1 /* $Id: tif_luv.c,v 1.40 2015-06-21 01:09:09 bfriesen 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 user_datafmt; /* user data format */ 162 int encode_meth; /* encoding method */ 163 int pixel_size; /* bytes per pixel */ 164 165 uint8* tbuf; /* translation buffer */ 166 tmsize_t tbuflen; /* buffer length */ 167 void (*tfunc)(LogLuvState*, uint8*, tmsize_t); 168 169 TIFFVSetMethod vgetparent; /* super-class method */ 170 TIFFVSetMethod vsetparent; /* super-class method */ 171 }; 172 173 #define DecoderState(tif) ((LogLuvState*) (tif)->tif_data) 174 #define EncoderState(tif) ((LogLuvState*) (tif)->tif_data) 175 176 #define SGILOGDATAFMT_UNKNOWN -1 177 178 #define MINRUN 4 /* minimum run length */ 179 180 /* 181 * Decode a string of 16-bit gray pixels. 182 */ 183 static int 184 LogL16Decode(TIFF* tif, uint8* op, tmsize_t occ, uint16 s) 185 { 186 static const char module[] = "LogL16Decode"; 187 LogLuvState* sp = DecoderState(tif); 188 int shft; 189 tmsize_t i; 190 tmsize_t npixels; 191 unsigned char* bp; 192 int16* tp; 193 int16 b; 194 tmsize_t cc; 195 int rc; 196 197 assert(s == 0); 198 assert(sp != NULL); 199 200 npixels = occ / sp->pixel_size; 201 202 if (sp->user_datafmt == SGILOGDATAFMT_16BIT) 203 tp = (int16*) op; 204 else { 205 if(sp->tbuflen < npixels) { 206 TIFFErrorExt(tif->tif_clientdata, module, 207 "Translation buffer too short"); 208 return (0); 209 } 210 tp = (int16*) sp->tbuf; 211 } 212 _TIFFmemset((void*) tp, 0, npixels*sizeof (tp[0])); 213 214 bp = (unsigned char*) tif->tif_rawcp; 215 cc = tif->tif_rawcc; 216 /* get each byte string */ 217 for (shft = 2*8; (shft -= 8) >= 0; ) { 218 for (i = 0; i < npixels && cc > 0; ) { 219 if (*bp >= 128) { /* run */ 220 if( cc < 2 ) 221 break; 222 rc = *bp++ + (2-128); 223 b = (int16)(*bp++ << shft); 224 cc -= 2; 225 while (rc-- && i < npixels) 226 tp[i++] |= b; 227 } else { /* non-run */ 228 rc = *bp++; /* nul is noop */ 229 while (--cc && rc-- && i < npixels) 230 tp[i++] |= (int16)*bp++ << shft; 231 } 232 } 233 if (i != npixels) { 234 #if defined(__WIN32__) && (defined(_MSC_VER) || defined(__MINGW32__)) 235 TIFFErrorExt(tif->tif_clientdata, module, 236 "Not enough data at row %lu (short %I64d pixels)", 237 (unsigned long) tif->tif_row, 238 (unsigned __int64) (npixels - i)); 239 #else 240 TIFFErrorExt(tif->tif_clientdata, module, 241 "Not enough data at row %lu (short %llu pixels)", 242 (unsigned long) tif->tif_row, 243 (unsigned long long) (npixels - i)); 244 #endif 245 tif->tif_rawcp = (uint8*) bp; 246 tif->tif_rawcc = cc; 247 return (0); 248 } 249 } 250 (*sp->tfunc)(sp, op, npixels); 251 tif->tif_rawcp = (uint8*) bp; 252 tif->tif_rawcc = cc; 253 return (1); 254 } 255 256 /* 257 * Decode a string of 24-bit pixels. 258 */ 259 static int 260 LogLuvDecode24(TIFF* tif, uint8* op, tmsize_t occ, uint16 s) 261 { 262 static const char module[] = "LogLuvDecode24"; 263 LogLuvState* sp = DecoderState(tif); 264 tmsize_t cc; 265 tmsize_t i; 266 tmsize_t npixels; 267 unsigned char* bp; 268 uint32* tp; 269 270 assert(s == 0); 271 assert(sp != NULL); 272 273 npixels = occ / sp->pixel_size; 274 275 if (sp->user_datafmt == SGILOGDATAFMT_RAW) 276 tp = (uint32 *)op; 277 else { 278 if(sp->tbuflen < npixels) { 279 TIFFErrorExt(tif->tif_clientdata, module, 280 "Translation buffer too short"); 281 return (0); 282 } 283 tp = (uint32 *) sp->tbuf; 284 } 285 /* copy to array of uint32 */ 286 bp = (unsigned char*) tif->tif_rawcp; 287 cc = tif->tif_rawcc; 288 for (i = 0; i < npixels && cc >= 3; i++) { 289 tp[i] = bp[0] << 16 | bp[1] << 8 | bp[2]; 290 bp += 3; 291 cc -= 3; 292 } 293 tif->tif_rawcp = (uint8*) bp; 294 tif->tif_rawcc = cc; 295 if (i != npixels) { 296 #if defined(__WIN32__) && (defined(_MSC_VER) || defined(__MINGW32__)) 297 TIFFErrorExt(tif->tif_clientdata, module, 298 "Not enough data at row %lu (short %I64d pixels)", 299 (unsigned long) tif->tif_row, 300 (unsigned __int64) (npixels - i)); 301 #else 302 TIFFErrorExt(tif->tif_clientdata, module, 303 "Not enough data at row %lu (short %llu pixels)", 304 (unsigned long) tif->tif_row, 305 (unsigned long long) (npixels - i)); 306 #endif 307 return (0); 308 } 309 (*sp->tfunc)(sp, op, npixels); 310 return (1); 311 } 312 313 /* 314 * Decode a string of 32-bit pixels. 315 */ 316 static int 317 LogLuvDecode32(TIFF* tif, uint8* op, tmsize_t occ, uint16 s) 318 { 319 static const char module[] = "LogLuvDecode32"; 320 LogLuvState* sp; 321 int shft; 322 tmsize_t i; 323 tmsize_t npixels; 324 unsigned char* bp; 325 uint32* tp; 326 uint32 b; 327 tmsize_t cc; 328 int rc; 329 330 assert(s == 0); 331 sp = DecoderState(tif); 332 assert(sp != NULL); 333 334 npixels = occ / sp->pixel_size; 335 336 if (sp->user_datafmt == SGILOGDATAFMT_RAW) 337 tp = (uint32*) op; 338 else { 339 if(sp->tbuflen < npixels) { 340 TIFFErrorExt(tif->tif_clientdata, module, 341 "Translation buffer too short"); 342 return (0); 343 } 344 tp = (uint32*) sp->tbuf; 345 } 346 _TIFFmemset((void*) tp, 0, npixels*sizeof (tp[0])); 347 348 bp = (unsigned char*) tif->tif_rawcp; 349 cc = tif->tif_rawcc; 350 /* get each byte string */ 351 for (shft = 4*8; (shft -= 8) >= 0; ) { 