1 : /* $Id: tif_luv.c,v 1.35 2011-04-02 20:54:09 bfriesen Exp $ */
2 :
3 : /*
4 : * Copyright (c) 1997 Greg Ward Larson
5 : * Copyright (c) 1997 Silicon Graphics, Inc.
6 : *
7 : * Permission to use, copy, modify, distribute, and sell this software and
8 : * its documentation for any purpose is hereby granted without fee, provided
9 : * that (i) the above copyright notices and this permission notice appear in
10 : * all copies of the software and related documentation, and (ii) the names of
11 : * Sam Leffler, Greg Larson and Silicon Graphics may not be used in any
12 : * advertising or publicity relating to the software without the specific,
13 : * prior written permission of Sam Leffler, Greg Larson and Silicon Graphics.
14 : *
15 : * THE SOFTWARE IS PROVIDED "AS-IS" AND WITHOUT WARRANTY OF ANY KIND,
16 : * EXPRESS, IMPLIED OR OTHERWISE, INCLUDING WITHOUT LIMITATION, ANY
17 : * WARRANTY OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE.
18 : *
19 : * IN NO EVENT SHALL SAM LEFFLER, GREG LARSON OR SILICON GRAPHICS BE LIABLE
20 : * FOR ANY SPECIAL, INCIDENTAL, INDIRECT OR CONSEQUENTIAL DAMAGES OF ANY KIND,
21 : * OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
22 : * WHETHER OR NOT ADVISED OF THE POSSIBILITY OF DAMAGE, AND ON ANY THEORY OF
23 : * LIABILITY, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
24 : * OF THIS SOFTWARE.
25 : */
26 :
27 : #include "tiffiop.h"
28 : #ifdef LOGLUV_SUPPORT
29 :
30 : /*
31 : * TIFF Library.
32 : * LogLuv compression support for high dynamic range images.
33 : *
34 : * Contributed by Greg Larson.
35 : *
36 : * LogLuv image support uses the TIFF library to store 16 or 10-bit
37 : * log luminance values with 8 bits each of u and v or a 14-bit index.
38 : *
39 : * The codec can take as input and produce as output 32-bit IEEE float values
40 : * as well as 16-bit integer values. A 16-bit luminance is interpreted
41 : * as a sign bit followed by a 15-bit integer that is converted
42 : * to and from a linear magnitude using the transformation:
43 : *
44 : * L = 2^( (Le+.5)/256 - 64 ) # real from 15-bit
45 : *
46 : * Le = floor( 256*(log2(L) + 64) ) # 15-bit from real
47 : *
48 : * The actual conversion to world luminance units in candelas per sq. meter
49 : * requires an additional multiplier, which is stored in the TIFFTAG_STONITS.
50 : * This value is usually set such that a reasonable exposure comes from
51 : * clamping decoded luminances above 1 to 1 in the displayed image.
52 : *
53 : * The 16-bit values for u and v may be converted to real values by dividing
54 : * each by 32768. (This allows for negative values, which aren't useful as
55 : * far as we know, but are left in case of future improvements in human
56 : * color vision.)
57 : *
58 : * Conversion from (u,v), which is actually the CIE (u',v') system for
59 : * you color scientists, is accomplished by the following transformation:
60 : *
61 : * u = 4*x / (-2*x + 12*y + 3)
62 : * v = 9*y / (-2*x + 12*y + 3)
63 : *
64 : * x = 9*u / (6*u - 16*v + 12)
65 : * y = 4*v / (6*u - 16*v + 12)
66 : *
67 : * This process is greatly simplified by passing 32-bit IEEE floats
68 : * for each of three CIE XYZ coordinates. The codec then takes care
69 : * of conversion to and from LogLuv, though the application is still
70 : * responsible for interpreting the TIFFTAG_STONITS calibration factor.
71 : *
72 : * By definition, a CIE XYZ vector of [1 1 1] corresponds to a neutral white
73 : * point of (x,y)=(1/3,1/3). However, most color systems assume some other
74 : * white point, such as D65, and an absolute color conversion to XYZ then
75 : * to another color space with a different white point may introduce an
76 : * unwanted color cast to the image. It is often desirable, therefore, to
77 : * perform a white point conversion that maps the input white to [1 1 1]
78 : * in XYZ, then record the original white point using the TIFFTAG_WHITEPOINT
79 : * tag value. A decoder that demands absolute color calibration may use
80 : * this white point tag to get back the original colors, but usually it
81 : * will be ignored and the new white point will be used instead that
82 : * matches the output color space.
83 : *
84 : * Pixel information is compressed into one of two basic encodings, depending
85 : * on the setting of the compression tag, which is one of COMPRESSION_SGILOG
86 : * or COMPRESSION_SGILOG24. For COMPRESSION_SGILOG, greyscale data is
87 : * stored as:
88 : *
89 : * 1 15
90 : * |-+---------------|
91 : *
92 : * COMPRESSION_SGILOG color data is stored as:
93 : *
94 : * 1 15 8 8
95 : * |-+---------------|--------+--------|
96 : * S Le ue ve
97 : *
98 : * For the 24-bit COMPRESSION_SGILOG24 color format, the data is stored as:
99 : *
100 : * 10 14
101 : * |----------|--------------|
102 : * Le' Ce
103 : *
104 : * There is no sign bit in the 24-bit case, and the (u,v) chromaticity is
105 : * encoded as an index for optimal color resolution. The 10 log bits are
106 : * defined by the following conversions:
107 : *
108 : * L = 2^((Le'+.5)/64 - 12) # real from 10-bit
109 : *
110 : * Le' = floor( 64*(log2(L) + 12) ) # 10-bit from real
111 : *
112 : * The 10 bits of the smaller format may be converted into the 15 bits of
113 : * the larger format by multiplying by 4 and adding 13314. Obviously,
114 : * a smaller range of magnitudes is covered (about 5 orders of magnitude
115 : * instead of 38), and the lack of a sign bit means that negative luminances
116 : * are not allowed. (Well, they aren't allowed in the real world, either,
117 : * but they are useful for certain types of image processing.)
118 : *
119 : * The desired user format is controlled by the setting the internal
120 : * pseudo tag TIFFTAG_SGILOGDATAFMT to one of:
121 : * SGILOGDATAFMT_FLOAT = IEEE 32-bit float XYZ values
122 : * SGILOGDATAFMT_16BIT = 16-bit integer encodings of logL, u and v
123 : * Raw data i/o is also possible using:
124 : * SGILOGDATAFMT_RAW = 32-bit unsigned integer with encoded pixel
125 : * In addition, the following decoding is provided for ease of display:
126 : * SGILOGDATAFMT_8BIT = 8-bit default RGB gamma-corrected values
127 : *
128 : * For grayscale images, we provide the following data formats:
129 : * SGILOGDATAFMT_FLOAT = IEEE 32-bit float Y values
130 : * SGILOGDATAFMT_16BIT = 16-bit integer w/ encoded luminance
131 : * SGILOGDATAFMT_8BIT = 8-bit gray monitor values
132 : *
133 : * Note that the COMPRESSION_SGILOG applies a simple run-length encoding
134 : * scheme by separating the logL, u and v bytes for each row and applying
135 : * a PackBits type of compression. Since the 24-bit encoding is not
136 : * adaptive, the 32-bit color format takes less space in many cases.
137 : *
138 : * Further control is provided over the conversion from higher-resolution
139 : * formats to final encoded values through the pseudo tag
140 : * TIFFTAG_SGILOGENCODE:
141 : * SGILOGENCODE_NODITHER = do not dither encoded values
142 : * SGILOGENCODE_RANDITHER = apply random dithering during encoding
143 : *
144 : * The default value of this tag is SGILOGENCODE_NODITHER for
145 : * COMPRESSION_SGILOG to maximize run-length encoding and
146 : * SGILOGENCODE_RANDITHER for COMPRESSION_SGILOG24 to turn
147 : * quantization errors into noise.
148 : */
149 :
150 : #include <stdio.h>
151 : #include <stdlib.h>
152 : #include <math.h>
153 :
154 : /*
155 : * State block for each open TIFF
156 : * file using LogLuv compression/decompression.
157 : */
158 : typedef struct logLuvState LogLuvState;
159 :
160 : struct logLuvState {
161 : int user_datafmt; /* user data format */
162 : int encode_meth; /* encoding method */
163 : int pixel_size; /* bytes per pixel */
164 :
165 : uint8* tbuf; /* translation buffer */
166 : tmsize_t tbuflen; /* buffer length */
167 : void (*tfunc)(LogLuvState*, uint8*, tmsize_t);
168 :
169 : TIFFVSetMethod vgetparent; /* super-class method */
170 : TIFFVSetMethod vsetparent; /* super-class method */
171 : };
172 :
173 : #define DecoderState(tif) ((LogLuvState*) (tif)->tif_data)
174 : #define EncoderState(tif) ((LogLuvState*) (tif)->tif_data)
175 :
176 : #define SGILOGDATAFMT_UNKNOWN -1
177 :
178 : #define MINRUN 4 /* minimum run length */
179 :
180 : /*
181 : * Decode a string of 16-bit gray pixels.
