Visualization Library 2.0.0-b5

A lightweight C++ OpenGL middleware for 2D/3D graphics

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tif_luv.c
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1 /* $Id: tif_luv.c,v 1.17 2006/03/16 12:38:24 dron 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  tidata_t* tbuf; /* translation buffer */
166  int tbuflen; /* buffer length */
167  void (*tfunc)(LogLuvState*, tidata_t, int);
168 
169  TIFFVSetMethod vgetparent; /* super-class method */
170  TIFFVSetMethod vsetparent; /* super-class method */
171 };
172 
173 #define DecoderState(tif) ((LogLuvState*) (tif)->tif_data)
174 #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 LogL16Decode(TIFF* tif, tidata_t op, tsize_t occ, tsample_t s)
185 {
186  LogLuvState* sp = DecoderState(tif);
187  int shft, i, npixels;
188  unsigned char* bp;
189  int16* tp;
190  int16 b;
191  int cc, rc;
192 
193  assert(s == 0);
194  assert(sp != NULL);
195 
196  npixels = occ / sp->pixel_size;
197 
198  if (sp->user_datafmt == SGILOGDATAFMT_16BIT)
199  tp = (int16*) op;
200  else {
201  assert(sp->tbuflen >= npixels);
202  tp = (int16*) sp->tbuf;
203  }
204  _TIFFmemset((tdata_t) tp, 0, npixels*sizeof (tp[0]));
205 
206  bp = (unsigned char*) tif->tif_rawcp;
207  cc = tif->tif_rawcc;
208  /* get each byte string */
209  for (shft = 2*8; (shft -= 8) >= 0; ) {
210  for (i = 0; i < npixels && cc > 0; )
211  if (*bp >= 128) { /* run */
212  rc = *bp++ + (2-128);
213  b = (int16)(*bp++ << shft);
214  cc -= 2;
215  while (rc-- && i < npixels)
216  tp[i++] |= b;
217  } else { /* non-run */
218  rc = *bp++; /* nul is noop */
219  while (--cc && rc-- && i < npixels)
220  tp[i++] |= (int16)*bp++ << shft;
221  }
222  if (i != npixels) {
224  "LogL16Decode: Not enough data at row %d (short %d pixels)",
225  tif->tif_row, npixels - i);
226  tif->tif_rawcp = (tidata_t) bp;
227  tif->tif_rawcc = cc;
228  return (0);
229  }
230  }
231  (*sp->tfunc)(sp, op, npixels);
232  tif->tif_rawcp = (tidata_t) bp;
233  tif->tif_rawcc = cc;
234  return (1);
235 }
236 
237 /*
238  * Decode a string of 24-bit pixels.
239  */
240 static int
241 LogLuvDecode24(TIFF* tif, tidata_t op, tsize_t occ, tsample_t s)
242 {
243  LogLuvState* sp = DecoderState(tif);
244  int cc, i, npixels;
245  unsigned char* bp;
246  uint32* tp;
247 
248  assert(s == 0);
249  assert(sp != NULL);
250 
251  npixels = occ / sp->pixel_size;
252 
253  if (sp->user_datafmt == SGILOGDATAFMT_RAW)
254  tp = (uint32 *)op;
255  else {
256  assert(sp->tbuflen >= npixels);
257  tp = (uint32 *) sp->tbuf;
258  }
259  /* copy to array of uint32 */
260  bp = (unsigned char*) tif->tif_rawcp;
261  cc = tif->tif_rawcc;
262  for (i = 0; i < npixels && cc > 0; i++) {
263  tp[i] = bp[0] << 16 | bp[1] << 8 | bp[2];
264  bp += 3;
265  cc -= 3;
266  }
267  tif->tif_rawcp = (tidata_t) bp;
268  tif->tif_rawcc = cc;
269  if (i != npixels) {
271  "LogLuvDecode24: Not enough data at row %d (short %d pixels)",
272  tif->tif_row, npixels - i);
273  return (0);
274  }
275  (*sp->tfunc)(sp, op, npixels);
276  return (1);
277 }
278 
279 /*
280  * Decode a string of 32-bit pixels.
281  */
282 static int
283 LogLuvDecode32(TIFF* tif, tidata_t op, tsize_t occ, tsample_t s)
284 {
285  LogLuvState* sp;
286  int shft, i, npixels;
287  unsigned char* bp;
288  uint32* tp;
289  uint32 b;
290  int cc, rc;
291 
292  assert(s == 0);
293  sp = DecoderState(tif);
294  assert(sp != NULL);
295 
296  npixels = occ / sp->pixel_size;
297 
298  if (sp->user_datafmt == SGILOGDATAFMT_RAW)
299  tp = (uint32*) op;
300  else {
301  assert(sp->tbuflen >= npixels);
302  tp = (uint32*) sp->tbuf;
303  }
304  _TIFFmemset((tdata_t) tp, 0, npixels*sizeof (tp[0]));
305 
306  bp = (unsigned char*) tif->tif_rawcp;
307  cc = tif->tif_rawcc;
308  /* get each byte string */
309  for (shft = 4*8; (shft -= 8) >= 0; ) {
310  for (i = 0; i < npixels && cc > 0; )
311  if (*bp >= 128) { /* run */
312  rc = *bp++ + (2-128);
313  b = (uint32)*bp++ << shft;
314  cc -= 2;
315  while (rc-- && i < npixels)
316  tp[i++] |= b;
317  } else { /* non-run */
318  rc = *bp++; /* nul is noop */
319  while (--cc && rc-- && i < npixels)
320  tp[i++] |= (uint32)*bp++ << shft;
321  }
322  if (i != npixels) {
324  "LogLuvDecode32: Not enough data at row %d (short %d pixels)",
325  tif->tif_row, npixels - i);
326  tif->tif_rawcp = (tidata_t) bp;
327  tif->tif_rawcc = cc;
328  return (0);
329  }
330  }
331  (*sp->tfunc)(sp, op, npixels);
332  tif->tif_rawcp = (tidata_t) bp;
333  tif->tif_rawcc = cc;
334  return (1);
335 }
336 
337 /*
338  * Decode a strip of pixels. We break it into rows to
339  * maintain synchrony with the encode algorithm, which
340  * is row by row.
341  */
342 static int
343 LogLuvDecodeStrip(TIFF* tif, tidata_t bp, tsize_t cc, tsample_t s)
344 {
345  tsize_t rowlen = TIFFScanlineSize(tif);
346 
347  assert(cc%rowlen == 0);
348  while (cc && (*tif->tif_decoderow)(tif, bp, rowlen, s))
349  bp += rowlen, cc -= rowlen;
350  return (cc == 0);
351 }
352 
353 /*
354  * Decode a tile of pixels. We break it into rows to
355  * maintain synchrony with the encode algorithm, which
356  * is row by row.
357  */
358 static int
359 LogLuvDecodeTile(TIFF* tif, tidata_t bp, tsize_t cc, tsample_t s)
360 {
361  tsize_t rowlen = TIFFTileRowSize(tif);
362 
363  assert(cc%rowlen == 0);
364  while (cc && (*tif->tif_decoderow)(tif, bp, rowlen, s))
365  bp += rowlen, cc -= rowlen;
366  return (cc == 0);
367 }
368 
369 /*
370  * Encode a row of 16-bit pixels.
