1 /* $Id: tif_luv.c,v 1.47 2017-05-14 10:17:27 erouault Exp $ */ 2 3 /* 4 * Copyright (c) 1997 Greg Ward Larson 5 * Copyright (c) 1997 Silicon Graphics, Inc. 6 * 7 * Permission to use, copy, modify, distribute, and sell this software and 8 * its documentation for any purpose is hereby granted without fee, provided 9 * that (i) the above copyright notices and this permission notice appear in 10 * all copies of the software and related documentation, and (ii) the names of 11 * Sam Leffler, Greg Larson and Silicon Graphics may not be used in any 12 * advertising or publicity relating to the software without the specific, 13 * prior written permission of Sam Leffler, Greg Larson and Silicon Graphics. 14 * 15 * THE SOFTWARE IS PROVIDED "AS-IS" AND WITHOUT WARRANTY OF ANY KIND, 16 * EXPRESS, IMPLIED OR OTHERWISE, INCLUDING WITHOUT LIMITATION, ANY 17 * WARRANTY OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE. 18 * 19 * IN NO EVENT SHALL SAM LEFFLER, GREG LARSON OR SILICON GRAPHICS BE LIABLE 20 * FOR ANY SPECIAL, INCIDENTAL, INDIRECT OR CONSEQUENTIAL DAMAGES OF ANY KIND, 21 * OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, 22 * WHETHER OR NOT ADVISED OF THE POSSIBILITY OF DAMAGE, AND ON ANY THEORY OF 23 * LIABILITY, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE 24 * OF THIS SOFTWARE. 25 */ 26 27 #include "tiffiop.h" 28 #ifdef LOGLUV_SUPPORT 29 30 /* 31 * TIFF Library. 32 * LogLuv compression support for high dynamic range images. 33 * 34 * Contributed by Greg Larson. 35 * 36 * LogLuv image support uses the TIFF library to store 16 or 10-bit 37 * log luminance values with 8 bits each of u and v or a 14-bit index. 38 * 39 * The codec can take as input and produce as output 32-bit IEEE float values 40 * as well as 16-bit integer values. A 16-bit luminance is interpreted 41 * as a sign bit followed by a 15-bit integer that is converted 42 * to and from a linear magnitude using the transformation: 43 * 44 * L = 2^( (Le+.5)/256 - 64 ) # real from 15-bit 45 * 46 * Le = floor( 256*(log2(L) + 64) ) # 15-bit from real 47 * 48 * The actual conversion to world luminance units in candelas per sq. meter 49 * requires an additional multiplier, which is stored in the TIFFTAG_STONITS. 50 * This value is usually set such that a reasonable exposure comes from 51 * clamping decoded luminances above 1 to 1 in the displayed image. 52 * 53 * The 16-bit values for u and v may be converted to real values by dividing 54 * each by 32768. (This allows for negative values, which aren't useful as 55 * far as we know, but are left in case of future improvements in human 56 * color vision.) 57 * 58 * Conversion from (u,v), which is actually the CIE (u',v') system for 59 * you color scientists, is accomplished by the following transformation: 60 * 61 * u = 4*x / (-2*x + 12*y + 3) 62 * v = 9*y / (-2*x + 12*y + 3) 63 * 64 * x = 9*u / (6*u - 16*v + 12) 65 * y = 4*v / (6*u - 16*v + 12) 66 * 67 * This process is greatly simplified by passing 32-bit IEEE floats 68 * for each of three CIE XYZ coordinates. The codec then takes care 69 * of conversion to and from LogLuv, though the application is still 70 * responsible for interpreting the TIFFTAG_STONITS calibration factor. 71 * 72 * By definition, a CIE XYZ vector of [1 1 1] corresponds to a neutral white 73 * point of (x,y)=(1/3,1/3). However, most color systems assume some other 74 * white point, such as D65, and an absolute color conversion to XYZ then 75 * to another color space with a different white point may introduce an 76 * unwanted color cast to the image. It is often desirable, therefore, to 77 * perform a white point conversion that maps the input white to [1 1 1] 78 * in XYZ, then record the original white point using the TIFFTAG_WHITEPOINT 79 * tag value. A decoder that demands absolute color calibration may use 80 * this white point tag to get back the original colors, but usually it 81 * will be ignored and the new white point will be used instead that 82 * matches the output color space. 83 * 84 * Pixel information is compressed into one of two basic encodings, depending 85 * on the setting of the compression tag, which is one of COMPRESSION_SGILOG 86 * or COMPRESSION_SGILOG24. For COMPRESSION_SGILOG, greyscale data is 87 * stored as: 88 * 89 * 1 15 90 * |-+---------------| 91 * 92 * COMPRESSION_SGILOG color data is stored as: 93 * 94 * 1 15 8 8 95 * |-+---------------|--------+--------| 96 * S Le ue ve 97 * 98 * For the 24-bit COMPRESSION_SGILOG24 color format, the data is stored as: 99 * 100 * 10 14 101 * |----------|--------------| 102 * Le' Ce 103 * 104 * There is no sign bit in the 24-bit case, and the (u,v) chromaticity is 105 * encoded as an index for optimal color resolution. The 10 log bits are 106 * defined by the following conversions: 107 * 108 * L = 2^((Le'+.5)/64 - 12) # real from 10-bit 109 * 110 * Le' = floor( 64*(log2(L) + 12) ) # 10-bit from real 111 * 112 * The 10 bits of the smaller format may be converted into the 15 bits of 113 * the larger format by multiplying by 4 and adding 13314. Obviously, 114 * a smaller range of magnitudes is covered (about 5 orders of magnitude 115 * instead of 38), and the lack of a sign bit means that negative luminances 116 * are not allowed. (Well, they aren't allowed in the real world, either, 117 * but they are useful for certain types of image processing.) 118 * 119 * The desired user format is controlled by the setting the internal 120 * pseudo tag TIFFTAG_SGILOGDATAFMT to one of: 121 * SGILOGDATAFMT_FLOAT = IEEE 32-bit float XYZ values 122 * SGILOGDATAFMT_16BIT = 16-bit integer encodings of logL, u and v 123 * Raw data i/o is also possible using: 124 * SGILOGDATAFMT_RAW = 32-bit unsigned integer with encoded pixel 125 * In addition, the following decoding is provided for ease of display: 126 * SGILOGDATAFMT_8BIT = 8-bit default RGB gamma-corrected values 127 * 128 * For grayscale images, we provide the following data formats: 129 * SGILOGDATAFMT_FLOAT = IEEE 32-bit float Y values 130 * SGILOGDATAFMT_16BIT = 16-bit integer w/ encoded luminance 131 * SGILOGDATAFMT_8BIT = 8-bit gray monitor values 132 * 133 * Note that the COMPRESSION_SGILOG applies a simple run-length encoding 134 * scheme by separating the logL, u and v bytes for each row and applying 135 * a PackBits type of compression. Since the 24-bit encoding is not 136 * adaptive, the 32-bit color format takes less space in many cases. 