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[reactos.git] / reactos / dll / 3rdparty / libtiff / tif_luv.c
1 /* $Id: tif_luv.c,v 1.35 2011-04-02 20:54:09 bfriesen 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 user_datafmt; /* user data format */
163 int encode_meth; /* encoding method */
164 int pixel_size; /* bytes per pixel */
165
166 uint8* tbuf; /* translation buffer */
167 tmsize_t tbuflen; /* buffer length */
168 void (*tfunc)(LogLuvState*, uint8*, tmsize_t);
169
170 TIFFVSetMethod vgetparent; /* super-class method */
171 TIFFVSetMethod vsetparent; /* super-class method */
172 };
173
174 #define DecoderState(tif) ((LogLuvState*) (tif)->tif_data)
175 #define EncoderState(tif) ((LogLuvState*) (tif)->tif_data)
176
177 #define SGILOGDATAFMT_UNKNOWN -1
178
179 #define MINRUN 4 /* minimum run length */
180
181 /*
182 * Decode a string of 16-bit gray pixels.
183 */
184 static int
185 LogL16Decode(TIFF* tif, uint8* op, tmsize_t occ, uint16 s)
186 {
187 static const char module[] = "LogL16Decode";
188 LogLuvState* sp = DecoderState(tif);
189 int shft;
190 tmsize_t i;
191 tmsize_t npixels;
192 unsigned char* bp;
193 int16* tp;
194 int16 b;
195 tmsize_t cc;
196 int rc;
197
198 assert(s == 0);
199 assert(sp != NULL);
200
201 npixels = occ / sp->pixel_size;
202
203 if (sp->user_datafmt == SGILOGDATAFMT_16BIT)
204 tp = (int16*) op;
205 else {
206 assert(sp->tbuflen >= npixels);
207 tp = (int16*) sp->tbuf;
208 }
209 _TIFFmemset((void*) tp, 0, npixels*sizeof (tp[0]));
210
211 bp = (unsigned char*) tif->tif_rawcp;
212 cc = tif->tif_rawcc;
213 /* get each byte string */
214 for (shft = 2*8; (shft -= 8) >= 0; ) {
215 for (i = 0; i < npixels && cc > 0; )
216 if (*bp >= 128) { /* run */
217 rc = *bp++ + (2-128); /* TODO: potential input buffer overrun when decoding corrupt or truncated data */
218 b = (int16)(*bp++ << shft);
219 cc -= 2;
220 while (rc-- && i < npixels)
221 tp[i++] |= b;
222 } else { /* non-run */
223 rc = *bp++; /* nul is noop */
224 while (--cc && rc-- && i < npixels)
225 tp[i++] |= (int16)*bp++ << shft;
226 }
227 if (i != npixels) {
228 #if defined(__WIN32__) && (defined(_MSC_VER) || defined(__MINGW32__))
229 TIFFErrorExt(tif->tif_clientdata, module,
230 "Not enough data at row %lu (short %I64d pixels)",
231 (unsigned long) tif->tif_row,
232 (unsigned __int64) (npixels - i));
233 #else
234 TIFFErrorExt(tif->tif_clientdata, module,
235 "Not enough data at row %lu (short %llu pixels)",
236 (unsigned long) tif->tif_row,
237 (unsigned long long) (npixels - i));
238 #endif
239 tif->tif_rawcp = (uint8*) bp;
240 tif->tif_rawcc = cc;
241 return (0);
242 }
243 }
244 (*sp->tfunc)(sp, op, npixels);
245 tif->tif_rawcp = (uint8*) bp;
246 tif->tif_rawcc = cc;
247 return (1);
248 }
249
250 /*
251 * Decode a string of 24-bit pixels.
252 */
253 static int
254 LogLuvDecode24(TIFF* tif, uint8* op, tmsize_t occ, uint16 s)
255 {
256 static const char module[] = "LogLuvDecode24";
257 LogLuvState* sp = DecoderState(tif);
258 tmsize_t cc;
259 tmsize_t i;
260 tmsize_t npixels;
261 unsigned char* bp;
262 uint32* tp;
263
264 assert(s == 0);
265 assert(sp != NULL);
266
267 npixels = occ / sp->pixel_size;
268
269 if (sp->user_datafmt == SGILOGDATAFMT_RAW)
270 tp = (uint32 *)op;
271 else {
272 assert(sp->tbuflen >= npixels);
273 tp = (uint32 *) sp->tbuf;
274 }
275 /* copy to array of uint32 */
276 bp = (unsigned char*) tif->tif_rawcp;
277 cc = tif->tif_rawcc;
278 for (i = 0; i < npixels && cc > 0; i++) {
279 tp[i] = bp[0] << 16 | bp[1] << 8 | bp[2];
280 bp += 3;
281 cc -= 3;
282 }
283 tif->tif_rawcp = (uint8*) bp;
284 tif->tif_rawcc = cc;
285 if (i != npixels) {
286 #if defined(__WIN32__) && (defined(_MSC_VER) || defined(__MINGW32__))
287 TIFFErrorExt(tif->tif_clientdata, module,
288 "Not enough data at row %lu (short %I64d pixels)",
289 (unsigned long) tif->tif_row,
290 (unsigned __int64) (npixels - i));
291 #else
292 TIFFErrorExt(tif->tif_clientdata, module,
293 "Not enough data at row %lu (short %llu pixels)",
294 (unsigned long) tif->tif_row,
295 (unsigned long long) (npixels - i));
296 #endif
297 return (0);
298 }
299 (*sp->tfunc)(sp, op, npixels);
300 return (1);
301 }
302
303 /*
304 * Decode a string of 32-bit pixels.
305 */
306 static int
307 LogLuvDecode32(TIFF* tif, uint8* op, tmsize_t occ, uint16 s)
308 {
309 static const char module[] = "LogLuvDecode32";
310 LogLuvState* sp;
311 int shft;
312 tmsize_t i;
313 tmsize_t npixels;
314 unsigned char* bp;
315 uint32* tp;
316 uint32 b;
317 tmsize_t cc;
318 int rc;
319
320 assert(s == 0);
321 sp = DecoderState(tif);
322 assert(sp != NULL);
323
324 npixels = occ / sp->pixel_size;
325
326 if (sp->user_datafmt == SGILOGDATAFMT_RAW)
327 tp = (uint32*) op;
328 else {
329 assert(sp->tbuflen >= npixels);
330 tp = (uint32*) sp->tbuf;
331 }
332 _TIFFmemset((void*) tp, 0, npixels*sizeof (tp[0]));
333
334 bp = (unsigned char*) tif->tif_rawcp;
335 cc = tif->tif_rawcc;
336 /* get each byte string */
337 for (shft = 4*8; (shft -= 8) >= 0; ) {
338 for (i = 0; i < npixels && cc > 0; )
339 if (*bp >= 128) { /* run */
340 rc = *bp++ + (2-128);
341 b = (uint32)*bp++ << shft;
342 cc -= 2; /* TODO: potential input buffer overrun when decoding corrupt or truncated data */
343 while (rc-- && i < npixels)
344 tp[i++] |= b;
345 } else { /* non-run */
346 rc = *bp++; /* nul is noop */
347 while (--cc && rc-- && i < npixels)
348 tp[i++] |= (uint32)*bp++ << shft;
349 }
350 if (i != npixels) {
351 #if defined(__WIN32__) && (defined(_MSC_VER) || defined(__MINGW32__))
352 TIFFErrorExt(tif->tif_clientdata, module,
353 "Not enough data at row %lu (short %I64d pixels)",
354 (unsigned long) tif->tif_row,
355 (unsigned __int64) (npixels - i));
356 #else
357 TIFFErrorExt(tif->tif_clientdata, module,
358 "Not enough data at row %lu (short %llu pixels)",
359 (unsigned long) tif->tif_row,
360 (unsigned long long) (npixels - i));
361 #endif
362 tif->tif_rawcp = (uint8*) bp;
363 tif->tif_rawcc = cc;
364 return (0);
365 }
366 }
367 (*sp->tfunc)(sp, op, npixels);
368 tif->tif_rawcp = (uint8*) bp;
369 tif->tif_rawcc = cc;
370 return (1);
371 }
372
373 /*
374 * Decode a strip of pixels. We break it into rows to
375 * maintain synchrony with the encode algorithm, which
376 * is row by row.
