[LIBTIFF]
[reactos.git] / reactos / dll / 3rdparty / libtiff / tif_luv.c
1 /* $Id: tif_luv.c,v 1.47 2017-05-14 10:17:27 erouault Exp $ */
2
3 /*
4 * Copyright (c) 1997 Greg Ward Larson
5 * Copyright (c) 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, Greg Larson and Silicon Graphics may not be used in any
12 * advertising or publicity relating to the software without the specific,
13 * prior written permission of Sam Leffler, Greg Larson 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, GREG LARSON OR SILICON GRAPHICS BE LIABLE
20 * FOR 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 #include <precomp.h>
28
29 #ifdef LOGLUV_SUPPORT
30
31 /*
32 * TIFF Library.
33 * LogLuv compression support for high dynamic range images.
34 *
35 * Contributed by Greg Larson.
36 *
37 * LogLuv image support uses the TIFF library to store 16 or 10-bit
38 * log luminance values with 8 bits each of u and v or a 14-bit index.
39 *
40 * The codec can take as input and produce as output 32-bit IEEE float values
41 * as well as 16-bit integer values. A 16-bit luminance is interpreted
42 * as a sign bit followed by a 15-bit integer that is converted
43 * to and from a linear magnitude using the transformation:
44 *
45 * L = 2^( (Le+.5)/256 - 64 ) # real from 15-bit
46 *
47 * Le = floor( 256*(log2(L) + 64) ) # 15-bit from real
48 *
49 * The actual conversion to world luminance units in candelas per sq. meter
50 * requires an additional multiplier, which is stored in the TIFFTAG_STONITS.
51 * This value is usually set such that a reasonable exposure comes from
52 * clamping decoded luminances above 1 to 1 in the displayed image.
53 *
54 * The 16-bit values for u and v may be converted to real values by dividing
55 * each by 32768. (This allows for negative values, which aren't useful as
56 * far as we know, but are left in case of future improvements in human
57 * color vision.)
58 *
59 * Conversion from (u,v), which is actually the CIE (u',v') system for
60 * you color scientists, is accomplished by the following transformation:
61 *
62 * u = 4*x / (-2*x + 12*y + 3)
63 * v = 9*y / (-2*x + 12*y + 3)
64 *
65 * x = 9*u / (6*u - 16*v + 12)
66 * y = 4*v / (6*u - 16*v + 12)
67 *
68 * This process is greatly simplified by passing 32-bit IEEE floats
69 * for each of three CIE XYZ coordinates. The codec then takes care
70 * of conversion to and from LogLuv, though the application is still
71 * responsible for interpreting the TIFFTAG_STONITS calibration factor.
72 *
73 * By definition, a CIE XYZ vector of [1 1 1] corresponds to a neutral white
74 * point of (x,y)=(1/3,1/3). However, most color systems assume some other
75 * white point, such as D65, and an absolute color conversion to XYZ then
76 * to another color space with a different white point may introduce an
77 * unwanted color cast to the image. It is often desirable, therefore, to
78 * perform a white point conversion that maps the input white to [1 1 1]
79 * in XYZ, then record the original white point using the TIFFTAG_WHITEPOINT
80 * tag value. A decoder that demands absolute color calibration may use
81 * this white point tag to get back the original colors, but usually it
82 * will be ignored and the new white point will be used instead that
83 * matches the output color space.
84 *
85 * Pixel information is compressed into one of two basic encodings, depending
86 * on the setting of the compression tag, which is one of COMPRESSION_SGILOG
87 * or COMPRESSION_SGILOG24. For COMPRESSION_SGILOG, greyscale data is
88 * stored as:
89 *
90 * 1 15
91 * |-+---------------|
92 *
93 * COMPRESSION_SGILOG color data is stored as:
94 *
95 * 1 15 8 8
96 * |-+---------------|--------+--------|
97 * S Le ue ve
98 *
99 * For the 24-bit COMPRESSION_SGILOG24 color format, the data is stored as:
100 *
101 * 10 14
102 * |----------|--------------|
103 * Le' Ce
104 *
105 * There is no sign bit in the 24-bit case, and the (u,v) chromaticity is
106 * encoded as an index for optimal color resolution. The 10 log bits are
107 * defined by the following conversions:
108 *
109 * L = 2^((Le'+.5)/64 - 12) # real from 10-bit
110 *
111 * Le' = floor( 64*(log2(L) + 12) ) # 10-bit from real
112 *
113 * The 10 bits of the smaller format may be converted into the 15 bits of
114 * the larger format by multiplying by 4 and adding 13314. Obviously,
115 * a smaller range of magnitudes is covered (about 5 orders of magnitude
116 * instead of 38), and the lack of a sign bit means that negative luminances
117 * are not allowed. (Well, they aren't allowed in the real world, either,
118 * but they are useful for certain types of image processing.)
119 *
120 * The desired user format is controlled by the setting the internal
121 * pseudo tag TIFFTAG_SGILOGDATAFMT to one of:
122 * SGILOGDATAFMT_FLOAT = IEEE 32-bit float XYZ values
123 * SGILOGDATAFMT_16BIT = 16-bit integer encodings of logL, u and v
124 * Raw data i/o is also possible using:
125 * SGILOGDATAFMT_RAW = 32-bit unsigned integer with encoded pixel
126 * In addition, the following decoding is provided for ease of display:
127 * SGILOGDATAFMT_8BIT = 8-bit default RGB gamma-corrected values
128 *
129 * For grayscale images, we provide the following data formats:
130 * SGILOGDATAFMT_FLOAT = IEEE 32-bit float Y values
131 * SGILOGDATAFMT_16BIT = 16-bit integer w/ encoded luminance
132 * SGILOGDATAFMT_8BIT = 8-bit gray monitor values
133 *
134 * Note that the COMPRESSION_SGILOG applies a simple run-length encoding
135 * scheme by separating the logL, u and v bytes for each row and applying
136 * a PackBits type of compression. Since the 24-bit encoding is not
137 * adaptive, the 32-bit color format takes less space in many cases.
138 *
139 * Further control is provided over the conversion from higher-resolution
140 * formats to final encoded values through the pseudo tag
141 * TIFFTAG_SGILOGENCODE:
142 * SGILOGENCODE_NODITHER = do not dither encoded values
143 * SGILOGENCODE_RANDITHER = apply random dithering during encoding
144 *
145 * The default value of this tag is SGILOGENCODE_NODITHER for
146 * COMPRESSION_SGILOG to maximize run-length encoding and
147 * SGILOGENCODE_RANDITHER for COMPRESSION_SGILOG24 to turn
148 * quantization errors into noise.
149 */
150
151 #include <stdio.h>
152 #include <stdlib.h>
153 #include <math.h>
154
155 /*
156 * State block for each open TIFF
157 * file using LogLuv compression/decompression.
158 */
159 typedef struct logLuvState LogLuvState;
160
161 struct logLuvState {
162 int encoder_state; /* 1 if encoder correctly initialized */
163 int user_datafmt; /* user data format */
164 int encode_meth; /* encoding method */
165 int pixel_size; /* bytes per pixel */
166
167 uint8* tbuf; /* translation buffer */
168 tmsize_t tbuflen; /* buffer length */
169 void (*tfunc)(LogLuvState*, uint8*, tmsize_t);
170
171 TIFFVSetMethod vgetparent; /* super-class method */
172 TIFFVSetMethod vsetparent; /* super-class method */
173 };
174
175 #define DecoderState(tif) ((LogLuvState*) (tif)->tif_data)
176 #define EncoderState(tif) ((LogLuvState*) (tif)->tif_data)
177
178 #define SGILOGDATAFMT_UNKNOWN -1
179
180 #define MINRUN 4 /* minimum run length */
181
182 /*
183 * Decode a string of 16-bit gray pixels.
