1 /* $Id: tif_luv.c,v 1.40 2015-06-21 01:09:09 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 "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, cc -= rowlen;
406 return (cc == 0);
407 }
408
409 /*
410 * Decode a tile of pixels. We break it into rows to
411 * maintain synchrony with the encode algorithm, which
412 * is row by row.
413 */
414 static int
LogLuvDecodeTile(TIFF * tif,uint8 * bp,tmsize_t cc,uint16 s)415 LogLuvDecodeTile(TIFF* tif, uint8* bp, tmsize_t cc, uint16 s)
416 {
417 tmsize_t rowlen = TIFFTileRowSize(tif);
418
419 if (rowlen == 0)
420 return 0;
421
422 assert(cc%rowlen == 0);
423 while (cc && (*tif->tif_decoderow)(tif, bp, rowlen, s))
424 bp += rowlen, cc -= rowlen;
425 return (cc == 0);
426 }
427
428 /*
429 * Encode a row of 16-bit pixels.
430 */
431 static int
LogL16Encode(TIFF * tif,uint8 * bp,tmsize_t cc,uint16 s)432 LogL16Encode(TIFF* tif, uint8* bp, tmsize_t cc, uint16 s)
433 {
434 static const char module[] = "LogL16Encode";
435 LogLuvState* sp = EncoderState(tif);
436 int shft;
437 tmsize_t i;
438 tmsize_t j;
439 tmsize_t npixels;
440 uint8* op;
441 int16* tp;
442 int16 b;
443 tmsize_t occ;
444 int rc=0, mask;
445 tmsize_t beg;
446
447 assert(s == 0);
448 assert(sp != NULL);
449 npixels = cc / sp->pixel_size;
450
451 if (sp->user_datafmt == SGILOGDATAFMT_16BIT)
452 tp = (int16*) bp;
453 else {
454 tp = (int16*) sp->tbuf;
455 if(sp->tbuflen < npixels) {
456 TIFFErrorExt(tif->tif_clientdata, module,
457 "Translation buffer too short");
458 return (0);
459 }
460 (*sp->tfunc)(sp, bp, npixels);
461 }
462 /* compress each byte string */
463 op = tif->tif_rawcp;
464 occ = tif->tif_rawdatasize - tif->tif_rawcc;
465 for (shft = 2*8; (shft -= 8) >= 0; )
466 for (i = 0; i < npixels; i += rc) {
467 if (occ < 4) {
468 tif->tif_rawcp = op;
469 tif->tif_rawcc = tif->tif_rawdatasize - occ;
470 if (!TIFFFlushData1(tif))
471 return (-1);
472 op = tif->tif_rawcp;
473 occ = tif->tif_rawdatasize - tif->tif_rawcc;
474 }
475 mask = 0xff << shft; /* find next run */
476 for (beg = i; beg < npixels; beg += rc) {
477 b = (int16) (tp[beg] & mask);
478 rc = 1;
479 while (rc < 127+2 && beg+rc < npixels &&
480 (tp[beg+rc] & mask) == b)
481 rc++;
482 if (rc >= MINRUN)
483 break; /* long enough */
484 }
485 if (beg-i > 1 && beg-i < MINRUN) {
486 b = (int16) (tp[i] & mask);/*check short run */
487 j = i+1;
488 while ((tp[j++] & mask) == b)
489 if (j == beg) {
490 *op++ = (uint8)(128-2+j-i);
491 *op++ = (uint8)(b >> shft);
492 occ -= 2;
493 i = beg;
494 break;
495 }
496 }
497 while (i < beg) { /* write out non-run */
498 if ((j = beg-i) > 127) j = 127;
499 if (occ < j+3) {
500 tif->tif_rawcp = op;
501 tif->tif_rawcc = tif->tif_rawdatasize - occ;
502 if (!TIFFFlushData1(tif))
503 return (-1);
504 op = tif->tif_rawcp;
505 occ = tif->tif_rawdatasize - tif->tif_rawcc;
506 }
507 *op++ = (uint8) j; occ--;
508 while (j--) {
509 *op++ = (uint8) (tp[i++] >> shft & 0xff);
510 occ--;
511 }
512 }
513 if (rc >= MINRUN) { /* write out run */
514 *op++ = (uint8) (128-2+rc);
515 *op++ = (uint8) (tp[beg] >> shft & 0xff);
516 occ -= 2;
517 } else
518 rc = 0;
519 }
520 tif->tif_rawcp = op;
521 tif->tif_rawcc = tif->tif_rawdatasize - occ;
522
523 return (1);
524 }
525
526 /*
527 * Encode a row of 24-bit pixels.
528 */
529 static int
LogLuvEncode24(TIFF * tif,uint8 * bp,tmsize_t cc,uint16 s)530 LogLuvEncode24(TIFF* tif, uint8* bp, tmsize_t cc, uint16 s)
531 {
532 static const char module[] = "LogLuvEncode24";
533 LogLuvState* sp = EncoderState(tif);
534 tmsize_t i;
535 tmsize_t npixels;
536 tmsize_t occ;
537 uint8* op;
538 uint32* tp;
539
540 assert(s == 0);
541 assert(sp != NULL);
542 npixels = cc / sp->pixel_size;
543
544 if (sp->user_datafmt == SGILOGDATAFMT_RAW)
545 tp = (uint32*) bp;
546 else {
547 tp = (uint32*) sp->tbuf;
548 if(sp->tbuflen < npixels) {
549 TIFFErrorExt(tif->tif_clientdata, module,
550 "Translation buffer too short");
551 return (0);
552 }
553 (*sp->tfunc)(sp, bp, npixels);
554 }
555 /* write out encoded pixels */
556 op = tif->tif_rawcp;
557 occ = tif->tif_rawdatasize - tif->tif_rawcc;
558 for (i = npixels; i--; ) {
559 if (occ < 3) {
560 tif->tif_rawcp = op;
561 tif->tif_rawcc = tif->tif_rawdatasize - occ;
562 if (!TIFFFlushData1(tif))
563 return (-1);
564 op = tif->tif_rawcp;
565 occ = tif->tif_rawdatasize - tif->tif_rawcc;
566 }
567 *op++ = (uint8)(*tp >> 16);
568 *op++ = (uint8)(*tp >> 8 & 0xff);
569 *op++ = (uint8)(*tp++ & 0xff);
570 occ -= 3;
571 }
572 tif->tif_rawcp = op;
573 tif->tif_rawcc = tif->tif_rawdatasize - occ;
574
575 return (1);
576 }
577
578 /*
579 * Encode a row of 32-bit pixels.
