1 /* 2 * Copyright (c) 1997 Greg Ward Larson 3 * Copyright (c) 1997 Silicon Graphics, Inc. 4 * 5 * Permission to use, copy, modify, distribute, and sell this software and 6 * its documentation for any purpose is hereby granted without fee, provided 7 * that (i) the above copyright notices and this permission notice appear in 8 * all copies of the software and related documentation, and (ii) the names of 9 * Sam Leffler, Greg Larson and Silicon Graphics may not be used in any 10 * advertising or publicity relating to the software without the specific, 11 * prior written permission of Sam Leffler, Greg Larson and Silicon Graphics. 12 * 13 * THE SOFTWARE IS PROVIDED "AS-IS" AND WITHOUT WARRANTY OF ANY KIND, 14 * EXPRESS, IMPLIED OR OTHERWISE, INCLUDING WITHOUT LIMITATION, ANY 15 * WARRANTY OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE. 16 * 17 * IN NO EVENT SHALL SAM LEFFLER, GREG LARSON OR SILICON GRAPHICS BE LIABLE 18 * FOR ANY SPECIAL, INCIDENTAL, INDIRECT OR CONSEQUENTIAL DAMAGES OF ANY KIND, 19 * OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, 20 * WHETHER OR NOT ADVISED OF THE POSSIBILITY OF DAMAGE, AND ON ANY THEORY OF 21 * LIABILITY, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE 22 * OF THIS SOFTWARE. 23 */ 24 25 #include <precomp.h> 26 #ifdef LOGLUV_SUPPORT 27 28 /* 29 * TIFF Library. 30 * LogLuv compression support for high dynamic range images. 31 * 32 * Contributed by Greg Larson. 33 * 34 * LogLuv image support uses the TIFF library to store 16 or 10-bit 35 * log luminance values with 8 bits each of u and v or a 14-bit index. 36 * 37 * The codec can take as input and produce as output 32-bit IEEE float values 38 * as well as 16-bit integer values. A 16-bit luminance is interpreted 39 * as a sign bit followed by a 15-bit integer that is converted 40 * to and from a linear magnitude using the transformation: 41 * 42 * L = 2^( (Le+.5)/256 - 64 ) # real from 15-bit 43 * 44 * Le = floor( 256*(log2(L) + 64) ) # 15-bit from real 45 * 46 * The actual conversion to world luminance units in candelas per sq. meter 47 * requires an additional multiplier, which is stored in the TIFFTAG_STONITS. 48 * This value is usually set such that a reasonable exposure comes from 49 * clamping decoded luminances above 1 to 1 in the displayed image. 50 * 51 * The 16-bit values for u and v may be converted to real values by dividing 52 * each by 32768. (This allows for negative values, which aren't useful as 53 * far as we know, but are left in case of future improvements in human 54 * 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: 58 * 59 * u = 4*x / (-2*x + 12*y + 3) 60 * v = 9*y / (-2*x + 12*y + 3) 61 * 62 * x = 9*u / (6*u - 16*v + 12) 63 * y = 4*v / (6*u - 16*v + 12) 64 * 65 * This process is greatly simplified by passing 32-bit IEEE floats 66 * for each of three CIE XYZ coordinates. The codec then takes care 67 * of conversion to and from LogLuv, though the application is still 68 * responsible for interpreting the TIFFTAG_STONITS calibration factor. 69 * 70 * By definition, a CIE XYZ vector of [1 1 1] corresponds to a neutral white 71 * point of (x,y)=(1/3,1/3). However, most color systems assume some other 72 * white point, such as D65, and an absolute color conversion to XYZ then 73 * to another color space with a different white point may introduce an 74 * unwanted color cast to the image. It is often desirable, therefore, to 75 * perform a white point conversion that maps the input white to [1 1 1] 76 * in XYZ, then record the original white point using the TIFFTAG_WHITEPOINT 77 * tag value. A decoder that demands absolute color calibration may use 78 * this white point tag to get back the original colors, but usually it 79 * will be ignored and the new white point will be used instead that 80 * matches the output color space. 81 * 82 * Pixel information is compressed into one of two basic encodings, depending 83 * on the setting of the compression tag, which is one of COMPRESSION_SGILOG 84 * or COMPRESSION_SGILOG24. For COMPRESSION_SGILOG, greyscale data is 85 * stored as: 86 * 87 * 1 15 88 * |-+---------------| 89 * 90 * COMPRESSION_SGILOG color data is stored as: 91 * 92 * 1 15 8 8 93 * |-+---------------|--------+--------| 94 * S Le ue ve 95 * 96 * For the 24-bit COMPRESSION_SGILOG24 color format, the data is stored as: 97 * 98 * 10 14 99 * |----------|--------------| 100 * Le' Ce 101 * 102 * There is no sign bit in the 24-bit case, and the (u,v) chromaticity is 103 * encoded as an index for optimal color resolution. The 10 log bits are 104 * defined by the following conversions: 105 * 106 * L = 2^((Le'+.5)/64 - 12) # real from 10-bit 107 * 108 * Le' = floor( 64*(log2(L) + 12) ) # 10-bit from real 109 * 110 * The 10 bits of the smaller format may be converted into the 15 bits of 111 * the larger format by multiplying by 4 and adding 13314. Obviously, 112 * a smaller range of magnitudes is covered (about 5 orders of magnitude 113 * 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, 115 * but they are useful for certain types of image processing.) 116 * 117 * The desired user format is controlled by the setting the internal 118 * pseudo tag TIFFTAG_SGILOGDATAFMT to one of: 119 * SGILOGDATAFMT_FLOAT = IEEE 32-bit float XYZ values 120 * SGILOGDATAFMT_16BIT = 16-bit integer encodings of logL, u and v 121 * Raw data i/o is also possible using: 122 * SGILOGDATAFMT_RAW = 32-bit unsigned integer with encoded pixel 123 * In addition, the following decoding is provided for ease of display: 124 * SGILOGDATAFMT_8BIT = 8-bit default RGB gamma-corrected values 125 * 126 * For grayscale images, we provide the following data formats: 127 * SGILOGDATAFMT_FLOAT = IEEE 32-bit float Y values 128 * SGILOGDATAFMT_16BIT = 16-bit integer w/ encoded luminance 129 * SGILOGDATAFMT_8BIT = 8-bit gray monitor values 130 * 131 * Note that the COMPRESSION_SGILOG applies a simple run-length encoding 132 * scheme by separating the logL, u and v bytes for each row and applying 133 * a PackBits type of compression. Since the 24-bit encoding is not 134 * adaptive, the 32-bit color format takes less space in many cases. 