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annotate libs/libjpeg/jcmaster.c @ 39:ff055bff6a15

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author John Tsiombikas <nuclear@mutantstargoat.com>
date Sun, 11 Sep 2011 09:03:18 +0300
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nuclear@26 1 /*
nuclear@26 2 * jcmaster.c
nuclear@26 3 *
nuclear@26 4 * Copyright (C) 1991-1997, Thomas G. Lane.
nuclear@26 5 * This file is part of the Independent JPEG Group's software.
nuclear@26 6 * For conditions of distribution and use, see the accompanying README file.
nuclear@26 7 *
nuclear@26 8 * This file contains master control logic for the JPEG compressor.
nuclear@26 9 * These routines are concerned with parameter validation, initial setup,
nuclear@26 10 * and inter-pass control (determining the number of passes and the work
nuclear@26 11 * to be done in each pass).
nuclear@26 12 */
nuclear@26 13
nuclear@26 14 #define JPEG_INTERNALS
nuclear@26 15 #include "jinclude.h"
nuclear@26 16 #include "jpeglib.h"
nuclear@26 17
nuclear@26 18
nuclear@26 19 /* Private state */
nuclear@26 20
nuclear@26 21 typedef enum {
nuclear@26 22 main_pass, /* input data, also do first output step */
nuclear@26 23 huff_opt_pass, /* Huffman code optimization pass */
nuclear@26 24 output_pass /* data output pass */
nuclear@26 25 } c_pass_type;
nuclear@26 26
nuclear@26 27 typedef struct {
nuclear@26 28 struct jpeg_comp_master pub; /* public fields */
nuclear@26 29
nuclear@26 30 c_pass_type pass_type; /* the type of the current pass */
nuclear@26 31
nuclear@26 32 int pass_number; /* # of passes completed */
nuclear@26 33 int total_passes; /* total # of passes needed */
nuclear@26 34
nuclear@26 35 int scan_number; /* current index in scan_info[] */
nuclear@26 36 } my_comp_master;
nuclear@26 37
nuclear@26 38 typedef my_comp_master * my_master_ptr;
nuclear@26 39
nuclear@26 40
nuclear@26 41 /*
nuclear@26 42 * Support routines that do various essential calculations.
nuclear@26 43 */
nuclear@26 44
nuclear@26 45 LOCAL(void)
nuclear@26 46 initial_setup (j_compress_ptr cinfo)
nuclear@26 47 /* Do computations that are needed before master selection phase */
nuclear@26 48 {
nuclear@26 49 int ci;
nuclear@26 50 jpeg_component_info *compptr;
nuclear@26 51 long samplesperrow;
nuclear@26 52 JDIMENSION jd_samplesperrow;
nuclear@26 53
nuclear@26 54 /* Sanity check on image dimensions */
nuclear@26 55 if (cinfo->image_height <= 0 || cinfo->image_width <= 0
nuclear@26 56 || cinfo->num_components <= 0 || cinfo->input_components <= 0)
nuclear@26 57 ERREXIT(cinfo, JERR_EMPTY_IMAGE);
nuclear@26 58
nuclear@26 59 /* Make sure image isn't bigger than I can handle */
nuclear@26 60 if ((long) cinfo->image_height > (long) JPEG_MAX_DIMENSION ||
nuclear@26 61 (long) cinfo->image_width > (long) JPEG_MAX_DIMENSION)
nuclear@26 62 ERREXIT1(cinfo, JERR_IMAGE_TOO_BIG, (unsigned int) JPEG_MAX_DIMENSION);
nuclear@26 63
nuclear@26 64 /* Width of an input scanline must be representable as JDIMENSION. */
nuclear@26 65 samplesperrow = (long) cinfo->image_width * (long) cinfo->input_components;
nuclear@26 66 jd_samplesperrow = (JDIMENSION) samplesperrow;
nuclear@26 67 if ((long) jd_samplesperrow != samplesperrow)
nuclear@26 68 ERREXIT(cinfo, JERR_WIDTH_OVERFLOW);
nuclear@26 69
nuclear@26 70 /* For now, precision must match compiled-in value... */
nuclear@26 71 if (cinfo->data_precision != BITS_IN_JSAMPLE)
nuclear@26 72 ERREXIT1(cinfo, JERR_BAD_PRECISION, cinfo->data_precision);
nuclear@26 73
nuclear@26 74 /* Check that number of components won't exceed internal array sizes */
nuclear@26 75 if (cinfo->num_components > MAX_COMPONENTS)
nuclear@26 76 ERREXIT2(cinfo, JERR_COMPONENT_COUNT, cinfo->num_components,
