1 /* $Id: tif_luv.c,v 1.43 2016-09-04 21:32:56 erouault Exp $ */
4 * Copyright (c) 1997 Greg Ward Larson
5 * Copyright (c) 1997 Silicon Graphics, Inc.
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.
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.
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
33 * LogLuv compression support for high dynamic range images.
35 * Contributed by Greg Larson.
37 * LogLuv image support uses the TIFF library to store 16 or 10-bit
38 * log luminance values with 8 bits each of u and v or a 14-bit index.
40 * The codec can take as input and produce as output 32-bit IEEE float values
41 * as well as 16-bit integer values. A 16-bit luminance is interpreted
42 * as a sign bit followed by a 15-bit integer that is converted
43 * to and from a linear magnitude using the transformation:
45 * L = 2^( (Le+.5)/256 - 64 ) # real from 15-bit
47 * Le = floor( 256*(log2(L) + 64) ) # 15-bit from real
49 * The actual conversion to world luminance units in candelas per sq. meter
50 * requires an additional multiplier, which is stored in the TIFFTAG_STONITS.
51 * This value is usually set such that a reasonable exposure comes from
52 * clamping decoded luminances above 1 to 1 in the displayed image.
54 * The 16-bit values for u and v may be converted to real values by dividing
55 * each by 32768. (This allows for negative values, which aren't useful as
56 * far as we know, but are left in case of future improvements in human
59 * Conversion from (u,v), which is actually the CIE (u',v') system for
60 * you color scientists, is accomplished by the following transformation:
62 * u = 4*x / (-2*x + 12*y + 3)
63 * v = 9*y / (-2*x + 12*y + 3)
65 * x = 9*u / (6*u - 16*v + 12)
66 * y = 4*v / (6*u - 16*v + 12)
68 * This process is greatly simplified by passing 32-bit IEEE floats
69 * for each of three CIE XYZ coordinates. The codec then takes care
70 * of conversion to and from LogLuv, though the application is still
71 * responsible for interpreting the TIFFTAG_STONITS calibration factor.
73 * By definition, a CIE XYZ vector of [1 1 1] corresponds to a neutral white
74 * point of (x,y)=(1/3,1/3). However, most color systems assume some other
75 * white point, such as D65, and an absolute color conversion to XYZ then
76 * to another color space with a different white point may introduce an
77 * unwanted color cast to the image. It is often desirable, therefore, to
78 * perform a white point conversion that maps the input white to [1 1 1]
79 * in XYZ, then record the original white point using the TIFFTAG_WHITEPOINT
80 * tag value. A decoder that demands absolute color calibration may use
81 * this white point tag to get back the original colors, but usually it
82 * will be ignored and the new white point will be used instead that
83 * matches the output color space.
85 * Pixel information is compressed into one of two basic encodings, depending
86 * on the setting of the compression tag, which is one of COMPRESSION_SGILOG
87 * or COMPRESSION_SGILOG24. For COMPRESSION_SGILOG, greyscale data is
93 * COMPRESSION_SGILOG color data is stored as:
96 * |-+---------------|--------+--------|
99 * For the 24-bit COMPRESSION_SGILOG24 color format, the data is stored as:
102 * |----------|--------------|
105 * There is no sign bit in the 24-bit case, and the (u,v) chromaticity is
106 * encoded as an index for optimal color resolution. The 10 log bits are
107 * defined by the following conversions:
109 * L = 2^((Le'+.5)/64 - 12) # real from 10-bit
111 * Le' = floor( 64*(log2(L) + 12) ) # 10-bit from real
113 * The 10 bits of the smaller format may be converted into the 15 bits of
114 * the larger format by multiplying by 4 and adding 13314. Obviously,
115 * a smaller range of magnitudes is covered (about 5 orders of magnitude
116 * instead of 38), and the lack of a sign bit means that negative luminances
117 * are not allowed. (Well, they aren't allowed in the real world, either,
118 * but they are useful for certain types of image processing.)
120 * The desired user format is controlled by the setting the internal
121 * pseudo tag TIFFTAG_SGILOGDATAFMT to one of:
122 * SGILOGDATAFMT_FLOAT = IEEE 32-bit float XYZ values
123 * SGILOGDATAFMT_16BIT = 16-bit integer encodings of logL, u and v
124 * Raw data i/o is also possible using:
125 * SGILOGDATAFMT_RAW = 32-bit unsigned integer with encoded pixel
126 * In addition, the following decoding is provided for ease of display:
127 * SGILOGDATAFMT_8BIT = 8-bit default RGB gamma-corrected values
129 * For grayscale images, we provide the following data formats:
130 * SGILOGDATAFMT_FLOAT = IEEE 32-bit float Y values
131 * SGILOGDATAFMT_16BIT = 16-bit integer w/ encoded luminance
132 * SGILOGDATAFMT_8BIT = 8-bit gray monitor values
134 * Note that the COMPRESSION_SGILOG applies a simple run-length encoding
135 * scheme by separating the logL, u and v bytes for each row and applying
136 * a PackBits type of compression. Since the 24-bit encoding is not
137 * adaptive, the 32-bit color format takes less space in many cases.
139 * Further control is provided over the conversion from higher-resolution
140 * formats to final encoded values through the pseudo tag
141 * TIFFTAG_SGILOGENCODE:
142 * SGILOGENCODE_NODITHER = do not dither encoded values
143 * SGILOGENCODE_RANDITHER = apply random dithering during encoding
145 * The default value of this tag is SGILOGENCODE_NODITHER for
146 * COMPRESSION_SGILOG to maximize run-length encoding and
147 * SGILOGENCODE_RANDITHER for COMPRESSION_SGILOG24 to turn
148 * quantization errors into noise.
156 * State block for each open TIFF
157 * file using LogLuv compression/decompression.
159 typedef struct logLuvState LogLuvState
;
162 int user_datafmt
; /* user data format */
163 int encode_meth
; /* encoding method */
164 int pixel_size
; /* bytes per pixel */
166 uint8
* tbuf
; /* translation buffer */
167 tmsize_t tbuflen
; /* buffer length */
168 void (*tfunc
)(LogLuvState
*, uint8
*, tmsize_t
);
170 TIFFVSetMethod vgetparent
; /* super-class method */
171 TIFFVSetMethod vsetparent
; /* super-class method */
174 #define DecoderState(tif) ((LogLuvState*) (tif)->tif_data)
175 #define EncoderState(tif) ((LogLuvState*) (tif)->tif_data)
177 #define SGILOGDATAFMT_UNKNOWN -1
179 #define MINRUN 4 /* minimum run length */
182 * Decode a string of 16-bit gray pixels.
