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 assert(sp->tbuflen >= npixels);
206 tp = (int16*) sp->tbuf;
207 }
208 _TIFFmemset((void*) tp, 0, npixels*sizeof (tp[0]));
209
210 bp = (unsigned char*) tif->tif_rawcp;
211 cc = tif->tif_rawcc;
212 /* get each byte string */
213 for (shft = 2*8; (shft -= 8) >= 0; ) {
214 for (i = 0; i < npixels && cc > 0; )
215 if (*bp >= 128) { /* run */
216 rc = *bp++ + (2-128); /* TODO: potential input buffer overrun when decoding corrupt or truncated data */
217 b = (int16)(*bp++ << shft);
218 cc -= 2;
219 while (rc-- && i < npixels)
220 tp[i++] |= b;
221 } else { /* non-run */
222 rc = *bp++; /* nul is noop */
223 while (--cc && rc-- && i < npixels)
224 tp[i++] |= (int16)*bp++ << shft;
225 }
226 if (i != npixels) {
227 #if defined(__WIN32__) && (defined(_MSC_VER) || defined(__MINGW32__))
228 TIFFErrorExt(tif->tif_clientdata, module,
229 "Not enough data at row %lu (short %I64d pixels)",
230 (unsigned long) tif->tif_row,
231 (unsigned __int64) (npixels - i));
232 #else
233 TIFFErrorExt(tif->tif_clientdata, module,
234 "Not enough data at row %lu (short %llu pixels)",
235 (unsigned long) tif->tif_row,
236 (unsigned long long) (npixels - i));
237 #endif
238 tif->tif_rawcp = (uint8*) bp;
239 tif->tif_rawcc = cc;
240 return (0);
241 }
242 }
243 (*sp->tfunc)(sp, op, npixels);
244 tif->tif_rawcp = (uint8*) bp;
245 tif->tif_rawcc = cc;
246 return (1);
247 }
248
249 /*
250 * Decode a string of 24-bit pixels.
251 */
252 static int
LogLuvDecode24(TIFF * tif,uint8 * op,tmsize_t occ,uint16 s)253 LogLuvDecode24(TIFF* tif, uint8* op, tmsize_t occ, uint16 s)
254 {
255 static const char module[] = "LogLuvDecode24";
256 LogLuvState* sp = DecoderState(tif);
257 tmsize_t cc;
258 tmsize_t i;
259 tmsize_t npixels;
260 unsigned char* bp;
261 uint32* tp;
262
263 assert(s == 0);
264 assert(sp != NULL);
265
266 npixels = occ / sp->pixel_size;
267
268 if (sp->user_datafmt == SGILOGDATAFMT_RAW)
269 tp = (uint32 *)op;
270 else {
271 assert(sp->tbuflen >= npixels);
272 tp = (uint32 *) sp->tbuf;
273 }
274 /* copy to array of uint32 */
275 bp = (unsigned char*) tif->tif_rawcp;
276 cc = tif->tif_rawcc;
277 for (i = 0; i < npixels && cc > 0; i++) {
278 tp[i] = bp[0] << 16 | bp[1] << 8 | bp[2];
279 bp += 3;
280 cc -= 3;
281 }
282 tif->tif_rawcp = (uint8*) bp;
283 tif->tif_rawcc = cc;
284 if (i != npixels) {
285 #if defined(__WIN32__) && (defined(_MSC_VER) || defined(__MINGW32__))
286 TIFFErrorExt(tif->tif_clientdata, module,
287 "Not enough data at row %lu (short %I64d pixels)",
288 (unsigned long) tif->tif_row,
289 (unsigned __int64) (npixels - i));
290 #else
291 TIFFErrorExt(tif->tif_clientdata, module,
292 "Not enough data at row %lu (short %llu pixels)",
293 (unsigned long) tif->tif_row,
294 (unsigned long long) (npixels - i));
295 #endif
296 return (0);
297 }
298 (*sp->tfunc)(sp, op, npixels);
299 return (1);
300 }
301
302 /*
303 * Decode a string of 32-bit pixels.
304 */
305 static int
LogLuvDecode32(TIFF * tif,uint8 * op,tmsize_t occ,uint16 s)306 LogLuvDecode32(TIFF* tif, uint8* op, tmsize_t occ, uint16 s)
307 {
308 static const char module[] = "LogLuvDecode32";
309 LogLuvState* sp;
310 int shft;
311 tmsize_t i;
312 tmsize_t npixels;
313 unsigned char* bp;
314 uint32* tp;
315 uint32 b;
316 tmsize_t cc;
317 int rc;
318
319 assert(s == 0);
320 sp = DecoderState(tif);
321 assert(sp != NULL);
322
323 npixels = occ / sp->pixel_size;
324
325 if (sp->user_datafmt == SGILOGDATAFMT_RAW)
326 tp = (uint32*) op;
327 else {
328 assert(sp->tbuflen >= npixels);
329 tp = (uint32*) sp->tbuf;
330 }
331 _TIFFmemset((void*) tp, 0, npixels*sizeof (tp[0]));
332
333 bp = (unsigned char*) tif->tif_rawcp;
334 cc = tif->tif_rawcc;
335 /* get each byte string */
336 for (shft = 4*8; (shft -= 8) >= 0; ) {
337 for (i = 0; i < npixels && cc > 0; )
338 if (*bp >= 128) { /* run */
339 rc = *bp++ + (2-128);
340 b = (uint32)*bp++ << shft;
341 cc -= 2; /* TODO: potential input buffer overrun when decoding corrupt or truncated data */
342 while (rc-- && i < npixels)
343 tp[i++] |= b;
344 } else { /* non-run */
345 rc = *bp++; /* nul is noop */
346 while (--cc && rc-- && i < npixels)
347 tp[i++] |= (uint32)*bp++ << shft;
348 }
349 if (i != npixels) {
350 #if defined(__WIN32__) && (defined(_MSC_VER) || defined(__MINGW32__))
351 TIFFErrorExt(tif->tif_clientdata, module,
352 "Not enough data at row %lu (short %I64d pixels)",
353 (unsigned long) tif->tif_row,
354 (unsigned __int64) (npixels - i));
355 #else
356 TIFFErrorExt(tif->tif_clientdata, module,
357 "Not enough data at row %lu (short %llu pixels)",
358 (unsigned long) tif->tif_row,
359 (unsigned long long) (npixels - i));
360 #endif
361 tif->tif_rawcp = (uint8*) bp;
362 tif->tif_rawcc = cc;
363 return (0);
364 }
365 }
366 (*sp->tfunc)(sp, op, npixels);
367 tif->tif_rawcp = (uint8*) bp;
368 tif->tif_rawcc = cc;
369 return (1);
370 }
371
372 /*
373 * Decode a strip of pixels. We break it into rows to
374 * maintain synchrony with the encode algorithm, which
375 * is row by row.
376 */
377 static int
LogLuvDecodeStrip(TIFF * tif,uint8 * bp,tmsize_t cc,uint16 s)378 LogLuvDecodeStrip(TIFF* tif, uint8* bp, tmsize_t cc, uint16 s)
379 {
380 tmsize_t rowlen = TIFFScanlineSize(tif);
381
382 if (rowlen == 0)
383 return 0;
384
385 assert(cc%rowlen == 0);
386 while (cc && (*tif->tif_decoderow)(tif, bp, rowlen, s))
387 bp += rowlen, cc -= rowlen;
388 return (cc == 0);
389 }
390
391 /*
392 * Decode a tile of pixels. We break it into rows to
393 * maintain synchrony with the encode algorithm, which
394 * is row by row.
