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1 /*
2 * Copyright (c) 1996-1997 Sam Leffler
3 * Copyright (c) 1996 Pixar
4 *
5 * Permission to use, copy, modify, distribute, and sell this software and
6 * its documentation for any purpose is hereby granted without fee, provided
7 * that (i) the above copyright notices and this permission notice appear in
8 * all copies of the software and related documentation, and (ii) the names of
9 * Pixar, Sam Leffler and Silicon Graphics may not be used in any advertising or
10 * publicity relating to the software without the specific, prior written
11 * permission of Pixar, Sam Leffler and Silicon Graphics.
12 *
13 * THE SOFTWARE IS PROVIDED "AS-IS" AND WITHOUT WARRANTY OF ANY KIND,
14 * EXPRESS, IMPLIED OR OTHERWISE, INCLUDING WITHOUT LIMITATION, ANY
15 * WARRANTY OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE.
16 *
17 * IN NO EVENT SHALL PIXAR, SAM LEFFLER OR SILICON GRAPHICS BE LIABLE FOR
18 * ANY SPECIAL, INCIDENTAL, INDIRECT OR CONSEQUENTIAL DAMAGES OF ANY KIND,
19 * OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
20 * WHETHER OR NOT ADVISED OF THE POSSIBILITY OF DAMAGE, AND ON ANY THEORY OF
21 * LIABILITY, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
22 * OF THIS SOFTWARE.
23 */
24
25 #include "tiffiop.h"
26 #ifdef PIXARLOG_SUPPORT
27
28 /*
29 * TIFF Library.
30 * PixarLog Compression Support
31 *
32 * Contributed by Dan McCoy.
33 *
34 * PixarLog film support uses the TIFF library to store companded
35 * 11 bit values into a tiff file, which are compressed using the
36 * zip compressor.
37 *
38 * The codec can take as input and produce as output 32-bit IEEE float values
39 * as well as 16-bit or 8-bit unsigned integer values.
40 *
41 * On writing any of the above are converted into the internal
42 * 11-bit log format. In the case of 8 and 16 bit values, the
43 * input is assumed to be unsigned linear color values that represent
44 * the range 0-1. In the case of IEEE values, the 0-1 range is assumed to
45 * be the normal linear color range, in addition over 1 values are
46 * accepted up to a value of about 25.0 to encode "hot" hightlights and such.
47 * The encoding is lossless for 8-bit values, slightly lossy for the
48 * other bit depths. The actual color precision should be better
49 * than the human eye can perceive with extra room to allow for
50 * error introduced by further image computation. As with any quantized
51 * color format, it is possible to perform image calculations which
52 * expose the quantization error. This format should certainly be less
53 * susceptable to such errors than standard 8-bit encodings, but more
54 * susceptable than straight 16-bit or 32-bit encodings.
55 *
56 * On reading the internal format is converted to the desired output format.
57 * The program can request which format it desires by setting the internal
58 * pseudo tag TIFFTAG_PIXARLOGDATAFMT to one of these possible values:
59 * PIXARLOGDATAFMT_FLOAT = provide IEEE float values.
60 * PIXARLOGDATAFMT_16BIT = provide unsigned 16-bit integer values
61 * PIXARLOGDATAFMT_8BIT = provide unsigned 8-bit integer values
62 *
63 * alternately PIXARLOGDATAFMT_8BITABGR provides unsigned 8-bit integer
64 * values with the difference that if there are exactly three or four channels
65 * (rgb or rgba) it swaps the channel order (bgr or abgr).
66 *
67 * PIXARLOGDATAFMT_11BITLOG provides the internal encoding directly
68 * packed in 16-bit values. However no tools are supplied for interpreting
69 * these values.
70 *
71 * "hot" (over 1.0) areas written in floating point get clamped to
72 * 1.0 in the integer data types.
73 *
74 * When the file is closed after writing, the bit depth and sample format
75 * are set always to appear as if 8-bit data has been written into it.
76 * That way a naive program unaware of the particulars of the encoding
77 * gets the format it is most likely able to handle.
78 *
79 * The codec does it's own horizontal differencing step on the coded
80 * values so the libraries predictor stuff should be turned off.
81 * The codec also handle byte swapping the encoded values as necessary
82 * since the library does not have the information necessary
83 * to know the bit depth of the raw unencoded buffer.
84 *
85 */
86
87 #include "tif_predict.h"
88 #include "zlib.h"
89 #include "zutil.h"
90
91 #include <stdio.h>
92 #include <assert.h>
93 #include <stdlib.h>
94 #include <math.h>
95
96 /* Tables for converting to/from 11 bit coded values */
97
98 #define TSIZE 2048 /* decode table size (11-bit tokens) */
99 #define TSIZEP1 2049 /* Plus one for slop */
100 #define ONE 1250 /* token value of 1.0 exactly */
101 #define RATIO 1.004 /* nominal ratio for log part */
102
103 #define CODE_MASK 0x7ff /* 11 bits. */