580 */
581 static int
LogLuvEncode32(TIFF * tif,uint8 * bp,tmsize_t cc,uint16 s)582 LogLuvEncode32(TIFF* tif, uint8* bp, tmsize_t cc, uint16 s)
583 {
584 static const char module[] = "LogLuvEncode32";
585 LogLuvState* sp = EncoderState(tif);
586 int shft;
587 tmsize_t i;
588 tmsize_t j;
589 tmsize_t npixels;
590 uint8* op;
591 uint32* tp;
592 uint32 b;
593 tmsize_t occ;
594 int rc=0, mask;
595 tmsize_t beg;
596
597 assert(s == 0);
598 assert(sp != NULL);
599
600 npixels = cc / sp->pixel_size;
601
602 if (sp->user_datafmt == SGILOGDATAFMT_RAW)
603 tp = (uint32*) bp;
604 else {
605 tp = (uint32*) sp->tbuf;
606 if(sp->tbuflen < npixels) {
607 TIFFErrorExt(tif->tif_clientdata, module,
608 "Translation buffer too short");
609 return (0);
610 }
611 (*sp->tfunc)(sp, bp, npixels);
612 }
613 /* compress each byte string */
614 op = tif->tif_rawcp;
615 occ = tif->tif_rawdatasize - tif->tif_rawcc;
616 for (shft = 4*8; (shft -= 8) >= 0; )
617 for (i = 0; i < npixels; i += rc) {
618 if (occ < 4) {
619 tif->tif_rawcp = op;
620 tif->tif_rawcc = tif->tif_rawdatasize - occ;
621 if (!TIFFFlushData1(tif))
622 return (-1);
623 op = tif->tif_rawcp;
624 occ = tif->tif_rawdatasize - tif->tif_rawcc;
625 }
626 mask = 0xff << shft; /* find next run */
627 for (beg = i; beg < npixels; beg += rc) {
628 b = tp[beg] & mask;
629 rc = 1;
630 while (rc < 127+2 && beg+rc < npixels &&
631 (tp[beg+rc] & mask) == b)
632 rc++;
633 if (rc >= MINRUN)
634 break; /* long enough */
635 }
636 if (beg-i > 1 && beg-i < MINRUN) {
637 b = tp[i] & mask; /* check short run */
638 j = i+1;
639 while ((tp[j++] & mask) == b)
640 if (j == beg) {
641 *op++ = (uint8)(128-2+j-i);
642 *op++ = (uint8)(b >> shft);
643 occ -= 2;
644 i = beg;
645 break;
646 }
647 }
648 while (i < beg) { /* write out non-run */
649 if ((j = beg-i) > 127) j = 127;
650 if (occ < j+3) {
651 tif->tif_rawcp = op;
652 tif->tif_rawcc = tif->tif_rawdatasize - occ;
653 if (!TIFFFlushData1(tif))
654 return (-1);
655 op = tif->tif_rawcp;
656 occ = tif->tif_rawdatasize - tif->tif_rawcc;
657 }
658 *op++ = (uint8) j; occ--;
659 while (j--) {
660 *op++ = (uint8)(tp[i++] >> shft & 0xff);
661 occ--;
662 }
663 }
664 if (rc >= MINRUN) { /* write out run */
665 *op++ = (uint8) (128-2+rc);
666 *op++ = (uint8)(tp[beg] >> shft & 0xff);
667 occ -= 2;
668 } else
669 rc = 0;
670 }
671 tif->tif_rawcp = op;
672 tif->tif_rawcc = tif->tif_rawdatasize - occ;
673
674 return (1);
675 }
676
677 /*
678 * Encode a strip of pixels. We break it into rows to
679 * avoid encoding runs across row boundaries.
680 */
681 static int
LogLuvEncodeStrip(TIFF * tif,uint8 * bp,tmsize_t cc,uint16 s)682 LogLuvEncodeStrip(TIFF* tif, uint8* bp, tmsize_t cc, uint16 s)
683 {
684 tmsize_t rowlen = TIFFScanlineSize(tif);
685
686 if (rowlen == 0)
687 return 0;
688
689 assert(cc%rowlen == 0);
690 while (cc && (*tif->tif_encoderow)(tif, bp, rowlen, s) == 1)
691 bp += rowlen, cc -= rowlen;
692 return (cc == 0);
693 }
694
695 /*
696 * Encode a tile of pixels. We break it into rows to
697 * avoid encoding runs across row boundaries.
698 */
699 static int
LogLuvEncodeTile(TIFF * tif,uint8 * bp,tmsize_t cc,uint16 s)700 LogLuvEncodeTile(TIFF* tif, uint8* bp, tmsize_t cc, uint16 s)
701 {
702 tmsize_t rowlen = TIFFTileRowSize(tif);
703
704 if (rowlen == 0)
705 return 0;
706
707 assert(cc%rowlen == 0);
708 while (cc && (*tif->tif_encoderow)(tif, bp, rowlen, s) == 1)
709 bp += rowlen, cc -= rowlen;
710 return (cc == 0);
711 }
712
713 /*
714 * Encode/Decode functions for converting to and from user formats.
715 */
716
717 #include "uvcode.h"
718
719 #ifndef UVSCALE
720 #define U_NEU 0.210526316
721 #define V_NEU 0.473684211
722 #define UVSCALE 410.
