1 /* $Id: tif_luv.c,v 1.35 2011-04-02 20:54:09 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 assert(sp->tbuflen >= npixels); 206 tp = (int16*) sp->tbuf; 207 } 208 _TIFFmemset((void*) tp, 0, npixels*sizeof (tp[0])); 209 210 bp = (unsigned char*) tif->tif_rawcp; 211 cc = tif->tif_rawcc; 212 /* get each byte string */ 213 for (shft = 2*8; (shft -= 8) >= 0; ) { 214 for (i = 0; i < npixels && cc > 0; ) 215 if (*bp >= 128) { /* run */ 216 rc = *bp++ + (2-128); /* TODO: potential input buffer overrun when decoding corrupt or truncated data */ 217 b = (int16)(*bp++ << shft); 218 cc -= 2; 219 while (rc-- && i < npixels) 220 tp[i++] |= b; 221 } else { /* non-run */ 222 rc = *bp++; /* nul is noop */ 223 while (--cc && rc-- && i < npixels) 224 tp[i++] |= (int16)*bp++ << shft; 225 } 226 if (i != npixels) { 227 #if defined(__WIN32__) && (defined(_MSC_VER) || defined(__MINGW32__)) 228 TIFFErrorExt(tif->tif_clientdata, module, 229 "Not enough data at row %lu (short %I64d pixels)", 230 (unsigned long) tif->tif_row, 231 (unsigned __int64) (npixels - i)); 232 #else 233 TIFFErrorExt(tif->tif_clientdata, module, 234 "Not enough data at row %lu (short %llu pixels)", 235 (unsigned long) tif->tif_row, 236 (unsigned long long) (npixels - i)); 237 #endif 238 tif->tif_rawcp = (uint8*) bp; 239 tif->tif_rawcc = cc; 240 return (0); 241 } 242 } 243 (*sp->tfunc)(sp, op, npixels); 244 tif->tif_rawcp = (uint8*) bp; 245 tif->tif_rawcc = cc; 246 return (1); 247 } 248 249 /* 250 * Decode a string of 24-bit pixels. 251 */ 252 static int 253 LogLuvDecode24(TIFF* tif, uint8* op, tmsize_t occ, uint16 s) 254 { 255 static const char module[] = "LogLuvDecode24"; 256 LogLuvState* sp = DecoderState(tif); 257 tmsize_t cc; 258 tmsize_t i; 259 tmsize_t npixels; 260 unsigned char* bp; 261 uint32* tp; 262 263 assert(s == 0); 264 assert(sp != NULL); 265 266 npixels = occ / sp->pixel_size; 267 268 if (sp->user_datafmt == SGILOGDATAFMT_RAW) 269 tp = (uint32 *)op; 270 else { 271 assert(sp->tbuflen >= npixels); 272 tp = (uint32 *) sp->tbuf; 273 } 274 /* copy to array of uint32 */ 275 bp = (unsigned char*) tif->tif_rawcp; 276 cc = tif->tif_rawcc; 277 for (i = 0; i < npixels && cc > 0; i++) { 278 tp[i] = bp[0] << 16 | bp[1] << 8 | bp[2]; 279 bp += 3; 280 cc -= 3; 281 } 282 tif->tif_rawcp = (uint8*) bp; 283 tif->tif_rawcc = cc; 284 if (i != npixels) { 285 #if defined(__WIN32__) && (defined(_MSC_VER) || defined(__MINGW32__)) 286 TIFFErrorExt(tif->tif_clientdata, module, 287 "Not enough data at row %lu (short %I64d pixels)", 288 (unsigned long) tif->tif_row, 289 (unsigned __int64) (npixels - i)); 290 #else 291 TIFFErrorExt(tif->tif_clientdata, module, 292 "Not enough data at row %lu (short %llu pixels)", 293 (unsigned long) tif->tif_row, 294 (unsigned long long) (npixels - i)); 295 #endif 296 return (0); 297 } 298 (*sp->tfunc)(sp, op, npixels); 299 return (1); 300 } 301 302 /* 303 * Decode a string of 32-bit pixels. 304 */ 305 static int 306 LogLuvDecode32(TIFF* tif, uint8* op, tmsize_t occ, uint16 s) 307 { 308 static const char module[] = "LogLuvDecode32"; 309 LogLuvState* sp; 310 int shft; 311 tmsize_t i; 312 tmsize_t npixels; 313 unsigned char* bp; 314 uint32* tp; 315 uint32 b; 316 tmsize_t cc; 317 int rc; 318 319 assert(s == 0); 320 sp = DecoderState(tif); 321 assert(sp != NULL); 322 323 npixels = occ / sp->pixel_size; 324 325 if (sp->user_datafmt == SGILOGDATAFMT_RAW) 326 tp = (uint32*) op; 327 else { 328 assert(sp->tbuflen >= npixels); 329 tp = (uint32*) sp->tbuf; 330 } 331 _TIFFmemset((void*) tp, 0, npixels*sizeof (tp[0])); 332 333 bp = (unsigned char*) tif->tif_rawcp; 334 cc = tif->tif_rawcc; 335 /* get each byte string */ 336 for (shft = 4*8; (shft -= 8) >= 0; ) { 337 for (i = 0; i < npixels && cc > 0; ) 338 if (*bp >= 128) { /* run */ 339 rc = *bp++ + (2-128); 340 b = (uint32)*bp++ << shft; 341 cc -= 2; /* TODO: potential input buffer overrun when decoding corrupt or truncated data */ 342 while (rc-- && i < npixels) 343 tp[i++] |= b; 344 } else { /* non-run */ 345 rc = *bp++; /* nul is noop */ 346 while (--cc && rc-- && i < npixels) 347 tp[i++] |= (uint32)*bp++ << shft; 348 } 349 if (i != npixels) { 350 #if defined(__WIN32__) && (defined(_MSC_VER) || defined(__MINGW32__)) 351 TIFFErrorExt(tif->tif_clientdata, module, 352 "Not enough data at row %lu (short %I64d pixels)", 353 (unsigned long) tif->tif_row, 354 (unsigned __int64) (npixels - i)); 355 #else 356 TIFFErrorExt(tif->tif_clientdata, module, 357 "Not enough data at row %lu (short %llu pixels)", 358 (unsigned long) tif->tif_row, 359 (unsigned long long) (npixels - i)); 360 #endif 361 tif->tif_rawcp = (uint8*) bp; 362 tif->tif_rawcc = cc; 363 return (0); 364 } 365 } 366 (*sp->tfunc)(sp, op, npixels); 367 tif->tif_rawcp = (uint8*) bp; 368 tif->tif_rawcc = cc; 369 return (1); 370 } 371 372 /* 373 * Decode a strip of pixels. We