185 LogL16Decode(TIFF
* tif
, uint8
* op
, tmsize_t occ
, uint16 s
)
187 static const char module
[] = "LogL16Decode";
188 LogLuvState
* sp
= DecoderState(tif
);
201 npixels
= occ
/ sp
->pixel_size
;
203 if (sp
->user_datafmt
== SGILOGDATAFMT_16BIT
)
206 if(sp
->tbuflen
< npixels
) {
207 TIFFErrorExt(tif
->tif_clientdata
, module
,
208 "Translation buffer too short");
211 tp
= (int16
*) sp
->tbuf
;
213 _TIFFmemset((void*) tp
, 0, npixels
*sizeof (tp
[0]));
215 bp
= (unsigned char*) tif
->tif_rawcp
;
217 /* get each byte string */
218 for (shft
= 2*8; (shft
-= 8) >= 0; ) {
219 for (i
= 0; i
< npixels
&& cc
> 0; ) {
220 if (*bp
>= 128) { /* run */
223 rc
= *bp
++ + (2-128);
224 b
= (int16
)(*bp
++ << shft
);
226 while (rc
-- && i
< npixels
)
228 } else { /* non-run */
229 rc
= *bp
++; /* nul is noop */
230 while (--cc
&& rc
-- && i
< npixels
)
231 tp
[i
++] |= (int16
)*bp
++ << shft
;
235 #if defined(__WIN32__) && (defined(_MSC_VER) || defined(__MINGW32__))
236 TIFFErrorExt(tif
->tif_clientdata
, module
,
237 "Not enough data at row %lu (short %I64d pixels)",
238 (unsigned long) tif
->tif_row
,
239 (unsigned __int64
) (npixels
- i
));
241 TIFFErrorExt(tif
->tif_clientdata
, module
,
242 "Not enough data at row %lu (short %llu pixels)",
243 (unsigned long) tif
->tif_row
,
244 (unsigned long long) (npixels
- i
));
246 tif
->tif_rawcp
= (uint8
*) bp
;
251 (*sp
->tfunc
)(sp
, op
, npixels
);
252 tif
->tif_rawcp
= (uint8
*) bp
;
258 * Decode a string of 24-bit pixels.
261 LogLuvDecode24(TIFF
* tif
, uint8
* op
, tmsize_t occ
, uint16 s
)
263 static const char module
[] = "LogLuvDecode24";
264 LogLuvState
* sp
= DecoderState(tif
);
274 npixels
= occ
/ sp
->pixel_size
;
276 if (sp
->user_datafmt
== SGILOGDATAFMT_RAW
)
279 if(sp
->tbuflen
< npixels
) {
280 TIFFErrorExt(tif
->tif_clientdata
, module
,
281 "Translation buffer too short");
284 tp
= (uint32
*) sp
->tbuf
;
286 /* copy to array of uint32 */
287 bp
= (unsigned char*) tif
->tif_rawcp
;
289 for (i
= 0; i
< npixels
&& cc
>= 3; i
++) {
290 tp
[i
] = bp
[0] << 16 | bp
[1] << 8 | bp
[2];
294 tif
->tif_rawcp
= (uint8
*) bp
;
297 #if defined(__WIN32__) && (defined(_MSC_VER) || defined(__MINGW32__))
298 TIFFErrorExt(tif
->tif_clientdata
, module
,
299 "Not enough data at row %lu (short %I64d pixels)",
300 (unsigned long) tif
->tif_row
,
301 (unsigned __int64
) (npixels
- i
));
303 TIFFErrorExt(tif
->tif_clientdata
, module
,
304 "Not enough data at row %lu (short %llu pixels)",
305 (unsigned long) tif
->tif_row
,
306 (unsigned long long) (npixels
- i
));
310 (*sp
->tfunc
)(sp
, op
, npixels
);
315 * Decode a string of 32-bit pixels.
318 LogLuvDecode32(TIFF
* tif
, uint8
* op
, tmsize_t occ
, uint16 s
)
320 static const char module
[] = "LogLuvDecode32";
332 sp
= DecoderState(tif
);
335 npixels
= occ
/ sp
->pixel_size
;
337 if (sp
->user_datafmt
== SGILOGDATAFMT_RAW
)
340 if(sp
->tbuflen
< npixels
) {
341 TIFFErrorExt(tif
->tif_clientdata
, module
,
342 "Translation buffer too short");
345 tp
= (uint32
*) sp
->tbuf
;
347 _TIFFmemset((void*) tp
, 0, npixels
*sizeof (tp
[0]));
349 bp
= (unsigned char*) tif
->tif_rawcp
;
351 /* get each byte string */
352 for (shft
= 4*8; (shft
-= 8) >= 0; ) {
353 for (i
= 0; i
< npixels
&& cc
> 0; ) {
354 if (*bp
>= 128) { /* run */
357 rc
= *bp
++ + (2-128);
358 b
= (uint32
)*bp
++ << shft
;
360 while (rc
-- && i
< npixels
)
362 } else { /* non-run */
363 rc
= *bp
++; /* nul is noop */
364 while (--cc
&& rc
-- && i
< npixels
)
365 tp
[i
++] |= (uint32
)*bp
++ << shft
;
369 #if defined(__WIN32__) && (defined(_MSC_VER) || defined(__MINGW32__))
370 TIFFErrorExt(tif
->tif_clientdata
, module
,
371 "Not enough data at row %lu (short %I64d pixels)",
372 (unsigned long) tif
->tif_row
,
373 (unsigned __int64
) (npixels
- i
));
375 TIFFErrorExt(tif
->tif_clientdata
, module
,
376 "Not enough data at row %lu (short %llu pixels)",
377 (unsigned long) tif
->tif_row
,
378 (unsigned long long) (npixels
- i
));
380 tif
->tif_rawcp
= (uint8
*) bp
;
385 (*sp
->tfunc
)(sp
, op
, npixels
);
386 tif
->tif_rawcp
= (uint8
*) bp
;
392 * Decode a strip of pixels. We break it into rows to
393 * maintain synchrony with the encode algorithm, which
397 LogLuvDecodeStrip(TIFF
* tif
, uint8
* bp
, tmsize_t cc
, uint16 s
)
399 tmsize_t rowlen
= TIFFScanlineSize(tif
);
404 assert(cc
%rowlen
== 0);
405 while (cc
&& (*tif
->tif_decoderow
)(tif
, bp
, rowlen
, s
)) {
413 * Decode a tile of pixels. We break it into rows to
414 * maintain synchrony with the encode algorithm, which
418 LogLuvDecodeTile(TIFF
* tif
, uint8
* bp
, tmsize_t cc
, uint16 s
)
420 tmsize_t rowlen
= TIFFTileRowSize(tif
);
425 assert(cc
%rowlen
== 0);
426 while (cc
&& (*tif
->tif_decoderow
)(tif
, bp
, rowlen
, s
)) {
434 * Encode a row of 16-bit pixels.