352 for (i = 0; i < npixels && cc > 0; ) { 353 if (*bp >= 128) { /* run */ 354 if( cc < 2 ) 355 break; 356 rc = *bp++ + (2-128); 357 b = (uint32)*bp++ << shft; 358 cc -= 2; 359 while (rc-- && i < npixels) 360 tp[i++] |= b; 361 } else { /* non-run */ 362 rc = *bp++; /* nul is noop */ 363 while (--cc && rc-- && i < npixels) 364 tp[i++] |= (uint32)*bp++ << shft; 365 } 366 } 367 if (i != npixels) { 368 #if defined(__WIN32__) && (defined(_MSC_VER) || defined(__MINGW32__)) 369 TIFFErrorExt(tif->tif_clientdata, module, 370 "Not enough data at row %lu (short %I64d pixels)", 371 (unsigned long) tif->tif_row, 372 (unsigned __int64) (npixels - i)); 373 #else 374 TIFFErrorExt(tif->tif_clientdata, module, 375 "Not enough data at row %lu (short %llu pixels)", 376 (unsigned long) tif->tif_row, 377 (unsigned long long) (npixels - i)); 378 #endif 379 tif->tif_rawcp = (uint8*) bp; 380 tif->tif_rawcc = cc; 381 return (0); 382 } 383 } 384 (*sp->tfunc)(sp, op, npixels); 385 tif->tif_rawcp = (uint8*) bp; 386 tif->tif_rawcc = cc; 387 return (1); 388 } 389 390 /* 391 * Decode a strip of pixels. We break it into rows to 392 * maintain synchrony with the encode algorithm, which 393 * is row by row. 394 */ 395 static int 396 LogLuvDecodeStrip(TIFF* tif, uint8* bp, tmsize_t cc, uint16 s) 397 { 398 tmsize_t rowlen = TIFFScanlineSize(tif); 399 400 if (rowlen == 0) 401 return 0; 402 403 assert(cc%rowlen == 0); 404 while (cc && (*tif->tif_decoderow)(tif, bp, rowlen, s)) 405 bp += rowlen, cc -= rowlen; 406 return (cc == 0); 407 } 408 409 /* 410 * Decode a tile of pixels. We break it into rows to 411 * maintain synchrony with the encode algorithm, which 412 * is row by row. 413 */ 414 static int 415 LogLuvDecodeTile(TIFF* tif, uint8* bp, tmsize_t cc, uint16 s) 416 { 417 tmsize_t rowlen = TIFFTileRowSize(tif); 418 419 if (rowlen == 0) 420 return 0; 421 422 assert(cc%rowlen == 0); 423 while (cc && (*tif->tif_decoderow)(tif, bp, rowlen, s)) 424 bp += rowlen, cc -= rowlen; 425 return (cc == 0); 426 } 427 428 /* 429 * Encode a row of 16-bit pixels. 430 */ 431 static int 432 LogL16Encode(TIFF* tif, uint8* bp, tmsize_t cc, uint16 s) 433 { 434 static const char module[] = "LogL16Encode"; 435 LogLuvState* sp = EncoderState(tif); 436 int shft; 437 tmsize_t i; 438 tmsize_t j; 439 tmsize_t npixels; 440 uint8* op; 441 int16* tp; 442 int16 b; 443 tmsize_t occ; 444 int rc=0, mask; 445 tmsize_t beg; 446 447 assert(s == 0); 448 assert(sp != NULL); 449 npixels = cc / sp->pixel_size; 450 451 if (sp->user_datafmt == SGILOGDATAFMT_16BIT) 452 tp = (int16*) bp; 453 else { 454 tp = (int16*) sp->tbuf; 455 if(sp->tbuflen < npixels) { 456 TIFFErrorExt(tif->tif_clientdata, module, 457 "Translation buffer too short"); 458 return (0); 459 } 460 (*sp->tfunc)(sp, bp, npixels); 461 } 462 /* compress each byte string */ 463 op = tif->tif_rawcp; 464 occ = tif->tif_rawdatasize - tif->tif_rawcc; 465 for (shft = 2*8; (shft -= 8) >= 0; ) 466 for (i = 0; i < npixels; i += rc) { 467 if (occ < 4) { 468 tif->tif_rawcp = op; 469 tif->tif_rawcc = tif->tif_rawdatasize - occ; 470 if (!TIFFFlushData1(tif)) 471 return (-1); 472 op = tif->tif_rawcp; 473 occ = tif->tif_rawdatasize - tif->tif_rawcc; 474 } 475 mask = 0xff << shft; /* find next run */ 476 for (beg = i; beg < npixels; beg += rc) { 477 b = (int16) (tp[beg] & mask); 478 rc = 1; 479 while (rc < 127+2 && beg+rc < npixels && 480 (tp[beg+rc] & mask) == b) 481 rc++; 482 if (rc >= MINRUN) 483 break; /* long enough */ 484 } 485 if (beg-i > 1 && beg-i < MINRUN) { 486 b = (int16) (tp[i] & mask);/*check short run */ 487 j = i+1; 488 while ((tp[j++] & mask) == b) 489 if (j == beg) { 490 *op++ = (uint8)(128-2+j-i); 491 *op++ = (uint8)(b >> shft); 492 occ -= 2; 493 i = beg; 494 break; 495 } 496 } 497 while (i < beg) { /* write out non-run */ 498 if ((j = beg-i) > 127) j = 127; 499 if (occ < j+3) { 500 tif->tif_rawcp = op; 501 tif->tif_rawcc = tif->tif_rawdatasize - occ; 502 if (!TIFFFlushData1(tif)) 503 return (-1); 504 op = tif->tif_rawcp; 505 occ = tif->tif_rawdatasize - tif->tif_rawcc; 506 } 507 *op++ = (uint8) j; occ--; 508 while (j--) { 509 *op++ = (uint8) (tp[i++] >> shft & 0xff); 510 occ--; 511 } 512 } 513 if (rc >= MINRUN) { /* write out run */ 514 *op++ = (uint8) (128-2+rc); 515 *op++ = (uint8) (tp[beg] >> shft & 0xff); 516 occ -= 2; 517 } else 518 rc = 0; 519 } 520 tif->tif_rawcp = op; 521 tif->tif_rawcc = tif->tif_rawdatasize - occ; 522 523 return (1); 524 } 525 526 /* 527 * Encode a row of 24-bit pixels. 