2
* Copyright (c) 1997 Greg Ward Larson
3
* Copyright (c) 1997 Silicon Graphics, Inc.
5
* Permission to use, copy, modify, distribute, and sell this software and
6
* its documentation for any purpose is hereby granted without fee, provided
7
* that (i) the above copyright notices and this permission notice appear in
8
* all copies of the software and related documentation, and (ii) the names of
9
* Sam Leffler, Greg Larson and Silicon Graphics may not be used in any
10
* advertising or publicity relating to the software without the specific,
11
* prior written permission of Sam Leffler, Greg Larson and Silicon Graphics.
13
* THE SOFTWARE IS PROVIDED "AS-IS" AND WITHOUT WARRANTY OF ANY KIND,
14
* EXPRESS, IMPLIED OR OTHERWISE, INCLUDING WITHOUT LIMITATION, ANY
15
* WARRANTY OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE.
17
* IN NO EVENT SHALL SAM LEFFLER, GREG LARSON OR SILICON GRAPHICS BE LIABLE
18
* FOR ANY SPECIAL, INCIDENTAL, INDIRECT OR CONSEQUENTIAL DAMAGES OF ANY KIND,
19
* OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
20
* WHETHER OR NOT ADVISED OF THE POSSIBILITY OF DAMAGE, AND ON ANY THEORY OF
21
* LIABILITY, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
30
* LogLuv compression support for high dynamic range images.
32
* Contributed by Greg Larson.
34
* LogLuv image support uses the TIFF library to store 16 or 10-bit
35
* log luminance values with 8 bits each of u and v or a 14-bit index.
37
* The codec can take as input and produce as output 32-bit IEEE float values
38
* as well as 16-bit integer values. A 16-bit luminance is interpreted
39
* as a sign bit followed by a 15-bit integer that is converted
40
* to and from a linear magnitude using the transformation:
42
* L = 2^( (Le+.5)/256 - 64 ) # real from 15-bit
44
* Le = floor( 256*(log2(L) + 64) ) # 15-bit from real
46
* The actual conversion to world luminance units in candelas per sq. meter
47
* requires an additional multiplier, which is stored in the TIFFTAG_STONITS.
48
* This value is usually set such that a reasonable exposure comes from
49
* clamping decoded luminances above 1 to 1 in the displayed image.
51
* The 16-bit values for u and v may be converted to real values by dividing
52
* each by 32768. (This allows for negative values, which aren't useful as
53
* far as we know, but are left in case of future improvements in human
56
* Conversion from (u,v), which is actually the CIE (u',v') system for
57
* you color scientists, is accomplished by the following transformation:
59
* u = 4*x / (-2*x + 12*y + 3)
60
* v = 9*y / (-2*x + 12*y + 3)
62
* x = 9*u / (6*u - 16*v + 12)
63
* y = 4*v / (6*u - 16*v + 12)
65
* This process is greatly simplified by passing 32-bit IEEE floats
66
* for each of three CIE XYZ coordinates. The codec then takes care
67
* of conversion to and from LogLuv, though the application is still
68
* responsible for interpreting the TIFFTAG_STONITS calibration factor.
70
* By definition, a CIE XYZ vector of [1 1 1] corresponds to a neutral white
71
* point of (x,y)=(1/3,1/3). However, most color systems assume some other
72
* white point, such as D65, and an absolute color conversion to XYZ then
73
* to another color space with a different white point may introduce an
74
* unwanted color cast to the image. It is often desirable, therefore, to
75
* perform a white point conversion that maps the input white to [1 1 1]
76
* in XYZ, then record the original white point using the TIFFTAG_WHITEPOINT
77
* tag value. A decoder that demands absolute color calibration may use
78
* this white point tag to get back the original colors, but usually it
79
* will be ignored and the new white point will be used instead that
80
* matches the output color space.
82
* Pixel information is compressed into one of two basic encodings, depending
83
* on the setting of the compression tag, which is one of COMPRESSION_SGILOG
84
* or COMPRESSION_SGILOG24. For COMPRESSION_SGILOG, greyscale data is
90
* COMPRESSION_SGILOG color data is stored as:
93
* |-+---------------|--------+--------|
96
* For the 24-bit COMPRESSION_SGILOG24 color format, the data is stored as:
99
* |----------|--------------|
102
* There is no sign bit in the 24-bit case, and the (u,v) chromaticity is
103
* encoded as an index for optimal color resolution. The 10 log bits are
104
* defined by the following conversions:
106
* L = 2^((Le'+.5)/64 - 12) # real from 10-bit
108
* Le' = floor( 64*(log2(L) + 12) ) # 10-bit from real
110
* The 10 bits of the smaller format may be converted into the 15 bits of
111
* the larger format by multiplying by 4 and adding 13314. Obviously,
112
* a smaller range of magnitudes is covered (about 5 orders of magnitude
113
* instead of 38), and the lack of a sign bit means that negative luminances
114
* are not allowed. (Well, they aren't allowed in the real world, either,
115
* but they are useful for certain types of image processing.)