137 * 138 * Further control is provided over the conversion from higher-resolution 139 * formats to final encoded values through the pseudo tag 140 * TIFFTAG_SGILOGENCODE: 141 * SGILOGENCODE_NODITHER = do not dither encoded values 142 * SGILOGENCODE_RANDITHER = apply random dithering during encoding 143 * 144 * The default value of this tag is SGILOGENCODE_NODITHER for 145 * COMPRESSION_SGILOG to maximize run-length encoding and 146 * SGILOGENCODE_RANDITHER for COMPRESSION_SGILOG24 to turn 147 * quantization errors into noise. 148 */ 149 150 #include <stdio.h> 151 #include <stdlib.h> 152 #include <math.h> 153 154 /* 155 * State block for each open TIFF 156 * file using LogLuv compression/decompression. 157 */ 158 typedef struct logLuvState LogLuvState; 159 160 struct logLuvState { 161 int encoder_state; /* 1 if encoder correctly initialized */ 162 int user_datafmt; /* user data format */ 163 int encode_meth; /* encoding method */ 164 int pixel_size; /* bytes per pixel */ 165 166 uint8* tbuf; /* translation buffer */ 167 tmsize_t tbuflen; /* buffer length */ 168 void (*tfunc)(LogLuvState*, uint8*, tmsize_t); 169 170 TIFFVSetMethod vgetparent; /* super-class method */ 171 TIFFVSetMethod vsetparent; /* super-class method */ 172 }; 173 174 #define DecoderState(tif) ((LogLuvState*) (tif)->tif_data) 175 #define EncoderState(tif) ((LogLuvState*) (tif)->tif_data) 176 177 #define SGILOGDATAFMT_UNKNOWN -1 178 179 #define MINRUN 4 /* minimum run length */ 180 181 /* 182 * Decode a string of 16-bit gray pixels. 183 */ 184 static int 185 LogL16Decode(TIFF* tif, uint8* op, tmsize_t occ, uint16 s) 186 { 187 static const char module[] = "LogL16Decode"; 188 LogLuvState* sp = DecoderState(tif); 189 int shft; 190 tmsize_t i; 191 tmsize_t npixels; 192 unsigned char* bp; 193 int16* tp; 194 int16 b; 195 tmsize_t cc; 196 int rc; 197 198 assert(s == 0); 199 assert(sp != NULL); 200 201 npixels = occ / sp->pixel_size; 202 203 if (sp->user_datafmt == SGILOGDATAFMT_16BIT) 204 tp = (int16*) op; 205 else { 206 if(sp->tbuflen < npixels) { 207 TIFFErrorExt(tif->tif_clientdata, module, 208 "Translation buffer too short"); 209 return (0); 210 } 211 tp = (int16*) sp->tbuf; 212 } 213 _TIFFmemset((void*) tp, 0, npixels*sizeof (tp[0])); 214 215 bp = (unsigned char*) tif->tif_rawcp; 216 cc = tif->tif_rawcc; 217 /* get each byte string */ 218 for (shft = 2*8; (shft -= 8) >= 0; ) { 219 for (i = 0; i < npixels && cc > 0; ) { 220 if (*bp >= 128) { /* run */ 221 if( cc < 2 ) 222 break; 223 rc = *bp++ + (2-128); 224 b = (int16)(*bp++ << shft); 225 cc -= 2; 226 while (rc-- && i < npixels) 227 tp[i++] |= b; 228 } else { /* non-run */ 229 rc = *bp++; /* nul is noop */ 230 while (--cc && rc-- && i < npixels) 231 tp[i++] |= (int16)*bp++ << shft; 232 } 233 } 234 if (i != npixels) { 235 #if defined(__WIN32__) && (defined(_MSC_VER) || defined(__MINGW32__)) 236 TIFFErrorExt(tif->tif_clientdata, module, 237 "Not enough data at row %lu (short %I64d pixels)", 238 (unsigned long) tif->tif_row, 239 (unsigned __int64) (npixels - i)); 240 #else 241 TIFFErrorExt(tif->tif_clientdata, module, 242 "Not enough data at row %lu (short %llu pixels)", 243 (unsigned long) tif->tif_row, 244 (unsigned long long) (npixels - i)); 245 #endif 246 tif->tif_rawcp = (uint8*) bp; 247 tif->tif_rawcc = cc; 248 return (0); 249 } 250 } 251 (*sp->tfunc)(sp, op, npixels); 252 tif->tif_rawcp = (uint8*) bp; 253 tif->tif_rawcc = cc; 254 return (1); 255 } 256 257 /* 258 * Decode a string of 24-bit pixels. 259 */ 260 static int 261 LogLuvDecode24(TIFF* tif, uint8* op, tmsize_t occ, uint16 s) 262 { 263 static const char module[] = "LogLuvDecode24"; 264 LogLuvState* sp = DecoderState(tif); 265 tmsize_t cc; 266 tmsize_t i; 267 tmsize_t npixels; 268 unsigned char* bp; 269 uint32* tp; 270 271 assert(s == 0); 272 assert(sp != NULL); 273 274 npixels = occ / sp->pixel_size; 275 276 if (sp->user_datafmt == SGILOGDATAFMT_RAW) 277 tp = (uint32 *)op; 278 else { 279 if(sp->tbuflen < npixels) { 280 TIFFErrorExt(tif->tif_clientdata, module, 281 "Translation buffer too short"); 282 return (0); 283 } 284 tp = (uint32 *) sp->tbuf; 285 } 286 /* copy to array of uint32 */ 287 bp = (unsigned char*) tif->tif_rawcp; 288 cc = tif->tif_rawcc; 289 for (i = 0; i < npixels && cc >= 3; i++) { 290 tp[i] = bp[0] << 16 | bp[1] << 8 | bp[2]; 291 bp += 3; 292 cc -= 3; 293 } 294 tif->tif_rawcp = (uint8*) bp; 295 tif->tif_rawcc = cc; 296 if (i != npixels) { 297 #if defined(__WIN32__) && (defined(_MSC_VER) || defined(__MINGW32__)) 298 TIFFErrorExt(tif->tif_clientdata, module, 299 "Not enough data at row %lu (short %I64d pixels)", 300 (unsigned long) tif->tif_row, 301 (unsigned __int64) (npixels - i)); 302 #else 303 TIFFErrorExt(tif->tif_clientdata, module, 304 "Not enough data at row %lu (short %llu pixels)", 305 (unsigned long) tif->tif_row, 306 (unsigned long long) (npixels - i)); 307 #endif 308 return (0); 309 } 310 (*sp->tfunc)(sp, op, npixels); 311 return (1); 312 } 313 314 /* 315 * Decode a string of 32-bit pixels. 