184 */
185 static int
186 LogL16Decode(TIFF* tif, uint8* op, tmsize_t occ, uint16 s)
187 {
188 static const char module[] = "LogL16Decode";
189 LogLuvState* sp = DecoderState(tif);
190 int shft;
191 tmsize_t i;
192 tmsize_t npixels;
193 unsigned char* bp;
194 int16* tp;
195 int16 b;
196 tmsize_t cc;
197 int rc;
198
199 assert(s == 0);
200 assert(sp != NULL);
201
202 npixels = occ / sp->pixel_size;
203
204 if (sp->user_datafmt == SGILOGDATAFMT_16BIT)
205 tp = (int16*) op;
206 else {
207 if(sp->tbuflen < npixels) {
208 TIFFErrorExt(tif->tif_clientdata, module,
209 "Translation buffer too short");
210 return (0);
211 }
212 tp = (int16*) sp->tbuf;
213 }
214 _TIFFmemset((void*) tp, 0, npixels*sizeof (tp[0]));
215
216 bp = (unsigned char*) tif->tif_rawcp;
217 cc = tif->tif_rawcc;
218 /* get each byte string */
219 for (shft = 2*8; (shft -= 8) >= 0; ) {
220 for (i = 0; i < npixels && cc > 0; ) {
221 if (*bp >= 128) { /* run */
222 if( cc < 2 )
223 break;
224 rc = *bp++ + (2-128);
225 b = (int16)(*bp++ << shft);
226 cc -= 2;
227 while (rc-- && i < npixels)
228 tp[i++] |= b;
229 } else { /* non-run */
230 rc = *bp++; /* nul is noop */
231 while (--cc && rc-- && i < npixels)
232 tp[i++] |= (int16)*bp++ << shft;
233 }
234 }
235 if (i != npixels) {
236 #if defined(__WIN32__) && (defined(_MSC_VER) || defined(__MINGW32__))
237 TIFFErrorExt(tif->tif_clientdata, module,
238 "Not enough data at row %lu (short %I64d pixels)",
239 (unsigned long) tif->tif_row,
240 (unsigned __int64) (npixels - i));
241 #else
242 TIFFErrorExt(tif->tif_clientdata, module,
243 "Not enough data at row %lu (short %llu pixels)",
244 (unsigned long) tif->tif_row,
245 (unsigned long long) (npixels - i));
246 #endif
247 tif->tif_rawcp = (uint8*) bp;
248 tif->tif_rawcc = cc;
249 return (0);
250 }
251 }
252 (*sp->tfunc)(sp, op, npixels);
253 tif->tif_rawcp = (uint8*) bp;
254 tif->tif_rawcc = cc;
255 return (1);
256 }
257
258 /*
259 * Decode a string of 24-bit pixels.
260 */
261 static int
262 LogLuvDecode24(TIFF* tif, uint8* op, tmsize_t occ, uint16 s)
263 {
264 static const char module[] = "LogLuvDecode24";
265 LogLuvState* sp = DecoderState(tif);
266 tmsize_t cc;
267 tmsize_t i;
268 tmsize_t npixels;
269 unsigned char* bp;
270 uint32* tp;
271
272 assert(s == 0);
273 assert(sp != NULL);
274
275 npixels = occ / sp->pixel_size;
276
277 if (sp->user_datafmt == SGILOGDATAFMT_RAW)
278 tp = (uint32 *)op;
279 else {
280 if(sp->tbuflen < npixels) {
281 TIFFErrorExt(tif->tif_clientdata, module,
282 "Translation buffer too short");
283 return (0);
284 }
285 tp = (uint32 *) sp->tbuf;
286 }
287 /* copy to array of uint32 */
288 bp = (unsigned char*) tif->tif_rawcp;
289 cc = tif->tif_rawcc;
290 for (i = 0; i < npixels && cc >= 3; i++) {
291 tp[i] = bp[0] << 16 | bp[1] << 8 | bp[2];
292 bp += 3;
293 cc -= 3;
294 }
295 tif->tif_rawcp = (uint8*) bp;
296 tif->tif_rawcc = cc;
297 if (i != npixels) {
298 #if defined(__WIN32__) && (defined(_MSC_VER) || defined(__MINGW32__))
299 TIFFErrorExt(tif->tif_clientdata, module,
300 "Not enough data at row %lu (short %I64d pixels)",
301 (unsigned long) tif->tif_row,
302 (unsigned __int64) (npixels - i));
303 #else
304 TIFFErrorExt(tif->tif_clientdata, module,
305 "Not enough data at row %lu (short %llu pixels)",
306 (unsigned long) tif->tif_row,
307 (unsigned long long) (npixels - i));
308 #endif
309 return (0);
310 }
311 (*sp->tfunc)(sp, op, npixels);
312 return (1);
313 }
314
315 /*
316 * Decode a string of 32-bit pixels.
317 */
318 static int
319 LogLuvDecode32(TIFF* tif, uint8* op, tmsize_t occ, uint16 s)
320 {
321 static const char module[] = "LogLuvDecode32";
322 LogLuvState* sp;
323 int shft;
324 tmsize_t i;
325 tmsize_t npixels;
326 unsigned char* bp;
327 uint32* tp;
328 uint32 b;
329 tmsize_t cc;
330 int rc;
331
332 assert(s == 0);
333 sp = DecoderState(tif);
334 assert(sp != NULL);
335
336 npixels = occ / sp->pixel_size;
337
338 if (sp->user_datafmt == SGILOGDATAFMT_RAW)
339 tp = (uint32*) op;
340 else {
341 if(sp->tbuflen < npixels) {
342 TIFFErrorExt(tif->tif_clientdata, module,
343 "Translation buffer too short");
344 return (0);
345 }
346 tp = (uint32*) sp->tbuf;
347 }
348 _TIFFmemset((void*) tp, 0, npixels*sizeof (tp[0]));
349
350 bp = (unsigned char*) tif->tif_rawcp;
351 cc = tif->tif_rawcc;
352 /* get each byte string */
353 for (shft = 4*8; (shft -= 8) >= 0; ) {
354 for (i = 0; i < npixels && cc > 0; ) {
355 if (*bp >= 128) { /* run */
356 if( cc < 2 )
357 break;
358 rc = *bp++ + (2-128);
359 b = (uint32)*bp++ << shft;
360 cc -= 2;
361 while (rc-- && i < npixels)
362 tp[i++] |= b;
363 } else { /* non-run */
364 rc = *bp++; /* nul is noop */
365 while (--cc && rc-- && i < npixels)
366 tp[i++] |= (uint32)*bp++ << shft;
367 }
368 }
369 if (i != npixels) {
370 #if defined(__WIN32__) && (defined(_MSC_VER) || defined(__MINGW32__))
371 TIFFErrorExt(tif->tif_clientdata, module,
372 "Not enough data at row %lu (short %I64d pixels)",
373 (unsigned long) tif->tif_row,
374 (unsigned __int64) (npixels - i));
375 #else
376 TIFFErrorExt(tif->tif_clientdata, module,
377 "Not enough data at row %lu (short %llu pixels)",
378 (unsigned long) tif->tif_row,
379 (unsigned long long) (npixels - i));
380 #endif
381 tif->tif_rawcp = (uint8*) bp;
382 tif->tif_rawcc = cc;
383 return (0);
384 }
385 }
386 (*sp->tfunc)(sp, op, npixels);
387 tif->tif_rawcp = (uint8*) bp;
388 tif->tif_rawcc = cc;
389 return (1);
390 }
391
392 /*
393 * Decode a strip of pixels. We break it into rows to
394 * maintain synchrony with the encode algorithm, which
395 * is row by row.
396 */
397 static int
398 LogLuvDecodeStrip(TIFF* tif, uint8* bp, tmsize_t cc, uint16 s)
399 {
400 tmsize_t rowlen = TIFFScanlineSize(tif);
401
402 if (rowlen == 0)
403 return 0;
404
405 assert(cc%rowlen == 0);
406 while (cc && (*tif->tif_decoderow)(tif, bp, rowlen, s)) {
407 bp += rowlen;
408 cc -= rowlen;
409 }
410 return (cc == 0);
411 }
412
413 /*
414 * Decode a tile of pixels. We break it into rows to
415 * maintain synchrony with the encode algorithm, which
416 * is row by row.
417 */
418 static int
419 LogLuvDecodeTile(TIFF* tif, uint8* bp, tmsize_t cc, uint16 s)
420 {
421 tmsize_t rowlen = TIFFTileRowSize(tif);
422
423 if (rowlen == 0)
424 return 0;
425
426 assert(cc%rowlen == 0);
427 while (cc && (*tif->tif_decoderow)(tif, bp, rowlen, s)) {
428 bp += rowlen;
429 cc -= rowlen;
430 }
431 return (cc == 0);
432 }
433
434 /*
435 * Encode a row of 16-bit pixels.
