PageRenderTime 104ms CodeModel.GetById 13ms app.highlight 79ms RepoModel.GetById 0ms app.codeStats 1ms

/src/FreeImage/Source/LibTIFF/tif_luv.c

https://bitbucket.org/cabalistic/ogredeps/
C | 1629 lines | 1236 code | 139 blank | 254 comment | 264 complexity | 6dc33f76b99662526460cac9aadce7c1 MD5 | raw file
   1/* $Id: tif_luv.c,v 1.37 2011/04/10 17:14:09 drolon 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 */
 158typedef	struct logLuvState LogLuvState;
 159
 160struct 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 */
 183static int
 184LogL16Decode(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) {
 223			TIFFErrorExt(tif->tif_clientdata, 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;
 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 */
 240static int
 241LogLuvDecode24(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) {
 270		TIFFErrorExt(tif->tif_clientdata, tif->tif_name,
 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 */
 282static int
 283LogLuvDecode32(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) {
 323			TIFFErrorExt(tif->tif_clientdata, 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;
 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 */
 342static int
 343LogLuvDecodeStrip(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 */
 358static int
 359LogLuvDecodeTile(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 */
 372static int
 373LogL16Encode(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 (1);
 455}
 456
 457/*
 458 * Encode a row of 24-bit pixels.
 459 */
 460static int
 461LogLuvEncode24(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 (1);
 500}
 501
 502/*
 503 * Encode a row of 32-bit pixels.
 504 */
 505static int
 506LogLuvEncode32(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 (1);
 589}
 590
 591/*
 592 * Encode a strip of pixels.  We break it into rows to
 593 * avoid encoding runs across row boundaries.
 594 */
 595static int
 596LogLuvEncodeStrip(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) == 1)
 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 */
 610static int
 611LogLuvEncodeTile(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) == 1)
 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
 647static
 648#endif
 649double
 650LogL16toY(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
 662static
 663#endif
 664int
 665LogL16fromY(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
 678static void
 679L16toY(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
 688static void
 689L16toGry(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
 700static void
 701L16fromY(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
 711static
 712#endif
 713void
 714XYZtoRGB24(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
 729static
 730#endif
 731double
 732LogL10toY(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
 740static
 741#endif
 742int
 743LogL10fromY(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
 757static int
 758oog_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
 811static
 812#endif
 813int
 814uv_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
 833static
 834#endif
 835int
 836uv_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
 865static
 866#endif
 867void
 868LogLuv24toXYZ(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
 893static
 894#endif
 895uint32
 896LogLuv24fromXYZ(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 */
 913		Ce = uv_encode(U_NEU, V_NEU, SGILOGENCODE_NODITHER);
 914					/* combine encodings */
 915	return (Le << 14 | Ce);
 916}
 917
 918static void
 919Luv24toXYZ(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
 931static void
 932Luv24toLuv48(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
 951static void
 952Luv24toRGB(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
 966static void
 967Luv24fromXYZ(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
 978static void
 979Luv24fromLuv48(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 */
 999			Ce = uv_encode(U_NEU, V_NEU, SGILOGENCODE_NODITHER);
1000		*luv++ = (uint32)Le << 14 | Ce;
1001		luv3 += 3;
1002	}
1003}
1004
1005#if !LOGLUV_PUBLIC
1006static
1007#endif
1008void
1009LogLuv32toXYZ(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
1031static
1032#endif
1033uint32
1034LogLuv32fromXYZ(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
1059static void
1060Luv32toXYZ(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
1071static void
1072Luv32toLuv48(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
1089static void
1090Luv32toRGB(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
1104static void
1105Luv32fromXYZ(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
1116static void
1117Luv32fromLuv48(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
1139static void
1140_logLuvNop(LogLuvState* sp, tidata_t op, int n)
1141{
1142	(void) sp; (void) op; (void) n;
1143}
1144
1145static int
1146LogL16GuessDataFmt(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
1164static uint32
1165multiply(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
1175static int
1176LogL16InitState(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:
1199		TIFFErrorExt(tif->tif_clientdata, tif->tif_name,
1200		    "No support for converting user data format to LogL");
1201		return (0);
1202	}
1203        if( isTiled(tif) )
1204            sp->tbuflen = multiply(td->td_tilewidth, td->td_tilelength);
1205        else
1206            sp->tbuflen = multiply(td->td_imagewidth, td->td_rowsperstrip);
1207	if (multiply(sp->tbuflen, sizeof (int16)) == 0 ||
1208	    (sp->tbuf = (tidata_t*) _TIFFmalloc(sp->tbuflen * sizeof (int16))) == NULL) {
1209		TIFFErrorExt(tif->tif_clientdata, module, "%s: No space for SGILog translation buffer",
1210		    tif->tif_name);
1211		return (0);
1212	}
1213	return (1);
1214}
1215
1216static int
1217LogLuvGuessDataFmt(TIFFDirectory *td)
1218{
1219	int guess;
1220
1221	/*
1222	 * If the user didn't tell us their datafmt,
1223	 * take our best guess from the bitspersample.