723 #endif
724
725 #ifndef M_LN2
726 #define M_LN2 0.69314718055994530942
727 #endif
728 #ifndef M_PI
729 #define M_PI 3.14159265358979323846
730 #endif
731 #undef log2 /* Conflict with C'99 function */
732 #define log2(x) ((1./M_LN2)*log(x))
733 #undef exp2 /* Conflict with C'99 function */
734 #define exp2(x) exp(M_LN2*(x))
735
736 #define itrunc(x,m) ((m)==SGILOGENCODE_NODITHER ? \
737 (int)(x) : \
738 (int)((x) + rand()*(1./RAND_MAX) - .5))
739
740 #if !LOGLUV_PUBLIC
741 static
742 #endif
743 double
LogL16toY(int p16)744 LogL16toY(int p16) /* compute luminance from 16-bit LogL */
745 {
746 int Le = p16 & 0x7fff;
747 double Y;
748
749 if (!Le)
750 return (0.);
751 Y = exp(M_LN2/256.*(Le+.5) - M_LN2*64.);
752 return (!(p16 & 0x8000) ? Y : -Y);
753 }
754
755 #if !LOGLUV_PUBLIC
756 static
757 #endif
758 int
LogL16fromY(double Y,int em)759 LogL16fromY(double Y, int em) /* get 16-bit LogL from Y */
760 {
761 if (Y >= 1.8371976e19)
762 return (0x7fff);
763 if (Y <= -1.8371976e19)
764 return (0xffff);
765 if (Y > 5.4136769e-20)
766 return itrunc(256.*(log2(Y) + 64.), em);
767 if (Y < -5.4136769e-20)
768 return (~0x7fff | itrunc(256.*(log2(-Y) + 64.), em));
769 return (0);
770 }
771
772 static void
L16toY(LogLuvState * sp,uint8 * op,tmsize_t n)773 L16toY(LogLuvState* sp, uint8* op, tmsize_t n)
774 {
775 int16* l16 = (int16*) sp->tbuf;
776 float* yp = (float*) op;
777
778 while (n-- > 0)
779 *yp++ = (float)LogL16toY(*l16++);
780 }
781
782 static void
L16toGry(LogLuvState * sp,uint8 * op,tmsize_t n)783 L16toGry(LogLuvState* sp, uint8* op, tmsize_t n)
784 {
785 int16* l16 = (int16*) sp->tbuf;
786 uint8* gp = (uint8*) op;
787
788 while (n-- > 0) {
789 double Y = LogL16toY(*l16++);
790 *gp++ = (uint8) ((Y <= 0.) ? 0 : (Y >= 1.) ? 255 : (int)(256.*sqrt(Y)));
791 }
792 }
793
794 static void
L16fromY(LogLuvState * sp,uint8 * op,tmsize_t n)795 L16fromY(LogLuvState* sp, uint8* op, tmsize_t n)
796 {
797 int16* l16 = (int16*) sp->tbuf;
798 float* yp = (float*) op;
799
800 while (n-- > 0)
801 *l16++ = (int16) (LogL16fromY(*yp++, sp->encode_meth));
802 }
803
804 #if !LOGLUV_PUBLIC
805 static
806 #endif
807 void
XYZtoRGB24(float xyz[3],uint8 rgb[3])808 XYZtoRGB24(float xyz[3], uint8 rgb[3])
809 {
810 double r, g, b;
811 /* assume CCIR-709 primaries */
812 r = 2.690*xyz[0] + -1.276*xyz[1] + -0.414*xyz[2];
813 g = -1.022*xyz[0] + 1.978*xyz[1] + 0.044*xyz[2];
814 b = 0.061*xyz[0] + -0.224*xyz[1] + 1.163*xyz[2];
815 /* assume 2.0 gamma for speed */
816 /* could use integer sqrt approx., but this is probably faster */
817 rgb[0] = (uint8)((r<=0.) ? 0 : (r >= 1.) ? 255 : (int)(256.*sqrt(r)));
818 rgb[1] = (uint8)((g<=0.) ? 0 : (g >= 1.) ? 255 : (int)(256.*sqrt(g)));
819 rgb[2] = (uint8)((b<=0.) ? 0 : (b >= 1.) ? 255 : (int)(256.*sqrt(b)));
820 }
821
822 #if !LOGLUV_PUBLIC
823 static
824 #endif
825 double
LogL10toY(int p10)826 LogL10toY(int p10) /* compute luminance from 10-bit LogL */
827 {
828 if (p10 == 0)
829 return (0.);
830 return (exp(M_LN2/64.*(p10+.5) - M_LN2*12.));
831 }
832
833 #if !LOGLUV_PUBLIC
834 static
835 #endif
836 int
LogL10fromY(double Y,int em)837 LogL10fromY(double Y, int em) /* get 10-bit LogL from Y */
838 {
839 if (Y >= 15.742)
840 return (0x3ff);
841 else if (Y <= .00024283)
842 return (0);
843 else
844 return itrunc(64.*(log2(Y) + 12.), em);
845 }
846
847 #define NANGLES 100
848 #define uv2ang(u, v) ( (NANGLES*.499999999/M_PI) \
849 * atan2((v)-V_NEU,(u)-U_NEU) + .5*NANGLES )
850
851 static int
oog_encode(double u,double v)852 oog_encode(double u, double v) /* encode out-of-gamut chroma */
853 {
854 static int oog_table[NANGLES];
855 static int initialized = 0;
856 register int i;
857
858 if (!initialized) { /* set up perimeter table */
859 double eps[NANGLES], ua, va, ang, epsa;
860 int ui, vi, ustep;
861 for (i = NANGLES; i--; )
862 eps[i] = 2.;
863 for (vi = UV_NVS; vi--; ) {
864 va = UV_VSTART + (vi+.5)*UV_SQSIZ;
865 ustep = uv_row[vi].nus-1;
866 if (vi == UV_NVS-1 || vi == 0 || ustep <= 0)
867 ustep = 1;
868 for (ui = uv_row[vi].nus-1; ui >= 0; ui -= ustep) {
869 ua = uv_row[vi].ustart + (ui+.5)*UV_SQSIZ;
870 ang = uv2ang(ua, va);
871 i = (int) ang;
872 epsa = fabs(ang - (i+.5));
873 if (epsa < eps[i]) {
874 oog_table[i] = uv_row[vi].ncum + ui;
875 eps[i] = epsa;
876 }
877 }
878 }
879 for (i = NANGLES; i--; ) /* fill any holes */
880 if (eps[i] > 1.5) {
881 int i1, i2;
882 for (i1 = 1; i1 < NANGLES/2; i1++)
883 if (eps[(i+i1)%NANGLES] < 1.5)
884 break;
885 for (i2 = 1; i2 < NANGLES/2; i2++)
886 if (eps[(i+NANGLES-i2)%NANGLES] < 1.5)
887 break;
888 if (i1 < i2)
889 oog_table[i] =
890 oog_table[(i+i1)%NANGLES];
891 else
892 oog_table[i] =
893 oog_table[(i+NANGLES-i2)%NANGLES];
894 }
895 initialized = 1;
896 }
897 i = (int) uv2ang(u, v); /* look up hue angle */
