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 <limits.h>
149 : #include <math.h>
150 : #include <stdio.h>
151 : #include <stdlib.h>
152 : #include <time.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 : {
162 : int encoder_state; /* 1 if encoder correctly initialized */
163 : int user_datafmt; /* user data format */
164 : int encode_meth; /* encoding method */
165 : int pixel_size; /* bytes per pixel */
166 :
167 : uint8_t *tbuf; /* translation buffer */
168 : tmsize_t tbuflen; /* buffer length */
169 : void (*tfunc)(LogLuvState *, uint8_t *, tmsize_t);
170 :
171 : TIFFVSetMethod vgetparent; /* super-class method */
172 : TIFFVSetMethod vsetparent; /* super-class method */
173 : };
174 :
175 : #define DecoderState(tif) ((LogLuvState *)(tif)->tif_data)
176 : #define EncoderState(tif) ((LogLuvState *)(tif)->tif_data)
177 :
178 : #define SGILOGDATAFMT_UNKNOWN -1
179 :
180 : #define MINRUN 4 /* minimum run length */
181 :
182 : /*
183 : * Decode a string of 16-bit gray pixels.
184 : */
185 40 : static int LogL16Decode(TIFF *tif, uint8_t *op, tmsize_t occ, uint16_t s)
186 : {
187 : static const char module[] = "LogL16Decode";
188 40 : LogLuvState *sp = DecoderState(tif);
189 : int shft;
190 : tmsize_t i;
191 : tmsize_t npixels;
192 : unsigned char *bp;
193 : int16_t *tp;
194 : int16_t b;
195 : tmsize_t cc;
196 : int rc;
197 :
198 : (void)s;
199 40 : assert(s == 0);
200 40 : assert(sp != NULL);
201 :
202 40 : npixels = occ / sp->pixel_size;
203 :
204 40 : if (sp->user_datafmt == SGILOGDATAFMT_16BIT)
205 20 : tp = (int16_t *)op;
206 : else
207 : {
208 20 : if (sp->tbuflen < npixels)
209 : {
210 0 : TIFFErrorExtR(tif, module, "Translation buffer too short");
211 0 : return (0);
212 : }
213 20 : tp = (int16_t *)sp->tbuf;
214 : }
215 40 : _TIFFmemset((void *)tp, 0, (tmsize_t)((size_t)npixels * sizeof(tp[0])));
216 :
217 40 : bp = (unsigned char *)tif->tif_rawcp;
218 40 : cc = tif->tif_rawcc;
219 : /* get each byte string */
220 120 : for (shft = 8; shft >= 0; shft -= 8)
221 : {
222 168 : for (i = 0; i < npixels && cc > 0;)
223 : {
224 88 : if (*bp >= 128)
225 : { /* run */
226 44 : if (cc < 2)
227 0 : break;
228 44 : rc = *bp++ + (2 - 128);
229 44 : b = (int16_t)(*bp++ << shft);
230 44 : cc -= 2;
231 862 : while (rc-- && i < npixels)
232 818 : tp[i++] |= b;
233 : }
234 : else
235 : { /* non-run */
236 44 : rc = *bp++; /* nul is noop */
237 826 : while (--cc && rc-- && i < npixels)
238 782 : tp[i++] |= (int16_t)(*bp++ << shft);
239 : }
240 : }
241 80 : if (i != npixels)
242 : {
243 0 : TIFFErrorExtR(tif, module,
244 : "Not enough data at row %" PRIu32
245 : " (short %" TIFF_SSIZE_FORMAT " pixels)",
246 : tif->tif_dir.td_row, npixels - i);
247 0 : tif->tif_rawcp = (uint8_t *)bp;
248 0 : tif->tif_rawcc = cc;
249 0 : return (0);
250 : }
251 : }
252 40 : (*sp->tfunc)(sp, op, npixels);
253 40 : tif->tif_rawcp = (uint8_t *)bp;
254 40 : tif->tif_rawcc = cc;
255 40 : return (1);
256 : }
257 :
258 : /*
259 : * Decode a string of 24-bit pixels.
260 : */
261 0 : static int LogLuvDecode24(TIFF *tif, uint8_t *op, tmsize_t occ, uint16_t s)
262 : {
263 : static const char module[] = "LogLuvDecode24";
264 0 : LogLuvState *sp = DecoderState(tif);
265 : tmsize_t cc;
266 : tmsize_t i;
267 : tmsize_t npixels;
268 : unsigned char *bp;
269 : uint32_t *tp;
270 :
271 : (void)s;
272 0 : assert(s == 0);
273 0 : assert(sp != NULL);
274 :
275 0 : npixels = occ / sp->pixel_size;
276 :
277 0 : if (sp->user_datafmt == SGILOGDATAFMT_RAW)
278 0 : tp = (uint32_t *)op;
279 : else
280 : {
281 0 : if (sp->tbuflen < npixels)
282 : {
283 0 : TIFFErrorExtR(tif, module, "Translation buffer too short");
284 0 : return (0);
285 : }
286 0 : tp = (uint32_t *)sp->tbuf;
287 : }
288 : /* copy to array of uint32_t */
289 0 : bp = (unsigned char *)tif->tif_rawcp;
290 0 : cc = tif->tif_rawcc;
291 0 : for (i = 0; i < npixels && cc >= 3; i++)
292 : {
293 0 : tp[i] = (uint32_t)bp[0] << 16 | (uint32_t)bp[1] << 8 | bp[2];
294 0 : bp += 3;
295 0 : cc -= 3;
296 : }
297 0 : tif->tif_rawcp = (uint8_t *)bp;
298 0 : tif->tif_rawcc = cc;
299 0 : if (i != npixels)
300 : {
301 0 : TIFFErrorExtR(tif, module,
302 : "Not enough data at row %" PRIu32
303 : " (short %" TIFF_SSIZE_FORMAT " pixels)",
304 : tif->tif_dir.td_row, npixels - i);
305 0 : return (0);
306 : }
307 0 : (*sp->tfunc)(sp, op, npixels);
308 0 : return (1);
309 : }
310 :
311 : /*
312 : * Decode a string of 32-bit pixels.
313 : */
314 0 : static int LogLuvDecode32(TIFF *tif, uint8_t *op, tmsize_t occ, uint16_t s)
315 : {
316 : static const char module[] = "LogLuvDecode32";
317 : LogLuvState *sp;
318 : int shft;
319 : tmsize_t i;
320 : tmsize_t npixels;
321 : unsigned char *bp;
322 : uint32_t *tp;
323 : uint32_t b;
324 : tmsize_t cc;
325 : int rc;
326 :
327 : (void)s;
328 0 : assert(s == 0);
329 0 : sp = DecoderState(tif);
330 0 : assert(sp != NULL);
331 :
332 0 : npixels = occ / sp->pixel_size;
333 :
334 0 : if (sp->user_datafmt == SGILOGDATAFMT_RAW)
335 0 : tp = (uint32_t *)op;
336 : else
337 : {
338 0 : if (sp->tbuflen < npixels)
339 : {
340 0 : TIFFErrorExtR(tif, module, "Translation buffer too short");
341 0 : return (0);
342 : }
343 0 : tp = (uint32_t *)sp->tbuf;
344 : }
345 0 : _TIFFmemset((void *)tp, 0, (tmsize_t)((size_t)npixels * sizeof(tp[0])));
346 :
347 0 : bp = (unsigned char *)tif->tif_rawcp;
348 0 : cc = tif->tif_rawcc;
349 : /* get each byte string */
350 0 : for (shft = 24; shft >= 0; shft -= 8)
351 : {
352 0 : for (i = 0; i < npixels && cc > 0;)
353 : {
354 0 : if (*bp >= 128)
355 : { /* run */
356 0 : if (cc < 2)
357 0 : break;
358 0 : rc = *bp++ + (2 - 128);
359 0 : b = (uint32_t)*bp++ << shft;
360 0 : cc -= 2;
361 0 : while (rc-- && i < npixels)
362 0 : tp[i++] |= b;
363 : }
364 : else
365 : { /* non-run */
366 0 : rc = *bp++; /* nul is noop */
367 0 : while (--cc && rc-- && i < npixels)
368 0 : tp[i++] |= (uint32_t)*bp++ << shft;
369 : }
370 : }
371 0 : if (i != npixels)
372 : {
373 0 : TIFFErrorExtR(tif, module,
374 : "Not enough data at row %" PRIu32
375 : " (short %" TIFF_SSIZE_FORMAT " pixels)",
376 : tif->tif_dir.td_row, npixels - i);
377 0 : tif->tif_rawcp = (uint8_t *)bp;
378 0 : tif->tif_rawcc = cc;
379 0 : return (0);
380 : }
381 : }
382 0 : (*sp->tfunc)(sp, op, npixels);
383 0 : tif->tif_rawcp = (uint8_t *)bp;
384 0 : tif->tif_rawcc = cc;
385 0 : return (1);
386 : }
387 :
388 : /*
389 : * Decode a strip of pixels. We break it into rows to
390 : * maintain synchrony with the encode algorithm, which
391 : * is row by row.