nuclear@26 77 MAX_COMPONENTS);
nuclear@26 78
nuclear@26 79 /* Compute maximum sampling factors; check factor validity */
nuclear@26 80 cinfo->max_h_samp_factor = 1;
nuclear@26 81 cinfo->max_v_samp_factor = 1;
nuclear@26 82 for (ci = 0, compptr = cinfo->comp_info; ci < cinfo->num_components;
nuclear@26 83 ci++, compptr++) {
nuclear@26 84 if (compptr->h_samp_factor<=0 || compptr->h_samp_factor>MAX_SAMP_FACTOR ||
nuclear@26 85 compptr->v_samp_factor<=0 || compptr->v_samp_factor>MAX_SAMP_FACTOR)
nuclear@26 86 ERREXIT(cinfo, JERR_BAD_SAMPLING);
nuclear@26 87 cinfo->max_h_samp_factor = MAX(cinfo->max_h_samp_factor,
nuclear@26 88 compptr->h_samp_factor);
nuclear@26 89 cinfo->max_v_samp_factor = MAX(cinfo->max_v_samp_factor,
nuclear@26 90 compptr->v_samp_factor);
nuclear@26 91 }
nuclear@26 92
nuclear@26 93 /* Compute dimensions of components */
nuclear@26 94 for (ci = 0, compptr = cinfo->comp_info; ci < cinfo->num_components;
nuclear@26 95 ci++, compptr++) {
nuclear@26 96 /* Fill in the correct component_index value; don't rely on application */
nuclear@26 97 compptr->component_index = ci;
nuclear@26 98 /* For compression, we never do DCT scaling. */
nuclear@26 99 compptr->DCT_scaled_size = DCTSIZE;
nuclear@26 100 /* Size in DCT blocks */
nuclear@26 101 compptr->width_in_blocks = (JDIMENSION)
nuclear@26 102 jdiv_round_up((long) cinfo->image_width * (long) compptr->h_samp_factor,
nuclear@26 103 (long) (cinfo->max_h_samp_factor * DCTSIZE));
nuclear@26 104 compptr->height_in_blocks = (JDIMENSION)
nuclear@26 105 jdiv_round_up((long) cinfo->image_height * (long) compptr->v_samp_factor,
nuclear@26 106 (long) (cinfo->max_v_samp_factor * DCTSIZE));
nuclear@26 107 /* Size in samples */
nuclear@26 108 compptr->downsampled_width = (JDIMENSION)
nuclear@26 109 jdiv_round_up((long) cinfo->image_width * (long) compptr->h_samp_factor,
nuclear@26 110 (long) cinfo->max_h_samp_factor);
nuclear@26 111 compptr->downsampled_height = (JDIMENSION)
nuclear@26 112 jdiv_round_up((long) cinfo->image_height * (long) compptr->v_samp_factor,
nuclear@26 113 (long) cinfo->max_v_samp_factor);
nuclear@26 114 /* Mark component needed (this flag isn't actually used for compression) */
nuclear@26 115 compptr->component_needed = TRUE;
nuclear@26 116 }
nuclear@26 117
nuclear@26 118 /* Compute number of fully interleaved MCU rows (number of times that
nuclear@26 119 * main controller will call coefficient controller).
nuclear@26 120 */
nuclear@26 121 cinfo->total_iMCU_rows = (JDIMENSION)
nuclear@26 122 jdiv_round_up((long) cinfo->image_height,
nuclear@26 123 (long) (cinfo->max_v_samp_factor*DCTSIZE));
nuclear@26 124 }
nuclear@26 125
nuclear@26 126
nuclear@26 127 #ifdef C_MULTISCAN_FILES_SUPPORTED
nuclear@26 128
nuclear@26 129 LOCAL(void)
nuclear@26 130 validate_script (j_compress_ptr cinfo)
nuclear@26 131 /* Verify that the scan script in cinfo->scan_info[] is valid; also
nuclear@26 132 * determine whether it uses progressive JPEG, and set cinfo->progressive_mode.
nuclear@26 133 */
nuclear@26 134 {
nuclear@26 135 const jpeg_scan_info * scanptr;
nuclear@26 136 int scanno, ncomps, ci, coefi, thisi;
nuclear@26 137 int Ss, Se, Ah, Al;
nuclear@26 138 boolean component_sent[MAX_COMPONENTS];
nuclear@26 139 #ifdef C_PROGRESSIVE_SUPPORTED
nuclear@26 140 int * last_bitpos_ptr;
nuclear@26 141 int last_bitpos[MAX_COMPONENTS][DCTSIZE2];
nuclear@26 142 /* -1 until that coefficient has been seen; then last Al for it */
nuclear@26 143 #endif
nuclear@26 144
nuclear@26 145 if (cinfo->num_scans <= 0)
nuclear@26 146 ERREXIT1(cinfo, JERR_BAD_SCAN_SCRIPT, 0);
nuclear@26 147
nuclear@26 148 /* For sequential JPEG, all scans must have Ss=0, Se=DCTSIZE2-1;
nuclear@26 149 * for progressive JPEG, no scan can have this.
