libtiff/tif_luv.c

   1 /* $Id: tif_luv.c,v 1.49 2017-07-24 12:47:30 erouault Exp $ */
   2
   3 /*
   4  * Copyright (c) 1997 Greg Ward Larson
   5  * Copyright (c) 1997 Silicon Graphics, Inc.
   6  *
   7  * Permission to use, copy, modify, distribute, and sell this software and
   8  * its documentation for any purpose is hereby granted without fee, provided
   9  * that (i) the above copyright notices and this permission notice appear in
  10  * all copies of the software and related documentation, and (ii) the names of
  11  * Sam Leffler, Greg Larson and Silicon Graphics may not be used in any
  12  * advertising or publicity relating to the software without the specific,
  13  * prior written permission of Sam Leffler, Greg Larson and Silicon Graphics.
  14  *
  15  * THE SOFTWARE IS PROVIDED "AS-IS" AND WITHOUT WARRANTY OF ANY KIND,
  16  * EXPRESS, IMPLIED OR OTHERWISE, INCLUDING WITHOUT LIMITATION, ANY
  17  * WARRANTY OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE.
  18  *
  19  * IN NO EVENT SHALL SAM LEFFLER, GREG LARSON OR SILICON GRAPHICS BE LIABLE
  20  * FOR ANY SPECIAL, INCIDENTAL, INDIRECT OR CONSEQUENTIAL DAMAGES OF ANY KIND,
  21  * OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
  22  * WHETHER OR NOT ADVISED OF THE POSSIBILITY OF DAMAGE, AND ON ANY THEORY OF
  23  * LIABILITY, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
  24  * OF THIS SOFTWARE.
  25  */
  26
  27 #include "tiffiop.h"
  28 #ifdef LOGLUV_SUPPORT
  29
  30 /*
  31  * TIFF Library.
  32  * LogLuv compression support for high dynamic range images.
  33  *
  34  * Contributed by Greg Larson.
  35  *
  36  * LogLuv image support uses the TIFF library to store 16 or 10-bit
  37  * log luminance values with 8 bits each of u and v or a 14-bit index.
  38  *
  39  * The codec can take as input and produce as output 32-bit IEEE float values
  40  * as well as 16-bit integer values.  A 16-bit luminance is interpreted
  41  * as a sign bit followed by a 15-bit integer that is converted
  42  * to and from a linear magnitude using the transformation:
  43  *
  44  *      L = 2^( (Le+.5)/256 - 64 )              # real from 15-bit
  45  *
  46  *      Le = floor( 256*(log2(L) + 64) )        # 15-bit from real
  47  *
  48  * The actual conversion to world luminance units in candelas per sq. meter
  49  * requires an additional multiplier, which is stored in the TIFFTAG_STONITS.
  50  * This value is usually set such that a reasonable exposure comes from
  51  * clamping decoded luminances above 1 to 1 in the displayed image.
  52  *
  53  * The 16-bit values for u and v may be converted to real values by dividing
  54  * each by 32768.  (This allows for negative values, which aren't useful as
  55  * far as we know, but are left in case of future improvements in human
  56  * color vision.)
  57  *
  58  * Conversion from (u,v), which is actually the CIE (u',v') system for
  59  * you color scientists, is accomplished by the following transformation:
  60  *
  61  *      u = 4*x / (-2*x + 12*y + 3)
  62  *      v = 9*y / (-2*x + 12*y + 3)
  63  *
  64  *      x = 9*u / (6*u - 16*v + 12)
  65  *      y = 4*v / (6*u - 16*v + 12)
  66  *
  67  * This process is greatly simplified by passing 32-bit IEEE floats
  68  * for each of three CIE XYZ coordinates.  The codec then takes care
  69  * of conversion to and from LogLuv, though the application is still
  70  * responsible for interpreting the TIFFTAG_STONITS calibration factor.
  71  *
  72  * By definition, a CIE XYZ vector of [1 1 1] corresponds to a neutral white
  73  * point of (x,y)=(1/3,1/3).  However, most color systems assume some other
  74  * white point, such as D65, and an absolute color conversion to XYZ then
  75  * to another color space with a different white point may introduce an
  76  * unwanted color cast to the image.  It is often desirable, therefore, to
  77  * perform a white point conversion that maps the input white to [1 1 1]
  78  * in XYZ, then record the original white point using the TIFFTAG_WHITEPOINT
  79  * tag value.  A decoder that demands absolute color calibration may use
  80  * this white point tag to get back the original colors, but usually it
  81  * will be ignored and the new white point will be used instead that
  82  * matches the output color space.
  83  *
  84  * Pixel information is compressed into one of two basic encodings, depending
  85  * on the setting of the compression tag, which is one of COMPRESSION_SGILOG
  86  * or COMPRESSION_SGILOG24.  For COMPRESSION_SGILOG, greyscale data is
  87  * stored as:
  88  *
  89  *       1       15
  90  *      |-+---------------|
  91  *
  92  * COMPRESSION_SGILOG color data is stored as:
  93  *
  94  *       1       15           8        8
  95  *      |-+---------------|--------+--------|
  96  *       S       Le           ue       ve
  97  *
  98  * For the 24-bit COMPRESSION_SGILOG24 color format, the data is stored as:
  99  *
 100  *           10           14
 101  *      |----------|--------------|
 102  *           Le'          Ce
 103  *
 104  * There is no sign bit in the 24-bit case, and the (u,v) chromaticity is
 105  * encoded as an index for optimal color resolution.  The 10 log bits are
 106  * defined by the following conversions:
 107  *
 108  *      L = 2^((Le'+.5)/64 - 12)                # real from 10-bit
 109  *
 110  *      Le' = floor( 64*(log2(L) + 12) )        # 10-bit from real
 111  *
 112  * The 10 bits of the smaller format may be converted into the 15 bits of
 113  * the larger format by multiplying by 4 and adding 13314.  Obviously,
 114  * a smaller range of magnitudes is covered (about 5 orders of magnitude
 115  * instead of 38), and the lack of a sign bit means that negative luminances
 116  * are not allowed.  (Well, they aren't allowed in the real world, either,
 117  * but they are useful for certain types of image processing.)
 118  *
 119  * The desired user format is controlled by the setting the internal
 120  * pseudo tag TIFFTAG_SGILOGDATAFMT to one of:
 121  *  SGILOGDATAFMT_FLOAT       = IEEE 32-bit float XYZ values
 122  *  SGILOGDATAFMT_16BIT       = 16-bit integer encodings of logL, u and v
 123  * Raw data i/o is also possible using:
 124  *  SGILOGDATAFMT_RAW         = 32-bit unsigned integer with encoded pixel
 125  * In addition, the following decoding is provided for ease of display:
 126  *  SGILOGDATAFMT_8BIT        = 8-bit default RGB gamma-corrected values
 127  *
 128  * For grayscale images, we provide the following data formats:
 129  *  SGILOGDATAFMT_FLOAT       = IEEE 32-bit float Y values
 130  *  SGILOGDATAFMT_16BIT       = 16-bit integer w/ encoded luminance
 131  *  SGILOGDATAFMT_8BIT        = 8-bit gray monitor values
 132  *
 133  * Note that the COMPRESSION_SGILOG applies a simple run-length encoding
 134  * scheme by separating the logL, u and v bytes for each row and applying
 135  * a PackBits type of compression.  Since the 24-bit encoding is not
 136  * adaptive, the 32-bit color format takes less space in many cases.
 137  *
 138  * Further control is provided over the conversion from higher-resolution
 139  * formats to final encoded values through the pseudo tag
 140  * TIFFTAG_SGILOGENCODE:
 141  *  SGILOGENCODE_NODITHER     = do not dither encoded values
 142  *  SGILOGENCODE_RANDITHER    = apply random dithering during encoding
 143  *
 144  * The default value of this tag is SGILOGENCODE_NODITHER for
 145  * COMPRESSION_SGILOG to maximize run-length encoding and
 146  * SGILOGENCODE_RANDITHER for COMPRESSION_SGILOG24 to turn
 147  * quantization errors into noise.
 148  */
 149
 150 #include <stdio.h>
 151 #include <stdlib.h>
 152 #include <math.h>
 153
 154 /*
 155  * State block for each open TIFF
 156  * file using LogLuv compression/decompression.
 157  */
 158 typedef struct logLuvState LogLuvState;
 159
 160 struct logLuvState {
 161         int                     encoder_state;  /* 1 if encoder correctly initialized */
 162         int                     user_datafmt;   /* user data format */
 163         int                     encode_meth;    /* encoding method */
 164         int                     pixel_size;     /* bytes per pixel */
 165
 166         uint8*                  tbuf;           /* translation buffer */
 167         tmsize_t                tbuflen;        /* buffer length */
 168         void (*tfunc)(LogLuvState*, uint8*, tmsize_t);
 169
 170         TIFFVSetMethod          vgetparent;     /* super-class method */
 171         TIFFVSetMethod          vsetparent;     /* super-class method */
 172 };
 173
 174 #define DecoderState(tif)       ((LogLuvState*) (tif)->tif_data)
 175 #define EncoderState(tif)       ((LogLuvState*) (tif)->tif_data)
 176
 177 #define SGILOGDATAFMT_UNKNOWN -1
 178
 179 #define MINRUN 4 /* minimum run length */
 180
 181 /*
 182  * Decode a string of 16-bit gray pixels.
