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jpc_t1dec.c (25593B)
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1 /*
2 * Copyright (c) 1999-2000 Image Power, Inc. and the University of
3 * British Columbia.
4 * Copyright (c) 2001-2003 Michael David Adams.
5 * All rights reserved.
6 */
7
8 /* __START_OF_JASPER_LICENSE__
9 *
10 * JasPer License Version 2.0
11 *
12 * Copyright (c) 1999-2000 Image Power, Inc.
13 * Copyright (c) 1999-2000 The University of British Columbia
14 * Copyright (c) 2001-2003 Michael David Adams
15 *
16 * All rights reserved.
17 *
18 * Permission is hereby granted, free of charge, to any person (the
19 * "User") obtaining a copy of this software and associated documentation
20 * files (the "Software"), to deal in the Software without restriction,
21 * including without limitation the rights to use, copy, modify, merge,
22 * publish, distribute, and/or sell copies of the Software, and to permit
23 * persons to whom the Software is furnished to do so, subject to the
24 * following conditions:
25 *
26 * 1. The above copyright notices and this permission notice (which
27 * includes the disclaimer below) shall be included in all copies or
28 * substantial portions of the Software.
29 *
30 * 2. The name of a copyright holder shall not be used to endorse or
31 * promote products derived from the Software without specific prior
32 * written permission.
33 *
34 * THIS DISCLAIMER OF WARRANTY CONSTITUTES AN ESSENTIAL PART OF THIS
35 * LICENSE. NO USE OF THE SOFTWARE IS AUTHORIZED HEREUNDER EXCEPT UNDER
36 * THIS DISCLAIMER. THE SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS
37 * "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING
38 * BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A
39 * PARTICULAR PURPOSE AND NONINFRINGEMENT OF THIRD PARTY RIGHTS. IN NO
40 * EVENT SHALL THE COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, OR ANY SPECIAL
41 * INDIRECT OR CONSEQUENTIAL DAMAGES, OR ANY DAMAGES WHATSOEVER RESULTING
42 * FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT,
43 * NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION
44 * WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. NO ASSURANCES ARE
45 * PROVIDED BY THE COPYRIGHT HOLDERS THAT THE SOFTWARE DOES NOT INFRINGE
46 * THE PATENT OR OTHER INTELLECTUAL PROPERTY RIGHTS OF ANY OTHER ENTITY.
47 * EACH COPYRIGHT HOLDER DISCLAIMS ANY LIABILITY TO THE USER FOR CLAIMS
48 * BROUGHT BY ANY OTHER ENTITY BASED ON INFRINGEMENT OF INTELLECTUAL
49 * PROPERTY RIGHTS OR OTHERWISE. AS A CONDITION TO EXERCISING THE RIGHTS
50 * GRANTED HEREUNDER, EACH USER HEREBY ASSUMES SOLE RESPONSIBILITY TO SECURE
51 * ANY OTHER INTELLECTUAL PROPERTY RIGHTS NEEDED, IF ANY. THE SOFTWARE
52 * IS NOT FAULT-TOLERANT AND IS NOT INTENDED FOR USE IN MISSION-CRITICAL
53 * SYSTEMS, SUCH AS THOSE USED IN THE OPERATION OF NUCLEAR FACILITIES,
54 * AIRCRAFT NAVIGATION OR COMMUNICATION SYSTEMS, AIR TRAFFIC CONTROL
55 * SYSTEMS, DIRECT LIFE SUPPORT MACHINES, OR WEAPONS SYSTEMS, IN WHICH
56 * THE FAILURE OF THE SOFTWARE OR SYSTEM COULD LEAD DIRECTLY TO DEATH,
57 * PERSONAL INJURY, OR SEVERE PHYSICAL OR ENVIRONMENTAL DAMAGE ("HIGH
58 * RISK ACTIVITIES"). THE COPYRIGHT HOLDERS SPECIFICALLY DISCLAIM ANY
59 * EXPRESS OR IMPLIED WARRANTY OF FITNESS FOR HIGH RISK ACTIVITIES.
60 *
61 * __END_OF_JASPER_LICENSE__
62 */
63
64 /*
65 * Tier 1 Decoder
66 *
67 * $Id: jpc_t1dec.c 1918 2005-07-24 14:12:08Z baford $
68 */
69
70 /******************************************************************************\
71 * Includes.