break it into rows to 374 * maintain synchrony with the encode algorithm, which 375 * is row by row. 376 */ 377 static int 378 LogLuvDecodeStrip(TIFF* tif, uint8* bp, tmsize_t cc, uint16 s) 379 { 380 tmsize_t rowlen = TIFFScanlineSize(tif); 381 382 assert(cc%rowlen == 0); 383 while (cc && (*tif->tif_decoderow)(tif, bp, rowlen, s)) 384 bp += rowlen, cc -= rowlen; 385 return (cc == 0); 386 } 387 388 /* 389 * Decode a tile of pixels. We break it into rows to 390 * maintain synchrony with the encode algorithm, which 391 * is row by row. 392 */ 393 static int 394 LogLuvDecodeTile(TIFF* tif, uint8* bp, tmsize_t cc, uint16 s) 395 { 396 tmsize_t rowlen = TIFFTileRowSize(tif); 397 398 assert(cc%rowlen == 0); 399 while (cc && (*tif->tif_decoderow)(tif, bp, rowlen, s)) 400 bp += rowlen, cc -= rowlen; 401 return (cc == 0); 402 } 403 404 /* 405 * Encode a row of 16-bit pixels. 406 */ 407 static int 408 LogL16Encode(TIFF* tif, uint8* bp, tmsize_t cc, uint16 s) 409 { 410 LogLuvState* sp = EncoderState(tif); 411 int shft; 412 tmsize_t i; 413 tmsize_t j; 414 tmsize_t npixels; 415 uint8* op; 416 int16* tp; 417 int16 b; 418 tmsize_t occ; 419 int rc=0, mask; 420 tmsize_t beg; 421 422 assert(s == 0); 423 assert(sp != NULL); 424 npixels = cc / sp->pixel_size; 425 426 if (sp->user_datafmt == SGILOGDATAFMT_16BIT) 427 tp = (int16*) bp; 428 else { 429 tp = (int16*) sp->tbuf; 430 assert(sp->tbuflen >= npixels); 431 (*sp->tfunc)(sp, bp, npixels); 432 } 433 /* compress each byte string */ 434 op = tif->tif_rawcp; 435 occ = tif->tif_rawdatasize - tif->tif_rawcc; 436 for (shft = 2*8; (shft -= 8) >= 0; ) 437 for (i = 0; i < npixels; i += rc) { 438 if (occ < 4) { 439 tif->tif_rawcp = op; 440 tif->tif_rawcc = tif->tif_rawdatasize - occ; 441 if (!TIFFFlushData1(tif)) 442 return (-1); 443 op = tif->tif_rawcp; 444 occ = tif->tif_rawdatasize - tif->tif_rawcc; 445 } 446 mask = 0xff << shft; /* find next run */ 447 for (beg = i; beg < npixels; beg += rc) { 448 b = (int16) (tp[beg] & mask); 449 rc = 1; 450 while (rc < 127+2 && beg+rc < npixels && 451 (tp[beg+rc] & mask) == b) 452 rc++; 453 if (rc >= MINRUN) 454 break; /* long enough */ 455 } 456 if (beg-i > 1 && beg-i < MINRUN) { 457 b = (int16) (tp[i] & mask);/*check short run */ 458 j = i+1; 459 while ((tp[j++] & mask) == b) 460 if (j == beg) { 461 *op++ = (uint8)(128-2+j-i); 462 *op++ = (uint8)(b >> shft); 463 occ -= 2; 464 i = beg; 465 break; 466 } 467 } 468 while (i < beg) { /* write out non-run */ 469 if ((j = beg-i) > 127) j = 127; 470 if (occ < j+3) { 471 tif->tif_rawcp = op; 472 tif->tif_rawcc = tif->tif_rawdatasize - occ; 473 if (!TIFFFlushData1(tif)) 474 return (-1); 475 op = tif->tif_rawcp; 476 occ = tif->tif_rawdatasize - tif->tif_rawcc; 477 } 478 *op++ = (uint8) j; occ--; 479 while (j--) { 480 *op++ = (uint8) (tp[i++] >> shft & 0xff); 481 occ--; 482 } 483 } 484 if (rc >= MINRUN) { /* write out run */ 485 *op++ = (uint8) (128-2+rc); 486 *op++ = (uint8) (tp[beg] >> shft & 0xff); 487 occ -= 2; 488 } else 489 rc = 0; 490 } 491 tif->tif_rawcp = op; 492 tif->tif_rawcc = tif->tif_rawdatasize - occ; 493 494 return (1); 495 } 496 497 /* 498 * Encode a row of 24-bit pixels. 499 */ 500 static int 501 LogLuvEncode24(TIFF* tif, uint8* bp, tmsize_t cc, uint16 s) 502 { 503 LogLuvState* sp = EncoderState(tif); 504 tmsize_t i; 505 tmsize_t npixels; 506 tmsize_t occ; 507 uint8* op; 508 uint32* tp; 509 510 assert(s == 0); 511 assert(sp != NULL); 512 npixels = cc / sp->pixel_size; 513 514 if (sp->user_datafmt == SGILOGDATAFMT_RAW) 515 tp = (uint32*) bp; 516 else { 517 tp = (uint32*) sp->tbuf; 518 assert(sp->tbuflen >= npixels); 519 (*sp->tfunc)(sp, bp, npixels); 520 } 521 /* write out encoded pixels */ 522 op = tif->tif_rawcp; 523 occ = tif->tif_rawdatasize - tif->tif_rawcc; 524 for (i = npixels; i--; ) { 525 if (occ < 3) { 526 tif->tif_rawcp = op; 527 tif->tif_rawcc = tif->tif_rawdatasize - occ; 528 if (!TIFFFlushData1(tif)) 529 return (-1); 530 op = tif->tif_rawcp; 531 occ = tif->tif_rawdatasize - tif->tif_rawcc; 532 } 533 *op++ = (uint8)(*tp >> 16); 534 *op++ = (uint8)(*tp >> 8 & 0xff); 535 *op++ = (uint8)(*tp++ & 0xff); 536 occ -= 3; 537 } 538 tif->tif_rawcp = op; 539 tif->tif_rawcc = tif->tif_rawdatasize - occ; 540 541 return (1); 542 } 543 544 /* 545 * Encode a row of 32-bit pixels. 