 183  */
 184 static int
 185 LogL16Decode(TIFF* tif, uint8* op, tmsize_t occ, uint16 s)
 186 {
 187         static const char module[] = "LogL16Decode";
 188         LogLuvState* sp = DecoderState(tif);
 189         int shft;
 190         tmsize_t i;
 191         tmsize_t npixels;
 192         unsigned char* bp;
 193         int16* tp;
 194         int16 b;
 195         tmsize_t cc;
 196         int rc;
 197
 198         assert(s == 0);
 199         assert(sp != NULL);
 200
 201         npixels = occ / sp->pixel_size;
 202
 203         if (sp->user_datafmt == SGILOGDATAFMT_16BIT)
 204                 tp = (int16*) op;
 205         else {
 206                 if(sp->tbuflen < npixels) {
 207                         TIFFErrorExt(tif->tif_clientdata, module,
 208                                                  "Translation buffer too short");
 209                         return (0);
 210                 }
 211                 tp = (int16*) sp->tbuf;
 212         }
 213         _TIFFmemset((void*) tp, 0, npixels*sizeof (tp[0]));
 214
 215         bp = (unsigned char*) tif->tif_rawcp;
 216         cc = tif->tif_rawcc;
 217         /* get each byte string */
 218         for (shft = 2*8; (shft -= 8) >= 0; ) {
 219                 for (i = 0; i < npixels && cc > 0; ) {
 220                         if (*bp >= 128) {               /* run */
 221                                 if( cc < 2 )
 222                                         break;
 223                                 rc = *bp++ + (2-128);
 224                                 b = (int16)(*bp++ << shft);
 225                                 cc -= 2;
 226                                 while (rc-- && i < npixels)
 227                                         tp[i++] |= b;
 228                         } else {                        /* non-run */
 229                                 rc = *bp++;             /* nul is noop */
 230                                 while (--cc && rc-- && i < npixels)
 231                                         tp[i++] |= (int16)*bp++ << shft;
 232                         }
 233                 }
 234                 if (i != npixels) {
 235 #if defined(__WIN32__) && (defined(_MSC_VER) || defined(__MINGW32__))
 236                         TIFFErrorExt(tif->tif_clientdata, module,
 237                             "Not enough data at row %lu (short %I64d pixels)",
 238                                      (unsigned long) tif->tif_row,
 239                                      (unsigned __int64) (npixels - i));
 240 #else
 241                         TIFFErrorExt(tif->tif_clientdata, module,
 242                             "Not enough data at row %lu (short %llu pixels)",
 243                                      (unsigned long) tif->tif_row,
 244                                      (unsigned long long) (npixels - i));
 245 #endif
 246                         tif->tif_rawcp = (uint8*) bp;
 247                         tif->tif_rawcc = cc;
 248                         return (0);
 249                 }
 250         }
 251         (*sp->tfunc)(sp, op, npixels);
 252         tif->tif_rawcp = (uint8*) bp;
 253         tif->tif_rawcc = cc;
 254         return (1);
 255 }
 256
 257 /*
 258  * Decode a string of 24-bit pixels.
 259  */
 260 static int
 261 LogLuvDecode24(TIFF* tif, uint8* op, tmsize_t occ, uint16 s)
 262 {
 263         static const char module[] = "LogLuvDecode24";
 264         LogLuvState* sp = DecoderState(tif);
 265         tmsize_t cc;
 266         tmsize_t i;
 267         tmsize_t npixels;
 268         unsigned char* bp;
 269         uint32* tp;
 270
 271         assert(s == 0);
 272         assert(sp != NULL);
 273
 274         npixels = occ / sp->pixel_size;
 275
 276         if (sp->user_datafmt == SGILOGDATAFMT_RAW)
 277                 tp = (uint32 *)op;
 278         else {
 279                 if(sp->tbuflen < npixels) {
 280                         TIFFErrorExt(tif->tif_clientdata, module,
 281                                                  "Translation buffer too short");
 282                         return (0);
 283                 }
 284                 tp = (uint32 *) sp->tbuf;
 285         }
 286         /* copy to array of uint32 */
 287         bp = (unsigned char*) tif->tif_rawcp;
 288         cc = tif->tif_rawcc;
 289         for (i = 0; i < npixels && cc >= 3; i++) {
 290                 tp[i] = bp[0] << 16 | bp[1] << 8 | bp[2];
 291                 bp += 3;
 292                 cc -= 3;
 293         }
 294         tif->tif_rawcp = (uint8*) bp;
 295         tif->tif_rawcc = cc;
 296         if (i != npixels) {
 297 #if defined(__WIN32__) && (defined(_MSC_VER) || defined(__MINGW32__))
 298                 TIFFErrorExt(tif->tif_clientdata, module,
 299                         "Not enough data at row %lu (short %I64d pixels)",
 300                              (unsigned long) tif->tif_row,
 301                              (unsigned __int64) (npixels - i));
 302 #else
 303                 TIFFErrorExt(tif->tif_clientdata, module,
 304                         "Not enough data at row %lu (short %llu pixels)",
 305                              (unsigned long) tif->tif_row,
 306                              (unsigned long long) (npixels - i));
 307 #endif
 308                 return (0);
 309         }
 310         (*sp->tfunc)(sp, op, npixels);
 311         return (1);
 312 }
 313
 314 /*
 315  * Decode a string of 32-bit pixels.
 316  */
 317 static int
 318 LogLuvDecode32(TIFF* tif, uint8* op, tmsize_t occ, uint16 s)
 319 {
 320         static const char module[] = "LogLuvDecode32";
 321         LogLuvState* sp;
 322         int shft;
 323         tmsize_t i;
 324         tmsize_t npixels;
 325         unsigned char* bp;
 326         uint32* tp;
 327         uint32 b;
 328         tmsize_t cc;
 329         int rc;
 330
 331         assert(s == 0);
 332         sp = DecoderState(tif);
 333         assert(sp != NULL);
 334
 335         npixels = occ / sp->pixel_size;
 336
 337         if (sp->user_datafmt == SGILOGDATAFMT_RAW)
 338                 tp = (uint32*) op;
 339         else {
 340                 if(sp->tbuflen < npixels) {
 341                         TIFFErrorExt(tif->tif_clientdata, module,
 342                                                  "Translation buffer too short");
 343                         return (0);
 344                 }
 345                 tp = (uint32*) sp->tbuf;
 346         }
 347         _TIFFmemset((void*) tp, 0, npixels*sizeof (tp[0]));
 348
 349         bp = (unsigned char*) tif->tif_rawcp;
 350         cc = tif->tif_rawcc;
 351         /* get each byte string */
 352         for (shft = 4*8; (shft -= 8) >= 0; ) {
 353                 for (i = 0; i < npixels && cc > 0; ) {
 354                         if (*bp >= 128) {               /* run */
 355                                 if( cc < 2 )
 356                                         break;
 357                                 rc = *bp++ + (2-128);
 358                                 b = (uint32)*bp++ << shft;
 359                                 cc -= 2;
 360                                 while (rc-- && i < npixels)
 361                                         tp[i++] |= b;
 362                         } else {                        /* non-run */
 363                                 rc = *bp++;             /* nul is noop */
 364                                 while (--cc && rc-- && i < npixels)
 365                                         tp[i++] |= (uint32)*bp++ << shft;
 366                         }
 367                 }
 368                 if (i != npixels) {
 369 #if defined(__WIN32__) && (defined(_MSC_VER) || defined(__MINGW32__))
 370                         TIFFErrorExt(tif->tif_clientdata, module,
 371                         "Not enough data at row %lu (short %I64d pixels)",
 372                                      (unsigned long) tif->tif_row,
 373                                      (unsigned __int64) (npixels - i));
 374 #else
 375                         TIFFErrorExt(tif->tif_clientdata, module,
 376                         "Not enough data at row %lu (short %llu pixels)",
 377                                      (unsigned long) tif->tif_row,
 378                                      (unsigned long long) (npixels - i));
 379 #endif
 380                         tif->tif_rawcp = (uint8*) bp;
 381                         tif->tif_rawcc = cc;
 382                         return (0);
 383                 }
 384         }
 385         (*sp->tfunc)(sp, op, npixels);
 386         tif->tif_rawcp = (uint8*) bp;
 387         tif->tif_rawcc = cc;
 388         return (1);
 389 }
 390
 391 /*
 392  * Decode a strip of pixels.  We break it into rows to
 393  * maintain synchrony with the encode algorithm, which
 394  * is row by row.
 395  */
 396 static int
 397 LogLuvDecodeStrip(TIFF* tif, uint8* bp, tmsize_t cc, uint16 s)
 398 {
 399         tmsize_t rowlen = TIFFScanlineSize(tif);
 400
 401         if (rowlen == 0)
 402                 return 0;
 403
 404         assert(cc%rowlen == 0);
 405         while (cc && (*tif->tif_decoderow)(tif, bp, rowlen, s)) {
 406                 bp += rowlen;
 407                 cc -= rowlen;
 408         }
 409         return (cc == 0);
 410 }
 411
 412 /*
 413  * Decode a tile of pixels.  We break it into rows to
 414  * maintain synchrony with the encode algorithm, which
 415  * is row by row.
