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, 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_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] = bp[0] << 16 | 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_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, 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_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 : #undef log2 /* Conflict with C'99 function */
771 : #define log2(x) ((1. / M_LN2) * log(x))
772 : #undef exp2 /* Conflict with C'99 function */
773 : #define exp2(x) exp(M_LN2 *(x))
774 :
775 : #define TIFF_RAND_MAX 32767
776 :
777 : // From POSIX.1-2001 as an example of an implementation of rand()
778 0 : static uint32_t _TIFFRand()
779 : {
780 : static uint32_t nCounter = 0;
781 0 : if (!nCounter)
782 0 : nCounter = (uint32_t)(time(NULL) & UINT32_MAX);
783 0 : ++nCounter;
784 0 : uint32_t nCounterLocal =
785 0 : (uint32_t)(((uint64_t)(nCounter)*1103515245U + 12345U) & UINT32_MAX);
786 0 : nCounter = nCounterLocal;
787 0 : return (nCounterLocal / 65536U) % (TIFF_RAND_MAX + 1);
788 : };
789 :
790 0 : static int tiff_itrunc(double x, int m)
791 : {
792 0 : if (m == SGILOGENCODE_NODITHER)
793 0 : return (int)x;
794 0 : return (int)(x + _TIFFRand() * (1. / TIFF_RAND_MAX) - .5);
795 : }
796 :
797 : #if !LOGLUV_PUBLIC
798 : static
799 : #endif
800 : double
801 400 : LogL16toY(int p16) /* compute luminance from 16-bit LogL */
802 : {
803 400 : int Le = p16 & 0x7fff;
804 : double Y;
805 :
806 400 : if (!Le)
807 0 : return (0.);
808 400 : Y = exp(M_LN2 / 256. * (Le + .5) - M_LN2 * 64.);
809 400 : return (!(p16 & 0x8000) ? Y : -Y);
810 : }
811 :
812 : #if !LOGLUV_PUBLIC
813 : static
814 : #endif
815 : int
816 0 : LogL16fromY(double Y, int em) /* get 16-bit LogL from Y */
817 : {
818 0 : if (Y >= 1.8371976e19)
819 0 : return (0x7fff);
820 0 : if (Y <= -1.8371976e19)
821 0 : return (0xffff);
822 0 : if (Y > 5.4136769e-20)
823 0 : return tiff_itrunc(256. * (log2(Y) + 64.), em);
824 0 : if (Y < -5.4136769e-20)
825 0 : return (~0x7fff | tiff_itrunc(256. * (log2(-Y) + 64.), em));
826 0 : return (0);
827 : }
828 :
829 0 : static void L16toY(LogLuvState *sp, uint8_t *op, tmsize_t n)
830 : {
831 0 : int16_t *l16 = (int16_t *)sp->tbuf;
832 0 : float *yp = (float *)op;
833 :
834 0 : while (n-- > 0)
835 0 : *yp++ = (float)LogL16toY(*l16++);
836 0 : }
837 :
838 20 : static void L16toGry(LogLuvState *sp, uint8_t *op, tmsize_t n)
839 : {
840 20 : int16_t *l16 = (int16_t *)sp->tbuf;
841 20 : uint8_t *gp = (uint8_t *)op;
842 :
843 420 : while (n-- > 0)
844 : {
845 400 : double Y = LogL16toY(*l16++);
846 800 : *gp++ = (uint8_t)((Y <= 0.) ? 0
847 : : (Y >= 1.) ? 255
848 400 : : (int)(256. * sqrt(Y)));
849 : }
850 20 : }
851 :
852 0 : static void L16fromY(LogLuvState *sp, uint8_t *op, tmsize_t n)
853 : {
854 0 : int16_t *l16 = (int16_t *)sp->tbuf;
855 0 : float *yp = (float *)op;
856 :
857 0 : while (n-- > 0)
858 0 : *l16++ = (int16_t)(LogL16fromY(*yp++, sp->encode_meth));
859 0 : }
860 :
861 : #if !LOGLUV_PUBLIC
862 : static
863 : #endif
864 : void
865 0 : XYZtoRGB24(float *xyz, uint8_t *rgb)
866 : {
867 : double r, g, b;
868 : /* assume CCIR-709 primaries */
869 0 : r = 2.690 * xyz[0] + -1.276 * xyz[1] + -0.414 * xyz[2];
870 0 : g = -1.022 * xyz[0] + 1.978 * xyz[1] + 0.044 * xyz[2];
871 0 : b = 0.061 * xyz[0] + -0.224 * xyz[1] + 1.163 * xyz[2];
872 : /* assume 2.0 gamma for speed */
873 : /* could use integer sqrt approx., but this is probably faster */
874 0 : rgb[0] = (uint8_t)((r <= 0.) ? 0 : (r >= 1.) ? 255 : (int)(256. * sqrt(r)));
875 0 : rgb[1] = (uint8_t)((g <= 0.) ? 0 : (g >= 1.) ? 255 : (int)(256. * sqrt(g)));
876 0 : rgb[2] = (uint8_t)((b <= 0.) ? 0 : (b >= 1.) ? 255 : (int)(256. * sqrt(b)));
877 0 : }
878 :
879 : #if !LOGLUV_PUBLIC
880 : static
881 : #endif
882 : double
883 0 : LogL10toY(int p10) /* compute luminance from 10-bit LogL */
884 : {
885 0 : if (p10 == 0)
886 0 : return (0.);
887 0 : return (exp(M_LN2 / 64. * (p10 + .5) - M_LN2 * 12.));
888 : }
889 :
890 : #if !LOGLUV_PUBLIC
891 : static
892 : #endif
893 : int
894 0 : LogL10fromY(double Y, int em) /* get 10-bit LogL from Y */
895 : {
896 0 : if (Y >= 15.742)
897 0 : return (0x3ff);
898 0 : else if (Y <= .00024283)
899 0 : return (0);
900 : else
901 0 : return tiff_itrunc(64. * (log2(Y) + 12.), em);
902 : }
903 :
904 : #define NANGLES 100