436 */
437 static int
438 LogL16Encode(TIFF* tif, uint8* bp, tmsize_t cc, uint16 s)
439 {
440 static const char module[] = "LogL16Encode";
441 LogLuvState* sp = EncoderState(tif);
442 int shft;
443 tmsize_t i;
444 tmsize_t j;
445 tmsize_t npixels;
446 uint8* op;
447 int16* tp;
448 int16 b;
449 tmsize_t occ;
450 int rc=0, mask;
451 tmsize_t beg;
452
453 assert(s == 0);
454 assert(sp != NULL);
455 npixels = cc / sp->pixel_size;
456
457 if (sp->user_datafmt == SGILOGDATAFMT_16BIT)
458 tp = (int16*) bp;
459 else {
460 tp = (int16*) sp->tbuf;
461 if(sp->tbuflen < npixels) {
462 TIFFErrorExt(tif->tif_clientdata, module,
463 "Translation buffer too short");
464 return (0);
465 }
466 (*sp->tfunc)(sp, bp, npixels);
467 }
468 /* compress each byte string */
469 op = tif->tif_rawcp;
470 occ = tif->tif_rawdatasize - tif->tif_rawcc;
471 for (shft = 2*8; (shft -= 8) >= 0; )
472 for (i = 0; i < npixels; i += rc) {
473 if (occ < 4) {
474 tif->tif_rawcp = op;
475 tif->tif_rawcc = tif->tif_rawdatasize - occ;
476 if (!TIFFFlushData1(tif))
477 return (0);
478 op = tif->tif_rawcp;
479 occ = tif->tif_rawdatasize - tif->tif_rawcc;
480 }
481 mask = 0xff << shft; /* find next run */
482 for (beg = i; beg < npixels; beg += rc) {
483 b = (int16) (tp[beg] & mask);
484 rc = 1;
485 while (rc < 127+2 && beg+rc < npixels &&
486 (tp[beg+rc] & mask) == b)
487 rc++;
488 if (rc >= MINRUN)
489 break; /* long enough */
490 }
491 if (beg-i > 1 && beg-i < MINRUN) {
492 b = (int16) (tp[i] & mask);/*check short run */
493 j = i+1;
494 while ((tp[j++] & mask) == b)
495 if (j == beg) {
496 *op++ = (uint8)(128-2+j-i);
497 *op++ = (uint8)(b >> shft);
498 occ -= 2;
499 i = beg;
500 break;
501 }
502 }
503 while (i < beg) { /* write out non-run */
504 if ((j = beg-i) > 127) j = 127;
505 if (occ < j+3) {
506 tif->tif_rawcp = op;
507 tif->tif_rawcc = tif->tif_rawdatasize - occ;
508 if (!TIFFFlushData1(tif))
509 return (0);
510 op = tif->tif_rawcp;
511 occ = tif->tif_rawdatasize - tif->tif_rawcc;
512 }
513 *op++ = (uint8) j; occ--;
514 while (j--) {
515 *op++ = (uint8) (tp[i++] >> shft & 0xff);
516 occ--;
517 }
518 }
519 if (rc >= MINRUN) { /* write out run */
520 *op++ = (uint8) (128-2+rc);
521 *op++ = (uint8) (tp[beg] >> shft & 0xff);
522 occ -= 2;
523 } else
524 rc = 0;
525 }
526 tif->tif_rawcp = op;
527 tif->tif_rawcc = tif->tif_rawdatasize - occ;
528
529 return (1);
530 }
531
532 /*
533 * Encode a row of 24-bit pixels.
534 */
535 static int
536 LogLuvEncode24(TIFF* tif, uint8* bp, tmsize_t cc, uint16 s)
537 {
538 static const char module[] = "LogLuvEncode24";
539 LogLuvState* sp = EncoderState(tif);
540 tmsize_t i;
541 tmsize_t npixels;
542 tmsize_t occ;
543 uint8* op;
544 uint32* tp;
545
546 assert(s == 0);
547 assert(sp != NULL);
548 npixels = cc / sp->pixel_size;
549
550 if (sp->user_datafmt == SGILOGDATAFMT_RAW)
551 tp = (uint32*) bp;
552 else {
553 tp = (uint32*) sp->tbuf;
554 if(sp->tbuflen < npixels) {
555 TIFFErrorExt(tif->tif_clientdata, module,
556 "Translation buffer too short");
557 return (0);
558 }
559 (*sp->tfunc)(sp, bp, npixels);
560 }
561 /* write out encoded pixels */
562 op = tif->tif_rawcp;
563 occ = tif->tif_rawdatasize - tif->tif_rawcc;
564 for (i = npixels; i--; ) {
565 if (occ < 3) {
566 tif->tif_rawcp = op;
567 tif->tif_rawcc = tif->tif_rawdatasize - occ;
568 if (!TIFFFlushData1(tif))
569 return (0);
570 op = tif->tif_rawcp;
571 occ = tif->tif_rawdatasize - tif->tif_rawcc;
572 }
573 *op++ = (uint8)(*tp >> 16);
574 *op++ = (uint8)(*tp >> 8 & 0xff);
575 *op++ = (uint8)(*tp++ & 0xff);
576 occ -= 3;
577 }
578 tif->tif_rawcp = op;
579 tif->tif_rawcc = tif->tif_rawdatasize - occ;
580
581 return (1);
582 }
583
584 /*
585 * Encode a row of 32-bit pixels.
586 */
587 static int
588 LogLuvEncode32(TIFF* tif, uint8* bp, tmsize_t cc, uint16 s)
589 {
590 static const char module[] = "LogLuvEncode32";
591 LogLuvState* sp = EncoderState(tif);
592 int shft;
593 tmsize_t i;
594 tmsize_t j;
595 tmsize_t npixels;
596 uint8* op;
597 uint32* tp;
598 uint32 b;
599 tmsize_t occ;
600 int rc=0, mask;
601 tmsize_t beg;
602
603 assert(s == 0);
604 assert(sp != NULL);
605
606 npixels = cc / sp->pixel_size;
607
608 if (sp->user_datafmt == SGILOGDATAFMT_RAW)
609 tp = (uint32*) bp;
610 else {
611 tp = (uint32*) sp->tbuf;
612 if(sp->tbuflen < npixels) {
613 TIFFErrorExt(tif->tif_clientdata, module,
614 "Translation buffer too short");
615 return (0);
616 }
617 (*sp->tfunc)(sp, bp, npixels);
618 }
619 /* compress each byte string */
620 op = tif->tif_rawcp;
621 occ = tif->tif_rawdatasize - tif->tif_rawcc;
622 for (shft = 4*8; (shft -= 8) >= 0; )
623 for (i = 0; i < npixels; i += rc) {
624 if (occ < 4) {
625 tif->tif_rawcp = op;
626 tif->tif_rawcc = tif->tif_rawdatasize - occ;
627 if (!TIFFFlushData1(tif))
628 return (0);
629 op = tif->tif_rawcp;
630 occ = tif->tif_rawdatasize - tif->tif_rawcc;
631 }
632 mask = 0xff << shft; /* find next run */
633 for (beg = i; beg < npixels; beg += rc) {
634 b = tp[beg] & mask;
635 rc = 1;
636 while (rc < 127+2 && beg+rc < npixels &&
637 (tp[beg+rc] & mask) == b)
638 rc++;
639 if (rc >= MINRUN)
640 break; /* long enough */
641 }
642 if (beg-i > 1 && beg-i < MINRUN) {
643 b = tp[i] & mask; /* check short run */
644 j = i+1;
645 while ((tp[j++] & mask) == b)
646 if (j == beg) {
647 *op++ = (uint8)(128-2+j-i);
648 *op++ = (uint8)(b >> shft);
649 occ -= 2;
650 i = beg;
651 break;
652 }
653 }
654 while (i < beg) { /* write out non-run */
655 if ((j = beg-i) > 127) j = 127;
656 if (occ < j+3) {
657 tif->tif_rawcp = op;
658 tif->tif_rawcc = tif->tif_rawdatasize - occ;
659 if (!TIFFFlushData1(tif))
660 return (0);
661 op = tif->tif_rawcp;
662 occ = tif->tif_rawdatasize - tif->tif_rawcc;
663 }
664 *op++ = (uint8) j; occ--;
665 while (j--) {
666 *op++ = (uint8)(tp[i++] >> shft & 0xff);
667 occ--;
668 }
669 }
670 if (rc >= MINRUN) { /* write out run */
671 *op++ = (uint8) (128-2+rc);
672 *op++ = (uint8)(tp[beg] >> shft & 0xff);
673 occ -= 2;
674 } else
675 rc = 0;
676 }
677 tif->tif_rawcp = op;
678 tif->tif_rawcc = tif->tif_rawdatasize - occ;
679
680 return (1);
681 }
682
683 /*
684 * Encode a strip of pixels. We break it into rows to
685 * avoid encoding runs across row boundaries.
