1 /* $Id: tif_predict.c,v 1.32 2010-03-10 18:56:49 bfriesen Exp $ */
2
3 /*
4 * Copyright (c) 1988-1997 Sam Leffler
5 * Copyright (c) 1991-1997 Silicon Graphics, Inc.
6 *
7 * Permission to use, copy, modify, distribute, and sell this software and
8 * its documentation for any purpose is hereby granted without fee, provided
9 * that (i) the above copyright notices and this permission notice appear in
10 * all copies of the software and related documentation, and (ii) the names of
11 * Sam Leffler and Silicon Graphics may not be used in any advertising or
12 * publicity relating to the software without the specific, prior written
13 * permission of Sam Leffler and Silicon Graphics.
14 *
15 * THE SOFTWARE IS PROVIDED "AS-IS" AND WITHOUT WARRANTY OF ANY KIND,
16 * EXPRESS, IMPLIED OR OTHERWISE, INCLUDING WITHOUT LIMITATION, ANY
17 * WARRANTY OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE.
18 *
19 * IN NO EVENT SHALL SAM LEFFLER OR SILICON GRAPHICS BE LIABLE FOR
20 * ANY SPECIAL, INCIDENTAL, INDIRECT OR CONSEQUENTIAL DAMAGES OF ANY KIND,
21 * OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
22 * WHETHER OR NOT ADVISED OF THE POSSIBILITY OF DAMAGE, AND ON ANY THEORY OF
23 * LIABILITY, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
24 * OF THIS SOFTWARE.
25 */
26
27 /*
28 * TIFF Library.
29 *
30 * Predictor Tag Support (used by multiple codecs).
31 */
32 #include "tiffiop.h"
33 #include "tif_predict.h"
34
35 #define PredictorState(tif) ((TIFFPredictorState*) (tif)->tif_data)
36
37 static void horAcc8(TIFF* tif, uint8* cp0, tmsize_t cc);
38 static void horAcc16(TIFF* tif, uint8* cp0, tmsize_t cc);
39 static void horAcc32(TIFF* tif, uint8* cp0, tmsize_t cc);
40 static void swabHorAcc16(TIFF* tif, uint8* cp0, tmsize_t cc);
41 static void swabHorAcc32(TIFF* tif, uint8* cp0, tmsize_t cc);
42 static void horDiff8(TIFF* tif, uint8* cp0, tmsize_t cc);
43 static void horDiff16(TIFF* tif, uint8* cp0, tmsize_t cc);
44 static void horDiff32(TIFF* tif, uint8* cp0, tmsize_t cc);
45 static void fpAcc(TIFF* tif, uint8* cp0, tmsize_t cc);
46 static void fpDiff(TIFF* tif, uint8* cp0, tmsize_t cc);
47 static int PredictorDecodeRow(TIFF* tif, uint8* op0, tmsize_t occ0, uint16 s);
48 static int PredictorDecodeTile(TIFF* tif, uint8* op0, tmsize_t occ0, uint16 s);
49 static int PredictorEncodeRow(TIFF* tif, uint8* bp, tmsize_t cc, uint16 s);
50 static int PredictorEncodeTile(TIFF* tif, uint8* bp0, tmsize_t cc0, uint16 s);
51
52 static int
PredictorSetup(TIFF * tif)53 PredictorSetup(TIFF* tif)
54 {
55 static const char module[] = "PredictorSetup";
56
57 TIFFPredictorState* sp = PredictorState(tif);
58 TIFFDirectory* td = &tif->tif_dir;
59
60 switch (sp->predictor) /* no differencing */
61 {
62 case PREDICTOR_NONE:
63 return 1;
64 case PREDICTOR_HORIZONTAL:
65 if (td->td_bitspersample != 8
66 && td->td_bitspersample != 16
67 && td->td_bitspersample != 32) {
68 TIFFErrorExt(tif->tif_clientdata, module,
69 "Horizontal differencing \"Predictor\" not supported with %d-bit samples",
70 td->td_bitspersample);
71 return 0;
72 }
73 break;
74 case PREDICTOR_FLOATINGPOINT:
75 if (td->td_sampleformat != SAMPLEFORMAT_IEEEFP) {
76 TIFFErrorExt(tif->tif_clientdata, module,
77 "Floating point \"Predictor\" not supported with %d data format",
78 td->td_sampleformat);
79 return 0;
80 }
81 break;
82 default:
83 TIFFErrorExt(tif->tif_clientdata, module,
84 "\"Predictor\" value %d not supported",
85 sp->predictor);
86 return 0;
87 }
88 sp->stride = (td->td_planarconfig == PLANARCONFIG_CONTIG ?