371  */
372 static int
373 LogL16Encode(TIFF* tif, tidata_t bp, tsize_t cc, tsample_t s)
374 {
375  LogLuvState* sp = EncoderState(tif);
376  int shft, i, j, npixels;
377  tidata_t op;
378  int16* tp;
379  int16 b;
380  int occ, rc=0, mask, beg;
381 
382  assert(s == 0);
383  assert(sp != NULL);
384  npixels = cc / sp->pixel_size;
385 
386  if (sp->user_datafmt == SGILOGDATAFMT_16BIT)
387  tp = (int16*) bp;
388  else {
389  tp = (int16*) sp->tbuf;
390  assert(sp->tbuflen >= npixels);
391  (*sp->tfunc)(sp, bp, npixels);
392  }
393  /* compress each byte string */
394  op = tif->tif_rawcp;
395  occ = tif->tif_rawdatasize - tif->tif_rawcc;
396  for (shft = 2*8; (shft -= 8) >= 0; )
397  for (i = 0; i < npixels; i += rc) {
398  if (occ < 4) {
399  tif->tif_rawcp = op;
400  tif->tif_rawcc = tif->tif_rawdatasize - occ;
401  if (!TIFFFlushData1(tif))
402  return (-1);
403  op = tif->tif_rawcp;
404  occ = tif->tif_rawdatasize - tif->tif_rawcc;
405  }
406  mask = 0xff << shft; /* find next run */
407  for (beg = i; beg < npixels; beg += rc) {
408  b = (int16) (tp[beg] & mask);
409  rc = 1;
410  while (rc < 127+2 && beg+rc < npixels &&
411  (tp[beg+rc] & mask) == b)
412  rc++;
413  if (rc >= MINRUN)
414  break; /* long enough */
415  }
416  if (beg-i > 1 && beg-i < MINRUN) {
417  b = (int16) (tp[i] & mask);/*check short run */
418  j = i+1;
419  while ((tp[j++] & mask) == b)
420  if (j == beg) {
421  *op++ = (tidataval_t)(128-2+j-i);
422  *op++ = (tidataval_t) (b >> shft);
423  occ -= 2;
424  i = beg;
425  break;
426  }
427  }
428  while (i < beg) { /* write out non-run */
429  if ((j = beg-i) > 127) j = 127;
430  if (occ < j+3) {
431  tif->tif_rawcp = op;
432  tif->tif_rawcc = tif->tif_rawdatasize - occ;
433  if (!TIFFFlushData1(tif))
434  return (-1);
435  op = tif->tif_rawcp;
436  occ = tif->tif_rawdatasize - tif->tif_rawcc;
437  }
438  *op++ = (tidataval_t) j; occ--;
439  while (j--) {
440  *op++ = (tidataval_t) (tp[i++] >> shft & 0xff);
441  occ--;
442  }
443  }
444  if (rc >= MINRUN) { /* write out run */
445  *op++ = (tidataval_t) (128-2+rc);
446  *op++ = (tidataval_t) (tp[beg] >> shft & 0xff);
447  occ -= 2;
448  } else
449  rc = 0;
450  }
451  tif->tif_rawcp = op;
452  tif->tif_rawcc = tif->tif_rawdatasize - occ;
453 
454  return (0);
455 }
456 
457 /*
458  * Encode a row of 24-bit pixels.
459  */
460 static int
461 LogLuvEncode24(TIFF* tif, tidata_t bp, tsize_t cc, tsample_t s)
462 {
463  LogLuvState* sp = EncoderState(tif);
464  int i, npixels, occ;
465  tidata_t op;
466  uint32* tp;
467 
468  assert(s == 0);
469  assert(sp != NULL);
470  npixels = cc / sp->pixel_size;
471 
472  if (sp->user_datafmt == SGILOGDATAFMT_RAW)
473  tp = (uint32*) bp;
474  else {
475  tp = (uint32*) sp->tbuf;
476  assert(sp->tbuflen >= npixels);
477  (*sp->tfunc)(sp, bp, npixels);
478  }
479  /* write out encoded pixels */
480  op = tif->tif_rawcp;
481  occ = tif->tif_rawdatasize - tif->tif_rawcc;
482  for (i = npixels; i--; ) {
483  if (occ < 3) {
484  tif->tif_rawcp = op;
485  tif->tif_rawcc = tif->tif_rawdatasize - occ;
486  if (!TIFFFlushData1(tif))
487  return (-1);
488  op = tif->tif_rawcp;
489  occ = tif->tif_rawdatasize - tif->tif_rawcc;
490  }
491  *op++ = (tidataval_t)(*tp >> 16);
492  *op++ = (tidataval_t)(*tp >> 8 & 0xff);
493  *op++ = (tidataval_t)(*tp++ & 0xff);
494  occ -= 3;
495  }
496  tif->tif_rawcp = op;
497  tif->tif_rawcc = tif->tif_rawdatasize - occ;
498 
499  return (0);
500 }
501 
502 /*
503  * Encode a row of 32-bit pixels.
504  */
505 static int
506 LogLuvEncode32(TIFF* tif, tidata_t bp, tsize_t cc, tsample_t s)
507 {
508  LogLuvState* sp = EncoderState(tif);
509  int shft, i, j, npixels;
510  tidata_t op;
511  uint32* tp;
512  uint32 b;
513  int occ, rc=0, mask, beg;
514 
515  assert(s == 0);
516  assert(sp != NULL);
517 
518  npixels = cc / sp->pixel_size;
519 
520  if (sp->user_datafmt == SGILOGDATAFMT_RAW)
521  tp = (uint32*) bp;
522  else {
523  tp = (uint32*) sp->tbuf;
524  assert(sp->tbuflen >= npixels);
525  (*sp->tfunc)(sp, bp, npixels);
526  }
527  /* compress each byte string */
528  op = tif->tif_rawcp;
529  occ = tif->tif_rawdatasize - tif->tif_rawcc;
530  for (shft = 4*8; (shft -= 8) >= 0; )
531  for (i = 0; i < npixels; i += rc) {
532  if (occ < 4) {
533  tif->tif_rawcp = op;
534  tif->tif_rawcc = tif->tif_rawdatasize - occ;
535  if (!TIFFFlushData1(tif))
536  return (-1);
537  op = tif->tif_rawcp;
538  occ = tif->tif_rawdatasize - tif->tif_rawcc;
539  }
540  mask = 0xff << shft; /* find next run */
541  for (beg = i; beg < npixels; beg += rc) {
542  b = tp[beg] & mask;
543  rc = 1;
544  while (rc < 127+2 && beg+rc < npixels &&
545  (tp[beg+rc] & mask) == b)
546  rc++;
547  if (rc >= MINRUN)
548  break; /* long enough */
549  }
550  if (beg-i > 1 && beg-i < MINRUN) {
551  b = tp[i] & mask; /* check short run */
552  j = i+1;
553  while ((tp[j++] & mask) == b)
554  if (j == beg) {
555  *op++ = (tidataval_t)(128-2+j-i);
556  *op++ = (tidataval_t)(b >> shft);
557  occ -= 2;
558  i = beg;
559  break;
560  }
561  }
562  while (i < beg) { /* write out non-run */
563  if ((j = beg-i) > 127) j = 127;
564  if (occ < j+3) {
565  tif->tif_rawcp = op;
566  tif->tif_rawcc = tif->tif_rawdatasize - occ;
567  if (!TIFFFlushData1(tif))
568  return (-1);
569  op = tif->tif_rawcp;
570  occ = tif->tif_rawdatasize - tif->tif_rawcc;
571  }
572  *op++ = (tidataval_t) j; occ--;
573  while (j--) {
574  *op++ = (tidataval_t)(tp[i++] >> shft & 0xff);
575  occ--;
576  }
577  }
578  if (rc >= MINRUN) { /* write out run */
579  *op++ = (tidataval_t) (128-2+rc);
580  *op++ = (tidataval_t)(tp[beg] >> shft & 0xff);
581  occ -= 2;
582  } else
583  rc = 0;
584  }
585  tif->tif_rawcp = op;
586  tif->tif_rawcc = tif->tif_rawdatasize - occ;
587 
588  return (0);
589 }
590 
591 /*
592  * Encode a strip of pixels. We break it into rows to
593  * avoid encoding runs across row boundaries.