898 return (oog_table[i]);
899 }
900
901 #undef uv2ang
902 #undef NANGLES
903
904 #if !LOGLUV_PUBLIC
905 static
906 #endif
907 int
uv_encode(double u,double v,int em)908 uv_encode(double u, double v, int em) /* encode (u',v') coordinates */
909 {
910 register int vi, ui;
911
912 if (v < UV_VSTART)
913 return oog_encode(u, v);
914 vi = itrunc((v - UV_VSTART)*(1./UV_SQSIZ), em);
915 if (vi >= UV_NVS)
916 return oog_encode(u, v);
917 if (u < uv_row[vi].ustart)
918 return oog_encode(u, v);
919 ui = itrunc((u - uv_row[vi].ustart)*(1./UV_SQSIZ), em);
920 if (ui >= uv_row[vi].nus)
921 return oog_encode(u, v);
922
923 return (uv_row[vi].ncum + ui);
924 }
925
926 #if !LOGLUV_PUBLIC
927 static
928 #endif
929 int
uv_decode(double * up,double * vp,int c)930 uv_decode(double *up, double *vp, int c) /* decode (u',v') index */
931 {
932 int upper, lower;
933 register int ui, vi;
934
935 if (c < 0 || c >= UV_NDIVS)
936 return (-1);
937 lower = 0; /* binary search */
938 upper = UV_NVS;
939 while (upper - lower > 1) {
940 vi = (lower + upper) >> 1;
941 ui = c - uv_row[vi].ncum;
942 if (ui > 0)
943 lower = vi;
944 else if (ui < 0)
945 upper = vi;
946 else {
947 lower = vi;
948 break;
949 }
950 }
951 vi = lower;
952 ui = c - uv_row[vi].ncum;
953 *up = uv_row[vi].ustart + (ui+.5)*UV_SQSIZ;
954 *vp = UV_VSTART + (vi+.5)*UV_SQSIZ;
955 return (0);
956 }
957
958 #if !LOGLUV_PUBLIC
959 static
960 #endif
961 void
LogLuv24toXYZ(uint32 p,float XYZ[3])962 LogLuv24toXYZ(uint32 p, float XYZ[3])
963 {
964 int Ce;
965 double L, u, v, s, x, y;
966 /* decode luminance */
967 L = LogL10toY(p>>14 & 0x3ff);
968 if (L <= 0.) {
969 XYZ[0] = XYZ[1] = XYZ[2] = 0.;
970 return;
971 }
972 /* decode color */
973 Ce = p & 0x3fff;
974 if (uv_decode(&u, &v, Ce) < 0) {
975 u = U_NEU; v = V_NEU;
976 }
977 s = 1./(6.*u - 16.*v + 12.);
978 x = 9.*u * s;
979 y = 4.*v * s;
980 /* convert to XYZ */
981 XYZ[0] = (float)(x/y * L);
982 XYZ[1] = (float)L;
983 XYZ[2] = (float)((1.-x-y)/y * L);
984 }
985
986 #if !LOGLUV_PUBLIC
987 static
988 #endif
989 uint32
LogLuv24fromXYZ(float XYZ[3],int em)990 LogLuv24fromXYZ(float XYZ[3], int em)
991 {
992 int Le, Ce;
993 double u, v, s;
994 /* encode luminance */
995 Le = LogL10fromY(XYZ[1], em);
996 /* encode color */
997 s = XYZ[0] + 15.*XYZ[1] + 3.*XYZ[2];
998 if (!Le || s <= 0.) {
999 u = U_NEU;
1000 v = V_NEU;
1001 } else {
1002 u = 4.*XYZ[0] / s;
1003 v = 9.*XYZ[1] / s;
1004 }
1005 Ce = uv_encode(u, v, em);
1006 if (Ce < 0) /* never happens */
1007 Ce = uv_encode(U_NEU, V_NEU, SGILOGENCODE_NODITHER);
1008 /* combine encodings */
1009 return (Le << 14 | Ce);
1010 }
1011
1012 static void
Luv24toXYZ(LogLuvState * sp,uint8 * op,tmsize_t n)1013 Luv24toXYZ(LogLuvState* sp, uint8* op, tmsize_t n)
1014 {
1015 uint32* luv = (uint32*) sp->tbuf;
1016 float* xyz = (float*) op;
1017
1018 while (n-- > 0) {
1019 LogLuv24toXYZ(*luv, xyz);
1020 xyz += 3;
1021 luv++;
1022 }
1023 }
1024
1025 static void
Luv24toLuv48(LogLuvState * sp,uint8 * op,tmsize_t n)1026 Luv24toLuv48(LogLuvState* sp, uint8* op, tmsize_t n)
1027 {
1028 uint32* luv = (uint32*) sp->tbuf;
1029 int16* luv3 = (int16*) op;
1030
1031 while (n-- > 0) {
1032 double u, v;
1033
1034 *luv3++ = (int16)((*luv >> 12 & 0xffd) + 13314);
1035 if (uv_decode(&u, &v, *luv&0x3fff) < 0) {
1036 u = U_NEU;
1037 v = V_NEU;
1038 }
1039 *luv3++ = (int16)(u * (1L<<15));
1040 *luv3++ = (int16)(v * (1L<<15));
1041 luv++;
1042 }
1043 }
1044
1045 static void
Luv24toRGB(LogLuvState * sp,uint8 * op,tmsize_t n)1046 Luv24toRGB(LogLuvState* sp, uint8* op, tmsize_t n)
1047 {
1048 uint32* luv = (uint32*) sp->tbuf;
1049 uint8* rgb = (uint8*) op;
1050
1051 while (n-- > 0) {
1052 float xyz[3];
1053
1054 LogLuv24toXYZ(*luv++, xyz);
1055 XYZtoRGB24(xyz, rgb);
1056 rgb += 3;
1057 }
1058 }
1059
1060 static void
Luv24fromXYZ(LogLuvState * sp,uint8 * op,tmsize_t n)1061 Luv24fromXYZ(LogLuvState* sp, uint8* op, tmsize_t n)
1062 {
1063 uint32* luv = (uint32*) sp->tbuf;
1064 float* xyz = (float*) op;
1065
1066 while (n-- > 0) {
1067 *luv++ = LogLuv24fromXYZ(xyz, sp->encode_meth);
1068 xyz += 3;
1069 }
1070 }
1071
1072 static void
Luv24fromLuv48(LogLuvState * sp,uint8 * op,tmsize_t n)1073 Luv24fromLuv48(LogLuvState* sp, uint8* op, tmsize_t n)
1074 {
1075 uint32* luv = (uint32*) sp->tbuf;
1076 int16* luv3 = (int16*) op;
1077
1078 while (n-- > 0) {
1079 int Le, Ce;
1080
1081 if (luv3[0] <= 0)
1082 Le = 0;
1083 else if (luv3[0] >= (1<<12)+3314)
1084 Le = (1<<10) - 1;
1085 else if (sp->encode_meth == SGILOGENCODE_NODITHER)
1086 Le = (luv3[0]-3314) >> 2;
1087 else
1088 Le = itrunc(.25*(luv3[0]-3314.), sp->encode_meth);
1089
1090 Ce = uv_encode((luv3[1]+.5)/(1<<15), (luv3[2]+.5)/(1<<15),
1091 sp->encode_meth);
1092 if (Ce < 0) /* never happens */
1093 Ce = uv_encode(U_NEU, V_NEU, SGILOGENCODE_NODITHER);