392 : */
393 2 : static int LogLuvDecodeStrip(TIFF *tif, uint8_t *bp, tmsize_t cc, uint16_t s)
394 : {
395 2 : tmsize_t rowlen = TIFFScanlineSize(tif);
396 :
397 2 : if (rowlen == 0)
398 0 : return 0;
399 :
400 2 : assert(cc % rowlen == 0);
401 42 : while (cc && (*tif->tif_decoderow)(tif, bp, rowlen, s))
402 : {
403 40 : bp += rowlen;
404 40 : cc -= rowlen;
405 : }
406 2 : return (cc == 0);
407 : }
408 :
409 : /*
410 : * Decode a tile of pixels. We break it into rows to
411 : * maintain synchrony with the encode algorithm, which
412 : * is row by row.
413 : */
414 0 : static int LogLuvDecodeTile(TIFF *tif, uint8_t *bp, tmsize_t cc, uint16_t s)
415 : {
416 0 : tmsize_t rowlen = TIFFTileRowSize(tif);
417 :
418 0 : if (rowlen == 0)
419 0 : return 0;
420 :
421 0 : assert(cc % rowlen == 0);
422 0 : while (cc && (*tif->tif_decoderow)(tif, bp, rowlen, s))
423 : {
424 0 : bp += rowlen;
425 0 : cc -= rowlen;
426 : }
427 0 : return (cc == 0);
428 : }
429 :
430 : /*
431 : * Encode a row of 16-bit pixels.
432 : */
433 0 : static int LogL16Encode(TIFF *tif, uint8_t *bp, tmsize_t cc, uint16_t s)
434 : {
435 : static const char module[] = "LogL16Encode";
436 0 : LogLuvState *sp = EncoderState(tif);
437 : int shft;
438 : tmsize_t i;
439 : tmsize_t j;
440 : tmsize_t npixels;
441 : uint8_t *op;
442 : int16_t *tp;
443 : int16_t b;
444 : tmsize_t occ;
445 0 : int rc = 0, mask;
446 : tmsize_t beg;
447 :
448 : (void)s;
449 0 : assert(s == 0);
450 0 : assert(sp != NULL);
451 0 : npixels = cc / sp->pixel_size;
452 :
453 0 : if (sp->user_datafmt == SGILOGDATAFMT_16BIT)
454 0 : tp = (int16_t *)bp;
455 : else
456 : {
457 0 : tp = (int16_t *)sp->tbuf;
458 0 : if (sp->tbuflen < npixels)
459 : {
460 0 : TIFFErrorExtR(tif, module, "Translation buffer too short");
461 0 : return (0);
462 : }
463 0 : (*sp->tfunc)(sp, bp, npixels);
464 : }
465 : /* compress each byte string */
466 0 : op = tif->tif_rawcp;
467 0 : occ = tif->tif_rawdatasize - tif->tif_rawcc;
468 0 : for (shft = 8; shft >= 0; shft -= 8)
469 : {
470 0 : for (i = 0; i < npixels; i += rc)
471 : {
472 0 : if (occ < 4)
473 : {
474 0 : tif->tif_rawcp = op;
475 0 : tif->tif_rawcc = tif->tif_rawdatasize - occ;
476 0 : if (!TIFFFlushData1(tif))
477 0 : return (0);
478 0 : op = tif->tif_rawcp;
479 0 : occ = tif->tif_rawdatasize - tif->tif_rawcc;
480 : }
481 0 : mask = 0xff << shft; /* find next run */
482 0 : for (beg = i; beg < npixels; beg += rc)
483 : {
484 0 : b = (int16_t)(tp[beg] & mask);
485 0 : rc = 1;
486 0 : while (rc < 127 + 2 && beg + rc < npixels &&
487 0 : (tp[beg + rc] & mask) == b)
488 0 : rc++;
489 0 : if (rc >= MINRUN)
490 0 : break; /* long enough */
491 : }
492 0 : if (beg - i > 1 && beg - i < MINRUN)
493 : {
494 0 : b = (int16_t)(tp[i] & mask); /*check short run */
495 0 : j = i + 1;
496 0 : while ((tp[j++] & mask) == b)
497 0 : if (j == beg)
498 : {
499 0 : *op++ = (uint8_t)(128 - 2 + j - i);
500 0 : *op++ = (uint8_t)(b >> shft);
501 0 : occ -= 2;
502 0 : i = beg;
503 0 : break;
504 : }
505 : }
506 0 : while (i < beg)
507 : { /* write out non-run */
508 0 : if ((j = beg - i) > 127)
509 0 : j = 127;
510 0 : if (occ < j + 3)
511 : {
512 0 : tif->tif_rawcp = op;
513 0 : tif->tif_rawcc = tif->tif_rawdatasize - occ;
514 0 : if (!TIFFFlushData1(tif))
515 0 : return (0);
516 0 : op = tif->tif_rawcp;
517 0 : occ = tif->tif_rawdatasize - tif->tif_rawcc;
518 : }
519 0 : *op++ = (uint8_t)j;
520 0 : occ--;
521 0 : while (j--)
522 : {
523 0 : *op++ = (uint8_t)(tp[i++] >> shft & 0xff);
524 0 : occ--;
525 : }
526 : }
527 0 : if (rc >= MINRUN)
528 : { /* write out run */
529 0 : *op++ = (uint8_t)(128 - 2 + rc);
530 0 : *op++ = (uint8_t)(tp[beg] >> shft & 0xff);
531 0 : occ -= 2;
532 : }
533 : else
534 0 : rc = 0;
535 : }
536 : }
537 0 : tif->tif_rawcp = op;
538 0 : tif->tif_rawcc = tif->tif_rawdatasize - occ;
539 :
540 0 : return (1);
541 : }
542 :
543 : /*
544 : * Encode a row of 24-bit pixels.
545 : */
546 0 : static int LogLuvEncode24(TIFF *tif, uint8_t *bp, tmsize_t cc, uint16_t s)
547 : {
548 : static const char module[] = "LogLuvEncode24";
549 0 : LogLuvState *sp = EncoderState(tif);
550 : tmsize_t i;
551 : tmsize_t npixels;
552 : tmsize_t occ;
553 : uint8_t *op;
554 : uint32_t *tp;
555 :
556 : (void)s;
557 0 : assert(s == 0);
558 0 : assert(sp != NULL);
559 0 : npixels = cc / sp->pixel_size;
560 :
561 0 : if (sp->user_datafmt == SGILOGDATAFMT_RAW)
562 0 : tp = (uint32_t *)bp;
563 : else
564 : {
565 0 : tp = (uint32_t *)sp->tbuf;
566 0 : if (sp->tbuflen < npixels)
567 : {
568 0 : TIFFErrorExtR(tif, module, "Translation buffer too short");
569 0 : return (0);
570 : }
571 0 : (*sp->tfunc)(sp, bp, npixels);
572 : }
573 : /* write out encoded pixels */
574 0 : op = tif->tif_rawcp;
575 0 : occ = tif->tif_rawdatasize - tif->tif_rawcc;
576 0 : for (i = npixels; i--;)
577 : {
578 0 : if (occ < 3)
579 : {
580 0 : tif->tif_rawcp = op;
581 0 : tif->tif_rawcc = tif->tif_rawdatasize - occ;
582 0 : if (!TIFFFlushData1(tif))
583 0 : return (0);
584 0 : op = tif->tif_rawcp;
585 0 : occ = tif->tif_rawdatasize - tif->tif_rawcc;
586 : }
587 0 : *op++ = (uint8_t)(*tp >> 16);
588 0 : *op++ = (uint8_t)(*tp >> 8 & 0xff);
589 0 : *op++ = (uint8_t)(*tp++ & 0xff);
590 0 : occ -= 3;
591 : }
592 0 : tif->tif_rawcp = op;
593 0 : tif->tif_rawcc = tif->tif_rawdatasize - occ;
594 :
595 0 : return (1);
596 : }
597 :
598 : /*
599 : * Encode a row of 32-bit pixels.