437 LogL16Encode(TIFF
* tif
, uint8
* bp
, tmsize_t cc
, uint16 s
)
439 static const char module
[] = "LogL16Encode";
440 LogLuvState
* sp
= EncoderState(tif
);
454 npixels
= cc
/ sp
->pixel_size
;
456 if (sp
->user_datafmt
== SGILOGDATAFMT_16BIT
)
459 tp
= (int16
*) sp
->tbuf
;
460 if(sp
->tbuflen
< npixels
) {
461 TIFFErrorExt(tif
->tif_clientdata
, module
,
462 "Translation buffer too short");
465 (*sp
->tfunc
)(sp
, bp
, npixels
);
467 /* compress each byte string */
469 occ
= tif
->tif_rawdatasize
- tif
->tif_rawcc
;
470 for (shft
= 2*8; (shft
-= 8) >= 0; )
471 for (i
= 0; i
< npixels
; i
+= rc
) {
474 tif
->tif_rawcc
= tif
->tif_rawdatasize
- occ
;
475 if (!TIFFFlushData1(tif
))
478 occ
= tif
->tif_rawdatasize
- tif
->tif_rawcc
;
480 mask
= 0xff << shft
; /* find next run */
481 for (beg
= i
; beg
< npixels
; beg
+= rc
) {
482 b
= (int16
) (tp
[beg
] & mask
);
484 while (rc
< 127+2 && beg
+rc
< npixels
&&
485 (tp
[beg
+rc
] & mask
) == b
)
488 break; /* long enough */
490 if (beg
-i
> 1 && beg
-i
< MINRUN
) {
491 b
= (int16
) (tp
[i
] & mask
);/*check short run */
493 while ((tp
[j
++] & mask
) == b
)
495 *op
++ = (uint8
)(128-2+j
-i
);
496 *op
++ = (uint8
)(b
>> shft
);
502 while (i
< beg
) { /* write out non-run */
503 if ((j
= beg
-i
) > 127) j
= 127;
506 tif
->tif_rawcc
= tif
->tif_rawdatasize
- occ
;
507 if (!TIFFFlushData1(tif
))
510 occ
= tif
->tif_rawdatasize
- tif
->tif_rawcc
;
512 *op
++ = (uint8
) j
; occ
--;
514 *op
++ = (uint8
) (tp
[i
++] >> shft
& 0xff);
518 if (rc
>= MINRUN
) { /* write out run */
519 *op
++ = (uint8
) (128-2+rc
);
520 *op
++ = (uint8
) (tp
[beg
] >> shft
& 0xff);
526 tif
->tif_rawcc
= tif
->tif_rawdatasize
- occ
;
532 * Encode a row of 24-bit pixels.
535 LogLuvEncode24(TIFF
* tif
, uint8
* bp
, tmsize_t cc
, uint16 s
)
537 static const char module
[] = "LogLuvEncode24";
538 LogLuvState
* sp
= EncoderState(tif
);
547 npixels
= cc
/ sp
->pixel_size
;
549 if (sp
->user_datafmt
== SGILOGDATAFMT_RAW
)
552 tp
= (uint32
*) sp
->tbuf
;
553 if(sp
->tbuflen
< npixels
) {
554 TIFFErrorExt(tif
->tif_clientdata
, module
,
555 "Translation buffer too short");
558 (*sp
->tfunc
)(sp
, bp
, npixels
);
560 /* write out encoded pixels */
562 occ
= tif
->tif_rawdatasize
- tif
->tif_rawcc
;
563 for (i
= npixels
; i
--; ) {
566 tif
->tif_rawcc
= tif
->tif_rawdatasize
- occ
;
567 if (!TIFFFlushData1(tif
))
570 occ
= tif
->tif_rawdatasize
- tif
->tif_rawcc
;
572 *op
++ = (uint8
)(*tp
>> 16);
573 *op
++ = (uint8
)(*tp
>> 8 & 0xff);
574 *op
++ = (uint8
)(*tp
++ & 0xff);
578 tif
->tif_rawcc
= tif
->tif_rawdatasize
- occ
;
584 * Encode a row of 32-bit pixels.
587 LogLuvEncode32(TIFF
* tif
, uint8
* bp
, tmsize_t cc
, uint16 s
)
589 static const char module
[] = "LogLuvEncode32";
590 LogLuvState
* sp
= EncoderState(tif
);
605 npixels
= cc
/ sp
->pixel_size
;
607 if (sp
->user_datafmt
== SGILOGDATAFMT_RAW
)
610 tp
= (uint32
*) sp
->tbuf
;
611 if(sp
->tbuflen
< npixels
) {
612 TIFFErrorExt(tif
->tif_clientdata
, module
,
613 "Translation buffer too short");
616 (*sp
->tfunc
)(sp
, bp
, npixels
);
618 /* compress each byte string */
620 occ
= tif
->tif_rawdatasize
- tif
->tif_rawcc
;
621 for (shft
= 4*8; (shft
-= 8) >= 0; )
622 for (i
= 0; i
< npixels
; i
+= rc
) {
625 tif
->tif_rawcc
= tif
->tif_rawdatasize
- occ
;
626 if (!TIFFFlushData1(tif
))
629 occ
= tif
->tif_rawdatasize
- tif
->tif_rawcc
;
631 mask
= 0xff << shft
; /* find next run */
632 for (beg
= i
; beg
< npixels
; beg
+= rc
) {
635 while (rc
< 127+2 && beg
+rc
< npixels
&&
636 (tp
[beg
+rc
] & mask
) == b
)
639 break; /* long enough */
641 if (beg
-i
> 1 && beg
-i
< MINRUN
) {
642 b
= tp
[i
] & mask
; /* check short run */
644 while ((tp
[j
++] & mask
) == b
)
646 *op
++ = (uint8
)(128-2+j
-i
);
647 *op
++ = (uint8
)(b
>> shft
);
653 while (i
< beg
) { /* write out non-run */
654 if ((j
= beg
-i
) > 127) j
= 127;
657 tif
->tif_rawcc
= tif
->tif_rawdatasize
- occ
;
658 if (!TIFFFlushData1(tif
))
661 occ
= tif
->tif_rawdatasize
- tif
->tif_rawcc
;
663 *op
++ = (uint8
) j
; occ
--;
665 *op
++ = (uint8
)(tp
[i
++] >> shft
& 0xff);
669 if (rc
>= MINRUN
) { /* write out run */
670 *op
++ = (uint8
) (128-2+rc
);
671 *op
++ = (uint8
)(tp
[beg
] >> shft
& 0xff);
677 tif
->tif_rawcc
= tif
->tif_rawdatasize
- occ
;
683 * Encode a strip of pixels. We break it into rows to
684 * avoid encoding runs across row boundaries.
687 LogLuvEncodeStrip(TIFF
* tif
, uint8
* bp
, tmsize_t cc
, uint16 s
)
689 tmsize_t rowlen
= TIFFScanlineSize(tif
);
694 assert(cc
%rowlen
== 0);
695 while (cc
&& (*tif
->tif_encoderow
)(tif
, bp
, rowlen
, s
) == 1) {
703 * Encode a tile of pixels. We break it into rows to
704 * avoid encoding runs across row boundaries.
