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/*
* 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 <math.h>
#include <stdio.h>
#include <stdlib.h>
/*
* State block for each open TIFF
* file using LogLuv compression/decompression.
*/
typedef struct logLuvState LogLuvState;
struct logLuvState
{
int encoder_state; /* 1 if encoder correctly initialized */
int user_datafmt; /* user data format */
int encode_meth; /* encoding method */
int pixel_size; /* bytes per pixel */
uint8_t *tbuf; /* translation buffer */
tmsize_t tbuflen; /* buffer length */
void (*tfunc)(LogLuvState *, uint8_t *, tmsize_t);
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, uint8_t *op, tmsize_t occ, uint16_t s)
{
static const char module[] = "LogL16Decode";
LogLuvState *sp = DecoderState(tif);
int shft;
tmsize_t i;
tmsize_t npixels;
unsigned char *bp;
int16_t *tp;
int16_t b;
tmsize_t cc;
int rc;
(void)s;
assert(s == 0);
assert(sp != NULL);
npixels = occ / sp->pixel_size;
if (sp->user_datafmt == SGILOGDATAFMT_16BIT)
tp = (int16_t *)op;
else
{
if (sp->tbuflen < npixels)
{
TIFFErrorExtR(tif, module, "Translation buffer too short");
return (0);
}
tp = (int16_t *)sp->tbuf;
}
_TIFFmemset((void *)tp, 0, npixels * sizeof(tp[0]));
bp = (unsigned char *)tif->tif_rawcp;
cc = tif->tif_rawcc;
/* get each byte string */
for (shft = 8; shft >= 0; shft -= 8)
{
for (i = 0; i < npixels && cc > 0;)
{
if (*bp >= 128)
{ /* run */
if (cc < 2)
break;
rc = *bp++ + (2 - 128);
b = (int16_t)(*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_t)*bp++ << shft;
}
}
if (i != npixels)
{
TIFFErrorExtR(tif, module,
"Not enough data at row %" PRIu32
" (short %" TIFF_SSIZE_FORMAT " pixels)",
tif->tif_row, npixels - i);
tif->tif_rawcp = (uint8_t *)bp;
tif->tif_rawcc = cc;
return (0);
}
}
(*sp->tfunc)(sp, op, npixels);
tif->tif_rawcp = (uint8_t *)bp;
tif->tif_rawcc = cc;
return (1);
}
/*
* Decode a string of 24-bit pixels.
*/
static int LogLuvDecode24(TIFF *tif, uint8_t *op, tmsize_t occ, uint16_t s)
{
static const char module[] = "LogLuvDecode24";
LogLuvState *sp = DecoderState(tif);
tmsize_t cc;
tmsize_t i;
tmsize_t npixels;
unsigned char *bp;
uint32_t *tp;
(void)s;
assert(s == 0);
assert(sp != NULL);
npixels = occ / sp->pixel_size;
if (sp->user_datafmt == SGILOGDATAFMT_RAW)
tp = (uint32_t *)op;
else
{
if (sp->tbuflen < npixels)
{
TIFFErrorExtR(tif, module, "Translation buffer too short");
return (0);
}
tp = (uint32_t *)sp->tbuf;
}
/* copy to array of uint32_t */
bp = (unsigned char *)tif->tif_rawcp;
cc = tif->tif_rawcc;
for (i = 0; i < npixels && cc >= 3; i++)
{
tp[i] = bp[0] << 16 | bp[1] << 8 | bp[2];
bp += 3;
cc -= 3;
}
tif->tif_rawcp = (uint8_t *)bp;
tif->tif_rawcc = cc;
if (i != npixels)
{
TIFFErrorExtR(tif, module,
"Not enough data at row %" PRIu32
" (short %" TIFF_SSIZE_FORMAT " 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, uint8_t *op, tmsize_t occ, uint16_t s)
{
static const char module[] = "LogLuvDecode32";
LogLuvState *sp;