316 */ 317 static int 318 LogLuvDecode32(TIFF* tif, uint8* op, tmsize_t occ, uint16 s) 319 { 320 static const char module[] = "LogLuvDecode32"; 321 LogLuvState* sp; 322 int shft; 323 tmsize_t i; 324 tmsize_t npixels; 325 unsigned char* bp; 326 uint32* tp; 327 uint32 b; 328 tmsize_t cc; 329 int rc; 330 331 assert(s == 0); 332 sp = DecoderState(tif); 333 assert(sp != NULL); 334 335 npixels = occ / sp->pixel_size; 336 337 if (sp->user_datafmt == SGILOGDATAFMT_RAW) 338 tp = (uint32*) op; 339 else { 340 if(sp->tbuflen < npixels) { 341 TIFFErrorExt(tif->tif_clientdata, module, 342 "Translation buffer too short"); 343 return (0); 344 } 345 tp = (uint32*) sp->tbuf; 346 } 347 _TIFFmemset((void*) tp, 0, npixels*sizeof (tp[0])); 348 349 bp = (unsigned char*) tif->tif_rawcp; 350 cc = tif->tif_rawcc; 351 /* get each byte string */ 352 for (shft = 4*8; (shft -= 8) >= 0; ) { 353 for (i = 0; i < npixels && cc > 0; ) { 354 if (*bp >= 128) { /* run */ 355 if( cc < 2 ) 356 break; 357 rc = *bp++ + (2-128); 358 b = (uint32)*bp++ << shft; 359 cc -= 2; 360 while (rc-- && i < npixels) 361 tp[i++] |= b; 362 } else { /* non-run */ 363 rc = *bp++; /* nul is noop */ 364 while (--cc && rc-- && i < npixels) 365 tp[i++] |= (uint32)*bp++ << shft; 366 } 367 } 368 if (i != npixels) { 369 #if defined(__WIN32__) && (defined(_MSC_VER) || defined(__MINGW32__)) 370 TIFFErrorExt(tif->tif_clientdata, module, 371 "Not enough data at row %lu (short %I64d pixels)", 372 (unsigned long) tif->tif_row, 373 (unsigned __int64) (npixels - i)); 374 #else 375 TIFFErrorExt(tif->tif_clientdata, module, 376 "Not enough data at row %lu (short %llu pixels)", 377 (unsigned long) tif->tif_row, 378 (unsigned long long) (npixels - i)); 379 #endif 380 tif->tif_rawcp = (uint8*) bp; 381 tif->tif_rawcc = cc; 382 return (0); 383 } 384 } 385 (*sp->tfunc)(sp, op, npixels); 386 tif->tif_rawcp = (uint8*) bp; 387 tif->tif_rawcc = cc; 388 return (1); 389 } 390 391 /* 392 * Decode a strip of pixels. We break it into rows to 393 * maintain synchrony with the encode algorithm, which 394 * is row by row. 395 */ 396 static int 397 LogLuvDecodeStrip(TIFF* tif, uint8* bp, tmsize_t cc, uint16 s) 398 { 399 tmsize_t rowlen = TIFFScanlineSize(tif); 400 401 if (rowlen == 0) 402 return 0; 403 404 assert(cc%rowlen == 0); 405 while (cc && (*tif->tif_decoderow)(tif, bp, rowlen, s)) { 406 bp += rowlen; 407 cc -= rowlen; 408 } 409 return (cc == 0); 410 } 411 412 /* 413 * Decode a tile of pixels. We break it into rows to 414 * maintain synchrony with the encode algorithm, which 415 * is row by row. 416 */ 417 static int 418 LogLuvDecodeTile(TIFF* tif, uint8* bp, tmsize_t cc, uint16 s) 419 { 420 tmsize_t rowlen = TIFFTileRowSize(tif); 421 422 if (rowlen == 0) 423 return 0; 424 425 assert(cc%rowlen == 0); 426 while (cc && (*tif->tif_decoderow)(tif, bp, rowlen, s)) { 427 bp += rowlen; 428 cc -= rowlen; 429 } 430 return (cc == 0); 431 } 432 433 /* 434 * Encode a row of 16-bit pixels. 435 */ 436 static int 437 LogL16Encode(TIFF* tif, uint8* bp, tmsize_t cc, uint16 s) 438 { 439 static const char module[] = "LogL16Encode"; 440 LogLuvState* sp = EncoderState(tif); 441 int shft; 442 tmsize_t i; 443 tmsize_t j; 444 tmsize_t npixels; 445 uint8* op; 446 int16* tp; 447 int16 b; 448 tmsize_t occ; 449 int rc=0, mask; 450 tmsize_t beg; 451 452 assert(s == 0); 453 assert(sp != NULL); 454 npixels = cc / sp->pixel_size; 455 456 if (sp->user_datafmt == SGILOGDATAFMT_16BIT) 457 tp = (int16*) bp; 458 else { 459 tp = (int16*) sp->tbuf; 460 if(sp->tbuflen < npixels) { 461 TIFFErrorExt(tif->tif_clientdata, module, 462 "Translation buffer too short"); 463 return (0); 464 } 465 (*sp->tfunc)(sp, bp, npixels); 466 } 467 /* compress each byte string */ 468 op = tif->tif_rawcp; 469 occ = tif->tif_rawdatasize - tif->tif_rawcc; 470 for (shft = 2*8; (shft -= 8) >= 0; ) 471 for (i = 0; i < npixels; i += rc) { 472 if (occ < 4) { 473 tif->tif_rawcp = op; 474 tif->tif_rawcc = tif->tif_rawdatasize - occ; 475 if (!TIFFFlushData1(tif)) 476 return (0); 477 op = tif->tif_rawcp; 478 occ = tif->tif_rawdatasize - tif->tif_rawcc; 479 } 480 mask = 0xff << shft; /* find next run */ 481 for (beg = i; beg < npixels; beg += rc) { 482 b = (int16) (tp[beg] & mask); 483 rc = 1; 484 while (rc < 127+2 && beg+rc < npixels && 485 (tp[beg+rc] & mask) == b) 486 rc++; 487 if (rc >= MINRUN) 488 break; /* long enough */ 489 } 490 if (beg-i > 1 && beg-i < MINRUN) { 491 b = (int16) (tp[i] & mask);/*check short run */ 492 j = i+1; 493 while ((tp[j++] & mask) == b) 494 if (j == beg) { 495 *op++ = (uint8)(128-2+j-i); 496 *op++ = (uint8)(b >> shft); 497 occ -= 2; 498 i = beg; 499 break; 500 } 501 } 502 while (i < beg) { /* write out non-run */ 503 if ((j = beg-i) > 127) j = 127; 504 if (occ < j+3) { 505 tif->tif_rawcp = op; 506 tif->tif_rawcc = tif->tif_rawdatasize - occ; 507 if (!TIFFFlushData1(tif)) 508 return (0); 509 op = tif->tif_rawcp; 510 occ = tif->tif_rawdatasize - tif->tif_rawcc; 511 } 512 *op++ = (uint8) j; occ--; 513 while (j--) { 514 *op++ = (uint8) (tp[i++] >> shft & 0xff); 515 occ--; 516 } 517 } 518 if (rc >= MINRUN) { /* write out run */ 519 *op++ = (uint8) (128-2+rc); 520 *op++ = (uint8) (tp[beg] >> shft & 0xff); 521 occ -= 2; 522 } else 523 rc = 0; 524 } 525 tif->tif_rawcp = op; 526 tif->tif_rawcc = tif->tif_rawdatasize - occ; 527 528 return (1); 529 } 530 531 /* 532 * Encode a row of 24-bit pixels. 533 */ 534 static int 535 LogLuvEncode24(TIFF* tif, uint8* bp, tmsize_t cc, uint16 s) 536 { 537 static const char module[] = "LogLuvEncode24"; 538 LogLuvState* sp = EncoderState(tif); 539 tmsize_t i; 540 tmsize_t npixels; 541 tmsize_t occ; 542 uint8* op; 543 uint32* tp; 544 545 assert(s == 0); 546 assert(sp != NULL); 547 npixels = cc / sp->pixel_size; 548 549 if (sp->user_datafmt == SGILOGDATAFMT_RAW) 550 tp = (uint32*) bp; 551 else { 552 tp = (uint32*) sp->tbuf; 553 if(sp->tbuflen < npixels) { 554 TIFFErrorExt(tif->tif_clientdata, module, 555 "Translation buffer too short"); 556 return (0); 557 } 558 (*sp->tfunc)(sp, bp, npixels); 559 } 560 /* write out encoded pixels */ 561 op = tif->tif_rawcp; 562 occ = tif->tif_rawdatasize - tif->tif_rawcc; 563 for (i = npixels; i--; ) { 564 if (occ < 3) { 565 tif->tif_rawcp = op; 566 tif->tif_rawcc = tif->tif_rawdatasize - occ; 567 if (!TIFFFlushData1(tif)) 568 return (0); 569 op = tif->tif_rawcp; 570 occ = tif->tif_rawdatasize - tif->tif_rawcc; 571 } 572 *op++ = (uint8)(*tp >> 16); 573 *op++ = (uint8)(*tp >> 8 & 0xff); 574 *op++ = (uint8)(*tp++ & 0xff); 575 occ -= 3; 576 } 577 tif->tif_rawcp = op; 578 tif->tif_rawcc = tif->tif_rawdatasize - occ; 579 580 return (1); 581 } 582 583 /* 584 * Encode a row of 32-bit pixels. 