182 : */
183 : static int
184 0 : LogL16Decode(TIFF* tif, uint8* op, tmsize_t occ, uint16 s)
185 : {
186 : static const char module[] = "LogL16Decode";
187 0 : LogLuvState* sp = DecoderState(tif);
188 : int shft;
189 : tmsize_t i;
190 : tmsize_t npixels;
191 : unsigned char* bp;
192 : int16* tp;
193 : int16 b;
194 : tmsize_t cc;
195 : int rc;
196 :
197 0 : assert(s == 0);
198 0 : assert(sp != NULL);
199 :
200 0 : npixels = occ / sp->pixel_size;
201 :
202 0 : if (sp->user_datafmt == SGILOGDATAFMT_16BIT)
203 0 : tp = (int16*) op;
204 : else {
205 0 : assert(sp->tbuflen >= npixels);
206 0 : tp = (int16*) sp->tbuf;
207 : }
208 0 : _TIFFmemset((void*) tp, 0, npixels*sizeof (tp[0]));
209 :
210 0 : bp = (unsigned char*) tif->tif_rawcp;
211 0 : cc = tif->tif_rawcc;
212 : /* get each byte string */
213 0 : for (shft = 2*8; (shft -= 8) >= 0; ) {
214 0 : for (i = 0; i < npixels && cc > 0; )
215 0 : if (*bp >= 128) { /* run */
216 0 : rc = *bp++ + (2-128); /* TODO: potential input buffer overrun when decoding corrupt or truncated data */
217 0 : b = (int16)(*bp++ << shft);
218 0 : cc -= 2;
219 0 : while (rc-- && i < npixels)
220 0 : tp[i++] |= b;
221 : } else { /* non-run */
222 0 : rc = *bp++; /* nul is noop */
223 0 : while (--cc && rc-- && i < npixels)
224 0 : tp[i++] |= (int16)*bp++ << shft;
225 : }
226 0 : if (i != npixels) {
227 : #if defined(__WIN32__) && (defined(_MSC_VER) || defined(__MINGW32__))
228 : TIFFErrorExt(tif->tif_clientdata, module,
229 : "Not enough data at row %lu (short %I64d pixels)",
230 : (unsigned long) tif->tif_row,
231 : (unsigned __int64) (npixels - i));
232 : #else
233 0 : TIFFErrorExt(tif->tif_clientdata, module,
234 : "Not enough data at row %lu (short %llu pixels)",
235 : (unsigned long) tif->tif_row,
236 0 : (unsigned long long) (npixels - i));
237 : #endif
238 0 : tif->tif_rawcp = (uint8*) bp;
239 0 : tif->tif_rawcc = cc;
240 0 : return (0);
241 : }
242 : }
243 0 : (*sp->tfunc)(sp, op, npixels);
244 0 : tif->tif_rawcp = (uint8*) bp;
245 0 : tif->tif_rawcc = cc;
246 0 : return (1);
247 : }
248 :
249 : /*
250 : * Decode a string of 24-bit pixels.
251 : */
252 : static int
253 0 : LogLuvDecode24(TIFF* tif, uint8* op, tmsize_t occ, uint16 s)
254 : {
255 : static const char module[] = "LogLuvDecode24";
256 0 : LogLuvState* sp = DecoderState(tif);
257 : tmsize_t cc;
258 : tmsize_t i;
259 : tmsize_t npixels;
260 : unsigned char* bp;
261 : uint32* tp;
262 :
263 0 : assert(s == 0);
264 0 : assert(sp != NULL);
265 :
266 0 : npixels = occ / sp->pixel_size;
267 :
268 0 : if (sp->user_datafmt == SGILOGDATAFMT_RAW)
269 0 : tp = (uint32 *)op;
270 : else {
271 0 : assert(sp->tbuflen >= npixels);
272 0 : tp = (uint32 *) sp->tbuf;
273 : }
274 : /* copy to array of uint32 */
275 0 : bp = (unsigned char*) tif->tif_rawcp;
276 0 : cc = tif->tif_rawcc;
277 0 : for (i = 0; i < npixels && cc > 0; i++) {
278 0 : tp[i] = bp[0] << 16 | bp[1] << 8 | bp[2];
279 0 : bp += 3;
280 0 : cc -= 3;
281 : }
282 0 : tif->tif_rawcp = (uint8*) bp;
283 0 : tif->tif_rawcc = cc;
284 0 : if (i != npixels) {
285 : #if defined(__WIN32__) && (defined(_MSC_VER) || defined(__MINGW32__))
286 : TIFFErrorExt(tif->tif_clientdata, module,
287 : "Not enough data at row %lu (short %I64d pixels)",
288 : (unsigned long) tif->tif_row,
289 : (unsigned __int64) (npixels - i));
290 : #else
291 0 : TIFFErrorExt(tif->tif_clientdata, module,
292 : "Not enough data at row %lu (short %llu pixels)",
293 : (unsigned long) tif->tif_row,
294 0 : (unsigned long long) (npixels - i));
295 : #endif
296 0 : return (0);
297 : }
298 0 : (*sp->tfunc)(sp, op, npixels);
299 0 : return (1);
300 : }
301 :
302 : /*
303 : * Decode a string of 32-bit pixels.
304 : */
305 : static int
306 0 : LogLuvDecode32(TIFF* tif, uint8* op, tmsize_t occ, uint16 s)
307 : {
308 : static const char module[] = "LogLuvDecode32";
309 : LogLuvState* sp;
310 : int shft;
311 : tmsize_t i;
312 : tmsize_t npixels;
313 : unsigned char* bp;
314 : uint32* tp;
315 : uint32 b;
316 : tmsize_t cc;
317 : int rc;
318 :
319 0 : assert(s == 0);
320 0 : sp = DecoderState(tif);
321 0 : assert(sp != NULL);
322 :
323 0 : npixels = occ / sp->pixel_size;
324 :
325 0 : if (sp->user_datafmt == SGILOGDATAFMT_RAW)
326 0 : tp = (uint32*) op;
327 : else {
328 0 : assert(sp->tbuflen >= npixels);
329 0 : tp = (uint32*) sp->tbuf;
330 : }
331 0 : _TIFFmemset((void*) tp, 0, npixels*sizeof (tp[0]));
332 :
333 0 : bp = (unsigned char*) tif->tif_rawcp;
334 0 : cc = tif->tif_rawcc;
335 : /* get each byte string */
336 0 : for (shft = 4*8; (shft -= 8) >= 0; ) {
337 0 : for (i = 0; i < npixels && cc > 0; )
338 0 : if (*bp >= 128) { /* run */
339 0 : rc = *bp++ + (2-128);
340 0 : b = (uint32)*bp++ << shft;
341 0 : cc -= 2; /* TODO: potential input buffer overrun when decoding corrupt or truncated data */
342 0 : while (rc-- && i < npixels)
343 0 : tp[i++] |= b;
344 : } else { /* non-run */
345 0 : rc = *bp++; /* nul is noop */
346 0 : while (--cc && rc-- && i < npixels)
347 0 : tp[i++] |= (uint32)*bp++ << shft;
348 : }
349 0 : if (i != npixels) {
350 : #if defined(__WIN32__) && (defined(_MSC_VER) || defined(__MINGW32__))
351 : TIFFErrorExt(tif->tif_clientdata, module,
352 : "Not enough data at row %lu (short %I64d pixels)",
353 : (unsigned long) tif->tif_row,
354 : (unsigned __int64) (npixels - i));
355 : #else
356 0 : TIFFErrorExt(tif->tif_clientdata, module,
357 : "Not enough data at row %lu (short %llu pixels)",
358 : (unsigned long) tif->tif_row,
359 0 : (unsigned long long) (npixels - i));
360 : #endif
361 0 : tif->tif_rawcp = (uint8*) bp;
362 0 : tif->tif_rawcc = cc;
363 0 : return (0);
364 : }
365 : }
366 0 : (*sp->tfunc)(sp, op, npixels);
367 0 : tif->tif_rawcp = (uint8*) bp;
368 0 : tif->tif_rawcc = cc;
369 0 : return (1);
370 : }
371 :
372 : /*
373 : * Decode a strip of pixels. We break it into rows to
374 : * maintain synchrony with the encode algorithm, which
375 : * is row by row.
376 : */
377 : static int
378 0 : LogLuvDecodeStrip(TIFF* tif, uint8* bp, tmsize_t cc, uint16 s)
379 : {
380 0 : tmsize_t rowlen = TIFFScanlineSize(tif);
381 :
382 0 : assert(cc%rowlen == 0);
383 0 : while (cc && (*tif->tif_decoderow)(tif, bp, rowlen, s))
384 0 : bp += rowlen, cc -= rowlen;
385 0 : return (cc == 0);
386 : }
387 :
388 : /*
389 : * Decode a tile of pixels. We break it into rows to
390 : * maintain synchrony with the encode algorithm, which
391 : * is row by row.
392 : */
393 : static int
394 0 : LogLuvDecodeTile(TIFF* tif, uint8* bp, tmsize_t cc, uint16 s)
395 : {
396 0 : tmsize_t rowlen = TIFFTileRowSize(tif);
397 :
398 0 : assert(cc%rowlen == 0);
399 0 : while (cc && (*tif->tif_decoderow)(tif, bp, rowlen, s))
400 0 : bp += rowlen, cc -= rowlen;
401 0 : return (cc == 0);
402 : }
403 :
404 : /*
405 : * Encode a row of 16-bit pixels.