117
* The desired user format is controlled by the setting the internal
118
* pseudo tag TIFFTAG_SGILOGDATAFMT to one of:
119
* SGILOGDATAFMT_FLOAT = IEEE 32-bit float XYZ values
120
* SGILOGDATAFMT_16BIT = 16-bit integer encodings of logL, u and v
121
* Raw data i/o is also possible using:
122
* SGILOGDATAFMT_RAW = 32-bit unsigned integer with encoded pixel
123
* In addition, the following decoding is provided for ease of display:
124
* SGILOGDATAFMT_8BIT = 8-bit default RGB gamma-corrected values
126
* For grayscale images, we provide the following data formats:
127
* SGILOGDATAFMT_FLOAT = IEEE 32-bit float Y values
128
* SGILOGDATAFMT_16BIT = 16-bit integer w/ encoded luminance
129
* SGILOGDATAFMT_8BIT = 8-bit gray monitor values
131
* Note that the COMPRESSION_SGILOG applies a simple run-length encoding
132
* scheme by separating the logL, u and v bytes for each row and applying
133
* a PackBits type of compression. Since the 24-bit encoding is not
134
* adaptive, the 32-bit color format takes less space in many cases.
136
* Further control is provided over the conversion from higher-resolution
137
* formats to final encoded values through the pseudo tag
138
* TIFFTAG_SGILOGENCODE:
139
* SGILOGENCODE_NODITHER = do not dither encoded values
140
* SGILOGENCODE_RANDITHER = apply random dithering during encoding
142
* The default value of this tag is SGILOGENCODE_NODITHER for
143
* COMPRESSION_SGILOG to maximize run-length encoding and
144
* SGILOGENCODE_RANDITHER for COMPRESSION_SGILOG24 to turn
145
* quantization errors into noise.
154
* State block for each open TIFF
155
* file using LogLuv compression/decompression.
157
typedef struct logLuvState LogLuvState;
160
int user_datafmt; /* user data format */
161
int encode_meth; /* encoding method */
162
int pixel_size; /* bytes per pixel */
164
tidata_t* tbuf; /* translation buffer */
165
int tbuflen; /* buffer length */
166
void (*tfunc)(LogLuvState*, tidata_t, int);
168
TIFFVSetMethod vgetparent; /* super-class method */
169
TIFFVSetMethod vsetparent; /* super-class method */
172
#define DecoderState(tif) ((LogLuvState*) (tif)->tif_data)
173
#define EncoderState(tif) ((LogLuvState*) (tif)->tif_data)
175
#define N(a) (sizeof(a)/sizeof(a[0]))
176
#define SGILOGDATAFMT_UNKNOWN -1
178
#define MINRUN 4 /* minimum run length */
181
* Decode a string of 16-bit gray pixels.
184
LogL16Decode(TIFF* tif, tidata_t op, tsize_t occ, tsample_t s)
186
LogLuvState* sp = DecoderState(tif);
187
int shft, i, npixels;
196
npixels = occ / sp->pixel_size;
198
if (sp->user_datafmt == SGILOGDATAFMT_16BIT)
201
assert(sp->tbuflen >= npixels);
202
tp = (int16*) sp->tbuf;
204
_TIFFmemset((tdata_t) tp, 0, npixels*sizeof (tp[0]));
206
bp = (u_char*) tif->tif_rawcp;
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);
215
while (rc-- && i < npixels)
217
} else { /* non-run */
218
rc = *bp++; /* nul is noop */
219
while (--cc && rc-- && i < npixels)
220
tp[i++] |= (int16)*bp++ << shft;
223
TIFFError(tif->tif_name,
224
"LogL16Decode: Not enough data at row %d (short %d pixels)",
225
tif->tif_row, npixels - i);
226
tif->tif_rawcp = (tidata_t) bp;
231
(*sp->tfunc)(sp, op, npixels);
232
tif->tif_rawcp = (tidata_t) bp;
238
* Decode a string of 24-bit pixels.
241
LogLuvDecode24(TIFF* tif, tidata_t op, tsize_t occ, tsample_t s)
243
LogLuvState* sp = DecoderState(tif);
251
npixels = occ / sp->pixel_size;
253
if (sp->user_datafmt == SGILOGDATAFMT_RAW)
256
assert(sp->tbuflen >= npixels);
257
tp = (uint32 *) sp->tbuf;
259
/* copy to array of uint32 */
260
bp = (u_char*) tif->tif_rawcp;
262
for (i = 0; i < npixels && cc > 0; i++) {
263
tp[i] = bp[0] << 16 | bp[1] << 8 | bp[2];
267
tif->tif_rawcp = (tidata_t) bp;
270
TIFFError(tif->tif_name,
271
"LogLuvDecode24: Not enough data at row %d (short %d pixels)",
272
tif->tif_row, npixels - i);
275
(*sp->tfunc)(sp, op, npixels);
280
* Decode a string of 32-bit pixels.
