jdphuff.c
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1 /*
2  * jdphuff.c
3  *
4  * Copyright (C) 1995-1997, 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 Huffman entropy decoding routines for progressive JPEG.
9  *
10  * Much of the complexity here has to do with supporting input suspension.
11  * If the data source module demands suspension, we want to be able to back
12  * up to the start of the current MCU. To do this, we copy state variables
13  * into local working storage, and update them back to the permanent
14  * storage only upon successful completion of an MCU.
15  */
16 
17 #define JPEG_INTERNALS
18 #include "jinclude.h"
19 #include "jpeglib.h"
20 #include "jdhuff.h" /* Declarations shared with jdhuff.c */
21 
22 
23 #ifdef D_PROGRESSIVE_SUPPORTED
24 
25 /*
26  * Expanded entropy decoder object for progressive Huffman decoding.
27  *
28  * The savable_state subrecord contains fields that change within an MCU,
29  * but must not be updated permanently until we complete the MCU.
30  */
31 
32 typedef struct {
33  unsigned int EOBRUN; /* remaining EOBs in EOBRUN */
34  int last_dc_val[MAX_COMPS_IN_SCAN]; /* last DC coef for each component */
36 
37 /* This macro is to work around compilers with missing or broken
38  * structure assignment. You'll need to fix this code if you have
39  * such a compiler and you change MAX_COMPS_IN_SCAN.
40  */
41 
42 #ifndef NO_STRUCT_ASSIGN
43 #define ASSIGN_STATE(dest,src) ((dest) = (src))
44 #else
45 #if MAX_COMPS_IN_SCAN == 4
46 #define ASSIGN_STATE(dest,src) \
47  ((dest).EOBRUN = (src).EOBRUN, \
48  (dest).last_dc_val[0] = (src).last_dc_val[0], \
49  (dest).last_dc_val[1] = (src).last_dc_val[1], \
50  (dest).last_dc_val[2] = (src).last_dc_val[2], \
51  (dest).last_dc_val[3] = (src).last_dc_val[3])
52 #endif
53 #endif
54 
55 
56 typedef struct {
57  struct jpeg_entropy_decoder pub; /* public fields */
58 
59  /* These fields are loaded into local variables at start of each MCU.
60  * In case of suspension, we exit WITHOUT updating them.
61  */
62  bitread_perm_state bitstate; /* Bit buffer at start of MCU */
63  savable_state saved; /* Other state at start of MCU */
64 
65  /* These fields are NOT loaded into local working state. */
66  unsigned int restarts_to_go; /* MCUs left in this restart interval */
67 
68  /* Pointers to derived tables (these workspaces have image lifespan) */
69  d_derived_tbl * derived_tbls[NUM_HUFF_TBLS];
70 
71  d_derived_tbl * ac_derived_tbl; /* active table during an AC scan */
73 
75 
76 /* Forward declarations */
78  JBLOCKROW *MCU_data));
80  JBLOCKROW *MCU_data));
82  JBLOCKROW *MCU_data));
84  JBLOCKROW *MCU_data));
85 
86 
87 /*
88  * Initialize for a Huffman-compressed scan.
89  */
90 
91 METHODDEF(void)
92 start_pass_phuff_decoder (j_decompress_ptr cinfo)
93 {
94  phuff_entropy_ptr entropy = (phuff_entropy_ptr) cinfo->entropy;
95  boolean is_DC_band, bad;
96  int ci, coefi, tbl;
97  int *coef_bit_ptr;
99 
100  is_DC_band = (cinfo->Ss == 0);
101 
102  /* Validate scan parameters */
103  bad = FALSE;
104  if (is_DC_band) {
105  if (cinfo->Se != 0)
106  bad = TRUE;
107  } else {
108  /* need not check Ss/Se < 0 since they came from unsigned bytes */
109  if (cinfo->Ss > cinfo->Se || cinfo->Se >= DCTSIZE2)
110  bad = TRUE;
111  /* AC scans may have only one component */
112  if (cinfo->comps_in_scan != 1)
113  bad = TRUE;
114  }
115  if (cinfo->Ah != 0) {
116  /* Successive approximation refinement scan: must have Al = Ah-1. */
117  if (cinfo->Al != cinfo->Ah-1)
118  bad = TRUE;
119  }
120  if (cinfo->Al > 13) /* need not check for < 0 */
121  bad = TRUE;
122  /* Arguably the maximum Al value should be less than 13 for 8-bit precision,
123  * but the spec doesn't say so, and we try to be liberal about what we
124  * accept. Note: large Al values could result in out-of-range DC
125  * coefficients during early scans, leading to bizarre displays due to
126  * overflows in the IDCT math. But we won't crash.