406 : */
407 : static int
408 0 : LogL16Encode(TIFF* tif, uint8* bp, tmsize_t cc, uint16 s)
409 : {
410 0 : LogLuvState* sp = EncoderState(tif);
411 : int shft;
412 : tmsize_t i;
413 : tmsize_t j;
414 : tmsize_t npixels;
415 : uint8* op;
416 : int16* tp;
417 : int16 b;
418 : tmsize_t occ;
419 0 : int rc=0, mask;
420 : tmsize_t beg;
421 :
422 0 : assert(s == 0);
423 0 : assert(sp != NULL);
424 0 : npixels = cc / sp->pixel_size;
425 :
426 0 : if (sp->user_datafmt == SGILOGDATAFMT_16BIT)
427 0 : tp = (int16*) bp;
428 : else {
429 0 : tp = (int16*) sp->tbuf;
430 0 : assert(sp->tbuflen >= npixels);
431 0 : (*sp->tfunc)(sp, bp, npixels);
432 : }
433 : /* compress each byte string */
434 0 : op = tif->tif_rawcp;
435 0 : occ = tif->tif_rawdatasize - tif->tif_rawcc;
436 0 : for (shft = 2*8; (shft -= 8) >= 0; )
437 0 : for (i = 0; i < npixels; i += rc) {
438 0 : if (occ < 4) {
439 0 : tif->tif_rawcp = op;
440 0 : tif->tif_rawcc = tif->tif_rawdatasize - occ;
441 0 : if (!TIFFFlushData1(tif))
442 0 : return (-1);
443 0 : op = tif->tif_rawcp;
444 0 : occ = tif->tif_rawdatasize - tif->tif_rawcc;
445 : }
446 0 : mask = 0xff << shft; /* find next run */
447 0 : for (beg = i; beg < npixels; beg += rc) {
448 0 : b = (int16) (tp[beg] & mask);
449 0 : rc = 1;
450 0 : while (rc < 127+2 && beg+rc < npixels &&
451 0 : (tp[beg+rc] & mask) == b)
452 0 : rc++;
453 0 : if (rc >= MINRUN)
454 0 : break; /* long enough */
455 : }
456 0 : if (beg-i > 1 && beg-i < MINRUN) {
457 0 : b = (int16) (tp[i] & mask);/*check short run */
458 0 : j = i+1;
459 0 : while ((tp[j++] & mask) == b)
460 0 : if (j == beg) {
461 0 : *op++ = (uint8)(128-2+j-i);
462 0 : *op++ = (uint8)(b >> shft);
463 0 : occ -= 2;
464 0 : i = beg;
465 0 : break;
466 : }
467 : }
468 0 : while (i < beg) { /* write out non-run */
469 0 : if ((j = beg-i) > 127) j = 127;
470 0 : if (occ < j+3) {
471 0 : tif->tif_rawcp = op;
472 0 : tif->tif_rawcc = tif->tif_rawdatasize - occ;
473 0 : if (!TIFFFlushData1(tif))
474 0 : return (-1);
475 0 : op = tif->tif_rawcp;
476 0 : occ = tif->tif_rawdatasize - tif->tif_rawcc;
477 : }
478 0 : *op++ = (uint8) j; occ--;
479 0 : while (j--) {
480 0 : *op++ = (uint8) (tp[i++] >> shft & 0xff);
481 0 : occ--;
482 : }
483 : }
484 0 : if (rc >= MINRUN) { /* write out run */
485 0 : *op++ = (uint8) (128-2+rc);
486 0 : *op++ = (uint8) (tp[beg] >> shft & 0xff);
487 0 : occ -= 2;
488 : } else
489 0 : rc = 0;
490 : }
491 0 : tif->tif_rawcp = op;
492 0 : tif->tif_rawcc = tif->tif_rawdatasize - occ;
493 :
494 0 : return (1);
495 : }
496 :
497 : /*
498 : * Encode a row of 24-bit pixels.
499 : */
500 : static int
501 0 : LogLuvEncode24(TIFF* tif, uint8* bp, tmsize_t cc, uint16 s)
502 : {
503 0 : LogLuvState* sp = EncoderState(tif);
504 : tmsize_t i;
505 : tmsize_t npixels;
506 : tmsize_t occ;
507 : uint8* op;
508 : uint32* tp;
509 :
510 0 : assert(s == 0);
511 0 : assert(sp != NULL);
512 0 : npixels = cc / sp->pixel_size;
513 :
514 0 : if (sp->user_datafmt == SGILOGDATAFMT_RAW)
515 0 : tp = (uint32*) bp;
516 : else {
517 0 : tp = (uint32*) sp->tbuf;
518 0 : assert(sp->tbuflen >= npixels);
519 0 : (*sp->tfunc)(sp, bp, npixels);
520 : }
521 : /* write out encoded pixels */
522 0 : op = tif->tif_rawcp;
523 0 : occ = tif->tif_rawdatasize - tif->tif_rawcc;
524 0 : for (i = npixels; i--; ) {
525 0 : if (occ < 3) {
526 0 : tif->tif_rawcp = op;
527 0 : tif->tif_rawcc = tif->tif_rawdatasize - occ;
528 0 : if (!TIFFFlushData1(tif))
529 0 : return (-1);
530 0 : op = tif->tif_rawcp;
531 0 : occ = tif->tif_rawdatasize - tif->tif_rawcc;
532 : }
533 0 : *op++ = (uint8)(*tp >> 16);
534 0 : *op++ = (uint8)(*tp >> 8 & 0xff);
535 0 : *op++ = (uint8)(*tp++ & 0xff);
536 0 : occ -= 3;
537 : }
538 0 : tif->tif_rawcp = op;
539 0 : tif->tif_rawcc = tif->tif_rawdatasize - occ;
540 :
541 0 : return (1);
542 : }
543 :
544 : /*
545 : * Encode a row of 32-bit pixels.
546 : */
547 : static int
548 0 : LogLuvEncode32(TIFF* tif, uint8* bp, tmsize_t cc, uint16 s)
549 : {
550 0 : LogLuvState* sp = EncoderState(tif);
551 : int shft;
552 : tmsize_t i;
553 : tmsize_t j;
554 : tmsize_t npixels;
555 : uint8* op;
556 : uint32* tp;
557 : uint32 b;
558 : tmsize_t occ;
559 0 : int rc=0, mask;
560 : tmsize_t beg;
561 :
562 0 : assert(s == 0);
563 0 : assert(sp != NULL);
564 :
565 0 : npixels = cc / sp->pixel_size;
566 :
567 0 : if (sp->user_datafmt == SGILOGDATAFMT_RAW)
568 0 : tp = (uint32*) bp;
569 : else {
570 0 : tp = (uint32*) sp->tbuf;
571 0 : assert(sp->tbuflen >= npixels);
572 0 : (*sp->tfunc)(sp, bp, npixels);
573 : }
574 : /* compress each byte string */
575 0 : op = tif->tif_rawcp;
576 0 : occ = tif->tif_rawdatasize - tif->tif_rawcc;
577 0 : for (shft = 4*8; (shft -= 8) >= 0; )
578 0 : for (i = 0; i < npixels; i += rc) {
579 0 : if (occ < 4) {
580 0 : tif->tif_rawcp = op;
581 0 : tif->tif_rawcc = tif->tif_rawdatasize - occ;
582 0 : if (!TIFFFlushData1(tif))
583 0 : return (-1);
584 0 : op = tif->tif_rawcp;
585 0 : occ = tif->tif_rawdatasize - tif->tif_rawcc;
586 : }
587 0 : mask = 0xff << shft; /* find next run */
588 0 : for (beg = i; beg < npixels; beg += rc) {
589 0 : b = tp[beg] & mask;
590 0 : rc = 1;
591 0 : while (rc < 127+2 && beg+rc < npixels &&
592 0 : (tp[beg+rc] & mask) == b)
593 0 : rc++;
594 0 : if (rc >= MINRUN)
595 0 : break; /* long enough */
596 : }
597 0 : if (beg-i > 1 && beg-i < MINRUN) {
598 0 : b = tp[i] & mask; /* check short run */
599 0 : j = i+1;
600 0 : while ((tp[j++] & mask) == b)
601 0 : if (j == beg) {
602 0 : *op++ = (uint8)(128-2+j-i);
603 0 : *op++ = (uint8)(b >> shft);
604 0 : occ -= 2;
605 0 : i = beg;
606 0 : break;
607 : }
608 : }
609 0 : while (i < beg) { /* write out non-run */
610 0 : if ((j = beg-i) > 127) j = 127;
611 0 : if (occ < j+3) {
612 0 : tif->tif_rawcp = op;
613 0 : tif->tif_rawcc = tif->tif_rawdatasize - occ;
614 0 : if (!TIFFFlushData1(tif))
615 0 : return (-1);
616 0 : op = tif->tif_rawcp;
617 0 : occ = tif->tif_rawdatasize - tif->tif_rawcc;
618 : }
619 0 : *op++ = (uint8) j; occ--;
620 0 : while (j--) {
621 0 : *op++ = (uint8)(tp[i++] >> shft & 0xff);
622 0 : occ--;
623 : }
624 : }
625 0 : if (rc >= MINRUN) { /* write out run */
626 0 : *op++ = (uint8) (128-2+rc);
627 0 : *op++ = (uint8)(tp[beg] >> shft & 0xff);
628 0 : occ -= 2;
629 : } else
630 0 : rc = 0;
631 : }
632 0 : tif->tif_rawcp = op;
633 0 : tif->tif_rawcc = tif->tif_rawdatasize - occ;
634 :
635 0 : return (1);
636 : }
637 :
638 : /*
639 : * Encode a strip of pixels. We break it into rows to
640 : * avoid encoding runs across row boundaries.