585 */ 586 static int 587 LogLuvEncode32(TIFF* tif, uint8* bp, tmsize_t cc, uint16 s) 588 { 589 static const char module[] = "LogLuvEncode32"; 590 LogLuvState* sp = EncoderState(tif); 591 int shft; 592 tmsize_t i; 593 tmsize_t j; 594 tmsize_t npixels; 595 uint8* op; 596 uint32* tp; 597 uint32 b; 598 tmsize_t occ; 599 int rc=0, mask; 600 tmsize_t beg; 601 602 assert(s == 0); 603 assert(sp != NULL); 604 605 npixels = cc / sp->pixel_size; 606 607 if (sp->user_datafmt == SGILOGDATAFMT_RAW) 608 tp = (uint32*) bp; 609 else { 610 tp = (uint32*) sp->tbuf; 611 if(sp->tbuflen < npixels) { 612 TIFFErrorExt(tif->tif_clientdata, module, 613 "Translation buffer too short"); 614 return (0); 615 } 616 (*sp->tfunc)(sp, bp, npixels); 617 } 618 /* compress each byte string */ 619 op = tif->tif_rawcp; 620 occ = tif->tif_rawdatasize - tif->tif_rawcc; 621 for (shft = 4*8; (shft -= 8) >= 0; ) 622 for (i = 0; i < npixels; i += rc) { 623 if (occ < 4) { 624 tif->tif_rawcp = op; 625 tif->tif_rawcc = tif->tif_rawdatasize - occ; 626 if (!TIFFFlushData1(tif)) 627 return (0); 628 op = tif->tif_rawcp; 629 occ = tif->tif_rawdatasize - tif->tif_rawcc; 630 } 631 mask = 0xff << shft; /* find next run */ 632 for (beg = i; beg < npixels; beg += rc) { 633 b = tp[beg] & mask; 634 rc = 1; 635 while (rc < 127+2 && beg+rc < npixels && 636 (tp[beg+rc] & mask) == b) 637 rc++; 638 if (rc >= MINRUN) 639 break; /* long enough */ 640 } 641 if (beg-i > 1 && beg-i < MINRUN) { 642 b = tp[i] & mask; /* check short run */ 643 j = i+1; 644 while ((tp[j++] & mask) == b) 645 if (j == beg) { 646 *op++ = (uint8)(128-2+j-i); 647 *op++ = (uint8)(b >> shft); 648 occ -= 2; 649 i = beg; 650 break; 651 } 652 } 653 while (i < beg) { /* write out non-run */ 654 if ((j = beg-i) > 127) j = 127; 655 if (occ < j+3) { 656 tif->tif_rawcp = op; 657 tif->tif_rawcc = tif->tif_rawdatasize - occ; 658 if (!TIFFFlushData1(tif)) 659 return (0); 660 op = tif->tif_rawcp; 661 occ = tif->tif_rawdatasize - tif->tif_rawcc; 662 } 663 *op++ = (uint8) j; occ--; 664 while (j--) { 665 *op++ = (uint8)(tp[i++] >> shft & 0xff); 666 occ--; 667 } 668 } 669 if (rc >= MINRUN) { /* write out run */ 670 *op++ = (uint8) (128-2+rc); 671 *op++ = (uint8)(tp[beg] >> shft & 0xff); 672 occ -= 2; 673 } else 674 rc = 0; 675 } 676 tif->tif_rawcp = op; 677 tif->tif_rawcc = tif->tif_rawdatasize - occ; 678 679 return (1); 680 } 681 682 /* 683 * Encode a strip of pixels. We break it into rows to 684 * avoid encoding runs across row boundaries. 685 */ 686 static int 687 LogLuvEncodeStrip(TIFF* tif, uint8* bp, tmsize_t cc, uint16 s) 688 { 689 tmsize_t rowlen = TIFFScanlineSize(tif); 690 691 if (rowlen == 0) 692 return 0; 693 694 assert(cc%rowlen == 0); 695 while (cc && (*tif->tif_encoderow)(tif, bp, rowlen, s) == 1) { 696 bp += rowlen; 697 cc -= rowlen; 698 } 699 return (cc == 0); 700 } 701 702 /* 703 * Encode a tile of pixels. We break it into rows to 704 * avoid encoding runs across row boundaries. 705 */ 706 static int 707 LogLuvEncodeTile(TIFF* tif, uint8* bp, tmsize_t cc, uint16 s) 708 { 709 tmsize_t rowlen = TIFFTileRowSize(tif); 710 711 if (rowlen == 0) 712 return 0; 713 714 assert(cc%rowlen == 0); 715 while (cc && (*tif->tif_encoderow)(tif, bp, rowlen, s) == 1) { 716 bp += rowlen; 717 cc -= rowlen; 718 } 719 return (cc == 0); 720 } 721 722 /* 723 * Encode/Decode functions for converting to and from user formats. 724 */ 725 726 #include "uvcode.h" 727 728 #ifndef UVSCALE 729 #define U_NEU 0.210526316 730 #define V_NEU 0.473684211 731 #define UVSCALE 410. 732 #endif 733 734 #ifndef M_LN2 735 #define M_LN2 0.69314718055994530942 736 #endif 737 #ifndef M_PI 738 #define M_PI 3.14159265358979323846 739 #endif 740 #undef log2 /* Conflict with C'99 function */ 741 #define log2(x) ((1./M_LN2)*log(x)) 742 #undef exp2 /* Conflict with C'99 function */ 743 #define exp2(x) exp(M_LN2*(x)) 744 745 #define itrunc(x,m) ((m)==SGILOGENCODE_NODITHER ? \ 746 (int)(x) : \ 747 (int)((x) + rand()*(1./RAND_MAX) - .5)) 748 749 #if !LOGLUV_PUBLIC 750 static 751 #endif 752 double 753 LogL16toY(int p16) /* compute luminance from 16-bit LogL */ 754 { 755 int Le = p16 & 0x7fff; 756 double Y; 757 758 if (!Le) 759 return (0.); 760 Y = exp(M_LN2/256.*(Le+.5) - M_LN2*64.); 761 return (!(p16 & 0x8000) ? Y : -Y); 762 } 763 764 #if !LOGLUV_PUBLIC 765 static 766 #endif 767 int 768 LogL16fromY(double Y, int em) /* get 16-bit LogL from Y */ 769 { 770 if (Y >= 1.8371976e19) 771 return (0x7fff); 772 if (Y <= -1.8371976e19) 773 return (0xffff); 774 if (Y > 5.4136769e-20) 775 return itrunc(256.*(log2(Y) + 64.), em); 776 if (Y < -5.4136769e-20) 777 return (~0x7fff | itrunc(256.*(log2(-Y) + 64.), em)); 778 return (0); 779 } 780 781 static void 782 L16toY(LogLuvState* sp, uint8* op, tmsize_t n) 783 { 784 int16* l16 = (int16*) sp->tbuf; 785 float* yp = (float*) op; 786 787 while (n-- > 0) 788 *yp++ = (float)LogL16toY(*l16++); 789 } 790 791 static void 792 L16toGry(LogLuvState* sp, uint8* op, tmsize_t n) 793 { 794 int16* l16 = (int16*) sp->tbuf; 795 uint8* gp = (uint8*) op; 796 797 while (n-- > 0) { 798 double Y = LogL16toY(*l16++); 799 *gp++ = (uint8) ((Y <= 0.) ? 0 : (Y >= 1.) ? 255 : (int)(256.*sqrt(Y))); 800 } 801 } 802 803 static void 804 L16fromY(LogLuvState* sp, uint8* op, tmsize_t n) 805 { 806 int16* l16 = (int16*) sp->tbuf; 807 float* yp = (float*) op; 808 809 while (n-- > 0) 810 *l16++ = (int16) (LogL16fromY(*yp++, sp->encode_meth)); 811 } 812 813 #if !LOGLUV_PUBLIC 814 static 815 #endif 816 void 817 XYZtoRGB24(float xyz[3], uint8 rgb[3]) 818 { 819 double r, g, b; 820 /* assume CCIR-709 primaries */ 821 r = 2.690*xyz[0] + -1.276*xyz[1] + -0.414*xyz[2]; 822 g = -1.022*xyz[0] + 1.978*xyz[1] + 0.044*xyz[2]; 823 b = 0.061*xyz[0] + -0.224*xyz[1] + 1.163*xyz[2]; 824 /* assume 2.0 gamma for speed */ 825 /* could use integer sqrt approx., but this is probably faster */ 826 rgb[0] = (uint8)((r<=0.) ? 0 : (r >= 1.) ? 255 : (int)(256.*sqrt(r))); 827 rgb[1] = (uint8)((g<=0.) ? 0 : (g >= 1.) ? 255 : (int)(256.*sqrt(g))); 828 rgb[2] = (uint8)((b<=0.) ? 0 : (b >= 1.) ? 255 : (int)(256.*sqrt(b))); 829 } 830 831 #if !LOGLUV_PUBLIC 832 static 833 #endif 834 double 835 LogL10toY(int p10) /* compute luminance from 10-bit LogL */ 836 { 837 if (p10 == 0) 838 return (0.); 839 return (exp(M_LN2/64.*(p10+.5) - M_LN2*12.)); 840 } 841 842 #if !LOGLUV_PUBLIC 843 static 844 #endif 845 int 846 LogL10fromY(double Y, int em) /* get 10-bit LogL from Y */ 847 { 848 if (Y >= 15.742) 849 return (0x3ff); 850 else if (Y <= .00024283) 851 return (0); 852 else 853 return itrunc(64.