283
LogLuvDecode32(TIFF* tif, tidata_t op, tsize_t occ, tsample_t s)
286
int shft, i, npixels;
293
sp = DecoderState(tif);
296
npixels = occ / sp->pixel_size;
298
if (sp->user_datafmt == SGILOGDATAFMT_RAW)
301
assert(sp->tbuflen >= npixels);
302
tp = (uint32*) sp->tbuf;
304
_TIFFmemset((tdata_t) tp, 0, npixels*sizeof (tp[0]));
306
bp = (u_char*) tif->tif_rawcp;
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;
315
while (rc-- && i < npixels)
317
} else { /* non-run */
318
rc = *bp++; /* nul is noop */
319
while (--cc && rc-- && i < npixels)
320
tp[i++] |= (uint32)*bp++ << shft;
323
TIFFError(tif->tif_name,
324
"LogLuvDecode32: Not enough data at row %d (short %d pixels)",
325
tif->tif_row, npixels - i);
326
tif->tif_rawcp = (tidata_t) bp;
331
(*sp->tfunc)(sp, op, npixels);
332
tif->tif_rawcp = (tidata_t) bp;
338
* Decode a strip of pixels. We break it into rows to
339
* maintain synchrony with the encode algorithm, which
343
LogLuvDecodeStrip(TIFF* tif, tidata_t bp, tsize_t cc, tsample_t s)
345
tsize_t rowlen = TIFFScanlineSize(tif);
347
assert(cc%rowlen == 0);
348
while (cc && (*tif->tif_decoderow)(tif, bp, rowlen, s))
349
bp += rowlen, cc -= rowlen;
354
* Decode a tile of pixels. We break it into rows to
355
* maintain synchrony with the encode algorithm, which
359
LogLuvDecodeTile(TIFF* tif, tidata_t bp, tsize_t cc, tsample_t s)
361
tsize_t rowlen = TIFFTileRowSize(tif);
363
assert(cc%rowlen == 0);
364
while (cc && (*tif->tif_decoderow)(tif, bp, rowlen, s))
365
bp += rowlen, cc -= rowlen;
370
* Encode a row of 16-bit pixels.
373
LogL16Encode(TIFF* tif, tidata_t bp, tsize_t cc, tsample_t s)
375
LogLuvState* sp = EncoderState(tif);
376
int shft, i, j, npixels;
380
int occ, rc=0, mask, beg;
384
npixels = cc / sp->pixel_size;
386
if (sp->user_datafmt == SGILOGDATAFMT_16BIT)
389
tp = (int16*) sp->tbuf;
390
assert(sp->tbuflen >= npixels);
391
(*sp->tfunc)(sp, bp, npixels);
393
/* compress each byte string */
395
occ = tif->tif_rawdatasize - tif->tif_rawcc;
396
for (shft = 2*8; (shft -= 8) >= 0; )
397
for (i = 0; i < npixels; i += rc) {
400
tif->tif_rawcc = tif->tif_rawdatasize - occ;
401
if (!TIFFFlushData1(tif))
404
occ = tif->tif_rawdatasize - tif->tif_rawcc;
406
mask = 0xff << shft; /* find next run */
407
for (beg = i; beg < npixels; beg += rc) {
408
b = (int16) (tp[beg] & mask);
410
while (rc < 127+2 && beg+rc < npixels &&
411
(tp[beg+rc] & mask) == b)
414
break; /* long enough */
416
if (beg-i > 1 && beg-i < MINRUN) {
417
b = (int16) (tp[i] & mask);/*check short run */
419
while ((tp[j++] & mask) == b)
421
*op++ = (tidataval_t)(128-2+j-i);
422
*op++ = (tidataval_t) (b >> shft);
428
while (i < beg) { /* write out non-run */
429
if ((j = beg-i) > 127) j = 127;
432
tif->tif_rawcc = tif->tif_rawdatasize - occ;
433
if (!TIFFFlushData1(tif))
436
occ = tif->tif_rawdatasize - tif->tif_rawcc;
438
*op++ = (tidataval_t) j; occ--;
440
*op++ = (tidataval_t) (tp[i++] >> shft & 0xff);
444
if (rc >= MINRUN) { /* write out run */
445
*op++ = (tidataval_t) (128-2+rc);
446
*op++ = (tidataval_t) (tp[beg] >> shft & 0xff);
452
tif->tif_rawcc = tif->tif_rawdatasize - occ;
458
* Encode a row of 24-bit pixels.
461
LogLuvEncode24(TIFF* tif, tidata_t bp, tsize_t cc, tsample_t s)
463
LogLuvState* sp = EncoderState(tif);
470
npixels = cc / sp->pixel_size;
472
if (sp->user_datafmt == SGILOGDATAFMT_RAW)
475
tp = (uint32*) sp->tbuf;
476
assert(sp->tbuflen >= npixels);
477
(*sp->tfunc)(sp, bp, npixels);
479
/* write out encoded pixels */
481
occ = tif->tif_rawdatasize - tif->tif_rawcc;
482
for (i = npixels; i--; ) {
485
tif->tif_rawcc = tif->tif_rawdatasize - occ;
486
if (!TIFFFlushData1(tif))
489
occ = tif->tif_rawdatasize - tif->tif_rawcc;
491
*op++ = (tidataval_t)(*tp >> 16);
492
*op++ = (tidataval_t)(*tp >> 8 & 0xff);
493
*op++ = (tidataval_t)(*tp++ & 0xff);
497
tif->tif_rawcc = tif->tif_rawdatasize - occ;
503
* Encode a row of 32-bit pixels.
