1/* PDFlib GmbH cvsid: $Id: tif_luv.c 14574 2005-10-29 16:27:43Z bonefish $ */ 2/* 3 * Copyright (c) 1997 Greg Ward Larson 4 * Copyright (c) 1997 Silicon Graphics, Inc. 5 * 6 * Permission to use, copy, modify, distribute, and sell this software and 7 * its documentation for any purpose is hereby granted without fee, provided 8 * that (i) the above copyright notices and this permission notice appear in 9 * all copies of the software and related documentation, and (ii) the names of 10 * Sam Leffler, Greg Larson and Silicon Graphics may not be used in any 11 * advertising or publicity relating to the software without the specific, 12 * prior written permission of Sam Leffler, Greg Larson and Silicon Graphics. 13 * 14 * THE SOFTWARE IS PROVIDED "AS-IS" AND WITHOUT WARRANTY OF ANY KIND, 15 * EXPRESS, IMPLIED OR OTHERWISE, INCLUDING WITHOUT LIMITATION, ANY 16 * WARRANTY OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE. 17 * 18 * IN NO EVENT SHALL SAM LEFFLER, GREG LARSON OR SILICON GRAPHICS BE LIABLE 19 * FOR ANY SPECIAL, INCIDENTAL, INDIRECT OR CONSEQUENTIAL DAMAGES OF ANY KIND, 20 * OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, 21 * WHETHER OR NOT ADVISED OF THE POSSIBILITY OF DAMAGE, AND ON ANY THEORY OF 22 * LIABILITY, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE 23 * OF THIS SOFTWARE. 24 */ 25 26#include "tiffiop.h" 27#ifdef LOGLUV_SUPPORT 28 29/* 30 * TIFF Library. 31 * LogLuv compression support for high dynamic range images. 32 * 33 * Contributed by Greg Larson. 34 * 35 * LogLuv image support uses the TIFF library to store 16 or 10-bit 36 * log luminance values with 8 bits each of u and v or a 14-bit index. 37 * 38 * The codec can take as input and produce as output 32-bit IEEE float values 39 * as well as 16-bit integer values. A 16-bit luminance is interpreted 40 * as a sign bit followed by a 15-bit integer that is converted 41 * to and from a linear magnitude using the transformation: 42 * 43 * L = 2^( (Le+.5)/256 - 64 ) # real from 15-bit 44 * 45 * Le = floor( 256*(log2(L) + 64) ) # 15-bit from real 46 * 47 * The actual conversion to world luminance units in candelas per sq. meter 48 * requires an additional multiplier, which is stored in the TIFFTAG_STONITS. 49 * This value is usually set such that a reasonable exposure comes from 50 * clamping decoded luminances above 1 to 1 in the displayed image. 51 * 52 * The 16-bit values for u and v may be converted to real values by dividing 53 * each by 32768. (This allows for negative values, which aren't useful as 54 * far as we know, but are left in case of future improvements in human 55 * color vision.) 56 * 57 * Conversion from (u,v), which is actually the CIE (u',v') system for 58 * you color scientists, is accomplished by the following transformation: 59 * 60 * u = 4*x / (-2*x + 12*y + 3) 61 * v = 9*y / (-2*x + 12*y + 3) 62 * 63 * x = 9*u / (6*u - 16*v + 12) 64 * y = 4*v / (6*u - 16*v + 12) 65 * 66 * This process is greatly simplified by passing 32-bit IEEE floats 67 * for each of three CIE XYZ coordinates. The codec then takes care 68 * of conversion to and from LogLuv, though the application is still 69 * responsible for interpreting the TIFFTAG_STONITS calibration factor. 70 * 71 * By definition, a CIE XYZ vector of [1 1 1] corresponds to a neutral white 72 * point of (x,y)=(1/3,1/3). However, most color systems assume some other 73 * white point, such as D65, and an absolute color conversion to XYZ then 74 * to another color space with a different white point may introduce an 75 * unwanted color cast to the image. It is often desirable, therefore, to 76 * perform a white point conversion that maps the input white to [1 1 1] 77 * in XYZ, then record the original white point using the TIFFTAG_WHITEPOINT 78 * tag value. A decoder that demands absolute color calibration may use 79 * this white point tag to get back the original colors, but usually it 80 * will be ignored and the new white point will be used instead that 81 * matches the output color space. 82 * 83 * Pixel information is compressed into one of two basic encodings, depending 84 * on the setting of the compression tag, which is one of COMPRESSION_SGILOG 85 * or COMPRESSION_SGILOG24. For COMPRESSION_SGILOG, greyscale data is 86 * stored as: 87 * 88 * 1 15 89 * |-+---------------| 90 * 91 * COMPRESSION_SGILOG color data is stored as: 92 * 93 * 1 15 8 8 94 * |-+---------------|--------+--------| 95 * S Le ue ve 96 * 97 * For the 24-bit COMPRESSION_SGILOG24 color format, the data is stored as: 98 * 99 * 10 14 100 * |----------|--------------| 101 * Le' Ce 102 * 103 * There is no sign bit in the 24-bit case, and the (u,v) chromaticity is 104 * encoded as an index for optimal color resolution. The 10 log bits are 105 * defined by the following conversions: 106 * 107 * L = 2^((Le'+.5)/64 - 12) # real from 10-bit 108 * 109 * Le' = floor( 64*(log2(L) + 12) ) # 10-bit from real 110 * 111 * The 10 bits of the smaller format may be converted into the 15 bits of 112 * the larger format by multiplying by 4 and adding 13314. Obviously, 113 * a smaller range of magnitudes is covered (about 5 orders of magnitude 114 * instead of 38), and the lack of a sign bit means that negative luminances 115 * are not allowed. (Well, they aren't allowed in the real world, either, 116 * but they are useful for certain types of image processing.) 