707 LogLuvEncodeTile(TIFF
* tif
, uint8
* bp
, tmsize_t cc
, uint16 s
)
709 tmsize_t rowlen
= TIFFTileRowSize(tif
);
714 assert(cc
%rowlen
== 0);
715 while (cc
&& (*tif
->tif_encoderow
)(tif
, bp
, rowlen
, s
) == 1) {
723 * Encode/Decode functions for converting to and from user formats.
729 #define U_NEU 0.210526316
730 #define V_NEU 0.473684211
735 #define M_LN2 0.69314718055994530942
738 #define M_PI 3.14159265358979323846
740 #undef log2 /* Conflict with C'99 function */
741 #define log2(x) ((1./M_LN2)*log(x))
742 #undef exp2 /* Conflict with C'99 function */
743 #define exp2(x) exp(M_LN2*(x))
745 #define itrunc(x,m) ((m)==SGILOGENCODE_NODITHER ? \
747 (int)((x) + rand()*(1./RAND_MAX) - .5))
753 LogL16toY(int p16
) /* compute luminance from 16-bit LogL */
755 int Le
= p16
& 0x7fff;
760 Y
= exp(M_LN2
/256.*(Le
+.5) - M_LN2
*64.);
761 return (!(p16
& 0x8000) ? Y
: -Y
);
768 LogL16fromY(double Y
, int em
) /* get 16-bit LogL from Y */
770 if (Y
>= 1.8371976e19
)
772 if (Y
<= -1.8371976e19
)
774 if (Y
> 5.4136769e-20)
775 return itrunc(256.*(log2(Y
) + 64.), em
);
776 if (Y
< -5.4136769e-20)
777 return (~0x7fff | itrunc(256.*(log2(-Y
) + 64.), em
));
782 L16toY(LogLuvState
* sp
, uint8
* op
, tmsize_t n
)
784 int16
* l16
= (int16
*) sp
->tbuf
;
785 float* yp
= (float*) op
;
788 *yp
++ = (float)LogL16toY(*l16
++);
792 L16toGry(LogLuvState
* sp
, uint8
* op
, tmsize_t n
)
794 int16
* l16
= (int16
*) sp
->tbuf
;
795 uint8
* gp
= (uint8
*) op
;
798 double Y
= LogL16toY(*l16
++);
799 *gp
++ = (uint8
) ((Y
<= 0.) ? 0 : (Y
>= 1.) ? 255 : (int)(256.*sqrt(Y
)));
804 L16fromY(LogLuvState
* sp
, uint8
* op
, tmsize_t n
)
806 int16
* l16
= (int16
*) sp
->tbuf
;
807 float* yp
= (float*) op
;
810 *l16
++ = (int16
) (LogL16fromY(*yp
++, sp
->encode_meth
));
817 XYZtoRGB24(float xyz
[3], uint8 rgb
[3])
820 /* assume CCIR-709 primaries */
821 r
= 2.690*xyz
[0] + -1.276*xyz
[1] + -0.414*xyz
[2];
822 g
= -1.022*xyz
[0] + 1.978*xyz
[1] + 0.044*xyz
[2];
823 b
= 0.061*xyz
[0] + -0.224*xyz
[1] + 1.163*xyz
[2];
824 /* assume 2.0 gamma for speed */
825 /* could use integer sqrt approx., but this is probably faster */
826 rgb
[0] = (uint8
)((r
<=0.) ? 0 : (r
>= 1.) ? 255 : (int)(256.*sqrt(r
)));
827 rgb
[1] = (uint8
)((g
<=0.) ? 0 : (g
>= 1.) ? 255 : (int)(256.*sqrt(g
)));
828 rgb
[2] = (uint8
)((b
<=0.) ? 0 : (b
>= 1.) ? 255 : (int)(256.*sqrt(b
)));
835 LogL10toY(int p10
) /* compute luminance from 10-bit LogL */
839 return (exp(M_LN2
/64.*(p10
+.5) - M_LN2
*12.));
846 LogL10fromY(double Y
, int em
) /* get 10-bit LogL from Y */
850 else if (Y
<= .00024283)
853 return itrunc(64.*(log2(Y
) + 12.), em
);
857 #define uv2ang(u, v) ( (NANGLES*.499999999/M_PI) \
858 * atan2((v)-V_NEU,(u)-U_NEU) + .5*NANGLES )
861 oog_encode(double u
, double v
) /* encode out-of-gamut chroma */
863 static int oog_table
[NANGLES
];
864 static int initialized
= 0;
867 if (!initialized
) { /* set up perimeter table */
868 double eps
[NANGLES
], ua
, va
, ang
, epsa
;
870 for (i
= NANGLES
; i
--; )
872 for (vi
= UV_NVS
; vi
--; ) {
873 va
= UV_VSTART
+ (vi
+.5)*UV_SQSIZ
;
874 ustep
= uv_row
[vi
].nus
-1;
875 if (vi
== UV_NVS
-1 || vi
== 0 || ustep
<= 0)
877 for (ui
= uv_row
[vi
].nus
-1; ui
>= 0; ui
-= ustep
) {
878 ua
= uv_row
[vi
].ustart
+ (ui
+.5)*UV_SQSIZ
;
879 ang
= uv2ang(ua
, va
);
881 epsa
= fabs(ang
- (i
+.5));
883 oog_table
[i
] = uv_row
[vi
].ncum
+ ui
;
888 for (i
= NANGLES
; i
--; ) /* fill any holes */
891 for (i1
= 1; i1
< NANGLES
/2; i1
++)
892 if (eps
[(i
+i1
)%NANGLES
] < 1.5)
894 for (i2
= 1; i2
< NANGLES
/2; i2
++)
895 if (eps
[(i
+NANGLES
-i2
)%NANGLES
] < 1.5)
899 oog_table
[(i
+i1
)%NANGLES
];
902 oog_table
[(i
+NANGLES
-i2
)%NANGLES
];
906 i
= (int) uv2ang(u
, v
); /* look up hue angle */
907 return (oog_table
[i
]);
917 uv_encode(double u
, double v
, int em
) /* encode (u',v') coordinates */
922 return oog_encode(u
, v
);
923 vi
= itrunc((v
- UV_VSTART
)*(1./UV_SQSIZ
), em
);
925 return oog_encode(u
, v
);
926 if (u
< uv_row
[vi
].ustart
)
927 return oog_encode(u