506
LogLuvEncode32(TIFF* tif, tidata_t bp, tsize_t cc, tsample_t s)
508
LogLuvState* sp = EncoderState(tif);
509
int shft, i, j, npixels;
513
int occ, rc=0, mask, beg;
518
npixels = cc / sp->pixel_size;
520
if (sp->user_datafmt == SGILOGDATAFMT_RAW)
523
tp = (uint32*) sp->tbuf;
524
assert(sp->tbuflen >= npixels);
525
(*sp->tfunc)(sp, bp, npixels);
527
/* compress each byte string */
529
occ = tif->tif_rawdatasize - tif->tif_rawcc;
530
for (shft = 4*8; (shft -= 8) >= 0; )
531
for (i = 0; i < npixels; i += rc) {
534
tif->tif_rawcc = tif->tif_rawdatasize - occ;
535
if (!TIFFFlushData1(tif))
538
occ = tif->tif_rawdatasize - tif->tif_rawcc;
540
mask = 0xff << shft; /* find next run */
541
for (beg = i; beg < npixels; beg += rc) {
544
while (rc < 127+2 && beg+rc < npixels &&
545
(tp[beg+rc] & mask) == b)
548
break; /* long enough */
550
if (beg-i > 1 && beg-i < MINRUN) {
551
b = tp[i] & mask; /* check short run */
553
while ((tp[j++] & mask) == b)
555
*op++ = (tidataval_t)(128-2+j-i);
556
*op++ = (tidataval_t)(b >> shft);
562
while (i < beg) { /* write out non-run */
563
if ((j = beg-i) > 127) j = 127;
566
tif->tif_rawcc = tif->tif_rawdatasize - occ;
567
if (!TIFFFlushData1(tif))
570
occ = tif->tif_rawdatasize - tif->tif_rawcc;
572
*op++ = (tidataval_t) j; occ--;
574
*op++ = (tidataval_t)(tp[i++] >> shft & 0xff);
578
if (rc >= MINRUN) { /* write out run */
579
*op++ = (tidataval_t) (128-2+rc);
580
*op++ = (tidataval_t)(tp[beg] >> shft & 0xff);
586
tif->tif_rawcc = tif->tif_rawdatasize - occ;
592
* Encode a strip of pixels. We break it into rows to
593
* avoid encoding runs across row boundaries.
596
LogLuvEncodeStrip(TIFF* tif, tidata_t bp, tsize_t cc, tsample_t s)
598
tsize_t rowlen = TIFFScanlineSize(tif);
600
assert(cc%rowlen == 0);
601
while (cc && (*tif->tif_encoderow)(tif, bp, rowlen, s) == 0)
602
bp += rowlen, cc -= rowlen;
607
* Encode a tile of pixels. We break it into rows to
608
* avoid encoding runs across row boundaries.
611
LogLuvEncodeTile(TIFF* tif, tidata_t bp, tsize_t cc, tsample_t s)
613
tsize_t rowlen = TIFFTileRowSize(tif);
615
assert(cc%rowlen == 0);
616
while (cc && (*tif->tif_encoderow)(tif, bp, rowlen, s) == 0)
617
bp += rowlen, cc -= rowlen;
622
* Encode/Decode functions for converting to and from user formats.
628
#define U_NEU 0.210526316
629
#define V_NEU 0.473684211
634
#define M_LN2 0.69314718055994530942
637
#define M_PI 3.14159265358979323846
639
#define log2(x) ((1./M_LN2)*log(x))
640
#define exp2(x) exp(M_LN2*(x))
642
#define itrunc(x,m) ((m)==SGILOGENCODE_NODITHER ? \
644
(int)((x) + rand()*(1./RAND_MAX) - .5))
650
LogL16toY(int p16) /* compute luminance from 16-bit LogL */
652
int Le = p16 & 0x7fff;
657
Y = exp(M_LN2/256.*(Le+.5) - M_LN2*64.);
658
return (!(p16 & 0x8000) ? Y : -Y);
665
LogL16fromY(double Y, int em) /* get 16-bit LogL from Y */
667
if (Y >= 1.8371976e19)
669
if (Y <= -1.8371976e19)
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));
679
L16toY(LogLuvState* sp, tidata_t op, int n)
681
int16* l16 = (int16*) sp->tbuf;
682
float* yp = (float*) op;
685
*yp++ = (float)LogL16toY(*l16++);
689
L16toGry(LogLuvState* sp, tidata_t op, int n)
691
int16* l16 = (int16*) sp->tbuf;
692
uint8* gp = (uint8*) op;
695
double Y = LogL16toY(*l16++);
696
*gp++ = (uint8) ((Y <= 0.) ? 0 : (Y >= 1.) ? 255 : (int)(256.*sqrt(Y)));
701
L16fromY(LogLuvState* sp, tidata_t op, int n)
703
int16* l16 = (int16*) sp->tbuf;
704
float* yp = (float*) op;
707
*l16++ = (int16) (LogL16fromY(*yp++, sp->encode_meth));
714
XYZtoRGB24(float xyz[3], uint8 rgb[3])