127  */
128  if (bad)
129  ERREXIT4(cinfo, JERR_BAD_PROGRESSION,
130  cinfo->Ss, cinfo->Se, cinfo->Ah, cinfo->Al);
131  /* Update progression status, and verify that scan order is legal.
132  * Note that inter-scan inconsistencies are treated as warnings
133  * not fatal errors ... not clear if this is right way to behave.
134  */
135  for (ci = 0; ci < cinfo->comps_in_scan; ci++) {
136  int cindex = cinfo->cur_comp_info[ci]->component_index;
137  coef_bit_ptr = & cinfo->coef_bits[cindex][0];
138  if (!is_DC_band && coef_bit_ptr[0] < 0) /* AC without prior DC scan */
139  WARNMS2(cinfo, JWRN_BOGUS_PROGRESSION, cindex, 0);
140  for (coefi = cinfo->Ss; coefi <= cinfo->Se; coefi++) {
141  int expected = (coef_bit_ptr[coefi] < 0) ? 0 : coef_bit_ptr[coefi];
142  if (cinfo->Ah != expected)
143  WARNMS2(cinfo, JWRN_BOGUS_PROGRESSION, cindex, coefi);
144  coef_bit_ptr[coefi] = cinfo->Al;
145  }
146  }
147 
148  /* Select MCU decoding routine */
149  if (cinfo->Ah == 0) {
150  if (is_DC_band)
151  entropy->pub.decode_mcu = decode_mcu_DC_first;
152  else
153  entropy->pub.decode_mcu = decode_mcu_AC_first;
154  } else {
155  if (is_DC_band)
156  entropy->pub.decode_mcu = decode_mcu_DC_refine;
157  else
158  entropy->pub.decode_mcu = decode_mcu_AC_refine;
159  }
160 
161  for (ci = 0; ci < cinfo->comps_in_scan; ci++) {
162  compptr = cinfo->cur_comp_info[ci];
163  /* Make sure requested tables are present, and compute derived tables.
164  * We may build same derived table more than once, but it's not expensive.
165  */
166  if (is_DC_band) {
167  if (cinfo->Ah == 0) { /* DC refinement needs no table */
168  tbl = compptr->dc_tbl_no;
169  jpeg_make_d_derived_tbl(cinfo, TRUE, tbl,
170  & entropy->derived_tbls[tbl]);
171  }
172  } else {
173  tbl = compptr->ac_tbl_no;
174  jpeg_make_d_derived_tbl(cinfo, FALSE, tbl,
175  & entropy->derived_tbls[tbl]);
176  /* remember the single active table */
177  entropy->ac_derived_tbl = entropy->derived_tbls[tbl];
178  }
179  /* Initialize DC predictions to 0 */
180  entropy->saved.last_dc_val[ci] = 0;
181  }
182 
183  /* Initialize bitread state variables */
184  entropy->bitstate.bits_left = 0;
185  entropy->bitstate.get_buffer = 0; /* unnecessary, but keeps Purify quiet */
186  entropy->pub.insufficient_data = FALSE;
187 
188  /* Initialize private state variables */
189  entropy->saved.EOBRUN = 0;
190 
191  /* Initialize restart counter */
192  entropy->restarts_to_go = cinfo->restart_interval;
193 }
194 
195 
196 /*
197  * Figure F.12: extend sign bit.
198  * On some machines, a shift and add will be faster than a table lookup.