, v
);
928 ui
= itrunc((u
- uv_row
[vi
].ustart
)*(1./UV_SQSIZ
), em
);
929 if (ui
>= uv_row
[vi
].nus
)
930 return oog_encode(u
, v
);
932 return (uv_row
[vi
].ncum
+ ui
);
939 uv_decode(double *up
, double *vp
, int c
) /* decode (u',v') index */
944 if (c
< 0 || c
>= UV_NDIVS
)
946 lower
= 0; /* binary search */
948 while (upper
- lower
> 1) {
949 vi
= (lower
+ upper
) >> 1;
950 ui
= c
- uv_row
[vi
].ncum
;
961 ui
= c
- uv_row
[vi
].ncum
;
962 *up
= uv_row
[vi
].ustart
+ (ui
+.5)*UV_SQSIZ
;
963 *vp
= UV_VSTART
+ (vi
+.5)*UV_SQSIZ
;
971 LogLuv24toXYZ(uint32 p
, float XYZ
[3])
974 double L
, u
, v
, s
, x
, y
;
975 /* decode luminance */
976 L
= LogL10toY(p
>>14 & 0x3ff);
978 XYZ
[0] = XYZ
[1] = XYZ
[2] = 0.;
983 if (uv_decode(&u
, &v
, Ce
) < 0) {
984 u
= U_NEU
; v
= V_NEU
;
986 s
= 1./(6.*u
- 16.*v
+ 12.);
990 XYZ
[0] = (float)(x
/y
* L
);
992 XYZ
[2] = (float)((1.-x
-y
)/y
* L
);
999 LogLuv24fromXYZ(float XYZ
[3], int em
)
1003 /* encode luminance */
1004 Le
= LogL10fromY(XYZ
[1], em
);
1006 s
= XYZ
[0] + 15.*XYZ
[1] + 3.*XYZ
[2];
1007 if (!Le
|| s
<= 0.) {
1014 Ce
= uv_encode(u
, v
, em
);
1015 if (Ce
< 0) /* never happens */
1016 Ce
= uv_encode(U_NEU
, V_NEU
, SGILOGENCODE_NODITHER
);
1017 /* combine encodings */
1018 return (Le
<< 14 | Ce
);
1022 Luv24toXYZ(LogLuvState
* sp
, uint8
* op
, tmsize_t n
)
1024 uint32
* luv
= (uint32
*) sp
->tbuf
;
1025 float* xyz
= (float*) op
;
1028 LogLuv24toXYZ(*luv
, xyz
);
1035 Luv24toLuv48(LogLuvState
* sp
, uint8
* op
, tmsize_t n
)
1037 uint32
* luv
= (uint32
*) sp
->tbuf
;
1038 int16
* luv3
= (int16
*) op
;
1043 *luv3
++ = (int16
)((*luv
>> 12 & 0xffd) + 13314);
1044 if (uv_decode(&u
, &v
, *luv
&0x3fff) < 0) {
1048 *luv3
++ = (int16
)(u
* (1L<<15));
1049 *luv3
++ = (int16
)(v
* (1L<<15));
1055 Luv24toRGB(LogLuvState
* sp
, uint8
* op
, tmsize_t n
)
1057 uint32
* luv
= (uint32
*) sp
->tbuf
;
1058 uint8
* rgb
= (uint8
*) op
;
1063 LogLuv24toXYZ(*luv
++, xyz
);
1064 XYZtoRGB24(xyz
, rgb
);
1070 Luv24fromXYZ(LogLuvState
* sp
, uint8
* op
, tmsize_t n
)
1072 uint32
* luv
= (uint32
*) sp
->tbuf
;
1073 float* xyz
= (float*) op
;
1076 *luv
++ = LogLuv24fromXYZ(xyz
, sp
->encode_meth
);
1082 Luv24fromLuv48(LogLuvState
* sp
, uint8
* op
, tmsize_t n
)
1084 uint32
* luv
= (uint32
*) sp
->tbuf
;
1085 int16
* luv3
= (int16
*) op
;
1092 else if (luv3
[0] >= (1<<12)+3314)
1094 else if (sp
->encode_meth
== SGILOGENCODE_NODITHER
)
1095 Le
= (luv3
[0]-3314) >> 2;
1097 Le
= itrunc(.25*(luv3
[0]-3314.), sp
->encode_meth
);
1099 Ce
= uv_encode((luv3
[1]+.5)/(1<<15), (luv3
[2]+.5)/(1<<15),
1101 if (Ce
< 0) /* never happens */
1102 Ce
= uv_encode(U_NEU
, V_NEU
, SGILOGENCODE_NODITHER
);
1103 *luv
++ = (uint32
)Le
<< 14 | Ce
;
1112 LogLuv32toXYZ(uint32 p
, float XYZ
[3])
1114 double L
, u
, v
, s
, x
, y
;
1115 /* decode luminance */
1116 L
= LogL16toY((int)p
>> 16);
1118 XYZ
[0] = XYZ
[1] = XYZ
[2] = 0.;
1122 u
= 1./UVSCALE
* ((p
>>8 & 0xff) + .5);
1123 v
= 1./UVSCALE
* ((p
& 0xff) + .5);
1124 s
= 1./(6.*u
- 16.*v
+ 12.);
1127 /* convert to XYZ */
1128 XYZ
[0] = (float)(x
/y
* L
);
1130 XYZ
[2] = (float)((1.-x
-y
)/y
* L
);
1137 LogLuv32fromXYZ(float XYZ
[3], int em
)
1139 unsigned int Le
, ue
, ve
;
1141 /* encode luminance */
1142 Le
= (unsigned int)LogL16fromY(XYZ
[1], em
);
1144 s
= XYZ
[0] + 15.*XYZ
[1] + 3.*XYZ
[2];
1145 if (!Le
|| s
<= 0.) {
1152 if (u
<= 0.) ue
= 0;
1153 else ue
= itrunc(UVSCALE
*u
, em
);
1154 if (ue
> 255) ue
= 255;
1155 if (v
<= 0.) ve
= 0;
1156 else ve
= itrunc(UVSCALE
*v
, em
);
1157 if (ve
> 255) ve
= 255;
1158 /* combine encodings */
1159 return (Le
<< 16 | ue
<< 8 | ve
);
1163 Luv32toXYZ(LogLuvState
* sp
, uint8
* op
, tmsize_t n
)
1165 uint32
* luv
= (uint32
*) sp
->tbuf
;
1166 float* xyz
= (float*) op
;
1169 LogLuv32toXYZ(*luv
++, xyz
);
1175 Luv32toLuv48(LogLuvState
* sp
, uint8
* op
, tmsize_t n
)
1177 uint32
* luv
= (uint32
*) sp
->tbuf
;
1178 int16
* luv3
= (int16
*) op
;
1183 *luv3
++ = (int16
)(*luv
>> 16);
1184 u
= 1./UVSCALE
* ((*luv
>>8 & 0xff) + .5);
1185 v