594  */
595 static int
596 LogLuvEncodeStrip(TIFF* tif, tidata_t bp, tsize_t cc, tsample_t s)
597 {
598  tsize_t rowlen = TIFFScanlineSize(tif);
599 
600  assert(cc%rowlen == 0);
601  while (cc && (*tif->tif_encoderow)(tif, bp, rowlen, s) == 0)
602  bp += rowlen, cc -= rowlen;
603  return (cc == 0);
604 }
605 
606 /*
607  * Encode a tile of pixels. We break it into rows to
608  * avoid encoding runs across row boundaries.
609  */
610 static int
611 LogLuvEncodeTile(TIFF* tif, tidata_t bp, tsize_t cc, tsample_t s)
612 {
613  tsize_t rowlen = TIFFTileRowSize(tif);
614 
615  assert(cc%rowlen == 0);
616  while (cc && (*tif->tif_encoderow)(tif, bp, rowlen, s) == 0)
617  bp += rowlen, cc -= rowlen;
618  return (cc == 0);
619 }
620 
621 /*
622  * Encode/Decode functions for converting to and from user formats.
623  */
624 
625 #include "uvcode.h"
626 
627 #ifndef UVSCALE
628 #define U_NEU 0.210526316
629 #define V_NEU 0.473684211
630 #define UVSCALE 410.
631 #endif
632 
633 #ifndef M_LN2
634 #define M_LN2 0.69314718055994530942
635 #endif
636 #ifndef M_PI
637 #define M_PI 3.14159265358979323846
638 #endif
639 #define log2(x) ((1./M_LN2)*log(x))
640 #define exp2(x) exp(M_LN2*(x))
641 
642 #define itrunc(x,m) ((m)==SGILOGENCODE_NODITHER ? \
643  (int)(x) : \
644  (int)((x) + rand()*(1./RAND_MAX) - .5))
645 
646 #if !LOGLUV_PUBLIC
647 static
648 #endif
649 double
650 LogL16toY(int p16) /* compute luminance from 16-bit LogL */
651 {
652  int Le = p16 & 0x7fff;
653  double Y;
654 
655  if (!Le)
656  return (0.);
657  Y = exp(M_LN2/256.*(Le+.5) - M_LN2*64.);
658  return (!(p16 & 0x8000) ? Y : -Y);
659 }
660 
661 #if !LOGLUV_PUBLIC
662 static
663 #endif
664 int
665 LogL16fromY(double Y, int em) /* get 16-bit LogL from Y */
666 {
667  if (Y >= 1.8371976e19)
668  return (0x7fff);
669  if (Y <= -1.8371976e19)
670  return (0xffff);
671  if (Y > 5.4136769e-20)
672  return itrunc(256.*(log2(Y) + 64.), em);
673  if (Y < -5.4136769e-20)
674  return (~0x7fff | itrunc(256.*(log2(-Y) + 64.), em));
675  return (0);
676 }
677 
678 static void
679 L16toY(LogLuvState* sp, tidata_t op, int n)
680 {
681  int16* l16 = (int16*) sp->tbuf;
682  float* yp = (float*) op;
683 
684  while (n-- > 0)
685  *yp++ = (float)LogL16toY(*l16++);
686 }
687 
688 static void
689 L16toGry(LogLuvState* sp, tidata_t op, int n)
690 {
691  int16* l16 = (int16*) sp->tbuf;
692  uint8* gp = (uint8*) op;
693 
694  while (n-- > 0) {
695  double Y = LogL16toY(*l16++);
696  *gp++ = (uint8) ((Y <= 0.) ? 0 : (Y >= 1.) ? 255 : (int)(256.*sqrt(Y)));
697  }
698 }
699 
700 static void
701 L16fromY(LogLuvState* sp, tidata_t op, int n)
702 {
703  int16* l16 = (int16*) sp->tbuf;
704  float* yp = (float*) op;
705 
706  while (n-- > 0)
707  *l16++ = (int16) (LogL16fromY(*yp++, sp->encode_meth));
708 }
709 
710 #if !LOGLUV_PUBLIC
711 static
712 #endif
713 void
714 XYZtoRGB24(float xyz[3], uint8 rgb[3])
715 {
716  double r, g, b;
717  /* assume CCIR-709 primaries */
718  r = 2.690*xyz[0] + -1.276*xyz[1] + -0.414*xyz[2];
719  g = -1.022*xyz[0] + 1.978*xyz[1] + 0.044*xyz[2];
720  b = 0.061*xyz[0] + -0.224*xyz[1] + 1.163*xyz[2];
721  /* assume 2.0 gamma for speed */
722  /* could use integer sqrt approx., but this is probably faster */
723  rgb[0] = (uint8)((r<=0.) ? 0 : (r >= 1.) ? 255 : (int)(256.*sqrt(r)));
724  rgb[1] = (uint8)((g<=0.) ? 0 : (g >= 1.) ? 255 : (int)(256.*sqrt(g)));
725  rgb[2] = (uint8)((b<=0.) ? 0 : (b >= 1.) ? 255 : (int)(256.*sqrt(b)));
726 }
727 
728 #if !LOGLUV_PUBLIC
729 static
730 #endif
731 double
732 LogL10toY(int p10) /* compute luminance from 10-bit LogL */
733 {
734  if (p10 == 0)
735  return (0.);
736  return (exp(M_LN2/64.*(p10+.5) - M_LN2*12.));
737 }
738 
739 #if !LOGLUV_PUBLIC
740 static
741 #endif
742 int
743 LogL10fromY(double Y, int em) /* get 10-bit LogL from Y */
744 {
745  if (Y >= 15.742)
746  return (0x3ff);
747  else if (Y <= .00024283)
748  return (0);
749  else
750  return itrunc(64.*(log2(Y) + 12.), em);
751 }
752 
753 #define NANGLES 100
754 #define uv2ang(u, v) ( (NANGLES*.499999999/M_PI) \
755  * atan2((v)-V_NEU,(u)-U_NEU) + .5*NANGLES )
756 
757 static int
758 oog_encode(double u, double v) /* encode out-of-gamut chroma */
759 {
760  static int oog_table[NANGLES];
761  static int initialized = 0;
762  register int i;
763 
764  if (!initialized) { /* set up perimeter table */
765  double eps[NANGLES], ua, va, ang, epsa;
766  int ui, vi, ustep;
767  for (i = NANGLES; i--; )
768  eps[i] = 2.;
769  for (vi = UV_NVS; vi--; ) {
770  va = UV_VSTART + (vi+.5)*UV_SQSIZ;
771  ustep = uv_row[vi].nus-1;
772  if (vi == UV_NVS-1 || vi == 0 || ustep <= 0)
773  ustep = 1;
774  for (ui = uv_row[vi].nus-1; ui >= 0; ui -= ustep) {
775  ua = uv_row[vi].ustart + (ui+.5)*UV_SQSIZ;
776  ang = uv2ang(ua, va);
777  i = (int) ang;
778  epsa = fabs(ang - (i+.5));
779  if (epsa < eps[i]) {
780  oog_table[i] = uv_row[vi].ncum + ui;
781  eps[i] = epsa;
782  }
783  }
784  }
785  for (i = NANGLES; i--; ) /* fill any holes */
786  if (eps[i] > 1.5) {
787  int i1, i2;
788  for (i1 = 1; i1 < NANGLES/2; i1++)
789  if (eps[(i+i1)%NANGLES] < 1.5)
790  break;
791  for (i2 = 1; i2 < NANGLES/2; i2++)
792  if (eps[(i+NANGLES-i2)%NANGLES] < 1.5)
793  break;
794  if (i1 < i2)
795  oog_table[i] =
796  oog_table[(i+i1)%NANGLES];
797  else
798  oog_table[i] =
799  oog_table[(i+NANGLES-i2)%NANGLES];
800  }
801  initialized = 1;
802  }
803  i = (int) uv2ang(u, v); /* look up hue angle */
