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1 /*
2 * Copyright (c) 1997 Greg Ward Larson
3 * Copyright (c) 1997 Silicon Graphics, Inc.
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 * Sam Leffler, Greg Larson and Silicon Graphics may not be used in any
10 * advertising or publicity relating to the software without the specific,
11 * prior written permission of Sam Leffler, Greg Larson 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 SAM LEFFLER, GREG LARSON OR SILICON GRAPHICS BE LIABLE
18 * FOR 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 LOGLUV_SUPPORT
27
28 /*
29 * TIFF Library.
30 * LogLuv compression support for high dynamic range images.
31 *
32 * Contributed by Greg Larson.
33 *
34 * LogLuv image support uses the TIFF library to store 16 or 10-bit
35 * log luminance values with 8 bits each of u and v or a 14-bit index.
36 *
37 * The codec can take as input and produce as output 32-bit IEEE float values
38 * as well as 16-bit integer values. A 16-bit luminance is interpreted
39 * as a sign bit followed by a 15-bit integer that is converted
40 * to and from a linear magnitude using the transformation:
41 *
42 * L = 2^( (Le+.5)/256 - 64 ) # real from 15-bit
43 *
44 * Le = floor( 256*(log2(L) + 64) ) # 15-bit from real
45 *
46 * The actual conversion to world luminance units in candelas per sq. meter
47 * requires an additional multiplier, which is stored in the TIFFTAG_STONITS.
48 * This value is usually set such that a reasonable exposure comes from
49 * clamping decoded luminances above 1 to 1 in the displayed image.
50 *
51 * The 16-bit values for u and v may be converted to real values by dividing
52 * each by 32768. (This allows for negative values, which aren't useful as
53 * far as we know, but are left in case of future improvements in human
54 * color vision.)
55 *
56 * Conversion from (u,v), which is actually the CIE (u',v') system for
57 * you color scientists, is accomplished by the following transformation:
58 *
59 * u = 4*x / (-2*x + 12*y + 3)
60 * v = 9*y / (-2*x + 12*y + 3)
61 *
62 * x = 9*u / (6*u - 16*v + 12)
63 * y = 4*v / (6*u - 16*v + 12)
64 *
65 * This process is greatly simplified by passing 32-bit IEEE floats
66 * for each of three CIE XYZ coordinates. The codec then takes care
67 * of conversion to and from LogLuv, though the application is still
68 * responsible for interpreting the TIFFTAG_STONITS calibration factor.
69 *
70 * The information is compressed into one of two basic encodings, depending on
71 * the setting of the compression tag, which is one of COMPRESSION_SGILOG
72 * or COMPRESSION_SGILOG24. For COMPRESSION_SGILOG, greyscale data is
73 * stored as:
74 *
75 * 1 15
76 * |-+---------------|
77 *
78 * COMPRESSION_SGILOG color data is stored as:
79 *
80 * 1 15 8 8
81 * |-+---------------|--------+--------|
82 * S Le ue ve
83 *
84 * For the 24-bit COMPRESSION_SGILOG24 color format, the data is stored as:
85 *
86 * 10 14
87 * |----------|--------------|
88 * Le' Ce
89 *
90 * There is no sign bit in the 24-bit case, and the (u,v) chromaticity is
91 * encoded as an index for optimal color resolution. The 10 log bits are
92 * defined by the following conversions:
93 *
94 * L = 2^((Le'+.5)/64 - 12) # real from 10-bit
95 *
96 * Le' = floor( 64*(log2(L) + 12) ) # 10-bit from real
97 *
98 * The 10 bits of the smaller format may be converted into the 15 bits of
99 * the larger format by multiplying by 4 and adding 13314. Obviously,
100 * a smaller range of magnitudes is covered (about 5 orders of magnitude
101 * instead of 38), and the lack of a sign bit means that negative luminances
102 * are not allowed. (Well, they aren't allowed in the real world, either,
103 * but they are useful for certain types of image processing.)
104 *
105 * The desired user format is controlled by the setting the internal
106 * pseudo tag TIFFTAG_SGILOGDATAFMT to one of:
107 * SGILOGDATAFMT_FLOAT = IEEE 32-bit float XYZ values
108 * SGILOGDATAFMT_16BIT = 16-bit integer encodings of logL, u and v
109 * Raw data i/o is also possible using:
110 * SGILOGDATAFMT_RAW = 32-bit unsigned integer with encoded pixel
111 * In addition, the following decoding is provided for ease of display:
112 * SGILOGDATAFMT_8BIT = 8-bit default RGB gamma-corrected values
113 *
114 * For grayscale images, we provide the following data formats:
115 * SGILOGDATAFMT_FLOAT = IEEE 32-bit float Y values
116 * SGILOGDATAFMT_16BIT = 16-bit integer w/ encoded luminance
117 * SGILOGDATAFMT_8BIT = 8-bit gray monitor values
118 *
119 * Note that the COMPRESSION_SGILOG applies a simple run-length encoding
120 * scheme by separating the logL, u and v bytes for each row and applying
121 * a PackBits type of compression. Since the 24-bit encoding is not
122 * adaptive, the 32-bit color format takes less space in many cases.
123 */
124
125 #include <stdio.h>
126 #include <assert.h>
127 #include <stdlib.h>
128 #include <math.h>
129
130 /*
131 * State block for each open TIFF
132 * file using LogLuv compression/decompression.
133 */
134 typedef struct logLuvState LogLuvState;
135
136 struct logLuvState {
137 int user_datafmt; /* user data format */
138 int pixel_size; /* bytes per pixel */
139
140 tidata_t* tbuf; /* translation buffer */
141 short tbuflen; /* buffer length */
142 void (*tfunc)(LogLuvState*, tidata_t, int);
143
144 TIFFVSetMethod vgetparent; /* super-class method */
145 TIFFVSetMethod vsetparent; /* super-class method */
146 };
147
148 #define DecoderState(tif) ((LogLuvState*) (tif)->tif_data)
149 #define EncoderState(tif) ((LogLuvState*) (tif)->tif_data)
150
151 #define N(a) (sizeof(a)/sizeof(a[0]))
152 #define SGILOGDATAFMT_UNKNOWN -1
153
154 #define MINRUN 4 /* minimum run length */
155
156 /*
157 * Decode a string of 16-bit gray pixels.