528 */ 529 static int 530 LogLuvEncode24(TIFF* tif, uint8* bp, tmsize_t cc, uint16 s) 531 { 532 static const char module[] = "LogLuvEncode24"; 533 LogLuvState* sp = EncoderState(tif); 534 tmsize_t i; 535 tmsize_t npixels; 536 tmsize_t occ; 537 uint8* op; 538 uint32* tp; 539 540 assert(s == 0); 541 assert(sp != NULL); 542 npixels = cc / sp->pixel_size; 543 544 if (sp->user_datafmt == SGILOGDATAFMT_RAW) 545 tp = (uint32*) bp; 546 else { 547 tp = (uint32*) sp->tbuf; 548 if(sp->tbuflen < npixels) { 549 TIFFErrorExt(tif->tif_clientdata, module, 550 "Translation buffer too short"); 551 return (0); 552 } 553 (*sp->tfunc)(sp, bp, npixels); 554 } 555 /* write out encoded pixels */ 556 op = tif->tif_rawcp; 557 occ = tif->tif_rawdatasize - tif->tif_rawcc; 558 for (i = npixels; i--; ) { 559 if (occ < 3) { 560 tif->tif_rawcp = op; 561 tif->tif_rawcc = tif->tif_rawdatasize - occ; 562 if (!TIFFFlushData1(tif)) 563 return (-1); 564 op = tif->tif_rawcp; 565 occ = tif->tif_rawdatasize - tif->tif_rawcc; 566 } 567 *op++ = (uint8)(*tp >> 16); 568 *op++ = (uint8)(*tp >> 8 & 0xff); 569 *op++ = (uint8)(*tp++ & 0xff); 570 occ -= 3; 571 } 572 tif->tif_rawcp = op; 573 tif->tif_rawcc = tif->tif_rawdatasize - occ; 574 575 return (1); 576 } 577 578 /* 579 * Encode a row of 32-bit pixels. 580 */ 581 static int 582 LogLuvEncode32(TIFF* tif, uint8* bp, tmsize_t cc, uint16 s) 583 { 584 static const char module[] = "LogLuvEncode32"; 585 LogLuvState* sp = EncoderState(tif); 586 int shft; 587 tmsize_t i; 588 tmsize_t j; 589 tmsize_t npixels; 590 uint8* op; 591 uint32* tp; 592 uint32 b; 593 tmsize_t occ; 594 int rc=0, mask; 595 tmsize_t beg; 596 597 assert(s == 0); 598 assert(sp != NULL); 599 600 npixels = cc / sp->pixel_size; 601 602 if (sp->user_datafmt == SGILOGDATAFMT_RAW) 603 tp = (uint32*) bp; 604 else { 605 tp = (uint32*) sp->tbuf; 606 if(sp->tbuflen < npixels) { 607 TIFFErrorExt(tif->tif_clientdata, module, 608 "Translation buffer too short"); 609 return (0); 610 } 611 (*sp->tfunc)(sp, bp, npixels); 612 } 613 /* compress each byte string */ 614 op = tif->tif_rawcp; 615 occ = tif->tif_rawdatasize - tif->tif_rawcc; 616 for (shft = 4*8; (shft -= 8) >= 0; ) 617 for (i = 0; i < npixels; i += rc) { 618 if (occ < 4) { 619 tif->tif_rawcp = op; 620 tif->tif_rawcc = tif->tif_rawdatasize - occ; 621 if (!TIFFFlushData1(tif)) 622 return (-1); 623 op = tif->tif_rawcp; 624 occ = tif->tif_rawdatasize - tif->tif_rawcc; 625 } 626 mask = 0xff << shft; /* find next run */ 627 for (beg = i; beg < npixels; beg += rc) { 628 b = tp[beg] & mask; 629 rc = 1; 630 while (rc < 127+2 && beg+rc < npixels && 631 (tp[beg+rc] & mask) == b) 632 rc++; 633 if (rc >= MINRUN) 634 break; /* long enough */ 635 } 636 if (beg-i > 1 && beg-i < MINRUN) { 637 b = tp[i] & mask; /* check short run */ 638 j = i+1; 639 while ((tp[j++] & mask) == b) 640 if (j == beg) { 641 *op++ = (uint8)(128-2+j-i); 642 *op++ = (uint8)(b >> shft); 643 occ -= 2; 644 i = beg; 645 break; 646 } 647 } 648 while (i < beg) { /* write out non-run */ 649 if ((j = beg-i) > 127) j = 127; 650 if (occ < j+3) { 651 tif->tif_rawcp = op; 652 tif->tif_rawcc = tif->tif_rawdatasize - occ; 653 if (!TIFFFlushData1(tif)) 654 return (-1); 655 op = tif->tif_rawcp; 656 occ = tif->tif_rawdatasize - tif->tif_rawcc; 657 } 658 *op++ = (uint8) j; occ--; 659 while (j--) { 660 *op++ = (uint8)(tp[i++] >> shft & 0xff); 661 occ--; 662 } 663 } 664 if (rc >= MINRUN) { /* write out run */ 665 *op++ = (uint8) (128-2+rc); 666 *op++ = (uint8)(tp[beg] >> shft & 0xff); 667 occ -= 2; 668 } else 669 rc = 0; 670 } 671 tif->tif_rawcp = op; 672 tif->tif_rawcc = tif->tif_rawdatasize - occ; 673 674 return (1); 675 } 676 677 /* 678 * Encode a strip of pixels. We break it into rows to 679 * avoid encoding runs across row boundaries. 680 */ 681 static int 682 LogLuvEncodeStrip(TIFF* tif, uint8* bp, tmsize_t cc, uint16 s) 683 { 684 tmsize_t rowlen = TIFFScanlineSize(tif); 685 686 if (rowlen == 0) 687 return 0; 688 689 assert(cc%rowlen == 0); 690 while (cc && (*tif->tif_encoderow)(tif, bp, rowlen, s) == 1) 691 bp += rowlen, cc -= rowlen; 692 return (cc == 0); 693 } 694 695 /* 696 * Encode a tile of pixels. We break it into rows to 697 * avoid encoding runs across row boundaries. 698 */ 699 static int 700 LogLuvEncodeTile(TIFF* tif, uint8* bp, tmsize_t cc, uint16 s) 701 { 702 tmsize_t rowlen = TIFFTileRowSize(tif); 703 704 if (rowlen == 0) 705 return 0; 706 707 assert(cc%rowlen == 0); 708 while (cc && (*tif->tif_encoderow)(tif, bp, rowlen, s) == 1) 709 bp += rowlen, cc -= rowlen; 710 return (cc == 0); 711 } 712 713 /* 714 * Encode/Decode functions for converting to and from user formats. 715 */ 716 717 #include "uvcode.h" 718 719 #ifndef UVSCALE 720 #define U_NEU 0.210526316 721 #define V_NEU 0.473684211 722 #define UVSCALE 410. 723 #endif 724 725 #ifndef M_LN2 726 #define M_LN2 0.69314718055994530942 727 #endif 728 #ifndef M_PI 729 #define M_PI 3.14159265358979323846 730 #endif 731 #undef log2 /* Conflict with C'99 function */ 732 #define log2(x) ((1./M_LN2)*log(x)) 733 #undef exp2 /* Conflict with C'99 function */ 734 #define exp2(x) exp(M_LN2*(x)) 735 736 #define itrunc(x,m) ((m)==SGILOGENCODE_NODITHER ? \ 737 (int)(x) : \ 738 (int)((x) + rand()*(1./RAND_MAX) - .5)) 739 740 #if !LOGLUV_PUBLIC 741 static 742 #endif 743 double 744 LogL16toY(int p16) /* compute luminance from 16-bit LogL */ 745 { 746 int Le = p16 & 0x7fff; 747 double Y; 748 749 if (!Le) 750 return (0.); 751 Y = exp(M_LN2/256.*(Le+.5) - M_LN2*64.); 752 return (!(p16 & 0x8000) ? Y : -Y); 753 } 754 755 #if !LOGLUV_PUBLIC 756 static 757 #endif 758 int 759 LogL16fromY(double Y, int em) /* get 16-bit LogL from Y */ 760 { 761 if (Y >= 1.8371976e19) 762 return (0x7fff); 763 if (Y <= -1.8371976e19) 764 return (0xffff); 765 if (Y > 5.4136769e-20) 766 return itrunc(256.