395 */
396 static int
LogLuvDecodeTile(TIFF * tif,uint8 * bp,tmsize_t cc,uint16 s)397 LogLuvDecodeTile(TIFF* tif, uint8* bp, tmsize_t cc, uint16 s)
398 {
399 tmsize_t rowlen = TIFFTileRowSize(tif);
400
401 if (rowlen == 0)
402 return 0;
403
404 assert(cc%rowlen == 0);
405 while (cc && (*tif->tif_decoderow)(tif, bp, rowlen, s))
406 bp += rowlen, cc -= rowlen;
407 return (cc == 0);
408 }
409
410 /*
411 * Encode a row of 16-bit pixels.
412 */
413 static int
LogL16Encode(TIFF * tif,uint8 * bp,tmsize_t cc,uint16 s)414 LogL16Encode(TIFF* tif, uint8* bp, tmsize_t cc, uint16 s)
415 {
416 LogLuvState* sp = EncoderState(tif);
417 int shft;
418 tmsize_t i;
419 tmsize_t j;
420 tmsize_t npixels;
421 uint8* op;
422 int16* tp;
423 int16 b;
424 tmsize_t occ;
425 int rc=0, mask;
426 tmsize_t beg;
427
428 assert(s == 0);
429 assert(sp != NULL);
430 npixels = cc / sp->pixel_size;
431
432 if (sp->user_datafmt == SGILOGDATAFMT_16BIT)
433 tp = (int16*) bp;
434 else {
435 tp = (int16*) sp->tbuf;
436 assert(sp->tbuflen >= npixels);
437 (*sp->tfunc)(sp, bp, npixels);
438 }
439 /* compress each byte string */
440 op = tif->tif_rawcp;
441 occ = tif->tif_rawdatasize - tif->tif_rawcc;
442 for (shft = 2*8; (shft -= 8) >= 0; )
443 for (i = 0; i < npixels; i += rc) {
444 if (occ < 4) {
445 tif->tif_rawcp = op;
446 tif->tif_rawcc = tif->tif_rawdatasize - occ;
447 if (!TIFFFlushData1(tif))
448 return (-1);
449 op = tif->tif_rawcp;
450 occ = tif->tif_rawdatasize - tif->tif_rawcc;
451 }
452 mask = 0xff << shft; /* find next run */
453 for (beg = i; beg < npixels; beg += rc) {
454 b = (int16) (tp[beg] & mask);
455 rc = 1;
456 while (rc < 127+2 && beg+rc < npixels &&
457 (tp[beg+rc] & mask) == b)
458 rc++;
459 if (rc >= MINRUN)
460 break; /* long enough */
461 }
462 if (beg-i > 1 && beg-i < MINRUN) {
463 b = (int16) (tp[i] & mask);/*check short run */
464 j = i+1;
465 while ((tp[j++] & mask) == b)
466 if (j == beg) {
467 *op++ = (uint8)(128-2+j-i);
468 *op++ = (uint8)(b >> shft);
469 occ -= 2;
470 i = beg;
471 break;
472 }
473 }
474 while (i < beg) { /* write out non-run */
475 if ((j = beg-i) > 127) j = 127;
476 if (occ < j+3) {
477 tif->tif_rawcp = op;
478 tif->tif_rawcc = tif->tif_rawdatasize - occ;
479 if (!TIFFFlushData1(tif))
480 return (-1);
481 op = tif->tif_rawcp;
482 occ = tif->tif_rawdatasize - tif->tif_rawcc;
483 }
484 *op++ = (uint8) j; occ--;
485 while (j--) {
486 *op++ = (uint8) (tp[i++] >> shft & 0xff);
487 occ--;
488 }
489 }
490 if (rc >= MINRUN) { /* write out run */
491 *op++ = (uint8) (128-2+rc);
492 *op++ = (uint8) (tp[beg] >> shft & 0xff);
493 occ -= 2;
494 } else
495 rc = 0;
496 }
497 tif->tif_rawcp = op;
498 tif->tif_rawcc = tif->tif_rawdatasize - occ;
499
500 return (1);
501 }
502
503 /*
504 * Encode a row of 24-bit pixels.
505 */
506 static int
LogLuvEncode24(TIFF * tif,uint8 * bp,tmsize_t cc,uint16 s)507 LogLuvEncode24(TIFF* tif, uint8* bp, tmsize_t cc, uint16 s)
508 {
509 LogLuvState* sp = EncoderState(tif);
510 tmsize_t i;
511 tmsize_t npixels;
512 tmsize_t occ;
513 uint8* op;
514 uint32* tp;
515
516 assert(s == 0);
517 assert(sp != NULL);
518 npixels = cc / sp->pixel_size;
519
520 if (sp->user_datafmt == SGILOGDATAFMT_RAW)
521 tp = (uint32*) bp;
522 else {
523 tp = (uint32*) sp->tbuf;
524 assert(sp->tbuflen >= npixels);
525 (*sp->tfunc)(sp, bp, npixels);
526 }
527 /* write out encoded pixels */
528 op = tif->tif_rawcp;
529 occ = tif->tif_rawdatasize - tif->tif_rawcc;
530 for (i = npixels; i--; ) {
531 if (occ < 3) {
532 tif->tif_rawcp = op;
533 tif->tif_rawcc = tif->tif_rawdatasize - occ;
534 if (!TIFFFlushData1(tif))
535 return (-1);
536 op = tif->tif_rawcp;
537 occ = tif->tif_rawdatasize - tif->tif_rawcc;
538 }
539 *op++ = (uint8)(*tp >> 16);
540 *op++ = (uint8)(*tp >> 8 & 0xff);
541 *op++ = (uint8)(*tp++ & 0xff);
542 occ -= 3;
543 }
544 tif->tif_rawcp = op;
545 tif->tif_rawcc = tif->tif_rawdatasize - occ;
546
547 return (1);
548 }
549
550 /*
551 * Encode a row of 32-bit pixels.
