1 /* PDFlib GmbH cvsid:
2 * $Id: tif_luv.c,v 1.10 2005/12/21 14:12:52 rjs Exp $ */
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 tidata_t* tbuf; /* translation buffer */
166 int tbuflen; /* buffer length */
167 void (*tfunc)(LogLuvState*, tidata_t, int);
168
169 TIFFVSetMethod vgetparent; /* super-class method */
170 TIFFVSetMethod vsetparent; /* super-class method */
171 };
172
173 #define DecoderState(tif) ((LogLuvState*) (tif)->tif_data)
174 #ifdef PDFLIB_TIFFWRITE_SUPPORT
175 #define EncoderState(tif) ((LogLuvState*) (tif)->tif_data)
176 #endif /* PDFLIB_TIFFWRITE_SUPPORT */
177
178 #define N(a) (sizeof(a)/sizeof(a[0]))
179 #define SGILOGDATAFMT_UNKNOWN -1
180
181 #define MINRUN 4 /* minimum run length */
182
183 /*
184 * Decode a string of 16-bit gray pixels.
185 */
186 static int
LogL16Decode(TIFF * tif,tidata_t op,tsize_t occ,tsample_t s)187 LogL16Decode(TIFF* tif, tidata_t op, tsize_t occ, tsample_t s)
188 {
189 LogLuvState* sp = DecoderState(tif);
190 int shft, i, npixels;
191 unsigned char* bp;
192 int16* tp;
193 int16 b;
194 int cc, rc;
195
196 assert(s == 0);
197 assert(sp != NULL);
198
199 npixels = occ / sp->pixel_size;
200
201 if (sp->user_datafmt == SGILOGDATAFMT_16BIT)
202 tp = (int16*) op;
203 else {
204 assert(sp->tbuflen >= npixels);
205 tp = (int16*) sp->tbuf;
206 }
207 _TIFFmemset((tdata_t) tp, 0, npixels*sizeof (tp[0]));
208
209 bp = (unsigned char*) tif->tif_rawcp;
210 cc = tif->tif_rawcc;
211 /* get each byte string */
212 for (shft = 2*8; (shft -= 8) >= 0; ) {
213 for (i = 0; i < npixels && cc > 0; )
214 if (*bp >= 128) { /* run */
215 rc = *bp++ + (2-128);
216 b = (int16)(*bp++ << shft);
217 cc -= 2;
218 while (rc-- && i < npixels)
219 tp[i++] |= b;
220 } else { /* non-run */
221 rc = *bp++; /* nul is noop */
222 while (--cc && rc-- && i < npixels)
223 tp[i++] |= (int16)*bp++ << shft;
224 }
225 if (i != npixels) {
226 _TIFFError(tif, tif->tif_name,
227 "LogL16Decode: Not enough data at row %d (short %d pixels)",
228 tif->tif_row, npixels - i);
229 tif->tif_rawcp = (tidata_t) bp;
230 tif->tif_rawcc = cc;
231 return (0);
232 }
233 }
234 (*sp->tfunc)(sp, op, npixels);
235 tif->tif_rawcp = (tidata_t) bp;
236 tif->tif_rawcc = cc;
237 return (1);
238 }
239
240 /*
241 * Decode a string of 24-bit pixels.
242 */
243 static int
LogLuvDecode24(TIFF * tif,tidata_t op,tsize_t occ,tsample_t s)244 LogLuvDecode24(TIFF* tif, tidata_t op, tsize_t occ, tsample_t s)
245 {
246 LogLuvState* sp = DecoderState(tif);
247 int cc, i, npixels;
248 unsigned char * bp;
249 uint32* tp;
250
251 assert(s == 0);
252 assert(sp != NULL);
253
254 npixels = occ / sp->pixel_size;
255
256 if (sp->user_datafmt == SGILOGDATAFMT_RAW)
257 tp = (uint32 *)op;
258 else {
259 assert(sp->tbuflen >= npixels);
260 tp = (uint32 *) sp->tbuf;
261 }
262 /* copy to array of uint32 */
263 bp = (unsigned char*) tif->tif_rawcp;
264 cc = tif->tif_rawcc;
265 for (i = 0; i < npixels && cc > 0; i++) {
266 tp[i] = bp[0] << 16 | bp[1] << 8 | bp[2];
267 bp += 3;
268 cc -= 3;
269 }
270 tif->tif_rawcp = (tidata_t) bp;
271 tif->tif_rawcc = cc;
272 if (i != npixels) {
273 _TIFFError(tif, tif->tif_name,
274 "LogLuvDecode24: Not enough data at row %d (short %d pixels)",
275 tif->tif_row, npixels - i);
276 return (0);
277 }
278 (*sp->tfunc)(sp, op, npixels);
279 return (1);
280 }
281
282 /*
283 * Decode a string of 32-bit pixels.
284 */
285 static int
LogLuvDecode32(TIFF * tif,tidata_t op,tsize_t occ,tsample_t s)286 LogLuvDecode32(TIFF* tif, tidata_t op, tsize_t occ, tsample_t s)
287 {
288 LogLuvState* sp;
289 int shft, i, npixels;
290 unsigned char* bp;
291 uint32* tp;
292 uint32 b;
293 int cc, rc;
294
295 assert(s == 0);
296 sp = DecoderState(tif);
297 assert(sp != NULL);
298
299 npixels = occ / sp->pixel_size;
300
301 if (sp->user_datafmt == SGILOGDATAFMT_RAW)
302 tp = (uint32*) op;
303 else {
304 assert(sp->tbuflen >= npixels);
305 tp = (uint32*) sp->tbuf;
306 }
307 _TIFFmemset((tdata_t) tp, 0, npixels*sizeof (tp[0]));
308
309 bp = (unsigned char*) tif->tif_rawcp;
310 cc = tif->tif_rawcc;
311 /* get each byte string */
312 for (shft = 4*8; (shft -= 8) >= 0; ) {
313 for (i = 0; i < npixels && cc > 0; )
314 if (*bp >= 128) { /* run */
315 rc = *bp++ + (2-128);
316 b = (uint32)*bp++ << shft;
317 cc -= 2;
318 while (rc-- && i < npixels)
319 tp[i++] |= b;
320 } else { /* non-run */
321 rc = *bp++; /* nul is noop */
322 while (--cc && rc-- && i < npixels)
323 tp[i++] |= (uint32)*bp++ << shft;
324 }
325 if (i != npixels) {
326 _TIFFError(tif, tif->tif_name,
327 "LogLuvDecode32: Not enough data at row %d (short %d pixels)",
328 tif->tif_row, npixels - i);
329 tif->tif_rawcp = (tidata_t) bp;
330 tif->tif_rawcc = cc;
331 return (0);
332 }
333 }
334 (*sp->tfunc)(sp, op, npixels);
335 tif->tif_rawcp = (tidata_t) bp;
336 tif->tif_rawcc = cc;
337 return (1);
338 }
339
340 /*
341 * Decode a strip of pixels. We break it into rows to
342 * maintain synchrony with the encode algorithm, which
343 * is row by row.
344 */
345 static int
LogLuvDecodeStrip(TIFF * tif,tidata_t bp,tsize_t cc,tsample_t s)346 LogLuvDecodeStrip(TIFF* tif, tidata_t bp, tsize_t cc, tsample_t s)
347 {
348 tsize_t rowlen = TIFFScanlineSize(tif);
349
350 assert(cc%rowlen == 0);
351 while (cc && (*tif->tif_decoderow)(tif, bp, rowlen, s))
352 bp += rowlen, cc -= rowlen;
353 return (cc == 0);
354 }
355
356 /*
357 * Decode a tile of pixels. We break it into rows to
358 * maintain synchrony with the encode algorithm, which
359 * is row by row.