= 1./UVSCALE
* ((*luv
& 0xff) + .5);
1186 *luv3
++ = (int16
)(u
* (1L<<15));
1187 *luv3
++ = (int16
)(v
* (1L<<15));
1193 Luv32toRGB(LogLuvState
* sp
, uint8
* op
, tmsize_t n
)
1195 uint32
* luv
= (uint32
*) sp
->tbuf
;
1196 uint8
* rgb
= (uint8
*) op
;
1201 LogLuv32toXYZ(*luv
++, xyz
);
1202 XYZtoRGB24(xyz
, rgb
);
1208 Luv32fromXYZ(LogLuvState
* sp
, uint8
* op
, tmsize_t n
)
1210 uint32
* luv
= (uint32
*) sp
->tbuf
;
1211 float* xyz
= (float*) op
;
1214 *luv
++ = LogLuv32fromXYZ(xyz
, sp
->encode_meth
);
1220 Luv32fromLuv48(LogLuvState
* sp
, uint8
* op
, tmsize_t n
)
1222 uint32
* luv
= (uint32
*) sp
->tbuf
;
1223 int16
* luv3
= (int16
*) op
;
1225 if (sp
->encode_meth
== SGILOGENCODE_NODITHER
) {
1227 *luv
++ = (uint32
)luv3
[0] << 16 |
1228 (luv3
[1]*(uint32
)(UVSCALE
+.5) >> 7 & 0xff00) |
1229 (luv3
[2]*(uint32
)(UVSCALE
+.5) >> 15 & 0xff);
1235 *luv
++ = (uint32
)luv3
[0] << 16 |
1236 (itrunc(luv3
[1]*(UVSCALE
/(1<<15)), sp
->encode_meth
) << 8 & 0xff00) |
1237 (itrunc(luv3
[2]*(UVSCALE
/(1<<15)), sp
->encode_meth
) & 0xff);
1243 _logLuvNop(LogLuvState
* sp
, uint8
* op
, tmsize_t n
)
1245 (void) sp
; (void) op
; (void) n
;
1249 LogL16GuessDataFmt(TIFFDirectory
*td
)
1251 #define PACK(s,b,f) (((b)<<6)|((s)<<3)|(f))
1252 switch (PACK(td
->td_samplesperpixel
, td
->td_bitspersample
, td
->td_sampleformat
)) {
1253 case PACK(1, 32, SAMPLEFORMAT_IEEEFP
):
1254 return (SGILOGDATAFMT_FLOAT
);
1255 case PACK(1, 16, SAMPLEFORMAT_VOID
):
1256 case PACK(1, 16, SAMPLEFORMAT_INT
):
1257 case PACK(1, 16, SAMPLEFORMAT_UINT
):
1258 return (SGILOGDATAFMT_16BIT
);
1259 case PACK(1, 8, SAMPLEFORMAT_VOID
):
1260 case PACK(1, 8, SAMPLEFORMAT_UINT
):
1261 return (SGILOGDATAFMT_8BIT
);
1264 return (SGILOGDATAFMT_UNKNOWN
);
1268 multiply_ms(tmsize_t m1
, tmsize_t m2
)
1270 tmsize_t bytes
= m1
* m2
;
1272 if (m1
&& bytes
/ m1
!= m2
)
1279 LogL16InitState(TIFF
* tif
)
1281 static const char module
[] = "LogL16InitState";
1282 TIFFDirectory
*td
= &tif
->tif_dir
;
1283 LogLuvState
* sp
= DecoderState(tif
);
1286 assert(td
->td_photometric
== PHOTOMETRIC_LOGL
);
1288 if( td
->td_samplesperpixel
!= 1 )
1290 TIFFErrorExt(tif
->tif_clientdata
, module
,
1291 "Sorry, can not handle LogL image with %s=%d",
1292 "Samples/pixel", td
->td_samplesperpixel
);
1296 /* for some reason, we can't do this in TIFFInitLogL16 */
1297 if (sp
->user_datafmt
== SGILOGDATAFMT_UNKNOWN
)
1298 sp
->user_datafmt
= LogL16GuessDataFmt(td
);
1299 switch (sp
->user_datafmt
) {
1300 case SGILOGDATAFMT_FLOAT
:
1301 sp
->pixel_size
= sizeof (float);
1303 case SGILOGDATAFMT_16BIT
:
1304 sp
->pixel_size
= sizeof (int16
);
1306 case SGILOGDATAFMT_8BIT
:
1307 sp
->pixel_size
= sizeof (uint8
);
1310 TIFFErrorExt(tif
->tif_clientdata
, module
,
1311 "No support for converting user data format to LogL");
1315 sp
->tbuflen
= multiply_ms(td
->td_tilewidth
, td
->td_tilelength
);
1317 sp
->tbuflen
= multiply_ms(td
->td_imagewidth
, td
->td_rowsperstrip
);
1318 if (multiply_ms(sp
->tbuflen
, sizeof (int16
)) == 0 ||
1319 (sp
->tbuf
= (uint8
*) _TIFFmalloc(sp
->tbuflen
* sizeof (int16
))) == NULL
) {
1320 TIFFErrorExt(tif
->tif_clientdata
, module
, "No space for SGILog translation buffer");
1327 LogLuvGuessDataFmt(TIFFDirectory
*td
)
1332 * If the user didn't tell us their datafmt,
1333 * take our best guess from the bitspersample.
1335 #define PACK(a,b) (((a)<<3)|(b))
1336 switch (PACK(td
->td_bitspersample
, td
->td_sampleformat
)) {
1337 case PACK(32, SAMPLEFORMAT_IEEEFP
):
1338 guess
= SGILOGDATAFMT_FLOAT
;
1340 case PACK(32, SAMPLEFORMAT_VOID
):
1341 case PACK(32, SAMPLEFORMAT_UINT
):
1342 case PACK(32, SAMPLEFORMAT_INT
):
1343 guess
= SGILOGDATAFMT_RAW
;
1345 case PACK(16, SAMPLEFORMAT_VOID
):
1346 case PACK(16, SAMPLEFORMAT_INT
):
1347 case PACK(16, SAMPLEFORMAT_UINT
):
1348 guess
= SGILOGDATAFMT_16BIT
;
1350 case PACK( 8, SAMPLEFORMAT_VOID
):
1351 case PACK( 8, SAMPLEFORMAT_UINT
):
1352 guess
= SGILOGDATAFMT_8BIT
;
1355 guess
= SGILOGDATAFMT_UNKNOWN
;
1360 * Double-check samples per pixel.
