Line data Source code
1 : /*
2 : * Copyright (c) 1997 Greg Ward Larson
3 : * Copyright (c) 1997 Silicon Graphics, Inc.
4 : *
5 : * Permission to use, copy, modify, distribute, and sell this software and
6 : * its documentation for any purpose is hereby granted without fee, provided
7 : * that (i) the above copyright notices and this permission notice appear in
8 : * all copies of the software and related documentation, and (ii) the names of
9 : * Sam Leffler, Greg Larson and Silicon Graphics may not be used in any
10 : * advertising or publicity relating to the software without the specific,
11 : * prior written permission of Sam Leffler, Greg Larson and Silicon Graphics.
12 : *
13 : * THE SOFTWARE IS PROVIDED "AS-IS" AND WITHOUT WARRANTY OF ANY KIND,
14 : * EXPRESS, IMPLIED OR OTHERWISE, INCLUDING WITHOUT LIMITATION, ANY
15 : * WARRANTY OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE.
16 : *
17 : * IN NO EVENT SHALL SAM LEFFLER, GREG LARSON OR SILICON GRAPHICS BE LIABLE
18 : * FOR ANY SPECIAL, INCIDENTAL, INDIRECT OR CONSEQUENTIAL DAMAGES OF ANY KIND,
19 : * OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
20 : * WHETHER OR NOT ADVISED OF THE POSSIBILITY OF DAMAGE, AND ON ANY THEORY OF
21 : * LIABILITY, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
22 : * OF THIS SOFTWARE.
23 : */
24 :
25 : #include "tiffiop.h"
26 : #ifdef LOGLUV_SUPPORT
27 :
28 : /*
29 : * TIFF Library.
30 : * LogLuv compression support for high dynamic range images.
31 : *
32 : * Contributed by Greg Larson.
33 : *
34 : * LogLuv image support uses the TIFF library to store 16 or 10-bit
35 : * log luminance values with 8 bits each of u and v or a 14-bit index.
36 : *
37 : * The codec can take as input and produce as output 32-bit IEEE float values
38 : * as well as 16-bit integer values. A 16-bit luminance is interpreted
39 : * as a sign bit followed by a 15-bit integer that is converted
40 : * to and from a linear magnitude using the transformation:
41 : *
42 : * L = 2^( (Le+.5)/256 - 64 ) # real from 15-bit
43 : *
44 : * Le = floor( 256*(log2(L) + 64) ) # 15-bit from real
45 : *
46 : * The actual conversion to world luminance units in candelas per sq. meter
47 : * requires an additional multiplier, which is stored in the TIFFTAG_STONITS.
48 : * This value is usually set such that a reasonable exposure comes from
49 : * clamping decoded luminances above 1 to 1 in the displayed image.
50 : *
51 : * The 16-bit values for u and v may be converted to real values by dividing
52 : * each by 32768. (This allows for negative values, which aren't useful as
53 : * far as we know, but are left in case of future improvements in human
54 : * color vision.)
55 : *
56 : * Conversion from (u,v), which is actually the CIE (u',v') system for
57 : * you color scientists, is accomplished by the following transformation:
58 : *
59 : * u = 4*x / (-2*x + 12*y + 3)
60 : * v = 9*y / (-2*x + 12*y + 3)
61 : *
62 : * x = 9*u / (6*u - 16*v + 12)
63 : * y = 4*v / (6*u - 16*v + 12)
64 : *
65 : * This process is greatly simplified by passing 32-bit IEEE floats
66 : * for each of three CIE XYZ coordinates. The codec then takes care
67 : * of conversion to and from LogLuv, though the application is still
68 : * responsible for interpreting the TIFFTAG_STONITS calibration factor.
69 : *
70 : * By definition, a CIE XYZ vector of [1 1 1] corresponds to a neutral white
71 : * point of (x,y)=(1/3,1/3). However, most color systems assume some other
72 : * white point, such as D65, and an absolute color conversion to XYZ then
73 : * to another color space with a different white point may introduce an
74 : * unwanted color cast to the image. It is often desirable, therefore, to
75 : * perform a white point conversion that maps the input white to [1 1 1]
76 : * in XYZ, then record the original white point using the TIFFTAG_WHITEPOINT
77 : * tag value. A decoder that demands absolute color calibration may use
78 : * this white point tag to get back the original colors, but usually it
79 : * will be ignored and the new white point will be used instead that
80 : * matches the output color space.
81 : *
82 : * Pixel information is compressed into one of two basic encodings, depending
83 : * on the setting of the compression tag, which is one of COMPRESSION_SGILOG
84 : * or COMPRESSION_SGILOG24. For COMPRESSION_SGILOG, greyscale data is
85 : * stored as:
86 : *
87 : * 1 15
88 : * |-+---------------|
89 : *
90 : * COMPRESSION_SGILOG color data is stored as:
91 : *
92 : * 1 15 8 8
93 : * |-+---------------|--------+--------|
94 : * S Le ue ve
95 : *
96 : * For the 24-bit COMPRESSION_SGILOG24 color format, the data is stored as:
97 : *
98 : * 10 14
99 : * |----------|--------------|
100 : * Le' Ce
101 : *
102 : * There is no sign bit in the 24-bit case, and the (u,v) chromaticity is
103 : * encoded as an index for optimal color resolution. The 10 log bits are
104 : * defined by the following conversions:
105 : *
106 : * L = 2^((Le'+.5)/64 - 12) # real from 10-bit
107 : *
108 : * Le' = floor( 64*(log2(L) + 12) ) # 10-bit from real
109 : *
110 : * The 10 bits of the smaller format may be converted into the 15 bits of
111 : * the larger format by multiplying by 4 and adding 13314. Obviously,
112 : * a smaller range of magnitudes is covered (about 5 orders of magnitude
113 : * instead of 38), and the lack of a sign bit means that negative luminances
114 : * are not allowed. (Well, they aren't allowed in the real world, either,
115 : * but they are useful for certain types of image processing.)
116 : *
117 : * The desired user format is controlled by the setting the internal
118 : * pseudo tag TIFFTAG_SGILOGDATAFMT to one of:
119 : * SGILOGDATAFMT_FLOAT = IEEE 32-bit float XYZ values
120 : * SGILOGDATAFMT_16BIT = 16-bit integer encodings of logL, u and v
121 : * Raw data i/o is also possible using:
122 : * SGILOGDATAFMT_RAW = 32-bit unsigned integer with encoded pixel
123 : * In addition, the following decoding is provided for ease of display:
124 : * SGILOGDATAFMT_8BIT = 8-bit default RGB gamma-corrected values
125 : *
126 : * For grayscale images, we provide the following data formats:
127 : * SGILOGDATAFMT_FLOAT = IEEE 32-bit float Y values
128 : * SGILOGDATAFMT_16BIT = 16-bit integer w/ encoded luminance
129 : * SGILOGDATAFMT_8BIT = 8-bit gray monitor values
130 : *
131 : * Note that the COMPRESSION_SGILOG applies a simple run-length encoding
132 : * scheme by separating the logL, u and v bytes for each row and applying
133 : * a PackBits type of compression. Since the 24-bit encoding is not
134 : * adaptive, the 32-bit color format takes less space in many cases.
135 : *
136 : * Further control is provided over the conversion from higher-resolution
137 : * formats to final encoded values through the pseudo tag
138 : * TIFFTAG_SGILOGENCODE:
139 : * SGILOGENCODE_NODITHER = do not dither encoded values
140 : * SGILOGENCODE_RANDITHER = apply random dithering during encoding
141 : *
142 : * The default value of this tag is SGILOGENCODE_NODITHER for
143 : * COMPRESSION_SGILOG to maximize run-length encoding and
144 : * SGILOGENCODE_RANDITHER for COMPRESSION_SGILOG24 to turn
145 : * quantization errors into noise.
146 : */
147 :
148 : #include <math.h>
149 : #include <stdio.h>
150 : #include <stdlib.h>
151 :
152 : /*
153 : * State block for each open TIFF
154 : * file using LogLuv compression/decompression.
155 : */
156 : typedef struct logLuvState LogLuvState;
157 :
158 : struct logLuvState
159 : {
160 : int encoder_state; /* 1 if encoder correctly initialized */
161 : int user_datafmt; /* user data format */
162 : int encode_meth; /* encoding method */
163 : int pixel_size; /* bytes per pixel */
164 :
165 : uint8_t *tbuf; /* translation buffer */
166 : tmsize_t tbuflen; /* buffer length */
167 : void (*tfunc)(LogLuvState *, uint8_t *, 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 40 : static int LogL16Decode(TIFF *tif, uint8_t *op, tmsize_t occ, uint16_t s)
184 : {
185 : static const char module[] = "LogL16Decode";
186 40 : LogLuvState *sp = DecoderState(tif);
187 : int shft;
188 : tmsize_t i;
189 : tmsize_t npixels;
190 : unsigned char *bp;
191 : int16_t *tp;
192 : int16_t b;
193 : tmsize_t cc;
194 : int rc;
195 :
196 : (void)s;
197 40 : assert(s == 0);
198 40 : assert(sp != NULL);
199 :
200 40 : npixels = occ / sp->pixel_size;
201 :
202 40 : if (sp->user_datafmt == SGILOGDATAFMT_16BIT)
203 20 : tp = (int16_t *)op;
204 : else
205 : {
206 20 : if (sp->tbuflen < npixels)
207 : {
208 0 : TIFFErrorExtR(tif, module, "Translation buffer too short");
209 0 : return (0);
210 : }
211 20 : tp = (int16_t *)sp->tbuf;
212 : }
213 40 : _TIFFmemset((void *)tp, 0, npixels * sizeof(tp[0]));
214 :
215 40 : bp = (unsigned char *)tif->tif_rawcp;
216 40 : cc = tif->tif_rawcc;
217 : /* get each byte string */
218 120 : for (shft = 8; shft >= 0; shft -= 8)
219 : {
220 168 : for (i = 0; i < npixels && cc > 0;)
221 : {
222 88 : if (*bp >= 128)
223 : { /* run */
224 44 : if (cc < 2)
225 0 : break;
226 44 : rc = *bp++ + (2 - 128);
227 44 : b = (int16_t)(*bp++ << shft);
228 44 : cc -= 2;
229 862 : while (rc-- && i < npixels)
230 818 : tp[i++] |= b;
231 : }
232 : else
233 : { /* non-run */
234 44 : rc = *bp++; /* nul is noop */
235 826 : while (--cc && rc-- && i < npixels)
236 782 : tp[i++] |= (int16_t)*bp++ << shft;
237 : }
238 : }
239 80 : if (i != npixels)
240 : {
241 0 : TIFFErrorExtR(tif, module,
242 : "Not enough data at row %" PRIu32
243 : " (short %" TIFF_SSIZE_FORMAT " pixels)",
244 : tif->tif_row, npixels - i);
245 0 : tif->tif_rawcp = (uint8_t *)bp;
246 0 : tif->tif_rawcc = cc;
247 0 : return (0);
248 : }
249 : }
250 40 : (*sp->tfunc)(sp, op, npixels);
251 40 : tif->tif_rawcp = (uint8_t *)bp;
252 40 : tif->tif_rawcc = cc;
253 40 : return (1);
254 : }
255 :
256 : /*
257 : * Decode a string of 24-bit pixels.
