1/* 2 * jdmaster.c 3 * 4 * Copyright (C) 1991-1997, 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 contains master control logic for the JPEG decompressor. 9 * These routines are concerned with selecting the modules to be executed 10 * and with determining the number of passes and the work to be done in each 11 * pass. 12 */ 13 14#define JPEG_INTERNALS 15#include "jinclude.h" 16#include "jpeglib.h" 17 18 19/* Private state */ 20 21typedef struct { 22 struct jpeg_decomp_master pub; /* public fields */ 23 24 int pass_number; /* # of passes completed */ 25 26 boolean using_merged_upsample; /* TRUE if using merged upsample/cconvert */ 27 28 /* Saved references to initialized quantizer modules, 29 * in case we need to switch modes. 30 */ 31 struct jpeg_color_quantizer * quantizer_1pass; 32 struct jpeg_color_quantizer * quantizer_2pass; 33} my_decomp_master; 34 35typedef my_decomp_master * my_master_ptr; 36 37 38/* 39 * Determine whether merged upsample/color conversion should be used. 40 * CRUCIAL: this must match the actual capabilities of jdmerge.c! 41 */ 42 43LOCAL(boolean) 44use_merged_upsample (j_decompress_ptr cinfo) 45{ 46#ifdef UPSAMPLE_MERGING_SUPPORTED 47 /* Merging is the equivalent of plain box-filter upsampling */ 48 if (cinfo->do_fancy_upsampling || cinfo->CCIR601_sampling) 49 return FALSE; 50 51#ifdef ANDROID_RGB 52 /* jdmerge.c only supports YCC=>RGB565 and YCC=>RGB color conversion */ 53 if (cinfo->jpeg_color_space != JCS_YCbCr || 54 cinfo->num_components != 3 || 55 cinfo->out_color_components != 3 || 56 (cinfo->out_color_space != JCS_RGB_565 && 57 cinfo->out_color_space != JCS_RGB)) { 58 return FALSE; 59 } 60#else 61 /* jdmerge.c only supports YCC=>RGB color conversion */ 62 if (cinfo->jpeg_color_space != JCS_YCbCr || cinfo->num_components != 3 || 63 cinfo->out_color_space != JCS_RGB || 64 cinfo->out_color_components != RGB_PIXELSIZE) 65 return FALSE; 66#endif 67 68 /* and it only handles 2h1v or 2h2v sampling ratios */ 69 if (cinfo->comp_info[0].h_samp_factor != 2 || 70 cinfo->comp_info[1].h_samp_factor != 1 || 71 cinfo->comp_info[2].h_samp_factor != 1 || 72 cinfo->comp_info[0].v_samp_factor > 2 || 73 cinfo->comp_info[1].v_samp_factor != 1 || 74 cinfo->comp_info[2].v_samp_factor != 1) 75 return FALSE; 76 /* furthermore, it doesn't work if we've scaled the IDCTs differently */ 77 if (cinfo->comp_info[0].DCT_scaled_size != cinfo->min_DCT_scaled_size || 78 cinfo->comp_info[1].DCT_scaled_size != cinfo->min_DCT_scaled_size || 79 cinfo->comp_info[2].DCT_scaled_size != cinfo->min_DCT_scaled_size) 80 return FALSE; 81 /* ??? also need to test for upsample-time rescaling, when & if supported */ 82 return TRUE; /* by golly, it'll work... */ 83#else 84 return FALSE; 85#endif 86} 87 88 89/* 90 * Compute output image dimensions and related values. 91 * NOTE: this is exported for possible use by application. 92 * Hence it mustn't do anything that can't be done twice. 93 * Also note that it may be called before the master module is initialized! 