opencv

1
/*
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 * Copyright (c) 1997 Greg Ward Larson
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 * Copyright (c) 1997 Silicon Graphics, Inc.
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 *
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 * Permission to use, copy, modify, distribute, and sell this software and
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 * its documentation for any purpose is hereby granted without fee, provided
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 * that (i) the above copyright notices and this permission notice appear in
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 * all copies of the software and related documentation, and (ii) the names of
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 * Sam Leffler, Greg Larson and Silicon Graphics may not be used in any
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 * advertising or publicity relating to the software without the specific,
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 * prior written permission of Sam Leffler, Greg Larson and Silicon Graphics.
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 *
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 * THE SOFTWARE IS PROVIDED "AS-IS" AND WITHOUT WARRANTY OF ANY KIND,
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 * EXPRESS, IMPLIED OR OTHERWISE, INCLUDING WITHOUT LIMITATION, ANY
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 * WARRANTY OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE.
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 *
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 * IN NO EVENT SHALL SAM LEFFLER, GREG LARSON OR SILICON GRAPHICS BE LIABLE
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 * FOR ANY SPECIAL, INCIDENTAL, INDIRECT OR CONSEQUENTIAL DAMAGES OF ANY KIND,
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 * OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
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 * WHETHER OR NOT ADVISED OF THE POSSIBILITY OF DAMAGE, AND ON ANY THEORY OF
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 * LIABILITY, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
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 * OF THIS SOFTWARE.
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 */
24

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#include "tiffiop.h"
26
#ifdef LOGLUV_SUPPORT
27

28
/*
29
 * TIFF Library.
30
 * LogLuv compression support for high dynamic range images.
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 *
32
 * Contributed by Greg Larson.
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 *
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 * LogLuv image support uses the TIFF library to store 16 or 10-bit
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 * log luminance values with 8 bits each of u and v or a 14-bit index.
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 *
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 * The codec can take as input and produce as output 32-bit IEEE float values
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 * as well as 16-bit integer values.  A 16-bit luminance is interpreted
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 * as a sign bit followed by a 15-bit integer that is converted
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 * to and from a linear magnitude using the transformation:
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 *
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 *	L = 2^( (Le+.5)/256 - 64 )		# real from 15-bit
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 *
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 *	Le = floor( 256*(log2(L) + 64) )	# 15-bit from real
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 *
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 * The actual conversion to world luminance units in candelas per sq. meter
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 * requires an additional multiplier, which is stored in the TIFFTAG_STONITS.
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 * This value is usually set such that a reasonable exposure comes from
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 * clamping decoded luminances above 1 to 1 in the displayed image.
50
 *
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 * The 16-bit values for u and v may be converted to real values by dividing
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 * each by 32768.  (This allows for negative values, which aren't useful as
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 * far as we know, but are left in case of future improvements in human
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 * color vision.)
55
 *
56
 * Conversion from (u,v), which is actually the CIE (u',v') system for
57
 * you color scientists, is accomplished by the following transformation:
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 *
59
 *	u = 4*x / (-2*x + 12*y + 3)
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 *	v = 9*y / (-2*x + 12*y + 3)
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 *
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 *	x = 9*u / (6*u - 16*v + 12)
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 *	y = 4*v / (6*u - 16*v + 12)
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 *
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 * This process is greatly simplified by passing 32-bit IEEE floats
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 * for each of three CIE XYZ coordinates.  The codec then takes care
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 * of conversion to and from LogLuv, though the application is still
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 * responsible for interpreting the TIFFTAG_STONITS calibration factor.
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 *
70
 * By definition, a CIE XYZ vector of [1 1 1] corresponds to a neutral white
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 * point of (x,y)=(1/3,1/3).  However, most color systems assume some other
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 * white point, such as D65, and an absolute color conversion to XYZ then
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 * to another color space with a different white point may introduce an
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 * unwanted color cast to the image.  It is often desirable, therefore, to
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 * perform a white point conversion that maps the input white to [1 1 1]
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 * in XYZ, then record the original white point using the TIFFTAG_WHITEPOINT
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 * tag value.  A decoder that demands absolute color calibration may use
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 * this white point tag to get back the original colors, but usually it
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 * will be ignored and the new white point will be used instead that
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 * matches the output color space.
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 *
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 * Pixel information is compressed into one of two basic encodings, depending
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 * on the setting of the compression tag, which is one of COMPRESSION_SGILOG
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 * or COMPRESSION_SGILOG24.  For COMPRESSION_SGILOG, greyscale data is
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 * stored as:
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 *
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 *	 1       15
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 *	|-+---------------|
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 *
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 * COMPRESSION_SGILOG color data is stored as:
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 *
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 *	 1       15           8        8
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 *	|-+---------------|--------+--------|
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 *	 S       Le           ue       ve
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 *
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 * For the 24-bit COMPRESSION_SGILOG24 color format, the data is stored as:
97
 *
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 *	     10           14
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 *	|----------|--------------|
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 *	     Le'          Ce
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 *
102
 * There is no sign bit in the 24-bit case, and the (u,v) chromaticity is
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 * encoded as an index for optimal color resolution.  The 10 log bits are
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 * defined by the following conversions:
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 *
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 *	L = 2^((Le'+.5)/64 - 12)		# real from 10-bit
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 *
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 *	Le' = floor( 64*(log2(L) + 12) )	# 10-bit from real
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 *
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 * The 10 bits of the smaller format may be converted into the 15 bits of
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 * the larger format by multiplying by 4 and adding 13314.  Obviously,
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 * a smaller range of magnitudes is covered (about 5 orders of magnitude
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 * instead of 38), and the lack of a sign bit means that negative luminances
114
 * are not allowed.  (Well, they aren't allowed in the real world, either,
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 * but they are useful for certain types of image processing.)
116
 *
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 * The desired user format is controlled by the setting the internal
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 * pseudo tag TIFFTAG_SGILOGDATAFMT to one of:
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 *  SGILOGDATAFMT_FLOAT       = IEEE 32-bit float XYZ values
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 *  SGILOGDATAFMT_16BIT	      = 16-bit integer encodings of logL, u and v
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 * Raw data i/o is also possible using:
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 *  SGILOGDATAFMT_RAW         = 32-bit unsigned integer with encoded pixel
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 * In addition, the following decoding is provided for ease of display:
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 *  SGILOGDATAFMT_8BIT        = 8-bit default RGB gamma-corrected values
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 *
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 * For grayscale images, we provide the following data formats:
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 *  SGILOGDATAFMT_FLOAT       = IEEE 32-bit float Y values
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 *  SGILOGDATAFMT_16BIT       = 16-bit integer w/ encoded luminance
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 *  SGILOGDATAFMT_8BIT        = 8-bit gray monitor values
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 *
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 * Note that the COMPRESSION_SGILOG applies a simple run-length encoding
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 * scheme by separating the logL, u and v bytes for each row and applying
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 * a PackBits type of compression.  Since the 24-bit encoding is not
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 * adaptive, the 32-bit color format takes less space in many cases.
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 *
136
 * Further control is provided over the conversion from higher-resolution
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 * formats to final encoded values through the pseudo tag
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 * TIFFTAG_SGILOGENCODE:
139
 *  SGILOGENCODE_NODITHER     = do not dither encoded values
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 *  SGILOGENCODE_RANDITHER    = apply random dithering during encoding
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 *
142
 * The default value of this tag is SGILOGENCODE_NODITHER for
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 * COMPRESSION_SGILOG to maximize run-length encoding and
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 * SGILOGENCODE_RANDITHER for COMPRESSION_SGILOG24 to turn
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 * quantization errors into noise.
146
 */
147

148
#include <math.h>
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#include <stdio.h>
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#include <stdlib.h>
151

152
/*
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 * State block for each open TIFF
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 * file using LogLuv compression/decompression.
155
 */
156
typedef struct logLuvState LogLuvState;
157

158
struct logLuvState
159
{
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    int encoder_state; /* 1 if encoder correctly initialized */
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    int user_datafmt;  /* user data format */
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    int encode_meth;   /* encoding method */
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    int pixel_size;    /* bytes per pixel */
164

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    uint8_t *tbuf;    /* translation buffer */
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    tmsize_t tbuflen; /* buffer length */
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    void (*tfunc)(LogLuvState *, uint8_t *, tmsize_t);
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169
    TIFFVSetMethod vgetparent; /* super-class method */
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    TIFFVSetMethod vsetparent; /* super-class method */
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};
172

173
#define DecoderState(tif) ((LogLuvState *)(tif)->tif_data)
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#define EncoderState(tif) ((LogLuvState *)(tif)->tif_data)
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176
#define SGILOGDATAFMT_UNKNOWN -1
177

178
#define MINRUN 4 /* minimum run length */
179

180
/*
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 * Decode a string of 16-bit gray pixels.
182
 */
183
static int LogL16Decode(TIFF *tif, uint8_t *op, tmsize_t occ, uint16_t s)
184
{
185
    static const char module[] = "LogL16Decode";
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    LogLuvState *sp = DecoderState(tif);
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    int shft;
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    tmsize_t i;
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    tmsize_t npixels;
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    unsigned char *bp;
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    int16_t *tp;
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    int16_t b;
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    tmsize_t cc;
194
    int rc;
195