int shft;
tmsize_t i;
tmsize_t npixels;
unsigned char *bp;
uint32_t *tp;
uint32_t b;
tmsize_t cc;
int rc;
(void)s;
assert(s == 0);
sp = DecoderState(tif);
assert(sp != NULL);
npixels = occ / sp->pixel_size;
if (sp->user_datafmt == SGILOGDATAFMT_RAW)
tp = (uint32_t *)op;
else
{
if (sp->tbuflen < npixels)
{
TIFFErrorExtR(tif, module, "Translation buffer too short");
return (0);
}
tp = (uint32_t *)sp->tbuf;
}
_TIFFmemset((void *)tp, 0, npixels * sizeof(tp[0]));
bp = (unsigned char *)tif->tif_rawcp;
cc = tif->tif_rawcc;
/* get each byte string */
for (shft = 24; shft >= 0; shft -= 8)
{
for (i = 0; i < npixels && cc > 0;)
{
if (*bp >= 128)
{ /* run */
if (cc < 2)
break;
rc = *bp++ + (2 - 128);
b = (uint32_t)*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_t)*bp++ << shft;
}
}
if (i != npixels)
{
TIFFErrorExtR(tif, module,
"Not enough data at row %" PRIu32
" (short %" TIFF_SSIZE_FORMAT " pixels)",
tif->tif_row, npixels - i);
tif->tif_rawcp = (uint8_t *)bp;
tif->tif_rawcc = cc;
return (0);
}
}
(*sp->tfunc)(sp, op, npixels);
tif->tif_rawcp = (uint8_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, uint8_t *bp, tmsize_t cc, uint16_t s)
{
tmsize_t rowlen = TIFFScanlineSize(tif);
if (rowlen == 0)
return 0;
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, uint8_t *bp, tmsize_t cc, uint16_t s)
{
tmsize_t rowlen = TIFFTileRowSize(tif);
if (rowlen == 0)
return 0;
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, uint8_t *bp, tmsize_t cc, uint16_t s)
{
static const char module[] = "LogL16Encode";
LogLuvState *sp = EncoderState(tif);
int shft;
tmsize_t i;
tmsize_t j;
tmsize_t npixels;
uint8_t *op;
int16_t *tp;
int16_t b;
tmsize_t occ;
int rc = 0, mask;
tmsize_t beg;
(void)s;
assert(s == 0);
assert(sp != NULL);
npixels = cc / sp->pixel_size;
if (sp->user_datafmt == SGILOGDATAFMT_16BIT)
tp = (int16_t *)bp;
else
{
tp = (int16_t *)sp->tbuf;
if (sp->tbuflen < npixels)
{
TIFFErrorExtR(tif, module, "Translation buffer too short");
return (0);
}
(*sp->tfunc)(sp, bp, npixels);
}
/* compress each byte string */
op = tif->tif_rawcp;
occ = tif->tif_rawdatasize - tif->tif_rawcc;
for (shft = 8; shft >= 0; shft -= 8)
{
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 (0);
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_t)(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_t)(tp[i] & mask); /*check short run */
j = i + 1;
while ((tp[j++] & mask) == b)
if (j == beg)
{
*op++ = (uint8_t)(128 - 2 + j - i);
*op++ = (uint8_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 (0);
op = tif->tif_rawcp;
occ = tif->tif_rawdatasize - tif->tif_rawcc;
}
*op++ = (uint8_t)j;
occ--;
while (j--)
{
*op++ = (uint8_t)(tp[i++] >> shft & 0xff);
occ--;
}
}
if (rc >= MINRUN)
{ /* write out run */
*op++ = (uint8_t)(128 - 2 + rc);
*op++ = (uint8_t)(tp[beg] >> shft & 0xff);
occ -= 2;
}
else
rc = 0;
}
}
tif->tif_rawcp = op;
tif->tif_rawcc = tif->tif_rawdatasize - occ;
return (1);
}
/*
* Encode a row of 24-bit pixels.