258 : */
259 0 : static int LogLuvDecode24(TIFF *tif, uint8_t *op, tmsize_t occ, uint16_t s)
260 : {
261 : static const char module[] = "LogLuvDecode24";
262 0 : LogLuvState *sp = DecoderState(tif);
263 : tmsize_t cc;
264 : tmsize_t i;
265 : tmsize_t npixels;
266 : unsigned char *bp;
267 : uint32_t *tp;
268 :
269 : (void)s;
270 0 : assert(s == 0);
271 0 : assert(sp != NULL);
272 :
273 0 : npixels = occ / sp->pixel_size;
274 :
275 0 : if (sp->user_datafmt == SGILOGDATAFMT_RAW)
276 0 : tp = (uint32_t *)op;
277 : else
278 : {
279 0 : if (sp->tbuflen < npixels)
280 : {
281 0 : TIFFErrorExtR(tif, module, "Translation buffer too short");
282 0 : return (0);
283 : }
284 0 : tp = (uint32_t *)sp->tbuf;
285 : }
286 : /* copy to array of uint32_t */
287 0 : bp = (unsigned char *)tif->tif_rawcp;
288 0 : cc = tif->tif_rawcc;
289 0 : for (i = 0; i < npixels && cc >= 3; i++)
290 : {
291 0 : tp[i] = bp[0] << 16 | bp[1] << 8 | bp[2];
292 0 : bp += 3;
293 0 : cc -= 3;
294 : }
295 0 : tif->tif_rawcp = (uint8_t *)bp;
296 0 : tif->tif_rawcc = cc;
297 0 : if (i != npixels)
298 : {
299 0 : TIFFErrorExtR(tif, module,
300 : "Not enough data at row %" PRIu32
301 : " (short %" TIFF_SSIZE_FORMAT " pixels)",
302 : tif->tif_row, npixels - i);
303 0 : return (0);
304 : }
305 0 : (*sp->tfunc)(sp, op, npixels);
306 0 : return (1);
307 : }
308 :
309 : /*
310 : * Decode a string of 32-bit pixels.
311 : */
312 0 : static int LogLuvDecode32(TIFF *tif, uint8_t *op, tmsize_t occ, uint16_t s)
313 : {
314 : static const char module[] = "LogLuvDecode32";
315 : LogLuvState *sp;
316 : int shft;
317 : tmsize_t i;
318 : tmsize_t npixels;
319 : unsigned char *bp;
320 : uint32_t *tp;
321 : uint32_t b;
322 : tmsize_t cc;
323 : int rc;
324 :
325 : (void)s;
326 0 : assert(s == 0);
327 0 : sp = DecoderState(tif);
328 0 : assert(sp != NULL);
329 :
330 0 : npixels = occ / sp->pixel_size;
331 :
332 0 : if (sp->user_datafmt == SGILOGDATAFMT_RAW)
333 0 : tp = (uint32_t *)op;
334 : else
335 : {
336 0 : if (sp->tbuflen < npixels)
337 : {
338 0 : TIFFErrorExtR(tif, module, "Translation buffer too short");
339 0 : return (0);
340 : }
341 0 : tp = (uint32_t *)sp->tbuf;
342 : }
343 0 : _TIFFmemset((void *)tp, 0, npixels * sizeof(tp[0]));
344 :
345 0 : bp = (unsigned char *)tif->tif_rawcp;
346 0 : cc = tif->tif_rawcc;
347 : /* get each byte string */
348 0 : for (shft = 24; shft >= 0; shft -= 8)
349 : {
350 0 : for (i = 0; i < npixels && cc > 0;)
351 : {
352 0 : if (*bp >= 128)
353 : { /* run */
354 0 : if (cc < 2)
355 0 : break;
356 0 : rc = *bp++ + (2 - 128);
357 0 : b = (uint32_t)*bp++ << shft;
358 0 : cc -= 2;
359 0 : while (rc-- && i < npixels)
360 0 : tp[i++] |= b;
361 : }
362 : else
363 : { /* non-run */
364 0 : rc = *bp++; /* nul is noop */
365 0 : while (--cc && rc-- && i < npixels)
366 0 : tp[i++] |= (uint32_t)*bp++ << shft;
367 : }
368 : }
369 0 : if (i != npixels)
370 : {
371 0 : TIFFErrorExtR(tif, module,
372 : "Not enough data at row %" PRIu32
373 : " (short %" TIFF_SSIZE_FORMAT " pixels)",
374 : tif->tif_row, npixels - i);
375 0 : tif->tif_rawcp = (uint8_t *)bp;
376 0 : tif->tif_rawcc = cc;
377 0 : return (0);
378 : }
379 : }
380 0 : (*sp->tfunc)(sp, op, npixels);
381 0 : tif->tif_rawcp = (uint8_t *)bp;
382 0 : tif->tif_rawcc = cc;
383 0 : return (1);
384 : }
385 :
386 : /*
387 : * Decode a strip of pixels. We break it into rows to
388 : * maintain synchrony with the encode algorithm, which
389 : * is row by row.
390 : */
391 2 : static int LogLuvDecodeStrip(TIFF *tif, uint8_t *bp, tmsize_t cc, uint16_t s)
392 : {
393 2 : tmsize_t rowlen = TIFFScanlineSize(tif);
394 :
395 2 : if (rowlen == 0)
396 0 : return 0;
397 :
398 2 : assert(cc % rowlen == 0);
399 42 : while (cc && (*tif->tif_decoderow)(tif, bp, rowlen, s))
400 : {
401 40 : bp += rowlen;
402 40 : cc -= rowlen;
403 : }
404 2 : return (cc == 0);
405 : }
406 :
407 : /*
408 : * Decode a tile of pixels. We break it into rows to
409 : * maintain synchrony with the encode algorithm, which
410 : * is row by row.
411 : */
412 0 : static int LogLuvDecodeTile(TIFF *tif, uint8_t *bp, tmsize_t cc, uint16_t s)
413 : {
414 0 : tmsize_t rowlen = TIFFTileRowSize(tif);
415 :
416 0 : if (rowlen == 0)
417 0 : return 0;
418 :
419 0 : assert(cc % rowlen == 0);
420 0 : while (cc && (*tif->tif_decoderow)(tif, bp, rowlen, s))
421 : {
422 0 : bp += rowlen;
423 0 : cc -= rowlen;
424 : }
425 0 : return (cc == 0);
426 : }
427 :
428 : /*
429 : * Encode a row of 16-bit pixels.