196
    (void)s;
197
    assert(s == 0);
198
    assert(sp != NULL);
199

200
    npixels = occ / sp->pixel_size;
201

202
    if (sp->user_datafmt == SGILOGDATAFMT_16BIT)
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        tp = (int16_t *)op;
204
    else
205
    {
206
        if (sp->tbuflen < npixels)
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        {
208
            TIFFErrorExtR(tif, module, "Translation buffer too short");
209
            return (0);
210
        }
211
        tp = (int16_t *)sp->tbuf;
212
    }
213
    _TIFFmemset((void *)tp, 0, npixels * sizeof(tp[0]));
214

215
    bp = (unsigned char *)tif->tif_rawcp;
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    cc = tif->tif_rawcc;
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    /* get each byte string */
218
    for (shft = 8; shft >= 0; shft -= 8)
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    {
220
        for (i = 0; i < npixels && cc > 0;)
221
        {
222
            if (*bp >= 128)
223
            { /* run */
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                if (cc < 2)
225
                    break;
226
                rc = *bp++ + (2 - 128);
227
                b = (int16_t)(*bp++ << shft);
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                cc -= 2;
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                while (rc-- && i < npixels)
230
                    tp[i++] |= b;
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            }
232
            else
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            {               /* non-run */
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                rc = *bp++; /* nul is noop */
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                while (--cc && rc-- && i < npixels)
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                    tp[i++] |= (int16_t)*bp++ << shft;
237
            }
238
        }
239
        if (i != npixels)
240
        {
241
            TIFFErrorExtR(tif, module,
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                          "Not enough data at row %" PRIu32
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                          " (short %" TIFF_SSIZE_FORMAT " pixels)",
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                          tif->tif_row, npixels - i);
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            tif->tif_rawcp = (uint8_t *)bp;
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            tif->tif_rawcc = cc;
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            return (0);
248
        }
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    }
250
    (*sp->tfunc)(sp, op, npixels);
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    tif->tif_rawcp = (uint8_t *)bp;
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    tif->tif_rawcc = cc;
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    return (1);
254
}
255

256
/*
257
 * Decode a string of 24-bit pixels.
258
 */
259
static int LogLuvDecode24(TIFF *tif, uint8_t *op, tmsize_t occ, uint16_t s)
260
{
261
    static const char module[] = "LogLuvDecode24";
262
    LogLuvState *sp = DecoderState(tif);
263
    tmsize_t cc;
264
    tmsize_t i;
265
    tmsize_t npixels;
266
    unsigned char *bp;
267
    uint32_t *tp;
268

269
    (void)s;
270
    assert(s == 0);
271
    assert(sp != NULL);
272

273
    npixels = occ / sp->pixel_size;
274

275
    if (sp->user_datafmt == SGILOGDATAFMT_RAW)
276
        tp = (uint32_t *)op;
277
    else
278
    {
279
        if (sp->tbuflen < npixels)
280
        {
281
            TIFFErrorExtR(tif, module, "Translation buffer too short");
282
            return (0);
283
        }
284
        tp = (uint32_t *)sp->tbuf;
285
    }
286
    /* copy to array of uint32_t */
287
    bp = (unsigned char *)tif->tif_rawcp;
288
    cc = tif->tif_rawcc;
289
    for (i = 0; i < npixels && cc >= 3; i++)
290
    {
291
        tp[i] = bp[0] << 16 | bp[1] << 8 | bp[2];
292
        bp += 3;
293
        cc -= 3;
294
    }
295
    tif->tif_rawcp = (uint8_t *)bp;
296
    tif->tif_rawcc = cc;
297
    if (i != npixels)
298
    {
299
        TIFFErrorExtR(tif, module,
300
                      "Not enough data at row %" PRIu32
301
                      " (short %" TIFF_SSIZE_FORMAT " pixels)",
302
                      tif->tif_row, npixels - i);
303
        return (0);
304
    }
305
    (*sp->tfunc)(sp, op, npixels);
306
    return (1);
307
}
308

309
/*
310
 * Decode a string of 32-bit pixels.
311
 */
312
static int LogLuvDecode32(TIFF *tif, uint8_t *op, tmsize_t occ, uint16_t s)
313
{
314
    static const char module[] = "LogLuvDecode32";
315
    LogLuvState *sp;
316
    int shft;
317
    tmsize_t i;
318
    tmsize_t npixels;
319
    unsigned char *bp;
320
    uint32_t *tp;
321
    uint32_t b;
322
    tmsize_t cc;
323
    int rc;
324

325
    (void)s;
326
    assert(s == 0);
327
    sp = DecoderState(tif);
328
    assert(sp != NULL);
329

330
    npixels = occ / sp->pixel_size;
331

332
    if (sp->user_datafmt == SGILOGDATAFMT_RAW)
333
        tp = (uint32_t *)op;
334
    else
335
    {
336
        if (sp->tbuflen < npixels)
337
        {
338
            TIFFErrorExtR(tif, module, "Translation buffer too short");
339
            return (0);
340
        }
341
        tp = (uint32_t *)sp->tbuf;
342
    }
343
    _TIFFmemset((void *)tp, 0, npixels * sizeof(tp[0]));
344

345
    bp = (unsigned char *)tif->tif_rawcp;
346
    cc = tif->tif_rawcc;
347
    /* get each byte string */
348
    for (shft = 24; shft >= 0; shft -= 8)
349
    {
350
        for (i = 0; i < npixels && cc > 0;)
351
        {
352
            if (*bp >= 128)
353
            { /* run */
354
                if (cc < 2)
355
                    break;
356
                rc = *bp++ + (2 - 128);
357
                b = (uint32_t)*bp++ << shft;
358
                cc -= 2;
359
                while (rc-- && i < npixels)
360
                    tp[i++] |= b;
361
            }
362
            else
363
            {               /* non-run */
364
                rc = *bp++; /* nul is noop */
365
                while (--cc && rc-- && i < npixels)
366
                    tp[i++] |= (uint32_t)*bp++ << shft;
367
            }
368
        }
369
        if (i != npixels)
370
        {
371
            TIFFErrorExtR(tif, module,
372
                          "Not enough data at row %" PRIu32
373
                          " (short %" TIFF_SSIZE_FORMAT " pixels)",
374
                          tif->tif_row, npixels - i);
375
            tif->tif_rawcp = (uint8_t *)bp;
376
            tif->tif_rawcc = cc;
377
            return (0);
378
        }
379
    }
380
    (*sp->tfunc)(sp, op, npixels);
381
    tif->tif_rawcp = (uint8_t *)bp;
382
    tif->tif_rawcc = cc;
383
    return (1);
384
}
385

386
/*
387
 * Decode a strip of pixels.  We break it into rows to
388
 * maintain synchrony with the encode algorithm, which
389
 * is row by row.
390
 */
391
static int LogLuvDecodeStrip(TIFF *tif, uint8_t *bp, tmsize_t cc, uint16_t s)
392
{
393
    tmsize_t rowlen = TIFFScanlineSize(tif);
394

395
    if (rowlen == 0)
396
        return 0;
397

398
    assert(cc % rowlen == 0);
399
    while (cc && (*tif->tif_decoderow)(tif, bp, rowlen, s))
400
    {
401
        bp += rowlen;
402
        cc -= rowlen;
403
    }
404
    return (cc == 0);
405
}
406

407
/*
408
 * Decode a tile of pixels.  We break it into rows to
409
 * maintain synchrony with the encode algorithm, which
410
 * is row by row.
411
 */
412
static int LogLuvDecodeTile(TIFF *tif, uint8_t *bp, tmsize_t cc, uint16_t s)
413
{
414
    tmsize_t rowlen = TIFFTileRowSize(tif);
415

416
    if (rowlen == 0)
417
        return 0;
418

419
    assert(cc % rowlen == 0);
420
    while (cc && (*tif->tif_decoderow)(tif, bp, rowlen, s))
421
    {
422
        bp += rowlen;
423
        cc -= rowlen;
424
    }
425
    return (cc == 0);
426
}
427

428
/*
429
 * Encode a row of 16-bit pixels.
430
 */
431
static int LogL16Encode(TIFF *tif, uint8_t *bp, tmsize_t cc, uint16_t s)
432
{
433
    static const char module[] = "LogL16Encode";
434
    LogLuvState *sp = EncoderState(tif);
435
    int shft;
436
    tmsize_t i;
437
    tmsize_t j;
438
    tmsize_t npixels;
439
    uint8_t *op;
440
    int16_t *tp;
441
    int16_t b;
442
    tmsize_t occ;
443
    int rc = 0, mask;
444
    tmsize_t beg;
445

446
    (void)s;
447
    assert(s == 0);
448
    assert(sp != NULL);
449
    npixels = cc / sp->pixel_size;
450