*(log2(Y) + 64.), em); 767 if (Y < -5.4136769e-20) 768 return (~0x7fff | itrunc(256.*(log2(-Y) + 64.), em)); 769 return (0); 770 } 771 772 static void 773 L16toY(LogLuvState* sp, uint8* op, tmsize_t n) 774 { 775 int16* l16 = (int16*) sp->tbuf; 776 float* yp = (float*) op; 777 778 while (n-- > 0) 779 *yp++ = (float)LogL16toY(*l16++); 780 } 781 782 static void 783 L16toGry(LogLuvState* sp, uint8* op, tmsize_t n) 784 { 785 int16* l16 = (int16*) sp->tbuf; 786 uint8* gp = (uint8*) op; 787 788 while (n-- > 0) { 789 double Y = LogL16toY(*l16++); 790 *gp++ = (uint8) ((Y <= 0.) ? 0 : (Y >= 1.) ? 255 : (int)(256.*sqrt(Y))); 791 } 792 } 793 794 static void 795 L16fromY(LogLuvState* sp, uint8* op, tmsize_t n) 796 { 797 int16* l16 = (int16*) sp->tbuf; 798 float* yp = (float*) op; 799 800 while (n-- > 0) 801 *l16++ = (int16) (LogL16fromY(*yp++, sp->encode_meth)); 802 } 803 804 #if !LOGLUV_PUBLIC 805 static 806 #endif 807 void 808 XYZtoRGB24(float xyz[3], uint8 rgb[3]) 809 { 810 double r, g, b; 811 /* assume CCIR-709 primaries */ 812 r = 2.690*xyz[0] + -1.276*xyz[1] + -0.414*xyz[2]; 813 g = -1.022*xyz[0] + 1.978*xyz[1] + 0.044*xyz[2]; 814 b = 0.061*xyz[0] + -0.224*xyz[1] + 1.163*xyz[2]; 815 /* assume 2.0 gamma for speed */ 816 /* could use integer sqrt approx., but this is probably faster */ 817 rgb[0] = (uint8)((r<=0.) ? 0 : (r >= 1.) ? 255 : (int)(256.*sqrt(r))); 818 rgb[1] = (uint8)((g<=0.) ? 0 : (g >= 1.) ? 255 : (int)(256.*sqrt(g))); 819 rgb[2] = (uint8)((b<=0.) ? 0 : (b >= 1.) ? 255 : (int)(256.*sqrt(b))); 820 } 821 822 #if !LOGLUV_PUBLIC 823 static 824 #endif 825 double 826 LogL10toY(int p10) /* compute luminance from 10-bit LogL */ 827 { 828 if (p10 == 0) 829 return (0.); 830 return (exp(M_LN2/64.*(p10+.5) - M_LN2*12.)); 831 } 832 833 #if !LOGLUV_PUBLIC 834 static 835 #endif 836 int 837 LogL10fromY(double Y, int em) /* get 10-bit LogL from Y */ 838 { 839 if (Y >= 15.742) 840 return (0x3ff); 841 else if (Y <= .00024283) 842 return (0); 843 else 844 return itrunc(64.*(log2(Y) + 12.), em); 845 } 846 847 #define NANGLES 100 848 #define uv2ang(u, v) ( (NANGLES*.499999999/M_PI) \ 849 * atan2((v)-V_NEU,(u)-U_NEU) + .5*NANGLES ) 850 851 static int 852 oog_encode(double u, double v) /* encode out-of-gamut chroma */ 853 { 854 static int oog_table[NANGLES]; 855 static int initialized = 0; 856 register int i; 857 858 if (!initialized) { /* set up perimeter table */ 859 double eps[NANGLES], ua, va, ang, epsa; 860 int ui, vi, ustep; 861 for (i = NANGLES; i--; ) 862 eps[i] = 2.; 863 for (vi = UV_NVS; vi--; ) { 864 va = UV_VSTART + (vi+.5)*UV_SQSIZ; 865 ustep = uv_row[vi].nus-1; 866 if (vi == UV_NVS-1 || vi == 0 || ustep <= 0) 867 ustep = 1; 868 for (ui = uv_row[vi].nus-1; ui >= 0; ui -= ustep) { 869 ua = uv_row[vi].ustart + (ui+.5)*UV_SQSIZ; 870 ang = uv2ang(ua, va); 871 i = (int) ang; 872 epsa = fabs(ang - (i+.5)); 873 if (epsa < eps[i]) { 874 oog_table[i] = uv_row[vi].ncum + ui; 875 eps[i] = epsa; 876 } 877 } 878 } 879 for (i = NANGLES; i--; ) /* fill any holes */ 880 if (eps[i] > 1.5) { 881 int i1, i2; 882 for (i1 = 1; i1 < NANGLES/2; i1++) 883 if (eps[(i+i1)%NANGLES] < 1.5) 884 break; 885 for (i2 = 1; i2 < NANGLES/2; i2++) 886 if (eps[(i+NANGLES-i2)%NANGLES] < 1.5) 887 break; 888 if (i1 < i2) 889 oog_table[i] = 890 oog_table[(i+i1)%NANGLES]; 891 else 892 oog_table[i] = 893 oog_table[(i+NANGLES-i2)%NANGLES]; 894 } 895 initialized = 1; 896 } 897 i = (int) uv2ang(u, v); /* look up hue angle */ 898 return (oog_table[i]); 899 } 900 901 #undef uv2ang 902 #undef NANGLES 903 904 #if !LOGLUV_PUBLIC 905 static 906 #endif 907 int 908 uv_encode(double u, double v, int em) /* encode (u',v') coordinates */ 909 { 910 register int vi, ui; 911 912 if (v < UV_VSTART) 913 return oog_encode(u, v); 914 vi = itrunc((v - UV_VSTART)*(1./UV_SQSIZ), em); 915 if (vi >= UV_NVS) 916 return oog_encode(u, v); 917 if (u < uv_row[vi].ustart) 918 return oog_encode(u, v); 919 ui = itrunc((u - uv_row[vi].ustart)*(1./UV_SQSIZ), em); 920 if (ui >= uv_row[vi].nus) 921 return oog_encode(u, v); 922 923 return (uv_row[vi].ncum + ui); 924 } 925 926 #if !LOGLUV_PUBLIC 927 static 928 #endif 929 int 930 uv_decode(double *up, double *vp, int c) /* decode (u',v') index */ 931 { 932 int upper, lower; 933 register int ui, vi; 934 935 if (c < 0 || c >= UV_NDIVS) 936 return (-1); 937 lower = 0; /* binary search */ 938 upper = UV_NVS; 939 while (upper - lower > 1) { 940 vi = (lower + upper) >> 1; 941 ui = c - uv_row[vi].ncum; 942 if (ui > 0) 943 lower = vi; 944 else if (ui < 0) 945 upper = vi; 946 else { 947 lower = vi; 948 break; 949 } 950 } 951 vi = lower; 952 ui = c - uv_row[vi].ncum; 953 *up = uv_row[vi].ustart + (ui+.5)*UV_SQSIZ; 954 *vp = UV_VSTART + (vi+.5)*UV_SQSIZ; 955 return (0); 956 } 957 958 #if !LOGLUV_PUBLIC 959 static 960 #endif 961 void 962 LogLuv24toXYZ(uint32 p, float XYZ[3]) 963 { 964 int Ce; 965 double L, u, v, s, x, y; 966 /* decode luminance */ 967 L = LogL10toY(p>>14 & 0x3ff); 968 if (L <= 0.) { 969 XYZ[0] = XYZ[1] = XYZ[2] = 0.; 970 return; 971 } 972 /* decode color */ 973 Ce = p & 0x3fff; 974 if (uv_decode(&u, &v, Ce) < 0) { 975 u = U_NEU; v = V_NEU; 976 } 977 s = 1./(6.