nuclear@26 150 */
nuclear@26 151 scanptr = cinfo->scan_info;
nuclear@26 152 if (scanptr->Ss != 0 || scanptr->Se != DCTSIZE2-1) {
nuclear@26 153 #ifdef C_PROGRESSIVE_SUPPORTED
nuclear@26 154 cinfo->progressive_mode = TRUE;
nuclear@26 155 last_bitpos_ptr = & last_bitpos[0][0];
nuclear@26 156 for (ci = 0; ci < cinfo->num_components; ci++)
nuclear@26 157 for (coefi = 0; coefi < DCTSIZE2; coefi++)
nuclear@26 158 *last_bitpos_ptr++ = -1;
nuclear@26 159 #else
nuclear@26 160 ERREXIT(cinfo, JERR_NOT_COMPILED);
nuclear@26 161 #endif
nuclear@26 162 } else {
nuclear@26 163 cinfo->progressive_mode = FALSE;
nuclear@26 164 for (ci = 0; ci < cinfo->num_components; ci++)
nuclear@26 165 component_sent[ci] = FALSE;
nuclear@26 166 }
nuclear@26 167
nuclear@26 168 for (scanno = 1; scanno <= cinfo->num_scans; scanptr++, scanno++) {
nuclear@26 169 /* Validate component indexes */
nuclear@26 170 ncomps = scanptr->comps_in_scan;
nuclear@26 171 if (ncomps <= 0 || ncomps > MAX_COMPS_IN_SCAN)
nuclear@26 172 ERREXIT2(cinfo, JERR_COMPONENT_COUNT, ncomps, MAX_COMPS_IN_SCAN);
nuclear@26 173 for (ci = 0; ci < ncomps; ci++) {
nuclear@26 174 thisi = scanptr->component_index[ci];
nuclear@26 175 if (thisi < 0 || thisi >= cinfo->num_components)
nuclear@26 176 ERREXIT1(cinfo, JERR_BAD_SCAN_SCRIPT, scanno);
nuclear@26 177 /* Components must appear in SOF order within each scan */
nuclear@26 178 if (ci > 0 && thisi <= scanptr->component_index[ci-1])
nuclear@26 179 ERREXIT1(cinfo, JERR_BAD_SCAN_SCRIPT, scanno);
nuclear@26 180 }
nuclear@26 181 /* Validate progression parameters */
nuclear@26 182 Ss = scanptr->Ss;
nuclear@26 183 Se = scanptr->Se;
nuclear@26 184 Ah = scanptr->Ah;
nuclear@26 185 Al = scanptr->Al;
nuclear@26 186 if (cinfo->progressive_mode) {
nuclear@26 187 #ifdef C_PROGRESSIVE_SUPPORTED
nuclear@26 188 /* The JPEG spec simply gives the ranges 0..13 for Ah and Al, but that
nuclear@26 189 * seems wrong: the upper bound ought to depend on data precision.
nuclear@26 190 * Perhaps they really meant 0..N+1 for N-bit precision.
nuclear@26 191 * Here we allow 0..10 for 8-bit data; Al larger than 10 results in
nuclear@26 192 * out-of-range reconstructed DC values during the first DC scan,
nuclear@26 193 * which might cause problems for some decoders.