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)));
732
LogL10toY(int p10) /* compute luminance from 10-bit LogL */
736
return (exp(M_LN2/64.*(p10+.5) - M_LN2*12.));
743
LogL10fromY(double Y, int em) /* get 10-bit LogL from Y */
747
else if (Y <= .00024283)
750
return itrunc(64.*(log2(Y) + 12.), em);
754
#define uv2ang(u, v) ( (NANGLES*.499999999/M_PI) \
755
* atan2((v)-V_NEU,(u)-U_NEU) + .5*NANGLES )
758
oog_encode(double u, double v) /* encode out-of-gamut chroma */
760
static int oog_table[NANGLES];
761
static int initialized = 0;
764
if (!initialized) { /* set up perimeter table */
765
double eps[NANGLES], ua, va, ang, epsa;
767
for (i = NANGLES; i--; )
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)
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);
778
epsa = fabs(ang - (i+.5));
780
oog_table[i] = uv_row[vi].ncum + ui;
785
for (i = NANGLES; i--; ) /* fill any holes */
788
for (i1 = 1; i1 < NANGLES/2; i1++)
789
if (eps[(i+i1)%NANGLES] < 1.5)
791
for (i2 = 1; i2 < NANGLES/2; i2++)
792
if (eps[(i+NANGLES-i2)%NANGLES] < 1.5)
796
oog_table[(i+i1)%NANGLES];
799
oog_table[(i+NANGLES-i2)%NANGLES];
803
i = (int) uv2ang(u, v); /* look up hue angle */
804
return (oog_table[i]);
814
uv_encode(double u, double v, int em) /* encode (u',v') coordinates */
819
return oog_encode(u, v);
820
vi = itrunc((v - UV_VSTART)*(1./UV_SQSIZ), em);
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);
829
return (uv_row[vi].ncum + ui);
836
uv_decode(double *up, double *vp, int c) /* decode (u',v') index */
841
if (c < 0 || c >= UV_NDIVS)
843
lower = 0; /* binary search */
845
while (upper - lower > 1) {
846
vi = (lower + upper) >> 1;
847
ui = c - uv_row[vi].ncum;
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;
868
LogLuv24toXYZ(uint32 p, float XYZ[3])
871
double L, u, v, s, x, y;
872
/* decode luminance */
873
L = LogL10toY(p>>14 & 0x3ff);
875
XYZ[0] = XYZ[1] = XYZ[2] = 0.;
880
if (uv_decode(&u, &v, Ce) < 0) {
881
u = U_NEU; v = V_NEU;
883
s = 1./(6.*u - 16.*v + 12.);
887
XYZ[0] = (float)(x/y * L);
889
XYZ[2] = (float)((1.-x-y)/y * L);
896
LogLuv24fromXYZ(float XYZ[3], int em)
900
/* encode luminance */
901
Le = LogL10fromY(XYZ[1], em);
903
s = XYZ[0] + 15.*XYZ[1] + 3.*XYZ[2];
904
if (!Le || s <= 0.) {
911
Ce = uv_encode(u, v, em);
912
if (Ce < 0) /* never happens */
913
Ce = uv_encode(U_NEU, V_NEU, SGILOGENCODE_NODITHER);
914
/* combine encodings */
915
return (Le << 14 | Ce);
919
Luv24toXYZ(LogLuvState* sp, tidata_t op, int n)
921
uint32* luv = (uint32*) sp->tbuf;
922
float* xyz = (float*) op;
925
LogLuv24toXYZ(*luv, xyz);
932
Luv24toLuv48(LogLuvState* sp, tidata_t op, int n)
934
uint32* luv = (uint32*) sp->tbuf;
935
int16* luv3 = (int16*) op;
940
*luv3++ = (int16)((*luv >> 12 & 0xffd) + 13314);
941
if (uv_decode(&u, &v, *luv&0x3fff) < 0) {
945
*luv3++ = (int16)(u * (1L<<15));
946
*luv3++ = (int16)(v * (1L<<15));
952
Luv24toRGB(LogLuvState* sp, tidata_t op, int n)
954
uint32* luv = (uint32*) sp->tbuf;
955
uint8* rgb = (uint8*) op;
960
LogLuv24toXYZ(*luv++, xyz);
961
XYZtoRGB24(xyz, rgb);
967
Luv24fromXYZ(LogLuvState* sp, tidata_t op, int n)
969
uint32* luv = (uint32*) sp->tbuf;
970
float* xyz = (float*) op;
973
*luv++ = LogLuv24fromXYZ(xyz, sp->encode_meth);
979
Luv24fromLuv48(LogLuvState* sp, tidata_t op, int n)
981
uint32* luv = (uint32*) sp->tbuf;
982
int16* luv3 = (int16*) op;
989
else if (luv3[0] >= (1<<12)+3314)
991
else if (sp->encode_meth == SGILOGENCODE_NODITHER)
992
Le = (luv3[0]-3314) >> 2;
994
Le = itrunc(.25*(luv3[0]-3314.), sp->encode_meth);
996