135 * 136 * Further control is provided over the conversion from higher-resolution 137 * formats to final encoded values through the pseudo tag 138 * TIFFTAG_SGILOGENCODE: 139 * SGILOGENCODE_NODITHER = do not dither encoded values 140 * SGILOGENCODE_RANDITHER = apply random dithering during encoding 141 * 142 * The default value of this tag is SGILOGENCODE_NODITHER for 143 * COMPRESSION_SGILOG to maximize run-length encoding and 144 * SGILOGENCODE_RANDITHER for COMPRESSION_SGILOG24 to turn 145 * quantization errors into noise. 146 */ 147 148 #include <stdio.h> 149 #include <stdlib.h> 150 #include <math.h> 151 152 /* 153 * State block for each open TIFF 154 * file using LogLuv compression/decompression. 155 */ 156 typedef struct logLuvState LogLuvState; 157 158 struct logLuvState { 159 int encoder_state; /* 1 if encoder correctly initialized */ 160 int user_datafmt; /* user data format */ 161 int encode_meth; /* encoding method */ 162 int pixel_size; /* bytes per pixel */ 163 164 uint8* tbuf; /* translation buffer */ 165 tmsize_t tbuflen; /* buffer length */ 166 void (*tfunc)(LogLuvState*, uint8*, tmsize_t); 167 168 TIFFVSetMethod vgetparent; /* super-class method */ 169 TIFFVSetMethod vsetparent; /* super-class method */ 170 }; 171 172 #define DecoderState(tif) ((LogLuvState*) (tif)->tif_data) 173 #define EncoderState(tif) ((LogLuvState*) (tif)->tif_data) 174 175 #define SGILOGDATAFMT_UNKNOWN -1 176 177 #define MINRUN 4 /* minimum run length */ 178 179 /* 180 * Decode a string of 16-bit gray pixels. 181 */ 182 static int 183 LogL16Decode(TIFF* tif, uint8* op, tmsize_t occ, uint16 s) 184 { 185 static const char module[] = "LogL16Decode"; 186 LogLuvState* sp = DecoderState(tif); 187 int shft; 188 tmsize_t i; 189 tmsize_t npixels; 190 unsigned char* bp; 191 int16* tp; 192 int16 b; 193 tmsize_t cc; 194 int rc; 195 196 assert(s == 0); 197 assert(sp != NULL); 198 199 npixels = occ / sp->pixel_size; 200 201 if (sp->user_datafmt == SGILOGDATAFMT_16BIT) 202 tp = (int16*) op; 203 else { 204 if(sp->tbuflen < npixels) { 205 TIFFErrorExt(tif->tif_clientdata, module, 206 "Translation buffer too short"); 207 return (0); 208 } 209 tp = (int16*) sp->tbuf; 210 } 211 _TIFFmemset((void*) tp, 0, npixels*sizeof (tp[0])); 212 213 bp = (unsigned char*) tif->tif_rawcp; 214 cc = tif->tif_rawcc; 215 /* get each byte string */ 216 for (shft = 8; shft >= 0; shft -=8) { 217 for (i = 0; i < npixels && cc > 0; ) { 218 if (*bp >= 128) { /* run */ 219 if( cc < 2 ) 220 break; 221 rc = *bp++ + (2-128); 222 b = (int16)(*bp++ << shft); 223 cc -= 2; 224 while (rc-- && i < npixels) 225 tp[i++] |= b; 226 } else { /* non-run */ 227 rc = *bp++; /* nul is noop */ 228 while (--cc && rc-- && i < npixels) 229 tp[i++] |= (int16)*bp++ << shft; 230 } 231 } 232 if (i != npixels) { 233 #if defined(__WIN32__) && (defined(_MSC_VER) || defined(__MINGW32__)) 234 TIFFErrorExt(tif->tif_clientdata, module, 235 "Not enough data at row %lu (short %I64d pixels)", 236 (unsigned long) tif->tif_row, 237 (unsigned __int64) (npixels - i)); 238 #else 239 TIFFErrorExt(tif->tif_clientdata, module, 240 "Not enough data at row %lu (short %llu pixels)", 241 (unsigned long) tif->tif_row, 242 (unsigned long long) (npixels - i)); 243 #endif 244 tif->tif_rawcp = (uint8*) bp; 245 tif->tif_rawcc = cc; 246 return (0); 247 } 248 } 249 (*sp->tfunc)(sp, op, npixels); 250 tif->tif_rawcp = (uint8*) bp; 251 tif->tif_rawcc = cc; 252 return (1); 253 } 254 255 /* 256 * Decode a string of 24-bit pixels. 257 */ 258 static int 259 LogLuvDecode24(TIFF* tif, uint8* op, tmsize_t occ, uint16 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* tp; 268 269 assert(s == 0); 270 assert(sp != NULL); 271 272 npixels = occ / sp->pixel_size; 273 274 if (sp->user_datafmt == SGILOGDATAFMT_RAW) 275 tp = (uint32 *)op; 276 else { 277 if(sp->tbuflen < npixels) { 278 TIFFErrorExt(tif->tif_clientdata, module, 279 "Translation buffer too short"); 280 return (0); 281 } 282 tp = (uint32 *) sp->tbuf; 283 } 284 /* copy to array of uint32 */ 285 bp = (unsigned char*) tif->tif_rawcp; 286 cc = tif->tif_rawcc; 287 for (i = 0; i < npixels && cc >= 3; i++) { 288 tp[i] = bp[0] << 16 | bp[1] << 8 | bp[2]; 289 bp += 3; 290 cc -= 3; 291 } 292 tif->tif_rawcp = (uint8*) bp; 293 tif->tif_rawcc = cc; 294 if (i != npixels) { 295 #if defined(__WIN32__) && (defined(_MSC_VER) || defined(__MINGW32__)) 296 TIFFErrorExt(tif->tif_clientdata, module, 297 "Not enough data at row %lu (short %I64d pixels)", 298 (unsigned long) tif->tif_row, 299 (unsigned __int64) (npixels - i)); 300 #else 301 TIFFErrorExt(tif->tif_clientdata, module, 302 "Not enough data at row %lu (short %llu pixels)", 303 (unsigned long) tif->tif_row, 304 (unsigned long long) (npixels - i)); 305 #endif 306 return (0); 307 } 308 (*sp->tfunc)(sp, op, npixels); 309 return (1); 310 } 311 312 /* 313 * Decode a string of 32-bit pixels. 