158 */
159 static int LINKAGEMODE
160 LogL16Decode(TIFF* tif, tidata_t op, tsize_t occ, tsample_t s)
161 {
162 LogLuvState* sp = DecoderState(tif);
163 int shft, i, npixels;
164 u_char* bp;
165 int16* tp;
166 int16 b;
167 int cc, rc;
168
169 assert(s == 0);
170 assert(sp != NULL);
171
172 npixels = occ / sp->pixel_size;
173
174 if (sp->user_datafmt == SGILOGDATAFMT_16BIT)
175 tp = (int16*) op;
176 else {
177 assert(sp->tbuflen >= npixels);
178 tp = (int16*) sp->tbuf;
179 }
180 _TIFFmemset((tdata_t) tp, 0, npixels*sizeof (tp[0]));
181
182 bp = (u_char*) tif->tif_rawcp;
183 cc = tif->tif_rawcc;
184 /* get each byte string */
185 for (shft = 2*8; (shft -= 8) >= 0; ) {
186 for (i = 0; i < npixels && cc > 0; )
187 if (*bp >= 128) { /* run */
188 rc = *bp++ + (2-128);
189 b = (int16)*bp++ << shft;
190 cc -= 2;
191 while (rc--)
192 tp[i++] |= b;
193 } else { /* non-run */
194 rc = *bp++; /* nul is noop */
195 while (--cc && rc--)
196 tp[i++] |= (int16)*bp++ << shft;
197 }
198 if (i != npixels) {
199 TIFFError(tif->tif_name,
200 "LogL16Decode: Not enough data at row %d (short %d pixels)",
201 tif->tif_row, npixels - i);
202 tif->tif_rawcp = (tidata_t) bp;
203 tif->tif_rawcc = cc;
204 return (0);
205 }
206 }
207 (*sp->tfunc)(sp, op, npixels);
208 tif->tif_rawcp = (tidata_t) bp;
209 tif->tif_rawcc = cc;
210 return (1);
211 }
212
213 /*
214 * Decode a string of 24-bit pixels.
215 */
216 static int LINKAGEMODE
217 LogLuvDecode24(TIFF* tif, tidata_t op, tsize_t occ, tsample_t s)
218 {
219 LogLuvState* sp = DecoderState(tif);
220 int cc, i, npixels;
221 u_char* bp;
222 uint32* tp;
223
224 assert(s == 0);
225 assert(sp != NULL);
226
227 npixels = occ / sp->pixel_size;
228
229 if (sp->user_datafmt == SGILOGDATAFMT_RAW)
230 tp = (uint32 *)op;
231 else {
232 assert(sp->tbuflen >= npixels);
233 tp = (uint32 *) sp->tbuf;
234 }
235 _TIFFmemset((tdata_t) tp, 0, npixels*sizeof (tp[0]));
236 /* copy to array of uint32 */
237 bp = (u_char*) tif->tif_rawcp;
238 cc = tif->tif_rawcc;
239 for (i = 0; i < npixels && cc > 0; i++) {
240 tp[i] = bp[0] << 16 | bp[1] << 8 | bp[2];
241 bp += 3;
242 cc -= 3;
243 }
244 tif->tif_rawcp = (tidata_t) bp;
245 tif->tif_rawcc = cc;
246 if (i != npixels) {
247 TIFFError(tif->tif_name,
248 "LogLuvDecode24: Not enough data at row %d (short %d pixels)",
249 tif->tif_row, npixels - i);
250 return (0);
251 }
252 (*sp->tfunc)(sp, op, npixels);
253 return (1);
254 }
255
256 /*
257 * Decode a string of 32-bit pixels.
258 */
259 static int LINKAGEMODE
260 LogLuvDecode32(TIFF* tif, tidata_t op, tsize_t occ, tsample_t s)
261 {
262 LogLuvState* sp;
263 int shft, i, npixels;
264 u_char* bp;
265 uint32* tp;
266 uint32 b;
267 int cc, rc;
268
269 assert(s == 0);
270 sp = DecoderState(tif);
271 assert(sp != NULL);
272
273 npixels = occ / sp->pixel_size;
274
275 if (sp->user_datafmt == SGILOGDATAFMT_RAW)
276 tp = (uint32*) op;
277 else {
278 assert(sp->tbuflen >= npixels);
279 tp = (uint32*) sp->tbuf;
280 }
281 _TIFFmemset((tdata_t) tp, 0, npixels*sizeof (tp[0]));
282
283 bp = (u_char*) tif->tif_rawcp;
284 cc = tif->tif_rawcc;
285 /* get each byte string */
286 for (shft = 4*8; (shft -= 8) >= 0; ) {
287 for (i = 0; i < npixels && cc > 0; )
288 if (*bp >= 128) { /* run */
289 rc = *bp++ + (2-128);
290 b = (uint32)*bp++ << shft;
291 cc -= 2;
292 while (rc--)
293 tp[i++] |= b;
294 } else { /* non-run */
295 rc = *bp++; /* nul is noop */
296 while (--cc && rc--)
297 tp[i++] |= (uint32)*bp++ << shft;
298 }
299 if (i != npixels) {
300 TIFFError(tif->tif_name,
301 "LogLuvDecode32: Not enough data at row %d (short %d pixels)",
302 tif->tif_row, npixels - i);
303 tif->tif_rawcp = (tidata_t) bp;
304 tif->tif_rawcc = cc;
305 return (0);
306 }
307 }
308 (*sp->tfunc)(sp, op, npixels);
309 tif->tif_rawcp = (tidata_t) bp;
310 tif->tif_rawcc = cc;
311 return (1);
312 }
313
314 /*
315 * Decode a strip of pixels. We break it into rows to
316 * maintain synchrony with the encode algorithm, which
317 * is row by row.
318 */
319 static int LINKAGEMODE
320 LogLuvDecodeStrip(TIFF* tif, tidata_t bp, tsize_t cc, tsample_t s)
321 {
322 tsize_t rowlen = TIFFScanlineSize(tif);
323
324 assert(cc%rowlen == 0);
325 while (cc && (*tif->tif_decoderow)(tif, bp, rowlen, s))
326 bp += rowlen, cc -= rowlen;
327 return (cc == 0);
328 }
329
330 /*
331 * Decode a tile of pixels. We break it into rows to
332 * maintain synchrony with the encode algorithm, which
333 * is row by row.
334 */
335 static int LINKAGEMODE
336 LogLuvDecodeTile(TIFF* tif, tidata_t bp, tsize_t cc, tsample_t s)
337 {
338 tsize_t rowlen = TIFFTileRowSize(tif);
339
340 assert(cc%rowlen == 0);
341 while (cc && (*tif->tif_decoderow)(tif, bp, rowlen, s))
342 bp += rowlen, cc -= rowlen;
343 return (cc == 0);
344 }
345
346 /*
347 * Encode a row of 16-bit pixels.
