First commit - moving from LuaForge to SourceForge

1 files changed, 1606 insertions, 0 deletions

diff --git a/src/libtiff/tif_luv.c b/src/libtiff/tif_luv.c
new file mode 100644
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+++ b/src/libtiff/tif_luv.c
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+/* $Id: tif_luv.c,v 1.1 2008/10/17 06:16:07 scuri Exp $ */
+
+/*
+ * Copyright (c) 1997 Greg Ward Larson
+ * Copyright (c) 1997 Silicon Graphics, Inc.
+ *
+ * Permission to use, copy, modify, distribute, and sell this software and 
+ * its documentation for any purpose is hereby granted without fee, provided
+ * that (i) the above copyright notices and this permission notice appear in
+ * all copies of the software and related documentation, and (ii) the names of
+ * Sam Leffler, Greg Larson and Silicon Graphics may not be used in any
+ * advertising or publicity relating to the software without the specific,
+ * prior written permission of Sam Leffler, Greg Larson and Silicon Graphics.
+ * 
+ * THE SOFTWARE IS PROVIDED "AS-IS" AND WITHOUT WARRANTY OF ANY KIND, 
+ * EXPRESS, IMPLIED OR OTHERWISE, INCLUDING WITHOUT LIMITATION, ANY 
+ * WARRANTY OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE.  
+ * 
+ * IN NO EVENT SHALL SAM LEFFLER, GREG LARSON OR SILICON GRAPHICS BE LIABLE
+ * FOR ANY SPECIAL, INCIDENTAL, INDIRECT OR CONSEQUENTIAL DAMAGES OF ANY KIND,
+ * OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
+ * WHETHER OR NOT ADVISED OF THE POSSIBILITY OF DAMAGE, AND ON ANY THEORY OF 
+ * LIABILITY, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE 
+ * OF THIS SOFTWARE.
+ */
+
+#include "tiffiop.h"
+#ifdef LOGLUV_SUPPORT
+
+/*
+ * TIFF Library.
+ * LogLuv compression support for high dynamic range images.
+ *
+ * Contributed by Greg Larson.
+ *
+ * LogLuv image support uses the TIFF library to store 16 or 10-bit
+ * log luminance values with 8 bits each of u and v or a 14-bit index.
+ *
+ * The codec can take as input and produce as output 32-bit IEEE float values 
+ * as well as 16-bit integer values.  A 16-bit luminance is interpreted
+ * as a sign bit followed by a 15-bit integer that is converted
+ * to and from a linear magnitude using the transformation:
+ *
+ *	L = 2^( (Le+.5)/256 - 64 )		# real from 15-bit
+ *
+ *	Le = floor( 256*(log2(L) + 64) )	# 15-bit from real
+ *
+ * The actual conversion to world luminance units in candelas per sq. meter
+ * requires an additional multiplier, which is stored in the TIFFTAG_STONITS.
+ * This value is usually set such that a reasonable exposure comes from
+ * clamping decoded luminances above 1 to 1 in the displayed image.
+ *
+ * The 16-bit values for u and v may be converted to real values by dividing
+ * each by 32768.  (This allows for negative values, which aren't useful as
+ * far as we know, but are left in case of future improvements in human
+ * color vision.)
+ *
+ * Conversion from (u,v), which is actually the CIE (u',v') system for
+ * you color scientists, is accomplished by the following transformation:
+ *
+ *	u = 4*x / (-2*x + 12*y + 3)
+ *	v = 9*y / (-2*x + 12*y + 3)
+ *
+ *	x = 9*u / (6*u - 16*v + 12)
+ *	y = 4*v / (6*u - 16*v + 12)
+ *
+ * This process is greatly simplified by passing 32-bit IEEE floats
+ * for each of three CIE XYZ coordinates.  The codec then takes care
+ * of conversion to and from LogLuv, though the application is still
+ * responsible for interpreting the TIFFTAG_STONITS calibration factor.
+ *
+ * By definition, a CIE XYZ vector of [1 1 1] corresponds to a neutral white
+ * point of (x,y)=(1/3,1/3).  However, most color systems assume some other
+ * white point, such as D65, and an absolute color conversion to XYZ then
+ * to another color space with a different white point may introduce an
+ * unwanted color cast to the image.  It is often desirable, therefore, to
+ * perform a white point conversion that maps the input white to [1 1 1]
+ * in XYZ, then record the original white point using the TIFFTAG_WHITEPOINT
+ * tag value.  A decoder that demands absolute color calibration may use
+ * this white point tag to get back the original colors, but usually it
+ * will be ignored and the new white point will be used instead that
+ * matches the output color space.
+ *
+ * Pixel information is compressed into one of two basic encodings, depending
+ * on the setting of the compression tag, which is one of COMPRESSION_SGILOG
+ * or COMPRESSION_SGILOG24.  For COMPRESSION_SGILOG, greyscale data is
+ * stored as:
+ *
+ *	 1       15
+ *	|-+---------------|
+ *
+ * COMPRESSION_SGILOG color data is stored as:
+ *
+ *	 1       15           8        8
+ *	|-+---------------|--------+--------|
+ *	 S       Le           ue       ve
+ *
+ * For the 24-bit COMPRESSION_SGILOG24 color format, the data is stored as:
+ *
+ *	     10           14
+ *	|----------|--------------|
+ *	     Le'          Ce
+ *
+ * There is no sign bit in the 24-bit case, and the (u,v) chromaticity is
+ * encoded as an index for optimal color resolution.  The 10 log bits are
+ * defined by the following conversions:
+ *
+ *	L = 2^((Le'+.5)/64 - 12)		# real from 10-bit
+ *
+ *	Le' = floor( 64*(log2(L) + 12) )	# 10-bit from real
+ *
+ * The 10 bits of the smaller format may be converted into the 15 bits of
+ * the larger format by multiplying by 4 and adding 13314.  Obviously,
+ * a smaller range of magnitudes is covered (about 5 orders of magnitude
+ * instead of 38), and the lack of a sign bit means that negative luminances
+ * are not allowed.  (Well, they aren't allowed in the real world, either,
+ * but they are useful for certain types of image processing.)
+ *
+ * The desired user format is controlled by the setting the internal
+ * pseudo tag TIFFTAG_SGILOGDATAFMT to one of:
+ *  SGILOGDATAFMT_FLOAT       = IEEE 32-bit float XYZ values
+ *  SGILOGDATAFMT_16BIT	      = 16-bit integer encodings of logL, u and v
+ * Raw data i/o is also possible using:
+ *  SGILOGDATAFMT_RAW         = 32-bit unsigned integer with encoded pixel
+ * In addition, the following decoding is provided for ease of display:
+ *  SGILOGDATAFMT_8BIT        = 8-bit default RGB gamma-corrected values
+ *
+ * For grayscale images, we provide the following data formats:
+ *  SGILOGDATAFMT_FLOAT       = IEEE 32-bit float Y values
+ *  SGILOGDATAFMT_16BIT       = 16-bit integer w/ encoded luminance
+ *  SGILOGDATAFMT_8BIT        = 8-bit gray monitor values
+ *
+ * Note that the COMPRESSION_SGILOG applies a simple run-length encoding
+ * scheme by separating the logL, u and v bytes for each row and applying
+ * a PackBits type of compression.  Since the 24-bit encoding is not
+ * adaptive, the 32-bit color format takes less space in many cases.
+ *
+ * Further control is provided over the conversion from higher-resolution
+ * formats to final encoded values through the pseudo tag
+ * TIFFTAG_SGILOGENCODE:
+ *  SGILOGENCODE_NODITHER     = do not dither encoded values
+ *  SGILOGENCODE_RANDITHER    = apply random dithering during encoding
+ *
+ * The default value of this tag is SGILOGENCODE_NODITHER for
+ * COMPRESSION_SGILOG to maximize run-length encoding and
+ * SGILOGENCODE_RANDITHER for COMPRESSION_SGILOG24 to turn
+ * quantization errors into noise.