nuclear@26 194 */
nuclear@26 195 #if BITS_IN_JSAMPLE == 8
nuclear@26 196 #define MAX_AH_AL 10
nuclear@26 197 #else
nuclear@26 198 #define MAX_AH_AL 13
nuclear@26 199 #endif
nuclear@26 200 if (Ss < 0 || Ss >= DCTSIZE2 || Se < Ss || Se >= DCTSIZE2 ||
nuclear@26 201 Ah < 0 || Ah > MAX_AH_AL || Al < 0 || Al > MAX_AH_AL)
nuclear@26 202 ERREXIT1(cinfo, JERR_BAD_PROG_SCRIPT, scanno);
nuclear@26 203 if (Ss == 0) {
nuclear@26 204 if (Se != 0) /* DC and AC together not OK */
nuclear@26 205 ERREXIT1(cinfo, JERR_BAD_PROG_SCRIPT, scanno);
nuclear@26 206 } else {
nuclear@26 207 if (ncomps != 1) /* AC scans must be for only one component */
nuclear@26 208 ERREXIT1(cinfo, JERR_BAD_PROG_SCRIPT, scanno);
nuclear@26 209 }
nuclear@26 210 for (ci = 0; ci < ncomps; ci++) {
nuclear@26 211 last_bitpos_ptr = & last_bitpos[scanptr->component_index[ci]][0];
nuclear@26 212 if (Ss != 0 && last_bitpos_ptr[0] < 0) /* AC without prior DC scan */
nuclear@26 213 ERREXIT1(cinfo, JERR_BAD_PROG_SCRIPT, scanno);
nuclear@26 214 for (coefi = Ss; coefi <= Se; coefi++) {
nuclear@26 215 if (last_bitpos_ptr[coefi] < 0) {
nuclear@26 216 /* first scan of this coefficient */
nuclear@26 217 if (Ah != 0)
nuclear@26 218 ERREXIT1(cinfo, JERR_BAD_PROG_SCRIPT, scanno);
nuclear@26 219 } else {
nuclear@26 220 /* not first scan */
nuclear@26 221 if (Ah != last_bitpos_ptr[coefi] || Al != Ah-1)
nuclear@26 222 ERREXIT1(cinfo, JERR_BAD_PROG_SCRIPT, scanno);
nuclear@26 223 }
nuclear@26 224 last_bitpos_ptr[coefi] = Al;
nuclear@26 225 }
nuclear@26 226 }
nuclear@26 227 #endif
nuclear@26 228 } else {
nuclear@26 229 /* For sequential JPEG, all progression parameters must be these: */
nuclear@26 230 if (Ss != 0 || Se != DCTSIZE2-1 || Ah != 0 || Al != 0)
nuclear@26 231 ERREXIT1(cinfo, JERR_BAD_PROG_SCRIPT, scanno);
nuclear@26 232 /* Make sure components are not sent twice */
nuclear@26 233 for (ci = 0; ci < ncomps; ci++) {
nuclear@26 234 thisi = scanptr->component_index[ci];
nuclear@26 235 if (component_sent[thisi])
nuclear@26 236 ERREXIT1(cinfo, JERR_BAD_SCAN_SCRIPT, scanno);
nuclear@26 237 component_sent[thisi] = TRUE;
nuclear@26 238 }
nuclear@26 239 }
nuclear@26 240 }
nuclear@26 241
nuclear@26 242 /* Now verify that everything got sent. */
nuclear@26 243 if (cinfo->progressive_mode) {
nuclear@26 244 #ifdef C_PROGRESSIVE_SUPPORTED
nuclear@26 245 /* For progressive mode, we only check that at least some DC data
nuclear@26 246 * got sent for each component; the spec does not require that all bits
nuclear@26 247 * of all coefficients be transmitted. Would it be wiser to enforce
nuclear@26 248 * transmission of all coefficient bits??
nuclear@26 249 */
nuclear@26 250 for (ci = 0; ci < cinfo->num_components; ci++) {
nuclear@26 251 if (last_bitpos[ci][0] < 0)
nuclear@26 252 ERREXIT(cinfo, JERR_MISSING_DATA);
nuclear@26 253 }
nuclear@26 254 #endif
nuclear@26 255 } else {
nuclear@26 256 for (ci = 0; ci < cinfo->num_components; ci++) {
nuclear@26 257 if (! component_sent[ci])
nuclear@26 258 ERREXIT(cinfo, JERR_MISSING_DATA);
nuclear@26 259 }