117 * 118 * The desired user format is controlled by the setting the internal 119 * pseudo tag TIFFTAG_SGILOGDATAFMT to one of: 120 * SGILOGDATAFMT_FLOAT = IEEE 32-bit float XYZ values 121 * SGILOGDATAFMT_16BIT = 16-bit integer encodings of logL, u and v 122 * Raw data i/o is also possible using: 123 * SGILOGDATAFMT_RAW = 32-bit unsigned integer with encoded pixel 124 * In addition, the following decoding is provided for ease of display: 125 * SGILOGDATAFMT_8BIT = 8-bit default RGB gamma-corrected values 126 * 127 * For grayscale images, we provide the following data formats: 128 * SGILOGDATAFMT_FLOAT = IEEE 32-bit float Y values 129 * SGILOGDATAFMT_16BIT = 16-bit integer w/ encoded luminance 130 * SGILOGDATAFMT_8BIT = 8-bit gray monitor values 131 * 132 * Note that the COMPRESSION_SGILOG applies a simple run-length encoding 133 * scheme by separating the logL, u and v bytes for each row and applying 134 * a PackBits type of compression. Since the 24-bit encoding is not 135 * adaptive, the 32-bit color format takes less space in many cases. 136 * 137 * Further control is provided over the conversion from higher-resolution 138 * formats to final encoded values through the pseudo tag 139 * TIFFTAG_SGILOGENCODE: 140 * SGILOGENCODE_NODITHER = do not dither encoded values 141 * SGILOGENCODE_RANDITHER = apply random dithering during encoding 142 * 143 * The default value of this tag is SGILOGENCODE_NODITHER for 144 * COMPRESSION_SGILOG to maximize run-length encoding and 145 * SGILOGENCODE_RANDITHER for COMPRESSION_SGILOG24 to turn 146 * quantization errors into noise. 147 */ 148 149#include <stdio.h> 150#include <assert.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 */ 158typedef struct logLuvState LogLuvState; 159 160struct logLuvState { 161 int user_datafmt; /* user data format */ 162 int encode_meth; /* encoding method */ 163 int pixel_size; /* bytes per pixel */ 164 165 tidata_t* tbuf; /* translation buffer */ 166 int tbuflen; /* buffer length */ 167 void (*tfunc)(LogLuvState*, tidata_t, int); 168 169 TIFFVSetMethod vgetparent; /* super-class method */ 170 TIFFVSetMethod vsetparent; /* super-class method */ 171}; 172 173#define DecoderState(tif) ((LogLuvState*) (tif)->tif_data) 174#ifdef PDFLIB_TIFFWRITE_SUPPORT 175#define EncoderState(tif) ((LogLuvState*) (tif)->tif_data) 176#endif /* PDFLIB_TIFFWRITE_SUPPORT */ 177 178#define N(a) (sizeof(a)/sizeof(a[0])) 179#define SGILOGDATAFMT_UNKNOWN -1 180 181#define MINRUN 4 /* minimum run length */ 182 183/* 184 * Decode a string of 16-bit gray pixels. 185 */ 186static int 187LogL16Decode(TIFF* tif, tidata_t op, tsize_t occ, tsample_t s) 188{ 189 LogLuvState* sp = DecoderState(tif); 190 int shft, i, npixels; 191 tif_char* bp; 192 int16* tp; 193 int16 b; 194 int cc, rc; 195 196 assert(s == 0); 197 assert(sp != NULL); 198 199 npixels = occ / sp->pixel_size; 200 201 if (sp->user_datafmt == SGILOGDATAFMT_16BIT) 202 tp = (int16*) op; 203 else { 204 assert(sp->tbuflen >= npixels); 205 tp = (int16*) sp->tbuf; 206 } 207 _TIFFmemset((tdata_t) tp, 0, npixels*sizeof (tp[0])); 208 209 bp = (tif_char*) tif->tif_rawcp; 210 cc = tif->tif_rawcc; 211 /* get each byte string */ 212 for (shft = 2*8; (shft -= 8) >= 0; ) { 213 for (i = 0; i < npixels && cc > 0; ) 214 if (*bp >= 128) { /* run */ 215 rc = *bp++ + (2-128); 216 b = (int16)*bp++ << shft; 217 cc -= 2; 218 while (rc--) 219 tp[i++] |= b; 220 } else { /* non-run */ 221 rc = *bp++; /* nul is noop */ 222 while (--cc && rc--) 223 tp[i++] |= (int16)*bp++ << shft; 224 } 225 if (i != npixels) { 226 TIFFError(tif->tif_name, 227 "LogL16Decode: Not enough data at row %d (short %d pixels)", 228 tif->tif_row, npixels - i); 229 tif->tif_rawcp = (tidata_t) bp; 230 tif->tif_rawcc = cc; 231 return (0); 232 } 233 } 234 (*sp->tfunc)(sp, op, npixels); 235 tif->tif_rawcp = (tidata_t) bp; 236 tif->tif_rawcc = cc; 237 return (1); 238} 239 240/* 241 * Decode a string of 24-bit pixels. 242 */ 243static int 244LogLuvDecode24(TIFF* tif, tidata_t op, tsize_t occ, tsample_t s) 245{ 246 LogLuvState* sp = DecoderState(tif); 247 int cc, i, npixels; 248 tif_char* bp; 249 uint32* tp; 250 251 assert(s == 0); 252 assert(sp != NULL); 253 254 npixels = occ / sp->pixel_size; 255 256 if (sp->user_datafmt == SGILOGDATAFMT_RAW) 257 tp = (uint32 *)op; 258 else { 259 assert(sp->tbuflen >= npixels); 260 tp = (uint32 *) sp->tbuf; 261 } 262 /* copy to array of uint32 */ 263 bp = (tif_char*) tif->tif_rawcp; 264 cc = tif->tif_rawcc; 265 for (i = 0; i < npixels && cc > 0; i++) { 266 tp[i] = bp[0] << 16 | bp[1] << 8 | bp[2]; 267 bp += 3; 268 cc -= 3; 269 } 270 tif->tif_rawcp = (tidata_t) bp; 271 tif->tif_rawcc = cc; 272 if (i != npixels) { 273 TIFFError(tif->tif_name, 274 "LogLuvDecode24: Not enough data at row %d (short %d pixels)", 275 tif->tif_row, npixels - i); 276 return (0); 277 } 278 (*sp->tfunc)(sp, op, npixels); 279 return (1); 280} 281 282/* 283 * Decode a string of 32-bit pixels. 284 */ 285static int 286LogLuvDecode32(TIFF* tif, tidata_t op, tsize_t occ, tsample_t s) 287{ 288 LogLuvState* sp; 289 int shft, i, npixels; 290 tif_char* bp; 291 uint32* tp; 292 uint32 b; 293 int cc, rc; 294 295 assert(s == 0); 296 sp = DecoderState(tif); 297 assert(sp != NULL); 298 299 npixels = occ / sp->pixel_size; 300 301 if (sp->user_datafmt == SGILOGDATAFMT_RAW) 302 tp = (uint32*) op; 303 else { 304 assert(sp->tbuflen >= npixels); 305 tp = (uint32*) sp->tbuf; 306 } 307 _TIFFmemset((tdata_t) tp, 0, npixels*sizeof (tp[0])); 308 309 bp = (tif_char*) tif->tif_rawcp; 310 cc = tif->tif_rawcc; 311 /* get each byte string */ 312 for (shft = 4*8; (shft -= 8) >= 0; ) { 313 for (i = 0; i < npixels && cc > 0; ) 314 if (*bp >= 128) { /* run */ 315 rc = *bp++ + (2-128); 316 b = (uint32)*bp++ << shft; 317 cc -= 2; 318 while (rc--) 319 tp[i++] |= b; 