1094 *luv++ = (uint32)Le << 14 | Ce;
1095 luv3 += 3;
1096 }
1097 }
1098
1099 #if !LOGLUV_PUBLIC
1100 static
1101 #endif
1102 void
LogLuv32toXYZ(uint32 p,float XYZ[3])1103 LogLuv32toXYZ(uint32 p, float XYZ[3])
1104 {
1105 double L, u, v, s, x, y;
1106 /* decode luminance */
1107 L = LogL16toY((int)p >> 16);
1108 if (L <= 0.) {
1109 XYZ[0] = XYZ[1] = XYZ[2] = 0.;
1110 return;
1111 }
1112 /* decode color */
1113 u = 1./UVSCALE * ((p>>8 & 0xff) + .5);
1114 v = 1./UVSCALE * ((p & 0xff) + .5);
1115 s = 1./(6.*u - 16.*v + 12.);
1116 x = 9.*u * s;
1117 y = 4.*v * s;
1118 /* convert to XYZ */
1119 XYZ[0] = (float)(x/y * L);
1120 XYZ[1] = (float)L;
1121 XYZ[2] = (float)((1.-x-y)/y * L);
1122 }
1123
1124 #if !LOGLUV_PUBLIC
1125 static
1126 #endif
1127 uint32
LogLuv32fromXYZ(float XYZ[3],int em)1128 LogLuv32fromXYZ(float XYZ[3], int em)
1129 {
1130 unsigned int Le, ue, ve;
1131 double u, v, s;
1132 /* encode luminance */
1133 Le = (unsigned int)LogL16fromY(XYZ[1], em);
1134 /* encode color */
1135 s = XYZ[0] + 15.*XYZ[1] + 3.*XYZ[2];
1136 if (!Le || s <= 0.) {
1137 u = U_NEU;
1138 v = V_NEU;
1139 } else {
1140 u = 4.*XYZ[0] / s;
1141 v = 9.*XYZ[1] / s;
1142 }
1143 if (u <= 0.) ue = 0;
1144 else ue = itrunc(UVSCALE*u, em);
1145 if (ue > 255) ue = 255;
1146 if (v <= 0.) ve = 0;
1147 else ve = itrunc(UVSCALE*v, em);
1148 if (ve > 255) ve = 255;
1149 /* combine encodings */
1150 return (Le << 16 | ue << 8 | ve);
1151 }
1152
1153 static void
Luv32toXYZ(LogLuvState * sp,uint8 * op,tmsize_t n)1154 Luv32toXYZ(LogLuvState* sp, uint8* op, tmsize_t n)
1155 {
1156 uint32* luv = (uint32*) sp->tbuf;
1157 float* xyz = (float*) op;
1158
1159 while (n-- > 0) {
1160 LogLuv32toXYZ(*luv++, xyz);
1161 xyz += 3;
1162 }
1163 }
1164
1165 static void
Luv32toLuv48(LogLuvState * sp,uint8 * op,tmsize_t n)1166 Luv32toLuv48(LogLuvState* sp, uint8* op, tmsize_t n)
1167 {
1168 uint32* luv = (uint32*) sp->tbuf;
1169 int16* luv3 = (int16*) op;
1170
1171 while (n-- > 0) {
1172 double u, v;
1173
1174 *luv3++ = (int16)(*luv >> 16);
1175 u = 1./UVSCALE * ((*luv>>8 & 0xff) + .5);
1176 v = 1./UVSCALE * ((*luv & 0xff) + .5);
1177 *luv3++ = (int16)(u * (1L<<15));
1178 *luv3++ = (int16)(v * (1L<<15));
1179 luv++;
1180 }
1181 }
1182
1183 static void
Luv32toRGB(LogLuvState * sp,uint8 * op,tmsize_t n)1184 Luv32toRGB(LogLuvState* sp, uint8* op, tmsize_t n)
1185 {
1186 uint32* luv = (uint32*) sp->tbuf;
1187 uint8* rgb = (uint8*) op;
1188
1189 while (n-- > 0) {
1190 float xyz[3];
1191
1192 LogLuv32toXYZ(*luv++, xyz);
1193 XYZtoRGB24(xyz, rgb);
1194 rgb += 3;
1195 }
1196 }
1197
1198 static void
Luv32fromXYZ(LogLuvState * sp,uint8 * op,tmsize_t n)1199 Luv32fromXYZ(LogLuvState* sp, uint8* op, tmsize_t n)
1200 {
1201 uint32* luv = (uint32*) sp->tbuf;
1202 float* xyz = (float*) op;
1203
1204 while (n-- > 0) {
1205 *luv++ = LogLuv32fromXYZ(xyz, sp->encode_meth);
1206 xyz += 3;
1207 }
1208 }
1209
1210 static void
Luv32fromLuv48(LogLuvState * sp,uint8 * op,tmsize_t n)1211 Luv32fromLuv48(LogLuvState* sp, uint8* op, tmsize_t n)
1212 {
1213 uint32* luv = (uint32*) sp->tbuf;
1214 int16* luv3 = (int16*) op;
1215
1216 if (sp->encode_meth == SGILOGENCODE_NODITHER) {
1217 while (n-- > 0) {
1218 *luv++ = (uint32)luv3[0] << 16 |
1219 (luv3[1]*(uint32)(UVSCALE+.5) >> 7 & 0xff00) |
1220 (luv3[2]*(uint32)(UVSCALE+.5) >> 15 & 0xff);
1221 luv3 += 3;
1222 }
1223 return;
1224 }
1225 while (n-- > 0) {
1226 *luv++ = (uint32)luv3[0] << 16 |
1227 (itrunc(luv3[1]*(UVSCALE/(1<<15)), sp->encode_meth) << 8 & 0xff00) |
1228 (itrunc(luv3[2]*(UVSCALE/(1<<15)), sp->encode_meth) & 0xff);
1229 luv3 += 3;
1230 }
1231 }
1232
1233 static void
_logLuvNop(LogLuvState * sp,uint8 * op,tmsize_t n)1234 _logLuvNop(LogLuvState* sp, uint8* op, tmsize_t n)
1235 {
1236 (void) sp; (void) op; (void) n;
1237 }
1238
1239 static int
LogL16GuessDataFmt(TIFFDirectory * td)1240 LogL16GuessDataFmt(TIFFDirectory *td)
1241 {
1242 #define PACK(s,b,f) (((b)<<6)|((s)<<3)|(f))
1243 switch (PACK(td->td_samplesperpixel, td->td_bitspersample, td->td_sampleformat)) {
1244 case PACK(1, 32, SAMPLEFORMAT_IEEEFP):
1245 return (SGILOGDATAFMT_FLOAT);
1246 case PACK(1, 16, SAMPLEFORMAT_VOID):
1247 case PACK(1, 16, SAMPLEFORMAT_INT):
1248 case PACK(1, 16, SAMPLEFORMAT_UINT):
1249 return (SGILOGDATAFMT_16BIT);
1250 case PACK(1, 8, SAMPLEFORMAT_VOID):
1251 case PACK(1, 8, SAMPLEFORMAT_UINT):
1252 return (SGILOGDATAFMT_8BIT);
1253 }
1254 #undef PACK
1255 return (SGILOGDATAFMT_UNKNOWN);
1256 }
1257
1258 static tmsize_t
multiply_ms(tmsize_t m1,tmsize_t m2)1259 multiply_ms(tmsize_t m1, tmsize_t m2)
1260 {
1261 tmsize_t bytes = m1 * m2;
1262
1263 if (m1 && bytes / m1 != m2)
1264 bytes = 0;
1265
1266 return bytes;
1267 }
1268
1269 static int
LogL16InitState(TIFF * tif)1270 LogL16InitState(TIFF* tif)