*(log2(Y) + 12.), em); 854 } 855 856 #define NANGLES 100 857 #define uv2ang(u, v) ( (NANGLES*.499999999/M_PI) \ 858 * atan2((v)-V_NEU,(u)-U_NEU) + .5*NANGLES ) 859 860 static int 861 oog_encode(double u, double v) /* encode out-of-gamut chroma */ 862 { 863 static int oog_table[NANGLES]; 864 static int initialized = 0; 865 register int i; 866 867 if (!initialized) { /* set up perimeter table */ 868 double eps[NANGLES], ua, va, ang, epsa; 869 int ui, vi, ustep; 870 for (i = NANGLES; i--; ) 871 eps[i] = 2.; 872 for (vi = UV_NVS; vi--; ) { 873 va = UV_VSTART + (vi+.5)*UV_SQSIZ; 874 ustep = uv_row[vi].nus-1; 875 if (vi == UV_NVS-1 || vi == 0 || ustep <= 0) 876 ustep = 1; 877 for (ui = uv_row[vi].nus-1; ui >= 0; ui -= ustep) { 878 ua = uv_row[vi].ustart + (ui+.5)*UV_SQSIZ; 879 ang = uv2ang(ua, va); 880 i = (int) ang; 881 epsa = fabs(ang - (i+.5)); 882 if (epsa < eps[i]) { 883 oog_table[i] = uv_row[vi].ncum + ui; 884 eps[i] = epsa; 885 } 886 } 887 } 888 for (i = NANGLES; i--; ) /* fill any holes */ 889 if (eps[i] > 1.5) { 890 int i1, i2; 891 for (i1 = 1; i1 < NANGLES/2; i1++) 892 if (eps[(i+i1)%NANGLES] < 1.5) 893 break; 894 for (i2 = 1; i2 < NANGLES/2; i2++) 895 if (eps[(i+NANGLES-i2)%NANGLES] < 1.5) 896 break; 897 if (i1 < i2) 898 oog_table[i] = 899 oog_table[(i+i1)%NANGLES]; 900 else 901 oog_table[i] = 902 oog_table[(i+NANGLES-i2)%NANGLES]; 903 } 904 initialized = 1; 905 } 906 i = (int) uv2ang(u, v); /* look up hue angle */ 907 return (oog_table[i]); 908 } 909 910 #undef uv2ang 911 #undef NANGLES 912 913 #if !LOGLUV_PUBLIC 914 static 915 #endif 916 int 917 uv_encode(double u, double v, int em) /* encode (u',v') coordinates */ 918 { 919 register int vi, ui; 920 921 if (v < UV_VSTART) 922 return oog_encode(u, v); 923 vi = itrunc((v - UV_VSTART)*(1./UV_SQSIZ), em); 924 if (vi >= UV_NVS) 925 return oog_encode(u, v); 926 if (u < uv_row[vi].ustart) 927 return oog_encode(u, v); 928 ui = itrunc((u - uv_row[vi].ustart)*(1./UV_SQSIZ), em); 929 if (ui >= uv_row[vi].nus) 930 return oog_encode(u, v); 931 932 return (uv_row[vi].ncum + ui); 933 } 934 935 #if !LOGLUV_PUBLIC 936 static 937 #endif 938 int 939 uv_decode(double *up, double *vp, int c) /* decode (u',v') index */ 940 { 941 int upper, lower; 942 register int ui, vi; 943 944 if (c < 0 || c >= UV_NDIVS) 945 return (-1); 946 lower = 0; /* binary search */ 947 upper = UV_NVS; 948 while (upper - lower > 1) { 949 vi = (lower + upper) >> 1; 950 ui = c - uv_row[vi].ncum; 951 if (ui > 0) 952 lower = vi; 953 else if (ui < 0) 954 upper = vi; 955 else { 956 lower = vi; 957 break; 958 } 959 } 960 vi = lower; 961 ui = c - uv_row[vi].ncum; 962 *up = uv_row[vi].ustart + (ui+.5)*UV_SQSIZ; 963 *vp = UV_VSTART + (vi+.5)*UV_SQSIZ; 964 return (0); 965 } 966 967 #if !LOGLUV_PUBLIC 968 static 969 #endif 970 void 971 LogLuv24toXYZ(uint32 p, float XYZ[3]) 972 { 973 int Ce; 974 double L, u, v, s, x, y; 975 /* decode luminance */ 976 L = LogL10toY(p>>14 & 0x3ff); 977 if (L <= 0.) { 978 XYZ[0] = XYZ[1] = XYZ[2] = 0.; 979 return; 980 } 981 /* decode color */ 982 Ce = p & 0x3fff; 983 if (uv_decode(&u, &v, Ce) < 0) { 984 u = U_NEU; v = V_NEU; 985 } 986 s = 1./(6.*u - 16.*v + 12.); 987 x = 9.*u * s; 988 y = 4.*v * s; 989 /* convert to XYZ */ 990 XYZ[0] = (float)(x/y * L); 991 XYZ[1] = (float)L; 992 XYZ[2] = (float)((1.-x-y)/y * L); 993 } 994 995 #if !LOGLUV_PUBLIC 996 static 997 #endif 998 uint32 999 LogLuv24fromXYZ(float XYZ[3], int em) 1000 { 1001 int Le, Ce; 1002 double u, v, s; 1003 /* encode luminance */ 1004 Le = LogL10fromY(XYZ[1], em); 1005 /* encode color */ 1006 s = XYZ[0] + 15.*XYZ[1] + 3.*XYZ[2]; 1007 if (!Le || s <= 0.) { 1008 u = U_NEU; 1009 v = V_NEU; 1010 } else { 1011 u = 4.*XYZ[0] / s; 1012 v = 9.*XYZ[1] / s; 1013 } 1014 Ce = uv_encode(u, v, em); 1015 if (Ce < 0) /* never happens */ 1016 Ce = uv_encode(U_NEU, V_NEU, SGILOGENCODE_NODITHER); 1017 /* combine encodings */ 1018 return (Le << 14 | Ce); 1019 } 1020 1021 static void 1022 Luv24toXYZ(LogLuvState* sp, uint8* op, tmsize_t n) 1023 { 1024 uint32* luv = (uint32*) sp->tbuf; 1025 float* xyz = (float*) op; 1026 1027 while (n-- > 0) { 1028 LogLuv24toXYZ(*luv, xyz); 1029 xyz += 3; 1030 luv++; 1031 } 1032 } 1033 1034 static void 1035 Luv24toLuv48(LogLuvState* sp, uint8* op, tmsize_t n) 1036 { 1037 uint32* luv = (uint32*) sp->tbuf; 1038 int16* luv3 = (int16*) op; 1039 1040 while (n-- > 0) { 1041 double u, v; 1042 1043 *luv3++ = (int16)((*luv >> 12 & 0xffd) + 13314); 1044 if (uv_decode(&u, &v, *luv&0x3fff) < 0) { 1045 u = U_NEU; 1046 v = V_NEU; 1047 } 1048 *luv3++ = (int16)(u * (1L<<15)); 1049 *luv3++ = (int16)(v * (1L<<15)); 1050 luv++; 1051 } 1052 } 1053 1054 static void 1055 Luv24toRGB(LogLuvState* sp, uint8* op, tmsize_t n) 1056 { 1057 uint32* luv = (uint32*) sp->tbuf; 1058 uint8* rgb = (uint8*) op; 1059 1060 while (n-- > 0) { 1061 float xyz[3]; 1062 1063 LogLuv24toXYZ(*luv++, xyz); 1064 XYZtoRGB24(xyz, rgb); 1065 rgb += 3; 1066 } 1067 } 1068 1069 static void 1070 Luv24fromXYZ(LogLuvState* sp, uint8* op, tmsize_t n) 1071 { 1072 uint32* luv = (uint32*) sp->tbuf; 1073 float* xyz = (float*) op; 1074 1075 while (n-- > 0) { 1076 *luv++ = LogLuv24fromXYZ(xyz, sp->encode_meth); 1077 xyz += 3; 1078 } 1079 } 1080 1081 static void 1082 Luv24fromLuv48(LogLuvState* sp, uint8* op, tmsize_t n) 1083 { 1084 uint32* luv = (uint32*) sp->tbuf; 1085 int16* luv3 = (int16*) op; 1086 1087 while (n-- > 0) { 1088 int Le, Ce; 1089 1090 if (luv3[0] <= 0) 1091 Le = 0; 1092 else if (luv3[0] >= (1<<12)+3314) 1093 Le = (1<<10) - 1; 1094 else if (sp->encode_meth == SGILOGENCODE_NODITHER) 1095 Le = (luv3[0]-3314) >> 2; 1096 else 1097 Le = itrunc(.25*(luv3[0]-3314.), sp->encode_meth); 1098 1099 Ce = uv_encode((luv3[1]+.5)/(1<<15), (luv3[2]+.5)/(1<<15), 1100 sp->encode_meth); 1101 if (Ce < 0) /* never happens */ 1102 Ce = uv_encode(U_NEU, V_NEU, SGILOGENCODE_NODITHER); 1103 *luv++ = (uint32)Le << 14 | Ce; 1104 luv3 += 3; 1105 } 1106 } 1107 1108 #if !LOGLUV_PUBLIC 1109 static 1110 #endif 1111 void 1112 LogLuv32toXYZ(uint32 p, float XYZ[3]) 1113 { 1114 double L, u, v, s, x, y; 1115 /* decode luminance */ 1116 L = LogL16toY((int)p >> 16); 1117 if (L <= 0.) { 1118 XYZ[0] = XYZ[1] = XYZ[2] = 0.; 1119 return; 1120 } 1121 /* decode color */ 1122 u = 1./UVSCALE * ((p>>8 & 0xff) + .5); 1123 v = 1./UVSCALE * ((p & 0xff) + .5); 1124 s = 1./(6.