89 td->td_samplesperpixel : 1);
90 /*
91 * Calculate the scanline/tile-width size in bytes.
92 */
93 if (isTiled(tif))
94 sp->rowsize = TIFFTileRowSize(tif);
95 else
96 sp->rowsize = TIFFScanlineSize(tif);
97 if (sp->rowsize == 0)
98 return 0;
99
100 return 1;
101 }
102
103 static int
PredictorSetupDecode(TIFF * tif)104 PredictorSetupDecode(TIFF* tif)
105 {
106 TIFFPredictorState* sp = PredictorState(tif);
107 TIFFDirectory* td = &tif->tif_dir;
108
109 if (!(*sp->setupdecode)(tif) || !PredictorSetup(tif))
110 return 0;
111
112 if (sp->predictor == 2) {
113 switch (td->td_bitspersample) {
114 case 8: sp->decodepfunc = horAcc8; break;
115 case 16: sp->decodepfunc = horAcc16; break;
116 case 32: sp->decodepfunc = horAcc32; break;
117 }
118 /*
119 * Override default decoding method with one that does the
120 * predictor stuff.
121 */
122 if( tif->tif_decoderow != PredictorDecodeRow )
123 {
124 sp->decoderow = tif->tif_decoderow;
125 tif->tif_decoderow = PredictorDecodeRow;
126 sp->decodestrip = tif->tif_decodestrip;
127 tif->tif_decodestrip = PredictorDecodeTile;
128 sp->decodetile = tif->tif_decodetile;
129 tif->tif_decodetile = PredictorDecodeTile;
130 }
131
132 /*
133 * If the data is horizontally differenced 16-bit data that
134 * requires byte-swapping, then it must be byte swapped before
135 * the accumulation step. We do this with a special-purpose
136 * routine and override the normal post decoding logic that
137 * the library setup when the directory was read.
138 */
139 if (tif->tif_flags & TIFF_SWAB) {
140 if (sp->decodepfunc == horAcc16) {
141 sp->decodepfunc = swabHorAcc16;
142 tif->tif_postdecode = _TIFFNoPostDecode;
143 } else if (sp->decodepfunc == horAcc32) {
144 sp->decodepfunc = swabHorAcc32;
145 tif->tif_postdecode = _TIFFNoPostDecode;
146 }
147 }
148 }
149
150 else if (sp->predictor == 3) {
151 sp->decodepfunc = fpAcc;
152 /*
153 * Override default decoding method with one that does the
154 * predictor stuff.
155 */
156 if( tif->tif_decoderow != PredictorDecodeRow )
157 {
158 sp->decoderow = tif->tif_decoderow;
159 tif->tif_decoderow = PredictorDecodeRow;
160 sp->decodestrip = tif->tif_decodestrip;
161 tif->tif_decodestrip = PredictorDecodeTile;
162 sp->decodetile = tif->tif_decodetile;
163 tif->tif_decodetile = PredictorDecodeTile;
164 }
165 /*
166 * The data should not be swapped outside of the floating
167 * point predictor, the accumulation routine should return
168 * byres in the native order.
169 */
170 if (tif->tif_flags & TIFF_SWAB) {
171 tif->tif_postdecode = _TIFFNoPostDecode;
172 }
173 /*
174 * Allocate buffer to keep the decoded bytes before
175 * rearranging in the ight order
176 */
177 }
178
179 return 1;
180 }
181
182 static int
PredictorSetupEncode(TIFF * tif)183 PredictorSetupEncode(TIFF* tif)
184 {
185 TIFFPredictorState* sp = PredictorState(tif);
186 TIFFDirectory* td = &tif->tif_dir;
187
188 if (!(*sp->setupencode)(tif) || !PredictorSetup(tif))
189 return 0;
190
191 if (sp->predictor == 2) {
192 switch (td->td_bitspersample) {
193 case 8: sp->encodepfunc = horDiff8; break;
194 case 16: sp->encodepfunc = horDiff16; break;
195 case 32: sp->encodepfunc = horDiff32; break;
196 }
197 /*
198 * Override default encoding method with one that does the
199 * predictor stuff.