72 \******************************************************************************/
73
74 #include <stdio.h>
75 #include <stdlib.h>
76 #include <assert.h>
77
78 #include "jasper/jas_fix.h"
79 #include "jasper/jas_stream.h"
80 #include "jasper/jas_math.h"
81
82 #include "jpc_bs.h"
83 #include "jpc_mqdec.h"
84 #include "jpc_t1dec.h"
85 #include "jpc_t1cod.h"
86 #include "jpc_dec.h"
87
88 /******************************************************************************\
89 *
90 \******************************************************************************/
91
92 static int jpc_dec_decodecblk(jpc_dec_t *dec, jpc_dec_tile_t *tile, jpc_dec_tcomp_t *tcomp, jpc_dec_band_t *band,
93 jpc_dec_cblk_t *cblk, int dopartial, int maxlyrs);
94 static int dec_sigpass(jpc_dec_t *dec, jpc_mqdec_t *mqdec, int bitpos, int orient,
95 int vcausalflag, jas_matrix_t *flags, jas_matrix_t *data);
96 static int dec_rawsigpass(jpc_dec_t *dec, jpc_bitstream_t *in, int bitpos,
97 int vcausalflag, jas_matrix_t *flags, jas_matrix_t *data);
98 static int dec_refpass(jpc_dec_t *dec, jpc_mqdec_t *mqdec, int bitpos, int vcausalflag,
99 jas_matrix_t *flags, jas_matrix_t *data);
100 static int dec_rawrefpass(jpc_dec_t *dec, jpc_bitstream_t *in, int bitpos,
101 int vcausalflag, jas_matrix_t *flags, jas_matrix_t *data);
102 static int dec_clnpass(jpc_dec_t *dec, jpc_mqdec_t *mqdec, int bitpos, int orient,
103 int vcausalflag, int segsymflag, jas_matrix_t *flags, jas_matrix_t *data);
104
105 #if defined(DEBUG)
106 static long t1dec_cnt = 0;
107 #endif
108
109 #if !defined(DEBUG)
110 #define JPC_T1D_GETBIT(mqdec, v, passtypename, symtypename) \
111 ((v) = jpc_mqdec_getbit(mqdec))
112 #else
113 #define JPC_T1D_GETBIT(mqdec, v, passtypename, symtypename) \
114 { \
115 (v) = jpc_mqdec_getbit(mqdec); \
116 if (jas_getdbglevel() >= 100) { \
117 fprintf(stderr, "index = %ld; passtype = %s; symtype = %s; sym = %d\n", t1dec_cnt, passtypename, symtypename, v); \
118 ++t1dec_cnt; \
119 } \
120 }
121 #endif
122 #define JPC_T1D_GETBITNOSKEW(mqdec, v, passtypename, symtypename) \
123 JPC_T1D_GETBIT(mqdec, v, passtypename, symtypename)
124
125 #if !defined(DEBUG)
126 #define JPC_T1D_RAWGETBIT(bitstream, v, passtypename, symtypename) \
127 ((v) = jpc_bitstream_getbit(bitstream))
128 #else
129 #define JPC_T1D_RAWGETBIT(bitstream, v, passtypename, symtypename) \
130 { \
131 (v) = jpc_bitstream_getbit(bitstream); \
132 if (jas_getdbglevel() >= 100) { \
133 fprintf(stderr, "index = %ld; passtype = %s; symtype = %s; sym = %d\n", t1dec_cnt, passtypename, symtypename, v); \
134 ++t1dec_cnt; \
135 } \
136 }
137 #endif
138
139 /******************************************************************************\
140 * Code.
141 \******************************************************************************/
142
143 int jpc_dec_decodecblks(jpc_dec_t *dec, jpc_dec_tile_t *tile)
144 {
145 jpc_dec_tcomp_t *tcomp;
146 int compcnt;
147 jpc_dec_rlvl_t *rlvl;
148 int rlvlcnt;
149 jpc_dec_band_t *band;
150 int bandcnt;
151 jpc_dec_prc_t *prc;
152 int prccnt;
153 jpc_dec_cblk_t *cblk;
154 int cblkcnt;
155
156 for (compcnt = dec->numcomps, tcomp = tile->tcomps; compcnt > 0;