348 */
349 static int LINKAGEMODE
350 LogL16Encode(TIFF* tif, tidata_t bp, tsize_t cc, tsample_t s)
351 {
352 LogLuvState* sp = EncoderState(tif);
353 int shft, i, j, npixels;
354 tidata_t op;
355 int16* tp;
356 int16 b;
357 int occ, rc=0, mask, beg;
358
359 assert(s == 0);
360 assert(sp != NULL);
361 npixels = cc / sp->pixel_size;
362
363 if (sp->user_datafmt == SGILOGDATAFMT_16BIT)
364 tp = (int16*) bp;
365 else {
366 tp = (int16*) sp->tbuf;
367 assert(sp->tbuflen >= npixels);
368 (*sp->tfunc)(sp, bp, npixels);
369 }
370 /* compress each byte string */
371 op = tif->tif_rawcp;
372 occ = tif->tif_rawdatasize - tif->tif_rawcc;
373 for (shft = 2*8; (shft -= 8) >= 0; )
374 for (i = 0; i < npixels; i += rc) {
375 if (occ < 4) {
376 tif->tif_rawcp = op;
377 tif->tif_rawcc = tif->tif_rawdatasize - occ;
378 if (!TIFFFlushData1(tif))
379 return (-1);
380 op = tif->tif_rawcp;
381 occ = tif->tif_rawdatasize - tif->tif_rawcc;
382 }
383 mask = 0xff << shft; /* find next run */
384 for (beg = i; beg < npixels; beg += rc) {
385 b = tp[beg] & mask;
386 rc = 1;
387 while (rc < 127+2 && beg+rc < npixels &&
388 (tp[beg+rc] & mask) == b)
389 rc++;
390 if (rc >= MINRUN)
391 break; /* long enough */
392 }
393 if (beg-i > 1 && beg-i < MINRUN) {
394 b = tp[i] & mask; /* check short run */
395 j = i+1;
396 while ((tp[j++] & mask) == b)
397 if (j == beg) {
398 *op++ = 128-2+j-i;
399 *op++ = b >> shft;
400 occ -= 2;
401 i = beg;
402 break;
403 }
404 }
405 while (i < beg) { /* write out non-run */
406 if ((j = beg-i) > 127) j = 127;
407 if (occ < j+3) {
408 tif->tif_rawcp = op;
409 tif->tif_rawcc = tif->tif_rawdatasize - occ;
410 if (!TIFFFlushData1(tif))
411 return (-1);
412 op = tif->tif_rawcp;
413 occ = tif->tif_rawdatasize - tif->tif_rawcc;
414 }
415 *op++ = j; occ--;
416 while (j--) {
417 *op++ = tp[i++] >> shft & 0xff;
418 occ--;
419 }
420 }
421 if (rc >= MINRUN) { /* write out run */
422 *op++ = 128-2+rc;
423 *op++ = tp[beg] >> shft & 0xff;
424 occ -= 2;
425 } else
426 rc = 0;
427 }
428 tif->tif_rawcp = op;
429 tif->tif_rawcc = tif->tif_rawdatasize - occ;
430
431 return (0);
432 }
433
434 /*
435 * Encode a row of 24-bit pixels.
436 */
437 static int LINKAGEMODE
438 LogLuvEncode24(TIFF* tif, tidata_t bp, tsize_t cc, tsample_t s)
439 {
440 LogLuvState* sp = EncoderState(tif);
441 int i, npixels, occ;
442 tidata_t op;
443 uint32* tp;
444
445 assert(s == 0);
446 assert(sp != NULL);
447 npixels = cc / sp->pixel_size;
448
449 if (sp->user_datafmt == SGILOGDATAFMT_RAW)
450 tp = (uint32*) bp;
451 else {
452 tp = (uint32*) sp->tbuf;
453 assert(sp->tbuflen >= npixels);
454 (*sp->tfunc)(sp, bp, npixels);
455 }
456 /* write out encoded pixels */
457 op = tif->tif_rawcp;
458 occ = tif->tif_rawdatasize - tif->tif_rawcc;
459 for (i = npixels; i--; ) {
460 if (occ < 3) {
461 tif->tif_rawcp = op;
462 tif->tif_rawcc = tif->tif_rawdatasize - occ;
463 if (!TIFFFlushData1(tif))
464 return (-1);
465 op = tif->tif_rawcp;
466 occ = tif->tif_rawdatasize - tif->tif_rawcc;
467 }
468 *op++ = *tp >> 16;
469 *op++ = *tp >> 8 & 0xff;
470 *op++ = *tp++ & 0xff;
471 occ -= 3;
472 }
473 tif->tif_rawcp = op;
474 tif->tif_rawcc = tif->tif_rawdatasize - occ;
475
476 return (0);
477 }
478
479 /*
480 * Encode a row of 32-bit pixels.
481 */
482 static int LINKAGEMODE
483 LogLuvEncode32(TIFF* tif, tidata_t bp, tsize_t cc, tsample_t s)
484 {
485 LogLuvState* sp = EncoderState(tif);
486 int shft, i, j, npixels;
487 tidata_t op;
488 uint32* tp;
489 uint32 b;
490 int occ, rc=0, mask, beg;
491
492 assert(s == 0);
493 assert(sp != NULL);
494
495 npixels = cc / sp->pixel_size;
496
497 if (sp->user_datafmt == SGILOGDATAFMT_RAW)
498 tp = (uint32*) bp;
499 else {
500 tp = (uint32*) sp->tbuf;
501 assert(sp->tbuflen >= npixels);
502 (*sp->tfunc)(sp, bp, npixels);
503 }
504 /* compress each byte string */
505 op = tif->tif_rawcp;
506 occ = tif->tif_rawdatasize - tif->tif_rawcc;
507 for (shft = 4*8; (shft -= 8) >= 0; )
508 for (i = 0; i < npixels; i += rc) {
509 if (occ < 4) {
510 tif->tif_rawcp = op;
511 tif->tif_rawcc = tif->tif_rawdatasize - occ;
512 if (!TIFFFlushData1(tif))
513 return (-1);
514 op = tif->tif_rawcp;
515 occ = tif->tif_rawdatasize - tif->tif_rawcc;
516 }
517 mask = 0xff << shft; /* find next run */
518 for (beg = i; beg < npixels; beg += rc) {
519 b = tp[beg] & mask;
520 rc = 1;
521 while (rc < 127+2 && beg+rc < npixels &&
522 (tp[beg+rc] & mask) == b)
523 rc++;
524 if (rc >= MINRUN)
525 break; /* long enough */
526 }
527 if (beg-i > 1 && beg-i < MINRUN) {
528 b = tp[i] & mask; /* check short run */
529 j = i+1;
530 while ((tp[j++] & mask) == b)
531 if (j == beg) {
532 *op++ = 128-2+j-i;
533 *op++ = b >> shft;
534 occ -= 2;
535 i = beg;
536 break;
537 }
538 }
539 while (i < beg) { /* write out non-run */
540 if ((j = beg-i) > 127) j = 127;
541 if (occ < j+3) {
542 tif->tif_rawcp = op;
543 tif->tif_rawcc = tif->tif_rawdatasize - occ;
544 if (!TIFFFlushData1(tif))
545 return (-1);
546 op = tif->tif_rawcp;
547 occ = tif->tif_rawdatasize - tif->tif_rawcc;
548 }
549 *op++ = j; occ--;
550 while (j--) {
551 *op++ = tp[i++] >> shft & 0xff;
552 occ--;
553 }
554 }
555 if (rc >= MINRUN) { /* write out run */
556 *op++ = 128-2+rc;
557 *op++ = tp[beg] >> shft & 0xff;
558 occ -= 2;
559 } else
560 rc = 0;
561 }
562 tif->tif_rawcp = op;
563 tif->tif_rawcc = tif->tif_rawdatasize - occ;
564
565 return (0);
566 }
567
568 /*
569 * Encode a strip of pixels. We break it into rows to
570 * avoid encoding runs across row boundaries.