686 */
687 static int
688 LogLuvEncodeStrip(TIFF* tif, uint8* bp, tmsize_t cc, uint16 s)
689 {
690 tmsize_t rowlen = TIFFScanlineSize(tif);
691
692 if (rowlen == 0)
693 return 0;
694
695 assert(cc%rowlen == 0);
696 while (cc && (*tif->tif_encoderow)(tif, bp, rowlen, s) == 1) {
697 bp += rowlen;
698 cc -= rowlen;
699 }
700 return (cc == 0);
701 }
702
703 /*
704 * Encode a tile of pixels. We break it into rows to
705 * avoid encoding runs across row boundaries.
706 */
707 static int
708 LogLuvEncodeTile(TIFF* tif, uint8* bp, tmsize_t cc, uint16 s)
709 {
710 tmsize_t rowlen = TIFFTileRowSize(tif);
711
712 if (rowlen == 0)
713 return 0;
714
715 assert(cc%rowlen == 0);
716 while (cc && (*tif->tif_encoderow)(tif, bp, rowlen, s) == 1) {
717 bp += rowlen;
718 cc -= rowlen;
719 }
720 return (cc == 0);
721 }
722
723 /*
724 * Encode/Decode functions for converting to and from user formats.
725 */
726
727 #include "uvcode.h"
728
729 #ifndef UVSCALE
730 #define U_NEU 0.210526316
731 #define V_NEU 0.473684211
732 #define UVSCALE 410.
733 #endif
734
735 #ifndef M_LN2
736 #define M_LN2 0.69314718055994530942
737 #endif
738 #ifndef M_PI
739 #define M_PI 3.14159265358979323846
740 #endif
741 #undef log2 /* Conflict with C'99 function */
742 #define log2(x) ((1./M_LN2)*log(x))
743 #undef exp2 /* Conflict with C'99 function */
744 #define exp2(x) exp(M_LN2*(x))
745
746 #define itrunc(x,m) ((m)==SGILOGENCODE_NODITHER ? \
747 (int)(x) : \
748 (int)((x) + rand()*(1./RAND_MAX) - .5))
749
750 #if !LOGLUV_PUBLIC
751 static
752 #endif
753 double
754 LogL16toY(int p16) /* compute luminance from 16-bit LogL */
755 {
756 int Le = p16 & 0x7fff;
757 double Y;
758
759 if (!Le)
760 return (0.);
761 Y = exp(M_LN2/256.*(Le+.5) - M_LN2*64.);
762 return (!(p16 & 0x8000) ? Y : -Y);
763 }
764
765 #if !LOGLUV_PUBLIC
766 static
767 #endif
768 int
769 LogL16fromY(double Y, int em) /* get 16-bit LogL from Y */
770 {
771 if (Y >= 1.8371976e19)
772 return (0x7fff);
773 if (Y <= -1.8371976e19)
774 return (0xffff);
775 if (Y > 5.4136769e-20)
776 return itrunc(256.*(log2(Y) + 64.), em);
777 if (Y < -5.4136769e-20)
778 return (~0x7fff | itrunc(256.*(log2(-Y) + 64.), em));
779 return (0);
780 }
781
782 static void
783 L16toY(LogLuvState* sp, uint8* op, tmsize_t n)
784 {
785 int16* l16 = (int16*) sp->tbuf;
786 float* yp = (float*) op;
787
788 while (n-- > 0)
789 *yp++ = (float)LogL16toY(*l16++);
790 }
791
792 static void
793 L16toGry(LogLuvState* sp, uint8* op, tmsize_t n)
794 {
795 int16* l16 = (int16*) sp->tbuf;
796 uint8* gp = (uint8*) op;
797
798 while (n-- > 0) {
799 double Y = LogL16toY(*l16++);
800 *gp++ = (uint8) ((Y <= 0.) ? 0 : (Y >= 1.) ? 255 : (int)(256.*sqrt(Y)));
801 }
802 }
803
804 static void
805 L16fromY(LogLuvState* sp, uint8* op, tmsize_t n)
806 {
807 int16* l16 = (int16*) sp->tbuf;
808 float* yp = (float*) op;
809
810 while (n-- > 0)
811 *l16++ = (int16) (LogL16fromY(*yp++, sp->encode_meth));
812 }
813
814 #if !LOGLUV_PUBLIC
815 static
816 #endif
817 void
818 XYZtoRGB24(float xyz[3], uint8 rgb[3])
819 {
820 double r, g, b;
821 /* assume CCIR-709 primaries */
822 r = 2.690*xyz[0] + -1.276*xyz[1] + -0.414*xyz[2];
823 g = -1.022*xyz[0] + 1.978*xyz[1] + 0.044*xyz[2];
824 b = 0.061*xyz[0] + -0.224*xyz[1] + 1.163*xyz[2];
825 /* assume 2.0 gamma for speed */
826 /* could use integer sqrt approx., but this is probably faster */
827 rgb[0] = (uint8)((r<=0.) ? 0 : (r >= 1.) ? 255 : (int)(256.*sqrt(r)));
828 rgb[1] = (uint8)((g<=0.) ? 0 : (g >= 1.) ? 255 : (int)(256.*sqrt(g)));
829 rgb[2] = (uint8)((b<=0.) ? 0 : (b >= 1.) ? 255 : (int)(256.*sqrt(b)));
830 }
831
832 #if !LOGLUV_PUBLIC
833 static
834 #endif
835 double
836 LogL10toY(int p10) /* compute luminance from 10-bit LogL */
837 {
838 if (p10 == 0)
839 return (0.);
840 return (exp(M_LN2/64.*(p10+.5) - M_LN2*12.));
841 }
842
843 #if !LOGLUV_PUBLIC
844 static
845 #endif
846 int
847 LogL10fromY(double Y, int em) /* get 10-bit LogL from Y */
848 {
849 if (Y >= 15.742)
850 return (0x3ff);
851 else if (Y <= .00024283)
852 return (0);
853 else
854 return itrunc(64.*(log2(Y) + 12.), em);
855 }
856
857 #define NANGLES 100
858 #define uv2ang(u, v) ( (NANGLES*.499999999/M_PI) \
859 * atan2((v)-V_NEU,(u)-U_NEU) + .5*NANGLES )
860
861 static int
862 oog_encode(double u, double v) /* encode out-of-gamut chroma */
863 {
864 static int oog_table[NANGLES];
865 static int initialized = 0;
866 register int i;
867
868 if (!initialized) { /* set up perimeter table */
869 double eps[NANGLES], ua, va, ang, epsa;
870 int ui, vi, ustep;
871 for (i = NANGLES; i--; )
872 eps[i] = 2.;
873 for (vi = UV_NVS; vi--; ) {
874 va = UV_VSTART + (vi+.5)*UV_SQSIZ;
875 ustep = uv_row[vi].nus-1;
876 if (vi == UV_NVS-1 || vi == 0 || ustep <= 0)
877 ustep = 1;
878 for (ui = uv_row[vi].nus-1; ui >= 0; ui -= ustep) {
879 ua = uv_row[vi].ustart + (ui+.5)*UV_SQSIZ;
880 ang = uv2ang(ua, va);
881 i = (int) ang;
882 epsa = fabs(ang - (i+.5));
883 if (epsa < eps[i]) {
884 oog_table[i] = uv_row[vi].ncum + ui;
885 eps[i] = epsa;
886 }
887 }
888 }
889 for (i = NANGLES; i--; ) /* fill any holes */
890 if (eps[i] > 1.5) {
891 int i1, i2;
892 for (i1 = 1; i1 < NANGLES/2; i1++)
893 if (eps[(i+i1)%NANGLES] < 1.5)
894 break;
895 for (i2 = 1; i2 < NANGLES/2; i2++)
896 if (eps[(i+NANGLES-i2)%NANGLES] < 1.5)
897 break;
898 if (i1 < i2)
899 oog_table[i] =
900 oog_table[(i+i1)%NANGLES];
901 else
902 oog_table[i] =
903 oog_table[(i+NANGLES-i2)%NANGLES];
904 }
905 initialized = 1;
906 }
907 i = (int) uv2ang(u, v); /* look up hue angle */
908 return (oog_table[i]);
909 }
910
911 #undef uv2ang
912 #undef NANGLES
913
914 #if !LOGLUV_PUBLIC
915 static