 416  */
 417 static int
 418 LogLuvDecodeTile(TIFF* tif, uint8* bp, tmsize_t cc, uint16 s)
 419 {
 420         tmsize_t rowlen = TIFFTileRowSize(tif);
 421
 422         if (rowlen == 0)
 423                 return 0;
 424
 425         assert(cc%rowlen == 0);
 426         while (cc && (*tif->tif_decoderow)(tif, bp, rowlen, s)) {
 427                 bp += rowlen;
 428                 cc -= rowlen;
 429         }
 430         return (cc == 0);
 431 }
 432
 433 /*
 434  * Encode a row of 16-bit pixels.
 435  */
 436 static int
 437 LogL16Encode(TIFF* tif, uint8* bp, tmsize_t cc, uint16 s)
 438 {
 439         static const char module[] = "LogL16Encode";
 440         LogLuvState* sp = EncoderState(tif);
 441         int shft;
 442         tmsize_t i;
 443         tmsize_t j;
 444         tmsize_t npixels;
 445         uint8* op;
 446         int16* tp;
 447         int16 b;
 448         tmsize_t occ;
 449         int rc=0, mask;
 450         tmsize_t beg;
 451
 452         assert(s == 0);
 453         assert(sp != NULL);
 454         npixels = cc / sp->pixel_size;
 455
 456         if (sp->user_datafmt == SGILOGDATAFMT_16BIT)
 457                 tp = (int16*) bp;
 458         else {
 459                 tp = (int16*) sp->tbuf;
 460                 if(sp->tbuflen < npixels) {
 461                         TIFFErrorExt(tif->tif_clientdata, module,
 462                                                  "Translation buffer too short");
 463                         return (0);
 464                 }
 465                 (*sp->tfunc)(sp, bp, npixels);
 466         }
 467         /* compress each byte string */
 468         op = tif->tif_rawcp;
 469         occ = tif->tif_rawdatasize - tif->tif_rawcc;
 470         for (shft = 2*8; (shft -= 8) >= 0; )
 471                 for (i = 0; i < npixels; i += rc) {
 472                         if (occ < 4) {
 473                                 tif->tif_rawcp = op;
 474                                 tif->tif_rawcc = tif->tif_rawdatasize - occ;
 475                                 if (!TIFFFlushData1(tif))
 476                                         return (0);
 477                                 op = tif->tif_rawcp;
 478                                 occ = tif->tif_rawdatasize - tif->tif_rawcc;
 479                         }
 480                         mask = 0xff << shft;            /* find next run */
 481                         for (beg = i; beg < npixels; beg += rc) {
 482                                 b = (int16) (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                                 b = (int16) (tp[i] & mask);/*check short run */
 492                                 j = i+1;
 493                                 while ((tp[j++] & mask) == b)
 494                                         if (j == beg) {
 495                                                 *op++ = (uint8)(128-2+j-i);
 496                                                 *op++ = (uint8)(b >> shft);
 497                                                 occ -= 2;
 498                                                 i = beg;
 499                                                 break;
 500                                         }
 501                         }
 502                         while (i < beg) {               /* write out non-run */
 503                                 if ((j = beg-i) > 127) j = 127;
 504                                 if (occ < j+3) {
 505                                         tif->tif_rawcp = op;
 506                                         tif->tif_rawcc = tif->tif_rawdatasize - occ;
 507                                         if (!TIFFFlushData1(tif))
 508                                                 return (0);
 509                                         op = tif->tif_rawcp;
 510                                         occ = tif->tif_rawdatasize - tif->tif_rawcc;
 511                                 }
 512                                 *op++ = (uint8) j; occ--;
 513                                 while (j--) {
 514                                         *op++ = (uint8) (tp[i++] >> shft & 0xff);
 515                                         occ--;
 516                                 }
 517                         }
 518                         if (rc >= MINRUN) {             /* write out run */
 519                                 *op++ = (uint8) (128-2+rc);
 520                                 *op++ = (uint8) (tp[beg] >> shft & 0xff);
 521                                 occ -= 2;
 522                         } else
 523                                 rc = 0;
 524                 }
 525         tif->tif_rawcp = op;
 526         tif->tif_rawcc = tif->tif_rawdatasize - occ;
 527
 528         return (1);
 529 }
 530
 531 /*
 532  * Encode a row of 24-bit pixels.
 533  */
 534 static int
 535 LogLuvEncode24(TIFF* tif, uint8* bp, tmsize_t cc, uint16 s)
 536 {
 537         static const char module[] = "LogLuvEncode24";
 538         LogLuvState* sp = EncoderState(tif);
 539         tmsize_t i;
 540         tmsize_t npixels;
 541         tmsize_t occ;
 542         uint8* op;
 543         uint32* tp;
 544
 545         assert(s == 0);
 546         assert(sp != NULL);
 547         npixels = cc / sp->pixel_size;
 548
 549         if (sp->user_datafmt == SGILOGDATAFMT_RAW)
 550                 tp = (uint32*) bp;
 551         else {
 552                 tp = (uint32*) sp->tbuf;
 553                 if(sp->tbuflen < npixels) {
 554                         TIFFErrorExt(tif->tif_clientdata, module,
 555                                                  "Translation buffer too short");
 556                         return (0);
 557                 }
 558                 (*sp->tfunc)(sp, bp, npixels);
 559         }
 560         /* write out encoded pixels */
 561         op = tif->tif_rawcp;
 562         occ = tif->tif_rawdatasize - tif->tif_rawcc;
 563         for (i = npixels; i--; ) {
 564                 if (occ < 3) {
 565                         tif->tif_rawcp = op;
 566                         tif->tif_rawcc = tif->tif_rawdatasize - occ;
 567                         if (!TIFFFlushData1(tif))
 568                                 return (0);
 569                         op = tif->tif_rawcp;
 570                         occ = tif->tif_rawdatasize - tif->tif_rawcc;
 571                 }
 572                 *op++ = (uint8)(*tp >> 16);
 573                 *op++ = (uint8)(*tp >> 8 & 0xff);
 574                 *op++ = (uint8)(*tp++ & 0xff);
 575                 occ -= 3;
 576         }
 577         tif->tif_rawcp = op;
 578         tif->tif_rawcc = tif->tif_rawdatasize - occ;
 579
 580         return (1);
 581 }
 582
 583 /*
 584  * Encode a row of 32-bit pixels.
 585  */
 586 static int
 587 LogLuvEncode32(TIFF* tif, uint8* bp, tmsize_t cc, uint16 s)
 588 {
 589         static const char module[] = "LogLuvEncode32";
 590         LogLuvState* sp = EncoderState(tif);
 591         int shft;
 592         tmsize_t i;
 593         tmsize_t j;
 594         tmsize_t npixels;
 595         uint8* op;
 596         uint32* tp;
 597         uint32 b;
 598         tmsize_t occ;
 599         int rc=0, mask;
 600         tmsize_t beg;
 601
 602         assert(s == 0);
 603         assert(sp != NULL);
 604
 605         npixels = cc / sp->pixel_size;
 606
 607         if (sp->user_datafmt == SGILOGDATAFMT_RAW)
 608                 tp = (uint32*) bp;
 609         else {
 610                 tp = (uint32*) sp->tbuf;
 611                 if(sp->tbuflen < npixels) {
 612                         TIFFErrorExt(tif->tif_clientdata, module,
 613                                                  "Translation buffer too short");
 614                         return (0);
 615                 }
 616                 (*sp->tfunc)(sp, bp, npixels);
 617         }
 618         /* compress each byte string */
 619         op = tif->tif_rawcp;
 620         occ = tif->tif_rawdatasize - tif->tif_rawcc;
 621         for (shft = 4*8; (shft -= 8) >= 0; )
 622                 for (i = 0; i < npixels; i += rc) {
 623                         if (occ < 4) {
 624                                 tif->tif_rawcp = op;
 625                                 tif->tif_rawcc = tif->tif_rawdatasize - occ;
 626                                 if (!TIFFFlushData1(tif))
 627                                         return (0);
 628                                 op = tif->tif_rawcp;
 629                                 occ = tif->tif_rawdatasize - tif->tif_rawcc;
 630                         }
 631                         mask = 0xff << shft;            /* find next run */
 632                         for (beg = i; beg < npixels; beg += rc) {
 633                                 b = tp[beg] & mask;
 634                                 rc = 1;
 635                                 while (rc < 127+2 && beg+rc < npixels &&
 636                                                 (tp[beg+rc] & mask) == b)
 637                                         rc++;
 638                                 if (rc >= MINRUN)
 639                                         break;          /* long enough */
 640                         }
 641                         if (beg-i > 1 && beg-i < MINRUN) {
 642                                 b = tp[i] & mask;       /* check short run */
 643                                 j = i+1;
 644                                 while ((tp[j++] & mask) == b)
 645                                         if (j == beg) {
 646                                                 *op++ = (uint8)(128-2+j-i);
 647                                                 *op++ = (uint8)(b >> shft);
 648                                                 occ -= 2;
 649                                                 i = beg;
 650                                                 break;
 651                                         }
 652                         }
 653                         while (i < beg) {               /* write out non-run */
 654                                 if ((j = beg-i) > 127) j = 127;
 655                                 if (occ < j+3) {
 656                                         tif->tif_rawcp = op;
 657                                         tif->tif_rawcc = tif->tif_rawdatasize - occ;
 658                                         if (!TIFFFlushData1(tif))
 659                                                 return (0);
 660                                         op = tif->tif_rawcp;
 661                                         occ = tif->tif_rawdatasize - tif->tif_rawcc;
 662                                 }
 663                                 *op++ = (uint8) j; occ--;
 664                                 while (j--) {
 665                                         *op++ = (uint8)(tp[i++] >> shft & 0xff);
 666                                         occ--;
 667                                 }
 668                         }
 669                         if (rc >= MINRUN) {             /* write out run */
 670                                 *op++ = (uint8) (128-2+rc);
 671                                 *op++ = (uint8)(tp[beg] >> shft & 0xff);
 672                                 occ -= 2;
 673                         } else
 674                                 rc = 0;
 675                 }
 676         tif->tif_rawcp = op;
 677         tif->tif_rawcc = tif->tif_rawdatasize - occ;
 678
 679         return (1);
 680 }
 681
 682 /*
 683  * Encode a strip of pixels.  We break it into rows to
 684  * avoid encoding runs across row boundaries.