314 */ 315 static int 316 LogLuvDecode32(TIFF* tif, uint8* op, tmsize_t occ, uint16 s) 317 { 318 static const char module[] = "LogLuvDecode32"; 319 LogLuvState* sp; 320 int shft; 321 tmsize_t i; 322 tmsize_t npixels; 323 unsigned char* bp; 324 uint32* tp; 325 uint32 b; 326 tmsize_t cc; 327 int rc; 328 329 assert(s == 0); 330 sp = DecoderState(tif); 331 assert(sp != NULL); 332 333 npixels = occ / sp->pixel_size; 334 335 if (sp->user_datafmt == SGILOGDATAFMT_RAW) 336 tp = (uint32*) op; 337 else { 338 if(sp->tbuflen < npixels) { 339 TIFFErrorExt(tif->tif_clientdata, module, 340 "Translation buffer too short"); 341 return (0); 342 } 343 tp = (uint32*) sp->tbuf; 344 } 345 _TIFFmemset((void*) tp, 0, npixels*sizeof (tp[0])); 346 347 bp = (unsigned char*) tif->tif_rawcp; 348 cc = tif->tif_rawcc; 349 /* get each byte string */ 350 for (shft = 24; shft >= 0; shft -=8) { 351 for (i = 0; i < npixels && cc > 0; ) { 352 if (*bp >= 128) { /* run */ 353 if( cc < 2 ) 354 break; 355 rc = *bp++ + (2-128); 356 b = (uint32)*bp++ << shft; 357 cc -= 2; 358 while (rc-- && i < npixels) 359 tp[i++] |= b; 360 } else { /* non-run */ 361 rc = *bp++; /* nul is noop */ 362 while (--cc && rc-- && i < npixels) 363 tp[i++] |= (uint32)*bp++ << shft; 364 } 365 } 366 if (i != npixels) { 367 #if defined(__WIN32__) && (defined(_MSC_VER) || defined(__MINGW32__)) 368 TIFFErrorExt(tif->tif_clientdata, module, 369 "Not enough data at row %lu (short %I64d pixels)", 370 (unsigned long) tif->tif_row, 371 (unsigned __int64) (npixels - i)); 372 #else 373 TIFFErrorExt(tif->tif_clientdata, module, 374 "Not enough data at row %lu (short %llu pixels)", 375 (unsigned long) tif->tif_row, 376 (unsigned long long) (npixels - i)); 377 #endif 378 tif->tif_rawcp = (uint8*) bp; 379 tif->tif_rawcc = cc; 380 return (0); 381 } 382 } 383 (*sp->tfunc)(sp, op, npixels); 384 tif->tif_rawcp = (uint8*) bp; 385 tif->tif_rawcc = cc; 386 return (1); 387 } 388 389 /* 390 * Decode a strip of pixels. We break it into rows to 391 * maintain synchrony with the encode algorithm, which 392 * is row by row. 393 */ 394 static int 395 LogLuvDecodeStrip(TIFF* tif, uint8* bp, tmsize_t cc, uint16 s) 396 { 397 tmsize_t rowlen = TIFFScanlineSize(tif); 398 399 if (rowlen == 0) 400 return 0; 401 402 assert(cc%rowlen == 0); 403 while (cc && (*tif->tif_decoderow)(tif, bp, rowlen, s)) { 404 bp += rowlen; 405 cc -= rowlen; 406 } 407 return (cc == 0); 408 } 409 410 /* 411 * Decode a tile of pixels. We break it into rows to 412 * maintain synchrony with the encode algorithm, which 413 * is row by row. 414 */ 415 static int 416 LogLuvDecodeTile(TIFF* tif, uint8* bp, tmsize_t cc, uint16 s) 417 { 418 tmsize_t rowlen = TIFFTileRowSize(tif); 419 420 if (rowlen == 0) 421 return 0; 422 423 assert(cc%rowlen == 0); 424 while (cc && (*tif->tif_decoderow)(tif, bp, rowlen, s)) { 425 bp += rowlen; 426 cc -= rowlen; 427 } 428 return (cc == 0); 429 } 430 431 /* 432 * Encode a row of 16-bit pixels. 433 */ 434 static int 435 LogL16Encode(TIFF* tif, uint8* bp, tmsize_t cc, uint16 s) 436 { 437 static const char module[] = "LogL16Encode"; 438 LogLuvState* sp = EncoderState(tif); 439 int shft; 440 tmsize_t i; 441 tmsize_t j; 442 tmsize_t npixels; 443 uint8* op; 444 int16* tp; 445 int16 b; 446 tmsize_t occ; 447 int rc=0, mask; 448 tmsize_t beg; 449 450 assert(s == 0); 451 assert(sp != NULL); 452 npixels = cc / sp->pixel_size; 453 454 if (sp->user_datafmt == SGILOGDATAFMT_16BIT) 455 tp = (int16*) bp; 456 else { 457 tp = (int16*) sp->tbuf; 458 if(sp->tbuflen < npixels) { 459 TIFFErrorExt(tif->tif_clientdata, module, 460 "Translation buffer too short"); 461 return (0); 462 } 463 (*sp->tfunc)(sp, bp, npixels); 464 } 465 /* compress each byte string */ 466 op = tif->tif_rawcp; 467 occ = tif->tif_rawdatasize - tif->tif_rawcc; 468 for (shft = 8; shft >= 0; shft -=8) { 469 for (i = 0; i < npixels; i += rc) { 470 if (occ < 4) { 471 tif->tif_rawcp = op; 472 tif->tif_rawcc = tif->tif_rawdatasize - occ; 473 if (!TIFFFlushData1(tif)) 474 return (0); 475 op = tif->tif_rawcp; 476 occ = tif->tif_rawdatasize - tif->tif_rawcc; 477 } 478 mask = 0xff << shft; /* find next run */ 479 for (beg = i; beg < npixels; beg += rc) { 480 b = (int16) (tp[beg] & mask); 481 rc = 1; 482 while (rc < 127+2 && beg+rc < npixels && 483 (tp[beg+rc] & mask) == b) 484 rc++; 485 if (rc >= MINRUN) 486 break; /* long enough */ 487 } 488 if (beg-i > 1 && beg-i < MINRUN) { 489 b = (int16) (tp[i] & mask);/*check short run */ 490 j = i+1; 491 while ((tp[j++] & mask) == b) 492 if (j == beg) { 493 *op++ = (uint8)(128-2+j-i); 494 *op++ = (uint8)(b >> shft); 495 occ -= 2; 496 i = beg; 497 break; 498 } 499 } 500 while (i < beg) { /* write out non-run */ 501 if ((j = beg-i) > 127) j = 127; 502 if (occ < j+3) { 503 tif->tif_rawcp = op; 504 tif->tif_rawcc = tif->tif_rawdatasize - occ; 505 if (!TIFFFlushData1(tif)) 506 return (0); 507 op = tif->tif_rawcp; 508 occ = tif->tif_rawdatasize - tif->tif_rawcc; 509 } 510 *op++ = (uint8) j; occ--; 511 while (j--) { 512 *op++ = (uint8) (tp[i++] >> shft & 0xff); 513 occ--; 514 } 515 } 516 if (rc >= MINRUN) { /* write out run */ 517 *op++ = (uint8) (128-2+rc); 518 *op++ = (uint8) (tp[beg] >> shft & 0xff); 519 occ -= 2; 520 } else 521 rc = 0; 522 } 523 } 524 tif->tif_rawcp = op; 525 tif->tif_rawcc = tif->tif_rawdatasize - occ; 526 527 return (1); 528 } 529 530 /* 531 * Encode a row of 24-bit pixels. 532 */ 533 static int 534 LogLuvEncode24(TIFF* tif, uint8* bp, tmsize_t cc, uint16 s) 535 { 536 static const char module[] = "LogLuvEncode24"; 537 LogLuvState* sp = EncoderState(tif); 538 tmsize_t i; 539 tmsize_t npixels; 540 tmsize_t occ; 541 uint8* op; 542 uint32* tp; 543 544 assert(s == 0); 545 assert(sp != NULL); 546 npixels = cc / sp->pixel_size; 547 548 if (sp->user_datafmt == SGILOGDATAFMT_RAW) 549 tp = (uint32*) bp; 550 else { 551 tp = (uint32*) sp->tbuf; 552 if(sp->tbuflen < npixels) { 553 TIFFErrorExt(tif->tif_clientdata, module, 554 "Translation buffer too short"); 555 return (0); 556 } 557 (*sp->tfunc)(sp, bp, npixels); 558 } 559 /* write out encoded pixels */ 560 op = tif->tif_rawcp; 561 occ = tif->tif_rawdatasize - tif->tif_rawcc; 562 for (i = npixels; i--; ) { 563 if (occ < 3) { 564 tif->tif_rawcp = op; 565 tif->tif_rawcc = tif->tif_rawdatasize - occ; 566 if (!TIFFFlushData1(tif)) 567 return (0); 568 op = tif->tif_rawcp; 569 occ = tif->tif_rawdatasize - tif->tif_rawcc; 570 } 571 *op++ = (uint8)(*tp >> 16); 572 *op++ = (uint8)(*tp >> 8 & 0xff); 573 *op++ = (uint8)(*tp++ & 0xff); 574 occ -= 3; 575 } 576 tif->tif_rawcp = op; 577 tif->tif_rawcc = tif->tif_rawdatasize - occ; 578 579 return (1); 580 } 581 582 /* 583 * Encode a row of 32-bit pixels. 