905 : #define uv2ang(u, v) \
906 : ((NANGLES * .499999999 / M_PI) * atan2((v)-V_NEU, (u)-U_NEU) + .5 * NANGLES)
907 :
908 0 : static int oog_encode(double u, double v) /* encode out-of-gamut chroma */
909 : {
910 : static int oog_table[NANGLES];
911 : static int initialized = 0;
912 : register int i;
913 :
914 0 : if (!initialized)
915 : { /* set up perimeter table */
916 : double eps[NANGLES], ua, va, ang, epsa;
917 : int ui, vi, ustep;
918 0 : for (i = NANGLES; i--;)
919 0 : eps[i] = 2.;
920 0 : for (vi = UV_NVS; vi--;)
921 : {
922 0 : va = UV_VSTART + (vi + .5) * UV_SQSIZ;
923 0 : ustep = uv_row[vi].nus - 1;
924 0 : if (vi == UV_NVS - 1 || vi == 0 || ustep <= 0)
925 0 : ustep = 1;
926 0 : for (ui = uv_row[vi].nus - 1; ui >= 0; ui -= ustep)
927 : {
928 0 : ua = uv_row[vi].ustart + (ui + .5) * UV_SQSIZ;
929 0 : ang = uv2ang(ua, va);
930 0 : i = (int)ang;
931 0 : epsa = fabs(ang - (i + .5));
932 0 : if (epsa < eps[i])
933 : {
934 0 : oog_table[i] = uv_row[vi].ncum + ui;
935 0 : eps[i] = epsa;
936 : }
937 : }
938 : }
939 0 : for (i = NANGLES; i--;) /* fill any holes */
940 0 : if (eps[i] > 1.5)
941 : {
942 : int i1, i2;
943 0 : for (i1 = 1; i1 < NANGLES / 2; i1++)
944 0 : if (eps[(i + i1) % NANGLES] < 1.5)
945 0 : break;
946 0 : for (i2 = 1; i2 < NANGLES / 2; i2++)
947 0 : if (eps[(i + NANGLES - i2) % NANGLES] < 1.5)
948 0 : break;
949 0 : if (i1 < i2)
950 0 : oog_table[i] = oog_table[(i + i1) % NANGLES];
951 : else
952 0 : oog_table[i] = oog_table[(i + NANGLES - i2) % NANGLES];
953 : }
954 0 : initialized = 1;
955 : }
956 0 : i = (int)uv2ang(u, v); /* look up hue angle */
957 0 : return (oog_table[i]);
958 : }
959 :
960 : #undef uv2ang
961 : #undef NANGLES
962 :
963 : #if !LOGLUV_PUBLIC
964 : static
965 : #endif
966 : int
967 0 : uv_encode(double u, double v, int em) /* encode (u',v') coordinates */
968 : {
969 : unsigned int vi;
970 : int ui;
971 :
972 : /* check for NaN */
973 0 : if (u != u || v != v)
974 : {
975 0 : u = U_NEU;
976 0 : v = V_NEU;
977 : }
978 :
979 0 : if (v < UV_VSTART)
980 0 : return oog_encode(u, v);
981 0 : vi = tiff_itrunc((v - UV_VSTART) * (1. / UV_SQSIZ), em);
982 0 : if (vi >= UV_NVS)
983 0 : return oog_encode(u, v);
984 0 : if (u < uv_row[vi].ustart)
985 0 : return oog_encode(u, v);
986 0 : ui = tiff_itrunc((u - uv_row[vi].ustart) * (1. / UV_SQSIZ), em);
987 0 : if (ui >= uv_row[vi].nus)
988 0 : return oog_encode(u, v);
989 :
990 0 : return (uv_row[vi].ncum + ui);
991 : }
992 :
993 : #if !LOGLUV_PUBLIC
994 : static
995 : #endif
996 : int
997 0 : uv_decode(double *up, double *vp, int c) /* decode (u',v') index */
998 : {
999 : unsigned int upper, lower;
1000 : int ui;
1001 : unsigned int vi;
1002 :
1003 0 : if (c < 0 || c >= UV_NDIVS)
1004 0 : return (-1);
1005 0 : lower = 0; /* binary search */
1006 0 : upper = UV_NVS;
1007 0 : while (upper - lower > 1)
1008 : {
1009 0 : vi = (lower + upper) >> 1;
1010 0 : ui = c - uv_row[vi].ncum;
1011 0 : if (ui > 0)
1012 0 : lower = vi;
1013 0 : else if (ui < 0)
1014 0 : upper = vi;
1015 : else
1016 : {
1017 0 : lower = vi;
1018 0 : break;
1019 : }
1020 : }
1021 0 : vi = lower;
1022 0 : ui = c - uv_row[vi].ncum;
1023 0 : *up = uv_row[vi].ustart + (ui + .5) * UV_SQSIZ;
1024 0 : *vp = UV_VSTART + (vi + .5) * UV_SQSIZ;
1025 0 : return (0);
1026 : }
1027 :
1028 : #if !LOGLUV_PUBLIC
1029 : static
1030 : #endif
1031 : void
1032 0 : LogLuv24toXYZ(uint32_t p, float *XYZ)
1033 : {
1034 : int Ce;
1035 : double L, u, v, s, x, y;
1036 : /* decode luminance */
1037 0 : L = LogL10toY(p >> 14 & 0x3ff);
1038 0 : if (L <= 0.)
1039 : {
1040 0 : XYZ[0] = XYZ[1] = XYZ[2] = 0.;
1041 0 : return;
1042 : }
1043 : /* decode color */
1044 0 : Ce = p & 0x3fff;
1045 0 : if (uv_decode(&u, &v, Ce) < 0)
1046 : {
1047 0 : u = U_NEU;
1048 0 : v = V_NEU;
1049 : }
1050 0 : s = 1. / (6. * u - 16. * v + 12.);
1051 0 : x = 9. * u * s;
1052 0 : y = 4. * v * s;
1053 : /* convert to XYZ */
1054 0 : XYZ[0] = (float)(x / y * L);
1055 0 : XYZ[1] = (float)L;
1056 0 : XYZ[2] = (float)((1. - x - y) / y * L);
1057 : }
1058 :
1059 : #if !LOGLUV_PUBLIC
1060 : static
1061 : #endif
1062 : uint32_t
1063 0 : LogLuv24fromXYZ(float *XYZ, int em)
1064 : {
1065 : int Le, Ce;
1066 : double u, v, s;
1067 : /* encode luminance */
1068 0 : Le = LogL10fromY(XYZ[1], em);
1069 : /* encode color */
1070 0 : s = XYZ[0] + 15. * XYZ[1] + 3. * XYZ[2];
1071 0 : if (!Le || s <= 0.)