*/
static int LogLuvEncode24(TIFF *tif, uint8_t *bp, tmsize_t cc, uint16_t s)
{
static const char module[] = "LogLuvEncode24";
LogLuvState *sp = EncoderState(tif);
tmsize_t i;
tmsize_t npixels;
tmsize_t occ;
uint8_t *op;
uint32_t *tp;
(void)s;
assert(s == 0);
assert(sp != NULL);
npixels = cc / sp->pixel_size;
if (sp->user_datafmt == SGILOGDATAFMT_RAW)
tp = (uint32_t *)bp;
else
{
tp = (uint32_t *)sp->tbuf;
if (sp->tbuflen < npixels)
{
TIFFErrorExtR(tif, module, "Translation buffer too short");
return (0);
}
(*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 (0);
op = tif->tif_rawcp;
occ = tif->tif_rawdatasize - tif->tif_rawcc;
}
*op++ = (uint8_t)(*tp >> 16);
*op++ = (uint8_t)(*tp >> 8 & 0xff);
*op++ = (uint8_t)(*tp++ & 0xff);
occ -= 3;
}
tif->tif_rawcp = op;
tif->tif_rawcc = tif->tif_rawdatasize - occ;
return (1);
}
/*
* Encode a row of 32-bit pixels.
*/
static int LogLuvEncode32(TIFF *tif, uint8_t *bp, tmsize_t cc, uint16_t s)
{
static const char module[] = "LogLuvEncode32";
LogLuvState *sp = EncoderState(tif);
int shft;
tmsize_t i;
tmsize_t j;
tmsize_t npixels;
uint8_t *op;
uint32_t *tp;
uint32_t b;
tmsize_t occ;
int rc = 0;
tmsize_t beg;
(void)s;
assert(s == 0);
assert(sp != NULL);
npixels = cc / sp->pixel_size;
if (sp->user_datafmt == SGILOGDATAFMT_RAW)
tp = (uint32_t *)bp;
else
{
tp = (uint32_t *)sp->tbuf;
if (sp->tbuflen < npixels)
{
TIFFErrorExtR(tif, module, "Translation buffer too short");
return (0);
}
(*sp->tfunc)(sp, bp, npixels);
}
/* compress each byte string */
op = tif->tif_rawcp;
occ = tif->tif_rawdatasize - tif->tif_rawcc;
for (shft = 24; shft >= 0; shft -= 8)
{
const uint32_t mask = 0xffU << shft; /* find next run */
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 (0);
op = tif->tif_rawcp;
occ = tif->tif_rawdatasize - tif->tif_rawcc;
}
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++ = (uint8_t)(128 - 2 + j - i);
*op++ = (uint8_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 (0);
op = tif->tif_rawcp;
occ = tif->tif_rawdatasize - tif->tif_rawcc;
}
*op++ = (uint8_t)j;
occ--;
while (j--)
{
*op++ = (uint8_t)(tp[i++] >> shft & 0xff);
occ--;
}
}
if (rc >= MINRUN)
{ /* write out run */
*op++ = (uint8_t)(128 - 2 + rc);
*op++ = (uint8_t)(tp[beg] >> shft & 0xff);
occ -= 2;
}
else
rc = 0;
}
}
tif->tif_rawcp = op;
tif->tif_rawcc = tif->tif_rawdatasize - occ;
return (1);
}
/*
* Encode a strip of pixels. We break it into rows to
* avoid encoding runs across row boundaries.