360 */
361 static int
LogLuvDecodeTile(TIFF * tif,tidata_t bp,tsize_t cc,tsample_t s)362 LogLuvDecodeTile(TIFF* tif, tidata_t bp, tsize_t cc, tsample_t s)
363 {
364 tsize_t rowlen = TIFFTileRowSize(tif);
365
366 assert(cc%rowlen == 0);
367 while (cc && (*tif->tif_decoderow)(tif, bp, rowlen, s))
368 bp += rowlen, cc -= rowlen;
369 return (cc == 0);
370 }
371
372 /*
373 * Encode a row of 16-bit pixels.
374 */
375 #ifdef PDFLIB_TIFFWRITE_SUPPORT
376 static int
LogL16Encode(TIFF * tif,tidata_t bp,tsize_t cc,tsample_t s)377 LogL16Encode(TIFF* tif, tidata_t bp, tsize_t cc, tsample_t s)
378 {
379 LogLuvState* sp = EncoderState(tif);
380 int shft, i, j, npixels;
381 tidata_t op;
382 int16* tp;
383 int16 b;
384 int occ, rc=0, mask, beg;
385
386 assert(s == 0);
387 assert(sp != NULL);
388 npixels = cc / sp->pixel_size;
389
390 if (sp->user_datafmt == SGILOGDATAFMT_16BIT)
391 tp = (int16*) bp;
392 else {
393 tp = (int16*) sp->tbuf;
394 assert(sp->tbuflen >= npixels);
395 (*sp->tfunc)(sp, bp, npixels);
396 }
397 /* compress each byte string */
398 op = tif->tif_rawcp;
399 occ = tif->tif_rawdatasize - tif->tif_rawcc;
400 for (shft = 2*8; (shft -= 8) >= 0; )
401 for (i = 0; i < npixels; i += rc) {
402 if (occ < 4) {
403 tif->tif_rawcp = op;
404 tif->tif_rawcc = tif->tif_rawdatasize - occ;
405 if (!TIFFFlushData1(tif))
406 return (-1);
407 op = tif->tif_rawcp;
408 occ = tif->tif_rawdatasize - tif->tif_rawcc;
409 }
410 mask = 0xff << shft; /* find next run */
411 for (beg = i; beg < npixels; beg += rc) {
412 b = (int16) (tp[beg] & mask);
413 rc = 1;
414 while (rc < 127+2 && beg+rc < npixels &&
415 (tp[beg+rc] & mask) == b)
416 rc++;
417 if (rc >= MINRUN)
418 break; /* long enough */
419 }
420 if (beg-i > 1 && beg-i < MINRUN) {
421 b = (int16) (tp[i] & mask);/*check short run */
422 j = i+1;
423 while ((tp[j++] & mask) == b)
424 if (j == beg) {
425 *op++ = (tidataval_t)(128-2+j-i);
426 *op++ = (tidataval_t) (b >> shft);
427 occ -= 2;
428 i = beg;
429 break;
430 }
431 }
432 while (i < beg) { /* write out non-run */
433 if ((j = beg-i) > 127) j = 127;
434 if (occ < j+3) {
435 tif->tif_rawcp = op;
436 tif->tif_rawcc = tif->tif_rawdatasize - occ;
437 if (!TIFFFlushData1(tif))
438 return (-1);
439 op = tif->tif_rawcp;
440 occ = tif->tif_rawdatasize - tif->tif_rawcc;
441 }
442 *op++ = (tidataval_t) j; occ--;
443 while (j--) {
444 *op++ = (tidataval_t) (tp[i++]>>shft&0xff);
445 occ--;
446 }
447 }
448 if (rc >= MINRUN) { /* write out run */
449 *op++ = (tidataval_t) (128-2+rc);
450 *op++ = (tidataval_t) (tp[beg] >> shft & 0xff);
451 occ -= 2;
452 } else
453 rc = 0;
454 }
455 tif->tif_rawcp = op;
456 tif->tif_rawcc = tif->tif_rawdatasize - occ;
457
458 return (0);
459 }
460 #endif /* PDFLIB_TIFFWRITE_SUPPORT */
461
462 /*
463 * Encode a row of 24-bit pixels.
464 */
465 #ifdef PDFLIB_TIFFWRITE_SUPPORT
466 static int
LogLuvEncode24(TIFF * tif,tidata_t bp,tsize_t cc,tsample_t s)467 LogLuvEncode24(TIFF* tif, tidata_t bp, tsize_t cc, tsample_t s)
468 {
469 LogLuvState* sp = EncoderState(tif);
470 int i, npixels, occ;
471 tidata_t op;
472 uint32* tp;
473
474 assert(s == 0);
475 assert(sp != NULL);
476 npixels = cc / sp->pixel_size;
477
478 if (sp->user_datafmt == SGILOGDATAFMT_RAW)
479 tp = (uint32*) bp;
480 else {
481 tp = (uint32*) sp->tbuf;
482 assert(sp->tbuflen >= npixels);
483 (*sp->tfunc)(sp, bp, npixels);
484 }
485 /* write out encoded pixels */
486 op = tif->tif_rawcp;
487 occ = tif->tif_rawdatasize - tif->tif_rawcc;
488 for (i = npixels; i--; ) {
489 if (occ < 3) {
490 tif->tif_rawcp = op;
491 tif->tif_rawcc = tif->tif_rawdatasize - occ;
492 if (!TIFFFlushData1(tif))
493 return (-1);
494 op = tif->tif_rawcp;
495 occ = tif->tif_rawdatasize - tif->tif_rawcc;
496 }
497 *op++ = (tidataval_t)(*tp >> 16);
498 *op++ = (tidataval_t)(*tp >> 8 & 0xff);
499 *op++ = (tidataval_t)(*tp++ & 0xff);
500 occ -= 3;
501 }
502 tif->tif_rawcp = op;
503 tif->tif_rawcc = tif->tif_rawdatasize - occ;
504
505 return (0);
506 }
507 #endif /* PDFLIB_TIFFWRITE_SUPPORT */
508
509 /*
510 * Encode a row of 32-bit pixels.