584 */ 585 static int 586 LogLuvEncode32(TIFF* tif, uint8* bp, tmsize_t cc, uint16 s) 587 { 588 static const char module[] = "LogLuvEncode32"; 589 LogLuvState* sp = EncoderState(tif); 590 int shft; 591 tmsize_t i; 592 tmsize_t j; 593 tmsize_t npixels; 594 uint8* op; 595 uint32* tp; 596 uint32 b; 597 tmsize_t occ; 598 int rc=0, mask; 599 tmsize_t beg; 600 601 assert(s == 0); 602 assert(sp != NULL); 603 604 npixels = cc / sp->pixel_size; 605 606 if (sp->user_datafmt == SGILOGDATAFMT_RAW) 607 tp = (uint32*) bp; 608 else { 609 tp = (uint32*) sp->tbuf; 610 if(sp->tbuflen < npixels) { 611 TIFFErrorExt(tif->tif_clientdata, module, 612 "Translation buffer too short"); 613 return (0); 614 } 615 (*sp->tfunc)(sp, bp, npixels); 616 } 617 /* compress each byte string */ 618 op = tif->tif_rawcp; 619 occ = tif->tif_rawdatasize - tif->tif_rawcc; 620 for (shft = 24; shft >= 0; shft -=8) { 621 for (i = 0; i < npixels; i += rc) { 622 if (occ < 4) { 623 tif->tif_rawcp = op; 624 tif->tif_rawcc = tif->tif_rawdatasize - occ; 625 if (!TIFFFlushData1(tif)) 626 return (0); 627 op = tif->tif_rawcp; 628 occ = tif->tif_rawdatasize - tif->tif_rawcc; 629 } 630 mask = 0xff << shft; /* find next run */ 631 for (beg = i; beg < npixels; beg += rc) { 632 b = tp[beg] & mask; 633 rc = 1; 634 while (rc < 127+2 && beg+rc < npixels && 635 (tp[beg+rc] & mask) == b) 636 rc++; 637 if (rc >= MINRUN) 638 break; /* long enough */ 639 } 640 if (beg-i > 1 && beg-i < MINRUN) { 641 b = tp[i] & mask; /* check short run */ 642 j = i+1; 643 while ((tp[j++] & mask) == b) 644 if (j == beg) { 645 *op++ = (uint8)(128-2+j-i); 646 *op++ = (uint8)(b >> shft); 647 occ -= 2; 648 i = beg; 649 break; 650 } 651 } 652 while (i < beg) { /* write out non-run */ 653 if ((j = beg-i) > 127) j = 127; 654 if (occ < j+3) { 655 tif->tif_rawcp = op; 656 tif->tif_rawcc = tif->tif_rawdatasize - occ; 657 if (!TIFFFlushData1(tif)) 658 return (0); 659 op = tif->tif_rawcp; 660 occ = tif->tif_rawdatasize - tif->tif_rawcc; 661 } 662 *op++ = (uint8) j; occ--; 663 while (j--) { 664 *op++ = (uint8)(tp[i++] >> shft & 0xff); 665 occ--; 666 } 667 } 668 if (rc >= MINRUN) { /* write out run */ 669 *op++ = (uint8) (128-2+rc); 670 *op++ = (uint8)(tp[beg] >> shft & 0xff); 671 occ -= 2; 672 } else 673 rc = 0; 674 } 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 static int itrunc(double x, int m) 746 { 747 if( m == SGILOGENCODE_NODITHER ) 748 return (int)x; 749 /* Silence CoverityScan warning about bad crypto function */ 750 /* coverity[dont_call] */ 751 return (int)(x + rand()*(1./RAND_MAX) - .5); 752 } 753 754 #if !LOGLUV_PUBLIC 755 static 756 #endif 757 double 758 LogL16toY(int p16) /* compute luminance from 16-bit LogL */ 759 { 760 int Le = p16 & 0x7fff; 761 double Y; 762 763 if (!Le) 764 return (0.); 765 Y = exp(M_LN2/256.*(Le+.5) - M_LN2*64.); 766 return (!(p16 & 0x8000) ? Y : -Y); 767 } 768 769 #if !LOGLUV_PUBLIC 770 static 771 #endif 772 int 773 LogL16fromY(double Y, int em) /* get 16-bit LogL from Y */ 774 { 775 if (Y >= 1.8371976e19) 776 return (0x7fff); 777 if (Y <= -1.8371976e19) 778 return (0xffff); 779 if (Y > 5.4136769e-20) 780 return itrunc(256.*(log2(Y) + 64.), em); 781 if (Y < -5.4136769e-20) 782 return (~0x7fff | itrunc(256.*(log2(-Y) + 64.), em)); 783 return (0); 784 } 785 786 static void 787 L16toY(LogLuvState* sp, uint8* op, tmsize_t n) 788 { 789 int16* l16 = (int16*) sp->tbuf; 790 float* yp = (float*) op; 791 792 while (n-- > 0) 793 *yp++ = (float)LogL16toY(*l16++); 794 } 795 796 static void 797 L16toGry(LogLuvState* sp, uint8* op, tmsize_t n) 798 { 799 int16* l16 = (int16*) sp->tbuf; 800 uint8* gp = (uint8*) op; 801 802 while (n-- > 0) { 803 double Y = LogL16toY(*l16++); 804 *gp++ = (uint8) ((Y <= 0.) ? 0 : (Y >= 1.) ? 255 : (int)(256.*sqrt(Y))); 805 } 806 } 807 808 static void 809 L16fromY(LogLuvState* sp, uint8* op, tmsize_t n) 810 { 811 int16* l16 = (int16*) sp->tbuf; 812 float* yp = (float*) op; 813 814 while (n-- > 0) 815 *l16++ = (int16) (LogL16fromY(*yp++, sp->encode_meth)); 816 } 817 818 #if !LOGLUV_PUBLIC 819 static 820 #endif 821 void 822 XYZtoRGB24(float xyz[3], uint8 rgb[3]) 823 { 824 double r, g, b; 825 /* assume CCIR-709 primaries */ 826 r = 2.690*xyz[0] + -1.276*xyz[1] + -0.414*xyz[2]; 827 g = -1.022*xyz[0] + 1.978*xyz[1] + 0.044*xyz[2]; 828 b = 0.061*xyz[0] + -0.224*xyz[1] + 1.163*xyz[2]; 829 /* assume 2.0 gamma for speed */ 830 /* could use integer sqrt approx., but this is probably faster */ 831 rgb[0] = (uint8)((r<=0.) ? 0 : (r >= 1.) ? 255 : (int)(256.*sqrt(r))); 832 rgb[1] = (uint8)((g<=0.) ? 0 : (g >= 1.) ? 255 : (int)(256.*sqrt(g))); 833 rgb[2] = (uint8)((b<=0.) ? 0 : (b >= 1.) ? 255 : (int)(256.*sqrt(b))); 834 } 835 836 #if !LOGLUV_PUBLIC 837 static 838 #endif 839 double 840 LogL10toY(int p10) /* compute luminance from 10-bit LogL */ 841 { 842 if (p10 == 0) 843 return (0.); 844 return (exp(M_LN2/64.*(p10+.5) - M_LN2*12.)); 845 } 846 847 #if !LOGLUV_PUBLIC 848 static 849 #endif 850 int 851 LogL10fromY(double Y, int em) /* get 10-bit LogL from Y */ 852 { 853 if (Y >= 15.742) 854 return (0x3ff); 855 else if (Y <= .00024283) 856 return (0); 857 else 858 return itrunc(64.