804  return (oog_table[i]);
805 }
806 
807 #undef uv2ang
808 #undef NANGLES
809 
810 #if !LOGLUV_PUBLIC
811 static
812 #endif
813 int
814 uv_encode(double u, double v, int em) /* encode (u',v') coordinates */
815 {
816  register int vi, ui;
817 
818  if (v < UV_VSTART)
819  return oog_encode(u, v);
820  vi = itrunc((v - UV_VSTART)*(1./UV_SQSIZ), em);
821  if (vi >= UV_NVS)
822  return oog_encode(u, v);
823  if (u < uv_row[vi].ustart)
824  return oog_encode(u, v);
825  ui = itrunc((u - uv_row[vi].ustart)*(1./UV_SQSIZ), em);
826  if (ui >= uv_row[vi].nus)
827  return oog_encode(u, v);
828 
829  return (uv_row[vi].ncum + ui);
830 }
831 
832 #if !LOGLUV_PUBLIC
833 static
834 #endif
835 int
836 uv_decode(double *up, double *vp, int c) /* decode (u',v') index */
837 {
838  int upper, lower;
839  register int ui, vi;
840 
841  if (c < 0 || c >= UV_NDIVS)
842  return (-1);
843  lower = 0; /* binary search */
844  upper = UV_NVS;
845  while (upper - lower > 1) {
846  vi = (lower + upper) >> 1;
847  ui = c - uv_row[vi].ncum;
848  if (ui > 0)
849  lower = vi;
850  else if (ui < 0)
851  upper = vi;
852  else {
853  lower = vi;
854  break;
855  }
856  }
857  vi = lower;
858  ui = c - uv_row[vi].ncum;
859  *up = uv_row[vi].ustart + (ui+.5)*UV_SQSIZ;
860  *vp = UV_VSTART + (vi+.5)*UV_SQSIZ;
861  return (0);
862 }
863 
864 #if !LOGLUV_PUBLIC
865 static
866 #endif
867 void
868 LogLuv24toXYZ(uint32 p, float XYZ[3])
869 {
870  int Ce;
871  double L, u, v, s, x, y;
872  /* decode luminance */
873  L = LogL10toY(p>>14 & 0x3ff);
874  if (L <= 0.) {
875  XYZ[0] = XYZ[1] = XYZ[2] = 0.;
876  return;
877  }
878  /* decode color */
879  Ce = p & 0x3fff;
880  if (uv_decode(&u, &v, Ce) < 0) {
881  u = U_NEU; v = V_NEU;
882  }
883  s = 1./(6.*u - 16.*v + 12.);
884  x = 9.*u * s;
885  y = 4.*v * s;
886  /* convert to XYZ */
887  XYZ[0] = (float)(x/y * L);
888  XYZ[1] = (float)L;
889  XYZ[2] = (float)((1.-x-y)/y * L);
890 }
891 
892 #if !LOGLUV_PUBLIC
893 static
894 #endif
895 uint32
896 LogLuv24fromXYZ(float XYZ[3], int em)
897 {
898  int Le, Ce;
899  double u, v, s;
900  /* encode luminance */
901  Le = LogL10fromY(XYZ[1], em);
902  /* encode color */
903  s = XYZ[0] + 15.*XYZ[1] + 3.*XYZ[2];
904  if (!Le || s <= 0.) {
905  u = U_NEU;
906  v = V_NEU;
907  } else {
908  u = 4.*XYZ[0] / s;
909  v = 9.*XYZ[1] / s;
910  }
911  Ce = uv_encode(u, v, em);
912  if (Ce < 0) /* never happens */
914  /* combine encodings */
915  return (Le << 14 | Ce);
916 }
917 
918 static void
919 Luv24toXYZ(LogLuvState* sp, tidata_t op, int n)
920 {
921  uint32* luv = (uint32*) sp->tbuf;
922  float* xyz = (float*) op;
923 
924  while (n-- > 0) {
925  LogLuv24toXYZ(*luv, xyz);
926  xyz += 3;
927  luv++;
928  }
929 }
930 
931 static void
932 Luv24toLuv48(LogLuvState* sp, tidata_t op, int n)
933 {
934  uint32* luv = (uint32*) sp->tbuf;
935  int16* luv3 = (int16*) op;
936 
937  while (n-- > 0) {
938  double u, v;
939 
940  *luv3++ = (int16)((*luv >> 12 & 0xffd) + 13314);
941  if (uv_decode(&u, &v, *luv&0x3fff) < 0) {
942  u = U_NEU;
943  v = V_NEU;
944  }
945  *luv3++ = (int16)(u * (1L<<15));
946  *luv3++ = (int16)(v * (1L<<15));
947  luv++;
948  }
949 }
950 
951 static void
952 Luv24toRGB(LogLuvState* sp, tidata_t op, int n)
953 {
954  uint32* luv = (uint32*) sp->tbuf;
955  uint8* rgb = (uint8*) op;
956 
957  while (n-- > 0) {
958  float xyz[3];
959 
960  LogLuv24toXYZ(*luv++, xyz);
961  XYZtoRGB24(xyz, rgb);
962  rgb += 3;
963  }
964 }
965 
966 static void
967 Luv24fromXYZ(LogLuvState* sp, tidata_t op, int n)
968 {
969  uint32* luv = (uint32*) sp->tbuf;
970  float* xyz = (float*) op;
971 
972  while (n-- > 0) {
973  *luv++ = LogLuv24fromXYZ(xyz, sp->encode_meth);
974  xyz += 3;
975  }
976 }
977 
978 static void
979 Luv24fromLuv48(LogLuvState* sp, tidata_t op, int n)
980 {
981  uint32* luv = (uint32*) sp->tbuf;
982  int16* luv3 = (int16*) op;
983 
984  while (n-- > 0) {
985  int Le, Ce;
986 
987  if (luv3[0] <= 0)
988  Le = 0;
989  else if (luv3[0] >= (1<<12)+3314)
990  Le = (1<<10) - 1;
991  else if (sp->encode_meth == SGILOGENCODE_NODITHER)
992  Le = (luv3[0]-3314) >> 2;
993  else
994  Le = itrunc(.25*(luv3[0]-3314.), sp->encode_meth);
995 
996  Ce = uv_encode((luv3[1]+.5)/(1<<15), (luv3[2]+.5)/(1<<15),
997  sp->encode_meth);
998  if (Ce < 0) /* never happens */
1000  *luv++ = (uint32)Le << 14 | Ce;
1001  luv3 += 3;
1002  }
1003 }
1004 
1005 #if !LOGLUV_PUBLIC
1006 static
1007 #endif
1008 void
1009 LogLuv32toXYZ(uint32 p, float XYZ[3])
1010 {
1011  double L, u, v, s, x, y;
1012  /* decode luminance */
1013  L = LogL16toY((int)p >> 16);
1014  if (L <= 0.) {
1015  XYZ[0] = XYZ[1] = XYZ[2] = 0.;
1016  return;
1017  }
1018  /* decode color */
1019  u = 1./UVSCALE * ((p>>8 & 0xff) + .5);
1020  v = 1./UVSCALE * ((p & 0xff) + .5);
1021  s = 1./(6.*u - 16.*v + 12.);
1022  x = 9.*u * s;
1023  y = 4.*v * s;
1024  /* convert to XYZ */
1025  XYZ[0] = (float)(x/y * L);
1026  XYZ[1] = (float)L;
1027  XYZ[2] = (float)((1.-x-y)/y * L);
1028 }
1029 
1030 #if !LOGLUV_PUBLIC
1031 static
1032 #endif
1033 uint32
1034 LogLuv32fromXYZ(float XYZ[3], int em)
1035 {
1036  unsigned int Le, ue, ve;
1037  double u, v, s;
1038  /* encode luminance */
1039  Le = (unsigned int)LogL16fromY(XYZ[1], em);
1040  /* encode color */
1041  s = XYZ[0] + 15.*XYZ[1] + 3.*XYZ[2];
1042  if (!Le || s <= 0.) {
1043  u = U_NEU;
1044  v = V_NEU;
1045  } else {
1046  u = 4.*XYZ[0] / s;
1047  v = 9.*XYZ[1] / s;