451
    if (sp->user_datafmt == SGILOGDATAFMT_16BIT)
452
        tp = (int16_t *)bp;
453
    else
454
    {
455
        tp = (int16_t *)sp->tbuf;
456
        if (sp->tbuflen < npixels)
457
        {
458
            TIFFErrorExtR(tif, module, "Translation buffer too short");
459
            return (0);
460
        }
461
        (*sp->tfunc)(sp, bp, npixels);
462
    }
463
    /* compress each byte string */
464
    op = tif->tif_rawcp;
465
    occ = tif->tif_rawdatasize - tif->tif_rawcc;
466
    for (shft = 8; shft >= 0; shft -= 8)
467
    {
468
        for (i = 0; i < npixels; i += rc)
469
        {
470
            if (occ < 4)
471
            {
472
                tif->tif_rawcp = op;
473
                tif->tif_rawcc = tif->tif_rawdatasize - occ;
474
                if (!TIFFFlushData1(tif))
475
                    return (0);
476
                op = tif->tif_rawcp;
477
                occ = tif->tif_rawdatasize - tif->tif_rawcc;
478
            }
479
            mask = 0xff << shft; /* find next run */
480
            for (beg = i; beg < npixels; beg += rc)
481
            {
482
                b = (int16_t)(tp[beg] & mask);
483
                rc = 1;
484
                while (rc < 127 + 2 && beg + rc < npixels &&
485
                       (tp[beg + rc] & mask) == b)
486
                    rc++;
487
                if (rc >= MINRUN)
488
                    break; /* long enough */
489
            }
490
            if (beg - i > 1 && beg - i < MINRUN)
491
            {
492
                b = (int16_t)(tp[i] & mask); /*check short run */
493
                j = i + 1;
494
                while ((tp[j++] & mask) == b)
495
                    if (j == beg)
496
                    {
497
                        *op++ = (uint8_t)(128 - 2 + j - i);
498
                        *op++ = (uint8_t)(b >> shft);
499
                        occ -= 2;
500
                        i = beg;
501
                        break;
502
                    }
503
            }
504
            while (i < beg)
505
            { /* write out non-run */
506
                if ((j = beg - i) > 127)
507
                    j = 127;
508
                if (occ < j + 3)
509
                {
510
                    tif->tif_rawcp = op;
511
                    tif->tif_rawcc = tif->tif_rawdatasize - occ;
512
                    if (!TIFFFlushData1(tif))
513
                        return (0);
514
                    op = tif->tif_rawcp;
515
                    occ = tif->tif_rawdatasize - tif->tif_rawcc;
516
                }
517
                *op++ = (uint8_t)j;
518
                occ--;
519
                while (j--)
520
                {
521
                    *op++ = (uint8_t)(tp[i++] >> shft & 0xff);
522
                    occ--;
523
                }
524
            }
525
            if (rc >= MINRUN)
526
            { /* write out run */
527
                *op++ = (uint8_t)(128 - 2 + rc);
528
                *op++ = (uint8_t)(tp[beg] >> shft & 0xff);
529
                occ -= 2;
530
            }
531
            else
532
                rc = 0;
533
        }
534
    }
535
    tif->tif_rawcp = op;
536
    tif->tif_rawcc = tif->tif_rawdatasize - occ;
537

538
    return (1);
539
}
540

541
/*
542
 * Encode a row of 24-bit pixels.
543
 */
544
static int LogLuvEncode24(TIFF *tif, uint8_t *bp, tmsize_t cc, uint16_t s)
545
{
546
    static const char module[] = "LogLuvEncode24";
547
    LogLuvState *sp = EncoderState(tif);
548
    tmsize_t i;
549
    tmsize_t npixels;
550
    tmsize_t occ;
551
    uint8_t *op;
552
    uint32_t *tp;
553

554
    (void)s;
555
    assert(s == 0);
556
    assert(sp != NULL);
557
    npixels = cc / sp->pixel_size;
558

559
    if (sp->user_datafmt == SGILOGDATAFMT_RAW)
560
        tp = (uint32_t *)bp;
561
    else
562
    {
563
        tp = (uint32_t *)sp->tbuf;
564
        if (sp->tbuflen < npixels)
565
        {
566
            TIFFErrorExtR(tif, module, "Translation buffer too short");
567
            return (0);
568
        }
569
        (*sp->tfunc)(sp, bp, npixels);
570
    }
571
    /* write out encoded pixels */
572
    op = tif->tif_rawcp;
573
    occ = tif->tif_rawdatasize - tif->tif_rawcc;
574
    for (i = npixels; i--;)
575
    {
576
        if (occ < 3)
577
        {
578
            tif->tif_rawcp = op;
579
            tif->tif_rawcc = tif->tif_rawdatasize - occ;
580
            if (!TIFFFlushData1(tif))
581
                return (0);
582
            op = tif->tif_rawcp;
583
            occ = tif->tif_rawdatasize - tif->tif_rawcc;
584
        }
585
        *op++ = (uint8_t)(*tp >> 16);
586
        *op++ = (uint8_t)(*tp >> 8 & 0xff);
587
        *op++ = (uint8_t)(*tp++ & 0xff);
588
        occ -= 3;
589
    }
590
    tif->tif_rawcp = op;
591
    tif->tif_rawcc = tif->tif_rawdatasize - occ;
592

593
    return (1);
594
}
595

596
/*
597
 * Encode a row of 32-bit pixels.
598
 */
599
static int LogLuvEncode32(TIFF *tif, uint8_t *bp, tmsize_t cc, uint16_t s)
600
{
601
    static const char module[] = "LogLuvEncode32";
602
    LogLuvState *sp = EncoderState(tif);
603
    int shft;
604
    tmsize_t i;
605
    tmsize_t j;
606
    tmsize_t npixels;
607
    uint8_t *op;
608
    uint32_t *tp;
609
    uint32_t b;
610
    tmsize_t occ;
611
    int rc = 0;
612
    tmsize_t beg;
613

614
    (void)s;
615
    assert(s == 0);
616
    assert(sp != NULL);
617

618
    npixels = cc / sp->pixel_size;
619

620
    if (sp->user_datafmt == SGILOGDATAFMT_RAW)
621
        tp = (uint32_t *)bp;
622
    else
623
    {
624
        tp = (uint32_t *)sp->tbuf;
625
        if (sp->tbuflen < npixels)
626
        {
627
            TIFFErrorExtR(tif, module, "Translation buffer too short");
628
            return (0);
629
        }
630
        (*sp->tfunc)(sp, bp, npixels);
631
    }
632
    /* compress each byte string */
633
    op = tif->tif_rawcp;
634
    occ = tif->tif_rawdatasize - tif->tif_rawcc;
635
    for (shft = 24; shft >= 0; shft -= 8)
636
    {
637
        const uint32_t mask = 0xffU << shft; /* find next run */
638
        for (i = 0; i < npixels; i += rc)
639
        {
640
            if (occ < 4)
641
            {
642
                tif->tif_rawcp = op;
643
                tif->tif_rawcc = tif->tif_rawdatasize - occ;
644
                if (!TIFFFlushData1(tif))
645
                    return (0);
646
                op = tif->tif_rawcp;
647
                occ = tif->tif_rawdatasize - tif->tif_rawcc;
648
            }
649
            for (beg = i; beg < npixels; beg += rc)
650
            {
651
                b = tp[beg] & mask;
652
                rc = 1;
653
                while (rc < 127 + 2 && beg + rc < npixels &&
654
                       (tp[beg + rc] & mask) == b)
655
                    rc++;
656
                if (rc >= MINRUN)
657
                    break; /* long enough */
658
            }
659
            if (beg - i > 1 && beg - i < MINRUN)
660
            {
661
                b = tp[i] & mask; /* check short run */
662
                j = i + 1;
663
                while ((tp[j++] & mask) == b)
664
                    if (j == beg)
665
                    {
666
                        *op++ = (uint8_t)(128 - 2 + j - i);
667
                        *op++ = (uint8_t)(b >> shft);
668
                        occ -= 2;
669
                        i = beg;
670
                        break;
671
                    }
672
            }
673
            while (i < beg)
674
            { /* write out non-run */
675
                if ((j = beg - i) > 127)
676
                    j = 127;
677
                if (occ < j + 3)
678
                {
679
                    tif->tif_rawcp = op;
680
                    tif->tif_rawcc = tif->tif_rawdatasize - occ;
681
                    if (!TIFFFlushData1(tif))
682
                        return (0);
683
                    op = tif->tif_rawcp;
684
                    occ = tif->tif_rawdatasize - tif->tif_rawcc;
685
                }
686
                *op++ = (uint8_t)j;
687
                occ--;
688
                while (j--)
689
                {
690
                    *op++ = (uint8_t)(tp[i++] >> shft & 0xff);
691
                    occ--;
692
                }
693
            }
694
            if (rc >= MINRUN)
695
            { /* write out run */
696
                *op++ = (uint8_t)(128 - 2 + rc);
697
                *op++ = (uint8_t)(tp[beg] >> shft & 0xff);
698
                occ -= 2;
699
            }
700
            else
701
                rc = 0;
702
        }
703
    }
704
    tif->tif_rawcp = op;
705
    tif->tif_rawcc = tif->tif_rawdatasize - occ;
706