320 } else { /* non-run */ 321 rc = *bp++; /* nul is noop */ 322 while (--cc && rc--) 323 tp[i++] |= (uint32)*bp++ << shft; 324 } 325 if (i != npixels) { 326 TIFFError(tif->tif_name, 327 "LogLuvDecode32: Not enough data at row %d (short %d pixels)", 328 tif->tif_row, npixels - i); 329 tif->tif_rawcp = (tidata_t) bp; 330 tif->tif_rawcc = cc; 331 return (0); 332 } 333 } 334 (*sp->tfunc)(sp, op, npixels); 335 tif->tif_rawcp = (tidata_t) bp; 336 tif->tif_rawcc = cc; 337 return (1); 338} 339 340/* 341 * Decode a strip of pixels. We break it into rows to 342 * maintain synchrony with the encode algorithm, which 343 * is row by row. 344 */ 345static int 346LogLuvDecodeStrip(TIFF* tif, tidata_t bp, tsize_t cc, tsample_t s) 347{ 348 tsize_t rowlen = TIFFScanlineSize(tif); 349 350 assert(cc%rowlen == 0); 351 while (cc && (*tif->tif_decoderow)(tif, bp, rowlen, s)) 352 bp += rowlen, cc -= rowlen; 353 return (cc == 0); 354} 355 356/* 357 * Decode a tile of pixels. We break it into rows to 358 * maintain synchrony with the encode algorithm, which 359 * is row by row. 360 */ 361static int 362LogLuvDecodeTile(TIFF* tif, tidata_t bp, tsize_t cc, tsample_t s) 363{ 364 tsize_t rowlen = TIFFTileRowSize(tif); 365 366 assert(cc%rowlen == 0); 367 while (cc && (*tif->tif_decoderow)(tif, bp, rowlen, s)) 368 bp += rowlen, cc -= rowlen; 369 return (cc == 0); 370} 371 372/* 373 * Encode a row of 16-bit pixels. 374 */ 375#ifdef PDFLIB_TIFFWRITE_SUPPORT 376static int 377LogL16Encode(TIFF* tif, tidata_t bp, tsize_t cc, tsample_t s) 378{ 379 LogLuvState* sp = EncoderState(tif); 380 int shft, i, j, npixels; 381 tidata_t op; 382 int16* tp; 383 int16 b; 384 int occ, rc=0, mask, beg; 385 386 assert(s == 0); 387 assert(sp != NULL); 388 npixels = cc / sp->pixel_size; 389 390 if (sp->user_datafmt == SGILOGDATAFMT_16BIT) 391 tp = (int16*) bp; 392 else { 393 tp = (int16*) sp->tbuf; 394 assert(sp->tbuflen >= npixels); 395 (*sp->tfunc)(sp, bp, npixels); 396 } 397 /* compress each byte string */ 398 op = tif->tif_rawcp; 399 occ = tif->tif_rawdatasize - tif->tif_rawcc; 400 for (shft = 2*8; (shft -= 8) >= 0; ) 401 for (i = 0; i < npixels; i += rc) { 402 if (occ < 4) { 403 tif->tif_rawcp = op; 404 tif->tif_rawcc = tif->tif_rawdatasize - occ; 405 if (!TIFFFlushData1(tif)) 406 return (-1); 407 op = tif->tif_rawcp; 408 occ = tif->tif_rawdatasize - tif->tif_rawcc; 409 } 410 mask = 0xff << shft; /* find next run */ 411 for (beg = i; beg < npixels; beg += rc) { 412 b = tp[beg] & mask; 413 rc = 1; 414 while (rc < 127+2 && beg+rc < npixels && 415 (tp[beg+rc] & mask) == b) 416 rc++; 417 if (rc >= MINRUN) 418 break; /* long enough */ 419 } 420 if (beg-i > 1 && beg-i < MINRUN) { 421 b = tp[i] & mask; /* check short run */ 422 j = i+1; 423 while ((tp[j++] & mask) == b) 424 if (j == beg) { 425 *op++ = 128-2+j-i; 426 *op++ = b >> shft; 427 occ -= 2; 428 i = beg; 429 break; 430 } 431 } 432 while (i < beg) { /* write out non-run */ 433 if ((j = beg-i) > 127) j = 127; 434 if (occ < j+3) { 435 tif->tif_rawcp = op; 436 tif->tif_rawcc = tif->tif_rawdatasize 437 - occ; 438 if (!TIFFFlushData1(tif)) 439 return (-1); 440 op = tif->tif_rawcp; 441 occ = tif->tif_rawdatasize 442 - tif->tif_rawcc; 443 } 444 *op++ = j; occ--; 445 while (j--) { 446 *op++ = tp[i++] >> shft & 0xff; 447 occ--; 448 } 449 } 450 if (rc >= MINRUN) { /* write out run */ 451 *op++ = 128-2+rc; 452 *op++ = tp[beg] >> shft & 0xff; 453 occ -= 2; 454 } else 455 rc = 0; 456 } 457 tif->tif_rawcp = op; 458 tif->tif_rawcc = tif->tif_rawdatasize - occ; 459 460 return (0); 461} 462#endif /* PDFLIB_TIFFWRITE_SUPPORT */ 463 464/* 465 * Encode a row of 24-bit pixels. 466 */ 467#ifdef PDFLIB_TIFFWRITE_SUPPORT 468static int 469LogLuvEncode24(TIFF* tif, tidata_t bp, tsize_t cc, tsample_t s) 470{ 471 LogLuvState* sp = EncoderState(tif); 472 int i, npixels, occ; 473 tidata_t op; 474 uint32* tp; 475 476 assert(s == 0); 477 assert(sp != NULL); 478 npixels = cc / sp->pixel_size; 479 480 if (sp->user_datafmt == SGILOGDATAFMT_RAW) 481 tp = (uint32*) bp; 482 else { 483 tp = (uint32*) sp->tbuf; 484 assert(sp->tbuflen >= npixels); 485 (*sp->tfunc)(sp, bp, npixels); 486 } 487 /* write out encoded pixels */ 488 op = tif->tif_rawcp; 489 occ = tif->tif_rawdatasize - tif->tif_rawcc; 490 for (i = npixels; i--; ) { 491 if (occ < 3) { 492 tif->tif_rawcp = op; 493 tif->tif_rawcc = tif->tif_rawdatasize - occ; 494 if (!TIFFFlushData1(tif)) 495 return (-1); 496 op = tif->tif_rawcp; 497 occ = tif->tif_rawdatasize - tif->tif_rawcc; 498 } 499 *op++ = (tidataval_t)(*tp >> 16); 500 *op++ = (tidataval_t)(*tp >> 8 & 0xff); 501 *op++ = (tidataval_t)(*tp++ & 0xff); 502 occ -= 3; 503 } 504 tif->tif_rawcp = op; 505 tif->tif_rawcc = tif->tif_rawdatasize - occ; 506 507 return (0); 508} 509#endif /* PDFLIB_TIFFWRITE_SUPPORT */ 510 511/* 512 * Encode a row of 32-bit pixels. 