*/
static int LogLuvEncodeStrip(TIFF *tif, uint8_t *bp, tmsize_t cc, uint16_t s)
{
tmsize_t rowlen = TIFFScanlineSize(tif);
if (rowlen == 0)
return 0;
assert(cc % rowlen == 0);
while (cc && (*tif->tif_encoderow)(tif, bp, rowlen, s) == 1)
{
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, uint8_t *bp, tmsize_t cc, uint16_t s)
{
tmsize_t rowlen = TIFFTileRowSize(tif);
if (rowlen == 0)
return 0;
assert(cc % rowlen == 0);
while (cc && (*tif->tif_encoderow)(tif, bp, rowlen, s) == 1)
{
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
#undef log2 /* Conflict with C'99 function */
#define log2(x) ((1. / M_LN2) * log(x))
#undef exp2 /* Conflict with C'99 function */
#define exp2(x) exp(M_LN2 *(x))
static int tiff_itrunc(double x, int m)
{
if (m == SGILOGENCODE_NODITHER)
return (int)x;
/* Silence CoverityScan warning about bad crypto function */
/* coverity[dont_call] */
return (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 tiff_itrunc(256. * (log2(Y) + 64.), em);
if (Y < -5.4136769e-20)
return (~0x7fff | tiff_itrunc(256. * (log2(-Y) + 64.), em));
return (0);
}
static void L16toY(LogLuvState *sp, uint8_t *op, tmsize_t n)
{
int16_t *l16 = (int16_t *)sp->tbuf;
float *yp = (float *)op;
while (n-- > 0)
*yp++ = (float)LogL16toY(*l16++);
}
static void L16toGry(LogLuvState *sp, uint8_t *op, tmsize_t n)
{
int16_t *l16 = (int16_t *)sp->tbuf;
uint8_t *gp = (uint8_t *)op;
while (n-- > 0)
{
double Y = LogL16toY(*l16++);
*gp++ = (uint8_t)((Y <= 0.) ? 0
: (Y >= 1.) ? 255
: (int)(256. * sqrt(Y)));
}
}
static void L16fromY(LogLuvState *sp, uint8_t *op, tmsize_t n)
{
int16_t *l16 = (int16_t *)sp->tbuf;
float *yp = (float *)op;
while (n-- > 0)
*l16++ = (int16_t)(LogL16fromY(*yp++, sp->encode_meth));
}
#if !LOGLUV_PUBLIC
static
#endif
void
XYZtoRGB24(float *xyz, uint8_t *rgb)
{
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_t)((r <= 0.) ? 0 : (r >= 1.) ? 255 : (int)(256. * sqrt(r)));
rgb[1] = (uint8_t)((g <= 0.) ? 0 : (g >= 1.) ? 255 : (int)(256. * sqrt(g)));
rgb[2] = (uint8_t)((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 tiff_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 */
{
unsigned int vi;
int ui;
/* check for NaN */
if (u != u || v != v)
{
u = U_NEU;
v = V_NEU;
}
if (v < UV_VSTART)
return oog_encode(u, v);
vi = tiff_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 = tiff_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 */
{
unsigned int upper, lower;
int ui;
unsigned int 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_t p, float *XYZ)
{
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_t
LogLuv24fromXYZ(float *XYZ, 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, uint8_t *op, tmsize_t n)
{
uint32_t *luv = (uint32_t *)sp->tbuf;
float *xyz = (float *)op;
while (n-- > 0)
{
LogLuv24toXYZ(*luv, xyz);
xyz += 3;
luv++;
}
}
static void Luv24toLuv48(LogLuvState *sp, uint8_t *op, tmsize_t n)
{
uint32_t *luv = (uint32_t *)sp->tbuf;
int16_t *luv3 = (int16_t *)op;
while (n-- > 0)
{
double u, v;
*luv3++ = (int16_t)((*luv >> 12 & 0xffd) + 13314);
if (uv_decode(&u, &v, *luv & 0x3fff) < 0)
{
u = U_NEU;
v = V_NEU;
}
*luv3++ = (int16_t)(u * (1L << 15));
*luv3++ = (int16_t)(v * (1L << 15));
luv++;
}
}
static void Luv24toRGB(LogLuvState *sp, uint8_t *op, tmsize_t n)