199  */
200 
201 #ifdef AVOID_TABLES
202 
203 #define HUFF_EXTEND(x,s) ((x) < (1<<((s)-1)) ? (x) + (((-1)<<(s)) + 1) : (x))
204 
205 #else
206 
207 #define HUFF_EXTEND(x,s) ((x) < extend_test[s] ? (x) + extend_offset[s] : (x))
208 
209 static const int extend_test[16] = /* entry n is 2**(n-1) */
210  { 0, 0x0001, 0x0002, 0x0004, 0x0008, 0x0010, 0x0020, 0x0040, 0x0080,
211  0x0100, 0x0200, 0x0400, 0x0800, 0x1000, 0x2000, 0x4000 };
212 
213 static const int extend_offset[16] = /* entry n is (-1 << n) + 1 */
214  { 0, ((-1)<<1) + 1, ((-1)<<2) + 1, ((-1)<<3) + 1, ((-1)<<4) + 1,
215  ((-1)<<5) + 1, ((-1)<<6) + 1, ((-1)<<7) + 1, ((-1)<<8) + 1,
216  ((-1)<<9) + 1, ((-1)<<10) + 1, ((-1)<<11) + 1, ((-1)<<12) + 1,
217  ((-1)<<13) + 1, ((-1)<<14) + 1, ((-1)<<15) + 1 };
218 
219 #endif /* AVOID_TABLES */
220 
221 
222 /*
223  * Check for a restart marker & resynchronize decoder.
224  * Returns FALSE if must suspend.
225  */
226 
227 LOCAL(boolean)
229 {
230  phuff_entropy_ptr entropy = (phuff_entropy_ptr) cinfo->entropy;
231  int ci;
232 
233  /* Throw away any unused bits remaining in bit buffer; */
234  /* include any full bytes in next_marker's count of discarded bytes */
235  cinfo->marker->discarded_bytes += entropy->bitstate.bits_left / 8;
236  entropy->bitstate.bits_left = 0;
237 
238  /* Advance past the RSTn marker */
239  if (! (*cinfo->marker->read_restart_marker) (cinfo))
240  return FALSE;
241 
242  /* Re-initialize DC predictions to 0 */
243  for (ci = 0; ci < cinfo->comps_in_scan; ci++)
244  entropy->saved.last_dc_val[ci] = 0;
245  /* Re-init EOB run count, too */
246  entropy->saved.EOBRUN = 0;
247 
248  /* Reset restart counter */
249  entropy->restarts_to_go = cinfo->restart_interval;
250 
251  /* Reset out-of-data flag, unless read_restart_marker left us smack up
252  * against a marker. In that case we will end up treating the next data
253  * segment as empty, and we can avoid producing bogus output pixels by
254  * leaving the flag set.
255  */
256  if (cinfo->unread_marker == 0)
257  entropy->pub.insufficient_data = FALSE;
258 
259  return TRUE;
260 }
261 
262 
263 /*
264  * Huffman MCU decoding.
265  * Each of these routines decodes and returns one MCU's worth of
266  * Huffman-compressed coefficients.
267  * The coefficients are reordered from zigzag order into natural array order,
268  * but are not dequantized.
269  *
270  * The i'th block of the MCU is stored into the block pointed to by
271  * MCU_data[i]. WE ASSUME THIS AREA IS INITIALLY ZEROED BY THE CALLER.
272  *
273  * We return FALSE if data source requested suspension. In that case no
274  * changes have been made to permanent state. (Exception: some output
275  * coefficients may already have been assigned. This is harmless for
276  * spectral selection, since we'll just re-assign them on the next call.
277  * Successive approximation AC refinement has to be more careful, however.)
278  */
279 
280 /*
281  * MCU decoding for DC initial scan (either spectral selection,
282  * or first pass of successive approximation).
283  */
284 
285 METHODDEF(boolean)
287 {
288  phuff_entropy_ptr entropy = (phuff_entropy_ptr) cinfo->entropy;
289  int Al = cinfo->Al;
290  register int s, r;
291  int blkn, ci;
292  JBLOCKROW block;
294  savable_state state;
295  d_derived_tbl * tbl;
297 
298  /* Process restart marker if needed; may have to suspend */
299  if (cinfo->restart_interval) {
300  if (entropy->restarts_to_go == 0)
301  if (! process_restart(cinfo))
302  return FALSE;
303  }
304 
305  /* If we've run out of data, just leave the MCU set to zeroes.
306  * This way, we return uniform gray for the remainder of the segment.