200 */
201 if( tif->tif_encoderow != PredictorEncodeRow )
202 {
203 sp->encoderow = tif->tif_encoderow;
204 tif->tif_encoderow = PredictorEncodeRow;
205 sp->encodestrip = tif->tif_encodestrip;
206 tif->tif_encodestrip = PredictorEncodeTile;
207 sp->encodetile = tif->tif_encodetile;
208 tif->tif_encodetile = PredictorEncodeTile;
209 }
210 }
211
212 else if (sp->predictor == 3) {
213 sp->encodepfunc = fpDiff;
214 /*
215 * Override default encoding method with one that does the
216 * predictor stuff.
217 */
218 if( tif->tif_encoderow != PredictorEncodeRow )
219 {
220 sp->encoderow = tif->tif_encoderow;
221 tif->tif_encoderow = PredictorEncodeRow;
222 sp->encodestrip = tif->tif_encodestrip;
223 tif->tif_encodestrip = PredictorEncodeTile;
224 sp->encodetile = tif->tif_encodetile;
225 tif->tif_encodetile = PredictorEncodeTile;
226 }
227 }
228
229 return 1;
230 }
231
232 #define REPEAT4(n, op) \
233 switch (n) { \
234 default: { tmsize_t i; for (i = n-4; i > 0; i--) { op; } } \
235 case 4: op; \
236 case 3: op; \
237 case 2: op; \
238 case 1: op; \
239 case 0: ; \
240 }
241
242 static void
horAcc8(TIFF * tif,uint8 * cp0,tmsize_t cc)243 horAcc8(TIFF* tif, uint8* cp0, tmsize_t cc)
244 {
245 tmsize_t stride = PredictorState(tif)->stride;
246
247 char* cp = (char*) cp0;
248 assert((cc%stride)==0);
249 if (cc > stride) {
250 /*
251 * Pipeline the most common cases.
252 */
253 if (stride == 3) {
254 unsigned int cr = cp[0];
255 unsigned int cg = cp[1];
256 unsigned int cb = cp[2];
257 cc -= 3;
258 cp += 3;
259 while (cc>0) {
260 cp[0] = (char) (cr += cp[0]);
261 cp[1] = (char) (cg += cp[1]);
262 cp[2] = (char) (cb += cp[2]);
263 cc -= 3;
264 cp += 3;
265 }
266 } else if (stride == 4) {
267 unsigned int cr = cp[0];
268 unsigned int cg = cp[1];
269 unsigned int cb = cp[2];
270 unsigned int ca = cp[3];
271 cc -= 4;
272 cp += 4;
273 while (cc>0) {
274 cp[0] = (char) (cr += cp[0]);
275 cp[1] = (char) (cg += cp[1]);
276 cp[2] = (char) (cb += cp[2]);
277 cp[3] = (char) (ca += cp[3]);
278 cc -= 4;
279 cp += 4;
280 }
281 } else {
282 cc -= stride;
283 do {
284 REPEAT4(stride, cp[stride] =
285 (char) (cp[stride] + *cp); cp++)
286 cc -= stride;
287 } while (cc>0);
288 }
289 }
290 }
291
292 static void
swabHorAcc16(TIFF * tif,uint8 * cp0,tmsize_t cc)293 swabHorAcc16(TIFF* tif, uint8* cp0, tmsize_t cc)
294 {
295 tmsize_t stride = PredictorState(tif)->stride;
296 uint16* wp = (uint16*) cp0;
297 tmsize_t wc = cc / 2;
298
299 assert((cc%(2*stride))==0);
300
301 if (wc > stride) {
302 TIFFSwabArrayOfShort(wp, wc);
303 wc -= stride;
304 do {
305 REPEAT4(stride, wp[stride] += wp[0]; wp++)
306 wc -= stride;
307 } while (wc > 0);
308 }
309 }
310
311 static void
horAcc16(TIFF * tif,uint8 * cp0,tmsize_t cc)312 horAcc16(TIFF* tif, uint8* cp0, tmsize_t cc)
313 {
314 tmsize_t stride = PredictorState(tif)->stride;
315 uint16* wp = (uint16*) cp0;