{
uint32_t *luv = (uint32_t *)sp->tbuf;
uint8_t *rgb = (uint8_t *)op;
while (n-- > 0)
{
float xyz[3];
LogLuv24toXYZ(*luv++, xyz);
XYZtoRGB24(xyz, rgb);
rgb += 3;
}
}
static void Luv24fromXYZ(LogLuvState *sp, uint8_t *op, tmsize_t n)
{
uint32_t *luv = (uint32_t *)sp->tbuf;
float *xyz = (float *)op;
while (n-- > 0)
{
*luv++ = LogLuv24fromXYZ(xyz, sp->encode_meth);
xyz += 3;
}
}
static void Luv24fromLuv48(LogLuvState *sp, uint8_t *op, tmsize_t n)
{
uint32_t *luv = (uint32_t *)sp->tbuf;
int16_t *luv3 = (int16_t *)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 = tiff_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_t)Le << 14 | Ce;
luv3 += 3;
}
}
#if !LOGLUV_PUBLIC
static
#endif
void
LogLuv32toXYZ(uint32_t p, float *XYZ)
{
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_t
LogLuv32fromXYZ(float *XYZ, 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 = tiff_itrunc(UVSCALE * u, em);
if (ue > 255)
ue = 255;
if (v <= 0.)
ve = 0;
else
ve = tiff_itrunc(UVSCALE * v, em);
if (ve > 255)
ve = 255;
/* combine encodings */
return (Le << 16 | ue << 8 | ve);
}
static void Luv32toXYZ(LogLuvState *sp, uint8_t *op, tmsize_t n)
{
uint32_t *luv = (uint32_t *)sp->tbuf;
float *xyz = (float *)op;
while (n-- > 0)
{
LogLuv32toXYZ(*luv++, xyz);
xyz += 3;
}
}
static void Luv32toLuv48(LogLuvState *sp, uint8_t *op, tmsize_t n)
{
uint32_t *luv = (uint32_t *)sp->tbuf;
int16_t *luv3 = (int16_t *)op;
while (n-- > 0)
{
double u, v;
*luv3++ = (int16_t)(*luv >> 16);
u = 1. / UVSCALE * ((*luv >> 8 & 0xff) + .5);
v = 1. / UVSCALE * ((*luv & 0xff) + .5);
*luv3++ = (int16_t)(u * (1L << 15));
*luv3++ = (int16_t)(v * (1L << 15));
luv++;
}
}
static void Luv32toRGB(LogLuvState *sp, uint8_t *op, tmsize_t n)
{
uint32_t *luv = (uint32_t *)sp->tbuf;
uint8_t *rgb = (uint8_t *)op;
while (n-- > 0)
{
float xyz[3];
LogLuv32toXYZ(*luv++, xyz);
XYZtoRGB24(xyz, rgb);
rgb += 3;
}
}
static void Luv32fromXYZ(LogLuvState *sp, uint8_t *op, tmsize_t n)
{
uint32_t *luv = (uint32_t *)sp->tbuf;
float *xyz = (float *)op;
while (n-- > 0)
{
*luv++ = LogLuv32fromXYZ(xyz, sp->encode_meth);
xyz += 3;
}
}
static void Luv32fromLuv48(LogLuvState *sp, uint8_t *op, tmsize_t n)
{
uint32_t *luv = (uint32_t *)sp->tbuf;
int16_t *luv3 = (int16_t *)op;
if (sp->encode_meth == SGILOGENCODE_NODITHER)
{
while (n-- > 0)
{
*luv++ = (uint32_t)luv3[0] << 16 |
(luv3[1] * (uint32_t)(UVSCALE + .5) >> 7 & 0xff00) |
(luv3[2] * (uint32_t)(UVSCALE + .5) >> 15 & 0xff);
luv3 += 3;
}
return;
}
while (n-- > 0)
{
*luv++ =
(uint32_t)luv3[0] << 16 |
(tiff_itrunc(luv3[1] * (UVSCALE / (1 << 15)), sp->encode_meth)
<< 8 &
0xff00) |
(tiff_itrunc(luv3[2] * (UVSCALE / (1 << 15)), sp->encode_meth) &
0xff);
luv3 += 3;
}
}
static void _logLuvNop(LogLuvState *sp, uint8_t *op, tmsize_t 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 tmsize_t multiply_ms(tmsize_t m1, tmsize_t m2)
{
return _TIFFMultiplySSize(NULL, m1, m2, NULL);
}
static int LogL16InitState(TIFF *tif)
{
static const char module[] = "LogL16InitState";
TIFFDirectory *td = &tif->tif_dir;
LogLuvState *sp = DecoderState(tif);
assert(sp != NULL);
assert(td->td_photometric == PHOTOMETRIC_LOGL);
if (td->td_samplesperpixel != 1)
{
TIFFErrorExtR(tif, module,
"Sorry, can not handle LogL image with %s=%" PRIu16,