707
    return (1);
708
}
709

710
/*
711
 * Encode a strip of pixels.  We break it into rows to
712
 * avoid encoding runs across row boundaries.
713
 */
714
static int LogLuvEncodeStrip(TIFF *tif, uint8_t *bp, tmsize_t cc, uint16_t s)
715
{
716
    tmsize_t rowlen = TIFFScanlineSize(tif);
717

718
    if (rowlen == 0)
719
        return 0;
720

721
    assert(cc % rowlen == 0);
722
    while (cc && (*tif->tif_encoderow)(tif, bp, rowlen, s) == 1)
723
    {
724
        bp += rowlen;
725
        cc -= rowlen;
726
    }
727
    return (cc == 0);
728
}
729

730
/*
731
 * Encode a tile of pixels.  We break it into rows to
732
 * avoid encoding runs across row boundaries.
733
 */
734
static int LogLuvEncodeTile(TIFF *tif, uint8_t *bp, tmsize_t cc, uint16_t s)
735
{
736
    tmsize_t rowlen = TIFFTileRowSize(tif);
737

738
    if (rowlen == 0)
739
        return 0;
740

741
    assert(cc % rowlen == 0);
742
    while (cc && (*tif->tif_encoderow)(tif, bp, rowlen, s) == 1)
743
    {
744
        bp += rowlen;
745
        cc -= rowlen;
746
    }
747
    return (cc == 0);
748
}
749

750
/*
751
 * Encode/Decode functions for converting to and from user formats.
752
 */
753

754
#include "uvcode.h"
755

756
#ifndef UVSCALE
757
#define U_NEU 0.210526316
758
#define V_NEU 0.473684211
759
#define UVSCALE 410.
760
#endif
761

762
#ifndef M_LN2
763
#define M_LN2 0.69314718055994530942
764
#endif
765
#ifndef M_PI
766
#define M_PI 3.14159265358979323846
767
#endif
768
#undef log2 /* Conflict with C'99 function */
769
#define log2(x) ((1. / M_LN2) * log(x))
770
#undef exp2 /* Conflict with C'99 function */
771
#define exp2(x) exp(M_LN2 *(x))
772

773
static int tiff_itrunc(double x, int m)
774
{
775
    if (m == SGILOGENCODE_NODITHER)
776
        return (int)x;
777
    /* Silence CoverityScan warning about bad crypto function */
778
    /* coverity[dont_call] */
779
    return (int)(x + rand() * (1. / RAND_MAX) - .5);
780
}
781

782
#if !LOGLUV_PUBLIC
783
static
784
#endif
785
    double
786
    LogL16toY(int p16) /* compute luminance from 16-bit LogL */
787
{
788
    int Le = p16 & 0x7fff;
789
    double Y;
790

791
    if (!Le)
792
        return (0.);
793
    Y = exp(M_LN2 / 256. * (Le + .5) - M_LN2 * 64.);
794
    return (!(p16 & 0x8000) ? Y : -Y);
795
}
796

797
#if !LOGLUV_PUBLIC
798
static
799
#endif
800
    int
801
    LogL16fromY(double Y, int em) /* get 16-bit LogL from Y */
802
{
803
    if (Y >= 1.8371976e19)
804
        return (0x7fff);
805
    if (Y <= -1.8371976e19)
806
        return (0xffff);
807
    if (Y > 5.4136769e-20)
808
        return tiff_itrunc(256. * (log2(Y) + 64.), em);
809
    if (Y < -5.4136769e-20)
810
        return (~0x7fff | tiff_itrunc(256. * (log2(-Y) + 64.), em));
811
    return (0);
812
}
813

814
static void L16toY(LogLuvState *sp, uint8_t *op, tmsize_t n)
815
{
816
    int16_t *l16 = (int16_t *)sp->tbuf;
817
    float *yp = (float *)op;
818

819
    while (n-- > 0)
820
        *yp++ = (float)LogL16toY(*l16++);
821
}
822

823
static void L16toGry(LogLuvState *sp, uint8_t *op, tmsize_t n)
824
{
825
    int16_t *l16 = (int16_t *)sp->tbuf;
826
    uint8_t *gp = (uint8_t *)op;
827

828
    while (n-- > 0)
829
    {
830
        double Y = LogL16toY(*l16++);
831
        *gp++ = (uint8_t)((Y <= 0.)   ? 0
832
                          : (Y >= 1.) ? 255
833
                                      : (int)(256. * sqrt(Y)));
834
    }
835
}
836

837
static void L16fromY(LogLuvState *sp, uint8_t *op, tmsize_t n)
838
{
839
    int16_t *l16 = (int16_t *)sp->tbuf;
840
    float *yp = (float *)op;
841

842
    while (n-- > 0)
843
        *l16++ = (int16_t)(LogL16fromY(*yp++, sp->encode_meth));
844
}
845

846
#if !LOGLUV_PUBLIC
847
static
848
#endif
849
    void
850
    XYZtoRGB24(float *xyz, uint8_t *rgb)
851
{
852
    double r, g, b;
853
    /* assume CCIR-709 primaries */
854
    r = 2.690 * xyz[0] + -1.276 * xyz[1] + -0.414 * xyz[2];
855
    g = -1.022 * xyz[0] + 1.978 * xyz[1] + 0.044 * xyz[2];
856
    b = 0.061 * xyz[0] + -0.224 * xyz[1] + 1.163 * xyz[2];
857
    /* assume 2.0 gamma for speed */
858
    /* could use integer sqrt approx., but this is probably faster */
859
    rgb[0] = (uint8_t)((r <= 0.) ? 0 : (r >= 1.) ? 255 : (int)(256. * sqrt(r)));
860
    rgb[1] = (uint8_t)((g <= 0.) ? 0 : (g >= 1.) ? 255 : (int)(256. * sqrt(g)));
861
    rgb[2] = (uint8_t)((b <= 0.) ? 0 : (b >= 1.) ? 255 : (int)(256. * sqrt(b)));
862
}
863

864
#if !LOGLUV_PUBLIC
865
static
866
#endif
867
    double
868
    LogL10toY(int p10) /* compute luminance from 10-bit LogL */
869
{
870
    if (p10 == 0)
871
        return (0.);
872
    return (exp(M_LN2 / 64. * (p10 + .5) - M_LN2 * 12.));
873
}
874

875
#if !LOGLUV_PUBLIC
876
static
877
#endif
878
    int
879
    LogL10fromY(double Y, int em) /* get 10-bit LogL from Y */
880
{
881
    if (Y >= 15.742)
882
        return (0x3ff);
883
    else if (Y <= .00024283)
884
        return (0);
885
    else
886
        return tiff_itrunc(64. * (log2(Y) + 12.), em);
887
}
888

889
#define NANGLES 100
890
#define uv2ang(u, v)                                                           \
891
    ((NANGLES * .499999999 / M_PI) * atan2((v)-V_NEU, (u)-U_NEU) + .5 * NANGLES)
892

893
static int oog_encode(double u, double v) /* encode out-of-gamut chroma */
894
{
895
    static int oog_table[NANGLES];
896
    static int initialized = 0;
897
    register int i;
898

899
    if (!initialized)
900
    { /* set up perimeter table */
901
        double eps[NANGLES], ua, va, ang, epsa;
902
        int ui, vi, ustep;
903
        for (i = NANGLES; i--;)
904
            eps[i] = 2.;
905
        for (vi = UV_NVS; vi--;)
906
        {
907
            va = UV_VSTART + (vi + .5) * UV_SQSIZ;
908
            ustep = uv_row[vi].nus - 1;
909
            if (vi == UV_NVS - 1 || vi == 0 || ustep <= 0)
910
                ustep = 1;
911
            for (ui = uv_row[vi].nus - 1; ui >= 0; ui -= ustep)
912
            {
913
                ua = uv_row[vi].ustart + (ui + .5) * UV_SQSIZ;
914
                ang = uv2ang(ua, va);
915
                i = (int)ang;
916
                epsa = fabs(ang - (i + .5));
917
                if (epsa < eps[i])
918
                {
919
                    oog_table[i] = uv_row[vi].ncum + ui;
920
                    eps[i] = epsa;
921
                }
922
            }
923
        }
924
        for (i = NANGLES; i--;) /* fill any holes */
925
            if (eps[i] > 1.5)
926
            {
927
                int i1, i2;
928
                for (i1 = 1; i1 < NANGLES / 2; i1++)
929
                    if (eps[(i + i1) % NANGLES] < 1.5)
930
                        break;
931
                for (i2 = 1; i2 < NANGLES / 2; i2++)
932
                    if (eps[(i + NANGLES - i2) % NANGLES] < 1.5)
933
                        break;
934
                if (i1 < i2)
935
                    oog_table[i] = oog_table[(i + i1) % NANGLES];
936
                else
937
                    oog_table[i] = oog_table[(i + NANGLES - i2) % NANGLES];
938
            }
939
        initialized = 1;
940
    }
941
    i = (int)uv2ang(u, v); /* look up hue angle */
942
    return (oog_table[i]);
943
}
944

945
#undef uv2ang
946
#undef NANGLES
947

948
#if !LOGLUV_PUBLIC
949
static
950
#endif
951
    int
952
    uv_encode(double u, double v, int em) /* encode (u',v') coordinates */
953
{
954
    register int vi, ui;
955