 685  */
 686 static int
 687 LogLuvEncodeStrip(TIFF* tif, uint8* bp, tmsize_t cc, uint16 s)
 688 {
 689         tmsize_t rowlen = TIFFScanlineSize(tif);
 690
 691         if (rowlen == 0)
 692                 return 0;
 693
 694         assert(cc%rowlen == 0);
 695         while (cc && (*tif->tif_encoderow)(tif, bp, rowlen, s) == 1) {
 696                 bp += rowlen;
 697                 cc -= rowlen;
 698         }
 699         return (cc == 0);
 700 }
 701
 702 /*
 703  * Encode a tile of pixels.  We break it into rows to
 704  * avoid encoding runs across row boundaries.
 705  */
 706 static int
 707 LogLuvEncodeTile(TIFF* tif, uint8* bp, tmsize_t cc, uint16 s)
 708 {
 709         tmsize_t rowlen = TIFFTileRowSize(tif);
 710
 711         if (rowlen == 0)
 712                 return 0;
 713
 714         assert(cc%rowlen == 0);
 715         while (cc && (*tif->tif_encoderow)(tif, bp, rowlen, s) == 1) {
 716                 bp += rowlen;
 717                 cc -= rowlen;
 718         }
 719         return (cc == 0);
 720 }
 721
 722 /*
 723  * Encode/Decode functions for converting to and from user formats.
 724  */
 725
 726 #include "uvcode.h"
 727
 728 #ifndef UVSCALE
 729 #define U_NEU           0.210526316
 730 #define V_NEU           0.473684211
 731 #define UVSCALE         410.
 732 #endif
 733
 734 #ifndef M_LN2
 735 #define M_LN2           0.69314718055994530942
 736 #endif
 737 #ifndef M_PI
 738 #define M_PI            3.14159265358979323846
 739 #endif
 740 #undef log2 /* Conflict with C'99 function */
 741 #define log2(x)         ((1./M_LN2)*log(x))
 742 #undef exp2  /* Conflict with C'99 function */
 743 #define exp2(x)         exp(M_LN2*(x))
 744
 745 #define itrunc(x,m)     ((m)==SGILOGENCODE_NODITHER ? \
 746                                 (int)(x) : \
 747                                 (int)((x) + rand()*(1./RAND_MAX) - .5))
 748
 749 #if !LOGLUV_PUBLIC
 750 static
 751 #endif
 752 double
 753 LogL16toY(int p16)              /* compute luminance from 16-bit LogL */
 754 {
 755         int     Le = p16 & 0x7fff;
 756         double  Y;
 757
 758         if (!Le)
 759                 return (0.);
 760         Y = exp(M_LN2/256.*(Le+.5) - M_LN2*64.);
 761         return (!(p16 & 0x8000) ? Y : -Y);
 762 }
 763
 764 #if !LOGLUV_PUBLIC
 765 static
 766 #endif
 767 int
 768 LogL16fromY(double Y, int em)   /* get 16-bit LogL from Y */
 769 {
 770         if (Y >= 1.8371976e19)
 771                 return (0x7fff);
 772         if (Y <= -1.8371976e19)
 773                 return (0xffff);
 774         if (Y > 5.4136769e-20)
 775                 return itrunc(256.*(log2(Y) + 64.), em);
 776         if (Y < -5.4136769e-20)
 777                 return (~0x7fff | itrunc(256.*(log2(-Y) + 64.), em));
 778         return (0);
 779 }
 780
 781 static void
 782 L16toY(LogLuvState* sp, uint8* op, tmsize_t n)
 783 {
 784         int16* l16 = (int16*) sp->tbuf;
 785         float* yp = (float*) op;
 786
 787         while (n-- > 0)
 788                 *yp++ = (float)LogL16toY(*l16++);
 789 }
 790
 791 static void
 792 L16toGry(LogLuvState* sp, uint8* op, tmsize_t n)
 793 {
 794         int16* l16 = (int16*) sp->tbuf;
 795         uint8* gp = (uint8*) op;
 796
 797         while (n-- > 0) {
 798                 double Y = LogL16toY(*l16++);
 799                 *gp++ = (uint8) ((Y <= 0.) ? 0 : (Y >= 1.) ? 255 : (int)(256.*sqrt(Y)));
 800         }
 801 }
 802
 803 static void
 804 L16fromY(LogLuvState* sp, uint8* op, tmsize_t n)
 805 {
 806         int16* l16 = (int16*) sp->tbuf;
 807         float* yp = (float*) op;
 808
 809         while (n-- > 0)
 810                 *l16++ = (int16) (LogL16fromY(*yp++, sp->encode_meth));
 811 }
 812
 813 #if !LOGLUV_PUBLIC
 814 static
 815 #endif
 816 void
 817 XYZtoRGB24(float xyz[3], uint8 rgb[3])
 818 {
 819         double  r, g, b;
 820                                         /* assume CCIR-709 primaries */
 821         r =  2.690*xyz[0] + -1.276*xyz[1] + -0.414*xyz[2];
 822         g = -1.022*xyz[0] +  1.978*xyz[1] +  0.044*xyz[2];
 823         b =  0.061*xyz[0] + -0.224*xyz[1] +  1.163*xyz[2];
 824                                         /* assume 2.0 gamma for speed */
 825         /* could use integer sqrt approx., but this is probably faster */
 826         rgb[0] = (uint8)((r<=0.) ? 0 : (r >= 1.) ? 255 : (int)(256.*sqrt(r)));
 827         rgb[1] = (uint8)((g<=0.) ? 0 : (g >= 1.) ? 255 : (int)(256.*sqrt(g)));
 828         rgb[2] = (uint8)((b<=0.) ? 0 : (b >= 1.) ? 255 : (int)(256.*sqrt(b)));
 829 }
 830
 831 #if !LOGLUV_PUBLIC
 832 static
 833 #endif
 834 double
 835 LogL10toY(int p10)              /* compute luminance from 10-bit LogL */
 836 {
 837         if (p10 == 0)
 838                 return (0.);
 839         return (exp(M_LN2/64.*(p10+.5) - M_LN2*12.));
 840 }
 841
 842 #if !LOGLUV_PUBLIC
 843 static
 844 #endif
 845 int
 846 LogL10fromY(double Y, int em)   /* get 10-bit LogL from Y */
 847 {
 848         if (Y >= 15.742)
 849                 return (0x3ff);
 850         else if (Y <= .00024283)
 851                 return (0);
 852         else
 853                 return itrunc(64.*(log2(Y) + 12.), em);
 854 }
 855
 856 #define NANGLES         100
 857 #define uv2ang(u, v)    ( (NANGLES*.499999999/M_PI) \
 858                                 * atan2((v)-V_NEU,(u)-U_NEU) + .5*NANGLES )
 859
 860 static int
 861 oog_encode(double u, double v)          /* encode out-of-gamut chroma */
 862 {
 863         static int      oog_table[NANGLES];
 864         static int      initialized = 0;
 865         register int    i;
 866
 867         if (!initialized) {             /* set up perimeter table */
 868                 double  eps[NANGLES], ua, va, ang, epsa;
 869                 int     ui, vi, ustep;
 870                 for (i = NANGLES; i--; )
 871                         eps[i] = 2.;
 872                 for (vi = UV_NVS; vi--; ) {
 873                         va = UV_VSTART + (vi+.5)*UV_SQSIZ;
 874                         ustep = uv_row[vi].nus-1;
 875                         if (vi == UV_NVS-1 || vi == 0 || ustep <= 0)
 876                                 ustep = 1;
 877                         for (ui = uv_row[vi].nus-1; ui >= 0; ui -= ustep) {
 878                                 ua = uv_row[vi].ustart + (ui+.5)*UV_SQSIZ;
 879                                 ang = uv2ang(ua, va);
 880                                 i = (int) ang;
 881                                 epsa = fabs(ang - (i+.5));
 882                                 if (epsa < eps[i]) {
 883                                         oog_table[i] = uv_row[vi].ncum + ui;
 884                                         eps[i] = epsa;
 885                                 }
 886                         }
 887                 }
 888                 for (i = NANGLES; i--; )        /* fill any holes */
 889                         if (eps[i] > 1.5) {
 890                                 int     i1, i2;
 891                                 for (i1 = 1; i1 < NANGLES/2; i1++)
 892                                         if (eps[(i+i1)%NANGLES] < 1.5)
 893                                                 break;
 894                                 for (i2 = 1; i2 < NANGLES/2; i2++)
 895                                         if (eps[(i+NANGLES-i2)%NANGLES] < 1.5)
 896                                                 break;
 897                                 if (i1 < i2)