104
105 static float Fltsize;
106 static float LogK1, LogK2;
107
108 #define REPEAT(n, op) { int i; i=n; do { i--; op; } while (i>0); }
109
110 static void
111 horizontalAccumulateF(uint16 *wp, int n, int stride, float *op,
112 float *ToLinearF)
113 {
114 register unsigned int cr, cg, cb, ca, mask;
115 register float t0, t1, t2, t3;
116
117 if (n >= stride) {
118 mask = CODE_MASK;
119 if (stride == 3) {
120 t0 = ToLinearF[cr = wp[0]];
121 t1 = ToLinearF[cg = wp[1]];
122 t2 = ToLinearF[cb = wp[2]];
123 op[0] = t0;
124 op[1] = t1;
125 op[2] = t2;
126 n -= 3;
127 while (n > 0) {
128 wp += 3;
129 op += 3;
130 n -= 3;
131 t0 = ToLinearF[(cr += wp[0]) & mask];
132 t1 = ToLinearF[(cg += wp[1]) & mask];
133 t2 = ToLinearF[(cb += wp[2]) & mask];
134 op[0] = t0;
135 op[1] = t1;
136 op[2] = t2;
137 }
138 } else if (stride == 4) {
139 t0 = ToLinearF[cr = wp[0]];
140 t1 = ToLinearF[cg = wp[1]];
141 t2 = ToLinearF[cb = wp[2]];
142 t3 = ToLinearF[ca = wp[3]];
143 op[0] = t0;
144 op[1] = t1;
145 op[2] = t2;
146 op[3] = t3;
147 n -= 4;
148 while (n > 0) {
149 wp += 4;
150 op += 4;
151 n -= 4;
152 t0 = ToLinearF[(cr += wp[0]) & mask];
153 t1 = ToLinearF[(cg += wp[1]) & mask];
154 t2 = ToLinearF[(cb += wp[2]) & mask];
155 t3 = ToLinearF[(ca += wp[3]) & mask];
156 op[0] = t0;
157 op[1] = t1;
158 op[2] = t2;
159 op[3] = t3;
160 }
161 } else {
162 REPEAT(stride, *op = ToLinearF[*wp&mask]; wp++; op++)
163 n -= stride;
164 while (n > 0) {
165 REPEAT(stride,
166 wp[stride] += *wp; *op = ToLinearF[*wp&mask]; wp++; op++)
167 n -= stride;
168 }
169 }
170 }
171 }
172
173 static void
174 horizontalAccumulate12(uint16 *wp, int n, int stride, int16 *op,
175 float *ToLinearF)
176 {
177 register unsigned int cr, cg, cb, ca, mask;
178 register float t0, t1, t2, t3;
179
180 #define SCALE12 2048.0
181 #define CLAMP12(t) (((t) < 3071) ? (uint16) (t) : 3071)
182
183 if (n >= stride) {
184 mask = CODE_MASK;
185 if (stride == 3) {
186 t0 = ToLinearF[cr = wp[0]] * SCALE12;
187 t1 = ToLinearF[cg = wp[1]] * SCALE12;
188 t2 = ToLinearF[cb = wp[2]] * SCALE12;
189 op[0] = CLAMP12(t0);
190 op[1] = CLAMP12(t1);
191 op[2] = CLAMP12(t2);
192 n -= 3;
193 while (n > 0) {
194 wp += 3;
195 op += 3;
196 n -= 3;
197 t0 = ToLinearF[(cr += wp[0]) & mask] * SCALE12;
198 t1 = ToLinearF[(cg += wp[1]) & mask] * SCALE12;
199 t2 = ToLinearF[(cb += wp[2]) & mask] * SCALE12;
200 op[0] = CLAMP12(t0);
201 op[1] = CLAMP12(t1);
202 op[2] = CLAMP12(t2);
203 }
204 } else if (stride == 4) {
205 t0 = ToLinearF[cr = wp[0]] * SCALE12;
206 t1 = ToLinearF[cg = wp[1]] * SCALE12;
207 t2 = ToLinearF[cb = wp[2]] * SCALE12;
208 t3 = ToLinearF[ca = wp[3]] * SCALE12;
209 op[0] = CLAMP12(t0);
210 op[1] = CLAMP12(t1);
211 op[2] = CLAMP12(t2);
212 op[3] = CLAMP12(t3);
213 n -= 4;
214 while (n > 0) {
215 wp += 4;
216 op += 4;
217 n -= 4;
218 t0 = ToLinearF[(cr += wp[0]) & mask] * SCALE12;
219 t1 = ToLinearF[(cg += wp[1]) & mask] * SCALE12;
220 t2 = ToLinearF[(cb += wp[2]) & mask] * SCALE12;
221 t3 = ToLinearF[(ca += wp[3]) & mask] * SCALE12;
222 op[0] = CLAMP12(t0);
223 op[1] = CLAMP12(t1);
224 op[2] = CLAMP12(t2);
225 op[3] = CLAMP12(t3);
226 }
227 } else {
228 REPEAT(stride, t0 = ToLinearF[*wp&mask] * SCALE12;
229 *op = CLAMP12(t0); wp++; op++)
230 n -= stride;
231 while (n > 0) {
232 REPEAT(stride,
233 wp[stride] += *wp; t0 = ToLinearF[wp[stride]&mask]*SCALE12;
234 *op = CLAMP12(t0); wp++; op++)
235 n -= stride;
236 }
237 }
238 }
239 }
240
241 static void
242 horizontalAccumulate16(uint16 *wp, int n, int stride, uint16 *op,
243 uint16 *ToLinear16)
244 {
245 register unsigned int cr, cg, cb, ca, mask;
246
247 if (n >= stride) {
248 mask = CODE_MASK;
249 if (stride == 3) {
250 op[0] = ToLinear16[cr = wp[0]];
251 op[1] = ToLinear16[cg = wp[1]];
252 op[2] = ToLinear16[cb = wp[2]];
253 n -= 3;
254 while (n > 0) {
255 wp += 3;
256 op += 3;
257 n -= 3;
258 op[0] = ToLinear16[(cr += wp[0]) & mask];
259 op[1] = ToLinear16[(cg += wp[1]) & mask];
260 op[2] = ToLinear16[(cb += wp[2]) & mask];
261 }
262 } else if (stride == 4) {
263 op[0] = ToLinear16[cr = wp[0]];
264 op[1] = ToLinear16[cg = wp[1]];
265 op[2] = ToLinear16[cb = wp[2]];
266 op[3] = ToLinear16[ca = wp[3]];
267 n -= 4;
268 while (n > 0) {
269 wp += 4;
270 op += 4;
271 n -= 4;
272 op[0] = ToLinear16[(cr += wp[0]) & mask];
273 op[1] = ToLinear16[(cg += wp[1]) & mask];
274 op[2] = ToLinear16[(cb += wp[2]) & mask];
275 op[3] = ToLinear16[(ca += wp[3]) & mask];
276 }
277 } else {
278 REPEAT(stride, *op = ToLinear16[*wp&mask]; wp++; op++)
279 n -= stride;
280 while (n > 0) {
281 REPEAT(stride,
282 wp[stride] += *wp; *op = ToLinear16[*wp&mask]; wp++; op++)
283 n -= stride;
284 }
285 }
286 }
287 }
288
289 /*
290 * Returns the log encoded 11-bit values with the horizontal
291 * differencing undone.