552 */
553 static int
LogLuvEncode32(TIFF * tif,uint8 * bp,tmsize_t cc,uint16 s)554 LogLuvEncode32(TIFF* tif, uint8* bp, tmsize_t cc, uint16 s)
555 {
556 LogLuvState* sp = EncoderState(tif);
557 int shft;
558 tmsize_t i;
559 tmsize_t j;
560 tmsize_t npixels;
561 uint8* op;
562 uint32* tp;
563 uint32 b;
564 tmsize_t occ;
565 int rc=0, mask;
566 tmsize_t beg;
567
568 assert(s == 0);
569 assert(sp != NULL);
570
571 npixels = cc / sp->pixel_size;
572
573 if (sp->user_datafmt == SGILOGDATAFMT_RAW)
574 tp = (uint32*) bp;
575 else {
576 tp = (uint32*) sp->tbuf;
577 assert(sp->tbuflen >= npixels);
578 (*sp->tfunc)(sp, bp, npixels);
579 }
580 /* compress each byte string */
581 op = tif->tif_rawcp;
582 occ = tif->tif_rawdatasize - tif->tif_rawcc;
583 for (shft = 4*8; (shft -= 8) >= 0; )
584 for (i = 0; i < npixels; i += rc) {
585 if (occ < 4) {
586 tif->tif_rawcp = op;
587 tif->tif_rawcc = tif->tif_rawdatasize - occ;
588 if (!TIFFFlushData1(tif))
589 return (-1);
590 op = tif->tif_rawcp;
591 occ = tif->tif_rawdatasize - tif->tif_rawcc;
592 }
593 mask = 0xff << shft; /* find next run */
594 for (beg = i; beg < npixels; beg += rc) {
595 b = tp[beg] & mask;
596 rc = 1;
597 while (rc < 127+2 && beg+rc < npixels &&
598 (tp[beg+rc] & mask) == b)
599 rc++;
600 if (rc >= MINRUN)
601 break; /* long enough */
602 }
603 if (beg-i > 1 && beg-i < MINRUN) {
604 b = tp[i] & mask; /* check short run */
605 j = i+1;
606 while ((tp[j++] & mask) == b)
607 if (j == beg) {
608 *op++ = (uint8)(128-2+j-i);
609 *op++ = (uint8)(b >> shft);
610 occ -= 2;
611 i = beg;
612 break;
613 }
614 }
615 while (i < beg) { /* write out non-run */
616 if ((j = beg-i) > 127) j = 127;
617 if (occ < j+3) {
618 tif->tif_rawcp = op;
619 tif->tif_rawcc = tif->tif_rawdatasize - occ;
620 if (!TIFFFlushData1(tif))
621 return (-1);
622 op = tif->tif_rawcp;
623 occ = tif->tif_rawdatasize - tif->tif_rawcc;
624 }
625 *op++ = (uint8) j; occ--;
626 while (j--) {
627 *op++ = (uint8)(tp[i++] >> shft & 0xff);
628 occ--;
629 }
630 }
631 if (rc >= MINRUN) { /* write out run */
632 *op++ = (uint8) (128-2+rc);
633 *op++ = (uint8)(tp[beg] >> shft & 0xff);
634 occ -= 2;
635 } else
636 rc = 0;
637 }
638 tif->tif_rawcp = op;
639 tif->tif_rawcc = tif->tif_rawdatasize - occ;
640
641 return (1);
642 }
643
644 /*
645 * Encode a strip of pixels. We break it into rows to
646 * avoid encoding runs across row boundaries.
647 */
648 static int
LogLuvEncodeStrip(TIFF * tif,uint8 * bp,tmsize_t cc,uint16 s)649 LogLuvEncodeStrip(TIFF* tif, uint8* bp, tmsize_t cc, uint16 s)
650 {
651 tmsize_t rowlen = TIFFScanlineSize(tif);
652
653 if (rowlen == 0)
654 return 0;
655
656 assert(cc%rowlen == 0);
657 while (cc && (*tif->tif_encoderow)(tif, bp, rowlen, s) == 1)
658 bp += rowlen, cc -= rowlen;
659 return (cc == 0);
660 }
661
662 /*
663 * Encode a tile of pixels. We break it into rows to
664 * avoid encoding runs across row boundaries.
665 */
666 static int
LogLuvEncodeTile(TIFF * tif,uint8 * bp,tmsize_t cc,uint16 s)667 LogLuvEncodeTile(TIFF* tif, uint8* bp, tmsize_t cc, uint16 s)
668 {
669 tmsize_t rowlen = TIFFTileRowSize(tif);
670
671 if (rowlen == 0)
672 return 0;
673
674 assert(cc%rowlen == 0);
675 while (cc && (*tif->tif_encoderow)(tif, bp, rowlen, s) == 1)
676 bp += rowlen, cc -= rowlen;
677 return (cc == 0);
678 }
679
680 /*
681 * Encode/Decode functions for converting to and from user formats.
682 */
683
684 #include "uvcode.h"
685
686 #ifndef UVSCALE
687 #define U_NEU 0.210526316
688 #define V_NEU 0.473684211
689 #define UVSCALE 410.
690 #endif
691
692 #ifndef M_LN2
693 #define M_LN2 0.69314718055994530942
694 #endif
695 #ifndef M_PI
696 #define M_PI 3.14159265358979323846
697 #endif
698 #undef log2 /* Conflict with C'99 function */
699 #define log2(x) ((1./M_LN2)*log(x))
700 #undef exp2 /* Conflict with C'99 function */
701 #define exp2(x) exp(M_LN2*(x))
702
703 #define itrunc(x,m) ((m)==SGILOGENCODE_NODITHER ? \
704 (int)(x) : \
705 (int)((x) + rand()*(1./RAND_MAX) - .5))
706
707 #if !LOGLUV_PUBLIC
708 static
709 #endif
710 double
LogL16toY(int p16)711 LogL16toY(int p16) /* compute luminance from 16-bit LogL */
712 {
713 int Le = p16 & 0x7fff;
714 double Y;
715
716 if (!Le)
717 return (0.);
718 Y = exp(M_LN2/256.*(Le+.5) - M_LN2*64.);
719 return (!(p16 & 0x8000) ? Y : -Y);
720 }
721
722 #if !LOGLUV_PUBLIC
723 static
724 #endif
725 int
LogL16fromY(double Y,int em)726 LogL16fromY(double Y, int em) /* get 16-bit LogL from Y */
727 {
728 if (Y >= 1.8371976e19)
729 return (0x7fff);
730 if (Y <= -1.8371976e19)
731 return (0xffff);
732 if (Y > 5.4136769e-20)
733 return itrunc(256.*(log2(Y) + 64.), em);
734 if (Y < -5.4136769e-20)
735 return (~0x7fff | itrunc(256.*(log2(-Y) + 64.), em));
736 return (0);
737 }
738
739 static void
L16toY(LogLuvState * sp,uint8 * op,tmsize_t n)740 L16toY(LogLuvState* sp, uint8* op, tmsize_t n)
741 {
742 int16* l16 = (int16*) sp->tbuf;
743 float* yp = (float*) op;
744
745 while (n-- > 0)
746 *yp++ = (float)LogL16toY(*l16++);
747 }
748
749 static void