377 */
378 static int
379 LogLuvDecodeStrip(TIFF* tif, uint8* bp, tmsize_t cc, uint16 s)
380 {
381 tmsize_t rowlen = TIFFScanlineSize(tif);
382
383 assert(cc%rowlen == 0);
384 while (cc && (*tif->tif_decoderow)(tif, bp, rowlen, s))
385 bp += rowlen, cc -= rowlen;
386 return (cc == 0);
387 }
388
389 /*
390 * Decode a tile of pixels. We break it into rows to
391 * maintain synchrony with the encode algorithm, which
392 * is row by row.
393 */
394 static int
395 LogLuvDecodeTile(TIFF* tif, uint8* bp, tmsize_t cc, uint16 s)
396 {
397 tmsize_t rowlen = TIFFTileRowSize(tif);
398
399 assert(cc%rowlen == 0);
400 while (cc && (*tif->tif_decoderow)(tif, bp, rowlen, s))
401 bp += rowlen, cc -= rowlen;
402 return (cc == 0);
403 }
404
405 /*
406 * Encode a row of 16-bit pixels.
407 */
408 static int
409 LogL16Encode(TIFF* tif, uint8* bp, tmsize_t cc, uint16 s)
410 {
411 LogLuvState* sp = EncoderState(tif);
412 int shft;
413 tmsize_t i;
414 tmsize_t j;
415 tmsize_t npixels;
416 uint8* op;
417 int16* tp;
418 int16 b;
419 tmsize_t occ;
420 int rc=0, mask;
421 tmsize_t beg;
422
423 assert(s == 0);
424 assert(sp != NULL);
425 npixels = cc / sp->pixel_size;
426
427 if (sp->user_datafmt == SGILOGDATAFMT_16BIT)
428 tp = (int16*) bp;
429 else {
430 tp = (int16*) sp->tbuf;
431 assert(sp->tbuflen >= npixels);
432 (*sp->tfunc)(sp, bp, npixels);
433 }
434 /* compress each byte string */
435 op = tif->tif_rawcp;
436 occ = tif->tif_rawdatasize - tif->tif_rawcc;
437 for (shft = 2*8; (shft -= 8) >= 0; )
438 for (i = 0; i < npixels; i += rc) {
439 if (occ < 4) {
440 tif->tif_rawcp = op;
441 tif->tif_rawcc = tif->tif_rawdatasize - occ;
442 if (!TIFFFlushData1(tif))
443 return (-1);
444 op = tif->tif_rawcp;
445 occ = tif->tif_rawdatasize - tif->tif_rawcc;
446 }
447 mask = 0xff << shft; /* find next run */
448 for (beg = i; beg < npixels; beg += rc) {
449 b = (int16) (tp[beg] & mask);
450 rc = 1;
451 while (rc < 127+2 && beg+rc < npixels &&
452 (tp[beg+rc] & mask) == b)
453 rc++;
454 if (rc >= MINRUN)
455 break; /* long enough */
456 }
457 if (beg-i > 1 && beg-i < MINRUN) {
458 b = (int16) (tp[i] & mask);/*check short run */
459 j = i+1;
460 while ((tp[j++] & mask) == b)
461 if (j == beg) {
462 *op++ = (uint8)(128-2+j-i);
463 *op++ = (uint8)(b >> shft);
464 occ -= 2;
465 i = beg;
466 break;
467 }
468 }
469 while (i < beg) { /* write out non-run */
470 if ((j = beg-i) > 127) j = 127;
471 if (occ < j+3) {
472 tif->tif_rawcp = op;
473 tif->tif_rawcc = tif->tif_rawdatasize - occ;
474 if (!TIFFFlushData1(tif))
475 return (-1);
476 op = tif->tif_rawcp;
477 occ = tif->tif_rawdatasize - tif->tif_rawcc;
478 }
479 *op++ = (uint8) j; occ--;
480 while (j--) {
481 *op++ = (uint8) (tp[i++] >> shft & 0xff);
482 occ--;
483 }
484 }
485 if (rc >= MINRUN) { /* write out run */
486 *op++ = (uint8) (128-2+rc);
487 *op++ = (uint8) (tp[beg] >> shft & 0xff);
488 occ -= 2;
489 } else
490 rc = 0;
491 }
492 tif->tif_rawcp = op;
493 tif->tif_rawcc = tif->tif_rawdatasize - occ;
494
495 return (1);
496 }
497
498 /*
499 * Encode a row of 24-bit pixels.
500 */
501 static int
502 LogLuvEncode24(TIFF* tif, uint8* bp, tmsize_t cc, uint16 s)
503 {
504 LogLuvState* sp = EncoderState(tif);
505 tmsize_t i;
506 tmsize_t npixels;
507 tmsize_t occ;
508 uint8* op;
509 uint32* tp;
510
511 assert(s == 0);
512 assert(sp != NULL);
513 npixels = cc / sp->pixel_size;
514
515 if (sp->user_datafmt == SGILOGDATAFMT_RAW)
516 tp = (uint32*) bp;
517 else {
518 tp = (uint32*) sp->tbuf;
519 assert(sp->tbuflen >= npixels);
520 (*sp->tfunc)(sp, bp, npixels);
521 }
522 /* write out encoded pixels */
523 op = tif->tif_rawcp;
524 occ = tif->tif_rawdatasize - tif->tif_rawcc;
525 for (i = npixels; i--; ) {
526 if (occ < 3) {
527 tif->tif_rawcp = op;
528 tif->tif_rawcc = tif->tif_rawdatasize - occ;
529 if (!TIFFFlushData1(tif))
530 return (-1);
531 op = tif->tif_rawcp;
532 occ = tif->tif_rawdatasize - tif->tif_rawcc;
533 }
534 *op++ = (uint8)(*tp >> 16);
535 *op++ = (uint8)(*tp >> 8 & 0xff);
536 *op++ = (uint8)(*tp++ & 0xff);
537 occ -= 3;
538 }
539 tif->tif_rawcp = op;
540 tif->tif_rawcc = tif->tif_rawdatasize - occ;
541
542 return (1);
543 }
544
545 /*
546 * Encode a row of 32-bit pixels.