157 --compcnt, ++tcomp) {
158 for (rlvlcnt = tcomp->numrlvls, rlvl = tcomp->rlvls;
159 rlvlcnt > 0; --rlvlcnt, ++rlvl) {
160 if (!rlvl->bands) {
161 continue;
162 }
163 for (bandcnt = rlvl->numbands, band = rlvl->bands;
164 bandcnt > 0; --bandcnt, ++band) {
165 if (!band->data) {
166 continue;
167 }
168 for (prccnt = rlvl->numprcs, prc = band->prcs;
169 prccnt > 0; --prccnt, ++prc) {
170 if (!prc->cblks) {
171 continue;
172 }
173 for (cblkcnt = prc->numcblks,
174 cblk = prc->cblks; cblkcnt > 0;
175 --cblkcnt, ++cblk) {
176 if (jpc_dec_decodecblk(dec, tile, tcomp,
177 band, cblk, 1, JPC_MAXLYRS)) {
178 return -1;
179 }
180 }
181 }
182
183 }
184 }
185 }
186
187 return 0;
188 }
189
190 static int jpc_dec_decodecblk(jpc_dec_t *dec, jpc_dec_tile_t *tile, jpc_dec_tcomp_t *tcomp, jpc_dec_band_t *band,
191 jpc_dec_cblk_t *cblk, int dopartial, int maxlyrs)
192 {
193 jpc_dec_seg_t *seg;
194 int i;
195 int bpno;
196 int passtype;
197 int ret;
198 int compno;
199 int filldata;
200 int fillmask;
201 jpc_dec_ccp_t *ccp;
202
203 compno = tcomp - tile->tcomps;
204
205 if (!cblk->flags) {
206 /* Note: matrix is assumed to be zeroed */
207 if (!(cblk->flags = jas_matrix_create(jas_matrix_numrows(cblk->data) +
208 2, jas_matrix_numcols(cblk->data) + 2))) {
209 return -1;
210 }
211 }
212
213 seg = cblk->segs.head;
214 while (seg && (seg != cblk->curseg || dopartial) && (maxlyrs < 0 ||
215 seg->lyrno < maxlyrs)) {
216 assert(seg->numpasses >= seg->maxpasses || dopartial);
217 assert(seg->stream);
218 jas_stream_rewind(seg->stream);
219 jas_stream_setrwcount(seg->stream, 0);
220 if (seg->type == JPC_SEG_MQ) {
221 if (!cblk->mqdec) {
222 if (!(cblk->mqdec = jpc_mqdec_create(JPC_NUMCTXS, 0))) {
223 return -1;
224 }
225 jpc_mqdec_setctxs(cblk->mqdec, JPC_NUMCTXS, jpc_mqctxs);
226 }
227 jpc_mqdec_setinput(cblk->mqdec, seg->stream);
228 jpc_mqdec_init(cblk->mqdec);
229 } else {
230 assert(seg->type == JPC_SEG_RAW);
231 if (!cblk->nulldec) {
232 if (!(cblk->nulldec = jpc_bitstream_sopen(seg->stream, "r"))) {
233 assert(0);
234 }
235 }
236 }
237
238
239 for (i = 0; i < seg->numpasses; ++i) {
240 if (cblk->numimsbs > band->numbps) {
241 ccp = &tile->cp->ccps[compno];
242 if (ccp->roishift <= 0) {
243 fprintf(stderr, "warning: corrupt code stream\n");
244 } else {
245 if (cblk->numimsbs < ccp->roishift - band->numbps) {
246 fprintf(stderr, "warning: corrupt code stream\n");
247 }
248 }
249 }
250 bpno = band->roishift + band->numbps - 1 - (cblk->numimsbs +
251 (seg->passno + i - cblk->firstpassno + 2) / 3);
252 if (bpno < 0) {
253 goto premature_exit;
254 }
255 #if 1
256 passtype = (seg->passno + i + 2) % 3;
257 #else
258 passtype = JPC_PASSTYPE(seg->passno + i + 2);
259 #endif
260 assert(bpno >= 0 && bpno < 31);
261 switch (passtype) {
262 case JPC_SIGPASS:
263 ret = (seg->type == JPC_SEG_MQ) ? dec_sigpass(dec,
264 cblk->mqdec, bpno, band->orient,
265 (tile->cp->ccps[compno].cblkctx & JPC_COX_VSC) != 0,
266 cblk->flags, cblk->data) :
267 dec_rawsigpass(dec, cblk->nulldec, bpno,
268 (tile->cp->ccps[compno].cblkctx & JPC_COX_VSC) != 0,
269 cblk->flags, cblk->data);
270 break;
271 case JPC_REFPASS:
272 ret = (seg->type == JPC_SEG_MQ) ?