546 */ 547 static int 548 LogLuvEncode32(TIFF* tif, uint8* bp, tmsize_t cc, uint16 s) 549 { 550 LogLuvState* sp = EncoderState(tif); 551 int shft; 552 tmsize_t i; 553 tmsize_t j; 554 tmsize_t npixels; 555 uint8* op; 556 uint32* tp; 557 uint32 b; 558 tmsize_t occ; 559 int rc=0, mask; 560 tmsize_t beg; 561 562 assert(s == 0); 563 assert(sp != NULL); 564 565 npixels = cc / sp->pixel_size; 566 567 if (sp->user_datafmt == SGILOGDATAFMT_RAW) 568 tp = (uint32*) bp; 569 else { 570 tp = (uint32*) sp->tbuf; 571 assert(sp->tbuflen >= npixels); 572 (*sp->tfunc)(sp, bp, npixels); 573 } 574 /* compress each byte string */ 575 op = tif->tif_rawcp; 576 occ = tif->tif_rawdatasize - tif->tif_rawcc; 577 for (shft = 4*8; (shft -= 8) >= 0; ) 578 for (i = 0; i < npixels; i += rc) { 579 if (occ < 4) { 580 tif->tif_rawcp = op; 581 tif->tif_rawcc = tif->tif_rawdatasize - occ; 582 if (!TIFFFlushData1(tif)) 583 return (-1); 584 op = tif->tif_rawcp; 585 occ = tif->tif_rawdatasize - tif->tif_rawcc; 586 } 587 mask = 0xff << shft; /* find next run */ 588 for (beg = i; beg < npixels; beg += rc) { 589 b = tp[beg] & mask; 590 rc = 1; 591 while (rc < 127+2 && beg+rc < npixels && 592 (tp[beg+rc] & mask) == b) 593 rc++; 594 if (rc >= MINRUN) 595 break; /* long enough */ 596 } 597 if (beg-i > 1 && beg-i < MINRUN) { 598 b = tp[i] & mask; /* check short run */ 599 j = i+1; 600 while ((tp[j++] & mask) == b) 601 if (j == beg) { 602 *op++ = (uint8)(128-2+j-i); 603 *op++ = (uint8)(b >> shft); 604 occ -= 2; 605 i = beg; 606 break; 607 } 608 } 609 while (i < beg) { /* write out non-run */ 610 if ((j = beg-i) > 127) j = 127; 611 if (occ < j+3) { 612 tif->tif_rawcp = op; 613 tif->tif_rawcc = tif->tif_rawdatasize - occ; 614 if (!TIFFFlushData1(tif)) 615 return (-1); 616 op = tif->tif_rawcp; 617 occ = tif->tif_rawdatasize - tif->tif_rawcc; 618 } 619 *op++ = (uint8) j; occ--; 620 while (j--) { 621 *op++ = (uint8)(tp[i++] >> shft & 0xff); 622 occ--; 623 } 624 } 625 if (rc >= MINRUN) { /* write out run */ 626 *op++ = (uint8) (128-2+rc); 627 *op++ = (uint8)(tp[beg] >> shft & 0xff); 628 occ -= 2; 629 } else 630 rc = 0; 631 } 632 tif->tif_rawcp = op; 633 tif->tif_rawcc = tif->tif_rawdatasize - occ; 634 635 return (1); 636 } 637 638 /* 639 * Encode a strip of pixels. We break it into rows to 640 * avoid encoding runs across row boundaries. 641 */ 642 static int 643 LogLuvEncodeStrip(TIFF* tif, uint8* bp, tmsize_t cc, uint16 s) 644 { 645 tmsize_t rowlen = TIFFScanlineSize(tif); 646 647 assert(cc%rowlen == 0); 648 while (cc && (*tif->tif_encoderow)(tif, bp, rowlen, s) == 1) 649 bp += rowlen, cc -= rowlen; 650 return (cc == 0); 651 } 652 653 /* 654 * Encode a tile of pixels. We break it into rows to 655 * avoid encoding runs across row boundaries. 656 */ 657 static int 658 LogLuvEncodeTile(TIFF* tif, uint8* bp, tmsize_t cc, uint16 s) 659 { 660 tmsize_t rowlen = TIFFTileRowSize(tif); 661 662 assert(cc%rowlen == 0); 663 while (cc && (*tif->tif_encoderow)(tif, bp, rowlen, s) == 1) 664 bp += rowlen, cc -= rowlen; 665 return (cc == 0); 666 } 667 668 /* 669 * Encode/Decode functions for converting to and from user formats. 670 */ 671 672 #include "uvcode.h" 673 674 #ifndef UVSCALE 675 #define U_NEU 0.210526316 676 #define V_NEU 0.473684211 677 #define UVSCALE 410. 678 #endif 679 680 #ifndef M_LN2 681 #define M_LN2 0.69314718055994530942 682 #endif 683 #ifndef M_PI 684 #define M_PI 3.14159265358979323846 685 #endif 686 #define log2(x) ((1./M_LN2)*log(x)) 687 #define exp2(x) exp(M_LN2*(x)) 688 689 #define itrunc(x,m) ((m)==SGILOGENCODE_NODITHER ? \ 690 (int)(x) : \ 691 (int)((x) + rand()*(1./RAND_MAX) - .5)) 692 693 #if !LOGLUV_PUBLIC 694 static 695 #endif 696 double 697 LogL16toY(int p16) /* compute luminance from 16-bit LogL */ 698 { 699 int Le = p16 & 0x7fff; 700 double Y; 701 702 if (!Le) 703 return (0.); 704 Y = exp(M_LN2/256.*(Le+.5) - M_LN2*64.); 705 return (!(p16 & 0x8000) ? Y : -Y); 706 } 707 708 #if !LOGLUV_PUBLIC 709 static 710 #endif 711 int 712 LogL16fromY(double Y, int em) /* get 16-bit LogL from Y */ 713 { 714 if (Y >= 1.8371976e19) 715 return (0x7fff); 716 if (Y <= -1.8371976e19) 717 return (0xffff); 718 if (Y > 5.4136769e-20) 719 return itrunc(256.*(log2(Y) + 64.), em); 720 if (Y < -5.4136769e-20) 721 return (~0x7fff | itrunc(256.*(log2(-Y) + 64.), em)); 722 return (0); 723 } 724 725 static void 726 L16toY(LogLuvState* sp, uint8* op, tmsize_t n) 727 { 728 int16* l16 = (int16*) sp->tbuf; 729 float* yp = (float*) op; 730 731 while (n-- > 0) 732 *yp++ = (float)LogL16toY(*l16++); 733 } 734 735 static void 736 L16toGry(LogLuvState* sp, uint8* op, tmsize_t n) 737 { 738 int16* l16 = (int16*) sp->tbuf; 739 uint8* gp = (uint8*) op; 740 741 while (n-- > 0) { 742 double Y = LogL16toY(*l16++); 743 *gp++ = (uint8) ((Y <= 0.) ? 0 : (Y >= 1.) ? 255 : (int)(256.*sqrt(Y))); 744 } 745 } 746 747 static void 748 L16fromY(LogLuvState* sp, uint8* op, tmsize_t n) 749 { 750 int16* l16 = (int16*) sp->tbuf; 751 float* yp = (float*) op; 752 753 while (n-- > 0) 754 *l16++ = (int16) (LogL16fromY(*yp++, sp->encode_meth)); 755 } 756 757 #if !LOGLUV_PUBLIC 758 static 759 #endif 760 void 761 XYZtoRGB24(float xyz[3], uint8 rgb[3]) 762 { 763 double r, g, b; 764 /* assume CCIR-709 primaries */ 765 r = 2.690*xyz[0] + -1.276*xyz[1] + -0.414*xyz[2]; 766 g = -1.022*xyz[0] + 1.978*xyz[1] + 0.044*xyz[2]; 767 b = 0.061*xyz[0] + -0.224*xyz[1] + 1.163*xyz[2]; 768 /* assume 2.0 gamma for speed */ 769 /* could use integer sqrt approx., but this is probably faster */ 770 rgb[0] = (uint8)((r<=0.) ? 