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
22 typedef 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
28 typedef 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
39 typedef my_comp_master * my_master_ptr;
40
41
42 /*
43 * Support routines that do various essential calculations.
44 */
45
46 LOCAL(void)
initial_setup(j_compress_ptr cinfo)47 initial_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
130 LOCAL(void)
validate_script(j_compress_ptr cinfo)131 validate_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
267 LOCAL(void)
select_scan_parameters(j_compress_ptr cinfo)268 select_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
308 LOCAL(void)
per_scan_setup(j_compress_ptr cinfo)309 per_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
401 METHODDEF(void)
prepare_for_pass(j_compress_ptr cinfo)402 prepare_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
489 METHODDEF(void)
pass_startup(j_compress_ptr cinfo)490 pass_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
503 METHODDEF(void)
finish_pass_master(j_compress_ptr cinfo)504 finish_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
543 GLOBAL(void)
jinit_c_master_control(j_compress_ptr cinfo,boolean transcode_only)544 jinit_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