273 dec_refpass(dec, cblk->mqdec, bpno,
274 (tile->cp->ccps[compno].cblkctx & JPC_COX_VSC) != 0,
275 cblk->flags, cblk->data) :
276 dec_rawrefpass(dec, cblk->nulldec, bpno,
277 (tile->cp->ccps[compno].cblkctx & JPC_COX_VSC) != 0,
278 cblk->flags, cblk->data);
279 break;
280 case JPC_CLNPASS:
281 assert(seg->type == JPC_SEG_MQ);
282 ret = dec_clnpass(dec, cblk->mqdec, bpno,
283 band->orient, (tile->cp->ccps[compno].cblkctx &
284 JPC_COX_VSC) != 0, (tile->cp->ccps[compno].cblkctx &
285 JPC_COX_SEGSYM) != 0, cblk->flags,
286 cblk->data);
287 break;
288 default:
289 ret = -1;
290 break;
291 }
292 /* Do we need to reset after each coding pass? */
293 if (tile->cp->ccps[compno].cblkctx & JPC_COX_RESET) {
294 jpc_mqdec_setctxs(cblk->mqdec, JPC_NUMCTXS, jpc_mqctxs);
295 }
296
297 if (ret) {
298 fprintf(stderr, "coding pass failed passtype=%d segtype=%d\n", passtype, seg->type);
299 return -1;
300 }
301
302 }
303
304 if (seg->type == JPC_SEG_MQ) {
305 /* Note: dont destroy mq decoder because context info will be lost */
306 } else {
307 assert(seg->type == JPC_SEG_RAW);
308 if (tile->cp->ccps[compno].cblkctx & JPC_COX_PTERM) {
309 fillmask = 0x7f;
310 filldata = 0x2a;
311 } else {
312 fillmask = 0;
313 filldata = 0;
314 }
315 if ((ret = jpc_bitstream_inalign(cblk->nulldec, fillmask,
316 filldata)) < 0) {
317 return -1;
318 } else if (ret > 0) {
319 fprintf(stderr, "warning: bad termination pattern detected\n");
320 }
321 jpc_bitstream_close(cblk->nulldec);
322 cblk->nulldec = 0;
323 }
324
325 cblk->curseg = seg->next;
326 jpc_seglist_remove(&cblk->segs, seg);
327 jpc_seg_destroy(seg);
328 seg = cblk->curseg;
329 }
330
331 assert(dopartial ? (!cblk->curseg) : 1);
332
333 premature_exit:
334 return 0;
335 }
336
337 /******************************************************************************\
338 * Code for significance pass.
339 \******************************************************************************/
340
341 #define jpc_sigpass_step(fp, frowstep, dp, bitpos, oneplushalf, orient, mqdec, vcausalflag) \
342 { \
343 int f; \
344 int v; \
345 f = *(fp); \
346 if ((f & JPC_OTHSIGMSK) && !(f & (JPC_SIG | JPC_VISIT))) { \
347 jpc_mqdec_setcurctx((mqdec), JPC_GETZCCTXNO(f, (orient))); \
348 JPC_T1D_GETBIT((mqdec), v, "SIG", "ZC"); \
349 if (v) { \
350 jpc_mqdec_setcurctx((mqdec), JPC_GETSCCTXNO(f)); \
351 JPC_T1D_GETBIT((mqdec), v, "SIG", "SC"); \
352 v ^= JPC_GETSPB(f); \
353 JPC_UPDATEFLAGS4((fp), (frowstep), v, (vcausalflag)); \
354 *(fp) |= JPC_SIG; \
355 *(dp) = (v) ? (-(oneplushalf)) : (oneplushalf); \
356 } \
357 *(fp) |= JPC_VISIT; \
358 } \
359 }
360
361 static int dec_sigpass(jpc_dec_t *dec, register jpc_mqdec_t *mqdec, int bitpos, int orient,
362 int vcausalflag, jas_matrix_t *flags, jas_matrix_t *data)
363 {
364 int i;
365 int j;
366 int one;
367 int half;
368 int oneplushalf;
369 int vscanlen;
370 int width;
371 int height;
372 jpc_fix_t *fp;
373 int frowstep;
374 int fstripestep;
375 jpc_fix_t *fstripestart;
376 jpc_fix_t *fvscanstart;
377 jpc_fix_t *dp;
378 int drowstep;
379 int dstripestep;
380 jpc_fix_t *dstripestart;
381 jpc_fix_t *dvscanstart;
382 int k;
383
384 /* Avoid compiler warning about unused parameters. */
385 dec = 0;
386
387 width = jas_matrix_numcols(data);
388 height = jas_matrix_numrows(data);
389 frowstep = jas_matrix_rowstep(flags);
390 drowstep = jas_matrix_rowstep(data);
391 fstripestep = frowstep << 2;
392 dstripestep = drowstep << 2;
393
394 one = 1 << bitpos;
395 half = one >> 1;
396 oneplushalf = one | half;
397
398 fstripestart = jas_matrix_getref(flags, 1, 1);
399 dstripestart = jas_matrix_getref(data, 0, 0);
400 for (i = height; i > 0; i -= 4, fstripestart += fstripestep,
401 dstripestart += dstripestep) {
402 fvscanstart = fstripestart;
403 dvscanstart = dstripestart;