*(log2(Y) + 12.), em); 859 } 860 861 #define NANGLES 100 862 #define uv2ang(u, v) ( (NANGLES*.499999999/M_PI) \ 863 * atan2((v)-V_NEU,(u)-U_NEU) + .5*NANGLES ) 864 865 static int 866 oog_encode(double u, double v) /* encode out-of-gamut chroma */ 867 { 868 static int oog_table[NANGLES]; 869 static int initialized = 0; 870 register int i; 871 872 if (!initialized) { /* set up perimeter table */ 873 double eps[NANGLES], ua, va, ang, epsa; 874 int ui, vi, ustep; 875 for (i = NANGLES; i--; ) 876 eps[i] = 2.; 877 for (vi = UV_NVS; vi--; ) { 878 va = UV_VSTART + (vi+.5)*UV_SQSIZ; 879 ustep = uv_row[vi].nus-1; 880 if (vi == UV_NVS-1 || vi == 0 || ustep <= 0) 881 ustep = 1; 882 for (ui = uv_row[vi].nus-1; ui >= 0; ui -= ustep) { 883 ua = uv_row[vi].ustart + (ui+.5)*UV_SQSIZ; 884 ang = uv2ang(ua, va); 885 i = (int) ang; 886 epsa = fabs(ang - (i+.5)); 887 if (epsa < eps[i]) { 888 oog_table[i] = uv_row[vi].ncum + ui; 889 eps[i] = epsa; 890 } 891 } 892 } 893 for (i = NANGLES; i--; ) /* fill any holes */ 894 if (eps[i] > 1.5) { 895 int i1, i2; 896 for (i1 = 1; i1 < NANGLES/2; i1++) 897 if (eps[(i+i1)%NANGLES] < 1.5) 898 break; 899 for (i2 = 1; i2 < NANGLES/2; i2++) 900 if (eps[(i+NANGLES-i2)%NANGLES] < 1.5) 901 break; 902 if (i1 < i2) 903 oog_table[i] = 904 oog_table[(i+i1)%NANGLES]; 905 else 906 oog_table[i] = 907 oog_table[(i+NANGLES-i2)%NANGLES]; 908 } 909 initialized = 1; 910 } 911 i = (int) uv2ang(u, v); /* look up hue angle */ 912 return (oog_table[i]); 913 } 914 915 #undef uv2ang 916 #undef NANGLES 917 918 #if !LOGLUV_PUBLIC 919 static 920 #endif 921 int 922 uv_encode(double u, double v, int em) /* encode (u',v') coordinates */ 923 { 924 register int vi, ui; 925 926 if (v < UV_VSTART) 927 return oog_encode(u, v); 928 vi = itrunc((v - UV_VSTART)*(1./UV_SQSIZ), em); 929 if (vi >= UV_NVS) 930 return oog_encode(u, v); 931 if (u < uv_row[vi].ustart) 932 return oog_encode(u, v); 933 ui = itrunc((u - uv_row[vi].ustart)*(1./UV_SQSIZ), em); 934 if (ui >= uv_row[vi].nus) 935 return oog_encode(u, v); 936 937 return (uv_row[vi].ncum + ui); 938 } 939 940 #if !LOGLUV_PUBLIC 941 static 942 #endif 943 int 944 uv_decode(double *up, double *vp, int c) /* decode (u',v') index */ 945 { 946 int upper, lower; 947 register int ui, vi; 948 949 if (c < 0 || c >= UV_NDIVS) 950 return (-1); 951 lower = 0; /* binary search */ 952 upper = UV_NVS; 953 while (upper - lower > 1) { 954 vi = (lower + upper) >> 1; 955 ui = c - uv_row[vi].ncum; 956 if (ui > 0) 957 lower = vi; 958 else if (ui < 0) 959 upper = vi; 960 else { 961 lower = vi; 962 break; 963 } 964 } 965 vi = lower; 966 ui = c - uv_row[vi].ncum; 967 *up = uv_row[vi].ustart + (ui+.5)*UV_SQSIZ; 968 *vp = UV_VSTART + (vi+.5)*UV_SQSIZ; 969 return (0); 970 } 971 972 #if !LOGLUV_PUBLIC 973 static 974 #endif 975 void 976 LogLuv24toXYZ(uint32 p, float XYZ[3]) 977 { 978 int Ce; 979 double L, u, v, s, x, y; 980 /* decode luminance */ 981 L = LogL10toY(p>>14 & 0x3ff); 982 if (L <= 0.) { 983 XYZ[0] = XYZ[1] = XYZ[2] = 0.; 984 return; 985 } 986 /* decode color */ 987 Ce = p & 0x3fff; 988 if (uv_decode(&u, &v, Ce) < 0) { 989 u = U_NEU; v = V_NEU; 990 } 991 s = 1./(6.*u - 16.*v + 12.); 992 x = 9.*u * s; 993 y = 4.*v * s; 994 /* convert to XYZ */ 995 XYZ[0] = (float)(x/y * L); 996 XYZ[1] = (float)L; 997 XYZ[2] = (float)((1.-x-y)/y * L); 998 } 999 1000 #if !LOGLUV_PUBLIC 1001 static 1002 #endif 1003 uint32 1004 LogLuv24fromXYZ(float XYZ[3], int em) 1005 { 1006 int Le, Ce; 1007 double u, v, s; 1008 /* encode luminance */ 1009 Le = LogL10fromY(XYZ[1], em); 1010 /* encode color */ 1011 s = XYZ[0] + 15.*XYZ[1] + 3.*XYZ[2]; 1012 if (!Le || s <= 0.) { 1013 u = U_NEU; 1014 v = V_NEU; 1015 } else { 1016 u = 4.*XYZ[0] / s; 1017 v = 9.*XYZ[1] / s; 1018 } 1019 Ce = uv_encode(u, v, em); 1020 if (Ce < 0) /* never happens */ 1021 Ce = uv_encode(U_NEU, V_NEU, SGILOGENCODE_NODITHER); 1022 /* combine encodings */ 1023 return (Le << 14 | Ce); 1024 } 1025 1026 static void 1027 Luv24toXYZ(LogLuvState* sp, uint8* op, tmsize_t n) 1028 { 1029 uint32* luv = (uint32*) sp->tbuf; 1030 float* xyz = (float*) op; 1031 1032 while (n-- > 0) { 1033 LogLuv24toXYZ(*luv, xyz); 1034 xyz += 3; 1035 luv++; 1036 } 1037 } 1038 1039 static void 1040 Luv24toLuv48(LogLuvState* sp, uint8* op, tmsize_t n) 1041 { 1042 uint32* luv = (uint32*) sp->tbuf; 1043 int16* luv3 = (int16*) op; 1044 1045 while (n-- > 0) { 1046 double u, v; 1047 1048 *luv3++ = (int16)((*luv >> 12 & 0xffd) + 13314); 1049 if (uv_decode(&u, &v, *luv&0x3fff) < 0) { 1050 u = U_NEU; 1051 v = V_NEU; 1052 } 1053 *luv3++ = (int16)(u * (1L<<15)); 1054 *luv3++ = (int16)(v * (1L<<15)); 1055 luv++; 1056 } 1057 } 1058 1059 static void 1060 Luv24toRGB(LogLuvState* sp, uint8* op, tmsize_t n) 1061 { 1062 uint32* luv = (uint32*) sp->tbuf; 1063 uint8* rgb = (uint8*) op; 1064 1065 while (n-- > 0) { 1066 float xyz[3]; 1067 1068 LogLuv24toXYZ(*luv++, xyz); 1069 XYZtoRGB24(xyz, rgb); 1070 rgb += 3; 1071 } 1072 } 1073 1074 static void 1075 Luv24fromXYZ(LogLuvState* sp, uint8* op, tmsize_t n) 1076 { 1077 uint32* luv = (uint32*) sp->tbuf; 1078 float* xyz = (float*) op; 1079 1080 while (n-- > 0) { 1081 *luv++ = LogLuv24fromXYZ(xyz, sp->encode_meth); 1082 xyz += 3; 1083 } 1084 } 1085 1086 static void 1087 Luv24fromLuv48(LogLuvState* sp, uint8* op, tmsize_t n) 1088 { 1089 uint32* luv = (uint32*) sp->tbuf; 1090 int16* luv3 = (int16*) op; 1091 1092 while (n-- > 0) { 1093 int Le, Ce; 1094 1095 if (luv3[0] <= 0) 1096 Le = 0; 1097 else if (luv3[0] >= (1<<12)+3314) 1098 Le = (1<<10) - 1; 1099 else if (sp->encode_meth == SGILOGENCODE_NODITHER) 1100 Le = (luv3[0]-3314) >> 2; 1101 else 1102 Le = itrunc(.25*(luv3[0]-3314.), sp->encode_meth); 1103 1104 Ce = uv_encode((luv3[1]+.5)/(1<<15), (luv3[2]+.5)/(1<<15), 1105 sp->encode_meth); 1106 if (Ce < 0) /* never happens */ 1107 Ce = uv_encode(U_NEU, V_NEU, SGILOGENCODE_NODITHER); 1108 *luv++ = (uint32)Le << 14 | Ce; 1109 luv3 += 3; 1110 } 1111 } 1112 1113 #if !LOGLUV_PUBLIC 1114 static 1115 #endif 1116 void 1117 LogLuv32toXYZ(uint32 p, float XYZ[3]) 1118 { 1119 double L, u, v, s, x, y; 1120 /* decode luminance */ 1121 L = LogL16toY((int)p >> 16); 1122 if (L <= 0.) { 1123 XYZ[0] = XYZ[1] = XYZ[2] = 0.; 1124 return; 1125 } 1126 /* decode color */ 1127 u = 1./UVSCALE * ((p>>8 & 0xff) + .5); 1128 v = 1./UVSCALE * ((p & 0xff) + .5); 1129 s = 1./(6.*u - 16.*v + 12.); 1130 x = 9.*u * s; 1131 y = 4.*v * s; 1132 /* convert to XYZ */ 1133 XYZ[0] = (float)(x/y * L); 1134 XYZ[1] = (float)L; 1135 XYZ[2] = (float)((1.-x-y)/y * L); 1136 } 1137 1138 #if !LOGLUV_PUBLIC 1139 static 1140 #endif 1141 uint32 1142 LogLuv32fromXYZ(float XYZ[3], int em) 1143 { 1144 unsigned int Le, ue, ve; 1145 double u, v, s; 1146 /* encode luminance */ 1147 Le = (unsigned int)LogL16fromY(XYZ[1], em); 1148 /* encode color */ 1149 s = XYZ[0] + 15.