916 #endif
917 int
918 uv_encode(double u, double v, int em) /* encode (u',v') coordinates */
919 {
920 register int vi, ui;
921
922 if (v < UV_VSTART)
923 return oog_encode(u, v);
924 vi = itrunc((v - UV_VSTART)*(1./UV_SQSIZ), em);
925 if (vi >= UV_NVS)
926 return oog_encode(u, v);
927 if (u < uv_row[vi].ustart)
928 return oog_encode(u, v);
929 ui = itrunc((u - uv_row[vi].ustart)*(1./UV_SQSIZ), em);
930 if (ui >= uv_row[vi].nus)
931 return oog_encode(u, v);
932
933 return (uv_row[vi].ncum + ui);
934 }
935
936 #if !LOGLUV_PUBLIC
937 static
938 #endif
939 int
940 uv_decode(double *up, double *vp, int c) /* decode (u',v') index */
941 {
942 int upper, lower;
943 register int ui, vi;
944
945 if (c < 0 || c >= UV_NDIVS)
946 return (-1);
947 lower = 0; /* binary search */
948 upper = UV_NVS;
949 while (upper - lower > 1) {
950 vi = (lower + upper) >> 1;
951 ui = c - uv_row[vi].ncum;
952 if (ui > 0)
953 lower = vi;
954 else if (ui < 0)
955 upper = vi;
956 else {
957 lower = vi;
958 break;
959 }
960 }
961 vi = lower;
962 ui = c - uv_row[vi].ncum;
963 *up = uv_row[vi].ustart + (ui+.5)*UV_SQSIZ;
964 *vp = UV_VSTART + (vi+.5)*UV_SQSIZ;
965 return (0);
966 }
967
968 #if !LOGLUV_PUBLIC
969 static
970 #endif
971 void
972 LogLuv24toXYZ(uint32 p, float XYZ[3])
973 {
974 int Ce;
975 double L, u, v, s, x, y;
976 /* decode luminance */
977 L = LogL10toY(p>>14 & 0x3ff);
978 if (L <= 0.) {
979 XYZ[0] = XYZ[1] = XYZ[2] = 0.;
980 return;
981 }
982 /* decode color */
983 Ce = p & 0x3fff;
984 if (uv_decode(&u, &v, Ce) < 0) {
985 u = U_NEU; v = V_NEU;
986 }
987 s = 1./(6.*u - 16.*v + 12.);
988 x = 9.*u * s;
989 y = 4.*v * s;
990 /* convert to XYZ */
991 XYZ[0] = (float)(x/y * L);
992 XYZ[1] = (float)L;
993 XYZ[2] = (float)((1.-x-y)/y * L);
994 }
995
996 #if !LOGLUV_PUBLIC
997 static
998 #endif
999 uint32
1000 LogLuv24fromXYZ(float XYZ[3], int em)
1001 {
1002 int Le, Ce;
1003 double u, v, s;
1004 /* encode luminance */
1005 Le = LogL10fromY(XYZ[1], em);
1006 /* encode color */
1007 s = XYZ[0] + 15.*XYZ[1] + 3.*XYZ[2];
1008 if (!Le || s <= 0.) {
1009 u = U_NEU;
1010 v = V_NEU;
1011 } else {
1012 u = 4.*XYZ[0] / s;
1013 v = 9.*XYZ[1] / s;
1014 }
1015 Ce = uv_encode(u, v, em);
1016 if (Ce < 0) /* never happens */
1017 Ce = uv_encode(U_NEU, V_NEU, SGILOGENCODE_NODITHER);
1018 /* combine encodings */
1019 return (Le << 14 | Ce);
1020 }
1021
1022 static void
1023 Luv24toXYZ(LogLuvState* sp, uint8* op, tmsize_t n)
1024 {
1025 uint32* luv = (uint32*) sp->tbuf;
1026 float* xyz = (float*) op;
1027
1028 while (n-- > 0) {
1029 LogLuv24toXYZ(*luv, xyz);
1030 xyz += 3;
1031 luv++;
1032 }
1033 }
1034
1035 static void
1036 Luv24toLuv48(LogLuvState* sp, uint8* op, tmsize_t n)
1037 {
1038 uint32* luv = (uint32*) sp->tbuf;
1039 int16* luv3 = (int16*) op;
1040
1041 while (n-- > 0) {
1042 double u, v;
1043
1044 *luv3++ = (int16)((*luv >> 12 & 0xffd) + 13314);
1045 if (uv_decode(&u, &v, *luv&0x3fff) < 0) {
1046 u = U_NEU;
1047 v = V_NEU;
1048 }
1049 *luv3++ = (int16)(u * (1L<<15));
1050 *luv3++ = (int16)(v * (1L<<15));
1051 luv++;
1052 }
1053 }
1054
1055 static void
1056 Luv24toRGB(LogLuvState* sp, uint8* op, tmsize_t n)
1057 {
1058 uint32* luv = (uint32*) sp->tbuf;
1059 uint8* rgb = (uint8*) op;
1060
1061 while (n-- > 0) {
1062 float xyz[3];
1063
1064 LogLuv24toXYZ(*luv++, xyz);
1065 XYZtoRGB24(xyz, rgb);
1066 rgb += 3;
1067 }
1068 }
1069
1070 static void
1071 Luv24fromXYZ(LogLuvState* sp, uint8* op, tmsize_t n)
1072 {
1073 uint32* luv = (uint32*) sp->tbuf;
1074 float* xyz = (float*) op;
1075
1076 while (n-- > 0) {
1077 *luv++ = LogLuv24fromXYZ(xyz, sp->encode_meth);
1078 xyz += 3;
1079 }
1080 }
1081
1082 static void
1083 Luv24fromLuv48(LogLuvState* sp, uint8* op, tmsize_t n)
1084 {
1085 uint32* luv = (uint32*) sp->tbuf;
1086 int16* luv3 = (int16*) op;
1087
1088 while (n-- > 0) {
1089 int Le, Ce;
1090
1091 if (luv3[0] <= 0)
1092 Le = 0;
1093 else if (luv3[0] >= (1<<12)+3314)
1094 Le = (1<<10) - 1;
1095 else if (sp->encode_meth == SGILOGENCODE_NODITHER)
1096 Le = (luv3[0]-3314) >> 2;
1097 else
1098 Le = itrunc(.25*(luv3[0]-3314.), sp->encode_meth);
1099
1100 Ce = uv_encode((luv3[1]+.5)/(1<<15), (luv3[2]+.5)/(1<<15),
1101 sp->encode_meth);
1102 if (Ce < 0) /* never happens */
1103 Ce = uv_encode(U_NEU, V_NEU, SGILOGENCODE_NODITHER);
1104 *luv++ = (uint32)Le << 14 | Ce;
1105 luv3 += 3;
1106 }
1107 }
1108
1109 #if !LOGLUV_PUBLIC
1110 static
1111 #endif
1112 void
1113 LogLuv32toXYZ(uint32 p, float XYZ[3])
1114 {
1115 double L, u, v, s, x, y;
1116 /* decode luminance */
1117 L = LogL16toY((int)p >> 16);
1118 if (L <= 0.) {
1119 XYZ[0] = XYZ[1] = XYZ[2] = 0.;
1120 return;
1121 }
1122 /* decode color */
1123 u = 1./UVSCALE * ((p>>8 & 0xff) + .5);
1124 v = 1./UVSCALE * ((p & 0xff) + .5);
1125 s = 1./(6.*u - 16.*v + 12.);
1126 x = 9.*u * s;
1127 y = 4.*v * s;
1128 /* convert to XYZ */
1129 XYZ[0] = (float)(x/y * L);
1130 XYZ[1] = (float)L;
1131 XYZ[2] = (float)((1.-x-y)/y * L);
1132 }
1133
1134 #if !LOGLUV_PUBLIC
1135 static
1136 #endif
1137 uint32
1138 LogLuv32fromXYZ(float XYZ[3], int em)
1139 {
1140 unsigned int Le, ue, ve;
1141 double u, v, s;
1142 /* encode luminance */
1143 Le = (unsigned int)LogL16fromY(XYZ[1], em);
1144 /* encode color */
1145 s = XYZ[0] + 15.*XYZ[1] + 3.*XYZ[2];
1146 if (!Le || s <= 0.) {
1147 u = U_NEU;
1148 v = V_NEU;
1149 } else {
1150 u = 4.*XYZ[0] / s;
1151 v = 9.*XYZ[1] / s;
1152 }
1153 if (u <= 0.) ue = 0;
1154 else ue = itrunc(UVSCALE*u, em);
1155 if (ue > 255) ue = 255;
1156 if (v <= 0.) ve = 0;
1157 else ve = itrunc(UVSCALE*v, em);
1158 if (ve > 255) ve = 255;
1159 /* combine encodings */
1160 return (Le << 16 | ue << 8 | ve);