956
    /* check for NaN */
957
    if (u != u || v != v)
958
    {
959
        u = U_NEU;
960
        v = V_NEU;
961
    }
962

963
    if (v < UV_VSTART)
964
        return oog_encode(u, v);
965
    vi = tiff_itrunc((v - UV_VSTART) * (1. / UV_SQSIZ), em);
966
    if (vi >= UV_NVS)
967
        return oog_encode(u, v);
968
    if (u < uv_row[vi].ustart)
969
        return oog_encode(u, v);
970
    ui = tiff_itrunc((u - uv_row[vi].ustart) * (1. / UV_SQSIZ), em);
971
    if (ui >= uv_row[vi].nus)
972
        return oog_encode(u, v);
973

974
    return (uv_row[vi].ncum + ui);
975
}
976

977
#if !LOGLUV_PUBLIC
978
static
979
#endif
980
    int
981
    uv_decode(double *up, double *vp, int c) /* decode (u',v') index */
982
{
983
    int upper, lower;
984
    register int ui, vi;
985

986
    if (c < 0 || c >= UV_NDIVS)
987
        return (-1);
988
    lower = 0; /* binary search */
989
    upper = UV_NVS;
990
    while (upper - lower > 1)
991
    {
992
        vi = (lower + upper) >> 1;
993
        ui = c - uv_row[vi].ncum;
994
        if (ui > 0)
995
            lower = vi;
996
        else if (ui < 0)
997
            upper = vi;
998
        else
999
        {
1000
            lower = vi;
1001
            break;
1002
        }
1003
    }
1004
    vi = lower;
1005
    ui = c - uv_row[vi].ncum;
1006
    *up = uv_row[vi].ustart + (ui + .5) * UV_SQSIZ;
1007
    *vp = UV_VSTART + (vi + .5) * UV_SQSIZ;
1008
    return (0);
1009
}
1010

1011
#if !LOGLUV_PUBLIC
1012
static
1013
#endif
1014
    void
1015
    LogLuv24toXYZ(uint32_t p, float *XYZ)
1016
{
1017
    int Ce;
1018
    double L, u, v, s, x, y;
1019
    /* decode luminance */
1020
    L = LogL10toY(p >> 14 & 0x3ff);
1021
    if (L <= 0.)
1022
    {
1023
        XYZ[0] = XYZ[1] = XYZ[2] = 0.;
1024
        return;
1025
    }
1026
    /* decode color */
1027
    Ce = p & 0x3fff;
1028
    if (uv_decode(&u, &v, Ce) < 0)
1029
    {
1030
        u = U_NEU;
1031
        v = V_NEU;
1032
    }
1033
    s = 1. / (6. * u - 16. * v + 12.);
1034
    x = 9. * u * s;
1035
    y = 4. * v * s;
1036
    /* convert to XYZ */
1037
    XYZ[0] = (float)(x / y * L);
1038
    XYZ[1] = (float)L;
1039
    XYZ[2] = (float)((1. - x - y) / y * L);
1040
}
1041

1042
#if !LOGLUV_PUBLIC
1043
static
1044
#endif
1045
    uint32_t
1046
    LogLuv24fromXYZ(float *XYZ, int em)
1047
{
1048
    int Le, Ce;
1049
    double u, v, s;
1050
    /* encode luminance */
1051
    Le = LogL10fromY(XYZ[1], em);
1052
    /* encode color */
1053
    s = XYZ[0] + 15. * XYZ[1] + 3. * XYZ[2];
1054
    if (!Le || s <= 0.)
1055
    {
1056
        u = U_NEU;
1057
        v = V_NEU;
1058
    }
1059
    else
1060
    {
1061
        u = 4. * XYZ[0] / s;
1062
        v = 9. * XYZ[1] / s;
1063
    }
1064
    Ce = uv_encode(u, v, em);
1065
    if (Ce < 0) /* never happens */
1066
        Ce = uv_encode(U_NEU, V_NEU, SGILOGENCODE_NODITHER);
1067
    /* combine encodings */
1068
    return (Le << 14 | Ce);
1069
}
1070

1071
static void Luv24toXYZ(LogLuvState *sp, uint8_t *op, tmsize_t n)
1072
{
1073
    uint32_t *luv = (uint32_t *)sp->tbuf;
1074
    float *xyz = (float *)op;
1075

1076
    while (n-- > 0)
1077
    {
1078
        LogLuv24toXYZ(*luv, xyz);
1079
        xyz += 3;
1080
        luv++;
1081
    }
1082
}
1083

1084
static void Luv24toLuv48(LogLuvState *sp, uint8_t *op, tmsize_t n)
1085
{
1086
    uint32_t *luv = (uint32_t *)sp->tbuf;
1087
    int16_t *luv3 = (int16_t *)op;
1088

1089
    while (n-- > 0)
1090
    {
1091
        double u, v;
1092

1093
        *luv3++ = (int16_t)((*luv >> 12 & 0xffd) + 13314);
1094
        if (uv_decode(&u, &v, *luv & 0x3fff) < 0)
1095
        {
1096
            u = U_NEU;
1097
            v = V_NEU;
1098
        }
1099
        *luv3++ = (int16_t)(u * (1L << 15));
1100
        *luv3++ = (int16_t)(v * (1L << 15));
1101
        luv++;
1102
    }
1103
}
1104

1105
static void Luv24toRGB(LogLuvState *sp, uint8_t *op, tmsize_t n)
1106
{
1107
    uint32_t *luv = (uint32_t *)sp->tbuf;
1108
    uint8_t *rgb = (uint8_t *)op;
1109

1110
    while (n-- > 0)
1111
    {
1112
        float xyz[3];
1113

1114
        LogLuv24toXYZ(*luv++, xyz);
1115
        XYZtoRGB24(xyz, rgb);
1116
        rgb += 3;
1117
    }
1118
}
1119

1120
static void Luv24fromXYZ(LogLuvState *sp, uint8_t *op, tmsize_t n)
1121
{
1122
    uint32_t *luv = (uint32_t *)sp->tbuf;
1123
    float *xyz = (float *)op;
1124

1125
    while (n-- > 0)
1126
    {
1127
        *luv++ = LogLuv24fromXYZ(xyz, sp->encode_meth);
1128
        xyz += 3;
1129
    }
1130
}
1131

1132
static void Luv24fromLuv48(LogLuvState *sp, uint8_t *op, tmsize_t n)
1133
{
1134
    uint32_t *luv = (uint32_t *)sp->tbuf;
1135
    int16_t *luv3 = (int16_t *)op;
1136

1137
    while (n-- > 0)
1138
    {
1139
        int Le, Ce;
1140

1141
        if (luv3[0] <= 0)
1142
            Le = 0;
1143
        else if (luv3[0] >= (1 << 12) + 3314)
1144
            Le = (1 << 10) - 1;
1145
        else if (sp->encode_meth == SGILOGENCODE_NODITHER)
1146
            Le = (luv3[0] - 3314) >> 2;
1147
        else
1148
            Le = tiff_itrunc(.25 * (luv3[0] - 3314.), sp->encode_meth);
1149

1150
        Ce = uv_encode((luv3[1] + .5) / (1 << 15), (luv3[2] + .5) / (1 << 15),
1151
                       sp->encode_meth);
1152
        if (Ce < 0) /* never happens */
1153
            Ce = uv_encode(U_NEU, V_NEU, SGILOGENCODE_NODITHER);
1154
        *luv++ = (uint32_t)Le << 14 | Ce;
1155
        luv3 += 3;
1156
    }
1157
}
1158

1159
#if !LOGLUV_PUBLIC
1160
static
1161
#endif
1162
    void
1163
    LogLuv32toXYZ(uint32_t p, float *XYZ)
1164
{
1165
    double L, u, v, s, x, y;
1166
    /* decode luminance */
1167
    L = LogL16toY((int)p >> 16);
1168
    if (L <= 0.)
1169
    {
1170
        XYZ[0] = XYZ[1] = XYZ[2] = 0.;
1171
        return;
1172
    }
1173
    /* decode color */
1174
    u = 1. / UVSCALE * ((p >> 8 & 0xff) + .5);
1175
    v = 1. / UVSCALE * ((p & 0xff) + .5);
1176
    s = 1. / (6. * u - 16. * v + 12.);
1177
    x = 9. * u * s;
1178
    y = 4. * v * s;
1179
    /* convert to XYZ */
1180
    XYZ[0] = (float)(x / y * L);
1181
    XYZ[1] = (float)L;
1182
    XYZ[2] = (float)((1. - x - y) / y * L);
1183
}
1184