292 */
293 static void
294 horizontalAccumulate11(uint16 *wp, int n, int stride, uint16 *op)
295 {
296 register unsigned int cr, cg, cb, ca, mask;
297
298 if (n >= stride) {
299 mask = CODE_MASK;
300 if (stride == 3) {
301 op[0] = cr = wp[0]; op[1] = cg = wp[1]; op[2] = cb = wp[2];
302 n -= 3;
303 while (n > 0) {
304 wp += 3;
305 op += 3;
306 n -= 3;
307 op[0] = (cr += wp[0]) & mask;
308 op[1] = (cg += wp[1]) & mask;
309 op[2] = (cb += wp[2]) & mask;
310 }
311 } else if (stride == 4) {
312 op[0] = cr = wp[0]; op[1] = cg = wp[1];
313 op[2] = cb = wp[2]; op[3] = ca = wp[3];
314 n -= 4;
315 while (n > 0) {
316 wp += 4;
317 op += 4;
318 n -= 4;
319 op[0] = (cr += wp[0]) & mask;
320 op[1] = (cg += wp[1]) & mask;
321 op[2] = (cb += wp[2]) & mask;
322 op[3] = (ca += wp[3]) & mask;
323 }
324 } else {
325 REPEAT(stride, *op = *wp&mask; wp++; op++)
326 n -= stride;
327 while (n > 0) {
328 REPEAT(stride,
329 wp[stride] += *wp; *op = *wp&mask; wp++; op++)
330 n -= stride;
331 }
332 }
333 }
334 }
335
336 static void
337 horizontalAccumulate8(uint16 *wp, int n, int stride, unsigned char *op,
338 unsigned char *ToLinear8)
339 {
340 register unsigned int cr, cg, cb, ca, mask;
341
342 if (n >= stride) {
343 mask = CODE_MASK;
344 if (stride == 3) {
345 op[0] = ToLinear8[cr = wp[0]];
346 op[1] = ToLinear8[cg = wp[1]];
347 op[2] = ToLinear8[cb = wp[2]];
348 n -= 3;
349 while (n > 0) {
350 n -= 3;
351 wp += 3;
352 op += 3;
353 op[0] = ToLinear8[(cr += wp[0]) & mask];
354 op[1] = ToLinear8[(cg += wp[1]) & mask];
355 op[2] = ToLinear8[(cb += wp[2]) & mask];
356 }
357 } else if (stride == 4) {
358 op[0] = ToLinear8[cr = wp[0]];
359 op[1] = ToLinear8[cg = wp[1]];
360 op[2] = ToLinear8[cb = wp[2]];
361 op[3] = ToLinear8[ca = wp[3]];
362 n -= 4;
363 while (n > 0) {
364 n -= 4;
365 wp += 4;
366 op += 4;
367 op[0] = ToLinear8[(cr += wp[0]) & mask];
368 op[1] = ToLinear8[(cg += wp[1]) & mask];
369 op[2] = ToLinear8[(cb += wp[2]) & mask];
370 op[3] = ToLinear8[(ca += wp[3]) & mask];
371 }
372 } else {
373 REPEAT(stride, *op = ToLinear8[*wp&mask]; wp++; op++)
374 n -= stride;
375 while (n > 0) {
376 REPEAT(stride,
377 wp[stride] += *wp; *op = ToLinear8[*wp&mask]; wp++; op++)
378 n -= stride;
379 }
380 }
381 }
382 }
383
384
385 static void
386 horizontalAccumulate8abgr(uint16 *wp, int n, int stride, unsigned char *op,
387 unsigned char *ToLinear8)
388 {
389 register unsigned int cr, cg, cb, ca, mask;
390 register unsigned char t0, t1, t2, t3;
391
392 if (n >= stride) {
393 mask = CODE_MASK;
394 if (stride == 3) {
395 op[0] = 0;
396 t1 = ToLinear8[cb = wp[2]];
397 t2 = ToLinear8[cg = wp[1]];
398 t3 = ToLinear8[cr = wp[0]];
399 op[1] = t1;
400 op[2] = t2;
401 op[3] = t3;
402 n -= 3;
403 while (n > 0) {
404 n -= 3;
405 wp += 3;
406 op += 4;
407 op[0] = 0;
408 t1 = ToLinear8[(cb += wp[2]) & mask];
409 t2 = ToLinear8[(cg += wp[1]) & mask];
410 t3 = ToLinear8[(cr += wp[0]) & mask];
411 op[1] = t1;
412 op[2] = t2;
413 op[3] = t3;
414 }
415 } else if (stride == 4) {
416 t0 = ToLinear8[ca = wp[3]];
417 t1 = ToLinear8[cb = wp[2]];
418 t2 = ToLinear8[cg = wp[1]];
419 t3 = ToLinear8[cr = wp[0]];
420 op[0] = t0;
421 op[1] = t1;
422 op[2] = t2;
423 op[3] = t3;
424 n -= 4;
425 while (n > 0) {
426 n -= 4;
427 wp += 4;
428 op += 4;
429 t0 = ToLinear8[(ca += wp[3]) & mask];
430 t1 = ToLinear8[(cb += wp[2]) & mask];
431 t2 = ToLinear8[(cg += wp[1]) & mask];
432 t3 = ToLinear8[(cr += wp[0]) & mask];
433 op[0] = t0;
434 op[1] = t1;
435 op[2] = t2;
436 op[3] = t3;
437 }
438 } else {
439 REPEAT(stride, *op = ToLinear8[*wp&mask]; wp++; op++)
440 n -= stride;
441 while (n > 0) {
442 REPEAT(stride,
443 wp[stride] += *wp; *op = ToLinear8[*wp&mask]; wp++; op++)
444 n -= stride;
445 }
446 }
447 }
448 }
449
450 /*
451 * State block for each open TIFF
452 * file using PixarLog compression/decompression.
453 */
454 typedef struct {
455 TIFFPredictorState predict;
456 z_stream stream;
457 uint16 *tbuf;
458 uint16 stride;
459 int state;
460 int user_datafmt;
461 int quality;
462 #define PLSTATE_INIT 1
463
464 TIFFVSetMethod vgetparent; /* super-class method */
465 TIFFVSetMethod vsetparent; /* super-class method */
466
467 float *ToLinearF;
468 uint16 *ToLinear16;
469 unsigned char *ToLinear8;
470 uint16 *FromLT2;
471 uint16 *From14; /* Really for 16-bit data, but we shift down 2 */
472 uint16 *From8;
473
474 } PixarLogState;
475
476 static int
477 PixarLogMakeTables(PixarLogState *sp)
478 {
479
480 /*
481 * We make several tables here to convert between various external
482 * representations (float, 16-bit, and 8-bit) and the internal
483 * 11-bit companded representation. The 11-bit representation has two
484 * distinct regions. A linear bottom end up through .018316 in steps
485 * of about .000073, and a region of constant ratio up to about 25.
486 * These floating point numbers are stored in the main table ToLinearF.
487 * All other tables are derived from this one. The tables (and the
488 * ratios) are continuous at the internal seam.