547 */
548 static int
549 LogLuvEncode32(TIFF* tif, uint8* bp, tmsize_t cc, uint16 s)
550 {
551 LogLuvState* sp = EncoderState(tif);
552 int shft;
553 tmsize_t i;
554 tmsize_t j;
555 tmsize_t npixels;
556 uint8* op;
557 uint32* tp;
558 uint32 b;
559 tmsize_t occ;
560 int rc=0, mask;
561 tmsize_t beg;
562
563 assert(s == 0);
564 assert(sp != NULL);
565
566 npixels = cc / sp->pixel_size;
567
568 if (sp->user_datafmt == SGILOGDATAFMT_RAW)
569 tp = (uint32*) bp;
570 else {
571 tp = (uint32*) sp->tbuf;
572 assert(sp->tbuflen >= npixels);
573 (*sp->tfunc)(sp, bp, npixels);
574 }
575 /* compress each byte string */
576 op = tif->tif_rawcp;
577 occ = tif->tif_rawdatasize - tif->tif_rawcc;
578 for (shft = 4*8; (shft -= 8) >= 0; )
579 for (i = 0; i < npixels; i += rc) {
580 if (occ < 4) {
581 tif->tif_rawcp = op;
582 tif->tif_rawcc = tif->tif_rawdatasize - occ;
583 if (!TIFFFlushData1(tif))
584 return (-1);
585 op = tif->tif_rawcp;
586 occ = tif->tif_rawdatasize - tif->tif_rawcc;
587 }
588 mask = 0xff << shft; /* find next run */
589 for (beg = i; beg < npixels; beg += rc) {
590 b = tp[beg] & mask;
591 rc = 1;
592 while (rc < 127+2 && beg+rc < npixels &&
593 (tp[beg+rc] & mask) == b)
594 rc++;
595 if (rc >= MINRUN)
596 break; /* long enough */
597 }
598 if (beg-i > 1 && beg-i < MINRUN) {
599 b = tp[i] & mask; /* check short run */
600 j = i+1;
601 while ((tp[j++] & mask) == b)
602 if (j == beg) {
603 *op++ = (uint8)(128-2+j-i);
604 *op++ = (uint8)(b >> shft);
605 occ -= 2;
606 i = beg;
607 break;
608 }
609 }
610 while (i < beg) { /* write out non-run */
611 if ((j = beg-i) > 127) j = 127;
612 if (occ < j+3) {
613 tif->tif_rawcp = op;
614 tif->tif_rawcc = tif->tif_rawdatasize - occ;
615 if (!TIFFFlushData1(tif))
616 return (-1);
617 op = tif->tif_rawcp;
618 occ = tif->tif_rawdatasize - tif->tif_rawcc;
619 }
620 *op++ = (uint8) j; occ--;
621 while (j--) {
622 *op++ = (uint8)(tp[i++] >> shft & 0xff);
623 occ--;
624 }
625 }
626 if (rc >= MINRUN) { /* write out run */
627 *op++ = (uint8) (128-2+rc);
628 *op++ = (uint8)(tp[beg] >> shft & 0xff);
629 occ -= 2;
630 } else
631 rc = 0;
632 }
633 tif->tif_rawcp = op;
634 tif->tif_rawcc = tif->tif_rawdatasize - occ;
635
636 return (1);
637 }
638
639 /*
640 * Encode a strip of pixels. We break it into rows to
641 * avoid encoding runs across row boundaries.
642 */
643 static int
644 LogLuvEncodeStrip(TIFF* tif, uint8* bp, tmsize_t cc, uint16 s)
645 {
646 tmsize_t rowlen = TIFFScanlineSize(tif);
647
648 assert(cc%rowlen == 0);
649 while (cc && (*tif->tif_encoderow)(tif, bp, rowlen, s) == 1)
650 bp += rowlen, cc -= rowlen;
651 return (cc == 0);
652 }
653
654 /*
655 * Encode a tile of pixels. We break it into rows to
656 * avoid encoding runs across row boundaries.
657 */
658 static int
659 LogLuvEncodeTile(TIFF* tif, uint8* bp, tmsize_t cc, uint16 s)
660 {
661 tmsize_t rowlen = TIFFTileRowSize(tif);
662
663 assert(cc%rowlen == 0);
664 while (cc && (*tif->tif_encoderow)(tif, bp, rowlen, s) == 1)
665 bp += rowlen, cc -= rowlen;
666 return (cc == 0);
667 }
668
669 /*
670 * Encode/Decode functions for converting to and from user formats.
671 */
672
673 #include "uvcode.h"
674
675 #ifndef UVSCALE
676 #define U_NEU 0.210526316
677 #define V_NEU 0.473684211
678 #define UVSCALE 410.
679 #endif
680
681 #ifndef M_LN2
682 #define M_LN2 0.69314718055994530942
683 #endif
684 #ifndef M_PI
685 #define M_PI 3.14159265358979323846
686 #endif
687 #define log2(x) ((1./M_LN2)*log(x))
688 #define exp2(x) exp(M_LN2*(x))
689
690 #define itrunc(x,m) ((m)==SGILOGENCODE_NODITHER ? \
691 (int)(x) : \
692 (int)((x) + rand()*(1./RAND_MAX) - .5))
693
694 #if !LOGLUV_PUBLIC
695 static
696 #endif
697 double
698 LogL16toY(int p16) /* compute luminance from 16-bit LogL */
699 {
700 int Le = p16 & 0x7fff;
701 double Y;
702
703 if (!Le)
704 return (0.);
705 Y = exp(M_LN2/256.*(Le+.5) - M_LN2*64.);
706 return (!(p16 & 0x8000) ? Y : -Y);
707 }
708
709 #if !LOGLUV_PUBLIC
710 static
711 #endif
712 int
713 LogL16fromY(double Y, int em) /* get 16-bit LogL from Y */
714 {
715 if (Y >= 1.8371976e19)
716 return (0x7fff);
717 if (Y <= -1.8371976e19)
718 return (0xffff);
719 if (Y > 5.4136769e-20)
720 return itrunc(256.*(log2(Y) + 64.), em);
721 if (Y < -5.4136769e-20)
722 return (~0x7fff | itrunc(256.*(log2(-Y) + 64.), em));
723 return (0);
724 }
725
726 static void
727 L16toY(LogLuvState* sp, uint8* op, tmsize_t n)
728 {
729 int16* l16 = (int16*) sp->tbuf;
730 float* yp = (float*) op;
731
732 while (n-- > 0)
733 *yp++ = (float)LogL16toY(*l16++);
734 }
735
736 static void
737 L16toGry(LogLuvState* sp, uint8* op, tmsize_t n)
738 {