*u - 16.*v + 12.); 978 x = 9.*u * s; 979 y = 4.*v * s; 980 /* convert to XYZ */ 981 XYZ[0] = (float)(x/y * L); 982 XYZ[1] = (float)L; 983 XYZ[2] = (float)((1.-x-y)/y * L); 984 } 985 986 #if !LOGLUV_PUBLIC 987 static 988 #endif 989 uint32 990 LogLuv24fromXYZ(float XYZ[3], int em) 991 { 992 int Le, Ce; 993 double u, v, s; 994 /* encode luminance */ 995 Le = LogL10fromY(XYZ[1], em); 996 /* encode color */ 997 s = XYZ[0] + 15.*XYZ[1] + 3.*XYZ[2]; 998 if (!Le || s <= 0.) { 999 u = U_NEU; 1000 v = V_NEU; 1001 } else { 1002 u = 4.*XYZ[0] / s; 1003 v = 9.*XYZ[1] / s; 1004 } 1005 Ce = uv_encode(u, v, em); 1006 if (Ce < 0) /* never happens */ 1007 Ce = uv_encode(U_NEU, V_NEU, SGILOGENCODE_NODITHER); 1008 /* combine encodings */ 1009 return (Le << 14 | Ce); 1010 } 1011 1012 static void 1013 Luv24toXYZ(LogLuvState* sp, uint8* op, tmsize_t n) 1014 { 1015 uint32* luv = (uint32*) sp->tbuf; 1016 float* xyz = (float*) op; 1017 1018 while (n-- > 0) { 1019 LogLuv24toXYZ(*luv, xyz); 1020 xyz += 3; 1021 luv++; 1022 } 1023 } 1024 1025 static void 1026 Luv24toLuv48(LogLuvState* sp, uint8* op, tmsize_t n) 1027 { 1028 uint32* luv = (uint32*) sp->tbuf; 1029 int16* luv3 = (int16*) op; 1030 1031 while (n-- > 0) { 1032 double u, v; 1033 1034 *luv3++ = (int16)((*luv >> 12 & 0xffd) + 13314); 1035 if (uv_decode(&u, &v, *luv&0x3fff) < 0) { 1036 u = U_NEU; 1037 v = V_NEU; 1038 } 1039 *luv3++ = (int16)(u * (1L<<15)); 1040 *luv3++ = (int16)(v * (1L<<15)); 1041 luv++; 1042 } 1043 } 1044 1045 static void 1046 Luv24toRGB(LogLuvState* sp, uint8* op, tmsize_t n) 1047 { 1048 uint32* luv = (uint32*) sp->tbuf; 1049 uint8* rgb = (uint8*) op; 1050 1051 while (n-- > 0) { 1052 float xyz[3]; 1053 1054 LogLuv24toXYZ(*luv++, xyz); 1055 XYZtoRGB24(xyz, rgb); 1056 rgb += 3; 1057 } 1058 } 1059 1060 static void 1061 Luv24fromXYZ(LogLuvState* sp, uint8* op, tmsize_t n) 1062 { 1063 uint32* luv = (uint32*) sp->tbuf; 1064 float* xyz = (float*) op; 1065 1066 while (n-- > 0) { 1067 *luv++ = LogLuv24fromXYZ(xyz, sp->encode_meth); 1068 xyz += 3; 1069 } 1070 } 1071 1072 static void 1073 Luv24fromLuv48(LogLuvState* sp, uint8* op, tmsize_t n) 1074 { 1075 uint32* luv = (uint32*) sp->tbuf; 1076 int16* luv3 = (int16*) op; 1077 1078 while (n-- > 0) { 1079 int Le, Ce; 1080 1081 if (luv3[0] <= 0) 1082 Le = 0; 1083 else if (luv3[0] >= (1<<12)+3314) 1084 Le = (1<<10) - 1; 1085 else if (sp->encode_meth == SGILOGENCODE_NODITHER) 1086 Le = (luv3[0]-3314) >> 2; 1087 else 1088 Le = itrunc(.25*(luv3[0]-3314.), sp->encode_meth); 1089 1090 Ce = uv_encode((luv3[1]+.5)/(1<<15), (luv3[2]+.5)/(1<<15), 1091 sp->encode_meth); 1092 if (Ce < 0) /* never happens */ 1093 Ce = uv_encode(U_NEU, V_NEU, SGILOGENCODE_NODITHER); 1094 *luv++ = (uint32)Le << 14 | Ce; 1095 luv3 += 3; 1096 } 1097 } 1098 1099 #if !LOGLUV_PUBLIC 1100 static 1101 #endif 1102 void 1103 LogLuv32toXYZ(uint32 p, float XYZ[3]) 1104 { 1105 double L, u, v, s, x, y; 1106 /* decode luminance */ 1107 L = LogL16toY((int)p >> 16); 1108 if (L <= 0.) { 1109 XYZ[0] = XYZ[1] = XYZ[2] = 0.; 1110 return; 1111 } 1112 /* decode color */ 1113 u = 1./UVSCALE * ((p>>8 & 0xff) + .5); 1114 v = 1./UVSCALE * ((p & 0xff) + .5); 1115 s = 1./(6.*u - 16.*v + 12.); 1116 x = 9.*u * s; 1117 y = 4.*v * s; 1118 /* convert to XYZ */ 1119 XYZ[0] = (float)(x/y * L); 1120 XYZ[1] = (float)L; 1121 XYZ[2] = (float)((1.-x-y)/y * L); 1122 } 1123 1124 #if !LOGLUV_PUBLIC 1125 static 1126 #endif 1127 uint32 1128 LogLuv32fromXYZ(float XYZ[3], int em) 1129 { 1130 unsigned int Le, ue, ve; 1131 double u, v, s; 1132 /* encode luminance */ 1133 Le = (unsigned int)LogL16fromY(XYZ[1], em); 1134 /* encode color */ 1135 s = XYZ[0] + 15.*XYZ[1] + 3.*XYZ[2]; 1136 if (!Le || s <= 0.) { 1137 u = U_NEU; 1138 v = V_NEU; 1139 } else { 1140 u = 4.*XYZ[0] / s; 1141 v = 9.*XYZ[1] / s; 1142 } 1143 if (u <= 0.) ue = 0; 1144 else ue = itrunc(UVSCALE*u, em); 1145 if (ue > 255) ue = 255; 1146 if (v <= 0.) ve = 0; 1147 else ve = itrunc(UVSCALE*v, em); 1148 if (ve > 255) ve = 255; 1149 /* combine encodings */ 1150 return (Le << 16 | ue << 8 | ve); 1151 } 1152 1153 static void 1154 Luv32toXYZ(LogLuvState* sp, uint8* op, tmsize_t n) 1155 { 1156 uint32* luv = (uint32*) sp->tbuf; 1157 float* xyz = (float*) op; 1158 1159 while (n-- > 0) { 1160 LogLuv32toXYZ(*luv++, xyz); 1161 xyz += 3; 1162 } 1163 } 1164 1165 static void 1166 Luv32toLuv48(LogLuvState* sp, uint8* op, tmsize_t n) 1167 { 1168 uint32* luv = (uint32*) sp->tbuf; 1169 int16* luv3 = (int16*) op; 1170 1171 while (n-- > 0) { 1172 double u, v; 1173 1174 *luv3++ = (int16)(*luv >> 16); 1175 u = 1./UVSCALE * ((*luv>>8 & 0xff) + .5); 1176 v = 1./UVSCALE * ((*luv & 0xff) + .5); 1177 *luv3++ = (int16)(u * (1L<<15)); 1178 *luv3++ = (int16)(v * (1L<<15)); 1179 luv++; 1180 } 1181 } 1182 1183 static void 1184 Luv32toRGB(LogLuvState* sp, uint8* op, tmsize_t n) 1185 { 1186 uint32* luv = (uint32*) sp->tbuf; 1187 uint8* rgb = (uint8*) op; 1188 1189 while (n-- > 0) { 1190 float xyz[3]; 1191 1192 LogLuv32toXYZ(*luv++, xyz); 1193 XYZtoRGB24(xyz, rgb); 1194 rgb += 3; 1195 } 1196 } 1197 1198 static void 1199 