94 */ 95 96GLOBAL(void) 97jpeg_calc_output_dimensions (j_decompress_ptr cinfo) 98/* Do computations that are needed before master selection phase */ 99{ 100#ifdef IDCT_SCALING_SUPPORTED 101 int ci; 102 jpeg_component_info *compptr; 103#endif 104 105 /* Prevent application from calling me at wrong times */ 106 if (cinfo->global_state != DSTATE_READY) 107 ERREXIT1(cinfo, JERR_BAD_STATE, cinfo->global_state); 108 109#ifdef IDCT_SCALING_SUPPORTED 110 111 /* Compute actual output image dimensions and DCT scaling choices. */ 112 if (cinfo->scale_num * 8 <= cinfo->scale_denom) { 113 /* Provide 1/8 scaling */ 114 cinfo->output_width = (JDIMENSION) 115 jdiv_round_up((long) cinfo->image_width, 8L); 116 cinfo->output_height = (JDIMENSION) 117 jdiv_round_up((long) cinfo->image_height, 8L); 118 cinfo->min_DCT_scaled_size = 1; 119 } else if (cinfo->scale_num * 4 <= cinfo->scale_denom) { 120 /* Provide 1/4 scaling */ 121 cinfo->output_width = (JDIMENSION) 122 jdiv_round_up((long) cinfo->image_width, 4L); 123 cinfo->output_height = (JDIMENSION) 124 jdiv_round_up((long) cinfo->image_height, 4L); 125 cinfo->min_DCT_scaled_size = 2; 126 } else if (cinfo->scale_num * 2 <= cinfo->scale_denom) { 127 /* Provide 1/2 scaling */ 128 cinfo->output_width = (JDIMENSION) 129 jdiv_round_up((long) cinfo->image_width, 2L); 130 cinfo->output_height = (JDIMENSION) 131 jdiv_round_up((long) cinfo->image_height, 2L); 132 cinfo->min_DCT_scaled_size = 4; 133 } else { 134 /* Provide 1/1 scaling */ 135 cinfo->output_width = cinfo->image_width; 136 cinfo->output_height = cinfo->image_height; 137 cinfo->min_DCT_scaled_size = DCTSIZE; 138 } 139 /* In selecting the actual DCT scaling for each component, we try to 140 * scale up the chroma components via IDCT scaling rather than upsampling. 141 * This saves time if the upsampler gets to use 1:1 scaling. 142 * Note this code assumes that the supported DCT scalings are powers of 2. 143 */ 144 for (ci = 0, compptr = cinfo->comp_info; ci < cinfo->num_components; 145 ci++, compptr++) { 146 int ssize = cinfo->min_DCT_scaled_size; 147 while (ssize < DCTSIZE && 148 (compptr->h_samp_factor * ssize * 2 <= 149 cinfo->max_h_samp_factor * cinfo->min_DCT_scaled_size) && 150 (compptr->v_samp_factor * ssize * 2 <= 151 cinfo->max_v_samp_factor * cinfo->min_DCT_scaled_size)) { 152 ssize = ssize * 2; 153 } 154 compptr->DCT_scaled_size = ssize; 155 } 156 157 /* Recompute downsampled dimensions of components; 158 * application needs to know these if using raw downsampled data. 159 */ 160 for (ci = 0, compptr = cinfo->comp_info; ci < cinfo->num_components; 161 ci++, compptr++) { 162 /* Size in samples, after IDCT scaling */ 163 compptr->downsampled_width = (JDIMENSION) 164 jdiv_round_up((long) cinfo->image_width * 165 (long) (compptr->h_samp_factor * compptr->DCT_scaled_size), 166 (long) (cinfo->max_h_samp_factor * DCTSIZE)); 167 compptr->downsampled_height = (JDIMENSION) 168 jdiv_round_up((long) cinfo->image_height * 169 (long) (compptr->v_samp_factor * compptr->DCT_scaled_size), 170 (long) (cinfo->max_v_samp_factor * DCTSIZE)); 171 } 172 173#else /* !IDCT_SCALING_SUPPORTED */ 174 175 /* Hardwire it to "no scaling" */ 176 cinfo->output_width = cinfo->image_width; 177 cinfo->output_height = cinfo->image_height; 178 /* jdinput.c has already initialized DCT_scaled_size to DCTSIZE, 179 * and has computed unscaled downsampled_width and downsampled_height. 180 */ 181 182#endif /* IDCT_SCALING_SUPPORTED */ 183 184 /* Report number of components in selected colorspace. */ 185 /* Probably this should be in the color conversion module... */ 186 switch (cinfo->out_color_space) { 187 case JCS_GRAYSCALE: 188 cinfo->out_color_components = 1; 189 break; 190 case JCS_RGB: 191#if RGB_PIXELSIZE != 3 192 cinfo->out_color_components = RGB_PIXELSIZE; 193 break; 194#endif /* else share code with YCbCr */ 195#ifdef ANDROID_RGB 196 case JCS_RGB_565: 197#endif 198 case JCS_YCbCr: 199 cinfo->out_color_components = 3; 200 break; 201 case JCS_CMYK: 202 case JCS_YCCK: 203#ifdef ANDROID_RGB 204 case JCS_RGBA_8888: 205#endif 206 cinfo->out_color_components = 4; 207 break; 208 default: /* else must be same colorspace as in file */ 209 cinfo->out_color_components = cinfo->num_components; 210 break; 211 } 212 cinfo->output_components = (cinfo->quantize_colors ? 