*XYZ[1] + 3.*XYZ[2]; 1150 if (!Le || s <= 0.) { 1151 u = U_NEU; 1152 v = V_NEU; 1153 } else { 1154 u = 4.*XYZ[0] / s; 1155 v = 9.*XYZ[1] / s; 1156 } 1157 if (u <= 0.) ue = 0; 1158 else ue = itrunc(UVSCALE*u, em); 1159 if (ue > 255) ue = 255; 1160 if (v <= 0.) ve = 0; 1161 else ve = itrunc(UVSCALE*v, em); 1162 if (ve > 255) ve = 255; 1163 /* combine encodings */ 1164 return (Le << 16 | ue << 8 | ve); 1165 } 1166 1167 static void 1168 Luv32toXYZ(LogLuvState* sp, uint8* op, tmsize_t n) 1169 { 1170 uint32* luv = (uint32*) sp->tbuf; 1171 float* xyz = (float*) op; 1172 1173 while (n-- > 0) { 1174 LogLuv32toXYZ(*luv++, xyz); 1175 xyz += 3; 1176 } 1177 } 1178 1179 static void 1180 Luv32toLuv48(LogLuvState* sp, uint8* op, tmsize_t n) 1181 { 1182 uint32* luv = (uint32*) sp->tbuf; 1183 int16* luv3 = (int16*) op; 1184 1185 while (n-- > 0) { 1186 double u, v; 1187 1188 *luv3++ = (int16)(*luv >> 16); 1189 u = 1./UVSCALE * ((*luv>>8 & 0xff) + .5); 1190 v = 1./UVSCALE * ((*luv & 0xff) + .5); 1191 *luv3++ = (int16)(u * (1L<<15)); 1192 *luv3++ = (int16)(v * (1L<<15)); 1193 luv++; 1194 } 1195 } 1196 1197 static void 1198 Luv32toRGB(LogLuvState* sp, uint8* op, tmsize_t n) 1199 { 1200 uint32* luv = (uint32*) sp->tbuf; 1201 uint8* rgb = (uint8*) op; 1202 1203 while (n-- > 0) { 1204 float xyz[3]; 1205 1206 LogLuv32toXYZ(*luv++, xyz); 1207 XYZtoRGB24(xyz, rgb); 1208 rgb += 3; 1209 } 1210 } 1211 1212 static void 1213 Luv32fromXYZ(LogLuvState* sp, uint8* op, tmsize_t n) 1214 { 1215 uint32* luv = (uint32*) sp->tbuf; 1216 float* xyz = (float*) op; 1217 1218 while (n-- > 0) { 1219 *luv++ = LogLuv32fromXYZ(xyz, sp->encode_meth); 1220 xyz += 3; 1221 } 1222 } 1223 1224 static void 1225 Luv32fromLuv48(LogLuvState* sp, uint8* op, tmsize_t n) 1226 { 1227 uint32* luv = (uint32*) sp->tbuf; 1228 int16* luv3 = (int16*) op; 1229 1230 if (sp->encode_meth == SGILOGENCODE_NODITHER) { 1231 while (n-- > 0) { 1232 *luv++ = (uint32)luv3[0] << 16 | 1233 (luv3[1]*(uint32)(UVSCALE+.5) >> 7 & 0xff00) | 1234 (luv3[2]*(uint32)(UVSCALE+.5) >> 15 & 0xff); 1235 luv3 += 3; 1236 } 1237 return; 1238 } 1239 while (n-- > 0) { 1240 *luv++ = (uint32)luv3[0] << 16 | 1241 (itrunc(luv3[1]*(UVSCALE/(1<<15)), sp->encode_meth) << 8 & 0xff00) | 1242 (itrunc(luv3[2]*(UVSCALE/(1<<15)), sp->encode_meth) & 0xff); 1243 luv3 += 3; 1244 } 1245 } 1246 1247 static void 1248 _logLuvNop(LogLuvState* sp, uint8* op, tmsize_t n) 1249 { 1250 (void) sp; (void) op; (void) n; 1251 } 1252 1253 static int 1254 LogL16GuessDataFmt(TIFFDirectory *td) 1255 { 1256 #define PACK(s,b,f) (((b)<<6)|((s)<<3)|(f)) 1257 switch (PACK(td->td_samplesperpixel, td->td_bitspersample, td->td_sampleformat)) { 1258 case PACK(1, 32, SAMPLEFORMAT_IEEEFP): 1259 return (SGILOGDATAFMT_FLOAT); 1260 case PACK(1, 16, SAMPLEFORMAT_VOID): 1261 case PACK(1, 16, SAMPLEFORMAT_INT): 1262 case PACK(1, 16, SAMPLEFORMAT_UINT): 1263 return (SGILOGDATAFMT_16BIT); 1264 case PACK(1, 8, SAMPLEFORMAT_VOID): 1265 case PACK(1, 8, SAMPLEFORMAT_UINT): 1266 return (SGILOGDATAFMT_8BIT); 1267 } 1268 #undef PACK 1269 return (SGILOGDATAFMT_UNKNOWN); 1270 } 1271 1272 static tmsize_t 1273 multiply_ms(tmsize_t m1, tmsize_t m2) 1274 { 1275 return _TIFFMultiplySSize(NULL, m1, m2, NULL); 1276 } 1277 1278 static int 1279 LogL16InitState(TIFF* tif) 1280 { 1281 static const char module[] = "LogL16InitState"; 1282 TIFFDirectory *td = &tif->tif_dir; 1283 LogLuvState* sp = DecoderState(tif); 1284 1285 assert(sp != NULL); 1286 assert(td->td_photometric == PHOTOMETRIC_LOGL); 1287 1288 if( td->td_samplesperpixel != 1 ) 1289 { 1290 TIFFErrorExt(tif->tif_clientdata, module, 1291 "Sorry, can not handle LogL image with %s=%d", 1292 "Samples/pixel", td->td_samplesperpixel); 1293 return 0; 1294 } 1295 1296 /* for some reason, we can't do this in TIFFInitLogL16 */ 1297 if (sp->user_datafmt == SGILOGDATAFMT_UNKNOWN) 1298 sp->user_datafmt = LogL16GuessDataFmt(td); 1299 switch (sp->user_datafmt) { 1300 case SGILOGDATAFMT_FLOAT: 1301 sp->pixel_size = sizeof (float); 1302 break; 1303 case SGILOGDATAFMT_16BIT: 1304 sp->pixel_size = sizeof (int16); 1305 break; 1306 case SGILOGDATAFMT_8BIT: 1307 sp->pixel_size = sizeof (uint8); 1308 break; 1309 default: 1310 TIFFErrorExt(tif->tif_clientdata, module, 1311 "No support for converting user data format to LogL"); 1312 return (0); 1313 } 1314 if( isTiled(tif) ) 1315 sp->tbuflen = multiply_ms(td->td_tilewidth, td->td_tilelength); 1316 else if( td->td_rowsperstrip < td->td_imagelength ) 1317 sp->tbuflen = multiply_ms(td->td_imagewidth, td->td_rowsperstrip); 1318 else 1319 sp->tbuflen = multiply_ms(td->td_imagewidth, td->td_imagelength); 1320 if (multiply_ms(sp->tbuflen, sizeof (int16)) == 0 || 1321 (sp->tbuf = (uint8*) _TIFFmalloc(sp->tbuflen * sizeof (int16))) == NULL) { 1322 TIFFErrorExt(tif->tif_clientdata, module, "No space for SGILog translation buffer"); 1323 return (0); 1324 } 1325 return (1); 1326 } 1327 1328 static int 1329 LogLuvGuessDataFmt(TIFFDirectory *td) 1330 { 1331 int guess; 1332 1333 /* 1334 * If the user didn't tell us their datafmt, 1335 * take our best guess from the bitspersample. 1336 */ 1337 #define PACK(a,b) (((a)<<3)|(b)) 1338 switch (PACK(td->td_bitspersample, td->td_sampleformat)) { 1339 case PACK(32, SAMPLEFORMAT_IEEEFP): 1340 guess = SGILOGDATAFMT_FLOAT; 1341 break; 1342 case PACK(32, SAMPLEFORMAT_VOID): 1343 case PACK(32, SAMPLEFORMAT_UINT): 1344 case PACK(32, SAMPLEFORMAT_INT): 1345 guess = SGILOGDATAFMT_RAW; 1346 break; 1347 case PACK(16, SAMPLEFORMAT_VOID): 1348 case PACK(16, SAMPLEFORMAT_INT): 1349 case PACK(16, SAMPLEFORMAT_UINT): 1350 guess = SGILOGDATAFMT_16BIT; 1351 break; 1352 case PACK( 8, SAMPLEFORMAT_VOID): 1353 case PACK( 8, SAMPLEFORMAT_UINT): 1354 guess = SGILOGDATAFMT_8BIT; 1355 break; 1356 default: 1357 guess = SGILOGDATAFMT_UNKNOWN; 1358 break; 1359 #undef PACK 1360 } 1361 /* 1362 * Double-check samples per pixel. 