1 #ifndef LIBRARIES_JFIF_H 2 #define LIBRARIES_JFIF_H 3 4 /* 5 6 MorphOS Shared JPEGLib 7 8 jfif.library include 9 10 Copyright © 2003-2004 The MorphOS Development Team, All Rights Reserved. 11 12 */ 13 14 #include <sys/types.h> 15 16 17 /* jconfig.h/jmorecfg.h mimic */ 18 19 20 #define BITS_IN_JSAMPLE 8 21 #define MAX_COMPONENTS 10 22 23 typedef unsigned char JSAMPLE; 24 typedef short JCOEF; 25 typedef unsigned char JOCTET; 26 typedef unsigned int JDIMENSION; 27 28 typedef unsigned char UINT8; 29 typedef unsigned short UINT16; 30 31 typedef int boolean; 32 33 34 #define GETJSAMPLE(value) ((int) (value)) 35 #define GETJOCTET(value) (value) 36 37 #define MAXJSAMPLE 255 38 #define CENTERJSAMPLE 128 39 40 #define JPEG_MAX_DIMENSION 65500L 41 42 43 #define METHODDEF(type) static type 44 #define JMETHOD(type,methodname,arglist) type (*methodname) arglist 45 46 #ifndef FAR 47 #define FAR 48 #endif 49 50 51 /* jpeglib.h mimic */ 52 53 54 #define JPEG_LIB_VERSION 62 55 56 #define DCTSIZE 8 57 #define DCTSIZE2 64 58 #define NUM_QUANT_TBLS 4 59 #define NUM_HUFF_TBLS 4 60 #define NUM_ARITH_TBLS 16 61 #define MAX_COMPS_IN_SCAN 4 62 #define MAX_SAMP_FACTOR 4 63 #define C_MAX_BLOCKS_IN_MCU 10 64 #define D_MAX_BLOCKS_IN_MCU 10 65 66 67 typedef JSAMPLE *JSAMPROW; 68 typedef JSAMPROW *JSAMPARRAY; 69 typedef JSAMPARRAY *JSAMPIMAGE; 70 71 typedef JCOEF JBLOCK[DCTSIZE2]; 72 typedef JBLOCK *JBLOCKROW; 73 typedef JBLOCKROW *JBLOCKARRAY; 74 typedef JBLOCKARRAY *JBLOCKIMAGE; 75 76 typedef JCOEF *JCOEFPTR; 77 78 79 /* DCT coefficient quantization tables. */ 80 typedef struct { 81 UINT16 quantval[DCTSIZE2]; 82 boolean sent_table; 83 } JQUANT_TBL; 84 85 86 /* Huffman coding tables. */ 87 typedef struct { 88 UINT8 bits[17]; 89 UINT8 huffval[256]; 90 boolean sent_table; 91 } JHUFF_TBL; 92 93 94 /* Basic info about one component (color channel). */ 95 typedef struct { 96 int component_id; 97 int component_index; 98 int h_samp_factor; 99 int v_samp_factor; 100 int quant_tbl_no; 101 int dc_tbl_no; 102 int ac_tbl_no; 103 JDIMENSION width_in_blocks; 104 JDIMENSION height_in_blocks; 105 int DCT_scaled_size; 106 JDIMENSION downsampled_width; 107 JDIMENSION downsampled_height; 108 boolean component_needed; 109 int MCU_width; 110 int MCU_height; 111 int MCU_blocks; 112 int MCU_sample_width; 113 int last_col_width; 114 int last_row_height; 115 JQUANT_TBL * quant_table; 116 void * dct_table; 117 } jpeg_component_info; 118 119 120 /* The script for encoding a multiple-scan file is an array of these: */ 121 typedef struct { 122 int comps_in_scan; 123 int component_index[MAX_COMPS_IN_SCAN]; 124 int Ss, Se; 125 int Ah, Al; 126 } jpeg_scan_info; 127 128 129 /* The decompressor can save APPn and COM markers in a list of these: */ 130 typedef struct jpeg_marker_struct * jpeg_saved_marker_ptr; 131 132 struct jpeg_marker_struct { 133 jpeg_saved_marker_ptr next; 134 UINT8 marker; 135 unsigned int original_length; 136 unsigned int data_length; 137 JOCTET * data; 138 }; 139 140 /* Known color spaces. */ 141 typedef enum { 142 JCS_UNKNOWN, 143 JCS_GRAYSCALE, 144 JCS_RGB, 145 JCS_YCbCr, 146 JCS_CMYK, 147 JCS_YCCK 148 } J_COLOR_SPACE; 149 150 /* DCT/IDCT algorithm options. */ 151 typedef enum { 152 JDCT_ISLOW, 153 JDCT_IFAST, 154 JDCT_FLOAT 155 } J_DCT_METHOD; 156 157 #define JDCT_DEFAULT JDCT_ISLOW 158 #define JDCT_FASTEST JDCT_IFAST 