"Samples/pixel", td->td_samplesperpixel);
return 0;
}
/* 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_t);
break;
case SGILOGDATAFMT_8BIT:
sp->pixel_size = sizeof(uint8_t);
break;
default:
TIFFErrorExtR(tif, module,
"No support for converting user data format to LogL");
return (0);
}
if (isTiled(tif))
sp->tbuflen = multiply_ms(td->td_tilewidth, td->td_tilelength);
else if (td->td_rowsperstrip < td->td_imagelength)
sp->tbuflen = multiply_ms(td->td_imagewidth, td->td_rowsperstrip);
else
sp->tbuflen = multiply_ms(td->td_imagewidth, td->td_imagelength);
if (multiply_ms(sp->tbuflen, sizeof(int16_t)) == 0 ||
(sp->tbuf = (uint8_t *)_TIFFmallocExt(
tif, sp->tbuflen * sizeof(int16_t))) == NULL)
{
TIFFErrorExtR(tif, module, "No space for SGILog translation buffer");
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)
{
static const char module[] = "LogLuvInitState";
TIFFDirectory *td = &tif->tif_dir;
LogLuvState *sp = DecoderState(tif);
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)
{
TIFFErrorExtR(tif, 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_t);
break;
case SGILOGDATAFMT_RAW:
sp->pixel_size = sizeof(uint32_t);
break;
case SGILOGDATAFMT_8BIT:
sp->pixel_size = 3 * sizeof(uint8_t);
break;
default:
TIFFErrorExtR(
tif, module,
"No support for converting user data format to LogLuv");
return (0);
}
if (isTiled(tif))
sp->tbuflen = multiply_ms(td->td_tilewidth, td->td_tilelength);
else if (td->td_rowsperstrip < td->td_imagelength)
sp->tbuflen = multiply_ms(td->td_imagewidth, td->td_rowsperstrip);
else
sp->tbuflen = multiply_ms(td->td_imagewidth, td->td_imagelength);
if (multiply_ms(sp->tbuflen, sizeof(uint32_t)) == 0 ||
(sp->tbuf = (uint8_t *)_TIFFmallocExt(
tif, sp->tbuflen * sizeof(uint32_t))) == NULL)
{
TIFFErrorExtR(tif, module, "No space for SGILog translation buffer");
return (0);
}
return (1);
}
static int LogLuvFixupTags(TIFF *tif)
{
(void)tif;
return (1);
}
static int LogLuvSetupDecode(TIFF *tif)
{
static const char module[] = "LogLuvSetupDecode";
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:
TIFFErrorExtR(tif, module,
"Inappropriate photometric interpretation %" PRIu16
" for SGILog compression; %s",
td->td_photometric, "must be either LogLUV or LogL");
break;
}
return (0);
}
static int LogLuvSetupEncode(TIFF *tif)
{
static const char module[] = "LogLuvSetupEncode";
LogLuvState *sp = EncoderState(tif);
TIFFDirectory *td = &tif->tif_dir;
switch (td->td_photometric)
{
case PHOTOMETRIC_LOGLUV:
if (!LogLuvInitState(tif))
return (0);
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))
return (0);
tif->tif_encoderow = LogL16Encode;
switch (sp->user_datafmt)
{
case SGILOGDATAFMT_FLOAT:
sp->tfunc = L16fromY;
break;
case SGILOGDATAFMT_16BIT:
break;
default:
goto notsupported;
}
break;
default:
TIFFErrorExtR(tif, module,
"Inappropriate photometric interpretation %" PRIu16
" for SGILog compression; %s",
td->td_photometric, "must be either LogLUV or LogL");
return (0);
}
sp->encoder_state = 1;
return (1);
notsupported:
TIFFErrorExtR(tif, module,
"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)
{
LogLuvState *sp = (LogLuvState *)tif->tif_data;
TIFFDirectory *td = &tif->tif_dir;
assert(sp != 0);
/*
* 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.