1363 */ 1364 switch (td->td_samplesperpixel) { 1365 case 1: 1366 if (guess != SGILOGDATAFMT_RAW) 1367 guess = SGILOGDATAFMT_UNKNOWN; 1368 break; 1369 case 3: 1370 if (guess == SGILOGDATAFMT_RAW) 1371 guess = SGILOGDATAFMT_UNKNOWN; 1372 break; 1373 default: 1374 guess = SGILOGDATAFMT_UNKNOWN; 1375 break; 1376 } 1377 return (guess); 1378 } 1379 1380 static int 1381 LogLuvInitState(TIFF* tif) 1382 { 1383 static const char module[] = "LogLuvInitState"; 1384 TIFFDirectory* td = &tif->tif_dir; 1385 LogLuvState* sp = DecoderState(tif); 1386 1387 assert(sp != NULL); 1388 assert(td->td_photometric == PHOTOMETRIC_LOGLUV); 1389 1390 /* for some reason, we can't do this in TIFFInitLogLuv */ 1391 if (td->td_planarconfig != PLANARCONFIG_CONTIG) { 1392 TIFFErrorExt(tif->tif_clientdata, module, 1393 "SGILog compression cannot handle non-contiguous data"); 1394 return (0); 1395 } 1396 if (sp->user_datafmt == SGILOGDATAFMT_UNKNOWN) 1397 sp->user_datafmt = LogLuvGuessDataFmt(td); 1398 switch (sp->user_datafmt) { 1399 case SGILOGDATAFMT_FLOAT: 1400 sp->pixel_size = 3*sizeof (float); 1401 break; 1402 case SGILOGDATAFMT_16BIT: 1403 sp->pixel_size = 3*sizeof (int16); 1404 break; 1405 case SGILOGDATAFMT_RAW: 1406 sp->pixel_size = sizeof (uint32); 1407 break; 1408 case SGILOGDATAFMT_8BIT: 1409 sp->pixel_size = 3*sizeof (uint8); 1410 break; 1411 default: 1412 TIFFErrorExt(tif->tif_clientdata, module, 1413 "No support for converting user data format to LogLuv"); 1414 return (0); 1415 } 1416 if( isTiled(tif) ) 1417 sp->tbuflen = multiply_ms(td->td_tilewidth, td->td_tilelength); 1418 else if( td->td_rowsperstrip < td->td_imagelength ) 1419 sp->tbuflen = multiply_ms(td->td_imagewidth, td->td_rowsperstrip); 1420 else 1421 sp->tbuflen = multiply_ms(td->td_imagewidth, td->td_imagelength); 1422 if (multiply_ms(sp->tbuflen, sizeof (uint32)) == 0 || 1423 (sp->tbuf = (uint8*) _TIFFmalloc(sp->tbuflen * sizeof (uint32))) == NULL) { 1424 TIFFErrorExt(tif->tif_clientdata, module, "No space for SGILog translation buffer"); 1425 return (0); 1426 } 1427 return (1); 1428 } 1429 1430 static int 1431 LogLuvFixupTags(TIFF* tif) 1432 { 1433 (void) tif; 1434 return (1); 1435 } 1436 1437 static int 1438 LogLuvSetupDecode(TIFF* tif) 1439 { 1440 static const char module[] = "LogLuvSetupDecode"; 1441 LogLuvState* sp = DecoderState(tif); 1442 TIFFDirectory* td = &tif->tif_dir; 1443 1444 tif->tif_postdecode = _TIFFNoPostDecode; 1445 switch (td->td_photometric) { 1446 case PHOTOMETRIC_LOGLUV: 1447 if (!LogLuvInitState(tif)) 1448 break; 1449 if (td->td_compression == COMPRESSION_SGILOG24) { 1450 tif->tif_decoderow = LogLuvDecode24; 1451 switch (sp->user_datafmt) { 1452 case SGILOGDATAFMT_FLOAT: 1453 sp->tfunc = Luv24toXYZ; 1454 break; 1455 case SGILOGDATAFMT_16BIT: 1456 sp->tfunc = Luv24toLuv48; 1457 break; 1458 case SGILOGDATAFMT_8BIT: 1459 sp->tfunc = Luv24toRGB; 1460 break; 1461 } 1462 } else { 1463 tif->tif_decoderow = LogLuvDecode32; 1464 switch (sp->user_datafmt) { 1465 case SGILOGDATAFMT_FLOAT: 1466 sp->tfunc = Luv32toXYZ; 1467 break; 1468 case SGILOGDATAFMT_16BIT: 1469 sp->tfunc = Luv32toLuv48; 1470 break; 1471 case SGILOGDATAFMT_8BIT: 1472 sp->tfunc = Luv32toRGB; 1473 break; 1474 } 1475 } 1476 return (1); 1477 case PHOTOMETRIC_LOGL: 1478 if (!LogL16InitState(tif)) 1479 break; 1480 tif->tif_decoderow = LogL16Decode; 1481 switch (sp->user_datafmt) { 1482 case SGILOGDATAFMT_FLOAT: 1483 sp->tfunc = L16toY; 1484 break; 1485 case SGILOGDATAFMT_8BIT: 1486 sp->tfunc = L16toGry; 1487 break; 1488 } 1489 return (1); 1490 default: 1491 TIFFErrorExt(tif->tif_clientdata, module, 1492 "Inappropriate photometric interpretation %d for SGILog compression; %s", 1493 td->td_photometric, "must be either LogLUV or LogL"); 1494 break; 1495 } 1496 return (0); 1497 } 1498 1499 static int 1500 LogLuvSetupEncode(TIFF* tif) 1501 { 1502 static const char module[] = "LogLuvSetupEncode"; 1503 LogLuvState* sp = EncoderState(tif); 1504 TIFFDirectory* td = &tif->tif_dir; 1505 1506 switch (td->td_photometric) { 1507 case PHOTOMETRIC_LOGLUV: 1508 if (!LogLuvInitState(tif)) 1509 return (0); 1510 if (td->td_compression == COMPRESSION_SGILOG24) { 1511 tif->tif_encoderow = LogLuvEncode24; 1512 switch (sp->user_datafmt) { 1513 case SGILOGDATAFMT_FLOAT: 1514 sp->tfunc = Luv24fromXYZ; 1515 break; 1516 case SGILOGDATAFMT_16BIT: 1517 sp->tfunc = Luv24fromLuv48; 1518 break; 1519 case SGILOGDATAFMT_RAW: 1520 break; 1521 default: 1522 goto notsupported; 1523 } 1524 } else { 1525 tif->tif_encoderow = LogLuvEncode32; 1526 switch (sp->user_datafmt) { 1527 case SGILOGDATAFMT_FLOAT: 1528 sp->tfunc = Luv32fromXYZ; 1529 break; 1530 case SGILOGDATAFMT_16BIT: 1531 sp->tfunc = Luv32fromLuv48; 1532 break; 1533 case SGILOGDATAFMT_RAW: 1534 break; 1535 default: 1536 goto notsupported; 1537 } 1538 } 1539 break; 1540 case PHOTOMETRIC_LOGL: 1541 if (!LogL16InitState(tif)) 1542 return (0); 1543 tif->tif_encoderow = LogL16Encode; 1544 switch (sp->user_datafmt) { 1545 case SGILOGDATAFMT_FLOAT: 1546 sp->tfunc = L16fromY; 1547 break; 1548 case SGILOGDATAFMT_16BIT: 1549 break; 1550 default: 1551 goto notsupported; 1552 } 1553 break; 1554 default: 1555 TIFFErrorExt(tif->tif_clientdata, module, 1556 "Inappropriate photometric interpretation %d for SGILog compression; %s", 1557 td->td_photometric, "must be either LogLUV or LogL"); 1558 return (0); 1559 } 1560 sp->encoder_state = 1; 1561 return (1); 1562 notsupported: 1563 TIFFErrorExt(tif->tif_clientdata, module, 1564 "SGILog compression supported only for %s, or raw data", 1565 td->td_photometric == PHOTOMETRIC_LOGL ? "Y, L" : "XYZ, Luv"); 1566 return (0); 1567 } 1568 1569 static void 1570 LogLuvClose(TIFF* tif) 1571 { 1572 LogLuvState* sp = (LogLuvState*) tif->tif_data; 1573 TIFFDirectory *td = &tif->tif_dir; 1574 1575 assert(sp != 0); 1576 /* 1577 * For consistency, we always want to write out the same 1578 * bitspersample and sampleformat for our TIFF file, 1579 * regardless of the data format being used by the application. 