L16toGry(LogLuvState * sp,uint8 * op,tmsize_t n)750 L16toGry(LogLuvState* sp, uint8* op, tmsize_t n)
751 {
752 int16* l16 = (int16*) sp->tbuf;
753 uint8* gp = (uint8*) op;
754
755 while (n-- > 0) {
756 double Y = LogL16toY(*l16++);
757 *gp++ = (uint8) ((Y <= 0.) ? 0 : (Y >= 1.) ? 255 : (int)(256.*sqrt(Y)));
758 }
759 }
760
761 static void
L16fromY(LogLuvState * sp,uint8 * op,tmsize_t n)762 L16fromY(LogLuvState* sp, uint8* op, tmsize_t n)
763 {
764 int16* l16 = (int16*) sp->tbuf;
765 float* yp = (float*) op;
766
767 while (n-- > 0)
768 *l16++ = (int16) (LogL16fromY(*yp++, sp->encode_meth));
769 }
770
771 #if !LOGLUV_PUBLIC
772 static
773 #endif
774 void
XYZtoRGB24(float xyz[3],uint8 rgb[3])775 XYZtoRGB24(float xyz[3], uint8 rgb[3])
776 {
777 double r, g, b;
778 /* assume CCIR-709 primaries */
779 r = 2.690*xyz[0] + -1.276*xyz[1] + -0.414*xyz[2];
780 g = -1.022*xyz[0] + 1.978*xyz[1] + 0.044*xyz[2];
781 b = 0.061*xyz[0] + -0.224*xyz[1] + 1.163*xyz[2];
782 /* assume 2.0 gamma for speed */
783 /* could use integer sqrt approx., but this is probably faster */
784 rgb[0] = (uint8)((r<=0.) ? 0 : (r >= 1.) ? 255 : (int)(256.*sqrt(r)));
785 rgb[1] = (uint8)((g<=0.) ? 0 : (g >= 1.) ? 255 : (int)(256.*sqrt(g)));
786 rgb[2] = (uint8)((b<=0.) ? 0 : (b >= 1.) ? 255 : (int)(256.*sqrt(b)));
787 }
788
789 #if !LOGLUV_PUBLIC
790 static
791 #endif
792 double
LogL10toY(int p10)793 LogL10toY(int p10) /* compute luminance from 10-bit LogL */
794 {
795 if (p10 == 0)
796 return (0.);
797 return (exp(M_LN2/64.*(p10+.5) - M_LN2*12.));
798 }
799
800 #if !LOGLUV_PUBLIC
801 static
802 #endif
803 int
LogL10fromY(double Y,int em)804 LogL10fromY(double Y, int em) /* get 10-bit LogL from Y */
805 {
806 if (Y >= 15.742)
807 return (0x3ff);
808 else if (Y <= .00024283)
809 return (0);
810 else
811 return itrunc(64.*(log2(Y) + 12.), em);
812 }
813
814 #define NANGLES 100
815 #define uv2ang(u, v) ( (NANGLES*.499999999/M_PI) \
816 * atan2((v)-V_NEU,(u)-U_NEU) + .5*NANGLES )
817
818 static int
oog_encode(double u,double v)819 oog_encode(double u, double v) /* encode out-of-gamut chroma */
820 {
821 static int oog_table[NANGLES];
822 static int initialized = 0;
823 register int i;
824
825 if (!initialized) { /* set up perimeter table */
826 double eps[NANGLES], ua, va, ang, epsa;
827 int ui, vi, ustep;
828 for (i = NANGLES; i--; )
829 eps[i] = 2.;
830 for (vi = UV_NVS; vi--; ) {
831 va = UV_VSTART + (vi+.5)*UV_SQSIZ;
832 ustep = uv_row[vi].nus-1;
833 if (vi == UV_NVS-1 || vi == 0 || ustep <= 0)
834 ustep = 1;
835 for (ui = uv_row[vi].nus-1; ui >= 0; ui -= ustep) {
836 ua = uv_row[vi].ustart + (ui+.5)*UV_SQSIZ;
837 ang = uv2ang(ua, va);
838 i = (int) ang;
839 epsa = fabs(ang - (i+.5));
840 if (epsa < eps[i]) {
841 oog_table[i] = uv_row[vi].ncum + ui;
842 eps[i] = epsa;
843 }
844 }
845 }
846 for (i = NANGLES; i--; ) /* fill any holes */
847 if (eps[i] > 1.5) {
848 int i1, i2;
849 for (i1 = 1; i1 < NANGLES/2; i1++)
850 if (eps[(i+i1)%NANGLES] < 1.5)
851 break;
852 for (i2 = 1; i2 < NANGLES/2; i2++)
853 if (eps[(i+NANGLES-i2)%NANGLES] < 1.5)
854 break;
855 if (i1 < i2)
856 oog_table[i] =
857 oog_table[(i+i1)%NANGLES];
858 else
859 oog_table[i] =
860 oog_table[(i+NANGLES-i2)%NANGLES];
861 }
862 initialized = 1;
863 }
864 i = (int) uv2ang(u, v); /* look up hue angle */
865 return (oog_table[i]);
866 }
867
868 #undef uv2ang
869 #undef NANGLES
870
871 #if !LOGLUV_PUBLIC
872 static
873 #endif
874 int
uv_encode(double u,double v,int em)875 uv_encode(double u, double v, int em) /* encode (u',v') coordinates */
876 {
877 register int vi, ui;
878
879 if (v < UV_VSTART)
880 return oog_encode(u, v);
881 vi = itrunc((v - UV_VSTART)*(1./UV_SQSIZ), em);
882 if (vi >= UV_NVS)
883 return oog_encode(u, v);
884 if (u < uv_row[vi].ustart)
885 return oog_encode(u, v);
886 ui = itrunc((u - uv_row[vi].ustart)*(1./UV_SQSIZ), em);
887 if (ui >= uv_row[vi].nus)
888 return oog_encode(u, v);
889
890 return (uv_row[vi].ncum + ui);
891 }
892
893 #if !LOGLUV_PUBLIC
894 static
895 #endif
896 int
uv_decode(double * up,double * vp,int c)897 uv_decode(double *up, double *vp, int c) /* decode (u',v') index */
898 {
899 int upper, lower;
900 register int ui, vi;
901
902 if (c < 0 || c >= UV_NDIVS)
903 return (-1);
904 lower = 0; /* binary search */
905 upper = UV_NVS;
906 while (upper - lower > 1) {
907 vi = (lower + upper) >> 1;
908 ui = c - uv_row[vi].ncum;
909 if (ui > 0)
910 lower = vi;
911 else if (ui < 0)
912 upper = vi;
913 else {
914 lower = vi;
915 break;
916 }
917 }
918 vi = lower;
919 ui = c - uv_row[vi].ncum;
920 *up = uv_row[vi].ustart + (ui+.5)*UV_SQSIZ;
921 *vp = UV_VSTART + (vi+.5)*UV_SQSIZ;
922 return (0);
923 }
924
925 #if !LOGLUV_PUBLIC
926 static
927 #endif
928 void
LogLuv24toXYZ(uint32 p,float XYZ[3])929 LogLuv24toXYZ(uint32 p, float XYZ[3])
930 {
931 int Ce;
932 double L, u, v, s, x, y;
933 /* decode luminance */
934 L = LogL10toY(p>>14 & 0x3ff);
935 if (L <= 0.) {
936 XYZ[0] = XYZ[1] = XYZ[2] = 0.;
937 return;
938 }
939 /* decode color */
940 Ce = p & 0x3fff;
941 if (uv_decode(&u, &v, Ce) < 0) {