430 : */
431 0 : static int LogL16Encode(TIFF *tif, uint8_t *bp, tmsize_t cc, uint16_t s)
432 : {
433 : static const char module[] = "LogL16Encode";
434 0 : LogLuvState *sp = EncoderState(tif);
435 : int shft;
436 : tmsize_t i;
437 : tmsize_t j;
438 : tmsize_t npixels;
439 : uint8_t *op;
440 : int16_t *tp;
441 : int16_t b;
442 : tmsize_t occ;
443 0 : int rc = 0, mask;
444 : tmsize_t beg;
445 :
446 : (void)s;
447 0 : assert(s == 0);
448 0 : assert(sp != NULL);
449 0 : npixels = cc / sp->pixel_size;
450 :
451 0 : if (sp->user_datafmt == SGILOGDATAFMT_16BIT)
452 0 : tp = (int16_t *)bp;
453 : else
454 : {
455 0 : tp = (int16_t *)sp->tbuf;
456 0 : if (sp->tbuflen < npixels)
457 : {
458 0 : TIFFErrorExtR(tif, module, "Translation buffer too short");
459 0 : return (0);
460 : }
461 0 : (*sp->tfunc)(sp, bp, npixels);
462 : }
463 : /* compress each byte string */
464 0 : op = tif->tif_rawcp;
465 0 : occ = tif->tif_rawdatasize - tif->tif_rawcc;
466 0 : for (shft = 8; shft >= 0; shft -= 8)
467 : {
468 0 : for (i = 0; i < npixels; i += rc)
469 : {
470 0 : if (occ < 4)
471 : {
472 0 : tif->tif_rawcp = op;
473 0 : tif->tif_rawcc = tif->tif_rawdatasize - occ;
474 0 : if (!TIFFFlushData1(tif))
475 0 : return (0);
476 0 : op = tif->tif_rawcp;
477 0 : occ = tif->tif_rawdatasize - tif->tif_rawcc;
478 : }
479 0 : mask = 0xff << shft; /* find next run */
480 0 : for (beg = i; beg < npixels; beg += rc)
481 : {
482 0 : b = (int16_t)(tp[beg] & mask);
483 0 : rc = 1;
484 0 : while (rc < 127 + 2 && beg + rc < npixels &&
485 0 : (tp[beg + rc] & mask) == b)
486 0 : rc++;
487 0 : if (rc >= MINRUN)
488 0 : break; /* long enough */
489 : }
490 0 : if (beg - i > 1 && beg - i < MINRUN)
491 : {
492 0 : b = (int16_t)(tp[i] & mask); /*check short run */
493 0 : j = i + 1;
494 0 : while ((tp[j++] & mask) == b)
495 0 : if (j == beg)
496 : {
497 0 : *op++ = (uint8_t)(128 - 2 + j - i);
498 0 : *op++ = (uint8_t)(b >> shft);
499 0 : occ -= 2;
500 0 : i = beg;
501 0 : break;
502 : }
503 : }
504 0 : while (i < beg)
505 : { /* write out non-run */
506 0 : if ((j = beg - i) > 127)
507 0 : j = 127;
508 0 : if (occ < j + 3)
509 : {
510 0 : tif->tif_rawcp = op;
511 0 : tif->tif_rawcc = tif->tif_rawdatasize - occ;
512 0 : if (!TIFFFlushData1(tif))
513 0 : return (0);
514 0 : op = tif->tif_rawcp;
515 0 : occ = tif->tif_rawdatasize - tif->tif_rawcc;
516 : }
517 0 : *op++ = (uint8_t)j;
518 0 : occ--;
519 0 : while (j--)
520 : {
521 0 : *op++ = (uint8_t)(tp[i++] >> shft & 0xff);
522 0 : occ--;
523 : }
524 : }
525 0 : if (rc >= MINRUN)
526 : { /* write out run */
527 0 : *op++ = (uint8_t)(128 - 2 + rc);
528 0 : *op++ = (uint8_t)(tp[beg] >> shft & 0xff);
529 0 : occ -= 2;
530 : }
531 : else
532 0 : rc = 0;
533 : }
534 : }
535 0 : tif->tif_rawcp = op;
536 0 : tif->tif_rawcc = tif->tif_rawdatasize - occ;
537 :
538 0 : return (1);
539 : }
540 :
541 : /*
542 : * Encode a row of 24-bit pixels.
543 : */
544 0 : static int LogLuvEncode24(TIFF *tif, uint8_t *bp, tmsize_t cc, uint16_t s)
545 : {
546 : static const char module[] = "LogLuvEncode24";
547 0 : LogLuvState *sp = EncoderState(tif);
548 : tmsize_t i;
549 : tmsize_t npixels;
550 : tmsize_t occ;
551 : uint8_t *op;
552 : uint32_t *tp;
553 :
554 : (void)s;
555 0 : assert(s == 0);
556 0 : assert(sp != NULL);
557 0 : npixels = cc / sp->pixel_size;
558 :
559 0 : if (sp->user_datafmt == SGILOGDATAFMT_RAW)
560 0 : tp = (uint32_t *)bp;
561 : else
562 : {
563 0 : tp = (uint32_t *)sp->tbuf;
564 0 : if (sp->tbuflen < npixels)
565 : {
566 0 : TIFFErrorExtR(tif, module, "Translation buffer too short");
567 0 : return (0);
568 : }
569 0 : (*sp->tfunc)(sp, bp, npixels);
570 : }
571 : /* write out encoded pixels */
572 0 : op = tif->tif_rawcp;
573 0 : occ = tif->tif_rawdatasize - tif->tif_rawcc;
574 0 : for (i = npixels; i--;)
575 : {
576 0 : if (occ < 3)
577 : {
578 0 : tif->tif_rawcp = op;
579 0 : tif->tif_rawcc = tif->tif_rawdatasize - occ;
580 0 : if (!TIFFFlushData1(tif))
581 0 : return (0);
582 0 : op = tif->tif_rawcp;
583 0 : occ = tif->tif_rawdatasize - tif->tif_rawcc;
584 : }
585 0 : *op++ = (uint8_t)(*tp >> 16);
586 0 : *op++ = (uint8_t)(*tp >> 8 & 0xff);
587 0 : *op++ = (uint8_t)(*tp++ & 0xff);
588 0 : occ -= 3;
589 : }
590 0 : tif->tif_rawcp = op;
591 0 : tif->tif_rawcc = tif->tif_rawdatasize - occ;
592 :
593 0 : return (1);
594 : }
595 :
596 : /*
597 : * Encode a row of 32-bit pixels.
598 : */
599 0 : static int LogLuvEncode32(TIFF *tif, uint8_t *bp, tmsize_t cc, uint16_t s)
600 : {
601 : static const char module[] = "LogLuvEncode32";
602 0 : LogLuvState *sp = EncoderState(tif);
603 : int shft;
604 : tmsize_t i;
605 : tmsize_t j;
606 : tmsize_t npixels;
607 : uint8_t *op;
608 : uint32_t *tp;
609 : uint32_t b;
610 : tmsize_t occ;
611 0 : int rc = 0;
612 : tmsize_t beg;
613 :
614 : (void)s;
615 0 : assert(s == 0);
616 0 : assert(sp != NULL);
617 :
618 0 : npixels = cc / sp->pixel_size;
619 :
620 0 : if (sp->user_datafmt == SGILOGDATAFMT_RAW)
621 0 : tp = (uint32_t *)bp;
622 : else
623 : {
624 0 : tp = (uint32_t *)sp->tbuf;
625 0 : if (sp->tbuflen < npixels)
626 : {
627 0 : TIFFErrorExtR(tif, module, "Translation buffer too short");
628 0 : return (0);
629 : }
630 0 : (*sp->tfunc)(sp, bp, npixels);
631 : }
632 : /* compress each byte string */
633 0 : op = tif->tif_rawcp;
634 0 : occ = tif->tif_rawdatasize - tif->tif_rawcc;
635 0 : for (shft = 24; shft >= 0; shft -= 8)
636 : {
637 0 : const uint32_t mask = 0xffU << shft; /* find next run */
638 0 : for (i = 0; i < npixels; i += rc)
639 : {
640 0 : if (occ < 4)
641 : {
642 0 : tif->tif_rawcp = op;
643 0 : tif->tif_rawcc = tif->tif_rawdatasize - occ;
644 0 : if (!TIFFFlushData1(tif))
645 0 : return (0);
646 0 : op = tif->tif_rawcp;
647 0 : occ = tif->tif_rawdatasize - tif->tif_rawcc;
648 : }
649 0 : for (beg = i; beg < npixels; beg += rc)
650 : {
651 0 : b = tp[beg] & mask;
652 0 : rc = 1;
653 0 : while (rc < 127 + 2 && beg + rc < npixels &&
654 0 : (tp[beg + rc] & mask) == b)
655 0 : rc++;
656 0 : if (rc >= MINRUN)
657 0 : break; /* long enough */
658 : }
659 0 : if (beg - i > 1 && beg - i < MINRUN)
660 : {
661 0 : b = tp[i] & mask; /* check short run */
662 0 : j = i + 1;
663 0 : while ((tp[j++] & mask) == b)
664 0 : if (j == beg)
665 : {
666 0 : *op++ = (uint8_t)(128 - 2 + j - i);
667 0 : *op++ = (uint8_t)(b >> shft);
668 0 : occ -= 2;
669 0 : i = beg;
670 0 : break;
671 : }
672 : }
673 0 : while (i < beg)
674 : { /* write out non-run */
675 0 : if ((j = beg - i) > 127)
676 0 : j = 127;
677 0 : if (occ < j + 3)
678 : {
679 0 : tif->tif_rawcp = op;
680 0 : tif->tif_rawcc = tif->tif_rawdatasize - occ;
681 0 : if (!TIFFFlushData1(tif))
682 0 : return (0);
683 0 : op = tif->tif_rawcp;
684 0 : occ = tif->tif_rawdatasize - tif->tif_rawcc;
685 : }
686 0 : *op++ = (uint8_t)j;
687 0 : occ--;
688 0 : while (j--)
689 : {
690 0 : *op++ = (uint8_t)(tp[i++] >> shft & 0xff);
691 0 : occ--;
692 : }
693 : }
694 0 : if (rc >= MINRUN)
695 : { /* write out run */
696 0 : *op++ = (uint8_t)(128 - 2 + rc);
697 0 : *op++ = (uint8_t)(tp[beg] >> shft & 0xff);
698 0 : occ -= 2;
699 : }
700 : else
701 0 : rc = 0;
702 : }
703 : }
704 0 : tif->tif_rawcp = op;
705 0 : tif->tif_rawcc = tif->tif_rawdatasize - occ;
706 :
707 0 : return (1);
708 : }
709 :
710 : /*
711 : * Encode a strip of pixels. We break it into rows to
712 : * avoid encoding runs across row boundaries.
713 : */
714 0 : static int LogLuvEncodeStrip(TIFF *tif, uint8_t *bp, tmsize_t cc, uint16_t s)
715 : {
716 0 : tmsize_t rowlen = TIFFScanlineSize(tif);
717 :
718 0 : if (rowlen == 0)
719 0 : return 0;
720 :
721 0 : assert(cc % rowlen == 0);
722 0 : while (cc && (*tif->tif_encoderow)(tif, bp, rowlen, s) == 1)
723 : {
724 0 : bp += rowlen;
725 0 : cc -= rowlen;
726 : }
727 0 : return (cc == 0);
728 : }
729 :
730 : /*
731 : * Encode a tile of pixels. We break it into rows to
732 : * avoid encoding runs across row boundaries.