404 vscanlen = JAS_MIN(i, 4);
405 for (j = width; j > 0; --j, ++fvscanstart, ++dvscanstart) {
406 fp = fvscanstart;
407 dp = dvscanstart;
408 k = vscanlen;
409
410 /* Process first sample in vertical scan. */
411 jpc_sigpass_step(fp, frowstep, dp, bitpos, oneplushalf,
412 orient, mqdec, vcausalflag);
413 if (--k <= 0) {
414 continue;
415 }
416 fp += frowstep;
417 dp += drowstep;
418
419 /* Process second sample in vertical scan. */
420 jpc_sigpass_step(fp, frowstep, dp, bitpos, oneplushalf,
421 orient, mqdec, 0);
422 if (--k <= 0) {
423 continue;
424 }
425 fp += frowstep;
426 dp += drowstep;
427
428 /* Process third sample in vertical scan. */
429 jpc_sigpass_step(fp, frowstep, dp, bitpos, oneplushalf,
430 orient, mqdec, 0);
431 if (--k <= 0) {
432 continue;
433 }
434 fp += frowstep;
435 dp += drowstep;
436
437 /* Process fourth sample in vertical scan. */
438 jpc_sigpass_step(fp, frowstep, dp, bitpos, oneplushalf,
439 orient, mqdec, 0);
440 }
441 }
442 return 0;
443 }
444
445 #define jpc_rawsigpass_step(fp, frowstep, dp, oneplushalf, in, vcausalflag) \
446 { \
447 jpc_fix_t f = *(fp); \
448 jpc_fix_t v; \
449 if ((f & JPC_OTHSIGMSK) && !(f & (JPC_SIG | JPC_VISIT))) { \
450 JPC_T1D_RAWGETBIT(in, v, "SIG", "ZC"); \
451 if (v < 0) { \
452 return -1; \
453 } \
454 if (v) { \
455 JPC_T1D_RAWGETBIT(in, v, "SIG", "SC"); \
456 if (v < 0) { \
457 return -1; \
458 } \
459 JPC_UPDATEFLAGS4((fp), (frowstep), v, (vcausalflag)); \
460 *(fp) |= JPC_SIG; \
461 *(dp) = v ? (-oneplushalf) : (oneplushalf); \
462 } \
463 *(fp) |= JPC_VISIT; \
464 } \
465 }
466
467 static int dec_rawsigpass(jpc_dec_t *dec, jpc_bitstream_t *in, int bitpos, int vcausalflag,
468 jas_matrix_t *flags, jas_matrix_t *data)
469 {
470 int i;
471 int j;
472 int k;
473 int one;
474 int half;
475 int oneplushalf;
476 int vscanlen;
477 int width;
478 int height;
479 jpc_fix_t *fp;
480 int frowstep;
481 int fstripestep;
482 jpc_fix_t *fstripestart;
483 jpc_fix_t *fvscanstart;
484 jpc_fix_t *dp;
485 int drowstep;
486 int dstripestep;
487 jpc_fix_t *dstripestart;
488 jpc_fix_t *dvscanstart;
489
490 /* Avoid compiler warning about unused parameters. */
491 dec = 0;
492
493 width = jas_matrix_numcols(data);
494 height = jas_matrix_numrows(data);
495 frowstep = jas_matrix_rowstep(flags);
496 drowstep = jas_matrix_rowstep(data);
497 fstripestep = frowstep << 2;
498 dstripestep = drowstep << 2;
499
500 one = 1 << bitpos;
501 half = one >> 1;
502 oneplushalf = one | half;
503
504 fstripestart = jas_matrix_getref(flags, 1, 1);
505 dstripestart = jas_matrix_getref(data, 0, 0);
506 for (i = height; i > 0; i -= 4, fstripestart += fstripestep,
507 dstripestart += dstripestep) {
508 fvscanstart = fstripestart;
509 dvscanstart = dstripestart;
510 vscanlen = JAS_MIN(i, 4);
511 for (j = width; j > 0; --j, ++fvscanstart, ++dvscanstart) {
512 fp = fvscanstart;
513 dp = dvscanstart;
514 k = vscanlen;
515
516 /* Process first sample in vertical scan. */
517 jpc_rawsigpass_step(fp, frowstep, dp, oneplushalf,
518 in, vcausalflag);
519 if (--k <= 0) {
520 continue;
521 }
522 fp += frowstep;
523 dp += drowstep;
524
525 /* Process second sample in vertical scan. */
526 jpc_rawsigpass_step(fp, frowstep, dp, oneplushalf,
527 in, 0);
528 if (--k <= 0) {
529 continue;
530 }
531 fp += frowstep;
532 dp += drowstep;
533
534 /* Process third sample in vertical scan. */
535 jpc_rawsigpass_step(fp, frowstep, dp, oneplushalf,
536 in, 0);
537 if (--k <= 0) {
538 continue;
539 }
540 fp += frowstep;
541 dp += drowstep;
542
543 /* Process fourth sample in vertical scan. */
544 jpc_rawsigpass_step(fp, frowstep, dp, oneplushalf,
545 in, 0);
546
547 }
548 }
549 return 0;
550 }
551
552 /******************************************************************************\
553 * Code for refinement pass.