942 u = U_NEU; v = V_NEU;
943 }
944 s = 1./(6.*u - 16.*v + 12.);
945 x = 9.*u * s;
946 y = 4.*v * s;
947 /* convert to XYZ */
948 XYZ[0] = (float)(x/y * L);
949 XYZ[1] = (float)L;
950 XYZ[2] = (float)((1.-x-y)/y * L);
951 }
952
953 #if !LOGLUV_PUBLIC
954 static
955 #endif
956 uint32
LogLuv24fromXYZ(float XYZ[3],int em)957 LogLuv24fromXYZ(float XYZ[3], int em)
958 {
959 int Le, Ce;
960 double u, v, s;
961 /* encode luminance */
962 Le = LogL10fromY(XYZ[1], em);
963 /* encode color */
964 s = XYZ[0] + 15.*XYZ[1] + 3.*XYZ[2];
965 if (!Le || s <= 0.) {
966 u = U_NEU;
967 v = V_NEU;
968 } else {
969 u = 4.*XYZ[0] / s;
970 v = 9.*XYZ[1] / s;
971 }
972 Ce = uv_encode(u, v, em);
973 if (Ce < 0) /* never happens */
974 Ce = uv_encode(U_NEU, V_NEU, SGILOGENCODE_NODITHER);
975 /* combine encodings */
976 return (Le << 14 | Ce);
977 }
978
979 static void
Luv24toXYZ(LogLuvState * sp,uint8 * op,tmsize_t n)980 Luv24toXYZ(LogLuvState* sp, uint8* op, tmsize_t n)
981 {
982 uint32* luv = (uint32*) sp->tbuf;
983 float* xyz = (float*) op;
984
985 while (n-- > 0) {
986 LogLuv24toXYZ(*luv, xyz);
987 xyz += 3;
988 luv++;
989 }
990 }
991
992 static void
Luv24toLuv48(LogLuvState * sp,uint8 * op,tmsize_t n)993 Luv24toLuv48(LogLuvState* sp, uint8* op, tmsize_t n)
994 {
995 uint32* luv = (uint32*) sp->tbuf;
996 int16* luv3 = (int16*) op;
997
998 while (n-- > 0) {
999 double u, v;
1000
1001 *luv3++ = (int16)((*luv >> 12 & 0xffd) + 13314);
1002 if (uv_decode(&u, &v, *luv&0x3fff) < 0) {
1003 u = U_NEU;
1004 v = V_NEU;
1005 }
1006 *luv3++ = (int16)(u * (1L<<15));
1007 *luv3++ = (int16)(v * (1L<<15));
1008 luv++;
1009 }
1010 }
1011
1012 static void
Luv24toRGB(LogLuvState * sp,uint8 * op,tmsize_t n)1013 Luv24toRGB(LogLuvState* sp, uint8* op, tmsize_t n)
1014 {
1015 uint32* luv = (uint32*) sp->tbuf;
1016 uint8* rgb = (uint8*) op;
1017
1018 while (n-- > 0) {
1019 float xyz[3];
1020
1021 LogLuv24toXYZ(*luv++, xyz);
1022 XYZtoRGB24(xyz, rgb);
1023 rgb += 3;
1024 }
1025 }
1026
1027 static void
Luv24fromXYZ(LogLuvState * sp,uint8 * op,tmsize_t n)1028 Luv24fromXYZ(LogLuvState* sp, uint8* op, tmsize_t n)
1029 {
1030 uint32* luv = (uint32*) sp->tbuf;
1031 float* xyz = (float*) op;
1032
1033 while (n-- > 0) {
1034 *luv++ = LogLuv24fromXYZ(xyz, sp->encode_meth);
1035 xyz += 3;
1036 }
1037 }
1038
1039 static void
Luv24fromLuv48(LogLuvState * sp,uint8 * op,tmsize_t n)1040 Luv24fromLuv48(LogLuvState* sp, uint8* op, tmsize_t n)
1041 {
1042 uint32* luv = (uint32*) sp->tbuf;
1043 int16* luv3 = (int16*) op;
1044
1045 while (n-- > 0) {
1046 int Le, Ce;
1047
1048 if (luv3[0] <= 0)
1049 Le = 0;
1050 else if (luv3[0] >= (1<<12)+3314)
1051 Le = (1<<10) - 1;
1052 else if (sp->encode_meth == SGILOGENCODE_NODITHER)
1053 Le = (luv3[0]-3314) >> 2;
1054 else
1055 Le = itrunc(.25*(luv3[0]-3314.), sp->encode_meth);
1056
1057 Ce = uv_encode((luv3[1]+.5)/(1<<15), (luv3[2]+.5)/(1<<15),
1058 sp->encode_meth);
1059 if (Ce < 0) /* never happens */
1060 Ce = uv_encode(U_NEU, V_NEU, SGILOGENCODE_NODITHER);
1061 *luv++ = (uint32)Le << 14 | Ce;
1062 luv3 += 3;
1063 }
1064 }
1065
1066 #if !LOGLUV_PUBLIC
1067 static
1068 #endif
1069 void
LogLuv32toXYZ(uint32 p,float XYZ[3])1070 LogLuv32toXYZ(uint32 p, float XYZ[3])
1071 {
1072 double L, u, v, s, x, y;
1073 /* decode luminance */
1074 L = LogL16toY((int)p >> 16);
1075 if (L <= 0.) {
1076 XYZ[0] = XYZ[1] = XYZ[2] = 0.;
1077 return;
1078 }
1079 /* decode color */
1080 u = 1./UVSCALE * ((p>>8 & 0xff) + .5);
1081 v = 1./UVSCALE * ((p & 0xff) + .5);
1082 s = 1./(6.*u - 16.*v + 12.);
1083 x = 9.*u * s;
1084 y = 4.*v * s;
1085 /* convert to XYZ */
1086 XYZ[0] = (float)(x/y * L);
1087 XYZ[1] = (float)L;
1088 XYZ[2] = (float)((1.-x-y)/y * L);
1089 }
1090
1091 #if !LOGLUV_PUBLIC
1092 static
1093 #endif
1094 uint32
LogLuv32fromXYZ(float XYZ[3],int em)1095 LogLuv32fromXYZ(float XYZ[3], int em)
1096 {
1097 unsigned int Le, ue, ve;
1098 double u, v, s;
1099 /* encode luminance */
1100 Le = (unsigned int)LogL16fromY(XYZ[1], em);
1101 /* encode color */
1102 s = XYZ[0] + 15.*XYZ[1] + 3.*XYZ[2];
1103 if (!Le || s <= 0.) {
1104 u = U_NEU;
1105 v = V_NEU;
1106 } else {
1107 u = 4.*XYZ[0] / s;
1108 v = 9.*XYZ[1] / s;
1109 }
1110 if (u <= 0.) ue = 0;
1111 else ue = itrunc(UVSCALE*u, em);
1112 if (ue > 255) ue = 255;
1113 if (v <= 0.) ve = 0;
1114 else ve = itrunc(UVSCALE*v, em);
1115 if (ve > 255) ve = 255;
1116 /* combine encodings */
1117 return (Le << 16 | ue << 8 | ve);
1118 }
1119
1120 static void
Luv32toXYZ(LogLuvState * sp,uint8 * op,tmsize_t n)1121 Luv32toXYZ(LogLuvState* sp, uint8* op, tmsize_t n)
1122 {
1123 uint32* luv = (uint32*) sp->tbuf;
1124 float* xyz = (float*) op;
1125
1126 while (n-- > 0) {
1127 LogLuv32toXYZ(*luv++, xyz);
1128 xyz += 3;
1129 }
1130 }
1131
1132 static void
Luv32toLuv48(LogLuvState * sp,uint8 * op,tmsize_t n)1133 Luv32toLuv48(LogLuvState* sp, uint8* op, tmsize_t n)
1134 {
1135 uint32* luv = (uint32*) sp->tbuf;
1136 int16* luv3 = (int16*) op;
1137
1138 while (n-- > 0) {
1139 double u, v;
1140
1141 *luv3++ = (int16)(*luv >> 16);