Ce = uv_encode((luv3[1]+.5)/(1<<15), (luv3[2]+.5)/(1<<15),
998
if (Ce < 0) /* never happens */
999
Ce = uv_encode(U_NEU, V_NEU, SGILOGENCODE_NODITHER);
1000
*luv++ = (uint32)Le << 14 | Ce;
1009
LogLuv32toXYZ(uint32 p, float XYZ[3])
1011
double L, u, v, s, x, y;
1012
/* decode luminance */
1013
L = LogL16toY((int)p >> 16);
1015
XYZ[0] = XYZ[1] = XYZ[2] = 0.;
1019
u = 1./UVSCALE * ((p>>8 & 0xff) + .5);
1020
v = 1./UVSCALE * ((p & 0xff) + .5);
1021
s = 1./(6.*u - 16.*v + 12.);
1024
/* convert to XYZ */
1025
XYZ[0] = (float)(x/y * L);
1027
XYZ[2] = (float)((1.-x-y)/y * L);
1034
LogLuv32fromXYZ(float XYZ[3], int em)
1036
unsigned int Le, ue, ve;
1038
/* encode luminance */
1039
Le = (unsigned int)LogL16fromY(XYZ[1], em);
1041
s = XYZ[0] + 15.*XYZ[1] + 3.*XYZ[2];
1042
if (!Le || s <= 0.) {
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);
1060
Luv32toXYZ(LogLuvState* sp, tidata_t op, int n)
1062
uint32* luv = (uint32*) sp->tbuf;
1063
float* xyz = (float*) op;
1066
LogLuv32toXYZ(*luv++, xyz);
1072
Luv32toLuv48(LogLuvState* sp, tidata_t op, int n)
1074
uint32* luv = (uint32*) sp->tbuf;
1075
int16* luv3 = (int16*) op;
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));
1090
Luv32toRGB(LogLuvState* sp, tidata_t op, int n)
1092
uint32* luv = (uint32*) sp->tbuf;
1093
uint8* rgb = (uint8*) op;
1098
LogLuv32toXYZ(*luv++, xyz);
1099
XYZtoRGB24(xyz, rgb);
1105
Luv32fromXYZ(LogLuvState* sp, tidata_t op, int n)
1107
uint32* luv = (uint32*) sp->tbuf;
1108
float* xyz = (float*) op;
1111
*luv++ = LogLuv32fromXYZ(xyz, sp->encode_meth);
1117
Luv32fromLuv48(LogLuvState* sp, tidata_t op, int n)
1119
uint32* luv = (uint32*) sp->tbuf;
1120
int16* luv3 = (int16*) op;
1122
if (sp->encode_meth == SGILOGENCODE_NODITHER) {
1124
*luv++ = (uint32)luv3[0] << 16 |
1125
(luv3[1]*(uint32)(UVSCALE+.5) >> 7 & 0xff00) |
1126
(luv3[2]*(uint32)(UVSCALE+.5) >> 15 & 0xff);
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);
1140
_logLuvNop(LogLuvState* sp, tidata_t op, int n)
1142
(void) sp; (void) op; (void) n;
1146
LogL16GuessDataFmt(TIFFDirectory *td)
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);
1161
return (SGILOGDATAFMT_UNKNOWN);
1165
multiply(size_t m1, size_t m2)
1167
uint32 bytes = m1 * m2;
1169
if (m1 && bytes / m1 != m2)
1176
LogL16InitState(TIFF* tif)
1178
TIFFDirectory *td = &tif->tif_dir;
1179
LogLuvState* sp = DecoderState(tif);
1180
static const char module[] = "LogL16InitState";
1183
assert(td->td_photometric == PHOTOMETRIC_LOGL);
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);
1192
case SGILOGDATAFMT_16BIT:
1193
sp->pixel_size = sizeof (int16);
1195
case SGILOGDATAFMT_8BIT:
1196
sp->pixel_size = sizeof (uint8);
1199
TIFFError(tif->tif_name,
1200
"No support for converting user data format to LogL");
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
TIFFError(module, "%s: No space for SGILog translation buffer",
1214
LogLuvGuessDataFmt(TIFFDirectory *td)
1219
* If the user didn't tell us their datafmt,
1220
* take our best guess from the bitspersample.
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;
1227
case PACK(32, SAMPLEFORMAT_VOID):
1228
case PACK(32, SAMPLEFORMAT_UINT):
1229
case PACK(32, SAMPLEFORMAT_INT):
1230
guess = SGILOGDATAFMT_RAW;
1232
case PACK(16, SAMPLEFORMAT_VOID):
1233
case PACK(16, SAMPLEFORMAT_INT):
1234
case PACK(16, SAMPLEFORMAT_UINT):
1235
guess = SGILOGDATAFMT_16BIT;
1237
case PACK( 8, SAMPLEFORMAT_VOID):
1238
case PACK( 8, SAMPLEFORMAT_UINT):
1239
guess = SGILOGDATAFMT_8BIT;
1242
guess = SGILOGDATAFMT_UNKNOWN;
1247
* Double-check samples per pixel.