159 160 /* Dithering options for decompression. */ 161 typedef enum { 162 JDITHER_NONE, 163 JDITHER_ORDERED, 164 JDITHER_FS 165 } J_DITHER_MODE; 166 167 168 169 170 #define jpeg_common_fields \ 171 struct jpeg_error_mgr * err; \ 172 struct jpeg_memory_mgr * mem; \ 173 struct jpeg_progress_mgr * progress; \ 174 void * client_data; \ 175 boolean is_decompressor; \ 176 int global_state 177 178 typedef 179 struct jpeg_common_struct { 180 jpeg_common_fields; 181 } *j_common_ptr; 182 183 184 typedef 185 struct jpeg_compress_struct { 186 jpeg_common_fields; 187 188 struct jpeg_destination_mgr * dest; 189 190 JDIMENSION image_width; /* input image width */ 191 JDIMENSION image_height; /* input image height */ 192 int input_components; /* # of color components in input image */ 193 J_COLOR_SPACE in_color_space; /* colorspace of input image */ 194 195 double input_gamma; /* image gamma of input image */ 196 197 int data_precision; /* bits of precision in image data */ 198 199 int num_components; /* # of color components in JPEG image */ 200 J_COLOR_SPACE jpeg_color_space; /* colorspace of JPEG image */ 201 202 jpeg_component_info * comp_info; 203 204 JQUANT_TBL * quant_tbl_ptrs[NUM_QUANT_TBLS]; 205 206 JHUFF_TBL * dc_huff_tbl_ptrs[NUM_HUFF_TBLS]; 207 JHUFF_TBL * ac_huff_tbl_ptrs[NUM_HUFF_TBLS]; 208 209 UINT8 arith_dc_L[NUM_ARITH_TBLS]; /* L values for DC arith-coding tables */ 210 UINT8 arith_dc_U[NUM_ARITH_TBLS]; /* U values for DC arith-coding tables */ 211 UINT8 arith_ac_K[NUM_ARITH_TBLS]; /* Kx values for AC arith-coding tables */ 212 213 int num_scans; /* # of entries in scan_info array */ 214 const jpeg_scan_info * scan_info; /* script for multi-scan file, or NULL */ 215 216 boolean raw_data_in; /* TRUE=caller supplies downsampled data */ 217 boolean arith_code; /* TRUE=arithmetic coding, FALSE=Huffman */ 218 boolean optimize_coding; /* TRUE=optimize entropy encoding parms */ 219 boolean CCIR601_sampling; /* TRUE=first samples are cosited */ 220 int smoothing_factor; /* 1..100, or 0 for no input smoothing */ 221 J_DCT_METHOD dct_method; /* DCT algorithm selector */ 222 223 unsigned int restart_interval; /* MCUs per restart, or 0 for no restart */ 224 int restart_in_rows; /* if > 0, MCU rows per restart interval */ 225 226 boolean write_JFIF_header; /* should a JFIF marker be written? */ 227 UINT8 JFIF_major_version; /* What to write for the JFIF version number */ 228 UINT8 JFIF_minor_version; 229 230 UINT8 density_unit; /* JFIF code for pixel size units */ 231 UINT16 X_density; /* Horizontal pixel density */ 232 UINT16 Y_density; /* Vertical pixel density */ 233 boolean write_Adobe_marker; /* should an Adobe marker be written? */ 234 235 JDIMENSION next_scanline; /* 0 .. image_height-1 */ 236 237 boolean progressive_mode; /* TRUE if scan script uses progressive mode */ 238 int max_h_samp_factor; /* largest h_samp_factor */ 239 int max_v_samp_factor; /* largest v_samp_factor */ 240 241 JDIMENSION total_iMCU_rows; /* # of iMCU rows to be input to coef ctlr */ 242 243 int comps_in_scan; /* # of JPEG components in this scan */ 244 jpeg_component_info * cur_comp_info[MAX_COMPS_IN_SCAN]; 245 /* *cur_comp_info[i] describes component that appears i'th in SOS */ 246 247 JDIMENSION MCUs_per_row; /* # of MCUs across the image */ 248 JDIMENSION MCU_rows_in_scan; /* # of MCU rows in the image */ 