*u - 16.*v + 12.); 1125 x = 9.*u * s; 1126 y = 4.*v * s; 1127 /* convert to XYZ */ 1128 XYZ[0] = (float)(x/y * L); 1129 XYZ[1] = (float)L; 1130 XYZ[2] = (float)((1.-x-y)/y * L); 1131 } 1132 1133 #if !LOGLUV_PUBLIC 1134 static 1135 #endif 1136 uint32 1137 LogLuv32fromXYZ(float XYZ[3], int em) 1138 { 1139 unsigned int Le, ue, ve; 1140 double u, v, s; 1141 /* encode luminance */ 1142 Le = (unsigned int)LogL16fromY(XYZ[1], em); 1143 /* encode color */ 1144 s = XYZ[0] + 15.*XYZ[1] + 3.*XYZ[2]; 1145 if (!Le || s <= 0.) { 1146 u = U_NEU; 1147 v = V_NEU; 1148 } else { 1149 u = 4.*XYZ[0] / s; 1150 v = 9.*XYZ[1] / s; 1151 } 1152 if (u <= 0.) ue = 0; 1153 else ue = itrunc(UVSCALE*u, em); 1154 if (ue > 255) ue = 255; 1155 if (v <= 0.) ve = 0; 1156 else ve = itrunc(UVSCALE*v, em); 1157 if (ve > 255) ve = 255; 1158 /* combine encodings */ 1159 return (Le << 16 | ue << 8 | ve); 1160 } 1161 1162 static void 1163 Luv32toXYZ(LogLuvState* sp, uint8* op, tmsize_t n) 1164 { 1165 uint32* luv = (uint32*) sp->tbuf; 1166 float* xyz = (float*) op; 1167 1168 while (n-- > 0) { 1169 LogLuv32toXYZ(*luv++, xyz); 1170 xyz += 3; 1171 } 1172 } 1173 1174 static void 1175 Luv32toLuv48(LogLuvState* sp, uint8* op, tmsize_t n) 1176 { 1177 uint32* luv = (uint32*) sp->tbuf; 1178 int16* luv3 = (int16*) op; 1179 1180 while (n-- > 0) { 1181 double u, v; 1182 1183 *luv3++ = (int16)(*luv >> 16); 1184 u = 1./UVSCALE * ((*luv>>8 & 0xff) + .5); 1185 v = 1./UVSCALE * ((*luv & 0xff) + .5); 1186 *luv3++ = (int16)(u * (1L<<15)); 1187 *luv3++ = (int16)(v * (1L<<15)); 1188 luv++; 1189 } 1190 } 1191 1192 static void 1193 Luv32toRGB(LogLuvState* sp, uint8* op, tmsize_t n) 1194 { 1195 uint32* luv = (uint32*) sp->tbuf; 1196 uint8* rgb = (uint8*) op; 1197 1198 while (n-- > 0) { 1199 float xyz[3]; 1200 1201 LogLuv32toXYZ(*luv++, xyz); 1202 XYZtoRGB24(xyz, rgb); 1203 rgb += 3; 1204 } 1205 } 1206 1207 static void 1208 Luv32fromXYZ(LogLuvState* sp, uint8* op, tmsize_t n) 1209 { 1210 uint32* luv = (uint32*) sp->tbuf; 1211 float* xyz = (float*) op; 1212 1213 while (n-- > 0) { 1214 *luv++ = LogLuv32fromXYZ(xyz, sp->encode_meth); 1215 xyz += 3; 1216 } 1217 } 1218 1219 static void 1220 Luv32fromLuv48(LogLuvState* sp, uint8* op, tmsize_t n) 1221 { 1222 uint32* luv = (uint32*) sp->tbuf; 1223 int16* luv3 = (int16*) op; 1224 1225 if (sp->encode_meth == SGILOGENCODE_NODITHER) { 1226 while (n-- > 0) { 1227 *luv++ = (uint32)luv3[0] << 16 | 1228 (luv3[1]*(uint32)(UVSCALE+.5) >> 7 & 0xff00) | 1229 (luv3[2]*(uint32)(UVSCALE+.5) >> 15 & 0xff); 1230 luv3 += 3; 1231 } 1232 return; 1233 } 1234 while (n-- > 0) { 1235 *luv++ = (uint32)luv3[0] << 16 | 1236 (itrunc(luv3[1]*(UVSCALE/(1<<15)), sp->encode_meth) << 8 & 0xff00) | 1237 (itrunc(luv3[2]*(UVSCALE/(1<<15)), sp->encode_meth) & 0xff); 1238 luv3 += 3; 1239 } 1240 } 1241 1242 static void 1243 _logLuvNop(LogLuvState* sp, uint8* op, tmsize_t n) 1244 { 1245 (void) sp; (void) op; (void) n; 1246 } 1247 1248 static int 1249 LogL16GuessDataFmt(TIFFDirectory *td) 1250 { 1251 #define PACK(s,b,f) (((b)<<6)|((s)<<3)|(f)) 1252 switch (PACK(td->td_samplesperpixel, td->td_bitspersample, td->td_sampleformat)) { 1253 case PACK(1, 32, SAMPLEFORMAT_IEEEFP): 1254 return (SGILOGDATAFMT_FLOAT); 1255 case PACK(1, 16, SAMPLEFORMAT_VOID): 1256 case PACK(1, 16, SAMPLEFORMAT_INT): 1257 case PACK(1, 16, SAMPLEFORMAT_UINT): 1258 return (SGILOGDATAFMT_16BIT); 1259 case PACK(1, 8, SAMPLEFORMAT_VOID): 1260 case PACK(1, 8, SAMPLEFORMAT_UINT): 1261 return (SGILOGDATAFMT_8BIT); 1262 } 1263 #undef PACK 1264 return (SGILOGDATAFMT_UNKNOWN); 1265 } 1266 1267 1268 #define TIFF_SIZE_T_MAX ((size_t) ~ ((size_t)0)) 1269 #define TIFF_TMSIZE_T_MAX (tmsize_t)(TIFF_SIZE_T_MAX >> 1) 1270 1271 static tmsize_t 1272 multiply_ms(tmsize_t m1, tmsize_t m2) 1273 { 1274 if( m1 == 0 || m2 > TIFF_TMSIZE_T_MAX / m1 ) 1275 return 0; 1276 return m1 * m2; 1277 } 1278 1279 static int 1280 LogL16InitState(TIFF* tif) 1281 { 1282 static const char module[] = "LogL16InitState"; 1283 TIFFDirectory *td = &tif->tif_dir; 1284 LogLuvState* sp = DecoderState(tif); 1285 1286 assert(sp != NULL); 1287 assert(td->td_photometric == PHOTOMETRIC_LOGL); 1288 1289 if( td->td_samplesperpixel != 1 ) 1290 { 1291 TIFFErrorExt(tif->tif_clientdata, module, 1292 "Sorry, can not handle LogL image with %s=%d", 1293 "Samples/pixel", td->td_samplesperpixel); 1294 return 0; 1295 } 1296 1297 /* for some reason, we can't do this in TIFFInitLogL16 */ 1298 if (sp->user_datafmt == SGILOGDATAFMT_UNKNOWN) 1299 sp->user_datafmt = LogL16GuessDataFmt(td); 1300 switch (sp->user_datafmt) { 1301 case SGILOGDATAFMT_FLOAT: 1302 sp->pixel_size = sizeof (float); 1303 break; 1304 case SGILOGDATAFMT_16BIT: 1305 sp->pixel_size = sizeof (int16); 1306 break; 1307 case SGILOGDATAFMT_8BIT: 1308 sp->pixel_size = sizeof (uint8); 1309 break; 1310 default: 1311 TIFFErrorExt(tif->tif_clientdata, module, 1312 "No support for converting user data format to LogL"); 1313 return (0); 1314 } 1315 if( isTiled(tif) ) 1316 sp->tbuflen = multiply_ms(td->td_tilewidth, td->td_tilelength); 1317 else if( td->td_rowsperstrip != (uint32)-1 ) 1318 sp->tbuflen = multiply_ms(td->td_imagewidth, td->td_rowsperstrip); 1319 else 1320 sp->tbuflen = multiply_ms(td->td_imagewidth, td->td_imagelength); 1321 if (multiply_ms(sp->tbuflen, sizeof (int16)) == 0 || 1322 (sp->tbuf = (uint8*) _TIFFmalloc(sp->tbuflen * sizeof (int16))) == NULL) { 1323 TIFFErrorExt(tif->tif_clientdata, module, "No space for SGILog translation buffer"); 1324 return (0); 1325 } 1326 return (1); 1327 } 1328 1329 static int 1330 LogLuvGuessDataFmt(TIFFDirectory *td) 1331 { 1332 int guess; 1333 1334 /* 1335 * If the user didn't tell us their datafmt, 1336 * take our best guess from the bitspersample. 