571 */
572 static int LINKAGEMODE
573 LogLuvEncodeStrip(TIFF* tif, tidata_t bp, tsize_t cc, tsample_t s)
574 {
575 tsize_t rowlen = TIFFScanlineSize(tif);
576
577 assert(cc%rowlen == 0);
578 while (cc && (*tif->tif_encoderow)(tif, bp, rowlen, s) == 0)
579 bp += rowlen, cc -= rowlen;
580 return (cc == 0);
581 }
582
583 /*
584 * Encode a tile of pixels. We break it into rows to
585 * avoid encoding runs across row boundaries.
586 */
587 static int LINKAGEMODE
588 LogLuvEncodeTile(TIFF* tif, tidata_t bp, tsize_t cc, tsample_t s)
589 {
590 tsize_t rowlen = TIFFTileRowSize(tif);
591
592 assert(cc%rowlen == 0);
593 while (cc && (*tif->tif_encoderow)(tif, bp, rowlen, s) == 0)
594 bp += rowlen, cc -= rowlen;
595 return (cc == 0);
596 }
597
598 /*
599 * Encode/Decode functions for converting to and from user formats.
600 */
601 #include "uvcode.h"
602
603 #define U_NEU 0.210526316
604 #define V_NEU 0.473684211
605
606 #ifdef M_LN2
607 #define LOGOF2 M_LN2
608 #else
609 #define LOGOF2 0.69314718055994530942
610 #endif
611 #ifndef log2
612 #define log2(x) ((1./LOGOF2)*log(x))
613 #endif
614 #ifndef exp2
615 #define exp2(x) exp(LOGOF2*(x))
616 #endif
617 #define UVSCALE 410.
618
619 static double
620 pix16toY(int p16)
621 {
622 int Le = p16 & 0x7fff;
623 double Y;
624
625 if (!Le)
626 return (0.);
627 Y = exp(LOGOF2/256.*(Le+.5) - LOGOF2*64.);
628 if (p16 & 0x8000)
629 return (-Y);
630 return (Y);
631 }
632
633 static int
634 pix16fromY(double Y)
635 {
636 if (Y >= 1.84467e19)
637 return (0x7fff);
638 if (Y <= -1.84467e19)
639 return (0xffff);
640 if (Y > 5.43571e-20)
641 return (int)(256.*(log2(Y) + 64.));
642 if (Y < -5.43571e-20)
643 return (~0x7fff | (int)(256.*(log2(-Y) + 64.)));
644 return (0);
645 }
646
647 static void
648 L16toY(LogLuvState* sp, tidata_t op, int n)
649 {
650 int16* l16 = (int16*) sp->tbuf;
651 float* yp = (float*) op;
652
653 while (n-- > 0)
654 *yp++ = pix16toY(*l16++);
655 }
656
657 static void
658 L16toGry(LogLuvState* sp, tidata_t op, int n)
659 {
660 int16* l16 = (int16*) sp->tbuf;
661 uint8* gp = (uint8*) op;
662
663 while (n-- > 0) {
664 double Y = pix16toY(*l16++);
665 *gp++ = (Y <= 0.) ? 0 : (Y >= 1.) ? 255 : (int)(256.*sqrt(Y));
666 }
667 }
668
669 static void
670 L16fromY(LogLuvState* sp, tidata_t op, int n)
671 {
672 int16* l16 = (int16*) sp->tbuf;
673 float* yp = (float*) op;
674
675 while (n-- > 0)
676 *l16++ = pix16fromY(*yp++);
677 }
678
679 static void
680 XYZtoRGB24(float xyz[3], uint8 rgb[3])
681 {
682 double r, g, b;
683 /* assume CCIR-709 primaries */
684 r = 2.690*xyz[0] + -1.276*xyz[1] + -0.414*xyz[2];
685 g = -1.022*xyz[0] + 1.978*xyz[1] + 0.044*xyz[2];
686 b = 0.061*xyz[0] + -0.224*xyz[1] + 1.163*xyz[2];
687 /* assume 2.0 gamma for speed */
688 /* could use integer sqrt approx., but this is probably faster */
689 rgb[0] = (r <= 0.) ? 0 : (r >= 1.) ? 255 : (int)(256.*sqrt(r));
690 rgb[1] = (g <= 0.) ? 0 : (g >= 1.) ? 255 : (int)(256.*sqrt(g));
691 rgb[2] = (b <= 0.) ? 0 : (b >= 1.) ? 255 : (int)(256.*sqrt(b));
692 }
693
694 static int
695 uv_encode(double u, double v) /* encode (u',v') coordinates */
696 {
697 register int vi, ui;
698
699 if (v < UV_VSTART)
700 return(-1);
701 vi = (v - UV_VSTART)*(1./UV_SQSIZ);
702 if (vi >= UV_NVS)
703 return(-1);
704 if (u < uv_row[vi].ustart)
705 return(-1);
706 ui = (u - uv_row[vi].ustart)*(1./UV_SQSIZ);
707 if (ui >= uv_row[vi].nus)
708 return(-1);
709 return(uv_row[vi].ncum + ui);
710 }
711
712 static int
713 uv_decode(double *up, double *vp, int c) /* decode (u',v') index */
714 {
715 int upper, lower;
716 register int ui, vi;
717
718 if (c < 0 || c >= UV_NDIVS)
719 return(-1);
720 lower = 0; /* binary search */
721 upper = UV_NVS;
722 do {
723 vi = (lower + upper) >> 1;
724 ui = c - uv_row[vi].ncum;
725 if (ui > 0)
726 lower = vi;
727 else if (ui < 0)
728 upper = vi;
729 else
730 break;
731 } while (upper - lower > 1);
732 vi = lower;
733 ui = c - uv_row[vi].ncum;
734 *up = uv_row[vi].ustart + (ui+.5)*UV_SQSIZ;
735 *vp = UV_VSTART + (vi+.5)*UV_SQSIZ;
736 return(0);
737 }
738
739 static void
740 pix24toXYZ(uint32 p, float XYZ[3])
741 {
742 int Le, Ce;
743 double L, u, v, s, x, y;
744 /* decode luminance */
745 Le = p >> 14 & 0x3ff;
746 if (Le == 0) {
747 XYZ[0] = XYZ[1] = XYZ[2] = 0.;
748 return;
749 }
750 L = exp(LOGOF2/64.*(Le+.5) - LOGOF2*12.);
751 /* decode color */
752 Ce = p & 0x3fff;
753 if (uv_decode(&u, &v, Ce) < 0) {
754 u = U_NEU; v = V_NEU;
755 }
756 s = 1./(6.*u - 16.*v + 12.);
757 x = 9.*u * s;
758 y = 4.*v * s;
759 /* convert to XYZ */
760 XYZ[0] = x/y * L;
761 XYZ[1] = L;
762 XYZ[2] = (1.-x-y)/y * L;
763 }
764
765 static uint32
766 pix24fromXYZ(float XYZ[3])
767 {
768 int Le, Ce;
769 double L, u, v, s;
770 /* encode luminance */
771 L = XYZ[1];
772 if (L >= 16.)