489 */
490
491 int nlin, lt2size;
492 int i, j;
493 double b, c, linstep, max;
494 double k, v, dv, r, lr2, r2;
495 float *ToLinearF;
496 uint16 *ToLinear16;
497 unsigned char *ToLinear8;
498 uint16 *FromLT2;
499 uint16 *From14; /* Really for 16-bit data, but we shift down 2 */
500 uint16 *From8;
501
502 c = log(RATIO);
503 nlin = 1./c; /* nlin must be an integer */
504 c = 1./nlin;
505 b = exp(-c*ONE); /* multiplicative scale factor [b*exp(c*ONE) = 1] */
506 linstep = b*c*exp(1.);
507
508 LogK1 = 1./c; /* if (v >= 2) token = k1*log(v*k2) */
509 LogK2 = 1./b;
510 lt2size = (2./linstep)+1;
511 FromLT2 = (uint16 *)_TIFFmalloc(lt2size*sizeof(uint16));
512 From14 = (uint16 *)_TIFFmalloc(16384*sizeof(uint16));
513 From8 = (uint16 *)_TIFFmalloc(256*sizeof(uint16));
514 ToLinearF = (float *)_TIFFmalloc(TSIZEP1 * sizeof(float));
515 ToLinear16 = (uint16 *)_TIFFmalloc(TSIZEP1 * sizeof(uint16));
516 ToLinear8 = (unsigned char *)_TIFFmalloc(TSIZEP1 * sizeof(unsigned char));
517 if (FromLT2 == NULL || From14 == NULL || From8 == NULL ||
518 ToLinearF == NULL || ToLinear16 == NULL || ToLinear8 == NULL) {
519 if (FromLT2) _TIFFfree(FromLT2);
520 if (From14) _TIFFfree(From14);
521 if (From8) _TIFFfree(From8);
522 if (ToLinearF) _TIFFfree(ToLinearF);
523 if (ToLinear16) _TIFFfree(ToLinear16);
524 if (ToLinear8) _TIFFfree(ToLinear8);
525 sp->FromLT2 = NULL;
526 sp->From14 = NULL;
527 sp->From8 = NULL;
528 sp->ToLinearF = NULL;
529 sp->ToLinear16 = NULL;
530 sp->ToLinear8 = NULL;
531 return 0;
532 }
533
534 j = 0;
535
536 for (i = 0; i < nlin; i++) {
537 v = i * linstep;
538 ToLinearF[j++] = v;
539 }
540
541 for (i = nlin; i < TSIZE; i++)
542 ToLinearF[j++] = b*exp(c*i);
543
544 ToLinearF[2048] = ToLinearF[2047];
545
546 for (i = 0; i < TSIZEP1; i++) {
547 v = ToLinearF[i]*65535.0 + 0.5;
548 ToLinear16[i] = (v > 65535.0) ? 65535 : v;
549 v = ToLinearF[i]*255.0 + 0.5;
550 ToLinear8[i] = (v > 255.0) ? 255 : v;
551 }
552
553 j = 0;
554 for (i = 0; i < lt2size; i++) {
555 if ((i*linstep)*(i*linstep) > ToLinearF[j]*ToLinearF[j+1])
556 j++;
557 FromLT2[i] = j;
558 }
559
560 /*
561 * Since we lose info anyway on 16-bit data, we set up a 14-bit
562 * table and shift 16-bit values down two bits on input.
563 * saves a little table space.
564 */
565 j = 0;
566 for (i = 0; i < 16384; i++) {
567 while ((i/16383.)*(i/16383.) > ToLinearF[j]*ToLinearF[j+1])
568 j++;
569 From14[i] = j;
570 }
571
572 j = 0;
573 for (i = 0; i < 256; i++) {
574 while ((i/255.)*(i/255.) > ToLinearF[j]*ToLinearF[j+1])
575 j++;
576 From8[i] = j;
577 }
578
579 Fltsize = lt2size/2;
580
581 sp->ToLinearF = ToLinearF;
582 sp->ToLinear16 = ToLinear16;
583 sp->ToLinear8 = ToLinear8;
584 sp->FromLT2 = FromLT2;
585 sp->From14 = From14;
586 sp->From8 = From8;
587
588 return 1;
589 }
590
591 #define DecoderState(tif) ((PixarLogState*) (tif)->tif_data)
592 #define EncoderState(tif) ((PixarLogState*) (tif)->tif_data)
593
594 static int PixarLogEncode(TIFF*, tidata_t, tsize_t, tsample_t);
595 static int PixarLogDecode(TIFF*, tidata_t, tsize_t, tsample_t);
596
597 #define N(a) (sizeof(a)/sizeof(a[0]))
598 #define PIXARLOGDATAFMT_UNKNOWN -1
599
600 static int
601 PixarLogGuessDataFmt(TIFFDirectory *td)
602 {
603 int guess = PIXARLOGDATAFMT_UNKNOWN;
604 int format = td->td_sampleformat;
605
606 /* If the user didn't tell us his datafmt,
607 * take our best guess from the bitspersample.
608 */
609 switch (td->td_bitspersample) {
610 case 32:
611 if (format == SAMPLEFORMAT_IEEEFP)
612 guess = PIXARLOGDATAFMT_FLOAT;
613 break;
614 case 16:
615 if (format == SAMPLEFORMAT_VOID || format == SAMPLEFORMAT_UINT)
616 guess = PIXARLOGDATAFMT_16BIT;
617 break;
618 case 12:
619 if (format == SAMPLEFORMAT_VOID || format == SAMPLEFORMAT_INT)
620 guess = PIXARLOGDATAFMT_12BITPICIO;
621 break;
622 case 11:
623 if (format == SAMPLEFORMAT_VOID || format == SAMPLEFORMAT_UINT)
624 guess = PIXARLOGDATAFMT_11BITLOG;
625 break;
626 case 8:
627 if (format == SAMPLEFORMAT_VOID || format == SAMPLEFORMAT_UINT)
628 guess = PIXARLOGDATAFMT_8BIT;
629 break;
630 }
631
632 return guess;
633 }
634
635 static int
636 PixarLogSetupDecode(TIFF* tif)
637 {
638 TIFFDirectory *td = &tif->tif_dir;
639 PixarLogState* sp = DecoderState(tif);
640 static const char module[] = "PixarLogSetupDecode";
641
642 assert(sp != NULL);
643
644 /* Make sure no byte swapping happens on the data
645 * after decompression. */
646 tif->tif_postdecode = _TIFFNoPostDecode;
647
648 /* for some reason, we can't do this in TIFFInitPixarLog */
649
650 sp->stride = (td->td_planarconfig == PLANARCONFIG_CONTIG ?
651 td->td_samplesperpixel : 1);
652 sp->tbuf = (uint16 *) _TIFFmalloc(sp->stride *
653 td->td_imagewidth * td->td_rowsperstrip * sizeof(uint16));
654 if (sp->user_datafmt == PIXARLOGDATAFMT_UNKNOWN)
655 sp->user_datafmt = PixarLogGuessDataFmt(td);
656 if (sp->user_datafmt == PIXARLOGDATAFMT_UNKNOWN) {
657 TIFFError(module,
658 "PixarLog compression can't handle bits depth/data format combination (depth: %d)",
659 td->td_bitspersample);
660 return (0);
661 }
662
663 if (inflateInit(&sp->stream) != Z_OK) {
664 TIFFError(module, "%s: %s", tif->tif_name, sp->stream.msg);
665 return (0);
666 } else {
667 sp->state |= PLSTATE_INIT;
668 return (1);
669 }
670 }
671
672 /*
673 * Setup state for decoding a strip.