1 : 213 cinfo->out_color_components); 214 215 /* See if upsampler will want to emit more than one row at a time */ 216 if (use_merged_upsample(cinfo)) 217 cinfo->rec_outbuf_height = cinfo->max_v_samp_factor; 218 else 219 cinfo->rec_outbuf_height = 1; 220} 221 222 223/* 224 * Several decompression processes need to range-limit values to the range 225 * 0..MAXJSAMPLE; the input value may fall somewhat outside this range 226 * due to noise introduced by quantization, roundoff error, etc. These 227 * processes are inner loops and need to be as fast as possible. On most 228 * machines, particularly CPUs with pipelines or instruction prefetch, 229 * a (subscript-check-less) C table lookup 230 * x = sample_range_limit[x]; 231 * is faster than explicit tests 232 * if (x < 0) x = 0; 233 * else if (x > MAXJSAMPLE) x = MAXJSAMPLE; 234 * These processes all use a common table prepared by the routine below. 235 * 236 * For most steps we can mathematically guarantee that the initial value 237 * of x is within MAXJSAMPLE+1 of the legal range, so a table running from 238 * -(MAXJSAMPLE+1) to 2*MAXJSAMPLE+1 is sufficient. But for the initial 239 * limiting step (just after the IDCT), a wildly out-of-range value is 240 * possible if the input data is corrupt. To avoid any chance of indexing 241 * off the end of memory and getting a bad-pointer trap, we perform the 242 * post-IDCT limiting thus: 243 * x = range_limit[x & MASK]; 244 * where MASK is 2 bits wider than legal sample data, ie 10 bits for 8-bit 245 * samples. Under normal circumstances this is more than enough range and 246 * a correct output will be generated; with bogus input data the mask will 247 * cause wraparound, and we will safely generate a bogus-but-in-range output. 248 * For the post-IDCT step, we want to convert the data from signed to unsigned 249 * representation by adding CENTERJSAMPLE at the same time that we limit it. 250 * So the post-IDCT limiting table ends up looking like this: 251 * CENTERJSAMPLE,CENTERJSAMPLE+1,...,MAXJSAMPLE, 252 * MAXJSAMPLE (repeat 2*(MAXJSAMPLE+1)-CENTERJSAMPLE times), 253 * 0 (repeat 2*(MAXJSAMPLE+1)-CENTERJSAMPLE times), 254 * 0,1,...,CENTERJSAMPLE-1 255 * Negative inputs select values from the upper half of the table after 256 * masking. 257 * 258 * We can save some space by overlapping the start of the post-IDCT table 259 * with the simpler range limiting table. The post-IDCT table begins at 260 * sample_range_limit + CENTERJSAMPLE. 261 * 262 * Note that the table is allocated in near data space on PCs; it's small 263 * enough and used often enough to justify this. 264 */ 265 266LOCAL(void) 267prepare_range_limit_table (j_decompress_ptr cinfo) 268/* Allocate and fill in the sample_range_limit table */ 269{ 270 JSAMPLE * table; 271 int i; 272 273 table = (JSAMPLE *) 274 (*cinfo->mem->alloc_small) ((j_common_ptr) cinfo, JPOOL_IMAGE, 275 (5 * (MAXJSAMPLE+1) + CENTERJSAMPLE) * SIZEOF(JSAMPLE)); 276 table += (MAXJSAMPLE+1); /* allow negative subscripts of simple table */ 277 cinfo->sample_range_limit = table; 278 /* First segment of "simple" table: limit[x] = 0 for x < 0 */ 279 MEMZERO(table - (MAXJSAMPLE+1), (MAXJSAMPLE+1) * SIZEOF(JSAMPLE)); 280 /* Main part of "simple" table: limit[x] = x */ 281 for (i = 0; i <= MAXJSAMPLE; i++) 282 table[i] = (JSAMPLE) i; 283 table += CENTERJSAMPLE; /* Point to where post-IDCT table starts */ 284 /* End of simple table, rest of first half of post-IDCT table */ 285 for (i = CENTERJSAMPLE; i < 2*(MAXJSAMPLE+1); i++) 286 table[i] = MAXJSAMPLE; 287 /* Second half of post-IDCT table */ 288 MEMZERO(table + (2 * (MAXJSAMPLE+1)), 289 (2 * (MAXJSAMPLE+1) - CENTERJSAMPLE) * SIZEOF(JSAMPLE)); 290 MEMCOPY(table + (4 * (MAXJSAMPLE+1) - CENTERJSAMPLE), 291 cinfo->sample_range_limit, CENTERJSAMPLE * SIZEOF(JSAMPLE)); 292} 293 294 295/* 296 * Master selection of decompression modules. 297 * This is done once at jpeg_start_decompress time. We determine 298 * which modules will be used and give them appropriate initialization calls. 299 * We also initialize the decompressor input side to begin consuming data. 300 * 301 * Since jpeg_read_header has finished, we know what is in the SOF 302 * and (first) SOS markers. We also have all the application parameter 303 * settings. 304 */ 305 306LOCAL(void) 307master_selection (j_decompress_ptr cinfo) 308{ 309 my_master_ptr master = (my_master_ptr) cinfo->master; 310 boolean use_c_buffer; 311 long samplesperrow; 312 JDIMENSION jd_samplesperrow; 313 314 /* Initialize dimensions and other stuff */ 315 jpeg_calc_output_dimensions(cinfo); 316 prepare_range_limit_table(cinfo); 317 318 /* Width of an output scanline must be representable as JDIMENSION. */ 319 samplesperrow = (long) cinfo->output_width * (long) cinfo->out_color_components; 320 jd_samplesperrow = (JDIMENSION) samplesperrow; 321 if ((long) jd_samplesperrow != samplesperrow) 322 ERREXIT(cinfo, JERR_WIDTH_OVERFLOW); 323 324 /* Initialize my private state */ 325 master->pass_number = 0; 326 master->using_merged_upsample = use_merged_upsample(cinfo); 327 328 /* Color quantizer selection */ 329 master->quantizer_1pass = NULL; 330 master->quantizer_2pass = NULL; 331 /* No mode changes if not using buffered-image mode. */ 332 if (! cinfo->quantize_colors || ! cinfo->buffered_image) { 333 cinfo->enable_1pass_quant = FALSE; 334 cinfo->enable_external_quant = FALSE; 335 cinfo->enable_2pass_quant = FALSE; 336 } 337 if (cinfo->quantize_colors) { 338 if (cinfo->raw_data_out) 339 ERREXIT(cinfo, JERR_NOTIMPL); 340 /* 2-pass quantizer only works in 3-component color space. */ 341 if (cinfo->out_color_components != 3) { 342 cinfo->enable_1pass_quant = TRUE; 343 cinfo->enable_external_quant = FALSE; 344 cinfo->enable_2pass_quant = FALSE; 345 cinfo->colormap = NULL; 346 } else if (cinfo->colormap != NULL) { 347 cinfo->enable_external_quant = TRUE; 348 } else if (cinfo->two_pass_quantize) { 349 cinfo->enable_2pass_quant = TRUE; 350 } else { 351 cinfo->enable_1pass_quant = TRUE; 352 } 353 354 if (cinfo->enable_1pass_quant) { 355#ifdef QUANT_1PASS_SUPPORTED 356 jinit_1pass_quantizer(cinfo); 357 master->quantizer_1pass = cinfo->cquantize; 358#else 359 ERREXIT(cinfo, JERR_NOT_COMPILED); 360#endif 361 } 362 363 /* We use the 2-pass code to map to external colormaps. */ 364 if (cinfo->enable_2pass_quant || cinfo->enable_external_quant) { 365#ifdef QUANT_2PASS_SUPPORTED 366 jinit_2pass_quantizer(cinfo); 367 master->quantizer_2pass = cinfo->cquantize; 368#else 369 ERREXIT(cinfo, JERR_NOT_COMPILED); 370#endif 371 } 372 /* If both