1072 : {
1073 0 : u = U_NEU;
1074 0 : v = V_NEU;
1075 : }
1076 : else
1077 : {
1078 0 : u = 4. * XYZ[0] / s;
1079 0 : v = 9. * XYZ[1] / s;
1080 : }
1081 0 : Ce = uv_encode(u, v, em);
1082 0 : if (Ce < 0) /* never happens */
1083 0 : Ce = uv_encode(U_NEU, V_NEU, SGILOGENCODE_NODITHER);
1084 : /* combine encodings */
1085 0 : return (Le << 14 | Ce);
1086 : }
1087 :
1088 0 : static void Luv24toXYZ(LogLuvState *sp, uint8_t *op, tmsize_t n)
1089 : {
1090 0 : uint32_t *luv = (uint32_t *)sp->tbuf;
1091 0 : float *xyz = (float *)op;
1092 :
1093 0 : while (n-- > 0)
1094 : {
1095 0 : LogLuv24toXYZ(*luv, xyz);
1096 0 : xyz += 3;
1097 0 : luv++;
1098 : }
1099 0 : }
1100 :
1101 0 : static void Luv24toLuv48(LogLuvState *sp, uint8_t *op, tmsize_t n)
1102 : {
1103 0 : uint32_t *luv = (uint32_t *)sp->tbuf;
1104 0 : int16_t *luv3 = (int16_t *)op;
1105 :
1106 0 : while (n-- > 0)
1107 : {
1108 : double u, v;
1109 :
1110 0 : *luv3++ = (int16_t)((*luv >> 12 & 0xffd) + 13314);
1111 0 : if (uv_decode(&u, &v, *luv & 0x3fff) < 0)
1112 : {
1113 0 : u = U_NEU;
1114 0 : v = V_NEU;
1115 : }
1116 0 : *luv3++ = (int16_t)(u * (1L << 15));
1117 0 : *luv3++ = (int16_t)(v * (1L << 15));
1118 0 : luv++;
1119 : }
1120 0 : }
1121 :
1122 0 : static void Luv24toRGB(LogLuvState *sp, uint8_t *op, tmsize_t n)
1123 : {
1124 0 : uint32_t *luv = (uint32_t *)sp->tbuf;
1125 0 : uint8_t *rgb = (uint8_t *)op;
1126 :
1127 0 : while (n-- > 0)
1128 : {
1129 : float xyz[3];
1130 :
1131 0 : LogLuv24toXYZ(*luv++, xyz);
1132 0 : XYZtoRGB24(xyz, rgb);
1133 0 : rgb += 3;
1134 : }
1135 0 : }
1136 :
1137 0 : static void Luv24fromXYZ(LogLuvState *sp, uint8_t *op, tmsize_t n)
1138 : {
1139 0 : uint32_t *luv = (uint32_t *)sp->tbuf;
1140 0 : float *xyz = (float *)op;
1141 :
1142 0 : while (n-- > 0)
1143 : {
1144 0 : *luv++ = LogLuv24fromXYZ(xyz, sp->encode_meth);
1145 0 : xyz += 3;
1146 : }
1147 0 : }
1148 :
1149 0 : static void Luv24fromLuv48(LogLuvState *sp, uint8_t *op, tmsize_t n)
1150 : {
1151 0 : uint32_t *luv = (uint32_t *)sp->tbuf;
1152 0 : int16_t *luv3 = (int16_t *)op;
1153 :
1154 0 : while (n-- > 0)
1155 : {
1156 : int Le, Ce;
1157 :
1158 0 : if (luv3[0] <= 0)
1159 0 : Le = 0;
1160 0 : else if (luv3[0] >= (1 << 12) + 3314)
1161 0 : Le = (1 << 10) - 1;
1162 0 : else if (sp->encode_meth == SGILOGENCODE_NODITHER)
1163 0 : Le = (luv3[0] - 3314) >> 2;
1164 : else
1165 0 : Le = tiff_itrunc(.25 * (luv3[0] - 3314.), sp->encode_meth);
1166 :
1167 0 : Ce = uv_encode((luv3[1] + .5) / (1 << 15), (luv3[2] + .5) / (1 << 15),
1168 : sp->encode_meth);
1169 0 : if (Ce < 0) /* never happens */
1170 0 : Ce = uv_encode(U_NEU, V_NEU, SGILOGENCODE_NODITHER);
1171 0 : *luv++ = (uint32_t)Le << 14 | Ce;
1172 0 : luv3 += 3;
1173 : }
1174 0 : }
1175 :
1176 : #if !LOGLUV_PUBLIC
1177 : static
1178 : #endif
1179 : void
1180 0 : LogLuv32toXYZ(uint32_t p, float *XYZ)
1181 : {
1182 : double L, u, v, s, x, y;
1183 : /* decode luminance */
1184 0 : L = LogL16toY((int)p >> 16);
1185 0 : if (L <= 0.)