600 : */
601 0 : static int LogLuvEncode32(TIFF *tif, uint8_t *bp, tmsize_t cc, uint16_t s)
602 : {
603 : static const char module[] = "LogLuvEncode32";
604 0 : LogLuvState *sp = EncoderState(tif);
605 : int shft;
606 : tmsize_t i;
607 : tmsize_t j;
608 : tmsize_t npixels;
609 : uint8_t *op;
610 : uint32_t *tp;
611 : uint32_t b;
612 : tmsize_t occ;
613 0 : int rc = 0;
614 : tmsize_t beg;
615 :
616 : (void)s;
617 0 : assert(s == 0);
618 0 : assert(sp != NULL);
619 :
620 0 : npixels = cc / sp->pixel_size;
621 :
622 0 : if (sp->user_datafmt == SGILOGDATAFMT_RAW)
623 0 : tp = (uint32_t *)bp;
624 : else
625 : {
626 0 : tp = (uint32_t *)sp->tbuf;
627 0 : if (sp->tbuflen < npixels)
628 : {
629 0 : TIFFErrorExtR(tif, module, "Translation buffer too short");
630 0 : return (0);
631 : }
632 0 : (*sp->tfunc)(sp, bp, npixels);
633 : }
634 : /* compress each byte string */
635 0 : op = tif->tif_rawcp;
636 0 : occ = tif->tif_rawdatasize - tif->tif_rawcc;
637 0 : for (shft = 24; shft >= 0; shft -= 8)
638 : {
639 0 : const uint32_t mask = 0xffU << shft; /* find next run */
640 0 : for (i = 0; i < npixels; i += rc)
641 : {
642 0 : if (occ < 4)
643 : {
644 0 : tif->tif_rawcp = op;
645 0 : tif->tif_rawcc = tif->tif_rawdatasize - occ;
646 0 : if (!TIFFFlushData1(tif))
647 0 : return (0);
648 0 : op = tif->tif_rawcp;
649 0 : occ = tif->tif_rawdatasize - tif->tif_rawcc;
650 : }
651 0 : for (beg = i; beg < npixels; beg += rc)
652 : {
653 0 : b = tp[beg] & mask;
654 0 : rc = 1;
655 0 : while (rc < 127 + 2 && beg + rc < npixels &&
656 0 : (tp[beg + rc] & mask) == b)
657 0 : rc++;
658 0 : if (rc >= MINRUN)
659 0 : break; /* long enough */
660 : }
661 0 : if (beg - i > 1 && beg - i < MINRUN)
662 : {
663 0 : b = tp[i] & mask; /* check short run */
664 0 : j = i + 1;
665 0 : while ((tp[j++] & mask) == b)
666 0 : if (j == beg)
667 : {
668 0 : *op++ = (uint8_t)(128 - 2 + j - i);
669 0 : *op++ = (uint8_t)(b >> shft);
670 0 : occ -= 2;
671 0 : i = beg;
672 0 : break;
673 : }
674 : }
675 0 : while (i < beg)
676 : { /* write out non-run */
677 0 : if ((j = beg - i) > 127)
678 0 : j = 127;
679 0 : if (occ < j + 3)
680 : {
681 0 : tif->tif_rawcp = op;
682 0 : tif->tif_rawcc = tif->tif_rawdatasize - occ;
683 0 : if (!TIFFFlushData1(tif))
684 0 : return (0);
685 0 : op = tif->tif_rawcp;
686 0 : occ = tif->tif_rawdatasize - tif->tif_rawcc;
687 : }
688 0 : *op++ = (uint8_t)j;
689 0 : occ--;
690 0 : while (j--)
691 : {
692 0 : *op++ = (uint8_t)(tp[i++] >> shft & 0xff);
693 0 : occ--;
694 : }
695 : }
696 0 : if (rc >= MINRUN)
697 : { /* write out run */
698 0 : *op++ = (uint8_t)(128 - 2 + rc);
699 0 : *op++ = (uint8_t)(tp[beg] >> shft & 0xff);
700 0 : occ -= 2;
701 : }
702 : else
703 0 : rc = 0;
704 : }
705 : }
706 0 : tif->tif_rawcp = op;
707 0 : tif->tif_rawcc = tif->tif_rawdatasize - occ;
708 :
709 0 : return (1);
710 : }
711 :
712 : /*
713 : * Encode a strip of pixels. We break it into rows to
714 : * avoid encoding runs across row boundaries.
715 : */
716 0 : static int LogLuvEncodeStrip(TIFF *tif, uint8_t *bp, tmsize_t cc, uint16_t s)
717 : {
718 0 : tmsize_t rowlen = TIFFScanlineSize(tif);
719 :
720 0 : if (rowlen == 0)
721 0 : return 0;
722 :
723 0 : assert(cc % rowlen == 0);
724 0 : while (cc && (*tif->tif_encoderow)(tif, bp, rowlen, s) == 1)
725 : {
726 0 : bp += rowlen;
727 0 : cc -= rowlen;
728 : }
729 0 : return (cc == 0);
730 : }
731 :
732 : /*
733 : * Encode a tile of pixels. We break it into rows to
734 : * avoid encoding runs across row boundaries.
735 : */
736 0 : static int LogLuvEncodeTile(TIFF *tif, uint8_t *bp, tmsize_t cc, uint16_t s)
737 : {
738 0 : tmsize_t rowlen = TIFFTileRowSize(tif);
739 :
740 0 : if (rowlen == 0)
741 0 : return 0;
742 :
743 0 : assert(cc % rowlen == 0);
744 0 : while (cc && (*tif->tif_encoderow)(tif, bp, rowlen, s) == 1)
745 : {
746 0 : bp += rowlen;
747 0 : cc -= rowlen;
748 : }
749 0 : return (cc == 0);
750 : }
751 :
752 : /*
753 : * Encode/Decode functions for converting to and from user formats.
754 : */
755 :
756 : #include "uvcode.h"
757 :
758 : #ifndef UVSCALE
759 : #define U_NEU 0.210526316
760 : #define V_NEU 0.473684211
761 : #define UVSCALE 410.
762 : #endif
763 :
764 : #ifndef M_LN2
765 : #define M_LN2 0.69314718055994530942
766 : #endif
767 : #ifndef M_PI
768 : #define M_PI 3.14159265358979323846
769 : #endif
770 :
771 : #define TIFF_RAND_MAX 32767
772 :
773 : // From POSIX.1-2001 as an example of an implementation of rand()
774 0 : static uint32_t _TIFFRand(void)
775 : {
776 : static uint32_t nCounter = 0;
777 0 : if (!nCounter)
778 0 : nCounter = (uint32_t)(time(NULL) & UINT32_MAX);
779 0 : ++nCounter;
780 0 : uint32_t nCounterLocal =
781 0 : (uint32_t)(((uint64_t)(nCounter) * 1103515245U + 12345U) & UINT32_MAX);
782 0 : nCounter = nCounterLocal;
783 0 : return (nCounterLocal / 65536U) % (TIFF_RAND_MAX + 1);
784 : }
785 :
786 0 : static int tiff_itrunc(double x, int m)
787 : {
788 0 : if (m == SGILOGENCODE_NODITHER)
789 0 : return (int)x;
790 0 : return (int)(x + _TIFFRand() * (1. / TIFF_RAND_MAX) - .5);
791 : }
792 :
793 : #if !LOGLUV_PUBLIC
794 : static
795 : #endif
796 400 : double LogL16toY(int p16) /* compute luminance from 16-bit LogL */
797 : {
798 400 : int Le = p16 & 0x7fff;
799 : double Y;
800 :
801 400 : if (!Le)
802 0 : return (0.);
803 400 : Y = exp(M_LN2 / 256. * (Le + .5) - M_LN2 * 64.);
804 400 : return (!(p16 & 0x8000) ? Y : -Y);
805 : }
806 :
807 : #if !LOGLUV_PUBLIC
808 : static
809 : #endif
810 0 : int LogL16fromY(double Y, int em) /* get 16-bit LogL from Y */
811 : {
812 0 : if (Y >= 1.8371976e19)
813 0 : return (0x7fff);
814 0 : if (Y <= -1.8371976e19)
815 0 : return (0xffff);
816 0 : if (Y > 5.4136769e-20)
817 0 : return tiff_itrunc(256. * (log2(Y) + 64.), em);
818 0 : if (Y < -5.4136769e-20)
819 0 : return (~0x7fff | tiff_itrunc(256. * (log2(-Y) + 64.), em));
820 0 : return (0);
821 : }
822 :
823 0 : static void L16toY(LogLuvState *sp, uint8_t *op, tmsize_t n)
824 : {
825 0 : int16_t *l16 = (int16_t *)sp->tbuf;
826 0 : float *yp = (float *)op;
827 :
828 0 : while (n-- > 0)
829 0 : *yp++ = (float)LogL16toY(*l16++);
830 0 : }
831 :
832 20 : static void L16toGry(LogLuvState *sp, uint8_t *op, tmsize_t n)
833 : {
834 20 : int16_t *l16 = (int16_t *)sp->tbuf;
835 20 : uint8_t *gp = (uint8_t *)op;
836 :
837 420 : while (n-- > 0)
838 : {
839 400 : double Y = LogL16toY(*l16++);
840 800 : *gp++ = (uint8_t)((Y <= 0.) ? 0