511 */
512 #ifdef PDFLIB_TIFFWRITE_SUPPORT
513 static int
LogLuvEncode32(TIFF * tif,tidata_t bp,tsize_t cc,tsample_t s)514 LogLuvEncode32(TIFF* tif, tidata_t bp, tsize_t cc, tsample_t s)
515 {
516 LogLuvState* sp = EncoderState(tif);
517 int shft, i, j, npixels;
518 tidata_t op;
519 uint32* tp;
520 uint32 b;
521 int occ, rc=0, mask, beg;
522
523 assert(s == 0);
524 assert(sp != NULL);
525
526 npixels = cc / sp->pixel_size;
527
528 if (sp->user_datafmt == SGILOGDATAFMT_RAW)
529 tp = (uint32*) bp;
530 else {
531 tp = (uint32*) sp->tbuf;
532 assert(sp->tbuflen >= npixels);
533 (*sp->tfunc)(sp, bp, npixels);
534 }
535 /* compress each byte string */
536 op = tif->tif_rawcp;
537 occ = tif->tif_rawdatasize - tif->tif_rawcc;
538 for (shft = 4*8; (shft -= 8) >= 0; )
539 for (i = 0; i < npixels; i += rc) {
540 if (occ < 4) {
541 tif->tif_rawcp = op;
542 tif->tif_rawcc = tif->tif_rawdatasize - occ;
543 if (!TIFFFlushData1(tif))
544 return (-1);
545 op = tif->tif_rawcp;
546 occ = tif->tif_rawdatasize - tif->tif_rawcc;
547 }
548 mask = 0xff << shft; /* find next run */
549 for (beg = i; beg < npixels; beg += rc) {
550 b = tp[beg] & mask;
551 rc = 1;
552 while (rc < 127+2 && beg+rc < npixels &&
553 (tp[beg+rc] & mask) == b)
554 rc++;
555 if (rc >= MINRUN)
556 break; /* long enough */
557 }
558 if (beg-i > 1 && beg-i < MINRUN) {
559 b = tp[i] & mask; /* check short run */
560 j = i+1;
561 while ((tp[j++] & mask) == b)
562 if (j == beg) {
563 *op++ =(tidataval_t)(128-2+j-i);
564 *op++ =(tidataval_t)(b >> shft);
565 occ -= 2;
566 i = beg;
567 break;
568 }
569 }
570 while (i < beg) { /* write out non-run */
571 if ((j = beg-i) > 127) j = 127;
572 if (occ < j+3) {
573 tif->tif_rawcp = op;
574 tif->tif_rawcc = tif->tif_rawdatasize
575 - occ;
576 if (!TIFFFlushData1(tif))
577 return (-1);
578 op = tif->tif_rawcp;
579 occ = tif->tif_rawdatasize
580 - tif->tif_rawcc;
581 }
582 *op++ = (tidataval_t) j; occ--;
583 while (j--) {
584 *op++ = (tidataval_t)(tp[i++] >> shft
585 & 0xff);
586 occ--;
587 }
588 }
589 if (rc >= MINRUN) { /* write out run */
590 *op++ = (tidataval_t) (128-2+rc);
591 *op++ = (tidataval_t)(tp[beg] >> shft & 0xff);
592 occ -= 2;
593 } else
594 rc = 0;
595 }
596 tif->tif_rawcp = op;
597 tif->tif_rawcc = tif->tif_rawdatasize - occ;
598
599 return (0);
600 }
601 #endif /* PDFLIB_TIFFWRITE_SUPPORT */
602
603 /*
604 * Encode a strip of pixels. We break it into rows to
605 * avoid encoding runs across row boundaries.
606 */
607 #ifdef PDFLIB_TIFFWRITE_SUPPORT
608 static int
LogLuvEncodeStrip(TIFF * tif,tidata_t bp,tsize_t cc,tsample_t s)609 LogLuvEncodeStrip(TIFF* tif, tidata_t bp, tsize_t cc, tsample_t s)
610 {
611 tsize_t rowlen = TIFFScanlineSize(tif);
612
613 assert(cc%rowlen == 0);
614 while (cc && (*tif->tif_encoderow)(tif, bp, rowlen, s) == 0)
615 bp += rowlen, cc -= rowlen;
616 return (cc == 0);
617 }
618 #endif /* PDFLIB_TIFFWRITE_SUPPORT */
619
620 /*
621 * Encode a tile of pixels. We break it into rows to
622 * avoid encoding runs across row boundaries.
623 */
624 #ifdef PDFLIB_TIFFWRITE_SUPPORT
625 static int
LogLuvEncodeTile(TIFF * tif,tidata_t bp,tsize_t cc,tsample_t s)626 LogLuvEncodeTile(TIFF* tif, tidata_t bp, tsize_t cc, tsample_t s)
627 {
628 tsize_t rowlen = TIFFTileRowSize(tif);
629
630 assert(cc%rowlen == 0);
631 while (cc && (*tif->tif_encoderow)(tif, bp, rowlen, s) == 0)
632 bp += rowlen, cc -= rowlen;
633 return (cc == 0);
634 }
635 #endif /* PDFLIB_TIFFWRITE_SUPPORT */
636
637 /*
638 * Encode/Decode functions for converting to and from user formats.
639 */
640
641 #include "uvcode.h"
642
643 #ifndef UVSCALE
644 #define U_NEU 0.210526316
645 #define V_NEU 0.473684211
646 #define UVSCALE 410.
647 #endif
648
649 #ifndef M_LN2
650 #define M_LN2 0.69314718055994530942
651 #endif
652 #ifndef M_PI
653 #define M_PI 3.14159265358979323846
654 #endif
655 #define log2(x) ((1./M_LN2)*log(x))
656 #define exp2(x) exp(M_LN2*(x))
657
658 #define itrunc(x,m) ((m)==SGILOGENCODE_NODITHER ? \
659 (int)(x) : \
660 (int)((x) + rand()*(1./RAND_MAX) - .5))
661
662 #if !LOGLUV_PUBLIC
663 static
664 #endif
665 double
LogL16toY(int p16)666 LogL16toY(int p16) /* compute luminance from 16-bit LogL */
667 {
668 int Le = p16 & 0x7fff;
669 double Y;
670
671 if (!Le)
672 return (0.);
673 Y = exp(M_LN2/256.*(Le+.5) - M_LN2*64.);
674 return (!(p16 & 0x8000) ? Y : -Y);
675 }
676
677 #ifdef PDFLIB_TIFFWRITE_SUPPORT
678 #if !LOGLUV_PUBLIC
679 static
680 #endif
681 int
LogL16fromY(double Y,int em)682 LogL16fromY(double Y, int em) /* get 16-bit LogL from Y */
683 {
684 if (Y >= 1.8371976e19)
685 return (0x7fff);
686 if (Y <= -1.8371976e19)
687 return (0xffff);
688 if (Y > 5.4136769e-20)
689 return itrunc(256.*(log2(Y) + 64.), em);
690 if (Y < -5.4136769e-20)
691 return (~0x7fff | itrunc(256.*(log2(-Y) + 64.), em));
692 return (0);
693 }
694 #endif /* PDFLIB_TIFFWRITE_SUPPORT */
695
696 static void
L16toY(LogLuvState * sp,tidata_t op,int n)697 L16toY(LogLuvState* sp, tidata_t op, int n)
698 {
699 int16* l16 = (int16*) sp->tbuf;
700 float* yp = (float*) op;
701
702 while (n-- > 0)
703 *yp++ = (float)LogL16toY(*l16++);
704 }
705
706 static void