554 \******************************************************************************/
555
556 #define jpc_refpass_step(fp, dp, poshalf, neghalf, mqdec, vcausalflag) \
557 { \
558 int v; \
559 int t; \
560 if (((*(fp)) & (JPC_SIG | JPC_VISIT)) == JPC_SIG) { \
561 jpc_mqdec_setcurctx((mqdec), JPC_GETMAGCTXNO(*(fp))); \
562 JPC_T1D_GETBITNOSKEW((mqdec), v, "REF", "MR"); \
563 t = (v ? (poshalf) : (neghalf)); \
564 *(dp) += (*(dp) < 0) ? (-t) : t; \
565 *(fp) |= JPC_REFINE; \
566 } \
567 }
568
569 static int dec_refpass(jpc_dec_t *dec, register jpc_mqdec_t *mqdec, int bitpos,
570 int vcausalflag, jas_matrix_t *flags, jas_matrix_t *data)
571 {
572 int i;
573 int j;
574 int vscanlen;
575 int width;
576 int height;
577 int one;
578 int poshalf;
579 int neghalf;
580 jpc_fix_t *fp;
581 int frowstep;
582 int fstripestep;
583 jpc_fix_t *fstripestart;
584 jpc_fix_t *fvscanstart;
585 jpc_fix_t *dp;
586 int drowstep;
587 int dstripestep;
588 jpc_fix_t *dstripestart;
589 jpc_fix_t *dvscanstart;
590 int k;
591
592 /* Avoid compiler warning about unused parameters. */
593 dec = 0;
594 vcausalflag = 0;
595
596 width = jas_matrix_numcols(data);
597 height = jas_matrix_numrows(data);
598 frowstep = jas_matrix_rowstep(flags);
599 drowstep = jas_matrix_rowstep(data);
600 fstripestep = frowstep << 2;
601 dstripestep = drowstep << 2;
602
603 one = 1 << bitpos;
604 poshalf = one >> 1;
605 neghalf = (bitpos > 0) ? (-poshalf) : (-1);
606
607 fstripestart = jas_matrix_getref(flags, 1, 1);
608 dstripestart = jas_matrix_getref(data, 0, 0);
609 for (i = height; i > 0; i -= 4, fstripestart += fstripestep,
610 dstripestart += dstripestep) {
611 fvscanstart = fstripestart;
612 dvscanstart = dstripestart;
613 vscanlen = JAS_MIN(i, 4);
614 for (j = width; j > 0; --j, ++fvscanstart, ++dvscanstart) {
615 fp = fvscanstart;
616 dp = dvscanstart;
617 k = vscanlen;
618
619 /* Process first sample in vertical scan. */
620 jpc_refpass_step(fp, dp, poshalf, neghalf, mqdec,
621 vcausalflag);
622 if (--k <= 0) {
623 continue;
624 }
625 fp += frowstep;
626 dp += drowstep;
627
628 /* Process second sample in vertical scan. */
629 jpc_refpass_step(fp, dp, poshalf, neghalf, mqdec, 0);
630 if (--k <= 0) {
631 continue;
632 }
633 fp += frowstep;
634 dp += drowstep;
635
636 /* Process third sample in vertical scan. */
637 jpc_refpass_step(fp, dp, poshalf, neghalf, mqdec, 0);
638 if (--k <= 0) {
639 continue;
640 }
641 fp += frowstep;
642 dp += drowstep;
643
644 /* Process fourth sample in vertical scan. */
645 jpc_refpass_step(fp, dp, poshalf, neghalf, mqdec, 0);
646 }
647 }
648
649 return 0;
650 }
651
652 #define jpc_rawrefpass_step(fp, dp, poshalf, neghalf, in, vcausalflag) \
653 { \
654 jpc_fix_t v; \
655 jpc_fix_t t; \
656 if (((*(fp)) & (JPC_SIG | JPC_VISIT)) == JPC_SIG) { \
657 JPC_T1D_RAWGETBIT(in, v, "REF", "MAGREF"); \
658 if (v < 0) { \
659 return -1; \
660 } \
661 t = (v ? poshalf : neghalf); \
662 *(dp) += (*(dp) < 0) ? (-t) : t; \
663 *(fp) |= JPC_REFINE; \
664 } \
665 }
666
667 static int dec_rawrefpass(jpc_dec_t *dec, jpc_bitstream_t *in, int bitpos, int vcausalflag,
668 jas_matrix_t *flags, jas_matrix_t *data)
669 {
670 int i;
671 int j;
672 int k;
673 int vscanlen;
674 int width;
675 int height;
676 int one;
677 int poshalf;
678 int neghalf;
679 jpc_fix_t *fp;
680 int frowstep;
681 int fstripestep;
682 jpc_fix_t *fstripestart;