+ */
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <math.h>
+
+/*
+ * State block for each open TIFF
+ * file using LogLuv compression/decompression.
+ */
+typedef	struct logLuvState LogLuvState;
+
+struct logLuvState {
+	int			user_datafmt;	/* user data format */
+	int			encode_meth;	/* encoding method */
+	int			pixel_size;	/* bytes per pixel */
+
+	tidata_t*		tbuf;		/* translation buffer */
+	int			tbuflen;	/* buffer length */
+	void (*tfunc)(LogLuvState*, tidata_t, int);
+
+	TIFFVSetMethod		vgetparent;	/* super-class method */
+	TIFFVSetMethod		vsetparent;	/* super-class method */
+};
+
+#define	DecoderState(tif)	((LogLuvState*) (tif)->tif_data)
+#define	EncoderState(tif)	((LogLuvState*) (tif)->tif_data)
+
+#define SGILOGDATAFMT_UNKNOWN	-1
+
+#define MINRUN		4	/* minimum run length */
+
+/*
+ * Decode a string of 16-bit gray pixels.
+ */
+static int
+LogL16Decode(TIFF* tif, tidata_t op, tsize_t occ, tsample_t s)
+{
+	LogLuvState* sp = DecoderState(tif);
+	int shft, i, npixels;
+	unsigned char* bp;
+	int16* tp;
+	int16 b;
+	int cc, rc;
+
+	assert(s == 0);
+	assert(sp != NULL);
+
+	npixels = occ / sp->pixel_size;
+
+	if (sp->user_datafmt == SGILOGDATAFMT_16BIT)
+		tp = (int16*) op;
+	else {
+		assert(sp->tbuflen >= npixels);
+		tp = (int16*) sp->tbuf;
+	}
+	_TIFFmemset((tdata_t) tp, 0, npixels*sizeof (tp[0]));
+
+	bp = (unsigned char*) tif->tif_rawcp;
+	cc = tif->tif_rawcc;
+					/* get each byte string */
+	for (shft = 2*8; (shft -= 8) >= 0; ) {
+		for (i = 0; i < npixels && cc > 0; )
+			if (*bp >= 128) {		/* run */
+				rc = *bp++ + (2-128);
+				b = (int16)(*bp++ << shft);
+				cc -= 2;
+				while (rc-- && i < npixels)
+					tp[i++] |= b;
+			} else {			/* non-run */
+				rc = *bp++;		/* nul is noop */
+				while (--cc && rc-- && i < npixels)
+					tp[i++] |= (int16)*bp++ << shft;
+			}
+		if (i != npixels) {
+			TIFFErrorExt(tif->tif_clientdata, tif->tif_name,
+		"LogL16Decode: Not enough data at row %d (short %d pixels)",
+			    tif->tif_row, npixels - i);
+			tif->tif_rawcp = (tidata_t) bp;
+			tif->tif_rawcc = cc;
+			return (0);
+		}
+	}
+	(*sp->tfunc)(sp, op, npixels);
+	tif->tif_rawcp = (tidata_t) bp;
+	tif->tif_rawcc = cc;
+	return (1);
+}
+
+/*
+ * Decode a string of 24-bit pixels.
+ */
+static int
+LogLuvDecode24(TIFF* tif, tidata_t op, tsize_t occ, tsample_t s)
+{
+	LogLuvState* sp = DecoderState(tif);
+	int cc, i, npixels;
+	unsigned char* bp;
+	uint32* tp;
+
+	assert(s == 0);
+	assert(sp != NULL);
+
+	npixels = occ / sp->pixel_size;
+
+	if (sp->user_datafmt == SGILOGDATAFMT_RAW)
+		tp = (uint32 *)op;
+	else {
+		assert(sp->tbuflen >= npixels);
+		tp = (uint32 *) sp->tbuf;
+	}
+					/* copy to array of uint32 */
+	bp = (unsigned char*) tif->tif_rawcp;
+	cc = tif->tif_rawcc;
+	for (i = 0; i < npixels && cc > 0; i++) {
+		tp[i] = bp[0] << 16 | bp[1] << 8 | bp[2];
+		bp += 3;
+		cc -= 3;
+	}
+	tif->tif_rawcp = (tidata_t) bp;
+	tif->tif_rawcc = cc;
+	if (i != npixels) {
+		TIFFErrorExt(tif->tif_clientdata, tif->tif_name,
+	    "LogLuvDecode24: Not enough data at row %d (short %d pixels)",
+		    tif->tif_row, npixels - i);
+		return (0);
+	}
+	(*sp->tfunc)(sp, op, npixels);
+	return (1);
+}
+
+/*
+ * Decode a string of 32-bit pixels.
+ */
+static int
+LogLuvDecode32(TIFF* tif, tidata_t op, tsize_t occ, tsample_t s)
+{
+	LogLuvState* sp;
+	int shft, i, npixels;
+	unsigned char* bp;
+	uint32* tp;
+	uint32 b;
+	int cc, rc;
+
+	assert(s == 0);
+	sp = DecoderState(tif);
+	assert(sp != NULL);
+
+	npixels = occ / sp->pixel_size;
+
+	if (sp->user_datafmt == SGILOGDATAFMT_RAW)
+		tp = (uint32*) op;
+	else {
+		assert(sp->tbuflen >= npixels);
+		tp = (uint32*) sp->tbuf;
+	}
+	_TIFFmemset((tdata_t) tp, 0, npixels*sizeof (tp[0]));
+
+	bp = (unsigned char*) tif->tif_rawcp;
+	cc = tif->tif_rawcc;
+					/* get each byte string */
+	for (shft = 4*8; (shft -= 8) >= 0; ) {
+		for (i = 0; i < npixels && cc > 0; )
+			if (*bp >= 128) {		/* run */
+				rc = *bp++ + (2-128);
+				b = (uint32)*bp++ << shft;
+				cc -= 2;
+				while (rc-- && i < npixels)
+					tp[i++] |= b;
+			} else {			/* non-run */
+				rc = *bp++;		/* nul is noop */
+				while (--cc && rc-- && i < npixels)
+					tp[i++] |= (uint32)*bp++ << shft;
+			}
+		if (i != npixels) {
+			TIFFErrorExt(tif->tif_clientdata, tif->tif_name,
+		"LogLuvDecode32: Not enough data at row %d (short %d pixels)",
+			    tif->tif_row, npixels - i);
+			tif->tif_rawcp = (tidata_t) bp;
+			tif->tif_rawcc = cc;
+			return (0);
+		}
+	}
+	(*sp->tfunc)(sp, op, npixels);
+	tif->tif_rawcp = (tidata_t) bp;
+	tif->tif_rawcc = cc;
+	return (1);
+}
+
+/*
+ * Decode a strip of pixels.  We break it into rows to
+ * maintain synchrony with the encode algorithm, which
+ * is row by row.
+ */
+static int
+LogLuvDecodeStrip(TIFF* tif, tidata_t bp, tsize_t cc, tsample_t s)
+{
+	tsize_t rowlen = TIFFScanlineSize(tif);
+
+	assert(cc%rowlen == 0);
+	while (cc && (*tif->tif_decoderow)(tif, bp, rowlen, s))
+		bp += rowlen, cc -= rowlen;
+	return (cc == 0);
+}
+
+/*
+ * Decode a tile of pixels.  We break it into rows to
+ * maintain synchrony with the encode algorithm, which
+ * is row by row.