1337 */ 1338 #define PACK(a,b) (((a)<<3)|(b)) 1339 switch (PACK(td->td_bitspersample, td->td_sampleformat)) { 1340 case PACK(32, SAMPLEFORMAT_IEEEFP): 1341 guess = SGILOGDATAFMT_FLOAT; 1342 break; 1343 case PACK(32, SAMPLEFORMAT_VOID): 1344 case PACK(32, SAMPLEFORMAT_UINT): 1345 case PACK(32, SAMPLEFORMAT_INT): 1346 guess = SGILOGDATAFMT_RAW; 1347 break; 1348 case PACK(16, SAMPLEFORMAT_VOID): 1349 case PACK(16, SAMPLEFORMAT_INT): 1350 case PACK(16, SAMPLEFORMAT_UINT): 1351 guess = SGILOGDATAFMT_16BIT; 1352 break; 1353 case PACK( 8, SAMPLEFORMAT_VOID): 1354 case PACK( 8, SAMPLEFORMAT_UINT): 1355 guess = SGILOGDATAFMT_8BIT; 1356 break; 1357 default: 1358 guess = SGILOGDATAFMT_UNKNOWN; 1359 break; 1360 #undef PACK 1361 } 1362 /* 1363 * Double-check samples per pixel. 1364 */ 1365 switch (td->td_samplesperpixel) { 1366 case 1: 1367 if (guess != SGILOGDATAFMT_RAW) 1368 guess = SGILOGDATAFMT_UNKNOWN; 1369 break; 1370 case 3: 1371 if (guess == SGILOGDATAFMT_RAW) 1372 guess = SGILOGDATAFMT_UNKNOWN; 1373 break; 1374 default: 1375 guess = SGILOGDATAFMT_UNKNOWN; 1376 break; 1377 } 1378 return (guess); 1379 } 1380 1381 static int 1382 LogLuvInitState(TIFF* tif) 1383 { 1384 static const char module[] = "LogLuvInitState"; 1385 TIFFDirectory* td = &tif->tif_dir; 1386 LogLuvState* sp = DecoderState(tif); 1387 1388 assert(sp != NULL); 1389 assert(td->td_photometric == PHOTOMETRIC_LOGLUV); 1390 1391 /* for some reason, we can't do this in TIFFInitLogLuv */ 1392 if (td->td_planarconfig != PLANARCONFIG_CONTIG) { 1393 TIFFErrorExt(tif->tif_clientdata, module, 1394 "SGILog compression cannot handle non-contiguous data"); 1395 return (0); 1396 } 1397 if (sp->user_datafmt == SGILOGDATAFMT_UNKNOWN) 1398 sp->user_datafmt = LogLuvGuessDataFmt(td); 1399 switch (sp->user_datafmt) { 1400 case SGILOGDATAFMT_FLOAT: 1401 sp->pixel_size = 3*sizeof (float); 1402 break; 1403 case SGILOGDATAFMT_16BIT: 1404 sp->pixel_size = 3*sizeof (int16); 1405 break; 1406 case SGILOGDATAFMT_RAW: 1407 sp->pixel_size = sizeof (uint32); 1408 break; 1409 case SGILOGDATAFMT_8BIT: 1410 sp->pixel_size = 3*sizeof (uint8); 1411 break; 1412 default: 1413 TIFFErrorExt(tif->tif_clientdata, module, 1414 "No support for converting user data format to LogLuv"); 1415 return (0); 1416 } 1417 if( isTiled(tif) ) 1418 sp->tbuflen = multiply_ms(td->td_tilewidth, td->td_tilelength); 1419 else 1420 sp->tbuflen = multiply_ms(td->td_imagewidth, td->td_rowsperstrip); 1421 if (multiply_ms(sp->tbuflen, sizeof (uint32)) == 0 || 1422 (sp->tbuf = (uint8*) _TIFFmalloc(sp->tbuflen * sizeof (uint32))) == NULL) { 1423 TIFFErrorExt(tif->tif_clientdata, module, "No space for SGILog translation buffer"); 1424 return (0); 1425 } 1426 return (1); 1427 } 1428 1429 static int 1430 LogLuvFixupTags(TIFF* tif) 1431 { 1432 (void) tif; 1433 return (1); 1434 } 1435 1436 static int 1437 LogLuvSetupDecode(TIFF* tif) 1438 { 1439 static const char module[] = "LogLuvSetupDecode"; 1440 LogLuvState* sp = DecoderState(tif); 1441 TIFFDirectory* td = &tif->tif_dir; 1442 1443 tif->tif_postdecode = _TIFFNoPostDecode; 1444 switch (td->td_photometric) { 1445 case PHOTOMETRIC_LOGLUV: 1446 if (!LogLuvInitState(tif)) 1447 break; 1448 if (td->td_compression == COMPRESSION_SGILOG24) { 1449 tif->tif_decoderow = LogLuvDecode24; 1450 switch (sp->user_datafmt) { 1451 case SGILOGDATAFMT_FLOAT: 1452 sp->tfunc = Luv24toXYZ; 1453 break; 1454 case SGILOGDATAFMT_16BIT: 1455 sp->tfunc = Luv24toLuv48; 1456 break; 1457 case SGILOGDATAFMT_8BIT: 1458 sp->tfunc = Luv24toRGB; 1459 break; 1460 } 1461 } else { 1462 tif->tif_decoderow = LogLuvDecode32; 1463 switch (sp->user_datafmt) { 1464 case SGILOGDATAFMT_FLOAT: 1465 sp->tfunc = Luv32toXYZ; 1466 break; 1467 case SGILOGDATAFMT_16BIT: 1468 sp->tfunc = Luv32toLuv48; 1469 break; 1470 case SGILOGDATAFMT_8BIT: 1471 sp->tfunc = Luv32toRGB; 1472 break; 1473 } 1474 } 1475 return (1); 1476 case PHOTOMETRIC_LOGL: 1477 if (!LogL16InitState(tif)) 1478 break; 1479 tif->tif_decoderow = LogL16Decode; 1480 switch (sp->user_datafmt) { 1481 case SGILOGDATAFMT_FLOAT: 1482 sp->tfunc = L16toY; 1483 break; 1484 case SGILOGDATAFMT_8BIT: 1485 sp->tfunc = L16toGry; 1486 break; 1487 } 1488 return (1); 1489 default: 1490 TIFFErrorExt(tif->tif_clientdata, module, 1491 "Inappropriate photometric interpretation %d for SGILog compression; %s", 1492 td->td_photometric, "must be either LogLUV or LogL"); 1493 break; 1494 } 1495 return (0); 1496 } 1497 1498 static int 1499 LogLuvSetupEncode(TIFF* tif) 1500 { 1501 static const char module[] = "LogLuvSetupEncode"; 1502 LogLuvState* sp = EncoderState(tif); 1503 TIFFDirectory* td = &tif->tif_dir; 1504 1505 switch (td->td_photometric) { 1506 case PHOTOMETRIC_LOGLUV: 1507 if (!LogLuvInitState(tif)) 1508 break; 1509 if (td->td_compression == COMPRESSION_SGILOG24) { 1510 tif->tif_encoderow = LogLuvEncode24; 1511 switch (sp->user_datafmt) { 1512 case SGILOGDATAFMT_FLOAT: 1513 sp->tfunc = Luv24fromXYZ; 1514 break; 1515 case SGILOGDATAFMT_16BIT: 1516 sp->tfunc = Luv24fromLuv48; 1517 break; 1518 case SGILOGDATAFMT_RAW: 1519 break; 1520 default: 1521 goto notsupported; 1522 } 1523 } else { 1524 tif->tif_encoderow = LogLuvEncode32; 1525 switch (sp->user_datafmt) { 1526 case SGILOGDATAFMT_FLOAT: 1527 sp->tfunc = Luv32fromXYZ; 1528 break; 1529 case SGILOGDATAFMT_16BIT: 1530 sp->tfunc = Luv32fromLuv48; 1531 break; 1532 case SGILOGDATAFMT_RAW: 1533 break; 1534 default: 1535 goto notsupported; 1536 } 1537 } 1538 break; 1539 case PHOTOMETRIC_LOGL: 1540 if (!LogL16InitState(tif)) 1541 break; 1542 tif->tif_encoderow = LogL16Encode; 1543 switch (sp->user_datafmt) { 1544 case SGILOGDATAFMT_FLOAT: 1545 sp->tfunc = L16fromY; 1546 break; 1547 case SGILOGDATAFMT_16BIT: 1548 break; 1549 default: 1550 goto notsupported; 1551 } 1552 break; 1553 default: 1554 TIFFErrorExt(tif->tif_clientdata, module, 1555 "Inappropriate photometric interpretation %d for SGILog compression; %s", 1556 td->td_photometric, "must be either LogLUV or LogL"); 1557 break; 1558 } 1559 sp->encoder_state = 1; 1560 return (1); 1561 notsupported: 1562 TIFFErrorExt(tif->tif_clientdata, module, 1563 "SGILog compression supported only for %s, or raw data", 1564 td->td_photometric == PHOTOMETRIC_LOGL ? "Y, L" : "XYZ, Luv"); 1565 return (0); 1566 } 1567 1568 static void 1569 LogLuvClose(TIFF* tif) 1570 { 1571 LogLuvState* sp = (LogLuvState*) tif->tif_data; 1572 TIFFDirectory *td = &tif->tif_dir; 1573 1574 assert(sp != 0); 1575 /* 1576 * For consistency, we always want to write out the same 1577 * bitspersample and sampleformat for our TIFF file, 1578 * regardless of the data format being used by the application. 