841 : : (Y >= 1.) ? 255
842 400 : : (int)(256. * sqrt(Y)));
843 : }
844 20 : }
845 :
846 0 : static void L16fromY(LogLuvState *sp, uint8_t *op, tmsize_t n)
847 : {
848 0 : int16_t *l16 = (int16_t *)sp->tbuf;
849 0 : float *yp = (float *)op;
850 :
851 0 : while (n-- > 0)
852 0 : *l16++ = (int16_t)(LogL16fromY((double)*yp++, sp->encode_meth));
853 0 : }
854 :
855 : #if !LOGLUV_PUBLIC
856 : static
857 : #endif
858 0 : void XYZtoRGB24(float *xyz, uint8_t *rgb)
859 : {
860 : double r, g, b;
861 : /* assume CCIR-709 primaries */
862 0 : r = 2.690 * (double)xyz[0] + -1.276 * (double)xyz[1] +
863 0 : -0.414 * (double)xyz[2];
864 0 : g = -1.022 * (double)xyz[0] + 1.978 * (double)xyz[1] +
865 0 : 0.044 * (double)xyz[2];
866 0 : b = 0.061 * (double)xyz[0] + -0.224 * (double)xyz[1] +
867 0 : 1.163 * (double)xyz[2];
868 : /* assume 2.0 gamma for speed */
869 : /* could use integer sqrt approx., but this is probably faster */
870 0 : rgb[0] = (uint8_t)((r <= 0.) ? 0 : (r >= 1.) ? 255 : (int)(256. * sqrt(r)));
871 0 : rgb[1] = (uint8_t)((g <= 0.) ? 0 : (g >= 1.) ? 255 : (int)(256. * sqrt(g)));
872 0 : rgb[2] = (uint8_t)((b <= 0.) ? 0 : (b >= 1.) ? 255 : (int)(256. * sqrt(b)));
873 0 : }
874 :
875 : #if !LOGLUV_PUBLIC
876 : static
877 : #endif
878 0 : double LogL10toY(int p10) /* compute luminance from 10-bit LogL */
879 : {
880 0 : if (p10 == 0)
881 0 : return (0.);
882 0 : return (exp(M_LN2 / 64. * (p10 + .5) - M_LN2 * 12.));
883 : }
884 :
885 : #if !LOGLUV_PUBLIC
886 : static
887 : #endif
888 0 : int LogL10fromY(double Y, int em) /* get 10-bit LogL from Y */
889 : {
890 0 : if (Y >= 15.742)
891 0 : return (0x3ff);
892 0 : else if (Y <= .00024283)
893 0 : return (0);
894 : else
895 0 : return tiff_itrunc(64. * (log2(Y) + 12.), em);
896 : }
897 :
898 : #define NANGLES 100
899 : #define uv2ang(u, v) \
900 : ((NANGLES * .499999999 / M_PI) * atan2((v) - V_NEU, (u) - U_NEU) + \
901 : .5 * NANGLES)
902 :
903 0 : static int oog_encode(double u, double v) /* encode out-of-gamut chroma */
904 : {
905 : static int oog_table[NANGLES];
906 : static int initialized = 0;
907 : int i;
908 :
909 0 : if (!initialized)
910 : { /* set up perimeter table */
911 : double eps[NANGLES], ua, va, ang, epsa;
912 : int ui, vi, ustep;
913 0 : for (i = NANGLES; i--;)
914 0 : eps[i] = 2.;
915 0 : for (vi = UV_NVS; vi--;)
916 : {
917 0 : va = (double)UV_VSTART + ((double)vi + .5) * (double)UV_SQSIZ;
918 0 : ustep = uv_row[vi].nus - 1;
919 0 : if (vi == UV_NVS - 1 || vi == 0 || ustep <= 0)
920 0 : ustep = 1;
921 0 : for (ui = uv_row[vi].nus - 1; ui >= 0; ui -= ustep)
922 : {
923 0 : ua = (double)uv_row[vi].ustart +
924 0 : ((double)ui + .5) * (double)UV_SQSIZ;
925 0 : ang = uv2ang(ua, va);
926 0 : i = (int)ang;
927 0 : epsa = fabs(ang - (i + .5));
928 0 : if (epsa < eps[i])
929 : {
930 0 : oog_table[i] = uv_row[vi].ncum + ui;
931 0 : eps[i] = epsa;
932 : }
933 : }
934 : }
935 0 : for (i = NANGLES; i--;) /* fill any holes */
936 0 : if (eps[i] > 1.5)
937 : {
938 : int i1, i2;
939 0 : for (i1 = 1; i1 < NANGLES / 2; i1++)
940 0 : if (eps[(i + i1) % NANGLES] < 1.5)
941 0 : break;
942 0 : for (i2 = 1; i2 < NANGLES / 2; i2++)
943 0 : if (eps[(i + NANGLES - i2) % NANGLES] < 1.5)
944 0 : break;
945 0 : if (i1 < i2)
946 0 : oog_table[i] = oog_table[(i + i1) % NANGLES];
947 : else
948 0 : oog_table[i] = oog_table[(i + NANGLES - i2) % NANGLES];
949 : }
950 0 : initialized = 1;
951 : }
952 0 : i = (int)uv2ang(u, v); /* look up hue angle */
953 0 : return (oog_table[i]);
954 : }
955 :
956 : #undef uv2ang
957 : #undef NANGLES
958 :
959 : #if !LOGLUV_PUBLIC
960 : static
961 : #endif
962 0 : int uv_encode(double u, double v, int em) /* encode (u',v') coordinates */
963 : {
964 : unsigned int vi;
965 : int ui;
966 :
967 : /* check for NaN */
968 0 : if (isnan(u) || isnan(v))
969 : {
970 0 : u = U_NEU;
971 0 : v = V_NEU;
972 : }
973 :
974 0 : if ((double)v < (double)UV_VSTART)
975 0 : return oog_encode(u, v);
976 0 : vi = (unsigned int)tiff_itrunc(
977 0 : ((double)v - (double)UV_VSTART) * (1. / (double)UV_SQSIZ), em);
978 0 : if (vi >= UV_NVS)
979 0 : return oog_encode(u, v);
980 0 : if ((double)u < (double)uv_row[vi].ustart)
981 0 : return oog_encode(u, v);
982 0 : ui = tiff_itrunc(
983 0 : ((double)u - (double)uv_row[vi].ustart) * (1. / (double)UV_SQSIZ), em);
984 0 : if (ui >= uv_row[vi].nus)
985 0 : return oog_encode(u, v);
986 :
987 0 : return (uv_row[vi].ncum + ui);
988 : }
989 :
990 : #if !LOGLUV_PUBLIC
991 : static
992 : #endif
993 0 : int uv_decode(double *up, double *vp, int c) /* decode (u',v') index */
994 : {
995 : unsigned int upper, lower;
996 : int ui;
997 : unsigned int vi;
998 :
999 0 : if (c < 0 || c >= UV_NDIVS)
1000 0 : return (-1);
1001 0 : lower = 0; /* binary search */
1002 0 : upper = UV_NVS;
1003 0 : while (upper - lower > 1)
1004 : {
1005 0 : vi = (lower + upper) >> 1;
1006 0 : ui = c - uv_row[vi].ncum;
1007 0 : if (ui > 0)
1008 0 : lower = vi;
1009 0 : else if (ui < 0)
1010 0 : upper = vi;
1011 : else
1012 : {
1013 0 : lower = vi;
1014 0 : break;
1015 : }
1016 : }
1017 0 : vi = lower;
1018 0 : ui = c - uv_row[vi].ncum;
1019 0 : *up = (double)uv_row[vi].ustart + ((double)ui + .5) * (double)UV_SQSIZ;
1020 0 : *vp = (double)UV_VSTART + ((double)vi + .5) * (double)UV_SQSIZ;
1021 0 : return (0);
1022 : }
1023 :
1024 : #if !LOGLUV_PUBLIC
1025 : static
1026 : #endif
1027 0 : void LogLuv24toXYZ(uint32_t p, float *XYZ)
1028 : {
1029 : int Ce;
1030 : double L, u, v, s, x, y;
1031 : /* decode luminance */
1032 0 : L = LogL10toY(p >> 14 & 0x3ff);
1033 0 : if (L <= 0.)
1034 : {
1035 0 : XYZ[0] = XYZ[1] = XYZ[2] = 0.;
1036 0 : return;
1037 : }
1038 : /* decode color */
1039 0 : Ce = p & 0x3fff;
1040 0 : if (uv_decode(&u, &v, Ce) < 0)
1041 : {
1042 0 : u = U_NEU;
1043 0 : v = V_NEU;
1044 : }
1045 0 : s = 1. / (6. * u - 16. * v + 12.);
1046 0 : x = 9. * u * s;
1047 0 : y = 4. * v * s;
1048 : /* convert to XYZ */
1049 0 : XYZ[0] = (float)(x / y * L);
1050 0 : XYZ[1] = (float)L;
1051 0 : XYZ[2] = (float)((1. - x - y) / y * L);
1052 : }
1053 :
1054 : #if !LOGLUV_PUBLIC
1055 : static
1056 : #endif
1057 0 : uint32_t LogLuv24fromXYZ(float *XYZ, int em)
1058 : {
1059 : int Le, Ce;
1060 : double u, v, s;
1061 : /* encode luminance */
1062 0 : Le = LogL10fromY((double)XYZ[1], em);
1063 : /* encode color */
1064 0 : s = (double)XYZ[0] + 15. * (double)XYZ[1] + 3. * (double)XYZ[2];
1065 0 : if (!Le || s <= 0.)
