1#if !defined(_FX_JPEG_TURBO_) 2/* 3 * jcmaster.c 4 * 5 * Copyright (C) 1991-1997, 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 contains master control logic for the JPEG compressor. 10 * These routines are concerned with parameter validation, initial setup, 11 * and inter-pass control (determining the number of passes and the work 12 * to be done in each pass). 13 */ 14 15#define JPEG_INTERNALS 16#include "jinclude.h" 17#include "jpeglib.h" 18 19 20/* Private state */ 21 22typedef enum { 23 main_pass, /* input data, also do first output step */ 24 huff_opt_pass, /* Huffman code optimization pass */ 25 output_pass /* data output pass */ 26} c_pass_type; 27 28typedef struct { 29 struct jpeg_comp_master pub; /* public fields */ 30 31 c_pass_type pass_type; /* the type of the current pass */ 32 33 int pass_number; /* # of passes completed */ 34 int total_passes; /* total # of passes needed */ 35 36 int scan_number; /* current index in scan_info[] */ 37} my_comp_master; 38 39typedef my_comp_master * my_master_ptr; 40 41 42/* 43 * Support routines that do various essential calculations. 44 */ 45 46LOCAL(void) 47initial_setup (j_compress_ptr cinfo) 48/* Do computations that are needed before master selection phase */ 49{ 50 int ci; 51 jpeg_component_info *compptr; 52 long samplesperrow; 53 JDIMENSION jd_samplesperrow; 54 55 /* Sanity check on image dimensions */ 56 if (cinfo->image_height <= 0 || cinfo->image_width <= 0 57 || cinfo->num_components <= 0 || cinfo->input_components <= 0) 58 ERREXIT(cinfo, JERR_EMPTY_IMAGE); 59 60 /* Make sure image isn't bigger than I can handle */ 61 if ((long) cinfo->image_height > (long) JPEG_MAX_DIMENSION || 62 (long) cinfo->image_width > (long) JPEG_MAX_DIMENSION) 63 ERREXIT1(cinfo, JERR_IMAGE_TOO_BIG, (unsigned int) JPEG_MAX_DIMENSION); 64 65 /* Width of an input scanline must be representable as JDIMENSION. */ 66 samplesperrow = (long) cinfo->image_width * (long) cinfo->input_components; 67 jd_samplesperrow = (JDIMENSION) samplesperrow; 68 if ((long) jd_samplesperrow != samplesperrow) 69 ERREXIT(cinfo, JERR_WIDTH_OVERFLOW); 70 71 /* For now, precision must match compiled-in value... */ 72 if (cinfo->data_precision != BITS_IN_JSAMPLE) 73 ERREXIT1(cinfo, JERR_BAD_PRECISION, cinfo->data_precision); 74 75 /* Check that number of components won't exceed internal array sizes */ 76 if (cinfo->num_components > MAX_COMPONENTS) 77 ERREXIT2(cinfo, JERR_COMPONENT_COUNT, cinfo->num_components, 78 MAX_COMPONENTS); 79 80 /* Compute maximum sampling factors; check factor validity */ 81 cinfo->max_h_samp_factor = 1; 82 cinfo->max_v_samp_factor = 1; 83 for (ci = 0, compptr = cinfo->comp_info; ci < cinfo->num_components; 84 ci++, compptr++) { 85 if (compptr->h_samp_factor<=0 || compptr->h_samp_factor>MAX_SAMP_FACTOR || 86 compptr->v_samp_factor<=0 || compptr->v_samp_factor>MAX_SAMP_FACTOR) 87 ERREXIT(cinfo, JERR_BAD_SAMPLING); 88 cinfo->max_h_samp_factor = MAX(cinfo->max_h_samp_factor, 89 compptr->h_samp_factor); 90 cinfo->max_v_samp_factor = MAX(cinfo->max_v_samp_factor, 91 compptr->v_samp_factor); 92 } 93 94 /* Compute dimensions of components */ 95 for (ci = 0, compptr = cinfo->comp_info; ci < cinfo->num_components; 96 ci++, compptr++) { 97 /* Fill in the correct component_index value; don't rely on application */ 98 compptr->component_index = ci; 99 /* For compression, we never do DCT scaling. */ 