1580 * Since this routine is called after tags have been set but 1581 * before they have been recorded in the file, we reset them here. 1582 * Note: this is really a nasty approach. See PixarLogClose 1583 */ 1584 if( sp->encoder_state ) 1585 { 1586 /* See PixarLogClose. Might avoid issues with tags whose size depends 1587 * on those below, but not completely sure this is enough. */ 1588 td->td_samplesperpixel = 1589 (td->td_photometric == PHOTOMETRIC_LOGL) ? 1 : 3; 1590 td->td_bitspersample = 16; 1591 td->td_sampleformat = SAMPLEFORMAT_INT; 1592 } 1593 } 1594 1595 static void 1596 LogLuvCleanup(TIFF* tif) 1597 { 1598 LogLuvState* sp = (LogLuvState *)tif->tif_data; 1599 1600 assert(sp != 0); 1601 1602 tif->tif_tagmethods.vgetfield = sp->vgetparent; 1603 tif->tif_tagmethods.vsetfield = sp->vsetparent; 1604 1605 if (sp->tbuf) 1606 _TIFFfree(sp->tbuf); 1607 _TIFFfree(sp); 1608 tif->tif_data = NULL; 1609 1610 _TIFFSetDefaultCompressionState(tif); 1611 } 1612 1613 static int 1614 LogLuvVSetField(TIFF* tif, uint32 tag, va_list ap) 1615 { 1616 static const char module[] = "LogLuvVSetField"; 1617 LogLuvState* sp = DecoderState(tif); 1618 int bps, fmt; 1619 1620 switch (tag) { 1621 case TIFFTAG_SGILOGDATAFMT: 1622 sp->user_datafmt = (int) va_arg(ap, int); 1623 /* 1624 * Tweak the TIFF header so that the rest of libtiff knows what 1625 * size of data will be passed between app and library, and 1626 * assume that the app knows what it is doing and is not 1627 * confused by these header manipulations... 1628 */ 1629 switch (sp->user_datafmt) { 1630 case SGILOGDATAFMT_FLOAT: 1631 bps = 32; 1632 fmt = SAMPLEFORMAT_IEEEFP; 1633 break; 1634 case SGILOGDATAFMT_16BIT: 1635 bps = 16; 1636 fmt = SAMPLEFORMAT_INT; 1637 break; 1638 case SGILOGDATAFMT_RAW: 1639 bps = 32; 1640 fmt = SAMPLEFORMAT_UINT; 1641 TIFFSetField(tif, TIFFTAG_SAMPLESPERPIXEL, 1); 1642 break; 1643 case SGILOGDATAFMT_8BIT: 1644 bps = 8; 1645 fmt = SAMPLEFORMAT_UINT; 1646 break; 1647 default: 1648 TIFFErrorExt(tif->tif_clientdata, tif->tif_name, 1649 "Unknown data format %d for LogLuv compression", 1650 sp->user_datafmt); 1651 return (0); 1652 } 1653 TIFFSetField(tif, TIFFTAG_BITSPERSAMPLE, bps); 1654 TIFFSetField(tif, TIFFTAG_SAMPLEFORMAT, fmt); 1655 /* 1656 * Must recalculate sizes should bits/sample change. 1657 */ 1658 tif->tif_tilesize = isTiled(tif) ? TIFFTileSize(tif) : (tmsize_t) -1; 1659 tif->tif_scanlinesize = TIFFScanlineSize(tif); 1660 return (1); 1661 case TIFFTAG_SGILOGENCODE: 1662 sp->encode_meth = (int) va_arg(ap, int); 1663 if (sp->encode_meth != SGILOGENCODE_NODITHER && 1664 sp->encode_meth != SGILOGENCODE_RANDITHER) { 1665 TIFFErrorExt(tif->tif_clientdata, module, 1666 "Unknown encoding %d for LogLuv compression", 1667 sp->encode_meth); 1668 return (0); 1669 } 1670 return (1); 1671 default: 1672 return (*sp->vsetparent)(tif, tag, ap); 1673 } 1674 } 1675 1676 static int 1677 LogLuvVGetField(TIFF* tif, uint32 tag, va_list ap) 1678 { 1679 LogLuvState *sp = (LogLuvState *)tif->tif_data; 1680 1681 switch (tag) { 1682 case TIFFTAG_SGILOGDATAFMT: 1683 *va_arg(ap, int*) = sp->user_datafmt; 1684 return (1); 1685 default: 1686 return (*sp->vgetparent)(tif, tag, ap); 1687 } 1688 } 1689 1690 static const TIFFField LogLuvFields[] = { 1691 { TIFFTAG_SGILOGDATAFMT, 0, 0, TIFF_SHORT, 0, TIFF_SETGET_INT, TIFF_SETGET_UNDEFINED, FIELD_PSEUDO, TRUE, FALSE, "SGILogDataFmt", NULL}, 1692 { TIFFTAG_SGILOGENCODE, 0, 0, TIFF_SHORT, 0, TIFF_SETGET_INT, TIFF_SETGET_UNDEFINED, FIELD_PSEUDO, TRUE, FALSE, "SGILogEncode", NULL} 1693 }; 1694 1695 int 1696 TIFFInitSGILog(TIFF* tif, int scheme) 1697 { 1698 static const char module[] = "TIFFInitSGILog"; 1699 LogLuvState* sp; 1700 1701 assert(scheme == COMPRESSION_SGILOG24 || scheme == COMPRESSION_SGILOG); 1702 1703 /* 1704 * Merge codec-specific tag information. 1705 */ 1706 if (!_TIFFMergeFields(tif, LogLuvFields, 1707 TIFFArrayCount(LogLuvFields))) { 1708 TIFFErrorExt(tif->tif_clientdata, module, 1709 "Merging SGILog codec-specific tags failed"); 1710 return 0; 1711 } 1712 1713 /* 1714 * Allocate state block so tag methods have storage to record values. 1715 */ 1716 tif->tif_data = (uint8*) _TIFFmalloc(sizeof (LogLuvState)); 1717 if (tif->tif_data == NULL) 1718 goto bad; 1719 sp = (LogLuvState*) tif->tif_data; 1720 _TIFFmemset((void*)sp, 0, sizeof (*sp)); 1721 sp->user_datafmt = SGILOGDATAFMT_UNKNOWN; 1722 sp->encode_meth = (scheme == COMPRESSION_SGILOG24) ? 1723 SGILOGENCODE_RANDITHER : SGILOGENCODE_NODITHER; 1724 sp->tfunc = _logLuvNop; 1725 1726 /* 1727 * Install codec methods. 1728 * NB: tif_decoderow & tif_encoderow are filled 1729 * in at setup time. 1730 */ 1731 tif->tif_fixuptags = LogLuvFixupTags; 1732 tif->tif_setupdecode = LogLuvSetupDecode; 1733 tif->tif_decodestrip = LogLuvDecodeStrip; 1734 tif->tif_decodetile = LogLuvDecodeTile; 1735 tif->tif_setupencode = LogLuvSetupEncode; 1736 tif->tif_encodestrip = LogLuvEncodeStrip; 1737 tif->tif_encodetile = LogLuvEncodeTile; 1738 tif->tif_close = LogLuvClose; 1739 tif->tif_cleanup = LogLuvCleanup; 1740 1741 /* 1742 * Override parent get/set field methods. 1743 */ 1744 sp->vgetparent = tif->tif_tagmethods.vgetfield; 1745 tif->tif_tagmethods.vgetfield = LogLuvVGetField; /* hook for codec tags */ 1746 sp->vsetparent = tif->tif_tagmethods.vsetfield; 1747 tif->tif_tagmethods.vsetfield = LogLuvVSetField; /* hook for codec tags */ 1748 1749 return (1); 1750 bad: 1751 TIFFErrorExt(tif->tif_clientdata, module, 1752 "%s: No space for LogLuv state block", tif->tif_name); 1753 return (0); 1754 } 1755 #endif /* LOGLUV_SUPPORT */ 1756 1757 /* vim: set ts=8 sts=8 sw=8 noet: */ 1758 /* 1759 * Local Variables: 1760 * mode: c 1761 * c-basic-offset: 8 1762 * fill-column: 78 1763 * End: 1764 */ 1765