1066 : {
1067 0 : u = U_NEU;
1068 0 : v = V_NEU;
1069 : }
1070 : else
1071 : {
1072 0 : u = 4. * (double)XYZ[0] / s;
1073 0 : v = 9. * (double)XYZ[1] / s;
1074 : }
1075 0 : Ce = uv_encode(u, v, em);
1076 0 : if (Ce < 0) /* never happens */
1077 0 : Ce = uv_encode(U_NEU, V_NEU, SGILOGENCODE_NODITHER);
1078 : /* combine encodings */
1079 0 : return (uint32_t)Le << 14 | (uint32_t)Ce;
1080 : }
1081 :
1082 0 : static void Luv24toXYZ(LogLuvState *sp, uint8_t *op, tmsize_t n)
1083 : {
1084 0 : uint32_t *luv = (uint32_t *)sp->tbuf;
1085 0 : float *xyz = (float *)op;
1086 :
1087 0 : while (n-- > 0)
1088 : {
1089 0 : LogLuv24toXYZ(*luv, xyz);
1090 0 : xyz += 3;
1091 0 : luv++;
1092 : }
1093 0 : }
1094 :
1095 0 : static void Luv24toLuv48(LogLuvState *sp, uint8_t *op, tmsize_t n)
1096 : {
1097 0 : uint32_t *luv = (uint32_t *)sp->tbuf;
1098 0 : int16_t *luv3 = (int16_t *)op;
1099 :
1100 0 : while (n-- > 0)
1101 : {
1102 : double u, v;
1103 :
1104 0 : *luv3++ = (int16_t)((*luv >> 12 & 0xffd) + 13314);
1105 0 : if (uv_decode(&u, &v, *luv & 0x3fff) < 0)
1106 : {
1107 0 : u = U_NEU;
1108 0 : v = V_NEU;
1109 : }
1110 0 : *luv3++ = (int16_t)(u * (1 << 15));
1111 0 : *luv3++ = (int16_t)(v * (1 << 15));
1112 0 : luv++;
1113 : }
1114 0 : }
1115 :
1116 0 : static void Luv24toRGB(LogLuvState *sp, uint8_t *op, tmsize_t n)
1117 : {
1118 0 : uint32_t *luv = (uint32_t *)sp->tbuf;
1119 0 : uint8_t *rgb = (uint8_t *)op;
1120 :
1121 0 : while (n-- > 0)
1122 : {
1123 : float xyz[3];
1124 :
1125 0 : LogLuv24toXYZ(*luv++, xyz);
1126 0 : XYZtoRGB24(xyz, rgb);
1127 0 : rgb += 3;
1128 : }
1129 0 : }
1130 :
1131 0 : static void Luv24fromXYZ(LogLuvState *sp, uint8_t *op, tmsize_t n)
1132 : {
1133 0 : uint32_t *luv = (uint32_t *)sp->tbuf;
1134 0 : float *xyz = (float *)op;
1135 :
1136 0 : while (n-- > 0)
1137 : {
1138 0 : *luv++ = LogLuv24fromXYZ(xyz, sp->encode_meth);
1139 0 : xyz += 3;
1140 : }
1141 0 : }
1142 :
1143 0 : static void Luv24fromLuv48(LogLuvState *sp, uint8_t *op, tmsize_t n)
1144 : {
1145 0 : uint32_t *luv = (uint32_t *)sp->tbuf;
1146 0 : int16_t *luv3 = (int16_t *)op;
1147 :
1148 0 : while (n-- > 0)
1149 : {
1150 : int Le, Ce;
1151 :
1152 0 : if (luv3[0] <= 0)
1153 0 : Le = 0;
1154 0 : else if (luv3[0] >= (1 << 12) + 3314)
1155 0 : Le = (1 << 10) - 1;
1156 0 : else if (sp->encode_meth == SGILOGENCODE_NODITHER)
1157 0 : Le = (luv3[0] - 3314) >> 2;
1158 : else
1159 0 : Le = tiff_itrunc(.25 * (luv3[0] - 3314.), sp->encode_meth);
1160 :
1161 0 : Ce = uv_encode((luv3[1] + .5) / (1 << 15), (luv3[2] + .5) / (1 << 15),
1162 : sp->encode_meth);
1163 0 : if (Ce < 0) /* never happens */
1164 0 : Ce = uv_encode(U_NEU, V_NEU, SGILOGENCODE_NODITHER);
1165 0 : *luv++ = (uint32_t)Le << 14 | (uint32_t)Ce;
1166 0 : luv3 += 3;
1167 : }
1168 0 : }
1169 :
1170 : #if !LOGLUV_PUBLIC
1171 : static
1172 : #endif
1173 0 : void LogLuv32toXYZ(uint32_t p, float *XYZ)
1174 : {
1175 : double L, u, v, s, x, y;
1176 : /* decode luminance */
1177 0 : L = LogL16toY((int)p >> 16);
1178 0 : if (L <= 0.)
1179 : {
1180 0 : XYZ[0] = XYZ[1] = XYZ[2] = 0.;
1181 0 : return;
1182 : }
1183 : /* decode color */
1184 0 : u = 1. / UVSCALE * ((p >> 8 & 0xff) + .5);
1185 0 : v = 1. / UVSCALE * ((p & 0xff) + .5);
1186 0 : s = 1. / (6. * u - 16. * v + 12.);
1187 0 : x = 9. * u * s;
1188 0 : y = 4. * v * s;
1189 : /* convert to XYZ */
1190 0 : XYZ[0] = (float)(x / y * L);
1191 0 : XYZ[1] = (float)L;
1192 0 : XYZ[2] = (float)((1. - x - y) / y * L);
1193 : }
1194 :
1195 : #if !LOGLUV_PUBLIC
1196 : static
1197 : #endif
1198 0 : uint32_t LogLuv32fromXYZ(float *XYZ, int em)
1199 : {
1200 : unsigned int Le, ue, ve;
1201 : double u, v, s;
1202 : /* encode luminance */
1203 0 : Le = (unsigned int)LogL16fromY((double)XYZ[1], em);
1204 : /* encode color */
1205 0 : s = (double)XYZ[0] + 15. * (double)XYZ[1] + 3. * (double)XYZ[2];
1206 0 : if (!Le || s <= 0.)
1207 : {
1208 0 : u = U_NEU;
1209 0 : v = V_NEU;
1210 : }
1211 : else
1212 : {
1213 0 : u = 4. * (double)XYZ[0] / s;
1214 0 : v = 9. * (double)XYZ[1] / s;
1215 : }
1216 0 : if (u <= 0.)
1217 0 : ue = 0;
1218 : else
1219 0 : ue = (unsigned int)tiff_itrunc(UVSCALE * u, em);
1220 0 : if (ue > 255)
1221 0 : ue = 255;
1222 0 : if (v <= 0.)