1224	 */
1225#define	PACK(a,b)	(((a)<<3)|(b))
1226	switch (PACK(td->td_bitspersample, td->td_sampleformat)) {
1227	case PACK(32, SAMPLEFORMAT_IEEEFP):
1228		guess = SGILOGDATAFMT_FLOAT;
1229		break;
1230	case PACK(32, SAMPLEFORMAT_VOID):
1231	case PACK(32, SAMPLEFORMAT_UINT):
1232	case PACK(32, SAMPLEFORMAT_INT):
1233		guess = SGILOGDATAFMT_RAW;
1234		break;
1235	case PACK(16, SAMPLEFORMAT_VOID):
1236	case PACK(16, SAMPLEFORMAT_INT):
1237	case PACK(16, SAMPLEFORMAT_UINT):
1238		guess = SGILOGDATAFMT_16BIT;
1239		break;
1240	case PACK( 8, SAMPLEFORMAT_VOID):
1241	case PACK( 8, SAMPLEFORMAT_UINT):
1242		guess = SGILOGDATAFMT_8BIT;
1243		break;
1244	default:
1245		guess = SGILOGDATAFMT_UNKNOWN;
1246		break;
1247#undef PACK
1248	}
1249	/*
1250	 * Double-check samples per pixel.
1251	 */
1252	switch (td->td_samplesperpixel) {
1253	case 1:
1254		if (guess != SGILOGDATAFMT_RAW)
1255			guess = SGILOGDATAFMT_UNKNOWN;
1256		break;
1257	case 3:
1258		if (guess == SGILOGDATAFMT_RAW)
1259			guess = SGILOGDATAFMT_UNKNOWN;
1260		break;
1261	default:
1262		guess = SGILOGDATAFMT_UNKNOWN;
1263		break;
1264	}
1265	return (guess);
1266}
1267
1268static int
1269LogLuvInitState(TIFF* tif)
1270{
1271	TIFFDirectory* td = &tif->tif_dir;
1272	LogLuvState* sp = DecoderState(tif);
1273	static const char module[] = "LogLuvInitState";
1274
1275	assert(sp != NULL);
1276	assert(td->td_photometric == PHOTOMETRIC_LOGLUV);
1277
1278	/* for some reason, we can't do this in TIFFInitLogLuv */
1279	if (td->td_planarconfig != PLANARCONFIG_CONTIG) {
1280		TIFFErrorExt(tif->tif_clientdata, module,
1281		    "SGILog compression cannot handle non-contiguous data");
1282		return (0);
1283	}
1284	if (sp->user_datafmt == SGILOGDATAFMT_UNKNOWN)
1285		sp->user_datafmt = LogLuvGuessDataFmt(td);
1286	switch (sp->user_datafmt) {
1287	case SGILOGDATAFMT_FLOAT:
1288		sp->pixel_size = 3*sizeof (float);
1289		break;
1290	case SGILOGDATAFMT_16BIT:
1291		sp->pixel_size = 3*sizeof (int16);
1292		break;
1293	case SGILOGDATAFMT_RAW:
1294		sp->pixel_size = sizeof (uint32);
1295		break;
1296	case SGILOGDATAFMT_8BIT:
1297		sp->pixel_size = 3*sizeof (uint8);
1298		break;
1299	default:
1300		TIFFErrorExt(tif->tif_clientdata, tif->tif_name,
1301		    "No support for converting user data format to LogLuv");
1302		return (0);
1303	}
1304        if( isTiled(tif) )
1305            sp->tbuflen = multiply(td->td_tilewidth, td->td_tilelength);
1306        else
1307            sp->tbuflen = multiply(td->td_imagewidth, td->td_rowsperstrip);
1308	if (multiply(sp->tbuflen, sizeof (uint32)) == 0 ||
1309	    (sp->tbuf = (tidata_t*) _TIFFmalloc(sp->tbuflen * sizeof (uint32))) == NULL) {
1310		TIFFErrorExt(tif->tif_clientdata, module, "%s: No space for SGILog translation buffer",
1311		    tif->tif_name);
1312		return (0);
1313	}
1314	return (1);
1315}
1316
1317static int
1318LogLuvSetupDecode(TIFF* tif)
1319{
1320	LogLuvState* sp = DecoderState(tif);
1321	TIFFDirectory* td = &tif->tif_dir;
1322
1323	tif->tif_postdecode = _TIFFNoPostDecode;
1324	switch (td->td_photometric) {
1325	case PHOTOMETRIC_LOGLUV:
1326		if (!LogLuvInitState(tif))
1327			break;
1328		if (td->td_compression == COMPRESSION_SGILOG24) {
1329			tif->tif_decoderow = LogLuvDecode24;
1330			switch (sp->user_datafmt) {
1331			case SGILOGDATAFMT_FLOAT:
1332				sp->tfunc = Luv24toXYZ;
1333				break;
1334			case SGILOGDATAFMT_16BIT:
1335				sp->tfunc = Luv24toLuv48;
1336				break;
1337			case SGILOGDATAFMT_8BIT:
1338				sp->tfunc = Luv24toRGB;
1339				break;
1340			}
1341		} else {
1342			tif->tif_decoderow = LogLuvDecode32;
1343			switch (sp->user_datafmt) {
1344			case SGILOGDATAFMT_FLOAT:
1345				sp->tfunc = Luv32toXYZ;
1346				break;
1347			case SGILOGDATAFMT_16BIT:
1348				sp->tfunc = Luv32toLuv48;
1349				break;
1350			case SGILOGDATAFMT_8BIT:
1351				sp->tfunc = Luv32toRGB;
1352				break;
1353			}
1354		}
1355		return (1);
1356	case PHOTOMETRIC_LOGL:
1357		if (!LogL16InitState(tif))
1358			break;
1359		tif->tif_decoderow = LogL16Decode;
1360		switch (sp->user_datafmt) {
1361		case SGILOGDATAFMT_FLOAT:
1362			sp->tfunc = L16toY;
1363			break;
1364		case SGILOGDATAFMT_8BIT:
1365			sp->tfunc = L16toGry;
1366			break;
1367		}
1368		return (1);
1369	default:
1370		TIFFErrorExt(tif->tif_clientdata, tif->tif_name,
1371    "Inappropriate photometric interpretation %d for SGILog compression; %s",
1372		    td->td_photometric, "must be either LogLUV or LogL");
1373		break;
1374	}
1375	return (0);
1376}
1377
1378static int
1379LogLuvSetupEncode(TIFF* tif)
1380{
1381	LogLuvState* sp = EncoderState(tif);
1382	TIFFDirectory* td = &tif->tif_dir;
1383
1384	switch (td->td_photometric) {
1385	case PHOTOMETRIC_LOGLUV:
1386		if (!LogLuvInitState(tif))
1387			break;
1388		if (td->td_compression == COMPRESSION_SGILOG24) {
1389			tif->tif_encoderow = LogLuvEncode24;
1390			switch (sp->user_datafmt) {
1391			case SGILOGDATAFMT_FLOAT:
1392				sp->tfunc = Luv24fromXYZ;
1393				break;
1394			case SGILOGDATAFMT_16BIT:
1395				sp->tfunc = Luv24fromLuv48;
1396				break;
1397			case SGILOGDATAFMT_RAW:
1398				break;
1399			default:
1400				goto notsupported;
1401			}
1402		} else {
1403			tif->tif_encoderow = LogLuvEncode32;
1404			switch (sp->user_datafmt) {
1405			case SGILOGDATAFMT_FLOAT:
1406				sp->tfunc = Luv32fromXYZ;
1407				break;
1408			case SGILOGDATAFMT_16BIT:
1409				sp->tfunc = Luv32fromLuv48;
1410				break;
1411			case SGILOGDATAFMT_RAW:
1412				break;
1413			default:
1414				goto notsupported;
1415			}
1416		}
1417		break;
1418	case PHOTOMETRIC_LOGL:
1419		if (!LogL16InitState(tif))
1420			break;
1421		tif->tif_encoderow = LogL16Encode;
1422		switch (sp->user_datafmt) {
1423		case SGILOGDATAFMT_FLOAT:
1424			sp->tfunc = L16fromY;
1425			break;
1426		case SGILOGDATAFMT_16BIT:
1427			break;
1428		default:
1429			goto notsupported;
1430		}
1431		break;
1432	default:
1433		TIFFErrorExt(tif->tif_clientdata, tif->tif_name,
1434    "Inappropriate photometric interpretation %d for SGILog compression; %s",
1435    		    td->td_photometric, "must be either LogLUV or LogL");
1436		break;
1437	}
1438	return (1);
1439notsupported:
1440	TIFFErrorExt(tif->tif_clientdata, tif->tif_name,
1441	    "SGILog compression supported only for %s, or raw data",
1442	    td->td_photometric == PHOTOMETRIC_LOGL ? "Y, L" : "XYZ, Luv");
1443	return (0);
1444}
1445
1446static void
1447LogLuvClose(TIFF* tif)
1448{
1449	TIFFDirectory *td = &tif->tif_dir;
1450
1451	/*
1452	 * For consistency, we always want to write out the same
1453	 * bitspersample and sampleformat for our TIFF file,
1454	 * regardless of the data format being used by the application.