513 */ 514#ifdef PDFLIB_TIFFWRITE_SUPPORT 515static int 516LogLuvEncode32(TIFF* tif, tidata_t bp, tsize_t cc, tsample_t s) 517{ 518 LogLuvState* sp = EncoderState(tif); 519 int shft, i, j, npixels; 520 tidata_t op; 521 uint32* tp; 522 uint32 b; 523 int occ, rc=0, mask, beg; 524 525 assert(s == 0); 526 assert(sp != NULL); 527 528 npixels = cc / sp->pixel_size; 529 530 if (sp->user_datafmt == SGILOGDATAFMT_RAW) 531 tp = (uint32*) bp; 532 else { 533 tp = (uint32*) sp->tbuf; 534 assert(sp->tbuflen >= npixels); 535 (*sp->tfunc)(sp, bp, npixels); 536 } 537 /* compress each byte string */ 538 op = tif->tif_rawcp; 539 occ = tif->tif_rawdatasize - tif->tif_rawcc; 540 for (shft = 4*8; (shft -= 8) >= 0; ) 541 for (i = 0; i < npixels; i += rc) { 542 if (occ < 4) { 543 tif->tif_rawcp = op; 544 tif->tif_rawcc = tif->tif_rawdatasize - occ; 545 if (!TIFFFlushData1(tif)) 546 return (-1); 547 op = tif->tif_rawcp; 548 occ = tif->tif_rawdatasize - tif->tif_rawcc; 549 } 550 mask = 0xff << shft; /* find next run */ 551 for (beg = i; beg < npixels; beg += rc) { 552 b = tp[beg] & mask; 553 rc = 1; 554 while (rc < 127+2 && beg+rc < npixels && 555 (tp[beg+rc] & mask) == b) 556 rc++; 557 if (rc >= MINRUN) 558 break; /* long enough */ 559 } 560 if (beg-i > 1 && beg-i < MINRUN) { 561 b = tp[i] & mask; /* check short run */ 562 j = i+1; 563 while ((tp[j++] & mask) == b) 564 if (j == beg) { 565 *op++ =(tidataval_t)(128-2+j-i); 566 *op++ =(tidataval_t)(b >> shft); 567 occ -= 2; 568 i = beg; 569 break; 570 } 571 } 572 while (i < beg) { /* write out non-run */ 573 if ((j = beg-i) > 127) j = 127; 574 if (occ < j+3) { 575 tif->tif_rawcp = op; 576 tif->tif_rawcc = tif->tif_rawdatasize 577 - occ; 578 if (!TIFFFlushData1(tif)) 579 return (-1); 580 op = tif->tif_rawcp; 581 occ = tif->tif_rawdatasize 582 - tif->tif_rawcc; 583 } 584 *op++ = j; occ--; 585 while (j--) { 586 *op++ = (tidataval_t)(tp[i++] >> shft 587 & 0xff); 588 occ--; 589 } 590 } 591 if (rc >= MINRUN) { /* write out run */ 592 *op++ = 128-2+rc; 593 *op++ = (tidataval_t)(tp[beg] >> shft & 0xff); 594 occ -= 2; 595 } else 596 rc = 0; 597 } 598 tif->tif_rawcp = op; 599 tif->tif_rawcc = tif->tif_rawdatasize - occ; 600 601 return (0); 602} 603#endif /* PDFLIB_TIFFWRITE_SUPPORT */ 604 605/* 606 * Encode a strip of pixels. We break it into rows to 607 * avoid encoding runs across row boundaries. 608 */ 609#ifdef PDFLIB_TIFFWRITE_SUPPORT 610static int 611LogLuvEncodeStrip(TIFF* tif, tidata_t bp, tsize_t cc, tsample_t s) 612{ 613 tsize_t rowlen = TIFFScanlineSize(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#endif /* PDFLIB_TIFFWRITE_SUPPORT */ 621 622/* 623 * Encode a tile of pixels. We break it into rows to 624 * avoid encoding runs across row boundaries. 625 */ 626#ifdef PDFLIB_TIFFWRITE_SUPPORT 627static int 628LogLuvEncodeTile(TIFF* tif, tidata_t bp, tsize_t cc, tsample_t s) 629{ 630 tsize_t rowlen = TIFFTileRowSize(tif); 631 632 assert(cc%rowlen == 0); 633 while (cc && (*tif->tif_encoderow)(tif, bp, rowlen, s) == 0) 634 bp += rowlen, cc -= rowlen; 635 return (cc == 0); 636} 637#endif /* PDFLIB_TIFFWRITE_SUPPORT */ 638 639/* 640 * Encode/Decode functions for converting to and from user formats. 641 */ 642 643#include "uvcode.h" 644 645#ifndef UVSCALE 646#define U_NEU 0.210526316 647#define V_NEU 0.473684211 648#define UVSCALE 410. 649#endif 650 651#ifndef M_LN2 652#define M_LN2 0.69314718055994530942 653#endif 654#ifndef M_PI 655#define M_PI 3.14159265358979323846 656#endif 657#define log2(x) ((1./M_LN2)*log(x)) 658#define exp2(x) exp(M_LN2*(x)) 659 660#define itrunc(x,m) ((m)==SGILOGENCODE_NODITHER ? \ 661 (int)(x) : \ 662 (int)((x) + rand()*(1./RAND_MAX) - .5)) 663 664#if !LOGLUV_PUBLIC 665static 666#endif 667double 668LogL16toY(int p16) /* compute luminance from 16-bit LogL */ 669{ 670 int Le = p16 & 0x7fff; 671 double Y; 672 673 if (!Le) 674 return (0.); 675 Y = exp(M_LN2/256.*(Le+.5) - M_LN2*64.); 676 return (!(p16 & 0x8000) ? Y : -Y); 677} 678 679#ifdef PDFLIB_TIFFWRITE_SUPPORT 680#if !LOGLUV_PUBLIC 681static 682#endif 683int 684LogL16fromY(double Y, int em) /* get 16-bit LogL from Y */ 685{ 686 if (Y >= 1.8371976e19) 687 return (0x7fff); 688 if (Y <= -1.8371976e19) 689 return (0xffff); 690 if (Y > 5.4136769e-20) 691 return itrunc(256.*(log2(Y) + 64.), em); 692 if (Y < -5.4136769e-20) 693 return (~0x7fff | itrunc(256.*(log2(-Y) + 64.), em)); 694 return (0); 695} 696#endif /* PDFLIB_TIFFWRITE_SUPPORT */ 697 698static void 699L16toY(LogLuvState* sp, tidata_t op, int n) 700{ 701 int16* l16 = (int16*) sp->tbuf; 702 float* yp = (float*) op; 703 704 while (n-- > 0) 705 *yp++ = (float)LogL16toY(*l16++); 706} 707 708static void 709L16toGry(LogLuvState* sp, tidata_t op, int n) 710{ 711 int16* l16 = (int16*) sp->tbuf; 712 uint8* gp = (uint8*) op; 713 714 while (n-- > 0) { 715 double Y = LogL16toY(*l16++); 716 *gp++ = (Y <= 0.) ? 0 : (Y >= 1.) ? 255 : (int)(256.*sqrt(Y)); 717 } 718} 719 720#ifdef PDFLIB_TIFFWRITE_SUPPORT 721static void 722L16fromY(LogLuvState* sp, tidata_t op, int n) 723{ 724 int16* l16 = (int16*) sp->tbuf; 725 float* yp = (float*) op; 726 727 while (n-- > 0) 728 *l16++ = LogL16fromY(*yp++, sp->encode_meth); 729} 730#endif /* PDFLIB_TIFFWRITE_SUPPORT */ 731 732#if !LOGLUV_PUBLIC 733static 734#endif 735void 736XYZtoRGB24(float xyz[3], uint8 rgb[3]) 737{ 738 double r, g, b; 739 /* assume CCIR-709 primaries */ 740 r = 2.690*xyz[0] + -1.276*xyz[1] + -0.414*xyz[2]; 741 g = -1.022*xyz[0] + 1.978*xyz[1] + 0.044*xyz[2]; 742 b = 0.061*xyz[0] + -0.224*xyz[1] + 1.163*xyz[2]; 743 /* assume 2.0 gamma for speed */ 744 /* could use integer sqrt approx., but this is probably faster */ 745 rgb[0] = (r <= 0.) ? 0 : (r >= 1.) ? 255 : (int)(256.*sqrt(r)); 746 rgb[1] = (g <= 0.) ? 0 : (g >= 1.) ? 255 : (int)(256.*sqrt(g)); 747 rgb[2] = (b <= 0.) ? 0 : (b >= 1.) ? 255 : (int)(256.*sqrt(b)); 748} 749 750#if !LOGLUV_PUBLIC 751static 752#endif 753double 754LogL10toY(int p10) /* compute luminance from 10-bit LogL */ 755{ 756 if (p10 == 0) 757 return (0.); 758 return (exp(M_LN2/64.*(p10+.5) - M_LN2*12.)); 759} 760 761#if !LOGLUV_PUBLIC 762static 763#endif 764int 765LogL10fromY(double Y, int em) /* get 10-bit LogL from Y */ 766{ 767 if (Y >= 15.742) 768 return (0x3ff); 769 else if (Y <= .00024283) 770 return (0); 771 else 772 return itrunc(64.