773 Le = 0x3ff;
774 else if (L <= 1./4096.)
775 Le = 0;
776 else
777 Le = 64.*(log2(L) + 12.);
778 /* encode color */
779 s = XYZ[0] + 15.*XYZ[1] + 3.*XYZ[2];
780 if (s == 0.) {
781 u = U_NEU;
782 v = V_NEU;
783 } else {
784 u = 4.*XYZ[0] / s;
785 v = 9.*XYZ[1] / s;
786 }
787 Ce = uv_encode(u, v);
788 if (Ce < 0)
789 Ce = uv_encode(U_NEU, V_NEU);
790 /* combine encodings */
791 return (Le << 14 | Ce);
792 }
793
794 static void
795 Luv24toXYZ(LogLuvState* sp, tidata_t op, int n)
796 {
797 uint32* luv = (uint32*) sp->tbuf;
798 float* xyz = (float*) op;
799
800 while (n-- > 0) {
801 pix24toXYZ(*luv, xyz);
802 xyz += 3;
803 luv++;
804 }
805 }
806
807 static void
808 Luv24toLuv48(LogLuvState* sp, tidata_t op, int n)
809 {
810 uint32* luv = (uint32*) sp->tbuf;
811 int16* luv3 = (int16*) op;
812
813 while (n-- > 0) {
814 double u, v;
815
816 *luv3++ = (*luv >> 12 & 0xffd) + 13314;
817 if (uv_decode(&u, &v, *luv&0x3fff) < 0) {
818 u = U_NEU;
819 v = V_NEU;
820 }
821 *luv3++ = u * (1L<<15);
822 *luv3++ = v * (1L<<15);
823 luv++;
824 }
825 }
826
827 static void
828 Luv24toRGB(LogLuvState* sp, tidata_t op, int n)
829 {
830 uint32* luv = (uint32*) sp->tbuf;
831 uint8* rgb = (uint8*) op;
832
833 while (n-- > 0) {
834 float xyz[3];
835
836 pix24toXYZ(*luv++, xyz);
837 XYZtoRGB24(xyz, rgb);
838 rgb += 3;
839 }
840 }
841
842 static void
843 Luv24fromXYZ(LogLuvState* sp, tidata_t op, int n)
844 {
845 uint32* luv = (uint32*) sp->tbuf;
846 float* xyz = (float*) op;
847
848 while (n-- > 0) {
849 *luv++ = pix24fromXYZ(xyz);
850 xyz += 3;
851 }
852 }
853
854 static void
855 Luv24fromLuv48(LogLuvState* sp, tidata_t op, int n)
856 {
857 uint32* luv = (uint32*) sp->tbuf;
858 int16* luv3 = (int16*) op;
859
860 while (n-- > 0) {
861 int Le, Ce;
862
863 if (luv3[0] <= 0)
864 Le = 0;
865 else if (luv3[0] >= (1<<12)+3314)
866 Le = (1<<10) - 1;
867 else
868 Le = (luv3[0]-3314) >> 2;
869 Ce = uv_encode((luv[1]+.5)/(1<<15), (luv[2]+.5)/(1<<15));
870 if (Ce < 0)
871 Ce = uv_encode(U_NEU, V_NEU);
872 *luv++ = (uint32)Le << 14 | Ce;
873 luv3 += 3;
874 }
875 }
876
877 static void
878 pix32toXYZ(uint32 p, float XYZ[3])
879 {
880 double L, u, v, s, x, y;
881 /* decode luminance */
882 L = pix16toY((int)p >> 16);
883 if (L == 0.) {
884 XYZ[0] = XYZ[1] = XYZ[2] = 0.;
885 return;
886 }
887 /* decode color */
888 u = 1./UVSCALE * ((p>>8 & 0xff) + .5);
889 v = 1./UVSCALE * ((p & 0xff) + .5);
890 s = 1./(6.*u - 16.*v + 12.);
891 x = 9.*u * s;
892 y = 4.*v * s;
893 /* convert to XYZ */
894 XYZ[0] = x/y * L;
895 XYZ[1] = L;
896 XYZ[2] = (1.-x-y)/y * L;
897 }
898
899 static uint32
900 pix32fromXYZ(float XYZ[3])
901 {
902 unsigned int Le, ue, ve;
903 double u, v, s;
904 /* encode luminance */
905 Le = (unsigned int)pix16fromY(XYZ[1]);
906 /* encode color */
907 s = XYZ[0] + 15.*XYZ[1] + 3.*XYZ[2];
908 if (s == 0.) {
909 u = U_NEU;
910 v = V_NEU;
911 } else {
912 u = 4.*XYZ[0] / s;
913 v = 9.*XYZ[1] / s;
914 }
915 if (u <= 0.) ue = 0;
916 else ue = UVSCALE * u;
917 if (ue > 255) ue = 255;
918 if (v <= 0.) ve = 0;
919 else ve = UVSCALE * v;
920 if (ve > 255) ve = 255;
921 /* combine encodings */
922 return (Le << 16 | ue << 8 | ve);
923 }
924
925 static void
926 Luv32toXYZ(LogLuvState* sp, tidata_t op, int n)
927 {
928 uint32* luv = (uint32*) sp->tbuf;
929 float* xyz = (float*) op;
930
931 while (n-- > 0) {
932 pix32toXYZ(*luv++, xyz);
933 xyz += 3;
934 }
935 }
936
937 static void
938 Luv32toLuv48(LogLuvState* sp, tidata_t op, int n)
939 {
940 uint32* luv = (uint32*) sp->tbuf;
941 int16* luv3 = (int16*) op;
942
943 while (n-- > 0) {
944 double u, v;
945
946 *luv3++ = *luv >> 16;
947 u = 1./UVSCALE * ((*luv>>8 & 0xff) + .5);
948 v = 1./UVSCALE * ((*luv & 0xff) + .5);
949 *luv3++ = u * (1L<<15);
950 *luv3++ = v * (1L<<15);