1455	 * Since this routine is called after tags have been set but
1456	 * before they have been recorded in the file, we reset them here.
1457	 */
1458	td->td_samplesperpixel =
1459	    (td->td_photometric == PHOTOMETRIC_LOGL) ? 1 : 3;
1460	td->td_bitspersample = 16;
1461	td->td_sampleformat = SAMPLEFORMAT_INT;
1462}
1463
1464static void
1465LogLuvCleanup(TIFF* tif)
1466{
1467	LogLuvState* sp = (LogLuvState *)tif->tif_data;
1468
1469	assert(sp != 0);
1470
1471	tif->tif_tagmethods.vgetfield = sp->vgetparent;
1472	tif->tif_tagmethods.vsetfield = sp->vsetparent;
1473
1474	if (sp->tbuf)
1475		_TIFFfree(sp->tbuf);
1476	_TIFFfree(sp);
1477	tif->tif_data = NULL;
1478
1479	_TIFFSetDefaultCompressionState(tif);
1480}
1481
1482static int
1483LogLuvVSetField(TIFF* tif, ttag_t tag, va_list ap)
1484{
1485	LogLuvState* sp = DecoderState(tif);
1486	int bps, fmt;
1487
1488	switch (tag) {
1489	case TIFFTAG_SGILOGDATAFMT:
1490		sp->user_datafmt = va_arg(ap, int);
1491		/*
1492		 * Tweak the TIFF header so that the rest of libtiff knows what
1493		 * size of data will be passed between app and library, and
1494		 * assume that the app knows what it is doing and is not
1495		 * confused by these header manipulations...
1496		 */
1497		switch (sp->user_datafmt) {
1498		case SGILOGDATAFMT_FLOAT:
1499			bps = 32, fmt = SAMPLEFORMAT_IEEEFP;
1500			break;
1501		case SGILOGDATAFMT_16BIT:
1502			bps = 16, fmt = SAMPLEFORMAT_INT;
1503			break;
1504		case SGILOGDATAFMT_RAW:
1505			bps = 32, fmt = SAMPLEFORMAT_UINT;
1506			TIFFSetField(tif, TIFFTAG_SAMPLESPERPIXEL, 1);
1507			break;
1508		case SGILOGDATAFMT_8BIT:
1509			bps = 8, fmt = SAMPLEFORMAT_UINT;
1510			break;
1511		default:
1512			TIFFErrorExt(tif->tif_clientdata, tif->tif_name,
1513			    "Unknown data format %d for LogLuv compression",
1514			    sp->user_datafmt);
1515			return (0);
1516		}
1517		TIFFSetField(tif, TIFFTAG_BITSPERSAMPLE, bps);
1518		TIFFSetField(tif, TIFFTAG_SAMPLEFORMAT, fmt);
1519		/*
1520		 * Must recalculate sizes should bits/sample change.