249 250 int blocks_in_MCU; /* # of DCT blocks per MCU */ 251 int MCU_membership[C_MAX_BLOCKS_IN_MCU]; 252 253 int Ss, Se, Ah, Al; /* progressive JPEG parameters for scan */ 254 255 struct jpeg_comp_master * master; 256 struct jpeg_c_main_controller * main; 257 struct jpeg_c_prep_controller * prep; 258 struct jpeg_c_coef_controller * coef; 259 struct jpeg_marker_writer * marker; 260 struct jpeg_color_converter * cconvert; 261 struct jpeg_downsampler * downsample; 262 struct jpeg_forward_dct * fdct; 263 struct jpeg_entropy_encoder * entropy; 264 jpeg_scan_info * script_space; /* workspace for jpeg_simple_progression */ 265 int script_space_size; 266 } *j_compress_ptr; 267 268 269 /* Master record for a decompression instance */ 270 typedef 271 struct jpeg_decompress_struct { 272 jpeg_common_fields; /* Fields shared with jpeg_compress_struct */ 273 274 /* Source of compressed data */ 275 struct jpeg_source_mgr * src; 276 277 /* Basic description of image --- filled in by jpeg_read_header(). */ 278 /* Application may inspect these values to decide how to process image. */ 279 280 JDIMENSION image_width; /* nominal image width (from SOF marker) */ 281 JDIMENSION image_height; /* nominal image height */ 282 int num_components; /* # of color components in JPEG image */ 283 J_COLOR_SPACE jpeg_color_space; /* colorspace of JPEG image */ 284 285 /* Decompression processing parameters --- these fields must be set before 286 * calling jpeg_start_decompress(). Note that jpeg_read_header() initializes 287 * them to default values. 288 */ 289 290 J_COLOR_SPACE out_color_space; /* colorspace for output */ 291 292 unsigned int scale_num, scale_denom; /* fraction by which to scale image */ 293 294 double output_gamma; /* image gamma wanted in output */ 295 296 boolean buffered_image; /* TRUE=multiple output passes */ 297 boolean raw_data_out; /* TRUE=downsampled data wanted */ 298 299 J_DCT_METHOD dct_method; /* IDCT algorithm selector */ 300 boolean do_fancy_upsampling; /* TRUE=apply fancy upsampling */ 301 boolean do_block_smoothing; /* TRUE=apply interblock smoothing */ 302 303 boolean quantize_colors; /* TRUE=colormapped output wanted */ 304 /* the following are ignored if not quantize_colors: */ 305 J_DITHER_MODE dither_mode; /* type of color dithering to use */ 306 boolean two_pass_quantize; /* TRUE=use two-pass color quantization */ 307 int desired_number_of_colors; /* max # colors to use in created colormap */ 308 /* these are significant only in buffered-image mode: */ 309 boolean enable_1pass_quant; /* enable future use of 1-pass quantizer */ 310 boolean enable_external_quant;/* enable future use of external colormap */ 311 boolean enable_2pass_quant; /* enable future use of 2-pass quantizer */ 312 313 /* Description of actual output image that will be returned to application. 314 * These fields are computed by jpeg_start_decompress(). 315 * You can also use jpeg_calc_output_dimensions() to determine these values 316 * in advance of calling jpeg_start_decompress(). 317 */ 318 319 JDIMENSION output_width; /* scaled image width */ 320 JDIMENSION output_height; /* scaled image height */ 321 int out_color_components; /* # of color components in out_color_space */ 322 int output_components; /* # of color components returned */ 323 /* output_components is 1 (a colormap index) when quantizing colors; 324 * otherwise it equals out_color_components. 