641 : */
642 : static int
643 0 : LogLuvEncodeStrip(TIFF* tif, uint8* bp, tmsize_t cc, uint16 s)
644 : {
645 0 : tmsize_t rowlen = TIFFScanlineSize(tif);
646 :
647 0 : assert(cc%rowlen == 0);
648 0 : while (cc && (*tif->tif_encoderow)(tif, bp, rowlen, s) == 1)
649 0 : bp += rowlen, cc -= rowlen;
650 0 : return (cc == 0);
651 : }
652 :
653 : /*
654 : * Encode a tile of pixels. We break it into rows to
655 : * avoid encoding runs across row boundaries.
656 : */
657 : static int
658 0 : LogLuvEncodeTile(TIFF* tif, uint8* bp, tmsize_t cc, uint16 s)
659 : {
660 0 : tmsize_t rowlen = TIFFTileRowSize(tif);
661 :
662 0 : assert(cc%rowlen == 0);
663 0 : while (cc && (*tif->tif_encoderow)(tif, bp, rowlen, s) == 1)
664 0 : bp += rowlen, cc -= rowlen;
665 0 : return (cc == 0);
666 : }
667 :
668 : /*
669 : * Encode/Decode functions for converting to and from user formats.
670 : */
671 :
672 : #include "uvcode.h"
673 :
674 : #ifndef UVSCALE
675 : #define U_NEU 0.210526316
676 : #define V_NEU 0.473684211
677 : #define UVSCALE 410.
678 : #endif
679 :
680 : #ifndef M_LN2
681 : #define M_LN2 0.69314718055994530942
682 : #endif
683 : #ifndef M_PI
684 : #define M_PI 3.14159265358979323846
685 : #endif
686 : #define log2(x) ((1./M_LN2)*log(x))
687 : #define exp2(x) exp(M_LN2*(x))
688 :
689 : #define itrunc(x,m) ((m)==SGILOGENCODE_NODITHER ? \
690 : (int)(x) : \
691 : (int)((x) + rand()*(1./RAND_MAX) - .5))
692 :
693 : #if !LOGLUV_PUBLIC
694 : static
695 : #endif
696 : double
697 0 : LogL16toY(int p16) /* compute luminance from 16-bit LogL */
698 : {
699 0 : int Le = p16 & 0x7fff;
700 : double Y;
701 :
702 0 : if (!Le)
703 0 : return (0.);
704 0 : Y = exp(M_LN2/256.*(Le+.5) - M_LN2*64.);
705 0 : return (!(p16 & 0x8000) ? Y : -Y);
706 : }
707 :
708 : #if !LOGLUV_PUBLIC
709 : static
710 : #endif
711 : int
712 0 : LogL16fromY(double Y, int em) /* get 16-bit LogL from Y */
713 : {
714 0 : if (Y >= 1.8371976e19)
715 0 : return (0x7fff);
716 0 : if (Y <= -1.8371976e19)
717 0 : return (0xffff);
718 0 : if (Y > 5.4136769e-20)
719 0 : return itrunc(256.*(log2(Y) + 64.), em);
720 0 : if (Y < -5.4136769e-20)
721 0 : return (~0x7fff | itrunc(256.*(log2(-Y) + 64.), em));
722 0 : return (0);
723 : }
724 :
725 : static void
726 0 : L16toY(LogLuvState* sp, uint8* op, tmsize_t n)
727 : {
728 0 : int16* l16 = (int16*) sp->tbuf;
729 0 : float* yp = (float*) op;
730 :
731 0 : while (n-- > 0)
732 0 : *yp++ = (float)LogL16toY(*l16++);
733 0 : }
734 :
735 : static void
736 0 : L16toGry(LogLuvState* sp, uint8* op, tmsize_t n)
737 : {
738 0 : int16* l16 = (int16*) sp->tbuf;
739 0 : uint8* gp = (uint8*) op;
740 :
741 0 : while (n-- > 0) {
742 0 : double Y = LogL16toY(*l16++);
743 0 : *gp++ = (uint8) ((Y <= 0.) ? 0 : (Y >= 1.) ? 255 : (int)(256.*sqrt(Y)));
744 : }
745 0 : }
746 :
747 : static void
748 0 : L16fromY(LogLuvState* sp, uint8* op, tmsize_t n)
749 : {
750 0 : int16* l16 = (int16*) sp->tbuf;
751 0 : float* yp = (float*) op;
752 :
753 0 : while (n-- > 0)
754 0 : *l16++ = (int16) (LogL16fromY(*yp++, sp->encode_meth));
755 0 : }
756 :
757 : #if !LOGLUV_PUBLIC
758 : static
759 : #endif
760 : void
761 0 : XYZtoRGB24(float xyz[3], uint8 rgb[3])
762 : {
763 : double r, g, b;
764 : /* assume CCIR-709 primaries */
765 0 : r = 2.690*xyz[0] + -1.276*xyz[1] + -0.414*xyz[2];
766 0 : g = -1.022*xyz[0] + 1.978*xyz[1] + 0.044*xyz[2];
767 0 : b = 0.061*xyz[0] + -0.224*xyz[1] + 1.163*xyz[2];
768 : /* assume 2.0 gamma for speed */
769 : /* could use integer sqrt approx., but this is probably faster */
770 0 : rgb[0] = (uint8)((r<=0.) ? 0 : (r >= 1.) ? 255 : (int)(256.*sqrt(r)));
771 0 : rgb[1] = (uint8)((g<=0.) ? 0 : (g >= 1.) ? 255 : (int)(256.*sqrt(g)));
772 0 : rgb[2] = (uint8)((b<=0.) ? 0 : (b >= 1.) ? 255 : (int)(256.*sqrt(b)));
773 0 : }
774 :
775 : #if !LOGLUV_PUBLIC
776 : static
777 : #endif
778 : double
779 0 : LogL10toY(int p10) /* compute luminance from 10-bit LogL */
780 : {
781 0 : if (p10 == 0)
782 0 : return (0.);
783 0 : return (exp(M_LN2/64.*(p10+.5) - M_LN2*12.));
784 : }
785 :
786 : #if !LOGLUV_PUBLIC
787 : static
788 : #endif
789 : int
790 0 : LogL10fromY(double Y, int em) /* get 10-bit LogL from Y */
791 : {
792 0 : if (Y >= 15.742)
793 0 : return (0x3ff);
794 0 : else if (Y <= .00024283)
795 0 : return (0);
796 : else
797 0 : return itrunc(64.*(log2(Y) + 12.), em);
798 : }
799 :
800 : #define NANGLES 100
801 : #define uv2ang(u, v) ( (NANGLES*.499999999/M_PI) \
802 : * atan2((v)-V_NEU,(u)-U_NEU) + .5*NANGLES )
803 :
804 : static int
805 0 : oog_encode(double u, double v) /* encode out-of-gamut chroma */
806 : {
807 : static int oog_table[NANGLES];
808 : static int initialized = 0;
809 : register int i;
810 :
811 0 : if (!initialized) { /* set up perimeter table */
812 : double eps[NANGLES], ua, va, ang, epsa;
813 : int ui, vi, ustep;
814 0 : for (i = NANGLES; i--; )
815 0 : eps[i] = 2.;
816 0 : for (vi = UV_NVS; vi--; ) {
817 0 : va = UV_VSTART + (vi+.5)*UV_SQSIZ;
818 0 : ustep = uv_row[vi].nus-1;
819 0 : if (vi == UV_NVS-1 || vi == 0 || ustep <= 0)
820 0 : ustep = 1;
821 0 : for (ui = uv_row[vi].nus-1; ui >= 0; ui -= ustep) {
822 0 : ua = uv_row[vi].ustart + (ui+.5)*UV_SQSIZ;
823 0 : ang = uv2ang(ua, va);
824 0 : i = (int) ang;
825 0 : epsa = fabs(ang - (i+.5));
826 0 : if (epsa < eps[i]) {
827 0 : oog_table[i] = uv_row[vi].ncum + ui;
828 0 : eps[i] = epsa;
829 : }
830 : }
831 : }
832 0 : for (i = NANGLES; i--; ) /* fill any holes */
833 0 : if (eps[i] > 1.5) {
834 : int i1, i2;
835 0 : for (i1 = 1; i1 < NANGLES/2; i1++)
836 0 : if (eps[(i+i1)%NANGLES] < 1.5)
837 0 : break;
838 0 : for (i2 = 1; i2 < NANGLES/2; i2++)
839 0 : if (eps[(i+NANGLES-i2)%NANGLES] < 1.5)
840 0 : break;
841 0 : if (i1 < i2)
842 0 : oog_table[i] =
843 0 : oog_table[(i+i1)%NANGLES];
844 : else
845 0 : oog_table[i] =
846 0 : oog_table[(i+NANGLES-i2)%NANGLES];
847 : }
848 0 : initialized = 1;
849 : }
850 0 : i = (int) uv2ang(u, v); /* look up hue angle */
851 0 : return (oog_table[i]);
852 : }
853 :
854 : #undef uv2ang
855 : #undef NANGLES
856 :
857 : #if !LOGLUV_PUBLIC
858 : static