1185
#if !LOGLUV_PUBLIC
1186
static
1187
#endif
1188
    uint32_t
1189
    LogLuv32fromXYZ(float *XYZ, int em)
1190
{
1191
    unsigned int Le, ue, ve;
1192
    double u, v, s;
1193
    /* encode luminance */
1194
    Le = (unsigned int)LogL16fromY(XYZ[1], em);
1195
    /* encode color */
1196
    s = XYZ[0] + 15. * XYZ[1] + 3. * XYZ[2];
1197
    if (!Le || s <= 0.)
1198
    {
1199
        u = U_NEU;
1200
        v = V_NEU;
1201
    }
1202
    else
1203
    {
1204
        u = 4. * XYZ[0] / s;
1205
        v = 9. * XYZ[1] / s;
1206
    }
1207
    if (u <= 0.)
1208
        ue = 0;
1209
    else
1210
        ue = tiff_itrunc(UVSCALE * u, em);
1211
    if (ue > 255)
1212
        ue = 255;
1213
    if (v <= 0.)
1214
        ve = 0;
1215
    else
1216
        ve = tiff_itrunc(UVSCALE * v, em);
1217
    if (ve > 255)
1218
        ve = 255;
1219
    /* combine encodings */
1220
    return (Le << 16 | ue << 8 | ve);
1221
}
1222

1223
static void Luv32toXYZ(LogLuvState *sp, uint8_t *op, tmsize_t n)
1224
{
1225
    uint32_t *luv = (uint32_t *)sp->tbuf;
1226
    float *xyz = (float *)op;
1227

1228
    while (n-- > 0)
1229
    {
1230
        LogLuv32toXYZ(*luv++, xyz);
1231
        xyz += 3;
1232
    }
1233
}
1234

1235
static void Luv32toLuv48(LogLuvState *sp, uint8_t *op, tmsize_t n)
1236
{
1237
    uint32_t *luv = (uint32_t *)sp->tbuf;
1238
    int16_t *luv3 = (int16_t *)op;
1239

1240
    while (n-- > 0)
1241
    {
1242
        double u, v;
1243

1244
        *luv3++ = (int16_t)(*luv >> 16);
1245
        u = 1. / UVSCALE * ((*luv >> 8 & 0xff) + .5);
1246
        v = 1. / UVSCALE * ((*luv & 0xff) + .5);
1247
        *luv3++ = (int16_t)(u * (1L << 15));
1248
        *luv3++ = (int16_t)(v * (1L << 15));
1249
        luv++;
1250
    }
1251
}
1252

1253
static void Luv32toRGB(LogLuvState *sp, uint8_t *op, tmsize_t n)
1254
{
1255
    uint32_t *luv = (uint32_t *)sp->tbuf;
1256
    uint8_t *rgb = (uint8_t *)op;
1257

1258
    while (n-- > 0)
1259
    {
1260
        float xyz[3];
1261

1262
        LogLuv32toXYZ(*luv++, xyz);
1263
        XYZtoRGB24(xyz, rgb);
1264
        rgb += 3;
1265
    }
1266
}
1267

1268
static void Luv32fromXYZ(LogLuvState *sp, uint8_t *op, tmsize_t n)
1269
{
1270
    uint32_t *luv = (uint32_t *)sp->tbuf;
1271
    float *xyz = (float *)op;
1272

1273
    while (n-- > 0)
1274
    {
1275
        *luv++ = LogLuv32fromXYZ(xyz, sp->encode_meth);
1276
        xyz += 3;
1277
    }
1278
}
1279

1280
static void Luv32fromLuv48(LogLuvState *sp, uint8_t *op, tmsize_t n)
1281
{
1282
    uint32_t *luv = (uint32_t *)sp->tbuf;
1283
    int16_t *luv3 = (int16_t *)op;
1284

1285
    if (sp->encode_meth == SGILOGENCODE_NODITHER)
1286
    {
1287
        while (n-- > 0)
1288
        {
1289
            *luv++ = (uint32_t)luv3[0] << 16 |
1290
                     (luv3[1] * (uint32_t)(UVSCALE + .5) >> 7 & 0xff00) |
1291
                     (luv3[2] * (uint32_t)(UVSCALE + .5) >> 15 & 0xff);
1292
            luv3 += 3;
1293
        }
1294
        return;
1295
    }
1296
    while (n-- > 0)
1297
    {
1298
        *luv++ =
1299
            (uint32_t)luv3[0] << 16 |
1300
            (tiff_itrunc(luv3[1] * (UVSCALE / (1 << 15)), sp->encode_meth)
1301
                 << 8 &
1302
             0xff00) |
1303
            (tiff_itrunc(luv3[2] * (UVSCALE / (1 << 15)), sp->encode_meth) &
1304
             0xff);
1305
        luv3 += 3;
1306
    }
1307
}
1308

1309
static void _logLuvNop(LogLuvState *sp, uint8_t *op, tmsize_t n)
1310
{
1311
    (void)sp;
1312
    (void)op;
1313
    (void)n;
1314
}
1315

1316
static int LogL16GuessDataFmt(TIFFDirectory *td)
1317
{
1318
#define PACK(s, b, f) (((b) << 6) | ((s) << 3) | (f))
1319
    switch (
1320
        PACK(td->td_samplesperpixel, td->td_bitspersample, td->td_sampleformat))
1321
    {
1322
        case PACK(1, 32, SAMPLEFORMAT_IEEEFP):
1323
            return (SGILOGDATAFMT_FLOAT);
1324
        case PACK(1, 16, SAMPLEFORMAT_VOID):
1325
        case PACK(1, 16, SAMPLEFORMAT_INT):
1326
        case PACK(1, 16, SAMPLEFORMAT_UINT):
1327
            return (SGILOGDATAFMT_16BIT);
1328
        case PACK(1, 8, SAMPLEFORMAT_VOID):
1329
        case PACK(1, 8, SAMPLEFORMAT_UINT):
1330
            return (SGILOGDATAFMT_8BIT);
1331
    }
1332
#undef PACK
1333
    return (SGILOGDATAFMT_UNKNOWN);
1334
}
1335

1336
static tmsize_t multiply_ms(tmsize_t m1, tmsize_t m2)
1337
{
1338
    return _TIFFMultiplySSize(NULL, m1, m2, NULL);
1339
}
1340

1341
static int LogL16InitState(TIFF *tif)
1342
{
1343
    static const char module[] = "LogL16InitState";
1344
    TIFFDirectory *td = &tif->tif_dir;
1345
    LogLuvState *sp = DecoderState(tif);
1346

1347
    assert(sp != NULL);
1348
    assert(td->td_photometric == PHOTOMETRIC_LOGL);
1349

1350
    if (td->td_samplesperpixel != 1)
1351
    {
1352
        TIFFErrorExtR(tif, module,
1353
                      "Sorry, can not handle LogL image with %s=%" PRIu16,
1354
                      "Samples/pixel", td->td_samplesperpixel);
1355
        return 0;
1356
    }
1357

1358
    /* for some reason, we can't do this in TIFFInitLogL16 */
1359
    if (sp->user_datafmt == SGILOGDATAFMT_UNKNOWN)
1360
        sp->user_datafmt = LogL16GuessDataFmt(td);
1361
    switch (sp->user_datafmt)
1362
    {
1363
        case SGILOGDATAFMT_FLOAT:
1364
            sp->pixel_size = sizeof(float);
1365
            break;
1366
        case SGILOGDATAFMT_16BIT:
1367
            sp->pixel_size = sizeof(int16_t);
1368
            break;
1369
        case SGILOGDATAFMT_8BIT:
1370
            sp->pixel_size = sizeof(uint8_t);
1371
            break;
1372
        default:
1373
            TIFFErrorExtR(tif, module,
1374
                          "No support for converting user data format to LogL");
1375
            return (0);
1376
    }
1377
    if (isTiled(tif))
1378
        sp->tbuflen = multiply_ms(td->td_tilewidth, td->td_tilelength);
1379
    else if (td->td_rowsperstrip < td->td_imagelength)
1380
        sp->tbuflen = multiply_ms(td->td_imagewidth, td->td_rowsperstrip);
1381
    else
1382
        sp->tbuflen = multiply_ms(td->td_imagewidth, td->td_imagelength);
1383
    if (multiply_ms(sp->tbuflen, sizeof(int16_t)) == 0 ||
1384
        (sp->tbuf = (uint8_t *)_TIFFmallocExt(
1385
             tif, sp->tbuflen * sizeof(int16_t))) == NULL)
1386
    {
1387
        TIFFErrorExtR(tif, module, "No space for SGILog translation buffer");
1388
        return (0);
1389
    }
1390
    return (1);
1391
}
1392

1393
static int LogLuvGuessDataFmt(TIFFDirectory *td)
1394
{
1395
    int guess;
1396