 898                                         oog_table[i] =
 899                                                 oog_table[(i+i1)%NANGLES];
 900                                 else
 901                                         oog_table[i] =
 902                                                 oog_table[(i+NANGLES-i2)%NANGLES];
 903                         }
 904                 initialized = 1;
 905         }
 906         i = (int) uv2ang(u, v);         /* look up hue angle */
 907         return (oog_table[i]);
 908 }
 909
 910 #undef uv2ang
 911 #undef NANGLES
 912
 913 #if !LOGLUV_PUBLIC
 914 static
 915 #endif
 916 int
 917 uv_encode(double u, double v, int em)   /* encode (u',v') coordinates */
 918 {
 919         register int    vi, ui;
 920
 921         if (v < UV_VSTART)
 922                 return oog_encode(u, v);
 923         vi = itrunc((v - UV_VSTART)*(1./UV_SQSIZ), em);
 924         if (vi >= UV_NVS)
 925                 return oog_encode(u, v);
 926         if (u < uv_row[vi].ustart)
 927                 return oog_encode(u, v);
 928         ui = itrunc((u - uv_row[vi].ustart)*(1./UV_SQSIZ), em);
 929         if (ui >= uv_row[vi].nus)
 930                 return oog_encode(u, v);
 931
 932         return (uv_row[vi].ncum + ui);
 933 }
 934
 935 #if !LOGLUV_PUBLIC
 936 static
 937 #endif
 938 int
 939 uv_decode(double *up, double *vp, int c)        /* decode (u',v') index */
 940 {
 941         int     upper, lower;
 942         register int    ui, vi;
 943
 944         if (c < 0 || c >= UV_NDIVS)
 945                 return (-1);
 946         lower = 0;                              /* binary search */
 947         upper = UV_NVS;
 948         while (upper - lower > 1) {
 949                 vi = (lower + upper) >> 1;
 950                 ui = c - uv_row[vi].ncum;
 951                 if (ui > 0)
 952                         lower = vi;
 953                 else if (ui < 0)
 954                         upper = vi;
 955                 else {
 956                         lower = vi;
 957                         break;
 958                 }
 959         }
 960         vi = lower;
 961         ui = c - uv_row[vi].ncum;
 962         *up = uv_row[vi].ustart + (ui+.5)*UV_SQSIZ;
 963         *vp = UV_VSTART + (vi+.5)*UV_SQSIZ;
 964         return (0);
 965 }
 966
 967 #if !LOGLUV_PUBLIC
 968 static
 969 #endif
 970 void
 971 LogLuv24toXYZ(uint32 p, float XYZ[3])
 972 {
 973         int     Ce;
 974         double  L, u, v, s, x, y;
 975                                         /* decode luminance */
 976         L = LogL10toY(p>>14 & 0x3ff);
 977         if (L <= 0.) {
 978                 XYZ[0] = XYZ[1] = XYZ[2] = 0.;
 979                 return;
 980         }
 981                                         /* decode color */
 982         Ce = p & 0x3fff;
 983         if (uv_decode(&u, &v, Ce) < 0) {
 984                 u = U_NEU; v = V_NEU;
 985         }
 986         s = 1./(6.*u - 16.*v + 12.);
 987         x = 9.*u * s;
 988         y = 4.*v * s;
 989                                         /* convert to XYZ */
 990         XYZ[0] = (float)(x/y * L);
 991         XYZ[1] = (float)L;
 992         XYZ[2] = (float)((1.-x-y)/y * L);
 993 }
 994
 995 #if !LOGLUV_PUBLIC
 996 static
 997 #endif
 998 uint32
 999 LogLuv24fromXYZ(float XYZ[3], int em)
1000 {
1001         int     Le, Ce;
1002         double  u, v, s;
1003                                         /* encode luminance */
1004         Le = LogL10fromY(XYZ[1], em);
1005                                         /* encode color */
1006         s = XYZ[0] + 15.*XYZ[1] + 3.*XYZ[2];
1007         if (!Le || s <= 0.) {
1008                 u = U_NEU;
1009                 v = V_NEU;
1010         } else {
1011                 u = 4.*XYZ[0] / s;
1012                 v = 9.*XYZ[1] / s;
1013         }
1014         Ce = uv_encode(u, v, em);
1015         if (Ce < 0)                     /* never happens */
1016                 Ce = uv_encode(U_NEU, V_NEU, SGILOGENCODE_NODITHER);
1017                                         /* combine encodings */
1018         return (Le << 14 | Ce);
1019 }
1020
1021 static void
1022 Luv24toXYZ(LogLuvState* sp, uint8* op, tmsize_t n)
1023 {
1024         uint32* luv = (uint32*) sp->tbuf;
1025         float* xyz = (float*) op;
1026
1027         while (n-- > 0) {
1028                 LogLuv24toXYZ(*luv, xyz);
1029                 xyz += 3;
1030                 luv++;
1031         }
1032 }
1033
1034 static void
1035 Luv24toLuv48(LogLuvState* sp, uint8* op, tmsize_t n)
1036 {
1037         uint32* luv = (uint32*) sp->tbuf;
1038         int16* luv3 = (int16*) op;
1039
1040         while (n-- > 0) {
1041                 double u, v;
1042
1043                 *luv3++ = (int16)((*luv >> 12 & 0xffd) + 13314);
1044                 if (uv_decode(&u, &v, *luv&0x3fff) < 0) {
1045                         u = U_NEU;
1046                         v = V_NEU;
1047                 }
1048                 *luv3++ = (int16)(u * (1L<<15));
1049                 *luv3++ = (int16)(v * (1L<<15));
1050                 luv++;
1051         }
1052 }
1053
1054 static void
1055 Luv24toRGB(LogLuvState* sp, uint8* op, tmsize_t n)
1056 {
1057         uint32* luv = (uint32*) sp->tbuf;
1058         uint8* rgb = (uint8*) op;
1059
1060         while (n-- > 0) {
1061                 float xyz[3];
1062
1063                 LogLuv24toXYZ(*luv++, xyz);
1064                 XYZtoRGB24(xyz, rgb);
1065                 rgb += 3;
1066         }
1067 }
1068
1069 static void
1070 Luv24fromXYZ(LogLuvState* sp, uint8* op, tmsize_t n)
1071 {
1072         uint32* luv = (uint32*) sp->tbuf;
1073         float* xyz = (float*) op;
1074
1075         while (n-- > 0) {
1076                 *luv++ = LogLuv24fromXYZ(xyz, sp->encode_meth);
1077                 xyz += 3;
1078         }
1079 }
1080
1081 static void
1082 Luv24fromLuv48(LogLuvState* sp, uint8* op, tmsize_t n)
1083 {
1084         uint32* luv = (uint32*) sp->tbuf;
1085         int16* luv3 = (int16*) op;
1086
1087         while (n-- > 0) {
1088                 int Le, Ce;
1089
1090                 if (luv3[0] <= 0)
1091                         Le = 0;
1092                 else if (luv3[0] >= (1<<12)+3314)
1093                         Le = (1<<10) - 1;
1094                 else if (sp->encode_meth == SGILOGENCODE_NODITHER)
1095                         Le = (luv3[0]-3314) >> 2;
1096                 else
1097                         Le = itrunc(.25*(luv3[0]-3314.), sp->encode_meth);
1098
1099                 Ce = uv_encode((luv3[1]+.5)/(1<<15), (luv3[2]+.5)/(1<<15),
1100                                         sp->encode_meth);
1101                 if (Ce < 0)     /* never happens */
1102                         Ce = uv_encode(U_NEU, V_NEU, SGILOGENCODE_NODITHER);
1103                 *luv++ = (uint32)Le << 14 | Ce;
1104                 luv3 += 3;
1105         }
1106 }
1107
1108 #if !LOGLUV_PUBLIC
1109 static
1110 #endif
1111 void
1112 LogLuv32toXYZ(uint32 p, float XYZ[3])
1113 {
1114         double  L, u, v, s, x, y;
1115                                         /* decode luminance */
1116         L = LogL16toY((int)p >> 16);
1117         if (L <= 0.) {
1118                 XYZ[0] = XYZ[1] = XYZ[2] = 0.;
1119                 return;
1120         }
1121                                         /* decode color */
1122         u = 1./UVSCALE * ((p>>8 & 0xff) + .5);
1123         v = 1./UVSCALE * ((p & 0xff) + .5);