+ */
+static int
+LogLuvDecodeTile(TIFF* tif, tidata_t bp, tsize_t cc, tsample_t s)
+{
+	tsize_t rowlen = TIFFTileRowSize(tif);
+
+	assert(cc%rowlen == 0);
+	while (cc && (*tif->tif_decoderow)(tif, bp, rowlen, s))
+		bp += rowlen, cc -= rowlen;
+	return (cc == 0);
+}
+
+/*
+ * Encode a row of 16-bit pixels.
+ */
+static int
+LogL16Encode(TIFF* tif, tidata_t bp, tsize_t cc, tsample_t s)
+{
+	LogLuvState* sp = EncoderState(tif);
+	int shft, i, j, npixels;
+	tidata_t op;
+	int16* tp;
+	int16 b;
+	int occ, rc=0, mask, beg;
+
+	assert(s == 0);
+	assert(sp != NULL);
+	npixels = cc / sp->pixel_size;
+
+	if (sp->user_datafmt == SGILOGDATAFMT_16BIT)
+		tp = (int16*) bp;
+	else {
+		tp = (int16*) sp->tbuf;
+		assert(sp->tbuflen >= npixels);
+		(*sp->tfunc)(sp, bp, npixels);
+	}
+					/* compress each byte string */
+	op = tif->tif_rawcp;
+	occ = tif->tif_rawdatasize - tif->tif_rawcc;
+	for (shft = 2*8; (shft -= 8) >= 0; )
+		for (i = 0; i < npixels; i += rc) {
+			if (occ < 4) {
+				tif->tif_rawcp = op;
+				tif->tif_rawcc = tif->tif_rawdatasize - occ;
+				if (!TIFFFlushData1(tif))
+					return (-1);
+				op = tif->tif_rawcp;
+				occ = tif->tif_rawdatasize - tif->tif_rawcc;
+			}
+			mask = 0xff << shft;		/* find next run */
+			for (beg = i; beg < npixels; beg += rc) {
+				b = (int16) (tp[beg] & mask);
+				rc = 1;
+				while (rc < 127+2 && beg+rc < npixels &&
+						(tp[beg+rc] & mask) == b)
+					rc++;
+				if (rc >= MINRUN)
+					break;		/* long enough */
+			}
+			if (beg-i > 1 && beg-i < MINRUN) {
+				b = (int16) (tp[i] & mask);/*check short run */
+				j = i+1;
+				while ((tp[j++] & mask) == b)
+                                    if (j == beg) {
+                                        *op++ = (tidataval_t)(128-2+j-i);
+                                        *op++ = (tidataval_t) (b >> shft);
+                                        occ -= 2;
+                                        i = beg;
+                                        break;
+                                    }
+			}
+			while (i < beg) {		/* write out non-run */
+				if ((j = beg-i) > 127) j = 127;
+				if (occ < j+3) {
+                                    tif->tif_rawcp = op;
+                                    tif->tif_rawcc = tif->tif_rawdatasize - occ;
+                                    if (!TIFFFlushData1(tif))
+                                        return (-1);
+                                    op = tif->tif_rawcp;
+                                    occ = tif->tif_rawdatasize - tif->tif_rawcc;
+				}
+				*op++ = (tidataval_t) j; occ--;
+				while (j--) {
+					*op++ = (tidataval_t) (tp[i++] >> shft & 0xff);
+					occ--;
+				}
+			}
+			if (rc >= MINRUN) {		/* write out run */
+				*op++ = (tidataval_t) (128-2+rc);
+				*op++ = (tidataval_t) (tp[beg] >> shft & 0xff);
+				occ -= 2;
+			} else
+				rc = 0;
+		}
+	tif->tif_rawcp = op;
+	tif->tif_rawcc = tif->tif_rawdatasize - occ;
+
+	return (0);
+}
+
+/*
+ * Encode a row of 24-bit pixels.
+ */
+static int
+LogLuvEncode24(TIFF* tif, tidata_t bp, tsize_t cc, tsample_t s)
+{
+	LogLuvState* sp = EncoderState(tif);
+	int i, npixels, occ;
+	tidata_t op;
+	uint32* tp;
+
+	assert(s == 0);
+	assert(sp != NULL);
+	npixels = cc / sp->pixel_size;
+
+	if (sp->user_datafmt == SGILOGDATAFMT_RAW)
+		tp = (uint32*) bp;
+	else {
+		tp = (uint32*) sp->tbuf;
+		assert(sp->tbuflen >= npixels);
+		(*sp->tfunc)(sp, bp, npixels);
+	}
+					/* write out encoded pixels */
+	op = tif->tif_rawcp;
+	occ = tif->tif_rawdatasize - tif->tif_rawcc;
+	for (i = npixels; i--; ) {
+		if (occ < 3) {
+			tif->tif_rawcp = op;
+			tif->tif_rawcc = tif->tif_rawdatasize - occ;
+			if (!TIFFFlushData1(tif))
+				return (-1);
+			op = tif->tif_rawcp;
+			occ = tif->tif_rawdatasize - tif->tif_rawcc;
+		}
+		*op++ = (tidataval_t)(*tp >> 16);
+		*op++ = (tidataval_t)(*tp >> 8 & 0xff);
+		*op++ = (tidataval_t)(*tp++ & 0xff);
+		occ -= 3;
+	}
+	tif->tif_rawcp = op;
+	tif->tif_rawcc = tif->tif_rawdatasize - occ;
+
+	return (0);
+}
+
+/*
+ * Encode a row of 32-bit pixels.
+ */
+static int
+LogLuvEncode32(TIFF* tif, tidata_t bp, tsize_t cc, tsample_t s)
+{
+	LogLuvState* sp = EncoderState(tif);
+	int shft, i, j, npixels;
+	tidata_t op;
+	uint32* tp;
+	uint32 b;
+	int occ, rc=0, mask, beg;
+
+	assert(s == 0);
+	assert(sp != NULL);
+
+	npixels = cc / sp->pixel_size;
+
+	if (sp->user_datafmt == SGILOGDATAFMT_RAW)
+		tp = (uint32*) bp;
+	else {
+		tp = (uint32*) sp->tbuf;
+		assert(sp->tbuflen >= npixels);
+		(*sp->tfunc)(sp, bp, npixels);
+	}
+					/* compress each byte string */
+	op = tif->tif_rawcp;
+	occ = tif->tif_rawdatasize - tif->tif_rawcc;
+	for (shft = 4*8; (shft -= 8) >= 0; )
+		for (i = 0; i < npixels; i += rc) {
+			if (occ < 4) {
+				tif->tif_rawcp = op;
+				tif->tif_rawcc = tif->tif_rawdatasize - occ;
+				if (!TIFFFlushData1(tif))
+					return (-1);
+				op = tif->tif_rawcp;
+				occ = tif->tif_rawdatasize - tif->tif_rawcc;
+			}
+			mask = 0xff << shft;		/* find next run */
+			for (beg = i; beg < npixels; beg += rc) {
+				b = tp[beg] & mask;
+				rc = 1;
+				while (rc < 127+2 && beg+rc < npixels &&
+						(tp[beg+rc] & mask) == b)
+					rc++;
+				if (rc >= MINRUN)
+					break;		/* long enough */
+			}
+			if (beg-i > 1 && beg-i < MINRUN) {
+				b = tp[i] & mask;	/* check short run */
+				j = i+1;
+				while ((tp[j++] & mask) == b)
+					if (j == beg) {
+						*op++ = (tidataval_t)(128-2+j-i);
+						*op++ = (tidataval_t)(b >> shft);
+						occ -= 2;
+						i = beg;
+						break;
+					}
+			}
+			while (i < beg) {		/* write out non-run */
+				if ((j = beg-i) > 127) j = 127;
+				if (occ < j+3) {
+					tif->tif_rawcp = op;
+					tif->tif_rawcc = tif->tif_rawdatasize - occ;
+					if (!TIFFFlushData1(tif))
+						return (-1);
+					op = tif->tif_rawcp;
+					occ = tif->tif_rawdatasize - tif->tif_rawcc;
+				}
+				*op++ = (tidataval_t) j; occ--;
+				while (j--) {
+					*op++ = (tidataval_t)(tp[i++] >> shft & 0xff);
+					occ--;
+				}
+			}
+			if (rc >= MINRUN) {		/* write out run */
+				*op++ = (tidataval_t) (128-2+rc);
+				*op++ = (tidataval_t)(tp[beg] >> shft & 0xff);
+				occ -= 2;
+			} else
+				rc = 0;
+		}
+	tif->tif_rawcp = op;
+	tif->tif_rawcc = tif->tif_rawdatasize - occ;
+
+	return (0);
+}
+
+/*
+ * Encode a strip of pixels.  We break it into rows to
+ * avoid encoding runs across row boundaries.