316 tmsize_t wc = cc / 2;
317
318 assert((cc%(2*stride))==0);
319
320 if (wc > stride) {
321 wc -= stride;
322 do {
323 REPEAT4(stride, wp[stride] += wp[0]; wp++)
324 wc -= stride;
325 } while (wc > 0);
326 }
327 }
328
329 static void
swabHorAcc32(TIFF * tif,uint8 * cp0,tmsize_t cc)330 swabHorAcc32(TIFF* tif, uint8* cp0, tmsize_t cc)
331 {
332 tmsize_t stride = PredictorState(tif)->stride;
333 uint32* wp = (uint32*) cp0;
334 tmsize_t wc = cc / 4;
335
336 assert((cc%(4*stride))==0);
337
338 if (wc > stride) {
339 TIFFSwabArrayOfLong(wp, wc);
340 wc -= stride;
341 do {
342 REPEAT4(stride, wp[stride] += wp[0]; wp++)
343 wc -= stride;
344 } while (wc > 0);
345 }
346 }
347
348 static void
horAcc32(TIFF * tif,uint8 * cp0,tmsize_t cc)349 horAcc32(TIFF* tif, uint8* cp0, tmsize_t cc)
350 {
351 tmsize_t stride = PredictorState(tif)->stride;
352 uint32* wp = (uint32*) cp0;
353 tmsize_t wc = cc / 4;
354
355 assert((cc%(4*stride))==0);
356
357 if (wc > stride) {
358 wc -= stride;
359 do {
360 REPEAT4(stride, wp[stride] += wp[0]; wp++)
361 wc -= stride;
362 } while (wc > 0);
363 }
364 }
365
366 /*
367 * Floating point predictor accumulation routine.
368 */
369 static void
fpAcc(TIFF * tif,uint8 * cp0,tmsize_t cc)370 fpAcc(TIFF* tif, uint8* cp0, tmsize_t cc)
371 {
372 tmsize_t stride = PredictorState(tif)->stride;
373 uint32 bps = tif->tif_dir.td_bitspersample / 8;
374 tmsize_t wc = cc / bps;
375 tmsize_t count = cc;
376 uint8 *cp = (uint8 *) cp0;
377 uint8 *tmp = (uint8 *)_TIFFmalloc(cc);
378
379 assert((cc%(bps*stride))==0);
380
381 if (!tmp)
382 return;
383
384 while (count > stride) {
385 REPEAT4(stride, cp[stride] += cp[0]; cp++)
386 count -= stride;
387 }
388
389 _TIFFmemcpy(tmp, cp0, cc);
390 cp = (uint8 *) cp0;
391 for (count = 0; count < wc; count++) {
392 uint32 byte;
393 for (byte = 0; byte < bps; byte++) {
394 #if WORDS_BIGENDIAN
395 cp[bps * count + byte] = tmp[byte * wc + count];
396 #else
397 cp[bps * count + byte] =
398 tmp[(bps - byte - 1) * wc + count];
399 #endif
400 }
401 }
402 _TIFFfree(tmp);
403 }
404
405 /*
406 * Decode a scanline and apply the predictor routine.
407 */
408 static int
PredictorDecodeRow(TIFF * tif,uint8 * op0,tmsize_t occ0,uint16 s)409 PredictorDecodeRow(TIFF* tif, uint8* op0, tmsize_t occ0, uint16 s)
410 {
411 TIFFPredictorState *sp = PredictorState(tif);
412
413 assert(sp != NULL);
414 assert(sp->decoderow != NULL);
415 assert(sp->decodepfunc != NULL);
416
417 if ((*sp->decoderow)(tif, op0, occ0, s)) {
418 (*sp->decodepfunc)(tif, op0, occ0);
419 return 1;
420 } else
421 return 0;
422 }
423
424 /*
425 * Decode a tile/strip and apply the predictor routine.
426 * Note that horizontal differencing must be done on a
427 * row-by-row basis. The width of a "row" has already
428 * been calculated at pre-decode time according to the
429 * strip/tile dimensions.