0 : (r >= 1.) ? 255 : (int)(256.*sqrt(r))); 771 rgb[1] = (uint8)((g<=0.) ? 0 : (g >= 1.) ? 255 : (int)(256.*sqrt(g))); 772 rgb[2] = (uint8)((b<=0.) ? 0 : (b >= 1.) ? 255 : (int)(256.*sqrt(b))); 773 } 774 775 #if !LOGLUV_PUBLIC 776 static 777 #endif 778 double 779 LogL10toY(int p10) /* compute luminance from 10-bit LogL */ 780 { 781 if (p10 == 0) 782 return (0.); 783 return (exp(M_LN2/64.*(p10+.5) - M_LN2*12.)); 784 } 785 786 #if !LOGLUV_PUBLIC 787 static 788 #endif 789 int 790 LogL10fromY(double Y, int em) /* get 10-bit LogL from Y */ 791 { 792 if (Y >= 15.742) 793 return (0x3ff); 794 else if (Y <= .00024283) 795 return (0); 796 else 797 return itrunc(64.*(log2(Y) + 12.), em); 798 } 799 800 #define NANGLES 100 801 #define uv2ang(u, v) ( (NANGLES*.499999999/M_PI) \ 802 * atan2((v)-V_NEU,(u)-U_NEU) + .5*NANGLES ) 803 804 static int 805 oog_encode(double u, double v) /* encode out-of-gamut chroma */ 806 { 807 static int oog_table[NANGLES]; 808 static int initialized = 0; 809 register int i; 810 811 if (!initialized) { /* set up perimeter table */ 812 double eps[NANGLES], ua, va, ang, epsa; 813 int ui, vi, ustep; 814 for (i = NANGLES; i--; ) 815 eps[i] = 2.; 816 for (vi = UV_NVS; vi--; ) { 817 va = UV_VSTART + (vi+.5)*UV_SQSIZ; 818 ustep = uv_row[vi].nus-1; 819 if (vi == UV_NVS-1 || vi == 0 || ustep <= 0) 820 ustep = 1; 821 for (ui = uv_row[vi].nus-1; ui >= 0; ui -= ustep) { 822 ua = uv_row[vi].ustart + (ui+.5)*UV_SQSIZ; 823 ang = uv2ang(ua, va); 824 i = (int) ang; 825 epsa = fabs(ang - (i+.5)); 826 if (epsa < eps[i]) { 827 oog_table[i] = uv_row[vi].ncum + ui; 828 eps[i] = epsa; 829 } 830 } 831 } 832 for (i = NANGLES; i--; ) /* fill any holes */ 833 if (eps[i] > 1.5) { 834 int i1, i2; 835 for (i1 = 1; i1 < NANGLES/2; i1++) 836 if (eps[(i+i1)%NANGLES] < 1.5) 837 break; 838 for (i2 = 1; i2 < NANGLES/2; i2++) 839 if (eps[(i+NANGLES-i2)%NANGLES] < 1.5) 840 break; 841 if (i1 < i2) 842 oog_table[i] = 843 oog_table[(i+i1)%NANGLES]; 844 else 845 oog_table[i] = 846 oog_table[(i+NANGLES-i2)%NANGLES]; 847 } 848 initialized = 1; 849 } 850 i = (int) uv2ang(u, v); /* look up hue angle */ 851 return (oog_table[i]); 852 } 853 854 #undef uv2ang 855 #undef NANGLES 856 857 #if !LOGLUV_PUBLIC 858 static 859 #endif 860 int 861 uv_encode(double u, double v, int em) /* encode (u',v') coordinates */ 862 { 863 register int vi, ui; 864 865 if (v < UV_VSTART) 866 return oog_encode(u, v); 867 vi = itrunc((v - UV_VSTART)*(1./UV_SQSIZ), em); 868 if (vi >= UV_NVS) 869 return oog_encode(u, v); 870 if (u < uv_row[vi].ustart) 871 return oog_encode(u, v); 872 ui = itrunc((u - uv_row[vi].ustart)*(1./UV_SQSIZ), em); 873 if (ui >= uv_row[vi].nus) 874 return oog_encode(u, v); 875 876 return (uv_row[vi].ncum + ui); 877 } 878 879 #if !LOGLUV_PUBLIC 880 static 881 #endif 882 int 883 uv_decode(double *up, double *vp, int c) /* decode (u',v') index */ 884 { 885 int upper, lower; 886 register int ui, vi; 887 888 if (c < 0 || c >= UV_NDIVS) 889 return (-1); 890 lower = 0; /* binary search */ 891 upper = UV_NVS; 892 while (upper - lower > 1) { 893 vi = (lower + upper) >> 1; 894 ui = c - uv_row[vi].ncum; 895 if (ui > 0) 896 lower = vi; 897 else if (ui < 0) 898 upper = vi; 899 else { 900 lower = vi; 901 break; 902 } 903 } 904 vi = lower; 905 ui = c - uv_row[vi].ncum; 906 *up = uv_row[vi].ustart + (ui+.5)*UV_SQSIZ; 907 *vp = UV_VSTART + (vi+.5)*UV_SQSIZ; 908 return (0); 909 } 910 911 #if !LOGLUV_PUBLIC 912 static 913 #endif 914 void 915 LogLuv24toXYZ(uint32 p, float XYZ[3]) 916 { 917 int Ce; 918 double L, u, v, s, x, y; 919 /* decode luminance */ 920 L = LogL10toY(p>>14 & 0x3ff); 921 if (L <= 0.) { 922 XYZ[0] = XYZ[1] = XYZ[2] = 0.; 923 return; 924 } 925 /* decode color */ 926 Ce = p & 0x3fff; 927 if (uv_decode(&u, &v, Ce) < 0) { 928 u = U_NEU; v = V_NEU; 929 } 930 s = 1./(6.*u - 16.*v + 12.); 931 x = 9.*u * s; 932 y = 4.*v * s; 933 /* convert to XYZ */ 934 XYZ[0] = (float)(x/y * L); 935 XYZ[1] = (float)L; 936 XYZ[2] = (float)((1.-x-y)/y * L); 937 } 938 939 #if !LOGLUV_PUBLIC 940 static 941 #endif 942 uint32 943 LogLuv24fromXYZ(float XYZ[3], int em) 944 { 945 int Le, Ce; 946 double u, v, s; 947 /* encode luminance */ 948 Le = LogL10fromY(XYZ[1], em); 949 /* encode color */ 950 s = XYZ[0] + 15.*XYZ[1] + 3.*XYZ[2]; 951 if (!Le || s <= 0.) { 952 u = U_NEU; 953 v = V_NEU; 954 } else { 955 u = 4.*XYZ[0] / s; 956 v = 9.