739 int16* l16 = (int16*) sp->tbuf;
740 uint8* gp = (uint8*) op;
741
742 while (n-- > 0) {
743 double Y = LogL16toY(*l16++);
744 *gp++ = (uint8) ((Y <= 0.) ? 0 : (Y >= 1.) ? 255 : (int)(256.*sqrt(Y)));
745 }
746 }
747
748 static void
749 L16fromY(LogLuvState* sp, uint8* op, tmsize_t n)
750 {
751 int16* l16 = (int16*) sp->tbuf;
752 float* yp = (float*) op;
753
754 while (n-- > 0)
755 *l16++ = (int16) (LogL16fromY(*yp++, sp->encode_meth));
756 }
757
758 #if !LOGLUV_PUBLIC
759 static
760 #endif
761 void
762 XYZtoRGB24(float xyz[3], uint8 rgb[3])
763 {
764 double r, g, b;
765 /* assume CCIR-709 primaries */
766 r = 2.690*xyz[0] + -1.276*xyz[1] + -0.414*xyz[2];
767 g = -1.022*xyz[0] + 1.978*xyz[1] + 0.044*xyz[2];
768 b = 0.061*xyz[0] + -0.224*xyz[1] + 1.163*xyz[2];
769 /* assume 2.0 gamma for speed */
770 /* could use integer sqrt approx., but this is probably faster */
771 rgb[0] = (uint8)((r<=0.) ? 0 : (r >= 1.) ? 255 : (int)(256.*sqrt(r)));
772 rgb[1] = (uint8)((g<=0.) ? 0 : (g >= 1.) ? 255 : (int)(256.*sqrt(g)));
773 rgb[2] = (uint8)((b<=0.) ? 0 : (b >= 1.) ? 255 : (int)(256.*sqrt(b)));
774 }
775
776 #if !LOGLUV_PUBLIC
777 static
778 #endif
779 double
780 LogL10toY(int p10) /* compute luminance from 10-bit LogL */
781 {
782 if (p10 == 0)
783 return (0.);
784 return (exp(M_LN2/64.*(p10+.5) - M_LN2*12.));
785 }
786
787 #if !LOGLUV_PUBLIC
788 static
789 #endif
790 int
791 LogL10fromY(double Y, int em) /* get 10-bit LogL from Y */
792 {
793 if (Y >= 15.742)
794 return (0x3ff);
795 else if (Y <= .00024283)
796 return (0);
797 else
798 return itrunc(64.*(log2(Y) + 12.), em);
799 }
800
801 #define NANGLES 100
802 #define uv2ang(u, v) ( (NANGLES*.499999999/M_PI) \
803 * atan2((v)-V_NEU,(u)-U_NEU) + .5*NANGLES )
804
805 static int
806 oog_encode(double u, double v) /* encode out-of-gamut chroma */
807 {
808 static int oog_table[NANGLES];
809 static int initialized = 0;
810 register int i;
811
812 if (!initialized) { /* set up perimeter table */
813 double eps[NANGLES], ua, va, ang, epsa;
814 int ui, vi, ustep;
815 for (i = NANGLES; i--; )
816 eps[i] = 2.;
817 for (vi = UV_NVS; vi--; ) {
818 va = UV_VSTART + (vi+.5)*UV_SQSIZ;
819 ustep = uv_row[vi].nus-1;
820 if (vi == UV_NVS-1 || vi == 0 || ustep <= 0)
821 ustep = 1;
822 for (ui = uv_row[vi].nus-1; ui >= 0; ui -= ustep) {
823 ua = uv_row[vi].ustart + (ui+.5)*UV_SQSIZ;
824 ang = uv2ang(ua, va);
825 i = (int) ang;
826 epsa = fabs(ang - (i+.5));
827 if (epsa < eps[i]) {
828 oog_table[i] = uv_row[vi].ncum + ui;
829 eps[i] = epsa;
830 }
831 }
832 }
833 for (i = NANGLES; i--; ) /* fill any holes */
834 if (eps[i] > 1.5) {
835 int i1, i2;
836 for (i1 = 1; i1 < NANGLES/2; i1++)
837 if (eps[(i+i1)%NANGLES] < 1.5)
838 break;
839 for (i2 = 1; i2 < NANGLES/2; i2++)
840 if (eps[(i+NANGLES-i2)%NANGLES] < 1.5)
841 break;
842 if (i1 < i2)
843 oog_table[i] =
844 oog_table[(i+i1)%NANGLES];
845 else
846 oog_table[i] =
847 oog_table[(i+NANGLES-i2)%NANGLES];
848 }
849 initialized = 1;
850 }
851 i = (int) uv2ang(u, v); /* look up hue angle */
852 return (oog_table[i]);
853 }
854
855 #undef uv2ang
856 #undef NANGLES
857
858 #if !LOGLUV_PUBLIC
859 static
860 #endif
861 int
862 uv_encode(double u, double v, int em) /* encode (u',v') coordinates */
863 {
864 register int vi, ui;
865
866 if (v < UV_VSTART)
867 return oog_encode(u, v);
868 vi = itrunc((v - UV_VSTART)*(1./UV_SQSIZ), em);
869 if (vi >= UV_NVS)
870 return oog_encode(u, v);
871 if (u < uv_row[vi].ustart)
872 return oog_encode(u, v);
873 ui = itrunc((u - uv_row[vi].ustart)*(1./UV_SQSIZ), em);
874 if (ui >= uv_row[vi].nus)
875 return oog_encode(u, v);
876
877 return (uv_row[vi].ncum + ui);
878 }
879
880 #if !LOGLUV_PUBLIC
881 static
882 #endif
883 int
884 uv_decode(double *up, double *vp, int c) /* decode (u',v') index */
885 {
886 int upper, lower;
887 register int ui, vi;
888
889 if (c < 0 || c >= UV_NDIVS)
890 return (-1);
891 lower = 0; /* binary search */
892 upper = UV_NVS;
893 while (upper - lower > 1) {
894 vi = (lower + upper) >> 1;
895 ui = c - uv_row[vi].ncum;
896 if (ui > 0)
897 lower = vi;
898 else if (ui < 0)
899 upper = vi;
900 else {
901 lower = vi;
902 break;
903 }
904 }
905 vi = lower;
906 ui = c - uv_row[vi].ncum;
907 *up = uv_row[vi].ustart + (ui+.5)*UV_SQSIZ;
908 *vp = UV_VSTART + (vi+.5)*UV_SQSIZ;
909 return (0);
910 }
911
912 #if !LOGLUV_PUBLIC
913 static
914 #endif
915 void
916 LogLuv24toXYZ(uint32 p, float XYZ[3])
917 {
918 int Ce;
919 double L, u, v, s, x, y;
920 /* decode luminance */
921 L = LogL10toY(p>>14 & 0x3ff);
922 if (L <= 0.) {
923 XYZ[0] = XYZ[1] = XYZ[2] = 0.;
924 return;
925 }
926 /* decode color */
927 Ce = p & 0x3fff;