1124         s = 1./(6.*u - 16.*v + 12.);
1125         x = 9.*u * s;
1126         y = 4.*v * s;
1127                                         /* convert to XYZ */
1128         XYZ[0] = (float)(x/y * L);
1129         XYZ[1] = (float)L;
1130         XYZ[2] = (float)((1.-x-y)/y * L);
1131 }
1132
1133 #if !LOGLUV_PUBLIC
1134 static
1135 #endif
1136 uint32
1137 LogLuv32fromXYZ(float XYZ[3], int em)
1138 {
1139         unsigned int    Le, ue, ve;
1140         double  u, v, s;
1141                                         /* encode luminance */
1142         Le = (unsigned int)LogL16fromY(XYZ[1], em);
1143                                         /* encode color */
1144         s = XYZ[0] + 15.*XYZ[1] + 3.*XYZ[2];
1145         if (!Le || s <= 0.) {
1146                 u = U_NEU;
1147                 v = V_NEU;
1148         } else {
1149                 u = 4.*XYZ[0] / s;
1150                 v = 9.*XYZ[1] / s;
1151         }
1152         if (u <= 0.) ue = 0;
1153         else ue = itrunc(UVSCALE*u, em);
1154         if (ue > 255) ue = 255;
1155         if (v <= 0.) ve = 0;
1156         else ve = itrunc(UVSCALE*v, em);
1157         if (ve > 255) ve = 255;
1158                                         /* combine encodings */
1159         return (Le << 16 | ue << 8 | ve);
1160 }
1161
1162 static void
1163 Luv32toXYZ(LogLuvState* sp, uint8* op, tmsize_t n)
1164 {
1165         uint32* luv = (uint32*) sp->tbuf;
1166         float* xyz = (float*) op;
1167
1168         while (n-- > 0) {
1169                 LogLuv32toXYZ(*luv++, xyz);
1170                 xyz += 3;
1171         }
1172 }
1173
1174 static void
1175 Luv32toLuv48(LogLuvState* sp, uint8* op, tmsize_t n)
1176 {
1177         uint32* luv = (uint32*) sp->tbuf;
1178         int16* luv3 = (int16*) op;
1179
1180         while (n-- > 0) {
1181                 double u, v;
1182
1183                 *luv3++ = (int16)(*luv >> 16);
1184                 u = 1./UVSCALE * ((*luv>>8 & 0xff) + .5);
1185                 v = 1./UVSCALE * ((*luv & 0xff) + .5);
1186                 *luv3++ = (int16)(u * (1L<<15));
1187                 *luv3++ = (int16)(v * (1L<<15));
1188                 luv++;
1189         }
1190 }
1191
1192 static void
1193 Luv32toRGB(LogLuvState* sp, uint8* op, tmsize_t n)
1194 {
1195         uint32* luv = (uint32*) sp->tbuf;
1196         uint8* rgb = (uint8*) op;
1197
1198         while (n-- > 0) {
1199                 float xyz[3];
1200
1201                 LogLuv32toXYZ(*luv++, xyz);
1202                 XYZtoRGB24(xyz, rgb);
1203                 rgb += 3;
1204         }
1205 }
1206
1207 static void
1208 Luv32fromXYZ(LogLuvState* sp, uint8* op, tmsize_t n)
1209 {
1210         uint32* luv = (uint32*) sp->tbuf;
1211         float* xyz = (float*) op;
1212
1213         while (n-- > 0) {
1214                 *luv++ = LogLuv32fromXYZ(xyz, sp->encode_meth);
1215                 xyz += 3;
1216         }
1217 }
1218
1219 static void
1220 Luv32fromLuv48(LogLuvState* sp, uint8* op, tmsize_t n)
1221 {
1222         uint32* luv = (uint32*) sp->tbuf;
1223         int16* luv3 = (int16*) op;
1224
1225         if (sp->encode_meth == SGILOGENCODE_NODITHER) {
1226                 while (n-- > 0) {
1227                         *luv++ = (uint32)luv3[0] << 16 |
1228                                 (luv3[1]*(uint32)(UVSCALE+.5) >> 7 & 0xff00) |
1229                                 (luv3[2]*(uint32)(UVSCALE+.5) >> 15 & 0xff);
1230                         luv3 += 3;
1231                 }
1232                 return;
1233         }
1234         while (n-- > 0) {
1235                 *luv++ = (uint32)luv3[0] << 16 |
1236         (itrunc(luv3[1]*(UVSCALE/(1<<15)), sp->encode_meth) << 8 & 0xff00) |
1237                 (itrunc(luv3[2]*(UVSCALE/(1<<15)), sp->encode_meth) & 0xff);
1238                 luv3 += 3;
1239         }
1240 }
1241
1242 static void
1243 _logLuvNop(LogLuvState* sp, uint8* op, tmsize_t n)
1244 {
1245         (void) sp; (void) op; (void) n;
1246 }
1247
1248 static int
1249 LogL16GuessDataFmt(TIFFDirectory *td)
1250 {
1251 #define PACK(s,b,f)     (((b)<<6)|((s)<<3)|(f))
1252         switch (PACK(td->td_samplesperpixel, td->td_bitspersample, td->td_sampleformat)) {
1253         case PACK(1, 32, SAMPLEFORMAT_IEEEFP):
1254                 return (SGILOGDATAFMT_FLOAT);
1255         case PACK(1, 16, SAMPLEFORMAT_VOID):
1256         case PACK(1, 16, SAMPLEFORMAT_INT):
1257         case PACK(1, 16, SAMPLEFORMAT_UINT):
1258                 return (SGILOGDATAFMT_16BIT);
1259         case PACK(1,  8, SAMPLEFORMAT_VOID):
1260         case PACK(1,  8, SAMPLEFORMAT_UINT):
1261                 return (SGILOGDATAFMT_8BIT);
1262         }
1263 #undef PACK
1264         return (SGILOGDATAFMT_UNKNOWN);
1265 }
1266
1267
1268 #define TIFF_SIZE_T_MAX ((size_t) ~ ((size_t)0))
1269 #define TIFF_TMSIZE_T_MAX (tmsize_t)(TIFF_SIZE_T_MAX >> 1)
1270
1271 static tmsize_t
1272 multiply_ms(tmsize_t m1, tmsize_t m2)
1273 {
1274         if( m1 == 0 || m2 > TIFF_TMSIZE_T_MAX / m1 )
1275             return 0;
1276         return m1 * m2;
1277 }
1278
1279 static int
1280 LogL16InitState(TIFF* tif)
1281 {
1282         static const char module[] = "LogL16InitState";
1283         TIFFDirectory *td = &tif->tif_dir;
1284         LogLuvState* sp = DecoderState(tif);
1285
1286         assert(sp != NULL);
1287         assert(td->td_photometric == PHOTOMETRIC_LOGL);
1288
1289         if( td->td_samplesperpixel != 1 )
1290         {
1291                 TIFFErrorExt(tif->tif_clientdata, module,
1292                              "Sorry, can not handle LogL image with %s=%d",
1293                              "Samples/pixel", td->td_samplesperpixel);
1294                 return 0;
1295         }
1296
1297         /* for some reason, we can't do this in TIFFInitLogL16 */
1298         if (sp->user_datafmt == SGILOGDATAFMT_UNKNOWN)
1299                 sp->user_datafmt = LogL16GuessDataFmt(td);
1300         switch (sp->user_datafmt) {
1301         case SGILOGDATAFMT_FLOAT:
1302                 sp->pixel_size = sizeof (float);
1303                 break;
1304         case SGILOGDATAFMT_16BIT:
1305                 sp->pixel_size = sizeof (int16);
1306                 break;
1307         case SGILOGDATAFMT_8BIT:
1308                 sp->pixel_size = sizeof (uint8);
1309                 break;
1310         default:
1311                 TIFFErrorExt(tif->tif_clientdata, module,
1312                     "No support for converting user data format to LogL");
1313                 return (0);
1314         }
1315         if( isTiled(tif) )
1316             sp->tbuflen = multiply_ms(td->td_tilewidth, td->td_tilelength);
1317         else if( td->td_rowsperstrip < td->td_imagelength )
1318             sp->tbuflen = multiply_ms(td->td_imagewidth, td->td_rowsperstrip);
1319         else
1320             sp->tbuflen = multiply_ms(td->td_imagewidth, td->td_imagelength);
1321         if (multiply_ms(sp->tbuflen, sizeof (int16)) == 0 ||
1322             (sp->tbuf = (uint8*) _TIFFmalloc(sp->tbuflen * sizeof (int16))) == NULL) {
1323                 TIFFErrorExt(tif->tif_clientdata, module, "No space for SGILog translation buffer");
1324                 return (0);
1325         }
1326         return (1);
1327 }
1328
1329 static int
1330 LogLuvGuessDataFmt(TIFFDirectory *td)
1331 {
1332         int guess;
1333
1334         /*
1335          * If the user didn't tell us their datafmt,
1336          * take our best guess from the bitspersample.