*XYZ[1] / s; 957 } 958 Ce = uv_encode(u, v, em); 959 if (Ce < 0) /* never happens */ 960 Ce = uv_encode(U_NEU, V_NEU, SGILOGENCODE_NODITHER); 961 /* combine encodings */ 962 return (Le << 14 | Ce); 963 } 964 965 static void 966 Luv24toXYZ(LogLuvState* sp, uint8* op, tmsize_t n) 967 { 968 uint32* luv = (uint32*) sp->tbuf; 969 float* xyz = (float*) op; 970 971 while (n-- > 0) { 972 LogLuv24toXYZ(*luv, xyz); 973 xyz += 3; 974 luv++; 975 } 976 } 977 978 static void 979 Luv24toLuv48(LogLuvState* sp, uint8* op, tmsize_t n) 980 { 981 uint32* luv = (uint32*) sp->tbuf; 982 int16* luv3 = (int16*) op; 983 984 while (n-- > 0) { 985 double u, v; 986 987 *luv3++ = (int16)((*luv >> 12 & 0xffd) + 13314); 988 if (uv_decode(&u, &v, *luv&0x3fff) < 0) { 989 u = U_NEU; 990 v = V_NEU; 991 } 992 *luv3++ = (int16)(u * (1L<<15)); 993 *luv3++ = (int16)(v * (1L<<15)); 994 luv++; 995 } 996 } 997 998 static void 999 Luv24toRGB(LogLuvState* sp, uint8* op, tmsize_t n) 1000 { 1001 uint32* luv = (uint32*) sp->tbuf; 1002 uint8* rgb = (uint8*) op; 1003 1004 while (n-- > 0) { 1005 float xyz[3]; 1006 1007 LogLuv24toXYZ(*luv++, xyz); 1008 XYZtoRGB24(xyz, rgb); 1009 rgb += 3; 1010 } 1011 } 1012 1013 static void 1014 Luv24fromXYZ(LogLuvState* sp, uint8* op, tmsize_t n) 1015 { 1016 uint32* luv = (uint32*) sp->tbuf; 1017 float* xyz = (float*) op; 1018 1019 while (n-- > 0) { 1020 *luv++ = LogLuv24fromXYZ(xyz, sp->encode_meth); 1021 xyz += 3; 1022 } 1023 } 1024 1025 static void 1026 Luv24fromLuv48(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 int Le, Ce; 1033 1034 if (luv3[0] <= 0) 1035 Le = 0; 1036 else if (luv3[0] >= (1<<12)+3314) 1037 Le = (1<<10) - 1; 1038 else if (sp->encode_meth == SGILOGENCODE_NODITHER) 1039 Le = (luv3[0]-3314) >> 2; 1040 else 1041 Le = itrunc(.25*(luv3[0]-3314.), sp->encode_meth); 1042 1043 Ce = uv_encode((luv3[1]+.5)/(1<<15), (luv3[2]+.5)/(1<<15), 1044 sp->encode_meth); 1045 if (Ce < 0) /* never happens */ 1046 Ce = uv_encode(U_NEU, V_NEU, SGILOGENCODE_NODITHER); 1047 *luv++ = (uint32)Le << 14 | Ce; 1048 luv3 += 3; 1049 } 1050 } 1051 1052 #if !LOGLUV_PUBLIC 1053 static 1054 #endif 1055 void 1056 LogLuv32toXYZ(uint32 p, float XYZ[3]) 1057 { 1058 double L, u, v, s, x, y; 1059 /* decode luminance */ 1060 L = LogL16toY((int)p >> 16); 1061 if (L <= 0.) { 1062 XYZ[0] = XYZ[1] = XYZ[2] = 0.; 1063 return; 1064 } 1065 /* decode color */ 1066 u = 1./UVSCALE * ((p>>8 & 0xff) + .5); 1067 v = 1./UVSCALE * ((p & 0xff) + .5); 1068 s = 1./(6.*u - 16.*v + 12.); 1069 x = 9.*u * s; 1070 y = 4.*v * s; 1071 /* convert to XYZ */ 1072 XYZ[0] = (float)(x/y * L); 1073 XYZ[1] = (float)L; 1074 XYZ[2] = (float)((1.-x-y)/y * L); 1075 } 1076 1077 #if !LOGLUV_PUBLIC 1078 static 1079 #endif 1080 uint32 1081 LogLuv32fromXYZ(float XYZ[3], int em) 1082 { 1083 unsigned int Le, ue, ve; 1084 double u, v, s; 1085 /* encode luminance */ 1086 Le = (unsigned int)LogL16fromY(XYZ[1], em); 1087 /* encode color */ 1088 s = XYZ[0] + 15.*XYZ[1] + 3.*XYZ[2]; 1089 if (!Le || s <= 0.) { 1090 u = U_NEU; 1091 v = V_NEU; 1092 } else { 1093 u = 4.*XYZ[0] / s; 1094 v = 9.*XYZ[1] / s; 1095 } 1096 if (u <= 0.) ue = 0; 1097 else ue = itrunc(UVSCALE*u, em); 1098 if (ue > 255) ue = 255; 1099 if (v <= 0.) ve = 0; 1100 else ve = itrunc(UVSCALE*v, em); 1101 if (ve > 255) ve = 255; 1102 /* combine encodings */ 1103 return (Le << 16 | ue << 8 | ve); 1104 } 1105 1106 static void 1107 Luv32toXYZ(LogLuvState* sp, uint8* op, tmsize_t n) 1108 { 1109 uint32* luv = (uint32*) sp->tbuf; 1110 float* xyz = (float*) op; 1111 1112 while (n-- > 0) { 1113 LogLuv32toXYZ(*luv++, xyz); 1114 xyz += 3; 1115 } 1116 } 1117 1118 static void 1119 Luv32toLuv48(LogLuvState* sp, uint8* op, tmsize_t n) 1120 { 1121 uint32* luv = (uint32*) sp->tbuf; 1122 int16* luv3 = (int16*) op; 1123 1124 while (n-- > 0) { 1125 double u, v; 1126 1127 *luv3++ = (int16)(*luv >> 16); 1128 u = 1./UVSCALE * ((*luv>>8 & 0xff) + .5); 1129 v = 1./UVSCALE * ((*luv & 0xff) + .5); 1130 *luv3++ = (int16)(u * (1L<<15)); 1131 *luv3++ = (int16)(v * (1L<<15)); 1132 luv++; 1133 } 1134 } 1135 1136 static void 1137 Luv32toRGB(LogLuvState* sp, uint8* op, tmsize_t n) 1138 { 1139 uint32* luv = (uint32*) sp->tbuf; 1140 uint8* rgb = (uint8*) op; 1141 1142 while (n-- > 0) { 1143 float xyz[3]; 1144 1145 LogLuv32toXYZ(*luv++, xyz); 1146 XYZtoRGB24(xyz, rgb); 1147 rgb += 3; 1148 } 1149 } 1150 1151 static void 1152 Luv32fromXYZ(LogLuvState* sp, uint8* op, tmsize_t n) 1153 { 1154 uint32* luv = (uint32*) sp->tbuf; 1155 float* xyz = (float*) op; 1156 1157 while (n-- > 0) { 1158 *luv++ = LogLuv32fromXYZ(xyz, sp->encode_meth); 1159 xyz += 3; 1160 } 1161 } 1162 1163 static void 1164 Luv32fromLuv48(LogLuvState* sp, uint8* op, tmsize_t n) 1165 { 1166 uint32* luv = (uint32*) sp->tbuf; 1167 int16* luv3 = (int16*) op; 1168 1169 if (sp->encode_meth == SGILOGENCODE_NODITHER) { 1170 while (n-- > 0) { 1171 *luv++ = (uint32)luv3[0] << 16 | 1172 (luv3[1]*(uint32)(UVSCALE+.5) >> 7 & 0xff00) | 1173 (luv3[2]*(uint32)(UVSCALE+.5) >> 15 & 0xff); 1174 luv3 += 3; 1175 } 1176 return; 1177 } 1178 while (n-- > 0) { 1179 *luv++ = (uint32)luv3[0] << 16 | 1180 (itrunc(luv3[1]*(UVSCALE/(1<<15)), sp->encode_meth) << 8 & 0xff00) | 1181 (itrunc(luv3[2]*(UVSCALE/(1<<15)), sp->encode_meth) & 