*(log2(Y) + 12.), em); 773} 774 775#define NANGLES 100 776#define uv2ang(u, v) ( (NANGLES*.499999999/M_PI) \ 777 * atan2((v)-V_NEU,(u)-U_NEU) + .5*NANGLES ) 778 779static int 780oog_encode(double u, double v) /* encode out-of-gamut chroma */ 781{ 782 static int oog_table[NANGLES]; 783 static int initialized = 0; 784 register int i; 785 786 if (!initialized) { /* set up perimeter table */ 787 double eps[NANGLES], ua, va, ang, epsa; 788 int ui, vi, ustep; 789 for (i = NANGLES; i--; ) 790 eps[i] = 2.; 791 for (vi = UV_NVS; vi--; ) { 792 va = UV_VSTART + (vi+.5)*UV_SQSIZ; 793 ustep = uv_row[vi].nus-1; 794 if (vi == UV_NVS-1 || vi == 0 || ustep <= 0) 795 ustep = 1; 796 for (ui = uv_row[vi].nus-1; ui >= 0; ui -= ustep) { 797 ua = uv_row[vi].ustart + (ui+.5)*UV_SQSIZ; 798 ang = uv2ang(ua, va); 799 i = (int) ang; 800 epsa = fabs(ang - (i+.5)); 801 if (epsa < eps[i]) { 802 oog_table[i] = uv_row[vi].ncum + ui; 803 eps[i] = epsa; 804 } 805 } 806 } 807 for (i = NANGLES; i--; ) /* fill any holes */ 808 if (eps[i] > 1.5) { 809 int i1, i2; 810 for (i1 = 1; i1 < NANGLES/2; i1++) 811 if (eps[(i+i1)%NANGLES] < 1.5) 812 break; 813 for (i2 = 1; i2 < NANGLES/2; i2++) 814 if (eps[(i+NANGLES-i2)%NANGLES] < 1.5) 815 break; 816 if (i1 < i2) 817 oog_table[i] = 818 oog_table[(i+i1)%NANGLES]; 819 else 820 oog_table[i] = 821 oog_table[(i+NANGLES-i2)%NANGLES]; 822 } 823 initialized = 1; 824 } 825 i = (int) uv2ang(u, v); /* look up hue angle */ 826 return (oog_table[i]); 827} 828 829#undef uv2ang 830#undef NANGLES 831 832#if !LOGLUV_PUBLIC 833static 834#endif 835int 836uv_encode(double u, double v, int em) /* encode (u',v') coordinates */ 837{ 838 register int vi, ui; 839 840 if (v < UV_VSTART) 841 return oog_encode(u, v); 842 vi = itrunc((v - UV_VSTART)*(1./UV_SQSIZ), em); 843 if (vi >= UV_NVS) 844 return oog_encode(u, v); 845 if (u < uv_row[vi].ustart) 846 return oog_encode(u, v); 847 ui = itrunc((u - uv_row[vi].ustart)*(1./UV_SQSIZ), em); 848 if (ui >= uv_row[vi].nus) 849 return oog_encode(u, v); 850 851 return (uv_row[vi].ncum + ui); 852} 853 854#if !LOGLUV_PUBLIC 855static 856#endif 857int 858uv_decode(double *up, double *vp, int c) /* decode (u',v') index */ 859{ 860 int upper, lower; 861 register int ui, vi; 862 863 if (c < 0 || c >= UV_NDIVS) 864 return (-1); 865 lower = 0; /* binary search */ 866 upper = UV_NVS; 867 while (upper - lower > 1) { 868 vi = (lower + upper) >> 1; 869 ui = c - uv_row[vi].ncum; 870 if (ui > 0) 871 lower = vi; 872 else if (ui < 0) 873 upper = vi; 874 else { 875 lower = vi; 876 break; 877 } 878 } 879 vi = lower; 880 ui = c - uv_row[vi].ncum; 881 *up = uv_row[vi].ustart + (ui+.5)*UV_SQSIZ; 882 *vp = UV_VSTART + (vi+.5)*UV_SQSIZ; 883 return (0); 884} 885 886#if !LOGLUV_PUBLIC 887static 888#endif 889void 890LogLuv24toXYZ(uint32 p, float XYZ[3]) 891{ 892 int Ce; 893 double L, u, v, s, x, y; 894 /* decode luminance */ 895 L = LogL10toY(p>>14 & 0x3ff); 896 if (L <= 0.) { 897 XYZ[0] = XYZ[1] = XYZ[2] = 0.; 898 return; 899 } 900 /* decode color */ 901 Ce = p & 0x3fff; 902 if (uv_decode(&u, &v, Ce) < 0) { 903 u = U_NEU; v = V_NEU; 904 } 905 s = 1./(6.*u - 16.*v + 12.); 906 x = 9.*u * s; 907 y = 4.*v * s; 908 /* convert to XYZ */ 909 XYZ[0] = (float)(x/y * L); 910 XYZ[1] = (float)L; 911 XYZ[2] = (float)((1.-x-y)/y * L); 912} 913 914#ifdef PDFLIB_TIFFWRITE_SUPPORT 915#if !LOGLUV_PUBLIC 916static 917#endif 918uint32 919LogLuv24fromXYZ(float XYZ[3], int em) 920{ 921 int Le, Ce; 922 double u, v, s; 923 /* encode luminance */ 924 Le = LogL10fromY(XYZ[1], em); 925 /* encode color */ 926 s = XYZ[0] + 15.*XYZ[1] + 3.*XYZ[2]; 927 if (!Le || s <= 0.) { 928 u = U_NEU; 929 v = V_NEU; 930 } else { 931 u = 4.*XYZ[0] / s; 932 v = 9.*XYZ[1] / s; 933 } 934 Ce = uv_encode(u, v, em); 935 if (Ce < 0) /* never happens */ 936 Ce = uv_encode(U_NEU, V_NEU, SGILOGENCODE_NODITHER); 937 /* combine encodings */ 938 return (Le << 14 | Ce); 939} 940#endif /* PDFLIB_TIFFWRITE_SUPPORT */ 941 942static void 943Luv24toXYZ(LogLuvState* sp, tidata_t op, int n) 944{ 945 uint32* luv = (uint32*) sp->tbuf; 946 float* xyz = (float*) op; 947 948 while (n-- > 0) { 949 LogLuv24toXYZ(*luv, xyz); 950 xyz += 3; 951 luv++; 952 } 953} 954 955static void 956Luv24toLuv48(LogLuvState* sp, tidata_t op, int n) 957{ 958 uint32* luv = (uint32*) sp->tbuf; 959 int16* luv3 = (int16*) op; 960 961 while (n-- > 0) { 962 double u, v; 963 964 *luv3++ = (int16)((*luv >> 12 & 0xffd) + 13314); 965 if (uv_decode(&u, &v, *luv&0x3fff) < 0) { 966 u = U_NEU; 967 v = V_NEU; 968 } 969 *luv3++ = (int16)(u * (1L<<15)); 970 *luv3++ = (int16)(v * (1L<<15)); 971 luv++; 972 } 973} 974 975static void 976Luv24toRGB(LogLuvState* sp, tidata_t op, int n) 977{ 978 uint32* luv = (uint32*) sp->tbuf; 979 uint8* rgb = (uint8*) op; 980 981 while (n-- > 0) { 982 float xyz[3]; 983 984 LogLuv24toXYZ(*luv++, xyz); 985 XYZtoRGB24(xyz, rgb); 986 rgb += 3; 987 } 988} 989 990#ifdef PDFLIB_TIFFWRITE_SUPPORT 991static void 992Luv24fromXYZ(LogLuvState* sp, tidata_t op, int n) 993{ 994 uint32* luv = (uint32*) sp->tbuf; 995 float* xyz = (float*) op; 996 997 while (n-- > 0) { 998 *luv++ = LogLuv24fromXYZ(xyz, sp->encode_meth); 999 xyz += 3; 1000 } 1001} 1002#endif /* PDFLIB_TIFFWRITE_SUPPORT */ 1003 1004#ifdef PDFLIB_TIFFWRITE_SUPPORT 1005static void 1006Luv24fromLuv48(LogLuvState* sp, tidata_t op, int n) 1007{ 1008 uint32* luv = (uint32*) sp->tbuf; 1009 int16* luv3 = (int16*) op; 1010 1011 while (n-- > 0) { 1012 int Le, Ce; 1013 1014 if (luv3[0] <= 0) 1015 Le = 0; 1016 else if (luv3[0] >= (1<<12)+3314) 1017 Le = (1<<10) - 1; 1018 else if (sp->encode_meth == SGILOGENCODE_NODITHER) 1019 Le = (luv3[0]-3314) >> 2; 1020 else 1021 Le = itrunc(.25*(luv3[0]-3314.), sp->encode_meth); 1022 1023 Ce = uv_encode((luv[1]+.5)/(1<<15), (luv[2]+.5)/(1<<15), 1024 sp->encode_meth); 1025 if (Ce < 0) /* never happens */ 1026 Ce = uv_encode(U_NEU, V_NEU, SGILOGENCODE_NODITHER); 1027 *luv++ = (uint32)Le << 14 | Ce; 1028 luv3 += 3; 1029 } 1030} 1031#endif /* PDFLIB_TIFFWRITE_SUPPORT */ 1032 1033#if !LOGLUV_PUBLIC 1034static 1035#endif 1036void 1037LogLuv32toXYZ(uint32 p, float XYZ[3]) 1038{ 1039 double L, u, v, s, x, y; 1040 /* decode luminance */ 1041 L = LogL16toY((int)p >> 16); 1042 if (L <= 0.) { 1043 XYZ[0] = XYZ[1] = XYZ[2] = 0.; 1044 return; 1045 } 1046 /* decode color */ 1047 u = 1./UVSCALE * ((p>>8 & 0xff) + .5); 1048 v = 1./UVSCALE * ((p & 0xff) + .5); 1049 s = 1./(6.