951 luv++;
952 }
953 }
954
955 static void
956 Luv32toRGB(LogLuvState* sp, tidata_t op, int n)
957 {
958 uint32* luv = (uint32*) sp->tbuf;
959 uint8* rgb = (uint8*) op;
960
961 while (n-- > 0) {
962 float xyz[3];
963
964 pix32toXYZ(*luv++, xyz);
965 XYZtoRGB24(xyz, rgb);
966 rgb += 3;
967 }
968 }
969
970 static void
971 Luv32fromXYZ(LogLuvState* sp, tidata_t op, int n)
972 {
973 uint32* luv = (uint32*) sp->tbuf;
974 float* xyz = (float*) op;
975
976 while (n-- > 0) {
977 *luv++ = pix32fromXYZ(xyz);
978 xyz += 3;
979 }
980 }
981
982 static void
983 Luv32fromLuv48(LogLuvState* sp, tidata_t op, int n)
984 {
985 uint32* luv = (uint32*) sp->tbuf;
986 int16* luv3 = (int16*) op;
987
988 while (n-- > 0) {
989 *luv++ = (uint32)luv3[0] << 16 |
990 (luv3[1]*(uint32)(UVSCALE+.5) >> 7 & 0xff00) |
991 (luv3[2]*(uint32)(UVSCALE+.5) >> 15 & 0xff);
992 luv3 += 3;
993 }
994 }
995
996 static void
997 _logLuvNop(LogLuvState* sp, tidata_t op, int n)
998 {
999 (void) sp; (void) op; (void) n;
1000 }
1001
1002 static int
1003 LogL16GuessDataFmt(TIFFDirectory *td)
1004 {
1005 #define PACK(s,b,f) (((b)<<6)|((s)<<3)|(f))
1006 switch (PACK(td->td_samplesperpixel, td->td_bitspersample, td->td_sampleformat)) {
1007 case PACK(1, 32, SAMPLEFORMAT_IEEEFP):
1008 return (SGILOGDATAFMT_FLOAT);
1009 case PACK(1, 16, SAMPLEFORMAT_VOID):
1010 case PACK(1, 16, SAMPLEFORMAT_INT):
1011 case PACK(1, 16, SAMPLEFORMAT_UINT):
1012 return (SGILOGDATAFMT_16BIT);
1013 case PACK(1, 8, SAMPLEFORMAT_VOID):
1014 case PACK(1, 8, SAMPLEFORMAT_UINT):
1015 return (SGILOGDATAFMT_8BIT);
1016 }
1017 #undef PACK
1018 return (SGILOGDATAFMT_UNKNOWN);
1019 }
1020
1021 static int
1022 LogL16InitState(TIFF* tif)
1023 {
1024 TIFFDirectory *td = &tif->tif_dir;
1025 LogLuvState* sp = DecoderState(tif);
1026 static const char module[] = "LogL16InitState";
1027
1028 assert(sp != NULL);
1029 assert(td->td_photometric == PHOTOMETRIC_LOGL);
1030
1031 /* for some reason, we can't do this in TIFFInitLogL16 */
1032 if (sp->user_datafmt == SGILOGDATAFMT_UNKNOWN)
1033 sp->user_datafmt = LogL16GuessDataFmt(td);
1034 switch (sp->user_datafmt) {
1035 case SGILOGDATAFMT_FLOAT:
1036 sp->pixel_size = sizeof (float);
1037 break;
1038 case SGILOGDATAFMT_16BIT:
1039 sp->pixel_size = sizeof (int16);
1040 break;
1041 case SGILOGDATAFMT_8BIT:
1042 sp->pixel_size = sizeof (uint8);
1043 break;
1044 default:
1045 TIFFError(tif->tif_name,
1046 "No support for converting user data format to LogL");
1047 return (0);
1048 }
1049 sp->tbuflen = td->td_imagewidth * td->td_rowsperstrip;
1050 sp->tbuf = (tidata_t*) _TIFFmalloc(sp->tbuflen * sizeof (int16));
1051 if (sp->tbuf == NULL) {
1052 TIFFError(module, "%s: No space for SGILog translation buffer",
1053 tif->tif_name);
1054 return (0);
1055 }
1056 return (1);
1057 }
1058
1059 static int
1060 LogLuvGuessDataFmt(TIFFDirectory *td)
1061 {
1062 int guess;
1063
1064 /*
1065 * If the user didn't tell us their datafmt,
1066 * take our best guess from the bitspersample.
1067 */
1068 #define PACK(a,b) (((a)<<3)|(b))
1069 switch (PACK(td->td_bitspersample, td->td_sampleformat)) {
1070 case PACK(32, SAMPLEFORMAT_IEEEFP):
1071 guess = SGILOGDATAFMT_FLOAT;
1072 break;
1073 case PACK(32, SAMPLEFORMAT_VOID):
1074 case PACK(32, SAMPLEFORMAT_UINT):
1075 case PACK(32, SAMPLEFORMAT_INT):
1076 guess = SGILOGDATAFMT_RAW;
1077 break;
1078 case PACK(16, SAMPLEFORMAT_VOID):
1079 case PACK(16, SAMPLEFORMAT_INT):
1080 case PACK(16, SAMPLEFORMAT_UINT):
1081 guess = SGILOGDATAFMT_16BIT;
1082 break;
1083 case PACK( 8, SAMPLEFORMAT_VOID):
1084 case PACK( 8, SAMPLEFORMAT_UINT):
1085 guess = SGILOGDATAFMT_8BIT;
1086 break;
1087 default:
1088 guess = SGILOGDATAFMT_UNKNOWN;
1089 break;
1090 #undef PACK
1091 }
1092 /*
1093 * Double-check samples per pixel.