quantizers are initialized, the 2-pass one is left active; 373 * this is necessary for starting with quantization to an external map. 374 */ 375 } 376 377 /* Post-processing: in particular, color conversion first */ 378 if (! cinfo->raw_data_out) { 379 if (master->using_merged_upsample) { 380#ifdef UPSAMPLE_MERGING_SUPPORTED 381 jinit_merged_upsampler(cinfo); /* does color conversion too */ 382#else 383 ERREXIT(cinfo, JERR_NOT_COMPILED); 384#endif 385 } else { 386 jinit_color_deconverter(cinfo); 387 jinit_upsampler(cinfo); 388 } 389 jinit_d_post_controller(cinfo, cinfo->enable_2pass_quant); 390 } 391 /* Inverse DCT */ 392 jinit_inverse_dct(cinfo); 393 /* Entropy decoding: either Huffman or arithmetic coding. */ 394 if (cinfo->arith_code) { 395 ERREXIT(cinfo, JERR_ARITH_NOTIMPL); 396 } else { 397 if (cinfo->progressive_mode) { 398#ifdef D_PROGRESSIVE_SUPPORTED 399 jinit_phuff_decoder(cinfo); 400#else 401 ERREXIT(cinfo, JERR_NOT_COMPILED); 402#endif 403 } else 404 jinit_huff_decoder(cinfo); 405 } 406 407 /* Initialize principal buffer controllers. */ 408 use_c_buffer = cinfo->inputctl->has_multiple_scans || cinfo->buffered_image; 409 jinit_d_coef_controller(cinfo, use_c_buffer); 410 411 if (! cinfo->raw_data_out) 412 jinit_d_main_controller(cinfo, FALSE /* never need full buffer here */); 413 414 /* We can now tell the memory manager to allocate virtual arrays. */ 415 (*cinfo->mem->realize_virt_arrays) ((j_common_ptr) cinfo); 416 417 /* Initialize input side of decompressor to consume first scan. */ 418 (*cinfo->inputctl->start_input_pass) (cinfo); 419 420#ifdef D_MULTISCAN_FILES_SUPPORTED 421 /* If jpeg_start_decompress will read the whole file, initialize 422 * progress monitoring appropriately. The input step is counted 423 * as one pass. 424 */ 425 if (cinfo->progress != NULL && ! cinfo->buffered_image && 426 cinfo->inputctl->has_multiple_scans) { 427 int nscans; 428 /* Estimate number of scans to set pass_limit. */ 429 if (cinfo->progressive_mode) { 430 /* Arbitrarily estimate 2 interleaved DC scans + 3 AC scans/component. */ 431 nscans = 2 + 3 * cinfo->num_components; 432 } else { 433 /* For a nonprogressive multiscan file, estimate 1 scan per component. */ 434 nscans = cinfo->num_components; 435 } 436 cinfo->progress->pass_counter = 0L; 437 cinfo->progress->pass_limit = (long) cinfo->total_iMCU_rows * nscans; 438 cinfo->progress->completed_passes = 0; 439 cinfo->progress->total_passes = (cinfo->enable_2pass_quant ? 3 : 2); 440 /* Count the input pass as done */ 441 master->pass_number++; 442 } 443#endif /* D_MULTISCAN_FILES_SUPPORTED */ 444} 445 446 447/* 448 * Per-pass setup. 449 * This is called at the beginning of each output pass. We determine which 450 * modules will be active during this pass and give them appropriate 451 * start_pass calls. We also set is_dummy_pass to indicate whether this 452 * is a "real" output pass or a dummy pass for color quantization. 453 * (In the latter case, jdapistd.c will crank the pass to completion.) 