+ */
+static int
+LogLuvEncodeStrip(TIFF* tif, tidata_t bp, tsize_t cc, tsample_t s)
+{
+	tsize_t rowlen = TIFFScanlineSize(tif);
+
+	assert(cc%rowlen == 0);
+	while (cc && (*tif->tif_encoderow)(tif, bp, rowlen, s) == 0)
+		bp += rowlen, cc -= rowlen;
+	return (cc == 0);
+}
+
+/*
+ * Encode a tile of pixels.  We break it into rows to
+ * avoid encoding runs across row boundaries.
+ */
+static int
+LogLuvEncodeTile(TIFF* tif, tidata_t bp, tsize_t cc, tsample_t s)
+{
+	tsize_t rowlen = TIFFTileRowSize(tif);
+
+	assert(cc%rowlen == 0);
+	while (cc && (*tif->tif_encoderow)(tif, bp, rowlen, s) == 0)
+		bp += rowlen, cc -= rowlen;
+	return (cc == 0);
+}
+
+/*
+ * Encode/Decode functions for converting to and from user formats.
+ */
+
+#include "uvcode.h"
+
+#ifndef UVSCALE
+#define U_NEU		0.210526316
+#define V_NEU		0.473684211
+#define UVSCALE		410.
+#endif
+
+#ifndef	M_LN2
+#define M_LN2		0.69314718055994530942
+#endif
+#ifndef M_PI
+#define M_PI		3.14159265358979323846
+#endif
+#define log2(x)		((1./M_LN2)*log(x))
+#define exp2(x)		exp(M_LN2*(x))
+
+#define itrunc(x,m)	((m)==SGILOGENCODE_NODITHER ? \
+				(int)(x) : \
+				(int)((x) + rand()*(1./RAND_MAX) - .5))
+
+#if !LOGLUV_PUBLIC
+static
+#endif
+double
+LogL16toY(int p16)		/* compute luminance from 16-bit LogL */
+{
+	int	Le = p16 & 0x7fff;
+	double	Y;
+
+	if (!Le)
+		return (0.);
+	Y = exp(M_LN2/256.*(Le+.5) - M_LN2*64.);
+	return (!(p16 & 0x8000) ? Y : -Y);
+}
+
+#if !LOGLUV_PUBLIC
+static
+#endif
+int
+LogL16fromY(double Y, int em)	/* get 16-bit LogL from Y */
+{
+	if (Y >= 1.8371976e19)
+		return (0x7fff);
+	if (Y <= -1.8371976e19)
+		return (0xffff);
+	if (Y > 5.4136769e-20)
+		return itrunc(256.*(log2(Y) + 64.), em);
+	if (Y < -5.4136769e-20)
+		return (~0x7fff | itrunc(256.*(log2(-Y) + 64.), em));
+	return (0);
+}
+
+static void
+L16toY(LogLuvState* sp, tidata_t op, int n)
+{
+	int16* l16 = (int16*) sp->tbuf;
+	float* yp = (float*) op;
+
+	while (n-- > 0)
+		*yp++ = (float)LogL16toY(*l16++);
+}
+
+static void
+L16toGry(LogLuvState* sp, tidata_t op, int n)
+{
+	int16* l16 = (int16*) sp->tbuf;
+	uint8* gp = (uint8*) op;
+
+	while (n-- > 0) {
+		double Y = LogL16toY(*l16++);
+		*gp++ = (uint8) ((Y <= 0.) ? 0 : (Y >= 1.) ? 255 : (int)(256.*sqrt(Y)));
+	}
+}
+
+static void
+L16fromY(LogLuvState* sp, tidata_t op, int n)
+{
+	int16* l16 = (int16*) sp->tbuf;
+	float* yp = (float*) op;
+
+	while (n-- > 0)
+		*l16++ = (int16) (LogL16fromY(*yp++, sp->encode_meth));
+}
+
+#if !LOGLUV_PUBLIC
+static
+#endif
+void
+XYZtoRGB24(float xyz[3], uint8 rgb[3])
+{
+	double	r, g, b;
+					/* assume CCIR-709 primaries */
+	r =  2.690*xyz[0] + -1.276*xyz[1] + -0.414*xyz[2];
+	g = -1.022*xyz[0] +  1.978*xyz[1] +  0.044*xyz[2];
+	b =  0.061*xyz[0] + -0.224*xyz[1] +  1.163*xyz[2];
+					/* assume 2.0 gamma for speed */
+	/* could use integer sqrt approx., but this is probably faster */
+	rgb[0] = (uint8)((r<=0.) ? 0 : (r >= 1.) ? 255 : (int)(256.*sqrt(r)));
+	rgb[1] = (uint8)((g<=0.) ? 0 : (g >= 1.) ? 255 : (int)(256.*sqrt(g)));
+	rgb[2] = (uint8)((b<=0.) ? 0 : (b >= 1.) ? 255 : (int)(256.*sqrt(b)));
+}
+
+#if !LOGLUV_PUBLIC
+static
+#endif
+double
+LogL10toY(int p10)		/* compute luminance from 10-bit LogL */
+{
+	if (p10 == 0)
+		return (0.);
+	return (exp(M_LN2/64.*(p10+.5) - M_LN2*12.));
+}
+
+#if !LOGLUV_PUBLIC
+static
+#endif
+int
+LogL10fromY(double Y, int em)	/* get 10-bit LogL from Y */
+{
+	if (Y >= 15.742)
+		return (0x3ff);
+	else if (Y <= .00024283)
+		return (0);
+	else
+		return itrunc(64.*(log2(Y) + 12.), em);
+}
+
+#define NANGLES		100
+#define uv2ang(u, v)	( (NANGLES*.499999999/M_PI) \
+				* atan2((v)-V_NEU,(u)-U_NEU) + .5*NANGLES )
+
+static int
+oog_encode(double u, double v)		/* encode out-of-gamut chroma */
+{
+	static int	oog_table[NANGLES];
+	static int	initialized = 0;
+	register int	i;
+	
+	if (!initialized) {		/* set up perimeter table */
+		double	eps[NANGLES], ua, va, ang, epsa;
+		int	ui, vi, ustep;
+		for (i = NANGLES; i--; )
+			eps[i] = 2.;
+		for (vi = UV_NVS; vi--; ) {
+			va = UV_VSTART + (vi+.5)*UV_SQSIZ;
+			ustep = uv_row[vi].nus-1;
+			if (vi == UV_NVS-1 || vi == 0 || ustep <= 0)
+				ustep = 1;
+			for (ui = uv_row[vi].nus-1; ui >= 0; ui -= ustep) {
+				ua = uv_row[vi].ustart + (ui+.5)*UV_SQSIZ;
+				ang = uv2ang(ua, va);
+                                i = (int) ang;
+				epsa = fabs(ang - (i+.5));
+				if (epsa < eps[i]) {
+					oog_table[i] = uv_row[vi].ncum + ui;
+					eps[i] = epsa;
+				}
+			}
+		}
+		for (i = NANGLES; i--; )	/* fill any holes */
+			if (eps[i] > 1.5) {
+				int	i1, i2;
+				for (i1 = 1; i1 < NANGLES/2; i1++)
+					if (eps[(i+i1)%NANGLES] < 1.5)