1161 }
1162
1163 static void
1164 Luv32toXYZ(LogLuvState* sp, uint8* op, tmsize_t n)
1165 {
1166 uint32* luv = (uint32*) sp->tbuf;
1167 float* xyz = (float*) op;
1168
1169 while (n-- > 0) {
1170 LogLuv32toXYZ(*luv++, xyz);
1171 xyz += 3;
1172 }
1173 }
1174
1175 static void
1176 Luv32toLuv48(LogLuvState* sp, uint8* op, tmsize_t n)
1177 {
1178 uint32* luv = (uint32*) sp->tbuf;
1179 int16* luv3 = (int16*) op;
1180
1181 while (n-- > 0) {
1182 double u, v;
1183
1184 *luv3++ = (int16)(*luv >> 16);
1185 u = 1./UVSCALE * ((*luv>>8 & 0xff) + .5);
1186 v = 1./UVSCALE * ((*luv & 0xff) + .5);
1187 *luv3++ = (int16)(u * (1L<<15));
1188 *luv3++ = (int16)(v * (1L<<15));
1189 luv++;
1190 }
1191 }
1192
1193 static void
1194 Luv32toRGB(LogLuvState* sp, uint8* op, tmsize_t n)
1195 {
1196 uint32* luv = (uint32*) sp->tbuf;
1197 uint8* rgb = (uint8*) op;
1198
1199 while (n-- > 0) {
1200 float xyz[3];
1201
1202 LogLuv32toXYZ(*luv++, xyz);
1203 XYZtoRGB24(xyz, rgb);
1204 rgb += 3;
1205 }
1206 }
1207
1208 static void
1209 Luv32fromXYZ(LogLuvState* sp, uint8* op, tmsize_t n)
1210 {
1211 uint32* luv = (uint32*) sp->tbuf;
1212 float* xyz = (float*) op;
1213
1214 while (n-- > 0) {
1215 *luv++ = LogLuv32fromXYZ(xyz, sp->encode_meth);
1216 xyz += 3;
1217 }
1218 }
1219
1220 static void
1221 Luv32fromLuv48(LogLuvState* sp, uint8* op, tmsize_t n)
1222 {
1223 uint32* luv = (uint32*) sp->tbuf;
1224 int16* luv3 = (int16*) op;
1225
1226 if (sp->encode_meth == SGILOGENCODE_NODITHER) {
1227 while (n-- > 0) {
1228 *luv++ = (uint32)luv3[0] << 16 |
1229 (luv3[1]*(uint32)(UVSCALE+.5) >> 7 & 0xff00) |
1230 (luv3[2]*(uint32)(UVSCALE+.5) >> 15 & 0xff);
1231 luv3 += 3;
1232 }
1233 return;
1234 }
1235 while (n-- > 0) {
1236 *luv++ = (uint32)luv3[0] << 16 |
1237 (itrunc(luv3[1]*(UVSCALE/(1<<15)), sp->encode_meth) << 8 & 0xff00) |
1238 (itrunc(luv3[2]*(UVSCALE/(1<<15)), sp->encode_meth) & 0xff);
1239 luv3 += 3;
1240 }
1241 }
1242
1243 static void
1244 _logLuvNop(LogLuvState* sp, uint8* op, tmsize_t n)
1245 {
1246 (void) sp; (void) op; (void) n;
1247 }
1248
1249 static int
1250 LogL16GuessDataFmt(TIFFDirectory *td)
1251 {
1252 #define PACK(s,b,f) (((b)<<6)|((s)<<3)|(f))
1253 switch (PACK(td->td_samplesperpixel, td->td_bitspersample, td->td_sampleformat)) {
1254 case PACK(1, 32, SAMPLEFORMAT_IEEEFP):
1255 return (SGILOGDATAFMT_FLOAT);
1256 case PACK(1, 16, SAMPLEFORMAT_VOID):
1257 case PACK(1, 16, SAMPLEFORMAT_INT):
1258 case PACK(1, 16, SAMPLEFORMAT_UINT):
1259 return (SGILOGDATAFMT_16BIT);
1260 case PACK(1, 8, SAMPLEFORMAT_VOID):
1261 case PACK(1, 8, SAMPLEFORMAT_UINT):
1262 return (SGILOGDATAFMT_8BIT);
1263 }
1264 #undef PACK
1265 return (SGILOGDATAFMT_UNKNOWN);
1266 }
1267
1268
1269 #define TIFF_SIZE_T_MAX ((size_t) ~ ((size_t)0))
1270 #define TIFF_TMSIZE_T_MAX (tmsize_t)(TIFF_SIZE_T_MAX >> 1)
1271
1272 static tmsize_t
1273 multiply_ms(tmsize_t m1, tmsize_t m2)
1274 {
1275 if( m1 == 0 || m2 > TIFF_TMSIZE_T_MAX / m1 )
1276 return 0;
1277 return m1 * m2;
1278 }
1279
1280 static int
1281 LogL16InitState(TIFF* tif)
1282 {
1283 static const char module[] = "LogL16InitState";
1284 TIFFDirectory *td = &tif->tif_dir;
1285 LogLuvState* sp = DecoderState(tif);
1286
1287 assert(sp != NULL);
1288 assert(td->td_photometric == PHOTOMETRIC_LOGL);
1289
1290 if( td->td_samplesperpixel != 1 )
1291 {
1292 TIFFErrorExt(tif->tif_clientdata, module,
1293 "Sorry, can not handle LogL image with %s=%d",
1294 "Samples/pixel", td->td_samplesperpixel);
1295 return 0;
1296 }
1297
1298 /* for some reason, we can't do this in TIFFInitLogL16 */
1299 if (sp->user_datafmt == SGILOGDATAFMT_UNKNOWN)
1300 sp->user_datafmt = LogL16GuessDataFmt(td);
1301 switch (sp->user_datafmt) {
1302 case SGILOGDATAFMT_FLOAT:
1303 sp->pixel_size = sizeof (float);
1304 break;
1305 case SGILOGDATAFMT_16BIT:
1306 sp->pixel_size = sizeof (int16);
1307 break;
1308 case SGILOGDATAFMT_8BIT:
1309 sp->pixel_size = sizeof (uint8);
1310 break;
1311 default:
1312 TIFFErrorExt(tif->tif_clientdata, module,
1313 "No support for converting user data format to LogL");
1314 return (0);
1315 }
1316 if( isTiled(tif) )
1317 sp->tbuflen = multiply_ms(td->td_tilewidth, td->td_tilelength);
1318 else if( td->td_rowsperstrip != (uint32)-1 )
1319 sp->tbuflen = multiply_ms(td->td_imagewidth, td->td_rowsperstrip);
1320 else
1321 sp->tbuflen = multiply_ms(td->td_imagewidth, td->td_imagelength);
1322 if (multiply_ms(sp->tbuflen, sizeof (int16)) == 0 ||
1323 (sp->tbuf = (uint8*) _TIFFmalloc(sp->tbuflen * sizeof (int16))) == NULL) {
1324 TIFFErrorExt(tif->tif_clientdata, module, "No space for SGILog translation buffer");
1325 return (0);
1326 }
1327 return (1);
1328 }
1329
1330 static int
1331 LogLuvGuessDataFmt(TIFFDirectory *td)
1332 {
1333 int guess;
1334
1335 /*
1336 * If the user didn't tell us their datafmt,
1337 * take our best guess from the bitspersample.
1338 */
1339 #define PACK(a,b) (((a)<<3)|(b))
1340 switch (PACK(td->td_bitspersample, td->td_sampleformat)) {
1341 case PACK(32, SAMPLEFORMAT_IEEEFP):
1342 guess = SGILOGDATAFMT_FLOAT;
1343 break;
1344 case PACK(32, SAMPLEFORMAT_VOID):
1345 case PACK(32, SAMPLEFORMAT_UINT):
1346 case PACK(32, SAMPLEFORMAT_INT):
1347 guess = SGILOGDATAFMT_RAW;
1348 break;
1349 case PACK(16, SAMPLEFORMAT_VOID):
1350 case PACK(16, SAMPLEFORMAT_INT):
1351 case PACK(16, SAMPLEFORMAT_UINT):
1352 guess = SGILOGDATAFMT_16BIT;
1353 break;
1354 case PACK( 8, SAMPLEFORMAT_VOID):
1355 case PACK( 8, SAMPLEFORMAT_UINT):
1356 guess = SGILOGDATAFMT_8BIT;
1357 break;
1358 default:
1359 guess = SGILOGDATAFMT_UNKNOWN;
1360 break;
1361 #undef PACK
1362 }
1363 /*
1364 * Double-check samples per pixel.