1362 switch (td
->td_samplesperpixel
) {
1364 if (guess
!= SGILOGDATAFMT_RAW
)
1365 guess
= SGILOGDATAFMT_UNKNOWN
;
1368 if (guess
== SGILOGDATAFMT_RAW
)
1369 guess
= SGILOGDATAFMT_UNKNOWN
;
1372 guess
= SGILOGDATAFMT_UNKNOWN
;
1379 LogLuvInitState(TIFF
* tif
)
1381 static const char module
[] = "LogLuvInitState";
1382 TIFFDirectory
* td
= &tif
->tif_dir
;
1383 LogLuvState
* sp
= DecoderState(tif
);
1386 assert(td
->td_photometric
== PHOTOMETRIC_LOGLUV
);
1388 /* for some reason, we can't do this in TIFFInitLogLuv */
1389 if (td
->td_planarconfig
!= PLANARCONFIG_CONTIG
) {
1390 TIFFErrorExt(tif
->tif_clientdata
, module
,
1391 "SGILog compression cannot handle non-contiguous data");
1394 if (sp
->user_datafmt
== SGILOGDATAFMT_UNKNOWN
)
1395 sp
->user_datafmt
= LogLuvGuessDataFmt(td
);
1396 switch (sp
->user_datafmt
) {
1397 case SGILOGDATAFMT_FLOAT
:
1398 sp
->pixel_size
= 3*sizeof (float);
1400 case SGILOGDATAFMT_16BIT
:
1401 sp
->pixel_size
= 3*sizeof (int16
);
1403 case SGILOGDATAFMT_RAW
:
1404 sp
->pixel_size
= sizeof (uint32
);
1406 case SGILOGDATAFMT_8BIT
:
1407 sp
->pixel_size
= 3*sizeof (uint8
);
1410 TIFFErrorExt(tif
->tif_clientdata
, module
,
1411 "No support for converting user data format to LogLuv");
1415 sp
->tbuflen
= multiply_ms(td
->td_tilewidth
, td
->td_tilelength
);
1417 sp
->tbuflen
= multiply_ms(td
->td_imagewidth
, td
->td_rowsperstrip
);
1418 if (multiply_ms(sp
->tbuflen
, sizeof (uint32
)) == 0 ||
1419 (sp
->tbuf
= (uint8
*) _TIFFmalloc(sp
->tbuflen
* sizeof (uint32
))) == NULL
) {
1420 TIFFErrorExt(tif
->tif_clientdata
, module
, "No space for SGILog translation buffer");
1427 LogLuvFixupTags(TIFF
* tif
)
1434 LogLuvSetupDecode(TIFF
* tif
)
1436 static const char module
[] = "LogLuvSetupDecode";
1437 LogLuvState
* sp
= DecoderState(tif
);
1438 TIFFDirectory
* td
= &tif
->tif_dir
;
1440 tif
->tif_postdecode
= _TIFFNoPostDecode
;
1441 switch (td
->td_photometric
) {
1442 case PHOTOMETRIC_LOGLUV
:
1443 if (!LogLuvInitState(tif
))
1445 if (td
->td_compression
== COMPRESSION_SGILOG24
) {
1446 tif
->tif_decoderow
= LogLuvDecode24
;
1447 switch (sp
->user_datafmt
) {
1448 case SGILOGDATAFMT_FLOAT
:
1449 sp
->tfunc
= Luv24toXYZ
;
1451 case SGILOGDATAFMT_16BIT
:
1452 sp
->tfunc
= Luv24toLuv48
;
1454 case SGILOGDATAFMT_8BIT
:
1455 sp
->tfunc
= Luv24toRGB
;
1459 tif
->tif_decoderow
= LogLuvDecode32
;
1460 switch (sp
->user_datafmt
) {
1461 case SGILOGDATAFMT_FLOAT
:
1462 sp
->tfunc
= Luv32toXYZ
;
1464 case SGILOGDATAFMT_16BIT
:
1465 sp
->tfunc
= Luv32toLuv48
;
1467 case SGILOGDATAFMT_8BIT
:
1468 sp
->tfunc
= Luv32toRGB
;
1473 case PHOTOMETRIC_LOGL
:
1474 if (!LogL16InitState(tif
))
1476 tif
->tif_decoderow
= LogL16Decode
;
1477 switch (sp
->user_datafmt
) {
1478 case SGILOGDATAFMT_FLOAT
:
1481 case SGILOGDATAFMT_8BIT
:
1482 sp
->tfunc
= L16toGry
;
1487 TIFFErrorExt(tif
->tif_clientdata
, module
,
1488 "Inappropriate photometric interpretation %d for SGILog compression; %s",
1489 td
->td_photometric
, "must be either LogLUV or LogL");
1496 LogLuvSetupEncode(TIFF
* tif
)
1498 static const char module
[] = "LogLuvSetupEncode";
1499 LogLuvState
* sp
= EncoderState(tif
);
1500 TIFFDirectory
* td
= &tif
->tif_dir
;
1502 switch (td
->td_photometric
) {
1503 case PHOTOMETRIC_LOGLUV
:
1504 if (!LogLuvInitState(tif
))
1506 if (td
->td_compression
== COMPRESSION_SGILOG24
) {
1507 tif
->tif_encoderow
= LogLuvEncode24
;
1508 switch (sp
->user_datafmt
) {
1509 case SGILOGDATAFMT_FLOAT
:
1510 sp
->tfunc
= Luv24fromXYZ
;
1512 case SGILOGDATAFMT_16BIT
:
1513 sp
->tfunc
= Luv24fromLuv48
;
1515 case SGILOGDATAFMT_RAW
:
1521 tif
->tif_encoderow
= LogLuvEncode32
;
1522 switch (sp
->user_datafmt
) {
1523 case SGILOGDATAFMT_FLOAT
:
1524 sp
->tfunc
= Luv32fromXYZ
;
1526 case SGILOGDATAFMT_16BIT
:
1527 sp
->tfunc
= Luv32fromLuv48
;
1529 case SGILOGDATAFMT_RAW
:
1536 case PHOTOMETRIC_LOGL
:
1537 if (!LogL16InitState(tif
))
1539 tif
->tif_encoderow
= LogL16Encode
;
1540 switch (sp
->user_datafmt
) {
1541 case SGILOGDATAFMT_FLOAT
:
1542 sp
->tfunc
= L16fromY
;
1544 case SGILOGDATAFMT_16BIT
:
1551 TIFFErrorExt(tif
->tif_clientdata
, module
,
1552 "Inappropriate photometric interpretation %d for SGILog compression; %s",
1553 td
->td_photometric
, "must be either LogLUV or LogL");
1558 TIFFErrorExt(tif
->tif_clientdata
, module
,
1559 "SGILog compression supported only for %s, or raw data",
1560 td
->td_photometric
== PHOTOMETRIC_LOGL
? "Y, L" : "XYZ, Luv");
1565 LogLuvClose(TIFF
* tif
)
1567 TIFFDirectory
*td
= &tif
->tif_dir
;
1570 * For consistency, we always want to write out the same
1571 * bitspersample and sampleformat for our TIFF file,
1572 * regardless of the data format being used by the application.
1573 * Since this routine is called after tags have been set but
1574 * before they have been recorded in the file, we reset them here.