1337          */
1338 #define PACK(a,b)       (((a)<<3)|(b))
1339         switch (PACK(td->td_bitspersample, td->td_sampleformat)) {
1340         case PACK(32, SAMPLEFORMAT_IEEEFP):
1341                 guess = SGILOGDATAFMT_FLOAT;
1342                 break;
1343         case PACK(32, SAMPLEFORMAT_VOID):
1344         case PACK(32, SAMPLEFORMAT_UINT):
1345         case PACK(32, SAMPLEFORMAT_INT):
1346                 guess = SGILOGDATAFMT_RAW;
1347                 break;
1348         case PACK(16, SAMPLEFORMAT_VOID):
1349         case PACK(16, SAMPLEFORMAT_INT):
1350         case PACK(16, SAMPLEFORMAT_UINT):
1351                 guess = SGILOGDATAFMT_16BIT;
1352                 break;
1353         case PACK( 8, SAMPLEFORMAT_VOID):
1354         case PACK( 8, SAMPLEFORMAT_UINT):
1355                 guess = SGILOGDATAFMT_8BIT;
1356                 break;
1357         default:
1358                 guess = SGILOGDATAFMT_UNKNOWN;
1359                 break;
1360 #undef PACK
1361         }
1362         /*
1363          * Double-check samples per pixel.
1364          */
1365         switch (td->td_samplesperpixel) {
1366         case 1:
1367                 if (guess != SGILOGDATAFMT_RAW)
1368                         guess = SGILOGDATAFMT_UNKNOWN;
1369                 break;
1370         case 3:
1371                 if (guess == SGILOGDATAFMT_RAW)
1372                         guess = SGILOGDATAFMT_UNKNOWN;
1373                 break;
1374         default:
1375                 guess = SGILOGDATAFMT_UNKNOWN;
1376                 break;
1377         }
1378         return (guess);
1379 }
1380
1381 static int
1382 LogLuvInitState(TIFF* tif)
1383 {
1384         static const char module[] = "LogLuvInitState";
1385         TIFFDirectory* td = &tif->tif_dir;
1386         LogLuvState* sp = DecoderState(tif);
1387
1388         assert(sp != NULL);
1389         assert(td->td_photometric == PHOTOMETRIC_LOGLUV);
1390
1391         /* for some reason, we can't do this in TIFFInitLogLuv */
1392         if (td->td_planarconfig != PLANARCONFIG_CONTIG) {
1393                 TIFFErrorExt(tif->tif_clientdata, module,
1394                     "SGILog compression cannot handle non-contiguous data");
1395                 return (0);
1396         }
1397         if (sp->user_datafmt == SGILOGDATAFMT_UNKNOWN)
1398                 sp->user_datafmt = LogLuvGuessDataFmt(td);
1399         switch (sp->user_datafmt) {
1400         case SGILOGDATAFMT_FLOAT:
1401                 sp->pixel_size = 3*sizeof (float);
1402                 break;
1403         case SGILOGDATAFMT_16BIT:
1404                 sp->pixel_size = 3*sizeof (int16);
1405                 break;
1406         case SGILOGDATAFMT_RAW:
1407                 sp->pixel_size = sizeof (uint32);
1408                 break;
1409         case SGILOGDATAFMT_8BIT:
1410                 sp->pixel_size = 3*sizeof (uint8);
1411                 break;
1412         default:
1413                 TIFFErrorExt(tif->tif_clientdata, module,
1414                     "No support for converting user data format to LogLuv");
1415                 return (0);
1416         }
1417         if( isTiled(tif) )
1418             sp->tbuflen = multiply_ms(td->td_tilewidth, td->td_tilelength);
1419         else if( td->td_rowsperstrip < td->td_imagelength )
1420             sp->tbuflen = multiply_ms(td->td_imagewidth, td->td_rowsperstrip);
1421         else
1422             sp->tbuflen = multiply_ms(td->td_imagewidth, td->td_imagelength);
1423         if (multiply_ms(sp->tbuflen, sizeof (uint32)) == 0 ||
1424             (sp->tbuf = (uint8*) _TIFFmalloc(sp->tbuflen * sizeof (uint32))) == NULL) {
1425                 TIFFErrorExt(tif->tif_clientdata, module, "No space for SGILog translation buffer");
1426                 return (0);
1427         }
1428         return (1);
1429 }
1430
1431 static int
1432 LogLuvFixupTags(TIFF* tif)
1433 {
1434         (void) tif;
1435         return (1);
1436 }
1437
1438 static int
1439 LogLuvSetupDecode(TIFF* tif)
1440 {
1441         static const char module[] = "LogLuvSetupDecode";
1442         LogLuvState* sp = DecoderState(tif);
1443         TIFFDirectory* td = &tif->tif_dir;
1444
1445         tif->tif_postdecode = _TIFFNoPostDecode;
1446         switch (td->td_photometric) {
1447         case PHOTOMETRIC_LOGLUV:
1448                 if (!LogLuvInitState(tif))
1449                         break;
1450                 if (td->td_compression == COMPRESSION_SGILOG24) {
1451                         tif->tif_decoderow = LogLuvDecode24;
1452                         switch (sp->user_datafmt) {
1453                         case SGILOGDATAFMT_FLOAT:
1454                                 sp->tfunc = Luv24toXYZ;
1455                                 break;
1456                         case SGILOGDATAFMT_16BIT:
1457                                 sp->tfunc = Luv24toLuv48;
1458                                 break;
1459                         case SGILOGDATAFMT_8BIT:
1460                                 sp->tfunc = Luv24toRGB;
1461                                 break;
1462                         }
1463                 } else {
1464                         tif->tif_decoderow = LogLuvDecode32;
1465                         switch (sp->user_datafmt) {
1466                         case SGILOGDATAFMT_FLOAT:
1467                                 sp->tfunc = Luv32toXYZ;
1468                                 break;
1469                         case SGILOGDATAFMT_16BIT:
1470                                 sp->tfunc = Luv32toLuv48;
1471                                 break;
1472                         case SGILOGDATAFMT_8BIT:
1473                                 sp->tfunc = Luv32toRGB;
1474                                 break;
1475                         }
1476                 }
1477                 return (1);
1478         case PHOTOMETRIC_LOGL:
1479                 if (!LogL16InitState(tif))
1480                         break;
1481                 tif->tif_decoderow = LogL16Decode;
1482                 switch (sp->user_datafmt) {
1483                 case SGILOGDATAFMT_FLOAT:
1484                         sp->tfunc = L16toY;
1485                         break;
1486                 case SGILOGDATAFMT_8BIT:
1487                         sp->tfunc = L16toGry;
1488                         break;
1489                 }
1490                 return (1);
1491         default:
1492                 TIFFErrorExt(tif->tif_clientdata, module,
1493                     "Inappropriate photometric interpretation %d for SGILog compression; %s",
1494                     td->td_photometric, "must be either LogLUV or LogL");
1495                 break;
1496         }
1497         return (0);
1498 }
1499
1500 static int
1501 LogLuvSetupEncode(TIFF* tif)
1502 {
1503         static const char module[] = "LogLuvSetupEncode";
1504         LogLuvState* sp = EncoderState(tif);
1505         TIFFDirectory* td = &tif->tif_dir;
1506
1507         switch (td->td_photometric) {
1508         case PHOTOMETRIC_LOGLUV:
1509                 if (!LogLuvInitState(tif))
1510                         break;
1511                 if (td->td_compression == COMPRESSION_SGILOG24) {
1512                         tif->tif_encoderow = LogLuvEncode24;
1513                         switch (sp->user_datafmt) {
1514                         case SGILOGDATAFMT_FLOAT:
1515                                 sp->tfunc = Luv24fromXYZ;
1516                                 break;
1517                         case SGILOGDATAFMT_16BIT:
1518                                 sp->tfunc = Luv24fromLuv48;
1519                                 break;
1520                         case SGILOGDATAFMT_RAW:
1521                                 break;
1522                         default:
1523                                 goto notsupported;
1524                         }
1525                 } else {
1526                         tif->tif_encoderow = LogLuvEncode32;
1527                         switch (sp->user_datafmt) {
1528                         case SGILOGDATAFMT_FLOAT:
1529                                 sp->tfunc = Luv32fromXYZ;
1530                                 break;
1531                         case SGILOGDATAFMT_16BIT:
1532                                 sp->tfunc = Luv32fromLuv48;
1533                                 break;
1534                         case SGILOGDATAFMT_RAW:
1535                                 break;
1536                         default:
1537                                 goto notsupported;
1538                         }
1539                 }
1540                 break;
1541         case PHOTOMETRIC_LOGL:
1542                 if (!LogL16InitState(tif))
1543                         break;
1544                 tif->tif_encoderow = LogL16Encode;
1545                 switch (sp->user_datafmt) {
1546                 case SGILOGDATAFMT_FLOAT:
1547                         sp->tfunc = L16fromY;
1548                         break;
1549                 case SGILOGDATAFMT_16BIT:
1550                         break;
1551                 default:
1552                         goto notsupported;
1553                 }
1554                 break;
1555         default:
1556                 TIFFErrorExt(tif->tif_clientdata, module,
1557                     "Inappropriate photometric interpretation %d for SGILog compression; %s",
1558                     td->td_photometric, "must be either LogLUV or LogL");
1559                 break;
1560         }
1561         sp->encoder_state = 1;
1562         return (1);
1563 notsupported:
1564         TIFFErrorExt(tif->tif_clientdata, module,
1565             "SGILog compression supported only for %s, or raw data",
1566             td->td_photometric == PHOTOMETRIC_LOGL ? "Y, L" : "XYZ, Luv");
1567         return (0);
1568 }
1569
1570 static void
1571 LogLuvClose(TIFF* tif)
1572 {
1573         LogLuvState* sp = (LogLuvState*) tif->tif_data;
1574         TIFFDirectory *td = &tif->tif_dir;
1575
1576         assert(sp != 0);
1577         /*
1578          * For consistency, we always want to write out the same
1579          * bitspersample and sampleformat for our TIFF file,
1580          * regardless of the data format being used by the application.