1365 */
1366 switch (td->td_samplesperpixel) {
1367 case 1:
1368 if (guess != SGILOGDATAFMT_RAW)
1369 guess = SGILOGDATAFMT_UNKNOWN;
1370 break;
1371 case 3:
1372 if (guess == SGILOGDATAFMT_RAW)
1373 guess = SGILOGDATAFMT_UNKNOWN;
1374 break;
1375 default:
1376 guess = SGILOGDATAFMT_UNKNOWN;
1377 break;
1378 }
1379 return (guess);
1380 }
1381
1382 static int
1383 LogLuvInitState(TIFF* tif)
1384 {
1385 static const char module[] = "LogLuvInitState";
1386 TIFFDirectory* td = &tif->tif_dir;
1387 LogLuvState* sp = DecoderState(tif);
1388
1389 assert(sp != NULL);
1390 assert(td->td_photometric == PHOTOMETRIC_LOGLUV);
1391
1392 /* for some reason, we can't do this in TIFFInitLogLuv */
1393 if (td->td_planarconfig != PLANARCONFIG_CONTIG) {
1394 TIFFErrorExt(tif->tif_clientdata, module,
1395 "SGILog compression cannot handle non-contiguous data");
1396 return (0);
1397 }
1398 if (sp->user_datafmt == SGILOGDATAFMT_UNKNOWN)
1399 sp->user_datafmt = LogLuvGuessDataFmt(td);
1400 switch (sp->user_datafmt) {
1401 case SGILOGDATAFMT_FLOAT:
1402 sp->pixel_size = 3*sizeof (float);
1403 break;
1404 case SGILOGDATAFMT_16BIT:
1405 sp->pixel_size = 3*sizeof (int16);
1406 break;
1407 case SGILOGDATAFMT_RAW:
1408 sp->pixel_size = sizeof (uint32);
1409 break;
1410 case SGILOGDATAFMT_8BIT:
1411 sp->pixel_size = 3*sizeof (uint8);
1412 break;
1413 default:
1414 TIFFErrorExt(tif->tif_clientdata, module,
1415 "No support for converting user data format to LogLuv");
1416 return (0);
1417 }
1418 if( isTiled(tif) )
1419 sp->tbuflen = multiply_ms(td->td_tilewidth, td->td_tilelength);
1420 else
1421 sp->tbuflen = multiply_ms(td->td_imagewidth, td->td_rowsperstrip);
1422 if (multiply_ms(sp->tbuflen, sizeof (uint32)) == 0 ||
1423 (sp->tbuf = (uint8*) _TIFFmalloc(sp->tbuflen * sizeof (uint32))) == NULL) {
1424 TIFFErrorExt(tif->tif_clientdata, module, "No space for SGILog translation buffer");
1425 return (0);
1426 }
1427 return (1);
1428 }
1429
1430 static int
1431 LogLuvFixupTags(TIFF* tif)
1432 {
1433 (void) tif;
1434 return (1);
1435 }
1436
1437 static int
1438 LogLuvSetupDecode(TIFF* tif)
1439 {
1440 static const char module[] = "LogLuvSetupDecode";
1441 LogLuvState* sp = DecoderState(tif);
1442 TIFFDirectory* td = &tif->tif_dir;
1443
1444 tif->tif_postdecode = _TIFFNoPostDecode;
1445 switch (td->td_photometric) {
1446 case PHOTOMETRIC_LOGLUV:
1447 if (!LogLuvInitState(tif))
1448 break;
1449 if (td->td_compression == COMPRESSION_SGILOG24) {
1450 tif->tif_decoderow = LogLuvDecode24;
1451 switch (sp->user_datafmt) {
1452 case SGILOGDATAFMT_FLOAT:
1453 sp->tfunc = Luv24toXYZ;
1454 break;
1455 case SGILOGDATAFMT_16BIT:
1456 sp->tfunc = Luv24toLuv48;
1457 break;
1458 case SGILOGDATAFMT_8BIT:
1459 sp->tfunc = Luv24toRGB;
1460 break;
1461 }
1462 } else {
1463 tif->tif_decoderow = LogLuvDecode32;
1464 switch (sp->user_datafmt) {
1465 case SGILOGDATAFMT_FLOAT:
1466 sp->tfunc = Luv32toXYZ;
1467 break;
1468 case SGILOGDATAFMT_16BIT:
1469 sp->tfunc = Luv32toLuv48;
1470 break;
1471 case SGILOGDATAFMT_8BIT:
1472 sp->tfunc = Luv32toRGB;
1473 break;
1474 }
1475 }
1476 return (1);
1477 case PHOTOMETRIC_LOGL:
1478 if (!LogL16InitState(tif))
1479 break;
1480 tif->tif_decoderow = LogL16Decode;
1481 switch (sp->user_datafmt) {
1482 case SGILOGDATAFMT_FLOAT:
1483 sp->tfunc = L16toY;
1484 break;
1485 case SGILOGDATAFMT_8BIT:
1486 sp->tfunc = L16toGry;
1487 break;
1488 }
1489 return (1);
1490 default:
1491 TIFFErrorExt(tif->tif_clientdata, module,
1492 "Inappropriate photometric interpretation %d for SGILog compression; %s",
1493 td->td_photometric, "must be either LogLUV or LogL");
1494 break;
1495 }
1496 return (0);
1497 }
1498
1499 static int
1500 LogLuvSetupEncode(TIFF* tif)
1501 {
1502 static const char module[] = "LogLuvSetupEncode";
1503 LogLuvState* sp = EncoderState(tif);
1504 TIFFDirectory* td = &tif->tif_dir;
1505
1506 switch (td->td_photometric) {
1507 case PHOTOMETRIC_LOGLUV:
1508 if (!LogLuvInitState(tif))
1509 break;
1510 if (td->td_compression == COMPRESSION_SGILOG24) {
1511 tif->tif_encoderow = LogLuvEncode24;
1512 switch (sp->user_datafmt) {
1513 case SGILOGDATAFMT_FLOAT:
1514 sp->tfunc = Luv24fromXYZ;
1515 break;
1516 case SGILOGDATAFMT_16BIT:
1517 sp->tfunc = Luv24fromLuv48;
1518 break;
1519 case SGILOGDATAFMT_RAW:
1520 break;
1521 default:
1522 goto notsupported;
1523 }
1524 } else {
1525 tif->tif_encoderow = LogLuvEncode32;
1526 switch (sp->user_datafmt) {
1527 case SGILOGDATAFMT_FLOAT:
1528 sp->tfunc = Luv32fromXYZ;
1529 break;
1530 case SGILOGDATAFMT_16BIT:
1531 sp->tfunc = Luv32fromLuv48;
1532 break;
1533 case SGILOGDATAFMT_RAW:
1534 break;
1535 default:
1536 goto notsupported;
1537 }
1538 }
1539 break;
1540 case PHOTOMETRIC_LOGL:
1541 if (!LogL16InitState(tif))
1542 break;
1543 tif->tif_encoderow = LogL16Encode;
1544 switch (sp->user_datafmt) {
1545 case SGILOGDATAFMT_FLOAT:
1546 sp->tfunc = L16fromY;
1547 break;
1548 case SGILOGDATAFMT_16BIT:
1549 break;
1550 default:
1551 goto notsupported;
1552 }
1553 break;
1554 default:
1555 TIFFErrorExt(tif->tif_clientdata, module,
1556 "Inappropriate photometric interpretation %d for SGILog compression; %s",
1557 td->td_photometric, "must be either LogLUV or LogL");
1558 break;
1559 }
1560 sp->encoder_state = 1;
1561 return (1);
1562 notsupported:
1563 TIFFErrorExt(tif->tif_clientdata, module,
1564 "SGILog compression supported only for %s, or raw data",
1565 td->td_photometric == PHOTOMETRIC_LOGL ? "Y, L" : "XYZ, Luv");
1566 return (0);
1567 }
1568
1569 static void
1570 LogLuvClose(TIFF* tif)
1571 {
1572 LogLuvState* sp = (LogLuvState*) tif->tif_data;
1573 TIFFDirectory *td = &tif->tif_dir;
1574
1575 assert(sp != 0);
1576 /*
1577 * For consistency, we always want to write out the same
1578 * bitspersample and sampleformat for our TIFF file,
1579 * regardless of the data format being used by the application.