307  */
308  if (! entropy->pub.insufficient_data) {
309 
310  /* Load up working state */
311  BITREAD_LOAD_STATE(cinfo,entropy->bitstate);
312  ASSIGN_STATE(state, entropy->saved);
313 
314  /* Outer loop handles each block in the MCU */
315 
316  for (blkn = 0; blkn < cinfo->blocks_in_MCU; blkn++) {
317  block = MCU_data[blkn];
318  ci = cinfo->MCU_membership[blkn];
319  compptr = cinfo->cur_comp_info[ci];
320  tbl = entropy->derived_tbls[compptr->dc_tbl_no];
321 
322  /* Decode a single block's worth of coefficients */
323 
324  /* Section F.2.2.1: decode the DC coefficient difference */
325  HUFF_DECODE(s, br_state, tbl, return FALSE, label1);
326  if (s) {
327  CHECK_BIT_BUFFER(br_state, s, return FALSE);
328  r = GET_BITS(s);
329  s = HUFF_EXTEND(r, s);
330  }
331 
332  /* Convert DC difference to actual value, update last_dc_val */
333  s += state.last_dc_val[ci];
334  state.last_dc_val[ci] = s;
335  /* Scale and output the coefficient (assumes jpeg_natural_order[0]=0) */
336  (*block)[0] = (JCOEF) (s << Al);
337  }
338 
339  /* Completed MCU, so update state */
340  BITREAD_SAVE_STATE(cinfo,entropy->bitstate);
341  ASSIGN_STATE(entropy->saved, state);
342  }
343 
344  /* Account for restart interval (no-op if not using restarts) */
345  entropy->restarts_to_go--;
346 
347  return TRUE;
348 }
349 
350 
351 /*
352  * MCU decoding for AC initial scan (either spectral selection,
353  * or first pass of successive approximation).
354  */
355 
356 METHODDEF(boolean)
358 {
359  phuff_entropy_ptr entropy = (phuff_entropy_ptr) cinfo->entropy;
360  int Se = cinfo->Se;
361  int Al = cinfo->Al;
362  register int s, k, r;
363  unsigned int EOBRUN;
364  JBLOCKROW block;
366  d_derived_tbl * tbl;
367 
368  /* Process restart marker if needed; may have to suspend */
369  if (cinfo->restart_interval) {
370  if (entropy->restarts_to_go == 0)
371  if (! process_restart(cinfo))
372  return FALSE;
373  }
374 
375  /* If we've run out of data, just leave the MCU set to zeroes.
376  * This way, we return uniform gray for the remainder of the segment.
377  */
378  if (! entropy->pub.insufficient_data) {
379 
380  /* Load up working state.
381  * We can avoid loading/saving bitread state if in an EOB run.
382  */
383  EOBRUN = entropy->saved.EOBRUN; /* only part of saved state we need */
384 
385  /* There is always only one block per MCU */
386 
387  if (EOBRUN > 0) /* if it's a band of zeroes... */
388  EOBRUN--; /* ...process it now (we do nothing) */
389  else {
390  BITREAD_LOAD_STATE(cinfo,entropy->bitstate);
391  block = MCU_data[0];
392  tbl = entropy->ac_derived_tbl;
393 
394  for (k = cinfo->Ss; k <= Se; k++) {
395  HUFF_DECODE(s, br_state, tbl, return FALSE, label2);
396  r = s >> 4;
397  s &= 15;
398  if (s) {
399  k += r;
400  CHECK_BIT_BUFFER(br_state, s, return FALSE);
401  r = GET_BITS(s);
402  s = HUFF_EXTEND(r, s);
403  /* Scale and output coefficient in natural (dezigzagged) order */
404  (*block)[jpeg_natural_order[k]] = (JCOEF) (s << Al);
405  } else {
406  if (r == 15) { /* ZRL */
407  k += 15; /* skip 15 zeroes in band */
408  } else { /* EOBr, run length is 2^r + appended bits */
409  EOBRUN = 1 << r;
410  if (r) { /* EOBr, r > 0 */
411  CHECK_BIT_BUFFER(br_state, r, return FALSE);
412  r = GET_BITS(r);
413  EOBRUN += r;
414  }
415  EOBRUN--; /* this band is processed at this moment */
416  break; /* force end-of-band */
417  }
418  }
419  }
420 
421  BITREAD_SAVE_STATE(cinfo,entropy->bitstate);
422  }
423 
424  /* Completed MCU, so update state */
425  entropy->saved.EOBRUN = EOBRUN; /* only part of saved state we need */
426  }
427 
428  /* Account for restart interval (no-op if not using restarts) */
429  entropy->restarts_to_go--;
430 
431  return TRUE;
432 }
433 
434 
435 /*
436  * MCU decoding for DC successive approximation refinement scan.