100 compptr->DCT_scaled_size = DCTSIZE; 101 /* Size in DCT blocks */ 102 compptr->width_in_blocks = (JDIMENSION) 103 jdiv_round_up((long) cinfo->image_width * (long) compptr->h_samp_factor, 104 (long) (cinfo->max_h_samp_factor * DCTSIZE)); 105 compptr->height_in_blocks = (JDIMENSION) 106 jdiv_round_up((long) cinfo->image_height * (long) compptr->v_samp_factor, 107 (long) (cinfo->max_v_samp_factor * DCTSIZE)); 108 /* Size in samples */ 109 compptr->downsampled_width = (JDIMENSION) 110 jdiv_round_up((long) cinfo->image_width * (long) compptr->h_samp_factor, 111 (long) cinfo->max_h_samp_factor); 112 compptr->downsampled_height = (JDIMENSION) 113 jdiv_round_up((long) cinfo->image_height * (long) compptr->v_samp_factor, 114 (long) cinfo->max_v_samp_factor); 115 /* Mark component needed (this flag isn't actually used for compression) */ 116 compptr->component_needed = TRUE; 117 } 118 119 /* Compute number of fully interleaved MCU rows (number of times that 120 * main controller will call coefficient controller). 121 */ 122 cinfo->total_iMCU_rows = (JDIMENSION) 123 jdiv_round_up((long) cinfo->image_height, 124 (long) (cinfo->max_v_samp_factor*DCTSIZE)); 125} 126 127 128#ifdef C_MULTISCAN_FILES_SUPPORTED 129 130LOCAL(void) 131validate_script (j_compress_ptr cinfo) 132/* Verify that the scan script in cinfo->scan_info[] is valid; also 133 * determine whether it uses progressive JPEG, and set cinfo->progressive_mode. 134 */ 135{ 136 const jpeg_scan_info * scanptr; 137 int scanno, ncomps, ci, coefi, thisi; 138 int Ss, Se, Ah, Al; 139 boolean component_sent[MAX_COMPONENTS]; 140#ifdef C_PROGRESSIVE_SUPPORTED 141 int * last_bitpos_ptr; 142 int last_bitpos[MAX_COMPONENTS][DCTSIZE2]; 143 /* -1 until that coefficient has been seen; then last Al for it */ 144#endif 145 146 if (cinfo->num_scans <= 0) 147 ERREXIT1(cinfo, JERR_BAD_SCAN_SCRIPT, 0); 148 149 /* For sequential JPEG, all scans must have Ss=0, Se=DCTSIZE2-1; 150 * for progressive JPEG, no scan can have this. 151 */ 152 scanptr = cinfo->scan_info; 153 if (scanptr->Ss != 0 || scanptr->Se != DCTSIZE2-1) { 154#ifdef C_PROGRESSIVE_SUPPORTED 155 cinfo->progressive_mode = TRUE; 156 last_bitpos_ptr = & last_bitpos[0][0]; 157 for (ci = 0; ci < cinfo->num_components; ci++) 158 for (coefi = 0; coefi < DCTSIZE2; coefi++) 159 *last_bitpos_ptr++ = -1; 160#else 161 ERREXIT(cinfo, JERR_NOT_COMPILED); 162#endif 163 } else { 164 cinfo->progressive_mode = FALSE; 165 for (ci = 0; ci < cinfo->num_components; ci++) 166 component_sent[ci] = FALSE; 167 } 168 169 for (scanno = 1; scanno <= cinfo->num_scans; scanptr++, scanno++) { 170 /* Validate component indexes */ 171 ncomps = scanptr->comps_in_scan; 172 if (ncomps <= 0 || ncomps > MAX_COMPS_IN_SCAN) 173 ERREXIT2(cinfo, JERR_COMPONENT_COUNT, ncomps, MAX_COMPS_IN_SCAN); 174 for (ci = 0; ci < ncomps; ci++) { 175 thisi = scanptr->component_index[ci]; 176 if (thisi < 0 || thisi >= cinfo->num_components) 177 ERREXIT1(cinfo, JERR_BAD_SCAN_SCRIPT, scanno); 178 /* Components must appear in SOF order within each scan */ 179 if (ci > 0 && thisi <= scanptr->component_index[ci-1]) 180 ERREXIT1(cinfo, JERR_BAD_SCAN_SCRIPT, scanno); 181 } 182 /* Validate progression parameters */ 183 Ss = scanptr->Ss; 184 Se = scanptr->Se; 185 Ah = scanptr->Ah; 186 Al = scanptr->Al; 187 if (cinfo->progressive_mode) { 188#ifdef C_PROGRESSIVE_SUPPORTED 189 /* The JPEG spec simply gives the ranges 0..13 for Ah and Al, but that 190 * seems wrong: the upper bound ought to depend on data precision. 