928 if (uv_decode(&u, &v, Ce) < 0) {
929 u = U_NEU; v = V_NEU;
930 }
931 s = 1./(6.*u - 16.*v + 12.);
932 x = 9.*u * s;
933 y = 4.*v * s;
934 /* convert to XYZ */
935 XYZ[0] = (float)(x/y * L);
936 XYZ[1] = (float)L;
937 XYZ[2] = (float)((1.-x-y)/y * L);
938 }
939
940 #if !LOGLUV_PUBLIC
941 static
942 #endif
943 uint32
944 LogLuv24fromXYZ(float XYZ[3], int em)
945 {
946 int Le, Ce;
947 double u, v, s;
948 /* encode luminance */
949 Le = LogL10fromY(XYZ[1], em);
950 /* encode color */
951 s = XYZ[0] + 15.*XYZ[1] + 3.*XYZ[2];
952 if (!Le || s <= 0.) {
953 u = U_NEU;
954 v = V_NEU;
955 } else {
956 u = 4.*XYZ[0] / s;
957 v = 9.*XYZ[1] / s;
958 }
959 Ce = uv_encode(u, v, em);
960 if (Ce < 0) /* never happens */
961 Ce = uv_encode(U_NEU, V_NEU, SGILOGENCODE_NODITHER);
962 /* combine encodings */
963 return (Le << 14 | Ce);
964 }
965
966 static void
967 Luv24toXYZ(LogLuvState* sp, uint8* op, tmsize_t n)
968 {
969 uint32* luv = (uint32*) sp->tbuf;
970 float* xyz = (float*) op;
971
972 while (n-- > 0) {
973 LogLuv24toXYZ(*luv, xyz);
974 xyz += 3;
975 luv++;
976 }
977 }
978
979 static void
980 Luv24toLuv48(LogLuvState* sp, uint8* op, tmsize_t n)
981 {
982 uint32* luv = (uint32*) sp->tbuf;
983 int16* luv3 = (int16*) op;
984
985 while (n-- > 0) {
986 double u, v;
987
988 *luv3++ = (int16)((*luv >> 12 & 0xffd) + 13314);
989 if (uv_decode(&u, &v, *luv&0x3fff) < 0) {
990 u = U_NEU;
991 v = V_NEU;
992 }
993 *luv3++ = (int16)(u * (1L<<15));
994 *luv3++ = (int16)(v * (1L<<15));
995 luv++;
996 }
997 }
998
999 static void
1000 Luv24toRGB(LogLuvState* sp, uint8* op, tmsize_t n)
1001 {
1002 uint32* luv = (uint32*) sp->tbuf;
1003 uint8* rgb = (uint8*) op;
1004
1005 while (n-- > 0) {
1006 float xyz[3];
1007
1008 LogLuv24toXYZ(*luv++, xyz);
1009 XYZtoRGB24(xyz, rgb);
1010 rgb += 3;
1011 }
1012 }
1013
1014 static void
1015 Luv24fromXYZ(LogLuvState* sp, uint8* op, tmsize_t n)
1016 {
1017 uint32* luv = (uint32*) sp->tbuf;
1018 float* xyz = (float*) op;
1019
1020 while (n-- > 0) {
1021 *luv++ = LogLuv24fromXYZ(xyz, sp->encode_meth);
1022 xyz += 3;
1023 }
1024 }
1025
1026 static void
1027 Luv24fromLuv48(LogLuvState* sp, uint8* op, tmsize_t n)
1028 {
1029 uint32* luv = (uint32*) sp->tbuf;
1030 int16* luv3 = (int16*) op;
1031
1032 while (n-- > 0) {
1033 int Le, Ce;
1034
1035 if (luv3[0] <= 0)
1036 Le = 0;
1037 else if (luv3[0] >= (1<<12)+3314)
1038 Le = (1<<10) - 1;
1039 else if (sp->encode_meth == SGILOGENCODE_NODITHER)
1040 Le = (luv3[0]-3314) >> 2;
1041 else
1042 Le = itrunc(.25*(luv3[0]-3314.), sp->encode_meth);
1043
1044 Ce = uv_encode((luv3[1]+.5)/(1<<15), (luv3[2]+.5)/(1<<15),
1045 sp->encode_meth);
1046 if (Ce < 0) /* never happens */
1047 Ce = uv_encode(U_NEU, V_NEU, SGILOGENCODE_NODITHER);
1048 *luv++ = (uint32)Le << 14 | Ce;
1049 luv3 += 3;
1050 }
1051 }
1052
1053 #if !LOGLUV_PUBLIC
1054 static
1055 #endif
1056 void
1057 LogLuv32toXYZ(uint32 p, float XYZ[3])
1058 {
1059 double L, u, v, s, x, y;
1060 /* decode luminance */
1061 L = LogL16toY((int)p >> 16);
1062 if (L <= 0.) {
1063 XYZ[0] = XYZ[1] = XYZ[2] = 0.;
1064 return;
1065 }
1066 /* decode color */
1067 u = 1./UVSCALE * ((p>>8 & 0xff) + .5);
1068 v = 1./UVSCALE * ((p & 0xff) + .5);
1069 s = 1./(6.*u - 16.*v + 12.);
1070 x = 9.*u * s;
1071 y = 4.*v * s;
1072 /* convert to XYZ */
1073 XYZ[0] = (float)(x/y * L);
1074 XYZ[1] = (float)L;
1075 XYZ[2] = (float)((1.-x-y)/y * L);
1076 }
1077
1078 #if !LOGLUV_PUBLIC
1079 static
1080 #endif
1081 uint32
1082 LogLuv32fromXYZ(float XYZ[3], int em)
1083 {
1084 unsigned int Le, ue, ve;
1085 double u, v, s;
1086 /* encode luminance */
1087 Le = (unsigned int)LogL16fromY(XYZ[1], em);
1088 /* encode color */
1089 s = XYZ[0] + 15.*XYZ[1] + 3.*XYZ[2];
1090 if (!Le || s <= 0.) {
1091 u = U_NEU;
1092 v = V_NEU;
1093 } else {
1094 u = 4.*XYZ[0] / s;
1095 v = 9.*XYZ[1] / s;
1096 }
1097 if (u <= 0.) ue = 0;
1098 else ue = itrunc(UVSCALE*u, em);
1099 if (ue > 255) ue = 255;
1100 if (v <= 0.) ve = 0;
1101 else ve = itrunc(UVSCALE*v, em);
1102 if (ve > 255) ve = 255;
1103 /* combine encodings */
1104 return (Le << 16 | ue << 8 | ve);
1105 }
1106
1107 static void
1108 Luv32toXYZ(LogLuvState* sp, uint8* op, tmsize_t n)
1109 {
1110 uint32* luv = (uint32*) sp->tbuf;
1111 float* xyz = (float*) op;
1112
1113 while (n-- > 0) {
1114 LogLuv32toXYZ(*luv++, xyz);
1115 xyz += 3;
1116 }
1117 }
1118
1119 static void
1120 Luv32toLuv48(LogLuvState* sp, uint8* op, tmsize_t n)
1121 {
1122 uint32* luv = (uint32*) sp->tbuf;
1123 int16* luv3 = (int16*) op;
1124
1125 while (n-- > 0) {
1126 double u, v;
1127
1128 *luv3++ = (int16)(*luv >> 16);
1129 u = 1./UVSCALE * ((*luv>>8 & 0xff) + .5);