1521		 */
1522		tif->tif_tilesize = isTiled(tif) ? TIFFTileSize(tif) : (tsize_t) -1;
1523		tif->tif_scanlinesize = TIFFScanlineSize(tif);
1524		return (1);
1525	case TIFFTAG_SGILOGENCODE:
1526		sp->encode_meth = va_arg(ap, int);
1527		if (sp->encode_meth != SGILOGENCODE_NODITHER &&
1528				sp->encode_meth != SGILOGENCODE_RANDITHER) {
1529			TIFFErrorExt(tif->tif_clientdata, tif->tif_name,
1530				"Unknown encoding %d for LogLuv compression",
1531				sp->encode_meth);
1532			return (0);
1533		}
1534		return (1);
1535	default:
1536		return (*sp->vsetparent)(tif, tag, ap);
1537	}
1538}
1539
1540static int
1541LogLuvVGetField(TIFF* tif, ttag_t tag, va_list ap)
1542{
1543	LogLuvState *sp = (LogLuvState *)tif->tif_data;
1544
1545	switch (tag) {
1546	case TIFFTAG_SGILOGDATAFMT:
1547		*va_arg(ap, int*) = sp->user_datafmt;
1548		return (1);
1549	default:
1550		return (*sp->vgetparent)(tif, tag, ap);
1551	}
1552}
1553
1554static const TIFFFieldInfo LogLuvFieldInfo[] = {
1555    { TIFFTAG_SGILOGDATAFMT,	  0, 0,	TIFF_SHORT,	FIELD_PSEUDO,
1556      TRUE,	FALSE,	"SGILogDataFmt"},
1557    { TIFFTAG_SGILOGENCODE,	  0, 0, TIFF_SHORT,	FIELD_PSEUDO,
1558      TRUE,	FALSE,	"SGILogEncode"}
1559};
1560
1561int
1562TIFFInitSGILog(TIFF* tif, int scheme)
1563{
1564	static const char module[] = "TIFFInitSGILog";
1565	LogLuvState* sp;
1566
1567	assert(scheme == COMPRESSION_SGILOG24 || scheme == COMPRESSION_SGILOG);
1568
1569	/*
1570	 * Merge codec-specific tag information.
1571	 */
1572	if (!_TIFFMergeFieldInfo(tif, LogLuvFieldInfo,
1573				 TIFFArrayCount(LogLuvFieldInfo))) {
1574		TIFFErrorExt(tif->tif_clientdata, module,
1575			     "Merging SGILog codec-specific tags failed");
1576		return 0;
1577	}
1578
1579	/*
1580	 * Allocate state block so tag methods have storage to record values.
1581	 */
1582	tif->tif_data = (tidata_t) _TIFFmalloc(sizeof (LogLuvState));
1583	if (tif->tif_data == NULL)
1584		goto bad;
1585	sp = (LogLuvState*) tif->tif_data;
1586	_TIFFmemset((tdata_t)sp, 0, sizeof (*sp));
1587	sp->user_datafmt = SGILOGDATAFMT_UNKNOWN;
1588	sp->encode_meth = (scheme == COMPRESSION_SGILOG24) ?
1589				SGILOGENCODE_RANDITHER : SGILOGENCODE_NODITHER;
1590	sp->tfunc = _logLuvNop;
1591
1592	/*
1593	 * Install codec methods.
1594	 * NB: tif_decoderow & tif_encoderow are filled
1595	 *     in at setup time.
1596	 */
1597	tif->tif_setupdecode = LogLuvSetupDecode;
1598	tif->tif_decodestrip = LogLuvDecodeStrip;
1599	tif->tif_decodetile = LogLuvDecodeTile;
1600	tif->tif_setupencode = LogLuvSetupEncode;
1601	tif->tif_encodestrip = LogLuvEncodeStrip;
1602	tif->tif_encodetile = LogLuvEncodeTile;
1603	tif->tif_close = LogLuvClose;
1604	tif->tif_cleanup = LogLuvCleanup;
1605
1606	/* 
1607	 * Override parent get/set field methods.
1608	 */
1609	sp->vgetparent = tif->tif_tagmethods.vgetfield;
1610	tif->tif_tagmethods.vgetfield = LogLuvVGetField;   /* hook for codec tags */
1611	sp->vsetparent = tif->tif_tagmethods.vsetfield;
1612	tif->tif_tagmethods.vsetfield = LogLuvVSetField;   /* hook for codec tags */
1613
1614	return (1);
1615bad:
1616	TIFFErrorExt(tif->tif_clientdata, module,
1617		     "%s: No space for LogLuv state block", tif->tif_name);
1618	return (0);
1619}
1620#endif /* LOGLUV_SUPPORT */
1621
1622/* vim: set ts=8 sts=8 sw=8 noet: */
1623/*
1624 * Local Variables:
1625 * mode: c
1626 * c-basic-offset: 8
1627 * fill-column: 78
1628 * End:
1629 */