674 */
675 static int
676 PixarLogPreDecode(TIFF* tif, tsample_t s)
677 {
678 TIFFDirectory *td = &tif->tif_dir;
679 PixarLogState* sp = DecoderState(tif);
680
681 (void) s;
682 assert(sp != NULL);
683 sp->stream.next_in = tif->tif_rawdata;
684 sp->stream.avail_in = tif->tif_rawcc;
685 return (inflateReset(&sp->stream) == Z_OK);
686 }
687
688 static int
689 PixarLogDecode(TIFF* tif, tidata_t op, tsize_t occ, tsample_t s)
690 {
691 TIFFDirectory *td = &tif->tif_dir;
692 PixarLogState* sp = DecoderState(tif);
693 static const char module[] = "PixarLogDecode";
694 int i, nsamples, llen;
695 uint16 *up;
696
697 switch (sp->user_datafmt) {
698 case PIXARLOGDATAFMT_FLOAT:
699 nsamples = occ / sizeof(float); /* XXX float == 32 bits */
700 break;
701 case PIXARLOGDATAFMT_16BIT:
702 case PIXARLOGDATAFMT_12BITPICIO:
703 case PIXARLOGDATAFMT_11BITLOG:
704 nsamples = occ / sizeof(uint16); /* XXX uint16 == 16 bits */
705 break;
706 case PIXARLOGDATAFMT_8BIT:
707 case PIXARLOGDATAFMT_8BITABGR:
708 nsamples = occ;
709 break;
710 default:
711 TIFFError(tif->tif_name,
712 "%d bit input not supported in PixarLog",
713 td->td_bitspersample);
714 return 0;
715 }
716
717 llen = sp->stride * td->td_imagewidth;
718
719 (void) s;
720 assert(sp != NULL);
721 sp->stream.next_out = (unsigned char *) sp->tbuf;
722 sp->stream.avail_out = nsamples * sizeof(uint16);
723 do {
724 int state = inflate(&sp->stream, Z_PARTIAL_FLUSH);
725 if (state == Z_STREAM_END) {
726 break; /* XXX */
727 }
728 if (state == Z_DATA_ERROR) {
729 TIFFError(module,
730 "%s: Decoding error at scanline %d, %s",
731 tif->tif_name, tif->tif_row, sp->stream.msg);
732 if (inflateSync(&sp->stream) != Z_OK)
733 return (0);
734 continue;
735 }
736 if (state != Z_OK) {
737 TIFFError(module, "%s: zlib error: %s",
738 tif->tif_name, sp->stream.msg);
739 return (0);
740 }
741 } while (sp->stream.avail_out > 0);
742
743 /* hopefully, we got all the bytes we needed */
744 if (sp->stream.avail_out != 0) {
745 TIFFError(module,
746 "%s: Not enough data at scanline %d (short %d bytes)",
747 tif->tif_name, tif->tif_row, sp->stream.avail_out);
748 return (0);
749 }
750
751 up = sp->tbuf;
752 /* Swap bytes in the data if from a different endian machine. */
753 if (tif->tif_flags & TIFF_SWAB)
754 TIFFSwabArrayOfShort(up, nsamples);
755
756 for (i = 0; i < nsamples; i += llen, up += llen) {
757 switch (sp->user_datafmt) {
758 case PIXARLOGDATAFMT_FLOAT:
759 horizontalAccumulateF(up, llen, sp->stride,
760 (float *)op, sp->ToLinearF);
761 op += llen * sizeof(float);
762 break;
763 case PIXARLOGDATAFMT_16BIT:
764 horizontalAccumulate16(up, llen, sp->stride,
765 (uint16 *)op, sp->ToLinear16);
766 op += llen * sizeof(uint16);
767 break;
768 case PIXARLOGDATAFMT_12BITPICIO:
769 horizontalAccumulate12(up, llen, sp->stride,
770 (int16 *)op, sp->ToLinearF);
771 op += llen * sizeof(int16);
772 break;
773 case PIXARLOGDATAFMT_11BITLOG:
774 horizontalAccumulate11(up, llen, sp->stride,
775 (uint16 *)op);
776 op += llen * sizeof(uint16);
777 break;
778 case PIXARLOGDATAFMT_8BIT:
779 horizontalAccumulate8(up, llen, sp->stride,
780 (unsigned char *)op, sp->ToLinear8);
781 op += llen * sizeof(unsigned char);
782 break;
783 case PIXARLOGDATAFMT_8BITABGR:
784 horizontalAccumulate8abgr(up, llen, sp->stride,
785 (unsigned char *)op, sp->ToLinear8);
786 op += llen * sizeof(unsigned char);
787 break;
788 default:
789 TIFFError(tif->tif_name,
790 "PixarLogDecode: unsupported bits/sample: %d",
791 td->td_bitspersample);
792 return (0);
793 }
794 }
795
796 return (1);
797 }
798
799 static int
800 PixarLogSetupEncode(TIFF* tif)
801 {
802 TIFFDirectory *td = &tif->tif_dir;
803 PixarLogState* sp = EncoderState(tif);
804 static const char module[] = "PixarLogSetupEncode";
805
806 assert(sp != NULL);
807
808 /* for some reason, we can't do this in TIFFInitPixarLog */
809
810 sp->stride = (td->td_planarconfig == PLANARCONFIG_CONTIG ?
811 td->td_samplesperpixel : 1);
812 sp->tbuf = (uint16 *) _TIFFmalloc(sp->stride *
813 td->td_imagewidth * td->td_rowsperstrip * sizeof(uint16));
814 if (sp->user_datafmt == PIXARLOGDATAFMT_UNKNOWN)
815 sp->user_datafmt = PixarLogGuessDataFmt(td);
816 if (sp->user_datafmt == PIXARLOGDATAFMT_UNKNOWN) {
817 TIFFError(module, "PixarLog compression can't handle %d bit linear encodings", td->td_bitspersample);
818 return (0);
819 }
820
821 if (deflateInit(&sp->stream, sp->quality) != Z_OK) {
822 TIFFError(module, "%s: %s", tif->tif_name, sp->stream.msg);
823 return (0);
824 } else {
825 sp->state |= PLSTATE_INIT;
826 return (1);
827 }
828 }
829
830 /*
831 * Reset encoding state at the start of a strip.