1576 td
->td_samplesperpixel
=
1577 (td
->td_photometric
== PHOTOMETRIC_LOGL
) ? 1 : 3;
1578 td
->td_bitspersample
= 16;
1579 td
->td_sampleformat
= SAMPLEFORMAT_INT
;
1583 LogLuvCleanup(TIFF
* tif
)
1585 LogLuvState
* sp
= (LogLuvState
*)tif
->tif_data
;
1589 tif
->tif_tagmethods
.vgetfield
= sp
->vgetparent
;
1590 tif
->tif_tagmethods
.vsetfield
= sp
->vsetparent
;
1593 _TIFFfree(sp
->tbuf
);
1595 tif
->tif_data
= NULL
;
1597 _TIFFSetDefaultCompressionState(tif
);
1601 LogLuvVSetField(TIFF
* tif
, uint32 tag
, va_list ap
)
1603 static const char module
[] = "LogLuvVSetField";
1604 LogLuvState
* sp
= DecoderState(tif
);
1608 case TIFFTAG_SGILOGDATAFMT
:
1609 sp
->user_datafmt
= (int) va_arg(ap
, int);
1611 * Tweak the TIFF header so that the rest of libtiff knows what
1612 * size of data will be passed between app and library, and
1613 * assume that the app knows what it is doing and is not
1614 * confused by these header manipulations...
1616 switch (sp
->user_datafmt
) {
1617 case SGILOGDATAFMT_FLOAT
:
1619 fmt
= SAMPLEFORMAT_IEEEFP
;
1621 case SGILOGDATAFMT_16BIT
:
1623 fmt
= SAMPLEFORMAT_INT
;
1625 case SGILOGDATAFMT_RAW
:
1627 fmt
= SAMPLEFORMAT_UINT
;
1628 TIFFSetField(tif
, TIFFTAG_SAMPLESPERPIXEL
, 1);
1630 case SGILOGDATAFMT_8BIT
:
1632 fmt
= SAMPLEFORMAT_UINT
;
1635 TIFFErrorExt(tif
->tif_clientdata
, tif
->tif_name
,
1636 "Unknown data format %d for LogLuv compression",
1640 TIFFSetField(tif
, TIFFTAG_BITSPERSAMPLE
, bps
);
1641 TIFFSetField(tif
, TIFFTAG_SAMPLEFORMAT
, fmt
);
1643 * Must recalculate sizes should bits/sample change.
1645 tif
->tif_tilesize
= isTiled(tif
) ? TIFFTileSize(tif
) : (tmsize_t
) -1;
1646 tif
->tif_scanlinesize
= TIFFScanlineSize(tif
);
1648 case TIFFTAG_SGILOGENCODE
:
1649 sp
->encode_meth
= (int) va_arg(ap
, int);
1650 if (sp
->encode_meth
!= SGILOGENCODE_NODITHER
&&
1651 sp
->encode_meth
!= SGILOGENCODE_RANDITHER
) {
1652 TIFFErrorExt(tif
->tif_clientdata
, module
,
1653 "Unknown encoding %d for LogLuv compression",
1659 return (*sp
->vsetparent
)(tif
, tag
, ap
);
1664 LogLuvVGetField(TIFF
* tif
, uint32 tag
, va_list ap
)
1666 LogLuvState
*sp
= (LogLuvState
*)tif
->tif_data
;
1669 case TIFFTAG_SGILOGDATAFMT
:
1670 *va_arg(ap
, int*) = sp
->user_datafmt
;
1673 return (*sp
->vgetparent
)(tif
, tag
, ap
);
1677 static const TIFFField LogLuvFields
[] = {
1678 { TIFFTAG_SGILOGDATAFMT
, 0, 0, TIFF_SHORT
, 0, TIFF_SETGET_INT
, TIFF_SETGET_UNDEFINED
, FIELD_PSEUDO
, TRUE
, FALSE
, "SGILogDataFmt", NULL
},
1679 { TIFFTAG_SGILOGENCODE
, 0, 0, TIFF_SHORT
, 0, TIFF_SETGET_INT
, TIFF_SETGET_UNDEFINED
, FIELD_PSEUDO
, TRUE
, FALSE
, "SGILogEncode", NULL
}
1683 TIFFInitSGILog(TIFF
* tif
, int scheme
)
1685 static const char module
[] = "TIFFInitSGILog";
1688 assert(scheme
== COMPRESSION_SGILOG24
|| scheme
== COMPRESSION_SGILOG
);
1691 * Merge codec-specific tag information.
1693 if (!_TIFFMergeFields(tif
, LogLuvFields
,
1694 TIFFArrayCount(LogLuvFields
))) {
1695 TIFFErrorExt(tif
->tif_clientdata
, module
,
1696 "Merging SGILog codec-specific tags failed");
1701 * Allocate state block so tag methods have storage to record values.
1703 tif
->tif_data
= (uint8
*) _TIFFmalloc(sizeof (LogLuvState
));
1704 if (tif
->tif_data
== NULL
)
1706 sp
= (LogLuvState
*) tif
->tif_data
;
1707 _TIFFmemset((void*)sp
, 0, sizeof (*sp
));
1708 sp
->user_datafmt
= SGILOGDATAFMT_UNKNOWN
;
1709 sp
->encode_meth
= (scheme
== COMPRESSION_SGILOG24
) ?
1710 SGILOGENCODE_RANDITHER
: SGILOGENCODE_NODITHER
;
1711 sp
->tfunc
= _logLuvNop
;
1714 * Install codec methods.
1715 * NB: tif_decoderow & tif_encoderow are filled
1718 tif
->tif_fixuptags
= LogLuvFixupTags
;
1719 tif
->tif_setupdecode
= LogLuvSetupDecode
;
1720 tif
->tif_decodestrip
= LogLuvDecodeStrip
;
1721 tif
->tif_decodetile
= LogLuvDecodeTile
;
1722 tif
->tif_setupencode
= LogLuvSetupEncode
;
1723 tif
->tif_encodestrip
= LogLuvEncodeStrip
;
1724 tif
->tif_encodetile
= LogLuvEncodeTile
;
1725 tif
->tif_close
= LogLuvClose
;
1726 tif
->tif_cleanup
= LogLuvCleanup
;
1729 * Override parent get/set field methods.
1731 sp
->vgetparent
= tif
->tif_tagmethods
.vgetfield
;
1732 tif
->tif_tagmethods
.vgetfield
= LogLuvVGetField
; /* hook for codec tags */
1733 sp
->vsetparent
= tif
->tif_tagmethods
.vsetfield
;
1734 tif
->tif_tagmethods
.vsetfield
= LogLuvVSetField
; /* hook for codec tags */
1738 TIFFErrorExt(tif
->tif_clientdata
, module
,
1739 "%s: No space for LogLuv state block", tif
->tif_name
);
1742 #endif /* LOGLUV_SUPPORT */
1744 /* vim: set ts=8 sts=8 sw=8 noet: */