L16toGry(LogLuvState * sp,tidata_t op,int n)707 L16toGry(LogLuvState* sp, tidata_t op, int n)
708 {
709 int16* l16 = (int16*) sp->tbuf;
710 uint8* gp = (uint8*) op;
711
712 while (n-- > 0) {
713 double Y = LogL16toY(*l16++);
714 *gp++ = (uint8) ((Y <= 0.) ? 0 : (Y>=1.) ? 255:(int)(256.*sqrt(Y)));
715 }
716 }
717
718 #ifdef PDFLIB_TIFFWRITE_SUPPORT
719 static void
L16fromY(LogLuvState * sp,tidata_t op,int n)720 L16fromY(LogLuvState* sp, tidata_t op, int n)
721 {
722 int16* l16 = (int16*) sp->tbuf;
723 float* yp = (float*) op;
724
725 while (n-- > 0)
726 *l16++ = (int16) (LogL16fromY(*yp++, sp->encode_meth));
727 }
728 #endif /* PDFLIB_TIFFWRITE_SUPPORT */
729
730 #if !LOGLUV_PUBLIC
731 static
732 #endif
733 void
XYZtoRGB24(float xyz[3],uint8 rgb[3])734 XYZtoRGB24(float xyz[3], uint8 rgb[3])
735 {
736 double r, g, b;
737 /* assume CCIR-709 primaries */
738 r = 2.690*xyz[0] + -1.276*xyz[1] + -0.414*xyz[2];
739 g = -1.022*xyz[0] + 1.978*xyz[1] + 0.044*xyz[2];
740 b = 0.061*xyz[0] + -0.224*xyz[1] + 1.163*xyz[2];
741 /* assume 2.0 gamma for speed */
742 /* could use integer sqrt approx., but this is probably faster */
743 rgb[0] = (uint8)((r<=0.) ? 0 : (r >= 1.) ? 255 : (int)(256.*sqrt(r)));
744 rgb[1] = (uint8)((g<=0.) ? 0 : (g >= 1.) ? 255 : (int)(256.*sqrt(g)));
745 rgb[2] = (uint8)((b<=0.) ? 0 : (b >= 1.) ? 255 : (int)(256.*sqrt(b)));
746 }
747
748 #if !LOGLUV_PUBLIC
749 static
750 #endif
751 double
LogL10toY(int p10)752 LogL10toY(int p10) /* compute luminance from 10-bit LogL */
753 {
754 if (p10 == 0)
755 return (0.);
756 return (exp(M_LN2/64.*(p10+.5) - M_LN2*12.));
757 }
758
759 #if !LOGLUV_PUBLIC
760 static
761 #endif
762 int
LogL10fromY(double Y,int em)763 LogL10fromY(double Y, int em) /* get 10-bit LogL from Y */
764 {
765 if (Y >= 15.742)
766 return (0x3ff);
767 else if (Y <= .00024283)
768 return (0);
769 else
770 return itrunc(64.*(log2(Y) + 12.), em);
771 }
772
773 #define NANGLES 100
774 #define uv2ang(u, v) ( (NANGLES*.499999999/M_PI) \
775 * atan2((v)-V_NEU,(u)-U_NEU) + .5*NANGLES )
776
777 static int
oog_encode(double u,double v)778 oog_encode(double u, double v) /* encode out-of-gamut chroma */
779 {
780 static int oog_table[NANGLES];
781 static int initialized = 0;
782 register int i;
783
784 if (!initialized) { /* set up perimeter table */
785 double eps[NANGLES], ua, va, ang, epsa;
786 int ui, vi, ustep;
787 for (i = NANGLES; i--; )
788 eps[i] = 2.;
789 for (vi = UV_NVS; vi--; ) {
790 va = UV_VSTART + (vi+.5)*UV_SQSIZ;
791 ustep = uv_row[vi].nus-1;
792 if (vi == UV_NVS-1 || vi == 0 || ustep <= 0)
793 ustep = 1;
794 for (ui = uv_row[vi].nus-1; ui >= 0; ui -= ustep) {
795 ua = uv_row[vi].ustart + (ui+.5)*UV_SQSIZ;
796 ang = uv2ang(ua, va);
797 i = (int) ang;
798 epsa = fabs(ang - (i+.5));
799 if (epsa < eps[i]) {
800 oog_table[i] = uv_row[vi].ncum + ui;
801 eps[i] = epsa;
802 }
803 }
804 }
805 for (i = NANGLES; i--; ) /* fill any holes */
806 if (eps[i] > 1.5) {
807 int i1, i2;
808 for (i1 = 1; i1 < NANGLES/2; i1++)
809 if (eps[(i+i1)%NANGLES] < 1.5)
810 break;
811 for (i2 = 1; i2 < NANGLES/2; i2++)
812 if (eps[(i+NANGLES-i2)%NANGLES] < 1.5)
813 break;
814 if (i1 < i2)
815 oog_table[i] =
816 oog_table[(i+i1)%NANGLES];
817 else
818 oog_table[i] =
819 oog_table[(i+NANGLES-i2)%NANGLES];
820 }
821 initialized = 1;
822 }
823 i = (int) uv2ang(u, v); /* look up hue angle */
824 return (oog_table[i]);
825 }
826
827 #undef uv2ang
828 #undef NANGLES
829
830 #if !LOGLUV_PUBLIC
831 static
832 #endif
833 int
uv_encode(double u,double v,int em)834 uv_encode(double u, double v, int em) /* encode (u',v') coordinates */
835 {
836 register int vi, ui;
837
838 if (v < UV_VSTART)
839 return oog_encode(u, v);
840 vi = itrunc((v - UV_VSTART)*(1./UV_SQSIZ), em);
841 if (vi >= UV_NVS)
842 return oog_encode(u, v);
843 if (u < uv_row[vi].ustart)
844 return oog_encode(u, v);
845 ui = itrunc((u - uv_row[vi].ustart)*(1./UV_SQSIZ), em);
846 if (ui >= uv_row[vi].nus)
847 return oog_encode(u, v);
848
849 return (uv_row[vi].ncum + ui);
850 }
851
852 #if !LOGLUV_PUBLIC
853 static
854 #endif
855 int
uv_decode(double * up,double * vp,int c)856 uv_decode(double *up, double *vp, int c) /* decode (u',v') index */
857 {
858 int upper, lower;
859 register int ui, vi;
860
861 if (c < 0 || c >= UV_NDIVS)
862 return (-1);
863 lower = 0; /* binary search */
864 upper = UV_NVS;
865 while (upper - lower > 1) {
866 vi = (lower + upper) >> 1;
867 ui = c - uv_row[vi].ncum;
868 if (ui > 0)
869 lower = vi;
870 else if (ui < 0)
871 upper = vi;
872 else {
873 lower = vi;
874 break;
875 }
876 }
877 vi = lower;
878 ui = c - uv_row[vi].ncum;
879 *up = uv_row[vi].ustart + (ui+.5)*UV_SQSIZ;
880 *vp = UV_VSTART + (vi+.5)*UV_SQSIZ;
881 return (0);
882 }
883
884 #if !LOGLUV_PUBLIC
885 static
886 #endif
887 void
LogLuv24toXYZ(uint32 p,float XYZ[3])888 LogLuv24toXYZ(uint32 p, float XYZ[3])
889 {
890 int Ce;
891 double L, u, v, s, x, y;
892 /* decode luminance */
893 L = LogL10toY(p>>14 & 0x3ff);
894 if (L <= 0.) {
895 XYZ[0] = XYZ[1] = XYZ[2] = 0.;
896 return;
897 }
898 /* decode color */
899 Ce = p & 0x3fff;
900 if (uv_decode(&u, &v, Ce) < 0) {
901 u = U_NEU; v = V_NEU;