859 : #endif
860 : int
861 0 : uv_encode(double u, double v, int em) /* encode (u',v') coordinates */
862 : {
863 : register int vi, ui;
864 :
865 0 : if (v < UV_VSTART)
866 0 : return oog_encode(u, v);
867 0 : vi = itrunc((v - UV_VSTART)*(1./UV_SQSIZ), em);
868 0 : if (vi >= UV_NVS)
869 0 : return oog_encode(u, v);
870 0 : if (u < uv_row[vi].ustart)
871 0 : return oog_encode(u, v);
872 0 : ui = itrunc((u - uv_row[vi].ustart)*(1./UV_SQSIZ), em);
873 0 : if (ui >= uv_row[vi].nus)
874 0 : return oog_encode(u, v);
875 :
876 0 : return (uv_row[vi].ncum + ui);
877 : }
878 :
879 : #if !LOGLUV_PUBLIC
880 : static
881 : #endif
882 : int
883 0 : uv_decode(double *up, double *vp, int c) /* decode (u',v') index */
884 : {
885 : int upper, lower;
886 : register int ui, vi;
887 :
888 0 : if (c < 0 || c >= UV_NDIVS)
889 0 : return (-1);
890 0 : lower = 0; /* binary search */
891 0 : upper = UV_NVS;
892 0 : while (upper - lower > 1) {
893 0 : vi = (lower + upper) >> 1;
894 0 : ui = c - uv_row[vi].ncum;
895 0 : if (ui > 0)
896 0 : lower = vi;
897 0 : else if (ui < 0)
898 0 : upper = vi;
899 : else {
900 0 : lower = vi;
901 0 : break;
902 : }
903 : }
904 0 : vi = lower;
905 0 : ui = c - uv_row[vi].ncum;
906 0 : *up = uv_row[vi].ustart + (ui+.5)*UV_SQSIZ;
907 0 : *vp = UV_VSTART + (vi+.5)*UV_SQSIZ;
908 0 : return (0);
909 : }
910 :
911 : #if !LOGLUV_PUBLIC
912 : static
913 : #endif
914 : void
915 0 : LogLuv24toXYZ(uint32 p, float XYZ[3])
916 : {
917 : int Ce;
918 : double L, u, v, s, x, y;
919 : /* decode luminance */
920 0 : L = LogL10toY(p>>14 & 0x3ff);
921 0 : if (L <= 0.) {
922 0 : XYZ[0] = XYZ[1] = XYZ[2] = 0.;
923 0 : return;
924 : }
925 : /* decode color */
926 0 : Ce = p & 0x3fff;
927 0 : if (uv_decode(&u, &v, Ce) < 0) {
928 0 : u = U_NEU; v = V_NEU;
929 : }
930 0 : s = 1./(6.*u - 16.*v + 12.);
931 0 : x = 9.*u * s;
932 0 : y = 4.*v * s;
933 : /* convert to XYZ */
934 0 : XYZ[0] = (float)(x/y * L);
935 0 : XYZ[1] = (float)L;
936 0 : XYZ[2] = (float)((1.-x-y)/y * L);
937 : }
938 :
939 : #if !LOGLUV_PUBLIC
940 : static
941 : #endif
942 : uint32
943 0 : LogLuv24fromXYZ(float XYZ[3], int em)
944 : {
945 : int Le, Ce;
946 : double u, v, s;
947 : /* encode luminance */
948 0 : Le = LogL10fromY(XYZ[1], em);
949 : /* encode color */
950 0 : s = XYZ[0] + 15.*XYZ[1] + 3.*XYZ[2];
951 0 : if (!Le || s <= 0.) {
952 0 : u = U_NEU;
953 0 : v = V_NEU;
954 : } else {
955 0 : u = 4.*XYZ[0] / s;
956 0 : v = 9.*XYZ[1] / s;
957 : }
958 0 : Ce = uv_encode(u, v, em);
959 0 : if (Ce < 0) /* never happens */
960 0 : Ce = uv_encode(U_NEU, V_NEU, SGILOGENCODE_NODITHER);
961 : /* combine encodings */
962 0 : return (Le << 14 | Ce);
963 : }
964 :
965 : static void
966 0 : Luv24toXYZ(LogLuvState* sp, uint8* op, tmsize_t n)
967 : {
968 0 : uint32* luv = (uint32*) sp->tbuf;
969 0 : float* xyz = (float*) op;
970 :
971 0 : while (n-- > 0) {
972 0 : LogLuv24toXYZ(*luv, xyz);
973 0 : xyz += 3;
974 0 : luv++;
975 : }
976 0 : }
977 :
978 : static void
979 0 : Luv24toLuv48(LogLuvState* sp, uint8* op, tmsize_t n)
980 : {
981 0 : uint32* luv = (uint32*) sp->tbuf;
982 0 : int16* luv3 = (int16*) op;
983 :
984 0 : while (n-- > 0) {
985 : double u, v;
986 :
987 0 : *luv3++ = (int16)((*luv >> 12 & 0xffd) + 13314);
988 0 : if (uv_decode(&u, &v, *luv&0x3fff) < 0) {
989 0 : u = U_NEU;
990 0 : v = V_NEU;
991 : }
992 0 : *luv3++ = (int16)(u * (1L<<15));
993 0 : *luv3++ = (int16)(v * (1L<<15));
994 0 : luv++;
995 : }
996 0 : }
997 :
998 : static void
999 0 : Luv24toRGB(LogLuvState* sp, uint8* op, tmsize_t n)
1000 : {
1001 0 : uint32* luv = (uint32*) sp->tbuf;
1002 0 : uint8* rgb = (uint8*) op;
1003 :
1004 0 : while (n-- > 0) {
1005 : float xyz[3];
1006 :
1007 0 : LogLuv24toXYZ(*luv++, xyz);
1008 0 : XYZtoRGB24(xyz, rgb);
1009 0 : rgb += 3;
1010 : }
1011 0 : }
1012 :
1013 : static void
1014 0 : Luv24fromXYZ(LogLuvState* sp, uint8* op, tmsize_t n)
1015 : {
1016 0 : uint32* luv = (uint32*) sp->tbuf;
1017 0 : float* xyz = (float*) op;
1018 :
1019 0 : while (n-- > 0) {
1020 0 : *luv++ = LogLuv24fromXYZ(xyz, sp->encode_meth);
1021 0 : xyz += 3;
1022 : }
1023 0 : }
1024 :
1025 : static void
1026 0 : Luv24fromLuv48(LogLuvState* sp, uint8* op, tmsize_t n)
1027 : {
1028 0 : uint32* luv = (uint32*) sp->tbuf;
1029 0 : int16* luv3 = (int16*) op;
1030 :
1031 0 : while (n-- > 0) {
1032 : int Le, Ce;
1033 :
1034 0 : if (luv3[0] <= 0)
1035 0 : Le = 0;
1036 0 : else if (luv3[0] >= (1<<12)+3314)
1037 0 : Le = (1<<10) - 1;
1038 0 : else if (sp->encode_meth == SGILOGENCODE_NODITHER)
1039 0 : Le = (luv3[0]-3314) >> 2;
1040 : else
1041 0 : Le = itrunc(.25*(luv3[0]-3314.), sp->encode_meth);
1042 :
1043 0 : Ce = uv_encode((luv3[1]+.5)/(1<<15), (luv3[2]+.5)/(1<<15),
1044 : sp->encode_meth);
1045 0 : if (Ce < 0) /* never happens */
1046 0 : Ce = uv_encode(U_NEU, V_NEU, SGILOGENCODE_NODITHER);
1047 0 : *luv++ = (uint32)Le << 14 | Ce;
1048 0 : luv3 += 3;
1049 : }
1050 0 : }
1051 :
1052 : #if !LOGLUV_PUBLIC
1053 : static
1054 : #endif
1055 : void
1056 0 : LogLuv32toXYZ(uint32 p, float XYZ[3])
1057 : {
1058 : double L, u, v, s, x, y;
1059 : /* decode luminance */
1060 0 : L = LogL16toY((int)p >> 16);
1061 0 : if (L <= 0.) {
1062 0 : XYZ[0] = XYZ[1] = XYZ[2] = 0.;
1063 0 : return;
1064 : }
1065 : /* decode color */
1066 0 : u = 1./UVSCALE * ((p>>8 & 0xff) + .5);
1067 0 : v = 1./UVSCALE * ((p & 0xff) + .5);
1068 0 : s = 1./(6.*u - 16.*v + 12.);
1069 0 : x = 9.*u * s;
1070 0 : y = 4.*v * s;
1071 : /* convert to XYZ */
1072 0 : XYZ[0] = (float)(x/y * L);
1073 0 : XYZ[1] = (float)L;
1074 0 : XYZ[2] = (float)((1.-x-y)/y * L);
1075 : }
1076 :
1077 : #if !LOGLUV_PUBLIC
1078 : static
1079 : #endif
1080 : uint32
1081 0 : LogLuv32fromXYZ(float XYZ[3], int em)
1082 : {
1083 : unsigned int Le, ue, ve;
1084 : double u, v, s;
1085 : /* encode luminance */
1086 0 : Le = (unsigned int)LogL16fromY(XYZ[1], em);
1087 : /* encode color */
1088 0 : s = XYZ[0] + 15.*XYZ[1] + 3.*XYZ[2];
1089 0 : if (!Le || s <= 0.) {
1090 0 : u = U_NEU;
1091 0 : v = V_NEU;
1092 : } else {
1093 0 : u = 4.*XYZ[0] / s;
1094 0 : v = 9.*XYZ[1] / s;