1249
switch (td->td_samplesperpixel) {
1251
if (guess != SGILOGDATAFMT_RAW)
1252
guess = SGILOGDATAFMT_UNKNOWN;
1255
if (guess == SGILOGDATAFMT_RAW)
1256
guess = SGILOGDATAFMT_UNKNOWN;
1259
guess = SGILOGDATAFMT_UNKNOWN;
1266
LogLuvInitState(TIFF* tif)
1268
TIFFDirectory* td = &tif->tif_dir;
1269
LogLuvState* sp = DecoderState(tif);
1270
static const char module[] = "LogLuvInitState";
1273
assert(td->td_photometric == PHOTOMETRIC_LOGLUV);
1275
/* for some reason, we can't do this in TIFFInitLogLuv */
1276
if (td->td_planarconfig != PLANARCONFIG_CONTIG) {
1278
"SGILog compression cannot handle non-contiguous data");
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);
1287
case SGILOGDATAFMT_16BIT:
1288
sp->pixel_size = 3*sizeof (int16);
1290
case SGILOGDATAFMT_RAW:
1291
sp->pixel_size = sizeof (uint32);
1293
case SGILOGDATAFMT_8BIT:
1294
sp->pixel_size = 3*sizeof (uint8);
1297
TIFFError(tif->tif_name,
1298
"No support for converting user data format to LogLuv");
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
TIFFError(module, "%s: No space for SGILog translation buffer",
1312
LogLuvSetupDecode(TIFF* tif)
1314
LogLuvState* sp = DecoderState(tif);
1315
TIFFDirectory* td = &tif->tif_dir;
1317
tif->tif_postdecode = _TIFFNoPostDecode;
1318
switch (td->td_photometric) {
1319
case PHOTOMETRIC_LOGLUV:
1320
if (!LogLuvInitState(tif))
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;
1328
case SGILOGDATAFMT_16BIT:
1329
sp->tfunc = Luv24toLuv48;
1331
case SGILOGDATAFMT_8BIT:
1332
sp->tfunc = Luv24toRGB;
1336
tif->tif_decoderow = LogLuvDecode32;
1337
switch (sp->user_datafmt) {
1338
case SGILOGDATAFMT_FLOAT:
1339
sp->tfunc = Luv32toXYZ;
1341
case SGILOGDATAFMT_16BIT:
1342
sp->tfunc = Luv32toLuv48;
1344
case SGILOGDATAFMT_8BIT:
1345
sp->tfunc = Luv32toRGB;
1350
case PHOTOMETRIC_LOGL:
1351
if (!LogL16InitState(tif))
1353
tif->tif_decoderow = LogL16Decode;
1354
switch (sp->user_datafmt) {
1355
case SGILOGDATAFMT_FLOAT:
1358
case SGILOGDATAFMT_8BIT:
1359
sp->tfunc = L16toGry;
1364
TIFFError(tif->tif_name,
1365
"Inappropriate photometric interpretation %d for SGILog compression; %s",
1366
td->td_photometric, "must be either LogLUV or LogL");
1373
LogLuvSetupEncode(TIFF* tif)
1375
LogLuvState* sp = EncoderState(tif);
1376
TIFFDirectory* td = &tif->tif_dir;
1378
switch (td->td_photometric) {
1379
case PHOTOMETRIC_LOGLUV:
1380
if (!LogLuvInitState(tif))
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;
1388
case SGILOGDATAFMT_16BIT:
1389
sp->tfunc = Luv24fromLuv48;
1391
case SGILOGDATAFMT_RAW:
1397
tif->tif_encoderow = LogLuvEncode32;
1398
switch (sp->user_datafmt) {
1399
case SGILOGDATAFMT_FLOAT:
1400
sp->tfunc = Luv32fromXYZ;
1402
case SGILOGDATAFMT_16BIT:
1403
sp->tfunc = Luv32fromLuv48;
1405
case SGILOGDATAFMT_RAW:
1412
case PHOTOMETRIC_LOGL:
1413
if (!LogL16InitState(tif))
1415
tif->tif_encoderow = LogL16Encode;
1416
switch (sp->user_datafmt) {
1417
case SGILOGDATAFMT_FLOAT:
1418
sp->tfunc = L16fromY;
1420
case SGILOGDATAFMT_16BIT:
1427
TIFFError(tif->tif_name,
1428
"Inappropriate photometric interpretation %d for SGILog compression; %s",
1429
td->td_photometric, "must be either LogLUV or LogL");
1434
TIFFError(tif->tif_name,
1435
"SGILog compression supported only for %s, or raw data",
1436
td->td_photometric == PHOTOMETRIC_LOGL ? "Y, L" : "XYZ, Luv");
1441
LogLuvClose(TIFF* tif)
1443
TIFFDirectory *td = &tif->tif_dir;
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.
1452
td->td_samplesperpixel =
1453
(td->td_photometric == PHOTOMETRIC_LOGL) ? 1 : 3;
1454
td->td_bitspersample = 16;
1455
td->td_sampleformat = SAMPLEFORMAT_INT;
1459
LogLuvCleanup(TIFF* tif)
1461
LogLuvState* sp = (LogLuvState *)tif->tif_data;
1465
_TIFFfree(sp->tbuf);
1467
tif->tif_data = NULL;
1472
LogLuvVSetField(TIFF* tif, ttag_t tag, va_list ap)
1474
LogLuvState* sp = DecoderState(tif);
1478
case TIFFTAG_SGILOGDATAFMT:
1479
sp->user_datafmt = va_arg(ap, int);
1481
* Tweak the TIFF header so that the rest of libtiff knows what
1482
* size of data will be passed between app and library, and
1483
* assume that the app knows what it is doing and is not
1484
* confused by these header manipulations...