430 */
431 static int
PredictorDecodeTile(TIFF * tif,uint8 * op0,tmsize_t occ0,uint16 s)432 PredictorDecodeTile(TIFF* tif, uint8* op0, tmsize_t occ0, uint16 s)
433 {
434 TIFFPredictorState *sp = PredictorState(tif);
435
436 assert(sp != NULL);
437 assert(sp->decodetile != NULL);
438
439 if ((*sp->decodetile)(tif, op0, occ0, s)) {
440 tmsize_t rowsize = sp->rowsize;
441 assert(rowsize > 0);
442 assert((occ0%rowsize)==0);
443 assert(sp->decodepfunc != NULL);
444 while (occ0 > 0) {
445 (*sp->decodepfunc)(tif, op0, rowsize);
446 occ0 -= rowsize;
447 op0 += rowsize;
448 }
449 return 1;
450 } else
451 return 0;
452 }
453
454 static void
horDiff8(TIFF * tif,uint8 * cp0,tmsize_t cc)455 horDiff8(TIFF* tif, uint8* cp0, tmsize_t cc)
456 {
457 TIFFPredictorState* sp = PredictorState(tif);
458 tmsize_t stride = sp->stride;
459 char* cp = (char*) cp0;
460
461 assert((cc%stride)==0);
462
463 if (cc > stride) {
464 cc -= stride;
465 /*
466 * Pipeline the most common cases.
467 */
468 if (stride == 3) {
469 int r1, g1, b1;
470 int r2 = cp[0];
471 int g2 = cp[1];
472 int b2 = cp[2];
473 do {
474 r1 = cp[3]; cp[3] = r1-r2; r2 = r1;
475 g1 = cp[4]; cp[4] = g1-g2; g2 = g1;
476 b1 = cp[5]; cp[5] = b1-b2; b2 = b1;
477 cp += 3;
478 } while ((cc -= 3) > 0);
479 } else if (stride == 4) {
480 int r1, g1, b1, a1;
481 int r2 = cp[0];
482 int g2 = cp[1];
483 int b2 = cp[2];
484 int a2 = cp[3];
485 do {
486 r1 = cp[4]; cp[4] = r1-r2; r2 = r1;
487 g1 = cp[5]; cp[5] = g1-g2; g2 = g1;
488 b1 = cp[6]; cp[6] = b1-b2; b2 = b1;
489 a1 = cp[7]; cp[7] = a1-a2; a2 = a1;
490 cp += 4;
491 } while ((cc -= 4) > 0);
492 } else {
493 cp += cc - 1;
494 do {
495 REPEAT4(stride, cp[stride] -= cp[0]; cp--)
496 } while ((cc -= stride) > 0);
497 }
498 }
499 }
500
501 static void
horDiff16(TIFF * tif,uint8 * cp0,tmsize_t cc)502 horDiff16(TIFF* tif, uint8* cp0, tmsize_t cc)
503 {
504 TIFFPredictorState* sp = PredictorState(tif);
505 tmsize_t stride = sp->stride;
506 int16 *wp = (int16*) cp0;
507 tmsize_t wc = cc/2;
508
509 assert((cc%(2*stride))==0);
510
511 if (wc > stride) {
512 wc -= stride;
513 wp += wc - 1;
514 do {
515 REPEAT4(stride, wp[stride] -= wp[0]; wp--)
516 wc -= stride;
517 } while (wc > 0);
518 }
519 }
520
521 static void
horDiff32(TIFF * tif,uint8 * cp0,tmsize_t cc)522 horDiff32(TIFF* tif, uint8* cp0, tmsize_t cc)
523 {
524 TIFFPredictorState* sp = PredictorState(tif);
525 tmsize_t stride = sp->stride;
526 int32 *wp = (int32*) cp0;
527 tmsize_t wc = cc/4;
528
529 assert((cc%(4*stride))==0);
530
531 if (wc > stride) {
532 wc -= stride;
533 wp += wc - 1;
534 do {
535 REPEAT4(stride, wp[stride] -= wp[0]; wp--)
536 wc -= stride;
537 } while (wc > 0);
538 }
539 }
540
541 /*
542 * Floating point predictor differencing routine.