+						break;
+				for (i2 = 1; i2 < NANGLES/2; i2++)
+					if (eps[(i+NANGLES-i2)%NANGLES] < 1.5)
+						break;
+				if (i1 < i2)
+					oog_table[i] =
+						oog_table[(i+i1)%NANGLES];
+				else
+					oog_table[i] =
+						oog_table[(i+NANGLES-i2)%NANGLES];
+			}
+		initialized = 1;
+	}
+	i = (int) uv2ang(u, v);		/* look up hue angle */
+	return (oog_table[i]);
+}
+
+#undef uv2ang
+#undef NANGLES
+
+#if !LOGLUV_PUBLIC
+static
+#endif
+int
+uv_encode(double u, double v, int em)	/* encode (u',v') coordinates */
+{
+	register int	vi, ui;
+
+	if (v < UV_VSTART)
+		return oog_encode(u, v);
+	vi = itrunc((v - UV_VSTART)*(1./UV_SQSIZ), em);
+	if (vi >= UV_NVS)
+		return oog_encode(u, v);
+	if (u < uv_row[vi].ustart)
+		return oog_encode(u, v);
+	ui = itrunc((u - uv_row[vi].ustart)*(1./UV_SQSIZ), em);
+	if (ui >= uv_row[vi].nus)
+		return oog_encode(u, v);
+
+	return (uv_row[vi].ncum + ui);
+}
+
+#if !LOGLUV_PUBLIC
+static
+#endif
+int
+uv_decode(double *up, double *vp, int c)	/* decode (u',v') index */
+{
+	int	upper, lower;
+	register int	ui, vi;
+
+	if (c < 0 || c >= UV_NDIVS)
+		return (-1);
+	lower = 0;				/* binary search */
+	upper = UV_NVS;
+	while (upper - lower > 1) {
+		vi = (lower + upper) >> 1;
+		ui = c - uv_row[vi].ncum;
+		if (ui > 0)
+			lower = vi;
+		else if (ui < 0)
+			upper = vi;
+		else {
+			lower = vi;
+			break;
+		}
+	}
+	vi = lower;
+	ui = c - uv_row[vi].ncum;
+	*up = uv_row[vi].ustart + (ui+.5)*UV_SQSIZ;
+	*vp = UV_VSTART + (vi+.5)*UV_SQSIZ;
+	return (0);
+}
+
+#if !LOGLUV_PUBLIC
+static
+#endif
+void
+LogLuv24toXYZ(uint32 p, float XYZ[3])
+{
+	int	Ce;
+	double	L, u, v, s, x, y;
+					/* decode luminance */
+	L = LogL10toY(p>>14 & 0x3ff);
+	if (L <= 0.) {
+		XYZ[0] = XYZ[1] = XYZ[2] = 0.;
+		return;
+	}
+					/* decode color */
+	Ce = p & 0x3fff;
+	if (uv_decode(&u, &v, Ce) < 0) {
+		u = U_NEU; v = V_NEU;
+	}
+	s = 1./(6.*u - 16.*v + 12.);
+	x = 9.*u * s;
+	y = 4.*v * s;
+					/* convert to XYZ */
+	XYZ[0] = (float)(x/y * L);
+	XYZ[1] = (float)L;
+	XYZ[2] = (float)((1.-x-y)/y * L);
+}
+
+#if !LOGLUV_PUBLIC
+static
+#endif
+uint32
+LogLuv24fromXYZ(float XYZ[3], int em)
+{
+	int	Le, Ce;
+	double	u, v, s;
+					/* encode luminance */
+	Le = LogL10fromY(XYZ[1], em);
+					/* encode color */
+	s = XYZ[0] + 15.*XYZ[1] + 3.*XYZ[2];
+	if (!Le || s <= 0.) {
+		u = U_NEU;
+		v = V_NEU;
+	} else {
+		u = 4.*XYZ[0] / s;
+		v = 9.*XYZ[1] / s;
+	}
+	Ce = uv_encode(u, v, em);
+	if (Ce < 0)			/* never happens */
+		Ce = uv_encode(U_NEU, V_NEU, SGILOGENCODE_NODITHER);
+					/* combine encodings */
+	return (Le << 14 | Ce);
+}
+
+static void
+Luv24toXYZ(LogLuvState* sp, tidata_t op, int n)
+{
+	uint32* luv = (uint32*) sp->tbuf;
+	float* xyz = (float*) op;
+
+	while (n-- > 0) {
+		LogLuv24toXYZ(*luv, xyz);
+		xyz += 3;
+		luv++;
+	}
+}
+
+static void
+Luv24toLuv48(LogLuvState* sp, tidata_t op, int n)
+{
+	uint32* luv = (uint32*) sp->tbuf;
+	int16* luv3 = (int16*) op;
+
+	while (n-- > 0) {
+		double u, v;
+
+		*luv3++ = (int16)((*luv >> 12 & 0xffd) + 13314);
+		if (uv_decode(&u, &v, *luv&0x3fff) < 0) {
+			u = U_NEU;
+			v = V_NEU;
+		}
+		*luv3++ = (int16)(u * (1L<<15));
+		*luv3++ = (int16)(v * (1L<<15));
+		luv++;
+	}
+}
+
+static void
+Luv24toRGB(LogLuvState* sp, tidata_t op, int n)
+{
+	uint32* luv = (uint32*) sp->tbuf;
+	uint8* rgb = (uint8*) op;
+
+	while (n-- > 0) {
+		float xyz[3];
+
+		LogLuv24toXYZ(*luv++, xyz);
+		XYZtoRGB24(xyz, rgb);
+		rgb += 3;
+	}
+}
+
+static void
+Luv24fromXYZ(LogLuvState* sp, tidata_t op, int n)
+{
+	uint32* luv = (uint32*) sp->tbuf;
+	float* xyz = (float*) op;
+
+	while (n-- > 0) {
+		*luv++ = LogLuv24fromXYZ(xyz, sp->encode_meth);
+		xyz += 3;
+	}
+}
+
+static void
+Luv24fromLuv48(LogLuvState* sp, tidata_t op, int n)
+{
+	uint32* luv = (uint32*) sp->tbuf;
+	int16* luv3 = (int16*) op;
+
+	while (n-- > 0) {
+		int Le, Ce;
+
+		if (luv3[0] <= 0)
+			Le = 0;
+		else if (luv3[0] >= (1<<12)+3314)
+			Le = (1<<10) - 1;
+		else if (sp->encode_meth == SGILOGENCODE_NODITHER)
+			Le = (luv3[0]-3314) >> 2;
+		else
+			Le = itrunc(.25*(luv3[0]-3314.), sp->encode_meth);
+
+		Ce = uv_encode((luv3[1]+.5)/(1<<15), (luv3[2]+.5)/(1<<15),
+					sp->encode_meth);
+		if (Ce < 0)	/* never happens */
+			Ce = uv_encode(U_NEU, V_NEU, SGILOGENCODE_NODITHER);
+		*luv++ = (uint32)Le << 14 | Ce;
+		luv3 += 3;
+	}
+}
+
+#if !LOGLUV_PUBLIC
+static
+#endif
+void
+LogLuv32toXYZ(uint32 p, float XYZ[3])
+{
+	double	L, u, v, s, x, y;
+					/* decode luminance */
+	L = LogL16toY((int)p >> 16);
+	if (L <= 0.) {
+		XYZ[0] = XYZ[1] = XYZ[2] = 0.;
+		return;
+	}
+					/* decode color */
+	u = 1./UVSCALE * ((p>>8 & 0xff) + .5);