1581          * Since this routine is called after tags have been set but
1582          * before they have been recorded in the file, we reset them here.
1583          * Note: this is really a nasty approach. See PixarLogClose
1584          */
1585         if( sp->encoder_state )
1586         {
1587             /* See PixarLogClose. Might avoid issues with tags whose size depends
1588              * on those below, but not completely sure this is enough. */
1589             td->td_samplesperpixel =
1590                 (td->td_photometric == PHOTOMETRIC_LOGL) ? 1 : 3;
1591             td->td_bitspersample = 16;
1592             td->td_sampleformat = SAMPLEFORMAT_INT;
1593         }
1594 }
1595
1596 static void
1597 LogLuvCleanup(TIFF* tif)
1598 {
1599         LogLuvState* sp = (LogLuvState *)tif->tif_data;
1600
1601         assert(sp != 0);
1602
1603         tif->tif_tagmethods.vgetfield = sp->vgetparent;
1604         tif->tif_tagmethods.vsetfield = sp->vsetparent;
1605
1606         if (sp->tbuf)
1607                 _TIFFfree(sp->tbuf);
1608         _TIFFfree(sp);
1609         tif->tif_data = NULL;
1610
1611         _TIFFSetDefaultCompressionState(tif);
1612 }
1613
1614 static int
1615 LogLuvVSetField(TIFF* tif, uint32 tag, va_list ap)
1616 {
1617         static const char module[] = "LogLuvVSetField";
1618         LogLuvState* sp = DecoderState(tif);
1619         int bps, fmt;
1620
1621         switch (tag) {
1622         case TIFFTAG_SGILOGDATAFMT:
1623                 sp->user_datafmt = (int) va_arg(ap, int);
1624                 /*
1625                  * Tweak the TIFF header so that the rest of libtiff knows what
1626                  * size of data will be passed between app and library, and
1627                  * assume that the app knows what it is doing and is not
1628                  * confused by these header manipulations...
1629                  */
1630                 switch (sp->user_datafmt) {
1631                 case SGILOGDATAFMT_FLOAT:
1632                         bps = 32;
1633                         fmt = SAMPLEFORMAT_IEEEFP;
1634                         break;
1635                 case SGILOGDATAFMT_16BIT:
1636                         bps = 16;
1637                         fmt = SAMPLEFORMAT_INT;
1638                         break;
1639                 case SGILOGDATAFMT_RAW:
1640                         bps = 32;
1641                         fmt = SAMPLEFORMAT_UINT;
1642                         TIFFSetField(tif, TIFFTAG_SAMPLESPERPIXEL, 1);
1643                         break;
1644                 case SGILOGDATAFMT_8BIT:
1645                         bps = 8;
1646                         fmt = SAMPLEFORMAT_UINT;
1647                         break;
1648                 default:
1649                         TIFFErrorExt(tif->tif_clientdata, tif->tif_name,
1650                             "Unknown data format %d for LogLuv compression",
1651                             sp->user_datafmt);
1652                         return (0);
1653                 }
1654                 TIFFSetField(tif, TIFFTAG_BITSPERSAMPLE, bps);
1655                 TIFFSetField(tif, TIFFTAG_SAMPLEFORMAT, fmt);
1656                 /*
1657                  * Must recalculate sizes should bits/sample change.
1658                  */
1659                 tif->tif_tilesize = isTiled(tif) ? TIFFTileSize(tif) : (tmsize_t) -1;
1660                 tif->tif_scanlinesize = TIFFScanlineSize(tif);
1661                 return (1);
1662         case TIFFTAG_SGILOGENCODE:
1663                 sp->encode_meth = (int) va_arg(ap, int);
1664                 if (sp->encode_meth != SGILOGENCODE_NODITHER &&
1665                     sp->encode_meth != SGILOGENCODE_RANDITHER) {
1666                         TIFFErrorExt(tif->tif_clientdata, module,
1667                             "Unknown encoding %d for LogLuv compression",
1668                             sp->encode_meth);
1669                         return (0);
1670                 }
1671                 return (1);
1672         default:
1673                 return (*sp->vsetparent)(tif, tag, ap);
1674         }
1675 }
1676
1677 static int
1678 LogLuvVGetField(TIFF* tif, uint32 tag, va_list ap)
1679 {
1680         LogLuvState *sp = (LogLuvState *)tif->tif_data;
1681
1682         switch (tag) {
1683         case TIFFTAG_SGILOGDATAFMT:
1684                 *va_arg(ap, int*) = sp->user_datafmt;
1685                 return (1);
1686         default:
1687                 return (*sp->vgetparent)(tif, tag, ap);
1688         }
1689 }
1690
1691 static const TIFFField LogLuvFields[] = {
1692     { TIFFTAG_SGILOGDATAFMT, 0, 0, TIFF_SHORT, 0, TIFF_SETGET_INT, TIFF_SETGET_UNDEFINED, FIELD_PSEUDO, TRUE, FALSE, "SGILogDataFmt", NULL},
1693     { TIFFTAG_SGILOGENCODE, 0, 0, TIFF_SHORT, 0, TIFF_SETGET_INT, TIFF_SETGET_UNDEFINED, FIELD_PSEUDO, TRUE, FALSE, "SGILogEncode", NULL}
1694 };
1695
1696 int
1697 TIFFInitSGILog(TIFF* tif, int scheme)
1698 {
1699         static const char module[] = "TIFFInitSGILog";
1700         LogLuvState* sp;
1701
1702         assert(scheme == COMPRESSION_SGILOG24 || scheme == COMPRESSION_SGILOG);
1703
1704         /*
1705          * Merge codec-specific tag information.
1706          */
1707         if (!_TIFFMergeFields(tif, LogLuvFields,
1708                               TIFFArrayCount(LogLuvFields))) {
1709                 TIFFErrorExt(tif->tif_clientdata, module,
1710                     "Merging SGILog codec-specific tags failed");
1711                 return 0;
1712         }
1713
1714         /*
1715          * Allocate state block so tag methods have storage to record values.
1716          */
1717         tif->tif_data = (uint8*) _TIFFmalloc(sizeof (LogLuvState));
1718         if (tif->tif_data == NULL)
1719                 goto bad;
1720         sp = (LogLuvState*) tif->tif_data;
1721         _TIFFmemset((void*)sp, 0, sizeof (*sp));
1722         sp->user_datafmt = SGILOGDATAFMT_UNKNOWN;
1723         sp->encode_meth = (scheme == COMPRESSION_SGILOG24) ?
1724             SGILOGENCODE_RANDITHER : SGILOGENCODE_NODITHER;
1725         sp->tfunc = _logLuvNop;
1726
1727         /*
1728          * Install codec methods.
1729          * NB: tif_decoderow & tif_encoderow are filled
1730          *     in at setup time.
1731          */
1732         tif->tif_fixuptags = LogLuvFixupTags;
1733         tif->tif_setupdecode = LogLuvSetupDecode;
1734         tif->tif_decodestrip = LogLuvDecodeStrip;
1735         tif->tif_decodetile = LogLuvDecodeTile;
1736         tif->tif_setupencode = LogLuvSetupEncode;
1737         tif->tif_encodestrip = LogLuvEncodeStrip;
1738         tif->tif_encodetile = LogLuvEncodeTile;
1739         tif->tif_close = LogLuvClose;
1740         tif->tif_cleanup = LogLuvCleanup;
1741
1742         /*
1743          * Override parent get/set field methods.
1744          */
1745         sp->vgetparent = tif->tif_tagmethods.vgetfield;
1746         tif->tif_tagmethods.vgetfield = LogLuvVGetField;   /* hook for codec tags */
1747         sp->vsetparent = tif->tif_tagmethods.vsetfield;
1748         tif->tif_tagmethods.vsetfield = LogLuvVSetField;   /* hook for codec tags */
1749
1750         return (1);
1751 bad:
1752         TIFFErrorExt(tif->tif_clientdata, module,
1753                      "%s: No space for LogLuv state block", tif->tif_name);
1754         return (0);
1755 }
1756 #endif /* LOGLUV_SUPPORT */
1757
1758 /* vim: set ts=8 sts=8 sw=8 noet: */
1759 /*
1760  * Local Variables:
1761  * mode: c
1762  * c-basic-offset: 8
1763  * fill-column: 78
1764  * End:
1765  */