* Note: this is really a nasty approach. See PixarLogClose
*/
if (sp->encoder_state)
{
/* See PixarLogClose. Might avoid issues with tags whose size depends
* on those below, but not completely sure this is enough. */
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)
_TIFFfreeExt(tif, sp->tbuf);
_TIFFfreeExt(tif, sp);
tif->tif_data = NULL;
_TIFFSetDefaultCompressionState(tif);
}
static int LogLuvVSetField(TIFF *tif, uint32_t tag, va_list ap)
{
static const char module[] = "LogLuvVSetField";
LogLuvState *sp = DecoderState(tif);
int bps, fmt;
switch (tag)
{
case TIFFTAG_SGILOGDATAFMT:
sp->user_datafmt = (int)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:
TIFFErrorExtR(
tif, 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) : (tmsize_t)-1;
tif->tif_scanlinesize = TIFFScanlineSize(tif);
return (1);
case TIFFTAG_SGILOGENCODE:
sp->encode_meth = (int)va_arg(ap, int);
if (sp->encode_meth != SGILOGENCODE_NODITHER &&
sp->encode_meth != SGILOGENCODE_RANDITHER)
{
TIFFErrorExtR(tif, module,
"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, uint32_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 TIFFField LogLuvFields[] = {
{TIFFTAG_SGILOGDATAFMT, 0, 0, TIFF_SHORT, 0, TIFF_SETGET_INT,
TIFF_SETGET_UNDEFINED, FIELD_PSEUDO, TRUE, FALSE, "SGILogDataFmt", NULL},
{TIFFTAG_SGILOGENCODE, 0, 0, TIFF_SHORT, 0, TIFF_SETGET_INT,
TIFF_SETGET_UNDEFINED, FIELD_PSEUDO, TRUE, FALSE, "SGILogEncode", NULL}};
int TIFFInitSGILog(TIFF *tif, int scheme)
{
static const char module[] = "TIFFInitSGILog";
LogLuvState *sp;
assert(scheme == COMPRESSION_SGILOG24 || scheme == COMPRESSION_SGILOG);
/*
* Merge codec-specific tag information.
*/
if (!_TIFFMergeFields(tif, LogLuvFields, TIFFArrayCount(LogLuvFields)))
{
TIFFErrorExtR(tif, module, "Merging SGILog codec-specific tags failed");
return 0;
}
/*
* Allocate state block so tag methods have storage to record values.
*/
tif->tif_data = (uint8_t *)_TIFFmallocExt(tif, sizeof(LogLuvState));
if (tif->tif_data == NULL)
goto bad;
sp = (LogLuvState *)tif->tif_data;
_TIFFmemset((void *)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_fixuptags = LogLuvFixupTags;
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 parent get/set field methods.
*/
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:
TIFFErrorExtR(tif, module, "%s: No space for LogLuv state block",
tif->tif_name);
return (0);
}
#endif /* LOGLUV_SUPPORT */