+	v = 1./UVSCALE * ((p & 0xff) + .5);
+	s = 1./(6.*u - 16.*v + 12.);
+	x = 9.*u * s;
+	y = 4.*v * s;
+					/* convert to XYZ */
+	XYZ[0] = (float)(x/y * L);
+	XYZ[1] = (float)L;
+	XYZ[2] = (float)((1.-x-y)/y * L);
+}
+
+#if !LOGLUV_PUBLIC
+static
+#endif
+uint32
+LogLuv32fromXYZ(float XYZ[3], int em)
+{
+	unsigned int	Le, ue, ve;
+	double	u, v, s;
+					/* encode luminance */
+	Le = (unsigned int)LogL16fromY(XYZ[1], em);
+					/* encode color */
+	s = XYZ[0] + 15.*XYZ[1] + 3.*XYZ[2];
+	if (!Le || s <= 0.) {
+		u = U_NEU;
+		v = V_NEU;
+	} else {
+		u = 4.*XYZ[0] / s;
+		v = 9.*XYZ[1] / s;
+	}
+	if (u <= 0.) ue = 0;
+	else ue = itrunc(UVSCALE*u, em);
+	if (ue > 255) ue = 255;
+	if (v <= 0.) ve = 0;
+	else ve = itrunc(UVSCALE*v, em);
+	if (ve > 255) ve = 255;
+					/* combine encodings */
+	return (Le << 16 | ue << 8 | ve);
+}
+
+static void
+Luv32toXYZ(LogLuvState* sp, tidata_t op, int n)
+{
+	uint32* luv = (uint32*) sp->tbuf;
+	float* xyz = (float*) op;
+
+	while (n-- > 0) {
+		LogLuv32toXYZ(*luv++, xyz);
+		xyz += 3;
+	}
+}
+
+static void
+Luv32toLuv48(LogLuvState* sp, tidata_t op, int n)
+{
+	uint32* luv = (uint32*) sp->tbuf;
+	int16* luv3 = (int16*) op;
+
+	while (n-- > 0) {
+		double u, v;
+
+		*luv3++ = (int16)(*luv >> 16);
+		u = 1./UVSCALE * ((*luv>>8 & 0xff) + .5);
+		v = 1./UVSCALE * ((*luv & 0xff) + .5);
+		*luv3++ = (int16)(u * (1L<<15));
+		*luv3++ = (int16)(v * (1L<<15));
+		luv++;
+	}
+}
+
+static void
+Luv32toRGB(LogLuvState* sp, tidata_t op, int n)
+{
+	uint32* luv = (uint32*) sp->tbuf;
+	uint8* rgb = (uint8*) op;
+
+	while (n-- > 0) {
+		float xyz[3];
+
+		LogLuv32toXYZ(*luv++, xyz);
+		XYZtoRGB24(xyz, rgb);
+		rgb += 3;
+	}
+}
+
+static void
+Luv32fromXYZ(LogLuvState* sp, tidata_t op, int n)
+{
+	uint32* luv = (uint32*) sp->tbuf;
+	float* xyz = (float*) op;
+
+	while (n-- > 0) {
+		*luv++ = LogLuv32fromXYZ(xyz, sp->encode_meth);
+		xyz += 3;
+	}
+}
+
+static void
+Luv32fromLuv48(LogLuvState* sp, tidata_t op, int n)
+{
+	uint32* luv = (uint32*) sp->tbuf;
+	int16* luv3 = (int16*) op;
+
+	if (sp->encode_meth == SGILOGENCODE_NODITHER) {
+		while (n-- > 0) {
+			*luv++ = (uint32)luv3[0] << 16 |
+				(luv3[1]*(uint32)(UVSCALE+.5) >> 7 & 0xff00) |
+				(luv3[2]*(uint32)(UVSCALE+.5) >> 15 & 0xff);
+			luv3 += 3;
+		}
+		return;
+	}
+	while (n-- > 0) {
+		*luv++ = (uint32)luv3[0] << 16 |
+	(itrunc(luv3[1]*(UVSCALE/(1<<15)), sp->encode_meth) << 8 & 0xff00) |
+		(itrunc(luv3[2]*(UVSCALE/(1<<15)), sp->encode_meth) & 0xff);
+		luv3 += 3;
+	}
+}
+
+static void
+_logLuvNop(LogLuvState* sp, tidata_t op, int n)
+{
+	(void) sp; (void) op; (void) n;
+}
+
+static int
+LogL16GuessDataFmt(TIFFDirectory *td)
+{
+#define	PACK(s,b,f)	(((b)<<6)|((s)<<3)|(f))
+	switch (PACK(td->td_samplesperpixel, td->td_bitspersample, td->td_sampleformat)) {
+	case PACK(1, 32, SAMPLEFORMAT_IEEEFP):
+		return (SGILOGDATAFMT_FLOAT);
+	case PACK(1, 16, SAMPLEFORMAT_VOID):
+	case PACK(1, 16, SAMPLEFORMAT_INT):
+	case PACK(1, 16, SAMPLEFORMAT_UINT):
+		return (SGILOGDATAFMT_16BIT);
+	case PACK(1,  8, SAMPLEFORMAT_VOID):
+	case PACK(1,  8, SAMPLEFORMAT_UINT):
+		return (SGILOGDATAFMT_8BIT);
+	}
+#undef PACK
+	return (SGILOGDATAFMT_UNKNOWN);
+}
+
+static uint32
+multiply(size_t m1, size_t m2)
+{
+	uint32	bytes = m1 * m2;
+
+	if (m1 && bytes / m1 != m2)
+		bytes = 0;
+
+	return bytes;
+}
+
+static int
+LogL16InitState(TIFF* tif)
+{
+	TIFFDirectory *td = &tif->tif_dir;
+	LogLuvState* sp = DecoderState(tif);
+	static const char module[] = "LogL16InitState";
+
+	assert(sp != NULL);
+	assert(td->td_photometric == PHOTOMETRIC_LOGL);
+
+	/* for some reason, we can't do this in TIFFInitLogL16 */
+	if (sp->user_datafmt == SGILOGDATAFMT_UNKNOWN)
+		sp->user_datafmt = LogL16GuessDataFmt(td);
+	switch (sp->user_datafmt) {
+	case SGILOGDATAFMT_FLOAT:
+		sp->pixel_size = sizeof (float);
+		break;
+	case SGILOGDATAFMT_16BIT:
+		sp->pixel_size = sizeof (int16);
+		break;
+	case SGILOGDATAFMT_8BIT:
+		sp->pixel_size = sizeof (uint8);
+		break;
+	default:
+		TIFFErrorExt(tif->tif_clientdata, tif->tif_name,
+		    "No support for converting user data format to LogL");
+		return (0);
+	}
+	sp->tbuflen = multiply(td->td_imagewidth, td->td_rowsperstrip);
+	if (multiply(sp->tbuflen, sizeof (int16)) == 0 ||
+	    (sp->tbuf = (tidata_t*) _TIFFmalloc(sp->tbuflen * sizeof (int16))) == NULL) {
+		TIFFErrorExt(tif->tif_clientdata, module, "%s: No space for SGILog translation buffer",
+		    tif->tif_name);
+		return (0);
+	}
+	return (1);
+}
+
+static int
+LogLuvGuessDataFmt(TIFFDirectory *td)
+{
+	int guess;
+
+	/*
+	 * If the user didn't tell us their datafmt,
+	 * take our best guess from the bitspersample.