1142 u = 1./UVSCALE * ((*luv>>8 & 0xff) + .5);
1143 v = 1./UVSCALE * ((*luv & 0xff) + .5);
1144 *luv3++ = (int16)(u * (1L<<15));
1145 *luv3++ = (int16)(v * (1L<<15));
1146 luv++;
1147 }
1148 }
1149
1150 static void
Luv32toRGB(LogLuvState * sp,uint8 * op,tmsize_t n)1151 Luv32toRGB(LogLuvState* sp, uint8* op, tmsize_t n)
1152 {
1153 uint32* luv = (uint32*) sp->tbuf;
1154 uint8* rgb = (uint8*) op;
1155
1156 while (n-- > 0) {
1157 float xyz[3];
1158
1159 LogLuv32toXYZ(*luv++, xyz);
1160 XYZtoRGB24(xyz, rgb);
1161 rgb += 3;
1162 }
1163 }
1164
1165 static void
Luv32fromXYZ(LogLuvState * sp,uint8 * op,tmsize_t n)1166 Luv32fromXYZ(LogLuvState* sp, uint8* op, tmsize_t n)
1167 {
1168 uint32* luv = (uint32*) sp->tbuf;
1169 float* xyz = (float*) op;
1170
1171 while (n-- > 0) {
1172 *luv++ = LogLuv32fromXYZ(xyz, sp->encode_meth);
1173 xyz += 3;
1174 }
1175 }
1176
1177 static void
Luv32fromLuv48(LogLuvState * sp,uint8 * op,tmsize_t n)1178 Luv32fromLuv48(LogLuvState* sp, uint8* op, tmsize_t n)
1179 {
1180 uint32* luv = (uint32*) sp->tbuf;
1181 int16* luv3 = (int16*) op;
1182
1183 if (sp->encode_meth == SGILOGENCODE_NODITHER) {
1184 while (n-- > 0) {
1185 *luv++ = (uint32)luv3[0] << 16 |
1186 (luv3[1]*(uint32)(UVSCALE+.5) >> 7 & 0xff00) |
1187 (luv3[2]*(uint32)(UVSCALE+.5) >> 15 & 0xff);
1188 luv3 += 3;
1189 }
1190 return;
1191 }
1192 while (n-- > 0) {
1193 *luv++ = (uint32)luv3[0] << 16 |
1194 (itrunc(luv3[1]*(UVSCALE/(1<<15)), sp->encode_meth) << 8 & 0xff00) |
1195 (itrunc(luv3[2]*(UVSCALE/(1<<15)), sp->encode_meth) & 0xff);
1196 luv3 += 3;
1197 }
1198 }
1199
1200 static void
_logLuvNop(LogLuvState * sp,uint8 * op,tmsize_t n)1201 _logLuvNop(LogLuvState* sp, uint8* op, tmsize_t n)
1202 {
1203 (void) sp; (void) op; (void) n;
1204 }
1205
1206 static int
LogL16GuessDataFmt(TIFFDirectory * td)1207 LogL16GuessDataFmt(TIFFDirectory *td)
1208 {
1209 #define PACK(s,b,f) (((b)<<6)|((s)<<3)|(f))
1210 switch (PACK(td->td_samplesperpixel, td->td_bitspersample, td->td_sampleformat)) {
1211 case PACK(1, 32, SAMPLEFORMAT_IEEEFP):
1212 return (SGILOGDATAFMT_FLOAT);
1213 case PACK(1, 16, SAMPLEFORMAT_VOID):
1214 case PACK(1, 16, SAMPLEFORMAT_INT):
1215 case PACK(1, 16, SAMPLEFORMAT_UINT):
1216 return (SGILOGDATAFMT_16BIT);
1217 case PACK(1, 8, SAMPLEFORMAT_VOID):
1218 case PACK(1, 8, SAMPLEFORMAT_UINT):
1219 return (SGILOGDATAFMT_8BIT);
1220 }
1221 #undef PACK
1222 return (SGILOGDATAFMT_UNKNOWN);
1223 }
1224
1225 static tmsize_t
multiply_ms(tmsize_t m1,tmsize_t m2)1226 multiply_ms(tmsize_t m1, tmsize_t m2)
1227 {
1228 tmsize_t bytes = m1 * m2;
1229
1230 if (m1 && bytes / m1 != m2)
1231 bytes = 0;
1232
1233 return bytes;
1234 }
1235
1236 static int
LogL16InitState(TIFF * tif)1237 LogL16InitState(TIFF* tif)
1238 {
1239 static const char module[] = "LogL16InitState";
1240 TIFFDirectory *td = &tif->tif_dir;
1241 LogLuvState* sp = DecoderState(tif);
1242
1243 assert(sp != NULL);
1244 assert(td->td_photometric == PHOTOMETRIC_LOGL);
1245
1246 /* for some reason, we can't do this in TIFFInitLogL16 */
1247 if (sp->user_datafmt == SGILOGDATAFMT_UNKNOWN)
1248 sp->user_datafmt = LogL16GuessDataFmt(td);
1249 switch (sp->user_datafmt) {
1250 case SGILOGDATAFMT_FLOAT:
1251 sp->pixel_size = sizeof (float);
1252 break;
1253 case SGILOGDATAFMT_16BIT:
1254 sp->pixel_size = sizeof (int16);
1255 break;
1256 case SGILOGDATAFMT_8BIT:
1257 sp->pixel_size = sizeof (uint8);
1258 break;
1259 default:
1260 TIFFErrorExt(tif->tif_clientdata, module,
1261 "No support for converting user data format to LogL");
1262 return (0);
1263 }
1264 if( isTiled(tif) )
1265 sp->tbuflen = multiply_ms(td->td_tilewidth, td->td_tilelength);
1266 else
1267 sp->tbuflen = multiply_ms(td->td_imagewidth, td->td_rowsperstrip);
1268 if (multiply_ms(sp->tbuflen, sizeof (int16)) == 0 ||
1269 (sp->tbuf = (uint8*) _TIFFmalloc(sp->tbuflen * sizeof (int16))) == NULL) {
1270 TIFFErrorExt(tif->tif_clientdata, module, "No space for SGILog translation buffer");
1271 return (0);
1272 }
1273 return (1);
1274 }
1275
1276 static int
LogLuvGuessDataFmt(TIFFDirectory * td)1277 LogLuvGuessDataFmt(TIFFDirectory *td)
1278 {
1279 int guess;
1280
1281 /*
1282 * If the user didn't tell us their datafmt,
1283 * take our best guess from the bitspersample.
1284 */
1285 #define PACK(a,b) (((a)<<3)|(b))
1286 switch (PACK(td->td_bitspersample, td->td_sampleformat)) {
1287 case PACK(32, SAMPLEFORMAT_IEEEFP):
1288 guess = SGILOGDATAFMT_FLOAT;
1289 break;
1290 case PACK(32, SAMPLEFORMAT_VOID):
1291 case PACK(32, SAMPLEFORMAT_UINT):
1292 case PACK(32, SAMPLEFORMAT_INT):
1293 guess = SGILOGDATAFMT_RAW;
1294 break;
1295 case PACK(16, SAMPLEFORMAT_VOID):
1296 case PACK(16, SAMPLEFORMAT_INT):
1297 case PACK(16, SAMPLEFORMAT_UINT):
1298 guess = SGILOGDATAFMT_16BIT;
1299 break;
1300 case PACK( 8, SAMPLEFORMAT_VOID):
1301 case PACK( 8, SAMPLEFORMAT_UINT):
1302 guess = SGILOGDATAFMT_8BIT;
1303 break;
1304 default:
1305 guess = SGILOGDATAFMT_UNKNOWN;
1306 break;
1307 #undef PACK
1308 }
1309 /*
1310 * Double-check samples per pixel.