1095 : }
1096 0 : if (u <= 0.) ue = 0;
1097 0 : else ue = itrunc(UVSCALE*u, em);
1098 0 : if (ue > 255) ue = 255;
1099 0 : if (v <= 0.) ve = 0;
1100 0 : else ve = itrunc(UVSCALE*v, em);
1101 0 : if (ve > 255) ve = 255;
1102 : /* combine encodings */
1103 0 : return (Le << 16 | ue << 8 | ve);
1104 : }
1105 :
1106 : static void
1107 0 : Luv32toXYZ(LogLuvState* sp, uint8* op, tmsize_t n)
1108 : {
1109 0 : uint32* luv = (uint32*) sp->tbuf;
1110 0 : float* xyz = (float*) op;
1111 :
1112 0 : while (n-- > 0) {
1113 0 : LogLuv32toXYZ(*luv++, xyz);
1114 0 : xyz += 3;
1115 : }
1116 0 : }
1117 :
1118 : static void
1119 0 : Luv32toLuv48(LogLuvState* sp, uint8* op, tmsize_t n)
1120 : {
1121 0 : uint32* luv = (uint32*) sp->tbuf;
1122 0 : int16* luv3 = (int16*) op;
1123 :
1124 0 : while (n-- > 0) {
1125 : double u, v;
1126 :
1127 0 : *luv3++ = (int16)(*luv >> 16);
1128 0 : u = 1./UVSCALE * ((*luv>>8 & 0xff) + .5);
1129 0 : v = 1./UVSCALE * ((*luv & 0xff) + .5);
1130 0 : *luv3++ = (int16)(u * (1L<<15));
1131 0 : *luv3++ = (int16)(v * (1L<<15));
1132 0 : luv++;
1133 : }
1134 0 : }
1135 :
1136 : static void
1137 0 : Luv32toRGB(LogLuvState* sp, uint8* op, tmsize_t n)
1138 : {
1139 0 : uint32* luv = (uint32*) sp->tbuf;
1140 0 : uint8* rgb = (uint8*) op;
1141 :
1142 0 : while (n-- > 0) {
1143 : float xyz[3];
1144 :
1145 0 : LogLuv32toXYZ(*luv++, xyz);
1146 0 : XYZtoRGB24(xyz, rgb);
1147 0 : rgb += 3;
1148 : }
1149 0 : }
1150 :
1151 : static void
1152 0 : Luv32fromXYZ(LogLuvState* sp, uint8* op, tmsize_t n)
1153 : {
1154 0 : uint32* luv = (uint32*) sp->tbuf;
1155 0 : float* xyz = (float*) op;
1156 :
1157 0 : while (n-- > 0) {
1158 0 : *luv++ = LogLuv32fromXYZ(xyz, sp->encode_meth);
1159 0 : xyz += 3;
1160 : }
1161 0 : }
1162 :
1163 : static void
1164 0 : Luv32fromLuv48(LogLuvState* sp, uint8* op, tmsize_t n)
1165 : {
1166 0 : uint32* luv = (uint32*) sp->tbuf;
1167 0 : int16* luv3 = (int16*) op;
1168 :
1169 0 : if (sp->encode_meth == SGILOGENCODE_NODITHER) {
1170 0 : while (n-- > 0) {
1171 0 : *luv++ = (uint32)luv3[0] << 16 |
1172 0 : (luv3[1]*(uint32)(UVSCALE+.5) >> 7 & 0xff00) |
1173 0 : (luv3[2]*(uint32)(UVSCALE+.5) >> 15 & 0xff);
1174 0 : luv3 += 3;
1175 : }
1176 0 : return;
1177 : }
1178 0 : while (n-- > 0) {
1179 0 : *luv++ = (uint32)luv3[0] << 16 |
1180 0 : (itrunc(luv3[1]*(UVSCALE/(1<<15)), sp->encode_meth) << 8 & 0xff00) |
1181 0 : (itrunc(luv3[2]*(UVSCALE/(1<<15)), sp->encode_meth) & 0xff);
1182 0 : luv3 += 3;
1183 : }
1184 : }
1185 :
1186 : static void
1187 0 : _logLuvNop(LogLuvState* sp, uint8* op, tmsize_t n)
1188 : {
1189 : (void) sp; (void) op; (void) n;
1190 0 : }
1191 :
1192 : static int
1193 0 : LogL16GuessDataFmt(TIFFDirectory *td)
1194 : {
1195 : #define PACK(s,b,f) (((b)<<6)|((s)<<3)|(f))
1196 0 : switch (PACK(td->td_samplesperpixel, td->td_bitspersample, td->td_sampleformat)) {
1197 : case PACK(1, 32, SAMPLEFORMAT_IEEEFP):
1198 0 : return (SGILOGDATAFMT_FLOAT);
1199 : case PACK(1, 16, SAMPLEFORMAT_VOID):
1200 : case PACK(1, 16, SAMPLEFORMAT_INT):
1201 : case PACK(1, 16, SAMPLEFORMAT_UINT):
1202 0 : return (SGILOGDATAFMT_16BIT);
1203 : case PACK(1, 8, SAMPLEFORMAT_VOID):
1204 : case PACK(1, 8, SAMPLEFORMAT_UINT):
1205 0 : return (SGILOGDATAFMT_8BIT);
1206 : }
1207 : #undef PACK
1208 0 : return (SGILOGDATAFMT_UNKNOWN);
1209 : }
1210 :
1211 : static tmsize_t
1212 0 : multiply_ms(tmsize_t m1, tmsize_t m2)
1213 : {
1214 0 : tmsize_t bytes = m1 * m2;
1215 :
1216 0 : if (m1 && bytes / m1 != m2)
1217 0 : bytes = 0;
1218 :
1219 0 : return bytes;
1220 : }
1221 :
1222 : static int
1223 0 : LogL16InitState(TIFF* tif)
1224 : {
1225 : static const char module[] = "LogL16InitState";
1226 0 : TIFFDirectory *td = &tif->tif_dir;
1227 0 : LogLuvState* sp = DecoderState(tif);
1228 :
1229 0 : assert(sp != NULL);
1230 0 : assert(td->td_photometric == PHOTOMETRIC_LOGL);
1231 :
1232 : /* for some reason, we can't do this in TIFFInitLogL16 */
1233 0 : if (sp->user_datafmt == SGILOGDATAFMT_UNKNOWN)
1234 0 : sp->user_datafmt = LogL16GuessDataFmt(td);
1235 0 : switch (sp->user_datafmt) {
1236 : case SGILOGDATAFMT_FLOAT:
1237 0 : sp->pixel_size = sizeof (float);
1238 0 : break;
1239 : case SGILOGDATAFMT_16BIT:
1240 0 : sp->pixel_size = sizeof (int16);
1241 0 : break;
1242 : case SGILOGDATAFMT_8BIT:
1243 0 : sp->pixel_size = sizeof (uint8);
1244 0 : break;
1245 : default:
1246 0 : TIFFErrorExt(tif->tif_clientdata, module,
1247 : "No support for converting user data format to LogL");
1248 0 : return (0);
1249 : }
1250 0 : if( isTiled(tif) )
1251 0 : sp->tbuflen = multiply_ms(td->td_tilewidth, td->td_tilelength);
1252 : else
1253 0 : sp->tbuflen = multiply_ms(td->td_imagewidth, td->td_rowsperstrip);
1254 0 : if (multiply_ms(sp->tbuflen, sizeof (int16)) == 0 ||
1255 0 : (sp->tbuf = (uint8*) _TIFFmalloc(sp->tbuflen * sizeof (int16))) == NULL) {
1256 0 : TIFFErrorExt(tif->tif_clientdata, module, "No space for SGILog translation buffer");
1257 0 : return (0);
1258 : }
1259 0 : return (1);
1260 : }
1261 :
1262 : static int
1263 0 : LogLuvGuessDataFmt(TIFFDirectory *td)
1264 : {
1265 : int guess;
1266 :
1267 : /*
1268 : * If the user didn't tell us their datafmt,
1269 : * take our best guess from the bitspersample.
1270 : */
1271 : #define PACK(a,b) (((a)<<3)|(b))
1272 0 : switch (PACK(td->td_bitspersample, td->td_sampleformat)) {
1273 : case PACK(32, SAMPLEFORMAT_IEEEFP):
1274 0 : guess = SGILOGDATAFMT_FLOAT;
1275 0 : break;
1276 : case PACK(32, SAMPLEFORMAT_VOID):
1277 : case PACK(32, SAMPLEFORMAT_UINT):
1278 : case PACK(32, SAMPLEFORMAT_INT):
1279 0 : guess = SGILOGDATAFMT_RAW;
1280 0 : break;
1281 : case PACK(16, SAMPLEFORMAT_VOID):
1282 : case PACK(16, SAMPLEFORMAT_INT):
1283 : case PACK(16, SAMPLEFORMAT_UINT):
1284 0 : guess = SGILOGDATAFMT_16BIT;
1285 0 : break;
1286 : case PACK( 8, SAMPLEFORMAT_VOID):
1287 : case PACK( 8, SAMPLEFORMAT_UINT):
1288 0 : guess = SGILOGDATAFMT_8BIT;
1289 0 : break;
1290 : default:
1291 0 : guess = SGILOGDATAFMT_UNKNOWN;
1292 : break;
1293 : #undef PACK
1294 : }
1295 : /*
1296 : * Double-check samples per pixel.