0xff); 1182 luv3 += 3; 1183 } 1184 } 1185 1186 static void 1187 _logLuvNop(LogLuvState* sp, uint8* op, tmsize_t n) 1188 { 1189 (void) sp; (void) op; (void) n; 1190 } 1191 1192 static int 1193 LogL16GuessDataFmt(TIFFDirectory *td) 1194 { 1195 #define PACK(s,b,f) (((b)<<6)|((s)<<3)|(f)) 1196 switch (PACK(td->td_samplesperpixel, td->td_bitspersample, td->td_sampleformat)) { 1197 case PACK(1, 32, SAMPLEFORMAT_IEEEFP): 1198 return (SGILOGDATAFMT_FLOAT); 1199 case PACK(1, 16, SAMPLEFORMAT_VOID): 1200 case PACK(1, 16, SAMPLEFORMAT_INT): 1201 case PACK(1, 16, SAMPLEFORMAT_UINT): 1202 return (SGILOGDATAFMT_16BIT); 1203 case PACK(1, 8, SAMPLEFORMAT_VOID): 1204 case PACK(1, 8, SAMPLEFORMAT_UINT): 1205 return (SGILOGDATAFMT_8BIT); 1206 } 1207 #undef PACK 1208 return (SGILOGDATAFMT_UNKNOWN); 1209 } 1210 1211 static tmsize_t 1212 multiply_ms(tmsize_t m1, tmsize_t m2) 1213 { 1214 tmsize_t bytes = m1 * m2; 1215 1216 if (m1 && bytes / m1 != m2) 1217 bytes = 0; 1218 1219 return bytes; 1220 } 1221 1222 static int 1223 LogL16InitState(TIFF* tif) 1224 { 1225 static const char module[] = "LogL16InitState"; 1226 TIFFDirectory *td = &tif->tif_dir; 1227 LogLuvState* sp = DecoderState(tif); 1228 1229 assert(sp != NULL); 1230 assert(td->td_photometric == PHOTOMETRIC_LOGL); 1231 1232 /* for some reason, we can't do this in TIFFInitLogL16 */ 1233 if (sp->user_datafmt == SGILOGDATAFMT_UNKNOWN) 1234 sp->user_datafmt = LogL16GuessDataFmt(td); 1235 switch (sp->user_datafmt) { 1236 case SGILOGDATAFMT_FLOAT: 1237 sp->pixel_size = sizeof (float); 1238 break; 1239 case SGILOGDATAFMT_16BIT: 1240 sp->pixel_size = sizeof (int16); 1241 break; 1242 case SGILOGDATAFMT_8BIT: 1243 sp->pixel_size = sizeof (uint8); 1244 break; 1245 default: 1246 TIFFErrorExt(tif->tif_clientdata, module, 1247 "No support for converting user data format to LogL"); 1248 return (0); 1249 } 1250 if( isTiled(tif) ) 1251 sp->tbuflen = multiply_ms(td->td_tilewidth, td->td_tilelength); 1252 else 1253 sp->tbuflen = multiply_ms(td->td_imagewidth, td->td_rowsperstrip); 1254 if (multiply_ms(sp->tbuflen, sizeof (int16)) == 0 || 1255 (sp->tbuf = (uint8*) _TIFFmalloc(sp->tbuflen * sizeof (int16))) == NULL) { 1256 TIFFErrorExt(tif->tif_clientdata, module, "No space for SGILog translation buffer"); 1257 return (0); 1258 } 1259 return (1); 1260 } 1261 1262 static int 1263 LogLuvGuessDataFmt(TIFFDirectory *td) 1264 { 1265 int guess; 1266 1267 /* 1268 * If the user didn't tell us their datafmt, 1269 * take our best guess from the bitspersample. 1270 */ 1271 #define PACK(a,b) (((a)<<3)|(b)) 1272 switch (PACK(td->td_bitspersample, td->td_sampleformat)) { 1273 case PACK(32, SAMPLEFORMAT_IEEEFP): 1274 guess = SGILOGDATAFMT_FLOAT; 1275 break; 1276 case PACK(32, SAMPLEFORMAT_VOID): 1277 case PACK(32, SAMPLEFORMAT_UINT): 1278 case PACK(32, SAMPLEFORMAT_INT): 1279 guess = SGILOGDATAFMT_RAW; 1280 break; 1281 case PACK(16, SAMPLEFORMAT_VOID): 1282 case PACK(16, SAMPLEFORMAT_INT): 1283 case PACK(16, SAMPLEFORMAT_UINT): 1284 guess = SGILOGDATAFMT_16BIT; 1285 break; 1286 case PACK( 8, SAMPLEFORMAT_VOID): 1287 case PACK( 8, SAMPLEFORMAT_UINT): 1288 guess = SGILOGDATAFMT_8BIT; 1289 break; 1290 default: 1291 guess = SGILOGDATAFMT_UNKNOWN; 1292 break; 1293 #undef PACK 1294 } 1295 /* 1296 * Double-check samples per pixel. 1297 */ 1298 switch (td->td_samplesperpixel) { 1299 case 1: 1300 if (guess != SGILOGDATAFMT_RAW) 1301 guess = SGILOGDATAFMT_UNKNOWN; 1302 break; 1303 case 3: 1304 if (guess == SGILOGDATAFMT_RAW) 1305 guess = SGILOGDATAFMT_UNKNOWN; 1306 break; 1307 default: 1308 guess = SGILOGDATAFMT_UNKNOWN; 1309 break; 1310 } 1311 return (guess); 1312 } 1313 1314 static int 1315 LogLuvInitState(TIFF* tif) 1316 { 1317 static const char module[] = "LogLuvInitState"; 1318 TIFFDirectory* td = &tif->tif_dir; 1319 LogLuvState* sp = DecoderState(tif); 1320 1321 assert(sp != NULL); 1322 assert(td->td_photometric == PHOTOMETRIC_LOGLUV); 1323 1324 /* for some reason, we can't do this in TIFFInitLogLuv */ 1325 if (td->td_planarconfig != PLANARCONFIG_CONTIG) { 1326 TIFFErrorExt(tif->tif_clientdata, module, 1327 "SGILog compression cannot handle non-contiguous data"); 1328 return (0); 1329 } 1330 if (sp->user_datafmt == SGILOGDATAFMT_UNKNOWN) 1331 sp->user_datafmt = LogLuvGuessDataFmt(td); 1332 switch (sp->user_datafmt) { 1333 case SGILOGDATAFMT_FLOAT: 1334 sp->pixel_size = 3*sizeof (float); 1335 break; 1336 case SGILOGDATAFMT_16BIT: 1337 sp->pixel_size = 3*sizeof (int16); 1338 break; 1339 case SGILOGDATAFMT_RAW: 1340 sp->pixel_size = sizeof (uint32); 1341 break; 1342 case SGILOGDATAFMT_8BIT: 1343 sp->pixel_size = 3*sizeof (uint8); 1344 break; 1345 default: 1346 TIFFErrorExt(tif->tif_clientdata, module, 1347 "No support for converting user data format to LogLuv"); 1348 return (0); 1349 } 1350 if( isTiled(tif) ) 1351 sp->tbuflen = multiply_ms(td->td_tilewidth, td->td_tilelength); 1352 else 1353 sp->tbuflen = multiply_ms(td->td_imagewidth, td->td_rowsperstrip); 1354 if (multiply_ms(sp->tbuflen, sizeof (uint32)) == 0 || 1355 (sp->tbuf = (uint8*) _TIFFmalloc(sp->tbuflen * sizeof (uint32))) == NULL) { 1356 TIFFErrorExt(tif->tif_clientdata, module, "No space for SGILog translation buffer"); 1357 return (0); 1358 } 1359 return (1); 1360 } 1361 1362 static int 1363 LogLuvFixupTags(TIFF* tif) 1364 { 1365 (void) tif; 1366 return (1); 1367 } 1368 1369 static int 1370 LogLuvSetupDecode(TIFF* tif) 1371 { 1372 static const char module[] = "LogLuvSetupDecode"; 1373 LogLuvState* sp = DecoderState(tif); 1374 TIFFDirectory* td = &tif->tif_dir; 1375 1376 tif->tif_postdecode = _TIFFNoPostDecode; 1377 switch (td->td_photometric) { 1378 case PHOTOMETRIC_LOGLUV: 1379 if (!LogLuvInitState(tif)) 1380 break; 1381 if (td->td_compression == COMPRESSION_SGILOG24) { 1382 tif->tif_decoderow = LogLuvDecode24; 1383 switch (sp->user_datafmt) { 1384 case SGILOGDATAFMT_FLOAT: 1385 sp->tfunc = Luv24toXYZ; 1386 break; 1387 case SGILOGDATAFMT_16BIT: 1388 sp->tfunc = Luv24toLuv48; 1389 break; 1390 case SGILOGDATAFMT_8BIT: 1391 sp->tfunc = Luv24toRGB; 1392 break; 1393 } 1394 } else { 1395 tif->tif_decoderow = LogLuvDecode32; 1396 switch (sp->user_datafmt) { 1397 case SGILOGDATAFMT_FLOAT: 1398 sp->tfunc = Luv32toXYZ; 1399 break; 1400 case SGILOGDATAFMT_16BIT: 1401 sp->tfunc = Luv32toLuv48; 1402 break; 1403 case SGILOGDATAFMT_8BIT: 1404 sp->tfunc = Luv32toRGB; 1405 break; 1406 } 1407 } 1408 return (1); 1409 case PHOTOMETRIC_LOGL: 1410 if (!LogL16InitState(tif)) 1411 break; 1412 tif->tif_decoderow = LogL16Decode; 1413 switch (sp->user_datafmt) { 1414 case SGILOGDATAFMT_FLOAT: 1415 sp->tfunc = L16toY; 1416 break; 1417 case SGILOGDATAFMT_8BIT: 1418 sp->tfunc = L16toGry; 1419 break; 1420 } 1421 return (1); 1422 default: 1423 TIFFErrorExt(tif->tif_clientdata, module, 1424 "Inappropriate photometric interpretation %d for SGILog compression; %s", 1425 td->td_photometric, "must be either LogLUV or LogL"); 1426 break; 1427 } 1428 return (0); 1429 } 1430 1431 static int 1432 LogLuvSetupEncode(TIFF* tif) 1433 { 1434 static const char module[] = "LogLuvSetupEncode"; 1435 LogLuvState* sp = EncoderState(tif); 1436 TIFFDirectory* td = &tif->tif_dir; 1437 1438 switch (td->td_photometric) { 1439 case PHOTOMETRIC_LOGLUV: 1440 if (!LogLuvInitState(tif)) 1441 break; 1442 if (td->td_compression == COMPRESSION_SGILOG24) { 1443 tif->tif_encoderow = LogLuvEncode24; 1444 switch (sp->user_datafmt) { 1445 case SGILOGDATAFMT_FLOAT: 1446 sp->tfunc = Luv24fromXYZ; 1447 break; 1448 case SGILOGDATAFMT_16BIT: 1449 sp->tfunc = Luv24fromLuv48; 1450 break; 1451 case SGILOGDATAFMT_RAW: 1452 break; 1453 default: 1454 goto notsupported; 1455 } 1456 } else { 1457 tif->tif_encoderow = LogLuvEncode32; 1458 switch (sp->user_datafmt) { 1459 case SGILOGDATAFMT_FLOAT: 1460 sp->tfunc = Luv32fromXYZ; 1461 break; 1462 case SGILOGDATAFMT_16BIT: 1463 sp->tfunc = Luv32fromLuv48; 1464 break; 1465 case SGILOGDATAFMT_RAW: 1466 break; 1467 default: 1468 goto notsupported; 1469 } 1470 } 1471 break; 1472 case PHOTOMETRIC_LOGL: 1473 if (!LogL16InitState(tif)) 1474 break; 1475 tif->tif_encoderow = LogL16Encode; 1476 switch (sp->user_datafmt) { 1477 case SGILOGDATAFMT_FLOAT: 1478 sp->tfunc = L16fromY; 1479 break; 1480 case SGILOGDATAFMT_16BIT: 1481 break; 1482 default: 1483 goto notsupported; 1484 } 1485 break; 1486 default: 1487 TIFFErrorExt(tif->tif_clientdata, module, 1488 "Inappropriate photometric interpretation %d for SGILog compression; %s", 1489 td->td_photometric, "must be either LogLUV or LogL"); 1490 break; 1491 } 1492 return (1); 1493 notsupported: 1494 TIFFErrorExt(tif->tif_clientdata, module, 1495 "SGILog compression supported only for %s, or raw data", 1496 td->td_photometric == PHOTOMETRIC_LOGL ? "Y, L" : "XYZ, Luv"); 1497 return (0); 1498 } 1499 1500 static void 1501 LogLuvClose(TIFF* tif) 1502 { 1503 TIFFDirectory *td = &tif->tif_dir; 1504 1505 /* 1506 * For consistency, we always want to write out the same 1507 * bitspersample and sampleformat for our TIFF file, 1508 * regardless of the data format being used by the application. 1509 * Since this routine is called after tags have been set but 1510 * before they have been recorded in the file, we reset them here. 1511 */ 1512 td->td_samplesperpixel = 1513 (td->td_photometric == PHOTOMETRIC_LOGL) ? 