nuclear@26 260 }
nuclear@26 261 }
nuclear@26 262
nuclear@26 263 #endif /* C_MULTISCAN_FILES_SUPPORTED */
nuclear@26 264
nuclear@26 265
nuclear@26 266 LOCAL(void)
nuclear@26 267 select_scan_parameters (j_compress_ptr cinfo)
nuclear@26 268 /* Set up the scan parameters for the current scan */
nuclear@26 269 {
nuclear@26 270 int ci;
nuclear@26 271
nuclear@26 272 #ifdef C_MULTISCAN_FILES_SUPPORTED
nuclear@26 273 if (cinfo->scan_info != NULL) {
nuclear@26 274 /* Prepare for current scan --- the script is already validated */
nuclear@26 275 my_master_ptr master = (my_master_ptr) cinfo->master;
nuclear@26 276 const jpeg_scan_info * scanptr = cinfo->scan_info + master->scan_number;
nuclear@26 277
nuclear@26 278 cinfo->comps_in_scan = scanptr->comps_in_scan;
nuclear@26 279 for (ci = 0; ci < scanptr->comps_in_scan; ci++) {
nuclear@26 280 cinfo->cur_comp_info[ci] =
nuclear@26 281 &cinfo->comp_info[scanptr->component_index[ci]];
nuclear@26 282 }
nuclear@26 283 cinfo->Ss = scanptr->Ss;
nuclear@26 284 cinfo->Se = scanptr->Se;
nuclear@26 285 cinfo->Ah = scanptr->Ah;
nuclear@26 286 cinfo->Al = scanptr->Al;
nuclear@26 287 }
nuclear@26 288 else
nuclear@26 289 #endif
nuclear@26 290 {
nuclear@26 291 /* Prepare for single sequential-JPEG scan containing all components */
nuclear@26 292 if (cinfo->num_components > MAX_COMPS_IN_SCAN)
nuclear@26 293 ERREXIT2(cinfo, JERR_COMPONENT_COUNT, cinfo->num_components,
nuclear@26 294 MAX_COMPS_IN_SCAN);
nuclear@26 295 cinfo->comps_in_scan = cinfo->num_components;
nuclear@26 296 for (ci = 0; ci < cinfo->num_components; ci++) {
nuclear@26 297 cinfo->cur_comp_info[ci] = &cinfo->comp_info[ci];
nuclear@26 298 }
nuclear@26 299 cinfo->Ss = 0;
nuclear@26 300 cinfo->Se = DCTSIZE2-1;
nuclear@26 301 cinfo->Ah = 0;
nuclear@26 302 cinfo->Al = 0;
nuclear@26 303 }
nuclear@26 304 }
nuclear@26 305
nuclear@26 306
nuclear@26 307 LOCAL(void)
nuclear@26 308 per_scan_setup (j_compress_ptr cinfo)
nuclear@26 309 /* Do computations that are needed before processing a JPEG scan */
nuclear@26 310 /* cinfo->comps_in_scan and cinfo->cur_comp_info[] are already set */
nuclear@26 311 {
nuclear@26 312 int ci, mcublks, tmp;
nuclear@26 313 jpeg_component_info *compptr;
nuclear@26 314
nuclear@26 315 if (cinfo->comps_in_scan == 1) {
nuclear@26 316
nuclear@26 317 /* Noninterleaved (single-component) scan */
nuclear@26 318 compptr = cinfo->cur_comp_info[0];
nuclear@26 319
nuclear@26 320 /* Overall image size in MCUs */
nuclear@26 321 cinfo->MCUs_per_row = compptr->width_in_blocks;
nuclear@26 322 cinfo->MCU_rows_in_scan = compptr->height_in_blocks;
nuclear@26 323
nuclear@26 324 /* For noninterleaved scan, always one block per MCU */
nuclear@26 325 compptr->MCU_width = 1;
nuclear@26 326 compptr->MCU_height = 1;
nuclear@26 327 compptr->MCU_blocks = 1;
nuclear@26 328 compptr->MCU_sample_width = DCTSIZE;
nuclear@26 329 compptr->last_col_width = 1;
nuclear@26 330 /* For noninterleaved scans, it is convenient to define last_row_height
nuclear@26 331 * as the number of block rows present in the last iMCU row.