191 * Perhaps they really meant 0..N+1 for N-bit precision. 192 * Here we allow 0..10 for 8-bit data; Al larger than 10 results in 193 * out-of-range reconstructed DC values during the first DC scan, 194 * which might cause problems for some decoders. 195 */ 196#if BITS_IN_JSAMPLE == 8 197#define MAX_AH_AL 10 198#else 199#define MAX_AH_AL 13 200#endif 201 if (Ss < 0 || Ss >= DCTSIZE2 || Se < Ss || Se >= DCTSIZE2 || 202 Ah < 0 || Ah > MAX_AH_AL || Al < 0 || Al > MAX_AH_AL) 203 ERREXIT1(cinfo, JERR_BAD_PROG_SCRIPT, scanno); 204 if (Ss == 0) { 205 if (Se != 0) /* DC and AC together not OK */ 206 ERREXIT1(cinfo, JERR_BAD_PROG_SCRIPT, scanno); 207 } else { 208 if (ncomps != 1) /* AC scans must be for only one component */ 209 ERREXIT1(cinfo, JERR_BAD_PROG_SCRIPT, scanno); 210 } 211 for (ci = 0; ci < ncomps; ci++) { 212 last_bitpos_ptr = & last_bitpos[scanptr->component_index[ci]][0]; 213 if (Ss != 0 && last_bitpos_ptr[0] < 0) /* AC without prior DC scan */ 214 ERREXIT1(cinfo, JERR_BAD_PROG_SCRIPT, scanno); 215 for (coefi = Ss; coefi <= Se; coefi++) { 216 if (last_bitpos_ptr[coefi] < 0) { 217 /* first scan of this coefficient */ 218 if (Ah != 0) 219 ERREXIT1(cinfo, JERR_BAD_PROG_SCRIPT, scanno); 220 } else { 221 /* not first scan */ 222 if (Ah != last_bitpos_ptr[coefi] || Al != Ah-1) 223 ERREXIT1(cinfo, JERR_BAD_PROG_SCRIPT, scanno); 224 } 225 last_bitpos_ptr[coefi] = Al; 226 } 227 } 228#endif 229 } else { 230 /* For sequential JPEG, all progression parameters must be these: */ 231 if (Ss != 0 || Se != DCTSIZE2-1 || Ah != 0 || Al != 0) 232 ERREXIT1(cinfo, JERR_BAD_PROG_SCRIPT, scanno); 233 /* Make sure components are not sent twice */ 234 for (ci = 0; ci < ncomps; ci++) { 235 thisi = scanptr->component_index[ci]; 236 if (component_sent[thisi]) 237 ERREXIT1(cinfo, JERR_BAD_SCAN_SCRIPT, scanno); 238 component_sent[thisi] = TRUE; 239 } 240 } 241 } 242 243 /* Now verify that everything got sent. */ 244 if (cinfo->progressive_mode) { 245#ifdef C_PROGRESSIVE_SUPPORTED 246 /* For progressive mode, we only check that at least some DC data 247 * got sent for each component; the spec does not require that all bits 248 * of all coefficients be transmitted. Would it be wiser to enforce 249 * transmission of all coefficient bits?? 250 */ 251 for (ci = 0; ci < cinfo->num_components; ci++) { 252 if (last_bitpos[ci][0] < 0) 253 ERREXIT(cinfo, JERR_MISSING_DATA); 254 } 255#endif 256 } else { 257 for (ci = 0; ci < cinfo->num_components; ci++) { 258 if (! component_sent[ci]) 259 ERREXIT(cinfo, JERR_MISSING_DATA); 260 } 261 } 262} 263 264#endif /* C_MULTISCAN_FILES_SUPPORTED */ 265 266 267LOCAL(void) 268select_scan_parameters (j_compress_ptr cinfo) 269/* Set up the scan parameters for the current scan */ 270{ 271 int ci; 272 273#ifdef C_MULTISCAN_FILES_SUPPORTED 274 if (cinfo->scan_info != NULL) { 275 /* Prepare for current scan --- the script is already validated */ 276 my_master_ptr master = (my_master_ptr) cinfo->master; 277 const jpeg_scan_info * scanptr = cinfo->scan_info + master->scan_number; 278 279 cinfo->comps_in_scan = scanptr->comps_in_scan; 280 for (ci = 0; ci < scanptr->comps_in_scan; ci++) { 281 cinfo->cur_comp_info[ci] = 282 &cinfo->comp_info[scanptr->component_index[ci]]; 283 } 284 cinfo->Ss = scanptr->Ss; 285 cinfo->Se = scanptr->Se; 286 cinfo->Ah = scanptr->Ah; 287 cinfo->Al = scanptr->Al; 288 } 289 else 290#endif 291 { 292 /* Prepare for single sequential-JPEG scan containing all components */ 293 if (cinfo->num_components > MAX_COMPS_IN_SCAN) 294 ERREXIT2(cinfo, JERR_COMPONENT_COUNT, cinfo->num_components, 295 MAX_COMPS_IN_SCAN); 296 cinfo->comps_in_scan = cinfo->num_components; 297 for (ci = 0; ci < cinfo->num_components; ci++) { 298 cinfo->cur_comp_info[ci] = &cinfo->comp_info[ci]; 299 } 300 cinfo->Ss = 0; 301 cinfo->Se = DCTSIZE2-1; 302 cinfo->Ah = 0; 303 cinfo->Al = 0; 304 } 305} 306 307 308LOCAL(void) 309per_scan_setup (j_compress_ptr cinfo) 310/* Do computations that are needed before processing a JPEG scan */ 311/* cinfo->comps_in_scan and cinfo->cur_comp_info[] are already set */ 312{ 313 int ci, mcublks, tmp; 314 jpeg_component_info *compptr; 315 316 if (cinfo->comps_in_scan == 1) { 317 318 /* Noninterleaved (single-component) scan */ 319 compptr = cinfo->cur_comp_info[0]; 320 321 /* Overall image size in MCUs */ 322 cinfo->MCUs_per_row = compptr->width_in_blocks; 323 cinfo->MCU_rows_in_scan = compptr->height_in_blocks; 324 325 /* For noninterleaved scan, always one block per MCU */ 326 compptr->MCU_width = 1; 327 compptr->MCU_height = 1; 328 compptr->MCU_blocks = 1; 329 compptr->MCU_sample_width = DCTSIZE; 330 compptr->last_col_width = 1; 331 /* For noninterleaved scans, it is convenient to define last_row_height 332 * as the number of block rows present in the last iMCU row. 333 */ 334 tmp = (int) (compptr->height_in_blocks % compptr->v_samp_factor); 335 if (tmp == 0) tmp = compptr->v_samp_factor; 336 compptr->last_row_height = tmp; 337 338 /* Prepare array describing MCU composition */ 339 cinfo->blocks_in_MCU = 1; 340 cinfo->MCU_membership[0] = 0; 341 342 } else { 343 344 /* Interleaved (multi-component) scan */ 345 if (cinfo->comps_in_scan <= 0 || cinfo->comps_in_scan > MAX_COMPS_IN_SCAN) 346 ERREXIT2(cinfo, JERR_COMPONENT_COUNT, cinfo->comps_in_scan, 347 MAX_COMPS_IN_SCAN); 348 349 /* Overall image size in MCUs */ 350 cinfo->MCUs_per_row = (JDIMENSION) 351 jdiv_round_up((long) cinfo->image_width, 352 (long) (cinfo->max_h_samp_factor*DCTSIZE)); 353 cinfo->MCU_rows_in_scan = (JDIMENSION) 354 jdiv_round_up((long) cinfo->image_height, 355 (long) (cinfo->max_v_samp_factor*DCTSIZE)); 356 357 cinfo->blocks_in_MCU = 0; 358 359 for (ci = 0; ci < cinfo->comps_in_scan; ci++) { 360 compptr = cinfo->cur_comp_info[ci]; 361 /* Sampling factors give # of blocks of component in each MCU */ 362 compptr->MCU_width = compptr->h_samp_factor; 363 compptr->MCU_height = compptr->v_samp_factor; 364 compptr->MCU_blocks = compptr->MCU_width * compptr->MCU_height; 365 compptr->MCU_sample_width = compptr->MCU_width * DCTSIZE; 366 /* Figure number of non-dummy blocks in last MCU column & row */ 367 tmp = (int) (compptr->width_in_blocks % compptr->MCU_width); 368 if (tmp == 0) tmp = compptr->MCU_width; 369 compptr->last_col_width = tmp; 370 tmp = (int) (compptr->height_in_blocks % compptr->MCU_height); 371 if (tmp == 0) tmp = compptr->MCU_height; 372 compptr->last_row_height = tmp; 373 /* Prepare array describing MCU composition */ 374 mcublks = compptr->MCU_blocks; 375 if (cinfo->blocks_in_MCU + mcublks > C_MAX_BLOCKS_IN_MCU) 376 ERREXIT(cinfo, JERR_BAD_MCU_SIZE); 377 while (mcublks-- > 0) { 378 cinfo->MCU_membership[cinfo->blocks_in_MCU++] = ci; 379 } 380 } 381 382 } 383 384 /* Convert restart specified in rows to actual MCU count. */ 385 /* Note that count must fit in 16 bits, so we provide limiting. */ 386 if (cinfo->restart_in_rows > 0) { 387 long nominal = (long) cinfo->restart_in_rows * (long) cinfo->MCUs_per_row; 388 cinfo->restart_interval = (unsigned int) MIN(nominal, 65535L); 389 } 390} 391 392 393/* 394 * Per-pass setup. 