1130 v = 1./UVSCALE * ((*luv & 0xff) + .5);
1131 *luv3++ = (int16)(u * (1L<<15));
1132 *luv3++ = (int16)(v * (1L<<15));
1133 luv++;
1134 }
1135 }
1136
1137 static void
1138 Luv32toRGB(LogLuvState* sp, uint8* op, tmsize_t n)
1139 {
1140 uint32* luv = (uint32*) sp->tbuf;
1141 uint8* rgb = (uint8*) op;
1142
1143 while (n-- > 0) {
1144 float xyz[3];
1145
1146 LogLuv32toXYZ(*luv++, xyz);
1147 XYZtoRGB24(xyz, rgb);
1148 rgb += 3;
1149 }
1150 }
1151
1152 static void
1153 Luv32fromXYZ(LogLuvState* sp, uint8* op, tmsize_t n)
1154 {
1155 uint32* luv = (uint32*) sp->tbuf;
1156 float* xyz = (float*) op;
1157
1158 while (n-- > 0) {
1159 *luv++ = LogLuv32fromXYZ(xyz, sp->encode_meth);
1160 xyz += 3;
1161 }
1162 }
1163
1164 static void
1165 Luv32fromLuv48(LogLuvState* sp, uint8* op, tmsize_t n)
1166 {
1167 uint32* luv = (uint32*) sp->tbuf;
1168 int16* luv3 = (int16*) op;
1169
1170 if (sp->encode_meth == SGILOGENCODE_NODITHER) {
1171 while (n-- > 0) {
1172 *luv++ = (uint32)luv3[0] << 16 |
1173 (luv3[1]*(uint32)(UVSCALE+.5) >> 7 & 0xff00) |
1174 (luv3[2]*(uint32)(UVSCALE+.5) >> 15 & 0xff);
1175 luv3 += 3;
1176 }
1177 return;
1178 }
1179 while (n-- > 0) {
1180 *luv++ = (uint32)luv3[0] << 16 |
1181 (itrunc(luv3[1]*(UVSCALE/(1<<15)), sp->encode_meth) << 8 & 0xff00) |
1182 (itrunc(luv3[2]*(UVSCALE/(1<<15)), sp->encode_meth) & 0xff);
1183 luv3 += 3;
1184 }
1185 }
1186
1187 static void
1188 _logLuvNop(LogLuvState* sp, uint8* op, tmsize_t n)
1189 {
1190 (void) sp; (void) op; (void) n;
1191 }
1192
1193 static int
1194 LogL16GuessDataFmt(TIFFDirectory *td)
1195 {
1196 #define PACK(s,b,f) (((b)<<6)|((s)<<3)|(f))
1197 switch (PACK(td->td_samplesperpixel, td->td_bitspersample, td->td_sampleformat)) {
1198 case PACK(1, 32, SAMPLEFORMAT_IEEEFP):
1199 return (SGILOGDATAFMT_FLOAT);
1200 case PACK(1, 16, SAMPLEFORMAT_VOID):
1201 case PACK(1, 16, SAMPLEFORMAT_INT):
1202 case PACK(1, 16, SAMPLEFORMAT_UINT):
1203 return (SGILOGDATAFMT_16BIT);
1204 case PACK(1, 8, SAMPLEFORMAT_VOID):
1205 case PACK(1, 8, SAMPLEFORMAT_UINT):
1206 return (SGILOGDATAFMT_8BIT);
1207 }
1208 #undef PACK
1209 return (SGILOGDATAFMT_UNKNOWN);
1210 }
1211
1212 static tmsize_t
1213 multiply_ms(tmsize_t m1, tmsize_t m2)
1214 {
1215 tmsize_t bytes = m1 * m2;
1216
1217 if (m1 && bytes / m1 != m2)
1218 bytes = 0;
1219
1220 return bytes;
1221 }
1222
1223 static int
1224 LogL16InitState(TIFF* tif)
1225 {
1226 static const char module[] = "LogL16InitState";
1227 TIFFDirectory *td = &tif->tif_dir;
1228 LogLuvState* sp = DecoderState(tif);
1229
1230 assert(sp != NULL);
1231 assert(td->td_photometric == PHOTOMETRIC_LOGL);
1232
1233 /* for some reason, we can't do this in TIFFInitLogL16 */
1234 if (sp->user_datafmt == SGILOGDATAFMT_UNKNOWN)
1235 sp->user_datafmt = LogL16GuessDataFmt(td);
1236 switch (sp->user_datafmt) {
1237 case SGILOGDATAFMT_FLOAT:
1238 sp->pixel_size = sizeof (float);
1239 break;
1240 case SGILOGDATAFMT_16BIT:
1241 sp->pixel_size = sizeof (int16);
1242 break;
1243 case SGILOGDATAFMT_8BIT:
1244 sp->pixel_size = sizeof (uint8);
1245 break;
1246 default:
1247 TIFFErrorExt(tif->tif_clientdata, module,
1248 "No support for converting user data format to LogL");
1249 return (0);
1250 }
1251 if( isTiled(tif) )
1252 sp->tbuflen = multiply_ms(td->td_tilewidth, td->td_tilelength);
1253 else
1254 sp->tbuflen = multiply_ms(td->td_imagewidth, td->td_rowsperstrip);
1255 if (multiply_ms(sp->tbuflen, sizeof (int16)) == 0 ||
1256 (sp->tbuf = (uint8*) _TIFFmalloc(sp->tbuflen * sizeof (int16))) == NULL) {
1257 TIFFErrorExt(tif->tif_clientdata, module, "No space for SGILog translation buffer");
1258 return (0);
1259 }
1260 return (1);
1261 }
1262
1263 static int
1264 LogLuvGuessDataFmt(TIFFDirectory *td)
1265 {
1266 int guess;
1267
1268 /*
1269 * If the user didn't tell us their datafmt,
1270 * take our best guess from the bitspersample.
1271 */
1272 #define PACK(a,b) (((a)<<3)|(b))
1273 switch (PACK(td->td_bitspersample, td->td_sampleformat)) {
1274 case PACK(32, SAMPLEFORMAT_IEEEFP):
1275 guess = SGILOGDATAFMT_FLOAT;
1276 break;
1277 case PACK(32, SAMPLEFORMAT_VOID):
1278 case PACK(32, SAMPLEFORMAT_UINT):
1279 case PACK(32, SAMPLEFORMAT_INT):
1280 guess = SGILOGDATAFMT_RAW;
1281 break;
1282 case PACK(16, SAMPLEFORMAT_VOID):
1283 case PACK(16, SAMPLEFORMAT_INT):
1284 case PACK(16, SAMPLEFORMAT_UINT):
1285 guess = SGILOGDATAFMT_16BIT;
1286 break;
1287 case PACK( 8, SAMPLEFORMAT_VOID):
1288 case PACK( 8, SAMPLEFORMAT_UINT):
1289 guess = SGILOGDATAFMT_8BIT;
1290 break;
1291 default:
1292 guess = SGILOGDATAFMT_UNKNOWN;
1293 break;
1294 #undef PACK
1295 }
1296 /*
1297 * Double-check samples per pixel.