437  * Note: we assume such scans can be multi-component, although the spec
438  * is not very clear on the point.
439  */
440 
441 METHODDEF(boolean)
443 {
444  phuff_entropy_ptr entropy = (phuff_entropy_ptr) cinfo->entropy;
445  int p1 = 1 << cinfo->Al; /* 1 in the bit position being coded */
446  int blkn;
447  JBLOCKROW block;
449 
450  /* Process restart marker if needed; may have to suspend */
451  if (cinfo->restart_interval) {
452  if (entropy->restarts_to_go == 0)
453  if (! process_restart(cinfo))
454  return FALSE;
455  }
456 
457  /* Not worth the cycles to check insufficient_data here,
458  * since we will not change the data anyway if we read zeroes.
459  */
460 
461  /* Load up working state */
462  BITREAD_LOAD_STATE(cinfo,entropy->bitstate);
463 
464  /* Outer loop handles each block in the MCU */
465 
466  for (blkn = 0; blkn < cinfo->blocks_in_MCU; blkn++) {
467  block = MCU_data[blkn];
468 
469  /* Encoded data is simply the next bit of the two's-complement DC value */
470  CHECK_BIT_BUFFER(br_state, 1, return FALSE);
471  if (GET_BITS(1))
472  (*block)[0] |= p1;
473  /* Note: since we use |=, repeating the assignment later is safe */
474  }
475 
476  /* Completed MCU, so update state */
477  BITREAD_SAVE_STATE(cinfo,entropy->bitstate);
478 
479  /* Account for restart interval (no-op if not using restarts) */
480  entropy->restarts_to_go--;
481 
482  return TRUE;
483 }
484 
485 
486 /*
487  * MCU decoding for AC successive approximation refinement scan.
488  */
489 
490 METHODDEF(boolean)
492 {
493  phuff_entropy_ptr entropy = (phuff_entropy_ptr) cinfo->entropy;
494  int Se = cinfo->Se;
495  int p1 = 1 << cinfo->Al; /* 1 in the bit position being coded */
496  int m1 = (-1) << cinfo->Al; /* -1 in the bit position being coded */
497  register int s, k, r;
498  unsigned int EOBRUN;
499  JBLOCKROW block;
500  JCOEFPTR thiscoef;
502  d_derived_tbl * tbl;
503  int num_newnz;
504  int newnz_pos[DCTSIZE2];
505 
506  /* Process restart marker if needed; may have to suspend */
507  if (cinfo->restart_interval) {
508  if (entropy->restarts_to_go == 0)
509  if (! process_restart(cinfo))
510  return FALSE;
511  }
512 
513  /* If we've run out of data, don't modify the MCU.
514  */
515  if (! entropy->pub.insufficient_data) {
516 
517  /* Load up working state */
518  BITREAD_LOAD_STATE(cinfo,entropy->bitstate);
519  EOBRUN = entropy->saved.EOBRUN; /* only part of saved state we need */
520 
521  /* There is always only one block per MCU */
522  block = MCU_data[0];
523  tbl = entropy->ac_derived_tbl;
524 
525  /* If we are forced to suspend, we must undo the assignments to any newly
526  * nonzero coefficients in the block, because otherwise we'd get confused
527  * next time about which coefficients were already nonzero.
528  * But we need not undo addition of bits to already-nonzero coefficients;
529  * instead, we can test the current bit to see if we already did it.
530  */
531  num_newnz = 0;
532 
533  /* initialize coefficient loop counter to start of band */
534  k = cinfo->Ss;
535 
536  if (EOBRUN == 0) {
537  for (; k <= Se; k++) {
538  HUFF_DECODE(s, br_state, tbl, goto undoit, label3);
539  r = s >> 4;
540  s &= 15;
541  if (s) {
542  if (s != 1) /* size of new coef should always be 1 */
543  WARNMS(cinfo, JWRN_HUFF_BAD_CODE);
544  CHECK_BIT_BUFFER(br_state, 1, goto undoit);
545  if (GET_BITS(1))
546  s = p1; /* newly nonzero coef is positive */
547  else
548  s = m1; /* newly nonzero coef is negative */
549  } else {
550  if (r != 15) {
551  EOBRUN = 1 << r; /* EOBr, run length is 2^r + appended bits */
552  if (r) {
553  CHECK_BIT_BUFFER(br_state, r, goto undoit);
554  r = GET_BITS(r);
555  EOBRUN += r;
556  }
557  break; /* rest of block is handled by EOB logic */
558  }
559  /* note s = 0 for processing ZRL */
560  }
561  /* Advance over already-nonzero coefs and r still-zero coefs,
562  * appending correction bits to the nonzeroes. A correction bit is 1
563  * if the absolute value of the coefficient must be increased.