Luv32fromXYZ(LogLuvState* sp, uint8* op, tmsize_t n) 1200 { 1201 uint32* luv = (uint32*) sp->tbuf; 1202 float* xyz = (float*) op; 1203 1204 while (n-- > 0) { 1205 *luv++ = LogLuv32fromXYZ(xyz, sp->encode_meth); 1206 xyz += 3; 1207 } 1208 } 1209 1210 static void 1211 Luv32fromLuv48(LogLuvState* sp, uint8* op, tmsize_t n) 1212 { 1213 uint32* luv = (uint32*) sp->tbuf; 1214 int16* luv3 = (int16*) op; 1215 1216 if (sp->encode_meth == SGILOGENCODE_NODITHER) { 1217 while (n-- > 0) { 1218 *luv++ = (uint32)luv3[0] << 16 | 1219 (luv3[1]*(uint32)(UVSCALE+.5) >> 7 & 0xff00) | 1220 (luv3[2]*(uint32)(UVSCALE+.5) >> 15 & 0xff); 1221 luv3 += 3; 1222 } 1223 return; 1224 } 1225 while (n-- > 0) { 1226 *luv++ = (uint32)luv3[0] << 16 | 1227 (itrunc(luv3[1]*(UVSCALE/(1<<15)), sp->encode_meth) << 8 & 0xff00) | 1228 (itrunc(luv3[2]*(UVSCALE/(1<<15)), sp->encode_meth) & 0xff); 1229 luv3 += 3; 1230 } 1231 } 1232 1233 static void 1234 _logLuvNop(LogLuvState* sp, uint8* op, tmsize_t n) 1235 { 1236 (void) sp; (void) op; (void) n; 1237 } 1238 1239 static int 1240 LogL16GuessDataFmt(TIFFDirectory *td) 1241 { 1242 #define PACK(s,b,f) (((b)<<6)|((s)<<3)|(f)) 1243 switch (PACK(td->td_samplesperpixel, td->td_bitspersample, td->td_sampleformat)) { 1244 case PACK(1, 32, SAMPLEFORMAT_IEEEFP): 1245 return (SGILOGDATAFMT_FLOAT); 1246 case PACK(1, 16, SAMPLEFORMAT_VOID): 1247 case PACK(1, 16, SAMPLEFORMAT_INT): 1248 case PACK(1, 16, SAMPLEFORMAT_UINT): 1249 return (SGILOGDATAFMT_16BIT); 1250 case PACK(1, 8, SAMPLEFORMAT_VOID): 1251 case PACK(1, 8, SAMPLEFORMAT_UINT): 1252 return (SGILOGDATAFMT_8BIT); 1253 } 1254 #undef PACK 1255 return (SGILOGDATAFMT_UNKNOWN); 1256 } 1257 1258 static tmsize_t 1259 multiply_ms(tmsize_t m1, tmsize_t m2) 1260 { 1261 tmsize_t bytes = m1 * m2; 1262 1263 if (m1 && bytes / m1 != m2) 1264 bytes = 0; 1265 1266 return bytes; 1267 } 1268 1269 static int 1270 LogL16InitState(TIFF* tif) 1271 { 1272 static const char module[] = "LogL16InitState"; 1273 TIFFDirectory *td = &tif->tif_dir; 1274 LogLuvState* sp = DecoderState(tif); 1275 1276 assert(sp != NULL); 1277 assert(td->td_photometric == PHOTOMETRIC_LOGL); 1278 1279 /* for some reason, we can't do this in TIFFInitLogL16 */ 1280 if (sp->user_datafmt == SGILOGDATAFMT_UNKNOWN) 1281 sp->user_datafmt = LogL16GuessDataFmt(td); 1282 switch (sp->user_datafmt) { 1283 case SGILOGDATAFMT_FLOAT: 1284 sp->pixel_size = sizeof (float); 1285 break; 1286 case SGILOGDATAFMT_16BIT: 1287 sp->pixel_size = sizeof (int16); 1288 break; 1289 case SGILOGDATAFMT_8BIT: 1290 sp->pixel_size = sizeof (uint8); 1291 break; 1292 default: 1293 TIFFErrorExt(tif->tif_clientdata, module, 1294 "No support for converting user data format to LogL"); 1295 return (0); 1296 } 1297 if( isTiled(tif) ) 1298 sp->tbuflen = multiply_ms(td->td_tilewidth, td->td_tilelength); 1299 else 1300 sp->tbuflen = multiply_ms(td->td_imagewidth, td->td_rowsperstrip); 1301 if (multiply_ms(sp->tbuflen, sizeof (int16)) == 0 || 1302 (sp->tbuf = (uint8*) _TIFFmalloc(sp->tbuflen * sizeof (int16))) == NULL) { 1303 TIFFErrorExt(tif->tif_clientdata, module, "No space for SGILog translation buffer"); 1304 return (0); 1305 } 1306 return (1); 1307 } 1308 1309 static int 1310 LogLuvGuessDataFmt(TIFFDirectory *td) 1311 { 1312 int guess; 1313 1314 /* 1315 * If the user didn't tell us their datafmt, 1316 * take our best guess from the bitspersample. 1317 */ 1318 #define PACK(a,b) (((a)<<3)|(b)) 1319 switch (PACK(td->td_bitspersample, td->td_sampleformat)) { 1320 case PACK(32, SAMPLEFORMAT_IEEEFP): 1321 guess = SGILOGDATAFMT_FLOAT; 1322 break; 1323 case PACK(32, SAMPLEFORMAT_VOID): 1324 case PACK(32, SAMPLEFORMAT_UINT): 1325 case PACK(32, SAMPLEFORMAT_INT): 1326 guess = SGILOGDATAFMT_RAW; 1327 break; 1328 case PACK(16, SAMPLEFORMAT_VOID): 1329 case PACK(16, SAMPLEFORMAT_INT): 1330 case PACK(16, SAMPLEFORMAT_UINT): 1331 guess = SGILOGDATAFMT_16BIT; 1332 break; 1333 case PACK( 8, SAMPLEFORMAT_VOID): 1334 case PACK( 8, SAMPLEFORMAT_UINT): 1335 guess = SGILOGDATAFMT_8BIT; 1336 break; 1337 default: 1338 guess = SGILOGDATAFMT_UNKNOWN; 1339 break; 1340 #undef PACK 1341 } 1342 /* 1343 * Double-check samples per pixel. 1344 */ 1345 switch (td->td_samplesperpixel) { 1346 case 1: 1347 if (guess != SGILOGDATAFMT_RAW) 1348 guess = SGILOGDATAFMT_UNKNOWN; 1349 break; 1350 case 3: 1351 if (guess == SGILOGDATAFMT_RAW) 1352 guess = SGILOGDATAFMT_UNKNOWN; 1353 break; 1354 default: 1355 guess = SGILOGDATAFMT_UNKNOWN; 1356 break; 1357 } 1358 return (guess); 1359 } 1360 1361 static int 1362 LogLuvInitState(TIFF* tif) 1363 { 1364 static const char module[] = "LogLuvInitState"; 1365 TIFFDirectory* td = &tif->tif_dir; 1366 LogLuvState* sp = DecoderState(tif); 1367 1368 assert(sp != NULL); 1369 assert(td->td_photometric == PHOTOMETRIC_LOGLUV); 1370 1371 /* for some reason, we can't do this in TIFFInitLogLuv */ 1372 if (td->td_planarconfig != PLANARCONFIG_CONTIG) { 1373 TIFFErrorExt(tif->tif_clientdata, module, 1374 "SGILog compression cannot handle non-contiguous data"); 1375 return (0); 1376 } 1377 if (sp->user_datafmt == SGILOGDATAFMT_UNKNOWN) 1378 sp->user_datafmt = LogLuvGuessDataFmt(td); 