325 */ 326 int rec_outbuf_height; /* min recommended height of scanline buffer */ 327 /* If the buffer passed to jpeg_read_scanlines() is less than this many rows 328 * high, space and time will be wasted due to unnecessary data copying. 329 * Usually rec_outbuf_height will be 1 or 2, at most 4. 330 */ 331 332 /* When quantizing colors, the output colormap is described by these fields. 333 * The application can supply a colormap by setting colormap non-NULL before 334 * calling jpeg_start_decompress; otherwise a colormap is created during 335 * jpeg_start_decompress or jpeg_start_output. 336 * The map has out_color_components rows and actual_number_of_colors columns. 337 */ 338 int actual_number_of_colors; /* number of entries in use */ 339 JSAMPARRAY colormap; /* The color map as a 2-D pixel array */ 340 341 /* State variables: these variables indicate the progress of decompression. 342 * The application may examine these but must not modify them. 343 */ 344 345 /* Row index of next scanline to be read from jpeg_read_scanlines(). 346 * Application may use this to control its processing loop, e.g., 347 * "while (output_scanline < output_height)". 348 */ 349 JDIMENSION output_scanline; /* 0 .. output_height-1 */ 350 351 /* Current input scan number and number of iMCU rows completed in scan. 352 * These indicate the progress of the decompressor input side. 353 */ 354 int input_scan_number; /* Number of SOS markers seen so far */ 355 JDIMENSION input_iMCU_row; /* Number of iMCU rows completed */ 356 357 /* The "output scan number" is the notional scan being displayed by the 358 * output side. The decompressor will not allow output scan/row number 359 * to get ahead of input scan/row, but it can fall arbitrarily far behind. 360 */ 361 int output_scan_number; /* Nominal scan number being displayed */ 362 JDIMENSION output_iMCU_row; /* Number of iMCU rows read */ 363 364 /* Current progression status. coef_bits[c][i] indicates the precision 365 * with which component c's DCT coefficient i (in zigzag order) is known. 366 * It is -1 when no data has yet been received, otherwise it is the point 367 * transform (shift) value for the most recent scan of the coefficient 368 * (thus, 0 at completion of the progression). 369 * This pointer is NULL when reading a non-progressive file. 370 */ 371 int (*coef_bits)[DCTSIZE2]; /* -1 or current Al value for each coef */ 372 373 /* Internal JPEG parameters --- the application usually need not look at 374 * these fields. Note that the decompressor output side may not use 375 * any parameters that can change between scans. 376 */ 377 378 /* Quantization and Huffman tables are carried forward across input 379 * datastreams when processing abbreviated JPEG datastreams. 380 */ 381 382 JQUANT_TBL * quant_tbl_ptrs[NUM_QUANT_TBLS]; 383 /* ptrs to coefficient quantization tables, or NULL if not defined */ 384 385 JHUFF_TBL * dc_huff_tbl_ptrs[NUM_HUFF_TBLS]; 386 JHUFF_TBL * ac_huff_tbl_ptrs[NUM_HUFF_TBLS]; 387 /* ptrs to Huffman coding tables, or NULL if not defined */ 388 389 /* These parameters are never carried across datastreams, since they 390 * are given in SOF/SOS markers or defined to be reset by SOI. 391 */ 392 393 int data_precision; /* bits of precision in image data */ 394 395 jpeg_component_info * comp_info; 396 /* comp_info[i] describes component that appears i'th in SOF */ 397 398 boolean progressive_mode; /* TRUE if SOFn specifies progressive mode */ 399 boolean arith_code; /* TRUE=arithmetic coding, FALSE=Huffman */ 400 401 UINT8 arith_dc_L[NUM_ARITH_TBLS]; /* L values for DC arith-coding tables */ 402 UINT8 arith_dc_U[NUM_ARITH_TBLS]; /* U values for DC arith-coding tables */ 403 UINT8 arith_ac_K[NUM_ARITH_TBLS]; /* Kx values for AC arith-coding tables */ 404 405 unsigned int restart_interval; /* MCUs per restart interval, or 0 for no restart */ 406 407 /* These fields record data obtained from optional markers recognized by 408 * the JPEG library. 409 */ 410 boolean saw_JFIF_marker; /* TRUE iff a JFIF APP0 marker was found */ 411 /* Data copied from JFIF marker; only valid if saw_JFIF_marker is TRUE: */ 412 UINT8 JFIF_major_version; /* JFIF version number */ 413 UINT8 JFIF_minor_version; 414 UINT8 density_unit; /* JFIF code for pixel size units */ 415 UINT16 X_density; /* Horizontal pixel density */ 416 UINT16 Y_density; /* Vertical pixel density */ 417 boolean saw_Adobe_marker; /* TRUE iff an Adobe APP14 marker was found */ 418 UINT8 Adobe_transform; /* Color transform code from Adobe marker */ 419 420 boolean CCIR601_sampling; /* TRUE=first samples are cosited */ 421 422 /* Aside from the specific data retained from APPn markers known to the 423 * library, the uninterpreted contents of any or all APPn and COM markers 424 * can be saved in a list for examination by the application. 425 */ 426 jpeg_saved_marker_ptr marker_list; /* Head of list of saved markers */ 427 428 /* Remaining fields are known throughout decompressor, but generally 429 * should not be touched by a surrounding application. 430 */ 431 432 /* 433 * These fields are computed during decompression startup 434 */ 435 int max_h_samp_factor; /* largest h_samp_factor */ 436 int max_v_samp_factor; /* largest v_samp_factor */ 437 438 int min_DCT_scaled_size; /* smallest DCT_scaled_size of any component */ 439 440 JDIMENSION total_iMCU_rows; /* # of iMCU rows in image */ 441 /* The coefficient controller's input and output progress is measured in 442 * units of "iMCU" (interleaved MCU) rows. These are the same as MCU rows 443 * in fully interleaved JPEG scans, but are used whether the scan is 444 * interleaved or not. We define an iMCU row as v_samp_factor DCT block 445 * rows of each component. Therefore, the IDCT output contains 446 * v_samp_factor*DCT_scaled_size sample rows of a component per iMCU row. 447 */ 448 449 JSAMPLE * sample_range_limit; /* table for fast range-limiting */ 450 451 /* 452 * These fields are valid during any one scan. 453 * They describe the components and MCUs actually appearing in the scan. 454 * Note that the decompressor output side must not use these fields. 455 */ 456 int comps_in_scan; /* # of JPEG components in this scan */ 457 jpeg_component_info * cur_comp_info[MAX_COMPS_IN_SCAN]; 458 /* *cur_comp_info[i] describes component that appears i'th in SOS */ 459 460 JDIMENSION MCUs_per_row; /* # of MCUs across the image */ 461 JDIMENSION MCU_rows_in_scan; /* # of MCU rows in the image */ 462 463 int blocks_in_MCU; /* # of DCT blocks per MCU */ 464 int MCU_membership[D_MAX_BLOCKS_IN_MCU]; 465 /* MCU_membership[i] is index in cur_comp_info of component owning */ 466 /* i'th block in an MCU */ 467 468 int Ss, Se, Ah, Al; /* progressive JPEG parameters for scan */ 469 470 /* This field is shared between entropy decoder and marker parser. 