564  */
565  do {
566  thiscoef = *block + jpeg_natural_order[k];
567  if (*thiscoef != 0) {
568  CHECK_BIT_BUFFER(br_state, 1, goto undoit);
569  if (GET_BITS(1)) {
570  if ((*thiscoef & p1) == 0) { /* do nothing if already set it */
571  if (*thiscoef >= 0)
572  *thiscoef += p1;
573  else
574  *thiscoef += m1;
575  }
576  }
577  } else {
578  if (--r < 0)
579  break; /* reached target zero coefficient */
580  }
581  k++;
582  } while (k <= Se);
583  if (s) {
584  int pos = jpeg_natural_order[k];
585  /* Output newly nonzero coefficient */
586  (*block)[pos] = (JCOEF) s;
587  /* Remember its position in case we have to suspend */
588  newnz_pos[num_newnz++] = pos;
589  }
590  }
591  }
592 
593  if (EOBRUN > 0) {
594  /* Scan any remaining coefficient positions after the end-of-band
595  * (the last newly nonzero coefficient, if any). Append a correction
596  * bit to each already-nonzero coefficient. A correction bit is 1
597  * if the absolute value of the coefficient must be increased.
598  */
599  for (; k <= Se; k++) {
600  thiscoef = *block + jpeg_natural_order[k];
601  if (*thiscoef != 0) {
602  CHECK_BIT_BUFFER(br_state, 1, goto undoit);
603  if (GET_BITS(1)) {
604  if ((*thiscoef & p1) == 0) { /* do nothing if already changed it */
605  if (*thiscoef >= 0)
606  *thiscoef += p1;
607  else
608  *thiscoef += m1;
609  }
610  }
611  }
612  }
613  /* Count one block completed in EOB run */
614  EOBRUN--;
615  }
616 
617  /* Completed MCU, so update state */
618  BITREAD_SAVE_STATE(cinfo,entropy->bitstate);
619  entropy->saved.EOBRUN = EOBRUN; /* only part of saved state we need */
620  }
621 
622  /* Account for restart interval (no-op if not using restarts) */
623  entropy->restarts_to_go--;
624 
625  return TRUE;
626 
627 undoit:
628  /* Re-zero any output coefficients that we made newly nonzero */
629  while (num_newnz > 0)
630  (*block)[newnz_pos[--num_newnz]] = 0;
631 
632  return FALSE;
633 }
634 
635 
636 /*
637  * Module initialization routine for progressive Huffman entropy decoding.
638  */
639 
640 GLOBAL(void)
642 {
643  phuff_entropy_ptr entropy;
644  int *coef_bit_ptr;
645  int ci, i;
646 
647  entropy = (phuff_entropy_ptr)
648  (*cinfo->mem->alloc_small) ((j_common_ptr) cinfo, JPOOL_IMAGE,
650  cinfo->entropy = (struct jpeg_entropy_decoder *) entropy;
651  entropy->pub.start_pass = start_pass_phuff_decoder;
652 
653  /* Mark derived tables unallocated */
654  for (i = 0; i < NUM_HUFF_TBLS; i++) {
655  entropy->derived_tbls[i] = NULL;
656  }
657 
658  /* Create progression status table */
659  cinfo->coef_bits = (int (*)[DCTSIZE2])
660  (*cinfo->mem->alloc_small) ((j_common_ptr) cinfo, JPOOL_IMAGE,
661  cinfo->num_components*DCTSIZE2*SIZEOF(int));
662  coef_bit_ptr = & cinfo->coef_bits[0][0];
663  for (ci = 0; ci < cinfo->num_components; ci++)
664  for (i = 0; i < DCTSIZE2; i++)
665  *coef_bit_ptr++ = -1;
666 }
667 
668 #endif /* D_PROGRESSIVE_SUPPORTED */
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openhrp3
Author(s): AIST, General Robotix Inc., Nakamura Lab of Dept. of Mechano Informatics at University of Tokyo
autogenerated on Wed Sep 7 2022 02:51:03