1297 : */
1298 0 : switch (td->td_samplesperpixel) {
1299 : case 1:
1300 0 : if (guess != SGILOGDATAFMT_RAW)
1301 0 : guess = SGILOGDATAFMT_UNKNOWN;
1302 0 : break;
1303 : case 3:
1304 0 : if (guess == SGILOGDATAFMT_RAW)
1305 0 : guess = SGILOGDATAFMT_UNKNOWN;
1306 0 : break;
1307 : default:
1308 0 : guess = SGILOGDATAFMT_UNKNOWN;
1309 : break;
1310 : }
1311 0 : return (guess);
1312 : }
1313 :
1314 : static int
1315 0 : LogLuvInitState(TIFF* tif)
1316 : {
1317 : static const char module[] = "LogLuvInitState";
1318 0 : TIFFDirectory* td = &tif->tif_dir;
1319 0 : LogLuvState* sp = DecoderState(tif);
1320 :
1321 0 : assert(sp != NULL);
1322 0 : assert(td->td_photometric == PHOTOMETRIC_LOGLUV);
1323 :
1324 : /* for some reason, we can't do this in TIFFInitLogLuv */
1325 0 : if (td->td_planarconfig != PLANARCONFIG_CONTIG) {
1326 0 : TIFFErrorExt(tif->tif_clientdata, module,
1327 : "SGILog compression cannot handle non-contiguous data");
1328 0 : return (0);
1329 : }
1330 0 : if (sp->user_datafmt == SGILOGDATAFMT_UNKNOWN)
1331 0 : sp->user_datafmt = LogLuvGuessDataFmt(td);
1332 0 : switch (sp->user_datafmt) {
1333 : case SGILOGDATAFMT_FLOAT:
1334 0 : sp->pixel_size = 3*sizeof (float);
1335 0 : break;
1336 : case SGILOGDATAFMT_16BIT:
1337 0 : sp->pixel_size = 3*sizeof (int16);
1338 0 : break;
1339 : case SGILOGDATAFMT_RAW:
1340 0 : sp->pixel_size = sizeof (uint32);
1341 0 : break;
1342 : case SGILOGDATAFMT_8BIT:
1343 0 : sp->pixel_size = 3*sizeof (uint8);
1344 0 : break;
1345 : default:
1346 0 : TIFFErrorExt(tif->tif_clientdata, module,
1347 : "No support for converting user data format to LogLuv");
1348 0 : return (0);
1349 : }
1350 0 : if( isTiled(tif) )
1351 0 : sp->tbuflen = multiply_ms(td->td_tilewidth, td->td_tilelength);
1352 : else
1353 0 : sp->tbuflen = multiply_ms(td->td_imagewidth, td->td_rowsperstrip);
1354 0 : if (multiply_ms(sp->tbuflen, sizeof (uint32)) == 0 ||
1355 0 : (sp->tbuf = (uint8*) _TIFFmalloc(sp->tbuflen * sizeof (uint32))) == NULL) {
1356 0 : TIFFErrorExt(tif->tif_clientdata, module, "No space for SGILog translation buffer");
1357 0 : return (0);
1358 : }
1359 0 : return (1);
1360 : }
1361 :
1362 : static int
1363 0 : LogLuvFixupTags(TIFF* tif)
1364 : {
1365 : (void) tif;
1366 0 : return (1);
1367 : }
1368 :
1369 : static int
1370 0 : LogLuvSetupDecode(TIFF* tif)
1371 : {
1372 : static const char module[] = "LogLuvSetupDecode";
1373 0 : LogLuvState* sp = DecoderState(tif);
1374 0 : TIFFDirectory* td = &tif->tif_dir;
1375 :
1376 0 : tif->tif_postdecode = _TIFFNoPostDecode;
1377 0 : switch (td->td_photometric) {
1378 : case PHOTOMETRIC_LOGLUV:
1379 0 : if (!LogLuvInitState(tif))
1380 0 : break;
1381 0 : if (td->td_compression == COMPRESSION_SGILOG24) {
1382 0 : tif->tif_decoderow = LogLuvDecode24;
1383 0 : switch (sp->user_datafmt) {
1384 : case SGILOGDATAFMT_FLOAT:
1385 0 : sp->tfunc = Luv24toXYZ;
1386 0 : break;
1387 : case SGILOGDATAFMT_16BIT:
1388 0 : sp->tfunc = Luv24toLuv48;
1389 0 : break;
1390 : case SGILOGDATAFMT_8BIT:
1391 0 : sp->tfunc = Luv24toRGB;
1392 : break;
1393 : }
1394 : } else {
1395 0 : tif->tif_decoderow = LogLuvDecode32;
1396 0 : switch (sp->user_datafmt) {
1397 : case SGILOGDATAFMT_FLOAT:
1398 0 : sp->tfunc = Luv32toXYZ;
1399 0 : break;
1400 : case SGILOGDATAFMT_16BIT:
1401 0 : sp->tfunc = Luv32toLuv48;
1402 0 : break;
1403 : case SGILOGDATAFMT_8BIT:
1404 0 : sp->tfunc = Luv32toRGB;
1405 : break;
1406 : }
1407 : }
1408 0 : return (1);
1409 : case PHOTOMETRIC_LOGL:
1410 0 : if (!LogL16InitState(tif))
1411 0 : break;
1412 0 : tif->tif_decoderow = LogL16Decode;
1413 0 : switch (sp->user_datafmt) {
1414 : case SGILOGDATAFMT_FLOAT:
1415 0 : sp->tfunc = L16toY;
1416 0 : break;
1417 : case SGILOGDATAFMT_8BIT:
1418 0 : sp->tfunc = L16toGry;
1419 : break;
1420 : }
1421 0 : return (1);
1422 : default:
1423 0 : TIFFErrorExt(tif->tif_clientdata, module,
1424 : "Inappropriate photometric interpretation %d for SGILog compression; %s",
1425 0 : td->td_photometric, "must be either LogLUV or LogL");
1426 : break;
1427 : }
1428 0 : return (0);
1429 : }
1430 :
1431 : static int
1432 0 : LogLuvSetupEncode(TIFF* tif)
1433 : {
1434 : static const char module[] = "LogLuvSetupEncode";
1435 0 : LogLuvState* sp = EncoderState(tif);
1436 0 : TIFFDirectory* td = &tif->tif_dir;
1437 :
1438 0 : switch (td->td_photometric) {
1439 : case PHOTOMETRIC_LOGLUV:
1440 0 : if (!LogLuvInitState(tif))
1441 0 : break;
1442 0 : if (td->td_compression == COMPRESSION_SGILOG24) {
1443 0 : tif->tif_encoderow = LogLuvEncode24;
1444 0 : switch (sp->user_datafmt) {
1445 : case SGILOGDATAFMT_FLOAT:
1446 0 : sp->tfunc = Luv24fromXYZ;
1447 0 : break;
1448 : case SGILOGDATAFMT_16BIT:
1449 0 : sp->tfunc = Luv24fromLuv48;
1450 0 : break;
1451 : case SGILOGDATAFMT_RAW:
1452 0 : break;
1453 : default:
1454 0 : goto notsupported;
1455 : }
1456 : } else {
1457 0 : tif->tif_encoderow = LogLuvEncode32;
1458 0 : switch (sp->user_datafmt) {
1459 : case SGILOGDATAFMT_FLOAT:
1460 0 : sp->tfunc = Luv32fromXYZ;
1461 0 : break;
1462 : case SGILOGDATAFMT_16BIT:
1463 0 : sp->tfunc = Luv32fromLuv48;
1464 0 : break;
1465 : case SGILOGDATAFMT_RAW:
1466 0 : break;
1467 : default:
1468 0 : goto notsupported;
1469 : }
1470 : }
1471 0 : break;
1472 : case PHOTOMETRIC_LOGL:
1473 0 : if (!LogL16InitState(tif))
1474 0 : break;
1475 0 : tif->tif_encoderow = LogL16Encode;
1476 0 : switch (sp->user_datafmt) {
1477 : case SGILOGDATAFMT_FLOAT:
1478 0 : sp->tfunc = L16fromY;
1479 0 : break;
1480 : case SGILOGDATAFMT_16BIT:
1481 0 : break;
1482 : default:
1483 0 : goto notsupported;
1484 : }
1485 0 : break;
1486 : default:
1487 0 : TIFFErrorExt(tif->tif_clientdata, module,
1488 : "Inappropriate photometric interpretation %d for SGILog compression; %s",
1489 0 : td->td_photometric, "must be either LogLUV or LogL");
1490 : break;
1491 : }
1492 0 : return (1);
1493 : notsupported:
1494 0 : TIFFErrorExt(tif->tif_clientdata, module,
1495 : "SGILog compression supported only for %s, or raw data",
1496 0 : td->td_photometric == PHOTOMETRIC_LOGL ? "Y, L" : "XYZ, Luv");
1497 0 : return (0);
1498 : }
1499 :
1500 : static void
1501 0 : LogLuvClose(TIFF* tif)
1502 : {
1503 0 : TIFFDirectory *td = &tif->tif_dir;
1504 :
1505 : /*
1506 : * For consistency, we always want to write out the same
1507 : * bitspersample and sampleformat for our TIFF file,
1508 : * regardless of the data format being used by the application.