1186 : {
1187 0 : XYZ[0] = XYZ[1] = XYZ[2] = 0.;
1188 0 : return;
1189 : }
1190 : /* decode color */
1191 0 : u = 1. / UVSCALE * ((p >> 8 & 0xff) + .5);
1192 0 : v = 1. / UVSCALE * ((p & 0xff) + .5);
1193 0 : s = 1. / (6. * u - 16. * v + 12.);
1194 0 : x = 9. * u * s;
1195 0 : y = 4. * v * s;
1196 : /* convert to XYZ */
1197 0 : XYZ[0] = (float)(x / y * L);
1198 0 : XYZ[1] = (float)L;
1199 0 : XYZ[2] = (float)((1. - x - y) / y * L);
1200 : }
1201 :
1202 : #if !LOGLUV_PUBLIC
1203 : static
1204 : #endif
1205 : uint32_t
1206 0 : LogLuv32fromXYZ(float *XYZ, int em)
1207 : {
1208 : unsigned int Le, ue, ve;
1209 : double u, v, s;
1210 : /* encode luminance */
1211 0 : Le = (unsigned int)LogL16fromY(XYZ[1], em);
1212 : /* encode color */
1213 0 : s = XYZ[0] + 15. * XYZ[1] + 3. * XYZ[2];
1214 0 : if (!Le || s <= 0.)
1215 : {
1216 0 : u = U_NEU;
1217 0 : v = V_NEU;
1218 : }
1219 : else
1220 : {
1221 0 : u = 4. * XYZ[0] / s;
1222 0 : v = 9. * XYZ[1] / s;
1223 : }
1224 0 : if (u <= 0.)
1225 0 : ue = 0;
1226 : else
1227 0 : ue = tiff_itrunc(UVSCALE * u, em);
1228 0 : if (ue > 255)
1229 0 : ue = 255;
1230 0 : if (v <= 0.)
1231 0 : ve = 0;
1232 : else
1233 0 : ve = tiff_itrunc(UVSCALE * v, em);
1234 0 : if (ve > 255)
1235 0 : ve = 255;
1236 : /* combine encodings */
1237 0 : return (Le << 16 | ue << 8 | ve);
1238 : }
1239 :
1240 0 : static void Luv32toXYZ(LogLuvState *sp, uint8_t *op, tmsize_t n)
1241 : {
1242 0 : uint32_t *luv = (uint32_t *)sp->tbuf;
1243 0 : float *xyz = (float *)op;
1244 :
1245 0 : while (n-- > 0)
1246 : {
1247 0 : LogLuv32toXYZ(*luv++, xyz);
1248 0 : xyz += 3;
1249 : }
1250 0 : }
1251 :
1252 0 : static void Luv32toLuv48(LogLuvState *sp, uint8_t *op, tmsize_t n)
1253 : {
1254 0 : uint32_t *luv = (uint32_t *)sp->tbuf;
1255 0 : int16_t *luv3 = (int16_t *)op;
1256 :
1257 0 : while (n-- > 0)
1258 : {
1259 : double u, v;
1260 :
1261 0 : *luv3++ = (int16_t)(*luv >> 16);
1262 0 : u = 1. / UVSCALE * ((*luv >> 8 & 0xff) + .5);
1263 0 : v = 1. / UVSCALE * ((*luv & 0xff) + .5);
1264 0 : *luv3++ = (int16_t)(u * (1L << 15));
1265 0 : *luv3++ = (int16_t)(v * (1L << 15));
1266 0 : luv++;
1267 : }
1268 0 : }
1269 :
1270 0 : static void Luv32toRGB(LogLuvState *sp, uint8_t *op, tmsize_t n)
1271 : {
1272 0 : uint32_t *luv = (uint32_t *)sp->tbuf;
1273 0 : uint8_t *rgb = (uint8_t *)op;
1274 :
1275 0 : while (n-- > 0)
1276 : {
1277 : float xyz[3];
1278 :
1279 0 : LogLuv32toXYZ(*luv++, xyz);
1280 0 : XYZtoRGB24(xyz, rgb);
1281 0 : rgb += 3;
1282 : }
1283 0 : }
1284 :
1285 0 : static void Luv32fromXYZ(LogLuvState *sp, uint8_t *op, tmsize_t n)
1286 : {
1287 0 : uint32_t *luv = (uint32_t *)sp->tbuf;
1288 0 : float *xyz = (float *)op;
1289 :
1290 0 : while (n-- > 0)
1291 : {
1292 0 : *luv++ = LogLuv32fromXYZ(xyz, sp->encode_meth);
1293 0 : xyz += 3;
1294 : }
1295 0 : }
1296 :
1297 0 : static void Luv32fromLuv48(LogLuvState *sp, uint8_t *op, tmsize_t n)
1298 : {
1299 0 : uint32_t *luv = (uint32_t *)sp->tbuf;
1300 0 : int16_t *luv3 = (int16_t *)op;
1301 :
1302 0 : if (sp->encode_meth == SGILOGENCODE_NODITHER)
1303 : {
1304 0 : while (n-- > 0)
1305 : {
1306 0 : *luv++ = (uint32_t)luv3[0] << 16 |
1307 0 : (luv3[1] * (uint32_t)(UVSCALE + .5) >> 7 & 0xff00) |
1308 0 : (luv3[2] * (uint32_t)(UVSCALE + .5) >> 15 & 0xff);
1309 0 : luv3 += 3;
1310 : }
1311 0 : return;
1312 : }
1313 0 : while (n-- > 0)
1314 : {
1315 0 : *luv++ =
1316 0 : (uint32_t)luv3[0] << 16 |
1317 0 : (tiff_itrunc(luv3[1] * (UVSCALE / (1 << 15)), sp->encode_meth)
1318 0 : << 8 &
1319 0 : 0xff00) |
1320 0 : (tiff_itrunc(luv3[2] * (UVSCALE / (1 << 15)), sp->encode_meth) &
1321 : 0xff);
1322 0 : luv3 += 3;
1323 : }
1324 : }
1325 :
1326 20 : static void _logLuvNop(LogLuvState *sp, uint8_t *op, tmsize_t n)
1327 : {
1328 : (void)sp;
1329 : (void)op;
1330 : (void)n;
