diff options
Diffstat (limited to 'tiff/libtiff/tif_luv.c')
| -rw-r--r-- | tiff/libtiff/tif_luv.c | 1629 |
1 files changed, 0 insertions, 1629 deletions
diff --git a/tiff/libtiff/tif_luv.c b/tiff/libtiff/tif_luv.c deleted file mode 100644 index eb622b9..0000000 --- a/tiff/libtiff/tif_luv.c +++ /dev/null @@ -1,1629 +0,0 @@ -/* $Id: tif_luv.c,v 1.17.2.4 2010-06-08 18:50:42 bfriesen 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 (1); -} - -/* - * 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 (1); -} - -/* - * 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 (1); -} - -/* - * 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) == 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, 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) == 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 -#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); - } - if( isTiled(tif) ) - sp->tbuflen = multiply(td->td_tilewidth, td->td_tilelength); - else - 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); - } - if( isTiled(tif) ) - sp->tbuflen = multiply(td->td_tilewidth, td->td_tilelength); - else - 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); - - /* - * Merge codec-specific tag information. - */ - if (!_TIFFMergeFieldInfo(tif, LogLuvFieldInfo, - TIFFArrayCount(LogLuvFieldInfo))) { - TIFFErrorExt(tif->tif_clientdata, module, - "Merging SGILog codec-specific tags failed"); - return 0; - } - - /* - * 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 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: - 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: */ -/* - * Local Variables: - * mode: c - * c-basic-offset: 8 - * fill-column: 78 - * End: - */ |