1271 {
1272 static const char module[] = "LogL16InitState";
1273 TIFFDirectory *td = &tif->tif_dir;
1274 LogLuvState* sp = DecoderState(tif);
1275
1276 assert(sp != NULL);
1277 assert(td->td_photometric == PHOTOMETRIC_LOGL);
1278
1279 /* for some reason, we can't do this in TIFFInitLogL16 */
1280 if (sp->user_datafmt == SGILOGDATAFMT_UNKNOWN)
1281 sp->user_datafmt = LogL16GuessDataFmt(td);
1282 switch (sp->user_datafmt) {
1283 case SGILOGDATAFMT_FLOAT:
1284 sp->pixel_size = sizeof (float);
1285 break;
1286 case SGILOGDATAFMT_16BIT:
1287 sp->pixel_size = sizeof (int16);
1288 break;
1289 case SGILOGDATAFMT_8BIT:
1290 sp->pixel_size = sizeof (uint8);
1291 break;
1292 default:
1293 TIFFErrorExt(tif->tif_clientdata, module,
1294 "No support for converting user data format to LogL");
1295 return (0);
1296 }
1297 if( isTiled(tif) )
1298 sp->tbuflen = multiply_ms(td->td_tilewidth, td->td_tilelength);
1299 else
1300 sp->tbuflen = multiply_ms(td->td_imagewidth, td->td_rowsperstrip);
1301 if (multiply_ms(sp->tbuflen, sizeof (int16)) == 0 ||
1302 (sp->tbuf = (uint8*) _TIFFmalloc(sp->tbuflen * sizeof (int16))) == NULL) {
1303 TIFFErrorExt(tif->tif_clientdata, module, "No space for SGILog translation buffer");
1304 return (0);
1305 }
1306 return (1);
1307 }
1308
1309 static int
LogLuvGuessDataFmt(TIFFDirectory * td)1310 LogLuvGuessDataFmt(TIFFDirectory *td)
1311 {
1312 int guess;
1313
1314 /*
1315 * If the user didn't tell us their datafmt,
1316 * take our best guess from the bitspersample.
1317 */
1318 #define PACK(a,b) (((a)<<3)|(b))
1319 switch (PACK(td->td_bitspersample, td->td_sampleformat)) {
1320 case PACK(32, SAMPLEFORMAT_IEEEFP):
1321 guess = SGILOGDATAFMT_FLOAT;
1322 break;
1323 case PACK(32, SAMPLEFORMAT_VOID):
1324 case PACK(32, SAMPLEFORMAT_UINT):
1325 case PACK(32, SAMPLEFORMAT_INT):
1326 guess = SGILOGDATAFMT_RAW;
1327 break;
1328 case PACK(16, SAMPLEFORMAT_VOID):
1329 case PACK(16, SAMPLEFORMAT_INT):
1330 case PACK(16, SAMPLEFORMAT_UINT):
1331 guess = SGILOGDATAFMT_16BIT;
1332 break;
1333 case PACK( 8, SAMPLEFORMAT_VOID):
1334 case PACK( 8, SAMPLEFORMAT_UINT):
1335 guess = SGILOGDATAFMT_8BIT;
1336 break;
1337 default:
1338 guess = SGILOGDATAFMT_UNKNOWN;
1339 break;
1340 #undef PACK
1341 }
1342 /*
1343 * Double-check samples per pixel.
1344 */
1345 switch (td->td_samplesperpixel) {
1346 case 1:
1347 if (guess != SGILOGDATAFMT_RAW)
1348 guess = SGILOGDATAFMT_UNKNOWN;
1349 break;
1350 case 3:
1351 if (guess == SGILOGDATAFMT_RAW)
1352 guess = SGILOGDATAFMT_UNKNOWN;
1353 break;
1354 default:
1355 guess = SGILOGDATAFMT_UNKNOWN;
1356 break;
1357 }
1358 return (guess);
1359 }
1360
1361 static int
LogLuvInitState(TIFF * tif)1362 LogLuvInitState(TIFF* tif)
1363 {
1364 static const char module[] = "LogLuvInitState";
1365 TIFFDirectory* td = &tif->tif_dir;
1366 LogLuvState* sp = DecoderState(tif);
1367
1368 assert(sp != NULL);
1369 assert(td->td_photometric == PHOTOMETRIC_LOGLUV);
1370
1371 /* for some reason, we can't do this in TIFFInitLogLuv */
1372 if (td->td_planarconfig != PLANARCONFIG_CONTIG) {
1373 TIFFErrorExt(tif->tif_clientdata, module,
1374 "SGILog compression cannot handle non-contiguous data");
1375 return (0);
1376 }
1377 if (sp->user_datafmt == SGILOGDATAFMT_UNKNOWN)
1378 sp->user_datafmt = LogLuvGuessDataFmt(td);
1379 switch (sp->user_datafmt) {
1380 case SGILOGDATAFMT_FLOAT:
1381 sp->pixel_size = 3*sizeof (float);
1382 break;
1383 case SGILOGDATAFMT_16BIT:
1384 sp->pixel_size = 3*sizeof (int16);
1385 break;
1386 case SGILOGDATAFMT_RAW:
1387 sp->pixel_size = sizeof (uint32);
1388 break;
1389 case SGILOGDATAFMT_8BIT:
1390 sp->pixel_size = 3*sizeof (uint8);
1391 break;
1392 default:
1393 TIFFErrorExt(tif->tif_clientdata, module,
1394 "No support for converting user data format to LogLuv");
1395 return (0);
1396 }
1397 if( isTiled(tif) )
1398 sp->tbuflen = multiply_ms(td->td_tilewidth, td->td_tilelength);
1399 else
1400 sp->tbuflen = multiply_ms(td->td_imagewidth, td->td_rowsperstrip);
1401 if (multiply_ms(sp->tbuflen, sizeof (uint32)) == 0 ||
1402 (sp->tbuf = (uint8*) _TIFFmalloc(sp->tbuflen * sizeof (uint32))) == NULL) {
1403 TIFFErrorExt(tif->tif_clientdata, module, "No space for SGILog translation buffer");
1404 return (0);
1405 }
1406 return (1);
1407 }
1408
1409 static int
LogLuvFixupTags(TIFF * tif)1410 LogLuvFixupTags(TIFF* tif)
1411 {
1412 (void) tif;
1413 return (1);
1414 }
1415
1416 static int
LogLuvSetupDecode(TIFF * tif)1417 LogLuvSetupDecode(TIFF* tif)
1418 {
1419 static const char module[] = "LogLuvSetupDecode";
1420 LogLuvState* sp = DecoderState(tif);
1421 TIFFDirectory* td = &tif->tif_dir;
1422
1423 tif->tif_postdecode = _TIFFNoPostDecode;
1424 switch (td->td_photometric) {
1425 case PHOTOMETRIC_LOGLUV:
1426 if (!LogLuvInitState(tif))