902 }
903 s = 1./(6.*u - 16.*v + 12.);
904 x = 9.*u * s;
905 y = 4.*v * s;
906 /* convert to XYZ */
907 XYZ[0] = (float)(x/y * L);
908 XYZ[1] = (float)L;
909 XYZ[2] = (float)((1.-x-y)/y * L);
910 }
911
912 #ifdef PDFLIB_TIFFWRITE_SUPPORT
913 #if !LOGLUV_PUBLIC
914 static
915 #endif
916 uint32
LogLuv24fromXYZ(float XYZ[3],int em)917 LogLuv24fromXYZ(float XYZ[3], int em)
918 {
919 int Le, Ce;
920 double u, v, s;
921 /* encode luminance */
922 Le = LogL10fromY(XYZ[1], em);
923 /* encode color */
924 s = XYZ[0] + 15.*XYZ[1] + 3.*XYZ[2];
925 if (!Le || s <= 0.) {
926 u = U_NEU;
927 v = V_NEU;
928 } else {
929 u = 4.*XYZ[0] / s;
930 v = 9.*XYZ[1] / s;
931 }
932 Ce = uv_encode(u, v, em);
933 if (Ce < 0) /* never happens */
934 Ce = uv_encode(U_NEU, V_NEU, SGILOGENCODE_NODITHER);
935 /* combine encodings */
936 return (Le << 14 | Ce);
937 }
938 #endif /* PDFLIB_TIFFWRITE_SUPPORT */
939
940 static void
Luv24toXYZ(LogLuvState * sp,tidata_t op,int n)941 Luv24toXYZ(LogLuvState* sp, tidata_t op, int n)
942 {
943 uint32* luv = (uint32*) sp->tbuf;
944 float* xyz = (float*) op;
945
946 while (n-- > 0) {
947 LogLuv24toXYZ(*luv, xyz);
948 xyz += 3;
949 luv++;
950 }
951 }
952
953 static void
Luv24toLuv48(LogLuvState * sp,tidata_t op,int n)954 Luv24toLuv48(LogLuvState* sp, tidata_t op, int n)
955 {
956 uint32* luv = (uint32*) sp->tbuf;
957 int16* luv3 = (int16*) op;
958
959 while (n-- > 0) {
960 double u, v;
961
962 *luv3++ = (int16)((*luv >> 12 & 0xffd) + 13314);
963 if (uv_decode(&u, &v, *luv&0x3fff) < 0) {
964 u = U_NEU;
965 v = V_NEU;
966 }
967 *luv3++ = (int16)(u * (1L<<15));
968 *luv3++ = (int16)(v * (1L<<15));
969 luv++;
970 }
971 }
972
973 static void
Luv24toRGB(LogLuvState * sp,tidata_t op,int n)974 Luv24toRGB(LogLuvState* sp, tidata_t op, int n)
975 {
976 uint32* luv = (uint32*) sp->tbuf;
977 uint8* rgb = (uint8*) op;
978
979 while (n-- > 0) {
980 float xyz[3];
981
982 LogLuv24toXYZ(*luv++, xyz);
983 XYZtoRGB24(xyz, rgb);
984 rgb += 3;
985 }
986 }
987
988 #ifdef PDFLIB_TIFFWRITE_SUPPORT
989 static void
Luv24fromXYZ(LogLuvState * sp,tidata_t op,int n)990 Luv24fromXYZ(LogLuvState* sp, tidata_t op, int n)
991 {
992 uint32* luv = (uint32*) sp->tbuf;
993 float* xyz = (float*) op;
994
995 while (n-- > 0) {
996 *luv++ = LogLuv24fromXYZ(xyz, sp->encode_meth);
997 xyz += 3;
998 }
999 }
1000 #endif /* PDFLIB_TIFFWRITE_SUPPORT */
1001
1002 #ifdef PDFLIB_TIFFWRITE_SUPPORT
1003 static void
Luv24fromLuv48(LogLuvState * sp,tidata_t op,int n)1004 Luv24fromLuv48(LogLuvState* sp, tidata_t op, int n)
1005 {
1006 uint32* luv = (uint32*) sp->tbuf;
1007 int16* luv3 = (int16*) op;
1008
1009 while (n-- > 0) {
1010 int Le, Ce;
1011
1012 if (luv3[0] <= 0)
1013 Le = 0;
1014 else if (luv3[0] >= (1<<12)+3314)
1015 Le = (1<<10) - 1;
1016 else if (sp->encode_meth == SGILOGENCODE_NODITHER)
1017 Le = (luv3[0]-3314) >> 2;
1018 else
1019 Le = itrunc(.25*(luv3[0]-3314.), sp->encode_meth);
1020
1021 Ce = uv_encode((luv3[1]+.5)/(1<<15), (luv3[2]+.5)/(1<<15),
1022 sp->encode_meth);
1023 if (Ce < 0) /* never happens */
1024 Ce = uv_encode(U_NEU, V_NEU, SGILOGENCODE_NODITHER);
1025 *luv++ = (uint32)Le << 14 | Ce;
1026 luv3 += 3;
1027 }
1028 }
1029 #endif /* PDFLIB_TIFFWRITE_SUPPORT */
1030
1031 #if !LOGLUV_PUBLIC
1032 static
1033 #endif
1034 void
LogLuv32toXYZ(uint32 p,float XYZ[3])1035 LogLuv32toXYZ(uint32 p, float XYZ[3])
1036 {
1037 double L, u, v, s, x, y;
1038 /* decode luminance */
1039 L = LogL16toY((int)p >> 16);
1040 if (L <= 0.) {
1041 XYZ[0] = XYZ[1] = XYZ[2] = 0.;
1042 return;
1043 }
1044 /* decode color */
1045 u = 1./UVSCALE * ((p>>8 & 0xff) + .5);
1046 v = 1./UVSCALE * ((p & 0xff) + .5);
1047 s = 1./(6.*u - 16.*v + 12.);
1048 x = 9.*u * s;
1049 y = 4.*v * s;
1050 /* convert to XYZ */
1051 XYZ[0] = (float)(x/y * L);
1052 XYZ[1] = (float)L;
1053 XYZ[2] = (float)((1.-x-y)/y * L);
1054 }
1055
1056 #ifdef PDFLIB_TIFFWRITE_SUPPORT
1057 #if !LOGLUV_PUBLIC
1058 static
1059 #endif
1060 uint32
LogLuv32fromXYZ(float XYZ[3],int em)1061 LogLuv32fromXYZ(float XYZ[3], int em)
1062 {
1063 unsigned int Le, ue, ve;
1064 double u, v, s;
1065 /* encode luminance */
1066 Le = (unsigned int)LogL16fromY(XYZ[1], em);
1067 /* encode color */
1068 s = XYZ[0] + 15.*XYZ[1] + 3.*XYZ[2];
1069 if (!Le || s <= 0.) {
1070 u = U_NEU;
1071 v = V_NEU;
1072 } else {
1073 u = 4.*XYZ[0] / s;
1074 v = 9.*XYZ[1] / s;
1075 }
1076 if (u <= 0.) ue = 0;
1077 else ue = itrunc(UVSCALE*u, em);
1078 if (ue > 255) ue = 255;
1079 if (v <= 0.) ve = 0;
1080 else ve = itrunc(UVSCALE*v, em);
1081 if (ve > 255) ve = 255;
1082 /* combine encodings */
1083 return (Le << 16 | ue << 8 | ve);
1084 }
1085 #endif /* PDFLIB_TIFFWRITE_SUPPORT */
1086
1087 static void
Luv32toXYZ(LogLuvState * sp,tidata_t op,int n)1088 Luv32toXYZ(LogLuvState* sp, tidata_t op, int n)
1089 {
1090 uint32* luv = (uint32*) sp->tbuf;
1091 float* xyz = (float*) op;
1092
1093 while (n-- > 0) {
1094 LogLuv32toXYZ(*luv++, xyz);
1095 xyz += 3;
1096 }
1097 }
1098
1099 static void
Luv32toLuv48(LogLuvState * sp,tidata_t op,int n)1100 Luv32toLuv48(LogLuvState* sp, tidata_t op, int n)
1101 {
1102 uint32* luv = (uint32*) sp->tbuf;
1103 int16* luv3 = (int16*) op;