1 : 3; 1514 td->td_bitspersample = 16; 1515 td->td_sampleformat = SAMPLEFORMAT_INT; 1516 } 1517 1518 static void 1519 LogLuvCleanup(TIFF* tif) 1520 { 1521 LogLuvState* sp = (LogLuvState *)tif->tif_data; 1522 1523 assert(sp != 0); 1524 1525 tif->tif_tagmethods.vgetfield = sp->vgetparent; 1526 tif->tif_tagmethods.vsetfield = sp->vsetparent; 1527 1528 if (sp->tbuf) 1529 _TIFFfree(sp->tbuf); 1530 _TIFFfree(sp); 1531 tif->tif_data = NULL; 1532 1533 _TIFFSetDefaultCompressionState(tif); 1534 } 1535 1536 static int 1537 LogLuvVSetField(TIFF* tif, uint32 tag, va_list ap) 1538 { 1539 static const char module[] = "LogLuvVSetField"; 1540 LogLuvState* sp = DecoderState(tif); 1541 int bps, fmt; 1542 1543 switch (tag) { 1544 case TIFFTAG_SGILOGDATAFMT: 1545 sp->user_datafmt = (int) va_arg(ap, int); 1546 /* 1547 * Tweak the TIFF header so that the rest of libtiff knows what 1548 * size of data will be passed between app and library, and 1549 * assume that the app knows what it is doing and is not 1550 * confused by these header manipulations... 1551 */ 1552 switch (sp->user_datafmt) { 1553 case SGILOGDATAFMT_FLOAT: 1554 bps = 32, fmt = SAMPLEFORMAT_IEEEFP; 1555 break; 1556 case SGILOGDATAFMT_16BIT: 1557 bps = 16, fmt = SAMPLEFORMAT_INT; 1558 break; 1559 case SGILOGDATAFMT_RAW: 1560 bps = 32, fmt = SAMPLEFORMAT_UINT; 1561 TIFFSetField(tif, TIFFTAG_SAMPLESPERPIXEL, 1); 1562 break; 1563 case SGILOGDATAFMT_8BIT: 1564 bps = 8, fmt = SAMPLEFORMAT_UINT; 1565 break; 1566 default: 1567 TIFFErrorExt(tif->tif_clientdata, tif->tif_name, 1568 "Unknown data format %d for LogLuv compression", 1569 sp->user_datafmt); 1570 return (0); 1571 } 1572 TIFFSetField(tif, TIFFTAG_BITSPERSAMPLE, bps); 1573 TIFFSetField(tif, TIFFTAG_SAMPLEFORMAT, fmt); 1574 /* 1575 * Must recalculate sizes should bits/sample change. 1576 */ 1577 tif->tif_tilesize = isTiled(tif) ? TIFFTileSize(tif) : (tmsize_t) -1; 1578 tif->tif_scanlinesize = TIFFScanlineSize(tif); 1579 return (1); 1580 case TIFFTAG_SGILOGENCODE: 1581 sp->encode_meth = (int) va_arg(ap, int); 1582 if (sp->encode_meth != SGILOGENCODE_NODITHER && 1583 sp->encode_meth != SGILOGENCODE_RANDITHER) { 1584 TIFFErrorExt(tif->tif_clientdata, module, 1585 "Unknown encoding %d for LogLuv compression", 1586 sp->encode_meth); 1587 return (0); 1588 } 1589 return (1); 1590 default: 1591 return (*sp->vsetparent)(tif, tag, ap); 1592 } 1593 } 1594 1595 static int 1596 LogLuvVGetField(TIFF* tif, uint32 tag, va_list ap) 1597 { 1598 LogLuvState *sp = (LogLuvState *)tif->tif_data; 1599 1600 switch (tag) { 1601 case TIFFTAG_SGILOGDATAFMT: 1602 *va_arg(ap, int*) = sp->user_datafmt; 1603 return (1); 1604 default: 1605 return (*sp->vgetparent)(tif, tag, ap); 1606 } 1607 } 1608 1609 static const TIFFField LogLuvFields[] = { 1610 { TIFFTAG_SGILOGDATAFMT, 0, 0, TIFF_SHORT, 0, TIFF_SETGET_INT, TIFF_SETGET_UNDEFINED, FIELD_PSEUDO, TRUE, FALSE, "SGILogDataFmt", NULL}, 1611 { TIFFTAG_SGILOGENCODE, 0, 0, TIFF_SHORT, 0, TIFF_SETGET_INT, TIFF_SETGET_UNDEFINED, FIELD_PSEUDO, TRUE, FALSE, "SGILogEncode", NULL} 1612 }; 1613 1614 int 1615 TIFFInitSGILog(TIFF* tif, int scheme) 1616 { 1617 static const char module[] = "TIFFInitSGILog"; 1618 LogLuvState* sp; 1619 1620 assert(scheme == COMPRESSION_SGILOG24 || scheme == COMPRESSION_SGILOG); 1621 1622 /* 1623 * Merge codec-specific tag information. 1624 */ 1625 if (!_TIFFMergeFields(tif, LogLuvFields, 1626 TIFFArrayCount(LogLuvFields))) { 1627 TIFFErrorExt(tif->tif_clientdata, module, 1628 "Merging SGILog codec-specific tags failed"); 1629 return 0; 1630 } 1631 1632 /* 1633 * Allocate state block so tag methods have storage to record values. 1634 */ 1635 tif->tif_data = (uint8*) _TIFFmalloc(sizeof (LogLuvState)); 1636 if (tif->tif_data == NULL) 1637 goto bad; 1638 sp = (LogLuvState*) tif->tif_data; 1639 _TIFFmemset((void*)sp, 0, sizeof (*sp)); 1640 sp->user_datafmt = SGILOGDATAFMT_UNKNOWN; 1641 sp->encode_meth = (scheme == COMPRESSION_SGILOG24) ? 1642 SGILOGENCODE_RANDITHER : SGILOGENCODE_NODITHER; 1643 sp->tfunc = _logLuvNop; 1644 1645 /* 1646 * Install codec methods. 1647 * NB: tif_decoderow & tif_encoderow are filled 1648 * in at setup time. 1649 */ 1650 tif->tif_fixuptags = LogLuvFixupTags; 1651 tif->tif_setupdecode = LogLuvSetupDecode; 1652 tif->tif_decodestrip = LogLuvDecodeStrip; 1653 tif->tif_decodetile = LogLuvDecodeTile; 1654 tif->tif_setupencode = LogLuvSetupEncode; 1655 tif->tif_encodestrip = LogLuvEncodeStrip; 1656 tif->tif_encodetile = LogLuvEncodeTile; 1657 tif->tif_close = LogLuvClose; 1658 tif->tif_cleanup = LogLuvCleanup; 1659 1660 /* 1661 * Override parent get/set field methods. 1662 */ 1663 sp->vgetparent = tif->tif_tagmethods.vgetfield; 1664 tif->tif_tagmethods.vgetfield = LogLuvVGetField; /* hook for codec tags */ 1665 sp->vsetparent = tif->tif_tagmethods.vsetfield; 1666 tif->tif_tagmethods.vsetfield = LogLuvVSetField; /* hook for codec tags */ 1667 1668 return (1); 1669 bad: 1670 TIFFErrorExt(tif->tif_clientdata, module, 1671 "%s: No space for LogLuv state block", tif->tif_name); 1672 return (0); 1673 } 1674 #endif /* LOGLUV_SUPPORT */ 1675 1676 /* vim: set ts=8 sts=8 sw=8 noet: */ 1677 /* 1678 * Local Variables: 1679 * mode: c 1680 * c-basic-offset: 8 1681 * fill-column: 78 1682 * End: 1683 */ 1684