1048  }
1049  if (u <= 0.) ue = 0;
1050  else ue = itrunc(UVSCALE*u, em);
1051  if (ue > 255) ue = 255;
1052  if (v <= 0.) ve = 0;
1053  else ve = itrunc(UVSCALE*v, em);
1054  if (ve > 255) ve = 255;
1055  /* combine encodings */
1056  return (Le << 16 | ue << 8 | ve);
1057 }
1058 
1059 static void
1060 Luv32toXYZ(LogLuvState* sp, tidata_t op, int n)
1061 {
1062  uint32* luv = (uint32*) sp->tbuf;
1063  float* xyz = (float*) op;
1064 
1065  while (n-- > 0) {
1066  LogLuv32toXYZ(*luv++, xyz);
1067  xyz += 3;
1068  }
1069 }
1070 
1071 static void
1072 Luv32toLuv48(LogLuvState* sp, tidata_t op, int n)
1073 {
1074  uint32* luv = (uint32*) sp->tbuf;
1075  int16* luv3 = (int16*) op;
1076 
1077  while (n-- > 0) {
1078  double u, v;
1079 
1080  *luv3++ = (int16)(*luv >> 16);
1081  u = 1./UVSCALE * ((*luv>>8 & 0xff) + .5);
1082  v = 1./UVSCALE * ((*luv & 0xff) + .5);
1083  *luv3++ = (int16)(u * (1L<<15));
1084  *luv3++ = (int16)(v * (1L<<15));
1085  luv++;
1086  }
1087 }
1088 
1089 static void
1090 Luv32toRGB(LogLuvState* sp, tidata_t op, int n)
1091 {
1092  uint32* luv = (uint32*) sp->tbuf;
1093  uint8* rgb = (uint8*) op;
1094 
1095  while (n-- > 0) {
1096  float xyz[3];
1097 
1098  LogLuv32toXYZ(*luv++, xyz);
1099  XYZtoRGB24(xyz, rgb);
1100  rgb += 3;
1101  }
1102 }
1103 
1104 static void
1105 Luv32fromXYZ(LogLuvState* sp, tidata_t op, int n)
1106 {
1107  uint32* luv = (uint32*) sp->tbuf;
1108  float* xyz = (float*) op;
1109 
1110  while (n-- > 0) {
1111  *luv++ = LogLuv32fromXYZ(xyz, sp->encode_meth);
1112  xyz += 3;
1113  }
1114 }
1115 
1116 static void
1117 Luv32fromLuv48(LogLuvState* sp, tidata_t op, int n)
1118 {
1119  uint32* luv = (uint32*) sp->tbuf;
1120  int16* luv3 = (int16*) op;
1121 
1122  if (sp->encode_meth == SGILOGENCODE_NODITHER) {
1123  while (n-- > 0) {
1124  *luv++ = (uint32)luv3[0] << 16 |
1125  (luv3[1]*(uint32)(UVSCALE+.5) >> 7 & 0xff00) |
1126  (luv3[2]*(uint32)(UVSCALE+.5) >> 15 & 0xff);
1127  luv3 += 3;
1128  }
1129  return;
1130  }
1131  while (n-- > 0) {
1132  *luv++ = (uint32)luv3[0] << 16 |
1133  (itrunc(luv3[1]*(UVSCALE/(1<<15)), sp->encode_meth) << 8 & 0xff00) |
1134  (itrunc(luv3[2]*(UVSCALE/(1<<15)), sp->encode_meth) & 0xff);
1135  luv3 += 3;
1136  }
1137 }
1138 
1139 static void
1140 _logLuvNop(LogLuvState* sp, tidata_t op, int n)
1141 {
1142  (void) sp; (void) op; (void) n;
1143 }
1144 
1145 static int
1146 LogL16GuessDataFmt(TIFFDirectory *td)
1147 {
1148 #define PACK(s,b,f) (((b)<<6)|((s)<<3)|(f))
1149  switch (PACK(td->td_samplesperpixel, td->td_bitspersample, td->td_sampleformat)) {
1150  case PACK(1, 32, SAMPLEFORMAT_IEEEFP):
1151  return (SGILOGDATAFMT_FLOAT);
1152  case PACK(1, 16, SAMPLEFORMAT_VOID):
1153  case PACK(1, 16, SAMPLEFORMAT_INT):
1154  case PACK(1, 16, SAMPLEFORMAT_UINT):
1155  return (SGILOGDATAFMT_16BIT);
1156  case PACK(1, 8, SAMPLEFORMAT_VOID):
1157  case PACK(1, 8, SAMPLEFORMAT_UINT):
1158  return (SGILOGDATAFMT_8BIT);
1159  }
1160 #undef PACK
1161  return (SGILOGDATAFMT_UNKNOWN);
1162 }
1163 
1164 static uint32
1165 multiply(size_t m1, size_t m2)
1166 {
1167  uint32 bytes = m1 * m2;
1168 
1169  if (m1 && bytes / m1 != m2)
1170  bytes = 0;
1171 
1172  return bytes;
1173 }
1174 
1175 static int
1176 LogL16InitState(TIFF* tif)
1177 {
1178  TIFFDirectory *td = &tif->tif_dir;
1179  LogLuvState* sp = DecoderState(tif);
1180  static const char module[] = "LogL16InitState";
1181 
1182  assert(sp != NULL);
1183  assert(td->td_photometric == PHOTOMETRIC_LOGL);
1184 
1185  /* for some reason, we can't do this in TIFFInitLogL16 */
1186  if (sp->user_datafmt == SGILOGDATAFMT_UNKNOWN)
1187  sp->user_datafmt = LogL16GuessDataFmt(td);
1188  switch (sp->user_datafmt) {
1189  case SGILOGDATAFMT_FLOAT:
1190  sp->pixel_size = sizeof (float);
1191  break;
1192  case SGILOGDATAFMT_16BIT:
1193  sp->pixel_size = sizeof (int16);
1194  break;
1195  case SGILOGDATAFMT_8BIT:
1196  sp->pixel_size = sizeof (uint8);
1197  break;
1198  default:
1200  "No support for converting user data format to LogL");
1201  return (0);
1202  }
1203  sp->tbuflen = multiply(td->td_imagewidth, td->td_rowsperstrip);
1204  if (multiply(sp->tbuflen, sizeof (int16)) == 0 ||
1205  (sp->tbuf = (tidata_t*) _TIFFmalloc(sp->tbuflen * sizeof (int16))) == NULL) {
1206  TIFFErrorExt(tif->tif_clientdata, module, "%s: No space for SGILog translation buffer",
1207  tif->tif_name);
1208  return (0);
1209  }
1210  return (1);
1211 }
1212 
1213 static int
1214 LogLuvGuessDataFmt(TIFFDirectory *td)
1215 {
1216  int guess;
1217 
1218  /*
1219  * If the user didn't tell us their datafmt,
1220  * take our best guess from the bitspersample.
1221  */
1222 #define PACK(a,b) (((a)<<3)|(b))
1223  switch (PACK(td->td_bitspersample, td->td_sampleformat)) {
1224  case PACK(32, SAMPLEFORMAT_IEEEFP):
1225  guess = SGILOGDATAFMT_FLOAT;
1226  break;
1227  case PACK(32, SAMPLEFORMAT_VOID):
1228  case PACK(32, SAMPLEFORMAT_UINT):
1229  case PACK(32, SAMPLEFORMAT_INT):
1230  guess = SGILOGDATAFMT_RAW;
1231  break;
1232  case PACK(16, SAMPLEFORMAT_VOID):
1233  case PACK(16, SAMPLEFORMAT_INT):
1234  case PACK(16, SAMPLEFORMAT_UINT):
1235  guess = SGILOGDATAFMT_16BIT;
1236  break;
1237  case PACK( 8, SAMPLEFORMAT_VOID):
1238  case PACK( 8, SAMPLEFORMAT_UINT):
1239  guess = SGILOGDATAFMT_8BIT;
1240  break;
1241  default:
1242  guess = SGILOGDATAFMT_UNKNOWN;
1243  break;
1244 #undef PACK
1245  }
1246  /*
1247  * Double-check samples per pixel.