1331 20 : }
1332 :
1333 1 : static int LogL16GuessDataFmt(TIFFDirectory *td)
1334 : {
1335 : #define PACK(s, b, f) (((b) << 6) | ((s) << 3) | (f))
1336 1 : switch (
1337 1 : PACK(td->td_samplesperpixel, td->td_bitspersample, td->td_sampleformat))
1338 : {
1339 0 : case PACK(1, 32, SAMPLEFORMAT_IEEEFP):
1340 0 : return (SGILOGDATAFMT_FLOAT);
1341 1 : case PACK(1, 16, SAMPLEFORMAT_VOID):
1342 : case PACK(1, 16, SAMPLEFORMAT_INT):
1343 : case PACK(1, 16, SAMPLEFORMAT_UINT):
1344 1 : return (SGILOGDATAFMT_16BIT);
1345 0 : case PACK(1, 8, SAMPLEFORMAT_VOID):
1346 : case PACK(1, 8, SAMPLEFORMAT_UINT):
1347 0 : return (SGILOGDATAFMT_8BIT);
1348 : }
1349 : #undef PACK
1350 0 : return (SGILOGDATAFMT_UNKNOWN);
1351 : }
1352 :
1353 4 : static tmsize_t multiply_ms(tmsize_t m1, tmsize_t m2)
1354 : {
1355 4 : return _TIFFMultiplySSize(NULL, m1, m2, NULL);
1356 : }
1357 :
1358 2 : static int LogL16InitState(TIFF *tif)
1359 : {
1360 : static const char module[] = "LogL16InitState";
1361 2 : TIFFDirectory *td = &tif->tif_dir;
1362 2 : LogLuvState *sp = DecoderState(tif);
1363 :
1364 2 : assert(sp != NULL);
1365 2 : assert(td->td_photometric == PHOTOMETRIC_LOGL);
1366 :
1367 2 : if (td->td_samplesperpixel != 1)
1368 : {
1369 0 : TIFFErrorExtR(tif, module,
1370 : "Sorry, can not handle LogL image with %s=%" PRIu16,
1371 0 : "Samples/pixel", td->td_samplesperpixel);
1372 0 : return 0;
1373 : }
1374 :
1375 : /* for some reason, we can't do this in TIFFInitLogL16 */
1376 2 : if (sp->user_datafmt == SGILOGDATAFMT_UNKNOWN)
1377 1 : sp->user_datafmt = LogL16GuessDataFmt(td);
1378 2 : switch (sp->user_datafmt)
1379 : {
1380 0 : case SGILOGDATAFMT_FLOAT:
1381 0 : sp->pixel_size = sizeof(float);
1382 0 : break;
1383 1 : case SGILOGDATAFMT_16BIT:
1384 1 : sp->pixel_size = sizeof(int16_t);
1385 1 : break;
1386 1 : case SGILOGDATAFMT_8BIT:
1387 1 : sp->pixel_size = sizeof(uint8_t);
1388 1 : break;
1389 0 : default:
1390 0 : TIFFErrorExtR(tif, module,
1391 : "No support for converting user data format to LogL");
1392 0 : return (0);
1393 : }
1394 2 : if (isTiled(tif))
1395 0 : sp->tbuflen = multiply_ms(td->td_tilewidth, td->td_tilelength);
1396 2 : else if (td->td_rowsperstrip < td->td_imagelength)
1397 0 : sp->tbuflen = multiply_ms(td->td_imagewidth, td->td_rowsperstrip);
1398 : else
1399 2 : sp->tbuflen = multiply_ms(td->td_imagewidth, td->td_imagelength);
1400 2 : if (multiply_ms(sp->tbuflen, sizeof(int16_t)) == 0 ||
1401 2 : (sp->tbuf = (uint8_t *)_TIFFmallocExt(
1402 2 : tif, sp->tbuflen * sizeof(int16_t))) == NULL)
1403 : {
1404 0 : TIFFErrorExtR(tif, module, "No space for SGILog translation buffer");
1405 0 : return (0);
1406 : }
1407 2 : return (1);
1408 : }
1409 :
1410 0 : static int LogLuvGuessDataFmt(TIFFDirectory *td)
1411 : {
1412 : int guess;
1413 :
1414 : /*
1415 : * If the user didn't tell us their datafmt,
1416 : * take our best guess from the bitspersample.
1417 : */
1418 : #define PACK(a, b) (((a) << 3) | (b))
1419 0 : switch (PACK(td->td_bitspersample, td->td_sampleformat))
1420 : {
1421 0 : case PACK(32, SAMPLEFORMAT_IEEEFP):
1422 0 : guess = SGILOGDATAFMT_FLOAT;
1423 0 : break;
1424 0 : case PACK(32, SAMPLEFORMAT_VOID):
1425 : case PACK(32, SAMPLEFORMAT_UINT):
1426 : case PACK(32, SAMPLEFORMAT_INT):
1427 0 : guess = SGILOGDATAFMT_RAW;
1428 0 : break;
1429 0 : case PACK(16, SAMPLEFORMAT_VOID):
1430 : case PACK(16, SAMPLEFORMAT_INT):
1431 : case PACK(16, SAMPLEFORMAT_UINT):
1432 0 : guess = SGILOGDATAFMT_16BIT;
1433 0 : break;
1434 0 : case PACK(8, SAMPLEFORMAT_VOID):
1435 : case PACK(8, SAMPLEFORMAT_UINT):
1436 0 : guess = SGILOGDATAFMT_8BIT;
1437 0 : break;
1438 0 : default:
1439 0 : guess = SGILOGDATAFMT_UNKNOWN;
1440 0 : break;
1441 : #undef PACK
1442 : }
1443 : /*
1444 : * Double-check samples per pixel.