733 : */
734 0 : static int LogLuvEncodeTile(TIFF *tif, uint8_t *bp, tmsize_t cc, uint16_t s)
735 : {
736 0 : tmsize_t rowlen = TIFFTileRowSize(tif);
737 :
738 0 : if (rowlen == 0)
739 0 : return 0;
740 :
741 0 : assert(cc % rowlen == 0);
742 0 : while (cc && (*tif->tif_encoderow)(tif, bp, rowlen, s) == 1)
743 : {
744 0 : bp += rowlen;
745 0 : cc -= rowlen;
746 : }
747 0 : return (cc == 0);
748 : }
749 :
750 : /*
751 : * Encode/Decode functions for converting to and from user formats.
752 : */
753 :
754 : #include "uvcode.h"
755 :
756 : #ifndef UVSCALE
757 : #define U_NEU 0.210526316
758 : #define V_NEU 0.473684211
759 : #define UVSCALE 410.
760 : #endif
761 :
762 : #ifndef M_LN2
763 : #define M_LN2 0.69314718055994530942
764 : #endif
765 : #ifndef M_PI
766 : #define M_PI 3.14159265358979323846
767 : #endif
768 : #undef log2 /* Conflict with C'99 function */
769 : #define log2(x) ((1. / M_LN2) * log(x))
770 : #undef exp2 /* Conflict with C'99 function */
771 : #define exp2(x) exp(M_LN2 *(x))
772 :
773 0 : static int tiff_itrunc(double x, int m)
774 : {
775 0 : if (m == SGILOGENCODE_NODITHER)
776 0 : return (int)x;
777 : /* Silence CoverityScan warning about bad crypto function */
778 : /* coverity[dont_call] */
779 0 : return (int)(x + rand() * (1. / RAND_MAX) - .5);
780 : }
781 :
782 : #if !LOGLUV_PUBLIC
783 : static
784 : #endif
785 : double
786 400 : LogL16toY(int p16) /* compute luminance from 16-bit LogL */
787 : {
788 400 : int Le = p16 & 0x7fff;
789 : double Y;
790 :
791 400 : if (!Le)
792 0 : return (0.);
793 400 : Y = exp(M_LN2 / 256. * (Le + .5) - M_LN2 * 64.);
794 400 : return (!(p16 & 0x8000) ? Y : -Y);
795 : }
796 :
797 : #if !LOGLUV_PUBLIC
798 : static
799 : #endif
800 : int
801 0 : LogL16fromY(double Y, int em) /* get 16-bit LogL from Y */
802 : {
803 0 : if (Y >= 1.8371976e19)
804 0 : return (0x7fff);
805 0 : if (Y <= -1.8371976e19)
806 0 : return (0xffff);
807 0 : if (Y > 5.4136769e-20)
808 0 : return tiff_itrunc(256. * (log2(Y) + 64.), em);
809 0 : if (Y < -5.4136769e-20)
810 0 : return (~0x7fff | tiff_itrunc(256. * (log2(-Y) + 64.), em));
811 0 : return (0);
812 : }
813 :
814 0 : static void L16toY(LogLuvState *sp, uint8_t *op, tmsize_t n)
815 : {
816 0 : int16_t *l16 = (int16_t *)sp->tbuf;
817 0 : float *yp = (float *)op;
818 :
819 0 : while (n-- > 0)
820 0 : *yp++ = (float)LogL16toY(*l16++);
821 0 : }
822 :
823 20 : static void L16toGry(LogLuvState *sp, uint8_t *op, tmsize_t n)
824 : {
825 20 : int16_t *l16 = (int16_t *)sp->tbuf;
826 20 : uint8_t *gp = (uint8_t *)op;
827 :
828 420 : while (n-- > 0)
829 : {
830 400 : double Y = LogL16toY(*l16++);
831 800 : *gp++ = (uint8_t)((Y <= 0.) ? 0
832 : : (Y >= 1.) ? 255
833 400 : : (int)(256. * sqrt(Y)));
834 : }
835 20 : }
836 :
837 0 : static void L16fromY(LogLuvState *sp, uint8_t *op, tmsize_t n)
838 : {
839 0 : int16_t *l16 = (int16_t *)sp->tbuf;
840 0 : float *yp = (float *)op;
841 :
842 0 : while (n-- > 0)
843 0 : *l16++ = (int16_t)(LogL16fromY(*yp++, sp->encode_meth));
844 0 : }
845 :
846 : #if !LOGLUV_PUBLIC
847 : static
848 : #endif
849 : void
850 0 : XYZtoRGB24(float *xyz, uint8_t *rgb)
851 : {
852 : double r, g, b;
853 : /* assume CCIR-709 primaries */
854 0 : r = 2.690 * xyz[0] + -1.276 * xyz[1] + -0.414 * xyz[2];
855 0 : g = -1.022 * xyz[0] + 1.978 * xyz[1] + 0.044 * xyz[2];
856 0 : b = 0.061 * xyz[0] + -0.224 * xyz[1] + 1.163 * xyz[2];
857 : /* assume 2.0 gamma for speed */
858 : /* could use integer sqrt approx., but this is probably faster */
859 0 : rgb[0] = (uint8_t)((r <= 0.) ? 0 : (r >= 1.) ? 255 : (int)(256. * sqrt(r)));
860 0 : rgb[1] = (uint8_t)((g <= 0.) ? 0 : (g >= 1.) ? 255 : (int)(256. * sqrt(g)));
861 0 : rgb[2] = (uint8_t)((b <= 0.) ? 0 : (b >= 1.) ? 255 : (int)(256. * sqrt(b)));
862 0 : }
863 :
864 : #if !LOGLUV_PUBLIC
865 : static
866 : #endif
867 : double
868 0 : LogL10toY(int p10) /* compute luminance from 10-bit LogL */
869 : {
870 0 : if (p10 == 0)
871 0 : return (0.);
872 0 : return (exp(M_LN2 / 64. * (p10 + .5) - M_LN2 * 12.));
873 : }
874 :
875 : #if !LOGLUV_PUBLIC
876 : static
877 : #endif
878 : int
879 0 : LogL10fromY(double Y, int em) /* get 10-bit LogL from Y */
880 : {
881 0 : if (Y >= 15.742)
882 0 : return (0x3ff);
883 0 : else if (Y <= .00024283)
884 0 : return (0);
885 : else
886 0 : return tiff_itrunc(64. * (log2(Y) + 12.), em);
887 : }
888 :
889 : #define NANGLES 100
890 : #define uv2ang(u, v) \
891 : ((NANGLES * .499999999 / M_PI) * atan2((v)-V_NEU, (u)-U_NEU) + .5 * NANGLES)
892 :
893 0 : static int oog_encode(double u, double v) /* encode out-of-gamut chroma */
894 : {
895 : static int oog_table[NANGLES];
896 : static int initialized = 0;
897 : register int i;
898 :
899 0 : if (!initialized)
900 : { /* set up perimeter table */
901 : double eps[NANGLES], ua, va, ang, epsa;
902 : int ui, vi, ustep;
903 0 : for (i = NANGLES; i--;)
904 0 : eps[i] = 2.;
905 0 : for (vi = UV_NVS; vi--;)
906 : {
907 0 : va = UV_VSTART + (vi + .5) * UV_SQSIZ;
908 0 : ustep = uv_row[vi].nus - 1;
909 0 : if (vi == UV_NVS - 1 || vi == 0 || ustep <= 0)
910 0 : ustep = 1;
911 0 : for (ui = uv_row[vi].nus - 1; ui >= 0; ui -= ustep)
912 : {
913 0 : ua = uv_row[vi].ustart + (ui + .5) * UV_SQSIZ;
914 0 : ang = uv2ang(ua, va);
915 0 : i = (int)ang;
916 0 : epsa = fabs(ang - (i + .5));
917 0 : if (epsa < eps[i])
918 : {
919 0 : oog_table[i] = uv_row[vi].ncum + ui;
920 0 : eps[i] = epsa;
921 : }
922 : }
923 : }
924 0 : for (i = NANGLES; i--;) /* fill any holes */
925 0 : if (eps[i] > 1.5)
926 : {
927 : int i1, i2;
928 0 : for (i1 = 1; i1 < NANGLES / 2; i1++)
929 0 : if (eps[(i + i1) % NANGLES] < 1.5)
930 0 : break;
931 0 : for (i2 = 1; i2 < NANGLES / 2; i2++)
932 0 : if (eps[(i + NANGLES - i2) % NANGLES] < 1.5)
933 0 : break;
934 0 : if (i1 < i2)
935 0 : oog_table[i] = oog_table[(i + i1) % NANGLES];
936 : else
937 0 : oog_table[i] = oog_table[(i + NANGLES - i2) % NANGLES];
938 : }
939 0 : initialized = 1;
940 : }
941 0 : i = (int)uv2ang(u, v); /* look up hue angle */
942 0 : return (oog_table[i]);
943 : }
944 :
945 : #undef uv2ang
946 : #undef NANGLES
947 :
948 : #if !LOGLUV_PUBLIC
949 : static
950 : #endif
951 : int
952 0 : uv_encode(double u, double v, int em) /* encode (u',v') coordinates */
953 : {
954 : register int vi, ui;
955 :
956 : /* check for NaN */
957 0 : if (u != u || v != v)
958 : {
959 0 : u = U_NEU;
960 0 : v = V_NEU;
961 : }
962 :
963 0 : if (v < UV_VSTART)
964 0 : return oog_encode(u, v);
965 0 : vi = tiff_itrunc((v - UV_VSTART) * (1. / UV_SQSIZ), em);
966 0 : if (vi >= UV_NVS)
967 0 : return oog_encode(u, v);
968 0 : if (u < uv_row[vi].ustart)
969 0 : return oog_encode(u, v);
970 0 : ui = tiff_itrunc((u - uv_row[vi].ustart) * (1. / UV_SQSIZ), em);
971 0 : if (ui >= uv_row[vi].nus)
972 0 : return oog_encode(u, v);
973 :
974 0 : return (uv_row[vi].ncum + ui);
975 : }
976 :
977 : #if !LOGLUV_PUBLIC
978 : static
979 : #endif
980 : int
981 0 : uv_decode(double *up, double *vp, int c) /* decode (u',v') index */
982 : {
983 : int upper, lower;
984 : register int ui, vi;
985 :
986 0 : if (c < 0 || c >= UV_NDIVS)
987 0 : return (-1);
988 0 : lower = 0; /* binary search */
989 0 : upper = UV_NVS;
990 0 : while (upper - lower > 1)
991 : {
992 0 : vi = (lower + upper) >> 1;
993 0 : ui = c - uv_row[vi].ncum;
994 0 : if (ui > 0)
995 0 : lower = vi;
996 0 : else if (ui < 0)
997 0 : upper = vi;
998 : else
999 : {
1000 0 : lower = vi;
1001 0 : break;
1002 : }
1003 : }
1004 0 : vi = lower;
1005 0 : ui = c - uv_row[vi].ncum;
1006 0 : *up = uv_row[vi].ustart + (ui + .5) * UV_SQSIZ;
1007 0 : *vp = UV_VSTART + (vi + .5) * UV_SQSIZ;
1008 0 : return (0);
1009 : }
1010 :
1011 : #if !LOGLUV_PUBLIC
1012 : static
1013 : #endif
1014 : void
1015 0 : LogLuv24toXYZ(uint32_t p, float *XYZ)
1016 : {
1017 : int Ce;
1018 : double L, u, v, s, x, y;
1019 : /* decode luminance */
1020 0 : L = LogL10toY(p >> 14 & 0x3ff);
1021 0 : if (L <= 0.)