1397
    /*
1398
     * If the user didn't tell us their datafmt,
1399
     * take our best guess from the bitspersample.
1400
     */
1401
#define PACK(a, b) (((a) << 3) | (b))
1402
    switch (PACK(td->td_bitspersample, td->td_sampleformat))
1403
    {
1404
        case PACK(32, SAMPLEFORMAT_IEEEFP):
1405
            guess = SGILOGDATAFMT_FLOAT;
1406
            break;
1407
        case PACK(32, SAMPLEFORMAT_VOID):
1408
        case PACK(32, SAMPLEFORMAT_UINT):
1409
        case PACK(32, SAMPLEFORMAT_INT):
1410
            guess = SGILOGDATAFMT_RAW;
1411
            break;
1412
        case PACK(16, SAMPLEFORMAT_VOID):
1413
        case PACK(16, SAMPLEFORMAT_INT):
1414
        case PACK(16, SAMPLEFORMAT_UINT):
1415
            guess = SGILOGDATAFMT_16BIT;
1416
            break;
1417
        case PACK(8, SAMPLEFORMAT_VOID):
1418
        case PACK(8, SAMPLEFORMAT_UINT):
1419
            guess = SGILOGDATAFMT_8BIT;
1420
            break;
1421
        default:
1422
            guess = SGILOGDATAFMT_UNKNOWN;
1423
            break;
1424
#undef PACK
1425
    }
1426
    /*
1427
     * Double-check samples per pixel.
1428
     */
1429
    switch (td->td_samplesperpixel)
1430
    {
1431
        case 1:
1432
            if (guess != SGILOGDATAFMT_RAW)
1433
                guess = SGILOGDATAFMT_UNKNOWN;
1434
            break;
1435
        case 3:
1436
            if (guess == SGILOGDATAFMT_RAW)
1437
                guess = SGILOGDATAFMT_UNKNOWN;
1438
            break;
1439
        default:
1440
            guess = SGILOGDATAFMT_UNKNOWN;
1441
            break;
1442
    }
1443
    return (guess);
1444
}
1445

1446
static int LogLuvInitState(TIFF *tif)
1447
{
1448
    static const char module[] = "LogLuvInitState";
1449
    TIFFDirectory *td = &tif->tif_dir;
1450
    LogLuvState *sp = DecoderState(tif);
1451

1452
    assert(sp != NULL);
1453
    assert(td->td_photometric == PHOTOMETRIC_LOGLUV);
1454

1455
    /* for some reason, we can't do this in TIFFInitLogLuv */
1456
    if (td->td_planarconfig != PLANARCONFIG_CONTIG)
1457
    {
1458
        TIFFErrorExtR(tif, module,
1459
                      "SGILog compression cannot handle non-contiguous data");
1460
        return (0);
1461
    }
1462
    if (sp->user_datafmt == SGILOGDATAFMT_UNKNOWN)
1463
        sp->user_datafmt = LogLuvGuessDataFmt(td);
1464
    switch (sp->user_datafmt)
1465
    {
1466
        case SGILOGDATAFMT_FLOAT:
1467
            sp->pixel_size = 3 * sizeof(float);
1468
            break;
1469
        case SGILOGDATAFMT_16BIT:
1470
            sp->pixel_size = 3 * sizeof(int16_t);
1471
            break;
1472
        case SGILOGDATAFMT_RAW:
1473
            sp->pixel_size = sizeof(uint32_t);
1474
            break;
1475
        case SGILOGDATAFMT_8BIT:
1476
            sp->pixel_size = 3 * sizeof(uint8_t);
1477
            break;
1478
        default:
1479
            TIFFErrorExtR(
1480
                tif, module,
1481
                "No support for converting user data format to LogLuv");
1482
            return (0);
1483
    }
1484
    if (isTiled(tif))
1485
        sp->tbuflen = multiply_ms(td->td_tilewidth, td->td_tilelength);
1486
    else if (td->td_rowsperstrip < td->td_imagelength)
1487
        sp->tbuflen = multiply_ms(td->td_imagewidth, td->td_rowsperstrip);
1488
    else
1489
        sp->tbuflen = multiply_ms(td->td_imagewidth, td->td_imagelength);
1490
    if (multiply_ms(sp->tbuflen, sizeof(uint32_t)) == 0 ||
1491
        (sp->tbuf = (uint8_t *)_TIFFmallocExt(
1492
             tif, sp->tbuflen * sizeof(uint32_t))) == NULL)
1493
    {
1494
        TIFFErrorExtR(tif, module, "No space for SGILog translation buffer");
1495
        return (0);
1496
    }
1497
    return (1);
1498
}
1499

1500
static int LogLuvFixupTags(TIFF *tif)
1501
{
1502
    (void)tif;
1503
    return (1);
1504
}
1505

1506
static int LogLuvSetupDecode(TIFF *tif)
1507
{
1508
    static const char module[] = "LogLuvSetupDecode";
1509
    LogLuvState *sp = DecoderState(tif);
1510
    TIFFDirectory *td = &tif->tif_dir;
1511

1512
    tif->tif_postdecode = _TIFFNoPostDecode;
1513
    switch (td->td_photometric)
1514
    {
1515
        case PHOTOMETRIC_LOGLUV:
1516
            if (!LogLuvInitState(tif))
1517
                break;
1518
            if (td->td_compression == COMPRESSION_SGILOG24)
1519
            {
1520
                tif->tif_decoderow = LogLuvDecode24;
1521
                switch (sp->user_datafmt)
1522
                {
1523
                    case SGILOGDATAFMT_FLOAT:
1524
                        sp->tfunc = Luv24toXYZ;
1525
                        break;
1526
                    case SGILOGDATAFMT_16BIT:
1527
                        sp->tfunc = Luv24toLuv48;
1528
                        break;
1529
                    case SGILOGDATAFMT_8BIT:
1530
                        sp->tfunc = Luv24toRGB;
1531
                        break;
1532
                }
1533
            }
1534
            else
1535
            {
1536
                tif->tif_decoderow = LogLuvDecode32;
1537
                switch (sp->user_datafmt)
1538
                {
1539
                    case SGILOGDATAFMT_FLOAT:
1540
                        sp->tfunc = Luv32toXYZ;
1541
                        break;
1542
                    case SGILOGDATAFMT_16BIT:
1543
                        sp->tfunc = Luv32toLuv48;
1544
                        break;
1545
                    case SGILOGDATAFMT_8BIT:
1546
                        sp->tfunc = Luv32toRGB;
1547
                        break;
1548
                }
1549
            }
1550
            return (1);
1551
        case PHOTOMETRIC_LOGL:
1552
            if (!LogL16InitState(tif))
1553
                break;
1554
            tif->tif_decoderow = LogL16Decode;
1555
            switch (sp->user_datafmt)
1556
            {
1557
                case SGILOGDATAFMT_FLOAT:
1558
                    sp->tfunc = L16toY;
1559
                    break;
1560
                case SGILOGDATAFMT_8BIT:
1561
                    sp->tfunc = L16toGry;
1562
                    break;
1563
            }
1564
            return (1);
1565
        default:
1566
            TIFFErrorExtR(tif, module,
1567
                          "Inappropriate photometric interpretation %" PRIu16
1568
                          " for SGILog compression; %s",
1569
                          td->td_photometric, "must be either LogLUV or LogL");
1570
            break;
1571
    }
1572
    return (0);
1573
}
1574

1575
static int LogLuvSetupEncode(TIFF *tif)
1576
{
1577
    static const char module[] = "LogLuvSetupEncode";
1578
    LogLuvState *sp = EncoderState(tif);
1579
    TIFFDirectory *td = &tif->tif_dir;
1580

1581
    switch (td->td_photometric)
1582
    {
1583
        case PHOTOMETRIC_LOGLUV:
1584
            if (!LogLuvInitState(tif))
1585
                return (0);
1586
            if (td->td_compression == COMPRESSION_SGILOG24)
1587
            {
1588
                tif->tif_encoderow = LogLuvEncode24;
1589
                switch (sp->user_datafmt)
1590
                {
1591
                    case SGILOGDATAFMT_FLOAT:
1592
                        sp->tfunc = Luv24fromXYZ;
1593
                        break;
1594
                    case SGILOGDATAFMT_16BIT:
1595
                        sp->tfunc = Luv24fromLuv48;
1596
                        break;
1597
                    case SGILOGDATAFMT_RAW:
1598
                        break;
1599
                    default:
1600
                        goto notsupported;
1601
                }
1602
            }
1603
            else
1604
            {
1605
                tif->tif_encoderow = LogLuvEncode32;
1606
                switch (sp->user_datafmt)
1607
                {
1608
                    case SGILOGDATAFMT_FLOAT:
1609
                        sp->tfunc = Luv32fromXYZ;
1610
                        break;
1611
                    case SGILOGDATAFMT_16BIT:
1612
                        sp->tfunc = Luv32fromLuv48;
1613
                        break;
1614
                    case SGILOGDATAFMT_RAW:
1615
                        break;
1616
                    default:
1617
                        goto notsupported;
1618
                }
1619
            }
1620
            break;
1621
        case PHOTOMETRIC_LOGL:
1622
            if (!LogL16InitState(tif))
1623
                return (0);
1624
            tif->tif_encoderow = LogL16Encode;
1625
            switch (sp->user_datafmt)
1626
            {
1627
                case SGILOGDATAFMT_FLOAT:
1628
                    sp->tfunc = L16fromY;
1629
                    break;
1630
                case SGILOGDATAFMT_16BIT:
1631
                    break;
1632
                default:
1633
                    goto notsupported;
1634
            }
1635
            break;
1636
        default:
1637
            TIFFErrorExtR(tif, module,
1638
                          "Inappropriate photometric interpretation %" PRIu16
1639
                          " for SGILog compression; %s",
1640
                          td->td_photometric, "must be either LogLUV or LogL");
1641
            return (0);
1642
    }
1643
    sp->encoder_state = 1;
1644
    return (1);
1645
notsupported:
1646
    TIFFErrorExtR(tif, module,
1647
                  "SGILog compression supported only for %s, or raw data",
1648
                  td->td_photometric == PHOTOMETRIC_LOGL ? "Y, L" : "XYZ, Luv");
1649
    return (0);
1650
}
1651