nuclear@26 332 */
nuclear@26 333 tmp = (int) (compptr->height_in_blocks % compptr->v_samp_factor);
nuclear@26 334 if (tmp == 0) tmp = compptr->v_samp_factor;
nuclear@26 335 compptr->last_row_height = tmp;
nuclear@26 336
nuclear@26 337 /* Prepare array describing MCU composition */
nuclear@26 338 cinfo->blocks_in_MCU = 1;
nuclear@26 339 cinfo->MCU_membership[0] = 0;
nuclear@26 340
nuclear@26 341 } else {
nuclear@26 342
nuclear@26 343 /* Interleaved (multi-component) scan */
nuclear@26 344 if (cinfo->comps_in_scan <= 0 || cinfo->comps_in_scan > MAX_COMPS_IN_SCAN)
nuclear@26 345 ERREXIT2(cinfo, JERR_COMPONENT_COUNT, cinfo->comps_in_scan,
nuclear@26 346 MAX_COMPS_IN_SCAN);
nuclear@26 347
nuclear@26 348 /* Overall image size in MCUs */
nuclear@26 349 cinfo->MCUs_per_row = (JDIMENSION)
nuclear@26 350 jdiv_round_up((long) cinfo->image_width,
nuclear@26 351 (long) (cinfo->max_h_samp_factor*DCTSIZE));
nuclear@26 352 cinfo->MCU_rows_in_scan = (JDIMENSION)
nuclear@26 353 jdiv_round_up((long) cinfo->image_height,
nuclear@26 354 (long) (cinfo->max_v_samp_factor*DCTSIZE));
nuclear@26 355
nuclear@26 356 cinfo->blocks_in_MCU = 0;
nuclear@26 357
nuclear@26 358 for (ci = 0; ci < cinfo->comps_in_scan; ci++) {
nuclear@26 359 compptr = cinfo->cur_comp_info[ci];
nuclear@26 360 /* Sampling factors give # of blocks of component in each MCU */
nuclear@26 361 compptr->MCU_width = compptr->h_samp_factor;
nuclear@26 362 compptr->MCU_height = compptr->v_samp_factor;
nuclear@26 363 compptr->MCU_blocks = compptr->MCU_width * compptr->MCU_height;
nuclear@26 364 compptr->MCU_sample_width = compptr->MCU_width * DCTSIZE;
nuclear@26 365 /* Figure number of non-dummy blocks in last MCU column & row */
nuclear@26 366 tmp = (int) (compptr->width_in_blocks % compptr->MCU_width);
nuclear@26 367 if (tmp == 0) tmp = compptr->MCU_width;
nuclear@26 368 compptr->last_col_width = tmp;
nuclear@26 369 tmp = (int) (compptr->height_in_blocks % compptr->MCU_height);
nuclear@26 370 if (tmp == 0) tmp = compptr->MCU_height;
nuclear@26 371 compptr->last_row_height = tmp;
nuclear@26 372 /* Prepare array describing MCU composition */
nuclear@26 373 mcublks = compptr->MCU_blocks;
nuclear@26 374 if (cinfo->blocks_in_MCU + mcublks > C_MAX_BLOCKS_IN_MCU)
nuclear@26 375 ERREXIT(cinfo, JERR_BAD_MCU_SIZE);
nuclear@26 376 while (mcublks-- > 0) {
nuclear@26 377 cinfo->MCU_membership[cinfo->blocks_in_MCU++] = ci;
nuclear@26 378 }
nuclear@26 379 }
nuclear@26 380
nuclear@26 381 }
nuclear@26 382
nuclear@26 383 /* Convert restart specified in rows to actual MCU count. */
nuclear@26 384 /* Note that count must fit in 16 bits, so we provide limiting. */
nuclear@26 385 if (cinfo->restart_in_rows > 0) {
nuclear@26 386 long nominal = (long) cinfo->restart_in_rows * (long) cinfo->MCUs_per_row;
nuclear@26 387 cinfo->restart_interval = (unsigned int) MIN(nominal, 65535L);
nuclear@26 388 }
nuclear@26 389 }
nuclear@26 390
nuclear@26 391
nuclear@26 392 /*
nuclear@26 393 * Per-pass setup.
nuclear@26 394 * This is called at the beginning of each pass. We determine which modules
nuclear@26 395 * will be active during this pass and give them appropriate start_pass calls.
nuclear@26 396 * We also set is_last_pass to indicate whether any more passes will be
nuclear@26 397 * required.
nuclear@26 398 */
nuclear@26 399
nuclear@26 400 METHODDEF(void)
nuclear@26 401 prepare_for_pass (j_compress_ptr cinfo)
nuclear@26 402 {
nuclear@26 403 my_master_ptr master = (my_master_ptr) cinfo->master;
nuclear@26 404
nuclear@26 405 switch (master->pass_type) {
nuclear@26 406 case main_pass:
nuclear@26 407 /* Initial pass: will collect input data, and do either Huffman
nuclear@26 408 * optimization or data output for the first scan.
nuclear@26 409 */
nuclear@26 410 select_scan_parameters(cinfo);
nuclear@26 411 per_scan_setup(cinfo);
nuclear@26 412 if (! cinfo->raw_data_in) {
nuclear@26 413 (*cinfo->cconvert->start_pass) (cinfo);
nuclear@26 414 (*cinfo->downsample->start_pass) (cinfo);
nuclear@26 415 (*cinfo->prep->start_pass) (cinfo, JBUF_PASS_THRU);
nuclear@26 416 }
nuclear@26 417 (*cinfo->fdct->start_pass) (cinfo);
nuclear@26 418 (*cinfo->entropy->start_pass) (cinfo, cinfo->optimize_coding);
nuclear@26 419 (*cinfo->coef->start_pass) (cinfo,
nuclear@26 420 (master->total_passes > 1 ?