1223 0 : ve = 0;
1224 : else
1225 0 : ve = (unsigned int)tiff_itrunc(UVSCALE * v, em);
1226 0 : if (ve > 255)
1227 0 : ve = 255;
1228 : /* combine encodings */
1229 0 : return (Le << 16 | ue << 8 | ve);
1230 : }
1231 :
1232 0 : static void Luv32toXYZ(LogLuvState *sp, uint8_t *op, tmsize_t n)
1233 : {
1234 0 : uint32_t *luv = (uint32_t *)sp->tbuf;
1235 0 : float *xyz = (float *)op;
1236 :
1237 0 : while (n-- > 0)
1238 : {
1239 0 : LogLuv32toXYZ(*luv++, xyz);
1240 0 : xyz += 3;
1241 : }
1242 0 : }
1243 :
1244 0 : static void Luv32toLuv48(LogLuvState *sp, uint8_t *op, tmsize_t n)
1245 : {
1246 0 : uint32_t *luv = (uint32_t *)sp->tbuf;
1247 0 : int16_t *luv3 = (int16_t *)op;
1248 :
1249 0 : while (n-- > 0)
1250 : {
1251 : double u, v;
1252 :
1253 0 : *luv3++ = (int16_t)(*luv >> 16);
1254 0 : u = 1. / UVSCALE * ((*luv >> 8 & 0xff) + .5);
1255 0 : v = 1. / UVSCALE * ((*luv & 0xff) + .5);
1256 0 : *luv3++ = (int16_t)(u * (1 << 15));
1257 0 : *luv3++ = (int16_t)(v * (1 << 15));
1258 0 : luv++;
1259 : }
1260 0 : }
1261 :
1262 0 : static void Luv32toRGB(LogLuvState *sp, uint8_t *op, tmsize_t n)
1263 : {
1264 0 : uint32_t *luv = (uint32_t *)sp->tbuf;
1265 0 : uint8_t *rgb = (uint8_t *)op;
1266 :
1267 0 : while (n-- > 0)
1268 : {
1269 : float xyz[3];
1270 :
1271 0 : LogLuv32toXYZ(*luv++, xyz);
1272 0 : XYZtoRGB24(xyz, rgb);
1273 0 : rgb += 3;
1274 : }
1275 0 : }
1276 :
1277 0 : static void Luv32fromXYZ(LogLuvState *sp, uint8_t *op, tmsize_t n)
1278 : {
1279 0 : uint32_t *luv = (uint32_t *)sp->tbuf;
1280 0 : float *xyz = (float *)op;
1281 :
1282 0 : while (n-- > 0)
1283 : {
1284 0 : *luv++ = LogLuv32fromXYZ(xyz, sp->encode_meth);
1285 0 : xyz += 3;
1286 : }
1287 0 : }
1288 :
1289 0 : static void Luv32fromLuv48(LogLuvState *sp, uint8_t *op, tmsize_t n)
1290 : {
1291 0 : uint32_t *luv = (uint32_t *)sp->tbuf;
1292 0 : int16_t *luv3 = (int16_t *)op;
1293 :
1294 0 : if (sp->encode_meth == SGILOGENCODE_NODITHER)
1295 : {
1296 0 : while (n-- > 0)
1297 : {
1298 0 : *luv++ =
1299 0 : (uint32_t)luv3[0] << 16 |
1300 0 : ((uint32_t)luv3[1] * (uint32_t)(UVSCALE + .5) >> 7 & 0xff00) |
1301 0 : ((uint32_t)luv3[2] * (uint32_t)(UVSCALE + .5) >> 15 & 0xff);
1302 0 : luv3 += 3;
1303 : }
1304 0 : return;
1305 : }
1306 0 : while (n-- > 0)
1307 : {
1308 0 : *luv++ =
1309 0 : (uint32_t)luv3[0] << 16 |
1310 0 : (tiff_itrunc(luv3[1] * (UVSCALE / (1 << 15)), sp->encode_meth)
1311 0 : << 8 &
1312 0 : 0xff00) |
1313 0 : (tiff_itrunc(luv3[2] * (UVSCALE / (1 << 15)), sp->encode_meth) &
1314 : 0xff);
1315 0 : luv3 += 3;
1316 : }
1317 : }
1318 :
1319 20 : static void _logLuvNop(LogLuvState *sp, uint8_t *op, tmsize_t n)
1320 : {
1321 : (void)sp;
1322 : (void)op;
1323 : (void)n;
1324 20 : }
1325 :
1326 1 : static int LogL16GuessDataFmt(TIFFDirectory *td)
1327 : {
1328 : #define PACK(s, b, f) (((b) << 6) | ((s) << 3) | (f))
1329 1 : switch (
1330 1 : PACK(td->td_samplesperpixel, td->td_bitspersample, td->td_sampleformat))
1331 : {
1332 0 : case PACK(1, 32, SAMPLEFORMAT_IEEEFP):
1333 0 : return (SGILOGDATAFMT_FLOAT);
1334 1 : case PACK(1, 16, SAMPLEFORMAT_VOID):
1335 : case PACK(1, 16, SAMPLEFORMAT_INT):
1336 : case PACK(1, 16, SAMPLEFORMAT_UINT):
1337 1 : return (SGILOGDATAFMT_16BIT);
1338 0 : case PACK(1, 8, SAMPLEFORMAT_VOID):
1339 : case PACK(1, 8, SAMPLEFORMAT_UINT):
1340 0 : return (SGILOGDATAFMT_8BIT);
1341 0 : default:
1342 0 : break;
1343 : }
1344 : #undef PACK
1345 0 : return (SGILOGDATAFMT_UNKNOWN);
1346 : }
1347 :
1348 4 : static tmsize_t multiply_ms(tmsize_t m1, tmsize_t m2)
1349 : {
1350 4 : return _TIFFMultiplySSize(NULL, m1, m2, NULL);
1351 : }
1352 :
1353 2 : static int LogL16InitState(TIFF *tif)
1354 : {
1355 : static const char module[] = "LogL16InitState";
1356 2 : TIFFDirectory *td = &tif->tif_dir;
1357 2 : LogLuvState *sp = DecoderState(tif);
1358 :
1359 2 : assert(sp != NULL);
1360 2 : assert(td->td_photometric == PHOTOMETRIC_LOGL);
1361 :
1362 2 : if (td->td_samplesperpixel != 1)
1363 : {
1364 0 : TIFFErrorExtR(tif, module,
1365 : "Sorry, can not handle LogL image with %s=%" PRIu16,
1366 0 : "Samples/pixel", td->td_samplesperpixel);
1367 0 : return 0;
1368 : }
1369 :
1370 : /* for some reason, we can't do this in TIFFInitLogL16 */
1371 2 : if (sp->user_datafmt == SGILOGDATAFMT_UNKNOWN)
1372 1 : sp->user_datafmt = LogL16GuessDataFmt(td);
1373 2 : switch (sp->user_datafmt)
1374 : {
1375 0 : case SGILOGDATAFMT_FLOAT:
1376 0 : sp->pixel_size = sizeof(float);
1377 0 : break;
1378 1 : case SGILOGDATAFMT_16BIT:
1379 1 : sp->pixel_size = sizeof(int16_t);
1380 1 : break;
1381 1 : case SGILOGDATAFMT_8BIT:
1382 1 : sp->pixel_size = sizeof(uint8_t);
1383 1 : break;
1384 0 : default:
1385 0 : TIFFErrorExtR(tif, module,
1386 : "No support for converting user data format to LogL");
1387 0 : return (0);
1388 : }
1389 2 : if (isTiled(tif))
1390 0 : sp->tbuflen = multiply_ms(td->td_tilewidth, td->td_tilelength);
1391 2 : else if (td->td_rowsperstrip < td->td_imagelength)
1392 0 : sp->tbuflen = multiply_ms(td->td_imagewidth, td->td_rowsperstrip);
1393 : else
1394 2 : sp->tbuflen = multiply_ms(td->td_imagewidth, td->td_imagelength);
1395 2 : if (multiply_ms(sp->tbuflen, sizeof(int16_t)) == 0 ||
1396 2 : (sp->tbuf = (uint8_t *)_TIFFmallocExt(
1397 2 : tif, (tmsize_t)((size_t)sp->tbuflen * sizeof(int16_t)))) == NULL)
1398 : {
1399 0 : TIFFErrorExtR(tif, module, "No space for SGILog translation buffer");
1400 0 : return (0);
1401 : }
1402 2 : return (1);
1403 : }
1404 :
1405 0 : static int LogLuvGuessDataFmt(TIFFDirectory *td)
1406 : {
1407 : int guess;
1408 :
1409 : /*
1410 : * If the user didn't tell us their datafmt,
1411 : * take our best guess from the bitspersample.
1412 : */
1413 : #define PACK(a, b) (((a) << 3) | (b))
1414 0 : switch (PACK(td->td_bitspersample, td->td_sampleformat))
1415 : {
1416 0 : case PACK(32, SAMPLEFORMAT_IEEEFP):
1417 0 : guess = SGILOGDATAFMT_FLOAT;
1418 0 : break;
1419 0 : case PACK(32, SAMPLEFORMAT_VOID):
1420 : case PACK(32, SAMPLEFORMAT_UINT):
1421 : case PACK(32, SAMPLEFORMAT_INT):
1422 0 : guess = SGILOGDATAFMT_RAW;
1423 0 : break;
1424 0 : case PACK(16, SAMPLEFORMAT_VOID):
1425 : case PACK(16, SAMPLEFORMAT_INT):
1426 : case PACK(16, SAMPLEFORMAT_UINT):
1427 0 : guess = SGILOGDATAFMT_16BIT;
1428 0 : break;
1429 0 : case PACK(8, SAMPLEFORMAT_VOID):
1430 : case PACK(8, SAMPLEFORMAT_UINT):
1431 0 : guess = SGILOGDATAFMT_8BIT;
1432 0 : break;
1433 0 : default:
1434 0 : guess = SGILOGDATAFMT_UNKNOWN;
1435 0 : break;
1436 : #undef PACK
1437 : }
1438 : /*
1439 : * Double-check samples per pixel.