1652
static void LogLuvClose(TIFF *tif)
1653
{
1654
    LogLuvState *sp = (LogLuvState *)tif->tif_data;
1655
    TIFFDirectory *td = &tif->tif_dir;
1656

1657
    assert(sp != 0);
1658
    /*
1659
     * For consistency, we always want to write out the same
1660
     * bitspersample and sampleformat for our TIFF file,
1661
     * regardless of the data format being used by the application.
1662
     * Since this routine is called after tags have been set but
1663
     * before they have been recorded in the file, we reset them here.
1664
     * Note: this is really a nasty approach. See PixarLogClose
1665
     */
1666
    if (sp->encoder_state)
1667
    {
1668
        /* See PixarLogClose. Might avoid issues with tags whose size depends
1669
         * on those below, but not completely sure this is enough. */
1670
        td->td_samplesperpixel =
1671
            (td->td_photometric == PHOTOMETRIC_LOGL) ? 1 : 3;
1672
        td->td_bitspersample = 16;
1673
        td->td_sampleformat = SAMPLEFORMAT_INT;
1674
    }
1675
}
1676

1677
static void LogLuvCleanup(TIFF *tif)
1678
{
1679
    LogLuvState *sp = (LogLuvState *)tif->tif_data;
1680

1681
    assert(sp != 0);
1682

1683
    tif->tif_tagmethods.vgetfield = sp->vgetparent;
1684
    tif->tif_tagmethods.vsetfield = sp->vsetparent;
1685

1686
    if (sp->tbuf)
1687
        _TIFFfreeExt(tif, sp->tbuf);
1688
    _TIFFfreeExt(tif, sp);
1689
    tif->tif_data = NULL;
1690

1691
    _TIFFSetDefaultCompressionState(tif);
1692
}
1693

1694
static int LogLuvVSetField(TIFF *tif, uint32_t tag, va_list ap)
1695
{
1696
    static const char module[] = "LogLuvVSetField";
1697
    LogLuvState *sp = DecoderState(tif);
1698
    int bps, fmt;
1699

1700
    switch (tag)
1701
    {
1702
        case TIFFTAG_SGILOGDATAFMT:
1703
            sp->user_datafmt = (int)va_arg(ap, int);
1704
            /*
1705
             * Tweak the TIFF header so that the rest of libtiff knows what
1706
             * size of data will be passed between app and library, and
1707
             * assume that the app knows what it is doing and is not
1708
             * confused by these header manipulations...
1709
             */
1710
            switch (sp->user_datafmt)
1711
            {
1712
                case SGILOGDATAFMT_FLOAT:
1713
                    bps = 32;
1714
                    fmt = SAMPLEFORMAT_IEEEFP;
1715
                    break;
1716
                case SGILOGDATAFMT_16BIT:
1717
                    bps = 16;
1718
                    fmt = SAMPLEFORMAT_INT;
1719
                    break;
1720
                case SGILOGDATAFMT_RAW:
1721
                    bps = 32;
1722
                    fmt = SAMPLEFORMAT_UINT;
1723
                    TIFFSetField(tif, TIFFTAG_SAMPLESPERPIXEL, 1);
1724
                    break;
1725
                case SGILOGDATAFMT_8BIT:
1726
                    bps = 8;
1727
                    fmt = SAMPLEFORMAT_UINT;
1728
                    break;
1729
                default:
1730
                    TIFFErrorExtR(
1731
                        tif, tif->tif_name,
1732
                        "Unknown data format %d for LogLuv compression",
1733
                        sp->user_datafmt);
1734
                    return (0);
1735
            }
1736
            TIFFSetField(tif, TIFFTAG_BITSPERSAMPLE, bps);
1737
            TIFFSetField(tif, TIFFTAG_SAMPLEFORMAT, fmt);
1738
            /*
1739
             * Must recalculate sizes should bits/sample change.
1740
             */
1741
            tif->tif_tilesize = isTiled(tif) ? TIFFTileSize(tif) : (tmsize_t)-1;
1742
            tif->tif_scanlinesize = TIFFScanlineSize(tif);
1743
            return (1);
1744
        case TIFFTAG_SGILOGENCODE:
1745
            sp->encode_meth = (int)va_arg(ap, int);
1746
            if (sp->encode_meth != SGILOGENCODE_NODITHER &&
1747
                sp->encode_meth != SGILOGENCODE_RANDITHER)
1748
            {
1749
                TIFFErrorExtR(tif, module,
1750
                              "Unknown encoding %d for LogLuv compression",
1751
                              sp->encode_meth);
1752
                return (0);
1753
            }
1754
            return (1);
1755
        default:
1756
            return (*sp->vsetparent)(tif, tag, ap);
1757
    }
1758
}
1759

1760
static int LogLuvVGetField(TIFF *tif, uint32_t tag, va_list ap)
1761
{
1762
    LogLuvState *sp = (LogLuvState *)tif->tif_data;
1763

1764
    switch (tag)
1765
    {
1766
        case TIFFTAG_SGILOGDATAFMT:
1767
            *va_arg(ap, int *) = sp->user_datafmt;
1768
            return (1);
1769
        default:
1770
            return (*sp->vgetparent)(tif, tag, ap);
1771
    }
1772
}
1773

1774
static const TIFFField LogLuvFields[] = {
1775
    {TIFFTAG_SGILOGDATAFMT, 0, 0, TIFF_SHORT, 0, TIFF_SETGET_INT,
1776
     TIFF_SETGET_UNDEFINED, FIELD_PSEUDO, TRUE, FALSE, "SGILogDataFmt", NULL},
1777
    {TIFFTAG_SGILOGENCODE, 0, 0, TIFF_SHORT, 0, TIFF_SETGET_INT,
1778
     TIFF_SETGET_UNDEFINED, FIELD_PSEUDO, TRUE, FALSE, "SGILogEncode", NULL}};
1779

1780
int TIFFInitSGILog(TIFF *tif, int scheme)
1781
{
1782
    static const char module[] = "TIFFInitSGILog";
1783
    LogLuvState *sp;
1784

1785
    assert(scheme == COMPRESSION_SGILOG24 || scheme == COMPRESSION_SGILOG);
1786

1787
    /*
1788
     * Merge codec-specific tag information.
1789
     */
1790
    if (!_TIFFMergeFields(tif, LogLuvFields, TIFFArrayCount(LogLuvFields)))
1791
    {
1792
        TIFFErrorExtR(tif, module, "Merging SGILog codec-specific tags failed");
1793
        return 0;
1794
    }
1795

1796
    /*
1797
     * Allocate state block so tag methods have storage to record values.
1798
     */
1799
    tif->tif_data = (uint8_t *)_TIFFmallocExt(tif, sizeof(LogLuvState));
1800
    if (tif->tif_data == NULL)
1801
        goto bad;
1802
    sp = (LogLuvState *)tif->tif_data;
1803
    _TIFFmemset((void *)sp, 0, sizeof(*sp));
1804
    sp->user_datafmt = SGILOGDATAFMT_UNKNOWN;
1805
    sp->encode_meth = (scheme == COMPRESSION_SGILOG24) ? SGILOGENCODE_RANDITHER
1806
                                                       : SGILOGENCODE_NODITHER;
1807
    sp->tfunc = _logLuvNop;
1808

1809
    /*
1810
     * Install codec methods.
1811
     * NB: tif_decoderow & tif_encoderow are filled
1812
     *     in at setup time.
1813
     */
1814
    tif->tif_fixuptags = LogLuvFixupTags;
1815
    tif->tif_setupdecode = LogLuvSetupDecode;
1816
    tif->tif_decodestrip = LogLuvDecodeStrip;
1817
    tif->tif_decodetile = LogLuvDecodeTile;
1818
    tif->tif_setupencode = LogLuvSetupEncode;
1819
    tif->tif_encodestrip = LogLuvEncodeStrip;
1820
    tif->tif_encodetile = LogLuvEncodeTile;
1821
    tif->tif_close = LogLuvClose;
1822
    tif->tif_cleanup = LogLuvCleanup;
1823

1824
    /*
1825
     * Override parent get/set field methods.
1826
     */
1827
    sp->vgetparent = tif->tif_tagmethods.vgetfield;
1828
    tif->tif_tagmethods.vgetfield = LogLuvVGetField; /* hook for codec tags */
1829
    sp->vsetparent = tif->tif_tagmethods.vsetfield;
1830
    tif->tif_tagmethods.vsetfield = LogLuvVSetField; /* hook for codec tags */
1831

1832
    return (1);
1833
bad:
1834
    TIFFErrorExtR(tif, module, "%s: No space for LogLuv state block",
1835
                  tif->tif_name);
1836
    return (0);
1837
}
1838
#endif /* LOGLUV_SUPPORT */
1839