1445 : */
1446 0 : switch (td->td_samplesperpixel)
1447 : {
1448 0 : case 1:
1449 0 : if (guess != SGILOGDATAFMT_RAW)
1450 0 : guess = SGILOGDATAFMT_UNKNOWN;
1451 0 : break;
1452 0 : case 3:
1453 0 : if (guess == SGILOGDATAFMT_RAW)
1454 0 : guess = SGILOGDATAFMT_UNKNOWN;
1455 0 : break;
1456 0 : default:
1457 0 : guess = SGILOGDATAFMT_UNKNOWN;
1458 0 : break;
1459 : }
1460 0 : return (guess);
1461 : }
1462 :
1463 0 : static int LogLuvInitState(TIFF *tif)
1464 : {
1465 : static const char module[] = "LogLuvInitState";
1466 0 : TIFFDirectory *td = &tif->tif_dir;
1467 0 : LogLuvState *sp = DecoderState(tif);
1468 :
1469 0 : assert(sp != NULL);
1470 0 : assert(td->td_photometric == PHOTOMETRIC_LOGLUV);
1471 :
1472 : /* for some reason, we can't do this in TIFFInitLogLuv */
1473 0 : if (td->td_planarconfig != PLANARCONFIG_CONTIG)
1474 : {
1475 0 : TIFFErrorExtR(tif, module,
1476 : "SGILog compression cannot handle non-contiguous data");
1477 0 : return (0);
1478 : }
1479 0 : if (sp->user_datafmt == SGILOGDATAFMT_UNKNOWN)
1480 0 : sp->user_datafmt = LogLuvGuessDataFmt(td);
1481 0 : switch (sp->user_datafmt)
1482 : {
1483 0 : case SGILOGDATAFMT_FLOAT:
1484 0 : sp->pixel_size = 3 * sizeof(float);
1485 0 : break;
1486 0 : case SGILOGDATAFMT_16BIT:
1487 0 : sp->pixel_size = 3 * sizeof(int16_t);
1488 0 : break;
1489 0 : case SGILOGDATAFMT_RAW:
1490 0 : sp->pixel_size = sizeof(uint32_t);
1491 0 : break;
1492 0 : case SGILOGDATAFMT_8BIT:
1493 0 : sp->pixel_size = 3 * sizeof(uint8_t);
1494 0 : break;
1495 0 : default:
1496 0 : TIFFErrorExtR(
1497 : tif, module,
1498 : "No support for converting user data format to LogLuv");
1499 0 : return (0);
1500 : }
1501 0 : if (isTiled(tif))
1502 0 : sp->tbuflen = multiply_ms(td->td_tilewidth, td->td_tilelength);
1503 0 : else if (td->td_rowsperstrip < td->td_imagelength)
1504 0 : sp->tbuflen = multiply_ms(td->td_imagewidth, td->td_rowsperstrip);
1505 : else
1506 0 : sp->tbuflen = multiply_ms(td->td_imagewidth, td->td_imagelength);
1507 0 : if (multiply_ms(sp->tbuflen, sizeof(uint32_t)) == 0 ||
1508 0 : (sp->tbuf = (uint8_t *)_TIFFmallocExt(
1509 0 : tif, sp->tbuflen * sizeof(uint32_t))) == NULL)
1510 : {
1511 0 : TIFFErrorExtR(tif, module, "No space for SGILog translation buffer");
1512 0 : return (0);
1513 : }
1514 0 : return (1);
1515 : }
1516 :
1517 3 : static int LogLuvFixupTags(TIFF *tif)
1518 : {
1519 : (void)tif;
1520 3 : return (1);
1521 : }
1522 :
1523 2 : static int LogLuvSetupDecode(TIFF *tif)
1524 : {
1525 : static const char module[] = "LogLuvSetupDecode";
1526 2 : LogLuvState *sp = DecoderState(tif);
1527 2 : TIFFDirectory *td = &tif->tif_dir;
1528 :
1529 2 : tif->tif_postdecode = _TIFFNoPostDecode;
1530 2 : switch (td->td_photometric)
1531 : {
1532 0 : case PHOTOMETRIC_LOGLUV:
1533 0 : if (!LogLuvInitState(tif))
1534 0 : break;
1535 0 : if (td->td_compression == COMPRESSION_SGILOG24)
1536 : {
1537 0 : tif->tif_decoderow = LogLuvDecode24;
1538 0 : switch (sp->user_datafmt)
1539 : {
1540 0 : case SGILOGDATAFMT_FLOAT:
1541 0 : sp->tfunc = Luv24toXYZ;
1542 0 : break;
1543 0 : case SGILOGDATAFMT_16BIT:
1544 0 : sp->tfunc = Luv24toLuv48;
1545 0 : break;
1546 0 : case SGILOGDATAFMT_8BIT:
1547 0 : sp->tfunc = Luv24toRGB;
1548 0 : break;
1549 : }
1550 0 : }
1551 : else
1552 : {
1553 0 : tif->tif_decoderow = LogLuvDecode32;
1554 0 : switch (sp->user_datafmt)
1555 : {
1556 0 : case SGILOGDATAFMT_FLOAT:
1557 0 : sp->tfunc = Luv32toXYZ;
1558 0 : break;
1559 0 : case SGILOGDATAFMT_16BIT:
1560 0 : sp->tfunc = Luv32toLuv48;
1561 0 : break;
1562 0 : case SGILOGDATAFMT_8BIT:
1563 0 : sp->tfunc = Luv32toRGB;
1564 0 : break;
1565 : }
1566 0 : }
1567 0 : return (1);
1568 2 : case PHOTOMETRIC_LOGL:
1569 2 : if (!LogL16InitState(tif))
1570 0 : break;
1571 2 : tif->tif_decoderow = LogL16Decode;
1572 2 : switch (sp->user_datafmt)
1573 : {
1574 0 : case SGILOGDATAFMT_FLOAT:
1575 0 : sp->tfunc = L16toY;
1576 0 : break;
1577 1 : case SGILOGDATAFMT_8BIT:
1578 1 : sp->tfunc = L16toGry;
1579 1 : break;
1580 : }
1581 2 : return (1);
1582 0 : default:
1583 0 : TIFFErrorExtR(tif, module,
1584 : "Inappropriate photometric interpretation %" PRIu16
1585 : " for SGILog compression; %s",
1586 0 : td->td_photometric, "must be either LogLUV or LogL");