1248  */
1249  switch (td->td_samplesperpixel) {
1250  case 1:
1251  if (guess != SGILOGDATAFMT_RAW)
1252  guess = SGILOGDATAFMT_UNKNOWN;
1253  break;
1254  case 3:
1255  if (guess == SGILOGDATAFMT_RAW)
1256  guess = SGILOGDATAFMT_UNKNOWN;
1257  break;
1258  default:
1259  guess = SGILOGDATAFMT_UNKNOWN;
1260  break;
1261  }
1262  return (guess);
1263 }
1264 
1265 static int
1266 LogLuvInitState(TIFF* tif)
1267 {
1268  TIFFDirectory* td = &tif->tif_dir;
1269  LogLuvState* sp = DecoderState(tif);
1270  static const char module[] = "LogLuvInitState";
1271 
1272  assert(sp != NULL);
1273  assert(td->td_photometric == PHOTOMETRIC_LOGLUV);
1274 
1275  /* for some reason, we can't do this in TIFFInitLogLuv */
1276  if (td->td_planarconfig != PLANARCONFIG_CONTIG) {
1277  TIFFErrorExt(tif->tif_clientdata, module,
1278  "SGILog compression cannot handle non-contiguous data");
1279  return (0);
1280  }
1281  if (sp->user_datafmt == SGILOGDATAFMT_UNKNOWN)
1282  sp->user_datafmt = LogLuvGuessDataFmt(td);
1283  switch (sp->user_datafmt) {
1284  case SGILOGDATAFMT_FLOAT:
1285  sp->pixel_size = 3*sizeof (float);
1286  break;
1287  case SGILOGDATAFMT_16BIT:
1288  sp->pixel_size = 3*sizeof (int16);
1289  break;
1290  case SGILOGDATAFMT_RAW:
1291  sp->pixel_size = sizeof (uint32);
1292  break;
1293  case SGILOGDATAFMT_8BIT:
1294  sp->pixel_size = 3*sizeof (uint8);
1295  break;
1296  default:
1298  "No support for converting user data format to LogLuv");
1299  return (0);
1300  }
1301  sp->tbuflen = multiply(td->td_imagewidth, td->td_rowsperstrip);
1302  if (multiply(sp->tbuflen, sizeof (uint32)) == 0 ||
1303  (sp->tbuf = (tidata_t*) _TIFFmalloc(sp->tbuflen * sizeof (uint32))) == NULL) {
1304  TIFFErrorExt(tif->tif_clientdata, module, "%s: No space for SGILog translation buffer",
1305  tif->tif_name);
1306  return (0);
1307  }
1308  return (1);
1309 }
1310 
1311 static int
1312 LogLuvSetupDecode(TIFF* tif)
1313 {
1314  LogLuvState* sp = DecoderState(tif);
1315  TIFFDirectory* td = &tif->tif_dir;
1316 
1318  switch (td->td_photometric) {
1319  case PHOTOMETRIC_LOGLUV:
1320  if (!LogLuvInitState(tif))
1321  break;
1322  if (td->td_compression == COMPRESSION_SGILOG24) {
1323  tif->tif_decoderow = LogLuvDecode24;
1324  switch (sp->user_datafmt) {
1325  case SGILOGDATAFMT_FLOAT:
1326  sp->tfunc = Luv24toXYZ;
1327  break;
1328  case SGILOGDATAFMT_16BIT:
1329  sp->tfunc = Luv24toLuv48;
1330  break;
1331  case SGILOGDATAFMT_8BIT:
1332  sp->tfunc = Luv24toRGB;
1333  break;
1334  }
1335  } else {
1336  tif->tif_decoderow = LogLuvDecode32;
1337  switch (sp->user_datafmt) {
1338  case SGILOGDATAFMT_FLOAT:
1339  sp->tfunc = Luv32toXYZ;
1340  break;
1341  case SGILOGDATAFMT_16BIT:
1342  sp->tfunc = Luv32toLuv48;
1343  break;
1344  case SGILOGDATAFMT_8BIT:
1345  sp->tfunc = Luv32toRGB;
1346  break;
1347  }
1348  }
1349  return (1);
1350  case PHOTOMETRIC_LOGL:
1351  if (!LogL16InitState(tif))
1352  break;
1353  tif->tif_decoderow = LogL16Decode;
1354  switch (sp->user_datafmt) {
1355  case SGILOGDATAFMT_FLOAT:
1356  sp->tfunc = L16toY;
1357  break;
1358  case SGILOGDATAFMT_8BIT:
1359  sp->tfunc = L16toGry;
1360  break;
1361  }
1362  return (1);
1363  default:
1365  "Inappropriate photometric interpretation %d for SGILog compression; %s",
1366  td->td_photometric, "must be either LogLUV or LogL");
1367  break;
1368  }
1369  return (0);
1370 }
1371 
1372 static int
1373 LogLuvSetupEncode(TIFF* tif)
1374 {
1375  LogLuvState* sp = EncoderState(tif);
1376  TIFFDirectory* td = &tif->tif_dir;
1377 
1378  switch (td->td_photometric) {
1379  case PHOTOMETRIC_LOGLUV:
1380  if (!LogLuvInitState(tif))
1381  break;
1382  if (td->td_compression == COMPRESSION_SGILOG24) {
1383  tif->tif_encoderow = LogLuvEncode24;
1384  switch (sp->user_datafmt) {
1385  case SGILOGDATAFMT_FLOAT:
1386  sp->tfunc = Luv24fromXYZ;
1387  break;
1388  case SGILOGDATAFMT_16BIT:
1389  sp->tfunc = Luv24fromLuv48;
1390  break;
1391  case SGILOGDATAFMT_RAW:
1392  break;
1393  default:
1394  goto notsupported;
1395  }
1396  } else {
1397  tif->tif_encoderow = LogLuvEncode32;
1398  switch (sp->user_datafmt) {
1399  case SGILOGDATAFMT_FLOAT:
1400  sp->tfunc = Luv32fromXYZ;
1401  break;
1402  case SGILOGDATAFMT_16BIT:
1403  sp->tfunc = Luv32fromLuv48;
1404  break;
1405  case SGILOGDATAFMT_RAW:
1406  break;
1407  default:
1408  goto notsupported;
1409  }
1410  }
1411  break;
1412  case PHOTOMETRIC_LOGL:
1413  if (!LogL16InitState(tif))
1414  break;
1415  tif->tif_encoderow = LogL16Encode;
1416  switch (sp->user_datafmt) {
1417  case SGILOGDATAFMT_FLOAT:
1418  sp->tfunc = L16fromY;
1419  break;
1420  case SGILOGDATAFMT_16BIT:
1421  break;
1422  default:
1423  goto notsupported;
1424  }
1425  break;
1426  default:
1428  "Inappropriate photometric interpretation %d for SGILog compression; %s",
1429  td->td_photometric, "must be either LogLUV or LogL");
1430  break;
1431  }
1432  return (1);
1433 notsupported:
1435  "SGILog compression supported only for %s, or raw data",
1436  td->td_photometric == PHOTOMETRIC_LOGL ? "Y, L" : "XYZ, Luv");
1437  return (0);
1438 }
1439 
1440 static void
1441 LogLuvClose(TIFF* tif)
1442 {
1443  TIFFDirectory *td = &tif->tif_dir;
1444 
1445  /*
1446  * For consistency, we always want to write out the same
1447  * bitspersample and sampleformat for our TIFF file,
1448  * regardless of the data format being used by the application.