1579 * Since this routine is called after tags have been set but 1580 * before they have been recorded in the file, we reset them here. 1581 * Note: this is really a nasty approach. See PixarLogClose 1582 */ 1583 if( sp->encoder_state ) 1584 { 1585 /* See PixarLogClose. Might avoid issues with tags whose size depends 1586 * on those below, but not completely sure this is enough. */ 1587 td->td_samplesperpixel = 1588 (td->td_photometric == PHOTOMETRIC_LOGL) ? 1 : 3; 1589 td->td_bitspersample = 16; 1590 td->td_sampleformat = SAMPLEFORMAT_INT; 1591 } 1592 } 1593 1594 static void 1595 LogLuvCleanup(TIFF* tif) 1596 { 1597 LogLuvState* sp = (LogLuvState *)tif->tif_data; 1598 1599 assert(sp != 0); 1600 1601 tif->tif_tagmethods.vgetfield = sp->vgetparent; 1602 tif->tif_tagmethods.vsetfield = sp->vsetparent; 1603 1604 if (sp->tbuf) 1605 _TIFFfree(sp->tbuf); 1606 _TIFFfree(sp); 1607 tif->tif_data = NULL; 1608 1609 _TIFFSetDefaultCompressionState(tif); 1610 } 1611 1612 static int 1613 LogLuvVSetField(TIFF* tif, uint32 tag, va_list ap) 1614 { 1615 static const char module[] = "LogLuvVSetField"; 1616 LogLuvState* sp = DecoderState(tif); 1617 int bps, fmt; 1618 1619 switch (tag) { 1620 case TIFFTAG_SGILOGDATAFMT: 1621 sp->user_datafmt = (int) va_arg(ap, int); 1622 /* 1623 * Tweak the TIFF header so that the rest of libtiff knows what 1624 * size of data will be passed between app and library, and 1625 * assume that the app knows what it is doing and is not 1626 * confused by these header manipulations... 1627 */ 1628 switch (sp->user_datafmt) { 1629 case SGILOGDATAFMT_FLOAT: 1630 bps = 32; 1631 fmt = SAMPLEFORMAT_IEEEFP; 1632 break; 1633 case SGILOGDATAFMT_16BIT: 1634 bps = 16; 1635 fmt = SAMPLEFORMAT_INT; 1636 break; 1637 case SGILOGDATAFMT_RAW: 1638 bps = 32; 1639 fmt = SAMPLEFORMAT_UINT; 1640 TIFFSetField(tif, TIFFTAG_SAMPLESPERPIXEL, 1); 1641 break; 1642 case SGILOGDATAFMT_8BIT: 1643 bps = 8; 1644 fmt = SAMPLEFORMAT_UINT; 1645 break; 1646 default: 1647 TIFFErrorExt(tif->tif_clientdata, tif->tif_name, 1648 "Unknown data format %d for LogLuv compression", 1649 sp->user_datafmt); 1650 return (0); 1651 } 1652 TIFFSetField(tif, TIFFTAG_BITSPERSAMPLE, bps); 1653 TIFFSetField(tif, TIFFTAG_SAMPLEFORMAT, fmt); 1654 /* 1655 * Must recalculate sizes should bits/sample change. 1656 */ 1657 tif->tif_tilesize = isTiled(tif) ? TIFFTileSize(tif) : (tmsize_t) -1; 1658 tif->tif_scanlinesize = TIFFScanlineSize(tif); 1659 return (1); 1660 case TIFFTAG_SGILOGENCODE: 1661 sp->encode_meth = (int) va_arg(ap, int); 1662 if (sp->encode_meth != SGILOGENCODE_NODITHER && 1663 sp->encode_meth != SGILOGENCODE_RANDITHER) { 1664 TIFFErrorExt(tif->tif_clientdata, module, 1665 "Unknown encoding %d for LogLuv compression", 1666 sp->encode_meth); 1667 return (0); 1668 } 1669 return (1); 1670 default: 1671 return (*sp->vsetparent)(tif, tag, ap); 1672 } 1673 } 1674 1675 static int 1676 LogLuvVGetField(TIFF* tif, uint32 tag, va_list ap) 1677 { 1678 LogLuvState *sp = (LogLuvState *)tif->tif_data; 1679 1680 switch (tag) { 1681 case TIFFTAG_SGILOGDATAFMT: 1682 *va_arg(ap, int*) = sp->user_datafmt; 1683 return (1); 1684 default: 1685 return (*sp->vgetparent)(tif, tag, ap); 1686 } 1687 } 1688 1689 static const TIFFField LogLuvFields[] = { 1690 { TIFFTAG_SGILOGDATAFMT, 0, 0, TIFF_SHORT, 0, TIFF_SETGET_INT, TIFF_SETGET_UNDEFINED, FIELD_PSEUDO, TRUE, FALSE, "SGILogDataFmt", NULL}, 1691 { TIFFTAG_SGILOGENCODE, 0, 0, TIFF_SHORT, 0, TIFF_SETGET_INT, TIFF_SETGET_UNDEFINED, FIELD_PSEUDO, TRUE, FALSE, "SGILogEncode", NULL} 1692 }; 1693 1694 int 1695 TIFFInitSGILog(TIFF* tif, int scheme) 1696 { 1697 static const char module[] = "TIFFInitSGILog"; 1698 LogLuvState* sp; 1699 1700 assert(scheme == COMPRESSION_SGILOG24 || scheme == COMPRESSION_SGILOG); 1701 1702 /* 1703 * Merge codec-specific tag information. 1704 */ 1705 if (!_TIFFMergeFields(tif, LogLuvFields, 1706 TIFFArrayCount(LogLuvFields))) { 1707 TIFFErrorExt(tif->tif_clientdata, module, 1708 "Merging SGILog codec-specific tags failed"); 1709 return 0; 1710 } 1711 1712 /* 1713 * Allocate state block so tag methods have storage to record values. 1714 */ 1715 tif->tif_data = (uint8*) _TIFFmalloc(sizeof (LogLuvState)); 1716 if (tif->tif_data == NULL) 1717 goto bad; 1718 sp = (LogLuvState*) tif->tif_data; 1719 _TIFFmemset((void*)sp, 0, sizeof (*sp)); 1720 sp->user_datafmt = SGILOGDATAFMT_UNKNOWN; 1721 sp->encode_meth = (scheme == COMPRESSION_SGILOG24) ? 1722 SGILOGENCODE_RANDITHER : SGILOGENCODE_NODITHER; 1723 sp->tfunc = _logLuvNop; 1724 1725 /* 1726 * Install codec methods. 1727 * NB: tif_decoderow & tif_encoderow are filled 1728 * in at setup time. 1729 */ 1730 tif->tif_fixuptags = LogLuvFixupTags; 1731 tif->tif_setupdecode = LogLuvSetupDecode; 1732 tif->tif_decodestrip = LogLuvDecodeStrip; 1733 tif->tif_decodetile = LogLuvDecodeTile; 1734 tif->tif_setupencode = LogLuvSetupEncode; 1735 tif->tif_encodestrip = LogLuvEncodeStrip; 1736 tif->tif_encodetile = LogLuvEncodeTile; 1737 tif->tif_close = LogLuvClose; 1738 tif->tif_cleanup = LogLuvCleanup; 1739 1740 /* 1741 * Override parent get/set field methods. 1742 */ 1743 sp->vgetparent = tif->tif_tagmethods.vgetfield; 1744 tif->tif_tagmethods.vgetfield = LogLuvVGetField; /* hook for codec tags */ 1745 sp->vsetparent = tif->tif_tagmethods.vsetfield; 1746 tif->tif_tagmethods.vsetfield = LogLuvVSetField; /* hook for codec tags */ 1747 1748 return (1); 1749 bad: 1750 TIFFErrorExt(tif->tif_clientdata, module, 1751 "%s: No space for LogLuv state block", tif->tif_name); 1752 return (0); 1753 } 1754 #endif /* LOGLUV_SUPPORT */ 1755 1756 /* vim: set ts=8 sts=8 sw=8 noet: */ 1757 /* 1758 * Local Variables: 1759 * mode: c 1760 * c-basic-offset: 8 1761 * fill-column: 78 1762 * End: 1763 */ 1764