nuclear@26 421 JBUF_SAVE_AND_PASS : JBUF_PASS_THRU));
nuclear@26 422 (*cinfo->main->start_pass) (cinfo, JBUF_PASS_THRU);
nuclear@26 423 if (cinfo->optimize_coding) {
nuclear@26 424 /* No immediate data output; postpone writing frame/scan headers */
nuclear@26 425 master->pub.call_pass_startup = FALSE;
nuclear@26 426 } else {
nuclear@26 427 /* Will write frame/scan headers at first jpeg_write_scanlines call */
nuclear@26 428 master->pub.call_pass_startup = TRUE;
nuclear@26 429 }
nuclear@26 430 break;
nuclear@26 431 #ifdef ENTROPY_OPT_SUPPORTED
nuclear@26 432 case huff_opt_pass:
nuclear@26 433 /* Do Huffman optimization for a scan after the first one. */
nuclear@26 434 select_scan_parameters(cinfo);
nuclear@26 435 per_scan_setup(cinfo);
nuclear@26 436 if (cinfo->Ss != 0 || cinfo->Ah == 0 || cinfo->arith_code) {
nuclear@26 437 (*cinfo->entropy->start_pass) (cinfo, TRUE);
nuclear@26 438 (*cinfo->coef->start_pass) (cinfo, JBUF_CRANK_DEST);
nuclear@26 439 master->pub.call_pass_startup = FALSE;
nuclear@26 440 break;
nuclear@26 441 }
nuclear@26 442 /* Special case: Huffman DC refinement scans need no Huffman table
nuclear@26 443 * and therefore we can skip the optimization pass for them.
nuclear@26 444 */
nuclear@26 445 master->pass_type = output_pass;
nuclear@26 446 master->pass_number++;
nuclear@26 447 /*FALLTHROUGH*/
nuclear@26 448 #endif
nuclear@26 449 case output_pass:
nuclear@26 450 /* Do a data-output pass. */
nuclear@26 451 /* We need not repeat per-scan setup if prior optimization pass did it. */
nuclear@26 452 if (! cinfo->optimize_coding) {
nuclear@26 453 select_scan_parameters(cinfo);
nuclear@26 454 per_scan_setup(cinfo);
nuclear@26 455 }
nuclear@26 456 (*cinfo->entropy->start_pass) (cinfo, FALSE);
nuclear@26 457 (*cinfo->coef->start_pass) (cinfo, JBUF_CRANK_DEST);
nuclear@26 458 /* We emit frame/scan headers now */
nuclear@26 459 if (master->scan_number == 0)
nuclear@26 460 (*cinfo->marker->write_frame_header) (cinfo);
nuclear@26 461 (*cinfo->marker->write_scan_header) (cinfo);
nuclear@26 462 master->pub.call_pass_startup = FALSE;
nuclear@26 463 break;
nuclear@26 464 default:
nuclear@26 465 ERREXIT(cinfo, JERR_NOT_COMPILED);
nuclear@26 466 }
nuclear@26 467
nuclear@26 468 master->pub.is_last_pass = (master->pass_number == master->total_passes-1);
nuclear@26 469
nuclear@26 470 /* Set up progress monitor's pass info if present */
nuclear@26 471 if (cinfo->progress != NULL) {
nuclear@26 472 cinfo->progress->completed_passes = master->pass_number;
nuclear@26 473 cinfo->progress->total_passes = master->total_passes;
nuclear@26 474 }
nuclear@26 475 }
nuclear@26 476
nuclear@26 477
nuclear@26 478 /*
nuclear@26 479 * Special start-of-pass hook.
nuclear@26 480 * This is called by jpeg_write_scanlines if call_pass_startup is TRUE.
nuclear@26 481 * In single-pass processing, we need this hook because we don't want to
nuclear@26 482 * write frame/scan headers during jpeg_start_compress; we want to let the
nuclear@26 483 * application write COM markers etc. between jpeg_start_compress and the
nuclear@26 484 * jpeg_write_scanlines loop.
nuclear@26 485 * In multi-pass processing, this routine is not used.
nuclear@26 486 */
nuclear@26 487
nuclear@26 488 METHODDEF(void)
nuclear@26 489 pass_startup (j_compress_ptr cinfo)
nuclear@26 490 {
nuclear@26 491 cinfo->master->call_pass_startup = FALSE; /* reset flag so call only once */
nuclear@26 492
nuclear@26 493 (*cinfo->marker->write_frame_header) (cinfo);
nuclear@26 494 (*cinfo->marker->write_scan_header) (cinfo);
nuclear@26 495 }
nuclear@26 496
nuclear@26 497
nuclear@26 498 /*
nuclear@26 499 * Finish up at end of pass.