395 * This is called at the beginning of each pass. We determine which modules 396 * will be active during this pass and give them appropriate start_pass calls. 397 * We also set is_last_pass to indicate whether any more passes will be 398 * required. 399 */ 400 401METHODDEF(void) 402prepare_for_pass (j_compress_ptr cinfo) 403{ 404 my_master_ptr master = (my_master_ptr) cinfo->master; 405 406 switch (master->pass_type) { 407 case main_pass: 408 /* Initial pass: will collect input data, and do either Huffman 409 * optimization or data output for the first scan. 410 */ 411 select_scan_parameters(cinfo); 412 per_scan_setup(cinfo); 413 if (! cinfo->raw_data_in) { 414 (*cinfo->cconvert->start_pass) (cinfo); 415 (*cinfo->downsample->start_pass) (cinfo); 416 (*cinfo->prep->start_pass) (cinfo, JBUF_PASS_THRU); 417 } 418 (*cinfo->fdct->start_pass) (cinfo); 419 (*cinfo->entropy->start_pass) (cinfo, cinfo->optimize_coding); 420 (*cinfo->coef->start_pass) (cinfo, 421 (master->total_passes > 1 ? 422 JBUF_SAVE_AND_PASS : JBUF_PASS_THRU)); 423 (*cinfo->main->start_pass) (cinfo, JBUF_PASS_THRU); 424 if (cinfo->optimize_coding) { 425 /* No immediate data output; postpone writing frame/scan headers */ 426 master->pub.call_pass_startup = FALSE; 427 } else { 428 /* Will write frame/scan headers at first jpeg_write_scanlines call */ 429 master->pub.call_pass_startup = TRUE; 430 } 431 break; 432#ifdef ENTROPY_OPT_SUPPORTED 433 case huff_opt_pass: 434 /* Do Huffman optimization for a scan after the first one. */ 435 select_scan_parameters(cinfo); 436 per_scan_setup(cinfo); 437 if (cinfo->Ss != 0 || cinfo->Ah == 0 || cinfo->arith_code) { 438 (*cinfo->entropy->start_pass) (cinfo, TRUE); 439 (*cinfo->coef->start_pass) (cinfo, JBUF_CRANK_DEST); 440 master->pub.call_pass_startup = FALSE; 441 break; 442 } 443 /* Special case: Huffman DC refinement scans need no Huffman table 444 * and therefore we can skip the optimization pass for them. 445 */ 446 master->pass_type = output_pass; 447 master->pass_number++; 448 /*FALLTHROUGH*/ 449#endif 450 case output_pass: 451 /* Do a data-output pass. */ 452 /* We need not repeat per-scan setup if prior optimization pass did it. */ 453 if (! cinfo->optimize_coding) { 454 select_scan_parameters(cinfo); 455 per_scan_setup(cinfo); 456 } 457 (*cinfo->entropy->start_pass) (cinfo, FALSE); 458 (*cinfo->coef->start_pass) (cinfo, JBUF_CRANK_DEST); 459 /* We emit frame/scan headers now */ 460 if (master->scan_number == 0) 461 (*cinfo->marker->write_frame_header) (cinfo); 462 (*cinfo->marker->write_scan_header) (cinfo); 463 master->pub.call_pass_startup = FALSE; 464 break; 465 default: 466 ERREXIT(cinfo, JERR_NOT_COMPILED); 467 } 468 469 master->pub.is_last_pass = (master->pass_number == master->total_passes-1); 470 471 /* Set up progress monitor's pass info if present */ 472 if (cinfo->progress != NULL) { 473 cinfo->progress->completed_passes = master->pass_number; 474 cinfo->progress->total_passes = master->total_passes; 475 } 476} 