1104
1105 while (n-- > 0) {
1106 double u, v;
1107
1108 *luv3++ = (int16)(*luv >> 16);
1109 u = 1./UVSCALE * ((*luv>>8 & 0xff) + .5);
1110 v = 1./UVSCALE * ((*luv & 0xff) + .5);
1111 *luv3++ = (int16)(u * (1L<<15));
1112 *luv3++ = (int16)(v * (1L<<15));
1113 luv++;
1114 }
1115 }
1116
1117 static void
Luv32toRGB(LogLuvState * sp,tidata_t op,int n)1118 Luv32toRGB(LogLuvState* sp, tidata_t op, int n)
1119 {
1120 uint32* luv = (uint32*) sp->tbuf;
1121 uint8* rgb = (uint8*) op;
1122
1123 while (n-- > 0) {
1124 float xyz[3];
1125
1126 LogLuv32toXYZ(*luv++, xyz);
1127 XYZtoRGB24(xyz, rgb);
1128 rgb += 3;
1129 }
1130 }
1131
1132 #ifdef PDFLIB_TIFFWRITE_SUPPORT
1133 static void
Luv32fromXYZ(LogLuvState * sp,tidata_t op,int n)1134 Luv32fromXYZ(LogLuvState* sp, tidata_t op, int n)
1135 {
1136 uint32* luv = (uint32*) sp->tbuf;
1137 float* xyz = (float*) op;
1138
1139 while (n-- > 0) {
1140 *luv++ = LogLuv32fromXYZ(xyz, sp->encode_meth);
1141 xyz += 3;
1142 }
1143 }
1144 #endif /* PDFLIB_TIFFWRITE_SUPPORT */
1145
1146 #ifdef PDFLIB_TIFFWRITE_SUPPORT
1147 static void
Luv32fromLuv48(LogLuvState * sp,tidata_t op,int n)1148 Luv32fromLuv48(LogLuvState* sp, tidata_t op, int n)
1149 {
1150 uint32* luv = (uint32*) sp->tbuf;
1151 int16* luv3 = (int16*) op;
1152
1153 if (sp->encode_meth == SGILOGENCODE_NODITHER) {
1154 while (n-- > 0) {
1155 *luv++ = (uint32)luv3[0] << 16 |
1156 (luv3[1]*(uint32)(UVSCALE+.5) >> 7 & 0xff00) |
1157 (luv3[2]*(uint32)(UVSCALE+.5) >> 15 & 0xff);
1158 luv3 += 3;
1159 }
1160 return;
1161 }
1162 while (n-- > 0) {
1163 *luv++ = (uint32)luv3[0] << 16 |
1164 (itrunc(luv3[1]*(UVSCALE/(1<<15)), sp->encode_meth) << 8 & 0xff00) |
1165 (itrunc(luv3[2]*(UVSCALE/(1<<15)), sp->encode_meth) & 0xff);
1166 luv3 += 3;
1167 }
1168 }
1169 #endif /* PDFLIB_TIFFWRITE_SUPPORT */
1170
1171 static void
_logLuvNop(LogLuvState * sp,tidata_t op,int n)1172 _logLuvNop(LogLuvState* sp, tidata_t op, int n)
1173 {
1174 (void) sp; (void) op; (void) n;
1175 }
1176
1177 static int
LogL16GuessDataFmt(TIFFDirectory * td)1178 LogL16GuessDataFmt(TIFFDirectory *td)
1179 {
1180 #define PACK(s,b,f) (((b)<<6)|((s)<<3)|(f))
1181 switch (PACK(td->td_samplesperpixel, td->td_bitspersample,
1182 td->td_sampleformat)) {
1183 case PACK(1, 32, SAMPLEFORMAT_IEEEFP):
1184 return (SGILOGDATAFMT_FLOAT);
1185 case PACK(1, 16, SAMPLEFORMAT_VOID):
1186 case PACK(1, 16, SAMPLEFORMAT_INT):
1187 case PACK(1, 16, SAMPLEFORMAT_UINT):
1188 return (SGILOGDATAFMT_16BIT);
1189 case PACK(1, 8, SAMPLEFORMAT_VOID):
1190 case PACK(1, 8, SAMPLEFORMAT_UINT):
1191 return (SGILOGDATAFMT_8BIT);
1192 }
1193 #undef PACK
1194 return (SGILOGDATAFMT_UNKNOWN);
1195 }
1196
1197 static uint32
multiply(size_t m1,size_t m2)1198 multiply(size_t m1, size_t m2)
1199 {
1200 uint32 bytes = m1 * m2;
1201
1202 if (m1 && bytes / m1 != m2)
1203 bytes = 0;
1204
1205 return bytes;
1206 }
1207
1208 static int
LogL16InitState(TIFF * tif)1209 LogL16InitState(TIFF* tif)
1210 {
1211 TIFFDirectory *td = &tif->tif_dir;
1212 LogLuvState* sp = DecoderState(tif);
1213 static const char module[] = "LogL16InitState";
1214
1215 assert(sp != NULL);
1216 assert(td->td_photometric == PHOTOMETRIC_LOGL);
1217
1218 /* for some reason, we can't do this in TIFFInitLogL16 */
1219 if (sp->user_datafmt == SGILOGDATAFMT_UNKNOWN)
1220 sp->user_datafmt = LogL16GuessDataFmt(td);
1221 switch (sp->user_datafmt) {
1222 case SGILOGDATAFMT_FLOAT:
1223 sp->pixel_size = sizeof (float);
1224 break;
1225 case SGILOGDATAFMT_16BIT:
1226 sp->pixel_size = sizeof (int16);
1227 break;
1228 case SGILOGDATAFMT_8BIT:
1229 sp->pixel_size = sizeof (uint8);
1230 break;
1231 default:
1232 _TIFFError(tif, tif->tif_name,
1233 "No support for converting user data format to LogL");
1234 return (0);
1235 }
1236 sp->tbuflen = multiply(td->td_imagewidth, td->td_rowsperstrip);
1237 if (multiply(sp->tbuflen, sizeof (int16)) == 0 ||
1238 (sp->tbuf = (tidata_t*)
1239 _TIFFmalloc(sp->tbuflen * sizeof (int16))) == NULL) {
1240 _TIFFError(tif, module,
1241 "%s: No space for SGILog translation buffer",
1242 tif->tif_name);
1243 return (0);
1244 }
1245 return (1);
1246 }
1247
1248 static int
LogLuvGuessDataFmt(TIFFDirectory * td)1249 LogLuvGuessDataFmt(TIFFDirectory *td)
1250 {
1251 int guess;
1252
1253 /*
1254 * If the user didn't tell us their datafmt,
1255 * take our best guess from the bitspersample.
1256 */
1257 #define PACK(a,b) (((a)<<3)|(b))
1258 switch (PACK(td->td_bitspersample, td->td_sampleformat)) {
1259 case PACK(32, SAMPLEFORMAT_IEEEFP):
1260 guess = SGILOGDATAFMT_FLOAT;
1261 break;
1262 case PACK(32, SAMPLEFORMAT_VOID):
1263 case PACK(32, SAMPLEFORMAT_UINT):
1264 case PACK(32, SAMPLEFORMAT_INT):
1265 guess = SGILOGDATAFMT_RAW;
1266 break;
1267 case PACK(16, SAMPLEFORMAT_VOID):
1268 case PACK(16, SAMPLEFORMAT_INT):
1269 case PACK(16, SAMPLEFORMAT_UINT):
1270 guess = SGILOGDATAFMT_16BIT;
1271 break;
1272 case PACK( 8, SAMPLEFORMAT_VOID):
1273 case PACK( 8, SAMPLEFORMAT_UINT):
1274 guess = SGILOGDATAFMT_8BIT;
1275 break;
1276 default:
1277 guess = SGILOGDATAFMT_UNKNOWN;
1278 break;
1279 #undef PACK
1280 }
1281 /*
1282 * Double-check samples per pixel.