nuclear@26 500 */
nuclear@26 501
nuclear@26 502 METHODDEF(void)
nuclear@26 503 finish_pass_master (j_compress_ptr cinfo)
nuclear@26 504 {
nuclear@26 505 my_master_ptr master = (my_master_ptr) cinfo->master;
nuclear@26 506
nuclear@26 507 /* The entropy coder always needs an end-of-pass call,
nuclear@26 508 * either to analyze statistics or to flush its output buffer.
nuclear@26 509 */
nuclear@26 510 (*cinfo->entropy->finish_pass) (cinfo);
nuclear@26 511
nuclear@26 512 /* Update state for next pass */
nuclear@26 513 switch (master->pass_type) {
nuclear@26 514 case main_pass:
nuclear@26 515 /* next pass is either output of scan 0 (after optimization)
nuclear@26 516 * or output of scan 1 (if no optimization).
nuclear@26 517 */
nuclear@26 518 master->pass_type = output_pass;
nuclear@26 519 if (! cinfo->optimize_coding)
nuclear@26 520 master->scan_number++;
nuclear@26 521 break;
nuclear@26 522 case huff_opt_pass:
nuclear@26 523 /* next pass is always output of current scan */
nuclear@26 524 master->pass_type = output_pass;
nuclear@26 525 break;
nuclear@26 526 case output_pass:
nuclear@26 527 /* next pass is either optimization or output of next scan */
nuclear@26 528 if (cinfo->optimize_coding)
nuclear@26 529 master->pass_type = huff_opt_pass;
nuclear@26 530 master->scan_number++;
nuclear@26 531 break;
nuclear@26 532 }
nuclear@26 533
nuclear@26 534 master->pass_number++;
nuclear@26 535 }
nuclear@26 536
nuclear@26 537
nuclear@26 538 /*
nuclear@26 539 * Initialize master compression control.
nuclear@26 540 */
nuclear@26 541
nuclear@26 542 GLOBAL(void)
nuclear@26 543 jinit_c_master_control (j_compress_ptr cinfo, boolean transcode_only)
nuclear@26 544 {
nuclear@26 545 my_master_ptr master;
nuclear@26 546
nuclear@26 547 master = (my_master_ptr)
nuclear@26 548 (*cinfo->mem->alloc_small) ((j_common_ptr) cinfo, JPOOL_IMAGE,
nuclear@26 549 SIZEOF(my_comp_master));
nuclear@26 550 cinfo->master = (struct jpeg_comp_master *) master;
nuclear@26 551 master->pub.prepare_for_pass = prepare_for_pass;
nuclear@26 552 master->pub.pass_startup = pass_startup;
nuclear@26 553 master->pub.finish_pass = finish_pass_master;
nuclear@26 554 master->pub.is_last_pass = FALSE;
nuclear@26 555
nuclear@26 556 /* Validate parameters, determine derived values */
nuclear@26 557 initial_setup(cinfo);
nuclear@26 558
nuclear@26 559 if (cinfo->scan_info != NULL) {
nuclear@26 560 #ifdef C_MULTISCAN_FILES_SUPPORTED
nuclear@26 561 validate_script(cinfo);
nuclear@26 562 #else
nuclear@26 563 ERREXIT(cinfo, JERR_NOT_COMPILED);
nuclear@26 564 #endif
nuclear@26 565 } else {
nuclear@26 566 cinfo->progressive_mode = FALSE;
nuclear@26 567 cinfo->num_scans = 1;
nuclear@26 568 }
nuclear@26 569
nuclear@26 570 if (cinfo->progressive_mode) /* TEMPORARY HACK ??? */
nuclear@26 571 cinfo->optimize_coding = TRUE; /* assume default tables no good for progressive mode */
nuclear@26 572
nuclear@26 573 /* Initialize my private state */
nuclear@26 574 if (transcode_only) {
nuclear@26 575 /* no main pass in transcoding */
nuclear@26 576 if (cinfo->optimize_coding)
nuclear@26 577 master->pass_type = huff_opt_pass;
nuclear@26 578 else
nuclear@26 579 master->pass_type = output_pass;
nuclear@26 580 } else {
nuclear@26 581 /* for normal compression, first pass is always this type: */
nuclear@26 582 master->pass_type = main_pass;
nuclear@26 583 }
nuclear@26 584 master->scan_number = 0;
nuclear@26 585 master->pass_number = 0;
nuclear@26 586 if (cinfo->optimize_coding)
nuclear@26 587 master->total_passes = cinfo->num_scans * 2;
nuclear@26 588 else
nuclear@26 589 master->total_passes = cinfo->num_scans;
nuclear@26 590 }