1449  * Since this routine is called after tags have been set but
1450  * before they have been recorded in the file, we reset them here.
1451  */
1452  td->td_samplesperpixel =
1453  (td->td_photometric == PHOTOMETRIC_LOGL) ? 1 : 3;
1454  td->td_bitspersample = 16;
1456 }
1457 
1458 static void
1459 LogLuvCleanup(TIFF* tif)
1460 {
1461  LogLuvState* sp = (LogLuvState *)tif->tif_data;
1462 
1463  assert(sp != 0);
1464 
1465  tif->tif_tagmethods.vgetfield = sp->vgetparent;
1466  tif->tif_tagmethods.vsetfield = sp->vsetparent;
1467 
1468  if (sp->tbuf)
1469  _TIFFfree(sp->tbuf);
1470  _TIFFfree(sp);
1471  tif->tif_data = NULL;
1472 
1474 }
1475 
1476 static int
1477 LogLuvVSetField(TIFF* tif, ttag_t tag, va_list ap)
1478 {
1479  LogLuvState* sp = DecoderState(tif);
1480  int bps, fmt;
1481 
1482  switch (tag) {
1483  case TIFFTAG_SGILOGDATAFMT:
1484  sp->user_datafmt = va_arg(ap, int);
1485  /*
1486  * Tweak the TIFF header so that the rest of libtiff knows what
1487  * size of data will be passed between app and library, and
1488  * assume that the app knows what it is doing and is not
1489  * confused by these header manipulations...
1490  */
1491  switch (sp->user_datafmt) {
1492  case SGILOGDATAFMT_FLOAT:
1493  bps = 32, fmt = SAMPLEFORMAT_IEEEFP;
1494  break;
1495  case SGILOGDATAFMT_16BIT:
1496  bps = 16, fmt = SAMPLEFORMAT_INT;
1497  break;
1498  case SGILOGDATAFMT_RAW:
1499  bps = 32, fmt = SAMPLEFORMAT_UINT;
1501  break;
1502  case SGILOGDATAFMT_8BIT:
1503  bps = 8, fmt = SAMPLEFORMAT_UINT;
1504  break;
1505  default:
1507  "Unknown data format %d for LogLuv compression",
1508  sp->user_datafmt);
1509  return (0);
1510  }
1513  /*
1514  * Must recalculate sizes should bits/sample change.
1515  */
1516  tif->tif_tilesize = isTiled(tif) ? TIFFTileSize(tif) : (tsize_t) -1;
1517  tif->tif_scanlinesize = TIFFScanlineSize(tif);
1518  return (1);
1519  case TIFFTAG_SGILOGENCODE:
1520  sp->encode_meth = va_arg(ap, int);
1521  if (sp->encode_meth != SGILOGENCODE_NODITHER &&
1522  sp->encode_meth != SGILOGENCODE_RANDITHER) {
1524  "Unknown encoding %d for LogLuv compression",
1525  sp->encode_meth);
1526  return (0);
1527  }
1528  return (1);
1529  default:
1530  return (*sp->vsetparent)(tif, tag, ap);
1531  }
1532 }
1533 
1534 static int
1535 LogLuvVGetField(TIFF* tif, ttag_t tag, va_list ap)
1536 {
1537  LogLuvState *sp = (LogLuvState *)tif->tif_data;
1538 
1539  switch (tag) {
1540  case TIFFTAG_SGILOGDATAFMT:
1541  *va_arg(ap, int*) = sp->user_datafmt;
1542  return (1);
1543  default:
1544  return (*sp->vgetparent)(tif, tag, ap);
1545  }
1546 }
1547 
1548 static const TIFFFieldInfo LogLuvFieldInfo[] = {
1550  TRUE, FALSE, "SGILogDataFmt"},
1552  TRUE, FALSE, "SGILogEncode"}
1553 };
1554 
1555 int
1556 TIFFInitSGILog(TIFF* tif, int scheme)
1557 {
1558  static const char module[] = "TIFFInitSGILog";
1559  LogLuvState* sp;
1560 
1561  assert(scheme == COMPRESSION_SGILOG24 || scheme == COMPRESSION_SGILOG);
1562 
1563  /*
1564  * Allocate state block so tag methods have storage to record values.
1565  */
1566  tif->tif_data = (tidata_t) _TIFFmalloc(sizeof (LogLuvState));
1567  if (tif->tif_data == NULL)
1568  goto bad;
1569  sp = (LogLuvState*) tif->tif_data;
1570  _TIFFmemset((tdata_t)sp, 0, sizeof (*sp));
1571  sp->user_datafmt = SGILOGDATAFMT_UNKNOWN;
1572  sp->encode_meth = (scheme == COMPRESSION_SGILOG24) ?
1574  sp->tfunc = _logLuvNop;
1575 
1576  /*
1577  * Install codec methods.
1578  * NB: tif_decoderow & tif_encoderow are filled
1579  * in at setup time.
1580  */
1581  tif->tif_setupdecode = LogLuvSetupDecode;
1582  tif->tif_decodestrip = LogLuvDecodeStrip;
1583  tif->tif_decodetile = LogLuvDecodeTile;
1584  tif->tif_setupencode = LogLuvSetupEncode;
1585  tif->tif_encodestrip = LogLuvEncodeStrip;
1586  tif->tif_encodetile = LogLuvEncodeTile;
1587  tif->tif_close = LogLuvClose;
1588  tif->tif_cleanup = LogLuvCleanup;
1589 
1590  /* override SetField so we can handle our private pseudo-tag */
1591  _TIFFMergeFieldInfo(tif, LogLuvFieldInfo,
1592  TIFFArrayCount(LogLuvFieldInfo));
1593  sp->vgetparent = tif->tif_tagmethods.vgetfield;
1594  tif->tif_tagmethods.vgetfield = LogLuvVGetField; /* hook for codec tags */
1595  sp->vsetparent = tif->tif_tagmethods.vsetfield;
1596  tif->tif_tagmethods.vsetfield = LogLuvVSetField; /* hook for codec tags */
1597 
1598  return (1);
1599 bad:
1600  TIFFErrorExt(tif->tif_clientdata, module,
1601  "%s: No space for LogLuv state block", tif->tif_name);
1602  return (0);
1603 }
1604 #endif /* LOGLUV_SUPPORT */
1605 
1606 /* vim: set ts=8 sts=8 sw=8 noet: */
int32 tsize_t
Definition: tiffio.h:66
uint16 tsample_t
Definition: tiffio.h:63
uint32 ttag_t
Definition: tiffio.h:61
TIFFCodeMethod tif_decoderow
Definition: tiffiop.h:146
TIFFTagMethods tif_tagmethods
Definition: tiffiop.h:183
void * tdata_t
Definition: tiffio.h:67
tsize_t TIFFTileRowSize(TIFF *tif)
Definition: tif_tile.c:174
uint32 td_imagewidth
Definition: tif_dir.h:41
for(n=1;n< outline->n_points;n++)
Definition: ftbbox.c:593
#define EncoderState(tif)
Definition: tif_luv.c:174
T sqrt(T a)
Definition: glsl_math.hpp:592
#define SGILOGDATAFMT_RAW
Definition: tiff.h:574
#define TIFFTAG_BITSPERSAMPLE
Definition: tiff.h:167
GLfloat GLfloat p
void XYZtoRGB24(float xyz[3], uint8 rgb[3])
Definition: tif_luv.c:714
uint16 td_bitspersample
Definition: tif_dir.h:44
#define NULL
Definition: ftobjs.h:61
TIFFCodeMethod tif_encodestrip
Definition: tiffiop.h:149
GLint GLint GLint GLint GLint GLint y
double LogL10toY(int p10)