+	 */
+#define	PACK(a,b)	(((a)<<3)|(b))
+	switch (PACK(td->td_bitspersample, td->td_sampleformat)) {
+	case PACK(32, SAMPLEFORMAT_IEEEFP):
+		guess = SGILOGDATAFMT_FLOAT;
+		break;
+	case PACK(32, SAMPLEFORMAT_VOID):
+	case PACK(32, SAMPLEFORMAT_UINT):
+	case PACK(32, SAMPLEFORMAT_INT):
+		guess = SGILOGDATAFMT_RAW;
+		break;
+	case PACK(16, SAMPLEFORMAT_VOID):
+	case PACK(16, SAMPLEFORMAT_INT):
+	case PACK(16, SAMPLEFORMAT_UINT):
+		guess = SGILOGDATAFMT_16BIT;
+		break;
+	case PACK( 8, SAMPLEFORMAT_VOID):
+	case PACK( 8, SAMPLEFORMAT_UINT):
+		guess = SGILOGDATAFMT_8BIT;
+		break;
+	default:
+		guess = SGILOGDATAFMT_UNKNOWN;
+		break;
+#undef PACK
+	}
+	/*
+	 * Double-check samples per pixel.
+	 */
+	switch (td->td_samplesperpixel) {
+	case 1:
+		if (guess != SGILOGDATAFMT_RAW)
+			guess = SGILOGDATAFMT_UNKNOWN;
+		break;
+	case 3:
+		if (guess == SGILOGDATAFMT_RAW)
+			guess = SGILOGDATAFMT_UNKNOWN;
+		break;
+	default:
+		guess = SGILOGDATAFMT_UNKNOWN;
+		break;
+	}
+	return (guess);
+}
+
+static int
+LogLuvInitState(TIFF* tif)
+{
+	TIFFDirectory* td = &tif->tif_dir;
+	LogLuvState* sp = DecoderState(tif);
+	static const char module[] = "LogLuvInitState";
+
+	assert(sp != NULL);
+	assert(td->td_photometric == PHOTOMETRIC_LOGLUV);
+
+	/* for some reason, we can't do this in TIFFInitLogLuv */
+	if (td->td_planarconfig != PLANARCONFIG_CONTIG) {
+		TIFFErrorExt(tif->tif_clientdata, module,
+		    "SGILog compression cannot handle non-contiguous data");
+		return (0);
+	}
+	if (sp->user_datafmt == SGILOGDATAFMT_UNKNOWN)
+		sp->user_datafmt = LogLuvGuessDataFmt(td);
+	switch (sp->user_datafmt) {
+	case SGILOGDATAFMT_FLOAT:
+		sp->pixel_size = 3*sizeof (float);
+		break;
+	case SGILOGDATAFMT_16BIT:
+		sp->pixel_size = 3*sizeof (int16);
+		break;
+	case SGILOGDATAFMT_RAW:
+		sp->pixel_size = sizeof (uint32);
+		break;
+	case SGILOGDATAFMT_8BIT:
+		sp->pixel_size = 3*sizeof (uint8);
+		break;
+	default:
+		TIFFErrorExt(tif->tif_clientdata, tif->tif_name,
+		    "No support for converting user data format to LogLuv");
+		return (0);
+	}
+	sp->tbuflen = multiply(td->td_imagewidth, td->td_rowsperstrip);
+	if (multiply(sp->tbuflen, sizeof (uint32)) == 0 ||
+	    (sp->tbuf = (tidata_t*) _TIFFmalloc(sp->tbuflen * sizeof (uint32))) == NULL) {
+		TIFFErrorExt(tif->tif_clientdata, module, "%s: No space for SGILog translation buffer",
+		    tif->tif_name);
+		return (0);
+	}
+	return (1);
+}
+
+static int
+LogLuvSetupDecode(TIFF* tif)
+{
+	LogLuvState* sp = DecoderState(tif);
+	TIFFDirectory* td = &tif->tif_dir;
+
+	tif->tif_postdecode = _TIFFNoPostDecode;
+	switch (td->td_photometric) {
+	case PHOTOMETRIC_LOGLUV:
+		if (!LogLuvInitState(tif))
+			break;
+		if (td->td_compression == COMPRESSION_SGILOG24) {
+			tif->tif_decoderow = LogLuvDecode24;
+			switch (sp->user_datafmt) {
+			case SGILOGDATAFMT_FLOAT:
+				sp->tfunc = Luv24toXYZ;
+				break;
+			case SGILOGDATAFMT_16BIT:
+				sp->tfunc = Luv24toLuv48;
+				break;
+			case SGILOGDATAFMT_8BIT:
+				sp->tfunc = Luv24toRGB;
+				break;
+			}
+		} else {
+			tif->tif_decoderow = LogLuvDecode32;
+			switch (sp->user_datafmt) {
+			case SGILOGDATAFMT_FLOAT:
+				sp->tfunc = Luv32toXYZ;
+				break;
+			case SGILOGDATAFMT_16BIT:
+				sp->tfunc = Luv32toLuv48;
+				break;
+			case SGILOGDATAFMT_8BIT:
+				sp->tfunc = Luv32toRGB;
+				break;
+			}
+		}
+		return (1);
+	case PHOTOMETRIC_LOGL:
+		if (!LogL16InitState(tif))
+			break;
+		tif->tif_decoderow = LogL16Decode;
+		switch (sp->user_datafmt) {
+		case SGILOGDATAFMT_FLOAT:
+			sp->tfunc = L16toY;
+			break;
+		case SGILOGDATAFMT_8BIT:
+			sp->tfunc = L16toGry;
+			break;
+		}
+		return (1);
+	default:
+		TIFFErrorExt(tif->tif_clientdata, tif->tif_name,
+    "Inappropriate photometric interpretation %d for SGILog compression; %s",
+		    td->td_photometric, "must be either LogLUV or LogL");
+		break;
+	}
+	return (0);
+}
+
+static int
+LogLuvSetupEncode(TIFF* tif)
+{
+	LogLuvState* sp = EncoderState(tif);
+	TIFFDirectory* td = &tif->tif_dir;
+
+	switch (td->td_photometric) {
+	case PHOTOMETRIC_LOGLUV:
+		if (!LogLuvInitState(tif))
+			break;
+		if (td->td_compression == COMPRESSION_SGILOG24) {
+			tif->tif_encoderow = LogLuvEncode24;
+			switch (sp->user_datafmt) {
+			case SGILOGDATAFMT_FLOAT:
+				sp->tfunc = Luv24fromXYZ;
+				break;
+			case SGILOGDATAFMT_16BIT:
+				sp->tfunc = Luv24fromLuv48;
+				break;
+			case SGILOGDATAFMT_RAW:
+				break;
+			default:
+				goto notsupported;
+			}
+		} else {
+			tif->tif_encoderow = LogLuvEncode32;
+			switch (sp->user_datafmt) {
+			case SGILOGDATAFMT_FLOAT:
+				sp->tfunc = Luv32fromXYZ;
+				break;
+			case SGILOGDATAFMT_16BIT:
+				sp->tfunc = Luv32fromLuv48;
+				break;
+			case SGILOGDATAFMT_RAW:
+				break;
+			default:
+				goto notsupported;
+			}
+		}
+		break;
+	case PHOTOMETRIC_LOGL:
+		if (!LogL16InitState(tif))
+			break;
+		tif->tif_encoderow = LogL16Encode;
+		switch (sp->user_datafmt) {
+		case SGILOGDATAFMT_FLOAT:
+			sp->tfunc = L16fromY;
+			break;
+		case SGILOGDATAFMT_16BIT:
+			break;
+		default:
+			goto notsupported;
+		}
+		break;
+	default:
+		TIFFErrorExt(tif->tif_clientdata, tif->tif_name,
+    "Inappropriate photometric interpretation %d for SGILog compression; %s",
+    		    td->td_photometric, "must be either LogLUV or LogL");
+		break;
+	}
+	return (1);
+notsupported:
+	TIFFErrorExt(tif->tif_clientdata, tif->tif_name,
+	    "SGILog compression supported only for %s, or raw data",
+	    td->td_photometric == PHOTOMETRIC_LOGL ? "Y, L" : "XYZ, Luv");
+	return (0);
+}
+
+static void
+LogLuvClose(TIFF* tif)
+{
+	TIFFDirectory *td = &tif->tif_dir;
+
+	/*
+	 * For consistency, we always want to write out the same
+	 * bitspersample and sampleformat for our TIFF file,
+	 * regardless of the data format being used by the application.