683 jpc_fix_t *fvscanstart;
684 jpc_fix_t *dp;
685 int drowstep;
686 int dstripestep;
687 jpc_fix_t *dstripestart;
688 jpc_fix_t *dvscanstart;
689
690 /* Avoid compiler warning about unused parameters. */
691 dec = 0;
692 vcausalflag = 0;
693
694 width = jas_matrix_numcols(data);
695 height = jas_matrix_numrows(data);
696 frowstep = jas_matrix_rowstep(flags);
697 drowstep = jas_matrix_rowstep(data);
698 fstripestep = frowstep << 2;
699 dstripestep = drowstep << 2;
700
701 one = 1 << bitpos;
702 poshalf = one >> 1;
703 neghalf = (bitpos > 0) ? (-poshalf) : (-1);
704
705 fstripestart = jas_matrix_getref(flags, 1, 1);
706 dstripestart = jas_matrix_getref(data, 0, 0);
707 for (i = height; i > 0; i -= 4, fstripestart += fstripestep,
708 dstripestart += dstripestep) {
709 fvscanstart = fstripestart;
710 dvscanstart = dstripestart;
711 vscanlen = JAS_MIN(i, 4);
712 for (j = width; j > 0; --j, ++fvscanstart, ++dvscanstart) {
713 fp = fvscanstart;
714 dp = dvscanstart;
715 k = vscanlen;
716
717 /* Process first sample in vertical scan. */
718 jpc_rawrefpass_step(fp, dp, poshalf, neghalf, in,
719 vcausalflag);
720 if (--k <= 0) {
721 continue;
722 }
723 fp += frowstep;
724 dp += drowstep;
725
726 /* Process second sample in vertical scan. */
727 jpc_rawrefpass_step(fp, dp, poshalf, neghalf, in, 0);
728 if (--k <= 0) {
729 continue;
730 }
731 fp += frowstep;
732 dp += drowstep;
733
734 /* Process third sample in vertical scan. */
735 jpc_rawrefpass_step(fp, dp, poshalf, neghalf, in, 0);
736 if (--k <= 0) {
737 continue;
738 }
739 fp += frowstep;
740 dp += drowstep;
741
742 /* Process fourth sample in vertical scan. */
743 jpc_rawrefpass_step(fp, dp, poshalf, neghalf, in, 0);
744 }
745 }
746 return 0;
747 }
748
749 /******************************************************************************\
750 * Code for cleanup pass.
751 \******************************************************************************/
752
753 #define jpc_clnpass_step(f, fp, frowstep, dp, oneplushalf, orient, mqdec, flabel, plabel, vcausalflag) \
754 { \
755 int v; \
756 flabel \
757 if (!((f) & (JPC_SIG | JPC_VISIT))) { \
758 jpc_mqdec_setcurctx((mqdec), JPC_GETZCCTXNO((f), (orient))); \
759 JPC_T1D_GETBIT((mqdec), v, "CLN", "ZC"); \
760 if (v) { \
761 plabel \
762 /* Coefficient is significant. */ \
763 jpc_mqdec_setcurctx((mqdec), JPC_GETSCCTXNO(f)); \
764 JPC_T1D_GETBIT((mqdec), v, "CLN", "SC"); \
765 v ^= JPC_GETSPB(f); \
766 *(dp) = (v) ? (-(oneplushalf)) : (oneplushalf); \
767 JPC_UPDATEFLAGS4((fp), (frowstep), v, (vcausalflag)); \
768 *(fp) |= JPC_SIG; \
769 } \
770 } \
771 /* XXX - Is this correct? Can aggregation cause some VISIT bits not to be reset? Check. */ \
772 *(fp) &= ~JPC_VISIT; \
773 }
774
775 static int dec_clnpass(jpc_dec_t *dec, register jpc_mqdec_t *mqdec, int bitpos, int orient,
776 int vcausalflag, int segsymflag, jas_matrix_t *flags, jas_matrix_t *data)
777 {
778 int i;
779 int j;
780 int k;
781 int vscanlen;
782 int v;
783 int half;
784 int runlen;
785 int f;
786 int width;
787 int height;
788 int one;
789 int oneplushalf;
790
791 jpc_fix_t *fp;
792 int frowstep;
793 int fstripestep;
794 jpc_fix_t *fstripestart;
795 jpc_fix_t *fvscanstart;
796
797 jpc_fix_t *dp;
798 int drowstep;
799 int dstripestep;
800 jpc_fix_t *dstripestart;
801 jpc_fix_t *dvscanstart;
802
803 /* Avoid compiler warning about unused parameters. */