1580 * Since this routine is called after tags have been set but
1581 * before they have been recorded in the file, we reset them here.
1582 * Note: this is really a nasty approach. See PixarLogClose
1583 */
1584 if( sp->encoder_state )
1585 {
1586 /* See PixarLogClose. Might avoid issues with tags whose size depends
1587 * on those below, but not completely sure this is enough. */
1588 td->td_samplesperpixel =
1589 (td->td_photometric == PHOTOMETRIC_LOGL) ? 1 : 3;
1590 td->td_bitspersample = 16;
1591 td->td_sampleformat = SAMPLEFORMAT_INT;
1592 }
1593 }
1594
1595 static void
1596 LogLuvCleanup(TIFF* tif)
1597 {
1598 LogLuvState* sp = (LogLuvState *)tif->tif_data;
1599
1600 assert(sp != 0);
1601
1602 tif->tif_tagmethods.vgetfield = sp->vgetparent;
1603 tif->tif_tagmethods.vsetfield = sp->vsetparent;
1604
1605 if (sp->tbuf)
1606 _TIFFfree(sp->tbuf);
1607 _TIFFfree(sp);
1608 tif->tif_data = NULL;
1609
1610 _TIFFSetDefaultCompressionState(tif);
1611 }
1612
1613 static int
1614 LogLuvVSetField(TIFF* tif, uint32 tag, va_list ap)
1615 {
1616 static const char module[] = "LogLuvVSetField";
1617 LogLuvState* sp = DecoderState(tif);
1618 int bps, fmt;
1619
1620 switch (tag) {
1621 case TIFFTAG_SGILOGDATAFMT:
1622 sp->user_datafmt = (int) va_arg(ap, int);
1623 /*
1624 * Tweak the TIFF header so that the rest of libtiff knows what
1625 * size of data will be passed between app and library, and
1626 * assume that the app knows what it is doing and is not
1627 * confused by these header manipulations...
1628 */
1629 switch (sp->user_datafmt) {
1630 case SGILOGDATAFMT_FLOAT:
1631 bps = 32;
1632 fmt = SAMPLEFORMAT_IEEEFP;
1633 break;
1634 case SGILOGDATAFMT_16BIT:
1635 bps = 16;
1636 fmt = SAMPLEFORMAT_INT;
1637 break;
1638 case SGILOGDATAFMT_RAW:
1639 bps = 32;
1640 fmt = SAMPLEFORMAT_UINT;
1641 TIFFSetField(tif, TIFFTAG_SAMPLESPERPIXEL, 1);
1642 break;
1643 case SGILOGDATAFMT_8BIT:
1644 bps = 8;
1645 fmt = SAMPLEFORMAT_UINT;
1646 break;
1647 default:
1648 TIFFErrorExt(tif->tif_clientdata, tif->tif_name,
1649 "Unknown data format %d for LogLuv compression",
1650 sp->user_datafmt);
1651 return (0);
1652 }
1653 TIFFSetField(tif, TIFFTAG_BITSPERSAMPLE, bps);
1654 TIFFSetField(tif, TIFFTAG_SAMPLEFORMAT, fmt);
1655 /*
1656 * Must recalculate sizes should bits/sample change.
1657 */
1658 tif->tif_tilesize = isTiled(tif) ? TIFFTileSize(tif) : (tmsize_t) -1;
1659 tif->tif_scanlinesize = TIFFScanlineSize(tif);
1660 return (1);
1661 case TIFFTAG_SGILOGENCODE:
1662 sp->encode_meth = (int) va_arg(ap, int);
1663 if (sp->encode_meth != SGILOGENCODE_NODITHER &&
1664 sp->encode_meth != SGILOGENCODE_RANDITHER) {
1665 TIFFErrorExt(tif->tif_clientdata, module,
1666 "Unknown encoding %d for LogLuv compression",
1667 sp->encode_meth);
1668 return (0);
1669 }
1670 return (1);
1671 default:
1672 return (*sp->vsetparent)(tif, tag, ap);
1673 }
1674 }
1675
1676 static int
1677 LogLuvVGetField(TIFF* tif, uint32 tag, va_list ap)
1678 {
1679 LogLuvState *sp = (LogLuvState *)tif->tif_data;
1680
1681 switch (tag) {
1682 case TIFFTAG_SGILOGDATAFMT:
1683 *va_arg(ap, int*) = sp->user_datafmt;
1684 return (1);
1685 default:
1686 return (*sp->vgetparent)(tif, tag, ap);
1687 }
1688 }
1689
1690 static const TIFFField LogLuvFields[] = {
1691 { TIFFTAG_SGILOGDATAFMT, 0, 0, TIFF_SHORT, 0, TIFF_SETGET_INT, TIFF_SETGET_UNDEFINED, FIELD_PSEUDO, TRUE, FALSE, "SGILogDataFmt", NULL},
1692 { TIFFTAG_SGILOGENCODE, 0, 0, TIFF_SHORT, 0, TIFF_SETGET_INT, TIFF_SETGET_UNDEFINED, FIELD_PSEUDO, TRUE, FALSE, "SGILogEncode", NULL}
1693 };
1694
1695 int
1696 TIFFInitSGILog(TIFF* tif, int scheme)
1697 {
1698 static const char module[] = "TIFFInitSGILog";
1699 LogLuvState* sp;
1700
1701 assert(scheme == COMPRESSION_SGILOG24 || scheme == COMPRESSION_SGILOG);
1702
1703 /*
1704 * Merge codec-specific tag information.
1705 */
1706 if (!_TIFFMergeFields(tif, LogLuvFields,
1707 TIFFArrayCount(LogLuvFields))) {
1708 TIFFErrorExt(tif->tif_clientdata, module,
1709 "Merging SGILog codec-specific tags failed");
1710 return 0;
1711 }
1712
1713 /*
1714 * Allocate state block so tag methods have storage to record values.
1715 */
1716 tif->tif_data = (uint8*) _TIFFmalloc(sizeof (LogLuvState));
1717 if (tif->tif_data == NULL)
1718 goto bad;
1719 sp = (LogLuvState*) tif->tif_data;
1720 _TIFFmemset((void*)sp, 0, sizeof (*sp));
1721 sp->user_datafmt = SGILOGDATAFMT_UNKNOWN;
1722 sp->encode_meth = (scheme == COMPRESSION_SGILOG24) ?
1723 SGILOGENCODE_RANDITHER : SGILOGENCODE_NODITHER;
1724 sp->tfunc = _logLuvNop;
1725
1726 /*
1727 * Install codec methods.
1728 * NB: tif_decoderow & tif_encoderow are filled
1729 * in at setup time.
1730 */
1731 tif->tif_fixuptags = LogLuvFixupTags;
1732 tif->tif_setupdecode = LogLuvSetupDecode;
1733 tif->tif_decodestrip = LogLuvDecodeStrip;
1734 tif->tif_decodetile = LogLuvDecodeTile;
1735 tif->tif_setupencode = LogLuvSetupEncode;
1736 tif->tif_encodestrip = LogLuvEncodeStrip;
1737 tif->tif_encodetile = LogLuvEncodeTile;
1738 tif->tif_close = LogLuvClose;
1739 tif->tif_cleanup = LogLuvCleanup;
1740
1741 /*
1742 * Override parent get/set field methods.
1743 */
1744 sp->vgetparent = tif->tif_tagmethods.vgetfield;
1745 tif->tif_tagmethods.vgetfield = LogLuvVGetField; /* hook for codec tags */
1746 sp->vsetparent = tif->tif_tagmethods.vsetfield;
1747 tif->tif_tagmethods.vsetfield = LogLuvVSetField; /* hook for codec tags */
1748
1749 return (1);
1750 bad:
1751 TIFFErrorExt(tif->tif_clientdata, module,
1752 "%s: No space for LogLuv state block", tif->tif_name);
1753 return (0);
1754 }
1755 #endif /* LOGLUV_SUPPORT */
1756
1757 /* vim: set ts=8 sts=8 sw=8 noet: */
1758 /*
1759 * Local Variables:
1760 * mode: c
1761 * c-basic-offset: 8
1762 * fill-column: 78
1763 * End:
1764 */