543 */
544 static void
fpDiff(TIFF * tif,uint8 * cp0,tmsize_t cc)545 fpDiff(TIFF* tif, uint8* cp0, tmsize_t cc)
546 {
547 tmsize_t stride = PredictorState(tif)->stride;
548 uint32 bps = tif->tif_dir.td_bitspersample / 8;
549 tmsize_t wc = cc / bps;
550 tmsize_t count;
551 uint8 *cp = (uint8 *) cp0;
552 uint8 *tmp = (uint8 *)_TIFFmalloc(cc);
553
554 assert((cc%(bps*stride))==0);
555
556 if (!tmp)
557 return;
558
559 _TIFFmemcpy(tmp, cp0, cc);
560 for (count = 0; count < wc; count++) {
561 uint32 byte;
562 for (byte = 0; byte < bps; byte++) {
563 #if WORDS_BIGENDIAN
564 cp[byte * wc + count] = tmp[bps * count + byte];
565 #else
566 cp[(bps - byte - 1) * wc + count] =
567 tmp[bps * count + byte];
568 #endif
569 }
570 }
571 _TIFFfree(tmp);
572
573 cp = (uint8 *) cp0;
574 cp += cc - stride - 1;
575 for (count = cc; count > stride; count -= stride)
576 REPEAT4(stride, cp[stride] -= cp[0]; cp--)
577 }
578
579 static int
PredictorEncodeRow(TIFF * tif,uint8 * bp,tmsize_t cc,uint16 s)580 PredictorEncodeRow(TIFF* tif, uint8* bp, tmsize_t cc, uint16 s)
581 {
582 TIFFPredictorState *sp = PredictorState(tif);
583
584 assert(sp != NULL);
585 assert(sp->encodepfunc != NULL);
586 assert(sp->encoderow != NULL);
587
588 /* XXX horizontal differencing alters user's data XXX */
589 (*sp->encodepfunc)(tif, bp, cc);
590 return (*sp->encoderow)(tif, bp, cc, s);
591 }
592
593 static int
PredictorEncodeTile(TIFF * tif,uint8 * bp0,tmsize_t cc0,uint16 s)594 PredictorEncodeTile(TIFF* tif, uint8* bp0, tmsize_t cc0, uint16 s)
595 {
596 static const char module[] = "PredictorEncodeTile";
597 TIFFPredictorState *sp = PredictorState(tif);
598 uint8 *working_copy;
599 tmsize_t cc = cc0, rowsize;
600 unsigned char* bp;
601 int result_code;
602
603 assert(sp != NULL);
604 assert(sp->encodepfunc != NULL);
605 assert(sp->encodetile != NULL);
606
607 /*
608 * Do predictor manipulation in a working buffer to avoid altering
609 * the callers buffer. http://trac.osgeo.org/gdal/ticket/1965
610 */
611 working_copy = (uint8*) _TIFFmalloc(cc0);
612 if( working_copy == NULL )
613 {
614 TIFFErrorExt(tif->tif_clientdata, module,
615 "Out of memory allocating " TIFF_SSIZE_FORMAT " byte temp buffer.",
616 cc0 );
617 return 0;
618 }
619 memcpy( working_copy, bp0, cc0 );
620 bp = working_copy;
621
622 rowsize = sp->rowsize;
623 assert(rowsize > 0);
624 assert((cc0%rowsize)==0);
625 while (cc > 0) {
626 (*sp->encodepfunc)(tif, bp, rowsize);
627 cc -= rowsize;
628 bp += rowsize;
629 }
630 result_code = (*sp->encodetile)(tif, working_copy, cc0, s);
631
632 _TIFFfree( working_copy );
633
634 return result_code;
635 }
636
637 #define FIELD_PREDICTOR (FIELD_CODEC+0) /* XXX */
638
639 static const TIFFField predictFields[] = {
640 { TIFFTAG_PREDICTOR, 1, 1, TIFF_SHORT, 0, TIFF_SETGET_UINT16, TIFF_SETGET_UINT16, FIELD_PREDICTOR, FALSE, FALSE, "Predictor", NULL },
641 };
642
643 static int
PredictorVSetField(TIFF * tif,uint32 tag,va_list ap)644 PredictorVSetField(TIFF* tif, uint32 tag, va_list ap)
645 {
646 TIFFPredictorState *sp = PredictorState(tif);
647
648 assert(sp != NULL);
649 assert(sp->vsetparent != NULL);
650
651 switch (tag) {
652 case TIFFTAG_PREDICTOR:
653 sp->predictor = (uint16) va_arg(ap, uint16_vap);
654 TIFFSetFieldBit(tif, FIELD_PREDICTOR);
655 break;
656 default:
657 return (*sp->vsetparent)(tif, tag, ap);
658 }
659 tif->tif_flags |= TIFF_DIRTYDIRECT;
660 return 1;
661 }
662
663 static int
PredictorVGetField(TIFF * tif,uint32 tag,va_list ap)664 PredictorVGetField(TIFF* tif, uint32 tag, va_list ap)
665 {
666 TIFFPredictorState *sp = PredictorState(tif);
667
668 assert(sp != NULL);
669 assert(sp->vgetparent != NULL);
670
671 switch (tag) {
672 case TIFFTAG_PREDICTOR:
673 *va_arg(ap, uint16*) = sp->predictor;
674 break;
675 default:
676 return (*sp->vgetparent)(tif, tag, ap);
677 }
678 return 1;
679 }
680
681 static void
PredictorPrintDir(TIFF * tif,FILE * fd,long flags)682 PredictorPrintDir(TIFF* tif, FILE* fd, long flags)
683 {
684 TIFFPredictorState* sp = PredictorState(tif);
685
686 (void) flags;
687 if (TIFFFieldSet(tif,FIELD_PREDICTOR)) {
688 fprintf(fd, " Predictor: ");
689 switch (sp->predictor) {
690 case 1: fprintf(fd, "none "); break;
691 case 2: fprintf(fd, "horizontal differencing "); break;
692 case 3: fprintf(fd, "floating point predictor "); break;
693 }
694 fprintf(fd, "%u (0x%x)\n", sp->predictor, sp->predictor);
695 }
696 if (sp->printdir)
697 (*sp->printdir)(tif, fd, flags);
698 }
699
700 int
TIFFPredictorInit(TIFF * tif)701 TIFFPredictorInit(TIFF* tif)
702 {
703 TIFFPredictorState* sp = PredictorState(tif);
704
705 assert(sp != 0);
706
707 /*
708 * Merge codec-specific tag information.
709 */
710 if (!_TIFFMergeFields(tif, predictFields,
711 TIFFArrayCount(predictFields))) {
712 TIFFErrorExt(tif->tif_clientdata, "TIFFPredictorInit",
713 "Merging Predictor codec-specific tags failed");
714 return 0;
715 }
716
717 /*
718 * Override parent get/set field methods.
719 */
720 sp->vgetparent = tif->tif_tagmethods.vgetfield;
721 tif->tif_tagmethods.vgetfield =
722 PredictorVGetField;/* hook for predictor tag */
723 sp->vsetparent = tif->tif_tagmethods.vsetfield;
724 tif->tif_tagmethods.vsetfield =
725 PredictorVSetField;/* hook for predictor tag */
726 sp->printdir = tif->tif_tagmethods.printdir;
727 tif->tif_tagmethods.printdir =
728 PredictorPrintDir; /* hook for predictor tag */
729
730 sp->setupdecode = tif->tif_setupdecode;
731 tif->tif_setupdecode = PredictorSetupDecode;
732 sp->setupencode = tif->tif_setupencode;
733 tif->tif_setupencode = PredictorSetupEncode;
734
735 sp->predictor = 1; /* default value */
736 sp->encodepfunc = NULL; /* no predictor routine */
737 sp->decodepfunc = NULL; /* no predictor routine */
738 return 1;
739 }
740
741 int
TIFFPredictorCleanup(TIFF * tif)742 TIFFPredictorCleanup(TIFF* tif)
743 {
744 TIFFPredictorState* sp = PredictorState(tif);
745
746 assert(sp != 0);
747
748 tif->tif_tagmethods.vgetfield = sp->vgetparent;
749 tif->tif_tagmethods.vsetfield = sp->vsetparent;
750 tif->tif_tagmethods.printdir = sp->printdir;
751 tif->tif_setupdecode = sp->setupdecode;
752 tif->tif_setupencode = sp->setupencode;
753
754 return 1;
755 }
756
757 /* vim: set ts=8 sts=8 sw=8 noet: */
758 /*
759 * Local Variables:
760 * mode: c
761 * c-basic-offset: 8
762 * fill-column: 78
763 * End:
764 */
765