--- /dev/null
+/* $Id: tif_luv.c,v 1.1 2005-06-17 13:54:52 vp153 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 N(a) (sizeof(a)/sizeof(a[0]))
+#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) {
+ TIFFError(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) {
+ TIFFError(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) {
+ TIFFError(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:
+ TIFFError(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) {
+ TIFFError(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) {
+ TIFFError(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:
+ TIFFError(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) {
+ TIFFError(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:
+ TIFFError(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:
+ TIFFError(tif->tif_name,
+ "Inappropriate photometric interpretation %d for SGILog compression; %s",
+ td->td_photometric, "must be either LogLUV or LogL");
+ break;
+ }
+ return (1);
+notsupported:
+ TIFFError(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;
+
+ if (sp) {
+ if (sp->tbuf)
+ _TIFFfree(sp->tbuf);
+ _TIFFfree(sp);
+ tif->tif_data = NULL;
+ }
+}
+
+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:
+ TIFFError(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) {
+ TIFFError(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, N(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:
+ TIFFError(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: */
projects / opencv / blobdiff