1298 */
1299 switch (td->td_samplesperpixel) {
1300 case 1:
1301 if (guess != SGILOGDATAFMT_RAW)
1302 guess = SGILOGDATAFMT_UNKNOWN;
1303 break;
1304 case 3:
1305 if (guess == SGILOGDATAFMT_RAW)
1306 guess = SGILOGDATAFMT_UNKNOWN;
1307 break;
1308 default:
1309 guess = SGILOGDATAFMT_UNKNOWN;
1310 break;
1311 }
1312 return (guess);
1313 }
1314
1315 static int
1316 LogLuvInitState(TIFF* tif)
1317 {
1318 static const char module[] = "LogLuvInitState";
1319 TIFFDirectory* td = &tif->tif_dir;
1320 LogLuvState* sp = DecoderState(tif);
1321
1322 assert(sp != NULL);
1323 assert(td->td_photometric == PHOTOMETRIC_LOGLUV);
1324
1325 /* for some reason, we can't do this in TIFFInitLogLuv */
1326 if (td->td_planarconfig != PLANARCONFIG_CONTIG) {
1327 TIFFErrorExt(tif->tif_clientdata, module,
1328 "SGILog compression cannot handle non-contiguous data");
1329 return (0);
1330 }
1331 if (sp->user_datafmt == SGILOGDATAFMT_UNKNOWN)
1332 sp->user_datafmt = LogLuvGuessDataFmt(td);
1333 switch (sp->user_datafmt) {
1334 case SGILOGDATAFMT_FLOAT:
1335 sp->pixel_size = 3*sizeof (float);
1336 break;
1337 case SGILOGDATAFMT_16BIT:
1338 sp->pixel_size = 3*sizeof (int16);
1339 break;
1340 case SGILOGDATAFMT_RAW:
1341 sp->pixel_size = sizeof (uint32);
1342 break;
1343 case SGILOGDATAFMT_8BIT:
1344 sp->pixel_size = 3*sizeof (uint8);
1345 break;
1346 default:
1347 TIFFErrorExt(tif->tif_clientdata, module,
1348 "No support for converting user data format to LogLuv");
1349 return (0);
1350 }
1351 if( isTiled(tif) )
1352 sp->tbuflen = multiply_ms(td->td_tilewidth, td->td_tilelength);
1353 else
1354 sp->tbuflen = multiply_ms(td->td_imagewidth, td->td_rowsperstrip);
1355 if (multiply_ms(sp->tbuflen, sizeof (uint32)) == 0 ||
1356 (sp->tbuf = (uint8*) _TIFFmalloc(sp->tbuflen * sizeof (uint32))) == NULL) {
1357 TIFFErrorExt(tif->tif_clientdata, module, "No space for SGILog translation buffer");
1358 return (0);
1359 }
1360 return (1);
1361 }
1362
1363 static int
1364 LogLuvFixupTags(TIFF* tif)
1365 {
1366 (void) tif;
1367 return (1);
1368 }
1369
1370 static int
1371 LogLuvSetupDecode(TIFF* tif)
1372 {
1373 static const char module[] = "LogLuvSetupDecode";
1374 LogLuvState* sp = DecoderState(tif);
1375 TIFFDirectory* td = &tif->tif_dir;
1376
1377 tif->tif_postdecode = _TIFFNoPostDecode;
1378 switch (td->td_photometric) {
1379 case PHOTOMETRIC_LOGLUV:
1380 if (!LogLuvInitState(tif))
1381 break;
1382 if (td->td_compression == COMPRESSION_SGILOG24) {
1383 tif->tif_decoderow = LogLuvDecode24;
1384 switch (sp->user_datafmt) {
1385 case SGILOGDATAFMT_FLOAT:
1386 sp->tfunc = Luv24toXYZ;
1387 break;
1388 case SGILOGDATAFMT_16BIT:
1389 sp->tfunc = Luv24toLuv48;
1390 break;
1391 case SGILOGDATAFMT_8BIT:
1392 sp->tfunc = Luv24toRGB;
1393 break;
1394 }
1395 } else {
1396 tif->tif_decoderow = LogLuvDecode32;
1397 switch (sp->user_datafmt) {
1398 case SGILOGDATAFMT_FLOAT:
1399 sp->tfunc = Luv32toXYZ;
1400 break;
1401 case SGILOGDATAFMT_16BIT:
1402 sp->tfunc = Luv32toLuv48;
1403 break;
1404 case SGILOGDATAFMT_8BIT:
1405 sp->tfunc = Luv32toRGB;
1406 break;
1407 }
1408 }
1409 return (1);
1410 case PHOTOMETRIC_LOGL:
1411 if (!LogL16InitState(tif))
1412 break;
1413 tif->tif_decoderow = LogL16Decode;
1414 switch (sp->user_datafmt) {
1415 case SGILOGDATAFMT_FLOAT:
1416 sp->tfunc = L16toY;
1417 break;
1418 case SGILOGDATAFMT_8BIT:
1419 sp->tfunc = L16toGry;
1420 break;
1421 }
1422 return (1);
1423 default:
1424 TIFFErrorExt(tif->tif_clientdata, module,
1425 "Inappropriate photometric interpretation %d for SGILog compression; %s",
1426 td->td_photometric, "must be either LogLUV or LogL");
1427 break;
1428 }
1429 return (0);
1430 }
1431
1432 static int
1433 LogLuvSetupEncode(TIFF* tif)
1434 {
1435 static const char module[] = "LogLuvSetupEncode";
1436 LogLuvState* sp = EncoderState(tif);
1437 TIFFDirectory* td = &tif->tif_dir;
1438
1439 switch (td->td_photometric) {
1440 case PHOTOMETRIC_LOGLUV:
1441 if (!LogLuvInitState(tif))
1442 break;
1443 if (td->td_compression == COMPRESSION_SGILOG24) {
1444 tif->tif_encoderow = LogLuvEncode24;
1445 switch (sp->user_datafmt) {
1446 case SGILOGDATAFMT_FLOAT:
1447 sp->tfunc = Luv24fromXYZ;
1448 break;
1449 case SGILOGDATAFMT_16BIT:
1450 sp->tfunc = Luv24fromLuv48;
1451 break;
1452 case SGILOGDATAFMT_RAW:
1453 break;
1454 default:
1455 goto notsupported;
1456 }
1457 } else {
1458 tif->tif_encoderow = LogLuvEncode32;
1459 switch (sp->user_datafmt) {
1460 case SGILOGDATAFMT_FLOAT:
1461 sp->tfunc = Luv32fromXYZ;
1462 break;
1463 case SGILOGDATAFMT_16BIT:
1464 sp->tfunc = Luv32fromLuv48;
1465 break;
1466 case SGILOGDATAFMT_RAW:
1467 break;
1468 default:
1469 goto notsupported;
1470 }
1471 }
1472 break;
1473 case PHOTOMETRIC_LOGL:
1474 if (!LogL16InitState(tif))
1475 break;
1476 tif->tif_encoderow = LogL16Encode;
1477 switch (sp->user_datafmt) {
1478 case SGILOGDATAFMT_FLOAT:
1479 sp->tfunc = L16fromY;
1480 break;
1481 case SGILOGDATAFMT_16BIT:
1482 break;
1483 default:
1484 goto notsupported;
1485 }
1486 break;
1487 default:
1488 TIFFErrorExt(tif->tif_clientdata, module,
1489 "Inappropriate photometric interpretation %d for SGILog compression; %s",
1490 td->td_photometric, "must be either LogLUV or LogL");
1491 break;
1492 }
1493 return (1);
1494 notsupported:
1495 TIFFErrorExt(tif->tif_clientdata, module,
1496 "SGILog compression supported only for %s, or raw data",
1497 td->td_photometric == PHOTOMETRIC_LOGL ? "Y, L" : "XYZ, Luv");
1498 return (0);
1499 }
1500
1501 static void
1502 LogLuvClose(TIFF* tif)
1503 {
1504 TIFFDirectory *td = &tif->tif_dir;
1505
1506 /*
1507 * For consistency, we always want to write out the same
1508 * bitspersample and sampleformat for our TIFF file,
1509 * regardless of the data format being used by the application.
1510 * Since this routine is called after tags have been set but
1511 * before they have been recorded in the file, we reset them here.