832 */
833 static int
834 PixarLogPreEncode(TIFF* tif, tsample_t s)
835 {
836 TIFFDirectory *td = &tif->tif_dir;
837 PixarLogState *sp = EncoderState(tif);
838
839 (void) s;
840 assert(sp != NULL);
841 sp->stream.next_out = tif->tif_rawdata;
842 sp->stream.avail_out = tif->tif_rawdatasize;
843 return (deflateReset(&sp->stream) == Z_OK);
844 }
845
846 static void
847 horizontalDifferenceF(float *ip, int n, int stride, uint16 *wp, uint16 *FromLT2)
848 {
849
850 register int r1, g1, b1, a1, r2, g2, b2, a2, mask;
851 register float fltsize = Fltsize;
852
853 #define CLAMP(v) ( (v<(float)0.) ? 0 \
854 : (v<(float)2.) ? FromLT2[(int)(v*fltsize)] \
855 : (v>(float)24.2) ? 2047 \
856 : LogK1*log(v*LogK2) + 0.5 )
857
858 mask = CODE_MASK;
859 if (n >= stride) {
860 if (stride == 3) {
861 r2 = wp[0] = CLAMP(ip[0]); g2 = wp[1] = CLAMP(ip[1]);
862 b2 = wp[2] = CLAMP(ip[2]);
863 n -= 3;
864 while (n > 0) {
865 n -= 3;
866 wp += 3;
867 ip += 3;
868 r1 = CLAMP(ip[0]); wp[0] = (r1-r2) & mask; r2 = r1;
869 g1 = CLAMP(ip[1]); wp[1] = (g1-g2) & mask; g2 = g1;
870 b1 = CLAMP(ip[2]); wp[2] = (b1-b2) & mask; b2 = b1;
871 }
872 } else if (stride == 4) {
873 r2 = wp[0] = CLAMP(ip[0]); g2 = wp[1] = CLAMP(ip[1]);
874 b2 = wp[2] = CLAMP(ip[2]); a2 = wp[3] = CLAMP(ip[3]);
875 n -= 4;
876 while (n > 0) {
877 n -= 4;
878 wp += 4;
879 ip += 4;
880 r1 = CLAMP(ip[0]); wp[0] = (r1-r2) & mask; r2 = r1;
881 g1 = CLAMP(ip[1]); wp[1] = (g1-g2) & mask; g2 = g1;
882 b1 = CLAMP(ip[2]); wp[2] = (b1-b2) & mask; b2 = b1;
883 a1 = CLAMP(ip[3]); wp[3] = (a1-a2) & mask; a2 = a1;
884 }
885 } else {
886 ip += n - 1; /* point to last one */
887 wp += n - 1; /* point to last one */
888 n -= stride;
889 while (n > 0) {
890 REPEAT(stride, wp[0] = CLAMP(ip[0]);
891 wp[stride] -= wp[0];
892 wp[stride] &= mask;
893 wp--; ip--)
894 n -= stride;
895 }
896 REPEAT(stride, wp[0] = CLAMP(ip[0]); wp--; ip--)
897 }
898 }
899 }
900
901 static void
902 horizontalDifference16(unsigned short *ip, int n, int stride,
903 unsigned short *wp, uint16 *From14)
904 {
905 register int r1, g1, b1, a1, r2, g2, b2, a2, mask;
906
907 /* assumption is unsigned pixel values */
908 #undef CLAMP
909 #define CLAMP(v) From14[(v) >> 2]
910
911 mask = CODE_MASK;
912 if (n >= stride) {
913 if (stride == 3) {
914 r2 = wp[0] = CLAMP(ip[0]); g2 = wp[1] = CLAMP(ip[1]);
915 b2 = wp[2] = CLAMP(ip[2]);
916 n -= 3;
917 while (n > 0) {
918 n -= 3;
919 wp += 3;
920 ip += 3;
921 r1 = CLAMP(ip[0]); wp[0] = (r1-r2) & mask; r2 = r1;
922 g1 = CLAMP(ip[1]); wp[1] = (g1-g2) & mask; g2 = g1;
923 b1 = CLAMP(ip[2]); wp[2] = (b1-b2) & mask; b2 = b1;
924 }
925 } else if (stride == 4) {
926 r2 = wp[0] = CLAMP(ip[0]); g2 = wp[1] = CLAMP(ip[1]);
927 b2 = wp[2] = CLAMP(ip[2]); a2 = wp[3] = CLAMP(ip[3]);
928 n -= 4;
929 while (n > 0) {
930 n -= 4;
931 wp += 4;
932 ip += 4;
933 r1 = CLAMP(ip[0]); wp[0] = (r1-r2) & mask; r2 = r1;
934 g1 = CLAMP(ip[1]); wp[1] = (g1-g2) & mask; g2 = g1;
935 b1 = CLAMP(ip[2]); wp[2] = (b1-b2) & mask; b2 = b1;
936 a1 = CLAMP(ip[3]); wp[3] = (a1-a2) & mask; a2 = a1;
937 }
938 } else {
939 ip += n - 1; /* point to last one */
940 wp += n - 1; /* point to last one */
941 n -= stride;
942 while (n > 0) {
943 REPEAT(stride, wp[0] = CLAMP(ip[0]);
944 wp[stride] -= wp[0];
945 wp[stride] &= mask;
946 wp--; ip--)
947 n -= stride;
948 }
949 REPEAT(stride, wp[0] = CLAMP(ip[0]); wp--; ip--)
950 }
951 }
952 }
953
954
955 static void
956 horizontalDifference8(unsigned char *ip, int n, int stride,
957 unsigned short *wp, uint16 *From8)
958 {
959 register int r1, g1, b1, a1, r2, g2, b2, a2, mask;
960
961 #undef CLAMP
962 #define CLAMP(v) (From8[(v)])
963
964 mask = CODE_MASK;
965 if (n >= stride) {
966 if (stride == 3) {
967 r2 = wp[0] = CLAMP(ip[0]); g2 = wp[1] = CLAMP(ip[1]);
968 b2 = wp[2] = CLAMP(ip[2]);
969 n -= 3;
970 while (n > 0) {
971 n -= 3;
972 r1 = CLAMP(ip[3]); wp[3] = (r1-r2) & mask; r2 = r1;
973 g1 = CLAMP(ip[4]); wp[4] = (g1-g2) & mask; g2 = g1;
974 b1 = CLAMP(ip[5]); wp[5] = (b1-b2) & mask; b2 = b1;
975 wp += 3;
976 ip += 3;
977 }
978 } else if (stride == 4) {
979 r2 = wp[0] = CLAMP(ip[0]); g2 = wp[1] = CLAMP(ip[1]);
980 b2 = wp[2] = CLAMP(ip[2]); a2 = wp[3] = CLAMP(ip[3]);
981 n -= 4;
982 while (n > 0) {
983 n -= 4;
984 r1 = CLAMP(ip[4]); wp[4] = (r1-r2) & mask; r2 = r1;
985 g1 = CLAMP(ip[5]); wp[5] = (g1-g2) & mask; g2 = g1;
986 b1 = CLAMP(ip[6]); wp[6] = (b1-b2) & mask; b2 = b1;
987 a1 = CLAMP(ip[7]); wp[7] = (a1-a2) & mask; a2 = a1;
988 wp += 4;
989 ip += 4;
990 }
991 } else {
992 wp += n + stride - 1; /* point to last one */
993 ip += n + stride - 1; /* point to last one */
994 n -= stride;
995 while (n > 0) {
996 REPEAT(stride, wp[0] = CLAMP(ip[0]);
997 wp[stride] -= wp[0];
998 wp[stride] &= mask;
999 wp--; ip--)
1000 n -= stride;
1001 }
1002 REPEAT(stride, wp[0] = CLAMP(ip[0]); wp--; ip--)
1003 }
1004 }
1005 }
1006
1007 /*
1008 * Encode a chunk of pixels.