Definition: tif_luv.c:732
short ncum
Definition: uvcode.h:8
sizeof(AF_ModuleRec)
float ustart
Definition: uvcode.h:7
#define PHOTOMETRIC_LOGL
Definition: tiff.h:210
TIFFCodeMethod tif_encoderow
Definition: tiffiop.h:147
#define COMPRESSION_SGILOG24
Definition: tiff.h:197
unsigned char uint8
Definition: tiff.h:67
#define TIFFTAG_SGILOGDATAFMT
Definition: tiff.h:571
tsize_t TIFFScanlineSize(TIFF *tif)
Definition: tif_strip.c:227
TIFFVoidMethod tif_close
Definition: tiffiop.h:152
#define PHOTOMETRIC_LOGLUV
Definition: tiff.h:211
thandle_t tif_clientdata
Definition: tiffiop.h:171
#define UV_NDIVS
Definition: uvcode.h:3
int uv_decode(double *up, double *vp, int c)
Definition: tif_luv.c:836
GLint GLint GLint GLint GLint x
#define UVSCALE
Definition: tiffio.h:477
struct logLuvState LogLuvState
Definition: tif_luv.c:158
typedef void(APIENTRY *GLDEBUGPROCARB)(GLenum source
char * tif_name
Definition: tiffiop.h:96
#define UV_NVS
Definition: uvcode.h:5
Definition: tiffiop.h:95
GLboolean GLboolean GLboolean b
#define SAMPLEFORMAT_INT
Definition: tiff.h:313
png_uint_32 i
Definition: png.h:2640
#define SGILOGDATAFMT_FLOAT
Definition: tiff.h:572
#define log2(x)
Definition: tif_luv.c:639
#define UV_SQSIZ
Definition: uvcode.h:2
tidata_t tif_rawcp
Definition: tiffiop.h:163
TIFFCodeMethod tif_decodestrip
Definition: tiffiop.h:148
#define V_NEU
Definition: tiffio.h:476
#define TIFFTAG_SAMPLESPERPIXEL
Definition: tiff.h:235
tsize_t tif_tilesize
Definition: tiffiop.h:137
#define PACK(s, b, f)
TIFFCodeMethod tif_encodetile
Definition: tiffiop.h:151
#define SAMPLEFORMAT_VOID
Definition: tiff.h:315
int LogL16fromY(double Y, int em)
Definition: tif_luv.c:665
uint32 LogLuv24fromXYZ(float XYZ[3], int em)
Definition: tif_luv.c:896
GLenum GLint GLuint mask
const GLdouble * v
GLdouble GLdouble GLdouble r
#define SAMPLEFORMAT_UINT
Definition: tiff.h:312
uint32 LogLuv32fromXYZ(float XYZ[3], int em)
Definition: tif_luv.c:1034
#define DecoderState(tif)
Definition: tif_luv.c:173
TIFFVSetMethod vsetfield
Definition: tiffio.h:330
#define SAMPLEFORMAT_IEEEFP
Definition: tiff.h:314
#define M_LN2
Definition: tif_luv.c:634
TIFFPostMethod tif_postdecode
Definition: tiffiop.h:178
#define TIFFTAG_SGILOGENCODE
Definition: tiff.h:576
GLdouble n
void _TIFFMergeFieldInfo(TIFF *tif, const TIFFFieldInfo info[], int n)
Definition: tif_dirinfo.c:570
uint32 td_rowsperstrip
Definition: tif_dir.h:52
const GLubyte * c
uint16 td_planarconfig
Definition: tif_dir.h:57
void TIFFErrorExt(thandle_t fd, const char *module, const char *fmt,...)
Definition: tif_error.c:63
tsize_t tif_rawdatasize
Definition: tiffiop.h:162
tsize_t tif_rawcc
Definition: tiffiop.h:164
#define FALSE
Definition: ftobjs.h:57
#define UV_VSTART
Definition: uvcode.h:4
TIFFCodeMethod tif_decodetile
Definition: tiffiop.h:150
#define COMPRESSION_SGILOG
Definition: tiff.h:196
#define SGILOGENCODE_NODITHER
Definition: tiff.h:577
TIFFVoidMethod tif_cleanup
Definition: tiffiop.h:154
#define TIFFArrayCount(a)
Definition: tiffiop.h:232
void _TIFFmemset(tdata_t p, int v, tsize_t c)
Definition: tif_acorn.c:479
#define SGILOGDATAFMT_16BIT
Definition: tiff.h:573
void _TIFFSetDefaultCompressionState(TIFF *tif)
Definition: tif_compress.c:127
void LogLuv24toXYZ(uint32 p, float XYZ[3])
Definition: tif_luv.c:868
#define isTiled(tif)
Definition: tiffiop.h:189
#define SGILOGDATAFMT_8BIT
Definition: tiff.h:575
T exp(T a)
Definition: glsl_math.hpp:460
#define itrunc(x, m)
Definition: tif_luv.c:642
void _TIFFNoPostDecode(TIFF *tif, tidata_t buf, tsize_t cc)
Definition: tif_read.c:613
unsigned long uint32
Definition: md5.h:41
uint16 td_samplesperpixel
Definition: tif_dir.h:51
tidataval_t * tidata_t
Definition: tiffiop.h:84
typedef int
Definition: png.h:978
unsigned char tidataval_t
Definition: tiffiop.h:83
short nus
Definition: uvcode.h:8
uint32 tif_row
Definition: tiffiop.h:126
short int16
Definition: tiff.h:69
#define SGILOGDATAFMT_UNKNOWN
Definition: tif_luv.c:176
#define SGILOGENCODE_RANDITHER
Definition: tiff.h:578
tsize_t TIFFTileSize(TIFF *tif)
Definition: tif_tile.c:241
TIFFDirectory tif_dir
Definition: tiffiop.h:122
#define U_NEU
Definition: tiffio.h:475
tsize_t tif_scanlinesize
Definition: tiffiop.h:159
int TIFFInitSGILog(TIFF *tif, int scheme)
Definition: tif_luv.c:1556
#define uv2ang(u, v)
Definition: tif_luv.c:754
GLdouble s
int TIFFSetField(TIFF *tif, ttag_t tag,...)
Definition: tif_dir.c:627
uint16 td_compression
Definition: tif_dir.h:46
GLboolean GLboolean g
void * _TIFFmalloc(tsize_t s)
Definition: tif_acorn.c:461
#define MINRUN
Definition: tif_luv.c:178
uint16 td_sampleformat
Definition: tif_dir.h:45
#define NANGLES
Definition: tif_luv.c:753
void LogLuv32toXYZ(uint32 p, float XYZ[3])
Definition: tif_luv.c:1009
void _TIFFfree(tdata_t p)
Definition: tif_acorn.c:467
#define FIELD_PSEUDO
Definition: tif_dir.h:151
double LogL16toY(int p16)
Definition: tif_luv.c:650
#define TIFFTAG_SAMPLEFORMAT
Definition: tiff.h:311
int(* TIFFVSetMethod)(TIFF *, ttag_t, va_list)
Definition: tiffio.h:325
TIFFVGetMethod vgetfield
Definition: tiffio.h:331
TIFFBoolMethod tif_setupencode
Definition: tiffiop.h:142
tidata_t tif_data
Definition: tiffiop.h:157
int uv_encode(double u, double v, int em)
Definition: tif_luv.c:814
#define TRUE
Definition: ftobjs.h:53
int TIFFFlushData1(TIFF *tif)
Definition: tif_write.c:696
#define PLANARCONFIG_CONTIG
Definition: tiff.h:243
uint16 td_photometric
Definition: tif_dir.h:47
int LogL10fromY(double Y, int em)
Definition: tif_luv.c:743
TIFFBoolMethod tif_setupdecode
Definition: tiffiop.h:140