo)); 983 EXTERN void jpeg_abort_decompress JPP((j_decompress_ptr cinfo)); 984 985 /* Generic versions of jpeg_abort and jpeg_destroy that work on either 986 * flavor of JPEG object. These may be more convenient in some places. 987 */ 988 EXTERN void jpeg_abort JPP((j_common_ptr cinfo)); 989 EXTERN void jpeg_destroy JPP((j_common_ptr cinfo)); 990 991 /* Default restart-marker-resync procedure for use by data source modules */ 992 EXTERN boolean jpeg_resync_to_restart JPP((j_decompress_ptr cinfo, 993 int desired)); 994 995 996 /* These marker codes are exported since applications and data source modules 997 * are likely to want to use them. 998 */ 999 1000 #define JPEG_RST0 0xD0 /* RST0 marker code */ 1001 #define JPEG_EOI 0xD9 /* EOI marker code */ 1002 #define JPEG_APP0 0xE0 /* APP0 marker code */ 1003 #define JPEG_COM 0xFE /* COM marker code */ 1004 1005 1006 /* If we have a brain-damaged compiler that emits warnings (or worse, errors) 1007 * for structure definitions that are never filled in, keep it quiet by 1008 * supplying dummy definitions for the various substructures. 1009 */ 1010 1011 #ifdef INCOMPLETE_TYPES_BROKEN 1012 #ifndef JPEG_INTERNALS /* will be defined in jpegint.h */ 1013 struct jvirt_sarray_control { long dummy; }; 1014 struct jvirt_barray_control { long dummy; }; 1015 struct jpeg_comp_master { long dummy; }; 1016 struct jpeg_c_main_controller { long dummy; }; 1017 struct jpeg_c_prep_controller { long dummy; }; 1018 struct jpeg_c_coef_controller { long dummy; }; 1019 struct jpeg_marker_writer { long dummy; }; 1020 struct jpeg_color_converter { long dummy; }; 1021 struct jpeg_downsampler { long dummy; }; 1022 struct jpeg_forward_dct { long dummy; }; 1023 struct jpeg_entropy_encoder { long dummy; }; 1024 struct jpeg_decomp_master { long dummy; }; 1025 struct jpeg_d_main_controller { long dummy; }; 1026 struct jpeg_d_coef_controller { long dummy; }; 1027 struct jpeg_d_post_controller { long dummy; }; 1028 struct jpeg_input_controller { long dummy; }; 1029 struct jpeg_marker_reader { long dummy; }; 1030 struct jpeg_entropy_decoder { long dummy; }; 1031 struct jpeg_inverse_dct { long dummy; }; 1032 struct jpeg_upsampler { long dummy; }; 1033 struct jpeg_color_deconverter { long dummy; }; 1034 struct jpeg_color_quantizer { long dummy; }; 1035 #endif /* JPEG_INTERNALS */ 1036 #endif /* INCOMPLETE_TYPES_BROKEN */ 1037 1038 1039 /* 1040 * The JPEG library modules define JPEG_INTERNALS before including this file. 1041 * The internal structure declarations are read only when that is true. 1042 * Applications using the library should not include jpegint.h, but may wish 1043 * to include jerror.h. 1044 */ 1045 1046 #ifdef JPEG_INTERNALS 1047 #include "../jpeg-6/jpegint.h" /* fetch private declarations */ 1048 #include "../jpeg-6/jerror.h" /* fetch error codes too */ 1049 #endif 1050 1051 #endif /* JPEGLIB_H */