1587 0 : break;
1588 : }
1589 0 : return (0);
1590 : }
1591 :
1592 0 : static int LogLuvSetupEncode(TIFF *tif)
1593 : {
1594 : static const char module[] = "LogLuvSetupEncode";
1595 0 : LogLuvState *sp = EncoderState(tif);
1596 0 : TIFFDirectory *td = &tif->tif_dir;
1597 :
1598 0 : switch (td->td_photometric)
1599 : {
1600 0 : case PHOTOMETRIC_LOGLUV:
1601 0 : if (!LogLuvInitState(tif))
1602 0 : return (0);
1603 0 : if (td->td_compression == COMPRESSION_SGILOG24)
1604 : {
1605 0 : tif->tif_encoderow = LogLuvEncode24;
1606 0 : switch (sp->user_datafmt)
1607 : {
1608 0 : case SGILOGDATAFMT_FLOAT:
1609 0 : sp->tfunc = Luv24fromXYZ;
1610 0 : break;
1611 0 : case SGILOGDATAFMT_16BIT:
1612 0 : sp->tfunc = Luv24fromLuv48;
1613 0 : break;
1614 0 : case SGILOGDATAFMT_RAW:
1615 0 : break;
1616 0 : default:
1617 0 : goto notsupported;
1618 : }
1619 : }
1620 : else
1621 : {
1622 0 : tif->tif_encoderow = LogLuvEncode32;
1623 0 : switch (sp->user_datafmt)
1624 : {
1625 0 : case SGILOGDATAFMT_FLOAT:
1626 0 : sp->tfunc = Luv32fromXYZ;
1627 0 : break;
1628 0 : case SGILOGDATAFMT_16BIT:
1629 0 : sp->tfunc = Luv32fromLuv48;
1630 0 : break;
1631 0 : case SGILOGDATAFMT_RAW:
1632 0 : break;
1633 0 : default:
1634 0 : goto notsupported;
1635 : }
1636 : }
1637 0 : break;
1638 0 : case PHOTOMETRIC_LOGL:
1639 0 : if (!LogL16InitState(tif))
1640 0 : return (0);
1641 0 : tif->tif_encoderow = LogL16Encode;
1642 0 : switch (sp->user_datafmt)
1643 : {
1644 0 : case SGILOGDATAFMT_FLOAT:
1645 0 : sp->tfunc = L16fromY;
1646 0 : break;
1647 0 : case SGILOGDATAFMT_16BIT:
1648 0 : break;
1649 0 : default:
1650 0 : goto notsupported;
1651 : }
1652 0 : break;
1653 0 : default:
1654 0 : TIFFErrorExtR(tif, module,
1655 : "Inappropriate photometric interpretation %" PRIu16
1656 : " for SGILog compression; %s",
1657 0 : td->td_photometric, "must be either LogLUV or LogL");
1658 0 : return (0);
1659 : }
1660 0 : sp->encoder_state = 1;
1661 0 : return (1);
1662 0 : notsupported:
1663 0 : TIFFErrorExtR(tif, module,
1664 : "SGILog compression supported only for %s, or raw data",
1665 0 : td->td_photometric == PHOTOMETRIC_LOGL ? "Y, L" : "XYZ, Luv");
1666 0 : return (0);
1667 : }
1668 :
1669 0 : static void LogLuvClose(TIFF *tif)
1670 : {
1671 0 : LogLuvState *sp = (LogLuvState *)tif->tif_data;
1672 0 : TIFFDirectory *td = &tif->tif_dir;
1673 :
1674 0 : assert(sp != 0);
1675 : /*
1676 : * For consistency, we always want to write out the same
1677 : * bitspersample and sampleformat for our TIFF file,
1678 : * regardless of the data format being used by the application.
1679 : * Since this routine is called after tags have been set but
1680 : * before they have been recorded in the file, we reset them here.
1681 : * Note: this is really a nasty approach. See PixarLogClose
1682 : */
1683 0 : if (sp->encoder_state)
1684 : {
1685 : /* See PixarLogClose. Might avoid issues with tags whose size depends
1686 : * on those below, but not completely sure this is enough. */
1687 0 : td->td_samplesperpixel =
1688 0 : (td->td_photometric == PHOTOMETRIC_LOGL) ? 1 : 3;
1689 0 : td->td_bitspersample = 16;
1690 0 : td->td_sampleformat = SAMPLEFORMAT_INT;
1691 : }
1692 0 : }
1693 :
1694 3 : static void LogLuvCleanup(TIFF *tif)
1695 : {
1696 3 : LogLuvState *sp = (LogLuvState *)tif->tif_data;
1697 :
1698 3 : assert(sp != 0);
1699 :
1700 3 : tif->tif_tagmethods.vgetfield = sp->vgetparent;
1701 3 : tif->tif_tagmethods.vsetfield = sp->vsetparent;
1702 :
1703 3 : if (sp->tbuf)
1704 2 : _TIFFfreeExt(tif, sp->tbuf);
1705 3 : _TIFFfreeExt(tif, sp);
1706 3 : tif->tif_data = NULL;
1707 :
1708 3 : _TIFFSetDefaultCompressionState(tif);
1709 3 : }
1710 :
1711 27 : static int LogLuvVSetField(TIFF *tif, uint32_t tag, va_list ap)
1712 : {
1713 : static const char module[] = "LogLuvVSetField";
1714 27 : LogLuvState *sp = DecoderState(tif);
1715 : int bps, fmt;
1716 :
1717 27 : switch (tag)
1718 : {
1719 1 : case TIFFTAG_SGILOGDATAFMT:
1720 1 : sp->user_datafmt = (int)va_arg(ap, int);
1721 : /*
1722 : * Tweak the TIFF header so that the rest of libtiff knows what
1723 : * size of data will be passed between app and library, and
1724 : * assume that the app knows what it is doing and is not
1725 : * confused by these header manipulations...