1311 */
1312 switch (td->td_samplesperpixel) {
1313 case 1:
1314 if (guess != SGILOGDATAFMT_RAW)
1315 guess = SGILOGDATAFMT_UNKNOWN;
1316 break;
1317 case 3:
1318 if (guess == SGILOGDATAFMT_RAW)
1319 guess = SGILOGDATAFMT_UNKNOWN;
1320 break;
1321 default:
1322 guess = SGILOGDATAFMT_UNKNOWN;
1323 break;
1324 }
1325 return (guess);
1326 }
1327
1328 static int
LogLuvInitState(TIFF * tif)1329 LogLuvInitState(TIFF* tif)
1330 {
1331 static const char module[] = "LogLuvInitState";
1332 TIFFDirectory* td = &tif->tif_dir;
1333 LogLuvState* sp = DecoderState(tif);
1334
1335 assert(sp != NULL);
1336 assert(td->td_photometric == PHOTOMETRIC_LOGLUV);
1337
1338 /* for some reason, we can't do this in TIFFInitLogLuv */
1339 if (td->td_planarconfig != PLANARCONFIG_CONTIG) {
1340 TIFFErrorExt(tif->tif_clientdata, module,
1341 "SGILog compression cannot handle non-contiguous data");
1342 return (0);
1343 }
1344 if (sp->user_datafmt == SGILOGDATAFMT_UNKNOWN)
1345 sp->user_datafmt = LogLuvGuessDataFmt(td);
1346 switch (sp->user_datafmt) {
1347 case SGILOGDATAFMT_FLOAT:
1348 sp->pixel_size = 3*sizeof (float);
1349 break;
1350 case SGILOGDATAFMT_16BIT:
1351 sp->pixel_size = 3*sizeof (int16);
1352 break;
1353 case SGILOGDATAFMT_RAW:
1354 sp->pixel_size = sizeof (uint32);
1355 break;
1356 case SGILOGDATAFMT_8BIT:
1357 sp->pixel_size = 3*sizeof (uint8);
1358 break;
1359 default:
1360 TIFFErrorExt(tif->tif_clientdata, module,
1361 "No support for converting user data format to LogLuv");
1362 return (0);
1363 }
1364 if( isTiled(tif) )
1365 sp->tbuflen = multiply_ms(td->td_tilewidth, td->td_tilelength);
1366 else
1367 sp->tbuflen = multiply_ms(td->td_imagewidth, td->td_rowsperstrip);
1368 if (multiply_ms(sp->tbuflen, sizeof (uint32)) == 0 ||
1369 (sp->tbuf = (uint8*) _TIFFmalloc(sp->tbuflen * sizeof (uint32))) == NULL) {
1370 TIFFErrorExt(tif->tif_clientdata, module, "No space for SGILog translation buffer");
1371 return (0);
1372 }
1373 return (1);
1374 }
1375
1376 static int
LogLuvFixupTags(TIFF * tif)1377 LogLuvFixupTags(TIFF* tif)
1378 {
1379 (void) tif;
1380 return (1);
1381 }
1382
1383 static int
LogLuvSetupDecode(TIFF * tif)1384 LogLuvSetupDecode(TIFF* tif)
1385 {
1386 static const char module[] = "LogLuvSetupDecode";
1387 LogLuvState* sp = DecoderState(tif);
1388 TIFFDirectory* td = &tif->tif_dir;
1389
1390 tif->tif_postdecode = _TIFFNoPostDecode;
1391 switch (td->td_photometric) {
1392 case PHOTOMETRIC_LOGLUV:
1393 if (!LogLuvInitState(tif))
1394 break;
1395 if (td->td_compression == COMPRESSION_SGILOG24) {
1396 tif->tif_decoderow = LogLuvDecode24;
1397 switch (sp->user_datafmt) {
1398 case SGILOGDATAFMT_FLOAT:
1399 sp->tfunc = Luv24toXYZ;
1400 break;
1401 case SGILOGDATAFMT_16BIT:
1402 sp->tfunc = Luv24toLuv48;
1403 break;
1404 case SGILOGDATAFMT_8BIT:
1405 sp->tfunc = Luv24toRGB;
1406 break;
1407 }
1408 } else {
1409 tif->tif_decoderow = LogLuvDecode32;
1410 switch (sp->user_datafmt) {
1411 case SGILOGDATAFMT_FLOAT:
1412 sp->tfunc = Luv32toXYZ;
1413 break;
1414 case SGILOGDATAFMT_16BIT:
1415 sp->tfunc = Luv32toLuv48;
1416 break;
1417 case SGILOGDATAFMT_8BIT:
1418 sp->tfunc = Luv32toRGB;
1419 break;
1420 }
1421 }
1422 return (1);
1423 case PHOTOMETRIC_LOGL:
1424 if (!LogL16InitState(tif))
1425 break;
1426 tif->tif_decoderow = LogL16Decode;
1427 switch (sp->user_datafmt) {
1428 case SGILOGDATAFMT_FLOAT:
1429 sp->tfunc = L16toY;
1430 break;
1431 case SGILOGDATAFMT_8BIT:
1432 sp->tfunc = L16toGry;
1433 break;
1434 }
1435 return (1);
1436 default:
1437 TIFFErrorExt(tif->tif_clientdata, module,
1438 "Inappropriate photometric interpretation %d for SGILog compression; %s",
1439 td->td_photometric, "must be either LogLUV or LogL");
1440 break;
1441 }
1442 return (0);
1443 }
1444
1445 static int
LogLuvSetupEncode(TIFF * tif)1446 LogLuvSetupEncode(TIFF* tif)
1447 {
1448 static const char module[] = "LogLuvSetupEncode";
1449 LogLuvState* sp = EncoderState(tif);
1450 TIFFDirectory* td = &tif->tif_dir;
1451
1452 switch (td->td_photometric) {
1453 case PHOTOMETRIC_LOGLUV:
1454 if (!LogLuvInitState(tif))
1455 break;
1456 if (td->td_compression == COMPRESSION_SGILOG24) {
1457 tif->tif_encoderow = LogLuvEncode24;
1458 switch (sp->user_datafmt) {
1459 case SGILOGDATAFMT_FLOAT:
1460 sp->tfunc = Luv24fromXYZ;
1461 break;
1462 case SGILOGDATAFMT_16BIT:
1463 sp->tfunc = Luv24fromLuv48;
1464 break;
1465 case SGILOGDATAFMT_RAW:
1466 break;
1467 default:
1468 goto notsupported;
1469 }
1470 } else {
1471 tif->tif_encoderow = LogLuvEncode32;
1472 switch (sp->user_datafmt) {
1473 case SGILOGDATAFMT_FLOAT:
1474 sp->tfunc = Luv32fromXYZ;
1475 break;
1476 case SGILOGDATAFMT_16BIT:
1477 sp->tfunc = Luv32fromLuv48;
1478 break;
1479 case SGILOGDATAFMT_RAW:
1480 break;
1481 default:
1482 goto notsupported;
1483 }
1484 }
1485 break;
1486 case PHOTOMETRIC_LOGL:
1487 if (!LogL16InitState(tif))
1488 break;
1489 tif->tif_encoderow = LogL16Encode;
1490 switch (sp->user_datafmt) {
1491 case SGILOGDATAFMT_FLOAT:
1492 sp->tfunc = L16fromY;
1493 break;
1494 case SGILOGDATAFMT_16BIT:
1495 break;
1496 default:
1497 goto notsupported;
1498 }
1499 break;
1500 default:
1501 TIFFErrorExt(tif->tif_clientdata, module,
1502 "Inappropriate photometric interpretation %d for SGILog compression; %s",
1503 td->td_photometric, "must be either LogLUV or LogL");
1504 break;
1505 }
1506 return (1);
1507 notsupported:
1508 TIFFErrorExt(tif->tif_clientdata, module,
1509 "SGILog compression supported only for %s, or raw data",
1510 td->td_photometric == PHOTOMETRIC_LOGL ? "Y, L" : "XYZ, Luv");
1511 return (0);
1512 }
1513
1514 static void
LogLuvClose(TIFF * tif)1515 LogLuvClose(TIFF* tif)
1516 {
1517 TIFFDirectory *td = &tif->tif_dir;
1518
1519 /*
1520 * For consistency, we always want to write out the same
1521 * bitspersample and sampleformat for our TIFF file,
1522 * regardless of the data format being used by the application.
1523 * Since this routine is called after tags have been set but
1524 * before they have been recorded in the file, we reset them here.