1509 : * Since this routine is called after tags have been set but
1510 : * before they have been recorded in the file, we reset them here.
1511 : */
1512 0 : td->td_samplesperpixel =
1513 0 : (td->td_photometric == PHOTOMETRIC_LOGL) ? 1 : 3;
1514 0 : td->td_bitspersample = 16;
1515 0 : td->td_sampleformat = SAMPLEFORMAT_INT;
1516 0 : }
1517 :
1518 : static void
1519 0 : LogLuvCleanup(TIFF* tif)
1520 : {
1521 0 : LogLuvState* sp = (LogLuvState *)tif->tif_data;
1522 :
1523 0 : assert(sp != 0);
1524 :
1525 0 : tif->tif_tagmethods.vgetfield = sp->vgetparent;
1526 0 : tif->tif_tagmethods.vsetfield = sp->vsetparent;
1527 :
1528 0 : if (sp->tbuf)
1529 0 : _TIFFfree(sp->tbuf);
1530 0 : _TIFFfree(sp);
1531 0 : tif->tif_data = NULL;
1532 :
1533 0 : _TIFFSetDefaultCompressionState(tif);
1534 0 : }
1535 :
1536 : static int
1537 0 : LogLuvVSetField(TIFF* tif, uint32 tag, va_list ap)
1538 : {
1539 : static const char module[] = "LogLuvVSetField";
1540 0 : LogLuvState* sp = DecoderState(tif);
1541 : int bps, fmt;
1542 :
1543 0 : switch (tag) {
1544 : case TIFFTAG_SGILOGDATAFMT:
1545 0 : sp->user_datafmt = (int) va_arg(ap, int);
1546 : /*
1547 : * Tweak the TIFF header so that the rest of libtiff knows what
1548 : * size of data will be passed between app and library, and
1549 : * assume that the app knows what it is doing and is not
1550 : * confused by these header manipulations...
1551 : */
1552 0 : switch (sp->user_datafmt) {
1553 : case SGILOGDATAFMT_FLOAT:
1554 0 : bps = 32, fmt = SAMPLEFORMAT_IEEEFP;
1555 0 : break;
1556 : case SGILOGDATAFMT_16BIT:
1557 0 : bps = 16, fmt = SAMPLEFORMAT_INT;
1558 0 : break;
1559 : case SGILOGDATAFMT_RAW:
1560 0 : bps = 32, fmt = SAMPLEFORMAT_UINT;
1561 0 : TIFFSetField(tif, TIFFTAG_SAMPLESPERPIXEL, 1);
1562 0 : break;
1563 : case SGILOGDATAFMT_8BIT:
1564 0 : bps = 8, fmt = SAMPLEFORMAT_UINT;
1565 0 : break;
1566 : default:
1567 0 : TIFFErrorExt(tif->tif_clientdata, tif->tif_name,
1568 : "Unknown data format %d for LogLuv compression",
1569 : sp->user_datafmt);
1570 0 : return (0);
1571 : }
1572 0 : TIFFSetField(tif, TIFFTAG_BITSPERSAMPLE, bps);
1573 0 : TIFFSetField(tif, TIFFTAG_SAMPLEFORMAT, fmt);
1574 : /*
1575 : * Must recalculate sizes should bits/sample change.
1576 : */
1577 0 : tif->tif_tilesize = isTiled(tif) ? TIFFTileSize(tif) : (tmsize_t) -1;
1578 0 : tif->tif_scanlinesize = TIFFScanlineSize(tif);
1579 0 : return (1);
1580 : case TIFFTAG_SGILOGENCODE:
1581 0 : sp->encode_meth = (int) va_arg(ap, int);
1582 0 : if (sp->encode_meth != SGILOGENCODE_NODITHER &&
1583 0 : sp->encode_meth != SGILOGENCODE_RANDITHER) {
1584 0 : TIFFErrorExt(tif->tif_clientdata, module,
1585 : "Unknown encoding %d for LogLuv compression",
1586 : sp->encode_meth);
1587 0 : return (0);
1588 : }
1589 0 : return (1);
1590 : default:
1591 0 : return (*sp->vsetparent)(tif, tag, ap);
1592 : }
1593 : }
1594 :
1595 : static int
1596 0 : LogLuvVGetField(TIFF* tif, uint32 tag, va_list ap)
1597 : {
1598 0 : LogLuvState *sp = (LogLuvState *)tif->tif_data;
1599 :
1600 0 : switch (tag) {
1601 : case TIFFTAG_SGILOGDATAFMT:
1602 0 : *va_arg(ap, int*) = sp->user_datafmt;
1603 0 : return (1);
1604 : default:
1605 0 : return (*sp->vgetparent)(tif, tag, ap);
1606 : }
1607 : }
1608 :
1609 : static const TIFFField LogLuvFields[] = {
1610 : { TIFFTAG_SGILOGDATAFMT, 0, 0, TIFF_SHORT, 0, TIFF_SETGET_INT, TIFF_SETGET_UNDEFINED, FIELD_PSEUDO, TRUE, FALSE, "SGILogDataFmt", NULL},
1611 : { TIFFTAG_SGILOGENCODE, 0, 0, TIFF_SHORT, 0, TIFF_SETGET_INT, TIFF_SETGET_UNDEFINED, FIELD_PSEUDO, TRUE, FALSE, "SGILogEncode", NULL}
1612 : };
1613 :
1614 : int
1615 0 : TIFFInitSGILog(TIFF* tif, int scheme)
1616 : {
1617 : static const char module[] = "TIFFInitSGILog";
1618 : LogLuvState* sp;
1619 :
1620 0 : assert(scheme == COMPRESSION_SGILOG24 || scheme == COMPRESSION_SGILOG);
1621 :
1622 : /*
1623 : * Merge codec-specific tag information.
1624 : */
1625 0 : if (!_TIFFMergeFields(tif, LogLuvFields,
1626 : TIFFArrayCount(LogLuvFields))) {
1627 0 : TIFFErrorExt(tif->tif_clientdata, module,
1628 : "Merging SGILog codec-specific tags failed");
1629 0 : return 0;
1630 : }
1631 :
1632 : /*
1633 : * Allocate state block so tag methods have storage to record values.
1634 : */
1635 0 : tif->tif_data = (uint8*) _TIFFmalloc(sizeof (LogLuvState));
1636 0 : if (tif->tif_data == NULL)
1637 0 : goto bad;
1638 0 : sp = (LogLuvState*) tif->tif_data;
1639 0 : _TIFFmemset((void*)sp, 0, sizeof (*sp));
1640 0 : sp->user_datafmt = SGILOGDATAFMT_UNKNOWN;
1641 0 : sp->encode_meth = (scheme == COMPRESSION_SGILOG24) ?
1642 : SGILOGENCODE_RANDITHER : SGILOGENCODE_NODITHER;
1643 0 : sp->tfunc = _logLuvNop;
1644 :
1645 : /*
1646 : * Install codec methods.
1647 : * NB: tif_decoderow & tif_encoderow are filled
1648 : * in at setup time.
1649 : */
1650 0 : tif->tif_fixuptags = LogLuvFixupTags;
1651 0 : tif->tif_setupdecode = LogLuvSetupDecode;
1652 0 : tif->tif_decodestrip = LogLuvDecodeStrip;
1653 0 : tif->tif_decodetile = LogLuvDecodeTile;
1654 0 : tif->tif_setupencode = LogLuvSetupEncode;
1655 0 : tif->tif_encodestrip = LogLuvEncodeStrip;
1656 0 : tif->tif_encodetile = LogLuvEncodeTile;
1657 0 : tif->tif_close = LogLuvClose;
1658 0 : tif->tif_cleanup = LogLuvCleanup;
1659 :
1660 : /*
1661 : * Override parent get/set field methods.
1662 : */
1663 0 : sp->vgetparent = tif->tif_tagmethods.vgetfield;
1664 0 : tif->tif_tagmethods.vgetfield = LogLuvVGetField; /* hook for codec tags */
1665 0 : sp->vsetparent = tif->tif_tagmethods.vsetfield;
1666 0 : tif->tif_tagmethods.vsetfield = LogLuvVSetField; /* hook for codec tags */
1667 :
1668 0 : return (1);
1669 : bad:
1670 0 : TIFFErrorExt(tif->tif_clientdata, module,
1671 : "%s: No space for LogLuv state block", tif->tif_name);
1672 0 : return (0);
1673 : }
1674 : #endif /* LOGLUV_SUPPORT */
1675 :
1676 : /* vim: set ts=8 sts=8 sw=8 noet: */
1677 : /*
1678 : * Local Variables:
1679 : * mode: c
1680 : * c-basic-offset: 8
1681 : * fill-column: 78
1682 : * End:
1683 : */
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