1427 break;
1428 if (td->td_compression == COMPRESSION_SGILOG24) {
1429 tif->tif_decoderow = LogLuvDecode24;
1430 switch (sp->user_datafmt) {
1431 case SGILOGDATAFMT_FLOAT:
1432 sp->tfunc = Luv24toXYZ;
1433 break;
1434 case SGILOGDATAFMT_16BIT:
1435 sp->tfunc = Luv24toLuv48;
1436 break;
1437 case SGILOGDATAFMT_8BIT:
1438 sp->tfunc = Luv24toRGB;
1439 break;
1440 }
1441 } else {
1442 tif->tif_decoderow = LogLuvDecode32;
1443 switch (sp->user_datafmt) {
1444 case SGILOGDATAFMT_FLOAT:
1445 sp->tfunc = Luv32toXYZ;
1446 break;
1447 case SGILOGDATAFMT_16BIT:
1448 sp->tfunc = Luv32toLuv48;
1449 break;
1450 case SGILOGDATAFMT_8BIT:
1451 sp->tfunc = Luv32toRGB;
1452 break;
1453 }
1454 }
1455 return (1);
1456 case PHOTOMETRIC_LOGL:
1457 if (!LogL16InitState(tif))
1458 break;
1459 tif->tif_decoderow = LogL16Decode;
1460 switch (sp->user_datafmt) {
1461 case SGILOGDATAFMT_FLOAT:
1462 sp->tfunc = L16toY;
1463 break;
1464 case SGILOGDATAFMT_8BIT:
1465 sp->tfunc = L16toGry;
1466 break;
1467 }
1468 return (1);
1469 default:
1470 TIFFErrorExt(tif->tif_clientdata, module,
1471 "Inappropriate photometric interpretation %d for SGILog compression; %s",
1472 td->td_photometric, "must be either LogLUV or LogL");
1473 break;
1474 }
1475 return (0);
1476 }
1477
1478 static int
LogLuvSetupEncode(TIFF * tif)1479 LogLuvSetupEncode(TIFF* tif)
1480 {
1481 static const char module[] = "LogLuvSetupEncode";
1482 LogLuvState* sp = EncoderState(tif);
1483 TIFFDirectory* td = &tif->tif_dir;
1484
1485 switch (td->td_photometric) {
1486 case PHOTOMETRIC_LOGLUV:
1487 if (!LogLuvInitState(tif))
1488 break;
1489 if (td->td_compression == COMPRESSION_SGILOG24) {
1490 tif->tif_encoderow = LogLuvEncode24;
1491 switch (sp->user_datafmt) {
1492 case SGILOGDATAFMT_FLOAT:
1493 sp->tfunc = Luv24fromXYZ;
1494 break;
1495 case SGILOGDATAFMT_16BIT:
1496 sp->tfunc = Luv24fromLuv48;
1497 break;
1498 case SGILOGDATAFMT_RAW:
1499 break;
1500 default:
1501 goto notsupported;
1502 }
1503 } else {
1504 tif->tif_encoderow = LogLuvEncode32;
1505 switch (sp->user_datafmt) {
1506 case SGILOGDATAFMT_FLOAT:
1507 sp->tfunc = Luv32fromXYZ;
1508 break;
1509 case SGILOGDATAFMT_16BIT:
1510 sp->tfunc = Luv32fromLuv48;
1511 break;
1512 case SGILOGDATAFMT_RAW:
1513 break;
1514 default:
1515 goto notsupported;
1516 }
1517 }
1518 break;
1519 case PHOTOMETRIC_LOGL:
1520 if (!LogL16InitState(tif))
1521 break;
1522 tif->tif_encoderow = LogL16Encode;
1523 switch (sp->user_datafmt) {
1524 case SGILOGDATAFMT_FLOAT:
1525 sp->tfunc = L16fromY;
1526 break;
1527 case SGILOGDATAFMT_16BIT:
1528 break;
1529 default:
1530 goto notsupported;
1531 }
1532 break;
1533 default:
1534 TIFFErrorExt(tif->tif_clientdata, module,
1535 "Inappropriate photometric interpretation %d for SGILog compression; %s",
1536 td->td_photometric, "must be either LogLUV or LogL");
1537 break;
1538 }
1539 return (1);
1540 notsupported:
1541 TIFFErrorExt(tif->tif_clientdata, module,
1542 "SGILog compression supported only for %s, or raw data",
1543 td->td_photometric == PHOTOMETRIC_LOGL ? "Y, L" : "XYZ, Luv");
1544 return (0);
1545 }
1546
1547 static void
LogLuvClose(TIFF * tif)1548 LogLuvClose(TIFF* tif)
1549 {
1550 TIFFDirectory *td = &tif->tif_dir;
1551
1552 /*
1553 * For consistency, we always want to write out the same
1554 * bitspersample and sampleformat for our TIFF file,
1555 * regardless of the data format being used by the application.
1556 * Since this routine is called after tags have been set but
1557 * before they have been recorded in the file, we reset them here.
1558 */
1559 td->td_samplesperpixel =
1560 (td->td_photometric == PHOTOMETRIC_LOGL) ? 1 : 3;
1561 td->td_bitspersample = 16;
1562 td->td_sampleformat = SAMPLEFORMAT_INT;
1563 }
1564
1565 static void
LogLuvCleanup(TIFF * tif)1566 LogLuvCleanup(TIFF* tif)
1567 {
1568 LogLuvState* sp = (LogLuvState *)tif->tif_data;
1569
1570 assert(sp != 0);
1571
1572 tif->tif_tagmethods.vgetfield = sp->vgetparent;
1573 tif->tif_tagmethods.vsetfield = sp->vsetparent;
1574
1575 if (sp->tbuf)
1576 _TIFFfree(sp->tbuf);
1577 _TIFFfree(sp);
1578 tif->tif_data = NULL;
1579
1580 _TIFFSetDefaultCompressionState(tif);
1581 }
1582
1583 static int
LogLuvVSetField(TIFF * tif,uint32 tag,va_list ap)1584 LogLuvVSetField(TIFF* tif, uint32 tag, va_list ap)
1585 {
1586 static const char module[] = "LogLuvVSetField";
1587 LogLuvState* sp = DecoderState(tif);
1588 int bps, fmt;
1589
1590 switch (tag) {
1591 case TIFFTAG_SGILOGDATAFMT:
1592 sp->user_datafmt = (int) va_arg(ap, int);
1593 /*
1594 * Tweak the TIFF header so that the rest of libtiff knows what
1595 * size of data will be passed between app and library, and
1596 * assume that the app knows what it is doing and is not
1597 * confused by these header manipulations...