1283 */
1284 switch (td->td_samplesperpixel) {
1285 case 1:
1286 if (guess != SGILOGDATAFMT_RAW)
1287 guess = SGILOGDATAFMT_UNKNOWN;
1288 break;
1289 case 3:
1290 if (guess == SGILOGDATAFMT_RAW)
1291 guess = SGILOGDATAFMT_UNKNOWN;
1292 break;
1293 default:
1294 guess = SGILOGDATAFMT_UNKNOWN;
1295 break;
1296 }
1297 return (guess);
1298 }
1299
1300 static int
LogLuvInitState(TIFF * tif)1301 LogLuvInitState(TIFF* tif)
1302 {
1303 TIFFDirectory* td = &tif->tif_dir;
1304 LogLuvState* sp = DecoderState(tif);
1305 static const char module[] = "LogLuvInitState";
1306
1307 assert(sp != NULL);
1308 assert(td->td_photometric == PHOTOMETRIC_LOGLUV);
1309
1310 /* for some reason, we can't do this in TIFFInitLogLuv */
1311 if (td->td_planarconfig != PLANARCONFIG_CONTIG) {
1312 _TIFFError(tif, module,
1313 "SGILog compression cannot handle non-contiguous data");
1314 return (0);
1315 }
1316 if (sp->user_datafmt == SGILOGDATAFMT_UNKNOWN)
1317 sp->user_datafmt = LogLuvGuessDataFmt(td);
1318 switch (sp->user_datafmt) {
1319 case SGILOGDATAFMT_FLOAT:
1320 sp->pixel_size = 3*sizeof (float);
1321 break;
1322 case SGILOGDATAFMT_16BIT:
1323 sp->pixel_size = 3*sizeof (int16);
1324 break;
1325 case SGILOGDATAFMT_RAW:
1326 sp->pixel_size = sizeof (uint32);
1327 break;
1328 case SGILOGDATAFMT_8BIT:
1329 sp->pixel_size = 3*sizeof (uint8);
1330 break;
1331 default:
1332 _TIFFError(tif, tif->tif_name,
1333 "No support for converting user data format to LogLuv");
1334 return (0);
1335 }
1336 sp->tbuflen = multiply(td->td_imagewidth, td->td_rowsperstrip);
1337 if (multiply(sp->tbuflen, sizeof (uint32)) == 0 ||
1338 (sp->tbuf = (tidata_t*)
1339 _TIFFmalloc(sp->tbuflen * sizeof (uint32))) == NULL) {
1340 _TIFFError(tif, module,
1341 "%s: No space for SGILog translation buffer",
1342 tif->tif_name);
1343 return (0);
1344 }
1345 return (1);
1346 }
1347
1348 static int
LogLuvSetupDecode(TIFF * tif)1349 LogLuvSetupDecode(TIFF* tif)
1350 {
1351 LogLuvState* sp = DecoderState(tif);
1352 TIFFDirectory* td = &tif->tif_dir;
1353
1354 tif->tif_postdecode = _TIFFNoPostDecode;
1355 switch (td->td_photometric) {
1356 case PHOTOMETRIC_LOGLUV:
1357 if (!LogLuvInitState(tif))
1358 break;
1359 if (td->td_compression == COMPRESSION_SGILOG24) {
1360 tif->tif_decoderow = LogLuvDecode24;
1361 switch (sp->user_datafmt) {
1362 case SGILOGDATAFMT_FLOAT:
1363 sp->tfunc = Luv24toXYZ;
1364 break;
1365 case SGILOGDATAFMT_16BIT:
1366 sp->tfunc = Luv24toLuv48;
1367 break;
1368 case SGILOGDATAFMT_8BIT:
1369 sp->tfunc = Luv24toRGB;
1370 break;
1371 }
1372 } else {
1373 tif->tif_decoderow = LogLuvDecode32;
1374 switch (sp->user_datafmt) {
1375 case SGILOGDATAFMT_FLOAT:
1376 sp->tfunc = Luv32toXYZ;
1377 break;
1378 case SGILOGDATAFMT_16BIT:
1379 sp->tfunc = Luv32toLuv48;
1380 break;
1381 case SGILOGDATAFMT_8BIT:
1382 sp->tfunc = Luv32toRGB;
1383 break;
1384 }
1385 }
1386 return (1);
1387 case PHOTOMETRIC_LOGL:
1388 if (!LogL16InitState(tif))
1389 break;
1390 tif->tif_decoderow = LogL16Decode;
1391 switch (sp->user_datafmt) {
1392 case SGILOGDATAFMT_FLOAT:
1393 sp->tfunc = L16toY;
1394 break;
1395 case SGILOGDATAFMT_8BIT:
1396 sp->tfunc = L16toGry;
1397 break;
1398 }
1399 return (1);
1400 default:
1401 _TIFFError(tif, tif->tif_name,
1402 "Inappropriate photometric interpretation %d for SGILog compression; %s",
1403 td->td_photometric, "must be either LogLUV or LogL");
1404 break;
1405 }
1406 return (0);
1407 }
1408
1409 #ifdef PDFLIB_TIFFWRITE_SUPPORT
1410 static int
LogLuvSetupEncode(TIFF * tif)1411 LogLuvSetupEncode(TIFF* tif)
1412 {
1413 LogLuvState* sp = EncoderState(tif);
1414 TIFFDirectory* td = &tif->tif_dir;
1415
1416 switch (td->td_photometric) {
1417 case PHOTOMETRIC_LOGLUV:
1418 if (!LogLuvInitState(tif))
1419 break;
1420 if (td->td_compression == COMPRESSION_SGILOG24) {
1421 tif->tif_encoderow = LogLuvEncode24;
1422 switch (sp->user_datafmt) {
1423 case SGILOGDATAFMT_FLOAT:
1424 sp->tfunc = Luv24fromXYZ;
1425 break;
1426 case SGILOGDATAFMT_16BIT:
1427 sp->tfunc = Luv24fromLuv48;
1428 break;
1429 case SGILOGDATAFMT_RAW:
1430 break;
1431 default:
1432 goto notsupported;
1433 }
1434 } else {
1435 tif->tif_encoderow = LogLuvEncode32;
1436 switch (sp->user_datafmt) {
1437 case SGILOGDATAFMT_FLOAT:
1438 sp->tfunc = Luv32fromXYZ;
1439 break;
1440 case SGILOGDATAFMT_16BIT:
1441 sp->tfunc = Luv32fromLuv48;
1442 break;
1443 case SGILOGDATAFMT_RAW:
1444 break;
1445 default:
1446 goto notsupported;
1447 }
1448 }
1449 break;
1450 case PHOTOMETRIC_LOGL:
1451 if (!LogL16InitState(tif))
1452 break;
1453 tif->tif_encoderow = LogL16Encode;
1454 switch (sp->user_datafmt) {
1455 case SGILOGDATAFMT_FLOAT:
1456 sp->tfunc = L16fromY;
1457 break;
1458 case SGILOGDATAFMT_16BIT:
1459 break;
1460 default:
1461 goto notsupported;
1462 }
1463 break;
1464 default:
1465 _TIFFError(tif, tif->tif_name,
1466 "Inappropriate photometric interpretation %d for SGILog compression; %s",
1467 td->td_photometric, "must be either LogLUV or LogL");
1468 break;
1469 }
1470 return (1);
1471 notsupported:
1472 _TIFFError(tif, tif->tif_name,
1473 "SGILog compression supported only for %s, or raw data",
1474 td->td_photometric == PHOTOMETRIC_LOGL ? "Y, L" : "XYZ, Luv");
1475 return (0);
1476 }
1477 #endif /* PDFLIB_TIFFWRITE_SUPPORT */
1478
1479 #ifdef PDFLIB_TIFFWRITE_SUPPORT
1480 static void
LogLuvClose(TIFF * tif)1481 LogLuvClose(TIFF* tif)
1482 {
1483 TIFFDirectory *td = &tif->tif_dir;
1484
1485 /*
1486 * For consistency, we always want to write out the same
1487 * bitspersample and sampleformat for our TIFF file,
1488 * regardless of the data format being used by the application.