1009 */
1010 static int
1011 PixarLogEncode(TIFF* tif, tidata_t bp, tsize_t cc, tsample_t s)
1012 {
1013 TIFFDirectory *td = &tif->tif_dir;
1014 PixarLogState *sp = EncoderState(tif);
1015 static const char module[] = "PixarLogEncode";
1016 int i, n, llen;
1017 unsigned short * up;
1018
1019 (void) s;
1020
1021 switch (sp->user_datafmt) {
1022 case PIXARLOGDATAFMT_FLOAT:
1023 n = cc / sizeof(float); /* XXX float == 32 bits */
1024 break;
1025 case PIXARLOGDATAFMT_16BIT:
1026 case PIXARLOGDATAFMT_12BITPICIO:
1027 case PIXARLOGDATAFMT_11BITLOG:
1028 n = cc / sizeof(uint16); /* XXX uint16 == 16 bits */
1029 break;
1030 case PIXARLOGDATAFMT_8BIT:
1031 case PIXARLOGDATAFMT_8BITABGR:
1032 n = cc;
1033 break;
1034 default:
1035 TIFFError(tif->tif_name,
1036 "%d bit input not supported in PixarLog",
1037 td->td_bitspersample);
1038 return 0;
1039 }
1040
1041 llen = sp->stride * td->td_imagewidth;
1042
1043 for (i = 0, up = sp->tbuf; i < n; i += llen, up += llen) {
1044 switch (sp->user_datafmt) {
1045 case PIXARLOGDATAFMT_FLOAT:
1046 horizontalDifferenceF((float *)bp, llen,
1047 sp->stride, up, sp->FromLT2);
1048 bp += llen * sizeof(float);
1049 break;
1050 case PIXARLOGDATAFMT_16BIT:
1051 horizontalDifference16((uint16 *)bp, llen,
1052 sp->stride, up, sp->From14);
1053 bp += llen * sizeof(uint16);
1054 break;
1055 case PIXARLOGDATAFMT_8BIT:
1056 horizontalDifference8((unsigned char *)bp, llen,
1057 sp->stride, up, sp->From8);
1058 bp += llen * sizeof(unsigned char);
1059 break;
1060 default:
1061 TIFFError(tif->tif_name,
1062 "%d bit input not supported in PixarLog",
1063 td->td_bitspersample);
1064 return 0;
1065 }
1066 }
1067
1068 sp->stream.next_in = (unsigned char *) sp->tbuf;
1069 sp->stream.avail_in = n * sizeof(uint16);
1070
1071 do {
1072 if (deflate(&sp->stream, Z_NO_FLUSH) != Z_OK) {
1073 TIFFError(module, "%s: Encoder error: %s",
1074 tif->tif_name, sp->stream.msg);
1075 return (0);
1076 }
1077 if (sp->stream.avail_out == 0) {
1078 tif->tif_rawcc = tif->tif_rawdatasize;
1079 TIFFFlushData1(tif);
1080 sp->stream.next_out = tif->tif_rawdata;
1081 sp->stream.avail_out = tif->tif_rawdatasize;
1082 }
1083 } while (sp->stream.avail_in > 0);
1084 return (1);
1085 }
1086
1087 /*
1088 * Finish off an encoded strip by flushing the last
1089 * string and tacking on an End Of Information code.
1090 */
1091
1092 static int
1093 PixarLogPostEncode(TIFF* tif)
1094 {
1095 PixarLogState *sp = EncoderState(tif);
1096 static const char module[] = "PixarLogPostEncode";
1097 int state;
1098
1099 sp->stream.avail_in = 0;
1100
1101 do {
1102 state = deflate(&sp->stream, Z_FINISH);
1103 switch (state) {
1104 case Z_STREAM_END:
1105 case Z_OK:
1106 if (sp->stream.avail_out != tif->tif_rawdatasize) {
1107 tif->tif_rawcc =
1108 tif->tif_rawdatasize - sp->stream.avail_out;
1109 TIFFFlushData1(tif);
1110 sp->stream.next_out = tif->tif_rawdata;
1111 sp->stream.avail_out = tif->tif_rawdatasize;
1112 }
1113 break;
1114 default:
1115 TIFFError(module, "%s: zlib error: %s",
1116 tif->tif_name, sp->stream.msg);
1117 return (0);
1118 }
1119 } while (state != Z_STREAM_END);
1120 return (1);
1121 }
1122
1123 static void
1124 PixarLogClose(TIFF* tif)
1125 {
1126 TIFFDirectory *td = &tif->tif_dir;
1127
1128 /* In a really sneaky maneuver, on close, we covertly modify both
1129 * bitspersample and sampleformat in the directory to indicate
1130 * 8-bit linear. This way, the decode "just works" even for
1131 * readers that don't know about PixarLog, or how to set
1132 * the PIXARLOGDATFMT pseudo-tag.
1133 */
1134 td->td_bitspersample = 8;
1135 td->td_sampleformat = SAMPLEFORMAT_UINT;
1136 }
1137
1138 static void
1139 PixarLogCleanup(TIFF* tif)
1140 {
1141 PixarLogState* sp = (PixarLogState*) tif->tif_data;
1142
1143 if (sp) {
1144 if (sp->FromLT2) _TIFFfree(sp->FromLT2);
1145 if (sp->From14) _TIFFfree(sp->From14);
1146 if (sp->From8) _TIFFfree(sp->From8);
1147 if (sp->ToLinearF) _TIFFfree(sp->ToLinearF);
1148 if (sp->ToLinear16) _TIFFfree(sp->ToLinear16);
1149 if (sp->ToLinear8) _TIFFfree(sp->ToLinear8);
1150 if (sp->state&PLSTATE_INIT) {
1151 if (tif->tif_mode == O_RDONLY)
1152 inflateEnd(&sp->stream);
1153 else
1154 deflateEnd(&sp->stream);
1155 }
1156 if (sp->tbuf)
1157 _TIFFfree(sp->tbuf);
1158 _TIFFfree(sp);
1159 tif->tif_data = NULL;
1160 }
1161 }
1162
1163 static int
1164 PixarLogVSetField(TIFF* tif, ttag_t tag, va_list ap)
1165 {
1166 PixarLogState *sp = (PixarLogState *)tif->tif_data;
1167 int result;
1168 static const char module[] = "PixarLogVSetField";
1169
1170 switch (tag) {
1171 case TIFFTAG_PIXARLOGQUALITY:
1172 sp->quality = va_arg(ap, int);
1173 if (tif->tif_mode != O_RDONLY && (sp->state&PLSTATE_INIT)) {
1174 if (deflateParams(&sp->stream,
1175 sp->quality, Z_DEFAULT_STRATEGY) != Z_OK) {
1176 TIFFError(module, "%s: zlib error: %s",
1177 tif->tif_name, sp->stream.msg);
1178 return (0);
1179 }
1180 }
1181 return (1);
1182 case TIFFTAG_PIXARLOGDATAFMT:
1183 sp->user_datafmt = va_arg(ap, int);
1184 /* Tweak the TIFF header so that the rest of libtiff knows what
1185 * size of data will be passed between app and library, and
1186 * assume that the app knows what it is doing and is not
1187 * confused by these header manipulations...