471 * It is either zero or the code of a JPEG marker that has been 472 * read from the data source, but has not yet been processed. 473 */ 474 int unread_marker; 475 476 /* 477 * Links to decompression subobjects (methods, private variables of modules) 478 */ 479 struct jpeg_decomp_master * master; 480 struct jpeg_d_main_controller * main; 481 struct jpeg_d_coef_controller * coef; 482 struct jpeg_d_post_controller * post; 483 struct jpeg_input_controller * inputctl; 484 struct jpeg_marker_reader * marker; 485 struct jpeg_entropy_decoder * entropy; 486 struct jpeg_inverse_dct * idct; 487 struct jpeg_upsampler * upsample; 488 struct jpeg_color_deconverter * cconvert; 489 struct jpeg_color_quantizer * cquantize; 490 } *j_decompress_ptr; 491 492 493 /* "Object" declarations for JPEG modules that may be supplied or called 494 * directly by the surrounding application. 495 * As with all objects in the JPEG library, these structs only define the 496 * publicly visible methods and state variables of a module. Additional 497 * private fields may exist after the public ones. 498 */ 499 500 501 #ifdef __cplusplus 502 extern "C" { 503 #endif 504 505 /* Error handler object */ 506 507 struct jpeg_error_mgr { 508 /* Error exit handler: does not return to caller */ 509 JMETHOD(void, error_exit, (j_common_ptr cinfo)); 510 /* Conditionally emit a trace or warning message */ 511 JMETHOD(void, emit_message, (j_common_ptr cinfo, int msg_level)); 512 /* Routine that actually outputs a trace or error message */ 513 JMETHOD(void, output_message, (j_common_ptr cinfo)); 514 /* Format a message string for the most recent JPEG error or message */ 515 JMETHOD(void, format_message, (j_common_ptr cinfo, char * buffer)); 516 #define JMSG_LENGTH_MAX 200 /* recommended size of format_message buffer */ 517 /* Reset error state variables at start of a new image */ 518 JMETHOD(void, reset_error_mgr, (j_common_ptr cinfo)); 519 520 /* The message ID code and any parameters are saved here. 521 * A message can have one string parameter or up to 8 int parameters. 522 */ 523 int msg_code; 524 #define JMSG_STR_PARM_MAX 80 525 union { 526 int i[8]; 527 char s[JMSG_STR_PARM_MAX]; 528 } msg_parm; 529 530 /* Standard state variables for error facility */ 531 532 int trace_level; /* max msg_level that will be displayed */ 533 534 /* For recoverable corrupt-data errors, we emit a warning message, 535 * but keep going unless emit_message chooses to abort. emit_message 536 * should count warnings in num_warnings. The surrounding application 537 * can check for bad data by seeing if num_warnings is nonzero at the 538 * end of processing. 539 */ 540 long num_warnings; /* number of corrupt-data warnings */ 541 542 /* These fields point to the table(s) of error message strings. 543 * An application can change the table pointer to switch to a different 544 * message list (typically, to change the language in which errors are 545 * reported). Some applications may wish to add additional error codes 546 * that will be handled by the JPEG library error mechanism; the second 547 * table pointer is used for this purpose. 548 * 549 * First table includes all errors generated by JPEG library itself. 