1379 switch (sp->user_datafmt) { 1380 case SGILOGDATAFMT_FLOAT: 1381 sp->pixel_size = 3*sizeof (float); 1382 break; 1383 case SGILOGDATAFMT_16BIT: 1384 sp->pixel_size = 3*sizeof (int16); 1385 break; 1386 case SGILOGDATAFMT_RAW: 1387 sp->pixel_size = sizeof (uint32); 1388 break; 1389 case SGILOGDATAFMT_8BIT: 1390 sp->pixel_size = 3*sizeof (uint8); 1391 break; 1392 default: 1393 TIFFErrorExt(tif->tif_clientdata, module, 1394 "No support for converting user data format to LogLuv"); 1395 return (0); 1396 } 1397 if( isTiled(tif) ) 1398 sp->tbuflen = multiply_ms(td->td_tilewidth, td->td_tilelength); 1399 else 1400 sp->tbuflen = multiply_ms(td->td_imagewidth, td->td_rowsperstrip); 1401 if (multiply_ms(sp->tbuflen, sizeof (uint32)) == 0 || 1402 (sp->tbuf = (uint8*) _TIFFmalloc(sp->tbuflen * sizeof (uint32))) == NULL) { 1403 TIFFErrorExt(tif->tif_clientdata, module, "No space for SGILog translation buffer"); 1404 return (0); 1405 } 1406 return (1); 1407 } 1408 1409 static int 1410 LogLuvFixupTags(TIFF* tif) 1411 { 1412 (void) tif; 1413 return (1); 1414 } 1415 1416 static int 1417 LogLuvSetupDecode(TIFF* tif) 1418 { 1419 static const char module[] = "LogLuvSetupDecode"; 1420 LogLuvState* sp = DecoderState(tif); 1421 TIFFDirectory* td = &tif->tif_dir; 1422 1423 tif->tif_postdecode = _TIFFNoPostDecode; 1424 switch (td->td_photometric) { 1425 case PHOTOMETRIC_LOGLUV: 1426 if (!LogLuvInitState(tif)) 1427 break; 1428 if (td->td_compression == COMPRESSION_SGILOG24) { 1429 tif->tif_decoderow = LogLuvDecode24; 1430 switch (sp->user_datafmt) { 1431 case SGILOGDATAFMT_FLOAT: 1432 sp->tfunc = Luv24toXYZ; 1433 break; 1434 case SGILOGDATAFMT_16BIT: 1435 sp->tfunc = Luv24toLuv48; 1436 break; 1437 case SGILOGDATAFMT_8BIT: 1438 sp->tfunc = Luv24toRGB; 1439 break; 1440 } 1441 } else { 1442 tif->tif_decoderow = LogLuvDecode32; 1443 switch (sp->user_datafmt) { 1444 case SGILOGDATAFMT_FLOAT: 1445 sp->tfunc = Luv32toXYZ; 1446 break; 1447 case SGILOGDATAFMT_16BIT: 1448 sp->tfunc = Luv32toLuv48; 1449 break; 1450 case SGILOGDATAFMT_8BIT: 1451 sp->tfunc = Luv32toRGB; 1452 break; 1453 } 1454 } 1455 return (1); 1456 case PHOTOMETRIC_LOGL: 1457 if (!LogL16InitState(tif)) 1458 break; 1459 tif->tif_decoderow = LogL16Decode; 1460 switch (sp->user_datafmt) { 1461 case SGILOGDATAFMT_FLOAT: 1462 sp->tfunc = L16toY; 1463 break; 1464 case SGILOGDATAFMT_8BIT: 1465 sp->tfunc = L16toGry; 1466 break; 1467 } 1468 return (1); 1469 default: 1470 TIFFErrorExt(tif->tif_clientdata, module, 1471 "Inappropriate photometric interpretation %d for SGILog compression; %s", 1472 td->td_photometric, "must be either LogLUV or LogL"); 1473 break; 1474 } 1475 return (0); 1476 } 1477 1478 static int 1479 LogLuvSetupEncode(TIFF* tif) 1480 { 1481 static const char module[] = "LogLuvSetupEncode"; 1482 LogLuvState* sp = EncoderState(tif); 1483 TIFFDirectory* td = &tif->tif_dir; 1484 1485 switch (td->td_photometric) { 1486 case PHOTOMETRIC_LOGLUV: 1487 if (!LogLuvInitState(tif)) 1488 break; 1489 if (td->td_compression == COMPRESSION_SGILOG24) { 1490 tif->tif_encoderow = LogLuvEncode24; 1491 switch (sp->user_datafmt) { 1492 case SGILOGDATAFMT_FLOAT: 1493 sp->tfunc = Luv24fromXYZ; 1494 break; 1495 case SGILOGDATAFMT_16BIT: 1496 sp->tfunc = Luv24fromLuv48; 1497 break; 1498 case SGILOGDATAFMT_RAW: 1499 break; 1500 default: 1501 goto notsupported; 1502 } 1503 } else { 1504 tif->tif_encoderow = LogLuvEncode32; 1505 switch (sp->user_datafmt) { 1506 case SGILOGDATAFMT_FLOAT: 1507 sp->tfunc = Luv32fromXYZ; 1508 break; 1509 case SGILOGDATAFMT_16BIT: 1510 sp->tfunc = Luv32fromLuv48; 1511 break; 1512 case SGILOGDATAFMT_RAW: 1513 break; 1514 default: 1515 goto notsupported; 1516 } 1517 } 1518 break; 1519 case PHOTOMETRIC_LOGL: 1520 if (!LogL16InitState(tif)) 1521 break; 1522 tif->tif_encoderow = LogL16Encode; 1523 switch (sp->user_datafmt) { 1524 case SGILOGDATAFMT_FLOAT: 1525 sp->tfunc = L16fromY; 1526 break; 1527 case SGILOGDATAFMT_16BIT: 1528 break; 1529 default: 1530 goto notsupported; 1531 } 1532 break; 1533 default: 1534 TIFFErrorExt(tif->tif_clientdata, module, 1535 "Inappropriate photometric interpretation %d for SGILog compression; %s", 1536 td->td_photometric, "must be either LogLUV or LogL"); 1537 break; 1538 } 1539 return (1); 1540 notsupported: 1541 TIFFErrorExt(tif->tif_clientdata, module, 1542 "SGILog compression supported only for %s, or raw data", 1543 td->td_photometric == PHOTOMETRIC_LOGL ? "Y, L" : "XYZ, Luv"); 1544 return (0); 1545 } 1546 1547 static void 1548 LogLuvClose(TIFF* tif) 1549 { 1550 TIFFDirectory *td = &tif->tif_dir; 1551 1552 /* 1553 * For consistency, we always want to write out the same 1554 * bitspersample and sampleformat for our TIFF file, 1555 * regardless of the data format being used by the application. 1556 * Since this routine is called after tags have been set but 1557 * before they have been recorded in the file, we reset them here. 1558 */ 1559 td->td_samplesperpixel = 1560 (td->td_photometric == PHOTOMETRIC_LOGL) ? 