1489 * Since this routine is called after tags have been set but
1490 * before they have been recorded in the file, we reset them here.
1491 */
1492 td->td_samplesperpixel =
1493 (td->td_photometric == PHOTOMETRIC_LOGL) ? 1 : 3;
1494 td->td_bitspersample = 16;
1495 td->td_sampleformat = SAMPLEFORMAT_INT;
1496 }
1497 #endif /* PDFLIB_TIFFWRITE_SUPPORT */
1498
1499 static void
LogLuvCleanup(TIFF * tif)1500 LogLuvCleanup(TIFF* tif)
1501 {
1502 LogLuvState* sp = (LogLuvState *)tif->tif_data;
1503
1504 if (sp) {
1505 if (sp->tbuf)
1506 _TIFFfree(sp->tbuf);
1507 _TIFFfree(sp);
1508 tif->tif_data = NULL;
1509 }
1510 }
1511
1512 static int
LogLuvVSetField(TIFF * tif,ttag_t tag,va_list ap)1513 LogLuvVSetField(TIFF* tif, ttag_t tag, va_list ap)
1514 {
1515 LogLuvState* sp = DecoderState(tif);
1516 int bps, fmt;
1517
1518 switch (tag) {
1519 case TIFFTAG_SGILOGDATAFMT:
1520 sp->user_datafmt = va_arg(ap, int);
1521 /*
1522 * Tweak the TIFF header so that the rest of libtiff knows what
1523 * size of data will be passed between app and library, and
1524 * assume that the app knows what it is doing and is not
1525 * confused by these header manipulations...
1526 */
1527 switch (sp->user_datafmt) {
1528 case SGILOGDATAFMT_FLOAT:
1529 bps = 32, fmt = SAMPLEFORMAT_IEEEFP;
1530 break;
1531 case SGILOGDATAFMT_16BIT:
1532 bps = 16, fmt = SAMPLEFORMAT_INT;
1533 break;
1534 case SGILOGDATAFMT_RAW:
1535 bps = 32, fmt = SAMPLEFORMAT_UINT;
1536 TIFFSetField(tif, TIFFTAG_SAMPLESPERPIXEL, 1);
1537 break;
1538 case SGILOGDATAFMT_8BIT:
1539 bps = 8, fmt = SAMPLEFORMAT_UINT;
1540 break;
1541 default:
1542 _TIFFError(tif, tif->tif_name,
1543 "Unknown data format %d for LogLuv compression",
1544 sp->user_datafmt);
1545 return (0);
1546 }
1547 TIFFSetField(tif, TIFFTAG_BITSPERSAMPLE, bps);
1548 TIFFSetField(tif, TIFFTAG_SAMPLEFORMAT, fmt);
1549 /*
1550 * Must recalculate sizes should bits/sample change.
1551 */
1552 tif->tif_tilesize = isTiled(tif) ? TIFFTileSize(tif)
1553 : (tsize_t) -1;
1554 tif->tif_scanlinesize = TIFFScanlineSize(tif);
1555 return (1);
1556 case TIFFTAG_SGILOGENCODE:
1557 sp->encode_meth = va_arg(ap, int);
1558 if (sp->encode_meth != SGILOGENCODE_NODITHER &&
1559 sp->encode_meth != SGILOGENCODE_RANDITHER) {
1560 _TIFFError(tif, tif->tif_name,
1561 "Unknown encoding %d for LogLuv compression",
1562 sp->encode_meth);
1563 return (0);
1564 }
1565 return (1);
1566 default:
1567 return (*sp->vsetparent)(tif, tag, ap);
1568 }
1569 }
1570
1571 static int
LogLuvVGetField(TIFF * tif,ttag_t tag,va_list ap)1572 LogLuvVGetField(TIFF* tif, ttag_t tag, va_list ap)
1573 {
1574 LogLuvState *sp = (LogLuvState *)tif->tif_data;
1575
1576 switch (tag) {
1577 case TIFFTAG_SGILOGDATAFMT:
1578 *va_arg(ap, int*) = sp->user_datafmt;
1579 return (1);
1580 default:
1581 return (*sp->vgetparent)(tif, tag, ap);
1582 }
1583 }
1584
1585 static const TIFFFieldInfo LogLuvFieldInfo[] = {
1586 { TIFFTAG_SGILOGDATAFMT, 0, 0, TIFF_SHORT, FIELD_PSEUDO,
1587 TRUE, FALSE, "SGILogDataFmt"},
1588 { TIFFTAG_SGILOGENCODE, 0, 0, TIFF_SHORT, FIELD_PSEUDO,
1589 TRUE, FALSE, "SGILogEncode"}
1590 };
1591
1592 int
TIFFInitSGILog(TIFF * tif,int scheme)1593 TIFFInitSGILog(TIFF* tif, int scheme)
1594 {
1595 static const char module[] = "TIFFInitSGILog";
1596 LogLuvState* sp;
1597
1598 assert(scheme == COMPRESSION_SGILOG24 || scheme == COMPRESSION_SGILOG);
1599
1600 /*
1601 * Allocate state block so tag methods have storage to record values.
1602 */
1603 tif->tif_data = (tidata_t) _TIFFmalloc(sizeof (LogLuvState));
1604 if (tif->tif_data == NULL)
1605 goto bad;
1606 sp = (LogLuvState*) tif->tif_data;
1607 _TIFFmemset((tdata_t)sp, 0, sizeof (*sp));
1608 sp->user_datafmt = SGILOGDATAFMT_UNKNOWN;
1609 sp->encode_meth = (scheme == COMPRESSION_SGILOG24) ?
1610 SGILOGENCODE_RANDITHER : SGILOGENCODE_NODITHER;
1611 sp->tfunc = _logLuvNop;
1612
1613 /*
1614 * Install codec methods.
1615 * NB: tif_decoderow & tif_encoderow are filled
1616 * in at setup time.
1617 */
1618 tif->tif_setupdecode = LogLuvSetupDecode;
1619 tif->tif_decodestrip = LogLuvDecodeStrip;
1620 tif->tif_decodetile = LogLuvDecodeTile;
1621 #ifdef PDFLIB_TIFFWRITE_SUPPORT
1622 tif->tif_setupencode = LogLuvSetupEncode;
1623 tif->tif_encodestrip = LogLuvEncodeStrip;
1624 tif->tif_encodetile = LogLuvEncodeTile;
1625 tif->tif_close = LogLuvClose;
1626 #endif /* PDFLIB_TIFFWRITE_SUPPORT */
1627 tif->tif_cleanup = LogLuvCleanup;
1628
1629 /* override SetField so we can handle our private pseudo-tag */
1630 TIFFMergeFieldInfo(tif, LogLuvFieldInfo, N(LogLuvFieldInfo));
1631 sp->vgetparent = tif->tif_tagmethods.vgetfield;
1632 tif->tif_tagmethods.vgetfield = LogLuvVGetField;/*hook for codec tags */
1633 sp->vsetparent = tif->tif_tagmethods.vsetfield;
1634 tif->tif_tagmethods.vsetfield = LogLuvVSetField;/*hook for codec tags */
1635
1636 return (1);
1637 bad:
1638 _TIFFError(tif, module, "%s: No space for LogLuv state block",
1639 tif->tif_name);
1640 return (0);
1641 }
1642 #endif /* LOGLUV_SUPPORT */
1643
1644 /* vim: set ts=8 sts=8 sw=8 noet: */
1645