1440 : */
1441 0 : switch (td->td_samplesperpixel)
1442 : {
1443 0 : case 1:
1444 0 : if (guess != SGILOGDATAFMT_RAW)
1445 0 : guess = SGILOGDATAFMT_UNKNOWN;
1446 0 : break;
1447 0 : case 3:
1448 0 : if (guess == SGILOGDATAFMT_RAW)
1449 0 : guess = SGILOGDATAFMT_UNKNOWN;
1450 0 : break;
1451 0 : default:
1452 0 : guess = SGILOGDATAFMT_UNKNOWN;
1453 0 : break;
1454 : }
1455 0 : return (guess);
1456 : }
1457 :
1458 0 : static int LogLuvInitState(TIFF *tif)
1459 : {
1460 : static const char module[] = "LogLuvInitState";
1461 0 : TIFFDirectory *td = &tif->tif_dir;
1462 0 : LogLuvState *sp = DecoderState(tif);
1463 :
1464 0 : assert(sp != NULL);
1465 0 : assert(td->td_photometric == PHOTOMETRIC_LOGLUV);
1466 :
1467 : /* for some reason, we can't do this in TIFFInitLogLuv */
1468 0 : if (td->td_planarconfig != PLANARCONFIG_CONTIG)
1469 : {
1470 0 : TIFFErrorExtR(tif, module,
1471 : "SGILog compression cannot handle non-contiguous data");
1472 0 : return (0);
1473 : }
1474 0 : if (sp->user_datafmt == SGILOGDATAFMT_UNKNOWN)
1475 0 : sp->user_datafmt = LogLuvGuessDataFmt(td);
1476 0 : switch (sp->user_datafmt)
1477 : {
1478 0 : case SGILOGDATAFMT_FLOAT:
1479 0 : sp->pixel_size = 3 * sizeof(float);
1480 0 : break;
1481 0 : case SGILOGDATAFMT_16BIT:
1482 0 : sp->pixel_size = 3 * sizeof(int16_t);
1483 0 : break;
1484 0 : case SGILOGDATAFMT_RAW:
1485 0 : sp->pixel_size = sizeof(uint32_t);
1486 0 : break;
1487 0 : case SGILOGDATAFMT_8BIT:
1488 0 : sp->pixel_size = 3 * sizeof(uint8_t);
1489 0 : break;
1490 0 : default:
1491 0 : TIFFErrorExtR(
1492 : tif, module,
1493 : "No support for converting user data format to LogLuv");
1494 0 : return (0);
1495 : }
1496 0 : if (isTiled(tif))
1497 0 : sp->tbuflen = multiply_ms(td->td_tilewidth, td->td_tilelength);
1498 0 : else if (td->td_rowsperstrip < td->td_imagelength)
1499 0 : sp->tbuflen = multiply_ms(td->td_imagewidth, td->td_rowsperstrip);
1500 : else
1501 0 : sp->tbuflen = multiply_ms(td->td_imagewidth, td->td_imagelength);
1502 0 : if (multiply_ms(sp->tbuflen, sizeof(uint32_t)) == 0 ||
1503 0 : (sp->tbuf = (uint8_t *)_TIFFmallocExt(
1504 0 : tif, (tmsize_t)((size_t)sp->tbuflen * sizeof(uint32_t)))) == NULL)
1505 : {
1506 0 : TIFFErrorExtR(tif, module, "No space for SGILog translation buffer");
1507 0 : return (0);
1508 : }
1509 0 : return (1);
1510 : }
1511 :
1512 3 : static int LogLuvFixupTags(TIFF *tif)
1513 : {
1514 : (void)tif;
1515 3 : return (1);
1516 : }
1517 :
1518 2 : static int LogLuvSetupDecode(TIFF *tif)
1519 : {
1520 : static const char module[] = "LogLuvSetupDecode";
1521 2 : LogLuvState *sp = DecoderState(tif);
1522 2 : TIFFDirectory *td = &tif->tif_dir;
1523 :
1524 2 : tif->tif_postdecode = _TIFFNoPostDecode;
1525 2 : switch (td->td_photometric)
1526 : {
1527 0 : case PHOTOMETRIC_LOGLUV:
1528 0 : if (!LogLuvInitState(tif))
1529 0 : break;
1530 0 : if (td->td_compression == COMPRESSION_SGILOG24)
1531 : {
1532 0 : tif->tif_decoderow = LogLuvDecode24;
1533 0 : switch (sp->user_datafmt)
1534 : {
1535 0 : case SGILOGDATAFMT_FLOAT:
1536 0 : sp->tfunc = Luv24toXYZ;
1537 0 : break;
1538 0 : case SGILOGDATAFMT_16BIT:
1539 0 : sp->tfunc = Luv24toLuv48;
1540 0 : break;
1541 0 : case SGILOGDATAFMT_8BIT:
1542 0 : sp->tfunc = Luv24toRGB;
1543 0 : break;
1544 0 : default:
1545 0 : break;
1546 : }
1547 : }
1548 : else
1549 : {
1550 0 : tif->tif_decoderow = LogLuvDecode32;
1551 0 : switch (sp->user_datafmt)
1552 : {
1553 0 : case SGILOGDATAFMT_FLOAT:
1554 0 : sp->tfunc = Luv32toXYZ;
1555 0 : break;
1556 0 : case SGILOGDATAFMT_16BIT:
1557 0 : sp->tfunc = Luv32toLuv48;
1558 0 : break;
1559 0 : case SGILOGDATAFMT_8BIT:
1560 0 : sp->tfunc = Luv32toRGB;
1561 0 : break;
1562 0 : default:
1563 0 : break;
1564 : }
1565 : }
1566 0 : return (1);
1567 2 : case PHOTOMETRIC_LOGL:
1568 2 : if (!LogL16InitState(tif))
1569 0 : break;
1570 2 : tif->tif_decoderow = LogL16Decode;
1571 2 : switch (sp->user_datafmt)
1572 : {
1573 0 : case SGILOGDATAFMT_FLOAT:
1574 0 : sp->tfunc = L16toY;
1575 0 : break;
1576 1 : case SGILOGDATAFMT_8BIT:
1577 1 : sp->tfunc = L16toGry;
1578 1 : break;
1579 1 : default:
1580 1 : break;
1581 : }
1582 2 : return (1);
1583 0 : default:
1584 0 : TIFFErrorExtR(tif, module,
1585 : "Inappropriate photometric interpretation %" PRIu16
1586 : " for SGILog compression; %s",
1587 0 : td->td_photometric, "must be either LogLUV or LogL");
1588 0 : break;
1589 : }
1590 0 : return (0);
1591 : }
1592 :
1593 0 : static int LogLuvSetupEncode(TIFF *tif)
1594 : {
1595 : static const char module[] = "LogLuvSetupEncode";
1596 0 : LogLuvState *sp = EncoderState(tif);
1597 0 : TIFFDirectory *td = &tif->tif_dir;
1598 :
1599 0 : switch (td->td_photometric)
1600 : {
1601 0 : case PHOTOMETRIC_LOGLUV:
1602 0 : if (!LogLuvInitState(tif))
1603 0 : return (0);
1604 0 : if (td->td_compression == COMPRESSION_SGILOG24)
1605 : {
1606 0 : tif->tif_encoderow = LogLuvEncode24;
1607 0 : switch (sp->user_datafmt)
1608 : {
1609 0 : case SGILOGDATAFMT_FLOAT:
1610 0 : sp->tfunc = Luv24fromXYZ;
1611 0 : break;
1612 0 : case SGILOGDATAFMT_16BIT:
1613 0 : sp->tfunc = Luv24fromLuv48;
1614 0 : break;
1615 0 : case SGILOGDATAFMT_RAW:
1616 0 : break;
1617 0 : default:
1618 0 : goto notsupported;
1619 : }
1620 : }
1621 : else
1622 : {
1623 0 : tif->tif_encoderow = LogLuvEncode32;
1624 0 : switch (sp->user_datafmt)
1625 : {
1626 0 : case SGILOGDATAFMT_FLOAT:
1627 0 : sp->tfunc = Luv32fromXYZ;
1628 0 : break;
1629 0 : case SGILOGDATAFMT_16BIT:
1630 0 : sp->tfunc = Luv32fromLuv48;
1631 0 : break;
1632 0 : case SGILOGDATAFMT_RAW:
1633 0 : break;
1634 0 : default:
1635 0 : goto notsupported;
1636 : }
1637 : }
1638 0 : break;
1639 0 : case PHOTOMETRIC_LOGL:
1640 0 : if (!LogL16InitState(tif))
1641 0 : return (0);
1642 0 : tif->tif_encoderow = LogL16Encode;
1643 0 : switch (sp->user_datafmt)
1644 : {
1645 0 : case SGILOGDATAFMT_FLOAT:
1646 0 : sp->tfunc = L16fromY;
1647 0 : break;
1648 0 : case SGILOGDATAFMT_16BIT:
1649 0 : break;
1650 0 : default:
1651 0 : goto notsupported;
1652 : }
1653 0 : break;
1654 0 : default:
1655 0 : TIFFErrorExtR(tif, module,
1656 : "Inappropriate photometric interpretation %" PRIu16
1657 : " for SGILog compression; %s",
1658 0 : td->td_photometric, "must be either LogLUV or LogL");
1659 0 : return (0);
1660 : }
1661 0 : sp->encoder_state = 1;
1662 0 : return (1);
1663 0 : notsupported:
1664 0 : TIFFErrorExtR(tif, module,
1665 : "SGILog compression supported only for %s, or raw data",
1666 0 : td->td_photometric == PHOTOMETRIC_LOGL ? "Y, L" : "XYZ, Luv");
1667 0 : return (0);
1668 : }
1669 :
1670 0 : static void LogLuvClose(TIFF *tif)
1671 : {
1672 0 : LogLuvState *sp = (LogLuvState *)tif->tif_data;
1673 0 : TIFFDirectory *td = &tif->tif_dir;
1674 :
1675 0 : assert(sp != 0);
1676 : /*
1677 : * For consistency, we always want to write out the same
1678 : * bitspersample and sampleformat for our TIFF file,
1679 : * regardless of the data format being used by the application.