454 */ 455 456METHODDEF(void) 457prepare_for_output_pass (j_decompress_ptr cinfo) 458{ 459 my_master_ptr master = (my_master_ptr) cinfo->master; 460 461 if (master->pub.is_dummy_pass) { 462#ifdef QUANT_2PASS_SUPPORTED 463 /* Final pass of 2-pass quantization */ 464 master->pub.is_dummy_pass = FALSE; 465 (*cinfo->cquantize->start_pass) (cinfo, FALSE); 466 (*cinfo->post->start_pass) (cinfo, JBUF_CRANK_DEST); 467 (*cinfo->main->start_pass) (cinfo, JBUF_CRANK_DEST); 468#else 469 ERREXIT(cinfo, JERR_NOT_COMPILED); 470#endif /* QUANT_2PASS_SUPPORTED */ 471 } else { 472 if (cinfo->quantize_colors && cinfo->colormap == NULL) { 473 /* Select new quantization method */ 474 if (cinfo->two_pass_quantize && cinfo->enable_2pass_quant) { 475 cinfo->cquantize = master->quantizer_2pass; 476 master->pub.is_dummy_pass = TRUE; 477 } else if (cinfo->enable_1pass_quant) { 478 cinfo->cquantize = master->quantizer_1pass; 479 } else { 480 ERREXIT(cinfo, JERR_MODE_CHANGE); 481 } 482 } 483 (*cinfo->idct->start_pass) (cinfo); 484 (*cinfo->coef->start_output_pass) (cinfo); 485 if (! cinfo->raw_data_out) { 486 if (! master->using_merged_upsample) 487 (*cinfo->cconvert->start_pass) (cinfo); 488 (*cinfo->upsample->start_pass) (cinfo); 489 if (cinfo->quantize_colors) 490 (*cinfo->cquantize->start_pass) (cinfo, master->pub.is_dummy_pass); 491 (*cinfo->post->start_pass) (cinfo, 492 (master->pub.is_dummy_pass ? JBUF_SAVE_AND_PASS : JBUF_PASS_THRU)); 493 (*cinfo->main->start_pass) (cinfo, JBUF_PASS_THRU); 494 } 495 } 496 497 /* Set up progress monitor's pass info if present */ 498 if (cinfo->progress != NULL) { 499 cinfo->progress->completed_passes = master->pass_number; 500 cinfo->progress->total_passes = master->pass_number + 501 (master->pub.is_dummy_pass ? 2 : 1); 502 /* In buffered-image mode, we assume one more output pass if EOI not 503 * yet reached, but no more passes if EOI has been reached. 504 */ 505 if (cinfo->buffered_image && ! cinfo->inputctl->eoi_reached) { 506 cinfo->progress->total_passes += (cinfo->enable_2pass_quant ? 2 : 1); 507 } 508 } 509} 510 511 512/* 513 * Finish up at end of an output pass. 514 */ 515 516METHODDEF(void) 517finish_output_pass (j_decompress_ptr cinfo) 518{ 519 my_master_ptr master = (my_master_ptr) cinfo->master; 520 521 if (cinfo->quantize_colors) 522 (*cinfo->cquantize->finish_pass) (cinfo); 523 master->pass_number++; 524} 525 526 527#ifdef D_MULTISCAN_FILES_SUPPORTED 528 529/* 530 * Switch to a new external colormap between output passes. 531 */ 532 533GLOBAL(void) 534jpeg_new_colormap (j_decompress_ptr cinfo) 535{ 536 my_master_ptr master = (my_master_ptr) cinfo->master; 537 538 /* Prevent application from calling me at wrong times */ 539 if (cinfo->global_state != DSTATE_BUFIMAGE) 540 ERREXIT1(cinfo, JERR_BAD_STATE, cinfo->global_state); 541 542 if (cinfo->quantize_colors && cinfo->enable_external_quant && 543 cinfo->colormap != NULL) { 544 /* Select 2-pass quantizer for external colormap use */ 545 cinfo->cquantize = master->quantizer_2pass; 546 /* Notify quantizer of colormap change */ 547 (*cinfo->cquantize->new_color_map) (cinfo); 548 master->pub.is_dummy_pass = FALSE; /* just in case */ 549 } else 550 ERREXIT(cinfo, JERR_MODE_CHANGE); 551} 552 553#endif /* D_MULTISCAN_FILES_SUPPORTED */ 554 555 556/* 557 * Initialize master decompression control and select active modules. 558 * This is performed at the start of jpeg_start_decompress. 559 */ 560 561GLOBAL(void) 562jinit_master_decompress (j_decompress_ptr cinfo) 563{ 564 my_master_ptr master; 565 566 master = (my_master_ptr) 567 (*cinfo->mem->alloc_small) ((j_common_ptr) cinfo, JPOOL_IMAGE, 568 SIZEOF(my_decomp_master)); 569 cinfo->master = (struct jpeg_decomp_master *) master; 570 master->pub.prepare_for_output_pass = prepare_for_output_pass; 571 master->pub.finish_output_pass = finish_output_pass; 572 573 master->pub.is_dummy_pass = FALSE; 574 575 master_selection(cinfo); 576} 577