1726 : */
1727 1 : switch (sp->user_datafmt)
1728 : {
1729 0 : case SGILOGDATAFMT_FLOAT:
1730 0 : bps = 32;
1731 0 : fmt = SAMPLEFORMAT_IEEEFP;
1732 0 : break;
1733 0 : case SGILOGDATAFMT_16BIT:
1734 0 : bps = 16;
1735 0 : fmt = SAMPLEFORMAT_INT;
1736 0 : break;
1737 0 : case SGILOGDATAFMT_RAW:
1738 0 : bps = 32;
1739 0 : fmt = SAMPLEFORMAT_UINT;
1740 0 : TIFFSetField(tif, TIFFTAG_SAMPLESPERPIXEL, 1);
1741 0 : break;
1742 1 : case SGILOGDATAFMT_8BIT:
1743 1 : bps = 8;
1744 1 : fmt = SAMPLEFORMAT_UINT;
1745 1 : break;
1746 0 : default:
1747 0 : TIFFErrorExtR(
1748 0 : tif, tif->tif_name,
1749 : "Unknown data format %d for LogLuv compression",
1750 : sp->user_datafmt);
1751 0 : return (0);
1752 : }
1753 1 : TIFFSetField(tif, TIFFTAG_BITSPERSAMPLE, bps);
1754 1 : TIFFSetField(tif, TIFFTAG_SAMPLEFORMAT, fmt);
1755 : /*
1756 : * Must recalculate sizes should bits/sample change.
1757 : */
1758 1 : tif->tif_tilesize = isTiled(tif) ? TIFFTileSize(tif) : (tmsize_t)-1;
1759 1 : tif->tif_scanlinesize = TIFFScanlineSize(tif);
1760 1 : return (1);
1761 0 : case TIFFTAG_SGILOGENCODE:
1762 0 : sp->encode_meth = (int)va_arg(ap, int);
1763 0 : if (sp->encode_meth != SGILOGENCODE_NODITHER &&
1764 0 : sp->encode_meth != SGILOGENCODE_RANDITHER)
1765 : {
1766 0 : TIFFErrorExtR(tif, module,
1767 : "Unknown encoding %d for LogLuv compression",
1768 : sp->encode_meth);
1769 0 : return (0);
1770 : }
1771 0 : return (1);
1772 26 : default:
1773 26 : return (*sp->vsetparent)(tif, tag, ap);
1774 : }
1775 : }
1776 :
1777 49 : static int LogLuvVGetField(TIFF *tif, uint32_t tag, va_list ap)
1778 : {
1779 49 : LogLuvState *sp = (LogLuvState *)tif->tif_data;
1780 :
1781 49 : switch (tag)
1782 : {
1783 0 : case TIFFTAG_SGILOGDATAFMT:
1784 0 : *va_arg(ap, int *) = sp->user_datafmt;
1785 0 : return (1);
1786 49 : default:
1787 49 : return (*sp->vgetparent)(tif, tag, ap);
1788 : }
1789 : }
1790 :
1791 : static const TIFFField LogLuvFields[] = {
1792 : {TIFFTAG_SGILOGDATAFMT, 0, 0, TIFF_SHORT, 0, TIFF_SETGET_INT, FIELD_PSEUDO,
1793 : TRUE, FALSE, "SGILogDataFmt", NULL},
1794 : {TIFFTAG_SGILOGENCODE, 0, 0, TIFF_SHORT, 0, TIFF_SETGET_INT, FIELD_PSEUDO,
1795 : TRUE, FALSE, "SGILogEncode", NULL}};
1796 :
1797 3 : int TIFFInitSGILog(TIFF *tif, int scheme)
1798 : {
1799 : static const char module[] = "TIFFInitSGILog";
1800 : LogLuvState *sp;
1801 :
1802 3 : assert(scheme == COMPRESSION_SGILOG24 || scheme == COMPRESSION_SGILOG);
1803 :
1804 : /*
1805 : * Merge codec-specific tag information.
1806 : */
1807 3 : if (!_TIFFMergeFields(tif, LogLuvFields, TIFFArrayCount(LogLuvFields)))
1808 : {
1809 0 : TIFFErrorExtR(tif, module, "Merging SGILog codec-specific tags failed");
1810 0 : return 0;
1811 : }
1812 :
1813 : /*
1814 : * Allocate state block so tag methods have storage to record values.
1815 : */
1816 3 : tif->tif_data = (uint8_t *)_TIFFmallocExt(tif, sizeof(LogLuvState));
1817 3 : if (tif->tif_data == NULL)
1818 0 : goto bad;
1819 3 : sp = (LogLuvState *)tif->tif_data;
1820 3 : _TIFFmemset((void *)sp, 0, sizeof(*sp));
1821 3 : sp->user_datafmt = SGILOGDATAFMT_UNKNOWN;
1822 3 : sp->encode_meth = (scheme == COMPRESSION_SGILOG24) ? SGILOGENCODE_RANDITHER
1823 3 : : SGILOGENCODE_NODITHER;
1824 3 : sp->tfunc = _logLuvNop;
1825 :
1826 : /*
1827 : * Install codec methods.
1828 : * NB: tif_decoderow & tif_encoderow are filled
1829 : * in at setup time.
1830 : */
1831 3 : tif->tif_fixuptags = LogLuvFixupTags;
1832 3 : tif->tif_setupdecode = LogLuvSetupDecode;
1833 3 : tif->tif_decodestrip = LogLuvDecodeStrip;
1834 3 : tif->tif_decodetile = LogLuvDecodeTile;
1835 3 : tif->tif_setupencode = LogLuvSetupEncode;
1836 3 : tif->tif_encodestrip = LogLuvEncodeStrip;
1837 3 : tif->tif_encodetile = LogLuvEncodeTile;
1838 3 : tif->tif_close = LogLuvClose;
1839 3 : tif->tif_cleanup = LogLuvCleanup;
1840 :
1841 : /*
1842 : * Override parent get/set field methods.
1843 : */
1844 3 : sp->vgetparent = tif->tif_tagmethods.vgetfield;
1845 3 : tif->tif_tagmethods.vgetfield = LogLuvVGetField; /* hook for codec tags */
1846 3 : sp->vsetparent = tif->tif_tagmethods.vsetfield;
1847 3 : tif->tif_tagmethods.vsetfield = LogLuvVSetField; /* hook for codec tags */
1848 :
1849 3 : return (1);
1850 0 : bad:
1851 0 : TIFFErrorExtR(tif, module, "%s: No space for LogLuv state block",
1852 : tif->tif_name);
1853 0 : return (0);
1854 : }
1855 : #endif /* LOGLUV_SUPPORT */
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