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