*u - 16.*v + 12.); 1050 x = 9.*u * s; 1051 y = 4.*v * s; 1052 /* convert to XYZ */ 1053 XYZ[0] = (float)(x/y * L); 1054 XYZ[1] = (float)L; 1055 XYZ[2] = (float)((1.-x-y)/y * L); 1056} 1057 1058#ifdef PDFLIB_TIFFWRITE_SUPPORT 1059#if !LOGLUV_PUBLIC 1060static 1061#endif 1062uint32 1063LogLuv32fromXYZ(float XYZ[3], int em) 1064{ 1065 unsigned int Le, ue, ve; 1066 double u, v, s; 1067 /* encode luminance */ 1068 Le = (unsigned int)LogL16fromY(XYZ[1], em); 1069 /* encode color */ 1070 s = XYZ[0] + 15.*XYZ[1] + 3.*XYZ[2]; 1071 if (!Le || s <= 0.) { 1072 u = U_NEU; 1073 v = V_NEU; 1074 } else { 1075 u = 4.*XYZ[0] / s; 1076 v = 9.*XYZ[1] / s; 1077 } 1078 if (u <= 0.) ue = 0; 1079 else ue = itrunc(UVSCALE*u, em); 1080 if (ue > 255) ue = 255; 1081 if (v <= 0.) ve = 0; 1082 else ve = itrunc(UVSCALE*v, em); 1083 if (ve > 255) ve = 255; 1084 /* combine encodings */ 1085 return (Le << 16 | ue << 8 | ve); 1086} 1087#endif /* PDFLIB_TIFFWRITE_SUPPORT */ 1088 1089static void 1090Luv32toXYZ(LogLuvState* sp, tidata_t op, int n) 1091{ 1092 uint32* luv = (uint32*) sp->tbuf; 1093 float* xyz = (float*) op; 1094 1095 while (n-- > 0) { 1096 LogLuv32toXYZ(*luv++, xyz); 1097 xyz += 3; 1098 } 1099} 1100 1101static void 1102Luv32toLuv48(LogLuvState* sp, tidata_t op, int n) 1103{ 1104 uint32* luv = (uint32*) sp->tbuf; 1105 int16* luv3 = (int16*) op; 1106 1107 while (n-- > 0) { 1108 double u, v; 1109 1110 *luv3++ = (int16)(*luv >> 16); 1111 u = 1./UVSCALE * ((*luv>>8 & 0xff) + .5); 1112 v = 1./UVSCALE * ((*luv & 0xff) + .5); 1113 *luv3++ = (int16)(u * (1L<<15)); 1114 *luv3++ = (int16)(v * (1L<<15)); 1115 luv++; 1116 } 1117} 1118 1119static void 1120Luv32toRGB(LogLuvState* sp, tidata_t op, int n) 1121{ 1122 uint32* luv = (uint32*) sp->tbuf; 1123 uint8* rgb = (uint8*) op; 1124 1125 while (n-- > 0) { 1126 float xyz[3]; 1127 1128 LogLuv32toXYZ(*luv++, xyz); 1129 XYZtoRGB24(xyz, rgb); 1130 rgb += 3; 1131 } 1132} 1133 1134#ifdef PDFLIB_TIFFWRITE_SUPPORT 1135static void 1136Luv32fromXYZ(LogLuvState* sp, tidata_t op, int n) 1137{ 1138 uint32* luv = (uint32*) sp->tbuf; 1139 float* xyz = (float*) op; 1140 1141 while (n-- > 0) { 1142 *luv++ = LogLuv32fromXYZ(xyz, sp->encode_meth); 1143 xyz += 3; 1144 } 1145} 1146#endif /* PDFLIB_TIFFWRITE_SUPPORT */ 1147 1148#ifdef PDFLIB_TIFFWRITE_SUPPORT 1149static void 1150Luv32fromLuv48(LogLuvState* sp, tidata_t op, int n) 1151{ 1152 uint32* luv = (uint32*) sp->tbuf; 1153 int16* luv3 = (int16*) op; 1154 1155 if (sp->encode_meth == SGILOGENCODE_NODITHER) { 1156 while (n-- > 0) { 1157 *luv++ = (uint32)luv3[0] << 16 | 1158 (luv3[1]*(uint32)(UVSCALE+.5) >> 7 & 0xff00) | 1159 (luv3[2]*(uint32)(UVSCALE+.5) >> 15 & 0xff); 1160 luv3 += 3; 1161 } 1162 return; 1163 } 1164 while (n-- > 0) { 1165 *luv++ = (uint32)luv3[0] << 16 | 1166 (itrunc(luv3[1]*(UVSCALE/(1<<15)), sp->encode_meth) << 8 & 0xff00) | 1167 (itrunc(luv3[2]*(UVSCALE/(1<<15)), sp->encode_meth) & 0xff); 1168 luv3 += 3; 1169 } 1170} 1171#endif /* PDFLIB_TIFFWRITE_SUPPORT */ 1172 1173static void 1174_logLuvNop(LogLuvState* sp, tidata_t op, int n) 1175{ 1176 (void) sp; (void) op; (void) n; 1177} 1178 1179static int 1180LogL16GuessDataFmt(TIFFDirectory *td) 1181{ 1182#define PACK(s,b,f) (((b)<<6)|((s)<<3)|(f)) 1183 switch (PACK(td->td_samplesperpixel, td->td_bitspersample, 1184 td->td_sampleformat)) { 1185 case PACK(1, 32, SAMPLEFORMAT_IEEEFP): 1186 return (SGILOGDATAFMT_FLOAT); 1187 case PACK(1, 16, SAMPLEFORMAT_VOID): 1188 case PACK(1, 16, SAMPLEFORMAT_INT): 1189 case PACK(1, 16, SAMPLEFORMAT_UINT): 1190 return (SGILOGDATAFMT_16BIT); 1191 case PACK(1, 8, SAMPLEFORMAT_VOID): 1192 case PACK(1, 8, SAMPLEFORMAT_UINT): 1193 return (SGILOGDATAFMT_8BIT); 1194 } 1195#undef PACK 1196 return (SGILOGDATAFMT_UNKNOWN); 1197} 1198 1199static int 1200LogL16InitState(TIFF* tif) 1201{ 1202 TIFFDirectory *td = &tif->tif_dir; 1203 LogLuvState* sp = DecoderState(tif); 1204 static const char module[] = "LogL16InitState"; 1205 1206 assert(sp != NULL); 1207 assert(td->td_photometric == PHOTOMETRIC_LOGL); 1208 1209 /* for some reason, we can't do this in TIFFInitLogL16 */ 1210 if (sp->user_datafmt == SGILOGDATAFMT_UNKNOWN) 1211 sp->user_datafmt = LogL16GuessDataFmt(td); 1212 switch (sp->user_datafmt) { 1213 case SGILOGDATAFMT_FLOAT: 1214 sp->pixel_size = sizeof (float); 1215 break; 1216 case SGILOGDATAFMT_16BIT: 1217 sp->pixel_size = sizeof (int16); 1218 break; 1219 case SGILOGDATAFMT_8BIT: 1220 sp->pixel_size = sizeof (uint8); 1221 break; 1222 default: 1223 TIFFError(tif->tif_name, 1224 "No support for converting user data format to LogL"); 1225 return (0); 1226 } 1227 sp->tbuflen = td->td_imagewidth * td->td_rowsperstrip; 1228 sp->tbuf = (tidata_t*) _TIFFmalloc(tif, sp->tbuflen * sizeof (int16)); 1229 if (sp->tbuf == NULL) { 1230 TIFFError(module, "%s: No space for SGILog translation buffer", 1231 tif->tif_name); 1232 return (0); 1233 } 1234 return (1); 1235} 1236 1237static int 1238LogLuvGuessDataFmt(TIFFDirectory *td) 1239{ 1240 int guess; 1241 1242 /* 1243 * If the user didn't tell us their datafmt, 1244 * take our best guess from the bitspersample. 