1022 : {
1023 0 : XYZ[0] = XYZ[1] = XYZ[2] = 0.;
1024 0 : return;
1025 : }
1026 : /* decode color */
1027 0 : Ce = p & 0x3fff;
1028 0 : if (uv_decode(&u, &v, Ce) < 0)
1029 : {
1030 0 : u = U_NEU;
1031 0 : v = V_NEU;
1032 : }
1033 0 : s = 1. / (6. * u - 16. * v + 12.);
1034 0 : x = 9. * u * s;
1035 0 : y = 4. * v * s;
1036 : /* convert to XYZ */
1037 0 : XYZ[0] = (float)(x / y * L);
1038 0 : XYZ[1] = (float)L;
1039 0 : XYZ[2] = (float)((1. - x - y) / y * L);
1040 : }
1041 :
1042 : #if !LOGLUV_PUBLIC
1043 : static
1044 : #endif
1045 : uint32_t
1046 0 : LogLuv24fromXYZ(float *XYZ, int em)
1047 : {
1048 : int Le, Ce;
1049 : double u, v, s;
1050 : /* encode luminance */
1051 0 : Le = LogL10fromY(XYZ[1], em);
1052 : /* encode color */
1053 0 : s = XYZ[0] + 15. * XYZ[1] + 3. * XYZ[2];
1054 0 : if (!Le || s <= 0.)
1055 : {
1056 0 : u = U_NEU;
1057 0 : v = V_NEU;
1058 : }
1059 : else
1060 : {
1061 0 : u = 4. * XYZ[0] / s;
1062 0 : v = 9. * XYZ[1] / s;
1063 : }
1064 0 : Ce = uv_encode(u, v, em);
1065 0 : if (Ce < 0) /* never happens */
1066 0 : Ce = uv_encode(U_NEU, V_NEU, SGILOGENCODE_NODITHER);
1067 : /* combine encodings */
1068 0 : return (Le << 14 | Ce);
1069 : }
1070 :
1071 0 : static void Luv24toXYZ(LogLuvState *sp, uint8_t *op, tmsize_t n)
1072 : {
1073 0 : uint32_t *luv = (uint32_t *)sp->tbuf;
1074 0 : float *xyz = (float *)op;
1075 :
1076 0 : while (n-- > 0)
1077 : {
1078 0 : LogLuv24toXYZ(*luv, xyz);
1079 0 : xyz += 3;
1080 0 : luv++;
1081 : }
1082 0 : }
1083 :
1084 0 : static void Luv24toLuv48(LogLuvState *sp, uint8_t *op, tmsize_t n)
1085 : {
1086 0 : uint32_t *luv = (uint32_t *)sp->tbuf;
1087 0 : int16_t *luv3 = (int16_t *)op;
1088 :
1089 0 : while (n-- > 0)
1090 : {
1091 : double u, v;
1092 :
1093 0 : *luv3++ = (int16_t)((*luv >> 12 & 0xffd) + 13314);
1094 0 : if (uv_decode(&u, &v, *luv & 0x3fff) < 0)
1095 : {
1096 0 : u = U_NEU;
1097 0 : v = V_NEU;
1098 : }
1099 0 : *luv3++ = (int16_t)(u * (1L << 15));
1100 0 : *luv3++ = (int16_t)(v * (1L << 15));
1101 0 : luv++;
1102 : }
1103 0 : }
1104 :
1105 0 : static void Luv24toRGB(LogLuvState *sp, uint8_t *op, tmsize_t n)
1106 : {
1107 0 : uint32_t *luv = (uint32_t *)sp->tbuf;
1108 0 : uint8_t *rgb = (uint8_t *)op;
1109 :
1110 0 : while (n-- > 0)
1111 : {
1112 : float xyz[3];
1113 :
1114 0 : LogLuv24toXYZ(*luv++, xyz);
1115 0 : XYZtoRGB24(xyz, rgb);
1116 0 : rgb += 3;
1117 : }
1118 0 : }
1119 :
1120 0 : static void Luv24fromXYZ(LogLuvState *sp, uint8_t *op, tmsize_t n)
1121 : {
1122 0 : uint32_t *luv = (uint32_t *)sp->tbuf;
1123 0 : float *xyz = (float *)op;
1124 :
1125 0 : while (n-- > 0)
1126 : {
1127 0 : *luv++ = LogLuv24fromXYZ(xyz, sp->encode_meth);
1128 0 : xyz += 3;
1129 : }
1130 0 : }
1131 :
1132 0 : static void Luv24fromLuv48(LogLuvState *sp, uint8_t *op, tmsize_t n)
1133 : {
1134 0 : uint32_t *luv = (uint32_t *)sp->tbuf;
1135 0 : int16_t *luv3 = (int16_t *)op;
1136 :
1137 0 : while (n-- > 0)
1138 : {
1139 : int Le, Ce;
1140 :
1141 0 : if (luv3[0] <= 0)
1142 0 : Le = 0;
1143 0 : else if (luv3[0] >= (1 << 12) + 3314)
1144 0 : Le = (1 << 10) - 1;
1145 0 : else if (sp->encode_meth == SGILOGENCODE_NODITHER)
1146 0 : Le = (luv3[0] - 3314) >> 2;
1147 : else
1148 0 : Le = tiff_itrunc(.25 * (luv3[0] - 3314.), sp->encode_meth);
1149 :
1150 0 : Ce = uv_encode((luv3[1] + .5) / (1 << 15), (luv3[2] + .5) / (1 << 15),
1151 : sp->encode_meth);
1152 0 : if (Ce < 0) /* never happens */
1153 0 : Ce = uv_encode(U_NEU, V_NEU, SGILOGENCODE_NODITHER);
1154 0 : *luv++ = (uint32_t)Le << 14 | Ce;
1155 0 : luv3 += 3;
1156 : }
1157 0 : }
1158 :
1159 : #if !LOGLUV_PUBLIC
1160 : static
1161 : #endif
1162 : void
1163 0 : LogLuv32toXYZ(uint32_t p, float *XYZ)
1164 : {
1165 : double L, u, v, s, x, y;
1166 : /* decode luminance */
1167 0 : L = LogL16toY((int)p >> 16);
1168 0 : if (L <= 0.)
1169 : {
1170 0 : XYZ[0] = XYZ[1] = XYZ[2] = 0.;
1171 0 : return;
1172 : }
1173 : /* decode color */
1174 0 : u = 1. / UVSCALE * ((p >> 8 & 0xff) + .5);
1175 0 : v = 1. / UVSCALE * ((p & 0xff) + .5);
1176 0 : s = 1. / (6. * u - 16. * v + 12.);
1177 0 : x = 9. * u * s;
1178 0 : y = 4. * v * s;
1179 : /* convert to XYZ */
1180 0 : XYZ[0] = (float)(x / y * L);
1181 0 : XYZ[1] = (float)L;
1182 0 : XYZ[2] = (float)((1. - x - y) / y * L);
1183 : }
1184 :
1185 : #if !LOGLUV_PUBLIC
1186 : static
1187 : #endif
1188 : uint32_t
1189 0 : LogLuv32fromXYZ(float *XYZ, int em)
1190 : {
1191 : unsigned int Le, ue, ve;
1192 : double u, v, s;
1193 : /* encode luminance */
1194 0 : Le = (unsigned int)LogL16fromY(XYZ[1], em);
1195 : /* encode color */
1196 0 : s = XYZ[0] + 15. * XYZ[1] + 3. * XYZ[2];
1197 0 : if (!Le || s <= 0.)
1198 : {
1199 0 : u = U_NEU;
1200 0 : v = V_NEU;
1201 : }
1202 : else
1203 : {
1204 0 : u = 4. * XYZ[0] / s;
1205 0 : v = 9. * XYZ[1] / s;
1206 : }
1207 0 : if (u <= 0.)