1 : 3; 1561 td->td_bitspersample = 16; 1562 td->td_sampleformat = SAMPLEFORMAT_INT; 1563 } 1564 1565 static void 1566 LogLuvCleanup(TIFF* tif) 1567 { 1568 LogLuvState* sp = (LogLuvState *)tif->tif_data; 1569 1570 assert(sp != 0); 1571 1572 tif->tif_tagmethods.vgetfield = sp->vgetparent; 1573 tif->tif_tagmethods.vsetfield = sp->vsetparent; 1574 1575 if (sp->tbuf) 1576 _TIFFfree(sp->tbuf); 1577 _TIFFfree(sp); 1578 tif->tif_data = NULL; 1579 1580 _TIFFSetDefaultCompressionState(tif); 1581 } 1582 1583 static int 1584 LogLuvVSetField(TIFF* tif, uint32 tag, va_list ap) 1585 { 1586 static const char module[] = "LogLuvVSetField"; 1587 LogLuvState* sp = DecoderState(tif); 1588 int bps, fmt; 1589 1590 switch (tag) { 1591 case TIFFTAG_SGILOGDATAFMT: 1592 sp->user_datafmt = (int) va_arg(ap, int); 1593 /* 1594 * Tweak the TIFF header so that the rest of libtiff knows what 1595 * size of data will be passed between app and library, and 1596 * assume that the app knows what it is doing and is not 1597 * confused by these header manipulations... 1598 */ 1599 switch (sp->user_datafmt) { 1600 case SGILOGDATAFMT_FLOAT: 1601 bps = 32, fmt = SAMPLEFORMAT_IEEEFP; 1602 break; 1603 case SGILOGDATAFMT_16BIT: 1604 bps = 16, fmt = SAMPLEFORMAT_INT; 1605 break; 1606 case SGILOGDATAFMT_RAW: 1607 bps = 32, fmt = SAMPLEFORMAT_UINT; 1608 TIFFSetField(tif, TIFFTAG_SAMPLESPERPIXEL, 1); 1609 break; 1610 case SGILOGDATAFMT_8BIT: 1611 bps = 8, fmt = SAMPLEFORMAT_UINT; 1612 break; 1613 default: 1614 TIFFErrorExt(tif->tif_clientdata, tif->tif_name, 1615 "Unknown data format %d for LogLuv compression", 1616 sp->user_datafmt); 1617 return (0); 1618 } 1619 TIFFSetField(tif, TIFFTAG_BITSPERSAMPLE, bps); 1620 TIFFSetField(tif, TIFFTAG_SAMPLEFORMAT, fmt); 1621 /* 1622 * Must recalculate sizes should bits/sample change. 1623 */ 1624 tif->tif_tilesize = isTiled(tif) ? TIFFTileSize(tif) : (tmsize_t) -1; 1625 tif->tif_scanlinesize = TIFFScanlineSize(tif); 1626 return (1); 1627 case TIFFTAG_SGILOGENCODE: 1628 sp->encode_meth = (int) va_arg(ap, int); 1629 if (sp->encode_meth != SGILOGENCODE_NODITHER && 1630 sp->encode_meth != SGILOGENCODE_RANDITHER) { 1631 TIFFErrorExt(tif->tif_clientdata, module, 1632 "Unknown encoding %d for LogLuv compression", 1633 sp->encode_meth); 1634 return (0); 1635 } 1636 return (1); 1637 default: 1638 return (*sp->vsetparent)(tif, tag, ap); 1639 } 1640 } 1641 1642 static int 1643 LogLuvVGetField(TIFF* tif, uint32 tag, va_list ap) 1644 { 1645 LogLuvState *sp = (LogLuvState *)tif->tif_data; 1646 1647 switch (tag) { 1648 case TIFFTAG_SGILOGDATAFMT: 1649 *va_arg(ap, int*) = sp->user_datafmt; 1650 return (1); 1651 default: 1652 return (*sp->vgetparent)(tif, tag, ap); 1653 } 1654 } 1655 1656 static const TIFFField LogLuvFields[] = { 1657 { TIFFTAG_SGILOGDATAFMT, 0, 0, TIFF_SHORT, 0, TIFF_SETGET_INT, TIFF_SETGET_UNDEFINED, FIELD_PSEUDO, TRUE, FALSE, "SGILogDataFmt", NULL}, 1658 { TIFFTAG_SGILOGENCODE, 0, 0, TIFF_SHORT, 0, TIFF_SETGET_INT, TIFF_SETGET_UNDEFINED, FIELD_PSEUDO, TRUE, FALSE, "SGILogEncode", NULL} 1659 }; 1660 1661 int 1662 TIFFInitSGILog(TIFF* tif, int scheme) 1663 { 1664 static const char module[] = "TIFFInitSGILog"; 1665 LogLuvState* sp; 1666 1667 assert(scheme == COMPRESSION_SGILOG24 || scheme == COMPRESSION_SGILOG); 1668 1669 /* 1670 * Merge codec-specific tag information. 1671 */ 1672 if (!_TIFFMergeFields(tif, LogLuvFields, 1673 TIFFArrayCount(LogLuvFields))) { 1674 TIFFErrorExt(tif->tif_clientdata, module, 1675 "Merging SGILog codec-specific tags failed"); 1676 return 0; 1677 } 1678 1679 /* 1680 * Allocate state block so tag methods have storage to record values. 1681 */ 1682 tif->tif_data = (uint8*) _TIFFmalloc(sizeof (LogLuvState)); 1683 if (tif->tif_data == NULL) 1684 goto bad; 1685 sp = (LogLuvState*) tif->tif_data; 1686 _TIFFmemset((void*)sp, 0, sizeof (*sp)); 1687 sp->user_datafmt = SGILOGDATAFMT_UNKNOWN; 1688 sp->encode_meth = (scheme == COMPRESSION_SGILOG24) ? 1689 SGILOGENCODE_RANDITHER : SGILOGENCODE_NODITHER; 1690 sp->tfunc = _logLuvNop; 1691 1692 /* 1693 * Install codec methods. 1694 * NB: tif_decoderow & tif_encoderow are filled 1695 * in at setup time. 1696 */ 1697 tif->tif_fixuptags = LogLuvFixupTags; 1698 tif->tif_setupdecode = LogLuvSetupDecode; 1699 tif->tif_decodestrip = LogLuvDecodeStrip; 1700 tif->tif_decodetile = LogLuvDecodeTile; 1701 tif->tif_setupencode = LogLuvSetupEncode; 1702 tif->tif_encodestrip = LogLuvEncodeStrip; 1703 tif->tif_encodetile = LogLuvEncodeTile; 1704 tif->tif_close = LogLuvClose; 1705 tif->tif_cleanup = LogLuvCleanup; 1706 1707 /* 1708 * Override parent get/set field methods. 1709 */ 1710 sp->vgetparent = tif->tif_tagmethods.vgetfield; 1711 tif->tif_tagmethods.vgetfield = LogLuvVGetField; /* hook for codec tags */ 1712 sp->vsetparent = tif->tif_tagmethods.vsetfield; 1713 tif->tif_tagmethods.vsetfield = LogLuvVSetField; /* hook for codec tags */ 1714 1715 return (1); 1716 bad: 1717 TIFFErrorExt(tif->tif_clientdata, module, 1718 "%s: No space for LogLuv state block", tif->tif_name); 1719 return (0); 1720 } 1721 #endif /* LOGLUV_SUPPORT */ 1722 1723 /* vim: set ts=8 sts=8 sw=8 noet: */ 1724 /* 1725 * Local Variables: 1726 * mode: c 1727 * c-basic-offset: 8 1728 * fill-column: 78 1729 * End: 1730 */ 1731