1245 */ 1246#define PACK(a,b) (((a)<<3)|(b)) 1247 switch (PACK(td->td_bitspersample, td->td_sampleformat)) { 1248 case PACK(32, SAMPLEFORMAT_IEEEFP): 1249 guess = SGILOGDATAFMT_FLOAT; 1250 break; 1251 case PACK(32, SAMPLEFORMAT_VOID): 1252 case PACK(32, SAMPLEFORMAT_UINT): 1253 case PACK(32, SAMPLEFORMAT_INT): 1254 guess = SGILOGDATAFMT_RAW; 1255 break; 1256 case PACK(16, SAMPLEFORMAT_VOID): 1257 case PACK(16, SAMPLEFORMAT_INT): 1258 case PACK(16, SAMPLEFORMAT_UINT): 1259 guess = SGILOGDATAFMT_16BIT; 1260 break; 1261 case PACK( 8, SAMPLEFORMAT_VOID): 1262 case PACK( 8, SAMPLEFORMAT_UINT): 1263 guess = SGILOGDATAFMT_8BIT; 1264 break; 1265 default: 1266 guess = SGILOGDATAFMT_UNKNOWN; 1267 break; 1268#undef PACK 1269 } 1270 /* 1271 * Double-check samples per pixel. 1272 */ 1273 switch (td->td_samplesperpixel) { 1274 case 1: 1275 if (guess != SGILOGDATAFMT_RAW) 1276 guess = SGILOGDATAFMT_UNKNOWN; 1277 break; 1278 case 3: 1279 if (guess == SGILOGDATAFMT_RAW) 1280 guess = SGILOGDATAFMT_UNKNOWN; 1281 break; 1282 default: 1283 guess = SGILOGDATAFMT_UNKNOWN; 1284 break; 1285 } 1286 return (guess); 1287} 1288 1289static int 1290LogLuvInitState(TIFF* tif) 1291{ 1292 TIFFDirectory* td = &tif->tif_dir; 1293 LogLuvState* sp = DecoderState(tif); 1294 static const char module[] = "LogLuvInitState"; 1295 1296 assert(sp != NULL); 1297 assert(td->td_photometric == PHOTOMETRIC_LOGLUV); 1298 1299 /* for some reason, we can't do this in TIFFInitLogLuv */ 1300 if (td->td_planarconfig != PLANARCONFIG_CONTIG) { 1301 TIFFError(module, 1302 "SGILog compression cannot handle non-contiguous data"); 1303 return (0); 1304 } 1305 if (sp->user_datafmt == SGILOGDATAFMT_UNKNOWN) 1306 sp->user_datafmt = LogLuvGuessDataFmt(td); 1307 switch (sp->user_datafmt) { 1308 case SGILOGDATAFMT_FLOAT: 1309 sp->pixel_size = 3*sizeof (float); 1310 break; 1311 case SGILOGDATAFMT_16BIT: 1312 sp->pixel_size = 3*sizeof (int16); 1313 break; 1314 case SGILOGDATAFMT_RAW: 1315 sp->pixel_size = sizeof (uint32); 1316 break; 1317 case SGILOGDATAFMT_8BIT: 1318 sp->pixel_size = 3*sizeof (uint8); 1319 break; 1320 default: 1321 TIFFError(tif->tif_name, 1322 "No support for converting user data format to LogLuv"); 1323 return (0); 1324 } 1325 sp->tbuflen = td->td_imagewidth * td->td_rowsperstrip; 1326 sp->tbuf = (tidata_t*) _TIFFmalloc(tif, sp->tbuflen * sizeof (uint32)); 1327 if (sp->tbuf == NULL) { 1328 TIFFError(module, "%s: No space for SGILog translation buffer", 1329 tif->tif_name); 1330 return (0); 1331 } 1332 return (1); 1333} 1334 1335static int 1336LogLuvSetupDecode(TIFF* tif) 1337{ 1338 LogLuvState* sp = DecoderState(tif); 1339 TIFFDirectory* td = &tif->tif_dir; 1340 1341 tif->tif_postdecode = _TIFFNoPostDecode; 1342 switch (td->td_photometric) { 1343 case PHOTOMETRIC_LOGLUV: 1344 if (!LogLuvInitState(tif)) 1345 break; 1346 if (td->td_compression == COMPRESSION_SGILOG24) { 1347 tif->tif_decoderow = LogLuvDecode24; 1348 switch (sp->user_datafmt) { 1349 case SGILOGDATAFMT_FLOAT: 1350 sp->tfunc = Luv24toXYZ; 1351 break; 1352 case SGILOGDATAFMT_16BIT: 1353 sp->tfunc = Luv24toLuv48; 1354 break; 1355 case SGILOGDATAFMT_8BIT: 1356 sp->tfunc = Luv24toRGB; 1357 break; 1358 } 1359 } else { 1360 tif->tif_decoderow = LogLuvDecode32; 1361 switch (sp->user_datafmt) { 1362 case SGILOGDATAFMT_FLOAT: 1363 sp->tfunc = Luv32toXYZ; 1364 break; 1365 case SGILOGDATAFMT_16BIT: 1366 sp->tfunc = Luv32toLuv48; 1367 break; 1368 case SGILOGDATAFMT_8BIT: 1369 sp->tfunc = Luv32toRGB; 1370 break; 1371 } 1372 } 1373 return (1); 1374 case PHOTOMETRIC_LOGL: 1375 if (!LogL16InitState(tif)) 1376 break; 1377 tif->tif_decoderow = LogL16Decode; 1378 switch (sp->user_datafmt) { 1379 case SGILOGDATAFMT_FLOAT: 1380 sp->tfunc = L16toY; 1381 break; 1382 case SGILOGDATAFMT_8BIT: 1383 sp->tfunc = L16toGry; 1384 break; 1385 } 1386 return (1); 1387 default: 1388 TIFFError(tif->tif_name, 1389 "Inappropriate photometric interpretation %d for SGILog compression; %s", 1390 td->td_photometric, "must be either LogLUV or LogL"); 1391 break; 1392 } 1393 return (0); 1394} 1395 1396#ifdef PDFLIB_TIFFWRITE_SUPPORT 1397static int 1398LogLuvSetupEncode(TIFF* tif) 1399{ 1400 LogLuvState* sp = EncoderState(tif); 1401 TIFFDirectory* td = &tif->tif_dir; 1402 1403 switch (td->td_photometric) { 1404 case PHOTOMETRIC_LOGLUV: 1405 if (!LogLuvInitState(tif)) 1406 break; 1407 if (td->td_compression == COMPRESSION_SGILOG24) { 1408 tif->tif_encoderow = LogLuvEncode24; 1409 switch (sp->user_datafmt) { 1410 case SGILOGDATAFMT_FLOAT: 1411 sp->tfunc = Luv24fromXYZ; 1412 break; 1413 case SGILOGDATAFMT_16BIT: 1414 sp->tfunc = Luv24fromLuv48; 1415 break; 1416 case SGILOGDATAFMT_RAW: 1417 break; 1418 default: 1419 goto notsupported; 1420 } 1421 } else { 1422 tif->tif_encoderow = LogLuvEncode32; 1423 switch (sp->user_datafmt) { 1424 case SGILOGDATAFMT_FLOAT: 1425 sp->tfunc = Luv32fromXYZ; 1426 break; 1427 case SGILOGDATAFMT_16BIT: 1428 sp->tfunc = Luv32fromLuv48; 1429 break; 1430 case SGILOGDATAFMT_RAW: 1431 break; 1432 default: 1433 goto notsupported; 1434 } 1435 } 1436 break; 1437 case PHOTOMETRIC_LOGL: 1438 if (!LogL16InitState(tif)) 1439 break; 1440 tif->tif_encoderow = LogL16Encode; 1441 switch (sp->user_datafmt) { 1442 case SGILOGDATAFMT_FLOAT: 1443 sp->tfunc = L16fromY; 1444 break; 1445 case SGILOGDATAFMT_16BIT: 1446 break; 