1208 0 : ue = 0;
1209 : else
1210 0 : ue = tiff_itrunc(UVSCALE * u, em);
1211 0 : if (ue > 255)
1212 0 : ue = 255;
1213 0 : if (v <= 0.)
1214 0 : ve = 0;
1215 : else
1216 0 : ve = tiff_itrunc(UVSCALE * v, em);
1217 0 : if (ve > 255)
1218 0 : ve = 255;
1219 : /* combine encodings */
1220 0 : return (Le << 16 | ue << 8 | ve);
1221 : }
1222 :
1223 0 : static void Luv32toXYZ(LogLuvState *sp, uint8_t *op, tmsize_t n)
1224 : {
1225 0 : uint32_t *luv = (uint32_t *)sp->tbuf;
1226 0 : float *xyz = (float *)op;
1227 :
1228 0 : while (n-- > 0)
1229 : {
1230 0 : LogLuv32toXYZ(*luv++, xyz);
1231 0 : xyz += 3;
1232 : }
1233 0 : }
1234 :
1235 0 : static void Luv32toLuv48(LogLuvState *sp, uint8_t *op, tmsize_t n)
1236 : {
1237 0 : uint32_t *luv = (uint32_t *)sp->tbuf;
1238 0 : int16_t *luv3 = (int16_t *)op;
1239 :
1240 0 : while (n-- > 0)
1241 : {
1242 : double u, v;
1243 :
1244 0 : *luv3++ = (int16_t)(*luv >> 16);
1245 0 : u = 1. / UVSCALE * ((*luv >> 8 & 0xff) + .5);
1246 0 : v = 1. / UVSCALE * ((*luv & 0xff) + .5);
1247 0 : *luv3++ = (int16_t)(u * (1L << 15));
1248 0 : *luv3++ = (int16_t)(v * (1L << 15));
1249 0 : luv++;
1250 : }
1251 0 : }
1252 :
1253 0 : static void Luv32toRGB(LogLuvState *sp, uint8_t *op, tmsize_t n)
1254 : {
1255 0 : uint32_t *luv = (uint32_t *)sp->tbuf;
1256 0 : uint8_t *rgb = (uint8_t *)op;
1257 :
1258 0 : while (n-- > 0)
1259 : {
1260 : float xyz[3];
1261 :
1262 0 : LogLuv32toXYZ(*luv++, xyz);
1263 0 : XYZtoRGB24(xyz, rgb);
1264 0 : rgb += 3;
1265 : }
1266 0 : }
1267 :
1268 0 : static void Luv32fromXYZ(LogLuvState *sp, uint8_t *op, tmsize_t n)
1269 : {
1270 0 : uint32_t *luv = (uint32_t *)sp->tbuf;
1271 0 : float *xyz = (float *)op;
1272 :
1273 0 : while (n-- > 0)
1274 : {
1275 0 : *luv++ = LogLuv32fromXYZ(xyz, sp->encode_meth);
1276 0 : xyz += 3;
1277 : }
1278 0 : }
1279 :
1280 0 : static void Luv32fromLuv48(LogLuvState *sp, uint8_t *op, tmsize_t n)
1281 : {
1282 0 : uint32_t *luv = (uint32_t *)sp->tbuf;
1283 0 : int16_t *luv3 = (int16_t *)op;
1284 :
1285 0 : if (sp->encode_meth == SGILOGENCODE_NODITHER)
1286 : {
1287 0 : while (n-- > 0)
1288 : {
1289 0 : *luv++ = (uint32_t)luv3[0] << 16 |
1290 0 : (luv3[1] * (uint32_t)(UVSCALE + .5) >> 7 & 0xff00) |
1291 0 : (luv3[2] * (uint32_t)(UVSCALE + .5) >> 15 & 0xff);
1292 0 : luv3 += 3;
1293 : }
1294 0 : return;
1295 : }
1296 0 : while (n-- > 0)
1297 : {
1298 0 : *luv++ =
1299 0 : (uint32_t)luv3[0] << 16 |
1300 0 : (tiff_itrunc(luv3[1] * (UVSCALE / (1 << 15)), sp->encode_meth)
1301 0 : << 8 &
1302 0 : 0xff00) |
1303 0 : (tiff_itrunc(luv3[2] * (UVSCALE / (1 << 15)), sp->encode_meth) &
1304 : 0xff);
1305 0 : luv3 += 3;
1306 : }
1307 : }
1308 :
1309 20 : static void _logLuvNop(LogLuvState *sp, uint8_t *op, tmsize_t n)
1310 : {
1311 : (void)sp;
1312 : (void)op;
1313 : (void)n;
1314 20 : }
1315 :
1316 1 : static int LogL16GuessDataFmt(TIFFDirectory *td)
1317 : {
1318 : #define PACK(s, b, f) (((b) << 6) | ((s) << 3) | (f))
1319 1 : switch (
1320 1 : PACK(td->td_samplesperpixel, td->td_bitspersample, td->td_sampleformat))
1321 : {
1322 0 : case PACK(1, 32, SAMPLEFORMAT_IEEEFP):
1323 0 : return (SGILOGDATAFMT_FLOAT);
1324 1 : case PACK(1, 16, SAMPLEFORMAT_VOID):
1325 : case PACK(1, 16, SAMPLEFORMAT_INT):
1326 : case PACK(1, 16, SAMPLEFORMAT_UINT):
1327 1 : return (SGILOGDATAFMT_16BIT);
1328 0 : case PACK(1, 8, SAMPLEFORMAT_VOID):
1329 : case PACK(1, 8, SAMPLEFORMAT_UINT):
1330 0 : return (SGILOGDATAFMT_8BIT);
1331 : }
1332 : #undef PACK
1333 0 : return (SGILOGDATAFMT_UNKNOWN);
1334 : }
1335 :
1336 4 : static tmsize_t multiply_ms(tmsize_t m1, tmsize_t m2)
1337 : {
1338 4 : return _TIFFMultiplySSize(NULL, m1, m2, NULL);
1339 : }
1340 :
1341 2 : static int LogL16InitState(TIFF *tif)
1342 : {
1343 : static const char module[] = "LogL16InitState";
1344 2 : TIFFDirectory *td = &tif->tif_dir;
1345 2 : LogLuvState *sp = DecoderState(tif);
1346 :
1347 2 : assert(sp != NULL);
1348 2 : assert(td->td_photometric == PHOTOMETRIC_LOGL);
1349 :
1350 2 : if (td->td_samplesperpixel != 1)
1351 : {
1352 0 : TIFFErrorExtR(tif, module,
1353 : "Sorry, can not handle LogL image with %s=%" PRIu16,
1354 0 : "Samples/pixel", td->td_samplesperpixel);
1355 0 : return 0;
1356 : }
1357 :
1358 : /* for some reason, we can't do this in TIFFInitLogL16 */
1359 2 : if (sp->user_datafmt == SGILOGDATAFMT_UNKNOWN)
1360 1 : sp->user_datafmt = LogL16GuessDataFmt(td);
1361 2 : switch (sp->user_datafmt)
1362 : {
1363 0 : case SGILOGDATAFMT_FLOAT:
1364 0 : sp->pixel_size = sizeof(float);
1365 0 : break;
1366 1 : case SGILOGDATAFMT_16BIT:
1367 1 : sp->pixel_size = sizeof(int16_t);
1368 1 : break;
1369 1 : case SGILOGDATAFMT_8BIT:
1370 1 : sp->pixel_size = sizeof(uint8_t);
1371 1 : break;
1372 0 : default:
1373 0 : TIFFErrorExtR(tif, module,
1374 : "No support for converting user data format to LogL");
1375 0 : return (0);
1376 : }
1377 2 : if (isTiled(tif))
1378 0 : sp->tbuflen = multiply_ms(td->td_tilewidth, td->td_tilelength);
1379 2 : else if (td->td_rowsperstrip < td->td_imagelength)
1380 0 : sp->tbuflen = multiply_ms(td->td_imagewidth, td->td_rowsperstrip);
1381 : else
1382 2 : sp->tbuflen = multiply_ms(td->td_imagewidth, td->td_imagelength);
1383 2 : if (multiply_ms(sp->tbuflen, sizeof(int16_t)) == 0 ||
1384 2 : (sp->tbuf = (uint8_t *)_TIFFmallocExt(
1385 2 : tif, sp->tbuflen * sizeof(int16_t))) == NULL)
1386 : {
1387 0 : TIFFErrorExtR(tif, module, "No space for SGILog translation buffer");
1388 0 : return (0);
1389 : }
1390 2 : return (1);
1391 : }
1392 :
1393 0 : static int LogLuvGuessDataFmt(TIFFDirectory *td)
1394 : {
1395 : int guess;
1396 :
1397 : /*
1398 : * If the user didn't tell us their datafmt,
1399 : * take our best guess from the bitspersample.
1400 : */
1401 : #define PACK(a, b) (((a) << 3) | (b))
1402 0 : switch (PACK(td->td_bitspersample, td->td_sampleformat))
1403 : {
1404 0 : case PACK(32, SAMPLEFORMAT_IEEEFP):
1405 0 : guess = SGILOGDATAFMT_FLOAT;
1406 0 : break;
1407 0 : case PACK(32, SAMPLEFORMAT_VOID):
1408 : case PACK(32, SAMPLEFORMAT_UINT):
1409 : case PACK(32, SAMPLEFORMAT_INT):
1410 0 : guess = SGILOGDATAFMT_RAW;
1411 0 : break;
1412 0 : case PACK(16, SAMPLEFORMAT_VOID):
1413 : case PACK(16, SAMPLEFORMAT_INT):
1414 : case PACK(16, SAMPLEFORMAT_UINT):
1415 0 : guess = SGILOGDATAFMT_16BIT;
1416 0 : break;
1417 0 : case PACK(8, SAMPLEFORMAT_VOID):
1418 : case PACK(8, SAMPLEFORMAT_UINT):
1419 0 : guess = SGILOGDATAFMT_8BIT;
1420 0 : break;
1421 0 : default:
1422 0 : guess = SGILOGDATAFMT_UNKNOWN;
1423 0 : break;
1424 : #undef PACK
1425 : }
1426 : /*
1427 : * Double-check samples per pixel.