1486
switch (sp->user_datafmt) {
1487
case SGILOGDATAFMT_FLOAT:
1488
bps = 32, fmt = SAMPLEFORMAT_IEEEFP;
1490
case SGILOGDATAFMT_16BIT:
1491
bps = 16, fmt = SAMPLEFORMAT_INT;
1493
case SGILOGDATAFMT_RAW:
1494
bps = 32, fmt = SAMPLEFORMAT_UINT;
1495
TIFFSetField(tif, TIFFTAG_SAMPLESPERPIXEL, 1);
1497
case SGILOGDATAFMT_8BIT:
1498
bps = 8, fmt = SAMPLEFORMAT_UINT;
1501
TIFFError(tif->tif_name,
1502
"Unknown data format %d for LogLuv compression",
1506
TIFFSetField(tif, TIFFTAG_BITSPERSAMPLE, bps);
1507
TIFFSetField(tif, TIFFTAG_SAMPLEFORMAT, fmt);
1509
* Must recalculate sizes should bits/sample change.
1511
tif->tif_tilesize = TIFFTileSize(tif);
1512
tif->tif_scanlinesize = TIFFScanlineSize(tif);
1514
case TIFFTAG_SGILOGENCODE:
1515
sp->encode_meth = va_arg(ap, int);
1516
if (sp->encode_meth != SGILOGENCODE_NODITHER &&
1517
sp->encode_meth != SGILOGENCODE_RANDITHER) {
1518
TIFFError(tif->tif_name,
1519
"Unknown encoding %d for LogLuv compression",
1525
return (*sp->vsetparent)(tif, tag, ap);
1530
LogLuvVGetField(TIFF* tif, ttag_t tag, va_list ap)
1532
LogLuvState *sp = (LogLuvState *)tif->tif_data;
1535
case TIFFTAG_SGILOGDATAFMT:
1536
*va_arg(ap, int*) = sp->user_datafmt;
1539
return (*sp->vgetparent)(tif, tag, ap);
1543
static const TIFFFieldInfo LogLuvFieldInfo[] = {
1544
{ TIFFTAG_SGILOGDATAFMT, 0, 0, TIFF_SHORT, FIELD_PSEUDO,
1545
TRUE, FALSE, "SGILogDataFmt"},
1546
{ TIFFTAG_SGILOGENCODE, 0, 0, TIFF_SHORT, FIELD_PSEUDO,
1547
TRUE, FALSE, "SGILogEncode"}
1551
TIFFInitSGILog(TIFF* tif, int scheme)
1553
static const char module[] = "TIFFInitSGILog";
1556
assert(scheme == COMPRESSION_SGILOG24 || scheme == COMPRESSION_SGILOG);
1559
* Allocate state block so tag methods have storage to record values.
1561
tif->tif_data = (tidata_t) _TIFFmalloc(sizeof (LogLuvState));
1562
if (tif->tif_data == NULL)
1564
sp = (LogLuvState*) tif->tif_data;
1565
_TIFFmemset((tdata_t)sp, 0, sizeof (*sp));
1566
sp->user_datafmt = SGILOGDATAFMT_UNKNOWN;
1567
sp->encode_meth = (scheme == COMPRESSION_SGILOG24) ?
1568
SGILOGENCODE_RANDITHER : SGILOGENCODE_NODITHER;
1569
sp->tfunc = _logLuvNop;
1572
* Install codec methods.
1573
* NB: tif_decoderow & tif_encoderow are filled
1576
tif->tif_setupdecode = LogLuvSetupDecode;
1577
tif->tif_decodestrip = LogLuvDecodeStrip;
1578
tif->tif_decodetile = LogLuvDecodeTile;
1579
tif->tif_setupencode = LogLuvSetupEncode;
1580
tif->tif_encodestrip = LogLuvEncodeStrip;
1581
tif->tif_encodetile = LogLuvEncodeTile;
1582
tif->tif_close = LogLuvClose;
1583
tif->tif_cleanup = LogLuvCleanup;
1585
/* override SetField so we can handle our private pseudo-tag */
1586
_TIFFMergeFieldInfo(tif, LogLuvFieldInfo, N(LogLuvFieldInfo));
1587
sp->vgetparent = tif->tif_tagmethods.vgetfield;
1588
tif->tif_tagmethods.vgetfield = LogLuvVGetField; /* hook for codec tags */
1589
sp->vsetparent = tif->tif_tagmethods.vsetfield;
1590
tif->tif_tagmethods.vsetfield = LogLuvVSetField; /* hook for codec tags */
1594
TIFFError(module, "%s: No space for LogLuv state block", tif->tif_name);
1597
#endif /* LOGLUV_SUPPORT */
added
removed
src/tiff/tif_luv.c
