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