1428 : */
1429 0 : switch (td->td_samplesperpixel)
1430 : {
1431 0 : case 1:
1432 0 : if (guess != SGILOGDATAFMT_RAW)
1433 0 : guess = SGILOGDATAFMT_UNKNOWN;
1434 0 : break;
1435 0 : case 3:
1436 0 : if (guess == SGILOGDATAFMT_RAW)
1437 0 : guess = SGILOGDATAFMT_UNKNOWN;
1438 0 : break;
1439 0 : default:
1440 0 : guess = SGILOGDATAFMT_UNKNOWN;
1441 0 : break;
1442 : }
1443 0 : return (guess);
1444 : }
1445 :
1446 0 : static int LogLuvInitState(TIFF *tif)
1447 : {
1448 : static const char module[] = "LogLuvInitState";
1449 0 : TIFFDirectory *td = &tif->tif_dir;
1450 0 : LogLuvState *sp = DecoderState(tif);
1451 :
1452 0 : assert(sp != NULL);
1453 0 : assert(td->td_photometric == PHOTOMETRIC_LOGLUV);
1454 :
1455 : /* for some reason, we can't do this in TIFFInitLogLuv */
1456 0 : if (td->td_planarconfig != PLANARCONFIG_CONTIG)
1457 : {
1458 0 : TIFFErrorExtR(tif, module,
1459 : "SGILog compression cannot handle non-contiguous data");
1460 0 : return (0);
1461 : }
1462 0 : if (sp->user_datafmt == SGILOGDATAFMT_UNKNOWN)
1463 0 : sp->user_datafmt = LogLuvGuessDataFmt(td);
1464 0 : switch (sp->user_datafmt)
1465 : {
1466 0 : case SGILOGDATAFMT_FLOAT:
1467 0 : sp->pixel_size = 3 * sizeof(float);
1468 0 : break;
1469 0 : case SGILOGDATAFMT_16BIT:
1470 0 : sp->pixel_size = 3 * sizeof(int16_t);
1471 0 : break;
1472 0 : case SGILOGDATAFMT_RAW:
1473 0 : sp->pixel_size = sizeof(uint32_t);
1474 0 : break;
1475 0 : case SGILOGDATAFMT_8BIT:
1476 0 : sp->pixel_size = 3 * sizeof(uint8_t);
1477 0 : break;
1478 0 : default:
1479 0 : TIFFErrorExtR(
1480 : tif, module,
1481 : "No support for converting user data format to LogLuv");
1482 0 : return (0);
1483 : }
1484 0 : if (isTiled(tif))
1485 0 : sp->tbuflen = multiply_ms(td->td_tilewidth, td->td_tilelength);
1486 0 : else if (td->td_rowsperstrip < td->td_imagelength)
1487 0 : sp->tbuflen = multiply_ms(td->td_imagewidth, td->td_rowsperstrip);
1488 : else
1489 0 : sp->tbuflen = multiply_ms(td->td_imagewidth, td->td_imagelength);
1490 0 : if (multiply_ms(sp->tbuflen, sizeof(uint32_t)) == 0 ||
1491 0 : (sp->tbuf = (uint8_t *)_TIFFmallocExt(
1492 0 : tif, sp->tbuflen * sizeof(uint32_t))) == NULL)
1493 : {
1494 0 : TIFFErrorExtR(tif, module, "No space for SGILog translation buffer");
1495 0 : return (0);
1496 : }
1497 0 : return (1);
1498 : }
1499 :
1500 3 : static int LogLuvFixupTags(TIFF *tif)
1501 : {
1502 : (void)tif;
1503 3 : return (1);
1504 : }
1505 :
1506 2 : static int LogLuvSetupDecode(TIFF *tif)
1507 : {
1508 : static const char module[] = "LogLuvSetupDecode";
1509 2 : LogLuvState *sp = DecoderState(tif);
1510 2 : TIFFDirectory *td = &tif->tif_dir;
1511 :
1512 2 : tif->tif_postdecode = _TIFFNoPostDecode;
1513 2 : switch (td->td_photometric)
1514 : {
1515 0 : case PHOTOMETRIC_LOGLUV:
1516 0 : if (!LogLuvInitState(tif))
1517 0 : break;
1518 0 : if (td->td_compression == COMPRESSION_SGILOG24)
1519 : {
1520 0 : tif->tif_decoderow = LogLuvDecode24;
1521 0 : switch (sp->user_datafmt)
1522 : {
1523 0 : case SGILOGDATAFMT_FLOAT:
1524 0 : sp->tfunc = Luv24toXYZ;
1525 0 : break;
1526 0 : case SGILOGDATAFMT_16BIT:
1527 0 : sp->tfunc = Luv24toLuv48;
1528 0 : break;
1529 0 : case SGILOGDATAFMT_8BIT:
1530 0 : sp->tfunc = Luv24toRGB;
1531 0 : break;
1532 : }
1533 0 : }
1534 : else
1535 : {
1536 0 : tif->tif_decoderow = LogLuvDecode32;
1537 0 : switch (sp->user_datafmt)
1538 : {
1539 0 : case SGILOGDATAFMT_FLOAT:
1540 0 : sp->tfunc = Luv32toXYZ;
1541 0 : break;
1542 0 : case SGILOGDATAFMT_16BIT:
1543 0 : sp->tfunc = Luv32toLuv48;
1544 0 : break;
1545 0 : case SGILOGDATAFMT_8BIT:
1546 0 : sp->tfunc = Luv32toRGB;
1547 0 : break;
1548 : }
1549 0 : }
1550 0 : return (1);
1551 2 : case PHOTOMETRIC_LOGL:
1552 2 : if (!LogL16InitState(tif))
1553 0 : break;
1554 2 : tif->tif_decoderow = LogL16Decode;
1555 2 : switch (sp->user_datafmt)
1556 : {
1557 0 : case SGILOGDATAFMT_FLOAT:
1558 0 : sp->tfunc = L16toY;
1559 0 : break;
1560 1 : case SGILOGDATAFMT_8BIT:
1561 1 : sp->tfunc = L16toGry;
1562 1 : break;
1563 : }
1564 2 : return (1);
1565 0 : default:
1566 0 : TIFFErrorExtR(tif, module,
1567 : "Inappropriate photometric interpretation %" PRIu16
1568 : " for SGILog compression; %s",
1569 0 : td->td_photometric, "must be either LogLUV or LogL");
1570 0 : break;
1571 : }
1572 0 : return (0);
1573 : }
1574 :
1575 0 : static int LogLuvSetupEncode(TIFF *tif)
1576 : {
1577 : static const char module[] = "LogLuvSetupEncode";
1578 0 : LogLuvState *sp = EncoderState(tif);
1579 0 : TIFFDirectory *td = &tif->tif_dir;
1580 :
1581 0 : switch (td->td_photometric)
1582 : {
1583 0 : case PHOTOMETRIC_LOGLUV:
1584 0 : if (!LogLuvInitState(tif))
1585 0 : return (0);
1586 0 : if (td->td_compression == COMPRESSION_SGILOG24)
1587 : {
1588 0 : tif->tif_encoderow = LogLuvEncode24;
1589 0 : switch (sp->user_datafmt)
1590 : {
1591 0 : case SGILOGDATAFMT_FLOAT:
1592 0 : sp->tfunc = Luv24fromXYZ;
1593 0 : break;
1594 0 : case SGILOGDATAFMT_16BIT:
1595 0 : sp->tfunc = Luv24fromLuv48;
1596 0 : break;
1597 0 : case SGILOGDATAFMT_RAW:
1598 0 : break;
1599 0 : default:
1600 0 : goto notsupported;
1601 : }
1602 : }
1603 : else
1604 : {
1605 0 : tif->tif_encoderow = LogLuvEncode32;
1606 0 : switch (sp->user_datafmt)
1607 : {
1608 0 : case SGILOGDATAFMT_FLOAT:
1609 0 : sp->tfunc = Luv32fromXYZ;
1610 0 : break;
1611 0 : case SGILOGDATAFMT_16BIT:
1612 0 : sp->tfunc = Luv32fromLuv48;
1613 0 : break;
1614 0 : case SGILOGDATAFMT_RAW:
1615 0 : break;
1616 0 : default:
1617 0 : goto notsupported;
1618 : }
1619 : }
1620 0 : break;
1621 0 : case PHOTOMETRIC_LOGL:
1622 0 : if (!LogL16InitState(tif))
1623 0 : return (0);
1624 0 : tif->tif_encoderow = LogL16Encode;
1625 0 : switch (sp->user_datafmt)
1626 : {
1627 0 : case SGILOGDATAFMT_FLOAT:
1628 0 : sp->tfunc = L16fromY;
1629 0 : break;
1630 0 : case SGILOGDATAFMT_16BIT:
1631 0 : break;
1632 0 : default:
1633 0 : goto notsupported;
1634 : }
1635 0 : break;
1636 0 : default:
1637 0 : TIFFErrorExtR(tif, module,
1638 : "Inappropriate photometric interpretation %" PRIu16
1639 : " for SGILog compression; %s",
1640 0 : td->td_photometric, "must be either LogLUV or LogL");
1641 0 : return (0);
1642 : }
1643 0 : sp->encoder_state = 1;
1644 0 : return (1);
1645 0 : notsupported:
1646 0 : TIFFErrorExtR(tif, module,
1647 : "SGILog compression supported only for %s, or raw data",
1648 0 : td->td_photometric == PHOTOMETRIC_LOGL ? "Y, L" : "XYZ, Luv");
1649 0 : return (0);
1650 : }
1651 :
1652 0 : static void LogLuvClose(TIFF *tif)
1653 : {
1654 0 : LogLuvState *sp = (LogLuvState *)tif->tif_data;
1655 0 : TIFFDirectory *td = &tif->tif_dir;
1656 :
1657 0 : assert(sp != 0);
1658 : /*
1659 : * For consistency, we always want to write out the same
1660 : * bitspersample and sampleformat for our TIFF file,
1661 : * regardless of the data format being used by the application.