477 478 479/* 480 * Special start-of-pass hook. 481 * This is called by jpeg_write_scanlines if call_pass_startup is TRUE. 482 * In single-pass processing, we need this hook because we don't want to 483 * write frame/scan headers during jpeg_start_compress; we want to let the 484 * application write COM markers etc. between jpeg_start_compress and the 485 * jpeg_write_scanlines loop. 486 * In multi-pass processing, this routine is not used. 487 */ 488 489METHODDEF(void) 490pass_startup (j_compress_ptr cinfo) 491{ 492 cinfo->master->call_pass_startup = FALSE; /* reset flag so call only once */ 493 494 (*cinfo->marker->write_frame_header) (cinfo); 495 (*cinfo->marker->write_scan_header) (cinfo); 496} 497 498 499/* 500 * Finish up at end of pass. 501 */ 502 503METHODDEF(void) 504finish_pass_master (j_compress_ptr cinfo) 505{ 506 my_master_ptr master = (my_master_ptr) cinfo->master; 507 508 /* The entropy coder always needs an end-of-pass call, 509 * either to analyze statistics or to flush its output buffer. 510 */ 511 (*cinfo->entropy->finish_pass) (cinfo); 512 513 /* Update state for next pass */ 514 switch (master->pass_type) { 515 case main_pass: 516 /* next pass is either output of scan 0 (after optimization) 517 * or output of scan 1 (if no optimization). 518 */ 519 master->pass_type = output_pass; 520 if (! cinfo->optimize_coding) 521 master->scan_number++; 522 break; 523 case huff_opt_pass: 524 /* next pass is always output of current scan */ 525 master->pass_type = output_pass; 526 break; 527 case output_pass: 528 /* next pass is either optimization or output of next scan */ 529 if (cinfo->optimize_coding) 530 master->pass_type = huff_opt_pass; 531 master->scan_number++; 532 break; 533 } 534 535 master->pass_number++; 536} 537 538 539/* 540 * Initialize master compression control. 541 */ 542 543GLOBAL(void) 544jinit_c_master_control (j_compress_ptr cinfo, boolean transcode_only) 545{ 546 my_master_ptr master; 547 548 master = (my_master_ptr) 549 (*cinfo->mem->alloc_small) ((j_common_ptr) cinfo, JPOOL_IMAGE, 550 SIZEOF(my_comp_master)); 551 cinfo->master = (struct jpeg_comp_master *) master; 552 master->pub.prepare_for_pass = prepare_for_pass; 553 master->pub.pass_startup = pass_startup; 554 master->pub.finish_pass = finish_pass_master; 555 master->pub.is_last_pass = FALSE; 556 557 /* Validate parameters, determine derived values */ 558 initial_setup(cinfo); 559 560 if (cinfo->scan_info != NULL) { 561#ifdef C_MULTISCAN_FILES_SUPPORTED 562 validate_script(cinfo); 563#else 564 ERREXIT(cinfo, JERR_NOT_COMPILED); 565#endif 566 } else { 567 cinfo->progressive_mode = FALSE; 568 cinfo->num_scans = 1; 569 } 570 571 if (cinfo->progressive_mode) /* TEMPORARY HACK ??? */ 572 cinfo->optimize_coding = TRUE; /* assume default tables no good for progressive mode */ 573 574 /* Initialize my private state */ 575 if (transcode_only) { 576 /* no main pass in transcoding */ 577 if (cinfo->optimize_coding) 578 master->pass_type = huff_opt_pass; 579 else 580 master->pass_type = output_pass; 581 } else { 582 /* for normal compression, first pass is always this type: */ 583 master->pass_type = main_pass; 584 } 585 master->scan_number = 0; 586 master->pass_number = 0; 587 if (cinfo->optimize_coding) 588 master->total_passes = cinfo->num_scans * 2; 589 else 590 master->total_passes = cinfo->num_scans; 591} 592 593#endif //_FX_JPEG_TURBO_ 594