1188 */
1189 switch (sp->user_datafmt) {
1190 case PIXARLOGDATAFMT_8BIT:
1191 case PIXARLOGDATAFMT_8BITABGR:
1192 TIFFSetField(tif, TIFFTAG_BITSPERSAMPLE, 8);
1193 TIFFSetField(tif, TIFFTAG_SAMPLEFORMAT, SAMPLEFORMAT_UINT);
1194 break;
1195 case PIXARLOGDATAFMT_11BITLOG:
1196 TIFFSetField(tif, TIFFTAG_BITSPERSAMPLE, 16);
1197 TIFFSetField(tif, TIFFTAG_SAMPLEFORMAT, SAMPLEFORMAT_UINT);
1198 break;
1199 case PIXARLOGDATAFMT_12BITPICIO:
1200 TIFFSetField(tif, TIFFTAG_BITSPERSAMPLE, 16);
1201 TIFFSetField(tif, TIFFTAG_SAMPLEFORMAT, SAMPLEFORMAT_INT);
1202 break;
1203 case PIXARLOGDATAFMT_16BIT:
1204 TIFFSetField(tif, TIFFTAG_BITSPERSAMPLE, 16);
1205 TIFFSetField(tif, TIFFTAG_SAMPLEFORMAT, SAMPLEFORMAT_UINT);
1206 break;
1207 case PIXARLOGDATAFMT_FLOAT:
1208 TIFFSetField(tif, TIFFTAG_BITSPERSAMPLE, 32);
1209 TIFFSetField(tif, TIFFTAG_SAMPLEFORMAT, SAMPLEFORMAT_IEEEFP);
1210 break;
1211 }
1212 /*
1213 * Must recalculate sizes should bits/sample change.
1214 */
1215 tif->tif_tilesize = TIFFTileSize(tif);
1216 tif->tif_scanlinesize = TIFFScanlineSize(tif);
1217 result = 1; /* NB: pseudo tag */
1218 break;
1219 default:
1220 result = (*sp->vsetparent)(tif, tag, ap);
1221 }
1222 return (result);
1223 }
1224
1225 static int
1226 PixarLogVGetField(TIFF* tif, ttag_t tag, va_list ap)
1227 {
1228 PixarLogState *sp = (PixarLogState *)tif->tif_data;
1229
1230 switch (tag) {
1231 case TIFFTAG_PIXARLOGQUALITY:
1232 *va_arg(ap, int*) = sp->quality;
1233 break;
1234 case TIFFTAG_PIXARLOGDATAFMT:
1235 *va_arg(ap, int*) = sp->user_datafmt;
1236 break;
1237 default:
1238 return (*sp->vgetparent)(tif, tag, ap);
1239 }
1240 return (1);
1241 }
1242
1243 static const TIFFFieldInfo pixarlogFieldInfo[] = {
1244 {TIFFTAG_PIXARLOGDATAFMT,0,0,TIFF_ANY, FIELD_PSEUDO,FALSE,FALSE,""},
1245 {TIFFTAG_PIXARLOGQUALITY,0,0,TIFF_ANY, FIELD_PSEUDO,FALSE,FALSE,""}
1246 };
1247
1248 int
1249 TIFFInitPixarLog(TIFF* tif, int scheme)
1250 {
1251 PixarLogState* sp;
1252
1253 assert(scheme == COMPRESSION_PIXARLOG);
1254
1255 /*
1256 * Allocate state block so tag methods have storage to record values.
1257 */
1258 tif->tif_data = (tidata_t) _TIFFmalloc(sizeof (PixarLogState));
1259 if (tif->tif_data == NULL)
1260 goto bad;
1261 sp = (PixarLogState*) tif->tif_data;
1262 memset(sp, 0, sizeof (*sp));
1263 sp->stream.data_type = Z_BINARY;
1264 sp->user_datafmt = PIXARLOGDATAFMT_UNKNOWN;
1265
1266 /*
1267 * Install codec methods.
1268 */
1269 tif->tif_setupdecode = PixarLogSetupDecode;
1270 tif->tif_predecode = PixarLogPreDecode;
1271 tif->tif_decoderow = PixarLogDecode;
1272 tif->tif_decodestrip = PixarLogDecode;
1273 tif->tif_decodetile = PixarLogDecode;
1274 tif->tif_setupencode = PixarLogSetupEncode;
1275 tif->tif_preencode = PixarLogPreEncode;
1276 tif->tif_postencode = PixarLogPostEncode;
1277 tif->tif_encoderow = PixarLogEncode;
1278 tif->tif_encodestrip = PixarLogEncode;
1279 tif->tif_encodetile = PixarLogEncode;
1280 tif->tif_close = PixarLogClose;
1281 tif->tif_cleanup = PixarLogCleanup;
1282
1283 /* Override SetField so we can handle our private pseudo-tag */
1284 _TIFFMergeFieldInfo(tif, pixarlogFieldInfo, N(pixarlogFieldInfo));
1285 sp->vgetparent = tif->tif_vgetfield;
1286 tif->tif_vgetfield = PixarLogVGetField; /* hook for codec tags */
1287 sp->vsetparent = tif->tif_vsetfield;
1288 tif->tif_vsetfield = PixarLogVSetField; /* hook for codec tags */
1289
1290 /* Default values for codec-specific fields */
1291 sp->quality = Z_DEFAULT_COMPRESSION; /* default comp. level */
1292 sp->state = 0;
1293
1294 /* we don't wish to use the predictor,
1295 * the default is none, which predictor value 1
1296 */
1297 (void) TIFFPredictorInit(tif);
1298
1299 /*
1300 * build the companding tables
1301 */
1302 PixarLogMakeTables(sp);
1303
1304 return (1);
1305 bad:
1306 TIFFError("TIFFInitPixarLog", "No space for PixarLog state block");
1307 return (0);
1308 }
1309 #endif /* PIXARLOG_SUPPORT */
wxWidgets (Impactor)