1525 */
1526 td->td_samplesperpixel =
1527 (td->td_photometric == PHOTOMETRIC_LOGL) ? 1 : 3;
1528 td->td_bitspersample = 16;
1529 td->td_sampleformat = SAMPLEFORMAT_INT;
1530 }
1531
1532 static void
LogLuvCleanup(TIFF * tif)1533 LogLuvCleanup(TIFF* tif)
1534 {
1535 LogLuvState* sp = (LogLuvState *)tif->tif_data;
1536
1537 assert(sp != 0);
1538
1539 tif->tif_tagmethods.vgetfield = sp->vgetparent;
1540 tif->tif_tagmethods.vsetfield = sp->vsetparent;
1541
1542 if (sp->tbuf)
1543 _TIFFfree(sp->tbuf);
1544 _TIFFfree(sp);
1545 tif->tif_data = NULL;
1546
1547 _TIFFSetDefaultCompressionState(tif);
1548 }
1549
1550 static int
LogLuvVSetField(TIFF * tif,uint32 tag,va_list ap)1551 LogLuvVSetField(TIFF* tif, uint32 tag, va_list ap)
1552 {
1553 static const char module[] = "LogLuvVSetField";
1554 LogLuvState* sp = DecoderState(tif);
1555 int bps, fmt;
1556
1557 switch (tag) {
1558 case TIFFTAG_SGILOGDATAFMT:
1559 sp->user_datafmt = (int) va_arg(ap, int);
1560 /*
1561 * Tweak the TIFF header so that the rest of libtiff knows what
1562 * size of data will be passed between app and library, and
1563 * assume that the app knows what it is doing and is not
1564 * confused by these header manipulations...
1565 */
1566 switch (sp->user_datafmt) {
1567 case SGILOGDATAFMT_FLOAT:
1568 bps = 32, fmt = SAMPLEFORMAT_IEEEFP;
1569 break;
1570 case SGILOGDATAFMT_16BIT:
1571 bps = 16, fmt = SAMPLEFORMAT_INT;
1572 break;
1573 case SGILOGDATAFMT_RAW:
1574 bps = 32, fmt = SAMPLEFORMAT_UINT;
1575 TIFFSetField(tif, TIFFTAG_SAMPLESPERPIXEL, 1);
1576 break;
1577 case SGILOGDATAFMT_8BIT:
1578 bps = 8, fmt = SAMPLEFORMAT_UINT;
1579 break;
1580 default:
1581 TIFFErrorExt(tif->tif_clientdata, tif->tif_name,
1582 "Unknown data format %d for LogLuv compression",
1583 sp->user_datafmt);
1584 return (0);
1585 }
1586 TIFFSetField(tif, TIFFTAG_BITSPERSAMPLE, bps);
1587 TIFFSetField(tif, TIFFTAG_SAMPLEFORMAT, fmt);
1588 /*
1589 * Must recalculate sizes should bits/sample change.
1590 */
1591 tif->tif_tilesize = isTiled(tif) ? TIFFTileSize(tif) : (tmsize_t) -1;
1592 tif->tif_scanlinesize = TIFFScanlineSize(tif);
1593 return (1);
1594 case TIFFTAG_SGILOGENCODE:
1595 sp->encode_meth = (int) va_arg(ap, int);
1596 if (sp->encode_meth != SGILOGENCODE_NODITHER &&
1597 sp->encode_meth != SGILOGENCODE_RANDITHER) {
1598 TIFFErrorExt(tif->tif_clientdata, module,
1599 "Unknown encoding %d for LogLuv compression",
1600 sp->encode_meth);
1601 return (0);
1602 }
1603 return (1);
1604 default:
1605 return (*sp->vsetparent)(tif, tag, ap);
1606 }
1607 }
1608
1609 static int
LogLuvVGetField(TIFF * tif,uint32 tag,va_list ap)1610 LogLuvVGetField(TIFF* tif, uint32 tag, va_list ap)
1611 {
1612 LogLuvState *sp = (LogLuvState *)tif->tif_data;
1613
1614 switch (tag) {
1615 case TIFFTAG_SGILOGDATAFMT:
1616 *va_arg(ap, int*) = sp->user_datafmt;
1617 return (1);
1618 default:
1619 return (*sp->vgetparent)(tif, tag, ap);
1620 }
1621 }
1622
1623 static const TIFFField LogLuvFields[] = {
1624 { TIFFTAG_SGILOGDATAFMT, 0, 0, TIFF_SHORT, 0, TIFF_SETGET_INT, TIFF_SETGET_UNDEFINED, FIELD_PSEUDO, TRUE, FALSE, "SGILogDataFmt", NULL},
1625 { TIFFTAG_SGILOGENCODE, 0, 0, TIFF_SHORT, 0, TIFF_SETGET_INT, TIFF_SETGET_UNDEFINED, FIELD_PSEUDO, TRUE, FALSE, "SGILogEncode", NULL}
1626 };
1627
1628 int
TIFFInitSGILog(TIFF * tif,int scheme)1629 TIFFInitSGILog(TIFF* tif, int scheme)
1630 {
1631 static const char module[] = "TIFFInitSGILog";
1632 LogLuvState* sp;
1633
1634 assert(scheme == COMPRESSION_SGILOG24 || scheme == COMPRESSION_SGILOG);
1635
1636 /*
1637 * Merge codec-specific tag information.
1638 */
1639 if (!_TIFFMergeFields(tif, LogLuvFields,
1640 TIFFArrayCount(LogLuvFields))) {
1641 TIFFErrorExt(tif->tif_clientdata, module,
1642 "Merging SGILog codec-specific tags failed");
1643 return 0;
1644 }
1645
1646 /*
1647 * Allocate state block so tag methods have storage to record values.
1648 */
1649 tif->tif_data = (uint8*) _TIFFmalloc(sizeof (LogLuvState));
1650 if (tif->tif_data == NULL)
1651 goto bad;
1652 sp = (LogLuvState*) tif->tif_data;
1653 _TIFFmemset((void*)sp, 0, sizeof (*sp));
1654 sp->user_datafmt = SGILOGDATAFMT_UNKNOWN;
1655 sp->encode_meth = (scheme == COMPRESSION_SGILOG24) ?
1656 SGILOGENCODE_RANDITHER : SGILOGENCODE_NODITHER;
1657 sp->tfunc = _logLuvNop;
1658
1659 /*
1660 * Install codec methods.
1661 * NB: tif_decoderow & tif_encoderow are filled
1662 * in at setup time.
1663 */
1664 tif->tif_fixuptags = LogLuvFixupTags;
1665 tif->tif_setupdecode = LogLuvSetupDecode;
1666 tif->tif_decodestrip = LogLuvDecodeStrip;
1667 tif->tif_decodetile = LogLuvDecodeTile;
1668 tif->tif_setupencode = LogLuvSetupEncode;
1669 tif->tif_encodestrip = LogLuvEncodeStrip;
1670 tif->tif_encodetile = LogLuvEncodeTile;
1671 tif->tif_close = LogLuvClose;
1672 tif->tif_cleanup = LogLuvCleanup;
1673
1674 /*
1675 * Override parent get/set field methods.
1676 */
1677 sp->vgetparent = tif->tif_tagmethods.vgetfield;
1678 tif->tif_tagmethods.vgetfield = LogLuvVGetField; /* hook for codec tags */
1679 sp->vsetparent = tif->tif_tagmethods.vsetfield;
1680 tif->tif_tagmethods.vsetfield = LogLuvVSetField; /* hook for codec tags */
1681
1682 return (1);
1683 bad:
1684 TIFFErrorExt(tif->tif_clientdata, module,
1685 "%s: No space for LogLuv state block", tif->tif_name);
1686 return (0);
1687 }
1688 #endif /* LOGLUV_SUPPORT */
1689
1690 /* vim: set ts=8 sts=8 sw=8 noet: */
1691 /*
1692 * Local Variables:
1693 * mode: c
1694 * c-basic-offset: 8
1695 * fill-column: 78
1696 * End:
1697 */
1698