550 * Error code 0 is reserved for a "no such error string" message. 551 */ 552 const char * const * jpeg_message_table; /* Library errors */ 553 int last_jpeg_message; /* Table contains strings 0..last_jpeg_message */ 554 /* Second table can be added by application (see cjpeg/djpeg for example). 555 * It contains strings numbered first_addon_message..last_addon_message. 556 */ 557 const char * const * addon_message_table; /* Non-library errors */ 558 int first_addon_message; /* code for first string in addon table */ 559 int last_addon_message; /* code for last string in addon table */ 560 }; 561 562 563 /* Progress monitor object */ 564 565 struct jpeg_progress_mgr { 566 JMETHOD(void, progress_monitor, (j_common_ptr cinfo)); 567 568 long pass_counter; /* work units completed in this pass */ 569 long pass_limit; /* total number of work units in this pass */ 570 int completed_passes; /* passes completed so far */ 571 int total_passes; /* total number of passes expected */ 572 }; 573 574 575 /* Data destination object for compression */ 576 577 struct jpeg_destination_mgr { 578 JOCTET * next_output_byte; /* => next byte to write in buffer */ 579 size_t free_in_buffer; /* # of byte spaces remaining in buffer */ 580 581 JMETHOD(void, init_destination, (j_compress_ptr cinfo)); 582 JMETHOD(boolean, empty_output_buffer, (j_compress_ptr cinfo)); 583 JMETHOD(void, term_destination, (j_compress_ptr cinfo)); 584 }; 585 586 587 /* Data source object for decompression */ 588 589 struct jpeg_source_mgr { 590 const JOCTET * next_input_byte; /* => next byte to read from buffer */ 591 size_t bytes_in_buffer; /* # of bytes remaining in buffer */ 592 593 JMETHOD(void, init_source, (j_decompress_ptr cinfo)); 594 JMETHOD(boolean, fill_input_buffer, (j_decompress_ptr cinfo)); 595 JMETHOD(void, skip_input_data, (j_decompress_ptr cinfo, long num_bytes)); 596 JMETHOD(boolean, resync_to_restart, (j_decompress_ptr cinfo, int desired)); 597 JMETHOD(void, term_source, (j_decompress_ptr cinfo)); 598 }; 599 600 601 /* Memory manager object. 602 * Allocates "small" objects (a few K total), "large" objects (tens of K), 603 * and "really big" objects (virtual arrays with backing store if needed). 604 * The memory manager does not allow individual objects to be freed; rather, 605 * each created object is assigned to a pool, and whole pools can be freed 606 * at once. This is faster and more convenient than remembering exactly what 607 * to free, especially where malloc()/free() are not too speedy. 608 * NB: alloc routines never return NULL. They exit to error_exit if not 609 * successful. 610 */ 611 612 #define JPOOL_PERMANENT 0 /* lasts until master record is destroyed */ 613 #define JPOOL_IMAGE 1 /* lasts until done with image/datastream */ 614 #define JPOOL_NUMPOOLS 2 615 616 typedef struct jvirt_sarray_control * jvirt_sarray_ptr; 617 typedef struct jvirt_barray_control * jvirt_barray_ptr; 618 619 620 struct jpeg_memory_mgr { 621 /* Method pointers */ 622 JMETHOD(void *, alloc_small, (j_common_ptr cinfo, int pool_id, size_t sizeofobject)); 623 JMETHOD(void FAR *, alloc_large, (j_common_ptr cinfo, int pool_id, size_t sizeofobject)); 624 JMETHOD(JSAMPARRAY, alloc_sarray, (j_common_ptr cinfo, int pool_id, JDIMENSION samplesperrow, JDIMENSION numrows)); 625 JMETHOD(JBLOCKARRAY, alloc_barray, (j_common_ptr