1662 : * Since this routine is called after tags have been set but
1663 : * before they have been recorded in the file, we reset them here.
1664 : * Note: this is really a nasty approach. See PixarLogClose
1665 : */
1666 0 : if (sp->encoder_state)
1667 : {
1668 : /* See PixarLogClose. Might avoid issues with tags whose size depends
1669 : * on those below, but not completely sure this is enough. */
1670 0 : td->td_samplesperpixel =
1671 0 : (td->td_photometric == PHOTOMETRIC_LOGL) ? 1 : 3;
1672 0 : td->td_bitspersample = 16;
1673 0 : td->td_sampleformat = SAMPLEFORMAT_INT;
1674 : }
1675 0 : }
1676 :
1677 3 : static void LogLuvCleanup(TIFF *tif)
1678 : {
1679 3 : LogLuvState *sp = (LogLuvState *)tif->tif_data;
1680 :
1681 3 : assert(sp != 0);
1682 :
1683 3 : tif->tif_tagmethods.vgetfield = sp->vgetparent;
1684 3 : tif->tif_tagmethods.vsetfield = sp->vsetparent;
1685 :
1686 3 : if (sp->tbuf)
1687 2 : _TIFFfreeExt(tif, sp->tbuf);
1688 3 : _TIFFfreeExt(tif, sp);
1689 3 : tif->tif_data = NULL;
1690 :
1691 3 : _TIFFSetDefaultCompressionState(tif);
1692 3 : }
1693 :
1694 27 : static int LogLuvVSetField(TIFF *tif, uint32_t tag, va_list ap)
1695 : {
1696 : static const char module[] = "LogLuvVSetField";
1697 27 : LogLuvState *sp = DecoderState(tif);
1698 : int bps, fmt;
1699 :
1700 27 : switch (tag)
1701 : {
1702 1 : case TIFFTAG_SGILOGDATAFMT:
1703 1 : sp->user_datafmt = (int)va_arg(ap, int);
1704 : /*
1705 : * Tweak the TIFF header so that the rest of libtiff knows what
1706 : * size of data will be passed between app and library, and
1707 : * assume that the app knows what it is doing and is not
1708 : * confused by these header manipulations...
1709 : */
1710 1 : switch (sp->user_datafmt)
1711 : {
1712 0 : case SGILOGDATAFMT_FLOAT:
1713 0 : bps = 32;
1714 0 : fmt = SAMPLEFORMAT_IEEEFP;
1715 0 : break;
1716 0 : case SGILOGDATAFMT_16BIT:
1717 0 : bps = 16;
1718 0 : fmt = SAMPLEFORMAT_INT;
1719 0 : break;
1720 0 : case SGILOGDATAFMT_RAW:
1721 0 : bps = 32;
1722 0 : fmt = SAMPLEFORMAT_UINT;
1723 0 : TIFFSetField(tif, TIFFTAG_SAMPLESPERPIXEL, 1);
1724 0 : break;
1725 1 : case SGILOGDATAFMT_8BIT:
1726 1 : bps = 8;
1727 1 : fmt = SAMPLEFORMAT_UINT;
1728 1 : break;
1729 0 : default:
1730 0 : TIFFErrorExtR(
1731 0 : tif, tif->tif_name,
1732 : "Unknown data format %d for LogLuv compression",
1733 : sp->user_datafmt);
1734 0 : return (0);
1735 : }
1736 1 : TIFFSetField(tif, TIFFTAG_BITSPERSAMPLE, bps);
1737 1 : TIFFSetField(tif, TIFFTAG_SAMPLEFORMAT, fmt);
1738 : /*
1739 : * Must recalculate sizes should bits/sample change.
1740 : */
1741 1 : tif->tif_tilesize = isTiled(tif) ? TIFFTileSize(tif) : (tmsize_t)-1;
1742 1 : tif->tif_scanlinesize = TIFFScanlineSize(tif);
1743 1 : return (1);
1744 0 : case TIFFTAG_SGILOGENCODE:
1745 0 : sp->encode_meth = (int)va_arg(ap, int);
1746 0 : if (sp->encode_meth != SGILOGENCODE_NODITHER &&
1747 0 : sp->encode_meth != SGILOGENCODE_RANDITHER)
1748 : {
1749 0 : TIFFErrorExtR(tif, module,
1750 : "Unknown encoding %d for LogLuv compression",
1751 : sp->encode_meth);
1752 0 : return (0);
1753 : }
1754 0 : return (1);
1755 26 : default:
1756 26 : return (*sp->vsetparent)(tif, tag, ap);
1757 : }
1758 : }
1759 :
1760 50 : static int LogLuvVGetField(TIFF *tif, uint32_t tag, va_list ap)
1761 : {
1762 50 : LogLuvState *sp = (LogLuvState *)tif->tif_data;
1763 :
1764 50 : switch (tag)
1765 : {
1766 0 : case TIFFTAG_SGILOGDATAFMT:
1767 0 : *va_arg(ap, int *) = sp->user_datafmt;
1768 0 : return (1);
1769 50 : default:
1770 50 : return (*sp->vgetparent)(tif, tag, ap);
1771 : }
1772 : }
1773 :
1774 : static const TIFFField LogLuvFields[] = {
1775 : {TIFFTAG_SGILOGDATAFMT, 0, 0, TIFF_SHORT, 0, TIFF_SETGET_INT,
1776 : TIFF_SETGET_UNDEFINED, FIELD_PSEUDO, TRUE, FALSE, "SGILogDataFmt", NULL},
1777 : {TIFFTAG_SGILOGENCODE, 0, 0, TIFF_SHORT, 0, TIFF_SETGET_INT,
1778 : TIFF_SETGET_UNDEFINED, FIELD_PSEUDO, TRUE, FALSE, "SGILogEncode", NULL}};
1779 :
1780 3 : int TIFFInitSGILog(TIFF *tif, int scheme)
1781 : {
1782 : static const char module[] = "TIFFInitSGILog";
1783 : LogLuvState *sp;
1784 :
1785 3 : assert(scheme == COMPRESSION_SGILOG24 || scheme == COMPRESSION_SGILOG);
1786 :
1787 : /*
1788 : * Merge codec-specific tag information.
1789 : */
1790 3 : if (!_TIFFMergeFields(tif, LogLuvFields, TIFFArrayCount(LogLuvFields)))
1791 : {
1792 0 : TIFFErrorExtR(tif, module, "Merging SGILog codec-specific tags failed");
1793 0 : return 0;
1794 : }
1795 :
1796 : /*
1797 : * Allocate state block so tag methods have storage to record values.
1798 : */
1799 3 : tif->tif_data = (uint8_t *)_TIFFmallocExt(tif, sizeof(LogLuvState));
1800 3 : if (tif->tif_data == NULL)
1801 0 : goto bad;
1802 3 : sp = (LogLuvState *)tif->tif_data;
1803 3 : _TIFFmemset((void *)sp, 0, sizeof(*sp));
1804 3 : sp->user_datafmt = SGILOGDATAFMT_UNKNOWN;
1805 3 : sp->encode_meth = (scheme == COMPRESSION_SGILOG24) ? SGILOGENCODE_RANDITHER
1806 3 : : SGILOGENCODE_NODITHER;
1807 3 : sp->tfunc = _logLuvNop;
1808 :
1809 : /*
1810 : * Install codec methods.
1811 : * NB: tif_decoderow & tif_encoderow are filled
1812 : * in at setup time.
1813 : */
1814 3 : tif->tif_fixuptags = LogLuvFixupTags;
1815 3 : tif->tif_setupdecode = LogLuvSetupDecode;
1816 3 : tif->tif_decodestrip = LogLuvDecodeStrip;
1817 3 : tif->tif_decodetile = LogLuvDecodeTile;
1818 3 : tif->tif_setupencode = LogLuvSetupEncode;
1819 3 : tif->tif_encodestrip = LogLuvEncodeStrip;
1820 3 : tif->tif_encodetile = LogLuvEncodeTile;
1821 3 : tif->tif_close = LogLuvClose;
1822 3 : tif->tif_cleanup = LogLuvCleanup;
1823 :
1824 : /*
1825 : * Override parent get/set field methods.
1826 : */
1827 3 : sp->vgetparent = tif->tif_tagmethods.vgetfield;
1828 3 : tif->tif_tagmethods.vgetfield = LogLuvVGetField; /* hook for codec tags */
1829 3 : sp->vsetparent = tif->tif_tagmethods.vsetfield;
1830 3 : tif->tif_tagmethods.vsetfield = LogLuvVSetField; /* hook for codec tags */
1831 :
1832 3 : return (1);
1833 0 : bad:
1834 0 : TIFFErrorExtR(tif, module, "%s: No space for LogLuv state block",
1835 : tif->tif_name);
1836 0 : return (0);
1837 : }
1838 : #endif /* LOGLUV_SUPPORT */
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