+	 * Since this routine is called after tags have been set but
+	 * before they have been recorded in the file, we reset them here.
+	 */
+	td->td_samplesperpixel =
+	    (td->td_photometric == PHOTOMETRIC_LOGL) ? 1 : 3;
+	td->td_bitspersample = 16;
+	td->td_sampleformat = SAMPLEFORMAT_INT;
+}
+
+static void
+LogLuvCleanup(TIFF* tif)
+{
+	LogLuvState* sp = (LogLuvState *)tif->tif_data;
+
+	assert(sp != 0);
+
+	tif->tif_tagmethods.vgetfield = sp->vgetparent;
+	tif->tif_tagmethods.vsetfield = sp->vsetparent;
+
+	if (sp->tbuf)
+		_TIFFfree(sp->tbuf);
+	_TIFFfree(sp);
+	tif->tif_data = NULL;
+
+	_TIFFSetDefaultCompressionState(tif);
+}
+
+static int
+LogLuvVSetField(TIFF* tif, ttag_t tag, va_list ap)
+{
+	LogLuvState* sp = DecoderState(tif);
+	int bps, fmt;
+
+	switch (tag) {
+	case TIFFTAG_SGILOGDATAFMT:
+		sp->user_datafmt = va_arg(ap, int);
+		/*
+		 * Tweak the TIFF header so that the rest of libtiff knows what
+		 * size of data will be passed between app and library, and
+		 * assume that the app knows what it is doing and is not
+		 * confused by these header manipulations...
+		 */
+		switch (sp->user_datafmt) {
+		case SGILOGDATAFMT_FLOAT:
+			bps = 32, fmt = SAMPLEFORMAT_IEEEFP;
+			break;
+		case SGILOGDATAFMT_16BIT:
+			bps = 16, fmt = SAMPLEFORMAT_INT;
+			break;
+		case SGILOGDATAFMT_RAW:
+			bps = 32, fmt = SAMPLEFORMAT_UINT;
+			TIFFSetField(tif, TIFFTAG_SAMPLESPERPIXEL, 1);
+			break;
+		case SGILOGDATAFMT_8BIT:
+			bps = 8, fmt = SAMPLEFORMAT_UINT;
+			break;
+		default:
+			TIFFErrorExt(tif->tif_clientdata, tif->tif_name,
+			    "Unknown data format %d for LogLuv compression",
+			    sp->user_datafmt);
+			return (0);
+		}
+		TIFFSetField(tif, TIFFTAG_BITSPERSAMPLE, bps);
+		TIFFSetField(tif, TIFFTAG_SAMPLEFORMAT, fmt);
+		/*
+		 * Must recalculate sizes should bits/sample change.
+		 */
+		tif->tif_tilesize = isTiled(tif) ? TIFFTileSize(tif) : (tsize_t) -1;
+		tif->tif_scanlinesize = TIFFScanlineSize(tif);
+		return (1);
+	case TIFFTAG_SGILOGENCODE:
+		sp->encode_meth = va_arg(ap, int);
+		if (sp->encode_meth != SGILOGENCODE_NODITHER &&
+				sp->encode_meth != SGILOGENCODE_RANDITHER) {
+			TIFFErrorExt(tif->tif_clientdata, tif->tif_name,
+				"Unknown encoding %d for LogLuv compression",
+				sp->encode_meth);
+			return (0);
+		}
+		return (1);
+	default:
+		return (*sp->vsetparent)(tif, tag, ap);
+	}
+}
+
+static int
+LogLuvVGetField(TIFF* tif, ttag_t tag, va_list ap)
+{
+	LogLuvState *sp = (LogLuvState *)tif->tif_data;
+
+	switch (tag) {
+	case TIFFTAG_SGILOGDATAFMT:
+		*va_arg(ap, int*) = sp->user_datafmt;
+		return (1);
+	default:
+		return (*sp->vgetparent)(tif, tag, ap);
+	}
+}
+
+static const TIFFFieldInfo LogLuvFieldInfo[] = {
+    { TIFFTAG_SGILOGDATAFMT,	  0, 0,	TIFF_SHORT,	FIELD_PSEUDO,
+      TRUE,	FALSE,	"SGILogDataFmt"},
+    { TIFFTAG_SGILOGENCODE,	  0, 0, TIFF_SHORT,	FIELD_PSEUDO,
+      TRUE,	FALSE,	"SGILogEncode"}
+};
+
+int
+TIFFInitSGILog(TIFF* tif, int scheme)
+{
+	static const char module[] = "TIFFInitSGILog";
+	LogLuvState* sp;
+
+	assert(scheme == COMPRESSION_SGILOG24 || scheme == COMPRESSION_SGILOG);
+
+	/*
+	 * Allocate state block so tag methods have storage to record values.
+	 */
+	tif->tif_data = (tidata_t) _TIFFmalloc(sizeof (LogLuvState));
+	if (tif->tif_data == NULL)
+		goto bad;
+	sp = (LogLuvState*) tif->tif_data;
+	_TIFFmemset((tdata_t)sp, 0, sizeof (*sp));
+	sp->user_datafmt = SGILOGDATAFMT_UNKNOWN;
+	sp->encode_meth = (scheme == COMPRESSION_SGILOG24) ?
+				SGILOGENCODE_RANDITHER : SGILOGENCODE_NODITHER;
+	sp->tfunc = _logLuvNop;
+
+	/*
+	 * Install codec methods.
+	 * NB: tif_decoderow & tif_encoderow are filled
+	 *     in at setup time.
+	 */
+	tif->tif_setupdecode = LogLuvSetupDecode;
+	tif->tif_decodestrip = LogLuvDecodeStrip;
+	tif->tif_decodetile = LogLuvDecodeTile;
+	tif->tif_setupencode = LogLuvSetupEncode;
+	tif->tif_encodestrip = LogLuvEncodeStrip;
+	tif->tif_encodetile = LogLuvEncodeTile;
+	tif->tif_close = LogLuvClose;
+	tif->tif_cleanup = LogLuvCleanup;
+
+	/* override SetField so we can handle our private pseudo-tag */
+	_TIFFMergeFieldInfo(tif, LogLuvFieldInfo,
+			    TIFFArrayCount(LogLuvFieldInfo));
+	sp->vgetparent = tif->tif_tagmethods.vgetfield;
+	tif->tif_tagmethods.vgetfield = LogLuvVGetField;   /* hook for codec tags */
+	sp->vsetparent = tif->tif_tagmethods.vsetfield;
+	tif->tif_tagmethods.vsetfield = LogLuvVSetField;   /* hook for codec tags */
+
+	return (1);
+bad:
+	TIFFErrorExt(tif->tif_clientdata, module,
+		     "%s: No space for LogLuv state block", tif->tif_name);
+	return (0);
+}
+#endif /* LOGLUV_SUPPORT */
+
+/* vim: set ts=8 sts=8 sw=8 noet: */