cinfo, int pool_id, JDIMENSION blocksperrow, JDIMENSION numrows)); 626 JMETHOD(jvirt_sarray_ptr, request_virt_sarray, (j_common_ptr cinfo, int pool_id, boolean pre_zero, JDIMENSION samplesperrow, JDIMENSION numrows, JDIMENSION maxaccess)); 627 JMETHOD(jvirt_barray_ptr, request_virt_barray, (j_common_ptr cinfo, int pool_id, boolean pre_zero, JDIMENSION blocksperrow, JDIMENSION numrows, JDIMENSION maxaccess)); 628 JMETHOD(void, realize_virt_arrays, (j_common_ptr cinfo)); 629 JMETHOD(JSAMPARRAY, access_virt_sarray, (j_common_ptr cinfo, jvirt_sarray_ptr ptr, JDIMENSION start_row, JDIMENSION num_rows, boolean writable)); 630 JMETHOD(JBLOCKARRAY, access_virt_barray, (j_common_ptr cinfo, jvirt_barray_ptr ptr, JDIMENSION start_row, JDIMENSION num_rows, boolean writable)); 631 JMETHOD(void, free_pool, (j_common_ptr cinfo, int pool_id)); 632 JMETHOD(void, self_destruct, (j_common_ptr cinfo)); 633 634 /* Limit on memory allocation for this JPEG object. (Note that this is 635 * merely advisory, not a guaranteed maximum; it only affects the space 636 * used for virtual-array buffers.) May be changed by outer application 637 * after creating the JPEG object. 638 */ 639 long max_memory_to_use; 640 641 /* Maximum allocation request accepted by alloc_large. */ 642 long max_alloc_chunk; 643 }; 644 645 646 /* Routine signature for application-supplied marker processing methods. 647 * Need not pass marker code since it is stored in cinfo->unread_marker. 648 */ 649 typedef JMETHOD(boolean, jpeg_marker_parser_method, (j_decompress_ptr cinfo)); 650 651 652 /* Declarations for routines called by application. 653 * The JPP macro hides prototype parameters from compilers that can't cope. 654 * Note JPP requires double parentheses. 655 */ 656 657 #define JPP(arglist) arglist 658 659 660 /* Return value (jpeg_read_header) is one of: */ 661 #define JPEG_SUSPENDED 0 /* Suspended due to lack of input data */ 662 #define JPEG_HEADER_OK 1 /* Found valid image datastream */ 663 #define JPEG_HEADER_TABLES_ONLY 2 /* Found valid table-specs-only datastream */ 664 /* If you pass require_image = TRUE (normal case), you need not check for 665 * a TABLES_ONLY return code; an abbreviated file will cause an error exit. 666 * JPEG_SUSPENDED is only possible if you use a data source module that can 667 * give a suspension return (the stdio source module doesn't). 668 */ 669 670 /* Return value (jpeg_consume_input) is one of: */ 671 /* #define JPEG_SUSPENDED 0 Suspended due to lack of input data */ 672 #define JPEG_REACHED_SOS 1 /* Reached start of new scan */ 673 #define JPEG_REACHED_EOI 2 /* Reached end of image */ 674 #define JPEG_ROW_COMPLETED 3 /* Completed one iMCU row */ 675 #define JPEG_SCAN_COMPLETED 4 /* Completed last iMCU row of a scan */ 676 677 678 #define JPEG_RST0 0xD0 679 #define JPEG_EOI 0xD9 680 #define JPEG_APP0 0xE0 681 #define JPEG_COM 0xFE 682 683 684 /* These defintions are sometimes needed by some applications */ 685 #ifdef JPEG_INTERNAL_OPTIONS 686 687 #define RGB_RED 0 /* Offset of Red in an RGB scanline element */ 688 #define RGB_GREEN 1 /* Offset of Green */ 689 #define RGB_BLUE 2 /* Offset of Blue */ 690 #define RGB_PIXELSIZE 3 /* JSAMPLEs per RGB scanline element */ 691 692 #endif /* JPEG_INTERNAL_OPTIONS */ 693 694 #ifdef __cplusplus 695 } 696 #endif 697 698 #endif /* LIBRARIES_JFIF_H */