1447 default: 1448 goto notsupported; 1449 } 1450 break; 1451 default: 1452 TIFFError(tif->tif_name, 1453 "Inappropriate photometric interpretation %d for SGILog compression; %s", 1454 td->td_photometric, "must be either LogLUV or LogL"); 1455 break; 1456 } 1457 return (1); 1458notsupported: 1459 TIFFError(tif->tif_name, 1460 "SGILog compression supported only for %s, or raw data", 1461 td->td_photometric == PHOTOMETRIC_LOGL ? "Y, L" : "XYZ, Luv"); 1462 return (0); 1463} 1464#endif /* PDFLIB_TIFFWRITE_SUPPORT */ 1465 1466#ifdef PDFLIB_TIFFWRITE_SUPPORT 1467static void 1468LogLuvClose(TIFF* tif) 1469{ 1470 TIFFDirectory *td = &tif->tif_dir; 1471 1472 /* 1473 * For consistency, we always want to write out the same 1474 * bitspersample and sampleformat for our TIFF file, 1475 * regardless of the data format being used by the application. 1476 * Since this routine is called after tags have been set but 1477 * before they have been recorded in the file, we reset them here. 1478 */ 1479 td->td_samplesperpixel = 1480 (td->td_photometric == PHOTOMETRIC_LOGL) ? 1 : 3; 1481 td->td_bitspersample = 16; 1482 td->td_sampleformat = SAMPLEFORMAT_INT; 1483} 1484#endif /* PDFLIB_TIFFWRITE_SUPPORT */ 1485 1486static void 1487LogLuvCleanup(TIFF* tif) 1488{ 1489 LogLuvState* sp = (LogLuvState *)tif->tif_data; 1490 1491 if (sp) { 1492 if (sp->tbuf) 1493 _TIFFfree(tif, sp->tbuf); 1494 _TIFFfree(tif, sp); 1495 tif->tif_data = NULL; 1496 } 1497} 1498 1499static int 1500LogLuvVSetField(TIFF* tif, ttag_t tag, va_list ap) 1501{ 1502 LogLuvState* sp = DecoderState(tif); 1503 int bps, fmt; 1504 1505 switch (tag) { 1506 case TIFFTAG_SGILOGDATAFMT: 1507 sp->user_datafmt = va_arg(ap, int); 1508 /* 1509 * Tweak the TIFF header so that the rest of libtiff knows what 1510 * size of data will be passed between app and library, and 1511 * assume that the app knows what it is doing and is not 1512 * confused by these header manipulations... 1513 */ 1514 switch (sp->user_datafmt) { 1515 case SGILOGDATAFMT_FLOAT: 1516 bps = 32, fmt = SAMPLEFORMAT_IEEEFP; 1517 break; 1518 case SGILOGDATAFMT_16BIT: 1519 bps = 16, fmt = SAMPLEFORMAT_INT; 1520 break; 1521 case SGILOGDATAFMT_RAW: 1522 bps = 32, fmt = SAMPLEFORMAT_UINT; 1523 TIFFSetField(tif, TIFFTAG_SAMPLESPERPIXEL, 1); 1524 break; 1525 case SGILOGDATAFMT_8BIT: 1526 bps = 8, fmt = SAMPLEFORMAT_UINT; 1527 break; 1528 default: 1529 TIFFError(tif->tif_name, 1530 "Unknown data format %d for LogLuv compression", 1531 sp->user_datafmt); 1532 return (0); 1533 } 1534 TIFFSetField(tif, TIFFTAG_BITSPERSAMPLE, bps); 1535 TIFFSetField(tif, TIFFTAG_SAMPLEFORMAT, fmt); 1536 /* 1537 * Must recalculate sizes should bits/sample change. 1538 */ 1539 tif->tif_tilesize = TIFFTileSize(tif); 1540 tif->tif_scanlinesize = TIFFScanlineSize(tif); 1541 return (1); 1542 case TIFFTAG_SGILOGENCODE: 1543 sp->encode_meth = va_arg(ap, int); 1544 if (sp->encode_meth != SGILOGENCODE_NODITHER && 1545 sp->encode_meth != SGILOGENCODE_RANDITHER) { 1546 TIFFError(tif->tif_name, 1547 "Unknown encoding %d for LogLuv compression", 1548 sp->encode_meth); 1549 return (0); 1550 } 1551 return (1); 1552 default: 1553 return (*sp->vsetparent)(tif, tag, ap); 1554 } 1555} 1556 1557static int 1558LogLuvVGetField(TIFF* tif, ttag_t tag, va_list ap) 1559{ 1560 LogLuvState *sp = (LogLuvState *)tif->tif_data; 1561 1562 switch (tag) { 1563 case TIFFTAG_SGILOGDATAFMT: 1564 *va_arg(ap, int*) = sp->user_datafmt; 1565 return (1); 1566 default: 1567 return (*sp->vgetparent)(tif, tag, ap); 1568 } 1569} 1570 1571static const TIFFFieldInfo LogLuvFieldInfo[] = { 1572 { TIFFTAG_SGILOGDATAFMT, 0, 0, TIFF_SHORT, FIELD_PSEUDO, 1573 TRUE, FALSE, "SGILogDataFmt"}, 1574 { TIFFTAG_SGILOGENCODE, 0, 0, TIFF_SHORT, FIELD_PSEUDO, 1575 TRUE, FALSE, "SGILogEncode"} 1576}; 1577 1578int 1579TIFFInitSGILog(TIFF* tif, int scheme) 1580{ 1581 static const char module[] = "TIFFInitSGILog"; 1582 LogLuvState* sp; 1583 1584 assert(scheme == COMPRESSION_SGILOG24 || scheme == COMPRESSION_SGILOG); 1585 1586 /* 1587 * Allocate state block so tag methods have storage to record values. 1588 */ 1589 tif->tif_data = (tidata_t) _TIFFmalloc(tif, sizeof (LogLuvState)); 1590 if (tif->tif_data == NULL) 1591 goto bad; 1592 sp = (LogLuvState*) tif->tif_data; 1593 _TIFFmemset((tdata_t)sp, 0, sizeof (*sp)); 1594 sp->user_datafmt = SGILOGDATAFMT_UNKNOWN; 1595 sp->encode_meth = (scheme == COMPRESSION_SGILOG24) ? 1596 SGILOGENCODE_RANDITHER : SGILOGENCODE_NODITHER; 1597 sp->tfunc = _logLuvNop; 1598 1599 /* 1600 * Install codec methods. 1601 * NB: tif_decoderow & tif_encoderow are filled 1602 * in at setup time. 1603 */ 1604 tif->tif_setupdecode = LogLuvSetupDecode; 1605 tif->tif_decodestrip = LogLuvDecodeStrip; 1606 tif->tif_decodetile = LogLuvDecodeTile; 1607#ifdef PDFLIB_TIFFWRITE_SUPPORT 1608 tif->tif_setupencode = LogLuvSetupEncode; 1609 tif->tif_encodestrip = LogLuvEncodeStrip; 1610 tif->tif_encodetile = LogLuvEncodeTile; 1611 tif->tif_close = LogLuvClose; 1612#endif /* PDFLIB_TIFFWRITE_SUPPORT */ 1613 tif->tif_cleanup = LogLuvCleanup; 1614 1615 /* override SetField so we can handle our private pseudo-tag */ 1616 _TIFFMergeFieldInfo(tif, LogLuvFieldInfo, N(LogLuvFieldInfo)); 1617 sp->vgetparent = tif->tif_vgetfield; 1618 tif->tif_vgetfield = LogLuvVGetField; /* hook for codec tags */ 1619 sp->vsetparent = tif->tif_vsetfield; 1620 tif->tif_vsetfield = LogLuvVSetField; /* hook for codec tags */ 1621 1622 return (1); 1623bad: 1624 TIFFError(module, "%s: No space for LogLuv state block", tif->tif_name); 1625 return (0); 1626} 1627#endif /* LOGLUV_SUPPORT */ 1628