1094 */
1095 switch (td->td_samplesperpixel) {
1096 case 1:
1097 if (guess != SGILOGDATAFMT_RAW)
1098 guess = SGILOGDATAFMT_UNKNOWN;
1099 break;
1100 case 3:
1101 if (guess == SGILOGDATAFMT_RAW)
1102 guess = SGILOGDATAFMT_UNKNOWN;
1103 break;
1104 default:
1105 guess = SGILOGDATAFMT_UNKNOWN;
1106 break;
1107 }
1108 return (guess);
1109 }
1110
1111 static int
1112 LogLuvInitState(TIFF* tif)
1113 {
1114 TIFFDirectory* td = &tif->tif_dir;
1115 LogLuvState* sp = DecoderState(tif);
1116 static const char module[] = "LogLuvInitState";
1117
1118 assert(sp != NULL);
1119 assert(td->td_photometric == PHOTOMETRIC_LOGLUV);
1120
1121 /* for some reason, we can't do this in TIFFInitLogLuv */
1122 if (td->td_planarconfig != PLANARCONFIG_CONTIG) {
1123 TIFFError(module,
1124 "SGILog compression cannot handle non-contiguous data");
1125 return (0);
1126 }
1127 if (sp->user_datafmt == SGILOGDATAFMT_UNKNOWN)
1128 sp->user_datafmt = LogLuvGuessDataFmt(td);
1129 switch (sp->user_datafmt) {
1130 case SGILOGDATAFMT_FLOAT:
1131 sp->pixel_size = 3*sizeof (float);
1132 break;
1133 case SGILOGDATAFMT_16BIT:
1134 sp->pixel_size = 3*sizeof (int16);
1135 break;
1136 case SGILOGDATAFMT_RAW:
1137 sp->pixel_size = sizeof (uint32);
1138 break;
1139 case SGILOGDATAFMT_8BIT:
1140 sp->pixel_size = 3*sizeof (uint8);
1141 break;
1142 default:
1143 TIFFError(tif->tif_name,
1144 "No support for converting user data format to LogLuv");
1145 return (0);
1146 }
1147 sp->tbuflen = td->td_imagewidth * td->td_rowsperstrip;
1148 sp->tbuf = (tidata_t*) _TIFFmalloc(sp->tbuflen * sizeof (uint32));
1149 if (sp->tbuf == NULL) {
1150 TIFFError(module, "%s: No space for SGILog translation buffer",
1151 tif->tif_name);
1152 return (0);
1153 }
1154 return (1);
1155 }
1156
1157 static int
1158 LogLuvSetupDecode(TIFF* tif)
1159 {
1160 LogLuvState* sp = DecoderState(tif);
1161 TIFFDirectory* td = &tif->tif_dir;
1162
1163 tif->tif_postdecode = _TIFFNoPostDecode;
1164 switch (td->td_photometric) {
1165 case PHOTOMETRIC_LOGLUV:
1166 if (!LogLuvInitState(tif))
1167 break;
1168 if (td->td_compression == COMPRESSION_SGILOG24) {
1169 tif->tif_decoderow = LogLuvDecode24;
1170 switch (sp->user_datafmt) {
1171 case SGILOGDATAFMT_FLOAT:
1172 sp->tfunc = Luv24toXYZ;
1173 break;
1174 case SGILOGDATAFMT_16BIT:
1175 sp->tfunc = Luv24toLuv48;
1176 break;
1177 case SGILOGDATAFMT_8BIT:
1178 sp->tfunc = Luv24toRGB;
1179 break;
1180 }
1181 } else {
1182 tif->tif_decoderow = LogLuvDecode32;
1183 switch (sp->user_datafmt) {
1184 case SGILOGDATAFMT_FLOAT:
1185 sp->tfunc = Luv32toXYZ;
1186 break;
1187 case SGILOGDATAFMT_16BIT:
1188 sp->tfunc = Luv32toLuv48;
1189 break;
1190 case SGILOGDATAFMT_8BIT:
1191 sp->tfunc = Luv32toRGB;
1192 break;
1193 }
1194 }
1195 return (1);
1196 case PHOTOMETRIC_LOGL:
1197 if (!LogL16InitState(tif))
1198 break;
1199 tif->tif_decoderow = LogL16Decode;
1200 switch (sp->user_datafmt) {
1201 case SGILOGDATAFMT_FLOAT:
1202 sp->tfunc = L16toY;
1203 break;
1204 case SGILOGDATAFMT_8BIT:
1205 sp->tfunc = L16toGry;
1206 break;
1207 }
1208 return (1);
1209 default:
1210 TIFFError(tif->tif_name,
1211 "Inappropriate photometric interpretation %d for SGILog compression; %s",
1212 td->td_photometric, "must be either LogLUV or LogL");
1213 break;
1214 }
1215 return (0);
1216 }
1217
1218 static int
1219 LogLuvSetupEncode(TIFF* tif)
1220 {
1221 LogLuvState* sp = EncoderState(tif);
1222 TIFFDirectory* td = &tif->tif_dir;
1223
1224 switch (td->td_photometric) {
1225 case PHOTOMETRIC_LOGLUV:
1226 if (!LogLuvInitState(tif))
1227 break;
1228 if (td->td_compression == COMPRESSION_SGILOG24) {
1229 tif->tif_encoderow = LogLuvEncode24;
1230 switch (sp->user_datafmt) {
1231 case SGILOGDATAFMT_FLOAT:
1232 sp->tfunc = Luv24fromXYZ;
1233 break;
1234 case SGILOGDATAFMT_16BIT:
1235 sp->tfunc = Luv24fromLuv48;
1236 break;
1237 case SGILOGDATAFMT_RAW:
1238 break;
1239 default:
1240 goto notsupported;
1241 }
1242 } else {
1243 tif->tif_encoderow = LogLuvEncode32;
1244 switch (sp->user_datafmt) {
1245 case SGILOGDATAFMT_FLOAT:
1246 sp->tfunc = Luv32fromXYZ;
1247 break;
1248 case SGILOGDATAFMT_16BIT:
1249 sp->tfunc = Luv32fromLuv48;
1250 break;
1251 case SGILOGDATAFMT_RAW:
1252 break;
1253 default:
1254 goto notsupported;
1255 }
1256 }
1257 break;
1258 case PHOTOMETRIC_LOGL:
1259 if (!LogL16InitState(tif))
1260 break;
1261 tif->tif_encoderow = LogL16Encode;
1262 switch (sp->user_datafmt) {
1263 case SGILOGDATAFMT_FLOAT:
1264 sp->tfunc = L16fromY;
1265 break;
1266 case SGILOGDATAFMT_16BIT:
1267 break;
1268 default:
1269 goto notsupported;
1270 }
1271 break;
1272 default:
1273 TIFFError(tif->tif_name,
1274 "Inappropriate photometric interpretation %d for SGILog compression; %s",
1275 td->td_photometric, "must be either LogLUV or LogL");
1276 break;
1277 }
1278 return (1);
1279 notsupported:
1280 TIFFError(tif->tif_name,
1281 "SGILog compression supported only for %s, or raw data",
1282 td->td_photometric == PHOTOMETRIC_LOGL ? "Y, L" : "XYZ, Luv");
1283 return (0);
1284 }
1285
1286 static void
1287 LogLuvClose(TIFF* tif)
1288 {
1289 TIFFDirectory *td = &tif->tif_dir;
1290
1291 /*
1292 * For consistency, we always want to write out the same
1293 * bitspersample and sampleformat for our TIFF file,
1294 * regardless of the data format being used by the application.