804 dec = 0;
805
806 one = 1 << bitpos;
807 half = one >> 1;
808 oneplushalf = one | half;
809
810 width = jas_matrix_numcols(data);
811 height = jas_matrix_numrows(data);
812
813 frowstep = jas_matrix_rowstep(flags);
814 drowstep = jas_matrix_rowstep(data);
815 fstripestep = frowstep << 2;
816 dstripestep = drowstep << 2;
817
818 fstripestart = jas_matrix_getref(flags, 1, 1);
819 dstripestart = jas_matrix_getref(data, 0, 0);
820 for (i = 0; i < height; i += 4, fstripestart += fstripestep,
821 dstripestart += dstripestep) {
822 fvscanstart = fstripestart;
823 dvscanstart = dstripestart;
824 vscanlen = JAS_MIN(4, height - i);
825 for (j = width; j > 0; --j, ++fvscanstart, ++dvscanstart) {
826 fp = fvscanstart;
827 if (vscanlen >= 4 && (!((*fp) & (JPC_SIG | JPC_VISIT |
828 JPC_OTHSIGMSK))) && (fp += frowstep, !((*fp) & (JPC_SIG |
829 JPC_VISIT | JPC_OTHSIGMSK))) && (fp += frowstep, !((*fp) &
830 (JPC_SIG | JPC_VISIT | JPC_OTHSIGMSK))) && (fp += frowstep,
831 !((*fp) & (JPC_SIG | JPC_VISIT | JPC_OTHSIGMSK)))) {
832
833 jpc_mqdec_setcurctx(mqdec, JPC_AGGCTXNO);
834 JPC_T1D_GETBIT(mqdec, v, "CLN", "AGG");
835 if (!v) {
836 continue;
837 }
838 jpc_mqdec_setcurctx(mqdec, JPC_UCTXNO);
839 JPC_T1D_GETBITNOSKEW(mqdec, v, "CLN", "RL");
840 runlen = v;
841 JPC_T1D_GETBITNOSKEW(mqdec, v, "CLN", "RL");
842 runlen = (runlen << 1) | v;
843 f = *(fp = fvscanstart + frowstep * runlen);
844 dp = dvscanstart + drowstep * runlen;
845 k = vscanlen - runlen;
846 switch (runlen) {
847 case 0:
848 goto clnpass_partial0;
849 break;
850 case 1:
851 goto clnpass_partial1;
852 break;
853 case 2:
854 goto clnpass_partial2;
855 break;
856 case 3:
857 goto clnpass_partial3;
858 break;
859 }
860 } else {
861 f = *(fp = fvscanstart);
862 dp = dvscanstart;
863 k = vscanlen;
864 goto clnpass_full0;
865 }
866
867 /* Process first sample in vertical scan. */
868 jpc_clnpass_step(f, fp, frowstep, dp, oneplushalf, orient,
869 mqdec, clnpass_full0:, clnpass_partial0:,
870 vcausalflag);
871 if (--k <= 0) {
872 continue;
873 }
874 fp += frowstep;
875 dp += drowstep;
876
877 /* Process second sample in vertical scan. */
878 f = *fp;
879 jpc_clnpass_step(f, fp, frowstep, dp, oneplushalf, orient,
880 mqdec, ;, clnpass_partial1:, 0);
881 if (--k <= 0) {
882 continue;
883 }
884 fp += frowstep;
885 dp += drowstep;
886
887 /* Process third sample in vertical scan. */
888 f = *fp;
889 jpc_clnpass_step(f, fp, frowstep, dp, oneplushalf, orient,
890 mqdec, ;, clnpass_partial2:, 0);
891 if (--k <= 0) {
892 continue;
893 }
894 fp += frowstep;
895 dp += drowstep;
896
897 /* Process fourth sample in vertical scan. */
898 f = *fp;
899 jpc_clnpass_step(f, fp, frowstep, dp, oneplushalf, orient,
900 mqdec, ;, clnpass_partial3:, 0);
901 }
902 }
903
904 if (segsymflag) {
905 int segsymval;
906 segsymval = 0;
907 jpc_mqdec_setcurctx(mqdec, JPC_UCTXNO);
908 JPC_T1D_GETBITNOSKEW(mqdec, v, "CLN", "SEGSYM");
909 segsymval = (segsymval << 1) | (v & 1);
910 JPC_T1D_GETBITNOSKEW(mqdec, v, "CLN", "SEGSYM");
911 segsymval = (segsymval << 1) | (v & 1);
912 JPC_T1D_GETBITNOSKEW(mqdec, v, "CLN", "SEGSYM");
913 segsymval = (segsymval << 1) | (v & 1);
914 JPC_T1D_GETBITNOSKEW(mqdec, v, "CLN", "SEGSYM");
915 segsymval = (segsymval << 1) | (v & 1);
916 if (segsymval != 0xa) {
917 fprintf(stderr, "warning: bad segmentation symbol\n");
918 }
919 }
920
921 return 0;
922 }