1680 : * Since this routine is called after tags have been set but
1681 : * before they have been recorded in the file, we reset them here.
1682 : * Note: this is really a nasty approach. See PixarLogClose
1683 : */
1684 0 : if (sp->encoder_state)
1685 : {
1686 : /* See PixarLogClose. Might avoid issues with tags whose size depends
1687 : * on those below, but not completely sure this is enough. */
1688 0 : td->td_samplesperpixel =
1689 0 : (td->td_photometric == PHOTOMETRIC_LOGL) ? 1 : 3;
1690 0 : td->td_bitspersample = 16;
1691 0 : td->td_sampleformat = SAMPLEFORMAT_INT;
1692 : }
1693 0 : }
1694 :
1695 3 : static void LogLuvCleanup(TIFF *tif)
1696 : {
1697 3 : LogLuvState *sp = (LogLuvState *)tif->tif_data;
1698 :
1699 3 : assert(sp != 0);
1700 :
1701 3 : tif->tif_tagmethods.vgetfield = sp->vgetparent;
1702 3 : tif->tif_tagmethods.vsetfield = sp->vsetparent;
1703 :
1704 3 : if (sp->tbuf)
1705 2 : _TIFFfreeExt(tif, sp->tbuf);
1706 3 : _TIFFfreeExt(tif, sp);
1707 3 : tif->tif_data = NULL;
1708 :
1709 3 : _TIFFSetDefaultCompressionState(tif);
1710 3 : }
1711 :
1712 27 : static int LogLuvVSetField(TIFF *tif, uint32_t tag, va_list ap)
1713 : {
1714 : static const char module[] = "LogLuvVSetField";
1715 27 : LogLuvState *sp = DecoderState(tif);
1716 : int bps, fmt;
1717 :
1718 27 : switch (tag)
1719 : {
1720 1 : case TIFFTAG_SGILOGDATAFMT:
1721 1 : sp->user_datafmt = (int)va_arg(ap, int);
1722 : /*
1723 : * Tweak the TIFF header so that the rest of libtiff knows what
1724 : * size of data will be passed between app and library, and
1725 : * assume that the app knows what it is doing and is not
1726 : * confused by these header manipulations...
1727 : */
1728 1 : switch (sp->user_datafmt)
1729 : {
1730 0 : case SGILOGDATAFMT_FLOAT:
1731 0 : bps = 32;
1732 0 : fmt = SAMPLEFORMAT_IEEEFP;
1733 0 : break;
1734 0 : case SGILOGDATAFMT_16BIT:
1735 0 : bps = 16;
1736 0 : fmt = SAMPLEFORMAT_INT;
1737 0 : break;
1738 0 : case SGILOGDATAFMT_RAW:
1739 0 : bps = 32;
1740 0 : fmt = SAMPLEFORMAT_UINT;
1741 0 : TIFFSetField(tif, TIFFTAG_SAMPLESPERPIXEL, 1);
1742 0 : break;
1743 1 : case SGILOGDATAFMT_8BIT:
1744 1 : bps = 8;
1745 1 : fmt = SAMPLEFORMAT_UINT;
1746 1 : break;
1747 0 : default:
1748 0 : TIFFErrorExtR(
1749 0 : tif, tif->tif_name,
1750 : "Unknown data format %d for LogLuv compression",
1751 : sp->user_datafmt);
1752 0 : return (0);
1753 : }
1754 1 : TIFFSetField(tif, TIFFTAG_BITSPERSAMPLE, bps);
1755 1 : TIFFSetField(tif, TIFFTAG_SAMPLEFORMAT, fmt);
1756 : /*
1757 : * Must recalculate sizes should bits/sample change.
1758 : */
1759 1 : tif->tif_dir.td_tilesize =
1760 1 : isTiled(tif) ? TIFFTileSize(tif) : (tmsize_t)-1;
1761 1 : tif->tif_dir.td_scanlinesize = TIFFScanlineSize(tif);
1762 1 : return (1);
1763 0 : case TIFFTAG_SGILOGENCODE:
1764 0 : sp->encode_meth = (int)va_arg(ap, int);
1765 0 : if (sp->encode_meth != SGILOGENCODE_NODITHER &&
1766 0 : sp->encode_meth != SGILOGENCODE_RANDITHER)
1767 : {
1768 0 : TIFFErrorExtR(tif, module,
1769 : "Unknown encoding %d for LogLuv compression",
1770 : sp->encode_meth);
1771 0 : return (0);
1772 : }
1773 0 : return (1);
1774 26 : default:
1775 26 : return (*sp->vsetparent)(tif, tag, ap);
1776 : }
1777 : }
1778 :
1779 49 : static int LogLuvVGetField(TIFF *tif, uint32_t tag, va_list ap)
1780 : {
1781 49 : LogLuvState *sp = (LogLuvState *)tif->tif_data;
1782 :
1783 49 : switch (tag)
1784 : {
1785 0 : case TIFFTAG_SGILOGDATAFMT:
1786 0 : *va_arg(ap, int *) = sp->user_datafmt;
1787 0 : return (1);
1788 49 : default:
1789 49 : return (*sp->vgetparent)(tif, tag, ap);
1790 : }
1791 : }
1792 :
1793 : static const TIFFField LogLuvFields[] = {
1794 : {TIFFTAG_SGILOGDATAFMT, 0, 0, TIFF_SHORT, 0, TIFF_SETGET_INT, FIELD_PSEUDO,
1795 : TRUE, FALSE, "SGILogDataFmt", NULL},
1796 : {TIFFTAG_SGILOGENCODE, 0, 0, TIFF_SHORT, 0, TIFF_SETGET_INT, FIELD_PSEUDO,
1797 : TRUE, FALSE, "SGILogEncode", NULL}};
1798 :
1799 3 : int TIFFInitSGILog(TIFF *tif, int scheme)
1800 : {
1801 : static const char module[] = "TIFFInitSGILog";
1802 : LogLuvState *sp;
1803 :
1804 3 : assert(scheme == COMPRESSION_SGILOG24 || scheme == COMPRESSION_SGILOG);
1805 :
1806 : /*
1807 : * Merge codec-specific tag information.
1808 : */
1809 3 : if (!_TIFFMergeFields(tif, LogLuvFields, TIFFArrayCount(LogLuvFields)))
1810 : {
1811 0 : TIFFErrorExtR(tif, module, "Merging SGILog codec-specific tags failed");
1812 0 : return 0;
1813 : }
1814 :
1815 : /*
1816 : * Allocate state block so tag methods have storage to record values.
1817 : */
1818 3 : tif->tif_data = (uint8_t *)_TIFFmallocExt(tif, sizeof(LogLuvState));
1819 3 : if (tif->tif_data == NULL)
1820 0 : goto bad;
1821 3 : sp = (LogLuvState *)tif->tif_data;
1822 3 : _TIFFmemset((void *)sp, 0, sizeof(*sp));
1823 3 : sp->user_datafmt = SGILOGDATAFMT_UNKNOWN;
1824 3 : sp->encode_meth = (scheme == COMPRESSION_SGILOG24) ? SGILOGENCODE_RANDITHER
1825 3 : : SGILOGENCODE_NODITHER;
1826 3 : sp->tfunc = _logLuvNop;
1827 :
1828 : /*
1829 : * Install codec methods.
1830 : * NB: tif_decoderow & tif_encoderow are filled
1831 : * in at setup time.
1832 : */
1833 3 : tif->tif_fixuptags = LogLuvFixupTags;
1834 3 : tif->tif_setupdecode = LogLuvSetupDecode;
1835 3 : tif->tif_decodestrip = LogLuvDecodeStrip;
1836 3 : tif->tif_decodetile = LogLuvDecodeTile;
1837 3 : tif->tif_setupencode = LogLuvSetupEncode;
1838 3 : tif->tif_encodestrip = LogLuvEncodeStrip;
1839 3 : tif->tif_encodetile = LogLuvEncodeTile;
1840 3 : tif->tif_close = LogLuvClose;
1841 3 : tif->tif_cleanup = LogLuvCleanup;
1842 :
1843 : /*
1844 : * Override parent get/set field methods.
1845 : */
1846 3 : sp->vgetparent = tif->tif_tagmethods.vgetfield;
1847 3 : tif->tif_tagmethods.vgetfield = LogLuvVGetField; /* hook for codec tags */
1848 3 : sp->vsetparent = tif->tif_tagmethods.vsetfield;
1849 3 : tif->tif_tagmethods.vsetfield = LogLuvVSetField; /* hook for codec tags */
1850 :
1851 3 : return (1);
1852 0 : bad:
1853 0 : TIFFErrorExtR(tif, module, "%s: No space for LogLuv state block",
1854 : tif->tif_name);
1855 0 : return (0);
1856 : }
1857 : #endif /* LOGLUV_SUPPORT */
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