1512 */
1513 td->td_samplesperpixel =
1514 (td->td_photometric == PHOTOMETRIC_LOGL) ? 1 : 3;
1515 td->td_bitspersample = 16;
1516 td->td_sampleformat = SAMPLEFORMAT_INT;
1517 }
1518
1519 static void
1520 LogLuvCleanup(TIFF* tif)
1521 {
1522 LogLuvState* sp = (LogLuvState *)tif->tif_data;
1523
1524 assert(sp != 0);
1525
1526 tif->tif_tagmethods.vgetfield = sp->vgetparent;
1527 tif->tif_tagmethods.vsetfield = sp->vsetparent;
1528
1529 if (sp->tbuf)
1530 _TIFFfree(sp->tbuf);
1531 _TIFFfree(sp);
1532 tif->tif_data = NULL;
1533
1534 _TIFFSetDefaultCompressionState(tif);
1535 }
1536
1537 static int
1538 LogLuvVSetField(TIFF* tif, uint32 tag, va_list ap)
1539 {
1540 static const char module[] = "LogLuvVSetField";
1541 LogLuvState* sp = DecoderState(tif);
1542 int bps, fmt;
1543
1544 switch (tag) {
1545 case TIFFTAG_SGILOGDATAFMT:
1546 sp->user_datafmt = (int) va_arg(ap, int);
1547 /*
1548 * Tweak the TIFF header so that the rest of libtiff knows what
1549 * size of data will be passed between app and library, and
1550 * assume that the app knows what it is doing and is not
1551 * confused by these header manipulations...
1552 */
1553 switch (sp->user_datafmt) {
1554 case SGILOGDATAFMT_FLOAT:
1555 bps = 32, fmt = SAMPLEFORMAT_IEEEFP;
1556 break;
1557 case SGILOGDATAFMT_16BIT:
1558 bps = 16, fmt = SAMPLEFORMAT_INT;
1559 break;
1560 case SGILOGDATAFMT_RAW:
1561 bps = 32, fmt = SAMPLEFORMAT_UINT;
1562 TIFFSetField(tif, TIFFTAG_SAMPLESPERPIXEL, 1);
1563 break;
1564 case SGILOGDATAFMT_8BIT:
1565 bps = 8, fmt = SAMPLEFORMAT_UINT;
1566 break;
1567 default:
1568 TIFFErrorExt(tif->tif_clientdata, tif->tif_name,
1569 "Unknown data format %d for LogLuv compression",
1570 sp->user_datafmt);
1571 return (0);
1572 }
1573 TIFFSetField(tif, TIFFTAG_BITSPERSAMPLE, bps);
1574 TIFFSetField(tif, TIFFTAG_SAMPLEFORMAT, fmt);
1575 /*
1576 * Must recalculate sizes should bits/sample change.
1577 */
1578 tif->tif_tilesize = isTiled(tif) ? TIFFTileSize(tif) : (tmsize_t) -1;
1579 tif->tif_scanlinesize = TIFFScanlineSize(tif);
1580 return (1);
1581 case TIFFTAG_SGILOGENCODE:
1582 sp->encode_meth = (int) va_arg(ap, int);
1583 if (sp->encode_meth != SGILOGENCODE_NODITHER &&
1584 sp->encode_meth != SGILOGENCODE_RANDITHER) {
1585 TIFFErrorExt(tif->tif_clientdata, module,
1586 "Unknown encoding %d for LogLuv compression",
1587 sp->encode_meth);
1588 return (0);
1589 }
1590 return (1);
1591 default:
1592 return (*sp->vsetparent)(tif, tag, ap);
1593 }
1594 }
1595
1596 static int
1597 LogLuvVGetField(TIFF* tif, uint32 tag, va_list ap)
1598 {
1599 LogLuvState *sp = (LogLuvState *)tif->tif_data;
1600
1601 switch (tag) {
1602 case TIFFTAG_SGILOGDATAFMT:
1603 *va_arg(ap, int*) = sp->user_datafmt;
1604 return (1);
1605 default:
1606 return (*sp->vgetparent)(tif, tag, ap);
1607 }
1608 }
1609
1610 static const TIFFField LogLuvFields[] = {
1611 { TIFFTAG_SGILOGDATAFMT, 0, 0, TIFF_SHORT, 0, TIFF_SETGET_INT, TIFF_SETGET_UNDEFINED, FIELD_PSEUDO, TRUE, FALSE, "SGILogDataFmt", NULL},
1612 { TIFFTAG_SGILOGENCODE, 0, 0, TIFF_SHORT, 0, TIFF_SETGET_INT, TIFF_SETGET_UNDEFINED, FIELD_PSEUDO, TRUE, FALSE, "SGILogEncode", NULL}
1613 };
1614
1615 int
1616 TIFFInitSGILog(TIFF* tif, int scheme)
1617 {
1618 static const char module[] = "TIFFInitSGILog";
1619 LogLuvState* sp;
1620
1621 assert(scheme == COMPRESSION_SGILOG24 || scheme == COMPRESSION_SGILOG);
1622
1623 /*
1624 * Merge codec-specific tag information.
1625 */
1626 if (!_TIFFMergeFields(tif, LogLuvFields,
1627 TIFFArrayCount(LogLuvFields))) {
1628 TIFFErrorExt(tif->tif_clientdata, module,
1629 "Merging SGILog codec-specific tags failed");
1630 return 0;
1631 }
1632
1633 /*
1634 * Allocate state block so tag methods have storage to record values.
1635 */
1636 tif->tif_data = (uint8*) _TIFFmalloc(sizeof (LogLuvState));
1637 if (tif->tif_data == NULL)
1638 goto bad;
1639 sp = (LogLuvState*) tif->tif_data;
1640 _TIFFmemset((void*)sp, 0, sizeof (*sp));
1641 sp->user_datafmt = SGILOGDATAFMT_UNKNOWN;
1642 sp->encode_meth = (scheme == COMPRESSION_SGILOG24) ?
1643 SGILOGENCODE_RANDITHER : SGILOGENCODE_NODITHER;
1644 sp->tfunc = _logLuvNop;
1645
1646 /*
1647 * Install codec methods.
1648 * NB: tif_decoderow & tif_encoderow are filled
1649 * in at setup time.
1650 */
1651 tif->tif_fixuptags = LogLuvFixupTags;
1652 tif->tif_setupdecode = LogLuvSetupDecode;
1653 tif->tif_decodestrip = LogLuvDecodeStrip;
1654 tif->tif_decodetile = LogLuvDecodeTile;
1655 tif->tif_setupencode = LogLuvSetupEncode;
1656 tif->tif_encodestrip = LogLuvEncodeStrip;
1657 tif->tif_encodetile = LogLuvEncodeTile;
1658 tif->tif_close = LogLuvClose;
1659 tif->tif_cleanup = LogLuvCleanup;
1660
1661 /*
1662 * Override parent get/set field methods.
1663 */
1664 sp->vgetparent = tif->tif_tagmethods.vgetfield;
1665 tif->tif_tagmethods.vgetfield = LogLuvVGetField; /* hook for codec tags */
1666 sp->vsetparent = tif->tif_tagmethods.vsetfield;
1667 tif->tif_tagmethods.vsetfield = LogLuvVSetField; /* hook for codec tags */
1668
1669 return (1);
1670 bad:
1671 TIFFErrorExt(tif->tif_clientdata, module,
1672 "%s: No space for LogLuv state block", tif->tif_name);
1673 return (0);
1674 }
1675 #endif /* LOGLUV_SUPPORT */
1676
1677 /* vim: set ts=8 sts=8 sw=8 noet: */
1678 /*
1679 * Local Variables:
1680 * mode: c
1681 * c-basic-offset: 8
1682 * fill-column: 78
1683 * End:
1684 */
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