1598 */
1599 switch (sp->user_datafmt) {
1600 case SGILOGDATAFMT_FLOAT:
1601 bps = 32, fmt = SAMPLEFORMAT_IEEEFP;
1602 break;
1603 case SGILOGDATAFMT_16BIT:
1604 bps = 16, fmt = SAMPLEFORMAT_INT;
1605 break;
1606 case SGILOGDATAFMT_RAW:
1607 bps = 32, fmt = SAMPLEFORMAT_UINT;
1608 TIFFSetField(tif, TIFFTAG_SAMPLESPERPIXEL, 1);
1609 break;
1610 case SGILOGDATAFMT_8BIT:
1611 bps = 8, fmt = SAMPLEFORMAT_UINT;
1612 break;
1613 default:
1614 TIFFErrorExt(tif->tif_clientdata, tif->tif_name,
1615 "Unknown data format %d for LogLuv compression",
1616 sp->user_datafmt);
1617 return (0);
1618 }
1619 TIFFSetField(tif, TIFFTAG_BITSPERSAMPLE, bps);
1620 TIFFSetField(tif, TIFFTAG_SAMPLEFORMAT, fmt);
1621 /*
1622 * Must recalculate sizes should bits/sample change.
1623 */
1624 tif->tif_tilesize = isTiled(tif) ? TIFFTileSize(tif) : (tmsize_t) -1;
1625 tif->tif_scanlinesize = TIFFScanlineSize(tif);
1626 return (1);
1627 case TIFFTAG_SGILOGENCODE:
1628 sp->encode_meth = (int) va_arg(ap, int);
1629 if (sp->encode_meth != SGILOGENCODE_NODITHER &&
1630 sp->encode_meth != SGILOGENCODE_RANDITHER) {
1631 TIFFErrorExt(tif->tif_clientdata, module,
1632 "Unknown encoding %d for LogLuv compression",
1633 sp->encode_meth);
1634 return (0);
1635 }
1636 return (1);
1637 default:
1638 return (*sp->vsetparent)(tif, tag, ap);
1639 }
1640 }
1641
1642 static int
LogLuvVGetField(TIFF * tif,uint32 tag,va_list ap)1643 LogLuvVGetField(TIFF* tif, uint32 tag, va_list ap)
1644 {
1645 LogLuvState *sp = (LogLuvState *)tif->tif_data;
1646
1647 switch (tag) {
1648 case TIFFTAG_SGILOGDATAFMT:
1649 *va_arg(ap, int*) = sp->user_datafmt;
1650 return (1);
1651 default:
1652 return (*sp->vgetparent)(tif, tag, ap);
1653 }
1654 }
1655
1656 static const TIFFField LogLuvFields[] = {
1657 { TIFFTAG_SGILOGDATAFMT, 0, 0, TIFF_SHORT, 0, TIFF_SETGET_INT, TIFF_SETGET_UNDEFINED, FIELD_PSEUDO, TRUE, FALSE, "SGILogDataFmt", NULL},
1658 { TIFFTAG_SGILOGENCODE, 0, 0, TIFF_SHORT, 0, TIFF_SETGET_INT, TIFF_SETGET_UNDEFINED, FIELD_PSEUDO, TRUE, FALSE, "SGILogEncode", NULL}
1659 };
1660
1661 int
TIFFInitSGILog(TIFF * tif,int scheme)1662 TIFFInitSGILog(TIFF* tif, int scheme)
1663 {
1664 static const char module[] = "TIFFInitSGILog";
1665 LogLuvState* sp;
1666
1667 assert(scheme == COMPRESSION_SGILOG24 || scheme == COMPRESSION_SGILOG);
1668
1669 /*
1670 * Merge codec-specific tag information.
1671 */
1672 if (!_TIFFMergeFields(tif, LogLuvFields,
1673 TIFFArrayCount(LogLuvFields))) {
1674 TIFFErrorExt(tif->tif_clientdata, module,
1675 "Merging SGILog codec-specific tags failed");
1676 return 0;
1677 }
1678
1679 /*
1680 * Allocate state block so tag methods have storage to record values.
1681 */
1682 tif->tif_data = (uint8*) _TIFFmalloc(sizeof (LogLuvState));
1683 if (tif->tif_data == NULL)
1684 goto bad;
1685 sp = (LogLuvState*) tif->tif_data;
1686 _TIFFmemset((void*)sp, 0, sizeof (*sp));
1687 sp->user_datafmt = SGILOGDATAFMT_UNKNOWN;
1688 sp->encode_meth = (scheme == COMPRESSION_SGILOG24) ?
1689 SGILOGENCODE_RANDITHER : SGILOGENCODE_NODITHER;
1690 sp->tfunc = _logLuvNop;
1691
1692 /*
1693 * Install codec methods.
1694 * NB: tif_decoderow & tif_encoderow are filled
1695 * in at setup time.
1696 */
1697 tif->tif_fixuptags = LogLuvFixupTags;
1698 tif->tif_setupdecode = LogLuvSetupDecode;
1699 tif->tif_decodestrip = LogLuvDecodeStrip;
1700 tif->tif_decodetile = LogLuvDecodeTile;
1701 tif->tif_setupencode = LogLuvSetupEncode;
1702 tif->tif_encodestrip = LogLuvEncodeStrip;
1703 tif->tif_encodetile = LogLuvEncodeTile;
1704 tif->tif_close = LogLuvClose;
1705 tif->tif_cleanup = LogLuvCleanup;
1706
1707 /*
1708 * Override parent get/set field methods.
1709 */
1710 sp->vgetparent = tif->tif_tagmethods.vgetfield;
1711 tif->tif_tagmethods.vgetfield = LogLuvVGetField; /* hook for codec tags */
1712 sp->vsetparent = tif->tif_tagmethods.vsetfield;
1713 tif->tif_tagmethods.vsetfield = LogLuvVSetField; /* hook for codec tags */
1714
1715 return (1);
1716 bad:
1717 TIFFErrorExt(tif->tif_clientdata, module,
1718 "%s: No space for LogLuv state block", tif->tif_name);
1719 return (0);
1720 }
1721 #endif /* LOGLUV_SUPPORT */
1722
1723 /* vim: set ts=8 sts=8 sw=8 noet: */
1724 /*
1725 * Local Variables:
1726 * mode: c
1727 * c-basic-offset: 8
1728 * fill-column: 78
1729 * End:
1730 */
1731