1295 * Since this routine is called after tags have been set but
1296 * before they have been recorded in the file, we reset them here.
1297 */
1298 td->td_samplesperpixel =
1299 (td->td_photometric == PHOTOMETRIC_LOGL) ? 1 : 3;
1300 td->td_bitspersample = 16;
1301 td->td_sampleformat = SAMPLEFORMAT_INT;
1302 }
1303
1304 static void
1305 LogLuvCleanup(TIFF* tif)
1306 {
1307 LogLuvState* sp = (LogLuvState *)tif->tif_data;
1308
1309 if (sp) {
1310 if (sp->tbuf)
1311 _TIFFfree(sp->tbuf);
1312 _TIFFfree(sp);
1313 tif->tif_data = NULL;
1314 }
1315 }
1316
1317 static int
1318 LogLuvVSetField(TIFF* tif, ttag_t tag, va_list ap)
1319 {
1320 LogLuvState* sp = DecoderState(tif);
1321 int bps, fmt;
1322
1323 switch (tag) {
1324 case TIFFTAG_SGILOGDATAFMT:
1325 sp->user_datafmt = va_arg(ap, int);
1326 /*
1327 * Tweak the TIFF header so that the rest of libtiff knows what
1328 * size of data will be passed between app and library, and
1329 * assume that the app knows what it is doing and is not
1330 * confused by these header manipulations...
1331 */
1332 switch (sp->user_datafmt) {
1333 case SGILOGDATAFMT_FLOAT:
1334 bps = 32, fmt = SAMPLEFORMAT_IEEEFP;
1335 break;
1336 case SGILOGDATAFMT_16BIT:
1337 bps = 16, fmt = SAMPLEFORMAT_INT;
1338 break;
1339 case SGILOGDATAFMT_RAW:
1340 bps = 32, fmt = SAMPLEFORMAT_UINT;
1341 break;
1342 case SGILOGDATAFMT_8BIT:
1343 bps = 8, fmt = SAMPLEFORMAT_UINT;
1344 break;
1345 default:
1346 TIFFError(tif->tif_name,
1347 "Unknown data format %d for LogLuv compression",
1348 sp->user_datafmt);
1349 return (0);
1350 }
1351 TIFFSetField(tif, TIFFTAG_BITSPERSAMPLE, bps);
1352 TIFFSetField(tif, TIFFTAG_SAMPLEFORMAT, fmt);
1353 /*
1354 * Must recalculate sizes should bits/sample change.
1355 */
1356 tif->tif_tilesize = TIFFTileSize(tif);
1357 tif->tif_scanlinesize = TIFFScanlineSize(tif);
1358 return (1);
1359 default:
1360 return (*sp->vsetparent)(tif, tag, ap);
1361 }
1362 }
1363
1364 static int
1365 LogLuvVGetField(TIFF* tif, ttag_t tag, va_list ap)
1366 {
1367 LogLuvState *sp = (LogLuvState *)tif->tif_data;
1368
1369 switch (tag) {
1370 case TIFFTAG_SGILOGDATAFMT:
1371 *va_arg(ap, int*) = sp->user_datafmt;
1372 return (1);
1373 default:
1374 return (*sp->vgetparent)(tif, tag, ap);
1375 }
1376 }
1377
1378 static const TIFFFieldInfo LogLuvFieldInfo[] = {
1379 { TIFFTAG_SGILOGDATAFMT, 0, 0, TIFF_SHORT, FIELD_PSEUDO,
1380 TRUE, FALSE, "SGILogDataFmt"}
1381 };
1382
1383 int
1384 TIFFInitSGILog(TIFF* tif, int scheme)
1385 {
1386 static const char module[] = "TIFFInitSGILog";
1387 LogLuvState* sp;
1388
1389 assert(scheme == COMPRESSION_SGILOG24 || scheme == COMPRESSION_SGILOG);
1390
1391 /*
1392 * Allocate state block so tag methods have storage to record values.
1393 */
1394 tif->tif_data = (tidata_t) _TIFFmalloc(sizeof (LogLuvState));
1395 if (tif->tif_data == NULL)
1396 goto bad;
1397 sp = (LogLuvState*) tif->tif_data;
1398 memset(sp, 0, sizeof (*sp));
1399 sp->user_datafmt = SGILOGDATAFMT_UNKNOWN;
1400 sp->tfunc = _logLuvNop;
1401
1402 /*
1403 * Install codec methods.
1404 * NB: tif_decoderow & tif_encoderow are filled
1405 * in at setup time.
1406 */
1407 tif->tif_setupdecode = LogLuvSetupDecode;
1408 tif->tif_decodestrip = LogLuvDecodeStrip;
1409 tif->tif_decodetile = LogLuvDecodeTile;
1410 tif->tif_setupencode = LogLuvSetupEncode;
1411 tif->tif_encodestrip = LogLuvEncodeStrip;
1412 tif->tif_encodetile = LogLuvEncodeTile;
1413 tif->tif_close = LogLuvClose;
1414 tif->tif_cleanup = LogLuvCleanup;
1415
1416 /* override SetField so we can handle our private pseudo-tag */
1417 _TIFFMergeFieldInfo(tif, LogLuvFieldInfo, N(LogLuvFieldInfo));
1418 sp->vgetparent = tif->tif_vgetfield;
1419 tif->tif_vgetfield = LogLuvVGetField; /* hook for codec tags */
1420 sp->vsetparent = tif->tif_vsetfield;
1421 tif->tif_vsetfield = LogLuvVSetField; /* hook for codec tags */
1422
1423 return (1);
1424 bad:
1425 TIFFError(module, "%s: No space for LogLuv state block", tif->tif_name);
1426 return (0);
1427 }
1428 #endif /* LOGLUV_SUPPORT */
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